2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
33 * Standards documents from:
34 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
35 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
36 * http://www.sata-io.org (SATA)
37 * http://www.compactflash.org (CF)
38 * http://www.qic.org (QIC157 - Tape and DSC)
39 * http://www.ce-ata.org (CE-ATA: not supported)
43 #include <linux/kernel.h>
44 #include <linux/module.h>
45 #include <linux/pci.h>
46 #include <linux/init.h>
47 #include <linux/list.h>
49 #include <linux/highmem.h>
50 #include <linux/spinlock.h>
51 #include <linux/blkdev.h>
52 #include <linux/delay.h>
53 #include <linux/timer.h>
54 #include <linux/interrupt.h>
55 #include <linux/completion.h>
56 #include <linux/suspend.h>
57 #include <linux/workqueue.h>
58 #include <linux/jiffies.h>
59 #include <linux/scatterlist.h>
61 #include <scsi/scsi.h>
62 #include <scsi/scsi_cmnd.h>
63 #include <scsi/scsi_host.h>
64 #include <linux/libata.h>
65 #include <asm/semaphore.h>
66 #include <asm/byteorder.h>
67 #include <linux/cdrom.h>
72 /* debounce timing parameters in msecs { interval, duration, timeout } */
73 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
74 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
75 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
77 static unsigned int ata_dev_init_params(struct ata_device *dev,
78 u16 heads, u16 sectors);
79 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
80 static unsigned int ata_dev_set_feature(struct ata_device *dev,
81 u8 enable, u8 feature);
82 static void ata_dev_xfermask(struct ata_device *dev);
83 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
85 unsigned int ata_print_id = 1;
86 static struct workqueue_struct *ata_wq;
88 struct workqueue_struct *ata_aux_wq;
90 int atapi_enabled = 1;
91 module_param(atapi_enabled, int, 0444);
92 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
95 module_param(atapi_dmadir, int, 0444);
96 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
98 int atapi_passthru16 = 1;
99 module_param(atapi_passthru16, int, 0444);
100 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
103 module_param_named(fua, libata_fua, int, 0444);
104 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
106 static int ata_ignore_hpa;
107 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
108 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
110 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
111 module_param_named(dma, libata_dma_mask, int, 0444);
112 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
114 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
115 module_param(ata_probe_timeout, int, 0444);
116 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
118 int libata_noacpi = 0;
119 module_param_named(noacpi, libata_noacpi, int, 0444);
120 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
122 int libata_allow_tpm = 0;
123 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
124 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
126 MODULE_AUTHOR("Jeff Garzik");
127 MODULE_DESCRIPTION("Library module for ATA devices");
128 MODULE_LICENSE("GPL");
129 MODULE_VERSION(DRV_VERSION);
133 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
134 * @tf: Taskfile to convert
135 * @pmp: Port multiplier port
136 * @is_cmd: This FIS is for command
137 * @fis: Buffer into which data will output
139 * Converts a standard ATA taskfile to a Serial ATA
140 * FIS structure (Register - Host to Device).
143 * Inherited from caller.
145 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
147 fis[0] = 0x27; /* Register - Host to Device FIS */
148 fis[1] = pmp & 0xf; /* Port multiplier number*/
150 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
152 fis[2] = tf->command;
153 fis[3] = tf->feature;
160 fis[8] = tf->hob_lbal;
161 fis[9] = tf->hob_lbam;
162 fis[10] = tf->hob_lbah;
163 fis[11] = tf->hob_feature;
166 fis[13] = tf->hob_nsect;
177 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
178 * @fis: Buffer from which data will be input
179 * @tf: Taskfile to output
181 * Converts a serial ATA FIS structure to a standard ATA taskfile.
184 * Inherited from caller.
187 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
189 tf->command = fis[2]; /* status */
190 tf->feature = fis[3]; /* error */
197 tf->hob_lbal = fis[8];
198 tf->hob_lbam = fis[9];
199 tf->hob_lbah = fis[10];
202 tf->hob_nsect = fis[13];
205 static const u8 ata_rw_cmds[] = {
209 ATA_CMD_READ_MULTI_EXT,
210 ATA_CMD_WRITE_MULTI_EXT,
214 ATA_CMD_WRITE_MULTI_FUA_EXT,
218 ATA_CMD_PIO_READ_EXT,
219 ATA_CMD_PIO_WRITE_EXT,
232 ATA_CMD_WRITE_FUA_EXT
236 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
237 * @tf: command to examine and configure
238 * @dev: device tf belongs to
240 * Examine the device configuration and tf->flags to calculate
241 * the proper read/write commands and protocol to use.
246 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
250 int index, fua, lba48, write;
252 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
253 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
254 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
256 if (dev->flags & ATA_DFLAG_PIO) {
257 tf->protocol = ATA_PROT_PIO;
258 index = dev->multi_count ? 0 : 8;
259 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
260 /* Unable to use DMA due to host limitation */
261 tf->protocol = ATA_PROT_PIO;
262 index = dev->multi_count ? 0 : 8;
264 tf->protocol = ATA_PROT_DMA;
268 cmd = ata_rw_cmds[index + fua + lba48 + write];
277 * ata_tf_read_block - Read block address from ATA taskfile
278 * @tf: ATA taskfile of interest
279 * @dev: ATA device @tf belongs to
284 * Read block address from @tf. This function can handle all
285 * three address formats - LBA, LBA48 and CHS. tf->protocol and
286 * flags select the address format to use.
289 * Block address read from @tf.
291 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
295 if (tf->flags & ATA_TFLAG_LBA) {
296 if (tf->flags & ATA_TFLAG_LBA48) {
297 block |= (u64)tf->hob_lbah << 40;
298 block |= (u64)tf->hob_lbam << 32;
299 block |= tf->hob_lbal << 24;
301 block |= (tf->device & 0xf) << 24;
303 block |= tf->lbah << 16;
304 block |= tf->lbam << 8;
309 cyl = tf->lbam | (tf->lbah << 8);
310 head = tf->device & 0xf;
313 block = (cyl * dev->heads + head) * dev->sectors + sect;
320 * ata_build_rw_tf - Build ATA taskfile for given read/write request
321 * @tf: Target ATA taskfile
322 * @dev: ATA device @tf belongs to
323 * @block: Block address
324 * @n_block: Number of blocks
325 * @tf_flags: RW/FUA etc...
331 * Build ATA taskfile @tf for read/write request described by
332 * @block, @n_block, @tf_flags and @tag on @dev.
336 * 0 on success, -ERANGE if the request is too large for @dev,
337 * -EINVAL if the request is invalid.
339 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
340 u64 block, u32 n_block, unsigned int tf_flags,
343 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
344 tf->flags |= tf_flags;
346 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
348 if (!lba_48_ok(block, n_block))
351 tf->protocol = ATA_PROT_NCQ;
352 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
354 if (tf->flags & ATA_TFLAG_WRITE)
355 tf->command = ATA_CMD_FPDMA_WRITE;
357 tf->command = ATA_CMD_FPDMA_READ;
359 tf->nsect = tag << 3;
360 tf->hob_feature = (n_block >> 8) & 0xff;
361 tf->feature = n_block & 0xff;
363 tf->hob_lbah = (block >> 40) & 0xff;
364 tf->hob_lbam = (block >> 32) & 0xff;
365 tf->hob_lbal = (block >> 24) & 0xff;
366 tf->lbah = (block >> 16) & 0xff;
367 tf->lbam = (block >> 8) & 0xff;
368 tf->lbal = block & 0xff;
371 if (tf->flags & ATA_TFLAG_FUA)
372 tf->device |= 1 << 7;
373 } else if (dev->flags & ATA_DFLAG_LBA) {
374 tf->flags |= ATA_TFLAG_LBA;
376 if (lba_28_ok(block, n_block)) {
378 tf->device |= (block >> 24) & 0xf;
379 } else if (lba_48_ok(block, n_block)) {
380 if (!(dev->flags & ATA_DFLAG_LBA48))
384 tf->flags |= ATA_TFLAG_LBA48;
386 tf->hob_nsect = (n_block >> 8) & 0xff;
388 tf->hob_lbah = (block >> 40) & 0xff;
389 tf->hob_lbam = (block >> 32) & 0xff;
390 tf->hob_lbal = (block >> 24) & 0xff;
392 /* request too large even for LBA48 */
395 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
398 tf->nsect = n_block & 0xff;
400 tf->lbah = (block >> 16) & 0xff;
401 tf->lbam = (block >> 8) & 0xff;
402 tf->lbal = block & 0xff;
404 tf->device |= ATA_LBA;
407 u32 sect, head, cyl, track;
409 /* The request -may- be too large for CHS addressing. */
410 if (!lba_28_ok(block, n_block))
413 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
416 /* Convert LBA to CHS */
417 track = (u32)block / dev->sectors;
418 cyl = track / dev->heads;
419 head = track % dev->heads;
420 sect = (u32)block % dev->sectors + 1;
422 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
423 (u32)block, track, cyl, head, sect);
425 /* Check whether the converted CHS can fit.
429 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
432 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
443 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
444 * @pio_mask: pio_mask
445 * @mwdma_mask: mwdma_mask
446 * @udma_mask: udma_mask
448 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
449 * unsigned int xfer_mask.
457 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
458 unsigned int mwdma_mask,
459 unsigned int udma_mask)
461 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
462 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
463 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
467 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
468 * @xfer_mask: xfer_mask to unpack
469 * @pio_mask: resulting pio_mask
470 * @mwdma_mask: resulting mwdma_mask
471 * @udma_mask: resulting udma_mask
473 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
474 * Any NULL distination masks will be ignored.
476 static void ata_unpack_xfermask(unsigned int xfer_mask,
477 unsigned int *pio_mask,
478 unsigned int *mwdma_mask,
479 unsigned int *udma_mask)
482 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
484 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
486 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
489 static const struct ata_xfer_ent {
493 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
494 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
495 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
500 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
501 * @xfer_mask: xfer_mask of interest
503 * Return matching XFER_* value for @xfer_mask. Only the highest
504 * bit of @xfer_mask is considered.
510 * Matching XFER_* value, 0 if no match found.
512 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
514 int highbit = fls(xfer_mask) - 1;
515 const struct ata_xfer_ent *ent;
517 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
518 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
519 return ent->base + highbit - ent->shift;
524 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
525 * @xfer_mode: XFER_* of interest
527 * Return matching xfer_mask for @xfer_mode.
533 * Matching xfer_mask, 0 if no match found.
535 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
537 const struct ata_xfer_ent *ent;
539 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
540 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
541 return 1 << (ent->shift + xfer_mode - ent->base);
546 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
547 * @xfer_mode: XFER_* of interest
549 * Return matching xfer_shift for @xfer_mode.
555 * Matching xfer_shift, -1 if no match found.
557 static int ata_xfer_mode2shift(unsigned int xfer_mode)
559 const struct ata_xfer_ent *ent;
561 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
562 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
568 * ata_mode_string - convert xfer_mask to string
569 * @xfer_mask: mask of bits supported; only highest bit counts.
571 * Determine string which represents the highest speed
572 * (highest bit in @modemask).
578 * Constant C string representing highest speed listed in
579 * @mode_mask, or the constant C string "<n/a>".
581 static const char *ata_mode_string(unsigned int xfer_mask)
583 static const char * const xfer_mode_str[] = {
607 highbit = fls(xfer_mask) - 1;
608 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
609 return xfer_mode_str[highbit];
613 static const char *sata_spd_string(unsigned int spd)
615 static const char * const spd_str[] = {
620 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
622 return spd_str[spd - 1];
625 void ata_dev_disable(struct ata_device *dev)
627 if (ata_dev_enabled(dev)) {
628 if (ata_msg_drv(dev->link->ap))
629 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
630 ata_acpi_on_disable(dev);
631 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
637 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
639 struct ata_link *link = dev->link;
640 struct ata_port *ap = link->ap;
642 unsigned int err_mask;
646 * disallow DIPM for drivers which haven't set
647 * ATA_FLAG_IPM. This is because when DIPM is enabled,
648 * phy ready will be set in the interrupt status on
649 * state changes, which will cause some drivers to
650 * think there are errors - additionally drivers will
651 * need to disable hot plug.
653 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
654 ap->pm_policy = NOT_AVAILABLE;
659 * For DIPM, we will only enable it for the
662 * Why? Because Disks are too stupid to know that
663 * If the host rejects a request to go to SLUMBER
664 * they should retry at PARTIAL, and instead it
665 * just would give up. So, for medium_power to
666 * work at all, we need to only allow HIPM.
668 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
674 /* no restrictions on IPM transitions */
675 scontrol &= ~(0x3 << 8);
676 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
681 if (dev->flags & ATA_DFLAG_DIPM)
682 err_mask = ata_dev_set_feature(dev,
683 SETFEATURES_SATA_ENABLE, SATA_DIPM);
686 /* allow IPM to PARTIAL */
687 scontrol &= ~(0x1 << 8);
688 scontrol |= (0x2 << 8);
689 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
694 * we don't have to disable DIPM since IPM flags
695 * disallow transitions to SLUMBER, which effectively
696 * disable DIPM if it does not support PARTIAL
700 case MAX_PERFORMANCE:
701 /* disable all IPM transitions */
702 scontrol |= (0x3 << 8);
703 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
708 * we don't have to disable DIPM since IPM flags
709 * disallow all transitions which effectively
710 * disable DIPM anyway.
715 /* FIXME: handle SET FEATURES failure */
722 * ata_dev_enable_pm - enable SATA interface power management
723 * @dev: device to enable power management
724 * @policy: the link power management policy
726 * Enable SATA Interface power management. This will enable
727 * Device Interface Power Management (DIPM) for min_power
728 * policy, and then call driver specific callbacks for
729 * enabling Host Initiated Power management.
732 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
734 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
737 struct ata_port *ap = dev->link->ap;
739 /* set HIPM first, then DIPM */
740 if (ap->ops->enable_pm)
741 rc = ap->ops->enable_pm(ap, policy);
744 rc = ata_dev_set_dipm(dev, policy);
748 ap->pm_policy = MAX_PERFORMANCE;
750 ap->pm_policy = policy;
751 return /* rc */; /* hopefully we can use 'rc' eventually */
756 * ata_dev_disable_pm - disable SATA interface power management
757 * @dev: device to disable power management
759 * Disable SATA Interface power management. This will disable
760 * Device Interface Power Management (DIPM) without changing
761 * policy, call driver specific callbacks for disabling Host
762 * Initiated Power management.
767 static void ata_dev_disable_pm(struct ata_device *dev)
769 struct ata_port *ap = dev->link->ap;
771 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
772 if (ap->ops->disable_pm)
773 ap->ops->disable_pm(ap);
775 #endif /* CONFIG_PM */
777 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
779 ap->pm_policy = policy;
780 ap->link.eh_info.action |= ATA_EHI_LPM;
781 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
782 ata_port_schedule_eh(ap);
786 static void ata_lpm_enable(struct ata_host *host)
788 struct ata_link *link;
790 struct ata_device *dev;
793 for (i = 0; i < host->n_ports; i++) {
795 ata_port_for_each_link(link, ap) {
796 ata_link_for_each_dev(dev, link)
797 ata_dev_disable_pm(dev);
802 static void ata_lpm_disable(struct ata_host *host)
806 for (i = 0; i < host->n_ports; i++) {
807 struct ata_port *ap = host->ports[i];
808 ata_lpm_schedule(ap, ap->pm_policy);
811 #endif /* CONFIG_PM */
815 * ata_devchk - PATA device presence detection
816 * @ap: ATA channel to examine
817 * @device: Device to examine (starting at zero)
819 * This technique was originally described in
820 * Hale Landis's ATADRVR (www.ata-atapi.com), and
821 * later found its way into the ATA/ATAPI spec.
823 * Write a pattern to the ATA shadow registers,
824 * and if a device is present, it will respond by
825 * correctly storing and echoing back the
826 * ATA shadow register contents.
832 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
834 struct ata_ioports *ioaddr = &ap->ioaddr;
837 ap->ops->dev_select(ap, device);
839 iowrite8(0x55, ioaddr->nsect_addr);
840 iowrite8(0xaa, ioaddr->lbal_addr);
842 iowrite8(0xaa, ioaddr->nsect_addr);
843 iowrite8(0x55, ioaddr->lbal_addr);
845 iowrite8(0x55, ioaddr->nsect_addr);
846 iowrite8(0xaa, ioaddr->lbal_addr);
848 nsect = ioread8(ioaddr->nsect_addr);
849 lbal = ioread8(ioaddr->lbal_addr);
851 if ((nsect == 0x55) && (lbal == 0xaa))
852 return 1; /* we found a device */
854 return 0; /* nothing found */
858 * ata_dev_classify - determine device type based on ATA-spec signature
859 * @tf: ATA taskfile register set for device to be identified
861 * Determine from taskfile register contents whether a device is
862 * ATA or ATAPI, as per "Signature and persistence" section
863 * of ATA/PI spec (volume 1, sect 5.14).
869 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
870 * %ATA_DEV_UNKNOWN the event of failure.
872 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
874 /* Apple's open source Darwin code hints that some devices only
875 * put a proper signature into the LBA mid/high registers,
876 * So, we only check those. It's sufficient for uniqueness.
878 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
879 * signatures for ATA and ATAPI devices attached on SerialATA,
880 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
881 * spec has never mentioned about using different signatures
882 * for ATA/ATAPI devices. Then, Serial ATA II: Port
883 * Multiplier specification began to use 0x69/0x96 to identify
884 * port multpliers and 0x3c/0xc3 to identify SEMB device.
885 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
886 * 0x69/0x96 shortly and described them as reserved for
889 * We follow the current spec and consider that 0x69/0x96
890 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
892 if ((tf->lbam == 0) && (tf->lbah == 0)) {
893 DPRINTK("found ATA device by sig\n");
897 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
898 DPRINTK("found ATAPI device by sig\n");
899 return ATA_DEV_ATAPI;
902 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
903 DPRINTK("found PMP device by sig\n");
907 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
908 printk(KERN_INFO "ata: SEMB device ignored\n");
909 return ATA_DEV_SEMB_UNSUP; /* not yet */
912 DPRINTK("unknown device\n");
913 return ATA_DEV_UNKNOWN;
917 * ata_dev_try_classify - Parse returned ATA device signature
918 * @dev: ATA device to classify (starting at zero)
919 * @present: device seems present
920 * @r_err: Value of error register on completion
922 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
923 * an ATA/ATAPI-defined set of values is placed in the ATA
924 * shadow registers, indicating the results of device detection
927 * Select the ATA device, and read the values from the ATA shadow
928 * registers. Then parse according to the Error register value,
929 * and the spec-defined values examined by ata_dev_classify().
935 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
937 unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
940 struct ata_port *ap = dev->link->ap;
941 struct ata_taskfile tf;
945 ap->ops->dev_select(ap, dev->devno);
947 memset(&tf, 0, sizeof(tf));
949 ap->ops->tf_read(ap, &tf);
954 /* see if device passed diags: if master then continue and warn later */
955 if (err == 0 && dev->devno == 0)
956 /* diagnostic fail : do nothing _YET_ */
957 dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
960 else if ((dev->devno == 0) && (err == 0x81))
965 /* determine if device is ATA or ATAPI */
966 class = ata_dev_classify(&tf);
968 if (class == ATA_DEV_UNKNOWN) {
969 /* If the device failed diagnostic, it's likely to
970 * have reported incorrect device signature too.
971 * Assume ATA device if the device seems present but
972 * device signature is invalid with diagnostic
975 if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
978 class = ATA_DEV_NONE;
979 } else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
980 class = ATA_DEV_NONE;
986 * ata_id_string - Convert IDENTIFY DEVICE page into string
987 * @id: IDENTIFY DEVICE results we will examine
988 * @s: string into which data is output
989 * @ofs: offset into identify device page
990 * @len: length of string to return. must be an even number.
992 * The strings in the IDENTIFY DEVICE page are broken up into
993 * 16-bit chunks. Run through the string, and output each
994 * 8-bit chunk linearly, regardless of platform.
1000 void ata_id_string(const u16 *id, unsigned char *s,
1001 unsigned int ofs, unsigned int len)
1020 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1021 * @id: IDENTIFY DEVICE results we will examine
1022 * @s: string into which data is output
1023 * @ofs: offset into identify device page
1024 * @len: length of string to return. must be an odd number.
1026 * This function is identical to ata_id_string except that it
1027 * trims trailing spaces and terminates the resulting string with
1028 * null. @len must be actual maximum length (even number) + 1.
1033 void ata_id_c_string(const u16 *id, unsigned char *s,
1034 unsigned int ofs, unsigned int len)
1038 WARN_ON(!(len & 1));
1040 ata_id_string(id, s, ofs, len - 1);
1042 p = s + strnlen(s, len - 1);
1043 while (p > s && p[-1] == ' ')
1048 static u64 ata_id_n_sectors(const u16 *id)
1050 if (ata_id_has_lba(id)) {
1051 if (ata_id_has_lba48(id))
1052 return ata_id_u64(id, 100);
1054 return ata_id_u32(id, 60);
1056 if (ata_id_current_chs_valid(id))
1057 return ata_id_u32(id, 57);
1059 return id[1] * id[3] * id[6];
1063 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
1067 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1068 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1069 sectors |= (tf->hob_lbal & 0xff) << 24;
1070 sectors |= (tf->lbah & 0xff) << 16;
1071 sectors |= (tf->lbam & 0xff) << 8;
1072 sectors |= (tf->lbal & 0xff);
1077 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
1081 sectors |= (tf->device & 0x0f) << 24;
1082 sectors |= (tf->lbah & 0xff) << 16;
1083 sectors |= (tf->lbam & 0xff) << 8;
1084 sectors |= (tf->lbal & 0xff);
1090 * ata_read_native_max_address - Read native max address
1091 * @dev: target device
1092 * @max_sectors: out parameter for the result native max address
1094 * Perform an LBA48 or LBA28 native size query upon the device in
1098 * 0 on success, -EACCES if command is aborted by the drive.
1099 * -EIO on other errors.
1101 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1103 unsigned int err_mask;
1104 struct ata_taskfile tf;
1105 int lba48 = ata_id_has_lba48(dev->id);
1107 ata_tf_init(dev, &tf);
1109 /* always clear all address registers */
1110 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1113 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1114 tf.flags |= ATA_TFLAG_LBA48;
1116 tf.command = ATA_CMD_READ_NATIVE_MAX;
1118 tf.protocol |= ATA_PROT_NODATA;
1119 tf.device |= ATA_LBA;
1121 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1123 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1124 "max address (err_mask=0x%x)\n", err_mask);
1125 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1131 *max_sectors = ata_tf_to_lba48(&tf);
1133 *max_sectors = ata_tf_to_lba(&tf);
1134 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1140 * ata_set_max_sectors - Set max sectors
1141 * @dev: target device
1142 * @new_sectors: new max sectors value to set for the device
1144 * Set max sectors of @dev to @new_sectors.
1147 * 0 on success, -EACCES if command is aborted or denied (due to
1148 * previous non-volatile SET_MAX) by the drive. -EIO on other
1151 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1153 unsigned int err_mask;
1154 struct ata_taskfile tf;
1155 int lba48 = ata_id_has_lba48(dev->id);
1159 ata_tf_init(dev, &tf);
1161 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1164 tf.command = ATA_CMD_SET_MAX_EXT;
1165 tf.flags |= ATA_TFLAG_LBA48;
1167 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1168 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1169 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1171 tf.command = ATA_CMD_SET_MAX;
1173 tf.device |= (new_sectors >> 24) & 0xf;
1176 tf.protocol |= ATA_PROT_NODATA;
1177 tf.device |= ATA_LBA;
1179 tf.lbal = (new_sectors >> 0) & 0xff;
1180 tf.lbam = (new_sectors >> 8) & 0xff;
1181 tf.lbah = (new_sectors >> 16) & 0xff;
1183 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1185 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1186 "max address (err_mask=0x%x)\n", err_mask);
1187 if (err_mask == AC_ERR_DEV &&
1188 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1197 * ata_hpa_resize - Resize a device with an HPA set
1198 * @dev: Device to resize
1200 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1201 * it if required to the full size of the media. The caller must check
1202 * the drive has the HPA feature set enabled.
1205 * 0 on success, -errno on failure.
1207 static int ata_hpa_resize(struct ata_device *dev)
1209 struct ata_eh_context *ehc = &dev->link->eh_context;
1210 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1211 u64 sectors = ata_id_n_sectors(dev->id);
1215 /* do we need to do it? */
1216 if (dev->class != ATA_DEV_ATA ||
1217 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1218 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1221 /* read native max address */
1222 rc = ata_read_native_max_address(dev, &native_sectors);
1224 /* If HPA isn't going to be unlocked, skip HPA
1225 * resizing from the next try.
1227 if (!ata_ignore_hpa) {
1228 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1229 "broken, will skip HPA handling\n");
1230 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1232 /* we can continue if device aborted the command */
1240 /* nothing to do? */
1241 if (native_sectors <= sectors || !ata_ignore_hpa) {
1242 if (!print_info || native_sectors == sectors)
1245 if (native_sectors > sectors)
1246 ata_dev_printk(dev, KERN_INFO,
1247 "HPA detected: current %llu, native %llu\n",
1248 (unsigned long long)sectors,
1249 (unsigned long long)native_sectors);
1250 else if (native_sectors < sectors)
1251 ata_dev_printk(dev, KERN_WARNING,
1252 "native sectors (%llu) is smaller than "
1254 (unsigned long long)native_sectors,
1255 (unsigned long long)sectors);
1259 /* let's unlock HPA */
1260 rc = ata_set_max_sectors(dev, native_sectors);
1261 if (rc == -EACCES) {
1262 /* if device aborted the command, skip HPA resizing */
1263 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1264 "(%llu -> %llu), skipping HPA handling\n",
1265 (unsigned long long)sectors,
1266 (unsigned long long)native_sectors);
1267 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1272 /* re-read IDENTIFY data */
1273 rc = ata_dev_reread_id(dev, 0);
1275 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1276 "data after HPA resizing\n");
1281 u64 new_sectors = ata_id_n_sectors(dev->id);
1282 ata_dev_printk(dev, KERN_INFO,
1283 "HPA unlocked: %llu -> %llu, native %llu\n",
1284 (unsigned long long)sectors,
1285 (unsigned long long)new_sectors,
1286 (unsigned long long)native_sectors);
1293 * ata_id_to_dma_mode - Identify DMA mode from id block
1294 * @dev: device to identify
1295 * @unknown: mode to assume if we cannot tell
1297 * Set up the timing values for the device based upon the identify
1298 * reported values for the DMA mode. This function is used by drivers
1299 * which rely upon firmware configured modes, but wish to report the
1300 * mode correctly when possible.
1302 * In addition we emit similarly formatted messages to the default
1303 * ata_dev_set_mode handler, in order to provide consistency of
1307 void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
1312 /* Pack the DMA modes */
1313 mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
1314 if (dev->id[53] & 0x04)
1315 mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
1317 /* Select the mode in use */
1318 mode = ata_xfer_mask2mode(mask);
1321 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1322 ata_mode_string(mask));
1324 /* SWDMA perhaps ? */
1326 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
1329 /* Configure the device reporting */
1330 dev->xfer_mode = mode;
1331 dev->xfer_shift = ata_xfer_mode2shift(mode);
1335 * ata_noop_dev_select - Select device 0/1 on ATA bus
1336 * @ap: ATA channel to manipulate
1337 * @device: ATA device (numbered from zero) to select
1339 * This function performs no actual function.
1341 * May be used as the dev_select() entry in ata_port_operations.
1346 void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
1352 * ata_std_dev_select - Select device 0/1 on ATA bus
1353 * @ap: ATA channel to manipulate
1354 * @device: ATA device (numbered from zero) to select
1356 * Use the method defined in the ATA specification to
1357 * make either device 0, or device 1, active on the
1358 * ATA channel. Works with both PIO and MMIO.
1360 * May be used as the dev_select() entry in ata_port_operations.
1366 void ata_std_dev_select(struct ata_port *ap, unsigned int device)
1371 tmp = ATA_DEVICE_OBS;
1373 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1375 iowrite8(tmp, ap->ioaddr.device_addr);
1376 ata_pause(ap); /* needed; also flushes, for mmio */
1380 * ata_dev_select - Select device 0/1 on ATA bus
1381 * @ap: ATA channel to manipulate
1382 * @device: ATA device (numbered from zero) to select
1383 * @wait: non-zero to wait for Status register BSY bit to clear
1384 * @can_sleep: non-zero if context allows sleeping
1386 * Use the method defined in the ATA specification to
1387 * make either device 0, or device 1, active on the
1390 * This is a high-level version of ata_std_dev_select(),
1391 * which additionally provides the services of inserting
1392 * the proper pauses and status polling, where needed.
1398 void ata_dev_select(struct ata_port *ap, unsigned int device,
1399 unsigned int wait, unsigned int can_sleep)
1401 if (ata_msg_probe(ap))
1402 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1403 "device %u, wait %u\n", device, wait);
1408 ap->ops->dev_select(ap, device);
1411 if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
1418 * ata_dump_id - IDENTIFY DEVICE info debugging output
1419 * @id: IDENTIFY DEVICE page to dump
1421 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1428 static inline void ata_dump_id(const u16 *id)
1430 DPRINTK("49==0x%04x "
1440 DPRINTK("80==0x%04x "
1450 DPRINTK("88==0x%04x "
1457 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1458 * @id: IDENTIFY data to compute xfer mask from
1460 * Compute the xfermask for this device. This is not as trivial
1461 * as it seems if we must consider early devices correctly.
1463 * FIXME: pre IDE drive timing (do we care ?).
1471 static unsigned int ata_id_xfermask(const u16 *id)
1473 unsigned int pio_mask, mwdma_mask, udma_mask;
1475 /* Usual case. Word 53 indicates word 64 is valid */
1476 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1477 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1481 /* If word 64 isn't valid then Word 51 high byte holds
1482 * the PIO timing number for the maximum. Turn it into
1485 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1486 if (mode < 5) /* Valid PIO range */
1487 pio_mask = (2 << mode) - 1;
1491 /* But wait.. there's more. Design your standards by
1492 * committee and you too can get a free iordy field to
1493 * process. However its the speeds not the modes that
1494 * are supported... Note drivers using the timing API
1495 * will get this right anyway
1499 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1501 if (ata_id_is_cfa(id)) {
1503 * Process compact flash extended modes
1505 int pio = id[163] & 0x7;
1506 int dma = (id[163] >> 3) & 7;
1509 pio_mask |= (1 << 5);
1511 pio_mask |= (1 << 6);
1513 mwdma_mask |= (1 << 3);
1515 mwdma_mask |= (1 << 4);
1519 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1520 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1522 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1526 * ata_port_queue_task - Queue port_task
1527 * @ap: The ata_port to queue port_task for
1528 * @fn: workqueue function to be scheduled
1529 * @data: data for @fn to use
1530 * @delay: delay time for workqueue function
1532 * Schedule @fn(@data) for execution after @delay jiffies using
1533 * port_task. There is one port_task per port and it's the
1534 * user(low level driver)'s responsibility to make sure that only
1535 * one task is active at any given time.
1537 * libata core layer takes care of synchronization between
1538 * port_task and EH. ata_port_queue_task() may be ignored for EH
1542 * Inherited from caller.
1544 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1545 unsigned long delay)
1547 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1548 ap->port_task_data = data;
1550 /* may fail if ata_port_flush_task() in progress */
1551 queue_delayed_work(ata_wq, &ap->port_task, delay);
1555 * ata_port_flush_task - Flush port_task
1556 * @ap: The ata_port to flush port_task for
1558 * After this function completes, port_task is guranteed not to
1559 * be running or scheduled.
1562 * Kernel thread context (may sleep)
1564 void ata_port_flush_task(struct ata_port *ap)
1568 cancel_rearming_delayed_work(&ap->port_task);
1570 if (ata_msg_ctl(ap))
1571 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1574 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1576 struct completion *waiting = qc->private_data;
1582 * ata_exec_internal_sg - execute libata internal command
1583 * @dev: Device to which the command is sent
1584 * @tf: Taskfile registers for the command and the result
1585 * @cdb: CDB for packet command
1586 * @dma_dir: Data tranfer direction of the command
1587 * @sgl: sg list for the data buffer of the command
1588 * @n_elem: Number of sg entries
1589 * @timeout: Timeout in msecs (0 for default)
1591 * Executes libata internal command with timeout. @tf contains
1592 * command on entry and result on return. Timeout and error
1593 * conditions are reported via return value. No recovery action
1594 * is taken after a command times out. It's caller's duty to
1595 * clean up after timeout.
1598 * None. Should be called with kernel context, might sleep.
1601 * Zero on success, AC_ERR_* mask on failure
1603 unsigned ata_exec_internal_sg(struct ata_device *dev,
1604 struct ata_taskfile *tf, const u8 *cdb,
1605 int dma_dir, struct scatterlist *sgl,
1606 unsigned int n_elem, unsigned long timeout)
1608 struct ata_link *link = dev->link;
1609 struct ata_port *ap = link->ap;
1610 u8 command = tf->command;
1611 struct ata_queued_cmd *qc;
1612 unsigned int tag, preempted_tag;
1613 u32 preempted_sactive, preempted_qc_active;
1614 int preempted_nr_active_links;
1615 DECLARE_COMPLETION_ONSTACK(wait);
1616 unsigned long flags;
1617 unsigned int err_mask;
1620 spin_lock_irqsave(ap->lock, flags);
1622 /* no internal command while frozen */
1623 if (ap->pflags & ATA_PFLAG_FROZEN) {
1624 spin_unlock_irqrestore(ap->lock, flags);
1625 return AC_ERR_SYSTEM;
1628 /* initialize internal qc */
1630 /* XXX: Tag 0 is used for drivers with legacy EH as some
1631 * drivers choke if any other tag is given. This breaks
1632 * ata_tag_internal() test for those drivers. Don't use new
1633 * EH stuff without converting to it.
1635 if (ap->ops->error_handler)
1636 tag = ATA_TAG_INTERNAL;
1640 if (test_and_set_bit(tag, &ap->qc_allocated))
1642 qc = __ata_qc_from_tag(ap, tag);
1650 preempted_tag = link->active_tag;
1651 preempted_sactive = link->sactive;
1652 preempted_qc_active = ap->qc_active;
1653 preempted_nr_active_links = ap->nr_active_links;
1654 link->active_tag = ATA_TAG_POISON;
1657 ap->nr_active_links = 0;
1659 /* prepare & issue qc */
1662 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1663 qc->flags |= ATA_QCFLAG_RESULT_TF;
1664 qc->dma_dir = dma_dir;
1665 if (dma_dir != DMA_NONE) {
1666 unsigned int i, buflen = 0;
1667 struct scatterlist *sg;
1669 for_each_sg(sgl, sg, n_elem, i)
1670 buflen += sg->length;
1672 ata_sg_init(qc, sgl, n_elem);
1673 qc->nbytes = buflen;
1676 qc->private_data = &wait;
1677 qc->complete_fn = ata_qc_complete_internal;
1681 spin_unlock_irqrestore(ap->lock, flags);
1684 timeout = ata_probe_timeout * 1000 / HZ;
1686 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1688 ata_port_flush_task(ap);
1691 spin_lock_irqsave(ap->lock, flags);
1693 /* We're racing with irq here. If we lose, the
1694 * following test prevents us from completing the qc
1695 * twice. If we win, the port is frozen and will be
1696 * cleaned up by ->post_internal_cmd().
1698 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1699 qc->err_mask |= AC_ERR_TIMEOUT;
1701 if (ap->ops->error_handler)
1702 ata_port_freeze(ap);
1704 ata_qc_complete(qc);
1706 if (ata_msg_warn(ap))
1707 ata_dev_printk(dev, KERN_WARNING,
1708 "qc timeout (cmd 0x%x)\n", command);
1711 spin_unlock_irqrestore(ap->lock, flags);
1714 /* do post_internal_cmd */
1715 if (ap->ops->post_internal_cmd)
1716 ap->ops->post_internal_cmd(qc);
1718 /* perform minimal error analysis */
1719 if (qc->flags & ATA_QCFLAG_FAILED) {
1720 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1721 qc->err_mask |= AC_ERR_DEV;
1724 qc->err_mask |= AC_ERR_OTHER;
1726 if (qc->err_mask & ~AC_ERR_OTHER)
1727 qc->err_mask &= ~AC_ERR_OTHER;
1731 spin_lock_irqsave(ap->lock, flags);
1733 *tf = qc->result_tf;
1734 err_mask = qc->err_mask;
1737 link->active_tag = preempted_tag;
1738 link->sactive = preempted_sactive;
1739 ap->qc_active = preempted_qc_active;
1740 ap->nr_active_links = preempted_nr_active_links;
1742 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1743 * Until those drivers are fixed, we detect the condition
1744 * here, fail the command with AC_ERR_SYSTEM and reenable the
1747 * Note that this doesn't change any behavior as internal
1748 * command failure results in disabling the device in the
1749 * higher layer for LLDDs without new reset/EH callbacks.
1751 * Kill the following code as soon as those drivers are fixed.
1753 if (ap->flags & ATA_FLAG_DISABLED) {
1754 err_mask |= AC_ERR_SYSTEM;
1758 spin_unlock_irqrestore(ap->lock, flags);
1764 * ata_exec_internal - execute libata internal command
1765 * @dev: Device to which the command is sent
1766 * @tf: Taskfile registers for the command and the result
1767 * @cdb: CDB for packet command
1768 * @dma_dir: Data tranfer direction of the command
1769 * @buf: Data buffer of the command
1770 * @buflen: Length of data buffer
1771 * @timeout: Timeout in msecs (0 for default)
1773 * Wrapper around ata_exec_internal_sg() which takes simple
1774 * buffer instead of sg list.
1777 * None. Should be called with kernel context, might sleep.
1780 * Zero on success, AC_ERR_* mask on failure
1782 unsigned ata_exec_internal(struct ata_device *dev,
1783 struct ata_taskfile *tf, const u8 *cdb,
1784 int dma_dir, void *buf, unsigned int buflen,
1785 unsigned long timeout)
1787 struct scatterlist *psg = NULL, sg;
1788 unsigned int n_elem = 0;
1790 if (dma_dir != DMA_NONE) {
1792 sg_init_one(&sg, buf, buflen);
1797 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1802 * ata_do_simple_cmd - execute simple internal command
1803 * @dev: Device to which the command is sent
1804 * @cmd: Opcode to execute
1806 * Execute a 'simple' command, that only consists of the opcode
1807 * 'cmd' itself, without filling any other registers
1810 * Kernel thread context (may sleep).
1813 * Zero on success, AC_ERR_* mask on failure
1815 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1817 struct ata_taskfile tf;
1819 ata_tf_init(dev, &tf);
1822 tf.flags |= ATA_TFLAG_DEVICE;
1823 tf.protocol = ATA_PROT_NODATA;
1825 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1829 * ata_pio_need_iordy - check if iordy needed
1832 * Check if the current speed of the device requires IORDY. Used
1833 * by various controllers for chip configuration.
1836 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1838 /* Controller doesn't support IORDY. Probably a pointless check
1839 as the caller should know this */
1840 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1842 /* PIO3 and higher it is mandatory */
1843 if (adev->pio_mode > XFER_PIO_2)
1845 /* We turn it on when possible */
1846 if (ata_id_has_iordy(adev->id))
1852 * ata_pio_mask_no_iordy - Return the non IORDY mask
1855 * Compute the highest mode possible if we are not using iordy. Return
1856 * -1 if no iordy mode is available.
1859 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1861 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1862 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1863 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1864 /* Is the speed faster than the drive allows non IORDY ? */
1866 /* This is cycle times not frequency - watch the logic! */
1867 if (pio > 240) /* PIO2 is 240nS per cycle */
1868 return 3 << ATA_SHIFT_PIO;
1869 return 7 << ATA_SHIFT_PIO;
1872 return 3 << ATA_SHIFT_PIO;
1876 * ata_dev_read_id - Read ID data from the specified device
1877 * @dev: target device
1878 * @p_class: pointer to class of the target device (may be changed)
1879 * @flags: ATA_READID_* flags
1880 * @id: buffer to read IDENTIFY data into
1882 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1883 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1884 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1885 * for pre-ATA4 drives.
1887 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1888 * now we abort if we hit that case.
1891 * Kernel thread context (may sleep)
1894 * 0 on success, -errno otherwise.
1896 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1897 unsigned int flags, u16 *id)
1899 struct ata_port *ap = dev->link->ap;
1900 unsigned int class = *p_class;
1901 struct ata_taskfile tf;
1902 unsigned int err_mask = 0;
1904 int may_fallback = 1, tried_spinup = 0;
1907 if (ata_msg_ctl(ap))
1908 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1910 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1912 ata_tf_init(dev, &tf);
1916 tf.command = ATA_CMD_ID_ATA;
1919 tf.command = ATA_CMD_ID_ATAPI;
1923 reason = "unsupported class";
1927 tf.protocol = ATA_PROT_PIO;
1929 /* Some devices choke if TF registers contain garbage. Make
1930 * sure those are properly initialized.
1932 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1934 /* Device presence detection is unreliable on some
1935 * controllers. Always poll IDENTIFY if available.
1937 tf.flags |= ATA_TFLAG_POLLING;
1939 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1940 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1942 if (err_mask & AC_ERR_NODEV_HINT) {
1943 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1944 ap->print_id, dev->devno);
1948 /* Device or controller might have reported the wrong
1949 * device class. Give a shot at the other IDENTIFY if
1950 * the current one is aborted by the device.
1953 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1956 if (class == ATA_DEV_ATA)
1957 class = ATA_DEV_ATAPI;
1959 class = ATA_DEV_ATA;
1964 reason = "I/O error";
1968 /* Falling back doesn't make sense if ID data was read
1969 * successfully at least once.
1973 swap_buf_le16(id, ATA_ID_WORDS);
1977 reason = "device reports invalid type";
1979 if (class == ATA_DEV_ATA) {
1980 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1983 if (ata_id_is_ata(id))
1987 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1990 * Drive powered-up in standby mode, and requires a specific
1991 * SET_FEATURES spin-up subcommand before it will accept
1992 * anything other than the original IDENTIFY command.
1994 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1995 if (err_mask && id[2] != 0x738c) {
1997 reason = "SPINUP failed";
2001 * If the drive initially returned incomplete IDENTIFY info,
2002 * we now must reissue the IDENTIFY command.
2004 if (id[2] == 0x37c8)
2008 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2010 * The exact sequence expected by certain pre-ATA4 drives is:
2012 * IDENTIFY (optional in early ATA)
2013 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2015 * Some drives were very specific about that exact sequence.
2017 * Note that ATA4 says lba is mandatory so the second check
2018 * shoud never trigger.
2020 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2021 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2024 reason = "INIT_DEV_PARAMS failed";
2028 /* current CHS translation info (id[53-58]) might be
2029 * changed. reread the identify device info.
2031 flags &= ~ATA_READID_POSTRESET;
2041 if (ata_msg_warn(ap))
2042 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2043 "(%s, err_mask=0x%x)\n", reason, err_mask);
2047 static inline u8 ata_dev_knobble(struct ata_device *dev)
2049 struct ata_port *ap = dev->link->ap;
2050 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2053 static void ata_dev_config_ncq(struct ata_device *dev,
2054 char *desc, size_t desc_sz)
2056 struct ata_port *ap = dev->link->ap;
2057 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2059 if (!ata_id_has_ncq(dev->id)) {
2063 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2064 snprintf(desc, desc_sz, "NCQ (not used)");
2067 if (ap->flags & ATA_FLAG_NCQ) {
2068 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2069 dev->flags |= ATA_DFLAG_NCQ;
2072 if (hdepth >= ddepth)
2073 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2075 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2079 * ata_dev_configure - Configure the specified ATA/ATAPI device
2080 * @dev: Target device to configure
2082 * Configure @dev according to @dev->id. Generic and low-level
2083 * driver specific fixups are also applied.
2086 * Kernel thread context (may sleep)
2089 * 0 on success, -errno otherwise
2091 int ata_dev_configure(struct ata_device *dev)
2093 struct ata_port *ap = dev->link->ap;
2094 struct ata_eh_context *ehc = &dev->link->eh_context;
2095 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2096 const u16 *id = dev->id;
2097 unsigned int xfer_mask;
2098 char revbuf[7]; /* XYZ-99\0 */
2099 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2100 char modelbuf[ATA_ID_PROD_LEN+1];
2103 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2104 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2109 if (ata_msg_probe(ap))
2110 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
2113 dev->horkage |= ata_dev_blacklisted(dev);
2115 /* let ACPI work its magic */
2116 rc = ata_acpi_on_devcfg(dev);
2120 /* massage HPA, do it early as it might change IDENTIFY data */
2121 rc = ata_hpa_resize(dev);
2125 /* print device capabilities */
2126 if (ata_msg_probe(ap))
2127 ata_dev_printk(dev, KERN_DEBUG,
2128 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2129 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2131 id[49], id[82], id[83], id[84],
2132 id[85], id[86], id[87], id[88]);
2134 /* initialize to-be-configured parameters */
2135 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2136 dev->max_sectors = 0;
2144 * common ATA, ATAPI feature tests
2147 /* find max transfer mode; for printk only */
2148 xfer_mask = ata_id_xfermask(id);
2150 if (ata_msg_probe(ap))
2153 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2154 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2157 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2160 /* ATA-specific feature tests */
2161 if (dev->class == ATA_DEV_ATA) {
2162 if (ata_id_is_cfa(id)) {
2163 if (id[162] & 1) /* CPRM may make this media unusable */
2164 ata_dev_printk(dev, KERN_WARNING,
2165 "supports DRM functions and may "
2166 "not be fully accessable.\n");
2167 snprintf(revbuf, 7, "CFA");
2169 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2170 /* Warn the user if the device has TPM extensions */
2171 if (ata_id_has_tpm(id))
2172 ata_dev_printk(dev, KERN_WARNING,
2173 "supports DRM functions and may "
2174 "not be fully accessable.\n");
2177 dev->n_sectors = ata_id_n_sectors(id);
2179 if (dev->id[59] & 0x100)
2180 dev->multi_count = dev->id[59] & 0xff;
2182 if (ata_id_has_lba(id)) {
2183 const char *lba_desc;
2187 dev->flags |= ATA_DFLAG_LBA;
2188 if (ata_id_has_lba48(id)) {
2189 dev->flags |= ATA_DFLAG_LBA48;
2192 if (dev->n_sectors >= (1UL << 28) &&
2193 ata_id_has_flush_ext(id))
2194 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2198 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2200 /* print device info to dmesg */
2201 if (ata_msg_drv(ap) && print_info) {
2202 ata_dev_printk(dev, KERN_INFO,
2203 "%s: %s, %s, max %s\n",
2204 revbuf, modelbuf, fwrevbuf,
2205 ata_mode_string(xfer_mask));
2206 ata_dev_printk(dev, KERN_INFO,
2207 "%Lu sectors, multi %u: %s %s\n",
2208 (unsigned long long)dev->n_sectors,
2209 dev->multi_count, lba_desc, ncq_desc);
2214 /* Default translation */
2215 dev->cylinders = id[1];
2217 dev->sectors = id[6];
2219 if (ata_id_current_chs_valid(id)) {
2220 /* Current CHS translation is valid. */
2221 dev->cylinders = id[54];
2222 dev->heads = id[55];
2223 dev->sectors = id[56];
2226 /* print device info to dmesg */
2227 if (ata_msg_drv(ap) && print_info) {
2228 ata_dev_printk(dev, KERN_INFO,
2229 "%s: %s, %s, max %s\n",
2230 revbuf, modelbuf, fwrevbuf,
2231 ata_mode_string(xfer_mask));
2232 ata_dev_printk(dev, KERN_INFO,
2233 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2234 (unsigned long long)dev->n_sectors,
2235 dev->multi_count, dev->cylinders,
2236 dev->heads, dev->sectors);
2243 /* ATAPI-specific feature tests */
2244 else if (dev->class == ATA_DEV_ATAPI) {
2245 const char *cdb_intr_string = "";
2246 const char *atapi_an_string = "";
2249 rc = atapi_cdb_len(id);
2250 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2251 if (ata_msg_warn(ap))
2252 ata_dev_printk(dev, KERN_WARNING,
2253 "unsupported CDB len\n");
2257 dev->cdb_len = (unsigned int) rc;
2259 /* Enable ATAPI AN if both the host and device have
2260 * the support. If PMP is attached, SNTF is required
2261 * to enable ATAPI AN to discern between PHY status
2262 * changed notifications and ATAPI ANs.
2264 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2265 (!ap->nr_pmp_links ||
2266 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2267 unsigned int err_mask;
2269 /* issue SET feature command to turn this on */
2270 err_mask = ata_dev_set_feature(dev,
2271 SETFEATURES_SATA_ENABLE, SATA_AN);
2273 ata_dev_printk(dev, KERN_ERR,
2274 "failed to enable ATAPI AN "
2275 "(err_mask=0x%x)\n", err_mask);
2277 dev->flags |= ATA_DFLAG_AN;
2278 atapi_an_string = ", ATAPI AN";
2282 if (ata_id_cdb_intr(dev->id)) {
2283 dev->flags |= ATA_DFLAG_CDB_INTR;
2284 cdb_intr_string = ", CDB intr";
2287 /* print device info to dmesg */
2288 if (ata_msg_drv(ap) && print_info)
2289 ata_dev_printk(dev, KERN_INFO,
2290 "ATAPI: %s, %s, max %s%s%s\n",
2292 ata_mode_string(xfer_mask),
2293 cdb_intr_string, atapi_an_string);
2296 /* determine max_sectors */
2297 dev->max_sectors = ATA_MAX_SECTORS;
2298 if (dev->flags & ATA_DFLAG_LBA48)
2299 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2301 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2302 if (ata_id_has_hipm(dev->id))
2303 dev->flags |= ATA_DFLAG_HIPM;
2304 if (ata_id_has_dipm(dev->id))
2305 dev->flags |= ATA_DFLAG_DIPM;
2308 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2309 /* Let the user know. We don't want to disallow opens for
2310 rescue purposes, or in case the vendor is just a blithering
2313 ata_dev_printk(dev, KERN_WARNING,
2314 "Drive reports diagnostics failure. This may indicate a drive\n");
2315 ata_dev_printk(dev, KERN_WARNING,
2316 "fault or invalid emulation. Contact drive vendor for information.\n");
2320 /* limit bridge transfers to udma5, 200 sectors */
2321 if (ata_dev_knobble(dev)) {
2322 if (ata_msg_drv(ap) && print_info)
2323 ata_dev_printk(dev, KERN_INFO,
2324 "applying bridge limits\n");
2325 dev->udma_mask &= ATA_UDMA5;
2326 dev->max_sectors = ATA_MAX_SECTORS;
2329 if ((dev->class == ATA_DEV_ATAPI) &&
2330 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2331 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2332 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2335 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2336 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2339 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2340 dev->horkage |= ATA_HORKAGE_IPM;
2342 /* reset link pm_policy for this port to no pm */
2343 ap->pm_policy = MAX_PERFORMANCE;
2346 if (ap->ops->dev_config)
2347 ap->ops->dev_config(dev);
2349 if (ata_msg_probe(ap))
2350 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2351 __FUNCTION__, ata_chk_status(ap));
2355 if (ata_msg_probe(ap))
2356 ata_dev_printk(dev, KERN_DEBUG,
2357 "%s: EXIT, err\n", __FUNCTION__);
2362 * ata_cable_40wire - return 40 wire cable type
2365 * Helper method for drivers which want to hardwire 40 wire cable
2369 int ata_cable_40wire(struct ata_port *ap)
2371 return ATA_CBL_PATA40;
2375 * ata_cable_80wire - return 80 wire cable type
2378 * Helper method for drivers which want to hardwire 80 wire cable
2382 int ata_cable_80wire(struct ata_port *ap)
2384 return ATA_CBL_PATA80;
2388 * ata_cable_unknown - return unknown PATA cable.
2391 * Helper method for drivers which have no PATA cable detection.
2394 int ata_cable_unknown(struct ata_port *ap)
2396 return ATA_CBL_PATA_UNK;
2400 * ata_cable_sata - return SATA cable type
2403 * Helper method for drivers which have SATA cables
2406 int ata_cable_sata(struct ata_port *ap)
2408 return ATA_CBL_SATA;
2412 * ata_bus_probe - Reset and probe ATA bus
2415 * Master ATA bus probing function. Initiates a hardware-dependent
2416 * bus reset, then attempts to identify any devices found on
2420 * PCI/etc. bus probe sem.
2423 * Zero on success, negative errno otherwise.
2426 int ata_bus_probe(struct ata_port *ap)
2428 unsigned int classes[ATA_MAX_DEVICES];
2429 int tries[ATA_MAX_DEVICES];
2431 struct ata_device *dev;
2435 ata_link_for_each_dev(dev, &ap->link)
2436 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2439 ata_link_for_each_dev(dev, &ap->link) {
2440 /* If we issue an SRST then an ATA drive (not ATAPI)
2441 * may change configuration and be in PIO0 timing. If
2442 * we do a hard reset (or are coming from power on)
2443 * this is true for ATA or ATAPI. Until we've set a
2444 * suitable controller mode we should not touch the
2445 * bus as we may be talking too fast.
2447 dev->pio_mode = XFER_PIO_0;
2449 /* If the controller has a pio mode setup function
2450 * then use it to set the chipset to rights. Don't
2451 * touch the DMA setup as that will be dealt with when
2452 * configuring devices.
2454 if (ap->ops->set_piomode)
2455 ap->ops->set_piomode(ap, dev);
2458 /* reset and determine device classes */
2459 ap->ops->phy_reset(ap);
2461 ata_link_for_each_dev(dev, &ap->link) {
2462 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2463 dev->class != ATA_DEV_UNKNOWN)
2464 classes[dev->devno] = dev->class;
2466 classes[dev->devno] = ATA_DEV_NONE;
2468 dev->class = ATA_DEV_UNKNOWN;
2473 /* read IDENTIFY page and configure devices. We have to do the identify
2474 specific sequence bass-ackwards so that PDIAG- is released by
2477 ata_link_for_each_dev(dev, &ap->link) {
2478 if (tries[dev->devno])
2479 dev->class = classes[dev->devno];
2481 if (!ata_dev_enabled(dev))
2484 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2490 /* Now ask for the cable type as PDIAG- should have been released */
2491 if (ap->ops->cable_detect)
2492 ap->cbl = ap->ops->cable_detect(ap);
2494 /* We may have SATA bridge glue hiding here irrespective of the
2495 reported cable types and sensed types */
2496 ata_link_for_each_dev(dev, &ap->link) {
2497 if (!ata_dev_enabled(dev))
2499 /* SATA drives indicate we have a bridge. We don't know which
2500 end of the link the bridge is which is a problem */
2501 if (ata_id_is_sata(dev->id))
2502 ap->cbl = ATA_CBL_SATA;
2505 /* After the identify sequence we can now set up the devices. We do
2506 this in the normal order so that the user doesn't get confused */
2508 ata_link_for_each_dev(dev, &ap->link) {
2509 if (!ata_dev_enabled(dev))
2512 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2513 rc = ata_dev_configure(dev);
2514 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2519 /* configure transfer mode */
2520 rc = ata_set_mode(&ap->link, &dev);
2524 ata_link_for_each_dev(dev, &ap->link)
2525 if (ata_dev_enabled(dev))
2528 /* no device present, disable port */
2529 ata_port_disable(ap);
2533 tries[dev->devno]--;
2537 /* eeek, something went very wrong, give up */
2538 tries[dev->devno] = 0;
2542 /* give it just one more chance */
2543 tries[dev->devno] = min(tries[dev->devno], 1);
2545 if (tries[dev->devno] == 1) {
2546 /* This is the last chance, better to slow
2547 * down than lose it.
2549 sata_down_spd_limit(&ap->link);
2550 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2554 if (!tries[dev->devno])
2555 ata_dev_disable(dev);
2561 * ata_port_probe - Mark port as enabled
2562 * @ap: Port for which we indicate enablement
2564 * Modify @ap data structure such that the system
2565 * thinks that the entire port is enabled.
2567 * LOCKING: host lock, or some other form of
2571 void ata_port_probe(struct ata_port *ap)
2573 ap->flags &= ~ATA_FLAG_DISABLED;
2577 * sata_print_link_status - Print SATA link status
2578 * @link: SATA link to printk link status about
2580 * This function prints link speed and status of a SATA link.
2585 void sata_print_link_status(struct ata_link *link)
2587 u32 sstatus, scontrol, tmp;
2589 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2591 sata_scr_read(link, SCR_CONTROL, &scontrol);
2593 if (ata_link_online(link)) {
2594 tmp = (sstatus >> 4) & 0xf;
2595 ata_link_printk(link, KERN_INFO,
2596 "SATA link up %s (SStatus %X SControl %X)\n",
2597 sata_spd_string(tmp), sstatus, scontrol);
2599 ata_link_printk(link, KERN_INFO,
2600 "SATA link down (SStatus %X SControl %X)\n",
2606 * ata_dev_pair - return other device on cable
2609 * Obtain the other device on the same cable, or if none is
2610 * present NULL is returned
2613 struct ata_device *ata_dev_pair(struct ata_device *adev)
2615 struct ata_link *link = adev->link;
2616 struct ata_device *pair = &link->device[1 - adev->devno];
2617 if (!ata_dev_enabled(pair))
2623 * ata_port_disable - Disable port.
2624 * @ap: Port to be disabled.
2626 * Modify @ap data structure such that the system
2627 * thinks that the entire port is disabled, and should
2628 * never attempt to probe or communicate with devices
2631 * LOCKING: host lock, or some other form of
2635 void ata_port_disable(struct ata_port *ap)
2637 ap->link.device[0].class = ATA_DEV_NONE;
2638 ap->link.device[1].class = ATA_DEV_NONE;
2639 ap->flags |= ATA_FLAG_DISABLED;
2643 * sata_down_spd_limit - adjust SATA spd limit downward
2644 * @link: Link to adjust SATA spd limit for
2646 * Adjust SATA spd limit of @link downward. Note that this
2647 * function only adjusts the limit. The change must be applied
2648 * using sata_set_spd().
2651 * Inherited from caller.
2654 * 0 on success, negative errno on failure
2656 int sata_down_spd_limit(struct ata_link *link)
2658 u32 sstatus, spd, mask;
2661 if (!sata_scr_valid(link))
2664 /* If SCR can be read, use it to determine the current SPD.
2665 * If not, use cached value in link->sata_spd.
2667 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2669 spd = (sstatus >> 4) & 0xf;
2671 spd = link->sata_spd;
2673 mask = link->sata_spd_limit;
2677 /* unconditionally mask off the highest bit */
2678 highbit = fls(mask) - 1;
2679 mask &= ~(1 << highbit);
2681 /* Mask off all speeds higher than or equal to the current
2682 * one. Force 1.5Gbps if current SPD is not available.
2685 mask &= (1 << (spd - 1)) - 1;
2689 /* were we already at the bottom? */
2693 link->sata_spd_limit = mask;
2695 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2696 sata_spd_string(fls(mask)));
2701 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2703 struct ata_link *host_link = &link->ap->link;
2704 u32 limit, target, spd;
2706 limit = link->sata_spd_limit;
2708 /* Don't configure downstream link faster than upstream link.
2709 * It doesn't speed up anything and some PMPs choke on such
2712 if (!ata_is_host_link(link) && host_link->sata_spd)
2713 limit &= (1 << host_link->sata_spd) - 1;
2715 if (limit == UINT_MAX)
2718 target = fls(limit);
2720 spd = (*scontrol >> 4) & 0xf;
2721 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2723 return spd != target;
2727 * sata_set_spd_needed - is SATA spd configuration needed
2728 * @link: Link in question
2730 * Test whether the spd limit in SControl matches
2731 * @link->sata_spd_limit. This function is used to determine
2732 * whether hardreset is necessary to apply SATA spd
2736 * Inherited from caller.
2739 * 1 if SATA spd configuration is needed, 0 otherwise.
2741 int sata_set_spd_needed(struct ata_link *link)
2745 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2748 return __sata_set_spd_needed(link, &scontrol);
2752 * sata_set_spd - set SATA spd according to spd limit
2753 * @link: Link to set SATA spd for
2755 * Set SATA spd of @link according to sata_spd_limit.
2758 * Inherited from caller.
2761 * 0 if spd doesn't need to be changed, 1 if spd has been
2762 * changed. Negative errno if SCR registers are inaccessible.
2764 int sata_set_spd(struct ata_link *link)
2769 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2772 if (!__sata_set_spd_needed(link, &scontrol))
2775 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2782 * This mode timing computation functionality is ported over from
2783 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2786 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2787 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2788 * for UDMA6, which is currently supported only by Maxtor drives.
2790 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2793 static const struct ata_timing ata_timing[] = {
2795 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2796 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2797 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2798 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2800 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2801 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2802 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2803 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2804 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2806 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2808 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2809 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2810 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2812 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2813 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2814 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2816 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2817 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2818 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2819 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2821 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2822 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2823 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2825 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2830 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2831 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2833 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2835 q->setup = EZ(t->setup * 1000, T);
2836 q->act8b = EZ(t->act8b * 1000, T);
2837 q->rec8b = EZ(t->rec8b * 1000, T);
2838 q->cyc8b = EZ(t->cyc8b * 1000, T);
2839 q->active = EZ(t->active * 1000, T);
2840 q->recover = EZ(t->recover * 1000, T);
2841 q->cycle = EZ(t->cycle * 1000, T);
2842 q->udma = EZ(t->udma * 1000, UT);
2845 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2846 struct ata_timing *m, unsigned int what)
2848 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2849 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2850 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2851 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2852 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2853 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2854 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2855 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2858 static const struct ata_timing *ata_timing_find_mode(unsigned short speed)
2860 const struct ata_timing *t;
2862 for (t = ata_timing; t->mode != speed; t++)
2863 if (t->mode == 0xFF)
2868 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2869 struct ata_timing *t, int T, int UT)
2871 const struct ata_timing *s;
2872 struct ata_timing p;
2878 if (!(s = ata_timing_find_mode(speed)))
2881 memcpy(t, s, sizeof(*s));
2884 * If the drive is an EIDE drive, it can tell us it needs extended
2885 * PIO/MW_DMA cycle timing.
2888 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2889 memset(&p, 0, sizeof(p));
2890 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2891 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2892 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2893 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2894 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2896 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2900 * Convert the timing to bus clock counts.
2903 ata_timing_quantize(t, t, T, UT);
2906 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2907 * S.M.A.R.T * and some other commands. We have to ensure that the
2908 * DMA cycle timing is slower/equal than the fastest PIO timing.
2911 if (speed > XFER_PIO_6) {
2912 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2913 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2917 * Lengthen active & recovery time so that cycle time is correct.
2920 if (t->act8b + t->rec8b < t->cyc8b) {
2921 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2922 t->rec8b = t->cyc8b - t->act8b;
2925 if (t->active + t->recover < t->cycle) {
2926 t->active += (t->cycle - (t->active + t->recover)) / 2;
2927 t->recover = t->cycle - t->active;
2930 /* In a few cases quantisation may produce enough errors to
2931 leave t->cycle too low for the sum of active and recovery
2932 if so we must correct this */
2933 if (t->active + t->recover > t->cycle)
2934 t->cycle = t->active + t->recover;
2940 * ata_down_xfermask_limit - adjust dev xfer masks downward
2941 * @dev: Device to adjust xfer masks
2942 * @sel: ATA_DNXFER_* selector
2944 * Adjust xfer masks of @dev downward. Note that this function
2945 * does not apply the change. Invoking ata_set_mode() afterwards
2946 * will apply the limit.
2949 * Inherited from caller.
2952 * 0 on success, negative errno on failure
2954 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2957 unsigned int orig_mask, xfer_mask;
2958 unsigned int pio_mask, mwdma_mask, udma_mask;
2961 quiet = !!(sel & ATA_DNXFER_QUIET);
2962 sel &= ~ATA_DNXFER_QUIET;
2964 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2967 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2970 case ATA_DNXFER_PIO:
2971 highbit = fls(pio_mask) - 1;
2972 pio_mask &= ~(1 << highbit);
2975 case ATA_DNXFER_DMA:
2977 highbit = fls(udma_mask) - 1;
2978 udma_mask &= ~(1 << highbit);
2981 } else if (mwdma_mask) {
2982 highbit = fls(mwdma_mask) - 1;
2983 mwdma_mask &= ~(1 << highbit);
2989 case ATA_DNXFER_40C:
2990 udma_mask &= ATA_UDMA_MASK_40C;
2993 case ATA_DNXFER_FORCE_PIO0:
2995 case ATA_DNXFER_FORCE_PIO:
3004 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3006 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3010 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3011 snprintf(buf, sizeof(buf), "%s:%s",
3012 ata_mode_string(xfer_mask),
3013 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3015 snprintf(buf, sizeof(buf), "%s",
3016 ata_mode_string(xfer_mask));
3018 ata_dev_printk(dev, KERN_WARNING,
3019 "limiting speed to %s\n", buf);
3022 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3028 static int ata_dev_set_mode(struct ata_device *dev)
3030 struct ata_eh_context *ehc = &dev->link->eh_context;
3031 unsigned int err_mask;
3034 dev->flags &= ~ATA_DFLAG_PIO;
3035 if (dev->xfer_shift == ATA_SHIFT_PIO)
3036 dev->flags |= ATA_DFLAG_PIO;
3038 err_mask = ata_dev_set_xfermode(dev);
3040 /* Old CFA may refuse this command, which is just fine */
3041 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3042 err_mask &= ~AC_ERR_DEV;
3044 /* Some very old devices and some bad newer ones fail any kind of
3045 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3046 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3047 dev->pio_mode <= XFER_PIO_2)
3048 err_mask &= ~AC_ERR_DEV;
3050 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3051 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3052 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3053 dev->dma_mode == XFER_MW_DMA_0 &&
3054 (dev->id[63] >> 8) & 1)
3055 err_mask &= ~AC_ERR_DEV;
3058 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3059 "(err_mask=0x%x)\n", err_mask);
3063 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3064 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3065 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3069 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3070 dev->xfer_shift, (int)dev->xfer_mode);
3072 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
3073 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
3078 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3079 * @link: link on which timings will be programmed
3080 * @r_failed_dev: out paramter for failed device
3082 * Standard implementation of the function used to tune and set
3083 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3084 * ata_dev_set_mode() fails, pointer to the failing device is
3085 * returned in @r_failed_dev.
3088 * PCI/etc. bus probe sem.
3091 * 0 on success, negative errno otherwise
3094 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3096 struct ata_port *ap = link->ap;
3097 struct ata_device *dev;
3098 int rc = 0, used_dma = 0, found = 0;
3100 /* step 1: calculate xfer_mask */
3101 ata_link_for_each_dev(dev, link) {
3102 unsigned int pio_mask, dma_mask;
3103 unsigned int mode_mask;
3105 if (!ata_dev_enabled(dev))
3108 mode_mask = ATA_DMA_MASK_ATA;
3109 if (dev->class == ATA_DEV_ATAPI)
3110 mode_mask = ATA_DMA_MASK_ATAPI;
3111 else if (ata_id_is_cfa(dev->id))
3112 mode_mask = ATA_DMA_MASK_CFA;
3114 ata_dev_xfermask(dev);
3116 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3117 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3119 if (libata_dma_mask & mode_mask)
3120 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3124 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3125 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3134 /* step 2: always set host PIO timings */
3135 ata_link_for_each_dev(dev, link) {
3136 if (!ata_dev_enabled(dev))
3139 if (!dev->pio_mode) {
3140 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3145 dev->xfer_mode = dev->pio_mode;
3146 dev->xfer_shift = ATA_SHIFT_PIO;
3147 if (ap->ops->set_piomode)
3148 ap->ops->set_piomode(ap, dev);
3151 /* step 3: set host DMA timings */
3152 ata_link_for_each_dev(dev, link) {
3153 if (!ata_dev_enabled(dev) || !dev->dma_mode)
3156 dev->xfer_mode = dev->dma_mode;
3157 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3158 if (ap->ops->set_dmamode)
3159 ap->ops->set_dmamode(ap, dev);
3162 /* step 4: update devices' xfer mode */
3163 ata_link_for_each_dev(dev, link) {
3164 /* don't update suspended devices' xfer mode */
3165 if (!ata_dev_enabled(dev))
3168 rc = ata_dev_set_mode(dev);
3173 /* Record simplex status. If we selected DMA then the other
3174 * host channels are not permitted to do so.
3176 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3177 ap->host->simplex_claimed = ap;
3181 *r_failed_dev = dev;
3186 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3187 * @link: link on which timings will be programmed
3188 * @r_failed_dev: out paramter for failed device
3190 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3191 * ata_set_mode() fails, pointer to the failing device is
3192 * returned in @r_failed_dev.
3195 * PCI/etc. bus probe sem.
3198 * 0 on success, negative errno otherwise
3200 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3202 struct ata_port *ap = link->ap;
3204 /* has private set_mode? */
3205 if (ap->ops->set_mode)
3206 return ap->ops->set_mode(link, r_failed_dev);
3207 return ata_do_set_mode(link, r_failed_dev);
3211 * ata_tf_to_host - issue ATA taskfile to host controller
3212 * @ap: port to which command is being issued
3213 * @tf: ATA taskfile register set
3215 * Issues ATA taskfile register set to ATA host controller,
3216 * with proper synchronization with interrupt handler and
3220 * spin_lock_irqsave(host lock)
3223 static inline void ata_tf_to_host(struct ata_port *ap,
3224 const struct ata_taskfile *tf)
3226 ap->ops->tf_load(ap, tf);
3227 ap->ops->exec_command(ap, tf);
3231 * ata_busy_sleep - sleep until BSY clears, or timeout
3232 * @ap: port containing status register to be polled
3233 * @tmout_pat: impatience timeout
3234 * @tmout: overall timeout
3236 * Sleep until ATA Status register bit BSY clears,
3237 * or a timeout occurs.
3240 * Kernel thread context (may sleep).
3243 * 0 on success, -errno otherwise.
3245 int ata_busy_sleep(struct ata_port *ap,
3246 unsigned long tmout_pat, unsigned long tmout)
3248 unsigned long timer_start, timeout;
3251 status = ata_busy_wait(ap, ATA_BUSY, 300);
3252 timer_start = jiffies;
3253 timeout = timer_start + tmout_pat;
3254 while (status != 0xff && (status & ATA_BUSY) &&
3255 time_before(jiffies, timeout)) {
3257 status = ata_busy_wait(ap, ATA_BUSY, 3);
3260 if (status != 0xff && (status & ATA_BUSY))
3261 ata_port_printk(ap, KERN_WARNING,
3262 "port is slow to respond, please be patient "
3263 "(Status 0x%x)\n", status);
3265 timeout = timer_start + tmout;
3266 while (status != 0xff && (status & ATA_BUSY) &&
3267 time_before(jiffies, timeout)) {
3269 status = ata_chk_status(ap);
3275 if (status & ATA_BUSY) {
3276 ata_port_printk(ap, KERN_ERR, "port failed to respond "
3277 "(%lu secs, Status 0x%x)\n",
3278 tmout / HZ, status);
3286 * ata_wait_after_reset - wait before checking status after reset
3287 * @ap: port containing status register to be polled
3288 * @deadline: deadline jiffies for the operation
3290 * After reset, we need to pause a while before reading status.
3291 * Also, certain combination of controller and device report 0xff
3292 * for some duration (e.g. until SATA PHY is up and running)
3293 * which is interpreted as empty port in ATA world. This
3294 * function also waits for such devices to get out of 0xff
3298 * Kernel thread context (may sleep).
3300 void ata_wait_after_reset(struct ata_port *ap, unsigned long deadline)
3302 unsigned long until = jiffies + ATA_TMOUT_FF_WAIT;
3304 if (time_before(until, deadline))
3307 /* Spec mandates ">= 2ms" before checking status. We wait
3308 * 150ms, because that was the magic delay used for ATAPI
3309 * devices in Hale Landis's ATADRVR, for the period of time
3310 * between when the ATA command register is written, and then
3311 * status is checked. Because waiting for "a while" before
3312 * checking status is fine, post SRST, we perform this magic
3313 * delay here as well.
3315 * Old drivers/ide uses the 2mS rule and then waits for ready.
3319 /* Wait for 0xff to clear. Some SATA devices take a long time
3320 * to clear 0xff after reset. For example, HHD424020F7SV00
3321 * iVDR needs >= 800ms while. Quantum GoVault needs even more
3324 * Note that some PATA controllers (pata_ali) explode if
3325 * status register is read more than once when there's no
3328 if (ap->flags & ATA_FLAG_SATA) {
3330 u8 status = ata_chk_status(ap);
3332 if (status != 0xff || time_after(jiffies, deadline))
3341 * ata_wait_ready - sleep until BSY clears, or timeout
3342 * @ap: port containing status register to be polled
3343 * @deadline: deadline jiffies for the operation
3345 * Sleep until ATA Status register bit BSY clears, or timeout
3349 * Kernel thread context (may sleep).
3352 * 0 on success, -errno otherwise.
3354 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
3356 unsigned long start = jiffies;
3360 u8 status = ata_chk_status(ap);
3361 unsigned long now = jiffies;
3363 if (!(status & ATA_BUSY))
3365 if (!ata_link_online(&ap->link) && status == 0xff)
3367 if (time_after(now, deadline))
3370 if (!warned && time_after(now, start + 5 * HZ) &&
3371 (deadline - now > 3 * HZ)) {
3372 ata_port_printk(ap, KERN_WARNING,
3373 "port is slow to respond, please be patient "
3374 "(Status 0x%x)\n", status);
3382 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3383 unsigned long deadline)
3385 struct ata_ioports *ioaddr = &ap->ioaddr;
3386 unsigned int dev0 = devmask & (1 << 0);
3387 unsigned int dev1 = devmask & (1 << 1);
3390 /* if device 0 was found in ata_devchk, wait for its
3394 rc = ata_wait_ready(ap, deadline);
3402 /* if device 1 was found in ata_devchk, wait for register
3403 * access briefly, then wait for BSY to clear.
3408 ap->ops->dev_select(ap, 1);
3410 /* Wait for register access. Some ATAPI devices fail
3411 * to set nsect/lbal after reset, so don't waste too
3412 * much time on it. We're gonna wait for !BSY anyway.
3414 for (i = 0; i < 2; i++) {
3417 nsect = ioread8(ioaddr->nsect_addr);
3418 lbal = ioread8(ioaddr->lbal_addr);
3419 if ((nsect == 1) && (lbal == 1))
3421 msleep(50); /* give drive a breather */
3424 rc = ata_wait_ready(ap, deadline);
3432 /* is all this really necessary? */
3433 ap->ops->dev_select(ap, 0);
3435 ap->ops->dev_select(ap, 1);
3437 ap->ops->dev_select(ap, 0);
3442 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3443 unsigned long deadline)
3445 struct ata_ioports *ioaddr = &ap->ioaddr;
3447 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3449 /* software reset. causes dev0 to be selected */
3450 iowrite8(ap->ctl, ioaddr->ctl_addr);
3451 udelay(20); /* FIXME: flush */
3452 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3453 udelay(20); /* FIXME: flush */
3454 iowrite8(ap->ctl, ioaddr->ctl_addr);
3456 /* wait a while before checking status */
3457 ata_wait_after_reset(ap, deadline);
3459 /* Before we perform post reset processing we want to see if
3460 * the bus shows 0xFF because the odd clown forgets the D7
3461 * pulldown resistor.
3463 if (ata_chk_status(ap) == 0xFF)
3466 return ata_bus_post_reset(ap, devmask, deadline);
3470 * ata_bus_reset - reset host port and associated ATA channel
3471 * @ap: port to reset
3473 * This is typically the first time we actually start issuing
3474 * commands to the ATA channel. We wait for BSY to clear, then
3475 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3476 * result. Determine what devices, if any, are on the channel
3477 * by looking at the device 0/1 error register. Look at the signature
3478 * stored in each device's taskfile registers, to determine if
3479 * the device is ATA or ATAPI.
3482 * PCI/etc. bus probe sem.
3483 * Obtains host lock.
3486 * Sets ATA_FLAG_DISABLED if bus reset fails.
3489 void ata_bus_reset(struct ata_port *ap)
3491 struct ata_device *device = ap->link.device;
3492 struct ata_ioports *ioaddr = &ap->ioaddr;
3493 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3495 unsigned int dev0, dev1 = 0, devmask = 0;
3498 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3500 /* determine if device 0/1 are present */
3501 if (ap->flags & ATA_FLAG_SATA_RESET)
3504 dev0 = ata_devchk(ap, 0);
3506 dev1 = ata_devchk(ap, 1);
3510 devmask |= (1 << 0);
3512 devmask |= (1 << 1);
3514 /* select device 0 again */
3515 ap->ops->dev_select(ap, 0);
3517 /* issue bus reset */
3518 if (ap->flags & ATA_FLAG_SRST) {
3519 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3520 if (rc && rc != -ENODEV)
3525 * determine by signature whether we have ATA or ATAPI devices
3527 device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
3528 if ((slave_possible) && (err != 0x81))
3529 device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
3531 /* is double-select really necessary? */
3532 if (device[1].class != ATA_DEV_NONE)
3533 ap->ops->dev_select(ap, 1);
3534 if (device[0].class != ATA_DEV_NONE)
3535 ap->ops->dev_select(ap, 0);
3537 /* if no devices were detected, disable this port */
3538 if ((device[0].class == ATA_DEV_NONE) &&
3539 (device[1].class == ATA_DEV_NONE))
3542 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3543 /* set up device control for ATA_FLAG_SATA_RESET */
3544 iowrite8(ap->ctl, ioaddr->ctl_addr);
3551 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3552 ata_port_disable(ap);
3558 * sata_link_debounce - debounce SATA phy status
3559 * @link: ATA link to debounce SATA phy status for
3560 * @params: timing parameters { interval, duratinon, timeout } in msec
3561 * @deadline: deadline jiffies for the operation
3563 * Make sure SStatus of @link reaches stable state, determined by
3564 * holding the same value where DET is not 1 for @duration polled
3565 * every @interval, before @timeout. Timeout constraints the
3566 * beginning of the stable state. Because DET gets stuck at 1 on
3567 * some controllers after hot unplugging, this functions waits
3568 * until timeout then returns 0 if DET is stable at 1.
3570 * @timeout is further limited by @deadline. The sooner of the
3574 * Kernel thread context (may sleep)
3577 * 0 on success, -errno on failure.
3579 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3580 unsigned long deadline)
3582 unsigned long interval_msec = params[0];
3583 unsigned long duration = msecs_to_jiffies(params[1]);
3584 unsigned long last_jiffies, t;
3588 t = jiffies + msecs_to_jiffies(params[2]);
3589 if (time_before(t, deadline))
3592 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3597 last_jiffies = jiffies;
3600 msleep(interval_msec);
3601 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3607 if (cur == 1 && time_before(jiffies, deadline))
3609 if (time_after(jiffies, last_jiffies + duration))
3614 /* unstable, start over */
3616 last_jiffies = jiffies;
3618 /* Check deadline. If debouncing failed, return
3619 * -EPIPE to tell upper layer to lower link speed.
3621 if (time_after(jiffies, deadline))
3627 * sata_link_resume - resume SATA link
3628 * @link: ATA link to resume SATA
3629 * @params: timing parameters { interval, duratinon, timeout } in msec
3630 * @deadline: deadline jiffies for the operation
3632 * Resume SATA phy @link and debounce it.
3635 * Kernel thread context (may sleep)
3638 * 0 on success, -errno on failure.
3640 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3641 unsigned long deadline)
3646 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3649 scontrol = (scontrol & 0x0f0) | 0x300;
3651 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3654 /* Some PHYs react badly if SStatus is pounded immediately
3655 * after resuming. Delay 200ms before debouncing.
3659 return sata_link_debounce(link, params, deadline);
3663 * ata_std_prereset - prepare for reset
3664 * @link: ATA link to be reset
3665 * @deadline: deadline jiffies for the operation
3667 * @link is about to be reset. Initialize it. Failure from
3668 * prereset makes libata abort whole reset sequence and give up
3669 * that port, so prereset should be best-effort. It does its
3670 * best to prepare for reset sequence but if things go wrong, it
3671 * should just whine, not fail.
3674 * Kernel thread context (may sleep)
3677 * 0 on success, -errno otherwise.
3679 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3681 struct ata_port *ap = link->ap;
3682 struct ata_eh_context *ehc = &link->eh_context;
3683 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3686 /* handle link resume */
3687 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3688 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3689 ehc->i.action |= ATA_EH_HARDRESET;
3691 /* Some PMPs don't work with only SRST, force hardreset if PMP
3694 if (ap->flags & ATA_FLAG_PMP)
3695 ehc->i.action |= ATA_EH_HARDRESET;
3697 /* if we're about to do hardreset, nothing more to do */
3698 if (ehc->i.action & ATA_EH_HARDRESET)
3701 /* if SATA, resume link */
3702 if (ap->flags & ATA_FLAG_SATA) {
3703 rc = sata_link_resume(link, timing, deadline);
3704 /* whine about phy resume failure but proceed */
3705 if (rc && rc != -EOPNOTSUPP)
3706 ata_link_printk(link, KERN_WARNING, "failed to resume "
3707 "link for reset (errno=%d)\n", rc);
3710 /* Wait for !BSY if the controller can wait for the first D2H
3711 * Reg FIS and we don't know that no device is attached.
3713 if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
3714 rc = ata_wait_ready(ap, deadline);
3715 if (rc && rc != -ENODEV) {
3716 ata_link_printk(link, KERN_WARNING, "device not ready "
3717 "(errno=%d), forcing hardreset\n", rc);
3718 ehc->i.action |= ATA_EH_HARDRESET;
3726 * ata_std_softreset - reset host port via ATA SRST
3727 * @link: ATA link to reset
3728 * @classes: resulting classes of attached devices
3729 * @deadline: deadline jiffies for the operation
3731 * Reset host port using ATA SRST.
3734 * Kernel thread context (may sleep)
3737 * 0 on success, -errno otherwise.
3739 int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3740 unsigned long deadline)
3742 struct ata_port *ap = link->ap;
3743 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3744 unsigned int devmask = 0;
3750 if (ata_link_offline(link)) {
3751 classes[0] = ATA_DEV_NONE;
3755 /* determine if device 0/1 are present */
3756 if (ata_devchk(ap, 0))
3757 devmask |= (1 << 0);
3758 if (slave_possible && ata_devchk(ap, 1))
3759 devmask |= (1 << 1);
3761 /* select device 0 again */
3762 ap->ops->dev_select(ap, 0);
3764 /* issue bus reset */
3765 DPRINTK("about to softreset, devmask=%x\n", devmask);
3766 rc = ata_bus_softreset(ap, devmask, deadline);
3767 /* if link is occupied, -ENODEV too is an error */
3768 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
3769 ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3773 /* determine by signature whether we have ATA or ATAPI devices */
3774 classes[0] = ata_dev_try_classify(&link->device[0],
3775 devmask & (1 << 0), &err);
3776 if (slave_possible && err != 0x81)
3777 classes[1] = ata_dev_try_classify(&link->device[1],
3778 devmask & (1 << 1), &err);
3781 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3786 * sata_link_hardreset - reset link via SATA phy reset
3787 * @link: link to reset
3788 * @timing: timing parameters { interval, duratinon, timeout } in msec
3789 * @deadline: deadline jiffies for the operation
3791 * SATA phy-reset @link using DET bits of SControl register.
3794 * Kernel thread context (may sleep)
3797 * 0 on success, -errno otherwise.
3799 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3800 unsigned long deadline)
3807 if (sata_set_spd_needed(link)) {
3808 /* SATA spec says nothing about how to reconfigure
3809 * spd. To be on the safe side, turn off phy during
3810 * reconfiguration. This works for at least ICH7 AHCI
3813 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3816 scontrol = (scontrol & 0x0f0) | 0x304;
3818 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3824 /* issue phy wake/reset */
3825 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3828 scontrol = (scontrol & 0x0f0) | 0x301;
3830 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3833 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3834 * 10.4.2 says at least 1 ms.
3838 /* bring link back */
3839 rc = sata_link_resume(link, timing, deadline);
3841 DPRINTK("EXIT, rc=%d\n", rc);
3846 * sata_std_hardreset - reset host port via SATA phy reset
3847 * @link: link to reset
3848 * @class: resulting class of attached device
3849 * @deadline: deadline jiffies for the operation
3851 * SATA phy-reset host port using DET bits of SControl register,
3852 * wait for !BSY and classify the attached device.
3855 * Kernel thread context (may sleep)
3858 * 0 on success, -errno otherwise.
3860 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3861 unsigned long deadline)
3863 struct ata_port *ap = link->ap;
3864 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3870 rc = sata_link_hardreset(link, timing, deadline);
3872 ata_link_printk(link, KERN_ERR,
3873 "COMRESET failed (errno=%d)\n", rc);
3877 /* TODO: phy layer with polling, timeouts, etc. */
3878 if (ata_link_offline(link)) {
3879 *class = ATA_DEV_NONE;
3880 DPRINTK("EXIT, link offline\n");
3884 /* wait a while before checking status */
3885 ata_wait_after_reset(ap, deadline);
3887 /* If PMP is supported, we have to do follow-up SRST. Note
3888 * that some PMPs don't send D2H Reg FIS after hardreset at
3889 * all if the first port is empty. Wait for it just for a
3890 * second and request follow-up SRST.
3892 if (ap->flags & ATA_FLAG_PMP) {
3893 ata_wait_ready(ap, jiffies + HZ);
3897 rc = ata_wait_ready(ap, deadline);
3898 /* link occupied, -ENODEV too is an error */
3900 ata_link_printk(link, KERN_ERR,
3901 "COMRESET failed (errno=%d)\n", rc);
3905 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3907 *class = ata_dev_try_classify(link->device, 1, NULL);
3909 DPRINTK("EXIT, class=%u\n", *class);
3914 * ata_std_postreset - standard postreset callback
3915 * @link: the target ata_link
3916 * @classes: classes of attached devices
3918 * This function is invoked after a successful reset. Note that
3919 * the device might have been reset more than once using
3920 * different reset methods before postreset is invoked.
3923 * Kernel thread context (may sleep)
3925 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3927 struct ata_port *ap = link->ap;
3932 /* print link status */
3933 sata_print_link_status(link);
3936 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3937 sata_scr_write(link, SCR_ERROR, serror);
3938 link->eh_info.serror = 0;
3940 /* is double-select really necessary? */
3941 if (classes[0] != ATA_DEV_NONE)
3942 ap->ops->dev_select(ap, 1);
3943 if (classes[1] != ATA_DEV_NONE)
3944 ap->ops->dev_select(ap, 0);
3946 /* bail out if no device is present */
3947 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3948 DPRINTK("EXIT, no device\n");
3952 /* set up device control */
3953 if (ap->ioaddr.ctl_addr)
3954 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3960 * ata_dev_same_device - Determine whether new ID matches configured device
3961 * @dev: device to compare against
3962 * @new_class: class of the new device
3963 * @new_id: IDENTIFY page of the new device
3965 * Compare @new_class and @new_id against @dev and determine
3966 * whether @dev is the device indicated by @new_class and
3973 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3975 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3978 const u16 *old_id = dev->id;
3979 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3980 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3982 if (dev->class != new_class) {
3983 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3984 dev->class, new_class);
3988 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3989 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3990 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3991 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3993 if (strcmp(model[0], model[1])) {
3994 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3995 "'%s' != '%s'\n", model[0], model[1]);
3999 if (strcmp(serial[0], serial[1])) {
4000 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
4001 "'%s' != '%s'\n", serial[0], serial[1]);
4009 * ata_dev_reread_id - Re-read IDENTIFY data
4010 * @dev: target ATA device
4011 * @readid_flags: read ID flags
4013 * Re-read IDENTIFY page and make sure @dev is still attached to
4017 * Kernel thread context (may sleep)
4020 * 0 on success, negative errno otherwise
4022 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4024 unsigned int class = dev->class;
4025 u16 *id = (void *)dev->link->ap->sector_buf;
4029 rc = ata_dev_read_id(dev, &class, readid_flags, id);
4033 /* is the device still there? */
4034 if (!ata_dev_same_device(dev, class, id))
4037 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4042 * ata_dev_revalidate - Revalidate ATA device
4043 * @dev: device to revalidate
4044 * @new_class: new class code
4045 * @readid_flags: read ID flags
4047 * Re-read IDENTIFY page, make sure @dev is still attached to the
4048 * port and reconfigure it according to the new IDENTIFY page.
4051 * Kernel thread context (may sleep)
4054 * 0 on success, negative errno otherwise
4056 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4057 unsigned int readid_flags)
4059 u64 n_sectors = dev->n_sectors;
4062 if (!ata_dev_enabled(dev))
4065 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4066 if (ata_class_enabled(new_class) &&
4067 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
4068 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
4069 dev->class, new_class);
4075 rc = ata_dev_reread_id(dev, readid_flags);
4079 /* configure device according to the new ID */
4080 rc = ata_dev_configure(dev);
4084 /* verify n_sectors hasn't changed */
4085 if (dev->class == ATA_DEV_ATA && n_sectors &&
4086 dev->n_sectors != n_sectors) {
4087 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
4089 (unsigned long long)n_sectors,
4090 (unsigned long long)dev->n_sectors);
4092 /* restore original n_sectors */
4093 dev->n_sectors = n_sectors;
4102 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4106 struct ata_blacklist_entry {
4107 const char *model_num;
4108 const char *model_rev;
4109 unsigned long horkage;
4112 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4113 /* Devices with DMA related problems under Linux */
4114 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4115 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4116 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4117 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4118 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4119 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4120 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4121 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4122 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4123 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
4124 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
4125 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4126 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4127 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4128 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4129 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4130 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
4131 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
4132 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4133 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4134 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4135 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4136 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4137 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4138 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4139 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4140 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4141 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4142 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4143 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4144 /* Odd clown on sil3726/4726 PMPs */
4145 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
4146 ATA_HORKAGE_SKIP_PM },
4148 /* Weird ATAPI devices */
4149 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4151 /* Devices we expect to fail diagnostics */
4153 /* Devices where NCQ should be avoided */
4155 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4156 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4157 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4158 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4160 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4161 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4162 { "HITACHI HDS7250SASUN500G*", NULL, ATA_HORKAGE_NONCQ },
4163 { "HITACHI HDS7225SBSUN250G*", NULL, ATA_HORKAGE_NONCQ },
4164 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4165 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4167 /* Blacklist entries taken from Silicon Image 3124/3132
4168 Windows driver .inf file - also several Linux problem reports */
4169 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4170 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4171 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4173 /* devices which puke on READ_NATIVE_MAX */
4174 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4175 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4176 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4177 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4179 /* Devices which report 1 sector over size HPA */
4180 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4181 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4183 /* Devices which get the IVB wrong */
4184 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4185 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
4186 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
4187 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
4188 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
4194 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4200 * check for trailing wildcard: *\0
4202 p = strchr(patt, wildchar);
4203 if (p && ((*(p + 1)) == 0))
4214 return strncmp(patt, name, len);
4217 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4219 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4220 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4221 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4223 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4224 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4226 while (ad->model_num) {
4227 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4228 if (ad->model_rev == NULL)
4230 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4238 static int ata_dma_blacklisted(const struct ata_device *dev)
4240 /* We don't support polling DMA.
4241 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4242 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4244 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4245 (dev->flags & ATA_DFLAG_CDB_INTR))
4247 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4251 * ata_is_40wire - check drive side detection
4254 * Perform drive side detection decoding, allowing for device vendors
4255 * who can't follow the documentation.
4258 static int ata_is_40wire(struct ata_device *dev)
4260 if (dev->horkage & ATA_HORKAGE_IVB)
4261 return ata_drive_40wire_relaxed(dev->id);
4262 return ata_drive_40wire(dev->id);
4266 * ata_dev_xfermask - Compute supported xfermask of the given device
4267 * @dev: Device to compute xfermask for
4269 * Compute supported xfermask of @dev and store it in
4270 * dev->*_mask. This function is responsible for applying all
4271 * known limits including host controller limits, device
4277 static void ata_dev_xfermask(struct ata_device *dev)
4279 struct ata_link *link = dev->link;
4280 struct ata_port *ap = link->ap;
4281 struct ata_host *host = ap->host;
4282 unsigned long xfer_mask;
4284 /* controller modes available */
4285 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4286 ap->mwdma_mask, ap->udma_mask);
4288 /* drive modes available */
4289 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4290 dev->mwdma_mask, dev->udma_mask);
4291 xfer_mask &= ata_id_xfermask(dev->id);
4294 * CFA Advanced TrueIDE timings are not allowed on a shared
4297 if (ata_dev_pair(dev)) {
4298 /* No PIO5 or PIO6 */
4299 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4300 /* No MWDMA3 or MWDMA 4 */
4301 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4304 if (ata_dma_blacklisted(dev)) {
4305 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4306 ata_dev_printk(dev, KERN_WARNING,
4307 "device is on DMA blacklist, disabling DMA\n");
4310 if ((host->flags & ATA_HOST_SIMPLEX) &&
4311 host->simplex_claimed && host->simplex_claimed != ap) {
4312 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4313 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4314 "other device, disabling DMA\n");
4317 if (ap->flags & ATA_FLAG_NO_IORDY)
4318 xfer_mask &= ata_pio_mask_no_iordy(dev);
4320 if (ap->ops->mode_filter)
4321 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4323 /* Apply cable rule here. Don't apply it early because when
4324 * we handle hot plug the cable type can itself change.
4325 * Check this last so that we know if the transfer rate was
4326 * solely limited by the cable.
4327 * Unknown or 80 wire cables reported host side are checked
4328 * drive side as well. Cases where we know a 40wire cable
4329 * is used safely for 80 are not checked here.
4331 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4332 /* UDMA/44 or higher would be available */
4333 if ((ap->cbl == ATA_CBL_PATA40) ||
4334 (ata_is_40wire(dev) &&
4335 (ap->cbl == ATA_CBL_PATA_UNK ||
4336 ap->cbl == ATA_CBL_PATA80))) {
4337 ata_dev_printk(dev, KERN_WARNING,
4338 "limited to UDMA/33 due to 40-wire cable\n");
4339 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4342 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4343 &dev->mwdma_mask, &dev->udma_mask);
4347 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4348 * @dev: Device to which command will be sent
4350 * Issue SET FEATURES - XFER MODE command to device @dev
4354 * PCI/etc. bus probe sem.
4357 * 0 on success, AC_ERR_* mask otherwise.
4360 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4362 struct ata_taskfile tf;
4363 unsigned int err_mask;
4365 /* set up set-features taskfile */
4366 DPRINTK("set features - xfer mode\n");
4368 /* Some controllers and ATAPI devices show flaky interrupt
4369 * behavior after setting xfer mode. Use polling instead.
4371 ata_tf_init(dev, &tf);
4372 tf.command = ATA_CMD_SET_FEATURES;
4373 tf.feature = SETFEATURES_XFER;
4374 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4375 tf.protocol = ATA_PROT_NODATA;
4376 tf.nsect = dev->xfer_mode;
4378 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4380 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4384 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4385 * @dev: Device to which command will be sent
4386 * @enable: Whether to enable or disable the feature
4387 * @feature: The sector count represents the feature to set
4389 * Issue SET FEATURES - SATA FEATURES command to device @dev
4390 * on port @ap with sector count
4393 * PCI/etc. bus probe sem.
4396 * 0 on success, AC_ERR_* mask otherwise.
4398 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4401 struct ata_taskfile tf;
4402 unsigned int err_mask;
4404 /* set up set-features taskfile */
4405 DPRINTK("set features - SATA features\n");
4407 ata_tf_init(dev, &tf);
4408 tf.command = ATA_CMD_SET_FEATURES;
4409 tf.feature = enable;
4410 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4411 tf.protocol = ATA_PROT_NODATA;
4414 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4416 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4421 * ata_dev_init_params - Issue INIT DEV PARAMS command
4422 * @dev: Device to which command will be sent
4423 * @heads: Number of heads (taskfile parameter)
4424 * @sectors: Number of sectors (taskfile parameter)
4427 * Kernel thread context (may sleep)
4430 * 0 on success, AC_ERR_* mask otherwise.
4432 static unsigned int ata_dev_init_params(struct ata_device *dev,
4433 u16 heads, u16 sectors)
4435 struct ata_taskfile tf;
4436 unsigned int err_mask;
4438 /* Number of sectors per track 1-255. Number of heads 1-16 */
4439 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4440 return AC_ERR_INVALID;
4442 /* set up init dev params taskfile */
4443 DPRINTK("init dev params \n");
4445 ata_tf_init(dev, &tf);
4446 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4447 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4448 tf.protocol = ATA_PROT_NODATA;
4450 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4452 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4453 /* A clean abort indicates an original or just out of spec drive
4454 and we should continue as we issue the setup based on the
4455 drive reported working geometry */
4456 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4459 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4464 * ata_sg_clean - Unmap DMA memory associated with command
4465 * @qc: Command containing DMA memory to be released
4467 * Unmap all mapped DMA memory associated with this command.
4470 * spin_lock_irqsave(host lock)
4472 void ata_sg_clean(struct ata_queued_cmd *qc)
4474 struct ata_port *ap = qc->ap;
4475 struct scatterlist *sg = qc->__sg;
4476 int dir = qc->dma_dir;
4477 void *pad_buf = NULL;
4479 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
4480 WARN_ON(sg == NULL);
4482 if (qc->flags & ATA_QCFLAG_SINGLE)
4483 WARN_ON(qc->n_elem > 1);
4485 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4487 /* if we padded the buffer out to 32-bit bound, and data
4488 * xfer direction is from-device, we must copy from the
4489 * pad buffer back into the supplied buffer
4491 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4492 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4494 if (qc->flags & ATA_QCFLAG_SG) {
4496 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4497 /* restore last sg */
4498 sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
4500 struct scatterlist *psg = &qc->pad_sgent;
4501 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4502 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4503 kunmap_atomic(addr, KM_IRQ0);
4507 dma_unmap_single(ap->dev,
4508 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4511 sg->length += qc->pad_len;
4513 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4514 pad_buf, qc->pad_len);
4517 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4522 * ata_fill_sg - Fill PCI IDE PRD table
4523 * @qc: Metadata associated with taskfile to be transferred
4525 * Fill PCI IDE PRD (scatter-gather) table with segments
4526 * associated with the current disk command.
4529 * spin_lock_irqsave(host lock)
4532 static void ata_fill_sg(struct ata_queued_cmd *qc)
4534 struct ata_port *ap = qc->ap;
4535 struct scatterlist *sg;
4538 WARN_ON(qc->__sg == NULL);
4539 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4542 ata_for_each_sg(sg, qc) {
4546 /* determine if physical DMA addr spans 64K boundary.
4547 * Note h/w doesn't support 64-bit, so we unconditionally
4548 * truncate dma_addr_t to u32.
4550 addr = (u32) sg_dma_address(sg);
4551 sg_len = sg_dma_len(sg);
4554 offset = addr & 0xffff;
4556 if ((offset + sg_len) > 0x10000)
4557 len = 0x10000 - offset;
4559 ap->prd[idx].addr = cpu_to_le32(addr);
4560 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4561 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4570 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4574 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4575 * @qc: Metadata associated with taskfile to be transferred
4577 * Fill PCI IDE PRD (scatter-gather) table with segments
4578 * associated with the current disk command. Perform the fill
4579 * so that we avoid writing any length 64K records for
4580 * controllers that don't follow the spec.
4583 * spin_lock_irqsave(host lock)
4586 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4588 struct ata_port *ap = qc->ap;
4589 struct scatterlist *sg;
4592 WARN_ON(qc->__sg == NULL);
4593 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4596 ata_for_each_sg(sg, qc) {
4598 u32 sg_len, len, blen;
4600 /* determine if physical DMA addr spans 64K boundary.
4601 * Note h/w doesn't support 64-bit, so we unconditionally
4602 * truncate dma_addr_t to u32.
4604 addr = (u32) sg_dma_address(sg);
4605 sg_len = sg_dma_len(sg);
4608 offset = addr & 0xffff;
4610 if ((offset + sg_len) > 0x10000)
4611 len = 0x10000 - offset;
4613 blen = len & 0xffff;
4614 ap->prd[idx].addr = cpu_to_le32(addr);
4616 /* Some PATA chipsets like the CS5530 can't
4617 cope with 0x0000 meaning 64K as the spec says */
4618 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4620 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4622 ap->prd[idx].flags_len = cpu_to_le32(blen);
4623 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4632 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4636 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4637 * @qc: Metadata associated with taskfile to check
4639 * Allow low-level driver to filter ATA PACKET commands, returning
4640 * a status indicating whether or not it is OK to use DMA for the
4641 * supplied PACKET command.
4644 * spin_lock_irqsave(host lock)
4646 * RETURNS: 0 when ATAPI DMA can be used
4649 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4651 struct ata_port *ap = qc->ap;
4653 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4654 * few ATAPI devices choke on such DMA requests.
4656 if (unlikely(qc->nbytes & 15))
4659 if (ap->ops->check_atapi_dma)
4660 return ap->ops->check_atapi_dma(qc);
4666 * atapi_qc_may_overflow - Check whether data transfer may overflow
4667 * @qc: ATA command in question
4669 * ATAPI commands which transfer variable length data to host
4670 * might overflow due to application error or hardare bug. This
4671 * function checks whether overflow should be drained and ignored
4678 * 1 if @qc may overflow; otherwise, 0.
4680 static int atapi_qc_may_overflow(struct ata_queued_cmd *qc)
4682 if (qc->tf.protocol != ATA_PROT_ATAPI &&
4683 qc->tf.protocol != ATA_PROT_ATAPI_DMA)
4686 if (qc->tf.flags & ATA_TFLAG_WRITE)
4689 switch (qc->cdb[0]) {
4695 case GPCMD_READ_CD_MSF:
4703 * ata_std_qc_defer - Check whether a qc needs to be deferred
4704 * @qc: ATA command in question
4706 * Non-NCQ commands cannot run with any other command, NCQ or
4707 * not. As upper layer only knows the queue depth, we are
4708 * responsible for maintaining exclusion. This function checks
4709 * whether a new command @qc can be issued.
4712 * spin_lock_irqsave(host lock)
4715 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4717 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4719 struct ata_link *link = qc->dev->link;
4721 if (qc->tf.protocol == ATA_PROT_NCQ) {
4722 if (!ata_tag_valid(link->active_tag))
4725 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4729 return ATA_DEFER_LINK;
4733 * ata_qc_prep - Prepare taskfile for submission
4734 * @qc: Metadata associated with taskfile to be prepared
4736 * Prepare ATA taskfile for submission.
4739 * spin_lock_irqsave(host lock)
4741 void ata_qc_prep(struct ata_queued_cmd *qc)
4743 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4750 * ata_dumb_qc_prep - Prepare taskfile for submission
4751 * @qc: Metadata associated with taskfile to be prepared
4753 * Prepare ATA taskfile for submission.
4756 * spin_lock_irqsave(host lock)
4758 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4760 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4763 ata_fill_sg_dumb(qc);
4766 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4769 * ata_sg_init_one - Associate command with memory buffer
4770 * @qc: Command to be associated
4771 * @buf: Memory buffer
4772 * @buflen: Length of memory buffer, in bytes.
4774 * Initialize the data-related elements of queued_cmd @qc
4775 * to point to a single memory buffer, @buf of byte length @buflen.
4778 * spin_lock_irqsave(host lock)
4781 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4783 qc->flags |= ATA_QCFLAG_SINGLE;
4785 qc->__sg = &qc->sgent;
4787 qc->orig_n_elem = 1;
4789 qc->nbytes = buflen;
4790 qc->cursg = qc->__sg;
4792 sg_init_one(&qc->sgent, buf, buflen);
4796 * ata_sg_init - Associate command with scatter-gather table.
4797 * @qc: Command to be associated
4798 * @sg: Scatter-gather table.
4799 * @n_elem: Number of elements in s/g table.
4801 * Initialize the data-related elements of queued_cmd @qc
4802 * to point to a scatter-gather table @sg, containing @n_elem
4806 * spin_lock_irqsave(host lock)
4809 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4810 unsigned int n_elem)
4812 qc->flags |= ATA_QCFLAG_SG;
4814 qc->n_elem = n_elem;
4815 qc->orig_n_elem = n_elem;
4816 qc->cursg = qc->__sg;
4820 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4821 * @qc: Command with memory buffer to be mapped.
4823 * DMA-map the memory buffer associated with queued_cmd @qc.
4826 * spin_lock_irqsave(host lock)
4829 * Zero on success, negative on error.
4832 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4834 struct ata_port *ap = qc->ap;
4835 int dir = qc->dma_dir;
4836 struct scatterlist *sg = qc->__sg;
4837 dma_addr_t dma_address;
4840 /* we must lengthen transfers to end on a 32-bit boundary */
4841 qc->pad_len = sg->length & 3;
4843 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4844 struct scatterlist *psg = &qc->pad_sgent;
4846 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4848 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4850 if (qc->tf.flags & ATA_TFLAG_WRITE)
4851 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4854 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4855 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4857 sg->length -= qc->pad_len;
4858 if (sg->length == 0)
4861 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4862 sg->length, qc->pad_len);
4870 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4872 if (dma_mapping_error(dma_address)) {
4874 sg->length += qc->pad_len;
4878 sg_dma_address(sg) = dma_address;
4879 sg_dma_len(sg) = sg->length;
4882 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4883 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4889 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4890 * @qc: Command with scatter-gather table to be mapped.
4892 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4895 * spin_lock_irqsave(host lock)
4898 * Zero on success, negative on error.
4902 static int ata_sg_setup(struct ata_queued_cmd *qc)
4904 struct ata_port *ap = qc->ap;
4905 struct scatterlist *sg = qc->__sg;
4906 struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
4907 int n_elem, pre_n_elem, dir, trim_sg = 0;
4909 VPRINTK("ENTER, ata%u\n", ap->print_id);
4910 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4912 /* we must lengthen transfers to end on a 32-bit boundary */
4913 qc->pad_len = lsg->length & 3;
4915 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4916 struct scatterlist *psg = &qc->pad_sgent;
4917 unsigned int offset;
4919 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4921 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4924 * psg->page/offset are used to copy to-be-written
4925 * data in this function or read data in ata_sg_clean.
4927 offset = lsg->offset + lsg->length - qc->pad_len;
4928 sg_init_table(psg, 1);
4929 sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT),
4930 qc->pad_len, offset_in_page(offset));
4932 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4933 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4934 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4935 kunmap_atomic(addr, KM_IRQ0);
4938 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4939 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4941 lsg->length -= qc->pad_len;
4942 if (lsg->length == 0)
4945 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4946 qc->n_elem - 1, lsg->length, qc->pad_len);
4949 pre_n_elem = qc->n_elem;
4950 if (trim_sg && pre_n_elem)
4959 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4961 /* restore last sg */
4962 lsg->length += qc->pad_len;
4966 DPRINTK("%d sg elements mapped\n", n_elem);
4969 qc->n_elem = n_elem;
4975 * swap_buf_le16 - swap halves of 16-bit words in place
4976 * @buf: Buffer to swap
4977 * @buf_words: Number of 16-bit words in buffer.
4979 * Swap halves of 16-bit words if needed to convert from
4980 * little-endian byte order to native cpu byte order, or
4984 * Inherited from caller.
4986 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4991 for (i = 0; i < buf_words; i++)
4992 buf[i] = le16_to_cpu(buf[i]);
4993 #endif /* __BIG_ENDIAN */
4997 * ata_data_xfer - Transfer data by PIO
4998 * @adev: device to target
5000 * @buflen: buffer length
5001 * @write_data: read/write
5003 * Transfer data from/to the device data register by PIO.
5006 * Inherited from caller.
5008 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
5009 unsigned int buflen, int write_data)
5011 struct ata_port *ap = adev->link->ap;
5012 unsigned int words = buflen >> 1;
5014 /* Transfer multiple of 2 bytes */
5016 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
5018 ioread16_rep(ap->ioaddr.data_addr, buf, words);
5020 /* Transfer trailing 1 byte, if any. */
5021 if (unlikely(buflen & 0x01)) {
5022 u16 align_buf[1] = { 0 };
5023 unsigned char *trailing_buf = buf + buflen - 1;
5026 memcpy(align_buf, trailing_buf, 1);
5027 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
5029 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
5030 memcpy(trailing_buf, align_buf, 1);
5036 * ata_data_xfer_noirq - Transfer data by PIO
5037 * @adev: device to target
5039 * @buflen: buffer length
5040 * @write_data: read/write
5042 * Transfer data from/to the device data register by PIO. Do the
5043 * transfer with interrupts disabled.
5046 * Inherited from caller.
5048 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
5049 unsigned int buflen, int write_data)
5051 unsigned long flags;
5052 local_irq_save(flags);
5053 ata_data_xfer(adev, buf, buflen, write_data);
5054 local_irq_restore(flags);
5059 * ata_pio_sector - Transfer a sector of data.
5060 * @qc: Command on going
5062 * Transfer qc->sect_size bytes of data from/to the ATA device.
5065 * Inherited from caller.
5068 static void ata_pio_sector(struct ata_queued_cmd *qc)
5070 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5071 struct ata_port *ap = qc->ap;
5073 unsigned int offset;
5076 if (qc->curbytes == qc->nbytes - qc->sect_size)
5077 ap->hsm_task_state = HSM_ST_LAST;
5079 page = sg_page(qc->cursg);
5080 offset = qc->cursg->offset + qc->cursg_ofs;
5082 /* get the current page and offset */
5083 page = nth_page(page, (offset >> PAGE_SHIFT));
5084 offset %= PAGE_SIZE;
5086 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5088 if (PageHighMem(page)) {
5089 unsigned long flags;
5091 /* FIXME: use a bounce buffer */
5092 local_irq_save(flags);
5093 buf = kmap_atomic(page, KM_IRQ0);
5095 /* do the actual data transfer */
5096 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5098 kunmap_atomic(buf, KM_IRQ0);
5099 local_irq_restore(flags);
5101 buf = page_address(page);
5102 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5105 qc->curbytes += qc->sect_size;
5106 qc->cursg_ofs += qc->sect_size;
5108 if (qc->cursg_ofs == qc->cursg->length) {
5109 qc->cursg = sg_next(qc->cursg);
5115 * ata_pio_sectors - Transfer one or many sectors.
5116 * @qc: Command on going
5118 * Transfer one or many sectors of data from/to the
5119 * ATA device for the DRQ request.
5122 * Inherited from caller.
5125 static void ata_pio_sectors(struct ata_queued_cmd *qc)
5127 if (is_multi_taskfile(&qc->tf)) {
5128 /* READ/WRITE MULTIPLE */
5131 WARN_ON(qc->dev->multi_count == 0);
5133 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
5134 qc->dev->multi_count);
5140 ata_altstatus(qc->ap); /* flush */
5144 * atapi_send_cdb - Write CDB bytes to hardware
5145 * @ap: Port to which ATAPI device is attached.
5146 * @qc: Taskfile currently active
5148 * When device has indicated its readiness to accept
5149 * a CDB, this function is called. Send the CDB.
5155 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
5158 DPRINTK("send cdb\n");
5159 WARN_ON(qc->dev->cdb_len < 12);
5161 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
5162 ata_altstatus(ap); /* flush */
5164 switch (qc->tf.protocol) {
5165 case ATA_PROT_ATAPI:
5166 ap->hsm_task_state = HSM_ST;
5168 case ATA_PROT_ATAPI_NODATA:
5169 ap->hsm_task_state = HSM_ST_LAST;
5171 case ATA_PROT_ATAPI_DMA:
5172 ap->hsm_task_state = HSM_ST_LAST;
5173 /* initiate bmdma */
5174 ap->ops->bmdma_start(qc);
5180 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
5181 * @qc: Command on going
5182 * @bytes: number of bytes
5184 * Transfer Transfer data from/to the ATAPI device.
5187 * Inherited from caller.
5190 static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
5192 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5193 struct ata_port *ap = qc->ap;
5194 struct ata_eh_info *ehi = &qc->dev->link->eh_info;
5195 struct scatterlist *sg;
5198 unsigned int offset, count;
5202 if (unlikely(!sg)) {
5204 * The end of qc->sg is reached and the device expects
5205 * more data to transfer. In order not to overrun qc->sg
5206 * and fulfill length specified in the byte count register,
5207 * - for read case, discard trailing data from the device
5208 * - for write case, padding zero data to the device
5210 u16 pad_buf[1] = { 0 };
5213 if (bytes > qc->curbytes - qc->nbytes + ATAPI_MAX_DRAIN) {
5214 ata_ehi_push_desc(ehi, "too much trailing data "
5215 "buf=%u cur=%u bytes=%u",
5216 qc->nbytes, qc->curbytes, bytes);
5220 /* overflow is exptected for misc ATAPI commands */
5221 if (bytes && !atapi_qc_may_overflow(qc))
5222 ata_dev_printk(qc->dev, KERN_WARNING, "ATAPI %u bytes "
5223 "trailing data (cdb=%02x nbytes=%u)\n",
5224 bytes, qc->cdb[0], qc->nbytes);
5226 for (i = 0; i < (bytes + 1) / 2; i++)
5227 ap->ops->data_xfer(qc->dev, (unsigned char *)pad_buf, 2, do_write);
5229 qc->curbytes += bytes;
5235 offset = sg->offset + qc->cursg_ofs;
5237 /* get the current page and offset */
5238 page = nth_page(page, (offset >> PAGE_SHIFT));
5239 offset %= PAGE_SIZE;
5241 /* don't overrun current sg */
5242 count = min(sg->length - qc->cursg_ofs, bytes);
5244 /* don't cross page boundaries */
5245 count = min(count, (unsigned int)PAGE_SIZE - offset);
5247 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5249 if (PageHighMem(page)) {
5250 unsigned long flags;
5252 /* FIXME: use bounce buffer */
5253 local_irq_save(flags);
5254 buf = kmap_atomic(page, KM_IRQ0);
5256 /* do the actual data transfer */
5257 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5259 kunmap_atomic(buf, KM_IRQ0);
5260 local_irq_restore(flags);
5262 buf = page_address(page);
5263 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5267 if ((count & 1) && bytes)
5269 qc->curbytes += count;
5270 qc->cursg_ofs += count;
5272 if (qc->cursg_ofs == sg->length) {
5273 qc->cursg = sg_next(qc->cursg);
5284 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
5285 * @qc: Command on going
5287 * Transfer Transfer data from/to the ATAPI device.
5290 * Inherited from caller.
5293 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
5295 struct ata_port *ap = qc->ap;
5296 struct ata_device *dev = qc->dev;
5297 unsigned int ireason, bc_lo, bc_hi, bytes;
5298 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
5300 /* Abuse qc->result_tf for temp storage of intermediate TF
5301 * here to save some kernel stack usage.
5302 * For normal completion, qc->result_tf is not relevant. For
5303 * error, qc->result_tf is later overwritten by ata_qc_complete().
5304 * So, the correctness of qc->result_tf is not affected.
5306 ap->ops->tf_read(ap, &qc->result_tf);
5307 ireason = qc->result_tf.nsect;
5308 bc_lo = qc->result_tf.lbam;
5309 bc_hi = qc->result_tf.lbah;
5310 bytes = (bc_hi << 8) | bc_lo;
5312 /* shall be cleared to zero, indicating xfer of data */
5313 if (ireason & (1 << 0))
5316 /* make sure transfer direction matches expected */
5317 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
5318 if (do_write != i_write)
5321 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5323 if (__atapi_pio_bytes(qc, bytes))
5325 ata_altstatus(ap); /* flush */
5330 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5331 qc->err_mask |= AC_ERR_HSM;
5332 ap->hsm_task_state = HSM_ST_ERR;
5336 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
5337 * @ap: the target ata_port
5341 * 1 if ok in workqueue, 0 otherwise.
5344 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
5346 if (qc->tf.flags & ATA_TFLAG_POLLING)
5349 if (ap->hsm_task_state == HSM_ST_FIRST) {
5350 if (qc->tf.protocol == ATA_PROT_PIO &&
5351 (qc->tf.flags & ATA_TFLAG_WRITE))
5354 if (is_atapi_taskfile(&qc->tf) &&
5355 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5363 * ata_hsm_qc_complete - finish a qc running on standard HSM
5364 * @qc: Command to complete
5365 * @in_wq: 1 if called from workqueue, 0 otherwise
5367 * Finish @qc which is running on standard HSM.
5370 * If @in_wq is zero, spin_lock_irqsave(host lock).
5371 * Otherwise, none on entry and grabs host lock.
5373 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
5375 struct ata_port *ap = qc->ap;
5376 unsigned long flags;
5378 if (ap->ops->error_handler) {
5380 spin_lock_irqsave(ap->lock, flags);
5382 /* EH might have kicked in while host lock is
5385 qc = ata_qc_from_tag(ap, qc->tag);
5387 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5388 ap->ops->irq_on(ap);
5389 ata_qc_complete(qc);
5391 ata_port_freeze(ap);
5394 spin_unlock_irqrestore(ap->lock, flags);
5396 if (likely(!(qc->err_mask & AC_ERR_HSM)))
5397 ata_qc_complete(qc);
5399 ata_port_freeze(ap);
5403 spin_lock_irqsave(ap->lock, flags);
5404 ap->ops->irq_on(ap);
5405 ata_qc_complete(qc);
5406 spin_unlock_irqrestore(ap->lock, flags);
5408 ata_qc_complete(qc);
5413 * ata_hsm_move - move the HSM to the next state.
5414 * @ap: the target ata_port
5416 * @status: current device status
5417 * @in_wq: 1 if called from workqueue, 0 otherwise
5420 * 1 when poll next status needed, 0 otherwise.
5422 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
5423 u8 status, int in_wq)
5425 unsigned long flags = 0;
5428 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
5430 /* Make sure ata_qc_issue_prot() does not throw things
5431 * like DMA polling into the workqueue. Notice that
5432 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
5434 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5437 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
5438 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5440 switch (ap->hsm_task_state) {
5442 /* Send first data block or PACKET CDB */
5444 /* If polling, we will stay in the work queue after
5445 * sending the data. Otherwise, interrupt handler
5446 * takes over after sending the data.
5448 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
5450 /* check device status */
5451 if (unlikely((status & ATA_DRQ) == 0)) {
5452 /* handle BSY=0, DRQ=0 as error */
5453 if (likely(status & (ATA_ERR | ATA_DF)))
5454 /* device stops HSM for abort/error */
5455 qc->err_mask |= AC_ERR_DEV;
5457 /* HSM violation. Let EH handle this */
5458 qc->err_mask |= AC_ERR_HSM;
5460 ap->hsm_task_state = HSM_ST_ERR;
5464 /* Device should not ask for data transfer (DRQ=1)
5465 * when it finds something wrong.
5466 * We ignore DRQ here and stop the HSM by
5467 * changing hsm_task_state to HSM_ST_ERR and
5468 * let the EH abort the command or reset the device.
5470 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5471 /* Some ATAPI tape drives forget to clear the ERR bit
5472 * when doing the next command (mostly request sense).
5473 * We ignore ERR here to workaround and proceed sending
5476 if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
5477 ata_port_printk(ap, KERN_WARNING,
5478 "DRQ=1 with device error, "
5479 "dev_stat 0x%X\n", status);
5480 qc->err_mask |= AC_ERR_HSM;
5481 ap->hsm_task_state = HSM_ST_ERR;
5486 /* Send the CDB (atapi) or the first data block (ata pio out).
5487 * During the state transition, interrupt handler shouldn't
5488 * be invoked before the data transfer is complete and
5489 * hsm_task_state is changed. Hence, the following locking.
5492 spin_lock_irqsave(ap->lock, flags);
5494 if (qc->tf.protocol == ATA_PROT_PIO) {
5495 /* PIO data out protocol.
5496 * send first data block.
5499 /* ata_pio_sectors() might change the state
5500 * to HSM_ST_LAST. so, the state is changed here
5501 * before ata_pio_sectors().
5503 ap->hsm_task_state = HSM_ST;
5504 ata_pio_sectors(qc);
5507 atapi_send_cdb(ap, qc);
5510 spin_unlock_irqrestore(ap->lock, flags);
5512 /* if polling, ata_pio_task() handles the rest.
5513 * otherwise, interrupt handler takes over from here.
5518 /* complete command or read/write the data register */
5519 if (qc->tf.protocol == ATA_PROT_ATAPI) {
5520 /* ATAPI PIO protocol */
5521 if ((status & ATA_DRQ) == 0) {
5522 /* No more data to transfer or device error.
5523 * Device error will be tagged in HSM_ST_LAST.
5525 ap->hsm_task_state = HSM_ST_LAST;
5529 /* Device should not ask for data transfer (DRQ=1)
5530 * when it finds something wrong.
5531 * We ignore DRQ here and stop the HSM by
5532 * changing hsm_task_state to HSM_ST_ERR and
5533 * let the EH abort the command or reset the device.
5535 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5536 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
5537 "device error, dev_stat 0x%X\n",
5539 qc->err_mask |= AC_ERR_HSM;
5540 ap->hsm_task_state = HSM_ST_ERR;
5544 atapi_pio_bytes(qc);
5546 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
5547 /* bad ireason reported by device */
5551 /* ATA PIO protocol */
5552 if (unlikely((status & ATA_DRQ) == 0)) {
5553 /* handle BSY=0, DRQ=0 as error */
5554 if (likely(status & (ATA_ERR | ATA_DF)))
5555 /* device stops HSM for abort/error */
5556 qc->err_mask |= AC_ERR_DEV;
5558 /* HSM violation. Let EH handle this.
5559 * Phantom devices also trigger this
5560 * condition. Mark hint.
5562 qc->err_mask |= AC_ERR_HSM |
5565 ap->hsm_task_state = HSM_ST_ERR;
5569 /* For PIO reads, some devices may ask for
5570 * data transfer (DRQ=1) alone with ERR=1.
5571 * We respect DRQ here and transfer one
5572 * block of junk data before changing the
5573 * hsm_task_state to HSM_ST_ERR.
5575 * For PIO writes, ERR=1 DRQ=1 doesn't make
5576 * sense since the data block has been
5577 * transferred to the device.
5579 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5580 /* data might be corrputed */
5581 qc->err_mask |= AC_ERR_DEV;
5583 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5584 ata_pio_sectors(qc);
5585 status = ata_wait_idle(ap);
5588 if (status & (ATA_BUSY | ATA_DRQ))
5589 qc->err_mask |= AC_ERR_HSM;
5591 /* ata_pio_sectors() might change the
5592 * state to HSM_ST_LAST. so, the state
5593 * is changed after ata_pio_sectors().
5595 ap->hsm_task_state = HSM_ST_ERR;
5599 ata_pio_sectors(qc);
5601 if (ap->hsm_task_state == HSM_ST_LAST &&
5602 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5604 status = ata_wait_idle(ap);
5613 if (unlikely(!ata_ok(status))) {
5614 qc->err_mask |= __ac_err_mask(status);
5615 ap->hsm_task_state = HSM_ST_ERR;
5619 /* no more data to transfer */
5620 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5621 ap->print_id, qc->dev->devno, status);
5623 WARN_ON(qc->err_mask);
5625 ap->hsm_task_state = HSM_ST_IDLE;
5627 /* complete taskfile transaction */
5628 ata_hsm_qc_complete(qc, in_wq);
5634 /* make sure qc->err_mask is available to
5635 * know what's wrong and recover
5637 WARN_ON(qc->err_mask == 0);
5639 ap->hsm_task_state = HSM_ST_IDLE;
5641 /* complete taskfile transaction */
5642 ata_hsm_qc_complete(qc, in_wq);
5654 static void ata_pio_task(struct work_struct *work)
5656 struct ata_port *ap =
5657 container_of(work, struct ata_port, port_task.work);
5658 struct ata_queued_cmd *qc = ap->port_task_data;
5663 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5666 * This is purely heuristic. This is a fast path.
5667 * Sometimes when we enter, BSY will be cleared in
5668 * a chk-status or two. If not, the drive is probably seeking
5669 * or something. Snooze for a couple msecs, then
5670 * chk-status again. If still busy, queue delayed work.
5672 status = ata_busy_wait(ap, ATA_BUSY, 5);
5673 if (status & ATA_BUSY) {
5675 status = ata_busy_wait(ap, ATA_BUSY, 10);
5676 if (status & ATA_BUSY) {
5677 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5683 poll_next = ata_hsm_move(ap, qc, status, 1);
5685 /* another command or interrupt handler
5686 * may be running at this point.
5693 * ata_qc_new - Request an available ATA command, for queueing
5694 * @ap: Port associated with device @dev
5695 * @dev: Device from whom we request an available command structure
5701 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5703 struct ata_queued_cmd *qc = NULL;
5706 /* no command while frozen */
5707 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5710 /* the last tag is reserved for internal command. */
5711 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5712 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5713 qc = __ata_qc_from_tag(ap, i);
5724 * ata_qc_new_init - Request an available ATA command, and initialize it
5725 * @dev: Device from whom we request an available command structure
5731 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5733 struct ata_port *ap = dev->link->ap;
5734 struct ata_queued_cmd *qc;
5736 qc = ata_qc_new(ap);
5749 * ata_qc_free - free unused ata_queued_cmd
5750 * @qc: Command to complete
5752 * Designed to free unused ata_queued_cmd object
5753 * in case something prevents using it.
5756 * spin_lock_irqsave(host lock)
5758 void ata_qc_free(struct ata_queued_cmd *qc)
5760 struct ata_port *ap = qc->ap;
5763 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5767 if (likely(ata_tag_valid(tag))) {
5768 qc->tag = ATA_TAG_POISON;
5769 clear_bit(tag, &ap->qc_allocated);
5773 void __ata_qc_complete(struct ata_queued_cmd *qc)
5775 struct ata_port *ap = qc->ap;
5776 struct ata_link *link = qc->dev->link;
5778 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5779 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5781 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5784 /* command should be marked inactive atomically with qc completion */
5785 if (qc->tf.protocol == ATA_PROT_NCQ) {
5786 link->sactive &= ~(1 << qc->tag);
5788 ap->nr_active_links--;
5790 link->active_tag = ATA_TAG_POISON;
5791 ap->nr_active_links--;
5794 /* clear exclusive status */
5795 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5796 ap->excl_link == link))
5797 ap->excl_link = NULL;
5799 /* atapi: mark qc as inactive to prevent the interrupt handler
5800 * from completing the command twice later, before the error handler
5801 * is called. (when rc != 0 and atapi request sense is needed)
5803 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5804 ap->qc_active &= ~(1 << qc->tag);
5806 /* call completion callback */
5807 qc->complete_fn(qc);
5810 static void fill_result_tf(struct ata_queued_cmd *qc)
5812 struct ata_port *ap = qc->ap;
5814 qc->result_tf.flags = qc->tf.flags;
5815 ap->ops->tf_read(ap, &qc->result_tf);
5819 * ata_qc_complete - Complete an active ATA command
5820 * @qc: Command to complete
5821 * @err_mask: ATA Status register contents
5823 * Indicate to the mid and upper layers that an ATA
5824 * command has completed, with either an ok or not-ok status.
5827 * spin_lock_irqsave(host lock)
5829 void ata_qc_complete(struct ata_queued_cmd *qc)
5831 struct ata_port *ap = qc->ap;
5833 /* XXX: New EH and old EH use different mechanisms to
5834 * synchronize EH with regular execution path.
5836 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5837 * Normal execution path is responsible for not accessing a
5838 * failed qc. libata core enforces the rule by returning NULL
5839 * from ata_qc_from_tag() for failed qcs.
5841 * Old EH depends on ata_qc_complete() nullifying completion
5842 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5843 * not synchronize with interrupt handler. Only PIO task is
5846 if (ap->ops->error_handler) {
5847 struct ata_device *dev = qc->dev;
5848 struct ata_eh_info *ehi = &dev->link->eh_info;
5850 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5852 if (unlikely(qc->err_mask))
5853 qc->flags |= ATA_QCFLAG_FAILED;
5855 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5856 if (!ata_tag_internal(qc->tag)) {
5857 /* always fill result TF for failed qc */
5859 ata_qc_schedule_eh(qc);
5864 /* read result TF if requested */
5865 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5868 /* Some commands need post-processing after successful
5871 switch (qc->tf.command) {
5872 case ATA_CMD_SET_FEATURES:
5873 if (qc->tf.feature != SETFEATURES_WC_ON &&
5874 qc->tf.feature != SETFEATURES_WC_OFF)
5877 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5878 case ATA_CMD_SET_MULTI: /* multi_count changed */
5879 /* revalidate device */
5880 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5881 ata_port_schedule_eh(ap);
5885 dev->flags |= ATA_DFLAG_SLEEPING;
5889 __ata_qc_complete(qc);
5891 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5894 /* read result TF if failed or requested */
5895 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5898 __ata_qc_complete(qc);
5903 * ata_qc_complete_multiple - Complete multiple qcs successfully
5904 * @ap: port in question
5905 * @qc_active: new qc_active mask
5906 * @finish_qc: LLDD callback invoked before completing a qc
5908 * Complete in-flight commands. This functions is meant to be
5909 * called from low-level driver's interrupt routine to complete
5910 * requests normally. ap->qc_active and @qc_active is compared
5911 * and commands are completed accordingly.
5914 * spin_lock_irqsave(host lock)
5917 * Number of completed commands on success, -errno otherwise.
5919 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5920 void (*finish_qc)(struct ata_queued_cmd *))
5926 done_mask = ap->qc_active ^ qc_active;
5928 if (unlikely(done_mask & qc_active)) {
5929 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5930 "(%08x->%08x)\n", ap->qc_active, qc_active);
5934 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5935 struct ata_queued_cmd *qc;
5937 if (!(done_mask & (1 << i)))
5940 if ((qc = ata_qc_from_tag(ap, i))) {
5943 ata_qc_complete(qc);
5951 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
5953 struct ata_port *ap = qc->ap;
5955 switch (qc->tf.protocol) {
5958 case ATA_PROT_ATAPI_DMA:
5961 case ATA_PROT_ATAPI:
5963 if (ap->flags & ATA_FLAG_PIO_DMA)
5976 * ata_qc_issue - issue taskfile to device
5977 * @qc: command to issue to device
5979 * Prepare an ATA command to submission to device.
5980 * This includes mapping the data into a DMA-able
5981 * area, filling in the S/G table, and finally
5982 * writing the taskfile to hardware, starting the command.
5985 * spin_lock_irqsave(host lock)
5987 void ata_qc_issue(struct ata_queued_cmd *qc)
5989 struct ata_port *ap = qc->ap;
5990 struct ata_link *link = qc->dev->link;
5992 /* Make sure only one non-NCQ command is outstanding. The
5993 * check is skipped for old EH because it reuses active qc to
5994 * request ATAPI sense.
5996 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5998 if (qc->tf.protocol == ATA_PROT_NCQ) {
5999 WARN_ON(link->sactive & (1 << qc->tag));
6002 ap->nr_active_links++;
6003 link->sactive |= 1 << qc->tag;
6005 WARN_ON(link->sactive);
6007 ap->nr_active_links++;
6008 link->active_tag = qc->tag;
6011 qc->flags |= ATA_QCFLAG_ACTIVE;
6012 ap->qc_active |= 1 << qc->tag;
6014 if (ata_should_dma_map(qc)) {
6015 if (qc->flags & ATA_QCFLAG_SG) {
6016 if (ata_sg_setup(qc))
6018 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
6019 if (ata_sg_setup_one(qc))
6023 qc->flags &= ~ATA_QCFLAG_DMAMAP;
6026 /* if device is sleeping, schedule softreset and abort the link */
6027 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
6028 link->eh_info.action |= ATA_EH_SOFTRESET;
6029 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
6030 ata_link_abort(link);
6034 ap->ops->qc_prep(qc);
6036 qc->err_mask |= ap->ops->qc_issue(qc);
6037 if (unlikely(qc->err_mask))
6042 qc->flags &= ~ATA_QCFLAG_DMAMAP;
6043 qc->err_mask |= AC_ERR_SYSTEM;
6045 ata_qc_complete(qc);
6049 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
6050 * @qc: command to issue to device
6052 * Using various libata functions and hooks, this function
6053 * starts an ATA command. ATA commands are grouped into
6054 * classes called "protocols", and issuing each type of protocol
6055 * is slightly different.
6057 * May be used as the qc_issue() entry in ata_port_operations.
6060 * spin_lock_irqsave(host lock)
6063 * Zero on success, AC_ERR_* mask on failure
6066 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
6068 struct ata_port *ap = qc->ap;
6070 /* Use polling pio if the LLD doesn't handle
6071 * interrupt driven pio and atapi CDB interrupt.
6073 if (ap->flags & ATA_FLAG_PIO_POLLING) {
6074 switch (qc->tf.protocol) {
6076 case ATA_PROT_NODATA:
6077 case ATA_PROT_ATAPI:
6078 case ATA_PROT_ATAPI_NODATA:
6079 qc->tf.flags |= ATA_TFLAG_POLLING;
6081 case ATA_PROT_ATAPI_DMA:
6082 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
6083 /* see ata_dma_blacklisted() */
6091 /* select the device */
6092 ata_dev_select(ap, qc->dev->devno, 1, 0);
6094 /* start the command */
6095 switch (qc->tf.protocol) {
6096 case ATA_PROT_NODATA:
6097 if (qc->tf.flags & ATA_TFLAG_POLLING)
6098 ata_qc_set_polling(qc);
6100 ata_tf_to_host(ap, &qc->tf);
6101 ap->hsm_task_state = HSM_ST_LAST;
6103 if (qc->tf.flags & ATA_TFLAG_POLLING)
6104 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6109 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6111 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6112 ap->ops->bmdma_setup(qc); /* set up bmdma */
6113 ap->ops->bmdma_start(qc); /* initiate bmdma */
6114 ap->hsm_task_state = HSM_ST_LAST;
6118 if (qc->tf.flags & ATA_TFLAG_POLLING)
6119 ata_qc_set_polling(qc);
6121 ata_tf_to_host(ap, &qc->tf);
6123 if (qc->tf.flags & ATA_TFLAG_WRITE) {
6124 /* PIO data out protocol */
6125 ap->hsm_task_state = HSM_ST_FIRST;
6126 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6128 /* always send first data block using
6129 * the ata_pio_task() codepath.
6132 /* PIO data in protocol */
6133 ap->hsm_task_state = HSM_ST;
6135 if (qc->tf.flags & ATA_TFLAG_POLLING)
6136 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6138 /* if polling, ata_pio_task() handles the rest.
6139 * otherwise, interrupt handler takes over from here.
6145 case ATA_PROT_ATAPI:
6146 case ATA_PROT_ATAPI_NODATA:
6147 if (qc->tf.flags & ATA_TFLAG_POLLING)
6148 ata_qc_set_polling(qc);
6150 ata_tf_to_host(ap, &qc->tf);
6152 ap->hsm_task_state = HSM_ST_FIRST;
6154 /* send cdb by polling if no cdb interrupt */
6155 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
6156 (qc->tf.flags & ATA_TFLAG_POLLING))
6157 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6160 case ATA_PROT_ATAPI_DMA:
6161 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6163 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6164 ap->ops->bmdma_setup(qc); /* set up bmdma */
6165 ap->hsm_task_state = HSM_ST_FIRST;
6167 /* send cdb by polling if no cdb interrupt */
6168 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6169 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6174 return AC_ERR_SYSTEM;
6181 * ata_host_intr - Handle host interrupt for given (port, task)
6182 * @ap: Port on which interrupt arrived (possibly...)
6183 * @qc: Taskfile currently active in engine
6185 * Handle host interrupt for given queued command. Currently,
6186 * only DMA interrupts are handled. All other commands are
6187 * handled via polling with interrupts disabled (nIEN bit).
6190 * spin_lock_irqsave(host lock)
6193 * One if interrupt was handled, zero if not (shared irq).
6196 inline unsigned int ata_host_intr(struct ata_port *ap,
6197 struct ata_queued_cmd *qc)
6199 struct ata_eh_info *ehi = &ap->link.eh_info;
6200 u8 status, host_stat = 0;
6202 VPRINTK("ata%u: protocol %d task_state %d\n",
6203 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
6205 /* Check whether we are expecting interrupt in this state */
6206 switch (ap->hsm_task_state) {
6208 /* Some pre-ATAPI-4 devices assert INTRQ
6209 * at this state when ready to receive CDB.
6212 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
6213 * The flag was turned on only for atapi devices.
6214 * No need to check is_atapi_taskfile(&qc->tf) again.
6216 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6220 if (qc->tf.protocol == ATA_PROT_DMA ||
6221 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
6222 /* check status of DMA engine */
6223 host_stat = ap->ops->bmdma_status(ap);
6224 VPRINTK("ata%u: host_stat 0x%X\n",
6225 ap->print_id, host_stat);
6227 /* if it's not our irq... */
6228 if (!(host_stat & ATA_DMA_INTR))
6231 /* before we do anything else, clear DMA-Start bit */
6232 ap->ops->bmdma_stop(qc);
6234 if (unlikely(host_stat & ATA_DMA_ERR)) {
6235 /* error when transfering data to/from memory */
6236 qc->err_mask |= AC_ERR_HOST_BUS;
6237 ap->hsm_task_state = HSM_ST_ERR;
6247 /* check altstatus */
6248 status = ata_altstatus(ap);
6249 if (status & ATA_BUSY)
6252 /* check main status, clearing INTRQ */
6253 status = ata_chk_status(ap);
6254 if (unlikely(status & ATA_BUSY))
6257 /* ack bmdma irq events */
6258 ap->ops->irq_clear(ap);
6260 ata_hsm_move(ap, qc, status, 0);
6262 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
6263 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
6264 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
6266 return 1; /* irq handled */
6269 ap->stats.idle_irq++;
6272 if ((ap->stats.idle_irq % 1000) == 0) {
6274 ap->ops->irq_clear(ap);
6275 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
6279 return 0; /* irq not handled */
6283 * ata_interrupt - Default ATA host interrupt handler
6284 * @irq: irq line (unused)
6285 * @dev_instance: pointer to our ata_host information structure
6287 * Default interrupt handler for PCI IDE devices. Calls
6288 * ata_host_intr() for each port that is not disabled.
6291 * Obtains host lock during operation.
6294 * IRQ_NONE or IRQ_HANDLED.
6297 irqreturn_t ata_interrupt(int irq, void *dev_instance)
6299 struct ata_host *host = dev_instance;
6301 unsigned int handled = 0;
6302 unsigned long flags;
6304 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
6305 spin_lock_irqsave(&host->lock, flags);
6307 for (i = 0; i < host->n_ports; i++) {
6308 struct ata_port *ap;
6310 ap = host->ports[i];
6312 !(ap->flags & ATA_FLAG_DISABLED)) {
6313 struct ata_queued_cmd *qc;
6315 qc = ata_qc_from_tag(ap, ap->link.active_tag);
6316 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6317 (qc->flags & ATA_QCFLAG_ACTIVE))
6318 handled |= ata_host_intr(ap, qc);
6322 spin_unlock_irqrestore(&host->lock, flags);
6324 return IRQ_RETVAL(handled);
6328 * sata_scr_valid - test whether SCRs are accessible
6329 * @link: ATA link to test SCR accessibility for
6331 * Test whether SCRs are accessible for @link.
6337 * 1 if SCRs are accessible, 0 otherwise.
6339 int sata_scr_valid(struct ata_link *link)
6341 struct ata_port *ap = link->ap;
6343 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6347 * sata_scr_read - read SCR register of the specified port
6348 * @link: ATA link to read SCR for
6350 * @val: Place to store read value
6352 * Read SCR register @reg of @link into *@val. This function is
6353 * guaranteed to succeed if @link is ap->link, the cable type of
6354 * the port is SATA and the port implements ->scr_read.
6357 * None if @link is ap->link. Kernel thread context otherwise.
6360 * 0 on success, negative errno on failure.
6362 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6364 if (ata_is_host_link(link)) {
6365 struct ata_port *ap = link->ap;
6367 if (sata_scr_valid(link))
6368 return ap->ops->scr_read(ap, reg, val);
6372 return sata_pmp_scr_read(link, reg, val);
6376 * sata_scr_write - write SCR register of the specified port
6377 * @link: ATA link to write SCR for
6378 * @reg: SCR to write
6379 * @val: value to write
6381 * Write @val to SCR register @reg of @link. This function is
6382 * guaranteed to succeed if @link is ap->link, the cable type of
6383 * the port is SATA and the port implements ->scr_read.
6386 * None if @link is ap->link. Kernel thread context otherwise.
6389 * 0 on success, negative errno on failure.
6391 int sata_scr_write(struct ata_link *link, int reg, u32 val)
6393 if (ata_is_host_link(link)) {
6394 struct ata_port *ap = link->ap;
6396 if (sata_scr_valid(link))
6397 return ap->ops->scr_write(ap, reg, val);
6401 return sata_pmp_scr_write(link, reg, val);
6405 * sata_scr_write_flush - write SCR register of the specified port and flush
6406 * @link: ATA link to write SCR for
6407 * @reg: SCR to write
6408 * @val: value to write
6410 * This function is identical to sata_scr_write() except that this
6411 * function performs flush after writing to the register.
6414 * None if @link is ap->link. Kernel thread context otherwise.
6417 * 0 on success, negative errno on failure.
6419 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6421 if (ata_is_host_link(link)) {
6422 struct ata_port *ap = link->ap;
6425 if (sata_scr_valid(link)) {
6426 rc = ap->ops->scr_write(ap, reg, val);
6428 rc = ap->ops->scr_read(ap, reg, &val);
6434 return sata_pmp_scr_write(link, reg, val);
6438 * ata_link_online - test whether the given link is online
6439 * @link: ATA link to test
6441 * Test whether @link is online. Note that this function returns
6442 * 0 if online status of @link cannot be obtained, so
6443 * ata_link_online(link) != !ata_link_offline(link).
6449 * 1 if the port online status is available and online.
6451 int ata_link_online(struct ata_link *link)
6455 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6456 (sstatus & 0xf) == 0x3)
6462 * ata_link_offline - test whether the given link is offline
6463 * @link: ATA link to test
6465 * Test whether @link is offline. Note that this function
6466 * returns 0 if offline status of @link cannot be obtained, so
6467 * ata_link_online(link) != !ata_link_offline(link).
6473 * 1 if the port offline status is available and offline.
6475 int ata_link_offline(struct ata_link *link)
6479 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6480 (sstatus & 0xf) != 0x3)
6485 int ata_flush_cache(struct ata_device *dev)
6487 unsigned int err_mask;
6490 if (!ata_try_flush_cache(dev))
6493 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
6494 cmd = ATA_CMD_FLUSH_EXT;
6496 cmd = ATA_CMD_FLUSH;
6498 /* This is wrong. On a failed flush we get back the LBA of the lost
6499 sector and we should (assuming it wasn't aborted as unknown) issue
6500 a further flush command to continue the writeback until it
6502 err_mask = ata_do_simple_cmd(dev, cmd);
6504 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
6512 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
6513 unsigned int action, unsigned int ehi_flags,
6516 unsigned long flags;
6519 for (i = 0; i < host->n_ports; i++) {
6520 struct ata_port *ap = host->ports[i];
6521 struct ata_link *link;
6523 /* Previous resume operation might still be in
6524 * progress. Wait for PM_PENDING to clear.
6526 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
6527 ata_port_wait_eh(ap);
6528 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6531 /* request PM ops to EH */
6532 spin_lock_irqsave(ap->lock, flags);
6537 ap->pm_result = &rc;
6540 ap->pflags |= ATA_PFLAG_PM_PENDING;
6541 __ata_port_for_each_link(link, ap) {
6542 link->eh_info.action |= action;
6543 link->eh_info.flags |= ehi_flags;
6546 ata_port_schedule_eh(ap);
6548 spin_unlock_irqrestore(ap->lock, flags);
6550 /* wait and check result */
6552 ata_port_wait_eh(ap);
6553 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6563 * ata_host_suspend - suspend host
6564 * @host: host to suspend
6567 * Suspend @host. Actual operation is performed by EH. This
6568 * function requests EH to perform PM operations and waits for EH
6572 * Kernel thread context (may sleep).
6575 * 0 on success, -errno on failure.
6577 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6582 * disable link pm on all ports before requesting
6585 ata_lpm_enable(host);
6587 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6589 host->dev->power.power_state = mesg;
6594 * ata_host_resume - resume host
6595 * @host: host to resume
6597 * Resume @host. Actual operation is performed by EH. This
6598 * function requests EH to perform PM operations and returns.
6599 * Note that all resume operations are performed parallely.
6602 * Kernel thread context (may sleep).
6604 void ata_host_resume(struct ata_host *host)
6606 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
6607 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
6608 host->dev->power.power_state = PMSG_ON;
6610 /* reenable link pm */
6611 ata_lpm_disable(host);
6616 * ata_port_start - Set port up for dma.
6617 * @ap: Port to initialize
6619 * Called just after data structures for each port are
6620 * initialized. Allocates space for PRD table.
6622 * May be used as the port_start() entry in ata_port_operations.
6625 * Inherited from caller.
6627 int ata_port_start(struct ata_port *ap)
6629 struct device *dev = ap->dev;
6632 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
6637 rc = ata_pad_alloc(ap, dev);
6641 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
6642 (unsigned long long)ap->prd_dma);
6647 * ata_dev_init - Initialize an ata_device structure
6648 * @dev: Device structure to initialize
6650 * Initialize @dev in preparation for probing.
6653 * Inherited from caller.
6655 void ata_dev_init(struct ata_device *dev)
6657 struct ata_link *link = dev->link;
6658 struct ata_port *ap = link->ap;
6659 unsigned long flags;
6661 /* SATA spd limit is bound to the first device */
6662 link->sata_spd_limit = link->hw_sata_spd_limit;
6665 /* High bits of dev->flags are used to record warm plug
6666 * requests which occur asynchronously. Synchronize using
6669 spin_lock_irqsave(ap->lock, flags);
6670 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6672 spin_unlock_irqrestore(ap->lock, flags);
6674 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6675 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6676 dev->pio_mask = UINT_MAX;
6677 dev->mwdma_mask = UINT_MAX;
6678 dev->udma_mask = UINT_MAX;
6682 * ata_link_init - Initialize an ata_link structure
6683 * @ap: ATA port link is attached to
6684 * @link: Link structure to initialize
6685 * @pmp: Port multiplier port number
6690 * Kernel thread context (may sleep)
6692 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6696 /* clear everything except for devices */
6697 memset(link, 0, offsetof(struct ata_link, device[0]));
6701 link->active_tag = ATA_TAG_POISON;
6702 link->hw_sata_spd_limit = UINT_MAX;
6704 /* can't use iterator, ap isn't initialized yet */
6705 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6706 struct ata_device *dev = &link->device[i];
6709 dev->devno = dev - link->device;
6715 * sata_link_init_spd - Initialize link->sata_spd_limit
6716 * @link: Link to configure sata_spd_limit for
6718 * Initialize @link->[hw_]sata_spd_limit to the currently
6722 * Kernel thread context (may sleep).
6725 * 0 on success, -errno on failure.
6727 int sata_link_init_spd(struct ata_link *link)
6732 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
6736 spd = (scontrol >> 4) & 0xf;
6738 link->hw_sata_spd_limit &= (1 << spd) - 1;
6740 link->sata_spd_limit = link->hw_sata_spd_limit;
6746 * ata_port_alloc - allocate and initialize basic ATA port resources
6747 * @host: ATA host this allocated port belongs to
6749 * Allocate and initialize basic ATA port resources.
6752 * Allocate ATA port on success, NULL on failure.
6755 * Inherited from calling layer (may sleep).
6757 struct ata_port *ata_port_alloc(struct ata_host *host)
6759 struct ata_port *ap;
6763 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6767 ap->pflags |= ATA_PFLAG_INITIALIZING;
6768 ap->lock = &host->lock;
6769 ap->flags = ATA_FLAG_DISABLED;
6771 ap->ctl = ATA_DEVCTL_OBS;
6773 ap->dev = host->dev;
6774 ap->last_ctl = 0xFF;
6776 #if defined(ATA_VERBOSE_DEBUG)
6777 /* turn on all debugging levels */
6778 ap->msg_enable = 0x00FF;
6779 #elif defined(ATA_DEBUG)
6780 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6782 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6785 INIT_DELAYED_WORK(&ap->port_task, NULL);
6786 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6787 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6788 INIT_LIST_HEAD(&ap->eh_done_q);
6789 init_waitqueue_head(&ap->eh_wait_q);
6790 init_timer_deferrable(&ap->fastdrain_timer);
6791 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
6792 ap->fastdrain_timer.data = (unsigned long)ap;
6794 ap->cbl = ATA_CBL_NONE;
6796 ata_link_init(ap, &ap->link, 0);
6799 ap->stats.unhandled_irq = 1;
6800 ap->stats.idle_irq = 1;
6805 static void ata_host_release(struct device *gendev, void *res)
6807 struct ata_host *host = dev_get_drvdata(gendev);
6810 for (i = 0; i < host->n_ports; i++) {
6811 struct ata_port *ap = host->ports[i];
6817 scsi_host_put(ap->scsi_host);
6819 kfree(ap->pmp_link);
6821 host->ports[i] = NULL;
6824 dev_set_drvdata(gendev, NULL);
6828 * ata_host_alloc - allocate and init basic ATA host resources
6829 * @dev: generic device this host is associated with
6830 * @max_ports: maximum number of ATA ports associated with this host
6832 * Allocate and initialize basic ATA host resources. LLD calls
6833 * this function to allocate a host, initializes it fully and
6834 * attaches it using ata_host_register().
6836 * @max_ports ports are allocated and host->n_ports is
6837 * initialized to @max_ports. The caller is allowed to decrease
6838 * host->n_ports before calling ata_host_register(). The unused
6839 * ports will be automatically freed on registration.
6842 * Allocate ATA host on success, NULL on failure.
6845 * Inherited from calling layer (may sleep).
6847 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6849 struct ata_host *host;
6855 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6858 /* alloc a container for our list of ATA ports (buses) */
6859 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6860 /* alloc a container for our list of ATA ports (buses) */
6861 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6865 devres_add(dev, host);
6866 dev_set_drvdata(dev, host);
6868 spin_lock_init(&host->lock);
6870 host->n_ports = max_ports;
6872 /* allocate ports bound to this host */
6873 for (i = 0; i < max_ports; i++) {
6874 struct ata_port *ap;
6876 ap = ata_port_alloc(host);
6881 host->ports[i] = ap;
6884 devres_remove_group(dev, NULL);
6888 devres_release_group(dev, NULL);
6893 * ata_host_alloc_pinfo - alloc host and init with port_info array
6894 * @dev: generic device this host is associated with
6895 * @ppi: array of ATA port_info to initialize host with
6896 * @n_ports: number of ATA ports attached to this host
6898 * Allocate ATA host and initialize with info from @ppi. If NULL
6899 * terminated, @ppi may contain fewer entries than @n_ports. The
6900 * last entry will be used for the remaining ports.
6903 * Allocate ATA host on success, NULL on failure.
6906 * Inherited from calling layer (may sleep).
6908 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6909 const struct ata_port_info * const * ppi,
6912 const struct ata_port_info *pi;
6913 struct ata_host *host;
6916 host = ata_host_alloc(dev, n_ports);
6920 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6921 struct ata_port *ap = host->ports[i];
6926 ap->pio_mask = pi->pio_mask;
6927 ap->mwdma_mask = pi->mwdma_mask;
6928 ap->udma_mask = pi->udma_mask;
6929 ap->flags |= pi->flags;
6930 ap->link.flags |= pi->link_flags;
6931 ap->ops = pi->port_ops;
6933 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6934 host->ops = pi->port_ops;
6935 if (!host->private_data && pi->private_data)
6936 host->private_data = pi->private_data;
6942 static void ata_host_stop(struct device *gendev, void *res)
6944 struct ata_host *host = dev_get_drvdata(gendev);
6947 WARN_ON(!(host->flags & ATA_HOST_STARTED));
6949 for (i = 0; i < host->n_ports; i++) {
6950 struct ata_port *ap = host->ports[i];
6952 if (ap->ops->port_stop)
6953 ap->ops->port_stop(ap);
6956 if (host->ops->host_stop)
6957 host->ops->host_stop(host);
6961 * ata_host_start - start and freeze ports of an ATA host
6962 * @host: ATA host to start ports for
6964 * Start and then freeze ports of @host. Started status is
6965 * recorded in host->flags, so this function can be called
6966 * multiple times. Ports are guaranteed to get started only
6967 * once. If host->ops isn't initialized yet, its set to the
6968 * first non-dummy port ops.
6971 * Inherited from calling layer (may sleep).
6974 * 0 if all ports are started successfully, -errno otherwise.
6976 int ata_host_start(struct ata_host *host)
6979 void *start_dr = NULL;
6982 if (host->flags & ATA_HOST_STARTED)
6985 for (i = 0; i < host->n_ports; i++) {
6986 struct ata_port *ap = host->ports[i];
6988 if (!host->ops && !ata_port_is_dummy(ap))
6989 host->ops = ap->ops;
6991 if (ap->ops->port_stop)
6995 if (host->ops->host_stop)
6999 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
7004 for (i = 0; i < host->n_ports; i++) {
7005 struct ata_port *ap = host->ports[i];
7007 if (ap->ops->port_start) {
7008 rc = ap->ops->port_start(ap);
7011 dev_printk(KERN_ERR, host->dev,
7012 "failed to start port %d "
7013 "(errno=%d)\n", i, rc);
7017 ata_eh_freeze_port(ap);
7021 devres_add(host->dev, start_dr);
7022 host->flags |= ATA_HOST_STARTED;
7027 struct ata_port *ap = host->ports[i];
7029 if (ap->ops->port_stop)
7030 ap->ops->port_stop(ap);
7032 devres_free(start_dr);
7037 * ata_sas_host_init - Initialize a host struct
7038 * @host: host to initialize
7039 * @dev: device host is attached to
7040 * @flags: host flags
7044 * PCI/etc. bus probe sem.
7047 /* KILLME - the only user left is ipr */
7048 void ata_host_init(struct ata_host *host, struct device *dev,
7049 unsigned long flags, const struct ata_port_operations *ops)
7051 spin_lock_init(&host->lock);
7053 host->flags = flags;
7058 * ata_host_register - register initialized ATA host
7059 * @host: ATA host to register
7060 * @sht: template for SCSI host
7062 * Register initialized ATA host. @host is allocated using
7063 * ata_host_alloc() and fully initialized by LLD. This function
7064 * starts ports, registers @host with ATA and SCSI layers and
7065 * probe registered devices.
7068 * Inherited from calling layer (may sleep).
7071 * 0 on success, -errno otherwise.
7073 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
7077 /* host must have been started */
7078 if (!(host->flags & ATA_HOST_STARTED)) {
7079 dev_printk(KERN_ERR, host->dev,
7080 "BUG: trying to register unstarted host\n");
7085 /* Blow away unused ports. This happens when LLD can't
7086 * determine the exact number of ports to allocate at
7089 for (i = host->n_ports; host->ports[i]; i++)
7090 kfree(host->ports[i]);
7092 /* give ports names and add SCSI hosts */
7093 for (i = 0; i < host->n_ports; i++)
7094 host->ports[i]->print_id = ata_print_id++;
7096 rc = ata_scsi_add_hosts(host, sht);
7100 /* associate with ACPI nodes */
7101 ata_acpi_associate(host);
7103 /* set cable, sata_spd_limit and report */
7104 for (i = 0; i < host->n_ports; i++) {
7105 struct ata_port *ap = host->ports[i];
7106 unsigned long xfer_mask;
7108 /* set SATA cable type if still unset */
7109 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
7110 ap->cbl = ATA_CBL_SATA;
7112 /* init sata_spd_limit to the current value */
7113 sata_link_init_spd(&ap->link);
7115 /* print per-port info to dmesg */
7116 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
7119 if (!ata_port_is_dummy(ap)) {
7120 ata_port_printk(ap, KERN_INFO,
7121 "%cATA max %s %s\n",
7122 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
7123 ata_mode_string(xfer_mask),
7124 ap->link.eh_info.desc);
7125 ata_ehi_clear_desc(&ap->link.eh_info);
7127 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
7130 /* perform each probe synchronously */
7131 DPRINTK("probe begin\n");
7132 for (i = 0; i < host->n_ports; i++) {
7133 struct ata_port *ap = host->ports[i];
7137 if (ap->ops->error_handler) {
7138 struct ata_eh_info *ehi = &ap->link.eh_info;
7139 unsigned long flags;
7143 /* kick EH for boot probing */
7144 spin_lock_irqsave(ap->lock, flags);
7147 (1 << ata_link_max_devices(&ap->link)) - 1;
7148 ehi->action |= ATA_EH_SOFTRESET;
7149 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
7151 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
7152 ap->pflags |= ATA_PFLAG_LOADING;
7153 ata_port_schedule_eh(ap);
7155 spin_unlock_irqrestore(ap->lock, flags);
7157 /* wait for EH to finish */
7158 ata_port_wait_eh(ap);
7160 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
7161 rc = ata_bus_probe(ap);
7162 DPRINTK("ata%u: bus probe end\n", ap->print_id);
7165 /* FIXME: do something useful here?
7166 * Current libata behavior will
7167 * tear down everything when
7168 * the module is removed
7169 * or the h/w is unplugged.
7175 /* probes are done, now scan each port's disk(s) */
7176 DPRINTK("host probe begin\n");
7177 for (i = 0; i < host->n_ports; i++) {
7178 struct ata_port *ap = host->ports[i];
7180 ata_scsi_scan_host(ap, 1);
7181 ata_lpm_schedule(ap, ap->pm_policy);
7188 * ata_host_activate - start host, request IRQ and register it
7189 * @host: target ATA host
7190 * @irq: IRQ to request
7191 * @irq_handler: irq_handler used when requesting IRQ
7192 * @irq_flags: irq_flags used when requesting IRQ
7193 * @sht: scsi_host_template to use when registering the host
7195 * After allocating an ATA host and initializing it, most libata
7196 * LLDs perform three steps to activate the host - start host,
7197 * request IRQ and register it. This helper takes necessasry
7198 * arguments and performs the three steps in one go.
7200 * An invalid IRQ skips the IRQ registration and expects the host to
7201 * have set polling mode on the port. In this case, @irq_handler
7205 * Inherited from calling layer (may sleep).
7208 * 0 on success, -errno otherwise.
7210 int ata_host_activate(struct ata_host *host, int irq,
7211 irq_handler_t irq_handler, unsigned long irq_flags,
7212 struct scsi_host_template *sht)
7216 rc = ata_host_start(host);
7220 /* Special case for polling mode */
7222 WARN_ON(irq_handler);
7223 return ata_host_register(host, sht);
7226 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
7227 dev_driver_string(host->dev), host);
7231 for (i = 0; i < host->n_ports; i++)
7232 ata_port_desc(host->ports[i], "irq %d", irq);
7234 rc = ata_host_register(host, sht);
7235 /* if failed, just free the IRQ and leave ports alone */
7237 devm_free_irq(host->dev, irq, host);
7243 * ata_port_detach - Detach ATA port in prepration of device removal
7244 * @ap: ATA port to be detached
7246 * Detach all ATA devices and the associated SCSI devices of @ap;
7247 * then, remove the associated SCSI host. @ap is guaranteed to
7248 * be quiescent on return from this function.
7251 * Kernel thread context (may sleep).
7253 static void ata_port_detach(struct ata_port *ap)
7255 unsigned long flags;
7256 struct ata_link *link;
7257 struct ata_device *dev;
7259 if (!ap->ops->error_handler)
7262 /* tell EH we're leaving & flush EH */
7263 spin_lock_irqsave(ap->lock, flags);
7264 ap->pflags |= ATA_PFLAG_UNLOADING;
7265 spin_unlock_irqrestore(ap->lock, flags);
7267 ata_port_wait_eh(ap);
7269 /* EH is now guaranteed to see UNLOADING - EH context belongs
7270 * to us. Disable all existing devices.
7272 ata_port_for_each_link(link, ap) {
7273 ata_link_for_each_dev(dev, link)
7274 ata_dev_disable(dev);
7277 /* Final freeze & EH. All in-flight commands are aborted. EH
7278 * will be skipped and retrials will be terminated with bad
7281 spin_lock_irqsave(ap->lock, flags);
7282 ata_port_freeze(ap); /* won't be thawed */
7283 spin_unlock_irqrestore(ap->lock, flags);
7285 ata_port_wait_eh(ap);
7286 cancel_rearming_delayed_work(&ap->hotplug_task);
7289 /* remove the associated SCSI host */
7290 scsi_remove_host(ap->scsi_host);
7294 * ata_host_detach - Detach all ports of an ATA host
7295 * @host: Host to detach
7297 * Detach all ports of @host.
7300 * Kernel thread context (may sleep).
7302 void ata_host_detach(struct ata_host *host)
7306 for (i = 0; i < host->n_ports; i++)
7307 ata_port_detach(host->ports[i]);
7309 /* the host is dead now, dissociate ACPI */
7310 ata_acpi_dissociate(host);
7314 * ata_std_ports - initialize ioaddr with standard port offsets.
7315 * @ioaddr: IO address structure to be initialized
7317 * Utility function which initializes data_addr, error_addr,
7318 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
7319 * device_addr, status_addr, and command_addr to standard offsets
7320 * relative to cmd_addr.
7322 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
7325 void ata_std_ports(struct ata_ioports *ioaddr)
7327 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
7328 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
7329 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
7330 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
7331 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
7332 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
7333 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
7334 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
7335 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
7336 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
7343 * ata_pci_remove_one - PCI layer callback for device removal
7344 * @pdev: PCI device that was removed
7346 * PCI layer indicates to libata via this hook that hot-unplug or
7347 * module unload event has occurred. Detach all ports. Resource
7348 * release is handled via devres.
7351 * Inherited from PCI layer (may sleep).
7353 void ata_pci_remove_one(struct pci_dev *pdev)
7355 struct device *dev = &pdev->dev;
7356 struct ata_host *host = dev_get_drvdata(dev);
7358 ata_host_detach(host);
7361 /* move to PCI subsystem */
7362 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
7364 unsigned long tmp = 0;
7366 switch (bits->width) {
7369 pci_read_config_byte(pdev, bits->reg, &tmp8);
7375 pci_read_config_word(pdev, bits->reg, &tmp16);
7381 pci_read_config_dword(pdev, bits->reg, &tmp32);
7392 return (tmp == bits->val) ? 1 : 0;
7396 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
7398 pci_save_state(pdev);
7399 pci_disable_device(pdev);
7401 if (mesg.event == PM_EVENT_SUSPEND)
7402 pci_set_power_state(pdev, PCI_D3hot);
7405 int ata_pci_device_do_resume(struct pci_dev *pdev)
7409 pci_set_power_state(pdev, PCI_D0);
7410 pci_restore_state(pdev);
7412 rc = pcim_enable_device(pdev);
7414 dev_printk(KERN_ERR, &pdev->dev,
7415 "failed to enable device after resume (%d)\n", rc);
7419 pci_set_master(pdev);
7423 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7425 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7428 rc = ata_host_suspend(host, mesg);
7432 ata_pci_device_do_suspend(pdev, mesg);
7437 int ata_pci_device_resume(struct pci_dev *pdev)
7439 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7442 rc = ata_pci_device_do_resume(pdev);
7444 ata_host_resume(host);
7447 #endif /* CONFIG_PM */
7449 #endif /* CONFIG_PCI */
7452 static int __init ata_init(void)
7454 ata_probe_timeout *= HZ;
7455 ata_wq = create_workqueue("ata");
7459 ata_aux_wq = create_singlethread_workqueue("ata_aux");
7461 destroy_workqueue(ata_wq);
7465 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7469 static void __exit ata_exit(void)
7471 destroy_workqueue(ata_wq);
7472 destroy_workqueue(ata_aux_wq);
7475 subsys_initcall(ata_init);
7476 module_exit(ata_exit);
7478 static unsigned long ratelimit_time;
7479 static DEFINE_SPINLOCK(ata_ratelimit_lock);
7481 int ata_ratelimit(void)
7484 unsigned long flags;
7486 spin_lock_irqsave(&ata_ratelimit_lock, flags);
7488 if (time_after(jiffies, ratelimit_time)) {
7490 ratelimit_time = jiffies + (HZ/5);
7494 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
7500 * ata_wait_register - wait until register value changes
7501 * @reg: IO-mapped register
7502 * @mask: Mask to apply to read register value
7503 * @val: Wait condition
7504 * @interval_msec: polling interval in milliseconds
7505 * @timeout_msec: timeout in milliseconds
7507 * Waiting for some bits of register to change is a common
7508 * operation for ATA controllers. This function reads 32bit LE
7509 * IO-mapped register @reg and tests for the following condition.
7511 * (*@reg & mask) != val
7513 * If the condition is met, it returns; otherwise, the process is
7514 * repeated after @interval_msec until timeout.
7517 * Kernel thread context (may sleep)
7520 * The final register value.
7522 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
7523 unsigned long interval_msec,
7524 unsigned long timeout_msec)
7526 unsigned long timeout;
7529 tmp = ioread32(reg);
7531 /* Calculate timeout _after_ the first read to make sure
7532 * preceding writes reach the controller before starting to
7533 * eat away the timeout.
7535 timeout = jiffies + (timeout_msec * HZ) / 1000;
7537 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
7538 msleep(interval_msec);
7539 tmp = ioread32(reg);
7548 static void ata_dummy_noret(struct ata_port *ap) { }
7549 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
7550 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
7552 static u8 ata_dummy_check_status(struct ata_port *ap)
7557 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7559 return AC_ERR_SYSTEM;
7562 const struct ata_port_operations ata_dummy_port_ops = {
7563 .check_status = ata_dummy_check_status,
7564 .check_altstatus = ata_dummy_check_status,
7565 .dev_select = ata_noop_dev_select,
7566 .qc_prep = ata_noop_qc_prep,
7567 .qc_issue = ata_dummy_qc_issue,
7568 .freeze = ata_dummy_noret,
7569 .thaw = ata_dummy_noret,
7570 .error_handler = ata_dummy_noret,
7571 .post_internal_cmd = ata_dummy_qc_noret,
7572 .irq_clear = ata_dummy_noret,
7573 .port_start = ata_dummy_ret0,
7574 .port_stop = ata_dummy_noret,
7577 const struct ata_port_info ata_dummy_port_info = {
7578 .port_ops = &ata_dummy_port_ops,
7582 * libata is essentially a library of internal helper functions for
7583 * low-level ATA host controller drivers. As such, the API/ABI is
7584 * likely to change as new drivers are added and updated.
7585 * Do not depend on ABI/API stability.
7587 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7588 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7589 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7590 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7591 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7592 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7593 EXPORT_SYMBOL_GPL(ata_std_ports);
7594 EXPORT_SYMBOL_GPL(ata_host_init);
7595 EXPORT_SYMBOL_GPL(ata_host_alloc);
7596 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7597 EXPORT_SYMBOL_GPL(ata_host_start);
7598 EXPORT_SYMBOL_GPL(ata_host_register);
7599 EXPORT_SYMBOL_GPL(ata_host_activate);
7600 EXPORT_SYMBOL_GPL(ata_host_detach);
7601 EXPORT_SYMBOL_GPL(ata_sg_init);
7602 EXPORT_SYMBOL_GPL(ata_sg_init_one);
7603 EXPORT_SYMBOL_GPL(ata_hsm_move);
7604 EXPORT_SYMBOL_GPL(ata_qc_complete);
7605 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7606 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
7607 EXPORT_SYMBOL_GPL(ata_tf_load);
7608 EXPORT_SYMBOL_GPL(ata_tf_read);
7609 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
7610 EXPORT_SYMBOL_GPL(ata_std_dev_select);
7611 EXPORT_SYMBOL_GPL(sata_print_link_status);
7612 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7613 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7614 EXPORT_SYMBOL_GPL(ata_check_status);
7615 EXPORT_SYMBOL_GPL(ata_altstatus);
7616 EXPORT_SYMBOL_GPL(ata_exec_command);
7617 EXPORT_SYMBOL_GPL(ata_port_start);
7618 EXPORT_SYMBOL_GPL(ata_sff_port_start);
7619 EXPORT_SYMBOL_GPL(ata_interrupt);
7620 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7621 EXPORT_SYMBOL_GPL(ata_data_xfer);
7622 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7623 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7624 EXPORT_SYMBOL_GPL(ata_qc_prep);
7625 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7626 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7627 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
7628 EXPORT_SYMBOL_GPL(ata_bmdma_start);
7629 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
7630 EXPORT_SYMBOL_GPL(ata_bmdma_status);
7631 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7632 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
7633 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
7634 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
7635 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
7636 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
7637 EXPORT_SYMBOL_GPL(ata_port_probe);
7638 EXPORT_SYMBOL_GPL(ata_dev_disable);
7639 EXPORT_SYMBOL_GPL(sata_set_spd);
7640 EXPORT_SYMBOL_GPL(sata_link_debounce);
7641 EXPORT_SYMBOL_GPL(sata_link_resume);
7642 EXPORT_SYMBOL_GPL(ata_bus_reset);
7643 EXPORT_SYMBOL_GPL(ata_std_prereset);
7644 EXPORT_SYMBOL_GPL(ata_std_softreset);
7645 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7646 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7647 EXPORT_SYMBOL_GPL(ata_std_postreset);
7648 EXPORT_SYMBOL_GPL(ata_dev_classify);
7649 EXPORT_SYMBOL_GPL(ata_dev_pair);
7650 EXPORT_SYMBOL_GPL(ata_port_disable);
7651 EXPORT_SYMBOL_GPL(ata_ratelimit);
7652 EXPORT_SYMBOL_GPL(ata_wait_register);
7653 EXPORT_SYMBOL_GPL(ata_busy_sleep);
7654 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7655 EXPORT_SYMBOL_GPL(ata_wait_ready);
7656 EXPORT_SYMBOL_GPL(ata_port_queue_task);
7657 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
7658 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7659 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7660 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7661 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7662 EXPORT_SYMBOL_GPL(ata_host_intr);
7663 EXPORT_SYMBOL_GPL(sata_scr_valid);
7664 EXPORT_SYMBOL_GPL(sata_scr_read);
7665 EXPORT_SYMBOL_GPL(sata_scr_write);
7666 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7667 EXPORT_SYMBOL_GPL(ata_link_online);
7668 EXPORT_SYMBOL_GPL(ata_link_offline);
7670 EXPORT_SYMBOL_GPL(ata_host_suspend);
7671 EXPORT_SYMBOL_GPL(ata_host_resume);
7672 #endif /* CONFIG_PM */
7673 EXPORT_SYMBOL_GPL(ata_id_string);
7674 EXPORT_SYMBOL_GPL(ata_id_c_string);
7675 EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
7676 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7678 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7679 EXPORT_SYMBOL_GPL(ata_timing_compute);
7680 EXPORT_SYMBOL_GPL(ata_timing_merge);
7683 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7684 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
7685 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7686 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7687 EXPORT_SYMBOL_GPL(ata_pci_init_one);
7688 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7690 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7691 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7692 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7693 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7694 #endif /* CONFIG_PM */
7695 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
7696 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
7697 #endif /* CONFIG_PCI */
7699 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7700 EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
7701 EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
7702 EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
7703 EXPORT_SYMBOL_GPL(sata_pmp_do_eh);
7705 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7706 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7707 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7708 EXPORT_SYMBOL_GPL(ata_port_desc);
7710 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7711 #endif /* CONFIG_PCI */
7712 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7713 EXPORT_SYMBOL_GPL(ata_link_abort);
7714 EXPORT_SYMBOL_GPL(ata_port_abort);
7715 EXPORT_SYMBOL_GPL(ata_port_freeze);
7716 EXPORT_SYMBOL_GPL(sata_async_notification);
7717 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7718 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7719 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7720 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7721 EXPORT_SYMBOL_GPL(ata_do_eh);
7722 EXPORT_SYMBOL_GPL(ata_irq_on);
7723 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
7725 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7726 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7727 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7728 EXPORT_SYMBOL_GPL(ata_cable_sata);