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/spinlock.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/timer.h>
53 #include <linux/interrupt.h>
54 #include <linux/completion.h>
55 #include <linux/suspend.h>
56 #include <linux/workqueue.h>
57 #include <linux/scatterlist.h>
59 #include <linux/async.h>
60 #include <linux/log2.h>
61 #include <linux/slab.h>
62 #include <scsi/scsi.h>
63 #include <scsi/scsi_cmnd.h>
64 #include <scsi/scsi_host.h>
65 #include <linux/libata.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 const struct ata_port_operations ata_base_port_ops = {
78 .prereset = ata_std_prereset,
79 .postreset = ata_std_postreset,
80 .error_handler = ata_std_error_handler,
83 const struct ata_port_operations sata_port_ops = {
84 .inherits = &ata_base_port_ops,
86 .qc_defer = ata_std_qc_defer,
87 .hardreset = sata_std_hardreset,
90 static unsigned int ata_dev_init_params(struct ata_device *dev,
91 u16 heads, u16 sectors);
92 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
93 static unsigned int ata_dev_set_feature(struct ata_device *dev,
94 u8 enable, u8 feature);
95 static void ata_dev_xfermask(struct ata_device *dev);
96 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
98 unsigned int ata_print_id = 1;
99 static struct workqueue_struct *ata_wq;
101 struct workqueue_struct *ata_aux_wq;
103 struct ata_force_param {
107 unsigned long xfer_mask;
108 unsigned int horkage_on;
109 unsigned int horkage_off;
113 struct ata_force_ent {
116 struct ata_force_param param;
119 static struct ata_force_ent *ata_force_tbl;
120 static int ata_force_tbl_size;
122 static char ata_force_param_buf[PAGE_SIZE] __initdata;
123 /* param_buf is thrown away after initialization, disallow read */
124 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
125 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
127 static int atapi_enabled = 1;
128 module_param(atapi_enabled, int, 0444);
129 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
131 static int atapi_dmadir = 0;
132 module_param(atapi_dmadir, int, 0444);
133 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
135 int atapi_passthru16 = 1;
136 module_param(atapi_passthru16, int, 0444);
137 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
140 module_param_named(fua, libata_fua, int, 0444);
141 MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
143 static int ata_ignore_hpa;
144 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
145 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
147 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
148 module_param_named(dma, libata_dma_mask, int, 0444);
149 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
151 static int ata_probe_timeout;
152 module_param(ata_probe_timeout, int, 0444);
153 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
155 int libata_noacpi = 0;
156 module_param_named(noacpi, libata_noacpi, int, 0444);
157 MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
159 int libata_allow_tpm = 0;
160 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
161 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
163 MODULE_AUTHOR("Jeff Garzik");
164 MODULE_DESCRIPTION("Library module for ATA devices");
165 MODULE_LICENSE("GPL");
166 MODULE_VERSION(DRV_VERSION);
169 static bool ata_sstatus_online(u32 sstatus)
171 return (sstatus & 0xf) == 0x3;
175 * ata_link_next - link iteration helper
176 * @link: the previous link, NULL to start
177 * @ap: ATA port containing links to iterate
178 * @mode: iteration mode, one of ATA_LITER_*
181 * Host lock or EH context.
184 * Pointer to the next link.
186 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
187 enum ata_link_iter_mode mode)
189 BUG_ON(mode != ATA_LITER_EDGE &&
190 mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
192 /* NULL link indicates start of iteration */
196 case ATA_LITER_PMP_FIRST:
197 if (sata_pmp_attached(ap))
200 case ATA_LITER_HOST_FIRST:
204 /* we just iterated over the host link, what's next? */
205 if (link == &ap->link)
207 case ATA_LITER_HOST_FIRST:
208 if (sata_pmp_attached(ap))
211 case ATA_LITER_PMP_FIRST:
212 if (unlikely(ap->slave_link))
213 return ap->slave_link;
219 /* slave_link excludes PMP */
220 if (unlikely(link == ap->slave_link))
223 /* we were over a PMP link */
224 if (++link < ap->pmp_link + ap->nr_pmp_links)
227 if (mode == ATA_LITER_PMP_FIRST)
234 * ata_dev_next - device iteration helper
235 * @dev: the previous device, NULL to start
236 * @link: ATA link containing devices to iterate
237 * @mode: iteration mode, one of ATA_DITER_*
240 * Host lock or EH context.
243 * Pointer to the next device.
245 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
246 enum ata_dev_iter_mode mode)
248 BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
249 mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
251 /* NULL dev indicates start of iteration */
254 case ATA_DITER_ENABLED:
258 case ATA_DITER_ENABLED_REVERSE:
259 case ATA_DITER_ALL_REVERSE:
260 dev = link->device + ata_link_max_devices(link) - 1;
265 /* move to the next one */
267 case ATA_DITER_ENABLED:
269 if (++dev < link->device + ata_link_max_devices(link))
272 case ATA_DITER_ENABLED_REVERSE:
273 case ATA_DITER_ALL_REVERSE:
274 if (--dev >= link->device)
280 if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
281 !ata_dev_enabled(dev))
287 * ata_dev_phys_link - find physical link for a device
288 * @dev: ATA device to look up physical link for
290 * Look up physical link which @dev is attached to. Note that
291 * this is different from @dev->link only when @dev is on slave
292 * link. For all other cases, it's the same as @dev->link.
298 * Pointer to the found physical link.
300 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
302 struct ata_port *ap = dev->link->ap;
308 return ap->slave_link;
312 * ata_force_cbl - force cable type according to libata.force
313 * @ap: ATA port of interest
315 * Force cable type according to libata.force and whine about it.
316 * The last entry which has matching port number is used, so it
317 * can be specified as part of device force parameters. For
318 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
324 void ata_force_cbl(struct ata_port *ap)
328 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
329 const struct ata_force_ent *fe = &ata_force_tbl[i];
331 if (fe->port != -1 && fe->port != ap->print_id)
334 if (fe->param.cbl == ATA_CBL_NONE)
337 ap->cbl = fe->param.cbl;
338 ata_port_printk(ap, KERN_NOTICE,
339 "FORCE: cable set to %s\n", fe->param.name);
345 * ata_force_link_limits - force link limits according to libata.force
346 * @link: ATA link of interest
348 * Force link flags and SATA spd limit according to libata.force
349 * and whine about it. When only the port part is specified
350 * (e.g. 1:), the limit applies to all links connected to both
351 * the host link and all fan-out ports connected via PMP. If the
352 * device part is specified as 0 (e.g. 1.00:), it specifies the
353 * first fan-out link not the host link. Device number 15 always
354 * points to the host link whether PMP is attached or not. If the
355 * controller has slave link, device number 16 points to it.
360 static void ata_force_link_limits(struct ata_link *link)
362 bool did_spd = false;
363 int linkno = link->pmp;
366 if (ata_is_host_link(link))
369 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
370 const struct ata_force_ent *fe = &ata_force_tbl[i];
372 if (fe->port != -1 && fe->port != link->ap->print_id)
375 if (fe->device != -1 && fe->device != linkno)
378 /* only honor the first spd limit */
379 if (!did_spd && fe->param.spd_limit) {
380 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
381 ata_link_printk(link, KERN_NOTICE,
382 "FORCE: PHY spd limit set to %s\n",
387 /* let lflags stack */
388 if (fe->param.lflags) {
389 link->flags |= fe->param.lflags;
390 ata_link_printk(link, KERN_NOTICE,
391 "FORCE: link flag 0x%x forced -> 0x%x\n",
392 fe->param.lflags, link->flags);
398 * ata_force_xfermask - force xfermask according to libata.force
399 * @dev: ATA device of interest
401 * Force xfer_mask according to libata.force and whine about it.
402 * For consistency with link selection, device number 15 selects
403 * the first device connected to the host link.
408 static void ata_force_xfermask(struct ata_device *dev)
410 int devno = dev->link->pmp + dev->devno;
411 int alt_devno = devno;
414 /* allow n.15/16 for devices attached to host port */
415 if (ata_is_host_link(dev->link))
418 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
419 const struct ata_force_ent *fe = &ata_force_tbl[i];
420 unsigned long pio_mask, mwdma_mask, udma_mask;
422 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
425 if (fe->device != -1 && fe->device != devno &&
426 fe->device != alt_devno)
429 if (!fe->param.xfer_mask)
432 ata_unpack_xfermask(fe->param.xfer_mask,
433 &pio_mask, &mwdma_mask, &udma_mask);
435 dev->udma_mask = udma_mask;
436 else if (mwdma_mask) {
438 dev->mwdma_mask = mwdma_mask;
442 dev->pio_mask = pio_mask;
445 ata_dev_printk(dev, KERN_NOTICE,
446 "FORCE: xfer_mask set to %s\n", fe->param.name);
452 * ata_force_horkage - force horkage according to libata.force
453 * @dev: ATA device of interest
455 * Force horkage according to libata.force and whine about it.
456 * For consistency with link selection, device number 15 selects
457 * the first device connected to the host link.
462 static void ata_force_horkage(struct ata_device *dev)
464 int devno = dev->link->pmp + dev->devno;
465 int alt_devno = devno;
468 /* allow n.15/16 for devices attached to host port */
469 if (ata_is_host_link(dev->link))
472 for (i = 0; i < ata_force_tbl_size; i++) {
473 const struct ata_force_ent *fe = &ata_force_tbl[i];
475 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
478 if (fe->device != -1 && fe->device != devno &&
479 fe->device != alt_devno)
482 if (!(~dev->horkage & fe->param.horkage_on) &&
483 !(dev->horkage & fe->param.horkage_off))
486 dev->horkage |= fe->param.horkage_on;
487 dev->horkage &= ~fe->param.horkage_off;
489 ata_dev_printk(dev, KERN_NOTICE,
490 "FORCE: horkage modified (%s)\n", fe->param.name);
495 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
496 * @opcode: SCSI opcode
498 * Determine ATAPI command type from @opcode.
504 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
506 int atapi_cmd_type(u8 opcode)
515 case GPCMD_WRITE_AND_VERIFY_10:
519 case GPCMD_READ_CD_MSF:
520 return ATAPI_READ_CD;
524 if (atapi_passthru16)
525 return ATAPI_PASS_THRU;
533 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
534 * @tf: Taskfile to convert
535 * @pmp: Port multiplier port
536 * @is_cmd: This FIS is for command
537 * @fis: Buffer into which data will output
539 * Converts a standard ATA taskfile to a Serial ATA
540 * FIS structure (Register - Host to Device).
543 * Inherited from caller.
545 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
547 fis[0] = 0x27; /* Register - Host to Device FIS */
548 fis[1] = pmp & 0xf; /* Port multiplier number*/
550 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
552 fis[2] = tf->command;
553 fis[3] = tf->feature;
560 fis[8] = tf->hob_lbal;
561 fis[9] = tf->hob_lbam;
562 fis[10] = tf->hob_lbah;
563 fis[11] = tf->hob_feature;
566 fis[13] = tf->hob_nsect;
577 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
578 * @fis: Buffer from which data will be input
579 * @tf: Taskfile to output
581 * Converts a serial ATA FIS structure to a standard ATA taskfile.
584 * Inherited from caller.
587 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
589 tf->command = fis[2]; /* status */
590 tf->feature = fis[3]; /* error */
597 tf->hob_lbal = fis[8];
598 tf->hob_lbam = fis[9];
599 tf->hob_lbah = fis[10];
602 tf->hob_nsect = fis[13];
605 static const u8 ata_rw_cmds[] = {
609 ATA_CMD_READ_MULTI_EXT,
610 ATA_CMD_WRITE_MULTI_EXT,
614 ATA_CMD_WRITE_MULTI_FUA_EXT,
618 ATA_CMD_PIO_READ_EXT,
619 ATA_CMD_PIO_WRITE_EXT,
632 ATA_CMD_WRITE_FUA_EXT
636 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
637 * @tf: command to examine and configure
638 * @dev: device tf belongs to
640 * Examine the device configuration and tf->flags to calculate
641 * the proper read/write commands and protocol to use.
646 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
650 int index, fua, lba48, write;
652 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
653 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
654 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
656 if (dev->flags & ATA_DFLAG_PIO) {
657 tf->protocol = ATA_PROT_PIO;
658 index = dev->multi_count ? 0 : 8;
659 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
660 /* Unable to use DMA due to host limitation */
661 tf->protocol = ATA_PROT_PIO;
662 index = dev->multi_count ? 0 : 8;
664 tf->protocol = ATA_PROT_DMA;
668 cmd = ata_rw_cmds[index + fua + lba48 + write];
677 * ata_tf_read_block - Read block address from ATA taskfile
678 * @tf: ATA taskfile of interest
679 * @dev: ATA device @tf belongs to
684 * Read block address from @tf. This function can handle all
685 * three address formats - LBA, LBA48 and CHS. tf->protocol and
686 * flags select the address format to use.
689 * Block address read from @tf.
691 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
695 if (tf->flags & ATA_TFLAG_LBA) {
696 if (tf->flags & ATA_TFLAG_LBA48) {
697 block |= (u64)tf->hob_lbah << 40;
698 block |= (u64)tf->hob_lbam << 32;
699 block |= (u64)tf->hob_lbal << 24;
701 block |= (tf->device & 0xf) << 24;
703 block |= tf->lbah << 16;
704 block |= tf->lbam << 8;
709 cyl = tf->lbam | (tf->lbah << 8);
710 head = tf->device & 0xf;
714 ata_dev_printk(dev, KERN_WARNING, "device reported "
715 "invalid CHS sector 0\n");
716 sect = 1; /* oh well */
719 block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
726 * ata_build_rw_tf - Build ATA taskfile for given read/write request
727 * @tf: Target ATA taskfile
728 * @dev: ATA device @tf belongs to
729 * @block: Block address
730 * @n_block: Number of blocks
731 * @tf_flags: RW/FUA etc...
737 * Build ATA taskfile @tf for read/write request described by
738 * @block, @n_block, @tf_flags and @tag on @dev.
742 * 0 on success, -ERANGE if the request is too large for @dev,
743 * -EINVAL if the request is invalid.
745 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
746 u64 block, u32 n_block, unsigned int tf_flags,
749 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
750 tf->flags |= tf_flags;
752 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
754 if (!lba_48_ok(block, n_block))
757 tf->protocol = ATA_PROT_NCQ;
758 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
760 if (tf->flags & ATA_TFLAG_WRITE)
761 tf->command = ATA_CMD_FPDMA_WRITE;
763 tf->command = ATA_CMD_FPDMA_READ;
765 tf->nsect = tag << 3;
766 tf->hob_feature = (n_block >> 8) & 0xff;
767 tf->feature = n_block & 0xff;
769 tf->hob_lbah = (block >> 40) & 0xff;
770 tf->hob_lbam = (block >> 32) & 0xff;
771 tf->hob_lbal = (block >> 24) & 0xff;
772 tf->lbah = (block >> 16) & 0xff;
773 tf->lbam = (block >> 8) & 0xff;
774 tf->lbal = block & 0xff;
777 if (tf->flags & ATA_TFLAG_FUA)
778 tf->device |= 1 << 7;
779 } else if (dev->flags & ATA_DFLAG_LBA) {
780 tf->flags |= ATA_TFLAG_LBA;
782 if (lba_28_ok(block, n_block)) {
784 tf->device |= (block >> 24) & 0xf;
785 } else if (lba_48_ok(block, n_block)) {
786 if (!(dev->flags & ATA_DFLAG_LBA48))
790 tf->flags |= ATA_TFLAG_LBA48;
792 tf->hob_nsect = (n_block >> 8) & 0xff;
794 tf->hob_lbah = (block >> 40) & 0xff;
795 tf->hob_lbam = (block >> 32) & 0xff;
796 tf->hob_lbal = (block >> 24) & 0xff;
798 /* request too large even for LBA48 */
801 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
804 tf->nsect = n_block & 0xff;
806 tf->lbah = (block >> 16) & 0xff;
807 tf->lbam = (block >> 8) & 0xff;
808 tf->lbal = block & 0xff;
810 tf->device |= ATA_LBA;
813 u32 sect, head, cyl, track;
815 /* The request -may- be too large for CHS addressing. */
816 if (!lba_28_ok(block, n_block))
819 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
822 /* Convert LBA to CHS */
823 track = (u32)block / dev->sectors;
824 cyl = track / dev->heads;
825 head = track % dev->heads;
826 sect = (u32)block % dev->sectors + 1;
828 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
829 (u32)block, track, cyl, head, sect);
831 /* Check whether the converted CHS can fit.
835 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
838 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
849 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
850 * @pio_mask: pio_mask
851 * @mwdma_mask: mwdma_mask
852 * @udma_mask: udma_mask
854 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
855 * unsigned int xfer_mask.
863 unsigned long ata_pack_xfermask(unsigned long pio_mask,
864 unsigned long mwdma_mask,
865 unsigned long udma_mask)
867 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
868 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
869 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
873 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
874 * @xfer_mask: xfer_mask to unpack
875 * @pio_mask: resulting pio_mask
876 * @mwdma_mask: resulting mwdma_mask
877 * @udma_mask: resulting udma_mask
879 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
880 * Any NULL distination masks will be ignored.
882 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
883 unsigned long *mwdma_mask, unsigned long *udma_mask)
886 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
888 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
890 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
893 static const struct ata_xfer_ent {
897 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
898 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
899 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
904 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
905 * @xfer_mask: xfer_mask of interest
907 * Return matching XFER_* value for @xfer_mask. Only the highest
908 * bit of @xfer_mask is considered.
914 * Matching XFER_* value, 0xff if no match found.
916 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
918 int highbit = fls(xfer_mask) - 1;
919 const struct ata_xfer_ent *ent;
921 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
922 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
923 return ent->base + highbit - ent->shift;
928 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
929 * @xfer_mode: XFER_* of interest
931 * Return matching xfer_mask for @xfer_mode.
937 * Matching xfer_mask, 0 if no match found.
939 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
941 const struct ata_xfer_ent *ent;
943 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
944 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
945 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
946 & ~((1 << ent->shift) - 1);
951 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
952 * @xfer_mode: XFER_* of interest
954 * Return matching xfer_shift for @xfer_mode.
960 * Matching xfer_shift, -1 if no match found.
962 int ata_xfer_mode2shift(unsigned long xfer_mode)
964 const struct ata_xfer_ent *ent;
966 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
967 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
973 * ata_mode_string - convert xfer_mask to string
974 * @xfer_mask: mask of bits supported; only highest bit counts.
976 * Determine string which represents the highest speed
977 * (highest bit in @modemask).
983 * Constant C string representing highest speed listed in
984 * @mode_mask, or the constant C string "<n/a>".
986 const char *ata_mode_string(unsigned long xfer_mask)
988 static const char * const xfer_mode_str[] = {
1012 highbit = fls(xfer_mask) - 1;
1013 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
1014 return xfer_mode_str[highbit];
1018 static const char *sata_spd_string(unsigned int spd)
1020 static const char * const spd_str[] = {
1026 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
1028 return spd_str[spd - 1];
1031 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
1033 struct ata_link *link = dev->link;
1034 struct ata_port *ap = link->ap;
1036 unsigned int err_mask;
1040 * disallow DIPM for drivers which haven't set
1041 * ATA_FLAG_IPM. This is because when DIPM is enabled,
1042 * phy ready will be set in the interrupt status on
1043 * state changes, which will cause some drivers to
1044 * think there are errors - additionally drivers will
1045 * need to disable hot plug.
1047 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
1048 ap->pm_policy = NOT_AVAILABLE;
1053 * For DIPM, we will only enable it for the
1054 * min_power setting.
1056 * Why? Because Disks are too stupid to know that
1057 * If the host rejects a request to go to SLUMBER
1058 * they should retry at PARTIAL, and instead it
1059 * just would give up. So, for medium_power to
1060 * work at all, we need to only allow HIPM.
1062 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
1068 /* no restrictions on IPM transitions */
1069 scontrol &= ~(0x3 << 8);
1070 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1075 if (dev->flags & ATA_DFLAG_DIPM)
1076 err_mask = ata_dev_set_feature(dev,
1077 SETFEATURES_SATA_ENABLE, SATA_DIPM);
1080 /* allow IPM to PARTIAL */
1081 scontrol &= ~(0x1 << 8);
1082 scontrol |= (0x2 << 8);
1083 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1088 * we don't have to disable DIPM since IPM flags
1089 * disallow transitions to SLUMBER, which effectively
1090 * disable DIPM if it does not support PARTIAL
1094 case MAX_PERFORMANCE:
1095 /* disable all IPM transitions */
1096 scontrol |= (0x3 << 8);
1097 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
1102 * we don't have to disable DIPM since IPM flags
1103 * disallow all transitions which effectively
1104 * disable DIPM anyway.
1109 /* FIXME: handle SET FEATURES failure */
1116 * ata_dev_enable_pm - enable SATA interface power management
1117 * @dev: device to enable power management
1118 * @policy: the link power management policy
1120 * Enable SATA Interface power management. This will enable
1121 * Device Interface Power Management (DIPM) for min_power
1122 * policy, and then call driver specific callbacks for
1123 * enabling Host Initiated Power management.
1126 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
1128 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
1131 struct ata_port *ap = dev->link->ap;
1133 /* set HIPM first, then DIPM */
1134 if (ap->ops->enable_pm)
1135 rc = ap->ops->enable_pm(ap, policy);
1138 rc = ata_dev_set_dipm(dev, policy);
1142 ap->pm_policy = MAX_PERFORMANCE;
1144 ap->pm_policy = policy;
1145 return /* rc */; /* hopefully we can use 'rc' eventually */
1150 * ata_dev_disable_pm - disable SATA interface power management
1151 * @dev: device to disable power management
1153 * Disable SATA Interface power management. This will disable
1154 * Device Interface Power Management (DIPM) without changing
1155 * policy, call driver specific callbacks for disabling Host
1156 * Initiated Power management.
1161 static void ata_dev_disable_pm(struct ata_device *dev)
1163 struct ata_port *ap = dev->link->ap;
1165 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1166 if (ap->ops->disable_pm)
1167 ap->ops->disable_pm(ap);
1169 #endif /* CONFIG_PM */
1171 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1173 ap->pm_policy = policy;
1174 ap->link.eh_info.action |= ATA_EH_LPM;
1175 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1176 ata_port_schedule_eh(ap);
1180 static void ata_lpm_enable(struct ata_host *host)
1182 struct ata_link *link;
1183 struct ata_port *ap;
1184 struct ata_device *dev;
1187 for (i = 0; i < host->n_ports; i++) {
1188 ap = host->ports[i];
1189 ata_for_each_link(link, ap, EDGE) {
1190 ata_for_each_dev(dev, link, ALL)
1191 ata_dev_disable_pm(dev);
1196 static void ata_lpm_disable(struct ata_host *host)
1200 for (i = 0; i < host->n_ports; i++) {
1201 struct ata_port *ap = host->ports[i];
1202 ata_lpm_schedule(ap, ap->pm_policy);
1205 #endif /* CONFIG_PM */
1208 * ata_dev_classify - determine device type based on ATA-spec signature
1209 * @tf: ATA taskfile register set for device to be identified
1211 * Determine from taskfile register contents whether a device is
1212 * ATA or ATAPI, as per "Signature and persistence" section
1213 * of ATA/PI spec (volume 1, sect 5.14).
1219 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1220 * %ATA_DEV_UNKNOWN the event of failure.
1222 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1224 /* Apple's open source Darwin code hints that some devices only
1225 * put a proper signature into the LBA mid/high registers,
1226 * So, we only check those. It's sufficient for uniqueness.
1228 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1229 * signatures for ATA and ATAPI devices attached on SerialATA,
1230 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1231 * spec has never mentioned about using different signatures
1232 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1233 * Multiplier specification began to use 0x69/0x96 to identify
1234 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1235 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1236 * 0x69/0x96 shortly and described them as reserved for
1239 * We follow the current spec and consider that 0x69/0x96
1240 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1241 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1242 * SEMB signature. This is worked around in
1243 * ata_dev_read_id().
1245 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1246 DPRINTK("found ATA device by sig\n");
1250 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1251 DPRINTK("found ATAPI device by sig\n");
1252 return ATA_DEV_ATAPI;
1255 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1256 DPRINTK("found PMP device by sig\n");
1260 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1261 DPRINTK("found SEMB device by sig (could be ATA device)\n");
1262 return ATA_DEV_SEMB;
1265 DPRINTK("unknown device\n");
1266 return ATA_DEV_UNKNOWN;
1270 * ata_id_string - Convert IDENTIFY DEVICE page into string
1271 * @id: IDENTIFY DEVICE results we will examine
1272 * @s: string into which data is output
1273 * @ofs: offset into identify device page
1274 * @len: length of string to return. must be an even number.
1276 * The strings in the IDENTIFY DEVICE page are broken up into
1277 * 16-bit chunks. Run through the string, and output each
1278 * 8-bit chunk linearly, regardless of platform.
1284 void ata_id_string(const u16 *id, unsigned char *s,
1285 unsigned int ofs, unsigned int len)
1306 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1307 * @id: IDENTIFY DEVICE results we will examine
1308 * @s: string into which data is output
1309 * @ofs: offset into identify device page
1310 * @len: length of string to return. must be an odd number.
1312 * This function is identical to ata_id_string except that it
1313 * trims trailing spaces and terminates the resulting string with
1314 * null. @len must be actual maximum length (even number) + 1.
1319 void ata_id_c_string(const u16 *id, unsigned char *s,
1320 unsigned int ofs, unsigned int len)
1324 ata_id_string(id, s, ofs, len - 1);
1326 p = s + strnlen(s, len - 1);
1327 while (p > s && p[-1] == ' ')
1332 static u64 ata_id_n_sectors(const u16 *id)
1334 if (ata_id_has_lba(id)) {
1335 if (ata_id_has_lba48(id))
1336 return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1338 return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1340 if (ata_id_current_chs_valid(id))
1341 return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1342 id[ATA_ID_CUR_SECTORS];
1344 return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1349 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1353 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1354 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1355 sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1356 sectors |= (tf->lbah & 0xff) << 16;
1357 sectors |= (tf->lbam & 0xff) << 8;
1358 sectors |= (tf->lbal & 0xff);
1363 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1367 sectors |= (tf->device & 0x0f) << 24;
1368 sectors |= (tf->lbah & 0xff) << 16;
1369 sectors |= (tf->lbam & 0xff) << 8;
1370 sectors |= (tf->lbal & 0xff);
1376 * ata_read_native_max_address - Read native max address
1377 * @dev: target device
1378 * @max_sectors: out parameter for the result native max address
1380 * Perform an LBA48 or LBA28 native size query upon the device in
1384 * 0 on success, -EACCES if command is aborted by the drive.
1385 * -EIO on other errors.
1387 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1389 unsigned int err_mask;
1390 struct ata_taskfile tf;
1391 int lba48 = ata_id_has_lba48(dev->id);
1393 ata_tf_init(dev, &tf);
1395 /* always clear all address registers */
1396 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1399 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1400 tf.flags |= ATA_TFLAG_LBA48;
1402 tf.command = ATA_CMD_READ_NATIVE_MAX;
1404 tf.protocol |= ATA_PROT_NODATA;
1405 tf.device |= ATA_LBA;
1407 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1409 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1410 "max address (err_mask=0x%x)\n", err_mask);
1411 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1417 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1419 *max_sectors = ata_tf_to_lba(&tf) + 1;
1420 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1426 * ata_set_max_sectors - Set max sectors
1427 * @dev: target device
1428 * @new_sectors: new max sectors value to set for the device
1430 * Set max sectors of @dev to @new_sectors.
1433 * 0 on success, -EACCES if command is aborted or denied (due to
1434 * previous non-volatile SET_MAX) by the drive. -EIO on other
1437 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1439 unsigned int err_mask;
1440 struct ata_taskfile tf;
1441 int lba48 = ata_id_has_lba48(dev->id);
1445 ata_tf_init(dev, &tf);
1447 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1450 tf.command = ATA_CMD_SET_MAX_EXT;
1451 tf.flags |= ATA_TFLAG_LBA48;
1453 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1454 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1455 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1457 tf.command = ATA_CMD_SET_MAX;
1459 tf.device |= (new_sectors >> 24) & 0xf;
1462 tf.protocol |= ATA_PROT_NODATA;
1463 tf.device |= ATA_LBA;
1465 tf.lbal = (new_sectors >> 0) & 0xff;
1466 tf.lbam = (new_sectors >> 8) & 0xff;
1467 tf.lbah = (new_sectors >> 16) & 0xff;
1469 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1471 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1472 "max address (err_mask=0x%x)\n", err_mask);
1473 if (err_mask == AC_ERR_DEV &&
1474 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1483 * ata_hpa_resize - Resize a device with an HPA set
1484 * @dev: Device to resize
1486 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1487 * it if required to the full size of the media. The caller must check
1488 * the drive has the HPA feature set enabled.
1491 * 0 on success, -errno on failure.
1493 static int ata_hpa_resize(struct ata_device *dev)
1495 struct ata_eh_context *ehc = &dev->link->eh_context;
1496 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1497 u64 sectors = ata_id_n_sectors(dev->id);
1501 /* do we need to do it? */
1502 if (dev->class != ATA_DEV_ATA ||
1503 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1504 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1507 /* read native max address */
1508 rc = ata_read_native_max_address(dev, &native_sectors);
1510 /* If device aborted the command or HPA isn't going to
1511 * be unlocked, skip HPA resizing.
1513 if (rc == -EACCES || !ata_ignore_hpa) {
1514 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1515 "broken, skipping HPA handling\n");
1516 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1518 /* we can continue if device aborted the command */
1525 dev->n_native_sectors = native_sectors;
1527 /* nothing to do? */
1528 if (native_sectors <= sectors || !ata_ignore_hpa) {
1529 if (!print_info || native_sectors == sectors)
1532 if (native_sectors > sectors)
1533 ata_dev_printk(dev, KERN_INFO,
1534 "HPA detected: current %llu, native %llu\n",
1535 (unsigned long long)sectors,
1536 (unsigned long long)native_sectors);
1537 else if (native_sectors < sectors)
1538 ata_dev_printk(dev, KERN_WARNING,
1539 "native sectors (%llu) is smaller than "
1541 (unsigned long long)native_sectors,
1542 (unsigned long long)sectors);
1546 /* let's unlock HPA */
1547 rc = ata_set_max_sectors(dev, native_sectors);
1548 if (rc == -EACCES) {
1549 /* if device aborted the command, skip HPA resizing */
1550 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1551 "(%llu -> %llu), skipping HPA handling\n",
1552 (unsigned long long)sectors,
1553 (unsigned long long)native_sectors);
1554 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1559 /* re-read IDENTIFY data */
1560 rc = ata_dev_reread_id(dev, 0);
1562 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1563 "data after HPA resizing\n");
1568 u64 new_sectors = ata_id_n_sectors(dev->id);
1569 ata_dev_printk(dev, KERN_INFO,
1570 "HPA unlocked: %llu -> %llu, native %llu\n",
1571 (unsigned long long)sectors,
1572 (unsigned long long)new_sectors,
1573 (unsigned long long)native_sectors);
1580 * ata_dump_id - IDENTIFY DEVICE info debugging output
1581 * @id: IDENTIFY DEVICE page to dump
1583 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1590 static inline void ata_dump_id(const u16 *id)
1592 DPRINTK("49==0x%04x "
1602 DPRINTK("80==0x%04x "
1612 DPRINTK("88==0x%04x "
1619 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1620 * @id: IDENTIFY data to compute xfer mask from
1622 * Compute the xfermask for this device. This is not as trivial
1623 * as it seems if we must consider early devices correctly.
1625 * FIXME: pre IDE drive timing (do we care ?).
1633 unsigned long ata_id_xfermask(const u16 *id)
1635 unsigned long pio_mask, mwdma_mask, udma_mask;
1637 /* Usual case. Word 53 indicates word 64 is valid */
1638 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1639 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1643 /* If word 64 isn't valid then Word 51 high byte holds
1644 * the PIO timing number for the maximum. Turn it into
1647 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1648 if (mode < 5) /* Valid PIO range */
1649 pio_mask = (2 << mode) - 1;
1653 /* But wait.. there's more. Design your standards by
1654 * committee and you too can get a free iordy field to
1655 * process. However its the speeds not the modes that
1656 * are supported... Note drivers using the timing API
1657 * will get this right anyway
1661 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1663 if (ata_id_is_cfa(id)) {
1665 * Process compact flash extended modes
1667 int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1668 int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1671 pio_mask |= (1 << 5);
1673 pio_mask |= (1 << 6);
1675 mwdma_mask |= (1 << 3);
1677 mwdma_mask |= (1 << 4);
1681 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1682 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1684 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1688 * ata_pio_queue_task - Queue port_task
1689 * @ap: The ata_port to queue port_task for
1690 * @data: data for @fn to use
1691 * @delay: delay time in msecs for workqueue function
1693 * Schedule @fn(@data) for execution after @delay jiffies using
1694 * port_task. There is one port_task per port and it's the
1695 * user(low level driver)'s responsibility to make sure that only
1696 * one task is active at any given time.
1698 * libata core layer takes care of synchronization between
1699 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1703 * Inherited from caller.
1705 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1707 ap->port_task_data = data;
1709 /* may fail if ata_port_flush_task() in progress */
1710 queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
1714 * ata_port_flush_task - Flush port_task
1715 * @ap: The ata_port to flush port_task for
1717 * After this function completes, port_task is guranteed not to
1718 * be running or scheduled.
1721 * Kernel thread context (may sleep)
1723 void ata_port_flush_task(struct ata_port *ap)
1727 cancel_rearming_delayed_work(&ap->port_task);
1729 if (ata_msg_ctl(ap))
1730 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1733 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1735 struct completion *waiting = qc->private_data;
1741 * ata_exec_internal_sg - execute libata internal command
1742 * @dev: Device to which the command is sent
1743 * @tf: Taskfile registers for the command and the result
1744 * @cdb: CDB for packet command
1745 * @dma_dir: Data tranfer direction of the command
1746 * @sgl: sg list for the data buffer of the command
1747 * @n_elem: Number of sg entries
1748 * @timeout: Timeout in msecs (0 for default)
1750 * Executes libata internal command with timeout. @tf contains
1751 * command on entry and result on return. Timeout and error
1752 * conditions are reported via return value. No recovery action
1753 * is taken after a command times out. It's caller's duty to
1754 * clean up after timeout.
1757 * None. Should be called with kernel context, might sleep.
1760 * Zero on success, AC_ERR_* mask on failure
1762 unsigned ata_exec_internal_sg(struct ata_device *dev,
1763 struct ata_taskfile *tf, const u8 *cdb,
1764 int dma_dir, struct scatterlist *sgl,
1765 unsigned int n_elem, unsigned long timeout)
1767 struct ata_link *link = dev->link;
1768 struct ata_port *ap = link->ap;
1769 u8 command = tf->command;
1770 int auto_timeout = 0;
1771 struct ata_queued_cmd *qc;
1772 unsigned int tag, preempted_tag;
1773 u32 preempted_sactive, preempted_qc_active;
1774 int preempted_nr_active_links;
1775 DECLARE_COMPLETION_ONSTACK(wait);
1776 unsigned long flags;
1777 unsigned int err_mask;
1780 spin_lock_irqsave(ap->lock, flags);
1782 /* no internal command while frozen */
1783 if (ap->pflags & ATA_PFLAG_FROZEN) {
1784 spin_unlock_irqrestore(ap->lock, flags);
1785 return AC_ERR_SYSTEM;
1788 /* initialize internal qc */
1790 /* XXX: Tag 0 is used for drivers with legacy EH as some
1791 * drivers choke if any other tag is given. This breaks
1792 * ata_tag_internal() test for those drivers. Don't use new
1793 * EH stuff without converting to it.
1795 if (ap->ops->error_handler)
1796 tag = ATA_TAG_INTERNAL;
1800 if (test_and_set_bit(tag, &ap->qc_allocated))
1802 qc = __ata_qc_from_tag(ap, tag);
1810 preempted_tag = link->active_tag;
1811 preempted_sactive = link->sactive;
1812 preempted_qc_active = ap->qc_active;
1813 preempted_nr_active_links = ap->nr_active_links;
1814 link->active_tag = ATA_TAG_POISON;
1817 ap->nr_active_links = 0;
1819 /* prepare & issue qc */
1822 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1823 qc->flags |= ATA_QCFLAG_RESULT_TF;
1824 qc->dma_dir = dma_dir;
1825 if (dma_dir != DMA_NONE) {
1826 unsigned int i, buflen = 0;
1827 struct scatterlist *sg;
1829 for_each_sg(sgl, sg, n_elem, i)
1830 buflen += sg->length;
1832 ata_sg_init(qc, sgl, n_elem);
1833 qc->nbytes = buflen;
1836 qc->private_data = &wait;
1837 qc->complete_fn = ata_qc_complete_internal;
1841 spin_unlock_irqrestore(ap->lock, flags);
1844 if (ata_probe_timeout)
1845 timeout = ata_probe_timeout * 1000;
1847 timeout = ata_internal_cmd_timeout(dev, command);
1852 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1854 ata_port_flush_task(ap);
1857 spin_lock_irqsave(ap->lock, flags);
1859 /* We're racing with irq here. If we lose, the
1860 * following test prevents us from completing the qc
1861 * twice. If we win, the port is frozen and will be
1862 * cleaned up by ->post_internal_cmd().
1864 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1865 qc->err_mask |= AC_ERR_TIMEOUT;
1867 if (ap->ops->error_handler)
1868 ata_port_freeze(ap);
1870 ata_qc_complete(qc);
1872 if (ata_msg_warn(ap))
1873 ata_dev_printk(dev, KERN_WARNING,
1874 "qc timeout (cmd 0x%x)\n", command);
1877 spin_unlock_irqrestore(ap->lock, flags);
1880 /* do post_internal_cmd */
1881 if (ap->ops->post_internal_cmd)
1882 ap->ops->post_internal_cmd(qc);
1884 /* perform minimal error analysis */
1885 if (qc->flags & ATA_QCFLAG_FAILED) {
1886 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1887 qc->err_mask |= AC_ERR_DEV;
1890 qc->err_mask |= AC_ERR_OTHER;
1892 if (qc->err_mask & ~AC_ERR_OTHER)
1893 qc->err_mask &= ~AC_ERR_OTHER;
1897 spin_lock_irqsave(ap->lock, flags);
1899 *tf = qc->result_tf;
1900 err_mask = qc->err_mask;
1903 link->active_tag = preempted_tag;
1904 link->sactive = preempted_sactive;
1905 ap->qc_active = preempted_qc_active;
1906 ap->nr_active_links = preempted_nr_active_links;
1908 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1909 * Until those drivers are fixed, we detect the condition
1910 * here, fail the command with AC_ERR_SYSTEM and reenable the
1913 * Note that this doesn't change any behavior as internal
1914 * command failure results in disabling the device in the
1915 * higher layer for LLDDs without new reset/EH callbacks.
1917 * Kill the following code as soon as those drivers are fixed.
1919 if (ap->flags & ATA_FLAG_DISABLED) {
1920 err_mask |= AC_ERR_SYSTEM;
1924 spin_unlock_irqrestore(ap->lock, flags);
1926 if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1927 ata_internal_cmd_timed_out(dev, command);
1933 * ata_exec_internal - execute libata internal command
1934 * @dev: Device to which the command is sent
1935 * @tf: Taskfile registers for the command and the result
1936 * @cdb: CDB for packet command
1937 * @dma_dir: Data tranfer direction of the command
1938 * @buf: Data buffer of the command
1939 * @buflen: Length of data buffer
1940 * @timeout: Timeout in msecs (0 for default)
1942 * Wrapper around ata_exec_internal_sg() which takes simple
1943 * buffer instead of sg list.
1946 * None. Should be called with kernel context, might sleep.
1949 * Zero on success, AC_ERR_* mask on failure
1951 unsigned ata_exec_internal(struct ata_device *dev,
1952 struct ata_taskfile *tf, const u8 *cdb,
1953 int dma_dir, void *buf, unsigned int buflen,
1954 unsigned long timeout)
1956 struct scatterlist *psg = NULL, sg;
1957 unsigned int n_elem = 0;
1959 if (dma_dir != DMA_NONE) {
1961 sg_init_one(&sg, buf, buflen);
1966 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1971 * ata_do_simple_cmd - execute simple internal command
1972 * @dev: Device to which the command is sent
1973 * @cmd: Opcode to execute
1975 * Execute a 'simple' command, that only consists of the opcode
1976 * 'cmd' itself, without filling any other registers
1979 * Kernel thread context (may sleep).
1982 * Zero on success, AC_ERR_* mask on failure
1984 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1986 struct ata_taskfile tf;
1988 ata_tf_init(dev, &tf);
1991 tf.flags |= ATA_TFLAG_DEVICE;
1992 tf.protocol = ATA_PROT_NODATA;
1994 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1998 * ata_pio_need_iordy - check if iordy needed
2001 * Check if the current speed of the device requires IORDY. Used
2002 * by various controllers for chip configuration.
2004 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
2006 /* Don't set IORDY if we're preparing for reset. IORDY may
2007 * lead to controller lock up on certain controllers if the
2008 * port is not occupied. See bko#11703 for details.
2010 if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
2012 /* Controller doesn't support IORDY. Probably a pointless
2013 * check as the caller should know this.
2015 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2017 /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6. */
2018 if (ata_id_is_cfa(adev->id)
2019 && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
2021 /* PIO3 and higher it is mandatory */
2022 if (adev->pio_mode > XFER_PIO_2)
2024 /* We turn it on when possible */
2025 if (ata_id_has_iordy(adev->id))
2031 * ata_pio_mask_no_iordy - Return the non IORDY mask
2034 * Compute the highest mode possible if we are not using iordy. Return
2035 * -1 if no iordy mode is available.
2037 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
2039 /* If we have no drive specific rule, then PIO 2 is non IORDY */
2040 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
2041 u16 pio = adev->id[ATA_ID_EIDE_PIO];
2042 /* Is the speed faster than the drive allows non IORDY ? */
2044 /* This is cycle times not frequency - watch the logic! */
2045 if (pio > 240) /* PIO2 is 240nS per cycle */
2046 return 3 << ATA_SHIFT_PIO;
2047 return 7 << ATA_SHIFT_PIO;
2050 return 3 << ATA_SHIFT_PIO;
2054 * ata_do_dev_read_id - default ID read method
2056 * @tf: proposed taskfile
2059 * Issue the identify taskfile and hand back the buffer containing
2060 * identify data. For some RAID controllers and for pre ATA devices
2061 * this function is wrapped or replaced by the driver
2063 unsigned int ata_do_dev_read_id(struct ata_device *dev,
2064 struct ata_taskfile *tf, u16 *id)
2066 return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
2067 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
2071 * ata_dev_read_id - Read ID data from the specified device
2072 * @dev: target device
2073 * @p_class: pointer to class of the target device (may be changed)
2074 * @flags: ATA_READID_* flags
2075 * @id: buffer to read IDENTIFY data into
2077 * Read ID data from the specified device. ATA_CMD_ID_ATA is
2078 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
2079 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
2080 * for pre-ATA4 drives.
2082 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2083 * now we abort if we hit that case.
2086 * Kernel thread context (may sleep)
2089 * 0 on success, -errno otherwise.
2091 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2092 unsigned int flags, u16 *id)
2094 struct ata_port *ap = dev->link->ap;
2095 unsigned int class = *p_class;
2096 struct ata_taskfile tf;
2097 unsigned int err_mask = 0;
2099 bool is_semb = class == ATA_DEV_SEMB;
2100 int may_fallback = 1, tried_spinup = 0;
2103 if (ata_msg_ctl(ap))
2104 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2107 ata_tf_init(dev, &tf);
2111 class = ATA_DEV_ATA; /* some hard drives report SEMB sig */
2113 tf.command = ATA_CMD_ID_ATA;
2116 tf.command = ATA_CMD_ID_ATAPI;
2120 reason = "unsupported class";
2124 tf.protocol = ATA_PROT_PIO;
2126 /* Some devices choke if TF registers contain garbage. Make
2127 * sure those are properly initialized.
2129 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2131 /* Device presence detection is unreliable on some
2132 * controllers. Always poll IDENTIFY if available.
2134 tf.flags |= ATA_TFLAG_POLLING;
2136 if (ap->ops->read_id)
2137 err_mask = ap->ops->read_id(dev, &tf, id);
2139 err_mask = ata_do_dev_read_id(dev, &tf, id);
2142 if (err_mask & AC_ERR_NODEV_HINT) {
2143 ata_dev_printk(dev, KERN_DEBUG,
2144 "NODEV after polling detection\n");
2149 ata_dev_printk(dev, KERN_INFO, "IDENTIFY failed on "
2150 "device w/ SEMB sig, disabled\n");
2151 /* SEMB is not supported yet */
2152 *p_class = ATA_DEV_SEMB_UNSUP;
2156 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
2157 /* Device or controller might have reported
2158 * the wrong device class. Give a shot at the
2159 * other IDENTIFY if the current one is
2160 * aborted by the device.
2165 if (class == ATA_DEV_ATA)
2166 class = ATA_DEV_ATAPI;
2168 class = ATA_DEV_ATA;
2172 /* Control reaches here iff the device aborted
2173 * both flavors of IDENTIFYs which happens
2174 * sometimes with phantom devices.
2176 ata_dev_printk(dev, KERN_DEBUG,
2177 "both IDENTIFYs aborted, assuming NODEV\n");
2182 reason = "I/O error";
2186 /* Falling back doesn't make sense if ID data was read
2187 * successfully at least once.
2191 swap_buf_le16(id, ATA_ID_WORDS);
2195 reason = "device reports invalid type";
2197 if (class == ATA_DEV_ATA) {
2198 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
2201 if (ata_id_is_ata(id))
2205 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2208 * Drive powered-up in standby mode, and requires a specific
2209 * SET_FEATURES spin-up subcommand before it will accept
2210 * anything other than the original IDENTIFY command.
2212 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2213 if (err_mask && id[2] != 0x738c) {
2215 reason = "SPINUP failed";
2219 * If the drive initially returned incomplete IDENTIFY info,
2220 * we now must reissue the IDENTIFY command.
2222 if (id[2] == 0x37c8)
2226 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2228 * The exact sequence expected by certain pre-ATA4 drives is:
2230 * IDENTIFY (optional in early ATA)
2231 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2233 * Some drives were very specific about that exact sequence.
2235 * Note that ATA4 says lba is mandatory so the second check
2236 * should never trigger.
2238 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2239 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2242 reason = "INIT_DEV_PARAMS failed";
2246 /* current CHS translation info (id[53-58]) might be
2247 * changed. reread the identify device info.
2249 flags &= ~ATA_READID_POSTRESET;
2259 if (ata_msg_warn(ap))
2260 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2261 "(%s, err_mask=0x%x)\n", reason, err_mask);
2265 static int ata_do_link_spd_horkage(struct ata_device *dev)
2267 struct ata_link *plink = ata_dev_phys_link(dev);
2268 u32 target, target_limit;
2270 if (!sata_scr_valid(plink))
2273 if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2278 target_limit = (1 << target) - 1;
2280 /* if already on stricter limit, no need to push further */
2281 if (plink->sata_spd_limit <= target_limit)
2284 plink->sata_spd_limit = target_limit;
2286 /* Request another EH round by returning -EAGAIN if link is
2287 * going faster than the target speed. Forward progress is
2288 * guaranteed by setting sata_spd_limit to target_limit above.
2290 if (plink->sata_spd > target) {
2291 ata_dev_printk(dev, KERN_INFO,
2292 "applying link speed limit horkage to %s\n",
2293 sata_spd_string(target));
2299 static inline u8 ata_dev_knobble(struct ata_device *dev)
2301 struct ata_port *ap = dev->link->ap;
2303 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2306 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2309 static int ata_dev_config_ncq(struct ata_device *dev,
2310 char *desc, size_t desc_sz)
2312 struct ata_port *ap = dev->link->ap;
2313 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2314 unsigned int err_mask;
2317 if (!ata_id_has_ncq(dev->id)) {
2321 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2322 snprintf(desc, desc_sz, "NCQ (not used)");
2325 if (ap->flags & ATA_FLAG_NCQ) {
2326 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2327 dev->flags |= ATA_DFLAG_NCQ;
2330 if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
2331 (ap->flags & ATA_FLAG_FPDMA_AA) &&
2332 ata_id_has_fpdma_aa(dev->id)) {
2333 err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
2336 ata_dev_printk(dev, KERN_ERR, "failed to enable AA"
2337 "(error_mask=0x%x)\n", err_mask);
2338 if (err_mask != AC_ERR_DEV) {
2339 dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
2346 if (hdepth >= ddepth)
2347 snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2349 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
2355 * ata_dev_configure - Configure the specified ATA/ATAPI device
2356 * @dev: Target device to configure
2358 * Configure @dev according to @dev->id. Generic and low-level
2359 * driver specific fixups are also applied.
2362 * Kernel thread context (may sleep)
2365 * 0 on success, -errno otherwise
2367 int ata_dev_configure(struct ata_device *dev)
2369 struct ata_port *ap = dev->link->ap;
2370 struct ata_eh_context *ehc = &dev->link->eh_context;
2371 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2372 const u16 *id = dev->id;
2373 unsigned long xfer_mask;
2374 char revbuf[7]; /* XYZ-99\0 */
2375 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2376 char modelbuf[ATA_ID_PROD_LEN+1];
2379 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2380 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2385 if (ata_msg_probe(ap))
2386 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2389 dev->horkage |= ata_dev_blacklisted(dev);
2390 ata_force_horkage(dev);
2392 if (dev->horkage & ATA_HORKAGE_DISABLE) {
2393 ata_dev_printk(dev, KERN_INFO,
2394 "unsupported device, disabling\n");
2395 ata_dev_disable(dev);
2399 if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2400 dev->class == ATA_DEV_ATAPI) {
2401 ata_dev_printk(dev, KERN_WARNING,
2402 "WARNING: ATAPI is %s, device ignored.\n",
2403 atapi_enabled ? "not supported with this driver"
2405 ata_dev_disable(dev);
2409 rc = ata_do_link_spd_horkage(dev);
2413 /* let ACPI work its magic */
2414 rc = ata_acpi_on_devcfg(dev);
2418 /* massage HPA, do it early as it might change IDENTIFY data */
2419 rc = ata_hpa_resize(dev);
2423 /* print device capabilities */
2424 if (ata_msg_probe(ap))
2425 ata_dev_printk(dev, KERN_DEBUG,
2426 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2427 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2429 id[49], id[82], id[83], id[84],
2430 id[85], id[86], id[87], id[88]);
2432 /* initialize to-be-configured parameters */
2433 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2434 dev->max_sectors = 0;
2440 dev->multi_count = 0;
2443 * common ATA, ATAPI feature tests
2446 /* find max transfer mode; for printk only */
2447 xfer_mask = ata_id_xfermask(id);
2449 if (ata_msg_probe(ap))
2452 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2453 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2456 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2459 /* ATA-specific feature tests */
2460 if (dev->class == ATA_DEV_ATA) {
2461 if (ata_id_is_cfa(id)) {
2462 /* CPRM may make this media unusable */
2463 if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2464 ata_dev_printk(dev, KERN_WARNING,
2465 "supports DRM functions and may "
2466 "not be fully accessable.\n");
2467 snprintf(revbuf, 7, "CFA");
2469 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2470 /* Warn the user if the device has TPM extensions */
2471 if (ata_id_has_tpm(id))
2472 ata_dev_printk(dev, KERN_WARNING,
2473 "supports DRM functions and may "
2474 "not be fully accessable.\n");
2477 dev->n_sectors = ata_id_n_sectors(id);
2479 /* get current R/W Multiple count setting */
2480 if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2481 unsigned int max = dev->id[47] & 0xff;
2482 unsigned int cnt = dev->id[59] & 0xff;
2483 /* only recognize/allow powers of two here */
2484 if (is_power_of_2(max) && is_power_of_2(cnt))
2486 dev->multi_count = cnt;
2489 if (ata_id_has_lba(id)) {
2490 const char *lba_desc;
2494 dev->flags |= ATA_DFLAG_LBA;
2495 if (ata_id_has_lba48(id)) {
2496 dev->flags |= ATA_DFLAG_LBA48;
2499 if (dev->n_sectors >= (1UL << 28) &&
2500 ata_id_has_flush_ext(id))
2501 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2505 rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2509 /* print device info to dmesg */
2510 if (ata_msg_drv(ap) && print_info) {
2511 ata_dev_printk(dev, KERN_INFO,
2512 "%s: %s, %s, max %s\n",
2513 revbuf, modelbuf, fwrevbuf,
2514 ata_mode_string(xfer_mask));
2515 ata_dev_printk(dev, KERN_INFO,
2516 "%Lu sectors, multi %u: %s %s\n",
2517 (unsigned long long)dev->n_sectors,
2518 dev->multi_count, lba_desc, ncq_desc);
2523 /* Default translation */
2524 dev->cylinders = id[1];
2526 dev->sectors = id[6];
2528 if (ata_id_current_chs_valid(id)) {
2529 /* Current CHS translation is valid. */
2530 dev->cylinders = id[54];
2531 dev->heads = id[55];
2532 dev->sectors = id[56];
2535 /* print device info to dmesg */
2536 if (ata_msg_drv(ap) && print_info) {
2537 ata_dev_printk(dev, KERN_INFO,
2538 "%s: %s, %s, max %s\n",
2539 revbuf, modelbuf, fwrevbuf,
2540 ata_mode_string(xfer_mask));
2541 ata_dev_printk(dev, KERN_INFO,
2542 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2543 (unsigned long long)dev->n_sectors,
2544 dev->multi_count, dev->cylinders,
2545 dev->heads, dev->sectors);
2552 /* ATAPI-specific feature tests */
2553 else if (dev->class == ATA_DEV_ATAPI) {
2554 const char *cdb_intr_string = "";
2555 const char *atapi_an_string = "";
2556 const char *dma_dir_string = "";
2559 rc = atapi_cdb_len(id);
2560 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2561 if (ata_msg_warn(ap))
2562 ata_dev_printk(dev, KERN_WARNING,
2563 "unsupported CDB len\n");
2567 dev->cdb_len = (unsigned int) rc;
2569 /* Enable ATAPI AN if both the host and device have
2570 * the support. If PMP is attached, SNTF is required
2571 * to enable ATAPI AN to discern between PHY status
2572 * changed notifications and ATAPI ANs.
2574 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2575 (!sata_pmp_attached(ap) ||
2576 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2577 unsigned int err_mask;
2579 /* issue SET feature command to turn this on */
2580 err_mask = ata_dev_set_feature(dev,
2581 SETFEATURES_SATA_ENABLE, SATA_AN);
2583 ata_dev_printk(dev, KERN_ERR,
2584 "failed to enable ATAPI AN "
2585 "(err_mask=0x%x)\n", err_mask);
2587 dev->flags |= ATA_DFLAG_AN;
2588 atapi_an_string = ", ATAPI AN";
2592 if (ata_id_cdb_intr(dev->id)) {
2593 dev->flags |= ATA_DFLAG_CDB_INTR;
2594 cdb_intr_string = ", CDB intr";
2597 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2598 dev->flags |= ATA_DFLAG_DMADIR;
2599 dma_dir_string = ", DMADIR";
2602 /* print device info to dmesg */
2603 if (ata_msg_drv(ap) && print_info)
2604 ata_dev_printk(dev, KERN_INFO,
2605 "ATAPI: %s, %s, max %s%s%s%s\n",
2607 ata_mode_string(xfer_mask),
2608 cdb_intr_string, atapi_an_string,
2612 /* determine max_sectors */
2613 dev->max_sectors = ATA_MAX_SECTORS;
2614 if (dev->flags & ATA_DFLAG_LBA48)
2615 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2617 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2618 if (ata_id_has_hipm(dev->id))
2619 dev->flags |= ATA_DFLAG_HIPM;
2620 if (ata_id_has_dipm(dev->id))
2621 dev->flags |= ATA_DFLAG_DIPM;
2624 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2626 if (ata_dev_knobble(dev)) {
2627 if (ata_msg_drv(ap) && print_info)
2628 ata_dev_printk(dev, KERN_INFO,
2629 "applying bridge limits\n");
2630 dev->udma_mask &= ATA_UDMA5;
2631 dev->max_sectors = ATA_MAX_SECTORS;
2634 if ((dev->class == ATA_DEV_ATAPI) &&
2635 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2636 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2637 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2640 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2641 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2644 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2645 dev->horkage |= ATA_HORKAGE_IPM;
2647 /* reset link pm_policy for this port to no pm */
2648 ap->pm_policy = MAX_PERFORMANCE;
2651 if (ap->ops->dev_config)
2652 ap->ops->dev_config(dev);
2654 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2655 /* Let the user know. We don't want to disallow opens for
2656 rescue purposes, or in case the vendor is just a blithering
2657 idiot. Do this after the dev_config call as some controllers
2658 with buggy firmware may want to avoid reporting false device
2662 ata_dev_printk(dev, KERN_WARNING,
2663 "Drive reports diagnostics failure. This may indicate a drive\n");
2664 ata_dev_printk(dev, KERN_WARNING,
2665 "fault or invalid emulation. Contact drive vendor for information.\n");
2669 if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2670 ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires "
2671 "firmware update to be fully functional.\n");
2672 ata_dev_printk(dev, KERN_WARNING, " contact the vendor "
2673 "or visit http://ata.wiki.kernel.org.\n");
2679 if (ata_msg_probe(ap))
2680 ata_dev_printk(dev, KERN_DEBUG,
2681 "%s: EXIT, err\n", __func__);
2686 * ata_cable_40wire - return 40 wire cable type
2689 * Helper method for drivers which want to hardwire 40 wire cable
2693 int ata_cable_40wire(struct ata_port *ap)
2695 return ATA_CBL_PATA40;
2699 * ata_cable_80wire - return 80 wire cable type
2702 * Helper method for drivers which want to hardwire 80 wire cable
2706 int ata_cable_80wire(struct ata_port *ap)
2708 return ATA_CBL_PATA80;
2712 * ata_cable_unknown - return unknown PATA cable.
2715 * Helper method for drivers which have no PATA cable detection.
2718 int ata_cable_unknown(struct ata_port *ap)
2720 return ATA_CBL_PATA_UNK;
2724 * ata_cable_ignore - return ignored PATA cable.
2727 * Helper method for drivers which don't use cable type to limit
2730 int ata_cable_ignore(struct ata_port *ap)
2732 return ATA_CBL_PATA_IGN;
2736 * ata_cable_sata - return SATA cable type
2739 * Helper method for drivers which have SATA cables
2742 int ata_cable_sata(struct ata_port *ap)
2744 return ATA_CBL_SATA;
2748 * ata_bus_probe - Reset and probe ATA bus
2751 * Master ATA bus probing function. Initiates a hardware-dependent
2752 * bus reset, then attempts to identify any devices found on
2756 * PCI/etc. bus probe sem.
2759 * Zero on success, negative errno otherwise.
2762 int ata_bus_probe(struct ata_port *ap)
2764 unsigned int classes[ATA_MAX_DEVICES];
2765 int tries[ATA_MAX_DEVICES];
2767 struct ata_device *dev;
2771 ata_for_each_dev(dev, &ap->link, ALL)
2772 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2775 ata_for_each_dev(dev, &ap->link, ALL) {
2776 /* If we issue an SRST then an ATA drive (not ATAPI)
2777 * may change configuration and be in PIO0 timing. If
2778 * we do a hard reset (or are coming from power on)
2779 * this is true for ATA or ATAPI. Until we've set a
2780 * suitable controller mode we should not touch the
2781 * bus as we may be talking too fast.
2783 dev->pio_mode = XFER_PIO_0;
2785 /* If the controller has a pio mode setup function
2786 * then use it to set the chipset to rights. Don't
2787 * touch the DMA setup as that will be dealt with when
2788 * configuring devices.
2790 if (ap->ops->set_piomode)
2791 ap->ops->set_piomode(ap, dev);
2794 /* reset and determine device classes */
2795 ap->ops->phy_reset(ap);
2797 ata_for_each_dev(dev, &ap->link, ALL) {
2798 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2799 dev->class != ATA_DEV_UNKNOWN)
2800 classes[dev->devno] = dev->class;
2802 classes[dev->devno] = ATA_DEV_NONE;
2804 dev->class = ATA_DEV_UNKNOWN;
2809 /* read IDENTIFY page and configure devices. We have to do the identify
2810 specific sequence bass-ackwards so that PDIAG- is released by
2813 ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2814 if (tries[dev->devno])
2815 dev->class = classes[dev->devno];
2817 if (!ata_dev_enabled(dev))
2820 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2826 /* Now ask for the cable type as PDIAG- should have been released */
2827 if (ap->ops->cable_detect)
2828 ap->cbl = ap->ops->cable_detect(ap);
2830 /* We may have SATA bridge glue hiding here irrespective of
2831 * the reported cable types and sensed types. When SATA
2832 * drives indicate we have a bridge, we don't know which end
2833 * of the link the bridge is which is a problem.
2835 ata_for_each_dev(dev, &ap->link, ENABLED)
2836 if (ata_id_is_sata(dev->id))
2837 ap->cbl = ATA_CBL_SATA;
2839 /* After the identify sequence we can now set up the devices. We do
2840 this in the normal order so that the user doesn't get confused */
2842 ata_for_each_dev(dev, &ap->link, ENABLED) {
2843 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2844 rc = ata_dev_configure(dev);
2845 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2850 /* configure transfer mode */
2851 rc = ata_set_mode(&ap->link, &dev);
2855 ata_for_each_dev(dev, &ap->link, ENABLED)
2858 /* no device present, disable port */
2859 ata_port_disable(ap);
2863 tries[dev->devno]--;
2867 /* eeek, something went very wrong, give up */
2868 tries[dev->devno] = 0;
2872 /* give it just one more chance */
2873 tries[dev->devno] = min(tries[dev->devno], 1);
2875 if (tries[dev->devno] == 1) {
2876 /* This is the last chance, better to slow
2877 * down than lose it.
2879 sata_down_spd_limit(&ap->link, 0);
2880 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2884 if (!tries[dev->devno])
2885 ata_dev_disable(dev);
2891 * ata_port_probe - Mark port as enabled
2892 * @ap: Port for which we indicate enablement
2894 * Modify @ap data structure such that the system
2895 * thinks that the entire port is enabled.
2897 * LOCKING: host lock, or some other form of
2901 void ata_port_probe(struct ata_port *ap)
2903 ap->flags &= ~ATA_FLAG_DISABLED;
2907 * sata_print_link_status - Print SATA link status
2908 * @link: SATA link to printk link status about
2910 * This function prints link speed and status of a SATA link.
2915 static void sata_print_link_status(struct ata_link *link)
2917 u32 sstatus, scontrol, tmp;
2919 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2921 sata_scr_read(link, SCR_CONTROL, &scontrol);
2923 if (ata_phys_link_online(link)) {
2924 tmp = (sstatus >> 4) & 0xf;
2925 ata_link_printk(link, KERN_INFO,
2926 "SATA link up %s (SStatus %X SControl %X)\n",
2927 sata_spd_string(tmp), sstatus, scontrol);
2929 ata_link_printk(link, KERN_INFO,
2930 "SATA link down (SStatus %X SControl %X)\n",
2936 * ata_dev_pair - return other device on cable
2939 * Obtain the other device on the same cable, or if none is
2940 * present NULL is returned
2943 struct ata_device *ata_dev_pair(struct ata_device *adev)
2945 struct ata_link *link = adev->link;
2946 struct ata_device *pair = &link->device[1 - adev->devno];
2947 if (!ata_dev_enabled(pair))
2953 * ata_port_disable - Disable port.
2954 * @ap: Port to be disabled.
2956 * Modify @ap data structure such that the system
2957 * thinks that the entire port is disabled, and should
2958 * never attempt to probe or communicate with devices
2961 * LOCKING: host lock, or some other form of
2965 void ata_port_disable(struct ata_port *ap)
2967 ap->link.device[0].class = ATA_DEV_NONE;
2968 ap->link.device[1].class = ATA_DEV_NONE;
2969 ap->flags |= ATA_FLAG_DISABLED;
2973 * sata_down_spd_limit - adjust SATA spd limit downward
2974 * @link: Link to adjust SATA spd limit for
2975 * @spd_limit: Additional limit
2977 * Adjust SATA spd limit of @link downward. Note that this
2978 * function only adjusts the limit. The change must be applied
2979 * using sata_set_spd().
2981 * If @spd_limit is non-zero, the speed is limited to equal to or
2982 * lower than @spd_limit if such speed is supported. If
2983 * @spd_limit is slower than any supported speed, only the lowest
2984 * supported speed is allowed.
2987 * Inherited from caller.
2990 * 0 on success, negative errno on failure
2992 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2994 u32 sstatus, spd, mask;
2997 if (!sata_scr_valid(link))
3000 /* If SCR can be read, use it to determine the current SPD.
3001 * If not, use cached value in link->sata_spd.
3003 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3004 if (rc == 0 && ata_sstatus_online(sstatus))
3005 spd = (sstatus >> 4) & 0xf;
3007 spd = link->sata_spd;
3009 mask = link->sata_spd_limit;
3013 /* unconditionally mask off the highest bit */
3014 bit = fls(mask) - 1;
3015 mask &= ~(1 << bit);
3017 /* Mask off all speeds higher than or equal to the current
3018 * one. Force 1.5Gbps if current SPD is not available.
3021 mask &= (1 << (spd - 1)) - 1;
3025 /* were we already at the bottom? */
3030 if (mask & ((1 << spd_limit) - 1))
3031 mask &= (1 << spd_limit) - 1;
3033 bit = ffs(mask) - 1;
3038 link->sata_spd_limit = mask;
3040 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
3041 sata_spd_string(fls(mask)));
3046 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3048 struct ata_link *host_link = &link->ap->link;
3049 u32 limit, target, spd;
3051 limit = link->sata_spd_limit;
3053 /* Don't configure downstream link faster than upstream link.
3054 * It doesn't speed up anything and some PMPs choke on such
3057 if (!ata_is_host_link(link) && host_link->sata_spd)
3058 limit &= (1 << host_link->sata_spd) - 1;
3060 if (limit == UINT_MAX)
3063 target = fls(limit);
3065 spd = (*scontrol >> 4) & 0xf;
3066 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3068 return spd != target;
3072 * sata_set_spd_needed - is SATA spd configuration needed
3073 * @link: Link in question
3075 * Test whether the spd limit in SControl matches
3076 * @link->sata_spd_limit. This function is used to determine
3077 * whether hardreset is necessary to apply SATA spd
3081 * Inherited from caller.
3084 * 1 if SATA spd configuration is needed, 0 otherwise.
3086 static int sata_set_spd_needed(struct ata_link *link)
3090 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3093 return __sata_set_spd_needed(link, &scontrol);
3097 * sata_set_spd - set SATA spd according to spd limit
3098 * @link: Link to set SATA spd for
3100 * Set SATA spd of @link according to sata_spd_limit.
3103 * Inherited from caller.
3106 * 0 if spd doesn't need to be changed, 1 if spd has been
3107 * changed. Negative errno if SCR registers are inaccessible.
3109 int sata_set_spd(struct ata_link *link)
3114 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3117 if (!__sata_set_spd_needed(link, &scontrol))
3120 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3127 * This mode timing computation functionality is ported over from
3128 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
3131 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
3132 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3133 * for UDMA6, which is currently supported only by Maxtor drives.
3135 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
3138 static const struct ata_timing ata_timing[] = {
3139 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0, 960, 0 }, */
3140 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 0, 600, 0 },
3141 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 0, 383, 0 },
3142 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 0, 240, 0 },
3143 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 0, 180, 0 },
3144 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 0, 120, 0 },
3145 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 0, 100, 0 },
3146 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 0, 80, 0 },
3148 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 50, 960, 0 },
3149 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 30, 480, 0 },
3150 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 20, 240, 0 },
3152 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 20, 480, 0 },
3153 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 5, 150, 0 },
3154 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 5, 120, 0 },
3155 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 5, 100, 0 },
3156 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 5, 80, 0 },
3158 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 0, 150 }, */
3159 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 0, 120 },
3160 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 0, 80 },
3161 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 0, 60 },
3162 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 0, 45 },
3163 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 0, 30 },
3164 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 0, 20 },
3165 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 0, 15 },
3170 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
3171 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
3173 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
3175 q->setup = EZ(t->setup * 1000, T);
3176 q->act8b = EZ(t->act8b * 1000, T);
3177 q->rec8b = EZ(t->rec8b * 1000, T);
3178 q->cyc8b = EZ(t->cyc8b * 1000, T);
3179 q->active = EZ(t->active * 1000, T);
3180 q->recover = EZ(t->recover * 1000, T);
3181 q->dmack_hold = EZ(t->dmack_hold * 1000, T);
3182 q->cycle = EZ(t->cycle * 1000, T);
3183 q->udma = EZ(t->udma * 1000, UT);
3186 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
3187 struct ata_timing *m, unsigned int what)
3189 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
3190 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
3191 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
3192 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
3193 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
3194 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
3195 if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
3196 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
3197 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
3200 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
3202 const struct ata_timing *t = ata_timing;
3204 while (xfer_mode > t->mode)
3207 if (xfer_mode == t->mode)
3212 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
3213 struct ata_timing *t, int T, int UT)
3215 const u16 *id = adev->id;
3216 const struct ata_timing *s;
3217 struct ata_timing p;
3223 if (!(s = ata_timing_find_mode(speed)))
3226 memcpy(t, s, sizeof(*s));
3229 * If the drive is an EIDE drive, it can tell us it needs extended
3230 * PIO/MW_DMA cycle timing.
3233 if (id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
3234 memset(&p, 0, sizeof(p));
3236 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
3237 if (speed <= XFER_PIO_2)
3238 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
3239 else if ((speed <= XFER_PIO_4) ||
3240 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
3241 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
3242 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
3243 p.cycle = id[ATA_ID_EIDE_DMA_MIN];
3245 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
3249 * Convert the timing to bus clock counts.
3252 ata_timing_quantize(t, t, T, UT);
3255 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
3256 * S.M.A.R.T * and some other commands. We have to ensure that the
3257 * DMA cycle timing is slower/equal than the fastest PIO timing.
3260 if (speed > XFER_PIO_6) {
3261 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
3262 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
3266 * Lengthen active & recovery time so that cycle time is correct.
3269 if (t->act8b + t->rec8b < t->cyc8b) {
3270 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
3271 t->rec8b = t->cyc8b - t->act8b;
3274 if (t->active + t->recover < t->cycle) {
3275 t->active += (t->cycle - (t->active + t->recover)) / 2;
3276 t->recover = t->cycle - t->active;
3279 /* In a few cases quantisation may produce enough errors to
3280 leave t->cycle too low for the sum of active and recovery
3281 if so we must correct this */
3282 if (t->active + t->recover > t->cycle)
3283 t->cycle = t->active + t->recover;
3289 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3290 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3291 * @cycle: cycle duration in ns
3293 * Return matching xfer mode for @cycle. The returned mode is of
3294 * the transfer type specified by @xfer_shift. If @cycle is too
3295 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
3296 * than the fastest known mode, the fasted mode is returned.
3302 * Matching xfer_mode, 0xff if no match found.
3304 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3306 u8 base_mode = 0xff, last_mode = 0xff;
3307 const struct ata_xfer_ent *ent;
3308 const struct ata_timing *t;
3310 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3311 if (ent->shift == xfer_shift)
3312 base_mode = ent->base;
3314 for (t = ata_timing_find_mode(base_mode);
3315 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3316 unsigned short this_cycle;
3318 switch (xfer_shift) {
3320 case ATA_SHIFT_MWDMA:
3321 this_cycle = t->cycle;
3323 case ATA_SHIFT_UDMA:
3324 this_cycle = t->udma;
3330 if (cycle > this_cycle)
3333 last_mode = t->mode;
3340 * ata_down_xfermask_limit - adjust dev xfer masks downward
3341 * @dev: Device to adjust xfer masks
3342 * @sel: ATA_DNXFER_* selector
3344 * Adjust xfer masks of @dev downward. Note that this function
3345 * does not apply the change. Invoking ata_set_mode() afterwards
3346 * will apply the limit.
3349 * Inherited from caller.
3352 * 0 on success, negative errno on failure
3354 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3357 unsigned long orig_mask, xfer_mask;
3358 unsigned long pio_mask, mwdma_mask, udma_mask;
3361 quiet = !!(sel & ATA_DNXFER_QUIET);
3362 sel &= ~ATA_DNXFER_QUIET;
3364 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3367 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3370 case ATA_DNXFER_PIO:
3371 highbit = fls(pio_mask) - 1;
3372 pio_mask &= ~(1 << highbit);
3375 case ATA_DNXFER_DMA:
3377 highbit = fls(udma_mask) - 1;
3378 udma_mask &= ~(1 << highbit);
3381 } else if (mwdma_mask) {
3382 highbit = fls(mwdma_mask) - 1;
3383 mwdma_mask &= ~(1 << highbit);
3389 case ATA_DNXFER_40C:
3390 udma_mask &= ATA_UDMA_MASK_40C;
3393 case ATA_DNXFER_FORCE_PIO0:
3395 case ATA_DNXFER_FORCE_PIO:
3404 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3406 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3410 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3411 snprintf(buf, sizeof(buf), "%s:%s",
3412 ata_mode_string(xfer_mask),
3413 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3415 snprintf(buf, sizeof(buf), "%s",
3416 ata_mode_string(xfer_mask));
3418 ata_dev_printk(dev, KERN_WARNING,
3419 "limiting speed to %s\n", buf);
3422 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3428 static int ata_dev_set_mode(struct ata_device *dev)
3430 struct ata_port *ap = dev->link->ap;
3431 struct ata_eh_context *ehc = &dev->link->eh_context;
3432 const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3433 const char *dev_err_whine = "";
3434 int ign_dev_err = 0;
3435 unsigned int err_mask = 0;
3438 dev->flags &= ~ATA_DFLAG_PIO;
3439 if (dev->xfer_shift == ATA_SHIFT_PIO)
3440 dev->flags |= ATA_DFLAG_PIO;
3442 if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3443 dev_err_whine = " (SET_XFERMODE skipped)";
3446 ata_dev_printk(dev, KERN_WARNING,
3447 "NOSETXFER but PATA detected - can't "
3448 "skip SETXFER, might malfunction\n");
3449 err_mask = ata_dev_set_xfermode(dev);
3452 if (err_mask & ~AC_ERR_DEV)
3456 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3457 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3458 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3462 if (dev->xfer_shift == ATA_SHIFT_PIO) {
3463 /* Old CFA may refuse this command, which is just fine */
3464 if (ata_id_is_cfa(dev->id))
3466 /* Catch several broken garbage emulations plus some pre
3468 if (ata_id_major_version(dev->id) == 0 &&
3469 dev->pio_mode <= XFER_PIO_2)
3471 /* Some very old devices and some bad newer ones fail
3472 any kind of SET_XFERMODE request but support PIO0-2
3473 timings and no IORDY */
3474 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3477 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3478 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3479 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3480 dev->dma_mode == XFER_MW_DMA_0 &&
3481 (dev->id[63] >> 8) & 1)
3484 /* if the device is actually configured correctly, ignore dev err */
3485 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3488 if (err_mask & AC_ERR_DEV) {
3492 dev_err_whine = " (device error ignored)";
3495 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3496 dev->xfer_shift, (int)dev->xfer_mode);
3498 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3499 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3505 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3506 "(err_mask=0x%x)\n", err_mask);
3511 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3512 * @link: link on which timings will be programmed
3513 * @r_failed_dev: out parameter for failed device
3515 * Standard implementation of the function used to tune and set
3516 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3517 * ata_dev_set_mode() fails, pointer to the failing device is
3518 * returned in @r_failed_dev.
3521 * PCI/etc. bus probe sem.
3524 * 0 on success, negative errno otherwise
3527 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3529 struct ata_port *ap = link->ap;
3530 struct ata_device *dev;
3531 int rc = 0, used_dma = 0, found = 0;
3533 /* step 1: calculate xfer_mask */
3534 ata_for_each_dev(dev, link, ENABLED) {
3535 unsigned long pio_mask, dma_mask;
3536 unsigned int mode_mask;
3538 mode_mask = ATA_DMA_MASK_ATA;
3539 if (dev->class == ATA_DEV_ATAPI)
3540 mode_mask = ATA_DMA_MASK_ATAPI;
3541 else if (ata_id_is_cfa(dev->id))
3542 mode_mask = ATA_DMA_MASK_CFA;
3544 ata_dev_xfermask(dev);
3545 ata_force_xfermask(dev);
3547 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3548 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3550 if (libata_dma_mask & mode_mask)
3551 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3555 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3556 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3559 if (ata_dma_enabled(dev))
3565 /* step 2: always set host PIO timings */
3566 ata_for_each_dev(dev, link, ENABLED) {
3567 if (dev->pio_mode == 0xff) {
3568 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3573 dev->xfer_mode = dev->pio_mode;
3574 dev->xfer_shift = ATA_SHIFT_PIO;
3575 if (ap->ops->set_piomode)
3576 ap->ops->set_piomode(ap, dev);
3579 /* step 3: set host DMA timings */
3580 ata_for_each_dev(dev, link, ENABLED) {
3581 if (!ata_dma_enabled(dev))
3584 dev->xfer_mode = dev->dma_mode;
3585 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3586 if (ap->ops->set_dmamode)
3587 ap->ops->set_dmamode(ap, dev);
3590 /* step 4: update devices' xfer mode */
3591 ata_for_each_dev(dev, link, ENABLED) {
3592 rc = ata_dev_set_mode(dev);
3597 /* Record simplex status. If we selected DMA then the other
3598 * host channels are not permitted to do so.
3600 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3601 ap->host->simplex_claimed = ap;
3605 *r_failed_dev = dev;
3610 * ata_wait_ready - wait for link to become ready
3611 * @link: link to be waited on
3612 * @deadline: deadline jiffies for the operation
3613 * @check_ready: callback to check link readiness
3615 * Wait for @link to become ready. @check_ready should return
3616 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3617 * link doesn't seem to be occupied, other errno for other error
3620 * Transient -ENODEV conditions are allowed for
3621 * ATA_TMOUT_FF_WAIT.
3627 * 0 if @linke is ready before @deadline; otherwise, -errno.
3629 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3630 int (*check_ready)(struct ata_link *link))
3632 unsigned long start = jiffies;
3633 unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3636 /* Slave readiness can't be tested separately from master. On
3637 * M/S emulation configuration, this function should be called
3638 * only on the master and it will handle both master and slave.
3640 WARN_ON(link == link->ap->slave_link);
3642 if (time_after(nodev_deadline, deadline))
3643 nodev_deadline = deadline;
3646 unsigned long now = jiffies;
3649 ready = tmp = check_ready(link);
3653 /* -ENODEV could be transient. Ignore -ENODEV if link
3654 * is online. Also, some SATA devices take a long
3655 * time to clear 0xff after reset. For example,
3656 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3657 * GoVault needs even more than that. Wait for
3658 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3660 * Note that some PATA controllers (pata_ali) explode
3661 * if status register is read more than once when
3662 * there's no device attached.
3664 if (ready == -ENODEV) {
3665 if (ata_link_online(link))
3667 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3668 !ata_link_offline(link) &&
3669 time_before(now, nodev_deadline))
3675 if (time_after(now, deadline))
3678 if (!warned && time_after(now, start + 5 * HZ) &&
3679 (deadline - now > 3 * HZ)) {
3680 ata_link_printk(link, KERN_WARNING,
3681 "link is slow to respond, please be patient "
3682 "(ready=%d)\n", tmp);
3691 * ata_wait_after_reset - wait for link to become ready after reset
3692 * @link: link to be waited on
3693 * @deadline: deadline jiffies for the operation
3694 * @check_ready: callback to check link readiness
3696 * Wait for @link to become ready after reset.
3702 * 0 if @linke is ready before @deadline; otherwise, -errno.
3704 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3705 int (*check_ready)(struct ata_link *link))
3707 msleep(ATA_WAIT_AFTER_RESET);
3709 return ata_wait_ready(link, deadline, check_ready);
3713 * sata_link_debounce - debounce SATA phy status
3714 * @link: ATA link to debounce SATA phy status for
3715 * @params: timing parameters { interval, duratinon, timeout } in msec
3716 * @deadline: deadline jiffies for the operation
3718 * Make sure SStatus of @link reaches stable state, determined by
3719 * holding the same value where DET is not 1 for @duration polled
3720 * every @interval, before @timeout. Timeout constraints the
3721 * beginning of the stable state. Because DET gets stuck at 1 on
3722 * some controllers after hot unplugging, this functions waits
3723 * until timeout then returns 0 if DET is stable at 1.
3725 * @timeout is further limited by @deadline. The sooner of the
3729 * Kernel thread context (may sleep)
3732 * 0 on success, -errno on failure.
3734 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3735 unsigned long deadline)
3737 unsigned long interval = params[0];
3738 unsigned long duration = params[1];
3739 unsigned long last_jiffies, t;
3743 t = ata_deadline(jiffies, params[2]);
3744 if (time_before(t, deadline))
3747 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3752 last_jiffies = jiffies;
3756 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3762 if (cur == 1 && time_before(jiffies, deadline))
3764 if (time_after(jiffies,
3765 ata_deadline(last_jiffies, duration)))
3770 /* unstable, start over */
3772 last_jiffies = jiffies;
3774 /* Check deadline. If debouncing failed, return
3775 * -EPIPE to tell upper layer to lower link speed.
3777 if (time_after(jiffies, deadline))
3783 * sata_link_resume - resume SATA link
3784 * @link: ATA link to resume SATA
3785 * @params: timing parameters { interval, duratinon, timeout } in msec
3786 * @deadline: deadline jiffies for the operation
3788 * Resume SATA phy @link and debounce it.
3791 * Kernel thread context (may sleep)
3794 * 0 on success, -errno on failure.
3796 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3797 unsigned long deadline)
3799 int tries = ATA_LINK_RESUME_TRIES;
3800 u32 scontrol, serror;
3803 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3807 * Writes to SControl sometimes get ignored under certain
3808 * controllers (ata_piix SIDPR). Make sure DET actually is
3812 scontrol = (scontrol & 0x0f0) | 0x300;
3813 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3816 * Some PHYs react badly if SStatus is pounded
3817 * immediately after resuming. Delay 200ms before
3822 /* is SControl restored correctly? */
3823 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3825 } while ((scontrol & 0xf0f) != 0x300 && --tries);
3827 if ((scontrol & 0xf0f) != 0x300) {
3828 ata_link_printk(link, KERN_ERR,
3829 "failed to resume link (SControl %X)\n",
3834 if (tries < ATA_LINK_RESUME_TRIES)
3835 ata_link_printk(link, KERN_WARNING,
3836 "link resume succeeded after %d retries\n",
3837 ATA_LINK_RESUME_TRIES - tries);
3839 if ((rc = sata_link_debounce(link, params, deadline)))
3842 /* clear SError, some PHYs require this even for SRST to work */
3843 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3844 rc = sata_scr_write(link, SCR_ERROR, serror);
3846 return rc != -EINVAL ? rc : 0;
3850 * ata_std_prereset - prepare for reset
3851 * @link: ATA link to be reset
3852 * @deadline: deadline jiffies for the operation
3854 * @link is about to be reset. Initialize it. Failure from
3855 * prereset makes libata abort whole reset sequence and give up
3856 * that port, so prereset should be best-effort. It does its
3857 * best to prepare for reset sequence but if things go wrong, it
3858 * should just whine, not fail.
3861 * Kernel thread context (may sleep)
3864 * 0 on success, -errno otherwise.
3866 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3868 struct ata_port *ap = link->ap;
3869 struct ata_eh_context *ehc = &link->eh_context;
3870 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3873 /* if we're about to do hardreset, nothing more to do */
3874 if (ehc->i.action & ATA_EH_HARDRESET)
3877 /* if SATA, resume link */
3878 if (ap->flags & ATA_FLAG_SATA) {
3879 rc = sata_link_resume(link, timing, deadline);
3880 /* whine about phy resume failure but proceed */
3881 if (rc && rc != -EOPNOTSUPP)
3882 ata_link_printk(link, KERN_WARNING, "failed to resume "
3883 "link for reset (errno=%d)\n", rc);
3886 /* no point in trying softreset on offline link */
3887 if (ata_phys_link_offline(link))
3888 ehc->i.action &= ~ATA_EH_SOFTRESET;
3894 * sata_link_hardreset - reset link via SATA phy reset
3895 * @link: link to reset
3896 * @timing: timing parameters { interval, duratinon, timeout } in msec
3897 * @deadline: deadline jiffies for the operation
3898 * @online: optional out parameter indicating link onlineness
3899 * @check_ready: optional callback to check link readiness
3901 * SATA phy-reset @link using DET bits of SControl register.
3902 * After hardreset, link readiness is waited upon using
3903 * ata_wait_ready() if @check_ready is specified. LLDs are
3904 * allowed to not specify @check_ready and wait itself after this
3905 * function returns. Device classification is LLD's
3908 * *@online is set to one iff reset succeeded and @link is online
3912 * Kernel thread context (may sleep)
3915 * 0 on success, -errno otherwise.
3917 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3918 unsigned long deadline,
3919 bool *online, int (*check_ready)(struct ata_link *))
3929 if (sata_set_spd_needed(link)) {
3930 /* SATA spec says nothing about how to reconfigure
3931 * spd. To be on the safe side, turn off phy during
3932 * reconfiguration. This works for at least ICH7 AHCI
3935 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3938 scontrol = (scontrol & 0x0f0) | 0x304;
3940 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3946 /* issue phy wake/reset */
3947 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3950 scontrol = (scontrol & 0x0f0) | 0x301;
3952 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3955 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3956 * 10.4.2 says at least 1 ms.
3960 /* bring link back */
3961 rc = sata_link_resume(link, timing, deadline);
3964 /* if link is offline nothing more to do */
3965 if (ata_phys_link_offline(link))
3968 /* Link is online. From this point, -ENODEV too is an error. */
3972 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3973 /* If PMP is supported, we have to do follow-up SRST.
3974 * Some PMPs don't send D2H Reg FIS after hardreset if
3975 * the first port is empty. Wait only for
3976 * ATA_TMOUT_PMP_SRST_WAIT.
3979 unsigned long pmp_deadline;
3981 pmp_deadline = ata_deadline(jiffies,
3982 ATA_TMOUT_PMP_SRST_WAIT);
3983 if (time_after(pmp_deadline, deadline))
3984 pmp_deadline = deadline;
3985 ata_wait_ready(link, pmp_deadline, check_ready);
3993 rc = ata_wait_ready(link, deadline, check_ready);
3995 if (rc && rc != -EAGAIN) {
3996 /* online is set iff link is online && reset succeeded */
3999 ata_link_printk(link, KERN_ERR,
4000 "COMRESET failed (errno=%d)\n", rc);
4002 DPRINTK("EXIT, rc=%d\n", rc);
4007 * sata_std_hardreset - COMRESET w/o waiting or classification
4008 * @link: link to reset
4009 * @class: resulting class of attached device
4010 * @deadline: deadline jiffies for the operation
4012 * Standard SATA COMRESET w/o waiting or classification.
4015 * Kernel thread context (may sleep)
4018 * 0 if link offline, -EAGAIN if link online, -errno on errors.
4020 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
4021 unsigned long deadline)
4023 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
4028 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
4029 return online ? -EAGAIN : rc;
4033 * ata_std_postreset - standard postreset callback
4034 * @link: the target ata_link
4035 * @classes: classes of attached devices
4037 * This function is invoked after a successful reset. Note that
4038 * the device might have been reset more than once using
4039 * different reset methods before postreset is invoked.
4042 * Kernel thread context (may sleep)
4044 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4050 /* reset complete, clear SError */
4051 if (!sata_scr_read(link, SCR_ERROR, &serror))
4052 sata_scr_write(link, SCR_ERROR, serror);
4054 /* print link status */
4055 sata_print_link_status(link);
4061 * ata_dev_same_device - Determine whether new ID matches configured device
4062 * @dev: device to compare against
4063 * @new_class: class of the new device
4064 * @new_id: IDENTIFY page of the new device
4066 * Compare @new_class and @new_id against @dev and determine
4067 * whether @dev is the device indicated by @new_class and
4074 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
4076 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
4079 const u16 *old_id = dev->id;
4080 unsigned char model[2][ATA_ID_PROD_LEN + 1];
4081 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4083 if (dev->class != new_class) {
4084 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
4085 dev->class, new_class);
4089 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
4090 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
4091 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
4092 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4094 if (strcmp(model[0], model[1])) {
4095 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
4096 "'%s' != '%s'\n", model[0], model[1]);
4100 if (strcmp(serial[0], serial[1])) {
4101 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
4102 "'%s' != '%s'\n", serial[0], serial[1]);
4110 * ata_dev_reread_id - Re-read IDENTIFY data
4111 * @dev: target ATA device
4112 * @readid_flags: read ID flags
4114 * Re-read IDENTIFY page and make sure @dev is still attached to
4118 * Kernel thread context (may sleep)
4121 * 0 on success, negative errno otherwise
4123 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4125 unsigned int class = dev->class;
4126 u16 *id = (void *)dev->link->ap->sector_buf;
4130 rc = ata_dev_read_id(dev, &class, readid_flags, id);
4134 /* is the device still there? */
4135 if (!ata_dev_same_device(dev, class, id))
4138 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4143 * ata_dev_revalidate - Revalidate ATA device
4144 * @dev: device to revalidate
4145 * @new_class: new class code
4146 * @readid_flags: read ID flags
4148 * Re-read IDENTIFY page, make sure @dev is still attached to the
4149 * port and reconfigure it according to the new IDENTIFY page.
4152 * Kernel thread context (may sleep)
4155 * 0 on success, negative errno otherwise
4157 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4158 unsigned int readid_flags)
4160 u64 n_sectors = dev->n_sectors;
4161 u64 n_native_sectors = dev->n_native_sectors;
4164 if (!ata_dev_enabled(dev))
4167 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4168 if (ata_class_enabled(new_class) &&
4169 new_class != ATA_DEV_ATA &&
4170 new_class != ATA_DEV_ATAPI &&
4171 new_class != ATA_DEV_SEMB) {
4172 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
4173 dev->class, new_class);
4179 rc = ata_dev_reread_id(dev, readid_flags);
4183 /* configure device according to the new ID */
4184 rc = ata_dev_configure(dev);
4188 /* verify n_sectors hasn't changed */
4189 if (dev->class == ATA_DEV_ATA && n_sectors &&
4190 dev->n_sectors != n_sectors) {
4191 ata_dev_printk(dev, KERN_WARNING, "n_sectors mismatch "
4193 (unsigned long long)n_sectors,
4194 (unsigned long long)dev->n_sectors);
4196 * Something could have caused HPA to be unlocked
4197 * involuntarily. If n_native_sectors hasn't changed
4198 * and the new size matches it, keep the device.
4200 if (dev->n_native_sectors == n_native_sectors &&
4201 dev->n_sectors > n_sectors &&
4202 dev->n_sectors == n_native_sectors) {
4203 ata_dev_printk(dev, KERN_WARNING,
4204 "new n_sectors matches native, probably "
4205 "late HPA unlock, continuing\n");
4206 /* keep using the old n_sectors */
4207 dev->n_sectors = n_sectors;
4209 /* restore original n_[native]_sectors and fail */
4210 dev->n_native_sectors = n_native_sectors;
4211 dev->n_sectors = n_sectors;
4220 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4224 struct ata_blacklist_entry {
4225 const char *model_num;
4226 const char *model_rev;
4227 unsigned long horkage;
4230 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4231 /* Devices with DMA related problems under Linux */
4232 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4233 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4234 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4235 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4236 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4237 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4238 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4239 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4240 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4241 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
4242 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
4243 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4244 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4245 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4246 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4247 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4248 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
4249 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
4250 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4251 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4252 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4253 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4254 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4255 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4256 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4257 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4258 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4259 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4260 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4261 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4262 /* Odd clown on sil3726/4726 PMPs */
4263 { "Config Disk", NULL, ATA_HORKAGE_DISABLE },
4265 /* Weird ATAPI devices */
4266 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4267 { "QUANTUM DAT DAT72-000", NULL, ATA_HORKAGE_ATAPI_MOD16_DMA },
4269 /* Devices we expect to fail diagnostics */
4271 /* Devices where NCQ should be avoided */
4273 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4274 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4275 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4276 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4278 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4279 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4280 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4281 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4282 { "OCZ CORE_SSD", "02.10104", ATA_HORKAGE_NONCQ },
4284 /* Seagate NCQ + FLUSH CACHE firmware bug */
4285 { "ST31500341AS", "SD15", ATA_HORKAGE_NONCQ |
4286 ATA_HORKAGE_FIRMWARE_WARN },
4287 { "ST31500341AS", "SD16", ATA_HORKAGE_NONCQ |
4288 ATA_HORKAGE_FIRMWARE_WARN },
4289 { "ST31500341AS", "SD17", ATA_HORKAGE_NONCQ |
4290 ATA_HORKAGE_FIRMWARE_WARN },
4291 { "ST31500341AS", "SD18", ATA_HORKAGE_NONCQ |
4292 ATA_HORKAGE_FIRMWARE_WARN },
4293 { "ST31500341AS", "SD19", ATA_HORKAGE_NONCQ |
4294 ATA_HORKAGE_FIRMWARE_WARN },
4296 { "ST31000333AS", "SD15", ATA_HORKAGE_NONCQ |
4297 ATA_HORKAGE_FIRMWARE_WARN },
4298 { "ST31000333AS", "SD16", ATA_HORKAGE_NONCQ |
4299 ATA_HORKAGE_FIRMWARE_WARN },
4300 { "ST31000333AS", "SD17", ATA_HORKAGE_NONCQ |
4301 ATA_HORKAGE_FIRMWARE_WARN },
4302 { "ST31000333AS", "SD18", ATA_HORKAGE_NONCQ |
4303 ATA_HORKAGE_FIRMWARE_WARN },
4304 { "ST31000333AS", "SD19", ATA_HORKAGE_NONCQ |
4305 ATA_HORKAGE_FIRMWARE_WARN },
4307 { "ST3640623AS", "SD15", ATA_HORKAGE_NONCQ |
4308 ATA_HORKAGE_FIRMWARE_WARN },
4309 { "ST3640623AS", "SD16", ATA_HORKAGE_NONCQ |
4310 ATA_HORKAGE_FIRMWARE_WARN },
4311 { "ST3640623AS", "SD17", ATA_HORKAGE_NONCQ |
4312 ATA_HORKAGE_FIRMWARE_WARN },
4313 { "ST3640623AS", "SD18", ATA_HORKAGE_NONCQ |
4314 ATA_HORKAGE_FIRMWARE_WARN },
4315 { "ST3640623AS", "SD19", ATA_HORKAGE_NONCQ |
4316 ATA_HORKAGE_FIRMWARE_WARN },
4318 { "ST3640323AS", "SD15", ATA_HORKAGE_NONCQ |
4319 ATA_HORKAGE_FIRMWARE_WARN },
4320 { "ST3640323AS", "SD16", ATA_HORKAGE_NONCQ |
4321 ATA_HORKAGE_FIRMWARE_WARN },
4322 { "ST3640323AS", "SD17", ATA_HORKAGE_NONCQ |
4323 ATA_HORKAGE_FIRMWARE_WARN },
4324 { "ST3640323AS", "SD18", ATA_HORKAGE_NONCQ |
4325 ATA_HORKAGE_FIRMWARE_WARN },
4326 { "ST3640323AS", "SD19", ATA_HORKAGE_NONCQ |
4327 ATA_HORKAGE_FIRMWARE_WARN },
4329 { "ST3320813AS", "SD15", ATA_HORKAGE_NONCQ |
4330 ATA_HORKAGE_FIRMWARE_WARN },
4331 { "ST3320813AS", "SD16", ATA_HORKAGE_NONCQ |
4332 ATA_HORKAGE_FIRMWARE_WARN },
4333 { "ST3320813AS", "SD17", ATA_HORKAGE_NONCQ |
4334 ATA_HORKAGE_FIRMWARE_WARN },
4335 { "ST3320813AS", "SD18", ATA_HORKAGE_NONCQ |
4336 ATA_HORKAGE_FIRMWARE_WARN },
4337 { "ST3320813AS", "SD19", ATA_HORKAGE_NONCQ |
4338 ATA_HORKAGE_FIRMWARE_WARN },
4340 { "ST3320613AS", "SD15", ATA_HORKAGE_NONCQ |
4341 ATA_HORKAGE_FIRMWARE_WARN },
4342 { "ST3320613AS", "SD16", ATA_HORKAGE_NONCQ |
4343 ATA_HORKAGE_FIRMWARE_WARN },
4344 { "ST3320613AS", "SD17", ATA_HORKAGE_NONCQ |
4345 ATA_HORKAGE_FIRMWARE_WARN },
4346 { "ST3320613AS", "SD18", ATA_HORKAGE_NONCQ |
4347 ATA_HORKAGE_FIRMWARE_WARN },
4348 { "ST3320613AS", "SD19", ATA_HORKAGE_NONCQ |
4349 ATA_HORKAGE_FIRMWARE_WARN },
4351 /* Blacklist entries taken from Silicon Image 3124/3132
4352 Windows driver .inf file - also several Linux problem reports */
4353 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4354 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4355 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4357 /* devices which puke on READ_NATIVE_MAX */
4358 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4359 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4360 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4361 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4363 /* this one allows HPA unlocking but fails IOs on the area */
4364 { "OCZ-VERTEX", "1.30", ATA_HORKAGE_BROKEN_HPA },
4366 /* Devices which report 1 sector over size HPA */
4367 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4368 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4369 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
4371 /* Devices which get the IVB wrong */
4372 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4373 /* Maybe we should just blacklist TSSTcorp... */
4374 { "TSSTcorp CDDVDW SH-S202H", "SB00", ATA_HORKAGE_IVB, },
4375 { "TSSTcorp CDDVDW SH-S202H", "SB01", ATA_HORKAGE_IVB, },
4376 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
4377 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
4378 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
4379 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
4381 /* Devices that do not need bridging limits applied */
4382 { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, },
4384 /* Devices which aren't very happy with higher link speeds */
4385 { "WD My Book", NULL, ATA_HORKAGE_1_5_GBPS, },
4388 * Devices which choke on SETXFER. Applies only if both the
4389 * device and controller are SATA.
4391 { "PIONEER DVD-RW DVRTD08", "1.00", ATA_HORKAGE_NOSETXFER },
4397 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4403 * check for trailing wildcard: *\0
4405 p = strchr(patt, wildchar);
4406 if (p && ((*(p + 1)) == 0))
4417 return strncmp(patt, name, len);
4420 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4422 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4423 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4424 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4426 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4427 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4429 while (ad->model_num) {
4430 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4431 if (ad->model_rev == NULL)
4433 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4441 static int ata_dma_blacklisted(const struct ata_device *dev)
4443 /* We don't support polling DMA.
4444 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4445 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4447 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4448 (dev->flags & ATA_DFLAG_CDB_INTR))
4450 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4454 * ata_is_40wire - check drive side detection
4457 * Perform drive side detection decoding, allowing for device vendors
4458 * who can't follow the documentation.
4461 static int ata_is_40wire(struct ata_device *dev)
4463 if (dev->horkage & ATA_HORKAGE_IVB)
4464 return ata_drive_40wire_relaxed(dev->id);
4465 return ata_drive_40wire(dev->id);
4469 * cable_is_40wire - 40/80/SATA decider
4470 * @ap: port to consider
4472 * This function encapsulates the policy for speed management
4473 * in one place. At the moment we don't cache the result but
4474 * there is a good case for setting ap->cbl to the result when
4475 * we are called with unknown cables (and figuring out if it
4476 * impacts hotplug at all).
4478 * Return 1 if the cable appears to be 40 wire.
4481 static int cable_is_40wire(struct ata_port *ap)
4483 struct ata_link *link;
4484 struct ata_device *dev;
4486 /* If the controller thinks we are 40 wire, we are. */
4487 if (ap->cbl == ATA_CBL_PATA40)
4490 /* If the controller thinks we are 80 wire, we are. */
4491 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4494 /* If the system is known to be 40 wire short cable (eg
4495 * laptop), then we allow 80 wire modes even if the drive
4498 if (ap->cbl == ATA_CBL_PATA40_SHORT)
4501 /* If the controller doesn't know, we scan.
4503 * Note: We look for all 40 wire detects at this point. Any
4504 * 80 wire detect is taken to be 80 wire cable because
4505 * - in many setups only the one drive (slave if present) will
4506 * give a valid detect
4507 * - if you have a non detect capable drive you don't want it
4508 * to colour the choice
4510 ata_for_each_link(link, ap, EDGE) {
4511 ata_for_each_dev(dev, link, ENABLED) {
4512 if (!ata_is_40wire(dev))
4520 * ata_dev_xfermask - Compute supported xfermask of the given device
4521 * @dev: Device to compute xfermask for
4523 * Compute supported xfermask of @dev and store it in
4524 * dev->*_mask. This function is responsible for applying all
4525 * known limits including host controller limits, device
4531 static void ata_dev_xfermask(struct ata_device *dev)
4533 struct ata_link *link = dev->link;
4534 struct ata_port *ap = link->ap;
4535 struct ata_host *host = ap->host;
4536 unsigned long xfer_mask;
4538 /* controller modes available */
4539 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4540 ap->mwdma_mask, ap->udma_mask);
4542 /* drive modes available */
4543 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4544 dev->mwdma_mask, dev->udma_mask);
4545 xfer_mask &= ata_id_xfermask(dev->id);
4548 * CFA Advanced TrueIDE timings are not allowed on a shared
4551 if (ata_dev_pair(dev)) {
4552 /* No PIO5 or PIO6 */
4553 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4554 /* No MWDMA3 or MWDMA 4 */
4555 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4558 if (ata_dma_blacklisted(dev)) {
4559 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4560 ata_dev_printk(dev, KERN_WARNING,
4561 "device is on DMA blacklist, disabling DMA\n");
4564 if ((host->flags & ATA_HOST_SIMPLEX) &&
4565 host->simplex_claimed && host->simplex_claimed != ap) {
4566 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4567 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4568 "other device, disabling DMA\n");
4571 if (ap->flags & ATA_FLAG_NO_IORDY)
4572 xfer_mask &= ata_pio_mask_no_iordy(dev);
4574 if (ap->ops->mode_filter)
4575 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4577 /* Apply cable rule here. Don't apply it early because when
4578 * we handle hot plug the cable type can itself change.
4579 * Check this last so that we know if the transfer rate was
4580 * solely limited by the cable.
4581 * Unknown or 80 wire cables reported host side are checked
4582 * drive side as well. Cases where we know a 40wire cable
4583 * is used safely for 80 are not checked here.
4585 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4586 /* UDMA/44 or higher would be available */
4587 if (cable_is_40wire(ap)) {
4588 ata_dev_printk(dev, KERN_WARNING,
4589 "limited to UDMA/33 due to 40-wire cable\n");
4590 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4593 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4594 &dev->mwdma_mask, &dev->udma_mask);
4598 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4599 * @dev: Device to which command will be sent
4601 * Issue SET FEATURES - XFER MODE command to device @dev
4605 * PCI/etc. bus probe sem.
4608 * 0 on success, AC_ERR_* mask otherwise.
4611 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4613 struct ata_taskfile tf;
4614 unsigned int err_mask;
4616 /* set up set-features taskfile */
4617 DPRINTK("set features - xfer mode\n");
4619 /* Some controllers and ATAPI devices show flaky interrupt
4620 * behavior after setting xfer mode. Use polling instead.
4622 ata_tf_init(dev, &tf);
4623 tf.command = ATA_CMD_SET_FEATURES;
4624 tf.feature = SETFEATURES_XFER;
4625 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4626 tf.protocol = ATA_PROT_NODATA;
4627 /* If we are using IORDY we must send the mode setting command */
4628 if (ata_pio_need_iordy(dev))
4629 tf.nsect = dev->xfer_mode;
4630 /* If the device has IORDY and the controller does not - turn it off */
4631 else if (ata_id_has_iordy(dev->id))
4633 else /* In the ancient relic department - skip all of this */
4636 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4638 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4642 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4643 * @dev: Device to which command will be sent
4644 * @enable: Whether to enable or disable the feature
4645 * @feature: The sector count represents the feature to set
4647 * Issue SET FEATURES - SATA FEATURES command to device @dev
4648 * on port @ap with sector count
4651 * PCI/etc. bus probe sem.
4654 * 0 on success, AC_ERR_* mask otherwise.
4656 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4659 struct ata_taskfile tf;
4660 unsigned int err_mask;
4662 /* set up set-features taskfile */
4663 DPRINTK("set features - SATA features\n");
4665 ata_tf_init(dev, &tf);
4666 tf.command = ATA_CMD_SET_FEATURES;
4667 tf.feature = enable;
4668 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4669 tf.protocol = ATA_PROT_NODATA;
4672 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4674 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4679 * ata_dev_init_params - Issue INIT DEV PARAMS command
4680 * @dev: Device to which command will be sent
4681 * @heads: Number of heads (taskfile parameter)
4682 * @sectors: Number of sectors (taskfile parameter)
4685 * Kernel thread context (may sleep)
4688 * 0 on success, AC_ERR_* mask otherwise.
4690 static unsigned int ata_dev_init_params(struct ata_device *dev,
4691 u16 heads, u16 sectors)
4693 struct ata_taskfile tf;
4694 unsigned int err_mask;
4696 /* Number of sectors per track 1-255. Number of heads 1-16 */
4697 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4698 return AC_ERR_INVALID;
4700 /* set up init dev params taskfile */
4701 DPRINTK("init dev params \n");
4703 ata_tf_init(dev, &tf);
4704 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4705 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4706 tf.protocol = ATA_PROT_NODATA;
4708 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4710 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4711 /* A clean abort indicates an original or just out of spec drive
4712 and we should continue as we issue the setup based on the
4713 drive reported working geometry */
4714 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4717 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4722 * ata_sg_clean - Unmap DMA memory associated with command
4723 * @qc: Command containing DMA memory to be released
4725 * Unmap all mapped DMA memory associated with this command.
4728 * spin_lock_irqsave(host lock)
4730 void ata_sg_clean(struct ata_queued_cmd *qc)
4732 struct ata_port *ap = qc->ap;
4733 struct scatterlist *sg = qc->sg;
4734 int dir = qc->dma_dir;
4736 WARN_ON_ONCE(sg == NULL);
4738 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4741 dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
4743 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4748 * atapi_check_dma - Check whether ATAPI DMA can be supported
4749 * @qc: Metadata associated with taskfile to check
4751 * Allow low-level driver to filter ATA PACKET commands, returning
4752 * a status indicating whether or not it is OK to use DMA for the
4753 * supplied PACKET command.
4756 * spin_lock_irqsave(host lock)
4758 * RETURNS: 0 when ATAPI DMA can be used
4761 int atapi_check_dma(struct ata_queued_cmd *qc)
4763 struct ata_port *ap = qc->ap;
4765 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4766 * few ATAPI devices choke on such DMA requests.
4768 if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4769 unlikely(qc->nbytes & 15))
4772 if (ap->ops->check_atapi_dma)
4773 return ap->ops->check_atapi_dma(qc);
4779 * ata_std_qc_defer - Check whether a qc needs to be deferred
4780 * @qc: ATA command in question
4782 * Non-NCQ commands cannot run with any other command, NCQ or
4783 * not. As upper layer only knows the queue depth, we are
4784 * responsible for maintaining exclusion. This function checks
4785 * whether a new command @qc can be issued.
4788 * spin_lock_irqsave(host lock)
4791 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4793 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4795 struct ata_link *link = qc->dev->link;
4797 if (qc->tf.protocol == ATA_PROT_NCQ) {
4798 if (!ata_tag_valid(link->active_tag))
4801 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4805 return ATA_DEFER_LINK;
4808 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4811 * ata_sg_init - Associate command with scatter-gather table.
4812 * @qc: Command to be associated
4813 * @sg: Scatter-gather table.
4814 * @n_elem: Number of elements in s/g table.
4816 * Initialize the data-related elements of queued_cmd @qc
4817 * to point to a scatter-gather table @sg, containing @n_elem
4821 * spin_lock_irqsave(host lock)
4823 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4824 unsigned int n_elem)
4827 qc->n_elem = n_elem;
4832 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4833 * @qc: Command with scatter-gather table to be mapped.
4835 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4838 * spin_lock_irqsave(host lock)
4841 * Zero on success, negative on error.
4844 static int ata_sg_setup(struct ata_queued_cmd *qc)
4846 struct ata_port *ap = qc->ap;
4847 unsigned int n_elem;
4849 VPRINTK("ENTER, ata%u\n", ap->print_id);
4851 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4855 DPRINTK("%d sg elements mapped\n", n_elem);
4856 qc->orig_n_elem = qc->n_elem;
4857 qc->n_elem = n_elem;
4858 qc->flags |= ATA_QCFLAG_DMAMAP;
4864 * swap_buf_le16 - swap halves of 16-bit words in place
4865 * @buf: Buffer to swap
4866 * @buf_words: Number of 16-bit words in buffer.
4868 * Swap halves of 16-bit words if needed to convert from
4869 * little-endian byte order to native cpu byte order, or
4873 * Inherited from caller.
4875 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4880 for (i = 0; i < buf_words; i++)
4881 buf[i] = le16_to_cpu(buf[i]);
4882 #endif /* __BIG_ENDIAN */
4886 * ata_qc_new - Request an available ATA command, for queueing
4893 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4895 struct ata_queued_cmd *qc = NULL;
4898 /* no command while frozen */
4899 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4902 /* the last tag is reserved for internal command. */
4903 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4904 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4905 qc = __ata_qc_from_tag(ap, i);
4916 * ata_qc_new_init - Request an available ATA command, and initialize it
4917 * @dev: Device from whom we request an available command structure
4923 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4925 struct ata_port *ap = dev->link->ap;
4926 struct ata_queued_cmd *qc;
4928 qc = ata_qc_new(ap);
4941 * ata_qc_free - free unused ata_queued_cmd
4942 * @qc: Command to complete
4944 * Designed to free unused ata_queued_cmd object
4945 * in case something prevents using it.
4948 * spin_lock_irqsave(host lock)
4950 void ata_qc_free(struct ata_queued_cmd *qc)
4952 struct ata_port *ap;
4955 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4960 if (likely(ata_tag_valid(tag))) {
4961 qc->tag = ATA_TAG_POISON;
4962 clear_bit(tag, &ap->qc_allocated);
4966 void __ata_qc_complete(struct ata_queued_cmd *qc)
4968 struct ata_port *ap;
4969 struct ata_link *link;
4971 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4972 WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4974 link = qc->dev->link;
4976 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4979 /* command should be marked inactive atomically with qc completion */
4980 if (qc->tf.protocol == ATA_PROT_NCQ) {
4981 link->sactive &= ~(1 << qc->tag);
4983 ap->nr_active_links--;
4985 link->active_tag = ATA_TAG_POISON;
4986 ap->nr_active_links--;
4989 /* clear exclusive status */
4990 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4991 ap->excl_link == link))
4992 ap->excl_link = NULL;
4994 /* atapi: mark qc as inactive to prevent the interrupt handler
4995 * from completing the command twice later, before the error handler
4996 * is called. (when rc != 0 and atapi request sense is needed)
4998 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4999 ap->qc_active &= ~(1 << qc->tag);
5001 /* call completion callback */
5002 qc->complete_fn(qc);
5005 static void fill_result_tf(struct ata_queued_cmd *qc)
5007 struct ata_port *ap = qc->ap;
5009 qc->result_tf.flags = qc->tf.flags;
5010 ap->ops->qc_fill_rtf(qc);
5013 static void ata_verify_xfer(struct ata_queued_cmd *qc)
5015 struct ata_device *dev = qc->dev;
5017 if (ata_tag_internal(qc->tag))
5020 if (ata_is_nodata(qc->tf.protocol))
5023 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
5026 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
5030 * ata_qc_complete - Complete an active ATA command
5031 * @qc: Command to complete
5033 * Indicate to the mid and upper layers that an ATA
5034 * command has completed, with either an ok or not-ok status.
5037 * spin_lock_irqsave(host lock)
5039 void ata_qc_complete(struct ata_queued_cmd *qc)
5041 struct ata_port *ap = qc->ap;
5043 /* XXX: New EH and old EH use different mechanisms to
5044 * synchronize EH with regular execution path.
5046 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5047 * Normal execution path is responsible for not accessing a
5048 * failed qc. libata core enforces the rule by returning NULL
5049 * from ata_qc_from_tag() for failed qcs.
5051 * Old EH depends on ata_qc_complete() nullifying completion
5052 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5053 * not synchronize with interrupt handler. Only PIO task is
5056 if (ap->ops->error_handler) {
5057 struct ata_device *dev = qc->dev;
5058 struct ata_eh_info *ehi = &dev->link->eh_info;
5060 if (unlikely(qc->err_mask))
5061 qc->flags |= ATA_QCFLAG_FAILED;
5063 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5064 /* always fill result TF for failed qc */
5067 if (!ata_tag_internal(qc->tag))
5068 ata_qc_schedule_eh(qc);
5070 __ata_qc_complete(qc);
5074 WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5076 /* read result TF if requested */
5077 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5080 /* Some commands need post-processing after successful
5083 switch (qc->tf.command) {
5084 case ATA_CMD_SET_FEATURES:
5085 if (qc->tf.feature != SETFEATURES_WC_ON &&
5086 qc->tf.feature != SETFEATURES_WC_OFF)
5089 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5090 case ATA_CMD_SET_MULTI: /* multi_count changed */
5091 /* revalidate device */
5092 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5093 ata_port_schedule_eh(ap);
5097 dev->flags |= ATA_DFLAG_SLEEPING;
5101 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5102 ata_verify_xfer(qc);
5104 __ata_qc_complete(qc);
5106 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5109 /* read result TF if failed or requested */
5110 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5113 __ata_qc_complete(qc);
5118 * ata_qc_complete_multiple - Complete multiple qcs successfully
5119 * @ap: port in question
5120 * @qc_active: new qc_active mask
5122 * Complete in-flight commands. This functions is meant to be
5123 * called from low-level driver's interrupt routine to complete
5124 * requests normally. ap->qc_active and @qc_active is compared
5125 * and commands are completed accordingly.
5128 * spin_lock_irqsave(host lock)
5131 * Number of completed commands on success, -errno otherwise.
5133 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
5138 done_mask = ap->qc_active ^ qc_active;
5140 if (unlikely(done_mask & qc_active)) {
5141 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5142 "(%08x->%08x)\n", ap->qc_active, qc_active);
5147 struct ata_queued_cmd *qc;
5148 unsigned int tag = __ffs(done_mask);
5150 qc = ata_qc_from_tag(ap, tag);
5152 ata_qc_complete(qc);
5155 done_mask &= ~(1 << tag);
5162 * ata_qc_issue - issue taskfile to device
5163 * @qc: command to issue to device
5165 * Prepare an ATA command to submission to device.
5166 * This includes mapping the data into a DMA-able
5167 * area, filling in the S/G table, and finally
5168 * writing the taskfile to hardware, starting the command.
5171 * spin_lock_irqsave(host lock)
5173 void ata_qc_issue(struct ata_queued_cmd *qc)
5175 struct ata_port *ap = qc->ap;
5176 struct ata_link *link = qc->dev->link;
5177 u8 prot = qc->tf.protocol;
5179 /* Make sure only one non-NCQ command is outstanding. The
5180 * check is skipped for old EH because it reuses active qc to
5181 * request ATAPI sense.
5183 WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5185 if (ata_is_ncq(prot)) {
5186 WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5189 ap->nr_active_links++;
5190 link->sactive |= 1 << qc->tag;
5192 WARN_ON_ONCE(link->sactive);
5194 ap->nr_active_links++;
5195 link->active_tag = qc->tag;
5198 qc->flags |= ATA_QCFLAG_ACTIVE;
5199 ap->qc_active |= 1 << qc->tag;
5201 /* We guarantee to LLDs that they will have at least one
5202 * non-zero sg if the command is a data command.
5204 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5206 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5207 (ap->flags & ATA_FLAG_PIO_DMA)))
5208 if (ata_sg_setup(qc))
5211 /* if device is sleeping, schedule reset and abort the link */
5212 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5213 link->eh_info.action |= ATA_EH_RESET;
5214 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5215 ata_link_abort(link);
5219 ap->ops->qc_prep(qc);
5221 qc->err_mask |= ap->ops->qc_issue(qc);
5222 if (unlikely(qc->err_mask))
5227 qc->err_mask |= AC_ERR_SYSTEM;
5229 ata_qc_complete(qc);
5233 * sata_scr_valid - test whether SCRs are accessible
5234 * @link: ATA link to test SCR accessibility for
5236 * Test whether SCRs are accessible for @link.
5242 * 1 if SCRs are accessible, 0 otherwise.
5244 int sata_scr_valid(struct ata_link *link)
5246 struct ata_port *ap = link->ap;
5248 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5252 * sata_scr_read - read SCR register of the specified port
5253 * @link: ATA link to read SCR for
5255 * @val: Place to store read value
5257 * Read SCR register @reg of @link into *@val. This function is
5258 * guaranteed to succeed if @link is ap->link, the cable type of
5259 * the port is SATA and the port implements ->scr_read.
5262 * None if @link is ap->link. Kernel thread context otherwise.
5265 * 0 on success, negative errno on failure.
5267 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5269 if (ata_is_host_link(link)) {
5270 if (sata_scr_valid(link))
5271 return link->ap->ops->scr_read(link, reg, val);
5275 return sata_pmp_scr_read(link, reg, val);
5279 * sata_scr_write - write SCR register of the specified port
5280 * @link: ATA link to write SCR for
5281 * @reg: SCR to write
5282 * @val: value to write
5284 * Write @val to SCR register @reg of @link. This function is
5285 * guaranteed to succeed if @link is ap->link, the cable type of
5286 * the port is SATA and the port implements ->scr_read.
5289 * None if @link is ap->link. Kernel thread context otherwise.
5292 * 0 on success, negative errno on failure.
5294 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5296 if (ata_is_host_link(link)) {
5297 if (sata_scr_valid(link))
5298 return link->ap->ops->scr_write(link, reg, val);
5302 return sata_pmp_scr_write(link, reg, val);
5306 * sata_scr_write_flush - write SCR register of the specified port and flush
5307 * @link: ATA link to write SCR for
5308 * @reg: SCR to write
5309 * @val: value to write
5311 * This function is identical to sata_scr_write() except that this
5312 * function performs flush after writing to the register.
5315 * None if @link is ap->link. Kernel thread context otherwise.
5318 * 0 on success, negative errno on failure.
5320 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5322 if (ata_is_host_link(link)) {
5325 if (sata_scr_valid(link)) {
5326 rc = link->ap->ops->scr_write(link, reg, val);
5328 rc = link->ap->ops->scr_read(link, reg, &val);
5334 return sata_pmp_scr_write(link, reg, val);
5338 * ata_phys_link_online - test whether the given link is online
5339 * @link: ATA link to test
5341 * Test whether @link is online. Note that this function returns
5342 * 0 if online status of @link cannot be obtained, so
5343 * ata_link_online(link) != !ata_link_offline(link).
5349 * True if the port online status is available and online.
5351 bool ata_phys_link_online(struct ata_link *link)
5355 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5356 ata_sstatus_online(sstatus))
5362 * ata_phys_link_offline - test whether the given link is offline
5363 * @link: ATA link to test
5365 * Test whether @link is offline. Note that this function
5366 * returns 0 if offline status of @link cannot be obtained, so
5367 * ata_link_online(link) != !ata_link_offline(link).
5373 * True if the port offline status is available and offline.
5375 bool ata_phys_link_offline(struct ata_link *link)
5379 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5380 !ata_sstatus_online(sstatus))
5386 * ata_link_online - test whether the given link is online
5387 * @link: ATA link to test
5389 * Test whether @link is online. This is identical to
5390 * ata_phys_link_online() when there's no slave link. When
5391 * there's a slave link, this function should only be called on
5392 * the master link and will return true if any of M/S links is
5399 * True if the port online status is available and online.
5401 bool ata_link_online(struct ata_link *link)
5403 struct ata_link *slave = link->ap->slave_link;
5405 WARN_ON(link == slave); /* shouldn't be called on slave link */
5407 return ata_phys_link_online(link) ||
5408 (slave && ata_phys_link_online(slave));
5412 * ata_link_offline - test whether the given link is offline
5413 * @link: ATA link to test
5415 * Test whether @link is offline. This is identical to
5416 * ata_phys_link_offline() when there's no slave link. When
5417 * there's a slave link, this function should only be called on
5418 * the master link and will return true if both M/S links are
5425 * True if the port offline status is available and offline.
5427 bool ata_link_offline(struct ata_link *link)
5429 struct ata_link *slave = link->ap->slave_link;
5431 WARN_ON(link == slave); /* shouldn't be called on slave link */
5433 return ata_phys_link_offline(link) &&
5434 (!slave || ata_phys_link_offline(slave));
5438 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5439 unsigned int action, unsigned int ehi_flags,
5442 unsigned long flags;
5445 for (i = 0; i < host->n_ports; i++) {
5446 struct ata_port *ap = host->ports[i];
5447 struct ata_link *link;
5449 /* Previous resume operation might still be in
5450 * progress. Wait for PM_PENDING to clear.
5452 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5453 ata_port_wait_eh(ap);
5454 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5457 /* request PM ops to EH */
5458 spin_lock_irqsave(ap->lock, flags);
5463 ap->pm_result = &rc;
5466 ap->pflags |= ATA_PFLAG_PM_PENDING;
5467 ata_for_each_link(link, ap, HOST_FIRST) {
5468 link->eh_info.action |= action;
5469 link->eh_info.flags |= ehi_flags;
5472 ata_port_schedule_eh(ap);
5474 spin_unlock_irqrestore(ap->lock, flags);
5476 /* wait and check result */
5478 ata_port_wait_eh(ap);
5479 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5489 * ata_host_suspend - suspend host
5490 * @host: host to suspend
5493 * Suspend @host. Actual operation is performed by EH. This
5494 * function requests EH to perform PM operations and waits for EH
5498 * Kernel thread context (may sleep).
5501 * 0 on success, -errno on failure.
5503 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5508 * disable link pm on all ports before requesting
5511 ata_lpm_enable(host);
5513 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5515 host->dev->power.power_state = mesg;
5520 * ata_host_resume - resume host
5521 * @host: host to resume
5523 * Resume @host. Actual operation is performed by EH. This
5524 * function requests EH to perform PM operations and returns.
5525 * Note that all resume operations are performed parallely.
5528 * Kernel thread context (may sleep).
5530 void ata_host_resume(struct ata_host *host)
5532 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
5533 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5534 host->dev->power.power_state = PMSG_ON;
5536 /* reenable link pm */
5537 ata_lpm_disable(host);
5542 * ata_port_start - Set port up for dma.
5543 * @ap: Port to initialize
5545 * Called just after data structures for each port are
5546 * initialized. Allocates space for PRD table.
5548 * May be used as the port_start() entry in ata_port_operations.
5551 * Inherited from caller.
5553 int ata_port_start(struct ata_port *ap)
5555 struct device *dev = ap->dev;
5557 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5566 * ata_dev_init - Initialize an ata_device structure
5567 * @dev: Device structure to initialize
5569 * Initialize @dev in preparation for probing.
5572 * Inherited from caller.
5574 void ata_dev_init(struct ata_device *dev)
5576 struct ata_link *link = ata_dev_phys_link(dev);
5577 struct ata_port *ap = link->ap;
5578 unsigned long flags;
5580 /* SATA spd limit is bound to the attached device, reset together */
5581 link->sata_spd_limit = link->hw_sata_spd_limit;
5584 /* High bits of dev->flags are used to record warm plug
5585 * requests which occur asynchronously. Synchronize using
5588 spin_lock_irqsave(ap->lock, flags);
5589 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5591 spin_unlock_irqrestore(ap->lock, flags);
5593 memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5594 ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5595 dev->pio_mask = UINT_MAX;
5596 dev->mwdma_mask = UINT_MAX;
5597 dev->udma_mask = UINT_MAX;
5601 * ata_link_init - Initialize an ata_link structure
5602 * @ap: ATA port link is attached to
5603 * @link: Link structure to initialize
5604 * @pmp: Port multiplier port number
5609 * Kernel thread context (may sleep)
5611 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5615 /* clear everything except for devices */
5616 memset(link, 0, offsetof(struct ata_link, device[0]));
5620 link->active_tag = ATA_TAG_POISON;
5621 link->hw_sata_spd_limit = UINT_MAX;
5623 /* can't use iterator, ap isn't initialized yet */
5624 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5625 struct ata_device *dev = &link->device[i];
5628 dev->devno = dev - link->device;
5629 #ifdef CONFIG_ATA_ACPI
5630 dev->gtf_filter = ata_acpi_gtf_filter;
5637 * sata_link_init_spd - Initialize link->sata_spd_limit
5638 * @link: Link to configure sata_spd_limit for
5640 * Initialize @link->[hw_]sata_spd_limit to the currently
5644 * Kernel thread context (may sleep).
5647 * 0 on success, -errno on failure.
5649 int sata_link_init_spd(struct ata_link *link)
5654 rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5658 spd = (link->saved_scontrol >> 4) & 0xf;
5660 link->hw_sata_spd_limit &= (1 << spd) - 1;
5662 ata_force_link_limits(link);
5664 link->sata_spd_limit = link->hw_sata_spd_limit;
5670 * ata_port_alloc - allocate and initialize basic ATA port resources
5671 * @host: ATA host this allocated port belongs to
5673 * Allocate and initialize basic ATA port resources.
5676 * Allocate ATA port on success, NULL on failure.
5679 * Inherited from calling layer (may sleep).
5681 struct ata_port *ata_port_alloc(struct ata_host *host)
5683 struct ata_port *ap;
5687 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5691 ap->pflags |= ATA_PFLAG_INITIALIZING;
5692 ap->lock = &host->lock;
5693 ap->flags = ATA_FLAG_DISABLED;
5695 ap->ctl = ATA_DEVCTL_OBS;
5697 ap->dev = host->dev;
5698 ap->last_ctl = 0xFF;
5700 #if defined(ATA_VERBOSE_DEBUG)
5701 /* turn on all debugging levels */
5702 ap->msg_enable = 0x00FF;
5703 #elif defined(ATA_DEBUG)
5704 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5706 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5709 #ifdef CONFIG_ATA_SFF
5710 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5712 INIT_DELAYED_WORK(&ap->port_task, NULL);
5714 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5715 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5716 INIT_LIST_HEAD(&ap->eh_done_q);
5717 init_waitqueue_head(&ap->eh_wait_q);
5718 init_completion(&ap->park_req_pending);
5719 init_timer_deferrable(&ap->fastdrain_timer);
5720 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5721 ap->fastdrain_timer.data = (unsigned long)ap;
5723 ap->cbl = ATA_CBL_NONE;
5725 ata_link_init(ap, &ap->link, 0);
5728 ap->stats.unhandled_irq = 1;
5729 ap->stats.idle_irq = 1;
5734 static void ata_host_release(struct device *gendev, void *res)
5736 struct ata_host *host = dev_get_drvdata(gendev);
5739 for (i = 0; i < host->n_ports; i++) {
5740 struct ata_port *ap = host->ports[i];
5746 scsi_host_put(ap->scsi_host);
5748 kfree(ap->pmp_link);
5749 kfree(ap->slave_link);
5751 host->ports[i] = NULL;
5754 dev_set_drvdata(gendev, NULL);
5758 * ata_host_alloc - allocate and init basic ATA host resources
5759 * @dev: generic device this host is associated with
5760 * @max_ports: maximum number of ATA ports associated with this host
5762 * Allocate and initialize basic ATA host resources. LLD calls
5763 * this function to allocate a host, initializes it fully and
5764 * attaches it using ata_host_register().
5766 * @max_ports ports are allocated and host->n_ports is
5767 * initialized to @max_ports. The caller is allowed to decrease
5768 * host->n_ports before calling ata_host_register(). The unused
5769 * ports will be automatically freed on registration.
5772 * Allocate ATA host on success, NULL on failure.
5775 * Inherited from calling layer (may sleep).
5777 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5779 struct ata_host *host;
5785 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5788 /* alloc a container for our list of ATA ports (buses) */
5789 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5790 /* alloc a container for our list of ATA ports (buses) */
5791 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5795 devres_add(dev, host);
5796 dev_set_drvdata(dev, host);
5798 spin_lock_init(&host->lock);
5800 host->n_ports = max_ports;
5802 /* allocate ports bound to this host */
5803 for (i = 0; i < max_ports; i++) {
5804 struct ata_port *ap;
5806 ap = ata_port_alloc(host);
5811 host->ports[i] = ap;
5814 devres_remove_group(dev, NULL);
5818 devres_release_group(dev, NULL);
5823 * ata_host_alloc_pinfo - alloc host and init with port_info array
5824 * @dev: generic device this host is associated with
5825 * @ppi: array of ATA port_info to initialize host with
5826 * @n_ports: number of ATA ports attached to this host
5828 * Allocate ATA host and initialize with info from @ppi. If NULL
5829 * terminated, @ppi may contain fewer entries than @n_ports. The
5830 * last entry will be used for the remaining ports.
5833 * Allocate ATA host on success, NULL on failure.
5836 * Inherited from calling layer (may sleep).
5838 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5839 const struct ata_port_info * const * ppi,
5842 const struct ata_port_info *pi;
5843 struct ata_host *host;
5846 host = ata_host_alloc(dev, n_ports);
5850 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5851 struct ata_port *ap = host->ports[i];
5856 ap->pio_mask = pi->pio_mask;
5857 ap->mwdma_mask = pi->mwdma_mask;
5858 ap->udma_mask = pi->udma_mask;
5859 ap->flags |= pi->flags;
5860 ap->link.flags |= pi->link_flags;
5861 ap->ops = pi->port_ops;
5863 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5864 host->ops = pi->port_ops;
5871 * ata_slave_link_init - initialize slave link
5872 * @ap: port to initialize slave link for
5874 * Create and initialize slave link for @ap. This enables slave
5875 * link handling on the port.
5877 * In libata, a port contains links and a link contains devices.
5878 * There is single host link but if a PMP is attached to it,
5879 * there can be multiple fan-out links. On SATA, there's usually
5880 * a single device connected to a link but PATA and SATA
5881 * controllers emulating TF based interface can have two - master
5884 * However, there are a few controllers which don't fit into this
5885 * abstraction too well - SATA controllers which emulate TF
5886 * interface with both master and slave devices but also have
5887 * separate SCR register sets for each device. These controllers
5888 * need separate links for physical link handling
5889 * (e.g. onlineness, link speed) but should be treated like a
5890 * traditional M/S controller for everything else (e.g. command
5891 * issue, softreset).
5893 * slave_link is libata's way of handling this class of
5894 * controllers without impacting core layer too much. For
5895 * anything other than physical link handling, the default host
5896 * link is used for both master and slave. For physical link
5897 * handling, separate @ap->slave_link is used. All dirty details
5898 * are implemented inside libata core layer. From LLD's POV, the
5899 * only difference is that prereset, hardreset and postreset are
5900 * called once more for the slave link, so the reset sequence
5901 * looks like the following.
5903 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
5904 * softreset(M) -> postreset(M) -> postreset(S)
5906 * Note that softreset is called only for the master. Softreset
5907 * resets both M/S by definition, so SRST on master should handle
5908 * both (the standard method will work just fine).
5911 * Should be called before host is registered.
5914 * 0 on success, -errno on failure.
5916 int ata_slave_link_init(struct ata_port *ap)
5918 struct ata_link *link;
5920 WARN_ON(ap->slave_link);
5921 WARN_ON(ap->flags & ATA_FLAG_PMP);
5923 link = kzalloc(sizeof(*link), GFP_KERNEL);
5927 ata_link_init(ap, link, 1);
5928 ap->slave_link = link;
5932 static void ata_host_stop(struct device *gendev, void *res)
5934 struct ata_host *host = dev_get_drvdata(gendev);
5937 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5939 for (i = 0; i < host->n_ports; i++) {
5940 struct ata_port *ap = host->ports[i];
5942 if (ap->ops->port_stop)
5943 ap->ops->port_stop(ap);
5946 if (host->ops->host_stop)
5947 host->ops->host_stop(host);
5951 * ata_finalize_port_ops - finalize ata_port_operations
5952 * @ops: ata_port_operations to finalize
5954 * An ata_port_operations can inherit from another ops and that
5955 * ops can again inherit from another. This can go on as many
5956 * times as necessary as long as there is no loop in the
5957 * inheritance chain.
5959 * Ops tables are finalized when the host is started. NULL or
5960 * unspecified entries are inherited from the closet ancestor
5961 * which has the method and the entry is populated with it.
5962 * After finalization, the ops table directly points to all the
5963 * methods and ->inherits is no longer necessary and cleared.
5965 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5970 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5972 static DEFINE_SPINLOCK(lock);
5973 const struct ata_port_operations *cur;
5974 void **begin = (void **)ops;
5975 void **end = (void **)&ops->inherits;
5978 if (!ops || !ops->inherits)
5983 for (cur = ops->inherits; cur; cur = cur->inherits) {
5984 void **inherit = (void **)cur;
5986 for (pp = begin; pp < end; pp++, inherit++)
5991 for (pp = begin; pp < end; pp++)
5995 ops->inherits = NULL;
6001 * ata_host_start - start and freeze ports of an ATA host
6002 * @host: ATA host to start ports for
6004 * Start and then freeze ports of @host. Started status is
6005 * recorded in host->flags, so this function can be called
6006 * multiple times. Ports are guaranteed to get started only
6007 * once. If host->ops isn't initialized yet, its set to the
6008 * first non-dummy port ops.
6011 * Inherited from calling layer (may sleep).
6014 * 0 if all ports are started successfully, -errno otherwise.
6016 int ata_host_start(struct ata_host *host)
6019 void *start_dr = NULL;
6022 if (host->flags & ATA_HOST_STARTED)
6025 ata_finalize_port_ops(host->ops);
6027 for (i = 0; i < host->n_ports; i++) {
6028 struct ata_port *ap = host->ports[i];
6030 ata_finalize_port_ops(ap->ops);
6032 if (!host->ops && !ata_port_is_dummy(ap))
6033 host->ops = ap->ops;
6035 if (ap->ops->port_stop)
6039 if (host->ops->host_stop)
6043 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6048 for (i = 0; i < host->n_ports; i++) {
6049 struct ata_port *ap = host->ports[i];
6051 if (ap->ops->port_start) {
6052 rc = ap->ops->port_start(ap);
6055 dev_printk(KERN_ERR, host->dev,
6056 "failed to start port %d "
6057 "(errno=%d)\n", i, rc);
6061 ata_eh_freeze_port(ap);
6065 devres_add(host->dev, start_dr);
6066 host->flags |= ATA_HOST_STARTED;
6071 struct ata_port *ap = host->ports[i];
6073 if (ap->ops->port_stop)
6074 ap->ops->port_stop(ap);
6076 devres_free(start_dr);
6081 * ata_sas_host_init - Initialize a host struct
6082 * @host: host to initialize
6083 * @dev: device host is attached to
6084 * @flags: host flags
6088 * PCI/etc. bus probe sem.
6091 /* KILLME - the only user left is ipr */
6092 void ata_host_init(struct ata_host *host, struct device *dev,
6093 unsigned long flags, struct ata_port_operations *ops)
6095 spin_lock_init(&host->lock);
6097 host->flags = flags;
6102 static void async_port_probe(void *data, async_cookie_t cookie)
6105 struct ata_port *ap = data;
6108 * If we're not allowed to scan this host in parallel,
6109 * we need to wait until all previous scans have completed
6110 * before going further.
6111 * Jeff Garzik says this is only within a controller, so we
6112 * don't need to wait for port 0, only for later ports.
6114 if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6115 async_synchronize_cookie(cookie);
6118 if (ap->ops->error_handler) {
6119 struct ata_eh_info *ehi = &ap->link.eh_info;
6120 unsigned long flags;
6124 /* kick EH for boot probing */
6125 spin_lock_irqsave(ap->lock, flags);
6127 ehi->probe_mask |= ATA_ALL_DEVICES;
6128 ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
6129 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6131 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6132 ap->pflags |= ATA_PFLAG_LOADING;
6133 ata_port_schedule_eh(ap);
6135 spin_unlock_irqrestore(ap->lock, flags);
6137 /* wait for EH to finish */
6138 ata_port_wait_eh(ap);
6140 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6141 rc = ata_bus_probe(ap);
6142 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6145 /* FIXME: do something useful here?
6146 * Current libata behavior will
6147 * tear down everything when
6148 * the module is removed
6149 * or the h/w is unplugged.
6154 /* in order to keep device order, we need to synchronize at this point */
6155 async_synchronize_cookie(cookie);
6157 ata_scsi_scan_host(ap, 1);
6161 * ata_host_register - register initialized ATA host
6162 * @host: ATA host to register
6163 * @sht: template for SCSI host
6165 * Register initialized ATA host. @host is allocated using
6166 * ata_host_alloc() and fully initialized by LLD. This function
6167 * starts ports, registers @host with ATA and SCSI layers and
6168 * probe registered devices.
6171 * Inherited from calling layer (may sleep).
6174 * 0 on success, -errno otherwise.
6176 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6180 /* host must have been started */
6181 if (!(host->flags & ATA_HOST_STARTED)) {
6182 dev_printk(KERN_ERR, host->dev,
6183 "BUG: trying to register unstarted host\n");
6188 /* Blow away unused ports. This happens when LLD can't
6189 * determine the exact number of ports to allocate at
6192 for (i = host->n_ports; host->ports[i]; i++)
6193 kfree(host->ports[i]);
6195 /* give ports names and add SCSI hosts */
6196 for (i = 0; i < host->n_ports; i++)
6197 host->ports[i]->print_id = ata_print_id++;
6199 rc = ata_scsi_add_hosts(host, sht);
6203 /* associate with ACPI nodes */
6204 ata_acpi_associate(host);
6206 /* set cable, sata_spd_limit and report */
6207 for (i = 0; i < host->n_ports; i++) {
6208 struct ata_port *ap = host->ports[i];
6209 unsigned long xfer_mask;
6211 /* set SATA cable type if still unset */
6212 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6213 ap->cbl = ATA_CBL_SATA;
6215 /* init sata_spd_limit to the current value */
6216 sata_link_init_spd(&ap->link);
6218 sata_link_init_spd(ap->slave_link);
6220 /* print per-port info to dmesg */
6221 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6224 if (!ata_port_is_dummy(ap)) {
6225 ata_port_printk(ap, KERN_INFO,
6226 "%cATA max %s %s\n",
6227 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6228 ata_mode_string(xfer_mask),
6229 ap->link.eh_info.desc);
6230 ata_ehi_clear_desc(&ap->link.eh_info);
6232 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
6235 /* perform each probe asynchronously */
6236 for (i = 0; i < host->n_ports; i++) {
6237 struct ata_port *ap = host->ports[i];
6238 async_schedule(async_port_probe, ap);
6245 * ata_host_activate - start host, request IRQ and register it
6246 * @host: target ATA host
6247 * @irq: IRQ to request
6248 * @irq_handler: irq_handler used when requesting IRQ
6249 * @irq_flags: irq_flags used when requesting IRQ
6250 * @sht: scsi_host_template to use when registering the host
6252 * After allocating an ATA host and initializing it, most libata
6253 * LLDs perform three steps to activate the host - start host,
6254 * request IRQ and register it. This helper takes necessasry
6255 * arguments and performs the three steps in one go.
6257 * An invalid IRQ skips the IRQ registration and expects the host to
6258 * have set polling mode on the port. In this case, @irq_handler
6262 * Inherited from calling layer (may sleep).
6265 * 0 on success, -errno otherwise.
6267 int ata_host_activate(struct ata_host *host, int irq,
6268 irq_handler_t irq_handler, unsigned long irq_flags,
6269 struct scsi_host_template *sht)
6273 rc = ata_host_start(host);
6277 /* Special case for polling mode */
6279 WARN_ON(irq_handler);
6280 return ata_host_register(host, sht);
6283 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6284 dev_driver_string(host->dev), host);
6288 for (i = 0; i < host->n_ports; i++)
6289 ata_port_desc(host->ports[i], "irq %d", irq);
6291 rc = ata_host_register(host, sht);
6292 /* if failed, just free the IRQ and leave ports alone */
6294 devm_free_irq(host->dev, irq, host);
6300 * ata_port_detach - Detach ATA port in prepration of device removal
6301 * @ap: ATA port to be detached
6303 * Detach all ATA devices and the associated SCSI devices of @ap;
6304 * then, remove the associated SCSI host. @ap is guaranteed to
6305 * be quiescent on return from this function.
6308 * Kernel thread context (may sleep).
6310 static void ata_port_detach(struct ata_port *ap)
6312 unsigned long flags;
6314 if (!ap->ops->error_handler)
6317 /* tell EH we're leaving & flush EH */
6318 spin_lock_irqsave(ap->lock, flags);
6319 ap->pflags |= ATA_PFLAG_UNLOADING;
6320 ata_port_schedule_eh(ap);
6321 spin_unlock_irqrestore(ap->lock, flags);
6323 /* wait till EH commits suicide */
6324 ata_port_wait_eh(ap);
6326 /* it better be dead now */
6327 WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6329 cancel_rearming_delayed_work(&ap->hotplug_task);
6332 /* remove the associated SCSI host */
6333 scsi_remove_host(ap->scsi_host);
6337 * ata_host_detach - Detach all ports of an ATA host
6338 * @host: Host to detach
6340 * Detach all ports of @host.
6343 * Kernel thread context (may sleep).
6345 void ata_host_detach(struct ata_host *host)
6349 for (i = 0; i < host->n_ports; i++)
6350 ata_port_detach(host->ports[i]);
6352 /* the host is dead now, dissociate ACPI */
6353 ata_acpi_dissociate(host);
6359 * ata_pci_remove_one - PCI layer callback for device removal
6360 * @pdev: PCI device that was removed
6362 * PCI layer indicates to libata via this hook that hot-unplug or
6363 * module unload event has occurred. Detach all ports. Resource
6364 * release is handled via devres.
6367 * Inherited from PCI layer (may sleep).
6369 void ata_pci_remove_one(struct pci_dev *pdev)
6371 struct device *dev = &pdev->dev;
6372 struct ata_host *host = dev_get_drvdata(dev);
6374 ata_host_detach(host);
6377 /* move to PCI subsystem */
6378 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6380 unsigned long tmp = 0;
6382 switch (bits->width) {
6385 pci_read_config_byte(pdev, bits->reg, &tmp8);
6391 pci_read_config_word(pdev, bits->reg, &tmp16);
6397 pci_read_config_dword(pdev, bits->reg, &tmp32);
6408 return (tmp == bits->val) ? 1 : 0;
6412 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6414 pci_save_state(pdev);
6415 pci_disable_device(pdev);
6417 if (mesg.event & PM_EVENT_SLEEP)
6418 pci_set_power_state(pdev, PCI_D3hot);
6421 int ata_pci_device_do_resume(struct pci_dev *pdev)
6425 pci_set_power_state(pdev, PCI_D0);
6426 pci_restore_state(pdev);
6428 rc = pcim_enable_device(pdev);
6430 dev_printk(KERN_ERR, &pdev->dev,
6431 "failed to enable device after resume (%d)\n", rc);
6435 pci_set_master(pdev);
6439 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6441 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6444 rc = ata_host_suspend(host, mesg);
6448 ata_pci_device_do_suspend(pdev, mesg);
6453 int ata_pci_device_resume(struct pci_dev *pdev)
6455 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6458 rc = ata_pci_device_do_resume(pdev);
6460 ata_host_resume(host);
6463 #endif /* CONFIG_PM */
6465 #endif /* CONFIG_PCI */
6467 static int __init ata_parse_force_one(char **cur,
6468 struct ata_force_ent *force_ent,
6469 const char **reason)
6471 /* FIXME: Currently, there's no way to tag init const data and
6472 * using __initdata causes build failure on some versions of
6473 * gcc. Once __initdataconst is implemented, add const to the
6474 * following structure.
6476 static struct ata_force_param force_tbl[] __initdata = {
6477 { "40c", .cbl = ATA_CBL_PATA40 },
6478 { "80c", .cbl = ATA_CBL_PATA80 },
6479 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
6480 { "unk", .cbl = ATA_CBL_PATA_UNK },
6481 { "ign", .cbl = ATA_CBL_PATA_IGN },
6482 { "sata", .cbl = ATA_CBL_SATA },
6483 { "1.5Gbps", .spd_limit = 1 },
6484 { "3.0Gbps", .spd_limit = 2 },
6485 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
6486 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
6487 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
6488 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
6489 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
6490 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
6491 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
6492 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
6493 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
6494 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
6495 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
6496 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
6497 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
6498 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
6499 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6500 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6501 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6502 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6503 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6504 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6505 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6506 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6507 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6508 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6509 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6510 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6511 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6512 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6513 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6514 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6515 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6516 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6517 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6518 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6519 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6520 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
6521 { "nohrst", .lflags = ATA_LFLAG_NO_HRST },
6522 { "nosrst", .lflags = ATA_LFLAG_NO_SRST },
6523 { "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6525 char *start = *cur, *p = *cur;
6526 char *id, *val, *endp;
6527 const struct ata_force_param *match_fp = NULL;
6528 int nr_matches = 0, i;
6530 /* find where this param ends and update *cur */
6531 while (*p != '\0' && *p != ',')
6542 p = strchr(start, ':');
6544 val = strstrip(start);
6549 id = strstrip(start);
6550 val = strstrip(p + 1);
6553 p = strchr(id, '.');
6556 force_ent->device = simple_strtoul(p, &endp, 10);
6557 if (p == endp || *endp != '\0') {
6558 *reason = "invalid device";
6563 force_ent->port = simple_strtoul(id, &endp, 10);
6564 if (p == endp || *endp != '\0') {
6565 *reason = "invalid port/link";
6570 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
6571 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
6572 const struct ata_force_param *fp = &force_tbl[i];
6574 if (strncasecmp(val, fp->name, strlen(val)))
6580 if (strcasecmp(val, fp->name) == 0) {
6587 *reason = "unknown value";
6590 if (nr_matches > 1) {
6591 *reason = "ambigious value";
6595 force_ent->param = *match_fp;
6600 static void __init ata_parse_force_param(void)
6602 int idx = 0, size = 1;
6603 int last_port = -1, last_device = -1;
6604 char *p, *cur, *next;
6606 /* calculate maximum number of params and allocate force_tbl */
6607 for (p = ata_force_param_buf; *p; p++)
6611 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
6612 if (!ata_force_tbl) {
6613 printk(KERN_WARNING "ata: failed to extend force table, "
6614 "libata.force ignored\n");
6618 /* parse and populate the table */
6619 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6620 const char *reason = "";
6621 struct ata_force_ent te = { .port = -1, .device = -1 };
6624 if (ata_parse_force_one(&next, &te, &reason)) {
6625 printk(KERN_WARNING "ata: failed to parse force "
6626 "parameter \"%s\" (%s)\n",
6631 if (te.port == -1) {
6632 te.port = last_port;
6633 te.device = last_device;
6636 ata_force_tbl[idx++] = te;
6638 last_port = te.port;
6639 last_device = te.device;
6642 ata_force_tbl_size = idx;
6645 static int __init ata_init(void)
6647 ata_parse_force_param();
6650 * FIXME: In UP case, there is only one workqueue thread and if you
6651 * have more than one PIO device, latency is bloody awful, with
6652 * occasional multi-second "hiccups" as one PIO device waits for
6653 * another. It's an ugly wart that users DO occasionally complain
6654 * about; luckily most users have at most one PIO polled device.
6656 ata_wq = create_workqueue("ata");
6658 goto free_force_tbl;
6660 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6664 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6668 destroy_workqueue(ata_wq);
6670 kfree(ata_force_tbl);
6674 static void __exit ata_exit(void)
6676 kfree(ata_force_tbl);
6677 destroy_workqueue(ata_wq);
6678 destroy_workqueue(ata_aux_wq);
6681 subsys_initcall(ata_init);
6682 module_exit(ata_exit);
6684 static unsigned long ratelimit_time;
6685 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6687 int ata_ratelimit(void)
6690 unsigned long flags;
6692 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6694 if (time_after(jiffies, ratelimit_time)) {
6696 ratelimit_time = jiffies + (HZ/5);
6700 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6706 * ata_wait_register - wait until register value changes
6707 * @reg: IO-mapped register
6708 * @mask: Mask to apply to read register value
6709 * @val: Wait condition
6710 * @interval: polling interval in milliseconds
6711 * @timeout: timeout in milliseconds
6713 * Waiting for some bits of register to change is a common
6714 * operation for ATA controllers. This function reads 32bit LE
6715 * IO-mapped register @reg and tests for the following condition.
6717 * (*@reg & mask) != val
6719 * If the condition is met, it returns; otherwise, the process is
6720 * repeated after @interval_msec until timeout.
6723 * Kernel thread context (may sleep)
6726 * The final register value.
6728 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6729 unsigned long interval, unsigned long timeout)
6731 unsigned long deadline;
6734 tmp = ioread32(reg);
6736 /* Calculate timeout _after_ the first read to make sure
6737 * preceding writes reach the controller before starting to
6738 * eat away the timeout.
6740 deadline = ata_deadline(jiffies, timeout);
6742 while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6744 tmp = ioread32(reg);
6753 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6755 return AC_ERR_SYSTEM;
6758 static void ata_dummy_error_handler(struct ata_port *ap)
6763 struct ata_port_operations ata_dummy_port_ops = {
6764 .qc_prep = ata_noop_qc_prep,
6765 .qc_issue = ata_dummy_qc_issue,
6766 .error_handler = ata_dummy_error_handler,
6769 const struct ata_port_info ata_dummy_port_info = {
6770 .port_ops = &ata_dummy_port_ops,
6774 * libata is essentially a library of internal helper functions for
6775 * low-level ATA host controller drivers. As such, the API/ABI is
6776 * likely to change as new drivers are added and updated.
6777 * Do not depend on ABI/API stability.
6779 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6780 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6781 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6782 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6783 EXPORT_SYMBOL_GPL(sata_port_ops);
6784 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6785 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6786 EXPORT_SYMBOL_GPL(ata_link_next);
6787 EXPORT_SYMBOL_GPL(ata_dev_next);
6788 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6789 EXPORT_SYMBOL_GPL(ata_host_init);
6790 EXPORT_SYMBOL_GPL(ata_host_alloc);
6791 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6792 EXPORT_SYMBOL_GPL(ata_slave_link_init);
6793 EXPORT_SYMBOL_GPL(ata_host_start);
6794 EXPORT_SYMBOL_GPL(ata_host_register);
6795 EXPORT_SYMBOL_GPL(ata_host_activate);
6796 EXPORT_SYMBOL_GPL(ata_host_detach);
6797 EXPORT_SYMBOL_GPL(ata_sg_init);
6798 EXPORT_SYMBOL_GPL(ata_qc_complete);
6799 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6800 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6801 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6802 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6803 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6804 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6805 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6806 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6807 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6808 EXPORT_SYMBOL_GPL(ata_mode_string);
6809 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6810 EXPORT_SYMBOL_GPL(ata_port_start);
6811 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6812 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6813 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6814 EXPORT_SYMBOL_GPL(ata_port_probe);
6815 EXPORT_SYMBOL_GPL(ata_dev_disable);
6816 EXPORT_SYMBOL_GPL(sata_set_spd);
6817 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6818 EXPORT_SYMBOL_GPL(sata_link_debounce);
6819 EXPORT_SYMBOL_GPL(sata_link_resume);
6820 EXPORT_SYMBOL_GPL(ata_std_prereset);
6821 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6822 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6823 EXPORT_SYMBOL_GPL(ata_std_postreset);
6824 EXPORT_SYMBOL_GPL(ata_dev_classify);
6825 EXPORT_SYMBOL_GPL(ata_dev_pair);
6826 EXPORT_SYMBOL_GPL(ata_port_disable);
6827 EXPORT_SYMBOL_GPL(ata_ratelimit);
6828 EXPORT_SYMBOL_GPL(ata_wait_register);
6829 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6830 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6831 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6832 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6833 EXPORT_SYMBOL_GPL(sata_scr_valid);
6834 EXPORT_SYMBOL_GPL(sata_scr_read);
6835 EXPORT_SYMBOL_GPL(sata_scr_write);
6836 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6837 EXPORT_SYMBOL_GPL(ata_link_online);
6838 EXPORT_SYMBOL_GPL(ata_link_offline);
6840 EXPORT_SYMBOL_GPL(ata_host_suspend);
6841 EXPORT_SYMBOL_GPL(ata_host_resume);
6842 #endif /* CONFIG_PM */
6843 EXPORT_SYMBOL_GPL(ata_id_string);
6844 EXPORT_SYMBOL_GPL(ata_id_c_string);
6845 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
6846 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6848 EXPORT_SYMBOL_GPL(ata_pio_queue_task);
6849 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6850 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6851 EXPORT_SYMBOL_GPL(ata_timing_compute);
6852 EXPORT_SYMBOL_GPL(ata_timing_merge);
6853 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6856 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6857 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6859 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6860 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6861 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6862 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6863 #endif /* CONFIG_PM */
6864 #endif /* CONFIG_PCI */
6866 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6867 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6868 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6869 EXPORT_SYMBOL_GPL(ata_port_desc);
6871 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6872 #endif /* CONFIG_PCI */
6873 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6874 EXPORT_SYMBOL_GPL(ata_link_abort);
6875 EXPORT_SYMBOL_GPL(ata_port_abort);
6876 EXPORT_SYMBOL_GPL(ata_port_freeze);
6877 EXPORT_SYMBOL_GPL(sata_async_notification);
6878 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6879 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6880 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6881 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6882 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
6883 EXPORT_SYMBOL_GPL(ata_do_eh);
6884 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6886 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6887 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6888 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6889 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6890 EXPORT_SYMBOL_GPL(ata_cable_sata);