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/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev);
65 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev);
66 static void ata_set_mode(struct ata_port *ap);
67 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
68 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
69 static int fgb(u32 bitmap);
70 static int ata_choose_xfer_mode(const struct ata_port *ap,
72 unsigned int *xfer_shift_out);
74 static unsigned int ata_unique_id = 1;
75 static struct workqueue_struct *ata_wq;
77 int atapi_enabled = 0;
78 module_param(atapi_enabled, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 MODULE_AUTHOR("Jeff Garzik");
82 MODULE_DESCRIPTION("Library module for ATA devices");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(DRV_VERSION);
88 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
97 * Inherited from caller.
100 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
102 fis[0] = 0x27; /* Register - Host to Device FIS */
103 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis[2] = tf->command;
106 fis[3] = tf->feature;
113 fis[8] = tf->hob_lbal;
114 fis[9] = tf->hob_lbam;
115 fis[10] = tf->hob_lbah;
116 fis[11] = tf->hob_feature;
119 fis[13] = tf->hob_nsect;
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
137 * Inherited from caller.
140 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
142 tf->command = fis[2]; /* status */
143 tf->feature = fis[3]; /* error */
150 tf->hob_lbal = fis[8];
151 tf->hob_lbam = fis[9];
152 tf->hob_lbah = fis[10];
155 tf->hob_nsect = fis[13];
158 static const u8 ata_rw_cmds[] = {
162 ATA_CMD_READ_MULTI_EXT,
163 ATA_CMD_WRITE_MULTI_EXT,
167 ATA_CMD_WRITE_MULTI_FUA_EXT,
171 ATA_CMD_PIO_READ_EXT,
172 ATA_CMD_PIO_WRITE_EXT,
185 ATA_CMD_WRITE_FUA_EXT
189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
198 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
200 struct ata_taskfile *tf = &qc->tf;
201 struct ata_device *dev = qc->dev;
204 int index, fua, lba48, write;
206 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
207 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
208 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
210 if (dev->flags & ATA_DFLAG_PIO) {
211 tf->protocol = ATA_PROT_PIO;
212 index = dev->multi_count ? 0 : 8;
213 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
214 /* Unable to use DMA due to host limitation */
215 tf->protocol = ATA_PROT_PIO;
216 index = dev->multi_count ? 0 : 4;
218 tf->protocol = ATA_PROT_DMA;
222 cmd = ata_rw_cmds[index + fua + lba48 + write];
230 static const char * const xfer_mode_str[] = {
250 * ata_udma_string - convert UDMA bit offset to string
251 * @mask: mask of bits supported; only highest bit counts.
253 * Determine string which represents the highest speed
254 * (highest bit in @udma_mask).
260 * Constant C string representing highest speed listed in
261 * @udma_mask, or the constant C string "<n/a>".
264 static const char *ata_mode_string(unsigned int mask)
268 for (i = 7; i >= 0; i--)
271 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
274 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
281 return xfer_mode_str[i];
285 * ata_pio_devchk - PATA device presence detection
286 * @ap: ATA channel to examine
287 * @device: Device to examine (starting at zero)
289 * This technique was originally described in
290 * Hale Landis's ATADRVR (www.ata-atapi.com), and
291 * later found its way into the ATA/ATAPI spec.
293 * Write a pattern to the ATA shadow registers,
294 * and if a device is present, it will respond by
295 * correctly storing and echoing back the
296 * ATA shadow register contents.
302 static unsigned int ata_pio_devchk(struct ata_port *ap,
305 struct ata_ioports *ioaddr = &ap->ioaddr;
308 ap->ops->dev_select(ap, device);
310 outb(0x55, ioaddr->nsect_addr);
311 outb(0xaa, ioaddr->lbal_addr);
313 outb(0xaa, ioaddr->nsect_addr);
314 outb(0x55, ioaddr->lbal_addr);
316 outb(0x55, ioaddr->nsect_addr);
317 outb(0xaa, ioaddr->lbal_addr);
319 nsect = inb(ioaddr->nsect_addr);
320 lbal = inb(ioaddr->lbal_addr);
322 if ((nsect == 0x55) && (lbal == 0xaa))
323 return 1; /* we found a device */
325 return 0; /* nothing found */
329 * ata_mmio_devchk - PATA device presence detection
330 * @ap: ATA channel to examine
331 * @device: Device to examine (starting at zero)
333 * This technique was originally described in
334 * Hale Landis's ATADRVR (www.ata-atapi.com), and
335 * later found its way into the ATA/ATAPI spec.
337 * Write a pattern to the ATA shadow registers,
338 * and if a device is present, it will respond by
339 * correctly storing and echoing back the
340 * ATA shadow register contents.
346 static unsigned int ata_mmio_devchk(struct ata_port *ap,
349 struct ata_ioports *ioaddr = &ap->ioaddr;
352 ap->ops->dev_select(ap, device);
354 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
355 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
357 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
358 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
360 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
361 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
363 nsect = readb((void __iomem *) ioaddr->nsect_addr);
364 lbal = readb((void __iomem *) ioaddr->lbal_addr);
366 if ((nsect == 0x55) && (lbal == 0xaa))
367 return 1; /* we found a device */
369 return 0; /* nothing found */
373 * ata_devchk - PATA device presence detection
374 * @ap: ATA channel to examine
375 * @device: Device to examine (starting at zero)
377 * Dispatch ATA device presence detection, depending
378 * on whether we are using PIO or MMIO to talk to the
379 * ATA shadow registers.
385 static unsigned int ata_devchk(struct ata_port *ap,
388 if (ap->flags & ATA_FLAG_MMIO)
389 return ata_mmio_devchk(ap, device);
390 return ata_pio_devchk(ap, device);
394 * ata_dev_classify - determine device type based on ATA-spec signature
395 * @tf: ATA taskfile register set for device to be identified
397 * Determine from taskfile register contents whether a device is
398 * ATA or ATAPI, as per "Signature and persistence" section
399 * of ATA/PI spec (volume 1, sect 5.14).
405 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
406 * the event of failure.
409 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
411 /* Apple's open source Darwin code hints that some devices only
412 * put a proper signature into the LBA mid/high registers,
413 * So, we only check those. It's sufficient for uniqueness.
416 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
417 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
418 DPRINTK("found ATA device by sig\n");
422 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
423 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
424 DPRINTK("found ATAPI device by sig\n");
425 return ATA_DEV_ATAPI;
428 DPRINTK("unknown device\n");
429 return ATA_DEV_UNKNOWN;
433 * ata_dev_try_classify - Parse returned ATA device signature
434 * @ap: ATA channel to examine
435 * @device: Device to examine (starting at zero)
436 * @r_err: Value of error register on completion
438 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
439 * an ATA/ATAPI-defined set of values is placed in the ATA
440 * shadow registers, indicating the results of device detection
443 * Select the ATA device, and read the values from the ATA shadow
444 * registers. Then parse according to the Error register value,
445 * and the spec-defined values examined by ata_dev_classify().
451 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
455 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
457 struct ata_taskfile tf;
461 ap->ops->dev_select(ap, device);
463 memset(&tf, 0, sizeof(tf));
465 ap->ops->tf_read(ap, &tf);
470 /* see if device passed diags */
473 else if ((device == 0) && (err == 0x81))
478 /* determine if device is ATA or ATAPI */
479 class = ata_dev_classify(&tf);
481 if (class == ATA_DEV_UNKNOWN)
483 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
489 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
490 * @id: IDENTIFY DEVICE results we will examine
491 * @s: string into which data is output
492 * @ofs: offset into identify device page
493 * @len: length of string to return. must be an even number.
495 * The strings in the IDENTIFY DEVICE page are broken up into
496 * 16-bit chunks. Run through the string, and output each
497 * 8-bit chunk linearly, regardless of platform.
503 void ata_dev_id_string(const u16 *id, unsigned char *s,
504 unsigned int ofs, unsigned int len)
524 * ata_noop_dev_select - Select device 0/1 on ATA bus
525 * @ap: ATA channel to manipulate
526 * @device: ATA device (numbered from zero) to select
528 * This function performs no actual function.
530 * May be used as the dev_select() entry in ata_port_operations.
535 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
541 * ata_std_dev_select - Select device 0/1 on ATA bus
542 * @ap: ATA channel to manipulate
543 * @device: ATA device (numbered from zero) to select
545 * Use the method defined in the ATA specification to
546 * make either device 0, or device 1, active on the
547 * ATA channel. Works with both PIO and MMIO.
549 * May be used as the dev_select() entry in ata_port_operations.
555 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
560 tmp = ATA_DEVICE_OBS;
562 tmp = ATA_DEVICE_OBS | ATA_DEV1;
564 if (ap->flags & ATA_FLAG_MMIO) {
565 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
567 outb(tmp, ap->ioaddr.device_addr);
569 ata_pause(ap); /* needed; also flushes, for mmio */
573 * ata_dev_select - Select device 0/1 on ATA bus
574 * @ap: ATA channel to manipulate
575 * @device: ATA device (numbered from zero) to select
576 * @wait: non-zero to wait for Status register BSY bit to clear
577 * @can_sleep: non-zero if context allows sleeping
579 * Use the method defined in the ATA specification to
580 * make either device 0, or device 1, active on the
583 * This is a high-level version of ata_std_dev_select(),
584 * which additionally provides the services of inserting
585 * the proper pauses and status polling, where needed.
591 void ata_dev_select(struct ata_port *ap, unsigned int device,
592 unsigned int wait, unsigned int can_sleep)
594 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
595 ap->id, device, wait);
600 ap->ops->dev_select(ap, device);
603 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
610 * ata_dump_id - IDENTIFY DEVICE info debugging output
611 * @dev: Device whose IDENTIFY DEVICE page we will dump
613 * Dump selected 16-bit words from a detected device's
614 * IDENTIFY PAGE page.
620 static inline void ata_dump_id(const struct ata_device *dev)
622 DPRINTK("49==0x%04x "
632 DPRINTK("80==0x%04x "
642 DPRINTK("88==0x%04x "
649 * Compute the PIO modes available for this device. This is not as
650 * trivial as it seems if we must consider early devices correctly.
652 * FIXME: pre IDE drive timing (do we care ?).
655 static unsigned int ata_pio_modes(const struct ata_device *adev)
659 /* Usual case. Word 53 indicates word 64 is valid */
660 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
661 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
667 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
668 number for the maximum. Turn it into a mask and return it */
669 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
671 /* But wait.. there's more. Design your standards by committee and
672 you too can get a free iordy field to process. However its the
673 speeds not the modes that are supported... Note drivers using the
674 timing API will get this right anyway */
678 ata_queue_packet_task(struct ata_port *ap)
680 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
681 queue_work(ata_wq, &ap->packet_task);
685 ata_queue_pio_task(struct ata_port *ap)
687 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
688 queue_work(ata_wq, &ap->pio_task);
692 ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
694 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
695 queue_delayed_work(ata_wq, &ap->pio_task, delay);
699 * ata_flush_pio_tasks - Flush pio_task and packet_task
700 * @ap: the target ata_port
702 * After this function completes, pio_task and packet_task are
703 * guranteed not to be running or scheduled.
706 * Kernel thread context (may sleep)
709 static void ata_flush_pio_tasks(struct ata_port *ap)
716 spin_lock_irqsave(&ap->host_set->lock, flags);
717 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
718 spin_unlock_irqrestore(&ap->host_set->lock, flags);
720 DPRINTK("flush #1\n");
721 flush_workqueue(ata_wq);
724 * At this point, if a task is running, it's guaranteed to see
725 * the FLUSH flag; thus, it will never queue pio tasks again.
728 tmp |= cancel_delayed_work(&ap->pio_task);
729 tmp |= cancel_delayed_work(&ap->packet_task);
731 DPRINTK("flush #2\n");
732 flush_workqueue(ata_wq);
735 spin_lock_irqsave(&ap->host_set->lock, flags);
736 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
737 spin_unlock_irqrestore(&ap->host_set->lock, flags);
742 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
744 struct completion *waiting = qc->private_data;
746 qc->ap->ops->tf_read(qc->ap, &qc->tf);
751 * ata_exec_internal - execute libata internal command
752 * @ap: Port to which the command is sent
753 * @dev: Device to which the command is sent
754 * @tf: Taskfile registers for the command and the result
755 * @dma_dir: Data tranfer direction of the command
756 * @buf: Data buffer of the command
757 * @buflen: Length of data buffer
759 * Executes libata internal command with timeout. @tf contains
760 * command on entry and result on return. Timeout and error
761 * conditions are reported via return value. No recovery action
762 * is taken after a command times out. It's caller's duty to
763 * clean up after timeout.
766 * None. Should be called with kernel context, might sleep.
770 ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
771 struct ata_taskfile *tf,
772 int dma_dir, void *buf, unsigned int buflen)
774 u8 command = tf->command;
775 struct ata_queued_cmd *qc;
776 DECLARE_COMPLETION(wait);
778 unsigned int err_mask;
780 spin_lock_irqsave(&ap->host_set->lock, flags);
782 qc = ata_qc_new_init(ap, dev);
786 qc->dma_dir = dma_dir;
787 if (dma_dir != DMA_NONE) {
788 ata_sg_init_one(qc, buf, buflen);
789 qc->nsect = buflen / ATA_SECT_SIZE;
792 qc->private_data = &wait;
793 qc->complete_fn = ata_qc_complete_internal;
795 qc->err_mask = ata_qc_issue(qc);
799 spin_unlock_irqrestore(&ap->host_set->lock, flags);
801 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
802 spin_lock_irqsave(&ap->host_set->lock, flags);
804 /* We're racing with irq here. If we lose, the
805 * following test prevents us from completing the qc
806 * again. If completion irq occurs after here but
807 * before the caller cleans up, it will result in a
808 * spurious interrupt. We can live with that.
810 if (qc->flags & ATA_QCFLAG_ACTIVE) {
811 qc->err_mask = AC_ERR_TIMEOUT;
813 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
817 spin_unlock_irqrestore(&ap->host_set->lock, flags);
821 err_mask = qc->err_mask;
829 * ata_pio_need_iordy - check if iordy needed
832 * Check if the current speed of the device requires IORDY. Used
833 * by various controllers for chip configuration.
836 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
839 int speed = adev->pio_mode - XFER_PIO_0;
846 /* If we have no drive specific rule, then PIO 2 is non IORDY */
848 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
849 pio = adev->id[ATA_ID_EIDE_PIO];
850 /* Is the speed faster than the drive allows non IORDY ? */
852 /* This is cycle times not frequency - watch the logic! */
853 if (pio > 240) /* PIO2 is 240nS per cycle */
862 * ata_dev_identify - obtain IDENTIFY x DEVICE page
863 * @ap: port on which device we wish to probe resides
864 * @device: device bus address, starting at zero
866 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
867 * command, and read back the 512-byte device information page.
868 * The device information page is fed to us via the standard
869 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
870 * using standard PIO-IN paths)
872 * After reading the device information page, we use several
873 * bits of information from it to initialize data structures
874 * that will be used during the lifetime of the ata_device.
875 * Other data from the info page is used to disqualify certain
876 * older ATA devices we do not wish to support.
879 * Inherited from caller. Some functions called by this function
880 * obtain the host_set lock.
883 static void ata_dev_identify(struct ata_port *ap, unsigned int device)
885 struct ata_device *dev = &ap->device[device];
886 unsigned int major_version;
888 unsigned long xfer_modes;
889 unsigned int using_edd;
890 struct ata_taskfile tf;
891 unsigned int err_mask;
894 if (!ata_dev_present(dev)) {
895 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
900 if (ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
905 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
907 WARN_ON(dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ATAPI &&
908 dev->class != ATA_DEV_NONE);
910 ata_dev_select(ap, device, 1, 1); /* select device 0/1 */
913 ata_tf_init(ap, &tf, device);
915 if (dev->class == ATA_DEV_ATA) {
916 tf.command = ATA_CMD_ID_ATA;
917 DPRINTK("do ATA identify\n");
919 tf.command = ATA_CMD_ID_ATAPI;
920 DPRINTK("do ATAPI identify\n");
923 tf.protocol = ATA_PROT_PIO;
925 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
926 dev->id, sizeof(dev->id));
929 if (err_mask & ~AC_ERR_DEV)
933 * arg! EDD works for all test cases, but seems to return
934 * the ATA signature for some ATAPI devices. Until the
935 * reason for this is found and fixed, we fix up the mess
936 * here. If IDENTIFY DEVICE returns command aborted
937 * (as ATAPI devices do), then we issue an
938 * IDENTIFY PACKET DEVICE.
940 * ATA software reset (SRST, the default) does not appear
941 * to have this problem.
943 if ((using_edd) && (dev->class == ATA_DEV_ATA)) {
945 if (err & ATA_ABORTED) {
946 dev->class = ATA_DEV_ATAPI;
953 swap_buf_le16(dev->id, ATA_ID_WORDS);
955 /* print device capabilities */
956 printk(KERN_DEBUG "ata%u: dev %u cfg "
957 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
958 ap->id, device, dev->id[49],
959 dev->id[82], dev->id[83], dev->id[84],
960 dev->id[85], dev->id[86], dev->id[87],
964 * common ATA, ATAPI feature tests
967 /* we require DMA support (bits 8 of word 49) */
968 if (!ata_id_has_dma(dev->id)) {
969 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
973 /* quick-n-dirty find max transfer mode; for printk only */
974 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
976 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
978 xfer_modes = ata_pio_modes(dev);
982 /* ATA-specific feature tests */
983 if (dev->class == ATA_DEV_ATA) {
984 if (!ata_id_is_ata(dev->id)) /* sanity check */
987 /* get major version */
988 tmp = dev->id[ATA_ID_MAJOR_VER];
989 for (major_version = 14; major_version >= 1; major_version--)
990 if (tmp & (1 << major_version))
994 * The exact sequence expected by certain pre-ATA4 drives is:
997 * INITIALIZE DEVICE PARAMETERS
999 * Some drives were very specific about that exact sequence.
1001 if (major_version < 4 || (!ata_id_has_lba(dev->id))) {
1002 ata_dev_init_params(ap, dev);
1004 /* current CHS translation info (id[53-58]) might be
1005 * changed. reread the identify device info.
1007 ata_dev_reread_id(ap, dev);
1010 if (ata_id_has_lba(dev->id)) {
1011 dev->flags |= ATA_DFLAG_LBA;
1013 if (ata_id_has_lba48(dev->id)) {
1014 dev->flags |= ATA_DFLAG_LBA48;
1015 dev->n_sectors = ata_id_u64(dev->id, 100);
1017 dev->n_sectors = ata_id_u32(dev->id, 60);
1020 /* print device info to dmesg */
1021 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1024 ata_mode_string(xfer_modes),
1025 (unsigned long long)dev->n_sectors,
1026 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1030 /* Default translation */
1031 dev->cylinders = dev->id[1];
1032 dev->heads = dev->id[3];
1033 dev->sectors = dev->id[6];
1034 dev->n_sectors = dev->cylinders * dev->heads * dev->sectors;
1036 if (ata_id_current_chs_valid(dev->id)) {
1037 /* Current CHS translation is valid. */
1038 dev->cylinders = dev->id[54];
1039 dev->heads = dev->id[55];
1040 dev->sectors = dev->id[56];
1042 dev->n_sectors = ata_id_u32(dev->id, 57);
1045 /* print device info to dmesg */
1046 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1049 ata_mode_string(xfer_modes),
1050 (unsigned long long)dev->n_sectors,
1051 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1055 ap->host->max_cmd_len = 16;
1058 /* ATAPI-specific feature tests */
1059 else if (dev->class == ATA_DEV_ATAPI) {
1060 if (ata_id_is_ata(dev->id)) /* sanity check */
1063 rc = atapi_cdb_len(dev->id);
1064 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1065 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1068 ap->cdb_len = (unsigned int) rc;
1069 ap->host->max_cmd_len = (unsigned char) ap->cdb_len;
1071 /* print device info to dmesg */
1072 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1074 ata_mode_string(xfer_modes));
1077 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1081 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1084 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1085 DPRINTK("EXIT, err\n");
1089 static inline u8 ata_dev_knobble(const struct ata_port *ap)
1091 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ap->device->id)));
1095 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1102 void ata_dev_config(struct ata_port *ap, unsigned int i)
1104 /* limit bridge transfers to udma5, 200 sectors */
1105 if (ata_dev_knobble(ap)) {
1106 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1107 ap->id, ap->device->devno);
1108 ap->udma_mask &= ATA_UDMA5;
1109 ap->host->max_sectors = ATA_MAX_SECTORS;
1110 ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
1111 ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
1114 if (ap->ops->dev_config)
1115 ap->ops->dev_config(ap, &ap->device[i]);
1119 * ata_bus_probe - Reset and probe ATA bus
1122 * Master ATA bus probing function. Initiates a hardware-dependent
1123 * bus reset, then attempts to identify any devices found on
1127 * PCI/etc. bus probe sem.
1130 * Zero on success, non-zero on error.
1133 static int ata_bus_probe(struct ata_port *ap)
1135 unsigned int i, found = 0;
1137 if (ap->ops->probe_reset) {
1138 unsigned int classes[ATA_MAX_DEVICES];
1143 rc = ap->ops->probe_reset(ap, classes);
1145 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1146 if (classes[i] == ATA_DEV_UNKNOWN)
1147 classes[i] = ATA_DEV_NONE;
1148 ap->device[i].class = classes[i];
1151 printk(KERN_ERR "ata%u: probe reset failed, "
1152 "disabling port\n", ap->id);
1153 ata_port_disable(ap);
1156 ap->ops->phy_reset(ap);
1158 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1161 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1162 ata_dev_identify(ap, i);
1163 if (ata_dev_present(&ap->device[i])) {
1165 ata_dev_config(ap,i);
1169 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1170 goto err_out_disable;
1173 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1174 goto err_out_disable;
1179 ap->ops->port_disable(ap);
1185 * ata_port_probe - Mark port as enabled
1186 * @ap: Port for which we indicate enablement
1188 * Modify @ap data structure such that the system
1189 * thinks that the entire port is enabled.
1191 * LOCKING: host_set lock, or some other form of
1195 void ata_port_probe(struct ata_port *ap)
1197 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1201 * sata_print_link_status - Print SATA link status
1202 * @ap: SATA port to printk link status about
1204 * This function prints link speed and status of a SATA link.
1209 static void sata_print_link_status(struct ata_port *ap)
1214 if (!ap->ops->scr_read)
1217 sstatus = scr_read(ap, SCR_STATUS);
1219 if (sata_dev_present(ap)) {
1220 tmp = (sstatus >> 4) & 0xf;
1223 else if (tmp & (1 << 1))
1226 speed = "<unknown>";
1227 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1228 ap->id, speed, sstatus);
1230 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1236 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1237 * @ap: SATA port associated with target SATA PHY.
1239 * This function issues commands to standard SATA Sxxx
1240 * PHY registers, to wake up the phy (and device), and
1241 * clear any reset condition.
1244 * PCI/etc. bus probe sem.
1247 void __sata_phy_reset(struct ata_port *ap)
1250 unsigned long timeout = jiffies + (HZ * 5);
1252 if (ap->flags & ATA_FLAG_SATA_RESET) {
1253 /* issue phy wake/reset */
1254 scr_write_flush(ap, SCR_CONTROL, 0x301);
1255 /* Couldn't find anything in SATA I/II specs, but
1256 * AHCI-1.1 10.4.2 says at least 1 ms. */
1259 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1261 /* wait for phy to become ready, if necessary */
1264 sstatus = scr_read(ap, SCR_STATUS);
1265 if ((sstatus & 0xf) != 1)
1267 } while (time_before(jiffies, timeout));
1269 /* print link status */
1270 sata_print_link_status(ap);
1272 /* TODO: phy layer with polling, timeouts, etc. */
1273 if (sata_dev_present(ap))
1276 ata_port_disable(ap);
1278 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1281 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1282 ata_port_disable(ap);
1286 ap->cbl = ATA_CBL_SATA;
1290 * sata_phy_reset - Reset SATA bus.
1291 * @ap: SATA port associated with target SATA PHY.
1293 * This function resets the SATA bus, and then probes
1294 * the bus for devices.
1297 * PCI/etc. bus probe sem.
1300 void sata_phy_reset(struct ata_port *ap)
1302 __sata_phy_reset(ap);
1303 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1309 * ata_port_disable - Disable port.
1310 * @ap: Port to be disabled.
1312 * Modify @ap data structure such that the system
1313 * thinks that the entire port is disabled, and should
1314 * never attempt to probe or communicate with devices
1317 * LOCKING: host_set lock, or some other form of
1321 void ata_port_disable(struct ata_port *ap)
1323 ap->device[0].class = ATA_DEV_NONE;
1324 ap->device[1].class = ATA_DEV_NONE;
1325 ap->flags |= ATA_FLAG_PORT_DISABLED;
1329 * This mode timing computation functionality is ported over from
1330 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1333 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1334 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1335 * for PIO 5, which is a nonstandard extension and UDMA6, which
1336 * is currently supported only by Maxtor drives.
1339 static const struct ata_timing ata_timing[] = {
1341 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1342 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1343 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1344 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1346 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1347 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1348 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1350 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1352 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1353 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1354 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1356 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1357 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1358 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1360 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1361 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1362 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1364 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1365 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1366 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1368 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1373 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1374 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1376 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1378 q->setup = EZ(t->setup * 1000, T);
1379 q->act8b = EZ(t->act8b * 1000, T);
1380 q->rec8b = EZ(t->rec8b * 1000, T);
1381 q->cyc8b = EZ(t->cyc8b * 1000, T);
1382 q->active = EZ(t->active * 1000, T);
1383 q->recover = EZ(t->recover * 1000, T);
1384 q->cycle = EZ(t->cycle * 1000, T);
1385 q->udma = EZ(t->udma * 1000, UT);
1388 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1389 struct ata_timing *m, unsigned int what)
1391 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1392 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1393 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1394 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1395 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1396 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1397 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1398 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1401 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1403 const struct ata_timing *t;
1405 for (t = ata_timing; t->mode != speed; t++)
1406 if (t->mode == 0xFF)
1411 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1412 struct ata_timing *t, int T, int UT)
1414 const struct ata_timing *s;
1415 struct ata_timing p;
1421 if (!(s = ata_timing_find_mode(speed)))
1424 memcpy(t, s, sizeof(*s));
1427 * If the drive is an EIDE drive, it can tell us it needs extended
1428 * PIO/MW_DMA cycle timing.
1431 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1432 memset(&p, 0, sizeof(p));
1433 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1434 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1435 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1436 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1437 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1439 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1443 * Convert the timing to bus clock counts.
1446 ata_timing_quantize(t, t, T, UT);
1449 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1450 * S.M.A.R.T * and some other commands. We have to ensure that the
1451 * DMA cycle timing is slower/equal than the fastest PIO timing.
1454 if (speed > XFER_PIO_4) {
1455 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1456 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1460 * Lengthen active & recovery time so that cycle time is correct.
1463 if (t->act8b + t->rec8b < t->cyc8b) {
1464 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1465 t->rec8b = t->cyc8b - t->act8b;
1468 if (t->active + t->recover < t->cycle) {
1469 t->active += (t->cycle - (t->active + t->recover)) / 2;
1470 t->recover = t->cycle - t->active;
1476 static const struct {
1479 } xfer_mode_classes[] = {
1480 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1481 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1482 { ATA_SHIFT_PIO, XFER_PIO_0 },
1485 static u8 base_from_shift(unsigned int shift)
1489 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1490 if (xfer_mode_classes[i].shift == shift)
1491 return xfer_mode_classes[i].base;
1496 static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1501 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1504 if (dev->xfer_shift == ATA_SHIFT_PIO)
1505 dev->flags |= ATA_DFLAG_PIO;
1507 ata_dev_set_xfermode(ap, dev);
1509 base = base_from_shift(dev->xfer_shift);
1510 ofs = dev->xfer_mode - base;
1511 idx = ofs + dev->xfer_shift;
1512 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1514 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1515 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1517 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1518 ap->id, dev->devno, xfer_mode_str[idx]);
1521 static int ata_host_set_pio(struct ata_port *ap)
1527 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1530 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1534 base = base_from_shift(ATA_SHIFT_PIO);
1535 xfer_mode = base + x;
1537 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1538 (int)base, (int)xfer_mode, mask, x);
1540 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1541 struct ata_device *dev = &ap->device[i];
1542 if (ata_dev_present(dev)) {
1543 dev->pio_mode = xfer_mode;
1544 dev->xfer_mode = xfer_mode;
1545 dev->xfer_shift = ATA_SHIFT_PIO;
1546 if (ap->ops->set_piomode)
1547 ap->ops->set_piomode(ap, dev);
1554 static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1555 unsigned int xfer_shift)
1559 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1560 struct ata_device *dev = &ap->device[i];
1561 if (ata_dev_present(dev)) {
1562 dev->dma_mode = xfer_mode;
1563 dev->xfer_mode = xfer_mode;
1564 dev->xfer_shift = xfer_shift;
1565 if (ap->ops->set_dmamode)
1566 ap->ops->set_dmamode(ap, dev);
1572 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1573 * @ap: port on which timings will be programmed
1575 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1578 * PCI/etc. bus probe sem.
1580 static void ata_set_mode(struct ata_port *ap)
1582 unsigned int xfer_shift;
1586 /* step 1: always set host PIO timings */
1587 rc = ata_host_set_pio(ap);
1591 /* step 2: choose the best data xfer mode */
1592 xfer_mode = xfer_shift = 0;
1593 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1597 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1598 if (xfer_shift != ATA_SHIFT_PIO)
1599 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1601 /* step 4: update devices' xfer mode */
1602 ata_dev_set_mode(ap, &ap->device[0]);
1603 ata_dev_set_mode(ap, &ap->device[1]);
1605 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1608 if (ap->ops->post_set_mode)
1609 ap->ops->post_set_mode(ap);
1614 ata_port_disable(ap);
1618 * ata_tf_to_host - issue ATA taskfile to host controller
1619 * @ap: port to which command is being issued
1620 * @tf: ATA taskfile register set
1622 * Issues ATA taskfile register set to ATA host controller,
1623 * with proper synchronization with interrupt handler and
1627 * spin_lock_irqsave(host_set lock)
1630 static inline void ata_tf_to_host(struct ata_port *ap,
1631 const struct ata_taskfile *tf)
1633 ap->ops->tf_load(ap, tf);
1634 ap->ops->exec_command(ap, tf);
1638 * ata_busy_sleep - sleep until BSY clears, or timeout
1639 * @ap: port containing status register to be polled
1640 * @tmout_pat: impatience timeout
1641 * @tmout: overall timeout
1643 * Sleep until ATA Status register bit BSY clears,
1644 * or a timeout occurs.
1649 unsigned int ata_busy_sleep (struct ata_port *ap,
1650 unsigned long tmout_pat, unsigned long tmout)
1652 unsigned long timer_start, timeout;
1655 status = ata_busy_wait(ap, ATA_BUSY, 300);
1656 timer_start = jiffies;
1657 timeout = timer_start + tmout_pat;
1658 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1660 status = ata_busy_wait(ap, ATA_BUSY, 3);
1663 if (status & ATA_BUSY)
1664 printk(KERN_WARNING "ata%u is slow to respond, "
1665 "please be patient\n", ap->id);
1667 timeout = timer_start + tmout;
1668 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1670 status = ata_chk_status(ap);
1673 if (status & ATA_BUSY) {
1674 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1675 ap->id, tmout / HZ);
1682 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1684 struct ata_ioports *ioaddr = &ap->ioaddr;
1685 unsigned int dev0 = devmask & (1 << 0);
1686 unsigned int dev1 = devmask & (1 << 1);
1687 unsigned long timeout;
1689 /* if device 0 was found in ata_devchk, wait for its
1693 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1695 /* if device 1 was found in ata_devchk, wait for
1696 * register access, then wait for BSY to clear
1698 timeout = jiffies + ATA_TMOUT_BOOT;
1702 ap->ops->dev_select(ap, 1);
1703 if (ap->flags & ATA_FLAG_MMIO) {
1704 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1705 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1707 nsect = inb(ioaddr->nsect_addr);
1708 lbal = inb(ioaddr->lbal_addr);
1710 if ((nsect == 1) && (lbal == 1))
1712 if (time_after(jiffies, timeout)) {
1716 msleep(50); /* give drive a breather */
1719 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1721 /* is all this really necessary? */
1722 ap->ops->dev_select(ap, 0);
1724 ap->ops->dev_select(ap, 1);
1726 ap->ops->dev_select(ap, 0);
1730 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1731 * @ap: Port to reset and probe
1733 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1734 * probe the bus. Not often used these days.
1737 * PCI/etc. bus probe sem.
1738 * Obtains host_set lock.
1742 static unsigned int ata_bus_edd(struct ata_port *ap)
1744 struct ata_taskfile tf;
1745 unsigned long flags;
1747 /* set up execute-device-diag (bus reset) taskfile */
1748 /* also, take interrupts to a known state (disabled) */
1749 DPRINTK("execute-device-diag\n");
1750 ata_tf_init(ap, &tf, 0);
1752 tf.command = ATA_CMD_EDD;
1753 tf.protocol = ATA_PROT_NODATA;
1756 spin_lock_irqsave(&ap->host_set->lock, flags);
1757 ata_tf_to_host(ap, &tf);
1758 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1760 /* spec says at least 2ms. but who knows with those
1761 * crazy ATAPI devices...
1765 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1768 static unsigned int ata_bus_softreset(struct ata_port *ap,
1769 unsigned int devmask)
1771 struct ata_ioports *ioaddr = &ap->ioaddr;
1773 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1775 /* software reset. causes dev0 to be selected */
1776 if (ap->flags & ATA_FLAG_MMIO) {
1777 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1778 udelay(20); /* FIXME: flush */
1779 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1780 udelay(20); /* FIXME: flush */
1781 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1783 outb(ap->ctl, ioaddr->ctl_addr);
1785 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1787 outb(ap->ctl, ioaddr->ctl_addr);
1790 /* spec mandates ">= 2ms" before checking status.
1791 * We wait 150ms, because that was the magic delay used for
1792 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1793 * between when the ATA command register is written, and then
1794 * status is checked. Because waiting for "a while" before
1795 * checking status is fine, post SRST, we perform this magic
1796 * delay here as well.
1800 ata_bus_post_reset(ap, devmask);
1806 * ata_bus_reset - reset host port and associated ATA channel
1807 * @ap: port to reset
1809 * This is typically the first time we actually start issuing
1810 * commands to the ATA channel. We wait for BSY to clear, then
1811 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1812 * result. Determine what devices, if any, are on the channel
1813 * by looking at the device 0/1 error register. Look at the signature
1814 * stored in each device's taskfile registers, to determine if
1815 * the device is ATA or ATAPI.
1818 * PCI/etc. bus probe sem.
1819 * Obtains host_set lock.
1822 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1825 void ata_bus_reset(struct ata_port *ap)
1827 struct ata_ioports *ioaddr = &ap->ioaddr;
1828 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1830 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
1832 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
1834 /* determine if device 0/1 are present */
1835 if (ap->flags & ATA_FLAG_SATA_RESET)
1838 dev0 = ata_devchk(ap, 0);
1840 dev1 = ata_devchk(ap, 1);
1844 devmask |= (1 << 0);
1846 devmask |= (1 << 1);
1848 /* select device 0 again */
1849 ap->ops->dev_select(ap, 0);
1851 /* issue bus reset */
1852 if (ap->flags & ATA_FLAG_SRST)
1853 rc = ata_bus_softreset(ap, devmask);
1854 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
1855 /* set up device control */
1856 if (ap->flags & ATA_FLAG_MMIO)
1857 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1859 outb(ap->ctl, ioaddr->ctl_addr);
1860 rc = ata_bus_edd(ap);
1867 * determine by signature whether we have ATA or ATAPI devices
1869 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
1870 if ((slave_possible) && (err != 0x81))
1871 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
1873 /* re-enable interrupts */
1874 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
1877 /* is double-select really necessary? */
1878 if (ap->device[1].class != ATA_DEV_NONE)
1879 ap->ops->dev_select(ap, 1);
1880 if (ap->device[0].class != ATA_DEV_NONE)
1881 ap->ops->dev_select(ap, 0);
1883 /* if no devices were detected, disable this port */
1884 if ((ap->device[0].class == ATA_DEV_NONE) &&
1885 (ap->device[1].class == ATA_DEV_NONE))
1888 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
1889 /* set up device control for ATA_FLAG_SATA_RESET */
1890 if (ap->flags & ATA_FLAG_MMIO)
1891 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1893 outb(ap->ctl, ioaddr->ctl_addr);
1900 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
1901 ap->ops->port_disable(ap);
1906 static int sata_phy_resume(struct ata_port *ap)
1908 unsigned long timeout = jiffies + (HZ * 5);
1911 scr_write_flush(ap, SCR_CONTROL, 0x300);
1913 /* Wait for phy to become ready, if necessary. */
1916 sstatus = scr_read(ap, SCR_STATUS);
1917 if ((sstatus & 0xf) != 1)
1919 } while (time_before(jiffies, timeout));
1925 * ata_std_probeinit - initialize probing
1926 * @ap: port to be probed
1928 * @ap is about to be probed. Initialize it. This function is
1929 * to be used as standard callback for ata_drive_probe_reset().
1931 * NOTE!!! Do not use this function as probeinit if a low level
1932 * driver implements only hardreset. Just pass NULL as probeinit
1933 * in that case. Using this function is probably okay but doing
1934 * so makes reset sequence different from the original
1935 * ->phy_reset implementation and Jeff nervous. :-P
1937 extern void ata_std_probeinit(struct ata_port *ap)
1939 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
1940 sata_phy_resume(ap);
1941 if (sata_dev_present(ap))
1942 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1947 * ata_std_softreset - reset host port via ATA SRST
1948 * @ap: port to reset
1949 * @verbose: fail verbosely
1950 * @classes: resulting classes of attached devices
1952 * Reset host port using ATA SRST. This function is to be used
1953 * as standard callback for ata_drive_*_reset() functions.
1956 * Kernel thread context (may sleep)
1959 * 0 on success, -errno otherwise.
1961 int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
1963 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1964 unsigned int devmask = 0, err_mask;
1969 if (ap->ops->scr_read && !sata_dev_present(ap)) {
1970 classes[0] = ATA_DEV_NONE;
1974 /* determine if device 0/1 are present */
1975 if (ata_devchk(ap, 0))
1976 devmask |= (1 << 0);
1977 if (slave_possible && ata_devchk(ap, 1))
1978 devmask |= (1 << 1);
1980 /* select device 0 again */
1981 ap->ops->dev_select(ap, 0);
1983 /* issue bus reset */
1984 DPRINTK("about to softreset, devmask=%x\n", devmask);
1985 err_mask = ata_bus_softreset(ap, devmask);
1988 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
1991 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
1996 /* determine by signature whether we have ATA or ATAPI devices */
1997 classes[0] = ata_dev_try_classify(ap, 0, &err);
1998 if (slave_possible && err != 0x81)
1999 classes[1] = ata_dev_try_classify(ap, 1, &err);
2002 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2007 * sata_std_hardreset - reset host port via SATA phy reset
2008 * @ap: port to reset
2009 * @verbose: fail verbosely
2010 * @class: resulting class of attached device
2012 * SATA phy-reset host port using DET bits of SControl register.
2013 * This function is to be used as standard callback for
2014 * ata_drive_*_reset().
2017 * Kernel thread context (may sleep)
2020 * 0 on success, -errno otherwise.
2022 int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2026 /* Issue phy wake/reset */
2027 scr_write_flush(ap, SCR_CONTROL, 0x301);
2030 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2031 * 10.4.2 says at least 1 ms.
2035 /* Bring phy back */
2036 sata_phy_resume(ap);
2038 /* TODO: phy layer with polling, timeouts, etc. */
2039 if (!sata_dev_present(ap)) {
2040 *class = ATA_DEV_NONE;
2041 DPRINTK("EXIT, link offline\n");
2045 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2047 printk(KERN_ERR "ata%u: COMRESET failed "
2048 "(device not ready)\n", ap->id);
2050 DPRINTK("EXIT, device not ready\n");
2054 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2056 *class = ata_dev_try_classify(ap, 0, NULL);
2058 DPRINTK("EXIT, class=%u\n", *class);
2063 * ata_std_postreset - standard postreset callback
2064 * @ap: the target ata_port
2065 * @classes: classes of attached devices
2067 * This function is invoked after a successful reset. Note that
2068 * the device might have been reset more than once using
2069 * different reset methods before postreset is invoked.
2070 * postreset is also reponsible for setting cable type.
2072 * This function is to be used as standard callback for
2073 * ata_drive_*_reset().
2076 * Kernel thread context (may sleep)
2078 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2082 /* set cable type */
2083 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2084 ap->cbl = ATA_CBL_SATA;
2086 /* print link status */
2087 if (ap->cbl == ATA_CBL_SATA)
2088 sata_print_link_status(ap);
2090 /* re-enable interrupts */
2091 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2094 /* is double-select really necessary? */
2095 if (classes[0] != ATA_DEV_NONE)
2096 ap->ops->dev_select(ap, 1);
2097 if (classes[1] != ATA_DEV_NONE)
2098 ap->ops->dev_select(ap, 0);
2100 /* bail out if no device is present */
2101 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2102 DPRINTK("EXIT, no device\n");
2106 /* set up device control */
2107 if (ap->ioaddr.ctl_addr) {
2108 if (ap->flags & ATA_FLAG_MMIO)
2109 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2111 outb(ap->ctl, ap->ioaddr.ctl_addr);
2118 * ata_std_probe_reset - standard probe reset method
2119 * @ap: prot to perform probe-reset
2120 * @classes: resulting classes of attached devices
2122 * The stock off-the-shelf ->probe_reset method.
2125 * Kernel thread context (may sleep)
2128 * 0 on success, -errno otherwise.
2130 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2132 ata_reset_fn_t hardreset;
2135 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2136 hardreset = sata_std_hardreset;
2138 return ata_drive_probe_reset(ap, ata_std_probeinit,
2139 ata_std_softreset, hardreset,
2140 ata_std_postreset, classes);
2143 static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2144 ata_postreset_fn_t postreset,
2145 unsigned int *classes)
2149 for (i = 0; i < ATA_MAX_DEVICES; i++)
2150 classes[i] = ATA_DEV_UNKNOWN;
2152 rc = reset(ap, 0, classes);
2156 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2157 * is complete and convert all ATA_DEV_UNKNOWN to
2160 for (i = 0; i < ATA_MAX_DEVICES; i++)
2161 if (classes[i] != ATA_DEV_UNKNOWN)
2164 if (i < ATA_MAX_DEVICES)
2165 for (i = 0; i < ATA_MAX_DEVICES; i++)
2166 if (classes[i] == ATA_DEV_UNKNOWN)
2167 classes[i] = ATA_DEV_NONE;
2170 postreset(ap, classes);
2172 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2176 * ata_drive_probe_reset - Perform probe reset with given methods
2177 * @ap: port to reset
2178 * @probeinit: probeinit method (can be NULL)
2179 * @softreset: softreset method (can be NULL)
2180 * @hardreset: hardreset method (can be NULL)
2181 * @postreset: postreset method (can be NULL)
2182 * @classes: resulting classes of attached devices
2184 * Reset the specified port and classify attached devices using
2185 * given methods. This function prefers softreset but tries all
2186 * possible reset sequences to reset and classify devices. This
2187 * function is intended to be used for constructing ->probe_reset
2188 * callback by low level drivers.
2190 * Reset methods should follow the following rules.
2192 * - Return 0 on sucess, -errno on failure.
2193 * - If classification is supported, fill classes[] with
2194 * recognized class codes.
2195 * - If classification is not supported, leave classes[] alone.
2196 * - If verbose is non-zero, print error message on failure;
2197 * otherwise, shut up.
2200 * Kernel thread context (may sleep)
2203 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2204 * if classification fails, and any error code from reset
2207 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2208 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2209 ata_postreset_fn_t postreset, unsigned int *classes)
2217 rc = do_probe_reset(ap, softreset, postreset, classes);
2225 rc = do_probe_reset(ap, hardreset, postreset, classes);
2226 if (rc == 0 || rc != -ENODEV)
2230 rc = do_probe_reset(ap, softreset, postreset, classes);
2235 static void ata_pr_blacklisted(const struct ata_port *ap,
2236 const struct ata_device *dev)
2238 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2239 ap->id, dev->devno);
2242 static const char * const ata_dma_blacklist [] = {
2261 "Toshiba CD-ROM XM-6202B",
2262 "TOSHIBA CD-ROM XM-1702BC",
2264 "E-IDE CD-ROM CR-840",
2267 "SAMSUNG CD-ROM SC-148C",
2268 "SAMSUNG CD-ROM SC",
2270 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2274 static int ata_dma_blacklisted(const struct ata_device *dev)
2276 unsigned char model_num[40];
2281 ata_dev_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2284 len = strnlen(s, sizeof(model_num));
2286 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2287 while ((len > 0) && (s[len - 1] == ' ')) {
2292 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2293 if (!strncmp(ata_dma_blacklist[i], s, len))
2299 static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
2301 const struct ata_device *master, *slave;
2304 master = &ap->device[0];
2305 slave = &ap->device[1];
2307 WARN_ON(!ata_dev_present(master) && !ata_dev_present(slave));
2309 if (shift == ATA_SHIFT_UDMA) {
2310 mask = ap->udma_mask;
2311 if (ata_dev_present(master)) {
2312 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
2313 if (ata_dma_blacklisted(master)) {
2315 ata_pr_blacklisted(ap, master);
2318 if (ata_dev_present(slave)) {
2319 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
2320 if (ata_dma_blacklisted(slave)) {
2322 ata_pr_blacklisted(ap, slave);
2326 else if (shift == ATA_SHIFT_MWDMA) {
2327 mask = ap->mwdma_mask;
2328 if (ata_dev_present(master)) {
2329 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
2330 if (ata_dma_blacklisted(master)) {
2332 ata_pr_blacklisted(ap, master);
2335 if (ata_dev_present(slave)) {
2336 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
2337 if (ata_dma_blacklisted(slave)) {
2339 ata_pr_blacklisted(ap, slave);
2343 else if (shift == ATA_SHIFT_PIO) {
2344 mask = ap->pio_mask;
2345 if (ata_dev_present(master)) {
2346 /* spec doesn't return explicit support for
2347 * PIO0-2, so we fake it
2349 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2354 if (ata_dev_present(slave)) {
2355 /* spec doesn't return explicit support for
2356 * PIO0-2, so we fake it
2358 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2365 mask = 0xffffffff; /* shut up compiler warning */
2372 /* find greatest bit */
2373 static int fgb(u32 bitmap)
2378 for (i = 0; i < 32; i++)
2379 if (bitmap & (1 << i))
2386 * ata_choose_xfer_mode - attempt to find best transfer mode
2387 * @ap: Port for which an xfer mode will be selected
2388 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2389 * @xfer_shift_out: (output) bit shift that selects this mode
2391 * Based on host and device capabilities, determine the
2392 * maximum transfer mode that is amenable to all.
2395 * PCI/etc. bus probe sem.
2398 * Zero on success, negative on error.
2401 static int ata_choose_xfer_mode(const struct ata_port *ap,
2403 unsigned int *xfer_shift_out)
2405 unsigned int mask, shift;
2408 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2409 shift = xfer_mode_classes[i].shift;
2410 mask = ata_get_mode_mask(ap, shift);
2414 *xfer_mode_out = xfer_mode_classes[i].base + x;
2415 *xfer_shift_out = shift;
2424 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2425 * @ap: Port associated with device @dev
2426 * @dev: Device to which command will be sent
2428 * Issue SET FEATURES - XFER MODE command to device @dev
2432 * PCI/etc. bus probe sem.
2435 static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2437 struct ata_taskfile tf;
2439 /* set up set-features taskfile */
2440 DPRINTK("set features - xfer mode\n");
2442 ata_tf_init(ap, &tf, dev->devno);
2443 tf.command = ATA_CMD_SET_FEATURES;
2444 tf.feature = SETFEATURES_XFER;
2445 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2446 tf.protocol = ATA_PROT_NODATA;
2447 tf.nsect = dev->xfer_mode;
2449 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2450 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2452 ata_port_disable(ap);
2459 * ata_dev_reread_id - Reread the device identify device info
2460 * @ap: port where the device is
2461 * @dev: device to reread the identify device info
2466 static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev)
2468 struct ata_taskfile tf;
2470 ata_tf_init(ap, &tf, dev->devno);
2472 if (dev->class == ATA_DEV_ATA) {
2473 tf.command = ATA_CMD_ID_ATA;
2474 DPRINTK("do ATA identify\n");
2476 tf.command = ATA_CMD_ID_ATAPI;
2477 DPRINTK("do ATAPI identify\n");
2480 tf.flags |= ATA_TFLAG_DEVICE;
2481 tf.protocol = ATA_PROT_PIO;
2483 if (ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
2484 dev->id, sizeof(dev->id)))
2487 swap_buf_le16(dev->id, ATA_ID_WORDS);
2495 printk(KERN_ERR "ata%u: failed to reread ID, disabled\n", ap->id);
2496 ata_port_disable(ap);
2500 * ata_dev_init_params - Issue INIT DEV PARAMS command
2501 * @ap: Port associated with device @dev
2502 * @dev: Device to which command will be sent
2507 static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev)
2509 struct ata_taskfile tf;
2510 u16 sectors = dev->id[6];
2511 u16 heads = dev->id[3];
2513 /* Number of sectors per track 1-255. Number of heads 1-16 */
2514 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2517 /* set up init dev params taskfile */
2518 DPRINTK("init dev params \n");
2520 ata_tf_init(ap, &tf, dev->devno);
2521 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2522 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2523 tf.protocol = ATA_PROT_NODATA;
2525 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
2527 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2528 printk(KERN_ERR "ata%u: failed to init parameters, disabled\n",
2530 ata_port_disable(ap);
2537 * ata_sg_clean - Unmap DMA memory associated with command
2538 * @qc: Command containing DMA memory to be released
2540 * Unmap all mapped DMA memory associated with this command.
2543 * spin_lock_irqsave(host_set lock)
2546 static void ata_sg_clean(struct ata_queued_cmd *qc)
2548 struct ata_port *ap = qc->ap;
2549 struct scatterlist *sg = qc->__sg;
2550 int dir = qc->dma_dir;
2551 void *pad_buf = NULL;
2553 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
2554 WARN_ON(sg == NULL);
2556 if (qc->flags & ATA_QCFLAG_SINGLE)
2557 WARN_ON(qc->n_elem != 1);
2559 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
2561 /* if we padded the buffer out to 32-bit bound, and data
2562 * xfer direction is from-device, we must copy from the
2563 * pad buffer back into the supplied buffer
2565 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2566 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2568 if (qc->flags & ATA_QCFLAG_SG) {
2570 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2571 /* restore last sg */
2572 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2574 struct scatterlist *psg = &qc->pad_sgent;
2575 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2576 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2577 kunmap_atomic(addr, KM_IRQ0);
2580 if (sg_dma_len(&sg[0]) > 0)
2581 dma_unmap_single(ap->host_set->dev,
2582 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2585 sg->length += qc->pad_len;
2587 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2588 pad_buf, qc->pad_len);
2591 qc->flags &= ~ATA_QCFLAG_DMAMAP;
2596 * ata_fill_sg - Fill PCI IDE PRD table
2597 * @qc: Metadata associated with taskfile to be transferred
2599 * Fill PCI IDE PRD (scatter-gather) table with segments
2600 * associated with the current disk command.
2603 * spin_lock_irqsave(host_set lock)
2606 static void ata_fill_sg(struct ata_queued_cmd *qc)
2608 struct ata_port *ap = qc->ap;
2609 struct scatterlist *sg;
2612 WARN_ON(qc->__sg == NULL);
2613 WARN_ON(qc->n_elem == 0);
2616 ata_for_each_sg(sg, qc) {
2620 /* determine if physical DMA addr spans 64K boundary.
2621 * Note h/w doesn't support 64-bit, so we unconditionally
2622 * truncate dma_addr_t to u32.
2624 addr = (u32) sg_dma_address(sg);
2625 sg_len = sg_dma_len(sg);
2628 offset = addr & 0xffff;
2630 if ((offset + sg_len) > 0x10000)
2631 len = 0x10000 - offset;
2633 ap->prd[idx].addr = cpu_to_le32(addr);
2634 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2635 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2644 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2647 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2648 * @qc: Metadata associated with taskfile to check
2650 * Allow low-level driver to filter ATA PACKET commands, returning
2651 * a status indicating whether or not it is OK to use DMA for the
2652 * supplied PACKET command.
2655 * spin_lock_irqsave(host_set lock)
2657 * RETURNS: 0 when ATAPI DMA can be used
2660 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2662 struct ata_port *ap = qc->ap;
2663 int rc = 0; /* Assume ATAPI DMA is OK by default */
2665 if (ap->ops->check_atapi_dma)
2666 rc = ap->ops->check_atapi_dma(qc);
2671 * ata_qc_prep - Prepare taskfile for submission
2672 * @qc: Metadata associated with taskfile to be prepared
2674 * Prepare ATA taskfile for submission.
2677 * spin_lock_irqsave(host_set lock)
2679 void ata_qc_prep(struct ata_queued_cmd *qc)
2681 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2688 * ata_sg_init_one - Associate command with memory buffer
2689 * @qc: Command to be associated
2690 * @buf: Memory buffer
2691 * @buflen: Length of memory buffer, in bytes.
2693 * Initialize the data-related elements of queued_cmd @qc
2694 * to point to a single memory buffer, @buf of byte length @buflen.
2697 * spin_lock_irqsave(host_set lock)
2700 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2702 struct scatterlist *sg;
2704 qc->flags |= ATA_QCFLAG_SINGLE;
2706 memset(&qc->sgent, 0, sizeof(qc->sgent));
2707 qc->__sg = &qc->sgent;
2709 qc->orig_n_elem = 1;
2713 sg_init_one(sg, buf, buflen);
2717 * ata_sg_init - Associate command with scatter-gather table.
2718 * @qc: Command to be associated
2719 * @sg: Scatter-gather table.
2720 * @n_elem: Number of elements in s/g table.
2722 * Initialize the data-related elements of queued_cmd @qc
2723 * to point to a scatter-gather table @sg, containing @n_elem
2727 * spin_lock_irqsave(host_set lock)
2730 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2731 unsigned int n_elem)
2733 qc->flags |= ATA_QCFLAG_SG;
2735 qc->n_elem = n_elem;
2736 qc->orig_n_elem = n_elem;
2740 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2741 * @qc: Command with memory buffer to be mapped.
2743 * DMA-map the memory buffer associated with queued_cmd @qc.
2746 * spin_lock_irqsave(host_set lock)
2749 * Zero on success, negative on error.
2752 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2754 struct ata_port *ap = qc->ap;
2755 int dir = qc->dma_dir;
2756 struct scatterlist *sg = qc->__sg;
2757 dma_addr_t dma_address;
2759 /* we must lengthen transfers to end on a 32-bit boundary */
2760 qc->pad_len = sg->length & 3;
2762 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2763 struct scatterlist *psg = &qc->pad_sgent;
2765 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2767 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2769 if (qc->tf.flags & ATA_TFLAG_WRITE)
2770 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2773 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2774 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2776 sg->length -= qc->pad_len;
2778 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2779 sg->length, qc->pad_len);
2783 sg_dma_address(sg) = 0;
2787 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2789 if (dma_mapping_error(dma_address)) {
2791 sg->length += qc->pad_len;
2795 sg_dma_address(sg) = dma_address;
2797 sg_dma_len(sg) = sg->length;
2799 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2800 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2806 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2807 * @qc: Command with scatter-gather table to be mapped.
2809 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2812 * spin_lock_irqsave(host_set lock)
2815 * Zero on success, negative on error.
2819 static int ata_sg_setup(struct ata_queued_cmd *qc)
2821 struct ata_port *ap = qc->ap;
2822 struct scatterlist *sg = qc->__sg;
2823 struct scatterlist *lsg = &sg[qc->n_elem - 1];
2824 int n_elem, pre_n_elem, dir, trim_sg = 0;
2826 VPRINTK("ENTER, ata%u\n", ap->id);
2827 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
2829 /* we must lengthen transfers to end on a 32-bit boundary */
2830 qc->pad_len = lsg->length & 3;
2832 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2833 struct scatterlist *psg = &qc->pad_sgent;
2834 unsigned int offset;
2836 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2838 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2841 * psg->page/offset are used to copy to-be-written
2842 * data in this function or read data in ata_sg_clean.
2844 offset = lsg->offset + lsg->length - qc->pad_len;
2845 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
2846 psg->offset = offset_in_page(offset);
2848 if (qc->tf.flags & ATA_TFLAG_WRITE) {
2849 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2850 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
2851 kunmap_atomic(addr, KM_IRQ0);
2854 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2855 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2857 lsg->length -= qc->pad_len;
2858 if (lsg->length == 0)
2861 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2862 qc->n_elem - 1, lsg->length, qc->pad_len);
2865 pre_n_elem = qc->n_elem;
2866 if (trim_sg && pre_n_elem)
2875 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
2877 /* restore last sg */
2878 lsg->length += qc->pad_len;
2882 DPRINTK("%d sg elements mapped\n", n_elem);
2885 qc->n_elem = n_elem;
2891 * ata_poll_qc_complete - turn irq back on and finish qc
2892 * @qc: Command to complete
2893 * @err_mask: ATA status register content
2896 * None. (grabs host lock)
2899 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
2901 struct ata_port *ap = qc->ap;
2902 unsigned long flags;
2904 spin_lock_irqsave(&ap->host_set->lock, flags);
2905 ap->flags &= ~ATA_FLAG_NOINTR;
2907 ata_qc_complete(qc);
2908 spin_unlock_irqrestore(&ap->host_set->lock, flags);
2912 * ata_pio_poll - poll using PIO, depending on current state
2913 * @ap: the target ata_port
2916 * None. (executing in kernel thread context)
2919 * timeout value to use
2922 static unsigned long ata_pio_poll(struct ata_port *ap)
2924 struct ata_queued_cmd *qc;
2926 unsigned int poll_state = HSM_ST_UNKNOWN;
2927 unsigned int reg_state = HSM_ST_UNKNOWN;
2929 qc = ata_qc_from_tag(ap, ap->active_tag);
2930 WARN_ON(qc == NULL);
2932 switch (ap->hsm_task_state) {
2935 poll_state = HSM_ST_POLL;
2939 case HSM_ST_LAST_POLL:
2940 poll_state = HSM_ST_LAST_POLL;
2941 reg_state = HSM_ST_LAST;
2948 status = ata_chk_status(ap);
2949 if (status & ATA_BUSY) {
2950 if (time_after(jiffies, ap->pio_task_timeout)) {
2951 qc->err_mask |= AC_ERR_TIMEOUT;
2952 ap->hsm_task_state = HSM_ST_TMOUT;
2955 ap->hsm_task_state = poll_state;
2956 return ATA_SHORT_PAUSE;
2959 ap->hsm_task_state = reg_state;
2964 * ata_pio_complete - check if drive is busy or idle
2965 * @ap: the target ata_port
2968 * None. (executing in kernel thread context)
2971 * Non-zero if qc completed, zero otherwise.
2974 static int ata_pio_complete (struct ata_port *ap)
2976 struct ata_queued_cmd *qc;
2980 * This is purely heuristic. This is a fast path. Sometimes when
2981 * we enter, BSY will be cleared in a chk-status or two. If not,
2982 * the drive is probably seeking or something. Snooze for a couple
2983 * msecs, then chk-status again. If still busy, fall back to
2984 * HSM_ST_POLL state.
2986 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
2987 if (drv_stat & ATA_BUSY) {
2989 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
2990 if (drv_stat & ATA_BUSY) {
2991 ap->hsm_task_state = HSM_ST_LAST_POLL;
2992 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
2997 qc = ata_qc_from_tag(ap, ap->active_tag);
2998 WARN_ON(qc == NULL);
3000 drv_stat = ata_wait_idle(ap);
3001 if (!ata_ok(drv_stat)) {
3002 qc->err_mask |= __ac_err_mask(drv_stat);
3003 ap->hsm_task_state = HSM_ST_ERR;
3007 ap->hsm_task_state = HSM_ST_IDLE;
3009 WARN_ON(qc->err_mask);
3010 ata_poll_qc_complete(qc);
3012 /* another command may start at this point */
3019 * swap_buf_le16 - swap halves of 16-bit words in place
3020 * @buf: Buffer to swap
3021 * @buf_words: Number of 16-bit words in buffer.
3023 * Swap halves of 16-bit words if needed to convert from
3024 * little-endian byte order to native cpu byte order, or
3028 * Inherited from caller.
3030 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3035 for (i = 0; i < buf_words; i++)
3036 buf[i] = le16_to_cpu(buf[i]);
3037 #endif /* __BIG_ENDIAN */
3041 * ata_mmio_data_xfer - Transfer data by MMIO
3042 * @ap: port to read/write
3044 * @buflen: buffer length
3045 * @write_data: read/write
3047 * Transfer data from/to the device data register by MMIO.
3050 * Inherited from caller.
3053 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3054 unsigned int buflen, int write_data)
3057 unsigned int words = buflen >> 1;
3058 u16 *buf16 = (u16 *) buf;
3059 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3061 /* Transfer multiple of 2 bytes */
3063 for (i = 0; i < words; i++)
3064 writew(le16_to_cpu(buf16[i]), mmio);
3066 for (i = 0; i < words; i++)
3067 buf16[i] = cpu_to_le16(readw(mmio));
3070 /* Transfer trailing 1 byte, if any. */
3071 if (unlikely(buflen & 0x01)) {
3072 u16 align_buf[1] = { 0 };
3073 unsigned char *trailing_buf = buf + buflen - 1;
3076 memcpy(align_buf, trailing_buf, 1);
3077 writew(le16_to_cpu(align_buf[0]), mmio);
3079 align_buf[0] = cpu_to_le16(readw(mmio));
3080 memcpy(trailing_buf, align_buf, 1);
3086 * ata_pio_data_xfer - Transfer data by PIO
3087 * @ap: port to read/write
3089 * @buflen: buffer length
3090 * @write_data: read/write
3092 * Transfer data from/to the device data register by PIO.
3095 * Inherited from caller.
3098 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3099 unsigned int buflen, int write_data)
3101 unsigned int words = buflen >> 1;
3103 /* Transfer multiple of 2 bytes */
3105 outsw(ap->ioaddr.data_addr, buf, words);
3107 insw(ap->ioaddr.data_addr, buf, words);
3109 /* Transfer trailing 1 byte, if any. */
3110 if (unlikely(buflen & 0x01)) {
3111 u16 align_buf[1] = { 0 };
3112 unsigned char *trailing_buf = buf + buflen - 1;
3115 memcpy(align_buf, trailing_buf, 1);
3116 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3118 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3119 memcpy(trailing_buf, align_buf, 1);
3125 * ata_data_xfer - Transfer data from/to the data register.
3126 * @ap: port to read/write
3128 * @buflen: buffer length
3129 * @do_write: read/write
3131 * Transfer data from/to the device data register.
3134 * Inherited from caller.
3137 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3138 unsigned int buflen, int do_write)
3140 /* Make the crap hardware pay the costs not the good stuff */
3141 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3142 unsigned long flags;
3143 local_irq_save(flags);
3144 if (ap->flags & ATA_FLAG_MMIO)
3145 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3147 ata_pio_data_xfer(ap, buf, buflen, do_write);
3148 local_irq_restore(flags);
3150 if (ap->flags & ATA_FLAG_MMIO)
3151 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3153 ata_pio_data_xfer(ap, buf, buflen, do_write);
3158 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3159 * @qc: Command on going
3161 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3164 * Inherited from caller.
3167 static void ata_pio_sector(struct ata_queued_cmd *qc)
3169 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3170 struct scatterlist *sg = qc->__sg;
3171 struct ata_port *ap = qc->ap;
3173 unsigned int offset;
3176 if (qc->cursect == (qc->nsect - 1))
3177 ap->hsm_task_state = HSM_ST_LAST;
3179 page = sg[qc->cursg].page;
3180 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3182 /* get the current page and offset */
3183 page = nth_page(page, (offset >> PAGE_SHIFT));
3184 offset %= PAGE_SIZE;
3186 buf = kmap(page) + offset;
3191 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3196 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3198 /* do the actual data transfer */
3199 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3200 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3206 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3207 * @qc: Command on going
3208 * @bytes: number of bytes
3210 * Transfer Transfer data from/to the ATAPI device.
3213 * Inherited from caller.
3217 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3219 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3220 struct scatterlist *sg = qc->__sg;
3221 struct ata_port *ap = qc->ap;
3224 unsigned int offset, count;
3226 if (qc->curbytes + bytes >= qc->nbytes)
3227 ap->hsm_task_state = HSM_ST_LAST;
3230 if (unlikely(qc->cursg >= qc->n_elem)) {
3232 * The end of qc->sg is reached and the device expects
3233 * more data to transfer. In order not to overrun qc->sg
3234 * and fulfill length specified in the byte count register,
3235 * - for read case, discard trailing data from the device
3236 * - for write case, padding zero data to the device
3238 u16 pad_buf[1] = { 0 };
3239 unsigned int words = bytes >> 1;
3242 if (words) /* warning if bytes > 1 */
3243 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3246 for (i = 0; i < words; i++)
3247 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3249 ap->hsm_task_state = HSM_ST_LAST;
3253 sg = &qc->__sg[qc->cursg];
3256 offset = sg->offset + qc->cursg_ofs;
3258 /* get the current page and offset */
3259 page = nth_page(page, (offset >> PAGE_SHIFT));
3260 offset %= PAGE_SIZE;
3262 /* don't overrun current sg */
3263 count = min(sg->length - qc->cursg_ofs, bytes);
3265 /* don't cross page boundaries */
3266 count = min(count, (unsigned int)PAGE_SIZE - offset);
3268 buf = kmap(page) + offset;
3271 qc->curbytes += count;
3272 qc->cursg_ofs += count;
3274 if (qc->cursg_ofs == sg->length) {
3279 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3281 /* do the actual data transfer */
3282 ata_data_xfer(ap, buf, count, do_write);
3291 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3292 * @qc: Command on going
3294 * Transfer Transfer data from/to the ATAPI device.
3297 * Inherited from caller.
3300 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3302 struct ata_port *ap = qc->ap;
3303 struct ata_device *dev = qc->dev;
3304 unsigned int ireason, bc_lo, bc_hi, bytes;
3305 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3307 ap->ops->tf_read(ap, &qc->tf);
3308 ireason = qc->tf.nsect;
3309 bc_lo = qc->tf.lbam;
3310 bc_hi = qc->tf.lbah;
3311 bytes = (bc_hi << 8) | bc_lo;
3313 /* shall be cleared to zero, indicating xfer of data */
3314 if (ireason & (1 << 0))
3317 /* make sure transfer direction matches expected */
3318 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3319 if (do_write != i_write)
3322 __atapi_pio_bytes(qc, bytes);
3327 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3328 ap->id, dev->devno);
3329 qc->err_mask |= AC_ERR_HSM;
3330 ap->hsm_task_state = HSM_ST_ERR;
3334 * ata_pio_block - start PIO on a block
3335 * @ap: the target ata_port
3338 * None. (executing in kernel thread context)
3341 static void ata_pio_block(struct ata_port *ap)
3343 struct ata_queued_cmd *qc;
3347 * This is purely heuristic. This is a fast path.
3348 * Sometimes when we enter, BSY will be cleared in
3349 * a chk-status or two. If not, the drive is probably seeking
3350 * or something. Snooze for a couple msecs, then
3351 * chk-status again. If still busy, fall back to
3352 * HSM_ST_POLL state.
3354 status = ata_busy_wait(ap, ATA_BUSY, 5);
3355 if (status & ATA_BUSY) {
3357 status = ata_busy_wait(ap, ATA_BUSY, 10);
3358 if (status & ATA_BUSY) {
3359 ap->hsm_task_state = HSM_ST_POLL;
3360 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3365 qc = ata_qc_from_tag(ap, ap->active_tag);
3366 WARN_ON(qc == NULL);
3369 if (status & (ATA_ERR | ATA_DF)) {
3370 qc->err_mask |= AC_ERR_DEV;
3371 ap->hsm_task_state = HSM_ST_ERR;
3375 /* transfer data if any */
3376 if (is_atapi_taskfile(&qc->tf)) {
3377 /* DRQ=0 means no more data to transfer */
3378 if ((status & ATA_DRQ) == 0) {
3379 ap->hsm_task_state = HSM_ST_LAST;
3383 atapi_pio_bytes(qc);
3385 /* handle BSY=0, DRQ=0 as error */
3386 if ((status & ATA_DRQ) == 0) {
3387 qc->err_mask |= AC_ERR_HSM;
3388 ap->hsm_task_state = HSM_ST_ERR;
3396 static void ata_pio_error(struct ata_port *ap)
3398 struct ata_queued_cmd *qc;
3400 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
3402 qc = ata_qc_from_tag(ap, ap->active_tag);
3403 WARN_ON(qc == NULL);
3405 /* make sure qc->err_mask is available to
3406 * know what's wrong and recover
3408 WARN_ON(qc->err_mask == 0);
3410 ap->hsm_task_state = HSM_ST_IDLE;
3412 ata_poll_qc_complete(qc);
3415 static void ata_pio_task(void *_data)
3417 struct ata_port *ap = _data;
3418 unsigned long timeout;
3425 switch (ap->hsm_task_state) {
3434 qc_completed = ata_pio_complete(ap);
3438 case HSM_ST_LAST_POLL:
3439 timeout = ata_pio_poll(ap);
3449 ata_queue_delayed_pio_task(ap, timeout);
3450 else if (!qc_completed)
3455 * ata_qc_timeout - Handle timeout of queued command
3456 * @qc: Command that timed out
3458 * Some part of the kernel (currently, only the SCSI layer)
3459 * has noticed that the active command on port @ap has not
3460 * completed after a specified length of time. Handle this
3461 * condition by disabling DMA (if necessary) and completing
3462 * transactions, with error if necessary.
3464 * This also handles the case of the "lost interrupt", where
3465 * for some reason (possibly hardware bug, possibly driver bug)
3466 * an interrupt was not delivered to the driver, even though the
3467 * transaction completed successfully.
3470 * Inherited from SCSI layer (none, can sleep)
3473 static void ata_qc_timeout(struct ata_queued_cmd *qc)
3475 struct ata_port *ap = qc->ap;
3476 struct ata_host_set *host_set = ap->host_set;
3477 u8 host_stat = 0, drv_stat;
3478 unsigned long flags;
3482 ata_flush_pio_tasks(ap);
3483 ap->hsm_task_state = HSM_ST_IDLE;
3485 spin_lock_irqsave(&host_set->lock, flags);
3487 switch (qc->tf.protocol) {
3490 case ATA_PROT_ATAPI_DMA:
3491 host_stat = ap->ops->bmdma_status(ap);
3493 /* before we do anything else, clear DMA-Start bit */
3494 ap->ops->bmdma_stop(qc);
3500 drv_stat = ata_chk_status(ap);
3502 /* ack bmdma irq events */
3503 ap->ops->irq_clear(ap);
3505 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3506 ap->id, qc->tf.command, drv_stat, host_stat);
3508 /* complete taskfile transaction */
3509 qc->err_mask |= ac_err_mask(drv_stat);
3513 spin_unlock_irqrestore(&host_set->lock, flags);
3515 ata_eh_qc_complete(qc);
3521 * ata_eng_timeout - Handle timeout of queued command
3522 * @ap: Port on which timed-out command is active
3524 * Some part of the kernel (currently, only the SCSI layer)
3525 * has noticed that the active command on port @ap has not
3526 * completed after a specified length of time. Handle this
3527 * condition by disabling DMA (if necessary) and completing
3528 * transactions, with error if necessary.
3530 * This also handles the case of the "lost interrupt", where
3531 * for some reason (possibly hardware bug, possibly driver bug)
3532 * an interrupt was not delivered to the driver, even though the
3533 * transaction completed successfully.
3536 * Inherited from SCSI layer (none, can sleep)
3539 void ata_eng_timeout(struct ata_port *ap)
3543 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
3549 * ata_qc_new - Request an available ATA command, for queueing
3550 * @ap: Port associated with device @dev
3551 * @dev: Device from whom we request an available command structure
3557 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3559 struct ata_queued_cmd *qc = NULL;
3562 for (i = 0; i < ATA_MAX_QUEUE; i++)
3563 if (!test_and_set_bit(i, &ap->qactive)) {
3564 qc = ata_qc_from_tag(ap, i);
3575 * ata_qc_new_init - Request an available ATA command, and initialize it
3576 * @ap: Port associated with device @dev
3577 * @dev: Device from whom we request an available command structure
3583 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3584 struct ata_device *dev)
3586 struct ata_queued_cmd *qc;
3588 qc = ata_qc_new(ap);
3601 * ata_qc_free - free unused ata_queued_cmd
3602 * @qc: Command to complete
3604 * Designed to free unused ata_queued_cmd object
3605 * in case something prevents using it.
3608 * spin_lock_irqsave(host_set lock)
3610 void ata_qc_free(struct ata_queued_cmd *qc)
3612 struct ata_port *ap = qc->ap;
3615 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3619 if (likely(ata_tag_valid(tag))) {
3620 if (tag == ap->active_tag)
3621 ap->active_tag = ATA_TAG_POISON;
3622 qc->tag = ATA_TAG_POISON;
3623 clear_bit(tag, &ap->qactive);
3627 void __ata_qc_complete(struct ata_queued_cmd *qc)
3629 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
3630 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
3632 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3635 /* atapi: mark qc as inactive to prevent the interrupt handler
3636 * from completing the command twice later, before the error handler
3637 * is called. (when rc != 0 and atapi request sense is needed)
3639 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3641 /* call completion callback */
3642 qc->complete_fn(qc);
3645 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3647 struct ata_port *ap = qc->ap;
3649 switch (qc->tf.protocol) {
3651 case ATA_PROT_ATAPI_DMA:
3654 case ATA_PROT_ATAPI:
3656 case ATA_PROT_PIO_MULT:
3657 if (ap->flags & ATA_FLAG_PIO_DMA)
3670 * ata_qc_issue - issue taskfile to device
3671 * @qc: command to issue to device
3673 * Prepare an ATA command to submission to device.
3674 * This includes mapping the data into a DMA-able
3675 * area, filling in the S/G table, and finally
3676 * writing the taskfile to hardware, starting the command.
3679 * spin_lock_irqsave(host_set lock)
3682 * Zero on success, AC_ERR_* mask on failure
3685 unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
3687 struct ata_port *ap = qc->ap;
3689 if (ata_should_dma_map(qc)) {
3690 if (qc->flags & ATA_QCFLAG_SG) {
3691 if (ata_sg_setup(qc))
3693 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3694 if (ata_sg_setup_one(qc))
3698 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3701 ap->ops->qc_prep(qc);
3703 qc->ap->active_tag = qc->tag;
3704 qc->flags |= ATA_QCFLAG_ACTIVE;
3706 return ap->ops->qc_issue(qc);
3709 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3710 return AC_ERR_SYSTEM;
3715 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3716 * @qc: command to issue to device
3718 * Using various libata functions and hooks, this function
3719 * starts an ATA command. ATA commands are grouped into
3720 * classes called "protocols", and issuing each type of protocol
3721 * is slightly different.
3723 * May be used as the qc_issue() entry in ata_port_operations.
3726 * spin_lock_irqsave(host_set lock)
3729 * Zero on success, AC_ERR_* mask on failure
3732 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
3734 struct ata_port *ap = qc->ap;
3736 ata_dev_select(ap, qc->dev->devno, 1, 0);
3738 switch (qc->tf.protocol) {
3739 case ATA_PROT_NODATA:
3740 ata_tf_to_host(ap, &qc->tf);
3744 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3745 ap->ops->bmdma_setup(qc); /* set up bmdma */
3746 ap->ops->bmdma_start(qc); /* initiate bmdma */
3749 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
3750 ata_qc_set_polling(qc);
3751 ata_tf_to_host(ap, &qc->tf);
3752 ap->hsm_task_state = HSM_ST;
3753 ata_queue_pio_task(ap);
3756 case ATA_PROT_ATAPI:
3757 ata_qc_set_polling(qc);
3758 ata_tf_to_host(ap, &qc->tf);
3759 ata_queue_packet_task(ap);
3762 case ATA_PROT_ATAPI_NODATA:
3763 ap->flags |= ATA_FLAG_NOINTR;
3764 ata_tf_to_host(ap, &qc->tf);
3765 ata_queue_packet_task(ap);
3768 case ATA_PROT_ATAPI_DMA:
3769 ap->flags |= ATA_FLAG_NOINTR;
3770 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3771 ap->ops->bmdma_setup(qc); /* set up bmdma */
3772 ata_queue_packet_task(ap);
3777 return AC_ERR_SYSTEM;
3784 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3785 * @qc: Info associated with this ATA transaction.
3788 * spin_lock_irqsave(host_set lock)
3791 static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
3793 struct ata_port *ap = qc->ap;
3794 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3796 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3798 /* load PRD table addr. */
3799 mb(); /* make sure PRD table writes are visible to controller */
3800 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
3802 /* specify data direction, triple-check start bit is clear */
3803 dmactl = readb(mmio + ATA_DMA_CMD);
3804 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3806 dmactl |= ATA_DMA_WR;
3807 writeb(dmactl, mmio + ATA_DMA_CMD);
3809 /* issue r/w command */
3810 ap->ops->exec_command(ap, &qc->tf);
3814 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3815 * @qc: Info associated with this ATA transaction.
3818 * spin_lock_irqsave(host_set lock)
3821 static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
3823 struct ata_port *ap = qc->ap;
3824 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3827 /* start host DMA transaction */
3828 dmactl = readb(mmio + ATA_DMA_CMD);
3829 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
3831 /* Strictly, one may wish to issue a readb() here, to
3832 * flush the mmio write. However, control also passes
3833 * to the hardware at this point, and it will interrupt
3834 * us when we are to resume control. So, in effect,
3835 * we don't care when the mmio write flushes.
3836 * Further, a read of the DMA status register _immediately_
3837 * following the write may not be what certain flaky hardware
3838 * is expected, so I think it is best to not add a readb()
3839 * without first all the MMIO ATA cards/mobos.
3840 * Or maybe I'm just being paranoid.
3845 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3846 * @qc: Info associated with this ATA transaction.
3849 * spin_lock_irqsave(host_set lock)
3852 static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
3854 struct ata_port *ap = qc->ap;
3855 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3858 /* load PRD table addr. */
3859 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
3861 /* specify data direction, triple-check start bit is clear */
3862 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3863 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3865 dmactl |= ATA_DMA_WR;
3866 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3868 /* issue r/w command */
3869 ap->ops->exec_command(ap, &qc->tf);
3873 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3874 * @qc: Info associated with this ATA transaction.
3877 * spin_lock_irqsave(host_set lock)
3880 static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
3882 struct ata_port *ap = qc->ap;
3885 /* start host DMA transaction */
3886 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3887 outb(dmactl | ATA_DMA_START,
3888 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3893 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3894 * @qc: Info associated with this ATA transaction.
3896 * Writes the ATA_DMA_START flag to the DMA command register.
3898 * May be used as the bmdma_start() entry in ata_port_operations.
3901 * spin_lock_irqsave(host_set lock)
3903 void ata_bmdma_start(struct ata_queued_cmd *qc)
3905 if (qc->ap->flags & ATA_FLAG_MMIO)
3906 ata_bmdma_start_mmio(qc);
3908 ata_bmdma_start_pio(qc);
3913 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3914 * @qc: Info associated with this ATA transaction.
3916 * Writes address of PRD table to device's PRD Table Address
3917 * register, sets the DMA control register, and calls
3918 * ops->exec_command() to start the transfer.
3920 * May be used as the bmdma_setup() entry in ata_port_operations.
3923 * spin_lock_irqsave(host_set lock)
3925 void ata_bmdma_setup(struct ata_queued_cmd *qc)
3927 if (qc->ap->flags & ATA_FLAG_MMIO)
3928 ata_bmdma_setup_mmio(qc);
3930 ata_bmdma_setup_pio(qc);
3935 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3936 * @ap: Port associated with this ATA transaction.
3938 * Clear interrupt and error flags in DMA status register.
3940 * May be used as the irq_clear() entry in ata_port_operations.
3943 * spin_lock_irqsave(host_set lock)
3946 void ata_bmdma_irq_clear(struct ata_port *ap)
3948 if (ap->flags & ATA_FLAG_MMIO) {
3949 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
3950 writeb(readb(mmio), mmio);
3952 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
3953 outb(inb(addr), addr);
3960 * ata_bmdma_status - Read PCI IDE BMDMA status
3961 * @ap: Port associated with this ATA transaction.
3963 * Read and return BMDMA status register.
3965 * May be used as the bmdma_status() entry in ata_port_operations.
3968 * spin_lock_irqsave(host_set lock)
3971 u8 ata_bmdma_status(struct ata_port *ap)
3974 if (ap->flags & ATA_FLAG_MMIO) {
3975 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3976 host_stat = readb(mmio + ATA_DMA_STATUS);
3978 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
3984 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3985 * @qc: Command we are ending DMA for
3987 * Clears the ATA_DMA_START flag in the dma control register
3989 * May be used as the bmdma_stop() entry in ata_port_operations.
3992 * spin_lock_irqsave(host_set lock)
3995 void ata_bmdma_stop(struct ata_queued_cmd *qc)
3997 struct ata_port *ap = qc->ap;
3998 if (ap->flags & ATA_FLAG_MMIO) {
3999 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4001 /* clear start/stop bit */
4002 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4003 mmio + ATA_DMA_CMD);
4005 /* clear start/stop bit */
4006 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4007 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4010 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4011 ata_altstatus(ap); /* dummy read */
4015 * ata_host_intr - Handle host interrupt for given (port, task)
4016 * @ap: Port on which interrupt arrived (possibly...)
4017 * @qc: Taskfile currently active in engine
4019 * Handle host interrupt for given queued command. Currently,
4020 * only DMA interrupts are handled. All other commands are
4021 * handled via polling with interrupts disabled (nIEN bit).
4024 * spin_lock_irqsave(host_set lock)
4027 * One if interrupt was handled, zero if not (shared irq).
4030 inline unsigned int ata_host_intr (struct ata_port *ap,
4031 struct ata_queued_cmd *qc)
4033 u8 status, host_stat;
4035 switch (qc->tf.protocol) {
4038 case ATA_PROT_ATAPI_DMA:
4039 case ATA_PROT_ATAPI:
4040 /* check status of DMA engine */
4041 host_stat = ap->ops->bmdma_status(ap);
4042 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4044 /* if it's not our irq... */
4045 if (!(host_stat & ATA_DMA_INTR))
4048 /* before we do anything else, clear DMA-Start bit */
4049 ap->ops->bmdma_stop(qc);
4053 case ATA_PROT_ATAPI_NODATA:
4054 case ATA_PROT_NODATA:
4055 /* check altstatus */
4056 status = ata_altstatus(ap);
4057 if (status & ATA_BUSY)
4060 /* check main status, clearing INTRQ */
4061 status = ata_chk_status(ap);
4062 if (unlikely(status & ATA_BUSY))
4064 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4065 ap->id, qc->tf.protocol, status);
4067 /* ack bmdma irq events */
4068 ap->ops->irq_clear(ap);
4070 /* complete taskfile transaction */
4071 qc->err_mask |= ac_err_mask(status);
4072 ata_qc_complete(qc);
4079 return 1; /* irq handled */
4082 ap->stats.idle_irq++;
4085 if ((ap->stats.idle_irq % 1000) == 0) {
4087 ata_irq_ack(ap, 0); /* debug trap */
4088 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4091 return 0; /* irq not handled */
4095 * ata_interrupt - Default ATA host interrupt handler
4096 * @irq: irq line (unused)
4097 * @dev_instance: pointer to our ata_host_set information structure
4100 * Default interrupt handler for PCI IDE devices. Calls
4101 * ata_host_intr() for each port that is not disabled.
4104 * Obtains host_set lock during operation.
4107 * IRQ_NONE or IRQ_HANDLED.
4110 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4112 struct ata_host_set *host_set = dev_instance;
4114 unsigned int handled = 0;
4115 unsigned long flags;
4117 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4118 spin_lock_irqsave(&host_set->lock, flags);
4120 for (i = 0; i < host_set->n_ports; i++) {
4121 struct ata_port *ap;
4123 ap = host_set->ports[i];
4125 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
4126 struct ata_queued_cmd *qc;
4128 qc = ata_qc_from_tag(ap, ap->active_tag);
4129 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4130 (qc->flags & ATA_QCFLAG_ACTIVE))
4131 handled |= ata_host_intr(ap, qc);
4135 spin_unlock_irqrestore(&host_set->lock, flags);
4137 return IRQ_RETVAL(handled);
4141 * atapi_packet_task - Write CDB bytes to hardware
4142 * @_data: Port to which ATAPI device is attached.
4144 * When device has indicated its readiness to accept
4145 * a CDB, this function is called. Send the CDB.
4146 * If DMA is to be performed, exit immediately.
4147 * Otherwise, we are in polling mode, so poll
4148 * status under operation succeeds or fails.
4151 * Kernel thread context (may sleep)
4154 static void atapi_packet_task(void *_data)
4156 struct ata_port *ap = _data;
4157 struct ata_queued_cmd *qc;
4160 qc = ata_qc_from_tag(ap, ap->active_tag);
4161 WARN_ON(qc == NULL);
4162 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4164 /* sleep-wait for BSY to clear */
4165 DPRINTK("busy wait\n");
4166 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4167 qc->err_mask |= AC_ERR_TIMEOUT;
4171 /* make sure DRQ is set */
4172 status = ata_chk_status(ap);
4173 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4174 qc->err_mask |= AC_ERR_HSM;
4179 DPRINTK("send cdb\n");
4180 WARN_ON(ap->cdb_len < 12);
4182 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4183 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4184 unsigned long flags;
4186 /* Once we're done issuing command and kicking bmdma,
4187 * irq handler takes over. To not lose irq, we need
4188 * to clear NOINTR flag before sending cdb, but
4189 * interrupt handler shouldn't be invoked before we're
4190 * finished. Hence, the following locking.
4192 spin_lock_irqsave(&ap->host_set->lock, flags);
4193 ap->flags &= ~ATA_FLAG_NOINTR;
4194 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4195 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4196 ap->ops->bmdma_start(qc); /* initiate bmdma */
4197 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4199 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4201 /* PIO commands are handled by polling */
4202 ap->hsm_task_state = HSM_ST;
4203 ata_queue_pio_task(ap);
4209 ata_poll_qc_complete(qc);
4214 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4215 * without filling any other registers
4217 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4220 struct ata_taskfile tf;
4223 ata_tf_init(ap, &tf, dev->devno);
4226 tf.flags |= ATA_TFLAG_DEVICE;
4227 tf.protocol = ATA_PROT_NODATA;
4229 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4231 printk(KERN_ERR "%s: ata command failed: %d\n",
4237 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4241 if (!ata_try_flush_cache(dev))
4244 if (ata_id_has_flush_ext(dev->id))
4245 cmd = ATA_CMD_FLUSH_EXT;
4247 cmd = ATA_CMD_FLUSH;
4249 return ata_do_simple_cmd(ap, dev, cmd);
4252 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4254 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4257 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4259 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4263 * ata_device_resume - wakeup a previously suspended devices
4264 * @ap: port the device is connected to
4265 * @dev: the device to resume
4267 * Kick the drive back into action, by sending it an idle immediate
4268 * command and making sure its transfer mode matches between drive
4272 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4274 if (ap->flags & ATA_FLAG_SUSPENDED) {
4275 ap->flags &= ~ATA_FLAG_SUSPENDED;
4278 if (!ata_dev_present(dev))
4280 if (dev->class == ATA_DEV_ATA)
4281 ata_start_drive(ap, dev);
4287 * ata_device_suspend - prepare a device for suspend
4288 * @ap: port the device is connected to
4289 * @dev: the device to suspend
4291 * Flush the cache on the drive, if appropriate, then issue a
4292 * standbynow command.
4294 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4296 if (!ata_dev_present(dev))
4298 if (dev->class == ATA_DEV_ATA)
4299 ata_flush_cache(ap, dev);
4301 ata_standby_drive(ap, dev);
4302 ap->flags |= ATA_FLAG_SUSPENDED;
4307 * ata_port_start - Set port up for dma.
4308 * @ap: Port to initialize
4310 * Called just after data structures for each port are
4311 * initialized. Allocates space for PRD table.
4313 * May be used as the port_start() entry in ata_port_operations.
4316 * Inherited from caller.
4319 int ata_port_start (struct ata_port *ap)
4321 struct device *dev = ap->host_set->dev;
4324 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4328 rc = ata_pad_alloc(ap, dev);
4330 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4334 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4341 * ata_port_stop - Undo ata_port_start()
4342 * @ap: Port to shut down
4344 * Frees the PRD table.
4346 * May be used as the port_stop() entry in ata_port_operations.
4349 * Inherited from caller.
4352 void ata_port_stop (struct ata_port *ap)
4354 struct device *dev = ap->host_set->dev;
4356 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4357 ata_pad_free(ap, dev);
4360 void ata_host_stop (struct ata_host_set *host_set)
4362 if (host_set->mmio_base)
4363 iounmap(host_set->mmio_base);
4368 * ata_host_remove - Unregister SCSI host structure with upper layers
4369 * @ap: Port to unregister
4370 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4373 * Inherited from caller.
4376 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4378 struct Scsi_Host *sh = ap->host;
4383 scsi_remove_host(sh);
4385 ap->ops->port_stop(ap);
4389 * ata_host_init - Initialize an ata_port structure
4390 * @ap: Structure to initialize
4391 * @host: associated SCSI mid-layer structure
4392 * @host_set: Collection of hosts to which @ap belongs
4393 * @ent: Probe information provided by low-level driver
4394 * @port_no: Port number associated with this ata_port
4396 * Initialize a new ata_port structure, and its associated
4400 * Inherited from caller.
4403 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4404 struct ata_host_set *host_set,
4405 const struct ata_probe_ent *ent, unsigned int port_no)
4411 host->max_channel = 1;
4412 host->unique_id = ata_unique_id++;
4413 host->max_cmd_len = 12;
4415 ap->flags = ATA_FLAG_PORT_DISABLED;
4416 ap->id = host->unique_id;
4418 ap->ctl = ATA_DEVCTL_OBS;
4419 ap->host_set = host_set;
4420 ap->port_no = port_no;
4422 ent->legacy_mode ? ent->hard_port_no : port_no;
4423 ap->pio_mask = ent->pio_mask;
4424 ap->mwdma_mask = ent->mwdma_mask;
4425 ap->udma_mask = ent->udma_mask;
4426 ap->flags |= ent->host_flags;
4427 ap->ops = ent->port_ops;
4428 ap->cbl = ATA_CBL_NONE;
4429 ap->active_tag = ATA_TAG_POISON;
4430 ap->last_ctl = 0xFF;
4432 INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
4433 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4434 INIT_LIST_HEAD(&ap->eh_done_q);
4436 for (i = 0; i < ATA_MAX_DEVICES; i++)
4437 ap->device[i].devno = i;
4440 ap->stats.unhandled_irq = 1;
4441 ap->stats.idle_irq = 1;
4444 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4448 * ata_host_add - Attach low-level ATA driver to system
4449 * @ent: Information provided by low-level driver
4450 * @host_set: Collections of ports to which we add
4451 * @port_no: Port number associated with this host
4453 * Attach low-level ATA driver to system.
4456 * PCI/etc. bus probe sem.
4459 * New ata_port on success, for NULL on error.
4462 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4463 struct ata_host_set *host_set,
4464 unsigned int port_no)
4466 struct Scsi_Host *host;
4467 struct ata_port *ap;
4471 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4475 ap = (struct ata_port *) &host->hostdata[0];
4477 ata_host_init(ap, host, host_set, ent, port_no);
4479 rc = ap->ops->port_start(ap);
4486 scsi_host_put(host);
4491 * ata_device_add - Register hardware device with ATA and SCSI layers
4492 * @ent: Probe information describing hardware device to be registered
4494 * This function processes the information provided in the probe
4495 * information struct @ent, allocates the necessary ATA and SCSI
4496 * host information structures, initializes them, and registers
4497 * everything with requisite kernel subsystems.
4499 * This function requests irqs, probes the ATA bus, and probes
4503 * PCI/etc. bus probe sem.
4506 * Number of ports registered. Zero on error (no ports registered).
4509 int ata_device_add(const struct ata_probe_ent *ent)
4511 unsigned int count = 0, i;
4512 struct device *dev = ent->dev;
4513 struct ata_host_set *host_set;
4516 /* alloc a container for our list of ATA ports (buses) */
4517 host_set = kzalloc(sizeof(struct ata_host_set) +
4518 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4521 spin_lock_init(&host_set->lock);
4523 host_set->dev = dev;
4524 host_set->n_ports = ent->n_ports;
4525 host_set->irq = ent->irq;
4526 host_set->mmio_base = ent->mmio_base;
4527 host_set->private_data = ent->private_data;
4528 host_set->ops = ent->port_ops;
4530 /* register each port bound to this device */
4531 for (i = 0; i < ent->n_ports; i++) {
4532 struct ata_port *ap;
4533 unsigned long xfer_mode_mask;
4535 ap = ata_host_add(ent, host_set, i);
4539 host_set->ports[i] = ap;
4540 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4541 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4542 (ap->pio_mask << ATA_SHIFT_PIO);
4544 /* print per-port info to dmesg */
4545 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4546 "bmdma 0x%lX irq %lu\n",
4548 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4549 ata_mode_string(xfer_mode_mask),
4550 ap->ioaddr.cmd_addr,
4551 ap->ioaddr.ctl_addr,
4552 ap->ioaddr.bmdma_addr,
4556 host_set->ops->irq_clear(ap);
4563 /* obtain irq, that is shared between channels */
4564 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4565 DRV_NAME, host_set))
4568 /* perform each probe synchronously */
4569 DPRINTK("probe begin\n");
4570 for (i = 0; i < count; i++) {
4571 struct ata_port *ap;
4574 ap = host_set->ports[i];
4576 DPRINTK("ata%u: bus probe begin\n", ap->id);
4577 rc = ata_bus_probe(ap);
4578 DPRINTK("ata%u: bus probe end\n", ap->id);
4581 /* FIXME: do something useful here?
4582 * Current libata behavior will
4583 * tear down everything when
4584 * the module is removed
4585 * or the h/w is unplugged.
4589 rc = scsi_add_host(ap->host, dev);
4591 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4593 /* FIXME: do something useful here */
4594 /* FIXME: handle unconditional calls to
4595 * scsi_scan_host and ata_host_remove, below,
4601 /* probes are done, now scan each port's disk(s) */
4602 DPRINTK("host probe begin\n");
4603 for (i = 0; i < count; i++) {
4604 struct ata_port *ap = host_set->ports[i];
4606 ata_scsi_scan_host(ap);
4609 dev_set_drvdata(dev, host_set);
4611 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4612 return ent->n_ports; /* success */
4615 for (i = 0; i < count; i++) {
4616 ata_host_remove(host_set->ports[i], 1);
4617 scsi_host_put(host_set->ports[i]->host);
4621 VPRINTK("EXIT, returning 0\n");
4626 * ata_host_set_remove - PCI layer callback for device removal
4627 * @host_set: ATA host set that was removed
4629 * Unregister all objects associated with this host set. Free those
4633 * Inherited from calling layer (may sleep).
4636 void ata_host_set_remove(struct ata_host_set *host_set)
4638 struct ata_port *ap;
4641 for (i = 0; i < host_set->n_ports; i++) {
4642 ap = host_set->ports[i];
4643 scsi_remove_host(ap->host);
4646 free_irq(host_set->irq, host_set);
4648 for (i = 0; i < host_set->n_ports; i++) {
4649 ap = host_set->ports[i];
4651 ata_scsi_release(ap->host);
4653 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4654 struct ata_ioports *ioaddr = &ap->ioaddr;
4656 if (ioaddr->cmd_addr == 0x1f0)
4657 release_region(0x1f0, 8);
4658 else if (ioaddr->cmd_addr == 0x170)
4659 release_region(0x170, 8);
4662 scsi_host_put(ap->host);
4665 if (host_set->ops->host_stop)
4666 host_set->ops->host_stop(host_set);
4672 * ata_scsi_release - SCSI layer callback hook for host unload
4673 * @host: libata host to be unloaded
4675 * Performs all duties necessary to shut down a libata port...
4676 * Kill port kthread, disable port, and release resources.
4679 * Inherited from SCSI layer.
4685 int ata_scsi_release(struct Scsi_Host *host)
4687 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4691 ap->ops->port_disable(ap);
4692 ata_host_remove(ap, 0);
4699 * ata_std_ports - initialize ioaddr with standard port offsets.
4700 * @ioaddr: IO address structure to be initialized
4702 * Utility function which initializes data_addr, error_addr,
4703 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4704 * device_addr, status_addr, and command_addr to standard offsets
4705 * relative to cmd_addr.
4707 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4710 void ata_std_ports(struct ata_ioports *ioaddr)
4712 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4713 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4714 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4715 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4716 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4717 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4718 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4719 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4720 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4721 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4727 void ata_pci_host_stop (struct ata_host_set *host_set)
4729 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4731 pci_iounmap(pdev, host_set->mmio_base);
4735 * ata_pci_remove_one - PCI layer callback for device removal
4736 * @pdev: PCI device that was removed
4738 * PCI layer indicates to libata via this hook that
4739 * hot-unplug or module unload event has occurred.
4740 * Handle this by unregistering all objects associated
4741 * with this PCI device. Free those objects. Then finally
4742 * release PCI resources and disable device.
4745 * Inherited from PCI layer (may sleep).
4748 void ata_pci_remove_one (struct pci_dev *pdev)
4750 struct device *dev = pci_dev_to_dev(pdev);
4751 struct ata_host_set *host_set = dev_get_drvdata(dev);
4753 ata_host_set_remove(host_set);
4754 pci_release_regions(pdev);
4755 pci_disable_device(pdev);
4756 dev_set_drvdata(dev, NULL);
4759 /* move to PCI subsystem */
4760 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4762 unsigned long tmp = 0;
4764 switch (bits->width) {
4767 pci_read_config_byte(pdev, bits->reg, &tmp8);
4773 pci_read_config_word(pdev, bits->reg, &tmp16);
4779 pci_read_config_dword(pdev, bits->reg, &tmp32);
4790 return (tmp == bits->val) ? 1 : 0;
4793 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4795 pci_save_state(pdev);
4796 pci_disable_device(pdev);
4797 pci_set_power_state(pdev, PCI_D3hot);
4801 int ata_pci_device_resume(struct pci_dev *pdev)
4803 pci_set_power_state(pdev, PCI_D0);
4804 pci_restore_state(pdev);
4805 pci_enable_device(pdev);
4806 pci_set_master(pdev);
4809 #endif /* CONFIG_PCI */
4812 static int __init ata_init(void)
4814 ata_wq = create_workqueue("ata");
4818 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4822 static void __exit ata_exit(void)
4824 destroy_workqueue(ata_wq);
4827 module_init(ata_init);
4828 module_exit(ata_exit);
4830 static unsigned long ratelimit_time;
4831 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4833 int ata_ratelimit(void)
4836 unsigned long flags;
4838 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4840 if (time_after(jiffies, ratelimit_time)) {
4842 ratelimit_time = jiffies + (HZ/5);
4846 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4852 * libata is essentially a library of internal helper functions for
4853 * low-level ATA host controller drivers. As such, the API/ABI is
4854 * likely to change as new drivers are added and updated.
4855 * Do not depend on ABI/API stability.
4858 EXPORT_SYMBOL_GPL(ata_std_bios_param);
4859 EXPORT_SYMBOL_GPL(ata_std_ports);
4860 EXPORT_SYMBOL_GPL(ata_device_add);
4861 EXPORT_SYMBOL_GPL(ata_host_set_remove);
4862 EXPORT_SYMBOL_GPL(ata_sg_init);
4863 EXPORT_SYMBOL_GPL(ata_sg_init_one);
4864 EXPORT_SYMBOL_GPL(__ata_qc_complete);
4865 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4866 EXPORT_SYMBOL_GPL(ata_eng_timeout);
4867 EXPORT_SYMBOL_GPL(ata_tf_load);
4868 EXPORT_SYMBOL_GPL(ata_tf_read);
4869 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4870 EXPORT_SYMBOL_GPL(ata_std_dev_select);
4871 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4872 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4873 EXPORT_SYMBOL_GPL(ata_check_status);
4874 EXPORT_SYMBOL_GPL(ata_altstatus);
4875 EXPORT_SYMBOL_GPL(ata_exec_command);
4876 EXPORT_SYMBOL_GPL(ata_port_start);
4877 EXPORT_SYMBOL_GPL(ata_port_stop);
4878 EXPORT_SYMBOL_GPL(ata_host_stop);
4879 EXPORT_SYMBOL_GPL(ata_interrupt);
4880 EXPORT_SYMBOL_GPL(ata_qc_prep);
4881 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4882 EXPORT_SYMBOL_GPL(ata_bmdma_start);
4883 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4884 EXPORT_SYMBOL_GPL(ata_bmdma_status);
4885 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4886 EXPORT_SYMBOL_GPL(ata_port_probe);
4887 EXPORT_SYMBOL_GPL(sata_phy_reset);
4888 EXPORT_SYMBOL_GPL(__sata_phy_reset);
4889 EXPORT_SYMBOL_GPL(ata_bus_reset);
4890 EXPORT_SYMBOL_GPL(ata_std_probeinit);
4891 EXPORT_SYMBOL_GPL(ata_std_softreset);
4892 EXPORT_SYMBOL_GPL(sata_std_hardreset);
4893 EXPORT_SYMBOL_GPL(ata_std_postreset);
4894 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
4895 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
4896 EXPORT_SYMBOL_GPL(ata_port_disable);
4897 EXPORT_SYMBOL_GPL(ata_ratelimit);
4898 EXPORT_SYMBOL_GPL(ata_busy_sleep);
4899 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4900 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4901 EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
4902 EXPORT_SYMBOL_GPL(ata_scsi_error);
4903 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4904 EXPORT_SYMBOL_GPL(ata_scsi_release);
4905 EXPORT_SYMBOL_GPL(ata_host_intr);
4906 EXPORT_SYMBOL_GPL(ata_dev_classify);
4907 EXPORT_SYMBOL_GPL(ata_dev_id_string);
4908 EXPORT_SYMBOL_GPL(ata_dev_config);
4909 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
4910 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4911 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
4913 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
4914 EXPORT_SYMBOL_GPL(ata_timing_compute);
4915 EXPORT_SYMBOL_GPL(ata_timing_merge);
4918 EXPORT_SYMBOL_GPL(pci_test_config_bits);
4919 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
4920 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4921 EXPORT_SYMBOL_GPL(ata_pci_init_one);
4922 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
4923 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4924 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
4925 #endif /* CONFIG_PCI */
4927 EXPORT_SYMBOL_GPL(ata_device_suspend);
4928 EXPORT_SYMBOL_GPL(ata_device_resume);
4929 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4930 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);