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 unsigned int ata_dev_init_params(struct ata_port *ap,
65 struct ata_device *dev,
68 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
69 struct ata_device *dev);
70 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
72 static unsigned int ata_unique_id = 1;
73 static struct workqueue_struct *ata_wq;
75 int atapi_enabled = 1;
76 module_param(atapi_enabled, int, 0444);
77 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
80 module_param(atapi_dmadir, int, 0444);
81 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
84 module_param_named(fua, libata_fua, int, 0444);
85 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
87 MODULE_AUTHOR("Jeff Garzik");
88 MODULE_DESCRIPTION("Library module for ATA devices");
89 MODULE_LICENSE("GPL");
90 MODULE_VERSION(DRV_VERSION);
94 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
95 * @tf: Taskfile to convert
96 * @fis: Buffer into which data will output
97 * @pmp: Port multiplier port
99 * Converts a standard ATA taskfile to a Serial ATA
100 * FIS structure (Register - Host to Device).
103 * Inherited from caller.
106 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
108 fis[0] = 0x27; /* Register - Host to Device FIS */
109 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
110 bit 7 indicates Command FIS */
111 fis[2] = tf->command;
112 fis[3] = tf->feature;
119 fis[8] = tf->hob_lbal;
120 fis[9] = tf->hob_lbam;
121 fis[10] = tf->hob_lbah;
122 fis[11] = tf->hob_feature;
125 fis[13] = tf->hob_nsect;
136 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
137 * @fis: Buffer from which data will be input
138 * @tf: Taskfile to output
140 * Converts a serial ATA FIS structure to a standard ATA taskfile.
143 * Inherited from caller.
146 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
148 tf->command = fis[2]; /* status */
149 tf->feature = fis[3]; /* error */
156 tf->hob_lbal = fis[8];
157 tf->hob_lbam = fis[9];
158 tf->hob_lbah = fis[10];
161 tf->hob_nsect = fis[13];
164 static const u8 ata_rw_cmds[] = {
168 ATA_CMD_READ_MULTI_EXT,
169 ATA_CMD_WRITE_MULTI_EXT,
173 ATA_CMD_WRITE_MULTI_FUA_EXT,
177 ATA_CMD_PIO_READ_EXT,
178 ATA_CMD_PIO_WRITE_EXT,
191 ATA_CMD_WRITE_FUA_EXT
195 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
196 * @qc: command to examine and configure
198 * Examine the device configuration and tf->flags to calculate
199 * the proper read/write commands and protocol to use.
204 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
206 struct ata_taskfile *tf = &qc->tf;
207 struct ata_device *dev = qc->dev;
210 int index, fua, lba48, write;
212 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
213 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
214 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
216 if (dev->flags & ATA_DFLAG_PIO) {
217 tf->protocol = ATA_PROT_PIO;
218 index = dev->multi_count ? 0 : 8;
219 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
220 /* Unable to use DMA due to host limitation */
221 tf->protocol = ATA_PROT_PIO;
222 index = dev->multi_count ? 0 : 8;
224 tf->protocol = ATA_PROT_DMA;
228 cmd = ata_rw_cmds[index + fua + lba48 + write];
237 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
238 * @pio_mask: pio_mask
239 * @mwdma_mask: mwdma_mask
240 * @udma_mask: udma_mask
242 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
243 * unsigned int xfer_mask.
251 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
252 unsigned int mwdma_mask,
253 unsigned int udma_mask)
255 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
256 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
257 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
261 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
262 * @xfer_mask: xfer_mask to unpack
263 * @pio_mask: resulting pio_mask
264 * @mwdma_mask: resulting mwdma_mask
265 * @udma_mask: resulting udma_mask
267 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
268 * Any NULL distination masks will be ignored.
270 static void ata_unpack_xfermask(unsigned int xfer_mask,
271 unsigned int *pio_mask,
272 unsigned int *mwdma_mask,
273 unsigned int *udma_mask)
276 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
278 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
280 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
283 static const struct ata_xfer_ent {
287 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
288 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
289 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
294 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
295 * @xfer_mask: xfer_mask of interest
297 * Return matching XFER_* value for @xfer_mask. Only the highest
298 * bit of @xfer_mask is considered.
304 * Matching XFER_* value, 0 if no match found.
306 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
308 int highbit = fls(xfer_mask) - 1;
309 const struct ata_xfer_ent *ent;
311 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
312 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
313 return ent->base + highbit - ent->shift;
318 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
319 * @xfer_mode: XFER_* of interest
321 * Return matching xfer_mask for @xfer_mode.
327 * Matching xfer_mask, 0 if no match found.
329 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
331 const struct ata_xfer_ent *ent;
333 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
334 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
335 return 1 << (ent->shift + xfer_mode - ent->base);
340 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
341 * @xfer_mode: XFER_* of interest
343 * Return matching xfer_shift for @xfer_mode.
349 * Matching xfer_shift, -1 if no match found.
351 static int ata_xfer_mode2shift(unsigned int xfer_mode)
353 const struct ata_xfer_ent *ent;
355 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
356 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
362 * ata_mode_string - convert xfer_mask to string
363 * @xfer_mask: mask of bits supported; only highest bit counts.
365 * Determine string which represents the highest speed
366 * (highest bit in @modemask).
372 * Constant C string representing highest speed listed in
373 * @mode_mask, or the constant C string "<n/a>".
375 static const char *ata_mode_string(unsigned int xfer_mask)
377 static const char * const xfer_mode_str[] = {
397 highbit = fls(xfer_mask) - 1;
398 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
399 return xfer_mode_str[highbit];
403 static const char *sata_spd_string(unsigned int spd)
405 static const char * const spd_str[] = {
410 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
412 return spd_str[spd - 1];
415 void ata_dev_disable(struct ata_port *ap, struct ata_device *dev)
417 if (ata_dev_enabled(dev)) {
418 printk(KERN_WARNING "ata%u: dev %u disabled\n",
425 * ata_pio_devchk - PATA device presence detection
426 * @ap: ATA channel to examine
427 * @device: Device to examine (starting at zero)
429 * This technique was originally described in
430 * Hale Landis's ATADRVR (www.ata-atapi.com), and
431 * later found its way into the ATA/ATAPI spec.
433 * Write a pattern to the ATA shadow registers,
434 * and if a device is present, it will respond by
435 * correctly storing and echoing back the
436 * ATA shadow register contents.
442 static unsigned int ata_pio_devchk(struct ata_port *ap,
445 struct ata_ioports *ioaddr = &ap->ioaddr;
448 ap->ops->dev_select(ap, device);
450 outb(0x55, ioaddr->nsect_addr);
451 outb(0xaa, ioaddr->lbal_addr);
453 outb(0xaa, ioaddr->nsect_addr);
454 outb(0x55, ioaddr->lbal_addr);
456 outb(0x55, ioaddr->nsect_addr);
457 outb(0xaa, ioaddr->lbal_addr);
459 nsect = inb(ioaddr->nsect_addr);
460 lbal = inb(ioaddr->lbal_addr);
462 if ((nsect == 0x55) && (lbal == 0xaa))
463 return 1; /* we found a device */
465 return 0; /* nothing found */
469 * ata_mmio_devchk - PATA device presence detection
470 * @ap: ATA channel to examine
471 * @device: Device to examine (starting at zero)
473 * This technique was originally described in
474 * Hale Landis's ATADRVR (www.ata-atapi.com), and
475 * later found its way into the ATA/ATAPI spec.
477 * Write a pattern to the ATA shadow registers,
478 * and if a device is present, it will respond by
479 * correctly storing and echoing back the
480 * ATA shadow register contents.
486 static unsigned int ata_mmio_devchk(struct ata_port *ap,
489 struct ata_ioports *ioaddr = &ap->ioaddr;
492 ap->ops->dev_select(ap, device);
494 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
495 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
498 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
500 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
501 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
503 nsect = readb((void __iomem *) ioaddr->nsect_addr);
504 lbal = readb((void __iomem *) ioaddr->lbal_addr);
506 if ((nsect == 0x55) && (lbal == 0xaa))
507 return 1; /* we found a device */
509 return 0; /* nothing found */
513 * ata_devchk - PATA device presence detection
514 * @ap: ATA channel to examine
515 * @device: Device to examine (starting at zero)
517 * Dispatch ATA device presence detection, depending
518 * on whether we are using PIO or MMIO to talk to the
519 * ATA shadow registers.
525 static unsigned int ata_devchk(struct ata_port *ap,
528 if (ap->flags & ATA_FLAG_MMIO)
529 return ata_mmio_devchk(ap, device);
530 return ata_pio_devchk(ap, device);
534 * ata_dev_classify - determine device type based on ATA-spec signature
535 * @tf: ATA taskfile register set for device to be identified
537 * Determine from taskfile register contents whether a device is
538 * ATA or ATAPI, as per "Signature and persistence" section
539 * of ATA/PI spec (volume 1, sect 5.14).
545 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
546 * the event of failure.
549 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
551 /* Apple's open source Darwin code hints that some devices only
552 * put a proper signature into the LBA mid/high registers,
553 * So, we only check those. It's sufficient for uniqueness.
556 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
557 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
558 DPRINTK("found ATA device by sig\n");
562 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
563 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
564 DPRINTK("found ATAPI device by sig\n");
565 return ATA_DEV_ATAPI;
568 DPRINTK("unknown device\n");
569 return ATA_DEV_UNKNOWN;
573 * ata_dev_try_classify - Parse returned ATA device signature
574 * @ap: ATA channel to examine
575 * @device: Device to examine (starting at zero)
576 * @r_err: Value of error register on completion
578 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
579 * an ATA/ATAPI-defined set of values is placed in the ATA
580 * shadow registers, indicating the results of device detection
583 * Select the ATA device, and read the values from the ATA shadow
584 * registers. Then parse according to the Error register value,
585 * and the spec-defined values examined by ata_dev_classify().
591 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
595 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
597 struct ata_taskfile tf;
601 ap->ops->dev_select(ap, device);
603 memset(&tf, 0, sizeof(tf));
605 ap->ops->tf_read(ap, &tf);
610 /* see if device passed diags */
613 else if ((device == 0) && (err == 0x81))
618 /* determine if device is ATA or ATAPI */
619 class = ata_dev_classify(&tf);
621 if (class == ATA_DEV_UNKNOWN)
623 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
629 * ata_id_string - Convert IDENTIFY DEVICE page into string
630 * @id: IDENTIFY DEVICE results we will examine
631 * @s: string into which data is output
632 * @ofs: offset into identify device page
633 * @len: length of string to return. must be an even number.
635 * The strings in the IDENTIFY DEVICE page are broken up into
636 * 16-bit chunks. Run through the string, and output each
637 * 8-bit chunk linearly, regardless of platform.
643 void ata_id_string(const u16 *id, unsigned char *s,
644 unsigned int ofs, unsigned int len)
663 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
664 * @id: IDENTIFY DEVICE results we will examine
665 * @s: string into which data is output
666 * @ofs: offset into identify device page
667 * @len: length of string to return. must be an odd number.
669 * This function is identical to ata_id_string except that it
670 * trims trailing spaces and terminates the resulting string with
671 * null. @len must be actual maximum length (even number) + 1.
676 void ata_id_c_string(const u16 *id, unsigned char *s,
677 unsigned int ofs, unsigned int len)
683 ata_id_string(id, s, ofs, len - 1);
685 p = s + strnlen(s, len - 1);
686 while (p > s && p[-1] == ' ')
691 static u64 ata_id_n_sectors(const u16 *id)
693 if (ata_id_has_lba(id)) {
694 if (ata_id_has_lba48(id))
695 return ata_id_u64(id, 100);
697 return ata_id_u32(id, 60);
699 if (ata_id_current_chs_valid(id))
700 return ata_id_u32(id, 57);
702 return id[1] * id[3] * id[6];
707 * ata_noop_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * This function performs no actual function.
713 * May be used as the dev_select() entry in ata_port_operations.
718 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
724 * ata_std_dev_select - Select device 0/1 on ATA bus
725 * @ap: ATA channel to manipulate
726 * @device: ATA device (numbered from zero) to select
728 * Use the method defined in the ATA specification to
729 * make either device 0, or device 1, active on the
730 * ATA channel. Works with both PIO and MMIO.
732 * May be used as the dev_select() entry in ata_port_operations.
738 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
743 tmp = ATA_DEVICE_OBS;
745 tmp = ATA_DEVICE_OBS | ATA_DEV1;
747 if (ap->flags & ATA_FLAG_MMIO) {
748 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
750 outb(tmp, ap->ioaddr.device_addr);
752 ata_pause(ap); /* needed; also flushes, for mmio */
756 * ata_dev_select - Select device 0/1 on ATA bus
757 * @ap: ATA channel to manipulate
758 * @device: ATA device (numbered from zero) to select
759 * @wait: non-zero to wait for Status register BSY bit to clear
760 * @can_sleep: non-zero if context allows sleeping
762 * Use the method defined in the ATA specification to
763 * make either device 0, or device 1, active on the
766 * This is a high-level version of ata_std_dev_select(),
767 * which additionally provides the services of inserting
768 * the proper pauses and status polling, where needed.
774 void ata_dev_select(struct ata_port *ap, unsigned int device,
775 unsigned int wait, unsigned int can_sleep)
777 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
778 ap->id, device, wait);
783 ap->ops->dev_select(ap, device);
786 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
793 * ata_dump_id - IDENTIFY DEVICE info debugging output
794 * @id: IDENTIFY DEVICE page to dump
796 * Dump selected 16-bit words from the given IDENTIFY DEVICE
803 static inline void ata_dump_id(const u16 *id)
805 DPRINTK("49==0x%04x "
815 DPRINTK("80==0x%04x "
825 DPRINTK("88==0x%04x "
832 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
833 * @id: IDENTIFY data to compute xfer mask from
835 * Compute the xfermask for this device. This is not as trivial
836 * as it seems if we must consider early devices correctly.
838 * FIXME: pre IDE drive timing (do we care ?).
846 static unsigned int ata_id_xfermask(const u16 *id)
848 unsigned int pio_mask, mwdma_mask, udma_mask;
850 /* Usual case. Word 53 indicates word 64 is valid */
851 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
852 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
856 /* If word 64 isn't valid then Word 51 high byte holds
857 * the PIO timing number for the maximum. Turn it into
860 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
862 /* But wait.. there's more. Design your standards by
863 * committee and you too can get a free iordy field to
864 * process. However its the speeds not the modes that
865 * are supported... Note drivers using the timing API
866 * will get this right anyway
870 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
873 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
874 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
876 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
880 * ata_port_queue_task - Queue port_task
881 * @ap: The ata_port to queue port_task for
883 * Schedule @fn(@data) for execution after @delay jiffies using
884 * port_task. There is one port_task per port and it's the
885 * user(low level driver)'s responsibility to make sure that only
886 * one task is active at any given time.
888 * libata core layer takes care of synchronization between
889 * port_task and EH. ata_port_queue_task() may be ignored for EH
893 * Inherited from caller.
895 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
900 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
903 PREPARE_WORK(&ap->port_task, fn, data);
906 rc = queue_work(ata_wq, &ap->port_task);
908 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
910 /* rc == 0 means that another user is using port task */
915 * ata_port_flush_task - Flush port_task
916 * @ap: The ata_port to flush port_task for
918 * After this function completes, port_task is guranteed not to
919 * be running or scheduled.
922 * Kernel thread context (may sleep)
924 void ata_port_flush_task(struct ata_port *ap)
930 spin_lock_irqsave(&ap->host_set->lock, flags);
931 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
932 spin_unlock_irqrestore(&ap->host_set->lock, flags);
934 DPRINTK("flush #1\n");
935 flush_workqueue(ata_wq);
938 * At this point, if a task is running, it's guaranteed to see
939 * the FLUSH flag; thus, it will never queue pio tasks again.
942 if (!cancel_delayed_work(&ap->port_task)) {
943 DPRINTK("flush #2\n");
944 flush_workqueue(ata_wq);
947 spin_lock_irqsave(&ap->host_set->lock, flags);
948 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
949 spin_unlock_irqrestore(&ap->host_set->lock, flags);
954 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
956 struct completion *waiting = qc->private_data;
958 qc->ap->ops->tf_read(qc->ap, &qc->tf);
963 * ata_exec_internal - execute libata internal command
964 * @ap: Port to which the command is sent
965 * @dev: Device to which the command is sent
966 * @tf: Taskfile registers for the command and the result
967 * @cdb: CDB for packet command
968 * @dma_dir: Data tranfer direction of the command
969 * @buf: Data buffer of the command
970 * @buflen: Length of data buffer
972 * Executes libata internal command with timeout. @tf contains
973 * command on entry and result on return. Timeout and error
974 * conditions are reported via return value. No recovery action
975 * is taken after a command times out. It's caller's duty to
976 * clean up after timeout.
979 * None. Should be called with kernel context, might sleep.
982 unsigned ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
983 struct ata_taskfile *tf, const u8 *cdb,
984 int dma_dir, void *buf, unsigned int buflen)
986 u8 command = tf->command;
987 struct ata_queued_cmd *qc;
988 DECLARE_COMPLETION(wait);
990 unsigned int err_mask;
992 spin_lock_irqsave(&ap->host_set->lock, flags);
994 qc = ata_qc_new_init(ap, dev);
999 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1000 qc->dma_dir = dma_dir;
1001 if (dma_dir != DMA_NONE) {
1002 ata_sg_init_one(qc, buf, buflen);
1003 qc->nsect = buflen / ATA_SECT_SIZE;
1006 qc->private_data = &wait;
1007 qc->complete_fn = ata_qc_complete_internal;
1011 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1013 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1014 ata_port_flush_task(ap);
1016 spin_lock_irqsave(&ap->host_set->lock, flags);
1018 /* We're racing with irq here. If we lose, the
1019 * following test prevents us from completing the qc
1020 * again. If completion irq occurs after here but
1021 * before the caller cleans up, it will result in a
1022 * spurious interrupt. We can live with that.
1024 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1025 qc->err_mask = AC_ERR_TIMEOUT;
1026 ata_qc_complete(qc);
1027 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
1031 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1035 spin_lock_irqsave(&ap->host_set->lock, flags);
1038 err_mask = qc->err_mask;
1042 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1043 * Until those drivers are fixed, we detect the condition
1044 * here, fail the command with AC_ERR_SYSTEM and reenable the
1047 * Note that this doesn't change any behavior as internal
1048 * command failure results in disabling the device in the
1049 * higher layer for LLDDs without new reset/EH callbacks.
1051 * Kill the following code as soon as those drivers are fixed.
1053 if (ap->flags & ATA_FLAG_DISABLED) {
1054 err_mask |= AC_ERR_SYSTEM;
1058 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1064 * ata_pio_need_iordy - check if iordy needed
1067 * Check if the current speed of the device requires IORDY. Used
1068 * by various controllers for chip configuration.
1071 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1074 int speed = adev->pio_mode - XFER_PIO_0;
1081 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1083 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1084 pio = adev->id[ATA_ID_EIDE_PIO];
1085 /* Is the speed faster than the drive allows non IORDY ? */
1087 /* This is cycle times not frequency - watch the logic! */
1088 if (pio > 240) /* PIO2 is 240nS per cycle */
1097 * ata_dev_read_id - Read ID data from the specified device
1098 * @ap: port on which target device resides
1099 * @dev: target device
1100 * @p_class: pointer to class of the target device (may be changed)
1101 * @post_reset: is this read ID post-reset?
1102 * @p_id: read IDENTIFY page (newly allocated)
1104 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1105 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1106 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1107 * for pre-ATA4 drives.
1110 * Kernel thread context (may sleep)
1113 * 0 on success, -errno otherwise.
1115 static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
1116 unsigned int *p_class, int post_reset, u16 **p_id)
1118 unsigned int class = *p_class;
1119 struct ata_taskfile tf;
1120 unsigned int err_mask = 0;
1125 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1127 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1129 id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
1132 reason = "out of memory";
1137 ata_tf_init(ap, &tf, dev->devno);
1141 tf.command = ATA_CMD_ID_ATA;
1144 tf.command = ATA_CMD_ID_ATAPI;
1148 reason = "unsupported class";
1152 tf.protocol = ATA_PROT_PIO;
1154 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_FROM_DEVICE,
1155 id, sizeof(id[0]) * ATA_ID_WORDS);
1158 reason = "I/O error";
1162 swap_buf_le16(id, ATA_ID_WORDS);
1165 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1167 reason = "device reports illegal type";
1171 if (post_reset && class == ATA_DEV_ATA) {
1173 * The exact sequence expected by certain pre-ATA4 drives is:
1176 * INITIALIZE DEVICE PARAMETERS
1178 * Some drives were very specific about that exact sequence.
1180 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1181 err_mask = ata_dev_init_params(ap, dev, id[3], id[6]);
1184 reason = "INIT_DEV_PARAMS failed";
1188 /* current CHS translation info (id[53-58]) might be
1189 * changed. reread the identify device info.
1201 printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
1202 ap->id, dev->devno, reason);
1207 static inline u8 ata_dev_knobble(const struct ata_port *ap,
1208 struct ata_device *dev)
1210 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1214 * ata_dev_configure - Configure the specified ATA/ATAPI device
1215 * @ap: Port on which target device resides
1216 * @dev: Target device to configure
1217 * @print_info: Enable device info printout
1219 * Configure @dev according to @dev->id. Generic and low-level
1220 * driver specific fixups are also applied.
1223 * Kernel thread context (may sleep)
1226 * 0 on success, -errno otherwise
1228 static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
1231 const u16 *id = dev->id;
1232 unsigned int xfer_mask;
1235 if (!ata_dev_enabled(dev)) {
1236 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1237 ap->id, dev->devno);
1241 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1243 /* print device capabilities */
1245 printk(KERN_DEBUG "ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1246 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1247 ap->id, dev->devno, id[49], id[82], id[83],
1248 id[84], id[85], id[86], id[87], id[88]);
1250 /* initialize to-be-configured parameters */
1251 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1252 dev->max_sectors = 0;
1260 * common ATA, ATAPI feature tests
1263 /* find max transfer mode; for printk only */
1264 xfer_mask = ata_id_xfermask(id);
1268 /* ATA-specific feature tests */
1269 if (dev->class == ATA_DEV_ATA) {
1270 dev->n_sectors = ata_id_n_sectors(id);
1272 if (ata_id_has_lba(id)) {
1273 const char *lba_desc;
1276 dev->flags |= ATA_DFLAG_LBA;
1277 if (ata_id_has_lba48(id)) {
1278 dev->flags |= ATA_DFLAG_LBA48;
1282 /* print device info to dmesg */
1284 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1285 "max %s, %Lu sectors: %s\n",
1287 ata_id_major_version(id),
1288 ata_mode_string(xfer_mask),
1289 (unsigned long long)dev->n_sectors,
1294 /* Default translation */
1295 dev->cylinders = id[1];
1297 dev->sectors = id[6];
1299 if (ata_id_current_chs_valid(id)) {
1300 /* Current CHS translation is valid. */
1301 dev->cylinders = id[54];
1302 dev->heads = id[55];
1303 dev->sectors = id[56];
1306 /* print device info to dmesg */
1308 printk(KERN_INFO "ata%u: dev %u ATA-%d, "
1309 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1311 ata_id_major_version(id),
1312 ata_mode_string(xfer_mask),
1313 (unsigned long long)dev->n_sectors,
1314 dev->cylinders, dev->heads, dev->sectors);
1320 /* ATAPI-specific feature tests */
1321 else if (dev->class == ATA_DEV_ATAPI) {
1322 rc = atapi_cdb_len(id);
1323 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1324 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1328 dev->cdb_len = (unsigned int) rc;
1330 /* print device info to dmesg */
1332 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1333 ap->id, dev->devno, ata_mode_string(xfer_mask));
1336 ap->host->max_cmd_len = 0;
1337 for (i = 0; i < ATA_MAX_DEVICES; i++)
1338 ap->host->max_cmd_len = max_t(unsigned int,
1339 ap->host->max_cmd_len,
1340 ap->device[i].cdb_len);
1342 /* limit bridge transfers to udma5, 200 sectors */
1343 if (ata_dev_knobble(ap, dev)) {
1345 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1346 ap->id, dev->devno);
1347 dev->udma_mask &= ATA_UDMA5;
1348 dev->max_sectors = ATA_MAX_SECTORS;
1351 if (ap->ops->dev_config)
1352 ap->ops->dev_config(ap, dev);
1354 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1358 DPRINTK("EXIT, err\n");
1363 * ata_bus_probe - Reset and probe ATA bus
1366 * Master ATA bus probing function. Initiates a hardware-dependent
1367 * bus reset, then attempts to identify any devices found on
1371 * PCI/etc. bus probe sem.
1374 * Zero on success, negative errno otherwise.
1377 static int ata_bus_probe(struct ata_port *ap)
1379 unsigned int classes[ATA_MAX_DEVICES];
1380 int tries[ATA_MAX_DEVICES];
1381 int i, rc, down_xfermask;
1382 struct ata_device *dev;
1386 for (i = 0; i < ATA_MAX_DEVICES; i++)
1387 tries[i] = ATA_PROBE_MAX_TRIES;
1392 /* reset and determine device classes */
1393 for (i = 0; i < ATA_MAX_DEVICES; i++)
1394 classes[i] = ATA_DEV_UNKNOWN;
1396 if (ap->ops->probe_reset) {
1397 rc = ap->ops->probe_reset(ap, classes);
1399 printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
1403 ap->ops->phy_reset(ap);
1405 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1406 if (!(ap->flags & ATA_FLAG_DISABLED))
1407 classes[i] = ap->device[i].class;
1408 ap->device[i].class = ATA_DEV_UNKNOWN;
1414 for (i = 0; i < ATA_MAX_DEVICES; i++)
1415 if (classes[i] == ATA_DEV_UNKNOWN)
1416 classes[i] = ATA_DEV_NONE;
1418 /* read IDENTIFY page and configure devices */
1419 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1420 dev = &ap->device[i];
1423 dev->class = classes[i];
1425 if (!ata_dev_enabled(dev))
1430 rc = ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id);
1434 rc = ata_dev_configure(ap, dev, 1);
1439 /* configure transfer mode */
1440 if (ap->ops->set_mode) {
1441 /* FIXME: make ->set_mode handle no device case and
1442 * return error code and failing device on failure as
1443 * ata_set_mode() does.
1445 for (i = 0; i < ATA_MAX_DEVICES; i++)
1446 if (ata_dev_enabled(&ap->device[i])) {
1447 ap->ops->set_mode(ap);
1452 rc = ata_set_mode(ap, &dev);
1459 for (i = 0; i < ATA_MAX_DEVICES; i++)
1460 if (ata_dev_enabled(&ap->device[i]))
1463 /* no device present, disable port */
1464 ata_port_disable(ap);
1465 ap->ops->port_disable(ap);
1472 tries[dev->devno] = 0;
1475 sata_down_spd_limit(ap);
1478 tries[dev->devno]--;
1479 if (down_xfermask &&
1480 ata_down_xfermask_limit(ap, dev, tries[dev->devno] == 1))
1481 tries[dev->devno] = 0;
1484 if (!tries[dev->devno]) {
1485 ata_down_xfermask_limit(ap, dev, 1);
1486 ata_dev_disable(ap, dev);
1493 * ata_port_probe - Mark port as enabled
1494 * @ap: Port for which we indicate enablement
1496 * Modify @ap data structure such that the system
1497 * thinks that the entire port is enabled.
1499 * LOCKING: host_set lock, or some other form of
1503 void ata_port_probe(struct ata_port *ap)
1505 ap->flags &= ~ATA_FLAG_DISABLED;
1509 * sata_print_link_status - Print SATA link status
1510 * @ap: SATA port to printk link status about
1512 * This function prints link speed and status of a SATA link.
1517 static void sata_print_link_status(struct ata_port *ap)
1519 u32 sstatus, scontrol, tmp;
1521 if (!ap->ops->scr_read)
1524 sstatus = scr_read(ap, SCR_STATUS);
1525 scontrol = scr_read(ap, SCR_CONTROL);
1527 if (sata_dev_present(ap)) {
1528 tmp = (sstatus >> 4) & 0xf;
1530 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1531 ap->id, sata_spd_string(tmp), sstatus, scontrol);
1534 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1535 ap->id, sstatus, scontrol);
1540 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1541 * @ap: SATA port associated with target SATA PHY.
1543 * This function issues commands to standard SATA Sxxx
1544 * PHY registers, to wake up the phy (and device), and
1545 * clear any reset condition.
1548 * PCI/etc. bus probe sem.
1551 void __sata_phy_reset(struct ata_port *ap)
1554 unsigned long timeout = jiffies + (HZ * 5);
1556 if (ap->flags & ATA_FLAG_SATA_RESET) {
1557 /* issue phy wake/reset */
1558 scr_write_flush(ap, SCR_CONTROL, 0x301);
1559 /* Couldn't find anything in SATA I/II specs, but
1560 * AHCI-1.1 10.4.2 says at least 1 ms. */
1563 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
1565 /* wait for phy to become ready, if necessary */
1568 sstatus = scr_read(ap, SCR_STATUS);
1569 if ((sstatus & 0xf) != 1)
1571 } while (time_before(jiffies, timeout));
1573 /* print link status */
1574 sata_print_link_status(ap);
1576 /* TODO: phy layer with polling, timeouts, etc. */
1577 if (sata_dev_present(ap))
1580 ata_port_disable(ap);
1582 if (ap->flags & ATA_FLAG_DISABLED)
1585 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1586 ata_port_disable(ap);
1590 ap->cbl = ATA_CBL_SATA;
1594 * sata_phy_reset - Reset SATA bus.
1595 * @ap: SATA port associated with target SATA PHY.
1597 * This function resets the SATA bus, and then probes
1598 * the bus for devices.
1601 * PCI/etc. bus probe sem.
1604 void sata_phy_reset(struct ata_port *ap)
1606 __sata_phy_reset(ap);
1607 if (ap->flags & ATA_FLAG_DISABLED)
1613 * ata_dev_pair - return other device on cable
1617 * Obtain the other device on the same cable, or if none is
1618 * present NULL is returned
1621 struct ata_device *ata_dev_pair(struct ata_port *ap, struct ata_device *adev)
1623 struct ata_device *pair = &ap->device[1 - adev->devno];
1624 if (!ata_dev_enabled(pair))
1630 * ata_port_disable - Disable port.
1631 * @ap: Port to be disabled.
1633 * Modify @ap data structure such that the system
1634 * thinks that the entire port is disabled, and should
1635 * never attempt to probe or communicate with devices
1638 * LOCKING: host_set lock, or some other form of
1642 void ata_port_disable(struct ata_port *ap)
1644 ap->device[0].class = ATA_DEV_NONE;
1645 ap->device[1].class = ATA_DEV_NONE;
1646 ap->flags |= ATA_FLAG_DISABLED;
1650 * sata_down_spd_limit - adjust SATA spd limit downward
1651 * @ap: Port to adjust SATA spd limit for
1653 * Adjust SATA spd limit of @ap downward. Note that this
1654 * function only adjusts the limit. The change must be applied
1655 * using sata_set_spd().
1658 * Inherited from caller.
1661 * 0 on success, negative errno on failure
1663 int sata_down_spd_limit(struct ata_port *ap)
1668 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1671 mask = ap->sata_spd_limit;
1674 highbit = fls(mask) - 1;
1675 mask &= ~(1 << highbit);
1677 spd = (scr_read(ap, SCR_STATUS) >> 4) & 0xf;
1681 mask &= (1 << spd) - 1;
1685 ap->sata_spd_limit = mask;
1687 printk(KERN_WARNING "ata%u: limiting SATA link speed to %s\n",
1688 ap->id, sata_spd_string(fls(mask)));
1693 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1697 if (ap->sata_spd_limit == UINT_MAX)
1700 limit = fls(ap->sata_spd_limit);
1702 spd = (*scontrol >> 4) & 0xf;
1703 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1705 return spd != limit;
1709 * sata_set_spd_needed - is SATA spd configuration needed
1710 * @ap: Port in question
1712 * Test whether the spd limit in SControl matches
1713 * @ap->sata_spd_limit. This function is used to determine
1714 * whether hardreset is necessary to apply SATA spd
1718 * Inherited from caller.
1721 * 1 if SATA spd configuration is needed, 0 otherwise.
1723 int sata_set_spd_needed(struct ata_port *ap)
1727 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1730 scontrol = scr_read(ap, SCR_CONTROL);
1732 return __sata_set_spd_needed(ap, &scontrol);
1736 * sata_set_spd - set SATA spd according to spd limit
1737 * @ap: Port to set SATA spd for
1739 * Set SATA spd of @ap according to sata_spd_limit.
1742 * Inherited from caller.
1745 * 0 if spd doesn't need to be changed, 1 if spd has been
1746 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1748 int sata_set_spd(struct ata_port *ap)
1752 if (ap->cbl != ATA_CBL_SATA || !ap->ops->scr_read)
1755 scontrol = scr_read(ap, SCR_CONTROL);
1756 if (!__sata_set_spd_needed(ap, &scontrol))
1759 scr_write(ap, SCR_CONTROL, scontrol);
1764 * This mode timing computation functionality is ported over from
1765 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1768 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1769 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1770 * for PIO 5, which is a nonstandard extension and UDMA6, which
1771 * is currently supported only by Maxtor drives.
1774 static const struct ata_timing ata_timing[] = {
1776 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1777 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1778 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1779 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1781 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1782 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1783 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1785 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1787 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1788 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1789 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1791 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1792 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1793 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1795 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1796 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1797 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1799 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1800 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1801 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1803 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1808 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1809 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1811 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1813 q->setup = EZ(t->setup * 1000, T);
1814 q->act8b = EZ(t->act8b * 1000, T);
1815 q->rec8b = EZ(t->rec8b * 1000, T);
1816 q->cyc8b = EZ(t->cyc8b * 1000, T);
1817 q->active = EZ(t->active * 1000, T);
1818 q->recover = EZ(t->recover * 1000, T);
1819 q->cycle = EZ(t->cycle * 1000, T);
1820 q->udma = EZ(t->udma * 1000, UT);
1823 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1824 struct ata_timing *m, unsigned int what)
1826 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1827 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1828 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1829 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1830 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1831 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1832 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1833 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1836 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1838 const struct ata_timing *t;
1840 for (t = ata_timing; t->mode != speed; t++)
1841 if (t->mode == 0xFF)
1846 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1847 struct ata_timing *t, int T, int UT)
1849 const struct ata_timing *s;
1850 struct ata_timing p;
1856 if (!(s = ata_timing_find_mode(speed)))
1859 memcpy(t, s, sizeof(*s));
1862 * If the drive is an EIDE drive, it can tell us it needs extended
1863 * PIO/MW_DMA cycle timing.
1866 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1867 memset(&p, 0, sizeof(p));
1868 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1869 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1870 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1871 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1872 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1874 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1878 * Convert the timing to bus clock counts.
1881 ata_timing_quantize(t, t, T, UT);
1884 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1885 * S.M.A.R.T * and some other commands. We have to ensure that the
1886 * DMA cycle timing is slower/equal than the fastest PIO timing.
1889 if (speed > XFER_PIO_4) {
1890 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1891 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1895 * Lengthen active & recovery time so that cycle time is correct.
1898 if (t->act8b + t->rec8b < t->cyc8b) {
1899 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1900 t->rec8b = t->cyc8b - t->act8b;
1903 if (t->active + t->recover < t->cycle) {
1904 t->active += (t->cycle - (t->active + t->recover)) / 2;
1905 t->recover = t->cycle - t->active;
1912 * ata_down_xfermask_limit - adjust dev xfer masks downward
1913 * @ap: Port associated with device @dev
1914 * @dev: Device to adjust xfer masks
1915 * @force_pio0: Force PIO0
1917 * Adjust xfer masks of @dev downward. Note that this function
1918 * does not apply the change. Invoking ata_set_mode() afterwards
1919 * will apply the limit.
1922 * Inherited from caller.
1925 * 0 on success, negative errno on failure
1927 int ata_down_xfermask_limit(struct ata_port *ap, struct ata_device *dev,
1930 unsigned long xfer_mask;
1933 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1938 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1939 if (xfer_mask & ATA_MASK_UDMA)
1940 xfer_mask &= ~ATA_MASK_MWDMA;
1942 highbit = fls(xfer_mask) - 1;
1943 xfer_mask &= ~(1 << highbit);
1945 xfer_mask &= 1 << ATA_SHIFT_PIO;
1949 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1952 printk(KERN_WARNING "ata%u: dev %u limiting speed to %s\n",
1953 ap->id, dev->devno, ata_mode_string(xfer_mask));
1961 static int ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1963 unsigned int err_mask;
1966 dev->flags &= ~ATA_DFLAG_PIO;
1967 if (dev->xfer_shift == ATA_SHIFT_PIO)
1968 dev->flags |= ATA_DFLAG_PIO;
1970 err_mask = ata_dev_set_xfermode(ap, dev);
1973 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1978 rc = ata_dev_revalidate(ap, dev, 0);
1982 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1983 dev->xfer_shift, (int)dev->xfer_mode);
1985 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1987 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1992 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1993 * @ap: port on which timings will be programmed
1994 * @r_failed_dev: out paramter for failed device
1996 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1997 * ata_set_mode() fails, pointer to the failing device is
1998 * returned in @r_failed_dev.
2001 * PCI/etc. bus probe sem.
2004 * 0 on success, negative errno otherwise
2006 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2008 struct ata_device *dev;
2009 int i, rc = 0, used_dma = 0, found = 0;
2011 /* step 1: calculate xfer_mask */
2012 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2013 unsigned int pio_mask, dma_mask;
2015 dev = &ap->device[i];
2017 if (!ata_dev_enabled(dev))
2020 ata_dev_xfermask(ap, dev);
2022 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2023 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2024 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2025 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2034 /* step 2: always set host PIO timings */
2035 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2036 dev = &ap->device[i];
2037 if (!ata_dev_enabled(dev))
2040 if (!dev->pio_mode) {
2041 printk(KERN_WARNING "ata%u: dev %u no PIO support\n",
2042 ap->id, dev->devno);
2047 dev->xfer_mode = dev->pio_mode;
2048 dev->xfer_shift = ATA_SHIFT_PIO;
2049 if (ap->ops->set_piomode)
2050 ap->ops->set_piomode(ap, dev);
2053 /* step 3: set host DMA timings */
2054 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2055 dev = &ap->device[i];
2057 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2060 dev->xfer_mode = dev->dma_mode;
2061 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2062 if (ap->ops->set_dmamode)
2063 ap->ops->set_dmamode(ap, dev);
2066 /* step 4: update devices' xfer mode */
2067 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2068 dev = &ap->device[i];
2070 if (!ata_dev_enabled(dev))
2073 rc = ata_dev_set_mode(ap, dev);
2078 /* Record simplex status. If we selected DMA then the other
2079 * host channels are not permitted to do so.
2081 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2082 ap->host_set->simplex_claimed = 1;
2084 /* step5: chip specific finalisation */
2085 if (ap->ops->post_set_mode)
2086 ap->ops->post_set_mode(ap);
2090 *r_failed_dev = dev;
2095 * ata_tf_to_host - issue ATA taskfile to host controller
2096 * @ap: port to which command is being issued
2097 * @tf: ATA taskfile register set
2099 * Issues ATA taskfile register set to ATA host controller,
2100 * with proper synchronization with interrupt handler and
2104 * spin_lock_irqsave(host_set lock)
2107 static inline void ata_tf_to_host(struct ata_port *ap,
2108 const struct ata_taskfile *tf)
2110 ap->ops->tf_load(ap, tf);
2111 ap->ops->exec_command(ap, tf);
2115 * ata_busy_sleep - sleep until BSY clears, or timeout
2116 * @ap: port containing status register to be polled
2117 * @tmout_pat: impatience timeout
2118 * @tmout: overall timeout
2120 * Sleep until ATA Status register bit BSY clears,
2121 * or a timeout occurs.
2126 unsigned int ata_busy_sleep (struct ata_port *ap,
2127 unsigned long tmout_pat, unsigned long tmout)
2129 unsigned long timer_start, timeout;
2132 status = ata_busy_wait(ap, ATA_BUSY, 300);
2133 timer_start = jiffies;
2134 timeout = timer_start + tmout_pat;
2135 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2137 status = ata_busy_wait(ap, ATA_BUSY, 3);
2140 if (status & ATA_BUSY)
2141 printk(KERN_WARNING "ata%u is slow to respond, "
2142 "please be patient\n", ap->id);
2144 timeout = timer_start + tmout;
2145 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2147 status = ata_chk_status(ap);
2150 if (status & ATA_BUSY) {
2151 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
2152 ap->id, tmout / HZ);
2159 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2161 struct ata_ioports *ioaddr = &ap->ioaddr;
2162 unsigned int dev0 = devmask & (1 << 0);
2163 unsigned int dev1 = devmask & (1 << 1);
2164 unsigned long timeout;
2166 /* if device 0 was found in ata_devchk, wait for its
2170 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2172 /* if device 1 was found in ata_devchk, wait for
2173 * register access, then wait for BSY to clear
2175 timeout = jiffies + ATA_TMOUT_BOOT;
2179 ap->ops->dev_select(ap, 1);
2180 if (ap->flags & ATA_FLAG_MMIO) {
2181 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2182 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2184 nsect = inb(ioaddr->nsect_addr);
2185 lbal = inb(ioaddr->lbal_addr);
2187 if ((nsect == 1) && (lbal == 1))
2189 if (time_after(jiffies, timeout)) {
2193 msleep(50); /* give drive a breather */
2196 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2198 /* is all this really necessary? */
2199 ap->ops->dev_select(ap, 0);
2201 ap->ops->dev_select(ap, 1);
2203 ap->ops->dev_select(ap, 0);
2206 static unsigned int ata_bus_softreset(struct ata_port *ap,
2207 unsigned int devmask)
2209 struct ata_ioports *ioaddr = &ap->ioaddr;
2211 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2213 /* software reset. causes dev0 to be selected */
2214 if (ap->flags & ATA_FLAG_MMIO) {
2215 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2216 udelay(20); /* FIXME: flush */
2217 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2218 udelay(20); /* FIXME: flush */
2219 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2221 outb(ap->ctl, ioaddr->ctl_addr);
2223 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2225 outb(ap->ctl, ioaddr->ctl_addr);
2228 /* spec mandates ">= 2ms" before checking status.
2229 * We wait 150ms, because that was the magic delay used for
2230 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2231 * between when the ATA command register is written, and then
2232 * status is checked. Because waiting for "a while" before
2233 * checking status is fine, post SRST, we perform this magic
2234 * delay here as well.
2236 * Old drivers/ide uses the 2mS rule and then waits for ready
2240 /* Before we perform post reset processing we want to see if
2241 * the bus shows 0xFF because the odd clown forgets the D7
2242 * pulldown resistor.
2244 if (ata_check_status(ap) == 0xFF) {
2245 printk(KERN_ERR "ata%u: SRST failed (status 0xFF)\n", ap->id);
2246 return AC_ERR_OTHER;
2249 ata_bus_post_reset(ap, devmask);
2255 * ata_bus_reset - reset host port and associated ATA channel
2256 * @ap: port to reset
2258 * This is typically the first time we actually start issuing
2259 * commands to the ATA channel. We wait for BSY to clear, then
2260 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2261 * result. Determine what devices, if any, are on the channel
2262 * by looking at the device 0/1 error register. Look at the signature
2263 * stored in each device's taskfile registers, to determine if
2264 * the device is ATA or ATAPI.
2267 * PCI/etc. bus probe sem.
2268 * Obtains host_set lock.
2271 * Sets ATA_FLAG_DISABLED if bus reset fails.
2274 void ata_bus_reset(struct ata_port *ap)
2276 struct ata_ioports *ioaddr = &ap->ioaddr;
2277 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2279 unsigned int dev0, dev1 = 0, devmask = 0;
2281 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2283 /* determine if device 0/1 are present */
2284 if (ap->flags & ATA_FLAG_SATA_RESET)
2287 dev0 = ata_devchk(ap, 0);
2289 dev1 = ata_devchk(ap, 1);
2293 devmask |= (1 << 0);
2295 devmask |= (1 << 1);
2297 /* select device 0 again */
2298 ap->ops->dev_select(ap, 0);
2300 /* issue bus reset */
2301 if (ap->flags & ATA_FLAG_SRST)
2302 if (ata_bus_softreset(ap, devmask))
2306 * determine by signature whether we have ATA or ATAPI devices
2308 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2309 if ((slave_possible) && (err != 0x81))
2310 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2312 /* re-enable interrupts */
2313 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2316 /* is double-select really necessary? */
2317 if (ap->device[1].class != ATA_DEV_NONE)
2318 ap->ops->dev_select(ap, 1);
2319 if (ap->device[0].class != ATA_DEV_NONE)
2320 ap->ops->dev_select(ap, 0);
2322 /* if no devices were detected, disable this port */
2323 if ((ap->device[0].class == ATA_DEV_NONE) &&
2324 (ap->device[1].class == ATA_DEV_NONE))
2327 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2328 /* set up device control for ATA_FLAG_SATA_RESET */
2329 if (ap->flags & ATA_FLAG_MMIO)
2330 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2332 outb(ap->ctl, ioaddr->ctl_addr);
2339 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
2340 ap->ops->port_disable(ap);
2345 static int sata_phy_resume(struct ata_port *ap)
2347 unsigned long timeout = jiffies + (HZ * 5);
2348 u32 scontrol, sstatus;
2350 scontrol = scr_read(ap, SCR_CONTROL);
2351 scontrol = (scontrol & 0x0f0) | 0x300;
2352 scr_write_flush(ap, SCR_CONTROL, scontrol);
2354 /* Wait for phy to become ready, if necessary. */
2357 sstatus = scr_read(ap, SCR_STATUS);
2358 if ((sstatus & 0xf) != 1)
2360 } while (time_before(jiffies, timeout));
2366 * ata_std_probeinit - initialize probing
2367 * @ap: port to be probed
2369 * @ap is about to be probed. Initialize it. This function is
2370 * to be used as standard callback for ata_drive_probe_reset().
2372 * NOTE!!! Do not use this function as probeinit if a low level
2373 * driver implements only hardreset. Just pass NULL as probeinit
2374 * in that case. Using this function is probably okay but doing
2375 * so makes reset sequence different from the original
2376 * ->phy_reset implementation and Jeff nervous. :-P
2378 void ata_std_probeinit(struct ata_port *ap)
2380 if ((ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read) {
2383 /* set cable type and resume link */
2384 ap->cbl = ATA_CBL_SATA;
2385 sata_phy_resume(ap);
2387 /* init sata_spd_limit to the current value */
2388 spd = (scr_read(ap, SCR_CONTROL) & 0xf0) >> 4;
2390 ap->sata_spd_limit &= (1 << spd) - 1;
2392 /* wait for device */
2393 if (sata_dev_present(ap))
2394 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2399 * ata_std_softreset - reset host port via ATA SRST
2400 * @ap: port to reset
2401 * @classes: resulting classes of attached devices
2403 * Reset host port using ATA SRST. This function is to be used
2404 * as standard callback for ata_drive_*_reset() functions.
2407 * Kernel thread context (may sleep)
2410 * 0 on success, -errno otherwise.
2412 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2414 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2415 unsigned int devmask = 0, err_mask;
2420 if (ap->ops->scr_read && !sata_dev_present(ap)) {
2421 classes[0] = ATA_DEV_NONE;
2425 /* determine if device 0/1 are present */
2426 if (ata_devchk(ap, 0))
2427 devmask |= (1 << 0);
2428 if (slave_possible && ata_devchk(ap, 1))
2429 devmask |= (1 << 1);
2431 /* select device 0 again */
2432 ap->ops->dev_select(ap, 0);
2434 /* issue bus reset */
2435 DPRINTK("about to softreset, devmask=%x\n", devmask);
2436 err_mask = ata_bus_softreset(ap, devmask);
2438 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
2443 /* determine by signature whether we have ATA or ATAPI devices */
2444 classes[0] = ata_dev_try_classify(ap, 0, &err);
2445 if (slave_possible && err != 0x81)
2446 classes[1] = ata_dev_try_classify(ap, 1, &err);
2449 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2454 * sata_std_hardreset - reset host port via SATA phy reset
2455 * @ap: port to reset
2456 * @class: resulting class of attached device
2458 * SATA phy-reset host port using DET bits of SControl register.
2459 * This function is to be used as standard callback for
2460 * ata_drive_*_reset().
2463 * Kernel thread context (may sleep)
2466 * 0 on success, -errno otherwise.
2468 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2474 if (sata_set_spd_needed(ap)) {
2475 /* SATA spec says nothing about how to reconfigure
2476 * spd. To be on the safe side, turn off phy during
2477 * reconfiguration. This works for at least ICH7 AHCI
2480 scontrol = scr_read(ap, SCR_CONTROL);
2481 scontrol = (scontrol & 0x0f0) | 0x302;
2482 scr_write_flush(ap, SCR_CONTROL, scontrol);
2487 /* issue phy wake/reset */
2488 scontrol = scr_read(ap, SCR_CONTROL);
2489 scontrol = (scontrol & 0x0f0) | 0x301;
2490 scr_write_flush(ap, SCR_CONTROL, scontrol);
2492 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2493 * 10.4.2 says at least 1 ms.
2497 /* bring phy back */
2498 sata_phy_resume(ap);
2500 /* TODO: phy layer with polling, timeouts, etc. */
2501 if (!sata_dev_present(ap)) {
2502 *class = ATA_DEV_NONE;
2503 DPRINTK("EXIT, link offline\n");
2507 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2509 "ata%u: COMRESET failed (device not ready)\n", ap->id);
2513 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2515 *class = ata_dev_try_classify(ap, 0, NULL);
2517 DPRINTK("EXIT, class=%u\n", *class);
2522 * ata_std_postreset - standard postreset callback
2523 * @ap: the target ata_port
2524 * @classes: classes of attached devices
2526 * This function is invoked after a successful reset. Note that
2527 * the device might have been reset more than once using
2528 * different reset methods before postreset is invoked.
2530 * This function is to be used as standard callback for
2531 * ata_drive_*_reset().
2534 * Kernel thread context (may sleep)
2536 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2540 /* print link status */
2541 if (ap->cbl == ATA_CBL_SATA)
2542 sata_print_link_status(ap);
2544 /* re-enable interrupts */
2545 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2548 /* is double-select really necessary? */
2549 if (classes[0] != ATA_DEV_NONE)
2550 ap->ops->dev_select(ap, 1);
2551 if (classes[1] != ATA_DEV_NONE)
2552 ap->ops->dev_select(ap, 0);
2554 /* bail out if no device is present */
2555 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2556 DPRINTK("EXIT, no device\n");
2560 /* set up device control */
2561 if (ap->ioaddr.ctl_addr) {
2562 if (ap->flags & ATA_FLAG_MMIO)
2563 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2565 outb(ap->ctl, ap->ioaddr.ctl_addr);
2572 * ata_std_probe_reset - standard probe reset method
2573 * @ap: prot to perform probe-reset
2574 * @classes: resulting classes of attached devices
2576 * The stock off-the-shelf ->probe_reset method.
2579 * Kernel thread context (may sleep)
2582 * 0 on success, -errno otherwise.
2584 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2586 ata_reset_fn_t hardreset;
2589 if (ap->cbl == ATA_CBL_SATA && ap->ops->scr_read)
2590 hardreset = sata_std_hardreset;
2592 return ata_drive_probe_reset(ap, ata_std_probeinit,
2593 ata_std_softreset, hardreset,
2594 ata_std_postreset, classes);
2597 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2598 ata_postreset_fn_t postreset, unsigned int *classes)
2602 for (i = 0; i < ATA_MAX_DEVICES; i++)
2603 classes[i] = ATA_DEV_UNKNOWN;
2605 rc = reset(ap, classes);
2609 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2610 * is complete and convert all ATA_DEV_UNKNOWN to
2613 for (i = 0; i < ATA_MAX_DEVICES; i++)
2614 if (classes[i] != ATA_DEV_UNKNOWN)
2617 if (i < ATA_MAX_DEVICES)
2618 for (i = 0; i < ATA_MAX_DEVICES; i++)
2619 if (classes[i] == ATA_DEV_UNKNOWN)
2620 classes[i] = ATA_DEV_NONE;
2623 postreset(ap, classes);
2629 * ata_drive_probe_reset - Perform probe reset with given methods
2630 * @ap: port to reset
2631 * @probeinit: probeinit method (can be NULL)
2632 * @softreset: softreset method (can be NULL)
2633 * @hardreset: hardreset method (can be NULL)
2634 * @postreset: postreset method (can be NULL)
2635 * @classes: resulting classes of attached devices
2637 * Reset the specified port and classify attached devices using
2638 * given methods. This function prefers softreset but tries all
2639 * possible reset sequences to reset and classify devices. This
2640 * function is intended to be used for constructing ->probe_reset
2641 * callback by low level drivers.
2643 * Reset methods should follow the following rules.
2645 * - Return 0 on sucess, -errno on failure.
2646 * - If classification is supported, fill classes[] with
2647 * recognized class codes.
2648 * - If classification is not supported, leave classes[] alone.
2651 * Kernel thread context (may sleep)
2654 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2655 * if classification fails, and any error code from reset
2658 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2659 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2660 ata_postreset_fn_t postreset, unsigned int *classes)
2667 if (softreset && !sata_set_spd_needed(ap)) {
2668 rc = ata_do_reset(ap, softreset, postreset, classes);
2669 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2671 printk(KERN_INFO "ata%u: softreset failed, will try "
2672 "hardreset in 5 secs\n", ap->id);
2680 rc = ata_do_reset(ap, hardreset, postreset, classes);
2682 if (classes[0] != ATA_DEV_UNKNOWN)
2687 if (sata_down_spd_limit(ap))
2690 printk(KERN_INFO "ata%u: hardreset failed, will retry "
2691 "in 5 secs\n", ap->id);
2696 printk(KERN_INFO "ata%u: hardreset succeeded without "
2697 "classification, will retry softreset in 5 secs\n",
2701 rc = ata_do_reset(ap, softreset, postreset, classes);
2705 if (rc == 0 && classes[0] == ATA_DEV_UNKNOWN)
2711 * ata_dev_same_device - Determine whether new ID matches configured device
2712 * @ap: port on which the device to compare against resides
2713 * @dev: device to compare against
2714 * @new_class: class of the new device
2715 * @new_id: IDENTIFY page of the new device
2717 * Compare @new_class and @new_id against @dev and determine
2718 * whether @dev is the device indicated by @new_class and
2725 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2727 static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
2728 unsigned int new_class, const u16 *new_id)
2730 const u16 *old_id = dev->id;
2731 unsigned char model[2][41], serial[2][21];
2734 if (dev->class != new_class) {
2736 "ata%u: dev %u class mismatch %d != %d\n",
2737 ap->id, dev->devno, dev->class, new_class);
2741 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2742 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2743 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2744 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2745 new_n_sectors = ata_id_n_sectors(new_id);
2747 if (strcmp(model[0], model[1])) {
2749 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2750 ap->id, dev->devno, model[0], model[1]);
2754 if (strcmp(serial[0], serial[1])) {
2756 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2757 ap->id, dev->devno, serial[0], serial[1]);
2761 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2763 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2764 ap->id, dev->devno, (unsigned long long)dev->n_sectors,
2765 (unsigned long long)new_n_sectors);
2773 * ata_dev_revalidate - Revalidate ATA device
2774 * @ap: port on which the device to revalidate resides
2775 * @dev: device to revalidate
2776 * @post_reset: is this revalidation after reset?
2778 * Re-read IDENTIFY page and make sure @dev is still attached to
2782 * Kernel thread context (may sleep)
2785 * 0 on success, negative errno otherwise
2787 int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
2790 unsigned int class = dev->class;
2794 if (!ata_dev_enabled(dev)) {
2799 /* allocate & read ID data */
2800 rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
2804 /* is the device still there? */
2805 if (!ata_dev_same_device(ap, dev, class, id)) {
2813 /* configure device according to the new ID */
2814 rc = ata_dev_configure(ap, dev, 0);
2819 printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
2820 ap->id, dev->devno, rc);
2825 static const char * const ata_dma_blacklist [] = {
2826 "WDC AC11000H", NULL,
2827 "WDC AC22100H", NULL,
2828 "WDC AC32500H", NULL,
2829 "WDC AC33100H", NULL,
2830 "WDC AC31600H", NULL,
2831 "WDC AC32100H", "24.09P07",
2832 "WDC AC23200L", "21.10N21",
2833 "Compaq CRD-8241B", NULL,
2838 "SanDisk SDP3B", NULL,
2839 "SanDisk SDP3B-64", NULL,
2840 "SANYO CD-ROM CRD", NULL,
2841 "HITACHI CDR-8", NULL,
2842 "HITACHI CDR-8335", NULL,
2843 "HITACHI CDR-8435", NULL,
2844 "Toshiba CD-ROM XM-6202B", NULL,
2845 "TOSHIBA CD-ROM XM-1702BC", NULL,
2847 "E-IDE CD-ROM CR-840", NULL,
2848 "CD-ROM Drive/F5A", NULL,
2849 "WPI CDD-820", NULL,
2850 "SAMSUNG CD-ROM SC-148C", NULL,
2851 "SAMSUNG CD-ROM SC", NULL,
2852 "SanDisk SDP3B-64", NULL,
2853 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2854 "_NEC DV5800A", NULL,
2855 "SAMSUNG CD-ROM SN-124", "N001"
2858 static int ata_strim(char *s, size_t len)
2860 len = strnlen(s, len);
2862 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2863 while ((len > 0) && (s[len - 1] == ' ')) {
2870 static int ata_dma_blacklisted(const struct ata_device *dev)
2872 unsigned char model_num[40];
2873 unsigned char model_rev[16];
2874 unsigned int nlen, rlen;
2877 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2879 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2881 nlen = ata_strim(model_num, sizeof(model_num));
2882 rlen = ata_strim(model_rev, sizeof(model_rev));
2884 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2885 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2886 if (ata_dma_blacklist[i+1] == NULL)
2888 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2896 * ata_dev_xfermask - Compute supported xfermask of the given device
2897 * @ap: Port on which the device to compute xfermask for resides
2898 * @dev: Device to compute xfermask for
2900 * Compute supported xfermask of @dev and store it in
2901 * dev->*_mask. This function is responsible for applying all
2902 * known limits including host controller limits, device
2905 * FIXME: The current implementation limits all transfer modes to
2906 * the fastest of the lowested device on the port. This is not
2907 * required on most controllers.
2912 static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
2914 struct ata_host_set *hs = ap->host_set;
2915 unsigned long xfer_mask;
2918 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2919 ap->mwdma_mask, ap->udma_mask);
2921 /* Apply cable rule here. Don't apply it early because when
2922 * we handle hot plug the cable type can itself change.
2924 if (ap->cbl == ATA_CBL_PATA40)
2925 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2927 /* FIXME: Use port-wide xfermask for now */
2928 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2929 struct ata_device *d = &ap->device[i];
2931 if (ata_dev_absent(d))
2934 if (ata_dev_disabled(d)) {
2935 /* to avoid violating device selection timing */
2936 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2937 UINT_MAX, UINT_MAX);
2941 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2942 d->mwdma_mask, d->udma_mask);
2943 xfer_mask &= ata_id_xfermask(d->id);
2944 if (ata_dma_blacklisted(d))
2945 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2948 if (ata_dma_blacklisted(dev))
2949 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
2950 "disabling DMA\n", ap->id, dev->devno);
2952 if (hs->flags & ATA_HOST_SIMPLEX) {
2953 if (hs->simplex_claimed)
2954 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2957 if (ap->ops->mode_filter)
2958 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2960 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2961 &dev->mwdma_mask, &dev->udma_mask);
2965 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2966 * @ap: Port associated with device @dev
2967 * @dev: Device to which command will be sent
2969 * Issue SET FEATURES - XFER MODE command to device @dev
2973 * PCI/etc. bus probe sem.
2976 * 0 on success, AC_ERR_* mask otherwise.
2979 static unsigned int ata_dev_set_xfermode(struct ata_port *ap,
2980 struct ata_device *dev)
2982 struct ata_taskfile tf;
2983 unsigned int err_mask;
2985 /* set up set-features taskfile */
2986 DPRINTK("set features - xfer mode\n");
2988 ata_tf_init(ap, &tf, dev->devno);
2989 tf.command = ATA_CMD_SET_FEATURES;
2990 tf.feature = SETFEATURES_XFER;
2991 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2992 tf.protocol = ATA_PROT_NODATA;
2993 tf.nsect = dev->xfer_mode;
2995 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
2997 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3002 * ata_dev_init_params - Issue INIT DEV PARAMS command
3003 * @ap: Port associated with device @dev
3004 * @dev: Device to which command will be sent
3007 * Kernel thread context (may sleep)
3010 * 0 on success, AC_ERR_* mask otherwise.
3013 static unsigned int ata_dev_init_params(struct ata_port *ap,
3014 struct ata_device *dev,
3018 struct ata_taskfile tf;
3019 unsigned int err_mask;
3021 /* Number of sectors per track 1-255. Number of heads 1-16 */
3022 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3023 return AC_ERR_INVALID;
3025 /* set up init dev params taskfile */
3026 DPRINTK("init dev params \n");
3028 ata_tf_init(ap, &tf, dev->devno);
3029 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3030 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3031 tf.protocol = ATA_PROT_NODATA;
3033 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3035 err_mask = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
3037 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3042 * ata_sg_clean - Unmap DMA memory associated with command
3043 * @qc: Command containing DMA memory to be released
3045 * Unmap all mapped DMA memory associated with this command.
3048 * spin_lock_irqsave(host_set lock)
3051 static void ata_sg_clean(struct ata_queued_cmd *qc)
3053 struct ata_port *ap = qc->ap;
3054 struct scatterlist *sg = qc->__sg;
3055 int dir = qc->dma_dir;
3056 void *pad_buf = NULL;
3058 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3059 WARN_ON(sg == NULL);
3061 if (qc->flags & ATA_QCFLAG_SINGLE)
3062 WARN_ON(qc->n_elem > 1);
3064 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3066 /* if we padded the buffer out to 32-bit bound, and data
3067 * xfer direction is from-device, we must copy from the
3068 * pad buffer back into the supplied buffer
3070 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3071 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3073 if (qc->flags & ATA_QCFLAG_SG) {
3075 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3076 /* restore last sg */
3077 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3079 struct scatterlist *psg = &qc->pad_sgent;
3080 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3081 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3082 kunmap_atomic(addr, KM_IRQ0);
3086 dma_unmap_single(ap->dev,
3087 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3090 sg->length += qc->pad_len;
3092 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3093 pad_buf, qc->pad_len);
3096 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3101 * ata_fill_sg - Fill PCI IDE PRD table
3102 * @qc: Metadata associated with taskfile to be transferred
3104 * Fill PCI IDE PRD (scatter-gather) table with segments
3105 * associated with the current disk command.
3108 * spin_lock_irqsave(host_set lock)
3111 static void ata_fill_sg(struct ata_queued_cmd *qc)
3113 struct ata_port *ap = qc->ap;
3114 struct scatterlist *sg;
3117 WARN_ON(qc->__sg == NULL);
3118 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3121 ata_for_each_sg(sg, qc) {
3125 /* determine if physical DMA addr spans 64K boundary.
3126 * Note h/w doesn't support 64-bit, so we unconditionally
3127 * truncate dma_addr_t to u32.
3129 addr = (u32) sg_dma_address(sg);
3130 sg_len = sg_dma_len(sg);
3133 offset = addr & 0xffff;
3135 if ((offset + sg_len) > 0x10000)
3136 len = 0x10000 - offset;
3138 ap->prd[idx].addr = cpu_to_le32(addr);
3139 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3140 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3149 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3152 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3153 * @qc: Metadata associated with taskfile to check
3155 * Allow low-level driver to filter ATA PACKET commands, returning
3156 * a status indicating whether or not it is OK to use DMA for the
3157 * supplied PACKET command.
3160 * spin_lock_irqsave(host_set lock)
3162 * RETURNS: 0 when ATAPI DMA can be used
3165 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3167 struct ata_port *ap = qc->ap;
3168 int rc = 0; /* Assume ATAPI DMA is OK by default */
3170 if (ap->ops->check_atapi_dma)
3171 rc = ap->ops->check_atapi_dma(qc);
3176 * ata_qc_prep - Prepare taskfile for submission
3177 * @qc: Metadata associated with taskfile to be prepared
3179 * Prepare ATA taskfile for submission.
3182 * spin_lock_irqsave(host_set lock)
3184 void ata_qc_prep(struct ata_queued_cmd *qc)
3186 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3192 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3195 * ata_sg_init_one - Associate command with memory buffer
3196 * @qc: Command to be associated
3197 * @buf: Memory buffer
3198 * @buflen: Length of memory buffer, in bytes.
3200 * Initialize the data-related elements of queued_cmd @qc
3201 * to point to a single memory buffer, @buf of byte length @buflen.
3204 * spin_lock_irqsave(host_set lock)
3207 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3209 struct scatterlist *sg;
3211 qc->flags |= ATA_QCFLAG_SINGLE;
3213 memset(&qc->sgent, 0, sizeof(qc->sgent));
3214 qc->__sg = &qc->sgent;
3216 qc->orig_n_elem = 1;
3220 sg_init_one(sg, buf, buflen);
3224 * ata_sg_init - Associate command with scatter-gather table.
3225 * @qc: Command to be associated
3226 * @sg: Scatter-gather table.
3227 * @n_elem: Number of elements in s/g table.
3229 * Initialize the data-related elements of queued_cmd @qc
3230 * to point to a scatter-gather table @sg, containing @n_elem
3234 * spin_lock_irqsave(host_set lock)
3237 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3238 unsigned int n_elem)
3240 qc->flags |= ATA_QCFLAG_SG;
3242 qc->n_elem = n_elem;
3243 qc->orig_n_elem = n_elem;
3247 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3248 * @qc: Command with memory buffer to be mapped.
3250 * DMA-map the memory buffer associated with queued_cmd @qc.
3253 * spin_lock_irqsave(host_set lock)
3256 * Zero on success, negative on error.
3259 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3261 struct ata_port *ap = qc->ap;
3262 int dir = qc->dma_dir;
3263 struct scatterlist *sg = qc->__sg;
3264 dma_addr_t dma_address;
3267 /* we must lengthen transfers to end on a 32-bit boundary */
3268 qc->pad_len = sg->length & 3;
3270 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3271 struct scatterlist *psg = &qc->pad_sgent;
3273 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3275 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3277 if (qc->tf.flags & ATA_TFLAG_WRITE)
3278 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3281 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3282 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3284 sg->length -= qc->pad_len;
3285 if (sg->length == 0)
3288 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3289 sg->length, qc->pad_len);
3297 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3299 if (dma_mapping_error(dma_address)) {
3301 sg->length += qc->pad_len;
3305 sg_dma_address(sg) = dma_address;
3306 sg_dma_len(sg) = sg->length;
3309 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3310 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3316 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3317 * @qc: Command with scatter-gather table to be mapped.
3319 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3322 * spin_lock_irqsave(host_set lock)
3325 * Zero on success, negative on error.
3329 static int ata_sg_setup(struct ata_queued_cmd *qc)
3331 struct ata_port *ap = qc->ap;
3332 struct scatterlist *sg = qc->__sg;
3333 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3334 int n_elem, pre_n_elem, dir, trim_sg = 0;
3336 VPRINTK("ENTER, ata%u\n", ap->id);
3337 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3339 /* we must lengthen transfers to end on a 32-bit boundary */
3340 qc->pad_len = lsg->length & 3;
3342 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3343 struct scatterlist *psg = &qc->pad_sgent;
3344 unsigned int offset;
3346 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3348 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3351 * psg->page/offset are used to copy to-be-written
3352 * data in this function or read data in ata_sg_clean.
3354 offset = lsg->offset + lsg->length - qc->pad_len;
3355 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3356 psg->offset = offset_in_page(offset);
3358 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3359 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3360 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3361 kunmap_atomic(addr, KM_IRQ0);
3364 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3365 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3367 lsg->length -= qc->pad_len;
3368 if (lsg->length == 0)
3371 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3372 qc->n_elem - 1, lsg->length, qc->pad_len);
3375 pre_n_elem = qc->n_elem;
3376 if (trim_sg && pre_n_elem)
3385 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3387 /* restore last sg */
3388 lsg->length += qc->pad_len;
3392 DPRINTK("%d sg elements mapped\n", n_elem);
3395 qc->n_elem = n_elem;
3401 * ata_poll_qc_complete - turn irq back on and finish qc
3402 * @qc: Command to complete
3403 * @err_mask: ATA status register content
3406 * None. (grabs host lock)
3409 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3411 struct ata_port *ap = qc->ap;
3412 unsigned long flags;
3414 spin_lock_irqsave(&ap->host_set->lock, flags);
3415 ap->flags &= ~ATA_FLAG_NOINTR;
3417 ata_qc_complete(qc);
3418 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3422 * ata_pio_poll - poll using PIO, depending on current state
3423 * @qc: qc in progress
3426 * None. (executing in kernel thread context)
3429 * timeout value to use
3431 static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
3433 struct ata_port *ap = qc->ap;
3435 unsigned int poll_state = HSM_ST_UNKNOWN;
3436 unsigned int reg_state = HSM_ST_UNKNOWN;
3438 switch (ap->hsm_task_state) {
3441 poll_state = HSM_ST_POLL;
3445 case HSM_ST_LAST_POLL:
3446 poll_state = HSM_ST_LAST_POLL;
3447 reg_state = HSM_ST_LAST;
3454 status = ata_chk_status(ap);
3455 if (status & ATA_BUSY) {
3456 if (time_after(jiffies, ap->pio_task_timeout)) {
3457 qc->err_mask |= AC_ERR_TIMEOUT;
3458 ap->hsm_task_state = HSM_ST_TMOUT;
3461 ap->hsm_task_state = poll_state;
3462 return ATA_SHORT_PAUSE;
3465 ap->hsm_task_state = reg_state;
3470 * ata_pio_complete - check if drive is busy or idle
3471 * @qc: qc to complete
3474 * None. (executing in kernel thread context)
3477 * Non-zero if qc completed, zero otherwise.
3479 static int ata_pio_complete(struct ata_queued_cmd *qc)
3481 struct ata_port *ap = qc->ap;
3485 * This is purely heuristic. This is a fast path. Sometimes when
3486 * we enter, BSY will be cleared in a chk-status or two. If not,
3487 * the drive is probably seeking or something. Snooze for a couple
3488 * msecs, then chk-status again. If still busy, fall back to
3489 * HSM_ST_POLL state.
3491 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3492 if (drv_stat & ATA_BUSY) {
3494 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3495 if (drv_stat & ATA_BUSY) {
3496 ap->hsm_task_state = HSM_ST_LAST_POLL;
3497 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3502 drv_stat = ata_wait_idle(ap);
3503 if (!ata_ok(drv_stat)) {
3504 qc->err_mask |= __ac_err_mask(drv_stat);
3505 ap->hsm_task_state = HSM_ST_ERR;
3509 ap->hsm_task_state = HSM_ST_IDLE;
3511 WARN_ON(qc->err_mask);
3512 ata_poll_qc_complete(qc);
3514 /* another command may start at this point */
3521 * swap_buf_le16 - swap halves of 16-bit words in place
3522 * @buf: Buffer to swap
3523 * @buf_words: Number of 16-bit words in buffer.
3525 * Swap halves of 16-bit words if needed to convert from
3526 * little-endian byte order to native cpu byte order, or
3530 * Inherited from caller.
3532 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3537 for (i = 0; i < buf_words; i++)
3538 buf[i] = le16_to_cpu(buf[i]);
3539 #endif /* __BIG_ENDIAN */
3543 * ata_mmio_data_xfer - Transfer data by MMIO
3544 * @ap: port to read/write
3546 * @buflen: buffer length
3547 * @write_data: read/write
3549 * Transfer data from/to the device data register by MMIO.
3552 * Inherited from caller.
3555 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3556 unsigned int buflen, int write_data)
3559 unsigned int words = buflen >> 1;
3560 u16 *buf16 = (u16 *) buf;
3561 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3563 /* Transfer multiple of 2 bytes */
3565 for (i = 0; i < words; i++)
3566 writew(le16_to_cpu(buf16[i]), mmio);
3568 for (i = 0; i < words; i++)
3569 buf16[i] = cpu_to_le16(readw(mmio));
3572 /* Transfer trailing 1 byte, if any. */
3573 if (unlikely(buflen & 0x01)) {
3574 u16 align_buf[1] = { 0 };
3575 unsigned char *trailing_buf = buf + buflen - 1;
3578 memcpy(align_buf, trailing_buf, 1);
3579 writew(le16_to_cpu(align_buf[0]), mmio);
3581 align_buf[0] = cpu_to_le16(readw(mmio));
3582 memcpy(trailing_buf, align_buf, 1);
3588 * ata_pio_data_xfer - Transfer data by PIO
3589 * @ap: port to read/write
3591 * @buflen: buffer length
3592 * @write_data: read/write
3594 * Transfer data from/to the device data register by PIO.
3597 * Inherited from caller.
3600 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3601 unsigned int buflen, int write_data)
3603 unsigned int words = buflen >> 1;
3605 /* Transfer multiple of 2 bytes */
3607 outsw(ap->ioaddr.data_addr, buf, words);
3609 insw(ap->ioaddr.data_addr, buf, words);
3611 /* Transfer trailing 1 byte, if any. */
3612 if (unlikely(buflen & 0x01)) {
3613 u16 align_buf[1] = { 0 };
3614 unsigned char *trailing_buf = buf + buflen - 1;
3617 memcpy(align_buf, trailing_buf, 1);
3618 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3620 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3621 memcpy(trailing_buf, align_buf, 1);
3627 * ata_data_xfer - Transfer data from/to the data register.
3628 * @ap: port to read/write
3630 * @buflen: buffer length
3631 * @do_write: read/write
3633 * Transfer data from/to the device data register.
3636 * Inherited from caller.
3639 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3640 unsigned int buflen, int do_write)
3642 /* Make the crap hardware pay the costs not the good stuff */
3643 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3644 unsigned long flags;
3645 local_irq_save(flags);
3646 if (ap->flags & ATA_FLAG_MMIO)
3647 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3649 ata_pio_data_xfer(ap, buf, buflen, do_write);
3650 local_irq_restore(flags);
3652 if (ap->flags & ATA_FLAG_MMIO)
3653 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3655 ata_pio_data_xfer(ap, buf, buflen, do_write);
3660 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3661 * @qc: Command on going
3663 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3666 * Inherited from caller.
3669 static void ata_pio_sector(struct ata_queued_cmd *qc)
3671 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3672 struct scatterlist *sg = qc->__sg;
3673 struct ata_port *ap = qc->ap;
3675 unsigned int offset;
3678 if (qc->cursect == (qc->nsect - 1))
3679 ap->hsm_task_state = HSM_ST_LAST;
3681 page = sg[qc->cursg].page;
3682 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3684 /* get the current page and offset */
3685 page = nth_page(page, (offset >> PAGE_SHIFT));
3686 offset %= PAGE_SIZE;
3688 buf = kmap(page) + offset;
3693 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3698 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3700 /* do the actual data transfer */
3701 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3702 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3708 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3709 * @qc: Command on going
3710 * @bytes: number of bytes
3712 * Transfer Transfer data from/to the ATAPI device.
3715 * Inherited from caller.
3719 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3721 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3722 struct scatterlist *sg = qc->__sg;
3723 struct ata_port *ap = qc->ap;
3726 unsigned int offset, count;
3728 if (qc->curbytes + bytes >= qc->nbytes)
3729 ap->hsm_task_state = HSM_ST_LAST;
3732 if (unlikely(qc->cursg >= qc->n_elem)) {
3734 * The end of qc->sg is reached and the device expects
3735 * more data to transfer. In order not to overrun qc->sg
3736 * and fulfill length specified in the byte count register,
3737 * - for read case, discard trailing data from the device
3738 * - for write case, padding zero data to the device
3740 u16 pad_buf[1] = { 0 };
3741 unsigned int words = bytes >> 1;
3744 if (words) /* warning if bytes > 1 */
3745 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3748 for (i = 0; i < words; i++)
3749 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3751 ap->hsm_task_state = HSM_ST_LAST;
3755 sg = &qc->__sg[qc->cursg];
3758 offset = sg->offset + qc->cursg_ofs;
3760 /* get the current page and offset */
3761 page = nth_page(page, (offset >> PAGE_SHIFT));
3762 offset %= PAGE_SIZE;
3764 /* don't overrun current sg */
3765 count = min(sg->length - qc->cursg_ofs, bytes);
3767 /* don't cross page boundaries */
3768 count = min(count, (unsigned int)PAGE_SIZE - offset);
3770 buf = kmap(page) + offset;
3773 qc->curbytes += count;
3774 qc->cursg_ofs += count;
3776 if (qc->cursg_ofs == sg->length) {
3781 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3783 /* do the actual data transfer */
3784 ata_data_xfer(ap, buf, count, do_write);
3793 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3794 * @qc: Command on going
3796 * Transfer Transfer data from/to the ATAPI device.
3799 * Inherited from caller.
3802 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3804 struct ata_port *ap = qc->ap;
3805 struct ata_device *dev = qc->dev;
3806 unsigned int ireason, bc_lo, bc_hi, bytes;
3807 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3809 ap->ops->tf_read(ap, &qc->tf);
3810 ireason = qc->tf.nsect;
3811 bc_lo = qc->tf.lbam;
3812 bc_hi = qc->tf.lbah;
3813 bytes = (bc_hi << 8) | bc_lo;
3815 /* shall be cleared to zero, indicating xfer of data */
3816 if (ireason & (1 << 0))
3819 /* make sure transfer direction matches expected */
3820 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3821 if (do_write != i_write)
3824 __atapi_pio_bytes(qc, bytes);
3829 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3830 ap->id, dev->devno);
3831 qc->err_mask |= AC_ERR_HSM;
3832 ap->hsm_task_state = HSM_ST_ERR;
3836 * ata_pio_block - start PIO on a block
3837 * @qc: qc to transfer block for
3840 * None. (executing in kernel thread context)
3842 static void ata_pio_block(struct ata_queued_cmd *qc)
3844 struct ata_port *ap = qc->ap;
3848 * This is purely heuristic. This is a fast path.
3849 * Sometimes when we enter, BSY will be cleared in
3850 * a chk-status or two. If not, the drive is probably seeking
3851 * or something. Snooze for a couple msecs, then
3852 * chk-status again. If still busy, fall back to
3853 * HSM_ST_POLL state.
3855 status = ata_busy_wait(ap, ATA_BUSY, 5);
3856 if (status & ATA_BUSY) {
3858 status = ata_busy_wait(ap, ATA_BUSY, 10);
3859 if (status & ATA_BUSY) {
3860 ap->hsm_task_state = HSM_ST_POLL;
3861 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3867 if (status & (ATA_ERR | ATA_DF)) {
3868 qc->err_mask |= AC_ERR_DEV;
3869 ap->hsm_task_state = HSM_ST_ERR;
3873 /* transfer data if any */
3874 if (is_atapi_taskfile(&qc->tf)) {
3875 /* DRQ=0 means no more data to transfer */
3876 if ((status & ATA_DRQ) == 0) {
3877 ap->hsm_task_state = HSM_ST_LAST;
3881 atapi_pio_bytes(qc);
3883 /* handle BSY=0, DRQ=0 as error */
3884 if ((status & ATA_DRQ) == 0) {
3885 qc->err_mask |= AC_ERR_HSM;
3886 ap->hsm_task_state = HSM_ST_ERR;
3894 static void ata_pio_error(struct ata_queued_cmd *qc)
3896 struct ata_port *ap = qc->ap;
3898 if (qc->tf.command != ATA_CMD_PACKET)
3899 printk(KERN_WARNING "ata%u: dev %u PIO error\n",
3900 ap->id, qc->dev->devno);
3902 /* make sure qc->err_mask is available to
3903 * know what's wrong and recover
3905 WARN_ON(qc->err_mask == 0);
3907 ap->hsm_task_state = HSM_ST_IDLE;
3909 ata_poll_qc_complete(qc);
3912 static void ata_pio_task(void *_data)
3914 struct ata_queued_cmd *qc = _data;
3915 struct ata_port *ap = qc->ap;
3916 unsigned long timeout;
3923 switch (ap->hsm_task_state) {
3932 qc_completed = ata_pio_complete(qc);
3936 case HSM_ST_LAST_POLL:
3937 timeout = ata_pio_poll(qc);
3947 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
3948 else if (!qc_completed)
3953 * atapi_packet_task - Write CDB bytes to hardware
3954 * @_data: qc in progress
3956 * When device has indicated its readiness to accept
3957 * a CDB, this function is called. Send the CDB.
3958 * If DMA is to be performed, exit immediately.
3959 * Otherwise, we are in polling mode, so poll
3960 * status under operation succeeds or fails.
3963 * Kernel thread context (may sleep)
3965 static void atapi_packet_task(void *_data)
3967 struct ata_queued_cmd *qc = _data;
3968 struct ata_port *ap = qc->ap;
3971 /* sleep-wait for BSY to clear */
3972 DPRINTK("busy wait\n");
3973 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3974 qc->err_mask |= AC_ERR_TIMEOUT;
3978 /* make sure DRQ is set */
3979 status = ata_chk_status(ap);
3980 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3981 qc->err_mask |= AC_ERR_HSM;
3986 DPRINTK("send cdb\n");
3987 WARN_ON(qc->dev->cdb_len < 12);
3989 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3990 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3991 unsigned long flags;
3993 /* Once we're done issuing command and kicking bmdma,
3994 * irq handler takes over. To not lose irq, we need
3995 * to clear NOINTR flag before sending cdb, but
3996 * interrupt handler shouldn't be invoked before we're
3997 * finished. Hence, the following locking.
3999 spin_lock_irqsave(&ap->host_set->lock, flags);
4000 ap->flags &= ~ATA_FLAG_NOINTR;
4001 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4002 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4003 ap->ops->bmdma_start(qc); /* initiate bmdma */
4004 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4006 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4008 /* PIO commands are handled by polling */
4009 ap->hsm_task_state = HSM_ST;
4010 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4016 ata_poll_qc_complete(qc);
4020 * ata_qc_new - Request an available ATA command, for queueing
4021 * @ap: Port associated with device @dev
4022 * @dev: Device from whom we request an available command structure
4028 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4030 struct ata_queued_cmd *qc = NULL;
4033 for (i = 0; i < ATA_MAX_QUEUE; i++)
4034 if (!test_and_set_bit(i, &ap->qactive)) {
4035 qc = ata_qc_from_tag(ap, i);
4046 * ata_qc_new_init - Request an available ATA command, and initialize it
4047 * @ap: Port associated with device @dev
4048 * @dev: Device from whom we request an available command structure
4054 struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
4055 struct ata_device *dev)
4057 struct ata_queued_cmd *qc;
4059 qc = ata_qc_new(ap);
4072 * ata_qc_free - free unused ata_queued_cmd
4073 * @qc: Command to complete
4075 * Designed to free unused ata_queued_cmd object
4076 * in case something prevents using it.
4079 * spin_lock_irqsave(host_set lock)
4081 void ata_qc_free(struct ata_queued_cmd *qc)
4083 struct ata_port *ap = qc->ap;
4086 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4090 if (likely(ata_tag_valid(tag))) {
4091 qc->tag = ATA_TAG_POISON;
4092 clear_bit(tag, &ap->qactive);
4096 void __ata_qc_complete(struct ata_queued_cmd *qc)
4098 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4099 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4101 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4104 /* command should be marked inactive atomically with qc completion */
4105 qc->ap->active_tag = ATA_TAG_POISON;
4107 /* atapi: mark qc as inactive to prevent the interrupt handler
4108 * from completing the command twice later, before the error handler
4109 * is called. (when rc != 0 and atapi request sense is needed)
4111 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4113 /* call completion callback */
4114 qc->complete_fn(qc);
4117 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4119 struct ata_port *ap = qc->ap;
4121 switch (qc->tf.protocol) {
4123 case ATA_PROT_ATAPI_DMA:
4126 case ATA_PROT_ATAPI:
4128 if (ap->flags & ATA_FLAG_PIO_DMA)
4141 * ata_qc_issue - issue taskfile to device
4142 * @qc: command to issue to device
4144 * Prepare an ATA command to submission to device.
4145 * This includes mapping the data into a DMA-able
4146 * area, filling in the S/G table, and finally
4147 * writing the taskfile to hardware, starting the command.
4150 * spin_lock_irqsave(host_set lock)
4152 void ata_qc_issue(struct ata_queued_cmd *qc)
4154 struct ata_port *ap = qc->ap;
4156 qc->ap->active_tag = qc->tag;
4157 qc->flags |= ATA_QCFLAG_ACTIVE;
4159 if (ata_should_dma_map(qc)) {
4160 if (qc->flags & ATA_QCFLAG_SG) {
4161 if (ata_sg_setup(qc))
4163 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4164 if (ata_sg_setup_one(qc))
4168 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4171 ap->ops->qc_prep(qc);
4173 qc->err_mask |= ap->ops->qc_issue(qc);
4174 if (unlikely(qc->err_mask))
4179 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4180 qc->err_mask |= AC_ERR_SYSTEM;
4182 ata_qc_complete(qc);
4186 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4187 * @qc: command to issue to device
4189 * Using various libata functions and hooks, this function
4190 * starts an ATA command. ATA commands are grouped into
4191 * classes called "protocols", and issuing each type of protocol
4192 * is slightly different.
4194 * May be used as the qc_issue() entry in ata_port_operations.
4197 * spin_lock_irqsave(host_set lock)
4200 * Zero on success, AC_ERR_* mask on failure
4203 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4205 struct ata_port *ap = qc->ap;
4207 ata_dev_select(ap, qc->dev->devno, 1, 0);
4209 switch (qc->tf.protocol) {
4210 case ATA_PROT_NODATA:
4211 ata_tf_to_host(ap, &qc->tf);
4215 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4216 ap->ops->bmdma_setup(qc); /* set up bmdma */
4217 ap->ops->bmdma_start(qc); /* initiate bmdma */
4220 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4221 ata_qc_set_polling(qc);
4222 ata_tf_to_host(ap, &qc->tf);
4223 ap->hsm_task_state = HSM_ST;
4224 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4227 case ATA_PROT_ATAPI:
4228 ata_qc_set_polling(qc);
4229 ata_tf_to_host(ap, &qc->tf);
4230 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4233 case ATA_PROT_ATAPI_NODATA:
4234 ap->flags |= ATA_FLAG_NOINTR;
4235 ata_tf_to_host(ap, &qc->tf);
4236 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4239 case ATA_PROT_ATAPI_DMA:
4240 ap->flags |= ATA_FLAG_NOINTR;
4241 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4242 ap->ops->bmdma_setup(qc); /* set up bmdma */
4243 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4248 return AC_ERR_SYSTEM;
4255 * ata_host_intr - Handle host interrupt for given (port, task)
4256 * @ap: Port on which interrupt arrived (possibly...)
4257 * @qc: Taskfile currently active in engine
4259 * Handle host interrupt for given queued command. Currently,
4260 * only DMA interrupts are handled. All other commands are
4261 * handled via polling with interrupts disabled (nIEN bit).
4264 * spin_lock_irqsave(host_set lock)
4267 * One if interrupt was handled, zero if not (shared irq).
4270 inline unsigned int ata_host_intr (struct ata_port *ap,
4271 struct ata_queued_cmd *qc)
4273 u8 status, host_stat;
4275 switch (qc->tf.protocol) {
4278 case ATA_PROT_ATAPI_DMA:
4279 case ATA_PROT_ATAPI:
4280 /* check status of DMA engine */
4281 host_stat = ap->ops->bmdma_status(ap);
4282 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4284 /* if it's not our irq... */
4285 if (!(host_stat & ATA_DMA_INTR))
4288 /* before we do anything else, clear DMA-Start bit */
4289 ap->ops->bmdma_stop(qc);
4293 case ATA_PROT_ATAPI_NODATA:
4294 case ATA_PROT_NODATA:
4295 /* check altstatus */
4296 status = ata_altstatus(ap);
4297 if (status & ATA_BUSY)
4300 /* check main status, clearing INTRQ */
4301 status = ata_chk_status(ap);
4302 if (unlikely(status & ATA_BUSY))
4304 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4305 ap->id, qc->tf.protocol, status);
4307 /* ack bmdma irq events */
4308 ap->ops->irq_clear(ap);
4310 /* complete taskfile transaction */
4311 qc->err_mask |= ac_err_mask(status);
4312 ata_qc_complete(qc);
4319 return 1; /* irq handled */
4322 ap->stats.idle_irq++;
4325 if ((ap->stats.idle_irq % 1000) == 0) {
4326 ata_irq_ack(ap, 0); /* debug trap */
4327 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4331 return 0; /* irq not handled */
4335 * ata_interrupt - Default ATA host interrupt handler
4336 * @irq: irq line (unused)
4337 * @dev_instance: pointer to our ata_host_set information structure
4340 * Default interrupt handler for PCI IDE devices. Calls
4341 * ata_host_intr() for each port that is not disabled.
4344 * Obtains host_set lock during operation.
4347 * IRQ_NONE or IRQ_HANDLED.
4350 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4352 struct ata_host_set *host_set = dev_instance;
4354 unsigned int handled = 0;
4355 unsigned long flags;
4357 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4358 spin_lock_irqsave(&host_set->lock, flags);
4360 for (i = 0; i < host_set->n_ports; i++) {
4361 struct ata_port *ap;
4363 ap = host_set->ports[i];
4365 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
4366 struct ata_queued_cmd *qc;
4368 qc = ata_qc_from_tag(ap, ap->active_tag);
4369 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4370 (qc->flags & ATA_QCFLAG_ACTIVE))
4371 handled |= ata_host_intr(ap, qc);
4375 spin_unlock_irqrestore(&host_set->lock, flags);
4377 return IRQ_RETVAL(handled);
4382 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4383 * without filling any other registers
4385 static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4388 struct ata_taskfile tf;
4391 ata_tf_init(ap, &tf, dev->devno);
4394 tf.flags |= ATA_TFLAG_DEVICE;
4395 tf.protocol = ATA_PROT_NODATA;
4397 err = ata_exec_internal(ap, dev, &tf, NULL, DMA_NONE, NULL, 0);
4399 printk(KERN_ERR "%s: ata command failed: %d\n",
4405 static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4409 if (!ata_try_flush_cache(dev))
4412 if (ata_id_has_flush_ext(dev->id))
4413 cmd = ATA_CMD_FLUSH_EXT;
4415 cmd = ATA_CMD_FLUSH;
4417 return ata_do_simple_cmd(ap, dev, cmd);
4420 static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4422 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4425 static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4427 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4431 * ata_device_resume - wakeup a previously suspended devices
4432 * @ap: port the device is connected to
4433 * @dev: the device to resume
4435 * Kick the drive back into action, by sending it an idle immediate
4436 * command and making sure its transfer mode matches between drive
4440 int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4442 if (ap->flags & ATA_FLAG_SUSPENDED) {
4443 struct ata_device *failed_dev;
4444 ap->flags &= ~ATA_FLAG_SUSPENDED;
4445 while (ata_set_mode(ap, &failed_dev))
4446 ata_dev_disable(ap, failed_dev);
4448 if (!ata_dev_enabled(dev))
4450 if (dev->class == ATA_DEV_ATA)
4451 ata_start_drive(ap, dev);
4457 * ata_device_suspend - prepare a device for suspend
4458 * @ap: port the device is connected to
4459 * @dev: the device to suspend
4461 * Flush the cache on the drive, if appropriate, then issue a
4462 * standbynow command.
4464 int ata_device_suspend(struct ata_port *ap, struct ata_device *dev, pm_message_t state)
4466 if (!ata_dev_enabled(dev))
4468 if (dev->class == ATA_DEV_ATA)
4469 ata_flush_cache(ap, dev);
4471 if (state.event != PM_EVENT_FREEZE)
4472 ata_standby_drive(ap, dev);
4473 ap->flags |= ATA_FLAG_SUSPENDED;
4478 * ata_port_start - Set port up for dma.
4479 * @ap: Port to initialize
4481 * Called just after data structures for each port are
4482 * initialized. Allocates space for PRD table.
4484 * May be used as the port_start() entry in ata_port_operations.
4487 * Inherited from caller.
4490 int ata_port_start (struct ata_port *ap)
4492 struct device *dev = ap->dev;
4495 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4499 rc = ata_pad_alloc(ap, dev);
4501 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4505 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4512 * ata_port_stop - Undo ata_port_start()
4513 * @ap: Port to shut down
4515 * Frees the PRD table.
4517 * May be used as the port_stop() entry in ata_port_operations.
4520 * Inherited from caller.
4523 void ata_port_stop (struct ata_port *ap)
4525 struct device *dev = ap->dev;
4527 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4528 ata_pad_free(ap, dev);
4531 void ata_host_stop (struct ata_host_set *host_set)
4533 if (host_set->mmio_base)
4534 iounmap(host_set->mmio_base);
4539 * ata_host_remove - Unregister SCSI host structure with upper layers
4540 * @ap: Port to unregister
4541 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4544 * Inherited from caller.
4547 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4549 struct Scsi_Host *sh = ap->host;
4554 scsi_remove_host(sh);
4556 ap->ops->port_stop(ap);
4560 * ata_host_init - Initialize an ata_port structure
4561 * @ap: Structure to initialize
4562 * @host: associated SCSI mid-layer structure
4563 * @host_set: Collection of hosts to which @ap belongs
4564 * @ent: Probe information provided by low-level driver
4565 * @port_no: Port number associated with this ata_port
4567 * Initialize a new ata_port structure, and its associated
4571 * Inherited from caller.
4574 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4575 struct ata_host_set *host_set,
4576 const struct ata_probe_ent *ent, unsigned int port_no)
4582 host->max_channel = 1;
4583 host->unique_id = ata_unique_id++;
4584 host->max_cmd_len = 12;
4586 ap->flags = ATA_FLAG_DISABLED;
4587 ap->id = host->unique_id;
4589 ap->ctl = ATA_DEVCTL_OBS;
4590 ap->host_set = host_set;
4592 ap->port_no = port_no;
4594 ent->legacy_mode ? ent->hard_port_no : port_no;
4595 ap->pio_mask = ent->pio_mask;
4596 ap->mwdma_mask = ent->mwdma_mask;
4597 ap->udma_mask = ent->udma_mask;
4598 ap->flags |= ent->host_flags;
4599 ap->ops = ent->port_ops;
4600 ap->cbl = ATA_CBL_NONE;
4601 ap->sata_spd_limit = UINT_MAX;
4602 ap->active_tag = ATA_TAG_POISON;
4603 ap->last_ctl = 0xFF;
4605 INIT_WORK(&ap->port_task, NULL, NULL);
4606 INIT_LIST_HEAD(&ap->eh_done_q);
4608 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4609 struct ata_device *dev = &ap->device[i];
4611 dev->pio_mask = UINT_MAX;
4612 dev->mwdma_mask = UINT_MAX;
4613 dev->udma_mask = UINT_MAX;
4617 ap->stats.unhandled_irq = 1;
4618 ap->stats.idle_irq = 1;
4621 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4625 * ata_host_add - Attach low-level ATA driver to system
4626 * @ent: Information provided by low-level driver
4627 * @host_set: Collections of ports to which we add
4628 * @port_no: Port number associated with this host
4630 * Attach low-level ATA driver to system.
4633 * PCI/etc. bus probe sem.
4636 * New ata_port on success, for NULL on error.
4639 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4640 struct ata_host_set *host_set,
4641 unsigned int port_no)
4643 struct Scsi_Host *host;
4644 struct ata_port *ap;
4649 if (!ent->port_ops->probe_reset &&
4650 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4651 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4656 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4660 host->transportt = &ata_scsi_transport_template;
4662 ap = ata_shost_to_port(host);
4664 ata_host_init(ap, host, host_set, ent, port_no);
4666 rc = ap->ops->port_start(ap);
4673 scsi_host_put(host);
4678 * ata_device_add - Register hardware device with ATA and SCSI layers
4679 * @ent: Probe information describing hardware device to be registered
4681 * This function processes the information provided in the probe
4682 * information struct @ent, allocates the necessary ATA and SCSI
4683 * host information structures, initializes them, and registers
4684 * everything with requisite kernel subsystems.
4686 * This function requests irqs, probes the ATA bus, and probes
4690 * PCI/etc. bus probe sem.
4693 * Number of ports registered. Zero on error (no ports registered).
4696 int ata_device_add(const struct ata_probe_ent *ent)
4698 unsigned int count = 0, i;
4699 struct device *dev = ent->dev;
4700 struct ata_host_set *host_set;
4703 /* alloc a container for our list of ATA ports (buses) */
4704 host_set = kzalloc(sizeof(struct ata_host_set) +
4705 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4708 spin_lock_init(&host_set->lock);
4710 host_set->dev = dev;
4711 host_set->n_ports = ent->n_ports;
4712 host_set->irq = ent->irq;
4713 host_set->mmio_base = ent->mmio_base;
4714 host_set->private_data = ent->private_data;
4715 host_set->ops = ent->port_ops;
4716 host_set->flags = ent->host_set_flags;
4718 /* register each port bound to this device */
4719 for (i = 0; i < ent->n_ports; i++) {
4720 struct ata_port *ap;
4721 unsigned long xfer_mode_mask;
4723 ap = ata_host_add(ent, host_set, i);
4727 host_set->ports[i] = ap;
4728 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4729 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4730 (ap->pio_mask << ATA_SHIFT_PIO);
4732 /* print per-port info to dmesg */
4733 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4734 "bmdma 0x%lX irq %lu\n",
4736 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4737 ata_mode_string(xfer_mode_mask),
4738 ap->ioaddr.cmd_addr,
4739 ap->ioaddr.ctl_addr,
4740 ap->ioaddr.bmdma_addr,
4744 host_set->ops->irq_clear(ap);
4751 /* obtain irq, that is shared between channels */
4752 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4753 DRV_NAME, host_set))
4756 /* perform each probe synchronously */
4757 DPRINTK("probe begin\n");
4758 for (i = 0; i < count; i++) {
4759 struct ata_port *ap;
4762 ap = host_set->ports[i];
4764 DPRINTK("ata%u: bus probe begin\n", ap->id);
4765 rc = ata_bus_probe(ap);
4766 DPRINTK("ata%u: bus probe end\n", ap->id);
4769 /* FIXME: do something useful here?
4770 * Current libata behavior will
4771 * tear down everything when
4772 * the module is removed
4773 * or the h/w is unplugged.
4777 rc = scsi_add_host(ap->host, dev);
4779 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4781 /* FIXME: do something useful here */
4782 /* FIXME: handle unconditional calls to
4783 * scsi_scan_host and ata_host_remove, below,
4789 /* probes are done, now scan each port's disk(s) */
4790 DPRINTK("host probe begin\n");
4791 for (i = 0; i < count; i++) {
4792 struct ata_port *ap = host_set->ports[i];
4794 ata_scsi_scan_host(ap);
4797 dev_set_drvdata(dev, host_set);
4799 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4800 return ent->n_ports; /* success */
4803 for (i = 0; i < count; i++) {
4804 ata_host_remove(host_set->ports[i], 1);
4805 scsi_host_put(host_set->ports[i]->host);
4809 VPRINTK("EXIT, returning 0\n");
4814 * ata_host_set_remove - PCI layer callback for device removal
4815 * @host_set: ATA host set that was removed
4817 * Unregister all objects associated with this host set. Free those
4821 * Inherited from calling layer (may sleep).
4824 void ata_host_set_remove(struct ata_host_set *host_set)
4826 struct ata_port *ap;
4829 for (i = 0; i < host_set->n_ports; i++) {
4830 ap = host_set->ports[i];
4831 scsi_remove_host(ap->host);
4834 free_irq(host_set->irq, host_set);
4836 for (i = 0; i < host_set->n_ports; i++) {
4837 ap = host_set->ports[i];
4839 ata_scsi_release(ap->host);
4841 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4842 struct ata_ioports *ioaddr = &ap->ioaddr;
4844 if (ioaddr->cmd_addr == 0x1f0)
4845 release_region(0x1f0, 8);
4846 else if (ioaddr->cmd_addr == 0x170)
4847 release_region(0x170, 8);
4850 scsi_host_put(ap->host);
4853 if (host_set->ops->host_stop)
4854 host_set->ops->host_stop(host_set);
4860 * ata_scsi_release - SCSI layer callback hook for host unload
4861 * @host: libata host to be unloaded
4863 * Performs all duties necessary to shut down a libata port...
4864 * Kill port kthread, disable port, and release resources.
4867 * Inherited from SCSI layer.
4873 int ata_scsi_release(struct Scsi_Host *host)
4875 struct ata_port *ap = ata_shost_to_port(host);
4880 ap->ops->port_disable(ap);
4881 ata_host_remove(ap, 0);
4882 for (i = 0; i < ATA_MAX_DEVICES; i++)
4883 kfree(ap->device[i].id);
4890 * ata_std_ports - initialize ioaddr with standard port offsets.
4891 * @ioaddr: IO address structure to be initialized
4893 * Utility function which initializes data_addr, error_addr,
4894 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4895 * device_addr, status_addr, and command_addr to standard offsets
4896 * relative to cmd_addr.
4898 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4901 void ata_std_ports(struct ata_ioports *ioaddr)
4903 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4904 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4905 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4906 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4907 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4908 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4909 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4910 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4911 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4912 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4918 void ata_pci_host_stop (struct ata_host_set *host_set)
4920 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4922 pci_iounmap(pdev, host_set->mmio_base);
4926 * ata_pci_remove_one - PCI layer callback for device removal
4927 * @pdev: PCI device that was removed
4929 * PCI layer indicates to libata via this hook that
4930 * hot-unplug or module unload event has occurred.
4931 * Handle this by unregistering all objects associated
4932 * with this PCI device. Free those objects. Then finally
4933 * release PCI resources and disable device.
4936 * Inherited from PCI layer (may sleep).
4939 void ata_pci_remove_one (struct pci_dev *pdev)
4941 struct device *dev = pci_dev_to_dev(pdev);
4942 struct ata_host_set *host_set = dev_get_drvdata(dev);
4944 ata_host_set_remove(host_set);
4945 pci_release_regions(pdev);
4946 pci_disable_device(pdev);
4947 dev_set_drvdata(dev, NULL);
4950 /* move to PCI subsystem */
4951 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
4953 unsigned long tmp = 0;
4955 switch (bits->width) {
4958 pci_read_config_byte(pdev, bits->reg, &tmp8);
4964 pci_read_config_word(pdev, bits->reg, &tmp16);
4970 pci_read_config_dword(pdev, bits->reg, &tmp32);
4981 return (tmp == bits->val) ? 1 : 0;
4984 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4986 pci_save_state(pdev);
4987 pci_disable_device(pdev);
4988 pci_set_power_state(pdev, PCI_D3hot);
4992 int ata_pci_device_resume(struct pci_dev *pdev)
4994 pci_set_power_state(pdev, PCI_D0);
4995 pci_restore_state(pdev);
4996 pci_enable_device(pdev);
4997 pci_set_master(pdev);
5000 #endif /* CONFIG_PCI */
5003 static int __init ata_init(void)
5005 ata_wq = create_workqueue("ata");
5009 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5013 static void __exit ata_exit(void)
5015 destroy_workqueue(ata_wq);
5018 module_init(ata_init);
5019 module_exit(ata_exit);
5021 static unsigned long ratelimit_time;
5022 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5024 int ata_ratelimit(void)
5027 unsigned long flags;
5029 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5031 if (time_after(jiffies, ratelimit_time)) {
5033 ratelimit_time = jiffies + (HZ/5);
5037 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5043 * ata_wait_register - wait until register value changes
5044 * @reg: IO-mapped register
5045 * @mask: Mask to apply to read register value
5046 * @val: Wait condition
5047 * @interval_msec: polling interval in milliseconds
5048 * @timeout_msec: timeout in milliseconds
5050 * Waiting for some bits of register to change is a common
5051 * operation for ATA controllers. This function reads 32bit LE
5052 * IO-mapped register @reg and tests for the following condition.
5054 * (*@reg & mask) != val
5056 * If the condition is met, it returns; otherwise, the process is
5057 * repeated after @interval_msec until timeout.
5060 * Kernel thread context (may sleep)
5063 * The final register value.
5065 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5066 unsigned long interval_msec,
5067 unsigned long timeout_msec)
5069 unsigned long timeout;
5072 tmp = ioread32(reg);
5074 /* Calculate timeout _after_ the first read to make sure
5075 * preceding writes reach the controller before starting to
5076 * eat away the timeout.
5078 timeout = jiffies + (timeout_msec * HZ) / 1000;
5080 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5081 msleep(interval_msec);
5082 tmp = ioread32(reg);
5089 * libata is essentially a library of internal helper functions for
5090 * low-level ATA host controller drivers. As such, the API/ABI is
5091 * likely to change as new drivers are added and updated.
5092 * Do not depend on ABI/API stability.
5095 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5096 EXPORT_SYMBOL_GPL(ata_std_ports);
5097 EXPORT_SYMBOL_GPL(ata_device_add);
5098 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5099 EXPORT_SYMBOL_GPL(ata_sg_init);
5100 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5101 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5102 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5103 EXPORT_SYMBOL_GPL(ata_tf_load);
5104 EXPORT_SYMBOL_GPL(ata_tf_read);
5105 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5106 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5107 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5108 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5109 EXPORT_SYMBOL_GPL(ata_check_status);
5110 EXPORT_SYMBOL_GPL(ata_altstatus);
5111 EXPORT_SYMBOL_GPL(ata_exec_command);
5112 EXPORT_SYMBOL_GPL(ata_port_start);
5113 EXPORT_SYMBOL_GPL(ata_port_stop);
5114 EXPORT_SYMBOL_GPL(ata_host_stop);
5115 EXPORT_SYMBOL_GPL(ata_interrupt);
5116 EXPORT_SYMBOL_GPL(ata_qc_prep);
5117 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5118 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5119 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5120 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5121 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5122 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5123 EXPORT_SYMBOL_GPL(ata_port_probe);
5124 EXPORT_SYMBOL_GPL(sata_set_spd);
5125 EXPORT_SYMBOL_GPL(sata_phy_reset);
5126 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5127 EXPORT_SYMBOL_GPL(ata_bus_reset);
5128 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5129 EXPORT_SYMBOL_GPL(ata_std_softreset);
5130 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5131 EXPORT_SYMBOL_GPL(ata_std_postreset);
5132 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5133 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5134 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5135 EXPORT_SYMBOL_GPL(ata_dev_classify);
5136 EXPORT_SYMBOL_GPL(ata_dev_pair);
5137 EXPORT_SYMBOL_GPL(ata_port_disable);
5138 EXPORT_SYMBOL_GPL(ata_ratelimit);
5139 EXPORT_SYMBOL_GPL(ata_wait_register);
5140 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5141 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5142 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5143 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5144 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5145 EXPORT_SYMBOL_GPL(ata_scsi_release);
5146 EXPORT_SYMBOL_GPL(ata_host_intr);
5147 EXPORT_SYMBOL_GPL(ata_id_string);
5148 EXPORT_SYMBOL_GPL(ata_id_c_string);
5149 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5151 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5152 EXPORT_SYMBOL_GPL(ata_timing_compute);
5153 EXPORT_SYMBOL_GPL(ata_timing_merge);
5156 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5157 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5158 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5159 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5160 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5161 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5162 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5163 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5164 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5165 #endif /* CONFIG_PCI */
5167 EXPORT_SYMBOL_GPL(ata_device_suspend);
5168 EXPORT_SYMBOL_GPL(ata_device_resume);
5169 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5170 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5172 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5173 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5174 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);