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_device *dev,
65 u16 heads, u16 sectors);
66 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
67 static void ata_dev_xfermask(struct ata_device *dev);
69 static unsigned int ata_unique_id = 1;
70 static struct workqueue_struct *ata_wq;
72 int atapi_enabled = 1;
73 module_param(atapi_enabled, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua, libata_fua, int, 0444);
82 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
105 fis[0] = 0x27; /* Register - Host to Device FIS */
106 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis[2] = tf->command;
109 fis[3] = tf->feature;
116 fis[8] = tf->hob_lbal;
117 fis[9] = tf->hob_lbam;
118 fis[10] = tf->hob_lbah;
119 fis[11] = tf->hob_feature;
122 fis[13] = tf->hob_nsect;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
145 tf->command = fis[2]; /* status */
146 tf->feature = fis[3]; /* error */
153 tf->hob_lbal = fis[8];
154 tf->hob_lbam = fis[9];
155 tf->hob_lbah = fis[10];
158 tf->hob_nsect = fis[13];
161 static const u8 ata_rw_cmds[] = {
165 ATA_CMD_READ_MULTI_EXT,
166 ATA_CMD_WRITE_MULTI_EXT,
170 ATA_CMD_WRITE_MULTI_FUA_EXT,
174 ATA_CMD_PIO_READ_EXT,
175 ATA_CMD_PIO_WRITE_EXT,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
203 struct ata_taskfile *tf = &qc->tf;
204 struct ata_device *dev = qc->dev;
207 int index, fua, lba48, write;
209 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
210 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
211 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
213 if (dev->flags & ATA_DFLAG_PIO) {
214 tf->protocol = ATA_PROT_PIO;
215 index = dev->multi_count ? 0 : 8;
216 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
217 /* Unable to use DMA due to host limitation */
218 tf->protocol = ATA_PROT_PIO;
219 index = dev->multi_count ? 0 : 8;
221 tf->protocol = ATA_PROT_DMA;
225 cmd = ata_rw_cmds[index + fua + lba48 + write];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
249 unsigned int mwdma_mask,
250 unsigned int udma_mask)
252 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
253 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
254 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask,
268 unsigned int *pio_mask,
269 unsigned int *mwdma_mask,
270 unsigned int *udma_mask)
273 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
275 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
277 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
280 static const struct ata_xfer_ent {
284 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
285 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
286 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
305 int highbit = fls(xfer_mask) - 1;
306 const struct ata_xfer_ent *ent;
308 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
309 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
310 return ent->base + highbit - ent->shift;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
328 const struct ata_xfer_ent *ent;
330 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
331 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
332 return 1 << (ent->shift + xfer_mode - ent->base);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode)
350 const struct ata_xfer_ent *ent;
352 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
353 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask)
374 static const char * const xfer_mode_str[] = {
394 highbit = fls(xfer_mask) - 1;
395 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
396 return xfer_mode_str[highbit];
400 static const char *sata_spd_string(unsigned int spd)
402 static const char * const spd_str[] = {
407 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
409 return spd_str[spd - 1];
412 void ata_dev_disable(struct ata_device *dev)
414 if (ata_dev_enabled(dev)) {
415 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port *ap,
441 struct ata_ioports *ioaddr = &ap->ioaddr;
444 ap->ops->dev_select(ap, device);
446 outb(0x55, ioaddr->nsect_addr);
447 outb(0xaa, ioaddr->lbal_addr);
449 outb(0xaa, ioaddr->nsect_addr);
450 outb(0x55, ioaddr->lbal_addr);
452 outb(0x55, ioaddr->nsect_addr);
453 outb(0xaa, ioaddr->lbal_addr);
455 nsect = inb(ioaddr->nsect_addr);
456 lbal = inb(ioaddr->lbal_addr);
458 if ((nsect == 0x55) && (lbal == 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port *ap,
485 struct ata_ioports *ioaddr = &ap->ioaddr;
488 ap->ops->dev_select(ap, device);
490 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
491 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
493 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
494 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
496 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
497 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
499 nsect = readb((void __iomem *) ioaddr->nsect_addr);
500 lbal = readb((void __iomem *) ioaddr->lbal_addr);
502 if ((nsect == 0x55) && (lbal == 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port *ap,
524 if (ap->flags & ATA_FLAG_MMIO)
525 return ata_mmio_devchk(ap, device);
526 return ata_pio_devchk(ap, device);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
553 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
559 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
593 struct ata_taskfile tf;
597 ap->ops->dev_select(ap, device);
599 memset(&tf, 0, sizeof(tf));
601 ap->ops->tf_read(ap, &tf);
606 /* see if device passed diags */
609 else if ((device == 0) && (err == 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf);
617 if (class == ATA_DEV_UNKNOWN)
619 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16 *id, unsigned char *s,
640 unsigned int ofs, unsigned int len)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16 *id, unsigned char *s,
673 unsigned int ofs, unsigned int len)
679 ata_id_string(id, s, ofs, len - 1);
681 p = s + strnlen(s, len - 1);
682 while (p > s && p[-1] == ' ')
687 static u64 ata_id_n_sectors(const u16 *id)
689 if (ata_id_has_lba(id)) {
690 if (ata_id_has_lba48(id))
691 return ata_id_u64(id, 100);
693 return ata_id_u32(id, 60);
695 if (ata_id_current_chs_valid(id))
696 return ata_id_u32(id, 57);
698 return id[1] * id[3] * id[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
739 tmp = ATA_DEVICE_OBS;
741 tmp = ATA_DEVICE_OBS | ATA_DEV1;
743 if (ap->flags & ATA_FLAG_MMIO) {
744 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
746 outb(tmp, ap->ioaddr.device_addr);
748 ata_pause(ap); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port *ap, unsigned int device,
771 unsigned int wait, unsigned int can_sleep)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap->id, device, wait);
779 ap->ops->dev_select(ap, device);
782 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16 *id)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16 *id)
844 unsigned int pio_mask, mwdma_mask, udma_mask;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
848 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
869 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
870 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
872 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
896 if (ap->flags & ATA_FLAG_FLUSH_PORT_TASK)
899 PREPARE_WORK(&ap->port_task, fn, data);
902 rc = queue_work(ata_wq, &ap->port_task);
904 rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port *ap)
926 spin_lock_irqsave(&ap->host_set->lock, flags);
927 ap->flags |= ATA_FLAG_FLUSH_PORT_TASK;
928 spin_unlock_irqrestore(&ap->host_set->lock, flags);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap->port_task)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq);
943 spin_lock_irqsave(&ap->host_set->lock, flags);
944 ap->flags &= ~ATA_FLAG_FLUSH_PORT_TASK;
945 spin_unlock_irqrestore(&ap->host_set->lock, flags);
950 void ata_qc_complete_internal(struct ata_queued_cmd *qc)
952 struct completion *waiting = qc->private_data;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device *dev,
977 struct ata_taskfile *tf, const u8 *cdb,
978 int dma_dir, void *buf, unsigned int buflen)
980 struct ata_port *ap = dev->ap;
981 u8 command = tf->command;
982 struct ata_queued_cmd *qc;
983 DECLARE_COMPLETION(wait);
985 unsigned int err_mask;
987 spin_lock_irqsave(&ap->host_set->lock, flags);
989 qc = ata_qc_new_init(dev);
994 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
995 qc->flags |= ATA_QCFLAG_RESULT_TF;
996 qc->dma_dir = dma_dir;
997 if (dma_dir != DMA_NONE) {
998 ata_sg_init_one(qc, buf, buflen);
999 qc->nsect = buflen / ATA_SECT_SIZE;
1002 qc->private_data = &wait;
1003 qc->complete_fn = ata_qc_complete_internal;
1007 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1009 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
1010 ata_port_flush_task(ap);
1012 spin_lock_irqsave(&ap->host_set->lock, flags);
1014 /* We're racing with irq here. If we lose, the
1015 * following test prevents us from completing the qc
1016 * again. If completion irq occurs after here but
1017 * before the caller cleans up, it will result in a
1018 * spurious interrupt. We can live with that.
1020 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1021 qc->err_mask = AC_ERR_TIMEOUT;
1022 ata_qc_complete(qc);
1024 ata_dev_printk(dev, KERN_WARNING,
1025 "qc timeout (cmd 0x%x)\n", command);
1028 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1032 spin_lock_irqsave(&ap->host_set->lock, flags);
1034 *tf = qc->result_tf;
1035 err_mask = qc->err_mask;
1039 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1040 * Until those drivers are fixed, we detect the condition
1041 * here, fail the command with AC_ERR_SYSTEM and reenable the
1044 * Note that this doesn't change any behavior as internal
1045 * command failure results in disabling the device in the
1046 * higher layer for LLDDs without new reset/EH callbacks.
1048 * Kill the following code as soon as those drivers are fixed.
1050 if (ap->flags & ATA_FLAG_DISABLED) {
1051 err_mask |= AC_ERR_SYSTEM;
1055 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1061 * ata_pio_need_iordy - check if iordy needed
1064 * Check if the current speed of the device requires IORDY. Used
1065 * by various controllers for chip configuration.
1068 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1071 int speed = adev->pio_mode - XFER_PIO_0;
1078 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1080 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1081 pio = adev->id[ATA_ID_EIDE_PIO];
1082 /* Is the speed faster than the drive allows non IORDY ? */
1084 /* This is cycle times not frequency - watch the logic! */
1085 if (pio > 240) /* PIO2 is 240nS per cycle */
1094 * ata_dev_read_id - Read ID data from the specified device
1095 * @dev: target device
1096 * @p_class: pointer to class of the target device (may be changed)
1097 * @post_reset: is this read ID post-reset?
1098 * @id: buffer to read IDENTIFY data into
1100 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1101 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1102 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1103 * for pre-ATA4 drives.
1106 * Kernel thread context (may sleep)
1109 * 0 on success, -errno otherwise.
1111 static int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1112 int post_reset, u16 *id)
1114 struct ata_port *ap = dev->ap;
1115 unsigned int class = *p_class;
1116 struct ata_taskfile tf;
1117 unsigned int err_mask = 0;
1121 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1123 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1126 ata_tf_init(dev, &tf);
1130 tf.command = ATA_CMD_ID_ATA;
1133 tf.command = ATA_CMD_ID_ATAPI;
1137 reason = "unsupported class";
1141 tf.protocol = ATA_PROT_PIO;
1143 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1144 id, sizeof(id[0]) * ATA_ID_WORDS);
1147 reason = "I/O error";
1151 swap_buf_le16(id, ATA_ID_WORDS);
1154 if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
1156 reason = "device reports illegal type";
1160 if (post_reset && class == ATA_DEV_ATA) {
1162 * The exact sequence expected by certain pre-ATA4 drives is:
1165 * INITIALIZE DEVICE PARAMETERS
1167 * Some drives were very specific about that exact sequence.
1169 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1170 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1173 reason = "INIT_DEV_PARAMS failed";
1177 /* current CHS translation info (id[53-58]) might be
1178 * changed. reread the identify device info.
1190 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1191 "(%s, err_mask=0x%x)\n", reason, err_mask);
1195 static inline u8 ata_dev_knobble(struct ata_device *dev)
1197 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1201 * ata_dev_configure - Configure the specified ATA/ATAPI device
1202 * @dev: Target device to configure
1203 * @print_info: Enable device info printout
1205 * Configure @dev according to @dev->id. Generic and low-level
1206 * driver specific fixups are also applied.
1209 * Kernel thread context (may sleep)
1212 * 0 on success, -errno otherwise
1214 static int ata_dev_configure(struct ata_device *dev, int print_info)
1216 struct ata_port *ap = dev->ap;
1217 const u16 *id = dev->id;
1218 unsigned int xfer_mask;
1221 if (!ata_dev_enabled(dev)) {
1222 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1223 ap->id, dev->devno);
1227 DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
1229 /* print device capabilities */
1231 ata_dev_printk(dev, KERN_DEBUG, "cfg 49:%04x 82:%04x 83:%04x "
1232 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1233 id[49], id[82], id[83], id[84],
1234 id[85], id[86], id[87], id[88]);
1236 /* initialize to-be-configured parameters */
1237 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1238 dev->max_sectors = 0;
1246 * common ATA, ATAPI feature tests
1249 /* find max transfer mode; for printk only */
1250 xfer_mask = ata_id_xfermask(id);
1254 /* ATA-specific feature tests */
1255 if (dev->class == ATA_DEV_ATA) {
1256 dev->n_sectors = ata_id_n_sectors(id);
1258 if (ata_id_has_lba(id)) {
1259 const char *lba_desc;
1262 dev->flags |= ATA_DFLAG_LBA;
1263 if (ata_id_has_lba48(id)) {
1264 dev->flags |= ATA_DFLAG_LBA48;
1268 /* print device info to dmesg */
1270 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1271 "max %s, %Lu sectors: %s\n",
1272 ata_id_major_version(id),
1273 ata_mode_string(xfer_mask),
1274 (unsigned long long)dev->n_sectors,
1279 /* Default translation */
1280 dev->cylinders = id[1];
1282 dev->sectors = id[6];
1284 if (ata_id_current_chs_valid(id)) {
1285 /* Current CHS translation is valid. */
1286 dev->cylinders = id[54];
1287 dev->heads = id[55];
1288 dev->sectors = id[56];
1291 /* print device info to dmesg */
1293 ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
1294 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1295 ata_id_major_version(id),
1296 ata_mode_string(xfer_mask),
1297 (unsigned long long)dev->n_sectors,
1298 dev->cylinders, dev->heads, dev->sectors);
1304 /* ATAPI-specific feature tests */
1305 else if (dev->class == ATA_DEV_ATAPI) {
1306 rc = atapi_cdb_len(id);
1307 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1308 ata_dev_printk(dev, KERN_WARNING,
1309 "unsupported CDB len\n");
1313 dev->cdb_len = (unsigned int) rc;
1315 /* print device info to dmesg */
1317 ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s\n",
1318 ata_mode_string(xfer_mask));
1321 ap->host->max_cmd_len = 0;
1322 for (i = 0; i < ATA_MAX_DEVICES; i++)
1323 ap->host->max_cmd_len = max_t(unsigned int,
1324 ap->host->max_cmd_len,
1325 ap->device[i].cdb_len);
1327 /* limit bridge transfers to udma5, 200 sectors */
1328 if (ata_dev_knobble(dev)) {
1330 ata_dev_printk(dev, KERN_INFO,
1331 "applying bridge limits\n");
1332 dev->udma_mask &= ATA_UDMA5;
1333 dev->max_sectors = ATA_MAX_SECTORS;
1336 if (ap->ops->dev_config)
1337 ap->ops->dev_config(ap, dev);
1339 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1343 DPRINTK("EXIT, err\n");
1348 * ata_bus_probe - Reset and probe ATA bus
1351 * Master ATA bus probing function. Initiates a hardware-dependent
1352 * bus reset, then attempts to identify any devices found on
1356 * PCI/etc. bus probe sem.
1359 * Zero on success, negative errno otherwise.
1362 static int ata_bus_probe(struct ata_port *ap)
1364 unsigned int classes[ATA_MAX_DEVICES];
1365 int tries[ATA_MAX_DEVICES];
1366 int i, rc, down_xfermask;
1367 struct ata_device *dev;
1371 for (i = 0; i < ATA_MAX_DEVICES; i++)
1372 tries[i] = ATA_PROBE_MAX_TRIES;
1377 /* reset and determine device classes */
1378 for (i = 0; i < ATA_MAX_DEVICES; i++)
1379 classes[i] = ATA_DEV_UNKNOWN;
1381 if (ap->ops->probe_reset) {
1382 rc = ap->ops->probe_reset(ap, classes);
1384 ata_port_printk(ap, KERN_ERR,
1385 "reset failed (errno=%d)\n", rc);
1389 ap->ops->phy_reset(ap);
1391 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1392 if (!(ap->flags & ATA_FLAG_DISABLED))
1393 classes[i] = ap->device[i].class;
1394 ap->device[i].class = ATA_DEV_UNKNOWN;
1400 for (i = 0; i < ATA_MAX_DEVICES; i++)
1401 if (classes[i] == ATA_DEV_UNKNOWN)
1402 classes[i] = ATA_DEV_NONE;
1404 /* read IDENTIFY page and configure devices */
1405 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1406 dev = &ap->device[i];
1409 dev->class = classes[i];
1411 if (!ata_dev_enabled(dev))
1414 rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
1418 rc = ata_dev_configure(dev, 1);
1423 /* configure transfer mode */
1424 rc = ata_set_mode(ap, &dev);
1430 for (i = 0; i < ATA_MAX_DEVICES; i++)
1431 if (ata_dev_enabled(&ap->device[i]))
1434 /* no device present, disable port */
1435 ata_port_disable(ap);
1436 ap->ops->port_disable(ap);
1443 tries[dev->devno] = 0;
1446 sata_down_spd_limit(ap);
1449 tries[dev->devno]--;
1450 if (down_xfermask &&
1451 ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1452 tries[dev->devno] = 0;
1455 if (!tries[dev->devno]) {
1456 ata_down_xfermask_limit(dev, 1);
1457 ata_dev_disable(dev);
1464 * ata_port_probe - Mark port as enabled
1465 * @ap: Port for which we indicate enablement
1467 * Modify @ap data structure such that the system
1468 * thinks that the entire port is enabled.
1470 * LOCKING: host_set lock, or some other form of
1474 void ata_port_probe(struct ata_port *ap)
1476 ap->flags &= ~ATA_FLAG_DISABLED;
1480 * sata_print_link_status - Print SATA link status
1481 * @ap: SATA port to printk link status about
1483 * This function prints link speed and status of a SATA link.
1488 static void sata_print_link_status(struct ata_port *ap)
1490 u32 sstatus, scontrol, tmp;
1492 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1494 sata_scr_read(ap, SCR_CONTROL, &scontrol);
1496 if (ata_port_online(ap)) {
1497 tmp = (sstatus >> 4) & 0xf;
1498 ata_port_printk(ap, KERN_INFO,
1499 "SATA link up %s (SStatus %X SControl %X)\n",
1500 sata_spd_string(tmp), sstatus, scontrol);
1502 ata_port_printk(ap, KERN_INFO,
1503 "SATA link down (SStatus %X SControl %X)\n",
1509 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1510 * @ap: SATA port associated with target SATA PHY.
1512 * This function issues commands to standard SATA Sxxx
1513 * PHY registers, to wake up the phy (and device), and
1514 * clear any reset condition.
1517 * PCI/etc. bus probe sem.
1520 void __sata_phy_reset(struct ata_port *ap)
1523 unsigned long timeout = jiffies + (HZ * 5);
1525 if (ap->flags & ATA_FLAG_SATA_RESET) {
1526 /* issue phy wake/reset */
1527 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1528 /* Couldn't find anything in SATA I/II specs, but
1529 * AHCI-1.1 10.4.2 says at least 1 ms. */
1532 /* phy wake/clear reset */
1533 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
1535 /* wait for phy to become ready, if necessary */
1538 sata_scr_read(ap, SCR_STATUS, &sstatus);
1539 if ((sstatus & 0xf) != 1)
1541 } while (time_before(jiffies, timeout));
1543 /* print link status */
1544 sata_print_link_status(ap);
1546 /* TODO: phy layer with polling, timeouts, etc. */
1547 if (!ata_port_offline(ap))
1550 ata_port_disable(ap);
1552 if (ap->flags & ATA_FLAG_DISABLED)
1555 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1556 ata_port_disable(ap);
1560 ap->cbl = ATA_CBL_SATA;
1564 * sata_phy_reset - Reset SATA bus.
1565 * @ap: SATA port associated with target SATA PHY.
1567 * This function resets the SATA bus, and then probes
1568 * the bus for devices.
1571 * PCI/etc. bus probe sem.
1574 void sata_phy_reset(struct ata_port *ap)
1576 __sata_phy_reset(ap);
1577 if (ap->flags & ATA_FLAG_DISABLED)
1583 * ata_dev_pair - return other device on cable
1586 * Obtain the other device on the same cable, or if none is
1587 * present NULL is returned
1590 struct ata_device *ata_dev_pair(struct ata_device *adev)
1592 struct ata_port *ap = adev->ap;
1593 struct ata_device *pair = &ap->device[1 - adev->devno];
1594 if (!ata_dev_enabled(pair))
1600 * ata_port_disable - Disable port.
1601 * @ap: Port to be disabled.
1603 * Modify @ap data structure such that the system
1604 * thinks that the entire port is disabled, and should
1605 * never attempt to probe or communicate with devices
1608 * LOCKING: host_set lock, or some other form of
1612 void ata_port_disable(struct ata_port *ap)
1614 ap->device[0].class = ATA_DEV_NONE;
1615 ap->device[1].class = ATA_DEV_NONE;
1616 ap->flags |= ATA_FLAG_DISABLED;
1620 * sata_down_spd_limit - adjust SATA spd limit downward
1621 * @ap: Port to adjust SATA spd limit for
1623 * Adjust SATA spd limit of @ap downward. Note that this
1624 * function only adjusts the limit. The change must be applied
1625 * using sata_set_spd().
1628 * Inherited from caller.
1631 * 0 on success, negative errno on failure
1633 int sata_down_spd_limit(struct ata_port *ap)
1635 u32 sstatus, spd, mask;
1638 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
1642 mask = ap->sata_spd_limit;
1645 highbit = fls(mask) - 1;
1646 mask &= ~(1 << highbit);
1648 spd = (sstatus >> 4) & 0xf;
1652 mask &= (1 << spd) - 1;
1656 ap->sata_spd_limit = mask;
1658 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
1659 sata_spd_string(fls(mask)));
1664 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
1668 if (ap->sata_spd_limit == UINT_MAX)
1671 limit = fls(ap->sata_spd_limit);
1673 spd = (*scontrol >> 4) & 0xf;
1674 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
1676 return spd != limit;
1680 * sata_set_spd_needed - is SATA spd configuration needed
1681 * @ap: Port in question
1683 * Test whether the spd limit in SControl matches
1684 * @ap->sata_spd_limit. This function is used to determine
1685 * whether hardreset is necessary to apply SATA spd
1689 * Inherited from caller.
1692 * 1 if SATA spd configuration is needed, 0 otherwise.
1694 int sata_set_spd_needed(struct ata_port *ap)
1698 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
1701 return __sata_set_spd_needed(ap, &scontrol);
1705 * sata_set_spd - set SATA spd according to spd limit
1706 * @ap: Port to set SATA spd for
1708 * Set SATA spd of @ap according to sata_spd_limit.
1711 * Inherited from caller.
1714 * 0 if spd doesn't need to be changed, 1 if spd has been
1715 * changed. Negative errno if SCR registers are inaccessible.
1717 int sata_set_spd(struct ata_port *ap)
1722 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
1725 if (!__sata_set_spd_needed(ap, &scontrol))
1728 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
1735 * This mode timing computation functionality is ported over from
1736 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1739 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1740 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1741 * for PIO 5, which is a nonstandard extension and UDMA6, which
1742 * is currently supported only by Maxtor drives.
1745 static const struct ata_timing ata_timing[] = {
1747 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1748 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1749 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1750 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1752 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1753 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1754 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1756 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1758 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1759 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1760 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1762 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1763 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1764 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1766 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1767 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1768 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1770 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1771 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1772 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1774 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1779 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1780 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1782 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1784 q->setup = EZ(t->setup * 1000, T);
1785 q->act8b = EZ(t->act8b * 1000, T);
1786 q->rec8b = EZ(t->rec8b * 1000, T);
1787 q->cyc8b = EZ(t->cyc8b * 1000, T);
1788 q->active = EZ(t->active * 1000, T);
1789 q->recover = EZ(t->recover * 1000, T);
1790 q->cycle = EZ(t->cycle * 1000, T);
1791 q->udma = EZ(t->udma * 1000, UT);
1794 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1795 struct ata_timing *m, unsigned int what)
1797 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1798 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1799 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1800 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1801 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1802 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1803 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1804 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1807 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1809 const struct ata_timing *t;
1811 for (t = ata_timing; t->mode != speed; t++)
1812 if (t->mode == 0xFF)
1817 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1818 struct ata_timing *t, int T, int UT)
1820 const struct ata_timing *s;
1821 struct ata_timing p;
1827 if (!(s = ata_timing_find_mode(speed)))
1830 memcpy(t, s, sizeof(*s));
1833 * If the drive is an EIDE drive, it can tell us it needs extended
1834 * PIO/MW_DMA cycle timing.
1837 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1838 memset(&p, 0, sizeof(p));
1839 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1840 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1841 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1842 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1843 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1845 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1849 * Convert the timing to bus clock counts.
1852 ata_timing_quantize(t, t, T, UT);
1855 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1856 * S.M.A.R.T * and some other commands. We have to ensure that the
1857 * DMA cycle timing is slower/equal than the fastest PIO timing.
1860 if (speed > XFER_PIO_4) {
1861 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1862 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1866 * Lengthen active & recovery time so that cycle time is correct.
1869 if (t->act8b + t->rec8b < t->cyc8b) {
1870 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1871 t->rec8b = t->cyc8b - t->act8b;
1874 if (t->active + t->recover < t->cycle) {
1875 t->active += (t->cycle - (t->active + t->recover)) / 2;
1876 t->recover = t->cycle - t->active;
1883 * ata_down_xfermask_limit - adjust dev xfer masks downward
1884 * @dev: Device to adjust xfer masks
1885 * @force_pio0: Force PIO0
1887 * Adjust xfer masks of @dev downward. Note that this function
1888 * does not apply the change. Invoking ata_set_mode() afterwards
1889 * will apply the limit.
1892 * Inherited from caller.
1895 * 0 on success, negative errno on failure
1897 int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
1899 unsigned long xfer_mask;
1902 xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
1907 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1908 if (xfer_mask & ATA_MASK_UDMA)
1909 xfer_mask &= ~ATA_MASK_MWDMA;
1911 highbit = fls(xfer_mask) - 1;
1912 xfer_mask &= ~(1 << highbit);
1914 xfer_mask &= 1 << ATA_SHIFT_PIO;
1918 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
1921 ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
1922 ata_mode_string(xfer_mask));
1930 static int ata_dev_set_mode(struct ata_device *dev)
1932 unsigned int err_mask;
1935 dev->flags &= ~ATA_DFLAG_PIO;
1936 if (dev->xfer_shift == ATA_SHIFT_PIO)
1937 dev->flags |= ATA_DFLAG_PIO;
1939 err_mask = ata_dev_set_xfermode(dev);
1941 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
1942 "(err_mask=0x%x)\n", err_mask);
1946 rc = ata_dev_revalidate(dev, 0);
1950 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1951 dev->xfer_shift, (int)dev->xfer_mode);
1953 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1954 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
1959 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1960 * @ap: port on which timings will be programmed
1961 * @r_failed_dev: out paramter for failed device
1963 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1964 * ata_set_mode() fails, pointer to the failing device is
1965 * returned in @r_failed_dev.
1968 * PCI/etc. bus probe sem.
1971 * 0 on success, negative errno otherwise
1973 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
1975 struct ata_device *dev;
1976 int i, rc = 0, used_dma = 0, found = 0;
1978 /* has private set_mode? */
1979 if (ap->ops->set_mode) {
1980 /* FIXME: make ->set_mode handle no device case and
1981 * return error code and failing device on failure.
1983 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1984 if (ata_dev_enabled(&ap->device[i])) {
1985 ap->ops->set_mode(ap);
1992 /* step 1: calculate xfer_mask */
1993 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1994 unsigned int pio_mask, dma_mask;
1996 dev = &ap->device[i];
1998 if (!ata_dev_enabled(dev))
2001 ata_dev_xfermask(dev);
2003 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2004 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2005 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2006 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2015 /* step 2: always set host PIO timings */
2016 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2017 dev = &ap->device[i];
2018 if (!ata_dev_enabled(dev))
2021 if (!dev->pio_mode) {
2022 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2027 dev->xfer_mode = dev->pio_mode;
2028 dev->xfer_shift = ATA_SHIFT_PIO;
2029 if (ap->ops->set_piomode)
2030 ap->ops->set_piomode(ap, dev);
2033 /* step 3: set host DMA timings */
2034 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2035 dev = &ap->device[i];
2037 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2040 dev->xfer_mode = dev->dma_mode;
2041 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2042 if (ap->ops->set_dmamode)
2043 ap->ops->set_dmamode(ap, dev);
2046 /* step 4: update devices' xfer mode */
2047 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2048 dev = &ap->device[i];
2050 if (!ata_dev_enabled(dev))
2053 rc = ata_dev_set_mode(dev);
2058 /* Record simplex status. If we selected DMA then the other
2059 * host channels are not permitted to do so.
2061 if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
2062 ap->host_set->simplex_claimed = 1;
2064 /* step5: chip specific finalisation */
2065 if (ap->ops->post_set_mode)
2066 ap->ops->post_set_mode(ap);
2070 *r_failed_dev = dev;
2075 * ata_tf_to_host - issue ATA taskfile to host controller
2076 * @ap: port to which command is being issued
2077 * @tf: ATA taskfile register set
2079 * Issues ATA taskfile register set to ATA host controller,
2080 * with proper synchronization with interrupt handler and
2084 * spin_lock_irqsave(host_set lock)
2087 static inline void ata_tf_to_host(struct ata_port *ap,
2088 const struct ata_taskfile *tf)
2090 ap->ops->tf_load(ap, tf);
2091 ap->ops->exec_command(ap, tf);
2095 * ata_busy_sleep - sleep until BSY clears, or timeout
2096 * @ap: port containing status register to be polled
2097 * @tmout_pat: impatience timeout
2098 * @tmout: overall timeout
2100 * Sleep until ATA Status register bit BSY clears,
2101 * or a timeout occurs.
2106 unsigned int ata_busy_sleep (struct ata_port *ap,
2107 unsigned long tmout_pat, unsigned long tmout)
2109 unsigned long timer_start, timeout;
2112 status = ata_busy_wait(ap, ATA_BUSY, 300);
2113 timer_start = jiffies;
2114 timeout = timer_start + tmout_pat;
2115 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2117 status = ata_busy_wait(ap, ATA_BUSY, 3);
2120 if (status & ATA_BUSY)
2121 ata_port_printk(ap, KERN_WARNING,
2122 "port is slow to respond, please be patient\n");
2124 timeout = timer_start + tmout;
2125 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
2127 status = ata_chk_status(ap);
2130 if (status & ATA_BUSY) {
2131 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2132 "(%lu secs)\n", tmout / HZ);
2139 static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
2141 struct ata_ioports *ioaddr = &ap->ioaddr;
2142 unsigned int dev0 = devmask & (1 << 0);
2143 unsigned int dev1 = devmask & (1 << 1);
2144 unsigned long timeout;
2146 /* if device 0 was found in ata_devchk, wait for its
2150 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2152 /* if device 1 was found in ata_devchk, wait for
2153 * register access, then wait for BSY to clear
2155 timeout = jiffies + ATA_TMOUT_BOOT;
2159 ap->ops->dev_select(ap, 1);
2160 if (ap->flags & ATA_FLAG_MMIO) {
2161 nsect = readb((void __iomem *) ioaddr->nsect_addr);
2162 lbal = readb((void __iomem *) ioaddr->lbal_addr);
2164 nsect = inb(ioaddr->nsect_addr);
2165 lbal = inb(ioaddr->lbal_addr);
2167 if ((nsect == 1) && (lbal == 1))
2169 if (time_after(jiffies, timeout)) {
2173 msleep(50); /* give drive a breather */
2176 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2178 /* is all this really necessary? */
2179 ap->ops->dev_select(ap, 0);
2181 ap->ops->dev_select(ap, 1);
2183 ap->ops->dev_select(ap, 0);
2186 static unsigned int ata_bus_softreset(struct ata_port *ap,
2187 unsigned int devmask)
2189 struct ata_ioports *ioaddr = &ap->ioaddr;
2191 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
2193 /* software reset. causes dev0 to be selected */
2194 if (ap->flags & ATA_FLAG_MMIO) {
2195 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2196 udelay(20); /* FIXME: flush */
2197 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
2198 udelay(20); /* FIXME: flush */
2199 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2201 outb(ap->ctl, ioaddr->ctl_addr);
2203 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
2205 outb(ap->ctl, ioaddr->ctl_addr);
2208 /* spec mandates ">= 2ms" before checking status.
2209 * We wait 150ms, because that was the magic delay used for
2210 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2211 * between when the ATA command register is written, and then
2212 * status is checked. Because waiting for "a while" before
2213 * checking status is fine, post SRST, we perform this magic
2214 * delay here as well.
2216 * Old drivers/ide uses the 2mS rule and then waits for ready
2220 /* Before we perform post reset processing we want to see if
2221 * the bus shows 0xFF because the odd clown forgets the D7
2222 * pulldown resistor.
2224 if (ata_check_status(ap) == 0xFF) {
2225 ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
2226 return AC_ERR_OTHER;
2229 ata_bus_post_reset(ap, devmask);
2235 * ata_bus_reset - reset host port and associated ATA channel
2236 * @ap: port to reset
2238 * This is typically the first time we actually start issuing
2239 * commands to the ATA channel. We wait for BSY to clear, then
2240 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2241 * result. Determine what devices, if any, are on the channel
2242 * by looking at the device 0/1 error register. Look at the signature
2243 * stored in each device's taskfile registers, to determine if
2244 * the device is ATA or ATAPI.
2247 * PCI/etc. bus probe sem.
2248 * Obtains host_set lock.
2251 * Sets ATA_FLAG_DISABLED if bus reset fails.
2254 void ata_bus_reset(struct ata_port *ap)
2256 struct ata_ioports *ioaddr = &ap->ioaddr;
2257 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2259 unsigned int dev0, dev1 = 0, devmask = 0;
2261 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
2263 /* determine if device 0/1 are present */
2264 if (ap->flags & ATA_FLAG_SATA_RESET)
2267 dev0 = ata_devchk(ap, 0);
2269 dev1 = ata_devchk(ap, 1);
2273 devmask |= (1 << 0);
2275 devmask |= (1 << 1);
2277 /* select device 0 again */
2278 ap->ops->dev_select(ap, 0);
2280 /* issue bus reset */
2281 if (ap->flags & ATA_FLAG_SRST)
2282 if (ata_bus_softreset(ap, devmask))
2286 * determine by signature whether we have ATA or ATAPI devices
2288 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
2289 if ((slave_possible) && (err != 0x81))
2290 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
2292 /* re-enable interrupts */
2293 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2296 /* is double-select really necessary? */
2297 if (ap->device[1].class != ATA_DEV_NONE)
2298 ap->ops->dev_select(ap, 1);
2299 if (ap->device[0].class != ATA_DEV_NONE)
2300 ap->ops->dev_select(ap, 0);
2302 /* if no devices were detected, disable this port */
2303 if ((ap->device[0].class == ATA_DEV_NONE) &&
2304 (ap->device[1].class == ATA_DEV_NONE))
2307 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
2308 /* set up device control for ATA_FLAG_SATA_RESET */
2309 if (ap->flags & ATA_FLAG_MMIO)
2310 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
2312 outb(ap->ctl, ioaddr->ctl_addr);
2319 ata_port_printk(ap, KERN_ERR, "disabling port\n");
2320 ap->ops->port_disable(ap);
2325 static int sata_phy_resume(struct ata_port *ap)
2327 unsigned long timeout = jiffies + (HZ * 5);
2328 u32 scontrol, sstatus;
2331 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2334 scontrol = (scontrol & 0x0f0) | 0x300;
2336 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2339 /* Wait for phy to become ready, if necessary. */
2342 if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
2344 if ((sstatus & 0xf) != 1)
2346 } while (time_before(jiffies, timeout));
2352 * ata_std_probeinit - initialize probing
2353 * @ap: port to be probed
2355 * @ap is about to be probed. Initialize it. This function is
2356 * to be used as standard callback for ata_drive_probe_reset().
2358 * NOTE!!! Do not use this function as probeinit if a low level
2359 * driver implements only hardreset. Just pass NULL as probeinit
2360 * in that case. Using this function is probably okay but doing
2361 * so makes reset sequence different from the original
2362 * ->phy_reset implementation and Jeff nervous. :-P
2364 void ata_std_probeinit(struct ata_port *ap)
2369 sata_phy_resume(ap);
2371 /* init sata_spd_limit to the current value */
2372 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
2373 int spd = (scontrol >> 4) & 0xf;
2374 ap->sata_spd_limit &= (1 << spd) - 1;
2377 /* wait for device */
2378 if (ata_port_online(ap))
2379 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
2383 * ata_std_softreset - reset host port via ATA SRST
2384 * @ap: port to reset
2385 * @classes: resulting classes of attached devices
2387 * Reset host port using ATA SRST. This function is to be used
2388 * as standard callback for ata_drive_*_reset() functions.
2391 * Kernel thread context (may sleep)
2394 * 0 on success, -errno otherwise.
2396 int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2398 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
2399 unsigned int devmask = 0, err_mask;
2404 if (ata_port_offline(ap)) {
2405 classes[0] = ATA_DEV_NONE;
2409 /* determine if device 0/1 are present */
2410 if (ata_devchk(ap, 0))
2411 devmask |= (1 << 0);
2412 if (slave_possible && ata_devchk(ap, 1))
2413 devmask |= (1 << 1);
2415 /* select device 0 again */
2416 ap->ops->dev_select(ap, 0);
2418 /* issue bus reset */
2419 DPRINTK("about to softreset, devmask=%x\n", devmask);
2420 err_mask = ata_bus_softreset(ap, devmask);
2422 ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
2427 /* determine by signature whether we have ATA or ATAPI devices */
2428 classes[0] = ata_dev_try_classify(ap, 0, &err);
2429 if (slave_possible && err != 0x81)
2430 classes[1] = ata_dev_try_classify(ap, 1, &err);
2433 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
2438 * sata_std_hardreset - reset host port via SATA phy reset
2439 * @ap: port to reset
2440 * @class: resulting class of attached device
2442 * SATA phy-reset host port using DET bits of SControl register.
2443 * This function is to be used as standard callback for
2444 * ata_drive_*_reset().
2447 * Kernel thread context (may sleep)
2450 * 0 on success, -errno otherwise.
2452 int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
2459 if (sata_set_spd_needed(ap)) {
2460 /* SATA spec says nothing about how to reconfigure
2461 * spd. To be on the safe side, turn off phy during
2462 * reconfiguration. This works for at least ICH7 AHCI
2465 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2468 scontrol = (scontrol & 0x0f0) | 0x302;
2470 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2476 /* issue phy wake/reset */
2477 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2480 scontrol = (scontrol & 0x0f0) | 0x301;
2482 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2485 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2486 * 10.4.2 says at least 1 ms.
2490 /* bring phy back */
2491 sata_phy_resume(ap);
2493 /* TODO: phy layer with polling, timeouts, etc. */
2494 if (ata_port_offline(ap)) {
2495 *class = ATA_DEV_NONE;
2496 DPRINTK("EXIT, link offline\n");
2500 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2501 ata_port_printk(ap, KERN_ERR,
2502 "COMRESET failed (device not ready)\n");
2506 ap->ops->dev_select(ap, 0); /* probably unnecessary */
2508 *class = ata_dev_try_classify(ap, 0, NULL);
2510 DPRINTK("EXIT, class=%u\n", *class);
2515 * ata_std_postreset - standard postreset callback
2516 * @ap: the target ata_port
2517 * @classes: classes of attached devices
2519 * This function is invoked after a successful reset. Note that
2520 * the device might have been reset more than once using
2521 * different reset methods before postreset is invoked.
2523 * This function is to be used as standard callback for
2524 * ata_drive_*_reset().
2527 * Kernel thread context (may sleep)
2529 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2533 /* print link status */
2534 sata_print_link_status(ap);
2536 /* re-enable interrupts */
2537 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2540 /* is double-select really necessary? */
2541 if (classes[0] != ATA_DEV_NONE)
2542 ap->ops->dev_select(ap, 1);
2543 if (classes[1] != ATA_DEV_NONE)
2544 ap->ops->dev_select(ap, 0);
2546 /* bail out if no device is present */
2547 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2548 DPRINTK("EXIT, no device\n");
2552 /* set up device control */
2553 if (ap->ioaddr.ctl_addr) {
2554 if (ap->flags & ATA_FLAG_MMIO)
2555 writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
2557 outb(ap->ctl, ap->ioaddr.ctl_addr);
2564 * ata_std_probe_reset - standard probe reset method
2565 * @ap: prot to perform probe-reset
2566 * @classes: resulting classes of attached devices
2568 * The stock off-the-shelf ->probe_reset method.
2571 * Kernel thread context (may sleep)
2574 * 0 on success, -errno otherwise.
2576 int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2578 ata_reset_fn_t hardreset;
2581 if (sata_scr_valid(ap))
2582 hardreset = sata_std_hardreset;
2584 return ata_drive_probe_reset(ap, ata_std_probeinit,
2585 ata_std_softreset, hardreset,
2586 ata_std_postreset, classes);
2589 int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
2590 unsigned int *classes)
2594 for (i = 0; i < ATA_MAX_DEVICES; i++)
2595 classes[i] = ATA_DEV_UNKNOWN;
2597 rc = reset(ap, classes);
2601 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2602 * is complete and convert all ATA_DEV_UNKNOWN to
2605 for (i = 0; i < ATA_MAX_DEVICES; i++)
2606 if (classes[i] != ATA_DEV_UNKNOWN)
2609 if (i < ATA_MAX_DEVICES)
2610 for (i = 0; i < ATA_MAX_DEVICES; i++)
2611 if (classes[i] == ATA_DEV_UNKNOWN)
2612 classes[i] = ATA_DEV_NONE;
2618 * ata_drive_probe_reset - Perform probe reset with given methods
2619 * @ap: port to reset
2620 * @probeinit: probeinit method (can be NULL)
2621 * @softreset: softreset method (can be NULL)
2622 * @hardreset: hardreset method (can be NULL)
2623 * @postreset: postreset method (can be NULL)
2624 * @classes: resulting classes of attached devices
2626 * Reset the specified port and classify attached devices using
2627 * given methods. This function prefers softreset but tries all
2628 * possible reset sequences to reset and classify devices. This
2629 * function is intended to be used for constructing ->probe_reset
2630 * callback by low level drivers.
2632 * Reset methods should follow the following rules.
2634 * - Return 0 on sucess, -errno on failure.
2635 * - If classification is supported, fill classes[] with
2636 * recognized class codes.
2637 * - If classification is not supported, leave classes[] alone.
2640 * Kernel thread context (may sleep)
2643 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2644 * if classification fails, and any error code from reset
2647 int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2648 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2649 ata_postreset_fn_t postreset, unsigned int *classes)
2656 if (softreset && !sata_set_spd_needed(ap)) {
2657 rc = ata_do_reset(ap, softreset, classes);
2658 if (rc == 0 && classes[0] != ATA_DEV_UNKNOWN)
2660 ata_port_printk(ap, KERN_INFO, "softreset failed, "
2661 "will try hardreset in 5 secs\n");
2669 rc = ata_do_reset(ap, hardreset, classes);
2671 if (classes[0] != ATA_DEV_UNKNOWN)
2676 if (sata_down_spd_limit(ap))
2679 ata_port_printk(ap, KERN_INFO, "hardreset failed, "
2680 "will retry in 5 secs\n");
2685 ata_port_printk(ap, KERN_INFO,
2686 "hardreset succeeded without classification, "
2687 "will retry softreset in 5 secs\n");
2690 rc = ata_do_reset(ap, softreset, classes);
2696 postreset(ap, classes);
2697 if (classes[0] == ATA_DEV_UNKNOWN)
2704 * ata_dev_same_device - Determine whether new ID matches configured device
2705 * @dev: device to compare against
2706 * @new_class: class of the new device
2707 * @new_id: IDENTIFY page of the new device
2709 * Compare @new_class and @new_id against @dev and determine
2710 * whether @dev is the device indicated by @new_class and
2717 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2719 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
2722 const u16 *old_id = dev->id;
2723 unsigned char model[2][41], serial[2][21];
2726 if (dev->class != new_class) {
2727 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
2728 dev->class, new_class);
2732 ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
2733 ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
2734 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
2735 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
2736 new_n_sectors = ata_id_n_sectors(new_id);
2738 if (strcmp(model[0], model[1])) {
2739 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
2740 "'%s' != '%s'\n", model[0], model[1]);
2744 if (strcmp(serial[0], serial[1])) {
2745 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
2746 "'%s' != '%s'\n", serial[0], serial[1]);
2750 if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
2751 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
2753 (unsigned long long)dev->n_sectors,
2754 (unsigned long long)new_n_sectors);
2762 * ata_dev_revalidate - Revalidate ATA device
2763 * @dev: device to revalidate
2764 * @post_reset: is this revalidation after reset?
2766 * Re-read IDENTIFY page and make sure @dev is still attached to
2770 * Kernel thread context (may sleep)
2773 * 0 on success, negative errno otherwise
2775 int ata_dev_revalidate(struct ata_device *dev, int post_reset)
2777 unsigned int class = dev->class;
2778 u16 *id = (void *)dev->ap->sector_buf;
2781 if (!ata_dev_enabled(dev)) {
2787 rc = ata_dev_read_id(dev, &class, post_reset, id);
2791 /* is the device still there? */
2792 if (!ata_dev_same_device(dev, class, id)) {
2797 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
2799 /* configure device according to the new ID */
2800 rc = ata_dev_configure(dev, 0);
2805 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
2809 static const char * const ata_dma_blacklist [] = {
2810 "WDC AC11000H", NULL,
2811 "WDC AC22100H", NULL,
2812 "WDC AC32500H", NULL,
2813 "WDC AC33100H", NULL,
2814 "WDC AC31600H", NULL,
2815 "WDC AC32100H", "24.09P07",
2816 "WDC AC23200L", "21.10N21",
2817 "Compaq CRD-8241B", NULL,
2822 "SanDisk SDP3B", NULL,
2823 "SanDisk SDP3B-64", NULL,
2824 "SANYO CD-ROM CRD", NULL,
2825 "HITACHI CDR-8", NULL,
2826 "HITACHI CDR-8335", NULL,
2827 "HITACHI CDR-8435", NULL,
2828 "Toshiba CD-ROM XM-6202B", NULL,
2829 "TOSHIBA CD-ROM XM-1702BC", NULL,
2831 "E-IDE CD-ROM CR-840", NULL,
2832 "CD-ROM Drive/F5A", NULL,
2833 "WPI CDD-820", NULL,
2834 "SAMSUNG CD-ROM SC-148C", NULL,
2835 "SAMSUNG CD-ROM SC", NULL,
2836 "SanDisk SDP3B-64", NULL,
2837 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
2838 "_NEC DV5800A", NULL,
2839 "SAMSUNG CD-ROM SN-124", "N001"
2842 static int ata_strim(char *s, size_t len)
2844 len = strnlen(s, len);
2846 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2847 while ((len > 0) && (s[len - 1] == ' ')) {
2854 static int ata_dma_blacklisted(const struct ata_device *dev)
2856 unsigned char model_num[40];
2857 unsigned char model_rev[16];
2858 unsigned int nlen, rlen;
2861 ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2863 ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
2865 nlen = ata_strim(model_num, sizeof(model_num));
2866 rlen = ata_strim(model_rev, sizeof(model_rev));
2868 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
2869 if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
2870 if (ata_dma_blacklist[i+1] == NULL)
2872 if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
2880 * ata_dev_xfermask - Compute supported xfermask of the given device
2881 * @dev: Device to compute xfermask for
2883 * Compute supported xfermask of @dev and store it in
2884 * dev->*_mask. This function is responsible for applying all
2885 * known limits including host controller limits, device
2888 * FIXME: The current implementation limits all transfer modes to
2889 * the fastest of the lowested device on the port. This is not
2890 * required on most controllers.
2895 static void ata_dev_xfermask(struct ata_device *dev)
2897 struct ata_port *ap = dev->ap;
2898 struct ata_host_set *hs = ap->host_set;
2899 unsigned long xfer_mask;
2902 xfer_mask = ata_pack_xfermask(ap->pio_mask,
2903 ap->mwdma_mask, ap->udma_mask);
2905 /* Apply cable rule here. Don't apply it early because when
2906 * we handle hot plug the cable type can itself change.
2908 if (ap->cbl == ATA_CBL_PATA40)
2909 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
2911 /* FIXME: Use port-wide xfermask for now */
2912 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2913 struct ata_device *d = &ap->device[i];
2915 if (ata_dev_absent(d))
2918 if (ata_dev_disabled(d)) {
2919 /* to avoid violating device selection timing */
2920 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2921 UINT_MAX, UINT_MAX);
2925 xfer_mask &= ata_pack_xfermask(d->pio_mask,
2926 d->mwdma_mask, d->udma_mask);
2927 xfer_mask &= ata_id_xfermask(d->id);
2928 if (ata_dma_blacklisted(d))
2929 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2932 if (ata_dma_blacklisted(dev))
2933 ata_dev_printk(dev, KERN_WARNING,
2934 "device is on DMA blacklist, disabling DMA\n");
2936 if (hs->flags & ATA_HOST_SIMPLEX) {
2937 if (hs->simplex_claimed)
2938 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
2941 if (ap->ops->mode_filter)
2942 xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
2944 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
2945 &dev->mwdma_mask, &dev->udma_mask);
2949 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2950 * @dev: Device to which command will be sent
2952 * Issue SET FEATURES - XFER MODE command to device @dev
2956 * PCI/etc. bus probe sem.
2959 * 0 on success, AC_ERR_* mask otherwise.
2962 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
2964 struct ata_taskfile tf;
2965 unsigned int err_mask;
2967 /* set up set-features taskfile */
2968 DPRINTK("set features - xfer mode\n");
2970 ata_tf_init(dev, &tf);
2971 tf.command = ATA_CMD_SET_FEATURES;
2972 tf.feature = SETFEATURES_XFER;
2973 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2974 tf.protocol = ATA_PROT_NODATA;
2975 tf.nsect = dev->xfer_mode;
2977 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
2979 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2984 * ata_dev_init_params - Issue INIT DEV PARAMS command
2985 * @dev: Device to which command will be sent
2986 * @heads: Number of heads
2987 * @sectors: Number of sectors
2990 * Kernel thread context (may sleep)
2993 * 0 on success, AC_ERR_* mask otherwise.
2995 static unsigned int ata_dev_init_params(struct ata_device *dev,
2996 u16 heads, u16 sectors)
2998 struct ata_taskfile tf;
2999 unsigned int err_mask;
3001 /* Number of sectors per track 1-255. Number of heads 1-16 */
3002 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3003 return AC_ERR_INVALID;
3005 /* set up init dev params taskfile */
3006 DPRINTK("init dev params \n");
3008 ata_tf_init(dev, &tf);
3009 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3010 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3011 tf.protocol = ATA_PROT_NODATA;
3013 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3015 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3017 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3022 * ata_sg_clean - Unmap DMA memory associated with command
3023 * @qc: Command containing DMA memory to be released
3025 * Unmap all mapped DMA memory associated with this command.
3028 * spin_lock_irqsave(host_set lock)
3031 static void ata_sg_clean(struct ata_queued_cmd *qc)
3033 struct ata_port *ap = qc->ap;
3034 struct scatterlist *sg = qc->__sg;
3035 int dir = qc->dma_dir;
3036 void *pad_buf = NULL;
3038 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3039 WARN_ON(sg == NULL);
3041 if (qc->flags & ATA_QCFLAG_SINGLE)
3042 WARN_ON(qc->n_elem > 1);
3044 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3046 /* if we padded the buffer out to 32-bit bound, and data
3047 * xfer direction is from-device, we must copy from the
3048 * pad buffer back into the supplied buffer
3050 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
3051 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3053 if (qc->flags & ATA_QCFLAG_SG) {
3055 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3056 /* restore last sg */
3057 sg[qc->orig_n_elem - 1].length += qc->pad_len;
3059 struct scatterlist *psg = &qc->pad_sgent;
3060 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3061 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
3062 kunmap_atomic(addr, KM_IRQ0);
3066 dma_unmap_single(ap->dev,
3067 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
3070 sg->length += qc->pad_len;
3072 memcpy(qc->buf_virt + sg->length - qc->pad_len,
3073 pad_buf, qc->pad_len);
3076 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3081 * ata_fill_sg - Fill PCI IDE PRD table
3082 * @qc: Metadata associated with taskfile to be transferred
3084 * Fill PCI IDE PRD (scatter-gather) table with segments
3085 * associated with the current disk command.
3088 * spin_lock_irqsave(host_set lock)
3091 static void ata_fill_sg(struct ata_queued_cmd *qc)
3093 struct ata_port *ap = qc->ap;
3094 struct scatterlist *sg;
3097 WARN_ON(qc->__sg == NULL);
3098 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
3101 ata_for_each_sg(sg, qc) {
3105 /* determine if physical DMA addr spans 64K boundary.
3106 * Note h/w doesn't support 64-bit, so we unconditionally
3107 * truncate dma_addr_t to u32.
3109 addr = (u32) sg_dma_address(sg);
3110 sg_len = sg_dma_len(sg);
3113 offset = addr & 0xffff;
3115 if ((offset + sg_len) > 0x10000)
3116 len = 0x10000 - offset;
3118 ap->prd[idx].addr = cpu_to_le32(addr);
3119 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
3120 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
3129 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
3132 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3133 * @qc: Metadata associated with taskfile to check
3135 * Allow low-level driver to filter ATA PACKET commands, returning
3136 * a status indicating whether or not it is OK to use DMA for the
3137 * supplied PACKET command.
3140 * spin_lock_irqsave(host_set lock)
3142 * RETURNS: 0 when ATAPI DMA can be used
3145 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
3147 struct ata_port *ap = qc->ap;
3148 int rc = 0; /* Assume ATAPI DMA is OK by default */
3150 if (ap->ops->check_atapi_dma)
3151 rc = ap->ops->check_atapi_dma(qc);
3156 * ata_qc_prep - Prepare taskfile for submission
3157 * @qc: Metadata associated with taskfile to be prepared
3159 * Prepare ATA taskfile for submission.
3162 * spin_lock_irqsave(host_set lock)
3164 void ata_qc_prep(struct ata_queued_cmd *qc)
3166 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
3172 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
3175 * ata_sg_init_one - Associate command with memory buffer
3176 * @qc: Command to be associated
3177 * @buf: Memory buffer
3178 * @buflen: Length of memory buffer, in bytes.
3180 * Initialize the data-related elements of queued_cmd @qc
3181 * to point to a single memory buffer, @buf of byte length @buflen.
3184 * spin_lock_irqsave(host_set lock)
3187 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
3189 struct scatterlist *sg;
3191 qc->flags |= ATA_QCFLAG_SINGLE;
3193 memset(&qc->sgent, 0, sizeof(qc->sgent));
3194 qc->__sg = &qc->sgent;
3196 qc->orig_n_elem = 1;
3200 sg_init_one(sg, buf, buflen);
3204 * ata_sg_init - Associate command with scatter-gather table.
3205 * @qc: Command to be associated
3206 * @sg: Scatter-gather table.
3207 * @n_elem: Number of elements in s/g table.
3209 * Initialize the data-related elements of queued_cmd @qc
3210 * to point to a scatter-gather table @sg, containing @n_elem
3214 * spin_lock_irqsave(host_set lock)
3217 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
3218 unsigned int n_elem)
3220 qc->flags |= ATA_QCFLAG_SG;
3222 qc->n_elem = n_elem;
3223 qc->orig_n_elem = n_elem;
3227 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3228 * @qc: Command with memory buffer to be mapped.
3230 * DMA-map the memory buffer associated with queued_cmd @qc.
3233 * spin_lock_irqsave(host_set lock)
3236 * Zero on success, negative on error.
3239 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
3241 struct ata_port *ap = qc->ap;
3242 int dir = qc->dma_dir;
3243 struct scatterlist *sg = qc->__sg;
3244 dma_addr_t dma_address;
3247 /* we must lengthen transfers to end on a 32-bit boundary */
3248 qc->pad_len = sg->length & 3;
3250 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3251 struct scatterlist *psg = &qc->pad_sgent;
3253 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3255 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3257 if (qc->tf.flags & ATA_TFLAG_WRITE)
3258 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
3261 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3262 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3264 sg->length -= qc->pad_len;
3265 if (sg->length == 0)
3268 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3269 sg->length, qc->pad_len);
3277 dma_address = dma_map_single(ap->dev, qc->buf_virt,
3279 if (dma_mapping_error(dma_address)) {
3281 sg->length += qc->pad_len;
3285 sg_dma_address(sg) = dma_address;
3286 sg_dma_len(sg) = sg->length;
3289 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
3290 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3296 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3297 * @qc: Command with scatter-gather table to be mapped.
3299 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3302 * spin_lock_irqsave(host_set lock)
3305 * Zero on success, negative on error.
3309 static int ata_sg_setup(struct ata_queued_cmd *qc)
3311 struct ata_port *ap = qc->ap;
3312 struct scatterlist *sg = qc->__sg;
3313 struct scatterlist *lsg = &sg[qc->n_elem - 1];
3314 int n_elem, pre_n_elem, dir, trim_sg = 0;
3316 VPRINTK("ENTER, ata%u\n", ap->id);
3317 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
3319 /* we must lengthen transfers to end on a 32-bit boundary */
3320 qc->pad_len = lsg->length & 3;
3322 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
3323 struct scatterlist *psg = &qc->pad_sgent;
3324 unsigned int offset;
3326 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3328 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
3331 * psg->page/offset are used to copy to-be-written
3332 * data in this function or read data in ata_sg_clean.
3334 offset = lsg->offset + lsg->length - qc->pad_len;
3335 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
3336 psg->offset = offset_in_page(offset);
3338 if (qc->tf.flags & ATA_TFLAG_WRITE) {
3339 void *addr = kmap_atomic(psg->page, KM_IRQ0);
3340 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3341 kunmap_atomic(addr, KM_IRQ0);
3344 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
3345 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
3347 lsg->length -= qc->pad_len;
3348 if (lsg->length == 0)
3351 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3352 qc->n_elem - 1, lsg->length, qc->pad_len);
3355 pre_n_elem = qc->n_elem;
3356 if (trim_sg && pre_n_elem)
3365 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3367 /* restore last sg */
3368 lsg->length += qc->pad_len;
3372 DPRINTK("%d sg elements mapped\n", n_elem);
3375 qc->n_elem = n_elem;
3381 * ata_poll_qc_complete - turn irq back on and finish qc
3382 * @qc: Command to complete
3383 * @err_mask: ATA status register content
3386 * None. (grabs host lock)
3389 void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3391 struct ata_port *ap = qc->ap;
3392 unsigned long flags;
3394 spin_lock_irqsave(&ap->host_set->lock, flags);
3395 ap->flags &= ~ATA_FLAG_NOINTR;
3397 ata_qc_complete(qc);
3398 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3402 * ata_pio_poll - poll using PIO, depending on current state
3403 * @qc: qc in progress
3406 * None. (executing in kernel thread context)
3409 * timeout value to use
3411 static unsigned long ata_pio_poll(struct ata_queued_cmd *qc)
3413 struct ata_port *ap = qc->ap;
3415 unsigned int poll_state = HSM_ST_UNKNOWN;
3416 unsigned int reg_state = HSM_ST_UNKNOWN;
3418 switch (ap->hsm_task_state) {
3421 poll_state = HSM_ST_POLL;
3425 case HSM_ST_LAST_POLL:
3426 poll_state = HSM_ST_LAST_POLL;
3427 reg_state = HSM_ST_LAST;
3434 status = ata_chk_status(ap);
3435 if (status & ATA_BUSY) {
3436 if (time_after(jiffies, ap->pio_task_timeout)) {
3437 qc->err_mask |= AC_ERR_TIMEOUT;
3438 ap->hsm_task_state = HSM_ST_TMOUT;
3441 ap->hsm_task_state = poll_state;
3442 return ATA_SHORT_PAUSE;
3445 ap->hsm_task_state = reg_state;
3450 * ata_pio_complete - check if drive is busy or idle
3451 * @qc: qc to complete
3454 * None. (executing in kernel thread context)
3457 * Non-zero if qc completed, zero otherwise.
3459 static int ata_pio_complete(struct ata_queued_cmd *qc)
3461 struct ata_port *ap = qc->ap;
3465 * This is purely heuristic. This is a fast path. Sometimes when
3466 * we enter, BSY will be cleared in a chk-status or two. If not,
3467 * the drive is probably seeking or something. Snooze for a couple
3468 * msecs, then chk-status again. If still busy, fall back to
3469 * HSM_ST_POLL state.
3471 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3472 if (drv_stat & ATA_BUSY) {
3474 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
3475 if (drv_stat & ATA_BUSY) {
3476 ap->hsm_task_state = HSM_ST_LAST_POLL;
3477 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3482 drv_stat = ata_wait_idle(ap);
3483 if (!ata_ok(drv_stat)) {
3484 qc->err_mask |= __ac_err_mask(drv_stat);
3485 ap->hsm_task_state = HSM_ST_ERR;
3489 ap->hsm_task_state = HSM_ST_IDLE;
3491 WARN_ON(qc->err_mask);
3492 ata_poll_qc_complete(qc);
3494 /* another command may start at this point */
3501 * swap_buf_le16 - swap halves of 16-bit words in place
3502 * @buf: Buffer to swap
3503 * @buf_words: Number of 16-bit words in buffer.
3505 * Swap halves of 16-bit words if needed to convert from
3506 * little-endian byte order to native cpu byte order, or
3510 * Inherited from caller.
3512 void swap_buf_le16(u16 *buf, unsigned int buf_words)
3517 for (i = 0; i < buf_words; i++)
3518 buf[i] = le16_to_cpu(buf[i]);
3519 #endif /* __BIG_ENDIAN */
3523 * ata_mmio_data_xfer - Transfer data by MMIO
3524 * @ap: port to read/write
3526 * @buflen: buffer length
3527 * @write_data: read/write
3529 * Transfer data from/to the device data register by MMIO.
3532 * Inherited from caller.
3535 static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3536 unsigned int buflen, int write_data)
3539 unsigned int words = buflen >> 1;
3540 u16 *buf16 = (u16 *) buf;
3541 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3543 /* Transfer multiple of 2 bytes */
3545 for (i = 0; i < words; i++)
3546 writew(le16_to_cpu(buf16[i]), mmio);
3548 for (i = 0; i < words; i++)
3549 buf16[i] = cpu_to_le16(readw(mmio));
3552 /* Transfer trailing 1 byte, if any. */
3553 if (unlikely(buflen & 0x01)) {
3554 u16 align_buf[1] = { 0 };
3555 unsigned char *trailing_buf = buf + buflen - 1;
3558 memcpy(align_buf, trailing_buf, 1);
3559 writew(le16_to_cpu(align_buf[0]), mmio);
3561 align_buf[0] = cpu_to_le16(readw(mmio));
3562 memcpy(trailing_buf, align_buf, 1);
3568 * ata_pio_data_xfer - Transfer data by PIO
3569 * @ap: port to read/write
3571 * @buflen: buffer length
3572 * @write_data: read/write
3574 * Transfer data from/to the device data register by PIO.
3577 * Inherited from caller.
3580 static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3581 unsigned int buflen, int write_data)
3583 unsigned int words = buflen >> 1;
3585 /* Transfer multiple of 2 bytes */
3587 outsw(ap->ioaddr.data_addr, buf, words);
3589 insw(ap->ioaddr.data_addr, buf, words);
3591 /* Transfer trailing 1 byte, if any. */
3592 if (unlikely(buflen & 0x01)) {
3593 u16 align_buf[1] = { 0 };
3594 unsigned char *trailing_buf = buf + buflen - 1;
3597 memcpy(align_buf, trailing_buf, 1);
3598 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3600 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3601 memcpy(trailing_buf, align_buf, 1);
3607 * ata_data_xfer - Transfer data from/to the data register.
3608 * @ap: port to read/write
3610 * @buflen: buffer length
3611 * @do_write: read/write
3613 * Transfer data from/to the device data register.
3616 * Inherited from caller.
3619 static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3620 unsigned int buflen, int do_write)
3622 /* Make the crap hardware pay the costs not the good stuff */
3623 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3624 unsigned long flags;
3625 local_irq_save(flags);
3626 if (ap->flags & ATA_FLAG_MMIO)
3627 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3629 ata_pio_data_xfer(ap, buf, buflen, do_write);
3630 local_irq_restore(flags);
3632 if (ap->flags & ATA_FLAG_MMIO)
3633 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3635 ata_pio_data_xfer(ap, buf, buflen, do_write);
3640 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3641 * @qc: Command on going
3643 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3646 * Inherited from caller.
3649 static void ata_pio_sector(struct ata_queued_cmd *qc)
3651 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3652 struct scatterlist *sg = qc->__sg;
3653 struct ata_port *ap = qc->ap;
3655 unsigned int offset;
3658 if (qc->cursect == (qc->nsect - 1))
3659 ap->hsm_task_state = HSM_ST_LAST;
3661 page = sg[qc->cursg].page;
3662 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3664 /* get the current page and offset */
3665 page = nth_page(page, (offset >> PAGE_SHIFT));
3666 offset %= PAGE_SIZE;
3668 buf = kmap(page) + offset;
3673 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
3678 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3680 /* do the actual data transfer */
3681 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3682 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3688 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3689 * @qc: Command on going
3690 * @bytes: number of bytes
3692 * Transfer Transfer data from/to the ATAPI device.
3695 * Inherited from caller.
3699 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3701 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3702 struct scatterlist *sg = qc->__sg;
3703 struct ata_port *ap = qc->ap;
3706 unsigned int offset, count;
3708 if (qc->curbytes + bytes >= qc->nbytes)
3709 ap->hsm_task_state = HSM_ST_LAST;
3712 if (unlikely(qc->cursg >= qc->n_elem)) {
3714 * The end of qc->sg is reached and the device expects
3715 * more data to transfer. In order not to overrun qc->sg
3716 * and fulfill length specified in the byte count register,
3717 * - for read case, discard trailing data from the device
3718 * - for write case, padding zero data to the device
3720 u16 pad_buf[1] = { 0 };
3721 unsigned int words = bytes >> 1;
3724 if (words) /* warning if bytes > 1 */
3725 ata_dev_printk(qc->dev, KERN_WARNING,
3726 "%u bytes trailing data\n", bytes);
3728 for (i = 0; i < words; i++)
3729 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3731 ap->hsm_task_state = HSM_ST_LAST;
3735 sg = &qc->__sg[qc->cursg];
3738 offset = sg->offset + qc->cursg_ofs;
3740 /* get the current page and offset */
3741 page = nth_page(page, (offset >> PAGE_SHIFT));
3742 offset %= PAGE_SIZE;
3744 /* don't overrun current sg */
3745 count = min(sg->length - qc->cursg_ofs, bytes);
3747 /* don't cross page boundaries */
3748 count = min(count, (unsigned int)PAGE_SIZE - offset);
3750 buf = kmap(page) + offset;
3753 qc->curbytes += count;
3754 qc->cursg_ofs += count;
3756 if (qc->cursg_ofs == sg->length) {
3761 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3763 /* do the actual data transfer */
3764 ata_data_xfer(ap, buf, count, do_write);
3773 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3774 * @qc: Command on going
3776 * Transfer Transfer data from/to the ATAPI device.
3779 * Inherited from caller.
3782 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3784 struct ata_port *ap = qc->ap;
3785 struct ata_device *dev = qc->dev;
3786 unsigned int ireason, bc_lo, bc_hi, bytes;
3787 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3789 ap->ops->tf_read(ap, &qc->tf);
3790 ireason = qc->tf.nsect;
3791 bc_lo = qc->tf.lbam;
3792 bc_hi = qc->tf.lbah;
3793 bytes = (bc_hi << 8) | bc_lo;
3795 /* shall be cleared to zero, indicating xfer of data */
3796 if (ireason & (1 << 0))
3799 /* make sure transfer direction matches expected */
3800 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3801 if (do_write != i_write)
3804 __atapi_pio_bytes(qc, bytes);
3809 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
3810 qc->err_mask |= AC_ERR_HSM;
3811 ap->hsm_task_state = HSM_ST_ERR;
3815 * ata_pio_block - start PIO on a block
3816 * @qc: qc to transfer block for
3819 * None. (executing in kernel thread context)
3821 static void ata_pio_block(struct ata_queued_cmd *qc)
3823 struct ata_port *ap = qc->ap;
3827 * This is purely heuristic. This is a fast path.
3828 * Sometimes when we enter, BSY will be cleared in
3829 * a chk-status or two. If not, the drive is probably seeking
3830 * or something. Snooze for a couple msecs, then
3831 * chk-status again. If still busy, fall back to
3832 * HSM_ST_POLL state.
3834 status = ata_busy_wait(ap, ATA_BUSY, 5);
3835 if (status & ATA_BUSY) {
3837 status = ata_busy_wait(ap, ATA_BUSY, 10);
3838 if (status & ATA_BUSY) {
3839 ap->hsm_task_state = HSM_ST_POLL;
3840 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3846 if (status & (ATA_ERR | ATA_DF)) {
3847 qc->err_mask |= AC_ERR_DEV;
3848 ap->hsm_task_state = HSM_ST_ERR;
3852 /* transfer data if any */
3853 if (is_atapi_taskfile(&qc->tf)) {
3854 /* DRQ=0 means no more data to transfer */
3855 if ((status & ATA_DRQ) == 0) {
3856 ap->hsm_task_state = HSM_ST_LAST;
3860 atapi_pio_bytes(qc);
3862 /* handle BSY=0, DRQ=0 as error */
3863 if ((status & ATA_DRQ) == 0) {
3864 qc->err_mask |= AC_ERR_HSM;
3865 ap->hsm_task_state = HSM_ST_ERR;
3873 static void ata_pio_error(struct ata_queued_cmd *qc)
3875 struct ata_port *ap = qc->ap;
3877 if (qc->tf.command != ATA_CMD_PACKET)
3878 ata_dev_printk(qc->dev, KERN_WARNING, "PIO error\n");
3880 /* make sure qc->err_mask is available to
3881 * know what's wrong and recover
3883 WARN_ON(qc->err_mask == 0);
3885 ap->hsm_task_state = HSM_ST_IDLE;
3887 ata_poll_qc_complete(qc);
3890 static void ata_pio_task(void *_data)
3892 struct ata_queued_cmd *qc = _data;
3893 struct ata_port *ap = qc->ap;
3894 unsigned long timeout;
3901 switch (ap->hsm_task_state) {
3910 qc_completed = ata_pio_complete(qc);
3914 case HSM_ST_LAST_POLL:
3915 timeout = ata_pio_poll(qc);
3925 ata_port_queue_task(ap, ata_pio_task, qc, timeout);
3926 else if (!qc_completed)
3931 * atapi_packet_task - Write CDB bytes to hardware
3932 * @_data: qc in progress
3934 * When device has indicated its readiness to accept
3935 * a CDB, this function is called. Send the CDB.
3936 * If DMA is to be performed, exit immediately.
3937 * Otherwise, we are in polling mode, so poll
3938 * status under operation succeeds or fails.
3941 * Kernel thread context (may sleep)
3943 static void atapi_packet_task(void *_data)
3945 struct ata_queued_cmd *qc = _data;
3946 struct ata_port *ap = qc->ap;
3949 /* sleep-wait for BSY to clear */
3950 DPRINTK("busy wait\n");
3951 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
3952 qc->err_mask |= AC_ERR_TIMEOUT;
3956 /* make sure DRQ is set */
3957 status = ata_chk_status(ap);
3958 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
3959 qc->err_mask |= AC_ERR_HSM;
3964 DPRINTK("send cdb\n");
3965 WARN_ON(qc->dev->cdb_len < 12);
3967 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
3968 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
3969 unsigned long flags;
3971 /* Once we're done issuing command and kicking bmdma,
3972 * irq handler takes over. To not lose irq, we need
3973 * to clear NOINTR flag before sending cdb, but
3974 * interrupt handler shouldn't be invoked before we're
3975 * finished. Hence, the following locking.
3977 spin_lock_irqsave(&ap->host_set->lock, flags);
3978 ap->flags &= ~ATA_FLAG_NOINTR;
3979 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3980 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
3981 ap->ops->bmdma_start(qc); /* initiate bmdma */
3982 spin_unlock_irqrestore(&ap->host_set->lock, flags);
3984 ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
3986 /* PIO commands are handled by polling */
3987 ap->hsm_task_state = HSM_ST;
3988 ata_port_queue_task(ap, ata_pio_task, qc, 0);
3994 ata_poll_qc_complete(qc);
3998 * ata_qc_new - Request an available ATA command, for queueing
3999 * @ap: Port associated with device @dev
4000 * @dev: Device from whom we request an available command structure
4006 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4008 struct ata_queued_cmd *qc = NULL;
4011 for (i = 0; i < ATA_MAX_QUEUE; i++)
4012 if (!test_and_set_bit(i, &ap->qactive)) {
4013 qc = ata_qc_from_tag(ap, i);
4024 * ata_qc_new_init - Request an available ATA command, and initialize it
4025 * @dev: Device from whom we request an available command structure
4031 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4033 struct ata_port *ap = dev->ap;
4034 struct ata_queued_cmd *qc;
4036 qc = ata_qc_new(ap);
4049 * ata_qc_free - free unused ata_queued_cmd
4050 * @qc: Command to complete
4052 * Designed to free unused ata_queued_cmd object
4053 * in case something prevents using it.
4056 * spin_lock_irqsave(host_set lock)
4058 void ata_qc_free(struct ata_queued_cmd *qc)
4060 struct ata_port *ap = qc->ap;
4063 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4067 if (likely(ata_tag_valid(tag))) {
4068 qc->tag = ATA_TAG_POISON;
4069 clear_bit(tag, &ap->qactive);
4073 void __ata_qc_complete(struct ata_queued_cmd *qc)
4075 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4076 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4078 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4081 /* command should be marked inactive atomically with qc completion */
4082 qc->ap->active_tag = ATA_TAG_POISON;
4084 /* atapi: mark qc as inactive to prevent the interrupt handler
4085 * from completing the command twice later, before the error handler
4086 * is called. (when rc != 0 and atapi request sense is needed)
4088 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4090 /* call completion callback */
4091 qc->complete_fn(qc);
4094 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
4096 struct ata_port *ap = qc->ap;
4098 switch (qc->tf.protocol) {
4100 case ATA_PROT_ATAPI_DMA:
4103 case ATA_PROT_ATAPI:
4105 if (ap->flags & ATA_FLAG_PIO_DMA)
4118 * ata_qc_issue - issue taskfile to device
4119 * @qc: command to issue to device
4121 * Prepare an ATA command to submission to device.
4122 * This includes mapping the data into a DMA-able
4123 * area, filling in the S/G table, and finally
4124 * writing the taskfile to hardware, starting the command.
4127 * spin_lock_irqsave(host_set lock)
4129 void ata_qc_issue(struct ata_queued_cmd *qc)
4131 struct ata_port *ap = qc->ap;
4133 qc->ap->active_tag = qc->tag;
4134 qc->flags |= ATA_QCFLAG_ACTIVE;
4136 if (ata_should_dma_map(qc)) {
4137 if (qc->flags & ATA_QCFLAG_SG) {
4138 if (ata_sg_setup(qc))
4140 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
4141 if (ata_sg_setup_one(qc))
4145 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4148 ap->ops->qc_prep(qc);
4150 qc->err_mask |= ap->ops->qc_issue(qc);
4151 if (unlikely(qc->err_mask))
4156 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4157 qc->err_mask |= AC_ERR_SYSTEM;
4159 ata_qc_complete(qc);
4163 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4164 * @qc: command to issue to device
4166 * Using various libata functions and hooks, this function
4167 * starts an ATA command. ATA commands are grouped into
4168 * classes called "protocols", and issuing each type of protocol
4169 * is slightly different.
4171 * May be used as the qc_issue() entry in ata_port_operations.
4174 * spin_lock_irqsave(host_set lock)
4177 * Zero on success, AC_ERR_* mask on failure
4180 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
4182 struct ata_port *ap = qc->ap;
4184 ata_dev_select(ap, qc->dev->devno, 1, 0);
4186 switch (qc->tf.protocol) {
4187 case ATA_PROT_NODATA:
4188 ata_tf_to_host(ap, &qc->tf);
4192 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4193 ap->ops->bmdma_setup(qc); /* set up bmdma */
4194 ap->ops->bmdma_start(qc); /* initiate bmdma */
4197 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
4198 ata_qc_set_polling(qc);
4199 ata_tf_to_host(ap, &qc->tf);
4200 ap->hsm_task_state = HSM_ST;
4201 ata_port_queue_task(ap, ata_pio_task, qc, 0);
4204 case ATA_PROT_ATAPI:
4205 ata_qc_set_polling(qc);
4206 ata_tf_to_host(ap, &qc->tf);
4207 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4210 case ATA_PROT_ATAPI_NODATA:
4211 ap->flags |= ATA_FLAG_NOINTR;
4212 ata_tf_to_host(ap, &qc->tf);
4213 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4216 case ATA_PROT_ATAPI_DMA:
4217 ap->flags |= ATA_FLAG_NOINTR;
4218 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
4219 ap->ops->bmdma_setup(qc); /* set up bmdma */
4220 ata_port_queue_task(ap, atapi_packet_task, qc, 0);
4225 return AC_ERR_SYSTEM;
4232 * ata_host_intr - Handle host interrupt for given (port, task)
4233 * @ap: Port on which interrupt arrived (possibly...)
4234 * @qc: Taskfile currently active in engine
4236 * Handle host interrupt for given queued command. Currently,
4237 * only DMA interrupts are handled. All other commands are
4238 * handled via polling with interrupts disabled (nIEN bit).
4241 * spin_lock_irqsave(host_set lock)
4244 * One if interrupt was handled, zero if not (shared irq).
4247 inline unsigned int ata_host_intr (struct ata_port *ap,
4248 struct ata_queued_cmd *qc)
4250 u8 status, host_stat;
4252 switch (qc->tf.protocol) {
4255 case ATA_PROT_ATAPI_DMA:
4256 case ATA_PROT_ATAPI:
4257 /* check status of DMA engine */
4258 host_stat = ap->ops->bmdma_status(ap);
4259 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4261 /* if it's not our irq... */
4262 if (!(host_stat & ATA_DMA_INTR))
4265 /* before we do anything else, clear DMA-Start bit */
4266 ap->ops->bmdma_stop(qc);
4270 case ATA_PROT_ATAPI_NODATA:
4271 case ATA_PROT_NODATA:
4272 /* check altstatus */
4273 status = ata_altstatus(ap);
4274 if (status & ATA_BUSY)
4277 /* check main status, clearing INTRQ */
4278 status = ata_chk_status(ap);
4279 if (unlikely(status & ATA_BUSY))
4281 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4282 ap->id, qc->tf.protocol, status);
4284 /* ack bmdma irq events */
4285 ap->ops->irq_clear(ap);
4287 /* complete taskfile transaction */
4288 qc->err_mask |= ac_err_mask(status);
4289 ata_qc_complete(qc);
4296 return 1; /* irq handled */
4299 ap->stats.idle_irq++;
4302 if ((ap->stats.idle_irq % 1000) == 0) {
4303 ata_irq_ack(ap, 0); /* debug trap */
4304 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
4308 return 0; /* irq not handled */
4312 * ata_interrupt - Default ATA host interrupt handler
4313 * @irq: irq line (unused)
4314 * @dev_instance: pointer to our ata_host_set information structure
4317 * Default interrupt handler for PCI IDE devices. Calls
4318 * ata_host_intr() for each port that is not disabled.
4321 * Obtains host_set lock during operation.
4324 * IRQ_NONE or IRQ_HANDLED.
4327 irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4329 struct ata_host_set *host_set = dev_instance;
4331 unsigned int handled = 0;
4332 unsigned long flags;
4334 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4335 spin_lock_irqsave(&host_set->lock, flags);
4337 for (i = 0; i < host_set->n_ports; i++) {
4338 struct ata_port *ap;
4340 ap = host_set->ports[i];
4342 !(ap->flags & (ATA_FLAG_DISABLED | ATA_FLAG_NOINTR))) {
4343 struct ata_queued_cmd *qc;
4345 qc = ata_qc_from_tag(ap, ap->active_tag);
4346 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4347 (qc->flags & ATA_QCFLAG_ACTIVE))
4348 handled |= ata_host_intr(ap, qc);
4352 spin_unlock_irqrestore(&host_set->lock, flags);
4354 return IRQ_RETVAL(handled);
4358 * sata_scr_valid - test whether SCRs are accessible
4359 * @ap: ATA port to test SCR accessibility for
4361 * Test whether SCRs are accessible for @ap.
4367 * 1 if SCRs are accessible, 0 otherwise.
4369 int sata_scr_valid(struct ata_port *ap)
4371 return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
4375 * sata_scr_read - read SCR register of the specified port
4376 * @ap: ATA port to read SCR for
4378 * @val: Place to store read value
4380 * Read SCR register @reg of @ap into *@val. This function is
4381 * guaranteed to succeed if the cable type of the port is SATA
4382 * and the port implements ->scr_read.
4388 * 0 on success, negative errno on failure.
4390 int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
4392 if (sata_scr_valid(ap)) {
4393 *val = ap->ops->scr_read(ap, reg);
4400 * sata_scr_write - write SCR register of the specified port
4401 * @ap: ATA port to write SCR for
4402 * @reg: SCR to write
4403 * @val: value to write
4405 * Write @val to SCR register @reg of @ap. This function is
4406 * guaranteed to succeed if the cable type of the port is SATA
4407 * and the port implements ->scr_read.
4413 * 0 on success, negative errno on failure.
4415 int sata_scr_write(struct ata_port *ap, int reg, u32 val)
4417 if (sata_scr_valid(ap)) {
4418 ap->ops->scr_write(ap, reg, val);
4425 * sata_scr_write_flush - write SCR register of the specified port and flush
4426 * @ap: ATA port to write SCR for
4427 * @reg: SCR to write
4428 * @val: value to write
4430 * This function is identical to sata_scr_write() except that this
4431 * function performs flush after writing to the register.
4437 * 0 on success, negative errno on failure.
4439 int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
4441 if (sata_scr_valid(ap)) {
4442 ap->ops->scr_write(ap, reg, val);
4443 ap->ops->scr_read(ap, reg);
4450 * ata_port_online - test whether the given port is online
4451 * @ap: ATA port to test
4453 * Test whether @ap is online. Note that this function returns 0
4454 * if online status of @ap cannot be obtained, so
4455 * ata_port_online(ap) != !ata_port_offline(ap).
4461 * 1 if the port online status is available and online.
4463 int ata_port_online(struct ata_port *ap)
4467 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
4473 * ata_port_offline - test whether the given port is offline
4474 * @ap: ATA port to test
4476 * Test whether @ap is offline. Note that this function returns
4477 * 0 if offline status of @ap cannot be obtained, so
4478 * ata_port_online(ap) != !ata_port_offline(ap).
4484 * 1 if the port offline status is available and offline.
4486 int ata_port_offline(struct ata_port *ap)
4490 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
4496 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4497 * without filling any other registers
4499 static int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
4501 struct ata_taskfile tf;
4504 ata_tf_init(dev, &tf);
4507 tf.flags |= ATA_TFLAG_DEVICE;
4508 tf.protocol = ATA_PROT_NODATA;
4510 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4512 ata_dev_printk(dev, KERN_ERR, "%s: ata command failed: %d\n",
4518 static int ata_flush_cache(struct ata_device *dev)
4522 if (!ata_try_flush_cache(dev))
4525 if (ata_id_has_flush_ext(dev->id))
4526 cmd = ATA_CMD_FLUSH_EXT;
4528 cmd = ATA_CMD_FLUSH;
4530 return ata_do_simple_cmd(dev, cmd);
4533 static int ata_standby_drive(struct ata_device *dev)
4535 return ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
4538 static int ata_start_drive(struct ata_device *dev)
4540 return ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
4544 * ata_device_resume - wakeup a previously suspended devices
4545 * @dev: the device to resume
4547 * Kick the drive back into action, by sending it an idle immediate
4548 * command and making sure its transfer mode matches between drive
4552 int ata_device_resume(struct ata_device *dev)
4554 struct ata_port *ap = dev->ap;
4556 if (ap->flags & ATA_FLAG_SUSPENDED) {
4557 struct ata_device *failed_dev;
4558 ap->flags &= ~ATA_FLAG_SUSPENDED;
4559 while (ata_set_mode(ap, &failed_dev))
4560 ata_dev_disable(failed_dev);
4562 if (!ata_dev_enabled(dev))
4564 if (dev->class == ATA_DEV_ATA)
4565 ata_start_drive(dev);
4571 * ata_device_suspend - prepare a device for suspend
4572 * @dev: the device to suspend
4574 * Flush the cache on the drive, if appropriate, then issue a
4575 * standbynow command.
4577 int ata_device_suspend(struct ata_device *dev, pm_message_t state)
4579 struct ata_port *ap = dev->ap;
4581 if (!ata_dev_enabled(dev))
4583 if (dev->class == ATA_DEV_ATA)
4584 ata_flush_cache(dev);
4586 if (state.event != PM_EVENT_FREEZE)
4587 ata_standby_drive(dev);
4588 ap->flags |= ATA_FLAG_SUSPENDED;
4593 * ata_port_start - Set port up for dma.
4594 * @ap: Port to initialize
4596 * Called just after data structures for each port are
4597 * initialized. Allocates space for PRD table.
4599 * May be used as the port_start() entry in ata_port_operations.
4602 * Inherited from caller.
4605 int ata_port_start (struct ata_port *ap)
4607 struct device *dev = ap->dev;
4610 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4614 rc = ata_pad_alloc(ap, dev);
4616 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4620 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4627 * ata_port_stop - Undo ata_port_start()
4628 * @ap: Port to shut down
4630 * Frees the PRD table.
4632 * May be used as the port_stop() entry in ata_port_operations.
4635 * Inherited from caller.
4638 void ata_port_stop (struct ata_port *ap)
4640 struct device *dev = ap->dev;
4642 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4643 ata_pad_free(ap, dev);
4646 void ata_host_stop (struct ata_host_set *host_set)
4648 if (host_set->mmio_base)
4649 iounmap(host_set->mmio_base);
4654 * ata_host_remove - Unregister SCSI host structure with upper layers
4655 * @ap: Port to unregister
4656 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4659 * Inherited from caller.
4662 static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4664 struct Scsi_Host *sh = ap->host;
4669 scsi_remove_host(sh);
4671 ap->ops->port_stop(ap);
4675 * ata_host_init - Initialize an ata_port structure
4676 * @ap: Structure to initialize
4677 * @host: associated SCSI mid-layer structure
4678 * @host_set: Collection of hosts to which @ap belongs
4679 * @ent: Probe information provided by low-level driver
4680 * @port_no: Port number associated with this ata_port
4682 * Initialize a new ata_port structure, and its associated
4686 * Inherited from caller.
4689 static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4690 struct ata_host_set *host_set,
4691 const struct ata_probe_ent *ent, unsigned int port_no)
4697 host->max_channel = 1;
4698 host->unique_id = ata_unique_id++;
4699 host->max_cmd_len = 12;
4701 ap->flags = ATA_FLAG_DISABLED;
4702 ap->id = host->unique_id;
4704 ap->ctl = ATA_DEVCTL_OBS;
4705 ap->host_set = host_set;
4707 ap->port_no = port_no;
4709 ent->legacy_mode ? ent->hard_port_no : port_no;
4710 ap->pio_mask = ent->pio_mask;
4711 ap->mwdma_mask = ent->mwdma_mask;
4712 ap->udma_mask = ent->udma_mask;
4713 ap->flags |= ent->host_flags;
4714 ap->ops = ent->port_ops;
4715 ap->sata_spd_limit = UINT_MAX;
4716 ap->active_tag = ATA_TAG_POISON;
4717 ap->last_ctl = 0xFF;
4719 INIT_WORK(&ap->port_task, NULL, NULL);
4720 INIT_LIST_HEAD(&ap->eh_done_q);
4722 /* set cable type */
4723 ap->cbl = ATA_CBL_NONE;
4724 if (ap->flags & ATA_FLAG_SATA)
4725 ap->cbl = ATA_CBL_SATA;
4727 for (i = 0; i < ATA_MAX_DEVICES; i++) {
4728 struct ata_device *dev = &ap->device[i];
4731 dev->pio_mask = UINT_MAX;
4732 dev->mwdma_mask = UINT_MAX;
4733 dev->udma_mask = UINT_MAX;
4737 ap->stats.unhandled_irq = 1;
4738 ap->stats.idle_irq = 1;
4741 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4745 * ata_host_add - Attach low-level ATA driver to system
4746 * @ent: Information provided by low-level driver
4747 * @host_set: Collections of ports to which we add
4748 * @port_no: Port number associated with this host
4750 * Attach low-level ATA driver to system.
4753 * PCI/etc. bus probe sem.
4756 * New ata_port on success, for NULL on error.
4759 static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
4760 struct ata_host_set *host_set,
4761 unsigned int port_no)
4763 struct Scsi_Host *host;
4764 struct ata_port *ap;
4769 if (!ent->port_ops->probe_reset &&
4770 !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
4771 printk(KERN_ERR "ata%u: no reset mechanism available\n",
4776 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4780 host->transportt = &ata_scsi_transport_template;
4782 ap = ata_shost_to_port(host);
4784 ata_host_init(ap, host, host_set, ent, port_no);
4786 rc = ap->ops->port_start(ap);
4793 scsi_host_put(host);
4798 * ata_device_add - Register hardware device with ATA and SCSI layers
4799 * @ent: Probe information describing hardware device to be registered
4801 * This function processes the information provided in the probe
4802 * information struct @ent, allocates the necessary ATA and SCSI
4803 * host information structures, initializes them, and registers
4804 * everything with requisite kernel subsystems.
4806 * This function requests irqs, probes the ATA bus, and probes
4810 * PCI/etc. bus probe sem.
4813 * Number of ports registered. Zero on error (no ports registered).
4816 int ata_device_add(const struct ata_probe_ent *ent)
4818 unsigned int count = 0, i;
4819 struct device *dev = ent->dev;
4820 struct ata_host_set *host_set;
4823 /* alloc a container for our list of ATA ports (buses) */
4824 host_set = kzalloc(sizeof(struct ata_host_set) +
4825 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4828 spin_lock_init(&host_set->lock);
4830 host_set->dev = dev;
4831 host_set->n_ports = ent->n_ports;
4832 host_set->irq = ent->irq;
4833 host_set->mmio_base = ent->mmio_base;
4834 host_set->private_data = ent->private_data;
4835 host_set->ops = ent->port_ops;
4836 host_set->flags = ent->host_set_flags;
4838 /* register each port bound to this device */
4839 for (i = 0; i < ent->n_ports; i++) {
4840 struct ata_port *ap;
4841 unsigned long xfer_mode_mask;
4843 ap = ata_host_add(ent, host_set, i);
4847 host_set->ports[i] = ap;
4848 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4849 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4850 (ap->pio_mask << ATA_SHIFT_PIO);
4852 /* print per-port info to dmesg */
4853 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
4854 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4855 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4856 ata_mode_string(xfer_mode_mask),
4857 ap->ioaddr.cmd_addr,
4858 ap->ioaddr.ctl_addr,
4859 ap->ioaddr.bmdma_addr,
4863 host_set->ops->irq_clear(ap);
4870 /* obtain irq, that is shared between channels */
4871 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4872 DRV_NAME, host_set))
4875 /* perform each probe synchronously */
4876 DPRINTK("probe begin\n");
4877 for (i = 0; i < count; i++) {
4878 struct ata_port *ap;
4881 ap = host_set->ports[i];
4883 DPRINTK("ata%u: bus probe begin\n", ap->id);
4884 rc = ata_bus_probe(ap);
4885 DPRINTK("ata%u: bus probe end\n", ap->id);
4888 /* FIXME: do something useful here?
4889 * Current libata behavior will
4890 * tear down everything when
4891 * the module is removed
4892 * or the h/w is unplugged.
4896 rc = scsi_add_host(ap->host, dev);
4898 ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
4899 /* FIXME: do something useful here */
4900 /* FIXME: handle unconditional calls to
4901 * scsi_scan_host and ata_host_remove, below,
4907 /* probes are done, now scan each port's disk(s) */
4908 DPRINTK("host probe begin\n");
4909 for (i = 0; i < count; i++) {
4910 struct ata_port *ap = host_set->ports[i];
4912 ata_scsi_scan_host(ap);
4915 dev_set_drvdata(dev, host_set);
4917 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4918 return ent->n_ports; /* success */
4921 for (i = 0; i < count; i++) {
4922 ata_host_remove(host_set->ports[i], 1);
4923 scsi_host_put(host_set->ports[i]->host);
4927 VPRINTK("EXIT, returning 0\n");
4932 * ata_host_set_remove - PCI layer callback for device removal
4933 * @host_set: ATA host set that was removed
4935 * Unregister all objects associated with this host set. Free those
4939 * Inherited from calling layer (may sleep).
4942 void ata_host_set_remove(struct ata_host_set *host_set)
4944 struct ata_port *ap;
4947 for (i = 0; i < host_set->n_ports; i++) {
4948 ap = host_set->ports[i];
4949 scsi_remove_host(ap->host);
4952 free_irq(host_set->irq, host_set);
4954 for (i = 0; i < host_set->n_ports; i++) {
4955 ap = host_set->ports[i];
4957 ata_scsi_release(ap->host);
4959 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4960 struct ata_ioports *ioaddr = &ap->ioaddr;
4962 if (ioaddr->cmd_addr == 0x1f0)
4963 release_region(0x1f0, 8);
4964 else if (ioaddr->cmd_addr == 0x170)
4965 release_region(0x170, 8);
4968 scsi_host_put(ap->host);
4971 if (host_set->ops->host_stop)
4972 host_set->ops->host_stop(host_set);
4978 * ata_scsi_release - SCSI layer callback hook for host unload
4979 * @host: libata host to be unloaded
4981 * Performs all duties necessary to shut down a libata port...
4982 * Kill port kthread, disable port, and release resources.
4985 * Inherited from SCSI layer.
4991 int ata_scsi_release(struct Scsi_Host *host)
4993 struct ata_port *ap = ata_shost_to_port(host);
4997 ap->ops->port_disable(ap);
4998 ata_host_remove(ap, 0);
5005 * ata_std_ports - initialize ioaddr with standard port offsets.
5006 * @ioaddr: IO address structure to be initialized
5008 * Utility function which initializes data_addr, error_addr,
5009 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5010 * device_addr, status_addr, and command_addr to standard offsets
5011 * relative to cmd_addr.
5013 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5016 void ata_std_ports(struct ata_ioports *ioaddr)
5018 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
5019 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
5020 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
5021 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
5022 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
5023 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
5024 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
5025 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
5026 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
5027 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
5033 void ata_pci_host_stop (struct ata_host_set *host_set)
5035 struct pci_dev *pdev = to_pci_dev(host_set->dev);
5037 pci_iounmap(pdev, host_set->mmio_base);
5041 * ata_pci_remove_one - PCI layer callback for device removal
5042 * @pdev: PCI device that was removed
5044 * PCI layer indicates to libata via this hook that
5045 * hot-unplug or module unload event has occurred.
5046 * Handle this by unregistering all objects associated
5047 * with this PCI device. Free those objects. Then finally
5048 * release PCI resources and disable device.
5051 * Inherited from PCI layer (may sleep).
5054 void ata_pci_remove_one (struct pci_dev *pdev)
5056 struct device *dev = pci_dev_to_dev(pdev);
5057 struct ata_host_set *host_set = dev_get_drvdata(dev);
5059 ata_host_set_remove(host_set);
5060 pci_release_regions(pdev);
5061 pci_disable_device(pdev);
5062 dev_set_drvdata(dev, NULL);
5065 /* move to PCI subsystem */
5066 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5068 unsigned long tmp = 0;
5070 switch (bits->width) {
5073 pci_read_config_byte(pdev, bits->reg, &tmp8);
5079 pci_read_config_word(pdev, bits->reg, &tmp16);
5085 pci_read_config_dword(pdev, bits->reg, &tmp32);
5096 return (tmp == bits->val) ? 1 : 0;
5099 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
5101 pci_save_state(pdev);
5102 pci_disable_device(pdev);
5103 pci_set_power_state(pdev, PCI_D3hot);
5107 int ata_pci_device_resume(struct pci_dev *pdev)
5109 pci_set_power_state(pdev, PCI_D0);
5110 pci_restore_state(pdev);
5111 pci_enable_device(pdev);
5112 pci_set_master(pdev);
5115 #endif /* CONFIG_PCI */
5118 static int __init ata_init(void)
5120 ata_wq = create_workqueue("ata");
5124 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
5128 static void __exit ata_exit(void)
5130 destroy_workqueue(ata_wq);
5133 module_init(ata_init);
5134 module_exit(ata_exit);
5136 static unsigned long ratelimit_time;
5137 static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
5139 int ata_ratelimit(void)
5142 unsigned long flags;
5144 spin_lock_irqsave(&ata_ratelimit_lock, flags);
5146 if (time_after(jiffies, ratelimit_time)) {
5148 ratelimit_time = jiffies + (HZ/5);
5152 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
5158 * ata_wait_register - wait until register value changes
5159 * @reg: IO-mapped register
5160 * @mask: Mask to apply to read register value
5161 * @val: Wait condition
5162 * @interval_msec: polling interval in milliseconds
5163 * @timeout_msec: timeout in milliseconds
5165 * Waiting for some bits of register to change is a common
5166 * operation for ATA controllers. This function reads 32bit LE
5167 * IO-mapped register @reg and tests for the following condition.
5169 * (*@reg & mask) != val
5171 * If the condition is met, it returns; otherwise, the process is
5172 * repeated after @interval_msec until timeout.
5175 * Kernel thread context (may sleep)
5178 * The final register value.
5180 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
5181 unsigned long interval_msec,
5182 unsigned long timeout_msec)
5184 unsigned long timeout;
5187 tmp = ioread32(reg);
5189 /* Calculate timeout _after_ the first read to make sure
5190 * preceding writes reach the controller before starting to
5191 * eat away the timeout.
5193 timeout = jiffies + (timeout_msec * HZ) / 1000;
5195 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
5196 msleep(interval_msec);
5197 tmp = ioread32(reg);
5204 * libata is essentially a library of internal helper functions for
5205 * low-level ATA host controller drivers. As such, the API/ABI is
5206 * likely to change as new drivers are added and updated.
5207 * Do not depend on ABI/API stability.
5210 EXPORT_SYMBOL_GPL(ata_std_bios_param);
5211 EXPORT_SYMBOL_GPL(ata_std_ports);
5212 EXPORT_SYMBOL_GPL(ata_device_add);
5213 EXPORT_SYMBOL_GPL(ata_host_set_remove);
5214 EXPORT_SYMBOL_GPL(ata_sg_init);
5215 EXPORT_SYMBOL_GPL(ata_sg_init_one);
5216 EXPORT_SYMBOL_GPL(__ata_qc_complete);
5217 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
5218 EXPORT_SYMBOL_GPL(ata_tf_load);
5219 EXPORT_SYMBOL_GPL(ata_tf_read);
5220 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
5221 EXPORT_SYMBOL_GPL(ata_std_dev_select);
5222 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
5223 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
5224 EXPORT_SYMBOL_GPL(ata_check_status);
5225 EXPORT_SYMBOL_GPL(ata_altstatus);
5226 EXPORT_SYMBOL_GPL(ata_exec_command);
5227 EXPORT_SYMBOL_GPL(ata_port_start);
5228 EXPORT_SYMBOL_GPL(ata_port_stop);
5229 EXPORT_SYMBOL_GPL(ata_host_stop);
5230 EXPORT_SYMBOL_GPL(ata_interrupt);
5231 EXPORT_SYMBOL_GPL(ata_qc_prep);
5232 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
5233 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
5234 EXPORT_SYMBOL_GPL(ata_bmdma_start);
5235 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
5236 EXPORT_SYMBOL_GPL(ata_bmdma_status);
5237 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
5238 EXPORT_SYMBOL_GPL(ata_port_probe);
5239 EXPORT_SYMBOL_GPL(sata_set_spd);
5240 EXPORT_SYMBOL_GPL(sata_phy_reset);
5241 EXPORT_SYMBOL_GPL(__sata_phy_reset);
5242 EXPORT_SYMBOL_GPL(ata_bus_reset);
5243 EXPORT_SYMBOL_GPL(ata_std_probeinit);
5244 EXPORT_SYMBOL_GPL(ata_std_softreset);
5245 EXPORT_SYMBOL_GPL(sata_std_hardreset);
5246 EXPORT_SYMBOL_GPL(ata_std_postreset);
5247 EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5248 EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5249 EXPORT_SYMBOL_GPL(ata_dev_revalidate);
5250 EXPORT_SYMBOL_GPL(ata_dev_classify);
5251 EXPORT_SYMBOL_GPL(ata_dev_pair);
5252 EXPORT_SYMBOL_GPL(ata_port_disable);
5253 EXPORT_SYMBOL_GPL(ata_ratelimit);
5254 EXPORT_SYMBOL_GPL(ata_wait_register);
5255 EXPORT_SYMBOL_GPL(ata_busy_sleep);
5256 EXPORT_SYMBOL_GPL(ata_port_queue_task);
5257 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
5258 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5259 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
5260 EXPORT_SYMBOL_GPL(ata_scsi_release);
5261 EXPORT_SYMBOL_GPL(ata_host_intr);
5262 EXPORT_SYMBOL_GPL(sata_scr_valid);
5263 EXPORT_SYMBOL_GPL(sata_scr_read);
5264 EXPORT_SYMBOL_GPL(sata_scr_write);
5265 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
5266 EXPORT_SYMBOL_GPL(ata_port_online);
5267 EXPORT_SYMBOL_GPL(ata_port_offline);
5268 EXPORT_SYMBOL_GPL(ata_id_string);
5269 EXPORT_SYMBOL_GPL(ata_id_c_string);
5270 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5272 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
5273 EXPORT_SYMBOL_GPL(ata_timing_compute);
5274 EXPORT_SYMBOL_GPL(ata_timing_merge);
5277 EXPORT_SYMBOL_GPL(pci_test_config_bits);
5278 EXPORT_SYMBOL_GPL(ata_pci_host_stop);
5279 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
5280 EXPORT_SYMBOL_GPL(ata_pci_init_one);
5281 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5282 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
5283 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
5284 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
5285 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
5286 #endif /* CONFIG_PCI */
5288 EXPORT_SYMBOL_GPL(ata_device_suspend);
5289 EXPORT_SYMBOL_GPL(ata_device_resume);
5290 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
5291 EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
5293 EXPORT_SYMBOL_GPL(ata_eng_timeout);
5294 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
5295 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);