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 unsigned int tag
, preempted_tag
;
984 u32 preempted_sactive
, preempted_qc_active
;
985 DECLARE_COMPLETION(wait
);
987 unsigned int err_mask
;
990 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
992 /* no internal command while frozen */
993 if (ap
->flags
& ATA_FLAG_FROZEN
) {
994 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
995 return AC_ERR_SYSTEM
;
998 /* initialize internal qc */
1000 /* XXX: Tag 0 is used for drivers with legacy EH as some
1001 * drivers choke if any other tag is given. This breaks
1002 * ata_tag_internal() test for those drivers. Don't use new
1003 * EH stuff without converting to it.
1005 if (ap
->ops
->error_handler
)
1006 tag
= ATA_TAG_INTERNAL
;
1010 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1012 qc
= __ata_qc_from_tag(ap
, tag
);
1020 preempted_tag
= ap
->active_tag
;
1021 preempted_sactive
= ap
->sactive
;
1022 preempted_qc_active
= ap
->qc_active
;
1023 ap
->active_tag
= ATA_TAG_POISON
;
1027 /* prepare & issue qc */
1030 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1031 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1032 qc
->dma_dir
= dma_dir
;
1033 if (dma_dir
!= DMA_NONE
) {
1034 ata_sg_init_one(qc
, buf
, buflen
);
1035 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1038 qc
->private_data
= &wait
;
1039 qc
->complete_fn
= ata_qc_complete_internal
;
1043 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1045 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1047 ata_port_flush_task(ap
);
1050 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1052 /* We're racing with irq here. If we lose, the
1053 * following test prevents us from completing the qc
1054 * twice. If we win, the port is frozen and will be
1055 * cleaned up by ->post_internal_cmd().
1057 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1058 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1060 if (ap
->ops
->error_handler
)
1061 ata_port_freeze(ap
);
1063 ata_qc_complete(qc
);
1065 ata_dev_printk(dev
, KERN_WARNING
,
1066 "qc timeout (cmd 0x%x)\n", command
);
1069 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1072 /* do post_internal_cmd */
1073 if (ap
->ops
->post_internal_cmd
)
1074 ap
->ops
->post_internal_cmd(qc
);
1076 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1077 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1078 "internal command, assuming AC_ERR_OTHER\n");
1079 qc
->err_mask
|= AC_ERR_OTHER
;
1083 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1085 *tf
= qc
->result_tf
;
1086 err_mask
= qc
->err_mask
;
1089 ap
->active_tag
= preempted_tag
;
1090 ap
->sactive
= preempted_sactive
;
1091 ap
->qc_active
= preempted_qc_active
;
1093 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1094 * Until those drivers are fixed, we detect the condition
1095 * here, fail the command with AC_ERR_SYSTEM and reenable the
1098 * Note that this doesn't change any behavior as internal
1099 * command failure results in disabling the device in the
1100 * higher layer for LLDDs without new reset/EH callbacks.
1102 * Kill the following code as soon as those drivers are fixed.
1104 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1105 err_mask
|= AC_ERR_SYSTEM
;
1109 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1115 * ata_pio_need_iordy - check if iordy needed
1118 * Check if the current speed of the device requires IORDY. Used
1119 * by various controllers for chip configuration.
1122 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1125 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1132 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1134 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1135 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1136 /* Is the speed faster than the drive allows non IORDY ? */
1138 /* This is cycle times not frequency - watch the logic! */
1139 if (pio
> 240) /* PIO2 is 240nS per cycle */
1148 * ata_dev_read_id - Read ID data from the specified device
1149 * @dev: target device
1150 * @p_class: pointer to class of the target device (may be changed)
1151 * @post_reset: is this read ID post-reset?
1152 * @id: buffer to read IDENTIFY data into
1154 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1155 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1156 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1157 * for pre-ATA4 drives.
1160 * Kernel thread context (may sleep)
1163 * 0 on success, -errno otherwise.
1165 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1166 int post_reset
, u16
*id
)
1168 struct ata_port
*ap
= dev
->ap
;
1169 unsigned int class = *p_class
;
1170 struct ata_taskfile tf
;
1171 unsigned int err_mask
= 0;
1175 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1177 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1180 ata_tf_init(dev
, &tf
);
1184 tf
.command
= ATA_CMD_ID_ATA
;
1187 tf
.command
= ATA_CMD_ID_ATAPI
;
1191 reason
= "unsupported class";
1195 tf
.protocol
= ATA_PROT_PIO
;
1197 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1198 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1201 reason
= "I/O error";
1205 swap_buf_le16(id
, ATA_ID_WORDS
);
1208 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1210 reason
= "device reports illegal type";
1214 if (post_reset
&& class == ATA_DEV_ATA
) {
1216 * The exact sequence expected by certain pre-ATA4 drives is:
1219 * INITIALIZE DEVICE PARAMETERS
1221 * Some drives were very specific about that exact sequence.
1223 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1224 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1227 reason
= "INIT_DEV_PARAMS failed";
1231 /* current CHS translation info (id[53-58]) might be
1232 * changed. reread the identify device info.
1244 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1245 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1249 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1251 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1255 * ata_dev_configure - Configure the specified ATA/ATAPI device
1256 * @dev: Target device to configure
1257 * @print_info: Enable device info printout
1259 * Configure @dev according to @dev->id. Generic and low-level
1260 * driver specific fixups are also applied.
1263 * Kernel thread context (may sleep)
1266 * 0 on success, -errno otherwise
1268 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1270 struct ata_port
*ap
= dev
->ap
;
1271 const u16
*id
= dev
->id
;
1272 unsigned int xfer_mask
;
1275 if (!ata_dev_enabled(dev
)) {
1276 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1277 ap
->id
, dev
->devno
);
1281 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1283 /* print device capabilities */
1285 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1286 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1287 id
[49], id
[82], id
[83], id
[84],
1288 id
[85], id
[86], id
[87], id
[88]);
1290 /* initialize to-be-configured parameters */
1291 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1292 dev
->max_sectors
= 0;
1300 * common ATA, ATAPI feature tests
1303 /* find max transfer mode; for printk only */
1304 xfer_mask
= ata_id_xfermask(id
);
1308 /* ATA-specific feature tests */
1309 if (dev
->class == ATA_DEV_ATA
) {
1310 dev
->n_sectors
= ata_id_n_sectors(id
);
1312 if (ata_id_has_lba(id
)) {
1313 const char *lba_desc
;
1316 dev
->flags
|= ATA_DFLAG_LBA
;
1317 if (ata_id_has_lba48(id
)) {
1318 dev
->flags
|= ATA_DFLAG_LBA48
;
1322 /* print device info to dmesg */
1324 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1325 "max %s, %Lu sectors: %s\n",
1326 ata_id_major_version(id
),
1327 ata_mode_string(xfer_mask
),
1328 (unsigned long long)dev
->n_sectors
,
1333 /* Default translation */
1334 dev
->cylinders
= id
[1];
1336 dev
->sectors
= id
[6];
1338 if (ata_id_current_chs_valid(id
)) {
1339 /* Current CHS translation is valid. */
1340 dev
->cylinders
= id
[54];
1341 dev
->heads
= id
[55];
1342 dev
->sectors
= id
[56];
1345 /* print device info to dmesg */
1347 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1348 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1349 ata_id_major_version(id
),
1350 ata_mode_string(xfer_mask
),
1351 (unsigned long long)dev
->n_sectors
,
1352 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1355 if (dev
->id
[59] & 0x100) {
1356 dev
->multi_count
= dev
->id
[59] & 0xff;
1357 DPRINTK("ata%u: dev %u multi count %u\n",
1358 ap
->id
, dev
->devno
, dev
->multi_count
);
1364 /* ATAPI-specific feature tests */
1365 else if (dev
->class == ATA_DEV_ATAPI
) {
1366 char *cdb_intr_string
= "";
1368 rc
= atapi_cdb_len(id
);
1369 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1370 ata_dev_printk(dev
, KERN_WARNING
,
1371 "unsupported CDB len\n");
1375 dev
->cdb_len
= (unsigned int) rc
;
1377 if (ata_id_cdb_intr(dev
->id
)) {
1378 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1379 cdb_intr_string
= ", CDB intr";
1382 /* print device info to dmesg */
1384 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1385 ata_mode_string(xfer_mask
),
1389 ap
->host
->max_cmd_len
= 0;
1390 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1391 ap
->host
->max_cmd_len
= max_t(unsigned int,
1392 ap
->host
->max_cmd_len
,
1393 ap
->device
[i
].cdb_len
);
1395 /* limit bridge transfers to udma5, 200 sectors */
1396 if (ata_dev_knobble(dev
)) {
1398 ata_dev_printk(dev
, KERN_INFO
,
1399 "applying bridge limits\n");
1400 dev
->udma_mask
&= ATA_UDMA5
;
1401 dev
->max_sectors
= ATA_MAX_SECTORS
;
1404 if (ap
->ops
->dev_config
)
1405 ap
->ops
->dev_config(ap
, dev
);
1407 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1411 DPRINTK("EXIT, err\n");
1416 * ata_bus_probe - Reset and probe ATA bus
1419 * Master ATA bus probing function. Initiates a hardware-dependent
1420 * bus reset, then attempts to identify any devices found on
1424 * PCI/etc. bus probe sem.
1427 * Zero on success, negative errno otherwise.
1430 static int ata_bus_probe(struct ata_port
*ap
)
1432 unsigned int classes
[ATA_MAX_DEVICES
];
1433 int tries
[ATA_MAX_DEVICES
];
1434 int i
, rc
, down_xfermask
;
1435 struct ata_device
*dev
;
1439 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1440 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1445 /* reset and determine device classes */
1446 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1447 classes
[i
] = ATA_DEV_UNKNOWN
;
1449 if (ap
->ops
->probe_reset
) {
1450 rc
= ap
->ops
->probe_reset(ap
, classes
);
1452 ata_port_printk(ap
, KERN_ERR
,
1453 "reset failed (errno=%d)\n", rc
);
1457 ap
->ops
->phy_reset(ap
);
1459 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1460 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1461 classes
[i
] = ap
->device
[i
].class;
1462 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1468 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1469 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1470 classes
[i
] = ATA_DEV_NONE
;
1472 /* read IDENTIFY page and configure devices */
1473 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1474 dev
= &ap
->device
[i
];
1477 dev
->class = classes
[i
];
1479 if (!ata_dev_enabled(dev
))
1482 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1486 rc
= ata_dev_configure(dev
, 1);
1491 /* configure transfer mode */
1492 rc
= ata_set_mode(ap
, &dev
);
1498 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1499 if (ata_dev_enabled(&ap
->device
[i
]))
1502 /* no device present, disable port */
1503 ata_port_disable(ap
);
1504 ap
->ops
->port_disable(ap
);
1511 tries
[dev
->devno
] = 0;
1514 sata_down_spd_limit(ap
);
1517 tries
[dev
->devno
]--;
1518 if (down_xfermask
&&
1519 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1520 tries
[dev
->devno
] = 0;
1523 if (!tries
[dev
->devno
]) {
1524 ata_down_xfermask_limit(dev
, 1);
1525 ata_dev_disable(dev
);
1532 * ata_port_probe - Mark port as enabled
1533 * @ap: Port for which we indicate enablement
1535 * Modify @ap data structure such that the system
1536 * thinks that the entire port is enabled.
1538 * LOCKING: host_set lock, or some other form of
1542 void ata_port_probe(struct ata_port
*ap
)
1544 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1548 * sata_print_link_status - Print SATA link status
1549 * @ap: SATA port to printk link status about
1551 * This function prints link speed and status of a SATA link.
1556 static void sata_print_link_status(struct ata_port
*ap
)
1558 u32 sstatus
, scontrol
, tmp
;
1560 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1562 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1564 if (ata_port_online(ap
)) {
1565 tmp
= (sstatus
>> 4) & 0xf;
1566 ata_port_printk(ap
, KERN_INFO
,
1567 "SATA link up %s (SStatus %X SControl %X)\n",
1568 sata_spd_string(tmp
), sstatus
, scontrol
);
1570 ata_port_printk(ap
, KERN_INFO
,
1571 "SATA link down (SStatus %X SControl %X)\n",
1577 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1578 * @ap: SATA port associated with target SATA PHY.
1580 * This function issues commands to standard SATA Sxxx
1581 * PHY registers, to wake up the phy (and device), and
1582 * clear any reset condition.
1585 * PCI/etc. bus probe sem.
1588 void __sata_phy_reset(struct ata_port
*ap
)
1591 unsigned long timeout
= jiffies
+ (HZ
* 5);
1593 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1594 /* issue phy wake/reset */
1595 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1596 /* Couldn't find anything in SATA I/II specs, but
1597 * AHCI-1.1 10.4.2 says at least 1 ms. */
1600 /* phy wake/clear reset */
1601 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1603 /* wait for phy to become ready, if necessary */
1606 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1607 if ((sstatus
& 0xf) != 1)
1609 } while (time_before(jiffies
, timeout
));
1611 /* print link status */
1612 sata_print_link_status(ap
);
1614 /* TODO: phy layer with polling, timeouts, etc. */
1615 if (!ata_port_offline(ap
))
1618 ata_port_disable(ap
);
1620 if (ap
->flags
& ATA_FLAG_DISABLED
)
1623 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1624 ata_port_disable(ap
);
1628 ap
->cbl
= ATA_CBL_SATA
;
1632 * sata_phy_reset - Reset SATA bus.
1633 * @ap: SATA port associated with target SATA PHY.
1635 * This function resets the SATA bus, and then probes
1636 * the bus for devices.
1639 * PCI/etc. bus probe sem.
1642 void sata_phy_reset(struct ata_port
*ap
)
1644 __sata_phy_reset(ap
);
1645 if (ap
->flags
& ATA_FLAG_DISABLED
)
1651 * ata_dev_pair - return other device on cable
1654 * Obtain the other device on the same cable, or if none is
1655 * present NULL is returned
1658 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1660 struct ata_port
*ap
= adev
->ap
;
1661 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1662 if (!ata_dev_enabled(pair
))
1668 * ata_port_disable - Disable port.
1669 * @ap: Port to be disabled.
1671 * Modify @ap data structure such that the system
1672 * thinks that the entire port is disabled, and should
1673 * never attempt to probe or communicate with devices
1676 * LOCKING: host_set lock, or some other form of
1680 void ata_port_disable(struct ata_port
*ap
)
1682 ap
->device
[0].class = ATA_DEV_NONE
;
1683 ap
->device
[1].class = ATA_DEV_NONE
;
1684 ap
->flags
|= ATA_FLAG_DISABLED
;
1688 * sata_down_spd_limit - adjust SATA spd limit downward
1689 * @ap: Port to adjust SATA spd limit for
1691 * Adjust SATA spd limit of @ap downward. Note that this
1692 * function only adjusts the limit. The change must be applied
1693 * using sata_set_spd().
1696 * Inherited from caller.
1699 * 0 on success, negative errno on failure
1701 int sata_down_spd_limit(struct ata_port
*ap
)
1703 u32 sstatus
, spd
, mask
;
1706 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1710 mask
= ap
->sata_spd_limit
;
1713 highbit
= fls(mask
) - 1;
1714 mask
&= ~(1 << highbit
);
1716 spd
= (sstatus
>> 4) & 0xf;
1720 mask
&= (1 << spd
) - 1;
1724 ap
->sata_spd_limit
= mask
;
1726 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1727 sata_spd_string(fls(mask
)));
1732 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1736 if (ap
->sata_spd_limit
== UINT_MAX
)
1739 limit
= fls(ap
->sata_spd_limit
);
1741 spd
= (*scontrol
>> 4) & 0xf;
1742 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1744 return spd
!= limit
;
1748 * sata_set_spd_needed - is SATA spd configuration needed
1749 * @ap: Port in question
1751 * Test whether the spd limit in SControl matches
1752 * @ap->sata_spd_limit. This function is used to determine
1753 * whether hardreset is necessary to apply SATA spd
1757 * Inherited from caller.
1760 * 1 if SATA spd configuration is needed, 0 otherwise.
1762 int sata_set_spd_needed(struct ata_port
*ap
)
1766 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1769 return __sata_set_spd_needed(ap
, &scontrol
);
1773 * sata_set_spd - set SATA spd according to spd limit
1774 * @ap: Port to set SATA spd for
1776 * Set SATA spd of @ap according to sata_spd_limit.
1779 * Inherited from caller.
1782 * 0 if spd doesn't need to be changed, 1 if spd has been
1783 * changed. Negative errno if SCR registers are inaccessible.
1785 int sata_set_spd(struct ata_port
*ap
)
1790 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1793 if (!__sata_set_spd_needed(ap
, &scontrol
))
1796 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1803 * This mode timing computation functionality is ported over from
1804 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1807 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1808 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1809 * for PIO 5, which is a nonstandard extension and UDMA6, which
1810 * is currently supported only by Maxtor drives.
1813 static const struct ata_timing ata_timing
[] = {
1815 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1816 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1817 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1818 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1820 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1821 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1822 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1824 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1826 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1827 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1828 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1830 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1831 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1832 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1834 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1835 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1836 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1838 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1839 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1840 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1842 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1847 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1848 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1850 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1852 q
->setup
= EZ(t
->setup
* 1000, T
);
1853 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1854 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1855 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1856 q
->active
= EZ(t
->active
* 1000, T
);
1857 q
->recover
= EZ(t
->recover
* 1000, T
);
1858 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1859 q
->udma
= EZ(t
->udma
* 1000, UT
);
1862 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1863 struct ata_timing
*m
, unsigned int what
)
1865 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1866 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1867 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1868 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1869 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1870 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1871 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1872 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1875 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1877 const struct ata_timing
*t
;
1879 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1880 if (t
->mode
== 0xFF)
1885 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1886 struct ata_timing
*t
, int T
, int UT
)
1888 const struct ata_timing
*s
;
1889 struct ata_timing p
;
1895 if (!(s
= ata_timing_find_mode(speed
)))
1898 memcpy(t
, s
, sizeof(*s
));
1901 * If the drive is an EIDE drive, it can tell us it needs extended
1902 * PIO/MW_DMA cycle timing.
1905 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1906 memset(&p
, 0, sizeof(p
));
1907 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1908 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1909 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1910 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1911 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1913 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1917 * Convert the timing to bus clock counts.
1920 ata_timing_quantize(t
, t
, T
, UT
);
1923 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1924 * S.M.A.R.T * and some other commands. We have to ensure that the
1925 * DMA cycle timing is slower/equal than the fastest PIO timing.
1928 if (speed
> XFER_PIO_4
) {
1929 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1930 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1934 * Lengthen active & recovery time so that cycle time is correct.
1937 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1938 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1939 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1942 if (t
->active
+ t
->recover
< t
->cycle
) {
1943 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1944 t
->recover
= t
->cycle
- t
->active
;
1951 * ata_down_xfermask_limit - adjust dev xfer masks downward
1952 * @dev: Device to adjust xfer masks
1953 * @force_pio0: Force PIO0
1955 * Adjust xfer masks of @dev downward. Note that this function
1956 * does not apply the change. Invoking ata_set_mode() afterwards
1957 * will apply the limit.
1960 * Inherited from caller.
1963 * 0 on success, negative errno on failure
1965 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1967 unsigned long xfer_mask
;
1970 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1975 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1976 if (xfer_mask
& ATA_MASK_UDMA
)
1977 xfer_mask
&= ~ATA_MASK_MWDMA
;
1979 highbit
= fls(xfer_mask
) - 1;
1980 xfer_mask
&= ~(1 << highbit
);
1982 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1986 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1989 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
1990 ata_mode_string(xfer_mask
));
1998 static int ata_dev_set_mode(struct ata_device
*dev
)
2000 unsigned int err_mask
;
2003 dev
->flags
&= ~ATA_DFLAG_PIO
;
2004 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2005 dev
->flags
|= ATA_DFLAG_PIO
;
2007 err_mask
= ata_dev_set_xfermode(dev
);
2009 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2010 "(err_mask=0x%x)\n", err_mask
);
2014 rc
= ata_dev_revalidate(dev
, 0);
2018 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2019 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2021 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2022 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2027 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2028 * @ap: port on which timings will be programmed
2029 * @r_failed_dev: out paramter for failed device
2031 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2032 * ata_set_mode() fails, pointer to the failing device is
2033 * returned in @r_failed_dev.
2036 * PCI/etc. bus probe sem.
2039 * 0 on success, negative errno otherwise
2041 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2043 struct ata_device
*dev
;
2044 int i
, rc
= 0, used_dma
= 0, found
= 0;
2046 /* has private set_mode? */
2047 if (ap
->ops
->set_mode
) {
2048 /* FIXME: make ->set_mode handle no device case and
2049 * return error code and failing device on failure.
2051 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2052 if (ata_dev_enabled(&ap
->device
[i
])) {
2053 ap
->ops
->set_mode(ap
);
2060 /* step 1: calculate xfer_mask */
2061 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2062 unsigned int pio_mask
, dma_mask
;
2064 dev
= &ap
->device
[i
];
2066 if (!ata_dev_enabled(dev
))
2069 ata_dev_xfermask(dev
);
2071 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2072 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2073 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2074 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2083 /* step 2: always set host PIO timings */
2084 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2085 dev
= &ap
->device
[i
];
2086 if (!ata_dev_enabled(dev
))
2089 if (!dev
->pio_mode
) {
2090 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2095 dev
->xfer_mode
= dev
->pio_mode
;
2096 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2097 if (ap
->ops
->set_piomode
)
2098 ap
->ops
->set_piomode(ap
, dev
);
2101 /* step 3: set host DMA timings */
2102 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2103 dev
= &ap
->device
[i
];
2105 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2108 dev
->xfer_mode
= dev
->dma_mode
;
2109 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2110 if (ap
->ops
->set_dmamode
)
2111 ap
->ops
->set_dmamode(ap
, dev
);
2114 /* step 4: update devices' xfer mode */
2115 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2116 dev
= &ap
->device
[i
];
2118 if (!ata_dev_enabled(dev
))
2121 rc
= ata_dev_set_mode(dev
);
2126 /* Record simplex status. If we selected DMA then the other
2127 * host channels are not permitted to do so.
2129 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2130 ap
->host_set
->simplex_claimed
= 1;
2132 /* step5: chip specific finalisation */
2133 if (ap
->ops
->post_set_mode
)
2134 ap
->ops
->post_set_mode(ap
);
2138 *r_failed_dev
= dev
;
2143 * ata_tf_to_host - issue ATA taskfile to host controller
2144 * @ap: port to which command is being issued
2145 * @tf: ATA taskfile register set
2147 * Issues ATA taskfile register set to ATA host controller,
2148 * with proper synchronization with interrupt handler and
2152 * spin_lock_irqsave(host_set lock)
2155 static inline void ata_tf_to_host(struct ata_port
*ap
,
2156 const struct ata_taskfile
*tf
)
2158 ap
->ops
->tf_load(ap
, tf
);
2159 ap
->ops
->exec_command(ap
, tf
);
2163 * ata_busy_sleep - sleep until BSY clears, or timeout
2164 * @ap: port containing status register to be polled
2165 * @tmout_pat: impatience timeout
2166 * @tmout: overall timeout
2168 * Sleep until ATA Status register bit BSY clears,
2169 * or a timeout occurs.
2174 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2175 unsigned long tmout_pat
, unsigned long tmout
)
2177 unsigned long timer_start
, timeout
;
2180 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2181 timer_start
= jiffies
;
2182 timeout
= timer_start
+ tmout_pat
;
2183 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2185 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2188 if (status
& ATA_BUSY
)
2189 ata_port_printk(ap
, KERN_WARNING
,
2190 "port is slow to respond, please be patient\n");
2192 timeout
= timer_start
+ tmout
;
2193 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2195 status
= ata_chk_status(ap
);
2198 if (status
& ATA_BUSY
) {
2199 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2200 "(%lu secs)\n", tmout
/ HZ
);
2207 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2209 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2210 unsigned int dev0
= devmask
& (1 << 0);
2211 unsigned int dev1
= devmask
& (1 << 1);
2212 unsigned long timeout
;
2214 /* if device 0 was found in ata_devchk, wait for its
2218 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2220 /* if device 1 was found in ata_devchk, wait for
2221 * register access, then wait for BSY to clear
2223 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2227 ap
->ops
->dev_select(ap
, 1);
2228 if (ap
->flags
& ATA_FLAG_MMIO
) {
2229 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2230 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2232 nsect
= inb(ioaddr
->nsect_addr
);
2233 lbal
= inb(ioaddr
->lbal_addr
);
2235 if ((nsect
== 1) && (lbal
== 1))
2237 if (time_after(jiffies
, timeout
)) {
2241 msleep(50); /* give drive a breather */
2244 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2246 /* is all this really necessary? */
2247 ap
->ops
->dev_select(ap
, 0);
2249 ap
->ops
->dev_select(ap
, 1);
2251 ap
->ops
->dev_select(ap
, 0);
2254 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2255 unsigned int devmask
)
2257 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2259 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2261 /* software reset. causes dev0 to be selected */
2262 if (ap
->flags
& ATA_FLAG_MMIO
) {
2263 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2264 udelay(20); /* FIXME: flush */
2265 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2266 udelay(20); /* FIXME: flush */
2267 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2269 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2271 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2273 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2276 /* spec mandates ">= 2ms" before checking status.
2277 * We wait 150ms, because that was the magic delay used for
2278 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2279 * between when the ATA command register is written, and then
2280 * status is checked. Because waiting for "a while" before
2281 * checking status is fine, post SRST, we perform this magic
2282 * delay here as well.
2284 * Old drivers/ide uses the 2mS rule and then waits for ready
2288 /* Before we perform post reset processing we want to see if
2289 * the bus shows 0xFF because the odd clown forgets the D7
2290 * pulldown resistor.
2292 if (ata_check_status(ap
) == 0xFF) {
2293 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2294 return AC_ERR_OTHER
;
2297 ata_bus_post_reset(ap
, devmask
);
2303 * ata_bus_reset - reset host port and associated ATA channel
2304 * @ap: port to reset
2306 * This is typically the first time we actually start issuing
2307 * commands to the ATA channel. We wait for BSY to clear, then
2308 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2309 * result. Determine what devices, if any, are on the channel
2310 * by looking at the device 0/1 error register. Look at the signature
2311 * stored in each device's taskfile registers, to determine if
2312 * the device is ATA or ATAPI.
2315 * PCI/etc. bus probe sem.
2316 * Obtains host_set lock.
2319 * Sets ATA_FLAG_DISABLED if bus reset fails.
2322 void ata_bus_reset(struct ata_port
*ap
)
2324 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2325 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2327 unsigned int dev0
, dev1
= 0, devmask
= 0;
2329 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2331 /* determine if device 0/1 are present */
2332 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2335 dev0
= ata_devchk(ap
, 0);
2337 dev1
= ata_devchk(ap
, 1);
2341 devmask
|= (1 << 0);
2343 devmask
|= (1 << 1);
2345 /* select device 0 again */
2346 ap
->ops
->dev_select(ap
, 0);
2348 /* issue bus reset */
2349 if (ap
->flags
& ATA_FLAG_SRST
)
2350 if (ata_bus_softreset(ap
, devmask
))
2354 * determine by signature whether we have ATA or ATAPI devices
2356 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2357 if ((slave_possible
) && (err
!= 0x81))
2358 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2360 /* re-enable interrupts */
2361 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2364 /* is double-select really necessary? */
2365 if (ap
->device
[1].class != ATA_DEV_NONE
)
2366 ap
->ops
->dev_select(ap
, 1);
2367 if (ap
->device
[0].class != ATA_DEV_NONE
)
2368 ap
->ops
->dev_select(ap
, 0);
2370 /* if no devices were detected, disable this port */
2371 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2372 (ap
->device
[1].class == ATA_DEV_NONE
))
2375 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2376 /* set up device control for ATA_FLAG_SATA_RESET */
2377 if (ap
->flags
& ATA_FLAG_MMIO
)
2378 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2380 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2387 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2388 ap
->ops
->port_disable(ap
);
2393 static int sata_phy_resume(struct ata_port
*ap
)
2395 unsigned long timeout
= jiffies
+ (HZ
* 5);
2396 u32 scontrol
, sstatus
;
2399 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2402 scontrol
= (scontrol
& 0x0f0) | 0x300;
2404 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2407 /* Wait for phy to become ready, if necessary. */
2410 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2412 if ((sstatus
& 0xf) != 1)
2414 } while (time_before(jiffies
, timeout
));
2420 * ata_std_probeinit - initialize probing
2421 * @ap: port to be probed
2423 * @ap is about to be probed. Initialize it. This function is
2424 * to be used as standard callback for ata_drive_probe_reset().
2426 * NOTE!!! Do not use this function as probeinit if a low level
2427 * driver implements only hardreset. Just pass NULL as probeinit
2428 * in that case. Using this function is probably okay but doing
2429 * so makes reset sequence different from the original
2430 * ->phy_reset implementation and Jeff nervous. :-P
2432 void ata_std_probeinit(struct ata_port
*ap
)
2437 sata_phy_resume(ap
);
2439 /* init sata_spd_limit to the current value */
2440 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2441 int spd
= (scontrol
>> 4) & 0xf;
2442 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2445 /* wait for device */
2446 if (ata_port_online(ap
))
2447 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2451 * ata_std_softreset - reset host port via ATA SRST
2452 * @ap: port to reset
2453 * @classes: resulting classes of attached devices
2455 * Reset host port using ATA SRST. This function is to be used
2456 * as standard callback for ata_drive_*_reset() functions.
2459 * Kernel thread context (may sleep)
2462 * 0 on success, -errno otherwise.
2464 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2466 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2467 unsigned int devmask
= 0, err_mask
;
2472 if (ata_port_offline(ap
)) {
2473 classes
[0] = ATA_DEV_NONE
;
2477 /* determine if device 0/1 are present */
2478 if (ata_devchk(ap
, 0))
2479 devmask
|= (1 << 0);
2480 if (slave_possible
&& ata_devchk(ap
, 1))
2481 devmask
|= (1 << 1);
2483 /* select device 0 again */
2484 ap
->ops
->dev_select(ap
, 0);
2486 /* issue bus reset */
2487 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2488 err_mask
= ata_bus_softreset(ap
, devmask
);
2490 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2495 /* determine by signature whether we have ATA or ATAPI devices */
2496 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2497 if (slave_possible
&& err
!= 0x81)
2498 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2501 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2506 * sata_std_hardreset - reset host port via SATA phy reset
2507 * @ap: port to reset
2508 * @class: resulting class of attached device
2510 * SATA phy-reset host port using DET bits of SControl register.
2511 * This function is to be used as standard callback for
2512 * ata_drive_*_reset().
2515 * Kernel thread context (may sleep)
2518 * 0 on success, -errno otherwise.
2520 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2527 if (sata_set_spd_needed(ap
)) {
2528 /* SATA spec says nothing about how to reconfigure
2529 * spd. To be on the safe side, turn off phy during
2530 * reconfiguration. This works for at least ICH7 AHCI
2533 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2536 scontrol
= (scontrol
& 0x0f0) | 0x302;
2538 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2544 /* issue phy wake/reset */
2545 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2548 scontrol
= (scontrol
& 0x0f0) | 0x301;
2550 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2553 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2554 * 10.4.2 says at least 1 ms.
2558 /* bring phy back */
2559 sata_phy_resume(ap
);
2561 /* TODO: phy layer with polling, timeouts, etc. */
2562 if (ata_port_offline(ap
)) {
2563 *class = ATA_DEV_NONE
;
2564 DPRINTK("EXIT, link offline\n");
2568 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2569 ata_port_printk(ap
, KERN_ERR
,
2570 "COMRESET failed (device not ready)\n");
2574 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2576 *class = ata_dev_try_classify(ap
, 0, NULL
);
2578 DPRINTK("EXIT, class=%u\n", *class);
2583 * ata_std_postreset - standard postreset callback
2584 * @ap: the target ata_port
2585 * @classes: classes of attached devices
2587 * This function is invoked after a successful reset. Note that
2588 * the device might have been reset more than once using
2589 * different reset methods before postreset is invoked.
2591 * This function is to be used as standard callback for
2592 * ata_drive_*_reset().
2595 * Kernel thread context (may sleep)
2597 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2603 /* print link status */
2604 sata_print_link_status(ap
);
2607 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2608 sata_scr_write(ap
, SCR_ERROR
, serror
);
2610 /* re-enable interrupts */
2611 if (!ap
->ops
->error_handler
) {
2612 /* FIXME: hack. create a hook instead */
2613 if (ap
->ioaddr
.ctl_addr
)
2617 /* is double-select really necessary? */
2618 if (classes
[0] != ATA_DEV_NONE
)
2619 ap
->ops
->dev_select(ap
, 1);
2620 if (classes
[1] != ATA_DEV_NONE
)
2621 ap
->ops
->dev_select(ap
, 0);
2623 /* bail out if no device is present */
2624 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2625 DPRINTK("EXIT, no device\n");
2629 /* set up device control */
2630 if (ap
->ioaddr
.ctl_addr
) {
2631 if (ap
->flags
& ATA_FLAG_MMIO
)
2632 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2634 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2641 * ata_std_probe_reset - standard probe reset method
2642 * @ap: prot to perform probe-reset
2643 * @classes: resulting classes of attached devices
2645 * The stock off-the-shelf ->probe_reset method.
2648 * Kernel thread context (may sleep)
2651 * 0 on success, -errno otherwise.
2653 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2655 ata_reset_fn_t hardreset
;
2658 if (sata_scr_valid(ap
))
2659 hardreset
= sata_std_hardreset
;
2661 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2662 ata_std_softreset
, hardreset
,
2663 ata_std_postreset
, classes
);
2666 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2667 unsigned int *classes
)
2671 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2672 classes
[i
] = ATA_DEV_UNKNOWN
;
2674 rc
= reset(ap
, classes
);
2678 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2679 * is complete and convert all ATA_DEV_UNKNOWN to
2682 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2683 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2686 if (i
< ATA_MAX_DEVICES
)
2687 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2688 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2689 classes
[i
] = ATA_DEV_NONE
;
2695 * ata_drive_probe_reset - Perform probe reset with given methods
2696 * @ap: port to reset
2697 * @probeinit: probeinit method (can be NULL)
2698 * @softreset: softreset method (can be NULL)
2699 * @hardreset: hardreset method (can be NULL)
2700 * @postreset: postreset method (can be NULL)
2701 * @classes: resulting classes of attached devices
2703 * Reset the specified port and classify attached devices using
2704 * given methods. This function prefers softreset but tries all
2705 * possible reset sequences to reset and classify devices. This
2706 * function is intended to be used for constructing ->probe_reset
2707 * callback by low level drivers.
2709 * Reset methods should follow the following rules.
2711 * - Return 0 on sucess, -errno on failure.
2712 * - If classification is supported, fill classes[] with
2713 * recognized class codes.
2714 * - If classification is not supported, leave classes[] alone.
2717 * Kernel thread context (may sleep)
2720 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2721 * if classification fails, and any error code from reset
2724 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2725 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2726 ata_postreset_fn_t postreset
, unsigned int *classes
)
2730 ata_eh_freeze_port(ap
);
2735 if (softreset
&& !sata_set_spd_needed(ap
)) {
2736 rc
= ata_do_reset(ap
, softreset
, classes
);
2737 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2739 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2740 "will try hardreset in 5 secs\n");
2748 rc
= ata_do_reset(ap
, hardreset
, classes
);
2750 if (classes
[0] != ATA_DEV_UNKNOWN
)
2755 if (sata_down_spd_limit(ap
))
2758 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2759 "will retry in 5 secs\n");
2764 ata_port_printk(ap
, KERN_INFO
,
2765 "hardreset succeeded without classification, "
2766 "will retry softreset in 5 secs\n");
2769 rc
= ata_do_reset(ap
, softreset
, classes
);
2775 postreset(ap
, classes
);
2777 ata_eh_thaw_port(ap
);
2779 if (classes
[0] == ATA_DEV_UNKNOWN
)
2786 * ata_dev_same_device - Determine whether new ID matches configured device
2787 * @dev: device to compare against
2788 * @new_class: class of the new device
2789 * @new_id: IDENTIFY page of the new device
2791 * Compare @new_class and @new_id against @dev and determine
2792 * whether @dev is the device indicated by @new_class and
2799 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2801 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2804 const u16
*old_id
= dev
->id
;
2805 unsigned char model
[2][41], serial
[2][21];
2808 if (dev
->class != new_class
) {
2809 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2810 dev
->class, new_class
);
2814 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2815 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2816 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2817 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2818 new_n_sectors
= ata_id_n_sectors(new_id
);
2820 if (strcmp(model
[0], model
[1])) {
2821 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2822 "'%s' != '%s'\n", model
[0], model
[1]);
2826 if (strcmp(serial
[0], serial
[1])) {
2827 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2828 "'%s' != '%s'\n", serial
[0], serial
[1]);
2832 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2833 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2835 (unsigned long long)dev
->n_sectors
,
2836 (unsigned long long)new_n_sectors
);
2844 * ata_dev_revalidate - Revalidate ATA device
2845 * @dev: device to revalidate
2846 * @post_reset: is this revalidation after reset?
2848 * Re-read IDENTIFY page and make sure @dev is still attached to
2852 * Kernel thread context (may sleep)
2855 * 0 on success, negative errno otherwise
2857 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2859 unsigned int class = dev
->class;
2860 u16
*id
= (void *)dev
->ap
->sector_buf
;
2863 if (!ata_dev_enabled(dev
)) {
2869 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2873 /* is the device still there? */
2874 if (!ata_dev_same_device(dev
, class, id
)) {
2879 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2881 /* configure device according to the new ID */
2882 rc
= ata_dev_configure(dev
, 0);
2887 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2891 static const char * const ata_dma_blacklist
[] = {
2892 "WDC AC11000H", NULL
,
2893 "WDC AC22100H", NULL
,
2894 "WDC AC32500H", NULL
,
2895 "WDC AC33100H", NULL
,
2896 "WDC AC31600H", NULL
,
2897 "WDC AC32100H", "24.09P07",
2898 "WDC AC23200L", "21.10N21",
2899 "Compaq CRD-8241B", NULL
,
2904 "SanDisk SDP3B", NULL
,
2905 "SanDisk SDP3B-64", NULL
,
2906 "SANYO CD-ROM CRD", NULL
,
2907 "HITACHI CDR-8", NULL
,
2908 "HITACHI CDR-8335", NULL
,
2909 "HITACHI CDR-8435", NULL
,
2910 "Toshiba CD-ROM XM-6202B", NULL
,
2911 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2913 "E-IDE CD-ROM CR-840", NULL
,
2914 "CD-ROM Drive/F5A", NULL
,
2915 "WPI CDD-820", NULL
,
2916 "SAMSUNG CD-ROM SC-148C", NULL
,
2917 "SAMSUNG CD-ROM SC", NULL
,
2918 "SanDisk SDP3B-64", NULL
,
2919 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2920 "_NEC DV5800A", NULL
,
2921 "SAMSUNG CD-ROM SN-124", "N001"
2924 static int ata_strim(char *s
, size_t len
)
2926 len
= strnlen(s
, len
);
2928 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2929 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2936 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2938 unsigned char model_num
[40];
2939 unsigned char model_rev
[16];
2940 unsigned int nlen
, rlen
;
2943 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2945 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2947 nlen
= ata_strim(model_num
, sizeof(model_num
));
2948 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2950 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2951 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2952 if (ata_dma_blacklist
[i
+1] == NULL
)
2954 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2962 * ata_dev_xfermask - Compute supported xfermask of the given device
2963 * @dev: Device to compute xfermask for
2965 * Compute supported xfermask of @dev and store it in
2966 * dev->*_mask. This function is responsible for applying all
2967 * known limits including host controller limits, device
2970 * FIXME: The current implementation limits all transfer modes to
2971 * the fastest of the lowested device on the port. This is not
2972 * required on most controllers.
2977 static void ata_dev_xfermask(struct ata_device
*dev
)
2979 struct ata_port
*ap
= dev
->ap
;
2980 struct ata_host_set
*hs
= ap
->host_set
;
2981 unsigned long xfer_mask
;
2984 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2985 ap
->mwdma_mask
, ap
->udma_mask
);
2987 /* Apply cable rule here. Don't apply it early because when
2988 * we handle hot plug the cable type can itself change.
2990 if (ap
->cbl
== ATA_CBL_PATA40
)
2991 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2993 /* FIXME: Use port-wide xfermask for now */
2994 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2995 struct ata_device
*d
= &ap
->device
[i
];
2997 if (ata_dev_absent(d
))
3000 if (ata_dev_disabled(d
)) {
3001 /* to avoid violating device selection timing */
3002 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3003 UINT_MAX
, UINT_MAX
);
3007 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3008 d
->mwdma_mask
, d
->udma_mask
);
3009 xfer_mask
&= ata_id_xfermask(d
->id
);
3010 if (ata_dma_blacklisted(d
))
3011 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3014 if (ata_dma_blacklisted(dev
))
3015 ata_dev_printk(dev
, KERN_WARNING
,
3016 "device is on DMA blacklist, disabling DMA\n");
3018 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3019 if (hs
->simplex_claimed
)
3020 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3023 if (ap
->ops
->mode_filter
)
3024 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3026 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3027 &dev
->mwdma_mask
, &dev
->udma_mask
);
3031 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3032 * @dev: Device to which command will be sent
3034 * Issue SET FEATURES - XFER MODE command to device @dev
3038 * PCI/etc. bus probe sem.
3041 * 0 on success, AC_ERR_* mask otherwise.
3044 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3046 struct ata_taskfile tf
;
3047 unsigned int err_mask
;
3049 /* set up set-features taskfile */
3050 DPRINTK("set features - xfer mode\n");
3052 ata_tf_init(dev
, &tf
);
3053 tf
.command
= ATA_CMD_SET_FEATURES
;
3054 tf
.feature
= SETFEATURES_XFER
;
3055 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3056 tf
.protocol
= ATA_PROT_NODATA
;
3057 tf
.nsect
= dev
->xfer_mode
;
3059 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3061 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3066 * ata_dev_init_params - Issue INIT DEV PARAMS command
3067 * @dev: Device to which command will be sent
3068 * @heads: Number of heads
3069 * @sectors: Number of sectors
3072 * Kernel thread context (may sleep)
3075 * 0 on success, AC_ERR_* mask otherwise.
3077 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3078 u16 heads
, u16 sectors
)
3080 struct ata_taskfile tf
;
3081 unsigned int err_mask
;
3083 /* Number of sectors per track 1-255. Number of heads 1-16 */
3084 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3085 return AC_ERR_INVALID
;
3087 /* set up init dev params taskfile */
3088 DPRINTK("init dev params \n");
3090 ata_tf_init(dev
, &tf
);
3091 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3092 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3093 tf
.protocol
= ATA_PROT_NODATA
;
3095 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3097 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3099 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3104 * ata_sg_clean - Unmap DMA memory associated with command
3105 * @qc: Command containing DMA memory to be released
3107 * Unmap all mapped DMA memory associated with this command.
3110 * spin_lock_irqsave(host_set lock)
3113 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3115 struct ata_port
*ap
= qc
->ap
;
3116 struct scatterlist
*sg
= qc
->__sg
;
3117 int dir
= qc
->dma_dir
;
3118 void *pad_buf
= NULL
;
3120 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3121 WARN_ON(sg
== NULL
);
3123 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3124 WARN_ON(qc
->n_elem
> 1);
3126 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3128 /* if we padded the buffer out to 32-bit bound, and data
3129 * xfer direction is from-device, we must copy from the
3130 * pad buffer back into the supplied buffer
3132 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3133 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3135 if (qc
->flags
& ATA_QCFLAG_SG
) {
3137 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3138 /* restore last sg */
3139 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3141 struct scatterlist
*psg
= &qc
->pad_sgent
;
3142 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3143 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3144 kunmap_atomic(addr
, KM_IRQ0
);
3148 dma_unmap_single(ap
->dev
,
3149 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3152 sg
->length
+= qc
->pad_len
;
3154 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3155 pad_buf
, qc
->pad_len
);
3158 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3163 * ata_fill_sg - Fill PCI IDE PRD table
3164 * @qc: Metadata associated with taskfile to be transferred
3166 * Fill PCI IDE PRD (scatter-gather) table with segments
3167 * associated with the current disk command.
3170 * spin_lock_irqsave(host_set lock)
3173 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3175 struct ata_port
*ap
= qc
->ap
;
3176 struct scatterlist
*sg
;
3179 WARN_ON(qc
->__sg
== NULL
);
3180 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3183 ata_for_each_sg(sg
, qc
) {
3187 /* determine if physical DMA addr spans 64K boundary.
3188 * Note h/w doesn't support 64-bit, so we unconditionally
3189 * truncate dma_addr_t to u32.
3191 addr
= (u32
) sg_dma_address(sg
);
3192 sg_len
= sg_dma_len(sg
);
3195 offset
= addr
& 0xffff;
3197 if ((offset
+ sg_len
) > 0x10000)
3198 len
= 0x10000 - offset
;
3200 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3201 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3202 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3211 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3214 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3215 * @qc: Metadata associated with taskfile to check
3217 * Allow low-level driver to filter ATA PACKET commands, returning
3218 * a status indicating whether or not it is OK to use DMA for the
3219 * supplied PACKET command.
3222 * spin_lock_irqsave(host_set lock)
3224 * RETURNS: 0 when ATAPI DMA can be used
3227 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3229 struct ata_port
*ap
= qc
->ap
;
3230 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3232 if (ap
->ops
->check_atapi_dma
)
3233 rc
= ap
->ops
->check_atapi_dma(qc
);
3235 /* We don't support polling DMA.
3236 * Use PIO if the LLDD handles only interrupts in
3237 * the HSM_ST_LAST state and the ATAPI device
3238 * generates CDB interrupts.
3240 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3241 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3247 * ata_qc_prep - Prepare taskfile for submission
3248 * @qc: Metadata associated with taskfile to be prepared
3250 * Prepare ATA taskfile for submission.
3253 * spin_lock_irqsave(host_set lock)
3255 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3257 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3263 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3266 * ata_sg_init_one - Associate command with memory buffer
3267 * @qc: Command to be associated
3268 * @buf: Memory buffer
3269 * @buflen: Length of memory buffer, in bytes.
3271 * Initialize the data-related elements of queued_cmd @qc
3272 * to point to a single memory buffer, @buf of byte length @buflen.
3275 * spin_lock_irqsave(host_set lock)
3278 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3280 struct scatterlist
*sg
;
3282 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3284 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3285 qc
->__sg
= &qc
->sgent
;
3287 qc
->orig_n_elem
= 1;
3291 sg_init_one(sg
, buf
, buflen
);
3295 * ata_sg_init - Associate command with scatter-gather table.
3296 * @qc: Command to be associated
3297 * @sg: Scatter-gather table.
3298 * @n_elem: Number of elements in s/g table.
3300 * Initialize the data-related elements of queued_cmd @qc
3301 * to point to a scatter-gather table @sg, containing @n_elem
3305 * spin_lock_irqsave(host_set lock)
3308 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3309 unsigned int n_elem
)
3311 qc
->flags
|= ATA_QCFLAG_SG
;
3313 qc
->n_elem
= n_elem
;
3314 qc
->orig_n_elem
= n_elem
;
3318 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3319 * @qc: Command with memory buffer to be mapped.
3321 * DMA-map the memory buffer associated with queued_cmd @qc.
3324 * spin_lock_irqsave(host_set lock)
3327 * Zero on success, negative on error.
3330 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3332 struct ata_port
*ap
= qc
->ap
;
3333 int dir
= qc
->dma_dir
;
3334 struct scatterlist
*sg
= qc
->__sg
;
3335 dma_addr_t dma_address
;
3338 /* we must lengthen transfers to end on a 32-bit boundary */
3339 qc
->pad_len
= sg
->length
& 3;
3341 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3342 struct scatterlist
*psg
= &qc
->pad_sgent
;
3344 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3346 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3348 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3349 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3352 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3353 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3355 sg
->length
-= qc
->pad_len
;
3356 if (sg
->length
== 0)
3359 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3360 sg
->length
, qc
->pad_len
);
3368 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3370 if (dma_mapping_error(dma_address
)) {
3372 sg
->length
+= qc
->pad_len
;
3376 sg_dma_address(sg
) = dma_address
;
3377 sg_dma_len(sg
) = sg
->length
;
3380 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3381 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3387 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3388 * @qc: Command with scatter-gather table to be mapped.
3390 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3393 * spin_lock_irqsave(host_set lock)
3396 * Zero on success, negative on error.
3400 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3402 struct ata_port
*ap
= qc
->ap
;
3403 struct scatterlist
*sg
= qc
->__sg
;
3404 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3405 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3407 VPRINTK("ENTER, ata%u\n", ap
->id
);
3408 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3410 /* we must lengthen transfers to end on a 32-bit boundary */
3411 qc
->pad_len
= lsg
->length
& 3;
3413 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3414 struct scatterlist
*psg
= &qc
->pad_sgent
;
3415 unsigned int offset
;
3417 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3419 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3422 * psg->page/offset are used to copy to-be-written
3423 * data in this function or read data in ata_sg_clean.
3425 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3426 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3427 psg
->offset
= offset_in_page(offset
);
3429 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3430 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3431 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3432 kunmap_atomic(addr
, KM_IRQ0
);
3435 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3436 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3438 lsg
->length
-= qc
->pad_len
;
3439 if (lsg
->length
== 0)
3442 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3443 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3446 pre_n_elem
= qc
->n_elem
;
3447 if (trim_sg
&& pre_n_elem
)
3456 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3458 /* restore last sg */
3459 lsg
->length
+= qc
->pad_len
;
3463 DPRINTK("%d sg elements mapped\n", n_elem
);
3466 qc
->n_elem
= n_elem
;
3472 * swap_buf_le16 - swap halves of 16-bit words in place
3473 * @buf: Buffer to swap
3474 * @buf_words: Number of 16-bit words in buffer.
3476 * Swap halves of 16-bit words if needed to convert from
3477 * little-endian byte order to native cpu byte order, or
3481 * Inherited from caller.
3483 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3488 for (i
= 0; i
< buf_words
; i
++)
3489 buf
[i
] = le16_to_cpu(buf
[i
]);
3490 #endif /* __BIG_ENDIAN */
3494 * ata_mmio_data_xfer - Transfer data by MMIO
3495 * @ap: port to read/write
3497 * @buflen: buffer length
3498 * @write_data: read/write
3500 * Transfer data from/to the device data register by MMIO.
3503 * Inherited from caller.
3506 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3507 unsigned int buflen
, int write_data
)
3510 unsigned int words
= buflen
>> 1;
3511 u16
*buf16
= (u16
*) buf
;
3512 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3514 /* Transfer multiple of 2 bytes */
3516 for (i
= 0; i
< words
; i
++)
3517 writew(le16_to_cpu(buf16
[i
]), mmio
);
3519 for (i
= 0; i
< words
; i
++)
3520 buf16
[i
] = cpu_to_le16(readw(mmio
));
3523 /* Transfer trailing 1 byte, if any. */
3524 if (unlikely(buflen
& 0x01)) {
3525 u16 align_buf
[1] = { 0 };
3526 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3529 memcpy(align_buf
, trailing_buf
, 1);
3530 writew(le16_to_cpu(align_buf
[0]), mmio
);
3532 align_buf
[0] = cpu_to_le16(readw(mmio
));
3533 memcpy(trailing_buf
, align_buf
, 1);
3539 * ata_pio_data_xfer - Transfer data by PIO
3540 * @ap: port to read/write
3542 * @buflen: buffer length
3543 * @write_data: read/write
3545 * Transfer data from/to the device data register by PIO.
3548 * Inherited from caller.
3551 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3552 unsigned int buflen
, int write_data
)
3554 unsigned int words
= buflen
>> 1;
3556 /* Transfer multiple of 2 bytes */
3558 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3560 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3562 /* Transfer trailing 1 byte, if any. */
3563 if (unlikely(buflen
& 0x01)) {
3564 u16 align_buf
[1] = { 0 };
3565 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3568 memcpy(align_buf
, trailing_buf
, 1);
3569 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3571 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3572 memcpy(trailing_buf
, align_buf
, 1);
3578 * ata_data_xfer - Transfer data from/to the data register.
3579 * @ap: port to read/write
3581 * @buflen: buffer length
3582 * @do_write: read/write
3584 * Transfer data from/to the device data register.
3587 * Inherited from caller.
3590 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3591 unsigned int buflen
, int do_write
)
3593 /* Make the crap hardware pay the costs not the good stuff */
3594 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3595 unsigned long flags
;
3596 local_irq_save(flags
);
3597 if (ap
->flags
& ATA_FLAG_MMIO
)
3598 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3600 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3601 local_irq_restore(flags
);
3603 if (ap
->flags
& ATA_FLAG_MMIO
)
3604 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3606 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3611 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3612 * @qc: Command on going
3614 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3617 * Inherited from caller.
3620 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3622 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3623 struct scatterlist
*sg
= qc
->__sg
;
3624 struct ata_port
*ap
= qc
->ap
;
3626 unsigned int offset
;
3629 if (qc
->cursect
== (qc
->nsect
- 1))
3630 ap
->hsm_task_state
= HSM_ST_LAST
;
3632 page
= sg
[qc
->cursg
].page
;
3633 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3635 /* get the current page and offset */
3636 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3637 offset
%= PAGE_SIZE
;
3639 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3641 if (PageHighMem(page
)) {
3642 unsigned long flags
;
3644 local_irq_save(flags
);
3645 buf
= kmap_atomic(page
, KM_IRQ0
);
3647 /* do the actual data transfer */
3648 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3650 kunmap_atomic(buf
, KM_IRQ0
);
3651 local_irq_restore(flags
);
3653 buf
= page_address(page
);
3654 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3660 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3667 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3668 * @qc: Command on going
3670 * Transfer one or many ATA_SECT_SIZE of data from/to the
3671 * ATA device for the DRQ request.
3674 * Inherited from caller.
3677 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3679 if (is_multi_taskfile(&qc
->tf
)) {
3680 /* READ/WRITE MULTIPLE */
3683 WARN_ON(qc
->dev
->multi_count
== 0);
3685 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3693 * atapi_send_cdb - Write CDB bytes to hardware
3694 * @ap: Port to which ATAPI device is attached.
3695 * @qc: Taskfile currently active
3697 * When device has indicated its readiness to accept
3698 * a CDB, this function is called. Send the CDB.
3704 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3707 DPRINTK("send cdb\n");
3708 WARN_ON(qc
->dev
->cdb_len
< 12);
3710 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3711 ata_altstatus(ap
); /* flush */
3713 switch (qc
->tf
.protocol
) {
3714 case ATA_PROT_ATAPI
:
3715 ap
->hsm_task_state
= HSM_ST
;
3717 case ATA_PROT_ATAPI_NODATA
:
3718 ap
->hsm_task_state
= HSM_ST_LAST
;
3720 case ATA_PROT_ATAPI_DMA
:
3721 ap
->hsm_task_state
= HSM_ST_LAST
;
3722 /* initiate bmdma */
3723 ap
->ops
->bmdma_start(qc
);
3729 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3730 * @qc: Command on going
3731 * @bytes: number of bytes
3733 * Transfer Transfer data from/to the ATAPI device.
3736 * Inherited from caller.
3740 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3742 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3743 struct scatterlist
*sg
= qc
->__sg
;
3744 struct ata_port
*ap
= qc
->ap
;
3747 unsigned int offset
, count
;
3749 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3750 ap
->hsm_task_state
= HSM_ST_LAST
;
3753 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3755 * The end of qc->sg is reached and the device expects
3756 * more data to transfer. In order not to overrun qc->sg
3757 * and fulfill length specified in the byte count register,
3758 * - for read case, discard trailing data from the device
3759 * - for write case, padding zero data to the device
3761 u16 pad_buf
[1] = { 0 };
3762 unsigned int words
= bytes
>> 1;
3765 if (words
) /* warning if bytes > 1 */
3766 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3767 "%u bytes trailing data\n", bytes
);
3769 for (i
= 0; i
< words
; i
++)
3770 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3772 ap
->hsm_task_state
= HSM_ST_LAST
;
3776 sg
= &qc
->__sg
[qc
->cursg
];
3779 offset
= sg
->offset
+ qc
->cursg_ofs
;
3781 /* get the current page and offset */
3782 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3783 offset
%= PAGE_SIZE
;
3785 /* don't overrun current sg */
3786 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3788 /* don't cross page boundaries */
3789 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3791 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3793 if (PageHighMem(page
)) {
3794 unsigned long flags
;
3796 local_irq_save(flags
);
3797 buf
= kmap_atomic(page
, KM_IRQ0
);
3799 /* do the actual data transfer */
3800 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3802 kunmap_atomic(buf
, KM_IRQ0
);
3803 local_irq_restore(flags
);
3805 buf
= page_address(page
);
3806 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3810 qc
->curbytes
+= count
;
3811 qc
->cursg_ofs
+= count
;
3813 if (qc
->cursg_ofs
== sg
->length
) {
3823 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3824 * @qc: Command on going
3826 * Transfer Transfer data from/to the ATAPI device.
3829 * Inherited from caller.
3832 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3834 struct ata_port
*ap
= qc
->ap
;
3835 struct ata_device
*dev
= qc
->dev
;
3836 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3837 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3839 ap
->ops
->tf_read(ap
, &qc
->tf
);
3840 ireason
= qc
->tf
.nsect
;
3841 bc_lo
= qc
->tf
.lbam
;
3842 bc_hi
= qc
->tf
.lbah
;
3843 bytes
= (bc_hi
<< 8) | bc_lo
;
3845 /* shall be cleared to zero, indicating xfer of data */
3846 if (ireason
& (1 << 0))
3849 /* make sure transfer direction matches expected */
3850 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3851 if (do_write
!= i_write
)
3854 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3856 __atapi_pio_bytes(qc
, bytes
);
3861 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3862 qc
->err_mask
|= AC_ERR_HSM
;
3863 ap
->hsm_task_state
= HSM_ST_ERR
;
3867 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3868 * @ap: the target ata_port
3872 * 1 if ok in workqueue, 0 otherwise.
3875 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3877 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3880 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3881 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3882 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3885 if (is_atapi_taskfile(&qc
->tf
) &&
3886 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3894 * ata_hsm_qc_complete - finish a qc running on standard HSM
3895 * @qc: Command to complete
3896 * @in_wq: 1 if called from workqueue, 0 otherwise
3898 * Finish @qc which is running on standard HSM.
3901 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3902 * Otherwise, none on entry and grabs host lock.
3904 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3906 struct ata_port
*ap
= qc
->ap
;
3907 unsigned long flags
;
3909 if (ap
->ops
->error_handler
) {
3911 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3913 /* EH might have kicked in while host_set lock
3916 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3918 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3920 ata_qc_complete(qc
);
3922 ata_port_freeze(ap
);
3925 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3927 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3928 ata_qc_complete(qc
);
3930 ata_port_freeze(ap
);
3934 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3936 ata_qc_complete(qc
);
3937 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3939 ata_qc_complete(qc
);
3944 * ata_hsm_move - move the HSM to the next state.
3945 * @ap: the target ata_port
3947 * @status: current device status
3948 * @in_wq: 1 if called from workqueue, 0 otherwise
3951 * 1 when poll next status needed, 0 otherwise.
3954 static int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3955 u8 status
, int in_wq
)
3957 unsigned long flags
= 0;
3960 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3962 /* Make sure ata_qc_issue_prot() does not throw things
3963 * like DMA polling into the workqueue. Notice that
3964 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3966 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3969 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3970 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
3972 switch (ap
->hsm_task_state
) {
3974 /* Send first data block or PACKET CDB */
3976 /* If polling, we will stay in the work queue after
3977 * sending the data. Otherwise, interrupt handler
3978 * takes over after sending the data.
3980 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3982 /* check device status */
3983 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
3984 /* Wrong status. Let EH handle this */
3985 qc
->err_mask
|= AC_ERR_HSM
;
3986 ap
->hsm_task_state
= HSM_ST_ERR
;
3990 /* Device should not ask for data transfer (DRQ=1)
3991 * when it finds something wrong.
3992 * We ignore DRQ here and stop the HSM by
3993 * changing hsm_task_state to HSM_ST_ERR and
3994 * let the EH abort the command or reset the device.
3996 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
3997 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
3999 qc
->err_mask
|= AC_ERR_DEV
;
4000 ap
->hsm_task_state
= HSM_ST_ERR
;
4004 /* Send the CDB (atapi) or the first data block (ata pio out).
4005 * During the state transition, interrupt handler shouldn't
4006 * be invoked before the data transfer is complete and
4007 * hsm_task_state is changed. Hence, the following locking.
4010 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4012 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4013 /* PIO data out protocol.
4014 * send first data block.
4017 /* ata_pio_sectors() might change the state
4018 * to HSM_ST_LAST. so, the state is changed here
4019 * before ata_pio_sectors().
4021 ap
->hsm_task_state
= HSM_ST
;
4022 ata_pio_sectors(qc
);
4023 ata_altstatus(ap
); /* flush */
4026 atapi_send_cdb(ap
, qc
);
4029 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4031 /* if polling, ata_pio_task() handles the rest.
4032 * otherwise, interrupt handler takes over from here.
4037 /* complete command or read/write the data register */
4038 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4039 /* ATAPI PIO protocol */
4040 if ((status
& ATA_DRQ
) == 0) {
4041 /* no more data to transfer */
4042 ap
->hsm_task_state
= HSM_ST_LAST
;
4046 /* Device should not ask for data transfer (DRQ=1)
4047 * when it finds something wrong.
4048 * We ignore DRQ here and stop the HSM by
4049 * changing hsm_task_state to HSM_ST_ERR and
4050 * let the EH abort the command or reset the device.
4052 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4053 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4055 qc
->err_mask
|= AC_ERR_DEV
;
4056 ap
->hsm_task_state
= HSM_ST_ERR
;
4060 atapi_pio_bytes(qc
);
4062 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4063 /* bad ireason reported by device */
4067 /* ATA PIO protocol */
4068 if (unlikely((status
& ATA_DRQ
) == 0)) {
4069 /* handle BSY=0, DRQ=0 as error */
4070 qc
->err_mask
|= AC_ERR_HSM
;
4071 ap
->hsm_task_state
= HSM_ST_ERR
;
4075 /* For PIO reads, some devices may ask for
4076 * data transfer (DRQ=1) alone with ERR=1.
4077 * We respect DRQ here and transfer one
4078 * block of junk data before changing the
4079 * hsm_task_state to HSM_ST_ERR.
4081 * For PIO writes, ERR=1 DRQ=1 doesn't make
4082 * sense since the data block has been
4083 * transferred to the device.
4085 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4086 /* data might be corrputed */
4087 qc
->err_mask
|= AC_ERR_DEV
;
4089 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4090 ata_pio_sectors(qc
);
4092 status
= ata_wait_idle(ap
);
4095 /* ata_pio_sectors() might change the
4096 * state to HSM_ST_LAST. so, the state
4097 * is changed after ata_pio_sectors().
4099 ap
->hsm_task_state
= HSM_ST_ERR
;
4103 ata_pio_sectors(qc
);
4105 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4106 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4109 status
= ata_wait_idle(ap
);
4114 ata_altstatus(ap
); /* flush */
4119 if (unlikely(!ata_ok(status
))) {
4120 qc
->err_mask
|= __ac_err_mask(status
);
4121 ap
->hsm_task_state
= HSM_ST_ERR
;
4125 /* no more data to transfer */
4126 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4127 ap
->id
, qc
->dev
->devno
, status
);
4129 WARN_ON(qc
->err_mask
);
4131 ap
->hsm_task_state
= HSM_ST_IDLE
;
4133 /* complete taskfile transaction */
4134 ata_hsm_qc_complete(qc
, in_wq
);
4140 /* make sure qc->err_mask is available to
4141 * know what's wrong and recover
4143 WARN_ON(qc
->err_mask
== 0);
4145 ap
->hsm_task_state
= HSM_ST_IDLE
;
4147 /* complete taskfile transaction */
4148 ata_hsm_qc_complete(qc
, in_wq
);
4160 static void ata_pio_task(void *_data
)
4162 struct ata_queued_cmd
*qc
= _data
;
4163 struct ata_port
*ap
= qc
->ap
;
4168 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4171 * This is purely heuristic. This is a fast path.
4172 * Sometimes when we enter, BSY will be cleared in
4173 * a chk-status or two. If not, the drive is probably seeking
4174 * or something. Snooze for a couple msecs, then
4175 * chk-status again. If still busy, queue delayed work.
4177 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4178 if (status
& ATA_BUSY
) {
4180 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4181 if (status
& ATA_BUSY
) {
4182 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4188 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4190 /* another command or interrupt handler
4191 * may be running at this point.
4198 * ata_qc_new - Request an available ATA command, for queueing
4199 * @ap: Port associated with device @dev
4200 * @dev: Device from whom we request an available command structure
4206 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4208 struct ata_queued_cmd
*qc
= NULL
;
4211 /* no command while frozen */
4212 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4215 /* the last tag is reserved for internal command. */
4216 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4217 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4218 qc
= __ata_qc_from_tag(ap
, i
);
4229 * ata_qc_new_init - Request an available ATA command, and initialize it
4230 * @dev: Device from whom we request an available command structure
4236 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4238 struct ata_port
*ap
= dev
->ap
;
4239 struct ata_queued_cmd
*qc
;
4241 qc
= ata_qc_new(ap
);
4254 * ata_qc_free - free unused ata_queued_cmd
4255 * @qc: Command to complete
4257 * Designed to free unused ata_queued_cmd object
4258 * in case something prevents using it.
4261 * spin_lock_irqsave(host_set lock)
4263 void ata_qc_free(struct ata_queued_cmd
*qc
)
4265 struct ata_port
*ap
= qc
->ap
;
4268 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4272 if (likely(ata_tag_valid(tag
))) {
4273 qc
->tag
= ATA_TAG_POISON
;
4274 clear_bit(tag
, &ap
->qc_allocated
);
4278 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4280 struct ata_port
*ap
= qc
->ap
;
4282 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4283 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4285 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4288 /* command should be marked inactive atomically with qc completion */
4289 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4290 ap
->sactive
&= ~(1 << qc
->tag
);
4292 ap
->active_tag
= ATA_TAG_POISON
;
4294 /* atapi: mark qc as inactive to prevent the interrupt handler
4295 * from completing the command twice later, before the error handler
4296 * is called. (when rc != 0 and atapi request sense is needed)
4298 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4299 ap
->qc_active
&= ~(1 << qc
->tag
);
4301 /* call completion callback */
4302 qc
->complete_fn(qc
);
4306 * ata_qc_complete - Complete an active ATA command
4307 * @qc: Command to complete
4308 * @err_mask: ATA Status register contents
4310 * Indicate to the mid and upper layers that an ATA
4311 * command has completed, with either an ok or not-ok status.
4314 * spin_lock_irqsave(host_set lock)
4316 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4318 struct ata_port
*ap
= qc
->ap
;
4320 /* XXX: New EH and old EH use different mechanisms to
4321 * synchronize EH with regular execution path.
4323 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4324 * Normal execution path is responsible for not accessing a
4325 * failed qc. libata core enforces the rule by returning NULL
4326 * from ata_qc_from_tag() for failed qcs.
4328 * Old EH depends on ata_qc_complete() nullifying completion
4329 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4330 * not synchronize with interrupt handler. Only PIO task is
4333 if (ap
->ops
->error_handler
) {
4334 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4336 if (unlikely(qc
->err_mask
))
4337 qc
->flags
|= ATA_QCFLAG_FAILED
;
4339 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4340 if (!ata_tag_internal(qc
->tag
)) {
4341 /* always fill result TF for failed qc */
4342 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4343 ata_qc_schedule_eh(qc
);
4348 /* read result TF if requested */
4349 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4350 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4352 __ata_qc_complete(qc
);
4354 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4357 /* read result TF if failed or requested */
4358 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4359 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4361 __ata_qc_complete(qc
);
4366 * ata_qc_complete_multiple - Complete multiple qcs successfully
4367 * @ap: port in question
4368 * @qc_active: new qc_active mask
4369 * @finish_qc: LLDD callback invoked before completing a qc
4371 * Complete in-flight commands. This functions is meant to be
4372 * called from low-level driver's interrupt routine to complete
4373 * requests normally. ap->qc_active and @qc_active is compared
4374 * and commands are completed accordingly.
4377 * spin_lock_irqsave(host_set lock)
4380 * Number of completed commands on success, -errno otherwise.
4382 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4383 void (*finish_qc
)(struct ata_queued_cmd
*))
4389 done_mask
= ap
->qc_active
^ qc_active
;
4391 if (unlikely(done_mask
& qc_active
)) {
4392 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4393 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4397 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4398 struct ata_queued_cmd
*qc
;
4400 if (!(done_mask
& (1 << i
)))
4403 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4406 ata_qc_complete(qc
);
4414 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4416 struct ata_port
*ap
= qc
->ap
;
4418 switch (qc
->tf
.protocol
) {
4421 case ATA_PROT_ATAPI_DMA
:
4424 case ATA_PROT_ATAPI
:
4426 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4439 * ata_qc_issue - issue taskfile to device
4440 * @qc: command to issue to device
4442 * Prepare an ATA command to submission to device.
4443 * This includes mapping the data into a DMA-able
4444 * area, filling in the S/G table, and finally
4445 * writing the taskfile to hardware, starting the command.
4448 * spin_lock_irqsave(host_set lock)
4450 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4452 struct ata_port
*ap
= qc
->ap
;
4454 /* Make sure only one non-NCQ command is outstanding. The
4455 * check is skipped for old EH because it reuses active qc to
4456 * request ATAPI sense.
4458 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4460 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4461 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4462 ap
->sactive
|= 1 << qc
->tag
;
4464 WARN_ON(ap
->sactive
);
4465 ap
->active_tag
= qc
->tag
;
4468 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4469 ap
->qc_active
|= 1 << qc
->tag
;
4471 if (ata_should_dma_map(qc
)) {
4472 if (qc
->flags
& ATA_QCFLAG_SG
) {
4473 if (ata_sg_setup(qc
))
4475 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4476 if (ata_sg_setup_one(qc
))
4480 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4483 ap
->ops
->qc_prep(qc
);
4485 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4486 if (unlikely(qc
->err_mask
))
4491 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4492 qc
->err_mask
|= AC_ERR_SYSTEM
;
4494 ata_qc_complete(qc
);
4498 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4499 * @qc: command to issue to device
4501 * Using various libata functions and hooks, this function
4502 * starts an ATA command. ATA commands are grouped into
4503 * classes called "protocols", and issuing each type of protocol
4504 * is slightly different.
4506 * May be used as the qc_issue() entry in ata_port_operations.
4509 * spin_lock_irqsave(host_set lock)
4512 * Zero on success, AC_ERR_* mask on failure
4515 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4517 struct ata_port
*ap
= qc
->ap
;
4519 /* Use polling pio if the LLD doesn't handle
4520 * interrupt driven pio and atapi CDB interrupt.
4522 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4523 switch (qc
->tf
.protocol
) {
4525 case ATA_PROT_ATAPI
:
4526 case ATA_PROT_ATAPI_NODATA
:
4527 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4529 case ATA_PROT_ATAPI_DMA
:
4530 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4531 /* see ata_check_atapi_dma() */
4539 /* select the device */
4540 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4542 /* start the command */
4543 switch (qc
->tf
.protocol
) {
4544 case ATA_PROT_NODATA
:
4545 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4546 ata_qc_set_polling(qc
);
4548 ata_tf_to_host(ap
, &qc
->tf
);
4549 ap
->hsm_task_state
= HSM_ST_LAST
;
4551 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4552 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4557 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4559 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4560 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4561 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4562 ap
->hsm_task_state
= HSM_ST_LAST
;
4566 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4567 ata_qc_set_polling(qc
);
4569 ata_tf_to_host(ap
, &qc
->tf
);
4571 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4572 /* PIO data out protocol */
4573 ap
->hsm_task_state
= HSM_ST_FIRST
;
4574 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4576 /* always send first data block using
4577 * the ata_pio_task() codepath.
4580 /* PIO data in protocol */
4581 ap
->hsm_task_state
= HSM_ST
;
4583 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4584 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4586 /* if polling, ata_pio_task() handles the rest.
4587 * otherwise, interrupt handler takes over from here.
4593 case ATA_PROT_ATAPI
:
4594 case ATA_PROT_ATAPI_NODATA
:
4595 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4596 ata_qc_set_polling(qc
);
4598 ata_tf_to_host(ap
, &qc
->tf
);
4600 ap
->hsm_task_state
= HSM_ST_FIRST
;
4602 /* send cdb by polling if no cdb interrupt */
4603 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4604 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4605 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4608 case ATA_PROT_ATAPI_DMA
:
4609 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4611 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4612 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4613 ap
->hsm_task_state
= HSM_ST_FIRST
;
4615 /* send cdb by polling if no cdb interrupt */
4616 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4617 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4622 return AC_ERR_SYSTEM
;
4629 * ata_host_intr - Handle host interrupt for given (port, task)
4630 * @ap: Port on which interrupt arrived (possibly...)
4631 * @qc: Taskfile currently active in engine
4633 * Handle host interrupt for given queued command. Currently,
4634 * only DMA interrupts are handled. All other commands are
4635 * handled via polling with interrupts disabled (nIEN bit).
4638 * spin_lock_irqsave(host_set lock)
4641 * One if interrupt was handled, zero if not (shared irq).
4644 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4645 struct ata_queued_cmd
*qc
)
4647 u8 status
, host_stat
= 0;
4649 VPRINTK("ata%u: protocol %d task_state %d\n",
4650 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4652 /* Check whether we are expecting interrupt in this state */
4653 switch (ap
->hsm_task_state
) {
4655 /* Some pre-ATAPI-4 devices assert INTRQ
4656 * at this state when ready to receive CDB.
4659 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4660 * The flag was turned on only for atapi devices.
4661 * No need to check is_atapi_taskfile(&qc->tf) again.
4663 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4667 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4668 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4669 /* check status of DMA engine */
4670 host_stat
= ap
->ops
->bmdma_status(ap
);
4671 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4673 /* if it's not our irq... */
4674 if (!(host_stat
& ATA_DMA_INTR
))
4677 /* before we do anything else, clear DMA-Start bit */
4678 ap
->ops
->bmdma_stop(qc
);
4680 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4681 /* error when transfering data to/from memory */
4682 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4683 ap
->hsm_task_state
= HSM_ST_ERR
;
4693 /* check altstatus */
4694 status
= ata_altstatus(ap
);
4695 if (status
& ATA_BUSY
)
4698 /* check main status, clearing INTRQ */
4699 status
= ata_chk_status(ap
);
4700 if (unlikely(status
& ATA_BUSY
))
4703 /* ack bmdma irq events */
4704 ap
->ops
->irq_clear(ap
);
4706 ata_hsm_move(ap
, qc
, status
, 0);
4707 return 1; /* irq handled */
4710 ap
->stats
.idle_irq
++;
4713 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4714 ata_irq_ack(ap
, 0); /* debug trap */
4715 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4719 return 0; /* irq not handled */
4723 * ata_interrupt - Default ATA host interrupt handler
4724 * @irq: irq line (unused)
4725 * @dev_instance: pointer to our ata_host_set information structure
4728 * Default interrupt handler for PCI IDE devices. Calls
4729 * ata_host_intr() for each port that is not disabled.
4732 * Obtains host_set lock during operation.
4735 * IRQ_NONE or IRQ_HANDLED.
4738 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4740 struct ata_host_set
*host_set
= dev_instance
;
4742 unsigned int handled
= 0;
4743 unsigned long flags
;
4745 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4746 spin_lock_irqsave(&host_set
->lock
, flags
);
4748 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4749 struct ata_port
*ap
;
4751 ap
= host_set
->ports
[i
];
4753 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4754 struct ata_queued_cmd
*qc
;
4756 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4757 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4758 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4759 handled
|= ata_host_intr(ap
, qc
);
4763 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4765 return IRQ_RETVAL(handled
);
4769 * sata_scr_valid - test whether SCRs are accessible
4770 * @ap: ATA port to test SCR accessibility for
4772 * Test whether SCRs are accessible for @ap.
4778 * 1 if SCRs are accessible, 0 otherwise.
4780 int sata_scr_valid(struct ata_port
*ap
)
4782 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4786 * sata_scr_read - read SCR register of the specified port
4787 * @ap: ATA port to read SCR for
4789 * @val: Place to store read value
4791 * Read SCR register @reg of @ap into *@val. This function is
4792 * guaranteed to succeed if the cable type of the port is SATA
4793 * and the port implements ->scr_read.
4799 * 0 on success, negative errno on failure.
4801 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4803 if (sata_scr_valid(ap
)) {
4804 *val
= ap
->ops
->scr_read(ap
, reg
);
4811 * sata_scr_write - write SCR register of the specified port
4812 * @ap: ATA port to write SCR for
4813 * @reg: SCR to write
4814 * @val: value to write
4816 * Write @val to SCR register @reg of @ap. This function is
4817 * guaranteed to succeed if the cable type of the port is SATA
4818 * and the port implements ->scr_read.
4824 * 0 on success, negative errno on failure.
4826 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4828 if (sata_scr_valid(ap
)) {
4829 ap
->ops
->scr_write(ap
, reg
, val
);
4836 * sata_scr_write_flush - write SCR register of the specified port and flush
4837 * @ap: ATA port to write SCR for
4838 * @reg: SCR to write
4839 * @val: value to write
4841 * This function is identical to sata_scr_write() except that this
4842 * function performs flush after writing to the register.
4848 * 0 on success, negative errno on failure.
4850 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4852 if (sata_scr_valid(ap
)) {
4853 ap
->ops
->scr_write(ap
, reg
, val
);
4854 ap
->ops
->scr_read(ap
, reg
);
4861 * ata_port_online - test whether the given port is online
4862 * @ap: ATA port to test
4864 * Test whether @ap is online. Note that this function returns 0
4865 * if online status of @ap cannot be obtained, so
4866 * ata_port_online(ap) != !ata_port_offline(ap).
4872 * 1 if the port online status is available and online.
4874 int ata_port_online(struct ata_port
*ap
)
4878 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4884 * ata_port_offline - test whether the given port is offline
4885 * @ap: ATA port to test
4887 * Test whether @ap is offline. Note that this function returns
4888 * 0 if offline status of @ap cannot be obtained, so
4889 * ata_port_online(ap) != !ata_port_offline(ap).
4895 * 1 if the port offline status is available and offline.
4897 int ata_port_offline(struct ata_port
*ap
)
4901 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4907 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4908 * without filling any other registers
4910 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4912 struct ata_taskfile tf
;
4915 ata_tf_init(dev
, &tf
);
4918 tf
.flags
|= ATA_TFLAG_DEVICE
;
4919 tf
.protocol
= ATA_PROT_NODATA
;
4921 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4923 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4929 static int ata_flush_cache(struct ata_device
*dev
)
4933 if (!ata_try_flush_cache(dev
))
4936 if (ata_id_has_flush_ext(dev
->id
))
4937 cmd
= ATA_CMD_FLUSH_EXT
;
4939 cmd
= ATA_CMD_FLUSH
;
4941 return ata_do_simple_cmd(dev
, cmd
);
4944 static int ata_standby_drive(struct ata_device
*dev
)
4946 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4949 static int ata_start_drive(struct ata_device
*dev
)
4951 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4955 * ata_device_resume - wakeup a previously suspended devices
4956 * @dev: the device to resume
4958 * Kick the drive back into action, by sending it an idle immediate
4959 * command and making sure its transfer mode matches between drive
4963 int ata_device_resume(struct ata_device
*dev
)
4965 struct ata_port
*ap
= dev
->ap
;
4967 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4968 struct ata_device
*failed_dev
;
4969 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4970 while (ata_set_mode(ap
, &failed_dev
))
4971 ata_dev_disable(failed_dev
);
4973 if (!ata_dev_enabled(dev
))
4975 if (dev
->class == ATA_DEV_ATA
)
4976 ata_start_drive(dev
);
4982 * ata_device_suspend - prepare a device for suspend
4983 * @dev: the device to suspend
4985 * Flush the cache on the drive, if appropriate, then issue a
4986 * standbynow command.
4988 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
4990 struct ata_port
*ap
= dev
->ap
;
4992 if (!ata_dev_enabled(dev
))
4994 if (dev
->class == ATA_DEV_ATA
)
4995 ata_flush_cache(dev
);
4997 if (state
.event
!= PM_EVENT_FREEZE
)
4998 ata_standby_drive(dev
);
4999 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5004 * ata_port_start - Set port up for dma.
5005 * @ap: Port to initialize
5007 * Called just after data structures for each port are
5008 * initialized. Allocates space for PRD table.
5010 * May be used as the port_start() entry in ata_port_operations.
5013 * Inherited from caller.
5016 int ata_port_start (struct ata_port
*ap
)
5018 struct device
*dev
= ap
->dev
;
5021 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5025 rc
= ata_pad_alloc(ap
, dev
);
5027 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5031 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5038 * ata_port_stop - Undo ata_port_start()
5039 * @ap: Port to shut down
5041 * Frees the PRD table.
5043 * May be used as the port_stop() entry in ata_port_operations.
5046 * Inherited from caller.
5049 void ata_port_stop (struct ata_port
*ap
)
5051 struct device
*dev
= ap
->dev
;
5053 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5054 ata_pad_free(ap
, dev
);
5057 void ata_host_stop (struct ata_host_set
*host_set
)
5059 if (host_set
->mmio_base
)
5060 iounmap(host_set
->mmio_base
);
5065 * ata_host_remove - Unregister SCSI host structure with upper layers
5066 * @ap: Port to unregister
5067 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5070 * Inherited from caller.
5073 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5075 struct Scsi_Host
*sh
= ap
->host
;
5080 scsi_remove_host(sh
);
5082 ap
->ops
->port_stop(ap
);
5086 * ata_host_init - Initialize an ata_port structure
5087 * @ap: Structure to initialize
5088 * @host: associated SCSI mid-layer structure
5089 * @host_set: Collection of hosts to which @ap belongs
5090 * @ent: Probe information provided by low-level driver
5091 * @port_no: Port number associated with this ata_port
5093 * Initialize a new ata_port structure, and its associated
5097 * Inherited from caller.
5100 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5101 struct ata_host_set
*host_set
,
5102 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5108 host
->max_channel
= 1;
5109 host
->unique_id
= ata_unique_id
++;
5110 host
->max_cmd_len
= 12;
5112 ap
->flags
= ATA_FLAG_DISABLED
;
5113 ap
->id
= host
->unique_id
;
5115 ap
->ctl
= ATA_DEVCTL_OBS
;
5116 ap
->host_set
= host_set
;
5118 ap
->port_no
= port_no
;
5120 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5121 ap
->pio_mask
= ent
->pio_mask
;
5122 ap
->mwdma_mask
= ent
->mwdma_mask
;
5123 ap
->udma_mask
= ent
->udma_mask
;
5124 ap
->flags
|= ent
->host_flags
;
5125 ap
->ops
= ent
->port_ops
;
5126 ap
->sata_spd_limit
= UINT_MAX
;
5127 ap
->active_tag
= ATA_TAG_POISON
;
5128 ap
->last_ctl
= 0xFF;
5130 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5131 INIT_LIST_HEAD(&ap
->eh_done_q
);
5133 /* set cable type */
5134 ap
->cbl
= ATA_CBL_NONE
;
5135 if (ap
->flags
& ATA_FLAG_SATA
)
5136 ap
->cbl
= ATA_CBL_SATA
;
5138 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5139 struct ata_device
*dev
= &ap
->device
[i
];
5142 dev
->pio_mask
= UINT_MAX
;
5143 dev
->mwdma_mask
= UINT_MAX
;
5144 dev
->udma_mask
= UINT_MAX
;
5148 ap
->stats
.unhandled_irq
= 1;
5149 ap
->stats
.idle_irq
= 1;
5152 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5156 * ata_host_add - Attach low-level ATA driver to system
5157 * @ent: Information provided by low-level driver
5158 * @host_set: Collections of ports to which we add
5159 * @port_no: Port number associated with this host
5161 * Attach low-level ATA driver to system.
5164 * PCI/etc. bus probe sem.
5167 * New ata_port on success, for NULL on error.
5170 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5171 struct ata_host_set
*host_set
,
5172 unsigned int port_no
)
5174 struct Scsi_Host
*host
;
5175 struct ata_port
*ap
;
5180 if (!ent
->port_ops
->probe_reset
&&
5181 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5182 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5187 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5191 host
->transportt
= &ata_scsi_transport_template
;
5193 ap
= ata_shost_to_port(host
);
5195 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5197 rc
= ap
->ops
->port_start(ap
);
5204 scsi_host_put(host
);
5209 * ata_device_add - Register hardware device with ATA and SCSI layers
5210 * @ent: Probe information describing hardware device to be registered
5212 * This function processes the information provided in the probe
5213 * information struct @ent, allocates the necessary ATA and SCSI
5214 * host information structures, initializes them, and registers
5215 * everything with requisite kernel subsystems.
5217 * This function requests irqs, probes the ATA bus, and probes
5221 * PCI/etc. bus probe sem.
5224 * Number of ports registered. Zero on error (no ports registered).
5227 int ata_device_add(const struct ata_probe_ent
*ent
)
5229 unsigned int count
= 0, i
;
5230 struct device
*dev
= ent
->dev
;
5231 struct ata_host_set
*host_set
;
5234 /* alloc a container for our list of ATA ports (buses) */
5235 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5236 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5239 spin_lock_init(&host_set
->lock
);
5241 host_set
->dev
= dev
;
5242 host_set
->n_ports
= ent
->n_ports
;
5243 host_set
->irq
= ent
->irq
;
5244 host_set
->mmio_base
= ent
->mmio_base
;
5245 host_set
->private_data
= ent
->private_data
;
5246 host_set
->ops
= ent
->port_ops
;
5247 host_set
->flags
= ent
->host_set_flags
;
5249 /* register each port bound to this device */
5250 for (i
= 0; i
< ent
->n_ports
; i
++) {
5251 struct ata_port
*ap
;
5252 unsigned long xfer_mode_mask
;
5254 ap
= ata_host_add(ent
, host_set
, i
);
5258 host_set
->ports
[i
] = ap
;
5259 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5260 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5261 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5263 /* print per-port info to dmesg */
5264 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5265 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5266 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5267 ata_mode_string(xfer_mode_mask
),
5268 ap
->ioaddr
.cmd_addr
,
5269 ap
->ioaddr
.ctl_addr
,
5270 ap
->ioaddr
.bmdma_addr
,
5274 host_set
->ops
->irq_clear(ap
);
5275 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5282 /* obtain irq, that is shared between channels */
5283 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5284 DRV_NAME
, host_set
))
5287 /* perform each probe synchronously */
5288 DPRINTK("probe begin\n");
5289 for (i
= 0; i
< count
; i
++) {
5290 struct ata_port
*ap
;
5293 ap
= host_set
->ports
[i
];
5295 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5296 rc
= ata_bus_probe(ap
);
5297 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5300 /* FIXME: do something useful here?
5301 * Current libata behavior will
5302 * tear down everything when
5303 * the module is removed
5304 * or the h/w is unplugged.
5308 rc
= scsi_add_host(ap
->host
, dev
);
5310 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5311 /* FIXME: do something useful here */
5312 /* FIXME: handle unconditional calls to
5313 * scsi_scan_host and ata_host_remove, below,
5319 /* probes are done, now scan each port's disk(s) */
5320 DPRINTK("host probe begin\n");
5321 for (i
= 0; i
< count
; i
++) {
5322 struct ata_port
*ap
= host_set
->ports
[i
];
5324 ata_scsi_scan_host(ap
);
5327 dev_set_drvdata(dev
, host_set
);
5329 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5330 return ent
->n_ports
; /* success */
5333 for (i
= 0; i
< count
; i
++) {
5334 ata_host_remove(host_set
->ports
[i
], 1);
5335 scsi_host_put(host_set
->ports
[i
]->host
);
5339 VPRINTK("EXIT, returning 0\n");
5344 * ata_host_set_remove - PCI layer callback for device removal
5345 * @host_set: ATA host set that was removed
5347 * Unregister all objects associated with this host set. Free those
5351 * Inherited from calling layer (may sleep).
5354 void ata_host_set_remove(struct ata_host_set
*host_set
)
5356 struct ata_port
*ap
;
5359 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5360 ap
= host_set
->ports
[i
];
5361 scsi_remove_host(ap
->host
);
5364 free_irq(host_set
->irq
, host_set
);
5366 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5367 ap
= host_set
->ports
[i
];
5369 ata_scsi_release(ap
->host
);
5371 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5372 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5374 if (ioaddr
->cmd_addr
== 0x1f0)
5375 release_region(0x1f0, 8);
5376 else if (ioaddr
->cmd_addr
== 0x170)
5377 release_region(0x170, 8);
5380 scsi_host_put(ap
->host
);
5383 if (host_set
->ops
->host_stop
)
5384 host_set
->ops
->host_stop(host_set
);
5390 * ata_scsi_release - SCSI layer callback hook for host unload
5391 * @host: libata host to be unloaded
5393 * Performs all duties necessary to shut down a libata port...
5394 * Kill port kthread, disable port, and release resources.
5397 * Inherited from SCSI layer.
5403 int ata_scsi_release(struct Scsi_Host
*host
)
5405 struct ata_port
*ap
= ata_shost_to_port(host
);
5409 ap
->ops
->port_disable(ap
);
5410 ata_host_remove(ap
, 0);
5417 * ata_std_ports - initialize ioaddr with standard port offsets.
5418 * @ioaddr: IO address structure to be initialized
5420 * Utility function which initializes data_addr, error_addr,
5421 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5422 * device_addr, status_addr, and command_addr to standard offsets
5423 * relative to cmd_addr.
5425 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5428 void ata_std_ports(struct ata_ioports
*ioaddr
)
5430 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5431 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5432 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5433 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5434 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5435 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5436 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5437 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5438 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5439 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5445 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5447 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5449 pci_iounmap(pdev
, host_set
->mmio_base
);
5453 * ata_pci_remove_one - PCI layer callback for device removal
5454 * @pdev: PCI device that was removed
5456 * PCI layer indicates to libata via this hook that
5457 * hot-unplug or module unload event has occurred.
5458 * Handle this by unregistering all objects associated
5459 * with this PCI device. Free those objects. Then finally
5460 * release PCI resources and disable device.
5463 * Inherited from PCI layer (may sleep).
5466 void ata_pci_remove_one (struct pci_dev
*pdev
)
5468 struct device
*dev
= pci_dev_to_dev(pdev
);
5469 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5471 ata_host_set_remove(host_set
);
5472 pci_release_regions(pdev
);
5473 pci_disable_device(pdev
);
5474 dev_set_drvdata(dev
, NULL
);
5477 /* move to PCI subsystem */
5478 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5480 unsigned long tmp
= 0;
5482 switch (bits
->width
) {
5485 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5491 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5497 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5508 return (tmp
== bits
->val
) ? 1 : 0;
5511 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5513 pci_save_state(pdev
);
5514 pci_disable_device(pdev
);
5515 pci_set_power_state(pdev
, PCI_D3hot
);
5519 int ata_pci_device_resume(struct pci_dev
*pdev
)
5521 pci_set_power_state(pdev
, PCI_D0
);
5522 pci_restore_state(pdev
);
5523 pci_enable_device(pdev
);
5524 pci_set_master(pdev
);
5527 #endif /* CONFIG_PCI */
5530 static int __init
ata_init(void)
5532 ata_wq
= create_workqueue("ata");
5536 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5540 static void __exit
ata_exit(void)
5542 destroy_workqueue(ata_wq
);
5545 module_init(ata_init
);
5546 module_exit(ata_exit
);
5548 static unsigned long ratelimit_time
;
5549 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5551 int ata_ratelimit(void)
5554 unsigned long flags
;
5556 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5558 if (time_after(jiffies
, ratelimit_time
)) {
5560 ratelimit_time
= jiffies
+ (HZ
/5);
5564 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5570 * ata_wait_register - wait until register value changes
5571 * @reg: IO-mapped register
5572 * @mask: Mask to apply to read register value
5573 * @val: Wait condition
5574 * @interval_msec: polling interval in milliseconds
5575 * @timeout_msec: timeout in milliseconds
5577 * Waiting for some bits of register to change is a common
5578 * operation for ATA controllers. This function reads 32bit LE
5579 * IO-mapped register @reg and tests for the following condition.
5581 * (*@reg & mask) != val
5583 * If the condition is met, it returns; otherwise, the process is
5584 * repeated after @interval_msec until timeout.
5587 * Kernel thread context (may sleep)
5590 * The final register value.
5592 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5593 unsigned long interval_msec
,
5594 unsigned long timeout_msec
)
5596 unsigned long timeout
;
5599 tmp
= ioread32(reg
);
5601 /* Calculate timeout _after_ the first read to make sure
5602 * preceding writes reach the controller before starting to
5603 * eat away the timeout.
5605 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5607 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5608 msleep(interval_msec
);
5609 tmp
= ioread32(reg
);
5616 * libata is essentially a library of internal helper functions for
5617 * low-level ATA host controller drivers. As such, the API/ABI is
5618 * likely to change as new drivers are added and updated.
5619 * Do not depend on ABI/API stability.
5622 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5623 EXPORT_SYMBOL_GPL(ata_std_ports
);
5624 EXPORT_SYMBOL_GPL(ata_device_add
);
5625 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5626 EXPORT_SYMBOL_GPL(ata_sg_init
);
5627 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5628 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5629 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5630 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5631 EXPORT_SYMBOL_GPL(ata_tf_load
);
5632 EXPORT_SYMBOL_GPL(ata_tf_read
);
5633 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5634 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5635 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5636 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5637 EXPORT_SYMBOL_GPL(ata_check_status
);
5638 EXPORT_SYMBOL_GPL(ata_altstatus
);
5639 EXPORT_SYMBOL_GPL(ata_exec_command
);
5640 EXPORT_SYMBOL_GPL(ata_port_start
);
5641 EXPORT_SYMBOL_GPL(ata_port_stop
);
5642 EXPORT_SYMBOL_GPL(ata_host_stop
);
5643 EXPORT_SYMBOL_GPL(ata_interrupt
);
5644 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5645 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5646 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5647 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5648 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5649 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5650 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5651 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5652 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5653 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5654 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5655 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5656 EXPORT_SYMBOL_GPL(ata_port_probe
);
5657 EXPORT_SYMBOL_GPL(sata_set_spd
);
5658 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5659 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5660 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5661 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5662 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5663 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5664 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5665 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5666 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5667 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5668 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5669 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5670 EXPORT_SYMBOL_GPL(ata_port_disable
);
5671 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5672 EXPORT_SYMBOL_GPL(ata_wait_register
);
5673 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5674 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5675 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5676 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5677 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5678 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5679 EXPORT_SYMBOL_GPL(ata_host_intr
);
5680 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5681 EXPORT_SYMBOL_GPL(sata_scr_read
);
5682 EXPORT_SYMBOL_GPL(sata_scr_write
);
5683 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5684 EXPORT_SYMBOL_GPL(ata_port_online
);
5685 EXPORT_SYMBOL_GPL(ata_port_offline
);
5686 EXPORT_SYMBOL_GPL(ata_id_string
);
5687 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5688 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5690 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5691 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5692 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5695 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5696 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5697 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5698 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5699 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5700 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5701 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5702 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5703 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5704 #endif /* CONFIG_PCI */
5706 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5707 EXPORT_SYMBOL_GPL(ata_device_resume
);
5708 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5709 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5711 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5712 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5713 EXPORT_SYMBOL_GPL(ata_port_abort
);
5714 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5715 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5716 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5717 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5718 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5719 EXPORT_SYMBOL_GPL(ata_do_eh
);