2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
,
68 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
);
69 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
70 struct ata_device
*dev
);
71 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
73 static unsigned int ata_unique_id
= 1;
74 static struct workqueue_struct
*ata_wq
;
76 int atapi_enabled
= 1;
77 module_param(atapi_enabled
, int, 0444);
78 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (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 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
414 if (ata_dev_enabled(dev
)) {
415 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
422 * ata_pio_devchk - PATA device presence detection
423 * @ap: ATA channel to examine
424 * @device: Device to examine (starting at zero)
426 * This technique was originally described in
427 * Hale Landis's ATADRVR (www.ata-atapi.com), and
428 * later found its way into the ATA/ATAPI spec.
430 * Write a pattern to the ATA shadow registers,
431 * and if a device is present, it will respond by
432 * correctly storing and echoing back the
433 * ATA shadow register contents.
439 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
442 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
445 ap
->ops
->dev_select(ap
, device
);
447 outb(0x55, ioaddr
->nsect_addr
);
448 outb(0xaa, ioaddr
->lbal_addr
);
450 outb(0xaa, ioaddr
->nsect_addr
);
451 outb(0x55, ioaddr
->lbal_addr
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 nsect
= inb(ioaddr
->nsect_addr
);
457 lbal
= inb(ioaddr
->lbal_addr
);
459 if ((nsect
== 0x55) && (lbal
== 0xaa))
460 return 1; /* we found a device */
462 return 0; /* nothing found */
466 * ata_mmio_devchk - PATA device presence detection
467 * @ap: ATA channel to examine
468 * @device: Device to examine (starting at zero)
470 * This technique was originally described in
471 * Hale Landis's ATADRVR (www.ata-atapi.com), and
472 * later found its way into the ATA/ATAPI spec.
474 * Write a pattern to the ATA shadow registers,
475 * and if a device is present, it will respond by
476 * correctly storing and echoing back the
477 * ATA shadow register contents.
483 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
486 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
489 ap
->ops
->dev_select(ap
, device
);
491 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
492 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
494 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
495 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
501 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
503 if ((nsect
== 0x55) && (lbal
== 0xaa))
504 return 1; /* we found a device */
506 return 0; /* nothing found */
510 * ata_devchk - PATA device presence detection
511 * @ap: ATA channel to examine
512 * @device: Device to examine (starting at zero)
514 * Dispatch ATA device presence detection, depending
515 * on whether we are using PIO or MMIO to talk to the
516 * ATA shadow registers.
522 static unsigned int ata_devchk(struct ata_port
*ap
,
525 if (ap
->flags
& ATA_FLAG_MMIO
)
526 return ata_mmio_devchk(ap
, device
);
527 return ata_pio_devchk(ap
, device
);
531 * ata_dev_classify - determine device type based on ATA-spec signature
532 * @tf: ATA taskfile register set for device to be identified
534 * Determine from taskfile register contents whether a device is
535 * ATA or ATAPI, as per "Signature and persistence" section
536 * of ATA/PI spec (volume 1, sect 5.14).
542 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
543 * the event of failure.
546 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
548 /* Apple's open source Darwin code hints that some devices only
549 * put a proper signature into the LBA mid/high registers,
550 * So, we only check those. It's sufficient for uniqueness.
553 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
554 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
555 DPRINTK("found ATA device by sig\n");
559 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
560 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
561 DPRINTK("found ATAPI device by sig\n");
562 return ATA_DEV_ATAPI
;
565 DPRINTK("unknown device\n");
566 return ATA_DEV_UNKNOWN
;
570 * ata_dev_try_classify - Parse returned ATA device signature
571 * @ap: ATA channel to examine
572 * @device: Device to examine (starting at zero)
573 * @r_err: Value of error register on completion
575 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
576 * an ATA/ATAPI-defined set of values is placed in the ATA
577 * shadow registers, indicating the results of device detection
580 * Select the ATA device, and read the values from the ATA shadow
581 * registers. Then parse according to the Error register value,
582 * and the spec-defined values examined by ata_dev_classify().
588 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
592 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
594 struct ata_taskfile tf
;
598 ap
->ops
->dev_select(ap
, device
);
600 memset(&tf
, 0, sizeof(tf
));
602 ap
->ops
->tf_read(ap
, &tf
);
607 /* see if device passed diags */
610 else if ((device
== 0) && (err
== 0x81))
615 /* determine if device is ATA or ATAPI */
616 class = ata_dev_classify(&tf
);
618 if (class == ATA_DEV_UNKNOWN
)
620 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
626 * ata_id_string - Convert IDENTIFY DEVICE page into string
627 * @id: IDENTIFY DEVICE results we will examine
628 * @s: string into which data is output
629 * @ofs: offset into identify device page
630 * @len: length of string to return. must be an even number.
632 * The strings in the IDENTIFY DEVICE page are broken up into
633 * 16-bit chunks. Run through the string, and output each
634 * 8-bit chunk linearly, regardless of platform.
640 void ata_id_string(const u16
*id
, unsigned char *s
,
641 unsigned int ofs
, unsigned int len
)
660 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
661 * @id: IDENTIFY DEVICE results we will examine
662 * @s: string into which data is output
663 * @ofs: offset into identify device page
664 * @len: length of string to return. must be an odd number.
666 * This function is identical to ata_id_string except that it
667 * trims trailing spaces and terminates the resulting string with
668 * null. @len must be actual maximum length (even number) + 1.
673 void ata_id_c_string(const u16
*id
, unsigned char *s
,
674 unsigned int ofs
, unsigned int len
)
680 ata_id_string(id
, s
, ofs
, len
- 1);
682 p
= s
+ strnlen(s
, len
- 1);
683 while (p
> s
&& p
[-1] == ' ')
688 static u64
ata_id_n_sectors(const u16
*id
)
690 if (ata_id_has_lba(id
)) {
691 if (ata_id_has_lba48(id
))
692 return ata_id_u64(id
, 100);
694 return ata_id_u32(id
, 60);
696 if (ata_id_current_chs_valid(id
))
697 return ata_id_u32(id
, 57);
699 return id
[1] * id
[3] * id
[6];
704 * ata_noop_dev_select - Select device 0/1 on ATA bus
705 * @ap: ATA channel to manipulate
706 * @device: ATA device (numbered from zero) to select
708 * This function performs no actual function.
710 * May be used as the dev_select() entry in ata_port_operations.
715 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
721 * ata_std_dev_select - Select device 0/1 on ATA bus
722 * @ap: ATA channel to manipulate
723 * @device: ATA device (numbered from zero) to select
725 * Use the method defined in the ATA specification to
726 * make either device 0, or device 1, active on the
727 * ATA channel. Works with both PIO and MMIO.
729 * May be used as the dev_select() entry in ata_port_operations.
735 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
740 tmp
= ATA_DEVICE_OBS
;
742 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
744 if (ap
->flags
& ATA_FLAG_MMIO
) {
745 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
747 outb(tmp
, ap
->ioaddr
.device_addr
);
749 ata_pause(ap
); /* needed; also flushes, for mmio */
753 * ata_dev_select - Select device 0/1 on ATA bus
754 * @ap: ATA channel to manipulate
755 * @device: ATA device (numbered from zero) to select
756 * @wait: non-zero to wait for Status register BSY bit to clear
757 * @can_sleep: non-zero if context allows sleeping
759 * Use the method defined in the ATA specification to
760 * make either device 0, or device 1, active on the
763 * This is a high-level version of ata_std_dev_select(),
764 * which additionally provides the services of inserting
765 * the proper pauses and status polling, where needed.
771 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
772 unsigned int wait
, unsigned int can_sleep
)
774 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
775 ap
->id
, device
, wait
);
780 ap
->ops
->dev_select(ap
, device
);
783 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
790 * ata_dump_id - IDENTIFY DEVICE info debugging output
791 * @id: IDENTIFY DEVICE page to dump
793 * Dump selected 16-bit words from the given IDENTIFY DEVICE
800 static inline void ata_dump_id(const u16
*id
)
802 DPRINTK("49==0x%04x "
812 DPRINTK("80==0x%04x "
822 DPRINTK("88==0x%04x "
829 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
830 * @id: IDENTIFY data to compute xfer mask from
832 * Compute the xfermask for this device. This is not as trivial
833 * as it seems if we must consider early devices correctly.
835 * FIXME: pre IDE drive timing (do we care ?).
843 static unsigned int ata_id_xfermask(const u16
*id
)
845 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
847 /* Usual case. Word 53 indicates word 64 is valid */
848 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
849 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
853 /* If word 64 isn't valid then Word 51 high byte holds
854 * the PIO timing number for the maximum. Turn it into
857 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
859 /* But wait.. there's more. Design your standards by
860 * committee and you too can get a free iordy field to
861 * process. However its the speeds not the modes that
862 * are supported... Note drivers using the timing API
863 * will get this right anyway
867 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
870 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
871 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
873 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
877 * ata_port_queue_task - Queue port_task
878 * @ap: The ata_port to queue port_task for
880 * Schedule @fn(@data) for execution after @delay jiffies using
881 * port_task. There is one port_task per port and it's the
882 * user(low level driver)'s responsibility to make sure that only
883 * one task is active at any given time.
885 * libata core layer takes care of synchronization between
886 * port_task and EH. ata_port_queue_task() may be ignored for EH
890 * Inherited from caller.
892 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
897 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
900 PREPARE_WORK(&ap
->port_task
, fn
, data
);
903 rc
= queue_work(ata_wq
, &ap
->port_task
);
905 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
907 /* rc == 0 means that another user is using port task */
912 * ata_port_flush_task - Flush port_task
913 * @ap: The ata_port to flush port_task for
915 * After this function completes, port_task is guranteed not to
916 * be running or scheduled.
919 * Kernel thread context (may sleep)
921 void ata_port_flush_task(struct ata_port
*ap
)
927 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
928 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
929 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
931 DPRINTK("flush #1\n");
932 flush_workqueue(ata_wq
);
935 * At this point, if a task is running, it's guaranteed to see
936 * the FLUSH flag; thus, it will never queue pio tasks again.
939 if (!cancel_delayed_work(&ap
->port_task
)) {
940 DPRINTK("flush #2\n");
941 flush_workqueue(ata_wq
);
944 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
945 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
946 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
951 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
953 struct completion
*waiting
= qc
->private_data
;
955 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
960 * ata_exec_internal - execute libata internal command
961 * @ap: Port to which the command is sent
962 * @dev: Device to which the command is sent
963 * @tf: Taskfile registers for the command and the result
964 * @dma_dir: Data tranfer direction of the command
965 * @buf: Data buffer of the command
966 * @buflen: Length of data buffer
968 * Executes libata internal command with timeout. @tf contains
969 * command on entry and result on return. Timeout and error
970 * conditions are reported via return value. No recovery action
971 * is taken after a command times out. It's caller's duty to
972 * clean up after timeout.
975 * None. Should be called with kernel context, might sleep.
979 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
980 struct ata_taskfile
*tf
,
981 int dma_dir
, void *buf
, unsigned int buflen
)
983 u8 command
= tf
->command
;
984 struct ata_queued_cmd
*qc
;
985 DECLARE_COMPLETION(wait
);
987 unsigned int err_mask
;
989 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
991 qc
= ata_qc_new_init(ap
, dev
);
995 qc
->dma_dir
= dma_dir
;
996 if (dma_dir
!= DMA_NONE
) {
997 ata_sg_init_one(qc
, buf
, buflen
);
998 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1001 qc
->private_data
= &wait
;
1002 qc
->complete_fn
= ata_qc_complete_internal
;
1006 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1008 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1009 ata_port_flush_task(ap
);
1011 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1013 /* We're racing with irq here. If we lose, the
1014 * following test prevents us from completing the qc
1015 * again. If completion irq occurs after here but
1016 * before the caller cleans up, it will result in a
1017 * spurious interrupt. We can live with that.
1019 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1020 qc
->err_mask
= AC_ERR_TIMEOUT
;
1021 ata_qc_complete(qc
);
1022 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1026 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1030 err_mask
= qc
->err_mask
;
1034 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1035 * Until those drivers are fixed, we detect the condition
1036 * here, fail the command with AC_ERR_SYSTEM and reenable the
1039 * Note that this doesn't change any behavior as internal
1040 * command failure results in disabling the device in the
1041 * higher layer for LLDDs without new reset/EH callbacks.
1043 * Kill the following code as soon as those drivers are fixed.
1045 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1046 err_mask
|= AC_ERR_SYSTEM
;
1054 * ata_pio_need_iordy - check if iordy needed
1057 * Check if the current speed of the device requires IORDY. Used
1058 * by various controllers for chip configuration.
1061 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1064 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1071 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1073 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1074 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1075 /* Is the speed faster than the drive allows non IORDY ? */
1077 /* This is cycle times not frequency - watch the logic! */
1078 if (pio
> 240) /* PIO2 is 240nS per cycle */
1087 * ata_dev_read_id - Read ID data from the specified device
1088 * @ap: port on which target device resides
1089 * @dev: target device
1090 * @p_class: pointer to class of the target device (may be changed)
1091 * @post_reset: is this read ID post-reset?
1092 * @p_id: read IDENTIFY page (newly allocated)
1094 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1095 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1096 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1097 * for pre-ATA4 drives.
1100 * Kernel thread context (may sleep)
1103 * 0 on success, -errno otherwise.
1105 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1106 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1108 unsigned int class = *p_class
;
1109 struct ata_taskfile tf
;
1110 unsigned int err_mask
= 0;
1115 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1117 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1119 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1122 reason
= "out of memory";
1127 ata_tf_init(ap
, &tf
, dev
->devno
);
1131 tf
.command
= ATA_CMD_ID_ATA
;
1134 tf
.command
= ATA_CMD_ID_ATAPI
;
1138 reason
= "unsupported class";
1142 tf
.protocol
= ATA_PROT_PIO
;
1144 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1145 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1148 reason
= "I/O error";
1152 swap_buf_le16(id
, ATA_ID_WORDS
);
1155 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1157 reason
= "device reports illegal type";
1161 if (post_reset
&& class == ATA_DEV_ATA
) {
1163 * The exact sequence expected by certain pre-ATA4 drives is:
1166 * INITIALIZE DEVICE PARAMETERS
1168 * Some drives were very specific about that exact sequence.
1170 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1171 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1174 reason
= "INIT_DEV_PARAMS failed";
1178 /* current CHS translation info (id[53-58]) might be
1179 * changed. reread the identify device info.
1191 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1192 ap
->id
, dev
->devno
, reason
);
1197 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1198 struct ata_device
*dev
)
1200 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1204 * ata_dev_configure - Configure the specified ATA/ATAPI device
1205 * @ap: Port on which target device resides
1206 * @dev: Target device to configure
1207 * @print_info: Enable device info printout
1209 * Configure @dev according to @dev->id. Generic and low-level
1210 * driver specific fixups are also applied.
1213 * Kernel thread context (may sleep)
1216 * 0 on success, -errno otherwise
1218 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1221 const u16
*id
= dev
->id
;
1222 unsigned int xfer_mask
;
1225 if (!ata_dev_enabled(dev
)) {
1226 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1227 ap
->id
, dev
->devno
);
1231 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1233 /* print device capabilities */
1235 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1236 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1237 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1238 id
[84], id
[85], id
[86], id
[87], id
[88]);
1240 /* initialize to-be-configured parameters */
1242 dev
->max_sectors
= 0;
1250 * common ATA, ATAPI feature tests
1253 /* find max transfer mode; for printk only */
1254 xfer_mask
= ata_id_xfermask(id
);
1258 /* ATA-specific feature tests */
1259 if (dev
->class == ATA_DEV_ATA
) {
1260 dev
->n_sectors
= ata_id_n_sectors(id
);
1262 if (ata_id_has_lba(id
)) {
1263 const char *lba_desc
;
1266 dev
->flags
|= ATA_DFLAG_LBA
;
1267 if (ata_id_has_lba48(id
)) {
1268 dev
->flags
|= ATA_DFLAG_LBA48
;
1272 /* print device info to dmesg */
1274 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1275 "max %s, %Lu sectors: %s\n",
1277 ata_id_major_version(id
),
1278 ata_mode_string(xfer_mask
),
1279 (unsigned long long)dev
->n_sectors
,
1284 /* Default translation */
1285 dev
->cylinders
= id
[1];
1287 dev
->sectors
= id
[6];
1289 if (ata_id_current_chs_valid(id
)) {
1290 /* Current CHS translation is valid. */
1291 dev
->cylinders
= id
[54];
1292 dev
->heads
= id
[55];
1293 dev
->sectors
= id
[56];
1296 /* print device info to dmesg */
1298 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1299 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1301 ata_id_major_version(id
),
1302 ata_mode_string(xfer_mask
),
1303 (unsigned long long)dev
->n_sectors
,
1304 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1310 /* ATAPI-specific feature tests */
1311 else if (dev
->class == ATA_DEV_ATAPI
) {
1312 rc
= atapi_cdb_len(id
);
1313 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1314 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1318 dev
->cdb_len
= (unsigned int) rc
;
1320 /* print device info to dmesg */
1322 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1323 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1326 ap
->host
->max_cmd_len
= 0;
1327 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1328 ap
->host
->max_cmd_len
= max_t(unsigned int,
1329 ap
->host
->max_cmd_len
,
1330 ap
->device
[i
].cdb_len
);
1332 /* limit bridge transfers to udma5, 200 sectors */
1333 if (ata_dev_knobble(ap
, dev
)) {
1335 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1336 ap
->id
, dev
->devno
);
1337 dev
->udma_mask
&= ATA_UDMA5
;
1338 dev
->max_sectors
= ATA_MAX_SECTORS
;
1341 if (ap
->ops
->dev_config
)
1342 ap
->ops
->dev_config(ap
, dev
);
1344 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1348 DPRINTK("EXIT, err\n");
1353 * ata_bus_probe - Reset and probe ATA bus
1356 * Master ATA bus probing function. Initiates a hardware-dependent
1357 * bus reset, then attempts to identify any devices found on
1361 * PCI/etc. bus probe sem.
1364 * Zero on success, negative errno otherwise.
1367 static int ata_bus_probe(struct ata_port
*ap
)
1369 unsigned int classes
[ATA_MAX_DEVICES
];
1370 int i
, rc
, found
= 0;
1371 struct ata_device
*dev
;
1375 /* reset and determine device classes */
1376 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1377 classes
[i
] = ATA_DEV_UNKNOWN
;
1379 if (ap
->ops
->probe_reset
) {
1380 rc
= ap
->ops
->probe_reset(ap
, classes
);
1382 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1386 ap
->ops
->phy_reset(ap
);
1388 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1389 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1390 classes
[i
] = ap
->device
[i
].class;
1395 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1396 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1397 classes
[i
] = ATA_DEV_NONE
;
1399 /* read IDENTIFY page and configure devices */
1400 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1401 dev
= &ap
->device
[i
];
1402 dev
->class = classes
[i
];
1404 if (!ata_dev_enabled(dev
))
1407 WARN_ON(dev
->id
!= NULL
);
1408 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1409 dev
->class = ATA_DEV_NONE
;
1413 if (ata_dev_configure(ap
, dev
, 1)) {
1414 ata_dev_disable(ap
, dev
);
1421 /* configure transfer mode */
1422 if (ap
->ops
->set_mode
) {
1423 /* FIXME: make ->set_mode handle no device case and
1424 * return error code and failing device on failure as
1425 * ata_set_mode() does.
1428 ap
->ops
->set_mode(ap
);
1431 while (ata_set_mode(ap
, &dev
))
1432 ata_dev_disable(ap
, dev
);
1435 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1436 if (ata_dev_enabled(&ap
->device
[i
]))
1439 /* no device present, disable port */
1440 ata_port_disable(ap
);
1441 ap
->ops
->port_disable(ap
);
1446 * ata_port_probe - Mark port as enabled
1447 * @ap: Port for which we indicate enablement
1449 * Modify @ap data structure such that the system
1450 * thinks that the entire port is enabled.
1452 * LOCKING: host_set lock, or some other form of
1456 void ata_port_probe(struct ata_port
*ap
)
1458 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1462 * sata_print_link_status - Print SATA link status
1463 * @ap: SATA port to printk link status about
1465 * This function prints link speed and status of a SATA link.
1470 static void sata_print_link_status(struct ata_port
*ap
)
1474 if (!ap
->ops
->scr_read
)
1477 sstatus
= scr_read(ap
, SCR_STATUS
);
1479 if (sata_dev_present(ap
)) {
1480 tmp
= (sstatus
>> 4) & 0xf;
1481 printk(KERN_INFO
"ata%u: SATA link up %s (SStatus %X)\n",
1482 ap
->id
, sata_spd_string(tmp
), sstatus
);
1484 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1490 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1491 * @ap: SATA port associated with target SATA PHY.
1493 * This function issues commands to standard SATA Sxxx
1494 * PHY registers, to wake up the phy (and device), and
1495 * clear any reset condition.
1498 * PCI/etc. bus probe sem.
1501 void __sata_phy_reset(struct ata_port
*ap
)
1504 unsigned long timeout
= jiffies
+ (HZ
* 5);
1506 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1507 /* issue phy wake/reset */
1508 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1509 /* Couldn't find anything in SATA I/II specs, but
1510 * AHCI-1.1 10.4.2 says at least 1 ms. */
1513 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1515 /* wait for phy to become ready, if necessary */
1518 sstatus
= scr_read(ap
, SCR_STATUS
);
1519 if ((sstatus
& 0xf) != 1)
1521 } while (time_before(jiffies
, timeout
));
1523 /* print link status */
1524 sata_print_link_status(ap
);
1526 /* TODO: phy layer with polling, timeouts, etc. */
1527 if (sata_dev_present(ap
))
1530 ata_port_disable(ap
);
1532 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1535 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1536 ata_port_disable(ap
);
1540 ap
->cbl
= ATA_CBL_SATA
;
1544 * sata_phy_reset - Reset SATA bus.
1545 * @ap: SATA port associated with target SATA PHY.
1547 * This function resets the SATA bus, and then probes
1548 * the bus for devices.
1551 * PCI/etc. bus probe sem.
1554 void sata_phy_reset(struct ata_port
*ap
)
1556 __sata_phy_reset(ap
);
1557 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1563 * ata_dev_pair - return other device on cable
1567 * Obtain the other device on the same cable, or if none is
1568 * present NULL is returned
1571 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1573 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1574 if (!ata_dev_enabled(pair
))
1580 * ata_port_disable - Disable port.
1581 * @ap: Port to be disabled.
1583 * Modify @ap data structure such that the system
1584 * thinks that the entire port is disabled, and should
1585 * never attempt to probe or communicate with devices
1588 * LOCKING: host_set lock, or some other form of
1592 void ata_port_disable(struct ata_port
*ap
)
1594 ap
->device
[0].class = ATA_DEV_NONE
;
1595 ap
->device
[1].class = ATA_DEV_NONE
;
1596 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1600 * This mode timing computation functionality is ported over from
1601 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1604 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1605 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1606 * for PIO 5, which is a nonstandard extension and UDMA6, which
1607 * is currently supported only by Maxtor drives.
1610 static const struct ata_timing ata_timing
[] = {
1612 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1613 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1614 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1615 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1617 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1618 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1619 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1621 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1623 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1624 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1625 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1627 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1628 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1629 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1631 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1632 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1633 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1635 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1636 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1637 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1639 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1644 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1645 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1647 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1649 q
->setup
= EZ(t
->setup
* 1000, T
);
1650 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1651 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1652 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1653 q
->active
= EZ(t
->active
* 1000, T
);
1654 q
->recover
= EZ(t
->recover
* 1000, T
);
1655 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1656 q
->udma
= EZ(t
->udma
* 1000, UT
);
1659 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1660 struct ata_timing
*m
, unsigned int what
)
1662 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1663 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1664 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1665 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1666 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1667 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1668 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1669 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1672 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1674 const struct ata_timing
*t
;
1676 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1677 if (t
->mode
== 0xFF)
1682 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1683 struct ata_timing
*t
, int T
, int UT
)
1685 const struct ata_timing
*s
;
1686 struct ata_timing p
;
1692 if (!(s
= ata_timing_find_mode(speed
)))
1695 memcpy(t
, s
, sizeof(*s
));
1698 * If the drive is an EIDE drive, it can tell us it needs extended
1699 * PIO/MW_DMA cycle timing.
1702 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1703 memset(&p
, 0, sizeof(p
));
1704 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1705 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1706 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1707 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1708 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1710 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1714 * Convert the timing to bus clock counts.
1717 ata_timing_quantize(t
, t
, T
, UT
);
1720 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1721 * S.M.A.R.T * and some other commands. We have to ensure that the
1722 * DMA cycle timing is slower/equal than the fastest PIO timing.
1725 if (speed
> XFER_PIO_4
) {
1726 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1727 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1731 * Lengthen active & recovery time so that cycle time is correct.
1734 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1735 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1736 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1739 if (t
->active
+ t
->recover
< t
->cycle
) {
1740 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1741 t
->recover
= t
->cycle
- t
->active
;
1747 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1749 unsigned int err_mask
;
1752 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1753 dev
->flags
|= ATA_DFLAG_PIO
;
1755 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1758 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1763 rc
= ata_dev_revalidate(ap
, dev
, 0);
1766 "ata%u: failed to revalidate after set xfermode\n",
1771 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1772 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1774 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1776 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1781 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1782 * @ap: port on which timings will be programmed
1783 * @r_failed_dev: out paramter for failed device
1785 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1786 * ata_set_mode() fails, pointer to the failing device is
1787 * returned in @r_failed_dev.
1790 * PCI/etc. bus probe sem.
1793 * 0 on success, negative errno otherwise
1795 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1797 struct ata_device
*dev
;
1798 int i
, rc
= 0, used_dma
= 0, found
= 0;
1800 /* step 1: calculate xfer_mask */
1801 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1802 unsigned int pio_mask
, dma_mask
;
1804 dev
= &ap
->device
[i
];
1806 if (!ata_dev_enabled(dev
))
1809 ata_dev_xfermask(ap
, dev
);
1811 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
1812 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
1813 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
1814 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
1823 /* step 2: always set host PIO timings */
1824 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1825 dev
= &ap
->device
[i
];
1826 if (!ata_dev_enabled(dev
))
1829 if (!dev
->pio_mode
) {
1830 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
1831 ap
->id
, dev
->devno
);
1836 dev
->xfer_mode
= dev
->pio_mode
;
1837 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1838 if (ap
->ops
->set_piomode
)
1839 ap
->ops
->set_piomode(ap
, dev
);
1842 /* step 3: set host DMA timings */
1843 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1844 dev
= &ap
->device
[i
];
1846 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
1849 dev
->xfer_mode
= dev
->dma_mode
;
1850 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1851 if (ap
->ops
->set_dmamode
)
1852 ap
->ops
->set_dmamode(ap
, dev
);
1855 /* step 4: update devices' xfer mode */
1856 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1857 dev
= &ap
->device
[i
];
1859 if (!ata_dev_enabled(dev
))
1862 rc
= ata_dev_set_mode(ap
, dev
);
1867 /* Record simplex status. If we selected DMA then the other
1868 * host channels are not permitted to do so.
1870 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
1871 ap
->host_set
->simplex_claimed
= 1;
1873 /* step5: chip specific finalisation */
1874 if (ap
->ops
->post_set_mode
)
1875 ap
->ops
->post_set_mode(ap
);
1879 *r_failed_dev
= dev
;
1884 * ata_tf_to_host - issue ATA taskfile to host controller
1885 * @ap: port to which command is being issued
1886 * @tf: ATA taskfile register set
1888 * Issues ATA taskfile register set to ATA host controller,
1889 * with proper synchronization with interrupt handler and
1893 * spin_lock_irqsave(host_set lock)
1896 static inline void ata_tf_to_host(struct ata_port
*ap
,
1897 const struct ata_taskfile
*tf
)
1899 ap
->ops
->tf_load(ap
, tf
);
1900 ap
->ops
->exec_command(ap
, tf
);
1904 * ata_busy_sleep - sleep until BSY clears, or timeout
1905 * @ap: port containing status register to be polled
1906 * @tmout_pat: impatience timeout
1907 * @tmout: overall timeout
1909 * Sleep until ATA Status register bit BSY clears,
1910 * or a timeout occurs.
1915 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1916 unsigned long tmout_pat
, unsigned long tmout
)
1918 unsigned long timer_start
, timeout
;
1921 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1922 timer_start
= jiffies
;
1923 timeout
= timer_start
+ tmout_pat
;
1924 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1926 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1929 if (status
& ATA_BUSY
)
1930 printk(KERN_WARNING
"ata%u is slow to respond, "
1931 "please be patient\n", ap
->id
);
1933 timeout
= timer_start
+ tmout
;
1934 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1936 status
= ata_chk_status(ap
);
1939 if (status
& ATA_BUSY
) {
1940 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1941 ap
->id
, tmout
/ HZ
);
1948 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1950 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1951 unsigned int dev0
= devmask
& (1 << 0);
1952 unsigned int dev1
= devmask
& (1 << 1);
1953 unsigned long timeout
;
1955 /* if device 0 was found in ata_devchk, wait for its
1959 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1961 /* if device 1 was found in ata_devchk, wait for
1962 * register access, then wait for BSY to clear
1964 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1968 ap
->ops
->dev_select(ap
, 1);
1969 if (ap
->flags
& ATA_FLAG_MMIO
) {
1970 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1971 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1973 nsect
= inb(ioaddr
->nsect_addr
);
1974 lbal
= inb(ioaddr
->lbal_addr
);
1976 if ((nsect
== 1) && (lbal
== 1))
1978 if (time_after(jiffies
, timeout
)) {
1982 msleep(50); /* give drive a breather */
1985 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1987 /* is all this really necessary? */
1988 ap
->ops
->dev_select(ap
, 0);
1990 ap
->ops
->dev_select(ap
, 1);
1992 ap
->ops
->dev_select(ap
, 0);
1995 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1996 unsigned int devmask
)
1998 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2000 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2002 /* software reset. causes dev0 to be selected */
2003 if (ap
->flags
& ATA_FLAG_MMIO
) {
2004 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2005 udelay(20); /* FIXME: flush */
2006 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2007 udelay(20); /* FIXME: flush */
2008 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2010 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2012 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2014 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2017 /* spec mandates ">= 2ms" before checking status.
2018 * We wait 150ms, because that was the magic delay used for
2019 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2020 * between when the ATA command register is written, and then
2021 * status is checked. Because waiting for "a while" before
2022 * checking status is fine, post SRST, we perform this magic
2023 * delay here as well.
2025 * Old drivers/ide uses the 2mS rule and then waits for ready
2029 /* Before we perform post reset processing we want to see if
2030 * the bus shows 0xFF because the odd clown forgets the D7
2031 * pulldown resistor.
2033 if (ata_check_status(ap
) == 0xFF)
2034 return AC_ERR_OTHER
;
2036 ata_bus_post_reset(ap
, devmask
);
2042 * ata_bus_reset - reset host port and associated ATA channel
2043 * @ap: port to reset
2045 * This is typically the first time we actually start issuing
2046 * commands to the ATA channel. We wait for BSY to clear, then
2047 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2048 * result. Determine what devices, if any, are on the channel
2049 * by looking at the device 0/1 error register. Look at the signature
2050 * stored in each device's taskfile registers, to determine if
2051 * the device is ATA or ATAPI.
2054 * PCI/etc. bus probe sem.
2055 * Obtains host_set lock.
2058 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2061 void ata_bus_reset(struct ata_port
*ap
)
2063 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2064 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2066 unsigned int dev0
, dev1
= 0, devmask
= 0;
2068 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2070 /* determine if device 0/1 are present */
2071 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2074 dev0
= ata_devchk(ap
, 0);
2076 dev1
= ata_devchk(ap
, 1);
2080 devmask
|= (1 << 0);
2082 devmask
|= (1 << 1);
2084 /* select device 0 again */
2085 ap
->ops
->dev_select(ap
, 0);
2087 /* issue bus reset */
2088 if (ap
->flags
& ATA_FLAG_SRST
)
2089 if (ata_bus_softreset(ap
, devmask
))
2093 * determine by signature whether we have ATA or ATAPI devices
2095 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2096 if ((slave_possible
) && (err
!= 0x81))
2097 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2099 /* re-enable interrupts */
2100 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2103 /* is double-select really necessary? */
2104 if (ap
->device
[1].class != ATA_DEV_NONE
)
2105 ap
->ops
->dev_select(ap
, 1);
2106 if (ap
->device
[0].class != ATA_DEV_NONE
)
2107 ap
->ops
->dev_select(ap
, 0);
2109 /* if no devices were detected, disable this port */
2110 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2111 (ap
->device
[1].class == ATA_DEV_NONE
))
2114 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2115 /* set up device control for ATA_FLAG_SATA_RESET */
2116 if (ap
->flags
& ATA_FLAG_MMIO
)
2117 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2119 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2126 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2127 ap
->ops
->port_disable(ap
);
2132 static int sata_phy_resume(struct ata_port
*ap
)
2134 unsigned long timeout
= jiffies
+ (HZ
* 5);
2137 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2139 /* Wait for phy to become ready, if necessary. */
2142 sstatus
= scr_read(ap
, SCR_STATUS
);
2143 if ((sstatus
& 0xf) != 1)
2145 } while (time_before(jiffies
, timeout
));
2151 * ata_std_probeinit - initialize probing
2152 * @ap: port to be probed
2154 * @ap is about to be probed. Initialize it. This function is
2155 * to be used as standard callback for ata_drive_probe_reset().
2157 * NOTE!!! Do not use this function as probeinit if a low level
2158 * driver implements only hardreset. Just pass NULL as probeinit
2159 * in that case. Using this function is probably okay but doing
2160 * so makes reset sequence different from the original
2161 * ->phy_reset implementation and Jeff nervous. :-P
2163 void ata_std_probeinit(struct ata_port
*ap
)
2165 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2166 sata_phy_resume(ap
);
2167 if (sata_dev_present(ap
))
2168 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2173 * ata_std_softreset - reset host port via ATA SRST
2174 * @ap: port to reset
2175 * @verbose: fail verbosely
2176 * @classes: resulting classes of attached devices
2178 * Reset host port using ATA SRST. This function is to be used
2179 * as standard callback for ata_drive_*_reset() functions.
2182 * Kernel thread context (may sleep)
2185 * 0 on success, -errno otherwise.
2187 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2189 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2190 unsigned int devmask
= 0, err_mask
;
2195 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2196 classes
[0] = ATA_DEV_NONE
;
2200 /* determine if device 0/1 are present */
2201 if (ata_devchk(ap
, 0))
2202 devmask
|= (1 << 0);
2203 if (slave_possible
&& ata_devchk(ap
, 1))
2204 devmask
|= (1 << 1);
2206 /* select device 0 again */
2207 ap
->ops
->dev_select(ap
, 0);
2209 /* issue bus reset */
2210 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2211 err_mask
= ata_bus_softreset(ap
, devmask
);
2214 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2217 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2222 /* determine by signature whether we have ATA or ATAPI devices */
2223 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2224 if (slave_possible
&& err
!= 0x81)
2225 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2228 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2233 * sata_std_hardreset - reset host port via SATA phy reset
2234 * @ap: port to reset
2235 * @verbose: fail verbosely
2236 * @class: resulting class of attached device
2238 * SATA phy-reset host port using DET bits of SControl register.
2239 * This function is to be used as standard callback for
2240 * ata_drive_*_reset().
2243 * Kernel thread context (may sleep)
2246 * 0 on success, -errno otherwise.
2248 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2252 /* Issue phy wake/reset */
2253 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2256 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2257 * 10.4.2 says at least 1 ms.
2261 /* Bring phy back */
2262 sata_phy_resume(ap
);
2264 /* TODO: phy layer with polling, timeouts, etc. */
2265 if (!sata_dev_present(ap
)) {
2266 *class = ATA_DEV_NONE
;
2267 DPRINTK("EXIT, link offline\n");
2271 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2273 printk(KERN_ERR
"ata%u: COMRESET failed "
2274 "(device not ready)\n", ap
->id
);
2276 DPRINTK("EXIT, device not ready\n");
2280 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2282 *class = ata_dev_try_classify(ap
, 0, NULL
);
2284 DPRINTK("EXIT, class=%u\n", *class);
2289 * ata_std_postreset - standard postreset callback
2290 * @ap: the target ata_port
2291 * @classes: classes of attached devices
2293 * This function is invoked after a successful reset. Note that
2294 * the device might have been reset more than once using
2295 * different reset methods before postreset is invoked.
2297 * This function is to be used as standard callback for
2298 * ata_drive_*_reset().
2301 * Kernel thread context (may sleep)
2303 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2307 /* set cable type if it isn't already set */
2308 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2309 ap
->cbl
= ATA_CBL_SATA
;
2311 /* print link status */
2312 if (ap
->cbl
== ATA_CBL_SATA
)
2313 sata_print_link_status(ap
);
2315 /* re-enable interrupts */
2316 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2319 /* is double-select really necessary? */
2320 if (classes
[0] != ATA_DEV_NONE
)
2321 ap
->ops
->dev_select(ap
, 1);
2322 if (classes
[1] != ATA_DEV_NONE
)
2323 ap
->ops
->dev_select(ap
, 0);
2325 /* bail out if no device is present */
2326 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2327 DPRINTK("EXIT, no device\n");
2331 /* set up device control */
2332 if (ap
->ioaddr
.ctl_addr
) {
2333 if (ap
->flags
& ATA_FLAG_MMIO
)
2334 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2336 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2343 * ata_std_probe_reset - standard probe reset method
2344 * @ap: prot to perform probe-reset
2345 * @classes: resulting classes of attached devices
2347 * The stock off-the-shelf ->probe_reset method.
2350 * Kernel thread context (may sleep)
2353 * 0 on success, -errno otherwise.
2355 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2357 ata_reset_fn_t hardreset
;
2360 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2361 hardreset
= sata_std_hardreset
;
2363 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2364 ata_std_softreset
, hardreset
,
2365 ata_std_postreset
, classes
);
2368 static int ata_do_reset(struct ata_port
*ap
,
2369 ata_reset_fn_t reset
, ata_postreset_fn_t postreset
,
2370 int verbose
, unsigned int *classes
)
2374 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2375 classes
[i
] = ATA_DEV_UNKNOWN
;
2377 rc
= reset(ap
, verbose
, classes
);
2381 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2382 * is complete and convert all ATA_DEV_UNKNOWN to
2385 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2386 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2389 if (i
< ATA_MAX_DEVICES
)
2390 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2391 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2392 classes
[i
] = ATA_DEV_NONE
;
2395 postreset(ap
, classes
);
2401 * ata_drive_probe_reset - Perform probe reset with given methods
2402 * @ap: port to reset
2403 * @probeinit: probeinit method (can be NULL)
2404 * @softreset: softreset method (can be NULL)
2405 * @hardreset: hardreset method (can be NULL)
2406 * @postreset: postreset method (can be NULL)
2407 * @classes: resulting classes of attached devices
2409 * Reset the specified port and classify attached devices using
2410 * given methods. This function prefers softreset but tries all
2411 * possible reset sequences to reset and classify devices. This
2412 * function is intended to be used for constructing ->probe_reset
2413 * callback by low level drivers.
2415 * Reset methods should follow the following rules.
2417 * - Return 0 on sucess, -errno on failure.
2418 * - If classification is supported, fill classes[] with
2419 * recognized class codes.
2420 * - If classification is not supported, leave classes[] alone.
2421 * - If verbose is non-zero, print error message on failure;
2422 * otherwise, shut up.
2425 * Kernel thread context (may sleep)
2428 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2429 * if classification fails, and any error code from reset
2432 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2433 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2434 ata_postreset_fn_t postreset
, unsigned int *classes
)
2442 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2443 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2450 rc
= ata_do_reset(ap
, hardreset
, postreset
, 0, classes
);
2451 if (rc
|| classes
[0] != ATA_DEV_UNKNOWN
)
2455 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2458 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2464 * ata_dev_same_device - Determine whether new ID matches configured device
2465 * @ap: port on which the device to compare against resides
2466 * @dev: device to compare against
2467 * @new_class: class of the new device
2468 * @new_id: IDENTIFY page of the new device
2470 * Compare @new_class and @new_id against @dev and determine
2471 * whether @dev is the device indicated by @new_class and
2478 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2480 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2481 unsigned int new_class
, const u16
*new_id
)
2483 const u16
*old_id
= dev
->id
;
2484 unsigned char model
[2][41], serial
[2][21];
2487 if (dev
->class != new_class
) {
2489 "ata%u: dev %u class mismatch %d != %d\n",
2490 ap
->id
, dev
->devno
, dev
->class, new_class
);
2494 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2495 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2496 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2497 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2498 new_n_sectors
= ata_id_n_sectors(new_id
);
2500 if (strcmp(model
[0], model
[1])) {
2502 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2503 ap
->id
, dev
->devno
, model
[0], model
[1]);
2507 if (strcmp(serial
[0], serial
[1])) {
2509 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2510 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2514 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2516 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2517 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2518 (unsigned long long)new_n_sectors
);
2526 * ata_dev_revalidate - Revalidate ATA device
2527 * @ap: port on which the device to revalidate resides
2528 * @dev: device to revalidate
2529 * @post_reset: is this revalidation after reset?
2531 * Re-read IDENTIFY page and make sure @dev is still attached to
2535 * Kernel thread context (may sleep)
2538 * 0 on success, negative errno otherwise
2540 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2547 if (!ata_dev_enabled(dev
))
2553 /* allocate & read ID data */
2554 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2558 /* is the device still there? */
2559 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2567 /* configure device according to the new ID */
2568 return ata_dev_configure(ap
, dev
, 0);
2571 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2572 ap
->id
, dev
->devno
, rc
);
2577 static const char * const ata_dma_blacklist
[] = {
2578 "WDC AC11000H", NULL
,
2579 "WDC AC22100H", NULL
,
2580 "WDC AC32500H", NULL
,
2581 "WDC AC33100H", NULL
,
2582 "WDC AC31600H", NULL
,
2583 "WDC AC32100H", "24.09P07",
2584 "WDC AC23200L", "21.10N21",
2585 "Compaq CRD-8241B", NULL
,
2590 "SanDisk SDP3B", NULL
,
2591 "SanDisk SDP3B-64", NULL
,
2592 "SANYO CD-ROM CRD", NULL
,
2593 "HITACHI CDR-8", NULL
,
2594 "HITACHI CDR-8335", NULL
,
2595 "HITACHI CDR-8435", NULL
,
2596 "Toshiba CD-ROM XM-6202B", NULL
,
2597 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2599 "E-IDE CD-ROM CR-840", NULL
,
2600 "CD-ROM Drive/F5A", NULL
,
2601 "WPI CDD-820", NULL
,
2602 "SAMSUNG CD-ROM SC-148C", NULL
,
2603 "SAMSUNG CD-ROM SC", NULL
,
2604 "SanDisk SDP3B-64", NULL
,
2605 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2606 "_NEC DV5800A", NULL
,
2607 "SAMSUNG CD-ROM SN-124", "N001"
2610 static int ata_strim(char *s
, size_t len
)
2612 len
= strnlen(s
, len
);
2614 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2615 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2622 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2624 unsigned char model_num
[40];
2625 unsigned char model_rev
[16];
2626 unsigned int nlen
, rlen
;
2629 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2631 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2633 nlen
= ata_strim(model_num
, sizeof(model_num
));
2634 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2636 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2637 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2638 if (ata_dma_blacklist
[i
+1] == NULL
)
2640 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2648 * ata_dev_xfermask - Compute supported xfermask of the given device
2649 * @ap: Port on which the device to compute xfermask for resides
2650 * @dev: Device to compute xfermask for
2652 * Compute supported xfermask of @dev and store it in
2653 * dev->*_mask. This function is responsible for applying all
2654 * known limits including host controller limits, device
2657 * FIXME: The current implementation limits all transfer modes to
2658 * the fastest of the lowested device on the port. This is not
2659 * required on most controllers.
2664 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2666 struct ata_host_set
*hs
= ap
->host_set
;
2667 unsigned long xfer_mask
;
2670 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2673 /* FIXME: Use port-wide xfermask for now */
2674 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2675 struct ata_device
*d
= &ap
->device
[i
];
2676 if (!ata_dev_enabled(d
))
2678 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
, d
->mwdma_mask
,
2680 xfer_mask
&= ata_id_xfermask(d
->id
);
2681 if (ata_dma_blacklisted(d
))
2682 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2683 /* Apply cable rule here. Don't apply it early because when
2684 we handle hot plug the cable type can itself change */
2685 if (ap
->cbl
== ATA_CBL_PATA40
)
2686 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2689 if (ata_dma_blacklisted(dev
))
2690 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2691 "disabling DMA\n", ap
->id
, dev
->devno
);
2693 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2694 if (hs
->simplex_claimed
)
2695 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2697 if (ap
->ops
->mode_filter
)
2698 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2700 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2705 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2706 * @ap: Port associated with device @dev
2707 * @dev: Device to which command will be sent
2709 * Issue SET FEATURES - XFER MODE command to device @dev
2713 * PCI/etc. bus probe sem.
2716 * 0 on success, AC_ERR_* mask otherwise.
2719 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2720 struct ata_device
*dev
)
2722 struct ata_taskfile tf
;
2723 unsigned int err_mask
;
2725 /* set up set-features taskfile */
2726 DPRINTK("set features - xfer mode\n");
2728 ata_tf_init(ap
, &tf
, dev
->devno
);
2729 tf
.command
= ATA_CMD_SET_FEATURES
;
2730 tf
.feature
= SETFEATURES_XFER
;
2731 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2732 tf
.protocol
= ATA_PROT_NODATA
;
2733 tf
.nsect
= dev
->xfer_mode
;
2735 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2737 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2742 * ata_dev_init_params - Issue INIT DEV PARAMS command
2743 * @ap: Port associated with device @dev
2744 * @dev: Device to which command will be sent
2747 * Kernel thread context (may sleep)
2750 * 0 on success, AC_ERR_* mask otherwise.
2753 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2754 struct ata_device
*dev
,
2758 struct ata_taskfile tf
;
2759 unsigned int err_mask
;
2761 /* Number of sectors per track 1-255. Number of heads 1-16 */
2762 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2763 return AC_ERR_INVALID
;
2765 /* set up init dev params taskfile */
2766 DPRINTK("init dev params \n");
2768 ata_tf_init(ap
, &tf
, dev
->devno
);
2769 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2770 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2771 tf
.protocol
= ATA_PROT_NODATA
;
2773 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2775 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2777 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2782 * ata_sg_clean - Unmap DMA memory associated with command
2783 * @qc: Command containing DMA memory to be released
2785 * Unmap all mapped DMA memory associated with this command.
2788 * spin_lock_irqsave(host_set lock)
2791 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2793 struct ata_port
*ap
= qc
->ap
;
2794 struct scatterlist
*sg
= qc
->__sg
;
2795 int dir
= qc
->dma_dir
;
2796 void *pad_buf
= NULL
;
2798 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2799 WARN_ON(sg
== NULL
);
2801 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2802 WARN_ON(qc
->n_elem
> 1);
2804 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2806 /* if we padded the buffer out to 32-bit bound, and data
2807 * xfer direction is from-device, we must copy from the
2808 * pad buffer back into the supplied buffer
2810 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2811 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2813 if (qc
->flags
& ATA_QCFLAG_SG
) {
2815 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
2816 /* restore last sg */
2817 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2819 struct scatterlist
*psg
= &qc
->pad_sgent
;
2820 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2821 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2822 kunmap_atomic(addr
, KM_IRQ0
);
2826 dma_unmap_single(ap
->dev
,
2827 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2830 sg
->length
+= qc
->pad_len
;
2832 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2833 pad_buf
, qc
->pad_len
);
2836 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2841 * ata_fill_sg - Fill PCI IDE PRD table
2842 * @qc: Metadata associated with taskfile to be transferred
2844 * Fill PCI IDE PRD (scatter-gather) table with segments
2845 * associated with the current disk command.
2848 * spin_lock_irqsave(host_set lock)
2851 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2853 struct ata_port
*ap
= qc
->ap
;
2854 struct scatterlist
*sg
;
2857 WARN_ON(qc
->__sg
== NULL
);
2858 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2861 ata_for_each_sg(sg
, qc
) {
2865 /* determine if physical DMA addr spans 64K boundary.
2866 * Note h/w doesn't support 64-bit, so we unconditionally
2867 * truncate dma_addr_t to u32.
2869 addr
= (u32
) sg_dma_address(sg
);
2870 sg_len
= sg_dma_len(sg
);
2873 offset
= addr
& 0xffff;
2875 if ((offset
+ sg_len
) > 0x10000)
2876 len
= 0x10000 - offset
;
2878 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2879 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2880 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2889 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2892 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2893 * @qc: Metadata associated with taskfile to check
2895 * Allow low-level driver to filter ATA PACKET commands, returning
2896 * a status indicating whether or not it is OK to use DMA for the
2897 * supplied PACKET command.
2900 * spin_lock_irqsave(host_set lock)
2902 * RETURNS: 0 when ATAPI DMA can be used
2905 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2907 struct ata_port
*ap
= qc
->ap
;
2908 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2910 if (ap
->ops
->check_atapi_dma
)
2911 rc
= ap
->ops
->check_atapi_dma(qc
);
2916 * ata_qc_prep - Prepare taskfile for submission
2917 * @qc: Metadata associated with taskfile to be prepared
2919 * Prepare ATA taskfile for submission.
2922 * spin_lock_irqsave(host_set lock)
2924 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2926 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2932 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
2935 * ata_sg_init_one - Associate command with memory buffer
2936 * @qc: Command to be associated
2937 * @buf: Memory buffer
2938 * @buflen: Length of memory buffer, in bytes.
2940 * Initialize the data-related elements of queued_cmd @qc
2941 * to point to a single memory buffer, @buf of byte length @buflen.
2944 * spin_lock_irqsave(host_set lock)
2947 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2949 struct scatterlist
*sg
;
2951 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2953 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2954 qc
->__sg
= &qc
->sgent
;
2956 qc
->orig_n_elem
= 1;
2960 sg_init_one(sg
, buf
, buflen
);
2964 * ata_sg_init - Associate command with scatter-gather table.
2965 * @qc: Command to be associated
2966 * @sg: Scatter-gather table.
2967 * @n_elem: Number of elements in s/g table.
2969 * Initialize the data-related elements of queued_cmd @qc
2970 * to point to a scatter-gather table @sg, containing @n_elem
2974 * spin_lock_irqsave(host_set lock)
2977 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2978 unsigned int n_elem
)
2980 qc
->flags
|= ATA_QCFLAG_SG
;
2982 qc
->n_elem
= n_elem
;
2983 qc
->orig_n_elem
= n_elem
;
2987 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2988 * @qc: Command with memory buffer to be mapped.
2990 * DMA-map the memory buffer associated with queued_cmd @qc.
2993 * spin_lock_irqsave(host_set lock)
2996 * Zero on success, negative on error.
2999 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3001 struct ata_port
*ap
= qc
->ap
;
3002 int dir
= qc
->dma_dir
;
3003 struct scatterlist
*sg
= qc
->__sg
;
3004 dma_addr_t dma_address
;
3007 /* we must lengthen transfers to end on a 32-bit boundary */
3008 qc
->pad_len
= sg
->length
& 3;
3010 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3011 struct scatterlist
*psg
= &qc
->pad_sgent
;
3013 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3015 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3017 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3018 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3021 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3022 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3024 sg
->length
-= qc
->pad_len
;
3025 if (sg
->length
== 0)
3028 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3029 sg
->length
, qc
->pad_len
);
3037 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3039 if (dma_mapping_error(dma_address
)) {
3041 sg
->length
+= qc
->pad_len
;
3045 sg_dma_address(sg
) = dma_address
;
3046 sg_dma_len(sg
) = sg
->length
;
3049 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3050 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3056 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3057 * @qc: Command with scatter-gather table to be mapped.
3059 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3062 * spin_lock_irqsave(host_set lock)
3065 * Zero on success, negative on error.
3069 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3071 struct ata_port
*ap
= qc
->ap
;
3072 struct scatterlist
*sg
= qc
->__sg
;
3073 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3074 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3076 VPRINTK("ENTER, ata%u\n", ap
->id
);
3077 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3079 /* we must lengthen transfers to end on a 32-bit boundary */
3080 qc
->pad_len
= lsg
->length
& 3;
3082 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3083 struct scatterlist
*psg
= &qc
->pad_sgent
;
3084 unsigned int offset
;
3086 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3088 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3091 * psg->page/offset are used to copy to-be-written
3092 * data in this function or read data in ata_sg_clean.
3094 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3095 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3096 psg
->offset
= offset_in_page(offset
);
3098 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3099 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3100 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3101 kunmap_atomic(addr
, KM_IRQ0
);
3104 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3105 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3107 lsg
->length
-= qc
->pad_len
;
3108 if (lsg
->length
== 0)
3111 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3112 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3115 pre_n_elem
= qc
->n_elem
;
3116 if (trim_sg
&& pre_n_elem
)
3125 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3127 /* restore last sg */
3128 lsg
->length
+= qc
->pad_len
;
3132 DPRINTK("%d sg elements mapped\n", n_elem
);
3135 qc
->n_elem
= n_elem
;
3141 * ata_poll_qc_complete - turn irq back on and finish qc
3142 * @qc: Command to complete
3143 * @err_mask: ATA status register content
3146 * None. (grabs host lock)
3149 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3151 struct ata_port
*ap
= qc
->ap
;
3152 unsigned long flags
;
3154 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3155 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3157 ata_qc_complete(qc
);
3158 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3162 * ata_pio_poll - poll using PIO, depending on current state
3163 * @ap: the target ata_port
3166 * None. (executing in kernel thread context)
3169 * timeout value to use
3172 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3174 struct ata_queued_cmd
*qc
;
3176 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3177 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3179 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3180 WARN_ON(qc
== NULL
);
3182 switch (ap
->hsm_task_state
) {
3185 poll_state
= HSM_ST_POLL
;
3189 case HSM_ST_LAST_POLL
:
3190 poll_state
= HSM_ST_LAST_POLL
;
3191 reg_state
= HSM_ST_LAST
;
3198 status
= ata_chk_status(ap
);
3199 if (status
& ATA_BUSY
) {
3200 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3201 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3202 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3205 ap
->hsm_task_state
= poll_state
;
3206 return ATA_SHORT_PAUSE
;
3209 ap
->hsm_task_state
= reg_state
;
3214 * ata_pio_complete - check if drive is busy or idle
3215 * @ap: the target ata_port
3218 * None. (executing in kernel thread context)
3221 * Non-zero if qc completed, zero otherwise.
3224 static int ata_pio_complete (struct ata_port
*ap
)
3226 struct ata_queued_cmd
*qc
;
3230 * This is purely heuristic. This is a fast path. Sometimes when
3231 * we enter, BSY will be cleared in a chk-status or two. If not,
3232 * the drive is probably seeking or something. Snooze for a couple
3233 * msecs, then chk-status again. If still busy, fall back to
3234 * HSM_ST_POLL state.
3236 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3237 if (drv_stat
& ATA_BUSY
) {
3239 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3240 if (drv_stat
& ATA_BUSY
) {
3241 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3242 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3247 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3248 WARN_ON(qc
== NULL
);
3250 drv_stat
= ata_wait_idle(ap
);
3251 if (!ata_ok(drv_stat
)) {
3252 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3253 ap
->hsm_task_state
= HSM_ST_ERR
;
3257 ap
->hsm_task_state
= HSM_ST_IDLE
;
3259 WARN_ON(qc
->err_mask
);
3260 ata_poll_qc_complete(qc
);
3262 /* another command may start at this point */
3269 * swap_buf_le16 - swap halves of 16-bit words in place
3270 * @buf: Buffer to swap
3271 * @buf_words: Number of 16-bit words in buffer.
3273 * Swap halves of 16-bit words if needed to convert from
3274 * little-endian byte order to native cpu byte order, or
3278 * Inherited from caller.
3280 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3285 for (i
= 0; i
< buf_words
; i
++)
3286 buf
[i
] = le16_to_cpu(buf
[i
]);
3287 #endif /* __BIG_ENDIAN */
3291 * ata_mmio_data_xfer - Transfer data by MMIO
3292 * @ap: port to read/write
3294 * @buflen: buffer length
3295 * @write_data: read/write
3297 * Transfer data from/to the device data register by MMIO.
3300 * Inherited from caller.
3303 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3304 unsigned int buflen
, int write_data
)
3307 unsigned int words
= buflen
>> 1;
3308 u16
*buf16
= (u16
*) buf
;
3309 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3311 /* Transfer multiple of 2 bytes */
3313 for (i
= 0; i
< words
; i
++)
3314 writew(le16_to_cpu(buf16
[i
]), mmio
);
3316 for (i
= 0; i
< words
; i
++)
3317 buf16
[i
] = cpu_to_le16(readw(mmio
));
3320 /* Transfer trailing 1 byte, if any. */
3321 if (unlikely(buflen
& 0x01)) {
3322 u16 align_buf
[1] = { 0 };
3323 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3326 memcpy(align_buf
, trailing_buf
, 1);
3327 writew(le16_to_cpu(align_buf
[0]), mmio
);
3329 align_buf
[0] = cpu_to_le16(readw(mmio
));
3330 memcpy(trailing_buf
, align_buf
, 1);
3336 * ata_pio_data_xfer - Transfer data by PIO
3337 * @ap: port to read/write
3339 * @buflen: buffer length
3340 * @write_data: read/write
3342 * Transfer data from/to the device data register by PIO.
3345 * Inherited from caller.
3348 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3349 unsigned int buflen
, int write_data
)
3351 unsigned int words
= buflen
>> 1;
3353 /* Transfer multiple of 2 bytes */
3355 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3357 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3359 /* Transfer trailing 1 byte, if any. */
3360 if (unlikely(buflen
& 0x01)) {
3361 u16 align_buf
[1] = { 0 };
3362 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3365 memcpy(align_buf
, trailing_buf
, 1);
3366 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3368 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3369 memcpy(trailing_buf
, align_buf
, 1);
3375 * ata_data_xfer - Transfer data from/to the data register.
3376 * @ap: port to read/write
3378 * @buflen: buffer length
3379 * @do_write: read/write
3381 * Transfer data from/to the device data register.
3384 * Inherited from caller.
3387 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3388 unsigned int buflen
, int do_write
)
3390 /* Make the crap hardware pay the costs not the good stuff */
3391 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3392 unsigned long flags
;
3393 local_irq_save(flags
);
3394 if (ap
->flags
& ATA_FLAG_MMIO
)
3395 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3397 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3398 local_irq_restore(flags
);
3400 if (ap
->flags
& ATA_FLAG_MMIO
)
3401 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3403 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3408 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3409 * @qc: Command on going
3411 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3414 * Inherited from caller.
3417 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3419 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3420 struct scatterlist
*sg
= qc
->__sg
;
3421 struct ata_port
*ap
= qc
->ap
;
3423 unsigned int offset
;
3426 if (qc
->cursect
== (qc
->nsect
- 1))
3427 ap
->hsm_task_state
= HSM_ST_LAST
;
3429 page
= sg
[qc
->cursg
].page
;
3430 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3432 /* get the current page and offset */
3433 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3434 offset
%= PAGE_SIZE
;
3436 buf
= kmap(page
) + offset
;
3441 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3446 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3448 /* do the actual data transfer */
3449 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3450 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3456 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3457 * @qc: Command on going
3458 * @bytes: number of bytes
3460 * Transfer Transfer data from/to the ATAPI device.
3463 * Inherited from caller.
3467 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3469 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3470 struct scatterlist
*sg
= qc
->__sg
;
3471 struct ata_port
*ap
= qc
->ap
;
3474 unsigned int offset
, count
;
3476 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3477 ap
->hsm_task_state
= HSM_ST_LAST
;
3480 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3482 * The end of qc->sg is reached and the device expects
3483 * more data to transfer. In order not to overrun qc->sg
3484 * and fulfill length specified in the byte count register,
3485 * - for read case, discard trailing data from the device
3486 * - for write case, padding zero data to the device
3488 u16 pad_buf
[1] = { 0 };
3489 unsigned int words
= bytes
>> 1;
3492 if (words
) /* warning if bytes > 1 */
3493 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3496 for (i
= 0; i
< words
; i
++)
3497 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3499 ap
->hsm_task_state
= HSM_ST_LAST
;
3503 sg
= &qc
->__sg
[qc
->cursg
];
3506 offset
= sg
->offset
+ qc
->cursg_ofs
;
3508 /* get the current page and offset */
3509 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3510 offset
%= PAGE_SIZE
;
3512 /* don't overrun current sg */
3513 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3515 /* don't cross page boundaries */
3516 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3518 buf
= kmap(page
) + offset
;
3521 qc
->curbytes
+= count
;
3522 qc
->cursg_ofs
+= count
;
3524 if (qc
->cursg_ofs
== sg
->length
) {
3529 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3531 /* do the actual data transfer */
3532 ata_data_xfer(ap
, buf
, count
, do_write
);
3541 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3542 * @qc: Command on going
3544 * Transfer Transfer data from/to the ATAPI device.
3547 * Inherited from caller.
3550 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3552 struct ata_port
*ap
= qc
->ap
;
3553 struct ata_device
*dev
= qc
->dev
;
3554 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3555 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3557 ap
->ops
->tf_read(ap
, &qc
->tf
);
3558 ireason
= qc
->tf
.nsect
;
3559 bc_lo
= qc
->tf
.lbam
;
3560 bc_hi
= qc
->tf
.lbah
;
3561 bytes
= (bc_hi
<< 8) | bc_lo
;
3563 /* shall be cleared to zero, indicating xfer of data */
3564 if (ireason
& (1 << 0))
3567 /* make sure transfer direction matches expected */
3568 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3569 if (do_write
!= i_write
)
3572 __atapi_pio_bytes(qc
, bytes
);
3577 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3578 ap
->id
, dev
->devno
);
3579 qc
->err_mask
|= AC_ERR_HSM
;
3580 ap
->hsm_task_state
= HSM_ST_ERR
;
3584 * ata_pio_block - start PIO on a block
3585 * @ap: the target ata_port
3588 * None. (executing in kernel thread context)
3591 static void ata_pio_block(struct ata_port
*ap
)
3593 struct ata_queued_cmd
*qc
;
3597 * This is purely heuristic. This is a fast path.
3598 * Sometimes when we enter, BSY will be cleared in
3599 * a chk-status or two. If not, the drive is probably seeking
3600 * or something. Snooze for a couple msecs, then
3601 * chk-status again. If still busy, fall back to
3602 * HSM_ST_POLL state.
3604 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3605 if (status
& ATA_BUSY
) {
3607 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3608 if (status
& ATA_BUSY
) {
3609 ap
->hsm_task_state
= HSM_ST_POLL
;
3610 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3615 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3616 WARN_ON(qc
== NULL
);
3619 if (status
& (ATA_ERR
| ATA_DF
)) {
3620 qc
->err_mask
|= AC_ERR_DEV
;
3621 ap
->hsm_task_state
= HSM_ST_ERR
;
3625 /* transfer data if any */
3626 if (is_atapi_taskfile(&qc
->tf
)) {
3627 /* DRQ=0 means no more data to transfer */
3628 if ((status
& ATA_DRQ
) == 0) {
3629 ap
->hsm_task_state
= HSM_ST_LAST
;
3633 atapi_pio_bytes(qc
);
3635 /* handle BSY=0, DRQ=0 as error */
3636 if ((status
& ATA_DRQ
) == 0) {
3637 qc
->err_mask
|= AC_ERR_HSM
;
3638 ap
->hsm_task_state
= HSM_ST_ERR
;
3646 static void ata_pio_error(struct ata_port
*ap
)
3648 struct ata_queued_cmd
*qc
;
3650 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3651 WARN_ON(qc
== NULL
);
3653 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3654 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3656 /* make sure qc->err_mask is available to
3657 * know what's wrong and recover
3659 WARN_ON(qc
->err_mask
== 0);
3661 ap
->hsm_task_state
= HSM_ST_IDLE
;
3663 ata_poll_qc_complete(qc
);
3666 static void ata_pio_task(void *_data
)
3668 struct ata_port
*ap
= _data
;
3669 unsigned long timeout
;
3676 switch (ap
->hsm_task_state
) {
3685 qc_completed
= ata_pio_complete(ap
);
3689 case HSM_ST_LAST_POLL
:
3690 timeout
= ata_pio_poll(ap
);
3700 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3701 else if (!qc_completed
)
3706 * atapi_packet_task - Write CDB bytes to hardware
3707 * @_data: Port to which ATAPI device is attached.
3709 * When device has indicated its readiness to accept
3710 * a CDB, this function is called. Send the CDB.
3711 * If DMA is to be performed, exit immediately.
3712 * Otherwise, we are in polling mode, so poll
3713 * status under operation succeeds or fails.
3716 * Kernel thread context (may sleep)
3719 static void atapi_packet_task(void *_data
)
3721 struct ata_port
*ap
= _data
;
3722 struct ata_queued_cmd
*qc
;
3725 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3726 WARN_ON(qc
== NULL
);
3727 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3729 /* sleep-wait for BSY to clear */
3730 DPRINTK("busy wait\n");
3731 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3732 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3736 /* make sure DRQ is set */
3737 status
= ata_chk_status(ap
);
3738 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3739 qc
->err_mask
|= AC_ERR_HSM
;
3744 DPRINTK("send cdb\n");
3745 WARN_ON(qc
->dev
->cdb_len
< 12);
3747 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3748 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3749 unsigned long flags
;
3751 /* Once we're done issuing command and kicking bmdma,
3752 * irq handler takes over. To not lose irq, we need
3753 * to clear NOINTR flag before sending cdb, but
3754 * interrupt handler shouldn't be invoked before we're
3755 * finished. Hence, the following locking.
3757 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3758 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3759 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3760 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3761 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3762 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3764 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3766 /* PIO commands are handled by polling */
3767 ap
->hsm_task_state
= HSM_ST
;
3768 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3774 ata_poll_qc_complete(qc
);
3778 * ata_qc_timeout - Handle timeout of queued command
3779 * @qc: Command that timed out
3781 * Some part of the kernel (currently, only the SCSI layer)
3782 * has noticed that the active command on port @ap has not
3783 * completed after a specified length of time. Handle this
3784 * condition by disabling DMA (if necessary) and completing
3785 * transactions, with error if necessary.
3787 * This also handles the case of the "lost interrupt", where
3788 * for some reason (possibly hardware bug, possibly driver bug)
3789 * an interrupt was not delivered to the driver, even though the
3790 * transaction completed successfully.
3793 * Inherited from SCSI layer (none, can sleep)
3796 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3798 struct ata_port
*ap
= qc
->ap
;
3799 struct ata_host_set
*host_set
= ap
->host_set
;
3800 u8 host_stat
= 0, drv_stat
;
3801 unsigned long flags
;
3805 ap
->hsm_task_state
= HSM_ST_IDLE
;
3807 spin_lock_irqsave(&host_set
->lock
, flags
);
3809 switch (qc
->tf
.protocol
) {
3812 case ATA_PROT_ATAPI_DMA
:
3813 host_stat
= ap
->ops
->bmdma_status(ap
);
3815 /* before we do anything else, clear DMA-Start bit */
3816 ap
->ops
->bmdma_stop(qc
);
3822 drv_stat
= ata_chk_status(ap
);
3824 /* ack bmdma irq events */
3825 ap
->ops
->irq_clear(ap
);
3827 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3828 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3830 /* complete taskfile transaction */
3831 qc
->err_mask
|= ac_err_mask(drv_stat
);
3835 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3837 ata_eh_qc_complete(qc
);
3843 * ata_eng_timeout - Handle timeout of queued command
3844 * @ap: Port on which timed-out command is active
3846 * Some part of the kernel (currently, only the SCSI layer)
3847 * has noticed that the active command on port @ap has not
3848 * completed after a specified length of time. Handle this
3849 * condition by disabling DMA (if necessary) and completing
3850 * transactions, with error if necessary.
3852 * This also handles the case of the "lost interrupt", where
3853 * for some reason (possibly hardware bug, possibly driver bug)
3854 * an interrupt was not delivered to the driver, even though the
3855 * transaction completed successfully.
3858 * Inherited from SCSI layer (none, can sleep)
3861 void ata_eng_timeout(struct ata_port
*ap
)
3865 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3871 * ata_qc_new - Request an available ATA command, for queueing
3872 * @ap: Port associated with device @dev
3873 * @dev: Device from whom we request an available command structure
3879 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3881 struct ata_queued_cmd
*qc
= NULL
;
3884 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3885 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3886 qc
= ata_qc_from_tag(ap
, i
);
3897 * ata_qc_new_init - Request an available ATA command, and initialize it
3898 * @ap: Port associated with device @dev
3899 * @dev: Device from whom we request an available command structure
3905 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3906 struct ata_device
*dev
)
3908 struct ata_queued_cmd
*qc
;
3910 qc
= ata_qc_new(ap
);
3923 * ata_qc_free - free unused ata_queued_cmd
3924 * @qc: Command to complete
3926 * Designed to free unused ata_queued_cmd object
3927 * in case something prevents using it.
3930 * spin_lock_irqsave(host_set lock)
3932 void ata_qc_free(struct ata_queued_cmd
*qc
)
3934 struct ata_port
*ap
= qc
->ap
;
3937 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3941 if (likely(ata_tag_valid(tag
))) {
3942 if (tag
== ap
->active_tag
)
3943 ap
->active_tag
= ATA_TAG_POISON
;
3944 qc
->tag
= ATA_TAG_POISON
;
3945 clear_bit(tag
, &ap
->qactive
);
3949 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3951 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3952 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3954 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3957 /* atapi: mark qc as inactive to prevent the interrupt handler
3958 * from completing the command twice later, before the error handler
3959 * is called. (when rc != 0 and atapi request sense is needed)
3961 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3963 /* call completion callback */
3964 qc
->complete_fn(qc
);
3967 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3969 struct ata_port
*ap
= qc
->ap
;
3971 switch (qc
->tf
.protocol
) {
3973 case ATA_PROT_ATAPI_DMA
:
3976 case ATA_PROT_ATAPI
:
3978 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3991 * ata_qc_issue - issue taskfile to device
3992 * @qc: command to issue to device
3994 * Prepare an ATA command to submission to device.
3995 * This includes mapping the data into a DMA-able
3996 * area, filling in the S/G table, and finally
3997 * writing the taskfile to hardware, starting the command.
4000 * spin_lock_irqsave(host_set lock)
4002 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4004 struct ata_port
*ap
= qc
->ap
;
4006 qc
->ap
->active_tag
= qc
->tag
;
4007 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4009 if (ata_should_dma_map(qc
)) {
4010 if (qc
->flags
& ATA_QCFLAG_SG
) {
4011 if (ata_sg_setup(qc
))
4013 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4014 if (ata_sg_setup_one(qc
))
4018 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4021 ap
->ops
->qc_prep(qc
);
4023 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4024 if (unlikely(qc
->err_mask
))
4029 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4030 qc
->err_mask
|= AC_ERR_SYSTEM
;
4032 ata_qc_complete(qc
);
4036 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4037 * @qc: command to issue to device
4039 * Using various libata functions and hooks, this function
4040 * starts an ATA command. ATA commands are grouped into
4041 * classes called "protocols", and issuing each type of protocol
4042 * is slightly different.
4044 * May be used as the qc_issue() entry in ata_port_operations.
4047 * spin_lock_irqsave(host_set lock)
4050 * Zero on success, AC_ERR_* mask on failure
4053 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4055 struct ata_port
*ap
= qc
->ap
;
4057 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4059 switch (qc
->tf
.protocol
) {
4060 case ATA_PROT_NODATA
:
4061 ata_tf_to_host(ap
, &qc
->tf
);
4065 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4066 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4067 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4070 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4071 ata_qc_set_polling(qc
);
4072 ata_tf_to_host(ap
, &qc
->tf
);
4073 ap
->hsm_task_state
= HSM_ST
;
4074 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4077 case ATA_PROT_ATAPI
:
4078 ata_qc_set_polling(qc
);
4079 ata_tf_to_host(ap
, &qc
->tf
);
4080 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4083 case ATA_PROT_ATAPI_NODATA
:
4084 ap
->flags
|= ATA_FLAG_NOINTR
;
4085 ata_tf_to_host(ap
, &qc
->tf
);
4086 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4089 case ATA_PROT_ATAPI_DMA
:
4090 ap
->flags
|= ATA_FLAG_NOINTR
;
4091 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4092 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4093 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4098 return AC_ERR_SYSTEM
;
4105 * ata_host_intr - Handle host interrupt for given (port, task)
4106 * @ap: Port on which interrupt arrived (possibly...)
4107 * @qc: Taskfile currently active in engine
4109 * Handle host interrupt for given queued command. Currently,
4110 * only DMA interrupts are handled. All other commands are
4111 * handled via polling with interrupts disabled (nIEN bit).
4114 * spin_lock_irqsave(host_set lock)
4117 * One if interrupt was handled, zero if not (shared irq).
4120 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4121 struct ata_queued_cmd
*qc
)
4123 u8 status
, host_stat
;
4125 switch (qc
->tf
.protocol
) {
4128 case ATA_PROT_ATAPI_DMA
:
4129 case ATA_PROT_ATAPI
:
4130 /* check status of DMA engine */
4131 host_stat
= ap
->ops
->bmdma_status(ap
);
4132 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4134 /* if it's not our irq... */
4135 if (!(host_stat
& ATA_DMA_INTR
))
4138 /* before we do anything else, clear DMA-Start bit */
4139 ap
->ops
->bmdma_stop(qc
);
4143 case ATA_PROT_ATAPI_NODATA
:
4144 case ATA_PROT_NODATA
:
4145 /* check altstatus */
4146 status
= ata_altstatus(ap
);
4147 if (status
& ATA_BUSY
)
4150 /* check main status, clearing INTRQ */
4151 status
= ata_chk_status(ap
);
4152 if (unlikely(status
& ATA_BUSY
))
4154 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4155 ap
->id
, qc
->tf
.protocol
, status
);
4157 /* ack bmdma irq events */
4158 ap
->ops
->irq_clear(ap
);
4160 /* complete taskfile transaction */
4161 qc
->err_mask
|= ac_err_mask(status
);
4162 ata_qc_complete(qc
);
4169 return 1; /* irq handled */
4172 ap
->stats
.idle_irq
++;
4175 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4176 ata_irq_ack(ap
, 0); /* debug trap */
4177 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4181 return 0; /* irq not handled */
4185 * ata_interrupt - Default ATA host interrupt handler
4186 * @irq: irq line (unused)
4187 * @dev_instance: pointer to our ata_host_set information structure
4190 * Default interrupt handler for PCI IDE devices. Calls
4191 * ata_host_intr() for each port that is not disabled.
4194 * Obtains host_set lock during operation.
4197 * IRQ_NONE or IRQ_HANDLED.
4200 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4202 struct ata_host_set
*host_set
= dev_instance
;
4204 unsigned int handled
= 0;
4205 unsigned long flags
;
4207 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4208 spin_lock_irqsave(&host_set
->lock
, flags
);
4210 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4211 struct ata_port
*ap
;
4213 ap
= host_set
->ports
[i
];
4215 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4216 struct ata_queued_cmd
*qc
;
4218 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4219 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4220 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4221 handled
|= ata_host_intr(ap
, qc
);
4225 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4227 return IRQ_RETVAL(handled
);
4232 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4233 * without filling any other registers
4235 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4238 struct ata_taskfile tf
;
4241 ata_tf_init(ap
, &tf
, dev
->devno
);
4244 tf
.flags
|= ATA_TFLAG_DEVICE
;
4245 tf
.protocol
= ATA_PROT_NODATA
;
4247 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4249 printk(KERN_ERR
"%s: ata command failed: %d\n",
4255 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4259 if (!ata_try_flush_cache(dev
))
4262 if (ata_id_has_flush_ext(dev
->id
))
4263 cmd
= ATA_CMD_FLUSH_EXT
;
4265 cmd
= ATA_CMD_FLUSH
;
4267 return ata_do_simple_cmd(ap
, dev
, cmd
);
4270 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4272 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4275 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4277 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4281 * ata_device_resume - wakeup a previously suspended devices
4282 * @ap: port the device is connected to
4283 * @dev: the device to resume
4285 * Kick the drive back into action, by sending it an idle immediate
4286 * command and making sure its transfer mode matches between drive
4290 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4292 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4293 struct ata_device
*failed_dev
;
4294 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4295 while (ata_set_mode(ap
, &failed_dev
))
4296 ata_dev_disable(ap
, failed_dev
);
4298 if (!ata_dev_enabled(dev
))
4300 if (dev
->class == ATA_DEV_ATA
)
4301 ata_start_drive(ap
, dev
);
4307 * ata_device_suspend - prepare a device for suspend
4308 * @ap: port the device is connected to
4309 * @dev: the device to suspend
4311 * Flush the cache on the drive, if appropriate, then issue a
4312 * standbynow command.
4314 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4316 if (!ata_dev_enabled(dev
))
4318 if (dev
->class == ATA_DEV_ATA
)
4319 ata_flush_cache(ap
, dev
);
4321 if (state
.event
!= PM_EVENT_FREEZE
)
4322 ata_standby_drive(ap
, dev
);
4323 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4328 * ata_port_start - Set port up for dma.
4329 * @ap: Port to initialize
4331 * Called just after data structures for each port are
4332 * initialized. Allocates space for PRD table.
4334 * May be used as the port_start() entry in ata_port_operations.
4337 * Inherited from caller.
4340 int ata_port_start (struct ata_port
*ap
)
4342 struct device
*dev
= ap
->dev
;
4345 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4349 rc
= ata_pad_alloc(ap
, dev
);
4351 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4355 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4362 * ata_port_stop - Undo ata_port_start()
4363 * @ap: Port to shut down
4365 * Frees the PRD table.
4367 * May be used as the port_stop() entry in ata_port_operations.
4370 * Inherited from caller.
4373 void ata_port_stop (struct ata_port
*ap
)
4375 struct device
*dev
= ap
->dev
;
4377 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4378 ata_pad_free(ap
, dev
);
4381 void ata_host_stop (struct ata_host_set
*host_set
)
4383 if (host_set
->mmio_base
)
4384 iounmap(host_set
->mmio_base
);
4389 * ata_host_remove - Unregister SCSI host structure with upper layers
4390 * @ap: Port to unregister
4391 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4394 * Inherited from caller.
4397 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4399 struct Scsi_Host
*sh
= ap
->host
;
4404 scsi_remove_host(sh
);
4406 ap
->ops
->port_stop(ap
);
4410 * ata_host_init - Initialize an ata_port structure
4411 * @ap: Structure to initialize
4412 * @host: associated SCSI mid-layer structure
4413 * @host_set: Collection of hosts to which @ap belongs
4414 * @ent: Probe information provided by low-level driver
4415 * @port_no: Port number associated with this ata_port
4417 * Initialize a new ata_port structure, and its associated
4421 * Inherited from caller.
4424 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4425 struct ata_host_set
*host_set
,
4426 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4432 host
->max_channel
= 1;
4433 host
->unique_id
= ata_unique_id
++;
4434 host
->max_cmd_len
= 12;
4436 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4437 ap
->id
= host
->unique_id
;
4439 ap
->ctl
= ATA_DEVCTL_OBS
;
4440 ap
->host_set
= host_set
;
4442 ap
->port_no
= port_no
;
4444 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4445 ap
->pio_mask
= ent
->pio_mask
;
4446 ap
->mwdma_mask
= ent
->mwdma_mask
;
4447 ap
->udma_mask
= ent
->udma_mask
;
4448 ap
->flags
|= ent
->host_flags
;
4449 ap
->ops
= ent
->port_ops
;
4450 ap
->cbl
= ATA_CBL_NONE
;
4451 ap
->active_tag
= ATA_TAG_POISON
;
4452 ap
->last_ctl
= 0xFF;
4454 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4455 INIT_LIST_HEAD(&ap
->eh_done_q
);
4457 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4458 struct ata_device
*dev
= &ap
->device
[i
];
4460 dev
->pio_mask
= UINT_MAX
;
4461 dev
->mwdma_mask
= UINT_MAX
;
4462 dev
->udma_mask
= UINT_MAX
;
4466 ap
->stats
.unhandled_irq
= 1;
4467 ap
->stats
.idle_irq
= 1;
4470 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4474 * ata_host_add - Attach low-level ATA driver to system
4475 * @ent: Information provided by low-level driver
4476 * @host_set: Collections of ports to which we add
4477 * @port_no: Port number associated with this host
4479 * Attach low-level ATA driver to system.
4482 * PCI/etc. bus probe sem.
4485 * New ata_port on success, for NULL on error.
4488 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4489 struct ata_host_set
*host_set
,
4490 unsigned int port_no
)
4492 struct Scsi_Host
*host
;
4493 struct ata_port
*ap
;
4498 if (!ent
->port_ops
->probe_reset
&&
4499 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4500 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4505 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4509 host
->transportt
= &ata_scsi_transport_template
;
4511 ap
= (struct ata_port
*) &host
->hostdata
[0];
4513 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4515 rc
= ap
->ops
->port_start(ap
);
4522 scsi_host_put(host
);
4527 * ata_device_add - Register hardware device with ATA and SCSI layers
4528 * @ent: Probe information describing hardware device to be registered
4530 * This function processes the information provided in the probe
4531 * information struct @ent, allocates the necessary ATA and SCSI
4532 * host information structures, initializes them, and registers
4533 * everything with requisite kernel subsystems.
4535 * This function requests irqs, probes the ATA bus, and probes
4539 * PCI/etc. bus probe sem.
4542 * Number of ports registered. Zero on error (no ports registered).
4545 int ata_device_add(const struct ata_probe_ent
*ent
)
4547 unsigned int count
= 0, i
;
4548 struct device
*dev
= ent
->dev
;
4549 struct ata_host_set
*host_set
;
4552 /* alloc a container for our list of ATA ports (buses) */
4553 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4554 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4557 spin_lock_init(&host_set
->lock
);
4559 host_set
->dev
= dev
;
4560 host_set
->n_ports
= ent
->n_ports
;
4561 host_set
->irq
= ent
->irq
;
4562 host_set
->mmio_base
= ent
->mmio_base
;
4563 host_set
->private_data
= ent
->private_data
;
4564 host_set
->ops
= ent
->port_ops
;
4565 host_set
->flags
= ent
->host_set_flags
;
4567 /* register each port bound to this device */
4568 for (i
= 0; i
< ent
->n_ports
; i
++) {
4569 struct ata_port
*ap
;
4570 unsigned long xfer_mode_mask
;
4572 ap
= ata_host_add(ent
, host_set
, i
);
4576 host_set
->ports
[i
] = ap
;
4577 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4578 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4579 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4581 /* print per-port info to dmesg */
4582 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4583 "bmdma 0x%lX irq %lu\n",
4585 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4586 ata_mode_string(xfer_mode_mask
),
4587 ap
->ioaddr
.cmd_addr
,
4588 ap
->ioaddr
.ctl_addr
,
4589 ap
->ioaddr
.bmdma_addr
,
4593 host_set
->ops
->irq_clear(ap
);
4600 /* obtain irq, that is shared between channels */
4601 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4602 DRV_NAME
, host_set
))
4605 /* perform each probe synchronously */
4606 DPRINTK("probe begin\n");
4607 for (i
= 0; i
< count
; i
++) {
4608 struct ata_port
*ap
;
4611 ap
= host_set
->ports
[i
];
4613 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4614 rc
= ata_bus_probe(ap
);
4615 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4618 /* FIXME: do something useful here?
4619 * Current libata behavior will
4620 * tear down everything when
4621 * the module is removed
4622 * or the h/w is unplugged.
4626 rc
= scsi_add_host(ap
->host
, dev
);
4628 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4630 /* FIXME: do something useful here */
4631 /* FIXME: handle unconditional calls to
4632 * scsi_scan_host and ata_host_remove, below,
4638 /* probes are done, now scan each port's disk(s) */
4639 DPRINTK("host probe begin\n");
4640 for (i
= 0; i
< count
; i
++) {
4641 struct ata_port
*ap
= host_set
->ports
[i
];
4643 ata_scsi_scan_host(ap
);
4646 dev_set_drvdata(dev
, host_set
);
4648 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4649 return ent
->n_ports
; /* success */
4652 for (i
= 0; i
< count
; i
++) {
4653 ata_host_remove(host_set
->ports
[i
], 1);
4654 scsi_host_put(host_set
->ports
[i
]->host
);
4658 VPRINTK("EXIT, returning 0\n");
4663 * ata_host_set_remove - PCI layer callback for device removal
4664 * @host_set: ATA host set that was removed
4666 * Unregister all objects associated with this host set. Free those
4670 * Inherited from calling layer (may sleep).
4673 void ata_host_set_remove(struct ata_host_set
*host_set
)
4675 struct ata_port
*ap
;
4678 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4679 ap
= host_set
->ports
[i
];
4680 scsi_remove_host(ap
->host
);
4683 free_irq(host_set
->irq
, host_set
);
4685 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4686 ap
= host_set
->ports
[i
];
4688 ata_scsi_release(ap
->host
);
4690 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4691 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4693 if (ioaddr
->cmd_addr
== 0x1f0)
4694 release_region(0x1f0, 8);
4695 else if (ioaddr
->cmd_addr
== 0x170)
4696 release_region(0x170, 8);
4699 scsi_host_put(ap
->host
);
4702 if (host_set
->ops
->host_stop
)
4703 host_set
->ops
->host_stop(host_set
);
4709 * ata_scsi_release - SCSI layer callback hook for host unload
4710 * @host: libata host to be unloaded
4712 * Performs all duties necessary to shut down a libata port...
4713 * Kill port kthread, disable port, and release resources.
4716 * Inherited from SCSI layer.
4722 int ata_scsi_release(struct Scsi_Host
*host
)
4724 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4729 ap
->ops
->port_disable(ap
);
4730 ata_host_remove(ap
, 0);
4731 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4732 kfree(ap
->device
[i
].id
);
4739 * ata_std_ports - initialize ioaddr with standard port offsets.
4740 * @ioaddr: IO address structure to be initialized
4742 * Utility function which initializes data_addr, error_addr,
4743 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4744 * device_addr, status_addr, and command_addr to standard offsets
4745 * relative to cmd_addr.
4747 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4750 void ata_std_ports(struct ata_ioports
*ioaddr
)
4752 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4753 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4754 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4755 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4756 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4757 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4758 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4759 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4760 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4761 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4767 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4769 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4771 pci_iounmap(pdev
, host_set
->mmio_base
);
4775 * ata_pci_remove_one - PCI layer callback for device removal
4776 * @pdev: PCI device that was removed
4778 * PCI layer indicates to libata via this hook that
4779 * hot-unplug or module unload event has occurred.
4780 * Handle this by unregistering all objects associated
4781 * with this PCI device. Free those objects. Then finally
4782 * release PCI resources and disable device.
4785 * Inherited from PCI layer (may sleep).
4788 void ata_pci_remove_one (struct pci_dev
*pdev
)
4790 struct device
*dev
= pci_dev_to_dev(pdev
);
4791 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4793 ata_host_set_remove(host_set
);
4794 pci_release_regions(pdev
);
4795 pci_disable_device(pdev
);
4796 dev_set_drvdata(dev
, NULL
);
4799 /* move to PCI subsystem */
4800 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4802 unsigned long tmp
= 0;
4804 switch (bits
->width
) {
4807 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4813 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4819 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4830 return (tmp
== bits
->val
) ? 1 : 0;
4833 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4835 pci_save_state(pdev
);
4836 pci_disable_device(pdev
);
4837 pci_set_power_state(pdev
, PCI_D3hot
);
4841 int ata_pci_device_resume(struct pci_dev
*pdev
)
4843 pci_set_power_state(pdev
, PCI_D0
);
4844 pci_restore_state(pdev
);
4845 pci_enable_device(pdev
);
4846 pci_set_master(pdev
);
4849 #endif /* CONFIG_PCI */
4852 static int __init
ata_init(void)
4854 ata_wq
= create_workqueue("ata");
4858 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4862 static void __exit
ata_exit(void)
4864 destroy_workqueue(ata_wq
);
4867 module_init(ata_init
);
4868 module_exit(ata_exit
);
4870 static unsigned long ratelimit_time
;
4871 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4873 int ata_ratelimit(void)
4876 unsigned long flags
;
4878 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4880 if (time_after(jiffies
, ratelimit_time
)) {
4882 ratelimit_time
= jiffies
+ (HZ
/5);
4886 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4892 * libata is essentially a library of internal helper functions for
4893 * low-level ATA host controller drivers. As such, the API/ABI is
4894 * likely to change as new drivers are added and updated.
4895 * Do not depend on ABI/API stability.
4898 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4899 EXPORT_SYMBOL_GPL(ata_std_ports
);
4900 EXPORT_SYMBOL_GPL(ata_device_add
);
4901 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4902 EXPORT_SYMBOL_GPL(ata_sg_init
);
4903 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4904 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
4905 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4906 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4907 EXPORT_SYMBOL_GPL(ata_tf_load
);
4908 EXPORT_SYMBOL_GPL(ata_tf_read
);
4909 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4910 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4911 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4912 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4913 EXPORT_SYMBOL_GPL(ata_check_status
);
4914 EXPORT_SYMBOL_GPL(ata_altstatus
);
4915 EXPORT_SYMBOL_GPL(ata_exec_command
);
4916 EXPORT_SYMBOL_GPL(ata_port_start
);
4917 EXPORT_SYMBOL_GPL(ata_port_stop
);
4918 EXPORT_SYMBOL_GPL(ata_host_stop
);
4919 EXPORT_SYMBOL_GPL(ata_interrupt
);
4920 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4921 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
4922 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4923 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4924 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4925 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4926 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4927 EXPORT_SYMBOL_GPL(ata_port_probe
);
4928 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4929 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4930 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4931 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4932 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4933 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4934 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4935 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4936 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4937 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
4938 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4939 EXPORT_SYMBOL_GPL(ata_dev_pair
);
4940 EXPORT_SYMBOL_GPL(ata_port_disable
);
4941 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4942 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4943 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
4944 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4945 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4946 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4947 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4948 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4949 EXPORT_SYMBOL_GPL(ata_host_intr
);
4950 EXPORT_SYMBOL_GPL(ata_id_string
);
4951 EXPORT_SYMBOL_GPL(ata_id_c_string
);
4952 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4953 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4954 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4956 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4957 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4958 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4961 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4962 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4963 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4964 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4965 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4966 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4967 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4968 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
4969 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
4970 #endif /* CONFIG_PCI */
4972 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4973 EXPORT_SYMBOL_GPL(ata_device_resume
);
4974 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
4975 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);