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
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
68 struct ata_device
*dev
);
69 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
71 static unsigned int ata_unique_id
= 1;
72 static struct workqueue_struct
*ata_wq
;
74 int atapi_enabled
= 1;
75 module_param(atapi_enabled
, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua
, libata_fua
, int, 0444);
80 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION
);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
103 fis
[0] = 0x27; /* Register - Host to Device FIS */
104 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis
[2] = tf
->command
;
107 fis
[3] = tf
->feature
;
114 fis
[8] = tf
->hob_lbal
;
115 fis
[9] = tf
->hob_lbam
;
116 fis
[10] = tf
->hob_lbah
;
117 fis
[11] = tf
->hob_feature
;
120 fis
[13] = tf
->hob_nsect
;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
143 tf
->command
= fis
[2]; /* status */
144 tf
->feature
= fis
[3]; /* error */
151 tf
->hob_lbal
= fis
[8];
152 tf
->hob_lbam
= fis
[9];
153 tf
->hob_lbah
= fis
[10];
156 tf
->hob_nsect
= fis
[13];
159 static const u8 ata_rw_cmds
[] = {
163 ATA_CMD_READ_MULTI_EXT
,
164 ATA_CMD_WRITE_MULTI_EXT
,
168 ATA_CMD_WRITE_MULTI_FUA_EXT
,
172 ATA_CMD_PIO_READ_EXT
,
173 ATA_CMD_PIO_WRITE_EXT
,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
201 struct ata_taskfile
*tf
= &qc
->tf
;
202 struct ata_device
*dev
= qc
->dev
;
205 int index
, fua
, lba48
, write
;
207 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
208 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
209 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
211 if (dev
->flags
& ATA_DFLAG_PIO
) {
212 tf
->protocol
= ATA_PROT_PIO
;
213 index
= dev
->multi_count
? 0 : 8;
214 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
215 /* Unable to use DMA due to host limitation */
216 tf
->protocol
= ATA_PROT_PIO
;
217 index
= dev
->multi_count
? 0 : 8;
219 tf
->protocol
= ATA_PROT_DMA
;
223 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
247 unsigned int mwdma_mask
,
248 unsigned int udma_mask
)
250 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
251 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
252 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
256 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
257 * @xfer_mask: xfer_mask to unpack
258 * @pio_mask: resulting pio_mask
259 * @mwdma_mask: resulting mwdma_mask
260 * @udma_mask: resulting udma_mask
262 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
263 * Any NULL distination masks will be ignored.
265 static void ata_unpack_xfermask(unsigned int xfer_mask
,
266 unsigned int *pio_mask
,
267 unsigned int *mwdma_mask
,
268 unsigned int *udma_mask
)
271 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
273 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
275 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
278 static const struct ata_xfer_ent
{
279 unsigned int shift
, bits
;
282 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
283 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
284 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
289 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
290 * @xfer_mask: xfer_mask of interest
292 * Return matching XFER_* value for @xfer_mask. Only the highest
293 * bit of @xfer_mask is considered.
299 * Matching XFER_* value, 0 if no match found.
301 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
303 int highbit
= fls(xfer_mask
) - 1;
304 const struct ata_xfer_ent
*ent
;
306 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
307 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
308 return ent
->base
+ highbit
- ent
->shift
;
313 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
314 * @xfer_mode: XFER_* of interest
316 * Return matching xfer_mask for @xfer_mode.
322 * Matching xfer_mask, 0 if no match found.
324 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
326 const struct ata_xfer_ent
*ent
;
328 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
329 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
330 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
335 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
336 * @xfer_mode: XFER_* of interest
338 * Return matching xfer_shift for @xfer_mode.
344 * Matching xfer_shift, -1 if no match found.
346 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
348 const struct ata_xfer_ent
*ent
;
350 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
351 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
357 * ata_mode_string - convert xfer_mask to string
358 * @xfer_mask: mask of bits supported; only highest bit counts.
360 * Determine string which represents the highest speed
361 * (highest bit in @modemask).
367 * Constant C string representing highest speed listed in
368 * @mode_mask, or the constant C string "<n/a>".
370 static const char *ata_mode_string(unsigned int xfer_mask
)
372 static const char * const xfer_mode_str
[] = {
392 highbit
= fls(xfer_mask
) - 1;
393 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
394 return xfer_mode_str
[highbit
];
398 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
400 if (ata_dev_present(dev
)) {
401 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
408 * ata_pio_devchk - PATA device presence detection
409 * @ap: ATA channel to examine
410 * @device: Device to examine (starting at zero)
412 * This technique was originally described in
413 * Hale Landis's ATADRVR (www.ata-atapi.com), and
414 * later found its way into the ATA/ATAPI spec.
416 * Write a pattern to the ATA shadow registers,
417 * and if a device is present, it will respond by
418 * correctly storing and echoing back the
419 * ATA shadow register contents.
425 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
428 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
431 ap
->ops
->dev_select(ap
, device
);
433 outb(0x55, ioaddr
->nsect_addr
);
434 outb(0xaa, ioaddr
->lbal_addr
);
436 outb(0xaa, ioaddr
->nsect_addr
);
437 outb(0x55, ioaddr
->lbal_addr
);
439 outb(0x55, ioaddr
->nsect_addr
);
440 outb(0xaa, ioaddr
->lbal_addr
);
442 nsect
= inb(ioaddr
->nsect_addr
);
443 lbal
= inb(ioaddr
->lbal_addr
);
445 if ((nsect
== 0x55) && (lbal
== 0xaa))
446 return 1; /* we found a device */
448 return 0; /* nothing found */
452 * ata_mmio_devchk - PATA device presence detection
453 * @ap: ATA channel to examine
454 * @device: Device to examine (starting at zero)
456 * This technique was originally described in
457 * Hale Landis's ATADRVR (www.ata-atapi.com), and
458 * later found its way into the ATA/ATAPI spec.
460 * Write a pattern to the ATA shadow registers,
461 * and if a device is present, it will respond by
462 * correctly storing and echoing back the
463 * ATA shadow register contents.
469 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
472 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
475 ap
->ops
->dev_select(ap
, device
);
477 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
478 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
480 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
481 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
483 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
484 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
486 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
487 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
489 if ((nsect
== 0x55) && (lbal
== 0xaa))
490 return 1; /* we found a device */
492 return 0; /* nothing found */
496 * ata_devchk - PATA device presence detection
497 * @ap: ATA channel to examine
498 * @device: Device to examine (starting at zero)
500 * Dispatch ATA device presence detection, depending
501 * on whether we are using PIO or MMIO to talk to the
502 * ATA shadow registers.
508 static unsigned int ata_devchk(struct ata_port
*ap
,
511 if (ap
->flags
& ATA_FLAG_MMIO
)
512 return ata_mmio_devchk(ap
, device
);
513 return ata_pio_devchk(ap
, device
);
517 * ata_dev_classify - determine device type based on ATA-spec signature
518 * @tf: ATA taskfile register set for device to be identified
520 * Determine from taskfile register contents whether a device is
521 * ATA or ATAPI, as per "Signature and persistence" section
522 * of ATA/PI spec (volume 1, sect 5.14).
528 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
529 * the event of failure.
532 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
534 /* Apple's open source Darwin code hints that some devices only
535 * put a proper signature into the LBA mid/high registers,
536 * So, we only check those. It's sufficient for uniqueness.
539 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
540 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
541 DPRINTK("found ATA device by sig\n");
545 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
546 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
547 DPRINTK("found ATAPI device by sig\n");
548 return ATA_DEV_ATAPI
;
551 DPRINTK("unknown device\n");
552 return ATA_DEV_UNKNOWN
;
556 * ata_dev_try_classify - Parse returned ATA device signature
557 * @ap: ATA channel to examine
558 * @device: Device to examine (starting at zero)
559 * @r_err: Value of error register on completion
561 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
562 * an ATA/ATAPI-defined set of values is placed in the ATA
563 * shadow registers, indicating the results of device detection
566 * Select the ATA device, and read the values from the ATA shadow
567 * registers. Then parse according to the Error register value,
568 * and the spec-defined values examined by ata_dev_classify().
574 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
578 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
580 struct ata_taskfile tf
;
584 ap
->ops
->dev_select(ap
, device
);
586 memset(&tf
, 0, sizeof(tf
));
588 ap
->ops
->tf_read(ap
, &tf
);
593 /* see if device passed diags */
596 else if ((device
== 0) && (err
== 0x81))
601 /* determine if device is ATA or ATAPI */
602 class = ata_dev_classify(&tf
);
604 if (class == ATA_DEV_UNKNOWN
)
606 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
612 * ata_id_string - Convert IDENTIFY DEVICE page into string
613 * @id: IDENTIFY DEVICE results we will examine
614 * @s: string into which data is output
615 * @ofs: offset into identify device page
616 * @len: length of string to return. must be an even number.
618 * The strings in the IDENTIFY DEVICE page are broken up into
619 * 16-bit chunks. Run through the string, and output each
620 * 8-bit chunk linearly, regardless of platform.
626 void ata_id_string(const u16
*id
, unsigned char *s
,
627 unsigned int ofs
, unsigned int len
)
646 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
647 * @id: IDENTIFY DEVICE results we will examine
648 * @s: string into which data is output
649 * @ofs: offset into identify device page
650 * @len: length of string to return. must be an odd number.
652 * This function is identical to ata_id_string except that it
653 * trims trailing spaces and terminates the resulting string with
654 * null. @len must be actual maximum length (even number) + 1.
659 void ata_id_c_string(const u16
*id
, unsigned char *s
,
660 unsigned int ofs
, unsigned int len
)
666 ata_id_string(id
, s
, ofs
, len
- 1);
668 p
= s
+ strnlen(s
, len
- 1);
669 while (p
> s
&& p
[-1] == ' ')
674 static u64
ata_id_n_sectors(const u16
*id
)
676 if (ata_id_has_lba(id
)) {
677 if (ata_id_has_lba48(id
))
678 return ata_id_u64(id
, 100);
680 return ata_id_u32(id
, 60);
682 if (ata_id_current_chs_valid(id
))
683 return ata_id_u32(id
, 57);
685 return id
[1] * id
[3] * id
[6];
690 * ata_noop_dev_select - Select device 0/1 on ATA bus
691 * @ap: ATA channel to manipulate
692 * @device: ATA device (numbered from zero) to select
694 * This function performs no actual function.
696 * May be used as the dev_select() entry in ata_port_operations.
701 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
707 * ata_std_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * Use the method defined in the ATA specification to
712 * make either device 0, or device 1, active on the
713 * ATA channel. Works with both PIO and MMIO.
715 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
726 tmp
= ATA_DEVICE_OBS
;
728 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
730 if (ap
->flags
& ATA_FLAG_MMIO
) {
731 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
733 outb(tmp
, ap
->ioaddr
.device_addr
);
735 ata_pause(ap
); /* needed; also flushes, for mmio */
739 * ata_dev_select - Select device 0/1 on ATA bus
740 * @ap: ATA channel to manipulate
741 * @device: ATA device (numbered from zero) to select
742 * @wait: non-zero to wait for Status register BSY bit to clear
743 * @can_sleep: non-zero if context allows sleeping
745 * Use the method defined in the ATA specification to
746 * make either device 0, or device 1, active on the
749 * This is a high-level version of ata_std_dev_select(),
750 * which additionally provides the services of inserting
751 * the proper pauses and status polling, where needed.
757 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
758 unsigned int wait
, unsigned int can_sleep
)
760 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
761 ap
->id
, device
, wait
);
766 ap
->ops
->dev_select(ap
, device
);
769 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
776 * ata_dump_id - IDENTIFY DEVICE info debugging output
777 * @id: IDENTIFY DEVICE page to dump
779 * Dump selected 16-bit words from the given IDENTIFY DEVICE
786 static inline void ata_dump_id(const u16
*id
)
788 DPRINTK("49==0x%04x "
798 DPRINTK("80==0x%04x "
808 DPRINTK("88==0x%04x "
815 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
816 * @id: IDENTIFY data to compute xfer mask from
818 * Compute the xfermask for this device. This is not as trivial
819 * as it seems if we must consider early devices correctly.
821 * FIXME: pre IDE drive timing (do we care ?).
829 static unsigned int ata_id_xfermask(const u16
*id
)
831 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
833 /* Usual case. Word 53 indicates word 64 is valid */
834 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
835 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
839 /* If word 64 isn't valid then Word 51 high byte holds
840 * the PIO timing number for the maximum. Turn it into
843 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
845 /* But wait.. there's more. Design your standards by
846 * committee and you too can get a free iordy field to
847 * process. However its the speeds not the modes that
848 * are supported... Note drivers using the timing API
849 * will get this right anyway
853 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
856 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
857 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
859 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
863 * ata_port_queue_task - Queue port_task
864 * @ap: The ata_port to queue port_task for
866 * Schedule @fn(@data) for execution after @delay jiffies using
867 * port_task. There is one port_task per port and it's the
868 * user(low level driver)'s responsibility to make sure that only
869 * one task is active at any given time.
871 * libata core layer takes care of synchronization between
872 * port_task and EH. ata_port_queue_task() may be ignored for EH
876 * Inherited from caller.
878 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
883 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
886 PREPARE_WORK(&ap
->port_task
, fn
, data
);
889 rc
= queue_work(ata_wq
, &ap
->port_task
);
891 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
893 /* rc == 0 means that another user is using port task */
898 * ata_port_flush_task - Flush port_task
899 * @ap: The ata_port to flush port_task for
901 * After this function completes, port_task is guranteed not to
902 * be running or scheduled.
905 * Kernel thread context (may sleep)
907 void ata_port_flush_task(struct ata_port
*ap
)
913 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
914 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
915 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
917 DPRINTK("flush #1\n");
918 flush_workqueue(ata_wq
);
921 * At this point, if a task is running, it's guaranteed to see
922 * the FLUSH flag; thus, it will never queue pio tasks again.
925 if (!cancel_delayed_work(&ap
->port_task
)) {
926 DPRINTK("flush #2\n");
927 flush_workqueue(ata_wq
);
930 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
931 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
932 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
937 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
939 struct completion
*waiting
= qc
->private_data
;
941 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
946 * ata_exec_internal - execute libata internal command
947 * @ap: Port to which the command is sent
948 * @dev: Device to which the command is sent
949 * @tf: Taskfile registers for the command and the result
950 * @dma_dir: Data tranfer direction of the command
951 * @buf: Data buffer of the command
952 * @buflen: Length of data buffer
954 * Executes libata internal command with timeout. @tf contains
955 * command on entry and result on return. Timeout and error
956 * conditions are reported via return value. No recovery action
957 * is taken after a command times out. It's caller's duty to
958 * clean up after timeout.
961 * None. Should be called with kernel context, might sleep.
965 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
966 struct ata_taskfile
*tf
,
967 int dma_dir
, void *buf
, unsigned int buflen
)
969 u8 command
= tf
->command
;
970 struct ata_queued_cmd
*qc
;
971 DECLARE_COMPLETION(wait
);
973 unsigned int err_mask
;
975 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
977 qc
= ata_qc_new_init(ap
, dev
);
981 qc
->dma_dir
= dma_dir
;
982 if (dma_dir
!= DMA_NONE
) {
983 ata_sg_init_one(qc
, buf
, buflen
);
984 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
987 qc
->private_data
= &wait
;
988 qc
->complete_fn
= ata_qc_complete_internal
;
990 qc
->err_mask
= ata_qc_issue(qc
);
994 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
996 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
997 ata_port_flush_task(ap
);
999 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1001 /* We're racing with irq here. If we lose, the
1002 * following test prevents us from completing the qc
1003 * again. If completion irq occurs after here but
1004 * before the caller cleans up, it will result in a
1005 * spurious interrupt. We can live with that.
1007 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1008 qc
->err_mask
= AC_ERR_TIMEOUT
;
1009 ata_qc_complete(qc
);
1010 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1014 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1018 err_mask
= qc
->err_mask
;
1022 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1023 * Until those drivers are fixed, we detect the condition
1024 * here, fail the command with AC_ERR_SYSTEM and reenable the
1027 * Note that this doesn't change any behavior as internal
1028 * command failure results in disabling the device in the
1029 * higher layer for LLDDs without new reset/EH callbacks.
1031 * Kill the following code as soon as those drivers are fixed.
1033 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1034 err_mask
|= AC_ERR_SYSTEM
;
1042 * ata_pio_need_iordy - check if iordy needed
1045 * Check if the current speed of the device requires IORDY. Used
1046 * by various controllers for chip configuration.
1049 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1052 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1059 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1061 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1062 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1063 /* Is the speed faster than the drive allows non IORDY ? */
1065 /* This is cycle times not frequency - watch the logic! */
1066 if (pio
> 240) /* PIO2 is 240nS per cycle */
1075 * ata_dev_read_id - Read ID data from the specified device
1076 * @ap: port on which target device resides
1077 * @dev: target device
1078 * @p_class: pointer to class of the target device (may be changed)
1079 * @post_reset: is this read ID post-reset?
1080 * @p_id: read IDENTIFY page (newly allocated)
1082 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1083 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1084 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1085 * for pre-ATA4 drives.
1088 * Kernel thread context (may sleep)
1091 * 0 on success, -errno otherwise.
1093 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1094 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1096 unsigned int class = *p_class
;
1097 struct ata_taskfile tf
;
1098 unsigned int err_mask
= 0;
1103 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1105 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1107 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1110 reason
= "out of memory";
1115 ata_tf_init(ap
, &tf
, dev
->devno
);
1119 tf
.command
= ATA_CMD_ID_ATA
;
1122 tf
.command
= ATA_CMD_ID_ATAPI
;
1126 reason
= "unsupported class";
1130 tf
.protocol
= ATA_PROT_PIO
;
1132 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1133 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1136 reason
= "I/O error";
1140 swap_buf_le16(id
, ATA_ID_WORDS
);
1143 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1145 reason
= "device reports illegal type";
1149 if (post_reset
&& class == ATA_DEV_ATA
) {
1151 * The exact sequence expected by certain pre-ATA4 drives is:
1154 * INITIALIZE DEVICE PARAMETERS
1156 * Some drives were very specific about that exact sequence.
1158 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1159 err_mask
= ata_dev_init_params(ap
, dev
);
1162 reason
= "INIT_DEV_PARAMS failed";
1166 /* current CHS translation info (id[53-58]) might be
1167 * changed. reread the identify device info.
1179 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1180 ap
->id
, dev
->devno
, reason
);
1185 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1186 struct ata_device
*dev
)
1188 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1192 * ata_dev_configure - Configure the specified ATA/ATAPI device
1193 * @ap: Port on which target device resides
1194 * @dev: Target device to configure
1195 * @print_info: Enable device info printout
1197 * Configure @dev according to @dev->id. Generic and low-level
1198 * driver specific fixups are also applied.
1201 * Kernel thread context (may sleep)
1204 * 0 on success, -errno otherwise
1206 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1209 const u16
*id
= dev
->id
;
1210 unsigned int xfer_mask
;
1213 if (!ata_dev_present(dev
)) {
1214 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1215 ap
->id
, dev
->devno
);
1219 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1221 /* print device capabilities */
1223 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1224 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1225 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1226 id
[84], id
[85], id
[86], id
[87], id
[88]);
1228 /* initialize to-be-configured parameters */
1230 dev
->max_sectors
= 0;
1238 * common ATA, ATAPI feature tests
1241 /* find max transfer mode; for printk only */
1242 xfer_mask
= ata_id_xfermask(id
);
1246 /* ATA-specific feature tests */
1247 if (dev
->class == ATA_DEV_ATA
) {
1248 dev
->n_sectors
= ata_id_n_sectors(id
);
1250 if (ata_id_has_lba(id
)) {
1251 const char *lba_desc
;
1254 dev
->flags
|= ATA_DFLAG_LBA
;
1255 if (ata_id_has_lba48(id
)) {
1256 dev
->flags
|= ATA_DFLAG_LBA48
;
1260 /* print device info to dmesg */
1262 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1263 "max %s, %Lu sectors: %s\n",
1265 ata_id_major_version(id
),
1266 ata_mode_string(xfer_mask
),
1267 (unsigned long long)dev
->n_sectors
,
1272 /* Default translation */
1273 dev
->cylinders
= id
[1];
1275 dev
->sectors
= id
[6];
1277 if (ata_id_current_chs_valid(id
)) {
1278 /* Current CHS translation is valid. */
1279 dev
->cylinders
= id
[54];
1280 dev
->heads
= id
[55];
1281 dev
->sectors
= id
[56];
1284 /* print device info to dmesg */
1286 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1287 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1289 ata_id_major_version(id
),
1290 ata_mode_string(xfer_mask
),
1291 (unsigned long long)dev
->n_sectors
,
1292 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1298 /* ATAPI-specific feature tests */
1299 else if (dev
->class == ATA_DEV_ATAPI
) {
1300 rc
= atapi_cdb_len(id
);
1301 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1302 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1306 dev
->cdb_len
= (unsigned int) rc
;
1308 /* print device info to dmesg */
1310 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1311 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1314 ap
->host
->max_cmd_len
= 0;
1315 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1316 ap
->host
->max_cmd_len
= max_t(unsigned int,
1317 ap
->host
->max_cmd_len
,
1318 ap
->device
[i
].cdb_len
);
1320 /* limit bridge transfers to udma5, 200 sectors */
1321 if (ata_dev_knobble(ap
, dev
)) {
1323 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1324 ap
->id
, dev
->devno
);
1325 dev
->udma_mask
&= ATA_UDMA5
;
1326 dev
->max_sectors
= ATA_MAX_SECTORS
;
1329 if (ap
->ops
->dev_config
)
1330 ap
->ops
->dev_config(ap
, dev
);
1332 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1336 DPRINTK("EXIT, err\n");
1341 * ata_bus_probe - Reset and probe ATA bus
1344 * Master ATA bus probing function. Initiates a hardware-dependent
1345 * bus reset, then attempts to identify any devices found on
1349 * PCI/etc. bus probe sem.
1352 * Zero on success, non-zero on error.
1355 static int ata_bus_probe(struct ata_port
*ap
)
1357 unsigned int classes
[ATA_MAX_DEVICES
];
1358 unsigned int i
, rc
, found
= 0;
1362 /* reset and determine device classes */
1363 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1364 classes
[i
] = ATA_DEV_UNKNOWN
;
1366 if (ap
->ops
->probe_reset
) {
1367 rc
= ap
->ops
->probe_reset(ap
, classes
);
1369 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1373 ap
->ops
->phy_reset(ap
);
1375 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1376 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1377 classes
[i
] = ap
->device
[i
].class;
1382 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1383 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1384 classes
[i
] = ATA_DEV_NONE
;
1386 /* read IDENTIFY page and configure devices */
1387 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1388 struct ata_device
*dev
= &ap
->device
[i
];
1390 dev
->class = classes
[i
];
1392 if (!ata_dev_present(dev
))
1395 WARN_ON(dev
->id
!= NULL
);
1396 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1397 dev
->class = ATA_DEV_NONE
;
1401 if (ata_dev_configure(ap
, dev
, 1)) {
1402 ata_dev_disable(ap
, dev
);
1410 goto err_out_disable
;
1413 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1414 goto err_out_disable
;
1419 ap
->ops
->port_disable(ap
);
1424 * ata_port_probe - Mark port as enabled
1425 * @ap: Port for which we indicate enablement
1427 * Modify @ap data structure such that the system
1428 * thinks that the entire port is enabled.
1430 * LOCKING: host_set lock, or some other form of
1434 void ata_port_probe(struct ata_port
*ap
)
1436 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1440 * sata_print_link_status - Print SATA link status
1441 * @ap: SATA port to printk link status about
1443 * This function prints link speed and status of a SATA link.
1448 static void sata_print_link_status(struct ata_port
*ap
)
1453 if (!ap
->ops
->scr_read
)
1456 sstatus
= scr_read(ap
, SCR_STATUS
);
1458 if (sata_dev_present(ap
)) {
1459 tmp
= (sstatus
>> 4) & 0xf;
1462 else if (tmp
& (1 << 1))
1465 speed
= "<unknown>";
1466 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1467 ap
->id
, speed
, sstatus
);
1469 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1475 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1476 * @ap: SATA port associated with target SATA PHY.
1478 * This function issues commands to standard SATA Sxxx
1479 * PHY registers, to wake up the phy (and device), and
1480 * clear any reset condition.
1483 * PCI/etc. bus probe sem.
1486 void __sata_phy_reset(struct ata_port
*ap
)
1489 unsigned long timeout
= jiffies
+ (HZ
* 5);
1491 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1492 /* issue phy wake/reset */
1493 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1494 /* Couldn't find anything in SATA I/II specs, but
1495 * AHCI-1.1 10.4.2 says at least 1 ms. */
1498 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1500 /* wait for phy to become ready, if necessary */
1503 sstatus
= scr_read(ap
, SCR_STATUS
);
1504 if ((sstatus
& 0xf) != 1)
1506 } while (time_before(jiffies
, timeout
));
1508 /* print link status */
1509 sata_print_link_status(ap
);
1511 /* TODO: phy layer with polling, timeouts, etc. */
1512 if (sata_dev_present(ap
))
1515 ata_port_disable(ap
);
1517 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1520 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1521 ata_port_disable(ap
);
1525 ap
->cbl
= ATA_CBL_SATA
;
1529 * sata_phy_reset - Reset SATA bus.
1530 * @ap: SATA port associated with target SATA PHY.
1532 * This function resets the SATA bus, and then probes
1533 * the bus for devices.
1536 * PCI/etc. bus probe sem.
1539 void sata_phy_reset(struct ata_port
*ap
)
1541 __sata_phy_reset(ap
);
1542 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1548 * ata_dev_pair - return other device on cable
1552 * Obtain the other device on the same cable, or if none is
1553 * present NULL is returned
1556 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1558 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1559 if (!ata_dev_present(pair
))
1565 * ata_port_disable - Disable port.
1566 * @ap: Port to be disabled.
1568 * Modify @ap data structure such that the system
1569 * thinks that the entire port is disabled, and should
1570 * never attempt to probe or communicate with devices
1573 * LOCKING: host_set lock, or some other form of
1577 void ata_port_disable(struct ata_port
*ap
)
1579 ap
->device
[0].class = ATA_DEV_NONE
;
1580 ap
->device
[1].class = ATA_DEV_NONE
;
1581 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1585 * This mode timing computation functionality is ported over from
1586 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1589 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1590 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1591 * for PIO 5, which is a nonstandard extension and UDMA6, which
1592 * is currently supported only by Maxtor drives.
1595 static const struct ata_timing ata_timing
[] = {
1597 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1598 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1599 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1600 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1602 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1603 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1604 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1606 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1608 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1609 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1610 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1612 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1613 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1614 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1616 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1617 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1618 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1620 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1621 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1622 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1624 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1629 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1630 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1632 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1634 q
->setup
= EZ(t
->setup
* 1000, T
);
1635 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1636 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1637 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1638 q
->active
= EZ(t
->active
* 1000, T
);
1639 q
->recover
= EZ(t
->recover
* 1000, T
);
1640 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1641 q
->udma
= EZ(t
->udma
* 1000, UT
);
1644 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1645 struct ata_timing
*m
, unsigned int what
)
1647 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1648 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1649 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1650 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1651 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1652 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1653 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1654 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1657 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1659 const struct ata_timing
*t
;
1661 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1662 if (t
->mode
== 0xFF)
1667 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1668 struct ata_timing
*t
, int T
, int UT
)
1670 const struct ata_timing
*s
;
1671 struct ata_timing p
;
1677 if (!(s
= ata_timing_find_mode(speed
)))
1680 memcpy(t
, s
, sizeof(*s
));
1683 * If the drive is an EIDE drive, it can tell us it needs extended
1684 * PIO/MW_DMA cycle timing.
1687 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1688 memset(&p
, 0, sizeof(p
));
1689 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1690 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1691 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1692 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1693 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1695 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1699 * Convert the timing to bus clock counts.
1702 ata_timing_quantize(t
, t
, T
, UT
);
1705 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1706 * S.M.A.R.T * and some other commands. We have to ensure that the
1707 * DMA cycle timing is slower/equal than the fastest PIO timing.
1710 if (speed
> XFER_PIO_4
) {
1711 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1712 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1716 * Lengthen active & recovery time so that cycle time is correct.
1719 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1720 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1721 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1724 if (t
->active
+ t
->recover
< t
->cycle
) {
1725 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1726 t
->recover
= t
->cycle
- t
->active
;
1732 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1734 unsigned int err_mask
;
1737 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1738 dev
->flags
|= ATA_DFLAG_PIO
;
1740 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1743 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1748 rc
= ata_dev_revalidate(ap
, dev
, 0);
1751 "ata%u: failed to revalidate after set xfermode\n",
1756 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1757 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1759 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1761 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1765 static int ata_host_set_pio(struct ata_port
*ap
)
1769 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1770 struct ata_device
*dev
= &ap
->device
[i
];
1772 if (!ata_dev_present(dev
))
1775 if (!dev
->pio_mode
) {
1776 printk(KERN_WARNING
"ata%u: no PIO support for device %d.\n", ap
->id
, i
);
1780 dev
->xfer_mode
= dev
->pio_mode
;
1781 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1782 if (ap
->ops
->set_piomode
)
1783 ap
->ops
->set_piomode(ap
, dev
);
1789 static void ata_host_set_dma(struct ata_port
*ap
)
1793 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1794 struct ata_device
*dev
= &ap
->device
[i
];
1796 if (!ata_dev_present(dev
) || !dev
->dma_mode
)
1799 dev
->xfer_mode
= dev
->dma_mode
;
1800 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1801 if (ap
->ops
->set_dmamode
)
1802 ap
->ops
->set_dmamode(ap
, dev
);
1807 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1808 * @ap: port on which timings will be programmed
1810 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1813 * PCI/etc. bus probe sem.
1815 static void ata_set_mode(struct ata_port
*ap
)
1819 /* step 1: calculate xfer_mask */
1820 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1821 struct ata_device
*dev
= &ap
->device
[i
];
1822 unsigned int pio_mask
, dma_mask
;
1824 if (!ata_dev_present(dev
))
1827 ata_dev_xfermask(ap
, dev
);
1829 /* TODO: let LLDD filter dev->*_mask here */
1831 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
1832 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
1833 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
1834 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
1837 /* step 2: always set host PIO timings */
1838 rc
= ata_host_set_pio(ap
);
1842 /* step 3: set host DMA timings */
1843 ata_host_set_dma(ap
);
1845 /* step 4: update devices' xfer mode */
1846 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1847 struct ata_device
*dev
= &ap
->device
[i
];
1849 if (!ata_dev_present(dev
))
1852 if (ata_dev_set_mode(ap
, dev
))
1856 if (ap
->ops
->post_set_mode
)
1857 ap
->ops
->post_set_mode(ap
);
1862 ata_port_disable(ap
);
1866 * ata_tf_to_host - issue ATA taskfile to host controller
1867 * @ap: port to which command is being issued
1868 * @tf: ATA taskfile register set
1870 * Issues ATA taskfile register set to ATA host controller,
1871 * with proper synchronization with interrupt handler and
1875 * spin_lock_irqsave(host_set lock)
1878 static inline void ata_tf_to_host(struct ata_port
*ap
,
1879 const struct ata_taskfile
*tf
)
1881 ap
->ops
->tf_load(ap
, tf
);
1882 ap
->ops
->exec_command(ap
, tf
);
1886 * ata_busy_sleep - sleep until BSY clears, or timeout
1887 * @ap: port containing status register to be polled
1888 * @tmout_pat: impatience timeout
1889 * @tmout: overall timeout
1891 * Sleep until ATA Status register bit BSY clears,
1892 * or a timeout occurs.
1897 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1898 unsigned long tmout_pat
, unsigned long tmout
)
1900 unsigned long timer_start
, timeout
;
1903 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1904 timer_start
= jiffies
;
1905 timeout
= timer_start
+ tmout_pat
;
1906 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1908 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1911 if (status
& ATA_BUSY
)
1912 printk(KERN_WARNING
"ata%u is slow to respond, "
1913 "please be patient\n", ap
->id
);
1915 timeout
= timer_start
+ tmout
;
1916 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1918 status
= ata_chk_status(ap
);
1921 if (status
& ATA_BUSY
) {
1922 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1923 ap
->id
, tmout
/ HZ
);
1930 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1932 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1933 unsigned int dev0
= devmask
& (1 << 0);
1934 unsigned int dev1
= devmask
& (1 << 1);
1935 unsigned long timeout
;
1937 /* if device 0 was found in ata_devchk, wait for its
1941 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1943 /* if device 1 was found in ata_devchk, wait for
1944 * register access, then wait for BSY to clear
1946 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1950 ap
->ops
->dev_select(ap
, 1);
1951 if (ap
->flags
& ATA_FLAG_MMIO
) {
1952 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1953 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1955 nsect
= inb(ioaddr
->nsect_addr
);
1956 lbal
= inb(ioaddr
->lbal_addr
);
1958 if ((nsect
== 1) && (lbal
== 1))
1960 if (time_after(jiffies
, timeout
)) {
1964 msleep(50); /* give drive a breather */
1967 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1969 /* is all this really necessary? */
1970 ap
->ops
->dev_select(ap
, 0);
1972 ap
->ops
->dev_select(ap
, 1);
1974 ap
->ops
->dev_select(ap
, 0);
1977 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1978 unsigned int devmask
)
1980 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1982 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1984 /* software reset. causes dev0 to be selected */
1985 if (ap
->flags
& ATA_FLAG_MMIO
) {
1986 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1987 udelay(20); /* FIXME: flush */
1988 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1989 udelay(20); /* FIXME: flush */
1990 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1992 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1994 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1996 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1999 /* spec mandates ">= 2ms" before checking status.
2000 * We wait 150ms, because that was the magic delay used for
2001 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2002 * between when the ATA command register is written, and then
2003 * status is checked. Because waiting for "a while" before
2004 * checking status is fine, post SRST, we perform this magic
2005 * delay here as well.
2007 * Old drivers/ide uses the 2mS rule and then waits for ready
2011 /* Before we perform post reset processing we want to see if
2012 * the bus shows 0xFF because the odd clown forgets the D7
2013 * pulldown resistor.
2015 if (ata_check_status(ap
) == 0xFF)
2016 return AC_ERR_OTHER
;
2018 ata_bus_post_reset(ap
, devmask
);
2024 * ata_bus_reset - reset host port and associated ATA channel
2025 * @ap: port to reset
2027 * This is typically the first time we actually start issuing
2028 * commands to the ATA channel. We wait for BSY to clear, then
2029 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2030 * result. Determine what devices, if any, are on the channel
2031 * by looking at the device 0/1 error register. Look at the signature
2032 * stored in each device's taskfile registers, to determine if
2033 * the device is ATA or ATAPI.
2036 * PCI/etc. bus probe sem.
2037 * Obtains host_set lock.
2040 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2043 void ata_bus_reset(struct ata_port
*ap
)
2045 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2046 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2048 unsigned int dev0
, dev1
= 0, devmask
= 0;
2050 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2052 /* determine if device 0/1 are present */
2053 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2056 dev0
= ata_devchk(ap
, 0);
2058 dev1
= ata_devchk(ap
, 1);
2062 devmask
|= (1 << 0);
2064 devmask
|= (1 << 1);
2066 /* select device 0 again */
2067 ap
->ops
->dev_select(ap
, 0);
2069 /* issue bus reset */
2070 if (ap
->flags
& ATA_FLAG_SRST
)
2071 if (ata_bus_softreset(ap
, devmask
))
2075 * determine by signature whether we have ATA or ATAPI devices
2077 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2078 if ((slave_possible
) && (err
!= 0x81))
2079 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2081 /* re-enable interrupts */
2082 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2085 /* is double-select really necessary? */
2086 if (ap
->device
[1].class != ATA_DEV_NONE
)
2087 ap
->ops
->dev_select(ap
, 1);
2088 if (ap
->device
[0].class != ATA_DEV_NONE
)
2089 ap
->ops
->dev_select(ap
, 0);
2091 /* if no devices were detected, disable this port */
2092 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2093 (ap
->device
[1].class == ATA_DEV_NONE
))
2096 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2097 /* set up device control for ATA_FLAG_SATA_RESET */
2098 if (ap
->flags
& ATA_FLAG_MMIO
)
2099 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2101 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2108 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2109 ap
->ops
->port_disable(ap
);
2114 static int sata_phy_resume(struct ata_port
*ap
)
2116 unsigned long timeout
= jiffies
+ (HZ
* 5);
2119 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2121 /* Wait for phy to become ready, if necessary. */
2124 sstatus
= scr_read(ap
, SCR_STATUS
);
2125 if ((sstatus
& 0xf) != 1)
2127 } while (time_before(jiffies
, timeout
));
2133 * ata_std_probeinit - initialize probing
2134 * @ap: port to be probed
2136 * @ap is about to be probed. Initialize it. This function is
2137 * to be used as standard callback for ata_drive_probe_reset().
2139 * NOTE!!! Do not use this function as probeinit if a low level
2140 * driver implements only hardreset. Just pass NULL as probeinit
2141 * in that case. Using this function is probably okay but doing
2142 * so makes reset sequence different from the original
2143 * ->phy_reset implementation and Jeff nervous. :-P
2145 extern void ata_std_probeinit(struct ata_port
*ap
)
2147 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2148 sata_phy_resume(ap
);
2149 if (sata_dev_present(ap
))
2150 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2155 * ata_std_softreset - reset host port via ATA SRST
2156 * @ap: port to reset
2157 * @verbose: fail verbosely
2158 * @classes: resulting classes of attached devices
2160 * Reset host port using ATA SRST. This function is to be used
2161 * as standard callback for ata_drive_*_reset() functions.
2164 * Kernel thread context (may sleep)
2167 * 0 on success, -errno otherwise.
2169 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2171 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2172 unsigned int devmask
= 0, err_mask
;
2177 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2178 classes
[0] = ATA_DEV_NONE
;
2182 /* determine if device 0/1 are present */
2183 if (ata_devchk(ap
, 0))
2184 devmask
|= (1 << 0);
2185 if (slave_possible
&& ata_devchk(ap
, 1))
2186 devmask
|= (1 << 1);
2188 /* select device 0 again */
2189 ap
->ops
->dev_select(ap
, 0);
2191 /* issue bus reset */
2192 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2193 err_mask
= ata_bus_softreset(ap
, devmask
);
2196 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2199 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2204 /* determine by signature whether we have ATA or ATAPI devices */
2205 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2206 if (slave_possible
&& err
!= 0x81)
2207 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2210 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2215 * sata_std_hardreset - reset host port via SATA phy reset
2216 * @ap: port to reset
2217 * @verbose: fail verbosely
2218 * @class: resulting class of attached device
2220 * SATA phy-reset host port using DET bits of SControl register.
2221 * This function is to be used as standard callback for
2222 * ata_drive_*_reset().
2225 * Kernel thread context (may sleep)
2228 * 0 on success, -errno otherwise.
2230 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2234 /* Issue phy wake/reset */
2235 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2238 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2239 * 10.4.2 says at least 1 ms.
2243 /* Bring phy back */
2244 sata_phy_resume(ap
);
2246 /* TODO: phy layer with polling, timeouts, etc. */
2247 if (!sata_dev_present(ap
)) {
2248 *class = ATA_DEV_NONE
;
2249 DPRINTK("EXIT, link offline\n");
2253 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2255 printk(KERN_ERR
"ata%u: COMRESET failed "
2256 "(device not ready)\n", ap
->id
);
2258 DPRINTK("EXIT, device not ready\n");
2262 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2264 *class = ata_dev_try_classify(ap
, 0, NULL
);
2266 DPRINTK("EXIT, class=%u\n", *class);
2271 * ata_std_postreset - standard postreset callback
2272 * @ap: the target ata_port
2273 * @classes: classes of attached devices
2275 * This function is invoked after a successful reset. Note that
2276 * the device might have been reset more than once using
2277 * different reset methods before postreset is invoked.
2279 * This function is to be used as standard callback for
2280 * ata_drive_*_reset().
2283 * Kernel thread context (may sleep)
2285 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2289 /* set cable type if it isn't already set */
2290 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2291 ap
->cbl
= ATA_CBL_SATA
;
2293 /* print link status */
2294 if (ap
->cbl
== ATA_CBL_SATA
)
2295 sata_print_link_status(ap
);
2297 /* re-enable interrupts */
2298 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2301 /* is double-select really necessary? */
2302 if (classes
[0] != ATA_DEV_NONE
)
2303 ap
->ops
->dev_select(ap
, 1);
2304 if (classes
[1] != ATA_DEV_NONE
)
2305 ap
->ops
->dev_select(ap
, 0);
2307 /* bail out if no device is present */
2308 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2309 DPRINTK("EXIT, no device\n");
2313 /* set up device control */
2314 if (ap
->ioaddr
.ctl_addr
) {
2315 if (ap
->flags
& ATA_FLAG_MMIO
)
2316 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2318 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2325 * ata_std_probe_reset - standard probe reset method
2326 * @ap: prot to perform probe-reset
2327 * @classes: resulting classes of attached devices
2329 * The stock off-the-shelf ->probe_reset method.
2332 * Kernel thread context (may sleep)
2335 * 0 on success, -errno otherwise.
2337 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2339 ata_reset_fn_t hardreset
;
2342 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2343 hardreset
= sata_std_hardreset
;
2345 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2346 ata_std_softreset
, hardreset
,
2347 ata_std_postreset
, classes
);
2350 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2351 ata_postreset_fn_t postreset
,
2352 unsigned int *classes
)
2356 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2357 classes
[i
] = ATA_DEV_UNKNOWN
;
2359 rc
= reset(ap
, 0, classes
);
2363 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2364 * is complete and convert all ATA_DEV_UNKNOWN to
2367 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2368 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2371 if (i
< ATA_MAX_DEVICES
)
2372 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2373 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2374 classes
[i
] = ATA_DEV_NONE
;
2377 postreset(ap
, classes
);
2379 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2383 * ata_drive_probe_reset - Perform probe reset with given methods
2384 * @ap: port to reset
2385 * @probeinit: probeinit method (can be NULL)
2386 * @softreset: softreset method (can be NULL)
2387 * @hardreset: hardreset method (can be NULL)
2388 * @postreset: postreset method (can be NULL)
2389 * @classes: resulting classes of attached devices
2391 * Reset the specified port and classify attached devices using
2392 * given methods. This function prefers softreset but tries all
2393 * possible reset sequences to reset and classify devices. This
2394 * function is intended to be used for constructing ->probe_reset
2395 * callback by low level drivers.
2397 * Reset methods should follow the following rules.
2399 * - Return 0 on sucess, -errno on failure.
2400 * - If classification is supported, fill classes[] with
2401 * recognized class codes.
2402 * - If classification is not supported, leave classes[] alone.
2403 * - If verbose is non-zero, print error message on failure;
2404 * otherwise, shut up.
2407 * Kernel thread context (may sleep)
2410 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2411 * if classification fails, and any error code from reset
2414 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2415 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2416 ata_postreset_fn_t postreset
, unsigned int *classes
)
2424 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2432 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2433 if (rc
== 0 || rc
!= -ENODEV
)
2437 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2443 * ata_dev_same_device - Determine whether new ID matches configured device
2444 * @ap: port on which the device to compare against resides
2445 * @dev: device to compare against
2446 * @new_class: class of the new device
2447 * @new_id: IDENTIFY page of the new device
2449 * Compare @new_class and @new_id against @dev and determine
2450 * whether @dev is the device indicated by @new_class and
2457 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2459 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2460 unsigned int new_class
, const u16
*new_id
)
2462 const u16
*old_id
= dev
->id
;
2463 unsigned char model
[2][41], serial
[2][21];
2466 if (dev
->class != new_class
) {
2468 "ata%u: dev %u class mismatch %d != %d\n",
2469 ap
->id
, dev
->devno
, dev
->class, new_class
);
2473 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2474 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2475 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2476 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2477 new_n_sectors
= ata_id_n_sectors(new_id
);
2479 if (strcmp(model
[0], model
[1])) {
2481 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2482 ap
->id
, dev
->devno
, model
[0], model
[1]);
2486 if (strcmp(serial
[0], serial
[1])) {
2488 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2489 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2493 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2495 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2496 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2497 (unsigned long long)new_n_sectors
);
2505 * ata_dev_revalidate - Revalidate ATA device
2506 * @ap: port on which the device to revalidate resides
2507 * @dev: device to revalidate
2508 * @post_reset: is this revalidation after reset?
2510 * Re-read IDENTIFY page and make sure @dev is still attached to
2514 * Kernel thread context (may sleep)
2517 * 0 on success, negative errno otherwise
2519 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2526 if (!ata_dev_present(dev
))
2532 /* allocate & read ID data */
2533 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2537 /* is the device still there? */
2538 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2546 /* configure device according to the new ID */
2547 return ata_dev_configure(ap
, dev
, 0);
2550 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2551 ap
->id
, dev
->devno
, rc
);
2556 static const char * const ata_dma_blacklist
[] = {
2557 "WDC AC11000H", NULL
,
2558 "WDC AC22100H", NULL
,
2559 "WDC AC32500H", NULL
,
2560 "WDC AC33100H", NULL
,
2561 "WDC AC31600H", NULL
,
2562 "WDC AC32100H", "24.09P07",
2563 "WDC AC23200L", "21.10N21",
2564 "Compaq CRD-8241B", NULL
,
2569 "SanDisk SDP3B", NULL
,
2570 "SanDisk SDP3B-64", NULL
,
2571 "SANYO CD-ROM CRD", NULL
,
2572 "HITACHI CDR-8", NULL
,
2573 "HITACHI CDR-8335", NULL
,
2574 "HITACHI CDR-8435", NULL
,
2575 "Toshiba CD-ROM XM-6202B", NULL
,
2576 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2578 "E-IDE CD-ROM CR-840", NULL
,
2579 "CD-ROM Drive/F5A", NULL
,
2580 "WPI CDD-820", NULL
,
2581 "SAMSUNG CD-ROM SC-148C", NULL
,
2582 "SAMSUNG CD-ROM SC", NULL
,
2583 "SanDisk SDP3B-64", NULL
,
2584 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2585 "_NEC DV5800A", NULL
,
2586 "SAMSUNG CD-ROM SN-124", "N001"
2589 static int ata_strim(char *s
, size_t len
)
2591 len
= strnlen(s
, len
);
2593 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2594 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2601 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2603 unsigned char model_num
[40];
2604 unsigned char model_rev
[16];
2605 unsigned int nlen
, rlen
;
2608 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2610 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2612 nlen
= ata_strim(model_num
, sizeof(model_num
));
2613 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2615 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2616 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2617 if (ata_dma_blacklist
[i
+1] == NULL
)
2619 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2627 * ata_dev_xfermask - Compute supported xfermask of the given device
2628 * @ap: Port on which the device to compute xfermask for resides
2629 * @dev: Device to compute xfermask for
2631 * Compute supported xfermask of @dev and store it in
2632 * dev->*_mask. This function is responsible for applying all
2633 * known limits including host controller limits, device
2636 * FIXME: The current implementation limits all transfer modes to
2637 * the fastest of the lowested device on the port. This is not
2638 * required on most controllers.
2643 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2645 unsigned long xfer_mask
;
2648 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2651 /* use port-wide xfermask for now */
2652 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2653 struct ata_device
*d
= &ap
->device
[i
];
2654 if (!ata_dev_present(d
))
2656 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
, d
->mwdma_mask
,
2658 xfer_mask
&= ata_id_xfermask(d
->id
);
2659 if (ata_dma_blacklisted(d
))
2660 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2663 if (ata_dma_blacklisted(dev
))
2664 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2665 "disabling DMA\n", ap
->id
, dev
->devno
);
2667 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2672 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2673 * @ap: Port associated with device @dev
2674 * @dev: Device to which command will be sent
2676 * Issue SET FEATURES - XFER MODE command to device @dev
2680 * PCI/etc. bus probe sem.
2683 * 0 on success, AC_ERR_* mask otherwise.
2686 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2687 struct ata_device
*dev
)
2689 struct ata_taskfile tf
;
2690 unsigned int err_mask
;
2692 /* set up set-features taskfile */
2693 DPRINTK("set features - xfer mode\n");
2695 ata_tf_init(ap
, &tf
, dev
->devno
);
2696 tf
.command
= ATA_CMD_SET_FEATURES
;
2697 tf
.feature
= SETFEATURES_XFER
;
2698 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2699 tf
.protocol
= ATA_PROT_NODATA
;
2700 tf
.nsect
= dev
->xfer_mode
;
2702 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2704 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2709 * ata_dev_init_params - Issue INIT DEV PARAMS command
2710 * @ap: Port associated with device @dev
2711 * @dev: Device to which command will be sent
2714 * Kernel thread context (may sleep)
2717 * 0 on success, AC_ERR_* mask otherwise.
2720 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2721 struct ata_device
*dev
)
2723 struct ata_taskfile tf
;
2724 unsigned int err_mask
;
2725 u16 sectors
= dev
->id
[6];
2726 u16 heads
= dev
->id
[3];
2728 /* Number of sectors per track 1-255. Number of heads 1-16 */
2729 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2732 /* set up init dev params taskfile */
2733 DPRINTK("init dev params \n");
2735 ata_tf_init(ap
, &tf
, dev
->devno
);
2736 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2737 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2738 tf
.protocol
= ATA_PROT_NODATA
;
2740 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2742 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2744 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2749 * ata_sg_clean - Unmap DMA memory associated with command
2750 * @qc: Command containing DMA memory to be released
2752 * Unmap all mapped DMA memory associated with this command.
2755 * spin_lock_irqsave(host_set lock)
2758 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2760 struct ata_port
*ap
= qc
->ap
;
2761 struct scatterlist
*sg
= qc
->__sg
;
2762 int dir
= qc
->dma_dir
;
2763 void *pad_buf
= NULL
;
2765 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2766 WARN_ON(sg
== NULL
);
2768 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2769 WARN_ON(qc
->n_elem
> 1);
2771 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2773 /* if we padded the buffer out to 32-bit bound, and data
2774 * xfer direction is from-device, we must copy from the
2775 * pad buffer back into the supplied buffer
2777 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2778 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2780 if (qc
->flags
& ATA_QCFLAG_SG
) {
2782 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
2783 /* restore last sg */
2784 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2786 struct scatterlist
*psg
= &qc
->pad_sgent
;
2787 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2788 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2789 kunmap_atomic(addr
, KM_IRQ0
);
2793 dma_unmap_single(ap
->dev
,
2794 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2797 sg
->length
+= qc
->pad_len
;
2799 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2800 pad_buf
, qc
->pad_len
);
2803 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2808 * ata_fill_sg - Fill PCI IDE PRD table
2809 * @qc: Metadata associated with taskfile to be transferred
2811 * Fill PCI IDE PRD (scatter-gather) table with segments
2812 * associated with the current disk command.
2815 * spin_lock_irqsave(host_set lock)
2818 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2820 struct ata_port
*ap
= qc
->ap
;
2821 struct scatterlist
*sg
;
2824 WARN_ON(qc
->__sg
== NULL
);
2825 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2828 ata_for_each_sg(sg
, qc
) {
2832 /* determine if physical DMA addr spans 64K boundary.
2833 * Note h/w doesn't support 64-bit, so we unconditionally
2834 * truncate dma_addr_t to u32.
2836 addr
= (u32
) sg_dma_address(sg
);
2837 sg_len
= sg_dma_len(sg
);
2840 offset
= addr
& 0xffff;
2842 if ((offset
+ sg_len
) > 0x10000)
2843 len
= 0x10000 - offset
;
2845 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2846 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2847 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2856 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2859 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2860 * @qc: Metadata associated with taskfile to check
2862 * Allow low-level driver to filter ATA PACKET commands, returning
2863 * a status indicating whether or not it is OK to use DMA for the
2864 * supplied PACKET command.
2867 * spin_lock_irqsave(host_set lock)
2869 * RETURNS: 0 when ATAPI DMA can be used
2872 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2874 struct ata_port
*ap
= qc
->ap
;
2875 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2877 if (ap
->ops
->check_atapi_dma
)
2878 rc
= ap
->ops
->check_atapi_dma(qc
);
2883 * ata_qc_prep - Prepare taskfile for submission
2884 * @qc: Metadata associated with taskfile to be prepared
2886 * Prepare ATA taskfile for submission.
2889 * spin_lock_irqsave(host_set lock)
2891 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2893 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2899 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
2902 * ata_sg_init_one - Associate command with memory buffer
2903 * @qc: Command to be associated
2904 * @buf: Memory buffer
2905 * @buflen: Length of memory buffer, in bytes.
2907 * Initialize the data-related elements of queued_cmd @qc
2908 * to point to a single memory buffer, @buf of byte length @buflen.
2911 * spin_lock_irqsave(host_set lock)
2914 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2916 struct scatterlist
*sg
;
2918 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2920 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2921 qc
->__sg
= &qc
->sgent
;
2923 qc
->orig_n_elem
= 1;
2927 sg_init_one(sg
, buf
, buflen
);
2931 * ata_sg_init - Associate command with scatter-gather table.
2932 * @qc: Command to be associated
2933 * @sg: Scatter-gather table.
2934 * @n_elem: Number of elements in s/g table.
2936 * Initialize the data-related elements of queued_cmd @qc
2937 * to point to a scatter-gather table @sg, containing @n_elem
2941 * spin_lock_irqsave(host_set lock)
2944 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2945 unsigned int n_elem
)
2947 qc
->flags
|= ATA_QCFLAG_SG
;
2949 qc
->n_elem
= n_elem
;
2950 qc
->orig_n_elem
= n_elem
;
2954 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2955 * @qc: Command with memory buffer to be mapped.
2957 * DMA-map the memory buffer associated with queued_cmd @qc.
2960 * spin_lock_irqsave(host_set lock)
2963 * Zero on success, negative on error.
2966 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2968 struct ata_port
*ap
= qc
->ap
;
2969 int dir
= qc
->dma_dir
;
2970 struct scatterlist
*sg
= qc
->__sg
;
2971 dma_addr_t dma_address
;
2974 /* we must lengthen transfers to end on a 32-bit boundary */
2975 qc
->pad_len
= sg
->length
& 3;
2977 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2978 struct scatterlist
*psg
= &qc
->pad_sgent
;
2980 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2982 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2984 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2985 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2988 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2989 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2991 sg
->length
-= qc
->pad_len
;
2992 if (sg
->length
== 0)
2995 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2996 sg
->length
, qc
->pad_len
);
3004 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3006 if (dma_mapping_error(dma_address
)) {
3008 sg
->length
+= qc
->pad_len
;
3012 sg_dma_address(sg
) = dma_address
;
3013 sg_dma_len(sg
) = sg
->length
;
3016 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3017 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3023 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3024 * @qc: Command with scatter-gather table to be mapped.
3026 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3029 * spin_lock_irqsave(host_set lock)
3032 * Zero on success, negative on error.
3036 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3038 struct ata_port
*ap
= qc
->ap
;
3039 struct scatterlist
*sg
= qc
->__sg
;
3040 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3041 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3043 VPRINTK("ENTER, ata%u\n", ap
->id
);
3044 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3046 /* we must lengthen transfers to end on a 32-bit boundary */
3047 qc
->pad_len
= lsg
->length
& 3;
3049 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3050 struct scatterlist
*psg
= &qc
->pad_sgent
;
3051 unsigned int offset
;
3053 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3055 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3058 * psg->page/offset are used to copy to-be-written
3059 * data in this function or read data in ata_sg_clean.
3061 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3062 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3063 psg
->offset
= offset_in_page(offset
);
3065 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3066 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3067 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3068 kunmap_atomic(addr
, KM_IRQ0
);
3071 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3072 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3074 lsg
->length
-= qc
->pad_len
;
3075 if (lsg
->length
== 0)
3078 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3079 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3082 pre_n_elem
= qc
->n_elem
;
3083 if (trim_sg
&& pre_n_elem
)
3092 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3094 /* restore last sg */
3095 lsg
->length
+= qc
->pad_len
;
3099 DPRINTK("%d sg elements mapped\n", n_elem
);
3102 qc
->n_elem
= n_elem
;
3108 * ata_poll_qc_complete - turn irq back on and finish qc
3109 * @qc: Command to complete
3110 * @err_mask: ATA status register content
3113 * None. (grabs host lock)
3116 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3118 struct ata_port
*ap
= qc
->ap
;
3119 unsigned long flags
;
3121 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3122 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3124 ata_qc_complete(qc
);
3125 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3129 * ata_pio_poll - poll using PIO, depending on current state
3130 * @ap: the target ata_port
3133 * None. (executing in kernel thread context)
3136 * timeout value to use
3139 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3141 struct ata_queued_cmd
*qc
;
3143 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3144 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3146 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3147 WARN_ON(qc
== NULL
);
3149 switch (ap
->hsm_task_state
) {
3152 poll_state
= HSM_ST_POLL
;
3156 case HSM_ST_LAST_POLL
:
3157 poll_state
= HSM_ST_LAST_POLL
;
3158 reg_state
= HSM_ST_LAST
;
3165 status
= ata_chk_status(ap
);
3166 if (status
& ATA_BUSY
) {
3167 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3168 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3169 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3172 ap
->hsm_task_state
= poll_state
;
3173 return ATA_SHORT_PAUSE
;
3176 ap
->hsm_task_state
= reg_state
;
3181 * ata_pio_complete - check if drive is busy or idle
3182 * @ap: the target ata_port
3185 * None. (executing in kernel thread context)
3188 * Non-zero if qc completed, zero otherwise.
3191 static int ata_pio_complete (struct ata_port
*ap
)
3193 struct ata_queued_cmd
*qc
;
3197 * This is purely heuristic. This is a fast path. Sometimes when
3198 * we enter, BSY will be cleared in a chk-status or two. If not,
3199 * the drive is probably seeking or something. Snooze for a couple
3200 * msecs, then chk-status again. If still busy, fall back to
3201 * HSM_ST_POLL state.
3203 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3204 if (drv_stat
& ATA_BUSY
) {
3206 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3207 if (drv_stat
& ATA_BUSY
) {
3208 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3209 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3214 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3215 WARN_ON(qc
== NULL
);
3217 drv_stat
= ata_wait_idle(ap
);
3218 if (!ata_ok(drv_stat
)) {
3219 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3220 ap
->hsm_task_state
= HSM_ST_ERR
;
3224 ap
->hsm_task_state
= HSM_ST_IDLE
;
3226 WARN_ON(qc
->err_mask
);
3227 ata_poll_qc_complete(qc
);
3229 /* another command may start at this point */
3236 * swap_buf_le16 - swap halves of 16-bit words in place
3237 * @buf: Buffer to swap
3238 * @buf_words: Number of 16-bit words in buffer.
3240 * Swap halves of 16-bit words if needed to convert from
3241 * little-endian byte order to native cpu byte order, or
3245 * Inherited from caller.
3247 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3252 for (i
= 0; i
< buf_words
; i
++)
3253 buf
[i
] = le16_to_cpu(buf
[i
]);
3254 #endif /* __BIG_ENDIAN */
3258 * ata_mmio_data_xfer - Transfer data by MMIO
3259 * @ap: port to read/write
3261 * @buflen: buffer length
3262 * @write_data: read/write
3264 * Transfer data from/to the device data register by MMIO.
3267 * Inherited from caller.
3270 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3271 unsigned int buflen
, int write_data
)
3274 unsigned int words
= buflen
>> 1;
3275 u16
*buf16
= (u16
*) buf
;
3276 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3278 /* Transfer multiple of 2 bytes */
3280 for (i
= 0; i
< words
; i
++)
3281 writew(le16_to_cpu(buf16
[i
]), mmio
);
3283 for (i
= 0; i
< words
; i
++)
3284 buf16
[i
] = cpu_to_le16(readw(mmio
));
3287 /* Transfer trailing 1 byte, if any. */
3288 if (unlikely(buflen
& 0x01)) {
3289 u16 align_buf
[1] = { 0 };
3290 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3293 memcpy(align_buf
, trailing_buf
, 1);
3294 writew(le16_to_cpu(align_buf
[0]), mmio
);
3296 align_buf
[0] = cpu_to_le16(readw(mmio
));
3297 memcpy(trailing_buf
, align_buf
, 1);
3303 * ata_pio_data_xfer - Transfer data by PIO
3304 * @ap: port to read/write
3306 * @buflen: buffer length
3307 * @write_data: read/write
3309 * Transfer data from/to the device data register by PIO.
3312 * Inherited from caller.
3315 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3316 unsigned int buflen
, int write_data
)
3318 unsigned int words
= buflen
>> 1;
3320 /* Transfer multiple of 2 bytes */
3322 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3324 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3326 /* Transfer trailing 1 byte, if any. */
3327 if (unlikely(buflen
& 0x01)) {
3328 u16 align_buf
[1] = { 0 };
3329 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3332 memcpy(align_buf
, trailing_buf
, 1);
3333 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3335 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3336 memcpy(trailing_buf
, align_buf
, 1);
3342 * ata_data_xfer - Transfer data from/to the data register.
3343 * @ap: port to read/write
3345 * @buflen: buffer length
3346 * @do_write: read/write
3348 * Transfer data from/to the device data register.
3351 * Inherited from caller.
3354 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3355 unsigned int buflen
, int do_write
)
3357 /* Make the crap hardware pay the costs not the good stuff */
3358 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3359 unsigned long flags
;
3360 local_irq_save(flags
);
3361 if (ap
->flags
& ATA_FLAG_MMIO
)
3362 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3364 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3365 local_irq_restore(flags
);
3367 if (ap
->flags
& ATA_FLAG_MMIO
)
3368 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3370 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3375 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3376 * @qc: Command on going
3378 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3381 * Inherited from caller.
3384 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3386 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3387 struct scatterlist
*sg
= qc
->__sg
;
3388 struct ata_port
*ap
= qc
->ap
;
3390 unsigned int offset
;
3393 if (qc
->cursect
== (qc
->nsect
- 1))
3394 ap
->hsm_task_state
= HSM_ST_LAST
;
3396 page
= sg
[qc
->cursg
].page
;
3397 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3399 /* get the current page and offset */
3400 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3401 offset
%= PAGE_SIZE
;
3403 buf
= kmap(page
) + offset
;
3408 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3413 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3415 /* do the actual data transfer */
3416 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3417 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3423 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3424 * @qc: Command on going
3425 * @bytes: number of bytes
3427 * Transfer Transfer data from/to the ATAPI device.
3430 * Inherited from caller.
3434 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3436 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3437 struct scatterlist
*sg
= qc
->__sg
;
3438 struct ata_port
*ap
= qc
->ap
;
3441 unsigned int offset
, count
;
3443 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3444 ap
->hsm_task_state
= HSM_ST_LAST
;
3447 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3449 * The end of qc->sg is reached and the device expects
3450 * more data to transfer. In order not to overrun qc->sg
3451 * and fulfill length specified in the byte count register,
3452 * - for read case, discard trailing data from the device
3453 * - for write case, padding zero data to the device
3455 u16 pad_buf
[1] = { 0 };
3456 unsigned int words
= bytes
>> 1;
3459 if (words
) /* warning if bytes > 1 */
3460 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3463 for (i
= 0; i
< words
; i
++)
3464 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3466 ap
->hsm_task_state
= HSM_ST_LAST
;
3470 sg
= &qc
->__sg
[qc
->cursg
];
3473 offset
= sg
->offset
+ qc
->cursg_ofs
;
3475 /* get the current page and offset */
3476 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3477 offset
%= PAGE_SIZE
;
3479 /* don't overrun current sg */
3480 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3482 /* don't cross page boundaries */
3483 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3485 buf
= kmap(page
) + offset
;
3488 qc
->curbytes
+= count
;
3489 qc
->cursg_ofs
+= count
;
3491 if (qc
->cursg_ofs
== sg
->length
) {
3496 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3498 /* do the actual data transfer */
3499 ata_data_xfer(ap
, buf
, count
, do_write
);
3508 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3509 * @qc: Command on going
3511 * Transfer Transfer data from/to the ATAPI device.
3514 * Inherited from caller.
3517 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3519 struct ata_port
*ap
= qc
->ap
;
3520 struct ata_device
*dev
= qc
->dev
;
3521 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3522 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3524 ap
->ops
->tf_read(ap
, &qc
->tf
);
3525 ireason
= qc
->tf
.nsect
;
3526 bc_lo
= qc
->tf
.lbam
;
3527 bc_hi
= qc
->tf
.lbah
;
3528 bytes
= (bc_hi
<< 8) | bc_lo
;
3530 /* shall be cleared to zero, indicating xfer of data */
3531 if (ireason
& (1 << 0))
3534 /* make sure transfer direction matches expected */
3535 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3536 if (do_write
!= i_write
)
3539 __atapi_pio_bytes(qc
, bytes
);
3544 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3545 ap
->id
, dev
->devno
);
3546 qc
->err_mask
|= AC_ERR_HSM
;
3547 ap
->hsm_task_state
= HSM_ST_ERR
;
3551 * ata_pio_block - start PIO on a block
3552 * @ap: the target ata_port
3555 * None. (executing in kernel thread context)
3558 static void ata_pio_block(struct ata_port
*ap
)
3560 struct ata_queued_cmd
*qc
;
3564 * This is purely heuristic. This is a fast path.
3565 * Sometimes when we enter, BSY will be cleared in
3566 * a chk-status or two. If not, the drive is probably seeking
3567 * or something. Snooze for a couple msecs, then
3568 * chk-status again. If still busy, fall back to
3569 * HSM_ST_POLL state.
3571 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3572 if (status
& ATA_BUSY
) {
3574 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3575 if (status
& ATA_BUSY
) {
3576 ap
->hsm_task_state
= HSM_ST_POLL
;
3577 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3582 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3583 WARN_ON(qc
== NULL
);
3586 if (status
& (ATA_ERR
| ATA_DF
)) {
3587 qc
->err_mask
|= AC_ERR_DEV
;
3588 ap
->hsm_task_state
= HSM_ST_ERR
;
3592 /* transfer data if any */
3593 if (is_atapi_taskfile(&qc
->tf
)) {
3594 /* DRQ=0 means no more data to transfer */
3595 if ((status
& ATA_DRQ
) == 0) {
3596 ap
->hsm_task_state
= HSM_ST_LAST
;
3600 atapi_pio_bytes(qc
);
3602 /* handle BSY=0, DRQ=0 as error */
3603 if ((status
& ATA_DRQ
) == 0) {
3604 qc
->err_mask
|= AC_ERR_HSM
;
3605 ap
->hsm_task_state
= HSM_ST_ERR
;
3613 static void ata_pio_error(struct ata_port
*ap
)
3615 struct ata_queued_cmd
*qc
;
3617 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3618 WARN_ON(qc
== NULL
);
3620 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3621 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3623 /* make sure qc->err_mask is available to
3624 * know what's wrong and recover
3626 WARN_ON(qc
->err_mask
== 0);
3628 ap
->hsm_task_state
= HSM_ST_IDLE
;
3630 ata_poll_qc_complete(qc
);
3633 static void ata_pio_task(void *_data
)
3635 struct ata_port
*ap
= _data
;
3636 unsigned long timeout
;
3643 switch (ap
->hsm_task_state
) {
3652 qc_completed
= ata_pio_complete(ap
);
3656 case HSM_ST_LAST_POLL
:
3657 timeout
= ata_pio_poll(ap
);
3667 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3668 else if (!qc_completed
)
3673 * atapi_packet_task - Write CDB bytes to hardware
3674 * @_data: Port to which ATAPI device is attached.
3676 * When device has indicated its readiness to accept
3677 * a CDB, this function is called. Send the CDB.
3678 * If DMA is to be performed, exit immediately.
3679 * Otherwise, we are in polling mode, so poll
3680 * status under operation succeeds or fails.
3683 * Kernel thread context (may sleep)
3686 static void atapi_packet_task(void *_data
)
3688 struct ata_port
*ap
= _data
;
3689 struct ata_queued_cmd
*qc
;
3692 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3693 WARN_ON(qc
== NULL
);
3694 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3696 /* sleep-wait for BSY to clear */
3697 DPRINTK("busy wait\n");
3698 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3699 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3703 /* make sure DRQ is set */
3704 status
= ata_chk_status(ap
);
3705 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3706 qc
->err_mask
|= AC_ERR_HSM
;
3711 DPRINTK("send cdb\n");
3712 WARN_ON(qc
->dev
->cdb_len
< 12);
3714 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3715 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3716 unsigned long flags
;
3718 /* Once we're done issuing command and kicking bmdma,
3719 * irq handler takes over. To not lose irq, we need
3720 * to clear NOINTR flag before sending cdb, but
3721 * interrupt handler shouldn't be invoked before we're
3722 * finished. Hence, the following locking.
3724 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3725 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3726 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3727 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3728 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3729 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3731 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3733 /* PIO commands are handled by polling */
3734 ap
->hsm_task_state
= HSM_ST
;
3735 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3741 ata_poll_qc_complete(qc
);
3745 * ata_qc_timeout - Handle timeout of queued command
3746 * @qc: Command that timed out
3748 * Some part of the kernel (currently, only the SCSI layer)
3749 * has noticed that the active command on port @ap has not
3750 * completed after a specified length of time. Handle this
3751 * condition by disabling DMA (if necessary) and completing
3752 * transactions, with error if necessary.
3754 * This also handles the case of the "lost interrupt", where
3755 * for some reason (possibly hardware bug, possibly driver bug)
3756 * an interrupt was not delivered to the driver, even though the
3757 * transaction completed successfully.
3760 * Inherited from SCSI layer (none, can sleep)
3763 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3765 struct ata_port
*ap
= qc
->ap
;
3766 struct ata_host_set
*host_set
= ap
->host_set
;
3767 u8 host_stat
= 0, drv_stat
;
3768 unsigned long flags
;
3772 ap
->hsm_task_state
= HSM_ST_IDLE
;
3774 spin_lock_irqsave(&host_set
->lock
, flags
);
3776 switch (qc
->tf
.protocol
) {
3779 case ATA_PROT_ATAPI_DMA
:
3780 host_stat
= ap
->ops
->bmdma_status(ap
);
3782 /* before we do anything else, clear DMA-Start bit */
3783 ap
->ops
->bmdma_stop(qc
);
3789 drv_stat
= ata_chk_status(ap
);
3791 /* ack bmdma irq events */
3792 ap
->ops
->irq_clear(ap
);
3794 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3795 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3797 /* complete taskfile transaction */
3798 qc
->err_mask
|= ac_err_mask(drv_stat
);
3802 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3804 ata_eh_qc_complete(qc
);
3810 * ata_eng_timeout - Handle timeout of queued command
3811 * @ap: Port on which timed-out command is active
3813 * Some part of the kernel (currently, only the SCSI layer)
3814 * has noticed that the active command on port @ap has not
3815 * completed after a specified length of time. Handle this
3816 * condition by disabling DMA (if necessary) and completing
3817 * transactions, with error if necessary.
3819 * This also handles the case of the "lost interrupt", where
3820 * for some reason (possibly hardware bug, possibly driver bug)
3821 * an interrupt was not delivered to the driver, even though the
3822 * transaction completed successfully.
3825 * Inherited from SCSI layer (none, can sleep)
3828 void ata_eng_timeout(struct ata_port
*ap
)
3832 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3838 * ata_qc_new - Request an available ATA command, for queueing
3839 * @ap: Port associated with device @dev
3840 * @dev: Device from whom we request an available command structure
3846 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3848 struct ata_queued_cmd
*qc
= NULL
;
3851 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3852 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3853 qc
= ata_qc_from_tag(ap
, i
);
3864 * ata_qc_new_init - Request an available ATA command, and initialize it
3865 * @ap: Port associated with device @dev
3866 * @dev: Device from whom we request an available command structure
3872 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3873 struct ata_device
*dev
)
3875 struct ata_queued_cmd
*qc
;
3877 qc
= ata_qc_new(ap
);
3890 * ata_qc_free - free unused ata_queued_cmd
3891 * @qc: Command to complete
3893 * Designed to free unused ata_queued_cmd object
3894 * in case something prevents using it.
3897 * spin_lock_irqsave(host_set lock)
3899 void ata_qc_free(struct ata_queued_cmd
*qc
)
3901 struct ata_port
*ap
= qc
->ap
;
3904 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3908 if (likely(ata_tag_valid(tag
))) {
3909 if (tag
== ap
->active_tag
)
3910 ap
->active_tag
= ATA_TAG_POISON
;
3911 qc
->tag
= ATA_TAG_POISON
;
3912 clear_bit(tag
, &ap
->qactive
);
3916 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3918 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3919 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3921 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3924 /* atapi: mark qc as inactive to prevent the interrupt handler
3925 * from completing the command twice later, before the error handler
3926 * is called. (when rc != 0 and atapi request sense is needed)
3928 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3930 /* call completion callback */
3931 qc
->complete_fn(qc
);
3934 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3936 struct ata_port
*ap
= qc
->ap
;
3938 switch (qc
->tf
.protocol
) {
3940 case ATA_PROT_ATAPI_DMA
:
3943 case ATA_PROT_ATAPI
:
3945 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3958 * ata_qc_issue - issue taskfile to device
3959 * @qc: command to issue to device
3961 * Prepare an ATA command to submission to device.
3962 * This includes mapping the data into a DMA-able
3963 * area, filling in the S/G table, and finally
3964 * writing the taskfile to hardware, starting the command.
3967 * spin_lock_irqsave(host_set lock)
3970 * Zero on success, AC_ERR_* mask on failure
3973 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3975 struct ata_port
*ap
= qc
->ap
;
3977 if (ata_should_dma_map(qc
)) {
3978 if (qc
->flags
& ATA_QCFLAG_SG
) {
3979 if (ata_sg_setup(qc
))
3981 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3982 if (ata_sg_setup_one(qc
))
3986 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3989 ap
->ops
->qc_prep(qc
);
3991 qc
->ap
->active_tag
= qc
->tag
;
3992 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3994 return ap
->ops
->qc_issue(qc
);
3997 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3998 return AC_ERR_SYSTEM
;
4003 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4004 * @qc: command to issue to device
4006 * Using various libata functions and hooks, this function
4007 * starts an ATA command. ATA commands are grouped into
4008 * classes called "protocols", and issuing each type of protocol
4009 * is slightly different.
4011 * May be used as the qc_issue() entry in ata_port_operations.
4014 * spin_lock_irqsave(host_set lock)
4017 * Zero on success, AC_ERR_* mask on failure
4020 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4022 struct ata_port
*ap
= qc
->ap
;
4024 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4026 switch (qc
->tf
.protocol
) {
4027 case ATA_PROT_NODATA
:
4028 ata_tf_to_host(ap
, &qc
->tf
);
4032 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4033 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4034 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4037 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4038 ata_qc_set_polling(qc
);
4039 ata_tf_to_host(ap
, &qc
->tf
);
4040 ap
->hsm_task_state
= HSM_ST
;
4041 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4044 case ATA_PROT_ATAPI
:
4045 ata_qc_set_polling(qc
);
4046 ata_tf_to_host(ap
, &qc
->tf
);
4047 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4050 case ATA_PROT_ATAPI_NODATA
:
4051 ap
->flags
|= ATA_FLAG_NOINTR
;
4052 ata_tf_to_host(ap
, &qc
->tf
);
4053 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4056 case ATA_PROT_ATAPI_DMA
:
4057 ap
->flags
|= ATA_FLAG_NOINTR
;
4058 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4059 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4060 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4065 return AC_ERR_SYSTEM
;
4072 * ata_host_intr - Handle host interrupt for given (port, task)
4073 * @ap: Port on which interrupt arrived (possibly...)
4074 * @qc: Taskfile currently active in engine
4076 * Handle host interrupt for given queued command. Currently,
4077 * only DMA interrupts are handled. All other commands are
4078 * handled via polling with interrupts disabled (nIEN bit).
4081 * spin_lock_irqsave(host_set lock)
4084 * One if interrupt was handled, zero if not (shared irq).
4087 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4088 struct ata_queued_cmd
*qc
)
4090 u8 status
, host_stat
;
4092 switch (qc
->tf
.protocol
) {
4095 case ATA_PROT_ATAPI_DMA
:
4096 case ATA_PROT_ATAPI
:
4097 /* check status of DMA engine */
4098 host_stat
= ap
->ops
->bmdma_status(ap
);
4099 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4101 /* if it's not our irq... */
4102 if (!(host_stat
& ATA_DMA_INTR
))
4105 /* before we do anything else, clear DMA-Start bit */
4106 ap
->ops
->bmdma_stop(qc
);
4110 case ATA_PROT_ATAPI_NODATA
:
4111 case ATA_PROT_NODATA
:
4112 /* check altstatus */
4113 status
= ata_altstatus(ap
);
4114 if (status
& ATA_BUSY
)
4117 /* check main status, clearing INTRQ */
4118 status
= ata_chk_status(ap
);
4119 if (unlikely(status
& ATA_BUSY
))
4121 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4122 ap
->id
, qc
->tf
.protocol
, status
);
4124 /* ack bmdma irq events */
4125 ap
->ops
->irq_clear(ap
);
4127 /* complete taskfile transaction */
4128 qc
->err_mask
|= ac_err_mask(status
);
4129 ata_qc_complete(qc
);
4136 return 1; /* irq handled */
4139 ap
->stats
.idle_irq
++;
4142 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4143 ata_irq_ack(ap
, 0); /* debug trap */
4144 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4148 return 0; /* irq not handled */
4152 * ata_interrupt - Default ATA host interrupt handler
4153 * @irq: irq line (unused)
4154 * @dev_instance: pointer to our ata_host_set information structure
4157 * Default interrupt handler for PCI IDE devices. Calls
4158 * ata_host_intr() for each port that is not disabled.
4161 * Obtains host_set lock during operation.
4164 * IRQ_NONE or IRQ_HANDLED.
4167 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4169 struct ata_host_set
*host_set
= dev_instance
;
4171 unsigned int handled
= 0;
4172 unsigned long flags
;
4174 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4175 spin_lock_irqsave(&host_set
->lock
, flags
);
4177 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4178 struct ata_port
*ap
;
4180 ap
= host_set
->ports
[i
];
4182 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4183 struct ata_queued_cmd
*qc
;
4185 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4186 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4187 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4188 handled
|= ata_host_intr(ap
, qc
);
4192 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4194 return IRQ_RETVAL(handled
);
4199 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4200 * without filling any other registers
4202 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4205 struct ata_taskfile tf
;
4208 ata_tf_init(ap
, &tf
, dev
->devno
);
4211 tf
.flags
|= ATA_TFLAG_DEVICE
;
4212 tf
.protocol
= ATA_PROT_NODATA
;
4214 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4216 printk(KERN_ERR
"%s: ata command failed: %d\n",
4222 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4226 if (!ata_try_flush_cache(dev
))
4229 if (ata_id_has_flush_ext(dev
->id
))
4230 cmd
= ATA_CMD_FLUSH_EXT
;
4232 cmd
= ATA_CMD_FLUSH
;
4234 return ata_do_simple_cmd(ap
, dev
, cmd
);
4237 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4239 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4242 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4244 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4248 * ata_device_resume - wakeup a previously suspended devices
4249 * @ap: port the device is connected to
4250 * @dev: the device to resume
4252 * Kick the drive back into action, by sending it an idle immediate
4253 * command and making sure its transfer mode matches between drive
4257 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4259 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4260 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4263 if (!ata_dev_present(dev
))
4265 if (dev
->class == ATA_DEV_ATA
)
4266 ata_start_drive(ap
, dev
);
4272 * ata_device_suspend - prepare a device for suspend
4273 * @ap: port the device is connected to
4274 * @dev: the device to suspend
4276 * Flush the cache on the drive, if appropriate, then issue a
4277 * standbynow command.
4279 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4281 if (!ata_dev_present(dev
))
4283 if (dev
->class == ATA_DEV_ATA
)
4284 ata_flush_cache(ap
, dev
);
4286 if (state
.event
!= PM_EVENT_FREEZE
)
4287 ata_standby_drive(ap
, dev
);
4288 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4293 * ata_port_start - Set port up for dma.
4294 * @ap: Port to initialize
4296 * Called just after data structures for each port are
4297 * initialized. Allocates space for PRD table.
4299 * May be used as the port_start() entry in ata_port_operations.
4302 * Inherited from caller.
4305 int ata_port_start (struct ata_port
*ap
)
4307 struct device
*dev
= ap
->dev
;
4310 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4314 rc
= ata_pad_alloc(ap
, dev
);
4316 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4320 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4327 * ata_port_stop - Undo ata_port_start()
4328 * @ap: Port to shut down
4330 * Frees the PRD table.
4332 * May be used as the port_stop() entry in ata_port_operations.
4335 * Inherited from caller.
4338 void ata_port_stop (struct ata_port
*ap
)
4340 struct device
*dev
= ap
->dev
;
4342 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4343 ata_pad_free(ap
, dev
);
4346 void ata_host_stop (struct ata_host_set
*host_set
)
4348 if (host_set
->mmio_base
)
4349 iounmap(host_set
->mmio_base
);
4354 * ata_host_remove - Unregister SCSI host structure with upper layers
4355 * @ap: Port to unregister
4356 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4359 * Inherited from caller.
4362 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4364 struct Scsi_Host
*sh
= ap
->host
;
4369 scsi_remove_host(sh
);
4371 ap
->ops
->port_stop(ap
);
4375 * ata_host_init - Initialize an ata_port structure
4376 * @ap: Structure to initialize
4377 * @host: associated SCSI mid-layer structure
4378 * @host_set: Collection of hosts to which @ap belongs
4379 * @ent: Probe information provided by low-level driver
4380 * @port_no: Port number associated with this ata_port
4382 * Initialize a new ata_port structure, and its associated
4386 * Inherited from caller.
4389 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4390 struct ata_host_set
*host_set
,
4391 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4397 host
->max_channel
= 1;
4398 host
->unique_id
= ata_unique_id
++;
4399 host
->max_cmd_len
= 12;
4401 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4402 ap
->id
= host
->unique_id
;
4404 ap
->ctl
= ATA_DEVCTL_OBS
;
4405 ap
->host_set
= host_set
;
4407 ap
->port_no
= port_no
;
4409 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4410 ap
->pio_mask
= ent
->pio_mask
;
4411 ap
->mwdma_mask
= ent
->mwdma_mask
;
4412 ap
->udma_mask
= ent
->udma_mask
;
4413 ap
->flags
|= ent
->host_flags
;
4414 ap
->ops
= ent
->port_ops
;
4415 ap
->cbl
= ATA_CBL_NONE
;
4416 ap
->active_tag
= ATA_TAG_POISON
;
4417 ap
->last_ctl
= 0xFF;
4419 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4420 INIT_LIST_HEAD(&ap
->eh_done_q
);
4422 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4423 struct ata_device
*dev
= &ap
->device
[i
];
4425 dev
->pio_mask
= UINT_MAX
;
4426 dev
->mwdma_mask
= UINT_MAX
;
4427 dev
->udma_mask
= UINT_MAX
;
4431 ap
->stats
.unhandled_irq
= 1;
4432 ap
->stats
.idle_irq
= 1;
4435 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4439 * ata_host_add - Attach low-level ATA driver to system
4440 * @ent: Information provided by low-level driver
4441 * @host_set: Collections of ports to which we add
4442 * @port_no: Port number associated with this host
4444 * Attach low-level ATA driver to system.
4447 * PCI/etc. bus probe sem.
4450 * New ata_port on success, for NULL on error.
4453 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4454 struct ata_host_set
*host_set
,
4455 unsigned int port_no
)
4457 struct Scsi_Host
*host
;
4458 struct ata_port
*ap
;
4463 if (!ent
->port_ops
->probe_reset
&&
4464 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4465 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4470 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4474 host
->transportt
= &ata_scsi_transport_template
;
4476 ap
= (struct ata_port
*) &host
->hostdata
[0];
4478 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4480 rc
= ap
->ops
->port_start(ap
);
4487 scsi_host_put(host
);
4492 * ata_device_add - Register hardware device with ATA and SCSI layers
4493 * @ent: Probe information describing hardware device to be registered
4495 * This function processes the information provided in the probe
4496 * information struct @ent, allocates the necessary ATA and SCSI
4497 * host information structures, initializes them, and registers
4498 * everything with requisite kernel subsystems.
4500 * This function requests irqs, probes the ATA bus, and probes
4504 * PCI/etc. bus probe sem.
4507 * Number of ports registered. Zero on error (no ports registered).
4510 int ata_device_add(const struct ata_probe_ent
*ent
)
4512 unsigned int count
= 0, i
;
4513 struct device
*dev
= ent
->dev
;
4514 struct ata_host_set
*host_set
;
4517 /* alloc a container for our list of ATA ports (buses) */
4518 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4519 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4522 spin_lock_init(&host_set
->lock
);
4524 host_set
->dev
= dev
;
4525 host_set
->n_ports
= ent
->n_ports
;
4526 host_set
->irq
= ent
->irq
;
4527 host_set
->mmio_base
= ent
->mmio_base
;
4528 host_set
->private_data
= ent
->private_data
;
4529 host_set
->ops
= ent
->port_ops
;
4531 /* register each port bound to this device */
4532 for (i
= 0; i
< ent
->n_ports
; i
++) {
4533 struct ata_port
*ap
;
4534 unsigned long xfer_mode_mask
;
4536 ap
= ata_host_add(ent
, host_set
, i
);
4540 host_set
->ports
[i
] = ap
;
4541 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4542 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4543 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4545 /* print per-port info to dmesg */
4546 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4547 "bmdma 0x%lX irq %lu\n",
4549 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4550 ata_mode_string(xfer_mode_mask
),
4551 ap
->ioaddr
.cmd_addr
,
4552 ap
->ioaddr
.ctl_addr
,
4553 ap
->ioaddr
.bmdma_addr
,
4557 host_set
->ops
->irq_clear(ap
);
4564 /* obtain irq, that is shared between channels */
4565 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4566 DRV_NAME
, host_set
))
4569 /* perform each probe synchronously */
4570 DPRINTK("probe begin\n");
4571 for (i
= 0; i
< count
; i
++) {
4572 struct ata_port
*ap
;
4575 ap
= host_set
->ports
[i
];
4577 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4578 rc
= ata_bus_probe(ap
);
4579 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4582 /* FIXME: do something useful here?
4583 * Current libata behavior will
4584 * tear down everything when
4585 * the module is removed
4586 * or the h/w is unplugged.
4590 rc
= scsi_add_host(ap
->host
, dev
);
4592 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4594 /* FIXME: do something useful here */
4595 /* FIXME: handle unconditional calls to
4596 * scsi_scan_host and ata_host_remove, below,
4602 /* probes are done, now scan each port's disk(s) */
4603 DPRINTK("host probe begin\n");
4604 for (i
= 0; i
< count
; i
++) {
4605 struct ata_port
*ap
= host_set
->ports
[i
];
4607 ata_scsi_scan_host(ap
);
4610 dev_set_drvdata(dev
, host_set
);
4612 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4613 return ent
->n_ports
; /* success */
4616 for (i
= 0; i
< count
; i
++) {
4617 ata_host_remove(host_set
->ports
[i
], 1);
4618 scsi_host_put(host_set
->ports
[i
]->host
);
4622 VPRINTK("EXIT, returning 0\n");
4627 * ata_host_set_remove - PCI layer callback for device removal
4628 * @host_set: ATA host set that was removed
4630 * Unregister all objects associated with this host set. Free those
4634 * Inherited from calling layer (may sleep).
4637 void ata_host_set_remove(struct ata_host_set
*host_set
)
4639 struct ata_port
*ap
;
4642 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4643 ap
= host_set
->ports
[i
];
4644 scsi_remove_host(ap
->host
);
4647 free_irq(host_set
->irq
, host_set
);
4649 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4650 ap
= host_set
->ports
[i
];
4652 ata_scsi_release(ap
->host
);
4654 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4655 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4657 if (ioaddr
->cmd_addr
== 0x1f0)
4658 release_region(0x1f0, 8);
4659 else if (ioaddr
->cmd_addr
== 0x170)
4660 release_region(0x170, 8);
4663 scsi_host_put(ap
->host
);
4666 if (host_set
->ops
->host_stop
)
4667 host_set
->ops
->host_stop(host_set
);
4673 * ata_scsi_release - SCSI layer callback hook for host unload
4674 * @host: libata host to be unloaded
4676 * Performs all duties necessary to shut down a libata port...
4677 * Kill port kthread, disable port, and release resources.
4680 * Inherited from SCSI layer.
4686 int ata_scsi_release(struct Scsi_Host
*host
)
4688 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4693 ap
->ops
->port_disable(ap
);
4694 ata_host_remove(ap
, 0);
4695 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4696 kfree(ap
->device
[i
].id
);
4703 * ata_std_ports - initialize ioaddr with standard port offsets.
4704 * @ioaddr: IO address structure to be initialized
4706 * Utility function which initializes data_addr, error_addr,
4707 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4708 * device_addr, status_addr, and command_addr to standard offsets
4709 * relative to cmd_addr.
4711 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4714 void ata_std_ports(struct ata_ioports
*ioaddr
)
4716 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4717 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4718 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4719 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4720 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4721 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4722 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4723 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4724 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4725 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4731 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4733 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4735 pci_iounmap(pdev
, host_set
->mmio_base
);
4739 * ata_pci_remove_one - PCI layer callback for device removal
4740 * @pdev: PCI device that was removed
4742 * PCI layer indicates to libata via this hook that
4743 * hot-unplug or module unload event has occurred.
4744 * Handle this by unregistering all objects associated
4745 * with this PCI device. Free those objects. Then finally
4746 * release PCI resources and disable device.
4749 * Inherited from PCI layer (may sleep).
4752 void ata_pci_remove_one (struct pci_dev
*pdev
)
4754 struct device
*dev
= pci_dev_to_dev(pdev
);
4755 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4757 ata_host_set_remove(host_set
);
4758 pci_release_regions(pdev
);
4759 pci_disable_device(pdev
);
4760 dev_set_drvdata(dev
, NULL
);
4763 /* move to PCI subsystem */
4764 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4766 unsigned long tmp
= 0;
4768 switch (bits
->width
) {
4771 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4777 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4783 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4794 return (tmp
== bits
->val
) ? 1 : 0;
4797 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4799 pci_save_state(pdev
);
4800 pci_disable_device(pdev
);
4801 pci_set_power_state(pdev
, PCI_D3hot
);
4805 int ata_pci_device_resume(struct pci_dev
*pdev
)
4807 pci_set_power_state(pdev
, PCI_D0
);
4808 pci_restore_state(pdev
);
4809 pci_enable_device(pdev
);
4810 pci_set_master(pdev
);
4813 #endif /* CONFIG_PCI */
4816 static int __init
ata_init(void)
4818 ata_wq
= create_workqueue("ata");
4822 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4826 static void __exit
ata_exit(void)
4828 destroy_workqueue(ata_wq
);
4831 module_init(ata_init
);
4832 module_exit(ata_exit
);
4834 static unsigned long ratelimit_time
;
4835 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4837 int ata_ratelimit(void)
4840 unsigned long flags
;
4842 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4844 if (time_after(jiffies
, ratelimit_time
)) {
4846 ratelimit_time
= jiffies
+ (HZ
/5);
4850 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4856 * libata is essentially a library of internal helper functions for
4857 * low-level ATA host controller drivers. As such, the API/ABI is
4858 * likely to change as new drivers are added and updated.
4859 * Do not depend on ABI/API stability.
4862 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4863 EXPORT_SYMBOL_GPL(ata_std_ports
);
4864 EXPORT_SYMBOL_GPL(ata_device_add
);
4865 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4866 EXPORT_SYMBOL_GPL(ata_sg_init
);
4867 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4868 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
4869 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4870 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4871 EXPORT_SYMBOL_GPL(ata_tf_load
);
4872 EXPORT_SYMBOL_GPL(ata_tf_read
);
4873 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4874 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4875 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4876 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4877 EXPORT_SYMBOL_GPL(ata_check_status
);
4878 EXPORT_SYMBOL_GPL(ata_altstatus
);
4879 EXPORT_SYMBOL_GPL(ata_exec_command
);
4880 EXPORT_SYMBOL_GPL(ata_port_start
);
4881 EXPORT_SYMBOL_GPL(ata_port_stop
);
4882 EXPORT_SYMBOL_GPL(ata_host_stop
);
4883 EXPORT_SYMBOL_GPL(ata_interrupt
);
4884 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4885 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
4886 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4887 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4888 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4889 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4890 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4891 EXPORT_SYMBOL_GPL(ata_port_probe
);
4892 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4893 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4894 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4895 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
4896 EXPORT_SYMBOL_GPL(ata_std_softreset
);
4897 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
4898 EXPORT_SYMBOL_GPL(ata_std_postreset
);
4899 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
4900 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
4901 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
4902 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4903 EXPORT_SYMBOL_GPL(ata_dev_pair
);
4904 EXPORT_SYMBOL_GPL(ata_port_disable
);
4905 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4906 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
4907 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
4908 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4909 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4910 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4911 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4912 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4913 EXPORT_SYMBOL_GPL(ata_host_intr
);
4914 EXPORT_SYMBOL_GPL(ata_id_string
);
4915 EXPORT_SYMBOL_GPL(ata_id_c_string
);
4916 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4917 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
4918 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
4920 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
4921 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4922 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4925 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4926 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4927 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4928 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4929 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4930 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
4931 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
4932 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
4933 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
4934 #endif /* CONFIG_PCI */
4936 EXPORT_SYMBOL_GPL(ata_device_suspend
);
4937 EXPORT_SYMBOL_GPL(ata_device_resume
);
4938 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
4939 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);