2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
65 u16 heads
, u16 sectors
);
66 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
67 static void ata_dev_xfermask(struct ata_device
*dev
);
69 static unsigned int ata_unique_id
= 1;
70 static struct workqueue_struct
*ata_wq
;
72 int atapi_enabled
= 1;
73 module_param(atapi_enabled
, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir
, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua
, libata_fua
, int, 0444);
82 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
105 fis
[0] = 0x27; /* Register - Host to Device FIS */
106 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis
[2] = tf
->command
;
109 fis
[3] = tf
->feature
;
116 fis
[8] = tf
->hob_lbal
;
117 fis
[9] = tf
->hob_lbam
;
118 fis
[10] = tf
->hob_lbah
;
119 fis
[11] = tf
->hob_feature
;
122 fis
[13] = tf
->hob_nsect
;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
145 tf
->command
= fis
[2]; /* status */
146 tf
->feature
= fis
[3]; /* error */
153 tf
->hob_lbal
= fis
[8];
154 tf
->hob_lbam
= fis
[9];
155 tf
->hob_lbah
= fis
[10];
158 tf
->hob_nsect
= fis
[13];
161 static const u8 ata_rw_cmds
[] = {
165 ATA_CMD_READ_MULTI_EXT
,
166 ATA_CMD_WRITE_MULTI_EXT
,
170 ATA_CMD_WRITE_MULTI_FUA_EXT
,
174 ATA_CMD_PIO_READ_EXT
,
175 ATA_CMD_PIO_WRITE_EXT
,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
203 struct ata_taskfile
*tf
= &qc
->tf
;
204 struct ata_device
*dev
= qc
->dev
;
207 int index
, fua
, lba48
, write
;
209 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
210 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
211 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
213 if (dev
->flags
& ATA_DFLAG_PIO
) {
214 tf
->protocol
= ATA_PROT_PIO
;
215 index
= dev
->multi_count
? 0 : 8;
216 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
217 /* Unable to use DMA due to host limitation */
218 tf
->protocol
= ATA_PROT_PIO
;
219 index
= dev
->multi_count
? 0 : 8;
221 tf
->protocol
= ATA_PROT_DMA
;
225 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
249 unsigned int mwdma_mask
,
250 unsigned int udma_mask
)
252 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
253 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
254 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask
,
268 unsigned int *pio_mask
,
269 unsigned int *mwdma_mask
,
270 unsigned int *udma_mask
)
273 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
275 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
277 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
280 static const struct ata_xfer_ent
{
284 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
285 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
286 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
305 int highbit
= fls(xfer_mask
) - 1;
306 const struct ata_xfer_ent
*ent
;
308 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
309 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
310 return ent
->base
+ highbit
- ent
->shift
;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
328 const struct ata_xfer_ent
*ent
;
330 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
331 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
332 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
350 const struct ata_xfer_ent
*ent
;
352 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
353 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask
)
374 static const char * const xfer_mode_str
[] = {
394 highbit
= fls(xfer_mask
) - 1;
395 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
396 return xfer_mode_str
[highbit
];
400 static const char *sata_spd_string(unsigned int spd
)
402 static const char * const spd_str
[] = {
407 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
409 return spd_str
[spd
- 1];
412 void ata_dev_disable(struct ata_device
*dev
)
414 if (ata_dev_enabled(dev
)) {
415 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
416 dev
->ap
->id
, dev
->devno
);
422 * ata_pio_devchk - PATA device presence detection
423 * @ap: ATA channel to examine
424 * @device: Device to examine (starting at zero)
426 * This technique was originally described in
427 * Hale Landis's ATADRVR (www.ata-atapi.com), and
428 * later found its way into the ATA/ATAPI spec.
430 * Write a pattern to the ATA shadow registers,
431 * and if a device is present, it will respond by
432 * correctly storing and echoing back the
433 * ATA shadow register contents.
439 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
442 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
445 ap
->ops
->dev_select(ap
, device
);
447 outb(0x55, ioaddr
->nsect_addr
);
448 outb(0xaa, ioaddr
->lbal_addr
);
450 outb(0xaa, ioaddr
->nsect_addr
);
451 outb(0x55, ioaddr
->lbal_addr
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 nsect
= inb(ioaddr
->nsect_addr
);
457 lbal
= inb(ioaddr
->lbal_addr
);
459 if ((nsect
== 0x55) && (lbal
== 0xaa))
460 return 1; /* we found a device */
462 return 0; /* nothing found */
466 * ata_mmio_devchk - PATA device presence detection
467 * @ap: ATA channel to examine
468 * @device: Device to examine (starting at zero)
470 * This technique was originally described in
471 * Hale Landis's ATADRVR (www.ata-atapi.com), and
472 * later found its way into the ATA/ATAPI spec.
474 * Write a pattern to the ATA shadow registers,
475 * and if a device is present, it will respond by
476 * correctly storing and echoing back the
477 * ATA shadow register contents.
483 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
486 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
489 ap
->ops
->dev_select(ap
, device
);
491 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
492 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
494 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
495 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
501 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
503 if ((nsect
== 0x55) && (lbal
== 0xaa))
504 return 1; /* we found a device */
506 return 0; /* nothing found */
510 * ata_devchk - PATA device presence detection
511 * @ap: ATA channel to examine
512 * @device: Device to examine (starting at zero)
514 * Dispatch ATA device presence detection, depending
515 * on whether we are using PIO or MMIO to talk to the
516 * ATA shadow registers.
522 static unsigned int ata_devchk(struct ata_port
*ap
,
525 if (ap
->flags
& ATA_FLAG_MMIO
)
526 return ata_mmio_devchk(ap
, device
);
527 return ata_pio_devchk(ap
, device
);
531 * ata_dev_classify - determine device type based on ATA-spec signature
532 * @tf: ATA taskfile register set for device to be identified
534 * Determine from taskfile register contents whether a device is
535 * ATA or ATAPI, as per "Signature and persistence" section
536 * of ATA/PI spec (volume 1, sect 5.14).
542 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
543 * the event of failure.
546 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
548 /* Apple's open source Darwin code hints that some devices only
549 * put a proper signature into the LBA mid/high registers,
550 * So, we only check those. It's sufficient for uniqueness.
553 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
554 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
555 DPRINTK("found ATA device by sig\n");
559 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
560 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
561 DPRINTK("found ATAPI device by sig\n");
562 return ATA_DEV_ATAPI
;
565 DPRINTK("unknown device\n");
566 return ATA_DEV_UNKNOWN
;
570 * ata_dev_try_classify - Parse returned ATA device signature
571 * @ap: ATA channel to examine
572 * @device: Device to examine (starting at zero)
573 * @r_err: Value of error register on completion
575 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
576 * an ATA/ATAPI-defined set of values is placed in the ATA
577 * shadow registers, indicating the results of device detection
580 * Select the ATA device, and read the values from the ATA shadow
581 * registers. Then parse according to the Error register value,
582 * and the spec-defined values examined by ata_dev_classify().
588 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
592 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
594 struct ata_taskfile tf
;
598 ap
->ops
->dev_select(ap
, device
);
600 memset(&tf
, 0, sizeof(tf
));
602 ap
->ops
->tf_read(ap
, &tf
);
607 /* see if device passed diags */
610 else if ((device
== 0) && (err
== 0x81))
615 /* determine if device is ATA or ATAPI */
616 class = ata_dev_classify(&tf
);
618 if (class == ATA_DEV_UNKNOWN
)
620 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
626 * ata_id_string - Convert IDENTIFY DEVICE page into string
627 * @id: IDENTIFY DEVICE results we will examine
628 * @s: string into which data is output
629 * @ofs: offset into identify device page
630 * @len: length of string to return. must be an even number.
632 * The strings in the IDENTIFY DEVICE page are broken up into
633 * 16-bit chunks. Run through the string, and output each
634 * 8-bit chunk linearly, regardless of platform.
640 void ata_id_string(const u16
*id
, unsigned char *s
,
641 unsigned int ofs
, unsigned int len
)
660 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
661 * @id: IDENTIFY DEVICE results we will examine
662 * @s: string into which data is output
663 * @ofs: offset into identify device page
664 * @len: length of string to return. must be an odd number.
666 * This function is identical to ata_id_string except that it
667 * trims trailing spaces and terminates the resulting string with
668 * null. @len must be actual maximum length (even number) + 1.
673 void ata_id_c_string(const u16
*id
, unsigned char *s
,
674 unsigned int ofs
, unsigned int len
)
680 ata_id_string(id
, s
, ofs
, len
- 1);
682 p
= s
+ strnlen(s
, len
- 1);
683 while (p
> s
&& p
[-1] == ' ')
688 static u64
ata_id_n_sectors(const u16
*id
)
690 if (ata_id_has_lba(id
)) {
691 if (ata_id_has_lba48(id
))
692 return ata_id_u64(id
, 100);
694 return ata_id_u32(id
, 60);
696 if (ata_id_current_chs_valid(id
))
697 return ata_id_u32(id
, 57);
699 return id
[1] * id
[3] * id
[6];
704 * ata_noop_dev_select - Select device 0/1 on ATA bus
705 * @ap: ATA channel to manipulate
706 * @device: ATA device (numbered from zero) to select
708 * This function performs no actual function.
710 * May be used as the dev_select() entry in ata_port_operations.
715 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
721 * ata_std_dev_select - Select device 0/1 on ATA bus
722 * @ap: ATA channel to manipulate
723 * @device: ATA device (numbered from zero) to select
725 * Use the method defined in the ATA specification to
726 * make either device 0, or device 1, active on the
727 * ATA channel. Works with both PIO and MMIO.
729 * May be used as the dev_select() entry in ata_port_operations.
735 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
740 tmp
= ATA_DEVICE_OBS
;
742 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
744 if (ap
->flags
& ATA_FLAG_MMIO
) {
745 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
747 outb(tmp
, ap
->ioaddr
.device_addr
);
749 ata_pause(ap
); /* needed; also flushes, for mmio */
753 * ata_dev_select - Select device 0/1 on ATA bus
754 * @ap: ATA channel to manipulate
755 * @device: ATA device (numbered from zero) to select
756 * @wait: non-zero to wait for Status register BSY bit to clear
757 * @can_sleep: non-zero if context allows sleeping
759 * Use the method defined in the ATA specification to
760 * make either device 0, or device 1, active on the
763 * This is a high-level version of ata_std_dev_select(),
764 * which additionally provides the services of inserting
765 * the proper pauses and status polling, where needed.
771 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
772 unsigned int wait
, unsigned int can_sleep
)
774 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
775 ap
->id
, device
, wait
);
780 ap
->ops
->dev_select(ap
, device
);
783 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
790 * ata_dump_id - IDENTIFY DEVICE info debugging output
791 * @id: IDENTIFY DEVICE page to dump
793 * Dump selected 16-bit words from the given IDENTIFY DEVICE
800 static inline void ata_dump_id(const u16
*id
)
802 DPRINTK("49==0x%04x "
812 DPRINTK("80==0x%04x "
822 DPRINTK("88==0x%04x "
829 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
830 * @id: IDENTIFY data to compute xfer mask from
832 * Compute the xfermask for this device. This is not as trivial
833 * as it seems if we must consider early devices correctly.
835 * FIXME: pre IDE drive timing (do we care ?).
843 static unsigned int ata_id_xfermask(const u16
*id
)
845 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
847 /* Usual case. Word 53 indicates word 64 is valid */
848 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
849 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
853 /* If word 64 isn't valid then Word 51 high byte holds
854 * the PIO timing number for the maximum. Turn it into
857 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
859 /* But wait.. there's more. Design your standards by
860 * committee and you too can get a free iordy field to
861 * process. However its the speeds not the modes that
862 * are supported... Note drivers using the timing API
863 * will get this right anyway
867 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
870 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
871 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
873 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
877 * ata_port_queue_task - Queue port_task
878 * @ap: The ata_port to queue port_task for
880 * Schedule @fn(@data) for execution after @delay jiffies using
881 * port_task. There is one port_task per port and it's the
882 * user(low level driver)'s responsibility to make sure that only
883 * one task is active at any given time.
885 * libata core layer takes care of synchronization between
886 * port_task and EH. ata_port_queue_task() may be ignored for EH
890 * Inherited from caller.
892 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
897 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
900 PREPARE_WORK(&ap
->port_task
, fn
, data
);
903 rc
= queue_work(ata_wq
, &ap
->port_task
);
905 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
907 /* rc == 0 means that another user is using port task */
912 * ata_port_flush_task - Flush port_task
913 * @ap: The ata_port to flush port_task for
915 * After this function completes, port_task is guranteed not to
916 * be running or scheduled.
919 * Kernel thread context (may sleep)
921 void ata_port_flush_task(struct ata_port
*ap
)
927 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
928 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
929 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
931 DPRINTK("flush #1\n");
932 flush_workqueue(ata_wq
);
935 * At this point, if a task is running, it's guaranteed to see
936 * the FLUSH flag; thus, it will never queue pio tasks again.
939 if (!cancel_delayed_work(&ap
->port_task
)) {
940 DPRINTK("flush #2\n");
941 flush_workqueue(ata_wq
);
944 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
945 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
946 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
951 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
953 struct completion
*waiting
= qc
->private_data
;
959 * ata_exec_internal - execute libata internal command
960 * @dev: Device to which the command is sent
961 * @tf: Taskfile registers for the command and the result
962 * @cdb: CDB for packet command
963 * @dma_dir: Data tranfer direction of the command
964 * @buf: Data buffer of the command
965 * @buflen: Length of data buffer
967 * Executes libata internal command with timeout. @tf contains
968 * command on entry and result on return. Timeout and error
969 * conditions are reported via return value. No recovery action
970 * is taken after a command times out. It's caller's duty to
971 * clean up after timeout.
974 * None. Should be called with kernel context, might sleep.
977 unsigned ata_exec_internal(struct ata_device
*dev
,
978 struct ata_taskfile
*tf
, const u8
*cdb
,
979 int dma_dir
, void *buf
, unsigned int buflen
)
981 struct ata_port
*ap
= dev
->ap
;
982 u8 command
= tf
->command
;
983 struct ata_queued_cmd
*qc
;
984 DECLARE_COMPLETION(wait
);
986 unsigned int err_mask
;
988 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
990 qc
= ata_qc_new_init(dev
);
995 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
996 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
997 qc
->dma_dir
= dma_dir
;
998 if (dma_dir
!= DMA_NONE
) {
999 ata_sg_init_one(qc
, buf
, buflen
);
1000 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1003 qc
->private_data
= &wait
;
1004 qc
->complete_fn
= ata_qc_complete_internal
;
1008 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1010 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1011 ata_port_flush_task(ap
);
1013 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1015 /* We're racing with irq here. If we lose, the
1016 * following test prevents us from completing the qc
1017 * again. If completion irq occurs after here but
1018 * before the caller cleans up, it will result in a
1019 * spurious interrupt. We can live with that.
1021 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1022 qc
->err_mask
= AC_ERR_TIMEOUT
;
1023 ata_qc_complete(qc
);
1024 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1028 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1032 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1034 *tf
= qc
->result_tf
;
1035 err_mask
= qc
->err_mask
;
1039 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1040 * Until those drivers are fixed, we detect the condition
1041 * here, fail the command with AC_ERR_SYSTEM and reenable the
1044 * Note that this doesn't change any behavior as internal
1045 * command failure results in disabling the device in the
1046 * higher layer for LLDDs without new reset/EH callbacks.
1048 * Kill the following code as soon as those drivers are fixed.
1050 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1051 err_mask
|= AC_ERR_SYSTEM
;
1055 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1061 * ata_pio_need_iordy - check if iordy needed
1064 * Check if the current speed of the device requires IORDY. Used
1065 * by various controllers for chip configuration.
1068 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1071 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1078 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1080 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1081 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1082 /* Is the speed faster than the drive allows non IORDY ? */
1084 /* This is cycle times not frequency - watch the logic! */
1085 if (pio
> 240) /* PIO2 is 240nS per cycle */
1094 * ata_dev_read_id - Read ID data from the specified device
1095 * @dev: target device
1096 * @p_class: pointer to class of the target device (may be changed)
1097 * @post_reset: is this read ID post-reset?
1098 * @id: buffer to read IDENTIFY data into
1100 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1101 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1102 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1103 * for pre-ATA4 drives.
1106 * Kernel thread context (may sleep)
1109 * 0 on success, -errno otherwise.
1111 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1112 int post_reset
, u16
*id
)
1114 struct ata_port
*ap
= dev
->ap
;
1115 unsigned int class = *p_class
;
1116 struct ata_taskfile tf
;
1117 unsigned int err_mask
= 0;
1121 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1123 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1126 ata_tf_init(dev
, &tf
);
1130 tf
.command
= ATA_CMD_ID_ATA
;
1133 tf
.command
= ATA_CMD_ID_ATAPI
;
1137 reason
= "unsupported class";
1141 tf
.protocol
= ATA_PROT_PIO
;
1143 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1144 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1147 reason
= "I/O error";
1151 swap_buf_le16(id
, ATA_ID_WORDS
);
1154 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1156 reason
= "device reports illegal type";
1160 if (post_reset
&& class == ATA_DEV_ATA
) {
1162 * The exact sequence expected by certain pre-ATA4 drives is:
1165 * INITIALIZE DEVICE PARAMETERS
1167 * Some drives were very specific about that exact sequence.
1169 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1170 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1173 reason
= "INIT_DEV_PARAMS failed";
1177 /* current CHS translation info (id[53-58]) might be
1178 * changed. reread the identify device info.
1190 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1191 ap
->id
, dev
->devno
, reason
);
1195 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1197 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1201 * ata_dev_configure - Configure the specified ATA/ATAPI device
1202 * @dev: Target device to configure
1203 * @print_info: Enable device info printout
1205 * Configure @dev according to @dev->id. Generic and low-level
1206 * driver specific fixups are also applied.
1209 * Kernel thread context (may sleep)
1212 * 0 on success, -errno otherwise
1214 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1216 struct ata_port
*ap
= dev
->ap
;
1217 const u16
*id
= dev
->id
;
1218 unsigned int xfer_mask
;
1221 if (!ata_dev_enabled(dev
)) {
1222 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1223 ap
->id
, dev
->devno
);
1227 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1229 /* print device capabilities */
1231 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1232 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1233 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1234 id
[84], id
[85], id
[86], id
[87], id
[88]);
1236 /* initialize to-be-configured parameters */
1237 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1238 dev
->max_sectors
= 0;
1246 * common ATA, ATAPI feature tests
1249 /* find max transfer mode; for printk only */
1250 xfer_mask
= ata_id_xfermask(id
);
1254 /* ATA-specific feature tests */
1255 if (dev
->class == ATA_DEV_ATA
) {
1256 dev
->n_sectors
= ata_id_n_sectors(id
);
1258 if (ata_id_has_lba(id
)) {
1259 const char *lba_desc
;
1262 dev
->flags
|= ATA_DFLAG_LBA
;
1263 if (ata_id_has_lba48(id
)) {
1264 dev
->flags
|= ATA_DFLAG_LBA48
;
1268 /* print device info to dmesg */
1270 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1271 "max %s, %Lu sectors: %s\n",
1273 ata_id_major_version(id
),
1274 ata_mode_string(xfer_mask
),
1275 (unsigned long long)dev
->n_sectors
,
1280 /* Default translation */
1281 dev
->cylinders
= id
[1];
1283 dev
->sectors
= id
[6];
1285 if (ata_id_current_chs_valid(id
)) {
1286 /* Current CHS translation is valid. */
1287 dev
->cylinders
= id
[54];
1288 dev
->heads
= id
[55];
1289 dev
->sectors
= id
[56];
1292 /* print device info to dmesg */
1294 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1295 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1297 ata_id_major_version(id
),
1298 ata_mode_string(xfer_mask
),
1299 (unsigned long long)dev
->n_sectors
,
1300 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1306 /* ATAPI-specific feature tests */
1307 else if (dev
->class == ATA_DEV_ATAPI
) {
1308 rc
= atapi_cdb_len(id
);
1309 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1310 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1314 dev
->cdb_len
= (unsigned int) rc
;
1316 /* print device info to dmesg */
1318 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1319 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1322 ap
->host
->max_cmd_len
= 0;
1323 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1324 ap
->host
->max_cmd_len
= max_t(unsigned int,
1325 ap
->host
->max_cmd_len
,
1326 ap
->device
[i
].cdb_len
);
1328 /* limit bridge transfers to udma5, 200 sectors */
1329 if (ata_dev_knobble(dev
)) {
1331 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1332 ap
->id
, dev
->devno
);
1333 dev
->udma_mask
&= ATA_UDMA5
;
1334 dev
->max_sectors
= ATA_MAX_SECTORS
;
1337 if (ap
->ops
->dev_config
)
1338 ap
->ops
->dev_config(ap
, dev
);
1340 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1344 DPRINTK("EXIT, err\n");
1349 * ata_bus_probe - Reset and probe ATA bus
1352 * Master ATA bus probing function. Initiates a hardware-dependent
1353 * bus reset, then attempts to identify any devices found on
1357 * PCI/etc. bus probe sem.
1360 * Zero on success, negative errno otherwise.
1363 static int ata_bus_probe(struct ata_port
*ap
)
1365 unsigned int classes
[ATA_MAX_DEVICES
];
1366 int tries
[ATA_MAX_DEVICES
];
1367 int i
, rc
, down_xfermask
;
1368 struct ata_device
*dev
;
1372 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1373 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1378 /* reset and determine device classes */
1379 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1380 classes
[i
] = ATA_DEV_UNKNOWN
;
1382 if (ap
->ops
->probe_reset
) {
1383 rc
= ap
->ops
->probe_reset(ap
, classes
);
1385 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1389 ap
->ops
->phy_reset(ap
);
1391 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1392 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1393 classes
[i
] = ap
->device
[i
].class;
1394 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1400 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1401 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1402 classes
[i
] = ATA_DEV_NONE
;
1404 /* read IDENTIFY page and configure devices */
1405 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1406 dev
= &ap
->device
[i
];
1409 dev
->class = classes
[i
];
1411 if (!ata_dev_enabled(dev
))
1414 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1418 rc
= ata_dev_configure(dev
, 1);
1423 /* configure transfer mode */
1424 rc
= ata_set_mode(ap
, &dev
);
1430 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1431 if (ata_dev_enabled(&ap
->device
[i
]))
1434 /* no device present, disable port */
1435 ata_port_disable(ap
);
1436 ap
->ops
->port_disable(ap
);
1443 tries
[dev
->devno
] = 0;
1446 sata_down_spd_limit(ap
);
1449 tries
[dev
->devno
]--;
1450 if (down_xfermask
&&
1451 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1452 tries
[dev
->devno
] = 0;
1455 if (!tries
[dev
->devno
]) {
1456 ata_down_xfermask_limit(dev
, 1);
1457 ata_dev_disable(dev
);
1464 * ata_port_probe - Mark port as enabled
1465 * @ap: Port for which we indicate enablement
1467 * Modify @ap data structure such that the system
1468 * thinks that the entire port is enabled.
1470 * LOCKING: host_set lock, or some other form of
1474 void ata_port_probe(struct ata_port
*ap
)
1476 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1480 * sata_print_link_status - Print SATA link status
1481 * @ap: SATA port to printk link status about
1483 * This function prints link speed and status of a SATA link.
1488 static void sata_print_link_status(struct ata_port
*ap
)
1490 u32 sstatus
, scontrol
, tmp
;
1492 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1494 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1496 if (ata_port_online(ap
)) {
1497 tmp
= (sstatus
>> 4) & 0xf;
1499 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1500 ap
->id
, sata_spd_string(tmp
), sstatus
, scontrol
);
1503 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1504 ap
->id
, sstatus
, scontrol
);
1509 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1510 * @ap: SATA port associated with target SATA PHY.
1512 * This function issues commands to standard SATA Sxxx
1513 * PHY registers, to wake up the phy (and device), and
1514 * clear any reset condition.
1517 * PCI/etc. bus probe sem.
1520 void __sata_phy_reset(struct ata_port
*ap
)
1523 unsigned long timeout
= jiffies
+ (HZ
* 5);
1525 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1526 /* issue phy wake/reset */
1527 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1528 /* Couldn't find anything in SATA I/II specs, but
1529 * AHCI-1.1 10.4.2 says at least 1 ms. */
1532 /* phy wake/clear reset */
1533 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1535 /* wait for phy to become ready, if necessary */
1538 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1539 if ((sstatus
& 0xf) != 1)
1541 } while (time_before(jiffies
, timeout
));
1543 /* print link status */
1544 sata_print_link_status(ap
);
1546 /* TODO: phy layer with polling, timeouts, etc. */
1547 if (!ata_port_offline(ap
))
1550 ata_port_disable(ap
);
1552 if (ap
->flags
& ATA_FLAG_DISABLED
)
1555 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1556 ata_port_disable(ap
);
1560 ap
->cbl
= ATA_CBL_SATA
;
1564 * sata_phy_reset - Reset SATA bus.
1565 * @ap: SATA port associated with target SATA PHY.
1567 * This function resets the SATA bus, and then probes
1568 * the bus for devices.
1571 * PCI/etc. bus probe sem.
1574 void sata_phy_reset(struct ata_port
*ap
)
1576 __sata_phy_reset(ap
);
1577 if (ap
->flags
& ATA_FLAG_DISABLED
)
1583 * ata_dev_pair - return other device on cable
1586 * Obtain the other device on the same cable, or if none is
1587 * present NULL is returned
1590 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1592 struct ata_port
*ap
= adev
->ap
;
1593 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1594 if (!ata_dev_enabled(pair
))
1600 * ata_port_disable - Disable port.
1601 * @ap: Port to be disabled.
1603 * Modify @ap data structure such that the system
1604 * thinks that the entire port is disabled, and should
1605 * never attempt to probe or communicate with devices
1608 * LOCKING: host_set lock, or some other form of
1612 void ata_port_disable(struct ata_port
*ap
)
1614 ap
->device
[0].class = ATA_DEV_NONE
;
1615 ap
->device
[1].class = ATA_DEV_NONE
;
1616 ap
->flags
|= ATA_FLAG_DISABLED
;
1620 * sata_down_spd_limit - adjust SATA spd limit downward
1621 * @ap: Port to adjust SATA spd limit for
1623 * Adjust SATA spd limit of @ap downward. Note that this
1624 * function only adjusts the limit. The change must be applied
1625 * using sata_set_spd().
1628 * Inherited from caller.
1631 * 0 on success, negative errno on failure
1633 int sata_down_spd_limit(struct ata_port
*ap
)
1635 u32 sstatus
, spd
, mask
;
1638 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1642 mask
= ap
->sata_spd_limit
;
1645 highbit
= fls(mask
) - 1;
1646 mask
&= ~(1 << highbit
);
1648 spd
= (sstatus
>> 4) & 0xf;
1652 mask
&= (1 << spd
) - 1;
1656 ap
->sata_spd_limit
= mask
;
1658 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1659 ap
->id
, sata_spd_string(fls(mask
)));
1664 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1668 if (ap
->sata_spd_limit
== UINT_MAX
)
1671 limit
= fls(ap
->sata_spd_limit
);
1673 spd
= (*scontrol
>> 4) & 0xf;
1674 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1676 return spd
!= limit
;
1680 * sata_set_spd_needed - is SATA spd configuration needed
1681 * @ap: Port in question
1683 * Test whether the spd limit in SControl matches
1684 * @ap->sata_spd_limit. This function is used to determine
1685 * whether hardreset is necessary to apply SATA spd
1689 * Inherited from caller.
1692 * 1 if SATA spd configuration is needed, 0 otherwise.
1694 int sata_set_spd_needed(struct ata_port
*ap
)
1698 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1701 return __sata_set_spd_needed(ap
, &scontrol
);
1705 * sata_set_spd - set SATA spd according to spd limit
1706 * @ap: Port to set SATA spd for
1708 * Set SATA spd of @ap according to sata_spd_limit.
1711 * Inherited from caller.
1714 * 0 if spd doesn't need to be changed, 1 if spd has been
1715 * changed. Negative errno if SCR registers are inaccessible.
1717 int sata_set_spd(struct ata_port
*ap
)
1722 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1725 if (!__sata_set_spd_needed(ap
, &scontrol
))
1728 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1735 * This mode timing computation functionality is ported over from
1736 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1739 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1740 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1741 * for PIO 5, which is a nonstandard extension and UDMA6, which
1742 * is currently supported only by Maxtor drives.
1745 static const struct ata_timing ata_timing
[] = {
1747 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1748 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1749 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1750 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1752 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1753 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1754 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1756 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1758 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1759 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1760 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1762 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1763 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1764 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1766 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1767 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1768 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1770 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1771 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1772 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1774 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1779 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1780 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1782 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1784 q
->setup
= EZ(t
->setup
* 1000, T
);
1785 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1786 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1787 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1788 q
->active
= EZ(t
->active
* 1000, T
);
1789 q
->recover
= EZ(t
->recover
* 1000, T
);
1790 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1791 q
->udma
= EZ(t
->udma
* 1000, UT
);
1794 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1795 struct ata_timing
*m
, unsigned int what
)
1797 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1798 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1799 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1800 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1801 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1802 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1803 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1804 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1807 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1809 const struct ata_timing
*t
;
1811 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1812 if (t
->mode
== 0xFF)
1817 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1818 struct ata_timing
*t
, int T
, int UT
)
1820 const struct ata_timing
*s
;
1821 struct ata_timing p
;
1827 if (!(s
= ata_timing_find_mode(speed
)))
1830 memcpy(t
, s
, sizeof(*s
));
1833 * If the drive is an EIDE drive, it can tell us it needs extended
1834 * PIO/MW_DMA cycle timing.
1837 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1838 memset(&p
, 0, sizeof(p
));
1839 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1840 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1841 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1842 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1843 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1845 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1849 * Convert the timing to bus clock counts.
1852 ata_timing_quantize(t
, t
, T
, UT
);
1855 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1856 * S.M.A.R.T * and some other commands. We have to ensure that the
1857 * DMA cycle timing is slower/equal than the fastest PIO timing.
1860 if (speed
> XFER_PIO_4
) {
1861 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1862 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1866 * Lengthen active & recovery time so that cycle time is correct.
1869 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1870 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1871 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1874 if (t
->active
+ t
->recover
< t
->cycle
) {
1875 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1876 t
->recover
= t
->cycle
- t
->active
;
1883 * ata_down_xfermask_limit - adjust dev xfer masks downward
1884 * @dev: Device to adjust xfer masks
1885 * @force_pio0: Force PIO0
1887 * Adjust xfer masks of @dev downward. Note that this function
1888 * does not apply the change. Invoking ata_set_mode() afterwards
1889 * will apply the limit.
1892 * Inherited from caller.
1895 * 0 on success, negative errno on failure
1897 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1899 struct ata_port
*ap
= dev
->ap
;
1900 unsigned long xfer_mask
;
1903 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1908 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1909 if (xfer_mask
& ATA_MASK_UDMA
)
1910 xfer_mask
&= ~ATA_MASK_MWDMA
;
1912 highbit
= fls(xfer_mask
) - 1;
1913 xfer_mask
&= ~(1 << highbit
);
1915 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1919 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1922 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1923 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1931 static int ata_dev_set_mode(struct ata_device
*dev
)
1933 struct ata_port
*ap
= dev
->ap
;
1934 unsigned int err_mask
;
1937 dev
->flags
&= ~ATA_DFLAG_PIO
;
1938 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1939 dev
->flags
|= ATA_DFLAG_PIO
;
1941 err_mask
= ata_dev_set_xfermode(dev
);
1944 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1949 rc
= ata_dev_revalidate(dev
, 0);
1953 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1954 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1956 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1958 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1963 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1964 * @ap: port on which timings will be programmed
1965 * @r_failed_dev: out paramter for failed device
1967 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1968 * ata_set_mode() fails, pointer to the failing device is
1969 * returned in @r_failed_dev.
1972 * PCI/etc. bus probe sem.
1975 * 0 on success, negative errno otherwise
1977 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1979 struct ata_device
*dev
;
1980 int i
, rc
= 0, used_dma
= 0, found
= 0;
1982 /* has private set_mode? */
1983 if (ap
->ops
->set_mode
) {
1984 /* FIXME: make ->set_mode handle no device case and
1985 * return error code and failing device on failure.
1987 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1988 if (ata_dev_enabled(&ap
->device
[i
])) {
1989 ap
->ops
->set_mode(ap
);
1996 /* step 1: calculate xfer_mask */
1997 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1998 unsigned int pio_mask
, dma_mask
;
2000 dev
= &ap
->device
[i
];
2002 if (!ata_dev_enabled(dev
))
2005 ata_dev_xfermask(dev
);
2007 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2008 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2009 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2010 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2019 /* step 2: always set host PIO timings */
2020 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2021 dev
= &ap
->device
[i
];
2022 if (!ata_dev_enabled(dev
))
2025 if (!dev
->pio_mode
) {
2026 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2027 ap
->id
, dev
->devno
);
2032 dev
->xfer_mode
= dev
->pio_mode
;
2033 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2034 if (ap
->ops
->set_piomode
)
2035 ap
->ops
->set_piomode(ap
, dev
);
2038 /* step 3: set host DMA timings */
2039 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2040 dev
= &ap
->device
[i
];
2042 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2045 dev
->xfer_mode
= dev
->dma_mode
;
2046 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2047 if (ap
->ops
->set_dmamode
)
2048 ap
->ops
->set_dmamode(ap
, dev
);
2051 /* step 4: update devices' xfer mode */
2052 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2053 dev
= &ap
->device
[i
];
2055 if (!ata_dev_enabled(dev
))
2058 rc
= ata_dev_set_mode(dev
);
2063 /* Record simplex status. If we selected DMA then the other
2064 * host channels are not permitted to do so.
2066 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2067 ap
->host_set
->simplex_claimed
= 1;
2069 /* step5: chip specific finalisation */
2070 if (ap
->ops
->post_set_mode
)
2071 ap
->ops
->post_set_mode(ap
);
2075 *r_failed_dev
= dev
;
2080 * ata_tf_to_host - issue ATA taskfile to host controller
2081 * @ap: port to which command is being issued
2082 * @tf: ATA taskfile register set
2084 * Issues ATA taskfile register set to ATA host controller,
2085 * with proper synchronization with interrupt handler and
2089 * spin_lock_irqsave(host_set lock)
2092 static inline void ata_tf_to_host(struct ata_port
*ap
,
2093 const struct ata_taskfile
*tf
)
2095 ap
->ops
->tf_load(ap
, tf
);
2096 ap
->ops
->exec_command(ap
, tf
);
2100 * ata_busy_sleep - sleep until BSY clears, or timeout
2101 * @ap: port containing status register to be polled
2102 * @tmout_pat: impatience timeout
2103 * @tmout: overall timeout
2105 * Sleep until ATA Status register bit BSY clears,
2106 * or a timeout occurs.
2111 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2112 unsigned long tmout_pat
, unsigned long tmout
)
2114 unsigned long timer_start
, timeout
;
2117 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2118 timer_start
= jiffies
;
2119 timeout
= timer_start
+ tmout_pat
;
2120 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2122 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2125 if (status
& ATA_BUSY
)
2126 printk(KERN_WARNING
"ata%u is slow to respond, "
2127 "please be patient\n", ap
->id
);
2129 timeout
= timer_start
+ tmout
;
2130 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2132 status
= ata_chk_status(ap
);
2135 if (status
& ATA_BUSY
) {
2136 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2137 ap
->id
, tmout
/ HZ
);
2144 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2146 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2147 unsigned int dev0
= devmask
& (1 << 0);
2148 unsigned int dev1
= devmask
& (1 << 1);
2149 unsigned long timeout
;
2151 /* if device 0 was found in ata_devchk, wait for its
2155 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2157 /* if device 1 was found in ata_devchk, wait for
2158 * register access, then wait for BSY to clear
2160 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2164 ap
->ops
->dev_select(ap
, 1);
2165 if (ap
->flags
& ATA_FLAG_MMIO
) {
2166 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2167 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2169 nsect
= inb(ioaddr
->nsect_addr
);
2170 lbal
= inb(ioaddr
->lbal_addr
);
2172 if ((nsect
== 1) && (lbal
== 1))
2174 if (time_after(jiffies
, timeout
)) {
2178 msleep(50); /* give drive a breather */
2181 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2183 /* is all this really necessary? */
2184 ap
->ops
->dev_select(ap
, 0);
2186 ap
->ops
->dev_select(ap
, 1);
2188 ap
->ops
->dev_select(ap
, 0);
2191 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2192 unsigned int devmask
)
2194 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2196 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2198 /* software reset. causes dev0 to be selected */
2199 if (ap
->flags
& ATA_FLAG_MMIO
) {
2200 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2201 udelay(20); /* FIXME: flush */
2202 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2203 udelay(20); /* FIXME: flush */
2204 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2206 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2208 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2210 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2213 /* spec mandates ">= 2ms" before checking status.
2214 * We wait 150ms, because that was the magic delay used for
2215 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2216 * between when the ATA command register is written, and then
2217 * status is checked. Because waiting for "a while" before
2218 * checking status is fine, post SRST, we perform this magic
2219 * delay here as well.
2221 * Old drivers/ide uses the 2mS rule and then waits for ready
2225 /* Before we perform post reset processing we want to see if
2226 * the bus shows 0xFF because the odd clown forgets the D7
2227 * pulldown resistor.
2229 if (ata_check_status(ap
) == 0xFF) {
2230 printk(KERN_ERR
"ata%u: SRST failed (status 0xFF)\n", ap
->id
);
2231 return AC_ERR_OTHER
;
2234 ata_bus_post_reset(ap
, devmask
);
2240 * ata_bus_reset - reset host port and associated ATA channel
2241 * @ap: port to reset
2243 * This is typically the first time we actually start issuing
2244 * commands to the ATA channel. We wait for BSY to clear, then
2245 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2246 * result. Determine what devices, if any, are on the channel
2247 * by looking at the device 0/1 error register. Look at the signature
2248 * stored in each device's taskfile registers, to determine if
2249 * the device is ATA or ATAPI.
2252 * PCI/etc. bus probe sem.
2253 * Obtains host_set lock.
2256 * Sets ATA_FLAG_DISABLED if bus reset fails.
2259 void ata_bus_reset(struct ata_port
*ap
)
2261 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2262 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2264 unsigned int dev0
, dev1
= 0, devmask
= 0;
2266 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2268 /* determine if device 0/1 are present */
2269 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2272 dev0
= ata_devchk(ap
, 0);
2274 dev1
= ata_devchk(ap
, 1);
2278 devmask
|= (1 << 0);
2280 devmask
|= (1 << 1);
2282 /* select device 0 again */
2283 ap
->ops
->dev_select(ap
, 0);
2285 /* issue bus reset */
2286 if (ap
->flags
& ATA_FLAG_SRST
)
2287 if (ata_bus_softreset(ap
, devmask
))
2291 * determine by signature whether we have ATA or ATAPI devices
2293 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2294 if ((slave_possible
) && (err
!= 0x81))
2295 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2297 /* re-enable interrupts */
2298 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2301 /* is double-select really necessary? */
2302 if (ap
->device
[1].class != ATA_DEV_NONE
)
2303 ap
->ops
->dev_select(ap
, 1);
2304 if (ap
->device
[0].class != ATA_DEV_NONE
)
2305 ap
->ops
->dev_select(ap
, 0);
2307 /* if no devices were detected, disable this port */
2308 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2309 (ap
->device
[1].class == ATA_DEV_NONE
))
2312 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2313 /* set up device control for ATA_FLAG_SATA_RESET */
2314 if (ap
->flags
& ATA_FLAG_MMIO
)
2315 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2317 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2324 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2325 ap
->ops
->port_disable(ap
);
2330 static int sata_phy_resume(struct ata_port
*ap
)
2332 unsigned long timeout
= jiffies
+ (HZ
* 5);
2333 u32 scontrol
, sstatus
;
2336 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2339 scontrol
= (scontrol
& 0x0f0) | 0x300;
2341 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2344 /* Wait for phy to become ready, if necessary. */
2347 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2349 if ((sstatus
& 0xf) != 1)
2351 } while (time_before(jiffies
, timeout
));
2357 * ata_std_probeinit - initialize probing
2358 * @ap: port to be probed
2360 * @ap is about to be probed. Initialize it. This function is
2361 * to be used as standard callback for ata_drive_probe_reset().
2363 * NOTE!!! Do not use this function as probeinit if a low level
2364 * driver implements only hardreset. Just pass NULL as probeinit
2365 * in that case. Using this function is probably okay but doing
2366 * so makes reset sequence different from the original
2367 * ->phy_reset implementation and Jeff nervous. :-P
2369 void ata_std_probeinit(struct ata_port
*ap
)
2374 sata_phy_resume(ap
);
2376 /* init sata_spd_limit to the current value */
2377 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2378 int spd
= (scontrol
>> 4) & 0xf;
2379 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2382 /* wait for device */
2383 if (ata_port_online(ap
))
2384 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2388 * ata_std_softreset - reset host port via ATA SRST
2389 * @ap: port to reset
2390 * @classes: resulting classes of attached devices
2392 * Reset host port using ATA SRST. This function is to be used
2393 * as standard callback for ata_drive_*_reset() functions.
2396 * Kernel thread context (may sleep)
2399 * 0 on success, -errno otherwise.
2401 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2403 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2404 unsigned int devmask
= 0, err_mask
;
2409 if (ata_port_offline(ap
)) {
2410 classes
[0] = ATA_DEV_NONE
;
2414 /* determine if device 0/1 are present */
2415 if (ata_devchk(ap
, 0))
2416 devmask
|= (1 << 0);
2417 if (slave_possible
&& ata_devchk(ap
, 1))
2418 devmask
|= (1 << 1);
2420 /* select device 0 again */
2421 ap
->ops
->dev_select(ap
, 0);
2423 /* issue bus reset */
2424 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2425 err_mask
= ata_bus_softreset(ap
, devmask
);
2427 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2432 /* determine by signature whether we have ATA or ATAPI devices */
2433 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2434 if (slave_possible
&& err
!= 0x81)
2435 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2438 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2443 * sata_std_hardreset - reset host port via SATA phy reset
2444 * @ap: port to reset
2445 * @class: resulting class of attached device
2447 * SATA phy-reset host port using DET bits of SControl register.
2448 * This function is to be used as standard callback for
2449 * ata_drive_*_reset().
2452 * Kernel thread context (may sleep)
2455 * 0 on success, -errno otherwise.
2457 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2464 if (sata_set_spd_needed(ap
)) {
2465 /* SATA spec says nothing about how to reconfigure
2466 * spd. To be on the safe side, turn off phy during
2467 * reconfiguration. This works for at least ICH7 AHCI
2470 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2473 scontrol
= (scontrol
& 0x0f0) | 0x302;
2475 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2481 /* issue phy wake/reset */
2482 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2485 scontrol
= (scontrol
& 0x0f0) | 0x301;
2487 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2490 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2491 * 10.4.2 says at least 1 ms.
2495 /* bring phy back */
2496 sata_phy_resume(ap
);
2498 /* TODO: phy layer with polling, timeouts, etc. */
2499 if (ata_port_offline(ap
)) {
2500 *class = ATA_DEV_NONE
;
2501 DPRINTK("EXIT, link offline\n");
2505 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2507 "ata%u: COMRESET failed (device not ready)\n", ap
->id
);
2511 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2513 *class = ata_dev_try_classify(ap
, 0, NULL
);
2515 DPRINTK("EXIT, class=%u\n", *class);
2520 * ata_std_postreset - standard postreset callback
2521 * @ap: the target ata_port
2522 * @classes: classes of attached devices
2524 * This function is invoked after a successful reset. Note that
2525 * the device might have been reset more than once using
2526 * different reset methods before postreset is invoked.
2528 * This function is to be used as standard callback for
2529 * ata_drive_*_reset().
2532 * Kernel thread context (may sleep)
2534 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2538 /* print link status */
2539 sata_print_link_status(ap
);
2541 /* re-enable interrupts */
2542 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2545 /* is double-select really necessary? */
2546 if (classes
[0] != ATA_DEV_NONE
)
2547 ap
->ops
->dev_select(ap
, 1);
2548 if (classes
[1] != ATA_DEV_NONE
)
2549 ap
->ops
->dev_select(ap
, 0);
2551 /* bail out if no device is present */
2552 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2553 DPRINTK("EXIT, no device\n");
2557 /* set up device control */
2558 if (ap
->ioaddr
.ctl_addr
) {
2559 if (ap
->flags
& ATA_FLAG_MMIO
)
2560 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2562 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2569 * ata_std_probe_reset - standard probe reset method
2570 * @ap: prot to perform probe-reset
2571 * @classes: resulting classes of attached devices
2573 * The stock off-the-shelf ->probe_reset method.
2576 * Kernel thread context (may sleep)
2579 * 0 on success, -errno otherwise.
2581 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2583 ata_reset_fn_t hardreset
;
2586 if (sata_scr_valid(ap
))
2587 hardreset
= sata_std_hardreset
;
2589 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2590 ata_std_softreset
, hardreset
,
2591 ata_std_postreset
, classes
);
2594 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2595 unsigned int *classes
)
2599 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2600 classes
[i
] = ATA_DEV_UNKNOWN
;
2602 rc
= reset(ap
, classes
);
2606 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2607 * is complete and convert all ATA_DEV_UNKNOWN to
2610 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2611 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2614 if (i
< ATA_MAX_DEVICES
)
2615 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2616 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2617 classes
[i
] = ATA_DEV_NONE
;
2623 * ata_drive_probe_reset - Perform probe reset with given methods
2624 * @ap: port to reset
2625 * @probeinit: probeinit method (can be NULL)
2626 * @softreset: softreset method (can be NULL)
2627 * @hardreset: hardreset method (can be NULL)
2628 * @postreset: postreset method (can be NULL)
2629 * @classes: resulting classes of attached devices
2631 * Reset the specified port and classify attached devices using
2632 * given methods. This function prefers softreset but tries all
2633 * possible reset sequences to reset and classify devices. This
2634 * function is intended to be used for constructing ->probe_reset
2635 * callback by low level drivers.
2637 * Reset methods should follow the following rules.
2639 * - Return 0 on sucess, -errno on failure.
2640 * - If classification is supported, fill classes[] with
2641 * recognized class codes.
2642 * - If classification is not supported, leave classes[] alone.
2645 * Kernel thread context (may sleep)
2648 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2649 * if classification fails, and any error code from reset
2652 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2653 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2654 ata_postreset_fn_t postreset
, unsigned int *classes
)
2661 if (softreset
&& !sata_set_spd_needed(ap
)) {
2662 rc
= ata_do_reset(ap
, softreset
, classes
);
2663 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2665 printk(KERN_INFO
"ata%u: softreset failed, will try "
2666 "hardreset in 5 secs\n", ap
->id
);
2674 rc
= ata_do_reset(ap
, hardreset
, classes
);
2676 if (classes
[0] != ATA_DEV_UNKNOWN
)
2681 if (sata_down_spd_limit(ap
))
2684 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2685 "in 5 secs\n", ap
->id
);
2690 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2691 "classification, will retry softreset in 5 secs\n",
2695 rc
= ata_do_reset(ap
, softreset
, classes
);
2701 postreset(ap
, classes
);
2702 if (classes
[0] == ATA_DEV_UNKNOWN
)
2709 * ata_dev_same_device - Determine whether new ID matches configured device
2710 * @dev: device to compare against
2711 * @new_class: class of the new device
2712 * @new_id: IDENTIFY page of the new device
2714 * Compare @new_class and @new_id against @dev and determine
2715 * whether @dev is the device indicated by @new_class and
2722 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2724 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2727 struct ata_port
*ap
= dev
->ap
;
2728 const u16
*old_id
= dev
->id
;
2729 unsigned char model
[2][41], serial
[2][21];
2732 if (dev
->class != new_class
) {
2734 "ata%u: dev %u class mismatch %d != %d\n",
2735 ap
->id
, dev
->devno
, dev
->class, new_class
);
2739 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2740 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2741 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2742 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2743 new_n_sectors
= ata_id_n_sectors(new_id
);
2745 if (strcmp(model
[0], model
[1])) {
2747 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2748 ap
->id
, dev
->devno
, model
[0], model
[1]);
2752 if (strcmp(serial
[0], serial
[1])) {
2754 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2755 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2759 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2761 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2762 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2763 (unsigned long long)new_n_sectors
);
2771 * ata_dev_revalidate - Revalidate ATA device
2772 * @dev: device to revalidate
2773 * @post_reset: is this revalidation after reset?
2775 * Re-read IDENTIFY page and make sure @dev is still attached to
2779 * Kernel thread context (may sleep)
2782 * 0 on success, negative errno otherwise
2784 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2786 struct ata_port
*ap
= dev
->ap
;
2787 unsigned int class = dev
->class;
2788 u16
*id
= (void *)ap
->sector_buf
;
2791 if (!ata_dev_enabled(dev
)) {
2797 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2801 /* is the device still there? */
2802 if (!ata_dev_same_device(dev
, class, id
)) {
2807 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2809 /* configure device according to the new ID */
2810 rc
= ata_dev_configure(dev
, 0);
2815 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2816 ap
->id
, dev
->devno
, rc
);
2820 static const char * const ata_dma_blacklist
[] = {
2821 "WDC AC11000H", NULL
,
2822 "WDC AC22100H", NULL
,
2823 "WDC AC32500H", NULL
,
2824 "WDC AC33100H", NULL
,
2825 "WDC AC31600H", NULL
,
2826 "WDC AC32100H", "24.09P07",
2827 "WDC AC23200L", "21.10N21",
2828 "Compaq CRD-8241B", NULL
,
2833 "SanDisk SDP3B", NULL
,
2834 "SanDisk SDP3B-64", NULL
,
2835 "SANYO CD-ROM CRD", NULL
,
2836 "HITACHI CDR-8", NULL
,
2837 "HITACHI CDR-8335", NULL
,
2838 "HITACHI CDR-8435", NULL
,
2839 "Toshiba CD-ROM XM-6202B", NULL
,
2840 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2842 "E-IDE CD-ROM CR-840", NULL
,
2843 "CD-ROM Drive/F5A", NULL
,
2844 "WPI CDD-820", NULL
,
2845 "SAMSUNG CD-ROM SC-148C", NULL
,
2846 "SAMSUNG CD-ROM SC", NULL
,
2847 "SanDisk SDP3B-64", NULL
,
2848 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2849 "_NEC DV5800A", NULL
,
2850 "SAMSUNG CD-ROM SN-124", "N001"
2853 static int ata_strim(char *s
, size_t len
)
2855 len
= strnlen(s
, len
);
2857 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2858 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2865 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2867 unsigned char model_num
[40];
2868 unsigned char model_rev
[16];
2869 unsigned int nlen
, rlen
;
2872 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2874 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2876 nlen
= ata_strim(model_num
, sizeof(model_num
));
2877 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2879 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2880 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2881 if (ata_dma_blacklist
[i
+1] == NULL
)
2883 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2891 * ata_dev_xfermask - Compute supported xfermask of the given device
2892 * @dev: Device to compute xfermask for
2894 * Compute supported xfermask of @dev and store it in
2895 * dev->*_mask. This function is responsible for applying all
2896 * known limits including host controller limits, device
2899 * FIXME: The current implementation limits all transfer modes to
2900 * the fastest of the lowested device on the port. This is not
2901 * required on most controllers.
2906 static void ata_dev_xfermask(struct ata_device
*dev
)
2908 struct ata_port
*ap
= dev
->ap
;
2909 struct ata_host_set
*hs
= ap
->host_set
;
2910 unsigned long xfer_mask
;
2913 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2914 ap
->mwdma_mask
, ap
->udma_mask
);
2916 /* Apply cable rule here. Don't apply it early because when
2917 * we handle hot plug the cable type can itself change.
2919 if (ap
->cbl
== ATA_CBL_PATA40
)
2920 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2922 /* FIXME: Use port-wide xfermask for now */
2923 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2924 struct ata_device
*d
= &ap
->device
[i
];
2926 if (ata_dev_absent(d
))
2929 if (ata_dev_disabled(d
)) {
2930 /* to avoid violating device selection timing */
2931 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2932 UINT_MAX
, UINT_MAX
);
2936 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2937 d
->mwdma_mask
, d
->udma_mask
);
2938 xfer_mask
&= ata_id_xfermask(d
->id
);
2939 if (ata_dma_blacklisted(d
))
2940 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2943 if (ata_dma_blacklisted(dev
))
2944 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2945 "disabling DMA\n", ap
->id
, dev
->devno
);
2947 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2948 if (hs
->simplex_claimed
)
2949 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2952 if (ap
->ops
->mode_filter
)
2953 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2955 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2956 &dev
->mwdma_mask
, &dev
->udma_mask
);
2960 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2961 * @dev: Device to which command will be sent
2963 * Issue SET FEATURES - XFER MODE command to device @dev
2967 * PCI/etc. bus probe sem.
2970 * 0 on success, AC_ERR_* mask otherwise.
2973 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
2975 struct ata_taskfile tf
;
2976 unsigned int err_mask
;
2978 /* set up set-features taskfile */
2979 DPRINTK("set features - xfer mode\n");
2981 ata_tf_init(dev
, &tf
);
2982 tf
.command
= ATA_CMD_SET_FEATURES
;
2983 tf
.feature
= SETFEATURES_XFER
;
2984 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2985 tf
.protocol
= ATA_PROT_NODATA
;
2986 tf
.nsect
= dev
->xfer_mode
;
2988 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
2990 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2995 * ata_dev_init_params - Issue INIT DEV PARAMS command
2996 * @dev: Device to which command will be sent
2997 * @heads: Number of heads
2998 * @sectors: Number of sectors
3001 * Kernel thread context (may sleep)
3004 * 0 on success, AC_ERR_* mask otherwise.
3006 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3007 u16 heads
, u16 sectors
)
3009 struct ata_taskfile tf
;
3010 unsigned int err_mask
;
3012 /* Number of sectors per track 1-255. Number of heads 1-16 */
3013 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3014 return AC_ERR_INVALID
;
3016 /* set up init dev params taskfile */
3017 DPRINTK("init dev params \n");
3019 ata_tf_init(dev
, &tf
);
3020 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3021 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3022 tf
.protocol
= ATA_PROT_NODATA
;
3024 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3026 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3028 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3033 * ata_sg_clean - Unmap DMA memory associated with command
3034 * @qc: Command containing DMA memory to be released
3036 * Unmap all mapped DMA memory associated with this command.
3039 * spin_lock_irqsave(host_set lock)
3042 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3044 struct ata_port
*ap
= qc
->ap
;
3045 struct scatterlist
*sg
= qc
->__sg
;
3046 int dir
= qc
->dma_dir
;
3047 void *pad_buf
= NULL
;
3049 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3050 WARN_ON(sg
== NULL
);
3052 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3053 WARN_ON(qc
->n_elem
> 1);
3055 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3057 /* if we padded the buffer out to 32-bit bound, and data
3058 * xfer direction is from-device, we must copy from the
3059 * pad buffer back into the supplied buffer
3061 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3062 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3064 if (qc
->flags
& ATA_QCFLAG_SG
) {
3066 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3067 /* restore last sg */
3068 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3070 struct scatterlist
*psg
= &qc
->pad_sgent
;
3071 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3072 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3073 kunmap_atomic(addr
, KM_IRQ0
);
3077 dma_unmap_single(ap
->dev
,
3078 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3081 sg
->length
+= qc
->pad_len
;
3083 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3084 pad_buf
, qc
->pad_len
);
3087 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3092 * ata_fill_sg - Fill PCI IDE PRD table
3093 * @qc: Metadata associated with taskfile to be transferred
3095 * Fill PCI IDE PRD (scatter-gather) table with segments
3096 * associated with the current disk command.
3099 * spin_lock_irqsave(host_set lock)
3102 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3104 struct ata_port
*ap
= qc
->ap
;
3105 struct scatterlist
*sg
;
3108 WARN_ON(qc
->__sg
== NULL
);
3109 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3112 ata_for_each_sg(sg
, qc
) {
3116 /* determine if physical DMA addr spans 64K boundary.
3117 * Note h/w doesn't support 64-bit, so we unconditionally
3118 * truncate dma_addr_t to u32.
3120 addr
= (u32
) sg_dma_address(sg
);
3121 sg_len
= sg_dma_len(sg
);
3124 offset
= addr
& 0xffff;
3126 if ((offset
+ sg_len
) > 0x10000)
3127 len
= 0x10000 - offset
;
3129 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3130 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3131 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3140 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3143 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3144 * @qc: Metadata associated with taskfile to check
3146 * Allow low-level driver to filter ATA PACKET commands, returning
3147 * a status indicating whether or not it is OK to use DMA for the
3148 * supplied PACKET command.
3151 * spin_lock_irqsave(host_set lock)
3153 * RETURNS: 0 when ATAPI DMA can be used
3156 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3158 struct ata_port
*ap
= qc
->ap
;
3159 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3161 if (ap
->ops
->check_atapi_dma
)
3162 rc
= ap
->ops
->check_atapi_dma(qc
);
3167 * ata_qc_prep - Prepare taskfile for submission
3168 * @qc: Metadata associated with taskfile to be prepared
3170 * Prepare ATA taskfile for submission.
3173 * spin_lock_irqsave(host_set lock)
3175 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3177 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3183 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3186 * ata_sg_init_one - Associate command with memory buffer
3187 * @qc: Command to be associated
3188 * @buf: Memory buffer
3189 * @buflen: Length of memory buffer, in bytes.
3191 * Initialize the data-related elements of queued_cmd @qc
3192 * to point to a single memory buffer, @buf of byte length @buflen.
3195 * spin_lock_irqsave(host_set lock)
3198 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3200 struct scatterlist
*sg
;
3202 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3204 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3205 qc
->__sg
= &qc
->sgent
;
3207 qc
->orig_n_elem
= 1;
3211 sg_init_one(sg
, buf
, buflen
);
3215 * ata_sg_init - Associate command with scatter-gather table.
3216 * @qc: Command to be associated
3217 * @sg: Scatter-gather table.
3218 * @n_elem: Number of elements in s/g table.
3220 * Initialize the data-related elements of queued_cmd @qc
3221 * to point to a scatter-gather table @sg, containing @n_elem
3225 * spin_lock_irqsave(host_set lock)
3228 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3229 unsigned int n_elem
)
3231 qc
->flags
|= ATA_QCFLAG_SG
;
3233 qc
->n_elem
= n_elem
;
3234 qc
->orig_n_elem
= n_elem
;
3238 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3239 * @qc: Command with memory buffer to be mapped.
3241 * DMA-map the memory buffer associated with queued_cmd @qc.
3244 * spin_lock_irqsave(host_set lock)
3247 * Zero on success, negative on error.
3250 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3252 struct ata_port
*ap
= qc
->ap
;
3253 int dir
= qc
->dma_dir
;
3254 struct scatterlist
*sg
= qc
->__sg
;
3255 dma_addr_t dma_address
;
3258 /* we must lengthen transfers to end on a 32-bit boundary */
3259 qc
->pad_len
= sg
->length
& 3;
3261 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3262 struct scatterlist
*psg
= &qc
->pad_sgent
;
3264 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3266 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3268 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3269 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3272 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3273 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3275 sg
->length
-= qc
->pad_len
;
3276 if (sg
->length
== 0)
3279 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3280 sg
->length
, qc
->pad_len
);
3288 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3290 if (dma_mapping_error(dma_address
)) {
3292 sg
->length
+= qc
->pad_len
;
3296 sg_dma_address(sg
) = dma_address
;
3297 sg_dma_len(sg
) = sg
->length
;
3300 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3301 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3307 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3308 * @qc: Command with scatter-gather table to be mapped.
3310 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3313 * spin_lock_irqsave(host_set lock)
3316 * Zero on success, negative on error.
3320 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3322 struct ata_port
*ap
= qc
->ap
;
3323 struct scatterlist
*sg
= qc
->__sg
;
3324 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3325 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3327 VPRINTK("ENTER, ata%u\n", ap
->id
);
3328 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3330 /* we must lengthen transfers to end on a 32-bit boundary */
3331 qc
->pad_len
= lsg
->length
& 3;
3333 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3334 struct scatterlist
*psg
= &qc
->pad_sgent
;
3335 unsigned int offset
;
3337 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3339 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3342 * psg->page/offset are used to copy to-be-written
3343 * data in this function or read data in ata_sg_clean.
3345 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3346 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3347 psg
->offset
= offset_in_page(offset
);
3349 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3350 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3351 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3352 kunmap_atomic(addr
, KM_IRQ0
);
3355 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3356 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3358 lsg
->length
-= qc
->pad_len
;
3359 if (lsg
->length
== 0)
3362 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3363 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3366 pre_n_elem
= qc
->n_elem
;
3367 if (trim_sg
&& pre_n_elem
)
3376 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3378 /* restore last sg */
3379 lsg
->length
+= qc
->pad_len
;
3383 DPRINTK("%d sg elements mapped\n", n_elem
);
3386 qc
->n_elem
= n_elem
;
3392 * ata_poll_qc_complete - turn irq back on and finish qc
3393 * @qc: Command to complete
3394 * @err_mask: ATA status register content
3397 * None. (grabs host lock)
3400 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3402 struct ata_port
*ap
= qc
->ap
;
3403 unsigned long flags
;
3405 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3406 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3408 ata_qc_complete(qc
);
3409 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3413 * ata_pio_poll - poll using PIO, depending on current state
3414 * @qc: qc in progress
3417 * None. (executing in kernel thread context)
3420 * timeout value to use
3422 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3424 struct ata_port
*ap
= qc
->ap
;
3426 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3427 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3429 switch (ap
->hsm_task_state
) {
3432 poll_state
= HSM_ST_POLL
;
3436 case HSM_ST_LAST_POLL
:
3437 poll_state
= HSM_ST_LAST_POLL
;
3438 reg_state
= HSM_ST_LAST
;
3445 status
= ata_chk_status(ap
);
3446 if (status
& ATA_BUSY
) {
3447 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3448 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3449 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3452 ap
->hsm_task_state
= poll_state
;
3453 return ATA_SHORT_PAUSE
;
3456 ap
->hsm_task_state
= reg_state
;
3461 * ata_pio_complete - check if drive is busy or idle
3462 * @qc: qc to complete
3465 * None. (executing in kernel thread context)
3468 * Non-zero if qc completed, zero otherwise.
3470 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3472 struct ata_port
*ap
= qc
->ap
;
3476 * This is purely heuristic. This is a fast path. Sometimes when
3477 * we enter, BSY will be cleared in a chk-status or two. If not,
3478 * the drive is probably seeking or something. Snooze for a couple
3479 * msecs, then chk-status again. If still busy, fall back to
3480 * HSM_ST_POLL state.
3482 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3483 if (drv_stat
& ATA_BUSY
) {
3485 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3486 if (drv_stat
& ATA_BUSY
) {
3487 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3488 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3493 drv_stat
= ata_wait_idle(ap
);
3494 if (!ata_ok(drv_stat
)) {
3495 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3496 ap
->hsm_task_state
= HSM_ST_ERR
;
3500 ap
->hsm_task_state
= HSM_ST_IDLE
;
3502 WARN_ON(qc
->err_mask
);
3503 ata_poll_qc_complete(qc
);
3505 /* another command may start at this point */
3512 * swap_buf_le16 - swap halves of 16-bit words in place
3513 * @buf: Buffer to swap
3514 * @buf_words: Number of 16-bit words in buffer.
3516 * Swap halves of 16-bit words if needed to convert from
3517 * little-endian byte order to native cpu byte order, or
3521 * Inherited from caller.
3523 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3528 for (i
= 0; i
< buf_words
; i
++)
3529 buf
[i
] = le16_to_cpu(buf
[i
]);
3530 #endif /* __BIG_ENDIAN */
3534 * ata_mmio_data_xfer - Transfer data by MMIO
3535 * @ap: port to read/write
3537 * @buflen: buffer length
3538 * @write_data: read/write
3540 * Transfer data from/to the device data register by MMIO.
3543 * Inherited from caller.
3546 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3547 unsigned int buflen
, int write_data
)
3550 unsigned int words
= buflen
>> 1;
3551 u16
*buf16
= (u16
*) buf
;
3552 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3554 /* Transfer multiple of 2 bytes */
3556 for (i
= 0; i
< words
; i
++)
3557 writew(le16_to_cpu(buf16
[i
]), mmio
);
3559 for (i
= 0; i
< words
; i
++)
3560 buf16
[i
] = cpu_to_le16(readw(mmio
));
3563 /* Transfer trailing 1 byte, if any. */
3564 if (unlikely(buflen
& 0x01)) {
3565 u16 align_buf
[1] = { 0 };
3566 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3569 memcpy(align_buf
, trailing_buf
, 1);
3570 writew(le16_to_cpu(align_buf
[0]), mmio
);
3572 align_buf
[0] = cpu_to_le16(readw(mmio
));
3573 memcpy(trailing_buf
, align_buf
, 1);
3579 * ata_pio_data_xfer - Transfer data by PIO
3580 * @ap: port to read/write
3582 * @buflen: buffer length
3583 * @write_data: read/write
3585 * Transfer data from/to the device data register by PIO.
3588 * Inherited from caller.
3591 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3592 unsigned int buflen
, int write_data
)
3594 unsigned int words
= buflen
>> 1;
3596 /* Transfer multiple of 2 bytes */
3598 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3600 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3602 /* Transfer trailing 1 byte, if any. */
3603 if (unlikely(buflen
& 0x01)) {
3604 u16 align_buf
[1] = { 0 };
3605 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3608 memcpy(align_buf
, trailing_buf
, 1);
3609 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3611 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3612 memcpy(trailing_buf
, align_buf
, 1);
3618 * ata_data_xfer - Transfer data from/to the data register.
3619 * @ap: port to read/write
3621 * @buflen: buffer length
3622 * @do_write: read/write
3624 * Transfer data from/to the device data register.
3627 * Inherited from caller.
3630 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3631 unsigned int buflen
, int do_write
)
3633 /* Make the crap hardware pay the costs not the good stuff */
3634 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3635 unsigned long flags
;
3636 local_irq_save(flags
);
3637 if (ap
->flags
& ATA_FLAG_MMIO
)
3638 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3640 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3641 local_irq_restore(flags
);
3643 if (ap
->flags
& ATA_FLAG_MMIO
)
3644 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3646 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3651 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3652 * @qc: Command on going
3654 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3657 * Inherited from caller.
3660 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3662 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3663 struct scatterlist
*sg
= qc
->__sg
;
3664 struct ata_port
*ap
= qc
->ap
;
3666 unsigned int offset
;
3669 if (qc
->cursect
== (qc
->nsect
- 1))
3670 ap
->hsm_task_state
= HSM_ST_LAST
;
3672 page
= sg
[qc
->cursg
].page
;
3673 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3675 /* get the current page and offset */
3676 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3677 offset
%= PAGE_SIZE
;
3679 buf
= kmap(page
) + offset
;
3684 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3689 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3691 /* do the actual data transfer */
3692 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3693 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3699 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3700 * @qc: Command on going
3701 * @bytes: number of bytes
3703 * Transfer Transfer data from/to the ATAPI device.
3706 * Inherited from caller.
3710 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3712 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3713 struct scatterlist
*sg
= qc
->__sg
;
3714 struct ata_port
*ap
= qc
->ap
;
3717 unsigned int offset
, count
;
3719 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3720 ap
->hsm_task_state
= HSM_ST_LAST
;
3723 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3725 * The end of qc->sg is reached and the device expects
3726 * more data to transfer. In order not to overrun qc->sg
3727 * and fulfill length specified in the byte count register,
3728 * - for read case, discard trailing data from the device
3729 * - for write case, padding zero data to the device
3731 u16 pad_buf
[1] = { 0 };
3732 unsigned int words
= bytes
>> 1;
3735 if (words
) /* warning if bytes > 1 */
3736 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3739 for (i
= 0; i
< words
; i
++)
3740 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3742 ap
->hsm_task_state
= HSM_ST_LAST
;
3746 sg
= &qc
->__sg
[qc
->cursg
];
3749 offset
= sg
->offset
+ qc
->cursg_ofs
;
3751 /* get the current page and offset */
3752 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3753 offset
%= PAGE_SIZE
;
3755 /* don't overrun current sg */
3756 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3758 /* don't cross page boundaries */
3759 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3761 buf
= kmap(page
) + offset
;
3764 qc
->curbytes
+= count
;
3765 qc
->cursg_ofs
+= count
;
3767 if (qc
->cursg_ofs
== sg
->length
) {
3772 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3774 /* do the actual data transfer */
3775 ata_data_xfer(ap
, buf
, count
, do_write
);
3784 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3785 * @qc: Command on going
3787 * Transfer Transfer data from/to the ATAPI device.
3790 * Inherited from caller.
3793 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3795 struct ata_port
*ap
= qc
->ap
;
3796 struct ata_device
*dev
= qc
->dev
;
3797 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3798 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3800 ap
->ops
->tf_read(ap
, &qc
->tf
);
3801 ireason
= qc
->tf
.nsect
;
3802 bc_lo
= qc
->tf
.lbam
;
3803 bc_hi
= qc
->tf
.lbah
;
3804 bytes
= (bc_hi
<< 8) | bc_lo
;
3806 /* shall be cleared to zero, indicating xfer of data */
3807 if (ireason
& (1 << 0))
3810 /* make sure transfer direction matches expected */
3811 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3812 if (do_write
!= i_write
)
3815 __atapi_pio_bytes(qc
, bytes
);
3820 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3821 ap
->id
, dev
->devno
);
3822 qc
->err_mask
|= AC_ERR_HSM
;
3823 ap
->hsm_task_state
= HSM_ST_ERR
;
3827 * ata_pio_block - start PIO on a block
3828 * @qc: qc to transfer block for
3831 * None. (executing in kernel thread context)
3833 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3835 struct ata_port
*ap
= qc
->ap
;
3839 * This is purely heuristic. This is a fast path.
3840 * Sometimes when we enter, BSY will be cleared in
3841 * a chk-status or two. If not, the drive is probably seeking
3842 * or something. Snooze for a couple msecs, then
3843 * chk-status again. If still busy, fall back to
3844 * HSM_ST_POLL state.
3846 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3847 if (status
& ATA_BUSY
) {
3849 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3850 if (status
& ATA_BUSY
) {
3851 ap
->hsm_task_state
= HSM_ST_POLL
;
3852 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3858 if (status
& (ATA_ERR
| ATA_DF
)) {
3859 qc
->err_mask
|= AC_ERR_DEV
;
3860 ap
->hsm_task_state
= HSM_ST_ERR
;
3864 /* transfer data if any */
3865 if (is_atapi_taskfile(&qc
->tf
)) {
3866 /* DRQ=0 means no more data to transfer */
3867 if ((status
& ATA_DRQ
) == 0) {
3868 ap
->hsm_task_state
= HSM_ST_LAST
;
3872 atapi_pio_bytes(qc
);
3874 /* handle BSY=0, DRQ=0 as error */
3875 if ((status
& ATA_DRQ
) == 0) {
3876 qc
->err_mask
|= AC_ERR_HSM
;
3877 ap
->hsm_task_state
= HSM_ST_ERR
;
3885 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3887 struct ata_port
*ap
= qc
->ap
;
3889 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3890 printk(KERN_WARNING
"ata%u: dev %u PIO error\n",
3891 ap
->id
, qc
->dev
->devno
);
3893 /* make sure qc->err_mask is available to
3894 * know what's wrong and recover
3896 WARN_ON(qc
->err_mask
== 0);
3898 ap
->hsm_task_state
= HSM_ST_IDLE
;
3900 ata_poll_qc_complete(qc
);
3903 static void ata_pio_task(void *_data
)
3905 struct ata_queued_cmd
*qc
= _data
;
3906 struct ata_port
*ap
= qc
->ap
;
3907 unsigned long timeout
;
3914 switch (ap
->hsm_task_state
) {
3923 qc_completed
= ata_pio_complete(qc
);
3927 case HSM_ST_LAST_POLL
:
3928 timeout
= ata_pio_poll(qc
);
3938 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3939 else if (!qc_completed
)
3944 * atapi_packet_task - Write CDB bytes to hardware
3945 * @_data: qc in progress
3947 * When device has indicated its readiness to accept
3948 * a CDB, this function is called. Send the CDB.
3949 * If DMA is to be performed, exit immediately.
3950 * Otherwise, we are in polling mode, so poll
3951 * status under operation succeeds or fails.
3954 * Kernel thread context (may sleep)
3956 static void atapi_packet_task(void *_data
)
3958 struct ata_queued_cmd
*qc
= _data
;
3959 struct ata_port
*ap
= qc
->ap
;
3962 /* sleep-wait for BSY to clear */
3963 DPRINTK("busy wait\n");
3964 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3965 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3969 /* make sure DRQ is set */
3970 status
= ata_chk_status(ap
);
3971 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3972 qc
->err_mask
|= AC_ERR_HSM
;
3977 DPRINTK("send cdb\n");
3978 WARN_ON(qc
->dev
->cdb_len
< 12);
3980 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3981 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3982 unsigned long flags
;
3984 /* Once we're done issuing command and kicking bmdma,
3985 * irq handler takes over. To not lose irq, we need
3986 * to clear NOINTR flag before sending cdb, but
3987 * interrupt handler shouldn't be invoked before we're
3988 * finished. Hence, the following locking.
3990 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3991 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3992 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3993 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3994 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3995 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3997 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3999 /* PIO commands are handled by polling */
4000 ap
->hsm_task_state
= HSM_ST
;
4001 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4007 ata_poll_qc_complete(qc
);
4011 * ata_qc_new - Request an available ATA command, for queueing
4012 * @ap: Port associated with device @dev
4013 * @dev: Device from whom we request an available command structure
4019 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4021 struct ata_queued_cmd
*qc
= NULL
;
4024 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4025 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4026 qc
= ata_qc_from_tag(ap
, i
);
4037 * ata_qc_new_init - Request an available ATA command, and initialize it
4038 * @dev: Device from whom we request an available command structure
4044 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4046 struct ata_port
*ap
= dev
->ap
;
4047 struct ata_queued_cmd
*qc
;
4049 qc
= ata_qc_new(ap
);
4062 * ata_qc_free - free unused ata_queued_cmd
4063 * @qc: Command to complete
4065 * Designed to free unused ata_queued_cmd object
4066 * in case something prevents using it.
4069 * spin_lock_irqsave(host_set lock)
4071 void ata_qc_free(struct ata_queued_cmd
*qc
)
4073 struct ata_port
*ap
= qc
->ap
;
4076 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4080 if (likely(ata_tag_valid(tag
))) {
4081 qc
->tag
= ATA_TAG_POISON
;
4082 clear_bit(tag
, &ap
->qactive
);
4086 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4088 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4089 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4091 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4094 /* command should be marked inactive atomically with qc completion */
4095 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4097 /* atapi: mark qc as inactive to prevent the interrupt handler
4098 * from completing the command twice later, before the error handler
4099 * is called. (when rc != 0 and atapi request sense is needed)
4101 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4103 /* call completion callback */
4104 qc
->complete_fn(qc
);
4107 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4109 struct ata_port
*ap
= qc
->ap
;
4111 switch (qc
->tf
.protocol
) {
4113 case ATA_PROT_ATAPI_DMA
:
4116 case ATA_PROT_ATAPI
:
4118 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4131 * ata_qc_issue - issue taskfile to device
4132 * @qc: command to issue to device
4134 * Prepare an ATA command to submission to device.
4135 * This includes mapping the data into a DMA-able
4136 * area, filling in the S/G table, and finally
4137 * writing the taskfile to hardware, starting the command.
4140 * spin_lock_irqsave(host_set lock)
4142 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4144 struct ata_port
*ap
= qc
->ap
;
4146 qc
->ap
->active_tag
= qc
->tag
;
4147 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4149 if (ata_should_dma_map(qc
)) {
4150 if (qc
->flags
& ATA_QCFLAG_SG
) {
4151 if (ata_sg_setup(qc
))
4153 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4154 if (ata_sg_setup_one(qc
))
4158 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4161 ap
->ops
->qc_prep(qc
);
4163 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4164 if (unlikely(qc
->err_mask
))
4169 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4170 qc
->err_mask
|= AC_ERR_SYSTEM
;
4172 ata_qc_complete(qc
);
4176 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4177 * @qc: command to issue to device
4179 * Using various libata functions and hooks, this function
4180 * starts an ATA command. ATA commands are grouped into
4181 * classes called "protocols", and issuing each type of protocol
4182 * is slightly different.
4184 * May be used as the qc_issue() entry in ata_port_operations.
4187 * spin_lock_irqsave(host_set lock)
4190 * Zero on success, AC_ERR_* mask on failure
4193 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4195 struct ata_port
*ap
= qc
->ap
;
4197 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4199 switch (qc
->tf
.protocol
) {
4200 case ATA_PROT_NODATA
:
4201 ata_tf_to_host(ap
, &qc
->tf
);
4205 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4206 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4207 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4210 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4211 ata_qc_set_polling(qc
);
4212 ata_tf_to_host(ap
, &qc
->tf
);
4213 ap
->hsm_task_state
= HSM_ST
;
4214 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4217 case ATA_PROT_ATAPI
:
4218 ata_qc_set_polling(qc
);
4219 ata_tf_to_host(ap
, &qc
->tf
);
4220 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4223 case ATA_PROT_ATAPI_NODATA
:
4224 ap
->flags
|= ATA_FLAG_NOINTR
;
4225 ata_tf_to_host(ap
, &qc
->tf
);
4226 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4229 case ATA_PROT_ATAPI_DMA
:
4230 ap
->flags
|= ATA_FLAG_NOINTR
;
4231 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4232 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4233 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4238 return AC_ERR_SYSTEM
;
4245 * ata_host_intr - Handle host interrupt for given (port, task)
4246 * @ap: Port on which interrupt arrived (possibly...)
4247 * @qc: Taskfile currently active in engine
4249 * Handle host interrupt for given queued command. Currently,
4250 * only DMA interrupts are handled. All other commands are
4251 * handled via polling with interrupts disabled (nIEN bit).
4254 * spin_lock_irqsave(host_set lock)
4257 * One if interrupt was handled, zero if not (shared irq).
4260 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4261 struct ata_queued_cmd
*qc
)
4263 u8 status
, host_stat
;
4265 switch (qc
->tf
.protocol
) {
4268 case ATA_PROT_ATAPI_DMA
:
4269 case ATA_PROT_ATAPI
:
4270 /* check status of DMA engine */
4271 host_stat
= ap
->ops
->bmdma_status(ap
);
4272 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4274 /* if it's not our irq... */
4275 if (!(host_stat
& ATA_DMA_INTR
))
4278 /* before we do anything else, clear DMA-Start bit */
4279 ap
->ops
->bmdma_stop(qc
);
4283 case ATA_PROT_ATAPI_NODATA
:
4284 case ATA_PROT_NODATA
:
4285 /* check altstatus */
4286 status
= ata_altstatus(ap
);
4287 if (status
& ATA_BUSY
)
4290 /* check main status, clearing INTRQ */
4291 status
= ata_chk_status(ap
);
4292 if (unlikely(status
& ATA_BUSY
))
4294 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4295 ap
->id
, qc
->tf
.protocol
, status
);
4297 /* ack bmdma irq events */
4298 ap
->ops
->irq_clear(ap
);
4300 /* complete taskfile transaction */
4301 qc
->err_mask
|= ac_err_mask(status
);
4302 ata_qc_complete(qc
);
4309 return 1; /* irq handled */
4312 ap
->stats
.idle_irq
++;
4315 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4316 ata_irq_ack(ap
, 0); /* debug trap */
4317 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4321 return 0; /* irq not handled */
4325 * ata_interrupt - Default ATA host interrupt handler
4326 * @irq: irq line (unused)
4327 * @dev_instance: pointer to our ata_host_set information structure
4330 * Default interrupt handler for PCI IDE devices. Calls
4331 * ata_host_intr() for each port that is not disabled.
4334 * Obtains host_set lock during operation.
4337 * IRQ_NONE or IRQ_HANDLED.
4340 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4342 struct ata_host_set
*host_set
= dev_instance
;
4344 unsigned int handled
= 0;
4345 unsigned long flags
;
4347 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4348 spin_lock_irqsave(&host_set
->lock
, flags
);
4350 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4351 struct ata_port
*ap
;
4353 ap
= host_set
->ports
[i
];
4355 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4356 struct ata_queued_cmd
*qc
;
4358 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4359 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4360 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4361 handled
|= ata_host_intr(ap
, qc
);
4365 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4367 return IRQ_RETVAL(handled
);
4371 * sata_scr_valid - test whether SCRs are accessible
4372 * @ap: ATA port to test SCR accessibility for
4374 * Test whether SCRs are accessible for @ap.
4380 * 1 if SCRs are accessible, 0 otherwise.
4382 int sata_scr_valid(struct ata_port
*ap
)
4384 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4388 * sata_scr_read - read SCR register of the specified port
4389 * @ap: ATA port to read SCR for
4391 * @val: Place to store read value
4393 * Read SCR register @reg of @ap into *@val. This function is
4394 * guaranteed to succeed if the cable type of the port is SATA
4395 * and the port implements ->scr_read.
4401 * 0 on success, negative errno on failure.
4403 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4405 if (sata_scr_valid(ap
)) {
4406 *val
= ap
->ops
->scr_read(ap
, reg
);
4413 * sata_scr_write - write SCR register of the specified port
4414 * @ap: ATA port to write SCR for
4415 * @reg: SCR to write
4416 * @val: value to write
4418 * Write @val to SCR register @reg of @ap. This function is
4419 * guaranteed to succeed if the cable type of the port is SATA
4420 * and the port implements ->scr_read.
4426 * 0 on success, negative errno on failure.
4428 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4430 if (sata_scr_valid(ap
)) {
4431 ap
->ops
->scr_write(ap
, reg
, val
);
4438 * sata_scr_write_flush - write SCR register of the specified port and flush
4439 * @ap: ATA port to write SCR for
4440 * @reg: SCR to write
4441 * @val: value to write
4443 * This function is identical to sata_scr_write() except that this
4444 * function performs flush after writing to the register.
4450 * 0 on success, negative errno on failure.
4452 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4454 if (sata_scr_valid(ap
)) {
4455 ap
->ops
->scr_write(ap
, reg
, val
);
4456 ap
->ops
->scr_read(ap
, reg
);
4463 * ata_port_online - test whether the given port is online
4464 * @ap: ATA port to test
4466 * Test whether @ap is online. Note that this function returns 0
4467 * if online status of @ap cannot be obtained, so
4468 * ata_port_online(ap) != !ata_port_offline(ap).
4474 * 1 if the port online status is available and online.
4476 int ata_port_online(struct ata_port
*ap
)
4480 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4486 * ata_port_offline - test whether the given port is offline
4487 * @ap: ATA port to test
4489 * Test whether @ap is offline. Note that this function returns
4490 * 0 if offline status of @ap cannot be obtained, so
4491 * ata_port_online(ap) != !ata_port_offline(ap).
4497 * 1 if the port offline status is available and offline.
4499 int ata_port_offline(struct ata_port
*ap
)
4503 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4509 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4510 * without filling any other registers
4512 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4514 struct ata_taskfile tf
;
4517 ata_tf_init(dev
, &tf
);
4520 tf
.flags
|= ATA_TFLAG_DEVICE
;
4521 tf
.protocol
= ATA_PROT_NODATA
;
4523 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4525 printk(KERN_ERR
"%s: ata command failed: %d\n",
4531 static int ata_flush_cache(struct ata_device
*dev
)
4535 if (!ata_try_flush_cache(dev
))
4538 if (ata_id_has_flush_ext(dev
->id
))
4539 cmd
= ATA_CMD_FLUSH_EXT
;
4541 cmd
= ATA_CMD_FLUSH
;
4543 return ata_do_simple_cmd(dev
, cmd
);
4546 static int ata_standby_drive(struct ata_device
*dev
)
4548 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4551 static int ata_start_drive(struct ata_device
*dev
)
4553 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4557 * ata_device_resume - wakeup a previously suspended devices
4558 * @dev: the device to resume
4560 * Kick the drive back into action, by sending it an idle immediate
4561 * command and making sure its transfer mode matches between drive
4565 int ata_device_resume(struct ata_device
*dev
)
4567 struct ata_port
*ap
= dev
->ap
;
4569 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4570 struct ata_device
*failed_dev
;
4571 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4572 while (ata_set_mode(ap
, &failed_dev
))
4573 ata_dev_disable(failed_dev
);
4575 if (!ata_dev_enabled(dev
))
4577 if (dev
->class == ATA_DEV_ATA
)
4578 ata_start_drive(dev
);
4584 * ata_device_suspend - prepare a device for suspend
4585 * @dev: the device to suspend
4587 * Flush the cache on the drive, if appropriate, then issue a
4588 * standbynow command.
4590 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
4592 struct ata_port
*ap
= dev
->ap
;
4594 if (!ata_dev_enabled(dev
))
4596 if (dev
->class == ATA_DEV_ATA
)
4597 ata_flush_cache(dev
);
4599 if (state
.event
!= PM_EVENT_FREEZE
)
4600 ata_standby_drive(dev
);
4601 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4606 * ata_port_start - Set port up for dma.
4607 * @ap: Port to initialize
4609 * Called just after data structures for each port are
4610 * initialized. Allocates space for PRD table.
4612 * May be used as the port_start() entry in ata_port_operations.
4615 * Inherited from caller.
4618 int ata_port_start (struct ata_port
*ap
)
4620 struct device
*dev
= ap
->dev
;
4623 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4627 rc
= ata_pad_alloc(ap
, dev
);
4629 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4633 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4640 * ata_port_stop - Undo ata_port_start()
4641 * @ap: Port to shut down
4643 * Frees the PRD table.
4645 * May be used as the port_stop() entry in ata_port_operations.
4648 * Inherited from caller.
4651 void ata_port_stop (struct ata_port
*ap
)
4653 struct device
*dev
= ap
->dev
;
4655 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4656 ata_pad_free(ap
, dev
);
4659 void ata_host_stop (struct ata_host_set
*host_set
)
4661 if (host_set
->mmio_base
)
4662 iounmap(host_set
->mmio_base
);
4667 * ata_host_remove - Unregister SCSI host structure with upper layers
4668 * @ap: Port to unregister
4669 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4672 * Inherited from caller.
4675 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4677 struct Scsi_Host
*sh
= ap
->host
;
4682 scsi_remove_host(sh
);
4684 ap
->ops
->port_stop(ap
);
4688 * ata_host_init - Initialize an ata_port structure
4689 * @ap: Structure to initialize
4690 * @host: associated SCSI mid-layer structure
4691 * @host_set: Collection of hosts to which @ap belongs
4692 * @ent: Probe information provided by low-level driver
4693 * @port_no: Port number associated with this ata_port
4695 * Initialize a new ata_port structure, and its associated
4699 * Inherited from caller.
4702 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4703 struct ata_host_set
*host_set
,
4704 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4710 host
->max_channel
= 1;
4711 host
->unique_id
= ata_unique_id
++;
4712 host
->max_cmd_len
= 12;
4714 ap
->flags
= ATA_FLAG_DISABLED
;
4715 ap
->id
= host
->unique_id
;
4717 ap
->ctl
= ATA_DEVCTL_OBS
;
4718 ap
->host_set
= host_set
;
4720 ap
->port_no
= port_no
;
4722 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4723 ap
->pio_mask
= ent
->pio_mask
;
4724 ap
->mwdma_mask
= ent
->mwdma_mask
;
4725 ap
->udma_mask
= ent
->udma_mask
;
4726 ap
->flags
|= ent
->host_flags
;
4727 ap
->ops
= ent
->port_ops
;
4728 ap
->sata_spd_limit
= UINT_MAX
;
4729 ap
->active_tag
= ATA_TAG_POISON
;
4730 ap
->last_ctl
= 0xFF;
4732 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4733 INIT_LIST_HEAD(&ap
->eh_done_q
);
4735 /* set cable type */
4736 ap
->cbl
= ATA_CBL_NONE
;
4737 if (ap
->flags
& ATA_FLAG_SATA
)
4738 ap
->cbl
= ATA_CBL_SATA
;
4740 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4741 struct ata_device
*dev
= &ap
->device
[i
];
4744 dev
->pio_mask
= UINT_MAX
;
4745 dev
->mwdma_mask
= UINT_MAX
;
4746 dev
->udma_mask
= UINT_MAX
;
4750 ap
->stats
.unhandled_irq
= 1;
4751 ap
->stats
.idle_irq
= 1;
4754 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4758 * ata_host_add - Attach low-level ATA driver to system
4759 * @ent: Information provided by low-level driver
4760 * @host_set: Collections of ports to which we add
4761 * @port_no: Port number associated with this host
4763 * Attach low-level ATA driver to system.
4766 * PCI/etc. bus probe sem.
4769 * New ata_port on success, for NULL on error.
4772 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4773 struct ata_host_set
*host_set
,
4774 unsigned int port_no
)
4776 struct Scsi_Host
*host
;
4777 struct ata_port
*ap
;
4782 if (!ent
->port_ops
->probe_reset
&&
4783 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4784 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4789 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4793 host
->transportt
= &ata_scsi_transport_template
;
4795 ap
= ata_shost_to_port(host
);
4797 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4799 rc
= ap
->ops
->port_start(ap
);
4806 scsi_host_put(host
);
4811 * ata_device_add - Register hardware device with ATA and SCSI layers
4812 * @ent: Probe information describing hardware device to be registered
4814 * This function processes the information provided in the probe
4815 * information struct @ent, allocates the necessary ATA and SCSI
4816 * host information structures, initializes them, and registers
4817 * everything with requisite kernel subsystems.
4819 * This function requests irqs, probes the ATA bus, and probes
4823 * PCI/etc. bus probe sem.
4826 * Number of ports registered. Zero on error (no ports registered).
4829 int ata_device_add(const struct ata_probe_ent
*ent
)
4831 unsigned int count
= 0, i
;
4832 struct device
*dev
= ent
->dev
;
4833 struct ata_host_set
*host_set
;
4836 /* alloc a container for our list of ATA ports (buses) */
4837 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4838 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4841 spin_lock_init(&host_set
->lock
);
4843 host_set
->dev
= dev
;
4844 host_set
->n_ports
= ent
->n_ports
;
4845 host_set
->irq
= ent
->irq
;
4846 host_set
->mmio_base
= ent
->mmio_base
;
4847 host_set
->private_data
= ent
->private_data
;
4848 host_set
->ops
= ent
->port_ops
;
4849 host_set
->flags
= ent
->host_set_flags
;
4851 /* register each port bound to this device */
4852 for (i
= 0; i
< ent
->n_ports
; i
++) {
4853 struct ata_port
*ap
;
4854 unsigned long xfer_mode_mask
;
4856 ap
= ata_host_add(ent
, host_set
, i
);
4860 host_set
->ports
[i
] = ap
;
4861 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4862 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4863 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4865 /* print per-port info to dmesg */
4866 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4867 "bmdma 0x%lX irq %lu\n",
4869 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4870 ata_mode_string(xfer_mode_mask
),
4871 ap
->ioaddr
.cmd_addr
,
4872 ap
->ioaddr
.ctl_addr
,
4873 ap
->ioaddr
.bmdma_addr
,
4877 host_set
->ops
->irq_clear(ap
);
4884 /* obtain irq, that is shared between channels */
4885 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4886 DRV_NAME
, host_set
))
4889 /* perform each probe synchronously */
4890 DPRINTK("probe begin\n");
4891 for (i
= 0; i
< count
; i
++) {
4892 struct ata_port
*ap
;
4895 ap
= host_set
->ports
[i
];
4897 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4898 rc
= ata_bus_probe(ap
);
4899 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4902 /* FIXME: do something useful here?
4903 * Current libata behavior will
4904 * tear down everything when
4905 * the module is removed
4906 * or the h/w is unplugged.
4910 rc
= scsi_add_host(ap
->host
, dev
);
4912 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4914 /* FIXME: do something useful here */
4915 /* FIXME: handle unconditional calls to
4916 * scsi_scan_host and ata_host_remove, below,
4922 /* probes are done, now scan each port's disk(s) */
4923 DPRINTK("host probe begin\n");
4924 for (i
= 0; i
< count
; i
++) {
4925 struct ata_port
*ap
= host_set
->ports
[i
];
4927 ata_scsi_scan_host(ap
);
4930 dev_set_drvdata(dev
, host_set
);
4932 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4933 return ent
->n_ports
; /* success */
4936 for (i
= 0; i
< count
; i
++) {
4937 ata_host_remove(host_set
->ports
[i
], 1);
4938 scsi_host_put(host_set
->ports
[i
]->host
);
4942 VPRINTK("EXIT, returning 0\n");
4947 * ata_host_set_remove - PCI layer callback for device removal
4948 * @host_set: ATA host set that was removed
4950 * Unregister all objects associated with this host set. Free those
4954 * Inherited from calling layer (may sleep).
4957 void ata_host_set_remove(struct ata_host_set
*host_set
)
4959 struct ata_port
*ap
;
4962 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4963 ap
= host_set
->ports
[i
];
4964 scsi_remove_host(ap
->host
);
4967 free_irq(host_set
->irq
, host_set
);
4969 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4970 ap
= host_set
->ports
[i
];
4972 ata_scsi_release(ap
->host
);
4974 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4975 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4977 if (ioaddr
->cmd_addr
== 0x1f0)
4978 release_region(0x1f0, 8);
4979 else if (ioaddr
->cmd_addr
== 0x170)
4980 release_region(0x170, 8);
4983 scsi_host_put(ap
->host
);
4986 if (host_set
->ops
->host_stop
)
4987 host_set
->ops
->host_stop(host_set
);
4993 * ata_scsi_release - SCSI layer callback hook for host unload
4994 * @host: libata host to be unloaded
4996 * Performs all duties necessary to shut down a libata port...
4997 * Kill port kthread, disable port, and release resources.
5000 * Inherited from SCSI layer.
5006 int ata_scsi_release(struct Scsi_Host
*host
)
5008 struct ata_port
*ap
= ata_shost_to_port(host
);
5012 ap
->ops
->port_disable(ap
);
5013 ata_host_remove(ap
, 0);
5020 * ata_std_ports - initialize ioaddr with standard port offsets.
5021 * @ioaddr: IO address structure to be initialized
5023 * Utility function which initializes data_addr, error_addr,
5024 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5025 * device_addr, status_addr, and command_addr to standard offsets
5026 * relative to cmd_addr.
5028 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5031 void ata_std_ports(struct ata_ioports
*ioaddr
)
5033 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5034 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5035 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5036 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5037 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5038 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5039 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5040 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5041 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5042 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5048 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5050 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5052 pci_iounmap(pdev
, host_set
->mmio_base
);
5056 * ata_pci_remove_one - PCI layer callback for device removal
5057 * @pdev: PCI device that was removed
5059 * PCI layer indicates to libata via this hook that
5060 * hot-unplug or module unload event has occurred.
5061 * Handle this by unregistering all objects associated
5062 * with this PCI device. Free those objects. Then finally
5063 * release PCI resources and disable device.
5066 * Inherited from PCI layer (may sleep).
5069 void ata_pci_remove_one (struct pci_dev
*pdev
)
5071 struct device
*dev
= pci_dev_to_dev(pdev
);
5072 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5074 ata_host_set_remove(host_set
);
5075 pci_release_regions(pdev
);
5076 pci_disable_device(pdev
);
5077 dev_set_drvdata(dev
, NULL
);
5080 /* move to PCI subsystem */
5081 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5083 unsigned long tmp
= 0;
5085 switch (bits
->width
) {
5088 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5094 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5100 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5111 return (tmp
== bits
->val
) ? 1 : 0;
5114 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5116 pci_save_state(pdev
);
5117 pci_disable_device(pdev
);
5118 pci_set_power_state(pdev
, PCI_D3hot
);
5122 int ata_pci_device_resume(struct pci_dev
*pdev
)
5124 pci_set_power_state(pdev
, PCI_D0
);
5125 pci_restore_state(pdev
);
5126 pci_enable_device(pdev
);
5127 pci_set_master(pdev
);
5130 #endif /* CONFIG_PCI */
5133 static int __init
ata_init(void)
5135 ata_wq
= create_workqueue("ata");
5139 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5143 static void __exit
ata_exit(void)
5145 destroy_workqueue(ata_wq
);
5148 module_init(ata_init
);
5149 module_exit(ata_exit
);
5151 static unsigned long ratelimit_time
;
5152 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5154 int ata_ratelimit(void)
5157 unsigned long flags
;
5159 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5161 if (time_after(jiffies
, ratelimit_time
)) {
5163 ratelimit_time
= jiffies
+ (HZ
/5);
5167 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5173 * ata_wait_register - wait until register value changes
5174 * @reg: IO-mapped register
5175 * @mask: Mask to apply to read register value
5176 * @val: Wait condition
5177 * @interval_msec: polling interval in milliseconds
5178 * @timeout_msec: timeout in milliseconds
5180 * Waiting for some bits of register to change is a common
5181 * operation for ATA controllers. This function reads 32bit LE
5182 * IO-mapped register @reg and tests for the following condition.
5184 * (*@reg & mask) != val
5186 * If the condition is met, it returns; otherwise, the process is
5187 * repeated after @interval_msec until timeout.
5190 * Kernel thread context (may sleep)
5193 * The final register value.
5195 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5196 unsigned long interval_msec
,
5197 unsigned long timeout_msec
)
5199 unsigned long timeout
;
5202 tmp
= ioread32(reg
);
5204 /* Calculate timeout _after_ the first read to make sure
5205 * preceding writes reach the controller before starting to
5206 * eat away the timeout.
5208 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5210 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5211 msleep(interval_msec
);
5212 tmp
= ioread32(reg
);
5219 * libata is essentially a library of internal helper functions for
5220 * low-level ATA host controller drivers. As such, the API/ABI is
5221 * likely to change as new drivers are added and updated.
5222 * Do not depend on ABI/API stability.
5225 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5226 EXPORT_SYMBOL_GPL(ata_std_ports
);
5227 EXPORT_SYMBOL_GPL(ata_device_add
);
5228 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5229 EXPORT_SYMBOL_GPL(ata_sg_init
);
5230 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5231 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5232 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5233 EXPORT_SYMBOL_GPL(ata_tf_load
);
5234 EXPORT_SYMBOL_GPL(ata_tf_read
);
5235 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5236 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5237 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5238 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5239 EXPORT_SYMBOL_GPL(ata_check_status
);
5240 EXPORT_SYMBOL_GPL(ata_altstatus
);
5241 EXPORT_SYMBOL_GPL(ata_exec_command
);
5242 EXPORT_SYMBOL_GPL(ata_port_start
);
5243 EXPORT_SYMBOL_GPL(ata_port_stop
);
5244 EXPORT_SYMBOL_GPL(ata_host_stop
);
5245 EXPORT_SYMBOL_GPL(ata_interrupt
);
5246 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5247 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5248 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5249 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5250 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5251 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5252 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5253 EXPORT_SYMBOL_GPL(ata_port_probe
);
5254 EXPORT_SYMBOL_GPL(sata_set_spd
);
5255 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5256 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5257 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5258 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5259 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5260 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5261 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5262 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5263 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5264 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5265 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5266 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5267 EXPORT_SYMBOL_GPL(ata_port_disable
);
5268 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5269 EXPORT_SYMBOL_GPL(ata_wait_register
);
5270 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5271 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5272 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5273 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5274 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5275 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5276 EXPORT_SYMBOL_GPL(ata_host_intr
);
5277 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5278 EXPORT_SYMBOL_GPL(sata_scr_read
);
5279 EXPORT_SYMBOL_GPL(sata_scr_write
);
5280 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5281 EXPORT_SYMBOL_GPL(ata_port_online
);
5282 EXPORT_SYMBOL_GPL(ata_port_offline
);
5283 EXPORT_SYMBOL_GPL(ata_id_string
);
5284 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5285 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5287 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5288 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5289 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5292 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5293 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5294 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5295 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5296 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5297 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5298 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5299 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5300 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5301 #endif /* CONFIG_PCI */
5303 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5304 EXPORT_SYMBOL_GPL(ata_device_resume
);
5305 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5306 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5308 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5309 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5310 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);