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/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/list.h>
41 #include <linux/highmem.h>
42 #include <linux/spinlock.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/interrupt.h>
47 #include <linux/completion.h>
48 #include <linux/suspend.h>
49 #include <linux/workqueue.h>
50 #include <linux/jiffies.h>
51 #include <linux/scatterlist.h>
52 #include <scsi/scsi.h>
53 #include "scsi_priv.h"
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_host.h>
56 #include <linux/libata.h>
58 #include <asm/semaphore.h>
59 #include <asm/byteorder.h>
63 /* debounce timing parameters in msecs { interval, duration, timeout } */
64 const unsigned long sata_deb_timing_boot
[] = { 5, 100, 2000 };
65 const unsigned long sata_deb_timing_eh
[] = { 25, 500, 2000 };
66 const unsigned long sata_deb_timing_before_fsrst
[] = { 100, 2000, 5000 };
68 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
69 u16 heads
, u16 sectors
);
70 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
71 static void ata_dev_xfermask(struct ata_device
*dev
);
73 static unsigned int ata_unique_id
= 1;
74 static struct workqueue_struct
*ata_wq
;
76 struct workqueue_struct
*ata_aux_wq
;
78 int atapi_enabled
= 1;
79 module_param(atapi_enabled
, int, 0444);
80 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
83 module_param(atapi_dmadir
, int, 0444);
84 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
87 module_param_named(fua
, libata_fua
, int, 0444);
88 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
90 static int ata_probe_timeout
= ATA_TMOUT_INTERNAL
/ HZ
;
91 module_param(ata_probe_timeout
, int, 0444);
92 MODULE_PARM_DESC(ata_probe_timeout
, "Set ATA probing timeout (seconds)");
94 MODULE_AUTHOR("Jeff Garzik");
95 MODULE_DESCRIPTION("Library module for ATA devices");
96 MODULE_LICENSE("GPL");
97 MODULE_VERSION(DRV_VERSION
);
101 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
102 * @tf: Taskfile to convert
103 * @fis: Buffer into which data will output
104 * @pmp: Port multiplier port
106 * Converts a standard ATA taskfile to a Serial ATA
107 * FIS structure (Register - Host to Device).
110 * Inherited from caller.
113 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
115 fis
[0] = 0x27; /* Register - Host to Device FIS */
116 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
117 bit 7 indicates Command FIS */
118 fis
[2] = tf
->command
;
119 fis
[3] = tf
->feature
;
126 fis
[8] = tf
->hob_lbal
;
127 fis
[9] = tf
->hob_lbam
;
128 fis
[10] = tf
->hob_lbah
;
129 fis
[11] = tf
->hob_feature
;
132 fis
[13] = tf
->hob_nsect
;
143 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
144 * @fis: Buffer from which data will be input
145 * @tf: Taskfile to output
147 * Converts a serial ATA FIS structure to a standard ATA taskfile.
150 * Inherited from caller.
153 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
155 tf
->command
= fis
[2]; /* status */
156 tf
->feature
= fis
[3]; /* error */
163 tf
->hob_lbal
= fis
[8];
164 tf
->hob_lbam
= fis
[9];
165 tf
->hob_lbah
= fis
[10];
168 tf
->hob_nsect
= fis
[13];
171 static const u8 ata_rw_cmds
[] = {
175 ATA_CMD_READ_MULTI_EXT
,
176 ATA_CMD_WRITE_MULTI_EXT
,
180 ATA_CMD_WRITE_MULTI_FUA_EXT
,
184 ATA_CMD_PIO_READ_EXT
,
185 ATA_CMD_PIO_WRITE_EXT
,
198 ATA_CMD_WRITE_FUA_EXT
202 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
203 * @qc: command to examine and configure
205 * Examine the device configuration and tf->flags to calculate
206 * the proper read/write commands and protocol to use.
211 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
213 struct ata_taskfile
*tf
= &qc
->tf
;
214 struct ata_device
*dev
= qc
->dev
;
217 int index
, fua
, lba48
, write
;
219 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
220 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
221 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
223 if (dev
->flags
& ATA_DFLAG_PIO
) {
224 tf
->protocol
= ATA_PROT_PIO
;
225 index
= dev
->multi_count
? 0 : 8;
226 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
227 /* Unable to use DMA due to host limitation */
228 tf
->protocol
= ATA_PROT_PIO
;
229 index
= dev
->multi_count
? 0 : 8;
231 tf
->protocol
= ATA_PROT_DMA
;
235 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
244 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
245 * @pio_mask: pio_mask
246 * @mwdma_mask: mwdma_mask
247 * @udma_mask: udma_mask
249 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
250 * unsigned int xfer_mask.
258 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
259 unsigned int mwdma_mask
,
260 unsigned int udma_mask
)
262 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
263 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
264 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
268 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
269 * @xfer_mask: xfer_mask to unpack
270 * @pio_mask: resulting pio_mask
271 * @mwdma_mask: resulting mwdma_mask
272 * @udma_mask: resulting udma_mask
274 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
275 * Any NULL distination masks will be ignored.
277 static void ata_unpack_xfermask(unsigned int xfer_mask
,
278 unsigned int *pio_mask
,
279 unsigned int *mwdma_mask
,
280 unsigned int *udma_mask
)
283 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
285 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
287 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
290 static const struct ata_xfer_ent
{
294 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
295 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
296 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
301 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
302 * @xfer_mask: xfer_mask of interest
304 * Return matching XFER_* value for @xfer_mask. Only the highest
305 * bit of @xfer_mask is considered.
311 * Matching XFER_* value, 0 if no match found.
313 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
315 int highbit
= fls(xfer_mask
) - 1;
316 const struct ata_xfer_ent
*ent
;
318 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
319 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
320 return ent
->base
+ highbit
- ent
->shift
;
325 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
326 * @xfer_mode: XFER_* of interest
328 * Return matching xfer_mask for @xfer_mode.
334 * Matching xfer_mask, 0 if no match found.
336 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
338 const struct ata_xfer_ent
*ent
;
340 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
341 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
342 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
347 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
348 * @xfer_mode: XFER_* of interest
350 * Return matching xfer_shift for @xfer_mode.
356 * Matching xfer_shift, -1 if no match found.
358 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
360 const struct ata_xfer_ent
*ent
;
362 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
363 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
369 * ata_mode_string - convert xfer_mask to string
370 * @xfer_mask: mask of bits supported; only highest bit counts.
372 * Determine string which represents the highest speed
373 * (highest bit in @modemask).
379 * Constant C string representing highest speed listed in
380 * @mode_mask, or the constant C string "<n/a>".
382 static const char *ata_mode_string(unsigned int xfer_mask
)
384 static const char * const xfer_mode_str
[] = {
404 highbit
= fls(xfer_mask
) - 1;
405 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
406 return xfer_mode_str
[highbit
];
410 static const char *sata_spd_string(unsigned int spd
)
412 static const char * const spd_str
[] = {
417 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
419 return spd_str
[spd
- 1];
422 void ata_dev_disable(struct ata_device
*dev
)
424 if (ata_dev_enabled(dev
) && ata_msg_drv(dev
->ap
)) {
425 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
431 * ata_pio_devchk - PATA device presence detection
432 * @ap: ATA channel to examine
433 * @device: Device to examine (starting at zero)
435 * This technique was originally described in
436 * Hale Landis's ATADRVR (www.ata-atapi.com), and
437 * later found its way into the ATA/ATAPI spec.
439 * Write a pattern to the ATA shadow registers,
440 * and if a device is present, it will respond by
441 * correctly storing and echoing back the
442 * ATA shadow register contents.
448 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
451 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
454 ap
->ops
->dev_select(ap
, device
);
456 outb(0x55, ioaddr
->nsect_addr
);
457 outb(0xaa, ioaddr
->lbal_addr
);
459 outb(0xaa, ioaddr
->nsect_addr
);
460 outb(0x55, ioaddr
->lbal_addr
);
462 outb(0x55, ioaddr
->nsect_addr
);
463 outb(0xaa, ioaddr
->lbal_addr
);
465 nsect
= inb(ioaddr
->nsect_addr
);
466 lbal
= inb(ioaddr
->lbal_addr
);
468 if ((nsect
== 0x55) && (lbal
== 0xaa))
469 return 1; /* we found a device */
471 return 0; /* nothing found */
475 * ata_mmio_devchk - PATA device presence detection
476 * @ap: ATA channel to examine
477 * @device: Device to examine (starting at zero)
479 * This technique was originally described in
480 * Hale Landis's ATADRVR (www.ata-atapi.com), and
481 * later found its way into the ATA/ATAPI spec.
483 * Write a pattern to the ATA shadow registers,
484 * and if a device is present, it will respond by
485 * correctly storing and echoing back the
486 * ATA shadow register contents.
492 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
495 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
498 ap
->ops
->dev_select(ap
, device
);
500 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
503 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
506 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
507 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
509 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
510 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
512 if ((nsect
== 0x55) && (lbal
== 0xaa))
513 return 1; /* we found a device */
515 return 0; /* nothing found */
519 * ata_devchk - PATA device presence detection
520 * @ap: ATA channel to examine
521 * @device: Device to examine (starting at zero)
523 * Dispatch ATA device presence detection, depending
524 * on whether we are using PIO or MMIO to talk to the
525 * ATA shadow registers.
531 static unsigned int ata_devchk(struct ata_port
*ap
,
534 if (ap
->flags
& ATA_FLAG_MMIO
)
535 return ata_mmio_devchk(ap
, device
);
536 return ata_pio_devchk(ap
, device
);
540 * ata_dev_classify - determine device type based on ATA-spec signature
541 * @tf: ATA taskfile register set for device to be identified
543 * Determine from taskfile register contents whether a device is
544 * ATA or ATAPI, as per "Signature and persistence" section
545 * of ATA/PI spec (volume 1, sect 5.14).
551 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
552 * the event of failure.
555 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
557 /* Apple's open source Darwin code hints that some devices only
558 * put a proper signature into the LBA mid/high registers,
559 * So, we only check those. It's sufficient for uniqueness.
562 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
563 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
564 DPRINTK("found ATA device by sig\n");
568 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
569 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
570 DPRINTK("found ATAPI device by sig\n");
571 return ATA_DEV_ATAPI
;
574 DPRINTK("unknown device\n");
575 return ATA_DEV_UNKNOWN
;
579 * ata_dev_try_classify - Parse returned ATA device signature
580 * @ap: ATA channel to examine
581 * @device: Device to examine (starting at zero)
582 * @r_err: Value of error register on completion
584 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
585 * an ATA/ATAPI-defined set of values is placed in the ATA
586 * shadow registers, indicating the results of device detection
589 * Select the ATA device, and read the values from the ATA shadow
590 * registers. Then parse according to the Error register value,
591 * and the spec-defined values examined by ata_dev_classify().
597 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
601 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
603 struct ata_taskfile tf
;
607 ap
->ops
->dev_select(ap
, device
);
609 memset(&tf
, 0, sizeof(tf
));
611 ap
->ops
->tf_read(ap
, &tf
);
616 /* see if device passed diags */
619 else if ((device
== 0) && (err
== 0x81))
624 /* determine if device is ATA or ATAPI */
625 class = ata_dev_classify(&tf
);
627 if (class == ATA_DEV_UNKNOWN
)
629 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
635 * ata_id_string - Convert IDENTIFY DEVICE page into string
636 * @id: IDENTIFY DEVICE results we will examine
637 * @s: string into which data is output
638 * @ofs: offset into identify device page
639 * @len: length of string to return. must be an even number.
641 * The strings in the IDENTIFY DEVICE page are broken up into
642 * 16-bit chunks. Run through the string, and output each
643 * 8-bit chunk linearly, regardless of platform.
649 void ata_id_string(const u16
*id
, unsigned char *s
,
650 unsigned int ofs
, unsigned int len
)
669 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
670 * @id: IDENTIFY DEVICE results we will examine
671 * @s: string into which data is output
672 * @ofs: offset into identify device page
673 * @len: length of string to return. must be an odd number.
675 * This function is identical to ata_id_string except that it
676 * trims trailing spaces and terminates the resulting string with
677 * null. @len must be actual maximum length (even number) + 1.
682 void ata_id_c_string(const u16
*id
, unsigned char *s
,
683 unsigned int ofs
, unsigned int len
)
689 ata_id_string(id
, s
, ofs
, len
- 1);
691 p
= s
+ strnlen(s
, len
- 1);
692 while (p
> s
&& p
[-1] == ' ')
697 static u64
ata_id_n_sectors(const u16
*id
)
699 if (ata_id_has_lba(id
)) {
700 if (ata_id_has_lba48(id
))
701 return ata_id_u64(id
, 100);
703 return ata_id_u32(id
, 60);
705 if (ata_id_current_chs_valid(id
))
706 return ata_id_u32(id
, 57);
708 return id
[1] * id
[3] * id
[6];
713 * ata_noop_dev_select - Select device 0/1 on ATA bus
714 * @ap: ATA channel to manipulate
715 * @device: ATA device (numbered from zero) to select
717 * This function performs no actual function.
719 * May be used as the dev_select() entry in ata_port_operations.
724 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
730 * ata_std_dev_select - Select device 0/1 on ATA bus
731 * @ap: ATA channel to manipulate
732 * @device: ATA device (numbered from zero) to select
734 * Use the method defined in the ATA specification to
735 * make either device 0, or device 1, active on the
736 * ATA channel. Works with both PIO and MMIO.
738 * May be used as the dev_select() entry in ata_port_operations.
744 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
749 tmp
= ATA_DEVICE_OBS
;
751 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
753 if (ap
->flags
& ATA_FLAG_MMIO
) {
754 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
756 outb(tmp
, ap
->ioaddr
.device_addr
);
758 ata_pause(ap
); /* needed; also flushes, for mmio */
762 * ata_dev_select - Select device 0/1 on ATA bus
763 * @ap: ATA channel to manipulate
764 * @device: ATA device (numbered from zero) to select
765 * @wait: non-zero to wait for Status register BSY bit to clear
766 * @can_sleep: non-zero if context allows sleeping
768 * Use the method defined in the ATA specification to
769 * make either device 0, or device 1, active on the
772 * This is a high-level version of ata_std_dev_select(),
773 * which additionally provides the services of inserting
774 * the proper pauses and status polling, where needed.
780 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
781 unsigned int wait
, unsigned int can_sleep
)
783 if (ata_msg_probe(ap
))
784 ata_port_printk(ap
, KERN_INFO
, "ata_dev_select: ENTER, ata%u: "
785 "device %u, wait %u\n", ap
->id
, device
, wait
);
790 ap
->ops
->dev_select(ap
, device
);
793 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
800 * ata_dump_id - IDENTIFY DEVICE info debugging output
801 * @id: IDENTIFY DEVICE page to dump
803 * Dump selected 16-bit words from the given IDENTIFY DEVICE
810 static inline void ata_dump_id(const u16
*id
)
812 DPRINTK("49==0x%04x "
822 DPRINTK("80==0x%04x "
832 DPRINTK("88==0x%04x "
839 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
840 * @id: IDENTIFY data to compute xfer mask from
842 * Compute the xfermask for this device. This is not as trivial
843 * as it seems if we must consider early devices correctly.
845 * FIXME: pre IDE drive timing (do we care ?).
853 static unsigned int ata_id_xfermask(const u16
*id
)
855 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
857 /* Usual case. Word 53 indicates word 64 is valid */
858 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
859 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
863 /* If word 64 isn't valid then Word 51 high byte holds
864 * the PIO timing number for the maximum. Turn it into
867 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
869 /* But wait.. there's more. Design your standards by
870 * committee and you too can get a free iordy field to
871 * process. However its the speeds not the modes that
872 * are supported... Note drivers using the timing API
873 * will get this right anyway
877 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
880 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
881 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
883 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
887 * ata_port_queue_task - Queue port_task
888 * @ap: The ata_port to queue port_task for
889 * @fn: workqueue function to be scheduled
890 * @data: data value to pass to workqueue function
891 * @delay: delay time for workqueue function
893 * Schedule @fn(@data) for execution after @delay jiffies using
894 * port_task. There is one port_task per port and it's the
895 * user(low level driver)'s responsibility to make sure that only
896 * one task is active at any given time.
898 * libata core layer takes care of synchronization between
899 * port_task and EH. ata_port_queue_task() may be ignored for EH
903 * Inherited from caller.
905 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
910 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
913 PREPARE_WORK(&ap
->port_task
, fn
, data
);
916 rc
= queue_work(ata_wq
, &ap
->port_task
);
918 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
920 /* rc == 0 means that another user is using port task */
925 * ata_port_flush_task - Flush port_task
926 * @ap: The ata_port to flush port_task for
928 * After this function completes, port_task is guranteed not to
929 * be running or scheduled.
932 * Kernel thread context (may sleep)
934 void ata_port_flush_task(struct ata_port
*ap
)
940 spin_lock_irqsave(ap
->lock
, flags
);
941 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
942 spin_unlock_irqrestore(ap
->lock
, flags
);
944 DPRINTK("flush #1\n");
945 flush_workqueue(ata_wq
);
948 * At this point, if a task is running, it's guaranteed to see
949 * the FLUSH flag; thus, it will never queue pio tasks again.
952 if (!cancel_delayed_work(&ap
->port_task
)) {
954 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n",
956 flush_workqueue(ata_wq
);
959 spin_lock_irqsave(ap
->lock
, flags
);
960 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
961 spin_unlock_irqrestore(ap
->lock
, flags
);
964 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
967 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
969 struct completion
*waiting
= qc
->private_data
;
975 * ata_exec_internal - execute libata internal command
976 * @dev: Device to which the command is sent
977 * @tf: Taskfile registers for the command and the result
978 * @cdb: CDB for packet command
979 * @dma_dir: Data tranfer direction of the command
980 * @buf: Data buffer of the command
981 * @buflen: Length of data buffer
983 * Executes libata internal command with timeout. @tf contains
984 * command on entry and result on return. Timeout and error
985 * conditions are reported via return value. No recovery action
986 * is taken after a command times out. It's caller's duty to
987 * clean up after timeout.
990 * None. Should be called with kernel context, might sleep.
993 * Zero on success, AC_ERR_* mask on failure
995 unsigned ata_exec_internal(struct ata_device
*dev
,
996 struct ata_taskfile
*tf
, const u8
*cdb
,
997 int dma_dir
, void *buf
, unsigned int buflen
)
999 struct ata_port
*ap
= dev
->ap
;
1000 u8 command
= tf
->command
;
1001 struct ata_queued_cmd
*qc
;
1002 unsigned int tag
, preempted_tag
;
1003 u32 preempted_sactive
, preempted_qc_active
;
1004 DECLARE_COMPLETION_ONSTACK(wait
);
1005 unsigned long flags
;
1006 unsigned int err_mask
;
1009 spin_lock_irqsave(ap
->lock
, flags
);
1011 /* no internal command while frozen */
1012 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1013 spin_unlock_irqrestore(ap
->lock
, flags
);
1014 return AC_ERR_SYSTEM
;
1017 /* initialize internal qc */
1019 /* XXX: Tag 0 is used for drivers with legacy EH as some
1020 * drivers choke if any other tag is given. This breaks
1021 * ata_tag_internal() test for those drivers. Don't use new
1022 * EH stuff without converting to it.
1024 if (ap
->ops
->error_handler
)
1025 tag
= ATA_TAG_INTERNAL
;
1029 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1031 qc
= __ata_qc_from_tag(ap
, tag
);
1039 preempted_tag
= ap
->active_tag
;
1040 preempted_sactive
= ap
->sactive
;
1041 preempted_qc_active
= ap
->qc_active
;
1042 ap
->active_tag
= ATA_TAG_POISON
;
1046 /* prepare & issue qc */
1049 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1050 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1051 qc
->dma_dir
= dma_dir
;
1052 if (dma_dir
!= DMA_NONE
) {
1053 ata_sg_init_one(qc
, buf
, buflen
);
1054 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1057 qc
->private_data
= &wait
;
1058 qc
->complete_fn
= ata_qc_complete_internal
;
1062 spin_unlock_irqrestore(ap
->lock
, flags
);
1064 rc
= wait_for_completion_timeout(&wait
, ata_probe_timeout
);
1066 ata_port_flush_task(ap
);
1069 spin_lock_irqsave(ap
->lock
, flags
);
1071 /* We're racing with irq here. If we lose, the
1072 * following test prevents us from completing the qc
1073 * twice. If we win, the port is frozen and will be
1074 * cleaned up by ->post_internal_cmd().
1076 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1077 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1079 if (ap
->ops
->error_handler
)
1080 ata_port_freeze(ap
);
1082 ata_qc_complete(qc
);
1084 if (ata_msg_warn(ap
))
1085 ata_dev_printk(dev
, KERN_WARNING
,
1086 "qc timeout (cmd 0x%x)\n", command
);
1089 spin_unlock_irqrestore(ap
->lock
, flags
);
1092 /* do post_internal_cmd */
1093 if (ap
->ops
->post_internal_cmd
)
1094 ap
->ops
->post_internal_cmd(qc
);
1096 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1097 if (ata_msg_warn(ap
))
1098 ata_dev_printk(dev
, KERN_WARNING
,
1099 "zero err_mask for failed "
1100 "internal command, assuming AC_ERR_OTHER\n");
1101 qc
->err_mask
|= AC_ERR_OTHER
;
1105 spin_lock_irqsave(ap
->lock
, flags
);
1107 *tf
= qc
->result_tf
;
1108 err_mask
= qc
->err_mask
;
1111 ap
->active_tag
= preempted_tag
;
1112 ap
->sactive
= preempted_sactive
;
1113 ap
->qc_active
= preempted_qc_active
;
1115 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1116 * Until those drivers are fixed, we detect the condition
1117 * here, fail the command with AC_ERR_SYSTEM and reenable the
1120 * Note that this doesn't change any behavior as internal
1121 * command failure results in disabling the device in the
1122 * higher layer for LLDDs without new reset/EH callbacks.
1124 * Kill the following code as soon as those drivers are fixed.
1126 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1127 err_mask
|= AC_ERR_SYSTEM
;
1131 spin_unlock_irqrestore(ap
->lock
, flags
);
1137 * ata_do_simple_cmd - execute simple internal command
1138 * @dev: Device to which the command is sent
1139 * @cmd: Opcode to execute
1141 * Execute a 'simple' command, that only consists of the opcode
1142 * 'cmd' itself, without filling any other registers
1145 * Kernel thread context (may sleep).
1148 * Zero on success, AC_ERR_* mask on failure
1150 unsigned int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1152 struct ata_taskfile tf
;
1154 ata_tf_init(dev
, &tf
);
1157 tf
.flags
|= ATA_TFLAG_DEVICE
;
1158 tf
.protocol
= ATA_PROT_NODATA
;
1160 return ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1164 * ata_pio_need_iordy - check if iordy needed
1167 * Check if the current speed of the device requires IORDY. Used
1168 * by various controllers for chip configuration.
1171 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1174 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1181 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1183 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1184 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1185 /* Is the speed faster than the drive allows non IORDY ? */
1187 /* This is cycle times not frequency - watch the logic! */
1188 if (pio
> 240) /* PIO2 is 240nS per cycle */
1197 * ata_dev_read_id - Read ID data from the specified device
1198 * @dev: target device
1199 * @p_class: pointer to class of the target device (may be changed)
1200 * @post_reset: is this read ID post-reset?
1201 * @id: buffer to read IDENTIFY data into
1203 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1204 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1205 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1206 * for pre-ATA4 drives.
1209 * Kernel thread context (may sleep)
1212 * 0 on success, -errno otherwise.
1214 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1215 int post_reset
, u16
*id
)
1217 struct ata_port
*ap
= dev
->ap
;
1218 unsigned int class = *p_class
;
1219 struct ata_taskfile tf
;
1220 unsigned int err_mask
= 0;
1224 if (ata_msg_ctl(ap
))
1225 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1226 __FUNCTION__
, ap
->id
, dev
->devno
);
1228 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1231 ata_tf_init(dev
, &tf
);
1235 tf
.command
= ATA_CMD_ID_ATA
;
1238 tf
.command
= ATA_CMD_ID_ATAPI
;
1242 reason
= "unsupported class";
1246 tf
.protocol
= ATA_PROT_PIO
;
1248 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1249 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1252 reason
= "I/O error";
1256 swap_buf_le16(id
, ATA_ID_WORDS
);
1259 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1261 reason
= "device reports illegal type";
1265 if (post_reset
&& class == ATA_DEV_ATA
) {
1267 * The exact sequence expected by certain pre-ATA4 drives is:
1270 * INITIALIZE DEVICE PARAMETERS
1272 * Some drives were very specific about that exact sequence.
1274 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1275 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1278 reason
= "INIT_DEV_PARAMS failed";
1282 /* current CHS translation info (id[53-58]) might be
1283 * changed. reread the identify device info.
1295 if (ata_msg_warn(ap
))
1296 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1297 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1301 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1303 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1306 static void ata_dev_config_ncq(struct ata_device
*dev
,
1307 char *desc
, size_t desc_sz
)
1309 struct ata_port
*ap
= dev
->ap
;
1310 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1312 if (!ata_id_has_ncq(dev
->id
)) {
1317 if (ap
->flags
& ATA_FLAG_NCQ
) {
1318 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1319 dev
->flags
|= ATA_DFLAG_NCQ
;
1322 if (hdepth
>= ddepth
)
1323 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1325 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1329 * ata_dev_configure - Configure the specified ATA/ATAPI device
1330 * @dev: Target device to configure
1331 * @print_info: Enable device info printout
1333 * Configure @dev according to @dev->id. Generic and low-level
1334 * driver specific fixups are also applied.
1337 * Kernel thread context (may sleep)
1340 * 0 on success, -errno otherwise
1342 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1344 struct ata_port
*ap
= dev
->ap
;
1345 const u16
*id
= dev
->id
;
1346 unsigned int xfer_mask
;
1349 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1350 ata_dev_printk(dev
, KERN_INFO
,
1351 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1352 __FUNCTION__
, ap
->id
, dev
->devno
);
1356 if (ata_msg_probe(ap
))
1357 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1358 __FUNCTION__
, ap
->id
, dev
->devno
);
1360 /* print device capabilities */
1361 if (ata_msg_probe(ap
))
1362 ata_dev_printk(dev
, KERN_DEBUG
,
1363 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1364 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1366 id
[49], id
[82], id
[83], id
[84],
1367 id
[85], id
[86], id
[87], id
[88]);
1369 /* initialize to-be-configured parameters */
1370 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1371 dev
->max_sectors
= 0;
1379 * common ATA, ATAPI feature tests
1382 /* find max transfer mode; for printk only */
1383 xfer_mask
= ata_id_xfermask(id
);
1385 if (ata_msg_probe(ap
))
1388 /* ATA-specific feature tests */
1389 if (dev
->class == ATA_DEV_ATA
) {
1390 dev
->n_sectors
= ata_id_n_sectors(id
);
1392 if (ata_id_has_lba(id
)) {
1393 const char *lba_desc
;
1397 dev
->flags
|= ATA_DFLAG_LBA
;
1398 if (ata_id_has_lba48(id
)) {
1399 dev
->flags
|= ATA_DFLAG_LBA48
;
1404 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1406 /* print device info to dmesg */
1407 if (ata_msg_info(ap
))
1408 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1409 "max %s, %Lu sectors: %s %s\n",
1410 ata_id_major_version(id
),
1411 ata_mode_string(xfer_mask
),
1412 (unsigned long long)dev
->n_sectors
,
1413 lba_desc
, ncq_desc
);
1417 /* Default translation */
1418 dev
->cylinders
= id
[1];
1420 dev
->sectors
= id
[6];
1422 if (ata_id_current_chs_valid(id
)) {
1423 /* Current CHS translation is valid. */
1424 dev
->cylinders
= id
[54];
1425 dev
->heads
= id
[55];
1426 dev
->sectors
= id
[56];
1429 /* print device info to dmesg */
1430 if (ata_msg_info(ap
))
1431 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1432 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1433 ata_id_major_version(id
),
1434 ata_mode_string(xfer_mask
),
1435 (unsigned long long)dev
->n_sectors
,
1436 dev
->cylinders
, dev
->heads
,
1440 if (dev
->id
[59] & 0x100) {
1441 dev
->multi_count
= dev
->id
[59] & 0xff;
1442 if (ata_msg_info(ap
))
1443 ata_dev_printk(dev
, KERN_INFO
,
1444 "ata%u: dev %u multi count %u\n",
1445 ap
->id
, dev
->devno
, dev
->multi_count
);
1451 /* ATAPI-specific feature tests */
1452 else if (dev
->class == ATA_DEV_ATAPI
) {
1453 char *cdb_intr_string
= "";
1455 rc
= atapi_cdb_len(id
);
1456 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1457 if (ata_msg_warn(ap
))
1458 ata_dev_printk(dev
, KERN_WARNING
,
1459 "unsupported CDB len\n");
1463 dev
->cdb_len
= (unsigned int) rc
;
1465 if (ata_id_cdb_intr(dev
->id
)) {
1466 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1467 cdb_intr_string
= ", CDB intr";
1470 /* print device info to dmesg */
1471 if (ata_msg_info(ap
))
1472 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1473 ata_mode_string(xfer_mask
),
1477 ap
->host
->max_cmd_len
= 0;
1478 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1479 ap
->host
->max_cmd_len
= max_t(unsigned int,
1480 ap
->host
->max_cmd_len
,
1481 ap
->device
[i
].cdb_len
);
1483 /* limit bridge transfers to udma5, 200 sectors */
1484 if (ata_dev_knobble(dev
)) {
1485 if (ata_msg_info(ap
))
1486 ata_dev_printk(dev
, KERN_INFO
,
1487 "applying bridge limits\n");
1488 dev
->udma_mask
&= ATA_UDMA5
;
1489 dev
->max_sectors
= ATA_MAX_SECTORS
;
1492 if (ap
->ops
->dev_config
)
1493 ap
->ops
->dev_config(ap
, dev
);
1495 if (ata_msg_probe(ap
))
1496 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1497 __FUNCTION__
, ata_chk_status(ap
));
1501 if (ata_msg_probe(ap
))
1502 ata_dev_printk(dev
, KERN_DEBUG
,
1503 "%s: EXIT, err\n", __FUNCTION__
);
1508 * ata_bus_probe - Reset and probe ATA bus
1511 * Master ATA bus probing function. Initiates a hardware-dependent
1512 * bus reset, then attempts to identify any devices found on
1516 * PCI/etc. bus probe sem.
1519 * Zero on success, negative errno otherwise.
1522 static int ata_bus_probe(struct ata_port
*ap
)
1524 unsigned int classes
[ATA_MAX_DEVICES
];
1525 int tries
[ATA_MAX_DEVICES
];
1526 int i
, rc
, down_xfermask
;
1527 struct ata_device
*dev
;
1531 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1532 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1537 /* reset and determine device classes */
1538 ap
->ops
->phy_reset(ap
);
1540 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1541 dev
= &ap
->device
[i
];
1543 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1544 dev
->class != ATA_DEV_UNKNOWN
)
1545 classes
[dev
->devno
] = dev
->class;
1547 classes
[dev
->devno
] = ATA_DEV_NONE
;
1549 dev
->class = ATA_DEV_UNKNOWN
;
1554 /* after the reset the device state is PIO 0 and the controller
1555 state is undefined. Record the mode */
1557 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1558 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1560 /* read IDENTIFY page and configure devices */
1561 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1562 dev
= &ap
->device
[i
];
1565 dev
->class = classes
[i
];
1567 if (!ata_dev_enabled(dev
))
1570 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1574 rc
= ata_dev_configure(dev
, 1);
1579 /* configure transfer mode */
1580 rc
= ata_set_mode(ap
, &dev
);
1586 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1587 if (ata_dev_enabled(&ap
->device
[i
]))
1590 /* no device present, disable port */
1591 ata_port_disable(ap
);
1592 ap
->ops
->port_disable(ap
);
1599 tries
[dev
->devno
] = 0;
1602 sata_down_spd_limit(ap
);
1605 tries
[dev
->devno
]--;
1606 if (down_xfermask
&&
1607 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1608 tries
[dev
->devno
] = 0;
1611 if (!tries
[dev
->devno
]) {
1612 ata_down_xfermask_limit(dev
, 1);
1613 ata_dev_disable(dev
);
1620 * ata_port_probe - Mark port as enabled
1621 * @ap: Port for which we indicate enablement
1623 * Modify @ap data structure such that the system
1624 * thinks that the entire port is enabled.
1626 * LOCKING: host_set lock, or some other form of
1630 void ata_port_probe(struct ata_port
*ap
)
1632 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1636 * sata_print_link_status - Print SATA link status
1637 * @ap: SATA port to printk link status about
1639 * This function prints link speed and status of a SATA link.
1644 static void sata_print_link_status(struct ata_port
*ap
)
1646 u32 sstatus
, scontrol
, tmp
;
1648 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1650 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1652 if (ata_port_online(ap
)) {
1653 tmp
= (sstatus
>> 4) & 0xf;
1654 ata_port_printk(ap
, KERN_INFO
,
1655 "SATA link up %s (SStatus %X SControl %X)\n",
1656 sata_spd_string(tmp
), sstatus
, scontrol
);
1658 ata_port_printk(ap
, KERN_INFO
,
1659 "SATA link down (SStatus %X SControl %X)\n",
1665 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1666 * @ap: SATA port associated with target SATA PHY.
1668 * This function issues commands to standard SATA Sxxx
1669 * PHY registers, to wake up the phy (and device), and
1670 * clear any reset condition.
1673 * PCI/etc. bus probe sem.
1676 void __sata_phy_reset(struct ata_port
*ap
)
1679 unsigned long timeout
= jiffies
+ (HZ
* 5);
1681 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1682 /* issue phy wake/reset */
1683 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1684 /* Couldn't find anything in SATA I/II specs, but
1685 * AHCI-1.1 10.4.2 says at least 1 ms. */
1688 /* phy wake/clear reset */
1689 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1691 /* wait for phy to become ready, if necessary */
1694 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1695 if ((sstatus
& 0xf) != 1)
1697 } while (time_before(jiffies
, timeout
));
1699 /* print link status */
1700 sata_print_link_status(ap
);
1702 /* TODO: phy layer with polling, timeouts, etc. */
1703 if (!ata_port_offline(ap
))
1706 ata_port_disable(ap
);
1708 if (ap
->flags
& ATA_FLAG_DISABLED
)
1711 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1712 ata_port_disable(ap
);
1716 ap
->cbl
= ATA_CBL_SATA
;
1720 * sata_phy_reset - Reset SATA bus.
1721 * @ap: SATA port associated with target SATA PHY.
1723 * This function resets the SATA bus, and then probes
1724 * the bus for devices.
1727 * PCI/etc. bus probe sem.
1730 void sata_phy_reset(struct ata_port
*ap
)
1732 __sata_phy_reset(ap
);
1733 if (ap
->flags
& ATA_FLAG_DISABLED
)
1739 * ata_dev_pair - return other device on cable
1742 * Obtain the other device on the same cable, or if none is
1743 * present NULL is returned
1746 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1748 struct ata_port
*ap
= adev
->ap
;
1749 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1750 if (!ata_dev_enabled(pair
))
1756 * ata_port_disable - Disable port.
1757 * @ap: Port to be disabled.
1759 * Modify @ap data structure such that the system
1760 * thinks that the entire port is disabled, and should
1761 * never attempt to probe or communicate with devices
1764 * LOCKING: host_set lock, or some other form of
1768 void ata_port_disable(struct ata_port
*ap
)
1770 ap
->device
[0].class = ATA_DEV_NONE
;
1771 ap
->device
[1].class = ATA_DEV_NONE
;
1772 ap
->flags
|= ATA_FLAG_DISABLED
;
1776 * sata_down_spd_limit - adjust SATA spd limit downward
1777 * @ap: Port to adjust SATA spd limit for
1779 * Adjust SATA spd limit of @ap downward. Note that this
1780 * function only adjusts the limit. The change must be applied
1781 * using sata_set_spd().
1784 * Inherited from caller.
1787 * 0 on success, negative errno on failure
1789 int sata_down_spd_limit(struct ata_port
*ap
)
1791 u32 sstatus
, spd
, mask
;
1794 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1798 mask
= ap
->sata_spd_limit
;
1801 highbit
= fls(mask
) - 1;
1802 mask
&= ~(1 << highbit
);
1804 spd
= (sstatus
>> 4) & 0xf;
1808 mask
&= (1 << spd
) - 1;
1812 ap
->sata_spd_limit
= mask
;
1814 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1815 sata_spd_string(fls(mask
)));
1820 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1824 if (ap
->sata_spd_limit
== UINT_MAX
)
1827 limit
= fls(ap
->sata_spd_limit
);
1829 spd
= (*scontrol
>> 4) & 0xf;
1830 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1832 return spd
!= limit
;
1836 * sata_set_spd_needed - is SATA spd configuration needed
1837 * @ap: Port in question
1839 * Test whether the spd limit in SControl matches
1840 * @ap->sata_spd_limit. This function is used to determine
1841 * whether hardreset is necessary to apply SATA spd
1845 * Inherited from caller.
1848 * 1 if SATA spd configuration is needed, 0 otherwise.
1850 int sata_set_spd_needed(struct ata_port
*ap
)
1854 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1857 return __sata_set_spd_needed(ap
, &scontrol
);
1861 * sata_set_spd - set SATA spd according to spd limit
1862 * @ap: Port to set SATA spd for
1864 * Set SATA spd of @ap according to sata_spd_limit.
1867 * Inherited from caller.
1870 * 0 if spd doesn't need to be changed, 1 if spd has been
1871 * changed. Negative errno if SCR registers are inaccessible.
1873 int sata_set_spd(struct ata_port
*ap
)
1878 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1881 if (!__sata_set_spd_needed(ap
, &scontrol
))
1884 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1891 * This mode timing computation functionality is ported over from
1892 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1895 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1896 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1897 * for PIO 5, which is a nonstandard extension and UDMA6, which
1898 * is currently supported only by Maxtor drives.
1901 static const struct ata_timing ata_timing
[] = {
1903 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1904 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1905 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1906 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1908 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1909 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1910 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1912 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1914 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1915 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1916 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1918 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1919 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1920 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1922 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1923 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1924 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1926 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1927 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1928 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1930 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1935 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1936 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1938 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1940 q
->setup
= EZ(t
->setup
* 1000, T
);
1941 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1942 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1943 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1944 q
->active
= EZ(t
->active
* 1000, T
);
1945 q
->recover
= EZ(t
->recover
* 1000, T
);
1946 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1947 q
->udma
= EZ(t
->udma
* 1000, UT
);
1950 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1951 struct ata_timing
*m
, unsigned int what
)
1953 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1954 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1955 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1956 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1957 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1958 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1959 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1960 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1963 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1965 const struct ata_timing
*t
;
1967 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1968 if (t
->mode
== 0xFF)
1973 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1974 struct ata_timing
*t
, int T
, int UT
)
1976 const struct ata_timing
*s
;
1977 struct ata_timing p
;
1983 if (!(s
= ata_timing_find_mode(speed
)))
1986 memcpy(t
, s
, sizeof(*s
));
1989 * If the drive is an EIDE drive, it can tell us it needs extended
1990 * PIO/MW_DMA cycle timing.
1993 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1994 memset(&p
, 0, sizeof(p
));
1995 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1996 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1997 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1998 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1999 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
2001 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
2005 * Convert the timing to bus clock counts.
2008 ata_timing_quantize(t
, t
, T
, UT
);
2011 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2012 * S.M.A.R.T * and some other commands. We have to ensure that the
2013 * DMA cycle timing is slower/equal than the fastest PIO timing.
2016 if (speed
> XFER_PIO_4
) {
2017 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2018 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2022 * Lengthen active & recovery time so that cycle time is correct.
2025 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2026 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2027 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2030 if (t
->active
+ t
->recover
< t
->cycle
) {
2031 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2032 t
->recover
= t
->cycle
- t
->active
;
2039 * ata_down_xfermask_limit - adjust dev xfer masks downward
2040 * @dev: Device to adjust xfer masks
2041 * @force_pio0: Force PIO0
2043 * Adjust xfer masks of @dev downward. Note that this function
2044 * does not apply the change. Invoking ata_set_mode() afterwards
2045 * will apply the limit.
2048 * Inherited from caller.
2051 * 0 on success, negative errno on failure
2053 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2055 unsigned long xfer_mask
;
2058 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2063 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2064 if (xfer_mask
& ATA_MASK_UDMA
)
2065 xfer_mask
&= ~ATA_MASK_MWDMA
;
2067 highbit
= fls(xfer_mask
) - 1;
2068 xfer_mask
&= ~(1 << highbit
);
2070 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2074 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2077 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2078 ata_mode_string(xfer_mask
));
2086 static int ata_dev_set_mode(struct ata_device
*dev
)
2088 unsigned int err_mask
;
2091 dev
->flags
&= ~ATA_DFLAG_PIO
;
2092 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2093 dev
->flags
|= ATA_DFLAG_PIO
;
2095 err_mask
= ata_dev_set_xfermode(dev
);
2097 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2098 "(err_mask=0x%x)\n", err_mask
);
2102 rc
= ata_dev_revalidate(dev
, 0);
2106 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2107 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2109 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2110 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2115 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2116 * @ap: port on which timings will be programmed
2117 * @r_failed_dev: out paramter for failed device
2119 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2120 * ata_set_mode() fails, pointer to the failing device is
2121 * returned in @r_failed_dev.
2124 * PCI/etc. bus probe sem.
2127 * 0 on success, negative errno otherwise
2129 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2131 struct ata_device
*dev
;
2132 int i
, rc
= 0, used_dma
= 0, found
= 0;
2134 /* has private set_mode? */
2135 if (ap
->ops
->set_mode
) {
2136 /* FIXME: make ->set_mode handle no device case and
2137 * return error code and failing device on failure.
2139 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2140 if (ata_dev_enabled(&ap
->device
[i
])) {
2141 ap
->ops
->set_mode(ap
);
2148 /* step 1: calculate xfer_mask */
2149 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2150 unsigned int pio_mask
, dma_mask
;
2152 dev
= &ap
->device
[i
];
2154 if (!ata_dev_enabled(dev
))
2157 ata_dev_xfermask(dev
);
2159 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2160 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2161 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2162 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2171 /* step 2: always set host PIO timings */
2172 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2173 dev
= &ap
->device
[i
];
2174 if (!ata_dev_enabled(dev
))
2177 if (!dev
->pio_mode
) {
2178 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2183 dev
->xfer_mode
= dev
->pio_mode
;
2184 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2185 if (ap
->ops
->set_piomode
)
2186 ap
->ops
->set_piomode(ap
, dev
);
2189 /* step 3: set host DMA timings */
2190 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2191 dev
= &ap
->device
[i
];
2193 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2196 dev
->xfer_mode
= dev
->dma_mode
;
2197 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2198 if (ap
->ops
->set_dmamode
)
2199 ap
->ops
->set_dmamode(ap
, dev
);
2202 /* step 4: update devices' xfer mode */
2203 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2204 dev
= &ap
->device
[i
];
2206 if (!ata_dev_enabled(dev
))
2209 rc
= ata_dev_set_mode(dev
);
2214 /* Record simplex status. If we selected DMA then the other
2215 * host channels are not permitted to do so.
2217 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2218 ap
->host_set
->simplex_claimed
= 1;
2220 /* step5: chip specific finalisation */
2221 if (ap
->ops
->post_set_mode
)
2222 ap
->ops
->post_set_mode(ap
);
2226 *r_failed_dev
= dev
;
2231 * ata_tf_to_host - issue ATA taskfile to host controller
2232 * @ap: port to which command is being issued
2233 * @tf: ATA taskfile register set
2235 * Issues ATA taskfile register set to ATA host controller,
2236 * with proper synchronization with interrupt handler and
2240 * spin_lock_irqsave(host_set lock)
2243 static inline void ata_tf_to_host(struct ata_port
*ap
,
2244 const struct ata_taskfile
*tf
)
2246 ap
->ops
->tf_load(ap
, tf
);
2247 ap
->ops
->exec_command(ap
, tf
);
2251 * ata_busy_sleep - sleep until BSY clears, or timeout
2252 * @ap: port containing status register to be polled
2253 * @tmout_pat: impatience timeout
2254 * @tmout: overall timeout
2256 * Sleep until ATA Status register bit BSY clears,
2257 * or a timeout occurs.
2262 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2263 unsigned long tmout_pat
, unsigned long tmout
)
2265 unsigned long timer_start
, timeout
;
2268 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2269 timer_start
= jiffies
;
2270 timeout
= timer_start
+ tmout_pat
;
2271 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2273 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2276 if (status
& ATA_BUSY
)
2277 ata_port_printk(ap
, KERN_WARNING
,
2278 "port is slow to respond, please be patient\n");
2280 timeout
= timer_start
+ tmout
;
2281 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2283 status
= ata_chk_status(ap
);
2286 if (status
& ATA_BUSY
) {
2287 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2288 "(%lu secs)\n", tmout
/ HZ
);
2295 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2297 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2298 unsigned int dev0
= devmask
& (1 << 0);
2299 unsigned int dev1
= devmask
& (1 << 1);
2300 unsigned long timeout
;
2302 /* if device 0 was found in ata_devchk, wait for its
2306 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2308 /* if device 1 was found in ata_devchk, wait for
2309 * register access, then wait for BSY to clear
2311 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2315 ap
->ops
->dev_select(ap
, 1);
2316 if (ap
->flags
& ATA_FLAG_MMIO
) {
2317 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2318 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2320 nsect
= inb(ioaddr
->nsect_addr
);
2321 lbal
= inb(ioaddr
->lbal_addr
);
2323 if ((nsect
== 1) && (lbal
== 1))
2325 if (time_after(jiffies
, timeout
)) {
2329 msleep(50); /* give drive a breather */
2332 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2334 /* is all this really necessary? */
2335 ap
->ops
->dev_select(ap
, 0);
2337 ap
->ops
->dev_select(ap
, 1);
2339 ap
->ops
->dev_select(ap
, 0);
2342 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2343 unsigned int devmask
)
2345 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2347 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2349 /* software reset. causes dev0 to be selected */
2350 if (ap
->flags
& ATA_FLAG_MMIO
) {
2351 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2352 udelay(20); /* FIXME: flush */
2353 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2354 udelay(20); /* FIXME: flush */
2355 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2357 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2359 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2361 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2364 /* spec mandates ">= 2ms" before checking status.
2365 * We wait 150ms, because that was the magic delay used for
2366 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2367 * between when the ATA command register is written, and then
2368 * status is checked. Because waiting for "a while" before
2369 * checking status is fine, post SRST, we perform this magic
2370 * delay here as well.
2372 * Old drivers/ide uses the 2mS rule and then waits for ready
2376 /* Before we perform post reset processing we want to see if
2377 * the bus shows 0xFF because the odd clown forgets the D7
2378 * pulldown resistor.
2380 if (ata_check_status(ap
) == 0xFF) {
2381 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2382 return AC_ERR_OTHER
;
2385 ata_bus_post_reset(ap
, devmask
);
2391 * ata_bus_reset - reset host port and associated ATA channel
2392 * @ap: port to reset
2394 * This is typically the first time we actually start issuing
2395 * commands to the ATA channel. We wait for BSY to clear, then
2396 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2397 * result. Determine what devices, if any, are on the channel
2398 * by looking at the device 0/1 error register. Look at the signature
2399 * stored in each device's taskfile registers, to determine if
2400 * the device is ATA or ATAPI.
2403 * PCI/etc. bus probe sem.
2404 * Obtains host_set lock.
2407 * Sets ATA_FLAG_DISABLED if bus reset fails.
2410 void ata_bus_reset(struct ata_port
*ap
)
2412 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2413 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2415 unsigned int dev0
, dev1
= 0, devmask
= 0;
2417 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2419 /* determine if device 0/1 are present */
2420 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2423 dev0
= ata_devchk(ap
, 0);
2425 dev1
= ata_devchk(ap
, 1);
2429 devmask
|= (1 << 0);
2431 devmask
|= (1 << 1);
2433 /* select device 0 again */
2434 ap
->ops
->dev_select(ap
, 0);
2436 /* issue bus reset */
2437 if (ap
->flags
& ATA_FLAG_SRST
)
2438 if (ata_bus_softreset(ap
, devmask
))
2442 * determine by signature whether we have ATA or ATAPI devices
2444 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2445 if ((slave_possible
) && (err
!= 0x81))
2446 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2448 /* re-enable interrupts */
2449 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2452 /* is double-select really necessary? */
2453 if (ap
->device
[1].class != ATA_DEV_NONE
)
2454 ap
->ops
->dev_select(ap
, 1);
2455 if (ap
->device
[0].class != ATA_DEV_NONE
)
2456 ap
->ops
->dev_select(ap
, 0);
2458 /* if no devices were detected, disable this port */
2459 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2460 (ap
->device
[1].class == ATA_DEV_NONE
))
2463 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2464 /* set up device control for ATA_FLAG_SATA_RESET */
2465 if (ap
->flags
& ATA_FLAG_MMIO
)
2466 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2468 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2475 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2476 ap
->ops
->port_disable(ap
);
2482 * sata_phy_debounce - debounce SATA phy status
2483 * @ap: ATA port to debounce SATA phy status for
2484 * @params: timing parameters { interval, duratinon, timeout } in msec
2486 * Make sure SStatus of @ap reaches stable state, determined by
2487 * holding the same value where DET is not 1 for @duration polled
2488 * every @interval, before @timeout. Timeout constraints the
2489 * beginning of the stable state. Because, after hot unplugging,
2490 * DET gets stuck at 1 on some controllers, this functions waits
2491 * until timeout then returns 0 if DET is stable at 1.
2494 * Kernel thread context (may sleep)
2497 * 0 on success, -errno on failure.
2499 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2501 unsigned long interval_msec
= params
[0];
2502 unsigned long duration
= params
[1] * HZ
/ 1000;
2503 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2504 unsigned long last_jiffies
;
2508 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2513 last_jiffies
= jiffies
;
2516 msleep(interval_msec
);
2517 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2523 if (cur
== 1 && time_before(jiffies
, timeout
))
2525 if (time_after(jiffies
, last_jiffies
+ duration
))
2530 /* unstable, start over */
2532 last_jiffies
= jiffies
;
2535 if (time_after(jiffies
, timeout
))
2541 * sata_phy_resume - resume SATA phy
2542 * @ap: ATA port to resume SATA phy for
2543 * @params: timing parameters { interval, duratinon, timeout } in msec
2545 * Resume SATA phy of @ap and debounce it.
2548 * Kernel thread context (may sleep)
2551 * 0 on success, -errno on failure.
2553 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2558 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2561 scontrol
= (scontrol
& 0x0f0) | 0x300;
2563 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2566 /* Some PHYs react badly if SStatus is pounded immediately
2567 * after resuming. Delay 200ms before debouncing.
2571 return sata_phy_debounce(ap
, params
);
2574 static void ata_wait_spinup(struct ata_port
*ap
)
2576 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2577 unsigned long end
, secs
;
2580 /* first, debounce phy if SATA */
2581 if (ap
->cbl
== ATA_CBL_SATA
) {
2582 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2584 /* if debounced successfully and offline, no need to wait */
2585 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2589 /* okay, let's give the drive time to spin up */
2590 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2591 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2593 if (time_after(jiffies
, end
))
2597 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2598 "(%lu secs)\n", secs
);
2600 schedule_timeout_uninterruptible(end
- jiffies
);
2604 * ata_std_prereset - prepare for reset
2605 * @ap: ATA port to be reset
2607 * @ap is about to be reset. Initialize it.
2610 * Kernel thread context (may sleep)
2613 * 0 on success, -errno otherwise.
2615 int ata_std_prereset(struct ata_port
*ap
)
2617 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2618 const unsigned long *timing
;
2622 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2623 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2624 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2625 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2626 ata_wait_spinup(ap
);
2629 /* if we're about to do hardreset, nothing more to do */
2630 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2633 /* if SATA, resume phy */
2634 if (ap
->cbl
== ATA_CBL_SATA
) {
2635 if (ap
->flags
& ATA_FLAG_LOADING
)
2636 timing
= sata_deb_timing_boot
;
2638 timing
= sata_deb_timing_eh
;
2640 rc
= sata_phy_resume(ap
, timing
);
2641 if (rc
&& rc
!= -EOPNOTSUPP
) {
2642 /* phy resume failed */
2643 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2644 "link for reset (errno=%d)\n", rc
);
2649 /* Wait for !BSY if the controller can wait for the first D2H
2650 * Reg FIS and we don't know that no device is attached.
2652 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2653 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2659 * ata_std_softreset - reset host port via ATA SRST
2660 * @ap: port to reset
2661 * @classes: resulting classes of attached devices
2663 * Reset host port using ATA SRST.
2666 * Kernel thread context (may sleep)
2669 * 0 on success, -errno otherwise.
2671 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2673 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2674 unsigned int devmask
= 0, err_mask
;
2679 if (ata_port_offline(ap
)) {
2680 classes
[0] = ATA_DEV_NONE
;
2684 /* determine if device 0/1 are present */
2685 if (ata_devchk(ap
, 0))
2686 devmask
|= (1 << 0);
2687 if (slave_possible
&& ata_devchk(ap
, 1))
2688 devmask
|= (1 << 1);
2690 /* select device 0 again */
2691 ap
->ops
->dev_select(ap
, 0);
2693 /* issue bus reset */
2694 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2695 err_mask
= ata_bus_softreset(ap
, devmask
);
2697 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2702 /* determine by signature whether we have ATA or ATAPI devices */
2703 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2704 if (slave_possible
&& err
!= 0x81)
2705 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2708 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2713 * sata_std_hardreset - reset host port via SATA phy reset
2714 * @ap: port to reset
2715 * @class: resulting class of attached device
2717 * SATA phy-reset host port using DET bits of SControl register.
2720 * Kernel thread context (may sleep)
2723 * 0 on success, -errno otherwise.
2725 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2732 if (sata_set_spd_needed(ap
)) {
2733 /* SATA spec says nothing about how to reconfigure
2734 * spd. To be on the safe side, turn off phy during
2735 * reconfiguration. This works for at least ICH7 AHCI
2738 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2741 scontrol
= (scontrol
& 0x0f0) | 0x302;
2743 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2749 /* issue phy wake/reset */
2750 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2753 scontrol
= (scontrol
& 0x0f0) | 0x301;
2755 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2758 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2759 * 10.4.2 says at least 1 ms.
2763 /* bring phy back */
2764 sata_phy_resume(ap
, sata_deb_timing_eh
);
2766 /* TODO: phy layer with polling, timeouts, etc. */
2767 if (ata_port_offline(ap
)) {
2768 *class = ATA_DEV_NONE
;
2769 DPRINTK("EXIT, link offline\n");
2773 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2774 ata_port_printk(ap
, KERN_ERR
,
2775 "COMRESET failed (device not ready)\n");
2779 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2781 *class = ata_dev_try_classify(ap
, 0, NULL
);
2783 DPRINTK("EXIT, class=%u\n", *class);
2788 * ata_std_postreset - standard postreset callback
2789 * @ap: the target ata_port
2790 * @classes: classes of attached devices
2792 * This function is invoked after a successful reset. Note that
2793 * the device might have been reset more than once using
2794 * different reset methods before postreset is invoked.
2797 * Kernel thread context (may sleep)
2799 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2805 /* print link status */
2806 sata_print_link_status(ap
);
2809 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2810 sata_scr_write(ap
, SCR_ERROR
, serror
);
2812 /* re-enable interrupts */
2813 if (!ap
->ops
->error_handler
) {
2814 /* FIXME: hack. create a hook instead */
2815 if (ap
->ioaddr
.ctl_addr
)
2819 /* is double-select really necessary? */
2820 if (classes
[0] != ATA_DEV_NONE
)
2821 ap
->ops
->dev_select(ap
, 1);
2822 if (classes
[1] != ATA_DEV_NONE
)
2823 ap
->ops
->dev_select(ap
, 0);
2825 /* bail out if no device is present */
2826 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2827 DPRINTK("EXIT, no device\n");
2831 /* set up device control */
2832 if (ap
->ioaddr
.ctl_addr
) {
2833 if (ap
->flags
& ATA_FLAG_MMIO
)
2834 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2836 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2843 * ata_dev_same_device - Determine whether new ID matches configured device
2844 * @dev: device to compare against
2845 * @new_class: class of the new device
2846 * @new_id: IDENTIFY page of the new device
2848 * Compare @new_class and @new_id against @dev and determine
2849 * whether @dev is the device indicated by @new_class and
2856 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2858 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2861 const u16
*old_id
= dev
->id
;
2862 unsigned char model
[2][41], serial
[2][21];
2865 if (dev
->class != new_class
) {
2866 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2867 dev
->class, new_class
);
2871 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2872 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2873 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2874 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2875 new_n_sectors
= ata_id_n_sectors(new_id
);
2877 if (strcmp(model
[0], model
[1])) {
2878 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2879 "'%s' != '%s'\n", model
[0], model
[1]);
2883 if (strcmp(serial
[0], serial
[1])) {
2884 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2885 "'%s' != '%s'\n", serial
[0], serial
[1]);
2889 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2890 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2892 (unsigned long long)dev
->n_sectors
,
2893 (unsigned long long)new_n_sectors
);
2901 * ata_dev_revalidate - Revalidate ATA device
2902 * @dev: device to revalidate
2903 * @post_reset: is this revalidation after reset?
2905 * Re-read IDENTIFY page and make sure @dev is still attached to
2909 * Kernel thread context (may sleep)
2912 * 0 on success, negative errno otherwise
2914 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2916 unsigned int class = dev
->class;
2917 u16
*id
= (void *)dev
->ap
->sector_buf
;
2920 if (!ata_dev_enabled(dev
)) {
2926 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2930 /* is the device still there? */
2931 if (!ata_dev_same_device(dev
, class, id
)) {
2936 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2938 /* configure device according to the new ID */
2939 rc
= ata_dev_configure(dev
, 0);
2944 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2948 static const char * const ata_dma_blacklist
[] = {
2949 "WDC AC11000H", NULL
,
2950 "WDC AC22100H", NULL
,
2951 "WDC AC32500H", NULL
,
2952 "WDC AC33100H", NULL
,
2953 "WDC AC31600H", NULL
,
2954 "WDC AC32100H", "24.09P07",
2955 "WDC AC23200L", "21.10N21",
2956 "Compaq CRD-8241B", NULL
,
2961 "SanDisk SDP3B", NULL
,
2962 "SanDisk SDP3B-64", NULL
,
2963 "SANYO CD-ROM CRD", NULL
,
2964 "HITACHI CDR-8", NULL
,
2965 "HITACHI CDR-8335", NULL
,
2966 "HITACHI CDR-8435", NULL
,
2967 "Toshiba CD-ROM XM-6202B", NULL
,
2968 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2970 "E-IDE CD-ROM CR-840", NULL
,
2971 "CD-ROM Drive/F5A", NULL
,
2972 "WPI CDD-820", NULL
,
2973 "SAMSUNG CD-ROM SC-148C", NULL
,
2974 "SAMSUNG CD-ROM SC", NULL
,
2975 "SanDisk SDP3B-64", NULL
,
2976 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2977 "_NEC DV5800A", NULL
,
2978 "SAMSUNG CD-ROM SN-124", "N001"
2981 static int ata_strim(char *s
, size_t len
)
2983 len
= strnlen(s
, len
);
2985 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2986 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2993 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2995 unsigned char model_num
[40];
2996 unsigned char model_rev
[16];
2997 unsigned int nlen
, rlen
;
3000 /* We don't support polling DMA.
3001 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3002 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3004 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3005 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
3008 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3010 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3012 nlen
= ata_strim(model_num
, sizeof(model_num
));
3013 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3015 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3016 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3017 if (ata_dma_blacklist
[i
+1] == NULL
)
3019 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3027 * ata_dev_xfermask - Compute supported xfermask of the given device
3028 * @dev: Device to compute xfermask for
3030 * Compute supported xfermask of @dev and store it in
3031 * dev->*_mask. This function is responsible for applying all
3032 * known limits including host controller limits, device
3035 * FIXME: The current implementation limits all transfer modes to
3036 * the fastest of the lowested device on the port. This is not
3037 * required on most controllers.
3042 static void ata_dev_xfermask(struct ata_device
*dev
)
3044 struct ata_port
*ap
= dev
->ap
;
3045 struct ata_host_set
*hs
= ap
->host_set
;
3046 unsigned long xfer_mask
;
3049 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3050 ap
->mwdma_mask
, ap
->udma_mask
);
3052 /* Apply cable rule here. Don't apply it early because when
3053 * we handle hot plug the cable type can itself change.
3055 if (ap
->cbl
== ATA_CBL_PATA40
)
3056 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3058 /* FIXME: Use port-wide xfermask for now */
3059 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3060 struct ata_device
*d
= &ap
->device
[i
];
3062 if (ata_dev_absent(d
))
3065 if (ata_dev_disabled(d
)) {
3066 /* to avoid violating device selection timing */
3067 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3068 UINT_MAX
, UINT_MAX
);
3072 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3073 d
->mwdma_mask
, d
->udma_mask
);
3074 xfer_mask
&= ata_id_xfermask(d
->id
);
3075 if (ata_dma_blacklisted(d
))
3076 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3079 if (ata_dma_blacklisted(dev
))
3080 ata_dev_printk(dev
, KERN_WARNING
,
3081 "device is on DMA blacklist, disabling DMA\n");
3083 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3084 if (hs
->simplex_claimed
)
3085 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3088 if (ap
->ops
->mode_filter
)
3089 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3091 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3092 &dev
->mwdma_mask
, &dev
->udma_mask
);
3096 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3097 * @dev: Device to which command will be sent
3099 * Issue SET FEATURES - XFER MODE command to device @dev
3103 * PCI/etc. bus probe sem.
3106 * 0 on success, AC_ERR_* mask otherwise.
3109 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3111 struct ata_taskfile tf
;
3112 unsigned int err_mask
;
3114 /* set up set-features taskfile */
3115 DPRINTK("set features - xfer mode\n");
3117 ata_tf_init(dev
, &tf
);
3118 tf
.command
= ATA_CMD_SET_FEATURES
;
3119 tf
.feature
= SETFEATURES_XFER
;
3120 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3121 tf
.protocol
= ATA_PROT_NODATA
;
3122 tf
.nsect
= dev
->xfer_mode
;
3124 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3126 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3131 * ata_dev_init_params - Issue INIT DEV PARAMS command
3132 * @dev: Device to which command will be sent
3133 * @heads: Number of heads (taskfile parameter)
3134 * @sectors: Number of sectors (taskfile parameter)
3137 * Kernel thread context (may sleep)
3140 * 0 on success, AC_ERR_* mask otherwise.
3142 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3143 u16 heads
, u16 sectors
)
3145 struct ata_taskfile tf
;
3146 unsigned int err_mask
;
3148 /* Number of sectors per track 1-255. Number of heads 1-16 */
3149 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3150 return AC_ERR_INVALID
;
3152 /* set up init dev params taskfile */
3153 DPRINTK("init dev params \n");
3155 ata_tf_init(dev
, &tf
);
3156 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3157 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3158 tf
.protocol
= ATA_PROT_NODATA
;
3160 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3162 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3164 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3169 * ata_sg_clean - Unmap DMA memory associated with command
3170 * @qc: Command containing DMA memory to be released
3172 * Unmap all mapped DMA memory associated with this command.
3175 * spin_lock_irqsave(host_set lock)
3178 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3180 struct ata_port
*ap
= qc
->ap
;
3181 struct scatterlist
*sg
= qc
->__sg
;
3182 int dir
= qc
->dma_dir
;
3183 void *pad_buf
= NULL
;
3185 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3186 WARN_ON(sg
== NULL
);
3188 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3189 WARN_ON(qc
->n_elem
> 1);
3191 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3193 /* if we padded the buffer out to 32-bit bound, and data
3194 * xfer direction is from-device, we must copy from the
3195 * pad buffer back into the supplied buffer
3197 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3198 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3200 if (qc
->flags
& ATA_QCFLAG_SG
) {
3202 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3203 /* restore last sg */
3204 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3206 struct scatterlist
*psg
= &qc
->pad_sgent
;
3207 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3208 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3209 kunmap_atomic(addr
, KM_IRQ0
);
3213 dma_unmap_single(ap
->dev
,
3214 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3217 sg
->length
+= qc
->pad_len
;
3219 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3220 pad_buf
, qc
->pad_len
);
3223 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3228 * ata_fill_sg - Fill PCI IDE PRD table
3229 * @qc: Metadata associated with taskfile to be transferred
3231 * Fill PCI IDE PRD (scatter-gather) table with segments
3232 * associated with the current disk command.
3235 * spin_lock_irqsave(host_set lock)
3238 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3240 struct ata_port
*ap
= qc
->ap
;
3241 struct scatterlist
*sg
;
3244 WARN_ON(qc
->__sg
== NULL
);
3245 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3248 ata_for_each_sg(sg
, qc
) {
3252 /* determine if physical DMA addr spans 64K boundary.
3253 * Note h/w doesn't support 64-bit, so we unconditionally
3254 * truncate dma_addr_t to u32.
3256 addr
= (u32
) sg_dma_address(sg
);
3257 sg_len
= sg_dma_len(sg
);
3260 offset
= addr
& 0xffff;
3262 if ((offset
+ sg_len
) > 0x10000)
3263 len
= 0x10000 - offset
;
3265 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3266 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3267 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3276 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3279 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3280 * @qc: Metadata associated with taskfile to check
3282 * Allow low-level driver to filter ATA PACKET commands, returning
3283 * a status indicating whether or not it is OK to use DMA for the
3284 * supplied PACKET command.
3287 * spin_lock_irqsave(host_set lock)
3289 * RETURNS: 0 when ATAPI DMA can be used
3292 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3294 struct ata_port
*ap
= qc
->ap
;
3295 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3297 if (ap
->ops
->check_atapi_dma
)
3298 rc
= ap
->ops
->check_atapi_dma(qc
);
3303 * ata_qc_prep - Prepare taskfile for submission
3304 * @qc: Metadata associated with taskfile to be prepared
3306 * Prepare ATA taskfile for submission.
3309 * spin_lock_irqsave(host_set lock)
3311 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3313 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3319 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3322 * ata_sg_init_one - Associate command with memory buffer
3323 * @qc: Command to be associated
3324 * @buf: Memory buffer
3325 * @buflen: Length of memory buffer, in bytes.
3327 * Initialize the data-related elements of queued_cmd @qc
3328 * to point to a single memory buffer, @buf of byte length @buflen.
3331 * spin_lock_irqsave(host_set lock)
3334 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3336 struct scatterlist
*sg
;
3338 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3340 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3341 qc
->__sg
= &qc
->sgent
;
3343 qc
->orig_n_elem
= 1;
3345 qc
->nbytes
= buflen
;
3348 sg_init_one(sg
, buf
, buflen
);
3352 * ata_sg_init - Associate command with scatter-gather table.
3353 * @qc: Command to be associated
3354 * @sg: Scatter-gather table.
3355 * @n_elem: Number of elements in s/g table.
3357 * Initialize the data-related elements of queued_cmd @qc
3358 * to point to a scatter-gather table @sg, containing @n_elem
3362 * spin_lock_irqsave(host_set lock)
3365 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3366 unsigned int n_elem
)
3368 qc
->flags
|= ATA_QCFLAG_SG
;
3370 qc
->n_elem
= n_elem
;
3371 qc
->orig_n_elem
= n_elem
;
3375 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3376 * @qc: Command with memory buffer to be mapped.
3378 * DMA-map the memory buffer associated with queued_cmd @qc.
3381 * spin_lock_irqsave(host_set lock)
3384 * Zero on success, negative on error.
3387 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3389 struct ata_port
*ap
= qc
->ap
;
3390 int dir
= qc
->dma_dir
;
3391 struct scatterlist
*sg
= qc
->__sg
;
3392 dma_addr_t dma_address
;
3395 /* we must lengthen transfers to end on a 32-bit boundary */
3396 qc
->pad_len
= sg
->length
& 3;
3398 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3399 struct scatterlist
*psg
= &qc
->pad_sgent
;
3401 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3403 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3405 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3406 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3409 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3410 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3412 sg
->length
-= qc
->pad_len
;
3413 if (sg
->length
== 0)
3416 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3417 sg
->length
, qc
->pad_len
);
3425 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3427 if (dma_mapping_error(dma_address
)) {
3429 sg
->length
+= qc
->pad_len
;
3433 sg_dma_address(sg
) = dma_address
;
3434 sg_dma_len(sg
) = sg
->length
;
3437 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3438 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3444 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3445 * @qc: Command with scatter-gather table to be mapped.
3447 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3450 * spin_lock_irqsave(host_set lock)
3453 * Zero on success, negative on error.
3457 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3459 struct ata_port
*ap
= qc
->ap
;
3460 struct scatterlist
*sg
= qc
->__sg
;
3461 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3462 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3464 VPRINTK("ENTER, ata%u\n", ap
->id
);
3465 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3467 /* we must lengthen transfers to end on a 32-bit boundary */
3468 qc
->pad_len
= lsg
->length
& 3;
3470 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3471 struct scatterlist
*psg
= &qc
->pad_sgent
;
3472 unsigned int offset
;
3474 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3476 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3479 * psg->page/offset are used to copy to-be-written
3480 * data in this function or read data in ata_sg_clean.
3482 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3483 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3484 psg
->offset
= offset_in_page(offset
);
3486 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3487 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3488 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3489 kunmap_atomic(addr
, KM_IRQ0
);
3492 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3493 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3495 lsg
->length
-= qc
->pad_len
;
3496 if (lsg
->length
== 0)
3499 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3500 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3503 pre_n_elem
= qc
->n_elem
;
3504 if (trim_sg
&& pre_n_elem
)
3513 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3515 /* restore last sg */
3516 lsg
->length
+= qc
->pad_len
;
3520 DPRINTK("%d sg elements mapped\n", n_elem
);
3523 qc
->n_elem
= n_elem
;
3529 * swap_buf_le16 - swap halves of 16-bit words in place
3530 * @buf: Buffer to swap
3531 * @buf_words: Number of 16-bit words in buffer.
3533 * Swap halves of 16-bit words if needed to convert from
3534 * little-endian byte order to native cpu byte order, or
3538 * Inherited from caller.
3540 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3545 for (i
= 0; i
< buf_words
; i
++)
3546 buf
[i
] = le16_to_cpu(buf
[i
]);
3547 #endif /* __BIG_ENDIAN */
3551 * ata_mmio_data_xfer - Transfer data by MMIO
3552 * @adev: device for this I/O
3554 * @buflen: buffer length
3555 * @write_data: read/write
3557 * Transfer data from/to the device data register by MMIO.
3560 * Inherited from caller.
3563 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3564 unsigned int buflen
, int write_data
)
3566 struct ata_port
*ap
= adev
->ap
;
3568 unsigned int words
= buflen
>> 1;
3569 u16
*buf16
= (u16
*) buf
;
3570 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3572 /* Transfer multiple of 2 bytes */
3574 for (i
= 0; i
< words
; i
++)
3575 writew(le16_to_cpu(buf16
[i
]), mmio
);
3577 for (i
= 0; i
< words
; i
++)
3578 buf16
[i
] = cpu_to_le16(readw(mmio
));
3581 /* Transfer trailing 1 byte, if any. */
3582 if (unlikely(buflen
& 0x01)) {
3583 u16 align_buf
[1] = { 0 };
3584 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3587 memcpy(align_buf
, trailing_buf
, 1);
3588 writew(le16_to_cpu(align_buf
[0]), mmio
);
3590 align_buf
[0] = cpu_to_le16(readw(mmio
));
3591 memcpy(trailing_buf
, align_buf
, 1);
3597 * ata_pio_data_xfer - Transfer data by PIO
3598 * @adev: device to target
3600 * @buflen: buffer length
3601 * @write_data: read/write
3603 * Transfer data from/to the device data register by PIO.
3606 * Inherited from caller.
3609 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3610 unsigned int buflen
, int write_data
)
3612 struct ata_port
*ap
= adev
->ap
;
3613 unsigned int words
= buflen
>> 1;
3615 /* Transfer multiple of 2 bytes */
3617 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3619 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3621 /* Transfer trailing 1 byte, if any. */
3622 if (unlikely(buflen
& 0x01)) {
3623 u16 align_buf
[1] = { 0 };
3624 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3627 memcpy(align_buf
, trailing_buf
, 1);
3628 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3630 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3631 memcpy(trailing_buf
, align_buf
, 1);
3637 * ata_pio_data_xfer_noirq - Transfer data by PIO
3638 * @adev: device to target
3640 * @buflen: buffer length
3641 * @write_data: read/write
3643 * Transfer data from/to the device data register by PIO. Do the
3644 * transfer with interrupts disabled.
3647 * Inherited from caller.
3650 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3651 unsigned int buflen
, int write_data
)
3653 unsigned long flags
;
3654 local_irq_save(flags
);
3655 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3656 local_irq_restore(flags
);
3661 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3662 * @qc: Command on going
3664 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3667 * Inherited from caller.
3670 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3672 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3673 struct scatterlist
*sg
= qc
->__sg
;
3674 struct ata_port
*ap
= qc
->ap
;
3676 unsigned int offset
;
3679 if (qc
->cursect
== (qc
->nsect
- 1))
3680 ap
->hsm_task_state
= HSM_ST_LAST
;
3682 page
= sg
[qc
->cursg
].page
;
3683 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3685 /* get the current page and offset */
3686 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3687 offset
%= PAGE_SIZE
;
3689 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3691 if (PageHighMem(page
)) {
3692 unsigned long flags
;
3694 /* FIXME: use a bounce buffer */
3695 local_irq_save(flags
);
3696 buf
= kmap_atomic(page
, KM_IRQ0
);
3698 /* do the actual data transfer */
3699 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3701 kunmap_atomic(buf
, KM_IRQ0
);
3702 local_irq_restore(flags
);
3704 buf
= page_address(page
);
3705 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3711 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3718 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3719 * @qc: Command on going
3721 * Transfer one or many ATA_SECT_SIZE of data from/to the
3722 * ATA device for the DRQ request.
3725 * Inherited from caller.
3728 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3730 if (is_multi_taskfile(&qc
->tf
)) {
3731 /* READ/WRITE MULTIPLE */
3734 WARN_ON(qc
->dev
->multi_count
== 0);
3736 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3744 * atapi_send_cdb - Write CDB bytes to hardware
3745 * @ap: Port to which ATAPI device is attached.
3746 * @qc: Taskfile currently active
3748 * When device has indicated its readiness to accept
3749 * a CDB, this function is called. Send the CDB.
3755 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3758 DPRINTK("send cdb\n");
3759 WARN_ON(qc
->dev
->cdb_len
< 12);
3761 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3762 ata_altstatus(ap
); /* flush */
3764 switch (qc
->tf
.protocol
) {
3765 case ATA_PROT_ATAPI
:
3766 ap
->hsm_task_state
= HSM_ST
;
3768 case ATA_PROT_ATAPI_NODATA
:
3769 ap
->hsm_task_state
= HSM_ST_LAST
;
3771 case ATA_PROT_ATAPI_DMA
:
3772 ap
->hsm_task_state
= HSM_ST_LAST
;
3773 /* initiate bmdma */
3774 ap
->ops
->bmdma_start(qc
);
3780 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3781 * @qc: Command on going
3782 * @bytes: number of bytes
3784 * Transfer Transfer data from/to the ATAPI device.
3787 * Inherited from caller.
3791 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3793 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3794 struct scatterlist
*sg
= qc
->__sg
;
3795 struct ata_port
*ap
= qc
->ap
;
3798 unsigned int offset
, count
;
3800 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3801 ap
->hsm_task_state
= HSM_ST_LAST
;
3804 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3806 * The end of qc->sg is reached and the device expects
3807 * more data to transfer. In order not to overrun qc->sg
3808 * and fulfill length specified in the byte count register,
3809 * - for read case, discard trailing data from the device
3810 * - for write case, padding zero data to the device
3812 u16 pad_buf
[1] = { 0 };
3813 unsigned int words
= bytes
>> 1;
3816 if (words
) /* warning if bytes > 1 */
3817 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3818 "%u bytes trailing data\n", bytes
);
3820 for (i
= 0; i
< words
; i
++)
3821 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3823 ap
->hsm_task_state
= HSM_ST_LAST
;
3827 sg
= &qc
->__sg
[qc
->cursg
];
3830 offset
= sg
->offset
+ qc
->cursg_ofs
;
3832 /* get the current page and offset */
3833 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3834 offset
%= PAGE_SIZE
;
3836 /* don't overrun current sg */
3837 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3839 /* don't cross page boundaries */
3840 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3842 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3844 if (PageHighMem(page
)) {
3845 unsigned long flags
;
3847 /* FIXME: use bounce buffer */
3848 local_irq_save(flags
);
3849 buf
= kmap_atomic(page
, KM_IRQ0
);
3851 /* do the actual data transfer */
3852 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3854 kunmap_atomic(buf
, KM_IRQ0
);
3855 local_irq_restore(flags
);
3857 buf
= page_address(page
);
3858 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3862 qc
->curbytes
+= count
;
3863 qc
->cursg_ofs
+= count
;
3865 if (qc
->cursg_ofs
== sg
->length
) {
3875 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3876 * @qc: Command on going
3878 * Transfer Transfer data from/to the ATAPI device.
3881 * Inherited from caller.
3884 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3886 struct ata_port
*ap
= qc
->ap
;
3887 struct ata_device
*dev
= qc
->dev
;
3888 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3889 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3891 /* Abuse qc->result_tf for temp storage of intermediate TF
3892 * here to save some kernel stack usage.
3893 * For normal completion, qc->result_tf is not relevant. For
3894 * error, qc->result_tf is later overwritten by ata_qc_complete().
3895 * So, the correctness of qc->result_tf is not affected.
3897 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3898 ireason
= qc
->result_tf
.nsect
;
3899 bc_lo
= qc
->result_tf
.lbam
;
3900 bc_hi
= qc
->result_tf
.lbah
;
3901 bytes
= (bc_hi
<< 8) | bc_lo
;
3903 /* shall be cleared to zero, indicating xfer of data */
3904 if (ireason
& (1 << 0))
3907 /* make sure transfer direction matches expected */
3908 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3909 if (do_write
!= i_write
)
3912 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3914 __atapi_pio_bytes(qc
, bytes
);
3919 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3920 qc
->err_mask
|= AC_ERR_HSM
;
3921 ap
->hsm_task_state
= HSM_ST_ERR
;
3925 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3926 * @ap: the target ata_port
3930 * 1 if ok in workqueue, 0 otherwise.
3933 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3935 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3938 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3939 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3940 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3943 if (is_atapi_taskfile(&qc
->tf
) &&
3944 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3952 * ata_hsm_qc_complete - finish a qc running on standard HSM
3953 * @qc: Command to complete
3954 * @in_wq: 1 if called from workqueue, 0 otherwise
3956 * Finish @qc which is running on standard HSM.
3959 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3960 * Otherwise, none on entry and grabs host lock.
3962 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3964 struct ata_port
*ap
= qc
->ap
;
3965 unsigned long flags
;
3967 if (ap
->ops
->error_handler
) {
3969 spin_lock_irqsave(ap
->lock
, flags
);
3971 /* EH might have kicked in while host_set lock
3974 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3976 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3978 ata_qc_complete(qc
);
3980 ata_port_freeze(ap
);
3983 spin_unlock_irqrestore(ap
->lock
, flags
);
3985 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3986 ata_qc_complete(qc
);
3988 ata_port_freeze(ap
);
3992 spin_lock_irqsave(ap
->lock
, flags
);
3994 ata_qc_complete(qc
);
3995 spin_unlock_irqrestore(ap
->lock
, flags
);
3997 ata_qc_complete(qc
);
4000 ata_altstatus(ap
); /* flush */
4004 * ata_hsm_move - move the HSM to the next state.
4005 * @ap: the target ata_port
4007 * @status: current device status
4008 * @in_wq: 1 if called from workqueue, 0 otherwise
4011 * 1 when poll next status needed, 0 otherwise.
4013 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4014 u8 status
, int in_wq
)
4016 unsigned long flags
= 0;
4019 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4021 /* Make sure ata_qc_issue_prot() does not throw things
4022 * like DMA polling into the workqueue. Notice that
4023 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4025 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4028 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4029 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4031 switch (ap
->hsm_task_state
) {
4033 /* Send first data block or PACKET CDB */
4035 /* If polling, we will stay in the work queue after
4036 * sending the data. Otherwise, interrupt handler
4037 * takes over after sending the data.
4039 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4041 /* check device status */
4042 if (unlikely((status
& ATA_DRQ
) == 0)) {
4043 /* handle BSY=0, DRQ=0 as error */
4044 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4045 /* device stops HSM for abort/error */
4046 qc
->err_mask
|= AC_ERR_DEV
;
4048 /* HSM violation. Let EH handle this */
4049 qc
->err_mask
|= AC_ERR_HSM
;
4051 ap
->hsm_task_state
= HSM_ST_ERR
;
4055 /* Device should not ask for data transfer (DRQ=1)
4056 * when it finds something wrong.
4057 * We ignore DRQ here and stop the HSM by
4058 * changing hsm_task_state to HSM_ST_ERR and
4059 * let the EH abort the command or reset the device.
4061 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4062 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4064 qc
->err_mask
|= AC_ERR_HSM
;
4065 ap
->hsm_task_state
= HSM_ST_ERR
;
4069 /* Send the CDB (atapi) or the first data block (ata pio out).
4070 * During the state transition, interrupt handler shouldn't
4071 * be invoked before the data transfer is complete and
4072 * hsm_task_state is changed. Hence, the following locking.
4075 spin_lock_irqsave(ap
->lock
, flags
);
4077 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4078 /* PIO data out protocol.
4079 * send first data block.
4082 /* ata_pio_sectors() might change the state
4083 * to HSM_ST_LAST. so, the state is changed here
4084 * before ata_pio_sectors().
4086 ap
->hsm_task_state
= HSM_ST
;
4087 ata_pio_sectors(qc
);
4088 ata_altstatus(ap
); /* flush */
4091 atapi_send_cdb(ap
, qc
);
4094 spin_unlock_irqrestore(ap
->lock
, flags
);
4096 /* if polling, ata_pio_task() handles the rest.
4097 * otherwise, interrupt handler takes over from here.
4102 /* complete command or read/write the data register */
4103 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4104 /* ATAPI PIO protocol */
4105 if ((status
& ATA_DRQ
) == 0) {
4106 /* No more data to transfer or device error.
4107 * Device error will be tagged in HSM_ST_LAST.
4109 ap
->hsm_task_state
= HSM_ST_LAST
;
4113 /* Device should not ask for data transfer (DRQ=1)
4114 * when it finds something wrong.
4115 * We ignore DRQ here and stop the HSM by
4116 * changing hsm_task_state to HSM_ST_ERR and
4117 * let the EH abort the command or reset the device.
4119 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4120 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4122 qc
->err_mask
|= AC_ERR_HSM
;
4123 ap
->hsm_task_state
= HSM_ST_ERR
;
4127 atapi_pio_bytes(qc
);
4129 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4130 /* bad ireason reported by device */
4134 /* ATA PIO protocol */
4135 if (unlikely((status
& ATA_DRQ
) == 0)) {
4136 /* handle BSY=0, DRQ=0 as error */
4137 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4138 /* device stops HSM for abort/error */
4139 qc
->err_mask
|= AC_ERR_DEV
;
4141 /* HSM violation. Let EH handle this */
4142 qc
->err_mask
|= AC_ERR_HSM
;
4144 ap
->hsm_task_state
= HSM_ST_ERR
;
4148 /* For PIO reads, some devices may ask for
4149 * data transfer (DRQ=1) alone with ERR=1.
4150 * We respect DRQ here and transfer one
4151 * block of junk data before changing the
4152 * hsm_task_state to HSM_ST_ERR.
4154 * For PIO writes, ERR=1 DRQ=1 doesn't make
4155 * sense since the data block has been
4156 * transferred to the device.
4158 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4159 /* data might be corrputed */
4160 qc
->err_mask
|= AC_ERR_DEV
;
4162 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4163 ata_pio_sectors(qc
);
4165 status
= ata_wait_idle(ap
);
4168 if (status
& (ATA_BUSY
| ATA_DRQ
))
4169 qc
->err_mask
|= AC_ERR_HSM
;
4171 /* ata_pio_sectors() might change the
4172 * state to HSM_ST_LAST. so, the state
4173 * is changed after ata_pio_sectors().
4175 ap
->hsm_task_state
= HSM_ST_ERR
;
4179 ata_pio_sectors(qc
);
4181 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4182 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4185 status
= ata_wait_idle(ap
);
4190 ata_altstatus(ap
); /* flush */
4195 if (unlikely(!ata_ok(status
))) {
4196 qc
->err_mask
|= __ac_err_mask(status
);
4197 ap
->hsm_task_state
= HSM_ST_ERR
;
4201 /* no more data to transfer */
4202 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4203 ap
->id
, qc
->dev
->devno
, status
);
4205 WARN_ON(qc
->err_mask
);
4207 ap
->hsm_task_state
= HSM_ST_IDLE
;
4209 /* complete taskfile transaction */
4210 ata_hsm_qc_complete(qc
, in_wq
);
4216 /* make sure qc->err_mask is available to
4217 * know what's wrong and recover
4219 WARN_ON(qc
->err_mask
== 0);
4221 ap
->hsm_task_state
= HSM_ST_IDLE
;
4223 /* complete taskfile transaction */
4224 ata_hsm_qc_complete(qc
, in_wq
);
4236 static void ata_pio_task(void *_data
)
4238 struct ata_queued_cmd
*qc
= _data
;
4239 struct ata_port
*ap
= qc
->ap
;
4244 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4247 * This is purely heuristic. This is a fast path.
4248 * Sometimes when we enter, BSY will be cleared in
4249 * a chk-status or two. If not, the drive is probably seeking
4250 * or something. Snooze for a couple msecs, then
4251 * chk-status again. If still busy, queue delayed work.
4253 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4254 if (status
& ATA_BUSY
) {
4256 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4257 if (status
& ATA_BUSY
) {
4258 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4264 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4266 /* another command or interrupt handler
4267 * may be running at this point.
4274 * ata_qc_new - Request an available ATA command, for queueing
4275 * @ap: Port associated with device @dev
4276 * @dev: Device from whom we request an available command structure
4282 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4284 struct ata_queued_cmd
*qc
= NULL
;
4287 /* no command while frozen */
4288 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4291 /* the last tag is reserved for internal command. */
4292 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4293 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4294 qc
= __ata_qc_from_tag(ap
, i
);
4305 * ata_qc_new_init - Request an available ATA command, and initialize it
4306 * @dev: Device from whom we request an available command structure
4312 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4314 struct ata_port
*ap
= dev
->ap
;
4315 struct ata_queued_cmd
*qc
;
4317 qc
= ata_qc_new(ap
);
4330 * ata_qc_free - free unused ata_queued_cmd
4331 * @qc: Command to complete
4333 * Designed to free unused ata_queued_cmd object
4334 * in case something prevents using it.
4337 * spin_lock_irqsave(host_set lock)
4339 void ata_qc_free(struct ata_queued_cmd
*qc
)
4341 struct ata_port
*ap
= qc
->ap
;
4344 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4348 if (likely(ata_tag_valid(tag
))) {
4349 qc
->tag
= ATA_TAG_POISON
;
4350 clear_bit(tag
, &ap
->qc_allocated
);
4354 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4356 struct ata_port
*ap
= qc
->ap
;
4358 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4359 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4361 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4364 /* command should be marked inactive atomically with qc completion */
4365 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4366 ap
->sactive
&= ~(1 << qc
->tag
);
4368 ap
->active_tag
= ATA_TAG_POISON
;
4370 /* atapi: mark qc as inactive to prevent the interrupt handler
4371 * from completing the command twice later, before the error handler
4372 * is called. (when rc != 0 and atapi request sense is needed)
4374 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4375 ap
->qc_active
&= ~(1 << qc
->tag
);
4377 /* call completion callback */
4378 qc
->complete_fn(qc
);
4382 * ata_qc_complete - Complete an active ATA command
4383 * @qc: Command to complete
4384 * @err_mask: ATA Status register contents
4386 * Indicate to the mid and upper layers that an ATA
4387 * command has completed, with either an ok or not-ok status.
4390 * spin_lock_irqsave(host_set lock)
4392 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4394 struct ata_port
*ap
= qc
->ap
;
4396 /* XXX: New EH and old EH use different mechanisms to
4397 * synchronize EH with regular execution path.
4399 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4400 * Normal execution path is responsible for not accessing a
4401 * failed qc. libata core enforces the rule by returning NULL
4402 * from ata_qc_from_tag() for failed qcs.
4404 * Old EH depends on ata_qc_complete() nullifying completion
4405 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4406 * not synchronize with interrupt handler. Only PIO task is
4409 if (ap
->ops
->error_handler
) {
4410 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4412 if (unlikely(qc
->err_mask
))
4413 qc
->flags
|= ATA_QCFLAG_FAILED
;
4415 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4416 if (!ata_tag_internal(qc
->tag
)) {
4417 /* always fill result TF for failed qc */
4418 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4419 ata_qc_schedule_eh(qc
);
4424 /* read result TF if requested */
4425 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4426 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4428 __ata_qc_complete(qc
);
4430 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4433 /* read result TF if failed or requested */
4434 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4435 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4437 __ata_qc_complete(qc
);
4442 * ata_qc_complete_multiple - Complete multiple qcs successfully
4443 * @ap: port in question
4444 * @qc_active: new qc_active mask
4445 * @finish_qc: LLDD callback invoked before completing a qc
4447 * Complete in-flight commands. This functions is meant to be
4448 * called from low-level driver's interrupt routine to complete
4449 * requests normally. ap->qc_active and @qc_active is compared
4450 * and commands are completed accordingly.
4453 * spin_lock_irqsave(host_set lock)
4456 * Number of completed commands on success, -errno otherwise.
4458 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4459 void (*finish_qc
)(struct ata_queued_cmd
*))
4465 done_mask
= ap
->qc_active
^ qc_active
;
4467 if (unlikely(done_mask
& qc_active
)) {
4468 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4469 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4473 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4474 struct ata_queued_cmd
*qc
;
4476 if (!(done_mask
& (1 << i
)))
4479 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4482 ata_qc_complete(qc
);
4490 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4492 struct ata_port
*ap
= qc
->ap
;
4494 switch (qc
->tf
.protocol
) {
4497 case ATA_PROT_ATAPI_DMA
:
4500 case ATA_PROT_ATAPI
:
4502 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4515 * ata_qc_issue - issue taskfile to device
4516 * @qc: command to issue to device
4518 * Prepare an ATA command to submission to device.
4519 * This includes mapping the data into a DMA-able
4520 * area, filling in the S/G table, and finally
4521 * writing the taskfile to hardware, starting the command.
4524 * spin_lock_irqsave(host_set lock)
4526 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4528 struct ata_port
*ap
= qc
->ap
;
4530 /* Make sure only one non-NCQ command is outstanding. The
4531 * check is skipped for old EH because it reuses active qc to
4532 * request ATAPI sense.
4534 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4536 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4537 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4538 ap
->sactive
|= 1 << qc
->tag
;
4540 WARN_ON(ap
->sactive
);
4541 ap
->active_tag
= qc
->tag
;
4544 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4545 ap
->qc_active
|= 1 << qc
->tag
;
4547 if (ata_should_dma_map(qc
)) {
4548 if (qc
->flags
& ATA_QCFLAG_SG
) {
4549 if (ata_sg_setup(qc
))
4551 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4552 if (ata_sg_setup_one(qc
))
4556 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4559 ap
->ops
->qc_prep(qc
);
4561 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4562 if (unlikely(qc
->err_mask
))
4567 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4568 qc
->err_mask
|= AC_ERR_SYSTEM
;
4570 ata_qc_complete(qc
);
4574 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4575 * @qc: command to issue to device
4577 * Using various libata functions and hooks, this function
4578 * starts an ATA command. ATA commands are grouped into
4579 * classes called "protocols", and issuing each type of protocol
4580 * is slightly different.
4582 * May be used as the qc_issue() entry in ata_port_operations.
4585 * spin_lock_irqsave(host_set lock)
4588 * Zero on success, AC_ERR_* mask on failure
4591 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4593 struct ata_port
*ap
= qc
->ap
;
4595 /* Use polling pio if the LLD doesn't handle
4596 * interrupt driven pio and atapi CDB interrupt.
4598 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4599 switch (qc
->tf
.protocol
) {
4601 case ATA_PROT_ATAPI
:
4602 case ATA_PROT_ATAPI_NODATA
:
4603 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4605 case ATA_PROT_ATAPI_DMA
:
4606 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4607 /* see ata_dma_blacklisted() */
4615 /* select the device */
4616 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4618 /* start the command */
4619 switch (qc
->tf
.protocol
) {
4620 case ATA_PROT_NODATA
:
4621 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4622 ata_qc_set_polling(qc
);
4624 ata_tf_to_host(ap
, &qc
->tf
);
4625 ap
->hsm_task_state
= HSM_ST_LAST
;
4627 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4628 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4633 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4635 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4636 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4637 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4638 ap
->hsm_task_state
= HSM_ST_LAST
;
4642 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4643 ata_qc_set_polling(qc
);
4645 ata_tf_to_host(ap
, &qc
->tf
);
4647 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4648 /* PIO data out protocol */
4649 ap
->hsm_task_state
= HSM_ST_FIRST
;
4650 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4652 /* always send first data block using
4653 * the ata_pio_task() codepath.
4656 /* PIO data in protocol */
4657 ap
->hsm_task_state
= HSM_ST
;
4659 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4660 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4662 /* if polling, ata_pio_task() handles the rest.
4663 * otherwise, interrupt handler takes over from here.
4669 case ATA_PROT_ATAPI
:
4670 case ATA_PROT_ATAPI_NODATA
:
4671 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4672 ata_qc_set_polling(qc
);
4674 ata_tf_to_host(ap
, &qc
->tf
);
4676 ap
->hsm_task_state
= HSM_ST_FIRST
;
4678 /* send cdb by polling if no cdb interrupt */
4679 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4680 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4681 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4684 case ATA_PROT_ATAPI_DMA
:
4685 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4687 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4688 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4689 ap
->hsm_task_state
= HSM_ST_FIRST
;
4691 /* send cdb by polling if no cdb interrupt */
4692 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4693 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4698 return AC_ERR_SYSTEM
;
4705 * ata_host_intr - Handle host interrupt for given (port, task)
4706 * @ap: Port on which interrupt arrived (possibly...)
4707 * @qc: Taskfile currently active in engine
4709 * Handle host interrupt for given queued command. Currently,
4710 * only DMA interrupts are handled. All other commands are
4711 * handled via polling with interrupts disabled (nIEN bit).
4714 * spin_lock_irqsave(host_set lock)
4717 * One if interrupt was handled, zero if not (shared irq).
4720 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4721 struct ata_queued_cmd
*qc
)
4723 u8 status
, host_stat
= 0;
4725 VPRINTK("ata%u: protocol %d task_state %d\n",
4726 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4728 /* Check whether we are expecting interrupt in this state */
4729 switch (ap
->hsm_task_state
) {
4731 /* Some pre-ATAPI-4 devices assert INTRQ
4732 * at this state when ready to receive CDB.
4735 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4736 * The flag was turned on only for atapi devices.
4737 * No need to check is_atapi_taskfile(&qc->tf) again.
4739 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4743 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4744 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4745 /* check status of DMA engine */
4746 host_stat
= ap
->ops
->bmdma_status(ap
);
4747 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4749 /* if it's not our irq... */
4750 if (!(host_stat
& ATA_DMA_INTR
))
4753 /* before we do anything else, clear DMA-Start bit */
4754 ap
->ops
->bmdma_stop(qc
);
4756 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4757 /* error when transfering data to/from memory */
4758 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4759 ap
->hsm_task_state
= HSM_ST_ERR
;
4769 /* check altstatus */
4770 status
= ata_altstatus(ap
);
4771 if (status
& ATA_BUSY
)
4774 /* check main status, clearing INTRQ */
4775 status
= ata_chk_status(ap
);
4776 if (unlikely(status
& ATA_BUSY
))
4779 /* ack bmdma irq events */
4780 ap
->ops
->irq_clear(ap
);
4782 ata_hsm_move(ap
, qc
, status
, 0);
4783 return 1; /* irq handled */
4786 ap
->stats
.idle_irq
++;
4789 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4790 ata_irq_ack(ap
, 0); /* debug trap */
4791 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4795 return 0; /* irq not handled */
4799 * ata_interrupt - Default ATA host interrupt handler
4800 * @irq: irq line (unused)
4801 * @dev_instance: pointer to our ata_host_set information structure
4804 * Default interrupt handler for PCI IDE devices. Calls
4805 * ata_host_intr() for each port that is not disabled.
4808 * Obtains host_set lock during operation.
4811 * IRQ_NONE or IRQ_HANDLED.
4814 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4816 struct ata_host_set
*host_set
= dev_instance
;
4818 unsigned int handled
= 0;
4819 unsigned long flags
;
4821 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4822 spin_lock_irqsave(&host_set
->lock
, flags
);
4824 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4825 struct ata_port
*ap
;
4827 ap
= host_set
->ports
[i
];
4829 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4830 struct ata_queued_cmd
*qc
;
4832 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4833 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4834 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4835 handled
|= ata_host_intr(ap
, qc
);
4839 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4841 return IRQ_RETVAL(handled
);
4845 * sata_scr_valid - test whether SCRs are accessible
4846 * @ap: ATA port to test SCR accessibility for
4848 * Test whether SCRs are accessible for @ap.
4854 * 1 if SCRs are accessible, 0 otherwise.
4856 int sata_scr_valid(struct ata_port
*ap
)
4858 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4862 * sata_scr_read - read SCR register of the specified port
4863 * @ap: ATA port to read SCR for
4865 * @val: Place to store read value
4867 * Read SCR register @reg of @ap into *@val. This function is
4868 * guaranteed to succeed if the cable type of the port is SATA
4869 * and the port implements ->scr_read.
4875 * 0 on success, negative errno on failure.
4877 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4879 if (sata_scr_valid(ap
)) {
4880 *val
= ap
->ops
->scr_read(ap
, reg
);
4887 * sata_scr_write - write SCR register of the specified port
4888 * @ap: ATA port to write SCR for
4889 * @reg: SCR to write
4890 * @val: value to write
4892 * Write @val to SCR register @reg of @ap. This function is
4893 * guaranteed to succeed if the cable type of the port is SATA
4894 * and the port implements ->scr_read.
4900 * 0 on success, negative errno on failure.
4902 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4904 if (sata_scr_valid(ap
)) {
4905 ap
->ops
->scr_write(ap
, reg
, val
);
4912 * sata_scr_write_flush - write SCR register of the specified port and flush
4913 * @ap: ATA port to write SCR for
4914 * @reg: SCR to write
4915 * @val: value to write
4917 * This function is identical to sata_scr_write() except that this
4918 * function performs flush after writing to the register.
4924 * 0 on success, negative errno on failure.
4926 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4928 if (sata_scr_valid(ap
)) {
4929 ap
->ops
->scr_write(ap
, reg
, val
);
4930 ap
->ops
->scr_read(ap
, reg
);
4937 * ata_port_online - test whether the given port is online
4938 * @ap: ATA port to test
4940 * Test whether @ap is online. Note that this function returns 0
4941 * if online status of @ap cannot be obtained, so
4942 * ata_port_online(ap) != !ata_port_offline(ap).
4948 * 1 if the port online status is available and online.
4950 int ata_port_online(struct ata_port
*ap
)
4954 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4960 * ata_port_offline - test whether the given port is offline
4961 * @ap: ATA port to test
4963 * Test whether @ap is offline. Note that this function returns
4964 * 0 if offline status of @ap cannot be obtained, so
4965 * ata_port_online(ap) != !ata_port_offline(ap).
4971 * 1 if the port offline status is available and offline.
4973 int ata_port_offline(struct ata_port
*ap
)
4977 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4982 int ata_flush_cache(struct ata_device
*dev
)
4984 unsigned int err_mask
;
4987 if (!ata_try_flush_cache(dev
))
4990 if (ata_id_has_flush_ext(dev
->id
))
4991 cmd
= ATA_CMD_FLUSH_EXT
;
4993 cmd
= ATA_CMD_FLUSH
;
4995 err_mask
= ata_do_simple_cmd(dev
, cmd
);
4997 ata_dev_printk(dev
, KERN_ERR
, "failed to flush cache\n");
5004 static int ata_standby_drive(struct ata_device
*dev
)
5006 unsigned int err_mask
;
5008 err_mask
= ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
5010 ata_dev_printk(dev
, KERN_ERR
, "failed to standby drive "
5011 "(err_mask=0x%x)\n", err_mask
);
5018 static int ata_start_drive(struct ata_device
*dev
)
5020 unsigned int err_mask
;
5022 err_mask
= ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
5024 ata_dev_printk(dev
, KERN_ERR
, "failed to start drive "
5025 "(err_mask=0x%x)\n", err_mask
);
5033 * ata_device_resume - wakeup a previously suspended devices
5034 * @dev: the device to resume
5036 * Kick the drive back into action, by sending it an idle immediate
5037 * command and making sure its transfer mode matches between drive
5041 int ata_device_resume(struct ata_device
*dev
)
5043 struct ata_port
*ap
= dev
->ap
;
5045 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
5046 struct ata_device
*failed_dev
;
5048 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
5049 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
5051 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
5052 while (ata_set_mode(ap
, &failed_dev
))
5053 ata_dev_disable(failed_dev
);
5055 if (!ata_dev_enabled(dev
))
5057 if (dev
->class == ATA_DEV_ATA
)
5058 ata_start_drive(dev
);
5064 * ata_device_suspend - prepare a device for suspend
5065 * @dev: the device to suspend
5066 * @state: target power management state
5068 * Flush the cache on the drive, if appropriate, then issue a
5069 * standbynow command.
5071 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5073 struct ata_port
*ap
= dev
->ap
;
5075 if (!ata_dev_enabled(dev
))
5077 if (dev
->class == ATA_DEV_ATA
)
5078 ata_flush_cache(dev
);
5080 if (state
.event
!= PM_EVENT_FREEZE
)
5081 ata_standby_drive(dev
);
5082 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5087 * ata_port_start - Set port up for dma.
5088 * @ap: Port to initialize
5090 * Called just after data structures for each port are
5091 * initialized. Allocates space for PRD table.
5093 * May be used as the port_start() entry in ata_port_operations.
5096 * Inherited from caller.
5099 int ata_port_start (struct ata_port
*ap
)
5101 struct device
*dev
= ap
->dev
;
5104 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5108 rc
= ata_pad_alloc(ap
, dev
);
5110 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5114 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5121 * ata_port_stop - Undo ata_port_start()
5122 * @ap: Port to shut down
5124 * Frees the PRD table.
5126 * May be used as the port_stop() entry in ata_port_operations.
5129 * Inherited from caller.
5132 void ata_port_stop (struct ata_port
*ap
)
5134 struct device
*dev
= ap
->dev
;
5136 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5137 ata_pad_free(ap
, dev
);
5140 void ata_host_stop (struct ata_host_set
*host_set
)
5142 if (host_set
->mmio_base
)
5143 iounmap(host_set
->mmio_base
);
5148 * ata_host_remove - Unregister SCSI host structure with upper layers
5149 * @ap: Port to unregister
5150 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5153 * Inherited from caller.
5156 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5158 struct Scsi_Host
*sh
= ap
->host
;
5163 scsi_remove_host(sh
);
5165 ap
->ops
->port_stop(ap
);
5169 * ata_dev_init - Initialize an ata_device structure
5170 * @dev: Device structure to initialize
5172 * Initialize @dev in preparation for probing.
5175 * Inherited from caller.
5177 void ata_dev_init(struct ata_device
*dev
)
5179 struct ata_port
*ap
= dev
->ap
;
5180 unsigned long flags
;
5182 /* SATA spd limit is bound to the first device */
5183 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5185 /* High bits of dev->flags are used to record warm plug
5186 * requests which occur asynchronously. Synchronize using
5189 spin_lock_irqsave(ap
->lock
, flags
);
5190 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5191 spin_unlock_irqrestore(ap
->lock
, flags
);
5193 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5194 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5195 dev
->pio_mask
= UINT_MAX
;
5196 dev
->mwdma_mask
= UINT_MAX
;
5197 dev
->udma_mask
= UINT_MAX
;
5201 * ata_host_init - Initialize an ata_port structure
5202 * @ap: Structure to initialize
5203 * @host: associated SCSI mid-layer structure
5204 * @host_set: Collection of hosts to which @ap belongs
5205 * @ent: Probe information provided by low-level driver
5206 * @port_no: Port number associated with this ata_port
5208 * Initialize a new ata_port structure, and its associated
5212 * Inherited from caller.
5214 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5215 struct ata_host_set
*host_set
,
5216 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5222 host
->max_channel
= 1;
5223 host
->unique_id
= ata_unique_id
++;
5224 host
->max_cmd_len
= 12;
5226 ap
->lock
= &host_set
->lock
;
5227 ap
->flags
= ATA_FLAG_DISABLED
;
5228 ap
->id
= host
->unique_id
;
5230 ap
->ctl
= ATA_DEVCTL_OBS
;
5231 ap
->host_set
= host_set
;
5233 ap
->port_no
= port_no
;
5235 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5236 ap
->pio_mask
= ent
->pio_mask
;
5237 ap
->mwdma_mask
= ent
->mwdma_mask
;
5238 ap
->udma_mask
= ent
->udma_mask
;
5239 ap
->flags
|= ent
->host_flags
;
5240 ap
->ops
= ent
->port_ops
;
5241 ap
->hw_sata_spd_limit
= UINT_MAX
;
5242 ap
->active_tag
= ATA_TAG_POISON
;
5243 ap
->last_ctl
= 0xFF;
5245 #if defined(ATA_VERBOSE_DEBUG)
5246 /* turn on all debugging levels */
5247 ap
->msg_enable
= 0x00FF;
5248 #elif defined(ATA_DEBUG)
5249 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5251 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5254 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5255 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5256 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5257 INIT_LIST_HEAD(&ap
->eh_done_q
);
5258 init_waitqueue_head(&ap
->eh_wait_q
);
5260 /* set cable type */
5261 ap
->cbl
= ATA_CBL_NONE
;
5262 if (ap
->flags
& ATA_FLAG_SATA
)
5263 ap
->cbl
= ATA_CBL_SATA
;
5265 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5266 struct ata_device
*dev
= &ap
->device
[i
];
5273 ap
->stats
.unhandled_irq
= 1;
5274 ap
->stats
.idle_irq
= 1;
5277 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5281 * ata_host_add - Attach low-level ATA driver to system
5282 * @ent: Information provided by low-level driver
5283 * @host_set: Collections of ports to which we add
5284 * @port_no: Port number associated with this host
5286 * Attach low-level ATA driver to system.
5289 * PCI/etc. bus probe sem.
5292 * New ata_port on success, for NULL on error.
5295 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5296 struct ata_host_set
*host_set
,
5297 unsigned int port_no
)
5299 struct Scsi_Host
*host
;
5300 struct ata_port
*ap
;
5305 if (!ent
->port_ops
->error_handler
&&
5306 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5307 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5312 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5316 host
->transportt
= &ata_scsi_transport_template
;
5318 ap
= ata_shost_to_port(host
);
5320 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5322 rc
= ap
->ops
->port_start(ap
);
5329 scsi_host_put(host
);
5334 * ata_device_add - Register hardware device with ATA and SCSI layers
5335 * @ent: Probe information describing hardware device to be registered
5337 * This function processes the information provided in the probe
5338 * information struct @ent, allocates the necessary ATA and SCSI
5339 * host information structures, initializes them, and registers
5340 * everything with requisite kernel subsystems.
5342 * This function requests irqs, probes the ATA bus, and probes
5346 * PCI/etc. bus probe sem.
5349 * Number of ports registered. Zero on error (no ports registered).
5351 int ata_device_add(const struct ata_probe_ent
*ent
)
5353 unsigned int count
= 0, i
;
5354 struct device
*dev
= ent
->dev
;
5355 struct ata_host_set
*host_set
;
5359 /* alloc a container for our list of ATA ports (buses) */
5360 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5361 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5364 spin_lock_init(&host_set
->lock
);
5366 host_set
->dev
= dev
;
5367 host_set
->n_ports
= ent
->n_ports
;
5368 host_set
->irq
= ent
->irq
;
5369 host_set
->mmio_base
= ent
->mmio_base
;
5370 host_set
->private_data
= ent
->private_data
;
5371 host_set
->ops
= ent
->port_ops
;
5372 host_set
->flags
= ent
->host_set_flags
;
5374 /* register each port bound to this device */
5375 for (i
= 0; i
< ent
->n_ports
; i
++) {
5376 struct ata_port
*ap
;
5377 unsigned long xfer_mode_mask
;
5379 ap
= ata_host_add(ent
, host_set
, i
);
5383 host_set
->ports
[i
] = ap
;
5384 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5385 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5386 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5388 /* print per-port info to dmesg */
5389 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5390 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5391 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5392 ata_mode_string(xfer_mode_mask
),
5393 ap
->ioaddr
.cmd_addr
,
5394 ap
->ioaddr
.ctl_addr
,
5395 ap
->ioaddr
.bmdma_addr
,
5399 host_set
->ops
->irq_clear(ap
);
5400 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5407 /* obtain irq, that is shared between channels */
5408 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5409 DRV_NAME
, host_set
);
5411 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5416 /* perform each probe synchronously */
5417 DPRINTK("probe begin\n");
5418 for (i
= 0; i
< count
; i
++) {
5419 struct ata_port
*ap
;
5423 ap
= host_set
->ports
[i
];
5425 /* init sata_spd_limit to the current value */
5426 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5427 int spd
= (scontrol
>> 4) & 0xf;
5428 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5430 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5432 rc
= scsi_add_host(ap
->host
, dev
);
5434 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5435 /* FIXME: do something useful here */
5436 /* FIXME: handle unconditional calls to
5437 * scsi_scan_host and ata_host_remove, below,
5442 if (ap
->ops
->error_handler
) {
5443 unsigned long flags
;
5447 /* kick EH for boot probing */
5448 spin_lock_irqsave(ap
->lock
, flags
);
5450 ap
->eh_info
.probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5451 ap
->eh_info
.action
|= ATA_EH_SOFTRESET
;
5453 ap
->flags
|= ATA_FLAG_LOADING
;
5454 ata_port_schedule_eh(ap
);
5456 spin_unlock_irqrestore(ap
->lock
, flags
);
5458 /* wait for EH to finish */
5459 ata_port_wait_eh(ap
);
5461 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5462 rc
= ata_bus_probe(ap
);
5463 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5466 /* FIXME: do something useful here?
5467 * Current libata behavior will
5468 * tear down everything when
5469 * the module is removed
5470 * or the h/w is unplugged.
5476 /* probes are done, now scan each port's disk(s) */
5477 DPRINTK("host probe begin\n");
5478 for (i
= 0; i
< count
; i
++) {
5479 struct ata_port
*ap
= host_set
->ports
[i
];
5481 ata_scsi_scan_host(ap
);
5484 dev_set_drvdata(dev
, host_set
);
5486 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5487 return ent
->n_ports
; /* success */
5490 for (i
= 0; i
< count
; i
++) {
5491 ata_host_remove(host_set
->ports
[i
], 1);
5492 scsi_host_put(host_set
->ports
[i
]->host
);
5496 VPRINTK("EXIT, returning 0\n");
5501 * ata_port_detach - Detach ATA port in prepration of device removal
5502 * @ap: ATA port to be detached
5504 * Detach all ATA devices and the associated SCSI devices of @ap;
5505 * then, remove the associated SCSI host. @ap is guaranteed to
5506 * be quiescent on return from this function.
5509 * Kernel thread context (may sleep).
5511 void ata_port_detach(struct ata_port
*ap
)
5513 unsigned long flags
;
5516 if (!ap
->ops
->error_handler
)
5519 /* tell EH we're leaving & flush EH */
5520 spin_lock_irqsave(ap
->lock
, flags
);
5521 ap
->flags
|= ATA_FLAG_UNLOADING
;
5522 spin_unlock_irqrestore(ap
->lock
, flags
);
5524 ata_port_wait_eh(ap
);
5526 /* EH is now guaranteed to see UNLOADING, so no new device
5527 * will be attached. Disable all existing devices.
5529 spin_lock_irqsave(ap
->lock
, flags
);
5531 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5532 ata_dev_disable(&ap
->device
[i
]);
5534 spin_unlock_irqrestore(ap
->lock
, flags
);
5536 /* Final freeze & EH. All in-flight commands are aborted. EH
5537 * will be skipped and retrials will be terminated with bad
5540 spin_lock_irqsave(ap
->lock
, flags
);
5541 ata_port_freeze(ap
); /* won't be thawed */
5542 spin_unlock_irqrestore(ap
->lock
, flags
);
5544 ata_port_wait_eh(ap
);
5546 /* Flush hotplug task. The sequence is similar to
5547 * ata_port_flush_task().
5549 flush_workqueue(ata_aux_wq
);
5550 cancel_delayed_work(&ap
->hotplug_task
);
5551 flush_workqueue(ata_aux_wq
);
5553 /* remove the associated SCSI host */
5554 scsi_remove_host(ap
->host
);
5558 * ata_host_set_remove - PCI layer callback for device removal
5559 * @host_set: ATA host set that was removed
5561 * Unregister all objects associated with this host set. Free those
5565 * Inherited from calling layer (may sleep).
5568 void ata_host_set_remove(struct ata_host_set
*host_set
)
5572 for (i
= 0; i
< host_set
->n_ports
; i
++)
5573 ata_port_detach(host_set
->ports
[i
]);
5575 free_irq(host_set
->irq
, host_set
);
5577 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5578 struct ata_port
*ap
= host_set
->ports
[i
];
5580 ata_scsi_release(ap
->host
);
5582 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5583 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5585 if (ioaddr
->cmd_addr
== 0x1f0)
5586 release_region(0x1f0, 8);
5587 else if (ioaddr
->cmd_addr
== 0x170)
5588 release_region(0x170, 8);
5591 scsi_host_put(ap
->host
);
5594 if (host_set
->ops
->host_stop
)
5595 host_set
->ops
->host_stop(host_set
);
5601 * ata_scsi_release - SCSI layer callback hook for host unload
5602 * @host: libata host to be unloaded
5604 * Performs all duties necessary to shut down a libata port...
5605 * Kill port kthread, disable port, and release resources.
5608 * Inherited from SCSI layer.
5614 int ata_scsi_release(struct Scsi_Host
*host
)
5616 struct ata_port
*ap
= ata_shost_to_port(host
);
5620 ap
->ops
->port_disable(ap
);
5621 ata_host_remove(ap
, 0);
5628 * ata_std_ports - initialize ioaddr with standard port offsets.
5629 * @ioaddr: IO address structure to be initialized
5631 * Utility function which initializes data_addr, error_addr,
5632 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5633 * device_addr, status_addr, and command_addr to standard offsets
5634 * relative to cmd_addr.
5636 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5639 void ata_std_ports(struct ata_ioports
*ioaddr
)
5641 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5642 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5643 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5644 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5645 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5646 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5647 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5648 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5649 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5650 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5656 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5658 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5660 pci_iounmap(pdev
, host_set
->mmio_base
);
5664 * ata_pci_remove_one - PCI layer callback for device removal
5665 * @pdev: PCI device that was removed
5667 * PCI layer indicates to libata via this hook that
5668 * hot-unplug or module unload event has occurred.
5669 * Handle this by unregistering all objects associated
5670 * with this PCI device. Free those objects. Then finally
5671 * release PCI resources and disable device.
5674 * Inherited from PCI layer (may sleep).
5677 void ata_pci_remove_one (struct pci_dev
*pdev
)
5679 struct device
*dev
= pci_dev_to_dev(pdev
);
5680 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5681 struct ata_host_set
*host_set2
= host_set
->next
;
5683 ata_host_set_remove(host_set
);
5685 ata_host_set_remove(host_set2
);
5687 pci_release_regions(pdev
);
5688 pci_disable_device(pdev
);
5689 dev_set_drvdata(dev
, NULL
);
5692 /* move to PCI subsystem */
5693 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5695 unsigned long tmp
= 0;
5697 switch (bits
->width
) {
5700 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5706 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5712 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5723 return (tmp
== bits
->val
) ? 1 : 0;
5726 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5728 pci_save_state(pdev
);
5729 pci_disable_device(pdev
);
5730 pci_set_power_state(pdev
, PCI_D3hot
);
5734 int ata_pci_device_resume(struct pci_dev
*pdev
)
5736 pci_set_power_state(pdev
, PCI_D0
);
5737 pci_restore_state(pdev
);
5738 pci_enable_device(pdev
);
5739 pci_set_master(pdev
);
5742 #endif /* CONFIG_PCI */
5745 static int __init
ata_init(void)
5747 ata_probe_timeout
*= HZ
;
5748 ata_wq
= create_workqueue("ata");
5752 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5754 destroy_workqueue(ata_wq
);
5758 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5762 static void __exit
ata_exit(void)
5764 destroy_workqueue(ata_wq
);
5765 destroy_workqueue(ata_aux_wq
);
5768 module_init(ata_init
);
5769 module_exit(ata_exit
);
5771 static unsigned long ratelimit_time
;
5772 static DEFINE_SPINLOCK(ata_ratelimit_lock
);
5774 int ata_ratelimit(void)
5777 unsigned long flags
;
5779 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5781 if (time_after(jiffies
, ratelimit_time
)) {
5783 ratelimit_time
= jiffies
+ (HZ
/5);
5787 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5793 * ata_wait_register - wait until register value changes
5794 * @reg: IO-mapped register
5795 * @mask: Mask to apply to read register value
5796 * @val: Wait condition
5797 * @interval_msec: polling interval in milliseconds
5798 * @timeout_msec: timeout in milliseconds
5800 * Waiting for some bits of register to change is a common
5801 * operation for ATA controllers. This function reads 32bit LE
5802 * IO-mapped register @reg and tests for the following condition.
5804 * (*@reg & mask) != val
5806 * If the condition is met, it returns; otherwise, the process is
5807 * repeated after @interval_msec until timeout.
5810 * Kernel thread context (may sleep)
5813 * The final register value.
5815 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5816 unsigned long interval_msec
,
5817 unsigned long timeout_msec
)
5819 unsigned long timeout
;
5822 tmp
= ioread32(reg
);
5824 /* Calculate timeout _after_ the first read to make sure
5825 * preceding writes reach the controller before starting to
5826 * eat away the timeout.
5828 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5830 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5831 msleep(interval_msec
);
5832 tmp
= ioread32(reg
);
5839 * libata is essentially a library of internal helper functions for
5840 * low-level ATA host controller drivers. As such, the API/ABI is
5841 * likely to change as new drivers are added and updated.
5842 * Do not depend on ABI/API stability.
5845 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5846 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5847 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5848 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5849 EXPORT_SYMBOL_GPL(ata_std_ports
);
5850 EXPORT_SYMBOL_GPL(ata_device_add
);
5851 EXPORT_SYMBOL_GPL(ata_port_detach
);
5852 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5853 EXPORT_SYMBOL_GPL(ata_sg_init
);
5854 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5855 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5856 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5857 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5858 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5859 EXPORT_SYMBOL_GPL(ata_tf_load
);
5860 EXPORT_SYMBOL_GPL(ata_tf_read
);
5861 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5862 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5863 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5864 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5865 EXPORT_SYMBOL_GPL(ata_check_status
);
5866 EXPORT_SYMBOL_GPL(ata_altstatus
);
5867 EXPORT_SYMBOL_GPL(ata_exec_command
);
5868 EXPORT_SYMBOL_GPL(ata_port_start
);
5869 EXPORT_SYMBOL_GPL(ata_port_stop
);
5870 EXPORT_SYMBOL_GPL(ata_host_stop
);
5871 EXPORT_SYMBOL_GPL(ata_interrupt
);
5872 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5873 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5874 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5875 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5876 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5877 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5878 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5879 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5880 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5881 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5882 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5883 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5884 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5885 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5886 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5887 EXPORT_SYMBOL_GPL(ata_port_probe
);
5888 EXPORT_SYMBOL_GPL(sata_set_spd
);
5889 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5890 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5891 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5892 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5893 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5894 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5895 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5896 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5897 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5898 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5899 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5900 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5901 EXPORT_SYMBOL_GPL(ata_port_disable
);
5902 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5903 EXPORT_SYMBOL_GPL(ata_wait_register
);
5904 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5905 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5906 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5907 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5908 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5909 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5910 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5911 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5912 EXPORT_SYMBOL_GPL(ata_host_intr
);
5913 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5914 EXPORT_SYMBOL_GPL(sata_scr_read
);
5915 EXPORT_SYMBOL_GPL(sata_scr_write
);
5916 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5917 EXPORT_SYMBOL_GPL(ata_port_online
);
5918 EXPORT_SYMBOL_GPL(ata_port_offline
);
5919 EXPORT_SYMBOL_GPL(ata_id_string
);
5920 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5921 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5923 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5924 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5925 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5928 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5929 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5930 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5931 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5932 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5933 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5934 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5935 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5936 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5937 #endif /* CONFIG_PCI */
5939 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5940 EXPORT_SYMBOL_GPL(ata_device_resume
);
5941 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5942 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5944 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5945 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5946 EXPORT_SYMBOL_GPL(ata_port_abort
);
5947 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5948 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5949 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5950 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5951 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5952 EXPORT_SYMBOL_GPL(ata_do_eh
);