2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 /* debounce timing parameters in msecs { interval, duration, timeout } */
65 const unsigned long sata_deb_timing_boot
[] = { 5, 100, 2000 };
66 const unsigned long sata_deb_timing_eh
[] = { 25, 500, 2000 };
67 const unsigned long sata_deb_timing_before_fsrst
[] = { 100, 2000, 5000 };
69 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
70 u16 heads
, u16 sectors
);
71 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
72 static void ata_dev_xfermask(struct ata_device
*dev
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 struct workqueue_struct
*ata_aux_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param(atapi_dmadir
, int, 0444);
85 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
88 module_param_named(fua
, libata_fua
, int, 0444);
89 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
91 MODULE_AUTHOR("Jeff Garzik");
92 MODULE_DESCRIPTION("Library module for ATA devices");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(DRV_VERSION
);
98 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
99 * @tf: Taskfile to convert
100 * @fis: Buffer into which data will output
101 * @pmp: Port multiplier port
103 * Converts a standard ATA taskfile to a Serial ATA
104 * FIS structure (Register - Host to Device).
107 * Inherited from caller.
110 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
112 fis
[0] = 0x27; /* Register - Host to Device FIS */
113 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
114 bit 7 indicates Command FIS */
115 fis
[2] = tf
->command
;
116 fis
[3] = tf
->feature
;
123 fis
[8] = tf
->hob_lbal
;
124 fis
[9] = tf
->hob_lbam
;
125 fis
[10] = tf
->hob_lbah
;
126 fis
[11] = tf
->hob_feature
;
129 fis
[13] = tf
->hob_nsect
;
140 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
141 * @fis: Buffer from which data will be input
142 * @tf: Taskfile to output
144 * Converts a serial ATA FIS structure to a standard ATA taskfile.
147 * Inherited from caller.
150 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
152 tf
->command
= fis
[2]; /* status */
153 tf
->feature
= fis
[3]; /* error */
160 tf
->hob_lbal
= fis
[8];
161 tf
->hob_lbam
= fis
[9];
162 tf
->hob_lbah
= fis
[10];
165 tf
->hob_nsect
= fis
[13];
168 static const u8 ata_rw_cmds
[] = {
172 ATA_CMD_READ_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_EXT
,
177 ATA_CMD_WRITE_MULTI_FUA_EXT
,
181 ATA_CMD_PIO_READ_EXT
,
182 ATA_CMD_PIO_WRITE_EXT
,
195 ATA_CMD_WRITE_FUA_EXT
199 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
200 * @qc: command to examine and configure
202 * Examine the device configuration and tf->flags to calculate
203 * the proper read/write commands and protocol to use.
208 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
210 struct ata_taskfile
*tf
= &qc
->tf
;
211 struct ata_device
*dev
= qc
->dev
;
214 int index
, fua
, lba48
, write
;
216 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
217 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
218 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
220 if (dev
->flags
& ATA_DFLAG_PIO
) {
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
223 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
224 /* Unable to use DMA due to host limitation */
225 tf
->protocol
= ATA_PROT_PIO
;
226 index
= dev
->multi_count
? 0 : 8;
228 tf
->protocol
= ATA_PROT_DMA
;
232 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
241 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
242 * @pio_mask: pio_mask
243 * @mwdma_mask: mwdma_mask
244 * @udma_mask: udma_mask
246 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
247 * unsigned int xfer_mask.
255 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
256 unsigned int mwdma_mask
,
257 unsigned int udma_mask
)
259 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
260 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
261 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
265 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
266 * @xfer_mask: xfer_mask to unpack
267 * @pio_mask: resulting pio_mask
268 * @mwdma_mask: resulting mwdma_mask
269 * @udma_mask: resulting udma_mask
271 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
272 * Any NULL distination masks will be ignored.
274 static void ata_unpack_xfermask(unsigned int xfer_mask
,
275 unsigned int *pio_mask
,
276 unsigned int *mwdma_mask
,
277 unsigned int *udma_mask
)
280 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
282 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
284 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
287 static const struct ata_xfer_ent
{
291 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
292 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
293 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
298 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
299 * @xfer_mask: xfer_mask of interest
301 * Return matching XFER_* value for @xfer_mask. Only the highest
302 * bit of @xfer_mask is considered.
308 * Matching XFER_* value, 0 if no match found.
310 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
312 int highbit
= fls(xfer_mask
) - 1;
313 const struct ata_xfer_ent
*ent
;
315 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
316 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
317 return ent
->base
+ highbit
- ent
->shift
;
322 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
323 * @xfer_mode: XFER_* of interest
325 * Return matching xfer_mask for @xfer_mode.
331 * Matching xfer_mask, 0 if no match found.
333 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
335 const struct ata_xfer_ent
*ent
;
337 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
338 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
339 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
344 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
345 * @xfer_mode: XFER_* of interest
347 * Return matching xfer_shift for @xfer_mode.
353 * Matching xfer_shift, -1 if no match found.
355 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
357 const struct ata_xfer_ent
*ent
;
359 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
360 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
366 * ata_mode_string - convert xfer_mask to string
367 * @xfer_mask: mask of bits supported; only highest bit counts.
369 * Determine string which represents the highest speed
370 * (highest bit in @modemask).
376 * Constant C string representing highest speed listed in
377 * @mode_mask, or the constant C string "<n/a>".
379 static const char *ata_mode_string(unsigned int xfer_mask
)
381 static const char * const xfer_mode_str
[] = {
401 highbit
= fls(xfer_mask
) - 1;
402 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
403 return xfer_mode_str
[highbit
];
407 static const char *sata_spd_string(unsigned int spd
)
409 static const char * const spd_str
[] = {
414 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
416 return spd_str
[spd
- 1];
419 void ata_dev_disable(struct ata_device
*dev
)
421 if (ata_dev_enabled(dev
) && ata_msg_drv(dev
->ap
)) {
422 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
428 * ata_pio_devchk - PATA device presence detection
429 * @ap: ATA channel to examine
430 * @device: Device to examine (starting at zero)
432 * This technique was originally described in
433 * Hale Landis's ATADRVR (www.ata-atapi.com), and
434 * later found its way into the ATA/ATAPI spec.
436 * Write a pattern to the ATA shadow registers,
437 * and if a device is present, it will respond by
438 * correctly storing and echoing back the
439 * ATA shadow register contents.
445 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
448 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
451 ap
->ops
->dev_select(ap
, device
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 outb(0xaa, ioaddr
->nsect_addr
);
457 outb(0x55, ioaddr
->lbal_addr
);
459 outb(0x55, ioaddr
->nsect_addr
);
460 outb(0xaa, ioaddr
->lbal_addr
);
462 nsect
= inb(ioaddr
->nsect_addr
);
463 lbal
= inb(ioaddr
->lbal_addr
);
465 if ((nsect
== 0x55) && (lbal
== 0xaa))
466 return 1; /* we found a device */
468 return 0; /* nothing found */
472 * ata_mmio_devchk - PATA device presence detection
473 * @ap: ATA channel to examine
474 * @device: Device to examine (starting at zero)
476 * This technique was originally described in
477 * Hale Landis's ATADRVR (www.ata-atapi.com), and
478 * later found its way into the ATA/ATAPI spec.
480 * Write a pattern to the ATA shadow registers,
481 * and if a device is present, it will respond by
482 * correctly storing and echoing back the
483 * ATA shadow register contents.
489 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
492 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
495 ap
->ops
->dev_select(ap
, device
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
503 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
506 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
507 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
509 if ((nsect
== 0x55) && (lbal
== 0xaa))
510 return 1; /* we found a device */
512 return 0; /* nothing found */
516 * ata_devchk - PATA device presence detection
517 * @ap: ATA channel to examine
518 * @device: Device to examine (starting at zero)
520 * Dispatch ATA device presence detection, depending
521 * on whether we are using PIO or MMIO to talk to the
522 * ATA shadow registers.
528 static unsigned int ata_devchk(struct ata_port
*ap
,
531 if (ap
->flags
& ATA_FLAG_MMIO
)
532 return ata_mmio_devchk(ap
, device
);
533 return ata_pio_devchk(ap
, device
);
537 * ata_dev_classify - determine device type based on ATA-spec signature
538 * @tf: ATA taskfile register set for device to be identified
540 * Determine from taskfile register contents whether a device is
541 * ATA or ATAPI, as per "Signature and persistence" section
542 * of ATA/PI spec (volume 1, sect 5.14).
548 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
549 * the event of failure.
552 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
554 /* Apple's open source Darwin code hints that some devices only
555 * put a proper signature into the LBA mid/high registers,
556 * So, we only check those. It's sufficient for uniqueness.
559 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
560 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
561 DPRINTK("found ATA device by sig\n");
565 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
566 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
567 DPRINTK("found ATAPI device by sig\n");
568 return ATA_DEV_ATAPI
;
571 DPRINTK("unknown device\n");
572 return ATA_DEV_UNKNOWN
;
576 * ata_dev_try_classify - Parse returned ATA device signature
577 * @ap: ATA channel to examine
578 * @device: Device to examine (starting at zero)
579 * @r_err: Value of error register on completion
581 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
582 * an ATA/ATAPI-defined set of values is placed in the ATA
583 * shadow registers, indicating the results of device detection
586 * Select the ATA device, and read the values from the ATA shadow
587 * registers. Then parse according to the Error register value,
588 * and the spec-defined values examined by ata_dev_classify().
594 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
598 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
600 struct ata_taskfile tf
;
604 ap
->ops
->dev_select(ap
, device
);
606 memset(&tf
, 0, sizeof(tf
));
608 ap
->ops
->tf_read(ap
, &tf
);
613 /* see if device passed diags */
616 else if ((device
== 0) && (err
== 0x81))
621 /* determine if device is ATA or ATAPI */
622 class = ata_dev_classify(&tf
);
624 if (class == ATA_DEV_UNKNOWN
)
626 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
632 * ata_id_string - Convert IDENTIFY DEVICE page into string
633 * @id: IDENTIFY DEVICE results we will examine
634 * @s: string into which data is output
635 * @ofs: offset into identify device page
636 * @len: length of string to return. must be an even number.
638 * The strings in the IDENTIFY DEVICE page are broken up into
639 * 16-bit chunks. Run through the string, and output each
640 * 8-bit chunk linearly, regardless of platform.
646 void ata_id_string(const u16
*id
, unsigned char *s
,
647 unsigned int ofs
, unsigned int len
)
666 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
667 * @id: IDENTIFY DEVICE results we will examine
668 * @s: string into which data is output
669 * @ofs: offset into identify device page
670 * @len: length of string to return. must be an odd number.
672 * This function is identical to ata_id_string except that it
673 * trims trailing spaces and terminates the resulting string with
674 * null. @len must be actual maximum length (even number) + 1.
679 void ata_id_c_string(const u16
*id
, unsigned char *s
,
680 unsigned int ofs
, unsigned int len
)
686 ata_id_string(id
, s
, ofs
, len
- 1);
688 p
= s
+ strnlen(s
, len
- 1);
689 while (p
> s
&& p
[-1] == ' ')
694 static u64
ata_id_n_sectors(const u16
*id
)
696 if (ata_id_has_lba(id
)) {
697 if (ata_id_has_lba48(id
))
698 return ata_id_u64(id
, 100);
700 return ata_id_u32(id
, 60);
702 if (ata_id_current_chs_valid(id
))
703 return ata_id_u32(id
, 57);
705 return id
[1] * id
[3] * id
[6];
710 * ata_noop_dev_select - Select device 0/1 on ATA bus
711 * @ap: ATA channel to manipulate
712 * @device: ATA device (numbered from zero) to select
714 * This function performs no actual function.
716 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
727 * ata_std_dev_select - Select device 0/1 on ATA bus
728 * @ap: ATA channel to manipulate
729 * @device: ATA device (numbered from zero) to select
731 * Use the method defined in the ATA specification to
732 * make either device 0, or device 1, active on the
733 * ATA channel. Works with both PIO and MMIO.
735 * May be used as the dev_select() entry in ata_port_operations.
741 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
746 tmp
= ATA_DEVICE_OBS
;
748 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
750 if (ap
->flags
& ATA_FLAG_MMIO
) {
751 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
753 outb(tmp
, ap
->ioaddr
.device_addr
);
755 ata_pause(ap
); /* needed; also flushes, for mmio */
759 * ata_dev_select - Select device 0/1 on ATA bus
760 * @ap: ATA channel to manipulate
761 * @device: ATA device (numbered from zero) to select
762 * @wait: non-zero to wait for Status register BSY bit to clear
763 * @can_sleep: non-zero if context allows sleeping
765 * Use the method defined in the ATA specification to
766 * make either device 0, or device 1, active on the
769 * This is a high-level version of ata_std_dev_select(),
770 * which additionally provides the services of inserting
771 * the proper pauses and status polling, where needed.
777 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
778 unsigned int wait
, unsigned int can_sleep
)
780 if (ata_msg_probe(ap
)) {
781 ata_port_printk(ap
, KERN_INFO
, "ata_dev_select: ENTER, ata%u: "
782 "device %u, wait %u\n",
783 ap
->id
, device
, wait
);
789 ap
->ops
->dev_select(ap
, device
);
792 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
799 * ata_dump_id - IDENTIFY DEVICE info debugging output
800 * @id: IDENTIFY DEVICE page to dump
802 * Dump selected 16-bit words from the given IDENTIFY DEVICE
809 static inline void ata_dump_id(const u16
*id
)
811 DPRINTK("49==0x%04x "
821 DPRINTK("80==0x%04x "
831 DPRINTK("88==0x%04x "
838 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
839 * @id: IDENTIFY data to compute xfer mask from
841 * Compute the xfermask for this device. This is not as trivial
842 * as it seems if we must consider early devices correctly.
844 * FIXME: pre IDE drive timing (do we care ?).
852 static unsigned int ata_id_xfermask(const u16
*id
)
854 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
856 /* Usual case. Word 53 indicates word 64 is valid */
857 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
858 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
862 /* If word 64 isn't valid then Word 51 high byte holds
863 * the PIO timing number for the maximum. Turn it into
866 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
868 /* But wait.. there's more. Design your standards by
869 * committee and you too can get a free iordy field to
870 * process. However its the speeds not the modes that
871 * are supported... Note drivers using the timing API
872 * will get this right anyway
876 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
879 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
880 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
882 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
886 * ata_port_queue_task - Queue port_task
887 * @ap: The ata_port to queue port_task for
888 * @fn: workqueue function to be scheduled
889 * @data: data value to pass to workqueue function
890 * @delay: delay time for workqueue function
892 * Schedule @fn(@data) for execution after @delay jiffies using
893 * port_task. There is one port_task per port and it's the
894 * user(low level driver)'s responsibility to make sure that only
895 * one task is active at any given time.
897 * libata core layer takes care of synchronization between
898 * port_task and EH. ata_port_queue_task() may be ignored for EH
902 * Inherited from caller.
904 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
909 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
912 PREPARE_WORK(&ap
->port_task
, fn
, data
);
915 rc
= queue_work(ata_wq
, &ap
->port_task
);
917 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
919 /* rc == 0 means that another user is using port task */
924 * ata_port_flush_task - Flush port_task
925 * @ap: The ata_port to flush port_task for
927 * After this function completes, port_task is guranteed not to
928 * be running or scheduled.
931 * Kernel thread context (may sleep)
933 void ata_port_flush_task(struct ata_port
*ap
)
939 spin_lock_irqsave(ap
->lock
, flags
);
940 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
941 spin_unlock_irqrestore(ap
->lock
, flags
);
943 DPRINTK("flush #1\n");
944 flush_workqueue(ata_wq
);
947 * At this point, if a task is running, it's guaranteed to see
948 * the FLUSH flag; thus, it will never queue pio tasks again.
951 if (!cancel_delayed_work(&ap
->port_task
)) {
953 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n", __FUNCTION__
);
954 flush_workqueue(ata_wq
);
957 spin_lock_irqsave(ap
->lock
, flags
);
958 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
959 spin_unlock_irqrestore(ap
->lock
, flags
);
962 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
965 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
967 struct completion
*waiting
= qc
->private_data
;
973 * ata_exec_internal - execute libata internal command
974 * @dev: Device to which the command is sent
975 * @tf: Taskfile registers for the command and the result
976 * @cdb: CDB for packet command
977 * @dma_dir: Data tranfer direction of the command
978 * @buf: Data buffer of the command
979 * @buflen: Length of data buffer
981 * Executes libata internal command with timeout. @tf contains
982 * command on entry and result on return. Timeout and error
983 * conditions are reported via return value. No recovery action
984 * is taken after a command times out. It's caller's duty to
985 * clean up after timeout.
988 * None. Should be called with kernel context, might sleep.
991 * Zero on success, AC_ERR_* mask on failure
993 unsigned ata_exec_internal(struct ata_device
*dev
,
994 struct ata_taskfile
*tf
, const u8
*cdb
,
995 int dma_dir
, void *buf
, unsigned int buflen
)
997 struct ata_port
*ap
= dev
->ap
;
998 u8 command
= tf
->command
;
999 struct ata_queued_cmd
*qc
;
1000 unsigned int tag
, preempted_tag
;
1001 u32 preempted_sactive
, preempted_qc_active
;
1002 DECLARE_COMPLETION(wait
);
1003 unsigned long flags
;
1004 unsigned int err_mask
;
1007 spin_lock_irqsave(ap
->lock
, flags
);
1009 /* no internal command while frozen */
1010 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1011 spin_unlock_irqrestore(ap
->lock
, flags
);
1012 return AC_ERR_SYSTEM
;
1015 /* initialize internal qc */
1017 /* XXX: Tag 0 is used for drivers with legacy EH as some
1018 * drivers choke if any other tag is given. This breaks
1019 * ata_tag_internal() test for those drivers. Don't use new
1020 * EH stuff without converting to it.
1022 if (ap
->ops
->error_handler
)
1023 tag
= ATA_TAG_INTERNAL
;
1027 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1029 qc
= __ata_qc_from_tag(ap
, tag
);
1037 preempted_tag
= ap
->active_tag
;
1038 preempted_sactive
= ap
->sactive
;
1039 preempted_qc_active
= ap
->qc_active
;
1040 ap
->active_tag
= ATA_TAG_POISON
;
1044 /* prepare & issue qc */
1047 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1048 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1049 qc
->dma_dir
= dma_dir
;
1050 if (dma_dir
!= DMA_NONE
) {
1051 ata_sg_init_one(qc
, buf
, buflen
);
1052 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1055 qc
->private_data
= &wait
;
1056 qc
->complete_fn
= ata_qc_complete_internal
;
1060 spin_unlock_irqrestore(ap
->lock
, flags
);
1062 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1064 ata_port_flush_task(ap
);
1067 spin_lock_irqsave(ap
->lock
, flags
);
1069 /* We're racing with irq here. If we lose, the
1070 * following test prevents us from completing the qc
1071 * twice. If we win, the port is frozen and will be
1072 * cleaned up by ->post_internal_cmd().
1074 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1075 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1077 if (ap
->ops
->error_handler
)
1078 ata_port_freeze(ap
);
1080 ata_qc_complete(qc
);
1082 if (ata_msg_warn(ap
))
1083 ata_dev_printk(dev
, KERN_WARNING
,
1084 "qc timeout (cmd 0x%x)\n", command
);
1087 spin_unlock_irqrestore(ap
->lock
, flags
);
1090 /* do post_internal_cmd */
1091 if (ap
->ops
->post_internal_cmd
)
1092 ap
->ops
->post_internal_cmd(qc
);
1094 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1095 if (ata_msg_warn(ap
))
1096 ata_dev_printk(dev
, KERN_WARNING
,
1097 "zero err_mask for failed "
1098 "internal command, assuming AC_ERR_OTHER\n");
1099 qc
->err_mask
|= AC_ERR_OTHER
;
1103 spin_lock_irqsave(ap
->lock
, flags
);
1105 *tf
= qc
->result_tf
;
1106 err_mask
= qc
->err_mask
;
1109 ap
->active_tag
= preempted_tag
;
1110 ap
->sactive
= preempted_sactive
;
1111 ap
->qc_active
= preempted_qc_active
;
1113 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1114 * Until those drivers are fixed, we detect the condition
1115 * here, fail the command with AC_ERR_SYSTEM and reenable the
1118 * Note that this doesn't change any behavior as internal
1119 * command failure results in disabling the device in the
1120 * higher layer for LLDDs without new reset/EH callbacks.
1122 * Kill the following code as soon as those drivers are fixed.
1124 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1125 err_mask
|= AC_ERR_SYSTEM
;
1129 spin_unlock_irqrestore(ap
->lock
, flags
);
1135 * ata_do_simple_cmd - execute simple internal command
1136 * @dev: Device to which the command is sent
1137 * @cmd: Opcode to execute
1139 * Execute a 'simple' command, that only consists of the opcode
1140 * 'cmd' itself, without filling any other registers
1143 * Kernel thread context (may sleep).
1146 * Zero on success, AC_ERR_* mask on failure
1148 unsigned int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1150 struct ata_taskfile tf
;
1152 ata_tf_init(dev
, &tf
);
1155 tf
.flags
|= ATA_TFLAG_DEVICE
;
1156 tf
.protocol
= ATA_PROT_NODATA
;
1158 return ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1162 * ata_pio_need_iordy - check if iordy needed
1165 * Check if the current speed of the device requires IORDY. Used
1166 * by various controllers for chip configuration.
1169 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1172 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1179 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1181 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1182 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1183 /* Is the speed faster than the drive allows non IORDY ? */
1185 /* This is cycle times not frequency - watch the logic! */
1186 if (pio
> 240) /* PIO2 is 240nS per cycle */
1195 * ata_dev_read_id - Read ID data from the specified device
1196 * @dev: target device
1197 * @p_class: pointer to class of the target device (may be changed)
1198 * @post_reset: is this read ID post-reset?
1199 * @id: buffer to read IDENTIFY data into
1201 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1202 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1203 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1204 * for pre-ATA4 drives.
1207 * Kernel thread context (may sleep)
1210 * 0 on success, -errno otherwise.
1212 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1213 int post_reset
, u16
*id
)
1215 struct ata_port
*ap
= dev
->ap
;
1216 unsigned int class = *p_class
;
1217 struct ata_taskfile tf
;
1218 unsigned int err_mask
= 0;
1222 if (ata_msg_ctl(ap
))
1223 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1224 __FUNCTION__
, ap
->id
, dev
->devno
);
1226 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1229 ata_tf_init(dev
, &tf
);
1233 tf
.command
= ATA_CMD_ID_ATA
;
1236 tf
.command
= ATA_CMD_ID_ATAPI
;
1240 reason
= "unsupported class";
1244 tf
.protocol
= ATA_PROT_PIO
;
1246 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1247 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1250 reason
= "I/O error";
1254 swap_buf_le16(id
, ATA_ID_WORDS
);
1257 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1259 reason
= "device reports illegal type";
1263 if (post_reset
&& class == ATA_DEV_ATA
) {
1265 * The exact sequence expected by certain pre-ATA4 drives is:
1268 * INITIALIZE DEVICE PARAMETERS
1270 * Some drives were very specific about that exact sequence.
1272 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1273 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1276 reason
= "INIT_DEV_PARAMS failed";
1280 /* current CHS translation info (id[53-58]) might be
1281 * changed. reread the identify device info.
1293 if (ata_msg_warn(ap
))
1294 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1295 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1299 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1301 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1304 static void ata_dev_config_ncq(struct ata_device
*dev
,
1305 char *desc
, size_t desc_sz
)
1307 struct ata_port
*ap
= dev
->ap
;
1308 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1310 if (!ata_id_has_ncq(dev
->id
)) {
1315 if (ap
->flags
& ATA_FLAG_NCQ
) {
1316 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1317 dev
->flags
|= ATA_DFLAG_NCQ
;
1320 if (hdepth
>= ddepth
)
1321 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1323 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1327 * ata_dev_configure - Configure the specified ATA/ATAPI device
1328 * @dev: Target device to configure
1329 * @print_info: Enable device info printout
1331 * Configure @dev according to @dev->id. Generic and low-level
1332 * driver specific fixups are also applied.
1335 * Kernel thread context (may sleep)
1338 * 0 on success, -errno otherwise
1340 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1342 struct ata_port
*ap
= dev
->ap
;
1343 const u16
*id
= dev
->id
;
1344 unsigned int xfer_mask
;
1347 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1348 ata_dev_printk(dev
, KERN_INFO
, "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1349 __FUNCTION__
, ap
->id
, dev
->devno
);
1353 if (ata_msg_probe(ap
))
1354 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1355 __FUNCTION__
, ap
->id
, dev
->devno
);
1357 /* print device capabilities */
1358 if (ata_msg_probe(ap
))
1359 ata_dev_printk(dev
, KERN_DEBUG
, "%s: cfg 49:%04x 82:%04x 83:%04x "
1360 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1362 id
[49], id
[82], id
[83], id
[84],
1363 id
[85], id
[86], id
[87], id
[88]);
1365 /* initialize to-be-configured parameters */
1366 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1367 dev
->max_sectors
= 0;
1375 * common ATA, ATAPI feature tests
1378 /* find max transfer mode; for printk only */
1379 xfer_mask
= ata_id_xfermask(id
);
1381 if (ata_msg_probe(ap
))
1384 /* ATA-specific feature tests */
1385 if (dev
->class == ATA_DEV_ATA
) {
1386 dev
->n_sectors
= ata_id_n_sectors(id
);
1388 if (ata_id_has_lba(id
)) {
1389 const char *lba_desc
;
1393 dev
->flags
|= ATA_DFLAG_LBA
;
1394 if (ata_id_has_lba48(id
)) {
1395 dev
->flags
|= ATA_DFLAG_LBA48
;
1400 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1402 /* print device info to dmesg */
1403 if (ata_msg_info(ap
))
1404 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1405 "max %s, %Lu sectors: %s %s\n",
1406 ata_id_major_version(id
),
1407 ata_mode_string(xfer_mask
),
1408 (unsigned long long)dev
->n_sectors
,
1409 lba_desc
, ncq_desc
);
1413 /* Default translation */
1414 dev
->cylinders
= id
[1];
1416 dev
->sectors
= id
[6];
1418 if (ata_id_current_chs_valid(id
)) {
1419 /* Current CHS translation is valid. */
1420 dev
->cylinders
= id
[54];
1421 dev
->heads
= id
[55];
1422 dev
->sectors
= id
[56];
1425 /* print device info to dmesg */
1426 if (ata_msg_info(ap
))
1427 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1428 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1429 ata_id_major_version(id
),
1430 ata_mode_string(xfer_mask
),
1431 (unsigned long long)dev
->n_sectors
,
1432 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1435 if (dev
->id
[59] & 0x100) {
1436 dev
->multi_count
= dev
->id
[59] & 0xff;
1437 if (ata_msg_info(ap
))
1438 ata_dev_printk(dev
, KERN_INFO
, "ata%u: dev %u multi count %u\n",
1439 ap
->id
, dev
->devno
, dev
->multi_count
);
1445 /* ATAPI-specific feature tests */
1446 else if (dev
->class == ATA_DEV_ATAPI
) {
1447 char *cdb_intr_string
= "";
1449 rc
= atapi_cdb_len(id
);
1450 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1451 if (ata_msg_warn(ap
))
1452 ata_dev_printk(dev
, KERN_WARNING
,
1453 "unsupported CDB len\n");
1457 dev
->cdb_len
= (unsigned int) rc
;
1459 if (ata_id_cdb_intr(dev
->id
)) {
1460 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1461 cdb_intr_string
= ", CDB intr";
1464 /* print device info to dmesg */
1465 if (ata_msg_info(ap
))
1466 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1467 ata_mode_string(xfer_mask
),
1471 ap
->host
->max_cmd_len
= 0;
1472 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1473 ap
->host
->max_cmd_len
= max_t(unsigned int,
1474 ap
->host
->max_cmd_len
,
1475 ap
->device
[i
].cdb_len
);
1477 /* limit bridge transfers to udma5, 200 sectors */
1478 if (ata_dev_knobble(dev
)) {
1479 if (ata_msg_info(ap
))
1480 ata_dev_printk(dev
, KERN_INFO
,
1481 "applying bridge limits\n");
1482 dev
->udma_mask
&= ATA_UDMA5
;
1483 dev
->max_sectors
= ATA_MAX_SECTORS
;
1486 if (ap
->ops
->dev_config
)
1487 ap
->ops
->dev_config(ap
, dev
);
1489 if (ata_msg_probe(ap
))
1490 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1491 __FUNCTION__
, ata_chk_status(ap
));
1495 if (ata_msg_probe(ap
))
1496 ata_dev_printk(dev
, KERN_DEBUG
,
1497 "%s: EXIT, err\n", __FUNCTION__
);
1502 * ata_bus_probe - Reset and probe ATA bus
1505 * Master ATA bus probing function. Initiates a hardware-dependent
1506 * bus reset, then attempts to identify any devices found on
1510 * PCI/etc. bus probe sem.
1513 * Zero on success, negative errno otherwise.
1516 static int ata_bus_probe(struct ata_port
*ap
)
1518 unsigned int classes
[ATA_MAX_DEVICES
];
1519 int tries
[ATA_MAX_DEVICES
];
1520 int i
, rc
, down_xfermask
;
1521 struct ata_device
*dev
;
1525 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1526 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1531 /* reset and determine device classes */
1532 ap
->ops
->phy_reset(ap
);
1534 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1535 dev
= &ap
->device
[i
];
1537 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1538 dev
->class != ATA_DEV_UNKNOWN
)
1539 classes
[dev
->devno
] = dev
->class;
1541 classes
[dev
->devno
] = ATA_DEV_NONE
;
1543 dev
->class = ATA_DEV_UNKNOWN
;
1548 /* after the reset the device state is PIO 0 and the controller
1549 state is undefined. Record the mode */
1551 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1552 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1554 /* read IDENTIFY page and configure devices */
1555 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1556 dev
= &ap
->device
[i
];
1559 dev
->class = classes
[i
];
1561 if (!ata_dev_enabled(dev
))
1564 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1568 rc
= ata_dev_configure(dev
, 1);
1573 /* configure transfer mode */
1574 rc
= ata_set_mode(ap
, &dev
);
1580 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1581 if (ata_dev_enabled(&ap
->device
[i
]))
1584 /* no device present, disable port */
1585 ata_port_disable(ap
);
1586 ap
->ops
->port_disable(ap
);
1593 tries
[dev
->devno
] = 0;
1596 sata_down_spd_limit(ap
);
1599 tries
[dev
->devno
]--;
1600 if (down_xfermask
&&
1601 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1602 tries
[dev
->devno
] = 0;
1605 if (!tries
[dev
->devno
]) {
1606 ata_down_xfermask_limit(dev
, 1);
1607 ata_dev_disable(dev
);
1614 * ata_port_probe - Mark port as enabled
1615 * @ap: Port for which we indicate enablement
1617 * Modify @ap data structure such that the system
1618 * thinks that the entire port is enabled.
1620 * LOCKING: host_set lock, or some other form of
1624 void ata_port_probe(struct ata_port
*ap
)
1626 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1630 * sata_print_link_status - Print SATA link status
1631 * @ap: SATA port to printk link status about
1633 * This function prints link speed and status of a SATA link.
1638 static void sata_print_link_status(struct ata_port
*ap
)
1640 u32 sstatus
, scontrol
, tmp
;
1642 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1644 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1646 if (ata_port_online(ap
)) {
1647 tmp
= (sstatus
>> 4) & 0xf;
1648 ata_port_printk(ap
, KERN_INFO
,
1649 "SATA link up %s (SStatus %X SControl %X)\n",
1650 sata_spd_string(tmp
), sstatus
, scontrol
);
1652 ata_port_printk(ap
, KERN_INFO
,
1653 "SATA link down (SStatus %X SControl %X)\n",
1659 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1660 * @ap: SATA port associated with target SATA PHY.
1662 * This function issues commands to standard SATA Sxxx
1663 * PHY registers, to wake up the phy (and device), and
1664 * clear any reset condition.
1667 * PCI/etc. bus probe sem.
1670 void __sata_phy_reset(struct ata_port
*ap
)
1673 unsigned long timeout
= jiffies
+ (HZ
* 5);
1675 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1676 /* issue phy wake/reset */
1677 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1678 /* Couldn't find anything in SATA I/II specs, but
1679 * AHCI-1.1 10.4.2 says at least 1 ms. */
1682 /* phy wake/clear reset */
1683 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1685 /* wait for phy to become ready, if necessary */
1688 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1689 if ((sstatus
& 0xf) != 1)
1691 } while (time_before(jiffies
, timeout
));
1693 /* print link status */
1694 sata_print_link_status(ap
);
1696 /* TODO: phy layer with polling, timeouts, etc. */
1697 if (!ata_port_offline(ap
))
1700 ata_port_disable(ap
);
1702 if (ap
->flags
& ATA_FLAG_DISABLED
)
1705 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1706 ata_port_disable(ap
);
1710 ap
->cbl
= ATA_CBL_SATA
;
1714 * sata_phy_reset - Reset SATA bus.
1715 * @ap: SATA port associated with target SATA PHY.
1717 * This function resets the SATA bus, and then probes
1718 * the bus for devices.
1721 * PCI/etc. bus probe sem.
1724 void sata_phy_reset(struct ata_port
*ap
)
1726 __sata_phy_reset(ap
);
1727 if (ap
->flags
& ATA_FLAG_DISABLED
)
1733 * ata_dev_pair - return other device on cable
1736 * Obtain the other device on the same cable, or if none is
1737 * present NULL is returned
1740 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1742 struct ata_port
*ap
= adev
->ap
;
1743 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1744 if (!ata_dev_enabled(pair
))
1750 * ata_port_disable - Disable port.
1751 * @ap: Port to be disabled.
1753 * Modify @ap data structure such that the system
1754 * thinks that the entire port is disabled, and should
1755 * never attempt to probe or communicate with devices
1758 * LOCKING: host_set lock, or some other form of
1762 void ata_port_disable(struct ata_port
*ap
)
1764 ap
->device
[0].class = ATA_DEV_NONE
;
1765 ap
->device
[1].class = ATA_DEV_NONE
;
1766 ap
->flags
|= ATA_FLAG_DISABLED
;
1770 * sata_down_spd_limit - adjust SATA spd limit downward
1771 * @ap: Port to adjust SATA spd limit for
1773 * Adjust SATA spd limit of @ap downward. Note that this
1774 * function only adjusts the limit. The change must be applied
1775 * using sata_set_spd().
1778 * Inherited from caller.
1781 * 0 on success, negative errno on failure
1783 int sata_down_spd_limit(struct ata_port
*ap
)
1785 u32 sstatus
, spd
, mask
;
1788 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1792 mask
= ap
->sata_spd_limit
;
1795 highbit
= fls(mask
) - 1;
1796 mask
&= ~(1 << highbit
);
1798 spd
= (sstatus
>> 4) & 0xf;
1802 mask
&= (1 << spd
) - 1;
1806 ap
->sata_spd_limit
= mask
;
1808 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1809 sata_spd_string(fls(mask
)));
1814 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1818 if (ap
->sata_spd_limit
== UINT_MAX
)
1821 limit
= fls(ap
->sata_spd_limit
);
1823 spd
= (*scontrol
>> 4) & 0xf;
1824 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1826 return spd
!= limit
;
1830 * sata_set_spd_needed - is SATA spd configuration needed
1831 * @ap: Port in question
1833 * Test whether the spd limit in SControl matches
1834 * @ap->sata_spd_limit. This function is used to determine
1835 * whether hardreset is necessary to apply SATA spd
1839 * Inherited from caller.
1842 * 1 if SATA spd configuration is needed, 0 otherwise.
1844 int sata_set_spd_needed(struct ata_port
*ap
)
1848 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1851 return __sata_set_spd_needed(ap
, &scontrol
);
1855 * sata_set_spd - set SATA spd according to spd limit
1856 * @ap: Port to set SATA spd for
1858 * Set SATA spd of @ap according to sata_spd_limit.
1861 * Inherited from caller.
1864 * 0 if spd doesn't need to be changed, 1 if spd has been
1865 * changed. Negative errno if SCR registers are inaccessible.
1867 int sata_set_spd(struct ata_port
*ap
)
1872 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1875 if (!__sata_set_spd_needed(ap
, &scontrol
))
1878 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1885 * This mode timing computation functionality is ported over from
1886 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1889 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1890 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1891 * for PIO 5, which is a nonstandard extension and UDMA6, which
1892 * is currently supported only by Maxtor drives.
1895 static const struct ata_timing ata_timing
[] = {
1897 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1898 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1899 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1900 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1902 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1903 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1904 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1906 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1908 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1909 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1910 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1912 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1913 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1914 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1916 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1917 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1918 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1920 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1921 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1922 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1924 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1929 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1930 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1932 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1934 q
->setup
= EZ(t
->setup
* 1000, T
);
1935 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1936 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1937 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1938 q
->active
= EZ(t
->active
* 1000, T
);
1939 q
->recover
= EZ(t
->recover
* 1000, T
);
1940 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1941 q
->udma
= EZ(t
->udma
* 1000, UT
);
1944 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1945 struct ata_timing
*m
, unsigned int what
)
1947 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1948 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1949 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1950 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1951 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1952 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1953 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1954 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1957 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1959 const struct ata_timing
*t
;
1961 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1962 if (t
->mode
== 0xFF)
1967 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1968 struct ata_timing
*t
, int T
, int UT
)
1970 const struct ata_timing
*s
;
1971 struct ata_timing p
;
1977 if (!(s
= ata_timing_find_mode(speed
)))
1980 memcpy(t
, s
, sizeof(*s
));
1983 * If the drive is an EIDE drive, it can tell us it needs extended
1984 * PIO/MW_DMA cycle timing.
1987 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1988 memset(&p
, 0, sizeof(p
));
1989 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1990 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1991 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1992 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1993 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1995 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1999 * Convert the timing to bus clock counts.
2002 ata_timing_quantize(t
, t
, T
, UT
);
2005 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2006 * S.M.A.R.T * and some other commands. We have to ensure that the
2007 * DMA cycle timing is slower/equal than the fastest PIO timing.
2010 if (speed
> XFER_PIO_4
) {
2011 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2012 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2016 * Lengthen active & recovery time so that cycle time is correct.
2019 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2020 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2021 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2024 if (t
->active
+ t
->recover
< t
->cycle
) {
2025 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2026 t
->recover
= t
->cycle
- t
->active
;
2033 * ata_down_xfermask_limit - adjust dev xfer masks downward
2034 * @dev: Device to adjust xfer masks
2035 * @force_pio0: Force PIO0
2037 * Adjust xfer masks of @dev downward. Note that this function
2038 * does not apply the change. Invoking ata_set_mode() afterwards
2039 * will apply the limit.
2042 * Inherited from caller.
2045 * 0 on success, negative errno on failure
2047 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2049 unsigned long xfer_mask
;
2052 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2057 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2058 if (xfer_mask
& ATA_MASK_UDMA
)
2059 xfer_mask
&= ~ATA_MASK_MWDMA
;
2061 highbit
= fls(xfer_mask
) - 1;
2062 xfer_mask
&= ~(1 << highbit
);
2064 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2068 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2071 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2072 ata_mode_string(xfer_mask
));
2080 static int ata_dev_set_mode(struct ata_device
*dev
)
2082 unsigned int err_mask
;
2085 dev
->flags
&= ~ATA_DFLAG_PIO
;
2086 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2087 dev
->flags
|= ATA_DFLAG_PIO
;
2089 err_mask
= ata_dev_set_xfermode(dev
);
2091 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2092 "(err_mask=0x%x)\n", err_mask
);
2096 rc
= ata_dev_revalidate(dev
, 0);
2100 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2101 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2103 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2104 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2109 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2110 * @ap: port on which timings will be programmed
2111 * @r_failed_dev: out paramter for failed device
2113 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2114 * ata_set_mode() fails, pointer to the failing device is
2115 * returned in @r_failed_dev.
2118 * PCI/etc. bus probe sem.
2121 * 0 on success, negative errno otherwise
2123 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2125 struct ata_device
*dev
;
2126 int i
, rc
= 0, used_dma
= 0, found
= 0;
2128 /* has private set_mode? */
2129 if (ap
->ops
->set_mode
) {
2130 /* FIXME: make ->set_mode handle no device case and
2131 * return error code and failing device on failure.
2133 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2134 if (ata_dev_enabled(&ap
->device
[i
])) {
2135 ap
->ops
->set_mode(ap
);
2142 /* step 1: calculate xfer_mask */
2143 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2144 unsigned int pio_mask
, dma_mask
;
2146 dev
= &ap
->device
[i
];
2148 if (!ata_dev_enabled(dev
))
2151 ata_dev_xfermask(dev
);
2153 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2154 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2155 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2156 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2165 /* step 2: always set host PIO timings */
2166 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2167 dev
= &ap
->device
[i
];
2168 if (!ata_dev_enabled(dev
))
2171 if (!dev
->pio_mode
) {
2172 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2177 dev
->xfer_mode
= dev
->pio_mode
;
2178 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2179 if (ap
->ops
->set_piomode
)
2180 ap
->ops
->set_piomode(ap
, dev
);
2183 /* step 3: set host DMA timings */
2184 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2185 dev
= &ap
->device
[i
];
2187 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2190 dev
->xfer_mode
= dev
->dma_mode
;
2191 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2192 if (ap
->ops
->set_dmamode
)
2193 ap
->ops
->set_dmamode(ap
, dev
);
2196 /* step 4: update devices' xfer mode */
2197 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2198 dev
= &ap
->device
[i
];
2200 if (!ata_dev_enabled(dev
))
2203 rc
= ata_dev_set_mode(dev
);
2208 /* Record simplex status. If we selected DMA then the other
2209 * host channels are not permitted to do so.
2211 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2212 ap
->host_set
->simplex_claimed
= 1;
2214 /* step5: chip specific finalisation */
2215 if (ap
->ops
->post_set_mode
)
2216 ap
->ops
->post_set_mode(ap
);
2220 *r_failed_dev
= dev
;
2225 * ata_tf_to_host - issue ATA taskfile to host controller
2226 * @ap: port to which command is being issued
2227 * @tf: ATA taskfile register set
2229 * Issues ATA taskfile register set to ATA host controller,
2230 * with proper synchronization with interrupt handler and
2234 * spin_lock_irqsave(host_set lock)
2237 static inline void ata_tf_to_host(struct ata_port
*ap
,
2238 const struct ata_taskfile
*tf
)
2240 ap
->ops
->tf_load(ap
, tf
);
2241 ap
->ops
->exec_command(ap
, tf
);
2245 * ata_busy_sleep - sleep until BSY clears, or timeout
2246 * @ap: port containing status register to be polled
2247 * @tmout_pat: impatience timeout
2248 * @tmout: overall timeout
2250 * Sleep until ATA Status register bit BSY clears,
2251 * or a timeout occurs.
2256 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2257 unsigned long tmout_pat
, unsigned long tmout
)
2259 unsigned long timer_start
, timeout
;
2262 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2263 timer_start
= jiffies
;
2264 timeout
= timer_start
+ tmout_pat
;
2265 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2267 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2270 if (status
& ATA_BUSY
)
2271 ata_port_printk(ap
, KERN_WARNING
,
2272 "port is slow to respond, please be patient\n");
2274 timeout
= timer_start
+ tmout
;
2275 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2277 status
= ata_chk_status(ap
);
2280 if (status
& ATA_BUSY
) {
2281 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2282 "(%lu secs)\n", tmout
/ HZ
);
2289 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2291 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2292 unsigned int dev0
= devmask
& (1 << 0);
2293 unsigned int dev1
= devmask
& (1 << 1);
2294 unsigned long timeout
;
2296 /* if device 0 was found in ata_devchk, wait for its
2300 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2302 /* if device 1 was found in ata_devchk, wait for
2303 * register access, then wait for BSY to clear
2305 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2309 ap
->ops
->dev_select(ap
, 1);
2310 if (ap
->flags
& ATA_FLAG_MMIO
) {
2311 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2312 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2314 nsect
= inb(ioaddr
->nsect_addr
);
2315 lbal
= inb(ioaddr
->lbal_addr
);
2317 if ((nsect
== 1) && (lbal
== 1))
2319 if (time_after(jiffies
, timeout
)) {
2323 msleep(50); /* give drive a breather */
2326 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2328 /* is all this really necessary? */
2329 ap
->ops
->dev_select(ap
, 0);
2331 ap
->ops
->dev_select(ap
, 1);
2333 ap
->ops
->dev_select(ap
, 0);
2336 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2337 unsigned int devmask
)
2339 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2341 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2343 /* software reset. causes dev0 to be selected */
2344 if (ap
->flags
& ATA_FLAG_MMIO
) {
2345 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2346 udelay(20); /* FIXME: flush */
2347 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2348 udelay(20); /* FIXME: flush */
2349 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2351 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2353 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2355 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2358 /* spec mandates ">= 2ms" before checking status.
2359 * We wait 150ms, because that was the magic delay used for
2360 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2361 * between when the ATA command register is written, and then
2362 * status is checked. Because waiting for "a while" before
2363 * checking status is fine, post SRST, we perform this magic
2364 * delay here as well.
2366 * Old drivers/ide uses the 2mS rule and then waits for ready
2370 /* Before we perform post reset processing we want to see if
2371 * the bus shows 0xFF because the odd clown forgets the D7
2372 * pulldown resistor.
2374 if (ata_check_status(ap
) == 0xFF) {
2375 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2376 return AC_ERR_OTHER
;
2379 ata_bus_post_reset(ap
, devmask
);
2385 * ata_bus_reset - reset host port and associated ATA channel
2386 * @ap: port to reset
2388 * This is typically the first time we actually start issuing
2389 * commands to the ATA channel. We wait for BSY to clear, then
2390 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2391 * result. Determine what devices, if any, are on the channel
2392 * by looking at the device 0/1 error register. Look at the signature
2393 * stored in each device's taskfile registers, to determine if
2394 * the device is ATA or ATAPI.
2397 * PCI/etc. bus probe sem.
2398 * Obtains host_set lock.
2401 * Sets ATA_FLAG_DISABLED if bus reset fails.
2404 void ata_bus_reset(struct ata_port
*ap
)
2406 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2407 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2409 unsigned int dev0
, dev1
= 0, devmask
= 0;
2411 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2413 /* determine if device 0/1 are present */
2414 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2417 dev0
= ata_devchk(ap
, 0);
2419 dev1
= ata_devchk(ap
, 1);
2423 devmask
|= (1 << 0);
2425 devmask
|= (1 << 1);
2427 /* select device 0 again */
2428 ap
->ops
->dev_select(ap
, 0);
2430 /* issue bus reset */
2431 if (ap
->flags
& ATA_FLAG_SRST
)
2432 if (ata_bus_softreset(ap
, devmask
))
2436 * determine by signature whether we have ATA or ATAPI devices
2438 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2439 if ((slave_possible
) && (err
!= 0x81))
2440 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2442 /* re-enable interrupts */
2443 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2446 /* is double-select really necessary? */
2447 if (ap
->device
[1].class != ATA_DEV_NONE
)
2448 ap
->ops
->dev_select(ap
, 1);
2449 if (ap
->device
[0].class != ATA_DEV_NONE
)
2450 ap
->ops
->dev_select(ap
, 0);
2452 /* if no devices were detected, disable this port */
2453 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2454 (ap
->device
[1].class == ATA_DEV_NONE
))
2457 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2458 /* set up device control for ATA_FLAG_SATA_RESET */
2459 if (ap
->flags
& ATA_FLAG_MMIO
)
2460 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2462 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2469 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2470 ap
->ops
->port_disable(ap
);
2476 * sata_phy_debounce - debounce SATA phy status
2477 * @ap: ATA port to debounce SATA phy status for
2478 * @params: timing parameters { interval, duratinon, timeout } in msec
2480 * Make sure SStatus of @ap reaches stable state, determined by
2481 * holding the same value where DET is not 1 for @duration polled
2482 * every @interval, before @timeout. Timeout constraints the
2483 * beginning of the stable state. Because, after hot unplugging,
2484 * DET gets stuck at 1 on some controllers, this functions waits
2485 * until timeout then returns 0 if DET is stable at 1.
2488 * Kernel thread context (may sleep)
2491 * 0 on success, -errno on failure.
2493 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2495 unsigned long interval_msec
= params
[0];
2496 unsigned long duration
= params
[1] * HZ
/ 1000;
2497 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2498 unsigned long last_jiffies
;
2502 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2507 last_jiffies
= jiffies
;
2510 msleep(interval_msec
);
2511 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2517 if (cur
== 1 && time_before(jiffies
, timeout
))
2519 if (time_after(jiffies
, last_jiffies
+ duration
))
2524 /* unstable, start over */
2526 last_jiffies
= jiffies
;
2529 if (time_after(jiffies
, timeout
))
2535 * sata_phy_resume - resume SATA phy
2536 * @ap: ATA port to resume SATA phy for
2537 * @params: timing parameters { interval, duratinon, timeout } in msec
2539 * Resume SATA phy of @ap and debounce it.
2542 * Kernel thread context (may sleep)
2545 * 0 on success, -errno on failure.
2547 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2552 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2555 scontrol
= (scontrol
& 0x0f0) | 0x300;
2557 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2560 /* Some PHYs react badly if SStatus is pounded immediately
2561 * after resuming. Delay 200ms before debouncing.
2565 return sata_phy_debounce(ap
, params
);
2568 static void ata_wait_spinup(struct ata_port
*ap
)
2570 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2571 unsigned long end
, secs
;
2574 /* first, debounce phy if SATA */
2575 if (ap
->cbl
== ATA_CBL_SATA
) {
2576 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2578 /* if debounced successfully and offline, no need to wait */
2579 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2583 /* okay, let's give the drive time to spin up */
2584 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2585 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2587 if (time_after(jiffies
, end
))
2591 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2592 "(%lu secs)\n", secs
);
2594 schedule_timeout_uninterruptible(end
- jiffies
);
2598 * ata_std_prereset - prepare for reset
2599 * @ap: ATA port to be reset
2601 * @ap is about to be reset. Initialize it.
2604 * Kernel thread context (may sleep)
2607 * 0 on success, -errno otherwise.
2609 int ata_std_prereset(struct ata_port
*ap
)
2611 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2612 const unsigned long *timing
;
2616 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2617 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2618 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2619 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2620 ata_wait_spinup(ap
);
2623 /* if we're about to do hardreset, nothing more to do */
2624 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2627 /* if SATA, resume phy */
2628 if (ap
->cbl
== ATA_CBL_SATA
) {
2629 if (ap
->flags
& ATA_FLAG_LOADING
)
2630 timing
= sata_deb_timing_boot
;
2632 timing
= sata_deb_timing_eh
;
2634 rc
= sata_phy_resume(ap
, timing
);
2635 if (rc
&& rc
!= -EOPNOTSUPP
) {
2636 /* phy resume failed */
2637 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2638 "link for reset (errno=%d)\n", rc
);
2643 /* Wait for !BSY if the controller can wait for the first D2H
2644 * Reg FIS and we don't know that no device is attached.
2646 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2647 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2653 * ata_std_softreset - reset host port via ATA SRST
2654 * @ap: port to reset
2655 * @classes: resulting classes of attached devices
2657 * Reset host port using ATA SRST.
2660 * Kernel thread context (may sleep)
2663 * 0 on success, -errno otherwise.
2665 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2667 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2668 unsigned int devmask
= 0, err_mask
;
2673 if (ata_port_offline(ap
)) {
2674 classes
[0] = ATA_DEV_NONE
;
2678 /* determine if device 0/1 are present */
2679 if (ata_devchk(ap
, 0))
2680 devmask
|= (1 << 0);
2681 if (slave_possible
&& ata_devchk(ap
, 1))
2682 devmask
|= (1 << 1);
2684 /* select device 0 again */
2685 ap
->ops
->dev_select(ap
, 0);
2687 /* issue bus reset */
2688 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2689 err_mask
= ata_bus_softreset(ap
, devmask
);
2691 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2696 /* determine by signature whether we have ATA or ATAPI devices */
2697 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2698 if (slave_possible
&& err
!= 0x81)
2699 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2702 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2707 * sata_std_hardreset - reset host port via SATA phy reset
2708 * @ap: port to reset
2709 * @class: resulting class of attached device
2711 * SATA phy-reset host port using DET bits of SControl register.
2714 * Kernel thread context (may sleep)
2717 * 0 on success, -errno otherwise.
2719 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2726 if (sata_set_spd_needed(ap
)) {
2727 /* SATA spec says nothing about how to reconfigure
2728 * spd. To be on the safe side, turn off phy during
2729 * reconfiguration. This works for at least ICH7 AHCI
2732 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2735 scontrol
= (scontrol
& 0x0f0) | 0x302;
2737 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2743 /* issue phy wake/reset */
2744 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2747 scontrol
= (scontrol
& 0x0f0) | 0x301;
2749 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2752 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2753 * 10.4.2 says at least 1 ms.
2757 /* bring phy back */
2758 sata_phy_resume(ap
, sata_deb_timing_eh
);
2760 /* TODO: phy layer with polling, timeouts, etc. */
2761 if (ata_port_offline(ap
)) {
2762 *class = ATA_DEV_NONE
;
2763 DPRINTK("EXIT, link offline\n");
2767 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2768 ata_port_printk(ap
, KERN_ERR
,
2769 "COMRESET failed (device not ready)\n");
2773 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2775 *class = ata_dev_try_classify(ap
, 0, NULL
);
2777 DPRINTK("EXIT, class=%u\n", *class);
2782 * ata_std_postreset - standard postreset callback
2783 * @ap: the target ata_port
2784 * @classes: classes of attached devices
2786 * This function is invoked after a successful reset. Note that
2787 * the device might have been reset more than once using
2788 * different reset methods before postreset is invoked.
2791 * Kernel thread context (may sleep)
2793 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2799 /* print link status */
2800 sata_print_link_status(ap
);
2803 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2804 sata_scr_write(ap
, SCR_ERROR
, serror
);
2806 /* re-enable interrupts */
2807 if (!ap
->ops
->error_handler
) {
2808 /* FIXME: hack. create a hook instead */
2809 if (ap
->ioaddr
.ctl_addr
)
2813 /* is double-select really necessary? */
2814 if (classes
[0] != ATA_DEV_NONE
)
2815 ap
->ops
->dev_select(ap
, 1);
2816 if (classes
[1] != ATA_DEV_NONE
)
2817 ap
->ops
->dev_select(ap
, 0);
2819 /* bail out if no device is present */
2820 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2821 DPRINTK("EXIT, no device\n");
2825 /* set up device control */
2826 if (ap
->ioaddr
.ctl_addr
) {
2827 if (ap
->flags
& ATA_FLAG_MMIO
)
2828 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2830 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2837 * ata_dev_same_device - Determine whether new ID matches configured device
2838 * @dev: device to compare against
2839 * @new_class: class of the new device
2840 * @new_id: IDENTIFY page of the new device
2842 * Compare @new_class and @new_id against @dev and determine
2843 * whether @dev is the device indicated by @new_class and
2850 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2852 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2855 const u16
*old_id
= dev
->id
;
2856 unsigned char model
[2][41], serial
[2][21];
2859 if (dev
->class != new_class
) {
2860 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2861 dev
->class, new_class
);
2865 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2866 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2867 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2868 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2869 new_n_sectors
= ata_id_n_sectors(new_id
);
2871 if (strcmp(model
[0], model
[1])) {
2872 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2873 "'%s' != '%s'\n", model
[0], model
[1]);
2877 if (strcmp(serial
[0], serial
[1])) {
2878 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2879 "'%s' != '%s'\n", serial
[0], serial
[1]);
2883 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2884 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2886 (unsigned long long)dev
->n_sectors
,
2887 (unsigned long long)new_n_sectors
);
2895 * ata_dev_revalidate - Revalidate ATA device
2896 * @dev: device to revalidate
2897 * @post_reset: is this revalidation after reset?
2899 * Re-read IDENTIFY page and make sure @dev is still attached to
2903 * Kernel thread context (may sleep)
2906 * 0 on success, negative errno otherwise
2908 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2910 unsigned int class = dev
->class;
2911 u16
*id
= (void *)dev
->ap
->sector_buf
;
2914 if (!ata_dev_enabled(dev
)) {
2920 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2924 /* is the device still there? */
2925 if (!ata_dev_same_device(dev
, class, id
)) {
2930 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2932 /* configure device according to the new ID */
2933 rc
= ata_dev_configure(dev
, 0);
2938 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2942 static const char * const ata_dma_blacklist
[] = {
2943 "WDC AC11000H", NULL
,
2944 "WDC AC22100H", NULL
,
2945 "WDC AC32500H", NULL
,
2946 "WDC AC33100H", NULL
,
2947 "WDC AC31600H", NULL
,
2948 "WDC AC32100H", "24.09P07",
2949 "WDC AC23200L", "21.10N21",
2950 "Compaq CRD-8241B", NULL
,
2955 "SanDisk SDP3B", NULL
,
2956 "SanDisk SDP3B-64", NULL
,
2957 "SANYO CD-ROM CRD", NULL
,
2958 "HITACHI CDR-8", NULL
,
2959 "HITACHI CDR-8335", NULL
,
2960 "HITACHI CDR-8435", NULL
,
2961 "Toshiba CD-ROM XM-6202B", NULL
,
2962 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2964 "E-IDE CD-ROM CR-840", NULL
,
2965 "CD-ROM Drive/F5A", NULL
,
2966 "WPI CDD-820", NULL
,
2967 "SAMSUNG CD-ROM SC-148C", NULL
,
2968 "SAMSUNG CD-ROM SC", NULL
,
2969 "SanDisk SDP3B-64", NULL
,
2970 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2971 "_NEC DV5800A", NULL
,
2972 "SAMSUNG CD-ROM SN-124", "N001"
2975 static int ata_strim(char *s
, size_t len
)
2977 len
= strnlen(s
, len
);
2979 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2980 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2987 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2989 unsigned char model_num
[40];
2990 unsigned char model_rev
[16];
2991 unsigned int nlen
, rlen
;
2994 /* We don't support polling DMA.
2995 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
2996 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
2998 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
2999 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
3002 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3004 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3006 nlen
= ata_strim(model_num
, sizeof(model_num
));
3007 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3009 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3010 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3011 if (ata_dma_blacklist
[i
+1] == NULL
)
3013 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3021 * ata_dev_xfermask - Compute supported xfermask of the given device
3022 * @dev: Device to compute xfermask for
3024 * Compute supported xfermask of @dev and store it in
3025 * dev->*_mask. This function is responsible for applying all
3026 * known limits including host controller limits, device
3029 * FIXME: The current implementation limits all transfer modes to
3030 * the fastest of the lowested device on the port. This is not
3031 * required on most controllers.
3036 static void ata_dev_xfermask(struct ata_device
*dev
)
3038 struct ata_port
*ap
= dev
->ap
;
3039 struct ata_host_set
*hs
= ap
->host_set
;
3040 unsigned long xfer_mask
;
3043 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3044 ap
->mwdma_mask
, ap
->udma_mask
);
3046 /* Apply cable rule here. Don't apply it early because when
3047 * we handle hot plug the cable type can itself change.
3049 if (ap
->cbl
== ATA_CBL_PATA40
)
3050 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3052 /* FIXME: Use port-wide xfermask for now */
3053 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3054 struct ata_device
*d
= &ap
->device
[i
];
3056 if (ata_dev_absent(d
))
3059 if (ata_dev_disabled(d
)) {
3060 /* to avoid violating device selection timing */
3061 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3062 UINT_MAX
, UINT_MAX
);
3066 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3067 d
->mwdma_mask
, d
->udma_mask
);
3068 xfer_mask
&= ata_id_xfermask(d
->id
);
3069 if (ata_dma_blacklisted(d
))
3070 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3073 if (ata_dma_blacklisted(dev
))
3074 ata_dev_printk(dev
, KERN_WARNING
,
3075 "device is on DMA blacklist, disabling DMA\n");
3077 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3078 if (hs
->simplex_claimed
)
3079 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3082 if (ap
->ops
->mode_filter
)
3083 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3085 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3086 &dev
->mwdma_mask
, &dev
->udma_mask
);
3090 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3091 * @dev: Device to which command will be sent
3093 * Issue SET FEATURES - XFER MODE command to device @dev
3097 * PCI/etc. bus probe sem.
3100 * 0 on success, AC_ERR_* mask otherwise.
3103 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3105 struct ata_taskfile tf
;
3106 unsigned int err_mask
;
3108 /* set up set-features taskfile */
3109 DPRINTK("set features - xfer mode\n");
3111 ata_tf_init(dev
, &tf
);
3112 tf
.command
= ATA_CMD_SET_FEATURES
;
3113 tf
.feature
= SETFEATURES_XFER
;
3114 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3115 tf
.protocol
= ATA_PROT_NODATA
;
3116 tf
.nsect
= dev
->xfer_mode
;
3118 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3120 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3125 * ata_dev_init_params - Issue INIT DEV PARAMS command
3126 * @dev: Device to which command will be sent
3127 * @heads: Number of heads (taskfile parameter)
3128 * @sectors: Number of sectors (taskfile parameter)
3131 * Kernel thread context (may sleep)
3134 * 0 on success, AC_ERR_* mask otherwise.
3136 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3137 u16 heads
, u16 sectors
)
3139 struct ata_taskfile tf
;
3140 unsigned int err_mask
;
3142 /* Number of sectors per track 1-255. Number of heads 1-16 */
3143 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3144 return AC_ERR_INVALID
;
3146 /* set up init dev params taskfile */
3147 DPRINTK("init dev params \n");
3149 ata_tf_init(dev
, &tf
);
3150 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3151 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3152 tf
.protocol
= ATA_PROT_NODATA
;
3154 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3156 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3158 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3163 * ata_sg_clean - Unmap DMA memory associated with command
3164 * @qc: Command containing DMA memory to be released
3166 * Unmap all mapped DMA memory associated with this command.
3169 * spin_lock_irqsave(host_set lock)
3172 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3174 struct ata_port
*ap
= qc
->ap
;
3175 struct scatterlist
*sg
= qc
->__sg
;
3176 int dir
= qc
->dma_dir
;
3177 void *pad_buf
= NULL
;
3179 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3180 WARN_ON(sg
== NULL
);
3182 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3183 WARN_ON(qc
->n_elem
> 1);
3185 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3187 /* if we padded the buffer out to 32-bit bound, and data
3188 * xfer direction is from-device, we must copy from the
3189 * pad buffer back into the supplied buffer
3191 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3192 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3194 if (qc
->flags
& ATA_QCFLAG_SG
) {
3196 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3197 /* restore last sg */
3198 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3200 struct scatterlist
*psg
= &qc
->pad_sgent
;
3201 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3202 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3203 kunmap_atomic(addr
, KM_IRQ0
);
3207 dma_unmap_single(ap
->dev
,
3208 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3211 sg
->length
+= qc
->pad_len
;
3213 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3214 pad_buf
, qc
->pad_len
);
3217 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3222 * ata_fill_sg - Fill PCI IDE PRD table
3223 * @qc: Metadata associated with taskfile to be transferred
3225 * Fill PCI IDE PRD (scatter-gather) table with segments
3226 * associated with the current disk command.
3229 * spin_lock_irqsave(host_set lock)
3232 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3234 struct ata_port
*ap
= qc
->ap
;
3235 struct scatterlist
*sg
;
3238 WARN_ON(qc
->__sg
== NULL
);
3239 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3242 ata_for_each_sg(sg
, qc
) {
3246 /* determine if physical DMA addr spans 64K boundary.
3247 * Note h/w doesn't support 64-bit, so we unconditionally
3248 * truncate dma_addr_t to u32.
3250 addr
= (u32
) sg_dma_address(sg
);
3251 sg_len
= sg_dma_len(sg
);
3254 offset
= addr
& 0xffff;
3256 if ((offset
+ sg_len
) > 0x10000)
3257 len
= 0x10000 - offset
;
3259 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3260 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3261 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3270 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3273 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3274 * @qc: Metadata associated with taskfile to check
3276 * Allow low-level driver to filter ATA PACKET commands, returning
3277 * a status indicating whether or not it is OK to use DMA for the
3278 * supplied PACKET command.
3281 * spin_lock_irqsave(host_set lock)
3283 * RETURNS: 0 when ATAPI DMA can be used
3286 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3288 struct ata_port
*ap
= qc
->ap
;
3289 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3291 if (ap
->ops
->check_atapi_dma
)
3292 rc
= ap
->ops
->check_atapi_dma(qc
);
3297 * ata_qc_prep - Prepare taskfile for submission
3298 * @qc: Metadata associated with taskfile to be prepared
3300 * Prepare ATA taskfile for submission.
3303 * spin_lock_irqsave(host_set lock)
3305 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3307 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3313 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3316 * ata_sg_init_one - Associate command with memory buffer
3317 * @qc: Command to be associated
3318 * @buf: Memory buffer
3319 * @buflen: Length of memory buffer, in bytes.
3321 * Initialize the data-related elements of queued_cmd @qc
3322 * to point to a single memory buffer, @buf of byte length @buflen.
3325 * spin_lock_irqsave(host_set lock)
3328 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3330 struct scatterlist
*sg
;
3332 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3334 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3335 qc
->__sg
= &qc
->sgent
;
3337 qc
->orig_n_elem
= 1;
3339 qc
->nbytes
= buflen
;
3342 sg_init_one(sg
, buf
, buflen
);
3346 * ata_sg_init - Associate command with scatter-gather table.
3347 * @qc: Command to be associated
3348 * @sg: Scatter-gather table.
3349 * @n_elem: Number of elements in s/g table.
3351 * Initialize the data-related elements of queued_cmd @qc
3352 * to point to a scatter-gather table @sg, containing @n_elem
3356 * spin_lock_irqsave(host_set lock)
3359 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3360 unsigned int n_elem
)
3362 qc
->flags
|= ATA_QCFLAG_SG
;
3364 qc
->n_elem
= n_elem
;
3365 qc
->orig_n_elem
= n_elem
;
3369 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3370 * @qc: Command with memory buffer to be mapped.
3372 * DMA-map the memory buffer associated with queued_cmd @qc.
3375 * spin_lock_irqsave(host_set lock)
3378 * Zero on success, negative on error.
3381 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3383 struct ata_port
*ap
= qc
->ap
;
3384 int dir
= qc
->dma_dir
;
3385 struct scatterlist
*sg
= qc
->__sg
;
3386 dma_addr_t dma_address
;
3389 /* we must lengthen transfers to end on a 32-bit boundary */
3390 qc
->pad_len
= sg
->length
& 3;
3392 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3393 struct scatterlist
*psg
= &qc
->pad_sgent
;
3395 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3397 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3399 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3400 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3403 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3404 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3406 sg
->length
-= qc
->pad_len
;
3407 if (sg
->length
== 0)
3410 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3411 sg
->length
, qc
->pad_len
);
3419 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3421 if (dma_mapping_error(dma_address
)) {
3423 sg
->length
+= qc
->pad_len
;
3427 sg_dma_address(sg
) = dma_address
;
3428 sg_dma_len(sg
) = sg
->length
;
3431 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3432 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3438 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3439 * @qc: Command with scatter-gather table to be mapped.
3441 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3444 * spin_lock_irqsave(host_set lock)
3447 * Zero on success, negative on error.
3451 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3453 struct ata_port
*ap
= qc
->ap
;
3454 struct scatterlist
*sg
= qc
->__sg
;
3455 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3456 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3458 VPRINTK("ENTER, ata%u\n", ap
->id
);
3459 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3461 /* we must lengthen transfers to end on a 32-bit boundary */
3462 qc
->pad_len
= lsg
->length
& 3;
3464 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3465 struct scatterlist
*psg
= &qc
->pad_sgent
;
3466 unsigned int offset
;
3468 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3470 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3473 * psg->page/offset are used to copy to-be-written
3474 * data in this function or read data in ata_sg_clean.
3476 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3477 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3478 psg
->offset
= offset_in_page(offset
);
3480 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3481 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3482 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3483 kunmap_atomic(addr
, KM_IRQ0
);
3486 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3487 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3489 lsg
->length
-= qc
->pad_len
;
3490 if (lsg
->length
== 0)
3493 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3494 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3497 pre_n_elem
= qc
->n_elem
;
3498 if (trim_sg
&& pre_n_elem
)
3507 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3509 /* restore last sg */
3510 lsg
->length
+= qc
->pad_len
;
3514 DPRINTK("%d sg elements mapped\n", n_elem
);
3517 qc
->n_elem
= n_elem
;
3523 * swap_buf_le16 - swap halves of 16-bit words in place
3524 * @buf: Buffer to swap
3525 * @buf_words: Number of 16-bit words in buffer.
3527 * Swap halves of 16-bit words if needed to convert from
3528 * little-endian byte order to native cpu byte order, or
3532 * Inherited from caller.
3534 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3539 for (i
= 0; i
< buf_words
; i
++)
3540 buf
[i
] = le16_to_cpu(buf
[i
]);
3541 #endif /* __BIG_ENDIAN */
3545 * ata_mmio_data_xfer - Transfer data by MMIO
3546 * @adev: device for this I/O
3548 * @buflen: buffer length
3549 * @write_data: read/write
3551 * Transfer data from/to the device data register by MMIO.
3554 * Inherited from caller.
3557 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3558 unsigned int buflen
, int write_data
)
3560 struct ata_port
*ap
= adev
->ap
;
3562 unsigned int words
= buflen
>> 1;
3563 u16
*buf16
= (u16
*) buf
;
3564 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3566 /* Transfer multiple of 2 bytes */
3568 for (i
= 0; i
< words
; i
++)
3569 writew(le16_to_cpu(buf16
[i
]), mmio
);
3571 for (i
= 0; i
< words
; i
++)
3572 buf16
[i
] = cpu_to_le16(readw(mmio
));
3575 /* Transfer trailing 1 byte, if any. */
3576 if (unlikely(buflen
& 0x01)) {
3577 u16 align_buf
[1] = { 0 };
3578 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3581 memcpy(align_buf
, trailing_buf
, 1);
3582 writew(le16_to_cpu(align_buf
[0]), mmio
);
3584 align_buf
[0] = cpu_to_le16(readw(mmio
));
3585 memcpy(trailing_buf
, align_buf
, 1);
3591 * ata_pio_data_xfer - Transfer data by PIO
3592 * @adev: device to target
3594 * @buflen: buffer length
3595 * @write_data: read/write
3597 * Transfer data from/to the device data register by PIO.
3600 * Inherited from caller.
3603 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3604 unsigned int buflen
, int write_data
)
3606 struct ata_port
*ap
= adev
->ap
;
3607 unsigned int words
= buflen
>> 1;
3609 /* Transfer multiple of 2 bytes */
3611 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3613 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3615 /* Transfer trailing 1 byte, if any. */
3616 if (unlikely(buflen
& 0x01)) {
3617 u16 align_buf
[1] = { 0 };
3618 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3621 memcpy(align_buf
, trailing_buf
, 1);
3622 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3624 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3625 memcpy(trailing_buf
, align_buf
, 1);
3631 * ata_pio_data_xfer_noirq - Transfer data by PIO
3632 * @adev: device to target
3634 * @buflen: buffer length
3635 * @write_data: read/write
3637 * Transfer data from/to the device data register by PIO. Do the
3638 * transfer with interrupts disabled.
3641 * Inherited from caller.
3644 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3645 unsigned int buflen
, int write_data
)
3647 unsigned long flags
;
3648 local_irq_save(flags
);
3649 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3650 local_irq_restore(flags
);
3655 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3656 * @qc: Command on going
3658 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3661 * Inherited from caller.
3664 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3666 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3667 struct scatterlist
*sg
= qc
->__sg
;
3668 struct ata_port
*ap
= qc
->ap
;
3670 unsigned int offset
;
3673 if (qc
->cursect
== (qc
->nsect
- 1))
3674 ap
->hsm_task_state
= HSM_ST_LAST
;
3676 page
= sg
[qc
->cursg
].page
;
3677 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3679 /* get the current page and offset */
3680 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3681 offset
%= PAGE_SIZE
;
3683 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3685 if (PageHighMem(page
)) {
3686 unsigned long flags
;
3688 /* FIXME: use a bounce buffer */
3689 local_irq_save(flags
);
3690 buf
= kmap_atomic(page
, KM_IRQ0
);
3692 /* do the actual data transfer */
3693 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3695 kunmap_atomic(buf
, KM_IRQ0
);
3696 local_irq_restore(flags
);
3698 buf
= page_address(page
);
3699 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3705 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3712 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3713 * @qc: Command on going
3715 * Transfer one or many ATA_SECT_SIZE of data from/to the
3716 * ATA device for the DRQ request.
3719 * Inherited from caller.
3722 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3724 if (is_multi_taskfile(&qc
->tf
)) {
3725 /* READ/WRITE MULTIPLE */
3728 WARN_ON(qc
->dev
->multi_count
== 0);
3730 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3738 * atapi_send_cdb - Write CDB bytes to hardware
3739 * @ap: Port to which ATAPI device is attached.
3740 * @qc: Taskfile currently active
3742 * When device has indicated its readiness to accept
3743 * a CDB, this function is called. Send the CDB.
3749 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3752 DPRINTK("send cdb\n");
3753 WARN_ON(qc
->dev
->cdb_len
< 12);
3755 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3756 ata_altstatus(ap
); /* flush */
3758 switch (qc
->tf
.protocol
) {
3759 case ATA_PROT_ATAPI
:
3760 ap
->hsm_task_state
= HSM_ST
;
3762 case ATA_PROT_ATAPI_NODATA
:
3763 ap
->hsm_task_state
= HSM_ST_LAST
;
3765 case ATA_PROT_ATAPI_DMA
:
3766 ap
->hsm_task_state
= HSM_ST_LAST
;
3767 /* initiate bmdma */
3768 ap
->ops
->bmdma_start(qc
);
3774 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3775 * @qc: Command on going
3776 * @bytes: number of bytes
3778 * Transfer Transfer data from/to the ATAPI device.
3781 * Inherited from caller.
3785 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3787 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3788 struct scatterlist
*sg
= qc
->__sg
;
3789 struct ata_port
*ap
= qc
->ap
;
3792 unsigned int offset
, count
;
3794 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3795 ap
->hsm_task_state
= HSM_ST_LAST
;
3798 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3800 * The end of qc->sg is reached and the device expects
3801 * more data to transfer. In order not to overrun qc->sg
3802 * and fulfill length specified in the byte count register,
3803 * - for read case, discard trailing data from the device
3804 * - for write case, padding zero data to the device
3806 u16 pad_buf
[1] = { 0 };
3807 unsigned int words
= bytes
>> 1;
3810 if (words
) /* warning if bytes > 1 */
3811 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3812 "%u bytes trailing data\n", bytes
);
3814 for (i
= 0; i
< words
; i
++)
3815 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3817 ap
->hsm_task_state
= HSM_ST_LAST
;
3821 sg
= &qc
->__sg
[qc
->cursg
];
3824 offset
= sg
->offset
+ qc
->cursg_ofs
;
3826 /* get the current page and offset */
3827 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3828 offset
%= PAGE_SIZE
;
3830 /* don't overrun current sg */
3831 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3833 /* don't cross page boundaries */
3834 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3836 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3838 if (PageHighMem(page
)) {
3839 unsigned long flags
;
3841 /* FIXME: use bounce buffer */
3842 local_irq_save(flags
);
3843 buf
= kmap_atomic(page
, KM_IRQ0
);
3845 /* do the actual data transfer */
3846 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3848 kunmap_atomic(buf
, KM_IRQ0
);
3849 local_irq_restore(flags
);
3851 buf
= page_address(page
);
3852 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3856 qc
->curbytes
+= count
;
3857 qc
->cursg_ofs
+= count
;
3859 if (qc
->cursg_ofs
== sg
->length
) {
3869 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3870 * @qc: Command on going
3872 * Transfer Transfer data from/to the ATAPI device.
3875 * Inherited from caller.
3878 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3880 struct ata_port
*ap
= qc
->ap
;
3881 struct ata_device
*dev
= qc
->dev
;
3882 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3883 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3885 /* Abuse qc->result_tf for temp storage of intermediate TF
3886 * here to save some kernel stack usage.
3887 * For normal completion, qc->result_tf is not relevant. For
3888 * error, qc->result_tf is later overwritten by ata_qc_complete().
3889 * So, the correctness of qc->result_tf is not affected.
3891 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3892 ireason
= qc
->result_tf
.nsect
;
3893 bc_lo
= qc
->result_tf
.lbam
;
3894 bc_hi
= qc
->result_tf
.lbah
;
3895 bytes
= (bc_hi
<< 8) | bc_lo
;
3897 /* shall be cleared to zero, indicating xfer of data */
3898 if (ireason
& (1 << 0))
3901 /* make sure transfer direction matches expected */
3902 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3903 if (do_write
!= i_write
)
3906 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3908 __atapi_pio_bytes(qc
, bytes
);
3913 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3914 qc
->err_mask
|= AC_ERR_HSM
;
3915 ap
->hsm_task_state
= HSM_ST_ERR
;
3919 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3920 * @ap: the target ata_port
3924 * 1 if ok in workqueue, 0 otherwise.
3927 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3929 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3932 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3933 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3934 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3937 if (is_atapi_taskfile(&qc
->tf
) &&
3938 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3946 * ata_hsm_qc_complete - finish a qc running on standard HSM
3947 * @qc: Command to complete
3948 * @in_wq: 1 if called from workqueue, 0 otherwise
3950 * Finish @qc which is running on standard HSM.
3953 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3954 * Otherwise, none on entry and grabs host lock.
3956 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3958 struct ata_port
*ap
= qc
->ap
;
3959 unsigned long flags
;
3961 if (ap
->ops
->error_handler
) {
3963 spin_lock_irqsave(ap
->lock
, flags
);
3965 /* EH might have kicked in while host_set lock
3968 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3970 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3972 ata_qc_complete(qc
);
3974 ata_port_freeze(ap
);
3977 spin_unlock_irqrestore(ap
->lock
, flags
);
3979 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3980 ata_qc_complete(qc
);
3982 ata_port_freeze(ap
);
3986 spin_lock_irqsave(ap
->lock
, flags
);
3988 ata_qc_complete(qc
);
3989 spin_unlock_irqrestore(ap
->lock
, flags
);
3991 ata_qc_complete(qc
);
3994 ata_altstatus(ap
); /* flush */
3998 * ata_hsm_move - move the HSM to the next state.
3999 * @ap: the target ata_port
4001 * @status: current device status
4002 * @in_wq: 1 if called from workqueue, 0 otherwise
4005 * 1 when poll next status needed, 0 otherwise.
4007 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4008 u8 status
, int in_wq
)
4010 unsigned long flags
= 0;
4013 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4015 /* Make sure ata_qc_issue_prot() does not throw things
4016 * like DMA polling into the workqueue. Notice that
4017 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4019 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4022 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4023 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4025 switch (ap
->hsm_task_state
) {
4027 /* Send first data block or PACKET CDB */
4029 /* If polling, we will stay in the work queue after
4030 * sending the data. Otherwise, interrupt handler
4031 * takes over after sending the data.
4033 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4035 /* check device status */
4036 if (unlikely((status
& ATA_DRQ
) == 0)) {
4037 /* handle BSY=0, DRQ=0 as error */
4038 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4039 /* device stops HSM for abort/error */
4040 qc
->err_mask
|= AC_ERR_DEV
;
4042 /* HSM violation. Let EH handle this */
4043 qc
->err_mask
|= AC_ERR_HSM
;
4045 ap
->hsm_task_state
= HSM_ST_ERR
;
4049 /* Device should not ask for data transfer (DRQ=1)
4050 * when it finds something wrong.
4051 * We ignore DRQ here and stop the HSM by
4052 * changing hsm_task_state to HSM_ST_ERR and
4053 * let the EH abort the command or reset the device.
4055 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4056 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4058 qc
->err_mask
|= AC_ERR_HSM
;
4059 ap
->hsm_task_state
= HSM_ST_ERR
;
4063 /* Send the CDB (atapi) or the first data block (ata pio out).
4064 * During the state transition, interrupt handler shouldn't
4065 * be invoked before the data transfer is complete and
4066 * hsm_task_state is changed. Hence, the following locking.
4069 spin_lock_irqsave(ap
->lock
, flags
);
4071 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4072 /* PIO data out protocol.
4073 * send first data block.
4076 /* ata_pio_sectors() might change the state
4077 * to HSM_ST_LAST. so, the state is changed here
4078 * before ata_pio_sectors().
4080 ap
->hsm_task_state
= HSM_ST
;
4081 ata_pio_sectors(qc
);
4082 ata_altstatus(ap
); /* flush */
4085 atapi_send_cdb(ap
, qc
);
4088 spin_unlock_irqrestore(ap
->lock
, flags
);
4090 /* if polling, ata_pio_task() handles the rest.
4091 * otherwise, interrupt handler takes over from here.
4096 /* complete command or read/write the data register */
4097 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4098 /* ATAPI PIO protocol */
4099 if ((status
& ATA_DRQ
) == 0) {
4100 /* No more data to transfer or device error.
4101 * Device error will be tagged in HSM_ST_LAST.
4103 ap
->hsm_task_state
= HSM_ST_LAST
;
4107 /* Device should not ask for data transfer (DRQ=1)
4108 * when it finds something wrong.
4109 * We ignore DRQ here and stop the HSM by
4110 * changing hsm_task_state to HSM_ST_ERR and
4111 * let the EH abort the command or reset the device.
4113 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4114 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4116 qc
->err_mask
|= AC_ERR_HSM
;
4117 ap
->hsm_task_state
= HSM_ST_ERR
;
4121 atapi_pio_bytes(qc
);
4123 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4124 /* bad ireason reported by device */
4128 /* ATA PIO protocol */
4129 if (unlikely((status
& ATA_DRQ
) == 0)) {
4130 /* handle BSY=0, DRQ=0 as error */
4131 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4132 /* device stops HSM for abort/error */
4133 qc
->err_mask
|= AC_ERR_DEV
;
4135 /* HSM violation. Let EH handle this */
4136 qc
->err_mask
|= AC_ERR_HSM
;
4138 ap
->hsm_task_state
= HSM_ST_ERR
;
4142 /* For PIO reads, some devices may ask for
4143 * data transfer (DRQ=1) alone with ERR=1.
4144 * We respect DRQ here and transfer one
4145 * block of junk data before changing the
4146 * hsm_task_state to HSM_ST_ERR.
4148 * For PIO writes, ERR=1 DRQ=1 doesn't make
4149 * sense since the data block has been
4150 * transferred to the device.
4152 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4153 /* data might be corrputed */
4154 qc
->err_mask
|= AC_ERR_DEV
;
4156 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4157 ata_pio_sectors(qc
);
4159 status
= ata_wait_idle(ap
);
4162 if (status
& (ATA_BUSY
| ATA_DRQ
))
4163 qc
->err_mask
|= AC_ERR_HSM
;
4165 /* ata_pio_sectors() might change the
4166 * state to HSM_ST_LAST. so, the state
4167 * is changed after ata_pio_sectors().
4169 ap
->hsm_task_state
= HSM_ST_ERR
;
4173 ata_pio_sectors(qc
);
4175 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4176 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4179 status
= ata_wait_idle(ap
);
4184 ata_altstatus(ap
); /* flush */
4189 if (unlikely(!ata_ok(status
))) {
4190 qc
->err_mask
|= __ac_err_mask(status
);
4191 ap
->hsm_task_state
= HSM_ST_ERR
;
4195 /* no more data to transfer */
4196 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4197 ap
->id
, qc
->dev
->devno
, status
);
4199 WARN_ON(qc
->err_mask
);
4201 ap
->hsm_task_state
= HSM_ST_IDLE
;
4203 /* complete taskfile transaction */
4204 ata_hsm_qc_complete(qc
, in_wq
);
4210 /* make sure qc->err_mask is available to
4211 * know what's wrong and recover
4213 WARN_ON(qc
->err_mask
== 0);
4215 ap
->hsm_task_state
= HSM_ST_IDLE
;
4217 /* complete taskfile transaction */
4218 ata_hsm_qc_complete(qc
, in_wq
);
4230 static void ata_pio_task(void *_data
)
4232 struct ata_queued_cmd
*qc
= _data
;
4233 struct ata_port
*ap
= qc
->ap
;
4238 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4241 * This is purely heuristic. This is a fast path.
4242 * Sometimes when we enter, BSY will be cleared in
4243 * a chk-status or two. If not, the drive is probably seeking
4244 * or something. Snooze for a couple msecs, then
4245 * chk-status again. If still busy, queue delayed work.
4247 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4248 if (status
& ATA_BUSY
) {
4250 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4251 if (status
& ATA_BUSY
) {
4252 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4258 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4260 /* another command or interrupt handler
4261 * may be running at this point.
4268 * ata_qc_new - Request an available ATA command, for queueing
4269 * @ap: Port associated with device @dev
4270 * @dev: Device from whom we request an available command structure
4276 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4278 struct ata_queued_cmd
*qc
= NULL
;
4281 /* no command while frozen */
4282 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4285 /* the last tag is reserved for internal command. */
4286 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4287 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4288 qc
= __ata_qc_from_tag(ap
, i
);
4299 * ata_qc_new_init - Request an available ATA command, and initialize it
4300 * @dev: Device from whom we request an available command structure
4306 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4308 struct ata_port
*ap
= dev
->ap
;
4309 struct ata_queued_cmd
*qc
;
4311 qc
= ata_qc_new(ap
);
4324 * ata_qc_free - free unused ata_queued_cmd
4325 * @qc: Command to complete
4327 * Designed to free unused ata_queued_cmd object
4328 * in case something prevents using it.
4331 * spin_lock_irqsave(host_set lock)
4333 void ata_qc_free(struct ata_queued_cmd
*qc
)
4335 struct ata_port
*ap
= qc
->ap
;
4338 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4342 if (likely(ata_tag_valid(tag
))) {
4343 qc
->tag
= ATA_TAG_POISON
;
4344 clear_bit(tag
, &ap
->qc_allocated
);
4348 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4350 struct ata_port
*ap
= qc
->ap
;
4352 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4353 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4355 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4358 /* command should be marked inactive atomically with qc completion */
4359 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4360 ap
->sactive
&= ~(1 << qc
->tag
);
4362 ap
->active_tag
= ATA_TAG_POISON
;
4364 /* atapi: mark qc as inactive to prevent the interrupt handler
4365 * from completing the command twice later, before the error handler
4366 * is called. (when rc != 0 and atapi request sense is needed)
4368 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4369 ap
->qc_active
&= ~(1 << qc
->tag
);
4371 /* call completion callback */
4372 qc
->complete_fn(qc
);
4376 * ata_qc_complete - Complete an active ATA command
4377 * @qc: Command to complete
4378 * @err_mask: ATA Status register contents
4380 * Indicate to the mid and upper layers that an ATA
4381 * command has completed, with either an ok or not-ok status.
4384 * spin_lock_irqsave(host_set lock)
4386 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4388 struct ata_port
*ap
= qc
->ap
;
4390 /* XXX: New EH and old EH use different mechanisms to
4391 * synchronize EH with regular execution path.
4393 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4394 * Normal execution path is responsible for not accessing a
4395 * failed qc. libata core enforces the rule by returning NULL
4396 * from ata_qc_from_tag() for failed qcs.
4398 * Old EH depends on ata_qc_complete() nullifying completion
4399 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4400 * not synchronize with interrupt handler. Only PIO task is
4403 if (ap
->ops
->error_handler
) {
4404 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4406 if (unlikely(qc
->err_mask
))
4407 qc
->flags
|= ATA_QCFLAG_FAILED
;
4409 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4410 if (!ata_tag_internal(qc
->tag
)) {
4411 /* always fill result TF for failed qc */
4412 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4413 ata_qc_schedule_eh(qc
);
4418 /* read result TF if requested */
4419 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4420 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4422 __ata_qc_complete(qc
);
4424 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4427 /* read result TF if failed or requested */
4428 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4429 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4431 __ata_qc_complete(qc
);
4436 * ata_qc_complete_multiple - Complete multiple qcs successfully
4437 * @ap: port in question
4438 * @qc_active: new qc_active mask
4439 * @finish_qc: LLDD callback invoked before completing a qc
4441 * Complete in-flight commands. This functions is meant to be
4442 * called from low-level driver's interrupt routine to complete
4443 * requests normally. ap->qc_active and @qc_active is compared
4444 * and commands are completed accordingly.
4447 * spin_lock_irqsave(host_set lock)
4450 * Number of completed commands on success, -errno otherwise.
4452 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4453 void (*finish_qc
)(struct ata_queued_cmd
*))
4459 done_mask
= ap
->qc_active
^ qc_active
;
4461 if (unlikely(done_mask
& qc_active
)) {
4462 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4463 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4467 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4468 struct ata_queued_cmd
*qc
;
4470 if (!(done_mask
& (1 << i
)))
4473 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4476 ata_qc_complete(qc
);
4484 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4486 struct ata_port
*ap
= qc
->ap
;
4488 switch (qc
->tf
.protocol
) {
4491 case ATA_PROT_ATAPI_DMA
:
4494 case ATA_PROT_ATAPI
:
4496 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4509 * ata_qc_issue - issue taskfile to device
4510 * @qc: command to issue to device
4512 * Prepare an ATA command to submission to device.
4513 * This includes mapping the data into a DMA-able
4514 * area, filling in the S/G table, and finally
4515 * writing the taskfile to hardware, starting the command.
4518 * spin_lock_irqsave(host_set lock)
4520 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4522 struct ata_port
*ap
= qc
->ap
;
4524 /* Make sure only one non-NCQ command is outstanding. The
4525 * check is skipped for old EH because it reuses active qc to
4526 * request ATAPI sense.
4528 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4530 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4531 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4532 ap
->sactive
|= 1 << qc
->tag
;
4534 WARN_ON(ap
->sactive
);
4535 ap
->active_tag
= qc
->tag
;
4538 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4539 ap
->qc_active
|= 1 << qc
->tag
;
4541 if (ata_should_dma_map(qc
)) {
4542 if (qc
->flags
& ATA_QCFLAG_SG
) {
4543 if (ata_sg_setup(qc
))
4545 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4546 if (ata_sg_setup_one(qc
))
4550 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4553 ap
->ops
->qc_prep(qc
);
4555 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4556 if (unlikely(qc
->err_mask
))
4561 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4562 qc
->err_mask
|= AC_ERR_SYSTEM
;
4564 ata_qc_complete(qc
);
4568 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4569 * @qc: command to issue to device
4571 * Using various libata functions and hooks, this function
4572 * starts an ATA command. ATA commands are grouped into
4573 * classes called "protocols", and issuing each type of protocol
4574 * is slightly different.
4576 * May be used as the qc_issue() entry in ata_port_operations.
4579 * spin_lock_irqsave(host_set lock)
4582 * Zero on success, AC_ERR_* mask on failure
4585 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4587 struct ata_port
*ap
= qc
->ap
;
4589 /* Use polling pio if the LLD doesn't handle
4590 * interrupt driven pio and atapi CDB interrupt.
4592 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4593 switch (qc
->tf
.protocol
) {
4595 case ATA_PROT_ATAPI
:
4596 case ATA_PROT_ATAPI_NODATA
:
4597 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4599 case ATA_PROT_ATAPI_DMA
:
4600 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4601 /* see ata_dma_blacklisted() */
4609 /* select the device */
4610 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4612 /* start the command */
4613 switch (qc
->tf
.protocol
) {
4614 case ATA_PROT_NODATA
:
4615 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4616 ata_qc_set_polling(qc
);
4618 ata_tf_to_host(ap
, &qc
->tf
);
4619 ap
->hsm_task_state
= HSM_ST_LAST
;
4621 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4622 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4627 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4629 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4630 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4631 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4632 ap
->hsm_task_state
= HSM_ST_LAST
;
4636 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4637 ata_qc_set_polling(qc
);
4639 ata_tf_to_host(ap
, &qc
->tf
);
4641 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4642 /* PIO data out protocol */
4643 ap
->hsm_task_state
= HSM_ST_FIRST
;
4644 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4646 /* always send first data block using
4647 * the ata_pio_task() codepath.
4650 /* PIO data in protocol */
4651 ap
->hsm_task_state
= HSM_ST
;
4653 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4654 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4656 /* if polling, ata_pio_task() handles the rest.
4657 * otherwise, interrupt handler takes over from here.
4663 case ATA_PROT_ATAPI
:
4664 case ATA_PROT_ATAPI_NODATA
:
4665 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4666 ata_qc_set_polling(qc
);
4668 ata_tf_to_host(ap
, &qc
->tf
);
4670 ap
->hsm_task_state
= HSM_ST_FIRST
;
4672 /* send cdb by polling if no cdb interrupt */
4673 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4674 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4675 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4678 case ATA_PROT_ATAPI_DMA
:
4679 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4681 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4682 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4683 ap
->hsm_task_state
= HSM_ST_FIRST
;
4685 /* send cdb by polling if no cdb interrupt */
4686 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4687 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4692 return AC_ERR_SYSTEM
;
4699 * ata_host_intr - Handle host interrupt for given (port, task)
4700 * @ap: Port on which interrupt arrived (possibly...)
4701 * @qc: Taskfile currently active in engine
4703 * Handle host interrupt for given queued command. Currently,
4704 * only DMA interrupts are handled. All other commands are
4705 * handled via polling with interrupts disabled (nIEN bit).
4708 * spin_lock_irqsave(host_set lock)
4711 * One if interrupt was handled, zero if not (shared irq).
4714 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4715 struct ata_queued_cmd
*qc
)
4717 u8 status
, host_stat
= 0;
4719 VPRINTK("ata%u: protocol %d task_state %d\n",
4720 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4722 /* Check whether we are expecting interrupt in this state */
4723 switch (ap
->hsm_task_state
) {
4725 /* Some pre-ATAPI-4 devices assert INTRQ
4726 * at this state when ready to receive CDB.
4729 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4730 * The flag was turned on only for atapi devices.
4731 * No need to check is_atapi_taskfile(&qc->tf) again.
4733 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4737 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4738 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4739 /* check status of DMA engine */
4740 host_stat
= ap
->ops
->bmdma_status(ap
);
4741 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4743 /* if it's not our irq... */
4744 if (!(host_stat
& ATA_DMA_INTR
))
4747 /* before we do anything else, clear DMA-Start bit */
4748 ap
->ops
->bmdma_stop(qc
);
4750 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4751 /* error when transfering data to/from memory */
4752 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4753 ap
->hsm_task_state
= HSM_ST_ERR
;
4763 /* check altstatus */
4764 status
= ata_altstatus(ap
);
4765 if (status
& ATA_BUSY
)
4768 /* check main status, clearing INTRQ */
4769 status
= ata_chk_status(ap
);
4770 if (unlikely(status
& ATA_BUSY
))
4773 /* ack bmdma irq events */
4774 ap
->ops
->irq_clear(ap
);
4776 ata_hsm_move(ap
, qc
, status
, 0);
4777 return 1; /* irq handled */
4780 ap
->stats
.idle_irq
++;
4783 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4784 ata_irq_ack(ap
, 0); /* debug trap */
4785 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4789 return 0; /* irq not handled */
4793 * ata_interrupt - Default ATA host interrupt handler
4794 * @irq: irq line (unused)
4795 * @dev_instance: pointer to our ata_host_set information structure
4798 * Default interrupt handler for PCI IDE devices. Calls
4799 * ata_host_intr() for each port that is not disabled.
4802 * Obtains host_set lock during operation.
4805 * IRQ_NONE or IRQ_HANDLED.
4808 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4810 struct ata_host_set
*host_set
= dev_instance
;
4812 unsigned int handled
= 0;
4813 unsigned long flags
;
4815 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4816 spin_lock_irqsave(&host_set
->lock
, flags
);
4818 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4819 struct ata_port
*ap
;
4821 ap
= host_set
->ports
[i
];
4823 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4824 struct ata_queued_cmd
*qc
;
4826 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4827 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4828 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4829 handled
|= ata_host_intr(ap
, qc
);
4833 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4835 return IRQ_RETVAL(handled
);
4839 * sata_scr_valid - test whether SCRs are accessible
4840 * @ap: ATA port to test SCR accessibility for
4842 * Test whether SCRs are accessible for @ap.
4848 * 1 if SCRs are accessible, 0 otherwise.
4850 int sata_scr_valid(struct ata_port
*ap
)
4852 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4856 * sata_scr_read - read SCR register of the specified port
4857 * @ap: ATA port to read SCR for
4859 * @val: Place to store read value
4861 * Read SCR register @reg of @ap into *@val. This function is
4862 * guaranteed to succeed if the cable type of the port is SATA
4863 * and the port implements ->scr_read.
4869 * 0 on success, negative errno on failure.
4871 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4873 if (sata_scr_valid(ap
)) {
4874 *val
= ap
->ops
->scr_read(ap
, reg
);
4881 * sata_scr_write - write SCR register of the specified port
4882 * @ap: ATA port to write SCR for
4883 * @reg: SCR to write
4884 * @val: value to write
4886 * Write @val to SCR register @reg of @ap. This function is
4887 * guaranteed to succeed if the cable type of the port is SATA
4888 * and the port implements ->scr_read.
4894 * 0 on success, negative errno on failure.
4896 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4898 if (sata_scr_valid(ap
)) {
4899 ap
->ops
->scr_write(ap
, reg
, val
);
4906 * sata_scr_write_flush - write SCR register of the specified port and flush
4907 * @ap: ATA port to write SCR for
4908 * @reg: SCR to write
4909 * @val: value to write
4911 * This function is identical to sata_scr_write() except that this
4912 * function performs flush after writing to the register.
4918 * 0 on success, negative errno on failure.
4920 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4922 if (sata_scr_valid(ap
)) {
4923 ap
->ops
->scr_write(ap
, reg
, val
);
4924 ap
->ops
->scr_read(ap
, reg
);
4931 * ata_port_online - test whether the given port is online
4932 * @ap: ATA port to test
4934 * Test whether @ap is online. Note that this function returns 0
4935 * if online status of @ap cannot be obtained, so
4936 * ata_port_online(ap) != !ata_port_offline(ap).
4942 * 1 if the port online status is available and online.
4944 int ata_port_online(struct ata_port
*ap
)
4948 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4954 * ata_port_offline - test whether the given port is offline
4955 * @ap: ATA port to test
4957 * Test whether @ap is offline. Note that this function returns
4958 * 0 if offline status of @ap cannot be obtained, so
4959 * ata_port_online(ap) != !ata_port_offline(ap).
4965 * 1 if the port offline status is available and offline.
4967 int ata_port_offline(struct ata_port
*ap
)
4971 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4976 int ata_flush_cache(struct ata_device
*dev
)
4978 unsigned int err_mask
;
4981 if (!ata_try_flush_cache(dev
))
4984 if (ata_id_has_flush_ext(dev
->id
))
4985 cmd
= ATA_CMD_FLUSH_EXT
;
4987 cmd
= ATA_CMD_FLUSH
;
4989 err_mask
= ata_do_simple_cmd(dev
, cmd
);
4991 ata_dev_printk(dev
, KERN_ERR
, "failed to flush cache\n");
4998 static int ata_standby_drive(struct ata_device
*dev
)
5000 unsigned int err_mask
;
5002 err_mask
= ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
5004 ata_dev_printk(dev
, KERN_ERR
, "failed to standby drive "
5005 "(err_mask=0x%x)\n", err_mask
);
5012 static int ata_start_drive(struct ata_device
*dev
)
5014 unsigned int err_mask
;
5016 err_mask
= ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
5018 ata_dev_printk(dev
, KERN_ERR
, "failed to start drive "
5019 "(err_mask=0x%x)\n", err_mask
);
5027 * ata_device_resume - wakeup a previously suspended devices
5028 * @dev: the device to resume
5030 * Kick the drive back into action, by sending it an idle immediate
5031 * command and making sure its transfer mode matches between drive
5035 int ata_device_resume(struct ata_device
*dev
)
5037 struct ata_port
*ap
= dev
->ap
;
5039 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
5040 struct ata_device
*failed_dev
;
5042 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
5043 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
5045 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
5046 while (ata_set_mode(ap
, &failed_dev
))
5047 ata_dev_disable(failed_dev
);
5049 if (!ata_dev_enabled(dev
))
5051 if (dev
->class == ATA_DEV_ATA
)
5052 ata_start_drive(dev
);
5058 * ata_device_suspend - prepare a device for suspend
5059 * @dev: the device to suspend
5060 * @state: target power management state
5062 * Flush the cache on the drive, if appropriate, then issue a
5063 * standbynow command.
5065 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5067 struct ata_port
*ap
= dev
->ap
;
5069 if (!ata_dev_enabled(dev
))
5071 if (dev
->class == ATA_DEV_ATA
)
5072 ata_flush_cache(dev
);
5074 if (state
.event
!= PM_EVENT_FREEZE
)
5075 ata_standby_drive(dev
);
5076 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5081 * ata_port_start - Set port up for dma.
5082 * @ap: Port to initialize
5084 * Called just after data structures for each port are
5085 * initialized. Allocates space for PRD table.
5087 * May be used as the port_start() entry in ata_port_operations.
5090 * Inherited from caller.
5093 int ata_port_start (struct ata_port
*ap
)
5095 struct device
*dev
= ap
->dev
;
5098 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5102 rc
= ata_pad_alloc(ap
, dev
);
5104 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5108 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5115 * ata_port_stop - Undo ata_port_start()
5116 * @ap: Port to shut down
5118 * Frees the PRD table.
5120 * May be used as the port_stop() entry in ata_port_operations.
5123 * Inherited from caller.
5126 void ata_port_stop (struct ata_port
*ap
)
5128 struct device
*dev
= ap
->dev
;
5130 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5131 ata_pad_free(ap
, dev
);
5134 void ata_host_stop (struct ata_host_set
*host_set
)
5136 if (host_set
->mmio_base
)
5137 iounmap(host_set
->mmio_base
);
5142 * ata_host_remove - Unregister SCSI host structure with upper layers
5143 * @ap: Port to unregister
5144 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5147 * Inherited from caller.
5150 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5152 struct Scsi_Host
*sh
= ap
->host
;
5157 scsi_remove_host(sh
);
5159 ap
->ops
->port_stop(ap
);
5163 * ata_dev_init - Initialize an ata_device structure
5164 * @dev: Device structure to initialize
5166 * Initialize @dev in preparation for probing.
5169 * Inherited from caller.
5171 void ata_dev_init(struct ata_device
*dev
)
5173 struct ata_port
*ap
= dev
->ap
;
5174 unsigned long flags
;
5176 /* SATA spd limit is bound to the first device */
5177 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5179 /* High bits of dev->flags are used to record warm plug
5180 * requests which occur asynchronously. Synchronize using
5183 spin_lock_irqsave(ap
->lock
, flags
);
5184 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5185 spin_unlock_irqrestore(ap
->lock
, flags
);
5187 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5188 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5189 dev
->pio_mask
= UINT_MAX
;
5190 dev
->mwdma_mask
= UINT_MAX
;
5191 dev
->udma_mask
= UINT_MAX
;
5195 * ata_host_init - Initialize an ata_port structure
5196 * @ap: Structure to initialize
5197 * @host: associated SCSI mid-layer structure
5198 * @host_set: Collection of hosts to which @ap belongs
5199 * @ent: Probe information provided by low-level driver
5200 * @port_no: Port number associated with this ata_port
5202 * Initialize a new ata_port structure, and its associated
5206 * Inherited from caller.
5208 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5209 struct ata_host_set
*host_set
,
5210 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5216 host
->max_channel
= 1;
5217 host
->unique_id
= ata_unique_id
++;
5218 host
->max_cmd_len
= 12;
5220 ap
->lock
= &host_set
->lock
;
5221 ap
->flags
= ATA_FLAG_DISABLED
;
5222 ap
->id
= host
->unique_id
;
5224 ap
->ctl
= ATA_DEVCTL_OBS
;
5225 ap
->host_set
= host_set
;
5227 ap
->port_no
= port_no
;
5229 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5230 ap
->pio_mask
= ent
->pio_mask
;
5231 ap
->mwdma_mask
= ent
->mwdma_mask
;
5232 ap
->udma_mask
= ent
->udma_mask
;
5233 ap
->flags
|= ent
->host_flags
;
5234 ap
->ops
= ent
->port_ops
;
5235 ap
->hw_sata_spd_limit
= UINT_MAX
;
5236 ap
->active_tag
= ATA_TAG_POISON
;
5237 ap
->last_ctl
= 0xFF;
5239 #if defined(ATA_VERBOSE_DEBUG)
5240 /* turn on all debugging levels */
5241 ap
->msg_enable
= 0x00FF;
5242 #elif defined(ATA_DEBUG)
5243 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5245 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5248 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5249 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5250 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5251 INIT_LIST_HEAD(&ap
->eh_done_q
);
5252 init_waitqueue_head(&ap
->eh_wait_q
);
5254 /* set cable type */
5255 ap
->cbl
= ATA_CBL_NONE
;
5256 if (ap
->flags
& ATA_FLAG_SATA
)
5257 ap
->cbl
= ATA_CBL_SATA
;
5259 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5260 struct ata_device
*dev
= &ap
->device
[i
];
5267 ap
->stats
.unhandled_irq
= 1;
5268 ap
->stats
.idle_irq
= 1;
5271 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5275 * ata_host_add - Attach low-level ATA driver to system
5276 * @ent: Information provided by low-level driver
5277 * @host_set: Collections of ports to which we add
5278 * @port_no: Port number associated with this host
5280 * Attach low-level ATA driver to system.
5283 * PCI/etc. bus probe sem.
5286 * New ata_port on success, for NULL on error.
5289 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5290 struct ata_host_set
*host_set
,
5291 unsigned int port_no
)
5293 struct Scsi_Host
*host
;
5294 struct ata_port
*ap
;
5299 if (!ent
->port_ops
->error_handler
&&
5300 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5301 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5306 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5310 host
->transportt
= &ata_scsi_transport_template
;
5312 ap
= ata_shost_to_port(host
);
5314 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5316 rc
= ap
->ops
->port_start(ap
);
5323 scsi_host_put(host
);
5328 * ata_device_add - Register hardware device with ATA and SCSI layers
5329 * @ent: Probe information describing hardware device to be registered
5331 * This function processes the information provided in the probe
5332 * information struct @ent, allocates the necessary ATA and SCSI
5333 * host information structures, initializes them, and registers
5334 * everything with requisite kernel subsystems.
5336 * This function requests irqs, probes the ATA bus, and probes
5340 * PCI/etc. bus probe sem.
5343 * Number of ports registered. Zero on error (no ports registered).
5345 int ata_device_add(const struct ata_probe_ent
*ent
)
5347 unsigned int count
= 0, i
;
5348 struct device
*dev
= ent
->dev
;
5349 struct ata_host_set
*host_set
;
5353 /* alloc a container for our list of ATA ports (buses) */
5354 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5355 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5358 spin_lock_init(&host_set
->lock
);
5360 host_set
->dev
= dev
;
5361 host_set
->n_ports
= ent
->n_ports
;
5362 host_set
->irq
= ent
->irq
;
5363 host_set
->mmio_base
= ent
->mmio_base
;
5364 host_set
->private_data
= ent
->private_data
;
5365 host_set
->ops
= ent
->port_ops
;
5366 host_set
->flags
= ent
->host_set_flags
;
5368 /* register each port bound to this device */
5369 for (i
= 0; i
< ent
->n_ports
; i
++) {
5370 struct ata_port
*ap
;
5371 unsigned long xfer_mode_mask
;
5373 ap
= ata_host_add(ent
, host_set
, i
);
5377 host_set
->ports
[i
] = ap
;
5378 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5379 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5380 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5382 /* print per-port info to dmesg */
5383 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5384 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5385 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5386 ata_mode_string(xfer_mode_mask
),
5387 ap
->ioaddr
.cmd_addr
,
5388 ap
->ioaddr
.ctl_addr
,
5389 ap
->ioaddr
.bmdma_addr
,
5393 host_set
->ops
->irq_clear(ap
);
5394 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5401 /* obtain irq, that is shared between channels */
5402 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5403 DRV_NAME
, host_set
);
5405 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5410 /* perform each probe synchronously */
5411 DPRINTK("probe begin\n");
5412 for (i
= 0; i
< count
; i
++) {
5413 struct ata_port
*ap
;
5417 ap
= host_set
->ports
[i
];
5419 /* init sata_spd_limit to the current value */
5420 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5421 int spd
= (scontrol
>> 4) & 0xf;
5422 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5424 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5426 rc
= scsi_add_host(ap
->host
, dev
);
5428 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5429 /* FIXME: do something useful here */
5430 /* FIXME: handle unconditional calls to
5431 * scsi_scan_host and ata_host_remove, below,
5436 if (ap
->ops
->error_handler
) {
5437 unsigned long flags
;
5441 /* kick EH for boot probing */
5442 spin_lock_irqsave(ap
->lock
, flags
);
5444 ap
->eh_info
.probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5445 ap
->eh_info
.action
|= ATA_EH_SOFTRESET
;
5447 ap
->flags
|= ATA_FLAG_LOADING
;
5448 ata_port_schedule_eh(ap
);
5450 spin_unlock_irqrestore(ap
->lock
, flags
);
5452 /* wait for EH to finish */
5453 ata_port_wait_eh(ap
);
5455 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5456 rc
= ata_bus_probe(ap
);
5457 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5460 /* FIXME: do something useful here?
5461 * Current libata behavior will
5462 * tear down everything when
5463 * the module is removed
5464 * or the h/w is unplugged.
5470 /* probes are done, now scan each port's disk(s) */
5471 DPRINTK("host probe begin\n");
5472 for (i
= 0; i
< count
; i
++) {
5473 struct ata_port
*ap
= host_set
->ports
[i
];
5475 ata_scsi_scan_host(ap
);
5478 dev_set_drvdata(dev
, host_set
);
5480 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5481 return ent
->n_ports
; /* success */
5484 for (i
= 0; i
< count
; i
++) {
5485 ata_host_remove(host_set
->ports
[i
], 1);
5486 scsi_host_put(host_set
->ports
[i
]->host
);
5490 VPRINTK("EXIT, returning 0\n");
5495 * ata_port_detach - Detach ATA port in prepration of device removal
5496 * @ap: ATA port to be detached
5498 * Detach all ATA devices and the associated SCSI devices of @ap;
5499 * then, remove the associated SCSI host. @ap is guaranteed to
5500 * be quiescent on return from this function.
5503 * Kernel thread context (may sleep).
5505 void ata_port_detach(struct ata_port
*ap
)
5507 unsigned long flags
;
5510 if (!ap
->ops
->error_handler
)
5513 /* tell EH we're leaving & flush EH */
5514 spin_lock_irqsave(ap
->lock
, flags
);
5515 ap
->flags
|= ATA_FLAG_UNLOADING
;
5516 spin_unlock_irqrestore(ap
->lock
, flags
);
5518 ata_port_wait_eh(ap
);
5520 /* EH is now guaranteed to see UNLOADING, so no new device
5521 * will be attached. Disable all existing devices.
5523 spin_lock_irqsave(ap
->lock
, flags
);
5525 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5526 ata_dev_disable(&ap
->device
[i
]);
5528 spin_unlock_irqrestore(ap
->lock
, flags
);
5530 /* Final freeze & EH. All in-flight commands are aborted. EH
5531 * will be skipped and retrials will be terminated with bad
5534 spin_lock_irqsave(ap
->lock
, flags
);
5535 ata_port_freeze(ap
); /* won't be thawed */
5536 spin_unlock_irqrestore(ap
->lock
, flags
);
5538 ata_port_wait_eh(ap
);
5540 /* Flush hotplug task. The sequence is similar to
5541 * ata_port_flush_task().
5543 flush_workqueue(ata_aux_wq
);
5544 cancel_delayed_work(&ap
->hotplug_task
);
5545 flush_workqueue(ata_aux_wq
);
5547 /* remove the associated SCSI host */
5548 scsi_remove_host(ap
->host
);
5552 * ata_host_set_remove - PCI layer callback for device removal
5553 * @host_set: ATA host set that was removed
5555 * Unregister all objects associated with this host set. Free those
5559 * Inherited from calling layer (may sleep).
5562 void ata_host_set_remove(struct ata_host_set
*host_set
)
5566 for (i
= 0; i
< host_set
->n_ports
; i
++)
5567 ata_port_detach(host_set
->ports
[i
]);
5569 free_irq(host_set
->irq
, host_set
);
5571 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5572 struct ata_port
*ap
= host_set
->ports
[i
];
5574 ata_scsi_release(ap
->host
);
5576 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5577 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5579 if (ioaddr
->cmd_addr
== 0x1f0)
5580 release_region(0x1f0, 8);
5581 else if (ioaddr
->cmd_addr
== 0x170)
5582 release_region(0x170, 8);
5585 scsi_host_put(ap
->host
);
5588 if (host_set
->ops
->host_stop
)
5589 host_set
->ops
->host_stop(host_set
);
5595 * ata_scsi_release - SCSI layer callback hook for host unload
5596 * @host: libata host to be unloaded
5598 * Performs all duties necessary to shut down a libata port...
5599 * Kill port kthread, disable port, and release resources.
5602 * Inherited from SCSI layer.
5608 int ata_scsi_release(struct Scsi_Host
*host
)
5610 struct ata_port
*ap
= ata_shost_to_port(host
);
5614 ap
->ops
->port_disable(ap
);
5615 ata_host_remove(ap
, 0);
5622 * ata_std_ports - initialize ioaddr with standard port offsets.
5623 * @ioaddr: IO address structure to be initialized
5625 * Utility function which initializes data_addr, error_addr,
5626 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5627 * device_addr, status_addr, and command_addr to standard offsets
5628 * relative to cmd_addr.
5630 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5633 void ata_std_ports(struct ata_ioports
*ioaddr
)
5635 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5636 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5637 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5638 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5639 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5640 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5641 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5642 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5643 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5644 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5650 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5652 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5654 pci_iounmap(pdev
, host_set
->mmio_base
);
5658 * ata_pci_remove_one - PCI layer callback for device removal
5659 * @pdev: PCI device that was removed
5661 * PCI layer indicates to libata via this hook that
5662 * hot-unplug or module unload event has occurred.
5663 * Handle this by unregistering all objects associated
5664 * with this PCI device. Free those objects. Then finally
5665 * release PCI resources and disable device.
5668 * Inherited from PCI layer (may sleep).
5671 void ata_pci_remove_one (struct pci_dev
*pdev
)
5673 struct device
*dev
= pci_dev_to_dev(pdev
);
5674 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5675 struct ata_host_set
*host_set2
= host_set
->next
;
5677 ata_host_set_remove(host_set
);
5679 ata_host_set_remove(host_set2
);
5681 pci_release_regions(pdev
);
5682 pci_disable_device(pdev
);
5683 dev_set_drvdata(dev
, NULL
);
5686 /* move to PCI subsystem */
5687 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5689 unsigned long tmp
= 0;
5691 switch (bits
->width
) {
5694 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5700 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5706 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5717 return (tmp
== bits
->val
) ? 1 : 0;
5720 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5722 pci_save_state(pdev
);
5723 pci_disable_device(pdev
);
5724 pci_set_power_state(pdev
, PCI_D3hot
);
5728 int ata_pci_device_resume(struct pci_dev
*pdev
)
5730 pci_set_power_state(pdev
, PCI_D0
);
5731 pci_restore_state(pdev
);
5732 pci_enable_device(pdev
);
5733 pci_set_master(pdev
);
5736 #endif /* CONFIG_PCI */
5739 static int __init
ata_init(void)
5741 ata_wq
= create_workqueue("ata");
5745 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5747 destroy_workqueue(ata_wq
);
5751 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5755 static void __exit
ata_exit(void)
5757 destroy_workqueue(ata_wq
);
5758 destroy_workqueue(ata_aux_wq
);
5761 module_init(ata_init
);
5762 module_exit(ata_exit
);
5764 static unsigned long ratelimit_time
;
5765 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5767 int ata_ratelimit(void)
5770 unsigned long flags
;
5772 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5774 if (time_after(jiffies
, ratelimit_time
)) {
5776 ratelimit_time
= jiffies
+ (HZ
/5);
5780 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5786 * ata_wait_register - wait until register value changes
5787 * @reg: IO-mapped register
5788 * @mask: Mask to apply to read register value
5789 * @val: Wait condition
5790 * @interval_msec: polling interval in milliseconds
5791 * @timeout_msec: timeout in milliseconds
5793 * Waiting for some bits of register to change is a common
5794 * operation for ATA controllers. This function reads 32bit LE
5795 * IO-mapped register @reg and tests for the following condition.
5797 * (*@reg & mask) != val
5799 * If the condition is met, it returns; otherwise, the process is
5800 * repeated after @interval_msec until timeout.
5803 * Kernel thread context (may sleep)
5806 * The final register value.
5808 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5809 unsigned long interval_msec
,
5810 unsigned long timeout_msec
)
5812 unsigned long timeout
;
5815 tmp
= ioread32(reg
);
5817 /* Calculate timeout _after_ the first read to make sure
5818 * preceding writes reach the controller before starting to
5819 * eat away the timeout.
5821 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5823 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5824 msleep(interval_msec
);
5825 tmp
= ioread32(reg
);
5832 * libata is essentially a library of internal helper functions for
5833 * low-level ATA host controller drivers. As such, the API/ABI is
5834 * likely to change as new drivers are added and updated.
5835 * Do not depend on ABI/API stability.
5838 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5839 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5840 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5841 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5842 EXPORT_SYMBOL_GPL(ata_std_ports
);
5843 EXPORT_SYMBOL_GPL(ata_device_add
);
5844 EXPORT_SYMBOL_GPL(ata_port_detach
);
5845 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5846 EXPORT_SYMBOL_GPL(ata_sg_init
);
5847 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5848 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5849 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5850 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5851 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5852 EXPORT_SYMBOL_GPL(ata_tf_load
);
5853 EXPORT_SYMBOL_GPL(ata_tf_read
);
5854 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5855 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5856 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5857 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5858 EXPORT_SYMBOL_GPL(ata_check_status
);
5859 EXPORT_SYMBOL_GPL(ata_altstatus
);
5860 EXPORT_SYMBOL_GPL(ata_exec_command
);
5861 EXPORT_SYMBOL_GPL(ata_port_start
);
5862 EXPORT_SYMBOL_GPL(ata_port_stop
);
5863 EXPORT_SYMBOL_GPL(ata_host_stop
);
5864 EXPORT_SYMBOL_GPL(ata_interrupt
);
5865 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5866 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5867 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5868 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5869 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5870 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5871 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5872 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5873 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5874 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5875 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5876 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5877 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5878 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5879 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5880 EXPORT_SYMBOL_GPL(ata_port_probe
);
5881 EXPORT_SYMBOL_GPL(sata_set_spd
);
5882 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5883 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5884 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5885 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5886 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5887 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5888 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5889 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5890 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5891 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5892 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5893 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5894 EXPORT_SYMBOL_GPL(ata_port_disable
);
5895 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5896 EXPORT_SYMBOL_GPL(ata_wait_register
);
5897 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5898 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5899 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5900 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5901 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5902 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5903 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5904 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5905 EXPORT_SYMBOL_GPL(ata_host_intr
);
5906 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5907 EXPORT_SYMBOL_GPL(sata_scr_read
);
5908 EXPORT_SYMBOL_GPL(sata_scr_write
);
5909 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5910 EXPORT_SYMBOL_GPL(ata_port_online
);
5911 EXPORT_SYMBOL_GPL(ata_port_offline
);
5912 EXPORT_SYMBOL_GPL(ata_id_string
);
5913 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5914 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5916 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5917 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5918 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5921 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5922 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5923 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5924 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5925 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5926 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5927 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5928 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5929 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5930 #endif /* CONFIG_PCI */
5932 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5933 EXPORT_SYMBOL_GPL(ata_device_resume
);
5934 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5935 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5937 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5938 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5939 EXPORT_SYMBOL_GPL(ata_port_abort
);
5940 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5941 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5942 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5943 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5944 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5945 EXPORT_SYMBOL_GPL(ata_do_eh
);