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 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
1136 * without filling any other registers
1138 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1140 struct ata_taskfile tf
;
1143 ata_tf_init(dev
, &tf
);
1146 tf
.flags
|= ATA_TFLAG_DEVICE
;
1147 tf
.protocol
= ATA_PROT_NODATA
;
1149 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1151 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
1158 * ata_pio_need_iordy - check if iordy needed
1161 * Check if the current speed of the device requires IORDY. Used
1162 * by various controllers for chip configuration.
1165 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1168 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1175 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1177 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1178 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1179 /* Is the speed faster than the drive allows non IORDY ? */
1181 /* This is cycle times not frequency - watch the logic! */
1182 if (pio
> 240) /* PIO2 is 240nS per cycle */
1191 * ata_dev_read_id - Read ID data from the specified device
1192 * @dev: target device
1193 * @p_class: pointer to class of the target device (may be changed)
1194 * @post_reset: is this read ID post-reset?
1195 * @id: buffer to read IDENTIFY data into
1197 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1198 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1199 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1200 * for pre-ATA4 drives.
1203 * Kernel thread context (may sleep)
1206 * 0 on success, -errno otherwise.
1208 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1209 int post_reset
, u16
*id
)
1211 struct ata_port
*ap
= dev
->ap
;
1212 unsigned int class = *p_class
;
1213 struct ata_taskfile tf
;
1214 unsigned int err_mask
= 0;
1218 if (ata_msg_ctl(ap
))
1219 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1220 __FUNCTION__
, ap
->id
, dev
->devno
);
1222 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1225 ata_tf_init(dev
, &tf
);
1229 tf
.command
= ATA_CMD_ID_ATA
;
1232 tf
.command
= ATA_CMD_ID_ATAPI
;
1236 reason
= "unsupported class";
1240 tf
.protocol
= ATA_PROT_PIO
;
1242 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1243 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1246 reason
= "I/O error";
1250 swap_buf_le16(id
, ATA_ID_WORDS
);
1253 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1255 reason
= "device reports illegal type";
1259 if (post_reset
&& class == ATA_DEV_ATA
) {
1261 * The exact sequence expected by certain pre-ATA4 drives is:
1264 * INITIALIZE DEVICE PARAMETERS
1266 * Some drives were very specific about that exact sequence.
1268 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1269 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1272 reason
= "INIT_DEV_PARAMS failed";
1276 /* current CHS translation info (id[53-58]) might be
1277 * changed. reread the identify device info.
1289 if (ata_msg_warn(ap
))
1290 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1291 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1295 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1297 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1300 static void ata_dev_config_ncq(struct ata_device
*dev
,
1301 char *desc
, size_t desc_sz
)
1303 struct ata_port
*ap
= dev
->ap
;
1304 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1306 if (!ata_id_has_ncq(dev
->id
)) {
1311 if (ap
->flags
& ATA_FLAG_NCQ
) {
1312 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1313 dev
->flags
|= ATA_DFLAG_NCQ
;
1316 if (hdepth
>= ddepth
)
1317 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1319 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1323 * ata_dev_configure - Configure the specified ATA/ATAPI device
1324 * @dev: Target device to configure
1325 * @print_info: Enable device info printout
1327 * Configure @dev according to @dev->id. Generic and low-level
1328 * driver specific fixups are also applied.
1331 * Kernel thread context (may sleep)
1334 * 0 on success, -errno otherwise
1336 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1338 struct ata_port
*ap
= dev
->ap
;
1339 const u16
*id
= dev
->id
;
1340 unsigned int xfer_mask
;
1343 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1344 ata_dev_printk(dev
, KERN_INFO
, "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1345 __FUNCTION__
, ap
->id
, dev
->devno
);
1349 if (ata_msg_probe(ap
))
1350 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1351 __FUNCTION__
, ap
->id
, dev
->devno
);
1353 /* print device capabilities */
1354 if (ata_msg_probe(ap
))
1355 ata_dev_printk(dev
, KERN_DEBUG
, "%s: cfg 49:%04x 82:%04x 83:%04x "
1356 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1358 id
[49], id
[82], id
[83], id
[84],
1359 id
[85], id
[86], id
[87], id
[88]);
1361 /* initialize to-be-configured parameters */
1362 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1363 dev
->max_sectors
= 0;
1371 * common ATA, ATAPI feature tests
1374 /* find max transfer mode; for printk only */
1375 xfer_mask
= ata_id_xfermask(id
);
1377 if (ata_msg_probe(ap
))
1380 /* ATA-specific feature tests */
1381 if (dev
->class == ATA_DEV_ATA
) {
1382 dev
->n_sectors
= ata_id_n_sectors(id
);
1384 if (ata_id_has_lba(id
)) {
1385 const char *lba_desc
;
1389 dev
->flags
|= ATA_DFLAG_LBA
;
1390 if (ata_id_has_lba48(id
)) {
1391 dev
->flags
|= ATA_DFLAG_LBA48
;
1396 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1398 /* print device info to dmesg */
1399 if (ata_msg_info(ap
))
1400 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1401 "max %s, %Lu sectors: %s %s\n",
1402 ata_id_major_version(id
),
1403 ata_mode_string(xfer_mask
),
1404 (unsigned long long)dev
->n_sectors
,
1405 lba_desc
, ncq_desc
);
1409 /* Default translation */
1410 dev
->cylinders
= id
[1];
1412 dev
->sectors
= id
[6];
1414 if (ata_id_current_chs_valid(id
)) {
1415 /* Current CHS translation is valid. */
1416 dev
->cylinders
= id
[54];
1417 dev
->heads
= id
[55];
1418 dev
->sectors
= id
[56];
1421 /* print device info to dmesg */
1422 if (ata_msg_info(ap
))
1423 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1424 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1425 ata_id_major_version(id
),
1426 ata_mode_string(xfer_mask
),
1427 (unsigned long long)dev
->n_sectors
,
1428 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1431 if (dev
->id
[59] & 0x100) {
1432 dev
->multi_count
= dev
->id
[59] & 0xff;
1433 if (ata_msg_info(ap
))
1434 ata_dev_printk(dev
, KERN_INFO
, "ata%u: dev %u multi count %u\n",
1435 ap
->id
, dev
->devno
, dev
->multi_count
);
1441 /* ATAPI-specific feature tests */
1442 else if (dev
->class == ATA_DEV_ATAPI
) {
1443 char *cdb_intr_string
= "";
1445 rc
= atapi_cdb_len(id
);
1446 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1447 if (ata_msg_warn(ap
))
1448 ata_dev_printk(dev
, KERN_WARNING
,
1449 "unsupported CDB len\n");
1453 dev
->cdb_len
= (unsigned int) rc
;
1455 if (ata_id_cdb_intr(dev
->id
)) {
1456 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1457 cdb_intr_string
= ", CDB intr";
1460 /* print device info to dmesg */
1461 if (ata_msg_info(ap
))
1462 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1463 ata_mode_string(xfer_mask
),
1467 ap
->host
->max_cmd_len
= 0;
1468 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1469 ap
->host
->max_cmd_len
= max_t(unsigned int,
1470 ap
->host
->max_cmd_len
,
1471 ap
->device
[i
].cdb_len
);
1473 /* limit bridge transfers to udma5, 200 sectors */
1474 if (ata_dev_knobble(dev
)) {
1475 if (ata_msg_info(ap
))
1476 ata_dev_printk(dev
, KERN_INFO
,
1477 "applying bridge limits\n");
1478 dev
->udma_mask
&= ATA_UDMA5
;
1479 dev
->max_sectors
= ATA_MAX_SECTORS
;
1482 if (ap
->ops
->dev_config
)
1483 ap
->ops
->dev_config(ap
, dev
);
1485 if (ata_msg_probe(ap
))
1486 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1487 __FUNCTION__
, ata_chk_status(ap
));
1491 if (ata_msg_probe(ap
))
1492 ata_dev_printk(dev
, KERN_DEBUG
,
1493 "%s: EXIT, err\n", __FUNCTION__
);
1498 * ata_bus_probe - Reset and probe ATA bus
1501 * Master ATA bus probing function. Initiates a hardware-dependent
1502 * bus reset, then attempts to identify any devices found on
1506 * PCI/etc. bus probe sem.
1509 * Zero on success, negative errno otherwise.
1512 static int ata_bus_probe(struct ata_port
*ap
)
1514 unsigned int classes
[ATA_MAX_DEVICES
];
1515 int tries
[ATA_MAX_DEVICES
];
1516 int i
, rc
, down_xfermask
;
1517 struct ata_device
*dev
;
1521 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1522 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1527 /* reset and determine device classes */
1528 ap
->ops
->phy_reset(ap
);
1530 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1531 dev
= &ap
->device
[i
];
1533 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1534 dev
->class != ATA_DEV_UNKNOWN
)
1535 classes
[dev
->devno
] = dev
->class;
1537 classes
[dev
->devno
] = ATA_DEV_NONE
;
1539 dev
->class = ATA_DEV_UNKNOWN
;
1544 /* after the reset the device state is PIO 0 and the controller
1545 state is undefined. Record the mode */
1547 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1548 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1550 /* read IDENTIFY page and configure devices */
1551 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1552 dev
= &ap
->device
[i
];
1555 dev
->class = classes
[i
];
1557 if (!ata_dev_enabled(dev
))
1560 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1564 rc
= ata_dev_configure(dev
, 1);
1569 /* configure transfer mode */
1570 rc
= ata_set_mode(ap
, &dev
);
1576 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1577 if (ata_dev_enabled(&ap
->device
[i
]))
1580 /* no device present, disable port */
1581 ata_port_disable(ap
);
1582 ap
->ops
->port_disable(ap
);
1589 tries
[dev
->devno
] = 0;
1592 sata_down_spd_limit(ap
);
1595 tries
[dev
->devno
]--;
1596 if (down_xfermask
&&
1597 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1598 tries
[dev
->devno
] = 0;
1601 if (!tries
[dev
->devno
]) {
1602 ata_down_xfermask_limit(dev
, 1);
1603 ata_dev_disable(dev
);
1610 * ata_port_probe - Mark port as enabled
1611 * @ap: Port for which we indicate enablement
1613 * Modify @ap data structure such that the system
1614 * thinks that the entire port is enabled.
1616 * LOCKING: host_set lock, or some other form of
1620 void ata_port_probe(struct ata_port
*ap
)
1622 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1626 * sata_print_link_status - Print SATA link status
1627 * @ap: SATA port to printk link status about
1629 * This function prints link speed and status of a SATA link.
1634 static void sata_print_link_status(struct ata_port
*ap
)
1636 u32 sstatus
, scontrol
, tmp
;
1638 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1640 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1642 if (ata_port_online(ap
)) {
1643 tmp
= (sstatus
>> 4) & 0xf;
1644 ata_port_printk(ap
, KERN_INFO
,
1645 "SATA link up %s (SStatus %X SControl %X)\n",
1646 sata_spd_string(tmp
), sstatus
, scontrol
);
1648 ata_port_printk(ap
, KERN_INFO
,
1649 "SATA link down (SStatus %X SControl %X)\n",
1655 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1656 * @ap: SATA port associated with target SATA PHY.
1658 * This function issues commands to standard SATA Sxxx
1659 * PHY registers, to wake up the phy (and device), and
1660 * clear any reset condition.
1663 * PCI/etc. bus probe sem.
1666 void __sata_phy_reset(struct ata_port
*ap
)
1669 unsigned long timeout
= jiffies
+ (HZ
* 5);
1671 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1672 /* issue phy wake/reset */
1673 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1674 /* Couldn't find anything in SATA I/II specs, but
1675 * AHCI-1.1 10.4.2 says at least 1 ms. */
1678 /* phy wake/clear reset */
1679 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1681 /* wait for phy to become ready, if necessary */
1684 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1685 if ((sstatus
& 0xf) != 1)
1687 } while (time_before(jiffies
, timeout
));
1689 /* print link status */
1690 sata_print_link_status(ap
);
1692 /* TODO: phy layer with polling, timeouts, etc. */
1693 if (!ata_port_offline(ap
))
1696 ata_port_disable(ap
);
1698 if (ap
->flags
& ATA_FLAG_DISABLED
)
1701 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1702 ata_port_disable(ap
);
1706 ap
->cbl
= ATA_CBL_SATA
;
1710 * sata_phy_reset - Reset SATA bus.
1711 * @ap: SATA port associated with target SATA PHY.
1713 * This function resets the SATA bus, and then probes
1714 * the bus for devices.
1717 * PCI/etc. bus probe sem.
1720 void sata_phy_reset(struct ata_port
*ap
)
1722 __sata_phy_reset(ap
);
1723 if (ap
->flags
& ATA_FLAG_DISABLED
)
1729 * ata_dev_pair - return other device on cable
1732 * Obtain the other device on the same cable, or if none is
1733 * present NULL is returned
1736 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1738 struct ata_port
*ap
= adev
->ap
;
1739 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1740 if (!ata_dev_enabled(pair
))
1746 * ata_port_disable - Disable port.
1747 * @ap: Port to be disabled.
1749 * Modify @ap data structure such that the system
1750 * thinks that the entire port is disabled, and should
1751 * never attempt to probe or communicate with devices
1754 * LOCKING: host_set lock, or some other form of
1758 void ata_port_disable(struct ata_port
*ap
)
1760 ap
->device
[0].class = ATA_DEV_NONE
;
1761 ap
->device
[1].class = ATA_DEV_NONE
;
1762 ap
->flags
|= ATA_FLAG_DISABLED
;
1766 * sata_down_spd_limit - adjust SATA spd limit downward
1767 * @ap: Port to adjust SATA spd limit for
1769 * Adjust SATA spd limit of @ap downward. Note that this
1770 * function only adjusts the limit. The change must be applied
1771 * using sata_set_spd().
1774 * Inherited from caller.
1777 * 0 on success, negative errno on failure
1779 int sata_down_spd_limit(struct ata_port
*ap
)
1781 u32 sstatus
, spd
, mask
;
1784 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1788 mask
= ap
->sata_spd_limit
;
1791 highbit
= fls(mask
) - 1;
1792 mask
&= ~(1 << highbit
);
1794 spd
= (sstatus
>> 4) & 0xf;
1798 mask
&= (1 << spd
) - 1;
1802 ap
->sata_spd_limit
= mask
;
1804 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1805 sata_spd_string(fls(mask
)));
1810 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1814 if (ap
->sata_spd_limit
== UINT_MAX
)
1817 limit
= fls(ap
->sata_spd_limit
);
1819 spd
= (*scontrol
>> 4) & 0xf;
1820 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1822 return spd
!= limit
;
1826 * sata_set_spd_needed - is SATA spd configuration needed
1827 * @ap: Port in question
1829 * Test whether the spd limit in SControl matches
1830 * @ap->sata_spd_limit. This function is used to determine
1831 * whether hardreset is necessary to apply SATA spd
1835 * Inherited from caller.
1838 * 1 if SATA spd configuration is needed, 0 otherwise.
1840 int sata_set_spd_needed(struct ata_port
*ap
)
1844 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1847 return __sata_set_spd_needed(ap
, &scontrol
);
1851 * sata_set_spd - set SATA spd according to spd limit
1852 * @ap: Port to set SATA spd for
1854 * Set SATA spd of @ap according to sata_spd_limit.
1857 * Inherited from caller.
1860 * 0 if spd doesn't need to be changed, 1 if spd has been
1861 * changed. Negative errno if SCR registers are inaccessible.
1863 int sata_set_spd(struct ata_port
*ap
)
1868 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1871 if (!__sata_set_spd_needed(ap
, &scontrol
))
1874 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1881 * This mode timing computation functionality is ported over from
1882 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1885 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1886 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1887 * for PIO 5, which is a nonstandard extension and UDMA6, which
1888 * is currently supported only by Maxtor drives.
1891 static const struct ata_timing ata_timing
[] = {
1893 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1894 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1895 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1896 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1898 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1899 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1900 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1902 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1904 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1905 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1906 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1908 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1909 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1910 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1912 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1913 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1914 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1916 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1917 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1918 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1920 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1925 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1926 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1928 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1930 q
->setup
= EZ(t
->setup
* 1000, T
);
1931 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1932 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1933 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1934 q
->active
= EZ(t
->active
* 1000, T
);
1935 q
->recover
= EZ(t
->recover
* 1000, T
);
1936 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1937 q
->udma
= EZ(t
->udma
* 1000, UT
);
1940 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1941 struct ata_timing
*m
, unsigned int what
)
1943 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1944 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1945 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1946 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1947 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1948 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1949 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1950 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1953 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1955 const struct ata_timing
*t
;
1957 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1958 if (t
->mode
== 0xFF)
1963 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1964 struct ata_timing
*t
, int T
, int UT
)
1966 const struct ata_timing
*s
;
1967 struct ata_timing p
;
1973 if (!(s
= ata_timing_find_mode(speed
)))
1976 memcpy(t
, s
, sizeof(*s
));
1979 * If the drive is an EIDE drive, it can tell us it needs extended
1980 * PIO/MW_DMA cycle timing.
1983 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1984 memset(&p
, 0, sizeof(p
));
1985 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1986 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1987 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1988 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1989 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1991 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1995 * Convert the timing to bus clock counts.
1998 ata_timing_quantize(t
, t
, T
, UT
);
2001 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2002 * S.M.A.R.T * and some other commands. We have to ensure that the
2003 * DMA cycle timing is slower/equal than the fastest PIO timing.
2006 if (speed
> XFER_PIO_4
) {
2007 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2008 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2012 * Lengthen active & recovery time so that cycle time is correct.
2015 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2016 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2017 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2020 if (t
->active
+ t
->recover
< t
->cycle
) {
2021 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2022 t
->recover
= t
->cycle
- t
->active
;
2029 * ata_down_xfermask_limit - adjust dev xfer masks downward
2030 * @dev: Device to adjust xfer masks
2031 * @force_pio0: Force PIO0
2033 * Adjust xfer masks of @dev downward. Note that this function
2034 * does not apply the change. Invoking ata_set_mode() afterwards
2035 * will apply the limit.
2038 * Inherited from caller.
2041 * 0 on success, negative errno on failure
2043 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2045 unsigned long xfer_mask
;
2048 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2053 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2054 if (xfer_mask
& ATA_MASK_UDMA
)
2055 xfer_mask
&= ~ATA_MASK_MWDMA
;
2057 highbit
= fls(xfer_mask
) - 1;
2058 xfer_mask
&= ~(1 << highbit
);
2060 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2064 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2067 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2068 ata_mode_string(xfer_mask
));
2076 static int ata_dev_set_mode(struct ata_device
*dev
)
2078 unsigned int err_mask
;
2081 dev
->flags
&= ~ATA_DFLAG_PIO
;
2082 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2083 dev
->flags
|= ATA_DFLAG_PIO
;
2085 err_mask
= ata_dev_set_xfermode(dev
);
2087 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2088 "(err_mask=0x%x)\n", err_mask
);
2092 rc
= ata_dev_revalidate(dev
, 0);
2096 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2097 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2099 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2100 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2105 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2106 * @ap: port on which timings will be programmed
2107 * @r_failed_dev: out paramter for failed device
2109 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2110 * ata_set_mode() fails, pointer to the failing device is
2111 * returned in @r_failed_dev.
2114 * PCI/etc. bus probe sem.
2117 * 0 on success, negative errno otherwise
2119 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2121 struct ata_device
*dev
;
2122 int i
, rc
= 0, used_dma
= 0, found
= 0;
2124 /* has private set_mode? */
2125 if (ap
->ops
->set_mode
) {
2126 /* FIXME: make ->set_mode handle no device case and
2127 * return error code and failing device on failure.
2129 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2130 if (ata_dev_enabled(&ap
->device
[i
])) {
2131 ap
->ops
->set_mode(ap
);
2138 /* step 1: calculate xfer_mask */
2139 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2140 unsigned int pio_mask
, dma_mask
;
2142 dev
= &ap
->device
[i
];
2144 if (!ata_dev_enabled(dev
))
2147 ata_dev_xfermask(dev
);
2149 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2150 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2151 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2152 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2161 /* step 2: always set host PIO timings */
2162 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2163 dev
= &ap
->device
[i
];
2164 if (!ata_dev_enabled(dev
))
2167 if (!dev
->pio_mode
) {
2168 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2173 dev
->xfer_mode
= dev
->pio_mode
;
2174 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2175 if (ap
->ops
->set_piomode
)
2176 ap
->ops
->set_piomode(ap
, dev
);
2179 /* step 3: set host DMA timings */
2180 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2181 dev
= &ap
->device
[i
];
2183 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2186 dev
->xfer_mode
= dev
->dma_mode
;
2187 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2188 if (ap
->ops
->set_dmamode
)
2189 ap
->ops
->set_dmamode(ap
, dev
);
2192 /* step 4: update devices' xfer mode */
2193 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2194 dev
= &ap
->device
[i
];
2196 if (!ata_dev_enabled(dev
))
2199 rc
= ata_dev_set_mode(dev
);
2204 /* Record simplex status. If we selected DMA then the other
2205 * host channels are not permitted to do so.
2207 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2208 ap
->host_set
->simplex_claimed
= 1;
2210 /* step5: chip specific finalisation */
2211 if (ap
->ops
->post_set_mode
)
2212 ap
->ops
->post_set_mode(ap
);
2216 *r_failed_dev
= dev
;
2221 * ata_tf_to_host - issue ATA taskfile to host controller
2222 * @ap: port to which command is being issued
2223 * @tf: ATA taskfile register set
2225 * Issues ATA taskfile register set to ATA host controller,
2226 * with proper synchronization with interrupt handler and
2230 * spin_lock_irqsave(host_set lock)
2233 static inline void ata_tf_to_host(struct ata_port
*ap
,
2234 const struct ata_taskfile
*tf
)
2236 ap
->ops
->tf_load(ap
, tf
);
2237 ap
->ops
->exec_command(ap
, tf
);
2241 * ata_busy_sleep - sleep until BSY clears, or timeout
2242 * @ap: port containing status register to be polled
2243 * @tmout_pat: impatience timeout
2244 * @tmout: overall timeout
2246 * Sleep until ATA Status register bit BSY clears,
2247 * or a timeout occurs.
2252 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2253 unsigned long tmout_pat
, unsigned long tmout
)
2255 unsigned long timer_start
, timeout
;
2258 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2259 timer_start
= jiffies
;
2260 timeout
= timer_start
+ tmout_pat
;
2261 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2263 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2266 if (status
& ATA_BUSY
)
2267 ata_port_printk(ap
, KERN_WARNING
,
2268 "port is slow to respond, please be patient\n");
2270 timeout
= timer_start
+ tmout
;
2271 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2273 status
= ata_chk_status(ap
);
2276 if (status
& ATA_BUSY
) {
2277 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2278 "(%lu secs)\n", tmout
/ HZ
);
2285 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2287 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2288 unsigned int dev0
= devmask
& (1 << 0);
2289 unsigned int dev1
= devmask
& (1 << 1);
2290 unsigned long timeout
;
2292 /* if device 0 was found in ata_devchk, wait for its
2296 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2298 /* if device 1 was found in ata_devchk, wait for
2299 * register access, then wait for BSY to clear
2301 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2305 ap
->ops
->dev_select(ap
, 1);
2306 if (ap
->flags
& ATA_FLAG_MMIO
) {
2307 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2308 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2310 nsect
= inb(ioaddr
->nsect_addr
);
2311 lbal
= inb(ioaddr
->lbal_addr
);
2313 if ((nsect
== 1) && (lbal
== 1))
2315 if (time_after(jiffies
, timeout
)) {
2319 msleep(50); /* give drive a breather */
2322 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2324 /* is all this really necessary? */
2325 ap
->ops
->dev_select(ap
, 0);
2327 ap
->ops
->dev_select(ap
, 1);
2329 ap
->ops
->dev_select(ap
, 0);
2332 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2333 unsigned int devmask
)
2335 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2337 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2339 /* software reset. causes dev0 to be selected */
2340 if (ap
->flags
& ATA_FLAG_MMIO
) {
2341 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2342 udelay(20); /* FIXME: flush */
2343 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2344 udelay(20); /* FIXME: flush */
2345 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2347 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2349 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2351 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2354 /* spec mandates ">= 2ms" before checking status.
2355 * We wait 150ms, because that was the magic delay used for
2356 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2357 * between when the ATA command register is written, and then
2358 * status is checked. Because waiting for "a while" before
2359 * checking status is fine, post SRST, we perform this magic
2360 * delay here as well.
2362 * Old drivers/ide uses the 2mS rule and then waits for ready
2366 /* Before we perform post reset processing we want to see if
2367 * the bus shows 0xFF because the odd clown forgets the D7
2368 * pulldown resistor.
2370 if (ata_check_status(ap
) == 0xFF) {
2371 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2372 return AC_ERR_OTHER
;
2375 ata_bus_post_reset(ap
, devmask
);
2381 * ata_bus_reset - reset host port and associated ATA channel
2382 * @ap: port to reset
2384 * This is typically the first time we actually start issuing
2385 * commands to the ATA channel. We wait for BSY to clear, then
2386 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2387 * result. Determine what devices, if any, are on the channel
2388 * by looking at the device 0/1 error register. Look at the signature
2389 * stored in each device's taskfile registers, to determine if
2390 * the device is ATA or ATAPI.
2393 * PCI/etc. bus probe sem.
2394 * Obtains host_set lock.
2397 * Sets ATA_FLAG_DISABLED if bus reset fails.
2400 void ata_bus_reset(struct ata_port
*ap
)
2402 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2403 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2405 unsigned int dev0
, dev1
= 0, devmask
= 0;
2407 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2409 /* determine if device 0/1 are present */
2410 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2413 dev0
= ata_devchk(ap
, 0);
2415 dev1
= ata_devchk(ap
, 1);
2419 devmask
|= (1 << 0);
2421 devmask
|= (1 << 1);
2423 /* select device 0 again */
2424 ap
->ops
->dev_select(ap
, 0);
2426 /* issue bus reset */
2427 if (ap
->flags
& ATA_FLAG_SRST
)
2428 if (ata_bus_softreset(ap
, devmask
))
2432 * determine by signature whether we have ATA or ATAPI devices
2434 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2435 if ((slave_possible
) && (err
!= 0x81))
2436 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2438 /* re-enable interrupts */
2439 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2442 /* is double-select really necessary? */
2443 if (ap
->device
[1].class != ATA_DEV_NONE
)
2444 ap
->ops
->dev_select(ap
, 1);
2445 if (ap
->device
[0].class != ATA_DEV_NONE
)
2446 ap
->ops
->dev_select(ap
, 0);
2448 /* if no devices were detected, disable this port */
2449 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2450 (ap
->device
[1].class == ATA_DEV_NONE
))
2453 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2454 /* set up device control for ATA_FLAG_SATA_RESET */
2455 if (ap
->flags
& ATA_FLAG_MMIO
)
2456 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2458 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2465 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2466 ap
->ops
->port_disable(ap
);
2472 * sata_phy_debounce - debounce SATA phy status
2473 * @ap: ATA port to debounce SATA phy status for
2474 * @params: timing parameters { interval, duratinon, timeout } in msec
2476 * Make sure SStatus of @ap reaches stable state, determined by
2477 * holding the same value where DET is not 1 for @duration polled
2478 * every @interval, before @timeout. Timeout constraints the
2479 * beginning of the stable state. Because, after hot unplugging,
2480 * DET gets stuck at 1 on some controllers, this functions waits
2481 * until timeout then returns 0 if DET is stable at 1.
2484 * Kernel thread context (may sleep)
2487 * 0 on success, -errno on failure.
2489 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2491 unsigned long interval_msec
= params
[0];
2492 unsigned long duration
= params
[1] * HZ
/ 1000;
2493 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2494 unsigned long last_jiffies
;
2498 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2503 last_jiffies
= jiffies
;
2506 msleep(interval_msec
);
2507 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2513 if (cur
== 1 && time_before(jiffies
, timeout
))
2515 if (time_after(jiffies
, last_jiffies
+ duration
))
2520 /* unstable, start over */
2522 last_jiffies
= jiffies
;
2525 if (time_after(jiffies
, timeout
))
2531 * sata_phy_resume - resume SATA phy
2532 * @ap: ATA port to resume SATA phy for
2533 * @params: timing parameters { interval, duratinon, timeout } in msec
2535 * Resume SATA phy of @ap and debounce it.
2538 * Kernel thread context (may sleep)
2541 * 0 on success, -errno on failure.
2543 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2548 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2551 scontrol
= (scontrol
& 0x0f0) | 0x300;
2553 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2556 /* Some PHYs react badly if SStatus is pounded immediately
2557 * after resuming. Delay 200ms before debouncing.
2561 return sata_phy_debounce(ap
, params
);
2564 static void ata_wait_spinup(struct ata_port
*ap
)
2566 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2567 unsigned long end
, secs
;
2570 /* first, debounce phy if SATA */
2571 if (ap
->cbl
== ATA_CBL_SATA
) {
2572 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2574 /* if debounced successfully and offline, no need to wait */
2575 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2579 /* okay, let's give the drive time to spin up */
2580 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2581 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2583 if (time_after(jiffies
, end
))
2587 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2588 "(%lu secs)\n", secs
);
2590 schedule_timeout_uninterruptible(end
- jiffies
);
2594 * ata_std_prereset - prepare for reset
2595 * @ap: ATA port to be reset
2597 * @ap is about to be reset. Initialize it.
2600 * Kernel thread context (may sleep)
2603 * 0 on success, -errno otherwise.
2605 int ata_std_prereset(struct ata_port
*ap
)
2607 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2608 const unsigned long *timing
;
2612 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2613 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2614 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2615 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2616 ata_wait_spinup(ap
);
2619 /* if we're about to do hardreset, nothing more to do */
2620 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2623 /* if SATA, resume phy */
2624 if (ap
->cbl
== ATA_CBL_SATA
) {
2625 if (ap
->flags
& ATA_FLAG_LOADING
)
2626 timing
= sata_deb_timing_boot
;
2628 timing
= sata_deb_timing_eh
;
2630 rc
= sata_phy_resume(ap
, timing
);
2631 if (rc
&& rc
!= -EOPNOTSUPP
) {
2632 /* phy resume failed */
2633 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2634 "link for reset (errno=%d)\n", rc
);
2639 /* Wait for !BSY if the controller can wait for the first D2H
2640 * Reg FIS and we don't know that no device is attached.
2642 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2643 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2649 * ata_std_softreset - reset host port via ATA SRST
2650 * @ap: port to reset
2651 * @classes: resulting classes of attached devices
2653 * Reset host port using ATA SRST.
2656 * Kernel thread context (may sleep)
2659 * 0 on success, -errno otherwise.
2661 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2663 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2664 unsigned int devmask
= 0, err_mask
;
2669 if (ata_port_offline(ap
)) {
2670 classes
[0] = ATA_DEV_NONE
;
2674 /* determine if device 0/1 are present */
2675 if (ata_devchk(ap
, 0))
2676 devmask
|= (1 << 0);
2677 if (slave_possible
&& ata_devchk(ap
, 1))
2678 devmask
|= (1 << 1);
2680 /* select device 0 again */
2681 ap
->ops
->dev_select(ap
, 0);
2683 /* issue bus reset */
2684 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2685 err_mask
= ata_bus_softreset(ap
, devmask
);
2687 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2692 /* determine by signature whether we have ATA or ATAPI devices */
2693 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2694 if (slave_possible
&& err
!= 0x81)
2695 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2698 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2703 * sata_std_hardreset - reset host port via SATA phy reset
2704 * @ap: port to reset
2705 * @class: resulting class of attached device
2707 * SATA phy-reset host port using DET bits of SControl register.
2710 * Kernel thread context (may sleep)
2713 * 0 on success, -errno otherwise.
2715 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2722 if (sata_set_spd_needed(ap
)) {
2723 /* SATA spec says nothing about how to reconfigure
2724 * spd. To be on the safe side, turn off phy during
2725 * reconfiguration. This works for at least ICH7 AHCI
2728 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2731 scontrol
= (scontrol
& 0x0f0) | 0x302;
2733 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2739 /* issue phy wake/reset */
2740 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2743 scontrol
= (scontrol
& 0x0f0) | 0x301;
2745 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2748 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2749 * 10.4.2 says at least 1 ms.
2753 /* bring phy back */
2754 sata_phy_resume(ap
, sata_deb_timing_eh
);
2756 /* TODO: phy layer with polling, timeouts, etc. */
2757 if (ata_port_offline(ap
)) {
2758 *class = ATA_DEV_NONE
;
2759 DPRINTK("EXIT, link offline\n");
2763 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2764 ata_port_printk(ap
, KERN_ERR
,
2765 "COMRESET failed (device not ready)\n");
2769 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2771 *class = ata_dev_try_classify(ap
, 0, NULL
);
2773 DPRINTK("EXIT, class=%u\n", *class);
2778 * ata_std_postreset - standard postreset callback
2779 * @ap: the target ata_port
2780 * @classes: classes of attached devices
2782 * This function is invoked after a successful reset. Note that
2783 * the device might have been reset more than once using
2784 * different reset methods before postreset is invoked.
2787 * Kernel thread context (may sleep)
2789 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2795 /* print link status */
2796 sata_print_link_status(ap
);
2799 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2800 sata_scr_write(ap
, SCR_ERROR
, serror
);
2802 /* re-enable interrupts */
2803 if (!ap
->ops
->error_handler
) {
2804 /* FIXME: hack. create a hook instead */
2805 if (ap
->ioaddr
.ctl_addr
)
2809 /* is double-select really necessary? */
2810 if (classes
[0] != ATA_DEV_NONE
)
2811 ap
->ops
->dev_select(ap
, 1);
2812 if (classes
[1] != ATA_DEV_NONE
)
2813 ap
->ops
->dev_select(ap
, 0);
2815 /* bail out if no device is present */
2816 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2817 DPRINTK("EXIT, no device\n");
2821 /* set up device control */
2822 if (ap
->ioaddr
.ctl_addr
) {
2823 if (ap
->flags
& ATA_FLAG_MMIO
)
2824 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2826 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2833 * ata_dev_same_device - Determine whether new ID matches configured device
2834 * @dev: device to compare against
2835 * @new_class: class of the new device
2836 * @new_id: IDENTIFY page of the new device
2838 * Compare @new_class and @new_id against @dev and determine
2839 * whether @dev is the device indicated by @new_class and
2846 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2848 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2851 const u16
*old_id
= dev
->id
;
2852 unsigned char model
[2][41], serial
[2][21];
2855 if (dev
->class != new_class
) {
2856 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2857 dev
->class, new_class
);
2861 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2862 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2863 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2864 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2865 new_n_sectors
= ata_id_n_sectors(new_id
);
2867 if (strcmp(model
[0], model
[1])) {
2868 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2869 "'%s' != '%s'\n", model
[0], model
[1]);
2873 if (strcmp(serial
[0], serial
[1])) {
2874 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2875 "'%s' != '%s'\n", serial
[0], serial
[1]);
2879 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2880 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2882 (unsigned long long)dev
->n_sectors
,
2883 (unsigned long long)new_n_sectors
);
2891 * ata_dev_revalidate - Revalidate ATA device
2892 * @dev: device to revalidate
2893 * @post_reset: is this revalidation after reset?
2895 * Re-read IDENTIFY page and make sure @dev is still attached to
2899 * Kernel thread context (may sleep)
2902 * 0 on success, negative errno otherwise
2904 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2906 unsigned int class = dev
->class;
2907 u16
*id
= (void *)dev
->ap
->sector_buf
;
2910 if (!ata_dev_enabled(dev
)) {
2916 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2920 /* is the device still there? */
2921 if (!ata_dev_same_device(dev
, class, id
)) {
2926 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2928 /* configure device according to the new ID */
2929 rc
= ata_dev_configure(dev
, 0);
2934 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2938 static const char * const ata_dma_blacklist
[] = {
2939 "WDC AC11000H", NULL
,
2940 "WDC AC22100H", NULL
,
2941 "WDC AC32500H", NULL
,
2942 "WDC AC33100H", NULL
,
2943 "WDC AC31600H", NULL
,
2944 "WDC AC32100H", "24.09P07",
2945 "WDC AC23200L", "21.10N21",
2946 "Compaq CRD-8241B", NULL
,
2951 "SanDisk SDP3B", NULL
,
2952 "SanDisk SDP3B-64", NULL
,
2953 "SANYO CD-ROM CRD", NULL
,
2954 "HITACHI CDR-8", NULL
,
2955 "HITACHI CDR-8335", NULL
,
2956 "HITACHI CDR-8435", NULL
,
2957 "Toshiba CD-ROM XM-6202B", NULL
,
2958 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2960 "E-IDE CD-ROM CR-840", NULL
,
2961 "CD-ROM Drive/F5A", NULL
,
2962 "WPI CDD-820", NULL
,
2963 "SAMSUNG CD-ROM SC-148C", NULL
,
2964 "SAMSUNG CD-ROM SC", NULL
,
2965 "SanDisk SDP3B-64", NULL
,
2966 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2967 "_NEC DV5800A", NULL
,
2968 "SAMSUNG CD-ROM SN-124", "N001"
2971 static int ata_strim(char *s
, size_t len
)
2973 len
= strnlen(s
, len
);
2975 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2976 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2983 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2985 unsigned char model_num
[40];
2986 unsigned char model_rev
[16];
2987 unsigned int nlen
, rlen
;
2990 /* We don't support polling DMA.
2991 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
2992 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
2994 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
2995 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
2998 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3000 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3002 nlen
= ata_strim(model_num
, sizeof(model_num
));
3003 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3005 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3006 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3007 if (ata_dma_blacklist
[i
+1] == NULL
)
3009 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3017 * ata_dev_xfermask - Compute supported xfermask of the given device
3018 * @dev: Device to compute xfermask for
3020 * Compute supported xfermask of @dev and store it in
3021 * dev->*_mask. This function is responsible for applying all
3022 * known limits including host controller limits, device
3025 * FIXME: The current implementation limits all transfer modes to
3026 * the fastest of the lowested device on the port. This is not
3027 * required on most controllers.
3032 static void ata_dev_xfermask(struct ata_device
*dev
)
3034 struct ata_port
*ap
= dev
->ap
;
3035 struct ata_host_set
*hs
= ap
->host_set
;
3036 unsigned long xfer_mask
;
3039 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3040 ap
->mwdma_mask
, ap
->udma_mask
);
3042 /* Apply cable rule here. Don't apply it early because when
3043 * we handle hot plug the cable type can itself change.
3045 if (ap
->cbl
== ATA_CBL_PATA40
)
3046 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3048 /* FIXME: Use port-wide xfermask for now */
3049 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3050 struct ata_device
*d
= &ap
->device
[i
];
3052 if (ata_dev_absent(d
))
3055 if (ata_dev_disabled(d
)) {
3056 /* to avoid violating device selection timing */
3057 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3058 UINT_MAX
, UINT_MAX
);
3062 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3063 d
->mwdma_mask
, d
->udma_mask
);
3064 xfer_mask
&= ata_id_xfermask(d
->id
);
3065 if (ata_dma_blacklisted(d
))
3066 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3069 if (ata_dma_blacklisted(dev
))
3070 ata_dev_printk(dev
, KERN_WARNING
,
3071 "device is on DMA blacklist, disabling DMA\n");
3073 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3074 if (hs
->simplex_claimed
)
3075 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3078 if (ap
->ops
->mode_filter
)
3079 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3081 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3082 &dev
->mwdma_mask
, &dev
->udma_mask
);
3086 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3087 * @dev: Device to which command will be sent
3089 * Issue SET FEATURES - XFER MODE command to device @dev
3093 * PCI/etc. bus probe sem.
3096 * 0 on success, AC_ERR_* mask otherwise.
3099 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3101 struct ata_taskfile tf
;
3102 unsigned int err_mask
;
3104 /* set up set-features taskfile */
3105 DPRINTK("set features - xfer mode\n");
3107 ata_tf_init(dev
, &tf
);
3108 tf
.command
= ATA_CMD_SET_FEATURES
;
3109 tf
.feature
= SETFEATURES_XFER
;
3110 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3111 tf
.protocol
= ATA_PROT_NODATA
;
3112 tf
.nsect
= dev
->xfer_mode
;
3114 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3116 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3121 * ata_dev_init_params - Issue INIT DEV PARAMS command
3122 * @dev: Device to which command will be sent
3123 * @heads: Number of heads (taskfile parameter)
3124 * @sectors: Number of sectors (taskfile parameter)
3127 * Kernel thread context (may sleep)
3130 * 0 on success, AC_ERR_* mask otherwise.
3132 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3133 u16 heads
, u16 sectors
)
3135 struct ata_taskfile tf
;
3136 unsigned int err_mask
;
3138 /* Number of sectors per track 1-255. Number of heads 1-16 */
3139 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3140 return AC_ERR_INVALID
;
3142 /* set up init dev params taskfile */
3143 DPRINTK("init dev params \n");
3145 ata_tf_init(dev
, &tf
);
3146 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3147 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3148 tf
.protocol
= ATA_PROT_NODATA
;
3150 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3152 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3154 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3159 * ata_sg_clean - Unmap DMA memory associated with command
3160 * @qc: Command containing DMA memory to be released
3162 * Unmap all mapped DMA memory associated with this command.
3165 * spin_lock_irqsave(host_set lock)
3168 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3170 struct ata_port
*ap
= qc
->ap
;
3171 struct scatterlist
*sg
= qc
->__sg
;
3172 int dir
= qc
->dma_dir
;
3173 void *pad_buf
= NULL
;
3175 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3176 WARN_ON(sg
== NULL
);
3178 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3179 WARN_ON(qc
->n_elem
> 1);
3181 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3183 /* if we padded the buffer out to 32-bit bound, and data
3184 * xfer direction is from-device, we must copy from the
3185 * pad buffer back into the supplied buffer
3187 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3188 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3190 if (qc
->flags
& ATA_QCFLAG_SG
) {
3192 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3193 /* restore last sg */
3194 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3196 struct scatterlist
*psg
= &qc
->pad_sgent
;
3197 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3198 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3199 kunmap_atomic(addr
, KM_IRQ0
);
3203 dma_unmap_single(ap
->dev
,
3204 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3207 sg
->length
+= qc
->pad_len
;
3209 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3210 pad_buf
, qc
->pad_len
);
3213 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3218 * ata_fill_sg - Fill PCI IDE PRD table
3219 * @qc: Metadata associated with taskfile to be transferred
3221 * Fill PCI IDE PRD (scatter-gather) table with segments
3222 * associated with the current disk command.
3225 * spin_lock_irqsave(host_set lock)
3228 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3230 struct ata_port
*ap
= qc
->ap
;
3231 struct scatterlist
*sg
;
3234 WARN_ON(qc
->__sg
== NULL
);
3235 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3238 ata_for_each_sg(sg
, qc
) {
3242 /* determine if physical DMA addr spans 64K boundary.
3243 * Note h/w doesn't support 64-bit, so we unconditionally
3244 * truncate dma_addr_t to u32.
3246 addr
= (u32
) sg_dma_address(sg
);
3247 sg_len
= sg_dma_len(sg
);
3250 offset
= addr
& 0xffff;
3252 if ((offset
+ sg_len
) > 0x10000)
3253 len
= 0x10000 - offset
;
3255 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3256 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3257 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3266 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3269 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3270 * @qc: Metadata associated with taskfile to check
3272 * Allow low-level driver to filter ATA PACKET commands, returning
3273 * a status indicating whether or not it is OK to use DMA for the
3274 * supplied PACKET command.
3277 * spin_lock_irqsave(host_set lock)
3279 * RETURNS: 0 when ATAPI DMA can be used
3282 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3284 struct ata_port
*ap
= qc
->ap
;
3285 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3287 if (ap
->ops
->check_atapi_dma
)
3288 rc
= ap
->ops
->check_atapi_dma(qc
);
3293 * ata_qc_prep - Prepare taskfile for submission
3294 * @qc: Metadata associated with taskfile to be prepared
3296 * Prepare ATA taskfile for submission.
3299 * spin_lock_irqsave(host_set lock)
3301 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3303 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3309 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3312 * ata_sg_init_one - Associate command with memory buffer
3313 * @qc: Command to be associated
3314 * @buf: Memory buffer
3315 * @buflen: Length of memory buffer, in bytes.
3317 * Initialize the data-related elements of queued_cmd @qc
3318 * to point to a single memory buffer, @buf of byte length @buflen.
3321 * spin_lock_irqsave(host_set lock)
3324 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3326 struct scatterlist
*sg
;
3328 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3330 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3331 qc
->__sg
= &qc
->sgent
;
3333 qc
->orig_n_elem
= 1;
3335 qc
->nbytes
= buflen
;
3338 sg_init_one(sg
, buf
, buflen
);
3342 * ata_sg_init - Associate command with scatter-gather table.
3343 * @qc: Command to be associated
3344 * @sg: Scatter-gather table.
3345 * @n_elem: Number of elements in s/g table.
3347 * Initialize the data-related elements of queued_cmd @qc
3348 * to point to a scatter-gather table @sg, containing @n_elem
3352 * spin_lock_irqsave(host_set lock)
3355 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3356 unsigned int n_elem
)
3358 qc
->flags
|= ATA_QCFLAG_SG
;
3360 qc
->n_elem
= n_elem
;
3361 qc
->orig_n_elem
= n_elem
;
3365 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3366 * @qc: Command with memory buffer to be mapped.
3368 * DMA-map the memory buffer associated with queued_cmd @qc.
3371 * spin_lock_irqsave(host_set lock)
3374 * Zero on success, negative on error.
3377 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3379 struct ata_port
*ap
= qc
->ap
;
3380 int dir
= qc
->dma_dir
;
3381 struct scatterlist
*sg
= qc
->__sg
;
3382 dma_addr_t dma_address
;
3385 /* we must lengthen transfers to end on a 32-bit boundary */
3386 qc
->pad_len
= sg
->length
& 3;
3388 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3389 struct scatterlist
*psg
= &qc
->pad_sgent
;
3391 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3393 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3395 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3396 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3399 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3400 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3402 sg
->length
-= qc
->pad_len
;
3403 if (sg
->length
== 0)
3406 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3407 sg
->length
, qc
->pad_len
);
3415 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3417 if (dma_mapping_error(dma_address
)) {
3419 sg
->length
+= qc
->pad_len
;
3423 sg_dma_address(sg
) = dma_address
;
3424 sg_dma_len(sg
) = sg
->length
;
3427 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3428 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3434 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3435 * @qc: Command with scatter-gather table to be mapped.
3437 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3440 * spin_lock_irqsave(host_set lock)
3443 * Zero on success, negative on error.
3447 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3449 struct ata_port
*ap
= qc
->ap
;
3450 struct scatterlist
*sg
= qc
->__sg
;
3451 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3452 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3454 VPRINTK("ENTER, ata%u\n", ap
->id
);
3455 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3457 /* we must lengthen transfers to end on a 32-bit boundary */
3458 qc
->pad_len
= lsg
->length
& 3;
3460 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3461 struct scatterlist
*psg
= &qc
->pad_sgent
;
3462 unsigned int offset
;
3464 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3466 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3469 * psg->page/offset are used to copy to-be-written
3470 * data in this function or read data in ata_sg_clean.
3472 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3473 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3474 psg
->offset
= offset_in_page(offset
);
3476 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3477 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3478 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3479 kunmap_atomic(addr
, KM_IRQ0
);
3482 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3483 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3485 lsg
->length
-= qc
->pad_len
;
3486 if (lsg
->length
== 0)
3489 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3490 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3493 pre_n_elem
= qc
->n_elem
;
3494 if (trim_sg
&& pre_n_elem
)
3503 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3505 /* restore last sg */
3506 lsg
->length
+= qc
->pad_len
;
3510 DPRINTK("%d sg elements mapped\n", n_elem
);
3513 qc
->n_elem
= n_elem
;
3519 * swap_buf_le16 - swap halves of 16-bit words in place
3520 * @buf: Buffer to swap
3521 * @buf_words: Number of 16-bit words in buffer.
3523 * Swap halves of 16-bit words if needed to convert from
3524 * little-endian byte order to native cpu byte order, or
3528 * Inherited from caller.
3530 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3535 for (i
= 0; i
< buf_words
; i
++)
3536 buf
[i
] = le16_to_cpu(buf
[i
]);
3537 #endif /* __BIG_ENDIAN */
3541 * ata_mmio_data_xfer - Transfer data by MMIO
3542 * @adev: device for this I/O
3544 * @buflen: buffer length
3545 * @write_data: read/write
3547 * Transfer data from/to the device data register by MMIO.
3550 * Inherited from caller.
3553 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3554 unsigned int buflen
, int write_data
)
3556 struct ata_port
*ap
= adev
->ap
;
3558 unsigned int words
= buflen
>> 1;
3559 u16
*buf16
= (u16
*) buf
;
3560 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3562 /* Transfer multiple of 2 bytes */
3564 for (i
= 0; i
< words
; i
++)
3565 writew(le16_to_cpu(buf16
[i
]), mmio
);
3567 for (i
= 0; i
< words
; i
++)
3568 buf16
[i
] = cpu_to_le16(readw(mmio
));
3571 /* Transfer trailing 1 byte, if any. */
3572 if (unlikely(buflen
& 0x01)) {
3573 u16 align_buf
[1] = { 0 };
3574 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3577 memcpy(align_buf
, trailing_buf
, 1);
3578 writew(le16_to_cpu(align_buf
[0]), mmio
);
3580 align_buf
[0] = cpu_to_le16(readw(mmio
));
3581 memcpy(trailing_buf
, align_buf
, 1);
3587 * ata_pio_data_xfer - Transfer data by PIO
3588 * @adev: device to target
3590 * @buflen: buffer length
3591 * @write_data: read/write
3593 * Transfer data from/to the device data register by PIO.
3596 * Inherited from caller.
3599 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3600 unsigned int buflen
, int write_data
)
3602 struct ata_port
*ap
= adev
->ap
;
3603 unsigned int words
= buflen
>> 1;
3605 /* Transfer multiple of 2 bytes */
3607 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3609 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3611 /* Transfer trailing 1 byte, if any. */
3612 if (unlikely(buflen
& 0x01)) {
3613 u16 align_buf
[1] = { 0 };
3614 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3617 memcpy(align_buf
, trailing_buf
, 1);
3618 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3620 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3621 memcpy(trailing_buf
, align_buf
, 1);
3627 * ata_pio_data_xfer_noirq - Transfer data by PIO
3628 * @adev: device to target
3630 * @buflen: buffer length
3631 * @write_data: read/write
3633 * Transfer data from/to the device data register by PIO. Do the
3634 * transfer with interrupts disabled.
3637 * Inherited from caller.
3640 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3641 unsigned int buflen
, int write_data
)
3643 unsigned long flags
;
3644 local_irq_save(flags
);
3645 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3646 local_irq_restore(flags
);
3651 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3652 * @qc: Command on going
3654 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3657 * Inherited from caller.
3660 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3662 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3663 struct scatterlist
*sg
= qc
->__sg
;
3664 struct ata_port
*ap
= qc
->ap
;
3666 unsigned int offset
;
3669 if (qc
->cursect
== (qc
->nsect
- 1))
3670 ap
->hsm_task_state
= HSM_ST_LAST
;
3672 page
= sg
[qc
->cursg
].page
;
3673 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3675 /* get the current page and offset */
3676 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3677 offset
%= PAGE_SIZE
;
3679 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3681 if (PageHighMem(page
)) {
3682 unsigned long flags
;
3684 /* FIXME: use a bounce buffer */
3685 local_irq_save(flags
);
3686 buf
= kmap_atomic(page
, KM_IRQ0
);
3688 /* do the actual data transfer */
3689 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3691 kunmap_atomic(buf
, KM_IRQ0
);
3692 local_irq_restore(flags
);
3694 buf
= page_address(page
);
3695 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3701 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3708 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3709 * @qc: Command on going
3711 * Transfer one or many ATA_SECT_SIZE of data from/to the
3712 * ATA device for the DRQ request.
3715 * Inherited from caller.
3718 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3720 if (is_multi_taskfile(&qc
->tf
)) {
3721 /* READ/WRITE MULTIPLE */
3724 WARN_ON(qc
->dev
->multi_count
== 0);
3726 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3734 * atapi_send_cdb - Write CDB bytes to hardware
3735 * @ap: Port to which ATAPI device is attached.
3736 * @qc: Taskfile currently active
3738 * When device has indicated its readiness to accept
3739 * a CDB, this function is called. Send the CDB.
3745 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3748 DPRINTK("send cdb\n");
3749 WARN_ON(qc
->dev
->cdb_len
< 12);
3751 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3752 ata_altstatus(ap
); /* flush */
3754 switch (qc
->tf
.protocol
) {
3755 case ATA_PROT_ATAPI
:
3756 ap
->hsm_task_state
= HSM_ST
;
3758 case ATA_PROT_ATAPI_NODATA
:
3759 ap
->hsm_task_state
= HSM_ST_LAST
;
3761 case ATA_PROT_ATAPI_DMA
:
3762 ap
->hsm_task_state
= HSM_ST_LAST
;
3763 /* initiate bmdma */
3764 ap
->ops
->bmdma_start(qc
);
3770 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3771 * @qc: Command on going
3772 * @bytes: number of bytes
3774 * Transfer Transfer data from/to the ATAPI device.
3777 * Inherited from caller.
3781 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3783 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3784 struct scatterlist
*sg
= qc
->__sg
;
3785 struct ata_port
*ap
= qc
->ap
;
3788 unsigned int offset
, count
;
3790 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3791 ap
->hsm_task_state
= HSM_ST_LAST
;
3794 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3796 * The end of qc->sg is reached and the device expects
3797 * more data to transfer. In order not to overrun qc->sg
3798 * and fulfill length specified in the byte count register,
3799 * - for read case, discard trailing data from the device
3800 * - for write case, padding zero data to the device
3802 u16 pad_buf
[1] = { 0 };
3803 unsigned int words
= bytes
>> 1;
3806 if (words
) /* warning if bytes > 1 */
3807 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3808 "%u bytes trailing data\n", bytes
);
3810 for (i
= 0; i
< words
; i
++)
3811 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3813 ap
->hsm_task_state
= HSM_ST_LAST
;
3817 sg
= &qc
->__sg
[qc
->cursg
];
3820 offset
= sg
->offset
+ qc
->cursg_ofs
;
3822 /* get the current page and offset */
3823 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3824 offset
%= PAGE_SIZE
;
3826 /* don't overrun current sg */
3827 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3829 /* don't cross page boundaries */
3830 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3832 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3834 if (PageHighMem(page
)) {
3835 unsigned long flags
;
3837 /* FIXME: use bounce buffer */
3838 local_irq_save(flags
);
3839 buf
= kmap_atomic(page
, KM_IRQ0
);
3841 /* do the actual data transfer */
3842 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3844 kunmap_atomic(buf
, KM_IRQ0
);
3845 local_irq_restore(flags
);
3847 buf
= page_address(page
);
3848 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3852 qc
->curbytes
+= count
;
3853 qc
->cursg_ofs
+= count
;
3855 if (qc
->cursg_ofs
== sg
->length
) {
3865 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3866 * @qc: Command on going
3868 * Transfer Transfer data from/to the ATAPI device.
3871 * Inherited from caller.
3874 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3876 struct ata_port
*ap
= qc
->ap
;
3877 struct ata_device
*dev
= qc
->dev
;
3878 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3879 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3881 /* Abuse qc->result_tf for temp storage of intermediate TF
3882 * here to save some kernel stack usage.
3883 * For normal completion, qc->result_tf is not relevant. For
3884 * error, qc->result_tf is later overwritten by ata_qc_complete().
3885 * So, the correctness of qc->result_tf is not affected.
3887 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3888 ireason
= qc
->result_tf
.nsect
;
3889 bc_lo
= qc
->result_tf
.lbam
;
3890 bc_hi
= qc
->result_tf
.lbah
;
3891 bytes
= (bc_hi
<< 8) | bc_lo
;
3893 /* shall be cleared to zero, indicating xfer of data */
3894 if (ireason
& (1 << 0))
3897 /* make sure transfer direction matches expected */
3898 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3899 if (do_write
!= i_write
)
3902 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3904 __atapi_pio_bytes(qc
, bytes
);
3909 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3910 qc
->err_mask
|= AC_ERR_HSM
;
3911 ap
->hsm_task_state
= HSM_ST_ERR
;
3915 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3916 * @ap: the target ata_port
3920 * 1 if ok in workqueue, 0 otherwise.
3923 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3925 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3928 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3929 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3930 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3933 if (is_atapi_taskfile(&qc
->tf
) &&
3934 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3942 * ata_hsm_qc_complete - finish a qc running on standard HSM
3943 * @qc: Command to complete
3944 * @in_wq: 1 if called from workqueue, 0 otherwise
3946 * Finish @qc which is running on standard HSM.
3949 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3950 * Otherwise, none on entry and grabs host lock.
3952 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3954 struct ata_port
*ap
= qc
->ap
;
3955 unsigned long flags
;
3957 if (ap
->ops
->error_handler
) {
3959 spin_lock_irqsave(ap
->lock
, flags
);
3961 /* EH might have kicked in while host_set lock
3964 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3966 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3968 ata_qc_complete(qc
);
3970 ata_port_freeze(ap
);
3973 spin_unlock_irqrestore(ap
->lock
, flags
);
3975 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3976 ata_qc_complete(qc
);
3978 ata_port_freeze(ap
);
3982 spin_lock_irqsave(ap
->lock
, flags
);
3984 ata_qc_complete(qc
);
3985 spin_unlock_irqrestore(ap
->lock
, flags
);
3987 ata_qc_complete(qc
);
3990 ata_altstatus(ap
); /* flush */
3994 * ata_hsm_move - move the HSM to the next state.
3995 * @ap: the target ata_port
3997 * @status: current device status
3998 * @in_wq: 1 if called from workqueue, 0 otherwise
4001 * 1 when poll next status needed, 0 otherwise.
4003 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4004 u8 status
, int in_wq
)
4006 unsigned long flags
= 0;
4009 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4011 /* Make sure ata_qc_issue_prot() does not throw things
4012 * like DMA polling into the workqueue. Notice that
4013 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4015 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4018 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4019 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4021 switch (ap
->hsm_task_state
) {
4023 /* Send first data block or PACKET CDB */
4025 /* If polling, we will stay in the work queue after
4026 * sending the data. Otherwise, interrupt handler
4027 * takes over after sending the data.
4029 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4031 /* check device status */
4032 if (unlikely((status
& ATA_DRQ
) == 0)) {
4033 /* handle BSY=0, DRQ=0 as error */
4034 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4035 /* device stops HSM for abort/error */
4036 qc
->err_mask
|= AC_ERR_DEV
;
4038 /* HSM violation. Let EH handle this */
4039 qc
->err_mask
|= AC_ERR_HSM
;
4041 ap
->hsm_task_state
= HSM_ST_ERR
;
4045 /* Device should not ask for data transfer (DRQ=1)
4046 * when it finds something wrong.
4047 * We ignore DRQ here and stop the HSM by
4048 * changing hsm_task_state to HSM_ST_ERR and
4049 * let the EH abort the command or reset the device.
4051 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4052 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4054 qc
->err_mask
|= AC_ERR_HSM
;
4055 ap
->hsm_task_state
= HSM_ST_ERR
;
4059 /* Send the CDB (atapi) or the first data block (ata pio out).
4060 * During the state transition, interrupt handler shouldn't
4061 * be invoked before the data transfer is complete and
4062 * hsm_task_state is changed. Hence, the following locking.
4065 spin_lock_irqsave(ap
->lock
, flags
);
4067 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4068 /* PIO data out protocol.
4069 * send first data block.
4072 /* ata_pio_sectors() might change the state
4073 * to HSM_ST_LAST. so, the state is changed here
4074 * before ata_pio_sectors().
4076 ap
->hsm_task_state
= HSM_ST
;
4077 ata_pio_sectors(qc
);
4078 ata_altstatus(ap
); /* flush */
4081 atapi_send_cdb(ap
, qc
);
4084 spin_unlock_irqrestore(ap
->lock
, flags
);
4086 /* if polling, ata_pio_task() handles the rest.
4087 * otherwise, interrupt handler takes over from here.
4092 /* complete command or read/write the data register */
4093 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4094 /* ATAPI PIO protocol */
4095 if ((status
& ATA_DRQ
) == 0) {
4096 /* No more data to transfer or device error.
4097 * Device error will be tagged in HSM_ST_LAST.
4099 ap
->hsm_task_state
= HSM_ST_LAST
;
4103 /* Device should not ask for data transfer (DRQ=1)
4104 * when it finds something wrong.
4105 * We ignore DRQ here and stop the HSM by
4106 * changing hsm_task_state to HSM_ST_ERR and
4107 * let the EH abort the command or reset the device.
4109 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4110 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4112 qc
->err_mask
|= AC_ERR_HSM
;
4113 ap
->hsm_task_state
= HSM_ST_ERR
;
4117 atapi_pio_bytes(qc
);
4119 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4120 /* bad ireason reported by device */
4124 /* ATA PIO protocol */
4125 if (unlikely((status
& ATA_DRQ
) == 0)) {
4126 /* handle BSY=0, DRQ=0 as error */
4127 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4128 /* device stops HSM for abort/error */
4129 qc
->err_mask
|= AC_ERR_DEV
;
4131 /* HSM violation. Let EH handle this */
4132 qc
->err_mask
|= AC_ERR_HSM
;
4134 ap
->hsm_task_state
= HSM_ST_ERR
;
4138 /* For PIO reads, some devices may ask for
4139 * data transfer (DRQ=1) alone with ERR=1.
4140 * We respect DRQ here and transfer one
4141 * block of junk data before changing the
4142 * hsm_task_state to HSM_ST_ERR.
4144 * For PIO writes, ERR=1 DRQ=1 doesn't make
4145 * sense since the data block has been
4146 * transferred to the device.
4148 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4149 /* data might be corrputed */
4150 qc
->err_mask
|= AC_ERR_DEV
;
4152 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4153 ata_pio_sectors(qc
);
4155 status
= ata_wait_idle(ap
);
4158 if (status
& (ATA_BUSY
| ATA_DRQ
))
4159 qc
->err_mask
|= AC_ERR_HSM
;
4161 /* ata_pio_sectors() might change the
4162 * state to HSM_ST_LAST. so, the state
4163 * is changed after ata_pio_sectors().
4165 ap
->hsm_task_state
= HSM_ST_ERR
;
4169 ata_pio_sectors(qc
);
4171 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4172 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4175 status
= ata_wait_idle(ap
);
4180 ata_altstatus(ap
); /* flush */
4185 if (unlikely(!ata_ok(status
))) {
4186 qc
->err_mask
|= __ac_err_mask(status
);
4187 ap
->hsm_task_state
= HSM_ST_ERR
;
4191 /* no more data to transfer */
4192 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4193 ap
->id
, qc
->dev
->devno
, status
);
4195 WARN_ON(qc
->err_mask
);
4197 ap
->hsm_task_state
= HSM_ST_IDLE
;
4199 /* complete taskfile transaction */
4200 ata_hsm_qc_complete(qc
, in_wq
);
4206 /* make sure qc->err_mask is available to
4207 * know what's wrong and recover
4209 WARN_ON(qc
->err_mask
== 0);
4211 ap
->hsm_task_state
= HSM_ST_IDLE
;
4213 /* complete taskfile transaction */
4214 ata_hsm_qc_complete(qc
, in_wq
);
4226 static void ata_pio_task(void *_data
)
4228 struct ata_queued_cmd
*qc
= _data
;
4229 struct ata_port
*ap
= qc
->ap
;
4234 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4237 * This is purely heuristic. This is a fast path.
4238 * Sometimes when we enter, BSY will be cleared in
4239 * a chk-status or two. If not, the drive is probably seeking
4240 * or something. Snooze for a couple msecs, then
4241 * chk-status again. If still busy, queue delayed work.
4243 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4244 if (status
& ATA_BUSY
) {
4246 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4247 if (status
& ATA_BUSY
) {
4248 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4254 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4256 /* another command or interrupt handler
4257 * may be running at this point.
4264 * ata_qc_new - Request an available ATA command, for queueing
4265 * @ap: Port associated with device @dev
4266 * @dev: Device from whom we request an available command structure
4272 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4274 struct ata_queued_cmd
*qc
= NULL
;
4277 /* no command while frozen */
4278 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4281 /* the last tag is reserved for internal command. */
4282 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4283 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4284 qc
= __ata_qc_from_tag(ap
, i
);
4295 * ata_qc_new_init - Request an available ATA command, and initialize it
4296 * @dev: Device from whom we request an available command structure
4302 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4304 struct ata_port
*ap
= dev
->ap
;
4305 struct ata_queued_cmd
*qc
;
4307 qc
= ata_qc_new(ap
);
4320 * ata_qc_free - free unused ata_queued_cmd
4321 * @qc: Command to complete
4323 * Designed to free unused ata_queued_cmd object
4324 * in case something prevents using it.
4327 * spin_lock_irqsave(host_set lock)
4329 void ata_qc_free(struct ata_queued_cmd
*qc
)
4331 struct ata_port
*ap
= qc
->ap
;
4334 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4338 if (likely(ata_tag_valid(tag
))) {
4339 qc
->tag
= ATA_TAG_POISON
;
4340 clear_bit(tag
, &ap
->qc_allocated
);
4344 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4346 struct ata_port
*ap
= qc
->ap
;
4348 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4349 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4351 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4354 /* command should be marked inactive atomically with qc completion */
4355 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4356 ap
->sactive
&= ~(1 << qc
->tag
);
4358 ap
->active_tag
= ATA_TAG_POISON
;
4360 /* atapi: mark qc as inactive to prevent the interrupt handler
4361 * from completing the command twice later, before the error handler
4362 * is called. (when rc != 0 and atapi request sense is needed)
4364 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4365 ap
->qc_active
&= ~(1 << qc
->tag
);
4367 /* call completion callback */
4368 qc
->complete_fn(qc
);
4372 * ata_qc_complete - Complete an active ATA command
4373 * @qc: Command to complete
4374 * @err_mask: ATA Status register contents
4376 * Indicate to the mid and upper layers that an ATA
4377 * command has completed, with either an ok or not-ok status.
4380 * spin_lock_irqsave(host_set lock)
4382 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4384 struct ata_port
*ap
= qc
->ap
;
4386 /* XXX: New EH and old EH use different mechanisms to
4387 * synchronize EH with regular execution path.
4389 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4390 * Normal execution path is responsible for not accessing a
4391 * failed qc. libata core enforces the rule by returning NULL
4392 * from ata_qc_from_tag() for failed qcs.
4394 * Old EH depends on ata_qc_complete() nullifying completion
4395 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4396 * not synchronize with interrupt handler. Only PIO task is
4399 if (ap
->ops
->error_handler
) {
4400 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4402 if (unlikely(qc
->err_mask
))
4403 qc
->flags
|= ATA_QCFLAG_FAILED
;
4405 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4406 if (!ata_tag_internal(qc
->tag
)) {
4407 /* always fill result TF for failed qc */
4408 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4409 ata_qc_schedule_eh(qc
);
4414 /* read result TF if requested */
4415 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4416 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4418 __ata_qc_complete(qc
);
4420 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4423 /* read result TF if failed or requested */
4424 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4425 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4427 __ata_qc_complete(qc
);
4432 * ata_qc_complete_multiple - Complete multiple qcs successfully
4433 * @ap: port in question
4434 * @qc_active: new qc_active mask
4435 * @finish_qc: LLDD callback invoked before completing a qc
4437 * Complete in-flight commands. This functions is meant to be
4438 * called from low-level driver's interrupt routine to complete
4439 * requests normally. ap->qc_active and @qc_active is compared
4440 * and commands are completed accordingly.
4443 * spin_lock_irqsave(host_set lock)
4446 * Number of completed commands on success, -errno otherwise.
4448 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4449 void (*finish_qc
)(struct ata_queued_cmd
*))
4455 done_mask
= ap
->qc_active
^ qc_active
;
4457 if (unlikely(done_mask
& qc_active
)) {
4458 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4459 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4463 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4464 struct ata_queued_cmd
*qc
;
4466 if (!(done_mask
& (1 << i
)))
4469 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4472 ata_qc_complete(qc
);
4480 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4482 struct ata_port
*ap
= qc
->ap
;
4484 switch (qc
->tf
.protocol
) {
4487 case ATA_PROT_ATAPI_DMA
:
4490 case ATA_PROT_ATAPI
:
4492 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4505 * ata_qc_issue - issue taskfile to device
4506 * @qc: command to issue to device
4508 * Prepare an ATA command to submission to device.
4509 * This includes mapping the data into a DMA-able
4510 * area, filling in the S/G table, and finally
4511 * writing the taskfile to hardware, starting the command.
4514 * spin_lock_irqsave(host_set lock)
4516 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4518 struct ata_port
*ap
= qc
->ap
;
4520 /* Make sure only one non-NCQ command is outstanding. The
4521 * check is skipped for old EH because it reuses active qc to
4522 * request ATAPI sense.
4524 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4526 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4527 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4528 ap
->sactive
|= 1 << qc
->tag
;
4530 WARN_ON(ap
->sactive
);
4531 ap
->active_tag
= qc
->tag
;
4534 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4535 ap
->qc_active
|= 1 << qc
->tag
;
4537 if (ata_should_dma_map(qc
)) {
4538 if (qc
->flags
& ATA_QCFLAG_SG
) {
4539 if (ata_sg_setup(qc
))
4541 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4542 if (ata_sg_setup_one(qc
))
4546 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4549 ap
->ops
->qc_prep(qc
);
4551 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4552 if (unlikely(qc
->err_mask
))
4557 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4558 qc
->err_mask
|= AC_ERR_SYSTEM
;
4560 ata_qc_complete(qc
);
4564 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4565 * @qc: command to issue to device
4567 * Using various libata functions and hooks, this function
4568 * starts an ATA command. ATA commands are grouped into
4569 * classes called "protocols", and issuing each type of protocol
4570 * is slightly different.
4572 * May be used as the qc_issue() entry in ata_port_operations.
4575 * spin_lock_irqsave(host_set lock)
4578 * Zero on success, AC_ERR_* mask on failure
4581 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4583 struct ata_port
*ap
= qc
->ap
;
4585 /* Use polling pio if the LLD doesn't handle
4586 * interrupt driven pio and atapi CDB interrupt.
4588 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4589 switch (qc
->tf
.protocol
) {
4591 case ATA_PROT_ATAPI
:
4592 case ATA_PROT_ATAPI_NODATA
:
4593 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4595 case ATA_PROT_ATAPI_DMA
:
4596 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4597 /* see ata_dma_blacklisted() */
4605 /* select the device */
4606 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4608 /* start the command */
4609 switch (qc
->tf
.protocol
) {
4610 case ATA_PROT_NODATA
:
4611 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4612 ata_qc_set_polling(qc
);
4614 ata_tf_to_host(ap
, &qc
->tf
);
4615 ap
->hsm_task_state
= HSM_ST_LAST
;
4617 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4618 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4623 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4625 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4626 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4627 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4628 ap
->hsm_task_state
= HSM_ST_LAST
;
4632 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4633 ata_qc_set_polling(qc
);
4635 ata_tf_to_host(ap
, &qc
->tf
);
4637 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4638 /* PIO data out protocol */
4639 ap
->hsm_task_state
= HSM_ST_FIRST
;
4640 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4642 /* always send first data block using
4643 * the ata_pio_task() codepath.
4646 /* PIO data in protocol */
4647 ap
->hsm_task_state
= HSM_ST
;
4649 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4650 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4652 /* if polling, ata_pio_task() handles the rest.
4653 * otherwise, interrupt handler takes over from here.
4659 case ATA_PROT_ATAPI
:
4660 case ATA_PROT_ATAPI_NODATA
:
4661 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4662 ata_qc_set_polling(qc
);
4664 ata_tf_to_host(ap
, &qc
->tf
);
4666 ap
->hsm_task_state
= HSM_ST_FIRST
;
4668 /* send cdb by polling if no cdb interrupt */
4669 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4670 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4671 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4674 case ATA_PROT_ATAPI_DMA
:
4675 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4677 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4678 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4679 ap
->hsm_task_state
= HSM_ST_FIRST
;
4681 /* send cdb by polling if no cdb interrupt */
4682 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4683 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4688 return AC_ERR_SYSTEM
;
4695 * ata_host_intr - Handle host interrupt for given (port, task)
4696 * @ap: Port on which interrupt arrived (possibly...)
4697 * @qc: Taskfile currently active in engine
4699 * Handle host interrupt for given queued command. Currently,
4700 * only DMA interrupts are handled. All other commands are
4701 * handled via polling with interrupts disabled (nIEN bit).
4704 * spin_lock_irqsave(host_set lock)
4707 * One if interrupt was handled, zero if not (shared irq).
4710 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4711 struct ata_queued_cmd
*qc
)
4713 u8 status
, host_stat
= 0;
4715 VPRINTK("ata%u: protocol %d task_state %d\n",
4716 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4718 /* Check whether we are expecting interrupt in this state */
4719 switch (ap
->hsm_task_state
) {
4721 /* Some pre-ATAPI-4 devices assert INTRQ
4722 * at this state when ready to receive CDB.
4725 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4726 * The flag was turned on only for atapi devices.
4727 * No need to check is_atapi_taskfile(&qc->tf) again.
4729 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4733 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4734 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4735 /* check status of DMA engine */
4736 host_stat
= ap
->ops
->bmdma_status(ap
);
4737 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4739 /* if it's not our irq... */
4740 if (!(host_stat
& ATA_DMA_INTR
))
4743 /* before we do anything else, clear DMA-Start bit */
4744 ap
->ops
->bmdma_stop(qc
);
4746 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4747 /* error when transfering data to/from memory */
4748 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4749 ap
->hsm_task_state
= HSM_ST_ERR
;
4759 /* check altstatus */
4760 status
= ata_altstatus(ap
);
4761 if (status
& ATA_BUSY
)
4764 /* check main status, clearing INTRQ */
4765 status
= ata_chk_status(ap
);
4766 if (unlikely(status
& ATA_BUSY
))
4769 /* ack bmdma irq events */
4770 ap
->ops
->irq_clear(ap
);
4772 ata_hsm_move(ap
, qc
, status
, 0);
4773 return 1; /* irq handled */
4776 ap
->stats
.idle_irq
++;
4779 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4780 ata_irq_ack(ap
, 0); /* debug trap */
4781 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4785 return 0; /* irq not handled */
4789 * ata_interrupt - Default ATA host interrupt handler
4790 * @irq: irq line (unused)
4791 * @dev_instance: pointer to our ata_host_set information structure
4794 * Default interrupt handler for PCI IDE devices. Calls
4795 * ata_host_intr() for each port that is not disabled.
4798 * Obtains host_set lock during operation.
4801 * IRQ_NONE or IRQ_HANDLED.
4804 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4806 struct ata_host_set
*host_set
= dev_instance
;
4808 unsigned int handled
= 0;
4809 unsigned long flags
;
4811 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4812 spin_lock_irqsave(&host_set
->lock
, flags
);
4814 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4815 struct ata_port
*ap
;
4817 ap
= host_set
->ports
[i
];
4819 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4820 struct ata_queued_cmd
*qc
;
4822 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4823 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4824 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4825 handled
|= ata_host_intr(ap
, qc
);
4829 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4831 return IRQ_RETVAL(handled
);
4835 * sata_scr_valid - test whether SCRs are accessible
4836 * @ap: ATA port to test SCR accessibility for
4838 * Test whether SCRs are accessible for @ap.
4844 * 1 if SCRs are accessible, 0 otherwise.
4846 int sata_scr_valid(struct ata_port
*ap
)
4848 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4852 * sata_scr_read - read SCR register of the specified port
4853 * @ap: ATA port to read SCR for
4855 * @val: Place to store read value
4857 * Read SCR register @reg of @ap into *@val. This function is
4858 * guaranteed to succeed if the cable type of the port is SATA
4859 * and the port implements ->scr_read.
4865 * 0 on success, negative errno on failure.
4867 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4869 if (sata_scr_valid(ap
)) {
4870 *val
= ap
->ops
->scr_read(ap
, reg
);
4877 * sata_scr_write - write SCR register of the specified port
4878 * @ap: ATA port to write SCR for
4879 * @reg: SCR to write
4880 * @val: value to write
4882 * Write @val to SCR register @reg of @ap. This function is
4883 * guaranteed to succeed if the cable type of the port is SATA
4884 * and the port implements ->scr_read.
4890 * 0 on success, negative errno on failure.
4892 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4894 if (sata_scr_valid(ap
)) {
4895 ap
->ops
->scr_write(ap
, reg
, val
);
4902 * sata_scr_write_flush - write SCR register of the specified port and flush
4903 * @ap: ATA port to write SCR for
4904 * @reg: SCR to write
4905 * @val: value to write
4907 * This function is identical to sata_scr_write() except that this
4908 * function performs flush after writing to the register.
4914 * 0 on success, negative errno on failure.
4916 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4918 if (sata_scr_valid(ap
)) {
4919 ap
->ops
->scr_write(ap
, reg
, val
);
4920 ap
->ops
->scr_read(ap
, reg
);
4927 * ata_port_online - test whether the given port is online
4928 * @ap: ATA port to test
4930 * Test whether @ap is online. Note that this function returns 0
4931 * if online status of @ap cannot be obtained, so
4932 * ata_port_online(ap) != !ata_port_offline(ap).
4938 * 1 if the port online status is available and online.
4940 int ata_port_online(struct ata_port
*ap
)
4944 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4950 * ata_port_offline - test whether the given port is offline
4951 * @ap: ATA port to test
4953 * Test whether @ap is offline. Note that this function returns
4954 * 0 if offline status of @ap cannot be obtained, so
4955 * ata_port_online(ap) != !ata_port_offline(ap).
4961 * 1 if the port offline status is available and offline.
4963 int ata_port_offline(struct ata_port
*ap
)
4967 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4972 static int ata_flush_cache(struct ata_device
*dev
)
4976 if (!ata_try_flush_cache(dev
))
4979 if (ata_id_has_flush_ext(dev
->id
))
4980 cmd
= ATA_CMD_FLUSH_EXT
;
4982 cmd
= ATA_CMD_FLUSH
;
4984 return ata_do_simple_cmd(dev
, cmd
);
4987 static int ata_standby_drive(struct ata_device
*dev
)
4989 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4992 static int ata_start_drive(struct ata_device
*dev
)
4994 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4998 * ata_device_resume - wakeup a previously suspended devices
4999 * @dev: the device to resume
5001 * Kick the drive back into action, by sending it an idle immediate
5002 * command and making sure its transfer mode matches between drive
5006 int ata_device_resume(struct ata_device
*dev
)
5008 struct ata_port
*ap
= dev
->ap
;
5010 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
5011 struct ata_device
*failed_dev
;
5013 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
5014 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
5016 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
5017 while (ata_set_mode(ap
, &failed_dev
))
5018 ata_dev_disable(failed_dev
);
5020 if (!ata_dev_enabled(dev
))
5022 if (dev
->class == ATA_DEV_ATA
)
5023 ata_start_drive(dev
);
5029 * ata_device_suspend - prepare a device for suspend
5030 * @dev: the device to suspend
5031 * @state: target power management state
5033 * Flush the cache on the drive, if appropriate, then issue a
5034 * standbynow command.
5036 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5038 struct ata_port
*ap
= dev
->ap
;
5040 if (!ata_dev_enabled(dev
))
5042 if (dev
->class == ATA_DEV_ATA
)
5043 ata_flush_cache(dev
);
5045 if (state
.event
!= PM_EVENT_FREEZE
)
5046 ata_standby_drive(dev
);
5047 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5052 * ata_port_start - Set port up for dma.
5053 * @ap: Port to initialize
5055 * Called just after data structures for each port are
5056 * initialized. Allocates space for PRD table.
5058 * May be used as the port_start() entry in ata_port_operations.
5061 * Inherited from caller.
5064 int ata_port_start (struct ata_port
*ap
)
5066 struct device
*dev
= ap
->dev
;
5069 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5073 rc
= ata_pad_alloc(ap
, dev
);
5075 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5079 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5086 * ata_port_stop - Undo ata_port_start()
5087 * @ap: Port to shut down
5089 * Frees the PRD table.
5091 * May be used as the port_stop() entry in ata_port_operations.
5094 * Inherited from caller.
5097 void ata_port_stop (struct ata_port
*ap
)
5099 struct device
*dev
= ap
->dev
;
5101 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5102 ata_pad_free(ap
, dev
);
5105 void ata_host_stop (struct ata_host_set
*host_set
)
5107 if (host_set
->mmio_base
)
5108 iounmap(host_set
->mmio_base
);
5113 * ata_host_remove - Unregister SCSI host structure with upper layers
5114 * @ap: Port to unregister
5115 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5118 * Inherited from caller.
5121 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5123 struct Scsi_Host
*sh
= ap
->host
;
5128 scsi_remove_host(sh
);
5130 ap
->ops
->port_stop(ap
);
5134 * ata_dev_init - Initialize an ata_device structure
5135 * @dev: Device structure to initialize
5137 * Initialize @dev in preparation for probing.
5140 * Inherited from caller.
5142 void ata_dev_init(struct ata_device
*dev
)
5144 struct ata_port
*ap
= dev
->ap
;
5145 unsigned long flags
;
5147 /* SATA spd limit is bound to the first device */
5148 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5150 /* High bits of dev->flags are used to record warm plug
5151 * requests which occur asynchronously. Synchronize using
5154 spin_lock_irqsave(ap
->lock
, flags
);
5155 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5156 spin_unlock_irqrestore(ap
->lock
, flags
);
5158 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5159 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5160 dev
->pio_mask
= UINT_MAX
;
5161 dev
->mwdma_mask
= UINT_MAX
;
5162 dev
->udma_mask
= UINT_MAX
;
5166 * ata_host_init - Initialize an ata_port structure
5167 * @ap: Structure to initialize
5168 * @host: associated SCSI mid-layer structure
5169 * @host_set: Collection of hosts to which @ap belongs
5170 * @ent: Probe information provided by low-level driver
5171 * @port_no: Port number associated with this ata_port
5173 * Initialize a new ata_port structure, and its associated
5177 * Inherited from caller.
5179 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5180 struct ata_host_set
*host_set
,
5181 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5187 host
->max_channel
= 1;
5188 host
->unique_id
= ata_unique_id
++;
5189 host
->max_cmd_len
= 12;
5191 ap
->lock
= &host_set
->lock
;
5192 ap
->flags
= ATA_FLAG_DISABLED
;
5193 ap
->id
= host
->unique_id
;
5195 ap
->ctl
= ATA_DEVCTL_OBS
;
5196 ap
->host_set
= host_set
;
5198 ap
->port_no
= port_no
;
5200 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5201 ap
->pio_mask
= ent
->pio_mask
;
5202 ap
->mwdma_mask
= ent
->mwdma_mask
;
5203 ap
->udma_mask
= ent
->udma_mask
;
5204 ap
->flags
|= ent
->host_flags
;
5205 ap
->ops
= ent
->port_ops
;
5206 ap
->hw_sata_spd_limit
= UINT_MAX
;
5207 ap
->active_tag
= ATA_TAG_POISON
;
5208 ap
->last_ctl
= 0xFF;
5210 #if defined(ATA_VERBOSE_DEBUG)
5211 /* turn on all debugging levels */
5212 ap
->msg_enable
= 0x00FF;
5213 #elif defined(ATA_DEBUG)
5214 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5216 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5219 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5220 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5221 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5222 INIT_LIST_HEAD(&ap
->eh_done_q
);
5223 init_waitqueue_head(&ap
->eh_wait_q
);
5225 /* set cable type */
5226 ap
->cbl
= ATA_CBL_NONE
;
5227 if (ap
->flags
& ATA_FLAG_SATA
)
5228 ap
->cbl
= ATA_CBL_SATA
;
5230 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5231 struct ata_device
*dev
= &ap
->device
[i
];
5238 ap
->stats
.unhandled_irq
= 1;
5239 ap
->stats
.idle_irq
= 1;
5242 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5246 * ata_host_add - Attach low-level ATA driver to system
5247 * @ent: Information provided by low-level driver
5248 * @host_set: Collections of ports to which we add
5249 * @port_no: Port number associated with this host
5251 * Attach low-level ATA driver to system.
5254 * PCI/etc. bus probe sem.
5257 * New ata_port on success, for NULL on error.
5260 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5261 struct ata_host_set
*host_set
,
5262 unsigned int port_no
)
5264 struct Scsi_Host
*host
;
5265 struct ata_port
*ap
;
5270 if (!ent
->port_ops
->error_handler
&&
5271 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5272 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5277 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5281 host
->transportt
= &ata_scsi_transport_template
;
5283 ap
= ata_shost_to_port(host
);
5285 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5287 rc
= ap
->ops
->port_start(ap
);
5294 scsi_host_put(host
);
5299 * ata_device_add - Register hardware device with ATA and SCSI layers
5300 * @ent: Probe information describing hardware device to be registered
5302 * This function processes the information provided in the probe
5303 * information struct @ent, allocates the necessary ATA and SCSI
5304 * host information structures, initializes them, and registers
5305 * everything with requisite kernel subsystems.
5307 * This function requests irqs, probes the ATA bus, and probes
5311 * PCI/etc. bus probe sem.
5314 * Number of ports registered. Zero on error (no ports registered).
5316 int ata_device_add(const struct ata_probe_ent
*ent
)
5318 unsigned int count
= 0, i
;
5319 struct device
*dev
= ent
->dev
;
5320 struct ata_host_set
*host_set
;
5324 /* alloc a container for our list of ATA ports (buses) */
5325 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5326 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5329 spin_lock_init(&host_set
->lock
);
5331 host_set
->dev
= dev
;
5332 host_set
->n_ports
= ent
->n_ports
;
5333 host_set
->irq
= ent
->irq
;
5334 host_set
->mmio_base
= ent
->mmio_base
;
5335 host_set
->private_data
= ent
->private_data
;
5336 host_set
->ops
= ent
->port_ops
;
5337 host_set
->flags
= ent
->host_set_flags
;
5339 /* register each port bound to this device */
5340 for (i
= 0; i
< ent
->n_ports
; i
++) {
5341 struct ata_port
*ap
;
5342 unsigned long xfer_mode_mask
;
5344 ap
= ata_host_add(ent
, host_set
, i
);
5348 host_set
->ports
[i
] = ap
;
5349 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5350 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5351 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5353 /* print per-port info to dmesg */
5354 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5355 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5356 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5357 ata_mode_string(xfer_mode_mask
),
5358 ap
->ioaddr
.cmd_addr
,
5359 ap
->ioaddr
.ctl_addr
,
5360 ap
->ioaddr
.bmdma_addr
,
5364 host_set
->ops
->irq_clear(ap
);
5365 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5372 /* obtain irq, that is shared between channels */
5373 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5374 DRV_NAME
, host_set
);
5376 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5381 /* perform each probe synchronously */
5382 DPRINTK("probe begin\n");
5383 for (i
= 0; i
< count
; i
++) {
5384 struct ata_port
*ap
;
5388 ap
= host_set
->ports
[i
];
5390 /* init sata_spd_limit to the current value */
5391 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5392 int spd
= (scontrol
>> 4) & 0xf;
5393 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5395 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5397 rc
= scsi_add_host(ap
->host
, dev
);
5399 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5400 /* FIXME: do something useful here */
5401 /* FIXME: handle unconditional calls to
5402 * scsi_scan_host and ata_host_remove, below,
5407 if (ap
->ops
->error_handler
) {
5408 unsigned long flags
;
5412 /* kick EH for boot probing */
5413 spin_lock_irqsave(ap
->lock
, flags
);
5415 ap
->eh_info
.probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5416 ap
->eh_info
.action
|= ATA_EH_SOFTRESET
;
5418 ap
->flags
|= ATA_FLAG_LOADING
;
5419 ata_port_schedule_eh(ap
);
5421 spin_unlock_irqrestore(ap
->lock
, flags
);
5423 /* wait for EH to finish */
5424 ata_port_wait_eh(ap
);
5426 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5427 rc
= ata_bus_probe(ap
);
5428 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5431 /* FIXME: do something useful here?
5432 * Current libata behavior will
5433 * tear down everything when
5434 * the module is removed
5435 * or the h/w is unplugged.
5441 /* probes are done, now scan each port's disk(s) */
5442 DPRINTK("host probe begin\n");
5443 for (i
= 0; i
< count
; i
++) {
5444 struct ata_port
*ap
= host_set
->ports
[i
];
5446 ata_scsi_scan_host(ap
);
5449 dev_set_drvdata(dev
, host_set
);
5451 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5452 return ent
->n_ports
; /* success */
5455 for (i
= 0; i
< count
; i
++) {
5456 ata_host_remove(host_set
->ports
[i
], 1);
5457 scsi_host_put(host_set
->ports
[i
]->host
);
5461 VPRINTK("EXIT, returning 0\n");
5466 * ata_port_detach - Detach ATA port in prepration of device removal
5467 * @ap: ATA port to be detached
5469 * Detach all ATA devices and the associated SCSI devices of @ap;
5470 * then, remove the associated SCSI host. @ap is guaranteed to
5471 * be quiescent on return from this function.
5474 * Kernel thread context (may sleep).
5476 void ata_port_detach(struct ata_port
*ap
)
5478 unsigned long flags
;
5481 if (!ap
->ops
->error_handler
)
5484 /* tell EH we're leaving & flush EH */
5485 spin_lock_irqsave(ap
->lock
, flags
);
5486 ap
->flags
|= ATA_FLAG_UNLOADING
;
5487 spin_unlock_irqrestore(ap
->lock
, flags
);
5489 ata_port_wait_eh(ap
);
5491 /* EH is now guaranteed to see UNLOADING, so no new device
5492 * will be attached. Disable all existing devices.
5494 spin_lock_irqsave(ap
->lock
, flags
);
5496 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5497 ata_dev_disable(&ap
->device
[i
]);
5499 spin_unlock_irqrestore(ap
->lock
, flags
);
5501 /* Final freeze & EH. All in-flight commands are aborted. EH
5502 * will be skipped and retrials will be terminated with bad
5505 spin_lock_irqsave(ap
->lock
, flags
);
5506 ata_port_freeze(ap
); /* won't be thawed */
5507 spin_unlock_irqrestore(ap
->lock
, flags
);
5509 ata_port_wait_eh(ap
);
5511 /* Flush hotplug task. The sequence is similar to
5512 * ata_port_flush_task().
5514 flush_workqueue(ata_aux_wq
);
5515 cancel_delayed_work(&ap
->hotplug_task
);
5516 flush_workqueue(ata_aux_wq
);
5518 /* remove the associated SCSI host */
5519 scsi_remove_host(ap
->host
);
5523 * ata_host_set_remove - PCI layer callback for device removal
5524 * @host_set: ATA host set that was removed
5526 * Unregister all objects associated with this host set. Free those
5530 * Inherited from calling layer (may sleep).
5533 void ata_host_set_remove(struct ata_host_set
*host_set
)
5537 for (i
= 0; i
< host_set
->n_ports
; i
++)
5538 ata_port_detach(host_set
->ports
[i
]);
5540 free_irq(host_set
->irq
, host_set
);
5542 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5543 struct ata_port
*ap
= host_set
->ports
[i
];
5545 ata_scsi_release(ap
->host
);
5547 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5548 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5550 if (ioaddr
->cmd_addr
== 0x1f0)
5551 release_region(0x1f0, 8);
5552 else if (ioaddr
->cmd_addr
== 0x170)
5553 release_region(0x170, 8);
5556 scsi_host_put(ap
->host
);
5559 if (host_set
->ops
->host_stop
)
5560 host_set
->ops
->host_stop(host_set
);
5566 * ata_scsi_release - SCSI layer callback hook for host unload
5567 * @host: libata host to be unloaded
5569 * Performs all duties necessary to shut down a libata port...
5570 * Kill port kthread, disable port, and release resources.
5573 * Inherited from SCSI layer.
5579 int ata_scsi_release(struct Scsi_Host
*host
)
5581 struct ata_port
*ap
= ata_shost_to_port(host
);
5585 ap
->ops
->port_disable(ap
);
5586 ata_host_remove(ap
, 0);
5593 * ata_std_ports - initialize ioaddr with standard port offsets.
5594 * @ioaddr: IO address structure to be initialized
5596 * Utility function which initializes data_addr, error_addr,
5597 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5598 * device_addr, status_addr, and command_addr to standard offsets
5599 * relative to cmd_addr.
5601 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5604 void ata_std_ports(struct ata_ioports
*ioaddr
)
5606 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5607 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5608 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5609 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5610 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5611 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5612 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5613 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5614 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5615 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5621 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5623 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5625 pci_iounmap(pdev
, host_set
->mmio_base
);
5629 * ata_pci_remove_one - PCI layer callback for device removal
5630 * @pdev: PCI device that was removed
5632 * PCI layer indicates to libata via this hook that
5633 * hot-unplug or module unload event has occurred.
5634 * Handle this by unregistering all objects associated
5635 * with this PCI device. Free those objects. Then finally
5636 * release PCI resources and disable device.
5639 * Inherited from PCI layer (may sleep).
5642 void ata_pci_remove_one (struct pci_dev
*pdev
)
5644 struct device
*dev
= pci_dev_to_dev(pdev
);
5645 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5646 struct ata_host_set
*host_set2
= host_set
->next
;
5648 ata_host_set_remove(host_set
);
5650 ata_host_set_remove(host_set2
);
5652 pci_release_regions(pdev
);
5653 pci_disable_device(pdev
);
5654 dev_set_drvdata(dev
, NULL
);
5657 /* move to PCI subsystem */
5658 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5660 unsigned long tmp
= 0;
5662 switch (bits
->width
) {
5665 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5671 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5677 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5688 return (tmp
== bits
->val
) ? 1 : 0;
5691 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5693 pci_save_state(pdev
);
5694 pci_disable_device(pdev
);
5695 pci_set_power_state(pdev
, PCI_D3hot
);
5699 int ata_pci_device_resume(struct pci_dev
*pdev
)
5701 pci_set_power_state(pdev
, PCI_D0
);
5702 pci_restore_state(pdev
);
5703 pci_enable_device(pdev
);
5704 pci_set_master(pdev
);
5707 #endif /* CONFIG_PCI */
5710 static int __init
ata_init(void)
5712 ata_wq
= create_workqueue("ata");
5716 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5718 destroy_workqueue(ata_wq
);
5722 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5726 static void __exit
ata_exit(void)
5728 destroy_workqueue(ata_wq
);
5729 destroy_workqueue(ata_aux_wq
);
5732 module_init(ata_init
);
5733 module_exit(ata_exit
);
5735 static unsigned long ratelimit_time
;
5736 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5738 int ata_ratelimit(void)
5741 unsigned long flags
;
5743 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5745 if (time_after(jiffies
, ratelimit_time
)) {
5747 ratelimit_time
= jiffies
+ (HZ
/5);
5751 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5757 * ata_wait_register - wait until register value changes
5758 * @reg: IO-mapped register
5759 * @mask: Mask to apply to read register value
5760 * @val: Wait condition
5761 * @interval_msec: polling interval in milliseconds
5762 * @timeout_msec: timeout in milliseconds
5764 * Waiting for some bits of register to change is a common
5765 * operation for ATA controllers. This function reads 32bit LE
5766 * IO-mapped register @reg and tests for the following condition.
5768 * (*@reg & mask) != val
5770 * If the condition is met, it returns; otherwise, the process is
5771 * repeated after @interval_msec until timeout.
5774 * Kernel thread context (may sleep)
5777 * The final register value.
5779 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5780 unsigned long interval_msec
,
5781 unsigned long timeout_msec
)
5783 unsigned long timeout
;
5786 tmp
= ioread32(reg
);
5788 /* Calculate timeout _after_ the first read to make sure
5789 * preceding writes reach the controller before starting to
5790 * eat away the timeout.
5792 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5794 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5795 msleep(interval_msec
);
5796 tmp
= ioread32(reg
);
5803 * libata is essentially a library of internal helper functions for
5804 * low-level ATA host controller drivers. As such, the API/ABI is
5805 * likely to change as new drivers are added and updated.
5806 * Do not depend on ABI/API stability.
5809 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5810 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5811 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5812 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5813 EXPORT_SYMBOL_GPL(ata_std_ports
);
5814 EXPORT_SYMBOL_GPL(ata_device_add
);
5815 EXPORT_SYMBOL_GPL(ata_port_detach
);
5816 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5817 EXPORT_SYMBOL_GPL(ata_sg_init
);
5818 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5819 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5820 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5821 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5822 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5823 EXPORT_SYMBOL_GPL(ata_tf_load
);
5824 EXPORT_SYMBOL_GPL(ata_tf_read
);
5825 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5826 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5827 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5828 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5829 EXPORT_SYMBOL_GPL(ata_check_status
);
5830 EXPORT_SYMBOL_GPL(ata_altstatus
);
5831 EXPORT_SYMBOL_GPL(ata_exec_command
);
5832 EXPORT_SYMBOL_GPL(ata_port_start
);
5833 EXPORT_SYMBOL_GPL(ata_port_stop
);
5834 EXPORT_SYMBOL_GPL(ata_host_stop
);
5835 EXPORT_SYMBOL_GPL(ata_interrupt
);
5836 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5837 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5838 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5839 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5840 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5841 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5842 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5843 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5844 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5845 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5846 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5847 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5848 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5849 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5850 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5851 EXPORT_SYMBOL_GPL(ata_port_probe
);
5852 EXPORT_SYMBOL_GPL(sata_set_spd
);
5853 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5854 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5855 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5856 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5857 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5858 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5859 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5860 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5861 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5862 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5863 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5864 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5865 EXPORT_SYMBOL_GPL(ata_port_disable
);
5866 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5867 EXPORT_SYMBOL_GPL(ata_wait_register
);
5868 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5869 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5870 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5871 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5872 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5873 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5874 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5875 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5876 EXPORT_SYMBOL_GPL(ata_host_intr
);
5877 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5878 EXPORT_SYMBOL_GPL(sata_scr_read
);
5879 EXPORT_SYMBOL_GPL(sata_scr_write
);
5880 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5881 EXPORT_SYMBOL_GPL(ata_port_online
);
5882 EXPORT_SYMBOL_GPL(ata_port_offline
);
5883 EXPORT_SYMBOL_GPL(ata_id_string
);
5884 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5885 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5887 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5888 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5889 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5892 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5893 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5894 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5895 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5896 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5897 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5898 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5899 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5900 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5901 #endif /* CONFIG_PCI */
5903 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5904 EXPORT_SYMBOL_GPL(ata_device_resume
);
5905 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5906 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5908 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5909 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5910 EXPORT_SYMBOL_GPL(ata_port_abort
);
5911 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5912 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5913 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5914 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5915 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5916 EXPORT_SYMBOL_GPL(ata_do_eh
);