2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 /* debounce timing parameters in msecs { interval, duration, timeout } */
65 const unsigned long sata_deb_timing_boot
[] = { 5, 100, 2000 };
66 const unsigned long sata_deb_timing_eh
[] = { 25, 500, 2000 };
67 const unsigned long sata_deb_timing_before_fsrst
[] = { 100, 2000, 5000 };
69 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
70 u16 heads
, u16 sectors
);
71 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
72 static void ata_dev_xfermask(struct ata_device
*dev
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 struct workqueue_struct
*ata_aux_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param(atapi_dmadir
, int, 0444);
85 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
88 module_param_named(fua
, libata_fua
, int, 0444);
89 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
91 MODULE_AUTHOR("Jeff Garzik");
92 MODULE_DESCRIPTION("Library module for ATA devices");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(DRV_VERSION
);
98 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
99 * @tf: Taskfile to convert
100 * @fis: Buffer into which data will output
101 * @pmp: Port multiplier port
103 * Converts a standard ATA taskfile to a Serial ATA
104 * FIS structure (Register - Host to Device).
107 * Inherited from caller.
110 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
112 fis
[0] = 0x27; /* Register - Host to Device FIS */
113 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
114 bit 7 indicates Command FIS */
115 fis
[2] = tf
->command
;
116 fis
[3] = tf
->feature
;
123 fis
[8] = tf
->hob_lbal
;
124 fis
[9] = tf
->hob_lbam
;
125 fis
[10] = tf
->hob_lbah
;
126 fis
[11] = tf
->hob_feature
;
129 fis
[13] = tf
->hob_nsect
;
140 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
141 * @fis: Buffer from which data will be input
142 * @tf: Taskfile to output
144 * Converts a serial ATA FIS structure to a standard ATA taskfile.
147 * Inherited from caller.
150 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
152 tf
->command
= fis
[2]; /* status */
153 tf
->feature
= fis
[3]; /* error */
160 tf
->hob_lbal
= fis
[8];
161 tf
->hob_lbam
= fis
[9];
162 tf
->hob_lbah
= fis
[10];
165 tf
->hob_nsect
= fis
[13];
168 static const u8 ata_rw_cmds
[] = {
172 ATA_CMD_READ_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_EXT
,
177 ATA_CMD_WRITE_MULTI_FUA_EXT
,
181 ATA_CMD_PIO_READ_EXT
,
182 ATA_CMD_PIO_WRITE_EXT
,
195 ATA_CMD_WRITE_FUA_EXT
199 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
200 * @qc: command to examine and configure
202 * Examine the device configuration and tf->flags to calculate
203 * the proper read/write commands and protocol to use.
208 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
210 struct ata_taskfile
*tf
= &qc
->tf
;
211 struct ata_device
*dev
= qc
->dev
;
214 int index
, fua
, lba48
, write
;
216 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
217 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
218 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
220 if (dev
->flags
& ATA_DFLAG_PIO
) {
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
223 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
224 /* Unable to use DMA due to host limitation */
225 tf
->protocol
= ATA_PROT_PIO
;
226 index
= dev
->multi_count
? 0 : 8;
228 tf
->protocol
= ATA_PROT_DMA
;
232 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
241 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
242 * @pio_mask: pio_mask
243 * @mwdma_mask: mwdma_mask
244 * @udma_mask: udma_mask
246 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
247 * unsigned int xfer_mask.
255 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
256 unsigned int mwdma_mask
,
257 unsigned int udma_mask
)
259 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
260 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
261 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
265 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
266 * @xfer_mask: xfer_mask to unpack
267 * @pio_mask: resulting pio_mask
268 * @mwdma_mask: resulting mwdma_mask
269 * @udma_mask: resulting udma_mask
271 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
272 * Any NULL distination masks will be ignored.
274 static void ata_unpack_xfermask(unsigned int xfer_mask
,
275 unsigned int *pio_mask
,
276 unsigned int *mwdma_mask
,
277 unsigned int *udma_mask
)
280 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
282 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
284 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
287 static const struct ata_xfer_ent
{
291 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
292 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
293 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
298 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
299 * @xfer_mask: xfer_mask of interest
301 * Return matching XFER_* value for @xfer_mask. Only the highest
302 * bit of @xfer_mask is considered.
308 * Matching XFER_* value, 0 if no match found.
310 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
312 int highbit
= fls(xfer_mask
) - 1;
313 const struct ata_xfer_ent
*ent
;
315 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
316 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
317 return ent
->base
+ highbit
- ent
->shift
;
322 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
323 * @xfer_mode: XFER_* of interest
325 * Return matching xfer_mask for @xfer_mode.
331 * Matching xfer_mask, 0 if no match found.
333 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
335 const struct ata_xfer_ent
*ent
;
337 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
338 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
339 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
344 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
345 * @xfer_mode: XFER_* of interest
347 * Return matching xfer_shift for @xfer_mode.
353 * Matching xfer_shift, -1 if no match found.
355 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
357 const struct ata_xfer_ent
*ent
;
359 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
360 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
366 * ata_mode_string - convert xfer_mask to string
367 * @xfer_mask: mask of bits supported; only highest bit counts.
369 * Determine string which represents the highest speed
370 * (highest bit in @modemask).
376 * Constant C string representing highest speed listed in
377 * @mode_mask, or the constant C string "<n/a>".
379 static const char *ata_mode_string(unsigned int xfer_mask
)
381 static const char * const xfer_mode_str
[] = {
401 highbit
= fls(xfer_mask
) - 1;
402 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
403 return xfer_mode_str
[highbit
];
407 static const char *sata_spd_string(unsigned int spd
)
409 static const char * const spd_str
[] = {
414 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
416 return spd_str
[spd
- 1];
419 void ata_dev_disable(struct ata_device
*dev
)
421 if (ata_dev_enabled(dev
) && ata_msg_drv(dev
->ap
)) {
422 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
428 * ata_pio_devchk - PATA device presence detection
429 * @ap: ATA channel to examine
430 * @device: Device to examine (starting at zero)
432 * This technique was originally described in
433 * Hale Landis's ATADRVR (www.ata-atapi.com), and
434 * later found its way into the ATA/ATAPI spec.
436 * Write a pattern to the ATA shadow registers,
437 * and if a device is present, it will respond by
438 * correctly storing and echoing back the
439 * ATA shadow register contents.
445 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
448 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
451 ap
->ops
->dev_select(ap
, device
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 outb(0xaa, ioaddr
->nsect_addr
);
457 outb(0x55, ioaddr
->lbal_addr
);
459 outb(0x55, ioaddr
->nsect_addr
);
460 outb(0xaa, ioaddr
->lbal_addr
);
462 nsect
= inb(ioaddr
->nsect_addr
);
463 lbal
= inb(ioaddr
->lbal_addr
);
465 if ((nsect
== 0x55) && (lbal
== 0xaa))
466 return 1; /* we found a device */
468 return 0; /* nothing found */
472 * ata_mmio_devchk - PATA device presence detection
473 * @ap: ATA channel to examine
474 * @device: Device to examine (starting at zero)
476 * This technique was originally described in
477 * Hale Landis's ATADRVR (www.ata-atapi.com), and
478 * later found its way into the ATA/ATAPI spec.
480 * Write a pattern to the ATA shadow registers,
481 * and if a device is present, it will respond by
482 * correctly storing and echoing back the
483 * ATA shadow register contents.
489 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
492 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
495 ap
->ops
->dev_select(ap
, device
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
503 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
506 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
507 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
509 if ((nsect
== 0x55) && (lbal
== 0xaa))
510 return 1; /* we found a device */
512 return 0; /* nothing found */
516 * ata_devchk - PATA device presence detection
517 * @ap: ATA channel to examine
518 * @device: Device to examine (starting at zero)
520 * Dispatch ATA device presence detection, depending
521 * on whether we are using PIO or MMIO to talk to the
522 * ATA shadow registers.
528 static unsigned int ata_devchk(struct ata_port
*ap
,
531 if (ap
->flags
& ATA_FLAG_MMIO
)
532 return ata_mmio_devchk(ap
, device
);
533 return ata_pio_devchk(ap
, device
);
537 * ata_dev_classify - determine device type based on ATA-spec signature
538 * @tf: ATA taskfile register set for device to be identified
540 * Determine from taskfile register contents whether a device is
541 * ATA or ATAPI, as per "Signature and persistence" section
542 * of ATA/PI spec (volume 1, sect 5.14).
548 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
549 * the event of failure.
552 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
554 /* Apple's open source Darwin code hints that some devices only
555 * put a proper signature into the LBA mid/high registers,
556 * So, we only check those. It's sufficient for uniqueness.
559 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
560 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
561 DPRINTK("found ATA device by sig\n");
565 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
566 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
567 DPRINTK("found ATAPI device by sig\n");
568 return ATA_DEV_ATAPI
;
571 DPRINTK("unknown device\n");
572 return ATA_DEV_UNKNOWN
;
576 * ata_dev_try_classify - Parse returned ATA device signature
577 * @ap: ATA channel to examine
578 * @device: Device to examine (starting at zero)
579 * @r_err: Value of error register on completion
581 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
582 * an ATA/ATAPI-defined set of values is placed in the ATA
583 * shadow registers, indicating the results of device detection
586 * Select the ATA device, and read the values from the ATA shadow
587 * registers. Then parse according to the Error register value,
588 * and the spec-defined values examined by ata_dev_classify().
594 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
598 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
600 struct ata_taskfile tf
;
604 ap
->ops
->dev_select(ap
, device
);
606 memset(&tf
, 0, sizeof(tf
));
608 ap
->ops
->tf_read(ap
, &tf
);
613 /* see if device passed diags */
616 else if ((device
== 0) && (err
== 0x81))
621 /* determine if device is ATA or ATAPI */
622 class = ata_dev_classify(&tf
);
624 if (class == ATA_DEV_UNKNOWN
)
626 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
632 * ata_id_string - Convert IDENTIFY DEVICE page into string
633 * @id: IDENTIFY DEVICE results we will examine
634 * @s: string into which data is output
635 * @ofs: offset into identify device page
636 * @len: length of string to return. must be an even number.
638 * The strings in the IDENTIFY DEVICE page are broken up into
639 * 16-bit chunks. Run through the string, and output each
640 * 8-bit chunk linearly, regardless of platform.
646 void ata_id_string(const u16
*id
, unsigned char *s
,
647 unsigned int ofs
, unsigned int len
)
666 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
667 * @id: IDENTIFY DEVICE results we will examine
668 * @s: string into which data is output
669 * @ofs: offset into identify device page
670 * @len: length of string to return. must be an odd number.
672 * This function is identical to ata_id_string except that it
673 * trims trailing spaces and terminates the resulting string with
674 * null. @len must be actual maximum length (even number) + 1.
679 void ata_id_c_string(const u16
*id
, unsigned char *s
,
680 unsigned int ofs
, unsigned int len
)
686 ata_id_string(id
, s
, ofs
, len
- 1);
688 p
= s
+ strnlen(s
, len
- 1);
689 while (p
> s
&& p
[-1] == ' ')
694 static u64
ata_id_n_sectors(const u16
*id
)
696 if (ata_id_has_lba(id
)) {
697 if (ata_id_has_lba48(id
))
698 return ata_id_u64(id
, 100);
700 return ata_id_u32(id
, 60);
702 if (ata_id_current_chs_valid(id
))
703 return ata_id_u32(id
, 57);
705 return id
[1] * id
[3] * id
[6];
710 * ata_noop_dev_select - Select device 0/1 on ATA bus
711 * @ap: ATA channel to manipulate
712 * @device: ATA device (numbered from zero) to select
714 * This function performs no actual function.
716 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
727 * ata_std_dev_select - Select device 0/1 on ATA bus
728 * @ap: ATA channel to manipulate
729 * @device: ATA device (numbered from zero) to select
731 * Use the method defined in the ATA specification to
732 * make either device 0, or device 1, active on the
733 * ATA channel. Works with both PIO and MMIO.
735 * May be used as the dev_select() entry in ata_port_operations.
741 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
746 tmp
= ATA_DEVICE_OBS
;
748 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
750 if (ap
->flags
& ATA_FLAG_MMIO
) {
751 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
753 outb(tmp
, ap
->ioaddr
.device_addr
);
755 ata_pause(ap
); /* needed; also flushes, for mmio */
759 * ata_dev_select - Select device 0/1 on ATA bus
760 * @ap: ATA channel to manipulate
761 * @device: ATA device (numbered from zero) to select
762 * @wait: non-zero to wait for Status register BSY bit to clear
763 * @can_sleep: non-zero if context allows sleeping
765 * Use the method defined in the ATA specification to
766 * make either device 0, or device 1, active on the
769 * This is a high-level version of ata_std_dev_select(),
770 * which additionally provides the services of inserting
771 * the proper pauses and status polling, where needed.
777 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
778 unsigned int wait
, unsigned int can_sleep
)
780 if (ata_msg_probe(ap
)) {
781 ata_port_printk(ap
, KERN_INFO
, "ata_dev_select: ENTER, ata%u: "
782 "device %u, wait %u\n",
783 ap
->id
, device
, wait
);
789 ap
->ops
->dev_select(ap
, device
);
792 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
799 * ata_dump_id - IDENTIFY DEVICE info debugging output
800 * @id: IDENTIFY DEVICE page to dump
802 * Dump selected 16-bit words from the given IDENTIFY DEVICE
809 static inline void ata_dump_id(const u16
*id
)
811 DPRINTK("49==0x%04x "
821 DPRINTK("80==0x%04x "
831 DPRINTK("88==0x%04x "
838 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
839 * @id: IDENTIFY data to compute xfer mask from
841 * Compute the xfermask for this device. This is not as trivial
842 * as it seems if we must consider early devices correctly.
844 * FIXME: pre IDE drive timing (do we care ?).
852 static unsigned int ata_id_xfermask(const u16
*id
)
854 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
856 /* Usual case. Word 53 indicates word 64 is valid */
857 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
858 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
862 /* If word 64 isn't valid then Word 51 high byte holds
863 * the PIO timing number for the maximum. Turn it into
866 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
868 /* But wait.. there's more. Design your standards by
869 * committee and you too can get a free iordy field to
870 * process. However its the speeds not the modes that
871 * are supported... Note drivers using the timing API
872 * will get this right anyway
876 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
879 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
880 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
882 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
886 * ata_port_queue_task - Queue port_task
887 * @ap: The ata_port to queue port_task for
888 * @fn: workqueue function to be scheduled
889 * @data: data value to pass to workqueue function
890 * @delay: delay time for workqueue function
892 * Schedule @fn(@data) for execution after @delay jiffies using
893 * port_task. There is one port_task per port and it's the
894 * user(low level driver)'s responsibility to make sure that only
895 * one task is active at any given time.
897 * libata core layer takes care of synchronization between
898 * port_task and EH. ata_port_queue_task() may be ignored for EH
902 * Inherited from caller.
904 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
909 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
912 PREPARE_WORK(&ap
->port_task
, fn
, data
);
915 rc
= queue_work(ata_wq
, &ap
->port_task
);
917 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
919 /* rc == 0 means that another user is using port task */
924 * ata_port_flush_task - Flush port_task
925 * @ap: The ata_port to flush port_task for
927 * After this function completes, port_task is guranteed not to
928 * be running or scheduled.
931 * Kernel thread context (may sleep)
933 void ata_port_flush_task(struct ata_port
*ap
)
939 spin_lock_irqsave(ap
->lock
, flags
);
940 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
941 spin_unlock_irqrestore(ap
->lock
, flags
);
943 DPRINTK("flush #1\n");
944 flush_workqueue(ata_wq
);
947 * At this point, if a task is running, it's guaranteed to see
948 * the FLUSH flag; thus, it will never queue pio tasks again.
951 if (!cancel_delayed_work(&ap
->port_task
)) {
953 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n", __FUNCTION__
);
954 flush_workqueue(ata_wq
);
957 spin_lock_irqsave(ap
->lock
, flags
);
958 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
959 spin_unlock_irqrestore(ap
->lock
, flags
);
962 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
965 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
967 struct completion
*waiting
= qc
->private_data
;
973 * ata_exec_internal - execute libata internal command
974 * @dev: Device to which the command is sent
975 * @tf: Taskfile registers for the command and the result
976 * @cdb: CDB for packet command
977 * @dma_dir: Data tranfer direction of the command
978 * @buf: Data buffer of the command
979 * @buflen: Length of data buffer
981 * Executes libata internal command with timeout. @tf contains
982 * command on entry and result on return. Timeout and error
983 * conditions are reported via return value. No recovery action
984 * is taken after a command times out. It's caller's duty to
985 * clean up after timeout.
988 * None. Should be called with kernel context, might sleep.
991 * Zero on success, AC_ERR_* mask on failure
993 unsigned ata_exec_internal(struct ata_device
*dev
,
994 struct ata_taskfile
*tf
, const u8
*cdb
,
995 int dma_dir
, void *buf
, unsigned int buflen
)
997 struct ata_port
*ap
= dev
->ap
;
998 u8 command
= tf
->command
;
999 struct ata_queued_cmd
*qc
;
1000 unsigned int tag
, preempted_tag
;
1001 u32 preempted_sactive
, preempted_qc_active
;
1002 DECLARE_COMPLETION(wait
);
1003 unsigned long flags
;
1004 unsigned int err_mask
;
1007 spin_lock_irqsave(ap
->lock
, flags
);
1009 /* no internal command while frozen */
1010 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1011 spin_unlock_irqrestore(ap
->lock
, flags
);
1012 return AC_ERR_SYSTEM
;
1015 /* initialize internal qc */
1017 /* XXX: Tag 0 is used for drivers with legacy EH as some
1018 * drivers choke if any other tag is given. This breaks
1019 * ata_tag_internal() test for those drivers. Don't use new
1020 * EH stuff without converting to it.
1022 if (ap
->ops
->error_handler
)
1023 tag
= ATA_TAG_INTERNAL
;
1027 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1029 qc
= __ata_qc_from_tag(ap
, tag
);
1037 preempted_tag
= ap
->active_tag
;
1038 preempted_sactive
= ap
->sactive
;
1039 preempted_qc_active
= ap
->qc_active
;
1040 ap
->active_tag
= ATA_TAG_POISON
;
1044 /* prepare & issue qc */
1047 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1048 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1049 qc
->dma_dir
= dma_dir
;
1050 if (dma_dir
!= DMA_NONE
) {
1051 ata_sg_init_one(qc
, buf
, buflen
);
1052 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1055 qc
->private_data
= &wait
;
1056 qc
->complete_fn
= ata_qc_complete_internal
;
1060 spin_unlock_irqrestore(ap
->lock
, flags
);
1062 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1064 ata_port_flush_task(ap
);
1067 spin_lock_irqsave(ap
->lock
, flags
);
1069 /* We're racing with irq here. If we lose, the
1070 * following test prevents us from completing the qc
1071 * twice. If we win, the port is frozen and will be
1072 * cleaned up by ->post_internal_cmd().
1074 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1075 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1077 if (ap
->ops
->error_handler
)
1078 ata_port_freeze(ap
);
1080 ata_qc_complete(qc
);
1082 if (ata_msg_warn(ap
))
1083 ata_dev_printk(dev
, KERN_WARNING
,
1084 "qc timeout (cmd 0x%x)\n", command
);
1087 spin_unlock_irqrestore(ap
->lock
, flags
);
1090 /* do post_internal_cmd */
1091 if (ap
->ops
->post_internal_cmd
)
1092 ap
->ops
->post_internal_cmd(qc
);
1094 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1095 if (ata_msg_warn(ap
))
1096 ata_dev_printk(dev
, KERN_WARNING
,
1097 "zero err_mask for failed "
1098 "internal command, assuming AC_ERR_OTHER\n");
1099 qc
->err_mask
|= AC_ERR_OTHER
;
1103 spin_lock_irqsave(ap
->lock
, flags
);
1105 *tf
= qc
->result_tf
;
1106 err_mask
= qc
->err_mask
;
1109 ap
->active_tag
= preempted_tag
;
1110 ap
->sactive
= preempted_sactive
;
1111 ap
->qc_active
= preempted_qc_active
;
1113 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1114 * Until those drivers are fixed, we detect the condition
1115 * here, fail the command with AC_ERR_SYSTEM and reenable the
1118 * Note that this doesn't change any behavior as internal
1119 * command failure results in disabling the device in the
1120 * higher layer for LLDDs without new reset/EH callbacks.
1122 * Kill the following code as soon as those drivers are fixed.
1124 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1125 err_mask
|= AC_ERR_SYSTEM
;
1129 spin_unlock_irqrestore(ap
->lock
, flags
);
1135 * ata_pio_need_iordy - check if iordy needed
1138 * Check if the current speed of the device requires IORDY. Used
1139 * by various controllers for chip configuration.
1142 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1145 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1152 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1154 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1155 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1156 /* Is the speed faster than the drive allows non IORDY ? */
1158 /* This is cycle times not frequency - watch the logic! */
1159 if (pio
> 240) /* PIO2 is 240nS per cycle */
1168 * ata_dev_read_id - Read ID data from the specified device
1169 * @dev: target device
1170 * @p_class: pointer to class of the target device (may be changed)
1171 * @post_reset: is this read ID post-reset?
1172 * @id: buffer to read IDENTIFY data into
1174 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1175 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1176 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1177 * for pre-ATA4 drives.
1180 * Kernel thread context (may sleep)
1183 * 0 on success, -errno otherwise.
1185 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1186 int post_reset
, u16
*id
)
1188 struct ata_port
*ap
= dev
->ap
;
1189 unsigned int class = *p_class
;
1190 struct ata_taskfile tf
;
1191 unsigned int err_mask
= 0;
1195 if (ata_msg_ctl(ap
))
1196 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1197 __FUNCTION__
, ap
->id
, dev
->devno
);
1199 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1202 ata_tf_init(dev
, &tf
);
1206 tf
.command
= ATA_CMD_ID_ATA
;
1209 tf
.command
= ATA_CMD_ID_ATAPI
;
1213 reason
= "unsupported class";
1217 tf
.protocol
= ATA_PROT_PIO
;
1219 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1220 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1223 reason
= "I/O error";
1227 swap_buf_le16(id
, ATA_ID_WORDS
);
1230 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1232 reason
= "device reports illegal type";
1236 if (post_reset
&& class == ATA_DEV_ATA
) {
1238 * The exact sequence expected by certain pre-ATA4 drives is:
1241 * INITIALIZE DEVICE PARAMETERS
1243 * Some drives were very specific about that exact sequence.
1245 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1246 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1249 reason
= "INIT_DEV_PARAMS failed";
1253 /* current CHS translation info (id[53-58]) might be
1254 * changed. reread the identify device info.
1266 if (ata_msg_warn(ap
))
1267 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1268 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1272 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1274 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1277 static void ata_dev_config_ncq(struct ata_device
*dev
,
1278 char *desc
, size_t desc_sz
)
1280 struct ata_port
*ap
= dev
->ap
;
1281 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1283 if (!ata_id_has_ncq(dev
->id
)) {
1288 if (ap
->flags
& ATA_FLAG_NCQ
) {
1289 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1290 dev
->flags
|= ATA_DFLAG_NCQ
;
1293 if (hdepth
>= ddepth
)
1294 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1296 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1300 * ata_dev_configure - Configure the specified ATA/ATAPI device
1301 * @dev: Target device to configure
1302 * @print_info: Enable device info printout
1304 * Configure @dev according to @dev->id. Generic and low-level
1305 * driver specific fixups are also applied.
1308 * Kernel thread context (may sleep)
1311 * 0 on success, -errno otherwise
1313 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1315 struct ata_port
*ap
= dev
->ap
;
1316 const u16
*id
= dev
->id
;
1317 unsigned int xfer_mask
;
1320 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1321 ata_dev_printk(dev
, KERN_INFO
, "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1322 __FUNCTION__
, ap
->id
, dev
->devno
);
1326 if (ata_msg_probe(ap
))
1327 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1328 __FUNCTION__
, ap
->id
, dev
->devno
);
1330 /* print device capabilities */
1331 if (ata_msg_probe(ap
))
1332 ata_dev_printk(dev
, KERN_DEBUG
, "%s: cfg 49:%04x 82:%04x 83:%04x "
1333 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1335 id
[49], id
[82], id
[83], id
[84],
1336 id
[85], id
[86], id
[87], id
[88]);
1338 /* initialize to-be-configured parameters */
1339 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1340 dev
->max_sectors
= 0;
1348 * common ATA, ATAPI feature tests
1351 /* find max transfer mode; for printk only */
1352 xfer_mask
= ata_id_xfermask(id
);
1354 if (ata_msg_probe(ap
))
1357 /* ATA-specific feature tests */
1358 if (dev
->class == ATA_DEV_ATA
) {
1359 dev
->n_sectors
= ata_id_n_sectors(id
);
1361 if (ata_id_has_lba(id
)) {
1362 const char *lba_desc
;
1366 dev
->flags
|= ATA_DFLAG_LBA
;
1367 if (ata_id_has_lba48(id
)) {
1368 dev
->flags
|= ATA_DFLAG_LBA48
;
1373 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1375 /* print device info to dmesg */
1376 if (ata_msg_info(ap
))
1377 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1378 "max %s, %Lu sectors: %s %s\n",
1379 ata_id_major_version(id
),
1380 ata_mode_string(xfer_mask
),
1381 (unsigned long long)dev
->n_sectors
,
1382 lba_desc
, ncq_desc
);
1386 /* Default translation */
1387 dev
->cylinders
= id
[1];
1389 dev
->sectors
= id
[6];
1391 if (ata_id_current_chs_valid(id
)) {
1392 /* Current CHS translation is valid. */
1393 dev
->cylinders
= id
[54];
1394 dev
->heads
= id
[55];
1395 dev
->sectors
= id
[56];
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: CHS %u/%u/%u\n",
1402 ata_id_major_version(id
),
1403 ata_mode_string(xfer_mask
),
1404 (unsigned long long)dev
->n_sectors
,
1405 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1408 if (dev
->id
[59] & 0x100) {
1409 dev
->multi_count
= dev
->id
[59] & 0xff;
1410 if (ata_msg_info(ap
))
1411 ata_dev_printk(dev
, KERN_INFO
, "ata%u: dev %u multi count %u\n",
1412 ap
->id
, dev
->devno
, dev
->multi_count
);
1418 /* ATAPI-specific feature tests */
1419 else if (dev
->class == ATA_DEV_ATAPI
) {
1420 char *cdb_intr_string
= "";
1422 rc
= atapi_cdb_len(id
);
1423 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1424 if (ata_msg_warn(ap
))
1425 ata_dev_printk(dev
, KERN_WARNING
,
1426 "unsupported CDB len\n");
1430 dev
->cdb_len
= (unsigned int) rc
;
1432 if (ata_id_cdb_intr(dev
->id
)) {
1433 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1434 cdb_intr_string
= ", CDB intr";
1437 /* print device info to dmesg */
1438 if (ata_msg_info(ap
))
1439 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1440 ata_mode_string(xfer_mask
),
1444 ap
->host
->max_cmd_len
= 0;
1445 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1446 ap
->host
->max_cmd_len
= max_t(unsigned int,
1447 ap
->host
->max_cmd_len
,
1448 ap
->device
[i
].cdb_len
);
1450 /* limit bridge transfers to udma5, 200 sectors */
1451 if (ata_dev_knobble(dev
)) {
1452 if (ata_msg_info(ap
))
1453 ata_dev_printk(dev
, KERN_INFO
,
1454 "applying bridge limits\n");
1455 dev
->udma_mask
&= ATA_UDMA5
;
1456 dev
->max_sectors
= ATA_MAX_SECTORS
;
1459 if (ap
->ops
->dev_config
)
1460 ap
->ops
->dev_config(ap
, dev
);
1462 if (ata_msg_probe(ap
))
1463 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1464 __FUNCTION__
, ata_chk_status(ap
));
1468 if (ata_msg_probe(ap
))
1469 ata_dev_printk(dev
, KERN_DEBUG
,
1470 "%s: EXIT, err\n", __FUNCTION__
);
1475 * ata_bus_probe - Reset and probe ATA bus
1478 * Master ATA bus probing function. Initiates a hardware-dependent
1479 * bus reset, then attempts to identify any devices found on
1483 * PCI/etc. bus probe sem.
1486 * Zero on success, negative errno otherwise.
1489 static int ata_bus_probe(struct ata_port
*ap
)
1491 unsigned int classes
[ATA_MAX_DEVICES
];
1492 int tries
[ATA_MAX_DEVICES
];
1493 int i
, rc
, down_xfermask
;
1494 struct ata_device
*dev
;
1498 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1499 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1504 /* reset and determine device classes */
1505 ap
->ops
->phy_reset(ap
);
1507 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1508 dev
= &ap
->device
[i
];
1510 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1511 dev
->class != ATA_DEV_UNKNOWN
)
1512 classes
[dev
->devno
] = dev
->class;
1514 classes
[dev
->devno
] = ATA_DEV_NONE
;
1516 dev
->class = ATA_DEV_UNKNOWN
;
1521 /* after the reset the device state is PIO 0 and the controller
1522 state is undefined. Record the mode */
1524 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1525 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1527 /* read IDENTIFY page and configure devices */
1528 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1529 dev
= &ap
->device
[i
];
1532 dev
->class = classes
[i
];
1534 if (!ata_dev_enabled(dev
))
1537 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1541 rc
= ata_dev_configure(dev
, 1);
1546 /* configure transfer mode */
1547 rc
= ata_set_mode(ap
, &dev
);
1553 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1554 if (ata_dev_enabled(&ap
->device
[i
]))
1557 /* no device present, disable port */
1558 ata_port_disable(ap
);
1559 ap
->ops
->port_disable(ap
);
1566 tries
[dev
->devno
] = 0;
1569 sata_down_spd_limit(ap
);
1572 tries
[dev
->devno
]--;
1573 if (down_xfermask
&&
1574 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1575 tries
[dev
->devno
] = 0;
1578 if (!tries
[dev
->devno
]) {
1579 ata_down_xfermask_limit(dev
, 1);
1580 ata_dev_disable(dev
);
1587 * ata_port_probe - Mark port as enabled
1588 * @ap: Port for which we indicate enablement
1590 * Modify @ap data structure such that the system
1591 * thinks that the entire port is enabled.
1593 * LOCKING: host_set lock, or some other form of
1597 void ata_port_probe(struct ata_port
*ap
)
1599 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1603 * sata_print_link_status - Print SATA link status
1604 * @ap: SATA port to printk link status about
1606 * This function prints link speed and status of a SATA link.
1611 static void sata_print_link_status(struct ata_port
*ap
)
1613 u32 sstatus
, scontrol
, tmp
;
1615 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1617 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1619 if (ata_port_online(ap
)) {
1620 tmp
= (sstatus
>> 4) & 0xf;
1621 ata_port_printk(ap
, KERN_INFO
,
1622 "SATA link up %s (SStatus %X SControl %X)\n",
1623 sata_spd_string(tmp
), sstatus
, scontrol
);
1625 ata_port_printk(ap
, KERN_INFO
,
1626 "SATA link down (SStatus %X SControl %X)\n",
1632 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1633 * @ap: SATA port associated with target SATA PHY.
1635 * This function issues commands to standard SATA Sxxx
1636 * PHY registers, to wake up the phy (and device), and
1637 * clear any reset condition.
1640 * PCI/etc. bus probe sem.
1643 void __sata_phy_reset(struct ata_port
*ap
)
1646 unsigned long timeout
= jiffies
+ (HZ
* 5);
1648 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1649 /* issue phy wake/reset */
1650 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1651 /* Couldn't find anything in SATA I/II specs, but
1652 * AHCI-1.1 10.4.2 says at least 1 ms. */
1655 /* phy wake/clear reset */
1656 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1658 /* wait for phy to become ready, if necessary */
1661 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1662 if ((sstatus
& 0xf) != 1)
1664 } while (time_before(jiffies
, timeout
));
1666 /* print link status */
1667 sata_print_link_status(ap
);
1669 /* TODO: phy layer with polling, timeouts, etc. */
1670 if (!ata_port_offline(ap
))
1673 ata_port_disable(ap
);
1675 if (ap
->flags
& ATA_FLAG_DISABLED
)
1678 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1679 ata_port_disable(ap
);
1683 ap
->cbl
= ATA_CBL_SATA
;
1687 * sata_phy_reset - Reset SATA bus.
1688 * @ap: SATA port associated with target SATA PHY.
1690 * This function resets the SATA bus, and then probes
1691 * the bus for devices.
1694 * PCI/etc. bus probe sem.
1697 void sata_phy_reset(struct ata_port
*ap
)
1699 __sata_phy_reset(ap
);
1700 if (ap
->flags
& ATA_FLAG_DISABLED
)
1706 * ata_dev_pair - return other device on cable
1709 * Obtain the other device on the same cable, or if none is
1710 * present NULL is returned
1713 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1715 struct ata_port
*ap
= adev
->ap
;
1716 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1717 if (!ata_dev_enabled(pair
))
1723 * ata_port_disable - Disable port.
1724 * @ap: Port to be disabled.
1726 * Modify @ap data structure such that the system
1727 * thinks that the entire port is disabled, and should
1728 * never attempt to probe or communicate with devices
1731 * LOCKING: host_set lock, or some other form of
1735 void ata_port_disable(struct ata_port
*ap
)
1737 ap
->device
[0].class = ATA_DEV_NONE
;
1738 ap
->device
[1].class = ATA_DEV_NONE
;
1739 ap
->flags
|= ATA_FLAG_DISABLED
;
1743 * sata_down_spd_limit - adjust SATA spd limit downward
1744 * @ap: Port to adjust SATA spd limit for
1746 * Adjust SATA spd limit of @ap downward. Note that this
1747 * function only adjusts the limit. The change must be applied
1748 * using sata_set_spd().
1751 * Inherited from caller.
1754 * 0 on success, negative errno on failure
1756 int sata_down_spd_limit(struct ata_port
*ap
)
1758 u32 sstatus
, spd
, mask
;
1761 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1765 mask
= ap
->sata_spd_limit
;
1768 highbit
= fls(mask
) - 1;
1769 mask
&= ~(1 << highbit
);
1771 spd
= (sstatus
>> 4) & 0xf;
1775 mask
&= (1 << spd
) - 1;
1779 ap
->sata_spd_limit
= mask
;
1781 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1782 sata_spd_string(fls(mask
)));
1787 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1791 if (ap
->sata_spd_limit
== UINT_MAX
)
1794 limit
= fls(ap
->sata_spd_limit
);
1796 spd
= (*scontrol
>> 4) & 0xf;
1797 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1799 return spd
!= limit
;
1803 * sata_set_spd_needed - is SATA spd configuration needed
1804 * @ap: Port in question
1806 * Test whether the spd limit in SControl matches
1807 * @ap->sata_spd_limit. This function is used to determine
1808 * whether hardreset is necessary to apply SATA spd
1812 * Inherited from caller.
1815 * 1 if SATA spd configuration is needed, 0 otherwise.
1817 int sata_set_spd_needed(struct ata_port
*ap
)
1821 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1824 return __sata_set_spd_needed(ap
, &scontrol
);
1828 * sata_set_spd - set SATA spd according to spd limit
1829 * @ap: Port to set SATA spd for
1831 * Set SATA spd of @ap according to sata_spd_limit.
1834 * Inherited from caller.
1837 * 0 if spd doesn't need to be changed, 1 if spd has been
1838 * changed. Negative errno if SCR registers are inaccessible.
1840 int sata_set_spd(struct ata_port
*ap
)
1845 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1848 if (!__sata_set_spd_needed(ap
, &scontrol
))
1851 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1858 * This mode timing computation functionality is ported over from
1859 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1862 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1863 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1864 * for PIO 5, which is a nonstandard extension and UDMA6, which
1865 * is currently supported only by Maxtor drives.
1868 static const struct ata_timing ata_timing
[] = {
1870 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1871 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1872 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1873 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1875 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1876 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1877 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1879 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1881 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1882 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1883 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1885 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1886 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1887 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1889 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1890 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1891 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1893 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1894 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1895 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1897 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1902 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1903 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1905 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1907 q
->setup
= EZ(t
->setup
* 1000, T
);
1908 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1909 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1910 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1911 q
->active
= EZ(t
->active
* 1000, T
);
1912 q
->recover
= EZ(t
->recover
* 1000, T
);
1913 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1914 q
->udma
= EZ(t
->udma
* 1000, UT
);
1917 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1918 struct ata_timing
*m
, unsigned int what
)
1920 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1921 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1922 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1923 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1924 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1925 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1926 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1927 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1930 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1932 const struct ata_timing
*t
;
1934 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1935 if (t
->mode
== 0xFF)
1940 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1941 struct ata_timing
*t
, int T
, int UT
)
1943 const struct ata_timing
*s
;
1944 struct ata_timing p
;
1950 if (!(s
= ata_timing_find_mode(speed
)))
1953 memcpy(t
, s
, sizeof(*s
));
1956 * If the drive is an EIDE drive, it can tell us it needs extended
1957 * PIO/MW_DMA cycle timing.
1960 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1961 memset(&p
, 0, sizeof(p
));
1962 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1963 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1964 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1965 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1966 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1968 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1972 * Convert the timing to bus clock counts.
1975 ata_timing_quantize(t
, t
, T
, UT
);
1978 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1979 * S.M.A.R.T * and some other commands. We have to ensure that the
1980 * DMA cycle timing is slower/equal than the fastest PIO timing.
1983 if (speed
> XFER_PIO_4
) {
1984 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1985 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1989 * Lengthen active & recovery time so that cycle time is correct.
1992 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1993 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1994 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1997 if (t
->active
+ t
->recover
< t
->cycle
) {
1998 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1999 t
->recover
= t
->cycle
- t
->active
;
2006 * ata_down_xfermask_limit - adjust dev xfer masks downward
2007 * @dev: Device to adjust xfer masks
2008 * @force_pio0: Force PIO0
2010 * Adjust xfer masks of @dev downward. Note that this function
2011 * does not apply the change. Invoking ata_set_mode() afterwards
2012 * will apply the limit.
2015 * Inherited from caller.
2018 * 0 on success, negative errno on failure
2020 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2022 unsigned long xfer_mask
;
2025 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2030 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2031 if (xfer_mask
& ATA_MASK_UDMA
)
2032 xfer_mask
&= ~ATA_MASK_MWDMA
;
2034 highbit
= fls(xfer_mask
) - 1;
2035 xfer_mask
&= ~(1 << highbit
);
2037 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2041 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2044 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2045 ata_mode_string(xfer_mask
));
2053 static int ata_dev_set_mode(struct ata_device
*dev
)
2055 unsigned int err_mask
;
2058 dev
->flags
&= ~ATA_DFLAG_PIO
;
2059 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2060 dev
->flags
|= ATA_DFLAG_PIO
;
2062 err_mask
= ata_dev_set_xfermode(dev
);
2064 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2065 "(err_mask=0x%x)\n", err_mask
);
2069 rc
= ata_dev_revalidate(dev
, 0);
2073 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2074 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2076 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2077 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2082 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2083 * @ap: port on which timings will be programmed
2084 * @r_failed_dev: out paramter for failed device
2086 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2087 * ata_set_mode() fails, pointer to the failing device is
2088 * returned in @r_failed_dev.
2091 * PCI/etc. bus probe sem.
2094 * 0 on success, negative errno otherwise
2096 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2098 struct ata_device
*dev
;
2099 int i
, rc
= 0, used_dma
= 0, found
= 0;
2101 /* has private set_mode? */
2102 if (ap
->ops
->set_mode
) {
2103 /* FIXME: make ->set_mode handle no device case and
2104 * return error code and failing device on failure.
2106 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2107 if (ata_dev_enabled(&ap
->device
[i
])) {
2108 ap
->ops
->set_mode(ap
);
2115 /* step 1: calculate xfer_mask */
2116 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2117 unsigned int pio_mask
, dma_mask
;
2119 dev
= &ap
->device
[i
];
2121 if (!ata_dev_enabled(dev
))
2124 ata_dev_xfermask(dev
);
2126 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2127 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2128 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2129 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2138 /* step 2: always set host PIO timings */
2139 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2140 dev
= &ap
->device
[i
];
2141 if (!ata_dev_enabled(dev
))
2144 if (!dev
->pio_mode
) {
2145 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2150 dev
->xfer_mode
= dev
->pio_mode
;
2151 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2152 if (ap
->ops
->set_piomode
)
2153 ap
->ops
->set_piomode(ap
, dev
);
2156 /* step 3: set host DMA timings */
2157 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2158 dev
= &ap
->device
[i
];
2160 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2163 dev
->xfer_mode
= dev
->dma_mode
;
2164 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2165 if (ap
->ops
->set_dmamode
)
2166 ap
->ops
->set_dmamode(ap
, dev
);
2169 /* step 4: update devices' xfer mode */
2170 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2171 dev
= &ap
->device
[i
];
2173 if (!ata_dev_enabled(dev
))
2176 rc
= ata_dev_set_mode(dev
);
2181 /* Record simplex status. If we selected DMA then the other
2182 * host channels are not permitted to do so.
2184 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2185 ap
->host_set
->simplex_claimed
= 1;
2187 /* step5: chip specific finalisation */
2188 if (ap
->ops
->post_set_mode
)
2189 ap
->ops
->post_set_mode(ap
);
2193 *r_failed_dev
= dev
;
2198 * ata_tf_to_host - issue ATA taskfile to host controller
2199 * @ap: port to which command is being issued
2200 * @tf: ATA taskfile register set
2202 * Issues ATA taskfile register set to ATA host controller,
2203 * with proper synchronization with interrupt handler and
2207 * spin_lock_irqsave(host_set lock)
2210 static inline void ata_tf_to_host(struct ata_port
*ap
,
2211 const struct ata_taskfile
*tf
)
2213 ap
->ops
->tf_load(ap
, tf
);
2214 ap
->ops
->exec_command(ap
, tf
);
2218 * ata_busy_sleep - sleep until BSY clears, or timeout
2219 * @ap: port containing status register to be polled
2220 * @tmout_pat: impatience timeout
2221 * @tmout: overall timeout
2223 * Sleep until ATA Status register bit BSY clears,
2224 * or a timeout occurs.
2229 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2230 unsigned long tmout_pat
, unsigned long tmout
)
2232 unsigned long timer_start
, timeout
;
2235 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2236 timer_start
= jiffies
;
2237 timeout
= timer_start
+ tmout_pat
;
2238 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2240 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2243 if (status
& ATA_BUSY
)
2244 ata_port_printk(ap
, KERN_WARNING
,
2245 "port is slow to respond, please be patient\n");
2247 timeout
= timer_start
+ tmout
;
2248 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2250 status
= ata_chk_status(ap
);
2253 if (status
& ATA_BUSY
) {
2254 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2255 "(%lu secs)\n", tmout
/ HZ
);
2262 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2264 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2265 unsigned int dev0
= devmask
& (1 << 0);
2266 unsigned int dev1
= devmask
& (1 << 1);
2267 unsigned long timeout
;
2269 /* if device 0 was found in ata_devchk, wait for its
2273 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2275 /* if device 1 was found in ata_devchk, wait for
2276 * register access, then wait for BSY to clear
2278 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2282 ap
->ops
->dev_select(ap
, 1);
2283 if (ap
->flags
& ATA_FLAG_MMIO
) {
2284 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2285 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2287 nsect
= inb(ioaddr
->nsect_addr
);
2288 lbal
= inb(ioaddr
->lbal_addr
);
2290 if ((nsect
== 1) && (lbal
== 1))
2292 if (time_after(jiffies
, timeout
)) {
2296 msleep(50); /* give drive a breather */
2299 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2301 /* is all this really necessary? */
2302 ap
->ops
->dev_select(ap
, 0);
2304 ap
->ops
->dev_select(ap
, 1);
2306 ap
->ops
->dev_select(ap
, 0);
2309 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2310 unsigned int devmask
)
2312 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2314 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2316 /* software reset. causes dev0 to be selected */
2317 if (ap
->flags
& ATA_FLAG_MMIO
) {
2318 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2319 udelay(20); /* FIXME: flush */
2320 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2321 udelay(20); /* FIXME: flush */
2322 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2324 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2326 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2328 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2331 /* spec mandates ">= 2ms" before checking status.
2332 * We wait 150ms, because that was the magic delay used for
2333 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2334 * between when the ATA command register is written, and then
2335 * status is checked. Because waiting for "a while" before
2336 * checking status is fine, post SRST, we perform this magic
2337 * delay here as well.
2339 * Old drivers/ide uses the 2mS rule and then waits for ready
2343 /* Before we perform post reset processing we want to see if
2344 * the bus shows 0xFF because the odd clown forgets the D7
2345 * pulldown resistor.
2347 if (ata_check_status(ap
) == 0xFF) {
2348 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2349 return AC_ERR_OTHER
;
2352 ata_bus_post_reset(ap
, devmask
);
2358 * ata_bus_reset - reset host port and associated ATA channel
2359 * @ap: port to reset
2361 * This is typically the first time we actually start issuing
2362 * commands to the ATA channel. We wait for BSY to clear, then
2363 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2364 * result. Determine what devices, if any, are on the channel
2365 * by looking at the device 0/1 error register. Look at the signature
2366 * stored in each device's taskfile registers, to determine if
2367 * the device is ATA or ATAPI.
2370 * PCI/etc. bus probe sem.
2371 * Obtains host_set lock.
2374 * Sets ATA_FLAG_DISABLED if bus reset fails.
2377 void ata_bus_reset(struct ata_port
*ap
)
2379 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2380 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2382 unsigned int dev0
, dev1
= 0, devmask
= 0;
2384 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2386 /* determine if device 0/1 are present */
2387 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2390 dev0
= ata_devchk(ap
, 0);
2392 dev1
= ata_devchk(ap
, 1);
2396 devmask
|= (1 << 0);
2398 devmask
|= (1 << 1);
2400 /* select device 0 again */
2401 ap
->ops
->dev_select(ap
, 0);
2403 /* issue bus reset */
2404 if (ap
->flags
& ATA_FLAG_SRST
)
2405 if (ata_bus_softreset(ap
, devmask
))
2409 * determine by signature whether we have ATA or ATAPI devices
2411 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2412 if ((slave_possible
) && (err
!= 0x81))
2413 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2415 /* re-enable interrupts */
2416 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2419 /* is double-select really necessary? */
2420 if (ap
->device
[1].class != ATA_DEV_NONE
)
2421 ap
->ops
->dev_select(ap
, 1);
2422 if (ap
->device
[0].class != ATA_DEV_NONE
)
2423 ap
->ops
->dev_select(ap
, 0);
2425 /* if no devices were detected, disable this port */
2426 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2427 (ap
->device
[1].class == ATA_DEV_NONE
))
2430 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2431 /* set up device control for ATA_FLAG_SATA_RESET */
2432 if (ap
->flags
& ATA_FLAG_MMIO
)
2433 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2435 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2442 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2443 ap
->ops
->port_disable(ap
);
2449 * sata_phy_debounce - debounce SATA phy status
2450 * @ap: ATA port to debounce SATA phy status for
2451 * @params: timing parameters { interval, duratinon, timeout } in msec
2453 * Make sure SStatus of @ap reaches stable state, determined by
2454 * holding the same value where DET is not 1 for @duration polled
2455 * every @interval, before @timeout. Timeout constraints the
2456 * beginning of the stable state. Because, after hot unplugging,
2457 * DET gets stuck at 1 on some controllers, this functions waits
2458 * until timeout then returns 0 if DET is stable at 1.
2461 * Kernel thread context (may sleep)
2464 * 0 on success, -errno on failure.
2466 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2468 unsigned long interval_msec
= params
[0];
2469 unsigned long duration
= params
[1] * HZ
/ 1000;
2470 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2471 unsigned long last_jiffies
;
2475 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2480 last_jiffies
= jiffies
;
2483 msleep(interval_msec
);
2484 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2490 if (cur
== 1 && time_before(jiffies
, timeout
))
2492 if (time_after(jiffies
, last_jiffies
+ duration
))
2497 /* unstable, start over */
2499 last_jiffies
= jiffies
;
2502 if (time_after(jiffies
, timeout
))
2508 * sata_phy_resume - resume SATA phy
2509 * @ap: ATA port to resume SATA phy for
2510 * @params: timing parameters { interval, duratinon, timeout } in msec
2512 * Resume SATA phy of @ap and debounce it.
2515 * Kernel thread context (may sleep)
2518 * 0 on success, -errno on failure.
2520 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2525 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2528 scontrol
= (scontrol
& 0x0f0) | 0x300;
2530 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2533 /* Some PHYs react badly if SStatus is pounded immediately
2534 * after resuming. Delay 200ms before debouncing.
2538 return sata_phy_debounce(ap
, params
);
2541 static void ata_wait_spinup(struct ata_port
*ap
)
2543 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2544 unsigned long end
, secs
;
2547 /* first, debounce phy if SATA */
2548 if (ap
->cbl
== ATA_CBL_SATA
) {
2549 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2551 /* if debounced successfully and offline, no need to wait */
2552 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2556 /* okay, let's give the drive time to spin up */
2557 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2558 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2560 if (time_after(jiffies
, end
))
2564 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2565 "(%lu secs)\n", secs
);
2567 schedule_timeout_uninterruptible(end
- jiffies
);
2571 * ata_std_prereset - prepare for reset
2572 * @ap: ATA port to be reset
2574 * @ap is about to be reset. Initialize it.
2577 * Kernel thread context (may sleep)
2580 * 0 on success, -errno otherwise.
2582 int ata_std_prereset(struct ata_port
*ap
)
2584 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2585 const unsigned long *timing
;
2589 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2590 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2591 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2592 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2593 ata_wait_spinup(ap
);
2596 /* if we're about to do hardreset, nothing more to do */
2597 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2600 /* if SATA, resume phy */
2601 if (ap
->cbl
== ATA_CBL_SATA
) {
2602 if (ap
->flags
& ATA_FLAG_LOADING
)
2603 timing
= sata_deb_timing_boot
;
2605 timing
= sata_deb_timing_eh
;
2607 rc
= sata_phy_resume(ap
, timing
);
2608 if (rc
&& rc
!= -EOPNOTSUPP
) {
2609 /* phy resume failed */
2610 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2611 "link for reset (errno=%d)\n", rc
);
2616 /* Wait for !BSY if the controller can wait for the first D2H
2617 * Reg FIS and we don't know that no device is attached.
2619 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2620 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2626 * ata_std_softreset - reset host port via ATA SRST
2627 * @ap: port to reset
2628 * @classes: resulting classes of attached devices
2630 * Reset host port using ATA SRST.
2633 * Kernel thread context (may sleep)
2636 * 0 on success, -errno otherwise.
2638 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2640 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2641 unsigned int devmask
= 0, err_mask
;
2646 if (ata_port_offline(ap
)) {
2647 classes
[0] = ATA_DEV_NONE
;
2651 /* determine if device 0/1 are present */
2652 if (ata_devchk(ap
, 0))
2653 devmask
|= (1 << 0);
2654 if (slave_possible
&& ata_devchk(ap
, 1))
2655 devmask
|= (1 << 1);
2657 /* select device 0 again */
2658 ap
->ops
->dev_select(ap
, 0);
2660 /* issue bus reset */
2661 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2662 err_mask
= ata_bus_softreset(ap
, devmask
);
2664 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2669 /* determine by signature whether we have ATA or ATAPI devices */
2670 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2671 if (slave_possible
&& err
!= 0x81)
2672 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2675 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2680 * sata_std_hardreset - reset host port via SATA phy reset
2681 * @ap: port to reset
2682 * @class: resulting class of attached device
2684 * SATA phy-reset host port using DET bits of SControl register.
2687 * Kernel thread context (may sleep)
2690 * 0 on success, -errno otherwise.
2692 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2699 if (sata_set_spd_needed(ap
)) {
2700 /* SATA spec says nothing about how to reconfigure
2701 * spd. To be on the safe side, turn off phy during
2702 * reconfiguration. This works for at least ICH7 AHCI
2705 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2708 scontrol
= (scontrol
& 0x0f0) | 0x302;
2710 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2716 /* issue phy wake/reset */
2717 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2720 scontrol
= (scontrol
& 0x0f0) | 0x301;
2722 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2725 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2726 * 10.4.2 says at least 1 ms.
2730 /* bring phy back */
2731 sata_phy_resume(ap
, sata_deb_timing_eh
);
2733 /* TODO: phy layer with polling, timeouts, etc. */
2734 if (ata_port_offline(ap
)) {
2735 *class = ATA_DEV_NONE
;
2736 DPRINTK("EXIT, link offline\n");
2740 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2741 ata_port_printk(ap
, KERN_ERR
,
2742 "COMRESET failed (device not ready)\n");
2746 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2748 *class = ata_dev_try_classify(ap
, 0, NULL
);
2750 DPRINTK("EXIT, class=%u\n", *class);
2755 * ata_std_postreset - standard postreset callback
2756 * @ap: the target ata_port
2757 * @classes: classes of attached devices
2759 * This function is invoked after a successful reset. Note that
2760 * the device might have been reset more than once using
2761 * different reset methods before postreset is invoked.
2764 * Kernel thread context (may sleep)
2766 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2772 /* print link status */
2773 sata_print_link_status(ap
);
2776 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2777 sata_scr_write(ap
, SCR_ERROR
, serror
);
2779 /* re-enable interrupts */
2780 if (!ap
->ops
->error_handler
) {
2781 /* FIXME: hack. create a hook instead */
2782 if (ap
->ioaddr
.ctl_addr
)
2786 /* is double-select really necessary? */
2787 if (classes
[0] != ATA_DEV_NONE
)
2788 ap
->ops
->dev_select(ap
, 1);
2789 if (classes
[1] != ATA_DEV_NONE
)
2790 ap
->ops
->dev_select(ap
, 0);
2792 /* bail out if no device is present */
2793 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2794 DPRINTK("EXIT, no device\n");
2798 /* set up device control */
2799 if (ap
->ioaddr
.ctl_addr
) {
2800 if (ap
->flags
& ATA_FLAG_MMIO
)
2801 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2803 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2810 * ata_dev_same_device - Determine whether new ID matches configured device
2811 * @dev: device to compare against
2812 * @new_class: class of the new device
2813 * @new_id: IDENTIFY page of the new device
2815 * Compare @new_class and @new_id against @dev and determine
2816 * whether @dev is the device indicated by @new_class and
2823 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2825 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2828 const u16
*old_id
= dev
->id
;
2829 unsigned char model
[2][41], serial
[2][21];
2832 if (dev
->class != new_class
) {
2833 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2834 dev
->class, new_class
);
2838 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2839 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2840 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2841 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2842 new_n_sectors
= ata_id_n_sectors(new_id
);
2844 if (strcmp(model
[0], model
[1])) {
2845 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2846 "'%s' != '%s'\n", model
[0], model
[1]);
2850 if (strcmp(serial
[0], serial
[1])) {
2851 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2852 "'%s' != '%s'\n", serial
[0], serial
[1]);
2856 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2857 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2859 (unsigned long long)dev
->n_sectors
,
2860 (unsigned long long)new_n_sectors
);
2868 * ata_dev_revalidate - Revalidate ATA device
2869 * @dev: device to revalidate
2870 * @post_reset: is this revalidation after reset?
2872 * Re-read IDENTIFY page and make sure @dev is still attached to
2876 * Kernel thread context (may sleep)
2879 * 0 on success, negative errno otherwise
2881 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2883 unsigned int class = dev
->class;
2884 u16
*id
= (void *)dev
->ap
->sector_buf
;
2887 if (!ata_dev_enabled(dev
)) {
2893 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2897 /* is the device still there? */
2898 if (!ata_dev_same_device(dev
, class, id
)) {
2903 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2905 /* configure device according to the new ID */
2906 rc
= ata_dev_configure(dev
, 0);
2911 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2915 static const char * const ata_dma_blacklist
[] = {
2916 "WDC AC11000H", NULL
,
2917 "WDC AC22100H", NULL
,
2918 "WDC AC32500H", NULL
,
2919 "WDC AC33100H", NULL
,
2920 "WDC AC31600H", NULL
,
2921 "WDC AC32100H", "24.09P07",
2922 "WDC AC23200L", "21.10N21",
2923 "Compaq CRD-8241B", NULL
,
2928 "SanDisk SDP3B", NULL
,
2929 "SanDisk SDP3B-64", NULL
,
2930 "SANYO CD-ROM CRD", NULL
,
2931 "HITACHI CDR-8", NULL
,
2932 "HITACHI CDR-8335", NULL
,
2933 "HITACHI CDR-8435", NULL
,
2934 "Toshiba CD-ROM XM-6202B", NULL
,
2935 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2937 "E-IDE CD-ROM CR-840", NULL
,
2938 "CD-ROM Drive/F5A", NULL
,
2939 "WPI CDD-820", NULL
,
2940 "SAMSUNG CD-ROM SC-148C", NULL
,
2941 "SAMSUNG CD-ROM SC", NULL
,
2942 "SanDisk SDP3B-64", NULL
,
2943 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2944 "_NEC DV5800A", NULL
,
2945 "SAMSUNG CD-ROM SN-124", "N001"
2948 static int ata_strim(char *s
, size_t len
)
2950 len
= strnlen(s
, len
);
2952 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2953 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2960 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2962 unsigned char model_num
[40];
2963 unsigned char model_rev
[16];
2964 unsigned int nlen
, rlen
;
2967 /* We don't support polling DMA.
2968 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
2969 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
2971 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
2972 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
2975 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2977 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2979 nlen
= ata_strim(model_num
, sizeof(model_num
));
2980 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2982 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2983 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2984 if (ata_dma_blacklist
[i
+1] == NULL
)
2986 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2994 * ata_dev_xfermask - Compute supported xfermask of the given device
2995 * @dev: Device to compute xfermask for
2997 * Compute supported xfermask of @dev and store it in
2998 * dev->*_mask. This function is responsible for applying all
2999 * known limits including host controller limits, device
3002 * FIXME: The current implementation limits all transfer modes to
3003 * the fastest of the lowested device on the port. This is not
3004 * required on most controllers.
3009 static void ata_dev_xfermask(struct ata_device
*dev
)
3011 struct ata_port
*ap
= dev
->ap
;
3012 struct ata_host_set
*hs
= ap
->host_set
;
3013 unsigned long xfer_mask
;
3016 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3017 ap
->mwdma_mask
, ap
->udma_mask
);
3019 /* Apply cable rule here. Don't apply it early because when
3020 * we handle hot plug the cable type can itself change.
3022 if (ap
->cbl
== ATA_CBL_PATA40
)
3023 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3025 /* FIXME: Use port-wide xfermask for now */
3026 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3027 struct ata_device
*d
= &ap
->device
[i
];
3029 if (ata_dev_absent(d
))
3032 if (ata_dev_disabled(d
)) {
3033 /* to avoid violating device selection timing */
3034 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3035 UINT_MAX
, UINT_MAX
);
3039 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3040 d
->mwdma_mask
, d
->udma_mask
);
3041 xfer_mask
&= ata_id_xfermask(d
->id
);
3042 if (ata_dma_blacklisted(d
))
3043 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3046 if (ata_dma_blacklisted(dev
))
3047 ata_dev_printk(dev
, KERN_WARNING
,
3048 "device is on DMA blacklist, disabling DMA\n");
3050 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3051 if (hs
->simplex_claimed
)
3052 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3055 if (ap
->ops
->mode_filter
)
3056 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3058 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3059 &dev
->mwdma_mask
, &dev
->udma_mask
);
3063 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3064 * @dev: Device to which command will be sent
3066 * Issue SET FEATURES - XFER MODE command to device @dev
3070 * PCI/etc. bus probe sem.
3073 * 0 on success, AC_ERR_* mask otherwise.
3076 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3078 struct ata_taskfile tf
;
3079 unsigned int err_mask
;
3081 /* set up set-features taskfile */
3082 DPRINTK("set features - xfer mode\n");
3084 ata_tf_init(dev
, &tf
);
3085 tf
.command
= ATA_CMD_SET_FEATURES
;
3086 tf
.feature
= SETFEATURES_XFER
;
3087 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3088 tf
.protocol
= ATA_PROT_NODATA
;
3089 tf
.nsect
= dev
->xfer_mode
;
3091 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3093 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3098 * ata_dev_init_params - Issue INIT DEV PARAMS command
3099 * @dev: Device to which command will be sent
3100 * @heads: Number of heads (taskfile parameter)
3101 * @sectors: Number of sectors (taskfile parameter)
3104 * Kernel thread context (may sleep)
3107 * 0 on success, AC_ERR_* mask otherwise.
3109 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3110 u16 heads
, u16 sectors
)
3112 struct ata_taskfile tf
;
3113 unsigned int err_mask
;
3115 /* Number of sectors per track 1-255. Number of heads 1-16 */
3116 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3117 return AC_ERR_INVALID
;
3119 /* set up init dev params taskfile */
3120 DPRINTK("init dev params \n");
3122 ata_tf_init(dev
, &tf
);
3123 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3124 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3125 tf
.protocol
= ATA_PROT_NODATA
;
3127 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3129 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3131 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3136 * ata_sg_clean - Unmap DMA memory associated with command
3137 * @qc: Command containing DMA memory to be released
3139 * Unmap all mapped DMA memory associated with this command.
3142 * spin_lock_irqsave(host_set lock)
3145 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3147 struct ata_port
*ap
= qc
->ap
;
3148 struct scatterlist
*sg
= qc
->__sg
;
3149 int dir
= qc
->dma_dir
;
3150 void *pad_buf
= NULL
;
3152 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3153 WARN_ON(sg
== NULL
);
3155 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3156 WARN_ON(qc
->n_elem
> 1);
3158 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3160 /* if we padded the buffer out to 32-bit bound, and data
3161 * xfer direction is from-device, we must copy from the
3162 * pad buffer back into the supplied buffer
3164 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3165 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3167 if (qc
->flags
& ATA_QCFLAG_SG
) {
3169 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3170 /* restore last sg */
3171 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3173 struct scatterlist
*psg
= &qc
->pad_sgent
;
3174 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3175 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3176 kunmap_atomic(addr
, KM_IRQ0
);
3180 dma_unmap_single(ap
->dev
,
3181 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3184 sg
->length
+= qc
->pad_len
;
3186 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3187 pad_buf
, qc
->pad_len
);
3190 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3195 * ata_fill_sg - Fill PCI IDE PRD table
3196 * @qc: Metadata associated with taskfile to be transferred
3198 * Fill PCI IDE PRD (scatter-gather) table with segments
3199 * associated with the current disk command.
3202 * spin_lock_irqsave(host_set lock)
3205 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3207 struct ata_port
*ap
= qc
->ap
;
3208 struct scatterlist
*sg
;
3211 WARN_ON(qc
->__sg
== NULL
);
3212 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3215 ata_for_each_sg(sg
, qc
) {
3219 /* determine if physical DMA addr spans 64K boundary.
3220 * Note h/w doesn't support 64-bit, so we unconditionally
3221 * truncate dma_addr_t to u32.
3223 addr
= (u32
) sg_dma_address(sg
);
3224 sg_len
= sg_dma_len(sg
);
3227 offset
= addr
& 0xffff;
3229 if ((offset
+ sg_len
) > 0x10000)
3230 len
= 0x10000 - offset
;
3232 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3233 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3234 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3243 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3246 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3247 * @qc: Metadata associated with taskfile to check
3249 * Allow low-level driver to filter ATA PACKET commands, returning
3250 * a status indicating whether or not it is OK to use DMA for the
3251 * supplied PACKET command.
3254 * spin_lock_irqsave(host_set lock)
3256 * RETURNS: 0 when ATAPI DMA can be used
3259 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3261 struct ata_port
*ap
= qc
->ap
;
3262 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3264 if (ap
->ops
->check_atapi_dma
)
3265 rc
= ap
->ops
->check_atapi_dma(qc
);
3270 * ata_qc_prep - Prepare taskfile for submission
3271 * @qc: Metadata associated with taskfile to be prepared
3273 * Prepare ATA taskfile for submission.
3276 * spin_lock_irqsave(host_set lock)
3278 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3280 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3286 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3289 * ata_sg_init_one - Associate command with memory buffer
3290 * @qc: Command to be associated
3291 * @buf: Memory buffer
3292 * @buflen: Length of memory buffer, in bytes.
3294 * Initialize the data-related elements of queued_cmd @qc
3295 * to point to a single memory buffer, @buf of byte length @buflen.
3298 * spin_lock_irqsave(host_set lock)
3301 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3303 struct scatterlist
*sg
;
3305 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3307 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3308 qc
->__sg
= &qc
->sgent
;
3310 qc
->orig_n_elem
= 1;
3312 qc
->nbytes
= buflen
;
3315 sg_init_one(sg
, buf
, buflen
);
3319 * ata_sg_init - Associate command with scatter-gather table.
3320 * @qc: Command to be associated
3321 * @sg: Scatter-gather table.
3322 * @n_elem: Number of elements in s/g table.
3324 * Initialize the data-related elements of queued_cmd @qc
3325 * to point to a scatter-gather table @sg, containing @n_elem
3329 * spin_lock_irqsave(host_set lock)
3332 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3333 unsigned int n_elem
)
3335 qc
->flags
|= ATA_QCFLAG_SG
;
3337 qc
->n_elem
= n_elem
;
3338 qc
->orig_n_elem
= n_elem
;
3342 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3343 * @qc: Command with memory buffer to be mapped.
3345 * DMA-map the memory buffer associated with queued_cmd @qc.
3348 * spin_lock_irqsave(host_set lock)
3351 * Zero on success, negative on error.
3354 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3356 struct ata_port
*ap
= qc
->ap
;
3357 int dir
= qc
->dma_dir
;
3358 struct scatterlist
*sg
= qc
->__sg
;
3359 dma_addr_t dma_address
;
3362 /* we must lengthen transfers to end on a 32-bit boundary */
3363 qc
->pad_len
= sg
->length
& 3;
3365 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3366 struct scatterlist
*psg
= &qc
->pad_sgent
;
3368 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3370 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3372 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3373 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3376 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3377 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3379 sg
->length
-= qc
->pad_len
;
3380 if (sg
->length
== 0)
3383 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3384 sg
->length
, qc
->pad_len
);
3392 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3394 if (dma_mapping_error(dma_address
)) {
3396 sg
->length
+= qc
->pad_len
;
3400 sg_dma_address(sg
) = dma_address
;
3401 sg_dma_len(sg
) = sg
->length
;
3404 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3405 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3411 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3412 * @qc: Command with scatter-gather table to be mapped.
3414 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3417 * spin_lock_irqsave(host_set lock)
3420 * Zero on success, negative on error.
3424 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3426 struct ata_port
*ap
= qc
->ap
;
3427 struct scatterlist
*sg
= qc
->__sg
;
3428 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3429 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3431 VPRINTK("ENTER, ata%u\n", ap
->id
);
3432 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3434 /* we must lengthen transfers to end on a 32-bit boundary */
3435 qc
->pad_len
= lsg
->length
& 3;
3437 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3438 struct scatterlist
*psg
= &qc
->pad_sgent
;
3439 unsigned int offset
;
3441 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3443 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3446 * psg->page/offset are used to copy to-be-written
3447 * data in this function or read data in ata_sg_clean.
3449 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3450 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3451 psg
->offset
= offset_in_page(offset
);
3453 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3454 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3455 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3456 kunmap_atomic(addr
, KM_IRQ0
);
3459 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3460 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3462 lsg
->length
-= qc
->pad_len
;
3463 if (lsg
->length
== 0)
3466 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3467 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3470 pre_n_elem
= qc
->n_elem
;
3471 if (trim_sg
&& pre_n_elem
)
3480 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3482 /* restore last sg */
3483 lsg
->length
+= qc
->pad_len
;
3487 DPRINTK("%d sg elements mapped\n", n_elem
);
3490 qc
->n_elem
= n_elem
;
3496 * swap_buf_le16 - swap halves of 16-bit words in place
3497 * @buf: Buffer to swap
3498 * @buf_words: Number of 16-bit words in buffer.
3500 * Swap halves of 16-bit words if needed to convert from
3501 * little-endian byte order to native cpu byte order, or
3505 * Inherited from caller.
3507 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3512 for (i
= 0; i
< buf_words
; i
++)
3513 buf
[i
] = le16_to_cpu(buf
[i
]);
3514 #endif /* __BIG_ENDIAN */
3518 * ata_mmio_data_xfer - Transfer data by MMIO
3519 * @adev: device for this I/O
3521 * @buflen: buffer length
3522 * @write_data: read/write
3524 * Transfer data from/to the device data register by MMIO.
3527 * Inherited from caller.
3530 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3531 unsigned int buflen
, int write_data
)
3533 struct ata_port
*ap
= adev
->ap
;
3535 unsigned int words
= buflen
>> 1;
3536 u16
*buf16
= (u16
*) buf
;
3537 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3539 /* Transfer multiple of 2 bytes */
3541 for (i
= 0; i
< words
; i
++)
3542 writew(le16_to_cpu(buf16
[i
]), mmio
);
3544 for (i
= 0; i
< words
; i
++)
3545 buf16
[i
] = cpu_to_le16(readw(mmio
));
3548 /* Transfer trailing 1 byte, if any. */
3549 if (unlikely(buflen
& 0x01)) {
3550 u16 align_buf
[1] = { 0 };
3551 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3554 memcpy(align_buf
, trailing_buf
, 1);
3555 writew(le16_to_cpu(align_buf
[0]), mmio
);
3557 align_buf
[0] = cpu_to_le16(readw(mmio
));
3558 memcpy(trailing_buf
, align_buf
, 1);
3564 * ata_pio_data_xfer - Transfer data by PIO
3565 * @adev: device to target
3567 * @buflen: buffer length
3568 * @write_data: read/write
3570 * Transfer data from/to the device data register by PIO.
3573 * Inherited from caller.
3576 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3577 unsigned int buflen
, int write_data
)
3579 struct ata_port
*ap
= adev
->ap
;
3580 unsigned int words
= buflen
>> 1;
3582 /* Transfer multiple of 2 bytes */
3584 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3586 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3588 /* Transfer trailing 1 byte, if any. */
3589 if (unlikely(buflen
& 0x01)) {
3590 u16 align_buf
[1] = { 0 };
3591 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3594 memcpy(align_buf
, trailing_buf
, 1);
3595 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3597 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3598 memcpy(trailing_buf
, align_buf
, 1);
3604 * ata_pio_data_xfer_noirq - Transfer data by PIO
3605 * @adev: device to target
3607 * @buflen: buffer length
3608 * @write_data: read/write
3610 * Transfer data from/to the device data register by PIO. Do the
3611 * transfer with interrupts disabled.
3614 * Inherited from caller.
3617 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3618 unsigned int buflen
, int write_data
)
3620 unsigned long flags
;
3621 local_irq_save(flags
);
3622 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3623 local_irq_restore(flags
);
3628 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3629 * @qc: Command on going
3631 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3634 * Inherited from caller.
3637 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3639 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3640 struct scatterlist
*sg
= qc
->__sg
;
3641 struct ata_port
*ap
= qc
->ap
;
3643 unsigned int offset
;
3646 if (qc
->cursect
== (qc
->nsect
- 1))
3647 ap
->hsm_task_state
= HSM_ST_LAST
;
3649 page
= sg
[qc
->cursg
].page
;
3650 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3652 /* get the current page and offset */
3653 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3654 offset
%= PAGE_SIZE
;
3656 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3658 if (PageHighMem(page
)) {
3659 unsigned long flags
;
3661 /* FIXME: use a bounce buffer */
3662 local_irq_save(flags
);
3663 buf
= kmap_atomic(page
, KM_IRQ0
);
3665 /* do the actual data transfer */
3666 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3668 kunmap_atomic(buf
, KM_IRQ0
);
3669 local_irq_restore(flags
);
3671 buf
= page_address(page
);
3672 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3678 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3685 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3686 * @qc: Command on going
3688 * Transfer one or many ATA_SECT_SIZE of data from/to the
3689 * ATA device for the DRQ request.
3692 * Inherited from caller.
3695 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3697 if (is_multi_taskfile(&qc
->tf
)) {
3698 /* READ/WRITE MULTIPLE */
3701 WARN_ON(qc
->dev
->multi_count
== 0);
3703 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3711 * atapi_send_cdb - Write CDB bytes to hardware
3712 * @ap: Port to which ATAPI device is attached.
3713 * @qc: Taskfile currently active
3715 * When device has indicated its readiness to accept
3716 * a CDB, this function is called. Send the CDB.
3722 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3725 DPRINTK("send cdb\n");
3726 WARN_ON(qc
->dev
->cdb_len
< 12);
3728 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3729 ata_altstatus(ap
); /* flush */
3731 switch (qc
->tf
.protocol
) {
3732 case ATA_PROT_ATAPI
:
3733 ap
->hsm_task_state
= HSM_ST
;
3735 case ATA_PROT_ATAPI_NODATA
:
3736 ap
->hsm_task_state
= HSM_ST_LAST
;
3738 case ATA_PROT_ATAPI_DMA
:
3739 ap
->hsm_task_state
= HSM_ST_LAST
;
3740 /* initiate bmdma */
3741 ap
->ops
->bmdma_start(qc
);
3747 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3748 * @qc: Command on going
3749 * @bytes: number of bytes
3751 * Transfer Transfer data from/to the ATAPI device.
3754 * Inherited from caller.
3758 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3760 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3761 struct scatterlist
*sg
= qc
->__sg
;
3762 struct ata_port
*ap
= qc
->ap
;
3765 unsigned int offset
, count
;
3767 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3768 ap
->hsm_task_state
= HSM_ST_LAST
;
3771 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3773 * The end of qc->sg is reached and the device expects
3774 * more data to transfer. In order not to overrun qc->sg
3775 * and fulfill length specified in the byte count register,
3776 * - for read case, discard trailing data from the device
3777 * - for write case, padding zero data to the device
3779 u16 pad_buf
[1] = { 0 };
3780 unsigned int words
= bytes
>> 1;
3783 if (words
) /* warning if bytes > 1 */
3784 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3785 "%u bytes trailing data\n", bytes
);
3787 for (i
= 0; i
< words
; i
++)
3788 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3790 ap
->hsm_task_state
= HSM_ST_LAST
;
3794 sg
= &qc
->__sg
[qc
->cursg
];
3797 offset
= sg
->offset
+ qc
->cursg_ofs
;
3799 /* get the current page and offset */
3800 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3801 offset
%= PAGE_SIZE
;
3803 /* don't overrun current sg */
3804 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3806 /* don't cross page boundaries */
3807 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3809 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3811 if (PageHighMem(page
)) {
3812 unsigned long flags
;
3814 /* FIXME: use bounce buffer */
3815 local_irq_save(flags
);
3816 buf
= kmap_atomic(page
, KM_IRQ0
);
3818 /* do the actual data transfer */
3819 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3821 kunmap_atomic(buf
, KM_IRQ0
);
3822 local_irq_restore(flags
);
3824 buf
= page_address(page
);
3825 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3829 qc
->curbytes
+= count
;
3830 qc
->cursg_ofs
+= count
;
3832 if (qc
->cursg_ofs
== sg
->length
) {
3842 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3843 * @qc: Command on going
3845 * Transfer Transfer data from/to the ATAPI device.
3848 * Inherited from caller.
3851 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3853 struct ata_port
*ap
= qc
->ap
;
3854 struct ata_device
*dev
= qc
->dev
;
3855 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3856 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3858 /* Abuse qc->result_tf for temp storage of intermediate TF
3859 * here to save some kernel stack usage.
3860 * For normal completion, qc->result_tf is not relevant. For
3861 * error, qc->result_tf is later overwritten by ata_qc_complete().
3862 * So, the correctness of qc->result_tf is not affected.
3864 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3865 ireason
= qc
->result_tf
.nsect
;
3866 bc_lo
= qc
->result_tf
.lbam
;
3867 bc_hi
= qc
->result_tf
.lbah
;
3868 bytes
= (bc_hi
<< 8) | bc_lo
;
3870 /* shall be cleared to zero, indicating xfer of data */
3871 if (ireason
& (1 << 0))
3874 /* make sure transfer direction matches expected */
3875 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3876 if (do_write
!= i_write
)
3879 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3881 __atapi_pio_bytes(qc
, bytes
);
3886 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3887 qc
->err_mask
|= AC_ERR_HSM
;
3888 ap
->hsm_task_state
= HSM_ST_ERR
;
3892 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3893 * @ap: the target ata_port
3897 * 1 if ok in workqueue, 0 otherwise.
3900 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3902 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3905 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3906 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3907 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3910 if (is_atapi_taskfile(&qc
->tf
) &&
3911 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3919 * ata_hsm_qc_complete - finish a qc running on standard HSM
3920 * @qc: Command to complete
3921 * @in_wq: 1 if called from workqueue, 0 otherwise
3923 * Finish @qc which is running on standard HSM.
3926 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3927 * Otherwise, none on entry and grabs host lock.
3929 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3931 struct ata_port
*ap
= qc
->ap
;
3932 unsigned long flags
;
3934 if (ap
->ops
->error_handler
) {
3936 spin_lock_irqsave(ap
->lock
, flags
);
3938 /* EH might have kicked in while host_set lock
3941 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3943 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3945 ata_qc_complete(qc
);
3947 ata_port_freeze(ap
);
3950 spin_unlock_irqrestore(ap
->lock
, flags
);
3952 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3953 ata_qc_complete(qc
);
3955 ata_port_freeze(ap
);
3959 spin_lock_irqsave(ap
->lock
, flags
);
3961 ata_qc_complete(qc
);
3962 spin_unlock_irqrestore(ap
->lock
, flags
);
3964 ata_qc_complete(qc
);
3967 ata_altstatus(ap
); /* flush */
3971 * ata_hsm_move - move the HSM to the next state.
3972 * @ap: the target ata_port
3974 * @status: current device status
3975 * @in_wq: 1 if called from workqueue, 0 otherwise
3978 * 1 when poll next status needed, 0 otherwise.
3980 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3981 u8 status
, int in_wq
)
3983 unsigned long flags
= 0;
3986 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3988 /* Make sure ata_qc_issue_prot() does not throw things
3989 * like DMA polling into the workqueue. Notice that
3990 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3992 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3995 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3996 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
3998 switch (ap
->hsm_task_state
) {
4000 /* Send first data block or PACKET CDB */
4002 /* If polling, we will stay in the work queue after
4003 * sending the data. Otherwise, interrupt handler
4004 * takes over after sending the data.
4006 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4008 /* check device status */
4009 if (unlikely((status
& ATA_DRQ
) == 0)) {
4010 /* handle BSY=0, DRQ=0 as error */
4011 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4012 /* device stops HSM for abort/error */
4013 qc
->err_mask
|= AC_ERR_DEV
;
4015 /* HSM violation. Let EH handle this */
4016 qc
->err_mask
|= AC_ERR_HSM
;
4018 ap
->hsm_task_state
= HSM_ST_ERR
;
4022 /* Device should not ask for data transfer (DRQ=1)
4023 * when it finds something wrong.
4024 * We ignore DRQ here and stop the HSM by
4025 * changing hsm_task_state to HSM_ST_ERR and
4026 * let the EH abort the command or reset the device.
4028 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4029 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4031 qc
->err_mask
|= AC_ERR_HSM
;
4032 ap
->hsm_task_state
= HSM_ST_ERR
;
4036 /* Send the CDB (atapi) or the first data block (ata pio out).
4037 * During the state transition, interrupt handler shouldn't
4038 * be invoked before the data transfer is complete and
4039 * hsm_task_state is changed. Hence, the following locking.
4042 spin_lock_irqsave(ap
->lock
, flags
);
4044 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4045 /* PIO data out protocol.
4046 * send first data block.
4049 /* ata_pio_sectors() might change the state
4050 * to HSM_ST_LAST. so, the state is changed here
4051 * before ata_pio_sectors().
4053 ap
->hsm_task_state
= HSM_ST
;
4054 ata_pio_sectors(qc
);
4055 ata_altstatus(ap
); /* flush */
4058 atapi_send_cdb(ap
, qc
);
4061 spin_unlock_irqrestore(ap
->lock
, flags
);
4063 /* if polling, ata_pio_task() handles the rest.
4064 * otherwise, interrupt handler takes over from here.
4069 /* complete command or read/write the data register */
4070 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4071 /* ATAPI PIO protocol */
4072 if ((status
& ATA_DRQ
) == 0) {
4073 /* No more data to transfer or device error.
4074 * Device error will be tagged in HSM_ST_LAST.
4076 ap
->hsm_task_state
= HSM_ST_LAST
;
4080 /* Device should not ask for data transfer (DRQ=1)
4081 * when it finds something wrong.
4082 * We ignore DRQ here and stop the HSM by
4083 * changing hsm_task_state to HSM_ST_ERR and
4084 * let the EH abort the command or reset the device.
4086 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4087 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4089 qc
->err_mask
|= AC_ERR_HSM
;
4090 ap
->hsm_task_state
= HSM_ST_ERR
;
4094 atapi_pio_bytes(qc
);
4096 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4097 /* bad ireason reported by device */
4101 /* ATA PIO protocol */
4102 if (unlikely((status
& ATA_DRQ
) == 0)) {
4103 /* handle BSY=0, DRQ=0 as error */
4104 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4105 /* device stops HSM for abort/error */
4106 qc
->err_mask
|= AC_ERR_DEV
;
4108 /* HSM violation. Let EH handle this */
4109 qc
->err_mask
|= AC_ERR_HSM
;
4111 ap
->hsm_task_state
= HSM_ST_ERR
;
4115 /* For PIO reads, some devices may ask for
4116 * data transfer (DRQ=1) alone with ERR=1.
4117 * We respect DRQ here and transfer one
4118 * block of junk data before changing the
4119 * hsm_task_state to HSM_ST_ERR.
4121 * For PIO writes, ERR=1 DRQ=1 doesn't make
4122 * sense since the data block has been
4123 * transferred to the device.
4125 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4126 /* data might be corrputed */
4127 qc
->err_mask
|= AC_ERR_DEV
;
4129 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4130 ata_pio_sectors(qc
);
4132 status
= ata_wait_idle(ap
);
4135 if (status
& (ATA_BUSY
| ATA_DRQ
))
4136 qc
->err_mask
|= AC_ERR_HSM
;
4138 /* ata_pio_sectors() might change the
4139 * state to HSM_ST_LAST. so, the state
4140 * is changed after ata_pio_sectors().
4142 ap
->hsm_task_state
= HSM_ST_ERR
;
4146 ata_pio_sectors(qc
);
4148 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4149 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4152 status
= ata_wait_idle(ap
);
4157 ata_altstatus(ap
); /* flush */
4162 if (unlikely(!ata_ok(status
))) {
4163 qc
->err_mask
|= __ac_err_mask(status
);
4164 ap
->hsm_task_state
= HSM_ST_ERR
;
4168 /* no more data to transfer */
4169 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4170 ap
->id
, qc
->dev
->devno
, status
);
4172 WARN_ON(qc
->err_mask
);
4174 ap
->hsm_task_state
= HSM_ST_IDLE
;
4176 /* complete taskfile transaction */
4177 ata_hsm_qc_complete(qc
, in_wq
);
4183 /* make sure qc->err_mask is available to
4184 * know what's wrong and recover
4186 WARN_ON(qc
->err_mask
== 0);
4188 ap
->hsm_task_state
= HSM_ST_IDLE
;
4190 /* complete taskfile transaction */
4191 ata_hsm_qc_complete(qc
, in_wq
);
4203 static void ata_pio_task(void *_data
)
4205 struct ata_queued_cmd
*qc
= _data
;
4206 struct ata_port
*ap
= qc
->ap
;
4211 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4214 * This is purely heuristic. This is a fast path.
4215 * Sometimes when we enter, BSY will be cleared in
4216 * a chk-status or two. If not, the drive is probably seeking
4217 * or something. Snooze for a couple msecs, then
4218 * chk-status again. If still busy, queue delayed work.
4220 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4221 if (status
& ATA_BUSY
) {
4223 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4224 if (status
& ATA_BUSY
) {
4225 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4231 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4233 /* another command or interrupt handler
4234 * may be running at this point.
4241 * ata_qc_new - Request an available ATA command, for queueing
4242 * @ap: Port associated with device @dev
4243 * @dev: Device from whom we request an available command structure
4249 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4251 struct ata_queued_cmd
*qc
= NULL
;
4254 /* no command while frozen */
4255 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4258 /* the last tag is reserved for internal command. */
4259 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4260 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4261 qc
= __ata_qc_from_tag(ap
, i
);
4272 * ata_qc_new_init - Request an available ATA command, and initialize it
4273 * @dev: Device from whom we request an available command structure
4279 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4281 struct ata_port
*ap
= dev
->ap
;
4282 struct ata_queued_cmd
*qc
;
4284 qc
= ata_qc_new(ap
);
4297 * ata_qc_free - free unused ata_queued_cmd
4298 * @qc: Command to complete
4300 * Designed to free unused ata_queued_cmd object
4301 * in case something prevents using it.
4304 * spin_lock_irqsave(host_set lock)
4306 void ata_qc_free(struct ata_queued_cmd
*qc
)
4308 struct ata_port
*ap
= qc
->ap
;
4311 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4315 if (likely(ata_tag_valid(tag
))) {
4316 qc
->tag
= ATA_TAG_POISON
;
4317 clear_bit(tag
, &ap
->qc_allocated
);
4321 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4323 struct ata_port
*ap
= qc
->ap
;
4325 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4326 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4328 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4331 /* command should be marked inactive atomically with qc completion */
4332 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4333 ap
->sactive
&= ~(1 << qc
->tag
);
4335 ap
->active_tag
= ATA_TAG_POISON
;
4337 /* atapi: mark qc as inactive to prevent the interrupt handler
4338 * from completing the command twice later, before the error handler
4339 * is called. (when rc != 0 and atapi request sense is needed)
4341 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4342 ap
->qc_active
&= ~(1 << qc
->tag
);
4344 /* call completion callback */
4345 qc
->complete_fn(qc
);
4349 * ata_qc_complete - Complete an active ATA command
4350 * @qc: Command to complete
4351 * @err_mask: ATA Status register contents
4353 * Indicate to the mid and upper layers that an ATA
4354 * command has completed, with either an ok or not-ok status.
4357 * spin_lock_irqsave(host_set lock)
4359 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4361 struct ata_port
*ap
= qc
->ap
;
4363 /* XXX: New EH and old EH use different mechanisms to
4364 * synchronize EH with regular execution path.
4366 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4367 * Normal execution path is responsible for not accessing a
4368 * failed qc. libata core enforces the rule by returning NULL
4369 * from ata_qc_from_tag() for failed qcs.
4371 * Old EH depends on ata_qc_complete() nullifying completion
4372 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4373 * not synchronize with interrupt handler. Only PIO task is
4376 if (ap
->ops
->error_handler
) {
4377 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4379 if (unlikely(qc
->err_mask
))
4380 qc
->flags
|= ATA_QCFLAG_FAILED
;
4382 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4383 if (!ata_tag_internal(qc
->tag
)) {
4384 /* always fill result TF for failed qc */
4385 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4386 ata_qc_schedule_eh(qc
);
4391 /* read result TF if requested */
4392 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4393 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4395 __ata_qc_complete(qc
);
4397 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4400 /* read result TF if failed or requested */
4401 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4402 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4404 __ata_qc_complete(qc
);
4409 * ata_qc_complete_multiple - Complete multiple qcs successfully
4410 * @ap: port in question
4411 * @qc_active: new qc_active mask
4412 * @finish_qc: LLDD callback invoked before completing a qc
4414 * Complete in-flight commands. This functions is meant to be
4415 * called from low-level driver's interrupt routine to complete
4416 * requests normally. ap->qc_active and @qc_active is compared
4417 * and commands are completed accordingly.
4420 * spin_lock_irqsave(host_set lock)
4423 * Number of completed commands on success, -errno otherwise.
4425 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4426 void (*finish_qc
)(struct ata_queued_cmd
*))
4432 done_mask
= ap
->qc_active
^ qc_active
;
4434 if (unlikely(done_mask
& qc_active
)) {
4435 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4436 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4440 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4441 struct ata_queued_cmd
*qc
;
4443 if (!(done_mask
& (1 << i
)))
4446 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4449 ata_qc_complete(qc
);
4457 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4459 struct ata_port
*ap
= qc
->ap
;
4461 switch (qc
->tf
.protocol
) {
4464 case ATA_PROT_ATAPI_DMA
:
4467 case ATA_PROT_ATAPI
:
4469 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4482 * ata_qc_issue - issue taskfile to device
4483 * @qc: command to issue to device
4485 * Prepare an ATA command to submission to device.
4486 * This includes mapping the data into a DMA-able
4487 * area, filling in the S/G table, and finally
4488 * writing the taskfile to hardware, starting the command.
4491 * spin_lock_irqsave(host_set lock)
4493 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4495 struct ata_port
*ap
= qc
->ap
;
4497 /* Make sure only one non-NCQ command is outstanding. The
4498 * check is skipped for old EH because it reuses active qc to
4499 * request ATAPI sense.
4501 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4503 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4504 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4505 ap
->sactive
|= 1 << qc
->tag
;
4507 WARN_ON(ap
->sactive
);
4508 ap
->active_tag
= qc
->tag
;
4511 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4512 ap
->qc_active
|= 1 << qc
->tag
;
4514 if (ata_should_dma_map(qc
)) {
4515 if (qc
->flags
& ATA_QCFLAG_SG
) {
4516 if (ata_sg_setup(qc
))
4518 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4519 if (ata_sg_setup_one(qc
))
4523 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4526 ap
->ops
->qc_prep(qc
);
4528 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4529 if (unlikely(qc
->err_mask
))
4534 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4535 qc
->err_mask
|= AC_ERR_SYSTEM
;
4537 ata_qc_complete(qc
);
4541 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4542 * @qc: command to issue to device
4544 * Using various libata functions and hooks, this function
4545 * starts an ATA command. ATA commands are grouped into
4546 * classes called "protocols", and issuing each type of protocol
4547 * is slightly different.
4549 * May be used as the qc_issue() entry in ata_port_operations.
4552 * spin_lock_irqsave(host_set lock)
4555 * Zero on success, AC_ERR_* mask on failure
4558 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4560 struct ata_port
*ap
= qc
->ap
;
4562 /* Use polling pio if the LLD doesn't handle
4563 * interrupt driven pio and atapi CDB interrupt.
4565 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4566 switch (qc
->tf
.protocol
) {
4568 case ATA_PROT_ATAPI
:
4569 case ATA_PROT_ATAPI_NODATA
:
4570 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4572 case ATA_PROT_ATAPI_DMA
:
4573 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4574 /* see ata_dma_blacklisted() */
4582 /* select the device */
4583 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4585 /* start the command */
4586 switch (qc
->tf
.protocol
) {
4587 case ATA_PROT_NODATA
:
4588 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4589 ata_qc_set_polling(qc
);
4591 ata_tf_to_host(ap
, &qc
->tf
);
4592 ap
->hsm_task_state
= HSM_ST_LAST
;
4594 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4595 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4600 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4602 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4603 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4604 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4605 ap
->hsm_task_state
= HSM_ST_LAST
;
4609 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4610 ata_qc_set_polling(qc
);
4612 ata_tf_to_host(ap
, &qc
->tf
);
4614 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4615 /* PIO data out protocol */
4616 ap
->hsm_task_state
= HSM_ST_FIRST
;
4617 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4619 /* always send first data block using
4620 * the ata_pio_task() codepath.
4623 /* PIO data in protocol */
4624 ap
->hsm_task_state
= HSM_ST
;
4626 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4627 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4629 /* if polling, ata_pio_task() handles the rest.
4630 * otherwise, interrupt handler takes over from here.
4636 case ATA_PROT_ATAPI
:
4637 case ATA_PROT_ATAPI_NODATA
:
4638 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4639 ata_qc_set_polling(qc
);
4641 ata_tf_to_host(ap
, &qc
->tf
);
4643 ap
->hsm_task_state
= HSM_ST_FIRST
;
4645 /* send cdb by polling if no cdb interrupt */
4646 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4647 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4648 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4651 case ATA_PROT_ATAPI_DMA
:
4652 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4654 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4655 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4656 ap
->hsm_task_state
= HSM_ST_FIRST
;
4658 /* send cdb by polling if no cdb interrupt */
4659 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4660 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4665 return AC_ERR_SYSTEM
;
4672 * ata_host_intr - Handle host interrupt for given (port, task)
4673 * @ap: Port on which interrupt arrived (possibly...)
4674 * @qc: Taskfile currently active in engine
4676 * Handle host interrupt for given queued command. Currently,
4677 * only DMA interrupts are handled. All other commands are
4678 * handled via polling with interrupts disabled (nIEN bit).
4681 * spin_lock_irqsave(host_set lock)
4684 * One if interrupt was handled, zero if not (shared irq).
4687 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4688 struct ata_queued_cmd
*qc
)
4690 u8 status
, host_stat
= 0;
4692 VPRINTK("ata%u: protocol %d task_state %d\n",
4693 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4695 /* Check whether we are expecting interrupt in this state */
4696 switch (ap
->hsm_task_state
) {
4698 /* Some pre-ATAPI-4 devices assert INTRQ
4699 * at this state when ready to receive CDB.
4702 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4703 * The flag was turned on only for atapi devices.
4704 * No need to check is_atapi_taskfile(&qc->tf) again.
4706 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4710 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4711 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4712 /* check status of DMA engine */
4713 host_stat
= ap
->ops
->bmdma_status(ap
);
4714 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4716 /* if it's not our irq... */
4717 if (!(host_stat
& ATA_DMA_INTR
))
4720 /* before we do anything else, clear DMA-Start bit */
4721 ap
->ops
->bmdma_stop(qc
);
4723 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4724 /* error when transfering data to/from memory */
4725 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4726 ap
->hsm_task_state
= HSM_ST_ERR
;
4736 /* check altstatus */
4737 status
= ata_altstatus(ap
);
4738 if (status
& ATA_BUSY
)
4741 /* check main status, clearing INTRQ */
4742 status
= ata_chk_status(ap
);
4743 if (unlikely(status
& ATA_BUSY
))
4746 /* ack bmdma irq events */
4747 ap
->ops
->irq_clear(ap
);
4749 ata_hsm_move(ap
, qc
, status
, 0);
4750 return 1; /* irq handled */
4753 ap
->stats
.idle_irq
++;
4756 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4757 ata_irq_ack(ap
, 0); /* debug trap */
4758 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4762 return 0; /* irq not handled */
4766 * ata_interrupt - Default ATA host interrupt handler
4767 * @irq: irq line (unused)
4768 * @dev_instance: pointer to our ata_host_set information structure
4771 * Default interrupt handler for PCI IDE devices. Calls
4772 * ata_host_intr() for each port that is not disabled.
4775 * Obtains host_set lock during operation.
4778 * IRQ_NONE or IRQ_HANDLED.
4781 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4783 struct ata_host_set
*host_set
= dev_instance
;
4785 unsigned int handled
= 0;
4786 unsigned long flags
;
4788 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4789 spin_lock_irqsave(&host_set
->lock
, flags
);
4791 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4792 struct ata_port
*ap
;
4794 ap
= host_set
->ports
[i
];
4796 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4797 struct ata_queued_cmd
*qc
;
4799 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4800 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4801 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4802 handled
|= ata_host_intr(ap
, qc
);
4806 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4808 return IRQ_RETVAL(handled
);
4812 * sata_scr_valid - test whether SCRs are accessible
4813 * @ap: ATA port to test SCR accessibility for
4815 * Test whether SCRs are accessible for @ap.
4821 * 1 if SCRs are accessible, 0 otherwise.
4823 int sata_scr_valid(struct ata_port
*ap
)
4825 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4829 * sata_scr_read - read SCR register of the specified port
4830 * @ap: ATA port to read SCR for
4832 * @val: Place to store read value
4834 * Read SCR register @reg of @ap into *@val. This function is
4835 * guaranteed to succeed if the cable type of the port is SATA
4836 * and the port implements ->scr_read.
4842 * 0 on success, negative errno on failure.
4844 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4846 if (sata_scr_valid(ap
)) {
4847 *val
= ap
->ops
->scr_read(ap
, reg
);
4854 * sata_scr_write - write SCR register of the specified port
4855 * @ap: ATA port to write SCR for
4856 * @reg: SCR to write
4857 * @val: value to write
4859 * Write @val to SCR register @reg of @ap. This function is
4860 * guaranteed to succeed if the cable type of the port is SATA
4861 * and the port implements ->scr_read.
4867 * 0 on success, negative errno on failure.
4869 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4871 if (sata_scr_valid(ap
)) {
4872 ap
->ops
->scr_write(ap
, reg
, val
);
4879 * sata_scr_write_flush - write SCR register of the specified port and flush
4880 * @ap: ATA port to write SCR for
4881 * @reg: SCR to write
4882 * @val: value to write
4884 * This function is identical to sata_scr_write() except that this
4885 * function performs flush after writing to the register.
4891 * 0 on success, negative errno on failure.
4893 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4895 if (sata_scr_valid(ap
)) {
4896 ap
->ops
->scr_write(ap
, reg
, val
);
4897 ap
->ops
->scr_read(ap
, reg
);
4904 * ata_port_online - test whether the given port is online
4905 * @ap: ATA port to test
4907 * Test whether @ap is online. Note that this function returns 0
4908 * if online status of @ap cannot be obtained, so
4909 * ata_port_online(ap) != !ata_port_offline(ap).
4915 * 1 if the port online status is available and online.
4917 int ata_port_online(struct ata_port
*ap
)
4921 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4927 * ata_port_offline - test whether the given port is offline
4928 * @ap: ATA port to test
4930 * Test whether @ap is offline. Note that this function returns
4931 * 0 if offline status of @ap cannot be obtained, so
4932 * ata_port_online(ap) != !ata_port_offline(ap).
4938 * 1 if the port offline status is available and offline.
4940 int ata_port_offline(struct ata_port
*ap
)
4944 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4950 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4951 * without filling any other registers
4953 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4955 struct ata_taskfile tf
;
4958 ata_tf_init(dev
, &tf
);
4961 tf
.flags
|= ATA_TFLAG_DEVICE
;
4962 tf
.protocol
= ATA_PROT_NODATA
;
4964 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4966 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
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
);