2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
,
68 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
69 struct ata_device
*dev
);
70 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
72 static unsigned int ata_unique_id
= 1;
73 static struct workqueue_struct
*ata_wq
;
75 int atapi_enabled
= 1;
76 module_param(atapi_enabled
, int, 0444);
77 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
80 module_param(atapi_dmadir
, int, 0444);
81 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
84 module_param_named(fua
, libata_fua
, int, 0444);
85 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
87 MODULE_AUTHOR("Jeff Garzik");
88 MODULE_DESCRIPTION("Library module for ATA devices");
89 MODULE_LICENSE("GPL");
90 MODULE_VERSION(DRV_VERSION
);
94 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
95 * @tf: Taskfile to convert
96 * @fis: Buffer into which data will output
97 * @pmp: Port multiplier port
99 * Converts a standard ATA taskfile to a Serial ATA
100 * FIS structure (Register - Host to Device).
103 * Inherited from caller.
106 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
108 fis
[0] = 0x27; /* Register - Host to Device FIS */
109 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
110 bit 7 indicates Command FIS */
111 fis
[2] = tf
->command
;
112 fis
[3] = tf
->feature
;
119 fis
[8] = tf
->hob_lbal
;
120 fis
[9] = tf
->hob_lbam
;
121 fis
[10] = tf
->hob_lbah
;
122 fis
[11] = tf
->hob_feature
;
125 fis
[13] = tf
->hob_nsect
;
136 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
137 * @fis: Buffer from which data will be input
138 * @tf: Taskfile to output
140 * Converts a serial ATA FIS structure to a standard ATA taskfile.
143 * Inherited from caller.
146 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
148 tf
->command
= fis
[2]; /* status */
149 tf
->feature
= fis
[3]; /* error */
156 tf
->hob_lbal
= fis
[8];
157 tf
->hob_lbam
= fis
[9];
158 tf
->hob_lbah
= fis
[10];
161 tf
->hob_nsect
= fis
[13];
164 static const u8 ata_rw_cmds
[] = {
168 ATA_CMD_READ_MULTI_EXT
,
169 ATA_CMD_WRITE_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_FUA_EXT
,
177 ATA_CMD_PIO_READ_EXT
,
178 ATA_CMD_PIO_WRITE_EXT
,
191 ATA_CMD_WRITE_FUA_EXT
195 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
196 * @qc: command to examine and configure
198 * Examine the device configuration and tf->flags to calculate
199 * the proper read/write commands and protocol to use.
204 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
206 struct ata_taskfile
*tf
= &qc
->tf
;
207 struct ata_device
*dev
= qc
->dev
;
210 int index
, fua
, lba48
, write
;
212 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
213 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
214 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
216 if (dev
->flags
& ATA_DFLAG_PIO
) {
217 tf
->protocol
= ATA_PROT_PIO
;
218 index
= dev
->multi_count
? 0 : 8;
219 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
220 /* Unable to use DMA due to host limitation */
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
224 tf
->protocol
= ATA_PROT_DMA
;
228 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
237 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
238 * @pio_mask: pio_mask
239 * @mwdma_mask: mwdma_mask
240 * @udma_mask: udma_mask
242 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
243 * unsigned int xfer_mask.
251 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
252 unsigned int mwdma_mask
,
253 unsigned int udma_mask
)
255 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
256 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
257 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
261 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
262 * @xfer_mask: xfer_mask to unpack
263 * @pio_mask: resulting pio_mask
264 * @mwdma_mask: resulting mwdma_mask
265 * @udma_mask: resulting udma_mask
267 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
268 * Any NULL distination masks will be ignored.
270 static void ata_unpack_xfermask(unsigned int xfer_mask
,
271 unsigned int *pio_mask
,
272 unsigned int *mwdma_mask
,
273 unsigned int *udma_mask
)
276 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
278 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
280 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
283 static const struct ata_xfer_ent
{
287 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
288 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
289 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
294 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
295 * @xfer_mask: xfer_mask of interest
297 * Return matching XFER_* value for @xfer_mask. Only the highest
298 * bit of @xfer_mask is considered.
304 * Matching XFER_* value, 0 if no match found.
306 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
308 int highbit
= fls(xfer_mask
) - 1;
309 const struct ata_xfer_ent
*ent
;
311 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
312 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
313 return ent
->base
+ highbit
- ent
->shift
;
318 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
319 * @xfer_mode: XFER_* of interest
321 * Return matching xfer_mask for @xfer_mode.
327 * Matching xfer_mask, 0 if no match found.
329 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
331 const struct ata_xfer_ent
*ent
;
333 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
334 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
335 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
340 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
341 * @xfer_mode: XFER_* of interest
343 * Return matching xfer_shift for @xfer_mode.
349 * Matching xfer_shift, -1 if no match found.
351 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
353 const struct ata_xfer_ent
*ent
;
355 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
356 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
362 * ata_mode_string - convert xfer_mask to string
363 * @xfer_mask: mask of bits supported; only highest bit counts.
365 * Determine string which represents the highest speed
366 * (highest bit in @modemask).
372 * Constant C string representing highest speed listed in
373 * @mode_mask, or the constant C string "<n/a>".
375 static const char *ata_mode_string(unsigned int xfer_mask
)
377 static const char * const xfer_mode_str
[] = {
397 highbit
= fls(xfer_mask
) - 1;
398 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
399 return xfer_mode_str
[highbit
];
403 static const char *sata_spd_string(unsigned int spd
)
405 static const char * const spd_str
[] = {
410 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
412 return spd_str
[spd
- 1];
415 void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
417 if (ata_dev_enabled(dev
)) {
418 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
425 * ata_pio_devchk - PATA device presence detection
426 * @ap: ATA channel to examine
427 * @device: Device to examine (starting at zero)
429 * This technique was originally described in
430 * Hale Landis's ATADRVR (www.ata-atapi.com), and
431 * later found its way into the ATA/ATAPI spec.
433 * Write a pattern to the ATA shadow registers,
434 * and if a device is present, it will respond by
435 * correctly storing and echoing back the
436 * ATA shadow register contents.
442 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
445 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
448 ap
->ops
->dev_select(ap
, device
);
450 outb(0x55, ioaddr
->nsect_addr
);
451 outb(0xaa, ioaddr
->lbal_addr
);
453 outb(0xaa, ioaddr
->nsect_addr
);
454 outb(0x55, ioaddr
->lbal_addr
);
456 outb(0x55, ioaddr
->nsect_addr
);
457 outb(0xaa, ioaddr
->lbal_addr
);
459 nsect
= inb(ioaddr
->nsect_addr
);
460 lbal
= inb(ioaddr
->lbal_addr
);
462 if ((nsect
== 0x55) && (lbal
== 0xaa))
463 return 1; /* we found a device */
465 return 0; /* nothing found */
469 * ata_mmio_devchk - PATA device presence detection
470 * @ap: ATA channel to examine
471 * @device: Device to examine (starting at zero)
473 * This technique was originally described in
474 * Hale Landis's ATADRVR (www.ata-atapi.com), and
475 * later found its way into the ATA/ATAPI spec.
477 * Write a pattern to the ATA shadow registers,
478 * and if a device is present, it will respond by
479 * correctly storing and echoing back the
480 * ATA shadow register contents.
486 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
489 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
492 ap
->ops
->dev_select(ap
, device
);
494 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
495 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
503 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
504 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
506 if ((nsect
== 0x55) && (lbal
== 0xaa))
507 return 1; /* we found a device */
509 return 0; /* nothing found */
513 * ata_devchk - PATA device presence detection
514 * @ap: ATA channel to examine
515 * @device: Device to examine (starting at zero)
517 * Dispatch ATA device presence detection, depending
518 * on whether we are using PIO or MMIO to talk to the
519 * ATA shadow registers.
525 static unsigned int ata_devchk(struct ata_port
*ap
,
528 if (ap
->flags
& ATA_FLAG_MMIO
)
529 return ata_mmio_devchk(ap
, device
);
530 return ata_pio_devchk(ap
, device
);
534 * ata_dev_classify - determine device type based on ATA-spec signature
535 * @tf: ATA taskfile register set for device to be identified
537 * Determine from taskfile register contents whether a device is
538 * ATA or ATAPI, as per "Signature and persistence" section
539 * of ATA/PI spec (volume 1, sect 5.14).
545 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
546 * the event of failure.
549 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
551 /* Apple's open source Darwin code hints that some devices only
552 * put a proper signature into the LBA mid/high registers,
553 * So, we only check those. It's sufficient for uniqueness.
556 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
557 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
558 DPRINTK("found ATA device by sig\n");
562 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
563 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
564 DPRINTK("found ATAPI device by sig\n");
565 return ATA_DEV_ATAPI
;
568 DPRINTK("unknown device\n");
569 return ATA_DEV_UNKNOWN
;
573 * ata_dev_try_classify - Parse returned ATA device signature
574 * @ap: ATA channel to examine
575 * @device: Device to examine (starting at zero)
576 * @r_err: Value of error register on completion
578 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
579 * an ATA/ATAPI-defined set of values is placed in the ATA
580 * shadow registers, indicating the results of device detection
583 * Select the ATA device, and read the values from the ATA shadow
584 * registers. Then parse according to the Error register value,
585 * and the spec-defined values examined by ata_dev_classify().
591 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
595 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
597 struct ata_taskfile tf
;
601 ap
->ops
->dev_select(ap
, device
);
603 memset(&tf
, 0, sizeof(tf
));
605 ap
->ops
->tf_read(ap
, &tf
);
610 /* see if device passed diags */
613 else if ((device
== 0) && (err
== 0x81))
618 /* determine if device is ATA or ATAPI */
619 class = ata_dev_classify(&tf
);
621 if (class == ATA_DEV_UNKNOWN
)
623 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
629 * ata_id_string - Convert IDENTIFY DEVICE page into string
630 * @id: IDENTIFY DEVICE results we will examine
631 * @s: string into which data is output
632 * @ofs: offset into identify device page
633 * @len: length of string to return. must be an even number.
635 * The strings in the IDENTIFY DEVICE page are broken up into
636 * 16-bit chunks. Run through the string, and output each
637 * 8-bit chunk linearly, regardless of platform.
643 void ata_id_string(const u16
*id
, unsigned char *s
,
644 unsigned int ofs
, unsigned int len
)
663 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
664 * @id: IDENTIFY DEVICE results we will examine
665 * @s: string into which data is output
666 * @ofs: offset into identify device page
667 * @len: length of string to return. must be an odd number.
669 * This function is identical to ata_id_string except that it
670 * trims trailing spaces and terminates the resulting string with
671 * null. @len must be actual maximum length (even number) + 1.
676 void ata_id_c_string(const u16
*id
, unsigned char *s
,
677 unsigned int ofs
, unsigned int len
)
683 ata_id_string(id
, s
, ofs
, len
- 1);
685 p
= s
+ strnlen(s
, len
- 1);
686 while (p
> s
&& p
[-1] == ' ')
691 static u64
ata_id_n_sectors(const u16
*id
)
693 if (ata_id_has_lba(id
)) {
694 if (ata_id_has_lba48(id
))
695 return ata_id_u64(id
, 100);
697 return ata_id_u32(id
, 60);
699 if (ata_id_current_chs_valid(id
))
700 return ata_id_u32(id
, 57);
702 return id
[1] * id
[3] * id
[6];
707 * ata_noop_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * This function performs no actual function.
713 * May be used as the dev_select() entry in ata_port_operations.
718 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
724 * ata_std_dev_select - Select device 0/1 on ATA bus
725 * @ap: ATA channel to manipulate
726 * @device: ATA device (numbered from zero) to select
728 * Use the method defined in the ATA specification to
729 * make either device 0, or device 1, active on the
730 * ATA channel. Works with both PIO and MMIO.
732 * May be used as the dev_select() entry in ata_port_operations.
738 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
743 tmp
= ATA_DEVICE_OBS
;
745 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
747 if (ap
->flags
& ATA_FLAG_MMIO
) {
748 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
750 outb(tmp
, ap
->ioaddr
.device_addr
);
752 ata_pause(ap
); /* needed; also flushes, for mmio */
756 * ata_dev_select - Select device 0/1 on ATA bus
757 * @ap: ATA channel to manipulate
758 * @device: ATA device (numbered from zero) to select
759 * @wait: non-zero to wait for Status register BSY bit to clear
760 * @can_sleep: non-zero if context allows sleeping
762 * Use the method defined in the ATA specification to
763 * make either device 0, or device 1, active on the
766 * This is a high-level version of ata_std_dev_select(),
767 * which additionally provides the services of inserting
768 * the proper pauses and status polling, where needed.
774 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
775 unsigned int wait
, unsigned int can_sleep
)
777 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
778 ap
->id
, device
, wait
);
783 ap
->ops
->dev_select(ap
, device
);
786 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
793 * ata_dump_id - IDENTIFY DEVICE info debugging output
794 * @id: IDENTIFY DEVICE page to dump
796 * Dump selected 16-bit words from the given IDENTIFY DEVICE
803 static inline void ata_dump_id(const u16
*id
)
805 DPRINTK("49==0x%04x "
815 DPRINTK("80==0x%04x "
825 DPRINTK("88==0x%04x "
832 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
833 * @id: IDENTIFY data to compute xfer mask from
835 * Compute the xfermask for this device. This is not as trivial
836 * as it seems if we must consider early devices correctly.
838 * FIXME: pre IDE drive timing (do we care ?).
846 static unsigned int ata_id_xfermask(const u16
*id
)
848 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
850 /* Usual case. Word 53 indicates word 64 is valid */
851 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
852 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
856 /* If word 64 isn't valid then Word 51 high byte holds
857 * the PIO timing number for the maximum. Turn it into
860 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
862 /* But wait.. there's more. Design your standards by
863 * committee and you too can get a free iordy field to
864 * process. However its the speeds not the modes that
865 * are supported... Note drivers using the timing API
866 * will get this right anyway
870 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
873 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
874 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
876 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
880 * ata_port_queue_task - Queue port_task
881 * @ap: The ata_port to queue port_task for
883 * Schedule @fn(@data) for execution after @delay jiffies using
884 * port_task. There is one port_task per port and it's the
885 * user(low level driver)'s responsibility to make sure that only
886 * one task is active at any given time.
888 * libata core layer takes care of synchronization between
889 * port_task and EH. ata_port_queue_task() may be ignored for EH
893 * Inherited from caller.
895 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
900 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
903 PREPARE_WORK(&ap
->port_task
, fn
, data
);
906 rc
= queue_work(ata_wq
, &ap
->port_task
);
908 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
910 /* rc == 0 means that another user is using port task */
915 * ata_port_flush_task - Flush port_task
916 * @ap: The ata_port to flush port_task for
918 * After this function completes, port_task is guranteed not to
919 * be running or scheduled.
922 * Kernel thread context (may sleep)
924 void ata_port_flush_task(struct ata_port
*ap
)
930 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
931 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
932 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
934 DPRINTK("flush #1\n");
935 flush_workqueue(ata_wq
);
938 * At this point, if a task is running, it's guaranteed to see
939 * the FLUSH flag; thus, it will never queue pio tasks again.
942 if (!cancel_delayed_work(&ap
->port_task
)) {
943 DPRINTK("flush #2\n");
944 flush_workqueue(ata_wq
);
947 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
948 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
949 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
954 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
956 struct completion
*waiting
= qc
->private_data
;
958 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
963 * ata_exec_internal - execute libata internal command
964 * @ap: Port to which the command is sent
965 * @dev: Device to which the command is sent
966 * @tf: Taskfile registers for the command and the result
967 * @cdb: CDB for packet command
968 * @dma_dir: Data tranfer direction of the command
969 * @buf: Data buffer of the command
970 * @buflen: Length of data buffer
972 * Executes libata internal command with timeout. @tf contains
973 * command on entry and result on return. Timeout and error
974 * conditions are reported via return value. No recovery action
975 * is taken after a command times out. It's caller's duty to
976 * clean up after timeout.
979 * None. Should be called with kernel context, might sleep.
982 unsigned ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
983 struct ata_taskfile
*tf
, const u8
*cdb
,
984 int dma_dir
, void *buf
, unsigned int buflen
)
986 u8 command
= tf
->command
;
987 struct ata_queued_cmd
*qc
;
988 DECLARE_COMPLETION(wait
);
990 unsigned int err_mask
;
992 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
994 qc
= ata_qc_new_init(ap
, dev
);
999 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1000 qc
->dma_dir
= dma_dir
;
1001 if (dma_dir
!= DMA_NONE
) {
1002 ata_sg_init_one(qc
, buf
, buflen
);
1003 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1006 qc
->private_data
= &wait
;
1007 qc
->complete_fn
= ata_qc_complete_internal
;
1011 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1013 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1014 ata_port_flush_task(ap
);
1016 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1018 /* We're racing with irq here. If we lose, the
1019 * following test prevents us from completing the qc
1020 * again. If completion irq occurs after here but
1021 * before the caller cleans up, it will result in a
1022 * spurious interrupt. We can live with that.
1024 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1025 qc
->err_mask
= AC_ERR_TIMEOUT
;
1026 ata_qc_complete(qc
);
1027 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1031 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1035 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1038 err_mask
= qc
->err_mask
;
1042 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1043 * Until those drivers are fixed, we detect the condition
1044 * here, fail the command with AC_ERR_SYSTEM and reenable the
1047 * Note that this doesn't change any behavior as internal
1048 * command failure results in disabling the device in the
1049 * higher layer for LLDDs without new reset/EH callbacks.
1051 * Kill the following code as soon as those drivers are fixed.
1053 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1054 err_mask
|= AC_ERR_SYSTEM
;
1058 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1064 * ata_pio_need_iordy - check if iordy needed
1067 * Check if the current speed of the device requires IORDY. Used
1068 * by various controllers for chip configuration.
1071 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1074 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1081 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1083 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1084 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1085 /* Is the speed faster than the drive allows non IORDY ? */
1087 /* This is cycle times not frequency - watch the logic! */
1088 if (pio
> 240) /* PIO2 is 240nS per cycle */
1097 * ata_dev_read_id - Read ID data from the specified device
1098 * @ap: port on which target device resides
1099 * @dev: target device
1100 * @p_class: pointer to class of the target device (may be changed)
1101 * @post_reset: is this read ID post-reset?
1102 * @p_id: read IDENTIFY page (newly allocated)
1104 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1105 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1106 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1107 * for pre-ATA4 drives.
1110 * Kernel thread context (may sleep)
1113 * 0 on success, -errno otherwise.
1115 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1116 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1118 unsigned int class = *p_class
;
1119 struct ata_taskfile tf
;
1120 unsigned int err_mask
= 0;
1125 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1127 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1129 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1132 reason
= "out of memory";
1137 ata_tf_init(ap
, &tf
, dev
->devno
);
1141 tf
.command
= ATA_CMD_ID_ATA
;
1144 tf
.command
= ATA_CMD_ID_ATAPI
;
1148 reason
= "unsupported class";
1152 tf
.protocol
= ATA_PROT_PIO
;
1154 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1155 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1158 reason
= "I/O error";
1162 swap_buf_le16(id
, ATA_ID_WORDS
);
1165 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1167 reason
= "device reports illegal type";
1171 if (post_reset
&& class == ATA_DEV_ATA
) {
1173 * The exact sequence expected by certain pre-ATA4 drives is:
1176 * INITIALIZE DEVICE PARAMETERS
1178 * Some drives were very specific about that exact sequence.
1180 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1181 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1184 reason
= "INIT_DEV_PARAMS failed";
1188 /* current CHS translation info (id[53-58]) might be
1189 * changed. reread the identify device info.
1201 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1202 ap
->id
, dev
->devno
, reason
);
1207 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1208 struct ata_device
*dev
)
1210 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1214 * ata_dev_configure - Configure the specified ATA/ATAPI device
1215 * @ap: Port on which target device resides
1216 * @dev: Target device to configure
1217 * @print_info: Enable device info printout
1219 * Configure @dev according to @dev->id. Generic and low-level
1220 * driver specific fixups are also applied.
1223 * Kernel thread context (may sleep)
1226 * 0 on success, -errno otherwise
1228 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1231 const u16
*id
= dev
->id
;
1232 unsigned int xfer_mask
;
1235 if (!ata_dev_enabled(dev
)) {
1236 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1237 ap
->id
, dev
->devno
);
1241 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1243 /* print device capabilities */
1245 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1246 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1247 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1248 id
[84], id
[85], id
[86], id
[87], id
[88]);
1250 /* initialize to-be-configured parameters */
1251 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1252 dev
->max_sectors
= 0;
1260 * common ATA, ATAPI feature tests
1263 /* find max transfer mode; for printk only */
1264 xfer_mask
= ata_id_xfermask(id
);
1268 /* ATA-specific feature tests */
1269 if (dev
->class == ATA_DEV_ATA
) {
1270 dev
->n_sectors
= ata_id_n_sectors(id
);
1272 if (ata_id_has_lba(id
)) {
1273 const char *lba_desc
;
1276 dev
->flags
|= ATA_DFLAG_LBA
;
1277 if (ata_id_has_lba48(id
)) {
1278 dev
->flags
|= ATA_DFLAG_LBA48
;
1282 /* print device info to dmesg */
1284 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1285 "max %s, %Lu sectors: %s\n",
1287 ata_id_major_version(id
),
1288 ata_mode_string(xfer_mask
),
1289 (unsigned long long)dev
->n_sectors
,
1294 /* Default translation */
1295 dev
->cylinders
= id
[1];
1297 dev
->sectors
= id
[6];
1299 if (ata_id_current_chs_valid(id
)) {
1300 /* Current CHS translation is valid. */
1301 dev
->cylinders
= id
[54];
1302 dev
->heads
= id
[55];
1303 dev
->sectors
= id
[56];
1306 /* print device info to dmesg */
1308 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1309 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1311 ata_id_major_version(id
),
1312 ata_mode_string(xfer_mask
),
1313 (unsigned long long)dev
->n_sectors
,
1314 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1320 /* ATAPI-specific feature tests */
1321 else if (dev
->class == ATA_DEV_ATAPI
) {
1322 rc
= atapi_cdb_len(id
);
1323 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1324 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1328 dev
->cdb_len
= (unsigned int) rc
;
1330 /* print device info to dmesg */
1332 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1333 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1336 ap
->host
->max_cmd_len
= 0;
1337 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1338 ap
->host
->max_cmd_len
= max_t(unsigned int,
1339 ap
->host
->max_cmd_len
,
1340 ap
->device
[i
].cdb_len
);
1342 /* limit bridge transfers to udma5, 200 sectors */
1343 if (ata_dev_knobble(ap
, dev
)) {
1345 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1346 ap
->id
, dev
->devno
);
1347 dev
->udma_mask
&= ATA_UDMA5
;
1348 dev
->max_sectors
= ATA_MAX_SECTORS
;
1351 if (ap
->ops
->dev_config
)
1352 ap
->ops
->dev_config(ap
, dev
);
1354 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1358 DPRINTK("EXIT, err\n");
1363 * ata_bus_probe - Reset and probe ATA bus
1366 * Master ATA bus probing function. Initiates a hardware-dependent
1367 * bus reset, then attempts to identify any devices found on
1371 * PCI/etc. bus probe sem.
1374 * Zero on success, negative errno otherwise.
1377 static int ata_bus_probe(struct ata_port
*ap
)
1379 unsigned int classes
[ATA_MAX_DEVICES
];
1380 int tries
[ATA_MAX_DEVICES
];
1381 int i
, rc
, down_xfermask
;
1382 struct ata_device
*dev
;
1386 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1387 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1392 /* reset and determine device classes */
1393 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1394 classes
[i
] = ATA_DEV_UNKNOWN
;
1396 if (ap
->ops
->probe_reset
) {
1397 rc
= ap
->ops
->probe_reset(ap
, classes
);
1399 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1403 ap
->ops
->phy_reset(ap
);
1405 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1406 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1407 classes
[i
] = ap
->device
[i
].class;
1408 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1414 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1415 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1416 classes
[i
] = ATA_DEV_NONE
;
1418 /* read IDENTIFY page and configure devices */
1419 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1420 dev
= &ap
->device
[i
];
1423 dev
->class = classes
[i
];
1425 if (!ata_dev_enabled(dev
))
1430 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
);
1434 rc
= ata_dev_configure(ap
, dev
, 1);
1439 /* configure transfer mode */
1440 if (ap
->ops
->set_mode
) {
1441 /* FIXME: make ->set_mode handle no device case and
1442 * return error code and failing device on failure as
1443 * ata_set_mode() does.
1445 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1446 if (ata_dev_enabled(&ap
->device
[i
])) {
1447 ap
->ops
->set_mode(ap
);
1452 rc
= ata_set_mode(ap
, &dev
);
1459 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1460 if (ata_dev_enabled(&ap
->device
[i
]))
1463 /* no device present, disable port */
1464 ata_port_disable(ap
);
1465 ap
->ops
->port_disable(ap
);
1472 tries
[dev
->devno
] = 0;
1475 sata_down_spd_limit(ap
);
1478 tries
[dev
->devno
]--;
1479 if (down_xfermask
&&
1480 ata_down_xfermask_limit(ap
, dev
, tries
[dev
->devno
] == 1))
1481 tries
[dev
->devno
] = 0;
1484 if (!tries
[dev
->devno
]) {
1485 ata_down_xfermask_limit(ap
, dev
, 1);
1486 ata_dev_disable(ap
, dev
);
1493 * ata_port_probe - Mark port as enabled
1494 * @ap: Port for which we indicate enablement
1496 * Modify @ap data structure such that the system
1497 * thinks that the entire port is enabled.
1499 * LOCKING: host_set lock, or some other form of
1503 void ata_port_probe(struct ata_port
*ap
)
1505 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1509 * sata_print_link_status - Print SATA link status
1510 * @ap: SATA port to printk link status about
1512 * This function prints link speed and status of a SATA link.
1517 static void sata_print_link_status(struct ata_port
*ap
)
1519 u32 sstatus
, scontrol
, tmp
;
1521 if (!ap
->ops
->scr_read
)
1524 sstatus
= scr_read(ap
, SCR_STATUS
);
1525 scontrol
= scr_read(ap
, SCR_CONTROL
);
1527 if (sata_dev_present(ap
)) {
1528 tmp
= (sstatus
>> 4) & 0xf;
1530 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1531 ap
->id
, sata_spd_string(tmp
), sstatus
, scontrol
);
1534 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1535 ap
->id
, sstatus
, scontrol
);
1540 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1541 * @ap: SATA port associated with target SATA PHY.
1543 * This function issues commands to standard SATA Sxxx
1544 * PHY registers, to wake up the phy (and device), and
1545 * clear any reset condition.
1548 * PCI/etc. bus probe sem.
1551 void __sata_phy_reset(struct ata_port
*ap
)
1554 unsigned long timeout
= jiffies
+ (HZ
* 5);
1556 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1557 /* issue phy wake/reset */
1558 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1559 /* Couldn't find anything in SATA I/II specs, but
1560 * AHCI-1.1 10.4.2 says at least 1 ms. */
1563 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1565 /* wait for phy to become ready, if necessary */
1568 sstatus
= scr_read(ap
, SCR_STATUS
);
1569 if ((sstatus
& 0xf) != 1)
1571 } while (time_before(jiffies
, timeout
));
1573 /* print link status */
1574 sata_print_link_status(ap
);
1576 /* TODO: phy layer with polling, timeouts, etc. */
1577 if (sata_dev_present(ap
))
1580 ata_port_disable(ap
);
1582 if (ap
->flags
& ATA_FLAG_DISABLED
)
1585 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1586 ata_port_disable(ap
);
1590 ap
->cbl
= ATA_CBL_SATA
;
1594 * sata_phy_reset - Reset SATA bus.
1595 * @ap: SATA port associated with target SATA PHY.
1597 * This function resets the SATA bus, and then probes
1598 * the bus for devices.
1601 * PCI/etc. bus probe sem.
1604 void sata_phy_reset(struct ata_port
*ap
)
1606 __sata_phy_reset(ap
);
1607 if (ap
->flags
& ATA_FLAG_DISABLED
)
1613 * ata_dev_pair - return other device on cable
1617 * Obtain the other device on the same cable, or if none is
1618 * present NULL is returned
1621 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1623 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1624 if (!ata_dev_enabled(pair
))
1630 * ata_port_disable - Disable port.
1631 * @ap: Port to be disabled.
1633 * Modify @ap data structure such that the system
1634 * thinks that the entire port is disabled, and should
1635 * never attempt to probe or communicate with devices
1638 * LOCKING: host_set lock, or some other form of
1642 void ata_port_disable(struct ata_port
*ap
)
1644 ap
->device
[0].class = ATA_DEV_NONE
;
1645 ap
->device
[1].class = ATA_DEV_NONE
;
1646 ap
->flags
|= ATA_FLAG_DISABLED
;
1650 * sata_down_spd_limit - adjust SATA spd limit downward
1651 * @ap: Port to adjust SATA spd limit for
1653 * Adjust SATA spd limit of @ap downward. Note that this
1654 * function only adjusts the limit. The change must be applied
1655 * using sata_set_spd().
1658 * Inherited from caller.
1661 * 0 on success, negative errno on failure
1663 int sata_down_spd_limit(struct ata_port
*ap
)
1668 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1671 mask
= ap
->sata_spd_limit
;
1674 highbit
= fls(mask
) - 1;
1675 mask
&= ~(1 << highbit
);
1677 spd
= (scr_read(ap
, SCR_STATUS
) >> 4) & 0xf;
1681 mask
&= (1 << spd
) - 1;
1685 ap
->sata_spd_limit
= mask
;
1687 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1688 ap
->id
, sata_spd_string(fls(mask
)));
1693 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1697 if (ap
->sata_spd_limit
== UINT_MAX
)
1700 limit
= fls(ap
->sata_spd_limit
);
1702 spd
= (*scontrol
>> 4) & 0xf;
1703 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1705 return spd
!= limit
;
1709 * sata_set_spd_needed - is SATA spd configuration needed
1710 * @ap: Port in question
1712 * Test whether the spd limit in SControl matches
1713 * @ap->sata_spd_limit. This function is used to determine
1714 * whether hardreset is necessary to apply SATA spd
1718 * Inherited from caller.
1721 * 1 if SATA spd configuration is needed, 0 otherwise.
1723 int sata_set_spd_needed(struct ata_port
*ap
)
1727 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1730 scontrol
= scr_read(ap
, SCR_CONTROL
);
1732 return __sata_set_spd_needed(ap
, &scontrol
);
1736 * sata_set_spd - set SATA spd according to spd limit
1737 * @ap: Port to set SATA spd for
1739 * Set SATA spd of @ap according to sata_spd_limit.
1742 * Inherited from caller.
1745 * 0 if spd doesn't need to be changed, 1 if spd has been
1746 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1748 int sata_set_spd(struct ata_port
*ap
)
1752 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1755 scontrol
= scr_read(ap
, SCR_CONTROL
);
1756 if (!__sata_set_spd_needed(ap
, &scontrol
))
1759 scr_write(ap
, SCR_CONTROL
, scontrol
);
1764 * This mode timing computation functionality is ported over from
1765 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1768 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1769 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1770 * for PIO 5, which is a nonstandard extension and UDMA6, which
1771 * is currently supported only by Maxtor drives.
1774 static const struct ata_timing ata_timing
[] = {
1776 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1777 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1778 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1779 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1781 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1782 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1783 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1785 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1787 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1788 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1789 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1791 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1792 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1793 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1795 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1796 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1797 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1799 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1800 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1801 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1803 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1808 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1809 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1811 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1813 q
->setup
= EZ(t
->setup
* 1000, T
);
1814 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1815 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1816 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1817 q
->active
= EZ(t
->active
* 1000, T
);
1818 q
->recover
= EZ(t
->recover
* 1000, T
);
1819 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1820 q
->udma
= EZ(t
->udma
* 1000, UT
);
1823 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1824 struct ata_timing
*m
, unsigned int what
)
1826 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1827 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1828 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1829 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1830 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1831 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1832 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1833 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1836 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1838 const struct ata_timing
*t
;
1840 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1841 if (t
->mode
== 0xFF)
1846 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1847 struct ata_timing
*t
, int T
, int UT
)
1849 const struct ata_timing
*s
;
1850 struct ata_timing p
;
1856 if (!(s
= ata_timing_find_mode(speed
)))
1859 memcpy(t
, s
, sizeof(*s
));
1862 * If the drive is an EIDE drive, it can tell us it needs extended
1863 * PIO/MW_DMA cycle timing.
1866 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1867 memset(&p
, 0, sizeof(p
));
1868 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1869 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1870 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1871 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1872 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1874 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1878 * Convert the timing to bus clock counts.
1881 ata_timing_quantize(t
, t
, T
, UT
);
1884 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1885 * S.M.A.R.T * and some other commands. We have to ensure that the
1886 * DMA cycle timing is slower/equal than the fastest PIO timing.
1889 if (speed
> XFER_PIO_4
) {
1890 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1891 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1895 * Lengthen active & recovery time so that cycle time is correct.
1898 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1899 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1900 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1903 if (t
->active
+ t
->recover
< t
->cycle
) {
1904 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1905 t
->recover
= t
->cycle
- t
->active
;
1912 * ata_down_xfermask_limit - adjust dev xfer masks downward
1913 * @ap: Port associated with device @dev
1914 * @dev: Device to adjust xfer masks
1915 * @force_pio0: Force PIO0
1917 * Adjust xfer masks of @dev downward. Note that this function
1918 * does not apply the change. Invoking ata_set_mode() afterwards
1919 * will apply the limit.
1922 * Inherited from caller.
1925 * 0 on success, negative errno on failure
1927 int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
1930 unsigned long xfer_mask
;
1933 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1938 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1939 if (xfer_mask
& ATA_MASK_UDMA
)
1940 xfer_mask
&= ~ATA_MASK_MWDMA
;
1942 highbit
= fls(xfer_mask
) - 1;
1943 xfer_mask
&= ~(1 << highbit
);
1945 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1949 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1952 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1953 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1961 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1963 unsigned int err_mask
;
1966 dev
->flags
&= ~ATA_DFLAG_PIO
;
1967 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1968 dev
->flags
|= ATA_DFLAG_PIO
;
1970 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1973 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1978 rc
= ata_dev_revalidate(ap
, dev
, 0);
1982 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1983 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1985 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1987 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1992 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1993 * @ap: port on which timings will be programmed
1994 * @r_failed_dev: out paramter for failed device
1996 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1997 * ata_set_mode() fails, pointer to the failing device is
1998 * returned in @r_failed_dev.
2001 * PCI/etc. bus probe sem.
2004 * 0 on success, negative errno otherwise
2006 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2008 struct ata_device
*dev
;
2009 int i
, rc
= 0, used_dma
= 0, found
= 0;
2011 /* step 1: calculate xfer_mask */
2012 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2013 unsigned int pio_mask
, dma_mask
;
2015 dev
= &ap
->device
[i
];
2017 if (!ata_dev_enabled(dev
))
2020 ata_dev_xfermask(ap
, dev
);
2022 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2023 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2024 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2025 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2034 /* step 2: always set host PIO timings */
2035 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2036 dev
= &ap
->device
[i
];
2037 if (!ata_dev_enabled(dev
))
2040 if (!dev
->pio_mode
) {
2041 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2042 ap
->id
, dev
->devno
);
2047 dev
->xfer_mode
= dev
->pio_mode
;
2048 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2049 if (ap
->ops
->set_piomode
)
2050 ap
->ops
->set_piomode(ap
, dev
);
2053 /* step 3: set host DMA timings */
2054 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2055 dev
= &ap
->device
[i
];
2057 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2060 dev
->xfer_mode
= dev
->dma_mode
;
2061 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2062 if (ap
->ops
->set_dmamode
)
2063 ap
->ops
->set_dmamode(ap
, dev
);
2066 /* step 4: update devices' xfer mode */
2067 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2068 dev
= &ap
->device
[i
];
2070 if (!ata_dev_enabled(dev
))
2073 rc
= ata_dev_set_mode(ap
, dev
);
2078 /* Record simplex status. If we selected DMA then the other
2079 * host channels are not permitted to do so.
2081 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2082 ap
->host_set
->simplex_claimed
= 1;
2084 /* step5: chip specific finalisation */
2085 if (ap
->ops
->post_set_mode
)
2086 ap
->ops
->post_set_mode(ap
);
2090 *r_failed_dev
= dev
;
2095 * ata_tf_to_host - issue ATA taskfile to host controller
2096 * @ap: port to which command is being issued
2097 * @tf: ATA taskfile register set
2099 * Issues ATA taskfile register set to ATA host controller,
2100 * with proper synchronization with interrupt handler and
2104 * spin_lock_irqsave(host_set lock)
2107 static inline void ata_tf_to_host(struct ata_port
*ap
,
2108 const struct ata_taskfile
*tf
)
2110 ap
->ops
->tf_load(ap
, tf
);
2111 ap
->ops
->exec_command(ap
, tf
);
2115 * ata_busy_sleep - sleep until BSY clears, or timeout
2116 * @ap: port containing status register to be polled
2117 * @tmout_pat: impatience timeout
2118 * @tmout: overall timeout
2120 * Sleep until ATA Status register bit BSY clears,
2121 * or a timeout occurs.
2126 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2127 unsigned long tmout_pat
, unsigned long tmout
)
2129 unsigned long timer_start
, timeout
;
2132 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2133 timer_start
= jiffies
;
2134 timeout
= timer_start
+ tmout_pat
;
2135 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2137 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2140 if (status
& ATA_BUSY
)
2141 printk(KERN_WARNING
"ata%u is slow to respond, "
2142 "please be patient\n", ap
->id
);
2144 timeout
= timer_start
+ tmout
;
2145 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2147 status
= ata_chk_status(ap
);
2150 if (status
& ATA_BUSY
) {
2151 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2152 ap
->id
, tmout
/ HZ
);
2159 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2161 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2162 unsigned int dev0
= devmask
& (1 << 0);
2163 unsigned int dev1
= devmask
& (1 << 1);
2164 unsigned long timeout
;
2166 /* if device 0 was found in ata_devchk, wait for its
2170 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2172 /* if device 1 was found in ata_devchk, wait for
2173 * register access, then wait for BSY to clear
2175 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2179 ap
->ops
->dev_select(ap
, 1);
2180 if (ap
->flags
& ATA_FLAG_MMIO
) {
2181 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2182 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2184 nsect
= inb(ioaddr
->nsect_addr
);
2185 lbal
= inb(ioaddr
->lbal_addr
);
2187 if ((nsect
== 1) && (lbal
== 1))
2189 if (time_after(jiffies
, timeout
)) {
2193 msleep(50); /* give drive a breather */
2196 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2198 /* is all this really necessary? */
2199 ap
->ops
->dev_select(ap
, 0);
2201 ap
->ops
->dev_select(ap
, 1);
2203 ap
->ops
->dev_select(ap
, 0);
2206 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2207 unsigned int devmask
)
2209 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2211 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2213 /* software reset. causes dev0 to be selected */
2214 if (ap
->flags
& ATA_FLAG_MMIO
) {
2215 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2216 udelay(20); /* FIXME: flush */
2217 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2218 udelay(20); /* FIXME: flush */
2219 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2221 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2223 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2225 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2228 /* spec mandates ">= 2ms" before checking status.
2229 * We wait 150ms, because that was the magic delay used for
2230 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2231 * between when the ATA command register is written, and then
2232 * status is checked. Because waiting for "a while" before
2233 * checking status is fine, post SRST, we perform this magic
2234 * delay here as well.
2236 * Old drivers/ide uses the 2mS rule and then waits for ready
2240 /* Before we perform post reset processing we want to see if
2241 * the bus shows 0xFF because the odd clown forgets the D7
2242 * pulldown resistor.
2244 if (ata_check_status(ap
) == 0xFF) {
2245 printk(KERN_ERR
"ata%u: SRST failed (status 0xFF)\n", ap
->id
);
2246 return AC_ERR_OTHER
;
2249 ata_bus_post_reset(ap
, devmask
);
2255 * ata_bus_reset - reset host port and associated ATA channel
2256 * @ap: port to reset
2258 * This is typically the first time we actually start issuing
2259 * commands to the ATA channel. We wait for BSY to clear, then
2260 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2261 * result. Determine what devices, if any, are on the channel
2262 * by looking at the device 0/1 error register. Look at the signature
2263 * stored in each device's taskfile registers, to determine if
2264 * the device is ATA or ATAPI.
2267 * PCI/etc. bus probe sem.
2268 * Obtains host_set lock.
2271 * Sets ATA_FLAG_DISABLED if bus reset fails.
2274 void ata_bus_reset(struct ata_port
*ap
)
2276 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2277 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2279 unsigned int dev0
, dev1
= 0, devmask
= 0;
2281 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2283 /* determine if device 0/1 are present */
2284 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2287 dev0
= ata_devchk(ap
, 0);
2289 dev1
= ata_devchk(ap
, 1);
2293 devmask
|= (1 << 0);
2295 devmask
|= (1 << 1);
2297 /* select device 0 again */
2298 ap
->ops
->dev_select(ap
, 0);
2300 /* issue bus reset */
2301 if (ap
->flags
& ATA_FLAG_SRST
)
2302 if (ata_bus_softreset(ap
, devmask
))
2306 * determine by signature whether we have ATA or ATAPI devices
2308 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2309 if ((slave_possible
) && (err
!= 0x81))
2310 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2312 /* re-enable interrupts */
2313 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2316 /* is double-select really necessary? */
2317 if (ap
->device
[1].class != ATA_DEV_NONE
)
2318 ap
->ops
->dev_select(ap
, 1);
2319 if (ap
->device
[0].class != ATA_DEV_NONE
)
2320 ap
->ops
->dev_select(ap
, 0);
2322 /* if no devices were detected, disable this port */
2323 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2324 (ap
->device
[1].class == ATA_DEV_NONE
))
2327 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2328 /* set up device control for ATA_FLAG_SATA_RESET */
2329 if (ap
->flags
& ATA_FLAG_MMIO
)
2330 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2332 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2339 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2340 ap
->ops
->port_disable(ap
);
2345 static int sata_phy_resume(struct ata_port
*ap
)
2347 unsigned long timeout
= jiffies
+ (HZ
* 5);
2348 u32 scontrol
, sstatus
;
2350 scontrol
= scr_read(ap
, SCR_CONTROL
);
2351 scontrol
= (scontrol
& 0x0f0) | 0x300;
2352 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2354 /* Wait for phy to become ready, if necessary. */
2357 sstatus
= scr_read(ap
, SCR_STATUS
);
2358 if ((sstatus
& 0xf) != 1)
2360 } while (time_before(jiffies
, timeout
));
2366 * ata_std_probeinit - initialize probing
2367 * @ap: port to be probed
2369 * @ap is about to be probed. Initialize it. This function is
2370 * to be used as standard callback for ata_drive_probe_reset().
2372 * NOTE!!! Do not use this function as probeinit if a low level
2373 * driver implements only hardreset. Just pass NULL as probeinit
2374 * in that case. Using this function is probably okay but doing
2375 * so makes reset sequence different from the original
2376 * ->phy_reset implementation and Jeff nervous. :-P
2378 void ata_std_probeinit(struct ata_port
*ap
)
2380 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2383 /* set cable type and resume link */
2384 ap
->cbl
= ATA_CBL_SATA
;
2385 sata_phy_resume(ap
);
2387 /* init sata_spd_limit to the current value */
2388 spd
= (scr_read(ap
, SCR_CONTROL
) & 0xf0) >> 4;
2390 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2392 /* wait for device */
2393 if (sata_dev_present(ap
))
2394 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2399 * ata_std_softreset - reset host port via ATA SRST
2400 * @ap: port to reset
2401 * @classes: resulting classes of attached devices
2403 * Reset host port using ATA SRST. This function is to be used
2404 * as standard callback for ata_drive_*_reset() functions.
2407 * Kernel thread context (may sleep)
2410 * 0 on success, -errno otherwise.
2412 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2414 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2415 unsigned int devmask
= 0, err_mask
;
2420 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2421 classes
[0] = ATA_DEV_NONE
;
2425 /* determine if device 0/1 are present */
2426 if (ata_devchk(ap
, 0))
2427 devmask
|= (1 << 0);
2428 if (slave_possible
&& ata_devchk(ap
, 1))
2429 devmask
|= (1 << 1);
2431 /* select device 0 again */
2432 ap
->ops
->dev_select(ap
, 0);
2434 /* issue bus reset */
2435 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2436 err_mask
= ata_bus_softreset(ap
, devmask
);
2438 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2443 /* determine by signature whether we have ATA or ATAPI devices */
2444 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2445 if (slave_possible
&& err
!= 0x81)
2446 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2449 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2454 * sata_std_hardreset - reset host port via SATA phy reset
2455 * @ap: port to reset
2456 * @class: resulting class of attached device
2458 * SATA phy-reset host port using DET bits of SControl register.
2459 * This function is to be used as standard callback for
2460 * ata_drive_*_reset().
2463 * Kernel thread context (may sleep)
2466 * 0 on success, -errno otherwise.
2468 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2474 if (sata_set_spd_needed(ap
)) {
2475 /* SATA spec says nothing about how to reconfigure
2476 * spd. To be on the safe side, turn off phy during
2477 * reconfiguration. This works for at least ICH7 AHCI
2480 scontrol
= scr_read(ap
, SCR_CONTROL
);
2481 scontrol
= (scontrol
& 0x0f0) | 0x302;
2482 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2487 /* issue phy wake/reset */
2488 scontrol
= scr_read(ap
, SCR_CONTROL
);
2489 scontrol
= (scontrol
& 0x0f0) | 0x301;
2490 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2492 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2493 * 10.4.2 says at least 1 ms.
2497 /* bring phy back */
2498 sata_phy_resume(ap
);
2500 /* TODO: phy layer with polling, timeouts, etc. */
2501 if (!sata_dev_present(ap
)) {
2502 *class = ATA_DEV_NONE
;
2503 DPRINTK("EXIT, link offline\n");
2507 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2509 "ata%u: COMRESET failed (device not ready)\n", ap
->id
);
2513 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2515 *class = ata_dev_try_classify(ap
, 0, NULL
);
2517 DPRINTK("EXIT, class=%u\n", *class);
2522 * ata_std_postreset - standard postreset callback
2523 * @ap: the target ata_port
2524 * @classes: classes of attached devices
2526 * This function is invoked after a successful reset. Note that
2527 * the device might have been reset more than once using
2528 * different reset methods before postreset is invoked.
2530 * This function is to be used as standard callback for
2531 * ata_drive_*_reset().
2534 * Kernel thread context (may sleep)
2536 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2540 /* print link status */
2541 if (ap
->cbl
== ATA_CBL_SATA
)
2542 sata_print_link_status(ap
);
2544 /* re-enable interrupts */
2545 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2548 /* is double-select really necessary? */
2549 if (classes
[0] != ATA_DEV_NONE
)
2550 ap
->ops
->dev_select(ap
, 1);
2551 if (classes
[1] != ATA_DEV_NONE
)
2552 ap
->ops
->dev_select(ap
, 0);
2554 /* bail out if no device is present */
2555 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2556 DPRINTK("EXIT, no device\n");
2560 /* set up device control */
2561 if (ap
->ioaddr
.ctl_addr
) {
2562 if (ap
->flags
& ATA_FLAG_MMIO
)
2563 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2565 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2572 * ata_std_probe_reset - standard probe reset method
2573 * @ap: prot to perform probe-reset
2574 * @classes: resulting classes of attached devices
2576 * The stock off-the-shelf ->probe_reset method.
2579 * Kernel thread context (may sleep)
2582 * 0 on success, -errno otherwise.
2584 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2586 ata_reset_fn_t hardreset
;
2589 if (ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
)
2590 hardreset
= sata_std_hardreset
;
2592 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2593 ata_std_softreset
, hardreset
,
2594 ata_std_postreset
, classes
);
2597 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2598 ata_postreset_fn_t postreset
, unsigned int *classes
)
2602 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2603 classes
[i
] = ATA_DEV_UNKNOWN
;
2605 rc
= reset(ap
, classes
);
2609 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2610 * is complete and convert all ATA_DEV_UNKNOWN to
2613 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2614 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2617 if (i
< ATA_MAX_DEVICES
)
2618 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2619 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2620 classes
[i
] = ATA_DEV_NONE
;
2623 postreset(ap
, classes
);
2629 * ata_drive_probe_reset - Perform probe reset with given methods
2630 * @ap: port to reset
2631 * @probeinit: probeinit method (can be NULL)
2632 * @softreset: softreset method (can be NULL)
2633 * @hardreset: hardreset method (can be NULL)
2634 * @postreset: postreset method (can be NULL)
2635 * @classes: resulting classes of attached devices
2637 * Reset the specified port and classify attached devices using
2638 * given methods. This function prefers softreset but tries all
2639 * possible reset sequences to reset and classify devices. This
2640 * function is intended to be used for constructing ->probe_reset
2641 * callback by low level drivers.
2643 * Reset methods should follow the following rules.
2645 * - Return 0 on sucess, -errno on failure.
2646 * - If classification is supported, fill classes[] with
2647 * recognized class codes.
2648 * - If classification is not supported, leave classes[] alone.
2651 * Kernel thread context (may sleep)
2654 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2655 * if classification fails, and any error code from reset
2658 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2659 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2660 ata_postreset_fn_t postreset
, unsigned int *classes
)
2667 if (softreset
&& !sata_set_spd_needed(ap
)) {
2668 rc
= ata_do_reset(ap
, softreset
, postreset
, classes
);
2669 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2671 printk(KERN_INFO
"ata%u: softreset failed, will try "
2672 "hardreset in 5 secs\n", ap
->id
);
2680 rc
= ata_do_reset(ap
, hardreset
, postreset
, classes
);
2682 if (classes
[0] != ATA_DEV_UNKNOWN
)
2687 if (sata_down_spd_limit(ap
))
2690 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2691 "in 5 secs\n", ap
->id
);
2696 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2697 "classification, will retry softreset in 5 secs\n",
2701 rc
= ata_do_reset(ap
, softreset
, postreset
, classes
);
2705 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2711 * ata_dev_same_device - Determine whether new ID matches configured device
2712 * @ap: port on which the device to compare against resides
2713 * @dev: device to compare against
2714 * @new_class: class of the new device
2715 * @new_id: IDENTIFY page of the new device
2717 * Compare @new_class and @new_id against @dev and determine
2718 * whether @dev is the device indicated by @new_class and
2725 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2727 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2728 unsigned int new_class
, const u16
*new_id
)
2730 const u16
*old_id
= dev
->id
;
2731 unsigned char model
[2][41], serial
[2][21];
2734 if (dev
->class != new_class
) {
2736 "ata%u: dev %u class mismatch %d != %d\n",
2737 ap
->id
, dev
->devno
, dev
->class, new_class
);
2741 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2742 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2743 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2744 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2745 new_n_sectors
= ata_id_n_sectors(new_id
);
2747 if (strcmp(model
[0], model
[1])) {
2749 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2750 ap
->id
, dev
->devno
, model
[0], model
[1]);
2754 if (strcmp(serial
[0], serial
[1])) {
2756 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2757 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2761 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2763 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2764 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2765 (unsigned long long)new_n_sectors
);
2773 * ata_dev_revalidate - Revalidate ATA device
2774 * @ap: port on which the device to revalidate resides
2775 * @dev: device to revalidate
2776 * @post_reset: is this revalidation after reset?
2778 * Re-read IDENTIFY page and make sure @dev is still attached to
2782 * Kernel thread context (may sleep)
2785 * 0 on success, negative errno otherwise
2787 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2790 unsigned int class = dev
->class;
2794 if (!ata_dev_enabled(dev
)) {
2799 /* allocate & read ID data */
2800 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2804 /* is the device still there? */
2805 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2813 /* configure device according to the new ID */
2814 rc
= ata_dev_configure(ap
, dev
, 0);
2819 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2820 ap
->id
, dev
->devno
, rc
);
2825 static const char * const ata_dma_blacklist
[] = {
2826 "WDC AC11000H", NULL
,
2827 "WDC AC22100H", NULL
,
2828 "WDC AC32500H", NULL
,
2829 "WDC AC33100H", NULL
,
2830 "WDC AC31600H", NULL
,
2831 "WDC AC32100H", "24.09P07",
2832 "WDC AC23200L", "21.10N21",
2833 "Compaq CRD-8241B", NULL
,
2838 "SanDisk SDP3B", NULL
,
2839 "SanDisk SDP3B-64", NULL
,
2840 "SANYO CD-ROM CRD", NULL
,
2841 "HITACHI CDR-8", NULL
,
2842 "HITACHI CDR-8335", NULL
,
2843 "HITACHI CDR-8435", NULL
,
2844 "Toshiba CD-ROM XM-6202B", NULL
,
2845 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2847 "E-IDE CD-ROM CR-840", NULL
,
2848 "CD-ROM Drive/F5A", NULL
,
2849 "WPI CDD-820", NULL
,
2850 "SAMSUNG CD-ROM SC-148C", NULL
,
2851 "SAMSUNG CD-ROM SC", NULL
,
2852 "SanDisk SDP3B-64", NULL
,
2853 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2854 "_NEC DV5800A", NULL
,
2855 "SAMSUNG CD-ROM SN-124", "N001"
2858 static int ata_strim(char *s
, size_t len
)
2860 len
= strnlen(s
, len
);
2862 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2863 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2870 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2872 unsigned char model_num
[40];
2873 unsigned char model_rev
[16];
2874 unsigned int nlen
, rlen
;
2877 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2879 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2881 nlen
= ata_strim(model_num
, sizeof(model_num
));
2882 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2884 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2885 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2886 if (ata_dma_blacklist
[i
+1] == NULL
)
2888 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2896 * ata_dev_xfermask - Compute supported xfermask of the given device
2897 * @ap: Port on which the device to compute xfermask for resides
2898 * @dev: Device to compute xfermask for
2900 * Compute supported xfermask of @dev and store it in
2901 * dev->*_mask. This function is responsible for applying all
2902 * known limits including host controller limits, device
2905 * FIXME: The current implementation limits all transfer modes to
2906 * the fastest of the lowested device on the port. This is not
2907 * required on most controllers.
2912 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2914 struct ata_host_set
*hs
= ap
->host_set
;
2915 unsigned long xfer_mask
;
2918 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2919 ap
->mwdma_mask
, ap
->udma_mask
);
2921 /* Apply cable rule here. Don't apply it early because when
2922 * we handle hot plug the cable type can itself change.
2924 if (ap
->cbl
== ATA_CBL_PATA40
)
2925 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2927 /* FIXME: Use port-wide xfermask for now */
2928 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2929 struct ata_device
*d
= &ap
->device
[i
];
2931 if (ata_dev_absent(d
))
2934 if (ata_dev_disabled(d
)) {
2935 /* to avoid violating device selection timing */
2936 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2937 UINT_MAX
, UINT_MAX
);
2941 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2942 d
->mwdma_mask
, d
->udma_mask
);
2943 xfer_mask
&= ata_id_xfermask(d
->id
);
2944 if (ata_dma_blacklisted(d
))
2945 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2948 if (ata_dma_blacklisted(dev
))
2949 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2950 "disabling DMA\n", ap
->id
, dev
->devno
);
2952 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2953 if (hs
->simplex_claimed
)
2954 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2957 if (ap
->ops
->mode_filter
)
2958 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2960 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2961 &dev
->mwdma_mask
, &dev
->udma_mask
);
2965 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2966 * @ap: Port associated with device @dev
2967 * @dev: Device to which command will be sent
2969 * Issue SET FEATURES - XFER MODE command to device @dev
2973 * PCI/etc. bus probe sem.
2976 * 0 on success, AC_ERR_* mask otherwise.
2979 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2980 struct ata_device
*dev
)
2982 struct ata_taskfile tf
;
2983 unsigned int err_mask
;
2985 /* set up set-features taskfile */
2986 DPRINTK("set features - xfer mode\n");
2988 ata_tf_init(ap
, &tf
, dev
->devno
);
2989 tf
.command
= ATA_CMD_SET_FEATURES
;
2990 tf
.feature
= SETFEATURES_XFER
;
2991 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2992 tf
.protocol
= ATA_PROT_NODATA
;
2993 tf
.nsect
= dev
->xfer_mode
;
2995 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
2997 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3002 * ata_dev_init_params - Issue INIT DEV PARAMS command
3003 * @ap: Port associated with device @dev
3004 * @dev: Device to which command will be sent
3007 * Kernel thread context (may sleep)
3010 * 0 on success, AC_ERR_* mask otherwise.
3013 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
3014 struct ata_device
*dev
,
3018 struct ata_taskfile tf
;
3019 unsigned int err_mask
;
3021 /* Number of sectors per track 1-255. Number of heads 1-16 */
3022 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3023 return AC_ERR_INVALID
;
3025 /* set up init dev params taskfile */
3026 DPRINTK("init dev params \n");
3028 ata_tf_init(ap
, &tf
, dev
->devno
);
3029 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3030 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3031 tf
.protocol
= ATA_PROT_NODATA
;
3033 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3035 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3037 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3042 * ata_sg_clean - Unmap DMA memory associated with command
3043 * @qc: Command containing DMA memory to be released
3045 * Unmap all mapped DMA memory associated with this command.
3048 * spin_lock_irqsave(host_set lock)
3051 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3053 struct ata_port
*ap
= qc
->ap
;
3054 struct scatterlist
*sg
= qc
->__sg
;
3055 int dir
= qc
->dma_dir
;
3056 void *pad_buf
= NULL
;
3058 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3059 WARN_ON(sg
== NULL
);
3061 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3062 WARN_ON(qc
->n_elem
> 1);
3064 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3066 /* if we padded the buffer out to 32-bit bound, and data
3067 * xfer direction is from-device, we must copy from the
3068 * pad buffer back into the supplied buffer
3070 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3071 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3073 if (qc
->flags
& ATA_QCFLAG_SG
) {
3075 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3076 /* restore last sg */
3077 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3079 struct scatterlist
*psg
= &qc
->pad_sgent
;
3080 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3081 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3082 kunmap_atomic(addr
, KM_IRQ0
);
3086 dma_unmap_single(ap
->dev
,
3087 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3090 sg
->length
+= qc
->pad_len
;
3092 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3093 pad_buf
, qc
->pad_len
);
3096 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3101 * ata_fill_sg - Fill PCI IDE PRD table
3102 * @qc: Metadata associated with taskfile to be transferred
3104 * Fill PCI IDE PRD (scatter-gather) table with segments
3105 * associated with the current disk command.
3108 * spin_lock_irqsave(host_set lock)
3111 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3113 struct ata_port
*ap
= qc
->ap
;
3114 struct scatterlist
*sg
;
3117 WARN_ON(qc
->__sg
== NULL
);
3118 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3121 ata_for_each_sg(sg
, qc
) {
3125 /* determine if physical DMA addr spans 64K boundary.
3126 * Note h/w doesn't support 64-bit, so we unconditionally
3127 * truncate dma_addr_t to u32.
3129 addr
= (u32
) sg_dma_address(sg
);
3130 sg_len
= sg_dma_len(sg
);
3133 offset
= addr
& 0xffff;
3135 if ((offset
+ sg_len
) > 0x10000)
3136 len
= 0x10000 - offset
;
3138 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3139 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3140 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3149 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3152 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3153 * @qc: Metadata associated with taskfile to check
3155 * Allow low-level driver to filter ATA PACKET commands, returning
3156 * a status indicating whether or not it is OK to use DMA for the
3157 * supplied PACKET command.
3160 * spin_lock_irqsave(host_set lock)
3162 * RETURNS: 0 when ATAPI DMA can be used
3165 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3167 struct ata_port
*ap
= qc
->ap
;
3168 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3170 if (ap
->ops
->check_atapi_dma
)
3171 rc
= ap
->ops
->check_atapi_dma(qc
);
3176 * ata_qc_prep - Prepare taskfile for submission
3177 * @qc: Metadata associated with taskfile to be prepared
3179 * Prepare ATA taskfile for submission.
3182 * spin_lock_irqsave(host_set lock)
3184 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3186 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3192 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3195 * ata_sg_init_one - Associate command with memory buffer
3196 * @qc: Command to be associated
3197 * @buf: Memory buffer
3198 * @buflen: Length of memory buffer, in bytes.
3200 * Initialize the data-related elements of queued_cmd @qc
3201 * to point to a single memory buffer, @buf of byte length @buflen.
3204 * spin_lock_irqsave(host_set lock)
3207 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3209 struct scatterlist
*sg
;
3211 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3213 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3214 qc
->__sg
= &qc
->sgent
;
3216 qc
->orig_n_elem
= 1;
3220 sg_init_one(sg
, buf
, buflen
);
3224 * ata_sg_init - Associate command with scatter-gather table.
3225 * @qc: Command to be associated
3226 * @sg: Scatter-gather table.
3227 * @n_elem: Number of elements in s/g table.
3229 * Initialize the data-related elements of queued_cmd @qc
3230 * to point to a scatter-gather table @sg, containing @n_elem
3234 * spin_lock_irqsave(host_set lock)
3237 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3238 unsigned int n_elem
)
3240 qc
->flags
|= ATA_QCFLAG_SG
;
3242 qc
->n_elem
= n_elem
;
3243 qc
->orig_n_elem
= n_elem
;
3247 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3248 * @qc: Command with memory buffer to be mapped.
3250 * DMA-map the memory buffer associated with queued_cmd @qc.
3253 * spin_lock_irqsave(host_set lock)
3256 * Zero on success, negative on error.
3259 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3261 struct ata_port
*ap
= qc
->ap
;
3262 int dir
= qc
->dma_dir
;
3263 struct scatterlist
*sg
= qc
->__sg
;
3264 dma_addr_t dma_address
;
3267 /* we must lengthen transfers to end on a 32-bit boundary */
3268 qc
->pad_len
= sg
->length
& 3;
3270 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3271 struct scatterlist
*psg
= &qc
->pad_sgent
;
3273 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3275 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3277 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3278 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3281 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3282 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3284 sg
->length
-= qc
->pad_len
;
3285 if (sg
->length
== 0)
3288 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3289 sg
->length
, qc
->pad_len
);
3297 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3299 if (dma_mapping_error(dma_address
)) {
3301 sg
->length
+= qc
->pad_len
;
3305 sg_dma_address(sg
) = dma_address
;
3306 sg_dma_len(sg
) = sg
->length
;
3309 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3310 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3316 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3317 * @qc: Command with scatter-gather table to be mapped.
3319 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3322 * spin_lock_irqsave(host_set lock)
3325 * Zero on success, negative on error.
3329 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3331 struct ata_port
*ap
= qc
->ap
;
3332 struct scatterlist
*sg
= qc
->__sg
;
3333 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3334 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3336 VPRINTK("ENTER, ata%u\n", ap
->id
);
3337 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3339 /* we must lengthen transfers to end on a 32-bit boundary */
3340 qc
->pad_len
= lsg
->length
& 3;
3342 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3343 struct scatterlist
*psg
= &qc
->pad_sgent
;
3344 unsigned int offset
;
3346 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3348 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3351 * psg->page/offset are used to copy to-be-written
3352 * data in this function or read data in ata_sg_clean.
3354 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3355 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3356 psg
->offset
= offset_in_page(offset
);
3358 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3359 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3360 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3361 kunmap_atomic(addr
, KM_IRQ0
);
3364 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3365 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3367 lsg
->length
-= qc
->pad_len
;
3368 if (lsg
->length
== 0)
3371 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3372 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3375 pre_n_elem
= qc
->n_elem
;
3376 if (trim_sg
&& pre_n_elem
)
3385 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3387 /* restore last sg */
3388 lsg
->length
+= qc
->pad_len
;
3392 DPRINTK("%d sg elements mapped\n", n_elem
);
3395 qc
->n_elem
= n_elem
;
3401 * ata_poll_qc_complete - turn irq back on and finish qc
3402 * @qc: Command to complete
3403 * @err_mask: ATA status register content
3406 * None. (grabs host lock)
3409 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3411 struct ata_port
*ap
= qc
->ap
;
3412 unsigned long flags
;
3414 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3415 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3417 ata_qc_complete(qc
);
3418 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3422 * ata_pio_poll - poll using PIO, depending on current state
3423 * @qc: qc in progress
3426 * None. (executing in kernel thread context)
3429 * timeout value to use
3431 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3433 struct ata_port
*ap
= qc
->ap
;
3435 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3436 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3438 switch (ap
->hsm_task_state
) {
3441 poll_state
= HSM_ST_POLL
;
3445 case HSM_ST_LAST_POLL
:
3446 poll_state
= HSM_ST_LAST_POLL
;
3447 reg_state
= HSM_ST_LAST
;
3454 status
= ata_chk_status(ap
);
3455 if (status
& ATA_BUSY
) {
3456 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3457 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3458 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3461 ap
->hsm_task_state
= poll_state
;
3462 return ATA_SHORT_PAUSE
;
3465 ap
->hsm_task_state
= reg_state
;
3470 * ata_pio_complete - check if drive is busy or idle
3471 * @qc: qc to complete
3474 * None. (executing in kernel thread context)
3477 * Non-zero if qc completed, zero otherwise.
3479 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3481 struct ata_port
*ap
= qc
->ap
;
3485 * This is purely heuristic. This is a fast path. Sometimes when
3486 * we enter, BSY will be cleared in a chk-status or two. If not,
3487 * the drive is probably seeking or something. Snooze for a couple
3488 * msecs, then chk-status again. If still busy, fall back to
3489 * HSM_ST_POLL state.
3491 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3492 if (drv_stat
& ATA_BUSY
) {
3494 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3495 if (drv_stat
& ATA_BUSY
) {
3496 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3497 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3502 drv_stat
= ata_wait_idle(ap
);
3503 if (!ata_ok(drv_stat
)) {
3504 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3505 ap
->hsm_task_state
= HSM_ST_ERR
;
3509 ap
->hsm_task_state
= HSM_ST_IDLE
;
3511 WARN_ON(qc
->err_mask
);
3512 ata_poll_qc_complete(qc
);
3514 /* another command may start at this point */
3521 * swap_buf_le16 - swap halves of 16-bit words in place
3522 * @buf: Buffer to swap
3523 * @buf_words: Number of 16-bit words in buffer.
3525 * Swap halves of 16-bit words if needed to convert from
3526 * little-endian byte order to native cpu byte order, or
3530 * Inherited from caller.
3532 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3537 for (i
= 0; i
< buf_words
; i
++)
3538 buf
[i
] = le16_to_cpu(buf
[i
]);
3539 #endif /* __BIG_ENDIAN */
3543 * ata_mmio_data_xfer - Transfer data by MMIO
3544 * @ap: port to read/write
3546 * @buflen: buffer length
3547 * @write_data: read/write
3549 * Transfer data from/to the device data register by MMIO.
3552 * Inherited from caller.
3555 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3556 unsigned int buflen
, int write_data
)
3559 unsigned int words
= buflen
>> 1;
3560 u16
*buf16
= (u16
*) buf
;
3561 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3563 /* Transfer multiple of 2 bytes */
3565 for (i
= 0; i
< words
; i
++)
3566 writew(le16_to_cpu(buf16
[i
]), mmio
);
3568 for (i
= 0; i
< words
; i
++)
3569 buf16
[i
] = cpu_to_le16(readw(mmio
));
3572 /* Transfer trailing 1 byte, if any. */
3573 if (unlikely(buflen
& 0x01)) {
3574 u16 align_buf
[1] = { 0 };
3575 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3578 memcpy(align_buf
, trailing_buf
, 1);
3579 writew(le16_to_cpu(align_buf
[0]), mmio
);
3581 align_buf
[0] = cpu_to_le16(readw(mmio
));
3582 memcpy(trailing_buf
, align_buf
, 1);
3588 * ata_pio_data_xfer - Transfer data by PIO
3589 * @ap: port to read/write
3591 * @buflen: buffer length
3592 * @write_data: read/write
3594 * Transfer data from/to the device data register by PIO.
3597 * Inherited from caller.
3600 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3601 unsigned int buflen
, int write_data
)
3603 unsigned int words
= buflen
>> 1;
3605 /* Transfer multiple of 2 bytes */
3607 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3609 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3611 /* Transfer trailing 1 byte, if any. */
3612 if (unlikely(buflen
& 0x01)) {
3613 u16 align_buf
[1] = { 0 };
3614 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3617 memcpy(align_buf
, trailing_buf
, 1);
3618 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3620 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3621 memcpy(trailing_buf
, align_buf
, 1);
3627 * ata_data_xfer - Transfer data from/to the data register.
3628 * @ap: port to read/write
3630 * @buflen: buffer length
3631 * @do_write: read/write
3633 * Transfer data from/to the device data register.
3636 * Inherited from caller.
3639 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3640 unsigned int buflen
, int do_write
)
3642 /* Make the crap hardware pay the costs not the good stuff */
3643 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3644 unsigned long flags
;
3645 local_irq_save(flags
);
3646 if (ap
->flags
& ATA_FLAG_MMIO
)
3647 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3649 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3650 local_irq_restore(flags
);
3652 if (ap
->flags
& ATA_FLAG_MMIO
)
3653 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3655 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3660 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3661 * @qc: Command on going
3663 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3666 * Inherited from caller.
3669 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3671 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3672 struct scatterlist
*sg
= qc
->__sg
;
3673 struct ata_port
*ap
= qc
->ap
;
3675 unsigned int offset
;
3678 if (qc
->cursect
== (qc
->nsect
- 1))
3679 ap
->hsm_task_state
= HSM_ST_LAST
;
3681 page
= sg
[qc
->cursg
].page
;
3682 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3684 /* get the current page and offset */
3685 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3686 offset
%= PAGE_SIZE
;
3688 buf
= kmap(page
) + offset
;
3693 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3698 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3700 /* do the actual data transfer */
3701 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3702 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3708 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3709 * @qc: Command on going
3710 * @bytes: number of bytes
3712 * Transfer Transfer data from/to the ATAPI device.
3715 * Inherited from caller.
3719 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3721 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3722 struct scatterlist
*sg
= qc
->__sg
;
3723 struct ata_port
*ap
= qc
->ap
;
3726 unsigned int offset
, count
;
3728 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3729 ap
->hsm_task_state
= HSM_ST_LAST
;
3732 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3734 * The end of qc->sg is reached and the device expects
3735 * more data to transfer. In order not to overrun qc->sg
3736 * and fulfill length specified in the byte count register,
3737 * - for read case, discard trailing data from the device
3738 * - for write case, padding zero data to the device
3740 u16 pad_buf
[1] = { 0 };
3741 unsigned int words
= bytes
>> 1;
3744 if (words
) /* warning if bytes > 1 */
3745 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3748 for (i
= 0; i
< words
; i
++)
3749 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3751 ap
->hsm_task_state
= HSM_ST_LAST
;
3755 sg
= &qc
->__sg
[qc
->cursg
];
3758 offset
= sg
->offset
+ qc
->cursg_ofs
;
3760 /* get the current page and offset */
3761 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3762 offset
%= PAGE_SIZE
;
3764 /* don't overrun current sg */
3765 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3767 /* don't cross page boundaries */
3768 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3770 buf
= kmap(page
) + offset
;
3773 qc
->curbytes
+= count
;
3774 qc
->cursg_ofs
+= count
;
3776 if (qc
->cursg_ofs
== sg
->length
) {
3781 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3783 /* do the actual data transfer */
3784 ata_data_xfer(ap
, buf
, count
, do_write
);
3793 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3794 * @qc: Command on going
3796 * Transfer Transfer data from/to the ATAPI device.
3799 * Inherited from caller.
3802 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3804 struct ata_port
*ap
= qc
->ap
;
3805 struct ata_device
*dev
= qc
->dev
;
3806 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3807 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3809 ap
->ops
->tf_read(ap
, &qc
->tf
);
3810 ireason
= qc
->tf
.nsect
;
3811 bc_lo
= qc
->tf
.lbam
;
3812 bc_hi
= qc
->tf
.lbah
;
3813 bytes
= (bc_hi
<< 8) | bc_lo
;
3815 /* shall be cleared to zero, indicating xfer of data */
3816 if (ireason
& (1 << 0))
3819 /* make sure transfer direction matches expected */
3820 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3821 if (do_write
!= i_write
)
3824 __atapi_pio_bytes(qc
, bytes
);
3829 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3830 ap
->id
, dev
->devno
);
3831 qc
->err_mask
|= AC_ERR_HSM
;
3832 ap
->hsm_task_state
= HSM_ST_ERR
;
3836 * ata_pio_block - start PIO on a block
3837 * @qc: qc to transfer block for
3840 * None. (executing in kernel thread context)
3842 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3844 struct ata_port
*ap
= qc
->ap
;
3848 * This is purely heuristic. This is a fast path.
3849 * Sometimes when we enter, BSY will be cleared in
3850 * a chk-status or two. If not, the drive is probably seeking
3851 * or something. Snooze for a couple msecs, then
3852 * chk-status again. If still busy, fall back to
3853 * HSM_ST_POLL state.
3855 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3856 if (status
& ATA_BUSY
) {
3858 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3859 if (status
& ATA_BUSY
) {
3860 ap
->hsm_task_state
= HSM_ST_POLL
;
3861 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3867 if (status
& (ATA_ERR
| ATA_DF
)) {
3868 qc
->err_mask
|= AC_ERR_DEV
;
3869 ap
->hsm_task_state
= HSM_ST_ERR
;
3873 /* transfer data if any */
3874 if (is_atapi_taskfile(&qc
->tf
)) {
3875 /* DRQ=0 means no more data to transfer */
3876 if ((status
& ATA_DRQ
) == 0) {
3877 ap
->hsm_task_state
= HSM_ST_LAST
;
3881 atapi_pio_bytes(qc
);
3883 /* handle BSY=0, DRQ=0 as error */
3884 if ((status
& ATA_DRQ
) == 0) {
3885 qc
->err_mask
|= AC_ERR_HSM
;
3886 ap
->hsm_task_state
= HSM_ST_ERR
;
3894 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3896 struct ata_port
*ap
= qc
->ap
;
3898 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3899 printk(KERN_WARNING
"ata%u: dev %u PIO error\n",
3900 ap
->id
, qc
->dev
->devno
);
3902 /* make sure qc->err_mask is available to
3903 * know what's wrong and recover
3905 WARN_ON(qc
->err_mask
== 0);
3907 ap
->hsm_task_state
= HSM_ST_IDLE
;
3909 ata_poll_qc_complete(qc
);
3912 static void ata_pio_task(void *_data
)
3914 struct ata_queued_cmd
*qc
= _data
;
3915 struct ata_port
*ap
= qc
->ap
;
3916 unsigned long timeout
;
3923 switch (ap
->hsm_task_state
) {
3932 qc_completed
= ata_pio_complete(qc
);
3936 case HSM_ST_LAST_POLL
:
3937 timeout
= ata_pio_poll(qc
);
3947 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3948 else if (!qc_completed
)
3953 * atapi_packet_task - Write CDB bytes to hardware
3954 * @_data: qc in progress
3956 * When device has indicated its readiness to accept
3957 * a CDB, this function is called. Send the CDB.
3958 * If DMA is to be performed, exit immediately.
3959 * Otherwise, we are in polling mode, so poll
3960 * status under operation succeeds or fails.
3963 * Kernel thread context (may sleep)
3965 static void atapi_packet_task(void *_data
)
3967 struct ata_queued_cmd
*qc
= _data
;
3968 struct ata_port
*ap
= qc
->ap
;
3971 /* sleep-wait for BSY to clear */
3972 DPRINTK("busy wait\n");
3973 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3974 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3978 /* make sure DRQ is set */
3979 status
= ata_chk_status(ap
);
3980 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3981 qc
->err_mask
|= AC_ERR_HSM
;
3986 DPRINTK("send cdb\n");
3987 WARN_ON(qc
->dev
->cdb_len
< 12);
3989 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3990 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3991 unsigned long flags
;
3993 /* Once we're done issuing command and kicking bmdma,
3994 * irq handler takes over. To not lose irq, we need
3995 * to clear NOINTR flag before sending cdb, but
3996 * interrupt handler shouldn't be invoked before we're
3997 * finished. Hence, the following locking.
3999 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4000 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4001 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4002 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4003 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4004 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4006 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4008 /* PIO commands are handled by polling */
4009 ap
->hsm_task_state
= HSM_ST
;
4010 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4016 ata_poll_qc_complete(qc
);
4020 * ata_qc_new - Request an available ATA command, for queueing
4021 * @ap: Port associated with device @dev
4022 * @dev: Device from whom we request an available command structure
4028 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4030 struct ata_queued_cmd
*qc
= NULL
;
4033 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4034 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4035 qc
= ata_qc_from_tag(ap
, i
);
4046 * ata_qc_new_init - Request an available ATA command, and initialize it
4047 * @ap: Port associated with device @dev
4048 * @dev: Device from whom we request an available command structure
4054 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4055 struct ata_device
*dev
)
4057 struct ata_queued_cmd
*qc
;
4059 qc
= ata_qc_new(ap
);
4072 * ata_qc_free - free unused ata_queued_cmd
4073 * @qc: Command to complete
4075 * Designed to free unused ata_queued_cmd object
4076 * in case something prevents using it.
4079 * spin_lock_irqsave(host_set lock)
4081 void ata_qc_free(struct ata_queued_cmd
*qc
)
4083 struct ata_port
*ap
= qc
->ap
;
4086 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4090 if (likely(ata_tag_valid(tag
))) {
4091 qc
->tag
= ATA_TAG_POISON
;
4092 clear_bit(tag
, &ap
->qactive
);
4096 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4098 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4099 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4101 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4104 /* command should be marked inactive atomically with qc completion */
4105 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4107 /* atapi: mark qc as inactive to prevent the interrupt handler
4108 * from completing the command twice later, before the error handler
4109 * is called. (when rc != 0 and atapi request sense is needed)
4111 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4113 /* call completion callback */
4114 qc
->complete_fn(qc
);
4117 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4119 struct ata_port
*ap
= qc
->ap
;
4121 switch (qc
->tf
.protocol
) {
4123 case ATA_PROT_ATAPI_DMA
:
4126 case ATA_PROT_ATAPI
:
4128 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4141 * ata_qc_issue - issue taskfile to device
4142 * @qc: command to issue to device
4144 * Prepare an ATA command to submission to device.
4145 * This includes mapping the data into a DMA-able
4146 * area, filling in the S/G table, and finally
4147 * writing the taskfile to hardware, starting the command.
4150 * spin_lock_irqsave(host_set lock)
4152 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4154 struct ata_port
*ap
= qc
->ap
;
4156 qc
->ap
->active_tag
= qc
->tag
;
4157 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4159 if (ata_should_dma_map(qc
)) {
4160 if (qc
->flags
& ATA_QCFLAG_SG
) {
4161 if (ata_sg_setup(qc
))
4163 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4164 if (ata_sg_setup_one(qc
))
4168 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4171 ap
->ops
->qc_prep(qc
);
4173 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4174 if (unlikely(qc
->err_mask
))
4179 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4180 qc
->err_mask
|= AC_ERR_SYSTEM
;
4182 ata_qc_complete(qc
);
4186 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4187 * @qc: command to issue to device
4189 * Using various libata functions and hooks, this function
4190 * starts an ATA command. ATA commands are grouped into
4191 * classes called "protocols", and issuing each type of protocol
4192 * is slightly different.
4194 * May be used as the qc_issue() entry in ata_port_operations.
4197 * spin_lock_irqsave(host_set lock)
4200 * Zero on success, AC_ERR_* mask on failure
4203 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4205 struct ata_port
*ap
= qc
->ap
;
4207 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4209 switch (qc
->tf
.protocol
) {
4210 case ATA_PROT_NODATA
:
4211 ata_tf_to_host(ap
, &qc
->tf
);
4215 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4216 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4217 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4220 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4221 ata_qc_set_polling(qc
);
4222 ata_tf_to_host(ap
, &qc
->tf
);
4223 ap
->hsm_task_state
= HSM_ST
;
4224 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4227 case ATA_PROT_ATAPI
:
4228 ata_qc_set_polling(qc
);
4229 ata_tf_to_host(ap
, &qc
->tf
);
4230 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4233 case ATA_PROT_ATAPI_NODATA
:
4234 ap
->flags
|= ATA_FLAG_NOINTR
;
4235 ata_tf_to_host(ap
, &qc
->tf
);
4236 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4239 case ATA_PROT_ATAPI_DMA
:
4240 ap
->flags
|= ATA_FLAG_NOINTR
;
4241 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4242 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4243 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4248 return AC_ERR_SYSTEM
;
4255 * ata_host_intr - Handle host interrupt for given (port, task)
4256 * @ap: Port on which interrupt arrived (possibly...)
4257 * @qc: Taskfile currently active in engine
4259 * Handle host interrupt for given queued command. Currently,
4260 * only DMA interrupts are handled. All other commands are
4261 * handled via polling with interrupts disabled (nIEN bit).
4264 * spin_lock_irqsave(host_set lock)
4267 * One if interrupt was handled, zero if not (shared irq).
4270 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4271 struct ata_queued_cmd
*qc
)
4273 u8 status
, host_stat
;
4275 switch (qc
->tf
.protocol
) {
4278 case ATA_PROT_ATAPI_DMA
:
4279 case ATA_PROT_ATAPI
:
4280 /* check status of DMA engine */
4281 host_stat
= ap
->ops
->bmdma_status(ap
);
4282 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4284 /* if it's not our irq... */
4285 if (!(host_stat
& ATA_DMA_INTR
))
4288 /* before we do anything else, clear DMA-Start bit */
4289 ap
->ops
->bmdma_stop(qc
);
4293 case ATA_PROT_ATAPI_NODATA
:
4294 case ATA_PROT_NODATA
:
4295 /* check altstatus */
4296 status
= ata_altstatus(ap
);
4297 if (status
& ATA_BUSY
)
4300 /* check main status, clearing INTRQ */
4301 status
= ata_chk_status(ap
);
4302 if (unlikely(status
& ATA_BUSY
))
4304 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4305 ap
->id
, qc
->tf
.protocol
, status
);
4307 /* ack bmdma irq events */
4308 ap
->ops
->irq_clear(ap
);
4310 /* complete taskfile transaction */
4311 qc
->err_mask
|= ac_err_mask(status
);
4312 ata_qc_complete(qc
);
4319 return 1; /* irq handled */
4322 ap
->stats
.idle_irq
++;
4325 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4326 ata_irq_ack(ap
, 0); /* debug trap */
4327 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4331 return 0; /* irq not handled */
4335 * ata_interrupt - Default ATA host interrupt handler
4336 * @irq: irq line (unused)
4337 * @dev_instance: pointer to our ata_host_set information structure
4340 * Default interrupt handler for PCI IDE devices. Calls
4341 * ata_host_intr() for each port that is not disabled.
4344 * Obtains host_set lock during operation.
4347 * IRQ_NONE or IRQ_HANDLED.
4350 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4352 struct ata_host_set
*host_set
= dev_instance
;
4354 unsigned int handled
= 0;
4355 unsigned long flags
;
4357 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4358 spin_lock_irqsave(&host_set
->lock
, flags
);
4360 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4361 struct ata_port
*ap
;
4363 ap
= host_set
->ports
[i
];
4365 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4366 struct ata_queued_cmd
*qc
;
4368 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4369 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4370 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4371 handled
|= ata_host_intr(ap
, qc
);
4375 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4377 return IRQ_RETVAL(handled
);
4382 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4383 * without filling any other registers
4385 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4388 struct ata_taskfile tf
;
4391 ata_tf_init(ap
, &tf
, dev
->devno
);
4394 tf
.flags
|= ATA_TFLAG_DEVICE
;
4395 tf
.protocol
= ATA_PROT_NODATA
;
4397 err
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4399 printk(KERN_ERR
"%s: ata command failed: %d\n",
4405 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4409 if (!ata_try_flush_cache(dev
))
4412 if (ata_id_has_flush_ext(dev
->id
))
4413 cmd
= ATA_CMD_FLUSH_EXT
;
4415 cmd
= ATA_CMD_FLUSH
;
4417 return ata_do_simple_cmd(ap
, dev
, cmd
);
4420 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4422 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4425 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4427 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4431 * ata_device_resume - wakeup a previously suspended devices
4432 * @ap: port the device is connected to
4433 * @dev: the device to resume
4435 * Kick the drive back into action, by sending it an idle immediate
4436 * command and making sure its transfer mode matches between drive
4440 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4442 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4443 struct ata_device
*failed_dev
;
4444 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4445 while (ata_set_mode(ap
, &failed_dev
))
4446 ata_dev_disable(ap
, failed_dev
);
4448 if (!ata_dev_enabled(dev
))
4450 if (dev
->class == ATA_DEV_ATA
)
4451 ata_start_drive(ap
, dev
);
4457 * ata_device_suspend - prepare a device for suspend
4458 * @ap: port the device is connected to
4459 * @dev: the device to suspend
4461 * Flush the cache on the drive, if appropriate, then issue a
4462 * standbynow command.
4464 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4466 if (!ata_dev_enabled(dev
))
4468 if (dev
->class == ATA_DEV_ATA
)
4469 ata_flush_cache(ap
, dev
);
4471 if (state
.event
!= PM_EVENT_FREEZE
)
4472 ata_standby_drive(ap
, dev
);
4473 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4478 * ata_port_start - Set port up for dma.
4479 * @ap: Port to initialize
4481 * Called just after data structures for each port are
4482 * initialized. Allocates space for PRD table.
4484 * May be used as the port_start() entry in ata_port_operations.
4487 * Inherited from caller.
4490 int ata_port_start (struct ata_port
*ap
)
4492 struct device
*dev
= ap
->dev
;
4495 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4499 rc
= ata_pad_alloc(ap
, dev
);
4501 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4505 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4512 * ata_port_stop - Undo ata_port_start()
4513 * @ap: Port to shut down
4515 * Frees the PRD table.
4517 * May be used as the port_stop() entry in ata_port_operations.
4520 * Inherited from caller.
4523 void ata_port_stop (struct ata_port
*ap
)
4525 struct device
*dev
= ap
->dev
;
4527 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4528 ata_pad_free(ap
, dev
);
4531 void ata_host_stop (struct ata_host_set
*host_set
)
4533 if (host_set
->mmio_base
)
4534 iounmap(host_set
->mmio_base
);
4539 * ata_host_remove - Unregister SCSI host structure with upper layers
4540 * @ap: Port to unregister
4541 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4544 * Inherited from caller.
4547 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4549 struct Scsi_Host
*sh
= ap
->host
;
4554 scsi_remove_host(sh
);
4556 ap
->ops
->port_stop(ap
);
4560 * ata_host_init - Initialize an ata_port structure
4561 * @ap: Structure to initialize
4562 * @host: associated SCSI mid-layer structure
4563 * @host_set: Collection of hosts to which @ap belongs
4564 * @ent: Probe information provided by low-level driver
4565 * @port_no: Port number associated with this ata_port
4567 * Initialize a new ata_port structure, and its associated
4571 * Inherited from caller.
4574 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4575 struct ata_host_set
*host_set
,
4576 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4582 host
->max_channel
= 1;
4583 host
->unique_id
= ata_unique_id
++;
4584 host
->max_cmd_len
= 12;
4586 ap
->flags
= ATA_FLAG_DISABLED
;
4587 ap
->id
= host
->unique_id
;
4589 ap
->ctl
= ATA_DEVCTL_OBS
;
4590 ap
->host_set
= host_set
;
4592 ap
->port_no
= port_no
;
4594 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4595 ap
->pio_mask
= ent
->pio_mask
;
4596 ap
->mwdma_mask
= ent
->mwdma_mask
;
4597 ap
->udma_mask
= ent
->udma_mask
;
4598 ap
->flags
|= ent
->host_flags
;
4599 ap
->ops
= ent
->port_ops
;
4600 ap
->cbl
= ATA_CBL_NONE
;
4601 ap
->sata_spd_limit
= UINT_MAX
;
4602 ap
->active_tag
= ATA_TAG_POISON
;
4603 ap
->last_ctl
= 0xFF;
4605 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4606 INIT_LIST_HEAD(&ap
->eh_done_q
);
4608 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4609 struct ata_device
*dev
= &ap
->device
[i
];
4611 dev
->pio_mask
= UINT_MAX
;
4612 dev
->mwdma_mask
= UINT_MAX
;
4613 dev
->udma_mask
= UINT_MAX
;
4617 ap
->stats
.unhandled_irq
= 1;
4618 ap
->stats
.idle_irq
= 1;
4621 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4625 * ata_host_add - Attach low-level ATA driver to system
4626 * @ent: Information provided by low-level driver
4627 * @host_set: Collections of ports to which we add
4628 * @port_no: Port number associated with this host
4630 * Attach low-level ATA driver to system.
4633 * PCI/etc. bus probe sem.
4636 * New ata_port on success, for NULL on error.
4639 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4640 struct ata_host_set
*host_set
,
4641 unsigned int port_no
)
4643 struct Scsi_Host
*host
;
4644 struct ata_port
*ap
;
4649 if (!ent
->port_ops
->probe_reset
&&
4650 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4651 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4656 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4660 host
->transportt
= &ata_scsi_transport_template
;
4662 ap
= ata_shost_to_port(host
);
4664 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4666 rc
= ap
->ops
->port_start(ap
);
4673 scsi_host_put(host
);
4678 * ata_device_add - Register hardware device with ATA and SCSI layers
4679 * @ent: Probe information describing hardware device to be registered
4681 * This function processes the information provided in the probe
4682 * information struct @ent, allocates the necessary ATA and SCSI
4683 * host information structures, initializes them, and registers
4684 * everything with requisite kernel subsystems.
4686 * This function requests irqs, probes the ATA bus, and probes
4690 * PCI/etc. bus probe sem.
4693 * Number of ports registered. Zero on error (no ports registered).
4696 int ata_device_add(const struct ata_probe_ent
*ent
)
4698 unsigned int count
= 0, i
;
4699 struct device
*dev
= ent
->dev
;
4700 struct ata_host_set
*host_set
;
4703 /* alloc a container for our list of ATA ports (buses) */
4704 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4705 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4708 spin_lock_init(&host_set
->lock
);
4710 host_set
->dev
= dev
;
4711 host_set
->n_ports
= ent
->n_ports
;
4712 host_set
->irq
= ent
->irq
;
4713 host_set
->mmio_base
= ent
->mmio_base
;
4714 host_set
->private_data
= ent
->private_data
;
4715 host_set
->ops
= ent
->port_ops
;
4716 host_set
->flags
= ent
->host_set_flags
;
4718 /* register each port bound to this device */
4719 for (i
= 0; i
< ent
->n_ports
; i
++) {
4720 struct ata_port
*ap
;
4721 unsigned long xfer_mode_mask
;
4723 ap
= ata_host_add(ent
, host_set
, i
);
4727 host_set
->ports
[i
] = ap
;
4728 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4729 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4730 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4732 /* print per-port info to dmesg */
4733 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4734 "bmdma 0x%lX irq %lu\n",
4736 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4737 ata_mode_string(xfer_mode_mask
),
4738 ap
->ioaddr
.cmd_addr
,
4739 ap
->ioaddr
.ctl_addr
,
4740 ap
->ioaddr
.bmdma_addr
,
4744 host_set
->ops
->irq_clear(ap
);
4751 /* obtain irq, that is shared between channels */
4752 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4753 DRV_NAME
, host_set
))
4756 /* perform each probe synchronously */
4757 DPRINTK("probe begin\n");
4758 for (i
= 0; i
< count
; i
++) {
4759 struct ata_port
*ap
;
4762 ap
= host_set
->ports
[i
];
4764 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4765 rc
= ata_bus_probe(ap
);
4766 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4769 /* FIXME: do something useful here?
4770 * Current libata behavior will
4771 * tear down everything when
4772 * the module is removed
4773 * or the h/w is unplugged.
4777 rc
= scsi_add_host(ap
->host
, dev
);
4779 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4781 /* FIXME: do something useful here */
4782 /* FIXME: handle unconditional calls to
4783 * scsi_scan_host and ata_host_remove, below,
4789 /* probes are done, now scan each port's disk(s) */
4790 DPRINTK("host probe begin\n");
4791 for (i
= 0; i
< count
; i
++) {
4792 struct ata_port
*ap
= host_set
->ports
[i
];
4794 ata_scsi_scan_host(ap
);
4797 dev_set_drvdata(dev
, host_set
);
4799 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4800 return ent
->n_ports
; /* success */
4803 for (i
= 0; i
< count
; i
++) {
4804 ata_host_remove(host_set
->ports
[i
], 1);
4805 scsi_host_put(host_set
->ports
[i
]->host
);
4809 VPRINTK("EXIT, returning 0\n");
4814 * ata_host_set_remove - PCI layer callback for device removal
4815 * @host_set: ATA host set that was removed
4817 * Unregister all objects associated with this host set. Free those
4821 * Inherited from calling layer (may sleep).
4824 void ata_host_set_remove(struct ata_host_set
*host_set
)
4826 struct ata_port
*ap
;
4829 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4830 ap
= host_set
->ports
[i
];
4831 scsi_remove_host(ap
->host
);
4834 free_irq(host_set
->irq
, host_set
);
4836 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4837 ap
= host_set
->ports
[i
];
4839 ata_scsi_release(ap
->host
);
4841 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4842 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4844 if (ioaddr
->cmd_addr
== 0x1f0)
4845 release_region(0x1f0, 8);
4846 else if (ioaddr
->cmd_addr
== 0x170)
4847 release_region(0x170, 8);
4850 scsi_host_put(ap
->host
);
4853 if (host_set
->ops
->host_stop
)
4854 host_set
->ops
->host_stop(host_set
);
4860 * ata_scsi_release - SCSI layer callback hook for host unload
4861 * @host: libata host to be unloaded
4863 * Performs all duties necessary to shut down a libata port...
4864 * Kill port kthread, disable port, and release resources.
4867 * Inherited from SCSI layer.
4873 int ata_scsi_release(struct Scsi_Host
*host
)
4875 struct ata_port
*ap
= ata_shost_to_port(host
);
4880 ap
->ops
->port_disable(ap
);
4881 ata_host_remove(ap
, 0);
4882 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4883 kfree(ap
->device
[i
].id
);
4890 * ata_std_ports - initialize ioaddr with standard port offsets.
4891 * @ioaddr: IO address structure to be initialized
4893 * Utility function which initializes data_addr, error_addr,
4894 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4895 * device_addr, status_addr, and command_addr to standard offsets
4896 * relative to cmd_addr.
4898 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4901 void ata_std_ports(struct ata_ioports
*ioaddr
)
4903 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4904 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4905 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4906 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4907 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4908 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4909 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4910 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4911 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4912 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4918 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4920 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4922 pci_iounmap(pdev
, host_set
->mmio_base
);
4926 * ata_pci_remove_one - PCI layer callback for device removal
4927 * @pdev: PCI device that was removed
4929 * PCI layer indicates to libata via this hook that
4930 * hot-unplug or module unload event has occurred.
4931 * Handle this by unregistering all objects associated
4932 * with this PCI device. Free those objects. Then finally
4933 * release PCI resources and disable device.
4936 * Inherited from PCI layer (may sleep).
4939 void ata_pci_remove_one (struct pci_dev
*pdev
)
4941 struct device
*dev
= pci_dev_to_dev(pdev
);
4942 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4944 ata_host_set_remove(host_set
);
4945 pci_release_regions(pdev
);
4946 pci_disable_device(pdev
);
4947 dev_set_drvdata(dev
, NULL
);
4950 /* move to PCI subsystem */
4951 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4953 unsigned long tmp
= 0;
4955 switch (bits
->width
) {
4958 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4964 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4970 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4981 return (tmp
== bits
->val
) ? 1 : 0;
4984 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4986 pci_save_state(pdev
);
4987 pci_disable_device(pdev
);
4988 pci_set_power_state(pdev
, PCI_D3hot
);
4992 int ata_pci_device_resume(struct pci_dev
*pdev
)
4994 pci_set_power_state(pdev
, PCI_D0
);
4995 pci_restore_state(pdev
);
4996 pci_enable_device(pdev
);
4997 pci_set_master(pdev
);
5000 #endif /* CONFIG_PCI */
5003 static int __init
ata_init(void)
5005 ata_wq
= create_workqueue("ata");
5009 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5013 static void __exit
ata_exit(void)
5015 destroy_workqueue(ata_wq
);
5018 module_init(ata_init
);
5019 module_exit(ata_exit
);
5021 static unsigned long ratelimit_time
;
5022 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5024 int ata_ratelimit(void)
5027 unsigned long flags
;
5029 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5031 if (time_after(jiffies
, ratelimit_time
)) {
5033 ratelimit_time
= jiffies
+ (HZ
/5);
5037 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5043 * ata_wait_register - wait until register value changes
5044 * @reg: IO-mapped register
5045 * @mask: Mask to apply to read register value
5046 * @val: Wait condition
5047 * @interval_msec: polling interval in milliseconds
5048 * @timeout_msec: timeout in milliseconds
5050 * Waiting for some bits of register to change is a common
5051 * operation for ATA controllers. This function reads 32bit LE
5052 * IO-mapped register @reg and tests for the following condition.
5054 * (*@reg & mask) != val
5056 * If the condition is met, it returns; otherwise, the process is
5057 * repeated after @interval_msec until timeout.
5060 * Kernel thread context (may sleep)
5063 * The final register value.
5065 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5066 unsigned long interval_msec
,
5067 unsigned long timeout_msec
)
5069 unsigned long timeout
;
5072 tmp
= ioread32(reg
);
5074 /* Calculate timeout _after_ the first read to make sure
5075 * preceding writes reach the controller before starting to
5076 * eat away the timeout.
5078 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5080 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5081 msleep(interval_msec
);
5082 tmp
= ioread32(reg
);
5089 * libata is essentially a library of internal helper functions for
5090 * low-level ATA host controller drivers. As such, the API/ABI is
5091 * likely to change as new drivers are added and updated.
5092 * Do not depend on ABI/API stability.
5095 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5096 EXPORT_SYMBOL_GPL(ata_std_ports
);
5097 EXPORT_SYMBOL_GPL(ata_device_add
);
5098 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5099 EXPORT_SYMBOL_GPL(ata_sg_init
);
5100 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5101 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5102 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5103 EXPORT_SYMBOL_GPL(ata_tf_load
);
5104 EXPORT_SYMBOL_GPL(ata_tf_read
);
5105 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5106 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5107 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5108 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5109 EXPORT_SYMBOL_GPL(ata_check_status
);
5110 EXPORT_SYMBOL_GPL(ata_altstatus
);
5111 EXPORT_SYMBOL_GPL(ata_exec_command
);
5112 EXPORT_SYMBOL_GPL(ata_port_start
);
5113 EXPORT_SYMBOL_GPL(ata_port_stop
);
5114 EXPORT_SYMBOL_GPL(ata_host_stop
);
5115 EXPORT_SYMBOL_GPL(ata_interrupt
);
5116 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5117 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5118 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5119 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5120 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5121 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5122 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5123 EXPORT_SYMBOL_GPL(ata_port_probe
);
5124 EXPORT_SYMBOL_GPL(sata_set_spd
);
5125 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5126 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5127 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5128 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5129 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5130 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5131 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5132 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5133 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5134 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5135 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5136 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5137 EXPORT_SYMBOL_GPL(ata_port_disable
);
5138 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5139 EXPORT_SYMBOL_GPL(ata_wait_register
);
5140 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5141 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5142 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5143 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5144 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5145 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5146 EXPORT_SYMBOL_GPL(ata_host_intr
);
5147 EXPORT_SYMBOL_GPL(ata_id_string
);
5148 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5149 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5151 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5152 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5153 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5156 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5157 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5158 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5159 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5160 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5161 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5162 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5163 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5164 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5165 #endif /* CONFIG_PCI */
5167 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5168 EXPORT_SYMBOL_GPL(ata_device_resume
);
5169 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5170 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5172 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5173 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5174 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);