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
;
962 * ata_exec_internal - execute libata internal command
963 * @ap: Port to which the command is sent
964 * @dev: Device to which the command is sent
965 * @tf: Taskfile registers for the command and the result
966 * @cdb: CDB for packet command
967 * @dma_dir: Data tranfer direction of the command
968 * @buf: Data buffer of the command
969 * @buflen: Length of data buffer
971 * Executes libata internal command with timeout. @tf contains
972 * command on entry and result on return. Timeout and error
973 * conditions are reported via return value. No recovery action
974 * is taken after a command times out. It's caller's duty to
975 * clean up after timeout.
978 * None. Should be called with kernel context, might sleep.
981 unsigned ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
982 struct ata_taskfile
*tf
, const u8
*cdb
,
983 int dma_dir
, void *buf
, unsigned int buflen
)
985 u8 command
= tf
->command
;
986 struct ata_queued_cmd
*qc
;
987 DECLARE_COMPLETION(wait
);
989 unsigned int err_mask
;
991 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
993 qc
= ata_qc_new_init(ap
, dev
);
998 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
999 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
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
);
1037 *tf
= qc
->result_tf
;
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 * @id: buffer to read IDENTIFY data into
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
*id
)
1118 unsigned int class = *p_class
;
1119 struct ata_taskfile tf
;
1120 unsigned int err_mask
= 0;
1124 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1126 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1129 ata_tf_init(ap
, &tf
, dev
->devno
);
1133 tf
.command
= ATA_CMD_ID_ATA
;
1136 tf
.command
= ATA_CMD_ID_ATAPI
;
1140 reason
= "unsupported class";
1144 tf
.protocol
= ATA_PROT_PIO
;
1146 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1147 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1150 reason
= "I/O error";
1154 swap_buf_le16(id
, ATA_ID_WORDS
);
1157 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1159 reason
= "device reports illegal type";
1163 if (post_reset
&& class == ATA_DEV_ATA
) {
1165 * The exact sequence expected by certain pre-ATA4 drives is:
1168 * INITIALIZE DEVICE PARAMETERS
1170 * Some drives were very specific about that exact sequence.
1172 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1173 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1176 reason
= "INIT_DEV_PARAMS failed";
1180 /* current CHS translation info (id[53-58]) might be
1181 * changed. reread the identify device info.
1193 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1194 ap
->id
, dev
->devno
, reason
);
1198 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1199 struct ata_device
*dev
)
1201 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1205 * ata_dev_configure - Configure the specified ATA/ATAPI device
1206 * @ap: Port on which target device resides
1207 * @dev: Target device to configure
1208 * @print_info: Enable device info printout
1210 * Configure @dev according to @dev->id. Generic and low-level
1211 * driver specific fixups are also applied.
1214 * Kernel thread context (may sleep)
1217 * 0 on success, -errno otherwise
1219 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1222 const u16
*id
= dev
->id
;
1223 unsigned int xfer_mask
;
1226 if (!ata_dev_enabled(dev
)) {
1227 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1228 ap
->id
, dev
->devno
);
1232 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1234 /* print device capabilities */
1236 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1237 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1238 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1239 id
[84], id
[85], id
[86], id
[87], id
[88]);
1241 /* initialize to-be-configured parameters */
1242 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1243 dev
->max_sectors
= 0;
1251 * common ATA, ATAPI feature tests
1254 /* find max transfer mode; for printk only */
1255 xfer_mask
= ata_id_xfermask(id
);
1259 /* ATA-specific feature tests */
1260 if (dev
->class == ATA_DEV_ATA
) {
1261 dev
->n_sectors
= ata_id_n_sectors(id
);
1263 if (ata_id_has_lba(id
)) {
1264 const char *lba_desc
;
1267 dev
->flags
|= ATA_DFLAG_LBA
;
1268 if (ata_id_has_lba48(id
)) {
1269 dev
->flags
|= ATA_DFLAG_LBA48
;
1273 /* print device info to dmesg */
1275 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1276 "max %s, %Lu sectors: %s\n",
1278 ata_id_major_version(id
),
1279 ata_mode_string(xfer_mask
),
1280 (unsigned long long)dev
->n_sectors
,
1285 /* Default translation */
1286 dev
->cylinders
= id
[1];
1288 dev
->sectors
= id
[6];
1290 if (ata_id_current_chs_valid(id
)) {
1291 /* Current CHS translation is valid. */
1292 dev
->cylinders
= id
[54];
1293 dev
->heads
= id
[55];
1294 dev
->sectors
= id
[56];
1297 /* print device info to dmesg */
1299 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1300 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1302 ata_id_major_version(id
),
1303 ata_mode_string(xfer_mask
),
1304 (unsigned long long)dev
->n_sectors
,
1305 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1311 /* ATAPI-specific feature tests */
1312 else if (dev
->class == ATA_DEV_ATAPI
) {
1313 rc
= atapi_cdb_len(id
);
1314 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1315 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1319 dev
->cdb_len
= (unsigned int) rc
;
1321 /* print device info to dmesg */
1323 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1324 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1327 ap
->host
->max_cmd_len
= 0;
1328 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1329 ap
->host
->max_cmd_len
= max_t(unsigned int,
1330 ap
->host
->max_cmd_len
,
1331 ap
->device
[i
].cdb_len
);
1333 /* limit bridge transfers to udma5, 200 sectors */
1334 if (ata_dev_knobble(ap
, dev
)) {
1336 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1337 ap
->id
, dev
->devno
);
1338 dev
->udma_mask
&= ATA_UDMA5
;
1339 dev
->max_sectors
= ATA_MAX_SECTORS
;
1342 if (ap
->ops
->dev_config
)
1343 ap
->ops
->dev_config(ap
, dev
);
1345 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1349 DPRINTK("EXIT, err\n");
1354 * ata_bus_probe - Reset and probe ATA bus
1357 * Master ATA bus probing function. Initiates a hardware-dependent
1358 * bus reset, then attempts to identify any devices found on
1362 * PCI/etc. bus probe sem.
1365 * Zero on success, negative errno otherwise.
1368 static int ata_bus_probe(struct ata_port
*ap
)
1370 unsigned int classes
[ATA_MAX_DEVICES
];
1371 int tries
[ATA_MAX_DEVICES
];
1372 int i
, rc
, down_xfermask
;
1373 struct ata_device
*dev
;
1377 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1378 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1383 /* reset and determine device classes */
1384 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1385 classes
[i
] = ATA_DEV_UNKNOWN
;
1387 if (ap
->ops
->probe_reset
) {
1388 rc
= ap
->ops
->probe_reset(ap
, classes
);
1390 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1394 ap
->ops
->phy_reset(ap
);
1396 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1397 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1398 classes
[i
] = ap
->device
[i
].class;
1399 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1405 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1406 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1407 classes
[i
] = ATA_DEV_NONE
;
1409 /* read IDENTIFY page and configure devices */
1410 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1411 dev
= &ap
->device
[i
];
1414 dev
->class = classes
[i
];
1416 if (!ata_dev_enabled(dev
))
1419 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, dev
->id
);
1423 rc
= ata_dev_configure(ap
, dev
, 1);
1428 /* configure transfer mode */
1429 rc
= ata_set_mode(ap
, &dev
);
1435 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1436 if (ata_dev_enabled(&ap
->device
[i
]))
1439 /* no device present, disable port */
1440 ata_port_disable(ap
);
1441 ap
->ops
->port_disable(ap
);
1448 tries
[dev
->devno
] = 0;
1451 sata_down_spd_limit(ap
);
1454 tries
[dev
->devno
]--;
1455 if (down_xfermask
&&
1456 ata_down_xfermask_limit(ap
, dev
, tries
[dev
->devno
] == 1))
1457 tries
[dev
->devno
] = 0;
1460 if (!tries
[dev
->devno
]) {
1461 ata_down_xfermask_limit(ap
, dev
, 1);
1462 ata_dev_disable(ap
, dev
);
1469 * ata_port_probe - Mark port as enabled
1470 * @ap: Port for which we indicate enablement
1472 * Modify @ap data structure such that the system
1473 * thinks that the entire port is enabled.
1475 * LOCKING: host_set lock, or some other form of
1479 void ata_port_probe(struct ata_port
*ap
)
1481 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1485 * sata_print_link_status - Print SATA link status
1486 * @ap: SATA port to printk link status about
1488 * This function prints link speed and status of a SATA link.
1493 static void sata_print_link_status(struct ata_port
*ap
)
1495 u32 sstatus
, scontrol
, tmp
;
1497 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1499 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1501 if (ata_port_online(ap
)) {
1502 tmp
= (sstatus
>> 4) & 0xf;
1504 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1505 ap
->id
, sata_spd_string(tmp
), sstatus
, scontrol
);
1508 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1509 ap
->id
, sstatus
, scontrol
);
1514 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1515 * @ap: SATA port associated with target SATA PHY.
1517 * This function issues commands to standard SATA Sxxx
1518 * PHY registers, to wake up the phy (and device), and
1519 * clear any reset condition.
1522 * PCI/etc. bus probe sem.
1525 void __sata_phy_reset(struct ata_port
*ap
)
1528 unsigned long timeout
= jiffies
+ (HZ
* 5);
1530 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1531 /* issue phy wake/reset */
1532 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1533 /* Couldn't find anything in SATA I/II specs, but
1534 * AHCI-1.1 10.4.2 says at least 1 ms. */
1537 /* phy wake/clear reset */
1538 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1540 /* wait for phy to become ready, if necessary */
1543 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1544 if ((sstatus
& 0xf) != 1)
1546 } while (time_before(jiffies
, timeout
));
1548 /* print link status */
1549 sata_print_link_status(ap
);
1551 /* TODO: phy layer with polling, timeouts, etc. */
1552 if (!ata_port_offline(ap
))
1555 ata_port_disable(ap
);
1557 if (ap
->flags
& ATA_FLAG_DISABLED
)
1560 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1561 ata_port_disable(ap
);
1565 ap
->cbl
= ATA_CBL_SATA
;
1569 * sata_phy_reset - Reset SATA bus.
1570 * @ap: SATA port associated with target SATA PHY.
1572 * This function resets the SATA bus, and then probes
1573 * the bus for devices.
1576 * PCI/etc. bus probe sem.
1579 void sata_phy_reset(struct ata_port
*ap
)
1581 __sata_phy_reset(ap
);
1582 if (ap
->flags
& ATA_FLAG_DISABLED
)
1588 * ata_dev_pair - return other device on cable
1592 * Obtain the other device on the same cable, or if none is
1593 * present NULL is returned
1596 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1598 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1599 if (!ata_dev_enabled(pair
))
1605 * ata_port_disable - Disable port.
1606 * @ap: Port to be disabled.
1608 * Modify @ap data structure such that the system
1609 * thinks that the entire port is disabled, and should
1610 * never attempt to probe or communicate with devices
1613 * LOCKING: host_set lock, or some other form of
1617 void ata_port_disable(struct ata_port
*ap
)
1619 ap
->device
[0].class = ATA_DEV_NONE
;
1620 ap
->device
[1].class = ATA_DEV_NONE
;
1621 ap
->flags
|= ATA_FLAG_DISABLED
;
1625 * sata_down_spd_limit - adjust SATA spd limit downward
1626 * @ap: Port to adjust SATA spd limit for
1628 * Adjust SATA spd limit of @ap downward. Note that this
1629 * function only adjusts the limit. The change must be applied
1630 * using sata_set_spd().
1633 * Inherited from caller.
1636 * 0 on success, negative errno on failure
1638 int sata_down_spd_limit(struct ata_port
*ap
)
1640 u32 sstatus
, spd
, mask
;
1643 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1647 mask
= ap
->sata_spd_limit
;
1650 highbit
= fls(mask
) - 1;
1651 mask
&= ~(1 << highbit
);
1653 spd
= (sstatus
>> 4) & 0xf;
1657 mask
&= (1 << spd
) - 1;
1661 ap
->sata_spd_limit
= mask
;
1663 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1664 ap
->id
, sata_spd_string(fls(mask
)));
1669 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1673 if (ap
->sata_spd_limit
== UINT_MAX
)
1676 limit
= fls(ap
->sata_spd_limit
);
1678 spd
= (*scontrol
>> 4) & 0xf;
1679 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1681 return spd
!= limit
;
1685 * sata_set_spd_needed - is SATA spd configuration needed
1686 * @ap: Port in question
1688 * Test whether the spd limit in SControl matches
1689 * @ap->sata_spd_limit. This function is used to determine
1690 * whether hardreset is necessary to apply SATA spd
1694 * Inherited from caller.
1697 * 1 if SATA spd configuration is needed, 0 otherwise.
1699 int sata_set_spd_needed(struct ata_port
*ap
)
1703 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1706 return __sata_set_spd_needed(ap
, &scontrol
);
1710 * sata_set_spd - set SATA spd according to spd limit
1711 * @ap: Port to set SATA spd for
1713 * Set SATA spd of @ap according to sata_spd_limit.
1716 * Inherited from caller.
1719 * 0 if spd doesn't need to be changed, 1 if spd has been
1720 * changed. Negative errno if SCR registers are inaccessible.
1722 int sata_set_spd(struct ata_port
*ap
)
1727 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1730 if (!__sata_set_spd_needed(ap
, &scontrol
))
1733 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1740 * This mode timing computation functionality is ported over from
1741 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1744 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1745 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1746 * for PIO 5, which is a nonstandard extension and UDMA6, which
1747 * is currently supported only by Maxtor drives.
1750 static const struct ata_timing ata_timing
[] = {
1752 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1753 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1754 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1755 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1757 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1758 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1759 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1761 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1763 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1764 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1765 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1767 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1768 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1769 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1771 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1772 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1773 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1775 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1776 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1777 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1779 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1784 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1785 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1787 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1789 q
->setup
= EZ(t
->setup
* 1000, T
);
1790 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1791 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1792 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1793 q
->active
= EZ(t
->active
* 1000, T
);
1794 q
->recover
= EZ(t
->recover
* 1000, T
);
1795 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1796 q
->udma
= EZ(t
->udma
* 1000, UT
);
1799 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1800 struct ata_timing
*m
, unsigned int what
)
1802 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1803 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1804 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1805 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1806 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1807 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1808 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1809 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1812 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1814 const struct ata_timing
*t
;
1816 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1817 if (t
->mode
== 0xFF)
1822 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1823 struct ata_timing
*t
, int T
, int UT
)
1825 const struct ata_timing
*s
;
1826 struct ata_timing p
;
1832 if (!(s
= ata_timing_find_mode(speed
)))
1835 memcpy(t
, s
, sizeof(*s
));
1838 * If the drive is an EIDE drive, it can tell us it needs extended
1839 * PIO/MW_DMA cycle timing.
1842 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1843 memset(&p
, 0, sizeof(p
));
1844 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1845 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1846 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1847 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1848 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1850 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1854 * Convert the timing to bus clock counts.
1857 ata_timing_quantize(t
, t
, T
, UT
);
1860 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1861 * S.M.A.R.T * and some other commands. We have to ensure that the
1862 * DMA cycle timing is slower/equal than the fastest PIO timing.
1865 if (speed
> XFER_PIO_4
) {
1866 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1867 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1871 * Lengthen active & recovery time so that cycle time is correct.
1874 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1875 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1876 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1879 if (t
->active
+ t
->recover
< t
->cycle
) {
1880 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1881 t
->recover
= t
->cycle
- t
->active
;
1888 * ata_down_xfermask_limit - adjust dev xfer masks downward
1889 * @ap: Port associated with device @dev
1890 * @dev: Device to adjust xfer masks
1891 * @force_pio0: Force PIO0
1893 * Adjust xfer masks of @dev downward. Note that this function
1894 * does not apply the change. Invoking ata_set_mode() afterwards
1895 * will apply the limit.
1898 * Inherited from caller.
1901 * 0 on success, negative errno on failure
1903 int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
1906 unsigned long xfer_mask
;
1909 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1914 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1915 if (xfer_mask
& ATA_MASK_UDMA
)
1916 xfer_mask
&= ~ATA_MASK_MWDMA
;
1918 highbit
= fls(xfer_mask
) - 1;
1919 xfer_mask
&= ~(1 << highbit
);
1921 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1925 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1928 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1929 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1937 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1939 unsigned int err_mask
;
1942 dev
->flags
&= ~ATA_DFLAG_PIO
;
1943 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1944 dev
->flags
|= ATA_DFLAG_PIO
;
1946 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1949 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1954 rc
= ata_dev_revalidate(ap
, dev
, 0);
1958 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1959 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1961 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1963 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1968 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1969 * @ap: port on which timings will be programmed
1970 * @r_failed_dev: out paramter for failed device
1972 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1973 * ata_set_mode() fails, pointer to the failing device is
1974 * returned in @r_failed_dev.
1977 * PCI/etc. bus probe sem.
1980 * 0 on success, negative errno otherwise
1982 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1984 struct ata_device
*dev
;
1985 int i
, rc
= 0, used_dma
= 0, found
= 0;
1987 /* has private set_mode? */
1988 if (ap
->ops
->set_mode
) {
1989 /* FIXME: make ->set_mode handle no device case and
1990 * return error code and failing device on failure.
1992 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1993 if (ata_dev_enabled(&ap
->device
[i
])) {
1994 ap
->ops
->set_mode(ap
);
2001 /* step 1: calculate xfer_mask */
2002 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2003 unsigned int pio_mask
, dma_mask
;
2005 dev
= &ap
->device
[i
];
2007 if (!ata_dev_enabled(dev
))
2010 ata_dev_xfermask(ap
, dev
);
2012 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2013 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2014 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2015 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2024 /* step 2: always set host PIO timings */
2025 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2026 dev
= &ap
->device
[i
];
2027 if (!ata_dev_enabled(dev
))
2030 if (!dev
->pio_mode
) {
2031 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2032 ap
->id
, dev
->devno
);
2037 dev
->xfer_mode
= dev
->pio_mode
;
2038 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2039 if (ap
->ops
->set_piomode
)
2040 ap
->ops
->set_piomode(ap
, dev
);
2043 /* step 3: set host DMA timings */
2044 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2045 dev
= &ap
->device
[i
];
2047 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2050 dev
->xfer_mode
= dev
->dma_mode
;
2051 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2052 if (ap
->ops
->set_dmamode
)
2053 ap
->ops
->set_dmamode(ap
, dev
);
2056 /* step 4: update devices' xfer mode */
2057 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2058 dev
= &ap
->device
[i
];
2060 if (!ata_dev_enabled(dev
))
2063 rc
= ata_dev_set_mode(ap
, dev
);
2068 /* Record simplex status. If we selected DMA then the other
2069 * host channels are not permitted to do so.
2071 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2072 ap
->host_set
->simplex_claimed
= 1;
2074 /* step5: chip specific finalisation */
2075 if (ap
->ops
->post_set_mode
)
2076 ap
->ops
->post_set_mode(ap
);
2080 *r_failed_dev
= dev
;
2085 * ata_tf_to_host - issue ATA taskfile to host controller
2086 * @ap: port to which command is being issued
2087 * @tf: ATA taskfile register set
2089 * Issues ATA taskfile register set to ATA host controller,
2090 * with proper synchronization with interrupt handler and
2094 * spin_lock_irqsave(host_set lock)
2097 static inline void ata_tf_to_host(struct ata_port
*ap
,
2098 const struct ata_taskfile
*tf
)
2100 ap
->ops
->tf_load(ap
, tf
);
2101 ap
->ops
->exec_command(ap
, tf
);
2105 * ata_busy_sleep - sleep until BSY clears, or timeout
2106 * @ap: port containing status register to be polled
2107 * @tmout_pat: impatience timeout
2108 * @tmout: overall timeout
2110 * Sleep until ATA Status register bit BSY clears,
2111 * or a timeout occurs.
2116 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2117 unsigned long tmout_pat
, unsigned long tmout
)
2119 unsigned long timer_start
, timeout
;
2122 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2123 timer_start
= jiffies
;
2124 timeout
= timer_start
+ tmout_pat
;
2125 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2127 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2130 if (status
& ATA_BUSY
)
2131 printk(KERN_WARNING
"ata%u is slow to respond, "
2132 "please be patient\n", ap
->id
);
2134 timeout
= timer_start
+ tmout
;
2135 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2137 status
= ata_chk_status(ap
);
2140 if (status
& ATA_BUSY
) {
2141 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2142 ap
->id
, tmout
/ HZ
);
2149 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2151 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2152 unsigned int dev0
= devmask
& (1 << 0);
2153 unsigned int dev1
= devmask
& (1 << 1);
2154 unsigned long timeout
;
2156 /* if device 0 was found in ata_devchk, wait for its
2160 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2162 /* if device 1 was found in ata_devchk, wait for
2163 * register access, then wait for BSY to clear
2165 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2169 ap
->ops
->dev_select(ap
, 1);
2170 if (ap
->flags
& ATA_FLAG_MMIO
) {
2171 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2172 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2174 nsect
= inb(ioaddr
->nsect_addr
);
2175 lbal
= inb(ioaddr
->lbal_addr
);
2177 if ((nsect
== 1) && (lbal
== 1))
2179 if (time_after(jiffies
, timeout
)) {
2183 msleep(50); /* give drive a breather */
2186 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2188 /* is all this really necessary? */
2189 ap
->ops
->dev_select(ap
, 0);
2191 ap
->ops
->dev_select(ap
, 1);
2193 ap
->ops
->dev_select(ap
, 0);
2196 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2197 unsigned int devmask
)
2199 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2201 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2203 /* software reset. causes dev0 to be selected */
2204 if (ap
->flags
& ATA_FLAG_MMIO
) {
2205 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2206 udelay(20); /* FIXME: flush */
2207 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2208 udelay(20); /* FIXME: flush */
2209 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2211 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2213 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2215 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2218 /* spec mandates ">= 2ms" before checking status.
2219 * We wait 150ms, because that was the magic delay used for
2220 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2221 * between when the ATA command register is written, and then
2222 * status is checked. Because waiting for "a while" before
2223 * checking status is fine, post SRST, we perform this magic
2224 * delay here as well.
2226 * Old drivers/ide uses the 2mS rule and then waits for ready
2230 /* Before we perform post reset processing we want to see if
2231 * the bus shows 0xFF because the odd clown forgets the D7
2232 * pulldown resistor.
2234 if (ata_check_status(ap
) == 0xFF) {
2235 printk(KERN_ERR
"ata%u: SRST failed (status 0xFF)\n", ap
->id
);
2236 return AC_ERR_OTHER
;
2239 ata_bus_post_reset(ap
, devmask
);
2245 * ata_bus_reset - reset host port and associated ATA channel
2246 * @ap: port to reset
2248 * This is typically the first time we actually start issuing
2249 * commands to the ATA channel. We wait for BSY to clear, then
2250 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2251 * result. Determine what devices, if any, are on the channel
2252 * by looking at the device 0/1 error register. Look at the signature
2253 * stored in each device's taskfile registers, to determine if
2254 * the device is ATA or ATAPI.
2257 * PCI/etc. bus probe sem.
2258 * Obtains host_set lock.
2261 * Sets ATA_FLAG_DISABLED if bus reset fails.
2264 void ata_bus_reset(struct ata_port
*ap
)
2266 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2267 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2269 unsigned int dev0
, dev1
= 0, devmask
= 0;
2271 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2273 /* determine if device 0/1 are present */
2274 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2277 dev0
= ata_devchk(ap
, 0);
2279 dev1
= ata_devchk(ap
, 1);
2283 devmask
|= (1 << 0);
2285 devmask
|= (1 << 1);
2287 /* select device 0 again */
2288 ap
->ops
->dev_select(ap
, 0);
2290 /* issue bus reset */
2291 if (ap
->flags
& ATA_FLAG_SRST
)
2292 if (ata_bus_softreset(ap
, devmask
))
2296 * determine by signature whether we have ATA or ATAPI devices
2298 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2299 if ((slave_possible
) && (err
!= 0x81))
2300 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2302 /* re-enable interrupts */
2303 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2306 /* is double-select really necessary? */
2307 if (ap
->device
[1].class != ATA_DEV_NONE
)
2308 ap
->ops
->dev_select(ap
, 1);
2309 if (ap
->device
[0].class != ATA_DEV_NONE
)
2310 ap
->ops
->dev_select(ap
, 0);
2312 /* if no devices were detected, disable this port */
2313 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2314 (ap
->device
[1].class == ATA_DEV_NONE
))
2317 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2318 /* set up device control for ATA_FLAG_SATA_RESET */
2319 if (ap
->flags
& ATA_FLAG_MMIO
)
2320 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2322 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2329 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2330 ap
->ops
->port_disable(ap
);
2335 static int sata_phy_resume(struct ata_port
*ap
)
2337 unsigned long timeout
= jiffies
+ (HZ
* 5);
2338 u32 scontrol
, sstatus
;
2341 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2344 scontrol
= (scontrol
& 0x0f0) | 0x300;
2346 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2349 /* Wait for phy to become ready, if necessary. */
2352 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2354 if ((sstatus
& 0xf) != 1)
2356 } while (time_before(jiffies
, timeout
));
2362 * ata_std_probeinit - initialize probing
2363 * @ap: port to be probed
2365 * @ap is about to be probed. Initialize it. This function is
2366 * to be used as standard callback for ata_drive_probe_reset().
2368 * NOTE!!! Do not use this function as probeinit if a low level
2369 * driver implements only hardreset. Just pass NULL as probeinit
2370 * in that case. Using this function is probably okay but doing
2371 * so makes reset sequence different from the original
2372 * ->phy_reset implementation and Jeff nervous. :-P
2374 void ata_std_probeinit(struct ata_port
*ap
)
2379 sata_phy_resume(ap
);
2381 /* init sata_spd_limit to the current value */
2382 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2383 int spd
= (scontrol
>> 4) & 0xf;
2384 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2387 /* wait for device */
2388 if (ata_port_online(ap
))
2389 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2393 * ata_std_softreset - reset host port via ATA SRST
2394 * @ap: port to reset
2395 * @classes: resulting classes of attached devices
2397 * Reset host port using ATA SRST. This function is to be used
2398 * as standard callback for ata_drive_*_reset() functions.
2401 * Kernel thread context (may sleep)
2404 * 0 on success, -errno otherwise.
2406 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2408 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2409 unsigned int devmask
= 0, err_mask
;
2414 if (ata_port_offline(ap
)) {
2415 classes
[0] = ATA_DEV_NONE
;
2419 /* determine if device 0/1 are present */
2420 if (ata_devchk(ap
, 0))
2421 devmask
|= (1 << 0);
2422 if (slave_possible
&& ata_devchk(ap
, 1))
2423 devmask
|= (1 << 1);
2425 /* select device 0 again */
2426 ap
->ops
->dev_select(ap
, 0);
2428 /* issue bus reset */
2429 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2430 err_mask
= ata_bus_softreset(ap
, devmask
);
2432 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2437 /* determine by signature whether we have ATA or ATAPI devices */
2438 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2439 if (slave_possible
&& err
!= 0x81)
2440 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2443 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2448 * sata_std_hardreset - reset host port via SATA phy reset
2449 * @ap: port to reset
2450 * @class: resulting class of attached device
2452 * SATA phy-reset host port using DET bits of SControl register.
2453 * This function is to be used as standard callback for
2454 * ata_drive_*_reset().
2457 * Kernel thread context (may sleep)
2460 * 0 on success, -errno otherwise.
2462 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2469 if (sata_set_spd_needed(ap
)) {
2470 /* SATA spec says nothing about how to reconfigure
2471 * spd. To be on the safe side, turn off phy during
2472 * reconfiguration. This works for at least ICH7 AHCI
2475 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2478 scontrol
= (scontrol
& 0x0f0) | 0x302;
2480 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2486 /* issue phy wake/reset */
2487 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2490 scontrol
= (scontrol
& 0x0f0) | 0x301;
2492 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2495 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2496 * 10.4.2 says at least 1 ms.
2500 /* bring phy back */
2501 sata_phy_resume(ap
);
2503 /* TODO: phy layer with polling, timeouts, etc. */
2504 if (ata_port_offline(ap
)) {
2505 *class = ATA_DEV_NONE
;
2506 DPRINTK("EXIT, link offline\n");
2510 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2512 "ata%u: COMRESET failed (device not ready)\n", ap
->id
);
2516 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2518 *class = ata_dev_try_classify(ap
, 0, NULL
);
2520 DPRINTK("EXIT, class=%u\n", *class);
2525 * ata_std_postreset - standard postreset callback
2526 * @ap: the target ata_port
2527 * @classes: classes of attached devices
2529 * This function is invoked after a successful reset. Note that
2530 * the device might have been reset more than once using
2531 * different reset methods before postreset is invoked.
2533 * This function is to be used as standard callback for
2534 * ata_drive_*_reset().
2537 * Kernel thread context (may sleep)
2539 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2543 /* print link status */
2544 sata_print_link_status(ap
);
2546 /* re-enable interrupts */
2547 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2550 /* is double-select really necessary? */
2551 if (classes
[0] != ATA_DEV_NONE
)
2552 ap
->ops
->dev_select(ap
, 1);
2553 if (classes
[1] != ATA_DEV_NONE
)
2554 ap
->ops
->dev_select(ap
, 0);
2556 /* bail out if no device is present */
2557 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2558 DPRINTK("EXIT, no device\n");
2562 /* set up device control */
2563 if (ap
->ioaddr
.ctl_addr
) {
2564 if (ap
->flags
& ATA_FLAG_MMIO
)
2565 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2567 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2574 * ata_std_probe_reset - standard probe reset method
2575 * @ap: prot to perform probe-reset
2576 * @classes: resulting classes of attached devices
2578 * The stock off-the-shelf ->probe_reset method.
2581 * Kernel thread context (may sleep)
2584 * 0 on success, -errno otherwise.
2586 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2588 ata_reset_fn_t hardreset
;
2591 if (sata_scr_valid(ap
))
2592 hardreset
= sata_std_hardreset
;
2594 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2595 ata_std_softreset
, hardreset
,
2596 ata_std_postreset
, classes
);
2599 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2600 unsigned int *classes
)
2604 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2605 classes
[i
] = ATA_DEV_UNKNOWN
;
2607 rc
= reset(ap
, classes
);
2611 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2612 * is complete and convert all ATA_DEV_UNKNOWN to
2615 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2616 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2619 if (i
< ATA_MAX_DEVICES
)
2620 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2621 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2622 classes
[i
] = ATA_DEV_NONE
;
2628 * ata_drive_probe_reset - Perform probe reset with given methods
2629 * @ap: port to reset
2630 * @probeinit: probeinit method (can be NULL)
2631 * @softreset: softreset method (can be NULL)
2632 * @hardreset: hardreset method (can be NULL)
2633 * @postreset: postreset method (can be NULL)
2634 * @classes: resulting classes of attached devices
2636 * Reset the specified port and classify attached devices using
2637 * given methods. This function prefers softreset but tries all
2638 * possible reset sequences to reset and classify devices. This
2639 * function is intended to be used for constructing ->probe_reset
2640 * callback by low level drivers.
2642 * Reset methods should follow the following rules.
2644 * - Return 0 on sucess, -errno on failure.
2645 * - If classification is supported, fill classes[] with
2646 * recognized class codes.
2647 * - If classification is not supported, leave classes[] alone.
2650 * Kernel thread context (may sleep)
2653 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2654 * if classification fails, and any error code from reset
2657 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2658 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2659 ata_postreset_fn_t postreset
, unsigned int *classes
)
2666 if (softreset
&& !sata_set_spd_needed(ap
)) {
2667 rc
= ata_do_reset(ap
, softreset
, classes
);
2668 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2670 printk(KERN_INFO
"ata%u: softreset failed, will try "
2671 "hardreset in 5 secs\n", ap
->id
);
2679 rc
= ata_do_reset(ap
, hardreset
, classes
);
2681 if (classes
[0] != ATA_DEV_UNKNOWN
)
2686 if (sata_down_spd_limit(ap
))
2689 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2690 "in 5 secs\n", ap
->id
);
2695 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2696 "classification, will retry softreset in 5 secs\n",
2700 rc
= ata_do_reset(ap
, softreset
, classes
);
2706 postreset(ap
, classes
);
2707 if (classes
[0] == ATA_DEV_UNKNOWN
)
2714 * ata_dev_same_device - Determine whether new ID matches configured device
2715 * @ap: port on which the device to compare against resides
2716 * @dev: device to compare against
2717 * @new_class: class of the new device
2718 * @new_id: IDENTIFY page of the new device
2720 * Compare @new_class and @new_id against @dev and determine
2721 * whether @dev is the device indicated by @new_class and
2728 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2730 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2731 unsigned int new_class
, const u16
*new_id
)
2733 const u16
*old_id
= dev
->id
;
2734 unsigned char model
[2][41], serial
[2][21];
2737 if (dev
->class != new_class
) {
2739 "ata%u: dev %u class mismatch %d != %d\n",
2740 ap
->id
, dev
->devno
, dev
->class, new_class
);
2744 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2745 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2746 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2747 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2748 new_n_sectors
= ata_id_n_sectors(new_id
);
2750 if (strcmp(model
[0], model
[1])) {
2752 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2753 ap
->id
, dev
->devno
, model
[0], model
[1]);
2757 if (strcmp(serial
[0], serial
[1])) {
2759 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2760 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2764 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2766 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2767 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2768 (unsigned long long)new_n_sectors
);
2776 * ata_dev_revalidate - Revalidate ATA device
2777 * @ap: port on which the device to revalidate resides
2778 * @dev: device to revalidate
2779 * @post_reset: is this revalidation after reset?
2781 * Re-read IDENTIFY page and make sure @dev is still attached to
2785 * Kernel thread context (may sleep)
2788 * 0 on success, negative errno otherwise
2790 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2793 unsigned int class = dev
->class;
2794 u16
*id
= (void *)ap
->sector_buf
;
2797 if (!ata_dev_enabled(dev
)) {
2803 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, id
);
2807 /* is the device still there? */
2808 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2813 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2815 /* configure device according to the new ID */
2816 rc
= ata_dev_configure(ap
, dev
, 0);
2821 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2822 ap
->id
, dev
->devno
, rc
);
2826 static const char * const ata_dma_blacklist
[] = {
2827 "WDC AC11000H", NULL
,
2828 "WDC AC22100H", NULL
,
2829 "WDC AC32500H", NULL
,
2830 "WDC AC33100H", NULL
,
2831 "WDC AC31600H", NULL
,
2832 "WDC AC32100H", "24.09P07",
2833 "WDC AC23200L", "21.10N21",
2834 "Compaq CRD-8241B", NULL
,
2839 "SanDisk SDP3B", NULL
,
2840 "SanDisk SDP3B-64", NULL
,
2841 "SANYO CD-ROM CRD", NULL
,
2842 "HITACHI CDR-8", NULL
,
2843 "HITACHI CDR-8335", NULL
,
2844 "HITACHI CDR-8435", NULL
,
2845 "Toshiba CD-ROM XM-6202B", NULL
,
2846 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2848 "E-IDE CD-ROM CR-840", NULL
,
2849 "CD-ROM Drive/F5A", NULL
,
2850 "WPI CDD-820", NULL
,
2851 "SAMSUNG CD-ROM SC-148C", NULL
,
2852 "SAMSUNG CD-ROM SC", NULL
,
2853 "SanDisk SDP3B-64", NULL
,
2854 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2855 "_NEC DV5800A", NULL
,
2856 "SAMSUNG CD-ROM SN-124", "N001"
2859 static int ata_strim(char *s
, size_t len
)
2861 len
= strnlen(s
, len
);
2863 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2864 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2871 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2873 unsigned char model_num
[40];
2874 unsigned char model_rev
[16];
2875 unsigned int nlen
, rlen
;
2878 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2880 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2882 nlen
= ata_strim(model_num
, sizeof(model_num
));
2883 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2885 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2886 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2887 if (ata_dma_blacklist
[i
+1] == NULL
)
2889 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2897 * ata_dev_xfermask - Compute supported xfermask of the given device
2898 * @ap: Port on which the device to compute xfermask for resides
2899 * @dev: Device to compute xfermask for
2901 * Compute supported xfermask of @dev and store it in
2902 * dev->*_mask. This function is responsible for applying all
2903 * known limits including host controller limits, device
2906 * FIXME: The current implementation limits all transfer modes to
2907 * the fastest of the lowested device on the port. This is not
2908 * required on most controllers.
2913 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2915 struct ata_host_set
*hs
= ap
->host_set
;
2916 unsigned long xfer_mask
;
2919 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2920 ap
->mwdma_mask
, ap
->udma_mask
);
2922 /* Apply cable rule here. Don't apply it early because when
2923 * we handle hot plug the cable type can itself change.
2925 if (ap
->cbl
== ATA_CBL_PATA40
)
2926 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2928 /* FIXME: Use port-wide xfermask for now */
2929 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2930 struct ata_device
*d
= &ap
->device
[i
];
2932 if (ata_dev_absent(d
))
2935 if (ata_dev_disabled(d
)) {
2936 /* to avoid violating device selection timing */
2937 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2938 UINT_MAX
, UINT_MAX
);
2942 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2943 d
->mwdma_mask
, d
->udma_mask
);
2944 xfer_mask
&= ata_id_xfermask(d
->id
);
2945 if (ata_dma_blacklisted(d
))
2946 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2949 if (ata_dma_blacklisted(dev
))
2950 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2951 "disabling DMA\n", ap
->id
, dev
->devno
);
2953 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2954 if (hs
->simplex_claimed
)
2955 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2958 if (ap
->ops
->mode_filter
)
2959 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2961 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2962 &dev
->mwdma_mask
, &dev
->udma_mask
);
2966 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2967 * @ap: Port associated with device @dev
2968 * @dev: Device to which command will be sent
2970 * Issue SET FEATURES - XFER MODE command to device @dev
2974 * PCI/etc. bus probe sem.
2977 * 0 on success, AC_ERR_* mask otherwise.
2980 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2981 struct ata_device
*dev
)
2983 struct ata_taskfile tf
;
2984 unsigned int err_mask
;
2986 /* set up set-features taskfile */
2987 DPRINTK("set features - xfer mode\n");
2989 ata_tf_init(ap
, &tf
, dev
->devno
);
2990 tf
.command
= ATA_CMD_SET_FEATURES
;
2991 tf
.feature
= SETFEATURES_XFER
;
2992 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2993 tf
.protocol
= ATA_PROT_NODATA
;
2994 tf
.nsect
= dev
->xfer_mode
;
2996 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
2998 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3003 * ata_dev_init_params - Issue INIT DEV PARAMS command
3004 * @ap: Port associated with device @dev
3005 * @dev: Device to which command will be sent
3008 * Kernel thread context (may sleep)
3011 * 0 on success, AC_ERR_* mask otherwise.
3014 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
3015 struct ata_device
*dev
,
3019 struct ata_taskfile tf
;
3020 unsigned int err_mask
;
3022 /* Number of sectors per track 1-255. Number of heads 1-16 */
3023 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3024 return AC_ERR_INVALID
;
3026 /* set up init dev params taskfile */
3027 DPRINTK("init dev params \n");
3029 ata_tf_init(ap
, &tf
, dev
->devno
);
3030 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3031 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3032 tf
.protocol
= ATA_PROT_NODATA
;
3034 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3036 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3038 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3043 * ata_sg_clean - Unmap DMA memory associated with command
3044 * @qc: Command containing DMA memory to be released
3046 * Unmap all mapped DMA memory associated with this command.
3049 * spin_lock_irqsave(host_set lock)
3052 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3054 struct ata_port
*ap
= qc
->ap
;
3055 struct scatterlist
*sg
= qc
->__sg
;
3056 int dir
= qc
->dma_dir
;
3057 void *pad_buf
= NULL
;
3059 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3060 WARN_ON(sg
== NULL
);
3062 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3063 WARN_ON(qc
->n_elem
> 1);
3065 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3067 /* if we padded the buffer out to 32-bit bound, and data
3068 * xfer direction is from-device, we must copy from the
3069 * pad buffer back into the supplied buffer
3071 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3072 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3074 if (qc
->flags
& ATA_QCFLAG_SG
) {
3076 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3077 /* restore last sg */
3078 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3080 struct scatterlist
*psg
= &qc
->pad_sgent
;
3081 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3082 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3083 kunmap_atomic(addr
, KM_IRQ0
);
3087 dma_unmap_single(ap
->dev
,
3088 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3091 sg
->length
+= qc
->pad_len
;
3093 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3094 pad_buf
, qc
->pad_len
);
3097 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3102 * ata_fill_sg - Fill PCI IDE PRD table
3103 * @qc: Metadata associated with taskfile to be transferred
3105 * Fill PCI IDE PRD (scatter-gather) table with segments
3106 * associated with the current disk command.
3109 * spin_lock_irqsave(host_set lock)
3112 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3114 struct ata_port
*ap
= qc
->ap
;
3115 struct scatterlist
*sg
;
3118 WARN_ON(qc
->__sg
== NULL
);
3119 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3122 ata_for_each_sg(sg
, qc
) {
3126 /* determine if physical DMA addr spans 64K boundary.
3127 * Note h/w doesn't support 64-bit, so we unconditionally
3128 * truncate dma_addr_t to u32.
3130 addr
= (u32
) sg_dma_address(sg
);
3131 sg_len
= sg_dma_len(sg
);
3134 offset
= addr
& 0xffff;
3136 if ((offset
+ sg_len
) > 0x10000)
3137 len
= 0x10000 - offset
;
3139 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3140 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3141 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3150 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3153 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3154 * @qc: Metadata associated with taskfile to check
3156 * Allow low-level driver to filter ATA PACKET commands, returning
3157 * a status indicating whether or not it is OK to use DMA for the
3158 * supplied PACKET command.
3161 * spin_lock_irqsave(host_set lock)
3163 * RETURNS: 0 when ATAPI DMA can be used
3166 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3168 struct ata_port
*ap
= qc
->ap
;
3169 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3171 if (ap
->ops
->check_atapi_dma
)
3172 rc
= ap
->ops
->check_atapi_dma(qc
);
3177 * ata_qc_prep - Prepare taskfile for submission
3178 * @qc: Metadata associated with taskfile to be prepared
3180 * Prepare ATA taskfile for submission.
3183 * spin_lock_irqsave(host_set lock)
3185 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3187 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3193 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3196 * ata_sg_init_one - Associate command with memory buffer
3197 * @qc: Command to be associated
3198 * @buf: Memory buffer
3199 * @buflen: Length of memory buffer, in bytes.
3201 * Initialize the data-related elements of queued_cmd @qc
3202 * to point to a single memory buffer, @buf of byte length @buflen.
3205 * spin_lock_irqsave(host_set lock)
3208 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3210 struct scatterlist
*sg
;
3212 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3214 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3215 qc
->__sg
= &qc
->sgent
;
3217 qc
->orig_n_elem
= 1;
3221 sg_init_one(sg
, buf
, buflen
);
3225 * ata_sg_init - Associate command with scatter-gather table.
3226 * @qc: Command to be associated
3227 * @sg: Scatter-gather table.
3228 * @n_elem: Number of elements in s/g table.
3230 * Initialize the data-related elements of queued_cmd @qc
3231 * to point to a scatter-gather table @sg, containing @n_elem
3235 * spin_lock_irqsave(host_set lock)
3238 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3239 unsigned int n_elem
)
3241 qc
->flags
|= ATA_QCFLAG_SG
;
3243 qc
->n_elem
= n_elem
;
3244 qc
->orig_n_elem
= n_elem
;
3248 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3249 * @qc: Command with memory buffer to be mapped.
3251 * DMA-map the memory buffer associated with queued_cmd @qc.
3254 * spin_lock_irqsave(host_set lock)
3257 * Zero on success, negative on error.
3260 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3262 struct ata_port
*ap
= qc
->ap
;
3263 int dir
= qc
->dma_dir
;
3264 struct scatterlist
*sg
= qc
->__sg
;
3265 dma_addr_t dma_address
;
3268 /* we must lengthen transfers to end on a 32-bit boundary */
3269 qc
->pad_len
= sg
->length
& 3;
3271 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3272 struct scatterlist
*psg
= &qc
->pad_sgent
;
3274 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3276 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3278 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3279 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3282 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3283 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3285 sg
->length
-= qc
->pad_len
;
3286 if (sg
->length
== 0)
3289 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3290 sg
->length
, qc
->pad_len
);
3298 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3300 if (dma_mapping_error(dma_address
)) {
3302 sg
->length
+= qc
->pad_len
;
3306 sg_dma_address(sg
) = dma_address
;
3307 sg_dma_len(sg
) = sg
->length
;
3310 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3311 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3317 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3318 * @qc: Command with scatter-gather table to be mapped.
3320 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3323 * spin_lock_irqsave(host_set lock)
3326 * Zero on success, negative on error.
3330 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3332 struct ata_port
*ap
= qc
->ap
;
3333 struct scatterlist
*sg
= qc
->__sg
;
3334 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3335 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3337 VPRINTK("ENTER, ata%u\n", ap
->id
);
3338 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3340 /* we must lengthen transfers to end on a 32-bit boundary */
3341 qc
->pad_len
= lsg
->length
& 3;
3343 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3344 struct scatterlist
*psg
= &qc
->pad_sgent
;
3345 unsigned int offset
;
3347 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3349 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3352 * psg->page/offset are used to copy to-be-written
3353 * data in this function or read data in ata_sg_clean.
3355 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3356 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3357 psg
->offset
= offset_in_page(offset
);
3359 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3360 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3361 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3362 kunmap_atomic(addr
, KM_IRQ0
);
3365 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3366 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3368 lsg
->length
-= qc
->pad_len
;
3369 if (lsg
->length
== 0)
3372 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3373 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3376 pre_n_elem
= qc
->n_elem
;
3377 if (trim_sg
&& pre_n_elem
)
3386 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3388 /* restore last sg */
3389 lsg
->length
+= qc
->pad_len
;
3393 DPRINTK("%d sg elements mapped\n", n_elem
);
3396 qc
->n_elem
= n_elem
;
3402 * ata_poll_qc_complete - turn irq back on and finish qc
3403 * @qc: Command to complete
3404 * @err_mask: ATA status register content
3407 * None. (grabs host lock)
3410 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3412 struct ata_port
*ap
= qc
->ap
;
3413 unsigned long flags
;
3415 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3416 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3418 ata_qc_complete(qc
);
3419 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3423 * ata_pio_poll - poll using PIO, depending on current state
3424 * @qc: qc in progress
3427 * None. (executing in kernel thread context)
3430 * timeout value to use
3432 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3434 struct ata_port
*ap
= qc
->ap
;
3436 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3437 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3439 switch (ap
->hsm_task_state
) {
3442 poll_state
= HSM_ST_POLL
;
3446 case HSM_ST_LAST_POLL
:
3447 poll_state
= HSM_ST_LAST_POLL
;
3448 reg_state
= HSM_ST_LAST
;
3455 status
= ata_chk_status(ap
);
3456 if (status
& ATA_BUSY
) {
3457 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3458 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3459 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3462 ap
->hsm_task_state
= poll_state
;
3463 return ATA_SHORT_PAUSE
;
3466 ap
->hsm_task_state
= reg_state
;
3471 * ata_pio_complete - check if drive is busy or idle
3472 * @qc: qc to complete
3475 * None. (executing in kernel thread context)
3478 * Non-zero if qc completed, zero otherwise.
3480 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3482 struct ata_port
*ap
= qc
->ap
;
3486 * This is purely heuristic. This is a fast path. Sometimes when
3487 * we enter, BSY will be cleared in a chk-status or two. If not,
3488 * the drive is probably seeking or something. Snooze for a couple
3489 * msecs, then chk-status again. If still busy, fall back to
3490 * HSM_ST_POLL state.
3492 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3493 if (drv_stat
& ATA_BUSY
) {
3495 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3496 if (drv_stat
& ATA_BUSY
) {
3497 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3498 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3503 drv_stat
= ata_wait_idle(ap
);
3504 if (!ata_ok(drv_stat
)) {
3505 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3506 ap
->hsm_task_state
= HSM_ST_ERR
;
3510 ap
->hsm_task_state
= HSM_ST_IDLE
;
3512 WARN_ON(qc
->err_mask
);
3513 ata_poll_qc_complete(qc
);
3515 /* another command may start at this point */
3522 * swap_buf_le16 - swap halves of 16-bit words in place
3523 * @buf: Buffer to swap
3524 * @buf_words: Number of 16-bit words in buffer.
3526 * Swap halves of 16-bit words if needed to convert from
3527 * little-endian byte order to native cpu byte order, or
3531 * Inherited from caller.
3533 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3538 for (i
= 0; i
< buf_words
; i
++)
3539 buf
[i
] = le16_to_cpu(buf
[i
]);
3540 #endif /* __BIG_ENDIAN */
3544 * ata_mmio_data_xfer - Transfer data by MMIO
3545 * @ap: port to read/write
3547 * @buflen: buffer length
3548 * @write_data: read/write
3550 * Transfer data from/to the device data register by MMIO.
3553 * Inherited from caller.
3556 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3557 unsigned int buflen
, int write_data
)
3560 unsigned int words
= buflen
>> 1;
3561 u16
*buf16
= (u16
*) buf
;
3562 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3564 /* Transfer multiple of 2 bytes */
3566 for (i
= 0; i
< words
; i
++)
3567 writew(le16_to_cpu(buf16
[i
]), mmio
);
3569 for (i
= 0; i
< words
; i
++)
3570 buf16
[i
] = cpu_to_le16(readw(mmio
));
3573 /* Transfer trailing 1 byte, if any. */
3574 if (unlikely(buflen
& 0x01)) {
3575 u16 align_buf
[1] = { 0 };
3576 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3579 memcpy(align_buf
, trailing_buf
, 1);
3580 writew(le16_to_cpu(align_buf
[0]), mmio
);
3582 align_buf
[0] = cpu_to_le16(readw(mmio
));
3583 memcpy(trailing_buf
, align_buf
, 1);
3589 * ata_pio_data_xfer - Transfer data by PIO
3590 * @ap: port to read/write
3592 * @buflen: buffer length
3593 * @write_data: read/write
3595 * Transfer data from/to the device data register by PIO.
3598 * Inherited from caller.
3601 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3602 unsigned int buflen
, int write_data
)
3604 unsigned int words
= buflen
>> 1;
3606 /* Transfer multiple of 2 bytes */
3608 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3610 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3612 /* Transfer trailing 1 byte, if any. */
3613 if (unlikely(buflen
& 0x01)) {
3614 u16 align_buf
[1] = { 0 };
3615 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3618 memcpy(align_buf
, trailing_buf
, 1);
3619 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3621 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3622 memcpy(trailing_buf
, align_buf
, 1);
3628 * ata_data_xfer - Transfer data from/to the data register.
3629 * @ap: port to read/write
3631 * @buflen: buffer length
3632 * @do_write: read/write
3634 * Transfer data from/to the device data register.
3637 * Inherited from caller.
3640 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3641 unsigned int buflen
, int do_write
)
3643 /* Make the crap hardware pay the costs not the good stuff */
3644 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3645 unsigned long flags
;
3646 local_irq_save(flags
);
3647 if (ap
->flags
& ATA_FLAG_MMIO
)
3648 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3650 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3651 local_irq_restore(flags
);
3653 if (ap
->flags
& ATA_FLAG_MMIO
)
3654 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3656 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3661 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3662 * @qc: Command on going
3664 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3667 * Inherited from caller.
3670 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3672 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3673 struct scatterlist
*sg
= qc
->__sg
;
3674 struct ata_port
*ap
= qc
->ap
;
3676 unsigned int offset
;
3679 if (qc
->cursect
== (qc
->nsect
- 1))
3680 ap
->hsm_task_state
= HSM_ST_LAST
;
3682 page
= sg
[qc
->cursg
].page
;
3683 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3685 /* get the current page and offset */
3686 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3687 offset
%= PAGE_SIZE
;
3689 buf
= kmap(page
) + offset
;
3694 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3699 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3701 /* do the actual data transfer */
3702 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3703 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3709 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3710 * @qc: Command on going
3711 * @bytes: number of bytes
3713 * Transfer Transfer data from/to the ATAPI device.
3716 * Inherited from caller.
3720 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3722 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3723 struct scatterlist
*sg
= qc
->__sg
;
3724 struct ata_port
*ap
= qc
->ap
;
3727 unsigned int offset
, count
;
3729 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3730 ap
->hsm_task_state
= HSM_ST_LAST
;
3733 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3735 * The end of qc->sg is reached and the device expects
3736 * more data to transfer. In order not to overrun qc->sg
3737 * and fulfill length specified in the byte count register,
3738 * - for read case, discard trailing data from the device
3739 * - for write case, padding zero data to the device
3741 u16 pad_buf
[1] = { 0 };
3742 unsigned int words
= bytes
>> 1;
3745 if (words
) /* warning if bytes > 1 */
3746 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3749 for (i
= 0; i
< words
; i
++)
3750 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3752 ap
->hsm_task_state
= HSM_ST_LAST
;
3756 sg
= &qc
->__sg
[qc
->cursg
];
3759 offset
= sg
->offset
+ qc
->cursg_ofs
;
3761 /* get the current page and offset */
3762 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3763 offset
%= PAGE_SIZE
;
3765 /* don't overrun current sg */
3766 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3768 /* don't cross page boundaries */
3769 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3771 buf
= kmap(page
) + offset
;
3774 qc
->curbytes
+= count
;
3775 qc
->cursg_ofs
+= count
;
3777 if (qc
->cursg_ofs
== sg
->length
) {
3782 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3784 /* do the actual data transfer */
3785 ata_data_xfer(ap
, buf
, count
, do_write
);
3794 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3795 * @qc: Command on going
3797 * Transfer Transfer data from/to the ATAPI device.
3800 * Inherited from caller.
3803 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3805 struct ata_port
*ap
= qc
->ap
;
3806 struct ata_device
*dev
= qc
->dev
;
3807 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3808 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3810 ap
->ops
->tf_read(ap
, &qc
->tf
);
3811 ireason
= qc
->tf
.nsect
;
3812 bc_lo
= qc
->tf
.lbam
;
3813 bc_hi
= qc
->tf
.lbah
;
3814 bytes
= (bc_hi
<< 8) | bc_lo
;
3816 /* shall be cleared to zero, indicating xfer of data */
3817 if (ireason
& (1 << 0))
3820 /* make sure transfer direction matches expected */
3821 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3822 if (do_write
!= i_write
)
3825 __atapi_pio_bytes(qc
, bytes
);
3830 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3831 ap
->id
, dev
->devno
);
3832 qc
->err_mask
|= AC_ERR_HSM
;
3833 ap
->hsm_task_state
= HSM_ST_ERR
;
3837 * ata_pio_block - start PIO on a block
3838 * @qc: qc to transfer block for
3841 * None. (executing in kernel thread context)
3843 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3845 struct ata_port
*ap
= qc
->ap
;
3849 * This is purely heuristic. This is a fast path.
3850 * Sometimes when we enter, BSY will be cleared in
3851 * a chk-status or two. If not, the drive is probably seeking
3852 * or something. Snooze for a couple msecs, then
3853 * chk-status again. If still busy, fall back to
3854 * HSM_ST_POLL state.
3856 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3857 if (status
& ATA_BUSY
) {
3859 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3860 if (status
& ATA_BUSY
) {
3861 ap
->hsm_task_state
= HSM_ST_POLL
;
3862 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3868 if (status
& (ATA_ERR
| ATA_DF
)) {
3869 qc
->err_mask
|= AC_ERR_DEV
;
3870 ap
->hsm_task_state
= HSM_ST_ERR
;
3874 /* transfer data if any */
3875 if (is_atapi_taskfile(&qc
->tf
)) {
3876 /* DRQ=0 means no more data to transfer */
3877 if ((status
& ATA_DRQ
) == 0) {
3878 ap
->hsm_task_state
= HSM_ST_LAST
;
3882 atapi_pio_bytes(qc
);
3884 /* handle BSY=0, DRQ=0 as error */
3885 if ((status
& ATA_DRQ
) == 0) {
3886 qc
->err_mask
|= AC_ERR_HSM
;
3887 ap
->hsm_task_state
= HSM_ST_ERR
;
3895 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3897 struct ata_port
*ap
= qc
->ap
;
3899 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3900 printk(KERN_WARNING
"ata%u: dev %u PIO error\n",
3901 ap
->id
, qc
->dev
->devno
);
3903 /* make sure qc->err_mask is available to
3904 * know what's wrong and recover
3906 WARN_ON(qc
->err_mask
== 0);
3908 ap
->hsm_task_state
= HSM_ST_IDLE
;
3910 ata_poll_qc_complete(qc
);
3913 static void ata_pio_task(void *_data
)
3915 struct ata_queued_cmd
*qc
= _data
;
3916 struct ata_port
*ap
= qc
->ap
;
3917 unsigned long timeout
;
3924 switch (ap
->hsm_task_state
) {
3933 qc_completed
= ata_pio_complete(qc
);
3937 case HSM_ST_LAST_POLL
:
3938 timeout
= ata_pio_poll(qc
);
3948 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3949 else if (!qc_completed
)
3954 * atapi_packet_task - Write CDB bytes to hardware
3955 * @_data: qc in progress
3957 * When device has indicated its readiness to accept
3958 * a CDB, this function is called. Send the CDB.
3959 * If DMA is to be performed, exit immediately.
3960 * Otherwise, we are in polling mode, so poll
3961 * status under operation succeeds or fails.
3964 * Kernel thread context (may sleep)
3966 static void atapi_packet_task(void *_data
)
3968 struct ata_queued_cmd
*qc
= _data
;
3969 struct ata_port
*ap
= qc
->ap
;
3972 /* sleep-wait for BSY to clear */
3973 DPRINTK("busy wait\n");
3974 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3975 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3979 /* make sure DRQ is set */
3980 status
= ata_chk_status(ap
);
3981 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3982 qc
->err_mask
|= AC_ERR_HSM
;
3987 DPRINTK("send cdb\n");
3988 WARN_ON(qc
->dev
->cdb_len
< 12);
3990 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3991 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3992 unsigned long flags
;
3994 /* Once we're done issuing command and kicking bmdma,
3995 * irq handler takes over. To not lose irq, we need
3996 * to clear NOINTR flag before sending cdb, but
3997 * interrupt handler shouldn't be invoked before we're
3998 * finished. Hence, the following locking.
4000 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4001 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4002 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4003 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4004 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4005 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4007 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4009 /* PIO commands are handled by polling */
4010 ap
->hsm_task_state
= HSM_ST
;
4011 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4017 ata_poll_qc_complete(qc
);
4021 * ata_qc_new - Request an available ATA command, for queueing
4022 * @ap: Port associated with device @dev
4023 * @dev: Device from whom we request an available command structure
4029 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4031 struct ata_queued_cmd
*qc
= NULL
;
4034 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4035 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4036 qc
= ata_qc_from_tag(ap
, i
);
4047 * ata_qc_new_init - Request an available ATA command, and initialize it
4048 * @ap: Port associated with device @dev
4049 * @dev: Device from whom we request an available command structure
4055 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4056 struct ata_device
*dev
)
4058 struct ata_queued_cmd
*qc
;
4060 qc
= ata_qc_new(ap
);
4073 * ata_qc_free - free unused ata_queued_cmd
4074 * @qc: Command to complete
4076 * Designed to free unused ata_queued_cmd object
4077 * in case something prevents using it.
4080 * spin_lock_irqsave(host_set lock)
4082 void ata_qc_free(struct ata_queued_cmd
*qc
)
4084 struct ata_port
*ap
= qc
->ap
;
4087 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4091 if (likely(ata_tag_valid(tag
))) {
4092 qc
->tag
= ATA_TAG_POISON
;
4093 clear_bit(tag
, &ap
->qactive
);
4097 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4099 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4100 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4102 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4105 /* command should be marked inactive atomically with qc completion */
4106 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4108 /* atapi: mark qc as inactive to prevent the interrupt handler
4109 * from completing the command twice later, before the error handler
4110 * is called. (when rc != 0 and atapi request sense is needed)
4112 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4114 /* call completion callback */
4115 qc
->complete_fn(qc
);
4118 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4120 struct ata_port
*ap
= qc
->ap
;
4122 switch (qc
->tf
.protocol
) {
4124 case ATA_PROT_ATAPI_DMA
:
4127 case ATA_PROT_ATAPI
:
4129 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4142 * ata_qc_issue - issue taskfile to device
4143 * @qc: command to issue to device
4145 * Prepare an ATA command to submission to device.
4146 * This includes mapping the data into a DMA-able
4147 * area, filling in the S/G table, and finally
4148 * writing the taskfile to hardware, starting the command.
4151 * spin_lock_irqsave(host_set lock)
4153 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4155 struct ata_port
*ap
= qc
->ap
;
4157 qc
->ap
->active_tag
= qc
->tag
;
4158 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4160 if (ata_should_dma_map(qc
)) {
4161 if (qc
->flags
& ATA_QCFLAG_SG
) {
4162 if (ata_sg_setup(qc
))
4164 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4165 if (ata_sg_setup_one(qc
))
4169 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4172 ap
->ops
->qc_prep(qc
);
4174 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4175 if (unlikely(qc
->err_mask
))
4180 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4181 qc
->err_mask
|= AC_ERR_SYSTEM
;
4183 ata_qc_complete(qc
);
4187 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4188 * @qc: command to issue to device
4190 * Using various libata functions and hooks, this function
4191 * starts an ATA command. ATA commands are grouped into
4192 * classes called "protocols", and issuing each type of protocol
4193 * is slightly different.
4195 * May be used as the qc_issue() entry in ata_port_operations.
4198 * spin_lock_irqsave(host_set lock)
4201 * Zero on success, AC_ERR_* mask on failure
4204 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4206 struct ata_port
*ap
= qc
->ap
;
4208 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4210 switch (qc
->tf
.protocol
) {
4211 case ATA_PROT_NODATA
:
4212 ata_tf_to_host(ap
, &qc
->tf
);
4216 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4217 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4218 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4221 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4222 ata_qc_set_polling(qc
);
4223 ata_tf_to_host(ap
, &qc
->tf
);
4224 ap
->hsm_task_state
= HSM_ST
;
4225 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4228 case ATA_PROT_ATAPI
:
4229 ata_qc_set_polling(qc
);
4230 ata_tf_to_host(ap
, &qc
->tf
);
4231 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4234 case ATA_PROT_ATAPI_NODATA
:
4235 ap
->flags
|= ATA_FLAG_NOINTR
;
4236 ata_tf_to_host(ap
, &qc
->tf
);
4237 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4240 case ATA_PROT_ATAPI_DMA
:
4241 ap
->flags
|= ATA_FLAG_NOINTR
;
4242 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4243 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4244 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4249 return AC_ERR_SYSTEM
;
4256 * ata_host_intr - Handle host interrupt for given (port, task)
4257 * @ap: Port on which interrupt arrived (possibly...)
4258 * @qc: Taskfile currently active in engine
4260 * Handle host interrupt for given queued command. Currently,
4261 * only DMA interrupts are handled. All other commands are
4262 * handled via polling with interrupts disabled (nIEN bit).
4265 * spin_lock_irqsave(host_set lock)
4268 * One if interrupt was handled, zero if not (shared irq).
4271 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4272 struct ata_queued_cmd
*qc
)
4274 u8 status
, host_stat
;
4276 switch (qc
->tf
.protocol
) {
4279 case ATA_PROT_ATAPI_DMA
:
4280 case ATA_PROT_ATAPI
:
4281 /* check status of DMA engine */
4282 host_stat
= ap
->ops
->bmdma_status(ap
);
4283 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4285 /* if it's not our irq... */
4286 if (!(host_stat
& ATA_DMA_INTR
))
4289 /* before we do anything else, clear DMA-Start bit */
4290 ap
->ops
->bmdma_stop(qc
);
4294 case ATA_PROT_ATAPI_NODATA
:
4295 case ATA_PROT_NODATA
:
4296 /* check altstatus */
4297 status
= ata_altstatus(ap
);
4298 if (status
& ATA_BUSY
)
4301 /* check main status, clearing INTRQ */
4302 status
= ata_chk_status(ap
);
4303 if (unlikely(status
& ATA_BUSY
))
4305 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4306 ap
->id
, qc
->tf
.protocol
, status
);
4308 /* ack bmdma irq events */
4309 ap
->ops
->irq_clear(ap
);
4311 /* complete taskfile transaction */
4312 qc
->err_mask
|= ac_err_mask(status
);
4313 ata_qc_complete(qc
);
4320 return 1; /* irq handled */
4323 ap
->stats
.idle_irq
++;
4326 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4327 ata_irq_ack(ap
, 0); /* debug trap */
4328 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4332 return 0; /* irq not handled */
4336 * ata_interrupt - Default ATA host interrupt handler
4337 * @irq: irq line (unused)
4338 * @dev_instance: pointer to our ata_host_set information structure
4341 * Default interrupt handler for PCI IDE devices. Calls
4342 * ata_host_intr() for each port that is not disabled.
4345 * Obtains host_set lock during operation.
4348 * IRQ_NONE or IRQ_HANDLED.
4351 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4353 struct ata_host_set
*host_set
= dev_instance
;
4355 unsigned int handled
= 0;
4356 unsigned long flags
;
4358 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4359 spin_lock_irqsave(&host_set
->lock
, flags
);
4361 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4362 struct ata_port
*ap
;
4364 ap
= host_set
->ports
[i
];
4366 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4367 struct ata_queued_cmd
*qc
;
4369 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4370 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4371 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4372 handled
|= ata_host_intr(ap
, qc
);
4376 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4378 return IRQ_RETVAL(handled
);
4382 * sata_scr_valid - test whether SCRs are accessible
4383 * @ap: ATA port to test SCR accessibility for
4385 * Test whether SCRs are accessible for @ap.
4391 * 1 if SCRs are accessible, 0 otherwise.
4393 int sata_scr_valid(struct ata_port
*ap
)
4395 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4399 * sata_scr_read - read SCR register of the specified port
4400 * @ap: ATA port to read SCR for
4402 * @val: Place to store read value
4404 * Read SCR register @reg of @ap into *@val. This function is
4405 * guaranteed to succeed if the cable type of the port is SATA
4406 * and the port implements ->scr_read.
4412 * 0 on success, negative errno on failure.
4414 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4416 if (sata_scr_valid(ap
)) {
4417 *val
= ap
->ops
->scr_read(ap
, reg
);
4424 * sata_scr_write - write SCR register of the specified port
4425 * @ap: ATA port to write SCR for
4426 * @reg: SCR to write
4427 * @val: value to write
4429 * Write @val to SCR register @reg of @ap. This function is
4430 * guaranteed to succeed if the cable type of the port is SATA
4431 * and the port implements ->scr_read.
4437 * 0 on success, negative errno on failure.
4439 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4441 if (sata_scr_valid(ap
)) {
4442 ap
->ops
->scr_write(ap
, reg
, val
);
4449 * sata_scr_write_flush - write SCR register of the specified port and flush
4450 * @ap: ATA port to write SCR for
4451 * @reg: SCR to write
4452 * @val: value to write
4454 * This function is identical to sata_scr_write() except that this
4455 * function performs flush after writing to the register.
4461 * 0 on success, negative errno on failure.
4463 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4465 if (sata_scr_valid(ap
)) {
4466 ap
->ops
->scr_write(ap
, reg
, val
);
4467 ap
->ops
->scr_read(ap
, reg
);
4474 * ata_port_online - test whether the given port is online
4475 * @ap: ATA port to test
4477 * Test whether @ap is online. Note that this function returns 0
4478 * if online status of @ap cannot be obtained, so
4479 * ata_port_online(ap) != !ata_port_offline(ap).
4485 * 1 if the port online status is available and online.
4487 int ata_port_online(struct ata_port
*ap
)
4491 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4497 * ata_port_offline - test whether the given port is offline
4498 * @ap: ATA port to test
4500 * Test whether @ap is offline. Note that this function returns
4501 * 0 if offline status of @ap cannot be obtained, so
4502 * ata_port_online(ap) != !ata_port_offline(ap).
4508 * 1 if the port offline status is available and offline.
4510 int ata_port_offline(struct ata_port
*ap
)
4514 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4520 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4521 * without filling any other registers
4523 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4526 struct ata_taskfile tf
;
4529 ata_tf_init(ap
, &tf
, dev
->devno
);
4532 tf
.flags
|= ATA_TFLAG_DEVICE
;
4533 tf
.protocol
= ATA_PROT_NODATA
;
4535 err
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4537 printk(KERN_ERR
"%s: ata command failed: %d\n",
4543 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4547 if (!ata_try_flush_cache(dev
))
4550 if (ata_id_has_flush_ext(dev
->id
))
4551 cmd
= ATA_CMD_FLUSH_EXT
;
4553 cmd
= ATA_CMD_FLUSH
;
4555 return ata_do_simple_cmd(ap
, dev
, cmd
);
4558 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4560 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4563 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4565 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4569 * ata_device_resume - wakeup a previously suspended devices
4570 * @ap: port the device is connected to
4571 * @dev: the device to resume
4573 * Kick the drive back into action, by sending it an idle immediate
4574 * command and making sure its transfer mode matches between drive
4578 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4580 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4581 struct ata_device
*failed_dev
;
4582 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4583 while (ata_set_mode(ap
, &failed_dev
))
4584 ata_dev_disable(ap
, failed_dev
);
4586 if (!ata_dev_enabled(dev
))
4588 if (dev
->class == ATA_DEV_ATA
)
4589 ata_start_drive(ap
, dev
);
4595 * ata_device_suspend - prepare a device for suspend
4596 * @ap: port the device is connected to
4597 * @dev: the device to suspend
4599 * Flush the cache on the drive, if appropriate, then issue a
4600 * standbynow command.
4602 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4604 if (!ata_dev_enabled(dev
))
4606 if (dev
->class == ATA_DEV_ATA
)
4607 ata_flush_cache(ap
, dev
);
4609 if (state
.event
!= PM_EVENT_FREEZE
)
4610 ata_standby_drive(ap
, dev
);
4611 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4616 * ata_port_start - Set port up for dma.
4617 * @ap: Port to initialize
4619 * Called just after data structures for each port are
4620 * initialized. Allocates space for PRD table.
4622 * May be used as the port_start() entry in ata_port_operations.
4625 * Inherited from caller.
4628 int ata_port_start (struct ata_port
*ap
)
4630 struct device
*dev
= ap
->dev
;
4633 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4637 rc
= ata_pad_alloc(ap
, dev
);
4639 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4643 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4650 * ata_port_stop - Undo ata_port_start()
4651 * @ap: Port to shut down
4653 * Frees the PRD table.
4655 * May be used as the port_stop() entry in ata_port_operations.
4658 * Inherited from caller.
4661 void ata_port_stop (struct ata_port
*ap
)
4663 struct device
*dev
= ap
->dev
;
4665 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4666 ata_pad_free(ap
, dev
);
4669 void ata_host_stop (struct ata_host_set
*host_set
)
4671 if (host_set
->mmio_base
)
4672 iounmap(host_set
->mmio_base
);
4677 * ata_host_remove - Unregister SCSI host structure with upper layers
4678 * @ap: Port to unregister
4679 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4682 * Inherited from caller.
4685 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4687 struct Scsi_Host
*sh
= ap
->host
;
4692 scsi_remove_host(sh
);
4694 ap
->ops
->port_stop(ap
);
4698 * ata_host_init - Initialize an ata_port structure
4699 * @ap: Structure to initialize
4700 * @host: associated SCSI mid-layer structure
4701 * @host_set: Collection of hosts to which @ap belongs
4702 * @ent: Probe information provided by low-level driver
4703 * @port_no: Port number associated with this ata_port
4705 * Initialize a new ata_port structure, and its associated
4709 * Inherited from caller.
4712 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4713 struct ata_host_set
*host_set
,
4714 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4720 host
->max_channel
= 1;
4721 host
->unique_id
= ata_unique_id
++;
4722 host
->max_cmd_len
= 12;
4724 ap
->flags
= ATA_FLAG_DISABLED
;
4725 ap
->id
= host
->unique_id
;
4727 ap
->ctl
= ATA_DEVCTL_OBS
;
4728 ap
->host_set
= host_set
;
4730 ap
->port_no
= port_no
;
4732 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4733 ap
->pio_mask
= ent
->pio_mask
;
4734 ap
->mwdma_mask
= ent
->mwdma_mask
;
4735 ap
->udma_mask
= ent
->udma_mask
;
4736 ap
->flags
|= ent
->host_flags
;
4737 ap
->ops
= ent
->port_ops
;
4738 ap
->sata_spd_limit
= UINT_MAX
;
4739 ap
->active_tag
= ATA_TAG_POISON
;
4740 ap
->last_ctl
= 0xFF;
4742 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4743 INIT_LIST_HEAD(&ap
->eh_done_q
);
4745 /* set cable type */
4746 ap
->cbl
= ATA_CBL_NONE
;
4747 if (ap
->flags
& ATA_FLAG_SATA
)
4748 ap
->cbl
= ATA_CBL_SATA
;
4750 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4751 struct ata_device
*dev
= &ap
->device
[i
];
4753 dev
->pio_mask
= UINT_MAX
;
4754 dev
->mwdma_mask
= UINT_MAX
;
4755 dev
->udma_mask
= UINT_MAX
;
4759 ap
->stats
.unhandled_irq
= 1;
4760 ap
->stats
.idle_irq
= 1;
4763 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4767 * ata_host_add - Attach low-level ATA driver to system
4768 * @ent: Information provided by low-level driver
4769 * @host_set: Collections of ports to which we add
4770 * @port_no: Port number associated with this host
4772 * Attach low-level ATA driver to system.
4775 * PCI/etc. bus probe sem.
4778 * New ata_port on success, for NULL on error.
4781 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4782 struct ata_host_set
*host_set
,
4783 unsigned int port_no
)
4785 struct Scsi_Host
*host
;
4786 struct ata_port
*ap
;
4791 if (!ent
->port_ops
->probe_reset
&&
4792 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4793 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4798 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4802 host
->transportt
= &ata_scsi_transport_template
;
4804 ap
= ata_shost_to_port(host
);
4806 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4808 rc
= ap
->ops
->port_start(ap
);
4815 scsi_host_put(host
);
4820 * ata_device_add - Register hardware device with ATA and SCSI layers
4821 * @ent: Probe information describing hardware device to be registered
4823 * This function processes the information provided in the probe
4824 * information struct @ent, allocates the necessary ATA and SCSI
4825 * host information structures, initializes them, and registers
4826 * everything with requisite kernel subsystems.
4828 * This function requests irqs, probes the ATA bus, and probes
4832 * PCI/etc. bus probe sem.
4835 * Number of ports registered. Zero on error (no ports registered).
4838 int ata_device_add(const struct ata_probe_ent
*ent
)
4840 unsigned int count
= 0, i
;
4841 struct device
*dev
= ent
->dev
;
4842 struct ata_host_set
*host_set
;
4845 /* alloc a container for our list of ATA ports (buses) */
4846 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4847 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4850 spin_lock_init(&host_set
->lock
);
4852 host_set
->dev
= dev
;
4853 host_set
->n_ports
= ent
->n_ports
;
4854 host_set
->irq
= ent
->irq
;
4855 host_set
->mmio_base
= ent
->mmio_base
;
4856 host_set
->private_data
= ent
->private_data
;
4857 host_set
->ops
= ent
->port_ops
;
4858 host_set
->flags
= ent
->host_set_flags
;
4860 /* register each port bound to this device */
4861 for (i
= 0; i
< ent
->n_ports
; i
++) {
4862 struct ata_port
*ap
;
4863 unsigned long xfer_mode_mask
;
4865 ap
= ata_host_add(ent
, host_set
, i
);
4869 host_set
->ports
[i
] = ap
;
4870 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4871 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4872 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4874 /* print per-port info to dmesg */
4875 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4876 "bmdma 0x%lX irq %lu\n",
4878 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4879 ata_mode_string(xfer_mode_mask
),
4880 ap
->ioaddr
.cmd_addr
,
4881 ap
->ioaddr
.ctl_addr
,
4882 ap
->ioaddr
.bmdma_addr
,
4886 host_set
->ops
->irq_clear(ap
);
4893 /* obtain irq, that is shared between channels */
4894 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4895 DRV_NAME
, host_set
))
4898 /* perform each probe synchronously */
4899 DPRINTK("probe begin\n");
4900 for (i
= 0; i
< count
; i
++) {
4901 struct ata_port
*ap
;
4904 ap
= host_set
->ports
[i
];
4906 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4907 rc
= ata_bus_probe(ap
);
4908 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4911 /* FIXME: do something useful here?
4912 * Current libata behavior will
4913 * tear down everything when
4914 * the module is removed
4915 * or the h/w is unplugged.
4919 rc
= scsi_add_host(ap
->host
, dev
);
4921 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4923 /* FIXME: do something useful here */
4924 /* FIXME: handle unconditional calls to
4925 * scsi_scan_host and ata_host_remove, below,
4931 /* probes are done, now scan each port's disk(s) */
4932 DPRINTK("host probe begin\n");
4933 for (i
= 0; i
< count
; i
++) {
4934 struct ata_port
*ap
= host_set
->ports
[i
];
4936 ata_scsi_scan_host(ap
);
4939 dev_set_drvdata(dev
, host_set
);
4941 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4942 return ent
->n_ports
; /* success */
4945 for (i
= 0; i
< count
; i
++) {
4946 ata_host_remove(host_set
->ports
[i
], 1);
4947 scsi_host_put(host_set
->ports
[i
]->host
);
4951 VPRINTK("EXIT, returning 0\n");
4956 * ata_host_set_remove - PCI layer callback for device removal
4957 * @host_set: ATA host set that was removed
4959 * Unregister all objects associated with this host set. Free those
4963 * Inherited from calling layer (may sleep).
4966 void ata_host_set_remove(struct ata_host_set
*host_set
)
4968 struct ata_port
*ap
;
4971 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4972 ap
= host_set
->ports
[i
];
4973 scsi_remove_host(ap
->host
);
4976 free_irq(host_set
->irq
, host_set
);
4978 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4979 ap
= host_set
->ports
[i
];
4981 ata_scsi_release(ap
->host
);
4983 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4984 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4986 if (ioaddr
->cmd_addr
== 0x1f0)
4987 release_region(0x1f0, 8);
4988 else if (ioaddr
->cmd_addr
== 0x170)
4989 release_region(0x170, 8);
4992 scsi_host_put(ap
->host
);
4995 if (host_set
->ops
->host_stop
)
4996 host_set
->ops
->host_stop(host_set
);
5002 * ata_scsi_release - SCSI layer callback hook for host unload
5003 * @host: libata host to be unloaded
5005 * Performs all duties necessary to shut down a libata port...
5006 * Kill port kthread, disable port, and release resources.
5009 * Inherited from SCSI layer.
5015 int ata_scsi_release(struct Scsi_Host
*host
)
5017 struct ata_port
*ap
= ata_shost_to_port(host
);
5021 ap
->ops
->port_disable(ap
);
5022 ata_host_remove(ap
, 0);
5029 * ata_std_ports - initialize ioaddr with standard port offsets.
5030 * @ioaddr: IO address structure to be initialized
5032 * Utility function which initializes data_addr, error_addr,
5033 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5034 * device_addr, status_addr, and command_addr to standard offsets
5035 * relative to cmd_addr.
5037 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5040 void ata_std_ports(struct ata_ioports
*ioaddr
)
5042 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5043 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5044 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5045 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5046 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5047 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5048 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5049 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5050 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5051 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5057 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5059 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5061 pci_iounmap(pdev
, host_set
->mmio_base
);
5065 * ata_pci_remove_one - PCI layer callback for device removal
5066 * @pdev: PCI device that was removed
5068 * PCI layer indicates to libata via this hook that
5069 * hot-unplug or module unload event has occurred.
5070 * Handle this by unregistering all objects associated
5071 * with this PCI device. Free those objects. Then finally
5072 * release PCI resources and disable device.
5075 * Inherited from PCI layer (may sleep).
5078 void ata_pci_remove_one (struct pci_dev
*pdev
)
5080 struct device
*dev
= pci_dev_to_dev(pdev
);
5081 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5083 ata_host_set_remove(host_set
);
5084 pci_release_regions(pdev
);
5085 pci_disable_device(pdev
);
5086 dev_set_drvdata(dev
, NULL
);
5089 /* move to PCI subsystem */
5090 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5092 unsigned long tmp
= 0;
5094 switch (bits
->width
) {
5097 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5103 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5109 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5120 return (tmp
== bits
->val
) ? 1 : 0;
5123 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5125 pci_save_state(pdev
);
5126 pci_disable_device(pdev
);
5127 pci_set_power_state(pdev
, PCI_D3hot
);
5131 int ata_pci_device_resume(struct pci_dev
*pdev
)
5133 pci_set_power_state(pdev
, PCI_D0
);
5134 pci_restore_state(pdev
);
5135 pci_enable_device(pdev
);
5136 pci_set_master(pdev
);
5139 #endif /* CONFIG_PCI */
5142 static int __init
ata_init(void)
5144 ata_wq
= create_workqueue("ata");
5148 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5152 static void __exit
ata_exit(void)
5154 destroy_workqueue(ata_wq
);
5157 module_init(ata_init
);
5158 module_exit(ata_exit
);
5160 static unsigned long ratelimit_time
;
5161 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5163 int ata_ratelimit(void)
5166 unsigned long flags
;
5168 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5170 if (time_after(jiffies
, ratelimit_time
)) {
5172 ratelimit_time
= jiffies
+ (HZ
/5);
5176 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5182 * ata_wait_register - wait until register value changes
5183 * @reg: IO-mapped register
5184 * @mask: Mask to apply to read register value
5185 * @val: Wait condition
5186 * @interval_msec: polling interval in milliseconds
5187 * @timeout_msec: timeout in milliseconds
5189 * Waiting for some bits of register to change is a common
5190 * operation for ATA controllers. This function reads 32bit LE
5191 * IO-mapped register @reg and tests for the following condition.
5193 * (*@reg & mask) != val
5195 * If the condition is met, it returns; otherwise, the process is
5196 * repeated after @interval_msec until timeout.
5199 * Kernel thread context (may sleep)
5202 * The final register value.
5204 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5205 unsigned long interval_msec
,
5206 unsigned long timeout_msec
)
5208 unsigned long timeout
;
5211 tmp
= ioread32(reg
);
5213 /* Calculate timeout _after_ the first read to make sure
5214 * preceding writes reach the controller before starting to
5215 * eat away the timeout.
5217 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5219 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5220 msleep(interval_msec
);
5221 tmp
= ioread32(reg
);
5228 * libata is essentially a library of internal helper functions for
5229 * low-level ATA host controller drivers. As such, the API/ABI is
5230 * likely to change as new drivers are added and updated.
5231 * Do not depend on ABI/API stability.
5234 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5235 EXPORT_SYMBOL_GPL(ata_std_ports
);
5236 EXPORT_SYMBOL_GPL(ata_device_add
);
5237 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5238 EXPORT_SYMBOL_GPL(ata_sg_init
);
5239 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5240 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5241 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5242 EXPORT_SYMBOL_GPL(ata_tf_load
);
5243 EXPORT_SYMBOL_GPL(ata_tf_read
);
5244 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5245 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5246 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5247 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5248 EXPORT_SYMBOL_GPL(ata_check_status
);
5249 EXPORT_SYMBOL_GPL(ata_altstatus
);
5250 EXPORT_SYMBOL_GPL(ata_exec_command
);
5251 EXPORT_SYMBOL_GPL(ata_port_start
);
5252 EXPORT_SYMBOL_GPL(ata_port_stop
);
5253 EXPORT_SYMBOL_GPL(ata_host_stop
);
5254 EXPORT_SYMBOL_GPL(ata_interrupt
);
5255 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5256 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5257 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5258 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5259 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5260 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5261 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5262 EXPORT_SYMBOL_GPL(ata_port_probe
);
5263 EXPORT_SYMBOL_GPL(sata_set_spd
);
5264 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5265 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5266 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5267 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5268 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5269 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5270 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5271 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5272 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5273 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5274 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5275 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5276 EXPORT_SYMBOL_GPL(ata_port_disable
);
5277 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5278 EXPORT_SYMBOL_GPL(ata_wait_register
);
5279 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5280 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5281 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5282 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5283 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5284 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5285 EXPORT_SYMBOL_GPL(ata_host_intr
);
5286 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5287 EXPORT_SYMBOL_GPL(sata_scr_read
);
5288 EXPORT_SYMBOL_GPL(sata_scr_write
);
5289 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5290 EXPORT_SYMBOL_GPL(ata_port_online
);
5291 EXPORT_SYMBOL_GPL(ata_port_offline
);
5292 EXPORT_SYMBOL_GPL(ata_id_string
);
5293 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5294 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5296 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5297 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5298 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5301 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5302 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5303 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5304 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5305 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5306 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5307 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5308 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5309 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5310 #endif /* CONFIG_PCI */
5312 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5313 EXPORT_SYMBOL_GPL(ata_device_resume
);
5314 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5315 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5317 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5318 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5319 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);