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 int ata_down_sata_spd_limit(struct ata_port
*ap
);
69 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
);
70 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
71 struct ata_device
*dev
);
72 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 int atapi_enabled
= 1;
78 module_param(atapi_enabled
, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 module_param_named(fua
, libata_fua
, int, 0444);
83 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
85 MODULE_AUTHOR("Jeff Garzik");
86 MODULE_DESCRIPTION("Library module for ATA devices");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION
);
92 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
93 * @tf: Taskfile to convert
94 * @fis: Buffer into which data will output
95 * @pmp: Port multiplier port
97 * Converts a standard ATA taskfile to a Serial ATA
98 * FIS structure (Register - Host to Device).
101 * Inherited from caller.
104 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
106 fis
[0] = 0x27; /* Register - Host to Device FIS */
107 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
108 bit 7 indicates Command FIS */
109 fis
[2] = tf
->command
;
110 fis
[3] = tf
->feature
;
117 fis
[8] = tf
->hob_lbal
;
118 fis
[9] = tf
->hob_lbam
;
119 fis
[10] = tf
->hob_lbah
;
120 fis
[11] = tf
->hob_feature
;
123 fis
[13] = tf
->hob_nsect
;
134 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
135 * @fis: Buffer from which data will be input
136 * @tf: Taskfile to output
138 * Converts a serial ATA FIS structure to a standard ATA taskfile.
141 * Inherited from caller.
144 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
146 tf
->command
= fis
[2]; /* status */
147 tf
->feature
= fis
[3]; /* error */
154 tf
->hob_lbal
= fis
[8];
155 tf
->hob_lbam
= fis
[9];
156 tf
->hob_lbah
= fis
[10];
159 tf
->hob_nsect
= fis
[13];
162 static const u8 ata_rw_cmds
[] = {
166 ATA_CMD_READ_MULTI_EXT
,
167 ATA_CMD_WRITE_MULTI_EXT
,
171 ATA_CMD_WRITE_MULTI_FUA_EXT
,
175 ATA_CMD_PIO_READ_EXT
,
176 ATA_CMD_PIO_WRITE_EXT
,
189 ATA_CMD_WRITE_FUA_EXT
193 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
194 * @qc: command to examine and configure
196 * Examine the device configuration and tf->flags to calculate
197 * the proper read/write commands and protocol to use.
202 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
204 struct ata_taskfile
*tf
= &qc
->tf
;
205 struct ata_device
*dev
= qc
->dev
;
208 int index
, fua
, lba48
, write
;
210 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
211 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
212 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
214 if (dev
->flags
& ATA_DFLAG_PIO
) {
215 tf
->protocol
= ATA_PROT_PIO
;
216 index
= dev
->multi_count
? 0 : 8;
217 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
218 /* Unable to use DMA due to host limitation */
219 tf
->protocol
= ATA_PROT_PIO
;
220 index
= dev
->multi_count
? 0 : 8;
222 tf
->protocol
= ATA_PROT_DMA
;
226 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
235 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
236 * @pio_mask: pio_mask
237 * @mwdma_mask: mwdma_mask
238 * @udma_mask: udma_mask
240 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
241 * unsigned int xfer_mask.
249 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
250 unsigned int mwdma_mask
,
251 unsigned int udma_mask
)
253 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
254 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
255 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
259 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
260 * @xfer_mask: xfer_mask to unpack
261 * @pio_mask: resulting pio_mask
262 * @mwdma_mask: resulting mwdma_mask
263 * @udma_mask: resulting udma_mask
265 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
266 * Any NULL distination masks will be ignored.
268 static void ata_unpack_xfermask(unsigned int xfer_mask
,
269 unsigned int *pio_mask
,
270 unsigned int *mwdma_mask
,
271 unsigned int *udma_mask
)
274 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
276 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
278 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
281 static const struct ata_xfer_ent
{
285 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
286 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
287 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
292 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
293 * @xfer_mask: xfer_mask of interest
295 * Return matching XFER_* value for @xfer_mask. Only the highest
296 * bit of @xfer_mask is considered.
302 * Matching XFER_* value, 0 if no match found.
304 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
306 int highbit
= fls(xfer_mask
) - 1;
307 const struct ata_xfer_ent
*ent
;
309 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
310 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
311 return ent
->base
+ highbit
- ent
->shift
;
316 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
317 * @xfer_mode: XFER_* of interest
319 * Return matching xfer_mask for @xfer_mode.
325 * Matching xfer_mask, 0 if no match found.
327 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
329 const struct ata_xfer_ent
*ent
;
331 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
332 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
333 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
338 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
339 * @xfer_mode: XFER_* of interest
341 * Return matching xfer_shift for @xfer_mode.
347 * Matching xfer_shift, -1 if no match found.
349 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
351 const struct ata_xfer_ent
*ent
;
353 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
354 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
360 * ata_mode_string - convert xfer_mask to string
361 * @xfer_mask: mask of bits supported; only highest bit counts.
363 * Determine string which represents the highest speed
364 * (highest bit in @modemask).
370 * Constant C string representing highest speed listed in
371 * @mode_mask, or the constant C string "<n/a>".
373 static const char *ata_mode_string(unsigned int xfer_mask
)
375 static const char * const xfer_mode_str
[] = {
395 highbit
= fls(xfer_mask
) - 1;
396 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
397 return xfer_mode_str
[highbit
];
401 static const char *sata_spd_string(unsigned int spd
)
403 static const char * const spd_str
[] = {
408 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
410 return spd_str
[spd
- 1];
413 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
415 if (ata_dev_enabled(dev
)) {
416 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
423 * ata_pio_devchk - PATA device presence detection
424 * @ap: ATA channel to examine
425 * @device: Device to examine (starting at zero)
427 * This technique was originally described in
428 * Hale Landis's ATADRVR (www.ata-atapi.com), and
429 * later found its way into the ATA/ATAPI spec.
431 * Write a pattern to the ATA shadow registers,
432 * and if a device is present, it will respond by
433 * correctly storing and echoing back the
434 * ATA shadow register contents.
440 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
443 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
446 ap
->ops
->dev_select(ap
, device
);
448 outb(0x55, ioaddr
->nsect_addr
);
449 outb(0xaa, ioaddr
->lbal_addr
);
451 outb(0xaa, ioaddr
->nsect_addr
);
452 outb(0x55, ioaddr
->lbal_addr
);
454 outb(0x55, ioaddr
->nsect_addr
);
455 outb(0xaa, ioaddr
->lbal_addr
);
457 nsect
= inb(ioaddr
->nsect_addr
);
458 lbal
= inb(ioaddr
->lbal_addr
);
460 if ((nsect
== 0x55) && (lbal
== 0xaa))
461 return 1; /* we found a device */
463 return 0; /* nothing found */
467 * ata_mmio_devchk - PATA device presence detection
468 * @ap: ATA channel to examine
469 * @device: Device to examine (starting at zero)
471 * This technique was originally described in
472 * Hale Landis's ATADRVR (www.ata-atapi.com), and
473 * later found its way into the ATA/ATAPI spec.
475 * Write a pattern to the ATA shadow registers,
476 * and if a device is present, it will respond by
477 * correctly storing and echoing back the
478 * ATA shadow register contents.
484 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
487 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
490 ap
->ops
->dev_select(ap
, device
);
492 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
493 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
495 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
496 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
498 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
499 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
501 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
502 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
504 if ((nsect
== 0x55) && (lbal
== 0xaa))
505 return 1; /* we found a device */
507 return 0; /* nothing found */
511 * ata_devchk - PATA device presence detection
512 * @ap: ATA channel to examine
513 * @device: Device to examine (starting at zero)
515 * Dispatch ATA device presence detection, depending
516 * on whether we are using PIO or MMIO to talk to the
517 * ATA shadow registers.
523 static unsigned int ata_devchk(struct ata_port
*ap
,
526 if (ap
->flags
& ATA_FLAG_MMIO
)
527 return ata_mmio_devchk(ap
, device
);
528 return ata_pio_devchk(ap
, device
);
532 * ata_dev_classify - determine device type based on ATA-spec signature
533 * @tf: ATA taskfile register set for device to be identified
535 * Determine from taskfile register contents whether a device is
536 * ATA or ATAPI, as per "Signature and persistence" section
537 * of ATA/PI spec (volume 1, sect 5.14).
543 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
544 * the event of failure.
547 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
549 /* Apple's open source Darwin code hints that some devices only
550 * put a proper signature into the LBA mid/high registers,
551 * So, we only check those. It's sufficient for uniqueness.
554 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
555 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
556 DPRINTK("found ATA device by sig\n");
560 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
561 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
562 DPRINTK("found ATAPI device by sig\n");
563 return ATA_DEV_ATAPI
;
566 DPRINTK("unknown device\n");
567 return ATA_DEV_UNKNOWN
;
571 * ata_dev_try_classify - Parse returned ATA device signature
572 * @ap: ATA channel to examine
573 * @device: Device to examine (starting at zero)
574 * @r_err: Value of error register on completion
576 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
577 * an ATA/ATAPI-defined set of values is placed in the ATA
578 * shadow registers, indicating the results of device detection
581 * Select the ATA device, and read the values from the ATA shadow
582 * registers. Then parse according to the Error register value,
583 * and the spec-defined values examined by ata_dev_classify().
589 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
593 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
595 struct ata_taskfile tf
;
599 ap
->ops
->dev_select(ap
, device
);
601 memset(&tf
, 0, sizeof(tf
));
603 ap
->ops
->tf_read(ap
, &tf
);
608 /* see if device passed diags */
611 else if ((device
== 0) && (err
== 0x81))
616 /* determine if device is ATA or ATAPI */
617 class = ata_dev_classify(&tf
);
619 if (class == ATA_DEV_UNKNOWN
)
621 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
627 * ata_id_string - Convert IDENTIFY DEVICE page into string
628 * @id: IDENTIFY DEVICE results we will examine
629 * @s: string into which data is output
630 * @ofs: offset into identify device page
631 * @len: length of string to return. must be an even number.
633 * The strings in the IDENTIFY DEVICE page are broken up into
634 * 16-bit chunks. Run through the string, and output each
635 * 8-bit chunk linearly, regardless of platform.
641 void ata_id_string(const u16
*id
, unsigned char *s
,
642 unsigned int ofs
, unsigned int len
)
661 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
662 * @id: IDENTIFY DEVICE results we will examine
663 * @s: string into which data is output
664 * @ofs: offset into identify device page
665 * @len: length of string to return. must be an odd number.
667 * This function is identical to ata_id_string except that it
668 * trims trailing spaces and terminates the resulting string with
669 * null. @len must be actual maximum length (even number) + 1.
674 void ata_id_c_string(const u16
*id
, unsigned char *s
,
675 unsigned int ofs
, unsigned int len
)
681 ata_id_string(id
, s
, ofs
, len
- 1);
683 p
= s
+ strnlen(s
, len
- 1);
684 while (p
> s
&& p
[-1] == ' ')
689 static u64
ata_id_n_sectors(const u16
*id
)
691 if (ata_id_has_lba(id
)) {
692 if (ata_id_has_lba48(id
))
693 return ata_id_u64(id
, 100);
695 return ata_id_u32(id
, 60);
697 if (ata_id_current_chs_valid(id
))
698 return ata_id_u32(id
, 57);
700 return id
[1] * id
[3] * id
[6];
705 * ata_noop_dev_select - Select device 0/1 on ATA bus
706 * @ap: ATA channel to manipulate
707 * @device: ATA device (numbered from zero) to select
709 * This function performs no actual function.
711 * May be used as the dev_select() entry in ata_port_operations.
716 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
722 * ata_std_dev_select - Select device 0/1 on ATA bus
723 * @ap: ATA channel to manipulate
724 * @device: ATA device (numbered from zero) to select
726 * Use the method defined in the ATA specification to
727 * make either device 0, or device 1, active on the
728 * ATA channel. Works with both PIO and MMIO.
730 * May be used as the dev_select() entry in ata_port_operations.
736 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
741 tmp
= ATA_DEVICE_OBS
;
743 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
745 if (ap
->flags
& ATA_FLAG_MMIO
) {
746 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
748 outb(tmp
, ap
->ioaddr
.device_addr
);
750 ata_pause(ap
); /* needed; also flushes, for mmio */
754 * ata_dev_select - Select device 0/1 on ATA bus
755 * @ap: ATA channel to manipulate
756 * @device: ATA device (numbered from zero) to select
757 * @wait: non-zero to wait for Status register BSY bit to clear
758 * @can_sleep: non-zero if context allows sleeping
760 * Use the method defined in the ATA specification to
761 * make either device 0, or device 1, active on the
764 * This is a high-level version of ata_std_dev_select(),
765 * which additionally provides the services of inserting
766 * the proper pauses and status polling, where needed.
772 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
773 unsigned int wait
, unsigned int can_sleep
)
775 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
776 ap
->id
, device
, wait
);
781 ap
->ops
->dev_select(ap
, device
);
784 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
791 * ata_dump_id - IDENTIFY DEVICE info debugging output
792 * @id: IDENTIFY DEVICE page to dump
794 * Dump selected 16-bit words from the given IDENTIFY DEVICE
801 static inline void ata_dump_id(const u16
*id
)
803 DPRINTK("49==0x%04x "
813 DPRINTK("80==0x%04x "
823 DPRINTK("88==0x%04x "
830 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
831 * @id: IDENTIFY data to compute xfer mask from
833 * Compute the xfermask for this device. This is not as trivial
834 * as it seems if we must consider early devices correctly.
836 * FIXME: pre IDE drive timing (do we care ?).
844 static unsigned int ata_id_xfermask(const u16
*id
)
846 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
848 /* Usual case. Word 53 indicates word 64 is valid */
849 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
850 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
854 /* If word 64 isn't valid then Word 51 high byte holds
855 * the PIO timing number for the maximum. Turn it into
858 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
860 /* But wait.. there's more. Design your standards by
861 * committee and you too can get a free iordy field to
862 * process. However its the speeds not the modes that
863 * are supported... Note drivers using the timing API
864 * will get this right anyway
868 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
871 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
872 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
874 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
878 * ata_port_queue_task - Queue port_task
879 * @ap: The ata_port to queue port_task for
881 * Schedule @fn(@data) for execution after @delay jiffies using
882 * port_task. There is one port_task per port and it's the
883 * user(low level driver)'s responsibility to make sure that only
884 * one task is active at any given time.
886 * libata core layer takes care of synchronization between
887 * port_task and EH. ata_port_queue_task() may be ignored for EH
891 * Inherited from caller.
893 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
898 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
901 PREPARE_WORK(&ap
->port_task
, fn
, data
);
904 rc
= queue_work(ata_wq
, &ap
->port_task
);
906 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
908 /* rc == 0 means that another user is using port task */
913 * ata_port_flush_task - Flush port_task
914 * @ap: The ata_port to flush port_task for
916 * After this function completes, port_task is guranteed not to
917 * be running or scheduled.
920 * Kernel thread context (may sleep)
922 void ata_port_flush_task(struct ata_port
*ap
)
928 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
929 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
930 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
932 DPRINTK("flush #1\n");
933 flush_workqueue(ata_wq
);
936 * At this point, if a task is running, it's guaranteed to see
937 * the FLUSH flag; thus, it will never queue pio tasks again.
940 if (!cancel_delayed_work(&ap
->port_task
)) {
941 DPRINTK("flush #2\n");
942 flush_workqueue(ata_wq
);
945 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
946 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
947 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
952 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
954 struct completion
*waiting
= qc
->private_data
;
956 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
961 * ata_exec_internal - execute libata internal command
962 * @ap: Port to which the command is sent
963 * @dev: Device to which the command is sent
964 * @tf: Taskfile registers for the command and the result
965 * @dma_dir: Data tranfer direction of the command
966 * @buf: Data buffer of the command
967 * @buflen: Length of data buffer
969 * Executes libata internal command with timeout. @tf contains
970 * command on entry and result on return. Timeout and error
971 * conditions are reported via return value. No recovery action
972 * is taken after a command times out. It's caller's duty to
973 * clean up after timeout.
976 * None. Should be called with kernel context, might sleep.
980 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
981 struct ata_taskfile
*tf
,
982 int dma_dir
, void *buf
, unsigned int buflen
)
984 u8 command
= tf
->command
;
985 struct ata_queued_cmd
*qc
;
986 DECLARE_COMPLETION(wait
);
988 unsigned int err_mask
;
990 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
992 qc
= ata_qc_new_init(ap
, dev
);
996 qc
->dma_dir
= dma_dir
;
997 if (dma_dir
!= DMA_NONE
) {
998 ata_sg_init_one(qc
, buf
, buflen
);
999 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1002 qc
->private_data
= &wait
;
1003 qc
->complete_fn
= ata_qc_complete_internal
;
1007 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1009 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1010 ata_port_flush_task(ap
);
1012 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1014 /* We're racing with irq here. If we lose, the
1015 * following test prevents us from completing the qc
1016 * again. If completion irq occurs after here but
1017 * before the caller cleans up, it will result in a
1018 * spurious interrupt. We can live with that.
1020 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1021 qc
->err_mask
= AC_ERR_TIMEOUT
;
1022 ata_qc_complete(qc
);
1023 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1027 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1031 err_mask
= qc
->err_mask
;
1035 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1036 * Until those drivers are fixed, we detect the condition
1037 * here, fail the command with AC_ERR_SYSTEM and reenable the
1040 * Note that this doesn't change any behavior as internal
1041 * command failure results in disabling the device in the
1042 * higher layer for LLDDs without new reset/EH callbacks.
1044 * Kill the following code as soon as those drivers are fixed.
1046 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1047 err_mask
|= AC_ERR_SYSTEM
;
1055 * ata_pio_need_iordy - check if iordy needed
1058 * Check if the current speed of the device requires IORDY. Used
1059 * by various controllers for chip configuration.
1062 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1065 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1072 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1074 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1075 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1076 /* Is the speed faster than the drive allows non IORDY ? */
1078 /* This is cycle times not frequency - watch the logic! */
1079 if (pio
> 240) /* PIO2 is 240nS per cycle */
1088 * ata_dev_read_id - Read ID data from the specified device
1089 * @ap: port on which target device resides
1090 * @dev: target device
1091 * @p_class: pointer to class of the target device (may be changed)
1092 * @post_reset: is this read ID post-reset?
1093 * @p_id: read IDENTIFY page (newly allocated)
1095 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1096 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1097 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1098 * for pre-ATA4 drives.
1101 * Kernel thread context (may sleep)
1104 * 0 on success, -errno otherwise.
1106 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1107 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1109 unsigned int class = *p_class
;
1110 struct ata_taskfile tf
;
1111 unsigned int err_mask
= 0;
1116 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1118 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1120 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1123 reason
= "out of memory";
1128 ata_tf_init(ap
, &tf
, dev
->devno
);
1132 tf
.command
= ATA_CMD_ID_ATA
;
1135 tf
.command
= ATA_CMD_ID_ATAPI
;
1139 reason
= "unsupported class";
1143 tf
.protocol
= ATA_PROT_PIO
;
1145 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1146 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1149 reason
= "I/O error";
1153 swap_buf_le16(id
, ATA_ID_WORDS
);
1156 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1158 reason
= "device reports illegal type";
1162 if (post_reset
&& class == ATA_DEV_ATA
) {
1164 * The exact sequence expected by certain pre-ATA4 drives is:
1167 * INITIALIZE DEVICE PARAMETERS
1169 * Some drives were very specific about that exact sequence.
1171 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1172 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1175 reason
= "INIT_DEV_PARAMS failed";
1179 /* current CHS translation info (id[53-58]) might be
1180 * changed. reread the identify device info.
1192 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1193 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 */
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 i
, rc
, found
= 0;
1372 struct ata_device
*dev
;
1376 /* reset and determine device classes */
1377 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1378 classes
[i
] = ATA_DEV_UNKNOWN
;
1380 if (ap
->ops
->probe_reset
) {
1381 rc
= ap
->ops
->probe_reset(ap
, classes
);
1383 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1387 ap
->ops
->phy_reset(ap
);
1389 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1390 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1391 classes
[i
] = ap
->device
[i
].class;
1396 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1397 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1398 classes
[i
] = ATA_DEV_NONE
;
1400 /* read IDENTIFY page and configure devices */
1401 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1402 dev
= &ap
->device
[i
];
1403 dev
->class = classes
[i
];
1405 if (!ata_dev_enabled(dev
))
1408 WARN_ON(dev
->id
!= NULL
);
1409 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1410 dev
->class = ATA_DEV_NONE
;
1414 if (ata_dev_configure(ap
, dev
, 1)) {
1415 ata_dev_disable(ap
, dev
);
1422 /* configure transfer mode */
1423 if (ap
->ops
->set_mode
) {
1424 /* FIXME: make ->set_mode handle no device case and
1425 * return error code and failing device on failure as
1426 * ata_set_mode() does.
1429 ap
->ops
->set_mode(ap
);
1432 while (ata_set_mode(ap
, &dev
))
1433 ata_dev_disable(ap
, dev
);
1436 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1437 if (ata_dev_enabled(&ap
->device
[i
]))
1440 /* no device present, disable port */
1441 ata_port_disable(ap
);
1442 ap
->ops
->port_disable(ap
);
1447 * ata_port_probe - Mark port as enabled
1448 * @ap: Port for which we indicate enablement
1450 * Modify @ap data structure such that the system
1451 * thinks that the entire port is enabled.
1453 * LOCKING: host_set lock, or some other form of
1457 void ata_port_probe(struct ata_port
*ap
)
1459 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1463 * sata_print_link_status - Print SATA link status
1464 * @ap: SATA port to printk link status about
1466 * This function prints link speed and status of a SATA link.
1471 static void sata_print_link_status(struct ata_port
*ap
)
1475 if (!ap
->ops
->scr_read
)
1478 sstatus
= scr_read(ap
, SCR_STATUS
);
1480 if (sata_dev_present(ap
)) {
1481 tmp
= (sstatus
>> 4) & 0xf;
1482 printk(KERN_INFO
"ata%u: SATA link up %s (SStatus %X)\n",
1483 ap
->id
, sata_spd_string(tmp
), sstatus
);
1485 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1491 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1492 * @ap: SATA port associated with target SATA PHY.
1494 * This function issues commands to standard SATA Sxxx
1495 * PHY registers, to wake up the phy (and device), and
1496 * clear any reset condition.
1499 * PCI/etc. bus probe sem.
1502 void __sata_phy_reset(struct ata_port
*ap
)
1505 unsigned long timeout
= jiffies
+ (HZ
* 5);
1507 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1508 /* issue phy wake/reset */
1509 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1510 /* Couldn't find anything in SATA I/II specs, but
1511 * AHCI-1.1 10.4.2 says at least 1 ms. */
1514 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1516 /* wait for phy to become ready, if necessary */
1519 sstatus
= scr_read(ap
, SCR_STATUS
);
1520 if ((sstatus
& 0xf) != 1)
1522 } while (time_before(jiffies
, timeout
));
1524 /* print link status */
1525 sata_print_link_status(ap
);
1527 /* TODO: phy layer with polling, timeouts, etc. */
1528 if (sata_dev_present(ap
))
1531 ata_port_disable(ap
);
1533 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1536 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1537 ata_port_disable(ap
);
1541 ap
->cbl
= ATA_CBL_SATA
;
1545 * sata_phy_reset - Reset SATA bus.
1546 * @ap: SATA port associated with target SATA PHY.
1548 * This function resets the SATA bus, and then probes
1549 * the bus for devices.
1552 * PCI/etc. bus probe sem.
1555 void sata_phy_reset(struct ata_port
*ap
)
1557 __sata_phy_reset(ap
);
1558 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1564 * ata_dev_pair - return other device on cable
1568 * Obtain the other device on the same cable, or if none is
1569 * present NULL is returned
1572 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1574 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1575 if (!ata_dev_enabled(pair
))
1581 * ata_port_disable - Disable port.
1582 * @ap: Port to be disabled.
1584 * Modify @ap data structure such that the system
1585 * thinks that the entire port is disabled, and should
1586 * never attempt to probe or communicate with devices
1589 * LOCKING: host_set lock, or some other form of
1593 void ata_port_disable(struct ata_port
*ap
)
1595 ap
->device
[0].class = ATA_DEV_NONE
;
1596 ap
->device
[1].class = ATA_DEV_NONE
;
1597 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1601 * ata_down_sata_spd_limit - adjust SATA spd limit downward
1602 * @ap: Port to adjust SATA spd limit for
1604 * Adjust SATA spd limit of @ap downward. Note that this
1605 * function only adjusts the limit. The change must be applied
1606 * using ata_set_sata_spd().
1609 * Inherited from caller.
1612 * 0 on success, negative errno on failure
1614 static int ata_down_sata_spd_limit(struct ata_port
*ap
)
1619 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1622 mask
= ap
->sata_spd_limit
;
1625 highbit
= fls(mask
) - 1;
1626 mask
&= ~(1 << highbit
);
1628 spd
= (scr_read(ap
, SCR_STATUS
) >> 4) & 0xf;
1632 mask
&= (1 << spd
) - 1;
1636 ap
->sata_spd_limit
= mask
;
1638 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1639 ap
->id
, sata_spd_string(fls(mask
)));
1644 static int __ata_set_sata_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1648 if (ap
->sata_spd_limit
== UINT_MAX
)
1651 limit
= fls(ap
->sata_spd_limit
);
1653 spd
= (*scontrol
>> 4) & 0xf;
1654 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1656 return spd
!= limit
;
1660 * ata_set_sata_spd_needed - is SATA spd configuration needed
1661 * @ap: Port in question
1663 * Test whether the spd limit in SControl matches
1664 * @ap->sata_spd_limit. This function is used to determine
1665 * whether hardreset is necessary to apply SATA spd
1669 * Inherited from caller.
1672 * 1 if SATA spd configuration is needed, 0 otherwise.
1674 static int ata_set_sata_spd_needed(struct ata_port
*ap
)
1678 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1681 scontrol
= scr_read(ap
, SCR_CONTROL
);
1683 return __ata_set_sata_spd_needed(ap
, &scontrol
);
1687 * ata_set_sata_spd - set SATA spd according to spd limit
1688 * @ap: Port to set SATA spd for
1690 * Set SATA spd of @ap according to sata_spd_limit.
1693 * Inherited from caller.
1696 * 0 if spd doesn't need to be changed, 1 if spd has been
1697 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1699 static int ata_set_sata_spd(struct ata_port
*ap
)
1703 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1706 scontrol
= scr_read(ap
, SCR_CONTROL
);
1707 if (!__ata_set_sata_spd_needed(ap
, &scontrol
))
1710 scr_write(ap
, SCR_CONTROL
, scontrol
);
1715 * This mode timing computation functionality is ported over from
1716 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1719 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1720 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1721 * for PIO 5, which is a nonstandard extension and UDMA6, which
1722 * is currently supported only by Maxtor drives.
1725 static const struct ata_timing ata_timing
[] = {
1727 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1728 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1729 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1730 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1732 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1733 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1734 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1736 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1738 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1739 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1740 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1742 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1743 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1744 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1746 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1747 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1748 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1750 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1751 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1752 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1754 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1759 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1760 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1762 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1764 q
->setup
= EZ(t
->setup
* 1000, T
);
1765 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1766 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1767 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1768 q
->active
= EZ(t
->active
* 1000, T
);
1769 q
->recover
= EZ(t
->recover
* 1000, T
);
1770 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1771 q
->udma
= EZ(t
->udma
* 1000, UT
);
1774 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1775 struct ata_timing
*m
, unsigned int what
)
1777 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1778 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1779 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1780 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1781 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1782 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1783 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1784 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1787 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1789 const struct ata_timing
*t
;
1791 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1792 if (t
->mode
== 0xFF)
1797 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1798 struct ata_timing
*t
, int T
, int UT
)
1800 const struct ata_timing
*s
;
1801 struct ata_timing p
;
1807 if (!(s
= ata_timing_find_mode(speed
)))
1810 memcpy(t
, s
, sizeof(*s
));
1813 * If the drive is an EIDE drive, it can tell us it needs extended
1814 * PIO/MW_DMA cycle timing.
1817 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1818 memset(&p
, 0, sizeof(p
));
1819 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1820 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1821 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1822 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1823 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1825 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1829 * Convert the timing to bus clock counts.
1832 ata_timing_quantize(t
, t
, T
, UT
);
1835 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1836 * S.M.A.R.T * and some other commands. We have to ensure that the
1837 * DMA cycle timing is slower/equal than the fastest PIO timing.
1840 if (speed
> XFER_PIO_4
) {
1841 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1842 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1846 * Lengthen active & recovery time so that cycle time is correct.
1849 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1850 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1851 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1854 if (t
->active
+ t
->recover
< t
->cycle
) {
1855 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1856 t
->recover
= t
->cycle
- t
->active
;
1862 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1864 unsigned int err_mask
;
1867 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1868 dev
->flags
|= ATA_DFLAG_PIO
;
1870 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1873 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1878 rc
= ata_dev_revalidate(ap
, dev
, 0);
1881 "ata%u: failed to revalidate after set xfermode\n",
1886 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1887 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1889 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1891 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1896 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1897 * @ap: port on which timings will be programmed
1898 * @r_failed_dev: out paramter for failed device
1900 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1901 * ata_set_mode() fails, pointer to the failing device is
1902 * returned in @r_failed_dev.
1905 * PCI/etc. bus probe sem.
1908 * 0 on success, negative errno otherwise
1910 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1912 struct ata_device
*dev
;
1913 int i
, rc
= 0, used_dma
= 0, found
= 0;
1915 /* step 1: calculate xfer_mask */
1916 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1917 unsigned int pio_mask
, dma_mask
;
1919 dev
= &ap
->device
[i
];
1921 if (!ata_dev_enabled(dev
))
1924 ata_dev_xfermask(ap
, dev
);
1926 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
1927 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
1928 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
1929 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
1938 /* step 2: always set host PIO timings */
1939 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1940 dev
= &ap
->device
[i
];
1941 if (!ata_dev_enabled(dev
))
1944 if (!dev
->pio_mode
) {
1945 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
1946 ap
->id
, dev
->devno
);
1951 dev
->xfer_mode
= dev
->pio_mode
;
1952 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1953 if (ap
->ops
->set_piomode
)
1954 ap
->ops
->set_piomode(ap
, dev
);
1957 /* step 3: set host DMA timings */
1958 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1959 dev
= &ap
->device
[i
];
1961 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
1964 dev
->xfer_mode
= dev
->dma_mode
;
1965 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1966 if (ap
->ops
->set_dmamode
)
1967 ap
->ops
->set_dmamode(ap
, dev
);
1970 /* step 4: update devices' xfer mode */
1971 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1972 dev
= &ap
->device
[i
];
1974 if (!ata_dev_enabled(dev
))
1977 rc
= ata_dev_set_mode(ap
, dev
);
1982 /* Record simplex status. If we selected DMA then the other
1983 * host channels are not permitted to do so.
1985 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
1986 ap
->host_set
->simplex_claimed
= 1;
1988 /* step5: chip specific finalisation */
1989 if (ap
->ops
->post_set_mode
)
1990 ap
->ops
->post_set_mode(ap
);
1994 *r_failed_dev
= dev
;
1999 * ata_tf_to_host - issue ATA taskfile to host controller
2000 * @ap: port to which command is being issued
2001 * @tf: ATA taskfile register set
2003 * Issues ATA taskfile register set to ATA host controller,
2004 * with proper synchronization with interrupt handler and
2008 * spin_lock_irqsave(host_set lock)
2011 static inline void ata_tf_to_host(struct ata_port
*ap
,
2012 const struct ata_taskfile
*tf
)
2014 ap
->ops
->tf_load(ap
, tf
);
2015 ap
->ops
->exec_command(ap
, tf
);
2019 * ata_busy_sleep - sleep until BSY clears, or timeout
2020 * @ap: port containing status register to be polled
2021 * @tmout_pat: impatience timeout
2022 * @tmout: overall timeout
2024 * Sleep until ATA Status register bit BSY clears,
2025 * or a timeout occurs.
2030 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2031 unsigned long tmout_pat
, unsigned long tmout
)
2033 unsigned long timer_start
, timeout
;
2036 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2037 timer_start
= jiffies
;
2038 timeout
= timer_start
+ tmout_pat
;
2039 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2041 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2044 if (status
& ATA_BUSY
)
2045 printk(KERN_WARNING
"ata%u is slow to respond, "
2046 "please be patient\n", ap
->id
);
2048 timeout
= timer_start
+ tmout
;
2049 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2051 status
= ata_chk_status(ap
);
2054 if (status
& ATA_BUSY
) {
2055 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2056 ap
->id
, tmout
/ HZ
);
2063 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2065 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2066 unsigned int dev0
= devmask
& (1 << 0);
2067 unsigned int dev1
= devmask
& (1 << 1);
2068 unsigned long timeout
;
2070 /* if device 0 was found in ata_devchk, wait for its
2074 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2076 /* if device 1 was found in ata_devchk, wait for
2077 * register access, then wait for BSY to clear
2079 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2083 ap
->ops
->dev_select(ap
, 1);
2084 if (ap
->flags
& ATA_FLAG_MMIO
) {
2085 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2086 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2088 nsect
= inb(ioaddr
->nsect_addr
);
2089 lbal
= inb(ioaddr
->lbal_addr
);
2091 if ((nsect
== 1) && (lbal
== 1))
2093 if (time_after(jiffies
, timeout
)) {
2097 msleep(50); /* give drive a breather */
2100 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2102 /* is all this really necessary? */
2103 ap
->ops
->dev_select(ap
, 0);
2105 ap
->ops
->dev_select(ap
, 1);
2107 ap
->ops
->dev_select(ap
, 0);
2110 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2111 unsigned int devmask
)
2113 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2115 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2117 /* software reset. causes dev0 to be selected */
2118 if (ap
->flags
& ATA_FLAG_MMIO
) {
2119 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2120 udelay(20); /* FIXME: flush */
2121 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2122 udelay(20); /* FIXME: flush */
2123 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2125 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2127 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2129 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2132 /* spec mandates ">= 2ms" before checking status.
2133 * We wait 150ms, because that was the magic delay used for
2134 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2135 * between when the ATA command register is written, and then
2136 * status is checked. Because waiting for "a while" before
2137 * checking status is fine, post SRST, we perform this magic
2138 * delay here as well.
2140 * Old drivers/ide uses the 2mS rule and then waits for ready
2144 /* Before we perform post reset processing we want to see if
2145 * the bus shows 0xFF because the odd clown forgets the D7
2146 * pulldown resistor.
2148 if (ata_check_status(ap
) == 0xFF)
2149 return AC_ERR_OTHER
;
2151 ata_bus_post_reset(ap
, devmask
);
2157 * ata_bus_reset - reset host port and associated ATA channel
2158 * @ap: port to reset
2160 * This is typically the first time we actually start issuing
2161 * commands to the ATA channel. We wait for BSY to clear, then
2162 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2163 * result. Determine what devices, if any, are on the channel
2164 * by looking at the device 0/1 error register. Look at the signature
2165 * stored in each device's taskfile registers, to determine if
2166 * the device is ATA or ATAPI.
2169 * PCI/etc. bus probe sem.
2170 * Obtains host_set lock.
2173 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2176 void ata_bus_reset(struct ata_port
*ap
)
2178 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2179 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2181 unsigned int dev0
, dev1
= 0, devmask
= 0;
2183 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2185 /* determine if device 0/1 are present */
2186 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2189 dev0
= ata_devchk(ap
, 0);
2191 dev1
= ata_devchk(ap
, 1);
2195 devmask
|= (1 << 0);
2197 devmask
|= (1 << 1);
2199 /* select device 0 again */
2200 ap
->ops
->dev_select(ap
, 0);
2202 /* issue bus reset */
2203 if (ap
->flags
& ATA_FLAG_SRST
)
2204 if (ata_bus_softreset(ap
, devmask
))
2208 * determine by signature whether we have ATA or ATAPI devices
2210 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2211 if ((slave_possible
) && (err
!= 0x81))
2212 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2214 /* re-enable interrupts */
2215 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2218 /* is double-select really necessary? */
2219 if (ap
->device
[1].class != ATA_DEV_NONE
)
2220 ap
->ops
->dev_select(ap
, 1);
2221 if (ap
->device
[0].class != ATA_DEV_NONE
)
2222 ap
->ops
->dev_select(ap
, 0);
2224 /* if no devices were detected, disable this port */
2225 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2226 (ap
->device
[1].class == ATA_DEV_NONE
))
2229 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2230 /* set up device control for ATA_FLAG_SATA_RESET */
2231 if (ap
->flags
& ATA_FLAG_MMIO
)
2232 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2234 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2241 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2242 ap
->ops
->port_disable(ap
);
2247 static int sata_phy_resume(struct ata_port
*ap
)
2249 unsigned long timeout
= jiffies
+ (HZ
* 5);
2250 u32 scontrol
, sstatus
;
2252 scontrol
= scr_read(ap
, SCR_CONTROL
);
2253 scontrol
= (scontrol
& 0x0f0) | 0x300;
2254 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2256 /* Wait for phy to become ready, if necessary. */
2259 sstatus
= scr_read(ap
, SCR_STATUS
);
2260 if ((sstatus
& 0xf) != 1)
2262 } while (time_before(jiffies
, timeout
));
2268 * ata_std_probeinit - initialize probing
2269 * @ap: port to be probed
2271 * @ap is about to be probed. Initialize it. This function is
2272 * to be used as standard callback for ata_drive_probe_reset().
2274 * NOTE!!! Do not use this function as probeinit if a low level
2275 * driver implements only hardreset. Just pass NULL as probeinit
2276 * in that case. Using this function is probably okay but doing
2277 * so makes reset sequence different from the original
2278 * ->phy_reset implementation and Jeff nervous. :-P
2280 void ata_std_probeinit(struct ata_port
*ap
)
2282 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2285 sata_phy_resume(ap
);
2287 spd
= (scr_read(ap
, SCR_CONTROL
) & 0xf0) >> 4;
2289 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2291 if (sata_dev_present(ap
))
2292 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2297 * ata_std_softreset - reset host port via ATA SRST
2298 * @ap: port to reset
2299 * @verbose: fail verbosely
2300 * @classes: resulting classes of attached devices
2302 * Reset host port using ATA SRST. This function is to be used
2303 * as standard callback for ata_drive_*_reset() functions.
2306 * Kernel thread context (may sleep)
2309 * 0 on success, -errno otherwise.
2311 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2313 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2314 unsigned int devmask
= 0, err_mask
;
2319 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2320 classes
[0] = ATA_DEV_NONE
;
2324 /* determine if device 0/1 are present */
2325 if (ata_devchk(ap
, 0))
2326 devmask
|= (1 << 0);
2327 if (slave_possible
&& ata_devchk(ap
, 1))
2328 devmask
|= (1 << 1);
2330 /* select device 0 again */
2331 ap
->ops
->dev_select(ap
, 0);
2333 /* issue bus reset */
2334 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2335 err_mask
= ata_bus_softreset(ap
, devmask
);
2338 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2341 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2346 /* determine by signature whether we have ATA or ATAPI devices */
2347 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2348 if (slave_possible
&& err
!= 0x81)
2349 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2352 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2357 * sata_std_hardreset - reset host port via SATA phy reset
2358 * @ap: port to reset
2359 * @verbose: fail verbosely
2360 * @class: resulting class of attached device
2362 * SATA phy-reset host port using DET bits of SControl register.
2363 * This function is to be used as standard callback for
2364 * ata_drive_*_reset().
2367 * Kernel thread context (may sleep)
2370 * 0 on success, -errno otherwise.
2372 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2378 if (ata_set_sata_spd_needed(ap
)) {
2379 /* SATA spec says nothing about how to reconfigure
2380 * spd. To be on the safe side, turn off phy during
2381 * reconfiguration. This works for at least ICH7 AHCI
2384 scontrol
= scr_read(ap
, SCR_CONTROL
);
2385 scontrol
= (scontrol
& 0x0f0) | 0x302;
2386 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2388 ata_set_sata_spd(ap
);
2391 /* issue phy wake/reset */
2392 scontrol
= scr_read(ap
, SCR_CONTROL
);
2393 scontrol
= (scontrol
& 0x0f0) | 0x301;
2394 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2396 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2397 * 10.4.2 says at least 1 ms.
2401 /* bring phy back */
2402 sata_phy_resume(ap
);
2404 /* TODO: phy layer with polling, timeouts, etc. */
2405 if (!sata_dev_present(ap
)) {
2406 *class = ATA_DEV_NONE
;
2407 DPRINTK("EXIT, link offline\n");
2411 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2413 printk(KERN_ERR
"ata%u: COMRESET failed "
2414 "(device not ready)\n", ap
->id
);
2416 DPRINTK("EXIT, device not ready\n");
2420 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2422 *class = ata_dev_try_classify(ap
, 0, NULL
);
2424 DPRINTK("EXIT, class=%u\n", *class);
2429 * ata_std_postreset - standard postreset callback
2430 * @ap: the target ata_port
2431 * @classes: classes of attached devices
2433 * This function is invoked after a successful reset. Note that
2434 * the device might have been reset more than once using
2435 * different reset methods before postreset is invoked.
2437 * This function is to be used as standard callback for
2438 * ata_drive_*_reset().
2441 * Kernel thread context (may sleep)
2443 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2447 /* set cable type if it isn't already set */
2448 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2449 ap
->cbl
= ATA_CBL_SATA
;
2451 /* print link status */
2452 if (ap
->cbl
== ATA_CBL_SATA
)
2453 sata_print_link_status(ap
);
2455 /* re-enable interrupts */
2456 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2459 /* is double-select really necessary? */
2460 if (classes
[0] != ATA_DEV_NONE
)
2461 ap
->ops
->dev_select(ap
, 1);
2462 if (classes
[1] != ATA_DEV_NONE
)
2463 ap
->ops
->dev_select(ap
, 0);
2465 /* bail out if no device is present */
2466 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2467 DPRINTK("EXIT, no device\n");
2471 /* set up device control */
2472 if (ap
->ioaddr
.ctl_addr
) {
2473 if (ap
->flags
& ATA_FLAG_MMIO
)
2474 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2476 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2483 * ata_std_probe_reset - standard probe reset method
2484 * @ap: prot to perform probe-reset
2485 * @classes: resulting classes of attached devices
2487 * The stock off-the-shelf ->probe_reset method.
2490 * Kernel thread context (may sleep)
2493 * 0 on success, -errno otherwise.
2495 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2497 ata_reset_fn_t hardreset
;
2500 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2501 hardreset
= sata_std_hardreset
;
2503 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2504 ata_std_softreset
, hardreset
,
2505 ata_std_postreset
, classes
);
2508 static int ata_do_reset(struct ata_port
*ap
,
2509 ata_reset_fn_t reset
, ata_postreset_fn_t postreset
,
2510 int verbose
, unsigned int *classes
)
2514 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2515 classes
[i
] = ATA_DEV_UNKNOWN
;
2517 rc
= reset(ap
, verbose
, classes
);
2521 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2522 * is complete and convert all ATA_DEV_UNKNOWN to
2525 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2526 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2529 if (i
< ATA_MAX_DEVICES
)
2530 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2531 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2532 classes
[i
] = ATA_DEV_NONE
;
2535 postreset(ap
, classes
);
2541 * ata_drive_probe_reset - Perform probe reset with given methods
2542 * @ap: port to reset
2543 * @probeinit: probeinit method (can be NULL)
2544 * @softreset: softreset method (can be NULL)
2545 * @hardreset: hardreset method (can be NULL)
2546 * @postreset: postreset method (can be NULL)
2547 * @classes: resulting classes of attached devices
2549 * Reset the specified port and classify attached devices using
2550 * given methods. This function prefers softreset but tries all
2551 * possible reset sequences to reset and classify devices. This
2552 * function is intended to be used for constructing ->probe_reset
2553 * callback by low level drivers.
2555 * Reset methods should follow the following rules.
2557 * - Return 0 on sucess, -errno on failure.
2558 * - If classification is supported, fill classes[] with
2559 * recognized class codes.
2560 * - If classification is not supported, leave classes[] alone.
2561 * - If verbose is non-zero, print error message on failure;
2562 * otherwise, shut up.
2565 * Kernel thread context (may sleep)
2568 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2569 * if classification fails, and any error code from reset
2572 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2573 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2574 ata_postreset_fn_t postreset
, unsigned int *classes
)
2581 if (softreset
&& !ata_set_sata_spd_needed(ap
)) {
2582 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2583 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2591 rc
= ata_do_reset(ap
, hardreset
, postreset
, 0, classes
);
2593 if (classes
[0] != ATA_DEV_UNKNOWN
)
2598 if (ata_down_sata_spd_limit(ap
))
2603 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2606 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2612 * ata_dev_same_device - Determine whether new ID matches configured device
2613 * @ap: port on which the device to compare against resides
2614 * @dev: device to compare against
2615 * @new_class: class of the new device
2616 * @new_id: IDENTIFY page of the new device
2618 * Compare @new_class and @new_id against @dev and determine
2619 * whether @dev is the device indicated by @new_class and
2626 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2628 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2629 unsigned int new_class
, const u16
*new_id
)
2631 const u16
*old_id
= dev
->id
;
2632 unsigned char model
[2][41], serial
[2][21];
2635 if (dev
->class != new_class
) {
2637 "ata%u: dev %u class mismatch %d != %d\n",
2638 ap
->id
, dev
->devno
, dev
->class, new_class
);
2642 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2643 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2644 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2645 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2646 new_n_sectors
= ata_id_n_sectors(new_id
);
2648 if (strcmp(model
[0], model
[1])) {
2650 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2651 ap
->id
, dev
->devno
, model
[0], model
[1]);
2655 if (strcmp(serial
[0], serial
[1])) {
2657 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2658 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2662 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2664 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2665 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2666 (unsigned long long)new_n_sectors
);
2674 * ata_dev_revalidate - Revalidate ATA device
2675 * @ap: port on which the device to revalidate resides
2676 * @dev: device to revalidate
2677 * @post_reset: is this revalidation after reset?
2679 * Re-read IDENTIFY page and make sure @dev is still attached to
2683 * Kernel thread context (may sleep)
2686 * 0 on success, negative errno otherwise
2688 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2695 if (!ata_dev_enabled(dev
))
2701 /* allocate & read ID data */
2702 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2706 /* is the device still there? */
2707 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2715 /* configure device according to the new ID */
2716 return ata_dev_configure(ap
, dev
, 0);
2719 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2720 ap
->id
, dev
->devno
, rc
);
2725 static const char * const ata_dma_blacklist
[] = {
2726 "WDC AC11000H", NULL
,
2727 "WDC AC22100H", NULL
,
2728 "WDC AC32500H", NULL
,
2729 "WDC AC33100H", NULL
,
2730 "WDC AC31600H", NULL
,
2731 "WDC AC32100H", "24.09P07",
2732 "WDC AC23200L", "21.10N21",
2733 "Compaq CRD-8241B", NULL
,
2738 "SanDisk SDP3B", NULL
,
2739 "SanDisk SDP3B-64", NULL
,
2740 "SANYO CD-ROM CRD", NULL
,
2741 "HITACHI CDR-8", NULL
,
2742 "HITACHI CDR-8335", NULL
,
2743 "HITACHI CDR-8435", NULL
,
2744 "Toshiba CD-ROM XM-6202B", NULL
,
2745 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2747 "E-IDE CD-ROM CR-840", NULL
,
2748 "CD-ROM Drive/F5A", NULL
,
2749 "WPI CDD-820", NULL
,
2750 "SAMSUNG CD-ROM SC-148C", NULL
,
2751 "SAMSUNG CD-ROM SC", NULL
,
2752 "SanDisk SDP3B-64", NULL
,
2753 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2754 "_NEC DV5800A", NULL
,
2755 "SAMSUNG CD-ROM SN-124", "N001"
2758 static int ata_strim(char *s
, size_t len
)
2760 len
= strnlen(s
, len
);
2762 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2763 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2770 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2772 unsigned char model_num
[40];
2773 unsigned char model_rev
[16];
2774 unsigned int nlen
, rlen
;
2777 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2779 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2781 nlen
= ata_strim(model_num
, sizeof(model_num
));
2782 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2784 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2785 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2786 if (ata_dma_blacklist
[i
+1] == NULL
)
2788 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2796 * ata_dev_xfermask - Compute supported xfermask of the given device
2797 * @ap: Port on which the device to compute xfermask for resides
2798 * @dev: Device to compute xfermask for
2800 * Compute supported xfermask of @dev and store it in
2801 * dev->*_mask. This function is responsible for applying all
2802 * known limits including host controller limits, device
2805 * FIXME: The current implementation limits all transfer modes to
2806 * the fastest of the lowested device on the port. This is not
2807 * required on most controllers.
2812 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2814 struct ata_host_set
*hs
= ap
->host_set
;
2815 unsigned long xfer_mask
;
2818 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2821 /* FIXME: Use port-wide xfermask for now */
2822 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2823 struct ata_device
*d
= &ap
->device
[i
];
2824 if (!ata_dev_enabled(d
))
2826 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
, d
->mwdma_mask
,
2828 xfer_mask
&= ata_id_xfermask(d
->id
);
2829 if (ata_dma_blacklisted(d
))
2830 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2831 /* Apply cable rule here. Don't apply it early because when
2832 we handle hot plug the cable type can itself change */
2833 if (ap
->cbl
== ATA_CBL_PATA40
)
2834 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2837 if (ata_dma_blacklisted(dev
))
2838 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2839 "disabling DMA\n", ap
->id
, dev
->devno
);
2841 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2842 if (hs
->simplex_claimed
)
2843 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2845 if (ap
->ops
->mode_filter
)
2846 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2848 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2853 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2854 * @ap: Port associated with device @dev
2855 * @dev: Device to which command will be sent
2857 * Issue SET FEATURES - XFER MODE command to device @dev
2861 * PCI/etc. bus probe sem.
2864 * 0 on success, AC_ERR_* mask otherwise.
2867 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2868 struct ata_device
*dev
)
2870 struct ata_taskfile tf
;
2871 unsigned int err_mask
;
2873 /* set up set-features taskfile */
2874 DPRINTK("set features - xfer mode\n");
2876 ata_tf_init(ap
, &tf
, dev
->devno
);
2877 tf
.command
= ATA_CMD_SET_FEATURES
;
2878 tf
.feature
= SETFEATURES_XFER
;
2879 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2880 tf
.protocol
= ATA_PROT_NODATA
;
2881 tf
.nsect
= dev
->xfer_mode
;
2883 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2885 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2890 * ata_dev_init_params - Issue INIT DEV PARAMS command
2891 * @ap: Port associated with device @dev
2892 * @dev: Device to which command will be sent
2895 * Kernel thread context (may sleep)
2898 * 0 on success, AC_ERR_* mask otherwise.
2901 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2902 struct ata_device
*dev
,
2906 struct ata_taskfile tf
;
2907 unsigned int err_mask
;
2909 /* Number of sectors per track 1-255. Number of heads 1-16 */
2910 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2911 return AC_ERR_INVALID
;
2913 /* set up init dev params taskfile */
2914 DPRINTK("init dev params \n");
2916 ata_tf_init(ap
, &tf
, dev
->devno
);
2917 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2918 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2919 tf
.protocol
= ATA_PROT_NODATA
;
2921 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2923 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2925 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2930 * ata_sg_clean - Unmap DMA memory associated with command
2931 * @qc: Command containing DMA memory to be released
2933 * Unmap all mapped DMA memory associated with this command.
2936 * spin_lock_irqsave(host_set lock)
2939 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2941 struct ata_port
*ap
= qc
->ap
;
2942 struct scatterlist
*sg
= qc
->__sg
;
2943 int dir
= qc
->dma_dir
;
2944 void *pad_buf
= NULL
;
2946 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2947 WARN_ON(sg
== NULL
);
2949 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2950 WARN_ON(qc
->n_elem
> 1);
2952 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2954 /* if we padded the buffer out to 32-bit bound, and data
2955 * xfer direction is from-device, we must copy from the
2956 * pad buffer back into the supplied buffer
2958 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2959 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2961 if (qc
->flags
& ATA_QCFLAG_SG
) {
2963 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
2964 /* restore last sg */
2965 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2967 struct scatterlist
*psg
= &qc
->pad_sgent
;
2968 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2969 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2970 kunmap_atomic(addr
, KM_IRQ0
);
2974 dma_unmap_single(ap
->dev
,
2975 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2978 sg
->length
+= qc
->pad_len
;
2980 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2981 pad_buf
, qc
->pad_len
);
2984 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2989 * ata_fill_sg - Fill PCI IDE PRD table
2990 * @qc: Metadata associated with taskfile to be transferred
2992 * Fill PCI IDE PRD (scatter-gather) table with segments
2993 * associated with the current disk command.
2996 * spin_lock_irqsave(host_set lock)
2999 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3001 struct ata_port
*ap
= qc
->ap
;
3002 struct scatterlist
*sg
;
3005 WARN_ON(qc
->__sg
== NULL
);
3006 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3009 ata_for_each_sg(sg
, qc
) {
3013 /* determine if physical DMA addr spans 64K boundary.
3014 * Note h/w doesn't support 64-bit, so we unconditionally
3015 * truncate dma_addr_t to u32.
3017 addr
= (u32
) sg_dma_address(sg
);
3018 sg_len
= sg_dma_len(sg
);
3021 offset
= addr
& 0xffff;
3023 if ((offset
+ sg_len
) > 0x10000)
3024 len
= 0x10000 - offset
;
3026 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3027 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3028 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3037 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3040 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3041 * @qc: Metadata associated with taskfile to check
3043 * Allow low-level driver to filter ATA PACKET commands, returning
3044 * a status indicating whether or not it is OK to use DMA for the
3045 * supplied PACKET command.
3048 * spin_lock_irqsave(host_set lock)
3050 * RETURNS: 0 when ATAPI DMA can be used
3053 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3055 struct ata_port
*ap
= qc
->ap
;
3056 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3058 if (ap
->ops
->check_atapi_dma
)
3059 rc
= ap
->ops
->check_atapi_dma(qc
);
3064 * ata_qc_prep - Prepare taskfile for submission
3065 * @qc: Metadata associated with taskfile to be prepared
3067 * Prepare ATA taskfile for submission.
3070 * spin_lock_irqsave(host_set lock)
3072 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3074 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3080 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3083 * ata_sg_init_one - Associate command with memory buffer
3084 * @qc: Command to be associated
3085 * @buf: Memory buffer
3086 * @buflen: Length of memory buffer, in bytes.
3088 * Initialize the data-related elements of queued_cmd @qc
3089 * to point to a single memory buffer, @buf of byte length @buflen.
3092 * spin_lock_irqsave(host_set lock)
3095 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3097 struct scatterlist
*sg
;
3099 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3101 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3102 qc
->__sg
= &qc
->sgent
;
3104 qc
->orig_n_elem
= 1;
3108 sg_init_one(sg
, buf
, buflen
);
3112 * ata_sg_init - Associate command with scatter-gather table.
3113 * @qc: Command to be associated
3114 * @sg: Scatter-gather table.
3115 * @n_elem: Number of elements in s/g table.
3117 * Initialize the data-related elements of queued_cmd @qc
3118 * to point to a scatter-gather table @sg, containing @n_elem
3122 * spin_lock_irqsave(host_set lock)
3125 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3126 unsigned int n_elem
)
3128 qc
->flags
|= ATA_QCFLAG_SG
;
3130 qc
->n_elem
= n_elem
;
3131 qc
->orig_n_elem
= n_elem
;
3135 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3136 * @qc: Command with memory buffer to be mapped.
3138 * DMA-map the memory buffer associated with queued_cmd @qc.
3141 * spin_lock_irqsave(host_set lock)
3144 * Zero on success, negative on error.
3147 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3149 struct ata_port
*ap
= qc
->ap
;
3150 int dir
= qc
->dma_dir
;
3151 struct scatterlist
*sg
= qc
->__sg
;
3152 dma_addr_t dma_address
;
3155 /* we must lengthen transfers to end on a 32-bit boundary */
3156 qc
->pad_len
= sg
->length
& 3;
3158 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3159 struct scatterlist
*psg
= &qc
->pad_sgent
;
3161 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3163 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3165 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3166 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3169 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3170 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3172 sg
->length
-= qc
->pad_len
;
3173 if (sg
->length
== 0)
3176 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3177 sg
->length
, qc
->pad_len
);
3185 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3187 if (dma_mapping_error(dma_address
)) {
3189 sg
->length
+= qc
->pad_len
;
3193 sg_dma_address(sg
) = dma_address
;
3194 sg_dma_len(sg
) = sg
->length
;
3197 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3198 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3204 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3205 * @qc: Command with scatter-gather table to be mapped.
3207 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3210 * spin_lock_irqsave(host_set lock)
3213 * Zero on success, negative on error.
3217 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3219 struct ata_port
*ap
= qc
->ap
;
3220 struct scatterlist
*sg
= qc
->__sg
;
3221 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3222 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3224 VPRINTK("ENTER, ata%u\n", ap
->id
);
3225 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3227 /* we must lengthen transfers to end on a 32-bit boundary */
3228 qc
->pad_len
= lsg
->length
& 3;
3230 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3231 struct scatterlist
*psg
= &qc
->pad_sgent
;
3232 unsigned int offset
;
3234 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3236 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3239 * psg->page/offset are used to copy to-be-written
3240 * data in this function or read data in ata_sg_clean.
3242 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3243 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3244 psg
->offset
= offset_in_page(offset
);
3246 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3247 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3248 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3249 kunmap_atomic(addr
, KM_IRQ0
);
3252 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3253 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3255 lsg
->length
-= qc
->pad_len
;
3256 if (lsg
->length
== 0)
3259 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3260 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3263 pre_n_elem
= qc
->n_elem
;
3264 if (trim_sg
&& pre_n_elem
)
3273 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3275 /* restore last sg */
3276 lsg
->length
+= qc
->pad_len
;
3280 DPRINTK("%d sg elements mapped\n", n_elem
);
3283 qc
->n_elem
= n_elem
;
3289 * ata_poll_qc_complete - turn irq back on and finish qc
3290 * @qc: Command to complete
3291 * @err_mask: ATA status register content
3294 * None. (grabs host lock)
3297 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3299 struct ata_port
*ap
= qc
->ap
;
3300 unsigned long flags
;
3302 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3303 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3305 ata_qc_complete(qc
);
3306 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3310 * ata_pio_poll - poll using PIO, depending on current state
3311 * @ap: the target ata_port
3314 * None. (executing in kernel thread context)
3317 * timeout value to use
3320 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3322 struct ata_queued_cmd
*qc
;
3324 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3325 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3327 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3328 WARN_ON(qc
== NULL
);
3330 switch (ap
->hsm_task_state
) {
3333 poll_state
= HSM_ST_POLL
;
3337 case HSM_ST_LAST_POLL
:
3338 poll_state
= HSM_ST_LAST_POLL
;
3339 reg_state
= HSM_ST_LAST
;
3346 status
= ata_chk_status(ap
);
3347 if (status
& ATA_BUSY
) {
3348 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3349 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3350 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3353 ap
->hsm_task_state
= poll_state
;
3354 return ATA_SHORT_PAUSE
;
3357 ap
->hsm_task_state
= reg_state
;
3362 * ata_pio_complete - check if drive is busy or idle
3363 * @ap: the target ata_port
3366 * None. (executing in kernel thread context)
3369 * Non-zero if qc completed, zero otherwise.
3372 static int ata_pio_complete (struct ata_port
*ap
)
3374 struct ata_queued_cmd
*qc
;
3378 * This is purely heuristic. This is a fast path. Sometimes when
3379 * we enter, BSY will be cleared in a chk-status or two. If not,
3380 * the drive is probably seeking or something. Snooze for a couple
3381 * msecs, then chk-status again. If still busy, fall back to
3382 * HSM_ST_POLL state.
3384 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3385 if (drv_stat
& ATA_BUSY
) {
3387 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3388 if (drv_stat
& ATA_BUSY
) {
3389 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3390 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3395 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3396 WARN_ON(qc
== NULL
);
3398 drv_stat
= ata_wait_idle(ap
);
3399 if (!ata_ok(drv_stat
)) {
3400 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3401 ap
->hsm_task_state
= HSM_ST_ERR
;
3405 ap
->hsm_task_state
= HSM_ST_IDLE
;
3407 WARN_ON(qc
->err_mask
);
3408 ata_poll_qc_complete(qc
);
3410 /* another command may start at this point */
3417 * swap_buf_le16 - swap halves of 16-bit words in place
3418 * @buf: Buffer to swap
3419 * @buf_words: Number of 16-bit words in buffer.
3421 * Swap halves of 16-bit words if needed to convert from
3422 * little-endian byte order to native cpu byte order, or
3426 * Inherited from caller.
3428 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3433 for (i
= 0; i
< buf_words
; i
++)
3434 buf
[i
] = le16_to_cpu(buf
[i
]);
3435 #endif /* __BIG_ENDIAN */
3439 * ata_mmio_data_xfer - Transfer data by MMIO
3440 * @ap: port to read/write
3442 * @buflen: buffer length
3443 * @write_data: read/write
3445 * Transfer data from/to the device data register by MMIO.
3448 * Inherited from caller.
3451 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3452 unsigned int buflen
, int write_data
)
3455 unsigned int words
= buflen
>> 1;
3456 u16
*buf16
= (u16
*) buf
;
3457 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3459 /* Transfer multiple of 2 bytes */
3461 for (i
= 0; i
< words
; i
++)
3462 writew(le16_to_cpu(buf16
[i
]), mmio
);
3464 for (i
= 0; i
< words
; i
++)
3465 buf16
[i
] = cpu_to_le16(readw(mmio
));
3468 /* Transfer trailing 1 byte, if any. */
3469 if (unlikely(buflen
& 0x01)) {
3470 u16 align_buf
[1] = { 0 };
3471 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3474 memcpy(align_buf
, trailing_buf
, 1);
3475 writew(le16_to_cpu(align_buf
[0]), mmio
);
3477 align_buf
[0] = cpu_to_le16(readw(mmio
));
3478 memcpy(trailing_buf
, align_buf
, 1);
3484 * ata_pio_data_xfer - Transfer data by PIO
3485 * @ap: port to read/write
3487 * @buflen: buffer length
3488 * @write_data: read/write
3490 * Transfer data from/to the device data register by PIO.
3493 * Inherited from caller.
3496 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3497 unsigned int buflen
, int write_data
)
3499 unsigned int words
= buflen
>> 1;
3501 /* Transfer multiple of 2 bytes */
3503 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3505 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3507 /* Transfer trailing 1 byte, if any. */
3508 if (unlikely(buflen
& 0x01)) {
3509 u16 align_buf
[1] = { 0 };
3510 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3513 memcpy(align_buf
, trailing_buf
, 1);
3514 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3516 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3517 memcpy(trailing_buf
, align_buf
, 1);
3523 * ata_data_xfer - Transfer data from/to the data register.
3524 * @ap: port to read/write
3526 * @buflen: buffer length
3527 * @do_write: read/write
3529 * Transfer data from/to the device data register.
3532 * Inherited from caller.
3535 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3536 unsigned int buflen
, int do_write
)
3538 /* Make the crap hardware pay the costs not the good stuff */
3539 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3540 unsigned long flags
;
3541 local_irq_save(flags
);
3542 if (ap
->flags
& ATA_FLAG_MMIO
)
3543 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3545 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3546 local_irq_restore(flags
);
3548 if (ap
->flags
& ATA_FLAG_MMIO
)
3549 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3551 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3556 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3557 * @qc: Command on going
3559 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3562 * Inherited from caller.
3565 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3567 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3568 struct scatterlist
*sg
= qc
->__sg
;
3569 struct ata_port
*ap
= qc
->ap
;
3571 unsigned int offset
;
3574 if (qc
->cursect
== (qc
->nsect
- 1))
3575 ap
->hsm_task_state
= HSM_ST_LAST
;
3577 page
= sg
[qc
->cursg
].page
;
3578 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3580 /* get the current page and offset */
3581 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3582 offset
%= PAGE_SIZE
;
3584 buf
= kmap(page
) + offset
;
3589 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3594 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3596 /* do the actual data transfer */
3597 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3598 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3604 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3605 * @qc: Command on going
3606 * @bytes: number of bytes
3608 * Transfer Transfer data from/to the ATAPI device.
3611 * Inherited from caller.
3615 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3617 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3618 struct scatterlist
*sg
= qc
->__sg
;
3619 struct ata_port
*ap
= qc
->ap
;
3622 unsigned int offset
, count
;
3624 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3625 ap
->hsm_task_state
= HSM_ST_LAST
;
3628 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3630 * The end of qc->sg is reached and the device expects
3631 * more data to transfer. In order not to overrun qc->sg
3632 * and fulfill length specified in the byte count register,
3633 * - for read case, discard trailing data from the device
3634 * - for write case, padding zero data to the device
3636 u16 pad_buf
[1] = { 0 };
3637 unsigned int words
= bytes
>> 1;
3640 if (words
) /* warning if bytes > 1 */
3641 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3644 for (i
= 0; i
< words
; i
++)
3645 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3647 ap
->hsm_task_state
= HSM_ST_LAST
;
3651 sg
= &qc
->__sg
[qc
->cursg
];
3654 offset
= sg
->offset
+ qc
->cursg_ofs
;
3656 /* get the current page and offset */
3657 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3658 offset
%= PAGE_SIZE
;
3660 /* don't overrun current sg */
3661 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3663 /* don't cross page boundaries */
3664 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3666 buf
= kmap(page
) + offset
;
3669 qc
->curbytes
+= count
;
3670 qc
->cursg_ofs
+= count
;
3672 if (qc
->cursg_ofs
== sg
->length
) {
3677 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3679 /* do the actual data transfer */
3680 ata_data_xfer(ap
, buf
, count
, do_write
);
3689 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3690 * @qc: Command on going
3692 * Transfer Transfer data from/to the ATAPI device.
3695 * Inherited from caller.
3698 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3700 struct ata_port
*ap
= qc
->ap
;
3701 struct ata_device
*dev
= qc
->dev
;
3702 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3703 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3705 ap
->ops
->tf_read(ap
, &qc
->tf
);
3706 ireason
= qc
->tf
.nsect
;
3707 bc_lo
= qc
->tf
.lbam
;
3708 bc_hi
= qc
->tf
.lbah
;
3709 bytes
= (bc_hi
<< 8) | bc_lo
;
3711 /* shall be cleared to zero, indicating xfer of data */
3712 if (ireason
& (1 << 0))
3715 /* make sure transfer direction matches expected */
3716 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3717 if (do_write
!= i_write
)
3720 __atapi_pio_bytes(qc
, bytes
);
3725 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3726 ap
->id
, dev
->devno
);
3727 qc
->err_mask
|= AC_ERR_HSM
;
3728 ap
->hsm_task_state
= HSM_ST_ERR
;
3732 * ata_pio_block - start PIO on a block
3733 * @ap: the target ata_port
3736 * None. (executing in kernel thread context)
3739 static void ata_pio_block(struct ata_port
*ap
)
3741 struct ata_queued_cmd
*qc
;
3745 * This is purely heuristic. This is a fast path.
3746 * Sometimes when we enter, BSY will be cleared in
3747 * a chk-status or two. If not, the drive is probably seeking
3748 * or something. Snooze for a couple msecs, then
3749 * chk-status again. If still busy, fall back to
3750 * HSM_ST_POLL state.
3752 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3753 if (status
& ATA_BUSY
) {
3755 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3756 if (status
& ATA_BUSY
) {
3757 ap
->hsm_task_state
= HSM_ST_POLL
;
3758 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3763 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3764 WARN_ON(qc
== NULL
);
3767 if (status
& (ATA_ERR
| ATA_DF
)) {
3768 qc
->err_mask
|= AC_ERR_DEV
;
3769 ap
->hsm_task_state
= HSM_ST_ERR
;
3773 /* transfer data if any */
3774 if (is_atapi_taskfile(&qc
->tf
)) {
3775 /* DRQ=0 means no more data to transfer */
3776 if ((status
& ATA_DRQ
) == 0) {
3777 ap
->hsm_task_state
= HSM_ST_LAST
;
3781 atapi_pio_bytes(qc
);
3783 /* handle BSY=0, DRQ=0 as error */
3784 if ((status
& ATA_DRQ
) == 0) {
3785 qc
->err_mask
|= AC_ERR_HSM
;
3786 ap
->hsm_task_state
= HSM_ST_ERR
;
3794 static void ata_pio_error(struct ata_port
*ap
)
3796 struct ata_queued_cmd
*qc
;
3798 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3799 WARN_ON(qc
== NULL
);
3801 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3802 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3804 /* make sure qc->err_mask is available to
3805 * know what's wrong and recover
3807 WARN_ON(qc
->err_mask
== 0);
3809 ap
->hsm_task_state
= HSM_ST_IDLE
;
3811 ata_poll_qc_complete(qc
);
3814 static void ata_pio_task(void *_data
)
3816 struct ata_port
*ap
= _data
;
3817 unsigned long timeout
;
3824 switch (ap
->hsm_task_state
) {
3833 qc_completed
= ata_pio_complete(ap
);
3837 case HSM_ST_LAST_POLL
:
3838 timeout
= ata_pio_poll(ap
);
3848 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3849 else if (!qc_completed
)
3854 * atapi_packet_task - Write CDB bytes to hardware
3855 * @_data: Port to which ATAPI device is attached.
3857 * When device has indicated its readiness to accept
3858 * a CDB, this function is called. Send the CDB.
3859 * If DMA is to be performed, exit immediately.
3860 * Otherwise, we are in polling mode, so poll
3861 * status under operation succeeds or fails.
3864 * Kernel thread context (may sleep)
3867 static void atapi_packet_task(void *_data
)
3869 struct ata_port
*ap
= _data
;
3870 struct ata_queued_cmd
*qc
;
3873 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3874 WARN_ON(qc
== NULL
);
3875 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3877 /* sleep-wait for BSY to clear */
3878 DPRINTK("busy wait\n");
3879 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3880 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3884 /* make sure DRQ is set */
3885 status
= ata_chk_status(ap
);
3886 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3887 qc
->err_mask
|= AC_ERR_HSM
;
3892 DPRINTK("send cdb\n");
3893 WARN_ON(qc
->dev
->cdb_len
< 12);
3895 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3896 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3897 unsigned long flags
;
3899 /* Once we're done issuing command and kicking bmdma,
3900 * irq handler takes over. To not lose irq, we need
3901 * to clear NOINTR flag before sending cdb, but
3902 * interrupt handler shouldn't be invoked before we're
3903 * finished. Hence, the following locking.
3905 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3906 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3907 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3908 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3909 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3910 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3912 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3914 /* PIO commands are handled by polling */
3915 ap
->hsm_task_state
= HSM_ST
;
3916 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3922 ata_poll_qc_complete(qc
);
3926 * ata_qc_timeout - Handle timeout of queued command
3927 * @qc: Command that timed out
3929 * Some part of the kernel (currently, only the SCSI layer)
3930 * has noticed that the active command on port @ap has not
3931 * completed after a specified length of time. Handle this
3932 * condition by disabling DMA (if necessary) and completing
3933 * transactions, with error if necessary.
3935 * This also handles the case of the "lost interrupt", where
3936 * for some reason (possibly hardware bug, possibly driver bug)
3937 * an interrupt was not delivered to the driver, even though the
3938 * transaction completed successfully.
3941 * Inherited from SCSI layer (none, can sleep)
3944 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3946 struct ata_port
*ap
= qc
->ap
;
3947 struct ata_host_set
*host_set
= ap
->host_set
;
3948 u8 host_stat
= 0, drv_stat
;
3949 unsigned long flags
;
3953 ap
->hsm_task_state
= HSM_ST_IDLE
;
3955 spin_lock_irqsave(&host_set
->lock
, flags
);
3957 switch (qc
->tf
.protocol
) {
3960 case ATA_PROT_ATAPI_DMA
:
3961 host_stat
= ap
->ops
->bmdma_status(ap
);
3963 /* before we do anything else, clear DMA-Start bit */
3964 ap
->ops
->bmdma_stop(qc
);
3970 drv_stat
= ata_chk_status(ap
);
3972 /* ack bmdma irq events */
3973 ap
->ops
->irq_clear(ap
);
3975 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3976 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3978 /* complete taskfile transaction */
3979 qc
->err_mask
|= ac_err_mask(drv_stat
);
3983 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3985 ata_eh_qc_complete(qc
);
3991 * ata_eng_timeout - Handle timeout of queued command
3992 * @ap: Port on which timed-out command is active
3994 * Some part of the kernel (currently, only the SCSI layer)
3995 * has noticed that the active command on port @ap has not
3996 * completed after a specified length of time. Handle this
3997 * condition by disabling DMA (if necessary) and completing
3998 * transactions, with error if necessary.
4000 * This also handles the case of the "lost interrupt", where
4001 * for some reason (possibly hardware bug, possibly driver bug)
4002 * an interrupt was not delivered to the driver, even though the
4003 * transaction completed successfully.
4006 * Inherited from SCSI layer (none, can sleep)
4009 void ata_eng_timeout(struct ata_port
*ap
)
4013 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
4019 * ata_qc_new - Request an available ATA command, for queueing
4020 * @ap: Port associated with device @dev
4021 * @dev: Device from whom we request an available command structure
4027 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4029 struct ata_queued_cmd
*qc
= NULL
;
4032 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4033 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4034 qc
= ata_qc_from_tag(ap
, i
);
4045 * ata_qc_new_init - Request an available ATA command, and initialize it
4046 * @ap: Port associated with device @dev
4047 * @dev: Device from whom we request an available command structure
4053 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4054 struct ata_device
*dev
)
4056 struct ata_queued_cmd
*qc
;
4058 qc
= ata_qc_new(ap
);
4071 * ata_qc_free - free unused ata_queued_cmd
4072 * @qc: Command to complete
4074 * Designed to free unused ata_queued_cmd object
4075 * in case something prevents using it.
4078 * spin_lock_irqsave(host_set lock)
4080 void ata_qc_free(struct ata_queued_cmd
*qc
)
4082 struct ata_port
*ap
= qc
->ap
;
4085 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4089 if (likely(ata_tag_valid(tag
))) {
4090 if (tag
== ap
->active_tag
)
4091 ap
->active_tag
= ATA_TAG_POISON
;
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 /* atapi: mark qc as inactive to prevent the interrupt handler
4106 * from completing the command twice later, before the error handler
4107 * is called. (when rc != 0 and atapi request sense is needed)
4109 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4111 /* call completion callback */
4112 qc
->complete_fn(qc
);
4115 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4117 struct ata_port
*ap
= qc
->ap
;
4119 switch (qc
->tf
.protocol
) {
4121 case ATA_PROT_ATAPI_DMA
:
4124 case ATA_PROT_ATAPI
:
4126 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4139 * ata_qc_issue - issue taskfile to device
4140 * @qc: command to issue to device
4142 * Prepare an ATA command to submission to device.
4143 * This includes mapping the data into a DMA-able
4144 * area, filling in the S/G table, and finally
4145 * writing the taskfile to hardware, starting the command.
4148 * spin_lock_irqsave(host_set lock)
4150 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4152 struct ata_port
*ap
= qc
->ap
;
4154 qc
->ap
->active_tag
= qc
->tag
;
4155 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4157 if (ata_should_dma_map(qc
)) {
4158 if (qc
->flags
& ATA_QCFLAG_SG
) {
4159 if (ata_sg_setup(qc
))
4161 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4162 if (ata_sg_setup_one(qc
))
4166 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4169 ap
->ops
->qc_prep(qc
);
4171 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4172 if (unlikely(qc
->err_mask
))
4177 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4178 qc
->err_mask
|= AC_ERR_SYSTEM
;
4180 ata_qc_complete(qc
);
4184 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4185 * @qc: command to issue to device
4187 * Using various libata functions and hooks, this function
4188 * starts an ATA command. ATA commands are grouped into
4189 * classes called "protocols", and issuing each type of protocol
4190 * is slightly different.
4192 * May be used as the qc_issue() entry in ata_port_operations.
4195 * spin_lock_irqsave(host_set lock)
4198 * Zero on success, AC_ERR_* mask on failure
4201 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4203 struct ata_port
*ap
= qc
->ap
;
4205 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4207 switch (qc
->tf
.protocol
) {
4208 case ATA_PROT_NODATA
:
4209 ata_tf_to_host(ap
, &qc
->tf
);
4213 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4214 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4215 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4218 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4219 ata_qc_set_polling(qc
);
4220 ata_tf_to_host(ap
, &qc
->tf
);
4221 ap
->hsm_task_state
= HSM_ST
;
4222 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4225 case ATA_PROT_ATAPI
:
4226 ata_qc_set_polling(qc
);
4227 ata_tf_to_host(ap
, &qc
->tf
);
4228 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4231 case ATA_PROT_ATAPI_NODATA
:
4232 ap
->flags
|= ATA_FLAG_NOINTR
;
4233 ata_tf_to_host(ap
, &qc
->tf
);
4234 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4237 case ATA_PROT_ATAPI_DMA
:
4238 ap
->flags
|= ATA_FLAG_NOINTR
;
4239 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4240 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4241 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4246 return AC_ERR_SYSTEM
;
4253 * ata_host_intr - Handle host interrupt for given (port, task)
4254 * @ap: Port on which interrupt arrived (possibly...)
4255 * @qc: Taskfile currently active in engine
4257 * Handle host interrupt for given queued command. Currently,
4258 * only DMA interrupts are handled. All other commands are
4259 * handled via polling with interrupts disabled (nIEN bit).
4262 * spin_lock_irqsave(host_set lock)
4265 * One if interrupt was handled, zero if not (shared irq).
4268 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4269 struct ata_queued_cmd
*qc
)
4271 u8 status
, host_stat
;
4273 switch (qc
->tf
.protocol
) {
4276 case ATA_PROT_ATAPI_DMA
:
4277 case ATA_PROT_ATAPI
:
4278 /* check status of DMA engine */
4279 host_stat
= ap
->ops
->bmdma_status(ap
);
4280 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4282 /* if it's not our irq... */
4283 if (!(host_stat
& ATA_DMA_INTR
))
4286 /* before we do anything else, clear DMA-Start bit */
4287 ap
->ops
->bmdma_stop(qc
);
4291 case ATA_PROT_ATAPI_NODATA
:
4292 case ATA_PROT_NODATA
:
4293 /* check altstatus */
4294 status
= ata_altstatus(ap
);
4295 if (status
& ATA_BUSY
)
4298 /* check main status, clearing INTRQ */
4299 status
= ata_chk_status(ap
);
4300 if (unlikely(status
& ATA_BUSY
))
4302 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4303 ap
->id
, qc
->tf
.protocol
, status
);
4305 /* ack bmdma irq events */
4306 ap
->ops
->irq_clear(ap
);
4308 /* complete taskfile transaction */
4309 qc
->err_mask
|= ac_err_mask(status
);
4310 ata_qc_complete(qc
);
4317 return 1; /* irq handled */
4320 ap
->stats
.idle_irq
++;
4323 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4324 ata_irq_ack(ap
, 0); /* debug trap */
4325 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4329 return 0; /* irq not handled */
4333 * ata_interrupt - Default ATA host interrupt handler
4334 * @irq: irq line (unused)
4335 * @dev_instance: pointer to our ata_host_set information structure
4338 * Default interrupt handler for PCI IDE devices. Calls
4339 * ata_host_intr() for each port that is not disabled.
4342 * Obtains host_set lock during operation.
4345 * IRQ_NONE or IRQ_HANDLED.
4348 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4350 struct ata_host_set
*host_set
= dev_instance
;
4352 unsigned int handled
= 0;
4353 unsigned long flags
;
4355 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4356 spin_lock_irqsave(&host_set
->lock
, flags
);
4358 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4359 struct ata_port
*ap
;
4361 ap
= host_set
->ports
[i
];
4363 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4364 struct ata_queued_cmd
*qc
;
4366 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4367 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4368 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4369 handled
|= ata_host_intr(ap
, qc
);
4373 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4375 return IRQ_RETVAL(handled
);
4380 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4381 * without filling any other registers
4383 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4386 struct ata_taskfile tf
;
4389 ata_tf_init(ap
, &tf
, dev
->devno
);
4392 tf
.flags
|= ATA_TFLAG_DEVICE
;
4393 tf
.protocol
= ATA_PROT_NODATA
;
4395 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4397 printk(KERN_ERR
"%s: ata command failed: %d\n",
4403 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4407 if (!ata_try_flush_cache(dev
))
4410 if (ata_id_has_flush_ext(dev
->id
))
4411 cmd
= ATA_CMD_FLUSH_EXT
;
4413 cmd
= ATA_CMD_FLUSH
;
4415 return ata_do_simple_cmd(ap
, dev
, cmd
);
4418 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4420 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4423 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4425 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4429 * ata_device_resume - wakeup a previously suspended devices
4430 * @ap: port the device is connected to
4431 * @dev: the device to resume
4433 * Kick the drive back into action, by sending it an idle immediate
4434 * command and making sure its transfer mode matches between drive
4438 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4440 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4441 struct ata_device
*failed_dev
;
4442 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4443 while (ata_set_mode(ap
, &failed_dev
))
4444 ata_dev_disable(ap
, failed_dev
);
4446 if (!ata_dev_enabled(dev
))
4448 if (dev
->class == ATA_DEV_ATA
)
4449 ata_start_drive(ap
, dev
);
4455 * ata_device_suspend - prepare a device for suspend
4456 * @ap: port the device is connected to
4457 * @dev: the device to suspend
4459 * Flush the cache on the drive, if appropriate, then issue a
4460 * standbynow command.
4462 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4464 if (!ata_dev_enabled(dev
))
4466 if (dev
->class == ATA_DEV_ATA
)
4467 ata_flush_cache(ap
, dev
);
4469 if (state
.event
!= PM_EVENT_FREEZE
)
4470 ata_standby_drive(ap
, dev
);
4471 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4476 * ata_port_start - Set port up for dma.
4477 * @ap: Port to initialize
4479 * Called just after data structures for each port are
4480 * initialized. Allocates space for PRD table.
4482 * May be used as the port_start() entry in ata_port_operations.
4485 * Inherited from caller.
4488 int ata_port_start (struct ata_port
*ap
)
4490 struct device
*dev
= ap
->dev
;
4493 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4497 rc
= ata_pad_alloc(ap
, dev
);
4499 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4503 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4510 * ata_port_stop - Undo ata_port_start()
4511 * @ap: Port to shut down
4513 * Frees the PRD table.
4515 * May be used as the port_stop() entry in ata_port_operations.
4518 * Inherited from caller.
4521 void ata_port_stop (struct ata_port
*ap
)
4523 struct device
*dev
= ap
->dev
;
4525 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4526 ata_pad_free(ap
, dev
);
4529 void ata_host_stop (struct ata_host_set
*host_set
)
4531 if (host_set
->mmio_base
)
4532 iounmap(host_set
->mmio_base
);
4537 * ata_host_remove - Unregister SCSI host structure with upper layers
4538 * @ap: Port to unregister
4539 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4542 * Inherited from caller.
4545 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4547 struct Scsi_Host
*sh
= ap
->host
;
4552 scsi_remove_host(sh
);
4554 ap
->ops
->port_stop(ap
);
4558 * ata_host_init - Initialize an ata_port structure
4559 * @ap: Structure to initialize
4560 * @host: associated SCSI mid-layer structure
4561 * @host_set: Collection of hosts to which @ap belongs
4562 * @ent: Probe information provided by low-level driver
4563 * @port_no: Port number associated with this ata_port
4565 * Initialize a new ata_port structure, and its associated
4569 * Inherited from caller.
4572 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4573 struct ata_host_set
*host_set
,
4574 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4580 host
->max_channel
= 1;
4581 host
->unique_id
= ata_unique_id
++;
4582 host
->max_cmd_len
= 12;
4584 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4585 ap
->id
= host
->unique_id
;
4587 ap
->ctl
= ATA_DEVCTL_OBS
;
4588 ap
->host_set
= host_set
;
4590 ap
->port_no
= port_no
;
4592 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4593 ap
->pio_mask
= ent
->pio_mask
;
4594 ap
->mwdma_mask
= ent
->mwdma_mask
;
4595 ap
->udma_mask
= ent
->udma_mask
;
4596 ap
->flags
|= ent
->host_flags
;
4597 ap
->ops
= ent
->port_ops
;
4598 ap
->cbl
= ATA_CBL_NONE
;
4599 ap
->sata_spd_limit
= UINT_MAX
;
4600 ap
->active_tag
= ATA_TAG_POISON
;
4601 ap
->last_ctl
= 0xFF;
4603 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4604 INIT_LIST_HEAD(&ap
->eh_done_q
);
4606 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4607 struct ata_device
*dev
= &ap
->device
[i
];
4609 dev
->pio_mask
= UINT_MAX
;
4610 dev
->mwdma_mask
= UINT_MAX
;
4611 dev
->udma_mask
= UINT_MAX
;
4615 ap
->stats
.unhandled_irq
= 1;
4616 ap
->stats
.idle_irq
= 1;
4619 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4623 * ata_host_add - Attach low-level ATA driver to system
4624 * @ent: Information provided by low-level driver
4625 * @host_set: Collections of ports to which we add
4626 * @port_no: Port number associated with this host
4628 * Attach low-level ATA driver to system.
4631 * PCI/etc. bus probe sem.
4634 * New ata_port on success, for NULL on error.
4637 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4638 struct ata_host_set
*host_set
,
4639 unsigned int port_no
)
4641 struct Scsi_Host
*host
;
4642 struct ata_port
*ap
;
4647 if (!ent
->port_ops
->probe_reset
&&
4648 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4649 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4654 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4658 host
->transportt
= &ata_scsi_transport_template
;
4660 ap
= (struct ata_port
*) &host
->hostdata
[0];
4662 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4664 rc
= ap
->ops
->port_start(ap
);
4671 scsi_host_put(host
);
4676 * ata_device_add - Register hardware device with ATA and SCSI layers
4677 * @ent: Probe information describing hardware device to be registered
4679 * This function processes the information provided in the probe
4680 * information struct @ent, allocates the necessary ATA and SCSI
4681 * host information structures, initializes them, and registers
4682 * everything with requisite kernel subsystems.
4684 * This function requests irqs, probes the ATA bus, and probes
4688 * PCI/etc. bus probe sem.
4691 * Number of ports registered. Zero on error (no ports registered).
4694 int ata_device_add(const struct ata_probe_ent
*ent
)
4696 unsigned int count
= 0, i
;
4697 struct device
*dev
= ent
->dev
;
4698 struct ata_host_set
*host_set
;
4701 /* alloc a container for our list of ATA ports (buses) */
4702 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4703 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4706 spin_lock_init(&host_set
->lock
);
4708 host_set
->dev
= dev
;
4709 host_set
->n_ports
= ent
->n_ports
;
4710 host_set
->irq
= ent
->irq
;
4711 host_set
->mmio_base
= ent
->mmio_base
;
4712 host_set
->private_data
= ent
->private_data
;
4713 host_set
->ops
= ent
->port_ops
;
4714 host_set
->flags
= ent
->host_set_flags
;
4716 /* register each port bound to this device */
4717 for (i
= 0; i
< ent
->n_ports
; i
++) {
4718 struct ata_port
*ap
;
4719 unsigned long xfer_mode_mask
;
4721 ap
= ata_host_add(ent
, host_set
, i
);
4725 host_set
->ports
[i
] = ap
;
4726 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4727 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4728 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4730 /* print per-port info to dmesg */
4731 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4732 "bmdma 0x%lX irq %lu\n",
4734 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4735 ata_mode_string(xfer_mode_mask
),
4736 ap
->ioaddr
.cmd_addr
,
4737 ap
->ioaddr
.ctl_addr
,
4738 ap
->ioaddr
.bmdma_addr
,
4742 host_set
->ops
->irq_clear(ap
);
4749 /* obtain irq, that is shared between channels */
4750 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4751 DRV_NAME
, host_set
))
4754 /* perform each probe synchronously */
4755 DPRINTK("probe begin\n");
4756 for (i
= 0; i
< count
; i
++) {
4757 struct ata_port
*ap
;
4760 ap
= host_set
->ports
[i
];
4762 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4763 rc
= ata_bus_probe(ap
);
4764 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4767 /* FIXME: do something useful here?
4768 * Current libata behavior will
4769 * tear down everything when
4770 * the module is removed
4771 * or the h/w is unplugged.
4775 rc
= scsi_add_host(ap
->host
, dev
);
4777 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4779 /* FIXME: do something useful here */
4780 /* FIXME: handle unconditional calls to
4781 * scsi_scan_host and ata_host_remove, below,
4787 /* probes are done, now scan each port's disk(s) */
4788 DPRINTK("host probe begin\n");
4789 for (i
= 0; i
< count
; i
++) {
4790 struct ata_port
*ap
= host_set
->ports
[i
];
4792 ata_scsi_scan_host(ap
);
4795 dev_set_drvdata(dev
, host_set
);
4797 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4798 return ent
->n_ports
; /* success */
4801 for (i
= 0; i
< count
; i
++) {
4802 ata_host_remove(host_set
->ports
[i
], 1);
4803 scsi_host_put(host_set
->ports
[i
]->host
);
4807 VPRINTK("EXIT, returning 0\n");
4812 * ata_host_set_remove - PCI layer callback for device removal
4813 * @host_set: ATA host set that was removed
4815 * Unregister all objects associated with this host set. Free those
4819 * Inherited from calling layer (may sleep).
4822 void ata_host_set_remove(struct ata_host_set
*host_set
)
4824 struct ata_port
*ap
;
4827 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4828 ap
= host_set
->ports
[i
];
4829 scsi_remove_host(ap
->host
);
4832 free_irq(host_set
->irq
, host_set
);
4834 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4835 ap
= host_set
->ports
[i
];
4837 ata_scsi_release(ap
->host
);
4839 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4840 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4842 if (ioaddr
->cmd_addr
== 0x1f0)
4843 release_region(0x1f0, 8);
4844 else if (ioaddr
->cmd_addr
== 0x170)
4845 release_region(0x170, 8);
4848 scsi_host_put(ap
->host
);
4851 if (host_set
->ops
->host_stop
)
4852 host_set
->ops
->host_stop(host_set
);
4858 * ata_scsi_release - SCSI layer callback hook for host unload
4859 * @host: libata host to be unloaded
4861 * Performs all duties necessary to shut down a libata port...
4862 * Kill port kthread, disable port, and release resources.
4865 * Inherited from SCSI layer.
4871 int ata_scsi_release(struct Scsi_Host
*host
)
4873 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4878 ap
->ops
->port_disable(ap
);
4879 ata_host_remove(ap
, 0);
4880 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4881 kfree(ap
->device
[i
].id
);
4888 * ata_std_ports - initialize ioaddr with standard port offsets.
4889 * @ioaddr: IO address structure to be initialized
4891 * Utility function which initializes data_addr, error_addr,
4892 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4893 * device_addr, status_addr, and command_addr to standard offsets
4894 * relative to cmd_addr.
4896 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4899 void ata_std_ports(struct ata_ioports
*ioaddr
)
4901 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4902 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4903 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4904 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4905 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4906 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4907 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4908 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4909 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4910 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4916 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4918 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4920 pci_iounmap(pdev
, host_set
->mmio_base
);
4924 * ata_pci_remove_one - PCI layer callback for device removal
4925 * @pdev: PCI device that was removed
4927 * PCI layer indicates to libata via this hook that
4928 * hot-unplug or module unload event has occurred.
4929 * Handle this by unregistering all objects associated
4930 * with this PCI device. Free those objects. Then finally
4931 * release PCI resources and disable device.
4934 * Inherited from PCI layer (may sleep).
4937 void ata_pci_remove_one (struct pci_dev
*pdev
)
4939 struct device
*dev
= pci_dev_to_dev(pdev
);
4940 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4942 ata_host_set_remove(host_set
);
4943 pci_release_regions(pdev
);
4944 pci_disable_device(pdev
);
4945 dev_set_drvdata(dev
, NULL
);
4948 /* move to PCI subsystem */
4949 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4951 unsigned long tmp
= 0;
4953 switch (bits
->width
) {
4956 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4962 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4968 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4979 return (tmp
== bits
->val
) ? 1 : 0;
4982 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4984 pci_save_state(pdev
);
4985 pci_disable_device(pdev
);
4986 pci_set_power_state(pdev
, PCI_D3hot
);
4990 int ata_pci_device_resume(struct pci_dev
*pdev
)
4992 pci_set_power_state(pdev
, PCI_D0
);
4993 pci_restore_state(pdev
);
4994 pci_enable_device(pdev
);
4995 pci_set_master(pdev
);
4998 #endif /* CONFIG_PCI */
5001 static int __init
ata_init(void)
5003 ata_wq
= create_workqueue("ata");
5007 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5011 static void __exit
ata_exit(void)
5013 destroy_workqueue(ata_wq
);
5016 module_init(ata_init
);
5017 module_exit(ata_exit
);
5019 static unsigned long ratelimit_time
;
5020 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5022 int ata_ratelimit(void)
5025 unsigned long flags
;
5027 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5029 if (time_after(jiffies
, ratelimit_time
)) {
5031 ratelimit_time
= jiffies
+ (HZ
/5);
5035 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5041 * libata is essentially a library of internal helper functions for
5042 * low-level ATA host controller drivers. As such, the API/ABI is
5043 * likely to change as new drivers are added and updated.
5044 * Do not depend on ABI/API stability.
5047 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5048 EXPORT_SYMBOL_GPL(ata_std_ports
);
5049 EXPORT_SYMBOL_GPL(ata_device_add
);
5050 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5051 EXPORT_SYMBOL_GPL(ata_sg_init
);
5052 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5053 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5054 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5055 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5056 EXPORT_SYMBOL_GPL(ata_tf_load
);
5057 EXPORT_SYMBOL_GPL(ata_tf_read
);
5058 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5059 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5060 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5061 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5062 EXPORT_SYMBOL_GPL(ata_check_status
);
5063 EXPORT_SYMBOL_GPL(ata_altstatus
);
5064 EXPORT_SYMBOL_GPL(ata_exec_command
);
5065 EXPORT_SYMBOL_GPL(ata_port_start
);
5066 EXPORT_SYMBOL_GPL(ata_port_stop
);
5067 EXPORT_SYMBOL_GPL(ata_host_stop
);
5068 EXPORT_SYMBOL_GPL(ata_interrupt
);
5069 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5070 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5071 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5072 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5073 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5074 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5075 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5076 EXPORT_SYMBOL_GPL(ata_port_probe
);
5077 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5078 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5079 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5080 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5081 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5082 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5083 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5084 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5085 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5086 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5087 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5088 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5089 EXPORT_SYMBOL_GPL(ata_port_disable
);
5090 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5091 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5092 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5093 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5094 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5095 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5096 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5097 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5098 EXPORT_SYMBOL_GPL(ata_host_intr
);
5099 EXPORT_SYMBOL_GPL(ata_id_string
);
5100 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5101 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5102 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5103 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5105 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5106 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5107 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5110 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5111 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5112 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5113 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5114 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5115 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5116 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5117 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5118 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5119 #endif /* CONFIG_PCI */
5121 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5122 EXPORT_SYMBOL_GPL(ata_device_resume
);
5123 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5124 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);