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_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
70 static int ata_down_sata_spd_limit(struct ata_port
*ap
);
71 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
);
72 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
73 struct ata_device
*dev
);
74 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
76 static unsigned int ata_unique_id
= 1;
77 static struct workqueue_struct
*ata_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param_named(fua
, libata_fua
, int, 0444);
85 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
87 MODULE_AUTHOR("Jeff Garzik");
88 MODULE_DESCRIPTION("Library module for ATA devices");
89 MODULE_LICENSE("GPL");
90 MODULE_VERSION(DRV_VERSION
);
94 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
95 * @tf: Taskfile to convert
96 * @fis: Buffer into which data will output
97 * @pmp: Port multiplier port
99 * Converts a standard ATA taskfile to a Serial ATA
100 * FIS structure (Register - Host to Device).
103 * Inherited from caller.
106 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
108 fis
[0] = 0x27; /* Register - Host to Device FIS */
109 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
110 bit 7 indicates Command FIS */
111 fis
[2] = tf
->command
;
112 fis
[3] = tf
->feature
;
119 fis
[8] = tf
->hob_lbal
;
120 fis
[9] = tf
->hob_lbam
;
121 fis
[10] = tf
->hob_lbah
;
122 fis
[11] = tf
->hob_feature
;
125 fis
[13] = tf
->hob_nsect
;
136 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
137 * @fis: Buffer from which data will be input
138 * @tf: Taskfile to output
140 * Converts a serial ATA FIS structure to a standard ATA taskfile.
143 * Inherited from caller.
146 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
148 tf
->command
= fis
[2]; /* status */
149 tf
->feature
= fis
[3]; /* error */
156 tf
->hob_lbal
= fis
[8];
157 tf
->hob_lbam
= fis
[9];
158 tf
->hob_lbah
= fis
[10];
161 tf
->hob_nsect
= fis
[13];
164 static const u8 ata_rw_cmds
[] = {
168 ATA_CMD_READ_MULTI_EXT
,
169 ATA_CMD_WRITE_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_FUA_EXT
,
177 ATA_CMD_PIO_READ_EXT
,
178 ATA_CMD_PIO_WRITE_EXT
,
191 ATA_CMD_WRITE_FUA_EXT
195 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
196 * @qc: command to examine and configure
198 * Examine the device configuration and tf->flags to calculate
199 * the proper read/write commands and protocol to use.
204 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
206 struct ata_taskfile
*tf
= &qc
->tf
;
207 struct ata_device
*dev
= qc
->dev
;
210 int index
, fua
, lba48
, write
;
212 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
213 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
214 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
216 if (dev
->flags
& ATA_DFLAG_PIO
) {
217 tf
->protocol
= ATA_PROT_PIO
;
218 index
= dev
->multi_count
? 0 : 8;
219 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
220 /* Unable to use DMA due to host limitation */
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
224 tf
->protocol
= ATA_PROT_DMA
;
228 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
237 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
238 * @pio_mask: pio_mask
239 * @mwdma_mask: mwdma_mask
240 * @udma_mask: udma_mask
242 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
243 * unsigned int xfer_mask.
251 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
252 unsigned int mwdma_mask
,
253 unsigned int udma_mask
)
255 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
256 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
257 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
261 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
262 * @xfer_mask: xfer_mask to unpack
263 * @pio_mask: resulting pio_mask
264 * @mwdma_mask: resulting mwdma_mask
265 * @udma_mask: resulting udma_mask
267 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
268 * Any NULL distination masks will be ignored.
270 static void ata_unpack_xfermask(unsigned int xfer_mask
,
271 unsigned int *pio_mask
,
272 unsigned int *mwdma_mask
,
273 unsigned int *udma_mask
)
276 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
278 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
280 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
283 static const struct ata_xfer_ent
{
287 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
288 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
289 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
294 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
295 * @xfer_mask: xfer_mask of interest
297 * Return matching XFER_* value for @xfer_mask. Only the highest
298 * bit of @xfer_mask is considered.
304 * Matching XFER_* value, 0 if no match found.
306 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
308 int highbit
= fls(xfer_mask
) - 1;
309 const struct ata_xfer_ent
*ent
;
311 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
312 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
313 return ent
->base
+ highbit
- ent
->shift
;
318 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
319 * @xfer_mode: XFER_* of interest
321 * Return matching xfer_mask for @xfer_mode.
327 * Matching xfer_mask, 0 if no match found.
329 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
331 const struct ata_xfer_ent
*ent
;
333 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
334 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
335 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
340 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
341 * @xfer_mode: XFER_* of interest
343 * Return matching xfer_shift for @xfer_mode.
349 * Matching xfer_shift, -1 if no match found.
351 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
353 const struct ata_xfer_ent
*ent
;
355 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
356 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
362 * ata_mode_string - convert xfer_mask to string
363 * @xfer_mask: mask of bits supported; only highest bit counts.
365 * Determine string which represents the highest speed
366 * (highest bit in @modemask).
372 * Constant C string representing highest speed listed in
373 * @mode_mask, or the constant C string "<n/a>".
375 static const char *ata_mode_string(unsigned int xfer_mask
)
377 static const char * const xfer_mode_str
[] = {
397 highbit
= fls(xfer_mask
) - 1;
398 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
399 return xfer_mode_str
[highbit
];
403 static const char *sata_spd_string(unsigned int spd
)
405 static const char * const spd_str
[] = {
410 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
412 return spd_str
[spd
- 1];
415 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
417 if (ata_dev_enabled(dev
)) {
418 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
425 * ata_pio_devchk - PATA device presence detection
426 * @ap: ATA channel to examine
427 * @device: Device to examine (starting at zero)
429 * This technique was originally described in
430 * Hale Landis's ATADRVR (www.ata-atapi.com), and
431 * later found its way into the ATA/ATAPI spec.
433 * Write a pattern to the ATA shadow registers,
434 * and if a device is present, it will respond by
435 * correctly storing and echoing back the
436 * ATA shadow register contents.
442 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
445 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
448 ap
->ops
->dev_select(ap
, device
);
450 outb(0x55, ioaddr
->nsect_addr
);
451 outb(0xaa, ioaddr
->lbal_addr
);
453 outb(0xaa, ioaddr
->nsect_addr
);
454 outb(0x55, ioaddr
->lbal_addr
);
456 outb(0x55, ioaddr
->nsect_addr
);
457 outb(0xaa, ioaddr
->lbal_addr
);
459 nsect
= inb(ioaddr
->nsect_addr
);
460 lbal
= inb(ioaddr
->lbal_addr
);
462 if ((nsect
== 0x55) && (lbal
== 0xaa))
463 return 1; /* we found a device */
465 return 0; /* nothing found */
469 * ata_mmio_devchk - PATA device presence detection
470 * @ap: ATA channel to examine
471 * @device: Device to examine (starting at zero)
473 * This technique was originally described in
474 * Hale Landis's ATADRVR (www.ata-atapi.com), and
475 * later found its way into the ATA/ATAPI spec.
477 * Write a pattern to the ATA shadow registers,
478 * and if a device is present, it will respond by
479 * correctly storing and echoing back the
480 * ATA shadow register contents.
486 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
489 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
492 ap
->ops
->dev_select(ap
, device
);
494 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
495 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
503 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
504 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
506 if ((nsect
== 0x55) && (lbal
== 0xaa))
507 return 1; /* we found a device */
509 return 0; /* nothing found */
513 * ata_devchk - PATA device presence detection
514 * @ap: ATA channel to examine
515 * @device: Device to examine (starting at zero)
517 * Dispatch ATA device presence detection, depending
518 * on whether we are using PIO or MMIO to talk to the
519 * ATA shadow registers.
525 static unsigned int ata_devchk(struct ata_port
*ap
,
528 if (ap
->flags
& ATA_FLAG_MMIO
)
529 return ata_mmio_devchk(ap
, device
);
530 return ata_pio_devchk(ap
, device
);
534 * ata_dev_classify - determine device type based on ATA-spec signature
535 * @tf: ATA taskfile register set for device to be identified
537 * Determine from taskfile register contents whether a device is
538 * ATA or ATAPI, as per "Signature and persistence" section
539 * of ATA/PI spec (volume 1, sect 5.14).
545 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
546 * the event of failure.
549 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
551 /* Apple's open source Darwin code hints that some devices only
552 * put a proper signature into the LBA mid/high registers,
553 * So, we only check those. It's sufficient for uniqueness.
556 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
557 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
558 DPRINTK("found ATA device by sig\n");
562 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
563 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
564 DPRINTK("found ATAPI device by sig\n");
565 return ATA_DEV_ATAPI
;
568 DPRINTK("unknown device\n");
569 return ATA_DEV_UNKNOWN
;
573 * ata_dev_try_classify - Parse returned ATA device signature
574 * @ap: ATA channel to examine
575 * @device: Device to examine (starting at zero)
576 * @r_err: Value of error register on completion
578 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
579 * an ATA/ATAPI-defined set of values is placed in the ATA
580 * shadow registers, indicating the results of device detection
583 * Select the ATA device, and read the values from the ATA shadow
584 * registers. Then parse according to the Error register value,
585 * and the spec-defined values examined by ata_dev_classify().
591 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
595 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
597 struct ata_taskfile tf
;
601 ap
->ops
->dev_select(ap
, device
);
603 memset(&tf
, 0, sizeof(tf
));
605 ap
->ops
->tf_read(ap
, &tf
);
610 /* see if device passed diags */
613 else if ((device
== 0) && (err
== 0x81))
618 /* determine if device is ATA or ATAPI */
619 class = ata_dev_classify(&tf
);
621 if (class == ATA_DEV_UNKNOWN
)
623 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
629 * ata_id_string - Convert IDENTIFY DEVICE page into string
630 * @id: IDENTIFY DEVICE results we will examine
631 * @s: string into which data is output
632 * @ofs: offset into identify device page
633 * @len: length of string to return. must be an even number.
635 * The strings in the IDENTIFY DEVICE page are broken up into
636 * 16-bit chunks. Run through the string, and output each
637 * 8-bit chunk linearly, regardless of platform.
643 void ata_id_string(const u16
*id
, unsigned char *s
,
644 unsigned int ofs
, unsigned int len
)
663 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
664 * @id: IDENTIFY DEVICE results we will examine
665 * @s: string into which data is output
666 * @ofs: offset into identify device page
667 * @len: length of string to return. must be an odd number.
669 * This function is identical to ata_id_string except that it
670 * trims trailing spaces and terminates the resulting string with
671 * null. @len must be actual maximum length (even number) + 1.
676 void ata_id_c_string(const u16
*id
, unsigned char *s
,
677 unsigned int ofs
, unsigned int len
)
683 ata_id_string(id
, s
, ofs
, len
- 1);
685 p
= s
+ strnlen(s
, len
- 1);
686 while (p
> s
&& p
[-1] == ' ')
691 static u64
ata_id_n_sectors(const u16
*id
)
693 if (ata_id_has_lba(id
)) {
694 if (ata_id_has_lba48(id
))
695 return ata_id_u64(id
, 100);
697 return ata_id_u32(id
, 60);
699 if (ata_id_current_chs_valid(id
))
700 return ata_id_u32(id
, 57);
702 return id
[1] * id
[3] * id
[6];
707 * ata_noop_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * This function performs no actual function.
713 * May be used as the dev_select() entry in ata_port_operations.
718 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
724 * ata_std_dev_select - Select device 0/1 on ATA bus
725 * @ap: ATA channel to manipulate
726 * @device: ATA device (numbered from zero) to select
728 * Use the method defined in the ATA specification to
729 * make either device 0, or device 1, active on the
730 * ATA channel. Works with both PIO and MMIO.
732 * May be used as the dev_select() entry in ata_port_operations.
738 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
743 tmp
= ATA_DEVICE_OBS
;
745 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
747 if (ap
->flags
& ATA_FLAG_MMIO
) {
748 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
750 outb(tmp
, ap
->ioaddr
.device_addr
);
752 ata_pause(ap
); /* needed; also flushes, for mmio */
756 * ata_dev_select - Select device 0/1 on ATA bus
757 * @ap: ATA channel to manipulate
758 * @device: ATA device (numbered from zero) to select
759 * @wait: non-zero to wait for Status register BSY bit to clear
760 * @can_sleep: non-zero if context allows sleeping
762 * Use the method defined in the ATA specification to
763 * make either device 0, or device 1, active on the
766 * This is a high-level version of ata_std_dev_select(),
767 * which additionally provides the services of inserting
768 * the proper pauses and status polling, where needed.
774 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
775 unsigned int wait
, unsigned int can_sleep
)
777 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
778 ap
->id
, device
, wait
);
783 ap
->ops
->dev_select(ap
, device
);
786 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
793 * ata_dump_id - IDENTIFY DEVICE info debugging output
794 * @id: IDENTIFY DEVICE page to dump
796 * Dump selected 16-bit words from the given IDENTIFY DEVICE
803 static inline void ata_dump_id(const u16
*id
)
805 DPRINTK("49==0x%04x "
815 DPRINTK("80==0x%04x "
825 DPRINTK("88==0x%04x "
832 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
833 * @id: IDENTIFY data to compute xfer mask from
835 * Compute the xfermask for this device. This is not as trivial
836 * as it seems if we must consider early devices correctly.
838 * FIXME: pre IDE drive timing (do we care ?).
846 static unsigned int ata_id_xfermask(const u16
*id
)
848 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
850 /* Usual case. Word 53 indicates word 64 is valid */
851 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
852 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
856 /* If word 64 isn't valid then Word 51 high byte holds
857 * the PIO timing number for the maximum. Turn it into
860 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
862 /* But wait.. there's more. Design your standards by
863 * committee and you too can get a free iordy field to
864 * process. However its the speeds not the modes that
865 * are supported... Note drivers using the timing API
866 * will get this right anyway
870 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
873 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
874 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
876 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
880 * ata_port_queue_task - Queue port_task
881 * @ap: The ata_port to queue port_task for
883 * Schedule @fn(@data) for execution after @delay jiffies using
884 * port_task. There is one port_task per port and it's the
885 * user(low level driver)'s responsibility to make sure that only
886 * one task is active at any given time.
888 * libata core layer takes care of synchronization between
889 * port_task and EH. ata_port_queue_task() may be ignored for EH
893 * Inherited from caller.
895 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
900 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
903 PREPARE_WORK(&ap
->port_task
, fn
, data
);
906 rc
= queue_work(ata_wq
, &ap
->port_task
);
908 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
910 /* rc == 0 means that another user is using port task */
915 * ata_port_flush_task - Flush port_task
916 * @ap: The ata_port to flush port_task for
918 * After this function completes, port_task is guranteed not to
919 * be running or scheduled.
922 * Kernel thread context (may sleep)
924 void ata_port_flush_task(struct ata_port
*ap
)
930 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
931 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
932 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
934 DPRINTK("flush #1\n");
935 flush_workqueue(ata_wq
);
938 * At this point, if a task is running, it's guaranteed to see
939 * the FLUSH flag; thus, it will never queue pio tasks again.
942 if (!cancel_delayed_work(&ap
->port_task
)) {
943 DPRINTK("flush #2\n");
944 flush_workqueue(ata_wq
);
947 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
948 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
949 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
954 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
956 struct completion
*waiting
= qc
->private_data
;
958 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
963 * ata_exec_internal - execute libata internal command
964 * @ap: Port to which the command is sent
965 * @dev: Device to which the command is sent
966 * @tf: Taskfile registers for the command and the result
967 * @dma_dir: Data tranfer direction of the command
968 * @buf: Data buffer of the command
969 * @buflen: Length of data buffer
971 * Executes libata internal command with timeout. @tf contains
972 * command on entry and result on return. Timeout and error
973 * conditions are reported via return value. No recovery action
974 * is taken after a command times out. It's caller's duty to
975 * clean up after timeout.
978 * None. Should be called with kernel context, might sleep.
982 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
983 struct ata_taskfile
*tf
,
984 int dma_dir
, void *buf
, unsigned int buflen
)
986 u8 command
= tf
->command
;
987 struct ata_queued_cmd
*qc
;
988 DECLARE_COMPLETION(wait
);
990 unsigned int err_mask
;
992 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
994 qc
= ata_qc_new_init(ap
, dev
);
998 qc
->dma_dir
= dma_dir
;
999 if (dma_dir
!= DMA_NONE
) {
1000 ata_sg_init_one(qc
, buf
, buflen
);
1001 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1004 qc
->private_data
= &wait
;
1005 qc
->complete_fn
= ata_qc_complete_internal
;
1009 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1011 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1012 ata_port_flush_task(ap
);
1014 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1016 /* We're racing with irq here. If we lose, the
1017 * following test prevents us from completing the qc
1018 * again. If completion irq occurs after here but
1019 * before the caller cleans up, it will result in a
1020 * spurious interrupt. We can live with that.
1022 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1023 qc
->err_mask
= AC_ERR_TIMEOUT
;
1024 ata_qc_complete(qc
);
1025 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1029 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1033 err_mask
= qc
->err_mask
;
1037 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1038 * Until those drivers are fixed, we detect the condition
1039 * here, fail the command with AC_ERR_SYSTEM and reenable the
1042 * Note that this doesn't change any behavior as internal
1043 * command failure results in disabling the device in the
1044 * higher layer for LLDDs without new reset/EH callbacks.
1046 * Kill the following code as soon as those drivers are fixed.
1048 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1049 err_mask
|= AC_ERR_SYSTEM
;
1057 * ata_pio_need_iordy - check if iordy needed
1060 * Check if the current speed of the device requires IORDY. Used
1061 * by various controllers for chip configuration.
1064 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1067 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1074 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1076 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1077 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1078 /* Is the speed faster than the drive allows non IORDY ? */
1080 /* This is cycle times not frequency - watch the logic! */
1081 if (pio
> 240) /* PIO2 is 240nS per cycle */
1090 * ata_dev_read_id - Read ID data from the specified device
1091 * @ap: port on which target device resides
1092 * @dev: target device
1093 * @p_class: pointer to class of the target device (may be changed)
1094 * @post_reset: is this read ID post-reset?
1095 * @p_id: read IDENTIFY page (newly allocated)
1097 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1098 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1099 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1100 * for pre-ATA4 drives.
1103 * Kernel thread context (may sleep)
1106 * 0 on success, -errno otherwise.
1108 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1109 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1111 unsigned int class = *p_class
;
1112 struct ata_taskfile tf
;
1113 unsigned int err_mask
= 0;
1118 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1120 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1122 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1125 reason
= "out of memory";
1130 ata_tf_init(ap
, &tf
, dev
->devno
);
1134 tf
.command
= ATA_CMD_ID_ATA
;
1137 tf
.command
= ATA_CMD_ID_ATAPI
;
1141 reason
= "unsupported class";
1145 tf
.protocol
= ATA_PROT_PIO
;
1147 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1148 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1151 reason
= "I/O error";
1155 swap_buf_le16(id
, ATA_ID_WORDS
);
1158 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1160 reason
= "device reports illegal type";
1164 if (post_reset
&& class == ATA_DEV_ATA
) {
1166 * The exact sequence expected by certain pre-ATA4 drives is:
1169 * INITIALIZE DEVICE PARAMETERS
1171 * Some drives were very specific about that exact sequence.
1173 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1174 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1177 reason
= "INIT_DEV_PARAMS failed";
1181 /* current CHS translation info (id[53-58]) might be
1182 * changed. reread the identify device info.
1194 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1195 ap
->id
, dev
->devno
, reason
);
1200 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1201 struct ata_device
*dev
)
1203 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1207 * ata_dev_configure - Configure the specified ATA/ATAPI device
1208 * @ap: Port on which target device resides
1209 * @dev: Target device to configure
1210 * @print_info: Enable device info printout
1212 * Configure @dev according to @dev->id. Generic and low-level
1213 * driver specific fixups are also applied.
1216 * Kernel thread context (may sleep)
1219 * 0 on success, -errno otherwise
1221 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1224 const u16
*id
= dev
->id
;
1225 unsigned int xfer_mask
;
1228 if (!ata_dev_enabled(dev
)) {
1229 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1230 ap
->id
, dev
->devno
);
1234 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1236 /* print device capabilities */
1238 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1239 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1240 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1241 id
[84], id
[85], id
[86], id
[87], id
[88]);
1243 /* initialize to-be-configured parameters */
1245 dev
->max_sectors
= 0;
1253 * common ATA, ATAPI feature tests
1256 /* find max transfer mode; for printk only */
1257 xfer_mask
= ata_id_xfermask(id
);
1261 /* ATA-specific feature tests */
1262 if (dev
->class == ATA_DEV_ATA
) {
1263 dev
->n_sectors
= ata_id_n_sectors(id
);
1265 if (ata_id_has_lba(id
)) {
1266 const char *lba_desc
;
1269 dev
->flags
|= ATA_DFLAG_LBA
;
1270 if (ata_id_has_lba48(id
)) {
1271 dev
->flags
|= ATA_DFLAG_LBA48
;
1275 /* print device info to dmesg */
1277 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1278 "max %s, %Lu sectors: %s\n",
1280 ata_id_major_version(id
),
1281 ata_mode_string(xfer_mask
),
1282 (unsigned long long)dev
->n_sectors
,
1287 /* Default translation */
1288 dev
->cylinders
= id
[1];
1290 dev
->sectors
= id
[6];
1292 if (ata_id_current_chs_valid(id
)) {
1293 /* Current CHS translation is valid. */
1294 dev
->cylinders
= id
[54];
1295 dev
->heads
= id
[55];
1296 dev
->sectors
= id
[56];
1299 /* print device info to dmesg */
1301 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1302 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1304 ata_id_major_version(id
),
1305 ata_mode_string(xfer_mask
),
1306 (unsigned long long)dev
->n_sectors
,
1307 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1313 /* ATAPI-specific feature tests */
1314 else if (dev
->class == ATA_DEV_ATAPI
) {
1315 rc
= atapi_cdb_len(id
);
1316 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1317 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1321 dev
->cdb_len
= (unsigned int) rc
;
1323 /* print device info to dmesg */
1325 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1326 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1329 ap
->host
->max_cmd_len
= 0;
1330 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1331 ap
->host
->max_cmd_len
= max_t(unsigned int,
1332 ap
->host
->max_cmd_len
,
1333 ap
->device
[i
].cdb_len
);
1335 /* limit bridge transfers to udma5, 200 sectors */
1336 if (ata_dev_knobble(ap
, dev
)) {
1338 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1339 ap
->id
, dev
->devno
);
1340 dev
->udma_mask
&= ATA_UDMA5
;
1341 dev
->max_sectors
= ATA_MAX_SECTORS
;
1344 if (ap
->ops
->dev_config
)
1345 ap
->ops
->dev_config(ap
, dev
);
1347 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1351 DPRINTK("EXIT, err\n");
1356 * ata_bus_probe - Reset and probe ATA bus
1359 * Master ATA bus probing function. Initiates a hardware-dependent
1360 * bus reset, then attempts to identify any devices found on
1364 * PCI/etc. bus probe sem.
1367 * Zero on success, negative errno otherwise.
1370 static int ata_bus_probe(struct ata_port
*ap
)
1372 unsigned int classes
[ATA_MAX_DEVICES
];
1373 int tries
[ATA_MAX_DEVICES
];
1374 int i
, rc
, down_xfermask
;
1375 struct ata_device
*dev
;
1379 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1380 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1385 /* reset and determine device classes */
1386 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1387 classes
[i
] = ATA_DEV_UNKNOWN
;
1389 if (ap
->ops
->probe_reset
) {
1390 rc
= ap
->ops
->probe_reset(ap
, classes
);
1392 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1396 ap
->ops
->phy_reset(ap
);
1398 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1399 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1400 classes
[i
] = ap
->device
[i
].class;
1405 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1406 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1407 classes
[i
] = ATA_DEV_NONE
;
1409 /* read IDENTIFY page and configure devices */
1410 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1411 dev
= &ap
->device
[i
];
1412 dev
->class = classes
[i
];
1415 ata_down_xfermask_limit(ap
, dev
, 1);
1416 ata_dev_disable(ap
, dev
);
1419 if (!ata_dev_enabled(dev
))
1424 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
);
1428 rc
= ata_dev_configure(ap
, dev
, 1);
1433 /* configure transfer mode */
1434 if (ap
->ops
->set_mode
) {
1435 /* FIXME: make ->set_mode handle no device case and
1436 * return error code and failing device on failure as
1437 * ata_set_mode() does.
1439 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1440 if (ata_dev_enabled(&ap
->device
[i
])) {
1441 ap
->ops
->set_mode(ap
);
1446 rc
= ata_set_mode(ap
, &dev
);
1453 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1454 if (ata_dev_enabled(&ap
->device
[i
]))
1457 /* no device present, disable port */
1458 ata_port_disable(ap
);
1459 ap
->ops
->port_disable(ap
);
1466 tries
[dev
->devno
] = 0;
1469 ata_down_sata_spd_limit(ap
);
1472 tries
[dev
->devno
]--;
1473 if (down_xfermask
&&
1474 ata_down_xfermask_limit(ap
, dev
, tries
[dev
->devno
] == 1))
1475 tries
[dev
->devno
] = 0;
1482 * ata_port_probe - Mark port as enabled
1483 * @ap: Port for which we indicate enablement
1485 * Modify @ap data structure such that the system
1486 * thinks that the entire port is enabled.
1488 * LOCKING: host_set lock, or some other form of
1492 void ata_port_probe(struct ata_port
*ap
)
1494 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1498 * sata_print_link_status - Print SATA link status
1499 * @ap: SATA port to printk link status about
1501 * This function prints link speed and status of a SATA link.
1506 static void sata_print_link_status(struct ata_port
*ap
)
1510 if (!ap
->ops
->scr_read
)
1513 sstatus
= scr_read(ap
, SCR_STATUS
);
1515 if (sata_dev_present(ap
)) {
1516 tmp
= (sstatus
>> 4) & 0xf;
1517 printk(KERN_INFO
"ata%u: SATA link up %s (SStatus %X)\n",
1518 ap
->id
, sata_spd_string(tmp
), sstatus
);
1520 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1526 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1527 * @ap: SATA port associated with target SATA PHY.
1529 * This function issues commands to standard SATA Sxxx
1530 * PHY registers, to wake up the phy (and device), and
1531 * clear any reset condition.
1534 * PCI/etc. bus probe sem.
1537 void __sata_phy_reset(struct ata_port
*ap
)
1540 unsigned long timeout
= jiffies
+ (HZ
* 5);
1542 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1543 /* issue phy wake/reset */
1544 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1545 /* Couldn't find anything in SATA I/II specs, but
1546 * AHCI-1.1 10.4.2 says at least 1 ms. */
1549 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1551 /* wait for phy to become ready, if necessary */
1554 sstatus
= scr_read(ap
, SCR_STATUS
);
1555 if ((sstatus
& 0xf) != 1)
1557 } while (time_before(jiffies
, timeout
));
1559 /* print link status */
1560 sata_print_link_status(ap
);
1562 /* TODO: phy layer with polling, timeouts, etc. */
1563 if (sata_dev_present(ap
))
1566 ata_port_disable(ap
);
1568 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1571 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1572 ata_port_disable(ap
);
1576 ap
->cbl
= ATA_CBL_SATA
;
1580 * sata_phy_reset - Reset SATA bus.
1581 * @ap: SATA port associated with target SATA PHY.
1583 * This function resets the SATA bus, and then probes
1584 * the bus for devices.
1587 * PCI/etc. bus probe sem.
1590 void sata_phy_reset(struct ata_port
*ap
)
1592 __sata_phy_reset(ap
);
1593 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1599 * ata_dev_pair - return other device on cable
1603 * Obtain the other device on the same cable, or if none is
1604 * present NULL is returned
1607 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1609 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1610 if (!ata_dev_enabled(pair
))
1616 * ata_port_disable - Disable port.
1617 * @ap: Port to be disabled.
1619 * Modify @ap data structure such that the system
1620 * thinks that the entire port is disabled, and should
1621 * never attempt to probe or communicate with devices
1624 * LOCKING: host_set lock, or some other form of
1628 void ata_port_disable(struct ata_port
*ap
)
1630 ap
->device
[0].class = ATA_DEV_NONE
;
1631 ap
->device
[1].class = ATA_DEV_NONE
;
1632 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1636 * ata_down_sata_spd_limit - adjust SATA spd limit downward
1637 * @ap: Port to adjust SATA spd limit for
1639 * Adjust SATA spd limit of @ap downward. Note that this
1640 * function only adjusts the limit. The change must be applied
1641 * using ata_set_sata_spd().
1644 * Inherited from caller.
1647 * 0 on success, negative errno on failure
1649 static int ata_down_sata_spd_limit(struct ata_port
*ap
)
1654 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1657 mask
= ap
->sata_spd_limit
;
1660 highbit
= fls(mask
) - 1;
1661 mask
&= ~(1 << highbit
);
1663 spd
= (scr_read(ap
, SCR_STATUS
) >> 4) & 0xf;
1667 mask
&= (1 << spd
) - 1;
1671 ap
->sata_spd_limit
= mask
;
1673 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1674 ap
->id
, sata_spd_string(fls(mask
)));
1679 static int __ata_set_sata_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1683 if (ap
->sata_spd_limit
== UINT_MAX
)
1686 limit
= fls(ap
->sata_spd_limit
);
1688 spd
= (*scontrol
>> 4) & 0xf;
1689 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1691 return spd
!= limit
;
1695 * ata_set_sata_spd_needed - is SATA spd configuration needed
1696 * @ap: Port in question
1698 * Test whether the spd limit in SControl matches
1699 * @ap->sata_spd_limit. This function is used to determine
1700 * whether hardreset is necessary to apply SATA spd
1704 * Inherited from caller.
1707 * 1 if SATA spd configuration is needed, 0 otherwise.
1709 static int ata_set_sata_spd_needed(struct ata_port
*ap
)
1713 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1716 scontrol
= scr_read(ap
, SCR_CONTROL
);
1718 return __ata_set_sata_spd_needed(ap
, &scontrol
);
1722 * ata_set_sata_spd - set SATA spd according to spd limit
1723 * @ap: Port to set SATA spd for
1725 * Set SATA spd of @ap according to sata_spd_limit.
1728 * Inherited from caller.
1731 * 0 if spd doesn't need to be changed, 1 if spd has been
1732 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1734 static int ata_set_sata_spd(struct ata_port
*ap
)
1738 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1741 scontrol
= scr_read(ap
, SCR_CONTROL
);
1742 if (!__ata_set_sata_spd_needed(ap
, &scontrol
))
1745 scr_write(ap
, SCR_CONTROL
, scontrol
);
1750 * This mode timing computation functionality is ported over from
1751 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1754 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1755 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1756 * for PIO 5, which is a nonstandard extension and UDMA6, which
1757 * is currently supported only by Maxtor drives.
1760 static const struct ata_timing ata_timing
[] = {
1762 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1763 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1764 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1765 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1767 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1768 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1769 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1771 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1773 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1774 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1775 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1777 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1778 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1779 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1781 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1782 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1783 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1785 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1786 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1787 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1789 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1794 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1795 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1797 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1799 q
->setup
= EZ(t
->setup
* 1000, T
);
1800 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1801 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1802 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1803 q
->active
= EZ(t
->active
* 1000, T
);
1804 q
->recover
= EZ(t
->recover
* 1000, T
);
1805 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1806 q
->udma
= EZ(t
->udma
* 1000, UT
);
1809 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1810 struct ata_timing
*m
, unsigned int what
)
1812 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1813 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1814 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1815 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1816 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1817 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1818 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1819 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1822 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1824 const struct ata_timing
*t
;
1826 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1827 if (t
->mode
== 0xFF)
1832 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1833 struct ata_timing
*t
, int T
, int UT
)
1835 const struct ata_timing
*s
;
1836 struct ata_timing p
;
1842 if (!(s
= ata_timing_find_mode(speed
)))
1845 memcpy(t
, s
, sizeof(*s
));
1848 * If the drive is an EIDE drive, it can tell us it needs extended
1849 * PIO/MW_DMA cycle timing.
1852 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1853 memset(&p
, 0, sizeof(p
));
1854 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1855 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1856 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1857 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1858 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1860 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1864 * Convert the timing to bus clock counts.
1867 ata_timing_quantize(t
, t
, T
, UT
);
1870 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1871 * S.M.A.R.T * and some other commands. We have to ensure that the
1872 * DMA cycle timing is slower/equal than the fastest PIO timing.
1875 if (speed
> XFER_PIO_4
) {
1876 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1877 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1881 * Lengthen active & recovery time so that cycle time is correct.
1884 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1885 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1886 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1889 if (t
->active
+ t
->recover
< t
->cycle
) {
1890 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1891 t
->recover
= t
->cycle
- t
->active
;
1898 * ata_down_xfermask_limit - adjust dev xfer masks downward
1899 * @ap: Port associated with device @dev
1900 * @dev: Device to adjust xfer masks
1901 * @force_pio0: Force PIO0
1903 * Adjust xfer masks of @dev downward. Note that this function
1904 * does not apply the change. Invoking ata_set_mode() afterwards
1905 * will apply the limit.
1908 * Inherited from caller.
1911 * 0 on success, negative errno on failure
1913 static int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
1916 unsigned long xfer_mask
;
1919 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1924 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1925 if (xfer_mask
& ATA_MASK_UDMA
)
1926 xfer_mask
&= ~ATA_MASK_MWDMA
;
1928 highbit
= fls(xfer_mask
) - 1;
1929 xfer_mask
&= ~(1 << highbit
);
1931 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1935 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1938 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1939 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1947 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1949 unsigned int err_mask
;
1952 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1953 dev
->flags
|= ATA_DFLAG_PIO
;
1955 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1958 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1963 rc
= ata_dev_revalidate(ap
, dev
, 0);
1967 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1968 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1970 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1972 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1977 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1978 * @ap: port on which timings will be programmed
1979 * @r_failed_dev: out paramter for failed device
1981 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1982 * ata_set_mode() fails, pointer to the failing device is
1983 * returned in @r_failed_dev.
1986 * PCI/etc. bus probe sem.
1989 * 0 on success, negative errno otherwise
1991 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1993 struct ata_device
*dev
;
1994 int i
, rc
= 0, used_dma
= 0, found
= 0;
1996 /* step 1: calculate xfer_mask */
1997 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1998 unsigned int pio_mask
, dma_mask
;
2000 dev
= &ap
->device
[i
];
2002 if (!ata_dev_enabled(dev
))
2005 ata_dev_xfermask(ap
, dev
);
2007 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2008 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2009 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2010 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2019 /* step 2: always set host PIO timings */
2020 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2021 dev
= &ap
->device
[i
];
2022 if (!ata_dev_enabled(dev
))
2025 if (!dev
->pio_mode
) {
2026 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2027 ap
->id
, dev
->devno
);
2032 dev
->xfer_mode
= dev
->pio_mode
;
2033 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2034 if (ap
->ops
->set_piomode
)
2035 ap
->ops
->set_piomode(ap
, dev
);
2038 /* step 3: set host DMA timings */
2039 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2040 dev
= &ap
->device
[i
];
2042 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2045 dev
->xfer_mode
= dev
->dma_mode
;
2046 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2047 if (ap
->ops
->set_dmamode
)
2048 ap
->ops
->set_dmamode(ap
, dev
);
2051 /* step 4: update devices' xfer mode */
2052 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2053 dev
= &ap
->device
[i
];
2055 if (!ata_dev_enabled(dev
))
2058 rc
= ata_dev_set_mode(ap
, dev
);
2063 /* Record simplex status. If we selected DMA then the other
2064 * host channels are not permitted to do so.
2066 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2067 ap
->host_set
->simplex_claimed
= 1;
2069 /* step5: chip specific finalisation */
2070 if (ap
->ops
->post_set_mode
)
2071 ap
->ops
->post_set_mode(ap
);
2075 *r_failed_dev
= dev
;
2080 * ata_tf_to_host - issue ATA taskfile to host controller
2081 * @ap: port to which command is being issued
2082 * @tf: ATA taskfile register set
2084 * Issues ATA taskfile register set to ATA host controller,
2085 * with proper synchronization with interrupt handler and
2089 * spin_lock_irqsave(host_set lock)
2092 static inline void ata_tf_to_host(struct ata_port
*ap
,
2093 const struct ata_taskfile
*tf
)
2095 ap
->ops
->tf_load(ap
, tf
);
2096 ap
->ops
->exec_command(ap
, tf
);
2100 * ata_busy_sleep - sleep until BSY clears, or timeout
2101 * @ap: port containing status register to be polled
2102 * @tmout_pat: impatience timeout
2103 * @tmout: overall timeout
2105 * Sleep until ATA Status register bit BSY clears,
2106 * or a timeout occurs.
2111 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2112 unsigned long tmout_pat
, unsigned long tmout
)
2114 unsigned long timer_start
, timeout
;
2117 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2118 timer_start
= jiffies
;
2119 timeout
= timer_start
+ tmout_pat
;
2120 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2122 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2125 if (status
& ATA_BUSY
)
2126 printk(KERN_WARNING
"ata%u is slow to respond, "
2127 "please be patient\n", ap
->id
);
2129 timeout
= timer_start
+ tmout
;
2130 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2132 status
= ata_chk_status(ap
);
2135 if (status
& ATA_BUSY
) {
2136 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2137 ap
->id
, tmout
/ HZ
);
2144 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2146 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2147 unsigned int dev0
= devmask
& (1 << 0);
2148 unsigned int dev1
= devmask
& (1 << 1);
2149 unsigned long timeout
;
2151 /* if device 0 was found in ata_devchk, wait for its
2155 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2157 /* if device 1 was found in ata_devchk, wait for
2158 * register access, then wait for BSY to clear
2160 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2164 ap
->ops
->dev_select(ap
, 1);
2165 if (ap
->flags
& ATA_FLAG_MMIO
) {
2166 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2167 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2169 nsect
= inb(ioaddr
->nsect_addr
);
2170 lbal
= inb(ioaddr
->lbal_addr
);
2172 if ((nsect
== 1) && (lbal
== 1))
2174 if (time_after(jiffies
, timeout
)) {
2178 msleep(50); /* give drive a breather */
2181 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2183 /* is all this really necessary? */
2184 ap
->ops
->dev_select(ap
, 0);
2186 ap
->ops
->dev_select(ap
, 1);
2188 ap
->ops
->dev_select(ap
, 0);
2191 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2192 unsigned int devmask
)
2194 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2196 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2198 /* software reset. causes dev0 to be selected */
2199 if (ap
->flags
& ATA_FLAG_MMIO
) {
2200 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2201 udelay(20); /* FIXME: flush */
2202 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2203 udelay(20); /* FIXME: flush */
2204 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2206 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2208 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2210 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2213 /* spec mandates ">= 2ms" before checking status.
2214 * We wait 150ms, because that was the magic delay used for
2215 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2216 * between when the ATA command register is written, and then
2217 * status is checked. Because waiting for "a while" before
2218 * checking status is fine, post SRST, we perform this magic
2219 * delay here as well.
2221 * Old drivers/ide uses the 2mS rule and then waits for ready
2225 /* Before we perform post reset processing we want to see if
2226 * the bus shows 0xFF because the odd clown forgets the D7
2227 * pulldown resistor.
2229 if (ata_check_status(ap
) == 0xFF)
2230 return AC_ERR_OTHER
;
2232 ata_bus_post_reset(ap
, devmask
);
2238 * ata_bus_reset - reset host port and associated ATA channel
2239 * @ap: port to reset
2241 * This is typically the first time we actually start issuing
2242 * commands to the ATA channel. We wait for BSY to clear, then
2243 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2244 * result. Determine what devices, if any, are on the channel
2245 * by looking at the device 0/1 error register. Look at the signature
2246 * stored in each device's taskfile registers, to determine if
2247 * the device is ATA or ATAPI.
2250 * PCI/etc. bus probe sem.
2251 * Obtains host_set lock.
2254 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2257 void ata_bus_reset(struct ata_port
*ap
)
2259 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2260 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2262 unsigned int dev0
, dev1
= 0, devmask
= 0;
2264 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2266 /* determine if device 0/1 are present */
2267 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2270 dev0
= ata_devchk(ap
, 0);
2272 dev1
= ata_devchk(ap
, 1);
2276 devmask
|= (1 << 0);
2278 devmask
|= (1 << 1);
2280 /* select device 0 again */
2281 ap
->ops
->dev_select(ap
, 0);
2283 /* issue bus reset */
2284 if (ap
->flags
& ATA_FLAG_SRST
)
2285 if (ata_bus_softreset(ap
, devmask
))
2289 * determine by signature whether we have ATA or ATAPI devices
2291 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2292 if ((slave_possible
) && (err
!= 0x81))
2293 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2295 /* re-enable interrupts */
2296 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2299 /* is double-select really necessary? */
2300 if (ap
->device
[1].class != ATA_DEV_NONE
)
2301 ap
->ops
->dev_select(ap
, 1);
2302 if (ap
->device
[0].class != ATA_DEV_NONE
)
2303 ap
->ops
->dev_select(ap
, 0);
2305 /* if no devices were detected, disable this port */
2306 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2307 (ap
->device
[1].class == ATA_DEV_NONE
))
2310 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2311 /* set up device control for ATA_FLAG_SATA_RESET */
2312 if (ap
->flags
& ATA_FLAG_MMIO
)
2313 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2315 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2322 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2323 ap
->ops
->port_disable(ap
);
2328 static int sata_phy_resume(struct ata_port
*ap
)
2330 unsigned long timeout
= jiffies
+ (HZ
* 5);
2331 u32 scontrol
, sstatus
;
2333 scontrol
= scr_read(ap
, SCR_CONTROL
);
2334 scontrol
= (scontrol
& 0x0f0) | 0x300;
2335 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2337 /* Wait for phy to become ready, if necessary. */
2340 sstatus
= scr_read(ap
, SCR_STATUS
);
2341 if ((sstatus
& 0xf) != 1)
2343 } while (time_before(jiffies
, timeout
));
2349 * ata_std_probeinit - initialize probing
2350 * @ap: port to be probed
2352 * @ap is about to be probed. Initialize it. This function is
2353 * to be used as standard callback for ata_drive_probe_reset().
2355 * NOTE!!! Do not use this function as probeinit if a low level
2356 * driver implements only hardreset. Just pass NULL as probeinit
2357 * in that case. Using this function is probably okay but doing
2358 * so makes reset sequence different from the original
2359 * ->phy_reset implementation and Jeff nervous. :-P
2361 void ata_std_probeinit(struct ata_port
*ap
)
2363 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2366 sata_phy_resume(ap
);
2368 spd
= (scr_read(ap
, SCR_CONTROL
) & 0xf0) >> 4;
2370 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2372 if (sata_dev_present(ap
))
2373 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2378 * ata_std_softreset - reset host port via ATA SRST
2379 * @ap: port to reset
2380 * @verbose: fail verbosely
2381 * @classes: resulting classes of attached devices
2383 * Reset host port using ATA SRST. This function is to be used
2384 * as standard callback for ata_drive_*_reset() functions.
2387 * Kernel thread context (may sleep)
2390 * 0 on success, -errno otherwise.
2392 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2394 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2395 unsigned int devmask
= 0, err_mask
;
2400 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2401 classes
[0] = ATA_DEV_NONE
;
2405 /* determine if device 0/1 are present */
2406 if (ata_devchk(ap
, 0))
2407 devmask
|= (1 << 0);
2408 if (slave_possible
&& ata_devchk(ap
, 1))
2409 devmask
|= (1 << 1);
2411 /* select device 0 again */
2412 ap
->ops
->dev_select(ap
, 0);
2414 /* issue bus reset */
2415 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2416 err_mask
= ata_bus_softreset(ap
, devmask
);
2419 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2422 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2427 /* determine by signature whether we have ATA or ATAPI devices */
2428 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2429 if (slave_possible
&& err
!= 0x81)
2430 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2433 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2438 * sata_std_hardreset - reset host port via SATA phy reset
2439 * @ap: port to reset
2440 * @verbose: fail verbosely
2441 * @class: resulting class of attached device
2443 * SATA phy-reset host port using DET bits of SControl register.
2444 * This function is to be used as standard callback for
2445 * ata_drive_*_reset().
2448 * Kernel thread context (may sleep)
2451 * 0 on success, -errno otherwise.
2453 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2459 if (ata_set_sata_spd_needed(ap
)) {
2460 /* SATA spec says nothing about how to reconfigure
2461 * spd. To be on the safe side, turn off phy during
2462 * reconfiguration. This works for at least ICH7 AHCI
2465 scontrol
= scr_read(ap
, SCR_CONTROL
);
2466 scontrol
= (scontrol
& 0x0f0) | 0x302;
2467 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2469 ata_set_sata_spd(ap
);
2472 /* issue phy wake/reset */
2473 scontrol
= scr_read(ap
, SCR_CONTROL
);
2474 scontrol
= (scontrol
& 0x0f0) | 0x301;
2475 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2477 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2478 * 10.4.2 says at least 1 ms.
2482 /* bring phy back */
2483 sata_phy_resume(ap
);
2485 /* TODO: phy layer with polling, timeouts, etc. */
2486 if (!sata_dev_present(ap
)) {
2487 *class = ATA_DEV_NONE
;
2488 DPRINTK("EXIT, link offline\n");
2492 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2494 printk(KERN_ERR
"ata%u: COMRESET failed "
2495 "(device not ready)\n", ap
->id
);
2497 DPRINTK("EXIT, device not ready\n");
2501 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2503 *class = ata_dev_try_classify(ap
, 0, NULL
);
2505 DPRINTK("EXIT, class=%u\n", *class);
2510 * ata_std_postreset - standard postreset callback
2511 * @ap: the target ata_port
2512 * @classes: classes of attached devices
2514 * This function is invoked after a successful reset. Note that
2515 * the device might have been reset more than once using
2516 * different reset methods before postreset is invoked.
2518 * This function is to be used as standard callback for
2519 * ata_drive_*_reset().
2522 * Kernel thread context (may sleep)
2524 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2528 /* set cable type if it isn't already set */
2529 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2530 ap
->cbl
= ATA_CBL_SATA
;
2532 /* print link status */
2533 if (ap
->cbl
== ATA_CBL_SATA
)
2534 sata_print_link_status(ap
);
2536 /* re-enable interrupts */
2537 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2540 /* is double-select really necessary? */
2541 if (classes
[0] != ATA_DEV_NONE
)
2542 ap
->ops
->dev_select(ap
, 1);
2543 if (classes
[1] != ATA_DEV_NONE
)
2544 ap
->ops
->dev_select(ap
, 0);
2546 /* bail out if no device is present */
2547 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2548 DPRINTK("EXIT, no device\n");
2552 /* set up device control */
2553 if (ap
->ioaddr
.ctl_addr
) {
2554 if (ap
->flags
& ATA_FLAG_MMIO
)
2555 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2557 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2564 * ata_std_probe_reset - standard probe reset method
2565 * @ap: prot to perform probe-reset
2566 * @classes: resulting classes of attached devices
2568 * The stock off-the-shelf ->probe_reset method.
2571 * Kernel thread context (may sleep)
2574 * 0 on success, -errno otherwise.
2576 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2578 ata_reset_fn_t hardreset
;
2581 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2582 hardreset
= sata_std_hardreset
;
2584 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2585 ata_std_softreset
, hardreset
,
2586 ata_std_postreset
, classes
);
2589 static int ata_do_reset(struct ata_port
*ap
,
2590 ata_reset_fn_t reset
, ata_postreset_fn_t postreset
,
2591 int verbose
, unsigned int *classes
)
2595 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2596 classes
[i
] = ATA_DEV_UNKNOWN
;
2598 rc
= reset(ap
, verbose
, classes
);
2602 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2603 * is complete and convert all ATA_DEV_UNKNOWN to
2606 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2607 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2610 if (i
< ATA_MAX_DEVICES
)
2611 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2612 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2613 classes
[i
] = ATA_DEV_NONE
;
2616 postreset(ap
, classes
);
2622 * ata_drive_probe_reset - Perform probe reset with given methods
2623 * @ap: port to reset
2624 * @probeinit: probeinit method (can be NULL)
2625 * @softreset: softreset method (can be NULL)
2626 * @hardreset: hardreset method (can be NULL)
2627 * @postreset: postreset method (can be NULL)
2628 * @classes: resulting classes of attached devices
2630 * Reset the specified port and classify attached devices using
2631 * given methods. This function prefers softreset but tries all
2632 * possible reset sequences to reset and classify devices. This
2633 * function is intended to be used for constructing ->probe_reset
2634 * callback by low level drivers.
2636 * Reset methods should follow the following rules.
2638 * - Return 0 on sucess, -errno on failure.
2639 * - If classification is supported, fill classes[] with
2640 * recognized class codes.
2641 * - If classification is not supported, leave classes[] alone.
2642 * - If verbose is non-zero, print error message on failure;
2643 * otherwise, shut up.
2646 * Kernel thread context (may sleep)
2649 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2650 * if classification fails, and any error code from reset
2653 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2654 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2655 ata_postreset_fn_t postreset
, unsigned int *classes
)
2662 if (softreset
&& !ata_set_sata_spd_needed(ap
)) {
2663 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2664 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2666 printk(KERN_INFO
"ata%u: softreset failed, will try "
2667 "hardreset in 5 secs\n", ap
->id
);
2675 rc
= ata_do_reset(ap
, hardreset
, postreset
, 0, classes
);
2677 if (classes
[0] != ATA_DEV_UNKNOWN
)
2682 if (ata_down_sata_spd_limit(ap
))
2685 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2686 "in 5 secs\n", ap
->id
);
2691 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2692 "classification, will retry softreset in 5 secs\n",
2696 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2700 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2706 * ata_dev_same_device - Determine whether new ID matches configured device
2707 * @ap: port on which the device to compare against resides
2708 * @dev: device to compare against
2709 * @new_class: class of the new device
2710 * @new_id: IDENTIFY page of the new device
2712 * Compare @new_class and @new_id against @dev and determine
2713 * whether @dev is the device indicated by @new_class and
2720 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2722 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2723 unsigned int new_class
, const u16
*new_id
)
2725 const u16
*old_id
= dev
->id
;
2726 unsigned char model
[2][41], serial
[2][21];
2729 if (dev
->class != new_class
) {
2731 "ata%u: dev %u class mismatch %d != %d\n",
2732 ap
->id
, dev
->devno
, dev
->class, new_class
);
2736 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2737 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2738 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2739 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2740 new_n_sectors
= ata_id_n_sectors(new_id
);
2742 if (strcmp(model
[0], model
[1])) {
2744 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2745 ap
->id
, dev
->devno
, model
[0], model
[1]);
2749 if (strcmp(serial
[0], serial
[1])) {
2751 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2752 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2756 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2758 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2759 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2760 (unsigned long long)new_n_sectors
);
2768 * ata_dev_revalidate - Revalidate ATA device
2769 * @ap: port on which the device to revalidate resides
2770 * @dev: device to revalidate
2771 * @post_reset: is this revalidation after reset?
2773 * Re-read IDENTIFY page and make sure @dev is still attached to
2777 * Kernel thread context (may sleep)
2780 * 0 on success, negative errno otherwise
2782 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2785 unsigned int class = dev
->class;
2789 if (!ata_dev_enabled(dev
)) {
2794 /* allocate & read ID data */
2795 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2799 /* is the device still there? */
2800 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2808 /* configure device according to the new ID */
2809 rc
= ata_dev_configure(ap
, dev
, 0);
2814 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2815 ap
->id
, dev
->devno
, rc
);
2820 static const char * const ata_dma_blacklist
[] = {
2821 "WDC AC11000H", NULL
,
2822 "WDC AC22100H", NULL
,
2823 "WDC AC32500H", NULL
,
2824 "WDC AC33100H", NULL
,
2825 "WDC AC31600H", NULL
,
2826 "WDC AC32100H", "24.09P07",
2827 "WDC AC23200L", "21.10N21",
2828 "Compaq CRD-8241B", NULL
,
2833 "SanDisk SDP3B", NULL
,
2834 "SanDisk SDP3B-64", NULL
,
2835 "SANYO CD-ROM CRD", NULL
,
2836 "HITACHI CDR-8", NULL
,
2837 "HITACHI CDR-8335", NULL
,
2838 "HITACHI CDR-8435", NULL
,
2839 "Toshiba CD-ROM XM-6202B", NULL
,
2840 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2842 "E-IDE CD-ROM CR-840", NULL
,
2843 "CD-ROM Drive/F5A", NULL
,
2844 "WPI CDD-820", NULL
,
2845 "SAMSUNG CD-ROM SC-148C", NULL
,
2846 "SAMSUNG CD-ROM SC", NULL
,
2847 "SanDisk SDP3B-64", NULL
,
2848 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2849 "_NEC DV5800A", NULL
,
2850 "SAMSUNG CD-ROM SN-124", "N001"
2853 static int ata_strim(char *s
, size_t len
)
2855 len
= strnlen(s
, len
);
2857 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2858 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2865 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2867 unsigned char model_num
[40];
2868 unsigned char model_rev
[16];
2869 unsigned int nlen
, rlen
;
2872 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2874 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2876 nlen
= ata_strim(model_num
, sizeof(model_num
));
2877 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2879 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2880 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2881 if (ata_dma_blacklist
[i
+1] == NULL
)
2883 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2891 * ata_dev_xfermask - Compute supported xfermask of the given device
2892 * @ap: Port on which the device to compute xfermask for resides
2893 * @dev: Device to compute xfermask for
2895 * Compute supported xfermask of @dev and store it in
2896 * dev->*_mask. This function is responsible for applying all
2897 * known limits including host controller limits, device
2900 * FIXME: The current implementation limits all transfer modes to
2901 * the fastest of the lowested device on the port. This is not
2902 * required on most controllers.
2907 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2909 struct ata_host_set
*hs
= ap
->host_set
;
2910 unsigned long xfer_mask
;
2913 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2914 ap
->mwdma_mask
, ap
->udma_mask
);
2916 /* Apply cable rule here. Don't apply it early because when
2917 * we handle hot plug the cable type can itself change.
2919 if (ap
->cbl
== ATA_CBL_PATA40
)
2920 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2922 /* FIXME: Use port-wide xfermask for now */
2923 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2924 struct ata_device
*d
= &ap
->device
[i
];
2926 if (ata_dev_absent(d
))
2929 if (ata_dev_disabled(d
)) {
2930 /* to avoid violating device selection timing */
2931 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2932 UINT_MAX
, UINT_MAX
);
2936 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2937 d
->mwdma_mask
, d
->udma_mask
);
2938 xfer_mask
&= ata_id_xfermask(d
->id
);
2939 if (ata_dma_blacklisted(d
))
2940 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2943 if (ata_dma_blacklisted(dev
))
2944 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2945 "disabling DMA\n", ap
->id
, dev
->devno
);
2947 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2948 if (hs
->simplex_claimed
)
2949 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2952 if (ap
->ops
->mode_filter
)
2953 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2955 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2956 &dev
->mwdma_mask
, &dev
->udma_mask
);
2960 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2961 * @ap: Port associated with device @dev
2962 * @dev: Device to which command will be sent
2964 * Issue SET FEATURES - XFER MODE command to device @dev
2968 * PCI/etc. bus probe sem.
2971 * 0 on success, AC_ERR_* mask otherwise.
2974 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2975 struct ata_device
*dev
)
2977 struct ata_taskfile tf
;
2978 unsigned int err_mask
;
2980 /* set up set-features taskfile */
2981 DPRINTK("set features - xfer mode\n");
2983 ata_tf_init(ap
, &tf
, dev
->devno
);
2984 tf
.command
= ATA_CMD_SET_FEATURES
;
2985 tf
.feature
= SETFEATURES_XFER
;
2986 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2987 tf
.protocol
= ATA_PROT_NODATA
;
2988 tf
.nsect
= dev
->xfer_mode
;
2990 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2992 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2997 * ata_dev_init_params - Issue INIT DEV PARAMS command
2998 * @ap: Port associated with device @dev
2999 * @dev: Device to which command will be sent
3002 * Kernel thread context (may sleep)
3005 * 0 on success, AC_ERR_* mask otherwise.
3008 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
3009 struct ata_device
*dev
,
3013 struct ata_taskfile tf
;
3014 unsigned int err_mask
;
3016 /* Number of sectors per track 1-255. Number of heads 1-16 */
3017 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3018 return AC_ERR_INVALID
;
3020 /* set up init dev params taskfile */
3021 DPRINTK("init dev params \n");
3023 ata_tf_init(ap
, &tf
, dev
->devno
);
3024 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3025 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3026 tf
.protocol
= ATA_PROT_NODATA
;
3028 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3030 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
3032 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3037 * ata_sg_clean - Unmap DMA memory associated with command
3038 * @qc: Command containing DMA memory to be released
3040 * Unmap all mapped DMA memory associated with this command.
3043 * spin_lock_irqsave(host_set lock)
3046 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3048 struct ata_port
*ap
= qc
->ap
;
3049 struct scatterlist
*sg
= qc
->__sg
;
3050 int dir
= qc
->dma_dir
;
3051 void *pad_buf
= NULL
;
3053 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3054 WARN_ON(sg
== NULL
);
3056 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3057 WARN_ON(qc
->n_elem
> 1);
3059 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3061 /* if we padded the buffer out to 32-bit bound, and data
3062 * xfer direction is from-device, we must copy from the
3063 * pad buffer back into the supplied buffer
3065 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3066 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3068 if (qc
->flags
& ATA_QCFLAG_SG
) {
3070 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3071 /* restore last sg */
3072 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3074 struct scatterlist
*psg
= &qc
->pad_sgent
;
3075 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3076 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3077 kunmap_atomic(addr
, KM_IRQ0
);
3081 dma_unmap_single(ap
->dev
,
3082 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3085 sg
->length
+= qc
->pad_len
;
3087 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3088 pad_buf
, qc
->pad_len
);
3091 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3096 * ata_fill_sg - Fill PCI IDE PRD table
3097 * @qc: Metadata associated with taskfile to be transferred
3099 * Fill PCI IDE PRD (scatter-gather) table with segments
3100 * associated with the current disk command.
3103 * spin_lock_irqsave(host_set lock)
3106 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3108 struct ata_port
*ap
= qc
->ap
;
3109 struct scatterlist
*sg
;
3112 WARN_ON(qc
->__sg
== NULL
);
3113 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3116 ata_for_each_sg(sg
, qc
) {
3120 /* determine if physical DMA addr spans 64K boundary.
3121 * Note h/w doesn't support 64-bit, so we unconditionally
3122 * truncate dma_addr_t to u32.
3124 addr
= (u32
) sg_dma_address(sg
);
3125 sg_len
= sg_dma_len(sg
);
3128 offset
= addr
& 0xffff;
3130 if ((offset
+ sg_len
) > 0x10000)
3131 len
= 0x10000 - offset
;
3133 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3134 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3135 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3144 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3147 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3148 * @qc: Metadata associated with taskfile to check
3150 * Allow low-level driver to filter ATA PACKET commands, returning
3151 * a status indicating whether or not it is OK to use DMA for the
3152 * supplied PACKET command.
3155 * spin_lock_irqsave(host_set lock)
3157 * RETURNS: 0 when ATAPI DMA can be used
3160 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3162 struct ata_port
*ap
= qc
->ap
;
3163 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3165 if (ap
->ops
->check_atapi_dma
)
3166 rc
= ap
->ops
->check_atapi_dma(qc
);
3171 * ata_qc_prep - Prepare taskfile for submission
3172 * @qc: Metadata associated with taskfile to be prepared
3174 * Prepare ATA taskfile for submission.
3177 * spin_lock_irqsave(host_set lock)
3179 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3181 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3187 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3190 * ata_sg_init_one - Associate command with memory buffer
3191 * @qc: Command to be associated
3192 * @buf: Memory buffer
3193 * @buflen: Length of memory buffer, in bytes.
3195 * Initialize the data-related elements of queued_cmd @qc
3196 * to point to a single memory buffer, @buf of byte length @buflen.
3199 * spin_lock_irqsave(host_set lock)
3202 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3204 struct scatterlist
*sg
;
3206 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3208 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3209 qc
->__sg
= &qc
->sgent
;
3211 qc
->orig_n_elem
= 1;
3215 sg_init_one(sg
, buf
, buflen
);
3219 * ata_sg_init - Associate command with scatter-gather table.
3220 * @qc: Command to be associated
3221 * @sg: Scatter-gather table.
3222 * @n_elem: Number of elements in s/g table.
3224 * Initialize the data-related elements of queued_cmd @qc
3225 * to point to a scatter-gather table @sg, containing @n_elem
3229 * spin_lock_irqsave(host_set lock)
3232 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3233 unsigned int n_elem
)
3235 qc
->flags
|= ATA_QCFLAG_SG
;
3237 qc
->n_elem
= n_elem
;
3238 qc
->orig_n_elem
= n_elem
;
3242 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3243 * @qc: Command with memory buffer to be mapped.
3245 * DMA-map the memory buffer associated with queued_cmd @qc.
3248 * spin_lock_irqsave(host_set lock)
3251 * Zero on success, negative on error.
3254 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3256 struct ata_port
*ap
= qc
->ap
;
3257 int dir
= qc
->dma_dir
;
3258 struct scatterlist
*sg
= qc
->__sg
;
3259 dma_addr_t dma_address
;
3262 /* we must lengthen transfers to end on a 32-bit boundary */
3263 qc
->pad_len
= sg
->length
& 3;
3265 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3266 struct scatterlist
*psg
= &qc
->pad_sgent
;
3268 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3270 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3272 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3273 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3276 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3277 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3279 sg
->length
-= qc
->pad_len
;
3280 if (sg
->length
== 0)
3283 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3284 sg
->length
, qc
->pad_len
);
3292 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3294 if (dma_mapping_error(dma_address
)) {
3296 sg
->length
+= qc
->pad_len
;
3300 sg_dma_address(sg
) = dma_address
;
3301 sg_dma_len(sg
) = sg
->length
;
3304 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3305 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3311 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3312 * @qc: Command with scatter-gather table to be mapped.
3314 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3317 * spin_lock_irqsave(host_set lock)
3320 * Zero on success, negative on error.
3324 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3326 struct ata_port
*ap
= qc
->ap
;
3327 struct scatterlist
*sg
= qc
->__sg
;
3328 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3329 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3331 VPRINTK("ENTER, ata%u\n", ap
->id
);
3332 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3334 /* we must lengthen transfers to end on a 32-bit boundary */
3335 qc
->pad_len
= lsg
->length
& 3;
3337 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3338 struct scatterlist
*psg
= &qc
->pad_sgent
;
3339 unsigned int offset
;
3341 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3343 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3346 * psg->page/offset are used to copy to-be-written
3347 * data in this function or read data in ata_sg_clean.
3349 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3350 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3351 psg
->offset
= offset_in_page(offset
);
3353 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3354 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3355 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3356 kunmap_atomic(addr
, KM_IRQ0
);
3359 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3360 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3362 lsg
->length
-= qc
->pad_len
;
3363 if (lsg
->length
== 0)
3366 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3367 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3370 pre_n_elem
= qc
->n_elem
;
3371 if (trim_sg
&& pre_n_elem
)
3380 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3382 /* restore last sg */
3383 lsg
->length
+= qc
->pad_len
;
3387 DPRINTK("%d sg elements mapped\n", n_elem
);
3390 qc
->n_elem
= n_elem
;
3396 * ata_poll_qc_complete - turn irq back on and finish qc
3397 * @qc: Command to complete
3398 * @err_mask: ATA status register content
3401 * None. (grabs host lock)
3404 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3406 struct ata_port
*ap
= qc
->ap
;
3407 unsigned long flags
;
3409 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3410 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3412 ata_qc_complete(qc
);
3413 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3417 * ata_pio_poll - poll using PIO, depending on current state
3418 * @ap: the target ata_port
3421 * None. (executing in kernel thread context)
3424 * timeout value to use
3427 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3429 struct ata_queued_cmd
*qc
;
3431 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3432 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3434 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3435 WARN_ON(qc
== NULL
);
3437 switch (ap
->hsm_task_state
) {
3440 poll_state
= HSM_ST_POLL
;
3444 case HSM_ST_LAST_POLL
:
3445 poll_state
= HSM_ST_LAST_POLL
;
3446 reg_state
= HSM_ST_LAST
;
3453 status
= ata_chk_status(ap
);
3454 if (status
& ATA_BUSY
) {
3455 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3456 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3457 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3460 ap
->hsm_task_state
= poll_state
;
3461 return ATA_SHORT_PAUSE
;
3464 ap
->hsm_task_state
= reg_state
;
3469 * ata_pio_complete - check if drive is busy or idle
3470 * @ap: the target ata_port
3473 * None. (executing in kernel thread context)
3476 * Non-zero if qc completed, zero otherwise.
3479 static int ata_pio_complete (struct ata_port
*ap
)
3481 struct ata_queued_cmd
*qc
;
3485 * This is purely heuristic. This is a fast path. Sometimes when
3486 * we enter, BSY will be cleared in a chk-status or two. If not,
3487 * the drive is probably seeking or something. Snooze for a couple
3488 * msecs, then chk-status again. If still busy, fall back to
3489 * HSM_ST_POLL state.
3491 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3492 if (drv_stat
& ATA_BUSY
) {
3494 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3495 if (drv_stat
& ATA_BUSY
) {
3496 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3497 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3502 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3503 WARN_ON(qc
== NULL
);
3505 drv_stat
= ata_wait_idle(ap
);
3506 if (!ata_ok(drv_stat
)) {
3507 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3508 ap
->hsm_task_state
= HSM_ST_ERR
;
3512 ap
->hsm_task_state
= HSM_ST_IDLE
;
3514 WARN_ON(qc
->err_mask
);
3515 ata_poll_qc_complete(qc
);
3517 /* another command may start at this point */
3524 * swap_buf_le16 - swap halves of 16-bit words in place
3525 * @buf: Buffer to swap
3526 * @buf_words: Number of 16-bit words in buffer.
3528 * Swap halves of 16-bit words if needed to convert from
3529 * little-endian byte order to native cpu byte order, or
3533 * Inherited from caller.
3535 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3540 for (i
= 0; i
< buf_words
; i
++)
3541 buf
[i
] = le16_to_cpu(buf
[i
]);
3542 #endif /* __BIG_ENDIAN */
3546 * ata_mmio_data_xfer - Transfer data by MMIO
3547 * @ap: port to read/write
3549 * @buflen: buffer length
3550 * @write_data: read/write
3552 * Transfer data from/to the device data register by MMIO.
3555 * Inherited from caller.
3558 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3559 unsigned int buflen
, int write_data
)
3562 unsigned int words
= buflen
>> 1;
3563 u16
*buf16
= (u16
*) buf
;
3564 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3566 /* Transfer multiple of 2 bytes */
3568 for (i
= 0; i
< words
; i
++)
3569 writew(le16_to_cpu(buf16
[i
]), mmio
);
3571 for (i
= 0; i
< words
; i
++)
3572 buf16
[i
] = cpu_to_le16(readw(mmio
));
3575 /* Transfer trailing 1 byte, if any. */
3576 if (unlikely(buflen
& 0x01)) {
3577 u16 align_buf
[1] = { 0 };
3578 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3581 memcpy(align_buf
, trailing_buf
, 1);
3582 writew(le16_to_cpu(align_buf
[0]), mmio
);
3584 align_buf
[0] = cpu_to_le16(readw(mmio
));
3585 memcpy(trailing_buf
, align_buf
, 1);
3591 * ata_pio_data_xfer - Transfer data by PIO
3592 * @ap: port to read/write
3594 * @buflen: buffer length
3595 * @write_data: read/write
3597 * Transfer data from/to the device data register by PIO.
3600 * Inherited from caller.
3603 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3604 unsigned int buflen
, int write_data
)
3606 unsigned int words
= buflen
>> 1;
3608 /* Transfer multiple of 2 bytes */
3610 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3612 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3614 /* Transfer trailing 1 byte, if any. */
3615 if (unlikely(buflen
& 0x01)) {
3616 u16 align_buf
[1] = { 0 };
3617 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3620 memcpy(align_buf
, trailing_buf
, 1);
3621 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3623 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3624 memcpy(trailing_buf
, align_buf
, 1);
3630 * ata_data_xfer - Transfer data from/to the data register.
3631 * @ap: port to read/write
3633 * @buflen: buffer length
3634 * @do_write: read/write
3636 * Transfer data from/to the device data register.
3639 * Inherited from caller.
3642 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3643 unsigned int buflen
, int do_write
)
3645 /* Make the crap hardware pay the costs not the good stuff */
3646 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3647 unsigned long flags
;
3648 local_irq_save(flags
);
3649 if (ap
->flags
& ATA_FLAG_MMIO
)
3650 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3652 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3653 local_irq_restore(flags
);
3655 if (ap
->flags
& ATA_FLAG_MMIO
)
3656 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3658 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3663 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3664 * @qc: Command on going
3666 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3669 * Inherited from caller.
3672 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3674 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3675 struct scatterlist
*sg
= qc
->__sg
;
3676 struct ata_port
*ap
= qc
->ap
;
3678 unsigned int offset
;
3681 if (qc
->cursect
== (qc
->nsect
- 1))
3682 ap
->hsm_task_state
= HSM_ST_LAST
;
3684 page
= sg
[qc
->cursg
].page
;
3685 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3687 /* get the current page and offset */
3688 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3689 offset
%= PAGE_SIZE
;
3691 buf
= kmap(page
) + offset
;
3696 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3701 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3703 /* do the actual data transfer */
3704 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3705 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3711 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3712 * @qc: Command on going
3713 * @bytes: number of bytes
3715 * Transfer Transfer data from/to the ATAPI device.
3718 * Inherited from caller.
3722 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3724 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3725 struct scatterlist
*sg
= qc
->__sg
;
3726 struct ata_port
*ap
= qc
->ap
;
3729 unsigned int offset
, count
;
3731 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3732 ap
->hsm_task_state
= HSM_ST_LAST
;
3735 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3737 * The end of qc->sg is reached and the device expects
3738 * more data to transfer. In order not to overrun qc->sg
3739 * and fulfill length specified in the byte count register,
3740 * - for read case, discard trailing data from the device
3741 * - for write case, padding zero data to the device
3743 u16 pad_buf
[1] = { 0 };
3744 unsigned int words
= bytes
>> 1;
3747 if (words
) /* warning if bytes > 1 */
3748 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3751 for (i
= 0; i
< words
; i
++)
3752 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3754 ap
->hsm_task_state
= HSM_ST_LAST
;
3758 sg
= &qc
->__sg
[qc
->cursg
];
3761 offset
= sg
->offset
+ qc
->cursg_ofs
;
3763 /* get the current page and offset */
3764 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3765 offset
%= PAGE_SIZE
;
3767 /* don't overrun current sg */
3768 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3770 /* don't cross page boundaries */
3771 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3773 buf
= kmap(page
) + offset
;
3776 qc
->curbytes
+= count
;
3777 qc
->cursg_ofs
+= count
;
3779 if (qc
->cursg_ofs
== sg
->length
) {
3784 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3786 /* do the actual data transfer */
3787 ata_data_xfer(ap
, buf
, count
, do_write
);
3796 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3797 * @qc: Command on going
3799 * Transfer Transfer data from/to the ATAPI device.
3802 * Inherited from caller.
3805 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3807 struct ata_port
*ap
= qc
->ap
;
3808 struct ata_device
*dev
= qc
->dev
;
3809 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3810 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3812 ap
->ops
->tf_read(ap
, &qc
->tf
);
3813 ireason
= qc
->tf
.nsect
;
3814 bc_lo
= qc
->tf
.lbam
;
3815 bc_hi
= qc
->tf
.lbah
;
3816 bytes
= (bc_hi
<< 8) | bc_lo
;
3818 /* shall be cleared to zero, indicating xfer of data */
3819 if (ireason
& (1 << 0))
3822 /* make sure transfer direction matches expected */
3823 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3824 if (do_write
!= i_write
)
3827 __atapi_pio_bytes(qc
, bytes
);
3832 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3833 ap
->id
, dev
->devno
);
3834 qc
->err_mask
|= AC_ERR_HSM
;
3835 ap
->hsm_task_state
= HSM_ST_ERR
;
3839 * ata_pio_block - start PIO on a block
3840 * @ap: the target ata_port
3843 * None. (executing in kernel thread context)
3846 static void ata_pio_block(struct ata_port
*ap
)
3848 struct ata_queued_cmd
*qc
;
3852 * This is purely heuristic. This is a fast path.
3853 * Sometimes when we enter, BSY will be cleared in
3854 * a chk-status or two. If not, the drive is probably seeking
3855 * or something. Snooze for a couple msecs, then
3856 * chk-status again. If still busy, fall back to
3857 * HSM_ST_POLL state.
3859 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3860 if (status
& ATA_BUSY
) {
3862 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3863 if (status
& ATA_BUSY
) {
3864 ap
->hsm_task_state
= HSM_ST_POLL
;
3865 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3870 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3871 WARN_ON(qc
== NULL
);
3874 if (status
& (ATA_ERR
| ATA_DF
)) {
3875 qc
->err_mask
|= AC_ERR_DEV
;
3876 ap
->hsm_task_state
= HSM_ST_ERR
;
3880 /* transfer data if any */
3881 if (is_atapi_taskfile(&qc
->tf
)) {
3882 /* DRQ=0 means no more data to transfer */
3883 if ((status
& ATA_DRQ
) == 0) {
3884 ap
->hsm_task_state
= HSM_ST_LAST
;
3888 atapi_pio_bytes(qc
);
3890 /* handle BSY=0, DRQ=0 as error */
3891 if ((status
& ATA_DRQ
) == 0) {
3892 qc
->err_mask
|= AC_ERR_HSM
;
3893 ap
->hsm_task_state
= HSM_ST_ERR
;
3901 static void ata_pio_error(struct ata_port
*ap
)
3903 struct ata_queued_cmd
*qc
;
3905 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3906 WARN_ON(qc
== NULL
);
3908 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3909 printk(KERN_WARNING
"ata%u: dev %u PIO error\n",
3910 ap
->id
, qc
->dev
->devno
);
3912 /* make sure qc->err_mask is available to
3913 * know what's wrong and recover
3915 WARN_ON(qc
->err_mask
== 0);
3917 ap
->hsm_task_state
= HSM_ST_IDLE
;
3919 ata_poll_qc_complete(qc
);
3922 static void ata_pio_task(void *_data
)
3924 struct ata_port
*ap
= _data
;
3925 unsigned long timeout
;
3932 switch (ap
->hsm_task_state
) {
3941 qc_completed
= ata_pio_complete(ap
);
3945 case HSM_ST_LAST_POLL
:
3946 timeout
= ata_pio_poll(ap
);
3956 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3957 else if (!qc_completed
)
3962 * atapi_packet_task - Write CDB bytes to hardware
3963 * @_data: Port to which ATAPI device is attached.
3965 * When device has indicated its readiness to accept
3966 * a CDB, this function is called. Send the CDB.
3967 * If DMA is to be performed, exit immediately.
3968 * Otherwise, we are in polling mode, so poll
3969 * status under operation succeeds or fails.
3972 * Kernel thread context (may sleep)
3975 static void atapi_packet_task(void *_data
)
3977 struct ata_port
*ap
= _data
;
3978 struct ata_queued_cmd
*qc
;
3981 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3982 WARN_ON(qc
== NULL
);
3983 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3985 /* sleep-wait for BSY to clear */
3986 DPRINTK("busy wait\n");
3987 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3988 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3992 /* make sure DRQ is set */
3993 status
= ata_chk_status(ap
);
3994 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3995 qc
->err_mask
|= AC_ERR_HSM
;
4000 DPRINTK("send cdb\n");
4001 WARN_ON(qc
->dev
->cdb_len
< 12);
4003 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4004 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4005 unsigned long flags
;
4007 /* Once we're done issuing command and kicking bmdma,
4008 * irq handler takes over. To not lose irq, we need
4009 * to clear NOINTR flag before sending cdb, but
4010 * interrupt handler shouldn't be invoked before we're
4011 * finished. Hence, the following locking.
4013 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4014 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4015 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4016 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4017 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4018 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4020 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4022 /* PIO commands are handled by polling */
4023 ap
->hsm_task_state
= HSM_ST
;
4024 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4030 ata_poll_qc_complete(qc
);
4034 * ata_qc_timeout - Handle timeout of queued command
4035 * @qc: Command that timed out
4037 * Some part of the kernel (currently, only the SCSI layer)
4038 * has noticed that the active command on port @ap has not
4039 * completed after a specified length of time. Handle this
4040 * condition by disabling DMA (if necessary) and completing
4041 * transactions, with error if necessary.
4043 * This also handles the case of the "lost interrupt", where
4044 * for some reason (possibly hardware bug, possibly driver bug)
4045 * an interrupt was not delivered to the driver, even though the
4046 * transaction completed successfully.
4049 * Inherited from SCSI layer (none, can sleep)
4052 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
4054 struct ata_port
*ap
= qc
->ap
;
4055 struct ata_host_set
*host_set
= ap
->host_set
;
4056 u8 host_stat
= 0, drv_stat
;
4057 unsigned long flags
;
4061 ap
->hsm_task_state
= HSM_ST_IDLE
;
4063 spin_lock_irqsave(&host_set
->lock
, flags
);
4065 switch (qc
->tf
.protocol
) {
4068 case ATA_PROT_ATAPI_DMA
:
4069 host_stat
= ap
->ops
->bmdma_status(ap
);
4071 /* before we do anything else, clear DMA-Start bit */
4072 ap
->ops
->bmdma_stop(qc
);
4078 drv_stat
= ata_chk_status(ap
);
4080 /* ack bmdma irq events */
4081 ap
->ops
->irq_clear(ap
);
4083 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
4084 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
4086 /* complete taskfile transaction */
4087 qc
->err_mask
|= ac_err_mask(drv_stat
);
4091 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4093 ata_eh_qc_complete(qc
);
4099 * ata_eng_timeout - Handle timeout of queued command
4100 * @ap: Port on which timed-out command is active
4102 * Some part of the kernel (currently, only the SCSI layer)
4103 * has noticed that the active command on port @ap has not
4104 * completed after a specified length of time. Handle this
4105 * condition by disabling DMA (if necessary) and completing
4106 * transactions, with error if necessary.
4108 * This also handles the case of the "lost interrupt", where
4109 * for some reason (possibly hardware bug, possibly driver bug)
4110 * an interrupt was not delivered to the driver, even though the
4111 * transaction completed successfully.
4114 * Inherited from SCSI layer (none, can sleep)
4117 void ata_eng_timeout(struct ata_port
*ap
)
4121 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
4127 * ata_qc_new - Request an available ATA command, for queueing
4128 * @ap: Port associated with device @dev
4129 * @dev: Device from whom we request an available command structure
4135 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4137 struct ata_queued_cmd
*qc
= NULL
;
4140 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4141 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4142 qc
= ata_qc_from_tag(ap
, i
);
4153 * ata_qc_new_init - Request an available ATA command, and initialize it
4154 * @ap: Port associated with device @dev
4155 * @dev: Device from whom we request an available command structure
4161 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4162 struct ata_device
*dev
)
4164 struct ata_queued_cmd
*qc
;
4166 qc
= ata_qc_new(ap
);
4179 * ata_qc_free - free unused ata_queued_cmd
4180 * @qc: Command to complete
4182 * Designed to free unused ata_queued_cmd object
4183 * in case something prevents using it.
4186 * spin_lock_irqsave(host_set lock)
4188 void ata_qc_free(struct ata_queued_cmd
*qc
)
4190 struct ata_port
*ap
= qc
->ap
;
4193 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4197 if (likely(ata_tag_valid(tag
))) {
4198 if (tag
== ap
->active_tag
)
4199 ap
->active_tag
= ATA_TAG_POISON
;
4200 qc
->tag
= ATA_TAG_POISON
;
4201 clear_bit(tag
, &ap
->qactive
);
4205 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4207 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4208 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4210 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4213 /* atapi: mark qc as inactive to prevent the interrupt handler
4214 * from completing the command twice later, before the error handler
4215 * is called. (when rc != 0 and atapi request sense is needed)
4217 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4219 /* call completion callback */
4220 qc
->complete_fn(qc
);
4223 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4225 struct ata_port
*ap
= qc
->ap
;
4227 switch (qc
->tf
.protocol
) {
4229 case ATA_PROT_ATAPI_DMA
:
4232 case ATA_PROT_ATAPI
:
4234 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4247 * ata_qc_issue - issue taskfile to device
4248 * @qc: command to issue to device
4250 * Prepare an ATA command to submission to device.
4251 * This includes mapping the data into a DMA-able
4252 * area, filling in the S/G table, and finally
4253 * writing the taskfile to hardware, starting the command.
4256 * spin_lock_irqsave(host_set lock)
4258 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4260 struct ata_port
*ap
= qc
->ap
;
4262 qc
->ap
->active_tag
= qc
->tag
;
4263 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4265 if (ata_should_dma_map(qc
)) {
4266 if (qc
->flags
& ATA_QCFLAG_SG
) {
4267 if (ata_sg_setup(qc
))
4269 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4270 if (ata_sg_setup_one(qc
))
4274 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4277 ap
->ops
->qc_prep(qc
);
4279 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4280 if (unlikely(qc
->err_mask
))
4285 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4286 qc
->err_mask
|= AC_ERR_SYSTEM
;
4288 ata_qc_complete(qc
);
4292 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4293 * @qc: command to issue to device
4295 * Using various libata functions and hooks, this function
4296 * starts an ATA command. ATA commands are grouped into
4297 * classes called "protocols", and issuing each type of protocol
4298 * is slightly different.
4300 * May be used as the qc_issue() entry in ata_port_operations.
4303 * spin_lock_irqsave(host_set lock)
4306 * Zero on success, AC_ERR_* mask on failure
4309 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4311 struct ata_port
*ap
= qc
->ap
;
4313 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4315 switch (qc
->tf
.protocol
) {
4316 case ATA_PROT_NODATA
:
4317 ata_tf_to_host(ap
, &qc
->tf
);
4321 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4322 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4323 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4326 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4327 ata_qc_set_polling(qc
);
4328 ata_tf_to_host(ap
, &qc
->tf
);
4329 ap
->hsm_task_state
= HSM_ST
;
4330 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4333 case ATA_PROT_ATAPI
:
4334 ata_qc_set_polling(qc
);
4335 ata_tf_to_host(ap
, &qc
->tf
);
4336 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4339 case ATA_PROT_ATAPI_NODATA
:
4340 ap
->flags
|= ATA_FLAG_NOINTR
;
4341 ata_tf_to_host(ap
, &qc
->tf
);
4342 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4345 case ATA_PROT_ATAPI_DMA
:
4346 ap
->flags
|= ATA_FLAG_NOINTR
;
4347 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4348 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4349 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4354 return AC_ERR_SYSTEM
;
4361 * ata_host_intr - Handle host interrupt for given (port, task)
4362 * @ap: Port on which interrupt arrived (possibly...)
4363 * @qc: Taskfile currently active in engine
4365 * Handle host interrupt for given queued command. Currently,
4366 * only DMA interrupts are handled. All other commands are
4367 * handled via polling with interrupts disabled (nIEN bit).
4370 * spin_lock_irqsave(host_set lock)
4373 * One if interrupt was handled, zero if not (shared irq).
4376 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4377 struct ata_queued_cmd
*qc
)
4379 u8 status
, host_stat
;
4381 switch (qc
->tf
.protocol
) {
4384 case ATA_PROT_ATAPI_DMA
:
4385 case ATA_PROT_ATAPI
:
4386 /* check status of DMA engine */
4387 host_stat
= ap
->ops
->bmdma_status(ap
);
4388 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4390 /* if it's not our irq... */
4391 if (!(host_stat
& ATA_DMA_INTR
))
4394 /* before we do anything else, clear DMA-Start bit */
4395 ap
->ops
->bmdma_stop(qc
);
4399 case ATA_PROT_ATAPI_NODATA
:
4400 case ATA_PROT_NODATA
:
4401 /* check altstatus */
4402 status
= ata_altstatus(ap
);
4403 if (status
& ATA_BUSY
)
4406 /* check main status, clearing INTRQ */
4407 status
= ata_chk_status(ap
);
4408 if (unlikely(status
& ATA_BUSY
))
4410 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4411 ap
->id
, qc
->tf
.protocol
, status
);
4413 /* ack bmdma irq events */
4414 ap
->ops
->irq_clear(ap
);
4416 /* complete taskfile transaction */
4417 qc
->err_mask
|= ac_err_mask(status
);
4418 ata_qc_complete(qc
);
4425 return 1; /* irq handled */
4428 ap
->stats
.idle_irq
++;
4431 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4432 ata_irq_ack(ap
, 0); /* debug trap */
4433 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4437 return 0; /* irq not handled */
4441 * ata_interrupt - Default ATA host interrupt handler
4442 * @irq: irq line (unused)
4443 * @dev_instance: pointer to our ata_host_set information structure
4446 * Default interrupt handler for PCI IDE devices. Calls
4447 * ata_host_intr() for each port that is not disabled.
4450 * Obtains host_set lock during operation.
4453 * IRQ_NONE or IRQ_HANDLED.
4456 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4458 struct ata_host_set
*host_set
= dev_instance
;
4460 unsigned int handled
= 0;
4461 unsigned long flags
;
4463 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4464 spin_lock_irqsave(&host_set
->lock
, flags
);
4466 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4467 struct ata_port
*ap
;
4469 ap
= host_set
->ports
[i
];
4471 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4472 struct ata_queued_cmd
*qc
;
4474 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4475 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4476 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4477 handled
|= ata_host_intr(ap
, qc
);
4481 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4483 return IRQ_RETVAL(handled
);
4488 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4489 * without filling any other registers
4491 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4494 struct ata_taskfile tf
;
4497 ata_tf_init(ap
, &tf
, dev
->devno
);
4500 tf
.flags
|= ATA_TFLAG_DEVICE
;
4501 tf
.protocol
= ATA_PROT_NODATA
;
4503 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4505 printk(KERN_ERR
"%s: ata command failed: %d\n",
4511 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4515 if (!ata_try_flush_cache(dev
))
4518 if (ata_id_has_flush_ext(dev
->id
))
4519 cmd
= ATA_CMD_FLUSH_EXT
;
4521 cmd
= ATA_CMD_FLUSH
;
4523 return ata_do_simple_cmd(ap
, dev
, cmd
);
4526 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4528 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4531 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4533 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4537 * ata_device_resume - wakeup a previously suspended devices
4538 * @ap: port the device is connected to
4539 * @dev: the device to resume
4541 * Kick the drive back into action, by sending it an idle immediate
4542 * command and making sure its transfer mode matches between drive
4546 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4548 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4549 struct ata_device
*failed_dev
;
4550 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4551 while (ata_set_mode(ap
, &failed_dev
))
4552 ata_dev_disable(ap
, failed_dev
);
4554 if (!ata_dev_enabled(dev
))
4556 if (dev
->class == ATA_DEV_ATA
)
4557 ata_start_drive(ap
, dev
);
4563 * ata_device_suspend - prepare a device for suspend
4564 * @ap: port the device is connected to
4565 * @dev: the device to suspend
4567 * Flush the cache on the drive, if appropriate, then issue a
4568 * standbynow command.
4570 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4572 if (!ata_dev_enabled(dev
))
4574 if (dev
->class == ATA_DEV_ATA
)
4575 ata_flush_cache(ap
, dev
);
4577 if (state
.event
!= PM_EVENT_FREEZE
)
4578 ata_standby_drive(ap
, dev
);
4579 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4584 * ata_port_start - Set port up for dma.
4585 * @ap: Port to initialize
4587 * Called just after data structures for each port are
4588 * initialized. Allocates space for PRD table.
4590 * May be used as the port_start() entry in ata_port_operations.
4593 * Inherited from caller.
4596 int ata_port_start (struct ata_port
*ap
)
4598 struct device
*dev
= ap
->dev
;
4601 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4605 rc
= ata_pad_alloc(ap
, dev
);
4607 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4611 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4618 * ata_port_stop - Undo ata_port_start()
4619 * @ap: Port to shut down
4621 * Frees the PRD table.
4623 * May be used as the port_stop() entry in ata_port_operations.
4626 * Inherited from caller.
4629 void ata_port_stop (struct ata_port
*ap
)
4631 struct device
*dev
= ap
->dev
;
4633 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4634 ata_pad_free(ap
, dev
);
4637 void ata_host_stop (struct ata_host_set
*host_set
)
4639 if (host_set
->mmio_base
)
4640 iounmap(host_set
->mmio_base
);
4645 * ata_host_remove - Unregister SCSI host structure with upper layers
4646 * @ap: Port to unregister
4647 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4650 * Inherited from caller.
4653 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4655 struct Scsi_Host
*sh
= ap
->host
;
4660 scsi_remove_host(sh
);
4662 ap
->ops
->port_stop(ap
);
4666 * ata_host_init - Initialize an ata_port structure
4667 * @ap: Structure to initialize
4668 * @host: associated SCSI mid-layer structure
4669 * @host_set: Collection of hosts to which @ap belongs
4670 * @ent: Probe information provided by low-level driver
4671 * @port_no: Port number associated with this ata_port
4673 * Initialize a new ata_port structure, and its associated
4677 * Inherited from caller.
4680 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4681 struct ata_host_set
*host_set
,
4682 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4688 host
->max_channel
= 1;
4689 host
->unique_id
= ata_unique_id
++;
4690 host
->max_cmd_len
= 12;
4692 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4693 ap
->id
= host
->unique_id
;
4695 ap
->ctl
= ATA_DEVCTL_OBS
;
4696 ap
->host_set
= host_set
;
4698 ap
->port_no
= port_no
;
4700 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4701 ap
->pio_mask
= ent
->pio_mask
;
4702 ap
->mwdma_mask
= ent
->mwdma_mask
;
4703 ap
->udma_mask
= ent
->udma_mask
;
4704 ap
->flags
|= ent
->host_flags
;
4705 ap
->ops
= ent
->port_ops
;
4706 ap
->cbl
= ATA_CBL_NONE
;
4707 ap
->sata_spd_limit
= UINT_MAX
;
4708 ap
->active_tag
= ATA_TAG_POISON
;
4709 ap
->last_ctl
= 0xFF;
4711 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4712 INIT_LIST_HEAD(&ap
->eh_done_q
);
4714 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4715 struct ata_device
*dev
= &ap
->device
[i
];
4717 dev
->pio_mask
= UINT_MAX
;
4718 dev
->mwdma_mask
= UINT_MAX
;
4719 dev
->udma_mask
= UINT_MAX
;
4723 ap
->stats
.unhandled_irq
= 1;
4724 ap
->stats
.idle_irq
= 1;
4727 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4731 * ata_host_add - Attach low-level ATA driver to system
4732 * @ent: Information provided by low-level driver
4733 * @host_set: Collections of ports to which we add
4734 * @port_no: Port number associated with this host
4736 * Attach low-level ATA driver to system.
4739 * PCI/etc. bus probe sem.
4742 * New ata_port on success, for NULL on error.
4745 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4746 struct ata_host_set
*host_set
,
4747 unsigned int port_no
)
4749 struct Scsi_Host
*host
;
4750 struct ata_port
*ap
;
4755 if (!ent
->port_ops
->probe_reset
&&
4756 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4757 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4762 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4766 host
->transportt
= &ata_scsi_transport_template
;
4768 ap
= (struct ata_port
*) &host
->hostdata
[0];
4770 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4772 rc
= ap
->ops
->port_start(ap
);
4779 scsi_host_put(host
);
4784 * ata_device_add - Register hardware device with ATA and SCSI layers
4785 * @ent: Probe information describing hardware device to be registered
4787 * This function processes the information provided in the probe
4788 * information struct @ent, allocates the necessary ATA and SCSI
4789 * host information structures, initializes them, and registers
4790 * everything with requisite kernel subsystems.
4792 * This function requests irqs, probes the ATA bus, and probes
4796 * PCI/etc. bus probe sem.
4799 * Number of ports registered. Zero on error (no ports registered).
4802 int ata_device_add(const struct ata_probe_ent
*ent
)
4804 unsigned int count
= 0, i
;
4805 struct device
*dev
= ent
->dev
;
4806 struct ata_host_set
*host_set
;
4809 /* alloc a container for our list of ATA ports (buses) */
4810 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4811 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4814 spin_lock_init(&host_set
->lock
);
4816 host_set
->dev
= dev
;
4817 host_set
->n_ports
= ent
->n_ports
;
4818 host_set
->irq
= ent
->irq
;
4819 host_set
->mmio_base
= ent
->mmio_base
;
4820 host_set
->private_data
= ent
->private_data
;
4821 host_set
->ops
= ent
->port_ops
;
4822 host_set
->flags
= ent
->host_set_flags
;
4824 /* register each port bound to this device */
4825 for (i
= 0; i
< ent
->n_ports
; i
++) {
4826 struct ata_port
*ap
;
4827 unsigned long xfer_mode_mask
;
4829 ap
= ata_host_add(ent
, host_set
, i
);
4833 host_set
->ports
[i
] = ap
;
4834 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4835 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4836 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4838 /* print per-port info to dmesg */
4839 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4840 "bmdma 0x%lX irq %lu\n",
4842 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4843 ata_mode_string(xfer_mode_mask
),
4844 ap
->ioaddr
.cmd_addr
,
4845 ap
->ioaddr
.ctl_addr
,
4846 ap
->ioaddr
.bmdma_addr
,
4850 host_set
->ops
->irq_clear(ap
);
4857 /* obtain irq, that is shared between channels */
4858 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4859 DRV_NAME
, host_set
))
4862 /* perform each probe synchronously */
4863 DPRINTK("probe begin\n");
4864 for (i
= 0; i
< count
; i
++) {
4865 struct ata_port
*ap
;
4868 ap
= host_set
->ports
[i
];
4870 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4871 rc
= ata_bus_probe(ap
);
4872 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4875 /* FIXME: do something useful here?
4876 * Current libata behavior will
4877 * tear down everything when
4878 * the module is removed
4879 * or the h/w is unplugged.
4883 rc
= scsi_add_host(ap
->host
, dev
);
4885 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4887 /* FIXME: do something useful here */
4888 /* FIXME: handle unconditional calls to
4889 * scsi_scan_host and ata_host_remove, below,
4895 /* probes are done, now scan each port's disk(s) */
4896 DPRINTK("host probe begin\n");
4897 for (i
= 0; i
< count
; i
++) {
4898 struct ata_port
*ap
= host_set
->ports
[i
];
4900 ata_scsi_scan_host(ap
);
4903 dev_set_drvdata(dev
, host_set
);
4905 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4906 return ent
->n_ports
; /* success */
4909 for (i
= 0; i
< count
; i
++) {
4910 ata_host_remove(host_set
->ports
[i
], 1);
4911 scsi_host_put(host_set
->ports
[i
]->host
);
4915 VPRINTK("EXIT, returning 0\n");
4920 * ata_host_set_remove - PCI layer callback for device removal
4921 * @host_set: ATA host set that was removed
4923 * Unregister all objects associated with this host set. Free those
4927 * Inherited from calling layer (may sleep).
4930 void ata_host_set_remove(struct ata_host_set
*host_set
)
4932 struct ata_port
*ap
;
4935 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4936 ap
= host_set
->ports
[i
];
4937 scsi_remove_host(ap
->host
);
4940 free_irq(host_set
->irq
, host_set
);
4942 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4943 ap
= host_set
->ports
[i
];
4945 ata_scsi_release(ap
->host
);
4947 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4948 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4950 if (ioaddr
->cmd_addr
== 0x1f0)
4951 release_region(0x1f0, 8);
4952 else if (ioaddr
->cmd_addr
== 0x170)
4953 release_region(0x170, 8);
4956 scsi_host_put(ap
->host
);
4959 if (host_set
->ops
->host_stop
)
4960 host_set
->ops
->host_stop(host_set
);
4966 * ata_scsi_release - SCSI layer callback hook for host unload
4967 * @host: libata host to be unloaded
4969 * Performs all duties necessary to shut down a libata port...
4970 * Kill port kthread, disable port, and release resources.
4973 * Inherited from SCSI layer.
4979 int ata_scsi_release(struct Scsi_Host
*host
)
4981 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4986 ap
->ops
->port_disable(ap
);
4987 ata_host_remove(ap
, 0);
4988 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4989 kfree(ap
->device
[i
].id
);
4996 * ata_std_ports - initialize ioaddr with standard port offsets.
4997 * @ioaddr: IO address structure to be initialized
4999 * Utility function which initializes data_addr, error_addr,
5000 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5001 * device_addr, status_addr, and command_addr to standard offsets
5002 * relative to cmd_addr.
5004 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5007 void ata_std_ports(struct ata_ioports
*ioaddr
)
5009 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5010 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5011 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5012 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5013 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5014 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5015 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5016 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5017 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5018 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5024 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5026 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5028 pci_iounmap(pdev
, host_set
->mmio_base
);
5032 * ata_pci_remove_one - PCI layer callback for device removal
5033 * @pdev: PCI device that was removed
5035 * PCI layer indicates to libata via this hook that
5036 * hot-unplug or module unload event has occurred.
5037 * Handle this by unregistering all objects associated
5038 * with this PCI device. Free those objects. Then finally
5039 * release PCI resources and disable device.
5042 * Inherited from PCI layer (may sleep).
5045 void ata_pci_remove_one (struct pci_dev
*pdev
)
5047 struct device
*dev
= pci_dev_to_dev(pdev
);
5048 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5050 ata_host_set_remove(host_set
);
5051 pci_release_regions(pdev
);
5052 pci_disable_device(pdev
);
5053 dev_set_drvdata(dev
, NULL
);
5056 /* move to PCI subsystem */
5057 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5059 unsigned long tmp
= 0;
5061 switch (bits
->width
) {
5064 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5070 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5076 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5087 return (tmp
== bits
->val
) ? 1 : 0;
5090 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5092 pci_save_state(pdev
);
5093 pci_disable_device(pdev
);
5094 pci_set_power_state(pdev
, PCI_D3hot
);
5098 int ata_pci_device_resume(struct pci_dev
*pdev
)
5100 pci_set_power_state(pdev
, PCI_D0
);
5101 pci_restore_state(pdev
);
5102 pci_enable_device(pdev
);
5103 pci_set_master(pdev
);
5106 #endif /* CONFIG_PCI */
5109 static int __init
ata_init(void)
5111 ata_wq
= create_workqueue("ata");
5115 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5119 static void __exit
ata_exit(void)
5121 destroy_workqueue(ata_wq
);
5124 module_init(ata_init
);
5125 module_exit(ata_exit
);
5127 static unsigned long ratelimit_time
;
5128 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5130 int ata_ratelimit(void)
5133 unsigned long flags
;
5135 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5137 if (time_after(jiffies
, ratelimit_time
)) {
5139 ratelimit_time
= jiffies
+ (HZ
/5);
5143 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5149 * libata is essentially a library of internal helper functions for
5150 * low-level ATA host controller drivers. As such, the API/ABI is
5151 * likely to change as new drivers are added and updated.
5152 * Do not depend on ABI/API stability.
5155 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5156 EXPORT_SYMBOL_GPL(ata_std_ports
);
5157 EXPORT_SYMBOL_GPL(ata_device_add
);
5158 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5159 EXPORT_SYMBOL_GPL(ata_sg_init
);
5160 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5161 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5162 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5163 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5164 EXPORT_SYMBOL_GPL(ata_tf_load
);
5165 EXPORT_SYMBOL_GPL(ata_tf_read
);
5166 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5167 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5168 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5169 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5170 EXPORT_SYMBOL_GPL(ata_check_status
);
5171 EXPORT_SYMBOL_GPL(ata_altstatus
);
5172 EXPORT_SYMBOL_GPL(ata_exec_command
);
5173 EXPORT_SYMBOL_GPL(ata_port_start
);
5174 EXPORT_SYMBOL_GPL(ata_port_stop
);
5175 EXPORT_SYMBOL_GPL(ata_host_stop
);
5176 EXPORT_SYMBOL_GPL(ata_interrupt
);
5177 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5178 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5179 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5180 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5181 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5182 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5183 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5184 EXPORT_SYMBOL_GPL(ata_port_probe
);
5185 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5186 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5187 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5188 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5189 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5190 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5191 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5192 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5193 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5194 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5195 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5196 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5197 EXPORT_SYMBOL_GPL(ata_port_disable
);
5198 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5199 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5200 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5201 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5202 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5203 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5204 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5205 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5206 EXPORT_SYMBOL_GPL(ata_host_intr
);
5207 EXPORT_SYMBOL_GPL(ata_id_string
);
5208 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5209 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5210 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5211 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5213 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5214 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5215 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5218 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5219 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5220 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5221 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5222 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5223 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5224 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5225 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5226 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5227 #endif /* CONFIG_PCI */
5229 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5230 EXPORT_SYMBOL_GPL(ata_device_resume
);
5231 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5232 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);