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_device
*dev
,
65 u16 heads
, u16 sectors
);
66 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
67 static void ata_dev_xfermask(struct ata_device
*dev
);
69 static unsigned int ata_unique_id
= 1;
70 static struct workqueue_struct
*ata_wq
;
72 int atapi_enabled
= 1;
73 module_param(atapi_enabled
, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir
, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua
, libata_fua
, int, 0444);
82 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
105 fis
[0] = 0x27; /* Register - Host to Device FIS */
106 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis
[2] = tf
->command
;
109 fis
[3] = tf
->feature
;
116 fis
[8] = tf
->hob_lbal
;
117 fis
[9] = tf
->hob_lbam
;
118 fis
[10] = tf
->hob_lbah
;
119 fis
[11] = tf
->hob_feature
;
122 fis
[13] = tf
->hob_nsect
;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
145 tf
->command
= fis
[2]; /* status */
146 tf
->feature
= fis
[3]; /* error */
153 tf
->hob_lbal
= fis
[8];
154 tf
->hob_lbam
= fis
[9];
155 tf
->hob_lbah
= fis
[10];
158 tf
->hob_nsect
= fis
[13];
161 static const u8 ata_rw_cmds
[] = {
165 ATA_CMD_READ_MULTI_EXT
,
166 ATA_CMD_WRITE_MULTI_EXT
,
170 ATA_CMD_WRITE_MULTI_FUA_EXT
,
174 ATA_CMD_PIO_READ_EXT
,
175 ATA_CMD_PIO_WRITE_EXT
,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
203 struct ata_taskfile
*tf
= &qc
->tf
;
204 struct ata_device
*dev
= qc
->dev
;
207 int index
, fua
, lba48
, write
;
209 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
210 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
211 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
213 if (dev
->flags
& ATA_DFLAG_PIO
) {
214 tf
->protocol
= ATA_PROT_PIO
;
215 index
= dev
->multi_count
? 0 : 8;
216 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
217 /* Unable to use DMA due to host limitation */
218 tf
->protocol
= ATA_PROT_PIO
;
219 index
= dev
->multi_count
? 0 : 8;
221 tf
->protocol
= ATA_PROT_DMA
;
225 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
249 unsigned int mwdma_mask
,
250 unsigned int udma_mask
)
252 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
253 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
254 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask
,
268 unsigned int *pio_mask
,
269 unsigned int *mwdma_mask
,
270 unsigned int *udma_mask
)
273 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
275 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
277 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
280 static const struct ata_xfer_ent
{
284 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
285 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
286 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
305 int highbit
= fls(xfer_mask
) - 1;
306 const struct ata_xfer_ent
*ent
;
308 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
309 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
310 return ent
->base
+ highbit
- ent
->shift
;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
328 const struct ata_xfer_ent
*ent
;
330 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
331 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
332 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
350 const struct ata_xfer_ent
*ent
;
352 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
353 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask
)
374 static const char * const xfer_mode_str
[] = {
394 highbit
= fls(xfer_mask
) - 1;
395 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
396 return xfer_mode_str
[highbit
];
400 static const char *sata_spd_string(unsigned int spd
)
402 static const char * const spd_str
[] = {
407 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
409 return spd_str
[spd
- 1];
412 void ata_dev_disable(struct ata_device
*dev
)
414 if (ata_dev_enabled(dev
)) {
415 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
441 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
444 ap
->ops
->dev_select(ap
, device
);
446 outb(0x55, ioaddr
->nsect_addr
);
447 outb(0xaa, ioaddr
->lbal_addr
);
449 outb(0xaa, ioaddr
->nsect_addr
);
450 outb(0x55, ioaddr
->lbal_addr
);
452 outb(0x55, ioaddr
->nsect_addr
);
453 outb(0xaa, ioaddr
->lbal_addr
);
455 nsect
= inb(ioaddr
->nsect_addr
);
456 lbal
= inb(ioaddr
->lbal_addr
);
458 if ((nsect
== 0x55) && (lbal
== 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
485 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
488 ap
->ops
->dev_select(ap
, device
);
490 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
491 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
493 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
494 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
496 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
499 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
500 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
502 if ((nsect
== 0x55) && (lbal
== 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port
*ap
,
524 if (ap
->flags
& ATA_FLAG_MMIO
)
525 return ata_mmio_devchk(ap
, device
);
526 return ata_pio_devchk(ap
, device
);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
553 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
559 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI
;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN
;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
593 struct ata_taskfile tf
;
597 ap
->ops
->dev_select(ap
, device
);
599 memset(&tf
, 0, sizeof(tf
));
601 ap
->ops
->tf_read(ap
, &tf
);
606 /* see if device passed diags */
609 else if ((device
== 0) && (err
== 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf
);
617 if (class == ATA_DEV_UNKNOWN
)
619 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16
*id
, unsigned char *s
,
640 unsigned int ofs
, unsigned int len
)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16
*id
, unsigned char *s
,
673 unsigned int ofs
, unsigned int len
)
679 ata_id_string(id
, s
, ofs
, len
- 1);
681 p
= s
+ strnlen(s
, len
- 1);
682 while (p
> s
&& p
[-1] == ' ')
687 static u64
ata_id_n_sectors(const u16
*id
)
689 if (ata_id_has_lba(id
)) {
690 if (ata_id_has_lba48(id
))
691 return ata_id_u64(id
, 100);
693 return ata_id_u32(id
, 60);
695 if (ata_id_current_chs_valid(id
))
696 return ata_id_u32(id
, 57);
698 return id
[1] * id
[3] * id
[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
739 tmp
= ATA_DEVICE_OBS
;
741 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
743 if (ap
->flags
& ATA_FLAG_MMIO
) {
744 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
746 outb(tmp
, ap
->ioaddr
.device_addr
);
748 ata_pause(ap
); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
771 unsigned int wait
, unsigned int can_sleep
)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap
->id
, device
, wait
);
779 ap
->ops
->dev_select(ap
, device
);
782 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16
*id
)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16
*id
)
844 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
848 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
869 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
870 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
872 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
896 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
899 PREPARE_WORK(&ap
->port_task
, fn
, data
);
902 rc
= queue_work(ata_wq
, &ap
->port_task
);
904 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port
*ap
)
926 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
927 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
928 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq
);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap
->port_task
)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq
);
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
944 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
945 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
950 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
952 struct completion
*waiting
= qc
->private_data
;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device
*dev
,
977 struct ata_taskfile
*tf
, const u8
*cdb
,
978 int dma_dir
, void *buf
, unsigned int buflen
)
980 struct ata_port
*ap
= dev
->ap
;
981 u8 command
= tf
->command
;
982 struct ata_queued_cmd
*qc
;
983 unsigned int tag
, preempted_tag
;
984 DECLARE_COMPLETION(wait
);
986 unsigned int err_mask
;
989 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
991 /* no internal command while frozen */
992 if (ap
->flags
& ATA_FLAG_FROZEN
) {
993 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
994 return AC_ERR_SYSTEM
;
997 /* initialize internal qc */
999 /* XXX: Tag 0 is used for drivers with legacy EH as some
1000 * drivers choke if any other tag is given. This breaks
1001 * ata_tag_internal() test for those drivers. Don't use new
1002 * EH stuff without converting to it.
1004 if (ap
->ops
->error_handler
)
1005 tag
= ATA_TAG_INTERNAL
;
1009 if (test_and_set_bit(tag
, &ap
->qactive
))
1011 qc
= __ata_qc_from_tag(ap
, tag
);
1019 preempted_tag
= ap
->active_tag
;
1020 ap
->active_tag
= ATA_TAG_POISON
;
1022 /* prepare & issue qc */
1025 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1026 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1027 qc
->dma_dir
= dma_dir
;
1028 if (dma_dir
!= DMA_NONE
) {
1029 ata_sg_init_one(qc
, buf
, buflen
);
1030 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1033 qc
->private_data
= &wait
;
1034 qc
->complete_fn
= ata_qc_complete_internal
;
1038 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1040 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1042 ata_port_flush_task(ap
);
1045 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1047 /* We're racing with irq here. If we lose, the
1048 * following test prevents us from completing the qc
1049 * twice. If we win, the port is frozen and will be
1050 * cleaned up by ->post_internal_cmd().
1052 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1053 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1055 if (ap
->ops
->error_handler
)
1056 ata_port_freeze(ap
);
1058 ata_qc_complete(qc
);
1060 ata_dev_printk(dev
, KERN_WARNING
,
1061 "qc timeout (cmd 0x%x)\n", command
);
1064 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1067 /* do post_internal_cmd */
1068 if (ap
->ops
->post_internal_cmd
)
1069 ap
->ops
->post_internal_cmd(qc
);
1071 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1072 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1073 "internal command, assuming AC_ERR_OTHER\n");
1074 qc
->err_mask
|= AC_ERR_OTHER
;
1078 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1080 *tf
= qc
->result_tf
;
1081 err_mask
= qc
->err_mask
;
1084 ap
->active_tag
= preempted_tag
;
1086 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1087 * Until those drivers are fixed, we detect the condition
1088 * here, fail the command with AC_ERR_SYSTEM and reenable the
1091 * Note that this doesn't change any behavior as internal
1092 * command failure results in disabling the device in the
1093 * higher layer for LLDDs without new reset/EH callbacks.
1095 * Kill the following code as soon as those drivers are fixed.
1097 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1098 err_mask
|= AC_ERR_SYSTEM
;
1102 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1108 * ata_pio_need_iordy - check if iordy needed
1111 * Check if the current speed of the device requires IORDY. Used
1112 * by various controllers for chip configuration.
1115 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1118 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1125 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1127 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1128 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1129 /* Is the speed faster than the drive allows non IORDY ? */
1131 /* This is cycle times not frequency - watch the logic! */
1132 if (pio
> 240) /* PIO2 is 240nS per cycle */
1141 * ata_dev_read_id - Read ID data from the specified device
1142 * @dev: target device
1143 * @p_class: pointer to class of the target device (may be changed)
1144 * @post_reset: is this read ID post-reset?
1145 * @id: buffer to read IDENTIFY data into
1147 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1148 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1149 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1150 * for pre-ATA4 drives.
1153 * Kernel thread context (may sleep)
1156 * 0 on success, -errno otherwise.
1158 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1159 int post_reset
, u16
*id
)
1161 struct ata_port
*ap
= dev
->ap
;
1162 unsigned int class = *p_class
;
1163 struct ata_taskfile tf
;
1164 unsigned int err_mask
= 0;
1168 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1170 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1173 ata_tf_init(dev
, &tf
);
1177 tf
.command
= ATA_CMD_ID_ATA
;
1180 tf
.command
= ATA_CMD_ID_ATAPI
;
1184 reason
= "unsupported class";
1188 tf
.protocol
= ATA_PROT_PIO
;
1190 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1191 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1194 reason
= "I/O error";
1198 swap_buf_le16(id
, ATA_ID_WORDS
);
1201 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1203 reason
= "device reports illegal type";
1207 if (post_reset
&& class == ATA_DEV_ATA
) {
1209 * The exact sequence expected by certain pre-ATA4 drives is:
1212 * INITIALIZE DEVICE PARAMETERS
1214 * Some drives were very specific about that exact sequence.
1216 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1217 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1220 reason
= "INIT_DEV_PARAMS failed";
1224 /* current CHS translation info (id[53-58]) might be
1225 * changed. reread the identify device info.
1237 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1238 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1242 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1244 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1248 * ata_dev_configure - Configure the specified ATA/ATAPI device
1249 * @dev: Target device to configure
1250 * @print_info: Enable device info printout
1252 * Configure @dev according to @dev->id. Generic and low-level
1253 * driver specific fixups are also applied.
1256 * Kernel thread context (may sleep)
1259 * 0 on success, -errno otherwise
1261 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1263 struct ata_port
*ap
= dev
->ap
;
1264 const u16
*id
= dev
->id
;
1265 unsigned int xfer_mask
;
1268 if (!ata_dev_enabled(dev
)) {
1269 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1270 ap
->id
, dev
->devno
);
1274 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1276 /* print device capabilities */
1278 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1279 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1280 id
[49], id
[82], id
[83], id
[84],
1281 id
[85], id
[86], id
[87], id
[88]);
1283 /* initialize to-be-configured parameters */
1284 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1285 dev
->max_sectors
= 0;
1293 * common ATA, ATAPI feature tests
1296 /* find max transfer mode; for printk only */
1297 xfer_mask
= ata_id_xfermask(id
);
1301 /* ATA-specific feature tests */
1302 if (dev
->class == ATA_DEV_ATA
) {
1303 dev
->n_sectors
= ata_id_n_sectors(id
);
1305 if (ata_id_has_lba(id
)) {
1306 const char *lba_desc
;
1309 dev
->flags
|= ATA_DFLAG_LBA
;
1310 if (ata_id_has_lba48(id
)) {
1311 dev
->flags
|= ATA_DFLAG_LBA48
;
1315 /* print device info to dmesg */
1317 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1318 "max %s, %Lu sectors: %s\n",
1319 ata_id_major_version(id
),
1320 ata_mode_string(xfer_mask
),
1321 (unsigned long long)dev
->n_sectors
,
1326 /* Default translation */
1327 dev
->cylinders
= id
[1];
1329 dev
->sectors
= id
[6];
1331 if (ata_id_current_chs_valid(id
)) {
1332 /* Current CHS translation is valid. */
1333 dev
->cylinders
= id
[54];
1334 dev
->heads
= id
[55];
1335 dev
->sectors
= id
[56];
1338 /* print device info to dmesg */
1340 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1341 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1342 ata_id_major_version(id
),
1343 ata_mode_string(xfer_mask
),
1344 (unsigned long long)dev
->n_sectors
,
1345 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1351 /* ATAPI-specific feature tests */
1352 else if (dev
->class == ATA_DEV_ATAPI
) {
1353 rc
= atapi_cdb_len(id
);
1354 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1355 ata_dev_printk(dev
, KERN_WARNING
,
1356 "unsupported CDB len\n");
1360 dev
->cdb_len
= (unsigned int) rc
;
1362 /* print device info to dmesg */
1364 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s\n",
1365 ata_mode_string(xfer_mask
));
1368 ap
->host
->max_cmd_len
= 0;
1369 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1370 ap
->host
->max_cmd_len
= max_t(unsigned int,
1371 ap
->host
->max_cmd_len
,
1372 ap
->device
[i
].cdb_len
);
1374 /* limit bridge transfers to udma5, 200 sectors */
1375 if (ata_dev_knobble(dev
)) {
1377 ata_dev_printk(dev
, KERN_INFO
,
1378 "applying bridge limits\n");
1379 dev
->udma_mask
&= ATA_UDMA5
;
1380 dev
->max_sectors
= ATA_MAX_SECTORS
;
1383 if (ap
->ops
->dev_config
)
1384 ap
->ops
->dev_config(ap
, dev
);
1386 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1390 DPRINTK("EXIT, err\n");
1395 * ata_bus_probe - Reset and probe ATA bus
1398 * Master ATA bus probing function. Initiates a hardware-dependent
1399 * bus reset, then attempts to identify any devices found on
1403 * PCI/etc. bus probe sem.
1406 * Zero on success, negative errno otherwise.
1409 static int ata_bus_probe(struct ata_port
*ap
)
1411 unsigned int classes
[ATA_MAX_DEVICES
];
1412 int tries
[ATA_MAX_DEVICES
];
1413 int i
, rc
, down_xfermask
;
1414 struct ata_device
*dev
;
1418 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1419 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1424 /* reset and determine device classes */
1425 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1426 classes
[i
] = ATA_DEV_UNKNOWN
;
1428 if (ap
->ops
->probe_reset
) {
1429 rc
= ap
->ops
->probe_reset(ap
, classes
);
1431 ata_port_printk(ap
, KERN_ERR
,
1432 "reset failed (errno=%d)\n", rc
);
1436 ap
->ops
->phy_reset(ap
);
1438 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1439 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1440 classes
[i
] = ap
->device
[i
].class;
1441 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1447 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1448 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1449 classes
[i
] = ATA_DEV_NONE
;
1451 /* read IDENTIFY page and configure devices */
1452 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1453 dev
= &ap
->device
[i
];
1456 dev
->class = classes
[i
];
1458 if (!ata_dev_enabled(dev
))
1461 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1465 rc
= ata_dev_configure(dev
, 1);
1470 /* configure transfer mode */
1471 rc
= ata_set_mode(ap
, &dev
);
1477 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1478 if (ata_dev_enabled(&ap
->device
[i
]))
1481 /* no device present, disable port */
1482 ata_port_disable(ap
);
1483 ap
->ops
->port_disable(ap
);
1490 tries
[dev
->devno
] = 0;
1493 sata_down_spd_limit(ap
);
1496 tries
[dev
->devno
]--;
1497 if (down_xfermask
&&
1498 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1499 tries
[dev
->devno
] = 0;
1502 if (!tries
[dev
->devno
]) {
1503 ata_down_xfermask_limit(dev
, 1);
1504 ata_dev_disable(dev
);
1511 * ata_port_probe - Mark port as enabled
1512 * @ap: Port for which we indicate enablement
1514 * Modify @ap data structure such that the system
1515 * thinks that the entire port is enabled.
1517 * LOCKING: host_set lock, or some other form of
1521 void ata_port_probe(struct ata_port
*ap
)
1523 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1527 * sata_print_link_status - Print SATA link status
1528 * @ap: SATA port to printk link status about
1530 * This function prints link speed and status of a SATA link.
1535 static void sata_print_link_status(struct ata_port
*ap
)
1537 u32 sstatus
, scontrol
, tmp
;
1539 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1541 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1543 if (ata_port_online(ap
)) {
1544 tmp
= (sstatus
>> 4) & 0xf;
1545 ata_port_printk(ap
, KERN_INFO
,
1546 "SATA link up %s (SStatus %X SControl %X)\n",
1547 sata_spd_string(tmp
), sstatus
, scontrol
);
1549 ata_port_printk(ap
, KERN_INFO
,
1550 "SATA link down (SStatus %X SControl %X)\n",
1556 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1557 * @ap: SATA port associated with target SATA PHY.
1559 * This function issues commands to standard SATA Sxxx
1560 * PHY registers, to wake up the phy (and device), and
1561 * clear any reset condition.
1564 * PCI/etc. bus probe sem.
1567 void __sata_phy_reset(struct ata_port
*ap
)
1570 unsigned long timeout
= jiffies
+ (HZ
* 5);
1572 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1573 /* issue phy wake/reset */
1574 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1575 /* Couldn't find anything in SATA I/II specs, but
1576 * AHCI-1.1 10.4.2 says at least 1 ms. */
1579 /* phy wake/clear reset */
1580 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1582 /* wait for phy to become ready, if necessary */
1585 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1586 if ((sstatus
& 0xf) != 1)
1588 } while (time_before(jiffies
, timeout
));
1590 /* print link status */
1591 sata_print_link_status(ap
);
1593 /* TODO: phy layer with polling, timeouts, etc. */
1594 if (!ata_port_offline(ap
))
1597 ata_port_disable(ap
);
1599 if (ap
->flags
& ATA_FLAG_DISABLED
)
1602 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1603 ata_port_disable(ap
);
1607 ap
->cbl
= ATA_CBL_SATA
;
1611 * sata_phy_reset - Reset SATA bus.
1612 * @ap: SATA port associated with target SATA PHY.
1614 * This function resets the SATA bus, and then probes
1615 * the bus for devices.
1618 * PCI/etc. bus probe sem.
1621 void sata_phy_reset(struct ata_port
*ap
)
1623 __sata_phy_reset(ap
);
1624 if (ap
->flags
& ATA_FLAG_DISABLED
)
1630 * ata_dev_pair - return other device on cable
1633 * Obtain the other device on the same cable, or if none is
1634 * present NULL is returned
1637 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1639 struct ata_port
*ap
= adev
->ap
;
1640 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1641 if (!ata_dev_enabled(pair
))
1647 * ata_port_disable - Disable port.
1648 * @ap: Port to be disabled.
1650 * Modify @ap data structure such that the system
1651 * thinks that the entire port is disabled, and should
1652 * never attempt to probe or communicate with devices
1655 * LOCKING: host_set lock, or some other form of
1659 void ata_port_disable(struct ata_port
*ap
)
1661 ap
->device
[0].class = ATA_DEV_NONE
;
1662 ap
->device
[1].class = ATA_DEV_NONE
;
1663 ap
->flags
|= ATA_FLAG_DISABLED
;
1667 * sata_down_spd_limit - adjust SATA spd limit downward
1668 * @ap: Port to adjust SATA spd limit for
1670 * Adjust SATA spd limit of @ap downward. Note that this
1671 * function only adjusts the limit. The change must be applied
1672 * using sata_set_spd().
1675 * Inherited from caller.
1678 * 0 on success, negative errno on failure
1680 int sata_down_spd_limit(struct ata_port
*ap
)
1682 u32 sstatus
, spd
, mask
;
1685 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1689 mask
= ap
->sata_spd_limit
;
1692 highbit
= fls(mask
) - 1;
1693 mask
&= ~(1 << highbit
);
1695 spd
= (sstatus
>> 4) & 0xf;
1699 mask
&= (1 << spd
) - 1;
1703 ap
->sata_spd_limit
= mask
;
1705 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1706 sata_spd_string(fls(mask
)));
1711 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1715 if (ap
->sata_spd_limit
== UINT_MAX
)
1718 limit
= fls(ap
->sata_spd_limit
);
1720 spd
= (*scontrol
>> 4) & 0xf;
1721 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1723 return spd
!= limit
;
1727 * sata_set_spd_needed - is SATA spd configuration needed
1728 * @ap: Port in question
1730 * Test whether the spd limit in SControl matches
1731 * @ap->sata_spd_limit. This function is used to determine
1732 * whether hardreset is necessary to apply SATA spd
1736 * Inherited from caller.
1739 * 1 if SATA spd configuration is needed, 0 otherwise.
1741 int sata_set_spd_needed(struct ata_port
*ap
)
1745 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1748 return __sata_set_spd_needed(ap
, &scontrol
);
1752 * sata_set_spd - set SATA spd according to spd limit
1753 * @ap: Port to set SATA spd for
1755 * Set SATA spd of @ap according to sata_spd_limit.
1758 * Inherited from caller.
1761 * 0 if spd doesn't need to be changed, 1 if spd has been
1762 * changed. Negative errno if SCR registers are inaccessible.
1764 int sata_set_spd(struct ata_port
*ap
)
1769 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1772 if (!__sata_set_spd_needed(ap
, &scontrol
))
1775 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1782 * This mode timing computation functionality is ported over from
1783 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1786 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1787 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1788 * for PIO 5, which is a nonstandard extension and UDMA6, which
1789 * is currently supported only by Maxtor drives.
1792 static const struct ata_timing ata_timing
[] = {
1794 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1795 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1796 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1797 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1799 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1800 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1801 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1803 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1805 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1806 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1807 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1809 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1810 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1811 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1813 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1814 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1815 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1817 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1818 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1819 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1821 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1826 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1827 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1829 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1831 q
->setup
= EZ(t
->setup
* 1000, T
);
1832 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1833 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1834 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1835 q
->active
= EZ(t
->active
* 1000, T
);
1836 q
->recover
= EZ(t
->recover
* 1000, T
);
1837 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1838 q
->udma
= EZ(t
->udma
* 1000, UT
);
1841 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1842 struct ata_timing
*m
, unsigned int what
)
1844 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1845 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1846 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1847 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1848 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1849 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1850 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1851 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1854 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1856 const struct ata_timing
*t
;
1858 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1859 if (t
->mode
== 0xFF)
1864 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1865 struct ata_timing
*t
, int T
, int UT
)
1867 const struct ata_timing
*s
;
1868 struct ata_timing p
;
1874 if (!(s
= ata_timing_find_mode(speed
)))
1877 memcpy(t
, s
, sizeof(*s
));
1880 * If the drive is an EIDE drive, it can tell us it needs extended
1881 * PIO/MW_DMA cycle timing.
1884 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1885 memset(&p
, 0, sizeof(p
));
1886 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1887 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1888 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1889 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1890 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1892 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1896 * Convert the timing to bus clock counts.
1899 ata_timing_quantize(t
, t
, T
, UT
);
1902 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1903 * S.M.A.R.T * and some other commands. We have to ensure that the
1904 * DMA cycle timing is slower/equal than the fastest PIO timing.
1907 if (speed
> XFER_PIO_4
) {
1908 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1909 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1913 * Lengthen active & recovery time so that cycle time is correct.
1916 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1917 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1918 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1921 if (t
->active
+ t
->recover
< t
->cycle
) {
1922 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1923 t
->recover
= t
->cycle
- t
->active
;
1930 * ata_down_xfermask_limit - adjust dev xfer masks downward
1931 * @dev: Device to adjust xfer masks
1932 * @force_pio0: Force PIO0
1934 * Adjust xfer masks of @dev downward. Note that this function
1935 * does not apply the change. Invoking ata_set_mode() afterwards
1936 * will apply the limit.
1939 * Inherited from caller.
1942 * 0 on success, negative errno on failure
1944 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1946 unsigned long xfer_mask
;
1949 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1954 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1955 if (xfer_mask
& ATA_MASK_UDMA
)
1956 xfer_mask
&= ~ATA_MASK_MWDMA
;
1958 highbit
= fls(xfer_mask
) - 1;
1959 xfer_mask
&= ~(1 << highbit
);
1961 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1965 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1968 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
1969 ata_mode_string(xfer_mask
));
1977 static int ata_dev_set_mode(struct ata_device
*dev
)
1979 unsigned int err_mask
;
1982 dev
->flags
&= ~ATA_DFLAG_PIO
;
1983 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1984 dev
->flags
|= ATA_DFLAG_PIO
;
1986 err_mask
= ata_dev_set_xfermode(dev
);
1988 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
1989 "(err_mask=0x%x)\n", err_mask
);
1993 rc
= ata_dev_revalidate(dev
, 0);
1997 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1998 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2000 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2001 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2006 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2007 * @ap: port on which timings will be programmed
2008 * @r_failed_dev: out paramter for failed device
2010 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2011 * ata_set_mode() fails, pointer to the failing device is
2012 * returned in @r_failed_dev.
2015 * PCI/etc. bus probe sem.
2018 * 0 on success, negative errno otherwise
2020 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2022 struct ata_device
*dev
;
2023 int i
, rc
= 0, used_dma
= 0, found
= 0;
2025 /* has private set_mode? */
2026 if (ap
->ops
->set_mode
) {
2027 /* FIXME: make ->set_mode handle no device case and
2028 * return error code and failing device on failure.
2030 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2031 if (ata_dev_enabled(&ap
->device
[i
])) {
2032 ap
->ops
->set_mode(ap
);
2039 /* step 1: calculate xfer_mask */
2040 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2041 unsigned int pio_mask
, dma_mask
;
2043 dev
= &ap
->device
[i
];
2045 if (!ata_dev_enabled(dev
))
2048 ata_dev_xfermask(dev
);
2050 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2051 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2052 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2053 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2062 /* step 2: always set host PIO timings */
2063 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2064 dev
= &ap
->device
[i
];
2065 if (!ata_dev_enabled(dev
))
2068 if (!dev
->pio_mode
) {
2069 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2074 dev
->xfer_mode
= dev
->pio_mode
;
2075 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2076 if (ap
->ops
->set_piomode
)
2077 ap
->ops
->set_piomode(ap
, dev
);
2080 /* step 3: set host DMA timings */
2081 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2082 dev
= &ap
->device
[i
];
2084 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2087 dev
->xfer_mode
= dev
->dma_mode
;
2088 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2089 if (ap
->ops
->set_dmamode
)
2090 ap
->ops
->set_dmamode(ap
, dev
);
2093 /* step 4: update devices' xfer mode */
2094 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2095 dev
= &ap
->device
[i
];
2097 if (!ata_dev_enabled(dev
))
2100 rc
= ata_dev_set_mode(dev
);
2105 /* Record simplex status. If we selected DMA then the other
2106 * host channels are not permitted to do so.
2108 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2109 ap
->host_set
->simplex_claimed
= 1;
2111 /* step5: chip specific finalisation */
2112 if (ap
->ops
->post_set_mode
)
2113 ap
->ops
->post_set_mode(ap
);
2117 *r_failed_dev
= dev
;
2122 * ata_tf_to_host - issue ATA taskfile to host controller
2123 * @ap: port to which command is being issued
2124 * @tf: ATA taskfile register set
2126 * Issues ATA taskfile register set to ATA host controller,
2127 * with proper synchronization with interrupt handler and
2131 * spin_lock_irqsave(host_set lock)
2134 static inline void ata_tf_to_host(struct ata_port
*ap
,
2135 const struct ata_taskfile
*tf
)
2137 ap
->ops
->tf_load(ap
, tf
);
2138 ap
->ops
->exec_command(ap
, tf
);
2142 * ata_busy_sleep - sleep until BSY clears, or timeout
2143 * @ap: port containing status register to be polled
2144 * @tmout_pat: impatience timeout
2145 * @tmout: overall timeout
2147 * Sleep until ATA Status register bit BSY clears,
2148 * or a timeout occurs.
2153 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2154 unsigned long tmout_pat
, unsigned long tmout
)
2156 unsigned long timer_start
, timeout
;
2159 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2160 timer_start
= jiffies
;
2161 timeout
= timer_start
+ tmout_pat
;
2162 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2164 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2167 if (status
& ATA_BUSY
)
2168 ata_port_printk(ap
, KERN_WARNING
,
2169 "port is slow to respond, please be patient\n");
2171 timeout
= timer_start
+ tmout
;
2172 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2174 status
= ata_chk_status(ap
);
2177 if (status
& ATA_BUSY
) {
2178 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2179 "(%lu secs)\n", tmout
/ HZ
);
2186 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2188 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2189 unsigned int dev0
= devmask
& (1 << 0);
2190 unsigned int dev1
= devmask
& (1 << 1);
2191 unsigned long timeout
;
2193 /* if device 0 was found in ata_devchk, wait for its
2197 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2199 /* if device 1 was found in ata_devchk, wait for
2200 * register access, then wait for BSY to clear
2202 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2206 ap
->ops
->dev_select(ap
, 1);
2207 if (ap
->flags
& ATA_FLAG_MMIO
) {
2208 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2209 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2211 nsect
= inb(ioaddr
->nsect_addr
);
2212 lbal
= inb(ioaddr
->lbal_addr
);
2214 if ((nsect
== 1) && (lbal
== 1))
2216 if (time_after(jiffies
, timeout
)) {
2220 msleep(50); /* give drive a breather */
2223 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2225 /* is all this really necessary? */
2226 ap
->ops
->dev_select(ap
, 0);
2228 ap
->ops
->dev_select(ap
, 1);
2230 ap
->ops
->dev_select(ap
, 0);
2233 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2234 unsigned int devmask
)
2236 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2238 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2240 /* software reset. causes dev0 to be selected */
2241 if (ap
->flags
& ATA_FLAG_MMIO
) {
2242 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2243 udelay(20); /* FIXME: flush */
2244 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2245 udelay(20); /* FIXME: flush */
2246 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2248 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2250 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2252 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2255 /* spec mandates ">= 2ms" before checking status.
2256 * We wait 150ms, because that was the magic delay used for
2257 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2258 * between when the ATA command register is written, and then
2259 * status is checked. Because waiting for "a while" before
2260 * checking status is fine, post SRST, we perform this magic
2261 * delay here as well.
2263 * Old drivers/ide uses the 2mS rule and then waits for ready
2267 /* Before we perform post reset processing we want to see if
2268 * the bus shows 0xFF because the odd clown forgets the D7
2269 * pulldown resistor.
2271 if (ata_check_status(ap
) == 0xFF) {
2272 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2273 return AC_ERR_OTHER
;
2276 ata_bus_post_reset(ap
, devmask
);
2282 * ata_bus_reset - reset host port and associated ATA channel
2283 * @ap: port to reset
2285 * This is typically the first time we actually start issuing
2286 * commands to the ATA channel. We wait for BSY to clear, then
2287 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2288 * result. Determine what devices, if any, are on the channel
2289 * by looking at the device 0/1 error register. Look at the signature
2290 * stored in each device's taskfile registers, to determine if
2291 * the device is ATA or ATAPI.
2294 * PCI/etc. bus probe sem.
2295 * Obtains host_set lock.
2298 * Sets ATA_FLAG_DISABLED if bus reset fails.
2301 void ata_bus_reset(struct ata_port
*ap
)
2303 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2304 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2306 unsigned int dev0
, dev1
= 0, devmask
= 0;
2308 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2310 /* determine if device 0/1 are present */
2311 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2314 dev0
= ata_devchk(ap
, 0);
2316 dev1
= ata_devchk(ap
, 1);
2320 devmask
|= (1 << 0);
2322 devmask
|= (1 << 1);
2324 /* select device 0 again */
2325 ap
->ops
->dev_select(ap
, 0);
2327 /* issue bus reset */
2328 if (ap
->flags
& ATA_FLAG_SRST
)
2329 if (ata_bus_softreset(ap
, devmask
))
2333 * determine by signature whether we have ATA or ATAPI devices
2335 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2336 if ((slave_possible
) && (err
!= 0x81))
2337 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2339 /* re-enable interrupts */
2340 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2343 /* is double-select really necessary? */
2344 if (ap
->device
[1].class != ATA_DEV_NONE
)
2345 ap
->ops
->dev_select(ap
, 1);
2346 if (ap
->device
[0].class != ATA_DEV_NONE
)
2347 ap
->ops
->dev_select(ap
, 0);
2349 /* if no devices were detected, disable this port */
2350 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2351 (ap
->device
[1].class == ATA_DEV_NONE
))
2354 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2355 /* set up device control for ATA_FLAG_SATA_RESET */
2356 if (ap
->flags
& ATA_FLAG_MMIO
)
2357 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2359 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2366 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2367 ap
->ops
->port_disable(ap
);
2372 static int sata_phy_resume(struct ata_port
*ap
)
2374 unsigned long timeout
= jiffies
+ (HZ
* 5);
2375 u32 scontrol
, sstatus
;
2378 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2381 scontrol
= (scontrol
& 0x0f0) | 0x300;
2383 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2386 /* Wait for phy to become ready, if necessary. */
2389 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2391 if ((sstatus
& 0xf) != 1)
2393 } while (time_before(jiffies
, timeout
));
2399 * ata_std_probeinit - initialize probing
2400 * @ap: port to be probed
2402 * @ap is about to be probed. Initialize it. This function is
2403 * to be used as standard callback for ata_drive_probe_reset().
2405 * NOTE!!! Do not use this function as probeinit if a low level
2406 * driver implements only hardreset. Just pass NULL as probeinit
2407 * in that case. Using this function is probably okay but doing
2408 * so makes reset sequence different from the original
2409 * ->phy_reset implementation and Jeff nervous. :-P
2411 void ata_std_probeinit(struct ata_port
*ap
)
2416 sata_phy_resume(ap
);
2418 /* init sata_spd_limit to the current value */
2419 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2420 int spd
= (scontrol
>> 4) & 0xf;
2421 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2424 /* wait for device */
2425 if (ata_port_online(ap
))
2426 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2430 * ata_std_softreset - reset host port via ATA SRST
2431 * @ap: port to reset
2432 * @classes: resulting classes of attached devices
2434 * Reset host port using ATA SRST. This function is to be used
2435 * as standard callback for ata_drive_*_reset() functions.
2438 * Kernel thread context (may sleep)
2441 * 0 on success, -errno otherwise.
2443 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2445 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2446 unsigned int devmask
= 0, err_mask
;
2451 if (ata_port_offline(ap
)) {
2452 classes
[0] = ATA_DEV_NONE
;
2456 /* determine if device 0/1 are present */
2457 if (ata_devchk(ap
, 0))
2458 devmask
|= (1 << 0);
2459 if (slave_possible
&& ata_devchk(ap
, 1))
2460 devmask
|= (1 << 1);
2462 /* select device 0 again */
2463 ap
->ops
->dev_select(ap
, 0);
2465 /* issue bus reset */
2466 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2467 err_mask
= ata_bus_softreset(ap
, devmask
);
2469 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2474 /* determine by signature whether we have ATA or ATAPI devices */
2475 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2476 if (slave_possible
&& err
!= 0x81)
2477 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2480 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2485 * sata_std_hardreset - reset host port via SATA phy reset
2486 * @ap: port to reset
2487 * @class: resulting class of attached device
2489 * SATA phy-reset host port using DET bits of SControl register.
2490 * This function is to be used as standard callback for
2491 * ata_drive_*_reset().
2494 * Kernel thread context (may sleep)
2497 * 0 on success, -errno otherwise.
2499 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2506 if (sata_set_spd_needed(ap
)) {
2507 /* SATA spec says nothing about how to reconfigure
2508 * spd. To be on the safe side, turn off phy during
2509 * reconfiguration. This works for at least ICH7 AHCI
2512 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2515 scontrol
= (scontrol
& 0x0f0) | 0x302;
2517 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2523 /* issue phy wake/reset */
2524 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2527 scontrol
= (scontrol
& 0x0f0) | 0x301;
2529 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2532 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2533 * 10.4.2 says at least 1 ms.
2537 /* bring phy back */
2538 sata_phy_resume(ap
);
2540 /* TODO: phy layer with polling, timeouts, etc. */
2541 if (ata_port_offline(ap
)) {
2542 *class = ATA_DEV_NONE
;
2543 DPRINTK("EXIT, link offline\n");
2547 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2548 ata_port_printk(ap
, KERN_ERR
,
2549 "COMRESET failed (device not ready)\n");
2553 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2555 *class = ata_dev_try_classify(ap
, 0, NULL
);
2557 DPRINTK("EXIT, class=%u\n", *class);
2562 * ata_std_postreset - standard postreset callback
2563 * @ap: the target ata_port
2564 * @classes: classes of attached devices
2566 * This function is invoked after a successful reset. Note that
2567 * the device might have been reset more than once using
2568 * different reset methods before postreset is invoked.
2570 * This function is to be used as standard callback for
2571 * ata_drive_*_reset().
2574 * Kernel thread context (may sleep)
2576 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2582 /* print link status */
2583 sata_print_link_status(ap
);
2586 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2587 sata_scr_write(ap
, SCR_ERROR
, serror
);
2589 /* re-enable interrupts */
2590 if (!ap
->ops
->error_handler
) {
2591 /* FIXME: hack. create a hook instead */
2592 if (ap
->ioaddr
.ctl_addr
)
2596 /* is double-select really necessary? */
2597 if (classes
[0] != ATA_DEV_NONE
)
2598 ap
->ops
->dev_select(ap
, 1);
2599 if (classes
[1] != ATA_DEV_NONE
)
2600 ap
->ops
->dev_select(ap
, 0);
2602 /* bail out if no device is present */
2603 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2604 DPRINTK("EXIT, no device\n");
2608 /* set up device control */
2609 if (ap
->ioaddr
.ctl_addr
) {
2610 if (ap
->flags
& ATA_FLAG_MMIO
)
2611 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2613 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2620 * ata_std_probe_reset - standard probe reset method
2621 * @ap: prot to perform probe-reset
2622 * @classes: resulting classes of attached devices
2624 * The stock off-the-shelf ->probe_reset method.
2627 * Kernel thread context (may sleep)
2630 * 0 on success, -errno otherwise.
2632 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2634 ata_reset_fn_t hardreset
;
2637 if (sata_scr_valid(ap
))
2638 hardreset
= sata_std_hardreset
;
2640 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2641 ata_std_softreset
, hardreset
,
2642 ata_std_postreset
, classes
);
2645 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2646 unsigned int *classes
)
2650 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2651 classes
[i
] = ATA_DEV_UNKNOWN
;
2653 rc
= reset(ap
, classes
);
2657 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2658 * is complete and convert all ATA_DEV_UNKNOWN to
2661 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2662 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2665 if (i
< ATA_MAX_DEVICES
)
2666 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2667 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2668 classes
[i
] = ATA_DEV_NONE
;
2674 * ata_drive_probe_reset - Perform probe reset with given methods
2675 * @ap: port to reset
2676 * @probeinit: probeinit method (can be NULL)
2677 * @softreset: softreset method (can be NULL)
2678 * @hardreset: hardreset method (can be NULL)
2679 * @postreset: postreset method (can be NULL)
2680 * @classes: resulting classes of attached devices
2682 * Reset the specified port and classify attached devices using
2683 * given methods. This function prefers softreset but tries all
2684 * possible reset sequences to reset and classify devices. This
2685 * function is intended to be used for constructing ->probe_reset
2686 * callback by low level drivers.
2688 * Reset methods should follow the following rules.
2690 * - Return 0 on sucess, -errno on failure.
2691 * - If classification is supported, fill classes[] with
2692 * recognized class codes.
2693 * - If classification is not supported, leave classes[] alone.
2696 * Kernel thread context (may sleep)
2699 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2700 * if classification fails, and any error code from reset
2703 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2704 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2705 ata_postreset_fn_t postreset
, unsigned int *classes
)
2709 ata_eh_freeze_port(ap
);
2714 if (softreset
&& !sata_set_spd_needed(ap
)) {
2715 rc
= ata_do_reset(ap
, softreset
, classes
);
2716 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2718 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2719 "will try hardreset in 5 secs\n");
2727 rc
= ata_do_reset(ap
, hardreset
, classes
);
2729 if (classes
[0] != ATA_DEV_UNKNOWN
)
2734 if (sata_down_spd_limit(ap
))
2737 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2738 "will retry in 5 secs\n");
2743 ata_port_printk(ap
, KERN_INFO
,
2744 "hardreset succeeded without classification, "
2745 "will retry softreset in 5 secs\n");
2748 rc
= ata_do_reset(ap
, softreset
, classes
);
2754 postreset(ap
, classes
);
2756 ata_eh_thaw_port(ap
);
2758 if (classes
[0] == ATA_DEV_UNKNOWN
)
2765 * ata_dev_same_device - Determine whether new ID matches configured device
2766 * @dev: device to compare against
2767 * @new_class: class of the new device
2768 * @new_id: IDENTIFY page of the new device
2770 * Compare @new_class and @new_id against @dev and determine
2771 * whether @dev is the device indicated by @new_class and
2778 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2780 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2783 const u16
*old_id
= dev
->id
;
2784 unsigned char model
[2][41], serial
[2][21];
2787 if (dev
->class != new_class
) {
2788 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2789 dev
->class, new_class
);
2793 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2794 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2795 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2796 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2797 new_n_sectors
= ata_id_n_sectors(new_id
);
2799 if (strcmp(model
[0], model
[1])) {
2800 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2801 "'%s' != '%s'\n", model
[0], model
[1]);
2805 if (strcmp(serial
[0], serial
[1])) {
2806 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2807 "'%s' != '%s'\n", serial
[0], serial
[1]);
2811 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2812 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2814 (unsigned long long)dev
->n_sectors
,
2815 (unsigned long long)new_n_sectors
);
2823 * ata_dev_revalidate - Revalidate ATA device
2824 * @dev: device to revalidate
2825 * @post_reset: is this revalidation after reset?
2827 * Re-read IDENTIFY page and make sure @dev is still attached to
2831 * Kernel thread context (may sleep)
2834 * 0 on success, negative errno otherwise
2836 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2838 unsigned int class = dev
->class;
2839 u16
*id
= (void *)dev
->ap
->sector_buf
;
2842 if (!ata_dev_enabled(dev
)) {
2848 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2852 /* is the device still there? */
2853 if (!ata_dev_same_device(dev
, class, id
)) {
2858 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2860 /* configure device according to the new ID */
2861 rc
= ata_dev_configure(dev
, 0);
2866 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2870 static const char * const ata_dma_blacklist
[] = {
2871 "WDC AC11000H", NULL
,
2872 "WDC AC22100H", NULL
,
2873 "WDC AC32500H", NULL
,
2874 "WDC AC33100H", NULL
,
2875 "WDC AC31600H", NULL
,
2876 "WDC AC32100H", "24.09P07",
2877 "WDC AC23200L", "21.10N21",
2878 "Compaq CRD-8241B", NULL
,
2883 "SanDisk SDP3B", NULL
,
2884 "SanDisk SDP3B-64", NULL
,
2885 "SANYO CD-ROM CRD", NULL
,
2886 "HITACHI CDR-8", NULL
,
2887 "HITACHI CDR-8335", NULL
,
2888 "HITACHI CDR-8435", NULL
,
2889 "Toshiba CD-ROM XM-6202B", NULL
,
2890 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2892 "E-IDE CD-ROM CR-840", NULL
,
2893 "CD-ROM Drive/F5A", NULL
,
2894 "WPI CDD-820", NULL
,
2895 "SAMSUNG CD-ROM SC-148C", NULL
,
2896 "SAMSUNG CD-ROM SC", NULL
,
2897 "SanDisk SDP3B-64", NULL
,
2898 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2899 "_NEC DV5800A", NULL
,
2900 "SAMSUNG CD-ROM SN-124", "N001"
2903 static int ata_strim(char *s
, size_t len
)
2905 len
= strnlen(s
, len
);
2907 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2908 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2915 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2917 unsigned char model_num
[40];
2918 unsigned char model_rev
[16];
2919 unsigned int nlen
, rlen
;
2922 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2924 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2926 nlen
= ata_strim(model_num
, sizeof(model_num
));
2927 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2929 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2930 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2931 if (ata_dma_blacklist
[i
+1] == NULL
)
2933 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2941 * ata_dev_xfermask - Compute supported xfermask of the given device
2942 * @dev: Device to compute xfermask for
2944 * Compute supported xfermask of @dev and store it in
2945 * dev->*_mask. This function is responsible for applying all
2946 * known limits including host controller limits, device
2949 * FIXME: The current implementation limits all transfer modes to
2950 * the fastest of the lowested device on the port. This is not
2951 * required on most controllers.
2956 static void ata_dev_xfermask(struct ata_device
*dev
)
2958 struct ata_port
*ap
= dev
->ap
;
2959 struct ata_host_set
*hs
= ap
->host_set
;
2960 unsigned long xfer_mask
;
2963 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2964 ap
->mwdma_mask
, ap
->udma_mask
);
2966 /* Apply cable rule here. Don't apply it early because when
2967 * we handle hot plug the cable type can itself change.
2969 if (ap
->cbl
== ATA_CBL_PATA40
)
2970 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2972 /* FIXME: Use port-wide xfermask for now */
2973 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2974 struct ata_device
*d
= &ap
->device
[i
];
2976 if (ata_dev_absent(d
))
2979 if (ata_dev_disabled(d
)) {
2980 /* to avoid violating device selection timing */
2981 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2982 UINT_MAX
, UINT_MAX
);
2986 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2987 d
->mwdma_mask
, d
->udma_mask
);
2988 xfer_mask
&= ata_id_xfermask(d
->id
);
2989 if (ata_dma_blacklisted(d
))
2990 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2993 if (ata_dma_blacklisted(dev
))
2994 ata_dev_printk(dev
, KERN_WARNING
,
2995 "device is on DMA blacklist, disabling DMA\n");
2997 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2998 if (hs
->simplex_claimed
)
2999 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3002 if (ap
->ops
->mode_filter
)
3003 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3005 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3006 &dev
->mwdma_mask
, &dev
->udma_mask
);
3010 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3011 * @dev: Device to which command will be sent
3013 * Issue SET FEATURES - XFER MODE command to device @dev
3017 * PCI/etc. bus probe sem.
3020 * 0 on success, AC_ERR_* mask otherwise.
3023 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3025 struct ata_taskfile tf
;
3026 unsigned int err_mask
;
3028 /* set up set-features taskfile */
3029 DPRINTK("set features - xfer mode\n");
3031 ata_tf_init(dev
, &tf
);
3032 tf
.command
= ATA_CMD_SET_FEATURES
;
3033 tf
.feature
= SETFEATURES_XFER
;
3034 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3035 tf
.protocol
= ATA_PROT_NODATA
;
3036 tf
.nsect
= dev
->xfer_mode
;
3038 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3040 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3045 * ata_dev_init_params - Issue INIT DEV PARAMS command
3046 * @dev: Device to which command will be sent
3047 * @heads: Number of heads
3048 * @sectors: Number of sectors
3051 * Kernel thread context (may sleep)
3054 * 0 on success, AC_ERR_* mask otherwise.
3056 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3057 u16 heads
, u16 sectors
)
3059 struct ata_taskfile tf
;
3060 unsigned int err_mask
;
3062 /* Number of sectors per track 1-255. Number of heads 1-16 */
3063 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3064 return AC_ERR_INVALID
;
3066 /* set up init dev params taskfile */
3067 DPRINTK("init dev params \n");
3069 ata_tf_init(dev
, &tf
);
3070 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3071 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3072 tf
.protocol
= ATA_PROT_NODATA
;
3074 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3076 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3078 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3083 * ata_sg_clean - Unmap DMA memory associated with command
3084 * @qc: Command containing DMA memory to be released
3086 * Unmap all mapped DMA memory associated with this command.
3089 * spin_lock_irqsave(host_set lock)
3092 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3094 struct ata_port
*ap
= qc
->ap
;
3095 struct scatterlist
*sg
= qc
->__sg
;
3096 int dir
= qc
->dma_dir
;
3097 void *pad_buf
= NULL
;
3099 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3100 WARN_ON(sg
== NULL
);
3102 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3103 WARN_ON(qc
->n_elem
> 1);
3105 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3107 /* if we padded the buffer out to 32-bit bound, and data
3108 * xfer direction is from-device, we must copy from the
3109 * pad buffer back into the supplied buffer
3111 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3112 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3114 if (qc
->flags
& ATA_QCFLAG_SG
) {
3116 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3117 /* restore last sg */
3118 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3120 struct scatterlist
*psg
= &qc
->pad_sgent
;
3121 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3122 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3123 kunmap_atomic(addr
, KM_IRQ0
);
3127 dma_unmap_single(ap
->dev
,
3128 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3131 sg
->length
+= qc
->pad_len
;
3133 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3134 pad_buf
, qc
->pad_len
);
3137 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3142 * ata_fill_sg - Fill PCI IDE PRD table
3143 * @qc: Metadata associated with taskfile to be transferred
3145 * Fill PCI IDE PRD (scatter-gather) table with segments
3146 * associated with the current disk command.
3149 * spin_lock_irqsave(host_set lock)
3152 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3154 struct ata_port
*ap
= qc
->ap
;
3155 struct scatterlist
*sg
;
3158 WARN_ON(qc
->__sg
== NULL
);
3159 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3162 ata_for_each_sg(sg
, qc
) {
3166 /* determine if physical DMA addr spans 64K boundary.
3167 * Note h/w doesn't support 64-bit, so we unconditionally
3168 * truncate dma_addr_t to u32.
3170 addr
= (u32
) sg_dma_address(sg
);
3171 sg_len
= sg_dma_len(sg
);
3174 offset
= addr
& 0xffff;
3176 if ((offset
+ sg_len
) > 0x10000)
3177 len
= 0x10000 - offset
;
3179 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3180 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3181 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3190 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3193 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3194 * @qc: Metadata associated with taskfile to check
3196 * Allow low-level driver to filter ATA PACKET commands, returning
3197 * a status indicating whether or not it is OK to use DMA for the
3198 * supplied PACKET command.
3201 * spin_lock_irqsave(host_set lock)
3203 * RETURNS: 0 when ATAPI DMA can be used
3206 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3208 struct ata_port
*ap
= qc
->ap
;
3209 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3211 if (ap
->ops
->check_atapi_dma
)
3212 rc
= ap
->ops
->check_atapi_dma(qc
);
3217 * ata_qc_prep - Prepare taskfile for submission
3218 * @qc: Metadata associated with taskfile to be prepared
3220 * Prepare ATA taskfile for submission.
3223 * spin_lock_irqsave(host_set lock)
3225 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3227 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3233 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3236 * ata_sg_init_one - Associate command with memory buffer
3237 * @qc: Command to be associated
3238 * @buf: Memory buffer
3239 * @buflen: Length of memory buffer, in bytes.
3241 * Initialize the data-related elements of queued_cmd @qc
3242 * to point to a single memory buffer, @buf of byte length @buflen.
3245 * spin_lock_irqsave(host_set lock)
3248 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3250 struct scatterlist
*sg
;
3252 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3254 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3255 qc
->__sg
= &qc
->sgent
;
3257 qc
->orig_n_elem
= 1;
3261 sg_init_one(sg
, buf
, buflen
);
3265 * ata_sg_init - Associate command with scatter-gather table.
3266 * @qc: Command to be associated
3267 * @sg: Scatter-gather table.
3268 * @n_elem: Number of elements in s/g table.
3270 * Initialize the data-related elements of queued_cmd @qc
3271 * to point to a scatter-gather table @sg, containing @n_elem
3275 * spin_lock_irqsave(host_set lock)
3278 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3279 unsigned int n_elem
)
3281 qc
->flags
|= ATA_QCFLAG_SG
;
3283 qc
->n_elem
= n_elem
;
3284 qc
->orig_n_elem
= n_elem
;
3288 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3289 * @qc: Command with memory buffer to be mapped.
3291 * DMA-map the memory buffer associated with queued_cmd @qc.
3294 * spin_lock_irqsave(host_set lock)
3297 * Zero on success, negative on error.
3300 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3302 struct ata_port
*ap
= qc
->ap
;
3303 int dir
= qc
->dma_dir
;
3304 struct scatterlist
*sg
= qc
->__sg
;
3305 dma_addr_t dma_address
;
3308 /* we must lengthen transfers to end on a 32-bit boundary */
3309 qc
->pad_len
= sg
->length
& 3;
3311 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3312 struct scatterlist
*psg
= &qc
->pad_sgent
;
3314 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3316 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3318 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3319 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3322 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3323 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3325 sg
->length
-= qc
->pad_len
;
3326 if (sg
->length
== 0)
3329 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3330 sg
->length
, qc
->pad_len
);
3338 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3340 if (dma_mapping_error(dma_address
)) {
3342 sg
->length
+= qc
->pad_len
;
3346 sg_dma_address(sg
) = dma_address
;
3347 sg_dma_len(sg
) = sg
->length
;
3350 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3351 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3357 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3358 * @qc: Command with scatter-gather table to be mapped.
3360 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3363 * spin_lock_irqsave(host_set lock)
3366 * Zero on success, negative on error.
3370 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3372 struct ata_port
*ap
= qc
->ap
;
3373 struct scatterlist
*sg
= qc
->__sg
;
3374 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3375 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3377 VPRINTK("ENTER, ata%u\n", ap
->id
);
3378 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3380 /* we must lengthen transfers to end on a 32-bit boundary */
3381 qc
->pad_len
= lsg
->length
& 3;
3383 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3384 struct scatterlist
*psg
= &qc
->pad_sgent
;
3385 unsigned int offset
;
3387 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3389 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3392 * psg->page/offset are used to copy to-be-written
3393 * data in this function or read data in ata_sg_clean.
3395 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3396 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3397 psg
->offset
= offset_in_page(offset
);
3399 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3400 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3401 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3402 kunmap_atomic(addr
, KM_IRQ0
);
3405 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3406 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3408 lsg
->length
-= qc
->pad_len
;
3409 if (lsg
->length
== 0)
3412 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3413 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3416 pre_n_elem
= qc
->n_elem
;
3417 if (trim_sg
&& pre_n_elem
)
3426 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3428 /* restore last sg */
3429 lsg
->length
+= qc
->pad_len
;
3433 DPRINTK("%d sg elements mapped\n", n_elem
);
3436 qc
->n_elem
= n_elem
;
3442 * ata_poll_qc_complete - turn irq back on and finish qc
3443 * @qc: Command to complete
3444 * @err_mask: ATA status register content
3447 * None. (grabs host lock)
3449 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3451 struct ata_port
*ap
= qc
->ap
;
3452 unsigned long flags
;
3454 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3456 if (ap
->ops
->error_handler
) {
3457 /* EH might have kicked in while host_set lock is released */
3458 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3460 if (!(qc
->err_mask
& AC_ERR_HSM
)) {
3461 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3463 ata_qc_complete(qc
);
3465 ata_port_freeze(ap
);
3469 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3471 ata_qc_complete(qc
);
3474 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3478 * ata_pio_poll - poll using PIO, depending on current state
3479 * @qc: qc in progress
3482 * None. (executing in kernel thread context)
3485 * timeout value to use
3487 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3489 struct ata_port
*ap
= qc
->ap
;
3491 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3492 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3494 switch (ap
->hsm_task_state
) {
3497 poll_state
= HSM_ST_POLL
;
3501 case HSM_ST_LAST_POLL
:
3502 poll_state
= HSM_ST_LAST_POLL
;
3503 reg_state
= HSM_ST_LAST
;
3510 status
= ata_chk_status(ap
);
3511 if (status
& ATA_BUSY
) {
3512 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3513 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3514 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3517 ap
->hsm_task_state
= poll_state
;
3518 return ATA_SHORT_PAUSE
;
3521 ap
->hsm_task_state
= reg_state
;
3526 * ata_pio_complete - check if drive is busy or idle
3527 * @qc: qc to complete
3530 * None. (executing in kernel thread context)
3533 * Non-zero if qc completed, zero otherwise.
3535 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3537 struct ata_port
*ap
= qc
->ap
;
3541 * This is purely heuristic. This is a fast path. Sometimes when
3542 * we enter, BSY will be cleared in a chk-status or two. If not,
3543 * the drive is probably seeking or something. Snooze for a couple
3544 * msecs, then chk-status again. If still busy, fall back to
3545 * HSM_ST_POLL state.
3547 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3548 if (drv_stat
& ATA_BUSY
) {
3550 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3551 if (drv_stat
& ATA_BUSY
) {
3552 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3553 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3558 drv_stat
= ata_wait_idle(ap
);
3559 if (!ata_ok(drv_stat
)) {
3560 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3561 ap
->hsm_task_state
= HSM_ST_ERR
;
3565 ap
->hsm_task_state
= HSM_ST_IDLE
;
3567 WARN_ON(qc
->err_mask
);
3568 ata_poll_qc_complete(qc
);
3570 /* another command may start at this point */
3577 * swap_buf_le16 - swap halves of 16-bit words in place
3578 * @buf: Buffer to swap
3579 * @buf_words: Number of 16-bit words in buffer.
3581 * Swap halves of 16-bit words if needed to convert from
3582 * little-endian byte order to native cpu byte order, or
3586 * Inherited from caller.
3588 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3593 for (i
= 0; i
< buf_words
; i
++)
3594 buf
[i
] = le16_to_cpu(buf
[i
]);
3595 #endif /* __BIG_ENDIAN */
3599 * ata_mmio_data_xfer - Transfer data by MMIO
3600 * @ap: port to read/write
3602 * @buflen: buffer length
3603 * @write_data: read/write
3605 * Transfer data from/to the device data register by MMIO.
3608 * Inherited from caller.
3611 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3612 unsigned int buflen
, int write_data
)
3615 unsigned int words
= buflen
>> 1;
3616 u16
*buf16
= (u16
*) buf
;
3617 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3619 /* Transfer multiple of 2 bytes */
3621 for (i
= 0; i
< words
; i
++)
3622 writew(le16_to_cpu(buf16
[i
]), mmio
);
3624 for (i
= 0; i
< words
; i
++)
3625 buf16
[i
] = cpu_to_le16(readw(mmio
));
3628 /* Transfer trailing 1 byte, if any. */
3629 if (unlikely(buflen
& 0x01)) {
3630 u16 align_buf
[1] = { 0 };
3631 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3634 memcpy(align_buf
, trailing_buf
, 1);
3635 writew(le16_to_cpu(align_buf
[0]), mmio
);
3637 align_buf
[0] = cpu_to_le16(readw(mmio
));
3638 memcpy(trailing_buf
, align_buf
, 1);
3644 * ata_pio_data_xfer - Transfer data by PIO
3645 * @ap: port to read/write
3647 * @buflen: buffer length
3648 * @write_data: read/write
3650 * Transfer data from/to the device data register by PIO.
3653 * Inherited from caller.
3656 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3657 unsigned int buflen
, int write_data
)
3659 unsigned int words
= buflen
>> 1;
3661 /* Transfer multiple of 2 bytes */
3663 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3665 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3667 /* Transfer trailing 1 byte, if any. */
3668 if (unlikely(buflen
& 0x01)) {
3669 u16 align_buf
[1] = { 0 };
3670 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3673 memcpy(align_buf
, trailing_buf
, 1);
3674 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3676 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3677 memcpy(trailing_buf
, align_buf
, 1);
3683 * ata_data_xfer - Transfer data from/to the data register.
3684 * @ap: port to read/write
3686 * @buflen: buffer length
3687 * @do_write: read/write
3689 * Transfer data from/to the device data register.
3692 * Inherited from caller.
3695 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3696 unsigned int buflen
, int do_write
)
3698 /* Make the crap hardware pay the costs not the good stuff */
3699 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3700 unsigned long flags
;
3701 local_irq_save(flags
);
3702 if (ap
->flags
& ATA_FLAG_MMIO
)
3703 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3705 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3706 local_irq_restore(flags
);
3708 if (ap
->flags
& ATA_FLAG_MMIO
)
3709 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3711 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3716 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3717 * @qc: Command on going
3719 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3722 * Inherited from caller.
3725 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3727 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3728 struct scatterlist
*sg
= qc
->__sg
;
3729 struct ata_port
*ap
= qc
->ap
;
3731 unsigned int offset
;
3734 if (qc
->cursect
== (qc
->nsect
- 1))
3735 ap
->hsm_task_state
= HSM_ST_LAST
;
3737 page
= sg
[qc
->cursg
].page
;
3738 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3740 /* get the current page and offset */
3741 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3742 offset
%= PAGE_SIZE
;
3744 buf
= kmap(page
) + offset
;
3749 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3754 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3756 /* do the actual data transfer */
3757 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3758 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3764 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3765 * @qc: Command on going
3766 * @bytes: number of bytes
3768 * Transfer Transfer data from/to the ATAPI device.
3771 * Inherited from caller.
3775 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3777 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3778 struct scatterlist
*sg
= qc
->__sg
;
3779 struct ata_port
*ap
= qc
->ap
;
3782 unsigned int offset
, count
;
3784 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3785 ap
->hsm_task_state
= HSM_ST_LAST
;
3788 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3790 * The end of qc->sg is reached and the device expects
3791 * more data to transfer. In order not to overrun qc->sg
3792 * and fulfill length specified in the byte count register,
3793 * - for read case, discard trailing data from the device
3794 * - for write case, padding zero data to the device
3796 u16 pad_buf
[1] = { 0 };
3797 unsigned int words
= bytes
>> 1;
3800 if (words
) /* warning if bytes > 1 */
3801 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3802 "%u bytes trailing data\n", bytes
);
3804 for (i
= 0; i
< words
; i
++)
3805 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3807 ap
->hsm_task_state
= HSM_ST_LAST
;
3811 sg
= &qc
->__sg
[qc
->cursg
];
3814 offset
= sg
->offset
+ qc
->cursg_ofs
;
3816 /* get the current page and offset */
3817 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3818 offset
%= PAGE_SIZE
;
3820 /* don't overrun current sg */
3821 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3823 /* don't cross page boundaries */
3824 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3826 buf
= kmap(page
) + offset
;
3829 qc
->curbytes
+= count
;
3830 qc
->cursg_ofs
+= count
;
3832 if (qc
->cursg_ofs
== sg
->length
) {
3837 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3839 /* do the actual data transfer */
3840 ata_data_xfer(ap
, buf
, count
, do_write
);
3849 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3850 * @qc: Command on going
3852 * Transfer Transfer data from/to the ATAPI device.
3855 * Inherited from caller.
3858 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3860 struct ata_port
*ap
= qc
->ap
;
3861 struct ata_device
*dev
= qc
->dev
;
3862 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3863 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3865 ap
->ops
->tf_read(ap
, &qc
->tf
);
3866 ireason
= qc
->tf
.nsect
;
3867 bc_lo
= qc
->tf
.lbam
;
3868 bc_hi
= qc
->tf
.lbah
;
3869 bytes
= (bc_hi
<< 8) | bc_lo
;
3871 /* shall be cleared to zero, indicating xfer of data */
3872 if (ireason
& (1 << 0))
3875 /* make sure transfer direction matches expected */
3876 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3877 if (do_write
!= i_write
)
3880 __atapi_pio_bytes(qc
, bytes
);
3885 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3886 qc
->err_mask
|= AC_ERR_HSM
;
3887 ap
->hsm_task_state
= HSM_ST_ERR
;
3891 * ata_pio_block - start PIO on a block
3892 * @qc: qc to transfer block for
3895 * None. (executing in kernel thread context)
3897 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3899 struct ata_port
*ap
= qc
->ap
;
3903 * This is purely heuristic. This is a fast path.
3904 * Sometimes when we enter, BSY will be cleared in
3905 * a chk-status or two. If not, the drive is probably seeking
3906 * or something. Snooze for a couple msecs, then
3907 * chk-status again. If still busy, fall back to
3908 * HSM_ST_POLL state.
3910 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3911 if (status
& ATA_BUSY
) {
3913 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3914 if (status
& ATA_BUSY
) {
3915 ap
->hsm_task_state
= HSM_ST_POLL
;
3916 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3922 if (status
& (ATA_ERR
| ATA_DF
)) {
3923 qc
->err_mask
|= AC_ERR_DEV
;
3924 ap
->hsm_task_state
= HSM_ST_ERR
;
3928 /* transfer data if any */
3929 if (is_atapi_taskfile(&qc
->tf
)) {
3930 /* DRQ=0 means no more data to transfer */
3931 if ((status
& ATA_DRQ
) == 0) {
3932 ap
->hsm_task_state
= HSM_ST_LAST
;
3936 atapi_pio_bytes(qc
);
3938 /* handle BSY=0, DRQ=0 as error */
3939 if ((status
& ATA_DRQ
) == 0) {
3940 qc
->err_mask
|= AC_ERR_HSM
;
3941 ap
->hsm_task_state
= HSM_ST_ERR
;
3949 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3951 struct ata_port
*ap
= qc
->ap
;
3953 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3954 ata_dev_printk(qc
->dev
, KERN_WARNING
, "PIO error\n");
3956 /* make sure qc->err_mask is available to
3957 * know what's wrong and recover
3959 WARN_ON(qc
->err_mask
== 0);
3961 ap
->hsm_task_state
= HSM_ST_IDLE
;
3963 ata_poll_qc_complete(qc
);
3966 static void ata_pio_task(void *_data
)
3968 struct ata_queued_cmd
*qc
= _data
;
3969 struct ata_port
*ap
= qc
->ap
;
3970 unsigned long timeout
;
3977 switch (ap
->hsm_task_state
) {
3986 qc_completed
= ata_pio_complete(qc
);
3990 case HSM_ST_LAST_POLL
:
3991 timeout
= ata_pio_poll(qc
);
4001 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
4002 else if (!qc_completed
)
4007 * atapi_packet_task - Write CDB bytes to hardware
4008 * @_data: qc in progress
4010 * When device has indicated its readiness to accept
4011 * a CDB, this function is called. Send the CDB.
4012 * If DMA is to be performed, exit immediately.
4013 * Otherwise, we are in polling mode, so poll
4014 * status under operation succeeds or fails.
4017 * Kernel thread context (may sleep)
4019 static void atapi_packet_task(void *_data
)
4021 struct ata_queued_cmd
*qc
= _data
;
4022 struct ata_port
*ap
= qc
->ap
;
4025 /* sleep-wait for BSY to clear */
4026 DPRINTK("busy wait\n");
4027 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4028 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4032 /* make sure DRQ is set */
4033 status
= ata_chk_status(ap
);
4034 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4035 qc
->err_mask
|= AC_ERR_HSM
;
4040 DPRINTK("send cdb\n");
4041 WARN_ON(qc
->dev
->cdb_len
< 12);
4043 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4044 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4045 unsigned long flags
;
4047 /* Once we're done issuing command and kicking bmdma,
4048 * irq handler takes over. To not lose irq, we need
4049 * to clear NOINTR flag before sending cdb, but
4050 * interrupt handler shouldn't be invoked before we're
4051 * finished. Hence, the following locking.
4053 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4054 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4055 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4056 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4057 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4058 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4060 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4062 /* PIO commands are handled by polling */
4063 ap
->hsm_task_state
= HSM_ST
;
4064 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4070 ata_poll_qc_complete(qc
);
4074 * ata_qc_new - Request an available ATA command, for queueing
4075 * @ap: Port associated with device @dev
4076 * @dev: Device from whom we request an available command structure
4082 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4084 struct ata_queued_cmd
*qc
= NULL
;
4087 /* no command while frozen */
4088 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4091 /* the last tag is reserved for internal command. */
4092 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4093 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4094 qc
= __ata_qc_from_tag(ap
, i
);
4105 * ata_qc_new_init - Request an available ATA command, and initialize it
4106 * @dev: Device from whom we request an available command structure
4112 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4114 struct ata_port
*ap
= dev
->ap
;
4115 struct ata_queued_cmd
*qc
;
4117 qc
= ata_qc_new(ap
);
4130 * ata_qc_free - free unused ata_queued_cmd
4131 * @qc: Command to complete
4133 * Designed to free unused ata_queued_cmd object
4134 * in case something prevents using it.
4137 * spin_lock_irqsave(host_set lock)
4139 void ata_qc_free(struct ata_queued_cmd
*qc
)
4141 struct ata_port
*ap
= qc
->ap
;
4144 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4148 if (likely(ata_tag_valid(tag
))) {
4149 qc
->tag
= ATA_TAG_POISON
;
4150 clear_bit(tag
, &ap
->qactive
);
4154 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4156 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4157 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4159 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4162 /* command should be marked inactive atomically with qc completion */
4163 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4165 /* atapi: mark qc as inactive to prevent the interrupt handler
4166 * from completing the command twice later, before the error handler
4167 * is called. (when rc != 0 and atapi request sense is needed)
4169 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4171 /* call completion callback */
4172 qc
->complete_fn(qc
);
4176 * ata_qc_complete - Complete an active ATA command
4177 * @qc: Command to complete
4178 * @err_mask: ATA Status register contents
4180 * Indicate to the mid and upper layers that an ATA
4181 * command has completed, with either an ok or not-ok status.
4184 * spin_lock_irqsave(host_set lock)
4186 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4188 struct ata_port
*ap
= qc
->ap
;
4190 /* XXX: New EH and old EH use different mechanisms to
4191 * synchronize EH with regular execution path.
4193 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4194 * Normal execution path is responsible for not accessing a
4195 * failed qc. libata core enforces the rule by returning NULL
4196 * from ata_qc_from_tag() for failed qcs.
4198 * Old EH depends on ata_qc_complete() nullifying completion
4199 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4200 * not synchronize with interrupt handler. Only PIO task is
4203 if (ap
->ops
->error_handler
) {
4204 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4206 if (unlikely(qc
->err_mask
))
4207 qc
->flags
|= ATA_QCFLAG_FAILED
;
4209 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4210 if (!ata_tag_internal(qc
->tag
)) {
4211 /* always fill result TF for failed qc */
4212 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4213 ata_qc_schedule_eh(qc
);
4218 /* read result TF if requested */
4219 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4220 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4222 __ata_qc_complete(qc
);
4224 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4227 /* read result TF if failed or requested */
4228 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4229 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4231 __ata_qc_complete(qc
);
4235 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4237 struct ata_port
*ap
= qc
->ap
;
4239 switch (qc
->tf
.protocol
) {
4241 case ATA_PROT_ATAPI_DMA
:
4244 case ATA_PROT_ATAPI
:
4246 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4259 * ata_qc_issue - issue taskfile to device
4260 * @qc: command to issue to device
4262 * Prepare an ATA command to submission to device.
4263 * This includes mapping the data into a DMA-able
4264 * area, filling in the S/G table, and finally
4265 * writing the taskfile to hardware, starting the command.
4268 * spin_lock_irqsave(host_set lock)
4270 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4272 struct ata_port
*ap
= qc
->ap
;
4274 qc
->ap
->active_tag
= qc
->tag
;
4275 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4277 if (ata_should_dma_map(qc
)) {
4278 if (qc
->flags
& ATA_QCFLAG_SG
) {
4279 if (ata_sg_setup(qc
))
4281 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4282 if (ata_sg_setup_one(qc
))
4286 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4289 ap
->ops
->qc_prep(qc
);
4291 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4292 if (unlikely(qc
->err_mask
))
4297 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4298 qc
->err_mask
|= AC_ERR_SYSTEM
;
4300 ata_qc_complete(qc
);
4304 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4305 * @qc: command to issue to device
4307 * Using various libata functions and hooks, this function
4308 * starts an ATA command. ATA commands are grouped into
4309 * classes called "protocols", and issuing each type of protocol
4310 * is slightly different.
4312 * May be used as the qc_issue() entry in ata_port_operations.
4315 * spin_lock_irqsave(host_set lock)
4318 * Zero on success, AC_ERR_* mask on failure
4321 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4323 struct ata_port
*ap
= qc
->ap
;
4325 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4327 switch (qc
->tf
.protocol
) {
4328 case ATA_PROT_NODATA
:
4329 ata_tf_to_host(ap
, &qc
->tf
);
4333 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4334 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4335 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4338 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4339 ata_qc_set_polling(qc
);
4340 ata_tf_to_host(ap
, &qc
->tf
);
4341 ap
->hsm_task_state
= HSM_ST
;
4342 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4345 case ATA_PROT_ATAPI
:
4346 ata_qc_set_polling(qc
);
4347 ata_tf_to_host(ap
, &qc
->tf
);
4348 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4351 case ATA_PROT_ATAPI_NODATA
:
4352 ap
->flags
|= ATA_FLAG_NOINTR
;
4353 ata_tf_to_host(ap
, &qc
->tf
);
4354 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4357 case ATA_PROT_ATAPI_DMA
:
4358 ap
->flags
|= ATA_FLAG_NOINTR
;
4359 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4360 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4361 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4366 return AC_ERR_SYSTEM
;
4373 * ata_host_intr - Handle host interrupt for given (port, task)
4374 * @ap: Port on which interrupt arrived (possibly...)
4375 * @qc: Taskfile currently active in engine
4377 * Handle host interrupt for given queued command. Currently,
4378 * only DMA interrupts are handled. All other commands are
4379 * handled via polling with interrupts disabled (nIEN bit).
4382 * spin_lock_irqsave(host_set lock)
4385 * One if interrupt was handled, zero if not (shared irq).
4388 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4389 struct ata_queued_cmd
*qc
)
4391 u8 status
, host_stat
;
4393 switch (qc
->tf
.protocol
) {
4396 case ATA_PROT_ATAPI_DMA
:
4397 case ATA_PROT_ATAPI
:
4398 /* check status of DMA engine */
4399 host_stat
= ap
->ops
->bmdma_status(ap
);
4400 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4402 /* if it's not our irq... */
4403 if (!(host_stat
& ATA_DMA_INTR
))
4406 /* before we do anything else, clear DMA-Start bit */
4407 ap
->ops
->bmdma_stop(qc
);
4411 case ATA_PROT_ATAPI_NODATA
:
4412 case ATA_PROT_NODATA
:
4413 /* check altstatus */
4414 status
= ata_altstatus(ap
);
4415 if (status
& ATA_BUSY
)
4418 /* check main status, clearing INTRQ */
4419 status
= ata_chk_status(ap
);
4420 if (unlikely(status
& ATA_BUSY
))
4422 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4423 ap
->id
, qc
->tf
.protocol
, status
);
4425 /* ack bmdma irq events */
4426 ap
->ops
->irq_clear(ap
);
4428 /* complete taskfile transaction */
4429 qc
->err_mask
|= ac_err_mask(status
);
4430 ata_qc_complete(qc
);
4437 return 1; /* irq handled */
4440 ap
->stats
.idle_irq
++;
4443 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4444 ata_irq_ack(ap
, 0); /* debug trap */
4445 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4449 return 0; /* irq not handled */
4453 * ata_interrupt - Default ATA host interrupt handler
4454 * @irq: irq line (unused)
4455 * @dev_instance: pointer to our ata_host_set information structure
4458 * Default interrupt handler for PCI IDE devices. Calls
4459 * ata_host_intr() for each port that is not disabled.
4462 * Obtains host_set lock during operation.
4465 * IRQ_NONE or IRQ_HANDLED.
4468 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4470 struct ata_host_set
*host_set
= dev_instance
;
4472 unsigned int handled
= 0;
4473 unsigned long flags
;
4475 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4476 spin_lock_irqsave(&host_set
->lock
, flags
);
4478 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4479 struct ata_port
*ap
;
4481 ap
= host_set
->ports
[i
];
4483 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4484 struct ata_queued_cmd
*qc
;
4486 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4487 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4488 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4489 handled
|= ata_host_intr(ap
, qc
);
4493 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4495 return IRQ_RETVAL(handled
);
4499 * sata_scr_valid - test whether SCRs are accessible
4500 * @ap: ATA port to test SCR accessibility for
4502 * Test whether SCRs are accessible for @ap.
4508 * 1 if SCRs are accessible, 0 otherwise.
4510 int sata_scr_valid(struct ata_port
*ap
)
4512 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4516 * sata_scr_read - read SCR register of the specified port
4517 * @ap: ATA port to read SCR for
4519 * @val: Place to store read value
4521 * Read SCR register @reg of @ap into *@val. This function is
4522 * guaranteed to succeed if the cable type of the port is SATA
4523 * and the port implements ->scr_read.
4529 * 0 on success, negative errno on failure.
4531 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4533 if (sata_scr_valid(ap
)) {
4534 *val
= ap
->ops
->scr_read(ap
, reg
);
4541 * sata_scr_write - write SCR register of the specified port
4542 * @ap: ATA port to write SCR for
4543 * @reg: SCR to write
4544 * @val: value to write
4546 * Write @val to SCR register @reg of @ap. This function is
4547 * guaranteed to succeed if the cable type of the port is SATA
4548 * and the port implements ->scr_read.
4554 * 0 on success, negative errno on failure.
4556 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4558 if (sata_scr_valid(ap
)) {
4559 ap
->ops
->scr_write(ap
, reg
, val
);
4566 * sata_scr_write_flush - write SCR register of the specified port and flush
4567 * @ap: ATA port to write SCR for
4568 * @reg: SCR to write
4569 * @val: value to write
4571 * This function is identical to sata_scr_write() except that this
4572 * function performs flush after writing to the register.
4578 * 0 on success, negative errno on failure.
4580 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4582 if (sata_scr_valid(ap
)) {
4583 ap
->ops
->scr_write(ap
, reg
, val
);
4584 ap
->ops
->scr_read(ap
, reg
);
4591 * ata_port_online - test whether the given port is online
4592 * @ap: ATA port to test
4594 * Test whether @ap is online. Note that this function returns 0
4595 * if online status of @ap cannot be obtained, so
4596 * ata_port_online(ap) != !ata_port_offline(ap).
4602 * 1 if the port online status is available and online.
4604 int ata_port_online(struct ata_port
*ap
)
4608 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4614 * ata_port_offline - test whether the given port is offline
4615 * @ap: ATA port to test
4617 * Test whether @ap is offline. Note that this function returns
4618 * 0 if offline status of @ap cannot be obtained, so
4619 * ata_port_online(ap) != !ata_port_offline(ap).
4625 * 1 if the port offline status is available and offline.
4627 int ata_port_offline(struct ata_port
*ap
)
4631 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4637 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4638 * without filling any other registers
4640 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4642 struct ata_taskfile tf
;
4645 ata_tf_init(dev
, &tf
);
4648 tf
.flags
|= ATA_TFLAG_DEVICE
;
4649 tf
.protocol
= ATA_PROT_NODATA
;
4651 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4653 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4659 static int ata_flush_cache(struct ata_device
*dev
)
4663 if (!ata_try_flush_cache(dev
))
4666 if (ata_id_has_flush_ext(dev
->id
))
4667 cmd
= ATA_CMD_FLUSH_EXT
;
4669 cmd
= ATA_CMD_FLUSH
;
4671 return ata_do_simple_cmd(dev
, cmd
);
4674 static int ata_standby_drive(struct ata_device
*dev
)
4676 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4679 static int ata_start_drive(struct ata_device
*dev
)
4681 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4685 * ata_device_resume - wakeup a previously suspended devices
4686 * @dev: the device to resume
4688 * Kick the drive back into action, by sending it an idle immediate
4689 * command and making sure its transfer mode matches between drive
4693 int ata_device_resume(struct ata_device
*dev
)
4695 struct ata_port
*ap
= dev
->ap
;
4697 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4698 struct ata_device
*failed_dev
;
4699 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4700 while (ata_set_mode(ap
, &failed_dev
))
4701 ata_dev_disable(failed_dev
);
4703 if (!ata_dev_enabled(dev
))
4705 if (dev
->class == ATA_DEV_ATA
)
4706 ata_start_drive(dev
);
4712 * ata_device_suspend - prepare a device for suspend
4713 * @dev: the device to suspend
4715 * Flush the cache on the drive, if appropriate, then issue a
4716 * standbynow command.
4718 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
4720 struct ata_port
*ap
= dev
->ap
;
4722 if (!ata_dev_enabled(dev
))
4724 if (dev
->class == ATA_DEV_ATA
)
4725 ata_flush_cache(dev
);
4727 if (state
.event
!= PM_EVENT_FREEZE
)
4728 ata_standby_drive(dev
);
4729 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4734 * ata_port_start - Set port up for dma.
4735 * @ap: Port to initialize
4737 * Called just after data structures for each port are
4738 * initialized. Allocates space for PRD table.
4740 * May be used as the port_start() entry in ata_port_operations.
4743 * Inherited from caller.
4746 int ata_port_start (struct ata_port
*ap
)
4748 struct device
*dev
= ap
->dev
;
4751 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4755 rc
= ata_pad_alloc(ap
, dev
);
4757 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4761 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4768 * ata_port_stop - Undo ata_port_start()
4769 * @ap: Port to shut down
4771 * Frees the PRD table.
4773 * May be used as the port_stop() entry in ata_port_operations.
4776 * Inherited from caller.
4779 void ata_port_stop (struct ata_port
*ap
)
4781 struct device
*dev
= ap
->dev
;
4783 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4784 ata_pad_free(ap
, dev
);
4787 void ata_host_stop (struct ata_host_set
*host_set
)
4789 if (host_set
->mmio_base
)
4790 iounmap(host_set
->mmio_base
);
4795 * ata_host_remove - Unregister SCSI host structure with upper layers
4796 * @ap: Port to unregister
4797 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4800 * Inherited from caller.
4803 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4805 struct Scsi_Host
*sh
= ap
->host
;
4810 scsi_remove_host(sh
);
4812 ap
->ops
->port_stop(ap
);
4816 * ata_host_init - Initialize an ata_port structure
4817 * @ap: Structure to initialize
4818 * @host: associated SCSI mid-layer structure
4819 * @host_set: Collection of hosts to which @ap belongs
4820 * @ent: Probe information provided by low-level driver
4821 * @port_no: Port number associated with this ata_port
4823 * Initialize a new ata_port structure, and its associated
4827 * Inherited from caller.
4830 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4831 struct ata_host_set
*host_set
,
4832 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4838 host
->max_channel
= 1;
4839 host
->unique_id
= ata_unique_id
++;
4840 host
->max_cmd_len
= 12;
4842 ap
->flags
= ATA_FLAG_DISABLED
;
4843 ap
->id
= host
->unique_id
;
4845 ap
->ctl
= ATA_DEVCTL_OBS
;
4846 ap
->host_set
= host_set
;
4848 ap
->port_no
= port_no
;
4850 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4851 ap
->pio_mask
= ent
->pio_mask
;
4852 ap
->mwdma_mask
= ent
->mwdma_mask
;
4853 ap
->udma_mask
= ent
->udma_mask
;
4854 ap
->flags
|= ent
->host_flags
;
4855 ap
->ops
= ent
->port_ops
;
4856 ap
->sata_spd_limit
= UINT_MAX
;
4857 ap
->active_tag
= ATA_TAG_POISON
;
4858 ap
->last_ctl
= 0xFF;
4860 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4861 INIT_LIST_HEAD(&ap
->eh_done_q
);
4863 /* set cable type */
4864 ap
->cbl
= ATA_CBL_NONE
;
4865 if (ap
->flags
& ATA_FLAG_SATA
)
4866 ap
->cbl
= ATA_CBL_SATA
;
4868 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4869 struct ata_device
*dev
= &ap
->device
[i
];
4872 dev
->pio_mask
= UINT_MAX
;
4873 dev
->mwdma_mask
= UINT_MAX
;
4874 dev
->udma_mask
= UINT_MAX
;
4878 ap
->stats
.unhandled_irq
= 1;
4879 ap
->stats
.idle_irq
= 1;
4882 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4886 * ata_host_add - Attach low-level ATA driver to system
4887 * @ent: Information provided by low-level driver
4888 * @host_set: Collections of ports to which we add
4889 * @port_no: Port number associated with this host
4891 * Attach low-level ATA driver to system.
4894 * PCI/etc. bus probe sem.
4897 * New ata_port on success, for NULL on error.
4900 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4901 struct ata_host_set
*host_set
,
4902 unsigned int port_no
)
4904 struct Scsi_Host
*host
;
4905 struct ata_port
*ap
;
4910 if (!ent
->port_ops
->probe_reset
&&
4911 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4912 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4917 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4921 host
->transportt
= &ata_scsi_transport_template
;
4923 ap
= ata_shost_to_port(host
);
4925 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4927 rc
= ap
->ops
->port_start(ap
);
4934 scsi_host_put(host
);
4939 * ata_device_add - Register hardware device with ATA and SCSI layers
4940 * @ent: Probe information describing hardware device to be registered
4942 * This function processes the information provided in the probe
4943 * information struct @ent, allocates the necessary ATA and SCSI
4944 * host information structures, initializes them, and registers
4945 * everything with requisite kernel subsystems.
4947 * This function requests irqs, probes the ATA bus, and probes
4951 * PCI/etc. bus probe sem.
4954 * Number of ports registered. Zero on error (no ports registered).
4957 int ata_device_add(const struct ata_probe_ent
*ent
)
4959 unsigned int count
= 0, i
;
4960 struct device
*dev
= ent
->dev
;
4961 struct ata_host_set
*host_set
;
4964 /* alloc a container for our list of ATA ports (buses) */
4965 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4966 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4969 spin_lock_init(&host_set
->lock
);
4971 host_set
->dev
= dev
;
4972 host_set
->n_ports
= ent
->n_ports
;
4973 host_set
->irq
= ent
->irq
;
4974 host_set
->mmio_base
= ent
->mmio_base
;
4975 host_set
->private_data
= ent
->private_data
;
4976 host_set
->ops
= ent
->port_ops
;
4977 host_set
->flags
= ent
->host_set_flags
;
4979 /* register each port bound to this device */
4980 for (i
= 0; i
< ent
->n_ports
; i
++) {
4981 struct ata_port
*ap
;
4982 unsigned long xfer_mode_mask
;
4984 ap
= ata_host_add(ent
, host_set
, i
);
4988 host_set
->ports
[i
] = ap
;
4989 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4990 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4991 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4993 /* print per-port info to dmesg */
4994 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
4995 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4996 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4997 ata_mode_string(xfer_mode_mask
),
4998 ap
->ioaddr
.cmd_addr
,
4999 ap
->ioaddr
.ctl_addr
,
5000 ap
->ioaddr
.bmdma_addr
,
5004 host_set
->ops
->irq_clear(ap
);
5005 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5012 /* obtain irq, that is shared between channels */
5013 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5014 DRV_NAME
, host_set
))
5017 /* perform each probe synchronously */
5018 DPRINTK("probe begin\n");
5019 for (i
= 0; i
< count
; i
++) {
5020 struct ata_port
*ap
;
5023 ap
= host_set
->ports
[i
];
5025 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5026 rc
= ata_bus_probe(ap
);
5027 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5030 /* FIXME: do something useful here?
5031 * Current libata behavior will
5032 * tear down everything when
5033 * the module is removed
5034 * or the h/w is unplugged.
5038 rc
= scsi_add_host(ap
->host
, dev
);
5040 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5041 /* FIXME: do something useful here */
5042 /* FIXME: handle unconditional calls to
5043 * scsi_scan_host and ata_host_remove, below,
5049 /* probes are done, now scan each port's disk(s) */
5050 DPRINTK("host probe begin\n");
5051 for (i
= 0; i
< count
; i
++) {
5052 struct ata_port
*ap
= host_set
->ports
[i
];
5054 ata_scsi_scan_host(ap
);
5057 dev_set_drvdata(dev
, host_set
);
5059 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5060 return ent
->n_ports
; /* success */
5063 for (i
= 0; i
< count
; i
++) {
5064 ata_host_remove(host_set
->ports
[i
], 1);
5065 scsi_host_put(host_set
->ports
[i
]->host
);
5069 VPRINTK("EXIT, returning 0\n");
5074 * ata_host_set_remove - PCI layer callback for device removal
5075 * @host_set: ATA host set that was removed
5077 * Unregister all objects associated with this host set. Free those
5081 * Inherited from calling layer (may sleep).
5084 void ata_host_set_remove(struct ata_host_set
*host_set
)
5086 struct ata_port
*ap
;
5089 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5090 ap
= host_set
->ports
[i
];
5091 scsi_remove_host(ap
->host
);
5094 free_irq(host_set
->irq
, host_set
);
5096 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5097 ap
= host_set
->ports
[i
];
5099 ata_scsi_release(ap
->host
);
5101 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5102 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5104 if (ioaddr
->cmd_addr
== 0x1f0)
5105 release_region(0x1f0, 8);
5106 else if (ioaddr
->cmd_addr
== 0x170)
5107 release_region(0x170, 8);
5110 scsi_host_put(ap
->host
);
5113 if (host_set
->ops
->host_stop
)
5114 host_set
->ops
->host_stop(host_set
);
5120 * ata_scsi_release - SCSI layer callback hook for host unload
5121 * @host: libata host to be unloaded
5123 * Performs all duties necessary to shut down a libata port...
5124 * Kill port kthread, disable port, and release resources.
5127 * Inherited from SCSI layer.
5133 int ata_scsi_release(struct Scsi_Host
*host
)
5135 struct ata_port
*ap
= ata_shost_to_port(host
);
5139 ap
->ops
->port_disable(ap
);
5140 ata_host_remove(ap
, 0);
5147 * ata_std_ports - initialize ioaddr with standard port offsets.
5148 * @ioaddr: IO address structure to be initialized
5150 * Utility function which initializes data_addr, error_addr,
5151 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5152 * device_addr, status_addr, and command_addr to standard offsets
5153 * relative to cmd_addr.
5155 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5158 void ata_std_ports(struct ata_ioports
*ioaddr
)
5160 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5161 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5162 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5163 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5164 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5165 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5166 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5167 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5168 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5169 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5175 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5177 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5179 pci_iounmap(pdev
, host_set
->mmio_base
);
5183 * ata_pci_remove_one - PCI layer callback for device removal
5184 * @pdev: PCI device that was removed
5186 * PCI layer indicates to libata via this hook that
5187 * hot-unplug or module unload event has occurred.
5188 * Handle this by unregistering all objects associated
5189 * with this PCI device. Free those objects. Then finally
5190 * release PCI resources and disable device.
5193 * Inherited from PCI layer (may sleep).
5196 void ata_pci_remove_one (struct pci_dev
*pdev
)
5198 struct device
*dev
= pci_dev_to_dev(pdev
);
5199 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5201 ata_host_set_remove(host_set
);
5202 pci_release_regions(pdev
);
5203 pci_disable_device(pdev
);
5204 dev_set_drvdata(dev
, NULL
);
5207 /* move to PCI subsystem */
5208 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5210 unsigned long tmp
= 0;
5212 switch (bits
->width
) {
5215 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5221 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5227 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5238 return (tmp
== bits
->val
) ? 1 : 0;
5241 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5243 pci_save_state(pdev
);
5244 pci_disable_device(pdev
);
5245 pci_set_power_state(pdev
, PCI_D3hot
);
5249 int ata_pci_device_resume(struct pci_dev
*pdev
)
5251 pci_set_power_state(pdev
, PCI_D0
);
5252 pci_restore_state(pdev
);
5253 pci_enable_device(pdev
);
5254 pci_set_master(pdev
);
5257 #endif /* CONFIG_PCI */
5260 static int __init
ata_init(void)
5262 ata_wq
= create_workqueue("ata");
5266 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5270 static void __exit
ata_exit(void)
5272 destroy_workqueue(ata_wq
);
5275 module_init(ata_init
);
5276 module_exit(ata_exit
);
5278 static unsigned long ratelimit_time
;
5279 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5281 int ata_ratelimit(void)
5284 unsigned long flags
;
5286 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5288 if (time_after(jiffies
, ratelimit_time
)) {
5290 ratelimit_time
= jiffies
+ (HZ
/5);
5294 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5300 * ata_wait_register - wait until register value changes
5301 * @reg: IO-mapped register
5302 * @mask: Mask to apply to read register value
5303 * @val: Wait condition
5304 * @interval_msec: polling interval in milliseconds
5305 * @timeout_msec: timeout in milliseconds
5307 * Waiting for some bits of register to change is a common
5308 * operation for ATA controllers. This function reads 32bit LE
5309 * IO-mapped register @reg and tests for the following condition.
5311 * (*@reg & mask) != val
5313 * If the condition is met, it returns; otherwise, the process is
5314 * repeated after @interval_msec until timeout.
5317 * Kernel thread context (may sleep)
5320 * The final register value.
5322 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5323 unsigned long interval_msec
,
5324 unsigned long timeout_msec
)
5326 unsigned long timeout
;
5329 tmp
= ioread32(reg
);
5331 /* Calculate timeout _after_ the first read to make sure
5332 * preceding writes reach the controller before starting to
5333 * eat away the timeout.
5335 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5337 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5338 msleep(interval_msec
);
5339 tmp
= ioread32(reg
);
5346 * libata is essentially a library of internal helper functions for
5347 * low-level ATA host controller drivers. As such, the API/ABI is
5348 * likely to change as new drivers are added and updated.
5349 * Do not depend on ABI/API stability.
5352 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5353 EXPORT_SYMBOL_GPL(ata_std_ports
);
5354 EXPORT_SYMBOL_GPL(ata_device_add
);
5355 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5356 EXPORT_SYMBOL_GPL(ata_sg_init
);
5357 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5358 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5359 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5360 EXPORT_SYMBOL_GPL(ata_tf_load
);
5361 EXPORT_SYMBOL_GPL(ata_tf_read
);
5362 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5363 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5364 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5365 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5366 EXPORT_SYMBOL_GPL(ata_check_status
);
5367 EXPORT_SYMBOL_GPL(ata_altstatus
);
5368 EXPORT_SYMBOL_GPL(ata_exec_command
);
5369 EXPORT_SYMBOL_GPL(ata_port_start
);
5370 EXPORT_SYMBOL_GPL(ata_port_stop
);
5371 EXPORT_SYMBOL_GPL(ata_host_stop
);
5372 EXPORT_SYMBOL_GPL(ata_interrupt
);
5373 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5374 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5375 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5376 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5377 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5378 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5379 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5380 EXPORT_SYMBOL_GPL(ata_port_probe
);
5381 EXPORT_SYMBOL_GPL(sata_set_spd
);
5382 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5383 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5384 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5385 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5386 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5387 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5388 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5389 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5390 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5391 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5392 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5393 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5394 EXPORT_SYMBOL_GPL(ata_port_disable
);
5395 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5396 EXPORT_SYMBOL_GPL(ata_wait_register
);
5397 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5398 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5399 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5400 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5401 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5402 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5403 EXPORT_SYMBOL_GPL(ata_host_intr
);
5404 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5405 EXPORT_SYMBOL_GPL(sata_scr_read
);
5406 EXPORT_SYMBOL_GPL(sata_scr_write
);
5407 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5408 EXPORT_SYMBOL_GPL(ata_port_online
);
5409 EXPORT_SYMBOL_GPL(ata_port_offline
);
5410 EXPORT_SYMBOL_GPL(ata_id_string
);
5411 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5412 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5414 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5415 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5416 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5419 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5420 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5421 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5422 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5423 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5424 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5425 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5426 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5427 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5428 #endif /* CONFIG_PCI */
5430 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5431 EXPORT_SYMBOL_GPL(ata_device_resume
);
5432 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5433 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5435 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5436 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5437 EXPORT_SYMBOL_GPL(ata_port_abort
);
5438 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5439 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5440 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5441 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5442 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);