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_busy_sleep (struct ata_port
*ap
,
65 unsigned long tmout_pat
,
67 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
);
68 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
);
69 static void ata_set_mode(struct ata_port
*ap
);
70 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
71 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
72 static int fgb(u32 bitmap
);
73 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
75 unsigned int *xfer_shift_out
);
76 static void __ata_qc_complete(struct ata_queued_cmd
*qc
);
78 static unsigned int ata_unique_id
= 1;
79 static struct workqueue_struct
*ata_wq
;
81 int atapi_enabled
= 0;
82 module_param(atapi_enabled
, int, 0444);
83 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
85 MODULE_AUTHOR("Jeff Garzik");
86 MODULE_DESCRIPTION("Library module for ATA devices");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_load_pio - send taskfile registers to host controller
92 * @ap: Port to which output is sent
93 * @tf: ATA taskfile register set
95 * Outputs ATA taskfile to standard ATA host controller.
98 * Inherited from caller.
101 static void ata_tf_load_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
103 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
104 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
106 if (tf
->ctl
!= ap
->last_ctl
) {
107 outb(tf
->ctl
, ioaddr
->ctl_addr
);
108 ap
->last_ctl
= tf
->ctl
;
112 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
113 outb(tf
->hob_feature
, ioaddr
->feature_addr
);
114 outb(tf
->hob_nsect
, ioaddr
->nsect_addr
);
115 outb(tf
->hob_lbal
, ioaddr
->lbal_addr
);
116 outb(tf
->hob_lbam
, ioaddr
->lbam_addr
);
117 outb(tf
->hob_lbah
, ioaddr
->lbah_addr
);
118 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
127 outb(tf
->feature
, ioaddr
->feature_addr
);
128 outb(tf
->nsect
, ioaddr
->nsect_addr
);
129 outb(tf
->lbal
, ioaddr
->lbal_addr
);
130 outb(tf
->lbam
, ioaddr
->lbam_addr
);
131 outb(tf
->lbah
, ioaddr
->lbah_addr
);
132 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
140 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
141 outb(tf
->device
, ioaddr
->device_addr
);
142 VPRINTK("device 0x%X\n", tf
->device
);
149 * ata_tf_load_mmio - send taskfile registers to host controller
150 * @ap: Port to which output is sent
151 * @tf: ATA taskfile register set
153 * Outputs ATA taskfile to standard ATA host controller using MMIO.
156 * Inherited from caller.
159 static void ata_tf_load_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
161 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
162 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
164 if (tf
->ctl
!= ap
->last_ctl
) {
165 writeb(tf
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
166 ap
->last_ctl
= tf
->ctl
;
170 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
171 writeb(tf
->hob_feature
, (void __iomem
*) ioaddr
->feature_addr
);
172 writeb(tf
->hob_nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
173 writeb(tf
->hob_lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
174 writeb(tf
->hob_lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
175 writeb(tf
->hob_lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
176 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
185 writeb(tf
->feature
, (void __iomem
*) ioaddr
->feature_addr
);
186 writeb(tf
->nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
187 writeb(tf
->lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
188 writeb(tf
->lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
189 writeb(tf
->lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
190 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
198 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
199 writeb(tf
->device
, (void __iomem
*) ioaddr
->device_addr
);
200 VPRINTK("device 0x%X\n", tf
->device
);
208 * ata_tf_load - send taskfile registers to host controller
209 * @ap: Port to which output is sent
210 * @tf: ATA taskfile register set
212 * Outputs ATA taskfile to standard ATA host controller using MMIO
213 * or PIO as indicated by the ATA_FLAG_MMIO flag.
214 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
215 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
216 * hob_lbal, hob_lbam, and hob_lbah.
218 * This function waits for idle (!BUSY and !DRQ) after writing
219 * registers. If the control register has a new value, this
220 * function also waits for idle after writing control and before
221 * writing the remaining registers.
223 * May be used as the tf_load() entry in ata_port_operations.
226 * Inherited from caller.
228 void ata_tf_load(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
230 if (ap
->flags
& ATA_FLAG_MMIO
)
231 ata_tf_load_mmio(ap
, tf
);
233 ata_tf_load_pio(ap
, tf
);
237 * ata_exec_command_pio - issue ATA command to host controller
238 * @ap: port to which command is being issued
239 * @tf: ATA taskfile register set
241 * Issues PIO write to ATA command register, with proper
242 * synchronization with interrupt handler / other threads.
245 * spin_lock_irqsave(host_set lock)
248 static void ata_exec_command_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
250 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
252 outb(tf
->command
, ap
->ioaddr
.command_addr
);
258 * ata_exec_command_mmio - issue ATA command to host controller
259 * @ap: port to which command is being issued
260 * @tf: ATA taskfile register set
262 * Issues MMIO write to ATA command register, with proper
263 * synchronization with interrupt handler / other threads.
266 * spin_lock_irqsave(host_set lock)
269 static void ata_exec_command_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
271 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
273 writeb(tf
->command
, (void __iomem
*) ap
->ioaddr
.command_addr
);
279 * ata_exec_command - issue ATA command to host controller
280 * @ap: port to which command is being issued
281 * @tf: ATA taskfile register set
283 * Issues PIO/MMIO write to ATA command register, with proper
284 * synchronization with interrupt handler / other threads.
287 * spin_lock_irqsave(host_set lock)
289 void ata_exec_command(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
291 if (ap
->flags
& ATA_FLAG_MMIO
)
292 ata_exec_command_mmio(ap
, tf
);
294 ata_exec_command_pio(ap
, tf
);
298 * ata_tf_to_host - issue ATA taskfile to host controller
299 * @ap: port to which command is being issued
300 * @tf: ATA taskfile register set
302 * Issues ATA taskfile register set to ATA host controller,
303 * with proper synchronization with interrupt handler and
307 * spin_lock_irqsave(host_set lock)
310 static inline void ata_tf_to_host(struct ata_port
*ap
,
311 const struct ata_taskfile
*tf
)
313 ap
->ops
->tf_load(ap
, tf
);
314 ap
->ops
->exec_command(ap
, tf
);
318 * ata_tf_read_pio - input device's ATA taskfile shadow registers
319 * @ap: Port from which input is read
320 * @tf: ATA taskfile register set for storing input
322 * Reads ATA taskfile registers for currently-selected device
326 * Inherited from caller.
329 static void ata_tf_read_pio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
331 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
333 tf
->command
= ata_check_status(ap
);
334 tf
->feature
= inb(ioaddr
->error_addr
);
335 tf
->nsect
= inb(ioaddr
->nsect_addr
);
336 tf
->lbal
= inb(ioaddr
->lbal_addr
);
337 tf
->lbam
= inb(ioaddr
->lbam_addr
);
338 tf
->lbah
= inb(ioaddr
->lbah_addr
);
339 tf
->device
= inb(ioaddr
->device_addr
);
341 if (tf
->flags
& ATA_TFLAG_LBA48
) {
342 outb(tf
->ctl
| ATA_HOB
, ioaddr
->ctl_addr
);
343 tf
->hob_feature
= inb(ioaddr
->error_addr
);
344 tf
->hob_nsect
= inb(ioaddr
->nsect_addr
);
345 tf
->hob_lbal
= inb(ioaddr
->lbal_addr
);
346 tf
->hob_lbam
= inb(ioaddr
->lbam_addr
);
347 tf
->hob_lbah
= inb(ioaddr
->lbah_addr
);
352 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
353 * @ap: Port from which input is read
354 * @tf: ATA taskfile register set for storing input
356 * Reads ATA taskfile registers for currently-selected device
360 * Inherited from caller.
363 static void ata_tf_read_mmio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
365 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
367 tf
->command
= ata_check_status(ap
);
368 tf
->feature
= readb((void __iomem
*)ioaddr
->error_addr
);
369 tf
->nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
370 tf
->lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
371 tf
->lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
372 tf
->lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
373 tf
->device
= readb((void __iomem
*)ioaddr
->device_addr
);
375 if (tf
->flags
& ATA_TFLAG_LBA48
) {
376 writeb(tf
->ctl
| ATA_HOB
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
377 tf
->hob_feature
= readb((void __iomem
*)ioaddr
->error_addr
);
378 tf
->hob_nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
379 tf
->hob_lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
380 tf
->hob_lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
381 tf
->hob_lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
387 * ata_tf_read - input device's ATA taskfile shadow registers
388 * @ap: Port from which input is read
389 * @tf: ATA taskfile register set for storing input
391 * Reads ATA taskfile registers for currently-selected device
394 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
395 * is set, also reads the hob registers.
397 * May be used as the tf_read() entry in ata_port_operations.
400 * Inherited from caller.
402 void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
404 if (ap
->flags
& ATA_FLAG_MMIO
)
405 ata_tf_read_mmio(ap
, tf
);
407 ata_tf_read_pio(ap
, tf
);
411 * ata_check_status_pio - Read device status reg & clear interrupt
412 * @ap: port where the device is
414 * Reads ATA taskfile status register for currently-selected device
415 * and return its value. This also clears pending interrupts
419 * Inherited from caller.
421 static u8
ata_check_status_pio(struct ata_port
*ap
)
423 return inb(ap
->ioaddr
.status_addr
);
427 * ata_check_status_mmio - Read device status reg & clear interrupt
428 * @ap: port where the device is
430 * Reads ATA taskfile status register for currently-selected device
431 * via MMIO and return its value. This also clears pending interrupts
435 * Inherited from caller.
437 static u8
ata_check_status_mmio(struct ata_port
*ap
)
439 return readb((void __iomem
*) ap
->ioaddr
.status_addr
);
444 * ata_check_status - Read device status reg & clear interrupt
445 * @ap: port where the device is
447 * Reads ATA taskfile status register for currently-selected device
448 * and return its value. This also clears pending interrupts
451 * May be used as the check_status() entry in ata_port_operations.
454 * Inherited from caller.
456 u8
ata_check_status(struct ata_port
*ap
)
458 if (ap
->flags
& ATA_FLAG_MMIO
)
459 return ata_check_status_mmio(ap
);
460 return ata_check_status_pio(ap
);
465 * ata_altstatus - Read device alternate status reg
466 * @ap: port where the device is
468 * Reads ATA taskfile alternate status register for
469 * currently-selected device and return its value.
471 * Note: may NOT be used as the check_altstatus() entry in
472 * ata_port_operations.
475 * Inherited from caller.
477 u8
ata_altstatus(struct ata_port
*ap
)
479 if (ap
->ops
->check_altstatus
)
480 return ap
->ops
->check_altstatus(ap
);
482 if (ap
->flags
& ATA_FLAG_MMIO
)
483 return readb((void __iomem
*)ap
->ioaddr
.altstatus_addr
);
484 return inb(ap
->ioaddr
.altstatus_addr
);
489 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
490 * @tf: Taskfile to convert
491 * @fis: Buffer into which data will output
492 * @pmp: Port multiplier port
494 * Converts a standard ATA taskfile to a Serial ATA
495 * FIS structure (Register - Host to Device).
498 * Inherited from caller.
501 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
503 fis
[0] = 0x27; /* Register - Host to Device FIS */
504 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
505 bit 7 indicates Command FIS */
506 fis
[2] = tf
->command
;
507 fis
[3] = tf
->feature
;
514 fis
[8] = tf
->hob_lbal
;
515 fis
[9] = tf
->hob_lbam
;
516 fis
[10] = tf
->hob_lbah
;
517 fis
[11] = tf
->hob_feature
;
520 fis
[13] = tf
->hob_nsect
;
531 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
532 * @fis: Buffer from which data will be input
533 * @tf: Taskfile to output
535 * Converts a serial ATA FIS structure to a standard ATA taskfile.
538 * Inherited from caller.
541 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
543 tf
->command
= fis
[2]; /* status */
544 tf
->feature
= fis
[3]; /* error */
551 tf
->hob_lbal
= fis
[8];
552 tf
->hob_lbam
= fis
[9];
553 tf
->hob_lbah
= fis
[10];
556 tf
->hob_nsect
= fis
[13];
559 static const u8 ata_rw_cmds
[] = {
563 ATA_CMD_READ_MULTI_EXT
,
564 ATA_CMD_WRITE_MULTI_EXT
,
568 ATA_CMD_PIO_READ_EXT
,
569 ATA_CMD_PIO_WRITE_EXT
,
578 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
579 * @qc: command to examine and configure
581 * Examine the device configuration and tf->flags to calculate
582 * the proper read/write commands and protocol to use.
587 void ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
589 struct ata_taskfile
*tf
= &qc
->tf
;
590 struct ata_device
*dev
= qc
->dev
;
592 int index
, lba48
, write
;
594 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
595 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
597 if (dev
->flags
& ATA_DFLAG_PIO
) {
598 tf
->protocol
= ATA_PROT_PIO
;
599 index
= dev
->multi_count
? 0 : 4;
601 tf
->protocol
= ATA_PROT_DMA
;
605 tf
->command
= ata_rw_cmds
[index
+ lba48
+ write
];
608 static const char * const xfer_mode_str
[] = {
628 * ata_udma_string - convert UDMA bit offset to string
629 * @mask: mask of bits supported; only highest bit counts.
631 * Determine string which represents the highest speed
632 * (highest bit in @udma_mask).
638 * Constant C string representing highest speed listed in
639 * @udma_mask, or the constant C string "<n/a>".
642 static const char *ata_mode_string(unsigned int mask
)
646 for (i
= 7; i
>= 0; i
--)
649 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
652 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
659 return xfer_mode_str
[i
];
663 * ata_pio_devchk - PATA device presence detection
664 * @ap: ATA channel to examine
665 * @device: Device to examine (starting at zero)
667 * This technique was originally described in
668 * Hale Landis's ATADRVR (www.ata-atapi.com), and
669 * later found its way into the ATA/ATAPI spec.
671 * Write a pattern to the ATA shadow registers,
672 * and if a device is present, it will respond by
673 * correctly storing and echoing back the
674 * ATA shadow register contents.
680 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
683 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
686 ap
->ops
->dev_select(ap
, device
);
688 outb(0x55, ioaddr
->nsect_addr
);
689 outb(0xaa, ioaddr
->lbal_addr
);
691 outb(0xaa, ioaddr
->nsect_addr
);
692 outb(0x55, ioaddr
->lbal_addr
);
694 outb(0x55, ioaddr
->nsect_addr
);
695 outb(0xaa, ioaddr
->lbal_addr
);
697 nsect
= inb(ioaddr
->nsect_addr
);
698 lbal
= inb(ioaddr
->lbal_addr
);
700 if ((nsect
== 0x55) && (lbal
== 0xaa))
701 return 1; /* we found a device */
703 return 0; /* nothing found */
707 * ata_mmio_devchk - PATA device presence detection
708 * @ap: ATA channel to examine
709 * @device: Device to examine (starting at zero)
711 * This technique was originally described in
712 * Hale Landis's ATADRVR (www.ata-atapi.com), and
713 * later found its way into the ATA/ATAPI spec.
715 * Write a pattern to the ATA shadow registers,
716 * and if a device is present, it will respond by
717 * correctly storing and echoing back the
718 * ATA shadow register contents.
724 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
727 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
730 ap
->ops
->dev_select(ap
, device
);
732 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
733 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
735 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
736 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
738 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
739 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
741 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
742 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
744 if ((nsect
== 0x55) && (lbal
== 0xaa))
745 return 1; /* we found a device */
747 return 0; /* nothing found */
751 * ata_devchk - PATA device presence detection
752 * @ap: ATA channel to examine
753 * @device: Device to examine (starting at zero)
755 * Dispatch ATA device presence detection, depending
756 * on whether we are using PIO or MMIO to talk to the
757 * ATA shadow registers.
763 static unsigned int ata_devchk(struct ata_port
*ap
,
766 if (ap
->flags
& ATA_FLAG_MMIO
)
767 return ata_mmio_devchk(ap
, device
);
768 return ata_pio_devchk(ap
, device
);
772 * ata_dev_classify - determine device type based on ATA-spec signature
773 * @tf: ATA taskfile register set for device to be identified
775 * Determine from taskfile register contents whether a device is
776 * ATA or ATAPI, as per "Signature and persistence" section
777 * of ATA/PI spec (volume 1, sect 5.14).
783 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
784 * the event of failure.
787 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
789 /* Apple's open source Darwin code hints that some devices only
790 * put a proper signature into the LBA mid/high registers,
791 * So, we only check those. It's sufficient for uniqueness.
794 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
795 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
796 DPRINTK("found ATA device by sig\n");
800 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
801 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
802 DPRINTK("found ATAPI device by sig\n");
803 return ATA_DEV_ATAPI
;
806 DPRINTK("unknown device\n");
807 return ATA_DEV_UNKNOWN
;
811 * ata_dev_try_classify - Parse returned ATA device signature
812 * @ap: ATA channel to examine
813 * @device: Device to examine (starting at zero)
815 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
816 * an ATA/ATAPI-defined set of values is placed in the ATA
817 * shadow registers, indicating the results of device detection
820 * Select the ATA device, and read the values from the ATA shadow
821 * registers. Then parse according to the Error register value,
822 * and the spec-defined values examined by ata_dev_classify().
828 static u8
ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
)
830 struct ata_device
*dev
= &ap
->device
[device
];
831 struct ata_taskfile tf
;
835 ap
->ops
->dev_select(ap
, device
);
837 memset(&tf
, 0, sizeof(tf
));
839 ap
->ops
->tf_read(ap
, &tf
);
842 dev
->class = ATA_DEV_NONE
;
844 /* see if device passed diags */
847 else if ((device
== 0) && (err
== 0x81))
852 /* determine if device if ATA or ATAPI */
853 class = ata_dev_classify(&tf
);
854 if (class == ATA_DEV_UNKNOWN
)
856 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
865 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
866 * @id: IDENTIFY DEVICE results we will examine
867 * @s: string into which data is output
868 * @ofs: offset into identify device page
869 * @len: length of string to return. must be an even number.
871 * The strings in the IDENTIFY DEVICE page are broken up into
872 * 16-bit chunks. Run through the string, and output each
873 * 8-bit chunk linearly, regardless of platform.
879 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
880 unsigned int ofs
, unsigned int len
)
900 * ata_noop_dev_select - Select device 0/1 on ATA bus
901 * @ap: ATA channel to manipulate
902 * @device: ATA device (numbered from zero) to select
904 * This function performs no actual function.
906 * May be used as the dev_select() entry in ata_port_operations.
911 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
917 * ata_std_dev_select - Select device 0/1 on ATA bus
918 * @ap: ATA channel to manipulate
919 * @device: ATA device (numbered from zero) to select
921 * Use the method defined in the ATA specification to
922 * make either device 0, or device 1, active on the
923 * ATA channel. Works with both PIO and MMIO.
925 * May be used as the dev_select() entry in ata_port_operations.
931 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
936 tmp
= ATA_DEVICE_OBS
;
938 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
940 if (ap
->flags
& ATA_FLAG_MMIO
) {
941 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
943 outb(tmp
, ap
->ioaddr
.device_addr
);
945 ata_pause(ap
); /* needed; also flushes, for mmio */
949 * ata_dev_select - Select device 0/1 on ATA bus
950 * @ap: ATA channel to manipulate
951 * @device: ATA device (numbered from zero) to select
952 * @wait: non-zero to wait for Status register BSY bit to clear
953 * @can_sleep: non-zero if context allows sleeping
955 * Use the method defined in the ATA specification to
956 * make either device 0, or device 1, active on the
959 * This is a high-level version of ata_std_dev_select(),
960 * which additionally provides the services of inserting
961 * the proper pauses and status polling, where needed.
967 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
968 unsigned int wait
, unsigned int can_sleep
)
970 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
971 ap
->id
, device
, wait
);
976 ap
->ops
->dev_select(ap
, device
);
979 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
986 * ata_dump_id - IDENTIFY DEVICE info debugging output
987 * @dev: Device whose IDENTIFY DEVICE page we will dump
989 * Dump selected 16-bit words from a detected device's
990 * IDENTIFY PAGE page.
996 static inline void ata_dump_id(const struct ata_device
*dev
)
998 DPRINTK("49==0x%04x "
1008 DPRINTK("80==0x%04x "
1018 DPRINTK("88==0x%04x "
1025 * Compute the PIO modes available for this device. This is not as
1026 * trivial as it seems if we must consider early devices correctly.
1028 * FIXME: pre IDE drive timing (do we care ?).
1031 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
1035 /* Usual case. Word 53 indicates word 88 is valid */
1036 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 2)) {
1037 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
1043 /* If word 88 isn't valid then Word 51 holds the PIO timing number
1044 for the maximum. Turn it into a mask and return it */
1045 modes
= (2 << (adev
->id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
1049 struct ata_exec_internal_arg
{
1050 unsigned int err_mask
;
1051 struct ata_taskfile
*tf
;
1052 struct completion
*waiting
;
1055 int ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
1057 struct ata_exec_internal_arg
*arg
= qc
->private_data
;
1058 struct completion
*waiting
= arg
->waiting
;
1060 if (!(qc
->err_mask
& ~AC_ERR_DEV
))
1061 qc
->ap
->ops
->tf_read(qc
->ap
, arg
->tf
);
1062 arg
->err_mask
= qc
->err_mask
;
1063 arg
->waiting
= NULL
;
1070 * ata_exec_internal - execute libata internal command
1071 * @ap: Port to which the command is sent
1072 * @dev: Device to which the command is sent
1073 * @tf: Taskfile registers for the command and the result
1074 * @dma_dir: Data tranfer direction of the command
1075 * @buf: Data buffer of the command
1076 * @buflen: Length of data buffer
1078 * Executes libata internal command with timeout. @tf contains
1079 * command on entry and result on return. Timeout and error
1080 * conditions are reported via return value. No recovery action
1081 * is taken after a command times out. It's caller's duty to
1082 * clean up after timeout.
1085 * None. Should be called with kernel context, might sleep.
1089 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
1090 struct ata_taskfile
*tf
,
1091 int dma_dir
, void *buf
, unsigned int buflen
)
1093 u8 command
= tf
->command
;
1094 struct ata_queued_cmd
*qc
;
1095 DECLARE_COMPLETION(wait
);
1096 unsigned long flags
;
1097 struct ata_exec_internal_arg arg
;
1099 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1101 qc
= ata_qc_new_init(ap
, dev
);
1105 qc
->dma_dir
= dma_dir
;
1106 if (dma_dir
!= DMA_NONE
) {
1107 ata_sg_init_one(qc
, buf
, buflen
);
1108 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1111 arg
.waiting
= &wait
;
1113 qc
->private_data
= &arg
;
1114 qc
->complete_fn
= ata_qc_complete_internal
;
1116 if (ata_qc_issue(qc
))
1119 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1121 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1122 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1124 /* We're racing with irq here. If we lose, the
1125 * following test prevents us from completing the qc
1126 * again. If completion irq occurs after here but
1127 * before the caller cleans up, it will result in a
1128 * spurious interrupt. We can live with that.
1131 qc
->err_mask
= AC_ERR_OTHER
;
1132 ata_qc_complete(qc
);
1133 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1137 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1140 return arg
.err_mask
;
1144 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1145 return AC_ERR_OTHER
;
1149 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1150 * @ap: port on which device we wish to probe resides
1151 * @device: device bus address, starting at zero
1153 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1154 * command, and read back the 512-byte device information page.
1155 * The device information page is fed to us via the standard
1156 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1157 * using standard PIO-IN paths)
1159 * After reading the device information page, we use several
1160 * bits of information from it to initialize data structures
1161 * that will be used during the lifetime of the ata_device.
1162 * Other data from the info page is used to disqualify certain
1163 * older ATA devices we do not wish to support.
1166 * Inherited from caller. Some functions called by this function
1167 * obtain the host_set lock.
1170 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1172 struct ata_device
*dev
= &ap
->device
[device
];
1173 unsigned int major_version
;
1175 unsigned long xfer_modes
;
1176 unsigned int using_edd
;
1177 struct ata_taskfile tf
;
1178 unsigned int err_mask
;
1181 if (!ata_dev_present(dev
)) {
1182 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1187 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1192 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1194 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1195 dev
->class == ATA_DEV_NONE
);
1197 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1200 ata_tf_init(ap
, &tf
, device
);
1202 if (dev
->class == ATA_DEV_ATA
) {
1203 tf
.command
= ATA_CMD_ID_ATA
;
1204 DPRINTK("do ATA identify\n");
1206 tf
.command
= ATA_CMD_ID_ATAPI
;
1207 DPRINTK("do ATAPI identify\n");
1210 tf
.protocol
= ATA_PROT_PIO
;
1212 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1213 dev
->id
, sizeof(dev
->id
));
1216 if (err_mask
& ~AC_ERR_DEV
)
1220 * arg! EDD works for all test cases, but seems to return
1221 * the ATA signature for some ATAPI devices. Until the
1222 * reason for this is found and fixed, we fix up the mess
1223 * here. If IDENTIFY DEVICE returns command aborted
1224 * (as ATAPI devices do), then we issue an
1225 * IDENTIFY PACKET DEVICE.
1227 * ATA software reset (SRST, the default) does not appear
1228 * to have this problem.
1230 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1231 u8 err
= tf
.feature
;
1232 if (err
& ATA_ABORTED
) {
1233 dev
->class = ATA_DEV_ATAPI
;
1240 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1242 /* print device capabilities */
1243 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1244 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1245 ap
->id
, device
, dev
->id
[49],
1246 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1247 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1251 * common ATA, ATAPI feature tests
1254 /* we require DMA support (bits 8 of word 49) */
1255 if (!ata_id_has_dma(dev
->id
)) {
1256 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1260 /* quick-n-dirty find max transfer mode; for printk only */
1261 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1263 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1265 xfer_modes
= ata_pio_modes(dev
);
1269 /* ATA-specific feature tests */
1270 if (dev
->class == ATA_DEV_ATA
) {
1271 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1274 /* get major version */
1275 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1276 for (major_version
= 14; major_version
>= 1; major_version
--)
1277 if (tmp
& (1 << major_version
))
1281 * The exact sequence expected by certain pre-ATA4 drives is:
1284 * INITIALIZE DEVICE PARAMETERS
1286 * Some drives were very specific about that exact sequence.
1288 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1289 ata_dev_init_params(ap
, dev
);
1291 /* current CHS translation info (id[53-58]) might be
1292 * changed. reread the identify device info.
1294 ata_dev_reread_id(ap
, dev
);
1297 if (ata_id_has_lba(dev
->id
)) {
1298 dev
->flags
|= ATA_DFLAG_LBA
;
1300 if (ata_id_has_lba48(dev
->id
)) {
1301 dev
->flags
|= ATA_DFLAG_LBA48
;
1302 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1304 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1307 /* print device info to dmesg */
1308 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1311 ata_mode_string(xfer_modes
),
1312 (unsigned long long)dev
->n_sectors
,
1313 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1317 /* Default translation */
1318 dev
->cylinders
= dev
->id
[1];
1319 dev
->heads
= dev
->id
[3];
1320 dev
->sectors
= dev
->id
[6];
1321 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1323 if (ata_id_current_chs_valid(dev
->id
)) {
1324 /* Current CHS translation is valid. */
1325 dev
->cylinders
= dev
->id
[54];
1326 dev
->heads
= dev
->id
[55];
1327 dev
->sectors
= dev
->id
[56];
1329 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1332 /* print device info to dmesg */
1333 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1336 ata_mode_string(xfer_modes
),
1337 (unsigned long long)dev
->n_sectors
,
1338 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1342 ap
->host
->max_cmd_len
= 16;
1345 /* ATAPI-specific feature tests */
1346 else if (dev
->class == ATA_DEV_ATAPI
) {
1347 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1350 rc
= atapi_cdb_len(dev
->id
);
1351 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1352 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1355 ap
->cdb_len
= (unsigned int) rc
;
1356 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1358 /* print device info to dmesg */
1359 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1361 ata_mode_string(xfer_modes
));
1364 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1368 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1371 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1372 DPRINTK("EXIT, err\n");
1376 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1378 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1382 * ata_dev_config - Run device specific handlers and check for
1383 * SATA->PATA bridges
1390 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1392 /* limit bridge transfers to udma5, 200 sectors */
1393 if (ata_dev_knobble(ap
)) {
1394 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1395 ap
->id
, ap
->device
->devno
);
1396 ap
->udma_mask
&= ATA_UDMA5
;
1397 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1398 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1399 ap
->device
->flags
|= ATA_DFLAG_LOCK_SECTORS
;
1402 if (ap
->ops
->dev_config
)
1403 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1407 * ata_bus_probe - Reset and probe ATA bus
1410 * Master ATA bus probing function. Initiates a hardware-dependent
1411 * bus reset, then attempts to identify any devices found on
1415 * PCI/etc. bus probe sem.
1418 * Zero on success, non-zero on error.
1421 static int ata_bus_probe(struct ata_port
*ap
)
1423 unsigned int i
, found
= 0;
1425 ap
->ops
->phy_reset(ap
);
1426 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1429 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1430 ata_dev_identify(ap
, i
);
1431 if (ata_dev_present(&ap
->device
[i
])) {
1433 ata_dev_config(ap
,i
);
1437 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1438 goto err_out_disable
;
1441 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1442 goto err_out_disable
;
1447 ap
->ops
->port_disable(ap
);
1453 * ata_port_probe - Mark port as enabled
1454 * @ap: Port for which we indicate enablement
1456 * Modify @ap data structure such that the system
1457 * thinks that the entire port is enabled.
1459 * LOCKING: host_set lock, or some other form of
1463 void ata_port_probe(struct ata_port
*ap
)
1465 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1469 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1470 * @ap: SATA port associated with target SATA PHY.
1472 * This function issues commands to standard SATA Sxxx
1473 * PHY registers, to wake up the phy (and device), and
1474 * clear any reset condition.
1477 * PCI/etc. bus probe sem.
1480 void __sata_phy_reset(struct ata_port
*ap
)
1483 unsigned long timeout
= jiffies
+ (HZ
* 5);
1485 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1486 /* issue phy wake/reset */
1487 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1488 /* Couldn't find anything in SATA I/II specs, but
1489 * AHCI-1.1 10.4.2 says at least 1 ms. */
1492 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1494 /* wait for phy to become ready, if necessary */
1497 sstatus
= scr_read(ap
, SCR_STATUS
);
1498 if ((sstatus
& 0xf) != 1)
1500 } while (time_before(jiffies
, timeout
));
1502 /* TODO: phy layer with polling, timeouts, etc. */
1503 sstatus
= scr_read(ap
, SCR_STATUS
);
1504 if (sata_dev_present(ap
)) {
1508 tmp
= (sstatus
>> 4) & 0xf;
1511 else if (tmp
& (1 << 1))
1514 speed
= "<unknown>";
1515 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1516 ap
->id
, speed
, sstatus
);
1519 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1521 ata_port_disable(ap
);
1524 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1527 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1528 ata_port_disable(ap
);
1532 ap
->cbl
= ATA_CBL_SATA
;
1536 * sata_phy_reset - Reset SATA bus.
1537 * @ap: SATA port associated with target SATA PHY.
1539 * This function resets the SATA bus, and then probes
1540 * the bus for devices.
1543 * PCI/etc. bus probe sem.
1546 void sata_phy_reset(struct ata_port
*ap
)
1548 __sata_phy_reset(ap
);
1549 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1555 * ata_port_disable - Disable port.
1556 * @ap: Port to be disabled.
1558 * Modify @ap data structure such that the system
1559 * thinks that the entire port is disabled, and should
1560 * never attempt to probe or communicate with devices
1563 * LOCKING: host_set lock, or some other form of
1567 void ata_port_disable(struct ata_port
*ap
)
1569 ap
->device
[0].class = ATA_DEV_NONE
;
1570 ap
->device
[1].class = ATA_DEV_NONE
;
1571 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1575 * This mode timing computation functionality is ported over from
1576 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1579 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1580 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1581 * for PIO 5, which is a nonstandard extension and UDMA6, which
1582 * is currently supported only by Maxtor drives.
1585 static const struct ata_timing ata_timing
[] = {
1587 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1588 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1589 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1590 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1592 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1593 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1594 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1596 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1598 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1599 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1600 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1602 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1603 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1604 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1606 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1607 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1608 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1610 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1611 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1612 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1614 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1619 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1620 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1622 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1624 q
->setup
= EZ(t
->setup
* 1000, T
);
1625 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1626 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1627 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1628 q
->active
= EZ(t
->active
* 1000, T
);
1629 q
->recover
= EZ(t
->recover
* 1000, T
);
1630 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1631 q
->udma
= EZ(t
->udma
* 1000, UT
);
1634 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1635 struct ata_timing
*m
, unsigned int what
)
1637 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1638 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1639 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1640 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1641 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1642 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1643 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1644 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1647 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1649 const struct ata_timing
*t
;
1651 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1652 if (t
->mode
== 0xFF)
1657 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1658 struct ata_timing
*t
, int T
, int UT
)
1660 const struct ata_timing
*s
;
1661 struct ata_timing p
;
1667 if (!(s
= ata_timing_find_mode(speed
)))
1670 memcpy(t
, s
, sizeof(*s
));
1673 * If the drive is an EIDE drive, it can tell us it needs extended
1674 * PIO/MW_DMA cycle timing.
1677 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1678 memset(&p
, 0, sizeof(p
));
1679 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1680 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1681 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1682 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1683 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1685 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1689 * Convert the timing to bus clock counts.
1692 ata_timing_quantize(t
, t
, T
, UT
);
1695 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
1696 * and some other commands. We have to ensure that the DMA cycle timing is
1697 * slower/equal than the fastest PIO timing.
1700 if (speed
> XFER_PIO_4
) {
1701 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1702 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1706 * Lenghten active & recovery time so that cycle time is correct.
1709 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1710 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1711 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1714 if (t
->active
+ t
->recover
< t
->cycle
) {
1715 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1716 t
->recover
= t
->cycle
- t
->active
;
1722 static const struct {
1725 } xfer_mode_classes
[] = {
1726 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1727 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1728 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1731 static inline u8
base_from_shift(unsigned int shift
)
1735 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1736 if (xfer_mode_classes
[i
].shift
== shift
)
1737 return xfer_mode_classes
[i
].base
;
1742 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1747 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1750 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1751 dev
->flags
|= ATA_DFLAG_PIO
;
1753 ata_dev_set_xfermode(ap
, dev
);
1755 base
= base_from_shift(dev
->xfer_shift
);
1756 ofs
= dev
->xfer_mode
- base
;
1757 idx
= ofs
+ dev
->xfer_shift
;
1758 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1760 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1761 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1763 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1764 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1767 static int ata_host_set_pio(struct ata_port
*ap
)
1773 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1776 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1780 base
= base_from_shift(ATA_SHIFT_PIO
);
1781 xfer_mode
= base
+ x
;
1783 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1784 (int)base
, (int)xfer_mode
, mask
, x
);
1786 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1787 struct ata_device
*dev
= &ap
->device
[i
];
1788 if (ata_dev_present(dev
)) {
1789 dev
->pio_mode
= xfer_mode
;
1790 dev
->xfer_mode
= xfer_mode
;
1791 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1792 if (ap
->ops
->set_piomode
)
1793 ap
->ops
->set_piomode(ap
, dev
);
1800 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1801 unsigned int xfer_shift
)
1805 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1806 struct ata_device
*dev
= &ap
->device
[i
];
1807 if (ata_dev_present(dev
)) {
1808 dev
->dma_mode
= xfer_mode
;
1809 dev
->xfer_mode
= xfer_mode
;
1810 dev
->xfer_shift
= xfer_shift
;
1811 if (ap
->ops
->set_dmamode
)
1812 ap
->ops
->set_dmamode(ap
, dev
);
1818 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1819 * @ap: port on which timings will be programmed
1821 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1824 * PCI/etc. bus probe sem.
1827 static void ata_set_mode(struct ata_port
*ap
)
1829 unsigned int xfer_shift
;
1833 /* step 1: always set host PIO timings */
1834 rc
= ata_host_set_pio(ap
);
1838 /* step 2: choose the best data xfer mode */
1839 xfer_mode
= xfer_shift
= 0;
1840 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1844 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1845 if (xfer_shift
!= ATA_SHIFT_PIO
)
1846 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1848 /* step 4: update devices' xfer mode */
1849 ata_dev_set_mode(ap
, &ap
->device
[0]);
1850 ata_dev_set_mode(ap
, &ap
->device
[1]);
1852 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1855 if (ap
->ops
->post_set_mode
)
1856 ap
->ops
->post_set_mode(ap
);
1861 ata_port_disable(ap
);
1865 * ata_busy_sleep - sleep until BSY clears, or timeout
1866 * @ap: port containing status register to be polled
1867 * @tmout_pat: impatience timeout
1868 * @tmout: overall timeout
1870 * Sleep until ATA Status register bit BSY clears,
1871 * or a timeout occurs.
1877 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1878 unsigned long tmout_pat
,
1879 unsigned long tmout
)
1881 unsigned long timer_start
, timeout
;
1884 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1885 timer_start
= jiffies
;
1886 timeout
= timer_start
+ tmout_pat
;
1887 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1889 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1892 if (status
& ATA_BUSY
)
1893 printk(KERN_WARNING
"ata%u is slow to respond, "
1894 "please be patient\n", ap
->id
);
1896 timeout
= timer_start
+ tmout
;
1897 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1899 status
= ata_chk_status(ap
);
1902 if (status
& ATA_BUSY
) {
1903 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1904 ap
->id
, tmout
/ HZ
);
1911 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1913 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1914 unsigned int dev0
= devmask
& (1 << 0);
1915 unsigned int dev1
= devmask
& (1 << 1);
1916 unsigned long timeout
;
1918 /* if device 0 was found in ata_devchk, wait for its
1922 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1924 /* if device 1 was found in ata_devchk, wait for
1925 * register access, then wait for BSY to clear
1927 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1931 ap
->ops
->dev_select(ap
, 1);
1932 if (ap
->flags
& ATA_FLAG_MMIO
) {
1933 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1934 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1936 nsect
= inb(ioaddr
->nsect_addr
);
1937 lbal
= inb(ioaddr
->lbal_addr
);
1939 if ((nsect
== 1) && (lbal
== 1))
1941 if (time_after(jiffies
, timeout
)) {
1945 msleep(50); /* give drive a breather */
1948 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1950 /* is all this really necessary? */
1951 ap
->ops
->dev_select(ap
, 0);
1953 ap
->ops
->dev_select(ap
, 1);
1955 ap
->ops
->dev_select(ap
, 0);
1959 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1960 * @ap: Port to reset and probe
1962 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1963 * probe the bus. Not often used these days.
1966 * PCI/etc. bus probe sem.
1967 * Obtains host_set lock.
1971 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1973 struct ata_taskfile tf
;
1974 unsigned long flags
;
1976 /* set up execute-device-diag (bus reset) taskfile */
1977 /* also, take interrupts to a known state (disabled) */
1978 DPRINTK("execute-device-diag\n");
1979 ata_tf_init(ap
, &tf
, 0);
1981 tf
.command
= ATA_CMD_EDD
;
1982 tf
.protocol
= ATA_PROT_NODATA
;
1985 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1986 ata_tf_to_host(ap
, &tf
);
1987 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1989 /* spec says at least 2ms. but who knows with those
1990 * crazy ATAPI devices...
1994 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1997 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1998 unsigned int devmask
)
2000 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2002 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2004 /* software reset. causes dev0 to be selected */
2005 if (ap
->flags
& ATA_FLAG_MMIO
) {
2006 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2007 udelay(20); /* FIXME: flush */
2008 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2009 udelay(20); /* FIXME: flush */
2010 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2012 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2014 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2016 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2019 /* spec mandates ">= 2ms" before checking status.
2020 * We wait 150ms, because that was the magic delay used for
2021 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2022 * between when the ATA command register is written, and then
2023 * status is checked. Because waiting for "a while" before
2024 * checking status is fine, post SRST, we perform this magic
2025 * delay here as well.
2029 ata_bus_post_reset(ap
, devmask
);
2035 * ata_bus_reset - reset host port and associated ATA channel
2036 * @ap: port to reset
2038 * This is typically the first time we actually start issuing
2039 * commands to the ATA channel. We wait for BSY to clear, then
2040 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2041 * result. Determine what devices, if any, are on the channel
2042 * by looking at the device 0/1 error register. Look at the signature
2043 * stored in each device's taskfile registers, to determine if
2044 * the device is ATA or ATAPI.
2047 * PCI/etc. bus probe sem.
2048 * Obtains host_set lock.
2051 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2054 void ata_bus_reset(struct ata_port
*ap
)
2056 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2057 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2059 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2061 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2063 /* determine if device 0/1 are present */
2064 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2067 dev0
= ata_devchk(ap
, 0);
2069 dev1
= ata_devchk(ap
, 1);
2073 devmask
|= (1 << 0);
2075 devmask
|= (1 << 1);
2077 /* select device 0 again */
2078 ap
->ops
->dev_select(ap
, 0);
2080 /* issue bus reset */
2081 if (ap
->flags
& ATA_FLAG_SRST
)
2082 rc
= ata_bus_softreset(ap
, devmask
);
2083 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2084 /* set up device control */
2085 if (ap
->flags
& ATA_FLAG_MMIO
)
2086 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2088 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2089 rc
= ata_bus_edd(ap
);
2096 * determine by signature whether we have ATA or ATAPI devices
2098 err
= ata_dev_try_classify(ap
, 0);
2099 if ((slave_possible
) && (err
!= 0x81))
2100 ata_dev_try_classify(ap
, 1);
2102 /* re-enable interrupts */
2103 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2106 /* is double-select really necessary? */
2107 if (ap
->device
[1].class != ATA_DEV_NONE
)
2108 ap
->ops
->dev_select(ap
, 1);
2109 if (ap
->device
[0].class != ATA_DEV_NONE
)
2110 ap
->ops
->dev_select(ap
, 0);
2112 /* if no devices were detected, disable this port */
2113 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2114 (ap
->device
[1].class == ATA_DEV_NONE
))
2117 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2118 /* set up device control for ATA_FLAG_SATA_RESET */
2119 if (ap
->flags
& ATA_FLAG_MMIO
)
2120 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2122 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2129 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2130 ap
->ops
->port_disable(ap
);
2135 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2136 const struct ata_device
*dev
)
2138 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2139 ap
->id
, dev
->devno
);
2142 static const char * const ata_dma_blacklist
[] = {
2161 "Toshiba CD-ROM XM-6202B",
2162 "TOSHIBA CD-ROM XM-1702BC",
2164 "E-IDE CD-ROM CR-840",
2167 "SAMSUNG CD-ROM SC-148C",
2168 "SAMSUNG CD-ROM SC",
2170 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2174 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2176 unsigned char model_num
[40];
2181 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2184 len
= strnlen(s
, sizeof(model_num
));
2186 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2187 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2192 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2193 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2199 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2201 const struct ata_device
*master
, *slave
;
2204 master
= &ap
->device
[0];
2205 slave
= &ap
->device
[1];
2207 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2209 if (shift
== ATA_SHIFT_UDMA
) {
2210 mask
= ap
->udma_mask
;
2211 if (ata_dev_present(master
)) {
2212 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2213 if (ata_dma_blacklisted(master
)) {
2215 ata_pr_blacklisted(ap
, master
);
2218 if (ata_dev_present(slave
)) {
2219 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2220 if (ata_dma_blacklisted(slave
)) {
2222 ata_pr_blacklisted(ap
, slave
);
2226 else if (shift
== ATA_SHIFT_MWDMA
) {
2227 mask
= ap
->mwdma_mask
;
2228 if (ata_dev_present(master
)) {
2229 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2230 if (ata_dma_blacklisted(master
)) {
2232 ata_pr_blacklisted(ap
, master
);
2235 if (ata_dev_present(slave
)) {
2236 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2237 if (ata_dma_blacklisted(slave
)) {
2239 ata_pr_blacklisted(ap
, slave
);
2243 else if (shift
== ATA_SHIFT_PIO
) {
2244 mask
= ap
->pio_mask
;
2245 if (ata_dev_present(master
)) {
2246 /* spec doesn't return explicit support for
2247 * PIO0-2, so we fake it
2249 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2254 if (ata_dev_present(slave
)) {
2255 /* spec doesn't return explicit support for
2256 * PIO0-2, so we fake it
2258 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2265 mask
= 0xffffffff; /* shut up compiler warning */
2272 /* find greatest bit */
2273 static int fgb(u32 bitmap
)
2278 for (i
= 0; i
< 32; i
++)
2279 if (bitmap
& (1 << i
))
2286 * ata_choose_xfer_mode - attempt to find best transfer mode
2287 * @ap: Port for which an xfer mode will be selected
2288 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2289 * @xfer_shift_out: (output) bit shift that selects this mode
2291 * Based on host and device capabilities, determine the
2292 * maximum transfer mode that is amenable to all.
2295 * PCI/etc. bus probe sem.
2298 * Zero on success, negative on error.
2301 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2303 unsigned int *xfer_shift_out
)
2305 unsigned int mask
, shift
;
2308 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2309 shift
= xfer_mode_classes
[i
].shift
;
2310 mask
= ata_get_mode_mask(ap
, shift
);
2314 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2315 *xfer_shift_out
= shift
;
2324 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2325 * @ap: Port associated with device @dev
2326 * @dev: Device to which command will be sent
2328 * Issue SET FEATURES - XFER MODE command to device @dev
2332 * PCI/etc. bus probe sem.
2335 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2337 struct ata_taskfile tf
;
2339 /* set up set-features taskfile */
2340 DPRINTK("set features - xfer mode\n");
2342 ata_tf_init(ap
, &tf
, dev
->devno
);
2343 tf
.command
= ATA_CMD_SET_FEATURES
;
2344 tf
.feature
= SETFEATURES_XFER
;
2345 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2346 tf
.protocol
= ATA_PROT_NODATA
;
2347 tf
.nsect
= dev
->xfer_mode
;
2349 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2350 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2352 ata_port_disable(ap
);
2359 * ata_dev_reread_id - Reread the device identify device info
2360 * @ap: port where the device is
2361 * @dev: device to reread the identify device info
2366 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2368 struct ata_taskfile tf
;
2370 ata_tf_init(ap
, &tf
, dev
->devno
);
2372 if (dev
->class == ATA_DEV_ATA
) {
2373 tf
.command
= ATA_CMD_ID_ATA
;
2374 DPRINTK("do ATA identify\n");
2376 tf
.command
= ATA_CMD_ID_ATAPI
;
2377 DPRINTK("do ATAPI identify\n");
2380 tf
.flags
|= ATA_TFLAG_DEVICE
;
2381 tf
.protocol
= ATA_PROT_PIO
;
2383 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2384 dev
->id
, sizeof(dev
->id
)))
2387 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2395 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2396 ata_port_disable(ap
);
2400 * ata_dev_init_params - Issue INIT DEV PARAMS command
2401 * @ap: Port associated with device @dev
2402 * @dev: Device to which command will be sent
2407 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2409 struct ata_taskfile tf
;
2410 u16 sectors
= dev
->id
[6];
2411 u16 heads
= dev
->id
[3];
2413 /* Number of sectors per track 1-255. Number of heads 1-16 */
2414 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2417 /* set up init dev params taskfile */
2418 DPRINTK("init dev params \n");
2420 ata_tf_init(ap
, &tf
, dev
->devno
);
2421 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2422 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2423 tf
.protocol
= ATA_PROT_NODATA
;
2425 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2427 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2428 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2430 ata_port_disable(ap
);
2437 * ata_sg_clean - Unmap DMA memory associated with command
2438 * @qc: Command containing DMA memory to be released
2440 * Unmap all mapped DMA memory associated with this command.
2443 * spin_lock_irqsave(host_set lock)
2446 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2448 struct ata_port
*ap
= qc
->ap
;
2449 struct scatterlist
*sg
= qc
->__sg
;
2450 int dir
= qc
->dma_dir
;
2451 void *pad_buf
= NULL
;
2453 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2456 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2457 assert(qc
->n_elem
== 1);
2459 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2461 /* if we padded the buffer out to 32-bit bound, and data
2462 * xfer direction is from-device, we must copy from the
2463 * pad buffer back into the supplied buffer
2465 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2466 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2468 if (qc
->flags
& ATA_QCFLAG_SG
) {
2470 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2471 /* restore last sg */
2472 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2474 struct scatterlist
*psg
= &qc
->pad_sgent
;
2475 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2476 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2477 kunmap_atomic(addr
, KM_IRQ0
);
2480 if (sg_dma_len(&sg
[0]) > 0)
2481 dma_unmap_single(ap
->host_set
->dev
,
2482 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2485 sg
->length
+= qc
->pad_len
;
2487 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2488 pad_buf
, qc
->pad_len
);
2491 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2496 * ata_fill_sg - Fill PCI IDE PRD table
2497 * @qc: Metadata associated with taskfile to be transferred
2499 * Fill PCI IDE PRD (scatter-gather) table with segments
2500 * associated with the current disk command.
2503 * spin_lock_irqsave(host_set lock)
2506 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2508 struct ata_port
*ap
= qc
->ap
;
2509 struct scatterlist
*sg
;
2512 assert(qc
->__sg
!= NULL
);
2513 assert(qc
->n_elem
> 0);
2516 ata_for_each_sg(sg
, qc
) {
2520 /* determine if physical DMA addr spans 64K boundary.
2521 * Note h/w doesn't support 64-bit, so we unconditionally
2522 * truncate dma_addr_t to u32.
2524 addr
= (u32
) sg_dma_address(sg
);
2525 sg_len
= sg_dma_len(sg
);
2528 offset
= addr
& 0xffff;
2530 if ((offset
+ sg_len
) > 0x10000)
2531 len
= 0x10000 - offset
;
2533 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2534 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2535 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2544 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2547 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2548 * @qc: Metadata associated with taskfile to check
2550 * Allow low-level driver to filter ATA PACKET commands, returning
2551 * a status indicating whether or not it is OK to use DMA for the
2552 * supplied PACKET command.
2555 * spin_lock_irqsave(host_set lock)
2557 * RETURNS: 0 when ATAPI DMA can be used
2560 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2562 struct ata_port
*ap
= qc
->ap
;
2563 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2565 if (ap
->ops
->check_atapi_dma
)
2566 rc
= ap
->ops
->check_atapi_dma(qc
);
2571 * ata_qc_prep - Prepare taskfile for submission
2572 * @qc: Metadata associated with taskfile to be prepared
2574 * Prepare ATA taskfile for submission.
2577 * spin_lock_irqsave(host_set lock)
2579 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2581 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2588 * ata_sg_init_one - Associate command with memory buffer
2589 * @qc: Command to be associated
2590 * @buf: Memory buffer
2591 * @buflen: Length of memory buffer, in bytes.
2593 * Initialize the data-related elements of queued_cmd @qc
2594 * to point to a single memory buffer, @buf of byte length @buflen.
2597 * spin_lock_irqsave(host_set lock)
2600 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2602 struct scatterlist
*sg
;
2604 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2606 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2607 qc
->__sg
= &qc
->sgent
;
2609 qc
->orig_n_elem
= 1;
2613 sg_init_one(sg
, buf
, buflen
);
2617 * ata_sg_init - Associate command with scatter-gather table.
2618 * @qc: Command to be associated
2619 * @sg: Scatter-gather table.
2620 * @n_elem: Number of elements in s/g table.
2622 * Initialize the data-related elements of queued_cmd @qc
2623 * to point to a scatter-gather table @sg, containing @n_elem
2627 * spin_lock_irqsave(host_set lock)
2630 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2631 unsigned int n_elem
)
2633 qc
->flags
|= ATA_QCFLAG_SG
;
2635 qc
->n_elem
= n_elem
;
2636 qc
->orig_n_elem
= n_elem
;
2640 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2641 * @qc: Command with memory buffer to be mapped.
2643 * DMA-map the memory buffer associated with queued_cmd @qc.
2646 * spin_lock_irqsave(host_set lock)
2649 * Zero on success, negative on error.
2652 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2654 struct ata_port
*ap
= qc
->ap
;
2655 int dir
= qc
->dma_dir
;
2656 struct scatterlist
*sg
= qc
->__sg
;
2657 dma_addr_t dma_address
;
2659 /* we must lengthen transfers to end on a 32-bit boundary */
2660 qc
->pad_len
= sg
->length
& 3;
2662 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2663 struct scatterlist
*psg
= &qc
->pad_sgent
;
2665 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2667 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2669 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2670 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2673 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2674 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2676 sg
->length
-= qc
->pad_len
;
2678 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2679 sg
->length
, qc
->pad_len
);
2683 sg_dma_address(sg
) = 0;
2687 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2689 if (dma_mapping_error(dma_address
)) {
2691 sg
->length
+= qc
->pad_len
;
2695 sg_dma_address(sg
) = dma_address
;
2697 sg_dma_len(sg
) = sg
->length
;
2699 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2700 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2706 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2707 * @qc: Command with scatter-gather table to be mapped.
2709 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2712 * spin_lock_irqsave(host_set lock)
2715 * Zero on success, negative on error.
2719 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2721 struct ata_port
*ap
= qc
->ap
;
2722 struct scatterlist
*sg
= qc
->__sg
;
2723 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2724 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2726 VPRINTK("ENTER, ata%u\n", ap
->id
);
2727 assert(qc
->flags
& ATA_QCFLAG_SG
);
2729 /* we must lengthen transfers to end on a 32-bit boundary */
2730 qc
->pad_len
= lsg
->length
& 3;
2732 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2733 struct scatterlist
*psg
= &qc
->pad_sgent
;
2734 unsigned int offset
;
2736 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2738 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2741 * psg->page/offset are used to copy to-be-written
2742 * data in this function or read data in ata_sg_clean.
2744 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2745 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2746 psg
->offset
= offset_in_page(offset
);
2748 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2749 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2750 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2751 kunmap_atomic(addr
, KM_IRQ0
);
2754 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2755 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2757 lsg
->length
-= qc
->pad_len
;
2758 if (lsg
->length
== 0)
2761 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2762 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2765 pre_n_elem
= qc
->n_elem
;
2766 if (trim_sg
&& pre_n_elem
)
2775 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2777 /* restore last sg */
2778 lsg
->length
+= qc
->pad_len
;
2782 DPRINTK("%d sg elements mapped\n", n_elem
);
2785 qc
->n_elem
= n_elem
;
2791 * ata_poll_qc_complete - turn irq back on and finish qc
2792 * @qc: Command to complete
2793 * @err_mask: ATA status register content
2796 * None. (grabs host lock)
2799 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2801 struct ata_port
*ap
= qc
->ap
;
2802 unsigned long flags
;
2804 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2805 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2807 ata_qc_complete(qc
);
2808 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2813 * @ap: the target ata_port
2816 * None. (executing in kernel thread context)
2819 * timeout value to use
2822 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2824 struct ata_queued_cmd
*qc
;
2826 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2827 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2829 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2832 switch (ap
->hsm_task_state
) {
2835 poll_state
= HSM_ST_POLL
;
2839 case HSM_ST_LAST_POLL
:
2840 poll_state
= HSM_ST_LAST_POLL
;
2841 reg_state
= HSM_ST_LAST
;
2848 status
= ata_chk_status(ap
);
2849 if (status
& ATA_BUSY
) {
2850 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2851 qc
->err_mask
|= AC_ERR_ATA_BUS
;
2852 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2855 ap
->hsm_task_state
= poll_state
;
2856 return ATA_SHORT_PAUSE
;
2859 ap
->hsm_task_state
= reg_state
;
2864 * ata_pio_complete - check if drive is busy or idle
2865 * @ap: the target ata_port
2868 * None. (executing in kernel thread context)
2871 * Non-zero if qc completed, zero otherwise.
2874 static int ata_pio_complete (struct ata_port
*ap
)
2876 struct ata_queued_cmd
*qc
;
2880 * This is purely heuristic. This is a fast path. Sometimes when
2881 * we enter, BSY will be cleared in a chk-status or two. If not,
2882 * the drive is probably seeking or something. Snooze for a couple
2883 * msecs, then chk-status again. If still busy, fall back to
2884 * HSM_ST_POLL state.
2886 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2887 if (drv_stat
& ATA_BUSY
) {
2889 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2890 if (drv_stat
& ATA_BUSY
) {
2891 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2892 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2897 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2900 drv_stat
= ata_wait_idle(ap
);
2901 if (!ata_ok(drv_stat
)) {
2902 qc
->err_mask
|= __ac_err_mask(drv_stat
);
2903 ap
->hsm_task_state
= HSM_ST_ERR
;
2907 ap
->hsm_task_state
= HSM_ST_IDLE
;
2909 assert(qc
->err_mask
== 0);
2910 ata_poll_qc_complete(qc
);
2912 /* another command may start at this point */
2919 * swap_buf_le16 - swap halves of 16-words in place
2920 * @buf: Buffer to swap
2921 * @buf_words: Number of 16-bit words in buffer.
2923 * Swap halves of 16-bit words if needed to convert from
2924 * little-endian byte order to native cpu byte order, or
2928 * Inherited from caller.
2930 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
2935 for (i
= 0; i
< buf_words
; i
++)
2936 buf
[i
] = le16_to_cpu(buf
[i
]);
2937 #endif /* __BIG_ENDIAN */
2941 * ata_mmio_data_xfer - Transfer data by MMIO
2942 * @ap: port to read/write
2944 * @buflen: buffer length
2945 * @write_data: read/write
2947 * Transfer data from/to the device data register by MMIO.
2950 * Inherited from caller.
2953 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2954 unsigned int buflen
, int write_data
)
2957 unsigned int words
= buflen
>> 1;
2958 u16
*buf16
= (u16
*) buf
;
2959 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
2961 /* Transfer multiple of 2 bytes */
2963 for (i
= 0; i
< words
; i
++)
2964 writew(le16_to_cpu(buf16
[i
]), mmio
);
2966 for (i
= 0; i
< words
; i
++)
2967 buf16
[i
] = cpu_to_le16(readw(mmio
));
2970 /* Transfer trailing 1 byte, if any. */
2971 if (unlikely(buflen
& 0x01)) {
2972 u16 align_buf
[1] = { 0 };
2973 unsigned char *trailing_buf
= buf
+ buflen
- 1;
2976 memcpy(align_buf
, trailing_buf
, 1);
2977 writew(le16_to_cpu(align_buf
[0]), mmio
);
2979 align_buf
[0] = cpu_to_le16(readw(mmio
));
2980 memcpy(trailing_buf
, align_buf
, 1);
2986 * ata_pio_data_xfer - Transfer data by PIO
2987 * @ap: port to read/write
2989 * @buflen: buffer length
2990 * @write_data: read/write
2992 * Transfer data from/to the device data register by PIO.
2995 * Inherited from caller.
2998 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2999 unsigned int buflen
, int write_data
)
3001 unsigned int words
= buflen
>> 1;
3003 /* Transfer multiple of 2 bytes */
3005 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3007 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3009 /* Transfer trailing 1 byte, if any. */
3010 if (unlikely(buflen
& 0x01)) {
3011 u16 align_buf
[1] = { 0 };
3012 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3015 memcpy(align_buf
, trailing_buf
, 1);
3016 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3018 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3019 memcpy(trailing_buf
, align_buf
, 1);
3025 * ata_data_xfer - Transfer data from/to the data register.
3026 * @ap: port to read/write
3028 * @buflen: buffer length
3029 * @do_write: read/write
3031 * Transfer data from/to the device data register.
3034 * Inherited from caller.
3037 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3038 unsigned int buflen
, int do_write
)
3040 if (ap
->flags
& ATA_FLAG_MMIO
)
3041 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3043 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3047 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3048 * @qc: Command on going
3050 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3053 * Inherited from caller.
3056 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3058 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3059 struct scatterlist
*sg
= qc
->__sg
;
3060 struct ata_port
*ap
= qc
->ap
;
3062 unsigned int offset
;
3065 if (qc
->cursect
== (qc
->nsect
- 1))
3066 ap
->hsm_task_state
= HSM_ST_LAST
;
3068 page
= sg
[qc
->cursg
].page
;
3069 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3071 /* get the current page and offset */
3072 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3073 offset
%= PAGE_SIZE
;
3075 buf
= kmap(page
) + offset
;
3080 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3085 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3087 /* do the actual data transfer */
3088 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3089 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3095 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3096 * @qc: Command on going
3097 * @bytes: number of bytes
3099 * Transfer Transfer data from/to the ATAPI device.
3102 * Inherited from caller.
3106 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3108 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3109 struct scatterlist
*sg
= qc
->__sg
;
3110 struct ata_port
*ap
= qc
->ap
;
3113 unsigned int offset
, count
;
3115 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3116 ap
->hsm_task_state
= HSM_ST_LAST
;
3119 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3121 * The end of qc->sg is reached and the device expects
3122 * more data to transfer. In order not to overrun qc->sg
3123 * and fulfill length specified in the byte count register,
3124 * - for read case, discard trailing data from the device
3125 * - for write case, padding zero data to the device
3127 u16 pad_buf
[1] = { 0 };
3128 unsigned int words
= bytes
>> 1;
3131 if (words
) /* warning if bytes > 1 */
3132 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3135 for (i
= 0; i
< words
; i
++)
3136 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3138 ap
->hsm_task_state
= HSM_ST_LAST
;
3142 sg
= &qc
->__sg
[qc
->cursg
];
3145 offset
= sg
->offset
+ qc
->cursg_ofs
;
3147 /* get the current page and offset */
3148 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3149 offset
%= PAGE_SIZE
;
3151 /* don't overrun current sg */
3152 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3154 /* don't cross page boundaries */
3155 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3157 buf
= kmap(page
) + offset
;
3160 qc
->curbytes
+= count
;
3161 qc
->cursg_ofs
+= count
;
3163 if (qc
->cursg_ofs
== sg
->length
) {
3168 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3170 /* do the actual data transfer */
3171 ata_data_xfer(ap
, buf
, count
, do_write
);
3180 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3181 * @qc: Command on going
3183 * Transfer Transfer data from/to the ATAPI device.
3186 * Inherited from caller.
3189 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3191 struct ata_port
*ap
= qc
->ap
;
3192 struct ata_device
*dev
= qc
->dev
;
3193 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3194 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3196 ap
->ops
->tf_read(ap
, &qc
->tf
);
3197 ireason
= qc
->tf
.nsect
;
3198 bc_lo
= qc
->tf
.lbam
;
3199 bc_hi
= qc
->tf
.lbah
;
3200 bytes
= (bc_hi
<< 8) | bc_lo
;
3202 /* shall be cleared to zero, indicating xfer of data */
3203 if (ireason
& (1 << 0))
3206 /* make sure transfer direction matches expected */
3207 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3208 if (do_write
!= i_write
)
3211 __atapi_pio_bytes(qc
, bytes
);
3216 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3217 ap
->id
, dev
->devno
);
3218 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3219 ap
->hsm_task_state
= HSM_ST_ERR
;
3223 * ata_pio_block - start PIO on a block
3224 * @ap: the target ata_port
3227 * None. (executing in kernel thread context)
3230 static void ata_pio_block(struct ata_port
*ap
)
3232 struct ata_queued_cmd
*qc
;
3236 * This is purely heuristic. This is a fast path.
3237 * Sometimes when we enter, BSY will be cleared in
3238 * a chk-status or two. If not, the drive is probably seeking
3239 * or something. Snooze for a couple msecs, then
3240 * chk-status again. If still busy, fall back to
3241 * HSM_ST_POLL state.
3243 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3244 if (status
& ATA_BUSY
) {
3246 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3247 if (status
& ATA_BUSY
) {
3248 ap
->hsm_task_state
= HSM_ST_POLL
;
3249 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3254 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3258 if (status
& (ATA_ERR
| ATA_DF
)) {
3259 qc
->err_mask
|= AC_ERR_DEV
;
3260 ap
->hsm_task_state
= HSM_ST_ERR
;
3264 /* transfer data if any */
3265 if (is_atapi_taskfile(&qc
->tf
)) {
3266 /* DRQ=0 means no more data to transfer */
3267 if ((status
& ATA_DRQ
) == 0) {
3268 ap
->hsm_task_state
= HSM_ST_LAST
;
3272 atapi_pio_bytes(qc
);
3274 /* handle BSY=0, DRQ=0 as error */
3275 if ((status
& ATA_DRQ
) == 0) {
3276 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3277 ap
->hsm_task_state
= HSM_ST_ERR
;
3285 static void ata_pio_error(struct ata_port
*ap
)
3287 struct ata_queued_cmd
*qc
;
3289 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3291 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3294 /* make sure qc->err_mask is available to
3295 * know what's wrong and recover
3297 assert(qc
->err_mask
);
3299 ap
->hsm_task_state
= HSM_ST_IDLE
;
3301 ata_poll_qc_complete(qc
);
3304 static void ata_pio_task(void *_data
)
3306 struct ata_port
*ap
= _data
;
3307 unsigned long timeout
;
3314 switch (ap
->hsm_task_state
) {
3323 qc_completed
= ata_pio_complete(ap
);
3327 case HSM_ST_LAST_POLL
:
3328 timeout
= ata_pio_poll(ap
);
3338 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
3339 else if (!qc_completed
)
3344 * ata_qc_timeout - Handle timeout of queued command
3345 * @qc: Command that timed out
3347 * Some part of the kernel (currently, only the SCSI layer)
3348 * has noticed that the active command on port @ap has not
3349 * completed after a specified length of time. Handle this
3350 * condition by disabling DMA (if necessary) and completing
3351 * transactions, with error if necessary.
3353 * This also handles the case of the "lost interrupt", where
3354 * for some reason (possibly hardware bug, possibly driver bug)
3355 * an interrupt was not delivered to the driver, even though the
3356 * transaction completed successfully.
3359 * Inherited from SCSI layer (none, can sleep)
3362 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3364 struct ata_port
*ap
= qc
->ap
;
3365 struct ata_host_set
*host_set
= ap
->host_set
;
3366 u8 host_stat
= 0, drv_stat
;
3367 unsigned long flags
;
3371 spin_lock_irqsave(&host_set
->lock
, flags
);
3373 /* hack alert! We cannot use the supplied completion
3374 * function from inside the ->eh_strategy_handler() thread.
3375 * libata is the only user of ->eh_strategy_handler() in
3376 * any kernel, so the default scsi_done() assumes it is
3377 * not being called from the SCSI EH.
3379 qc
->scsidone
= scsi_finish_command
;
3381 switch (qc
->tf
.protocol
) {
3384 case ATA_PROT_ATAPI_DMA
:
3385 host_stat
= ap
->ops
->bmdma_status(ap
);
3387 /* before we do anything else, clear DMA-Start bit */
3388 ap
->ops
->bmdma_stop(qc
);
3394 drv_stat
= ata_chk_status(ap
);
3396 /* ack bmdma irq events */
3397 ap
->ops
->irq_clear(ap
);
3399 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3400 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3402 /* complete taskfile transaction */
3403 qc
->err_mask
|= ac_err_mask(drv_stat
);
3404 ata_qc_complete(qc
);
3408 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3414 * ata_eng_timeout - Handle timeout of queued command
3415 * @ap: Port on which timed-out command is active
3417 * Some part of the kernel (currently, only the SCSI layer)
3418 * has noticed that the active command on port @ap has not
3419 * completed after a specified length of time. Handle this
3420 * condition by disabling DMA (if necessary) and completing
3421 * transactions, with error if necessary.
3423 * This also handles the case of the "lost interrupt", where
3424 * for some reason (possibly hardware bug, possibly driver bug)
3425 * an interrupt was not delivered to the driver, even though the
3426 * transaction completed successfully.
3429 * Inherited from SCSI layer (none, can sleep)
3432 void ata_eng_timeout(struct ata_port
*ap
)
3434 struct ata_queued_cmd
*qc
;
3438 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3442 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3452 * ata_qc_new - Request an available ATA command, for queueing
3453 * @ap: Port associated with device @dev
3454 * @dev: Device from whom we request an available command structure
3460 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3462 struct ata_queued_cmd
*qc
= NULL
;
3465 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3466 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3467 qc
= ata_qc_from_tag(ap
, i
);
3478 * ata_qc_new_init - Request an available ATA command, and initialize it
3479 * @ap: Port associated with device @dev
3480 * @dev: Device from whom we request an available command structure
3486 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3487 struct ata_device
*dev
)
3489 struct ata_queued_cmd
*qc
;
3491 qc
= ata_qc_new(ap
);
3503 static void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3505 struct ata_port
*ap
= qc
->ap
;
3510 if (likely(ata_tag_valid(tag
))) {
3511 if (tag
== ap
->active_tag
)
3512 ap
->active_tag
= ATA_TAG_POISON
;
3513 qc
->tag
= ATA_TAG_POISON
;
3514 clear_bit(tag
, &ap
->qactive
);
3519 * ata_qc_free - free unused ata_queued_cmd
3520 * @qc: Command to complete
3522 * Designed to free unused ata_queued_cmd object
3523 * in case something prevents using it.
3526 * spin_lock_irqsave(host_set lock)
3528 void ata_qc_free(struct ata_queued_cmd
*qc
)
3530 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3532 __ata_qc_complete(qc
);
3536 * ata_qc_complete - Complete an active ATA command
3537 * @qc: Command to complete
3538 * @err_mask: ATA Status register contents
3540 * Indicate to the mid and upper layers that an ATA
3541 * command has completed, with either an ok or not-ok status.
3544 * spin_lock_irqsave(host_set lock)
3547 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3551 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3552 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3554 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3557 /* atapi: mark qc as inactive to prevent the interrupt handler
3558 * from completing the command twice later, before the error handler
3559 * is called. (when rc != 0 and atapi request sense is needed)
3561 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3563 /* call completion callback */
3564 rc
= qc
->complete_fn(qc
);
3566 /* if callback indicates not to complete command (non-zero),
3567 * return immediately
3572 __ata_qc_complete(qc
);
3577 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3579 struct ata_port
*ap
= qc
->ap
;
3581 switch (qc
->tf
.protocol
) {
3583 case ATA_PROT_ATAPI_DMA
:
3586 case ATA_PROT_ATAPI
:
3588 case ATA_PROT_PIO_MULT
:
3589 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3602 * ata_qc_issue - issue taskfile to device
3603 * @qc: command to issue to device
3605 * Prepare an ATA command to submission to device.
3606 * This includes mapping the data into a DMA-able
3607 * area, filling in the S/G table, and finally
3608 * writing the taskfile to hardware, starting the command.
3611 * spin_lock_irqsave(host_set lock)
3614 * Zero on success, negative on error.
3617 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3619 struct ata_port
*ap
= qc
->ap
;
3621 if (ata_should_dma_map(qc
)) {
3622 if (qc
->flags
& ATA_QCFLAG_SG
) {
3623 if (ata_sg_setup(qc
))
3625 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3626 if (ata_sg_setup_one(qc
))
3630 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3633 ap
->ops
->qc_prep(qc
);
3635 qc
->ap
->active_tag
= qc
->tag
;
3636 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3638 return ap
->ops
->qc_issue(qc
);
3646 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3647 * @qc: command to issue to device
3649 * Using various libata functions and hooks, this function
3650 * starts an ATA command. ATA commands are grouped into
3651 * classes called "protocols", and issuing each type of protocol
3652 * is slightly different.
3654 * May be used as the qc_issue() entry in ata_port_operations.
3657 * spin_lock_irqsave(host_set lock)
3660 * Zero on success, negative on error.
3663 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3665 struct ata_port
*ap
= qc
->ap
;
3667 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3669 switch (qc
->tf
.protocol
) {
3670 case ATA_PROT_NODATA
:
3671 ata_tf_to_host(ap
, &qc
->tf
);
3675 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3676 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3677 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3680 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3681 ata_qc_set_polling(qc
);
3682 ata_tf_to_host(ap
, &qc
->tf
);
3683 ap
->hsm_task_state
= HSM_ST
;
3684 queue_work(ata_wq
, &ap
->pio_task
);
3687 case ATA_PROT_ATAPI
:
3688 ata_qc_set_polling(qc
);
3689 ata_tf_to_host(ap
, &qc
->tf
);
3690 queue_work(ata_wq
, &ap
->packet_task
);
3693 case ATA_PROT_ATAPI_NODATA
:
3694 ap
->flags
|= ATA_FLAG_NOINTR
;
3695 ata_tf_to_host(ap
, &qc
->tf
);
3696 queue_work(ata_wq
, &ap
->packet_task
);
3699 case ATA_PROT_ATAPI_DMA
:
3700 ap
->flags
|= ATA_FLAG_NOINTR
;
3701 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3702 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3703 queue_work(ata_wq
, &ap
->packet_task
);
3715 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3716 * @qc: Info associated with this ATA transaction.
3719 * spin_lock_irqsave(host_set lock)
3722 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3724 struct ata_port
*ap
= qc
->ap
;
3725 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3727 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3729 /* load PRD table addr. */
3730 mb(); /* make sure PRD table writes are visible to controller */
3731 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3733 /* specify data direction, triple-check start bit is clear */
3734 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3735 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3737 dmactl
|= ATA_DMA_WR
;
3738 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3740 /* issue r/w command */
3741 ap
->ops
->exec_command(ap
, &qc
->tf
);
3745 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3746 * @qc: Info associated with this ATA transaction.
3749 * spin_lock_irqsave(host_set lock)
3752 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3754 struct ata_port
*ap
= qc
->ap
;
3755 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3758 /* start host DMA transaction */
3759 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3760 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3762 /* Strictly, one may wish to issue a readb() here, to
3763 * flush the mmio write. However, control also passes
3764 * to the hardware at this point, and it will interrupt
3765 * us when we are to resume control. So, in effect,
3766 * we don't care when the mmio write flushes.
3767 * Further, a read of the DMA status register _immediately_
3768 * following the write may not be what certain flaky hardware
3769 * is expected, so I think it is best to not add a readb()
3770 * without first all the MMIO ATA cards/mobos.
3771 * Or maybe I'm just being paranoid.
3776 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3777 * @qc: Info associated with this ATA transaction.
3780 * spin_lock_irqsave(host_set lock)
3783 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3785 struct ata_port
*ap
= qc
->ap
;
3786 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3789 /* load PRD table addr. */
3790 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3792 /* specify data direction, triple-check start bit is clear */
3793 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3794 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3796 dmactl
|= ATA_DMA_WR
;
3797 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3799 /* issue r/w command */
3800 ap
->ops
->exec_command(ap
, &qc
->tf
);
3804 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3805 * @qc: Info associated with this ATA transaction.
3808 * spin_lock_irqsave(host_set lock)
3811 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3813 struct ata_port
*ap
= qc
->ap
;
3816 /* start host DMA transaction */
3817 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3818 outb(dmactl
| ATA_DMA_START
,
3819 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3824 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3825 * @qc: Info associated with this ATA transaction.
3827 * Writes the ATA_DMA_START flag to the DMA command register.
3829 * May be used as the bmdma_start() entry in ata_port_operations.
3832 * spin_lock_irqsave(host_set lock)
3834 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3836 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3837 ata_bmdma_start_mmio(qc
);
3839 ata_bmdma_start_pio(qc
);
3844 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3845 * @qc: Info associated with this ATA transaction.
3847 * Writes address of PRD table to device's PRD Table Address
3848 * register, sets the DMA control register, and calls
3849 * ops->exec_command() to start the transfer.
3851 * May be used as the bmdma_setup() entry in ata_port_operations.
3854 * spin_lock_irqsave(host_set lock)
3856 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3858 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3859 ata_bmdma_setup_mmio(qc
);
3861 ata_bmdma_setup_pio(qc
);
3866 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3867 * @ap: Port associated with this ATA transaction.
3869 * Clear interrupt and error flags in DMA status register.
3871 * May be used as the irq_clear() entry in ata_port_operations.
3874 * spin_lock_irqsave(host_set lock)
3877 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3879 if (ap
->flags
& ATA_FLAG_MMIO
) {
3880 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3881 writeb(readb(mmio
), mmio
);
3883 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3884 outb(inb(addr
), addr
);
3891 * ata_bmdma_status - Read PCI IDE BMDMA status
3892 * @ap: Port associated with this ATA transaction.
3894 * Read and return BMDMA status register.
3896 * May be used as the bmdma_status() entry in ata_port_operations.
3899 * spin_lock_irqsave(host_set lock)
3902 u8
ata_bmdma_status(struct ata_port
*ap
)
3905 if (ap
->flags
& ATA_FLAG_MMIO
) {
3906 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3907 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3909 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3915 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3916 * @qc: Command we are ending DMA for
3918 * Clears the ATA_DMA_START flag in the dma control register
3920 * May be used as the bmdma_stop() entry in ata_port_operations.
3923 * spin_lock_irqsave(host_set lock)
3926 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3928 struct ata_port
*ap
= qc
->ap
;
3929 if (ap
->flags
& ATA_FLAG_MMIO
) {
3930 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3932 /* clear start/stop bit */
3933 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3934 mmio
+ ATA_DMA_CMD
);
3936 /* clear start/stop bit */
3937 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3938 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3941 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
3942 ata_altstatus(ap
); /* dummy read */
3946 * ata_host_intr - Handle host interrupt for given (port, task)
3947 * @ap: Port on which interrupt arrived (possibly...)
3948 * @qc: Taskfile currently active in engine
3950 * Handle host interrupt for given queued command. Currently,
3951 * only DMA interrupts are handled. All other commands are
3952 * handled via polling with interrupts disabled (nIEN bit).
3955 * spin_lock_irqsave(host_set lock)
3958 * One if interrupt was handled, zero if not (shared irq).
3961 inline unsigned int ata_host_intr (struct ata_port
*ap
,
3962 struct ata_queued_cmd
*qc
)
3964 u8 status
, host_stat
;
3966 switch (qc
->tf
.protocol
) {
3969 case ATA_PROT_ATAPI_DMA
:
3970 case ATA_PROT_ATAPI
:
3971 /* check status of DMA engine */
3972 host_stat
= ap
->ops
->bmdma_status(ap
);
3973 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
3975 /* if it's not our irq... */
3976 if (!(host_stat
& ATA_DMA_INTR
))
3979 /* before we do anything else, clear DMA-Start bit */
3980 ap
->ops
->bmdma_stop(qc
);
3984 case ATA_PROT_ATAPI_NODATA
:
3985 case ATA_PROT_NODATA
:
3986 /* check altstatus */
3987 status
= ata_altstatus(ap
);
3988 if (status
& ATA_BUSY
)
3991 /* check main status, clearing INTRQ */
3992 status
= ata_chk_status(ap
);
3993 if (unlikely(status
& ATA_BUSY
))
3995 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
3996 ap
->id
, qc
->tf
.protocol
, status
);
3998 /* ack bmdma irq events */
3999 ap
->ops
->irq_clear(ap
);
4001 /* complete taskfile transaction */
4002 qc
->err_mask
|= ac_err_mask(status
);
4003 ata_qc_complete(qc
);
4010 return 1; /* irq handled */
4013 ap
->stats
.idle_irq
++;
4016 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4018 ata_irq_ack(ap
, 0); /* debug trap */
4019 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4022 return 0; /* irq not handled */
4026 * ata_interrupt - Default ATA host interrupt handler
4027 * @irq: irq line (unused)
4028 * @dev_instance: pointer to our ata_host_set information structure
4031 * Default interrupt handler for PCI IDE devices. Calls
4032 * ata_host_intr() for each port that is not disabled.
4035 * Obtains host_set lock during operation.
4038 * IRQ_NONE or IRQ_HANDLED.
4041 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4043 struct ata_host_set
*host_set
= dev_instance
;
4045 unsigned int handled
= 0;
4046 unsigned long flags
;
4048 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4049 spin_lock_irqsave(&host_set
->lock
, flags
);
4051 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4052 struct ata_port
*ap
;
4054 ap
= host_set
->ports
[i
];
4056 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4057 struct ata_queued_cmd
*qc
;
4059 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4060 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4061 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4062 handled
|= ata_host_intr(ap
, qc
);
4066 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4068 return IRQ_RETVAL(handled
);
4072 * atapi_packet_task - Write CDB bytes to hardware
4073 * @_data: Port to which ATAPI device is attached.
4075 * When device has indicated its readiness to accept
4076 * a CDB, this function is called. Send the CDB.
4077 * If DMA is to be performed, exit immediately.
4078 * Otherwise, we are in polling mode, so poll
4079 * status under operation succeeds or fails.
4082 * Kernel thread context (may sleep)
4085 static void atapi_packet_task(void *_data
)
4087 struct ata_port
*ap
= _data
;
4088 struct ata_queued_cmd
*qc
;
4091 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4093 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4095 /* sleep-wait for BSY to clear */
4096 DPRINTK("busy wait\n");
4097 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4098 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4102 /* make sure DRQ is set */
4103 status
= ata_chk_status(ap
);
4104 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4105 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4110 DPRINTK("send cdb\n");
4111 assert(ap
->cdb_len
>= 12);
4113 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4114 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4115 unsigned long flags
;
4117 /* Once we're done issuing command and kicking bmdma,
4118 * irq handler takes over. To not lose irq, we need
4119 * to clear NOINTR flag before sending cdb, but
4120 * interrupt handler shouldn't be invoked before we're
4121 * finished. Hence, the following locking.
4123 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4124 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4125 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4126 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4127 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4128 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4130 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4132 /* PIO commands are handled by polling */
4133 ap
->hsm_task_state
= HSM_ST
;
4134 queue_work(ata_wq
, &ap
->pio_task
);
4140 ata_poll_qc_complete(qc
);
4145 * ata_port_start - Set port up for dma.
4146 * @ap: Port to initialize
4148 * Called just after data structures for each port are
4149 * initialized. Allocates space for PRD table.
4151 * May be used as the port_start() entry in ata_port_operations.
4154 * Inherited from caller.
4158 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4159 * without filling any other registers
4161 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4164 struct ata_taskfile tf
;
4167 ata_tf_init(ap
, &tf
, dev
->devno
);
4170 tf
.flags
|= ATA_TFLAG_DEVICE
;
4171 tf
.protocol
= ATA_PROT_NODATA
;
4173 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4175 printk(KERN_ERR
"%s: ata command failed: %d\n",
4181 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4185 if (!ata_try_flush_cache(dev
))
4188 if (ata_id_has_flush_ext(dev
->id
))
4189 cmd
= ATA_CMD_FLUSH_EXT
;
4191 cmd
= ATA_CMD_FLUSH
;
4193 return ata_do_simple_cmd(ap
, dev
, cmd
);
4196 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4198 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4201 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4203 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4207 * ata_device_resume - wakeup a previously suspended devices
4209 * Kick the drive back into action, by sending it an idle immediate
4210 * command and making sure its transfer mode matches between drive
4214 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4216 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4217 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4220 if (!ata_dev_present(dev
))
4222 if (dev
->class == ATA_DEV_ATA
)
4223 ata_start_drive(ap
, dev
);
4229 * ata_device_suspend - prepare a device for suspend
4231 * Flush the cache on the drive, if appropriate, then issue a
4232 * standbynow command.
4235 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4237 if (!ata_dev_present(dev
))
4239 if (dev
->class == ATA_DEV_ATA
)
4240 ata_flush_cache(ap
, dev
);
4242 ata_standby_drive(ap
, dev
);
4243 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4247 int ata_port_start (struct ata_port
*ap
)
4249 struct device
*dev
= ap
->host_set
->dev
;
4252 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4256 rc
= ata_pad_alloc(ap
, dev
);
4258 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4262 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4269 * ata_port_stop - Undo ata_port_start()
4270 * @ap: Port to shut down
4272 * Frees the PRD table.
4274 * May be used as the port_stop() entry in ata_port_operations.
4277 * Inherited from caller.
4280 void ata_port_stop (struct ata_port
*ap
)
4282 struct device
*dev
= ap
->host_set
->dev
;
4284 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4285 ata_pad_free(ap
, dev
);
4288 void ata_host_stop (struct ata_host_set
*host_set
)
4290 if (host_set
->mmio_base
)
4291 iounmap(host_set
->mmio_base
);
4296 * ata_host_remove - Unregister SCSI host structure with upper layers
4297 * @ap: Port to unregister
4298 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4301 * Inherited from caller.
4304 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4306 struct Scsi_Host
*sh
= ap
->host
;
4311 scsi_remove_host(sh
);
4313 ap
->ops
->port_stop(ap
);
4317 * ata_host_init - Initialize an ata_port structure
4318 * @ap: Structure to initialize
4319 * @host: associated SCSI mid-layer structure
4320 * @host_set: Collection of hosts to which @ap belongs
4321 * @ent: Probe information provided by low-level driver
4322 * @port_no: Port number associated with this ata_port
4324 * Initialize a new ata_port structure, and its associated
4328 * Inherited from caller.
4331 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4332 struct ata_host_set
*host_set
,
4333 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4339 host
->max_channel
= 1;
4340 host
->unique_id
= ata_unique_id
++;
4341 host
->max_cmd_len
= 12;
4343 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4344 ap
->id
= host
->unique_id
;
4346 ap
->ctl
= ATA_DEVCTL_OBS
;
4347 ap
->host_set
= host_set
;
4348 ap
->port_no
= port_no
;
4350 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4351 ap
->pio_mask
= ent
->pio_mask
;
4352 ap
->mwdma_mask
= ent
->mwdma_mask
;
4353 ap
->udma_mask
= ent
->udma_mask
;
4354 ap
->flags
|= ent
->host_flags
;
4355 ap
->ops
= ent
->port_ops
;
4356 ap
->cbl
= ATA_CBL_NONE
;
4357 ap
->active_tag
= ATA_TAG_POISON
;
4358 ap
->last_ctl
= 0xFF;
4360 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4361 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4363 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4364 ap
->device
[i
].devno
= i
;
4367 ap
->stats
.unhandled_irq
= 1;
4368 ap
->stats
.idle_irq
= 1;
4371 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4375 * ata_host_add - Attach low-level ATA driver to system
4376 * @ent: Information provided by low-level driver
4377 * @host_set: Collections of ports to which we add
4378 * @port_no: Port number associated with this host
4380 * Attach low-level ATA driver to system.
4383 * PCI/etc. bus probe sem.
4386 * New ata_port on success, for NULL on error.
4389 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4390 struct ata_host_set
*host_set
,
4391 unsigned int port_no
)
4393 struct Scsi_Host
*host
;
4394 struct ata_port
*ap
;
4398 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4402 ap
= (struct ata_port
*) &host
->hostdata
[0];
4404 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4406 rc
= ap
->ops
->port_start(ap
);
4413 scsi_host_put(host
);
4418 * ata_device_add - Register hardware device with ATA and SCSI layers
4419 * @ent: Probe information describing hardware device to be registered
4421 * This function processes the information provided in the probe
4422 * information struct @ent, allocates the necessary ATA and SCSI
4423 * host information structures, initializes them, and registers
4424 * everything with requisite kernel subsystems.
4426 * This function requests irqs, probes the ATA bus, and probes
4430 * PCI/etc. bus probe sem.
4433 * Number of ports registered. Zero on error (no ports registered).
4436 int ata_device_add(const struct ata_probe_ent
*ent
)
4438 unsigned int count
= 0, i
;
4439 struct device
*dev
= ent
->dev
;
4440 struct ata_host_set
*host_set
;
4443 /* alloc a container for our list of ATA ports (buses) */
4444 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4445 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4448 spin_lock_init(&host_set
->lock
);
4450 host_set
->dev
= dev
;
4451 host_set
->n_ports
= ent
->n_ports
;
4452 host_set
->irq
= ent
->irq
;
4453 host_set
->mmio_base
= ent
->mmio_base
;
4454 host_set
->private_data
= ent
->private_data
;
4455 host_set
->ops
= ent
->port_ops
;
4457 /* register each port bound to this device */
4458 for (i
= 0; i
< ent
->n_ports
; i
++) {
4459 struct ata_port
*ap
;
4460 unsigned long xfer_mode_mask
;
4462 ap
= ata_host_add(ent
, host_set
, i
);
4466 host_set
->ports
[i
] = ap
;
4467 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4468 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4469 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4471 /* print per-port info to dmesg */
4472 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4473 "bmdma 0x%lX irq %lu\n",
4475 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4476 ata_mode_string(xfer_mode_mask
),
4477 ap
->ioaddr
.cmd_addr
,
4478 ap
->ioaddr
.ctl_addr
,
4479 ap
->ioaddr
.bmdma_addr
,
4483 host_set
->ops
->irq_clear(ap
);
4490 /* obtain irq, that is shared between channels */
4491 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4492 DRV_NAME
, host_set
))
4495 /* perform each probe synchronously */
4496 DPRINTK("probe begin\n");
4497 for (i
= 0; i
< count
; i
++) {
4498 struct ata_port
*ap
;
4501 ap
= host_set
->ports
[i
];
4503 DPRINTK("ata%u: probe begin\n", ap
->id
);
4504 rc
= ata_bus_probe(ap
);
4505 DPRINTK("ata%u: probe end\n", ap
->id
);
4508 /* FIXME: do something useful here?
4509 * Current libata behavior will
4510 * tear down everything when
4511 * the module is removed
4512 * or the h/w is unplugged.
4516 rc
= scsi_add_host(ap
->host
, dev
);
4518 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4520 /* FIXME: do something useful here */
4521 /* FIXME: handle unconditional calls to
4522 * scsi_scan_host and ata_host_remove, below,
4528 /* probes are done, now scan each port's disk(s) */
4529 DPRINTK("probe begin\n");
4530 for (i
= 0; i
< count
; i
++) {
4531 struct ata_port
*ap
= host_set
->ports
[i
];
4533 ata_scsi_scan_host(ap
);
4536 dev_set_drvdata(dev
, host_set
);
4538 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4539 return ent
->n_ports
; /* success */
4542 for (i
= 0; i
< count
; i
++) {
4543 ata_host_remove(host_set
->ports
[i
], 1);
4544 scsi_host_put(host_set
->ports
[i
]->host
);
4548 VPRINTK("EXIT, returning 0\n");
4553 * ata_host_set_remove - PCI layer callback for device removal
4554 * @host_set: ATA host set that was removed
4556 * Unregister all objects associated with this host set. Free those
4560 * Inherited from calling layer (may sleep).
4563 void ata_host_set_remove(struct ata_host_set
*host_set
)
4565 struct ata_port
*ap
;
4568 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4569 ap
= host_set
->ports
[i
];
4570 scsi_remove_host(ap
->host
);
4573 free_irq(host_set
->irq
, host_set
);
4575 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4576 ap
= host_set
->ports
[i
];
4578 ata_scsi_release(ap
->host
);
4580 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4581 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4583 if (ioaddr
->cmd_addr
== 0x1f0)
4584 release_region(0x1f0, 8);
4585 else if (ioaddr
->cmd_addr
== 0x170)
4586 release_region(0x170, 8);
4589 scsi_host_put(ap
->host
);
4592 if (host_set
->ops
->host_stop
)
4593 host_set
->ops
->host_stop(host_set
);
4599 * ata_scsi_release - SCSI layer callback hook for host unload
4600 * @host: libata host to be unloaded
4602 * Performs all duties necessary to shut down a libata port...
4603 * Kill port kthread, disable port, and release resources.
4606 * Inherited from SCSI layer.
4612 int ata_scsi_release(struct Scsi_Host
*host
)
4614 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4618 ap
->ops
->port_disable(ap
);
4619 ata_host_remove(ap
, 0);
4626 * ata_std_ports - initialize ioaddr with standard port offsets.
4627 * @ioaddr: IO address structure to be initialized
4629 * Utility function which initializes data_addr, error_addr,
4630 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4631 * device_addr, status_addr, and command_addr to standard offsets
4632 * relative to cmd_addr.
4634 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4637 void ata_std_ports(struct ata_ioports
*ioaddr
)
4639 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4640 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4641 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4642 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4643 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4644 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4645 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4646 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4647 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4648 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4651 static struct ata_probe_ent
*
4652 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
4654 struct ata_probe_ent
*probe_ent
;
4656 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4658 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4659 kobject_name(&(dev
->kobj
)));
4663 INIT_LIST_HEAD(&probe_ent
->node
);
4664 probe_ent
->dev
= dev
;
4666 probe_ent
->sht
= port
->sht
;
4667 probe_ent
->host_flags
= port
->host_flags
;
4668 probe_ent
->pio_mask
= port
->pio_mask
;
4669 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4670 probe_ent
->udma_mask
= port
->udma_mask
;
4671 probe_ent
->port_ops
= port
->port_ops
;
4680 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4682 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4684 pci_iounmap(pdev
, host_set
->mmio_base
);
4688 * ata_pci_init_native_mode - Initialize native-mode driver
4689 * @pdev: pci device to be initialized
4690 * @port: array[2] of pointers to port info structures.
4691 * @ports: bitmap of ports present
4693 * Utility function which allocates and initializes an
4694 * ata_probe_ent structure for a standard dual-port
4695 * PIO-based IDE controller. The returned ata_probe_ent
4696 * structure can be passed to ata_device_add(). The returned
4697 * ata_probe_ent structure should then be freed with kfree().
4699 * The caller need only pass the address of the primary port, the
4700 * secondary will be deduced automatically. If the device has non
4701 * standard secondary port mappings this function can be called twice,
4702 * once for each interface.
4705 struct ata_probe_ent
*
4706 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
4708 struct ata_probe_ent
*probe_ent
=
4709 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4715 probe_ent
->irq
= pdev
->irq
;
4716 probe_ent
->irq_flags
= SA_SHIRQ
;
4717 probe_ent
->private_data
= port
[0]->private_data
;
4719 if (ports
& ATA_PORT_PRIMARY
) {
4720 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
4721 probe_ent
->port
[p
].altstatus_addr
=
4722 probe_ent
->port
[p
].ctl_addr
=
4723 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4724 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
4725 ata_std_ports(&probe_ent
->port
[p
]);
4729 if (ports
& ATA_PORT_SECONDARY
) {
4730 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
4731 probe_ent
->port
[p
].altstatus_addr
=
4732 probe_ent
->port
[p
].ctl_addr
=
4733 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4734 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4735 ata_std_ports(&probe_ent
->port
[p
]);
4739 probe_ent
->n_ports
= p
;
4743 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
4745 struct ata_probe_ent
*probe_ent
;
4747 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
4751 probe_ent
->legacy_mode
= 1;
4752 probe_ent
->n_ports
= 1;
4753 probe_ent
->hard_port_no
= port_num
;
4754 probe_ent
->private_data
= port
->private_data
;
4759 probe_ent
->irq
= 14;
4760 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4761 probe_ent
->port
[0].altstatus_addr
=
4762 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4765 probe_ent
->irq
= 15;
4766 probe_ent
->port
[0].cmd_addr
= 0x170;
4767 probe_ent
->port
[0].altstatus_addr
=
4768 probe_ent
->port
[0].ctl_addr
= 0x376;
4771 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
4772 ata_std_ports(&probe_ent
->port
[0]);
4777 * ata_pci_init_one - Initialize/register PCI IDE host controller
4778 * @pdev: Controller to be initialized
4779 * @port_info: Information from low-level host driver
4780 * @n_ports: Number of ports attached to host controller
4782 * This is a helper function which can be called from a driver's
4783 * xxx_init_one() probe function if the hardware uses traditional
4784 * IDE taskfile registers.
4786 * This function calls pci_enable_device(), reserves its register
4787 * regions, sets the dma mask, enables bus master mode, and calls
4791 * Inherited from PCI layer (may sleep).
4794 * Zero on success, negative on errno-based value on error.
4797 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4798 unsigned int n_ports
)
4800 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
4801 struct ata_port_info
*port
[2];
4803 unsigned int legacy_mode
= 0;
4804 int disable_dev_on_err
= 1;
4809 port
[0] = port_info
[0];
4811 port
[1] = port_info
[1];
4815 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4816 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4817 /* TODO: What if one channel is in native mode ... */
4818 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4819 mask
= (1 << 2) | (1 << 0);
4820 if ((tmp8
& mask
) != mask
)
4821 legacy_mode
= (1 << 3);
4825 if ((!legacy_mode
) && (n_ports
> 2)) {
4826 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
4831 /* FIXME: Really for ATA it isn't safe because the device may be
4832 multi-purpose and we want to leave it alone if it was already
4833 enabled. Secondly for shared use as Arjan says we want refcounting
4835 Checking dev->is_enabled is insufficient as this is not set at
4836 boot for the primary video which is BIOS enabled
4839 rc
= pci_enable_device(pdev
);
4843 rc
= pci_request_regions(pdev
, DRV_NAME
);
4845 disable_dev_on_err
= 0;
4849 /* FIXME: Should use platform specific mappers for legacy port ranges */
4851 if (!request_region(0x1f0, 8, "libata")) {
4852 struct resource
*conflict
, res
;
4854 res
.end
= 0x1f0 + 8 - 1;
4855 conflict
= ____request_resource(&ioport_resource
, &res
);
4856 if (!strcmp(conflict
->name
, "libata"))
4857 legacy_mode
|= (1 << 0);
4859 disable_dev_on_err
= 0;
4860 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4863 legacy_mode
|= (1 << 0);
4865 if (!request_region(0x170, 8, "libata")) {
4866 struct resource
*conflict
, res
;
4868 res
.end
= 0x170 + 8 - 1;
4869 conflict
= ____request_resource(&ioport_resource
, &res
);
4870 if (!strcmp(conflict
->name
, "libata"))
4871 legacy_mode
|= (1 << 1);
4873 disable_dev_on_err
= 0;
4874 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4877 legacy_mode
|= (1 << 1);
4880 /* we have legacy mode, but all ports are unavailable */
4881 if (legacy_mode
== (1 << 3)) {
4883 goto err_out_regions
;
4886 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4888 goto err_out_regions
;
4889 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4891 goto err_out_regions
;
4894 if (legacy_mode
& (1 << 0))
4895 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
4896 if (legacy_mode
& (1 << 1))
4897 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
4900 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
4902 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
4904 if (!probe_ent
&& !probe_ent2
) {
4906 goto err_out_regions
;
4909 pci_set_master(pdev
);
4911 /* FIXME: check ata_device_add return */
4913 if (legacy_mode
& (1 << 0))
4914 ata_device_add(probe_ent
);
4915 if (legacy_mode
& (1 << 1))
4916 ata_device_add(probe_ent2
);
4918 ata_device_add(probe_ent
);
4926 if (legacy_mode
& (1 << 0))
4927 release_region(0x1f0, 8);
4928 if (legacy_mode
& (1 << 1))
4929 release_region(0x170, 8);
4930 pci_release_regions(pdev
);
4932 if (disable_dev_on_err
)
4933 pci_disable_device(pdev
);
4938 * ata_pci_remove_one - PCI layer callback for device removal
4939 * @pdev: PCI device that was removed
4941 * PCI layer indicates to libata via this hook that
4942 * hot-unplug or module unload event has occurred.
4943 * Handle this by unregistering all objects associated
4944 * with this PCI device. Free those objects. Then finally
4945 * release PCI resources and disable device.
4948 * Inherited from PCI layer (may sleep).
4951 void ata_pci_remove_one (struct pci_dev
*pdev
)
4953 struct device
*dev
= pci_dev_to_dev(pdev
);
4954 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4956 ata_host_set_remove(host_set
);
4957 pci_release_regions(pdev
);
4958 pci_disable_device(pdev
);
4959 dev_set_drvdata(dev
, NULL
);
4962 /* move to PCI subsystem */
4963 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4965 unsigned long tmp
= 0;
4967 switch (bits
->width
) {
4970 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4976 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4982 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4993 return (tmp
== bits
->val
) ? 1 : 0;
4996 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4998 pci_save_state(pdev
);
4999 pci_disable_device(pdev
);
5000 pci_set_power_state(pdev
, PCI_D3hot
);
5004 int ata_pci_device_resume(struct pci_dev
*pdev
)
5006 pci_set_power_state(pdev
, PCI_D0
);
5007 pci_restore_state(pdev
);
5008 pci_enable_device(pdev
);
5009 pci_set_master(pdev
);
5012 #endif /* CONFIG_PCI */
5015 static int __init
ata_init(void)
5017 ata_wq
= create_workqueue("ata");
5021 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5025 static void __exit
ata_exit(void)
5027 destroy_workqueue(ata_wq
);
5030 module_init(ata_init
);
5031 module_exit(ata_exit
);
5033 static unsigned long ratelimit_time
;
5034 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5036 int ata_ratelimit(void)
5039 unsigned long flags
;
5041 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5043 if (time_after(jiffies
, ratelimit_time
)) {
5045 ratelimit_time
= jiffies
+ (HZ
/5);
5049 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5055 * libata is essentially a library of internal helper functions for
5056 * low-level ATA host controller drivers. As such, the API/ABI is
5057 * likely to change as new drivers are added and updated.
5058 * Do not depend on ABI/API stability.
5061 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5062 EXPORT_SYMBOL_GPL(ata_std_ports
);
5063 EXPORT_SYMBOL_GPL(ata_device_add
);
5064 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5065 EXPORT_SYMBOL_GPL(ata_sg_init
);
5066 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5067 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5068 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5069 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5070 EXPORT_SYMBOL_GPL(ata_tf_load
);
5071 EXPORT_SYMBOL_GPL(ata_tf_read
);
5072 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5073 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5074 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5075 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5076 EXPORT_SYMBOL_GPL(ata_check_status
);
5077 EXPORT_SYMBOL_GPL(ata_altstatus
);
5078 EXPORT_SYMBOL_GPL(ata_exec_command
);
5079 EXPORT_SYMBOL_GPL(ata_port_start
);
5080 EXPORT_SYMBOL_GPL(ata_port_stop
);
5081 EXPORT_SYMBOL_GPL(ata_host_stop
);
5082 EXPORT_SYMBOL_GPL(ata_interrupt
);
5083 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5084 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5085 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5086 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5087 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5088 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5089 EXPORT_SYMBOL_GPL(ata_port_probe
);
5090 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5091 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5092 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5093 EXPORT_SYMBOL_GPL(ata_port_disable
);
5094 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5095 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5096 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5097 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5098 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5099 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5100 EXPORT_SYMBOL_GPL(ata_host_intr
);
5101 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5102 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5103 EXPORT_SYMBOL_GPL(ata_dev_config
);
5104 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5106 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5107 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5110 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5111 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5112 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5113 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5114 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5115 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5116 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5117 #endif /* CONFIG_PCI */
5119 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5120 EXPORT_SYMBOL_GPL(ata_device_resume
);
5121 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5122 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);