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_WRITE_MULTI_FUA_EXT
,
572 ATA_CMD_PIO_READ_EXT
,
573 ATA_CMD_PIO_WRITE_EXT
,
586 ATA_CMD_WRITE_FUA_EXT
590 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
591 * @qc: command to examine and configure
593 * Examine the device configuration and tf->flags to calculate
594 * the proper read/write commands and protocol to use.
599 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
601 struct ata_taskfile
*tf
= &qc
->tf
;
602 struct ata_device
*dev
= qc
->dev
;
605 int index
, fua
, lba48
, write
;
607 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
608 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
609 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
611 if (dev
->flags
& ATA_DFLAG_PIO
) {
612 tf
->protocol
= ATA_PROT_PIO
;
613 index
= dev
->multi_count
? 0 : 8;
614 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
615 /* Unable to use DMA due to host limitation */
616 tf
->protocol
= ATA_PROT_PIO
;
617 index
= dev
->multi_count
? 0 : 4;
619 tf
->protocol
= ATA_PROT_DMA
;
623 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
631 static const char * const xfer_mode_str
[] = {
651 * ata_udma_string - convert UDMA bit offset to string
652 * @mask: mask of bits supported; only highest bit counts.
654 * Determine string which represents the highest speed
655 * (highest bit in @udma_mask).
661 * Constant C string representing highest speed listed in
662 * @udma_mask, or the constant C string "<n/a>".
665 static const char *ata_mode_string(unsigned int mask
)
669 for (i
= 7; i
>= 0; i
--)
672 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
675 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
682 return xfer_mode_str
[i
];
686 * ata_pio_devchk - PATA device presence detection
687 * @ap: ATA channel to examine
688 * @device: Device to examine (starting at zero)
690 * This technique was originally described in
691 * Hale Landis's ATADRVR (www.ata-atapi.com), and
692 * later found its way into the ATA/ATAPI spec.
694 * Write a pattern to the ATA shadow registers,
695 * and if a device is present, it will respond by
696 * correctly storing and echoing back the
697 * ATA shadow register contents.
703 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
706 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
709 ap
->ops
->dev_select(ap
, device
);
711 outb(0x55, ioaddr
->nsect_addr
);
712 outb(0xaa, ioaddr
->lbal_addr
);
714 outb(0xaa, ioaddr
->nsect_addr
);
715 outb(0x55, ioaddr
->lbal_addr
);
717 outb(0x55, ioaddr
->nsect_addr
);
718 outb(0xaa, ioaddr
->lbal_addr
);
720 nsect
= inb(ioaddr
->nsect_addr
);
721 lbal
= inb(ioaddr
->lbal_addr
);
723 if ((nsect
== 0x55) && (lbal
== 0xaa))
724 return 1; /* we found a device */
726 return 0; /* nothing found */
730 * ata_mmio_devchk - PATA device presence detection
731 * @ap: ATA channel to examine
732 * @device: Device to examine (starting at zero)
734 * This technique was originally described in
735 * Hale Landis's ATADRVR (www.ata-atapi.com), and
736 * later found its way into the ATA/ATAPI spec.
738 * Write a pattern to the ATA shadow registers,
739 * and if a device is present, it will respond by
740 * correctly storing and echoing back the
741 * ATA shadow register contents.
747 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
750 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
753 ap
->ops
->dev_select(ap
, device
);
755 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
756 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
758 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
759 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
761 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
762 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
764 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
765 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
767 if ((nsect
== 0x55) && (lbal
== 0xaa))
768 return 1; /* we found a device */
770 return 0; /* nothing found */
774 * ata_devchk - PATA device presence detection
775 * @ap: ATA channel to examine
776 * @device: Device to examine (starting at zero)
778 * Dispatch ATA device presence detection, depending
779 * on whether we are using PIO or MMIO to talk to the
780 * ATA shadow registers.
786 static unsigned int ata_devchk(struct ata_port
*ap
,
789 if (ap
->flags
& ATA_FLAG_MMIO
)
790 return ata_mmio_devchk(ap
, device
);
791 return ata_pio_devchk(ap
, device
);
795 * ata_dev_classify - determine device type based on ATA-spec signature
796 * @tf: ATA taskfile register set for device to be identified
798 * Determine from taskfile register contents whether a device is
799 * ATA or ATAPI, as per "Signature and persistence" section
800 * of ATA/PI spec (volume 1, sect 5.14).
806 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
807 * the event of failure.
810 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
812 /* Apple's open source Darwin code hints that some devices only
813 * put a proper signature into the LBA mid/high registers,
814 * So, we only check those. It's sufficient for uniqueness.
817 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
818 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
819 DPRINTK("found ATA device by sig\n");
823 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
824 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
825 DPRINTK("found ATAPI device by sig\n");
826 return ATA_DEV_ATAPI
;
829 DPRINTK("unknown device\n");
830 return ATA_DEV_UNKNOWN
;
834 * ata_dev_try_classify - Parse returned ATA device signature
835 * @ap: ATA channel to examine
836 * @device: Device to examine (starting at zero)
838 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
839 * an ATA/ATAPI-defined set of values is placed in the ATA
840 * shadow registers, indicating the results of device detection
843 * Select the ATA device, and read the values from the ATA shadow
844 * registers. Then parse according to the Error register value,
845 * and the spec-defined values examined by ata_dev_classify().
851 static u8
ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
)
853 struct ata_device
*dev
= &ap
->device
[device
];
854 struct ata_taskfile tf
;
858 ap
->ops
->dev_select(ap
, device
);
860 memset(&tf
, 0, sizeof(tf
));
862 ap
->ops
->tf_read(ap
, &tf
);
865 dev
->class = ATA_DEV_NONE
;
867 /* see if device passed diags */
870 else if ((device
== 0) && (err
== 0x81))
875 /* determine if device if ATA or ATAPI */
876 class = ata_dev_classify(&tf
);
877 if (class == ATA_DEV_UNKNOWN
)
879 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
888 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
889 * @id: IDENTIFY DEVICE results we will examine
890 * @s: string into which data is output
891 * @ofs: offset into identify device page
892 * @len: length of string to return. must be an even number.
894 * The strings in the IDENTIFY DEVICE page are broken up into
895 * 16-bit chunks. Run through the string, and output each
896 * 8-bit chunk linearly, regardless of platform.
902 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
903 unsigned int ofs
, unsigned int len
)
923 * ata_noop_dev_select - Select device 0/1 on ATA bus
924 * @ap: ATA channel to manipulate
925 * @device: ATA device (numbered from zero) to select
927 * This function performs no actual function.
929 * May be used as the dev_select() entry in ata_port_operations.
934 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
940 * ata_std_dev_select - Select device 0/1 on ATA bus
941 * @ap: ATA channel to manipulate
942 * @device: ATA device (numbered from zero) to select
944 * Use the method defined in the ATA specification to
945 * make either device 0, or device 1, active on the
946 * ATA channel. Works with both PIO and MMIO.
948 * May be used as the dev_select() entry in ata_port_operations.
954 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
959 tmp
= ATA_DEVICE_OBS
;
961 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
963 if (ap
->flags
& ATA_FLAG_MMIO
) {
964 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
966 outb(tmp
, ap
->ioaddr
.device_addr
);
968 ata_pause(ap
); /* needed; also flushes, for mmio */
972 * ata_dev_select - Select device 0/1 on ATA bus
973 * @ap: ATA channel to manipulate
974 * @device: ATA device (numbered from zero) to select
975 * @wait: non-zero to wait for Status register BSY bit to clear
976 * @can_sleep: non-zero if context allows sleeping
978 * Use the method defined in the ATA specification to
979 * make either device 0, or device 1, active on the
982 * This is a high-level version of ata_std_dev_select(),
983 * which additionally provides the services of inserting
984 * the proper pauses and status polling, where needed.
990 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
991 unsigned int wait
, unsigned int can_sleep
)
993 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
994 ap
->id
, device
, wait
);
999 ap
->ops
->dev_select(ap
, device
);
1002 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
1009 * ata_dump_id - IDENTIFY DEVICE info debugging output
1010 * @dev: Device whose IDENTIFY DEVICE page we will dump
1012 * Dump selected 16-bit words from a detected device's
1013 * IDENTIFY PAGE page.
1019 static inline void ata_dump_id(const struct ata_device
*dev
)
1021 DPRINTK("49==0x%04x "
1031 DPRINTK("80==0x%04x "
1041 DPRINTK("88==0x%04x "
1048 * Compute the PIO modes available for this device. This is not as
1049 * trivial as it seems if we must consider early devices correctly.
1051 * FIXME: pre IDE drive timing (do we care ?).
1054 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
1058 /* Usual case. Word 53 indicates word 64 is valid */
1059 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
1060 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
1066 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
1067 number for the maximum. Turn it into a mask and return it */
1068 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
1070 /* But wait.. there's more. Design your standards by committee and
1071 you too can get a free iordy field to process. However its the
1072 speeds not the modes that are supported... Note drivers using the
1073 timing API will get this right anyway */
1076 struct ata_exec_internal_arg
{
1077 unsigned int err_mask
;
1078 struct ata_taskfile
*tf
;
1079 struct completion
*waiting
;
1082 int ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
1084 struct ata_exec_internal_arg
*arg
= qc
->private_data
;
1085 struct completion
*waiting
= arg
->waiting
;
1087 if (!(qc
->err_mask
& ~AC_ERR_DEV
))
1088 qc
->ap
->ops
->tf_read(qc
->ap
, arg
->tf
);
1089 arg
->err_mask
= qc
->err_mask
;
1090 arg
->waiting
= NULL
;
1097 * ata_exec_internal - execute libata internal command
1098 * @ap: Port to which the command is sent
1099 * @dev: Device to which the command is sent
1100 * @tf: Taskfile registers for the command and the result
1101 * @dma_dir: Data tranfer direction of the command
1102 * @buf: Data buffer of the command
1103 * @buflen: Length of data buffer
1105 * Executes libata internal command with timeout. @tf contains
1106 * command on entry and result on return. Timeout and error
1107 * conditions are reported via return value. No recovery action
1108 * is taken after a command times out. It's caller's duty to
1109 * clean up after timeout.
1112 * None. Should be called with kernel context, might sleep.
1116 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
1117 struct ata_taskfile
*tf
,
1118 int dma_dir
, void *buf
, unsigned int buflen
)
1120 u8 command
= tf
->command
;
1121 struct ata_queued_cmd
*qc
;
1122 DECLARE_COMPLETION(wait
);
1123 unsigned long flags
;
1124 struct ata_exec_internal_arg arg
;
1126 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1128 qc
= ata_qc_new_init(ap
, dev
);
1132 qc
->dma_dir
= dma_dir
;
1133 if (dma_dir
!= DMA_NONE
) {
1134 ata_sg_init_one(qc
, buf
, buflen
);
1135 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1138 arg
.waiting
= &wait
;
1140 qc
->private_data
= &arg
;
1141 qc
->complete_fn
= ata_qc_complete_internal
;
1143 if (ata_qc_issue(qc
))
1146 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1148 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1149 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1151 /* We're racing with irq here. If we lose, the
1152 * following test prevents us from completing the qc
1153 * again. If completion irq occurs after here but
1154 * before the caller cleans up, it will result in a
1155 * spurious interrupt. We can live with that.
1158 qc
->err_mask
= AC_ERR_OTHER
;
1159 ata_qc_complete(qc
);
1160 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1164 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1167 return arg
.err_mask
;
1171 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1172 return AC_ERR_OTHER
;
1176 * ata_pio_need_iordy - check if iordy needed
1179 * Check if the current speed of the device requires IORDY. Used
1180 * by various controllers for chip configuration.
1183 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1186 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1193 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1195 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1196 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1197 /* Is the speed faster than the drive allows non IORDY ? */
1199 /* This is cycle times not frequency - watch the logic! */
1200 if (pio
> 240) /* PIO2 is 240nS per cycle */
1209 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1210 * @ap: port on which device we wish to probe resides
1211 * @device: device bus address, starting at zero
1213 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1214 * command, and read back the 512-byte device information page.
1215 * The device information page is fed to us via the standard
1216 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1217 * using standard PIO-IN paths)
1219 * After reading the device information page, we use several
1220 * bits of information from it to initialize data structures
1221 * that will be used during the lifetime of the ata_device.
1222 * Other data from the info page is used to disqualify certain
1223 * older ATA devices we do not wish to support.
1226 * Inherited from caller. Some functions called by this function
1227 * obtain the host_set lock.
1230 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1232 struct ata_device
*dev
= &ap
->device
[device
];
1233 unsigned int major_version
;
1235 unsigned long xfer_modes
;
1236 unsigned int using_edd
;
1237 struct ata_taskfile tf
;
1238 unsigned int err_mask
;
1241 if (!ata_dev_present(dev
)) {
1242 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1247 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1252 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1254 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1255 dev
->class == ATA_DEV_NONE
);
1257 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1260 ata_tf_init(ap
, &tf
, device
);
1262 if (dev
->class == ATA_DEV_ATA
) {
1263 tf
.command
= ATA_CMD_ID_ATA
;
1264 DPRINTK("do ATA identify\n");
1266 tf
.command
= ATA_CMD_ID_ATAPI
;
1267 DPRINTK("do ATAPI identify\n");
1270 tf
.protocol
= ATA_PROT_PIO
;
1272 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1273 dev
->id
, sizeof(dev
->id
));
1276 if (err_mask
& ~AC_ERR_DEV
)
1280 * arg! EDD works for all test cases, but seems to return
1281 * the ATA signature for some ATAPI devices. Until the
1282 * reason for this is found and fixed, we fix up the mess
1283 * here. If IDENTIFY DEVICE returns command aborted
1284 * (as ATAPI devices do), then we issue an
1285 * IDENTIFY PACKET DEVICE.
1287 * ATA software reset (SRST, the default) does not appear
1288 * to have this problem.
1290 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1291 u8 err
= tf
.feature
;
1292 if (err
& ATA_ABORTED
) {
1293 dev
->class = ATA_DEV_ATAPI
;
1300 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1302 /* print device capabilities */
1303 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1304 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1305 ap
->id
, device
, dev
->id
[49],
1306 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1307 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1311 * common ATA, ATAPI feature tests
1314 /* we require DMA support (bits 8 of word 49) */
1315 if (!ata_id_has_dma(dev
->id
)) {
1316 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1320 /* quick-n-dirty find max transfer mode; for printk only */
1321 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1323 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1325 xfer_modes
= ata_pio_modes(dev
);
1329 /* ATA-specific feature tests */
1330 if (dev
->class == ATA_DEV_ATA
) {
1331 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1334 /* get major version */
1335 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1336 for (major_version
= 14; major_version
>= 1; major_version
--)
1337 if (tmp
& (1 << major_version
))
1341 * The exact sequence expected by certain pre-ATA4 drives is:
1344 * INITIALIZE DEVICE PARAMETERS
1346 * Some drives were very specific about that exact sequence.
1348 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1349 ata_dev_init_params(ap
, dev
);
1351 /* current CHS translation info (id[53-58]) might be
1352 * changed. reread the identify device info.
1354 ata_dev_reread_id(ap
, dev
);
1357 if (ata_id_has_lba(dev
->id
)) {
1358 dev
->flags
|= ATA_DFLAG_LBA
;
1360 if (ata_id_has_lba48(dev
->id
)) {
1361 dev
->flags
|= ATA_DFLAG_LBA48
;
1362 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1364 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1367 /* print device info to dmesg */
1368 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1371 ata_mode_string(xfer_modes
),
1372 (unsigned long long)dev
->n_sectors
,
1373 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1377 /* Default translation */
1378 dev
->cylinders
= dev
->id
[1];
1379 dev
->heads
= dev
->id
[3];
1380 dev
->sectors
= dev
->id
[6];
1381 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1383 if (ata_id_current_chs_valid(dev
->id
)) {
1384 /* Current CHS translation is valid. */
1385 dev
->cylinders
= dev
->id
[54];
1386 dev
->heads
= dev
->id
[55];
1387 dev
->sectors
= dev
->id
[56];
1389 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1392 /* print device info to dmesg */
1393 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1396 ata_mode_string(xfer_modes
),
1397 (unsigned long long)dev
->n_sectors
,
1398 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1402 ap
->host
->max_cmd_len
= 16;
1405 /* ATAPI-specific feature tests */
1406 else if (dev
->class == ATA_DEV_ATAPI
) {
1407 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1410 rc
= atapi_cdb_len(dev
->id
);
1411 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1412 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1415 ap
->cdb_len
= (unsigned int) rc
;
1416 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1418 /* print device info to dmesg */
1419 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1421 ata_mode_string(xfer_modes
));
1424 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1428 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1431 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1432 DPRINTK("EXIT, err\n");
1436 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1438 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1442 * ata_dev_config - Run device specific handlers and check for
1443 * SATA->PATA bridges
1450 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1452 /* limit bridge transfers to udma5, 200 sectors */
1453 if (ata_dev_knobble(ap
)) {
1454 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1455 ap
->id
, ap
->device
->devno
);
1456 ap
->udma_mask
&= ATA_UDMA5
;
1457 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1458 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1459 ap
->device
[i
].flags
|= ATA_DFLAG_LOCK_SECTORS
;
1462 if (ap
->ops
->dev_config
)
1463 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1467 * ata_bus_probe - Reset and probe ATA bus
1470 * Master ATA bus probing function. Initiates a hardware-dependent
1471 * bus reset, then attempts to identify any devices found on
1475 * PCI/etc. bus probe sem.
1478 * Zero on success, non-zero on error.
1481 static int ata_bus_probe(struct ata_port
*ap
)
1483 unsigned int i
, found
= 0;
1485 ap
->ops
->phy_reset(ap
);
1486 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1489 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1490 ata_dev_identify(ap
, i
);
1491 if (ata_dev_present(&ap
->device
[i
])) {
1493 ata_dev_config(ap
,i
);
1497 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1498 goto err_out_disable
;
1501 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1502 goto err_out_disable
;
1507 ap
->ops
->port_disable(ap
);
1513 * ata_port_probe - Mark port as enabled
1514 * @ap: Port for which we indicate enablement
1516 * Modify @ap data structure such that the system
1517 * thinks that the entire port is enabled.
1519 * LOCKING: host_set lock, or some other form of
1523 void ata_port_probe(struct ata_port
*ap
)
1525 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1529 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1530 * @ap: SATA port associated with target SATA PHY.
1532 * This function issues commands to standard SATA Sxxx
1533 * PHY registers, to wake up the phy (and device), and
1534 * clear any reset condition.
1537 * PCI/etc. bus probe sem.
1540 void __sata_phy_reset(struct ata_port
*ap
)
1543 unsigned long timeout
= jiffies
+ (HZ
* 5);
1545 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1546 /* issue phy wake/reset */
1547 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1548 /* Couldn't find anything in SATA I/II specs, but
1549 * AHCI-1.1 10.4.2 says at least 1 ms. */
1552 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1554 /* wait for phy to become ready, if necessary */
1557 sstatus
= scr_read(ap
, SCR_STATUS
);
1558 if ((sstatus
& 0xf) != 1)
1560 } while (time_before(jiffies
, timeout
));
1562 /* TODO: phy layer with polling, timeouts, etc. */
1563 sstatus
= scr_read(ap
, SCR_STATUS
);
1564 if (sata_dev_present(ap
)) {
1568 tmp
= (sstatus
>> 4) & 0xf;
1571 else if (tmp
& (1 << 1))
1574 speed
= "<unknown>";
1575 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1576 ap
->id
, speed
, sstatus
);
1579 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1581 ata_port_disable(ap
);
1584 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1587 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1588 ata_port_disable(ap
);
1592 ap
->cbl
= ATA_CBL_SATA
;
1596 * sata_phy_reset - Reset SATA bus.
1597 * @ap: SATA port associated with target SATA PHY.
1599 * This function resets the SATA bus, and then probes
1600 * the bus for devices.
1603 * PCI/etc. bus probe sem.
1606 void sata_phy_reset(struct ata_port
*ap
)
1608 __sata_phy_reset(ap
);
1609 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1615 * ata_port_disable - Disable port.
1616 * @ap: Port to be disabled.
1618 * Modify @ap data structure such that the system
1619 * thinks that the entire port is disabled, and should
1620 * never attempt to probe or communicate with devices
1623 * LOCKING: host_set lock, or some other form of
1627 void ata_port_disable(struct ata_port
*ap
)
1629 ap
->device
[0].class = ATA_DEV_NONE
;
1630 ap
->device
[1].class = ATA_DEV_NONE
;
1631 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1635 * This mode timing computation functionality is ported over from
1636 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1639 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1640 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1641 * for PIO 5, which is a nonstandard extension and UDMA6, which
1642 * is currently supported only by Maxtor drives.
1645 static const struct ata_timing ata_timing
[] = {
1647 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1648 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1649 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1650 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1652 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1653 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1654 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1656 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1658 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1659 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1660 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1662 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1663 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1664 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1666 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1667 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1668 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1670 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1671 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1672 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1674 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1679 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1680 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1682 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1684 q
->setup
= EZ(t
->setup
* 1000, T
);
1685 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1686 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1687 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1688 q
->active
= EZ(t
->active
* 1000, T
);
1689 q
->recover
= EZ(t
->recover
* 1000, T
);
1690 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1691 q
->udma
= EZ(t
->udma
* 1000, UT
);
1694 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1695 struct ata_timing
*m
, unsigned int what
)
1697 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1698 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1699 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1700 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1701 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1702 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1703 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1704 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1707 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1709 const struct ata_timing
*t
;
1711 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1712 if (t
->mode
== 0xFF)
1717 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1718 struct ata_timing
*t
, int T
, int UT
)
1720 const struct ata_timing
*s
;
1721 struct ata_timing p
;
1727 if (!(s
= ata_timing_find_mode(speed
)))
1730 memcpy(t
, s
, sizeof(*s
));
1733 * If the drive is an EIDE drive, it can tell us it needs extended
1734 * PIO/MW_DMA cycle timing.
1737 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1738 memset(&p
, 0, sizeof(p
));
1739 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1740 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1741 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1742 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1743 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1745 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1749 * Convert the timing to bus clock counts.
1752 ata_timing_quantize(t
, t
, T
, UT
);
1755 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
1756 * and some other commands. We have to ensure that the DMA cycle timing is
1757 * slower/equal than the fastest PIO timing.
1760 if (speed
> XFER_PIO_4
) {
1761 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1762 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1766 * Lenghten active & recovery time so that cycle time is correct.
1769 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1770 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1771 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1774 if (t
->active
+ t
->recover
< t
->cycle
) {
1775 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1776 t
->recover
= t
->cycle
- t
->active
;
1782 static const struct {
1785 } xfer_mode_classes
[] = {
1786 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1787 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1788 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1791 static u8
base_from_shift(unsigned int shift
)
1795 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1796 if (xfer_mode_classes
[i
].shift
== shift
)
1797 return xfer_mode_classes
[i
].base
;
1802 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1807 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1810 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1811 dev
->flags
|= ATA_DFLAG_PIO
;
1813 ata_dev_set_xfermode(ap
, dev
);
1815 base
= base_from_shift(dev
->xfer_shift
);
1816 ofs
= dev
->xfer_mode
- base
;
1817 idx
= ofs
+ dev
->xfer_shift
;
1818 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1820 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1821 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1823 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1824 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1827 static int ata_host_set_pio(struct ata_port
*ap
)
1833 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1836 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1840 base
= base_from_shift(ATA_SHIFT_PIO
);
1841 xfer_mode
= base
+ x
;
1843 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1844 (int)base
, (int)xfer_mode
, mask
, x
);
1846 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1847 struct ata_device
*dev
= &ap
->device
[i
];
1848 if (ata_dev_present(dev
)) {
1849 dev
->pio_mode
= xfer_mode
;
1850 dev
->xfer_mode
= xfer_mode
;
1851 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1852 if (ap
->ops
->set_piomode
)
1853 ap
->ops
->set_piomode(ap
, dev
);
1860 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1861 unsigned int xfer_shift
)
1865 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1866 struct ata_device
*dev
= &ap
->device
[i
];
1867 if (ata_dev_present(dev
)) {
1868 dev
->dma_mode
= xfer_mode
;
1869 dev
->xfer_mode
= xfer_mode
;
1870 dev
->xfer_shift
= xfer_shift
;
1871 if (ap
->ops
->set_dmamode
)
1872 ap
->ops
->set_dmamode(ap
, dev
);
1878 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1879 * @ap: port on which timings will be programmed
1881 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1884 * PCI/etc. bus probe sem.
1887 static void ata_set_mode(struct ata_port
*ap
)
1889 unsigned int xfer_shift
;
1893 /* step 1: always set host PIO timings */
1894 rc
= ata_host_set_pio(ap
);
1898 /* step 2: choose the best data xfer mode */
1899 xfer_mode
= xfer_shift
= 0;
1900 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1904 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1905 if (xfer_shift
!= ATA_SHIFT_PIO
)
1906 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1908 /* step 4: update devices' xfer mode */
1909 ata_dev_set_mode(ap
, &ap
->device
[0]);
1910 ata_dev_set_mode(ap
, &ap
->device
[1]);
1912 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1915 if (ap
->ops
->post_set_mode
)
1916 ap
->ops
->post_set_mode(ap
);
1921 ata_port_disable(ap
);
1925 * ata_busy_sleep - sleep until BSY clears, or timeout
1926 * @ap: port containing status register to be polled
1927 * @tmout_pat: impatience timeout
1928 * @tmout: overall timeout
1930 * Sleep until ATA Status register bit BSY clears,
1931 * or a timeout occurs.
1937 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1938 unsigned long tmout_pat
,
1939 unsigned long tmout
)
1941 unsigned long timer_start
, timeout
;
1944 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1945 timer_start
= jiffies
;
1946 timeout
= timer_start
+ tmout_pat
;
1947 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1949 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1952 if (status
& ATA_BUSY
)
1953 printk(KERN_WARNING
"ata%u is slow to respond, "
1954 "please be patient\n", ap
->id
);
1956 timeout
= timer_start
+ tmout
;
1957 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1959 status
= ata_chk_status(ap
);
1962 if (status
& ATA_BUSY
) {
1963 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1964 ap
->id
, tmout
/ HZ
);
1971 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1973 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1974 unsigned int dev0
= devmask
& (1 << 0);
1975 unsigned int dev1
= devmask
& (1 << 1);
1976 unsigned long timeout
;
1978 /* if device 0 was found in ata_devchk, wait for its
1982 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1984 /* if device 1 was found in ata_devchk, wait for
1985 * register access, then wait for BSY to clear
1987 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1991 ap
->ops
->dev_select(ap
, 1);
1992 if (ap
->flags
& ATA_FLAG_MMIO
) {
1993 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1994 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1996 nsect
= inb(ioaddr
->nsect_addr
);
1997 lbal
= inb(ioaddr
->lbal_addr
);
1999 if ((nsect
== 1) && (lbal
== 1))
2001 if (time_after(jiffies
, timeout
)) {
2005 msleep(50); /* give drive a breather */
2008 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2010 /* is all this really necessary? */
2011 ap
->ops
->dev_select(ap
, 0);
2013 ap
->ops
->dev_select(ap
, 1);
2015 ap
->ops
->dev_select(ap
, 0);
2019 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
2020 * @ap: Port to reset and probe
2022 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
2023 * probe the bus. Not often used these days.
2026 * PCI/etc. bus probe sem.
2027 * Obtains host_set lock.
2031 static unsigned int ata_bus_edd(struct ata_port
*ap
)
2033 struct ata_taskfile tf
;
2034 unsigned long flags
;
2036 /* set up execute-device-diag (bus reset) taskfile */
2037 /* also, take interrupts to a known state (disabled) */
2038 DPRINTK("execute-device-diag\n");
2039 ata_tf_init(ap
, &tf
, 0);
2041 tf
.command
= ATA_CMD_EDD
;
2042 tf
.protocol
= ATA_PROT_NODATA
;
2045 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2046 ata_tf_to_host(ap
, &tf
);
2047 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2049 /* spec says at least 2ms. but who knows with those
2050 * crazy ATAPI devices...
2054 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2057 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2058 unsigned int devmask
)
2060 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2062 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2064 /* software reset. causes dev0 to be selected */
2065 if (ap
->flags
& ATA_FLAG_MMIO
) {
2066 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2067 udelay(20); /* FIXME: flush */
2068 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2069 udelay(20); /* FIXME: flush */
2070 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2072 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2074 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2076 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2079 /* spec mandates ">= 2ms" before checking status.
2080 * We wait 150ms, because that was the magic delay used for
2081 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2082 * between when the ATA command register is written, and then
2083 * status is checked. Because waiting for "a while" before
2084 * checking status is fine, post SRST, we perform this magic
2085 * delay here as well.
2089 ata_bus_post_reset(ap
, devmask
);
2095 * ata_bus_reset - reset host port and associated ATA channel
2096 * @ap: port to reset
2098 * This is typically the first time we actually start issuing
2099 * commands to the ATA channel. We wait for BSY to clear, then
2100 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2101 * result. Determine what devices, if any, are on the channel
2102 * by looking at the device 0/1 error register. Look at the signature
2103 * stored in each device's taskfile registers, to determine if
2104 * the device is ATA or ATAPI.
2107 * PCI/etc. bus probe sem.
2108 * Obtains host_set lock.
2111 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2114 void ata_bus_reset(struct ata_port
*ap
)
2116 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2117 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2119 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2121 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2123 /* determine if device 0/1 are present */
2124 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2127 dev0
= ata_devchk(ap
, 0);
2129 dev1
= ata_devchk(ap
, 1);
2133 devmask
|= (1 << 0);
2135 devmask
|= (1 << 1);
2137 /* select device 0 again */
2138 ap
->ops
->dev_select(ap
, 0);
2140 /* issue bus reset */
2141 if (ap
->flags
& ATA_FLAG_SRST
)
2142 rc
= ata_bus_softreset(ap
, devmask
);
2143 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2144 /* set up device control */
2145 if (ap
->flags
& ATA_FLAG_MMIO
)
2146 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2148 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2149 rc
= ata_bus_edd(ap
);
2156 * determine by signature whether we have ATA or ATAPI devices
2158 err
= ata_dev_try_classify(ap
, 0);
2159 if ((slave_possible
) && (err
!= 0x81))
2160 ata_dev_try_classify(ap
, 1);
2162 /* re-enable interrupts */
2163 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2166 /* is double-select really necessary? */
2167 if (ap
->device
[1].class != ATA_DEV_NONE
)
2168 ap
->ops
->dev_select(ap
, 1);
2169 if (ap
->device
[0].class != ATA_DEV_NONE
)
2170 ap
->ops
->dev_select(ap
, 0);
2172 /* if no devices were detected, disable this port */
2173 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2174 (ap
->device
[1].class == ATA_DEV_NONE
))
2177 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2178 /* set up device control for ATA_FLAG_SATA_RESET */
2179 if (ap
->flags
& ATA_FLAG_MMIO
)
2180 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2182 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2189 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2190 ap
->ops
->port_disable(ap
);
2195 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2196 const struct ata_device
*dev
)
2198 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2199 ap
->id
, dev
->devno
);
2202 static const char * const ata_dma_blacklist
[] = {
2221 "Toshiba CD-ROM XM-6202B",
2222 "TOSHIBA CD-ROM XM-1702BC",
2224 "E-IDE CD-ROM CR-840",
2227 "SAMSUNG CD-ROM SC-148C",
2228 "SAMSUNG CD-ROM SC",
2230 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2234 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2236 unsigned char model_num
[40];
2241 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2244 len
= strnlen(s
, sizeof(model_num
));
2246 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2247 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2252 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2253 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2259 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2261 const struct ata_device
*master
, *slave
;
2264 master
= &ap
->device
[0];
2265 slave
= &ap
->device
[1];
2267 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2269 if (shift
== ATA_SHIFT_UDMA
) {
2270 mask
= ap
->udma_mask
;
2271 if (ata_dev_present(master
)) {
2272 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2273 if (ata_dma_blacklisted(master
)) {
2275 ata_pr_blacklisted(ap
, master
);
2278 if (ata_dev_present(slave
)) {
2279 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2280 if (ata_dma_blacklisted(slave
)) {
2282 ata_pr_blacklisted(ap
, slave
);
2286 else if (shift
== ATA_SHIFT_MWDMA
) {
2287 mask
= ap
->mwdma_mask
;
2288 if (ata_dev_present(master
)) {
2289 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2290 if (ata_dma_blacklisted(master
)) {
2292 ata_pr_blacklisted(ap
, master
);
2295 if (ata_dev_present(slave
)) {
2296 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2297 if (ata_dma_blacklisted(slave
)) {
2299 ata_pr_blacklisted(ap
, slave
);
2303 else if (shift
== ATA_SHIFT_PIO
) {
2304 mask
= ap
->pio_mask
;
2305 if (ata_dev_present(master
)) {
2306 /* spec doesn't return explicit support for
2307 * PIO0-2, so we fake it
2309 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2314 if (ata_dev_present(slave
)) {
2315 /* spec doesn't return explicit support for
2316 * PIO0-2, so we fake it
2318 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2325 mask
= 0xffffffff; /* shut up compiler warning */
2332 /* find greatest bit */
2333 static int fgb(u32 bitmap
)
2338 for (i
= 0; i
< 32; i
++)
2339 if (bitmap
& (1 << i
))
2346 * ata_choose_xfer_mode - attempt to find best transfer mode
2347 * @ap: Port for which an xfer mode will be selected
2348 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2349 * @xfer_shift_out: (output) bit shift that selects this mode
2351 * Based on host and device capabilities, determine the
2352 * maximum transfer mode that is amenable to all.
2355 * PCI/etc. bus probe sem.
2358 * Zero on success, negative on error.
2361 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2363 unsigned int *xfer_shift_out
)
2365 unsigned int mask
, shift
;
2368 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2369 shift
= xfer_mode_classes
[i
].shift
;
2370 mask
= ata_get_mode_mask(ap
, shift
);
2374 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2375 *xfer_shift_out
= shift
;
2384 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2385 * @ap: Port associated with device @dev
2386 * @dev: Device to which command will be sent
2388 * Issue SET FEATURES - XFER MODE command to device @dev
2392 * PCI/etc. bus probe sem.
2395 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2397 struct ata_taskfile tf
;
2399 /* set up set-features taskfile */
2400 DPRINTK("set features - xfer mode\n");
2402 ata_tf_init(ap
, &tf
, dev
->devno
);
2403 tf
.command
= ATA_CMD_SET_FEATURES
;
2404 tf
.feature
= SETFEATURES_XFER
;
2405 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2406 tf
.protocol
= ATA_PROT_NODATA
;
2407 tf
.nsect
= dev
->xfer_mode
;
2409 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2410 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2412 ata_port_disable(ap
);
2419 * ata_dev_reread_id - Reread the device identify device info
2420 * @ap: port where the device is
2421 * @dev: device to reread the identify device info
2426 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2428 struct ata_taskfile tf
;
2430 ata_tf_init(ap
, &tf
, dev
->devno
);
2432 if (dev
->class == ATA_DEV_ATA
) {
2433 tf
.command
= ATA_CMD_ID_ATA
;
2434 DPRINTK("do ATA identify\n");
2436 tf
.command
= ATA_CMD_ID_ATAPI
;
2437 DPRINTK("do ATAPI identify\n");
2440 tf
.flags
|= ATA_TFLAG_DEVICE
;
2441 tf
.protocol
= ATA_PROT_PIO
;
2443 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2444 dev
->id
, sizeof(dev
->id
)))
2447 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2455 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2456 ata_port_disable(ap
);
2460 * ata_dev_init_params - Issue INIT DEV PARAMS command
2461 * @ap: Port associated with device @dev
2462 * @dev: Device to which command will be sent
2467 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2469 struct ata_taskfile tf
;
2470 u16 sectors
= dev
->id
[6];
2471 u16 heads
= dev
->id
[3];
2473 /* Number of sectors per track 1-255. Number of heads 1-16 */
2474 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2477 /* set up init dev params taskfile */
2478 DPRINTK("init dev params \n");
2480 ata_tf_init(ap
, &tf
, dev
->devno
);
2481 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2482 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2483 tf
.protocol
= ATA_PROT_NODATA
;
2485 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2487 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2488 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2490 ata_port_disable(ap
);
2497 * ata_sg_clean - Unmap DMA memory associated with command
2498 * @qc: Command containing DMA memory to be released
2500 * Unmap all mapped DMA memory associated with this command.
2503 * spin_lock_irqsave(host_set lock)
2506 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2508 struct ata_port
*ap
= qc
->ap
;
2509 struct scatterlist
*sg
= qc
->__sg
;
2510 int dir
= qc
->dma_dir
;
2511 void *pad_buf
= NULL
;
2513 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2516 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2517 assert(qc
->n_elem
== 1);
2519 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2521 /* if we padded the buffer out to 32-bit bound, and data
2522 * xfer direction is from-device, we must copy from the
2523 * pad buffer back into the supplied buffer
2525 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2526 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2528 if (qc
->flags
& ATA_QCFLAG_SG
) {
2530 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2531 /* restore last sg */
2532 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2534 struct scatterlist
*psg
= &qc
->pad_sgent
;
2535 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2536 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2537 kunmap_atomic(addr
, KM_IRQ0
);
2540 if (sg_dma_len(&sg
[0]) > 0)
2541 dma_unmap_single(ap
->host_set
->dev
,
2542 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2545 sg
->length
+= qc
->pad_len
;
2547 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2548 pad_buf
, qc
->pad_len
);
2551 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2556 * ata_fill_sg - Fill PCI IDE PRD table
2557 * @qc: Metadata associated with taskfile to be transferred
2559 * Fill PCI IDE PRD (scatter-gather) table with segments
2560 * associated with the current disk command.
2563 * spin_lock_irqsave(host_set lock)
2566 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2568 struct ata_port
*ap
= qc
->ap
;
2569 struct scatterlist
*sg
;
2572 assert(qc
->__sg
!= NULL
);
2573 assert(qc
->n_elem
> 0);
2576 ata_for_each_sg(sg
, qc
) {
2580 /* determine if physical DMA addr spans 64K boundary.
2581 * Note h/w doesn't support 64-bit, so we unconditionally
2582 * truncate dma_addr_t to u32.
2584 addr
= (u32
) sg_dma_address(sg
);
2585 sg_len
= sg_dma_len(sg
);
2588 offset
= addr
& 0xffff;
2590 if ((offset
+ sg_len
) > 0x10000)
2591 len
= 0x10000 - offset
;
2593 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2594 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2595 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2604 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2607 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2608 * @qc: Metadata associated with taskfile to check
2610 * Allow low-level driver to filter ATA PACKET commands, returning
2611 * a status indicating whether or not it is OK to use DMA for the
2612 * supplied PACKET command.
2615 * spin_lock_irqsave(host_set lock)
2617 * RETURNS: 0 when ATAPI DMA can be used
2620 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2622 struct ata_port
*ap
= qc
->ap
;
2623 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2625 if (ap
->ops
->check_atapi_dma
)
2626 rc
= ap
->ops
->check_atapi_dma(qc
);
2631 * ata_qc_prep - Prepare taskfile for submission
2632 * @qc: Metadata associated with taskfile to be prepared
2634 * Prepare ATA taskfile for submission.
2637 * spin_lock_irqsave(host_set lock)
2639 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2641 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2648 * ata_sg_init_one - Associate command with memory buffer
2649 * @qc: Command to be associated
2650 * @buf: Memory buffer
2651 * @buflen: Length of memory buffer, in bytes.
2653 * Initialize the data-related elements of queued_cmd @qc
2654 * to point to a single memory buffer, @buf of byte length @buflen.
2657 * spin_lock_irqsave(host_set lock)
2660 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2662 struct scatterlist
*sg
;
2664 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2666 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2667 qc
->__sg
= &qc
->sgent
;
2669 qc
->orig_n_elem
= 1;
2673 sg_init_one(sg
, buf
, buflen
);
2677 * ata_sg_init - Associate command with scatter-gather table.
2678 * @qc: Command to be associated
2679 * @sg: Scatter-gather table.
2680 * @n_elem: Number of elements in s/g table.
2682 * Initialize the data-related elements of queued_cmd @qc
2683 * to point to a scatter-gather table @sg, containing @n_elem
2687 * spin_lock_irqsave(host_set lock)
2690 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2691 unsigned int n_elem
)
2693 qc
->flags
|= ATA_QCFLAG_SG
;
2695 qc
->n_elem
= n_elem
;
2696 qc
->orig_n_elem
= n_elem
;
2700 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2701 * @qc: Command with memory buffer to be mapped.
2703 * DMA-map the memory buffer associated with queued_cmd @qc.
2706 * spin_lock_irqsave(host_set lock)
2709 * Zero on success, negative on error.
2712 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2714 struct ata_port
*ap
= qc
->ap
;
2715 int dir
= qc
->dma_dir
;
2716 struct scatterlist
*sg
= qc
->__sg
;
2717 dma_addr_t dma_address
;
2719 /* we must lengthen transfers to end on a 32-bit boundary */
2720 qc
->pad_len
= sg
->length
& 3;
2722 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2723 struct scatterlist
*psg
= &qc
->pad_sgent
;
2725 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2727 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2729 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2730 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2733 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2734 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2736 sg
->length
-= qc
->pad_len
;
2738 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2739 sg
->length
, qc
->pad_len
);
2743 sg_dma_address(sg
) = 0;
2747 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2749 if (dma_mapping_error(dma_address
)) {
2751 sg
->length
+= qc
->pad_len
;
2755 sg_dma_address(sg
) = dma_address
;
2757 sg_dma_len(sg
) = sg
->length
;
2759 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2760 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2766 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2767 * @qc: Command with scatter-gather table to be mapped.
2769 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2772 * spin_lock_irqsave(host_set lock)
2775 * Zero on success, negative on error.
2779 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2781 struct ata_port
*ap
= qc
->ap
;
2782 struct scatterlist
*sg
= qc
->__sg
;
2783 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2784 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2786 VPRINTK("ENTER, ata%u\n", ap
->id
);
2787 assert(qc
->flags
& ATA_QCFLAG_SG
);
2789 /* we must lengthen transfers to end on a 32-bit boundary */
2790 qc
->pad_len
= lsg
->length
& 3;
2792 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2793 struct scatterlist
*psg
= &qc
->pad_sgent
;
2794 unsigned int offset
;
2796 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2798 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2801 * psg->page/offset are used to copy to-be-written
2802 * data in this function or read data in ata_sg_clean.
2804 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2805 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2806 psg
->offset
= offset_in_page(offset
);
2808 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2809 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2810 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2811 kunmap_atomic(addr
, KM_IRQ0
);
2814 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2815 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2817 lsg
->length
-= qc
->pad_len
;
2818 if (lsg
->length
== 0)
2821 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2822 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2825 pre_n_elem
= qc
->n_elem
;
2826 if (trim_sg
&& pre_n_elem
)
2835 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2837 /* restore last sg */
2838 lsg
->length
+= qc
->pad_len
;
2842 DPRINTK("%d sg elements mapped\n", n_elem
);
2845 qc
->n_elem
= n_elem
;
2851 * ata_poll_qc_complete - turn irq back on and finish qc
2852 * @qc: Command to complete
2853 * @err_mask: ATA status register content
2856 * None. (grabs host lock)
2859 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2861 struct ata_port
*ap
= qc
->ap
;
2862 unsigned long flags
;
2864 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2865 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2867 ata_qc_complete(qc
);
2868 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2873 * @ap: the target ata_port
2876 * None. (executing in kernel thread context)
2879 * timeout value to use
2882 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2884 struct ata_queued_cmd
*qc
;
2886 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2887 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2889 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2892 switch (ap
->hsm_task_state
) {
2895 poll_state
= HSM_ST_POLL
;
2899 case HSM_ST_LAST_POLL
:
2900 poll_state
= HSM_ST_LAST_POLL
;
2901 reg_state
= HSM_ST_LAST
;
2908 status
= ata_chk_status(ap
);
2909 if (status
& ATA_BUSY
) {
2910 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2911 qc
->err_mask
|= AC_ERR_ATA_BUS
;
2912 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2915 ap
->hsm_task_state
= poll_state
;
2916 return ATA_SHORT_PAUSE
;
2919 ap
->hsm_task_state
= reg_state
;
2924 * ata_pio_complete - check if drive is busy or idle
2925 * @ap: the target ata_port
2928 * None. (executing in kernel thread context)
2931 * Non-zero if qc completed, zero otherwise.
2934 static int ata_pio_complete (struct ata_port
*ap
)
2936 struct ata_queued_cmd
*qc
;
2940 * This is purely heuristic. This is a fast path. Sometimes when
2941 * we enter, BSY will be cleared in a chk-status or two. If not,
2942 * the drive is probably seeking or something. Snooze for a couple
2943 * msecs, then chk-status again. If still busy, fall back to
2944 * HSM_ST_POLL state.
2946 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2947 if (drv_stat
& ATA_BUSY
) {
2949 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2950 if (drv_stat
& ATA_BUSY
) {
2951 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2952 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2957 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2960 drv_stat
= ata_wait_idle(ap
);
2961 if (!ata_ok(drv_stat
)) {
2962 qc
->err_mask
|= __ac_err_mask(drv_stat
);
2963 ap
->hsm_task_state
= HSM_ST_ERR
;
2967 ap
->hsm_task_state
= HSM_ST_IDLE
;
2969 assert(qc
->err_mask
== 0);
2970 ata_poll_qc_complete(qc
);
2972 /* another command may start at this point */
2979 * swap_buf_le16 - swap halves of 16-words in place
2980 * @buf: Buffer to swap
2981 * @buf_words: Number of 16-bit words in buffer.
2983 * Swap halves of 16-bit words if needed to convert from
2984 * little-endian byte order to native cpu byte order, or
2988 * Inherited from caller.
2990 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
2995 for (i
= 0; i
< buf_words
; i
++)
2996 buf
[i
] = le16_to_cpu(buf
[i
]);
2997 #endif /* __BIG_ENDIAN */
3001 * ata_mmio_data_xfer - Transfer data by MMIO
3002 * @ap: port to read/write
3004 * @buflen: buffer length
3005 * @write_data: read/write
3007 * Transfer data from/to the device data register by MMIO.
3010 * Inherited from caller.
3013 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3014 unsigned int buflen
, int write_data
)
3017 unsigned int words
= buflen
>> 1;
3018 u16
*buf16
= (u16
*) buf
;
3019 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3021 /* Transfer multiple of 2 bytes */
3023 for (i
= 0; i
< words
; i
++)
3024 writew(le16_to_cpu(buf16
[i
]), mmio
);
3026 for (i
= 0; i
< words
; i
++)
3027 buf16
[i
] = cpu_to_le16(readw(mmio
));
3030 /* Transfer trailing 1 byte, if any. */
3031 if (unlikely(buflen
& 0x01)) {
3032 u16 align_buf
[1] = { 0 };
3033 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3036 memcpy(align_buf
, trailing_buf
, 1);
3037 writew(le16_to_cpu(align_buf
[0]), mmio
);
3039 align_buf
[0] = cpu_to_le16(readw(mmio
));
3040 memcpy(trailing_buf
, align_buf
, 1);
3046 * ata_pio_data_xfer - Transfer data by PIO
3047 * @ap: port to read/write
3049 * @buflen: buffer length
3050 * @write_data: read/write
3052 * Transfer data from/to the device data register by PIO.
3055 * Inherited from caller.
3058 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3059 unsigned int buflen
, int write_data
)
3061 unsigned int words
= buflen
>> 1;
3063 /* Transfer multiple of 2 bytes */
3065 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3067 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3069 /* Transfer trailing 1 byte, if any. */
3070 if (unlikely(buflen
& 0x01)) {
3071 u16 align_buf
[1] = { 0 };
3072 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3075 memcpy(align_buf
, trailing_buf
, 1);
3076 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3078 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3079 memcpy(trailing_buf
, align_buf
, 1);
3085 * ata_data_xfer - Transfer data from/to the data register.
3086 * @ap: port to read/write
3088 * @buflen: buffer length
3089 * @do_write: read/write
3091 * Transfer data from/to the device data register.
3094 * Inherited from caller.
3097 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3098 unsigned int buflen
, int do_write
)
3100 /* Make the crap hardware pay the costs not the good stuff */
3101 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3102 unsigned long flags
;
3103 local_irq_save(flags
);
3104 if (ap
->flags
& ATA_FLAG_MMIO
)
3105 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3107 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3108 local_irq_restore(flags
);
3110 if (ap
->flags
& ATA_FLAG_MMIO
)
3111 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3113 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3118 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3119 * @qc: Command on going
3121 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3124 * Inherited from caller.
3127 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3129 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3130 struct scatterlist
*sg
= qc
->__sg
;
3131 struct ata_port
*ap
= qc
->ap
;
3133 unsigned int offset
;
3136 if (qc
->cursect
== (qc
->nsect
- 1))
3137 ap
->hsm_task_state
= HSM_ST_LAST
;
3139 page
= sg
[qc
->cursg
].page
;
3140 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3142 /* get the current page and offset */
3143 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3144 offset
%= PAGE_SIZE
;
3146 buf
= kmap(page
) + offset
;
3151 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3156 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3158 /* do the actual data transfer */
3159 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3160 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3166 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3167 * @qc: Command on going
3168 * @bytes: number of bytes
3170 * Transfer Transfer data from/to the ATAPI device.
3173 * Inherited from caller.
3177 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3179 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3180 struct scatterlist
*sg
= qc
->__sg
;
3181 struct ata_port
*ap
= qc
->ap
;
3184 unsigned int offset
, count
;
3186 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3187 ap
->hsm_task_state
= HSM_ST_LAST
;
3190 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3192 * The end of qc->sg is reached and the device expects
3193 * more data to transfer. In order not to overrun qc->sg
3194 * and fulfill length specified in the byte count register,
3195 * - for read case, discard trailing data from the device
3196 * - for write case, padding zero data to the device
3198 u16 pad_buf
[1] = { 0 };
3199 unsigned int words
= bytes
>> 1;
3202 if (words
) /* warning if bytes > 1 */
3203 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3206 for (i
= 0; i
< words
; i
++)
3207 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3209 ap
->hsm_task_state
= HSM_ST_LAST
;
3213 sg
= &qc
->__sg
[qc
->cursg
];
3216 offset
= sg
->offset
+ qc
->cursg_ofs
;
3218 /* get the current page and offset */
3219 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3220 offset
%= PAGE_SIZE
;
3222 /* don't overrun current sg */
3223 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3225 /* don't cross page boundaries */
3226 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3228 buf
= kmap(page
) + offset
;
3231 qc
->curbytes
+= count
;
3232 qc
->cursg_ofs
+= count
;
3234 if (qc
->cursg_ofs
== sg
->length
) {
3239 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3241 /* do the actual data transfer */
3242 ata_data_xfer(ap
, buf
, count
, do_write
);
3251 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3252 * @qc: Command on going
3254 * Transfer Transfer data from/to the ATAPI device.
3257 * Inherited from caller.
3260 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3262 struct ata_port
*ap
= qc
->ap
;
3263 struct ata_device
*dev
= qc
->dev
;
3264 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3265 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3267 ap
->ops
->tf_read(ap
, &qc
->tf
);
3268 ireason
= qc
->tf
.nsect
;
3269 bc_lo
= qc
->tf
.lbam
;
3270 bc_hi
= qc
->tf
.lbah
;
3271 bytes
= (bc_hi
<< 8) | bc_lo
;
3273 /* shall be cleared to zero, indicating xfer of data */
3274 if (ireason
& (1 << 0))
3277 /* make sure transfer direction matches expected */
3278 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3279 if (do_write
!= i_write
)
3282 __atapi_pio_bytes(qc
, bytes
);
3287 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3288 ap
->id
, dev
->devno
);
3289 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3290 ap
->hsm_task_state
= HSM_ST_ERR
;
3294 * ata_pio_block - start PIO on a block
3295 * @ap: the target ata_port
3298 * None. (executing in kernel thread context)
3301 static void ata_pio_block(struct ata_port
*ap
)
3303 struct ata_queued_cmd
*qc
;
3307 * This is purely heuristic. This is a fast path.
3308 * Sometimes when we enter, BSY will be cleared in
3309 * a chk-status or two. If not, the drive is probably seeking
3310 * or something. Snooze for a couple msecs, then
3311 * chk-status again. If still busy, fall back to
3312 * HSM_ST_POLL state.
3314 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3315 if (status
& ATA_BUSY
) {
3317 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3318 if (status
& ATA_BUSY
) {
3319 ap
->hsm_task_state
= HSM_ST_POLL
;
3320 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3325 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3329 if (status
& (ATA_ERR
| ATA_DF
)) {
3330 qc
->err_mask
|= AC_ERR_DEV
;
3331 ap
->hsm_task_state
= HSM_ST_ERR
;
3335 /* transfer data if any */
3336 if (is_atapi_taskfile(&qc
->tf
)) {
3337 /* DRQ=0 means no more data to transfer */
3338 if ((status
& ATA_DRQ
) == 0) {
3339 ap
->hsm_task_state
= HSM_ST_LAST
;
3343 atapi_pio_bytes(qc
);
3345 /* handle BSY=0, DRQ=0 as error */
3346 if ((status
& ATA_DRQ
) == 0) {
3347 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3348 ap
->hsm_task_state
= HSM_ST_ERR
;
3356 static void ata_pio_error(struct ata_port
*ap
)
3358 struct ata_queued_cmd
*qc
;
3360 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3362 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3365 /* make sure qc->err_mask is available to
3366 * know what's wrong and recover
3368 assert(qc
->err_mask
);
3370 ap
->hsm_task_state
= HSM_ST_IDLE
;
3372 ata_poll_qc_complete(qc
);
3375 static void ata_pio_task(void *_data
)
3377 struct ata_port
*ap
= _data
;
3378 unsigned long timeout
;
3385 switch (ap
->hsm_task_state
) {
3394 qc_completed
= ata_pio_complete(ap
);
3398 case HSM_ST_LAST_POLL
:
3399 timeout
= ata_pio_poll(ap
);
3409 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
3410 else if (!qc_completed
)
3415 * ata_qc_timeout - Handle timeout of queued command
3416 * @qc: Command that timed out
3418 * Some part of the kernel (currently, only the SCSI layer)
3419 * has noticed that the active command on port @ap has not
3420 * completed after a specified length of time. Handle this
3421 * condition by disabling DMA (if necessary) and completing
3422 * transactions, with error if necessary.
3424 * This also handles the case of the "lost interrupt", where
3425 * for some reason (possibly hardware bug, possibly driver bug)
3426 * an interrupt was not delivered to the driver, even though the
3427 * transaction completed successfully.
3430 * Inherited from SCSI layer (none, can sleep)
3433 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3435 struct ata_port
*ap
= qc
->ap
;
3436 struct ata_host_set
*host_set
= ap
->host_set
;
3437 u8 host_stat
= 0, drv_stat
;
3438 unsigned long flags
;
3442 spin_lock_irqsave(&host_set
->lock
, flags
);
3444 /* hack alert! We cannot use the supplied completion
3445 * function from inside the ->eh_strategy_handler() thread.
3446 * libata is the only user of ->eh_strategy_handler() in
3447 * any kernel, so the default scsi_done() assumes it is
3448 * not being called from the SCSI EH.
3450 qc
->scsidone
= scsi_finish_command
;
3452 switch (qc
->tf
.protocol
) {
3455 case ATA_PROT_ATAPI_DMA
:
3456 host_stat
= ap
->ops
->bmdma_status(ap
);
3458 /* before we do anything else, clear DMA-Start bit */
3459 ap
->ops
->bmdma_stop(qc
);
3465 drv_stat
= ata_chk_status(ap
);
3467 /* ack bmdma irq events */
3468 ap
->ops
->irq_clear(ap
);
3470 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3471 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3473 /* complete taskfile transaction */
3474 qc
->err_mask
|= ac_err_mask(drv_stat
);
3475 ata_qc_complete(qc
);
3479 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3485 * ata_eng_timeout - Handle timeout of queued command
3486 * @ap: Port on which timed-out command is active
3488 * Some part of the kernel (currently, only the SCSI layer)
3489 * has noticed that the active command on port @ap has not
3490 * completed after a specified length of time. Handle this
3491 * condition by disabling DMA (if necessary) and completing
3492 * transactions, with error if necessary.
3494 * This also handles the case of the "lost interrupt", where
3495 * for some reason (possibly hardware bug, possibly driver bug)
3496 * an interrupt was not delivered to the driver, even though the
3497 * transaction completed successfully.
3500 * Inherited from SCSI layer (none, can sleep)
3503 void ata_eng_timeout(struct ata_port
*ap
)
3505 struct ata_queued_cmd
*qc
;
3509 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3513 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3523 * ata_qc_new - Request an available ATA command, for queueing
3524 * @ap: Port associated with device @dev
3525 * @dev: Device from whom we request an available command structure
3531 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3533 struct ata_queued_cmd
*qc
= NULL
;
3536 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3537 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3538 qc
= ata_qc_from_tag(ap
, i
);
3549 * ata_qc_new_init - Request an available ATA command, and initialize it
3550 * @ap: Port associated with device @dev
3551 * @dev: Device from whom we request an available command structure
3557 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3558 struct ata_device
*dev
)
3560 struct ata_queued_cmd
*qc
;
3562 qc
= ata_qc_new(ap
);
3574 static void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3576 struct ata_port
*ap
= qc
->ap
;
3581 if (likely(ata_tag_valid(tag
))) {
3582 if (tag
== ap
->active_tag
)
3583 ap
->active_tag
= ATA_TAG_POISON
;
3584 qc
->tag
= ATA_TAG_POISON
;
3585 clear_bit(tag
, &ap
->qactive
);
3590 * ata_qc_free - free unused ata_queued_cmd
3591 * @qc: Command to complete
3593 * Designed to free unused ata_queued_cmd object
3594 * in case something prevents using it.
3597 * spin_lock_irqsave(host_set lock)
3599 void ata_qc_free(struct ata_queued_cmd
*qc
)
3601 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3603 __ata_qc_complete(qc
);
3607 * ata_qc_complete - Complete an active ATA command
3608 * @qc: Command to complete
3609 * @err_mask: ATA Status register contents
3611 * Indicate to the mid and upper layers that an ATA
3612 * command has completed, with either an ok or not-ok status.
3615 * spin_lock_irqsave(host_set lock)
3618 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3622 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3623 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3625 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3628 /* atapi: mark qc as inactive to prevent the interrupt handler
3629 * from completing the command twice later, before the error handler
3630 * is called. (when rc != 0 and atapi request sense is needed)
3632 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3634 /* call completion callback */
3635 rc
= qc
->complete_fn(qc
);
3637 /* if callback indicates not to complete command (non-zero),
3638 * return immediately
3643 __ata_qc_complete(qc
);
3648 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3650 struct ata_port
*ap
= qc
->ap
;
3652 switch (qc
->tf
.protocol
) {
3654 case ATA_PROT_ATAPI_DMA
:
3657 case ATA_PROT_ATAPI
:
3659 case ATA_PROT_PIO_MULT
:
3660 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3673 * ata_qc_issue - issue taskfile to device
3674 * @qc: command to issue to device
3676 * Prepare an ATA command to submission to device.
3677 * This includes mapping the data into a DMA-able
3678 * area, filling in the S/G table, and finally
3679 * writing the taskfile to hardware, starting the command.
3682 * spin_lock_irqsave(host_set lock)
3685 * Zero on success, negative on error.
3688 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3690 struct ata_port
*ap
= qc
->ap
;
3692 if (ata_should_dma_map(qc
)) {
3693 if (qc
->flags
& ATA_QCFLAG_SG
) {
3694 if (ata_sg_setup(qc
))
3696 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3697 if (ata_sg_setup_one(qc
))
3701 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3704 ap
->ops
->qc_prep(qc
);
3706 qc
->ap
->active_tag
= qc
->tag
;
3707 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3709 return ap
->ops
->qc_issue(qc
);
3717 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3718 * @qc: command to issue to device
3720 * Using various libata functions and hooks, this function
3721 * starts an ATA command. ATA commands are grouped into
3722 * classes called "protocols", and issuing each type of protocol
3723 * is slightly different.
3725 * May be used as the qc_issue() entry in ata_port_operations.
3728 * spin_lock_irqsave(host_set lock)
3731 * Zero on success, negative on error.
3734 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3736 struct ata_port
*ap
= qc
->ap
;
3738 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3740 switch (qc
->tf
.protocol
) {
3741 case ATA_PROT_NODATA
:
3742 ata_tf_to_host(ap
, &qc
->tf
);
3746 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3747 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3748 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3751 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3752 ata_qc_set_polling(qc
);
3753 ata_tf_to_host(ap
, &qc
->tf
);
3754 ap
->hsm_task_state
= HSM_ST
;
3755 queue_work(ata_wq
, &ap
->pio_task
);
3758 case ATA_PROT_ATAPI
:
3759 ata_qc_set_polling(qc
);
3760 ata_tf_to_host(ap
, &qc
->tf
);
3761 queue_work(ata_wq
, &ap
->packet_task
);
3764 case ATA_PROT_ATAPI_NODATA
:
3765 ap
->flags
|= ATA_FLAG_NOINTR
;
3766 ata_tf_to_host(ap
, &qc
->tf
);
3767 queue_work(ata_wq
, &ap
->packet_task
);
3770 case ATA_PROT_ATAPI_DMA
:
3771 ap
->flags
|= ATA_FLAG_NOINTR
;
3772 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3773 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3774 queue_work(ata_wq
, &ap
->packet_task
);
3786 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3787 * @qc: Info associated with this ATA transaction.
3790 * spin_lock_irqsave(host_set lock)
3793 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3795 struct ata_port
*ap
= qc
->ap
;
3796 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3798 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3800 /* load PRD table addr. */
3801 mb(); /* make sure PRD table writes are visible to controller */
3802 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3804 /* specify data direction, triple-check start bit is clear */
3805 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3806 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3808 dmactl
|= ATA_DMA_WR
;
3809 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3811 /* issue r/w command */
3812 ap
->ops
->exec_command(ap
, &qc
->tf
);
3816 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3817 * @qc: Info associated with this ATA transaction.
3820 * spin_lock_irqsave(host_set lock)
3823 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3825 struct ata_port
*ap
= qc
->ap
;
3826 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3829 /* start host DMA transaction */
3830 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3831 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3833 /* Strictly, one may wish to issue a readb() here, to
3834 * flush the mmio write. However, control also passes
3835 * to the hardware at this point, and it will interrupt
3836 * us when we are to resume control. So, in effect,
3837 * we don't care when the mmio write flushes.
3838 * Further, a read of the DMA status register _immediately_
3839 * following the write may not be what certain flaky hardware
3840 * is expected, so I think it is best to not add a readb()
3841 * without first all the MMIO ATA cards/mobos.
3842 * Or maybe I'm just being paranoid.
3847 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3848 * @qc: Info associated with this ATA transaction.
3851 * spin_lock_irqsave(host_set lock)
3854 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3856 struct ata_port
*ap
= qc
->ap
;
3857 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3860 /* load PRD table addr. */
3861 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3863 /* specify data direction, triple-check start bit is clear */
3864 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3865 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3867 dmactl
|= ATA_DMA_WR
;
3868 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3870 /* issue r/w command */
3871 ap
->ops
->exec_command(ap
, &qc
->tf
);
3875 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3876 * @qc: Info associated with this ATA transaction.
3879 * spin_lock_irqsave(host_set lock)
3882 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3884 struct ata_port
*ap
= qc
->ap
;
3887 /* start host DMA transaction */
3888 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3889 outb(dmactl
| ATA_DMA_START
,
3890 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3895 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3896 * @qc: Info associated with this ATA transaction.
3898 * Writes the ATA_DMA_START flag to the DMA command register.
3900 * May be used as the bmdma_start() entry in ata_port_operations.
3903 * spin_lock_irqsave(host_set lock)
3905 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3907 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3908 ata_bmdma_start_mmio(qc
);
3910 ata_bmdma_start_pio(qc
);
3915 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3916 * @qc: Info associated with this ATA transaction.
3918 * Writes address of PRD table to device's PRD Table Address
3919 * register, sets the DMA control register, and calls
3920 * ops->exec_command() to start the transfer.
3922 * May be used as the bmdma_setup() entry in ata_port_operations.
3925 * spin_lock_irqsave(host_set lock)
3927 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3929 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3930 ata_bmdma_setup_mmio(qc
);
3932 ata_bmdma_setup_pio(qc
);
3937 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3938 * @ap: Port associated with this ATA transaction.
3940 * Clear interrupt and error flags in DMA status register.
3942 * May be used as the irq_clear() entry in ata_port_operations.
3945 * spin_lock_irqsave(host_set lock)
3948 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3950 if (ap
->flags
& ATA_FLAG_MMIO
) {
3951 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3952 writeb(readb(mmio
), mmio
);
3954 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3955 outb(inb(addr
), addr
);
3962 * ata_bmdma_status - Read PCI IDE BMDMA status
3963 * @ap: Port associated with this ATA transaction.
3965 * Read and return BMDMA status register.
3967 * May be used as the bmdma_status() entry in ata_port_operations.
3970 * spin_lock_irqsave(host_set lock)
3973 u8
ata_bmdma_status(struct ata_port
*ap
)
3976 if (ap
->flags
& ATA_FLAG_MMIO
) {
3977 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3978 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3980 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3986 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3987 * @qc: Command we are ending DMA for
3989 * Clears the ATA_DMA_START flag in the dma control register
3991 * May be used as the bmdma_stop() entry in ata_port_operations.
3994 * spin_lock_irqsave(host_set lock)
3997 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3999 struct ata_port
*ap
= qc
->ap
;
4000 if (ap
->flags
& ATA_FLAG_MMIO
) {
4001 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4003 /* clear start/stop bit */
4004 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4005 mmio
+ ATA_DMA_CMD
);
4007 /* clear start/stop bit */
4008 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4009 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4012 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4013 ata_altstatus(ap
); /* dummy read */
4017 * ata_host_intr - Handle host interrupt for given (port, task)
4018 * @ap: Port on which interrupt arrived (possibly...)
4019 * @qc: Taskfile currently active in engine
4021 * Handle host interrupt for given queued command. Currently,
4022 * only DMA interrupts are handled. All other commands are
4023 * handled via polling with interrupts disabled (nIEN bit).
4026 * spin_lock_irqsave(host_set lock)
4029 * One if interrupt was handled, zero if not (shared irq).
4032 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4033 struct ata_queued_cmd
*qc
)
4035 u8 status
, host_stat
;
4037 switch (qc
->tf
.protocol
) {
4040 case ATA_PROT_ATAPI_DMA
:
4041 case ATA_PROT_ATAPI
:
4042 /* check status of DMA engine */
4043 host_stat
= ap
->ops
->bmdma_status(ap
);
4044 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4046 /* if it's not our irq... */
4047 if (!(host_stat
& ATA_DMA_INTR
))
4050 /* before we do anything else, clear DMA-Start bit */
4051 ap
->ops
->bmdma_stop(qc
);
4055 case ATA_PROT_ATAPI_NODATA
:
4056 case ATA_PROT_NODATA
:
4057 /* check altstatus */
4058 status
= ata_altstatus(ap
);
4059 if (status
& ATA_BUSY
)
4062 /* check main status, clearing INTRQ */
4063 status
= ata_chk_status(ap
);
4064 if (unlikely(status
& ATA_BUSY
))
4066 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4067 ap
->id
, qc
->tf
.protocol
, status
);
4069 /* ack bmdma irq events */
4070 ap
->ops
->irq_clear(ap
);
4072 /* complete taskfile transaction */
4073 qc
->err_mask
|= ac_err_mask(status
);
4074 ata_qc_complete(qc
);
4081 return 1; /* irq handled */
4084 ap
->stats
.idle_irq
++;
4087 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4089 ata_irq_ack(ap
, 0); /* debug trap */
4090 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4093 return 0; /* irq not handled */
4097 * ata_interrupt - Default ATA host interrupt handler
4098 * @irq: irq line (unused)
4099 * @dev_instance: pointer to our ata_host_set information structure
4102 * Default interrupt handler for PCI IDE devices. Calls
4103 * ata_host_intr() for each port that is not disabled.
4106 * Obtains host_set lock during operation.
4109 * IRQ_NONE or IRQ_HANDLED.
4112 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4114 struct ata_host_set
*host_set
= dev_instance
;
4116 unsigned int handled
= 0;
4117 unsigned long flags
;
4119 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4120 spin_lock_irqsave(&host_set
->lock
, flags
);
4122 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4123 struct ata_port
*ap
;
4125 ap
= host_set
->ports
[i
];
4127 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4128 struct ata_queued_cmd
*qc
;
4130 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4131 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4132 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4133 handled
|= ata_host_intr(ap
, qc
);
4137 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4139 return IRQ_RETVAL(handled
);
4143 * atapi_packet_task - Write CDB bytes to hardware
4144 * @_data: Port to which ATAPI device is attached.
4146 * When device has indicated its readiness to accept
4147 * a CDB, this function is called. Send the CDB.
4148 * If DMA is to be performed, exit immediately.
4149 * Otherwise, we are in polling mode, so poll
4150 * status under operation succeeds or fails.
4153 * Kernel thread context (may sleep)
4156 static void atapi_packet_task(void *_data
)
4158 struct ata_port
*ap
= _data
;
4159 struct ata_queued_cmd
*qc
;
4162 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4164 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4166 /* sleep-wait for BSY to clear */
4167 DPRINTK("busy wait\n");
4168 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4169 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4173 /* make sure DRQ is set */
4174 status
= ata_chk_status(ap
);
4175 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4176 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4181 DPRINTK("send cdb\n");
4182 assert(ap
->cdb_len
>= 12);
4184 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4185 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4186 unsigned long flags
;
4188 /* Once we're done issuing command and kicking bmdma,
4189 * irq handler takes over. To not lose irq, we need
4190 * to clear NOINTR flag before sending cdb, but
4191 * interrupt handler shouldn't be invoked before we're
4192 * finished. Hence, the following locking.
4194 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4195 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4196 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4197 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4198 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4199 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4201 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4203 /* PIO commands are handled by polling */
4204 ap
->hsm_task_state
= HSM_ST
;
4205 queue_work(ata_wq
, &ap
->pio_task
);
4211 ata_poll_qc_complete(qc
);
4216 * ata_port_start - Set port up for dma.
4217 * @ap: Port to initialize
4219 * Called just after data structures for each port are
4220 * initialized. Allocates space for PRD table.
4222 * May be used as the port_start() entry in ata_port_operations.
4225 * Inherited from caller.
4229 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4230 * without filling any other registers
4232 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4235 struct ata_taskfile tf
;
4238 ata_tf_init(ap
, &tf
, dev
->devno
);
4241 tf
.flags
|= ATA_TFLAG_DEVICE
;
4242 tf
.protocol
= ATA_PROT_NODATA
;
4244 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4246 printk(KERN_ERR
"%s: ata command failed: %d\n",
4252 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4256 if (!ata_try_flush_cache(dev
))
4259 if (ata_id_has_flush_ext(dev
->id
))
4260 cmd
= ATA_CMD_FLUSH_EXT
;
4262 cmd
= ATA_CMD_FLUSH
;
4264 return ata_do_simple_cmd(ap
, dev
, cmd
);
4267 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4269 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4272 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4274 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4278 * ata_device_resume - wakeup a previously suspended devices
4280 * Kick the drive back into action, by sending it an idle immediate
4281 * command and making sure its transfer mode matches between drive
4285 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4287 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4288 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4291 if (!ata_dev_present(dev
))
4293 if (dev
->class == ATA_DEV_ATA
)
4294 ata_start_drive(ap
, dev
);
4300 * ata_device_suspend - prepare a device for suspend
4302 * Flush the cache on the drive, if appropriate, then issue a
4303 * standbynow command.
4306 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4308 if (!ata_dev_present(dev
))
4310 if (dev
->class == ATA_DEV_ATA
)
4311 ata_flush_cache(ap
, dev
);
4313 ata_standby_drive(ap
, dev
);
4314 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4318 int ata_port_start (struct ata_port
*ap
)
4320 struct device
*dev
= ap
->host_set
->dev
;
4323 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4327 rc
= ata_pad_alloc(ap
, dev
);
4329 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4333 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4340 * ata_port_stop - Undo ata_port_start()
4341 * @ap: Port to shut down
4343 * Frees the PRD table.
4345 * May be used as the port_stop() entry in ata_port_operations.
4348 * Inherited from caller.
4351 void ata_port_stop (struct ata_port
*ap
)
4353 struct device
*dev
= ap
->host_set
->dev
;
4355 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4356 ata_pad_free(ap
, dev
);
4359 void ata_host_stop (struct ata_host_set
*host_set
)
4361 if (host_set
->mmio_base
)
4362 iounmap(host_set
->mmio_base
);
4367 * ata_host_remove - Unregister SCSI host structure with upper layers
4368 * @ap: Port to unregister
4369 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4372 * Inherited from caller.
4375 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4377 struct Scsi_Host
*sh
= ap
->host
;
4382 scsi_remove_host(sh
);
4384 ap
->ops
->port_stop(ap
);
4388 * ata_host_init - Initialize an ata_port structure
4389 * @ap: Structure to initialize
4390 * @host: associated SCSI mid-layer structure
4391 * @host_set: Collection of hosts to which @ap belongs
4392 * @ent: Probe information provided by low-level driver
4393 * @port_no: Port number associated with this ata_port
4395 * Initialize a new ata_port structure, and its associated
4399 * Inherited from caller.
4402 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4403 struct ata_host_set
*host_set
,
4404 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4410 host
->max_channel
= 1;
4411 host
->unique_id
= ata_unique_id
++;
4412 host
->max_cmd_len
= 12;
4414 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4415 ap
->id
= host
->unique_id
;
4417 ap
->ctl
= ATA_DEVCTL_OBS
;
4418 ap
->host_set
= host_set
;
4419 ap
->port_no
= port_no
;
4421 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4422 ap
->pio_mask
= ent
->pio_mask
;
4423 ap
->mwdma_mask
= ent
->mwdma_mask
;
4424 ap
->udma_mask
= ent
->udma_mask
;
4425 ap
->flags
|= ent
->host_flags
;
4426 ap
->ops
= ent
->port_ops
;
4427 ap
->cbl
= ATA_CBL_NONE
;
4428 ap
->active_tag
= ATA_TAG_POISON
;
4429 ap
->last_ctl
= 0xFF;
4431 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4432 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4434 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4435 ap
->device
[i
].devno
= i
;
4438 ap
->stats
.unhandled_irq
= 1;
4439 ap
->stats
.idle_irq
= 1;
4442 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4446 * ata_host_add - Attach low-level ATA driver to system
4447 * @ent: Information provided by low-level driver
4448 * @host_set: Collections of ports to which we add
4449 * @port_no: Port number associated with this host
4451 * Attach low-level ATA driver to system.
4454 * PCI/etc. bus probe sem.
4457 * New ata_port on success, for NULL on error.
4460 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4461 struct ata_host_set
*host_set
,
4462 unsigned int port_no
)
4464 struct Scsi_Host
*host
;
4465 struct ata_port
*ap
;
4469 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4473 ap
= (struct ata_port
*) &host
->hostdata
[0];
4475 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4477 rc
= ap
->ops
->port_start(ap
);
4484 scsi_host_put(host
);
4489 * ata_device_add - Register hardware device with ATA and SCSI layers
4490 * @ent: Probe information describing hardware device to be registered
4492 * This function processes the information provided in the probe
4493 * information struct @ent, allocates the necessary ATA and SCSI
4494 * host information structures, initializes them, and registers
4495 * everything with requisite kernel subsystems.
4497 * This function requests irqs, probes the ATA bus, and probes
4501 * PCI/etc. bus probe sem.
4504 * Number of ports registered. Zero on error (no ports registered).
4507 int ata_device_add(const struct ata_probe_ent
*ent
)
4509 unsigned int count
= 0, i
;
4510 struct device
*dev
= ent
->dev
;
4511 struct ata_host_set
*host_set
;
4514 /* alloc a container for our list of ATA ports (buses) */
4515 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4516 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4519 spin_lock_init(&host_set
->lock
);
4521 host_set
->dev
= dev
;
4522 host_set
->n_ports
= ent
->n_ports
;
4523 host_set
->irq
= ent
->irq
;
4524 host_set
->mmio_base
= ent
->mmio_base
;
4525 host_set
->private_data
= ent
->private_data
;
4526 host_set
->ops
= ent
->port_ops
;
4528 /* register each port bound to this device */
4529 for (i
= 0; i
< ent
->n_ports
; i
++) {
4530 struct ata_port
*ap
;
4531 unsigned long xfer_mode_mask
;
4533 ap
= ata_host_add(ent
, host_set
, i
);
4537 host_set
->ports
[i
] = ap
;
4538 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4539 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4540 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4542 /* print per-port info to dmesg */
4543 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4544 "bmdma 0x%lX irq %lu\n",
4546 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4547 ata_mode_string(xfer_mode_mask
),
4548 ap
->ioaddr
.cmd_addr
,
4549 ap
->ioaddr
.ctl_addr
,
4550 ap
->ioaddr
.bmdma_addr
,
4554 host_set
->ops
->irq_clear(ap
);
4561 /* obtain irq, that is shared between channels */
4562 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4563 DRV_NAME
, host_set
))
4566 /* perform each probe synchronously */
4567 DPRINTK("probe begin\n");
4568 for (i
= 0; i
< count
; i
++) {
4569 struct ata_port
*ap
;
4572 ap
= host_set
->ports
[i
];
4574 DPRINTK("ata%u: probe begin\n", ap
->id
);
4575 rc
= ata_bus_probe(ap
);
4576 DPRINTK("ata%u: probe end\n", ap
->id
);
4579 /* FIXME: do something useful here?
4580 * Current libata behavior will
4581 * tear down everything when
4582 * the module is removed
4583 * or the h/w is unplugged.
4587 rc
= scsi_add_host(ap
->host
, dev
);
4589 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4591 /* FIXME: do something useful here */
4592 /* FIXME: handle unconditional calls to
4593 * scsi_scan_host and ata_host_remove, below,
4599 /* probes are done, now scan each port's disk(s) */
4600 DPRINTK("probe begin\n");
4601 for (i
= 0; i
< count
; i
++) {
4602 struct ata_port
*ap
= host_set
->ports
[i
];
4604 ata_scsi_scan_host(ap
);
4607 dev_set_drvdata(dev
, host_set
);
4609 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4610 return ent
->n_ports
; /* success */
4613 for (i
= 0; i
< count
; i
++) {
4614 ata_host_remove(host_set
->ports
[i
], 1);
4615 scsi_host_put(host_set
->ports
[i
]->host
);
4619 VPRINTK("EXIT, returning 0\n");
4624 * ata_host_set_remove - PCI layer callback for device removal
4625 * @host_set: ATA host set that was removed
4627 * Unregister all objects associated with this host set. Free those
4631 * Inherited from calling layer (may sleep).
4634 void ata_host_set_remove(struct ata_host_set
*host_set
)
4636 struct ata_port
*ap
;
4639 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4640 ap
= host_set
->ports
[i
];
4641 scsi_remove_host(ap
->host
);
4644 free_irq(host_set
->irq
, host_set
);
4646 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4647 ap
= host_set
->ports
[i
];
4649 ata_scsi_release(ap
->host
);
4651 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4652 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4654 if (ioaddr
->cmd_addr
== 0x1f0)
4655 release_region(0x1f0, 8);
4656 else if (ioaddr
->cmd_addr
== 0x170)
4657 release_region(0x170, 8);
4660 scsi_host_put(ap
->host
);
4663 if (host_set
->ops
->host_stop
)
4664 host_set
->ops
->host_stop(host_set
);
4670 * ata_scsi_release - SCSI layer callback hook for host unload
4671 * @host: libata host to be unloaded
4673 * Performs all duties necessary to shut down a libata port...
4674 * Kill port kthread, disable port, and release resources.
4677 * Inherited from SCSI layer.
4683 int ata_scsi_release(struct Scsi_Host
*host
)
4685 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4689 ap
->ops
->port_disable(ap
);
4690 ata_host_remove(ap
, 0);
4697 * ata_std_ports - initialize ioaddr with standard port offsets.
4698 * @ioaddr: IO address structure to be initialized
4700 * Utility function which initializes data_addr, error_addr,
4701 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4702 * device_addr, status_addr, and command_addr to standard offsets
4703 * relative to cmd_addr.
4705 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4708 void ata_std_ports(struct ata_ioports
*ioaddr
)
4710 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4711 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4712 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4713 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4714 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4715 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4716 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4717 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4718 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4719 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4722 static struct ata_probe_ent
*
4723 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
4725 struct ata_probe_ent
*probe_ent
;
4727 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4729 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4730 kobject_name(&(dev
->kobj
)));
4734 INIT_LIST_HEAD(&probe_ent
->node
);
4735 probe_ent
->dev
= dev
;
4737 probe_ent
->sht
= port
->sht
;
4738 probe_ent
->host_flags
= port
->host_flags
;
4739 probe_ent
->pio_mask
= port
->pio_mask
;
4740 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4741 probe_ent
->udma_mask
= port
->udma_mask
;
4742 probe_ent
->port_ops
= port
->port_ops
;
4751 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4753 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4755 pci_iounmap(pdev
, host_set
->mmio_base
);
4759 * ata_pci_init_native_mode - Initialize native-mode driver
4760 * @pdev: pci device to be initialized
4761 * @port: array[2] of pointers to port info structures.
4762 * @ports: bitmap of ports present
4764 * Utility function which allocates and initializes an
4765 * ata_probe_ent structure for a standard dual-port
4766 * PIO-based IDE controller. The returned ata_probe_ent
4767 * structure can be passed to ata_device_add(). The returned
4768 * ata_probe_ent structure should then be freed with kfree().
4770 * The caller need only pass the address of the primary port, the
4771 * secondary will be deduced automatically. If the device has non
4772 * standard secondary port mappings this function can be called twice,
4773 * once for each interface.
4776 struct ata_probe_ent
*
4777 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
4779 struct ata_probe_ent
*probe_ent
=
4780 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4786 probe_ent
->irq
= pdev
->irq
;
4787 probe_ent
->irq_flags
= SA_SHIRQ
;
4788 probe_ent
->private_data
= port
[0]->private_data
;
4790 if (ports
& ATA_PORT_PRIMARY
) {
4791 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
4792 probe_ent
->port
[p
].altstatus_addr
=
4793 probe_ent
->port
[p
].ctl_addr
=
4794 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4795 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
4796 ata_std_ports(&probe_ent
->port
[p
]);
4800 if (ports
& ATA_PORT_SECONDARY
) {
4801 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
4802 probe_ent
->port
[p
].altstatus_addr
=
4803 probe_ent
->port
[p
].ctl_addr
=
4804 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4805 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4806 ata_std_ports(&probe_ent
->port
[p
]);
4810 probe_ent
->n_ports
= p
;
4814 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
4816 struct ata_probe_ent
*probe_ent
;
4818 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
4822 probe_ent
->legacy_mode
= 1;
4823 probe_ent
->n_ports
= 1;
4824 probe_ent
->hard_port_no
= port_num
;
4825 probe_ent
->private_data
= port
->private_data
;
4830 probe_ent
->irq
= 14;
4831 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4832 probe_ent
->port
[0].altstatus_addr
=
4833 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4836 probe_ent
->irq
= 15;
4837 probe_ent
->port
[0].cmd_addr
= 0x170;
4838 probe_ent
->port
[0].altstatus_addr
=
4839 probe_ent
->port
[0].ctl_addr
= 0x376;
4842 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
4843 ata_std_ports(&probe_ent
->port
[0]);
4848 * ata_pci_init_one - Initialize/register PCI IDE host controller
4849 * @pdev: Controller to be initialized
4850 * @port_info: Information from low-level host driver
4851 * @n_ports: Number of ports attached to host controller
4853 * This is a helper function which can be called from a driver's
4854 * xxx_init_one() probe function if the hardware uses traditional
4855 * IDE taskfile registers.
4857 * This function calls pci_enable_device(), reserves its register
4858 * regions, sets the dma mask, enables bus master mode, and calls
4862 * Inherited from PCI layer (may sleep).
4865 * Zero on success, negative on errno-based value on error.
4868 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4869 unsigned int n_ports
)
4871 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
4872 struct ata_port_info
*port
[2];
4874 unsigned int legacy_mode
= 0;
4875 int disable_dev_on_err
= 1;
4880 port
[0] = port_info
[0];
4882 port
[1] = port_info
[1];
4886 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4887 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4888 /* TODO: What if one channel is in native mode ... */
4889 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4890 mask
= (1 << 2) | (1 << 0);
4891 if ((tmp8
& mask
) != mask
)
4892 legacy_mode
= (1 << 3);
4896 if ((!legacy_mode
) && (n_ports
> 2)) {
4897 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
4902 /* FIXME: Really for ATA it isn't safe because the device may be
4903 multi-purpose and we want to leave it alone if it was already
4904 enabled. Secondly for shared use as Arjan says we want refcounting
4906 Checking dev->is_enabled is insufficient as this is not set at
4907 boot for the primary video which is BIOS enabled
4910 rc
= pci_enable_device(pdev
);
4914 rc
= pci_request_regions(pdev
, DRV_NAME
);
4916 disable_dev_on_err
= 0;
4920 /* FIXME: Should use platform specific mappers for legacy port ranges */
4922 if (!request_region(0x1f0, 8, "libata")) {
4923 struct resource
*conflict
, res
;
4925 res
.end
= 0x1f0 + 8 - 1;
4926 conflict
= ____request_resource(&ioport_resource
, &res
);
4927 if (!strcmp(conflict
->name
, "libata"))
4928 legacy_mode
|= (1 << 0);
4930 disable_dev_on_err
= 0;
4931 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4934 legacy_mode
|= (1 << 0);
4936 if (!request_region(0x170, 8, "libata")) {
4937 struct resource
*conflict
, res
;
4939 res
.end
= 0x170 + 8 - 1;
4940 conflict
= ____request_resource(&ioport_resource
, &res
);
4941 if (!strcmp(conflict
->name
, "libata"))
4942 legacy_mode
|= (1 << 1);
4944 disable_dev_on_err
= 0;
4945 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4948 legacy_mode
|= (1 << 1);
4951 /* we have legacy mode, but all ports are unavailable */
4952 if (legacy_mode
== (1 << 3)) {
4954 goto err_out_regions
;
4957 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4959 goto err_out_regions
;
4960 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4962 goto err_out_regions
;
4965 if (legacy_mode
& (1 << 0))
4966 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
4967 if (legacy_mode
& (1 << 1))
4968 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
4971 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
4973 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
4975 if (!probe_ent
&& !probe_ent2
) {
4977 goto err_out_regions
;
4980 pci_set_master(pdev
);
4982 /* FIXME: check ata_device_add return */
4984 if (legacy_mode
& (1 << 0))
4985 ata_device_add(probe_ent
);
4986 if (legacy_mode
& (1 << 1))
4987 ata_device_add(probe_ent2
);
4989 ata_device_add(probe_ent
);
4997 if (legacy_mode
& (1 << 0))
4998 release_region(0x1f0, 8);
4999 if (legacy_mode
& (1 << 1))
5000 release_region(0x170, 8);
5001 pci_release_regions(pdev
);
5003 if (disable_dev_on_err
)
5004 pci_disable_device(pdev
);
5009 * ata_pci_remove_one - PCI layer callback for device removal
5010 * @pdev: PCI device that was removed
5012 * PCI layer indicates to libata via this hook that
5013 * hot-unplug or module unload event has occurred.
5014 * Handle this by unregistering all objects associated
5015 * with this PCI device. Free those objects. Then finally
5016 * release PCI resources and disable device.
5019 * Inherited from PCI layer (may sleep).
5022 void ata_pci_remove_one (struct pci_dev
*pdev
)
5024 struct device
*dev
= pci_dev_to_dev(pdev
);
5025 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5027 ata_host_set_remove(host_set
);
5028 pci_release_regions(pdev
);
5029 pci_disable_device(pdev
);
5030 dev_set_drvdata(dev
, NULL
);
5033 /* move to PCI subsystem */
5034 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5036 unsigned long tmp
= 0;
5038 switch (bits
->width
) {
5041 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5047 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5053 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5064 return (tmp
== bits
->val
) ? 1 : 0;
5067 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5069 pci_save_state(pdev
);
5070 pci_disable_device(pdev
);
5071 pci_set_power_state(pdev
, PCI_D3hot
);
5075 int ata_pci_device_resume(struct pci_dev
*pdev
)
5077 pci_set_power_state(pdev
, PCI_D0
);
5078 pci_restore_state(pdev
);
5079 pci_enable_device(pdev
);
5080 pci_set_master(pdev
);
5083 #endif /* CONFIG_PCI */
5086 static int __init
ata_init(void)
5088 ata_wq
= create_workqueue("ata");
5092 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5096 static void __exit
ata_exit(void)
5098 destroy_workqueue(ata_wq
);
5101 module_init(ata_init
);
5102 module_exit(ata_exit
);
5104 static unsigned long ratelimit_time
;
5105 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5107 int ata_ratelimit(void)
5110 unsigned long flags
;
5112 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5114 if (time_after(jiffies
, ratelimit_time
)) {
5116 ratelimit_time
= jiffies
+ (HZ
/5);
5120 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5126 * libata is essentially a library of internal helper functions for
5127 * low-level ATA host controller drivers. As such, the API/ABI is
5128 * likely to change as new drivers are added and updated.
5129 * Do not depend on ABI/API stability.
5132 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5133 EXPORT_SYMBOL_GPL(ata_std_ports
);
5134 EXPORT_SYMBOL_GPL(ata_device_add
);
5135 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5136 EXPORT_SYMBOL_GPL(ata_sg_init
);
5137 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5138 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5139 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5140 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5141 EXPORT_SYMBOL_GPL(ata_tf_load
);
5142 EXPORT_SYMBOL_GPL(ata_tf_read
);
5143 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5144 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5145 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5146 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5147 EXPORT_SYMBOL_GPL(ata_check_status
);
5148 EXPORT_SYMBOL_GPL(ata_altstatus
);
5149 EXPORT_SYMBOL_GPL(ata_exec_command
);
5150 EXPORT_SYMBOL_GPL(ata_port_start
);
5151 EXPORT_SYMBOL_GPL(ata_port_stop
);
5152 EXPORT_SYMBOL_GPL(ata_host_stop
);
5153 EXPORT_SYMBOL_GPL(ata_interrupt
);
5154 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5155 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5156 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5157 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5158 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5159 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5160 EXPORT_SYMBOL_GPL(ata_port_probe
);
5161 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5162 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5163 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5164 EXPORT_SYMBOL_GPL(ata_port_disable
);
5165 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5166 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5167 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5168 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5169 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5170 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5171 EXPORT_SYMBOL_GPL(ata_host_intr
);
5172 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5173 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5174 EXPORT_SYMBOL_GPL(ata_dev_config
);
5175 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5177 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5178 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5179 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5182 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5183 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5184 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5185 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5186 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5187 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5188 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5189 #endif /* CONFIG_PCI */
5191 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5192 EXPORT_SYMBOL_GPL(ata_device_resume
);
5193 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5194 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);