2 #include <linux/kernel.h>
4 #include <linux/delay.h>
6 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
,
9 ide_hwif_t
*hwif
= drive
->hwif
;
11 if ((stat
& ATA_BUSY
) ||
12 ((stat
& ATA_DF
) && (drive
->dev_flags
& IDE_DFLAG_NOWERR
) == 0)) {
13 /* other bits are useless when BUSY */
14 rq
->errors
|= ERROR_RESET
;
15 } else if (stat
& ATA_ERR
) {
16 /* err has different meaning on cdrom and tape */
17 if (err
== ATA_ABORTED
) {
18 if ((drive
->dev_flags
& IDE_DFLAG_LBA
) &&
19 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
20 hwif
->tp_ops
->read_status(hwif
) == ATA_CMD_INIT_DEV_PARAMS
)
22 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
23 /* UDMA crc error, just retry the operation */
25 } else if (err
& (ATA_BBK
| ATA_UNC
)) {
26 /* retries won't help these */
27 rq
->errors
= ERROR_MAX
;
28 } else if (err
& ATA_TRK0NF
) {
29 /* help it find track zero */
30 rq
->errors
|= ERROR_RECAL
;
34 if ((stat
& ATA_DRQ
) && rq_data_dir(rq
) == READ
&&
35 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0) {
36 int nsect
= drive
->mult_count
? drive
->mult_count
: 1;
38 ide_pad_transfer(drive
, READ
, nsect
* SECTOR_SIZE
);
41 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
42 ide_kill_rq(drive
, rq
);
46 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
47 rq
->errors
|= ERROR_RESET
;
49 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
51 return ide_do_reset(drive
);
54 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
55 drive
->special
.b
.recalibrate
= 1;
62 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
,
65 ide_hwif_t
*hwif
= drive
->hwif
;
67 if ((stat
& ATA_BUSY
) ||
68 ((stat
& ATA_DF
) && (drive
->dev_flags
& IDE_DFLAG_NOWERR
) == 0)) {
69 /* other bits are useless when BUSY */
70 rq
->errors
|= ERROR_RESET
;
72 /* add decoding error stuff */
75 if (hwif
->tp_ops
->read_status(hwif
) & (ATA_BUSY
| ATA_DRQ
))
77 hwif
->tp_ops
->exec_command(hwif
, ATA_CMD_IDLEIMMEDIATE
);
79 if (rq
->errors
>= ERROR_MAX
) {
80 ide_kill_rq(drive
, rq
);
82 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
84 return ide_do_reset(drive
);
92 static ide_startstop_t
__ide_error(ide_drive_t
*drive
, struct request
*rq
,
95 if (drive
->media
== ide_disk
)
96 return ide_ata_error(drive
, rq
, stat
, err
);
97 return ide_atapi_error(drive
, rq
, stat
, err
);
101 * ide_error - handle an error on the IDE
102 * @drive: drive the error occurred on
103 * @msg: message to report
106 * ide_error() takes action based on the error returned by the drive.
107 * For normal I/O that may well include retries. We deal with
108 * both new-style (taskfile) and old style command handling here.
109 * In the case of taskfile command handling there is work left to
113 ide_startstop_t
ide_error(ide_drive_t
*drive
, const char *msg
, u8 stat
)
118 err
= ide_dump_status(drive
, msg
, stat
);
120 rq
= drive
->hwif
->rq
;
124 /* retry only "normal" I/O: */
125 if (!blk_fs_request(rq
)) {
126 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
127 struct ide_cmd
*cmd
= rq
->special
;
130 ide_complete_cmd(drive
, cmd
, stat
, err
);
131 } else if (blk_pm_request(rq
)) {
133 ide_complete_pm_rq(drive
, rq
);
137 ide_complete_rq(drive
, err
? -EIO
: 0);
141 return __ide_error(drive
, rq
, stat
, err
);
143 EXPORT_SYMBOL_GPL(ide_error
);
145 static inline void ide_complete_drive_reset(ide_drive_t
*drive
, int err
)
147 struct request
*rq
= drive
->hwif
->rq
;
149 if (rq
&& blk_special_request(rq
) && rq
->cmd
[0] == REQ_DRIVE_RESET
)
150 ide_end_request(drive
, err
? err
: 1, 0);
154 static ide_startstop_t
do_reset1(ide_drive_t
*, int);
157 * atapi_reset_pollfunc() gets invoked to poll the interface for completion
158 * every 50ms during an atapi drive reset operation. If the drive has not yet
159 * responded, and we have not yet hit our maximum waiting time, then the timer
160 * is restarted for another 50ms.
162 static ide_startstop_t
atapi_reset_pollfunc(ide_drive_t
*drive
)
164 ide_hwif_t
*hwif
= drive
->hwif
;
169 stat
= hwif
->tp_ops
->read_status(hwif
);
171 if (OK_STAT(stat
, 0, ATA_BUSY
))
172 printk(KERN_INFO
"%s: ATAPI reset complete\n", drive
->name
);
174 if (time_before(jiffies
, hwif
->poll_timeout
)) {
175 ide_set_handler(drive
, &atapi_reset_pollfunc
, HZ
/20,
177 /* continue polling */
182 printk(KERN_ERR
"%s: ATAPI reset timed-out, status=0x%02x\n",
184 /* do it the old fashioned way */
185 return do_reset1(drive
, 1);
189 ide_complete_drive_reset(drive
, 0);
193 static void ide_reset_report_error(ide_hwif_t
*hwif
, u8 err
)
195 static const char *err_master_vals
[] =
196 { NULL
, "passed", "formatter device error",
197 "sector buffer error", "ECC circuitry error",
198 "controlling MPU error" };
200 u8 err_master
= err
& 0x7f;
202 printk(KERN_ERR
"%s: reset: master: ", hwif
->name
);
203 if (err_master
&& err_master
< 6)
204 printk(KERN_CONT
"%s", err_master_vals
[err_master
]);
206 printk(KERN_CONT
"error (0x%02x?)", err
);
208 printk(KERN_CONT
"; slave: failed");
209 printk(KERN_CONT
"\n");
213 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
214 * during an ide reset operation. If the drives have not yet responded,
215 * and we have not yet hit our maximum waiting time, then the timer is restarted
218 static ide_startstop_t
reset_pollfunc(ide_drive_t
*drive
)
220 ide_hwif_t
*hwif
= drive
->hwif
;
221 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
225 if (port_ops
&& port_ops
->reset_poll
) {
226 err
= port_ops
->reset_poll(drive
);
228 printk(KERN_ERR
"%s: host reset_poll failure for %s.\n",
229 hwif
->name
, drive
->name
);
234 tmp
= hwif
->tp_ops
->read_status(hwif
);
236 if (!OK_STAT(tmp
, 0, ATA_BUSY
)) {
237 if (time_before(jiffies
, hwif
->poll_timeout
)) {
238 ide_set_handler(drive
, &reset_pollfunc
, HZ
/20, NULL
);
239 /* continue polling */
242 printk(KERN_ERR
"%s: reset timed-out, status=0x%02x\n",
247 tmp
= ide_read_error(drive
);
250 printk(KERN_INFO
"%s: reset: success\n", hwif
->name
);
253 ide_reset_report_error(hwif
, tmp
);
259 hwif
->polling
= 0; /* done polling */
260 ide_complete_drive_reset(drive
, err
);
264 static void ide_disk_pre_reset(ide_drive_t
*drive
)
266 int legacy
= (drive
->id
[ATA_ID_CFS_ENABLE_2
] & 0x0400) ? 0 : 1;
268 drive
->special
.all
= 0;
269 drive
->special
.b
.set_geometry
= legacy
;
270 drive
->special
.b
.recalibrate
= legacy
;
272 drive
->mult_count
= 0;
273 drive
->dev_flags
&= ~IDE_DFLAG_PARKED
;
275 if ((drive
->dev_flags
& IDE_DFLAG_KEEP_SETTINGS
) == 0 &&
276 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) == 0)
279 if (drive
->mult_req
!= drive
->mult_count
)
280 drive
->special
.b
.set_multmode
= 1;
283 static void pre_reset(ide_drive_t
*drive
)
285 const struct ide_port_ops
*port_ops
= drive
->hwif
->port_ops
;
287 if (drive
->media
== ide_disk
)
288 ide_disk_pre_reset(drive
);
290 drive
->dev_flags
|= IDE_DFLAG_POST_RESET
;
292 if (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) {
293 if (drive
->crc_count
)
294 ide_check_dma_crc(drive
);
299 if ((drive
->dev_flags
& IDE_DFLAG_KEEP_SETTINGS
) == 0) {
300 if ((drive
->dev_flags
& IDE_DFLAG_USING_DMA
) == 0) {
301 drive
->dev_flags
&= ~IDE_DFLAG_UNMASK
;
307 if (port_ops
&& port_ops
->pre_reset
)
308 port_ops
->pre_reset(drive
);
310 if (drive
->current_speed
!= 0xff)
311 drive
->desired_speed
= drive
->current_speed
;
312 drive
->current_speed
= 0xff;
316 * do_reset1() attempts to recover a confused drive by resetting it.
317 * Unfortunately, resetting a disk drive actually resets all devices on
318 * the same interface, so it can really be thought of as resetting the
319 * interface rather than resetting the drive.
321 * ATAPI devices have their own reset mechanism which allows them to be
322 * individually reset without clobbering other devices on the same interface.
324 * Unfortunately, the IDE interface does not generate an interrupt to let
325 * us know when the reset operation has finished, so we must poll for this.
326 * Equally poor, though, is the fact that this may a very long time to complete,
327 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
328 * we set a timer to poll at 50ms intervals.
330 static ide_startstop_t
do_reset1(ide_drive_t
*drive
, int do_not_try_atapi
)
332 ide_hwif_t
*hwif
= drive
->hwif
;
333 struct ide_io_ports
*io_ports
= &hwif
->io_ports
;
334 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
335 const struct ide_port_ops
*port_ops
;
337 unsigned long flags
, timeout
;
341 spin_lock_irqsave(&hwif
->lock
, flags
);
343 /* We must not reset with running handlers */
344 BUG_ON(hwif
->handler
!= NULL
);
346 /* For an ATAPI device, first try an ATAPI SRST. */
347 if (drive
->media
!= ide_disk
&& !do_not_try_atapi
) {
351 tp_ops
->exec_command(hwif
, ATA_CMD_DEV_RESET
);
353 hwif
->poll_timeout
= jiffies
+ WAIT_WORSTCASE
;
355 __ide_set_handler(drive
, &atapi_reset_pollfunc
, HZ
/20, NULL
);
356 spin_unlock_irqrestore(&hwif
->lock
, flags
);
360 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
364 prepare_to_wait(&ide_park_wq
, &wait
, TASK_UNINTERRUPTIBLE
);
366 ide_port_for_each_present_dev(i
, tdrive
, hwif
) {
367 if ((tdrive
->dev_flags
& IDE_DFLAG_PARKED
) &&
368 time_after(tdrive
->sleep
, timeout
))
369 timeout
= tdrive
->sleep
;
373 if (time_before_eq(timeout
, now
))
376 spin_unlock_irqrestore(&hwif
->lock
, flags
);
377 timeout
= schedule_timeout_uninterruptible(timeout
- now
);
378 spin_lock_irqsave(&hwif
->lock
, flags
);
380 finish_wait(&ide_park_wq
, &wait
);
383 * First, reset any device state data we were maintaining
384 * for any of the drives on this interface.
386 ide_port_for_each_dev(i
, tdrive
, hwif
)
389 if (io_ports
->ctl_addr
== 0) {
390 spin_unlock_irqrestore(&hwif
->lock
, flags
);
391 ide_complete_drive_reset(drive
, -ENXIO
);
396 * Note that we also set nIEN while resetting the device,
397 * to mask unwanted interrupts from the interface during the reset.
398 * However, due to the design of PC hardware, this will cause an
399 * immediate interrupt due to the edge transition it produces.
400 * This single interrupt gives us a "fast poll" for drives that
401 * recover from reset very quickly, saving us the first 50ms wait time.
403 * TODO: add ->softreset method and stop abusing ->set_irq
405 /* set SRST and nIEN */
406 tp_ops
->set_irq(hwif
, 4);
407 /* more than enough time */
409 /* clear SRST, leave nIEN (unless device is on the quirk list) */
410 tp_ops
->set_irq(hwif
, drive
->quirk_list
== 2);
411 /* more than enough time */
413 hwif
->poll_timeout
= jiffies
+ WAIT_WORSTCASE
;
415 __ide_set_handler(drive
, &reset_pollfunc
, HZ
/20, NULL
);
418 * Some weird controller like resetting themselves to a strange
419 * state when the disks are reset this way. At least, the Winbond
420 * 553 documentation says that
422 port_ops
= hwif
->port_ops
;
423 if (port_ops
&& port_ops
->resetproc
)
424 port_ops
->resetproc(drive
);
426 spin_unlock_irqrestore(&hwif
->lock
, flags
);
431 * ide_do_reset() is the entry point to the drive/interface reset code.
434 ide_startstop_t
ide_do_reset(ide_drive_t
*drive
)
436 return do_reset1(drive
, 0);
438 EXPORT_SYMBOL(ide_do_reset
);