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
)) {
127 ide_end_drive_cmd(drive
, stat
, err
);
131 return __ide_error(drive
, rq
, stat
, err
);
133 EXPORT_SYMBOL_GPL(ide_error
);
135 static inline void ide_complete_drive_reset(ide_drive_t
*drive
, int err
)
137 struct request
*rq
= drive
->hwif
->rq
;
139 if (rq
&& blk_special_request(rq
) && rq
->cmd
[0] == REQ_DRIVE_RESET
)
140 ide_end_request(drive
, err
? err
: 1, 0);
144 static ide_startstop_t
do_reset1(ide_drive_t
*, int);
147 * atapi_reset_pollfunc() gets invoked to poll the interface for completion
148 * every 50ms during an atapi drive reset operation. If the drive has not yet
149 * responded, and we have not yet hit our maximum waiting time, then the timer
150 * is restarted for another 50ms.
152 static ide_startstop_t
atapi_reset_pollfunc(ide_drive_t
*drive
)
154 ide_hwif_t
*hwif
= drive
->hwif
;
159 stat
= hwif
->tp_ops
->read_status(hwif
);
161 if (OK_STAT(stat
, 0, ATA_BUSY
))
162 printk(KERN_INFO
"%s: ATAPI reset complete\n", drive
->name
);
164 if (time_before(jiffies
, hwif
->poll_timeout
)) {
165 ide_set_handler(drive
, &atapi_reset_pollfunc
, HZ
/20,
167 /* continue polling */
172 printk(KERN_ERR
"%s: ATAPI reset timed-out, status=0x%02x\n",
174 /* do it the old fashioned way */
175 return do_reset1(drive
, 1);
179 ide_complete_drive_reset(drive
, 0);
183 static void ide_reset_report_error(ide_hwif_t
*hwif
, u8 err
)
185 static const char *err_master_vals
[] =
186 { NULL
, "passed", "formatter device error",
187 "sector buffer error", "ECC circuitry error",
188 "controlling MPU error" };
190 u8 err_master
= err
& 0x7f;
192 printk(KERN_ERR
"%s: reset: master: ", hwif
->name
);
193 if (err_master
&& err_master
< 6)
194 printk(KERN_CONT
"%s", err_master_vals
[err_master
]);
196 printk(KERN_CONT
"error (0x%02x?)", err
);
198 printk(KERN_CONT
"; slave: failed");
199 printk(KERN_CONT
"\n");
203 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
204 * during an ide reset operation. If the drives have not yet responded,
205 * and we have not yet hit our maximum waiting time, then the timer is restarted
208 static ide_startstop_t
reset_pollfunc(ide_drive_t
*drive
)
210 ide_hwif_t
*hwif
= drive
->hwif
;
211 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
215 if (port_ops
&& port_ops
->reset_poll
) {
216 err
= port_ops
->reset_poll(drive
);
218 printk(KERN_ERR
"%s: host reset_poll failure for %s.\n",
219 hwif
->name
, drive
->name
);
224 tmp
= hwif
->tp_ops
->read_status(hwif
);
226 if (!OK_STAT(tmp
, 0, ATA_BUSY
)) {
227 if (time_before(jiffies
, hwif
->poll_timeout
)) {
228 ide_set_handler(drive
, &reset_pollfunc
, HZ
/20, NULL
);
229 /* continue polling */
232 printk(KERN_ERR
"%s: reset timed-out, status=0x%02x\n",
237 tmp
= ide_read_error(drive
);
240 printk(KERN_INFO
"%s: reset: success\n", hwif
->name
);
243 ide_reset_report_error(hwif
, tmp
);
249 hwif
->polling
= 0; /* done polling */
250 ide_complete_drive_reset(drive
, err
);
254 static void ide_disk_pre_reset(ide_drive_t
*drive
)
256 int legacy
= (drive
->id
[ATA_ID_CFS_ENABLE_2
] & 0x0400) ? 0 : 1;
258 drive
->special
.all
= 0;
259 drive
->special
.b
.set_geometry
= legacy
;
260 drive
->special
.b
.recalibrate
= legacy
;
262 drive
->mult_count
= 0;
263 drive
->dev_flags
&= ~IDE_DFLAG_PARKED
;
265 if ((drive
->dev_flags
& IDE_DFLAG_KEEP_SETTINGS
) == 0 &&
266 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) == 0)
269 if (drive
->mult_req
!= drive
->mult_count
)
270 drive
->special
.b
.set_multmode
= 1;
273 static void pre_reset(ide_drive_t
*drive
)
275 const struct ide_port_ops
*port_ops
= drive
->hwif
->port_ops
;
277 if (drive
->media
== ide_disk
)
278 ide_disk_pre_reset(drive
);
280 drive
->dev_flags
|= IDE_DFLAG_POST_RESET
;
282 if (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) {
283 if (drive
->crc_count
)
284 ide_check_dma_crc(drive
);
289 if ((drive
->dev_flags
& IDE_DFLAG_KEEP_SETTINGS
) == 0) {
290 if ((drive
->dev_flags
& IDE_DFLAG_USING_DMA
) == 0) {
291 drive
->dev_flags
&= ~IDE_DFLAG_UNMASK
;
297 if (port_ops
&& port_ops
->pre_reset
)
298 port_ops
->pre_reset(drive
);
300 if (drive
->current_speed
!= 0xff)
301 drive
->desired_speed
= drive
->current_speed
;
302 drive
->current_speed
= 0xff;
306 * do_reset1() attempts to recover a confused drive by resetting it.
307 * Unfortunately, resetting a disk drive actually resets all devices on
308 * the same interface, so it can really be thought of as resetting the
309 * interface rather than resetting the drive.
311 * ATAPI devices have their own reset mechanism which allows them to be
312 * individually reset without clobbering other devices on the same interface.
314 * Unfortunately, the IDE interface does not generate an interrupt to let
315 * us know when the reset operation has finished, so we must poll for this.
316 * Equally poor, though, is the fact that this may a very long time to complete,
317 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
318 * we set a timer to poll at 50ms intervals.
320 static ide_startstop_t
do_reset1(ide_drive_t
*drive
, int do_not_try_atapi
)
322 ide_hwif_t
*hwif
= drive
->hwif
;
323 struct ide_io_ports
*io_ports
= &hwif
->io_ports
;
324 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
325 const struct ide_port_ops
*port_ops
;
327 unsigned long flags
, timeout
;
331 spin_lock_irqsave(&hwif
->lock
, flags
);
333 /* We must not reset with running handlers */
334 BUG_ON(hwif
->handler
!= NULL
);
336 /* For an ATAPI device, first try an ATAPI SRST. */
337 if (drive
->media
!= ide_disk
&& !do_not_try_atapi
) {
341 tp_ops
->exec_command(hwif
, ATA_CMD_DEV_RESET
);
343 hwif
->poll_timeout
= jiffies
+ WAIT_WORSTCASE
;
345 __ide_set_handler(drive
, &atapi_reset_pollfunc
, HZ
/20, NULL
);
346 spin_unlock_irqrestore(&hwif
->lock
, flags
);
350 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */
354 prepare_to_wait(&ide_park_wq
, &wait
, TASK_UNINTERRUPTIBLE
);
356 ide_port_for_each_present_dev(i
, tdrive
, hwif
) {
357 if ((tdrive
->dev_flags
& IDE_DFLAG_PARKED
) &&
358 time_after(tdrive
->sleep
, timeout
))
359 timeout
= tdrive
->sleep
;
363 if (time_before_eq(timeout
, now
))
366 spin_unlock_irqrestore(&hwif
->lock
, flags
);
367 timeout
= schedule_timeout_uninterruptible(timeout
- now
);
368 spin_lock_irqsave(&hwif
->lock
, flags
);
370 finish_wait(&ide_park_wq
, &wait
);
373 * First, reset any device state data we were maintaining
374 * for any of the drives on this interface.
376 ide_port_for_each_dev(i
, tdrive
, hwif
)
379 if (io_ports
->ctl_addr
== 0) {
380 spin_unlock_irqrestore(&hwif
->lock
, flags
);
381 ide_complete_drive_reset(drive
, -ENXIO
);
386 * Note that we also set nIEN while resetting the device,
387 * to mask unwanted interrupts from the interface during the reset.
388 * However, due to the design of PC hardware, this will cause an
389 * immediate interrupt due to the edge transition it produces.
390 * This single interrupt gives us a "fast poll" for drives that
391 * recover from reset very quickly, saving us the first 50ms wait time.
393 * TODO: add ->softreset method and stop abusing ->set_irq
395 /* set SRST and nIEN */
396 tp_ops
->set_irq(hwif
, 4);
397 /* more than enough time */
399 /* clear SRST, leave nIEN (unless device is on the quirk list) */
400 tp_ops
->set_irq(hwif
, drive
->quirk_list
== 2);
401 /* more than enough time */
403 hwif
->poll_timeout
= jiffies
+ WAIT_WORSTCASE
;
405 __ide_set_handler(drive
, &reset_pollfunc
, HZ
/20, NULL
);
408 * Some weird controller like resetting themselves to a strange
409 * state when the disks are reset this way. At least, the Winbond
410 * 553 documentation says that
412 port_ops
= hwif
->port_ops
;
413 if (port_ops
&& port_ops
->resetproc
)
414 port_ops
->resetproc(drive
);
416 spin_unlock_irqrestore(&hwif
->lock
, flags
);
421 * ide_do_reset() is the entry point to the drive/interface reset code.
424 ide_startstop_t
ide_do_reset(ide_drive_t
*drive
)
426 return do_reset1(drive
, 0);
428 EXPORT_SYMBOL(ide_do_reset
);