1
2#include <linux/kernel.h>
3#include <linux/export.h>
4#include <linux/ide.h>
5#include <linux/delay.h>
6
7static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq,
8				     u8 stat, u8 err)
9{
10	ide_hwif_t *hwif = drive->hwif;
11
12	if ((stat & ATA_BUSY) ||
13	    ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
14		/* other bits are useless when BUSY */
15		rq->errors |= ERROR_RESET;
16	} else if (stat & ATA_ERR) {
17		/* err has different meaning on cdrom and tape */
18		if (err == ATA_ABORTED) {
19			if ((drive->dev_flags & IDE_DFLAG_LBA) &&
20			    /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
21			    hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
22				return ide_stopped;
23		} else if ((err & BAD_CRC) == BAD_CRC) {
24			/* UDMA crc error, just retry the operation */
25			drive->crc_count++;
26		} else if (err & (ATA_BBK | ATA_UNC)) {
27			/* retries won't help these */
28			rq->errors = ERROR_MAX;
29		} else if (err & ATA_TRK0NF) {
30			/* help it find track zero */
31			rq->errors |= ERROR_RECAL;
32		}
33	}
34
35	if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
36	    (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
37		int nsect = drive->mult_count ? drive->mult_count : 1;
38
39		ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
40	}
41
42	if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
43		ide_kill_rq(drive, rq);
44		return ide_stopped;
45	}
46
47	if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
48		rq->errors |= ERROR_RESET;
49
50	if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
51		++rq->errors;
52		return ide_do_reset(drive);
53	}
54
55	if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
56		drive->special_flags |= IDE_SFLAG_RECALIBRATE;
57
58	++rq->errors;
59
60	return ide_stopped;
61}
62
63static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq,
64				       u8 stat, u8 err)
65{
66	ide_hwif_t *hwif = drive->hwif;
67
68	if ((stat & ATA_BUSY) ||
69	    ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
70		/* other bits are useless when BUSY */
71		rq->errors |= ERROR_RESET;
72	} else {
73		/* add decoding error stuff */
74	}
75
76	if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
77		/* force an abort */
78		hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
79
80	if (rq->errors >= ERROR_MAX) {
81		ide_kill_rq(drive, rq);
82	} else {
83		if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
84			++rq->errors;
85			return ide_do_reset(drive);
86		}
87		++rq->errors;
88	}
89
90	return ide_stopped;
91}
92
93static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq,
94				   u8 stat, u8 err)
95{
96	if (drive->media == ide_disk)
97		return ide_ata_error(drive, rq, stat, err);
98	return ide_atapi_error(drive, rq, stat, err);
99}
100
101/**
102 *	ide_error	-	handle an error on the IDE
103 *	@drive: drive the error occurred on
104 *	@msg: message to report
105 *	@stat: status bits
106 *
107 *	ide_error() takes action based on the error returned by the drive.
108 *	For normal I/O that may well include retries. We deal with
109 *	both new-style (taskfile) and old style command handling here.
110 *	In the case of taskfile command handling there is work left to
111 *	do
112 */
113
114ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat)
115{
116	struct request *rq;
117	u8 err;
118
119	err = ide_dump_status(drive, msg, stat);
120
121	rq = drive->hwif->rq;
122	if (rq == NULL)
123		return ide_stopped;
124
125	/* retry only "normal" I/O: */
126	if (rq->cmd_type != REQ_TYPE_FS) {
127		if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
128			struct ide_cmd *cmd = rq->special;
129
130			if (cmd)
131				ide_complete_cmd(drive, cmd, stat, err);
132		} else if (blk_pm_request(rq)) {
133			rq->errors = 1;
134			ide_complete_pm_rq(drive, rq);
135			return ide_stopped;
136		}
137		rq->errors = err;
138		ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq));
139		return ide_stopped;
140	}
141
142	return __ide_error(drive, rq, stat, err);
143}
144EXPORT_SYMBOL_GPL(ide_error);
145
146static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
147{
148	struct request *rq = drive->hwif->rq;
149
150	if (rq && rq->cmd_type == REQ_TYPE_SPECIAL &&
151	    rq->cmd[0] == REQ_DRIVE_RESET) {
152		if (err <= 0 && rq->errors == 0)
153			rq->errors = -EIO;
154		ide_complete_rq(drive, err ? err : 0, blk_rq_bytes(rq));
155	}
156}
157
158/* needed below */
159static ide_startstop_t do_reset1(ide_drive_t *, int);
160
161/*
162 * atapi_reset_pollfunc() gets invoked to poll the interface for completion
163 * every 50ms during an atapi drive reset operation.  If the drive has not yet
164 * responded, and we have not yet hit our maximum waiting time, then the timer
165 * is restarted for another 50ms.
166 */
167static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
168{
169	ide_hwif_t *hwif = drive->hwif;
170	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
171	u8 stat;
172
173	tp_ops->dev_select(drive);
174	udelay(10);
175	stat = tp_ops->read_status(hwif);
176
177	if (OK_STAT(stat, 0, ATA_BUSY))
178		printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
179	else {
180		if (time_before(jiffies, hwif->poll_timeout)) {
181			ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
182			/* continue polling */
183			return ide_started;
184		}
185		/* end of polling */
186		hwif->polling = 0;
187		printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
188			drive->name, stat);
189		/* do it the old fashioned way */
190		return do_reset1(drive, 1);
191	}
192	/* done polling */
193	hwif->polling = 0;
194	ide_complete_drive_reset(drive, 0);
195	return ide_stopped;
196}
197
198static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
199{
200	static const char *err_master_vals[] =
201		{ NULL, "passed", "formatter device error",
202		  "sector buffer error", "ECC circuitry error",
203		  "controlling MPU error" };
204
205	u8 err_master = err & 0x7f;
206
207	printk(KERN_ERR "%s: reset: master: ", hwif->name);
208	if (err_master && err_master < 6)
209		printk(KERN_CONT "%s", err_master_vals[err_master]);
210	else
211		printk(KERN_CONT "error (0x%02x?)", err);
212	if (err & 0x80)
213		printk(KERN_CONT "; slave: failed");
214	printk(KERN_CONT "\n");
215}
216
217/*
218 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
219 * during an ide reset operation. If the drives have not yet responded,
220 * and we have not yet hit our maximum waiting time, then the timer is restarted
221 * for another 50ms.
222 */
223static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
224{
225	ide_hwif_t *hwif = drive->hwif;
226	const struct ide_port_ops *port_ops = hwif->port_ops;
227	u8 tmp;
228	int err = 0;
229
230	if (port_ops && port_ops->reset_poll) {
231		err = port_ops->reset_poll(drive);
232		if (err) {
233			printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
234				hwif->name, drive->name);
235			goto out;
236		}
237	}
238
239	tmp = hwif->tp_ops->read_status(hwif);
240
241	if (!OK_STAT(tmp, 0, ATA_BUSY)) {
242		if (time_before(jiffies, hwif->poll_timeout)) {
243			ide_set_handler(drive, &reset_pollfunc, HZ/20);
244			/* continue polling */
245			return ide_started;
246		}
247		printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
248			hwif->name, tmp);
249		drive->failures++;
250		err = -EIO;
251	} else  {
252		tmp = ide_read_error(drive);
253
254		if (tmp == 1) {
255			printk(KERN_INFO "%s: reset: success\n", hwif->name);
256			drive->failures = 0;
257		} else {
258			ide_reset_report_error(hwif, tmp);
259			drive->failures++;
260			err = -EIO;
261		}
262	}
263out:
264	hwif->polling = 0;	/* done polling */
265	ide_complete_drive_reset(drive, err);
266	return ide_stopped;
267}
268
269static void ide_disk_pre_reset(ide_drive_t *drive)
270{
271	int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
272
273	drive->special_flags =
274		legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0;
275
276	drive->mult_count = 0;
277	drive->dev_flags &= ~IDE_DFLAG_PARKED;
278
279	if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
280	    (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
281		drive->mult_req = 0;
282
283	if (drive->mult_req != drive->mult_count)
284		drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
285}
286
287static void pre_reset(ide_drive_t *drive)
288{
289	const struct ide_port_ops *port_ops = drive->hwif->port_ops;
290
291	if (drive->media == ide_disk)
292		ide_disk_pre_reset(drive);
293	else
294		drive->dev_flags |= IDE_DFLAG_POST_RESET;
295
296	if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
297		if (drive->crc_count)
298			ide_check_dma_crc(drive);
299		else
300			ide_dma_off(drive);
301	}
302
303	if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
304		if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
305			drive->dev_flags &= ~IDE_DFLAG_UNMASK;
306			drive->io_32bit = 0;
307		}
308		return;
309	}
310
311	if (port_ops && port_ops->pre_reset)
312		port_ops->pre_reset(drive);
313
314	if (drive->current_speed != 0xff)
315		drive->desired_speed = drive->current_speed;
316	drive->current_speed = 0xff;
317}
318
319/*
320 * do_reset1() attempts to recover a confused drive by resetting it.
321 * Unfortunately, resetting a disk drive actually resets all devices on
322 * the same interface, so it can really be thought of as resetting the
323 * interface rather than resetting the drive.
324 *
325 * ATAPI devices have their own reset mechanism which allows them to be
326 * individually reset without clobbering other devices on the same interface.
327 *
328 * Unfortunately, the IDE interface does not generate an interrupt to let
329 * us know when the reset operation has finished, so we must poll for this.
330 * Equally poor, though, is the fact that this may a very long time to complete,
331 * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
332 * we set a timer to poll at 50ms intervals.
333 */
334static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
335{
336	ide_hwif_t *hwif = drive->hwif;
337	struct ide_io_ports *io_ports = &hwif->io_ports;
338	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
339	const struct ide_port_ops *port_ops;
340	ide_drive_t *tdrive;
341	unsigned long flags, timeout;
342	int i;
343	DEFINE_WAIT(wait);
344
345	spin_lock_irqsave(&hwif->lock, flags);
346
347	/* We must not reset with running handlers */
348	BUG_ON(hwif->handler != NULL);
349
350	/* For an ATAPI device, first try an ATAPI SRST. */
351	if (drive->media != ide_disk && !do_not_try_atapi) {
352		pre_reset(drive);
353		tp_ops->dev_select(drive);
354		udelay(20);
355		tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
356		ndelay(400);
357		hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
358		hwif->polling = 1;
359		__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
360		spin_unlock_irqrestore(&hwif->lock, flags);
361		return ide_started;
362	}
363
364	/* We must not disturb devices in the IDE_DFLAG_PARKED state. */
365	do {
366		unsigned long now;
367
368		prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
369		timeout = jiffies;
370		ide_port_for_each_present_dev(i, tdrive, hwif) {
371			if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
372			    time_after(tdrive->sleep, timeout))
373				timeout = tdrive->sleep;
374		}
375
376		now = jiffies;
377		if (time_before_eq(timeout, now))
378			break;
379
380		spin_unlock_irqrestore(&hwif->lock, flags);
381		timeout = schedule_timeout_uninterruptible(timeout - now);
382		spin_lock_irqsave(&hwif->lock, flags);
383	} while (timeout);
384	finish_wait(&ide_park_wq, &wait);
385
386	/*
387	 * First, reset any device state data we were maintaining
388	 * for any of the drives on this interface.
389	 */
390	ide_port_for_each_dev(i, tdrive, hwif)
391		pre_reset(tdrive);
392
393	if (io_ports->ctl_addr == 0) {
394		spin_unlock_irqrestore(&hwif->lock, flags);
395		ide_complete_drive_reset(drive, -ENXIO);
396		return ide_stopped;
397	}
398
399	/*
400	 * Note that we also set nIEN while resetting the device,
401	 * to mask unwanted interrupts from the interface during the reset.
402	 * However, due to the design of PC hardware, this will cause an
403	 * immediate interrupt due to the edge transition it produces.
404	 * This single interrupt gives us a "fast poll" for drives that
405	 * recover from reset very quickly, saving us the first 50ms wait time.
406	 */
407	/* set SRST and nIEN */
408	tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS);
409	/* more than enough time */
410	udelay(10);
411	/* clear SRST, leave nIEN (unless device is on the quirk list) */
412	tp_ops->write_devctl(hwif,
413		((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) |
414		 ATA_DEVCTL_OBS);
415	/* more than enough time */
416	udelay(10);
417	hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
418	hwif->polling = 1;
419	__ide_set_handler(drive, &reset_pollfunc, HZ/20);
420
421	/*
422	 * Some weird controller like resetting themselves to a strange
423	 * state when the disks are reset this way. At least, the Winbond
424	 * 553 documentation says that
425	 */
426	port_ops = hwif->port_ops;
427	if (port_ops && port_ops->resetproc)
428		port_ops->resetproc(drive);
429
430	spin_unlock_irqrestore(&hwif->lock, flags);
431	return ide_started;
432}
433
434/*
435 * ide_do_reset() is the entry point to the drive/interface reset code.
436 */
437
438ide_startstop_t ide_do_reset(ide_drive_t *drive)
439{
440	return do_reset1(drive, 0);
441}
442EXPORT_SYMBOL(ide_do_reset);
443