2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 2003 Red Hat
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/string.h>
10 #include <linux/kernel.h>
11 #include <linux/timer.h>
13 #include <linux/interrupt.h>
14 #include <linux/major.h>
15 #include <linux/errno.h>
16 #include <linux/genhd.h>
17 #include <linux/blkpg.h>
18 #include <linux/slab.h>
19 #include <linux/pci.h>
20 #include <linux/delay.h>
21 #include <linux/ide.h>
22 #include <linux/bitops.h>
23 #include <linux/nmi.h>
25 #include <asm/byteorder.h>
27 #include <asm/uaccess.h>
30 void SELECT_MASK(ide_drive_t *drive, int mask)
32 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
34 if (port_ops && port_ops->maskproc)
35 port_ops->maskproc(drive, mask);
38 u8 ide_read_error(ide_drive_t *drive)
40 struct ide_taskfile tf;
42 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR);
46 EXPORT_SYMBOL_GPL(ide_read_error);
48 void ide_fix_driveid(u16 *id)
50 #ifndef __LITTLE_ENDIAN
54 for (i = 0; i < 256; i++)
55 id[i] = __le16_to_cpu(id[i]);
57 # error "Please fix <asm/byteorder.h>"
63 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
64 * removing leading/trailing blanks and compressing internal blanks.
65 * It is primarily used to tidy up the model name/number fields as
66 * returned by the ATA_CMD_ID_ATA[PI] commands.
69 void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
71 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
74 /* convert from big-endian to host byte order */
75 for (p = s ; p != end ; p += 2)
76 be16_to_cpus((u16 *) p);
79 /* strip leading blanks */
81 while (s != end && *s == ' ')
83 /* compress internal blanks and strip trailing blanks */
84 while (s != end && *s) {
85 if (*s++ != ' ' || (s != end && *s && *s != ' '))
88 /* wipe out trailing garbage */
92 EXPORT_SYMBOL(ide_fixstring);
95 * This routine busy-waits for the drive status to be not "busy".
96 * It then checks the status for all of the "good" bits and none
97 * of the "bad" bits, and if all is okay it returns 0. All other
98 * cases return error -- caller may then invoke ide_error().
100 * This routine should get fixed to not hog the cpu during extra long waits..
101 * That could be done by busy-waiting for the first jiffy or two, and then
102 * setting a timer to wake up at half second intervals thereafter,
103 * until timeout is achieved, before timing out.
105 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
106 unsigned long timeout, u8 *rstat)
108 ide_hwif_t *hwif = drive->hwif;
109 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
114 udelay(1); /* spec allows drive 400ns to assert "BUSY" */
115 stat = tp_ops->read_status(hwif);
117 if (stat & ATA_BUSY) {
118 local_save_flags(flags);
119 local_irq_enable_in_hardirq();
121 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
122 if (time_after(jiffies, timeout)) {
124 * One last read after the timeout in case
125 * heavy interrupt load made us not make any
126 * progress during the timeout..
128 stat = tp_ops->read_status(hwif);
129 if ((stat & ATA_BUSY) == 0)
132 local_irq_restore(flags);
137 local_irq_restore(flags);
140 * Allow status to settle, then read it again.
141 * A few rare drives vastly violate the 400ns spec here,
142 * so we'll wait up to 10usec for a "good" status
143 * rather than expensively fail things immediately.
144 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
146 for (i = 0; i < 10; i++) {
148 stat = tp_ops->read_status(hwif);
150 if (OK_STAT(stat, good, bad)) {
160 * In case of error returns error value after doing "*startstop = ide_error()".
161 * The caller should return the updated value of "startstop" in this case,
162 * "startstop" is unchanged when the function returns 0.
164 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good,
165 u8 bad, unsigned long timeout)
170 /* bail early if we've exceeded max_failures */
171 if (drive->max_failures && (drive->failures > drive->max_failures)) {
172 *startstop = ide_stopped;
176 err = __ide_wait_stat(drive, good, bad, timeout, &stat);
179 char *s = (err == -EBUSY) ? "status timeout" : "status error";
180 *startstop = ide_error(drive, s, stat);
185 EXPORT_SYMBOL(ide_wait_stat);
188 * ide_in_drive_list - look for drive in black/white list
189 * @id: drive identifier
190 * @table: list to inspect
192 * Look for a drive in the blacklist and the whitelist tables
193 * Returns 1 if the drive is found in the table.
196 int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
198 for ( ; table->id_model; table++)
199 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
200 (!table->id_firmware ||
201 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
205 EXPORT_SYMBOL_GPL(ide_in_drive_list);
208 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
209 * We list them here and depend on the device side cable detection for them.
211 * Some optical devices with the buggy firmwares have the same problem.
213 static const struct drive_list_entry ivb_list[] = {
214 { "QUANTUM FIREBALLlct10 05" , "A03.0900" },
215 { "TSSTcorp CDDVDW SH-S202J" , "SB00" },
216 { "TSSTcorp CDDVDW SH-S202J" , "SB01" },
217 { "TSSTcorp CDDVDW SH-S202N" , "SB00" },
218 { "TSSTcorp CDDVDW SH-S202N" , "SB01" },
219 { "TSSTcorp CDDVDW SH-S202H" , "SB00" },
220 { "TSSTcorp CDDVDW SH-S202H" , "SB01" },
221 { "SAMSUNG SP0822N" , "WA100-10" },
226 * All hosts that use the 80c ribbon must use!
227 * The name is derived from upper byte of word 93 and the 80c ribbon.
229 u8 eighty_ninty_three(ide_drive_t *drive)
231 ide_hwif_t *hwif = drive->hwif;
233 int ivb = ide_in_drive_list(id, ivb_list);
235 if (hwif->cbl == ATA_CBL_PATA40_SHORT)
239 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
242 if (ata_id_is_sata(id) && !ivb)
245 if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
250 * - change master/slave IDENTIFY order
251 * - force bit13 (80c cable present) check also for !ivb devices
252 * (unless the slave device is pre-ATA3)
254 if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
255 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
259 if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
262 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
263 "limiting max speed to UDMA33\n",
265 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
267 drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;
272 int ide_driveid_update(ide_drive_t *drive)
277 id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
281 SELECT_MASK(drive, 1);
282 rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
283 SELECT_MASK(drive, 0);
288 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
289 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
290 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
291 drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES];
292 /* anything more ? */
296 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
301 SELECT_MASK(drive, 0);
303 printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
308 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
310 ide_hwif_t *hwif = drive->hwif;
311 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
312 struct ide_taskfile tf;
313 u16 *id = drive->id, i;
317 #ifdef CONFIG_BLK_DEV_IDEDMA
318 if (hwif->dma_ops) /* check if host supports DMA */
319 hwif->dma_ops->dma_host_set(drive, 0);
322 /* Skip setting PIO flow-control modes on pre-EIDE drives */
323 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
327 * Don't use ide_wait_cmd here - it will
328 * attempt to set_geometry and recalibrate,
329 * but for some reason these don't work at
330 * this point (lost interrupt).
334 * FIXME: we race against the running IRQ here if
335 * this is called from non IRQ context. If we use
336 * disable_irq() we hang on the error path. Work
339 disable_irq_nosync(hwif->irq);
342 tp_ops->dev_select(drive);
343 SELECT_MASK(drive, 1);
345 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
347 memset(&tf, 0, sizeof(tf));
348 tf.feature = SETFEATURES_XFER;
351 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
353 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
355 if (drive->quirk_list == 2)
356 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
358 error = __ide_wait_stat(drive, drive->ready_stat,
359 ATA_BUSY | ATA_DRQ | ATA_ERR,
362 SELECT_MASK(drive, 0);
364 enable_irq(hwif->irq);
367 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
371 if (speed >= XFER_SW_DMA_0) {
372 id[ATA_ID_UDMA_MODES] &= ~0xFF00;
373 id[ATA_ID_MWDMA_MODES] &= ~0x0700;
374 id[ATA_ID_SWDMA_MODES] &= ~0x0700;
375 if (ata_id_is_cfa(id))
376 id[ATA_ID_CFA_MODES] &= ~0x0E00;
377 } else if (ata_id_is_cfa(id))
378 id[ATA_ID_CFA_MODES] &= ~0x01C0;
381 #ifdef CONFIG_BLK_DEV_IDEDMA
382 if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
383 hwif->dma_ops->dma_host_set(drive, 1);
384 else if (hwif->dma_ops) /* check if host supports DMA */
385 ide_dma_off_quietly(drive);
388 if (speed >= XFER_UDMA_0) {
389 i = 1 << (speed - XFER_UDMA_0);
390 id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
391 } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
392 i = speed - XFER_MW_DMA_2;
393 id[ATA_ID_CFA_MODES] |= i << 9;
394 } else if (speed >= XFER_MW_DMA_0) {
395 i = 1 << (speed - XFER_MW_DMA_0);
396 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
397 } else if (speed >= XFER_SW_DMA_0) {
398 i = 1 << (speed - XFER_SW_DMA_0);
399 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
400 } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
401 i = speed - XFER_PIO_4;
402 id[ATA_ID_CFA_MODES] |= i << 6;
405 if (!drive->init_speed)
406 drive->init_speed = speed;
407 drive->current_speed = speed;
412 * This should get invoked any time we exit the driver to
413 * wait for an interrupt response from a drive. handler() points
414 * at the appropriate code to handle the next interrupt, and a
415 * timer is started to prevent us from waiting forever in case
416 * something goes wrong (see the ide_timer_expiry() handler later on).
418 * See also ide_execute_command
420 void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
421 unsigned int timeout)
423 ide_hwif_t *hwif = drive->hwif;
425 BUG_ON(hwif->handler);
426 hwif->handler = handler;
427 hwif->timer.expires = jiffies + timeout;
428 hwif->req_gen_timer = hwif->req_gen;
429 add_timer(&hwif->timer);
432 void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
433 unsigned int timeout)
435 ide_hwif_t *hwif = drive->hwif;
438 spin_lock_irqsave(&hwif->lock, flags);
439 __ide_set_handler(drive, handler, timeout);
440 spin_unlock_irqrestore(&hwif->lock, flags);
442 EXPORT_SYMBOL(ide_set_handler);
445 * ide_execute_command - execute an IDE command
446 * @drive: IDE drive to issue the command against
448 * @handler: handler for next phase
449 * @timeout: timeout for command
451 * Helper function to issue an IDE command. This handles the
452 * atomicity requirements, command timing and ensures that the
453 * handler and IRQ setup do not race. All IDE command kick off
454 * should go via this function or do equivalent locking.
457 void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd,
458 ide_handler_t *handler, unsigned timeout)
460 ide_hwif_t *hwif = drive->hwif;
463 spin_lock_irqsave(&hwif->lock, flags);
464 if ((cmd->protocol != ATAPI_PROT_DMA &&
465 cmd->protocol != ATAPI_PROT_PIO) ||
466 (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
467 __ide_set_handler(drive, handler, timeout);
468 hwif->tp_ops->exec_command(hwif, cmd->tf.command);
470 * Drive takes 400nS to respond, we must avoid the IRQ being
471 * serviced before that.
473 * FIXME: we could skip this delay with care on non shared devices
476 spin_unlock_irqrestore(&hwif->lock, flags);
480 * ide_wait_not_busy() waits for the currently selected device on the hwif
481 * to report a non-busy status, see comments in ide_probe_port().
483 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
489 * Turn this into a schedule() sleep once I'm sure
490 * about locking issues (2.5 work ?).
493 stat = hwif->tp_ops->read_status(hwif);
494 if ((stat & ATA_BUSY) == 0)
497 * Assume a value of 0xff means nothing is connected to
498 * the interface and it doesn't implement the pull-down
503 touch_softlockup_watchdog();
504 touch_nmi_watchdog();