2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 2003 Red Hat <alan@redhat.com>
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/hdreg.h>
22 #include <linux/ide.h>
23 #include <linux/bitops.h>
24 #include <linux/nmi.h>
26 #include <asm/byteorder.h>
28 #include <asm/uaccess.h>
32 * Conventional PIO operations for ATA devices
35 static u8 ide_inb (unsigned long port)
37 return (u8) inb(port);
40 static void ide_outb (u8 val, unsigned long port)
46 * MMIO operations, typically used for SATA controllers
49 static u8 ide_mm_inb (unsigned long port)
51 return (u8) readb((void __iomem *) port);
54 static void ide_mm_outb (u8 value, unsigned long port)
56 writeb(value, (void __iomem *) port);
59 void SELECT_DRIVE (ide_drive_t *drive)
61 ide_hwif_t *hwif = drive->hwif;
62 const struct ide_port_ops *port_ops = hwif->port_ops;
65 if (port_ops && port_ops->selectproc)
66 port_ops->selectproc(drive);
68 memset(&task, 0, sizeof(task));
69 task.tf_flags = IDE_TFLAG_OUT_DEVICE;
71 drive->hwif->tp_ops->tf_load(drive, &task);
74 void SELECT_MASK(ide_drive_t *drive, int mask)
76 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
78 if (port_ops && port_ops->maskproc)
79 port_ops->maskproc(drive, mask);
82 void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
84 if (hwif->host_flags & IDE_HFLAG_MMIO)
85 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
87 outb(cmd, hwif->io_ports.command_addr);
89 EXPORT_SYMBOL_GPL(ide_exec_command);
91 u8 ide_read_status(ide_hwif_t *hwif)
93 if (hwif->host_flags & IDE_HFLAG_MMIO)
94 return readb((void __iomem *)hwif->io_ports.status_addr);
96 return inb(hwif->io_ports.status_addr);
98 EXPORT_SYMBOL_GPL(ide_read_status);
100 u8 ide_read_altstatus(ide_hwif_t *hwif)
102 if (hwif->host_flags & IDE_HFLAG_MMIO)
103 return readb((void __iomem *)hwif->io_ports.ctl_addr);
105 return inb(hwif->io_ports.ctl_addr);
107 EXPORT_SYMBOL_GPL(ide_read_altstatus);
109 u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
111 if (hwif->host_flags & IDE_HFLAG_MMIO)
112 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
114 return inb(hwif->dma_base + ATA_DMA_STATUS);
116 EXPORT_SYMBOL_GPL(ide_read_sff_dma_status);
118 void ide_set_irq(ide_hwif_t *hwif, int on)
120 u8 ctl = ATA_DEVCTL_OBS;
122 if (on == 4) { /* hack for SRST */
129 if (hwif->host_flags & IDE_HFLAG_MMIO)
130 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
132 outb(ctl, hwif->io_ports.ctl_addr);
134 EXPORT_SYMBOL_GPL(ide_set_irq);
136 void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
138 ide_hwif_t *hwif = drive->hwif;
139 struct ide_io_ports *io_ports = &hwif->io_ports;
140 struct ide_taskfile *tf = &task->tf;
141 void (*tf_outb)(u8 addr, unsigned long port);
142 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
143 u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
146 tf_outb = ide_mm_outb;
150 if (task->tf_flags & IDE_TFLAG_FLAGGED)
153 if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
154 u16 data = (tf->hob_data << 8) | tf->data;
157 writew(data, (void __iomem *)io_ports->data_addr);
159 outw(data, io_ports->data_addr);
162 if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
163 tf_outb(tf->hob_feature, io_ports->feature_addr);
164 if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
165 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
166 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
167 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
168 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
169 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
170 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
171 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
173 if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
174 tf_outb(tf->feature, io_ports->feature_addr);
175 if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
176 tf_outb(tf->nsect, io_ports->nsect_addr);
177 if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
178 tf_outb(tf->lbal, io_ports->lbal_addr);
179 if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
180 tf_outb(tf->lbam, io_ports->lbam_addr);
181 if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
182 tf_outb(tf->lbah, io_ports->lbah_addr);
184 if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
185 tf_outb((tf->device & HIHI) | drive->select.all,
186 io_ports->device_addr);
188 EXPORT_SYMBOL_GPL(ide_tf_load);
190 void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
192 ide_hwif_t *hwif = drive->hwif;
193 struct ide_io_ports *io_ports = &hwif->io_ports;
194 struct ide_taskfile *tf = &task->tf;
195 void (*tf_outb)(u8 addr, unsigned long port);
196 u8 (*tf_inb)(unsigned long port);
197 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
200 tf_outb = ide_mm_outb;
207 if (task->tf_flags & IDE_TFLAG_IN_DATA) {
211 data = readw((void __iomem *)io_ports->data_addr);
213 data = inw(io_ports->data_addr);
215 tf->data = data & 0xff;
216 tf->hob_data = (data >> 8) & 0xff;
219 /* be sure we're looking at the low order bits */
220 tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
222 if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
223 tf->feature = tf_inb(io_ports->feature_addr);
224 if (task->tf_flags & IDE_TFLAG_IN_NSECT)
225 tf->nsect = tf_inb(io_ports->nsect_addr);
226 if (task->tf_flags & IDE_TFLAG_IN_LBAL)
227 tf->lbal = tf_inb(io_ports->lbal_addr);
228 if (task->tf_flags & IDE_TFLAG_IN_LBAM)
229 tf->lbam = tf_inb(io_ports->lbam_addr);
230 if (task->tf_flags & IDE_TFLAG_IN_LBAH)
231 tf->lbah = tf_inb(io_ports->lbah_addr);
232 if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
233 tf->device = tf_inb(io_ports->device_addr);
235 if (task->tf_flags & IDE_TFLAG_LBA48) {
236 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
238 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
239 tf->hob_feature = tf_inb(io_ports->feature_addr);
240 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
241 tf->hob_nsect = tf_inb(io_ports->nsect_addr);
242 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
243 tf->hob_lbal = tf_inb(io_ports->lbal_addr);
244 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
245 tf->hob_lbam = tf_inb(io_ports->lbam_addr);
246 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
247 tf->hob_lbah = tf_inb(io_ports->lbah_addr);
250 EXPORT_SYMBOL_GPL(ide_tf_read);
253 * Some localbus EIDE interfaces require a special access sequence
254 * when using 32-bit I/O instructions to transfer data. We call this
255 * the "vlb_sync" sequence, which consists of three successive reads
256 * of the sector count register location, with interrupts disabled
257 * to ensure that the reads all happen together.
259 static void ata_vlb_sync(unsigned long port)
267 * This is used for most PIO data transfers *from* the IDE interface
269 * These routines will round up any request for an odd number of bytes,
270 * so if an odd len is specified, be sure that there's at least one
271 * extra byte allocated for the buffer.
273 void ide_input_data(ide_drive_t *drive, struct request *rq, void *buf,
276 ide_hwif_t *hwif = drive->hwif;
277 struct ide_io_ports *io_ports = &hwif->io_ports;
278 unsigned long data_addr = io_ports->data_addr;
279 u8 io_32bit = drive->io_32bit;
280 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
285 unsigned long uninitialized_var(flags);
287 if ((io_32bit & 2) && !mmio) {
288 local_irq_save(flags);
289 ata_vlb_sync(io_ports->nsect_addr);
293 __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
295 insl(data_addr, buf, len / 4);
297 if ((io_32bit & 2) && !mmio)
298 local_irq_restore(flags);
300 if ((len & 3) >= 2) {
302 __ide_mm_insw((void __iomem *)data_addr,
303 (u8 *)buf + (len & ~3), 1);
305 insw(data_addr, (u8 *)buf + (len & ~3), 1);
309 __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
311 insw(data_addr, buf, len / 2);
314 EXPORT_SYMBOL_GPL(ide_input_data);
317 * This is used for most PIO data transfers *to* the IDE interface
319 void ide_output_data(ide_drive_t *drive, struct request *rq, void *buf,
322 ide_hwif_t *hwif = drive->hwif;
323 struct ide_io_ports *io_ports = &hwif->io_ports;
324 unsigned long data_addr = io_ports->data_addr;
325 u8 io_32bit = drive->io_32bit;
326 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
329 unsigned long uninitialized_var(flags);
331 if ((io_32bit & 2) && !mmio) {
332 local_irq_save(flags);
333 ata_vlb_sync(io_ports->nsect_addr);
337 __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
339 outsl(data_addr, buf, len / 4);
341 if ((io_32bit & 2) && !mmio)
342 local_irq_restore(flags);
344 if ((len & 3) >= 2) {
346 __ide_mm_outsw((void __iomem *)data_addr,
347 (u8 *)buf + (len & ~3), 1);
349 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
353 __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
355 outsw(data_addr, buf, len / 2);
358 EXPORT_SYMBOL_GPL(ide_output_data);
360 u8 ide_read_error(ide_drive_t *drive)
364 memset(&task, 0, sizeof(task));
365 task.tf_flags = IDE_TFLAG_IN_FEATURE;
367 drive->hwif->tp_ops->tf_read(drive, &task);
369 return task.tf.error;
371 EXPORT_SYMBOL_GPL(ide_read_error);
373 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
377 memset(&task, 0, sizeof(task));
378 task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
381 drive->hwif->tp_ops->tf_read(drive, &task);
383 *bcount = (task.tf.lbah << 8) | task.tf.lbam;
384 *ireason = task.tf.nsect & 3;
386 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
388 const struct ide_tp_ops default_tp_ops = {
389 .exec_command = ide_exec_command,
390 .read_status = ide_read_status,
391 .read_altstatus = ide_read_altstatus,
392 .read_sff_dma_status = ide_read_sff_dma_status,
394 .set_irq = ide_set_irq,
396 .tf_load = ide_tf_load,
397 .tf_read = ide_tf_read,
399 .input_data = ide_input_data,
400 .output_data = ide_output_data,
403 void ide_fix_driveid(u16 *id)
405 #ifndef __LITTLE_ENDIAN
409 for (i = 0; i < 256; i++)
410 id[i] = __le16_to_cpu(id[i]);
412 # error "Please fix <asm/byteorder.h>"
418 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
419 * removing leading/trailing blanks and compressing internal blanks.
420 * It is primarily used to tidy up the model name/number fields as
421 * returned by the ATA_CMD_ID_ATA[PI] commands.
424 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
426 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
429 /* convert from big-endian to host byte order */
430 for (p = s ; p != end ; p += 2)
431 be16_to_cpus((u16 *) p);
434 /* strip leading blanks */
436 while (s != end && *s == ' ')
438 /* compress internal blanks and strip trailing blanks */
439 while (s != end && *s) {
440 if (*s++ != ' ' || (s != end && *s && *s != ' '))
443 /* wipe out trailing garbage */
448 EXPORT_SYMBOL(ide_fixstring);
451 * Needed for PCI irq sharing
453 int drive_is_ready (ide_drive_t *drive)
455 ide_hwif_t *hwif = HWIF(drive);
458 if (drive->waiting_for_dma)
459 return hwif->dma_ops->dma_test_irq(drive);
462 /* need to guarantee 400ns since last command was issued */
467 * We do a passive status test under shared PCI interrupts on
468 * cards that truly share the ATA side interrupt, but may also share
469 * an interrupt with another pci card/device. We make no assumptions
470 * about possible isa-pnp and pci-pnp issues yet.
472 if (hwif->io_ports.ctl_addr)
473 stat = hwif->tp_ops->read_altstatus(hwif);
475 /* Note: this may clear a pending IRQ!! */
476 stat = hwif->tp_ops->read_status(hwif);
479 /* drive busy: definitely not interrupting */
482 /* drive ready: *might* be interrupting */
486 EXPORT_SYMBOL(drive_is_ready);
489 * This routine busy-waits for the drive status to be not "busy".
490 * It then checks the status for all of the "good" bits and none
491 * of the "bad" bits, and if all is okay it returns 0. All other
492 * cases return error -- caller may then invoke ide_error().
494 * This routine should get fixed to not hog the cpu during extra long waits..
495 * That could be done by busy-waiting for the first jiffy or two, and then
496 * setting a timer to wake up at half second intervals thereafter,
497 * until timeout is achieved, before timing out.
499 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
501 ide_hwif_t *hwif = drive->hwif;
502 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
507 udelay(1); /* spec allows drive 400ns to assert "BUSY" */
508 stat = tp_ops->read_status(hwif);
510 if (stat & ATA_BUSY) {
511 local_irq_set(flags);
513 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
514 if (time_after(jiffies, timeout)) {
516 * One last read after the timeout in case
517 * heavy interrupt load made us not make any
518 * progress during the timeout..
520 stat = tp_ops->read_status(hwif);
521 if ((stat & ATA_BUSY) == 0)
524 local_irq_restore(flags);
529 local_irq_restore(flags);
532 * Allow status to settle, then read it again.
533 * A few rare drives vastly violate the 400ns spec here,
534 * so we'll wait up to 10usec for a "good" status
535 * rather than expensively fail things immediately.
536 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
538 for (i = 0; i < 10; i++) {
540 stat = tp_ops->read_status(hwif);
542 if (OK_STAT(stat, good, bad)) {
552 * In case of error returns error value after doing "*startstop = ide_error()".
553 * The caller should return the updated value of "startstop" in this case,
554 * "startstop" is unchanged when the function returns 0.
556 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
561 /* bail early if we've exceeded max_failures */
562 if (drive->max_failures && (drive->failures > drive->max_failures)) {
563 *startstop = ide_stopped;
567 err = __ide_wait_stat(drive, good, bad, timeout, &stat);
570 char *s = (err == -EBUSY) ? "status timeout" : "status error";
571 *startstop = ide_error(drive, s, stat);
577 EXPORT_SYMBOL(ide_wait_stat);
580 * ide_in_drive_list - look for drive in black/white list
581 * @id: drive identifier
582 * @table: list to inspect
584 * Look for a drive in the blacklist and the whitelist tables
585 * Returns 1 if the drive is found in the table.
588 int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
590 for ( ; table->id_model; table++)
591 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
592 (!table->id_firmware ||
593 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
598 EXPORT_SYMBOL_GPL(ide_in_drive_list);
601 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
602 * We list them here and depend on the device side cable detection for them.
604 * Some optical devices with the buggy firmwares have the same problem.
606 static const struct drive_list_entry ivb_list[] = {
607 { "QUANTUM FIREBALLlct10 05" , "A03.0900" },
608 { "TSSTcorp CDDVDW SH-S202J" , "SB00" },
609 { "TSSTcorp CDDVDW SH-S202J" , "SB01" },
610 { "TSSTcorp CDDVDW SH-S202N" , "SB00" },
611 { "TSSTcorp CDDVDW SH-S202N" , "SB01" },
612 { "TSSTcorp CDDVDW SH-S202H" , "SB00" },
613 { "TSSTcorp CDDVDW SH-S202H" , "SB01" },
618 * All hosts that use the 80c ribbon must use!
619 * The name is derived from upper byte of word 93 and the 80c ribbon.
621 u8 eighty_ninty_three (ide_drive_t *drive)
623 ide_hwif_t *hwif = drive->hwif;
625 int ivb = ide_in_drive_list(id, ivb_list);
627 if (hwif->cbl == ATA_CBL_PATA40_SHORT)
631 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
634 if (ide_dev_is_sata(id) && !ivb)
637 if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
642 * - change master/slave IDENTIFY order
643 * - force bit13 (80c cable present) check also for !ivb devices
644 * (unless the slave device is pre-ATA3)
646 if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
647 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
651 if (drive->udma33_warned == 1)
654 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
655 "limiting max speed to UDMA33\n",
657 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
659 drive->udma33_warned = 1;
664 int ide_driveid_update(ide_drive_t *drive)
666 ide_hwif_t *hwif = drive->hwif;
667 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
673 * Re-read drive->id for possible DMA mode
674 * change (copied from ide-probe.c)
677 SELECT_MASK(drive, 1);
678 tp_ops->set_irq(hwif, 0);
680 tp_ops->exec_command(hwif, ATA_CMD_ID_ATA);
682 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) {
683 SELECT_MASK(drive, 0);
687 msleep(50); /* wait for IRQ and ATA_DRQ */
688 stat = tp_ops->read_status(hwif);
690 if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) {
691 SELECT_MASK(drive, 0);
692 printk("%s: CHECK for good STATUS\n", drive->name);
695 local_irq_save(flags);
696 SELECT_MASK(drive, 0);
697 id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
699 local_irq_restore(flags);
702 tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
703 (void)tp_ops->read_status(hwif); /* clear drive IRQ */
705 local_irq_restore(flags);
708 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
709 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
710 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
711 /* anything more ? */
715 if (drive->using_dma && ide_id_dma_bug(drive))
721 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
723 ide_hwif_t *hwif = drive->hwif;
724 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
725 u16 *id = drive->id, i;
730 #ifdef CONFIG_BLK_DEV_IDEDMA
731 if (hwif->dma_ops) /* check if host supports DMA */
732 hwif->dma_ops->dma_host_set(drive, 0);
735 /* Skip setting PIO flow-control modes on pre-EIDE drives */
736 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
740 * Don't use ide_wait_cmd here - it will
741 * attempt to set_geometry and recalibrate,
742 * but for some reason these don't work at
743 * this point (lost interrupt).
746 * Select the drive, and issue the SETFEATURES command
748 disable_irq_nosync(hwif->irq);
751 * FIXME: we race against the running IRQ here if
752 * this is called from non IRQ context. If we use
753 * disable_irq() we hang on the error path. Work
759 SELECT_MASK(drive, 0);
761 tp_ops->set_irq(hwif, 0);
763 memset(&task, 0, sizeof(task));
764 task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
765 task.tf.feature = SETFEATURES_XFER;
766 task.tf.nsect = speed;
768 tp_ops->tf_load(drive, &task);
770 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
772 if (drive->quirk_list == 2)
773 tp_ops->set_irq(hwif, 1);
775 error = __ide_wait_stat(drive, drive->ready_stat,
776 ATA_BUSY | ATA_DRQ | ATA_ERR,
779 SELECT_MASK(drive, 0);
781 enable_irq(hwif->irq);
784 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
788 id[ATA_ID_UDMA_MODES] &= ~0xFF00;
789 id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
790 id[ATA_ID_SWDMA_MODES] &= ~0x0F00;
793 #ifdef CONFIG_BLK_DEV_IDEDMA
794 if (speed >= XFER_SW_DMA_0 && drive->using_dma)
795 hwif->dma_ops->dma_host_set(drive, 1);
796 else if (hwif->dma_ops) /* check if host supports DMA */
797 ide_dma_off_quietly(drive);
800 if (speed >= XFER_UDMA_0) {
801 i = 1 << (speed - XFER_UDMA_0);
802 id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
803 } else if (speed >= XFER_MW_DMA_0) {
804 i = 1 << (speed - XFER_MW_DMA_0);
805 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
806 } else if (speed >= XFER_SW_DMA_0) {
807 i = 1 << (speed - XFER_SW_DMA_0);
808 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
811 if (!drive->init_speed)
812 drive->init_speed = speed;
813 drive->current_speed = speed;
818 * This should get invoked any time we exit the driver to
819 * wait for an interrupt response from a drive. handler() points
820 * at the appropriate code to handle the next interrupt, and a
821 * timer is started to prevent us from waiting forever in case
822 * something goes wrong (see the ide_timer_expiry() handler later on).
824 * See also ide_execute_command
826 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
827 unsigned int timeout, ide_expiry_t *expiry)
829 ide_hwgroup_t *hwgroup = HWGROUP(drive);
831 BUG_ON(hwgroup->handler);
832 hwgroup->handler = handler;
833 hwgroup->expiry = expiry;
834 hwgroup->timer.expires = jiffies + timeout;
835 hwgroup->req_gen_timer = hwgroup->req_gen;
836 add_timer(&hwgroup->timer);
839 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
840 unsigned int timeout, ide_expiry_t *expiry)
843 spin_lock_irqsave(&ide_lock, flags);
844 __ide_set_handler(drive, handler, timeout, expiry);
845 spin_unlock_irqrestore(&ide_lock, flags);
848 EXPORT_SYMBOL(ide_set_handler);
851 * ide_execute_command - execute an IDE command
852 * @drive: IDE drive to issue the command against
853 * @command: command byte to write
854 * @handler: handler for next phase
855 * @timeout: timeout for command
856 * @expiry: handler to run on timeout
858 * Helper function to issue an IDE command. This handles the
859 * atomicity requirements, command timing and ensures that the
860 * handler and IRQ setup do not race. All IDE command kick off
861 * should go via this function or do equivalent locking.
864 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
865 unsigned timeout, ide_expiry_t *expiry)
868 ide_hwif_t *hwif = HWIF(drive);
870 spin_lock_irqsave(&ide_lock, flags);
871 __ide_set_handler(drive, handler, timeout, expiry);
872 hwif->tp_ops->exec_command(hwif, cmd);
874 * Drive takes 400nS to respond, we must avoid the IRQ being
875 * serviced before that.
877 * FIXME: we could skip this delay with care on non shared devices
880 spin_unlock_irqrestore(&ide_lock, flags);
882 EXPORT_SYMBOL(ide_execute_command);
884 void ide_execute_pkt_cmd(ide_drive_t *drive)
886 ide_hwif_t *hwif = drive->hwif;
889 spin_lock_irqsave(&ide_lock, flags);
890 hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET);
892 spin_unlock_irqrestore(&ide_lock, flags);
894 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
896 static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
898 struct request *rq = drive->hwif->hwgroup->rq;
900 if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
901 ide_end_request(drive, err ? err : 1, 0);
905 static ide_startstop_t do_reset1 (ide_drive_t *, int);
908 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
909 * during an atapi drive reset operation. If the drive has not yet responded,
910 * and we have not yet hit our maximum waiting time, then the timer is restarted
913 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
915 ide_hwif_t *hwif = drive->hwif;
916 ide_hwgroup_t *hwgroup = hwif->hwgroup;
921 stat = hwif->tp_ops->read_status(hwif);
923 if (OK_STAT(stat, 0, ATA_BUSY))
924 printk("%s: ATAPI reset complete\n", drive->name);
926 if (time_before(jiffies, hwgroup->poll_timeout)) {
927 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
928 /* continue polling */
932 hwgroup->polling = 0;
933 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
935 /* do it the old fashioned way */
936 return do_reset1(drive, 1);
939 hwgroup->polling = 0;
940 ide_complete_drive_reset(drive, 0);
945 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
946 * during an ide reset operation. If the drives have not yet responded,
947 * and we have not yet hit our maximum waiting time, then the timer is restarted
950 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
952 ide_hwgroup_t *hwgroup = HWGROUP(drive);
953 ide_hwif_t *hwif = HWIF(drive);
954 const struct ide_port_ops *port_ops = hwif->port_ops;
958 if (port_ops && port_ops->reset_poll) {
959 err = port_ops->reset_poll(drive);
961 printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
962 hwif->name, drive->name);
967 tmp = hwif->tp_ops->read_status(hwif);
969 if (!OK_STAT(tmp, 0, ATA_BUSY)) {
970 if (time_before(jiffies, hwgroup->poll_timeout)) {
971 ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
972 /* continue polling */
975 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
979 printk("%s: reset: ", hwif->name);
980 tmp = ide_read_error(drive);
988 switch (tmp & 0x7f) {
989 case 1: printk("passed");
991 case 2: printk("formatter device error");
993 case 3: printk("sector buffer error");
995 case 4: printk("ECC circuitry error");
997 case 5: printk("controlling MPU error");
999 default:printk("error (0x%02x?)", tmp);
1002 printk("; slave: failed");
1008 hwgroup->polling = 0; /* done polling */
1009 ide_complete_drive_reset(drive, err);
1013 static void ide_disk_pre_reset(ide_drive_t *drive)
1015 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
1017 drive->special.all = 0;
1018 drive->special.b.set_geometry = legacy;
1019 drive->special.b.recalibrate = legacy;
1020 drive->mult_count = 0;
1021 if (!drive->keep_settings && !drive->using_dma)
1022 drive->mult_req = 0;
1023 if (drive->mult_req != drive->mult_count)
1024 drive->special.b.set_multmode = 1;
1027 static void pre_reset(ide_drive_t *drive)
1029 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1031 if (drive->media == ide_disk)
1032 ide_disk_pre_reset(drive);
1034 drive->post_reset = 1;
1036 if (drive->using_dma) {
1037 if (drive->crc_count)
1038 ide_check_dma_crc(drive);
1043 if (!drive->keep_settings) {
1044 if (!drive->using_dma) {
1046 drive->io_32bit = 0;
1051 if (port_ops && port_ops->pre_reset)
1052 port_ops->pre_reset(drive);
1054 if (drive->current_speed != 0xff)
1055 drive->desired_speed = drive->current_speed;
1056 drive->current_speed = 0xff;
1060 * do_reset1() attempts to recover a confused drive by resetting it.
1061 * Unfortunately, resetting a disk drive actually resets all devices on
1062 * the same interface, so it can really be thought of as resetting the
1063 * interface rather than resetting the drive.
1065 * ATAPI devices have their own reset mechanism which allows them to be
1066 * individually reset without clobbering other devices on the same interface.
1068 * Unfortunately, the IDE interface does not generate an interrupt to let
1069 * us know when the reset operation has finished, so we must poll for this.
1070 * Equally poor, though, is the fact that this may a very long time to complete,
1071 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
1072 * we set a timer to poll at 50ms intervals.
1074 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1077 unsigned long flags;
1079 ide_hwgroup_t *hwgroup;
1080 struct ide_io_ports *io_ports;
1081 const struct ide_tp_ops *tp_ops;
1082 const struct ide_port_ops *port_ops;
1084 spin_lock_irqsave(&ide_lock, flags);
1086 hwgroup = HWGROUP(drive);
1088 io_ports = &hwif->io_ports;
1090 tp_ops = hwif->tp_ops;
1092 /* We must not reset with running handlers */
1093 BUG_ON(hwgroup->handler != NULL);
1095 /* For an ATAPI device, first try an ATAPI SRST. */
1096 if (drive->media != ide_disk && !do_not_try_atapi) {
1098 SELECT_DRIVE(drive);
1100 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
1102 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1103 hwgroup->polling = 1;
1104 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1105 spin_unlock_irqrestore(&ide_lock, flags);
1110 * First, reset any device state data we were maintaining
1111 * for any of the drives on this interface.
1113 for (unit = 0; unit < MAX_DRIVES; ++unit)
1114 pre_reset(&hwif->drives[unit]);
1116 if (io_ports->ctl_addr == 0) {
1117 spin_unlock_irqrestore(&ide_lock, flags);
1118 ide_complete_drive_reset(drive, -ENXIO);
1123 * Note that we also set nIEN while resetting the device,
1124 * to mask unwanted interrupts from the interface during the reset.
1125 * However, due to the design of PC hardware, this will cause an
1126 * immediate interrupt due to the edge transition it produces.
1127 * This single interrupt gives us a "fast poll" for drives that
1128 * recover from reset very quickly, saving us the first 50ms wait time.
1130 * TODO: add ->softreset method and stop abusing ->set_irq
1132 /* set SRST and nIEN */
1133 tp_ops->set_irq(hwif, 4);
1134 /* more than enough time */
1136 /* clear SRST, leave nIEN (unless device is on the quirk list) */
1137 tp_ops->set_irq(hwif, drive->quirk_list == 2);
1138 /* more than enough time */
1140 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1141 hwgroup->polling = 1;
1142 __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1145 * Some weird controller like resetting themselves to a strange
1146 * state when the disks are reset this way. At least, the Winbond
1147 * 553 documentation says that
1149 port_ops = hwif->port_ops;
1150 if (port_ops && port_ops->resetproc)
1151 port_ops->resetproc(drive);
1153 spin_unlock_irqrestore(&ide_lock, flags);
1158 * ide_do_reset() is the entry point to the drive/interface reset code.
1161 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1163 return do_reset1(drive, 0);
1166 EXPORT_SYMBOL(ide_do_reset);
1169 * ide_wait_not_busy() waits for the currently selected device on the hwif
1170 * to report a non-busy status, see comments in ide_probe_port().
1172 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1178 * Turn this into a schedule() sleep once I'm sure
1179 * about locking issues (2.5 work ?).
1182 stat = hwif->tp_ops->read_status(hwif);
1183 if ((stat & ATA_BUSY) == 0)
1186 * Assume a value of 0xff means nothing is connected to
1187 * the interface and it doesn't implement the pull-down
1192 touch_softlockup_watchdog();
1193 touch_nmi_watchdog();
1198 EXPORT_SYMBOL_GPL(ide_wait_not_busy);