2 * linux/drivers/ide/ide-dma.c Version 4.10 June 9, 2000
4 * Copyright (c) 1999-2000 Andre Hedrick <andre@linux-ide.org>
5 * May be copied or modified under the terms of the GNU General Public License
9 * Special Thanks to Mark for his Six years of work.
11 * Copyright (c) 1995-1998 Mark Lord
12 * May be copied or modified under the terms of the GNU General Public License
16 * This module provides support for the bus-master IDE DMA functions
17 * of various PCI chipsets, including the Intel PIIX (i82371FB for
18 * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and
19 * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
20 * ("PIIX" stands for "PCI ISA IDE Xcellerator").
22 * Pretty much the same code works for other IDE PCI bus-mastering chipsets.
24 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
26 * By default, DMA support is prepared for use, but is currently enabled only
27 * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
28 * or which are recognized as "good" (see table below). Drives with only mode0
29 * or mode1 (multi/single) DMA should also work with this chipset/driver
30 * (eg. MC2112A) but are not enabled by default.
32 * Use "hdparm -i" to view modes supported by a given drive.
34 * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
35 * DMA support, but must be (re-)compiled against this kernel version or later.
37 * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
38 * If problems arise, ide.c will disable DMA operation after a few retries.
39 * This error recovery mechanism works and has been extremely well exercised.
41 * IDE drives, depending on their vintage, may support several different modes
42 * of DMA operation. The boot-time modes are indicated with a "*" in
43 * the "hdparm -i" listing, and can be changed with *knowledgeable* use of
44 * the "hdparm -X" feature. There is seldom a need to do this, as drives
45 * normally power-up with their "best" PIO/DMA modes enabled.
47 * Testing has been done with a rather extensive number of drives,
48 * with Quantum & Western Digital models generally outperforming the pack,
49 * and Fujitsu & Conner (and some Seagate which are really Conner) drives
50 * showing more lackluster throughput.
52 * Keep an eye on /var/adm/messages for "DMA disabled" messages.
54 * Some people have reported trouble with Intel Zappa motherboards.
55 * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
56 * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
57 * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
59 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
60 * fixing the problem with the BIOS on some Acer motherboards.
62 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
63 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
65 * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack
66 * at generic DMA -- his patches were referred to when preparing this code.
68 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
69 * for supplying a Promise UDMA board & WD UDMA drive for this work!
71 * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
73 * ATA-66/100 and recovery functions, I forgot the rest......
77 #include <linux/module.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/timer.h>
82 #include <linux/interrupt.h>
83 #include <linux/pci.h>
84 #include <linux/init.h>
85 #include <linux/ide.h>
86 #include <linux/delay.h>
87 #include <linux/scatterlist.h>
92 static const struct drive_list_entry drive_whitelist [] = {
94 { "Micropolis 2112A" , NULL },
95 { "CONNER CTMA 4000" , NULL },
96 { "CONNER CTT8000-A" , NULL },
97 { "ST34342A" , NULL },
101 static const struct drive_list_entry drive_blacklist [] = {
103 { "WDC AC11000H" , NULL },
104 { "WDC AC22100H" , NULL },
105 { "WDC AC32500H" , NULL },
106 { "WDC AC33100H" , NULL },
107 { "WDC AC31600H" , NULL },
108 { "WDC AC32100H" , "24.09P07" },
109 { "WDC AC23200L" , "21.10N21" },
110 { "Compaq CRD-8241B" , NULL },
111 { "CRD-8400B" , NULL },
112 { "CRD-8480B", NULL },
113 { "CRD-8482B", NULL },
115 { "SanDisk SDP3B" , NULL },
116 { "SanDisk SDP3B-64" , NULL },
117 { "SANYO CD-ROM CRD" , NULL },
118 { "HITACHI CDR-8" , NULL },
119 { "HITACHI CDR-8335" , NULL },
120 { "HITACHI CDR-8435" , NULL },
121 { "Toshiba CD-ROM XM-6202B" , NULL },
122 { "TOSHIBA CD-ROM XM-1702BC", NULL },
123 { "CD-532E-A" , NULL },
124 { "E-IDE CD-ROM CR-840", NULL },
125 { "CD-ROM Drive/F5A", NULL },
126 { "WPI CDD-820", NULL },
127 { "SAMSUNG CD-ROM SC-148C", NULL },
128 { "SAMSUNG CD-ROM SC", NULL },
129 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL },
130 { "_NEC DV5800A", NULL },
131 { "SAMSUNG CD-ROM SN-124", "N001" },
132 { "Seagate STT20000A", NULL },
138 * ide_in_drive_list - look for drive in black/white list
139 * @id: drive identifier
140 * @drive_table: list to inspect
142 * Look for a drive in the blacklist and the whitelist tables
143 * Returns 1 if the drive is found in the table.
146 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
148 for ( ; drive_table->id_model ; drive_table++)
149 if ((!strcmp(drive_table->id_model, id->model)) &&
150 (!drive_table->id_firmware ||
151 !strcmp(drive_table->id_firmware, "ALL") || /* to be removed later */
152 strstr(id->fw_rev, drive_table->id_firmware)))
158 * ide_dma_intr - IDE DMA interrupt handler
159 * @drive: the drive the interrupt is for
161 * Handle an interrupt completing a read/write DMA transfer on an
165 ide_startstop_t ide_dma_intr (ide_drive_t *drive)
167 u8 stat = 0, dma_stat = 0;
169 dma_stat = HWIF(drive)->ide_dma_end(drive);
170 stat = HWIF(drive)->INB(IDE_STATUS_REG); /* get drive status */
171 if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
173 struct request *rq = HWGROUP(drive)->rq;
178 drv = *(ide_driver_t **)rq->rq_disk->private_data;
179 drv->end_request(drive, 1, rq->nr_sectors);
181 ide_end_request(drive, 1, rq->nr_sectors);
184 printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
185 drive->name, dma_stat);
187 return ide_error(drive, "dma_intr", stat);
190 EXPORT_SYMBOL_GPL(ide_dma_intr);
192 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
194 * ide_build_sglist - map IDE scatter gather for DMA I/O
195 * @drive: the drive to build the DMA table for
196 * @rq: the request holding the sg list
198 * Perform the PCI mapping magic necessary to access the source or
199 * target buffers of a request via PCI DMA. The lower layers of the
200 * kernel provide the necessary cache management so that we can
201 * operate in a portable fashion
204 int ide_build_sglist(ide_drive_t *drive, struct request *rq)
206 ide_hwif_t *hwif = HWIF(drive);
207 struct scatterlist *sg = hwif->sg_table;
209 BUG_ON((rq->cmd_type == REQ_TYPE_ATA_TASKFILE) && rq->nr_sectors > 256);
211 ide_map_sg(drive, rq);
213 if (rq_data_dir(rq) == READ)
214 hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
216 hwif->sg_dma_direction = PCI_DMA_TODEVICE;
218 return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
221 EXPORT_SYMBOL_GPL(ide_build_sglist);
224 * ide_build_dmatable - build IDE DMA table
226 * ide_build_dmatable() prepares a dma request. We map the command
227 * to get the pci bus addresses of the buffers and then build up
228 * the PRD table that the IDE layer wants to be fed. The code
229 * knows about the 64K wrap bug in the CS5530.
231 * Returns the number of built PRD entries if all went okay,
232 * returns 0 otherwise.
234 * May also be invoked from trm290.c
237 int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
239 ide_hwif_t *hwif = HWIF(drive);
240 unsigned int *table = hwif->dmatable_cpu;
241 unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
242 unsigned int count = 0;
244 struct scatterlist *sg;
246 hwif->sg_nents = i = ide_build_sglist(drive, rq);
256 cur_addr = sg_dma_address(sg);
257 cur_len = sg_dma_len(sg);
260 * Fill in the dma table, without crossing any 64kB boundaries.
261 * Most hardware requires 16-bit alignment of all blocks,
262 * but the trm290 requires 32-bit alignment.
266 if (count++ >= PRD_ENTRIES) {
267 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
268 goto use_pio_instead;
270 u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
272 if (bcount > cur_len)
274 *table++ = cpu_to_le32(cur_addr);
275 xcount = bcount & 0xffff;
277 xcount = ((xcount >> 2) - 1) << 16;
278 if (xcount == 0x0000) {
280 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
281 * but at least one (e.g. CS5530) misinterprets it as zero (!).
282 * So here we break the 64KB entry into two 32KB entries instead.
284 if (count++ >= PRD_ENTRIES) {
285 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
286 goto use_pio_instead;
288 *table++ = cpu_to_le32(0x8000);
289 *table++ = cpu_to_le32(cur_addr + 0x8000);
292 *table++ = cpu_to_le32(xcount);
304 *--table |= cpu_to_le32(0x80000000);
307 printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
309 pci_unmap_sg(hwif->pci_dev,
312 hwif->sg_dma_direction);
313 return 0; /* revert to PIO for this request */
316 EXPORT_SYMBOL_GPL(ide_build_dmatable);
319 * ide_destroy_dmatable - clean up DMA mapping
320 * @drive: The drive to unmap
322 * Teardown mappings after DMA has completed. This must be called
323 * after the completion of each use of ide_build_dmatable and before
324 * the next use of ide_build_dmatable. Failure to do so will cause
325 * an oops as only one mapping can be live for each target at a given
329 void ide_destroy_dmatable (ide_drive_t *drive)
331 struct pci_dev *dev = HWIF(drive)->pci_dev;
332 struct scatterlist *sg = HWIF(drive)->sg_table;
333 int nents = HWIF(drive)->sg_nents;
335 pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
338 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
341 * config_drive_for_dma - attempt to activate IDE DMA
342 * @drive: the drive to place in DMA mode
344 * If the drive supports at least mode 2 DMA or UDMA of any kind
345 * then attempt to place it into DMA mode. Drives that are known to
346 * support DMA but predate the DMA properties or that are known
347 * to have DMA handling bugs are also set up appropriately based
348 * on the good/bad drive lists.
351 static int config_drive_for_dma (ide_drive_t *drive)
353 struct hd_driveid *id = drive->id;
355 if ((id->capability & 1) && drive->hwif->autodma) {
357 * Enable DMA on any drive that has
358 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
360 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
363 * Enable DMA on any drive that has mode2 DMA
364 * (multi or single) enabled
366 if (id->field_valid & 2) /* regular DMA */
367 if ((id->dma_mword & 0x404) == 0x404 ||
368 (id->dma_1word & 0x404) == 0x404)
371 /* Consult the list of known "good" drives */
372 if (__ide_dma_good_drive(drive))
380 * dma_timer_expiry - handle a DMA timeout
381 * @drive: Drive that timed out
383 * An IDE DMA transfer timed out. In the event of an error we ask
384 * the driver to resolve the problem, if a DMA transfer is still
385 * in progress we continue to wait (arguably we need to add a
386 * secondary 'I don't care what the drive thinks' timeout here)
387 * Finally if we have an interrupt we let it complete the I/O.
388 * But only one time - we clear expiry and if it's still not
389 * completed after WAIT_CMD, we error and retry in PIO.
390 * This can occur if an interrupt is lost or due to hang or bugs.
393 static int dma_timer_expiry (ide_drive_t *drive)
395 ide_hwif_t *hwif = HWIF(drive);
396 u8 dma_stat = hwif->INB(hwif->dma_status);
398 printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
399 drive->name, dma_stat);
401 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
404 HWGROUP(drive)->expiry = NULL; /* one free ride for now */
406 /* 1 dmaing, 2 error, 4 intr */
407 if (dma_stat & 2) /* ERROR */
410 if (dma_stat & 1) /* DMAing */
413 if (dma_stat & 4) /* Got an Interrupt */
416 return 0; /* Status is unknown -- reset the bus */
420 * ide_dma_host_off - Generic DMA kill
421 * @drive: drive to control
423 * Perform the generic IDE controller DMA off operation. This
424 * works for most IDE bus mastering controllers
427 void ide_dma_host_off(ide_drive_t *drive)
429 ide_hwif_t *hwif = HWIF(drive);
430 u8 unit = (drive->select.b.unit & 0x01);
431 u8 dma_stat = hwif->INB(hwif->dma_status);
433 hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
436 EXPORT_SYMBOL(ide_dma_host_off);
439 * ide_dma_off_quietly - Generic DMA kill
440 * @drive: drive to control
442 * Turn off the current DMA on this IDE controller.
445 void ide_dma_off_quietly(ide_drive_t *drive)
447 drive->using_dma = 0;
448 ide_toggle_bounce(drive, 0);
450 drive->hwif->dma_host_off(drive);
453 EXPORT_SYMBOL(ide_dma_off_quietly);
454 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
457 * ide_dma_off - disable DMA on a device
458 * @drive: drive to disable DMA on
460 * Disable IDE DMA for a device on this IDE controller.
461 * Inform the user that DMA has been disabled.
464 void ide_dma_off(ide_drive_t *drive)
466 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
467 drive->hwif->dma_off_quietly(drive);
470 EXPORT_SYMBOL(ide_dma_off);
472 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
474 * ide_dma_host_on - Enable DMA on a host
475 * @drive: drive to enable for DMA
477 * Enable DMA on an IDE controller following generic bus mastering
478 * IDE controller behaviour
481 void ide_dma_host_on(ide_drive_t *drive)
483 if (drive->using_dma) {
484 ide_hwif_t *hwif = HWIF(drive);
485 u8 unit = (drive->select.b.unit & 0x01);
486 u8 dma_stat = hwif->INB(hwif->dma_status);
488 hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
492 EXPORT_SYMBOL(ide_dma_host_on);
495 * __ide_dma_on - Enable DMA on a device
496 * @drive: drive to enable DMA on
498 * Enable IDE DMA for a device on this IDE controller.
501 int __ide_dma_on (ide_drive_t *drive)
503 /* consult the list of known "bad" drives */
504 if (__ide_dma_bad_drive(drive))
507 drive->using_dma = 1;
508 ide_toggle_bounce(drive, 1);
510 drive->hwif->dma_host_on(drive);
515 EXPORT_SYMBOL(__ide_dma_on);
518 * __ide_dma_check - check DMA setup
519 * @drive: drive to check
521 * Don't use - due for extermination
524 int __ide_dma_check (ide_drive_t *drive)
526 return config_drive_for_dma(drive);
529 EXPORT_SYMBOL(__ide_dma_check);
532 * ide_dma_setup - begin a DMA phase
533 * @drive: target device
535 * Build an IDE DMA PRD (IDE speak for scatter gather table)
536 * and then set up the DMA transfer registers for a device
537 * that follows generic IDE PCI DMA behaviour. Controllers can
538 * override this function if they need to
540 * Returns 0 on success. If a PIO fallback is required then 1
544 int ide_dma_setup(ide_drive_t *drive)
546 ide_hwif_t *hwif = drive->hwif;
547 struct request *rq = HWGROUP(drive)->rq;
548 unsigned int reading;
556 /* fall back to pio! */
557 if (!ide_build_dmatable(drive, rq)) {
558 ide_map_sg(drive, rq);
564 writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
566 outl(hwif->dmatable_dma, hwif->dma_prdtable);
569 hwif->OUTB(reading, hwif->dma_command);
571 /* read dma_status for INTR & ERROR flags */
572 dma_stat = hwif->INB(hwif->dma_status);
574 /* clear INTR & ERROR flags */
575 hwif->OUTB(dma_stat|6, hwif->dma_status);
576 drive->waiting_for_dma = 1;
580 EXPORT_SYMBOL_GPL(ide_dma_setup);
582 static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
584 /* issue cmd to drive */
585 ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
588 void ide_dma_start(ide_drive_t *drive)
590 ide_hwif_t *hwif = HWIF(drive);
591 u8 dma_cmd = hwif->INB(hwif->dma_command);
593 /* Note that this is done *after* the cmd has
594 * been issued to the drive, as per the BM-IDE spec.
595 * The Promise Ultra33 doesn't work correctly when
596 * we do this part before issuing the drive cmd.
599 hwif->OUTB(dma_cmd|1, hwif->dma_command);
604 EXPORT_SYMBOL_GPL(ide_dma_start);
606 /* returns 1 on error, 0 otherwise */
607 int __ide_dma_end (ide_drive_t *drive)
609 ide_hwif_t *hwif = HWIF(drive);
610 u8 dma_stat = 0, dma_cmd = 0;
612 drive->waiting_for_dma = 0;
613 /* get dma_command mode */
614 dma_cmd = hwif->INB(hwif->dma_command);
616 hwif->OUTB(dma_cmd&~1, hwif->dma_command);
618 dma_stat = hwif->INB(hwif->dma_status);
619 /* clear the INTR & ERROR bits */
620 hwif->OUTB(dma_stat|6, hwif->dma_status);
621 /* purge DMA mappings */
622 ide_destroy_dmatable(drive);
623 /* verify good DMA status */
626 return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
629 EXPORT_SYMBOL(__ide_dma_end);
631 /* returns 1 if dma irq issued, 0 otherwise */
632 static int __ide_dma_test_irq(ide_drive_t *drive)
634 ide_hwif_t *hwif = HWIF(drive);
635 u8 dma_stat = hwif->INB(hwif->dma_status);
637 #if 0 /* do not set unless you know what you are doing */
639 u8 stat = hwif->INB(IDE_STATUS_REG);
640 hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
643 /* return 1 if INTR asserted */
644 if ((dma_stat & 4) == 4)
646 if (!drive->waiting_for_dma)
647 printk(KERN_WARNING "%s: (%s) called while not waiting\n",
648 drive->name, __FUNCTION__);
651 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
653 int __ide_dma_bad_drive (ide_drive_t *drive)
655 struct hd_driveid *id = drive->id;
657 int blacklist = ide_in_drive_list(id, drive_blacklist);
659 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
660 drive->name, id->model);
666 EXPORT_SYMBOL(__ide_dma_bad_drive);
668 int __ide_dma_good_drive (ide_drive_t *drive)
670 struct hd_driveid *id = drive->id;
671 return ide_in_drive_list(id, drive_whitelist);
674 EXPORT_SYMBOL(__ide_dma_good_drive);
676 static const u8 xfer_mode_bases[] = {
682 static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
684 struct hd_driveid *id = drive->id;
685 ide_hwif_t *hwif = drive->hwif;
686 unsigned int mask = 0;
690 if ((id->field_valid & 4) == 0)
693 mask = id->dma_ultra & hwif->ultra_mask;
695 if (hwif->udma_filter)
696 mask &= hwif->udma_filter(drive);
698 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
702 if (id->field_valid & 2)
703 mask = id->dma_mword & hwif->mwdma_mask;
706 if (id->field_valid & 2)
707 mask = id->dma_1word & hwif->swdma_mask;
718 * ide_max_dma_mode - compute DMA speed
721 * Checks the drive capabilities and returns the speed to use
722 * for the DMA transfer. Returns 0 if the drive is incapable
726 u8 ide_max_dma_mode(ide_drive_t *drive)
728 ide_hwif_t *hwif = drive->hwif;
733 if (drive->media != ide_disk && hwif->atapi_dma == 0)
736 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
737 mask = ide_get_mode_mask(drive, xfer_mode_bases[i]);
740 mode = xfer_mode_bases[i] + x;
745 printk(KERN_DEBUG "%s: selected mode 0x%x\n", drive->name, mode);
750 EXPORT_SYMBOL_GPL(ide_max_dma_mode);
752 int ide_tune_dma(ide_drive_t *drive)
756 if ((drive->id->capability & 1) == 0 || drive->autodma == 0)
759 /* consult the list of known "bad" drives */
760 if (__ide_dma_bad_drive(drive))
763 speed = ide_max_dma_mode(drive);
768 if (drive->hwif->speedproc(drive, speed))
774 EXPORT_SYMBOL_GPL(ide_tune_dma);
776 void ide_dma_verbose(ide_drive_t *drive)
778 struct hd_driveid *id = drive->id;
779 ide_hwif_t *hwif = HWIF(drive);
781 if (id->field_valid & 4) {
782 if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
784 if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
785 if (((id->dma_ultra >> 11) & 0x1F) &&
786 eighty_ninty_three(drive)) {
787 if ((id->dma_ultra >> 15) & 1) {
788 printk(", UDMA(mode 7)");
789 } else if ((id->dma_ultra >> 14) & 1) {
790 printk(", UDMA(133)");
791 } else if ((id->dma_ultra >> 13) & 1) {
792 printk(", UDMA(100)");
793 } else if ((id->dma_ultra >> 12) & 1) {
794 printk(", UDMA(66)");
795 } else if ((id->dma_ultra >> 11) & 1) {
796 printk(", UDMA(44)");
801 if ((id->dma_ultra >> 10) & 1) {
802 printk(", UDMA(33)");
803 } else if ((id->dma_ultra >> 9) & 1) {
804 printk(", UDMA(25)");
805 } else if ((id->dma_ultra >> 8) & 1) {
806 printk(", UDMA(16)");
810 printk(", (U)DMA"); /* Can be BIOS-enabled! */
812 } else if (id->field_valid & 2) {
813 if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
816 } else if (id->field_valid & 1) {
821 printk(", BUG DMA OFF");
822 hwif->dma_off_quietly(drive);
826 EXPORT_SYMBOL(ide_dma_verbose);
828 int ide_set_dma(ide_drive_t *drive)
830 ide_hwif_t *hwif = drive->hwif;
833 rc = hwif->ide_dma_check(drive);
836 case -1: /* DMA needs to be disabled */
837 hwif->dma_off_quietly(drive);
839 case 0: /* DMA needs to be enabled */
840 return hwif->ide_dma_on(drive);
841 case 1: /* DMA setting cannot be changed */
851 EXPORT_SYMBOL_GPL(ide_set_dma);
853 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
854 void ide_dma_lost_irq (ide_drive_t *drive)
856 printk("%s: DMA interrupt recovery\n", drive->name);
859 EXPORT_SYMBOL(ide_dma_lost_irq);
861 void ide_dma_timeout (ide_drive_t *drive)
863 ide_hwif_t *hwif = HWIF(drive);
865 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
867 if (hwif->ide_dma_test_irq(drive))
870 hwif->ide_dma_end(drive);
873 EXPORT_SYMBOL(ide_dma_timeout);
876 * Needed for allowing full modular support of ide-driver
878 static int ide_release_dma_engine(ide_hwif_t *hwif)
880 if (hwif->dmatable_cpu) {
881 pci_free_consistent(hwif->pci_dev,
882 PRD_ENTRIES * PRD_BYTES,
885 hwif->dmatable_cpu = NULL;
890 static int ide_release_iomio_dma(ide_hwif_t *hwif)
892 release_region(hwif->dma_base, 8);
893 if (hwif->extra_ports)
894 release_region(hwif->extra_base, hwif->extra_ports);
899 * Needed for allowing full modular support of ide-driver
901 int ide_release_dma(ide_hwif_t *hwif)
903 ide_release_dma_engine(hwif);
908 return ide_release_iomio_dma(hwif);
911 static int ide_allocate_dma_engine(ide_hwif_t *hwif)
913 hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
914 PRD_ENTRIES * PRD_BYTES,
915 &hwif->dmatable_dma);
917 if (hwif->dmatable_cpu)
920 printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
926 static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
928 printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
930 hwif->dma_base = base;
933 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
935 hwif->dma_master = base;
939 static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
941 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
942 hwif->name, base, base + ports - 1);
944 if (!request_region(base, ports, hwif->name)) {
945 printk(" -- Error, ports in use.\n");
949 hwif->dma_base = base;
951 if (hwif->cds->extra) {
952 hwif->extra_base = base + (hwif->channel ? 8 : 16);
954 if (!hwif->mate || !hwif->mate->extra_ports) {
955 if (!request_region(hwif->extra_base,
956 hwif->cds->extra, hwif->cds->name)) {
957 printk(" -- Error, extra ports in use.\n");
958 release_region(base, ports);
961 hwif->extra_ports = hwif->cds->extra;
966 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base:base;
968 hwif->dma_master = base;
972 static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
975 return ide_mapped_mmio_dma(hwif, base,ports);
977 return ide_iomio_dma(hwif, base, ports);
981 * This can be called for a dynamically installed interface. Don't __init it
983 void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
985 if (ide_dma_iobase(hwif, dma_base, num_ports))
988 if (ide_allocate_dma_engine(hwif)) {
989 ide_release_dma(hwif);
993 if (!(hwif->dma_command))
994 hwif->dma_command = hwif->dma_base;
995 if (!(hwif->dma_vendor1))
996 hwif->dma_vendor1 = (hwif->dma_base + 1);
997 if (!(hwif->dma_status))
998 hwif->dma_status = (hwif->dma_base + 2);
999 if (!(hwif->dma_vendor3))
1000 hwif->dma_vendor3 = (hwif->dma_base + 3);
1001 if (!(hwif->dma_prdtable))
1002 hwif->dma_prdtable = (hwif->dma_base + 4);
1004 if (!hwif->dma_off_quietly)
1005 hwif->dma_off_quietly = &ide_dma_off_quietly;
1006 if (!hwif->dma_host_off)
1007 hwif->dma_host_off = &ide_dma_host_off;
1008 if (!hwif->ide_dma_on)
1009 hwif->ide_dma_on = &__ide_dma_on;
1010 if (!hwif->dma_host_on)
1011 hwif->dma_host_on = &ide_dma_host_on;
1012 if (!hwif->ide_dma_check)
1013 hwif->ide_dma_check = &__ide_dma_check;
1014 if (!hwif->dma_setup)
1015 hwif->dma_setup = &ide_dma_setup;
1016 if (!hwif->dma_exec_cmd)
1017 hwif->dma_exec_cmd = &ide_dma_exec_cmd;
1018 if (!hwif->dma_start)
1019 hwif->dma_start = &ide_dma_start;
1020 if (!hwif->ide_dma_end)
1021 hwif->ide_dma_end = &__ide_dma_end;
1022 if (!hwif->ide_dma_test_irq)
1023 hwif->ide_dma_test_irq = &__ide_dma_test_irq;
1024 if (!hwif->dma_timeout)
1025 hwif->dma_timeout = &ide_dma_timeout;
1026 if (!hwif->dma_lost_irq)
1027 hwif->dma_lost_irq = &ide_dma_lost_irq;
1029 if (hwif->chipset != ide_trm290) {
1030 u8 dma_stat = hwif->INB(hwif->dma_status);
1031 printk(", BIOS settings: %s:%s, %s:%s",
1032 hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
1033 hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
1037 BUG_ON(!hwif->dma_master);
1040 EXPORT_SYMBOL_GPL(ide_setup_dma);
1041 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */