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>
88 #include <linux/dma-mapping.h>
93 static const struct drive_list_entry drive_whitelist [] = {
95 { "Micropolis 2112A" , NULL },
96 { "CONNER CTMA 4000" , NULL },
97 { "CONNER CTT8000-A" , NULL },
98 { "ST34342A" , NULL },
102 static const struct drive_list_entry drive_blacklist [] = {
104 { "WDC AC11000H" , NULL },
105 { "WDC AC22100H" , NULL },
106 { "WDC AC32500H" , NULL },
107 { "WDC AC33100H" , NULL },
108 { "WDC AC31600H" , NULL },
109 { "WDC AC32100H" , "24.09P07" },
110 { "WDC AC23200L" , "21.10N21" },
111 { "Compaq CRD-8241B" , NULL },
112 { "CRD-8400B" , NULL },
113 { "CRD-8480B", NULL },
114 { "CRD-8482B", NULL },
116 { "SanDisk SDP3B" , NULL },
117 { "SanDisk SDP3B-64" , NULL },
118 { "SANYO CD-ROM CRD" , NULL },
119 { "HITACHI CDR-8" , NULL },
120 { "HITACHI CDR-8335" , NULL },
121 { "HITACHI CDR-8435" , NULL },
122 { "Toshiba CD-ROM XM-6202B" , NULL },
123 { "TOSHIBA CD-ROM XM-1702BC", NULL },
124 { "CD-532E-A" , NULL },
125 { "E-IDE CD-ROM CR-840", NULL },
126 { "CD-ROM Drive/F5A", NULL },
127 { "WPI CDD-820", NULL },
128 { "SAMSUNG CD-ROM SC-148C", NULL },
129 { "SAMSUNG CD-ROM SC", NULL },
130 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", NULL },
131 { "_NEC DV5800A", NULL },
132 { "SAMSUNG CD-ROM SN-124", "N001" },
133 { "Seagate STT20000A", NULL },
134 { "CD-ROM CDR_U200", "1.09" },
140 * ide_dma_intr - IDE DMA interrupt handler
141 * @drive: the drive the interrupt is for
143 * Handle an interrupt completing a read/write DMA transfer on an
147 ide_startstop_t ide_dma_intr (ide_drive_t *drive)
149 u8 stat = 0, dma_stat = 0;
151 dma_stat = HWIF(drive)->ide_dma_end(drive);
152 stat = HWIF(drive)->INB(IDE_STATUS_REG); /* get drive status */
153 if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
155 struct request *rq = HWGROUP(drive)->rq;
157 task_end_request(drive, rq, stat);
160 printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
161 drive->name, dma_stat);
163 return ide_error(drive, "dma_intr", stat);
166 EXPORT_SYMBOL_GPL(ide_dma_intr);
168 static int ide_dma_good_drive(ide_drive_t *drive)
170 return ide_in_drive_list(drive->id, drive_whitelist);
174 * ide_build_sglist - map IDE scatter gather for DMA I/O
175 * @drive: the drive to build the DMA table for
176 * @rq: the request holding the sg list
178 * Perform the DMA mapping magic necessary to access the source or
179 * target buffers of a request via DMA. The lower layers of the
180 * kernel provide the necessary cache management so that we can
181 * operate in a portable fashion.
184 int ide_build_sglist(ide_drive_t *drive, struct request *rq)
186 ide_hwif_t *hwif = HWIF(drive);
187 struct scatterlist *sg = hwif->sg_table;
189 ide_map_sg(drive, rq);
191 if (rq_data_dir(rq) == READ)
192 hwif->sg_dma_direction = DMA_FROM_DEVICE;
194 hwif->sg_dma_direction = DMA_TO_DEVICE;
196 return dma_map_sg(hwif->dev, sg, hwif->sg_nents,
197 hwif->sg_dma_direction);
200 EXPORT_SYMBOL_GPL(ide_build_sglist);
202 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
204 * ide_build_dmatable - build IDE DMA table
206 * ide_build_dmatable() prepares a dma request. We map the command
207 * to get the pci bus addresses of the buffers and then build up
208 * the PRD table that the IDE layer wants to be fed. The code
209 * knows about the 64K wrap bug in the CS5530.
211 * Returns the number of built PRD entries if all went okay,
212 * returns 0 otherwise.
214 * May also be invoked from trm290.c
217 int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
219 ide_hwif_t *hwif = HWIF(drive);
220 unsigned int *table = hwif->dmatable_cpu;
221 unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
222 unsigned int count = 0;
224 struct scatterlist *sg;
226 hwif->sg_nents = i = ide_build_sglist(drive, rq);
236 cur_addr = sg_dma_address(sg);
237 cur_len = sg_dma_len(sg);
240 * Fill in the dma table, without crossing any 64kB boundaries.
241 * Most hardware requires 16-bit alignment of all blocks,
242 * but the trm290 requires 32-bit alignment.
246 if (count++ >= PRD_ENTRIES) {
247 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
248 goto use_pio_instead;
250 u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
252 if (bcount > cur_len)
254 *table++ = cpu_to_le32(cur_addr);
255 xcount = bcount & 0xffff;
257 xcount = ((xcount >> 2) - 1) << 16;
258 if (xcount == 0x0000) {
260 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
261 * but at least one (e.g. CS5530) misinterprets it as zero (!).
262 * So here we break the 64KB entry into two 32KB entries instead.
264 if (count++ >= PRD_ENTRIES) {
265 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
266 goto use_pio_instead;
268 *table++ = cpu_to_le32(0x8000);
269 *table++ = cpu_to_le32(cur_addr + 0x8000);
272 *table++ = cpu_to_le32(xcount);
284 *--table |= cpu_to_le32(0x80000000);
288 printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
291 ide_destroy_dmatable(drive);
293 return 0; /* revert to PIO for this request */
296 EXPORT_SYMBOL_GPL(ide_build_dmatable);
300 * ide_destroy_dmatable - clean up DMA mapping
301 * @drive: The drive to unmap
303 * Teardown mappings after DMA has completed. This must be called
304 * after the completion of each use of ide_build_dmatable and before
305 * the next use of ide_build_dmatable. Failure to do so will cause
306 * an oops as only one mapping can be live for each target at a given
310 void ide_destroy_dmatable (ide_drive_t *drive)
312 ide_hwif_t *hwif = drive->hwif;
314 dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
315 hwif->sg_dma_direction);
318 EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
320 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
322 * config_drive_for_dma - attempt to activate IDE DMA
323 * @drive: the drive to place in DMA mode
325 * If the drive supports at least mode 2 DMA or UDMA of any kind
326 * then attempt to place it into DMA mode. Drives that are known to
327 * support DMA but predate the DMA properties or that are known
328 * to have DMA handling bugs are also set up appropriately based
329 * on the good/bad drive lists.
332 static int config_drive_for_dma (ide_drive_t *drive)
334 ide_hwif_t *hwif = drive->hwif;
335 struct hd_driveid *id = drive->id;
337 if (drive->media != ide_disk) {
338 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
343 * Enable DMA on any drive that has
344 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
346 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
350 * Enable DMA on any drive that has mode2 DMA
351 * (multi or single) enabled
353 if (id->field_valid & 2) /* regular DMA */
354 if ((id->dma_mword & 0x404) == 0x404 ||
355 (id->dma_1word & 0x404) == 0x404)
358 /* Consult the list of known "good" drives */
359 if (ide_dma_good_drive(drive))
366 * dma_timer_expiry - handle a DMA timeout
367 * @drive: Drive that timed out
369 * An IDE DMA transfer timed out. In the event of an error we ask
370 * the driver to resolve the problem, if a DMA transfer is still
371 * in progress we continue to wait (arguably we need to add a
372 * secondary 'I don't care what the drive thinks' timeout here)
373 * Finally if we have an interrupt we let it complete the I/O.
374 * But only one time - we clear expiry and if it's still not
375 * completed after WAIT_CMD, we error and retry in PIO.
376 * This can occur if an interrupt is lost or due to hang or bugs.
379 static int dma_timer_expiry (ide_drive_t *drive)
381 ide_hwif_t *hwif = HWIF(drive);
382 u8 dma_stat = hwif->INB(hwif->dma_status);
384 printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
385 drive->name, dma_stat);
387 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
390 HWGROUP(drive)->expiry = NULL; /* one free ride for now */
392 /* 1 dmaing, 2 error, 4 intr */
393 if (dma_stat & 2) /* ERROR */
396 if (dma_stat & 1) /* DMAing */
399 if (dma_stat & 4) /* Got an Interrupt */
402 return 0; /* Status is unknown -- reset the bus */
406 * ide_dma_host_set - Enable/disable DMA on a host
407 * @drive: drive to control
409 * Enable/disable DMA on an IDE controller following generic
410 * bus-mastering IDE controller behaviour.
413 void ide_dma_host_set(ide_drive_t *drive, int on)
415 ide_hwif_t *hwif = HWIF(drive);
416 u8 unit = (drive->select.b.unit & 0x01);
417 u8 dma_stat = hwif->INB(hwif->dma_status);
420 dma_stat |= (1 << (5 + unit));
422 dma_stat &= ~(1 << (5 + unit));
424 hwif->OUTB(dma_stat, hwif->dma_status);
427 EXPORT_SYMBOL_GPL(ide_dma_host_set);
428 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
431 * ide_dma_off_quietly - Generic DMA kill
432 * @drive: drive to control
434 * Turn off the current DMA on this IDE controller.
437 void ide_dma_off_quietly(ide_drive_t *drive)
439 drive->using_dma = 0;
440 ide_toggle_bounce(drive, 0);
442 drive->hwif->dma_host_set(drive, 0);
445 EXPORT_SYMBOL(ide_dma_off_quietly);
448 * ide_dma_off - disable DMA on a device
449 * @drive: drive to disable DMA on
451 * Disable IDE DMA for a device on this IDE controller.
452 * Inform the user that DMA has been disabled.
455 void ide_dma_off(ide_drive_t *drive)
457 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
458 ide_dma_off_quietly(drive);
461 EXPORT_SYMBOL(ide_dma_off);
464 * ide_dma_on - Enable DMA on a device
465 * @drive: drive to enable DMA on
467 * Enable IDE DMA for a device on this IDE controller.
470 void ide_dma_on(ide_drive_t *drive)
472 drive->using_dma = 1;
473 ide_toggle_bounce(drive, 1);
475 drive->hwif->dma_host_set(drive, 1);
478 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
480 * ide_dma_setup - begin a DMA phase
481 * @drive: target device
483 * Build an IDE DMA PRD (IDE speak for scatter gather table)
484 * and then set up the DMA transfer registers for a device
485 * that follows generic IDE PCI DMA behaviour. Controllers can
486 * override this function if they need to
488 * Returns 0 on success. If a PIO fallback is required then 1
492 int ide_dma_setup(ide_drive_t *drive)
494 ide_hwif_t *hwif = drive->hwif;
495 struct request *rq = HWGROUP(drive)->rq;
496 unsigned int reading;
504 /* fall back to pio! */
505 if (!ide_build_dmatable(drive, rq)) {
506 ide_map_sg(drive, rq);
512 writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
514 outl(hwif->dmatable_dma, hwif->dma_prdtable);
517 hwif->OUTB(reading, hwif->dma_command);
519 /* read dma_status for INTR & ERROR flags */
520 dma_stat = hwif->INB(hwif->dma_status);
522 /* clear INTR & ERROR flags */
523 hwif->OUTB(dma_stat|6, hwif->dma_status);
524 drive->waiting_for_dma = 1;
528 EXPORT_SYMBOL_GPL(ide_dma_setup);
530 static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
532 /* issue cmd to drive */
533 ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
536 void ide_dma_start(ide_drive_t *drive)
538 ide_hwif_t *hwif = HWIF(drive);
539 u8 dma_cmd = hwif->INB(hwif->dma_command);
541 /* Note that this is done *after* the cmd has
542 * been issued to the drive, as per the BM-IDE spec.
543 * The Promise Ultra33 doesn't work correctly when
544 * we do this part before issuing the drive cmd.
547 hwif->OUTB(dma_cmd|1, hwif->dma_command);
552 EXPORT_SYMBOL_GPL(ide_dma_start);
554 /* returns 1 on error, 0 otherwise */
555 int __ide_dma_end (ide_drive_t *drive)
557 ide_hwif_t *hwif = HWIF(drive);
558 u8 dma_stat = 0, dma_cmd = 0;
560 drive->waiting_for_dma = 0;
561 /* get dma_command mode */
562 dma_cmd = hwif->INB(hwif->dma_command);
564 hwif->OUTB(dma_cmd&~1, hwif->dma_command);
566 dma_stat = hwif->INB(hwif->dma_status);
567 /* clear the INTR & ERROR bits */
568 hwif->OUTB(dma_stat|6, hwif->dma_status);
569 /* purge DMA mappings */
570 ide_destroy_dmatable(drive);
571 /* verify good DMA status */
574 return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
577 EXPORT_SYMBOL(__ide_dma_end);
579 /* returns 1 if dma irq issued, 0 otherwise */
580 static int __ide_dma_test_irq(ide_drive_t *drive)
582 ide_hwif_t *hwif = HWIF(drive);
583 u8 dma_stat = hwif->INB(hwif->dma_status);
585 /* return 1 if INTR asserted */
586 if ((dma_stat & 4) == 4)
588 if (!drive->waiting_for_dma)
589 printk(KERN_WARNING "%s: (%s) called while not waiting\n",
590 drive->name, __FUNCTION__);
594 static inline int config_drive_for_dma(ide_drive_t *drive) { return 0; }
595 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
597 int __ide_dma_bad_drive (ide_drive_t *drive)
599 struct hd_driveid *id = drive->id;
601 int blacklist = ide_in_drive_list(id, drive_blacklist);
603 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
604 drive->name, id->model);
610 EXPORT_SYMBOL(__ide_dma_bad_drive);
612 static const u8 xfer_mode_bases[] = {
618 static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
620 struct hd_driveid *id = drive->id;
621 ide_hwif_t *hwif = drive->hwif;
622 unsigned int mask = 0;
626 if ((id->field_valid & 4) == 0)
629 if (hwif->udma_filter)
630 mask = hwif->udma_filter(drive);
632 mask = hwif->ultra_mask;
633 mask &= id->dma_ultra;
636 * avoid false cable warning from eighty_ninty_three()
638 if (req_mode > XFER_UDMA_2) {
639 if ((mask & 0x78) && (eighty_ninty_three(drive) == 0))
644 if ((id->field_valid & 2) == 0)
646 if (hwif->mdma_filter)
647 mask = hwif->mdma_filter(drive);
649 mask = hwif->mwdma_mask;
650 mask &= id->dma_mword;
653 if (id->field_valid & 2) {
654 mask = id->dma_1word & hwif->swdma_mask;
655 } else if (id->tDMA) {
657 * ide_fix_driveid() doesn't convert ->tDMA to the
658 * CPU endianness so we need to do it here
660 u8 mode = le16_to_cpu(id->tDMA);
663 * if the mode is valid convert it to the mask
664 * (the maximum allowed mode is XFER_SW_DMA_2)
667 mask = ((2 << mode) - 1) & hwif->swdma_mask;
679 * ide_find_dma_mode - compute DMA speed
681 * @req_mode: requested mode
683 * Checks the drive/host capabilities and finds the speed to use for
684 * the DMA transfer. The speed is then limited by the requested mode.
686 * Returns 0 if the drive/host combination is incapable of DMA transfers
687 * or if the requested mode is not a DMA mode.
690 u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
692 ide_hwif_t *hwif = drive->hwif;
697 if (drive->media != ide_disk) {
698 if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
702 for (i = 0; i < ARRAY_SIZE(xfer_mode_bases); i++) {
703 if (req_mode < xfer_mode_bases[i])
705 mask = ide_get_mode_mask(drive, xfer_mode_bases[i], req_mode);
708 mode = xfer_mode_bases[i] + x;
713 if (hwif->chipset == ide_acorn && mode == 0) {
717 if (ide_dma_good_drive(drive) && drive->id->eide_dma_time < 150)
718 mode = XFER_MW_DMA_1;
721 mode = min(mode, req_mode);
723 printk(KERN_INFO "%s: %s mode selected\n", drive->name,
724 mode ? ide_xfer_verbose(mode) : "no DMA");
729 EXPORT_SYMBOL_GPL(ide_find_dma_mode);
731 static int ide_tune_dma(ide_drive_t *drive)
733 ide_hwif_t *hwif = drive->hwif;
736 if (noautodma || drive->nodma || (drive->id->capability & 1) == 0)
739 /* consult the list of known "bad" drives */
740 if (__ide_dma_bad_drive(drive))
743 if (ide_id_dma_bug(drive))
746 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
747 return config_drive_for_dma(drive);
749 speed = ide_max_dma_mode(drive);
752 /* is this really correct/needed? */
753 if ((hwif->host_flags & IDE_HFLAG_CY82C693) &&
754 ide_dma_good_drive(drive))
760 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
763 if (ide_set_dma_mode(drive, speed))
769 static int ide_dma_check(ide_drive_t *drive)
771 ide_hwif_t *hwif = drive->hwif;
772 int vdma = (hwif->host_flags & IDE_HFLAG_VDMA)? 1 : 0;
774 if (!vdma && ide_tune_dma(drive))
777 /* TODO: always do PIO fallback */
778 if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
781 ide_set_max_pio(drive);
783 return vdma ? 0 : -1;
786 int ide_id_dma_bug(ide_drive_t *drive)
788 struct hd_driveid *id = drive->id;
790 if (id->field_valid & 4) {
791 if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
793 } else if (id->field_valid & 2) {
794 if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
799 printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name);
803 int ide_set_dma(ide_drive_t *drive)
808 * Force DMAing for the beginning of the check.
809 * Some chipsets appear to do interesting
810 * things, if not checked and cleared.
813 ide_dma_off_quietly(drive);
815 rc = ide_dma_check(drive);
824 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
825 void ide_dma_lost_irq (ide_drive_t *drive)
827 printk("%s: DMA interrupt recovery\n", drive->name);
830 EXPORT_SYMBOL(ide_dma_lost_irq);
832 void ide_dma_timeout (ide_drive_t *drive)
834 ide_hwif_t *hwif = HWIF(drive);
836 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
838 if (hwif->ide_dma_test_irq(drive))
841 hwif->ide_dma_end(drive);
844 EXPORT_SYMBOL(ide_dma_timeout);
846 static void ide_release_dma_engine(ide_hwif_t *hwif)
848 if (hwif->dmatable_cpu) {
849 struct pci_dev *pdev = to_pci_dev(hwif->dev);
851 pci_free_consistent(pdev, PRD_ENTRIES * PRD_BYTES,
852 hwif->dmatable_cpu, hwif->dmatable_dma);
853 hwif->dmatable_cpu = NULL;
857 static int ide_release_iomio_dma(ide_hwif_t *hwif)
859 release_region(hwif->dma_base, 8);
860 if (hwif->extra_ports)
861 release_region(hwif->extra_base, hwif->extra_ports);
866 * Needed for allowing full modular support of ide-driver
868 int ide_release_dma(ide_hwif_t *hwif)
870 ide_release_dma_engine(hwif);
875 return ide_release_iomio_dma(hwif);
878 static int ide_allocate_dma_engine(ide_hwif_t *hwif)
880 struct pci_dev *pdev = to_pci_dev(hwif->dev);
882 hwif->dmatable_cpu = pci_alloc_consistent(pdev,
883 PRD_ENTRIES * PRD_BYTES,
884 &hwif->dmatable_dma);
886 if (hwif->dmatable_cpu)
889 printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n",
895 static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base)
897 printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
902 static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base)
904 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
905 hwif->name, base, base + 7);
907 if (!request_region(base, 8, hwif->name)) {
908 printk(" -- Error, ports in use.\n");
912 if (hwif->cds->extra) {
913 hwif->extra_base = base + (hwif->channel ? 8 : 16);
915 if (!hwif->mate || !hwif->mate->extra_ports) {
916 if (!request_region(hwif->extra_base,
917 hwif->cds->extra, hwif->cds->name)) {
918 printk(" -- Error, extra ports in use.\n");
919 release_region(base, 8);
922 hwif->extra_ports = hwif->cds->extra;
929 static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base)
932 return ide_mapped_mmio_dma(hwif, base);
934 return ide_iomio_dma(hwif, base);
937 void ide_setup_dma(ide_hwif_t *hwif, unsigned long base)
941 if (ide_dma_iobase(hwif, base))
944 if (ide_allocate_dma_engine(hwif)) {
945 ide_release_dma(hwif);
949 hwif->dma_base = base;
951 if (!hwif->dma_command)
952 hwif->dma_command = hwif->dma_base + 0;
953 if (!hwif->dma_vendor1)
954 hwif->dma_vendor1 = hwif->dma_base + 1;
955 if (!hwif->dma_status)
956 hwif->dma_status = hwif->dma_base + 2;
957 if (!hwif->dma_vendor3)
958 hwif->dma_vendor3 = hwif->dma_base + 3;
959 if (!hwif->dma_prdtable)
960 hwif->dma_prdtable = hwif->dma_base + 4;
962 if (!hwif->dma_host_set)
963 hwif->dma_host_set = &ide_dma_host_set;
964 if (!hwif->dma_setup)
965 hwif->dma_setup = &ide_dma_setup;
966 if (!hwif->dma_exec_cmd)
967 hwif->dma_exec_cmd = &ide_dma_exec_cmd;
968 if (!hwif->dma_start)
969 hwif->dma_start = &ide_dma_start;
970 if (!hwif->ide_dma_end)
971 hwif->ide_dma_end = &__ide_dma_end;
972 if (!hwif->ide_dma_test_irq)
973 hwif->ide_dma_test_irq = &__ide_dma_test_irq;
974 if (!hwif->dma_timeout)
975 hwif->dma_timeout = &ide_dma_timeout;
976 if (!hwif->dma_lost_irq)
977 hwif->dma_lost_irq = &ide_dma_lost_irq;
979 dma_stat = hwif->INB(hwif->dma_status);
980 printk(KERN_CONT ", BIOS settings: %s:%s, %s:%s\n",
981 hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "PIO",
982 hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "PIO");
985 EXPORT_SYMBOL_GPL(ide_setup_dma);
986 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */