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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/ide/ide-dma.c Version 4.10 June 9, 2000
3 *
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
6 */
7
8/*
9 * Special Thanks to Mark for his Six years of work.
10 *
11 * Copyright (c) 1995-1998 Mark Lord
12 * May be copied or modified under the terms of the GNU General Public License
13 */
14
15/*
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").
21 *
22 * Pretty much the same code works for other IDE PCI bus-mastering chipsets.
23 *
24 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
25 *
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.
31 *
32 * Use "hdparm -i" to view modes supported by a given drive.
33 *
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.
36 *
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.
40 *
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.
46 *
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.
51 *
52 * Keep an eye on /var/adm/messages for "DMA disabled" messages.
53 *
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).
58 *
59 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
60 * fixing the problem with the BIOS on some Acer motherboards.
61 *
62 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
63 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
64 *
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.
67 *
68 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
69 * for supplying a Promise UDMA board & WD UDMA drive for this work!
70 *
71 * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
72 *
73 * ATA-66/100 and recovery functions, I forgot the rest......
74 *
75 */
76
77#include <linux/config.h>
78#include <linux/module.h>
79#include <linux/types.h>
80#include <linux/kernel.h>
81#include <linux/timer.h>
82#include <linux/mm.h>
83#include <linux/interrupt.h>
84#include <linux/pci.h>
85#include <linux/init.h>
86#include <linux/ide.h>
87#include <linux/delay.h>
88#include <linux/scatterlist.h>
89
90#include <asm/io.h>
91#include <asm/irq.h>
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093static const struct drive_list_entry drive_whitelist [] = {
94
95 { "Micropolis 2112A" , "ALL" },
96 { "CONNER CTMA 4000" , "ALL" },
97 { "CONNER CTT8000-A" , "ALL" },
98 { "ST34342A" , "ALL" },
99 { NULL , NULL }
100};
101
102static const struct drive_list_entry drive_blacklist [] = {
103
104 { "WDC AC11000H" , "ALL" },
105 { "WDC AC22100H" , "ALL" },
106 { "WDC AC32500H" , "ALL" },
107 { "WDC AC33100H" , "ALL" },
108 { "WDC AC31600H" , "ALL" },
109 { "WDC AC32100H" , "24.09P07" },
110 { "WDC AC23200L" , "21.10N21" },
111 { "Compaq CRD-8241B" , "ALL" },
112 { "CRD-8400B" , "ALL" },
113 { "CRD-8480B", "ALL" },
114 { "CRD-8482B", "ALL" },
115 { "CRD-84" , "ALL" },
116 { "SanDisk SDP3B" , "ALL" },
117 { "SanDisk SDP3B-64" , "ALL" },
118 { "SANYO CD-ROM CRD" , "ALL" },
119 { "HITACHI CDR-8" , "ALL" },
120 { "HITACHI CDR-8335" , "ALL" },
121 { "HITACHI CDR-8435" , "ALL" },
122 { "Toshiba CD-ROM XM-6202B" , "ALL" },
123 { "CD-532E-A" , "ALL" },
124 { "E-IDE CD-ROM CR-840", "ALL" },
125 { "CD-ROM Drive/F5A", "ALL" },
126 { "WPI CDD-820", "ALL" },
127 { "SAMSUNG CD-ROM SC-148C", "ALL" },
128 { "SAMSUNG CD-ROM SC", "ALL" },
129 { "SanDisk SDP3B-64" , "ALL" },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 { "ATAPI CD-ROM DRIVE 40X MAXIMUM", "ALL" },
131 { "_NEC DV5800A", "ALL" },
132 { NULL , NULL }
133
134};
135
136/**
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100137 * ide_in_drive_list - look for drive in black/white list
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * @id: drive identifier
139 * @drive_table: list to inspect
140 *
141 * Look for a drive in the blacklist and the whitelist tables
142 * Returns 1 if the drive is found in the table.
143 */
144
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100145int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 for ( ; drive_table->id_model ; drive_table++)
148 if ((!strcmp(drive_table->id_model, id->model)) &&
149 ((strstr(drive_table->id_firmware, id->fw_rev)) ||
150 (!strcmp(drive_table->id_firmware, "ALL"))))
151 return 1;
152 return 0;
153}
154
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100155EXPORT_SYMBOL_GPL(ide_in_drive_list);
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157/**
158 * ide_dma_intr - IDE DMA interrupt handler
159 * @drive: the drive the interrupt is for
160 *
161 * Handle an interrupt completing a read/write DMA transfer on an
162 * IDE device
163 */
164
165ide_startstop_t ide_dma_intr (ide_drive_t *drive)
166{
167 u8 stat = 0, dma_stat = 0;
168
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)) {
172 if (!dma_stat) {
173 struct request *rq = HWGROUP(drive)->rq;
174
175 if (rq->rq_disk) {
176 ide_driver_t *drv;
177
Alexey Dobriyan53b35312006-03-24 03:16:13 -0800178 drv = *(ide_driver_t **)rq->rq_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 drv->end_request(drive, 1, rq->nr_sectors);
180 } else
181 ide_end_request(drive, 1, rq->nr_sectors);
182 return ide_stopped;
183 }
184 printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
185 drive->name, dma_stat);
186 }
187 return ide_error(drive, "dma_intr", stat);
188}
189
190EXPORT_SYMBOL_GPL(ide_dma_intr);
191
192#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
193/**
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
197 *
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
202 */
203
204int ide_build_sglist(ide_drive_t *drive, struct request *rq)
205{
206 ide_hwif_t *hwif = HWIF(drive);
207 struct scatterlist *sg = hwif->sg_table;
208
209 if ((rq->flags & REQ_DRIVE_TASKFILE) && rq->nr_sectors > 256)
210 BUG();
211
212 ide_map_sg(drive, rq);
213
214 if (rq_data_dir(rq) == READ)
215 hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
216 else
217 hwif->sg_dma_direction = PCI_DMA_TODEVICE;
218
219 return pci_map_sg(hwif->pci_dev, sg, hwif->sg_nents, hwif->sg_dma_direction);
220}
221
222EXPORT_SYMBOL_GPL(ide_build_sglist);
223
224/**
225 * ide_build_dmatable - build IDE DMA table
226 *
227 * ide_build_dmatable() prepares a dma request. We map the command
228 * to get the pci bus addresses of the buffers and then build up
229 * the PRD table that the IDE layer wants to be fed. The code
230 * knows about the 64K wrap bug in the CS5530.
231 *
232 * Returns the number of built PRD entries if all went okay,
233 * returns 0 otherwise.
234 *
235 * May also be invoked from trm290.c
236 */
237
238int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
239{
240 ide_hwif_t *hwif = HWIF(drive);
241 unsigned int *table = hwif->dmatable_cpu;
242 unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0;
243 unsigned int count = 0;
244 int i;
245 struct scatterlist *sg;
246
247 hwif->sg_nents = i = ide_build_sglist(drive, rq);
248
249 if (!i)
250 return 0;
251
252 sg = hwif->sg_table;
253 while (i) {
254 u32 cur_addr;
255 u32 cur_len;
256
257 cur_addr = sg_dma_address(sg);
258 cur_len = sg_dma_len(sg);
259
260 /*
261 * Fill in the dma table, without crossing any 64kB boundaries.
262 * Most hardware requires 16-bit alignment of all blocks,
263 * but the trm290 requires 32-bit alignment.
264 */
265
266 while (cur_len) {
267 if (count++ >= PRD_ENTRIES) {
268 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
269 goto use_pio_instead;
270 } else {
271 u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff);
272
273 if (bcount > cur_len)
274 bcount = cur_len;
275 *table++ = cpu_to_le32(cur_addr);
276 xcount = bcount & 0xffff;
277 if (is_trm290)
278 xcount = ((xcount >> 2) - 1) << 16;
279 if (xcount == 0x0000) {
280 /*
281 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
282 * but at least one (e.g. CS5530) misinterprets it as zero (!).
283 * So here we break the 64KB entry into two 32KB entries instead.
284 */
285 if (count++ >= PRD_ENTRIES) {
286 printk(KERN_ERR "%s: DMA table too small\n", drive->name);
287 goto use_pio_instead;
288 }
289 *table++ = cpu_to_le32(0x8000);
290 *table++ = cpu_to_le32(cur_addr + 0x8000);
291 xcount = 0x8000;
292 }
293 *table++ = cpu_to_le32(xcount);
294 cur_addr += bcount;
295 cur_len -= bcount;
296 }
297 }
298
299 sg++;
300 i--;
301 }
302
303 if (count) {
304 if (!is_trm290)
305 *--table |= cpu_to_le32(0x80000000);
306 return count;
307 }
308 printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
309use_pio_instead:
310 pci_unmap_sg(hwif->pci_dev,
311 hwif->sg_table,
312 hwif->sg_nents,
313 hwif->sg_dma_direction);
314 return 0; /* revert to PIO for this request */
315}
316
317EXPORT_SYMBOL_GPL(ide_build_dmatable);
318
319/**
320 * ide_destroy_dmatable - clean up DMA mapping
321 * @drive: The drive to unmap
322 *
323 * Teardown mappings after DMA has completed. This must be called
324 * after the completion of each use of ide_build_dmatable and before
325 * the next use of ide_build_dmatable. Failure to do so will cause
326 * an oops as only one mapping can be live for each target at a given
327 * time.
328 */
329
330void ide_destroy_dmatable (ide_drive_t *drive)
331{
332 struct pci_dev *dev = HWIF(drive)->pci_dev;
333 struct scatterlist *sg = HWIF(drive)->sg_table;
334 int nents = HWIF(drive)->sg_nents;
335
336 pci_unmap_sg(dev, sg, nents, HWIF(drive)->sg_dma_direction);
337}
338
339EXPORT_SYMBOL_GPL(ide_destroy_dmatable);
340
341/**
342 * config_drive_for_dma - attempt to activate IDE DMA
343 * @drive: the drive to place in DMA mode
344 *
345 * If the drive supports at least mode 2 DMA or UDMA of any kind
346 * then attempt to place it into DMA mode. Drives that are known to
347 * support DMA but predate the DMA properties or that are known
348 * to have DMA handling bugs are also set up appropriately based
349 * on the good/bad drive lists.
350 */
351
352static int config_drive_for_dma (ide_drive_t *drive)
353{
354 struct hd_driveid *id = drive->id;
355 ide_hwif_t *hwif = HWIF(drive);
356
357 if ((id->capability & 1) && hwif->autodma) {
358 /*
359 * Enable DMA on any drive that has
360 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
361 */
362 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
363 return hwif->ide_dma_on(drive);
364 /*
365 * Enable DMA on any drive that has mode2 DMA
366 * (multi or single) enabled
367 */
368 if (id->field_valid & 2) /* regular DMA */
369 if ((id->dma_mword & 0x404) == 0x404 ||
370 (id->dma_1word & 0x404) == 0x404)
371 return hwif->ide_dma_on(drive);
372
373 /* Consult the list of known "good" drives */
374 if (__ide_dma_good_drive(drive))
375 return hwif->ide_dma_on(drive);
376 }
377// if (hwif->tuneproc != NULL) hwif->tuneproc(drive, 255);
378 return hwif->ide_dma_off_quietly(drive);
379}
380
381/**
382 * dma_timer_expiry - handle a DMA timeout
383 * @drive: Drive that timed out
384 *
385 * An IDE DMA transfer timed out. In the event of an error we ask
386 * the driver to resolve the problem, if a DMA transfer is still
387 * in progress we continue to wait (arguably we need to add a
388 * secondary 'I don't care what the drive thinks' timeout here)
389 * Finally if we have an interrupt we let it complete the I/O.
390 * But only one time - we clear expiry and if it's still not
391 * completed after WAIT_CMD, we error and retry in PIO.
392 * This can occur if an interrupt is lost or due to hang or bugs.
393 */
394
395static int dma_timer_expiry (ide_drive_t *drive)
396{
397 ide_hwif_t *hwif = HWIF(drive);
398 u8 dma_stat = hwif->INB(hwif->dma_status);
399
400 printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n",
401 drive->name, dma_stat);
402
403 if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
404 return WAIT_CMD;
405
406 HWGROUP(drive)->expiry = NULL; /* one free ride for now */
407
408 /* 1 dmaing, 2 error, 4 intr */
409 if (dma_stat & 2) /* ERROR */
410 return -1;
411
412 if (dma_stat & 1) /* DMAing */
413 return WAIT_CMD;
414
415 if (dma_stat & 4) /* Got an Interrupt */
416 return WAIT_CMD;
417
418 return 0; /* Status is unknown -- reset the bus */
419}
420
421/**
422 * __ide_dma_host_off - Generic DMA kill
423 * @drive: drive to control
424 *
425 * Perform the generic IDE controller DMA off operation. This
426 * works for most IDE bus mastering controllers
427 */
428
429int __ide_dma_host_off (ide_drive_t *drive)
430{
431 ide_hwif_t *hwif = HWIF(drive);
432 u8 unit = (drive->select.b.unit & 0x01);
433 u8 dma_stat = hwif->INB(hwif->dma_status);
434
435 hwif->OUTB((dma_stat & ~(1<<(5+unit))), hwif->dma_status);
436 return 0;
437}
438
439EXPORT_SYMBOL(__ide_dma_host_off);
440
441/**
442 * __ide_dma_host_off_quietly - Generic DMA kill
443 * @drive: drive to control
444 *
445 * Turn off the current DMA on this IDE controller.
446 */
447
448int __ide_dma_off_quietly (ide_drive_t *drive)
449{
450 drive->using_dma = 0;
451 ide_toggle_bounce(drive, 0);
452
453 if (HWIF(drive)->ide_dma_host_off(drive))
454 return 1;
455
456 return 0;
457}
458
459EXPORT_SYMBOL(__ide_dma_off_quietly);
460#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
461
462/**
463 * __ide_dma_off - disable DMA on a device
464 * @drive: drive to disable DMA on
465 *
466 * Disable IDE DMA for a device on this IDE controller.
467 * Inform the user that DMA has been disabled.
468 */
469
470int __ide_dma_off (ide_drive_t *drive)
471{
472 printk(KERN_INFO "%s: DMA disabled\n", drive->name);
473 return HWIF(drive)->ide_dma_off_quietly(drive);
474}
475
476EXPORT_SYMBOL(__ide_dma_off);
477
478#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
479/**
480 * __ide_dma_host_on - Enable DMA on a host
481 * @drive: drive to enable for DMA
482 *
483 * Enable DMA on an IDE controller following generic bus mastering
484 * IDE controller behaviour
485 */
486
487int __ide_dma_host_on (ide_drive_t *drive)
488{
489 if (drive->using_dma) {
490 ide_hwif_t *hwif = HWIF(drive);
491 u8 unit = (drive->select.b.unit & 0x01);
492 u8 dma_stat = hwif->INB(hwif->dma_status);
493
494 hwif->OUTB((dma_stat|(1<<(5+unit))), hwif->dma_status);
495 return 0;
496 }
497 return 1;
498}
499
500EXPORT_SYMBOL(__ide_dma_host_on);
501
502/**
503 * __ide_dma_on - Enable DMA on a device
504 * @drive: drive to enable DMA on
505 *
506 * Enable IDE DMA for a device on this IDE controller.
507 */
508
509int __ide_dma_on (ide_drive_t *drive)
510{
511 /* consult the list of known "bad" drives */
512 if (__ide_dma_bad_drive(drive))
513 return 1;
514
515 drive->using_dma = 1;
516 ide_toggle_bounce(drive, 1);
517
518 if (HWIF(drive)->ide_dma_host_on(drive))
519 return 1;
520
521 return 0;
522}
523
524EXPORT_SYMBOL(__ide_dma_on);
525
526/**
527 * __ide_dma_check - check DMA setup
528 * @drive: drive to check
529 *
530 * Don't use - due for extermination
531 */
532
533int __ide_dma_check (ide_drive_t *drive)
534{
535 return config_drive_for_dma(drive);
536}
537
538EXPORT_SYMBOL(__ide_dma_check);
539
540/**
541 * ide_dma_setup - begin a DMA phase
542 * @drive: target device
543 *
544 * Build an IDE DMA PRD (IDE speak for scatter gather table)
545 * and then set up the DMA transfer registers for a device
546 * that follows generic IDE PCI DMA behaviour. Controllers can
547 * override this function if they need to
548 *
549 * Returns 0 on success. If a PIO fallback is required then 1
550 * is returned.
551 */
552
553int ide_dma_setup(ide_drive_t *drive)
554{
555 ide_hwif_t *hwif = drive->hwif;
556 struct request *rq = HWGROUP(drive)->rq;
557 unsigned int reading;
558 u8 dma_stat;
559
560 if (rq_data_dir(rq))
561 reading = 0;
562 else
563 reading = 1 << 3;
564
565 /* fall back to pio! */
566 if (!ide_build_dmatable(drive, rq)) {
567 ide_map_sg(drive, rq);
568 return 1;
569 }
570
571 /* PRD table */
572 hwif->OUTL(hwif->dmatable_dma, hwif->dma_prdtable);
573
574 /* specify r/w */
575 hwif->OUTB(reading, hwif->dma_command);
576
577 /* read dma_status for INTR & ERROR flags */
578 dma_stat = hwif->INB(hwif->dma_status);
579
580 /* clear INTR & ERROR flags */
581 hwif->OUTB(dma_stat|6, hwif->dma_status);
582 drive->waiting_for_dma = 1;
583 return 0;
584}
585
586EXPORT_SYMBOL_GPL(ide_dma_setup);
587
588static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
589{
590 /* issue cmd to drive */
591 ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
592}
593
594void ide_dma_start(ide_drive_t *drive)
595{
596 ide_hwif_t *hwif = HWIF(drive);
597 u8 dma_cmd = hwif->INB(hwif->dma_command);
598
599 /* Note that this is done *after* the cmd has
600 * been issued to the drive, as per the BM-IDE spec.
601 * The Promise Ultra33 doesn't work correctly when
602 * we do this part before issuing the drive cmd.
603 */
604 /* start DMA */
605 hwif->OUTB(dma_cmd|1, hwif->dma_command);
606 hwif->dma = 1;
607 wmb();
608}
609
610EXPORT_SYMBOL_GPL(ide_dma_start);
611
612/* returns 1 on error, 0 otherwise */
613int __ide_dma_end (ide_drive_t *drive)
614{
615 ide_hwif_t *hwif = HWIF(drive);
616 u8 dma_stat = 0, dma_cmd = 0;
617
618 drive->waiting_for_dma = 0;
619 /* get dma_command mode */
620 dma_cmd = hwif->INB(hwif->dma_command);
621 /* stop DMA */
622 hwif->OUTB(dma_cmd&~1, hwif->dma_command);
623 /* get DMA status */
624 dma_stat = hwif->INB(hwif->dma_status);
625 /* clear the INTR & ERROR bits */
626 hwif->OUTB(dma_stat|6, hwif->dma_status);
627 /* purge DMA mappings */
628 ide_destroy_dmatable(drive);
629 /* verify good DMA status */
630 hwif->dma = 0;
631 wmb();
632 return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
633}
634
635EXPORT_SYMBOL(__ide_dma_end);
636
637/* returns 1 if dma irq issued, 0 otherwise */
638static int __ide_dma_test_irq(ide_drive_t *drive)
639{
640 ide_hwif_t *hwif = HWIF(drive);
641 u8 dma_stat = hwif->INB(hwif->dma_status);
642
643#if 0 /* do not set unless you know what you are doing */
644 if (dma_stat & 4) {
645 u8 stat = hwif->INB(IDE_STATUS_REG);
646 hwif->OUTB(hwif->dma_status, dma_stat & 0xE4);
647 }
648#endif
649 /* return 1 if INTR asserted */
650 if ((dma_stat & 4) == 4)
651 return 1;
652 if (!drive->waiting_for_dma)
653 printk(KERN_WARNING "%s: (%s) called while not waiting\n",
654 drive->name, __FUNCTION__);
655 return 0;
656}
657#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
658
659int __ide_dma_bad_drive (ide_drive_t *drive)
660{
661 struct hd_driveid *id = drive->id;
662
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100663 int blacklist = ide_in_drive_list(id, drive_blacklist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 if (blacklist) {
665 printk(KERN_WARNING "%s: Disabling (U)DMA for %s (blacklisted)\n",
666 drive->name, id->model);
667 return blacklist;
668 }
669 return 0;
670}
671
672EXPORT_SYMBOL(__ide_dma_bad_drive);
673
674int __ide_dma_good_drive (ide_drive_t *drive)
675{
676 struct hd_driveid *id = drive->id;
Jordan Crouse65e5f2e2005-12-15 02:16:18 +0100677 return ide_in_drive_list(id, drive_whitelist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678}
679
680EXPORT_SYMBOL(__ide_dma_good_drive);
681
682int ide_use_dma(ide_drive_t *drive)
683{
684 struct hd_driveid *id = drive->id;
685 ide_hwif_t *hwif = drive->hwif;
686
687 /* consult the list of known "bad" drives */
688 if (__ide_dma_bad_drive(drive))
689 return 0;
690
691 /* capable of UltraDMA modes */
692 if (id->field_valid & 4) {
693 if (hwif->ultra_mask & id->dma_ultra)
694 return 1;
695 }
696
697 /* capable of regular DMA modes */
698 if (id->field_valid & 2) {
699 if (hwif->mwdma_mask & id->dma_mword)
700 return 1;
701 if (hwif->swdma_mask & id->dma_1word)
702 return 1;
703 }
704
705 /* consult the list of known "good" drives */
706 if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150)
707 return 1;
708
709 return 0;
710}
711
712EXPORT_SYMBOL_GPL(ide_use_dma);
713
714void ide_dma_verbose(ide_drive_t *drive)
715{
716 struct hd_driveid *id = drive->id;
717 ide_hwif_t *hwif = HWIF(drive);
718
719 if (id->field_valid & 4) {
720 if ((id->dma_ultra >> 8) && (id->dma_mword >> 8))
721 goto bug_dma_off;
722 if (id->dma_ultra & ((id->dma_ultra >> 8) & hwif->ultra_mask)) {
723 if (((id->dma_ultra >> 11) & 0x1F) &&
724 eighty_ninty_three(drive)) {
725 if ((id->dma_ultra >> 15) & 1) {
726 printk(", UDMA(mode 7)");
727 } else if ((id->dma_ultra >> 14) & 1) {
728 printk(", UDMA(133)");
729 } else if ((id->dma_ultra >> 13) & 1) {
730 printk(", UDMA(100)");
731 } else if ((id->dma_ultra >> 12) & 1) {
732 printk(", UDMA(66)");
733 } else if ((id->dma_ultra >> 11) & 1) {
734 printk(", UDMA(44)");
735 } else
736 goto mode_two;
737 } else {
738 mode_two:
739 if ((id->dma_ultra >> 10) & 1) {
740 printk(", UDMA(33)");
741 } else if ((id->dma_ultra >> 9) & 1) {
742 printk(", UDMA(25)");
743 } else if ((id->dma_ultra >> 8) & 1) {
744 printk(", UDMA(16)");
745 }
746 }
747 } else {
748 printk(", (U)DMA"); /* Can be BIOS-enabled! */
749 }
750 } else if (id->field_valid & 2) {
751 if ((id->dma_mword >> 8) && (id->dma_1word >> 8))
752 goto bug_dma_off;
753 printk(", DMA");
754 } else if (id->field_valid & 1) {
755 printk(", BUG");
756 }
757 return;
758bug_dma_off:
759 printk(", BUG DMA OFF");
760 hwif->ide_dma_off_quietly(drive);
761 return;
762}
763
764EXPORT_SYMBOL(ide_dma_verbose);
765
766#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
767int __ide_dma_lostirq (ide_drive_t *drive)
768{
769 printk("%s: DMA interrupt recovery\n", drive->name);
770 return 1;
771}
772
773EXPORT_SYMBOL(__ide_dma_lostirq);
774
775int __ide_dma_timeout (ide_drive_t *drive)
776{
777 printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
778 if (HWIF(drive)->ide_dma_test_irq(drive))
779 return 0;
780
781 return HWIF(drive)->ide_dma_end(drive);
782}
783
784EXPORT_SYMBOL(__ide_dma_timeout);
785
786/*
787 * Needed for allowing full modular support of ide-driver
788 */
789static int ide_release_dma_engine(ide_hwif_t *hwif)
790{
791 if (hwif->dmatable_cpu) {
792 pci_free_consistent(hwif->pci_dev,
793 PRD_ENTRIES * PRD_BYTES,
794 hwif->dmatable_cpu,
795 hwif->dmatable_dma);
796 hwif->dmatable_cpu = NULL;
797 }
798 return 1;
799}
800
801static int ide_release_iomio_dma(ide_hwif_t *hwif)
802{
803 if ((hwif->dma_extra) && (hwif->channel == 0))
804 release_region((hwif->dma_base + 16), hwif->dma_extra);
805 release_region(hwif->dma_base, 8);
806 if (hwif->dma_base2)
807 release_region(hwif->dma_base, 8);
808 return 1;
809}
810
811/*
812 * Needed for allowing full modular support of ide-driver
813 */
814int ide_release_dma (ide_hwif_t *hwif)
815{
816 if (hwif->mmio == 2)
817 return 1;
818 if (hwif->chipset == ide_etrax100)
819 return 1;
820
821 ide_release_dma_engine(hwif);
822 return ide_release_iomio_dma(hwif);
823}
824
825static int ide_allocate_dma_engine(ide_hwif_t *hwif)
826{
827 hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
828 PRD_ENTRIES * PRD_BYTES,
829 &hwif->dmatable_dma);
830
831 if (hwif->dmatable_cpu)
832 return 0;
833
834 printk(KERN_ERR "%s: -- Error, unable to allocate%s DMA table(s).\n",
835 hwif->cds->name, !hwif->dmatable_cpu ? " CPU" : "");
836
837 ide_release_dma_engine(hwif);
838 return 1;
839}
840
841static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
842{
843 printk(KERN_INFO " %s: MMIO-DMA ", hwif->name);
844
845 hwif->dma_base = base;
846 if (hwif->cds->extra && hwif->channel == 0)
847 hwif->dma_extra = hwif->cds->extra;
848
849 if(hwif->mate)
850 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
851 else
852 hwif->dma_master = base;
853 return 0;
854}
855
856static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
857{
858 printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
859 hwif->name, base, base + ports - 1);
860 if (!request_region(base, ports, hwif->name)) {
861 printk(" -- Error, ports in use.\n");
862 return 1;
863 }
864 hwif->dma_base = base;
865 if ((hwif->cds->extra) && (hwif->channel == 0)) {
866 request_region(base+16, hwif->cds->extra, hwif->cds->name);
867 hwif->dma_extra = hwif->cds->extra;
868 }
869
870 if(hwif->mate)
871 hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
872 else
873 hwif->dma_master = base;
874 if (hwif->dma_base2) {
875 if (!request_region(hwif->dma_base2, ports, hwif->name))
876 {
877 printk(" -- Error, secondary ports in use.\n");
878 release_region(base, ports);
879 return 1;
880 }
881 }
882 return 0;
883}
884
885static int ide_dma_iobase(ide_hwif_t *hwif, unsigned long base, unsigned int ports)
886{
887 if (hwif->mmio == 2)
888 return ide_mapped_mmio_dma(hwif, base,ports);
889 BUG_ON(hwif->mmio == 1);
890 return ide_iomio_dma(hwif, base, ports);
891}
892
893/*
894 * This can be called for a dynamically installed interface. Don't __init it
895 */
896void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_ports)
897{
898 if (ide_dma_iobase(hwif, dma_base, num_ports))
899 return;
900
901 if (ide_allocate_dma_engine(hwif)) {
902 ide_release_dma(hwif);
903 return;
904 }
905
906 if (!(hwif->dma_command))
907 hwif->dma_command = hwif->dma_base;
908 if (!(hwif->dma_vendor1))
909 hwif->dma_vendor1 = (hwif->dma_base + 1);
910 if (!(hwif->dma_status))
911 hwif->dma_status = (hwif->dma_base + 2);
912 if (!(hwif->dma_vendor3))
913 hwif->dma_vendor3 = (hwif->dma_base + 3);
914 if (!(hwif->dma_prdtable))
915 hwif->dma_prdtable = (hwif->dma_base + 4);
916
917 if (!hwif->ide_dma_off_quietly)
918 hwif->ide_dma_off_quietly = &__ide_dma_off_quietly;
919 if (!hwif->ide_dma_host_off)
920 hwif->ide_dma_host_off = &__ide_dma_host_off;
921 if (!hwif->ide_dma_on)
922 hwif->ide_dma_on = &__ide_dma_on;
923 if (!hwif->ide_dma_host_on)
924 hwif->ide_dma_host_on = &__ide_dma_host_on;
925 if (!hwif->ide_dma_check)
926 hwif->ide_dma_check = &__ide_dma_check;
927 if (!hwif->dma_setup)
928 hwif->dma_setup = &ide_dma_setup;
929 if (!hwif->dma_exec_cmd)
930 hwif->dma_exec_cmd = &ide_dma_exec_cmd;
931 if (!hwif->dma_start)
932 hwif->dma_start = &ide_dma_start;
933 if (!hwif->ide_dma_end)
934 hwif->ide_dma_end = &__ide_dma_end;
935 if (!hwif->ide_dma_test_irq)
936 hwif->ide_dma_test_irq = &__ide_dma_test_irq;
937 if (!hwif->ide_dma_timeout)
938 hwif->ide_dma_timeout = &__ide_dma_timeout;
939 if (!hwif->ide_dma_lostirq)
940 hwif->ide_dma_lostirq = &__ide_dma_lostirq;
941
942 if (hwif->chipset != ide_trm290) {
943 u8 dma_stat = hwif->INB(hwif->dma_status);
944 printk(", BIOS settings: %s:%s, %s:%s",
945 hwif->drives[0].name, (dma_stat & 0x20) ? "DMA" : "pio",
946 hwif->drives[1].name, (dma_stat & 0x40) ? "DMA" : "pio");
947 }
948 printk("\n");
949
950 if (!(hwif->dma_master))
951 BUG();
952}
953
954EXPORT_SYMBOL_GPL(ide_setup_dma);
955#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */