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[PATCH] radix-tree documentation cleanups
[linux-2.6/mini2440.git] / drivers / ide / ide-taskfile.c
blob0606bd2f6020fe7c3a3fc2485cf05e7893880fc1
1 /*
2 * linux/drivers/ide/ide-taskfile.c Version 0.38 March 05, 2003
3 *
4 * Copyright (C) 2000-2002 Michael Cornwell <cornwell@acm.org>
5 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
6 * Copyright (C) 2001-2002 Klaus Smolin
7 * IBM Storage Technology Division
8 * Copyright (C) 2003-2004 Bartlomiej Zolnierkiewicz
9 *
10 * The big the bad and the ugly.
11 *
12 * Problems to be fixed because of BH interface or the lack therefore.
13 *
14 * Fill me in stupid !!!
15 *
16 * HOST:
17 * General refers to the Controller and Driver "pair".
18 * DATA HANDLER:
19 * Under the context of Linux it generally refers to an interrupt handler.
20 * However, it correctly describes the 'HOST'
21 * DATA BLOCK:
22 * The amount of data needed to be transfered as predefined in the
23 * setup of the device.
24 * STORAGE ATOMIC:
25 * The 'DATA BLOCK' associated to the 'DATA HANDLER', and can be as
26 * small as a single sector or as large as the entire command block
27 * request.
28 */
29
30 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/timer.h>
36 #include <linux/mm.h>
37 #include <linux/sched.h>
38 #include <linux/interrupt.h>
39 #include <linux/major.h>
40 #include <linux/errno.h>
41 #include <linux/genhd.h>
42 #include <linux/blkpg.h>
43 #include <linux/slab.h>
44 #include <linux/pci.h>
45 #include <linux/delay.h>
46 #include <linux/hdreg.h>
47 #include <linux/ide.h>
48 #include <linux/bitops.h>
49
50 #include <asm/byteorder.h>
51 #include <asm/irq.h>
52 #include <asm/uaccess.h>
53 #include <asm/io.h>
54
55 static void ata_bswap_data (void *buffer, int wcount)
56 {
57 u16 *p = buffer;
58
59 while (wcount--) {
60 *p = *p << 8 | *p >> 8; p++;
61 *p = *p << 8 | *p >> 8; p++;
62 }
63 }
64
65 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
66 {
67 HWIF(drive)->ata_input_data(drive, buffer, wcount);
68 if (drive->bswap)
69 ata_bswap_data(buffer, wcount);
70 }
71
72 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
73 {
74 if (drive->bswap) {
75 ata_bswap_data(buffer, wcount);
76 HWIF(drive)->ata_output_data(drive, buffer, wcount);
77 ata_bswap_data(buffer, wcount);
78 } else {
79 HWIF(drive)->ata_output_data(drive, buffer, wcount);
80 }
81 }
82
83 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
84 {
85 ide_task_t args;
86 memset(&args, 0, sizeof(ide_task_t));
87 args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
88 if (drive->media == ide_disk)
89 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_IDENTIFY;
90 else
91 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_PIDENTIFY;
92 args.command_type = IDE_DRIVE_TASK_IN;
93 args.data_phase = TASKFILE_IN;
94 args.handler = &task_in_intr;
95 return ide_raw_taskfile(drive, &args, buf);
96 }
97
98 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
99 {
100 ide_hwif_t *hwif = HWIF(drive);
101 task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
102 hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
103 u8 HIHI = (drive->addressing == 1) ? 0xE0 : 0xEF;
104
105 /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
106 if (IDE_CONTROL_REG) {
107 /* clear nIEN */
108 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
109 }
110 SELECT_MASK(drive, 0);
111
112 if (drive->addressing == 1) {
113 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
114 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
115 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
116 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
117 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
118 }
119
120 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
121 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
122 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
123 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
124 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
125
126 hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
127
128 if (task->handler != NULL) {
129 if (task->prehandler != NULL) {
130 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
131 ndelay(400); /* FIXME */
132 return task->prehandler(drive, task->rq);
133 }
134 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
135 return ide_started;
136 }
137
138 if (!drive->using_dma)
139 return ide_stopped;
140
141 switch (taskfile->command) {
142 case WIN_WRITEDMA_ONCE:
143 case WIN_WRITEDMA:
144 case WIN_WRITEDMA_EXT:
145 case WIN_READDMA_ONCE:
146 case WIN_READDMA:
147 case WIN_READDMA_EXT:
148 case WIN_IDENTIFY_DMA:
149 if (!hwif->dma_setup(drive)) {
150 hwif->dma_exec_cmd(drive, taskfile->command);
151 hwif->dma_start(drive);
152 return ide_started;
153 }
154 break;
155 default:
156 if (task->handler == NULL)
157 return ide_stopped;
158 }
159
160 return ide_stopped;
161 }
162
163 /*
164 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
165 */
166 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
167 {
168 ide_hwif_t *hwif = HWIF(drive);
169 u8 stat;
170
171 if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
172 drive->mult_count = drive->mult_req;
173 } else {
174 drive->mult_req = drive->mult_count = 0;
175 drive->special.b.recalibrate = 1;
176 (void) ide_dump_status(drive, "set_multmode", stat);
177 }
178 return ide_stopped;
179 }
180
181 /*
182 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
183 */
184 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
185 {
186 ide_hwif_t *hwif = HWIF(drive);
187 int retries = 5;
188 u8 stat;
189
190 while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
191 udelay(10);
192
193 if (OK_STAT(stat, READY_STAT, BAD_STAT))
194 return ide_stopped;
195
196 if (stat & (ERR_STAT|DRQ_STAT))
197 return ide_error(drive, "set_geometry_intr", stat);
198
199 if (HWGROUP(drive)->handler != NULL)
200 BUG();
201 ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
202 return ide_started;
203 }
204
205 /*
206 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
207 */
208 ide_startstop_t recal_intr (ide_drive_t *drive)
209 {
210 ide_hwif_t *hwif = HWIF(drive);
211 u8 stat;
212
213 if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
214 return ide_error(drive, "recal_intr", stat);
215 return ide_stopped;
216 }
217
218 /*
219 * Handler for commands without a data phase
220 */
221 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
222 {
223 ide_task_t *args = HWGROUP(drive)->rq->special;
224 ide_hwif_t *hwif = HWIF(drive);
225 u8 stat;
226
227 local_irq_enable();
228 if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
229 return ide_error(drive, "task_no_data_intr", stat);
230 /* calls ide_end_drive_cmd */
231 }
232 if (args)
233 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
234
235 return ide_stopped;
236 }
237
238 EXPORT_SYMBOL(task_no_data_intr);
239
240 static u8 wait_drive_not_busy(ide_drive_t *drive)
241 {
242 ide_hwif_t *hwif = HWIF(drive);
243 int retries = 100;
244 u8 stat;
245
246 /*
247 * Last sector was transfered, wait until drive is ready.
248 * This can take up to 10 usec, but we will wait max 1 ms
249 * (drive_cmd_intr() waits that long).
250 */
251 while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
252 udelay(10);
253
254 if (!retries)
255 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
256
257 return stat;
258 }
259
260 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
261 {
262 ide_hwif_t *hwif = drive->hwif;
263 struct scatterlist *sg = hwif->sg_table;
264 struct page *page;
265 #ifdef CONFIG_HIGHMEM
266 unsigned long flags;
267 #endif
268 unsigned int offset;
269 u8 *buf;
270
271 page = sg[hwif->cursg].page;
272 offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
273
274 /* get the current page and offset */
275 page = nth_page(page, (offset >> PAGE_SHIFT));
276 offset %= PAGE_SIZE;
277
278 #ifdef CONFIG_HIGHMEM
279 local_irq_save(flags);
280 #endif
281 buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
282
283 hwif->nleft--;
284 hwif->cursg_ofs++;
285
286 if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
287 hwif->cursg++;
288 hwif->cursg_ofs = 0;
289 }
290
291 /* do the actual data transfer */
292 if (write)
293 taskfile_output_data(drive, buf, SECTOR_WORDS);
294 else
295 taskfile_input_data(drive, buf, SECTOR_WORDS);
296
297 kunmap_atomic(buf, KM_BIO_SRC_IRQ);
298 #ifdef CONFIG_HIGHMEM
299 local_irq_restore(flags);
300 #endif
301 }
302
303 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
304 {
305 unsigned int nsect;
306
307 nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
308 while (nsect--)
309 ide_pio_sector(drive, write);
310 }
311
312 static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
313 unsigned int write)
314 {
315 if (rq->bio) /* fs request */
316 rq->errors = 0;
317
318 touch_softlockup_watchdog();
319
320 switch (drive->hwif->data_phase) {
321 case TASKFILE_MULTI_IN:
322 case TASKFILE_MULTI_OUT:
323 ide_pio_multi(drive, write);
324 break;
325 default:
326 ide_pio_sector(drive, write);
327 break;
328 }
329 }
330
331 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
332 const char *s, u8 stat)
333 {
334 if (rq->bio) {
335 ide_hwif_t *hwif = drive->hwif;
336 int sectors = hwif->nsect - hwif->nleft;
337
338 switch (hwif->data_phase) {
339 case TASKFILE_IN:
340 if (hwif->nleft)
341 break;
342 /* fall through */
343 case TASKFILE_OUT:
344 sectors--;
345 break;
346 case TASKFILE_MULTI_IN:
347 if (hwif->nleft)
348 break;
349 /* fall through */
350 case TASKFILE_MULTI_OUT:
351 sectors -= drive->mult_count;
352 default:
353 break;
354 }
355
356 if (sectors > 0) {
357 ide_driver_t *drv;
358
359 drv = *(ide_driver_t **)rq->rq_disk->private_data;
360 drv->end_request(drive, 1, sectors);
361 }
362 }
363 return ide_error(drive, s, stat);
364 }
365
366 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
367 {
368 if (rq->flags & REQ_DRIVE_TASKFILE) {
369 ide_task_t *task = rq->special;
370
371 if (task->tf_out_flags.all) {
372 u8 err = drive->hwif->INB(IDE_ERROR_REG);
373 ide_end_drive_cmd(drive, stat, err);
374 return;
375 }
376 }
377
378 ide_end_request(drive, 1, rq->hard_nr_sectors);
379 }
380
381 /*
382 * Handler for command with PIO data-in phase (Read/Read Multiple).
383 */
384 ide_startstop_t task_in_intr (ide_drive_t *drive)
385 {
386 ide_hwif_t *hwif = drive->hwif;
387 struct request *rq = HWGROUP(drive)->rq;
388 u8 stat = hwif->INB(IDE_STATUS_REG);
389
390 /* new way for dealing with premature shared PCI interrupts */
391 if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
392 if (stat & (ERR_STAT | DRQ_STAT))
393 return task_error(drive, rq, __FUNCTION__, stat);
394 /* No data yet, so wait for another IRQ. */
395 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
396 return ide_started;
397 }
398
399 ide_pio_datablock(drive, rq, 0);
400
401 /* If it was the last datablock check status and finish transfer. */
402 if (!hwif->nleft) {
403 stat = wait_drive_not_busy(drive);
404 if (!OK_STAT(stat, 0, BAD_R_STAT))
405 return task_error(drive, rq, __FUNCTION__, stat);
406 task_end_request(drive, rq, stat);
407 return ide_stopped;
408 }
409
410 /* Still data left to transfer. */
411 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
412
413 return ide_started;
414 }
415 EXPORT_SYMBOL(task_in_intr);
416
417 /*
418 * Handler for command with PIO data-out phase (Write/Write Multiple).
419 */
420 static ide_startstop_t task_out_intr (ide_drive_t *drive)
421 {
422 ide_hwif_t *hwif = drive->hwif;
423 struct request *rq = HWGROUP(drive)->rq;
424 u8 stat = hwif->INB(IDE_STATUS_REG);
425
426 if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
427 return task_error(drive, rq, __FUNCTION__, stat);
428
429 /* Deal with unexpected ATA data phase. */
430 if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
431 return task_error(drive, rq, __FUNCTION__, stat);
432
433 if (!hwif->nleft) {
434 task_end_request(drive, rq, stat);
435 return ide_stopped;
436 }
437
438 /* Still data left to transfer. */
439 ide_pio_datablock(drive, rq, 1);
440 ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
441
442 return ide_started;
443 }
444
445 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
446 {
447 ide_startstop_t startstop;
448
449 if (ide_wait_stat(&startstop, drive, DATA_READY,
450 drive->bad_wstat, WAIT_DRQ)) {
451 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
452 drive->name,
453 drive->hwif->data_phase ? "MULT" : "",
454 drive->addressing ? "_EXT" : "");
455 return startstop;
456 }
457
458 if (!drive->unmask)
459 local_irq_disable();
460
461 ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
462 ide_pio_datablock(drive, rq, 1);
463
464 return ide_started;
465 }
466 EXPORT_SYMBOL(pre_task_out_intr);
467
468 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
469 {
470 struct request rq;
471
472 memset(&rq, 0, sizeof(rq));
473 rq.flags = REQ_DRIVE_TASKFILE;
474 rq.buffer = buf;
475
476 /*
477 * (ks) We transfer currently only whole sectors.
478 * This is suffient for now. But, it would be great,
479 * if we would find a solution to transfer any size.
480 * To support special commands like READ LONG.
481 */
482 if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
483 if (data_size == 0)
484 rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
485 else
486 rq.nr_sectors = data_size / SECTOR_SIZE;
487
488 if (!rq.nr_sectors) {
489 printk(KERN_ERR "%s: in/out command without data\n",
490 drive->name);
491 return -EFAULT;
492 }
493
494 rq.hard_nr_sectors = rq.nr_sectors;
495 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
496
497 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
498 rq.flags |= REQ_RW;
499 }
500
501 rq.special = args;
502 args->rq = &rq;
503 return ide_do_drive_cmd(drive, &rq, ide_wait);
504 }
505
506 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
507 {
508 return ide_diag_taskfile(drive, args, 0, buf);
509 }
510
511 EXPORT_SYMBOL(ide_raw_taskfile);
512
513 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
514 {
515 ide_task_request_t *req_task;
516 ide_task_t args;
517 u8 *outbuf = NULL;
518 u8 *inbuf = NULL;
519 task_ioreg_t *argsptr = args.tfRegister;
520 task_ioreg_t *hobsptr = args.hobRegister;
521 int err = 0;
522 int tasksize = sizeof(struct ide_task_request_s);
523 int taskin = 0;
524 int taskout = 0;
525 u8 io_32bit = drive->io_32bit;
526 char __user *buf = (char __user *)arg;
527
528 // printk("IDE Taskfile ...\n");
529
530 req_task = kzalloc(tasksize, GFP_KERNEL);
531 if (req_task == NULL) return -ENOMEM;
532 if (copy_from_user(req_task, buf, tasksize)) {
533 kfree(req_task);
534 return -EFAULT;
535 }
536
537 taskout = (int) req_task->out_size;
538 taskin = (int) req_task->in_size;
539
540 if (taskout) {
541 int outtotal = tasksize;
542 outbuf = kzalloc(taskout, GFP_KERNEL);
543 if (outbuf == NULL) {
544 err = -ENOMEM;
545 goto abort;
546 }
547 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
548 err = -EFAULT;
549 goto abort;
550 }
551 }
552
553 if (taskin) {
554 int intotal = tasksize + taskout;
555 inbuf = kzalloc(taskin, GFP_KERNEL);
556 if (inbuf == NULL) {
557 err = -ENOMEM;
558 goto abort;
559 }
560 if (copy_from_user(inbuf, buf + intotal, taskin)) {
561 err = -EFAULT;
562 goto abort;
563 }
564 }
565
566 memset(&args, 0, sizeof(ide_task_t));
567 memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
568 memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
569
570 args.tf_in_flags = req_task->in_flags;
571 args.tf_out_flags = req_task->out_flags;
572 args.data_phase = req_task->data_phase;
573 args.command_type = req_task->req_cmd;
574
575 drive->io_32bit = 0;
576 switch(req_task->data_phase) {
577 case TASKFILE_OUT_DMAQ:
578 case TASKFILE_OUT_DMA:
579 err = ide_diag_taskfile(drive, &args, taskout, outbuf);
580 break;
581 case TASKFILE_IN_DMAQ:
582 case TASKFILE_IN_DMA:
583 err = ide_diag_taskfile(drive, &args, taskin, inbuf);
584 break;
585 case TASKFILE_MULTI_OUT:
586 if (!drive->mult_count) {
587 /* (hs): give up if multcount is not set */
588 printk(KERN_ERR "%s: %s Multimode Write " \
589 "multcount is not set\n",
590 drive->name, __FUNCTION__);
591 err = -EPERM;
592 goto abort;
593 }
594 /* fall through */
595 case TASKFILE_OUT:
596 args.prehandler = &pre_task_out_intr;
597 args.handler = &task_out_intr;
598 err = ide_diag_taskfile(drive, &args, taskout, outbuf);
599 break;
600 case TASKFILE_MULTI_IN:
601 if (!drive->mult_count) {
602 /* (hs): give up if multcount is not set */
603 printk(KERN_ERR "%s: %s Multimode Read failure " \
604 "multcount is not set\n",
605 drive->name, __FUNCTION__);
606 err = -EPERM;
607 goto abort;
608 }
609 /* fall through */
610 case TASKFILE_IN:
611 args.handler = &task_in_intr;
612 err = ide_diag_taskfile(drive, &args, taskin, inbuf);
613 break;
614 case TASKFILE_NO_DATA:
615 args.handler = &task_no_data_intr;
616 err = ide_diag_taskfile(drive, &args, 0, NULL);
617 break;
618 default:
619 err = -EFAULT;
620 goto abort;
621 }
622
623 memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
624 memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
625 req_task->in_flags = args.tf_in_flags;
626 req_task->out_flags = args.tf_out_flags;
627
628 if (copy_to_user(buf, req_task, tasksize)) {
629 err = -EFAULT;
630 goto abort;
631 }
632 if (taskout) {
633 int outtotal = tasksize;
634 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
635 err = -EFAULT;
636 goto abort;
637 }
638 }
639 if (taskin) {
640 int intotal = tasksize + taskout;
641 if (copy_to_user(buf + intotal, inbuf, taskin)) {
642 err = -EFAULT;
643 goto abort;
644 }
645 }
646 abort:
647 kfree(req_task);
648 kfree(outbuf);
649 kfree(inbuf);
650
651 // printk("IDE Taskfile ioctl ended. rc = %i\n", err);
652
653 drive->io_32bit = io_32bit;
654
655 return err;
656 }
657
658 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
659 {
660 struct request rq;
661 u8 buffer[4];
662
663 if (!buf)
664 buf = buffer;
665 memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
666 ide_init_drive_cmd(&rq);
667 rq.buffer = buf;
668 *buf++ = cmd;
669 *buf++ = nsect;
670 *buf++ = feature;
671 *buf++ = sectors;
672 return ide_do_drive_cmd(drive, &rq, ide_wait);
673 }
674
675 /*
676 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
677 */
678 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
679 {
680 int err = 0;
681 u8 args[4], *argbuf = args;
682 u8 xfer_rate = 0;
683 int argsize = 4;
684 ide_task_t tfargs;
685
686 if (NULL == (void *) arg) {
687 struct request rq;
688 ide_init_drive_cmd(&rq);
689 return ide_do_drive_cmd(drive, &rq, ide_wait);
690 }
691
692 if (copy_from_user(args, (void __user *)arg, 4))
693 return -EFAULT;
694
695 memset(&tfargs, 0, sizeof(ide_task_t));
696 tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
697 tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
698 tfargs.tfRegister[IDE_SECTOR_OFFSET] = args[1];
699 tfargs.tfRegister[IDE_LCYL_OFFSET] = 0x00;
700 tfargs.tfRegister[IDE_HCYL_OFFSET] = 0x00;
701 tfargs.tfRegister[IDE_SELECT_OFFSET] = 0x00;
702 tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
703
704 if (args[3]) {
705 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
706 argbuf = kzalloc(argsize, GFP_KERNEL);
707 if (argbuf == NULL)
708 return -ENOMEM;
709 }
710 if (set_transfer(drive, &tfargs)) {
711 xfer_rate = args[1];
712 if (ide_ata66_check(drive, &tfargs))
713 goto abort;
714 }
715
716 err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
717
718 if (!err && xfer_rate) {
719 /* active-retuning-calls future */
720 ide_set_xfer_rate(drive, xfer_rate);
721 ide_driveid_update(drive);
722 }
723 abort:
724 if (copy_to_user((void __user *)arg, argbuf, argsize))
725 err = -EFAULT;
726 if (argsize > 4)
727 kfree(argbuf);
728 return err;
729 }
730
731 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
732 {
733 struct request rq;
734
735 ide_init_drive_cmd(&rq);
736 rq.flags = REQ_DRIVE_TASK;
737 rq.buffer = buf;
738 return ide_do_drive_cmd(drive, &rq, ide_wait);
739 }
740
741 /*
742 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
743 */
744 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
745 {
746 void __user *p = (void __user *)arg;
747 int err = 0;
748 u8 args[7], *argbuf = args;
749 int argsize = 7;
750
751 if (copy_from_user(args, p, 7))
752 return -EFAULT;
753 err = ide_wait_cmd_task(drive, argbuf);
754 if (copy_to_user(p, argbuf, argsize))
755 err = -EFAULT;
756 return err;
757 }
758
759 /*
760 * NOTICE: This is additions from IBM to provide a discrete interface,
761 * for selective taskregister access operations. Nice JOB Klaus!!!
762 * Glad to be able to work and co-develop this with you and IBM.
763 */
764 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
765 {
766 ide_hwif_t *hwif = HWIF(drive);
767 task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
768 hob_struct_t *hobfile = (hob_struct_t *) task->hobRegister;
769
770 if (task->data_phase == TASKFILE_MULTI_IN ||
771 task->data_phase == TASKFILE_MULTI_OUT) {
772 if (!drive->mult_count) {
773 printk(KERN_ERR "%s: multimode not set!\n", drive->name);
774 return ide_stopped;
775 }
776 }
777
778 /*
779 * (ks) Check taskfile in flags.
780 * If set, then execute as it is defined.
781 * If not set, then define default settings.
782 * The default values are:
783 * read all taskfile registers (except data)
784 * read the hob registers (sector, nsector, lcyl, hcyl)
785 */
786 if (task->tf_in_flags.all == 0) {
787 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
788 if (drive->addressing == 1)
789 task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS << 8);
790 }
791
792 /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
793 if (IDE_CONTROL_REG)
794 /* clear nIEN */
795 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
796 SELECT_MASK(drive, 0);
797
798 if (task->tf_out_flags.b.data) {
799 u16 data = taskfile->data + (hobfile->data << 8);
800 hwif->OUTW(data, IDE_DATA_REG);
801 }
802
803 /* (ks) send hob registers first */
804 if (task->tf_out_flags.b.nsector_hob)
805 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
806 if (task->tf_out_flags.b.sector_hob)
807 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
808 if (task->tf_out_flags.b.lcyl_hob)
809 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
810 if (task->tf_out_flags.b.hcyl_hob)
811 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
812
813 /* (ks) Send now the standard registers */
814 if (task->tf_out_flags.b.error_feature)
815 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
816 /* refers to number of sectors to transfer */
817 if (task->tf_out_flags.b.nsector)
818 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
819 /* refers to sector offset or start sector */
820 if (task->tf_out_flags.b.sector)
821 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
822 if (task->tf_out_flags.b.lcyl)
823 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
824 if (task->tf_out_flags.b.hcyl)
825 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
826
827 /*
828 * (ks) In the flagged taskfile approch, we will use all specified
829 * registers and the register value will not be changed, except the
830 * select bit (master/slave) in the drive_head register. We must make
831 * sure that the desired drive is selected.
832 */
833 hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
834 switch(task->data_phase) {
835
836 case TASKFILE_OUT_DMAQ:
837 case TASKFILE_OUT_DMA:
838 case TASKFILE_IN_DMAQ:
839 case TASKFILE_IN_DMA:
840 hwif->dma_setup(drive);
841 hwif->dma_exec_cmd(drive, taskfile->command);
842 hwif->dma_start(drive);
843 break;
844
845 default:
846 if (task->handler == NULL)
847 return ide_stopped;
848
849 /* Issue the command */
850 if (task->prehandler) {
851 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
852 ndelay(400); /* FIXME */
853 return task->prehandler(drive, task->rq);
854 }
855 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
856 }
857
858 return ide_started;
859 }
Support for the Chinese Samsung S3C2440 based development boards