Linux-2.6.12-rc2
[linux-2.6.git] / drivers / ide / ide-taskfile.c
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/interrupt.h>
38 #include <linux/major.h>
39 #include <linux/errno.h>
40 #include <linux/genhd.h>
41 #include <linux/blkpg.h>
42 #include <linux/slab.h>
43 #include <linux/pci.h>
44 #include <linux/delay.h>
45 #include <linux/hdreg.h>
46 #include <linux/ide.h>
47 #include <linux/bitops.h>
48
49 #include <asm/byteorder.h>
50 #include <asm/irq.h>
51 #include <asm/uaccess.h>
52 #include <asm/io.h>
53
54 #define DEBUG_TASKFILE  0       /* unset when fixed */
55
56 static void ata_bswap_data (void *buffer, int wcount)
57 {
58         u16 *p = buffer;
59
60         while (wcount--) {
61                 *p = *p << 8 | *p >> 8; p++;
62                 *p = *p << 8 | *p >> 8; p++;
63         }
64 }
65
66 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
67 {
68         HWIF(drive)->ata_input_data(drive, buffer, wcount);
69         if (drive->bswap)
70                 ata_bswap_data(buffer, wcount);
71 }
72
73 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
74 {
75         if (drive->bswap) {
76                 ata_bswap_data(buffer, wcount);
77                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
78                 ata_bswap_data(buffer, wcount);
79         } else {
80                 HWIF(drive)->ata_output_data(drive, buffer, wcount);
81         }
82 }
83
84 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
85 {
86         ide_task_t args;
87         memset(&args, 0, sizeof(ide_task_t));
88         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
89         if (drive->media == ide_disk)
90                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_IDENTIFY;
91         else
92                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_PIDENTIFY;
93         args.command_type = IDE_DRIVE_TASK_IN;
94         args.data_phase   = TASKFILE_IN;
95         args.handler      = &task_in_intr;
96         return ide_raw_taskfile(drive, &args, buf);
97 }
98
99 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
100 {
101         ide_hwif_t *hwif        = HWIF(drive);
102         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
103         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
104         u8 HIHI                 = (drive->addressing == 1) ? 0xE0 : 0xEF;
105
106         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
107         if (IDE_CONTROL_REG) {
108                 /* clear nIEN */
109                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
110         }
111         SELECT_MASK(drive, 0);
112
113         if (drive->addressing == 1) {
114                 hwif->OUTB(hobfile->feature, IDE_FEATURE_REG);
115                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
116                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
117                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
118                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
119         }
120
121         hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
122         hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
123         hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
124         hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
125         hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
126
127         hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
128
129         if (task->handler != NULL) {
130                 if (task->prehandler != NULL) {
131                         hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
132                         ndelay(400);    /* FIXME */
133                         return task->prehandler(drive, task->rq);
134                 }
135                 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
136                 return ide_started;
137         }
138
139         if (!drive->using_dma)
140                 return ide_stopped;
141
142         switch (taskfile->command) {
143                 case WIN_WRITEDMA_ONCE:
144                 case WIN_WRITEDMA:
145                 case WIN_WRITEDMA_EXT:
146                 case WIN_READDMA_ONCE:
147                 case WIN_READDMA:
148                 case WIN_READDMA_EXT:
149                 case WIN_IDENTIFY_DMA:
150                         if (!hwif->dma_setup(drive)) {
151                                 hwif->dma_exec_cmd(drive, taskfile->command);
152                                 hwif->dma_start(drive);
153                                 return ide_started;
154                         }
155                         break;
156                 default:
157                         if (task->handler == NULL)
158                                 return ide_stopped;
159         }
160
161         return ide_stopped;
162 }
163
164 EXPORT_SYMBOL(do_rw_taskfile);
165
166 /*
167  * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
168  */
169 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
170 {
171         ide_hwif_t *hwif = HWIF(drive);
172         u8 stat;
173
174         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
175                 drive->mult_count = drive->mult_req;
176         } else {
177                 drive->mult_req = drive->mult_count = 0;
178                 drive->special.b.recalibrate = 1;
179                 (void) ide_dump_status(drive, "set_multmode", stat);
180         }
181         return ide_stopped;
182 }
183
184 /*
185  * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
186  */
187 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
188 {
189         ide_hwif_t *hwif = HWIF(drive);
190         int retries = 5;
191         u8 stat;
192
193         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
194                 udelay(10);
195
196         if (OK_STAT(stat, READY_STAT, BAD_STAT))
197                 return ide_stopped;
198
199         if (stat & (ERR_STAT|DRQ_STAT))
200                 return ide_error(drive, "set_geometry_intr", stat);
201
202         if (HWGROUP(drive)->handler != NULL)
203                 BUG();
204         ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
205         return ide_started;
206 }
207
208 /*
209  * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
210  */
211 ide_startstop_t recal_intr (ide_drive_t *drive)
212 {
213         ide_hwif_t *hwif = HWIF(drive);
214         u8 stat;
215
216         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
217                 return ide_error(drive, "recal_intr", stat);
218         return ide_stopped;
219 }
220
221 /*
222  * Handler for commands without a data phase
223  */
224 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
225 {
226         ide_task_t *args        = HWGROUP(drive)->rq->special;
227         ide_hwif_t *hwif        = HWIF(drive);
228         u8 stat;
229
230         local_irq_enable();
231         if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
232                 return ide_error(drive, "task_no_data_intr", stat);
233                 /* calls ide_end_drive_cmd */
234         }
235         if (args)
236                 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
237
238         return ide_stopped;
239 }
240
241 EXPORT_SYMBOL(task_no_data_intr);
242
243 static u8 wait_drive_not_busy(ide_drive_t *drive)
244 {
245         ide_hwif_t *hwif = HWIF(drive);
246         int retries = 100;
247         u8 stat;
248
249         /*
250          * Last sector was transfered, wait until drive is ready.
251          * This can take up to 10 usec, but we will wait max 1 ms
252          * (drive_cmd_intr() waits that long).
253          */
254         while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
255                 udelay(10);
256
257         if (!retries)
258                 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
259
260         return stat;
261 }
262
263 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
264 {
265         ide_hwif_t *hwif = drive->hwif;
266         struct scatterlist *sg = hwif->sg_table;
267         struct page *page;
268 #ifdef CONFIG_HIGHMEM
269         unsigned long flags;
270 #endif
271         unsigned int offset;
272         u8 *buf;
273
274         page = sg[hwif->cursg].page;
275         offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
276
277         /* get the current page and offset */
278         page = nth_page(page, (offset >> PAGE_SHIFT));
279         offset %= PAGE_SIZE;
280
281 #ifdef CONFIG_HIGHMEM
282         local_irq_save(flags);
283 #endif
284         buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
285
286         hwif->nleft--;
287         hwif->cursg_ofs++;
288
289         if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
290                 hwif->cursg++;
291                 hwif->cursg_ofs = 0;
292         }
293
294         /* do the actual data transfer */
295         if (write)
296                 taskfile_output_data(drive, buf, SECTOR_WORDS);
297         else
298                 taskfile_input_data(drive, buf, SECTOR_WORDS);
299
300         kunmap_atomic(buf, KM_BIO_SRC_IRQ);
301 #ifdef CONFIG_HIGHMEM
302         local_irq_restore(flags);
303 #endif
304 }
305
306 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
307 {
308         unsigned int nsect;
309
310         nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
311         while (nsect--)
312                 ide_pio_sector(drive, write);
313 }
314
315 static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
316                                      unsigned int write)
317 {
318         if (rq->bio)    /* fs request */
319                 rq->errors = 0;
320
321         switch (drive->hwif->data_phase) {
322         case TASKFILE_MULTI_IN:
323         case TASKFILE_MULTI_OUT:
324                 ide_pio_multi(drive, write);
325                 break;
326         default:
327                 ide_pio_sector(drive, write);
328                 break;
329         }
330 }
331
332 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
333                                   const char *s, u8 stat)
334 {
335         if (rq->bio) {
336                 ide_hwif_t *hwif = drive->hwif;
337                 int sectors = hwif->nsect - hwif->nleft;
338
339                 switch (hwif->data_phase) {
340                 case TASKFILE_IN:
341                         if (hwif->nleft)
342                                 break;
343                         /* fall through */
344                 case TASKFILE_OUT:
345                         sectors--;
346                         break;
347                 case TASKFILE_MULTI_IN:
348                         if (hwif->nleft)
349                                 break;
350                         /* fall through */
351                 case TASKFILE_MULTI_OUT:
352                         sectors -= drive->mult_count;
353                 default:
354                         break;
355                 }
356
357                 if (sectors > 0) {
358                         ide_driver_t *drv;
359
360                         drv = *(ide_driver_t **)rq->rq_disk->private_data;
361                         drv->end_request(drive, 1, sectors);
362                 }
363         }
364         return ide_error(drive, s, stat);
365 }
366
367 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
368 {
369         if (rq->flags & REQ_DRIVE_TASKFILE) {
370                 ide_task_t *task = rq->special;
371
372                 if (task->tf_out_flags.all) {
373                         u8 err = drive->hwif->INB(IDE_ERROR_REG);
374                         ide_end_drive_cmd(drive, stat, err);
375                         return;
376                 }
377         }
378
379         ide_end_request(drive, 1, rq->hard_nr_sectors);
380 }
381
382 /*
383  * Handler for command with PIO data-in phase (Read/Read Multiple).
384  */
385 ide_startstop_t task_in_intr (ide_drive_t *drive)
386 {
387         ide_hwif_t *hwif = drive->hwif;
388         struct request *rq = HWGROUP(drive)->rq;
389         u8 stat = hwif->INB(IDE_STATUS_REG);
390
391         /* new way for dealing with premature shared PCI interrupts */
392         if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
393                 if (stat & (ERR_STAT | DRQ_STAT))
394                         return task_error(drive, rq, __FUNCTION__, stat);
395                 /* No data yet, so wait for another IRQ. */
396                 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
397                 return ide_started;
398         }
399
400         ide_pio_datablock(drive, rq, 0);
401
402         /* If it was the last datablock check status and finish transfer. */
403         if (!hwif->nleft) {
404                 stat = wait_drive_not_busy(drive);
405                 if (!OK_STAT(stat, 0, BAD_R_STAT))
406                         return task_error(drive, rq, __FUNCTION__, stat);
407                 task_end_request(drive, rq, stat);
408                 return ide_stopped;
409         }
410
411         /* Still data left to transfer. */
412         ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
413
414         return ide_started;
415 }
416 EXPORT_SYMBOL(task_in_intr);
417
418 /*
419  * Handler for command with PIO data-out phase (Write/Write Multiple).
420  */
421 static ide_startstop_t task_out_intr (ide_drive_t *drive)
422 {
423         ide_hwif_t *hwif = drive->hwif;
424         struct request *rq = HWGROUP(drive)->rq;
425         u8 stat = hwif->INB(IDE_STATUS_REG);
426
427         if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
428                 return task_error(drive, rq, __FUNCTION__, stat);
429
430         /* Deal with unexpected ATA data phase. */
431         if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
432                 return task_error(drive, rq, __FUNCTION__, stat);
433
434         if (!hwif->nleft) {
435                 task_end_request(drive, rq, stat);
436                 return ide_stopped;
437         }
438
439         /* Still data left to transfer. */
440         ide_pio_datablock(drive, rq, 1);
441         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
442
443         return ide_started;
444 }
445
446 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
447 {
448         ide_startstop_t startstop;
449
450         if (ide_wait_stat(&startstop, drive, DATA_READY,
451                           drive->bad_wstat, WAIT_DRQ)) {
452                 printk(KERN_ERR "%s: no DRQ after issuing %sWRITE%s\n",
453                                 drive->name,
454                                 drive->hwif->data_phase ? "MULT" : "",
455                                 drive->addressing ? "_EXT" : "");
456                 return startstop;
457         }
458
459         if (!drive->unmask)
460                 local_irq_disable();
461
462         ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
463         ide_pio_datablock(drive, rq, 1);
464
465         return ide_started;
466 }
467 EXPORT_SYMBOL(pre_task_out_intr);
468
469 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
470 {
471         struct request rq;
472
473         memset(&rq, 0, sizeof(rq));
474         rq.flags = REQ_DRIVE_TASKFILE;
475         rq.buffer = buf;
476
477         /*
478          * (ks) We transfer currently only whole sectors.
479          * This is suffient for now.  But, it would be great,
480          * if we would find a solution to transfer any size.
481          * To support special commands like READ LONG.
482          */
483         if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
484                 if (data_size == 0)
485                         rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
486                 else
487                         rq.nr_sectors = data_size / SECTOR_SIZE;
488
489                 if (!rq.nr_sectors) {
490                         printk(KERN_ERR "%s: in/out command without data\n",
491                                         drive->name);
492                         return -EFAULT;
493                 }
494
495                 rq.hard_nr_sectors = rq.nr_sectors;
496                 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
497
498                 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
499                         rq.flags |= REQ_RW;
500         }
501
502         rq.special = args;
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 = kmalloc(tasksize, GFP_KERNEL);
531         if (req_task == NULL) return -ENOMEM;
532         memset(req_task, 0, tasksize);
533         if (copy_from_user(req_task, buf, tasksize)) {
534                 kfree(req_task);
535                 return -EFAULT;
536         }
537
538         taskout = (int) req_task->out_size;
539         taskin  = (int) req_task->in_size;
540
541         if (taskout) {
542                 int outtotal = tasksize;
543                 outbuf = kmalloc(taskout, GFP_KERNEL);
544                 if (outbuf == NULL) {
545                         err = -ENOMEM;
546                         goto abort;
547                 }
548                 memset(outbuf, 0, taskout);
549                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
550                         err = -EFAULT;
551                         goto abort;
552                 }
553         }
554
555         if (taskin) {
556                 int intotal = tasksize + taskout;
557                 inbuf = kmalloc(taskin, GFP_KERNEL);
558                 if (inbuf == NULL) {
559                         err = -ENOMEM;
560                         goto abort;
561                 }
562                 memset(inbuf, 0, taskin);
563                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
564                         err = -EFAULT;
565                         goto abort;
566                 }
567         }
568
569         memset(&args, 0, sizeof(ide_task_t));
570         memcpy(argsptr, req_task->io_ports, HDIO_DRIVE_TASK_HDR_SIZE);
571         memcpy(hobsptr, req_task->hob_ports, HDIO_DRIVE_HOB_HDR_SIZE);
572
573         args.tf_in_flags  = req_task->in_flags;
574         args.tf_out_flags = req_task->out_flags;
575         args.data_phase   = req_task->data_phase;
576         args.command_type = req_task->req_cmd;
577
578         drive->io_32bit = 0;
579         switch(req_task->data_phase) {
580                 case TASKFILE_OUT_DMAQ:
581                 case TASKFILE_OUT_DMA:
582                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
583                         break;
584                 case TASKFILE_IN_DMAQ:
585                 case TASKFILE_IN_DMA:
586                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
587                         break;
588                 case TASKFILE_MULTI_OUT:
589                         if (!drive->mult_count) {
590                                 /* (hs): give up if multcount is not set */
591                                 printk(KERN_ERR "%s: %s Multimode Write " \
592                                         "multcount is not set\n",
593                                         drive->name, __FUNCTION__);
594                                 err = -EPERM;
595                                 goto abort;
596                         }
597                         /* fall through */
598                 case TASKFILE_OUT:
599                         args.prehandler = &pre_task_out_intr;
600                         args.handler = &task_out_intr;
601                         err = ide_diag_taskfile(drive, &args, taskout, outbuf);
602                         break;
603                 case TASKFILE_MULTI_IN:
604                         if (!drive->mult_count) {
605                                 /* (hs): give up if multcount is not set */
606                                 printk(KERN_ERR "%s: %s Multimode Read failure " \
607                                         "multcount is not set\n",
608                                         drive->name, __FUNCTION__);
609                                 err = -EPERM;
610                                 goto abort;
611                         }
612                         /* fall through */
613                 case TASKFILE_IN:
614                         args.handler = &task_in_intr;
615                         err = ide_diag_taskfile(drive, &args, taskin, inbuf);
616                         break;
617                 case TASKFILE_NO_DATA:
618                         args.handler = &task_no_data_intr;
619                         err = ide_diag_taskfile(drive, &args, 0, NULL);
620                         break;
621                 default:
622                         err = -EFAULT;
623                         goto abort;
624         }
625
626         memcpy(req_task->io_ports, &(args.tfRegister), HDIO_DRIVE_TASK_HDR_SIZE);
627         memcpy(req_task->hob_ports, &(args.hobRegister), HDIO_DRIVE_HOB_HDR_SIZE);
628         req_task->in_flags  = args.tf_in_flags;
629         req_task->out_flags = args.tf_out_flags;
630
631         if (copy_to_user(buf, req_task, tasksize)) {
632                 err = -EFAULT;
633                 goto abort;
634         }
635         if (taskout) {
636                 int outtotal = tasksize;
637                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
638                         err = -EFAULT;
639                         goto abort;
640                 }
641         }
642         if (taskin) {
643                 int intotal = tasksize + taskout;
644                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
645                         err = -EFAULT;
646                         goto abort;
647                 }
648         }
649 abort:
650         kfree(req_task);
651         if (outbuf != NULL)
652                 kfree(outbuf);
653         if (inbuf != NULL)
654                 kfree(inbuf);
655
656 //      printk("IDE Taskfile ioctl ended. rc = %i\n", err);
657
658         drive->io_32bit = io_32bit;
659
660         return err;
661 }
662
663 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
664 {
665         struct request rq;
666         u8 buffer[4];
667
668         if (!buf)
669                 buf = buffer;
670         memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
671         ide_init_drive_cmd(&rq);
672         rq.buffer = buf;
673         *buf++ = cmd;
674         *buf++ = nsect;
675         *buf++ = feature;
676         *buf++ = sectors;
677         return ide_do_drive_cmd(drive, &rq, ide_wait);
678 }
679
680 /*
681  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
682  */
683 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
684 {
685         int err = 0;
686         u8 args[4], *argbuf = args;
687         u8 xfer_rate = 0;
688         int argsize = 4;
689         ide_task_t tfargs;
690
691         if (NULL == (void *) arg) {
692                 struct request rq;
693                 ide_init_drive_cmd(&rq);
694                 return ide_do_drive_cmd(drive, &rq, ide_wait);
695         }
696
697         if (copy_from_user(args, (void __user *)arg, 4))
698                 return -EFAULT;
699
700         memset(&tfargs, 0, sizeof(ide_task_t));
701         tfargs.tfRegister[IDE_FEATURE_OFFSET] = args[2];
702         tfargs.tfRegister[IDE_NSECTOR_OFFSET] = args[3];
703         tfargs.tfRegister[IDE_SECTOR_OFFSET]  = args[1];
704         tfargs.tfRegister[IDE_LCYL_OFFSET]    = 0x00;
705         tfargs.tfRegister[IDE_HCYL_OFFSET]    = 0x00;
706         tfargs.tfRegister[IDE_SELECT_OFFSET]  = 0x00;
707         tfargs.tfRegister[IDE_COMMAND_OFFSET] = args[0];
708
709         if (args[3]) {
710                 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
711                 argbuf = kmalloc(argsize, GFP_KERNEL);
712                 if (argbuf == NULL)
713                         return -ENOMEM;
714                 memcpy(argbuf, args, 4);
715         }
716         if (set_transfer(drive, &tfargs)) {
717                 xfer_rate = args[1];
718                 if (ide_ata66_check(drive, &tfargs))
719                         goto abort;
720         }
721
722         err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
723
724         if (!err && xfer_rate) {
725                 /* active-retuning-calls future */
726                 ide_set_xfer_rate(drive, xfer_rate);
727                 ide_driveid_update(drive);
728         }
729 abort:
730         if (copy_to_user((void __user *)arg, argbuf, argsize))
731                 err = -EFAULT;
732         if (argsize > 4)
733                 kfree(argbuf);
734         return err;
735 }
736
737 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
738 {
739         struct request rq;
740
741         ide_init_drive_cmd(&rq);
742         rq.flags = REQ_DRIVE_TASK;
743         rq.buffer = buf;
744         return ide_do_drive_cmd(drive, &rq, ide_wait);
745 }
746
747 /*
748  * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
749  */
750 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
751 {
752         void __user *p = (void __user *)arg;
753         int err = 0;
754         u8 args[7], *argbuf = args;
755         int argsize = 7;
756
757         if (copy_from_user(args, p, 7))
758                 return -EFAULT;
759         err = ide_wait_cmd_task(drive, argbuf);
760         if (copy_to_user(p, argbuf, argsize))
761                 err = -EFAULT;
762         return err;
763 }
764
765 /*
766  * NOTICE: This is additions from IBM to provide a discrete interface,
767  * for selective taskregister access operations.  Nice JOB Klaus!!!
768  * Glad to be able to work and co-develop this with you and IBM.
769  */
770 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
771 {
772         ide_hwif_t *hwif        = HWIF(drive);
773         task_struct_t *taskfile = (task_struct_t *) task->tfRegister;
774         hob_struct_t *hobfile   = (hob_struct_t *) task->hobRegister;
775 #if DEBUG_TASKFILE
776         u8 status;
777 #endif
778
779         if (task->data_phase == TASKFILE_MULTI_IN ||
780             task->data_phase == TASKFILE_MULTI_OUT) {
781                 if (!drive->mult_count) {
782                         printk(KERN_ERR "%s: multimode not set!\n", drive->name);
783                         return ide_stopped;
784                 }
785         }
786
787         /*
788          * (ks) Check taskfile in/out flags.
789          * If set, then execute as it is defined.
790          * If not set, then define default settings.
791          * The default values are:
792          *      write and read all taskfile registers (except data) 
793          *      write and read the hob registers (sector,nsector,lcyl,hcyl)
794          */
795         if (task->tf_out_flags.all == 0) {
796                 task->tf_out_flags.all = IDE_TASKFILE_STD_OUT_FLAGS;
797                 if (drive->addressing == 1)
798                         task->tf_out_flags.all |= (IDE_HOB_STD_OUT_FLAGS << 8);
799         }
800
801         if (task->tf_in_flags.all == 0) {
802                 task->tf_in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
803                 if (drive->addressing == 1)
804                         task->tf_in_flags.all |= (IDE_HOB_STD_IN_FLAGS  << 8);
805         }
806
807         /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
808         if (IDE_CONTROL_REG)
809                 /* clear nIEN */
810                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
811         SELECT_MASK(drive, 0);
812
813 #if DEBUG_TASKFILE
814         status = hwif->INB(IDE_STATUS_REG);
815         if (status & 0x80) {
816                 printk("flagged_taskfile -> Bad status. Status = %02x. wait 100 usec ...\n", status);
817                 udelay(100);
818                 status = hwif->INB(IDE_STATUS_REG);
819                 printk("flagged_taskfile -> Status = %02x\n", status);
820         }
821 #endif
822
823         if (task->tf_out_flags.b.data) {
824                 u16 data =  taskfile->data + (hobfile->data << 8);
825                 hwif->OUTW(data, IDE_DATA_REG);
826         }
827
828         /* (ks) send hob registers first */
829         if (task->tf_out_flags.b.nsector_hob)
830                 hwif->OUTB(hobfile->sector_count, IDE_NSECTOR_REG);
831         if (task->tf_out_flags.b.sector_hob)
832                 hwif->OUTB(hobfile->sector_number, IDE_SECTOR_REG);
833         if (task->tf_out_flags.b.lcyl_hob)
834                 hwif->OUTB(hobfile->low_cylinder, IDE_LCYL_REG);
835         if (task->tf_out_flags.b.hcyl_hob)
836                 hwif->OUTB(hobfile->high_cylinder, IDE_HCYL_REG);
837
838         /* (ks) Send now the standard registers */
839         if (task->tf_out_flags.b.error_feature)
840                 hwif->OUTB(taskfile->feature, IDE_FEATURE_REG);
841         /* refers to number of sectors to transfer */
842         if (task->tf_out_flags.b.nsector)
843                 hwif->OUTB(taskfile->sector_count, IDE_NSECTOR_REG);
844         /* refers to sector offset or start sector */
845         if (task->tf_out_flags.b.sector)
846                 hwif->OUTB(taskfile->sector_number, IDE_SECTOR_REG);
847         if (task->tf_out_flags.b.lcyl)
848                 hwif->OUTB(taskfile->low_cylinder, IDE_LCYL_REG);
849         if (task->tf_out_flags.b.hcyl)
850                 hwif->OUTB(taskfile->high_cylinder, IDE_HCYL_REG);
851
852         /*
853          * (ks) In the flagged taskfile approch, we will use all specified
854          * registers and the register value will not be changed, except the
855          * select bit (master/slave) in the drive_head register. We must make
856          * sure that the desired drive is selected.
857          */
858         hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
859         switch(task->data_phase) {
860
861                 case TASKFILE_OUT_DMAQ:
862                 case TASKFILE_OUT_DMA:
863                 case TASKFILE_IN_DMAQ:
864                 case TASKFILE_IN_DMA:
865                         hwif->dma_setup(drive);
866                         hwif->dma_exec_cmd(drive, taskfile->command);
867                         hwif->dma_start(drive);
868                         break;
869
870                 default:
871                         if (task->handler == NULL)
872                                 return ide_stopped;
873
874                         /* Issue the command */
875                         if (task->prehandler) {
876                                 hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
877                                 ndelay(400);    /* FIXME */
878                                 return task->prehandler(drive, task->rq);
879                         }
880                         ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
881         }
882
883         return ide_started;
884 }