2 * linux/drivers/ide/ide-taskfile.c Version 0.38 March 05, 2003
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
10 * The big the bad and the ugly.
12 * Problems to be fixed because of BH interface or the lack therefore.
14 * Fill me in stupid !!!
17 * General refers to the Controller and Driver "pair".
19 * Under the context of Linux it generally refers to an interrupt handler.
20 * However, it correctly describes the 'HOST'
22 * The amount of data needed to be transfered as predefined in the
23 * setup of the device.
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
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>
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>
49 #include <asm/byteorder.h>
51 #include <asm/uaccess.h>
54 #define DEBUG_TASKFILE 0 /* unset when fixed */
56 static void ata_bswap_data (void *buffer, int wcount)
61 *p = *p << 8 | *p >> 8; p++;
62 *p = *p << 8 | *p >> 8; p++;
66 static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
68 HWIF(drive)->ata_input_data(drive, buffer, wcount);
70 ata_bswap_data(buffer, wcount);
73 static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
76 ata_bswap_data(buffer, wcount);
77 HWIF(drive)->ata_output_data(drive, buffer, wcount);
78 ata_bswap_data(buffer, wcount);
80 HWIF(drive)->ata_output_data(drive, buffer, wcount);
84 int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf)
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;
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);
99 ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task)
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;
106 /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
107 if (IDE_CONTROL_REG) {
109 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
111 SELECT_MASK(drive, 0);
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);
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);
127 hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
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);
135 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
139 if (!drive->using_dma)
142 switch (taskfile->command) {
143 case WIN_WRITEDMA_ONCE:
145 case WIN_WRITEDMA_EXT:
146 case WIN_READDMA_ONCE:
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);
157 if (task->handler == NULL)
164 EXPORT_SYMBOL(do_rw_taskfile);
167 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
169 ide_startstop_t set_multmode_intr (ide_drive_t *drive)
171 ide_hwif_t *hwif = HWIF(drive);
174 if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
175 drive->mult_count = drive->mult_req;
177 drive->mult_req = drive->mult_count = 0;
178 drive->special.b.recalibrate = 1;
179 (void) ide_dump_status(drive, "set_multmode", stat);
185 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
187 ide_startstop_t set_geometry_intr (ide_drive_t *drive)
189 ide_hwif_t *hwif = HWIF(drive);
193 while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
196 if (OK_STAT(stat, READY_STAT, BAD_STAT))
199 if (stat & (ERR_STAT|DRQ_STAT))
200 return ide_error(drive, "set_geometry_intr", stat);
202 if (HWGROUP(drive)->handler != NULL)
204 ide_set_handler(drive, &set_geometry_intr, WAIT_WORSTCASE, NULL);
209 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
211 ide_startstop_t recal_intr (ide_drive_t *drive)
213 ide_hwif_t *hwif = HWIF(drive);
216 if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), READY_STAT, BAD_STAT))
217 return ide_error(drive, "recal_intr", stat);
222 * Handler for commands without a data phase
224 ide_startstop_t task_no_data_intr (ide_drive_t *drive)
226 ide_task_t *args = HWGROUP(drive)->rq->special;
227 ide_hwif_t *hwif = HWIF(drive);
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 */
236 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
241 EXPORT_SYMBOL(task_no_data_intr);
243 static u8 wait_drive_not_busy(ide_drive_t *drive)
245 ide_hwif_t *hwif = HWIF(drive);
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).
254 while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
258 printk(KERN_ERR "%s: drive still BUSY!\n", drive->name);
263 static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
265 ide_hwif_t *hwif = drive->hwif;
266 struct scatterlist *sg = hwif->sg_table;
268 #ifdef CONFIG_HIGHMEM
274 page = sg[hwif->cursg].page;
275 offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
277 /* get the current page and offset */
278 page = nth_page(page, (offset >> PAGE_SHIFT));
281 #ifdef CONFIG_HIGHMEM
282 local_irq_save(flags);
284 buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
289 if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
294 /* do the actual data transfer */
296 taskfile_output_data(drive, buf, SECTOR_WORDS);
298 taskfile_input_data(drive, buf, SECTOR_WORDS);
300 kunmap_atomic(buf, KM_BIO_SRC_IRQ);
301 #ifdef CONFIG_HIGHMEM
302 local_irq_restore(flags);
306 static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
310 nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
312 ide_pio_sector(drive, write);
315 static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
318 if (rq->bio) /* fs request */
321 switch (drive->hwif->data_phase) {
322 case TASKFILE_MULTI_IN:
323 case TASKFILE_MULTI_OUT:
324 ide_pio_multi(drive, write);
327 ide_pio_sector(drive, write);
332 static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
333 const char *s, u8 stat)
336 ide_hwif_t *hwif = drive->hwif;
337 int sectors = hwif->nsect - hwif->nleft;
339 switch (hwif->data_phase) {
347 case TASKFILE_MULTI_IN:
351 case TASKFILE_MULTI_OUT:
352 sectors -= drive->mult_count;
360 drv = *(ide_driver_t **)rq->rq_disk->private_data;
361 drv->end_request(drive, 1, sectors);
364 return ide_error(drive, s, stat);
367 static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
369 if (rq->flags & REQ_DRIVE_TASKFILE) {
370 ide_task_t *task = rq->special;
372 if (task->tf_out_flags.all) {
373 u8 err = drive->hwif->INB(IDE_ERROR_REG);
374 ide_end_drive_cmd(drive, stat, err);
379 ide_end_request(drive, 1, rq->hard_nr_sectors);
383 * Handler for command with PIO data-in phase (Read/Read Multiple).
385 ide_startstop_t task_in_intr (ide_drive_t *drive)
387 ide_hwif_t *hwif = drive->hwif;
388 struct request *rq = HWGROUP(drive)->rq;
389 u8 stat = hwif->INB(IDE_STATUS_REG);
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);
400 ide_pio_datablock(drive, rq, 0);
402 /* If it was the last datablock check status and finish transfer. */
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);
411 /* Still data left to transfer. */
412 ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
416 EXPORT_SYMBOL(task_in_intr);
419 * Handler for command with PIO data-out phase (Write/Write Multiple).
421 static ide_startstop_t task_out_intr (ide_drive_t *drive)
423 ide_hwif_t *hwif = drive->hwif;
424 struct request *rq = HWGROUP(drive)->rq;
425 u8 stat = hwif->INB(IDE_STATUS_REG);
427 if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat))
428 return task_error(drive, rq, __FUNCTION__, stat);
430 /* Deal with unexpected ATA data phase. */
431 if (((stat & DRQ_STAT) == 0) ^ !hwif->nleft)
432 return task_error(drive, rq, __FUNCTION__, stat);
435 task_end_request(drive, rq, stat);
439 /* Still data left to transfer. */
440 ide_pio_datablock(drive, rq, 1);
441 ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
446 ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
448 ide_startstop_t startstop;
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",
454 drive->hwif->data_phase ? "MULT" : "",
455 drive->addressing ? "_EXT" : "");
462 ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
463 ide_pio_datablock(drive, rq, 1);
467 EXPORT_SYMBOL(pre_task_out_intr);
469 static int ide_diag_taskfile(ide_drive_t *drive, ide_task_t *args, unsigned long data_size, u8 *buf)
473 memset(&rq, 0, sizeof(rq));
474 rq.flags = REQ_DRIVE_TASKFILE;
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.
483 if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
485 rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
487 rq.nr_sectors = data_size / SECTOR_SIZE;
489 if (!rq.nr_sectors) {
490 printk(KERN_ERR "%s: in/out command without data\n",
495 rq.hard_nr_sectors = rq.nr_sectors;
496 rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
498 if (args->command_type == IDE_DRIVE_TASK_RAW_WRITE)
503 return ide_do_drive_cmd(drive, &rq, ide_wait);
506 int ide_raw_taskfile (ide_drive_t *drive, ide_task_t *args, u8 *buf)
508 return ide_diag_taskfile(drive, args, 0, buf);
511 EXPORT_SYMBOL(ide_raw_taskfile);
513 int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
515 ide_task_request_t *req_task;
519 task_ioreg_t *argsptr = args.tfRegister;
520 task_ioreg_t *hobsptr = args.hobRegister;
522 int tasksize = sizeof(struct ide_task_request_s);
525 u8 io_32bit = drive->io_32bit;
526 char __user *buf = (char __user *)arg;
528 // printk("IDE Taskfile ...\n");
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)) {
538 taskout = (int) req_task->out_size;
539 taskin = (int) req_task->in_size;
542 int outtotal = tasksize;
543 outbuf = kmalloc(taskout, GFP_KERNEL);
544 if (outbuf == NULL) {
548 memset(outbuf, 0, taskout);
549 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
556 int intotal = tasksize + taskout;
557 inbuf = kmalloc(taskin, GFP_KERNEL);
562 memset(inbuf, 0, taskin);
563 if (copy_from_user(inbuf, buf + intotal, taskin)) {
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);
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;
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);
584 case TASKFILE_IN_DMAQ:
585 case TASKFILE_IN_DMA:
586 err = ide_diag_taskfile(drive, &args, taskin, inbuf);
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__);
599 args.prehandler = &pre_task_out_intr;
600 args.handler = &task_out_intr;
601 err = ide_diag_taskfile(drive, &args, taskout, outbuf);
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__);
614 args.handler = &task_in_intr;
615 err = ide_diag_taskfile(drive, &args, taskin, inbuf);
617 case TASKFILE_NO_DATA:
618 args.handler = &task_no_data_intr;
619 err = ide_diag_taskfile(drive, &args, 0, NULL);
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;
631 if (copy_to_user(buf, req_task, tasksize)) {
636 int outtotal = tasksize;
637 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
643 int intotal = tasksize + taskout;
644 if (copy_to_user(buf + intotal, inbuf, taskin)) {
656 // printk("IDE Taskfile ioctl ended. rc = %i\n", err);
658 drive->io_32bit = io_32bit;
663 int ide_wait_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
670 memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
671 ide_init_drive_cmd(&rq);
677 return ide_do_drive_cmd(drive, &rq, ide_wait);
681 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
683 int ide_cmd_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
686 u8 args[4], *argbuf = args;
691 if (NULL == (void *) arg) {
693 ide_init_drive_cmd(&rq);
694 return ide_do_drive_cmd(drive, &rq, ide_wait);
697 if (copy_from_user(args, (void __user *)arg, 4))
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];
710 argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
711 argbuf = kmalloc(argsize, GFP_KERNEL);
714 memcpy(argbuf, args, 4);
716 if (set_transfer(drive, &tfargs)) {
718 if (ide_ata66_check(drive, &tfargs))
722 err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
724 if (!err && xfer_rate) {
725 /* active-retuning-calls future */
726 ide_set_xfer_rate(drive, xfer_rate);
727 ide_driveid_update(drive);
730 if (copy_to_user((void __user *)arg, argbuf, argsize))
737 static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
741 ide_init_drive_cmd(&rq);
742 rq.flags = REQ_DRIVE_TASK;
744 return ide_do_drive_cmd(drive, &rq, ide_wait);
748 * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
750 int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
752 void __user *p = (void __user *)arg;
754 u8 args[7], *argbuf = args;
757 if (copy_from_user(args, p, 7))
759 err = ide_wait_cmd_task(drive, argbuf);
760 if (copy_to_user(p, argbuf, argsize))
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.
770 ide_startstop_t flagged_taskfile (ide_drive_t *drive, ide_task_t *task)
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;
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);
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)
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);
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);
807 /* ALL Command Block Executions SHALL clear nIEN, unless otherwise */
810 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
811 SELECT_MASK(drive, 0);
814 status = hwif->INB(IDE_STATUS_REG);
816 printk("flagged_taskfile -> Bad status. Status = %02x. wait 100 usec ...\n", status);
818 status = hwif->INB(IDE_STATUS_REG);
819 printk("flagged_taskfile -> Status = %02x\n", status);
823 if (task->tf_out_flags.b.data) {
824 u16 data = taskfile->data + (hobfile->data << 8);
825 hwif->OUTW(data, IDE_DATA_REG);
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);
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);
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.
858 hwif->OUTB(taskfile->device_head | drive->select.all, IDE_SELECT_REG);
859 switch(task->data_phase) {
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);
871 if (task->handler == NULL)
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);
880 ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);