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ide-disk: add ide_tf_set_cmd() helper 

* Add ide_tf_set_cmd() helper for selecting/setting command and data phase
  (note: DMA data phases are there for completness, they are not required ATM).

* Set IDE_TFLAG_WRITE taskfile flag for write requests in __ide_do_rw_disk().

* Convert __ide_do_rw_disk() to use the new ide_tf_set_cmd() helper.

There should be no functionality changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-01-25 22:17:16 +01:00
parent c52ea915d7
commit ba76ae3883
1 changed files with 55 additions and 30 deletions
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85
drivers/ide/ide-disk.c
View File

@ -129,6 +129,50 @@ static int lba_capacity_is_ok (struct hd_driveid *id)
return 0; /* lba_capacity value may be bad */
}
static const u8 ide_rw_cmds[] = {
WIN_MULTREAD,
WIN_MULTWRITE,
WIN_MULTREAD_EXT,
WIN_MULTWRITE_EXT,
WIN_READ,
WIN_WRITE,
WIN_READ_EXT,
WIN_WRITE_EXT,
WIN_READDMA,
WIN_WRITEDMA,
WIN_READDMA_EXT,
WIN_WRITEDMA_EXT,
};
static const u8 ide_data_phases[] = {
TASKFILE_MULTI_IN,
TASKFILE_MULTI_OUT,
TASKFILE_IN,
TASKFILE_OUT,
TASKFILE_IN_DMA,
TASKFILE_OUT_DMA,
};
static void ide_tf_set_cmd(ide_drive_t *drive, ide_task_t *task, u8 dma)
{
u8 index, lba48, write;
lba48 = (task->tf_flags & IDE_TFLAG_LBA48) ? 2 : 0;
write = (task->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0;
if (dma)
index = drive->vdma ? 4 : 8;
else
index = drive->mult_count ? 0 : 4;
task->tf.command = ide_rw_cmds[index + lba48 + write];
if (dma)
index = 8; /* fixup index */
task->data_phase = ide_data_phases[index / 2 + write];
}
/*
* __ide_do_rw_disk() issues READ and WRITE commands to a disk,
* using LBA if supported, or CHS otherwise, to address sectors.
@ -139,7 +183,6 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
unsigned int dma = drive->using_dma;
u16 nsectors = (u16)rq->nr_sectors;
u8 lba48 = (drive->addressing == 1) ? 1 : 0;
u8 command = WIN_NOP;
ide_task_t task;
struct ide_taskfile *tf = &task.tf;
@ -205,50 +248,32 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
tf->device = head;
}
if (rq_data_dir(rq))
task.tf_flags |= IDE_TFLAG_WRITE;
ide_tf_set_cmd(drive, &task, dma);
ide_tf_load(drive, &task);
if (dma) {
if (!hwif->dma_setup(drive)) {
if (rq_data_dir(rq)) {
command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
if (drive->vdma)
command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
} else {
command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
if (drive->vdma)
command = lba48 ? WIN_READ_EXT: WIN_READ;
}
hwif->dma_exec_cmd(drive, command);
hwif->dma_exec_cmd(drive, tf->command);
hwif->dma_start(drive);
return ide_started;
}
/* fallback to PIO */
ide_tf_set_cmd(drive, &task, 0);
ide_init_sg_cmd(drive, rq);
}
hwif->data_phase = task.data_phase;
if (rq_data_dir(rq) == READ) {
if (drive->mult_count) {
hwif->data_phase = TASKFILE_MULTI_IN;
command = lba48 ? WIN_MULTREAD_EXT : WIN_MULTREAD;
} else {
hwif->data_phase = TASKFILE_IN;
command = lba48 ? WIN_READ_EXT : WIN_READ;
}
ide_execute_command(drive, command, &task_in_intr,
ide_execute_command(drive, tf->command, &task_in_intr,
WAIT_WORSTCASE, NULL);
return ide_started;
} else {
if (drive->mult_count) {
hwif->data_phase = TASKFILE_MULTI_OUT;
command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
} else {
hwif->data_phase = TASKFILE_OUT;
command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
}
hwif->OUTBSYNC(drive, command, IDE_COMMAND_REG);
hwif->OUTBSYNC(drive, tf->command, IDE_COMMAND_REG);
ndelay(400); /* FIXME */
return pre_task_out_intr(drive, rq);