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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-03-31 20:14:59 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-03-31 20:14:59 +0200
commit7a00798b1a7502ff31736152b23189138db0b978 (patch)
tree5bea3ccc3eb55112ce678cfd9a3d1703b83e30af /drivers/ide/ide-taskfile.c
parent2eba08270990b99fb5429b76ee97184ddd272f7f (diff)
ide: add support for arbitrary transfer lengths to ide_pio_bytes()
Add support for arbitrary transfer lengths to ide_pio_bytes() and then inline ide_pio_multi() into ide_pio_datablock(). There should be no functional changes caused by this patch. Cc: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-taskfile.c')
-rw-r--r--drivers/ide/ide-taskfile.c73
1 files changed, 37 insertions, 36 deletions
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 84532be97c00..8d7e87d04b3b 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -189,7 +189,7 @@ static u8 wait_drive_not_busy(ide_drive_t *drive)
}
static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
- unsigned int write, unsigned int nr_bytes)
+ unsigned int write, unsigned int len)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@@ -202,56 +202,55 @@ static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
u8 *buf;
cursg = cmd->cursg;
- if (!cursg) {
- cursg = sg;
- cmd->cursg = sg;
- }
+ if (cursg == NULL)
+ cursg = cmd->cursg = sg;
+
+ while (len) {
+ unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
- page = sg_page(cursg);
- offset = cursg->offset + cmd->cursg_ofs;
+ if (nr_bytes > PAGE_SIZE)
+ nr_bytes = PAGE_SIZE;
- /* get the current page and offset */
- page = nth_page(page, (offset >> PAGE_SHIFT));
- offset %= PAGE_SIZE;
+ page = sg_page(cursg);
+ offset = cursg->offset + cmd->cursg_ofs;
+
+ /* get the current page and offset */
+ page = nth_page(page, (offset >> PAGE_SHIFT));
+ offset %= PAGE_SIZE;
#ifdef CONFIG_HIGHMEM
- local_irq_save(flags);
+ local_irq_save(flags);
#endif
- buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
+ buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
- cmd->nleft -= nr_bytes;
- cmd->cursg_ofs += nr_bytes;
+ cmd->nleft -= nr_bytes;
+ cmd->cursg_ofs += nr_bytes;
- if (cmd->cursg_ofs == cursg->length) {
- cmd->cursg = sg_next(cmd->cursg);
- cmd->cursg_ofs = 0;
- }
+ if (cmd->cursg_ofs == cursg->length) {
+ cursg = cmd->cursg = sg_next(cmd->cursg);
+ cmd->cursg_ofs = 0;
+ }
- /* do the actual data transfer */
- if (write)
- hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
- else
- hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
+ /* do the actual data transfer */
+ if (write)
+ hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
+ else
+ hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
- kunmap_atomic(buf, KM_BIO_SRC_IRQ);
+ kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
- local_irq_restore(flags);
+ local_irq_restore(flags);
#endif
-}
-
-static void ide_pio_multi(ide_drive_t *drive, struct ide_cmd *cmd,
- unsigned int write)
-{
- unsigned int nsect;
- nsect = min_t(unsigned int, cmd->nleft >> 9, drive->mult_count);
- while (nsect--)
- ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
+ len -= nr_bytes;
+ }
}
static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write)
{
+ unsigned int nr_bytes;
+
u8 saved_io_32bit = drive->io_32bit;
if (cmd->tf_flags & IDE_TFLAG_FS)
@@ -263,9 +262,11 @@ static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
touch_softlockup_watchdog();
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
- ide_pio_multi(drive, cmd, write);
+ nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
else
- ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
+ nr_bytes = SECTOR_SIZE;
+
+ ide_pio_bytes(drive, cmd, write, nr_bytes);
drive->io_32bit = saved_io_32bit;
}