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authorTejun Heo <htejun@gmail.com>2007-12-05 16:43:07 +0900
committerJeff Garzik <jeff@garzik.org>2008-01-23 05:24:14 -0500
commit55dba3120fbcbea6800f9a18503d25f73212a347 (patch)
tree1b23e606aad8bc58dbe68ca905c0658625fb176e /drivers/ata/pata_bf54x.c
parentceb0c642624f634c5b4f46b0e22df19be87a2e53 (diff)
libata: update ->data_xfer hook for ATAPI
Depending on how many bytes are transferred as a unit, PIO data transfer may consume more bytes than requested. Knowing how much data is consumed is necessary to determine how much is left for draining. This patch update ->data_xfer such that it returns the number of consumed bytes. While at it, it also makes the following changes. * s/adev/dev/ * use READ/WRITE constants for rw indication * misc clean ups Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_bf54x.c')
-rw-r--r--drivers/ata/pata_bf54x.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c
index 7842cc48735..41cd921082b 100644
--- a/drivers/ata/pata_bf54x.c
+++ b/drivers/ata/pata_bf54x.c
@@ -1167,34 +1167,36 @@ static unsigned char bfin_bmdma_status(struct ata_port *ap)
* Note: Original code is ata_data_xfer().
*/
-static void bfin_data_xfer(struct ata_device *adev, unsigned char *buf,
- unsigned int buflen, int write_data)
+static unsigned int bfin_data_xfer(struct ata_device *dev, unsigned char *buf,
+ unsigned int buflen, int rw)
{
- struct ata_port *ap = adev->link->ap;
- unsigned int words = buflen >> 1;
- unsigned short *buf16 = (u16 *) buf;
+ struct ata_port *ap = dev->link->ap;
void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr;
+ unsigned int words = buflen >> 1;
+ unsigned short *buf16 = (u16 *)buf;
/* Transfer multiple of 2 bytes */
- if (write_data) {
- write_atapi_data(base, words, buf16);
- } else {
+ if (rw == READ)
read_atapi_data(base, words, buf16);
- }
+ else
+ write_atapi_data(base, words, buf16);
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
unsigned short align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
- if (write_data) {
- memcpy(align_buf, trailing_buf, 1);
- write_atapi_data(base, 1, align_buf);
- } else {
+ if (rw == READ) {
read_atapi_data(base, 1, align_buf);
memcpy(trailing_buf, align_buf, 1);
+ } else {
+ memcpy(align_buf, trailing_buf, 1);
+ write_atapi_data(base, 1, align_buf);
}
+ words++;
}
+
+ return words << 1;
}
/**