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authorTejun Heo <htejun@gmail.com>2007-12-05 10:43:07 +0300
committerJeff Garzik <jeff@garzik.org>2008-01-23 13:24:14 +0300
commit55dba3120fbcbea6800f9a18503d25f73212a347 (patch)
tree1b23e606aad8bc58dbe68ca905c0658625fb176e /drivers/ata/pata_legacy.c
parentceb0c642624f634c5b4f46b0e22df19be87a2e53 (diff)
downloadlinux-55dba3120fbcbea6800f9a18503d25f73212a347.tar.xz
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_legacy.c')
-rw-r--r--drivers/ata/pata_legacy.c36
1 files changed, 19 insertions, 17 deletions
diff --git a/drivers/ata/pata_legacy.c b/drivers/ata/pata_legacy.c
index 17159b5e1e43..dae85aa12e32 100644
--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -249,13 +249,14 @@ static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev)
}
-static void pdc_data_xfer_vlb(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
+static unsigned int pdc_data_xfer_vlb(struct ata_device *dev,
+ unsigned char *buf, unsigned int buflen, int rw)
{
- struct ata_port *ap = adev->link->ap;
- int slop = buflen & 3;
- unsigned long flags;
-
if (ata_id_has_dword_io(adev->id)) {
+ struct ata_port *ap = dev->link->ap;
+ int slop = buflen & 3;
+ unsigned long flags;
+
local_irq_save(flags);
/* Perform the 32bit I/O synchronization sequence */
@@ -264,26 +265,27 @@ static void pdc_data_xfer_vlb(struct ata_device *adev, unsigned char *buf, unsig
ioread8(ap->ioaddr.nsect_addr);
/* Now the data */
-
- if (write_data)
- iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
- else
+ if (rw == READ)
ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
+ else
+ iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
if (unlikely(slop)) {
- __le32 pad = 0;
- if (write_data) {
- memcpy(&pad, buf + buflen - slop, slop);
- iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
- } else {
+ u32 pad;
+ if (rw == READ) {
pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
memcpy(buf + buflen - slop, &pad, slop);
+ } else {
+ memcpy(&pad, buf + buflen - slop, slop);
+ iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
}
+ buflen += 4 - slop;
}
local_irq_restore(flags);
- }
- else
- ata_data_xfer_noirq(adev, buf, buflen, write_data);
+ } else
+ buflen = ata_data_xfer_noirq(dev, buf, buflen, rw);
+
+ return buflen;
}
static struct ata_port_operations pdc20230_port_ops = {