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libata: update ->data_xfer hook for ATAPI

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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>
This commit is contained in:
Tejun Heo
2007-12-05 16:43:07 +09:00
committed by Jeff Garzik
parent ceb0c64262
commit 55dba3120f
8 changed files with 133 additions and 102 deletions
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36
drivers/ata/pata_legacy.c
View File

@@ -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 = {