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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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30
drivers/ata/pata_scc.c
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@@ -768,45 +768,47 @@ static u8 scc_bmdma_status (struct ata_port *ap)
/**
* scc_data_xfer - Transfer data by PIO
* @adev: device for this I/O
* @dev: device for this I/O
* @buf: data buffer
* @buflen: buffer length
* @write_data: read/write
* @rw: read/write
*
* Note: Original code is ata_data_xfer().
*/
static void scc_data_xfer (struct ata_device *adev, unsigned char *buf,
unsigned int buflen, int write_data)
static unsigned int scc_data_xfer (struct ata_device *dev, unsigned char *buf,
unsigned int buflen, int rw)
{
struct ata_port *ap = adev->link->ap;
struct ata_port *ap = dev->link->ap;
unsigned int words = buflen >> 1;
unsigned int i;
u16 *buf16 = (u16 *) buf;
void __iomem *mmio = ap->ioaddr.data_addr;
/* Transfer multiple of 2 bytes */
if (write_data) {
for (i = 0; i < words; i++)
out_be32(mmio, cpu_to_le16(buf16[i]));
} else {
if (rw == READ)
for (i = 0; i < words; i++)
buf16[i] = le16_to_cpu(in_be32(mmio));
}
else
for (i = 0; i < words; i++)
out_be32(mmio, cpu_to_le16(buf16[i]));
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
u16 align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
if (write_data) {
memcpy(align_buf, trailing_buf, 1);
out_be32(mmio, cpu_to_le16(align_buf[0]));
} else {
if (rw == READ) {
align_buf[0] = le16_to_cpu(in_be32(mmio));
memcpy(trailing_buf, align_buf, 1);
} else {
memcpy(align_buf, trailing_buf, 1);
out_be32(mmio, cpu_to_le16(align_buf[0]));
}
words++;
}
return words << 1;
}
/**