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| author | Tejun Heo <htejun@gmail.com> | 2007-12-05 16:43:07 +0900 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-01-23 05:24:14 -0500 |
| commit | 55dba3120fbcbea6800f9a18503d25f73212a347 (patch) | |
| tree | 1b23e606aad8bc58dbe68ca905c0658625fb176e /drivers/ata/pata_qdi.c | |
| parent | ceb0c642624f634c5b4f46b0e22df19be87a2e53 (diff) | |
| download | lwn-55dba3120fbcbea6800f9a18503d25f73212a347.tar.gz lwn-55dba3120fbcbea6800f9a18503d25f73212a347.zip | |
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_qdi.c')
| -rw-r--r-- | drivers/ata/pata_qdi.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/drivers/ata/pata_qdi.c b/drivers/ata/pata_qdi.c index a4c0e502cb42..9f308ed76cc8 100644 --- a/drivers/ata/pata_qdi.c +++ b/drivers/ata/pata_qdi.c @@ -124,29 +124,33 @@ static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc) return ata_qc_issue_prot(qc); } -static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data) +static unsigned int qdi_data_xfer(struct ata_device *dev, unsigned char *buf, + unsigned int buflen, int rw) { - struct ata_port *ap = adev->link->ap; - int slop = buflen & 3; + if (ata_id_has_dword_io(dev->id)) { + struct ata_port *ap = dev->link->ap; + int slop = buflen & 3; - if (ata_id_has_dword_io(adev->id)) { - 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; } } else - ata_data_xfer(adev, buf, buflen, write_data); + buflen = ata_data_xfer(dev, buf, buflen, rw); + + return buflen; } static struct scsi_host_template qdi_sht = { |