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| author | Tejun Heo <htejun@gmail.com> | 2007-12-05 10:43:07 +0300 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-01-23 13:24:14 +0300 |
| commit | 55dba3120fbcbea6800f9a18503d25f73212a347 (patch) | |
| tree | 1b23e606aad8bc58dbe68ca905c0658625fb176e /drivers/ata/pata_ixp4xx_cf.c | |
| parent | ceb0c642624f634c5b4f46b0e22df19be87a2e53 (diff) | |
| download | linux-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_ixp4xx_cf.c')
| -rw-r--r-- | drivers/ata/pata_ixp4xx_cf.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c index 120b5bfa7ce6..030878fedeb5 100644 --- a/drivers/ata/pata_ixp4xx_cf.c +++ b/drivers/ata/pata_ixp4xx_cf.c @@ -42,13 +42,13 @@ static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error) return 0; } -static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, - unsigned int buflen, int write_data) +static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev, + unsigned char *buf, unsigned int buflen, int rw) { unsigned int i; unsigned int words = buflen >> 1; u16 *buf16 = (u16 *) buf; - struct ata_port *ap = adev->link->ap; + struct ata_port *ap = dev->link->ap; void __iomem *mmio = ap->ioaddr.data_addr; struct ixp4xx_pata_data *data = ap->host->dev->platform_data; @@ -59,30 +59,32 @@ static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, udelay(100); /* Transfer multiple of 2 bytes */ - if (write_data) { - for (i = 0; i < words; i++) - writew(buf16[i], mmio); - } else { + if (rw == READ) for (i = 0; i < words; i++) buf16[i] = readw(mmio); - } + else + for (i = 0; i < words; i++) + writew(buf16[i], mmio); /* 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); - writew(align_buf[0], mmio); - } else { + if (rw == READ) { align_buf[0] = readw(mmio); memcpy(trailing_buf, align_buf, 1); + } else { + memcpy(align_buf, trailing_buf, 1); + writew(align_buf[0], mmio); } + words++; } udelay(100); *data->cs0_cfg |= 0x01; + + return words << 1; } static struct scsi_host_template ixp4xx_sht = { |