diff options
Diffstat (limited to 'drivers/ata/pata_scc.c')
| -rw-r--r-- | drivers/ata/pata_scc.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/drivers/ata/pata_scc.c b/drivers/ata/pata_scc.c index ea2ef9fc15be..55055b27524c 100644 --- a/drivers/ata/pata_scc.c +++ b/drivers/ata/pata_scc.c @@ -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; } /** |