From 55dba3120fbcbea6800f9a18503d25f73212a347 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 5 Dec 2007 16:43:07 +0900 Subject: 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 Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 46 ++++++++++++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 16 deletions(-) (limited to 'drivers/ata/libata-core.c') diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 2c9745a74d5..39cedd949ed 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4994,7 +4994,7 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words) /** * ata_data_xfer - Transfer data by PIO - * @adev: device to target + * @dev: device to target * @buf: data buffer * @buflen: buffer length * @write_data: read/write @@ -5003,37 +5003,44 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words) * * LOCKING: * Inherited from caller. + * + * RETURNS: + * Bytes consumed. */ -void ata_data_xfer(struct ata_device *adev, unsigned char *buf, - unsigned int buflen, int write_data) +unsigned int ata_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; + void __iomem *data_addr = ap->ioaddr.data_addr; unsigned int words = buflen >> 1; /* Transfer multiple of 2 bytes */ - if (write_data) - iowrite16_rep(ap->ioaddr.data_addr, buf, words); + if (rw == READ) + ioread16_rep(data_addr, buf, words); else - ioread16_rep(ap->ioaddr.data_addr, buf, words); + iowrite16_rep(data_addr, buf, words); /* 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); - iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr); - } else { - align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr)); + if (rw == READ) { + align_buf[0] = cpu_to_le16(ioread16(data_addr)); memcpy(trailing_buf, align_buf, 1); + } else { + memcpy(align_buf, trailing_buf, 1); + iowrite16(le16_to_cpu(align_buf[0]), data_addr); } + words++; } + + return words << 1; } /** * ata_data_xfer_noirq - Transfer data by PIO - * @adev: device to target + * @dev: device to target * @buf: data buffer * @buflen: buffer length * @write_data: read/write @@ -5043,14 +5050,21 @@ void ata_data_xfer(struct ata_device *adev, unsigned char *buf, * * LOCKING: * Inherited from caller. + * + * RETURNS: + * Bytes consumed. */ -void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf, - unsigned int buflen, int write_data) +unsigned int ata_data_xfer_noirq(struct ata_device *dev, unsigned char *buf, + unsigned int buflen, int rw) { unsigned long flags; + unsigned int consumed; + local_irq_save(flags); - ata_data_xfer(adev, buf, buflen, write_data); + consumed = ata_data_xfer(dev, buf, buflen, rw); local_irq_restore(flags); + + return consumed; } -- cgit v1.2.3