Allows the existing 16-bit data transfer function used by the PATA Platform
driver to be overriden by a vendor specific fuction. This is useful if,
for example, the PATA device is only capable of 8-bit data transfers
Signed-off-by: Graeme Russ <graeme.russ@xxxxxxxxx>
---
drivers/ata/pata_platform.c | 7 +++++++
include/linux/ata_platform.h | 5 +++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index 3f6ebc6..dc516b4 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -238,6 +238,13 @@ static int __devinit pata_platform_probe(struct platform_device *pdev)
if (irq_res)
irq_res->flags = pp_info ? pp_info->irq_flags : 0;
+ /*
+ * Assign custom data transfer function (if defined)
+ */
+ if (pp_info)
+ if (unlikely(pp_info->data_xfer))
+ pata_platform_port_ops.sff_data_xfer = pp_info->data_xfer;
+
return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
pp_info ? pp_info->ioport_shift : 0,
pio_mask);
diff --git a/include/linux/ata_platform.h b/include/linux/ata_platform.h
index 9a26c83..0913633 100644
--- a/include/linux/ata_platform.h
+++ b/include/linux/ata_platform.h
@@ -13,6 +13,11 @@ struct pata_platform_info {
* IRQ flags when call request_irq()
*/
unsigned int irq_flags;
+ /*
+ * Custom data transfer function
+ */
+ unsigned int (*data_xfer)(struct ata_device *dev,
+ unsigned char *buf, unsigned int buflen, int rw);
};
extern int __devinit __pata_platform_probe(struct device *dev,
--
1.7.1.rc1.12.ga601
--
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