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staging: xillybus: Open Firmware driver supporting coherent DMA

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If the "dma-coherent" property is present in the device tree, the driver will
not perform cache invalidations. This feature significantly improves data
throughput and reduces CPU load.

Signed-off-by: Eli Billauer <eli.billauer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eli Billauer 2013-12-30 23:16:25 +02:00 committed by Greg Kroah-Hartman
parent 24b33c909e
commit cc212550ee
1 changed files with 20 additions and 1 deletions
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21
drivers/staging/xillybus/xillybus_of.c
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@ -54,6 +54,13 @@ static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
}
static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
dma_addr_t dma_handle,
size_t size,
int direction)
{
}
static dma_addr_t xilly_map_single_of(struct xilly_cleanup *mem,
struct xilly_endpoint *ep,
void *ptr,
@ -102,14 +109,26 @@ static struct xilly_endpoint_hardware of_hw = {
.unmap_single = xilly_unmap_single_of
};
static struct xilly_endpoint_hardware of_hw_coherent = {
.owner = THIS_MODULE,
.hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
.hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
.map_single = xilly_map_single_of,
.unmap_single = xilly_unmap_single_of
};
static int xilly_drv_probe(struct platform_device *op)
{
struct device *dev = &op->dev;
struct xilly_endpoint *endpoint;
int rc = 0;
int irq;
struct xilly_endpoint_hardware *ephw = &of_hw;
endpoint = xillybus_init_endpoint(NULL, dev, &of_hw);
if (of_property_read_bool(dev->of_node, "dma-coherent"))
ephw = &of_hw_coherent;
endpoint = xillybus_init_endpoint(NULL, dev, ephw);
if (!endpoint)
return -ENOMEM;