Platform: goldfish: goldfish_pipe.c: Add DMA support using managed version
Coherent mapping guarantees that the device and CPU are in sync.
Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index e7a29e2..9f6734c 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -57,6 +57,7 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/goldfish.h>
+#include <linux/dma-mapping.h>
/*
* IMPORTANT: The following constants must match the ones used and defined
@@ -217,17 +218,16 @@
static int setup_access_params_addr(struct platform_device *pdev,
struct goldfish_pipe_dev *dev)
{
- u64 paddr;
+ dma_addr_t dma_handle;
struct access_params *aps;
- aps = devm_kzalloc(&pdev->dev, sizeof(struct access_params), GFP_KERNEL);
+ aps = dmam_alloc_coherent(&pdev->dev, sizeof(struct access_params),
+ &dma_handle, GFP_KERNEL);
if (!aps)
- return -1;
+ return -ENOMEM;
- /* FIXME */
- paddr = __pa(aps);
- writel((u32)(paddr >> 32), dev->base + PIPE_REG_PARAMS_ADDR_HIGH);
- writel((u32)paddr, dev->base + PIPE_REG_PARAMS_ADDR_LOW);
+ writel(upper_32_bits(dma_handle), dev->base + PIPE_REG_PARAMS_ADDR_HIGH);
+ writel(lower_32_bits(dma_handle), dev->base + PIPE_REG_PARAMS_ADDR_LOW);
if (valid_batchbuffer_addr(dev, aps)) {
dev->aps = aps;