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Platform: goldfish: goldfish_pipe.c: Add DMA support using managed version

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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>
This commit is contained in:
Shraddha Barke 2016-02-12 16:11:54 +05:30 committed by Greg Kroah-Hartman
parent 288f152cad
commit 1d427da1d7
1 changed files with 7 additions and 7 deletions
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14
drivers/platform/goldfish/goldfish_pipe.c
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@ -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 valid_batchbuffer_addr(struct goldfish_pipe_dev *dev,
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;