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

#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

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;