[media] st-delta: add memory allocator helper functions

obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o

st-delta-y := delta-v4l2.o

st-delta-y := delta-v4l2.o delta-mem.o

/*

 * Copyright (C) STMicroelectronics SA 2015

 * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.

 * License terms:  GNU General Public License (GPL), version 2

 */

#include "delta.h"

#include "delta-mem.h"

int hw_alloc(struct delta_ctx *ctx, u32 size, const char *name,

	     struct delta_buf *buf)

{

	struct delta_dev *delta = ctx->dev;

	dma_addr_t dma_addr;

	void *addr;

	unsigned long attrs = DMA_ATTR_WRITE_COMBINE;

	addr = dma_alloc_attrs(delta->dev, size, &dma_addr,

			       GFP_KERNEL | __GFP_NOWARN, attrs);

	if (!addr) {

		dev_err(delta->dev,

			"%s hw_alloc:dma_alloc_coherent failed for %s (size=%d)\n",

			ctx->name, name, size);

		ctx->sys_errors++;

		return -ENOMEM;

	}

	buf->size = size;

	buf->paddr = dma_addr;

	buf->vaddr = addr;

	buf->name = name;

	buf->attrs = attrs;

	dev_dbg(delta->dev,

		"%s allocate %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",

		ctx->name, size, buf->vaddr, &buf->paddr, buf->name);

	return 0;

}

void hw_free(struct delta_ctx *ctx, struct delta_buf *buf)

{

	struct delta_dev *delta = ctx->dev;

	dev_dbg(delta->dev,

		"%s     free %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",

		ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);

	dma_free_attrs(delta->dev, buf->size,

		       buf->vaddr, buf->paddr, buf->attrs);

}

/*

 * Copyright (C) STMicroelectronics SA 2015

 * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.

 * License terms:  GNU General Public License (GPL), version 2

 */

#ifndef DELTA_MEM_H

#define DELTA_MEM_H

int hw_alloc(struct delta_ctx *ctx, u32 size, const char *name,

	     struct delta_buf *buf);

void hw_free(struct delta_ctx *ctx, struct delta_buf *buf);

#endif /* DELTA_MEM_H */

	u64 val;

};

struct delta_buf {

	u32 size;

	void *vaddr;

	dma_addr_t paddr;

	const char *name;

	unsigned long attrs;

};

struct delta_ctx;

/*