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

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Helper functions used by decoder back-ends to allocate
physically contiguous memory required by hardware video
decoder.

Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hugues Fruchet 2017-02-02 12:59:49 -02:00 committed by Mauro Carvalho Chehab
parent f386509e49
commit c502e58350
4 changed files with 74 additions and 1 deletions
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2
drivers/media/platform/sti/delta/Makefile
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@ -1,2 +1,2 @@
obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o
st-delta-y := delta-v4l2.o
st-delta-y := delta-v4l2.o delta-mem.o

51
drivers/media/platform/sti/delta/delta-mem.c Normal file
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@ -0,0 +1,51 @@
/*
* 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);
}

14
drivers/media/platform/sti/delta/delta-mem.h Normal file
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@ -0,0 +1,14 @@
/*
* 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 */

8
drivers/media/platform/sti/delta/delta.h
View File

@ -191,6 +191,14 @@ struct delta_dts {
u64 val;
};
struct delta_buf {
u32 size;
void *vaddr;
dma_addr_t paddr;
const char *name;
unsigned long attrs;
};
struct delta_ctx;
/*