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/*
* linux/drivers/media/platform/s5p-mfc/s5p_mfc_shm.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifdef CONFIG_ARCH_EXYNOS4
#include <linux/dma-mapping.h>
#endif
#include <linux/io.h>
#include "s5p_mfc_common.h"
#include "s5p_mfc_debug.h"
int s5p_mfc_init_shm(struct s5p_mfc_ctx *ctx)
{
struct s5p_mfc_dev *dev = ctx->dev;
void *shm_alloc_ctx = dev->alloc_ctx[MFC_BANK1_ALLOC_CTX];
ctx->shm_alloc = vb2_dma_contig_memops.alloc(shm_alloc_ctx,
SHARED_BUF_SIZE);
if (IS_ERR(ctx->shm_alloc)) {
mfc_err("failed to allocate shared memory\n");
return PTR_ERR(ctx->shm_alloc);
}
/* shm_ofs only keeps the offset from base (port a) */
ctx->shm_ofs = s5p_mfc_mem_cookie(shm_alloc_ctx, ctx->shm_alloc)
- dev->bank1;
BUG_ON(ctx->shm_ofs & ((1 << MFC_BANK1_ALIGN_ORDER) - 1));
ctx->shm = vb2_dma_contig_memops.vaddr(ctx->shm_alloc);
if (!ctx->shm) {
vb2_dma_contig_memops.put(ctx->shm_alloc);
ctx->shm_ofs = 0;
ctx->shm_alloc = NULL;
mfc_err("failed to virt addr of shared memory\n");
return -ENOMEM;
}
memset((void *)ctx->shm, 0, SHARED_BUF_SIZE);
wmb();
return 0;
}
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