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