diff options
Diffstat (limited to 'drivers/media/video/s5p-mfc/s5p_mfc_shm.c')
| -rw-r--r-- | drivers/media/video/s5p-mfc/s5p_mfc_shm.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/media/video/s5p-mfc/s5p_mfc_shm.c b/drivers/media/video/s5p-mfc/s5p_mfc_shm.c new file mode 100644 index 00000000000..91fdbac8c37 --- /dev/null +++ b/drivers/media/video/s5p-mfc/s5p_mfc_shm.c @@ -0,0 +1,47 @@ +/* + * linux/drivers/media/video/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; +} + |