1 /* 2 * linux/drivers/media/video/s5p-mfc/s5p_mfc_shm.c 3 * 4 * Copyright (c) 2010 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 13 #ifdef CONFIG_ARCH_EXYNOS4 14 #include <linux/dma-mapping.h> 15 #endif 16 #include <linux/io.h> 17 #include "s5p_mfc_common.h" 18 #include "s5p_mfc_debug.h" 19 s5p_mfc_init_shm(struct s5p_mfc_ctx * ctx)20int s5p_mfc_init_shm(struct s5p_mfc_ctx *ctx) 21 { 22 struct s5p_mfc_dev *dev = ctx->dev; 23 void *shm_alloc_ctx = dev->alloc_ctx[MFC_BANK1_ALLOC_CTX]; 24 25 ctx->shm_alloc = vb2_dma_contig_memops.alloc(shm_alloc_ctx, 26 SHARED_BUF_SIZE); 27 if (IS_ERR(ctx->shm_alloc)) { 28 mfc_err("failed to allocate shared memory\n"); 29 return PTR_ERR(ctx->shm_alloc); 30 } 31 /* shm_ofs only keeps the offset from base (port a) */ 32 ctx->shm_ofs = s5p_mfc_mem_cookie(shm_alloc_ctx, ctx->shm_alloc) 33 - dev->bank1; 34 BUG_ON(ctx->shm_ofs & ((1 << MFC_BANK1_ALIGN_ORDER) - 1)); 35 ctx->shm = vb2_dma_contig_memops.vaddr(ctx->shm_alloc); 36 if (!ctx->shm) { 37 vb2_dma_contig_memops.put(ctx->shm_alloc); 38 ctx->shm_ofs = 0; 39 ctx->shm_alloc = NULL; 40 mfc_err("failed to virt addr of shared memory\n"); 41 return -ENOMEM; 42 } 43 memset((void *)ctx->shm, 0, SHARED_BUF_SIZE); 44 wmb(); 45 return 0; 46 } 47 48