drivers/media/video/s5p-mfc/s5p_mfc_shm.c

   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
  20 int 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