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path: root/drivers/media/video/s5p-mfc/s5p_mfc_shm.c
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Diffstat (limited to 'drivers/media/video/s5p-mfc/s5p_mfc_shm.c')
-rw-r--r--drivers/media/video/s5p-mfc/s5p_mfc_shm.c47
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;
+}
+