[media] st-delta: add memory allocator helper functions

Helper functions used by decoder back-ends to allocate
physically contiguous memory required by hardware video
decoder.

Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

4 files changed, 74 insertions, 1 deletions

diff --git a/drivers/media/platform/sti/delta/Makefile b/drivers/media/platform/sti/delta/Makefile
index 467519e12ba5..93a3037c29b9 100644
--- a/drivers/media/platform/sti/delta/Makefile
+++ b/drivers/media/platform/sti/delta/Makefile
@@ -1,2 +1,2 @@
 obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o
-st-delta-y := delta-v4l2.o
+st-delta-y := delta-v4l2.o delta-mem.o
diff --git a/drivers/media/platform/sti/delta/delta-mem.c b/drivers/media/platform/sti/delta/delta-mem.c
new file mode 100644
index 000000000000..d7b53d31caa6
--- /dev/null
+++ b/drivers/media/platform/sti/delta/delta-mem.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include "delta.h"
+#include "delta-mem.h"
+
+int hw_alloc(struct delta_ctx *ctx, u32 size, const char *name,
+             struct delta_buf *buf)
+{
+        struct delta_dev *delta = ctx->dev;
+        dma_addr_t dma_addr;
+        void *addr;
+        unsigned long attrs = DMA_ATTR_WRITE_COMBINE;
+
+        addr = dma_alloc_attrs(delta->dev, size, &dma_addr,
+                               GFP_KERNEL | __GFP_NOWARN, attrs);
+        if (!addr) {
+                dev_err(delta->dev,
+                        "%s hw_alloc:dma_alloc_coherent failed for %s (size=%d)\n",
+                        ctx->name, name, size);
+                ctx->sys_errors++;
+                return -ENOMEM;
+        }
+
+        buf->size = size;
+        buf->paddr = dma_addr;
+        buf->vaddr = addr;
+        buf->name = name;
+        buf->attrs = attrs;
+
+        dev_dbg(delta->dev,
+                "%s allocate %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",
+                ctx->name, size, buf->vaddr, &buf->paddr, buf->name);
+
+        return 0;
+}
+
+void hw_free(struct delta_ctx *ctx, struct delta_buf *buf)
+{
+        struct delta_dev *delta = ctx->dev;
+
+        dev_dbg(delta->dev,
+                "%s     free %d bytes of HW memory @(virt=0x%p, phy=0x%pad): %s\n",
+                ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
+
+        dma_free_attrs(delta->dev, buf->size,
+                       buf->vaddr, buf->paddr, buf->attrs);
+}
diff --git a/drivers/media/platform/sti/delta/delta-mem.h b/drivers/media/platform/sti/delta/delta-mem.h
new file mode 100644
index 000000000000..f8ca109e1241
--- /dev/null
+++ b/drivers/media/platform/sti/delta/delta-mem.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Author: Hugues Fruchet <hugues.fruchet@st.com> for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef DELTA_MEM_H
+#define DELTA_MEM_H
+
+int hw_alloc(struct delta_ctx *ctx, u32 size, const char *name,
+             struct delta_buf *buf);
+void hw_free(struct delta_ctx *ctx, struct delta_buf *buf);
+
+#endif /* DELTA_MEM_H */
diff --git a/drivers/media/platform/sti/delta/delta.h b/drivers/media/platform/sti/delta/delta.h
index 74a42404bc50..9e265255e30a 100644
--- a/drivers/media/platform/sti/delta/delta.h
+++ b/drivers/media/platform/sti/delta/delta.h
@@ -191,6 +191,14 @@ struct delta_dts {
         u64 val;
 };
 
+struct delta_buf {
+        u32 size;
+        void *vaddr;
+        dma_addr_t paddr;
+        const char *name;
+        unsigned long attrs;
+};
+
 struct delta_ctx;
 
 /*