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path: root/drivers/media/video/omap/omap_voutlib.c
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Diffstat (limited to 'drivers/media/video/omap/omap_voutlib.c')
-rw-r--r--drivers/media/video/omap/omap_voutlib.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/media/video/omap/omap_voutlib.c b/drivers/media/video/omap/omap_voutlib.c
index 8ae74817a11..115408b9274 100644
--- a/drivers/media/video/omap/omap_voutlib.c
+++ b/drivers/media/video/omap/omap_voutlib.c
@@ -24,8 +24,12 @@
#include <linux/types.h>
#include <linux/videodev2.h>
+#include <linux/dma-mapping.h>
+
#include <plat/cpu.h>
+#include "omap_voutlib.h"
+
MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("OMAP Video library");
MODULE_LICENSE("GPL");
@@ -291,3 +295,45 @@ void omap_vout_new_format(struct v4l2_pix_format *pix,
}
EXPORT_SYMBOL_GPL(omap_vout_new_format);
+/*
+ * Allocate buffers
+ */
+unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
+{
+ u32 order, size;
+ unsigned long virt_addr, addr;
+
+ size = PAGE_ALIGN(buf_size);
+ order = get_order(size);
+ virt_addr = __get_free_pages(GFP_KERNEL, order);
+ addr = virt_addr;
+
+ if (virt_addr) {
+ while (size > 0) {
+ SetPageReserved(virt_to_page(addr));
+ addr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+ }
+ *phys_addr = (u32) virt_to_phys((void *) virt_addr);
+ return virt_addr;
+}
+
+/*
+ * Free buffers
+ */
+void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
+{
+ u32 order, size;
+ unsigned long addr = virtaddr;
+
+ size = PAGE_ALIGN(buf_size);
+ order = get_order(size);
+
+ while (size > 0) {
+ ClearPageReserved(virt_to_page(addr));
+ addr += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+ free_pages((unsigned long) virtaddr, order);
+}