diff options
Diffstat (limited to 'drivers/media/video/omap/omap_voutlib.c')
| -rw-r--r-- | drivers/media/video/omap/omap_voutlib.c | 46 |
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); +} |