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/* exynos_drm_buf.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Author: Inki Dae <inki.dae@samsung.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
#include "drm.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"
static int lowlevel_buffer_allocate(struct drm_device *dev,
struct exynos_drm_gem_buf *buffer)
{
DRM_DEBUG_KMS("%s\n", __FILE__);
buffer->kvaddr = dma_alloc_writecombine(dev->dev, buffer->size,
&buffer->dma_addr, GFP_KERNEL);
if (!buffer->kvaddr) {
DRM_ERROR("failed to allocate buffer.\n");
return -ENOMEM;
}
DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)buffer->kvaddr,
(unsigned long)buffer->dma_addr,
buffer->size);
return 0;
}
static void lowlevel_buffer_deallocate(struct drm_device *dev,
struct exynos_drm_gem_buf *buffer)
{
DRM_DEBUG_KMS("%s.\n", __FILE__);
if (buffer->dma_addr && buffer->size)
dma_free_writecombine(dev->dev, buffer->size, buffer->kvaddr,
(dma_addr_t)buffer->dma_addr);
else
DRM_DEBUG_KMS("buffer data are invalid.\n");
}
struct exynos_drm_gem_buf *exynos_drm_buf_create(struct drm_device *dev,
unsigned int size)
{
struct exynos_drm_gem_buf *buffer;
DRM_DEBUG_KMS("%s.\n", __FILE__);
DRM_DEBUG_KMS("desired size = 0x%x\n", size);
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
if (!buffer) {
DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
return ERR_PTR(-ENOMEM);
}
buffer->size = size;
/*
* allocate memory region with size and set the memory information
* to vaddr and dma_addr of a buffer object.
*/
if (lowlevel_buffer_allocate(dev, buffer) < 0) {
kfree(buffer);
buffer = NULL;
return ERR_PTR(-ENOMEM);
}
return buffer;
}
void exynos_drm_buf_destroy(struct drm_device *dev,
struct exynos_drm_gem_buf *buffer)
{
DRM_DEBUG_KMS("%s.\n", __FILE__);
if (!buffer) {
DRM_DEBUG_KMS("buffer is null.\n");
return;
}
lowlevel_buffer_deallocate(dev, buffer);
kfree(buffer);
buffer = NULL;
}
MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
MODULE_LICENSE("GPL");
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