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