diff options
Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_buf.c')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_buf.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c b/drivers/gpu/drm/exynos/exynos_drm_buf.c new file mode 100644 index 000000000000..2bb07bca511a --- /dev/null +++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c @@ -0,0 +1,112 @@ +/* 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"); |