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/* exynos_drm_ump.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 <drm/exynos_drm.h>
#include "exynos_drm_gem.h"
#include "ump_kernel_interface_ref_drv.h"
static unsigned int exynos_drm_ump_get_handle(unsigned int id)
{
return (unsigned int)ump_dd_handle_get((ump_secure_id)id);
}
static int exynos_drm_ump_add_buffer(void *obj,
unsigned int *handle, unsigned int *id)
{
struct exynos_drm_gem_obj *gem_obj = obj;
struct exynos_drm_gem_buf *buf = gem_obj->buffer;
ump_dd_physical_block *ump_mem_desc;
unsigned int nblocks;
DRM_DEBUG_KMS("%s\n", __FILE__);
if (IS_NONCONTIG_BUFFER(gem_obj->flags)) {
unsigned int i = 0;
if (!buf->pages)
return -EFAULT;
nblocks = gem_obj->size >> PAGE_SHIFT;
ump_mem_desc = kzalloc(sizeof(*ump_mem_desc) * nblocks,
GFP_KERNEL);
if (!ump_mem_desc) {
DRM_ERROR("failed to alloc ump_mem_desc.\n");
return -ENOMEM;
}
/*
* if EXYNOS_BO_NONCONTIG type, gem object would already
* have pages allocated by gem creation so contain page
* frame numbers of all pages into ump descriptors.
*/
while (i < nblocks) {
ump_mem_desc[i].addr =
page_to_pfn(buf->pages[i]) << PAGE_SHIFT;
ump_mem_desc[i].size = PAGE_SIZE;
i++;
}
} else {
nblocks = 1;
ump_mem_desc = kzalloc(sizeof(*ump_mem_desc), GFP_KERNEL);
if (!ump_mem_desc) {
DRM_ERROR("failed to alloc ump_mem_desc.\n");
return -ENOMEM;
}
/*
* it EXYNOS_DRM_GEM_PC type, gem would have just one
* physically continuous buffer so let a ump descriptor
* have one buffer address.
*/
ump_mem_desc[0].addr = (unsigned long)buf->paddr;
ump_mem_desc[0].size = buf->size;
}
/*
* register memory information to ump descriptor table through
* the ump descriptor data and then return ump handle to it so that
* user can access the memory region through it.
*/
*handle = (unsigned int)
ump_dd_handle_create_from_phys_blocks(ump_mem_desc, nblocks);
if (!(*handle)) {
DRM_ERROR("failed to create ump handle.\n");
kfree(ump_mem_desc);
return -EINVAL;
}
*id = ump_dd_secure_id_get((ump_dd_handle)*handle);
kfree(ump_mem_desc);
DRM_DEBUG_KMS("ump handle : 0x%x, secure id = %d\n", *handle, *id);
DRM_INFO("ump handle : 0x%x, secure id = %d\n", *handle, *id);
return 0;
}
static void exynos_drm_ump_release_buffer(unsigned int handle)
{
DRM_DEBUG_KMS("%s\n", __FILE__);
}
static struct exynos_drm_private_cb ump_callback = {
.get_handle = exynos_drm_ump_get_handle,
.add_buffer = exynos_drm_ump_add_buffer,
.release_buffer = exynos_drm_ump_release_buffer,
};
static int exynos_drm_ump_init(void)
{
DRM_DEBUG_KMS("%s\n", __FILE__);
exynos_drm_priv_cb_register(&ump_callback);
return 0;
}
static void exynos_drm_ump_exit(void)
{
}
subsys_initcall(exynos_drm_ump_init);
module_exit(exynos_drm_ump_exit);
MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM UMP Backend Module");
MODULE_LICENSE("GPL");
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