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/*
* drivers/video/tegra/dc/ext/util.c
*
* Copyright (C) 2011, NVIDIA Corporation
*
* Author: Robert Morell <rmorell@nvidia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/err.h>
#include <linux/types.h>
#include <mach/dc.h>
#include <mach/nvmap.h>
/* ugh */
#include "../../nvmap/nvmap.h"
#include "tegra_dc_ext_priv.h"
int tegra_dc_ext_pin_window(struct tegra_dc_ext_user *user, u32 id,
struct nvmap_handle_ref **handle,
dma_addr_t *phys_addr)
{
struct tegra_dc_ext *ext = user->ext;
struct nvmap_handle_ref *win_dup;
struct nvmap_handle *win_handle;
dma_addr_t phys;
if (!id) {
*handle = NULL;
*phys_addr = -1;
return 0;
}
/*
* Take a reference to the buffer using the user's nvmap context, to
* make sure they have permissions to access it.
*/
win_handle = nvmap_get_handle_id(user->nvmap, id);
if (!win_handle)
return -EACCES;
/*
* Duplicate the buffer's handle into the dc_ext driver's nvmap
* context, to ensure that the handle won't be freed as long as it is
* in use by display.
*/
win_dup = nvmap_duplicate_handle_id(ext->nvmap, id);
/* Release the reference we took in the user's context above */
nvmap_handle_put(win_handle);
if (IS_ERR(win_dup))
return PTR_ERR(win_dup);
phys = nvmap_pin(ext->nvmap, win_dup);
/* XXX this isn't correct for non-pointers... */
if (IS_ERR((void *)phys)) {
nvmap_free(ext->nvmap, win_dup);
return PTR_ERR((void *)phys);
}
*phys_addr = phys;
*handle = win_dup;
return 0;
}
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