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/* *
* Copyright (C) 2017 Lucas Stach <l.stach@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <init.h>
#include <io.h>
#include <of.h>
#define MC_VIDEO_PROTECT_SIZE_MB 0x64c
#define MC_VIDEO_PROTECT_REG_CTRL 0x650
#define MC_VIDEO_PROTECT_REG_WR_DIS (1 << 0)
static int tegra124_mc_of_fixup(struct device_node *root, void *context)
{
struct device_node *np;
np = of_find_compatible_node(root, NULL, "nvidia,gk20a");
if (np)
of_device_enable(np);
return 0;
}
static int tegra124_mc_probe(struct device_d *dev)
{
struct resource *iores;
void __iomem *base;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores)) {
dev_err(dev, "could not get memory region\n");
return PTR_ERR(iores);
}
base = IOMEM(iores->start);
/* disable video protect region */
writel(0 , base + MC_VIDEO_PROTECT_SIZE_MB);
writel(MC_VIDEO_PROTECT_REG_WR_DIS, base + MC_VIDEO_PROTECT_REG_CTRL);
readl(base + MC_VIDEO_PROTECT_REG_CTRL); /* readback to flush */
return of_register_fixup(tegra124_mc_of_fixup, NULL);
}
static __maybe_unused struct of_device_id tegra124_mc_dt_ids[] = {
{
.compatible = "nvidia,tegra124-mc",
}, {
/* sentinel */
},
};
static struct driver_d tegra124_mc_driver = {
.name = "tegra124-mc",
.of_compatible = DRV_OF_COMPAT(tegra124_mc_dt_ids),
.probe = tegra124_mc_probe,
};
static int __init tegra124_mc_init(void)
{
return platform_driver_register(&tegra124_mc_driver);
}
device_initcall(tegra124_mc_init);
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