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/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/delay.h>
#include <linux/tegra-powergate.h>
#include "powergate-priv.h"
int tegra1xx_powergate(int id, struct powergate_partition_info *pg_info)
{
int ret;
/* If first clk_ptr is null, fill clk info for the partition */
if (!pg_info->clk_info[0].clk_ptr)
get_clk_info(pg_info);
ret = partition_clk_enable(pg_info);
if (ret)
WARN(1, "Couldn't enable clock");
udelay(10);
tegra_powergate_mc_flush(id);
udelay(10);
powergate_partition_assert_reset(pg_info);
udelay(10);
/* Powergating is done only if refcnt of all clks is 0 */
partition_clk_disable(pg_info);
udelay(10);
ret = tegra_powergate_set(id, false);
if (ret)
goto err_power_off;
return 0;
err_power_off:
WARN(1, "Could not Powergate Partition %d", id);
return ret;
}
int tegra1xx_unpowergate(int id, struct powergate_partition_info *pg_info)
{
int ret;
/* If first clk_ptr is null, fill clk info for the partition */
if (!pg_info->clk_info[0].clk_ptr)
get_clk_info(pg_info);
if (tegra_powergate_is_powered(id))
return tegra_powergate_reset_module(pg_info);
ret = tegra_powergate_set(id, true);
if (ret)
goto err_power;
udelay(10);
/* Un-Powergating fails if all clks are not enabled */
ret = partition_clk_enable(pg_info);
if (ret)
goto err_clk_on;
udelay(10);
ret = tegra_powergate_remove_clamping(id);
if (ret)
goto err_clamp;
udelay(10);
powergate_partition_deassert_reset(pg_info);
udelay(10);
tegra_powergate_mc_flush_done(id);
udelay(10);
/* Disable all clks enabled earlier. Drivers should enable clks */
partition_clk_disable(pg_info);
return 0;
err_clamp:
partition_clk_disable(pg_info);
err_clk_on:
powergate_module(id);
err_power:
WARN(1, "Could not Un-Powergate %d", id);
return ret;
}
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