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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 tegraxx_powergate_partition(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);
powergate_partition_assert_reset(pg_info);
/* Powergating is done only if refcnt of all clks is 0 */
ret = is_partition_clk_disabled(pg_info);
if (ret)
goto err_clk_off;
ret = powergate_module(id);
if (ret)
goto err_power_off;
return 0;
err_power_off:
WARN(1, "Could not Powergate Partition %d", id);
err_clk_off:
WARN(1, "Could not Powergate Partition %d, all clks not disabled", id);
return ret;
}
int tegraxx_unpowergate_partition(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 = unpowergate_module(id);
if (ret)
goto err_power;
powergate_partition_assert_reset(pg_info);
/* 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);
tegra_powergate_mc_flush_done(id);
/* 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;
}
int tegraxx_powergate_partition_with_clk_off(int id,
struct powergate_partition_info *pg_info)
{
int ret = 0;
/* Disable clks for the partition */
partition_clk_disable(pg_info);
ret = is_partition_clk_disabled(pg_info);
if (ret)
goto err_powergate_clk;
ret = tegra_powergate_partition(id);
if (ret)
goto err_powergating;
return ret;
err_powergate_clk:
WARN(1, "Could not Powergate Partition %d, all clks not disabled", id);
err_powergating:
ret = partition_clk_enable(pg_info);
if (ret)
return ret;
WARN(1, "Could not Powergate Partition %d", id);
return ret;
}
int tegraxx_unpowergate_partition_with_clk_on(int id,
struct powergate_partition_info *pg_info)
{
int ret = 0;
ret = tegra_unpowergate_partition(id);
if (ret)
goto err_unpowergating;
/* Enable clks for the partition */
ret = partition_clk_enable(pg_info);
if (ret)
goto err_unpowergate_clk;
return ret;
err_unpowergate_clk:
tegra_powergate_partition(id);
WARN(1, "Could not Un-Powergate %d, err in enabling clk", id);
err_unpowergating:
WARN(1, "Could not Un-Powergate %d", id);
return ret;
}
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