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/*
* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
*
* 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 <linux/cpu.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/tegra-pm.h>
static u32 shutdown_state;
#define SMC_PM_FUNC 0xC2FFFE00
#define SMC_SET_SHUTDOWN_MODE 0x1
#define SYSTEM_SHUTDOWN_STATE_FULL_POWER_OFF 0
#define SYSTEM_SHUTDOWN_STATE_SC8 8
#define SMC_GET_CLK_COUNT 0x2
/**
* Specify state for SYSTEM_SHUTDOWN
*
* @shutdown_state: Specific shutdown state to set
*
*/
static int tegra_set_shutdown_mode(u32 shutdown_state)
{
struct pm_regs regs;
u32 smc_func = SMC_PM_FUNC | (SMC_SET_SHUTDOWN_MODE & SMC_ENUM_MAX);
regs.args[0] = shutdown_state;
return send_smc(smc_func, ®s);
}
EXPORT_SYMBOL(tegra_set_shutdown_mode);
/**
* read core clk and ref clk counters under EL3
*
* @mpidr: MPIDR of target core
* @midr: MIDR of target core
* @coreclk: core clk counter
* @refclk : ref clk counter
*
* Returns 0 if success.
*/
int tegra_get_clk_counter(u32 mpidr, u32 midr, u32 *coreclk,
u32 *refclk)
{
struct pm_regs regs;
int ret;
u32 smc_func = SMC_PM_FUNC | (SMC_GET_CLK_COUNT & SMC_ENUM_MAX);
regs.args[0] = mpidr;
regs.args[1] = midr;
ret = send_smc(smc_func, ®s);
*coreclk = (u32)regs.args[1];
*refclk = (u32)regs.args[2];
return ret;
}
EXPORT_SYMBOL(tegra_get_clk_counter);
static void tegra186_power_off_prepare(void)
{
disable_nonboot_cpus();
}
static int __init tegra186_pm_init(void)
{
pm_power_off_prepare = tegra186_power_off_prepare;
return 0;
}
core_initcall(tegra186_pm_init);
static int shutdown_state_get(void *data, u64 *val)
{
*val = shutdown_state;
return 0;
}
static int shutdown_state_set(void *data, u64 val)
{
int ret;
if (val == SYSTEM_SHUTDOWN_STATE_FULL_POWER_OFF ||
val == SYSTEM_SHUTDOWN_STATE_SC8) {
shutdown_state = val;
ret = tegra_set_shutdown_mode(shutdown_state);
}
else {
printk("Invalid Shutdown state\n");
ret = -1;
}
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(shutdown_state_fops, shutdown_state_get, shutdown_state_set, "%llu\n");
static int __init tegra18_suspend_debugfs_init(void)
{
struct dentry *dfs_file, *system_state_debugfs;
system_state_debugfs = return_system_states_dir();
if (!system_state_debugfs)
goto err_out;
dfs_file = debugfs_create_file("shutdown", 0644,
system_state_debugfs, NULL, &shutdown_state_fops);
if (!dfs_file)
goto err_out;
return 0;
err_out:
pr_err("%s: Couldn't create debugfs node for shutdown\n", __func__);
return -ENOMEM;
}
module_init(tegra18_suspend_debugfs_init);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Tegra T18x Suspend Mode debugfs");
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