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/*
* CPU complex suspend & resume functions for Tegra SoCs
*
* Copyright (c) 2009-2012, 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/kernel.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/cpu_pm.h>
#include <linux/suspend.h>
#include <linux/err.h>
#include <linux/clk/tegra.h>
#include <asm/smp_plat.h>
#include <asm/cacheflush.h>
#include <asm/suspend.h>
#include <asm/idmap.h>
#include <asm/proc-fns.h>
#include <asm/tlbflush.h>
#include "iomap.h"
#include "reset.h"
#include "flowctrl.h"
#include "fuse.h"
#include "pmc.h"
#include "sleep.h"
#ifdef CONFIG_PM_SLEEP
static DEFINE_SPINLOCK(tegra_lp2_lock);
void (*tegra_tear_down_cpu)(void);
/*
* restore_cpu_complex
*
* restores cpu clock setting, clears flow controller
*
* Always called on CPU 0.
*/
static void restore_cpu_complex(void)
{
int cpu = smp_processor_id();
BUG_ON(cpu != 0);
#ifdef CONFIG_SMP
cpu = cpu_logical_map(cpu);
#endif
/* Restore the CPU clock settings */
tegra_cpu_clock_resume();
flowctrl_cpu_suspend_exit(cpu);
}
/*
* suspend_cpu_complex
*
* saves pll state for use by restart_plls, prepares flow controller for
* transition to suspend state
*
* Must always be called on cpu 0.
*/
static void suspend_cpu_complex(void)
{
int cpu = smp_processor_id();
BUG_ON(cpu != 0);
#ifdef CONFIG_SMP
cpu = cpu_logical_map(cpu);
#endif
/* Save the CPU clock settings */
tegra_cpu_clock_suspend();
flowctrl_cpu_suspend_enter(cpu);
}
void tegra_clear_cpu_in_lp2(int phy_cpu_id)
{
u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
spin_lock(&tegra_lp2_lock);
BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id)));
*cpu_in_lp2 &= ~BIT(phy_cpu_id);
spin_unlock(&tegra_lp2_lock);
}
bool tegra_set_cpu_in_lp2(int phy_cpu_id)
{
bool last_cpu = false;
cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
spin_lock(&tegra_lp2_lock);
BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
*cpu_in_lp2 |= BIT(phy_cpu_id);
if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
last_cpu = true;
else if (tegra_chip_id == TEGRA20 && phy_cpu_id == 1)
tegra20_cpu_set_resettable_soon();
spin_unlock(&tegra_lp2_lock);
return last_cpu;
}
static int tegra_sleep_cpu(unsigned long v2p)
{
/* Switch to the identity mapping. */
cpu_switch_mm(idmap_pgd, &init_mm);
/* Flush the TLB. */
local_flush_tlb_all();
tegra_sleep_cpu_finish(v2p);
/* should never here */
BUG();
return 0;
}
void tegra_idle_lp2_last(void)
{
tegra_pmc_pm_set(TEGRA_SUSPEND_LP2);
cpu_cluster_pm_enter();
suspend_cpu_complex();
cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
restore_cpu_complex();
cpu_cluster_pm_exit();
}
enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
enum tegra_suspend_mode mode)
{
/* Tegra114 didn't support any suspending mode yet. */
if (tegra_chip_id == TEGRA114)
return TEGRA_SUSPEND_NONE;
/*
* The Tegra devices only support suspending to LP2 currently.
*/
if (mode > TEGRA_SUSPEND_LP2)
return TEGRA_SUSPEND_LP2;
return mode;
}
static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
[TEGRA_SUSPEND_NONE] = "none",
[TEGRA_SUSPEND_LP2] = "LP2",
[TEGRA_SUSPEND_LP1] = "LP1",
[TEGRA_SUSPEND_LP0] = "LP0",
};
static int __cpuinit tegra_suspend_enter(suspend_state_t state)
{
enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
if (WARN_ON(mode < TEGRA_SUSPEND_NONE ||
mode >= TEGRA_MAX_SUSPEND_MODE))
return -EINVAL;
pr_info("Entering suspend state %s\n", lp_state[mode]);
tegra_pmc_pm_set(mode);
local_fiq_disable();
suspend_cpu_complex();
switch (mode) {
case TEGRA_SUSPEND_LP2:
tegra_set_cpu_in_lp2(0);
break;
default:
break;
}
cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
switch (mode) {
case TEGRA_SUSPEND_LP2:
tegra_clear_cpu_in_lp2(0);
break;
default:
break;
}
restore_cpu_complex();
local_fiq_enable();
return 0;
}
static const struct platform_suspend_ops tegra_suspend_ops = {
.valid = suspend_valid_only_mem,
.enter = tegra_suspend_enter,
};
void __init tegra_init_suspend(void)
{
if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NONE)
return;
tegra_pmc_suspend_init();
suspend_set_ops(&tegra_suspend_ops);
}
#endif
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