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/*
* Support Power Management feature
*
* Copyright 2014 Freescale Semiconductor Inc.
*
* Author: Chenhui Zhao <chenhui.zhao@freescale.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/of_platform.h>
#include <asm/fsl_pm.h>
#define FSL_SLEEP 0x1
#define FSL_DEEP_SLEEP 0x2
int (*fsl_enter_deepsleep)(void);
/* specify the sleep state of the present platform */
unsigned int sleep_pm_state;
/* supported sleep modes by the present platform */
static unsigned int sleep_modes;
static int qoriq_suspend_enter(suspend_state_t state)
{
int ret = 0;
int cpu;
switch (state) {
case PM_SUSPEND_STANDBY:
if (cur_cpu_spec->cpu_flush_caches)
cur_cpu_spec->cpu_flush_caches();
ret = qoriq_pm_ops->plat_enter_state(sleep_pm_state);
break;
case PM_SUSPEND_MEM:
cpu = smp_processor_id();
qoriq_pm_ops->irq_mask(cpu);
ret = fsl_enter_deepsleep();
qoriq_pm_ops->irq_unmask(cpu);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int qoriq_suspend_valid(suspend_state_t state)
{
if (state == PM_SUSPEND_STANDBY && (sleep_modes & FSL_SLEEP))
return 1;
if (state == PM_SUSPEND_MEM && (sleep_modes & FSL_DEEP_SLEEP))
return 1;
return 0;
}
static int qoriq_suspend_begin(suspend_state_t state)
{
if (state == PM_SUSPEND_MEM)
return fsl_dp_iomap();
return 0;
}
static void qoriq_suspend_end(void)
{
fsl_dp_iounmap();
}
static const struct platform_suspend_ops qoriq_suspend_ops = {
.valid = qoriq_suspend_valid,
.enter = qoriq_suspend_enter,
.begin = qoriq_suspend_begin,
.end = qoriq_suspend_end,
};
static int __init qoriq_suspend_init(void)
{
struct device_node *np;
sleep_modes = FSL_SLEEP;
sleep_pm_state = PLAT_PM_SLEEP;
np = of_find_compatible_node(NULL, NULL, "fsl,qoriq-rcpm-2.0");
if (np)
sleep_pm_state = PLAT_PM_LPM20;
np = of_find_compatible_node(NULL, NULL, "fsl,t1040-rcpm");
if (np) {
fsl_enter_deepsleep = fsl_enter_epu_deepsleep;
sleep_modes |= FSL_DEEP_SLEEP;
}
suspend_set_ops(&qoriq_suspend_ops);
return 0;
}
arch_initcall(qoriq_suspend_init);
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