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/*
* Copyright (C) ST-Ericsson SA 2011
*
* Author: Rabin Vincent <rabin.vincent@stericsson> for ST-Ericsson
*
* Based on:
* Runtime PM support code for SuperH Mobile ARM
* Copyright (C) 2009-2010 Magnus Damm
*
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include <plat/pincfg.h>
#include <mach/regulator.h>
#include "../pins.h"
#ifdef CONFIG_PM_RUNTIME
#define BIT_ONCE 0
#define BIT_ACTIVE 1
#define BIT_ENABLED 2
struct pm_runtime_data {
unsigned long flags;
struct ux500_regulator *regulator;
struct ux500_pins *pins;
};
static void __devres_release(struct device *dev, void *res)
{
struct pm_runtime_data *prd = res;
dev_dbg(dev, "__devres_release()\n");
if (test_bit(BIT_ENABLED, &prd->flags)) {
if (prd->pins)
ux500_pins_disable(prd->pins);
if (prd->regulator)
ux500_regulator_atomic_disable(prd->regulator);
}
if (test_bit(BIT_ACTIVE, &prd->flags)) {
if (prd->pins)
ux500_pins_put(prd->pins);
if (prd->regulator)
ux500_regulator_put(prd->regulator);
}
}
static struct pm_runtime_data *__to_prd(struct device *dev)
{
return devres_find(dev, __devres_release, NULL, NULL);
}
static void platform_pm_runtime_init(struct device *dev,
struct pm_runtime_data *prd)
{
prd->pins = ux500_pins_get(dev_name(dev));
prd->regulator = ux500_regulator_get(dev);
if (IS_ERR(prd->regulator))
prd->regulator = NULL;
if (prd->pins || prd->regulator) {
dev_info(dev, "managed by runtime pm: %s%s\n",
prd->pins ? "pins " : "",
prd->regulator ? "regulator " : "");
set_bit(BIT_ACTIVE, &prd->flags);
}
}
static void platform_pm_runtime_bug(struct device *dev,
struct pm_runtime_data *prd)
{
if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags))
dev_err(dev, "runtime pm suspend before resume\n");
}
static void platform_pm_runtime_used(struct device *dev,
struct pm_runtime_data *prd)
{
if (prd)
set_bit(BIT_ONCE, &prd->flags);
}
static int ux500_pd_runtime_idle(struct device *dev)
{
return pm_runtime_suspend(dev);
}
static int ux500_pd_runtime_suspend(struct device *dev)
{
struct pm_runtime_data *prd = __to_prd(dev);
dev_vdbg(dev, "%s()\n", __func__);
platform_pm_runtime_bug(dev, prd);
if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
if (prd->pins)
ux500_pins_disable(prd->pins);
if (prd->regulator)
ux500_regulator_atomic_disable(prd->regulator);
clear_bit(BIT_ENABLED, &prd->flags);
}
return 0;
}
static int ux500_pd_runtime_resume(struct device *dev)
{
struct pm_runtime_data *prd = __to_prd(dev);
dev_vdbg(dev, "%s()\n", __func__);
platform_pm_runtime_used(dev, prd);
if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
if (prd->pins)
ux500_pins_enable(prd->pins);
if (prd->regulator)
ux500_regulator_atomic_enable(prd->regulator);
set_bit(BIT_ENABLED, &prd->flags);
}
return 0;
}
static int ux500_pd_suspend_noirq(struct device *dev)
{
struct pm_runtime_data *prd = __to_prd(dev);
int ret;
dev_vdbg(dev, "%s()\n", __func__);
/* Only handle devices that use runtime pm */
if (!prd || !test_bit(BIT_ONCE, &prd->flags))
return 0;
/* Already is runtime suspended? Nothing to do. */
if (pm_runtime_suspended(dev))
return 0;
/*
* We get here only if the device was not runtime suspended for some
* reason. We still need to do the power save stuff when going into
* suspend, so force it here.
*/
ret = pm_generic_runtime_suspend(dev);
if (ret)
return ret;
return ux500_pd_runtime_suspend(dev);
}
static int ux500_pd_resume_noirq(struct device *dev)
{
struct pm_runtime_data *prd = __to_prd(dev);
dev_vdbg(dev, "%s()\n", __func__);
/* Only handle devices that use runtime pm */
if (!prd || !test_bit(BIT_ONCE, &prd->flags))
return 0;
/*
* Already was runtime suspended? No need to resume here, runtime
* resume will take care of it.
*/
if (pm_runtime_suspended(dev))
return 0;
/*
* We get here only if the device was not runtime suspended,
* but we forced it down in suspend_noirq above. Bring it
* up since pm-runtime thinks it is not suspended.
*/
ux500_pd_runtime_resume(dev);
return pm_generic_runtime_resume(dev);
}
static int ux500_pd_bus_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
struct pm_runtime_data *prd;
dev_dbg(dev, "%s() %ld !\n", __func__, action);
if (action == BUS_NOTIFY_BIND_DRIVER) {
prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL);
if (prd) {
devres_add(dev, prd);
platform_pm_runtime_init(dev, prd);
} else
dev_err(dev, "unable to alloc memory for runtime pm\n");
}
return 0;
}
#else /* CONFIG_PM_RUNTIME */
#define ux500_pd_suspend_noirq NULL
#define ux500_pd_resume_noirq NULL
#define ux500_pd_runtime_suspend NULL
#define ux500_pd_runtime_resume NULL
static int ux500_pd_bus_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct ux500_regulator *regulator = NULL;
struct ux500_pins *pins = NULL;
struct device *dev = data;
const char *onoff = NULL;
dev_dbg(dev, "%s() %ld !\n", __func__, action);
switch (action) {
case BUS_NOTIFY_BIND_DRIVER:
pins = ux500_pins_get(dev_name(dev));
if (pins) {
ux500_pins_enable(pins);
ux500_pins_put(pins);
}
regulator = ux500_regulator_get(dev);
if (IS_ERR(regulator))
regulator = NULL;
else {
ux500_regulator_atomic_enable(regulator);
ux500_regulator_put(regulator);
}
onoff = "on";
break;
case BUS_NOTIFY_UNBOUND_DRIVER:
pins = ux500_pins_get(dev_name(dev));
if (pins) {
ux500_pins_disable(pins);
ux500_pins_put(pins);
}
regulator = ux500_regulator_get(dev);
if (IS_ERR(regulator))
regulator = NULL;
else {
ux500_regulator_atomic_disable(regulator);
ux500_regulator_put(regulator);
}
onoff = "off";
break;
}
if (pins || regulator) {
dev_info(dev, "runtime pm disabled, forced %s: %s%s\n",
onoff,
pins ? "pins " : "",
regulator ? "regulator " : "");
}
return 0;
}
#endif /* CONFIG_PM_RUNTIME */
struct dev_power_domain ux500_amba_dev_power_domain = {
.ops = {
/* USE_AMBA_PM_SLEEP_OPS minus the two we replace */
.prepare = amba_pm_prepare,
.complete = amba_pm_complete,
.suspend = amba_pm_suspend,
.resume = amba_pm_resume,
.freeze = amba_pm_freeze,
.thaw = amba_pm_thaw,
.poweroff = amba_pm_poweroff,
.restore = amba_pm_restore,
.freeze_noirq = amba_pm_freeze_noirq,
.thaw_noirq = amba_pm_thaw_noirq,
.poweroff_noirq = amba_pm_poweroff_noirq,
.restore_noirq = amba_pm_restore_noirq,
.suspend_noirq = ux500_pd_suspend_noirq,
.resume_noirq = ux500_pd_resume_noirq,
.runtime_idle = ux500_pd_runtime_idle,
.runtime_suspend = ux500_pd_runtime_suspend,
.runtime_resume = ux500_pd_runtime_resume,
},
};
struct dev_power_domain ux500_dev_power_domain = {
.ops = {
/* USE_PLATFORM_PM_SLEEP_OPS minus the two we replace */
.prepare = platform_pm_prepare,
.complete = platform_pm_complete,
.suspend = platform_pm_suspend,
.resume = platform_pm_resume,
.freeze = platform_pm_freeze,
.thaw = platform_pm_thaw,
.poweroff = platform_pm_poweroff,
.restore = platform_pm_restore,
.freeze_noirq = platform_pm_freeze_noirq,
.thaw_noirq = platform_pm_thaw_noirq,
.poweroff_noirq = platform_pm_poweroff_noirq,
.restore_noirq = platform_pm_restore_noirq,
.suspend_noirq = ux500_pd_suspend_noirq,
.resume_noirq = ux500_pd_resume_noirq,
.runtime_idle = ux500_pd_runtime_idle,
.runtime_suspend = ux500_pd_runtime_suspend,
.runtime_resume = ux500_pd_runtime_resume,
},
};
static struct notifier_block ux500_pd_platform_notifier = {
.notifier_call = ux500_pd_bus_notify,
};
static struct notifier_block ux500_pd_amba_notifier = {
.notifier_call = ux500_pd_bus_notify,
};
static int __init ux500_pm_runtime_platform_init(void)
{
bus_register_notifier(&platform_bus_type, &ux500_pd_platform_notifier);
return 0;
}
core_initcall(ux500_pm_runtime_platform_init);
/*
* The amba bus itself gets registered in a core_initcall, so we can't use
* that.
*/
static int __init ux500_pm_runtime_amba_init(void)
{
bus_register_notifier(&amba_bustype, &ux500_pd_amba_notifier);
return 0;
}
arch_initcall(ux500_pm_runtime_amba_init);
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