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/*
* sh7372 Power management support
*
* Copyright (C) 2011 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <mach/common.h>
#include <mach/sh7372.h>
#define SMFRAM 0xe6a70000
#define SYSTBCR 0xe6150024
#define SBAR 0xe6180020
#define APARMBAREA 0xe6f10020
#define SPDCR 0xe6180008
#define SWUCR 0xe6180014
#define PSTR 0xe6180080
#define PSTR_RETRIES 100
#define PSTR_DELAY_US 10
#ifdef CONFIG_PM
static int pd_power_down(struct generic_pm_domain *genpd)
{
struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
unsigned int mask = 1 << sh7372_pd->bit_shift;
if (__raw_readl(PSTR) & mask) {
unsigned int retry_count;
__raw_writel(mask, SPDCR);
for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
if (!(__raw_readl(SPDCR) & mask))
break;
cpu_relax();
}
}
pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
mask, __raw_readl(PSTR));
return 0;
}
static int pd_power_up(struct generic_pm_domain *genpd)
{
struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
unsigned int mask = 1 << sh7372_pd->bit_shift;
unsigned int retry_count;
int ret = 0;
if (__raw_readl(PSTR) & mask)
goto out;
__raw_writel(mask, SWUCR);
for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
if (!(__raw_readl(SWUCR) & mask))
goto out;
if (retry_count > PSTR_RETRIES)
udelay(PSTR_DELAY_US);
else
cpu_relax();
}
if (__raw_readl(SWUCR) & mask)
ret = -EIO;
out:
pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
mask, __raw_readl(PSTR));
return ret;
}
static bool pd_active_wakeup(struct device *dev)
{
return true;
}
void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
{
struct generic_pm_domain *genpd = &sh7372_pd->genpd;
pm_genpd_init(genpd, NULL, false);
genpd->stop_device = pm_clk_suspend;
genpd->start_device = pm_clk_resume;
genpd->active_wakeup = pd_active_wakeup;
genpd->power_off = pd_power_down;
genpd->power_on = pd_power_up;
pd_power_up(&sh7372_pd->genpd);
}
void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
if (!dev->power.subsys_data) {
pm_clk_init(dev);
pm_clk_add(dev, NULL);
}
pm_genpd_add_device(&sh7372_pd->genpd, dev);
}
struct sh7372_pm_domain sh7372_a4lc = {
.bit_shift = 1,
};
struct sh7372_pm_domain sh7372_a3rv = {
.bit_shift = 6,
};
#endif /* CONFIG_PM */
static void sh7372_enter_core_standby(void)
{
void __iomem *smfram = (void __iomem *)SMFRAM;
__raw_writel(0, APARMBAREA); /* translate 4k */
__raw_writel(__pa(sh7372_cpu_resume), SBAR); /* set reset vector */
__raw_writel(0x10, SYSTBCR); /* enable core standby */
__raw_writel(0, smfram + 0x3c); /* clear page table address */
sh7372_cpu_suspend();
cpu_init();
/* if page table address is non-NULL then we have been powered down */
if (__raw_readl(smfram + 0x3c)) {
__raw_writel(__raw_readl(smfram + 0x40),
__va(__raw_readl(smfram + 0x3c)));
flush_tlb_all();
set_cr(__raw_readl(smfram + 0x38));
}
__raw_writel(0, SYSTBCR); /* disable core standby */
__raw_writel(0, SBAR); /* disable reset vector translation */
}
#ifdef CONFIG_CPU_IDLE
static void sh7372_cpuidle_setup(struct cpuidle_device *dev)
{
struct cpuidle_state *state;
int i = dev->state_count;
state = &dev->states[i];
snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
strncpy(state->desc, "Core Standby Mode", CPUIDLE_DESC_LEN);
state->exit_latency = 10;
state->target_residency = 20 + 10;
state->power_usage = 1; /* perhaps not */
state->flags = 0;
state->flags |= CPUIDLE_FLAG_TIME_VALID;
shmobile_cpuidle_modes[i] = sh7372_enter_core_standby;
dev->state_count = i + 1;
}
static void sh7372_cpuidle_init(void)
{
shmobile_cpuidle_setup = sh7372_cpuidle_setup;
}
#else
static void sh7372_cpuidle_init(void) {}
#endif
#ifdef CONFIG_SUSPEND
static int sh7372_enter_suspend(suspend_state_t suspend_state)
{
sh7372_enter_core_standby();
return 0;
}
static void sh7372_suspend_init(void)
{
shmobile_suspend_ops.enter = sh7372_enter_suspend;
}
#else
static void sh7372_suspend_init(void) {}
#endif
#define DBGREG1 0xe6100020
#define DBGREG9 0xe6100040
void __init sh7372_pm_init(void)
{
/* enable DBG hardware block to kick SYSC */
__raw_writel(0x0000a500, DBGREG9);
__raw_writel(0x0000a501, DBGREG9);
__raw_writel(0x00000000, DBGREG1);
sh7372_suspend_init();
sh7372_cpuidle_init();
}
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