Linux Kernel iMX6
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/* linux/arch/arm/plat-s3c64xx/pm.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX CPU PM support.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/serial_core.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/pm_domain.h>
#include <mach/map.h>
#include <mach/irqs.h>
#include <plat/devs.h>
#include <plat/pm.h>
#include <plat/wakeup-mask.h>
#include <mach/regs-gpio.h>
#include <mach/regs-clock.h>
#include <mach/gpio-samsung.h>
#include "regs-gpio-memport.h"
#include "regs-modem.h"
#include "regs-sys.h"
#include "regs-syscon-power.h"
struct s3c64xx_pm_domain {
char *const name;
u32 ena;
u32 pwr_stat;
struct generic_pm_domain pd;
};
static int s3c64xx_pd_off(struct generic_pm_domain *domain)
{
struct s3c64xx_pm_domain *pd;
u32 val;
pd = container_of(domain, struct s3c64xx_pm_domain, pd);
val = __raw_readl(S3C64XX_NORMAL_CFG);
val &= ~(pd->ena);
__raw_writel(val, S3C64XX_NORMAL_CFG);
return 0;
}
static int s3c64xx_pd_on(struct generic_pm_domain *domain)
{
struct s3c64xx_pm_domain *pd;
u32 val;
long retry = 1000000L;
pd = container_of(domain, struct s3c64xx_pm_domain, pd);
val = __raw_readl(S3C64XX_NORMAL_CFG);
val |= pd->ena;
__raw_writel(val, S3C64XX_NORMAL_CFG);
/* Not all domains provide power status readback */
if (pd->pwr_stat) {
do {
cpu_relax();
if (__raw_readl(S3C64XX_BLK_PWR_STAT) & pd->pwr_stat)
break;
} while (retry--);
if (!retry) {
pr_err("Failed to start domain %s\n", pd->name);
return -EBUSY;
}
}
return 0;
}
static struct s3c64xx_pm_domain s3c64xx_pm_irom = {
.name = "IROM",
.ena = S3C64XX_NORMALCFG_IROM_ON,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_etm = {
.name = "ETM",
.ena = S3C64XX_NORMALCFG_DOMAIN_ETM_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_ETM,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_s = {
.name = "S",
.ena = S3C64XX_NORMALCFG_DOMAIN_S_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_S,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_f = {
.name = "F",
.ena = S3C64XX_NORMALCFG_DOMAIN_F_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_F,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_p = {
.name = "P",
.ena = S3C64XX_NORMALCFG_DOMAIN_P_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_P,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_i = {
.name = "I",
.ena = S3C64XX_NORMALCFG_DOMAIN_I_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_I,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_g = {
.name = "G",
.ena = S3C64XX_NORMALCFG_DOMAIN_G_ON,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain s3c64xx_pm_v = {
.name = "V",
.ena = S3C64XX_NORMALCFG_DOMAIN_V_ON,
.pwr_stat = S3C64XX_BLKPWRSTAT_V,
.pd = {
.power_off = s3c64xx_pd_off,
.power_on = s3c64xx_pd_on,
},
};
static struct s3c64xx_pm_domain *s3c64xx_always_on_pm_domains[] = {
&s3c64xx_pm_irom,
};
static struct s3c64xx_pm_domain *s3c64xx_pm_domains[] = {
&s3c64xx_pm_etm,
&s3c64xx_pm_g,
&s3c64xx_pm_v,
&s3c64xx_pm_i,
&s3c64xx_pm_p,
&s3c64xx_pm_s,
&s3c64xx_pm_f,
};
#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
void s3c_pm_debug_smdkled(u32 set, u32 clear)
{
unsigned long flags;
int i;
local_irq_save(flags);
for (i = 0; i < 4; i++) {
if (clear & (1 << i))
gpio_set_value(S3C64XX_GPN(12 + i), 0);
if (set & (1 << i))
gpio_set_value(S3C64XX_GPN(12 + i), 1);
}
local_irq_restore(flags);
}
#endif
static struct sleep_save core_save[] = {
SAVE_ITEM(S3C64XX_MEM0DRVCON),
SAVE_ITEM(S3C64XX_MEM1DRVCON),
};
static struct sleep_save misc_save[] = {
SAVE_ITEM(S3C64XX_AHB_CON0),
SAVE_ITEM(S3C64XX_AHB_CON1),
SAVE_ITEM(S3C64XX_AHB_CON2),
SAVE_ITEM(S3C64XX_SPCON),
SAVE_ITEM(S3C64XX_MEM0CONSTOP),
SAVE_ITEM(S3C64XX_MEM1CONSTOP),
SAVE_ITEM(S3C64XX_MEM0CONSLP0),
SAVE_ITEM(S3C64XX_MEM0CONSLP1),
SAVE_ITEM(S3C64XX_MEM1CONSLP),
SAVE_ITEM(S3C64XX_SDMA_SEL),
SAVE_ITEM(S3C64XX_MODEM_MIFPCON),
SAVE_ITEM(S3C64XX_NORMAL_CFG),
};
void s3c_pm_configure_extint(void)
{
__raw_writel(s3c_irqwake_eintmask, S3C64XX_EINT_MASK);
}
void s3c_pm_restore_core(void)
{
__raw_writel(0, S3C64XX_EINT_MASK);
s3c_pm_debug_smdkled(1 << 2, 0);
s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
}
void s3c_pm_save_core(void)
{
s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
}
/* since both s3c6400 and s3c6410 share the same sleep pm calls, we
* put the per-cpu code in here until any new cpu comes along and changes
* this.
*/
static int s3c64xx_cpu_suspend(unsigned long arg)
{
unsigned long tmp;
/* set our standby method to sleep */
tmp = __raw_readl(S3C64XX_PWR_CFG);
tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
tmp |= S3C64XX_PWRCFG_CFG_WFI_SLEEP;
__raw_writel(tmp, S3C64XX_PWR_CFG);
/* clear any old wakeup */
__raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT),
S3C64XX_WAKEUP_STAT);
/* set the LED state to 0110 over sleep */
s3c_pm_debug_smdkled(3 << 1, 0xf);
/* issue the standby signal into the pm unit. Note, we
* issue a write-buffer drain just in case */
tmp = 0;
asm("b 1f\n\t"
".align 5\n\t"
"1:\n\t"
"mcr p15, 0, %0, c7, c10, 5\n\t"
"mcr p15, 0, %0, c7, c10, 4\n\t"
"mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
/* we should never get past here */
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
/* mapping of interrupts to parts of the wakeup mask */
static struct samsung_wakeup_mask wake_irqs[] = {
{ .irq = IRQ_RTC_ALARM, .bit = S3C64XX_PWRCFG_RTC_ALARM_DISABLE, },
{ .irq = IRQ_RTC_TIC, .bit = S3C64XX_PWRCFG_RTC_TICK_DISABLE, },
{ .irq = IRQ_PENDN, .bit = S3C64XX_PWRCFG_TS_DISABLE, },
{ .irq = IRQ_HSMMC0, .bit = S3C64XX_PWRCFG_MMC0_DISABLE, },
{ .irq = IRQ_HSMMC1, .bit = S3C64XX_PWRCFG_MMC1_DISABLE, },
{ .irq = IRQ_HSMMC2, .bit = S3C64XX_PWRCFG_MMC2_DISABLE, },
{ .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_BATF_DISABLE},
{ .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
{ .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_HSI_DISABLE },
{ .irq = NO_WAKEUP_IRQ, .bit = S3C64XX_PWRCFG_MSM_DISABLE },
};
static void s3c64xx_pm_prepare(void)
{
samsung_sync_wakemask(S3C64XX_PWR_CFG,
wake_irqs, ARRAY_SIZE(wake_irqs));
/* store address of resume. */
__raw_writel(virt_to_phys(s3c_cpu_resume), S3C64XX_INFORM0);
/* ensure previous wakeup state is cleared before sleeping */
__raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT), S3C64XX_WAKEUP_STAT);
}
int __init s3c64xx_pm_init(void)
{
int i;
s3c_pm_init();
for (i = 0; i < ARRAY_SIZE(s3c64xx_always_on_pm_domains); i++)
pm_genpd_init(&s3c64xx_always_on_pm_domains[i]->pd,
&pm_domain_always_on_gov, false);
for (i = 0; i < ARRAY_SIZE(s3c64xx_pm_domains); i++)
pm_genpd_init(&s3c64xx_pm_domains[i]->pd, NULL, false);
#ifdef CONFIG_S3C_DEV_FB
if (dev_get_platdata(&s3c_device_fb.dev))
pm_genpd_add_device(&s3c64xx_pm_f.pd, &s3c_device_fb.dev);
#endif
return 0;
}
static __init int s3c64xx_pm_initcall(void)
{
pm_cpu_prep = s3c64xx_pm_prepare;
pm_cpu_sleep = s3c64xx_cpu_suspend;
pm_uart_udivslot = 1;
#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
gpio_request(S3C64XX_GPN(12), "DEBUG_LED0");
gpio_request(S3C64XX_GPN(13), "DEBUG_LED1");
gpio_request(S3C64XX_GPN(14), "DEBUG_LED2");
gpio_request(S3C64XX_GPN(15), "DEBUG_LED3");
gpio_direction_output(S3C64XX_GPN(12), 0);
gpio_direction_output(S3C64XX_GPN(13), 0);
gpio_direction_output(S3C64XX_GPN(14), 0);
gpio_direction_output(S3C64XX_GPN(15), 0);
#endif
return 0;
}
arch_initcall(s3c64xx_pm_initcall);
int __init s3c64xx_pm_late_initcall(void)
{
pm_genpd_poweroff_unused();
return 0;
}