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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 <mach/map.h>
#include <plat/pm.h>
#include <plat/regs-sys.h>
#include <plat/regs-gpio.h>
#include <plat/regs-clock.h>
#include <plat/regs-syscon-power.h>
#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
#include <plat/gpio-bank-n.h>
void s3c_pm_debug_smdkled(u32 set, u32 clear)
{
unsigned long flags;
u32 reg;
local_irq_save(flags);
reg = __raw_readl(S3C64XX_GPNCON);
reg &= ~(S3C64XX_GPN_CONMASK(12) | S3C64XX_GPN_CONMASK(13) |
S3C64XX_GPN_CONMASK(14) | S3C64XX_GPN_CONMASK(15));
reg |= S3C64XX_GPN_OUTPUT(12) | S3C64XX_GPN_OUTPUT(13) |
S3C64XX_GPN_OUTPUT(14) | S3C64XX_GPN_OUTPUT(15);
__raw_writel(reg, S3C64XX_GPNCON);
reg = __raw_readl(S3C64XX_GPNDAT);
reg &= ~(clear << 12);
reg |= set << 12;
__raw_writel(reg, S3C64XX_GPNDAT);
local_irq_restore(flags);
}
#endif
static struct sleep_save core_save[] = {
SAVE_ITEM(S3C_APLL_LOCK),
SAVE_ITEM(S3C_MPLL_LOCK),
SAVE_ITEM(S3C_EPLL_LOCK),
SAVE_ITEM(S3C_CLK_SRC),
SAVE_ITEM(S3C_CLK_DIV0),
SAVE_ITEM(S3C_CLK_DIV1),
SAVE_ITEM(S3C_CLK_DIV2),
SAVE_ITEM(S3C_CLK_OUT),
SAVE_ITEM(S3C_HCLK_GATE),
SAVE_ITEM(S3C_PCLK_GATE),
SAVE_ITEM(S3C_SCLK_GATE),
SAVE_ITEM(S3C_MEM0_GATE),
SAVE_ITEM(S3C_EPLL_CON1),
SAVE_ITEM(S3C_EPLL_CON0),
#ifndef CONFIG_CPU_FREQ
SAVE_ITEM(S3C_APLL_CON),
SAVE_ITEM(S3C_MPLL_CON),
#endif
};
static struct sleep_save misc_save[] = {
SAVE_ITEM(S3C64XX_AHB_CON0),
SAVE_ITEM(S3C64XX_AHB_CON1),
SAVE_ITEM(S3C64XX_AHB_CON2),
};
void s3c_pm_configure_extint(void)
{
__raw_writel(s3c_irqwake_eintmask, S3C64XX_EINT_MASK);
__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 void s3c64xx_cpu_suspend(void)
{
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);
/* 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 */
panic("sleep resumed to originator?");
}
static void s3c64xx_pm_prepare(void)
{
/* 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);
}
static int s3c64xx_pm_init(void)
{
pm_cpu_prep = s3c64xx_pm_prepare;
pm_cpu_sleep = s3c64xx_cpu_suspend;
pm_uart_udivslot = 1;
return 0;
}
arch_initcall(s3c64xx_pm_init);
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