/* linux/arch/arm/mach-s5p64x0/pm.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* S5P64X0 Power Management Support
*
* Based on arch/arm/mach-s3c64xx/pm.c by Ben Dooks
*
* 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/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/io.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/regs-timer.h>
#include <plat/wakeup-mask.h>
#include <mach/regs-clock.h>
#include <mach/regs-gpio.h>
static struct sleep_save s5p64x0_core_save[] = {
SAVE_ITEM(S5P64X0_APLL_CON),
SAVE_ITEM(S5P64X0_MPLL_CON),
SAVE_ITEM(S5P64X0_EPLL_CON),
SAVE_ITEM(S5P64X0_EPLL_CON_K),
SAVE_ITEM(S5P64X0_CLK_SRC0),
SAVE_ITEM(S5P64X0_CLK_SRC1),
SAVE_ITEM(S5P64X0_CLK_DIV0),
SAVE_ITEM(S5P64X0_CLK_DIV1),
SAVE_ITEM(S5P64X0_CLK_DIV2),
SAVE_ITEM(S5P64X0_CLK_DIV3),
SAVE_ITEM(S5P64X0_CLK_GATE_MEM0),
SAVE_ITEM(S5P64X0_CLK_GATE_HCLK1),
SAVE_ITEM(S5P64X0_CLK_GATE_SCLK1),
};
static struct sleep_save s5p64x0_misc_save[] = {
SAVE_ITEM(S5P64X0_AHB_CON0),
SAVE_ITEM(S5P64X0_SPCON0),
SAVE_ITEM(S5P64X0_SPCON1),
SAVE_ITEM(S5P64X0_MEM0CONSLP0),
SAVE_ITEM(S5P64X0_MEM0CONSLP1),
SAVE_ITEM(S5P64X0_MEM0DRVCON),
SAVE_ITEM(S5P64X0_MEM1DRVCON),
SAVE_ITEM(S3C64XX_TINT_CSTAT),
};
/* DPLL is present only in S5P6450 */
static struct sleep_save s5p6450_core_save[] = {
SAVE_ITEM(S5P6450_DPLL_CON),
SAVE_ITEM(S5P6450_DPLL_CON_K),
};
void s3c_pm_configure_extint(void)
{
__raw_writel(s3c_irqwake_eintmask, S5P64X0_EINT_WAKEUP_MASK);
}
void s3c_pm_restore_core(void)
{
__raw_writel(0, S5P64X0_EINT_WAKEUP_MASK);
s3c_pm_do_restore_core(s5p64x0_core_save,
ARRAY_SIZE(s5p64x0_core_save));
if (soc_is_s5p6450())
s3c_pm_do_restore_core(s5p6450_core_save,
ARRAY_SIZE(s5p6450_core_save));
s3c_pm_do_restore(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save));
}
void s3c_pm_save_core(void)
{
s3c_pm_do_save(s5p64x0_misc_save, ARRAY_SIZE(s5p64x0_misc_save));
if (soc_is_s5p6450())
s3c_pm_do_save(s5p6450_core_save,
ARRAY_SIZE(s5p6450_core_save));
s3c_pm_do_save(s5p64x0_core_save, ARRAY_SIZE(s5p64x0_core_save));
}
static int s5p64x0_cpu_suspend(unsigned long arg)
{
unsigned long tmp = 0;
/*
* Issue the standby signal into the pm unit. Note, we
* issue a write-buffer drain just in case.
*/
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));
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 s5p64x0_wake_irqs[] = {
{ .irq = IRQ_RTC_ALARM, .bit = S5P64X0_PWR_CFG_RTC_ALRM_DISABLE, },
{ .irq = IRQ_RTC_TIC, .bit = S5P64X0_PWR_CFG_RTC_TICK_DISABLE, },
{ .irq = IRQ_HSMMC0, .bit = S5P64X0_PWR_CFG_MMC0_DISABLE, },
{ .irq = IRQ_HSMMC1, .bit = S5P64X0_PWR_CFG_MMC1_DISABLE, },
};
static void s5p64x0_pm_prepare(void)
{
u32 tmp;
samsung_sync_wakemask(S5P64X0_PWR_CFG,
s5p64x0_wake_irqs, ARRAY_SIZE(s5p64x0_wake_irqs));
/* store the resume address in INFORM0 register */
__raw_writel(virt_to_phys(s3c_cpu_resume), S5P64X0_INFORM0);
/* setup clock gating for FIMGVG block */
__raw_writel((__raw_readl(S5P64X0_CLK_GATE_HCLK1) | \
(S5P64X0_CLK_GATE_HCLK1_FIMGVG)), S5P64X0_CLK_GATE_HCLK1);
__raw_writel((__raw_readl(S5P64X0_CLK_GATE_SCLK1) | \
(S5P64X0_CLK_GATE_SCLK1_FIMGVG)), S5P64X0_CLK_GATE_SCLK1);
/* Configure the stabilization counter with wait time required */
__raw_writel(S5P64X0_PWR_STABLE_PWR_CNT_VAL4, S5P64X0_PWR_STABLE);
/* set WFI to SLEEP mode configuration */
tmp = __raw_readl(S5P64X0_SLEEP_CFG);
tmp &= ~(S5P64X0_SLEEP_CFG_OSC_EN);
__raw_writel(tmp, S5P64X0_SLEEP_CFG);
tmp = __raw_readl(S5P64X0_PWR_CFG);
tmp &= ~(S5P64X0_PWR_CFG_WFI_MASK);
tmp |= S5P64X0_PWR_CFG_WFI_SLEEP;
__raw_writel(tmp, S5P64X0_PWR_CFG);
/*
* set OTHERS register to disable interrupt before going to
* sleep. This bit is present only in S5P6450, it is reserved
* in S5P6440.
*/
if (soc_is_s5p6450()) {
tmp = __raw_readl(S5P64X0_OTHERS);
tmp |= S5P6450_OTHERS_DISABLE_INT;
__raw_writel(tmp, S5P64X0_OTHERS);
}
/* ensure previous wakeup state is cleared before sleeping */
__raw_writel(__raw_readl(S5P64X0_WAKEUP_STAT), S5P64X0_WAKEUP_STAT);
}
static int s5p64x0_pm_add(struct device *dev, struct subsys_interface *sif)
{
pm_cpu_prep = s5p64x0_pm_prepare;
pm_cpu_sleep = s5p64x0_cpu_suspend;
pm_uart_udivslot = 1;
return 0;
}
static struct subsys_interface s5p64x0_pm_interface = {
.name = "s5p64x0_pm",
.subsys = &s5p64x0_subsys,
.add_dev = s5p64x0_pm_add,
};
static __init int s5p64x0_pm_drvinit(void)
{
s3c_pm_init();
return subsys_interface_register(&s5p64x0_pm_interface);
}
arch_initcall(s5p64x0_pm_drvinit);
static void s5p64x0_pm_resume(void)
{
u32 tmp;
tmp = __raw_readl(S5P64X0_OTHERS);
tmp |= (S5P64X0_OTHERS_RET_MMC0 | S5P64X0_OTHERS_RET_MMC1 | \
S5P64X0_OTHERS_RET_UART);
__raw_writel(tmp , S5P64X0_OTHERS);
}
static struct syscore_ops s5p64x0_pm_syscore_ops = {
.resume = s5p64x0_pm_resume,
};
static __init int s5p64x0_pm_syscore_init(void)
{
register_syscore_ops(&s5p64x0_pm_syscore_ops);
return 0;
}
arch_initcall(s5p64x0_pm_syscore_init);
