/*
* Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS - Power Management support
*
* Based on arch/arm/mach-s3c2410/pm.c
* Copyright (c) 2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* 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/syscore_ops.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/smp_scu.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/pll.h>
#include <plat/regs-srom.h>
#include <mach/regs-irq.h>
#include <mach/regs-gpio.h>
#include <mach/regs-clock.h>
#include <mach/regs-pmu.h>
#include <mach/pm-core.h>
#include <mach/pmu.h>
static struct sleep_save exynos4_set_clksrc[] = {
{ .reg = EXYNOS4_CLKSRC_MASK_TOP , .val = 0x00000001, },
{ .reg = EXYNOS4_CLKSRC_MASK_CAM , .val = 0x11111111, },
{ .reg = EXYNOS4_CLKSRC_MASK_TV , .val = 0x00000111, },
{ .reg = EXYNOS4_CLKSRC_MASK_LCD0 , .val = 0x00001111, },
{ .reg = EXYNOS4_CLKSRC_MASK_MAUDIO , .val = 0x00000001, },
{ .reg = EXYNOS4_CLKSRC_MASK_FSYS , .val = 0x01011111, },
{ .reg = EXYNOS4_CLKSRC_MASK_PERIL0 , .val = 0x01111111, },
{ .reg = EXYNOS4_CLKSRC_MASK_PERIL1 , .val = 0x01110111, },
{ .reg = EXYNOS4_CLKSRC_MASK_DMC , .val = 0x00010000, },
};
static struct sleep_save exynos4210_set_clksrc[] = {
{ .reg = EXYNOS4210_CLKSRC_MASK_LCD1 , .val = 0x00001111, },
};
static struct sleep_save exynos4_epll_save[] = {
SAVE_ITEM(EXYNOS4_EPLL_CON0),
SAVE_ITEM(EXYNOS4_EPLL_CON1),
};
static struct sleep_save exynos4_vpll_save[] = {
SAVE_ITEM(EXYNOS4_VPLL_CON0),
SAVE_ITEM(EXYNOS4_VPLL_CON1),
};
static struct sleep_save exynos5_sys_save[] = {
SAVE_ITEM(EXYNOS5_SYS_I2C_CFG),
};
static struct sleep_save exynos_core_save[] = {
/* SROM side */
SAVE_ITEM(S5P_SROM_BW),
SAVE_ITEM(S5P_SROM_BC0),
SAVE_ITEM(S5P_SROM_BC1),
SAVE_ITEM(S5P_SROM_BC2),
SAVE_ITEM(S5P_SROM_BC3),
};
/* For Cortex-A9 Diagnostic and Power control register */
static unsigned int save_arm_register[2];
static int exynos_cpu_suspend(unsigned long arg)
{
#ifdef CONFIG_CACHE_L2X0
outer_flush_all();
#endif
if (soc_is_exynos5250())
flush_cache_all();
/* issue the standby signal into the pm unit. */
cpu_do_idle();
/* we should never get past here */
panic("sleep resumed to originator?");
}
static void exynos_pm_prepare(void)
{
unsigned int tmp;
s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
if (!soc_is_exynos5250()) {
s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save));
s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save));
} else {
s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save));
/* Disable USE_RETENTION of JPEG_MEM_OPTION */
tmp = __raw_readl(EXYNOS5_JPEG_MEM_OPTION);
tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
__raw_writel(tmp, EXYNOS5_JPEG_MEM_OPTION);
}
/* Set value of power down register for sleep mode */
exynos_sys_powerdown_conf(SYS_SLEEP);
__raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
/* ensure at least INFORM0 has the resume address */
__raw_writel(virt_to_phys(s3c_cpu_resume), S5P_INFORM0);
/* Before enter central sequence mode, clock src register have to set */
if (!soc_is_exynos5250())
s3c_pm_do_restore_core(exynos4_set_clksrc, ARRAY_SIZE(exynos4_set_clksrc));
if (soc_is_exynos4210())
s3c_pm_do_restore_core(exynos4210_set_clksrc, ARRAY_SIZE(exynos4210_set_clksrc));
}
static int exynos_pm_add(struct device *dev, struct subsys_interface *sif)
{
pm_cpu_prep = exynos_pm_prepare;
pm_cpu_sleep = exynos_cpu_suspend;
return 0;
}
static unsigned long pll_base_rate;
static void exynos4_restore_pll(void)
{
unsigned long pll_con, locktime, lockcnt;
unsigned long pll_in_rate;
unsigned int p_div, epll_wait = 0, vpll_wait = 0;
if (pll_base_rate == 0)
return;
pll_in_rate = pll_base_rate;
/* EPLL */
pll_con = exynos4_epll_save[0].val;
if (pll_con & (1 << 31)) {
pll_con &= (PLL46XX_PDIV_MASK << PLL46XX_PDIV_SHIFT);
p_div = (pll_con >> PLL46XX_PDIV_SHIFT);
pll_in_rate /= 1000000;
locktime = (3000 / pll_in_rate) * p_div;
lockcnt = locktime * 10000 / (10000 / pll_in_rate);
__raw_writel(lockcnt, EXYNOS4_EPLL_LOCK);
s3c_pm_do_restore_core(exynos4_epll_save,
ARRAY_SIZE(exynos4_epll_save));
epll_wait = 1;
}
pll_in_rate = pll_base_rate;
/* VPLL */
pll_con = exynos4_vpll_save[0].val;
if (pll_con & (1 << 31)) {
pll_in_rate /= 1000000;
/* 750us */
locktime = 750;
lockcnt = locktime * 10000 / (10000 / pll_in_rate);
__raw_writel(lockcnt, EXYNOS4_VPLL_LOCK);
s3c_pm_do_restore_core(exynos4_vpll_save,
ARRAY_SIZE(exynos4_vpll_save));
vpll_wait = 1;
}
/* Wait PLL locking */
do {
if (epll_wait) {
pll_con = __raw_readl(EXYNOS4_EPLL_CON0);
if (pll_con & (1 << EXYNOS4_EPLLCON0_LOCKED_SHIFT))
epll_wait = 0;
}
if (vpll_wait) {
pll_con = __raw_readl(EXYNOS4_VPLL_CON0);
if (pll_con & (1 << EXYNOS4_VPLLCON0_LOCKED_SHIFT))
vpll_wait = 0;
}
} while (epll_wait || vpll_wait);
}
static struct subsys_interface exynos_pm_interface = {
.name = "exynos_pm",
.subsys = &exynos_subsys,
.add_dev = exynos_pm_add,
};
static __init int exynos_pm_drvinit(void)
{
struct clk *pll_base;
unsigned int tmp;
s3c_pm_init();
/* All wakeup disable */
tmp = __raw_readl(S5P_WAKEUP_MASK);
tmp |= ((0xFF << 8) | (0x1F << 1));
__raw_writel(tmp, S5P_WAKEUP_MASK);
if (!soc_is_exynos5250()) {
pll_base = clk_get(NULL, "xtal");
if (!IS_ERR(pll_base)) {
pll_base_rate = clk_get_rate(pll_base);
clk_put(pll_base);
}
}
return subsys_interface_register(&exynos_pm_interface);
}
arch_initcall(exynos_pm_drvinit);
static int exynos_pm_suspend(void)
{
unsigned long tmp;
/* Setting Central Sequence Register for power down mode */
tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
__raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* Setting SEQ_OPTION register */
tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
__raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
if (!soc_is_exynos5250()) {
/* Save Power control register */
asm ("mrc p15, 0, %0, c15, c0, 0"
: "=r" (tmp) : : "cc");
save_arm_register[0] = tmp;
/* Save Diagnostic register */
asm ("mrc p15, 0, %0, c15, c0, 1"
: "=r" (tmp) : : "cc");
save_arm_register[1] = tmp;
}
return 0;
}
static void exynos_pm_resume(void)
{
unsigned long tmp;
/*
* If PMU failed while entering sleep mode, WFI will be
* ignored by PMU and then exiting cpu_do_idle().
* S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
* in this situation.
*/
tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
tmp |= S5P_CENTRAL_LOWPWR_CFG;
__raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* No need to perform below restore code */
goto early_wakeup;
}
if (!soc_is_exynos5250()) {
/* Restore Power control register */
tmp = save_arm_register[0];
asm volatile ("mcr p15, 0, %0, c15, c0, 0"
: : "r" (tmp)
: "cc");
/* Restore Diagnostic register */
tmp = save_arm_register[1];
asm volatile ("mcr p15, 0, %0, c15, c0, 1"
: : "r" (tmp)
: "cc");
}
/* For release retention */
__raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
if (soc_is_exynos5250())
s3c_pm_do_restore(exynos5_sys_save,
ARRAY_SIZE(exynos5_sys_save));
s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
if (!soc_is_exynos5250()) {
exynos4_restore_pll();
#ifdef CONFIG_SMP
scu_enable(S5P_VA_SCU);
#endif
}
early_wakeup:
/* Clear SLEEP mode set in INFORM1 */
__raw_writel(0x0, S5P_INFORM1);
return;
}
static struct syscore_ops exynos_pm_syscore_ops = {
.suspend = exynos_pm_suspend,
.resume = exynos_pm_resume,
};
static __init int exynos_pm_syscore_init(void)
{
register_syscore_ops(&exynos_pm_syscore_ops);
return 0;
}
arch_initcall(exynos_pm_syscore_init);
