/*
* Copyright (c) 2011-2014 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/cpu_pm.h>
#include <linux/io.h>
#include <linux/err.h>
#include <asm/firmware.h>
#include <asm/smp_scu.h>
#include <asm/suspend.h>
#include <mach/map.h>
#include <plat/pm-common.h>
#include "common.h"
#include "exynos-pmu.h"
#include "regs-pmu.h"
static inline void __iomem *exynos_boot_vector_addr(void)
{
if (samsung_rev() == EXYNOS4210_REV_1_1)
return pmu_base_addr + S5P_INFORM7;
else if (samsung_rev() == EXYNOS4210_REV_1_0)
return sysram_base_addr + 0x24;
return pmu_base_addr + S5P_INFORM0;
}
static inline void __iomem *exynos_boot_vector_flag(void)
{
if (samsung_rev() == EXYNOS4210_REV_1_1)
return pmu_base_addr + S5P_INFORM6;
else if (samsung_rev() == EXYNOS4210_REV_1_0)
return sysram_base_addr + 0x20;
return pmu_base_addr + S5P_INFORM1;
}
#define S5P_CHECK_AFTR 0xFCBA0D10
/* For Cortex-A9 Diagnostic and Power control register */
static unsigned int save_arm_register[2];
void exynos_cpu_save_register(void)
{
unsigned long tmp;
/* 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;
}
void exynos_cpu_restore_register(void)
{
unsigned long tmp;
/* 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");
}
void exynos_pm_central_suspend(void)
{
unsigned long tmp;
/* Setting Central Sequence Register for power down mode */
tmp = pmu_raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
pmu_raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
}
int exynos_pm_central_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 = pmu_raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
tmp |= S5P_CENTRAL_LOWPWR_CFG;
pmu_raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* clear the wakeup state register */
pmu_raw_writel(0x0, S5P_WAKEUP_STAT);
/* No need to perform below restore code */
return -1;
}
return 0;
}
/* Ext-GIC nIRQ/nFIQ is the only wakeup source in AFTR */
static void exynos_set_wakeupmask(long mask)
{
pmu_raw_writel(mask, S5P_WAKEUP_MASK);
if (soc_is_exynos3250())
pmu_raw_writel(0x0, S5P_WAKEUP_MASK2);
}
static void exynos_cpu_set_boot_vector(long flags)
{
__raw_writel(virt_to_phys(exynos_cpu_resume),
exynos_boot_vector_addr());
__raw_writel(flags, exynos_boot_vector_flag());
}
static int exynos_aftr_finisher(unsigned long flags)
{
int ret;
exynos_set_wakeupmask(soc_is_exynos3250() ? 0x40003ffe : 0x0000ff3e);
/* Set value of power down register for aftr mode */
exynos_sys_powerdown_conf(SYS_AFTR);
ret = call_firmware_op(do_idle, FW_DO_IDLE_AFTR);
if (ret == -ENOSYS) {
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
exynos_cpu_save_register();
exynos_cpu_set_boot_vector(S5P_CHECK_AFTR);
cpu_do_idle();
}
return 1;
}
void exynos_enter_aftr(void)
{
unsigned int cpuid = smp_processor_id();
cpu_pm_enter();
if (soc_is_exynos3250())
exynos_set_boot_flag(cpuid, C2_STATE);
exynos_pm_central_suspend();
if (of_machine_is_compatible("samsung,exynos4212") ||
of_machine_is_compatible("samsung,exynos4412")) {
/* Setting SEQ_OPTION register */
pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
S5P_CENTRAL_SEQ_OPTION);
}
cpu_suspend(0, exynos_aftr_finisher);
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
scu_enable(S5P_VA_SCU);
if (call_firmware_op(resume) == -ENOSYS)
exynos_cpu_restore_register();
}
exynos_pm_central_resume();
if (soc_is_exynos3250())
exynos_clear_boot_flag(cpuid, C2_STATE);
cpu_pm_exit();
}
#if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
static atomic_t cpu1_wakeup = ATOMIC_INIT(0);
static int exynos_cpu0_enter_aftr(void)
{
int ret = -1;
/*
* If the other cpu is powered on, we have to power it off, because
* the AFTR state won't work otherwise
*/
if (cpu_online(1)) {
/*
* We reach a sync point with the coupled idle state, we know
* the other cpu will power down itself or will abort the
* sequence, let's wait for one of these to happen
*/
while (exynos_cpu_power_state(1)) {
/*
* The other cpu may skip idle and boot back
* up again
*/
if (atomic_read(&cpu1_wakeup))
goto abort;
/*
* The other cpu may bounce through idle and
* boot back up again, getting stuck in the
* boot rom code
*/
if (__raw_readl(cpu_boot_reg_base()) == 0)
goto abort;
cpu_relax();
}
}
exynos_enter_aftr();
ret = 0;
abort:
if (cpu_online(1)) {
/*
* Set the boot vector to something non-zero
*/
__raw_writel(virt_to_phys(exynos_cpu_resume),
cpu_boot_reg_base());
dsb();
/*
* Turn on cpu1 and wait for it to be on
*/
exynos_cpu_power_up(1);
while (exynos_cpu_power_state(1) != S5P_CORE_LOCAL_PWR_EN)
cpu_relax();
while (!atomic_read(&cpu1_wakeup)) {
/*
* Poke cpu1 out of the boot rom
*/
__raw_writel(virt_to_phys(exynos_cpu_resume),
cpu_boot_reg_base());
arch_send_wakeup_ipi_mask(cpumask_of(1));
}
}
return ret;
}
static int exynos_wfi_finisher(unsigned long flags)
{
cpu_do_idle();
return -1;
}
static int exynos_cpu1_powerdown(void)
{
int ret = -1;
/*
* Idle sequence for cpu1
*/
if (cpu_pm_enter())
goto cpu1_aborted;
/*
* Turn off cpu 1
*/
exynos_cpu_power_down(1);
ret = cpu_suspend(0, exynos_wfi_finisher);
cpu_pm_exit();
cpu1_aborted:
dsb();
/*
* Notify cpu 0 that cpu 1 is awake
*/
atomic_set(&cpu1_wakeup, 1);
return ret;
}
static void exynos_pre_enter_aftr(void)
{
__raw_writel(virt_to_phys(exynos_cpu_resume), cpu_boot_reg_base());
}
static void exynos_post_enter_aftr(void)
{
atomic_set(&cpu1_wakeup, 0);
}
struct cpuidle_exynos_data cpuidle_coupled_exynos_data = {
.cpu0_enter_aftr = exynos_cpu0_enter_aftr,
.cpu1_powerdown = exynos_cpu1_powerdown,
.pre_enter_aftr = exynos_pre_enter_aftr,
.post_enter_aftr = exynos_post_enter_aftr,
};
#endif /* CONFIG_SMP && CONFIG_ARM_EXYNOS_CPUIDLE */