linux/arch/arm/mach-exynos/pm.c
Linus Torvalds b3345d7c57 ARM: SoC platform changes for 3.17
This is the bulk of new SoC enablement and other platform changes for 3.17:
 
 * Samsung S5PV210 has been converted to DT and multiplatform
 * Clock drivers and bindings for some of the lower-end i.MX 1/2 platforms
 * Kirkwood, one of the popular Marvell platforms, is folded into the
   mvebu platform code, removing mach-kirkwood.
 * Hwmod data for TI AM43xx and DRA7 platforms.
 * More additions of Renesas shmobile platform support
 * Removal of plat-samsung contents that can be removed with S5PV210 being
   multiplatform/DT-enabled and the other two old platforms being removed.
 
 New platforms (most with only basic support right now):
 
 * Hisilicon X5HD2 settop box chipset is introduced
 * Mediatek MT6589 (mobile chipset) is introduced
 * Broadcom BCM7xxx settop box chipset is introduced
 
 + as usual a lot other pieces all over the platform code.
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Merge tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC platform changes from Olof Johansson:
 "This is the bulk of new SoC enablement and other platform changes for
  3.17:

   - Samsung S5PV210 has been converted to DT and multiplatform
   - Clock drivers and bindings for some of the lower-end i.MX 1/2
     platforms
   - Kirkwood, one of the popular Marvell platforms, is folded into the
     mvebu platform code, removing mach-kirkwood
   - Hwmod data for TI AM43xx and DRA7 platforms
   - More additions of Renesas shmobile platform support
   - Removal of plat-samsung contents that can be removed with S5PV210
     being multiplatform/DT-enabled and the other two old platforms
     being removed

  New platforms (most with only basic support right now):

   - Hisilicon X5HD2 settop box chipset is introduced
   - Mediatek MT6589 (mobile chipset) is introduced
   - Broadcom BCM7xxx settop box chipset is introduced

  + as usual a lot other pieces all over the platform code"

* tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (240 commits)
  ARM: hisi: remove smp from machine descriptor
  power: reset: move hisilicon reboot code
  ARM: dts: Add hix5hd2-dkb dts file.
  ARM: debug: Rename Hi3716 to HIX5HD2
  ARM: hisi: enable hix5hd2 SoC
  ARM: hisi: add ARCH_HISI
  MAINTAINERS: add entry for Broadcom ARM STB architecture
  ARM: brcmstb: select GISB arbiter and interrupt drivers
  ARM: brcmstb: add infrastructure for ARM-based Broadcom STB SoCs
  ARM: configs: enable SMP in bcm_defconfig
  ARM: add SMP support for Broadcom mobile SoCs
  Documentation: arm: misc updates to Marvell EBU SoC status
  Documentation: arm: add URLs to public datasheets for the Marvell Armada XP SoC
  ARM: mvebu: fix build without platforms selected
  ARM: mvebu: add cpuidle support for Armada 38x
  ARM: mvebu: add cpuidle support for Armada 370
  cpuidle: mvebu: add Armada 38x support
  cpuidle: mvebu: add Armada 370 support
  cpuidle: mvebu: rename the driver from armada-370-xp to mvebu-v7
  ARM: mvebu: export the SCU address
  ...
2014-08-08 11:14:29 -07:00

421 lines
9.5 KiB
C

/*
* 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/cpu_pm.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic.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 <asm/suspend.h>
#include <plat/pm-common.h>
#include <plat/regs-srom.h>
#include <mach/map.h>
#include "common.h"
#include "regs-pmu.h"
#include "regs-sys.h"
/**
* struct exynos_wkup_irq - Exynos GIC to PMU IRQ mapping
* @hwirq: Hardware IRQ signal of the GIC
* @mask: Mask in PMU wake-up mask register
*/
struct exynos_wkup_irq {
unsigned int hwirq;
u32 mask;
};
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),
};
/*
* GIC wake-up support
*/
static u32 exynos_irqwake_intmask = 0xffffffff;
static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
{ 76, BIT(1) }, /* RTC alarm */
{ 77, BIT(2) }, /* RTC tick */
{ /* sentinel */ },
};
static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
{ 75, BIT(1) }, /* RTC alarm */
{ 76, BIT(2) }, /* RTC tick */
{ /* sentinel */ },
};
static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
{
const struct exynos_wkup_irq *wkup_irq;
if (soc_is_exynos5250())
wkup_irq = exynos5250_wkup_irq;
else
wkup_irq = exynos4_wkup_irq;
while (wkup_irq->mask) {
if (wkup_irq->hwirq == data->hwirq) {
if (!state)
exynos_irqwake_intmask |= wkup_irq->mask;
else
exynos_irqwake_intmask &= ~wkup_irq->mask;
return 0;
}
++wkup_irq;
}
return -ENOENT;
}
#define EXYNOS_BOOT_VECTOR_ADDR (samsung_rev() == EXYNOS4210_REV_1_1 ? \
pmu_base_addr + S5P_INFORM7 : \
(samsung_rev() == EXYNOS4210_REV_1_0 ? \
(sysram_base_addr + 0x24) : \
pmu_base_addr + S5P_INFORM0))
#define EXYNOS_BOOT_VECTOR_FLAG (samsung_rev() == EXYNOS4210_REV_1_1 ? \
pmu_base_addr + S5P_INFORM6 : \
(samsung_rev() == EXYNOS4210_REV_1_0 ? \
(sysram_base_addr + 0x20) : \
pmu_base_addr + S5P_INFORM1))
#define S5P_CHECK_AFTR 0xFCBA0D10
#define S5P_CHECK_SLEEP 0x00000BAD
/* 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);
}
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);
}
void exynos_enter_aftr(void)
{
exynos_set_wakeupmask(0x0000ff3e);
exynos_cpu_set_boot_vector(S5P_CHECK_AFTR);
/* Set value of power down register for aftr mode */
exynos_sys_powerdown_conf(SYS_AFTR);
}
/* For Cortex-A9 Diagnostic and Power control register */
static unsigned int save_arm_register[2];
static 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;
}
static 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");
}
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();
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void exynos_pm_prepare(void)
{
unsigned int tmp;
/* Set wake-up mask registers */
pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
if (soc_is_exynos5250()) {
s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save));
/* Disable USE_RETENTION of JPEG_MEM_OPTION */
tmp = pmu_raw_readl(EXYNOS5_JPEG_MEM_OPTION);
tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
pmu_raw_writel(tmp, EXYNOS5_JPEG_MEM_OPTION);
}
/* Set value of power down register for sleep mode */
exynos_sys_powerdown_conf(SYS_SLEEP);
pmu_raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
/* ensure at least INFORM0 has the resume address */
pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
}
static 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);
}
static int exynos_pm_suspend(void)
{
unsigned long tmp;
exynos_pm_central_suspend();
/* Setting SEQ_OPTION register */
tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
pmu_raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
exynos_cpu_save_register();
return 0;
}
static 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;
}
static void exynos_pm_resume(void)
{
if (exynos_pm_central_resume())
goto early_wakeup;
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
exynos_cpu_restore_register();
/* For release retention */
pmu_raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
pmu_raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
pmu_raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
pmu_raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
pmu_raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
pmu_raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
pmu_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 (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
scu_enable(S5P_VA_SCU);
early_wakeup:
/* Clear SLEEP mode set in INFORM1 */
pmu_raw_writel(0x0, S5P_INFORM1);
return;
}
static struct syscore_ops exynos_pm_syscore_ops = {
.suspend = exynos_pm_suspend,
.resume = exynos_pm_resume,
};
/*
* Suspend Ops
*/
static int exynos_suspend_enter(suspend_state_t state)
{
int ret;
s3c_pm_debug_init();
S3C_PMDBG("%s: suspending the system...\n", __func__);
S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
exynos_irqwake_intmask, exynos_get_eint_wake_mask());
if (exynos_irqwake_intmask == -1U
&& exynos_get_eint_wake_mask() == -1U) {
pr_err("%s: No wake-up sources!\n", __func__);
pr_err("%s: Aborting sleep\n", __func__);
return -EINVAL;
}
s3c_pm_save_uarts();
exynos_pm_prepare();
flush_cache_all();
s3c_pm_check_store();
ret = cpu_suspend(0, exynos_cpu_suspend);
if (ret)
return ret;
s3c_pm_restore_uarts();
S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
pmu_raw_readl(S5P_WAKEUP_STAT));
s3c_pm_check_restore();
S3C_PMDBG("%s: resuming the system...\n", __func__);
return 0;
}
static int exynos_suspend_prepare(void)
{
s3c_pm_check_prepare();
return 0;
}
static void exynos_suspend_finish(void)
{
s3c_pm_check_cleanup();
}
static const struct platform_suspend_ops exynos_suspend_ops = {
.enter = exynos_suspend_enter,
.prepare = exynos_suspend_prepare,
.finish = exynos_suspend_finish,
.valid = suspend_valid_only_mem,
};
static int exynos_cpu_pm_notifier(struct notifier_block *self,
unsigned long cmd, void *v)
{
int cpu = smp_processor_id();
switch (cmd) {
case CPU_PM_ENTER:
if (cpu == 0) {
exynos_pm_central_suspend();
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
exynos_cpu_save_register();
}
break;
case CPU_PM_EXIT:
if (cpu == 0) {
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
scu_enable(S5P_VA_SCU);
exynos_cpu_restore_register();
}
exynos_pm_central_resume();
}
break;
}
return NOTIFY_OK;
}
static struct notifier_block exynos_cpu_pm_notifier_block = {
.notifier_call = exynos_cpu_pm_notifier,
};
void __init exynos_pm_init(void)
{
u32 tmp;
cpu_pm_register_notifier(&exynos_cpu_pm_notifier_block);
/* Platform-specific GIC callback */
gic_arch_extn.irq_set_wake = exynos_irq_set_wake;
/* All wakeup disable */
tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
tmp |= ((0xFF << 8) | (0x1F << 1));
pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
register_syscore_ops(&exynos_pm_syscore_ops);
suspend_set_ops(&exynos_suspend_ops);
}