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linux/arch/arm/mach-shmobile/pm-sh7372.c
Magnus Damm e26f406740 ARM: shmobile: Rework sh7372 sleep code to use virt_to_phys() 
Instead of having a hard coded virt-to-phys address
conversion code in sleep-sh7372.S, rework the code
to do the conversion in C using virt_to_phys().

This removes the need for PLAT_PHYS_OFFSET which
in turn is needed for ARCH_MULTIPLATFORM.

Signed-off-by: Magnus Damm <damm@opensource.se>
[horms+renesas@verge.net.au: squashed in build fix posted as
 "ARM: shmobile: sh7372 build fix for SUSPEND=n && CPU_IDLE=n"]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
2013-06-17 16:06:47 +09:00

541 lines
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/*
* sh7372 Power management support
*
* Copyright (C) 2011 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_clock.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/bitrev.h>
#include <linux/console.h>
#include <asm/cpuidle.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <asm/suspend.h>
#include <mach/common.h>
#include <mach/sh7372.h>
#include <mach/pm-rmobile.h>
/* DBG */
#define DBGREG1 IOMEM(0xe6100020)
#define DBGREG9 IOMEM(0xe6100040)
/* CPGA */
#define SYSTBCR IOMEM(0xe6150024)
#define MSTPSR0 IOMEM(0xe6150030)
#define MSTPSR1 IOMEM(0xe6150038)
#define MSTPSR2 IOMEM(0xe6150040)
#define MSTPSR3 IOMEM(0xe6150048)
#define MSTPSR4 IOMEM(0xe615004c)
#define PLLC01STPCR IOMEM(0xe61500c8)
/* SYSC */
#define SBAR IOMEM(0xe6180020)
#define WUPRMSK IOMEM(0xe6180028)
#define WUPSMSK IOMEM(0xe618002c)
#define WUPSMSK2 IOMEM(0xe6180048)
#define WUPSFAC IOMEM(0xe6180098)
#define IRQCR IOMEM(0xe618022c)
#define IRQCR2 IOMEM(0xe6180238)
#define IRQCR3 IOMEM(0xe6180244)
#define IRQCR4 IOMEM(0xe6180248)
#define PDNSEL IOMEM(0xe6180254)
/* INTC */
#define ICR1A IOMEM(0xe6900000)
#define ICR2A IOMEM(0xe6900004)
#define ICR3A IOMEM(0xe6900008)
#define ICR4A IOMEM(0xe690000c)
#define INTMSK00A IOMEM(0xe6900040)
#define INTMSK10A IOMEM(0xe6900044)
#define INTMSK20A IOMEM(0xe6900048)
#define INTMSK30A IOMEM(0xe690004c)
/* MFIS */
/* FIXME: pointing where? */
#define SMFRAM 0xe6a70000
/* AP-System Core */
#define APARMBAREA IOMEM(0xe6f10020)
#ifdef CONFIG_PM
#define PM_DOMAIN_ON_OFF_LATENCY_NS 250000
static int sh7372_a4r_pd_suspend(void)
{
sh7372_intcs_suspend();
__raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
return 0;
}
static bool a4s_suspend_ready;
static int sh7372_a4s_pd_suspend(void)
{
/*
* The A4S domain contains the CPU core and therefore it should
* only be turned off if the CPU is not in use. This may happen
* during system suspend, when SYSC is going to be used for generating
* resume signals and a4s_suspend_ready is set to let
* sh7372_enter_suspend() know that it can turn A4S off.
*/
a4s_suspend_ready = true;
return -EBUSY;
}
static void sh7372_a4s_pd_resume(void)
{
a4s_suspend_ready = false;
}
static int sh7372_a3sp_pd_suspend(void)
{
/*
* Serial consoles make use of SCIF hardware located in A3SP,
* keep such power domain on if "no_console_suspend" is set.
*/
return console_suspend_enabled ? 0 : -EBUSY;
}
static struct rmobile_pm_domain sh7372_pm_domains[] = {
{
.genpd.name = "A4LC",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 1,
},
{
.genpd.name = "A4MP",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 2,
},
{
.genpd.name = "D4",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 3,
},
{
.genpd.name = "A4R",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 5,
.suspend = sh7372_a4r_pd_suspend,
.resume = sh7372_intcs_resume,
},
{
.genpd.name = "A3RV",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 6,
},
{
.genpd.name = "A3RI",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 8,
},
{
.genpd.name = "A4S",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 10,
.gov = &pm_domain_always_on_gov,
.no_debug = true,
.suspend = sh7372_a4s_pd_suspend,
.resume = sh7372_a4s_pd_resume,
},
{
.genpd.name = "A3SP",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 11,
.gov = &pm_domain_always_on_gov,
.no_debug = true,
.suspend = sh7372_a3sp_pd_suspend,
},
{
.genpd.name = "A3SG",
.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
.bit_shift = 13,
},
};
void __init sh7372_init_pm_domains(void)
{
rmobile_init_domains(sh7372_pm_domains, ARRAY_SIZE(sh7372_pm_domains));
pm_genpd_add_subdomain_names("A4LC", "A3RV");
pm_genpd_add_subdomain_names("A4R", "A4LC");
pm_genpd_add_subdomain_names("A4S", "A3SG");
pm_genpd_add_subdomain_names("A4S", "A3SP");
}
#endif /* CONFIG_PM */
#if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE)
static void sh7372_set_reset_vector(unsigned long address)
{
/* set reset vector, translate 4k */
__raw_writel(address, SBAR);
__raw_writel(0, APARMBAREA);
}
static void sh7372_enter_sysc(int pllc0_on, unsigned long sleep_mode)
{
if (pllc0_on)
__raw_writel(0, PLLC01STPCR);
else
__raw_writel(1 << 28, PLLC01STPCR);
__raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
cpu_suspend(sleep_mode, sh7372_do_idle_sysc);
__raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */
/* disable reset vector translation */
__raw_writel(0, SBAR);
}
static int sh7372_sysc_valid(unsigned long *mskp, unsigned long *msk2p)
{
unsigned long mstpsr0, mstpsr1, mstpsr2, mstpsr3, mstpsr4;
unsigned long msk, msk2;
/* check active clocks to determine potential wakeup sources */
mstpsr0 = __raw_readl(MSTPSR0);
if ((mstpsr0 & 0x00000003) != 0x00000003) {
pr_debug("sh7372 mstpsr0 0x%08lx\n", mstpsr0);
return 0;
}
mstpsr1 = __raw_readl(MSTPSR1);
if ((mstpsr1 & 0xff079b7f) != 0xff079b7f) {
pr_debug("sh7372 mstpsr1 0x%08lx\n", mstpsr1);
return 0;
}
mstpsr2 = __raw_readl(MSTPSR2);
if ((mstpsr2 & 0x000741ff) != 0x000741ff) {
pr_debug("sh7372 mstpsr2 0x%08lx\n", mstpsr2);
return 0;
}
mstpsr3 = __raw_readl(MSTPSR3);
if ((mstpsr3 & 0x1a60f010) != 0x1a60f010) {
pr_debug("sh7372 mstpsr3 0x%08lx\n", mstpsr3);
return 0;
}
mstpsr4 = __raw_readl(MSTPSR4);
if ((mstpsr4 & 0x00008cf0) != 0x00008cf0) {
pr_debug("sh7372 mstpsr4 0x%08lx\n", mstpsr4);
return 0;
}
msk = 0;
msk2 = 0;
/* make bitmaps of limited number of wakeup sources */
if ((mstpsr2 & (1 << 23)) == 0) /* SPU2 */
msk |= 1 << 31;
if ((mstpsr2 & (1 << 12)) == 0) /* MFI_MFIM */
msk |= 1 << 21;
if ((mstpsr4 & (1 << 3)) == 0) /* KEYSC */
msk |= 1 << 2;
if ((mstpsr1 & (1 << 24)) == 0) /* CMT0 */
msk |= 1 << 1;
if ((mstpsr3 & (1 << 29)) == 0) /* CMT1 */
msk |= 1 << 1;
if ((mstpsr4 & (1 << 0)) == 0) /* CMT2 */
msk |= 1 << 1;
if ((mstpsr2 & (1 << 13)) == 0) /* MFI_MFIS */
msk2 |= 1 << 17;
*mskp = msk;
*msk2p = msk2;
return 1;
}
static void sh7372_icr_to_irqcr(unsigned long icr, u16 *irqcr1p, u16 *irqcr2p)
{
u16 tmp, irqcr1, irqcr2;
int k;
irqcr1 = 0;
irqcr2 = 0;
/* convert INTCA ICR register layout to SYSC IRQCR+IRQCR2 */
for (k = 0; k <= 7; k++) {
tmp = (icr >> ((7 - k) * 4)) & 0xf;
irqcr1 |= (tmp & 0x03) << (k * 2);
irqcr2 |= (tmp >> 2) << (k * 2);
}
*irqcr1p = irqcr1;
*irqcr2p = irqcr2;
}
static void sh7372_setup_sysc(unsigned long msk, unsigned long msk2)
{
u16 irqcrx_low, irqcrx_high, irqcry_low, irqcry_high;
unsigned long tmp;
/* read IRQ0A -> IRQ15A mask */
tmp = bitrev8(__raw_readb(INTMSK00A));
tmp |= bitrev8(__raw_readb(INTMSK10A)) << 8;
/* setup WUPSMSK from clocks and external IRQ mask */
msk = (~msk & 0xc030000f) | (tmp << 4);
__raw_writel(msk, WUPSMSK);
/* propage level/edge trigger for external IRQ 0->15 */
sh7372_icr_to_irqcr(__raw_readl(ICR1A), &irqcrx_low, &irqcry_low);
sh7372_icr_to_irqcr(__raw_readl(ICR2A), &irqcrx_high, &irqcry_high);
__raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR);
__raw_writel((irqcry_high << 16) | irqcry_low, IRQCR2);
/* read IRQ16A -> IRQ31A mask */
tmp = bitrev8(__raw_readb(INTMSK20A));
tmp |= bitrev8(__raw_readb(INTMSK30A)) << 8;
/* setup WUPSMSK2 from clocks and external IRQ mask */
msk2 = (~msk2 & 0x00030000) | tmp;
__raw_writel(msk2, WUPSMSK2);
/* propage level/edge trigger for external IRQ 16->31 */
sh7372_icr_to_irqcr(__raw_readl(ICR3A), &irqcrx_low, &irqcry_low);
sh7372_icr_to_irqcr(__raw_readl(ICR4A), &irqcrx_high, &irqcry_high);
__raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR3);
__raw_writel((irqcry_high << 16) | irqcry_low, IRQCR4);
}
static void sh7372_enter_a3sm_common(int pllc0_on)
{
/* use INTCA together with SYSC for wakeup */
sh7372_setup_sysc(1 << 0, 0);
sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
sh7372_enter_sysc(pllc0_on, 1 << 12);
}
static void sh7372_enter_a4s_common(int pllc0_on)
{
sh7372_intca_suspend();
sh7372_set_reset_vector(SMFRAM);
sh7372_enter_sysc(pllc0_on, 1 << 10);
sh7372_intca_resume();
}
static void sh7372_pm_setup_smfram(void)
{
/* pass physical address of cpu_resume() to assembly resume code */
sh7372_cpu_resume = virt_to_phys(cpu_resume);
memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
}
#else
static inline void sh7372_pm_setup_smfram(void) {}
#endif /* CONFIG_SUSPEND || CONFIG_CPU_IDLE */
#ifdef CONFIG_CPU_IDLE
static int sh7372_do_idle_core_standby(unsigned long unused)
{
cpu_do_idle(); /* WFI when SYSTBCR == 0x10 -> Core Standby */
return 0;
}
static int sh7372_enter_core_standby(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
/* enter sleep mode with SYSTBCR to 0x10 */
__raw_writel(0x10, SYSTBCR);
cpu_suspend(0, sh7372_do_idle_core_standby);
__raw_writel(0, SYSTBCR);
/* disable reset vector translation */
__raw_writel(0, SBAR);
return 1;
}
static int sh7372_enter_a3sm_pll_on(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
sh7372_enter_a3sm_common(1);
return 2;
}
static int sh7372_enter_a3sm_pll_off(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
sh7372_enter_a3sm_common(0);
return 3;
}
static int sh7372_enter_a4s(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
unsigned long msk, msk2;
if (!sh7372_sysc_valid(&msk, &msk2))
return sh7372_enter_a3sm_pll_off(dev, drv, index);
sh7372_setup_sysc(msk, msk2);
sh7372_enter_a4s_common(0);
return 4;
}
static struct cpuidle_driver sh7372_cpuidle_driver = {
.name = "sh7372_cpuidle",
.owner = THIS_MODULE,
.state_count = 5,
.safe_state_index = 0, /* C1 */
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.name = "C2",
.desc = "Core Standby Mode",
.exit_latency = 10,
.target_residency = 20 + 10,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = sh7372_enter_core_standby,
},
.states[2] = {
.name = "C3",
.desc = "A3SM PLL ON",
.exit_latency = 20,
.target_residency = 30 + 20,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = sh7372_enter_a3sm_pll_on,
},
.states[3] = {
.name = "C4",
.desc = "A3SM PLL OFF",
.exit_latency = 120,
.target_residency = 30 + 120,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = sh7372_enter_a3sm_pll_off,
},
.states[4] = {
.name = "C5",
.desc = "A4S PLL OFF",
.exit_latency = 240,
.target_residency = 30 + 240,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = sh7372_enter_a4s,
.disabled = true,
},
};
static void __init sh7372_cpuidle_init(void)
{
shmobile_cpuidle_set_driver(&sh7372_cpuidle_driver);
}
#else
static void __init sh7372_cpuidle_init(void) {}
#endif
#ifdef CONFIG_SUSPEND
static int sh7372_enter_suspend(suspend_state_t suspend_state)
{
unsigned long msk, msk2;
/* check active clocks to determine potential wakeup sources */
if (sh7372_sysc_valid(&msk, &msk2) && a4s_suspend_ready) {
/* convert INTC mask/sense to SYSC mask/sense */
sh7372_setup_sysc(msk, msk2);
/* enter A4S sleep with PLLC0 off */
pr_debug("entering A4S\n");
sh7372_enter_a4s_common(0);
return 0;
}
/* default to enter A3SM sleep with PLLC0 off */
pr_debug("entering A3SM\n");
sh7372_enter_a3sm_common(0);
return 0;
}
/**
* sh7372_pm_notifier_fn - SH7372 PM notifier routine.
* @notifier: Unused.
* @pm_event: Event being handled.
* @unused: Unused.
*/
static int sh7372_pm_notifier_fn(struct notifier_block *notifier,
unsigned long pm_event, void *unused)
{
switch (pm_event) {
case PM_SUSPEND_PREPARE:
/*
* This is necessary, because the A4R domain has to be "on"
* when suspend_device_irqs() and resume_device_irqs() are
* executed during system suspend and resume, respectively, so
* that those functions don't crash while accessing the INTCS.
*/
pm_genpd_name_poweron("A4R");
break;
case PM_POST_SUSPEND:
pm_genpd_poweroff_unused();
break;
}
return NOTIFY_DONE;
}
static void sh7372_suspend_init(void)
{
shmobile_suspend_ops.enter = sh7372_enter_suspend;
pm_notifier(sh7372_pm_notifier_fn, 0);
}
#else
static void sh7372_suspend_init(void) {}
#endif
void __init sh7372_pm_init(void)
{
/* enable DBG hardware block to kick SYSC */
__raw_writel(0x0000a500, DBGREG9);
__raw_writel(0x0000a501, DBGREG9);
__raw_writel(0x00000000, DBGREG1);
/* do not convert A3SM, A3SP, A3SG, A4R power down into A4S */
__raw_writel(0, PDNSEL);
sh7372_pm_setup_smfram();
sh7372_suspend_init();
sh7372_cpuidle_init();
}
void __init sh7372_pm_init_late(void)
{
shmobile_init_late();
pm_genpd_name_attach_cpuidle("A4S", 4);
}
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