arch/arm/mach-shmobile/pm-sh7372.c - kernel/mindspeed - Git at Google

 /*
  * 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/system.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <asm/suspend.h>
 #include <mach/common.h>
 #include <mach/sh7372.h>

 /* DBG */
 #define DBGREG1 0xe6100020
 #define DBGREG9 0xe6100040

 /* CPGA */
 #define SYSTBCR 0xe6150024
 #define MSTPSR0 0xe6150030
 #define MSTPSR1 0xe6150038
 #define MSTPSR2 0xe6150040
 #define MSTPSR3 0xe6150048
 #define MSTPSR4 0xe615004c
 #define PLLC01STPCR 0xe61500c8

 /* SYSC */
 #define SPDCR 0xe6180008
 #define SWUCR 0xe6180014
 #define SBAR 0xe6180020
 #define WUPRMSK 0xe6180028
 #define WUPSMSK 0xe618002c
 #define WUPSMSK2 0xe6180048
 #define PSTR 0xe6180080
 #define WUPSFAC 0xe6180098
 #define IRQCR 0xe618022c
 #define IRQCR2 0xe6180238
 #define IRQCR3 0xe6180244
 #define IRQCR4 0xe6180248
 #define PDNSEL 0xe6180254

 /* INTC */
 #define ICR1A 0xe6900000
 #define ICR2A 0xe6900004
 #define ICR3A 0xe6900008
 #define ICR4A 0xe690000c
 #define INTMSK00A 0xe6900040
 #define INTMSK10A 0xe6900044
 #define INTMSK20A 0xe6900048
 #define INTMSK30A 0xe690004c

 /* MFIS */
 #define SMFRAM 0xe6a70000

 /* AP-System Core */
 #define APARMBAREA 0xe6f10020

 #define PSTR_RETRIES 100
 #define PSTR_DELAY_US 10

 #ifdef CONFIG_PM

 static int pd_power_down(struct generic_pm_domain *genpd)
 {
 	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
 	unsigned int mask = 1 << sh7372_pd->bit_shift;

 	if (sh7372_pd->suspend)
 		sh7372_pd->suspend();

 	if (sh7372_pd->stay_on)
 		return 0;

 	if (__raw_readl(PSTR) & mask) {
 		unsigned int retry_count;

 		__raw_writel(mask, SPDCR);

 		for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
 			if (!(__raw_readl(SPDCR) & mask))
 				break;
 			cpu_relax();
 		}
 	}

 	if (!sh7372_pd->no_debug)
 		pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
 			 mask, __raw_readl(PSTR));

 	return 0;
 }

 static int __pd_power_up(struct sh7372_pm_domain *sh7372_pd, bool do_resume)
 {
 	unsigned int mask = 1 << sh7372_pd->bit_shift;
 	unsigned int retry_count;
 	int ret = 0;

 	if (sh7372_pd->stay_on)
 		goto out;

 	if (__raw_readl(PSTR) & mask)
 		goto out;

 	__raw_writel(mask, SWUCR);

 	for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
 		if (!(__raw_readl(SWUCR) & mask))
 			break;
 		if (retry_count > PSTR_RETRIES)
 			udelay(PSTR_DELAY_US);
 		else
 			cpu_relax();
 	}
 	if (!retry_count)
 		ret = -EIO;

 	if (!sh7372_pd->no_debug)
 		pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
 			 mask, __raw_readl(PSTR));

  out:
 	if (ret == 0 && sh7372_pd->resume && do_resume)
 		sh7372_pd->resume();

 	return ret;
 }

 static int pd_power_up(struct generic_pm_domain *genpd)
 {
 	 return __pd_power_up(to_sh7372_pd(genpd), true);
 }

 static void sh7372_a4r_suspend(void)
 {
 	sh7372_intcs_suspend();
 	__raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
 }

 static bool pd_active_wakeup(struct device *dev)
 {
 	return true;
 }

 static bool sh7372_power_down_forbidden(struct dev_pm_domain *domain)
 {
 	return false;
 }

 struct dev_power_governor sh7372_always_on_gov = {
 	.power_down_ok = sh7372_power_down_forbidden,
 };

 void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
 {
 	struct generic_pm_domain *genpd = &sh7372_pd->genpd;

 	pm_genpd_init(genpd, sh7372_pd->gov, false);
 	genpd->stop_device = pm_clk_suspend;
 	genpd->start_device = pm_clk_resume;
 	genpd->dev_irq_safe = true;
 	genpd->active_wakeup = pd_active_wakeup;
 	genpd->power_off = pd_power_down;
 	genpd->power_on = pd_power_up;
 	__pd_power_up(sh7372_pd, false);
 }

 void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
 				 struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;

 	pm_genpd_add_device(&sh7372_pd->genpd, dev);
 	if (pm_clk_no_clocks(dev))
 		pm_clk_add(dev, NULL);
 }

 void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
 			     struct sh7372_pm_domain *sh7372_sd)
 {
 	pm_genpd_add_subdomain(&sh7372_pd->genpd, &sh7372_sd->genpd);
 }

 struct sh7372_pm_domain sh7372_a4lc = {
 	.bit_shift = 1,
 };

 struct sh7372_pm_domain sh7372_a4mp = {
 	.bit_shift = 2,
 };

 struct sh7372_pm_domain sh7372_d4 = {
 	.bit_shift = 3,
 };

 struct sh7372_pm_domain sh7372_a4r = {
 	.bit_shift = 5,
 	.gov = &sh7372_always_on_gov,
 	.suspend = sh7372_a4r_suspend,
 	.resume = sh7372_intcs_resume,
 	.stay_on = true,
 };

 struct sh7372_pm_domain sh7372_a3rv = {
 	.bit_shift = 6,
 };

 struct sh7372_pm_domain sh7372_a3ri = {
 	.bit_shift = 8,
 };

 struct sh7372_pm_domain sh7372_a3sp = {
 	.bit_shift = 11,
 	.gov = &sh7372_always_on_gov,
 	.no_debug = true,
 };

 static void sh7372_a3sp_init(void)
 {
 	/* serial consoles make use of SCIF hardware located in A3SP,
 	 * keep such power domain on if "no_console_suspend" is set.
 	 */
 	sh7372_a3sp.stay_on = !console_suspend_enabled;
 }

 struct sh7372_pm_domain sh7372_a3sg = {
 	.bit_shift = 13,
 };

 #else /* !CONFIG_PM */

 static inline void sh7372_a3sp_init(void) {}

 #endif /* !CONFIG_PM */

 #if defined(CONFIG_SUSPEND) || defined(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 void sh7372_enter_core_standby(void)
 {
 	/* set reset vector, translate 4k */
 	__raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
 	__raw_writel(0, APARMBAREA);

 	/* 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);
 }
 #endif

 #ifdef CONFIG_SUSPEND
 static void sh7372_enter_a3sm_common(int pllc0_on)
 {
 	/* set reset vector, translate 4k */
 	__raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
 	__raw_writel(0, APARMBAREA);

 	if (pllc0_on)
 		__raw_writel(0, PLLC01STPCR);
 	else
 		__raw_writel(1 << 28, PLLC01STPCR);

 	__raw_writel(0, PDNSEL); /* power-down A3SM only, not A4S */
 	__raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
 	cpu_suspend(0, sh7372_do_idle_a3sm);
 	__raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */

 	 /* disable reset vector translation */
 	__raw_writel(0, SBAR);
 }

 static int sh7372_a3sm_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_a3sm(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);
 }
 #endif

 #ifdef CONFIG_CPU_IDLE

 static void sh7372_cpuidle_setup(struct cpuidle_driver *drv)
 {
 	struct cpuidle_state *state = &drv->states[drv->state_count];

 	snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
 	strncpy(state->desc, "Core Standby Mode", CPUIDLE_DESC_LEN);
 	state->exit_latency = 10;
 	state->target_residency = 20 + 10;
 	state->flags = CPUIDLE_FLAG_TIME_VALID;
 	shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_core_standby;

 	drv->state_count++;
 }

 static void sh7372_cpuidle_init(void)
 {
 	shmobile_cpuidle_setup = sh7372_cpuidle_setup;
 }
 #else
 static void 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_a3sm_valid(&msk, &msk2)) {

 		/* convert INTC mask and sense to SYSC mask and sense */
 		sh7372_setup_a3sm(msk, msk2);

 		/* enter A3SM sleep with PLLC0 off */
 		pr_debug("entering A3SM\n");
 		sh7372_enter_a3sm_common(0);
 	} else {
 		/* default to Core Standby that supports all wakeup sources */
 		pr_debug("entering Core Standby\n");
 		sh7372_enter_core_standby();
 	}
 	return 0;
 }

 static void sh7372_suspend_init(void)
 {
 	shmobile_suspend_ops.enter = sh7372_enter_suspend;
 }
 #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_a3sp_init();

 	sh7372_suspend_init();
 	sh7372_cpuidle_init();
 }
	/*
	* 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/system.h>
	#include <asm/io.h>
	#include <asm/tlbflush.h>
	#include <asm/suspend.h>
	#include <mach/common.h>
	#include <mach/sh7372.h>

	/* DBG */
	#define DBGREG1 0xe6100020
	#define DBGREG9 0xe6100040

	/* CPGA */
	#define SYSTBCR 0xe6150024
	#define MSTPSR0 0xe6150030
	#define MSTPSR1 0xe6150038
	#define MSTPSR2 0xe6150040
	#define MSTPSR3 0xe6150048
	#define MSTPSR4 0xe615004c
	#define PLLC01STPCR 0xe61500c8

	/* SYSC */
	#define SPDCR 0xe6180008
	#define SWUCR 0xe6180014
	#define SBAR 0xe6180020
	#define WUPRMSK 0xe6180028
	#define WUPSMSK 0xe618002c
	#define WUPSMSK2 0xe6180048
	#define PSTR 0xe6180080
	#define WUPSFAC 0xe6180098
	#define IRQCR 0xe618022c
	#define IRQCR2 0xe6180238
	#define IRQCR3 0xe6180244
	#define IRQCR4 0xe6180248
	#define PDNSEL 0xe6180254

	/* INTC */
	#define ICR1A 0xe6900000
	#define ICR2A 0xe6900004
	#define ICR3A 0xe6900008
	#define ICR4A 0xe690000c
	#define INTMSK00A 0xe6900040
	#define INTMSK10A 0xe6900044
	#define INTMSK20A 0xe6900048
	#define INTMSK30A 0xe690004c

	/* MFIS */
	#define SMFRAM 0xe6a70000

	/* AP-System Core */
	#define APARMBAREA 0xe6f10020

	#define PSTR_RETRIES 100
	#define PSTR_DELAY_US 10

	#ifdef CONFIG_PM

	static int pd_power_down(struct generic_pm_domain *genpd)
	{
	struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
	unsigned int mask = 1 << sh7372_pd->bit_shift;

	if (sh7372_pd->suspend)
	sh7372_pd->suspend();

	if (sh7372_pd->stay_on)
	return 0;

	if (__raw_readl(PSTR) & mask) {
	unsigned int retry_count;

	__raw_writel(mask, SPDCR);

	for (retry_count = PSTR_RETRIES; retry_count; retry_count--) {
	if (!(__raw_readl(SPDCR) & mask))
	break;
	cpu_relax();
	}
	}

	if (!sh7372_pd->no_debug)
	pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
	mask, __raw_readl(PSTR));

	return 0;
	}

	static int __pd_power_up(struct sh7372_pm_domain *sh7372_pd, bool do_resume)
	{
	unsigned int mask = 1 << sh7372_pd->bit_shift;
	unsigned int retry_count;
	int ret = 0;

	if (sh7372_pd->stay_on)
	goto out;

	if (__raw_readl(PSTR) & mask)
	goto out;

	__raw_writel(mask, SWUCR);

	for (retry_count = 2 * PSTR_RETRIES; retry_count; retry_count--) {
	if (!(__raw_readl(SWUCR) & mask))
	break;
	if (retry_count > PSTR_RETRIES)
	udelay(PSTR_DELAY_US);
	else
	cpu_relax();
	}
	if (!retry_count)
	ret = -EIO;

	if (!sh7372_pd->no_debug)
	pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
	mask, __raw_readl(PSTR));

	out:
	if (ret == 0 && sh7372_pd->resume && do_resume)
	sh7372_pd->resume();

	return ret;
	}

	static int pd_power_up(struct generic_pm_domain *genpd)
	{
	return __pd_power_up(to_sh7372_pd(genpd), true);
	}

	static void sh7372_a4r_suspend(void)
	{
	sh7372_intcs_suspend();
	__raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
	}

	static bool pd_active_wakeup(struct device *dev)
	{
	return true;
	}

	static bool sh7372_power_down_forbidden(struct dev_pm_domain *domain)
	{
	return false;
	}

	struct dev_power_governor sh7372_always_on_gov = {
	.power_down_ok = sh7372_power_down_forbidden,
	};

	void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
	{
	struct generic_pm_domain *genpd = &sh7372_pd->genpd;

	pm_genpd_init(genpd, sh7372_pd->gov, false);
	genpd->stop_device = pm_clk_suspend;
	genpd->start_device = pm_clk_resume;
	genpd->dev_irq_safe = true;
	genpd->active_wakeup = pd_active_wakeup;
	genpd->power_off = pd_power_down;
	genpd->power_on = pd_power_up;
	__pd_power_up(sh7372_pd, false);
	}

	void sh7372_add_device_to_domain(struct sh7372_pm_domain *sh7372_pd,
	struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;

	pm_genpd_add_device(&sh7372_pd->genpd, dev);
	if (pm_clk_no_clocks(dev))
	pm_clk_add(dev, NULL);
	}

	void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
	struct sh7372_pm_domain *sh7372_sd)
	{
	pm_genpd_add_subdomain(&sh7372_pd->genpd, &sh7372_sd->genpd);
	}

	struct sh7372_pm_domain sh7372_a4lc = {
	.bit_shift = 1,
	};

	struct sh7372_pm_domain sh7372_a4mp = {
	.bit_shift = 2,
	};

	struct sh7372_pm_domain sh7372_d4 = {
	.bit_shift = 3,
	};

	struct sh7372_pm_domain sh7372_a4r = {
	.bit_shift = 5,
	.gov = &sh7372_always_on_gov,
	.suspend = sh7372_a4r_suspend,
	.resume = sh7372_intcs_resume,
	.stay_on = true,
	};

	struct sh7372_pm_domain sh7372_a3rv = {
	.bit_shift = 6,
	};

	struct sh7372_pm_domain sh7372_a3ri = {
	.bit_shift = 8,
	};

	struct sh7372_pm_domain sh7372_a3sp = {
	.bit_shift = 11,
	.gov = &sh7372_always_on_gov,
	.no_debug = true,
	};

	static void sh7372_a3sp_init(void)
	{
	/* serial consoles make use of SCIF hardware located in A3SP,
	* keep such power domain on if "no_console_suspend" is set.
	*/
	sh7372_a3sp.stay_on = !console_suspend_enabled;
	}

	struct sh7372_pm_domain sh7372_a3sg = {
	.bit_shift = 13,
	};

	#else /* !CONFIG_PM */

	static inline void sh7372_a3sp_init(void) {}

	#endif /* !CONFIG_PM */

	#if defined(CONFIG_SUSPEND) \|\| defined(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 void sh7372_enter_core_standby(void)
	{
	/* set reset vector, translate 4k */
	__raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
	__raw_writel(0, APARMBAREA);

	/* 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);
	}
	#endif

	#ifdef CONFIG_SUSPEND
	static void sh7372_enter_a3sm_common(int pllc0_on)
	{
	/* set reset vector, translate 4k */
	__raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
	__raw_writel(0, APARMBAREA);

	if (pllc0_on)
	__raw_writel(0, PLLC01STPCR);
	else
	__raw_writel(1 << 28, PLLC01STPCR);

	__raw_writel(0, PDNSEL); /* power-down A3SM only, not A4S */
	__raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
	cpu_suspend(0, sh7372_do_idle_a3sm);
	__raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */

	/* disable reset vector translation */
	__raw_writel(0, SBAR);
	}

	static int sh7372_a3sm_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_a3sm(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);
	}
	#endif

	#ifdef CONFIG_CPU_IDLE

	static void sh7372_cpuidle_setup(struct cpuidle_driver *drv)
	{
	struct cpuidle_state *state = &drv->states[drv->state_count];

	snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
	strncpy(state->desc, "Core Standby Mode", CPUIDLE_DESC_LEN);
	state->exit_latency = 10;
	state->target_residency = 20 + 10;
	state->flags = CPUIDLE_FLAG_TIME_VALID;
	shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_core_standby;

	drv->state_count++;
	}

	static void sh7372_cpuidle_init(void)
	{
	shmobile_cpuidle_setup = sh7372_cpuidle_setup;
	}
	#else
	static void 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_a3sm_valid(&msk, &msk2)) {

	/* convert INTC mask and sense to SYSC mask and sense */
	sh7372_setup_a3sm(msk, msk2);

	/* enter A3SM sleep with PLLC0 off */
	pr_debug("entering A3SM\n");
	sh7372_enter_a3sm_common(0);
	} else {
	/* default to Core Standby that supports all wakeup sources */
	pr_debug("entering Core Standby\n");
	sh7372_enter_core_standby();
	}
	return 0;
	}

	static void sh7372_suspend_init(void)
	{
	shmobile_suspend_ops.enter = sh7372_enter_suspend;
	}
	#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_a3sp_init();

	sh7372_suspend_init();
	sh7372_cpuidle_init();
	}