arch/arm/mach-omap2/omap-wakeupgen.c - kernel/panda - Git at Google

 /*
  * OMAP WakeupGen Source file
  *
  * OMAP WakeupGen is the interrupt controller extension used along
  * with ARM GIC to wake the CPU out from low power states on
  * external interrupts. It is responsible for generating wakeup
  * event from the incoming interrupts and enable bits. It is
  * implemented in MPU always ON power domain. During normal operation,
  * WakeupGen delivers external interrupts directly to the GIC.
  *
  * Copyright (C) 2011 Texas Instruments, Inc.
  *	Santosh Shilimkar <santosh.shilimkar@ti.com>
  *
  * 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/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/cpu_pm.h>

 #include <asm/hardware/gic.h>

 #include <mach/omap-wakeupgen.h>
 #include <mach/omap4-common.h>
 #include <mach/omap-secure.h>

 #include "omap4-sar-layout.h"

 #define NR_BANKS		4
 #define MAX_IRQS		128
 #define WKG_MASK_ALL		0x00000000
 #define WKG_UNMASK_ALL		0xffffffff
 #define CPU_ENA_OFFSET		0x400
 #define CPU0_ID			0x0
 #define CPU1_ID			0x1

 static void __iomem *wakeupgen_base;
 static void __iomem *sar_base;
 static DEFINE_PER_CPU(u32 [NR_BANKS], irqmasks);
 static DEFINE_SPINLOCK(wakeupgen_lock);
 static unsigned int irq_target_cpu[NR_IRQS];

 /*
  * Static helper functions.
  */
 static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
 {
 	return __raw_readl(wakeupgen_base + OMAP_WKG_ENB_A_0 +
 				(cpu * CPU_ENA_OFFSET) + (idx * 4));
 }

 static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
 {
 	__raw_writel(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
 				(cpu * CPU_ENA_OFFSET) + (idx * 4));
 }

 static inline void sar_writel(u32 val, u32 offset, u8 idx)
 {
 	__raw_writel(val, sar_base + offset + (idx * 4));
 }

 static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
 {
 	u8 i;

 	for (i = 0; i < NR_BANKS; i++)
 		wakeupgen_writel(reg, i, cpu);
 }

 static inline int _wakeupgen_get_irq_info(u32 irq, u32 *bit_posn, u8 *reg_index)
 {
 	unsigned int spi_irq;

 	/*
 	 * PPIs and SGIs are not supported.
 	 */
 	if (irq < OMAP44XX_IRQ_GIC_START)
 		return -EINVAL;

 	/*
 	 * Subtract the GIC offset.
 	 */
 	spi_irq = irq - OMAP44XX_IRQ_GIC_START;
 	if (spi_irq > MAX_IRQS) {
 		pr_err("omap wakeupGen: Invalid IRQ%d\n", irq);
 		return -EINVAL;
 	}

 	/*
 	 * Each WakeupGen register controls 32 interrupt.
 	 * i.e. 1 bit per SPI IRQ
 	 */
 	*reg_index = spi_irq >> 5;
 	*bit_posn = spi_irq %= 32;

 	return 0;
 }

 static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
 {
 	u32 val, bit_number;
 	u8 i;

 	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
 		return;

 	val = wakeupgen_readl(i, cpu);
 	val &= ~BIT(bit_number);
 	wakeupgen_writel(val, i, cpu);
 }

 static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
 {
 	u32 val, bit_number;
 	u8 i;

 	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
 		return;

 	val = wakeupgen_readl(i, cpu);
 	val |= BIT(bit_number);
 	wakeupgen_writel(val, i, cpu);
 }

 static void _wakeupgen_save_masks(unsigned int cpu)
 {
 	u8 i;

 	for (i = 0; i < NR_BANKS; i++)
 		per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
 }

 static void _wakeupgen_restore_masks(unsigned int cpu)
 {
 	u8 i;

 	for (i = 0; i < NR_BANKS; i++)
 		wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
 }

 /*
  * Architecture specific Mask extension
  */
 static void wakeupgen_mask(struct irq_data *d)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&wakeupgen_lock, flags);
 	_wakeupgen_clear(d->irq, irq_target_cpu[d->irq]);
 	spin_unlock_irqrestore(&wakeupgen_lock, flags);
 }

 /*
  * Architecture specific Unmask extension
  */
 static void wakeupgen_unmask(struct irq_data *d)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&wakeupgen_lock, flags);
 	_wakeupgen_set(d->irq, irq_target_cpu[d->irq]);
 	spin_unlock_irqrestore(&wakeupgen_lock, flags);
 }

 #ifdef CONFIG_PM
 /*
  * Masking wakeup irqs is handled by the IRQCHIP_MASK_ON_SUSPEND flag,
  * so no action is necessary in set_wake, but implement an empty handler
  * here to prevent enable_irq_wake() returning an error.
  * FIXME: Remove the dummy handler once gen irq code fix above.
  */
 static int wakeupgen_set_wake(struct irq_data *d, unsigned int on)
 {
 	return 0;
 }
 #else
 #define wakeupgen_set_wake	NULL
 #endif

 /*
  * Mask or unmask all interrupts on given CPU.
  *	0 = Mask all interrupts on the 'cpu'
  *	1 = Unmask all interrupts on the 'cpu'
  * Ensure that the initial mask is maintained. This is faster than
  * iterating through GIC registers to arrive at the correct masks.
  */
 void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&wakeupgen_lock, flags);
 	if (set) {
 		_wakeupgen_save_masks(cpu);
 		_wakeupgen_set_all(cpu, WKG_MASK_ALL);
 	} else {
 		_wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
 		_wakeupgen_restore_masks(cpu);
 	}
 	spin_unlock_irqrestore(&wakeupgen_lock, flags);
 }

 /*
  * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
  * ROM code. WakeupGen IP is integrated along with GIC to manage the
  * interrupt wakeups from CPU low power states. It manages
  * masking/unmasking of Shared peripheral interrupts(SPI). So the
  * interrupt enable/disable control should be in sync and consistent
  * at WakeupGen and GIC so that interrupts are not lost.
  */
 static void irq_save_context(void)
 {
 	u32 i, val;

 	if (omap_rev() == OMAP4430_REV_ES1_0)
 		return;

 	if (!sar_base)
 		sar_base = omap4_get_sar_ram_base();

 	for (i = 0; i < NR_BANKS; i++) {
 		/* Save the CPUx interrupt mask for IRQ 0 to 127 */
 		val = wakeupgen_readl(i, 0);
 		sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
 		val = wakeupgen_readl(i, 1);
 		sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);

 		/*
 		 * Disable the secure interrupts for CPUx. The restore
 		 * code blindly restores secure and non-secure interrupt
 		 * masks from SAR RAM. Secure interrupts are not suppose
 		 * to be enabled from HLOS. So overwrite the SAR location
 		 * so that the secure interrupt remains disabled.
 		 */
 		sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
 		sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
 	}

 	/* Save AuxBoot* registers */
 	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
 	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);

 	/* Save SyncReq generation logic */
 	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
 	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
 	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);

 	/* Save SyncReq generation logic */
 	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
 	__raw_writel(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
 	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
 	__raw_writel(val, sar_base + PTMSYNCREQ_EN_OFFSET);

 	/* Set the Backup Bit Mask status */
 	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
 	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
 	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
 }

 /*
  * Clear WakeupGen SAR backup status.
  */
 void irq_sar_clear(void)
 {
 	u32 val;
 	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
 	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
 	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
 }

 /*
  * Save GIC and Wakeupgen interrupt context using secure API
  * for HS/EMU devices.
  */
 static void irq_save_secure_context(void)
 {
 	u32 ret;
 	ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
 				FLAG_START_CRITICAL,
 				0, 0, 0, 0, 0);
 	if (ret != API_HAL_RET_VALUE_OK)
 		pr_err("GIC and Wakeupgen context save failed\n");
 }

 #ifdef CONFIG_HOTPLUG_CPU
 static int __cpuinit irq_cpu_hotplug_notify(struct notifier_block *self,
 					 unsigned long action, void *hcpu)
 {
 	unsigned int cpu = (unsigned int)hcpu;

 	switch (action) {
 	case CPU_ONLINE:
 		wakeupgen_irqmask_all(cpu, 0);
 		break;
 	case CPU_DEAD:
 		wakeupgen_irqmask_all(cpu, 1);
 		break;
 	}
 	return NOTIFY_OK;
 }

 static struct notifier_block __refdata irq_hotplug_notifier = {
 	.notifier_call = irq_cpu_hotplug_notify,
 };

 static void __init irq_hotplug_init(void)
 {
 	register_hotcpu_notifier(&irq_hotplug_notifier);
 }
 #else
 static void __init irq_hotplug_init(void)
 {}
 #endif

 #ifdef CONFIG_CPU_PM
 static int irq_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
 {
 	switch (cmd) {
 	case CPU_CLUSTER_PM_ENTER:
 		if (omap_type() == OMAP2_DEVICE_TYPE_GP)
 			irq_save_context();
 		else
 			irq_save_secure_context();
 		break;
 	case CPU_CLUSTER_PM_EXIT:
 		if (omap_type() == OMAP2_DEVICE_TYPE_GP)
 			irq_sar_clear();
 		break;
 	}
 	return NOTIFY_OK;
 }

 static struct notifier_block irq_notifier_block = {
 	.notifier_call = irq_notifier,
 };

 static void __init irq_pm_init(void)
 {
 	cpu_pm_register_notifier(&irq_notifier_block);
 }
 #else
 static void __init irq_pm_init(void)
 {}
 #endif

 /*
  * Initialise the wakeupgen module.
  */
 int __init omap_wakeupgen_init(void)
 {
 	int i;
 	unsigned int boot_cpu = smp_processor_id();

 	/* Not supported on OMAP4 ES1.0 silicon */
 	if (omap_rev() == OMAP4430_REV_ES1_0) {
 		WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
 		return -EPERM;
 	}

 	/* Static mapping, never released */
 	wakeupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
 	if (WARN_ON(!wakeupgen_base))
 		return -ENODEV;

 	/* Clear all IRQ bitmasks at wakeupGen level */
 	for (i = 0; i < NR_BANKS; i++) {
 		wakeupgen_writel(0, i, CPU0_ID);
 		wakeupgen_writel(0, i, CPU1_ID);
 	}

 	/*
 	 * Override GIC architecture specific functions to add
 	 * OMAP WakeupGen interrupt controller along with GIC
 	 */
 	gic_arch_extn.irq_mask = wakeupgen_mask;
 	gic_arch_extn.irq_unmask = wakeupgen_unmask;
 	gic_arch_extn.irq_set_wake = wakeupgen_set_wake;

 	/*
 	 * FIXME: Add support to set_smp_affinity() once the core
 	 * GIC code has necessary hooks in place.
 	 */

 	/* Associate all the IRQs to boot CPU like GIC init does. */
 	for (i = 0; i < NR_IRQS; i++)
 		irq_target_cpu[i] = boot_cpu;

 	irq_hotplug_init();
 	irq_pm_init();

 	return 0;
 }
	/*
	* OMAP WakeupGen Source file
	*
	* OMAP WakeupGen is the interrupt controller extension used along
	* with ARM GIC to wake the CPU out from low power states on
	* external interrupts. It is responsible for generating wakeup
	* event from the incoming interrupts and enable bits. It is
	* implemented in MPU always ON power domain. During normal operation,
	* WakeupGen delivers external interrupts directly to the GIC.
	*
	* Copyright (C) 2011 Texas Instruments, Inc.
	* Santosh Shilimkar <santosh.shilimkar@ti.com>
	*
	* 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/kernel.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/platform_device.h>
	#include <linux/notifier.h>
	#include <linux/cpu.h>
	#include <linux/cpu_pm.h>

	#include <asm/hardware/gic.h>

	#include <mach/omap-wakeupgen.h>
	#include <mach/omap4-common.h>
	#include <mach/omap-secure.h>

	#include "omap4-sar-layout.h"

	#define NR_BANKS 4
	#define MAX_IRQS 128
	#define WKG_MASK_ALL 0x00000000
	#define WKG_UNMASK_ALL 0xffffffff
	#define CPU_ENA_OFFSET 0x400
	#define CPU0_ID 0x0
	#define CPU1_ID 0x1

	static void __iomem *wakeupgen_base;
	static void __iomem *sar_base;
	static DEFINE_PER_CPU(u32 [NR_BANKS], irqmasks);
	static DEFINE_SPINLOCK(wakeupgen_lock);
	static unsigned int irq_target_cpu[NR_IRQS];

	/*
	* Static helper functions.
	*/
	static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
	{
	return __raw_readl(wakeupgen_base + OMAP_WKG_ENB_A_0 +
	(cpu * CPU_ENA_OFFSET) + (idx * 4));
	}

	static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
	{
	__raw_writel(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
	(cpu * CPU_ENA_OFFSET) + (idx * 4));
	}

	static inline void sar_writel(u32 val, u32 offset, u8 idx)
	{
	__raw_writel(val, sar_base + offset + (idx * 4));
	}

	static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
	{
	u8 i;

	for (i = 0; i < NR_BANKS; i++)
	wakeupgen_writel(reg, i, cpu);
	}

	static inline int _wakeupgen_get_irq_info(u32 irq, u32 bit_posn, u8 reg_index)
	{
	unsigned int spi_irq;

	/*
	* PPIs and SGIs are not supported.
	*/
	if (irq < OMAP44XX_IRQ_GIC_START)
	return -EINVAL;

	/*
	* Subtract the GIC offset.
	*/
	spi_irq = irq - OMAP44XX_IRQ_GIC_START;
	if (spi_irq > MAX_IRQS) {
	pr_err("omap wakeupGen: Invalid IRQ%d\n", irq);
	return -EINVAL;
	}

	/*
	* Each WakeupGen register controls 32 interrupt.
	* i.e. 1 bit per SPI IRQ
	*/
	*reg_index = spi_irq >> 5;
	*bit_posn = spi_irq %= 32;

	return 0;
	}

	static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
	{
	u32 val, bit_number;
	u8 i;

	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
	return;

	val = wakeupgen_readl(i, cpu);
	val &= ~BIT(bit_number);
	wakeupgen_writel(val, i, cpu);
	}

	static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
	{
	u32 val, bit_number;
	u8 i;

	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
	return;

	val = wakeupgen_readl(i, cpu);
	val \|= BIT(bit_number);
	wakeupgen_writel(val, i, cpu);
	}

	static void _wakeupgen_save_masks(unsigned int cpu)
	{
	u8 i;

	for (i = 0; i < NR_BANKS; i++)
	per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
	}

	static void _wakeupgen_restore_masks(unsigned int cpu)
	{
	u8 i;

	for (i = 0; i < NR_BANKS; i++)
	wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
	}

	/*
	* Architecture specific Mask extension
	*/
	static void wakeupgen_mask(struct irq_data *d)
	{
	unsigned long flags;

	spin_lock_irqsave(&wakeupgen_lock, flags);
	_wakeupgen_clear(d->irq, irq_target_cpu[d->irq]);
	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	}

	/*
	* Architecture specific Unmask extension
	*/
	static void wakeupgen_unmask(struct irq_data *d)
	{
	unsigned long flags;

	spin_lock_irqsave(&wakeupgen_lock, flags);
	_wakeupgen_set(d->irq, irq_target_cpu[d->irq]);
	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	}

	#ifdef CONFIG_PM
	/*
	* Masking wakeup irqs is handled by the IRQCHIP_MASK_ON_SUSPEND flag,
	* so no action is necessary in set_wake, but implement an empty handler
	* here to prevent enable_irq_wake() returning an error.
	* FIXME: Remove the dummy handler once gen irq code fix above.
	*/
	static int wakeupgen_set_wake(struct irq_data *d, unsigned int on)
	{
	return 0;
	}
	#else
	#define wakeupgen_set_wake NULL
	#endif

	/*
	* Mask or unmask all interrupts on given CPU.
	* 0 = Mask all interrupts on the 'cpu'
	* 1 = Unmask all interrupts on the 'cpu'
	* Ensure that the initial mask is maintained. This is faster than
	* iterating through GIC registers to arrive at the correct masks.
	*/
	void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
	{
	unsigned long flags;

	spin_lock_irqsave(&wakeupgen_lock, flags);
	if (set) {
	_wakeupgen_save_masks(cpu);
	_wakeupgen_set_all(cpu, WKG_MASK_ALL);
	} else {
	_wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
	_wakeupgen_restore_masks(cpu);
	}
	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	}

	/*
	* Save WakeupGen interrupt context in SAR BANK3. Restore is done by
	* ROM code. WakeupGen IP is integrated along with GIC to manage the
	* interrupt wakeups from CPU low power states. It manages
	* masking/unmasking of Shared peripheral interrupts(SPI). So the
	* interrupt enable/disable control should be in sync and consistent
	* at WakeupGen and GIC so that interrupts are not lost.
	*/
	static void irq_save_context(void)
	{
	u32 i, val;

	if (omap_rev() == OMAP4430_REV_ES1_0)
	return;

	if (!sar_base)
	sar_base = omap4_get_sar_ram_base();

	for (i = 0; i < NR_BANKS; i++) {
	/* Save the CPUx interrupt mask for IRQ 0 to 127 */
	val = wakeupgen_readl(i, 0);
	sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
	val = wakeupgen_readl(i, 1);
	sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);

	/*
	* Disable the secure interrupts for CPUx. The restore
	* code blindly restores secure and non-secure interrupt
	* masks from SAR RAM. Secure interrupts are not suppose
	* to be enabled from HLOS. So overwrite the SAR location
	* so that the secure interrupt remains disabled.
	*/
	sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
	sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
	}

	/* Save AuxBoot* registers */
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);

	/* Save SyncReq generation logic */
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);

	/* Save SyncReq generation logic */
	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
	__raw_writel(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
	__raw_writel(val, sar_base + PTMSYNCREQ_EN_OFFSET);

	/* Set the Backup Bit Mask status */
	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
	val \|= SAR_BACKUP_STATUS_WAKEUPGEN;
	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
	}

	/*
	* Clear WakeupGen SAR backup status.
	*/
	void irq_sar_clear(void)
	{
	u32 val;
	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
	}

	/*
	* Save GIC and Wakeupgen interrupt context using secure API
	* for HS/EMU devices.
	*/
	static void irq_save_secure_context(void)
	{
	u32 ret;
	ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
	FLAG_START_CRITICAL,
	0, 0, 0, 0, 0);
	if (ret != API_HAL_RET_VALUE_OK)
	pr_err("GIC and Wakeupgen context save failed\n");
	}

	#ifdef CONFIG_HOTPLUG_CPU
	static int __cpuinit irq_cpu_hotplug_notify(struct notifier_block *self,
	unsigned long action, void *hcpu)
	{
	unsigned int cpu = (unsigned int)hcpu;

	switch (action) {
	case CPU_ONLINE:
	wakeupgen_irqmask_all(cpu, 0);
	break;
	case CPU_DEAD:
	wakeupgen_irqmask_all(cpu, 1);
	break;
	}
	return NOTIFY_OK;
	}

	static struct notifier_block __refdata irq_hotplug_notifier = {
	.notifier_call = irq_cpu_hotplug_notify,
	};

	static void __init irq_hotplug_init(void)
	{
	register_hotcpu_notifier(&irq_hotplug_notifier);
	}
	#else
	static void __init irq_hotplug_init(void)
	{}
	#endif

	#ifdef CONFIG_CPU_PM
	static int irq_notifier(struct notifier_block self, unsigned long cmd, void v)
	{
	switch (cmd) {
	case CPU_CLUSTER_PM_ENTER:
	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
	irq_save_context();
	else
	irq_save_secure_context();
	break;
	case CPU_CLUSTER_PM_EXIT:
	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
	irq_sar_clear();
	break;
	}
	return NOTIFY_OK;
	}

	static struct notifier_block irq_notifier_block = {
	.notifier_call = irq_notifier,
	};

	static void __init irq_pm_init(void)
	{
	cpu_pm_register_notifier(&irq_notifier_block);
	}
	#else
	static void __init irq_pm_init(void)
	{}
	#endif

	/*
	* Initialise the wakeupgen module.
	*/
	int __init omap_wakeupgen_init(void)
	{
	int i;
	unsigned int boot_cpu = smp_processor_id();

	/* Not supported on OMAP4 ES1.0 silicon */
	if (omap_rev() == OMAP4430_REV_ES1_0) {
	WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
	return -EPERM;
	}

	/* Static mapping, never released */
	wakeupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
	if (WARN_ON(!wakeupgen_base))
	return -ENODEV;

	/* Clear all IRQ bitmasks at wakeupGen level */
	for (i = 0; i < NR_BANKS; i++) {
	wakeupgen_writel(0, i, CPU0_ID);
	wakeupgen_writel(0, i, CPU1_ID);
	}

	/*
	* Override GIC architecture specific functions to add
	* OMAP WakeupGen interrupt controller along with GIC
	*/
	gic_arch_extn.irq_mask = wakeupgen_mask;
	gic_arch_extn.irq_unmask = wakeupgen_unmask;
	gic_arch_extn.irq_set_wake = wakeupgen_set_wake;

	/*
	* FIXME: Add support to set_smp_affinity() once the core
	* GIC code has necessary hooks in place.
	*/

	/* Associate all the IRQs to boot CPU like GIC init does. */
	for (i = 0; i < NR_IRQS; i++)
	irq_target_cpu[i] = boot_cpu;

	irq_hotplug_init();
	irq_pm_init();

	return 0;
	}