[deliverable/linux.git] / arch / arm / mach-omap2 / omap-wakeupgen.c

/*
 * 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/cpu.h>
#include <linux/notifier.h>
#include <linux/cpu_pm.h>

#include <asm/hardware/gic.h>

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

#include "soc.h"
#include "omap4-sar-layout.h"
#include "common.h"

#define MAX_NR_REG_BANKS	5
#define MAX_IRQS		160
#define WKG_MASK_ALL		0x00000000
#define WKG_UNMASK_ALL		0xffffffff
#define CPU_ENA_OFFSET		0x400
#define CPU0_ID			0x0
#define CPU1_ID			0x1
#define OMAP4_NR_BANKS		4
#define OMAP4_NR_IRQS		128

static void __iomem *wakeupgen_base;
static void __iomem *sar_base;
static DEFINE_SPINLOCK(wakeupgen_lock);
static unsigned int irq_target_cpu[NR_IRQS];
static unsigned int irq_banks = MAX_NR_REG_BANKS;
static unsigned int max_irqs = MAX_IRQS;
static unsigned int omap_secure_apis;

/*
 * 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 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);
}

/*
 * 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_HOTPLUG_CPU
static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);

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

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

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

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

/*
 * 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.
 */
static 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);
}
#endif

#ifdef CONFIG_CPU_PM
static inline void omap4_irq_save_context(void)
{
	u32 i, val;

	if (omap_rev() == OMAP4430_REV_ES1_0)
		return;

	for (i = 0; i < irq_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);

}

static inline void omap5_irq_save_context(void)
{
	u32 i, val;

	for (i = 0; i < irq_banks; i++) {
		/* Save the CPUx interrupt mask for IRQ 0 to 159 */
		val = wakeupgen_readl(i, 0);
		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
		val = wakeupgen_readl(i, 1);
		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
	}

	/* Save AuxBoot* registers */
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);

	/* Set the Backup Bit Mask status */
	val = __raw_readl(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
	__raw_writel(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);

}

/*
 * 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)
{
	if (!sar_base)
		sar_base = omap4_get_sar_ram_base();

	if (soc_is_omap54xx())
		omap5_irq_save_context();
	else
		omap4_irq_save_context();
}

/*
 * Clear WakeupGen SAR backup status.
 */
static void irq_sar_clear(void)
{
	u32 val;
	u32 offset = SAR_BACKUP_STATUS_OFFSET;

	if (soc_is_omap54xx())
		offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;

	val = __raw_readl(sar_base + offset);
	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
	__raw_writel(val, sar_base + 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");
}
#endif

#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)
{
	/* FIXME: Remove this when MPU OSWR support is added */
	if (!soc_is_omap54xx())
		cpu_pm_register_notifier(&irq_notifier_block);
}
#else
static void __init irq_pm_init(void)
{}
#endif

void __iomem *omap_get_wakeupgen_base(void)
{
	return wakeupgen_base;
}

int omap_secure_apis_support(void)
{
	return omap_secure_apis;
}

/*
 * 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(OMAP_WKUPGEN_BASE, SZ_4K);
	if (WARN_ON(!wakeupgen_base))
		return -ENOMEM;

	if (cpu_is_omap44xx()) {
		irq_banks = OMAP4_NR_BANKS;
		max_irqs = OMAP4_NR_IRQS;
		omap_secure_apis = 1;
	}

	/* Clear all IRQ bitmasks at wakeupGen level */
	for (i = 0; i < irq_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.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_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 < max_irqs; i++)
		irq_target_cpu[i] = boot_cpu;

	irq_hotplug_init();
	irq_pm_init();

	return 0;
}
Commit	Line	Data
fcf6efa3 SS	1	/*
	2	* OMAP WakeupGen Source file
	3	*
	4	* OMAP WakeupGen is the interrupt controller extension used along
	5	* with ARM GIC to wake the CPU out from low power states on
	6	* external interrupts. It is responsible for generating wakeup
	7	* event from the incoming interrupts and enable bits. It is
	8	* implemented in MPU always ON power domain. During normal operation,
	9	* WakeupGen delivers external interrupts directly to the GIC.
	10	*
	11	* Copyright (C) 2011 Texas Instruments, Inc.
	12	* Santosh Shilimkar <santosh.shilimkar@ti.com>
	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License version 2 as
	16	* published by the Free Software Foundation.
	17	*/
	18
	19	#include <linux/kernel.h>
	20	#include <linux/init.h>
	21	#include <linux/io.h>
	22	#include <linux/irq.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/cpu.h>
0f3cf2ec SS	25	#include <linux/notifier.h>
0f3cf2ec SS	26	#include <linux/cpu_pm.h>
fcf6efa3 SS	27
	28	#include <asm/hardware/gic.h>
	29
	30	#include <mach/omap-wakeupgen.h>
0f3cf2ec SS	31	#include <mach/omap-secure.h>
0f3cf2ec SS	32
dbc04161	33	#include "soc.h"
0f3cf2ec SS	34	#include "omap4-sar-layout.h"
0f3cf2ec SS	35	#include "common.h"
fcf6efa3	36
247c445c SS	37	#define MAX_NR_REG_BANKS 5
247c445c SS	38	#define MAX_IRQS 160
fcf6efa3 SS	39	#define WKG_MASK_ALL 0x00000000
	40	#define WKG_UNMASK_ALL 0xffffffff
	41	#define CPU_ENA_OFFSET 0x400
	42	#define CPU0_ID 0x0
	43	#define CPU1_ID 0x1
247c445c SS	44	#define OMAP4_NR_BANKS 4
247c445c SS	45	#define OMAP4_NR_IRQS 128
fcf6efa3 SS	46
fcf6efa3 SS	47	static void __iomem *wakeupgen_base;
0f3cf2ec	48	static void __iomem *sar_base;
fcf6efa3 SS	49	static DEFINE_SPINLOCK(wakeupgen_lock);
fcf6efa3 SS	50	static unsigned int irq_target_cpu[NR_IRQS];
247c445c SS	51	static unsigned int irq_banks = MAX_NR_REG_BANKS;
	52	static unsigned int max_irqs = MAX_IRQS;
	53	static unsigned int omap_secure_apis;
fcf6efa3 SS	54
	55	/*
	56	* Static helper functions.
	57	*/
	58	static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
	59	{
	60	return __raw_readl(wakeupgen_base + OMAP_WKG_ENB_A_0 +
	61	(cpu * CPU_ENA_OFFSET) + (idx * 4));
	62	}
	63
	64	static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
	65	{
	66	__raw_writel(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
	67	(cpu * CPU_ENA_OFFSET) + (idx * 4));
	68	}
	69
0f3cf2ec SS	70	static inline void sar_writel(u32 val, u32 offset, u8 idx)
	71	{
	72	__raw_writel(val, sar_base + offset + (idx * 4));
	73	}
	74
fcf6efa3 SS	75	static inline int _wakeupgen_get_irq_info(u32 irq, u32 bit_posn, u8 reg_index)
	76	{
	77	unsigned int spi_irq;
	78
	79	/*
	80	* PPIs and SGIs are not supported.
	81	*/
	82	if (irq < OMAP44XX_IRQ_GIC_START)
	83	return -EINVAL;
	84
	85	/*
	86	* Subtract the GIC offset.
	87	*/
	88	spi_irq = irq - OMAP44XX_IRQ_GIC_START;
	89	if (spi_irq > MAX_IRQS) {
	90	pr_err("omap wakeupGen: Invalid IRQ%d\n", irq);
	91	return -EINVAL;
	92	}
	93
	94	/*
	95	* Each WakeupGen register controls 32 interrupt.
	96	* i.e. 1 bit per SPI IRQ
	97	*/
	98	*reg_index = spi_irq >> 5;
	99	*bit_posn = spi_irq %= 32;
	100
	101	return 0;
	102	}
	103
	104	static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
	105	{
	106	u32 val, bit_number;
	107	u8 i;
	108
	109	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
	110	return;
	111
	112	val = wakeupgen_readl(i, cpu);
	113	val &= ~BIT(bit_number);
	114	wakeupgen_writel(val, i, cpu);
	115	}
	116
	117	static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
	118	{
	119	u32 val, bit_number;
	120	u8 i;
	121
	122	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
	123	return;
	124
	125	val = wakeupgen_readl(i, cpu);
	126	val \|= BIT(bit_number);
	127	wakeupgen_writel(val, i, cpu);
	128	}
	129
fcf6efa3 SS	130	/*
	131	* Architecture specific Mask extension
	132	*/
	133	static void wakeupgen_mask(struct irq_data *d)
	134	{
	135	unsigned long flags;
	136
	137	spin_lock_irqsave(&wakeupgen_lock, flags);
	138	_wakeupgen_clear(d->irq, irq_target_cpu[d->irq]);
	139	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	140	}
	141
	142	/*
	143	* Architecture specific Unmask extension
	144	*/
	145	static void wakeupgen_unmask(struct irq_data *d)
	146	{
	147	unsigned long flags;
	148
	149	spin_lock_irqsave(&wakeupgen_lock, flags);
	150	_wakeupgen_set(d->irq, irq_target_cpu[d->irq]);
	151	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	152	}
	153
bb1dbe7c	154	#ifdef CONFIG_HOTPLUG_CPU
247c445c	155	static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);
bb1dbe7c KH	156
	157	static void _wakeupgen_save_masks(unsigned int cpu)
	158	{
	159	u8 i;
	160
247c445c	161	for (i = 0; i < irq_banks; i++)
bb1dbe7c KH	162	per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
	163	}
	164
	165	static void _wakeupgen_restore_masks(unsigned int cpu)
	166	{
	167	u8 i;
	168
247c445c	169	for (i = 0; i < irq_banks; i++)
bb1dbe7c KH	170	wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
	171	}
	172
	173	static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
	174	{
	175	u8 i;
	176
247c445c	177	for (i = 0; i < irq_banks; i++)
bb1dbe7c KH	178	wakeupgen_writel(reg, i, cpu);
	179	}
	180
fcf6efa3 SS	181	/*
	182	* Mask or unmask all interrupts on given CPU.
	183	* 0 = Mask all interrupts on the 'cpu'
	184	* 1 = Unmask all interrupts on the 'cpu'
	185	* Ensure that the initial mask is maintained. This is faster than
	186	* iterating through GIC registers to arrive at the correct masks.
	187	*/
	188	static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
	189	{
	190	unsigned long flags;
	191
	192	spin_lock_irqsave(&wakeupgen_lock, flags);
	193	if (set) {
	194	_wakeupgen_save_masks(cpu);
	195	_wakeupgen_set_all(cpu, WKG_MASK_ALL);
	196	} else {
	197	_wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
	198	_wakeupgen_restore_masks(cpu);
	199	}
	200	spin_unlock_irqrestore(&wakeupgen_lock, flags);
	201	}
bb1dbe7c	202	#endif
fcf6efa3	203
0f3cf2ec	204	#ifdef CONFIG_CPU_PM
247c445c	205	static inline void omap4_irq_save_context(void)
0f3cf2ec SS	206	{
	207	u32 i, val;
	208
	209	if (omap_rev() == OMAP4430_REV_ES1_0)
	210	return;
	211
247c445c	212	for (i = 0; i < irq_banks; i++) {
0f3cf2ec SS	213	/* Save the CPUx interrupt mask for IRQ 0 to 127 */
	214	val = wakeupgen_readl(i, 0);
	215	sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
	216	val = wakeupgen_readl(i, 1);
	217	sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
	218
	219	/*
	220	* Disable the secure interrupts for CPUx. The restore
	221	* code blindly restores secure and non-secure interrupt
	222	* masks from SAR RAM. Secure interrupts are not suppose
	223	* to be enabled from HLOS. So overwrite the SAR location
	224	* so that the secure interrupt remains disabled.
	225	*/
	226	sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
	227	sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
	228	}
	229
	230	/* Save AuxBoot* registers */
	231	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	232	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
	233	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	234	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
	235
	236	/* Save SyncReq generation logic */
	237	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	238	__raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
	239	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	240	__raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
	241
	242	/* Save SyncReq generation logic */
	243	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
	244	__raw_writel(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
	245	val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
	246	__raw_writel(val, sar_base + PTMSYNCREQ_EN_OFFSET);
	247
	248	/* Set the Backup Bit Mask status */
	249	val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
	250	val \|= SAR_BACKUP_STATUS_WAKEUPGEN;
	251	__raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
247c445c SS	252
	253	}
	254
	255	static inline void omap5_irq_save_context(void)
	256	{
	257	u32 i, val;
	258
	259	for (i = 0; i < irq_banks; i++) {
	260	/* Save the CPUx interrupt mask for IRQ 0 to 159 */
	261	val = wakeupgen_readl(i, 0);
	262	sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
	263	val = wakeupgen_readl(i, 1);
	264	sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
	265	sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
	266	sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
	267	}
	268
	269	/* Save AuxBoot* registers */
	270	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	271	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
	272	val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
	273	__raw_writel(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);
	274
	275	/* Set the Backup Bit Mask status */
	276	val = __raw_readl(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
	277	val \|= SAR_BACKUP_STATUS_WAKEUPGEN;
	278	__raw_writel(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
	279
	280	}
	281
	282	/*
	283	* Save WakeupGen interrupt context in SAR BANK3. Restore is done by
	284	* ROM code. WakeupGen IP is integrated along with GIC to manage the
	285	* interrupt wakeups from CPU low power states. It manages
	286	* masking/unmasking of Shared peripheral interrupts(SPI). So the
	287	* interrupt enable/disable control should be in sync and consistent
	288	* at WakeupGen and GIC so that interrupts are not lost.
	289	*/
	290	static void irq_save_context(void)
	291	{
	292	if (!sar_base)
	293	sar_base = omap4_get_sar_ram_base();
	294
	295	if (soc_is_omap54xx())
	296	omap5_irq_save_context();
	297	else
	298	omap4_irq_save_context();
0f3cf2ec SS	299	}
	300
	301	/*
	302	* Clear WakeupGen SAR backup status.
	303	*/
8c3d4534	304	static void irq_sar_clear(void)
0f3cf2ec SS	305	{
0f3cf2ec SS	306	u32 val;
247c445c SS	307	u32 offset = SAR_BACKUP_STATUS_OFFSET;
	308
	309	if (soc_is_omap54xx())
	310	offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;
	311
	312	val = __raw_readl(sar_base + offset);
0f3cf2ec	313	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
247c445c	314	__raw_writel(val, sar_base + offset);
0f3cf2ec SS	315	}
	316
	317	/*
	318	* Save GIC and Wakeupgen interrupt context using secure API
	319	* for HS/EMU devices.
	320	*/
	321	static void irq_save_secure_context(void)
	322	{
	323	u32 ret;
	324	ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
	325	FLAG_START_CRITICAL,
	326	0, 0, 0, 0, 0);
	327	if (ret != API_HAL_RET_VALUE_OK)
	328	pr_err("GIC and Wakeupgen context save failed\n");
	329	}
	330	#endif
	331
b5b4f288 SS	332	#ifdef CONFIG_HOTPLUG_CPU
	333	static int __cpuinit irq_cpu_hotplug_notify(struct notifier_block *self,
	334	unsigned long action, void *hcpu)
	335	{
	336	unsigned int cpu = (unsigned int)hcpu;
	337
	338	switch (action) {
	339	case CPU_ONLINE:
	340	wakeupgen_irqmask_all(cpu, 0);
	341	break;
	342	case CPU_DEAD:
	343	wakeupgen_irqmask_all(cpu, 1);
	344	break;
	345	}
	346	return NOTIFY_OK;
	347	}
	348
	349	static struct notifier_block __refdata irq_hotplug_notifier = {
	350	.notifier_call = irq_cpu_hotplug_notify,
	351	};
	352
	353	static void __init irq_hotplug_init(void)
	354	{
	355	register_hotcpu_notifier(&irq_hotplug_notifier);
	356	}
	357	#else
	358	static void __init irq_hotplug_init(void)
	359	{}
	360	#endif
	361
0f3cf2ec SS	362	#ifdef CONFIG_CPU_PM
	363	static int irq_notifier(struct notifier_block self, unsigned long cmd, void v)
	364	{
	365	switch (cmd) {
	366	case CPU_CLUSTER_PM_ENTER:
	367	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
	368	irq_save_context();
	369	else
	370	irq_save_secure_context();
	371	break;
	372	case CPU_CLUSTER_PM_EXIT:
	373	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
	374	irq_sar_clear();
	375	break;
	376	}
	377	return NOTIFY_OK;
	378	}
	379
	380	static struct notifier_block irq_notifier_block = {
	381	.notifier_call = irq_notifier,
	382	};
	383
	384	static void __init irq_pm_init(void)
	385	{
247c445c SS	386	/* FIXME: Remove this when MPU OSWR support is added */
	387	if (!soc_is_omap54xx())
	388	cpu_pm_register_notifier(&irq_notifier_block);
0f3cf2ec SS	389	}
	390	#else
	391	static void __init irq_pm_init(void)
	392	{}
	393	#endif
	394
247c445c SS	395	void __iomem *omap_get_wakeupgen_base(void)
	396	{
	397	return wakeupgen_base;
	398	}
	399
	400	int omap_secure_apis_support(void)
	401	{
	402	return omap_secure_apis;
	403	}
	404
fcf6efa3 SS	405	/*
	406	* Initialise the wakeupgen module.
	407	*/
	408	int __init omap_wakeupgen_init(void)
	409	{
	410	int i;
	411	unsigned int boot_cpu = smp_processor_id();
	412
	413	/* Not supported on OMAP4 ES1.0 silicon */
	414	if (omap_rev() == OMAP4430_REV_ES1_0) {
	415	WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
	416	return -EPERM;
	417	}
	418
	419	/* Static mapping, never released */
247c445c	420	wakeupgen_base = ioremap(OMAP_WKUPGEN_BASE, SZ_4K);
fcf6efa3 SS	421	if (WARN_ON(!wakeupgen_base))
	422	return -ENOMEM;
	423
247c445c SS	424	if (cpu_is_omap44xx()) {
	425	irq_banks = OMAP4_NR_BANKS;
	426	max_irqs = OMAP4_NR_IRQS;
	427	omap_secure_apis = 1;
	428	}
	429
fcf6efa3	430	/* Clear all IRQ bitmasks at wakeupGen level */
247c445c	431	for (i = 0; i < irq_banks; i++) {
fcf6efa3 SS	432	wakeupgen_writel(0, i, CPU0_ID);
	433	wakeupgen_writel(0, i, CPU1_ID);
	434	}
	435
	436	/*
	437	* Override GIC architecture specific functions to add
	438	* OMAP WakeupGen interrupt controller along with GIC
	439	*/
	440	gic_arch_extn.irq_mask = wakeupgen_mask;
	441	gic_arch_extn.irq_unmask = wakeupgen_unmask;
	442	gic_arch_extn.flags = IRQCHIP_MASK_ON_SUSPEND \| IRQCHIP_SKIP_SET_WAKE;
	443
	444	/*
	445	* FIXME: Add support to set_smp_affinity() once the core
	446	* GIC code has necessary hooks in place.
	447	*/
	448
	449	/* Associate all the IRQs to boot CPU like GIC init does. */
247c445c	450	for (i = 0; i < max_irqs; i++)
fcf6efa3 SS	451	irq_target_cpu[i] = boot_cpu;
fcf6efa3 SS	452
b5b4f288	453	irq_hotplug_init();
0f3cf2ec	454	irq_pm_init();
b5b4f288	455
fcf6efa3 SS	456	return 0;
fcf6efa3 SS	457	}