path: root/drivers/soc/qcom/mpm-of.c

/* Copyright (c) 2010-2017, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/rpm-smd-regulator.h>
#include <linux/workqueue.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/clk/msm-clk.h>
#include <linux/irqchip/msm-gpio-irq.h>
#include <linux/irqchip/msm-mpm-irq.h>
#include <linux/mutex.h>
#include <asm/arch_timer.h>

enum {
	MSM_MPM_GIC_IRQ_DOMAIN,
	MSM_MPM_GPIO_IRQ_DOMAIN,
	MSM_MPM_NR_IRQ_DOMAINS,
};

enum {
	MSM_MPM_SET_ENABLED,
	MSM_MPM_SET_WAKEUP,
	MSM_NR_IRQS_SET,
};

struct mpm_irqs_a2m {
	struct irq_domain *domain;
	struct device_node *parent;
	irq_hw_number_t hwirq;
	unsigned long pin;
	struct hlist_node node;
};
#define MAX_DOMAIN_NAME 5

struct mpm_irqs {
	struct irq_domain *domain;
	unsigned long *enabled_irqs;
	unsigned long *wakeup_irqs;
	unsigned long size;
	char domain_name[MAX_DOMAIN_NAME];
};

#define MAX_MPM_PIN_PER_IRQ 2
static struct mpm_irqs unlisted_irqs[MSM_MPM_NR_IRQ_DOMAINS];
static int num_mpm_irqs = MSM_MPM_NR_MPM_IRQS;
static struct hlist_head *irq_hash;
static unsigned int *msm_mpm_irqs_m2a;
#define MSM_MPM_REG_WIDTH  DIV_ROUND_UP(num_mpm_irqs, 32)

#define MSM_MPM_IRQ_INDEX(irq)  (irq / 32)
#define MSM_MPM_IRQ_MASK(irq)  BIT(irq % 32)
#define MSM_MPM_IRQ_DOMAIN_MASK(domain) BIT(domain)

#define hashfn(val) (val % num_mpm_irqs)
#define SCLK_HZ (32768)
#define ARCH_TIMER_HZ (19200000)
#define MAX_IRQ 1024

struct msm_mpm_device_data {
	uint16_t *irqs_m2a;
	unsigned int irqs_m2a_size;
	uint16_t *bypassed_apps_irqs;
	unsigned int bypassed_apps_irqs_size;
	void __iomem *mpm_request_reg_base;
	void __iomem *mpm_status_reg_base;
	void __iomem *mpm_apps_ipc_reg;
	unsigned int mpm_apps_ipc_val;
	unsigned int mpm_ipc_irq;
};
static struct msm_mpm_device_data msm_mpm_dev_data;

struct mpm_of {
	char *pkey;
	char *map;
	char name[MAX_DOMAIN_NAME];
	struct irq_chip *chip;
	int (*get_max_irqs)(struct irq_domain *d);
};

static struct clk *xo_clk;
static bool xo_enabled;
static bool msm_mpm_in_suspend;
static struct workqueue_struct *msm_mpm_wq;
static struct work_struct msm_mpm_work;
static struct completion wake_wq;

enum mpm_reg_offsets {
	MSM_MPM_REG_ENABLE,
	MSM_MPM_REG_FALLING_EDGE,
	MSM_MPM_REG_RISING_EDGE,
	MSM_MPM_REG_POLARITY,
	MSM_MPM_REG_STATUS,
};

static DEFINE_SPINLOCK(msm_mpm_lock);

static uint32_t *msm_mpm_enabled_irq;
static uint32_t *msm_mpm_wake_irq;
static uint32_t *msm_mpm_falling_edge;
static uint32_t *msm_mpm_rising_edge;
static uint32_t *msm_mpm_polarity;

enum mpm_state {
	MSM_MPM_GIC_IRQ_MAPPING_DONE = BIT(0),
	MSM_MPM_GPIO_IRQ_MAPPING_DONE = BIT(1),
	MSM_MPM_DEVICE_PROBED = BIT(2),
};

static enum mpm_state msm_mpm_initialized;
static int mpm_init_irq_domain(struct device_node *node, int irq_domain);

static inline bool msm_mpm_is_initialized(void)
{
	return msm_mpm_initialized &
		(MSM_MPM_GIC_IRQ_MAPPING_DONE | MSM_MPM_DEVICE_PROBED);

}

static inline uint32_t msm_mpm_read(
	unsigned int reg, unsigned int subreg_index)
{
	unsigned int offset = reg * MSM_MPM_REG_WIDTH + subreg_index + 2;
	return __raw_readl(msm_mpm_dev_data.mpm_request_reg_base + offset * 4);
}

static inline void msm_mpm_write(
	unsigned int reg, unsigned int subreg_index, uint32_t value)
{
	/*
	 * Add 2 to offset to account for the 64 bit timer in the vMPM
	 * mapping
	 */
	unsigned int offset = reg * MSM_MPM_REG_WIDTH + subreg_index + 2;

	__raw_writel(value, msm_mpm_dev_data.mpm_request_reg_base + offset * 4);
}

static inline void msm_mpm_send_interrupt(void)
{
	__raw_writel(msm_mpm_dev_data.mpm_apps_ipc_val,
			msm_mpm_dev_data.mpm_apps_ipc_reg);
	/* Ensure the write is complete before returning. */
	wmb();
}

static irqreturn_t msm_mpm_irq(int irq, void *dev_id)
{
	/*
	 * When the system resumes from deep sleep mode, the RPM hardware wakes
	 * up the Apps processor by triggering this interrupt. This interrupt
	 * has to be enabled and set as wake for the irq to get SPM out of
	 * sleep. Handle the interrupt here to make sure that it gets cleared.
	 */
	return IRQ_HANDLED;
}

static void msm_mpm_timer_write(uint32_t *expiry)
{
	__raw_writel(expiry[0], msm_mpm_dev_data.mpm_request_reg_base);
	__raw_writel(expiry[1], msm_mpm_dev_data.mpm_request_reg_base + 0x4);
}

static void msm_mpm_set(cycle_t wakeup, bool wakeset)
{
	uint32_t *irqs;
	unsigned int reg;
	int i;

	msm_mpm_timer_write((uint32_t *)&wakeup);

	irqs = wakeset ? msm_mpm_wake_irq : msm_mpm_enabled_irq;
	for (i = 0; i < MSM_MPM_REG_WIDTH; i++) {
		reg = MSM_MPM_REG_ENABLE;
		msm_mpm_write(reg, i, irqs[i]);

		reg = MSM_MPM_REG_FALLING_EDGE;
		msm_mpm_write(reg, i, msm_mpm_falling_edge[i]);

		reg = MSM_MPM_REG_RISING_EDGE;
		msm_mpm_write(reg, i, msm_mpm_rising_edge[i]);

		reg = MSM_MPM_REG_POLARITY;
		msm_mpm_write(reg, i, msm_mpm_polarity[i]);

		reg = MSM_MPM_REG_STATUS;
		msm_mpm_write(reg, i, 0);
	}

	/*
	 * Ensure that the set operation is complete before sending the
	 * interrupt
	 */
	wmb();
	msm_mpm_send_interrupt();
}

static inline unsigned int msm_mpm_get_irq_m2a(unsigned int pin)
{
	BUG_ON(!msm_mpm_irqs_m2a);
	return msm_mpm_irqs_m2a[pin];
}

static inline void msm_mpm_get_irq_a2m(struct irq_data *d, uint16_t *mpm_pins)
{
	struct mpm_irqs_a2m *node = NULL;
	int count = 0;

	hlist_for_each_entry(node, &irq_hash[hashfn(d->hwirq)], node) {
		if ((node->hwirq == d->hwirq)
				&& (d->domain == node->domain)) {
			/*
			 * Update the linux irq mapping. No update required for
			 * bypass interrupts
			 */
			if (node->pin != 0xff)
				msm_mpm_irqs_m2a[node->pin] = d->irq;
			if (count >= MAX_MPM_PIN_PER_IRQ) {
				count--;
				__WARN();
			}
			mpm_pins[count] = node->pin;
			count++;
		}
	}
}

static int msm_mpm_enable_irq_exclusive(
	struct irq_data *d, bool enable, bool wakeset)
{
	uint16_t num = 0;
	uint16_t mpm_pins[MAX_MPM_PIN_PER_IRQ] = {0};

	WARN_ON(!d);

	if (!d)
		return 0;

	msm_mpm_get_irq_a2m(d, mpm_pins);

	for (num = 0; num < MAX_MPM_PIN_PER_IRQ; num++) {

		if (mpm_pins[num] == 0xff)
			break;

		if (num && mpm_pins[num] == 0)
			break;

		if (mpm_pins[num]) {
			uint32_t *mpm_irq_masks = wakeset ?
				msm_mpm_wake_irq : msm_mpm_enabled_irq;
			uint32_t index = MSM_MPM_IRQ_INDEX(mpm_pins[num]);
			uint32_t mask = MSM_MPM_IRQ_MASK(mpm_pins[num]);

			if (enable)
				mpm_irq_masks[index] |= mask;
			else
				mpm_irq_masks[index] &= ~mask;
		} else {
			int i;
			unsigned long *irq_apps;

			for (i = 0; i < MSM_MPM_NR_IRQ_DOMAINS; i++) {
				if (d->domain == unlisted_irqs[i].domain)
					break;
			}

			if (i == MSM_MPM_NR_IRQ_DOMAINS)
				return 0;

			irq_apps = wakeset ? unlisted_irqs[i].wakeup_irqs :
					unlisted_irqs[i].enabled_irqs;

			if (enable)
				__set_bit(d->hwirq, irq_apps);
			else
				__clear_bit(d->hwirq, irq_apps);

			if ((msm_mpm_initialized & MSM_MPM_DEVICE_PROBED)
				&& !wakeset && !msm_mpm_in_suspend)
				complete(&wake_wq);
		}
	}

	return 0;
}

static void msm_mpm_set_edge_ctl(int pin, unsigned int flow_type)
{
	uint32_t index;
	uint32_t mask;

	index = MSM_MPM_IRQ_INDEX(pin);
	mask = MSM_MPM_IRQ_MASK(pin);

	if (flow_type & IRQ_TYPE_EDGE_FALLING)
		msm_mpm_falling_edge[index] |= mask;
	else
		msm_mpm_falling_edge[index] &= ~mask;

	if (flow_type & IRQ_TYPE_EDGE_RISING)
		msm_mpm_rising_edge[index] |= mask;
	else
		msm_mpm_rising_edge[index] &= ~mask;

}

static int msm_mpm_set_irq_type_exclusive(
	struct irq_data *d, unsigned int flow_type)
{
	uint16_t num = 0;
	uint16_t mpm_pins[MAX_MPM_PIN_PER_IRQ] = {0};

	msm_mpm_get_irq_a2m(d, mpm_pins);

	for (num = 0; num < MAX_MPM_PIN_PER_IRQ; num++) {

		if (mpm_pins[num] == 0xff)
			break;

		if (mpm_pins[num]) {
			uint32_t index = MSM_MPM_IRQ_INDEX(mpm_pins[num]);
			uint32_t mask = MSM_MPM_IRQ_MASK(mpm_pins[num]);

			if (index >= MSM_MPM_REG_WIDTH)
				return -EFAULT;

			msm_mpm_set_edge_ctl(mpm_pins[num], flow_type);

			if (flow_type &  IRQ_TYPE_LEVEL_HIGH)
				msm_mpm_polarity[index] |= mask;
			else
				msm_mpm_polarity[index] &= ~mask;
		}
	}

	return 0;
}

static int __msm_mpm_enable_irq(struct irq_data *d, bool enable)
{
	unsigned long flags;
	int rc;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	rc = msm_mpm_enable_irq_exclusive(d, enable, false);
	spin_unlock_irqrestore(&msm_mpm_lock, flags);

	return rc;
}

static void msm_mpm_enable_irq(struct irq_data *d)
{
	__msm_mpm_enable_irq(d, true);
}

static void msm_mpm_disable_irq(struct irq_data *d)
{
	__msm_mpm_enable_irq(d, false);
}

static int msm_mpm_set_irq_wake(struct irq_data *d, unsigned int on)
{
	unsigned long flags;
	int rc;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);
	rc = msm_mpm_enable_irq_exclusive(d, (bool)on, true);
	spin_unlock_irqrestore(&msm_mpm_lock, flags);

	return rc;
}

static int msm_mpm_set_irq_type(struct irq_data *d, unsigned int flow_type)
{
	unsigned long flags;
	int rc;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);
	rc = msm_mpm_set_irq_type_exclusive(d, flow_type);
	spin_unlock_irqrestore(&msm_mpm_lock, flags);

	return rc;
}

/******************************************************************************
 * Public functions
 *****************************************************************************/
int msm_mpm_enable_pin(unsigned int pin, unsigned int enable)
{
	uint32_t index = MSM_MPM_IRQ_INDEX(pin);
	uint32_t mask = MSM_MPM_IRQ_MASK(pin);
	unsigned long flags;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	if (pin >= MSM_MPM_NR_MPM_IRQS)
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	if (enable)
		msm_mpm_enabled_irq[index] |= mask;
	else
		msm_mpm_enabled_irq[index] &= ~mask;

	spin_unlock_irqrestore(&msm_mpm_lock, flags);
	return 0;
}

int msm_mpm_set_pin_wake(unsigned int pin, unsigned int on)
{
	uint32_t index = MSM_MPM_IRQ_INDEX(pin);
	uint32_t mask = MSM_MPM_IRQ_MASK(pin);
	unsigned long flags;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	if (pin >= MSM_MPM_NR_MPM_IRQS)
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	if (on)
		msm_mpm_wake_irq[index] |= mask;
	else
		msm_mpm_wake_irq[index] &= ~mask;

	spin_unlock_irqrestore(&msm_mpm_lock, flags);
	return 0;
}

int msm_mpm_set_pin_type(unsigned int pin, unsigned int flow_type)
{
	uint32_t index = MSM_MPM_IRQ_INDEX(pin);
	uint32_t mask = MSM_MPM_IRQ_MASK(pin);
	unsigned long flags;

	if (!msm_mpm_is_initialized())
		return -EINVAL;

	if (pin >= MSM_MPM_NR_MPM_IRQS)
		return -EINVAL;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	msm_mpm_set_edge_ctl(pin, flow_type);

	if (flow_type & IRQ_TYPE_LEVEL_HIGH)
		msm_mpm_polarity[index] |= mask;
	else
		msm_mpm_polarity[index] &= ~mask;

	spin_unlock_irqrestore(&msm_mpm_lock, flags);
	return 0;
}

static bool msm_mpm_interrupts_detectable(int d, bool from_idle)
{
	unsigned long *irq_bitmap;
	bool ret = false;
	struct mpm_irqs *unlisted = &unlisted_irqs[d];

	if (!msm_mpm_is_initialized())
		return false;

	if (from_idle)
		irq_bitmap = unlisted->enabled_irqs;
	else
		irq_bitmap = unlisted->wakeup_irqs;

	ret = (bool) bitmap_empty(irq_bitmap, unlisted->size);

	return ret;
}

bool msm_mpm_gpio_irqs_detectable(bool from_idle)
{
	return msm_mpm_interrupts_detectable(MSM_MPM_GPIO_IRQ_DOMAIN,
			from_idle);
}
bool msm_mpm_irqs_detectable(bool from_idle)
{
	return msm_mpm_interrupts_detectable(MSM_MPM_GIC_IRQ_DOMAIN,
			from_idle);
}

void msm_mpm_enter_sleep(uint64_t sclk_count, bool from_idle,
		const struct cpumask *cpumask)
{
	cycle_t wakeup = (u64)sclk_count * ARCH_TIMER_HZ;

	if (!msm_mpm_is_initialized()) {
		pr_err("%s(): MPM not initialized\n", __func__);
		return;
	}

	if (sclk_count) {
		do_div(wakeup, SCLK_HZ);
		wakeup += arch_counter_get_cntvct();
	} else {
		wakeup = (~0ULL);
	}

	msm_mpm_gpio_irqs_detectable(from_idle);
	msm_mpm_irqs_detectable(from_idle);
	msm_mpm_set(wakeup, !from_idle);
	if (cpumask)
		irq_set_affinity(msm_mpm_dev_data.mpm_ipc_irq, cpumask);
}

void msm_mpm_exit_sleep(bool from_idle)
{
	unsigned long pending;
	uint32_t *enabled_intr;
	int i;
	int k;

	if (!msm_mpm_is_initialized()) {
		pr_err("%s(): MPM not initialized\n", __func__);
		return;
	}

	enabled_intr = from_idle ? msm_mpm_enabled_irq :
						msm_mpm_wake_irq;

	for (i = 0; i < MSM_MPM_REG_WIDTH; i++) {
		pending = msm_mpm_read(MSM_MPM_REG_STATUS, i);
		pending &= enabled_intr[i];

		k = find_first_bit(&pending, 32);
		while (k < 32) {
			unsigned int mpm_irq = 32 * i + k;
			unsigned int apps_irq = msm_mpm_get_irq_m2a(mpm_irq);
			struct irq_desc *desc = apps_irq ?
				irq_to_desc(apps_irq) : NULL;

			if (desc && !irqd_is_level_type(&desc->irq_data))
				irq_set_irqchip_state(apps_irq,
						IRQCHIP_STATE_PENDING, true);

			k = find_next_bit(&pending, 32, k + 1);
		}
	}
}
static void msm_mpm_sys_low_power_modes(bool allow)
{
	static DEFINE_MUTEX(enable_xo_mutex);

	mutex_lock(&enable_xo_mutex);
	if (allow) {
		if (xo_enabled) {
			clk_disable_unprepare(xo_clk);
			xo_enabled = false;
		}
	} else {
		if (!xo_enabled) {
			/* If we cannot enable XO clock then we want to flag it,
			 * than having to deal with not being able to wakeup
			 * from a non-monitorable interrupt
			 */
			BUG_ON(clk_prepare_enable(xo_clk));
			xo_enabled = true;
		}
	}
	mutex_unlock(&enable_xo_mutex);
}

void msm_mpm_suspend_prepare(void)
{
	bool allow;
	unsigned long flags;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	allow = msm_mpm_irqs_detectable(false) &&
		msm_mpm_gpio_irqs_detectable(false);
	msm_mpm_in_suspend = true;

	spin_unlock_irqrestore(&msm_mpm_lock, flags);
	msm_mpm_sys_low_power_modes(allow);
}
EXPORT_SYMBOL(msm_mpm_suspend_prepare);

void msm_mpm_suspend_wake(void)
{
	bool allow;
	unsigned long flags;

	spin_lock_irqsave(&msm_mpm_lock, flags);

	allow = msm_mpm_irqs_detectable(true) &&
		msm_mpm_gpio_irqs_detectable(true);

	spin_unlock_irqrestore(&msm_mpm_lock, flags);
	msm_mpm_sys_low_power_modes(allow);
	msm_mpm_in_suspend = false;
}
EXPORT_SYMBOL(msm_mpm_suspend_wake);

static void msm_mpm_work_fn(struct work_struct *work)
{
	unsigned long flags;
	while (1) {
		bool allow;
		wait_for_completion(&wake_wq);
		spin_lock_irqsave(&msm_mpm_lock, flags);
		allow = msm_mpm_irqs_detectable(true) &&
				msm_mpm_gpio_irqs_detectable(true);
		if (msm_mpm_in_suspend) {
			spin_unlock_irqrestore(&msm_mpm_lock, flags);
			continue;
		}

		spin_unlock_irqrestore(&msm_mpm_lock, flags);
		msm_mpm_sys_low_power_modes(allow);
	}
}

static int msm_mpm_dev_probe(struct platform_device *pdev)
{
	struct resource *res = NULL;
	int offset, ret;
	struct msm_mpm_device_data *dev = &msm_mpm_dev_data;
	const char *clk_name;
	char *key;

	if (msm_mpm_initialized & MSM_MPM_DEVICE_PROBED) {
		pr_warn("MPM device probed multiple times\n");
		return 0;
	}

	key = "clock-names";
	ret = of_property_read_string(pdev->dev.of_node, key, &clk_name);
	if (ret) {
		pr_err("%s(): Cannot read clock name%s\n", __func__, key);
		return -EINVAL;
	}

	xo_clk = clk_get(&pdev->dev, clk_name);

	if (IS_ERR(xo_clk)) {
		pr_err("%s(): Cannot get clk resource for XO: %ld\n", __func__,
				PTR_ERR(xo_clk));
		return PTR_ERR(xo_clk);
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vmpm");
	if (!res) {
		pr_err("%s(): Missing RPM memory resource\n", __func__);
		return -EINVAL;
	}

	dev->mpm_request_reg_base = devm_ioremap_resource(&pdev->dev, res);

	if (!dev->mpm_request_reg_base) {
		pr_err("%s(): Unable to iomap\n", __func__);
		return -EADDRNOTAVAIL;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ipc");
	if (!res) {
		pr_err("%s(): Missing GCC memory resource\n", __func__);
		return -EINVAL;
	}

	dev->mpm_apps_ipc_reg = devm_ioremap(&pdev->dev, res->start,
					resource_size(res));
	if (!dev->mpm_apps_ipc_reg) {
		pr_err("%s(): Unable to iomap IPC register\n", __func__);
		return -EADDRNOTAVAIL;
	}

	if (of_property_read_u32(pdev->dev.of_node,
				"qcom,ipc-bit-offset", &offset)) {
		pr_info("%s(): Cannot read ipc bit offset\n", __func__);
		return -EINVAL;
	}

	dev->mpm_apps_ipc_val = (1 << offset);

	dev->mpm_ipc_irq = platform_get_irq(pdev, 0);

	if (dev->mpm_ipc_irq == -ENXIO) {
		pr_info("%s(): Cannot find IRQ resource\n", __func__);
		return -ENXIO;
	}
	ret = devm_request_irq(&pdev->dev, dev->mpm_ipc_irq, msm_mpm_irq,
			IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND, pdev->name,
			msm_mpm_irq);

	if (ret) {
		pr_info("%s(): request_irq failed errno: %d\n", __func__, ret);
		return ret;
	}
	ret = irq_set_irq_wake(dev->mpm_ipc_irq, 1);

	if (ret) {
		pr_err("%s: failed to set wakeup irq %u: %d\n",
			__func__, dev->mpm_ipc_irq, ret);
		return ret;

	}

	init_completion(&wake_wq);

	INIT_WORK(&msm_mpm_work, msm_mpm_work_fn);
	msm_mpm_wq = create_singlethread_workqueue("mpm");

	if (msm_mpm_wq)
		queue_work(msm_mpm_wq, &msm_mpm_work);
	else  {
		pr_warn("%s(): Failed to create wq. So voting against XO off",
				__func__);
		/* Throw a BUG. Otherwise, its possible that system allows
		 * XO shutdown when there are non-monitored interrupts are
		 * pending and cause errors at a later point in time.
		 */
		BUG_ON(clk_prepare_enable(xo_clk));
		xo_enabled = true;
	}

	msm_mpm_initialized |= MSM_MPM_DEVICE_PROBED;
	return 0;
}

static inline int __init mpm_irq_domain_size(struct irq_domain *d)
{
	return d->revmap_size ?: MAX_IRQ;
}

static const struct mpm_of mpm_of_map[MSM_MPM_NR_IRQ_DOMAINS] = {
	{
		"qcom,gic-parent",
		"qcom,gic-map",
		"gic",
		&gic_arch_extn,
		mpm_irq_domain_size,
	},
	{
		"qcom,gpio-parent",
		"qcom,gpio-map",
		"gpio",
#if (defined(CONFIG_USE_PINCTRL_IRQ) && defined(CONFIG_PINCTRL_MSM_TLMM))
		&mpm_tlmm_irq_extn,
#elif defined(CONFIG_GPIO_MSM_V3)
		&msm_gpio_irq_extn,
#else
		&mpm_pinctrl_extn,
#endif
		mpm_irq_domain_size,
	},
};

static void freeup_memory(void)
{
	int i;

	for (i = 0; i < MSM_MPM_NR_IRQ_DOMAINS; i++) {
		if (mpm_of_map[i].chip) {
			mpm_of_map[i].chip->irq_mask = NULL;
			mpm_of_map[i].chip->irq_unmask = NULL;
			mpm_of_map[i].chip->irq_disable = NULL;
			mpm_of_map[i].chip->irq_set_type = NULL;
			mpm_of_map[i].chip->irq_set_wake = NULL;
		}
		kfree(unlisted_irqs[i].enabled_irqs);
		kfree(unlisted_irqs[i].wakeup_irqs);
	}

	kfree(irq_hash);
	kfree(msm_mpm_irqs_m2a);
	kfree(msm_mpm_enabled_irq);
	kfree(msm_mpm_wake_irq);
	kfree(msm_mpm_falling_edge);
	kfree(msm_mpm_rising_edge);
	kfree(msm_mpm_polarity);
}

static int mpm_init_irq_domain(struct device_node *node, int irq_domain)
{
	int i = irq_domain;
	struct device_node *parent = NULL;
	struct mpm_irqs_a2m *mpm_node = NULL;
	struct irq_domain *domain = NULL;
	int size;
	const __be32 *list;

	/* Check if mapping is already done for this irq domain */
	if (msm_mpm_initialized & MSM_MPM_IRQ_DOMAIN_MASK(irq_domain))
		return 0;

	parent = of_parse_phandle(node, mpm_of_map[i].pkey, 0);

	if (!parent) {
		pr_warn("%s(): %s Not found\n", __func__,
				mpm_of_map[i].pkey);
		return -ENODEV;
	}

	domain = irq_find_host(parent);

	if (!domain) {
		pr_warn("%s(): Cannot find irq controller for %s\n",
				__func__, mpm_of_map[i].pkey);
		return -EPROBE_DEFER;
	}

	size = mpm_of_map[i].get_max_irqs(domain);
	unlisted_irqs[i].size = size;
	memcpy(unlisted_irqs[i].domain_name, mpm_of_map[i].name,
			MAX_DOMAIN_NAME);

	unlisted_irqs[i].enabled_irqs =
		kzalloc(BITS_TO_LONGS(size) * sizeof(unsigned long),
				GFP_KERNEL);

	if (!unlisted_irqs[i].enabled_irqs)
		goto failed_malloc;

	unlisted_irqs[i].wakeup_irqs =
		kzalloc(BITS_TO_LONGS(size) * sizeof(unsigned long),
				GFP_KERNEL);

	if (!unlisted_irqs[i].wakeup_irqs)
		goto failed_malloc;

	unlisted_irqs[i].domain = domain;

	list = of_get_property(node, mpm_of_map[i].map, &size);

	if (!list || !size) {
		__WARN();
		return -ENODEV;
	}

	/*
	 * Size is in bytes. Convert to size of uint32_t
	 */
	size /= sizeof(*list);

	/*
	 * The data is represented by a tuple mapping hwirq to a MPM
	 * pin. The number of mappings in the device tree would be
	 * size/2
	 */
	mpm_node = kzalloc(sizeof(struct mpm_irqs_a2m) * size / 2,
			GFP_KERNEL);
	if (!mpm_node)
		goto failed_malloc;

	while (size) {
		unsigned long pin = be32_to_cpup(list++);
		irq_hw_number_t hwirq = be32_to_cpup(list++);

		mpm_node->pin = pin;
		mpm_node->hwirq = hwirq;
		mpm_node->parent = parent;
		mpm_node->domain = domain;
		INIT_HLIST_NODE(&mpm_node->node);

		hlist_add_head(&mpm_node->node,
				&irq_hash[hashfn(mpm_node->hwirq)]);
		size -= 2;
		mpm_node++;
	}

	if (mpm_of_map[i].chip) {
		mpm_of_map[i].chip->irq_mask = msm_mpm_disable_irq;
		mpm_of_map[i].chip->irq_unmask = msm_mpm_enable_irq;
		mpm_of_map[i].chip->irq_disable = msm_mpm_disable_irq;
		mpm_of_map[i].chip->irq_set_type = msm_mpm_set_irq_type;
		mpm_of_map[i].chip->irq_set_wake = msm_mpm_set_irq_wake;
	}

	msm_mpm_initialized |= MSM_MPM_IRQ_DOMAIN_MASK(irq_domain);

	return 0;
failed_malloc:

	freeup_memory();
	return -ENODEV;
}

static void __of_mpm_init(struct device_node *node)
{
	int i;

	if (msm_mpm_initialized & (MSM_MPM_GIC_IRQ_MAPPING_DONE |
				MSM_MPM_GPIO_IRQ_MAPPING_DONE)) {
		pr_warn("%s(): MPM driver mapping exists\n", __func__);
		return;
	}

	/*
	 * Assumes a default value of 64 MPM interrupts if the DT property
	 * num_mpm_irqs is not defined. The MPM driver assumes writing to 32
	 * bit words for configuring MPM registers. Ensure the num_mpm_irqs is
	 * a multiple of 32
	 */
	of_property_read_u32(node, "qcom,num-mpm-irqs", &num_mpm_irqs);

	irq_hash = kzalloc(num_mpm_irqs * sizeof(*irq_hash), GFP_KERNEL);
	if (!irq_hash)
		goto failed_malloc;

	msm_mpm_irqs_m2a = kzalloc(num_mpm_irqs * sizeof(*msm_mpm_irqs_m2a),
				GFP_KERNEL);
	if (!msm_mpm_irqs_m2a)
		goto failed_malloc;

	msm_mpm_enabled_irq = kzalloc(MSM_MPM_REG_WIDTH * sizeof(uint32_t),
				GFP_KERNEL);
	if (!msm_mpm_enabled_irq)
		goto failed_malloc;
	msm_mpm_wake_irq = kzalloc(MSM_MPM_REG_WIDTH * sizeof(uint32_t),
				GFP_KERNEL);
	if (!msm_mpm_wake_irq)
		goto failed_malloc;

	msm_mpm_falling_edge = kzalloc(MSM_MPM_REG_WIDTH * sizeof(uint32_t),
				GFP_KERNEL);
	if (!msm_mpm_falling_edge)
		goto failed_malloc;

	msm_mpm_rising_edge = kzalloc(MSM_MPM_REG_WIDTH * sizeof(uint32_t),
				GFP_KERNEL);
	if (!msm_mpm_rising_edge)
		goto failed_malloc;

	msm_mpm_polarity = kzalloc(MSM_MPM_REG_WIDTH * sizeof(uint32_t),
				GFP_KERNEL);
	if (!msm_mpm_polarity)
		goto failed_malloc;

	for (i = 0; i < num_mpm_irqs; i++)
		INIT_HLIST_HEAD(&irq_hash[i]);

	return;
failed_malloc:
	freeup_memory();
}



static struct of_device_id msm_mpm_match_table[] = {
	{.compatible = "qcom,mpm-v2"},
	{},
};

static struct platform_driver msm_mpm_dev_driver = {
	.probe = msm_mpm_dev_probe,
	.driver = {
		.name = "mpm-v2",
		.owner = THIS_MODULE,
		.of_match_table = msm_mpm_match_table,
	},
};

int __init msm_mpm_device_init(void)
{
	return platform_driver_register(&msm_mpm_dev_driver);
}
arch_initcall(msm_mpm_device_init);

void of_mpm_init(void)
{
	struct device_node *node;
	int i;
	int ret;

	node = of_find_matching_node(NULL, msm_mpm_match_table);
	WARN_ON(!node);
	if (node) {
		__of_mpm_init(node);
		for (i = 0; i < MSM_MPM_NR_IRQ_DOMAINS; i++) {
			ret = mpm_init_irq_domain(node, i);
			if (ret)
				pr_err("MPM %d irq mapping errored %d\n", i,
						ret);
		}
	}
}