drivers/irqchip/qcom-pdc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
  */

 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/soc/qcom/irq.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/types.h>

 #include <linux/qcom_scm.h>

 #define PDC_MAX_IRQS		168
 #define PDC_MAX_GPIO_IRQS	256

 #define CLEAR_INTR(reg, intr)	(reg & ~(1 << intr))
 #define ENABLE_INTR(reg, intr)	(reg | (1 << intr))

 #define IRQ_ENABLE_BANK		0x10
 #define IRQ_i_CFG		0x110

 #define PDC_NO_PARENT_IRQ	~0UL

 struct pdc_pin_region {
 	u32 pin_base;
 	u32 parent_base;
 	u32 cnt;
 };

 struct spi_cfg_regs {
 	union {
 		u64 start;
 		void __iomem *base;
 	};
 	resource_size_t size;
 	bool scm_io;
 };

 static DEFINE_RAW_SPINLOCK(pdc_lock);
 static void __iomem *pdc_base;
 static struct pdc_pin_region *pdc_region;
 static int pdc_region_cnt;
 static struct spi_cfg_regs *spi_cfg;

 static void pdc_reg_write(int reg, u32 i, u32 val)
 {
 	writel_relaxed(val, pdc_base + reg + i * sizeof(u32));
 }

 static u32 pdc_reg_read(int reg, u32 i)
 {
 	return readl_relaxed(pdc_base + reg + i * sizeof(u32));
 }

 static int qcom_pdc_gic_get_irqchip_state(struct irq_data *d,
 					  enum irqchip_irq_state which,
 					  bool *state)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return 0;

 	return irq_chip_get_parent_state(d, which, state);
 }

 static int qcom_pdc_gic_set_irqchip_state(struct irq_data *d,
 					  enum irqchip_irq_state which,
 					  bool value)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return 0;

 	return irq_chip_set_parent_state(d, which, value);
 }

 static void pdc_enable_intr(struct irq_data *d, bool on)
 {
 	int pin_out = d->hwirq;
 	u32 index, mask;
 	u32 enable;

 	index = pin_out / 32;
 	mask = pin_out % 32;

 	raw_spin_lock(&pdc_lock);
 	enable = pdc_reg_read(IRQ_ENABLE_BANK, index);
 	enable = on ? ENABLE_INTR(enable, mask) : CLEAR_INTR(enable, mask);
 	pdc_reg_write(IRQ_ENABLE_BANK, index, enable);
 	raw_spin_unlock(&pdc_lock);
 }

 static void qcom_pdc_gic_disable(struct irq_data *d)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return;

 	pdc_enable_intr(d, false);
 	irq_chip_disable_parent(d);
 }

 static void qcom_pdc_gic_enable(struct irq_data *d)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return;

 	pdc_enable_intr(d, true);
 	irq_chip_enable_parent(d);
 }

 static void qcom_pdc_gic_mask(struct irq_data *d)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return;

 	irq_chip_mask_parent(d);
 }

 static void qcom_pdc_gic_unmask(struct irq_data *d)
 {
 	if (d->hwirq == GPIO_NO_WAKE_IRQ)
 		return;

 	irq_chip_unmask_parent(d);
 }

 static u32 __spi_pin_read(unsigned int pin)
 {
 	void __iomem *cfg_reg = spi_cfg->base + pin * 4;
 	u64 scm_cfg_reg = spi_cfg->start + pin * 4;

 	if (spi_cfg->scm_io) {
 		unsigned int val;

 		qcom_scm_io_readl(scm_cfg_reg, &val);
 		return val;
 	} else {
 		return readl(cfg_reg);
 	}
 }

 static void __spi_pin_write(unsigned int pin, unsigned int val)
 {
 	void __iomem *cfg_reg = spi_cfg->base + pin * 4;
 	u64 scm_cfg_reg = spi_cfg->start + pin * 4;

 	if (spi_cfg->scm_io)
 		qcom_scm_io_writel(scm_cfg_reg, val);
 	else
 		writel(val, cfg_reg);
 }

 static int spi_configure_type(irq_hw_number_t hwirq, unsigned int type)
 {
 	int spi = hwirq - 32;
 	u32 pin = spi / 32;
 	u32 mask = BIT(spi % 32);
 	u32 val;
 	unsigned long flags;

 	if (!spi_cfg)
 		return 0;

 	if (pin * 4 > spi_cfg->size)
 		return -EFAULT;

 	raw_spin_lock_irqsave(&pdc_lock, flags);
 	val = __spi_pin_read(pin);
 	val &= ~mask;
 	if (type & IRQ_TYPE_LEVEL_MASK)
 		val |= mask;
 	__spi_pin_write(pin, val);
 	raw_spin_unlock_irqrestore(&pdc_lock, flags);

 	return 0;
 }

 /*
  * GIC does not handle falling edge or active low. To allow falling edge and
  * active low interrupts to be handled at GIC, PDC has an inverter that inverts
  * falling edge into a rising edge and active low into an active high.
  * For the inverter to work, the polarity bit in the IRQ_CONFIG register has to
  * set as per the table below.
  * Level sensitive active low    LOW
  * Rising edge sensitive         NOT USED
  * Falling edge sensitive        LOW
  * Dual Edge sensitive           NOT USED
  * Level sensitive active High   HIGH
  * Falling Edge sensitive        NOT USED
  * Rising edge sensitive         HIGH
  * Dual Edge sensitive           HIGH
  */
 enum pdc_irq_config_bits {
 	PDC_LEVEL_LOW		= 0b000,
 	PDC_EDGE_FALLING	= 0b010,
 	PDC_LEVEL_HIGH		= 0b100,
 	PDC_EDGE_RISING		= 0b110,
 	PDC_EDGE_DUAL		= 0b111,
 };

 /**
  * qcom_pdc_gic_set_type: Configure PDC for the interrupt
  *
  * @d: the interrupt data
  * @type: the interrupt type
  *
  * If @type is edge triggered, forward that as Rising edge as PDC
  * takes care of converting falling edge to rising edge signal
  * If @type is level, then forward that as level high as PDC
  * takes care of converting falling edge to rising edge signal
  */
 static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
 {
 	int pin_out = d->hwirq;
 	int parent_hwirq = d->parent_data->hwirq;
 	enum pdc_irq_config_bits pdc_type;
 	enum pdc_irq_config_bits old_pdc_type;
 	int ret;

 	if (pin_out == GPIO_NO_WAKE_IRQ)
 		return 0;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		pdc_type = PDC_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		pdc_type = PDC_EDGE_FALLING;
 		type = IRQ_TYPE_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		pdc_type = PDC_EDGE_DUAL;
 		type = IRQ_TYPE_EDGE_RISING;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		pdc_type = PDC_LEVEL_HIGH;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		pdc_type = PDC_LEVEL_LOW;
 		type = IRQ_TYPE_LEVEL_HIGH;
 		break;
 	default:
 		WARN_ON(1);
 		return -EINVAL;
 	}

 	old_pdc_type = pdc_reg_read(IRQ_i_CFG, pin_out);
 	pdc_reg_write(IRQ_i_CFG, pin_out, pdc_type);

 	/* Additionally, configure (only) the GPIO in the f/w */
 	ret = spi_configure_type(parent_hwirq, type);
 	if (ret)
 		return ret;

 	ret = irq_chip_set_type_parent(d, type);
 	if (ret)
 		return ret;

 	/*
 	 * When we change types the PDC can give a phantom interrupt.
 	 * Clear it.  Specifically the phantom shows up when reconfiguring
 	 * polarity of interrupt without changing the state of the signal
 	 * but let's be consistent and clear it always.
 	 *
 	 * Doing this works because we have IRQCHIP_SET_TYPE_MASKED so the
 	 * interrupt will be cleared before the rest of the system sees it.
 	 */
 	if (old_pdc_type != pdc_type)
 		irq_chip_set_parent_state(d, IRQCHIP_STATE_PENDING, false);

 	return 0;
 }

 static struct irq_chip qcom_pdc_gic_chip = {
 	.name			= "PDC",
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_mask		= qcom_pdc_gic_mask,
 	.irq_unmask		= qcom_pdc_gic_unmask,
 	.irq_disable		= qcom_pdc_gic_disable,
 	.irq_enable		= qcom_pdc_gic_enable,
 	.irq_get_irqchip_state	= qcom_pdc_gic_get_irqchip_state,
 	.irq_set_irqchip_state	= qcom_pdc_gic_set_irqchip_state,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_set_type		= qcom_pdc_gic_set_type,
 	.flags			= IRQCHIP_MASK_ON_SUSPEND |
 				  IRQCHIP_SET_TYPE_MASKED |
 				  IRQCHIP_SKIP_SET_WAKE |
 				  IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND,
 	.irq_set_vcpu_affinity	= irq_chip_set_vcpu_affinity_parent,
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 };

 static irq_hw_number_t get_parent_hwirq(int pin)
 {
 	int i;
 	struct pdc_pin_region *region;

 	for (i = 0; i < pdc_region_cnt; i++) {
 		region = &pdc_region[i];
 		if (pin >= region->pin_base &&
 		    pin < region->pin_base + region->cnt)
 			return (region->parent_base + pin - region->pin_base);
 	}

 	return PDC_NO_PARENT_IRQ;
 }

 static int qcom_pdc_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
 			      unsigned long *hwirq, unsigned int *type)
 {
 	if (is_of_node(fwspec->fwnode)) {
 		if (fwspec->param_count != 2)
 			return -EINVAL;

 		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
 		return 0;
 	}

 	return -EINVAL;
 }

 static int qcom_pdc_alloc(struct irq_domain *domain, unsigned int virq,
 			  unsigned int nr_irqs, void *data)
 {
 	struct irq_fwspec *fwspec = data;
 	struct irq_fwspec parent_fwspec;
 	irq_hw_number_t hwirq, parent_hwirq;
 	unsigned int type;
 	int ret;

 	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
 	if (ret)
 		return ret;

 	ret  = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
 					     &qcom_pdc_gic_chip, NULL);
 	if (ret)
 		return ret;

 	parent_hwirq = get_parent_hwirq(hwirq);
 	if (parent_hwirq == PDC_NO_PARENT_IRQ)
 		return 0;

 	if (type & IRQ_TYPE_EDGE_BOTH)
 		type = IRQ_TYPE_EDGE_RISING;

 	if (type & IRQ_TYPE_LEVEL_MASK)
 		type = IRQ_TYPE_LEVEL_HIGH;

 	parent_fwspec.fwnode      = domain->parent->fwnode;
 	parent_fwspec.param_count = 3;
 	parent_fwspec.param[0]    = 0;
 	parent_fwspec.param[1]    = parent_hwirq;
 	parent_fwspec.param[2]    = type;

 	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
 					    &parent_fwspec);
 }

 static const struct irq_domain_ops qcom_pdc_ops = {
 	.translate	= qcom_pdc_translate,
 	.alloc		= qcom_pdc_alloc,
 	.free		= irq_domain_free_irqs_common,
 };

 static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
 			       unsigned int nr_irqs, void *data)
 {
 	struct irq_fwspec *fwspec = data;
 	struct irq_fwspec parent_fwspec;
 	irq_hw_number_t hwirq, parent_hwirq;
 	unsigned int type;
 	int ret;

 	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
 	if (ret)
 		return ret;

 	ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
 					    &qcom_pdc_gic_chip, NULL);
 	if (ret)
 		return ret;

 	if (hwirq == GPIO_NO_WAKE_IRQ)
 		return 0;

 	parent_hwirq = get_parent_hwirq(hwirq);
 	if (parent_hwirq == PDC_NO_PARENT_IRQ)
 		return 0;

 	if (type & IRQ_TYPE_EDGE_BOTH)
 		type = IRQ_TYPE_EDGE_RISING;

 	if (type & IRQ_TYPE_LEVEL_MASK)
 		type = IRQ_TYPE_LEVEL_HIGH;

 	parent_fwspec.fwnode      = domain->parent->fwnode;
 	parent_fwspec.param_count = 3;
 	parent_fwspec.param[0]    = 0;
 	parent_fwspec.param[1]    = parent_hwirq;
 	parent_fwspec.param[2]    = type;

 	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
 					    &parent_fwspec);
 }

 static int qcom_pdc_gpio_domain_select(struct irq_domain *d,
 				       struct irq_fwspec *fwspec,
 				       enum irq_domain_bus_token bus_token)
 {
 	return bus_token == DOMAIN_BUS_WAKEUP;
 }

 static const struct irq_domain_ops qcom_pdc_gpio_ops = {
 	.select		= qcom_pdc_gpio_domain_select,
 	.alloc		= qcom_pdc_gpio_alloc,
 	.free		= irq_domain_free_irqs_common,
 };

 static int pdc_setup_pin_mapping(struct device_node *np)
 {
 	int ret, n, i;
 	u32 irq_index, reg_index, val;

 	n = of_property_count_elems_of_size(np, "qcom,pdc-ranges", sizeof(u32));
 	if (n <= 0 || n % 3)
 		return -EINVAL;

 	pdc_region_cnt = n / 3;
 	pdc_region = kcalloc(pdc_region_cnt, sizeof(*pdc_region), GFP_KERNEL);
 	if (!pdc_region) {
 		pdc_region_cnt = 0;
 		return -ENOMEM;
 	}

 	for (n = 0; n < pdc_region_cnt; n++) {
 		ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
 						 n * 3 + 0,
 						 &pdc_region[n].pin_base);
 		if (ret)
 			return ret;
 		ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
 						 n * 3 + 1,
 						 &pdc_region[n].parent_base);
 		if (ret)
 			return ret;
 		ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
 						 n * 3 + 2,
 						 &pdc_region[n].cnt);
 		if (ret)
 			return ret;

 		for (i = 0; i < pdc_region[n].cnt; i++) {
 			reg_index = (i + pdc_region[n].pin_base) >> 5;
 			irq_index = (i + pdc_region[n].pin_base) & 0x1f;
 			val = pdc_reg_read(IRQ_ENABLE_BANK, reg_index);
 			val &= ~BIT(irq_index);
 			pdc_reg_write(IRQ_ENABLE_BANK, reg_index, val);
 		}
 	}

 	return 0;
 }

 static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
 {
 	struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
 	struct resource res;
 	int ret;

 	pdc_base = of_iomap(node, 0);
 	if (!pdc_base) {
 		pr_err("%pOF: unable to map PDC registers\n", node);
 		return -ENXIO;
 	}

 	parent_domain = irq_find_host(parent);
 	if (!parent_domain) {
 		pr_err("%pOF: unable to find PDC's parent domain\n", node);
 		ret = -ENXIO;
 		goto fail;
 	}

 	ret = pdc_setup_pin_mapping(node);
 	if (ret) {
 		pr_err("%pOF: failed to init PDC pin-hwirq mapping\n", node);
 		goto fail;
 	}

 	pdc_domain = irq_domain_create_hierarchy(parent_domain, 0, PDC_MAX_IRQS,
 						 of_fwnode_handle(node),
 						 &qcom_pdc_ops, NULL);
 	if (!pdc_domain) {
 		pr_err("%pOF: GIC domain add failed\n", node);
 		ret = -ENOMEM;
 		goto fail;
 	}

 	ret = of_address_to_resource(node, 1, &res);
 	if (!ret) {
 		spi_cfg = kcalloc(1, sizeof(*spi_cfg), GFP_KERNEL);
 		if (!spi_cfg) {
 			ret = -ENOMEM;
 			goto remove;
 		}
 		spi_cfg->scm_io = of_find_property(node,
 						   "qcom,scm-spi-cfg", NULL);
 		spi_cfg->size = resource_size(&res);
 		if (spi_cfg->scm_io) {
 			spi_cfg->start = res.start;
 		} else {
 			spi_cfg->base = ioremap(res.start, spi_cfg->size);
 			if (!spi_cfg->base) {
 				ret = -ENOMEM;
 				goto remove;
 			}
 		}
 	}

 	pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain,
 					IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP,
 					PDC_MAX_GPIO_IRQS,
 					of_fwnode_handle(node),
 					&qcom_pdc_gpio_ops, NULL);
 	if (!pdc_gpio_domain) {
 		pr_err("%pOF: PDC domain add failed for GPIO domain\n", node);
 		ret = -ENOMEM;
 		goto remove;
 	}

 	irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);

 	return 0;

 remove:
 	irq_domain_remove(pdc_domain);
 	kfree(spi_cfg);
 fail:
 	kfree(pdc_region);
 	iounmap(pdc_base);
 	return ret;
 }

 static int qcom_pdc_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *parent = of_irq_find_parent(np);

 	return qcom_pdc_init(np, parent);
 }

 static const struct of_device_id qcom_pdc_match_table[] = {
 	{ .compatible = "qcom,pdc" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, qcom_pdc_match_table);

 static struct platform_driver qcom_pdc_driver = {
 	.probe = qcom_pdc_probe,
 	.driver = {
 		.name = "qcom-pdc",
 		.of_match_table = qcom_pdc_match_table,
 		.suppress_bind_attrs = true,
 	},
 };
 module_platform_driver(qcom_pdc_driver);
 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Power Domain Controller");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
	*/

	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/irqchip.h>
	#include <linux/irqdomain.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_device.h>
	#include <linux/of_irq.h>
	#include <linux/soc/qcom/irq.h>
	#include <linux/spinlock.h>
	#include <linux/slab.h>
	#include <linux/types.h>

	#include <linux/qcom_scm.h>

	#define PDC_MAX_IRQS 168
	#define PDC_MAX_GPIO_IRQS 256

	#define CLEAR_INTR(reg, intr) (reg & ~(1 << intr))
	#define ENABLE_INTR(reg, intr) (reg \| (1 << intr))

	#define IRQ_ENABLE_BANK 0x10
	#define IRQ_i_CFG 0x110

	#define PDC_NO_PARENT_IRQ ~0UL

	struct pdc_pin_region {
	u32 pin_base;
	u32 parent_base;
	u32 cnt;
	};

	struct spi_cfg_regs {
	union {
	u64 start;
	void __iomem *base;
	};
	resource_size_t size;
	bool scm_io;
	};

	static DEFINE_RAW_SPINLOCK(pdc_lock);
	static void __iomem *pdc_base;
	static struct pdc_pin_region *pdc_region;
	static int pdc_region_cnt;
	static struct spi_cfg_regs *spi_cfg;

	static void pdc_reg_write(int reg, u32 i, u32 val)
	{
	writel_relaxed(val, pdc_base + reg + i * sizeof(u32));
	}

	static u32 pdc_reg_read(int reg, u32 i)
	{
	return readl_relaxed(pdc_base + reg + i * sizeof(u32));
	}

	static int qcom_pdc_gic_get_irqchip_state(struct irq_data *d,
	enum irqchip_irq_state which,
	bool *state)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return 0;

	return irq_chip_get_parent_state(d, which, state);
	}

	static int qcom_pdc_gic_set_irqchip_state(struct irq_data *d,
	enum irqchip_irq_state which,
	bool value)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return 0;

	return irq_chip_set_parent_state(d, which, value);
	}

	static void pdc_enable_intr(struct irq_data *d, bool on)
	{
	int pin_out = d->hwirq;
	u32 index, mask;
	u32 enable;

	index = pin_out / 32;
	mask = pin_out % 32;

	raw_spin_lock(&pdc_lock);
	enable = pdc_reg_read(IRQ_ENABLE_BANK, index);
	enable = on ? ENABLE_INTR(enable, mask) : CLEAR_INTR(enable, mask);
	pdc_reg_write(IRQ_ENABLE_BANK, index, enable);
	raw_spin_unlock(&pdc_lock);
	}

	static void qcom_pdc_gic_disable(struct irq_data *d)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return;

	pdc_enable_intr(d, false);
	irq_chip_disable_parent(d);
	}

	static void qcom_pdc_gic_enable(struct irq_data *d)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return;

	pdc_enable_intr(d, true);
	irq_chip_enable_parent(d);
	}

	static void qcom_pdc_gic_mask(struct irq_data *d)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return;

	irq_chip_mask_parent(d);
	}

	static void qcom_pdc_gic_unmask(struct irq_data *d)
	{
	if (d->hwirq == GPIO_NO_WAKE_IRQ)
	return;

	irq_chip_unmask_parent(d);
	}

	static u32 __spi_pin_read(unsigned int pin)
	{
	void __iomem cfg_reg = spi_cfg->base + pin 4;
	u64 scm_cfg_reg = spi_cfg->start + pin * 4;

	if (spi_cfg->scm_io) {
	unsigned int val;

	qcom_scm_io_readl(scm_cfg_reg, &val);
	return val;
	} else {
	return readl(cfg_reg);
	}
	}

	static void __spi_pin_write(unsigned int pin, unsigned int val)
	{
	void __iomem cfg_reg = spi_cfg->base + pin 4;
	u64 scm_cfg_reg = spi_cfg->start + pin * 4;

	if (spi_cfg->scm_io)
	qcom_scm_io_writel(scm_cfg_reg, val);
	else
	writel(val, cfg_reg);
	}

	static int spi_configure_type(irq_hw_number_t hwirq, unsigned int type)
	{
	int spi = hwirq - 32;
	u32 pin = spi / 32;
	u32 mask = BIT(spi % 32);
	u32 val;
	unsigned long flags;

	if (!spi_cfg)
	return 0;

	if (pin * 4 > spi_cfg->size)
	return -EFAULT;

	raw_spin_lock_irqsave(&pdc_lock, flags);
	val = __spi_pin_read(pin);
	val &= ~mask;
	if (type & IRQ_TYPE_LEVEL_MASK)
	val \|= mask;
	__spi_pin_write(pin, val);
	raw_spin_unlock_irqrestore(&pdc_lock, flags);

	return 0;
	}

	/*
	* GIC does not handle falling edge or active low. To allow falling edge and
	* active low interrupts to be handled at GIC, PDC has an inverter that inverts
	* falling edge into a rising edge and active low into an active high.
	* For the inverter to work, the polarity bit in the IRQ_CONFIG register has to
	* set as per the table below.
	* Level sensitive active low LOW
	* Rising edge sensitive NOT USED
	* Falling edge sensitive LOW
	* Dual Edge sensitive NOT USED
	* Level sensitive active High HIGH
	* Falling Edge sensitive NOT USED
	* Rising edge sensitive HIGH
	* Dual Edge sensitive HIGH
	*/
	enum pdc_irq_config_bits {
	PDC_LEVEL_LOW = 0b000,
	PDC_EDGE_FALLING = 0b010,
	PDC_LEVEL_HIGH = 0b100,
	PDC_EDGE_RISING = 0b110,
	PDC_EDGE_DUAL = 0b111,
	};

	/**
	* qcom_pdc_gic_set_type: Configure PDC for the interrupt
	*
	* @d: the interrupt data
	* @type: the interrupt type
	*
	* If @type is edge triggered, forward that as Rising edge as PDC
	* takes care of converting falling edge to rising edge signal
	* If @type is level, then forward that as level high as PDC
	* takes care of converting falling edge to rising edge signal
	*/
	static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
	{
	int pin_out = d->hwirq;
	int parent_hwirq = d->parent_data->hwirq;
	enum pdc_irq_config_bits pdc_type;
	enum pdc_irq_config_bits old_pdc_type;
	int ret;

	if (pin_out == GPIO_NO_WAKE_IRQ)
	return 0;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	pdc_type = PDC_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	pdc_type = PDC_EDGE_FALLING;
	type = IRQ_TYPE_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	pdc_type = PDC_EDGE_DUAL;
	type = IRQ_TYPE_EDGE_RISING;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	pdc_type = PDC_LEVEL_HIGH;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	pdc_type = PDC_LEVEL_LOW;
	type = IRQ_TYPE_LEVEL_HIGH;
	break;
	default:
	WARN_ON(1);
	return -EINVAL;
	}

	old_pdc_type = pdc_reg_read(IRQ_i_CFG, pin_out);
	pdc_reg_write(IRQ_i_CFG, pin_out, pdc_type);

	/* Additionally, configure (only) the GPIO in the f/w */
	ret = spi_configure_type(parent_hwirq, type);
	if (ret)
	return ret;

	ret = irq_chip_set_type_parent(d, type);
	if (ret)
	return ret;

	/*
	* When we change types the PDC can give a phantom interrupt.
	* Clear it. Specifically the phantom shows up when reconfiguring
	* polarity of interrupt without changing the state of the signal
	* but let's be consistent and clear it always.
	*
	* Doing this works because we have IRQCHIP_SET_TYPE_MASKED so the
	* interrupt will be cleared before the rest of the system sees it.
	*/
	if (old_pdc_type != pdc_type)
	irq_chip_set_parent_state(d, IRQCHIP_STATE_PENDING, false);

	return 0;
	}

	static struct irq_chip qcom_pdc_gic_chip = {
	.name = "PDC",
	.irq_eoi = irq_chip_eoi_parent,
	.irq_mask = qcom_pdc_gic_mask,
	.irq_unmask = qcom_pdc_gic_unmask,
	.irq_disable = qcom_pdc_gic_disable,
	.irq_enable = qcom_pdc_gic_enable,
	.irq_get_irqchip_state = qcom_pdc_gic_get_irqchip_state,
	.irq_set_irqchip_state = qcom_pdc_gic_set_irqchip_state,
	.irq_retrigger = irq_chip_retrigger_hierarchy,
	.irq_set_type = qcom_pdc_gic_set_type,
	.flags = IRQCHIP_MASK_ON_SUSPEND \|
	IRQCHIP_SET_TYPE_MASKED \|
	IRQCHIP_SKIP_SET_WAKE \|
	IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND,
	.irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
	.irq_set_affinity = irq_chip_set_affinity_parent,
	};

	static irq_hw_number_t get_parent_hwirq(int pin)
	{
	int i;
	struct pdc_pin_region *region;

	for (i = 0; i < pdc_region_cnt; i++) {
	region = &pdc_region[i];
	if (pin >= region->pin_base &&
	pin < region->pin_base + region->cnt)
	return (region->parent_base + pin - region->pin_base);
	}

	return PDC_NO_PARENT_IRQ;
	}

	static int qcom_pdc_translate(struct irq_domain d, struct irq_fwspec fwspec,
	unsigned long hwirq, unsigned int type)
	{
	if (is_of_node(fwspec->fwnode)) {
	if (fwspec->param_count != 2)
	return -EINVAL;

	*hwirq = fwspec->param[0];
	*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
	return 0;
	}

	return -EINVAL;
	}

	static int qcom_pdc_alloc(struct irq_domain *domain, unsigned int virq,
	unsigned int nr_irqs, void *data)
	{
	struct irq_fwspec *fwspec = data;
	struct irq_fwspec parent_fwspec;
	irq_hw_number_t hwirq, parent_hwirq;
	unsigned int type;
	int ret;

	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
	if (ret)
	return ret;

	ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
	&qcom_pdc_gic_chip, NULL);
	if (ret)
	return ret;

	parent_hwirq = get_parent_hwirq(hwirq);
	if (parent_hwirq == PDC_NO_PARENT_IRQ)
	return 0;

	if (type & IRQ_TYPE_EDGE_BOTH)
	type = IRQ_TYPE_EDGE_RISING;

	if (type & IRQ_TYPE_LEVEL_MASK)
	type = IRQ_TYPE_LEVEL_HIGH;

	parent_fwspec.fwnode = domain->parent->fwnode;
	parent_fwspec.param_count = 3;
	parent_fwspec.param[0] = 0;
	parent_fwspec.param[1] = parent_hwirq;
	parent_fwspec.param[2] = type;

	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
	&parent_fwspec);
	}

	static const struct irq_domain_ops qcom_pdc_ops = {
	.translate = qcom_pdc_translate,
	.alloc = qcom_pdc_alloc,
	.free = irq_domain_free_irqs_common,
	};

	static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
	unsigned int nr_irqs, void *data)
	{
	struct irq_fwspec *fwspec = data;
	struct irq_fwspec parent_fwspec;
	irq_hw_number_t hwirq, parent_hwirq;
	unsigned int type;
	int ret;

	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
	if (ret)
	return ret;

	ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
	&qcom_pdc_gic_chip, NULL);
	if (ret)
	return ret;

	if (hwirq == GPIO_NO_WAKE_IRQ)
	return 0;

	parent_hwirq = get_parent_hwirq(hwirq);
	if (parent_hwirq == PDC_NO_PARENT_IRQ)
	return 0;

	if (type & IRQ_TYPE_EDGE_BOTH)
	type = IRQ_TYPE_EDGE_RISING;

	if (type & IRQ_TYPE_LEVEL_MASK)
	type = IRQ_TYPE_LEVEL_HIGH;

	parent_fwspec.fwnode = domain->parent->fwnode;
	parent_fwspec.param_count = 3;
	parent_fwspec.param[0] = 0;
	parent_fwspec.param[1] = parent_hwirq;
	parent_fwspec.param[2] = type;

	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
	&parent_fwspec);
	}

	static int qcom_pdc_gpio_domain_select(struct irq_domain *d,
	struct irq_fwspec *fwspec,
	enum irq_domain_bus_token bus_token)
	{
	return bus_token == DOMAIN_BUS_WAKEUP;
	}

	static const struct irq_domain_ops qcom_pdc_gpio_ops = {
	.select = qcom_pdc_gpio_domain_select,
	.alloc = qcom_pdc_gpio_alloc,
	.free = irq_domain_free_irqs_common,
	};

	static int pdc_setup_pin_mapping(struct device_node *np)
	{
	int ret, n, i;
	u32 irq_index, reg_index, val;

	n = of_property_count_elems_of_size(np, "qcom,pdc-ranges", sizeof(u32));
	if (n <= 0 \|\| n % 3)
	return -EINVAL;

	pdc_region_cnt = n / 3;
	pdc_region = kcalloc(pdc_region_cnt, sizeof(*pdc_region), GFP_KERNEL);
	if (!pdc_region) {
	pdc_region_cnt = 0;
	return -ENOMEM;
	}

	for (n = 0; n < pdc_region_cnt; n++) {
	ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
	n * 3 + 0,
	&pdc_region[n].pin_base);
	if (ret)
	return ret;
	ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
	n * 3 + 1,
	&pdc_region[n].parent_base);
	if (ret)
	return ret;
	ret = of_property_read_u32_index(np, "qcom,pdc-ranges",
	n * 3 + 2,
	&pdc_region[n].cnt);
	if (ret)
	return ret;

	for (i = 0; i < pdc_region[n].cnt; i++) {
	reg_index = (i + pdc_region[n].pin_base) >> 5;
	irq_index = (i + pdc_region[n].pin_base) & 0x1f;
	val = pdc_reg_read(IRQ_ENABLE_BANK, reg_index);
	val &= ~BIT(irq_index);
	pdc_reg_write(IRQ_ENABLE_BANK, reg_index, val);
	}
	}

	return 0;
	}

	static int qcom_pdc_init(struct device_node node, struct device_node parent)
	{
	struct irq_domain parent_domain, pdc_domain, *pdc_gpio_domain;
	struct resource res;
	int ret;

	pdc_base = of_iomap(node, 0);
	if (!pdc_base) {
	pr_err("%pOF: unable to map PDC registers\n", node);
	return -ENXIO;
	}

	parent_domain = irq_find_host(parent);
	if (!parent_domain) {
	pr_err("%pOF: unable to find PDC's parent domain\n", node);
	ret = -ENXIO;
	goto fail;
	}

	ret = pdc_setup_pin_mapping(node);
	if (ret) {
	pr_err("%pOF: failed to init PDC pin-hwirq mapping\n", node);
	goto fail;
	}

	pdc_domain = irq_domain_create_hierarchy(parent_domain, 0, PDC_MAX_IRQS,
	of_fwnode_handle(node),
	&qcom_pdc_ops, NULL);
	if (!pdc_domain) {
	pr_err("%pOF: GIC domain add failed\n", node);
	ret = -ENOMEM;
	goto fail;
	}

	ret = of_address_to_resource(node, 1, &res);
	if (!ret) {
	spi_cfg = kcalloc(1, sizeof(*spi_cfg), GFP_KERNEL);
	if (!spi_cfg) {
	ret = -ENOMEM;
	goto remove;
	}
	spi_cfg->scm_io = of_find_property(node,
	"qcom,scm-spi-cfg", NULL);
	spi_cfg->size = resource_size(&res);
	if (spi_cfg->scm_io) {
	spi_cfg->start = res.start;
	} else {
	spi_cfg->base = ioremap(res.start, spi_cfg->size);
	if (!spi_cfg->base) {
	ret = -ENOMEM;
	goto remove;
	}
	}
	}

	pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain,
	IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP,
	PDC_MAX_GPIO_IRQS,
	of_fwnode_handle(node),
	&qcom_pdc_gpio_ops, NULL);
	if (!pdc_gpio_domain) {
	pr_err("%pOF: PDC domain add failed for GPIO domain\n", node);
	ret = -ENOMEM;
	goto remove;
	}

	irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);

	return 0;

	remove:
	irq_domain_remove(pdc_domain);
	kfree(spi_cfg);
	fail:
	kfree(pdc_region);
	iounmap(pdc_base);
	return ret;
	}

	static int qcom_pdc_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct device_node *parent = of_irq_find_parent(np);

	return qcom_pdc_init(np, parent);
	}

	static const struct of_device_id qcom_pdc_match_table[] = {
	{ .compatible = "qcom,pdc" },
	{}
	};
	MODULE_DEVICE_TABLE(of, qcom_pdc_match_table);

	static struct platform_driver qcom_pdc_driver = {
	.probe = qcom_pdc_probe,
	.driver = {
	.name = "qcom-pdc",
	.of_match_table = qcom_pdc_match_table,
	.suppress_bind_attrs = true,
	},
	};
	module_platform_driver(qcom_pdc_driver);
	MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Power Domain Controller");
	MODULE_LICENSE("GPL v2");