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

#include <linux/bitfield.h>
#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_irq.h>
#include <linux/soc/qcom/irq.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/firmware/qcom/qcom_scm.h>

#define PDC_MAX_IRQS			256
#define IRQ_ENABLE_BANK_MAX		BITS_TO_BYTES(PDC_MAX_IRQS)
#define IRQ_ENABLE_BANK_INDEX_MASK	GENMASK(31, 5)
#define IRQ_ENABLE_BANK_BIT_MASK	GENMASK(4, 0)

/* Secure DRV register to configure the PDC mode via qcom_scm_io_writel() */
#define PDC_GPIO_INT_CTL_ENABLE		0xb2045e8
#define PDC_PASS_THROUGH_MODE		0x0
#define PDC_SECONDARY_MODE		0x1

#define PDC_DRV_SIZE			0x10000
#define PDC_VERSION_REG			0x1000
#define PDC_VERSION_MAJOR		GENMASK(23, 16)
#define PDC_VERSION_MINOR		GENMASK(15, 8)
#define PDC_VERSION_STEP		GENMASK(7, 0)
#define PDC_VERSION(maj, min, step)	(FIELD_PREP(PDC_VERSION_MAJOR, (maj)) | \
					 FIELD_PREP(PDC_VERSION_MINOR, (min)) | \
					 FIELD_PREP(PDC_VERSION_STEP,  (step)))

/* Notable PDC versions */
#define PDC_VERSION_3_2			PDC_VERSION(3, 2, 0)
#define PDC_VERSION_3_0			PDC_VERSION(3, 0, 0)
#define PDC_VERSION_2_7			PDC_VERSION(2, 7, 0)

/*
 * PDC Hardware registers layout per version:
 *
 * IRQ_ENABLE_BANK[b], b = 0....BITS_TO_BYTES(PDC_MAX_IRQS)
 * IRQ_CFG[n], n = 0....PDC_MAX_IRQS
 *
 * +---------------------------------------------------------------+
 * |       v2.7        |       v3.0        |       v3.2            |
 * |---------------------------------------------------------------|
 * |       BASE        |       BASE        |       BASE            |
 * |---------------------------------------------------------------|
 * |                                                               |
 * |   IRQ_ENABLE_BANK | IRQ_ENABLE_BANK   |       NA              |
 * |---------------------------------------------------------------|
 * |   IRQ_CFG         | IRQ_CFG           | IRQ_CFG               |
 * |                   |                   |                       |
 * |                   |                   | [31:6] Unused         |
 * |                   | [31:5] Unused     |    [5] GPIO_STATUS    |
 * |                   |    [4] GPIO_STATUS|    [4] GPIO_MASK      |
 * |   [31:3] Unused   |    [3] GPIO_MASK  |    [3] IRQ_ENABLE     |
 * |    [0:2] Type     |  [0:2] Type       |  [0:2] Type           |
 * |---------------------------------------------------------------|
 * |   IRQ_PARAM       | IRQ_PARAM         | IRQ_PARAM             |
 * |                   |                                           |
 * |   [15:8] NUM_GPIO | [15:8] NUM_GPIO   | [15:8] NUM_GPIO       |
 * |    [7:0] NUM_SPI  |  [7:0] NUM_SPI    |  [7:0] NUM_SPI        |
 * +---------------------------------------------------------------+
 */

/**
 * struct pdc_regs: PDC registers location
 *
 * @irq_en_reg:     IRQ_ENABLE_BANK register location
 * @irq_cfg_reg:    IRQ_CFG register location
 * @irq_param_reg:  IRQ_PARAM register location
 */
struct pdc_regs {
	u32	irq_en_reg;
	u32	irq_cfg_reg;
	u32	irq_param_reg;
};

/**
 * struct pdc_irq_cfg: bit fields for PDC IRQ_CFG register
 *
 * @gpio_irq_sts:   bit number for GPIO_STATUS field
 * @gpio_irq_mask:  bit number for GPIO_MASK field
 * @irq_enable:     bit number for IRQ_ENABLE field
 * @irq_type:       GENMASK for IRQ_TYPE field
 */
struct pdc_irq_cfg {
	u32	gpio_irq_sts;
	u32	gpio_irq_mask;
	u32	irq_enable;
	u32	irq_type;
};

/**
 * struct pdc_desc: PDC driver state
 *
 * @base:           PDC base register for DRV2 / HLOS
 * @prev_base:      PDC DRV1 base, applicable only for x1e RTL bug.
 * @version:        PDC version
 * @num_spis:       Total number of direct SPI interrupts
 * @region:         PDC interrupt continuous range
 * @region_cnt:     Total PDC ranges
 * @mode:           PDC_PASS_THROUGH_MODE or PDC_SECONDARY_MODE
 * @x1e_quirk:      x1e H/W Bug handling
 * @lock:           lock for IRQ_ENABLE_BANK protection
 * @regs:           PDC regs (IRQ_ENABLE_BANK and IRQ_CFG)
 * @cfg_fields:     Fields of IRQ_CFG reg
 * @enable_intr:    pointer to enable function based on PDC version
 * @unmask_gpio:    pointer to GPIO irq unmask function
 * @clear_gpio:     pointer to GPIO irq clear function
 */
struct pdc_desc {
	void __iomem			*base;
	void __iomem			*prev_base;
	u32				version;
	u32				num_spis;

	struct pdc_pin_region		*region;
	int				region_cnt;

	bool				x1e_quirk;

	u8				mode;
	raw_spinlock_t			lock;

	const struct pdc_regs		*regs;
	const struct pdc_irq_cfg	*cfg_fields;

	void (*enable_intr)(int pin_out, bool on);
	void (*unmask_gpio)(int pin_out, bool on);
	void (*clear_gpio)(int pin_out);
};

static const struct pdc_regs pdc_v3_2 = {
	.irq_cfg_reg	= 0x110,
	.irq_param_reg	= 0x100c,
};

static const struct pdc_irq_cfg pdc_cfg_v3_2 = {
	.gpio_irq_sts	= 5,
	.gpio_irq_mask	= 4,
	.irq_enable	= 3,
	.irq_type	= GENMASK(2, 0),
};

static const struct pdc_regs pdc_v3_0 = {
	.irq_en_reg	= 0x10,
	.irq_cfg_reg	= 0x110,
	.irq_param_reg	= 0x100c,
};

static const struct pdc_irq_cfg pdc_cfg_v3_0 = {
	.gpio_irq_sts	= 4,
	.gpio_irq_mask	= 3,
	.irq_type	= GENMASK(2, 0),
};

static const struct pdc_regs pdc_v2_7 = {
	.irq_en_reg	= 0x10,
	.irq_cfg_reg	= 0x110,
	.irq_param_reg	= 0x100c,
};

static const struct pdc_irq_cfg pdc_cfg_v2_7 = {
	.irq_type	= GENMASK(2, 0),
};

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

#define pin_to_hwirq(r, p)	((r)->parent_base + (p) - (r)->pin_base)

static struct pdc_desc *pdc;

static void pdc_base_reg_write(void __iomem *base, int reg, u32 i, u32 val)
{
	writel_relaxed(val, base + reg + i * sizeof(u32));
}

static void pdc_reg_write(int reg, u32 i, u32 val)
{
	pdc_base_reg_write(pdc->base, reg, i, val);
}

static u32 pdc_reg_read(int reg, u32 i)
{
	return readl_relaxed(pdc->base + reg + i * sizeof(u32));
}

static inline bool pdc_pin_is_gpio(int pin_out)
{
	/*
	 * PDC allocates direct SPIs at the beginning and
	 * all GPIOs as SPIs are allocated after direct SPIs.
	 */
	return pin_out >= pdc->num_spis;
}

static void pdc_x1e_irq_enable_write(u32 bank, u32 enable)
{
	void __iomem *base;

	/* Remap the write access to work around a hardware bug on X1E */
	switch (bank) {
	case 0 ... 1:
		/* Use previous DRV (client) region and shift to bank 3-4 */
		base = pdc->prev_base;
		bank += 3;
		break;
	case 2 ... 4:
		/* Use our own region and shift to bank 0-2 */
		base = pdc->base;
		bank -= 2;
		break;
	case 5:
		/* No fixup required for bank 5 */
		base = pdc->base;
		break;
	default:
		WARN_ON(1);
		return;
	}

	pdc_base_reg_write(base, pdc->regs->irq_en_reg, bank, enable);
}

static void pdc_enable_intr_bank(int pin_out, bool on)
{
	unsigned long enable;
	u32 index, mask;

	index = FIELD_GET(IRQ_ENABLE_BANK_INDEX_MASK, pin_out);
	mask = FIELD_GET(IRQ_ENABLE_BANK_BIT_MASK, pin_out);

	guard(raw_spinlock_irqsave)(&pdc->lock);

	enable = pdc_reg_read(pdc->regs->irq_en_reg, index);
	__assign_bit(mask, &enable, on);

	if (pdc->x1e_quirk)
		pdc_x1e_irq_enable_write(index, enable);
	else
		pdc_reg_write(pdc->regs->irq_en_reg, index, enable);
}

static void pdc_clear_gpio_cfg(int pin_out)
{
	unsigned long gpio_sts;

	gpio_sts = pdc_reg_read(pdc->regs->irq_cfg_reg, pin_out);
	__clear_bit(pdc->cfg_fields->gpio_irq_sts, &gpio_sts);
	pdc_reg_write(pdc->regs->irq_cfg_reg, pin_out, gpio_sts);
}

static void pdc_unmask_gpio_cfg(int pin_out, bool unmask)
{
	unsigned long gpio_mask;

	gpio_mask = pdc_reg_read(pdc->regs->irq_cfg_reg, pin_out);
	__assign_bit(pdc->cfg_fields->gpio_irq_mask, &gpio_mask, !unmask);
	pdc_reg_write(pdc->regs->irq_cfg_reg, pin_out, gpio_mask);
}

static void pdc_enable_intr_cfg(int pin_out, bool on)
{
	unsigned long enable = pdc_reg_read(pdc->regs->irq_cfg_reg, pin_out);

	__assign_bit(pdc->cfg_fields->irq_enable, &enable, on);
	pdc_reg_write(pdc->regs->irq_cfg_reg, pin_out, enable);
}

static void qcom_pdc_gic_secondary_disable(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, false);
	pdc->unmask_gpio(d->hwirq, false);
	irq_chip_disable_parent(d);
}

static void qcom_pdc_gic_disable(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, false);
	irq_chip_disable_parent(d);
}

static void qcom_pdc_gic_enable(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, true);
	irq_chip_enable_parent(d);
}

static void qcom_pdc_gic_secondary_enable(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, true);
	pdc->unmask_gpio(d->hwirq, true);
	irq_chip_enable_parent(d);
}

static void qcom_pdc_secondary_ack(struct irq_data *d)
{
	if (!irqd_is_level_type(d))
		pdc->clear_gpio(d->hwirq);
}

static void qcom_pdc_gic_secondary_eoi(struct irq_data *d)
{
	if (irqd_is_level_type(d))
		pdc->clear_gpio(d->hwirq);

	irq_chip_eoi_parent(d);
}

static void qcom_pdc_secondary_mask(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, false);
	pdc->unmask_gpio(d->hwirq, false);
	irq_chip_mask_parent(d);
}

static void qcom_pdc_secondary_unmask(struct irq_data *d)
{
	pdc->enable_intr(d->hwirq, true);
	pdc->unmask_gpio(d->hwirq, true);
	irq_chip_unmask_parent(d);
}

/*
 * 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 all edge types to rising edge signal
 * If @type is level, then forward that as level high as PDC
 * takes care of converting all level types to level high signal
 */
static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
{
	enum pdc_irq_config_bits old_pdc_type;
	enum pdc_irq_config_bits pdc_type;
	int ret;

	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(pdc->regs->irq_cfg_reg, d->hwirq);
	pdc_type |= (old_pdc_type & ~pdc->cfg_fields->irq_type);
	pdc_reg_write(pdc->regs->irq_cfg_reg, d->hwirq, pdc_type);

	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;
}

/**
 * qcom_pdc_gic_secondary_set_type: Configure PDC for the interrupt in secondary mode
 *
 * @d:    the interrupt data
 * @type: the interrupt type
 *
 * All @type are forwarded as level high type to parent GIC
 */
static int qcom_pdc_gic_secondary_set_type(struct irq_data *d, unsigned int type)
{
	enum pdc_irq_config_bits old_pdc_type;
	enum pdc_irq_config_bits pdc_type;
	int ret;

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

	old_pdc_type = pdc_reg_read(pdc->regs->irq_cfg_reg, d->hwirq);
	pdc_type |= (old_pdc_type & ~pdc->cfg_fields->irq_type);
	pdc_reg_write(pdc->regs->irq_cfg_reg, d->hwirq, pdc_type);

	/*
	 * PDC forwards GPIOs as level high to GIC in secondary
	 * mode. Update the type and clear any previously latched
	 * phantom interrupt at PDC.
	 */
	type = IRQ_TYPE_LEVEL_HIGH;
	pdc->clear_gpio(d->hwirq);

	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		= irq_chip_mask_parent,
	.irq_unmask		= irq_chip_unmask_parent,
	.irq_disable		= qcom_pdc_gic_disable,
	.irq_enable		= qcom_pdc_gic_enable,
	.irq_get_irqchip_state	= irq_chip_get_parent_state,
	.irq_set_irqchip_state	= irq_chip_set_parent_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 struct irq_chip qcom_pdc_gic_secondary_chip = {
	.name			= "PDC",
	.irq_ack		= qcom_pdc_secondary_ack,
	.irq_eoi		= qcom_pdc_gic_secondary_eoi,
	.irq_mask		= qcom_pdc_secondary_mask,
	.irq_unmask		= qcom_pdc_secondary_unmask,
	.irq_disable		= qcom_pdc_gic_secondary_disable,
	.irq_enable		= qcom_pdc_gic_secondary_enable,
	.irq_get_irqchip_state	= irq_chip_get_parent_state,
	.irq_set_irqchip_state	= irq_chip_set_parent_state,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_type		= qcom_pdc_gic_secondary_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 struct pdc_pin_region *get_pin_region(int pin)
{
	for (int i = 0; i < pdc->region_cnt; i++) {
		if (pin >= pdc->region[i].pin_base &&
		    pin < pdc->region[i].pin_base + pdc->region[i].cnt)
			return &pdc->region[i];
	}

	return NULL;
}

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;
	struct pdc_pin_region *region;
	irq_hw_number_t hwirq;
	unsigned int type;
	int ret;

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

	if (hwirq == GPIO_NO_WAKE_IRQ)
		return irq_domain_disconnect_hierarchy(domain, virq);

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

	/*
	 * PDC secondary chip is only set for the GPIO interrupts as SPIs.
	 * Direct SPI interrupts are still in pass through mode (no latching
	 * at PDC).
	 */
	if (pdc->mode == PDC_SECONDARY_MODE && pdc_pin_is_gpio(hwirq)) {
		ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
						    &qcom_pdc_gic_secondary_chip,
						    NULL);
		if (ret)
			return ret;

		/* Secondary mode converts all interrupts to LEVEL HIGH type */
		type = IRQ_TYPE_LEVEL_HIGH;
	} else {
		ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
						    &qcom_pdc_gic_chip,
						    NULL);
		if (ret)
			return ret;

		if (type & IRQ_TYPE_EDGE_BOTH)
			type = IRQ_TYPE_EDGE_RISING;

		if (type & IRQ_TYPE_LEVEL_MASK)
			type = IRQ_TYPE_LEVEL_HIGH;
	}

	region = get_pin_region(hwirq);
	if (!region)
		return irq_domain_disconnect_hierarchy(domain->parent, virq);

	parent_fwspec.fwnode      = domain->parent->fwnode;
	parent_fwspec.param_count = 3;
	parent_fwspec.param[0]    = 0;
	parent_fwspec.param[1]    = pin_to_hwirq(region, 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	= irq_domain_translate_twocell,
	.alloc		= qcom_pdc_alloc,
	.free		= irq_domain_free_irqs_common,
};

static int pdc_setup_pin_mapping(struct device *dev)
{
	struct device_node *np = dev->of_node;
	int ret, n;

	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 = devm_kcalloc(dev, 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 (int i = 0; i < pdc->region[n].cnt; i++) {
			if (pdc_pin_is_gpio(i + pdc->region[n].pin_base) &&
			    pdc->mode == PDC_SECONDARY_MODE)
				pdc->clear_gpio(i + pdc->region[n].pin_base);

			pdc->enable_intr(i + pdc->region[n].pin_base, false);
		}
	}

	return 0;
}

static int qcom_pdc_probe(struct platform_device *pdev, struct device_node *parent)
{
	struct irq_domain *parent_domain, *pdc_domain;
	struct device_node *node = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	resource_size_t res_size;
	struct resource res;
	u32 irq_param;
	int ret;

	/* compat with old sm8150 DT which had very small region for PDC */
	if (of_address_to_resource(node, 0, &res))
		return -EINVAL;

	res_size = max_t(resource_size_t, resource_size(&res), PDC_DRV_SIZE);
	if (res_size > resource_size(&res))
		pr_warn("%pOF: invalid reg size, please fix DT\n", node);

	pdc = devm_kzalloc(dev, sizeof(*pdc), GFP_KERNEL);
	if (!pdc)
		return -ENOMEM;

	pdc->base = devm_ioremap(dev, res.start, res_size);
	if (!pdc->base) {
		pr_err("%pOF: unable to map PDC registers\n", node);
		return -ENXIO;
	}

	pdc->version = pdc_reg_read(PDC_VERSION_REG, 0);

	if (pdc->version >= PDC_VERSION_3_2) {
		pdc->cfg_fields = &pdc_cfg_v3_2;
		pdc->regs = &pdc_v3_2;
		pdc->enable_intr = pdc_enable_intr_cfg;
	} else if (pdc->version >= PDC_VERSION_3_0) {
		pdc->cfg_fields = &pdc_cfg_v3_0;
		pdc->regs = &pdc_v3_0;
		pdc->enable_intr = pdc_enable_intr_bank;
	} else {
		pdc->cfg_fields = &pdc_cfg_v2_7;
		pdc->regs = &pdc_v2_7;
		pdc->enable_intr = pdc_enable_intr_bank;
	}

	pdc->mode = PDC_PASS_THROUGH_MODE;

	/*
	 * PDC has multiple DRV regions, each one provides the same set of
	 * registers for a particular client in the system. Due to a hardware
	 * bug on X1E, some writes to the IRQ_ENABLE_BANK register must be
	 * issued inside the previous region. This region belongs to
	 * a different client and is not described in the device tree. Map the
	 * region with the expected offset to preserve support for old DTs.
	 */
	if (of_device_is_compatible(node, "qcom,x1e80100-pdc")) {
		pdc->prev_base = devm_ioremap(dev, res.start - PDC_DRV_SIZE,
					      pdc->regs->irq_en_reg + IRQ_ENABLE_BANK_MAX);
		if (!pdc->prev_base) {
			pr_err("%pOF: unable to map previous PDC DRV region\n", node);
			return -ENXIO;
		}

		pdc->x1e_quirk = true;

		if (!qcom_scm_is_available())
			return -EPROBE_DEFER;

		ret = qcom_scm_io_writel(PDC_GPIO_INT_CTL_ENABLE, PDC_PASS_THROUGH_MODE);
		if (ret) {
			pdc->mode = PDC_SECONDARY_MODE;
			pdc->unmask_gpio = pdc_unmask_gpio_cfg;
			pdc->clear_gpio = pdc_clear_gpio_cfg;
		}
	}

	irq_param = pdc_reg_read(pdc->regs->irq_param_reg, 0);
	pdc->num_spis = FIELD_GET(GENMASK(7, 0), irq_param);

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

	raw_spin_lock_init(&pdc->lock);

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

	pdc_domain = irq_domain_create_hierarchy(parent_domain, IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP,
						 PDC_MAX_IRQS, of_fwnode_handle(node),
						 &qcom_pdc_ops, NULL);
	if (!pdc_domain) {
		pr_err("%pOF: PDC domain add failed\n", node);
		return -ENOMEM;
	}

	irq_domain_update_bus_token(pdc_domain, DOMAIN_BUS_WAKEUP);

	return 0;
}

IRQCHIP_PLATFORM_DRIVER_BEGIN(qcom_pdc)
IRQCHIP_MATCH("qcom,pdc", qcom_pdc_probe)
IRQCHIP_PLATFORM_DRIVER_END(qcom_pdc)
MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Power Domain Controller");
MODULE_LICENSE("GPL v2");