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1// SPDX-License-Identifier: GPL-2.02/* Driver for IDT/Renesas 79RC3243x Interrupt Controller  */3 4#include <linux/bitops.h>5#include <linux/gpio/driver.h>6#include <linux/irq.h>7#include <linux/module.h>8#include <linux/mod_devicetable.h>9#include <linux/platform_device.h>10#include <linux/spinlock.h>11 12#define IDT_PIC_IRQ_PEND	0x0013#define IDT_PIC_IRQ_MASK	0x0814 15#define IDT_GPIO_DIR		0x0016#define IDT_GPIO_DATA		0x0417#define IDT_GPIO_ILEVEL		0x0818#define IDT_GPIO_ISTAT		0x0C19 20struct idt_gpio_ctrl {21	struct gpio_chip gc;22	void __iomem *pic;23	void __iomem *gpio;24	u32 mask_cache;25};26 27static void idt_gpio_dispatch(struct irq_desc *desc)28{29	struct gpio_chip *gc = irq_desc_get_handler_data(desc);30	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);31	struct irq_chip *host_chip = irq_desc_get_chip(desc);32	unsigned int bit, virq;33	unsigned long pending;34 35	chained_irq_enter(host_chip, desc);36 37	pending = readl(ctrl->pic + IDT_PIC_IRQ_PEND);38	pending &= ~ctrl->mask_cache;39	for_each_set_bit(bit, &pending, gc->ngpio) {40		virq = irq_linear_revmap(gc->irq.domain, bit);41		if (virq)42			generic_handle_irq(virq);43	}44 45	chained_irq_exit(host_chip, desc);46}47 48static int idt_gpio_irq_set_type(struct irq_data *d, unsigned int flow_type)49{50	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);51	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);52	unsigned int sense = flow_type & IRQ_TYPE_SENSE_MASK;53	unsigned long flags;54	u32 ilevel;55 56	/* hardware only supports level triggered */57	if (sense == IRQ_TYPE_NONE || (sense & IRQ_TYPE_EDGE_BOTH))58		return -EINVAL;59 60	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);61 62	ilevel = readl(ctrl->gpio + IDT_GPIO_ILEVEL);63	if (sense & IRQ_TYPE_LEVEL_HIGH)64		ilevel |= BIT(d->hwirq);65	else if (sense & IRQ_TYPE_LEVEL_LOW)66		ilevel &= ~BIT(d->hwirq);67 68	writel(ilevel, ctrl->gpio + IDT_GPIO_ILEVEL);69	irq_set_handler_locked(d, handle_level_irq);70 71	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);72	return 0;73}74 75static void idt_gpio_ack(struct irq_data *d)76{77	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);78	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);79 80	writel(~BIT(d->hwirq), ctrl->gpio + IDT_GPIO_ISTAT);81}82 83static void idt_gpio_mask(struct irq_data *d)84{85	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);86	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);87	unsigned long flags;88 89	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);90 91	ctrl->mask_cache |= BIT(d->hwirq);92	writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);93 94	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);95 96	gpiochip_disable_irq(gc, irqd_to_hwirq(d));97}98 99static void idt_gpio_unmask(struct irq_data *d)100{101	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);102	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);103	unsigned long flags;104 105	gpiochip_enable_irq(gc, irqd_to_hwirq(d));106	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);107 108	ctrl->mask_cache &= ~BIT(d->hwirq);109	writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);110 111	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);112}113 114static int idt_gpio_irq_init_hw(struct gpio_chip *gc)115{116	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);117 118	/* Mask interrupts. */119	ctrl->mask_cache = 0xffffffff;120	writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);121 122	return 0;123}124 125static const struct irq_chip idt_gpio_irqchip = {126	.name = "IDTGPIO",127	.irq_mask = idt_gpio_mask,128	.irq_ack = idt_gpio_ack,129	.irq_unmask = idt_gpio_unmask,130	.irq_set_type = idt_gpio_irq_set_type,131	.flags = IRQCHIP_IMMUTABLE,132	GPIOCHIP_IRQ_RESOURCE_HELPERS,133};134 135static int idt_gpio_probe(struct platform_device *pdev)136{137	struct device *dev = &pdev->dev;138	struct gpio_irq_chip *girq;139	struct idt_gpio_ctrl *ctrl;140	int parent_irq;141	int ngpios;142	int ret;143 144 145	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);146	if (!ctrl)147		return -ENOMEM;148 149	ctrl->gpio = devm_platform_ioremap_resource_byname(pdev, "gpio");150	if (IS_ERR(ctrl->gpio))151		return PTR_ERR(ctrl->gpio);152 153	ctrl->gc.parent = dev;154 155	ret = bgpio_init(&ctrl->gc, &pdev->dev, 4, ctrl->gpio + IDT_GPIO_DATA,156			 NULL, NULL, ctrl->gpio + IDT_GPIO_DIR, NULL, 0);157	if (ret) {158		dev_err(dev, "bgpio_init failed\n");159		return ret;160	}161 162	ret = device_property_read_u32(dev, "ngpios", &ngpios);163	if (!ret)164		ctrl->gc.ngpio = ngpios;165 166	if (device_property_read_bool(dev, "interrupt-controller")) {167		ctrl->pic = devm_platform_ioremap_resource_byname(pdev, "pic");168		if (IS_ERR(ctrl->pic))169			return PTR_ERR(ctrl->pic);170 171		parent_irq = platform_get_irq(pdev, 0);172		if (parent_irq < 0)173			return parent_irq;174 175		girq = &ctrl->gc.irq;176		gpio_irq_chip_set_chip(girq, &idt_gpio_irqchip);177		girq->init_hw = idt_gpio_irq_init_hw;178		girq->parent_handler = idt_gpio_dispatch;179		girq->num_parents = 1;180		girq->parents = devm_kcalloc(dev, girq->num_parents,181					     sizeof(*girq->parents),182					     GFP_KERNEL);183		if (!girq->parents)184			return -ENOMEM;185 186		girq->parents[0] = parent_irq;187		girq->default_type = IRQ_TYPE_NONE;188		girq->handler = handle_bad_irq;189	}190 191	return devm_gpiochip_add_data(&pdev->dev, &ctrl->gc, ctrl);192}193 194static const struct of_device_id idt_gpio_of_match[] = {195	{ .compatible = "idt,32434-gpio" },196	{ }197};198MODULE_DEVICE_TABLE(of, idt_gpio_of_match);199 200static struct platform_driver idt_gpio_driver = {201	.probe = idt_gpio_probe,202	.driver = {203		.name = "idt3243x-gpio",204		.of_match_table = idt_gpio_of_match,205	},206};207module_platform_driver(idt_gpio_driver);208 209MODULE_DESCRIPTION("IDT 79RC3243x GPIO/PIC Driver");210MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");211MODULE_LICENSE("GPL");212