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- // SPDX-License-Identifier: GPL-2.0
- /* Driver for IDT/Renesas 79RC3243x Interrupt Controller */
- #include <linux/bitops.h>
- #include <linux/gpio/driver.h>
- #include <linux/irq.h>
- #include <linux/module.h>
- #include <linux/mod_devicetable.h>
- #include <linux/platform_device.h>
- #include <linux/spinlock.h>
- #define IDT_PIC_IRQ_PEND 0x00
- #define IDT_PIC_IRQ_MASK 0x08
- #define IDT_GPIO_DIR 0x00
- #define IDT_GPIO_DATA 0x04
- #define IDT_GPIO_ILEVEL 0x08
- #define IDT_GPIO_ISTAT 0x0C
- struct idt_gpio_ctrl {
- struct gpio_chip gc;
- void __iomem *pic;
- void __iomem *gpio;
- u32 mask_cache;
- };
- static void idt_gpio_dispatch(struct irq_desc *desc)
- {
- struct gpio_chip *gc = irq_desc_get_handler_data(desc);
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- struct irq_chip *host_chip = irq_desc_get_chip(desc);
- unsigned int bit, virq;
- unsigned long pending;
- chained_irq_enter(host_chip, desc);
- pending = readl(ctrl->pic + IDT_PIC_IRQ_PEND);
- pending &= ~ctrl->mask_cache;
- for_each_set_bit(bit, &pending, gc->ngpio) {
- virq = irq_linear_revmap(gc->irq.domain, bit);
- if (virq)
- generic_handle_irq(virq);
- }
- chained_irq_exit(host_chip, desc);
- }
- static int idt_gpio_irq_set_type(struct irq_data *d, unsigned int flow_type)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- unsigned int sense = flow_type & IRQ_TYPE_SENSE_MASK;
- unsigned long flags;
- u32 ilevel;
- /* hardware only supports level triggered */
- if (sense == IRQ_TYPE_NONE || (sense & IRQ_TYPE_EDGE_BOTH))
- return -EINVAL;
- raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
- ilevel = readl(ctrl->gpio + IDT_GPIO_ILEVEL);
- if (sense & IRQ_TYPE_LEVEL_HIGH)
- ilevel |= BIT(d->hwirq);
- else if (sense & IRQ_TYPE_LEVEL_LOW)
- ilevel &= ~BIT(d->hwirq);
- writel(ilevel, ctrl->gpio + IDT_GPIO_ILEVEL);
- irq_set_handler_locked(d, handle_level_irq);
- raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
- return 0;
- }
- static void idt_gpio_ack(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- writel(~BIT(d->hwirq), ctrl->gpio + IDT_GPIO_ISTAT);
- }
- static void idt_gpio_mask(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- unsigned long flags;
- raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
- ctrl->mask_cache |= BIT(d->hwirq);
- writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);
- raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
- }
- static void idt_gpio_unmask(struct irq_data *d)
- {
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- unsigned long flags;
- raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
- ctrl->mask_cache &= ~BIT(d->hwirq);
- writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);
- raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
- }
- static int idt_gpio_irq_init_hw(struct gpio_chip *gc)
- {
- struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
- /* Mask interrupts. */
- ctrl->mask_cache = 0xffffffff;
- writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);
- return 0;
- }
- static struct irq_chip idt_gpio_irqchip = {
- .name = "IDTGPIO",
- .irq_mask = idt_gpio_mask,
- .irq_ack = idt_gpio_ack,
- .irq_unmask = idt_gpio_unmask,
- .irq_set_type = idt_gpio_irq_set_type
- };
- static int idt_gpio_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct gpio_irq_chip *girq;
- struct idt_gpio_ctrl *ctrl;
- int parent_irq;
- int ngpios;
- int ret;
- ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
- if (!ctrl)
- return -ENOMEM;
- ctrl->gpio = devm_platform_ioremap_resource_byname(pdev, "gpio");
- if (IS_ERR(ctrl->gpio))
- return PTR_ERR(ctrl->gpio);
- ctrl->gc.parent = dev;
- ret = bgpio_init(&ctrl->gc, &pdev->dev, 4, ctrl->gpio + IDT_GPIO_DATA,
- NULL, NULL, ctrl->gpio + IDT_GPIO_DIR, NULL, 0);
- if (ret) {
- dev_err(dev, "bgpio_init failed\n");
- return ret;
- }
- ret = device_property_read_u32(dev, "ngpios", &ngpios);
- if (!ret)
- ctrl->gc.ngpio = ngpios;
- if (device_property_read_bool(dev, "interrupt-controller")) {
- ctrl->pic = devm_platform_ioremap_resource_byname(pdev, "pic");
- if (IS_ERR(ctrl->pic))
- return PTR_ERR(ctrl->pic);
- parent_irq = platform_get_irq(pdev, 0);
- if (parent_irq < 0)
- return parent_irq;
- girq = &ctrl->gc.irq;
- girq->chip = &idt_gpio_irqchip;
- girq->init_hw = idt_gpio_irq_init_hw;
- girq->parent_handler = idt_gpio_dispatch;
- girq->num_parents = 1;
- girq->parents = devm_kcalloc(dev, girq->num_parents,
- sizeof(*girq->parents),
- GFP_KERNEL);
- if (!girq->parents)
- return -ENOMEM;
- girq->parents[0] = parent_irq;
- girq->default_type = IRQ_TYPE_NONE;
- girq->handler = handle_bad_irq;
- }
- return devm_gpiochip_add_data(&pdev->dev, &ctrl->gc, ctrl);
- }
- static const struct of_device_id idt_gpio_of_match[] = {
- { .compatible = "idt,32434-gpio" },
- { }
- };
- MODULE_DEVICE_TABLE(of, idt_gpio_of_match);
- static struct platform_driver idt_gpio_driver = {
- .probe = idt_gpio_probe,
- .driver = {
- .name = "idt3243x-gpio",
- .of_match_table = idt_gpio_of_match,
- },
- };
- module_platform_driver(idt_gpio_driver);
- MODULE_DESCRIPTION("IDT 79RC3243x GPIO/PIC Driver");
- MODULE_AUTHOR("Thomas Bogendoerfer <[email protected]>");
- MODULE_LICENSE("GPL");
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