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path: root/drivers/gpio/gpio-idt3243x.c
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Diffstat (limited to 'drivers/gpio/gpio-idt3243x.c')
-rw-r--r--drivers/gpio/gpio-idt3243x.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-idt3243x.c b/drivers/gpio/gpio-idt3243x.c
new file mode 100644
index 0000000000..00f547d262
--- /dev/null
+++ b/drivers/gpio/gpio-idt3243x.c
@@ -0,0 +1,211 @@
+// 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);
+
+ gpiochip_disable_irq(gc, irqd_to_hwirq(d));
+}
+
+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;
+
+ gpiochip_enable_irq(gc, irqd_to_hwirq(d));
+ 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 const 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,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+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;
+ gpio_irq_chip_set_chip(girq, &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 <tsbogend@alpha.franken.de>");
+MODULE_LICENSE("GPL");