--- /dev/null
+/*
+ * Ingenic JZ47xx GPIO driver
+ *
+ * Copyright (c) 2017 Paul Cercueil <paul@crapouillou.net>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regmap.h>
+
+#define GPIO_PIN 0x00
+#define GPIO_MSK 0x20
+
+#define JZ4740_GPIO_DATA 0x10
+#define JZ4740_GPIO_SELECT 0x50
+#define JZ4740_GPIO_DIR 0x60
+#define JZ4740_GPIO_TRIG 0x70
+#define JZ4740_GPIO_FLAG 0x80
+
+#define JZ4770_GPIO_INT 0x10
+#define JZ4770_GPIO_PAT1 0x30
+#define JZ4770_GPIO_PAT0 0x40
+#define JZ4770_GPIO_FLAG 0x50
+
+#define REG_SET(x) ((x) + 0x4)
+#define REG_CLEAR(x) ((x) + 0x8)
+
+enum jz_version {
+ ID_JZ4740,
+ ID_JZ4770,
+ ID_JZ4780,
+};
+
+struct ingenic_gpio_chip {
+ struct regmap *map;
+ struct gpio_chip gc;
+ struct irq_chip irq_chip;
+ unsigned int irq, reg_base;
+ enum jz_version version;
+};
+
+static u32 gpio_ingenic_read_reg(struct ingenic_gpio_chip *jzgc, u8 reg)
+{
+ unsigned int val;
+
+ regmap_read(jzgc->map, jzgc->reg_base + reg, &val);
+
+ return (u32) val;
+}
+
+static void gpio_ingenic_set_bit(struct ingenic_gpio_chip *jzgc,
+ u8 reg, u8 offset, bool set)
+{
+ if (set)
+ reg = REG_SET(reg);
+ else
+ reg = REG_CLEAR(reg);
+
+ regmap_write(jzgc->map, jzgc->reg_base + reg, BIT(offset));
+}
+
+static inline bool gpio_get_value(struct ingenic_gpio_chip *jzgc, u8 offset)
+{
+ unsigned int val = gpio_ingenic_read_reg(jzgc, GPIO_PIN);
+
+ return !!(val & BIT(offset));
+}
+
+static void gpio_set_value(struct ingenic_gpio_chip *jzgc, u8 offset, int value)
+{
+ if (jzgc->version >= ID_JZ4770)
+ gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_PAT0, offset, !!value);
+ else
+ gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_DATA, offset, !!value);
+}
+
+static void irq_set_type(struct ingenic_gpio_chip *jzgc,
+ u8 offset, unsigned int type)
+{
+ u8 reg1, reg2;
+
+ if (jzgc->version >= ID_JZ4770) {
+ reg1 = JZ4770_GPIO_PAT1;
+ reg2 = JZ4770_GPIO_PAT0;
+ } else {
+ reg1 = JZ4740_GPIO_TRIG;
+ reg2 = JZ4740_GPIO_DIR;
+ }
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ gpio_ingenic_set_bit(jzgc, reg2, offset, true);
+ gpio_ingenic_set_bit(jzgc, reg1, offset, true);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ gpio_ingenic_set_bit(jzgc, reg2, offset, false);
+ gpio_ingenic_set_bit(jzgc, reg1, offset, true);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ gpio_ingenic_set_bit(jzgc, reg2, offset, true);
+ gpio_ingenic_set_bit(jzgc, reg1, offset, false);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ default:
+ gpio_ingenic_set_bit(jzgc, reg2, offset, false);
+ gpio_ingenic_set_bit(jzgc, reg1, offset, false);
+ break;
+ }
+}
+
+static void ingenic_gpio_irq_mask(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ gpio_ingenic_set_bit(jzgc, GPIO_MSK, irqd->hwirq, true);
+}
+
+static void ingenic_gpio_irq_unmask(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ gpio_ingenic_set_bit(jzgc, GPIO_MSK, irqd->hwirq, false);
+}
+
+static void ingenic_gpio_irq_enable(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+ int irq = irqd->hwirq;
+
+ if (jzgc->version >= ID_JZ4770)
+ gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_INT, irq, true);
+ else
+ gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_SELECT, irq, true);
+
+ ingenic_gpio_irq_unmask(irqd);
+}
+
+static void ingenic_gpio_irq_disable(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+ int irq = irqd->hwirq;
+
+ ingenic_gpio_irq_mask(irqd);
+
+ if (jzgc->version >= ID_JZ4770)
+ gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_INT, irq, false);
+ else
+ gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_SELECT, irq, false);
+}
+
+static void ingenic_gpio_irq_ack(struct irq_data *irqd)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+ int irq = irqd->hwirq;
+ bool high;
+
+ if (irqd_get_trigger_type(irqd) == IRQ_TYPE_EDGE_BOTH) {
+ /*
+ * Switch to an interrupt for the opposite edge to the one that
+ * triggered the interrupt being ACKed.
+ */
+ high = gpio_get_value(jzgc, irq);
+ if (high)
+ irq_set_type(jzgc, irq, IRQ_TYPE_EDGE_FALLING);
+ else
+ irq_set_type(jzgc, irq, IRQ_TYPE_EDGE_RISING);
+ }
+
+ if (jzgc->version >= ID_JZ4770)
+ gpio_ingenic_set_bit(jzgc, JZ4770_GPIO_FLAG, irq, false);
+ else
+ gpio_ingenic_set_bit(jzgc, JZ4740_GPIO_DATA, irq, true);
+}
+
+static int ingenic_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_set_handler_locked(irqd, handle_edge_irq);
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_set_handler_locked(irqd, handle_level_irq);
+ break;
+ default:
+ irq_set_handler_locked(irqd, handle_bad_irq);
+ }
+
+ if (type == IRQ_TYPE_EDGE_BOTH) {
+ /*
+ * The hardware does not support interrupts on both edges. The
+ * best we can do is to set up a single-edge interrupt and then
+ * switch to the opposing edge when ACKing the interrupt.
+ */
+ bool high = gpio_get_value(jzgc, irqd->hwirq);
+
+ type = high ? IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
+ }
+
+ irq_set_type(jzgc, irqd->hwirq, type);
+ return 0;
+}
+
+static int ingenic_gpio_irq_set_wake(struct irq_data *irqd, unsigned int on)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ return irq_set_irq_wake(jzgc->irq, on);
+}
+
+static void ingenic_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+ struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
+ unsigned long flag, i;
+
+ chained_irq_enter(irq_chip, desc);
+
+ if (jzgc->version >= ID_JZ4770)
+ flag = gpio_ingenic_read_reg(jzgc, JZ4770_GPIO_FLAG);
+ else
+ flag = gpio_ingenic_read_reg(jzgc, JZ4740_GPIO_FLAG);
+
+ for_each_set_bit(i, &flag, 32)
+ generic_handle_irq(irq_linear_revmap(gc->irqdomain, i));
+ chained_irq_exit(irq_chip, desc);
+}
+
+static void ingenic_gpio_set(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ gpio_set_value(jzgc, offset, value);
+}
+
+static int ingenic_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
+
+ return (int) gpio_get_value(jzgc, offset);
+}
+
+static int ingenic_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ return pinctrl_gpio_direction_input(gc->base + offset);
+}
+
+static int ingenic_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ ingenic_gpio_set(gc, offset, value);
+ return pinctrl_gpio_direction_output(gc->base + offset);
+}
+
+static const struct of_device_id ingenic_gpio_of_match[] = {
+ { .compatible = "ingenic,jz4740-gpio", .data = (void *)ID_JZ4740 },
+ { .compatible = "ingenic,jz4770-gpio", .data = (void *)ID_JZ4770 },
+ { .compatible = "ingenic,jz4780-gpio", .data = (void *)ID_JZ4780 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ingenic_gpio_of_match);
+
+static int ingenic_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id = of_match_device(
+ ingenic_gpio_of_match, dev);
+ struct ingenic_gpio_chip *jzgc;
+ u32 bank;
+ int err;
+
+ jzgc = devm_kzalloc(dev, sizeof(*jzgc), GFP_KERNEL);
+ if (!jzgc)
+ return -ENOMEM;
+
+ jzgc->map = dev_get_drvdata(dev->parent);
+ if (!jzgc->map) {
+ dev_err(dev, "Cannot get parent regmap\n");
+ return -ENXIO;
+ }
+
+ err = of_property_read_u32(dev->of_node, "reg", &bank);
+ if (err) {
+ dev_err(dev, "Cannot read \"reg\" property: %i\n", err);
+ return err;
+ }
+
+ jzgc->reg_base = bank * 0x100;
+
+ jzgc->gc.label = devm_kasprintf(dev, GFP_KERNEL, "GPIO%c", 'A' + bank);
+ if (!jzgc->gc.label)
+ return -ENOMEM;
+
+ /* DO NOT EXPAND THIS: FOR BACKWARD GPIO NUMBERSPACE COMPATIBIBILITY
+ * ONLY: WORK TO TRANSITION CONSUMERS TO USE THE GPIO DESCRIPTOR API IN
+ * <linux/gpio/consumer.h> INSTEAD.
+ */
+ jzgc->gc.base = bank * 32;
+
+ jzgc->gc.ngpio = 32;
+ jzgc->gc.parent = dev;
+ jzgc->gc.of_node = dev->of_node;
+ jzgc->gc.owner = THIS_MODULE;
+ jzgc->version = (enum jz_version)of_id->data;
+
+ jzgc->gc.set = ingenic_gpio_set;
+ jzgc->gc.get = ingenic_gpio_get;
+ jzgc->gc.direction_input = ingenic_gpio_direction_input;
+ jzgc->gc.direction_output = ingenic_gpio_direction_output;
+
+ if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
+ jzgc->gc.request = gpiochip_generic_request;
+ jzgc->gc.free = gpiochip_generic_free;
+ }
+
+ err = devm_gpiochip_add_data(dev, &jzgc->gc, jzgc);
+ if (err)
+ return err;
+
+ jzgc->irq = irq_of_parse_and_map(dev->of_node, 0);
+ if (!jzgc->irq)
+ return -EINVAL;
+
+ jzgc->irq_chip.name = jzgc->gc.label;
+ jzgc->irq_chip.irq_enable = ingenic_gpio_irq_enable;
+ jzgc->irq_chip.irq_disable = ingenic_gpio_irq_disable;
+ jzgc->irq_chip.irq_unmask = ingenic_gpio_irq_unmask;
+ jzgc->irq_chip.irq_mask = ingenic_gpio_irq_mask;
+ jzgc->irq_chip.irq_ack = ingenic_gpio_irq_ack;
+ jzgc->irq_chip.irq_set_type = ingenic_gpio_irq_set_type;
+ jzgc->irq_chip.irq_set_wake = ingenic_gpio_irq_set_wake;
+ jzgc->irq_chip.flags = IRQCHIP_MASK_ON_SUSPEND;
+
+ err = gpiochip_irqchip_add(&jzgc->gc, &jzgc->irq_chip, 0,
+ handle_level_irq, IRQ_TYPE_NONE);
+ if (err)
+ return err;
+
+ gpiochip_set_chained_irqchip(&jzgc->gc, &jzgc->irq_chip,
+ jzgc->irq, ingenic_gpio_irq_handler);
+ return 0;
+}
+
+static int ingenic_gpio_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver ingenic_gpio_driver = {
+ .driver = {
+ .name = "gpio-ingenic",
+ .of_match_table = of_match_ptr(ingenic_gpio_of_match),
+ },
+ .probe = ingenic_gpio_probe,
+ .remove = ingenic_gpio_remove,
+};
+
+static int __init ingenic_gpio_drv_register(void)
+{
+ return platform_driver_register(&ingenic_gpio_driver);
+}
+subsys_initcall(ingenic_gpio_drv_register);
+
+static void __exit ingenic_gpio_drv_unregister(void)
+{
+ platform_driver_unregister(&ingenic_gpio_driver);
+}
+module_exit(ingenic_gpio_drv_unregister);
+
+MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
+MODULE_DESCRIPTION("Ingenic JZ47xx GPIO driver");
+MODULE_LICENSE("GPL");
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