--- /dev/null
+/*
+ * Renesas R-Car GPIO Support
+ *
+ * Copyright (C) 2013 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/platform_data/gpio-rcar.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+struct gpio_rcar_priv {
+ void __iomem *base;
+ spinlock_t lock;
+ struct gpio_rcar_config config;
+ struct platform_device *pdev;
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+ struct irq_domain *irq_domain;
+};
+
+#define IOINTSEL 0x00
+#define INOUTSEL 0x04
+#define OUTDT 0x08
+#define INDT 0x0c
+#define INTDT 0x10
+#define INTCLR 0x14
+#define INTMSK 0x18
+#define MSKCLR 0x1c
+#define POSNEG 0x20
+#define EDGLEVEL 0x24
+#define FILONOFF 0x28
+
+static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
+{
+ return ioread32(p->base + offs);
+}
+
+static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
+ u32 value)
+{
+ iowrite32(value, p->base + offs);
+}
+
+static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
+ int bit, bool value)
+{
+ u32 tmp = gpio_rcar_read(p, offs);
+
+ if (value)
+ tmp |= BIT(bit);
+ else
+ tmp &= ~BIT(bit);
+
+ gpio_rcar_write(p, offs, tmp);
+}
+
+static void gpio_rcar_irq_disable(struct irq_data *d)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+
+ gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
+}
+
+static void gpio_rcar_irq_enable(struct irq_data *d)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+
+ gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
+}
+
+static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
+ unsigned int hwirq,
+ bool active_high_rising_edge,
+ bool level_trigger)
+{
+ unsigned long flags;
+
+ /* follow steps in the GPIO documentation for
+ * "Setting Edge-Sensitive Interrupt Input Mode" and
+ * "Setting Level-Sensitive Interrupt Input Mode"
+ */
+
+ spin_lock_irqsave(&p->lock, flags);
+
+ /* Configure postive or negative logic in POSNEG */
+ gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);
+
+ /* Configure edge or level trigger in EDGLEVEL */
+ gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);
+
+ /* Select "Interrupt Input Mode" in IOINTSEL */
+ gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);
+
+ /* Write INTCLR in case of edge trigger */
+ if (!level_trigger)
+ gpio_rcar_write(p, INTCLR, BIT(hwirq));
+
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+ unsigned int hwirq = irqd_to_hwirq(d);
+
+ dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type);
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
+{
+ struct gpio_rcar_priv *p = dev_id;
+ u32 pending;
+ unsigned int offset, irqs_handled = 0;
+
+ while ((pending = gpio_rcar_read(p, INTDT))) {
+ offset = __ffs(pending);
+ gpio_rcar_write(p, INTCLR, BIT(offset));
+ generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
+ irqs_handled++;
+ }
+
+ return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline struct gpio_rcar_priv *gpio_to_priv(struct gpio_chip *chip)
+{
+ return container_of(chip, struct gpio_rcar_priv, gpio_chip);
+}
+
+static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
+ unsigned int gpio,
+ bool output)
+{
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+ unsigned long flags;
+
+ /* follow steps in the GPIO documentation for
+ * "Setting General Output Mode" and
+ * "Setting General Input Mode"
+ */
+
+ spin_lock_irqsave(&p->lock, flags);
+
+ /* Configure postive logic in POSNEG */
+ gpio_rcar_modify_bit(p, POSNEG, gpio, false);
+
+ /* Select "General Input/Output Mode" in IOINTSEL */
+ gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);
+
+ /* Select Input Mode or Output Mode in INOUTSEL */
+ gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);
+
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ gpio_rcar_config_general_input_output_mode(chip, offset, false);
+ return 0;
+}
+
+static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
+{
+ return (int)(gpio_rcar_read(gpio_to_priv(chip), INDT) & BIT(offset));
+}
+
+static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+ unsigned long flags;
+
+ spin_lock_irqsave(&p->lock, flags);
+ gpio_rcar_modify_bit(p, OUTDT, offset, value);
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ /* write GPIO value to output before selecting output mode of pin */
+ gpio_rcar_set(chip, offset, value);
+ gpio_rcar_config_general_input_output_mode(chip, offset, true);
+ return 0;
+}
+
+static int gpio_rcar_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
+}
+
+static int gpio_rcar_irq_domain_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct gpio_rcar_priv *p = h->host_data;
+
+ dev_dbg(&p->pdev->dev, "map hw irq = %d, virq = %d\n", (int)hw, virq);
+
+ irq_set_chip_data(virq, h->host_data);
+ irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
+ set_irq_flags(virq, IRQF_VALID); /* kill me now */
+ return 0;
+}
+
+static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
+ .map = gpio_rcar_irq_domain_map,
+};
+
+static int gpio_rcar_probe(struct platform_device *pdev)
+{
+ struct gpio_rcar_config *pdata = pdev->dev.platform_data;
+ struct gpio_rcar_priv *p;
+ struct resource *io, *irq;
+ struct gpio_chip *gpio_chip;
+ struct irq_chip *irq_chip;
+ const char *name = dev_name(&pdev->dev);
+ int ret;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p) {
+ dev_err(&pdev->dev, "failed to allocate driver data\n");
+ ret = -ENOMEM;
+ goto err0;
+ }
+
+ /* deal with driver instance configuration */
+ if (pdata)
+ p->config = *pdata;
+
+ p->pdev = pdev;
+ platform_set_drvdata(pdev, p);
+ spin_lock_init(&p->lock);
+
+ io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+
+ if (!io || !irq) {
+ dev_err(&pdev->dev, "missing IRQ or IOMEM\n");
+ ret = -EINVAL;
+ goto err0;
+ }
+
+ p->base = devm_ioremap_nocache(&pdev->dev, io->start,
+ resource_size(io));
+ if (!p->base) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ ret = -ENXIO;
+ goto err0;
+ }
+
+ gpio_chip = &p->gpio_chip;
+ gpio_chip->direction_input = gpio_rcar_direction_input;
+ gpio_chip->get = gpio_rcar_get;
+ gpio_chip->direction_output = gpio_rcar_direction_output;
+ gpio_chip->set = gpio_rcar_set;
+ gpio_chip->to_irq = gpio_rcar_to_irq;
+ gpio_chip->label = name;
+ gpio_chip->owner = THIS_MODULE;
+ gpio_chip->base = p->config.gpio_base;
+ gpio_chip->ngpio = p->config.number_of_pins;
+
+ irq_chip = &p->irq_chip;
+ irq_chip->name = name;
+ irq_chip->irq_mask = gpio_rcar_irq_disable;
+ irq_chip->irq_unmask = gpio_rcar_irq_enable;
+ irq_chip->irq_enable = gpio_rcar_irq_enable;
+ irq_chip->irq_disable = gpio_rcar_irq_disable;
+ irq_chip->irq_set_type = gpio_rcar_irq_set_type;
+ irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED;
+
+ p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
+ p->config.number_of_pins,
+ p->config.irq_base,
+ &gpio_rcar_irq_domain_ops, p);
+ if (!p->irq_domain) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "cannot initialize irq domain\n");
+ goto err1;
+ }
+
+ if (devm_request_irq(&pdev->dev, irq->start,
+ gpio_rcar_irq_handler, 0, name, p)) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ ret = -ENOENT;
+ goto err1;
+ }
+
+ ret = gpiochip_add(gpio_chip);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add GPIO controller\n");
+ goto err1;
+ }
+
+ dev_info(&pdev->dev, "driving %d GPIOs\n", p->config.number_of_pins);
+
+ /* warn in case of mismatch if irq base is specified */
+ if (p->config.irq_base) {
+ ret = irq_find_mapping(p->irq_domain, 0);
+ if (p->config.irq_base != ret)
+ dev_warn(&pdev->dev, "irq base mismatch (%u/%u)\n",
+ p->config.irq_base, ret);
+ }
+
+ return 0;
+
+err1:
+ irq_domain_remove(p->irq_domain);
+err0:
+ return ret;
+}
+
+static int gpio_rcar_remove(struct platform_device *pdev)
+{
+ struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(&p->gpio_chip);
+ if (ret)
+ return ret;
+
+ irq_domain_remove(p->irq_domain);
+ return 0;
+}
+
+static struct platform_driver gpio_rcar_device_driver = {
+ .probe = gpio_rcar_probe,
+ .remove = gpio_rcar_remove,
+ .driver = {
+ .name = "gpio_rcar",
+ }
+};
+
+module_platform_driver(gpio_rcar_device_driver);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
+MODULE_LICENSE("GPL v2");
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