| /* |
| * vf610 GPIO support through PORT and GPIO module |
| * |
| * Copyright (c) 2014 Toradex AG. |
| * |
| * Author: Stefan Agner <stefan@agner.ch>. |
| * |
| * 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, or (at your option) any later version. |
| * 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/bitops.h> |
| #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/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_irq.h> |
| |
| #define VF610_GPIO_PER_PORT 32 |
| |
| struct vf610_gpio_port { |
| struct gpio_chip gc; |
| void __iomem *base; |
| void __iomem *gpio_base; |
| u8 irqc[VF610_GPIO_PER_PORT]; |
| int irq; |
| }; |
| |
| #define GPIO_PDOR 0x00 |
| #define GPIO_PSOR 0x04 |
| #define GPIO_PCOR 0x08 |
| #define GPIO_PTOR 0x0c |
| #define GPIO_PDIR 0x10 |
| |
| #define PORT_PCR(n) ((n) * 0x4) |
| #define PORT_PCR_IRQC_OFFSET 16 |
| |
| #define PORT_ISFR 0xa0 |
| #define PORT_DFER 0xc0 |
| #define PORT_DFCR 0xc4 |
| #define PORT_DFWR 0xc8 |
| |
| #define PORT_INT_OFF 0x0 |
| #define PORT_INT_LOGIC_ZERO 0x8 |
| #define PORT_INT_RISING_EDGE 0x9 |
| #define PORT_INT_FALLING_EDGE 0xa |
| #define PORT_INT_EITHER_EDGE 0xb |
| #define PORT_INT_LOGIC_ONE 0xc |
| |
| static const struct of_device_id vf610_gpio_dt_ids[] = { |
| { .compatible = "fsl,vf610-gpio" }, |
| { /* sentinel */ } |
| }; |
| |
| static inline void vf610_gpio_writel(u32 val, void __iomem *reg) |
| { |
| writel_relaxed(val, reg); |
| } |
| |
| static inline u32 vf610_gpio_readl(void __iomem *reg) |
| { |
| return readl_relaxed(reg); |
| } |
| |
| static int vf610_gpio_request(struct gpio_chip *chip, unsigned offset) |
| { |
| return pinctrl_request_gpio(chip->base + offset); |
| } |
| |
| static void vf610_gpio_free(struct gpio_chip *chip, unsigned offset) |
| { |
| pinctrl_free_gpio(chip->base + offset); |
| } |
| |
| static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio) |
| { |
| struct vf610_gpio_port *port = |
| container_of(gc, struct vf610_gpio_port, gc); |
| |
| return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR) & BIT(gpio)); |
| } |
| |
| static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| { |
| struct vf610_gpio_port *port = |
| container_of(gc, struct vf610_gpio_port, gc); |
| unsigned long mask = BIT(gpio); |
| |
| if (val) |
| vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR); |
| else |
| vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR); |
| } |
| |
| static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| { |
| return pinctrl_gpio_direction_input(chip->base + gpio); |
| } |
| |
| static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, |
| int value) |
| { |
| vf610_gpio_set(chip, gpio, value); |
| |
| return pinctrl_gpio_direction_output(chip->base + gpio); |
| } |
| |
| static void vf610_gpio_irq_handler(u32 irq, struct irq_desc *desc) |
| { |
| struct vf610_gpio_port *port = irq_desc_get_handler_data(desc); |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| int pin; |
| unsigned long irq_isfr; |
| |
| chained_irq_enter(chip, desc); |
| |
| irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR); |
| |
| for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) { |
| vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR); |
| |
| generic_handle_irq(irq_find_mapping(port->gc.irqdomain, pin)); |
| } |
| |
| chained_irq_exit(chip, desc); |
| } |
| |
| static void vf610_gpio_irq_ack(struct irq_data *d) |
| { |
| struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d); |
| int gpio = d->hwirq; |
| |
| vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR); |
| } |
| |
| static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type) |
| { |
| struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d); |
| u8 irqc; |
| |
| switch (type) { |
| case IRQ_TYPE_EDGE_RISING: |
| irqc = PORT_INT_RISING_EDGE; |
| break; |
| case IRQ_TYPE_EDGE_FALLING: |
| irqc = PORT_INT_FALLING_EDGE; |
| break; |
| case IRQ_TYPE_EDGE_BOTH: |
| irqc = PORT_INT_EITHER_EDGE; |
| break; |
| case IRQ_TYPE_LEVEL_LOW: |
| irqc = PORT_INT_LOGIC_ZERO; |
| break; |
| case IRQ_TYPE_LEVEL_HIGH: |
| irqc = PORT_INT_LOGIC_ONE; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| port->irqc[d->hwirq] = irqc; |
| |
| return 0; |
| } |
| |
| static void vf610_gpio_irq_mask(struct irq_data *d) |
| { |
| struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d); |
| void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq); |
| |
| vf610_gpio_writel(0, pcr_base); |
| } |
| |
| static void vf610_gpio_irq_unmask(struct irq_data *d) |
| { |
| struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d); |
| void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq); |
| |
| vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET, |
| pcr_base); |
| } |
| |
| static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable) |
| { |
| struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d); |
| |
| if (enable) |
| enable_irq_wake(port->irq); |
| else |
| disable_irq_wake(port->irq); |
| |
| return 0; |
| } |
| |
| static struct irq_chip vf610_gpio_irq_chip = { |
| .name = "gpio-vf610", |
| .irq_ack = vf610_gpio_irq_ack, |
| .irq_mask = vf610_gpio_irq_mask, |
| .irq_unmask = vf610_gpio_irq_unmask, |
| .irq_set_type = vf610_gpio_irq_set_type, |
| .irq_set_wake = vf610_gpio_irq_set_wake, |
| }; |
| |
| static int vf610_gpio_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *np = dev->of_node; |
| struct vf610_gpio_port *port; |
| struct resource *iores; |
| struct gpio_chip *gc; |
| int ret; |
| |
| port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL); |
| if (!port) |
| return -ENOMEM; |
| |
| iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| port->base = devm_ioremap_resource(dev, iores); |
| if (IS_ERR(port->base)) |
| return PTR_ERR(port->base); |
| |
| iores = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| port->gpio_base = devm_ioremap_resource(dev, iores); |
| if (IS_ERR(port->gpio_base)) |
| return PTR_ERR(port->gpio_base); |
| |
| port->irq = platform_get_irq(pdev, 0); |
| if (port->irq < 0) |
| return port->irq; |
| |
| gc = &port->gc; |
| gc->of_node = np; |
| gc->dev = dev; |
| gc->label = "vf610-gpio"; |
| gc->ngpio = VF610_GPIO_PER_PORT; |
| gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT; |
| |
| gc->request = vf610_gpio_request; |
| gc->free = vf610_gpio_free; |
| gc->direction_input = vf610_gpio_direction_input; |
| gc->get = vf610_gpio_get; |
| gc->direction_output = vf610_gpio_direction_output; |
| gc->set = vf610_gpio_set; |
| |
| ret = gpiochip_add(gc); |
| if (ret < 0) |
| return ret; |
| |
| /* Clear the interrupt status register for all GPIO's */ |
| vf610_gpio_writel(~0, port->base + PORT_ISFR); |
| |
| ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0, |
| handle_simple_irq, IRQ_TYPE_NONE); |
| if (ret) { |
| dev_err(dev, "failed to add irqchip\n"); |
| gpiochip_remove(gc); |
| return ret; |
| } |
| gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq, |
| vf610_gpio_irq_handler); |
| |
| return 0; |
| } |
| |
| static struct platform_driver vf610_gpio_driver = { |
| .driver = { |
| .name = "gpio-vf610", |
| .of_match_table = vf610_gpio_dt_ids, |
| }, |
| .probe = vf610_gpio_probe, |
| }; |
| |
| static int __init gpio_vf610_init(void) |
| { |
| return platform_driver_register(&vf610_gpio_driver); |
| } |
| device_initcall(gpio_vf610_init); |
| |
| MODULE_AUTHOR("Stefan Agner <stefan@agner.ch>"); |
| MODULE_DESCRIPTION("Freescale VF610 GPIO"); |
| MODULE_LICENSE("GPL v2"); |