1/* 2 * MOXA ART SoCs GPIO driver. 3 * 4 * Copyright (C) 2013 Jonas Jensen 5 * 6 * Jonas Jensen <jonas.jensen@gmail.com> 7 * 8 * This file is licensed under the terms of the GNU General Public 9 * License version 2. This program is licensed "as is" without any 10 * warranty of any kind, whether express or implied. 11 */ 12 13#include <linux/err.h> 14#include <linux/init.h> 15#include <linux/irq.h> 16#include <linux/io.h> 17#include <linux/gpio.h> 18#include <linux/platform_device.h> 19#include <linux/module.h> 20#include <linux/of_address.h> 21#include <linux/of_gpio.h> 22#include <linux/pinctrl/consumer.h> 23#include <linux/delay.h> 24#include <linux/timer.h> 25#include <linux/bitops.h> 26#include <linux/basic_mmio_gpio.h> 27 28#define GPIO_DATA_OUT 0x00 29#define GPIO_DATA_IN 0x04 30#define GPIO_PIN_DIRECTION 0x08 31 32static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset) 33{ 34 return pinctrl_request_gpio(offset); 35} 36 37static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset) 38{ 39 pinctrl_free_gpio(offset); 40} 41 42static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset) 43{ 44 struct bgpio_chip *bgc = to_bgpio_chip(chip); 45 u32 ret = bgc->read_reg(bgc->reg_dir); 46 47 if (ret & BIT(offset)) 48 return !!(bgc->read_reg(bgc->reg_set) & BIT(offset)); 49 else 50 return !!(bgc->read_reg(bgc->reg_dat) & BIT(offset)); 51} 52 53static int moxart_gpio_probe(struct platform_device *pdev) 54{ 55 struct device *dev = &pdev->dev; 56 struct resource *res; 57 struct bgpio_chip *bgc; 58 void __iomem *base; 59 int ret; 60 61 bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL); 62 if (!bgc) 63 return -ENOMEM; 64 65 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 66 base = devm_ioremap_resource(dev, res); 67 if (IS_ERR(base)) 68 return PTR_ERR(base); 69 70 ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN, 71 base + GPIO_DATA_OUT, NULL, 72 base + GPIO_PIN_DIRECTION, NULL, 0); 73 if (ret) { 74 dev_err(&pdev->dev, "bgpio_init failed\n"); 75 return ret; 76 } 77 78 bgc->gc.label = "moxart-gpio"; 79 bgc->gc.request = moxart_gpio_request; 80 bgc->gc.free = moxart_gpio_free; 81 bgc->gc.get = moxart_gpio_get; 82 bgc->data = bgc->read_reg(bgc->reg_set); 83 bgc->gc.base = 0; 84 bgc->gc.ngpio = 32; 85 bgc->gc.dev = dev; 86 bgc->gc.owner = THIS_MODULE; 87 88 ret = gpiochip_add(&bgc->gc); 89 if (ret) { 90 dev_err(dev, "%s: gpiochip_add failed\n", 91 dev->of_node->full_name); 92 return ret; 93 } 94 95 return ret; 96} 97 98static const struct of_device_id moxart_gpio_match[] = { 99 { .compatible = "moxa,moxart-gpio" }, 100 { } 101}; 102 103static struct platform_driver moxart_gpio_driver = { 104 .driver = { 105 .name = "moxart-gpio", 106 .of_match_table = moxart_gpio_match, 107 }, 108 .probe = moxart_gpio_probe, 109}; 110module_platform_driver(moxart_gpio_driver); 111 112MODULE_DESCRIPTION("MOXART GPIO chip driver"); 113MODULE_LICENSE("GPL"); 114MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); 115