172edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek/* 272edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * arch/arm/plat-iop/gpio.c 372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * GPIO handling for Intel IOP3xx processors. 472edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * 572edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> 672edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * 772edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * This program is free software; you can redistribute it and/or modify 872edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * it under the terms of the GNU General Public License as published by 972edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * the Free Software Foundation; either version 2 of the License, or (at 1072edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek * your option) any later version. 1172edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek */ 1272edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 1372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek#include <linux/device.h> 1463f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard#include <linux/init.h> 1563f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard#include <linux/types.h> 1663f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard#include <linux/errno.h> 1763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard#include <linux/gpio.h> 18dc28094b905a872f8884f1f1c48ca86b3b78583aPaul Gortmaker#include <linux/export.h> 197b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#include <linux/platform_device.h> 20e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij#include <linux/bitops.h> 21e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij#include <linux/io.h> 22f6ffa5ee039cd0168d82e3edd712ebbb1de93a00Linus Walleij 23f6ffa5ee039cd0168d82e3edd712ebbb1de93a00Linus Walleij#define IOP3XX_N_GPIOS 8 2472edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 257b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#define GPIO_IN 0 267b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#define GPIO_OUT 1 277b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#define GPIO_LOW 0 287b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#define GPIO_HIGH 1 297b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 307b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij/* Memory base offset */ 317b85b867b99044da93f83851c806d1e324d49ed5Linus Walleijstatic void __iomem *base; 327b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 337b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij#define IOP3XX_GPIO_REG(reg) (base + (reg)) 34e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij#define IOP3XX_GPOE IOP3XX_GPIO_REG(0x0000) 35e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij#define IOP3XX_GPID IOP3XX_GPIO_REG(0x0004) 36e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij#define IOP3XX_GPOD IOP3XX_GPIO_REG(0x0008) 377b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 3851a97d829e32b7a1b960d3365e4c2546c9c792aaLinus Walleijstatic void gpio_line_config(int line, int direction) 3972edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek{ 4072edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek unsigned long flags; 41e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij u32 val; 4272edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 4372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek local_irq_save(flags); 44e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val = readl(IOP3XX_GPOE); 4572edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek if (direction == GPIO_IN) { 46e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val |= BIT(line); 4772edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek } else if (direction == GPIO_OUT) { 48e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val &= ~BIT(line); 4972edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek } 50e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij writel(val, IOP3XX_GPOE); 5172edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek local_irq_restore(flags); 5272edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek} 5372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 5451a97d829e32b7a1b960d3365e4c2546c9c792aaLinus Walleijstatic int gpio_line_get(int line) 5572edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek{ 56e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij return !!(readl(IOP3XX_GPID) & BIT(line)); 5772edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek} 5872edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 5951a97d829e32b7a1b960d3365e4c2546c9c792aaLinus Walleijstatic void gpio_line_set(int line, int value) 6072edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek{ 6172edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek unsigned long flags; 62e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij u32 val; 6372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek 6472edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek local_irq_save(flags); 65e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val = readl(IOP3XX_GPOD); 6672edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek if (value == GPIO_LOW) { 67e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val &= ~BIT(line); 6872edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek } else if (value == GPIO_HIGH) { 69e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij val |= BIT(line); 7072edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek } 71e3f94b385748c10b735f392b69f39f33f02ca3a5Linus Walleij writel(val, IOP3XX_GPOD); 7272edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek local_irq_restore(flags); 7372edd84a6b2db1a21d1ed07929cae560e276a0a6Lennert Buytenhek} 7463f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 7563f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patardstatic int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) 7663f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard{ 7763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard gpio_line_config(gpio, GPIO_IN); 7863f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard return 0; 7963f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard} 8063f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 8163f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patardstatic int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level) 8263f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard{ 8363f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard gpio_line_set(gpio, level); 8463f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard gpio_line_config(gpio, GPIO_OUT); 8563f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard return 0; 8663f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard} 8763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 8863f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patardstatic int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio) 8963f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard{ 9063f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard return gpio_line_get(gpio); 9163f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard} 9263f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 9363f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patardstatic void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) 9463f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard{ 9563f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard gpio_line_set(gpio, value); 9663f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard} 9763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 9863f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patardstatic struct gpio_chip iop3xx_chip = { 9963f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .label = "iop3xx", 10063f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .direction_input = iop3xx_gpio_direction_input, 10163f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .get = iop3xx_gpio_get_value, 10263f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .direction_output = iop3xx_gpio_direction_output, 10363f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .set = iop3xx_gpio_set_value, 10463f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .base = 0, 10563f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard .ngpio = IOP3XX_N_GPIOS, 10663f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard}; 10763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard 1087b85b867b99044da93f83851c806d1e324d49ed5Linus Walleijstatic int iop3xx_gpio_probe(struct platform_device *pdev) 10963f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard{ 1107b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij struct resource *res; 1117b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 1127b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 113e34ca9de0b3575fc7e94b1f520169fc7024c6dd2Linus Walleij base = devm_ioremap_resource(&pdev->dev, res); 114138d876e30353da34495e463d20c9bd7c0fd4ba0Bartlomiej Zolnierkiewicz if (IS_ERR(base)) 115138d876e30353da34495e463d20c9bd7c0fd4ba0Bartlomiej Zolnierkiewicz return PTR_ERR(base); 1167b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 11763f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard return gpiochip_add(&iop3xx_chip); 11863f385cd1f649b3f4f2d59fc609e051981215fd7Arnaud Patard} 1197b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 1207b85b867b99044da93f83851c806d1e324d49ed5Linus Walleijstatic struct platform_driver iop3xx_gpio_driver = { 1217b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij .driver = { 1227b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij .name = "gpio-iop", 1237b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij .owner = THIS_MODULE, 1247b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij }, 1257b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij .probe = iop3xx_gpio_probe, 1267b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij}; 1277b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij 1287b85b867b99044da93f83851c806d1e324d49ed5Linus Walleijstatic int __init iop3xx_gpio_init(void) 1297b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij{ 1307b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij return platform_driver_register(&iop3xx_gpio_driver); 1317b85b867b99044da93f83851c806d1e324d49ed5Linus Walleij} 1327b85b867b99044da93f83851c806d1e324d49ed5Linus Walleijarch_initcall(iop3xx_gpio_init); 133