16a8a0c1dSAlexander Shiyan /* 26a8a0c1dSAlexander Shiyan * SYSCON GPIO driver 36a8a0c1dSAlexander Shiyan * 46a8a0c1dSAlexander Shiyan * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> 56a8a0c1dSAlexander Shiyan * 66a8a0c1dSAlexander Shiyan * This program is free software; you can redistribute it and/or modify 76a8a0c1dSAlexander Shiyan * it under the terms of the GNU General Public License as published by 86a8a0c1dSAlexander Shiyan * the Free Software Foundation; either version 2 of the License, or 96a8a0c1dSAlexander Shiyan * (at your option) any later version. 106a8a0c1dSAlexander Shiyan */ 116a8a0c1dSAlexander Shiyan 126a8a0c1dSAlexander Shiyan #include <linux/err.h> 136a8a0c1dSAlexander Shiyan #include <linux/gpio.h> 146a8a0c1dSAlexander Shiyan #include <linux/module.h> 156a8a0c1dSAlexander Shiyan #include <linux/of.h> 166a8a0c1dSAlexander Shiyan #include <linux/of_device.h> 176a8a0c1dSAlexander Shiyan #include <linux/platform_device.h> 186a8a0c1dSAlexander Shiyan #include <linux/regmap.h> 196a8a0c1dSAlexander Shiyan #include <linux/mfd/syscon.h> 206a8a0c1dSAlexander Shiyan 216a8a0c1dSAlexander Shiyan #define GPIO_SYSCON_FEAT_IN BIT(0) 226a8a0c1dSAlexander Shiyan #define GPIO_SYSCON_FEAT_OUT BIT(1) 236a8a0c1dSAlexander Shiyan #define GPIO_SYSCON_FEAT_DIR BIT(2) 246a8a0c1dSAlexander Shiyan 256a8a0c1dSAlexander Shiyan /* SYSCON driver is designed to use 32-bit wide registers */ 266a8a0c1dSAlexander Shiyan #define SYSCON_REG_SIZE (4) 276a8a0c1dSAlexander Shiyan #define SYSCON_REG_BITS (SYSCON_REG_SIZE * 8) 286a8a0c1dSAlexander Shiyan 296a8a0c1dSAlexander Shiyan /** 306a8a0c1dSAlexander Shiyan * struct syscon_gpio_data - Configuration for the device. 316a8a0c1dSAlexander Shiyan * compatible: SYSCON driver compatible string. 326a8a0c1dSAlexander Shiyan * flags: Set of GPIO_SYSCON_FEAT_ flags: 336a8a0c1dSAlexander Shiyan * GPIO_SYSCON_FEAT_IN: GPIOs supports input, 346a8a0c1dSAlexander Shiyan * GPIO_SYSCON_FEAT_OUT: GPIOs supports output, 356a8a0c1dSAlexander Shiyan * GPIO_SYSCON_FEAT_DIR: GPIOs supports switch direction. 366a8a0c1dSAlexander Shiyan * bit_count: Number of bits used as GPIOs. 376a8a0c1dSAlexander Shiyan * dat_bit_offset: Offset (in bits) to the first GPIO bit. 386a8a0c1dSAlexander Shiyan * dir_bit_offset: Optional offset (in bits) to the first bit to switch 396a8a0c1dSAlexander Shiyan * GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag). 402c341d62SGrygorii Strashko * set: HW specific callback to assigns output value 412c341d62SGrygorii Strashko * for signal "offset" 426a8a0c1dSAlexander Shiyan */ 436a8a0c1dSAlexander Shiyan 446a8a0c1dSAlexander Shiyan struct syscon_gpio_data { 456a8a0c1dSAlexander Shiyan const char *compatible; 466a8a0c1dSAlexander Shiyan unsigned int flags; 476a8a0c1dSAlexander Shiyan unsigned int bit_count; 486a8a0c1dSAlexander Shiyan unsigned int dat_bit_offset; 496a8a0c1dSAlexander Shiyan unsigned int dir_bit_offset; 502c341d62SGrygorii Strashko void (*set)(struct gpio_chip *chip, 512c341d62SGrygorii Strashko unsigned offset, int value); 526a8a0c1dSAlexander Shiyan }; 536a8a0c1dSAlexander Shiyan 546a8a0c1dSAlexander Shiyan struct syscon_gpio_priv { 556a8a0c1dSAlexander Shiyan struct gpio_chip chip; 566a8a0c1dSAlexander Shiyan struct regmap *syscon; 576a8a0c1dSAlexander Shiyan const struct syscon_gpio_data *data; 586a8a0c1dSAlexander Shiyan }; 596a8a0c1dSAlexander Shiyan 606a8a0c1dSAlexander Shiyan static inline struct syscon_gpio_priv *to_syscon_gpio(struct gpio_chip *chip) 616a8a0c1dSAlexander Shiyan { 626a8a0c1dSAlexander Shiyan return container_of(chip, struct syscon_gpio_priv, chip); 636a8a0c1dSAlexander Shiyan } 646a8a0c1dSAlexander Shiyan 656a8a0c1dSAlexander Shiyan static int syscon_gpio_get(struct gpio_chip *chip, unsigned offset) 666a8a0c1dSAlexander Shiyan { 676a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv = to_syscon_gpio(chip); 686a8a0c1dSAlexander Shiyan unsigned int val, offs = priv->data->dat_bit_offset + offset; 696a8a0c1dSAlexander Shiyan int ret; 706a8a0c1dSAlexander Shiyan 716a8a0c1dSAlexander Shiyan ret = regmap_read(priv->syscon, 726a8a0c1dSAlexander Shiyan (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, &val); 736a8a0c1dSAlexander Shiyan if (ret) 746a8a0c1dSAlexander Shiyan return ret; 756a8a0c1dSAlexander Shiyan 766a8a0c1dSAlexander Shiyan return !!(val & BIT(offs % SYSCON_REG_BITS)); 776a8a0c1dSAlexander Shiyan } 786a8a0c1dSAlexander Shiyan 796a8a0c1dSAlexander Shiyan static void syscon_gpio_set(struct gpio_chip *chip, unsigned offset, int val) 806a8a0c1dSAlexander Shiyan { 816a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv = to_syscon_gpio(chip); 826a8a0c1dSAlexander Shiyan unsigned int offs = priv->data->dat_bit_offset + offset; 836a8a0c1dSAlexander Shiyan 846a8a0c1dSAlexander Shiyan regmap_update_bits(priv->syscon, 856a8a0c1dSAlexander Shiyan (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, 866a8a0c1dSAlexander Shiyan BIT(offs % SYSCON_REG_BITS), 876a8a0c1dSAlexander Shiyan val ? BIT(offs % SYSCON_REG_BITS) : 0); 886a8a0c1dSAlexander Shiyan } 896a8a0c1dSAlexander Shiyan 906a8a0c1dSAlexander Shiyan static int syscon_gpio_dir_in(struct gpio_chip *chip, unsigned offset) 916a8a0c1dSAlexander Shiyan { 926a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv = to_syscon_gpio(chip); 936a8a0c1dSAlexander Shiyan 946a8a0c1dSAlexander Shiyan if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) { 956a8a0c1dSAlexander Shiyan unsigned int offs = priv->data->dir_bit_offset + offset; 966a8a0c1dSAlexander Shiyan 976a8a0c1dSAlexander Shiyan regmap_update_bits(priv->syscon, 986a8a0c1dSAlexander Shiyan (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, 996a8a0c1dSAlexander Shiyan BIT(offs % SYSCON_REG_BITS), 0); 1006a8a0c1dSAlexander Shiyan } 1016a8a0c1dSAlexander Shiyan 1026a8a0c1dSAlexander Shiyan return 0; 1036a8a0c1dSAlexander Shiyan } 1046a8a0c1dSAlexander Shiyan 1056a8a0c1dSAlexander Shiyan static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val) 1066a8a0c1dSAlexander Shiyan { 1076a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv = to_syscon_gpio(chip); 1086a8a0c1dSAlexander Shiyan 1096a8a0c1dSAlexander Shiyan if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) { 1106a8a0c1dSAlexander Shiyan unsigned int offs = priv->data->dir_bit_offset + offset; 1116a8a0c1dSAlexander Shiyan 1126a8a0c1dSAlexander Shiyan regmap_update_bits(priv->syscon, 1136a8a0c1dSAlexander Shiyan (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, 1146a8a0c1dSAlexander Shiyan BIT(offs % SYSCON_REG_BITS), 1156a8a0c1dSAlexander Shiyan BIT(offs % SYSCON_REG_BITS)); 1166a8a0c1dSAlexander Shiyan } 1176a8a0c1dSAlexander Shiyan 1182c341d62SGrygorii Strashko priv->data->set(chip, offset, val); 1196a8a0c1dSAlexander Shiyan 1206a8a0c1dSAlexander Shiyan return 0; 1216a8a0c1dSAlexander Shiyan } 1226a8a0c1dSAlexander Shiyan 1236a8a0c1dSAlexander Shiyan static const struct syscon_gpio_data clps711x_mctrl_gpio = { 1246a8a0c1dSAlexander Shiyan /* ARM CLPS711X SYSFLG1 Bits 8-10 */ 1256a8a0c1dSAlexander Shiyan .compatible = "cirrus,clps711x-syscon1", 1266a8a0c1dSAlexander Shiyan .flags = GPIO_SYSCON_FEAT_IN, 1276a8a0c1dSAlexander Shiyan .bit_count = 3, 1286a8a0c1dSAlexander Shiyan .dat_bit_offset = 0x40 * 8 + 8, 1296a8a0c1dSAlexander Shiyan }; 1306a8a0c1dSAlexander Shiyan 1316a8a0c1dSAlexander Shiyan static const struct of_device_id syscon_gpio_ids[] = { 1326a8a0c1dSAlexander Shiyan { 1336a8a0c1dSAlexander Shiyan .compatible = "cirrus,clps711x-mctrl-gpio", 1346a8a0c1dSAlexander Shiyan .data = &clps711x_mctrl_gpio, 1356a8a0c1dSAlexander Shiyan }, 1366a8a0c1dSAlexander Shiyan { } 1376a8a0c1dSAlexander Shiyan }; 1386a8a0c1dSAlexander Shiyan MODULE_DEVICE_TABLE(of, syscon_gpio_ids); 1396a8a0c1dSAlexander Shiyan 1406a8a0c1dSAlexander Shiyan static int syscon_gpio_probe(struct platform_device *pdev) 1416a8a0c1dSAlexander Shiyan { 1426a8a0c1dSAlexander Shiyan struct device *dev = &pdev->dev; 1436a8a0c1dSAlexander Shiyan const struct of_device_id *of_id = of_match_device(syscon_gpio_ids, dev); 1446a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv; 1456a8a0c1dSAlexander Shiyan 1466a8a0c1dSAlexander Shiyan priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 1476a8a0c1dSAlexander Shiyan if (!priv) 1486a8a0c1dSAlexander Shiyan return -ENOMEM; 1496a8a0c1dSAlexander Shiyan 1506a8a0c1dSAlexander Shiyan priv->data = of_id->data; 1516a8a0c1dSAlexander Shiyan 1526a8a0c1dSAlexander Shiyan priv->syscon = 1536a8a0c1dSAlexander Shiyan syscon_regmap_lookup_by_compatible(priv->data->compatible); 1546a8a0c1dSAlexander Shiyan if (IS_ERR(priv->syscon)) 1556a8a0c1dSAlexander Shiyan return PTR_ERR(priv->syscon); 1566a8a0c1dSAlexander Shiyan 1576a8a0c1dSAlexander Shiyan priv->chip.dev = dev; 1586a8a0c1dSAlexander Shiyan priv->chip.owner = THIS_MODULE; 1596a8a0c1dSAlexander Shiyan priv->chip.label = dev_name(dev); 1606a8a0c1dSAlexander Shiyan priv->chip.base = -1; 1616a8a0c1dSAlexander Shiyan priv->chip.ngpio = priv->data->bit_count; 1626a8a0c1dSAlexander Shiyan priv->chip.get = syscon_gpio_get; 1636a8a0c1dSAlexander Shiyan if (priv->data->flags & GPIO_SYSCON_FEAT_IN) 1646a8a0c1dSAlexander Shiyan priv->chip.direction_input = syscon_gpio_dir_in; 1656a8a0c1dSAlexander Shiyan if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) { 1662c341d62SGrygorii Strashko priv->chip.set = priv->data->set ? : syscon_gpio_set; 1676a8a0c1dSAlexander Shiyan priv->chip.direction_output = syscon_gpio_dir_out; 1686a8a0c1dSAlexander Shiyan } 1696a8a0c1dSAlexander Shiyan 1706a8a0c1dSAlexander Shiyan platform_set_drvdata(pdev, priv); 1716a8a0c1dSAlexander Shiyan 1726a8a0c1dSAlexander Shiyan return gpiochip_add(&priv->chip); 1736a8a0c1dSAlexander Shiyan } 1746a8a0c1dSAlexander Shiyan 1756a8a0c1dSAlexander Shiyan static int syscon_gpio_remove(struct platform_device *pdev) 1766a8a0c1dSAlexander Shiyan { 1776a8a0c1dSAlexander Shiyan struct syscon_gpio_priv *priv = platform_get_drvdata(pdev); 1786a8a0c1dSAlexander Shiyan 1799f5132aeSabdoulaye berthe gpiochip_remove(&priv->chip); 1809f5132aeSabdoulaye berthe return 0; 1816a8a0c1dSAlexander Shiyan } 1826a8a0c1dSAlexander Shiyan 1836a8a0c1dSAlexander Shiyan static struct platform_driver syscon_gpio_driver = { 1846a8a0c1dSAlexander Shiyan .driver = { 1856a8a0c1dSAlexander Shiyan .name = "gpio-syscon", 1866a8a0c1dSAlexander Shiyan .owner = THIS_MODULE, 1876a8a0c1dSAlexander Shiyan .of_match_table = syscon_gpio_ids, 1886a8a0c1dSAlexander Shiyan }, 1896a8a0c1dSAlexander Shiyan .probe = syscon_gpio_probe, 1906a8a0c1dSAlexander Shiyan .remove = syscon_gpio_remove, 1916a8a0c1dSAlexander Shiyan }; 1926a8a0c1dSAlexander Shiyan module_platform_driver(syscon_gpio_driver); 1936a8a0c1dSAlexander Shiyan 1946a8a0c1dSAlexander Shiyan MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); 1956a8a0c1dSAlexander Shiyan MODULE_DESCRIPTION("SYSCON GPIO driver"); 1966a8a0c1dSAlexander Shiyan MODULE_LICENSE("GPL"); 197