/* * Pinctrl driver for Rockchip RK805 PMIC * * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd * * Author: Joseph Chen <chenjh@rock-chips.com> * * 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. * * Based on the pinctrl-as3722 driver */ #include <linux/gpio/driver.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mfd/rk808.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pinctrl/consumer.h> #include <linux/pinctrl/machine.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/pinmux.h> #include <linux/pm.h> #include <linux/slab.h> #include "core.h" #include "pinconf.h" #include "pinctrl-utils.h" struct rk805_pin_function { const char *name; const char *const *groups; unsigned int ngroups; int mux_option; }; struct rk805_pin_group { const char *name; const unsigned int pins[1]; unsigned int npins; }; /* * @reg: gpio setting register; * @fun_mask: functions select mask value, when set is gpio; * @dir_mask: input or output mask value, when set is output, otherwise input; * @val_mask: gpio set value, when set is level high, otherwise low; * * Different PMIC has different pin features, belowing 3 mask members are not * all necessary for every PMIC. For example, RK805 has 2 pins that can be used * as output only GPIOs, so func_mask and dir_mask are not needed. RK816 has 1 * pin that can be used as TS/GPIO, so fun_mask, dir_mask and val_mask are all * necessary. */ struct rk805_pin_config { u8 reg; u8 fun_msk; u8 dir_msk; u8 val_msk; }; struct rk805_pctrl_info { struct rk808 *rk808; struct device *dev; struct pinctrl_dev *pctl; struct gpio_chip gpio_chip; struct pinctrl_desc pinctrl_desc; const struct rk805_pin_function *functions; unsigned int num_functions; const struct rk805_pin_group *groups; int num_pin_groups; const struct pinctrl_pin_desc *pins; unsigned int num_pins; struct rk805_pin_config *pin_cfg; }; enum rk805_pinmux_option { RK805_PINMUX_GPIO, }; enum { RK805_GPIO0, RK805_GPIO1, }; static const char *const rk805_gpio_groups[] = { "gpio0", "gpio1", }; /* RK805: 2 output only GPIOs */ static const struct pinctrl_pin_desc rk805_pins_desc[] = { PINCTRL_PIN(RK805_GPIO0, "gpio0"), PINCTRL_PIN(RK805_GPIO1, "gpio1"), }; static const struct rk805_pin_function rk805_pin_functions[] = { { .name = "gpio", .groups = rk805_gpio_groups, .ngroups = ARRAY_SIZE(rk805_gpio_groups), .mux_option = RK805_PINMUX_GPIO, }, }; static const struct rk805_pin_group rk805_pin_groups[] = { { .name = "gpio0", .pins = { RK805_GPIO0 }, .npins = 1, }, { .name = "gpio1", .pins = { RK805_GPIO1 }, .npins = 1, }, }; #define RK805_GPIO0_VAL_MSK BIT(0) #define RK805_GPIO1_VAL_MSK BIT(1) static struct rk805_pin_config rk805_gpio_cfgs[] = { { .reg = RK805_OUT_REG, .val_msk = RK805_GPIO0_VAL_MSK, }, { .reg = RK805_OUT_REG, .val_msk = RK805_GPIO1_VAL_MSK, }, }; /* generic gpio chip */ static int rk805_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct rk805_pctrl_info *pci = gpiochip_get_data(chip); int ret, val; ret = regmap_read(pci->rk808->regmap, pci->pin_cfg[offset].reg, &val); if (ret) { dev_err(pci->dev, "get gpio%d value failed\n", offset); return ret; } return !!(val & pci->pin_cfg[offset].val_msk); } static void rk805_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct rk805_pctrl_info *pci = gpiochip_get_data(chip); int ret; ret = regmap_update_bits(pci->rk808->regmap, pci->pin_cfg[offset].reg, pci->pin_cfg[offset].val_msk, value ? pci->pin_cfg[offset].val_msk : 0); if (ret) dev_err(pci->dev, "set gpio%d value %d failed\n", offset, value); } static int rk805_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) { return pinctrl_gpio_direction_input(chip->base + offset); } static int rk805_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value) { rk805_gpio_set(chip, offset, value); return pinctrl_gpio_direction_output(chip->base + offset); } static int rk805_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { struct rk805_pctrl_info *pci = gpiochip_get_data(chip); unsigned int val; int ret; /* default output*/ if (!pci->pin_cfg[offset].dir_msk) return 0; ret = regmap_read(pci->rk808->regmap, pci->pin_cfg[offset].reg, &val); if (ret) { dev_err(pci->dev, "get gpio%d direction failed\n", offset); return ret; } return !(val & pci->pin_cfg[offset].dir_msk); } static struct gpio_chip rk805_gpio_chip = { .label = "rk805-gpio", .request = gpiochip_generic_request, .free = gpiochip_generic_free, .get_direction = rk805_gpio_get_direction, .get = rk805_gpio_get, .set = rk805_gpio_set, .direction_input = rk805_gpio_direction_input, .direction_output = rk805_gpio_direction_output, .can_sleep = true, .base = -1, .owner = THIS_MODULE, }; /* generic pinctrl */ static int rk805_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); return pci->num_pin_groups; } static const char *rk805_pinctrl_get_group_name(struct pinctrl_dev *pctldev, unsigned int group) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); return pci->groups[group].name; } static int rk805_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, unsigned int group, const unsigned int **pins, unsigned int *num_pins) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); *pins = pci->groups[group].pins; *num_pins = pci->groups[group].npins; return 0; } static const struct pinctrl_ops rk805_pinctrl_ops = { .get_groups_count = rk805_pinctrl_get_groups_count, .get_group_name = rk805_pinctrl_get_group_name, .get_group_pins = rk805_pinctrl_get_group_pins, .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, .dt_free_map = pinctrl_utils_free_map, }; static int rk805_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); return pci->num_functions; } static const char *rk805_pinctrl_get_func_name(struct pinctrl_dev *pctldev, unsigned int function) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); return pci->functions[function].name; } static int rk805_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, unsigned int function, const char *const **groups, unsigned int *const num_groups) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); *groups = pci->functions[function].groups; *num_groups = pci->functions[function].ngroups; return 0; } static int _rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned int offset, int mux) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); int ret; if (!pci->pin_cfg[offset].fun_msk) return 0; if (mux == RK805_PINMUX_GPIO) { ret = regmap_update_bits(pci->rk808->regmap, pci->pin_cfg[offset].reg, pci->pin_cfg[offset].fun_msk, pci->pin_cfg[offset].fun_msk); if (ret) { dev_err(pci->dev, "set gpio%d GPIO failed\n", offset); return ret; } } else { dev_err(pci->dev, "Couldn't find function mux %d\n", mux); return -EINVAL; } return 0; } static int rk805_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned int function, unsigned int group) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); int mux = pci->functions[function].mux_option; int offset = group; return _rk805_pinctrl_set_mux(pctldev, offset, mux); } static int rk805_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int offset, bool input) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); int ret; /* switch to gpio function */ ret = _rk805_pinctrl_set_mux(pctldev, offset, RK805_PINMUX_GPIO); if (ret) { dev_err(pci->dev, "set gpio%d mux failed\n", offset); return ret; } /* set direction */ if (!pci->pin_cfg[offset].dir_msk) return 0; ret = regmap_update_bits(pci->rk808->regmap, pci->pin_cfg[offset].reg, pci->pin_cfg[offset].dir_msk, input ? 0 : pci->pin_cfg[offset].dir_msk); if (ret) { dev_err(pci->dev, "set gpio%d direction failed\n", offset); return ret; } return ret; } static const struct pinmux_ops rk805_pinmux_ops = { .get_functions_count = rk805_pinctrl_get_funcs_count, .get_function_name = rk805_pinctrl_get_func_name, .get_function_groups = rk805_pinctrl_get_func_groups, .set_mux = rk805_pinctrl_set_mux, .gpio_set_direction = rk805_pmx_gpio_set_direction, }; static int rk805_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *config) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); enum pin_config_param param = pinconf_to_config_param(*config); u32 arg = 0; switch (param) { case PIN_CONFIG_OUTPUT: arg = rk805_gpio_get(&pci->gpio_chip, pin); break; default: dev_err(pci->dev, "Properties not supported\n"); return -ENOTSUPP; } *config = pinconf_to_config_packed(param, (u16)arg); return 0; } static int rk805_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *configs, unsigned int num_configs) { struct rk805_pctrl_info *pci = pinctrl_dev_get_drvdata(pctldev); enum pin_config_param param; u32 i, arg = 0; for (i = 0; i < num_configs; i++) { param = pinconf_to_config_param(configs[i]); arg = pinconf_to_config_argument(configs[i]); switch (param) { case PIN_CONFIG_OUTPUT: rk805_gpio_set(&pci->gpio_chip, pin, arg); rk805_pmx_gpio_set_direction(pctldev, NULL, pin, false); break; default: dev_err(pci->dev, "Properties not supported\n"); return -ENOTSUPP; } } return 0; } static const struct pinconf_ops rk805_pinconf_ops = { .pin_config_get = rk805_pinconf_get, .pin_config_set = rk805_pinconf_set, }; static struct pinctrl_desc rk805_pinctrl_desc = { .name = "rk805-pinctrl", .pctlops = &rk805_pinctrl_ops, .pmxops = &rk805_pinmux_ops, .confops = &rk805_pinconf_ops, .owner = THIS_MODULE, }; static int rk805_pinctrl_probe(struct platform_device *pdev) { struct rk805_pctrl_info *pci; int ret; pci = devm_kzalloc(&pdev->dev, sizeof(*pci), GFP_KERNEL); if (!pci) return -ENOMEM; pci->dev = &pdev->dev; pci->dev->of_node = pdev->dev.parent->of_node; pci->rk808 = dev_get_drvdata(pdev->dev.parent); pci->pinctrl_desc = rk805_pinctrl_desc; pci->gpio_chip = rk805_gpio_chip; pci->gpio_chip.parent = &pdev->dev; pci->gpio_chip.of_node = pdev->dev.parent->of_node; platform_set_drvdata(pdev, pci); switch (pci->rk808->variant) { case RK805_ID: pci->pins = rk805_pins_desc; pci->num_pins = ARRAY_SIZE(rk805_pins_desc); pci->functions = rk805_pin_functions; pci->num_functions = ARRAY_SIZE(rk805_pin_functions); pci->groups = rk805_pin_groups; pci->num_pin_groups = ARRAY_SIZE(rk805_pin_groups); pci->pinctrl_desc.pins = rk805_pins_desc; pci->pinctrl_desc.npins = ARRAY_SIZE(rk805_pins_desc); pci->pin_cfg = rk805_gpio_cfgs; pci->gpio_chip.ngpio = ARRAY_SIZE(rk805_gpio_cfgs); break; default: dev_err(&pdev->dev, "unsupported RK805 ID %lu\n", pci->rk808->variant); return -EINVAL; } /* Add gpio chip */ ret = devm_gpiochip_add_data(&pdev->dev, &pci->gpio_chip, pci); if (ret < 0) { dev_err(&pdev->dev, "Couldn't add gpiochip\n"); return ret; } /* Add pinctrl */ pci->pctl = devm_pinctrl_register(&pdev->dev, &pci->pinctrl_desc, pci); if (IS_ERR(pci->pctl)) { dev_err(&pdev->dev, "Couldn't add pinctrl\n"); return PTR_ERR(pci->pctl); } /* Add pin range */ ret = gpiochip_add_pin_range(&pci->gpio_chip, dev_name(&pdev->dev), 0, 0, pci->gpio_chip.ngpio); if (ret < 0) { dev_err(&pdev->dev, "Couldn't add gpiochip pin range\n"); return ret; } return 0; } static struct platform_driver rk805_pinctrl_driver = { .probe = rk805_pinctrl_probe, .driver = { .name = "rk805-pinctrl", }, }; module_platform_driver(rk805_pinctrl_driver); MODULE_DESCRIPTION("RK805 pin control and GPIO driver"); MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>"); MODULE_LICENSE("GPL v2");