/* * MAX77620 pin control driver. * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * * Author: * Chaitanya Bandi <bandik@nvidia.com> * Laxman Dewangan <ldewangan@nvidia.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. */ #include <linux/mfd/max77620.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/pinmux.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include "core.h" #include "pinconf.h" #include "pinctrl-utils.h" #define MAX77620_PIN_NUM 8 enum max77620_pin_ppdrv { MAX77620_PIN_UNCONFIG_DRV, MAX77620_PIN_OD_DRV, MAX77620_PIN_PP_DRV, }; enum max77620_pinconf_param { MAX77620_ACTIVE_FPS_SOURCE = PIN_CONFIG_END + 1, MAX77620_ACTIVE_FPS_POWER_ON_SLOTS, MAX77620_ACTIVE_FPS_POWER_DOWN_SLOTS, MAX77620_SUSPEND_FPS_SOURCE, MAX77620_SUSPEND_FPS_POWER_ON_SLOTS, MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS, }; struct max77620_pin_function { const char *name; const char * const *groups; unsigned int ngroups; int mux_option; }; static const struct pinconf_generic_params max77620_cfg_params[] = { { .property = "maxim,active-fps-source", .param = MAX77620_ACTIVE_FPS_SOURCE, }, { .property = "maxim,active-fps-power-up-slot", .param = MAX77620_ACTIVE_FPS_POWER_ON_SLOTS, }, { .property = "maxim,active-fps-power-down-slot", .param = MAX77620_ACTIVE_FPS_POWER_DOWN_SLOTS, }, { .property = "maxim,suspend-fps-source", .param = MAX77620_SUSPEND_FPS_SOURCE, }, { .property = "maxim,suspend-fps-power-up-slot", .param = MAX77620_SUSPEND_FPS_POWER_ON_SLOTS, }, { .property = "maxim,suspend-fps-power-down-slot", .param = MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS, }, }; enum max77620_alternate_pinmux_option { MAX77620_PINMUX_GPIO = 0, MAX77620_PINMUX_LOW_POWER_MODE_CONTROL_IN = 1, MAX77620_PINMUX_FLEXIBLE_POWER_SEQUENCER_OUT = 2, MAX77620_PINMUX_32K_OUT1 = 3, MAX77620_PINMUX_SD0_DYNAMIC_VOLTAGE_SCALING_IN = 4, MAX77620_PINMUX_SD1_DYNAMIC_VOLTAGE_SCALING_IN = 5, MAX77620_PINMUX_REFERENCE_OUT = 6, }; struct max77620_pingroup { const char *name; const unsigned int pins[1]; unsigned int npins; enum max77620_alternate_pinmux_option alt_option; }; struct max77620_pin_info { enum max77620_pin_ppdrv drv_type; int pull_config; }; struct max77620_fps_config { int active_fps_src; int active_power_up_slots; int active_power_down_slots; int suspend_fps_src; int suspend_power_up_slots; int suspend_power_down_slots; }; struct max77620_pctrl_info { struct device *dev; struct pinctrl_dev *pctl; struct regmap *rmap; int pins_current_opt[MAX77620_GPIO_NR]; const struct max77620_pin_function *functions; unsigned int num_functions; const struct max77620_pingroup *pin_groups; int num_pin_groups; const struct pinctrl_pin_desc *pins; unsigned int num_pins; struct max77620_pin_info pin_info[MAX77620_PIN_NUM]; struct max77620_fps_config fps_config[MAX77620_PIN_NUM]; }; static const struct pinctrl_pin_desc max77620_pins_desc[] = { PINCTRL_PIN(MAX77620_GPIO0, "gpio0"), PINCTRL_PIN(MAX77620_GPIO1, "gpio1"), PINCTRL_PIN(MAX77620_GPIO2, "gpio2"), PINCTRL_PIN(MAX77620_GPIO3, "gpio3"), PINCTRL_PIN(MAX77620_GPIO4, "gpio4"), PINCTRL_PIN(MAX77620_GPIO5, "gpio5"), PINCTRL_PIN(MAX77620_GPIO6, "gpio6"), PINCTRL_PIN(MAX77620_GPIO7, "gpio7"), }; static const char * const gpio_groups[] = { "gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", }; #define FUNCTION_GROUP(fname, mux) \ { \ .name = fname, \ .groups = gpio_groups, \ .ngroups = ARRAY_SIZE(gpio_groups), \ .mux_option = MAX77620_PINMUX_##mux, \ } static const struct max77620_pin_function max77620_pin_function[] = { FUNCTION_GROUP("gpio", GPIO), FUNCTION_GROUP("lpm-control-in", LOW_POWER_MODE_CONTROL_IN), FUNCTION_GROUP("fps-out", FLEXIBLE_POWER_SEQUENCER_OUT), FUNCTION_GROUP("32k-out1", 32K_OUT1), FUNCTION_GROUP("sd0-dvs-in", SD0_DYNAMIC_VOLTAGE_SCALING_IN), FUNCTION_GROUP("sd1-dvs-in", SD1_DYNAMIC_VOLTAGE_SCALING_IN), FUNCTION_GROUP("reference-out", REFERENCE_OUT), }; #define MAX77620_PINGROUP(pg_name, pin_id, option) \ { \ .name = #pg_name, \ .pins = {MAX77620_##pin_id}, \ .npins = 1, \ .alt_option = MAX77620_PINMUX_##option, \ } static const struct max77620_pingroup max77620_pingroups[] = { MAX77620_PINGROUP(gpio0, GPIO0, LOW_POWER_MODE_CONTROL_IN), MAX77620_PINGROUP(gpio1, GPIO1, FLEXIBLE_POWER_SEQUENCER_OUT), MAX77620_PINGROUP(gpio2, GPIO2, FLEXIBLE_POWER_SEQUENCER_OUT), MAX77620_PINGROUP(gpio3, GPIO3, FLEXIBLE_POWER_SEQUENCER_OUT), MAX77620_PINGROUP(gpio4, GPIO4, 32K_OUT1), MAX77620_PINGROUP(gpio5, GPIO5, SD0_DYNAMIC_VOLTAGE_SCALING_IN), MAX77620_PINGROUP(gpio6, GPIO6, SD1_DYNAMIC_VOLTAGE_SCALING_IN), MAX77620_PINGROUP(gpio7, GPIO7, REFERENCE_OUT), }; static int max77620_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); return mpci->num_pin_groups; } static const char *max77620_pinctrl_get_group_name( struct pinctrl_dev *pctldev, unsigned int group) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); return mpci->pin_groups[group].name; } static int max77620_pinctrl_get_group_pins( struct pinctrl_dev *pctldev, unsigned int group, const unsigned int **pins, unsigned int *num_pins) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); *pins = mpci->pin_groups[group].pins; *num_pins = mpci->pin_groups[group].npins; return 0; } static const struct pinctrl_ops max77620_pinctrl_ops = { .get_groups_count = max77620_pinctrl_get_groups_count, .get_group_name = max77620_pinctrl_get_group_name, .get_group_pins = max77620_pinctrl_get_group_pins, .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, .dt_free_map = pinctrl_utils_free_map, }; static int max77620_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); return mpci->num_functions; } static const char *max77620_pinctrl_get_func_name(struct pinctrl_dev *pctldev, unsigned int function) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); return mpci->functions[function].name; } static int max77620_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, unsigned int function, const char * const **groups, unsigned int * const num_groups) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); *groups = mpci->functions[function].groups; *num_groups = mpci->functions[function].ngroups; return 0; } static int max77620_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned int function, unsigned int group) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); u8 val; int ret; if (function == MAX77620_PINMUX_GPIO) { val = 0; } else if (function == mpci->pin_groups[group].alt_option) { val = 1 << group; } else { dev_err(mpci->dev, "GPIO %u doesn't have function %u\n", group, function); return -EINVAL; } ret = regmap_update_bits(mpci->rmap, MAX77620_REG_AME_GPIO, BIT(group), val); if (ret < 0) dev_err(mpci->dev, "REG AME GPIO update failed: %d\n", ret); return ret; } static const struct pinmux_ops max77620_pinmux_ops = { .get_functions_count = max77620_pinctrl_get_funcs_count, .get_function_name = max77620_pinctrl_get_func_name, .get_function_groups = max77620_pinctrl_get_func_groups, .set_mux = max77620_pinctrl_enable, }; static int max77620_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *config) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); struct device *dev = mpci->dev; enum pin_config_param param = pinconf_to_config_param(*config); unsigned int val; int arg = 0; int ret; switch (param) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: if (mpci->pin_info[pin].drv_type == MAX77620_PIN_OD_DRV) arg = 1; break; case PIN_CONFIG_DRIVE_PUSH_PULL: if (mpci->pin_info[pin].drv_type == MAX77620_PIN_PP_DRV) arg = 1; break; case PIN_CONFIG_BIAS_PULL_UP: ret = regmap_read(mpci->rmap, MAX77620_REG_PUE_GPIO, &val); if (ret < 0) { dev_err(dev, "Reg PUE_GPIO read failed: %d\n", ret); return ret; } if (val & BIT(pin)) arg = 1; break; case PIN_CONFIG_BIAS_PULL_DOWN: ret = regmap_read(mpci->rmap, MAX77620_REG_PDE_GPIO, &val); if (ret < 0) { dev_err(dev, "Reg PDE_GPIO read failed: %d\n", ret); return ret; } if (val & BIT(pin)) arg = 1; break; default: dev_err(dev, "Properties not supported\n"); return -ENOTSUPP; } *config = pinconf_to_config_packed(param, (u16)arg); return 0; } static int max77620_get_default_fps(struct max77620_pctrl_info *mpci, int addr, int *fps) { unsigned int val; int ret; ret = regmap_read(mpci->rmap, addr, &val); if (ret < 0) { dev_err(mpci->dev, "Reg PUE_GPIO read failed: %d\n", ret); return ret; } *fps = (val & MAX77620_FPS_SRC_MASK) >> MAX77620_FPS_SRC_SHIFT; return 0; } static int max77620_set_fps_param(struct max77620_pctrl_info *mpci, int pin, int param) { struct max77620_fps_config *fps_config = &mpci->fps_config[pin]; int addr, ret; int param_val; int mask, shift; if ((pin < MAX77620_GPIO1) || (pin > MAX77620_GPIO3)) return 0; addr = MAX77620_REG_FPS_GPIO1 + pin - 1; switch (param) { case MAX77620_ACTIVE_FPS_SOURCE: case MAX77620_SUSPEND_FPS_SOURCE: mask = MAX77620_FPS_SRC_MASK; shift = MAX77620_FPS_SRC_SHIFT; param_val = fps_config->active_fps_src; if (param == MAX77620_SUSPEND_FPS_SOURCE) param_val = fps_config->suspend_fps_src; break; case MAX77620_ACTIVE_FPS_POWER_ON_SLOTS: case MAX77620_SUSPEND_FPS_POWER_ON_SLOTS: mask = MAX77620_FPS_PU_PERIOD_MASK; shift = MAX77620_FPS_PU_PERIOD_SHIFT; param_val = fps_config->active_power_up_slots; if (param == MAX77620_SUSPEND_FPS_POWER_ON_SLOTS) param_val = fps_config->suspend_power_up_slots; break; case MAX77620_ACTIVE_FPS_POWER_DOWN_SLOTS: case MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS: mask = MAX77620_FPS_PD_PERIOD_MASK; shift = MAX77620_FPS_PD_PERIOD_SHIFT; param_val = fps_config->active_power_down_slots; if (param == MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS) param_val = fps_config->suspend_power_down_slots; break; default: dev_err(mpci->dev, "Invalid parameter %d for pin %d\n", param, pin); return -EINVAL; } if (param_val < 0) return 0; ret = regmap_update_bits(mpci->rmap, addr, mask, param_val << shift); if (ret < 0) dev_err(mpci->dev, "Reg 0x%02x update failed %d\n", addr, ret); return ret; } static int max77620_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *configs, unsigned int num_configs) { struct max77620_pctrl_info *mpci = pinctrl_dev_get_drvdata(pctldev); struct device *dev = mpci->dev; struct max77620_fps_config *fps_config; int param; u32 param_val; unsigned int val; unsigned int pu_val; unsigned int pd_val; int addr, ret; int i; for (i = 0; i < num_configs; i++) { param = pinconf_to_config_param(configs[i]); param_val = pinconf_to_config_argument(configs[i]); switch (param) { case PIN_CONFIG_DRIVE_OPEN_DRAIN: val = param_val ? 0 : 1; ret = regmap_update_bits(mpci->rmap, MAX77620_REG_GPIO0 + pin, MAX77620_CNFG_GPIO_DRV_MASK, val); if (ret) goto report_update_failure; mpci->pin_info[pin].drv_type = val ? MAX77620_PIN_PP_DRV : MAX77620_PIN_OD_DRV; break; case PIN_CONFIG_DRIVE_PUSH_PULL: val = param_val ? 1 : 0; ret = regmap_update_bits(mpci->rmap, MAX77620_REG_GPIO0 + pin, MAX77620_CNFG_GPIO_DRV_MASK, val); if (ret) goto report_update_failure; mpci->pin_info[pin].drv_type = val ? MAX77620_PIN_PP_DRV : MAX77620_PIN_OD_DRV; break; case MAX77620_ACTIVE_FPS_SOURCE: case MAX77620_ACTIVE_FPS_POWER_ON_SLOTS: case MAX77620_ACTIVE_FPS_POWER_DOWN_SLOTS: if ((pin < MAX77620_GPIO1) || (pin > MAX77620_GPIO3)) return -EINVAL; fps_config = &mpci->fps_config[pin]; if ((param == MAX77620_ACTIVE_FPS_SOURCE) && (param_val == MAX77620_FPS_SRC_DEF)) { addr = MAX77620_REG_FPS_GPIO1 + pin - 1; ret = max77620_get_default_fps( mpci, addr, &fps_config->active_fps_src); if (ret < 0) return ret; break; } if (param == MAX77620_ACTIVE_FPS_SOURCE) fps_config->active_fps_src = param_val; else if (param == MAX77620_ACTIVE_FPS_POWER_ON_SLOTS) fps_config->active_power_up_slots = param_val; else fps_config->active_power_down_slots = param_val; ret = max77620_set_fps_param(mpci, pin, param); if (ret < 0) return ret; break; case MAX77620_SUSPEND_FPS_SOURCE: case MAX77620_SUSPEND_FPS_POWER_ON_SLOTS: case MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS: if ((pin < MAX77620_GPIO1) || (pin > MAX77620_GPIO3)) return -EINVAL; fps_config = &mpci->fps_config[pin]; if ((param == MAX77620_SUSPEND_FPS_SOURCE) && (param_val == MAX77620_FPS_SRC_DEF)) { addr = MAX77620_REG_FPS_GPIO1 + pin - 1; ret = max77620_get_default_fps( mpci, addr, &fps_config->suspend_fps_src); if (ret < 0) return ret; break; } if (param == MAX77620_SUSPEND_FPS_SOURCE) fps_config->suspend_fps_src = param_val; else if (param == MAX77620_SUSPEND_FPS_POWER_ON_SLOTS) fps_config->suspend_power_up_slots = param_val; else fps_config->suspend_power_down_slots = param_val; break; case PIN_CONFIG_BIAS_PULL_UP: case PIN_CONFIG_BIAS_PULL_DOWN: pu_val = (param == PIN_CONFIG_BIAS_PULL_UP) ? BIT(pin) : 0; pd_val = (param == PIN_CONFIG_BIAS_PULL_DOWN) ? BIT(pin) : 0; ret = regmap_update_bits(mpci->rmap, MAX77620_REG_PUE_GPIO, BIT(pin), pu_val); if (ret < 0) { dev_err(dev, "PUE_GPIO update failed: %d\n", ret); return ret; } ret = regmap_update_bits(mpci->rmap, MAX77620_REG_PDE_GPIO, BIT(pin), pd_val); if (ret < 0) { dev_err(dev, "PDE_GPIO update failed: %d\n", ret); return ret; } break; default: dev_err(dev, "Properties not supported\n"); return -ENOTSUPP; } } return 0; report_update_failure: dev_err(dev, "Reg 0x%02x update failed %d\n", MAX77620_REG_GPIO0 + pin, ret); return ret; } static const struct pinconf_ops max77620_pinconf_ops = { .pin_config_get = max77620_pinconf_get, .pin_config_set = max77620_pinconf_set, }; static struct pinctrl_desc max77620_pinctrl_desc = { .pctlops = &max77620_pinctrl_ops, .pmxops = &max77620_pinmux_ops, .confops = &max77620_pinconf_ops, }; static int max77620_pinctrl_probe(struct platform_device *pdev) { struct max77620_chip *max77620 = dev_get_drvdata(pdev->dev.parent); struct max77620_pctrl_info *mpci; int i; mpci = devm_kzalloc(&pdev->dev, sizeof(*mpci), GFP_KERNEL); if (!mpci) return -ENOMEM; mpci->dev = &pdev->dev; mpci->dev->of_node = pdev->dev.parent->of_node; mpci->rmap = max77620->rmap; mpci->pins = max77620_pins_desc; mpci->num_pins = ARRAY_SIZE(max77620_pins_desc); mpci->functions = max77620_pin_function; mpci->num_functions = ARRAY_SIZE(max77620_pin_function); mpci->pin_groups = max77620_pingroups; mpci->num_pin_groups = ARRAY_SIZE(max77620_pingroups); platform_set_drvdata(pdev, mpci); max77620_pinctrl_desc.name = dev_name(&pdev->dev); max77620_pinctrl_desc.pins = max77620_pins_desc; max77620_pinctrl_desc.npins = ARRAY_SIZE(max77620_pins_desc); max77620_pinctrl_desc.num_custom_params = ARRAY_SIZE(max77620_cfg_params); max77620_pinctrl_desc.custom_params = max77620_cfg_params; for (i = 0; i < MAX77620_PIN_NUM; ++i) { mpci->fps_config[i].active_fps_src = -1; mpci->fps_config[i].active_power_up_slots = -1; mpci->fps_config[i].active_power_down_slots = -1; mpci->fps_config[i].suspend_fps_src = -1; mpci->fps_config[i].suspend_power_up_slots = -1; mpci->fps_config[i].suspend_power_down_slots = -1; } mpci->pctl = devm_pinctrl_register(&pdev->dev, &max77620_pinctrl_desc, mpci); if (IS_ERR(mpci->pctl)) { dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); return PTR_ERR(mpci->pctl); } return 0; } #ifdef CONFIG_PM_SLEEP static int max77620_suspend_fps_param[] = { MAX77620_SUSPEND_FPS_SOURCE, MAX77620_SUSPEND_FPS_POWER_ON_SLOTS, MAX77620_SUSPEND_FPS_POWER_DOWN_SLOTS, }; static int max77620_active_fps_param[] = { MAX77620_ACTIVE_FPS_SOURCE, MAX77620_ACTIVE_FPS_POWER_ON_SLOTS, MAX77620_ACTIVE_FPS_POWER_DOWN_SLOTS, }; static int max77620_pinctrl_suspend(struct device *dev) { struct max77620_pctrl_info *mpci = dev_get_drvdata(dev); int pin, p; for (pin = 0; pin < MAX77620_PIN_NUM; ++pin) { if ((pin < MAX77620_GPIO1) || (pin > MAX77620_GPIO3)) continue; for (p = 0; p < 3; ++p) max77620_set_fps_param( mpci, pin, max77620_suspend_fps_param[p]); } return 0; }; static int max77620_pinctrl_resume(struct device *dev) { struct max77620_pctrl_info *mpci = dev_get_drvdata(dev); int pin, p; for (pin = 0; pin < MAX77620_PIN_NUM; ++pin) { if ((pin < MAX77620_GPIO1) || (pin > MAX77620_GPIO3)) continue; for (p = 0; p < 3; ++p) max77620_set_fps_param( mpci, pin, max77620_active_fps_param[p]); } return 0; } #endif static const struct dev_pm_ops max77620_pinctrl_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS( max77620_pinctrl_suspend, max77620_pinctrl_resume) }; static const struct platform_device_id max77620_pinctrl_devtype[] = { { .name = "max77620-pinctrl", }, { .name = "max20024-pinctrl", }, {}, }; MODULE_DEVICE_TABLE(platform, max77620_pinctrl_devtype); static struct platform_driver max77620_pinctrl_driver = { .driver = { .name = "max77620-pinctrl", .pm = &max77620_pinctrl_pm_ops, }, .probe = max77620_pinctrl_probe, .id_table = max77620_pinctrl_devtype, }; module_platform_driver(max77620_pinctrl_driver); MODULE_DESCRIPTION("MAX77620/MAX20024 pin control driver"); MODULE_AUTHOR("Chaitanya Bandi<bandik@nvidia.com>"); MODULE_AUTHOR("Laxman Dewangan<ldewangan@nvidia.com>"); MODULE_ALIAS("platform:max77620-pinctrl"); MODULE_LICENSE("GPL v2");