// SPDX-License-Identifier: GPL-2.0 /* * MediaTek Pinctrl Moore Driver, which implement the generic dt-binding * pinctrl-bindings.txt for MediaTek SoC. * * Copyright (C) 2017-2018 MediaTek Inc. * Author: Sean Wang * */ #include #include "pinctrl-moore.h" #define PINCTRL_PINCTRL_DEV KBUILD_MODNAME /* Custom pinconf parameters */ #define MTK_PIN_CONFIG_TDSEL (PIN_CONFIG_END + 1) #define MTK_PIN_CONFIG_RDSEL (PIN_CONFIG_END + 2) #define MTK_PIN_CONFIG_PU_ADV (PIN_CONFIG_END + 3) #define MTK_PIN_CONFIG_PD_ADV (PIN_CONFIG_END + 4) static const struct pinconf_generic_params mtk_custom_bindings[] = { {"mediatek,tdsel", MTK_PIN_CONFIG_TDSEL, 0}, {"mediatek,rdsel", MTK_PIN_CONFIG_RDSEL, 0}, {"mediatek,pull-up-adv", MTK_PIN_CONFIG_PU_ADV, 1}, {"mediatek,pull-down-adv", MTK_PIN_CONFIG_PD_ADV, 1}, }; #ifdef CONFIG_DEBUG_FS static const struct pin_config_item mtk_conf_items[] = { PCONFDUMP(MTK_PIN_CONFIG_TDSEL, "tdsel", NULL, true), PCONFDUMP(MTK_PIN_CONFIG_RDSEL, "rdsel", NULL, true), PCONFDUMP(MTK_PIN_CONFIG_PU_ADV, "pu-adv", NULL, true), PCONFDUMP(MTK_PIN_CONFIG_PD_ADV, "pd-adv", NULL, true), }; #endif static int mtk_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int selector, unsigned int group) { struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev); struct function_desc *func; struct group_desc *grp; int i; func = pinmux_generic_get_function(pctldev, selector); if (!func) return -EINVAL; grp = pinctrl_generic_get_group(pctldev, group); if (!grp) return -EINVAL; dev_dbg(pctldev->dev, "enable function %s group %s\n", func->name, grp->name); for (i = 0; i < grp->num_pins; i++) { const struct mtk_pin_desc *desc; int *pin_modes = grp->data; int pin = grp->pins[i]; desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin]; if (!desc->name) return -ENOTSUPP; mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE, pin_modes[i]); } return 0; } static int mtk_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int pin) { struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev); const struct mtk_pin_desc *desc; desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin]; if (!desc->name) return -ENOTSUPP; return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE, hw->soc->gpio_m); } static int mtk_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int pin, bool input) { struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev); const struct mtk_pin_desc *desc; desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin]; if (!desc->name) return -ENOTSUPP; /* hardware would take 0 as input direction */ return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !input); } static int mtk_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *config) { struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev); u32 param = pinconf_to_config_param(*config); int val, val2, err, reg, ret = 1; const struct mtk_pin_desc *desc; desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin]; if (!desc->name) return -ENOTSUPP; switch (param) { case PIN_CONFIG_BIAS_DISABLE: if (hw->soc->bias_disable_get) { err = hw->soc->bias_disable_get(hw, desc, &ret); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_BIAS_PULL_UP: if (hw->soc->bias_get) { err = hw->soc->bias_get(hw, desc, 1, &ret); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_BIAS_PULL_DOWN: if (hw->soc->bias_get) { err = hw->soc->bias_get(hw, desc, 0, &ret); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_SLEW_RATE: err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &val); if (err) return err; if (!val) return -EINVAL; break; case PIN_CONFIG_INPUT_ENABLE: case PIN_CONFIG_OUTPUT_ENABLE: err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val); if (err) return err; /* HW takes input mode as zero; output mode as non-zero */ if ((val && param == PIN_CONFIG_INPUT_ENABLE) || (!val && param == PIN_CONFIG_OUTPUT_ENABLE)) return -EINVAL; break; case PIN_CONFIG_INPUT_SCHMITT_ENABLE: err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val); if (err) return err; err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &val2); if (err) return err; if (val || !val2) return -EINVAL; break; case PIN_CONFIG_DRIVE_STRENGTH: if (hw->soc->drive_get) { err = hw->soc->drive_get(hw, desc, &ret); if (err) return err; } else { err = -ENOTSUPP; } break; case MTK_PIN_CONFIG_TDSEL: case MTK_PIN_CONFIG_RDSEL: reg = (param == MTK_PIN_CONFIG_TDSEL) ? PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL; err = mtk_hw_get_value(hw, desc, reg, &val); if (err) return err; ret = val; break; case MTK_PIN_CONFIG_PU_ADV: case MTK_PIN_CONFIG_PD_ADV: if (hw->soc->adv_pull_get) { bool pullup; pullup = param == MTK_PIN_CONFIG_PU_ADV; err = hw->soc->adv_pull_get(hw, desc, pullup, &ret); if (err) return err; } else { return -ENOTSUPP; } break; default: return -ENOTSUPP; } *config = pinconf_to_config_packed(param, ret); return 0; } static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, unsigned long *configs, unsigned int num_configs) { struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev); const struct mtk_pin_desc *desc; u32 reg, param, arg; int cfg, err = 0; desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin]; if (!desc->name) return -ENOTSUPP; for (cfg = 0; cfg < num_configs; cfg++) { param = pinconf_to_config_param(configs[cfg]); arg = pinconf_to_config_argument(configs[cfg]); switch (param) { case PIN_CONFIG_BIAS_DISABLE: if (hw->soc->bias_disable_set) { err = hw->soc->bias_disable_set(hw, desc); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_BIAS_PULL_UP: if (hw->soc->bias_set) { err = hw->soc->bias_set(hw, desc, 1); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_BIAS_PULL_DOWN: if (hw->soc->bias_set) { err = hw->soc->bias_set(hw, desc, 0); if (err) return err; } else { return -ENOTSUPP; } break; case PIN_CONFIG_OUTPUT_ENABLE: err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_DISABLE); if (err) goto err; err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_OUTPUT); if (err) goto err; break; case PIN_CONFIG_INPUT_ENABLE: if (hw->soc->ies_present) { mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, MTK_ENABLE); } err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT); if (err) goto err; break; case PIN_CONFIG_SLEW_RATE: err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, arg); if (err) goto err; break; case PIN_CONFIG_OUTPUT: err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_OUTPUT); if (err) goto err; err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, arg); if (err) goto err; break; case PIN_CONFIG_INPUT_SCHMITT_ENABLE: /* arg = 1: Input mode & SMT enable ; * arg = 0: Output mode & SMT disable */ arg = arg ? 2 : 1; err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, arg & 1); if (err) goto err; err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, !!(arg & 2)); if (err) goto err; break; case PIN_CONFIG_DRIVE_STRENGTH: if (hw->soc->drive_set) { err = hw->soc->drive_set(hw, desc, arg); if (err) return err; } else { err = -ENOTSUPP; } break; case MTK_PIN_CONFIG_TDSEL: case MTK_PIN_CONFIG_RDSEL: reg = (param == MTK_PIN_CONFIG_TDSEL) ? PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL; err = mtk_hw_set_value(hw, desc, reg, arg); if (err) goto err; break; case MTK_PIN_CONFIG_PU_ADV: case MTK_PIN_CONFIG_PD_ADV: if (hw->soc->adv_pull_set) { bool pullup; pullup = param == MTK_PIN_CONFIG_PU_ADV; err = hw->soc->adv_pull_set(hw, desc, pullup, arg); if (err) return err; } else { return -ENOTSUPP; } break; default: err = -ENOTSUPP; } } err: return err; } static int mtk_pinconf_group_get(struct pinctrl_dev *pctldev, unsigned int group, unsigned long *config) { const unsigned int *pins; unsigned int i, npins, old = 0; int ret; ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins); if (ret) return ret; for (i = 0; i < npins; i++) { if (mtk_pinconf_get(pctldev, pins[i], config)) return -ENOTSUPP; /* configs do not match between two pins */ if (i && old != *config) return -ENOTSUPP; old = *config; } return 0; } static int mtk_pinconf_group_set(struct pinctrl_dev *pctldev, unsigned int group, unsigned long *configs, unsigned int num_configs) { const unsigned int *pins; unsigned int i, npins; int ret; ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins); if (ret) return ret; for (i = 0; i < npins; i++) { ret = mtk_pinconf_set(pctldev, pins[i], configs, num_configs); if (ret) return ret; } return 0; } static const struct pinctrl_ops mtk_pctlops = { .get_groups_count = pinctrl_generic_get_group_count, .get_group_name = pinctrl_generic_get_group_name, .get_group_pins = pinctrl_generic_get_group_pins, .dt_node_to_map = pinconf_generic_dt_node_to_map_all, .dt_free_map = pinconf_generic_dt_free_map, }; static const struct pinmux_ops mtk_pmxops = { .get_functions_count = pinmux_generic_get_function_count, .get_function_name = pinmux_generic_get_function_name, .get_function_groups = pinmux_generic_get_function_groups, .set_mux = mtk_pinmux_set_mux, .gpio_request_enable = mtk_pinmux_gpio_request_enable, .gpio_set_direction = mtk_pinmux_gpio_set_direction, .strict = true, }; static const struct pinconf_ops mtk_confops = { .is_generic = true, .pin_config_get = mtk_pinconf_get, .pin_config_set = mtk_pinconf_set, .pin_config_group_get = mtk_pinconf_group_get, .pin_config_group_set = mtk_pinconf_group_set, .pin_config_config_dbg_show = pinconf_generic_dump_config, }; static struct pinctrl_desc mtk_desc = { .name = PINCTRL_PINCTRL_DEV, .pctlops = &mtk_pctlops, .pmxops = &mtk_pmxops, .confops = &mtk_confops, .owner = THIS_MODULE, }; static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio) { struct mtk_pinctrl *hw = gpiochip_get_data(chip); const struct mtk_pin_desc *desc; int value, err; desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio]; if (!desc->name) return -ENOTSUPP; err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value); if (err) return err; return !!value; } static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value) { struct mtk_pinctrl *hw = gpiochip_get_data(chip); const struct mtk_pin_desc *desc; desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio]; if (!desc->name) { dev_err(hw->dev, "Failed to set gpio %d\n", gpio); return; } mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value); } static int mtk_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio) { return pinctrl_gpio_direction_input(chip->base + gpio); } static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio, int value) { mtk_gpio_set(chip, gpio, value); return pinctrl_gpio_direction_output(chip->base + gpio); } static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) { struct mtk_pinctrl *hw = gpiochip_get_data(chip); const struct mtk_pin_desc *desc; if (!hw->eint) return -ENOTSUPP; desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset]; if (desc->eint.eint_n == (u16)EINT_NA) return -ENOTSUPP; return mtk_eint_find_irq(hw->eint, desc->eint.eint_n); } static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset, unsigned long config) { struct mtk_pinctrl *hw = gpiochip_get_data(chip); const struct mtk_pin_desc *desc; u32 debounce; desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset]; if (!desc->name) return -ENOTSUPP; if (!hw->eint || pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE || desc->eint.eint_n == (u16)EINT_NA) return -ENOTSUPP; debounce = pinconf_to_config_argument(config); return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, debounce); } static int mtk_build_gpiochip(struct mtk_pinctrl *hw) { struct gpio_chip *chip = &hw->chip; int ret; chip->label = PINCTRL_PINCTRL_DEV; chip->parent = hw->dev; chip->request = gpiochip_generic_request; chip->free = gpiochip_generic_free; chip->direction_input = mtk_gpio_direction_input; chip->direction_output = mtk_gpio_direction_output; chip->get = mtk_gpio_get; chip->set = mtk_gpio_set; chip->to_irq = mtk_gpio_to_irq; chip->set_config = mtk_gpio_set_config; chip->base = -1; chip->ngpio = hw->soc->npins; chip->of_gpio_n_cells = 2; ret = gpiochip_add_data(chip, hw); if (ret < 0) return ret; /* Just for backward compatible for these old pinctrl nodes without * "gpio-ranges" property. Otherwise, called directly from a * DeviceTree-supported pinctrl driver is DEPRECATED. * Please see Section 2.1 of * Documentation/devicetree/bindings/gpio/gpio.txt on how to * bind pinctrl and gpio drivers via the "gpio-ranges" property. */ if (!of_find_property(hw->dev->of_node, "gpio-ranges", NULL)) { ret = gpiochip_add_pin_range(chip, dev_name(hw->dev), 0, 0, chip->ngpio); if (ret < 0) { gpiochip_remove(chip); return ret; } } return 0; } static int mtk_build_groups(struct mtk_pinctrl *hw) { int err, i; for (i = 0; i < hw->soc->ngrps; i++) { const struct group_desc *group = hw->soc->grps + i; err = pinctrl_generic_add_group(hw->pctrl, group->name, group->pins, group->num_pins, group->data); if (err < 0) { dev_err(hw->dev, "Failed to register group %s\n", group->name); return err; } } return 0; } static int mtk_build_functions(struct mtk_pinctrl *hw) { int i, err; for (i = 0; i < hw->soc->nfuncs ; i++) { const struct function_desc *func = hw->soc->funcs + i; err = pinmux_generic_add_function(hw->pctrl, func->name, func->group_names, func->num_group_names, func->data); if (err < 0) { dev_err(hw->dev, "Failed to register function %s\n", func->name); return err; } } return 0; } int mtk_moore_pinctrl_probe(struct platform_device *pdev, const struct mtk_pin_soc *soc) { struct pinctrl_pin_desc *pins; struct mtk_pinctrl *hw; int err, i; hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL); if (!hw) return -ENOMEM; hw->soc = soc; hw->dev = &pdev->dev; if (!hw->soc->nbase_names) { dev_err(&pdev->dev, "SoC should be assigned at least one register base\n"); return -EINVAL; } hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names, sizeof(*hw->base), GFP_KERNEL); if (!hw->base) return -ENOMEM; for (i = 0; i < hw->soc->nbase_names; i++) { hw->base[i] = devm_platform_ioremap_resource_byname(pdev, hw->soc->base_names[i]); if (IS_ERR(hw->base[i])) return PTR_ERR(hw->base[i]); } hw->nbase = hw->soc->nbase_names; spin_lock_init(&hw->lock); /* Copy from internal struct mtk_pin_desc to register to the core */ pins = devm_kmalloc_array(&pdev->dev, hw->soc->npins, sizeof(*pins), GFP_KERNEL); if (!pins) return -ENOMEM; for (i = 0; i < hw->soc->npins; i++) { pins[i].number = hw->soc->pins[i].number; pins[i].name = hw->soc->pins[i].name; } /* Setup pins descriptions per SoC types */ mtk_desc.pins = (const struct pinctrl_pin_desc *)pins; mtk_desc.npins = hw->soc->npins; mtk_desc.num_custom_params = ARRAY_SIZE(mtk_custom_bindings); mtk_desc.custom_params = mtk_custom_bindings; #ifdef CONFIG_DEBUG_FS mtk_desc.custom_conf_items = mtk_conf_items; #endif err = devm_pinctrl_register_and_init(&pdev->dev, &mtk_desc, hw, &hw->pctrl); if (err) return err; /* Setup groups descriptions per SoC types */ err = mtk_build_groups(hw); if (err) { dev_err(&pdev->dev, "Failed to build groups\n"); return err; } /* Setup functions descriptions per SoC types */ err = mtk_build_functions(hw); if (err) { dev_err(&pdev->dev, "Failed to build functions\n"); return err; } /* For able to make pinctrl_claim_hogs, we must not enable pinctrl * until all groups and functions are being added one. */ err = pinctrl_enable(hw->pctrl); if (err) return err; err = mtk_build_eint(hw, pdev); if (err) dev_warn(&pdev->dev, "Failed to add EINT, but pinctrl still can work\n"); /* Build gpiochip should be after pinctrl_enable is done */ err = mtk_build_gpiochip(hw); if (err) { dev_err(&pdev->dev, "Failed to add gpio_chip\n"); return err; } platform_set_drvdata(pdev, hw); return 0; }