diff options
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-moore.c')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-moore.c | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c new file mode 100644 index 000000000..5e00f93ac --- /dev/null +++ b/drivers/pinctrl/mediatek/pinctrl-moore.c @@ -0,0 +1,683 @@ +// 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 <sean.wang@mediatek.com> + * + */ + +#include <linux/gpio/driver.h> +#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]; + + 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]; + + 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]; + + /* 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]; + + 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]; + + 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]; + + 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]; + + 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 (!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 device_node *np) +{ + 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_node = np; + 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(np, "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; + + /* 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, pdev->dev.of_node); + if (err) { + dev_err(&pdev->dev, "Failed to add gpio_chip\n"); + return err; + } + + platform_set_drvdata(pdev, hw); + + return 0; +} |