/* * Copyright (c) 2015, Sony Mobile Communications AB. * Copyright (c) 2013, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "../core.h" #include "../pinctrl-utils.h" /* mode */ #define PM8XXX_GPIO_MODE_ENABLED BIT(0) #define PM8XXX_GPIO_MODE_INPUT 0 #define PM8XXX_GPIO_MODE_OUTPUT 2 /* output buffer */ #define PM8XXX_GPIO_PUSH_PULL 0 #define PM8XXX_GPIO_OPEN_DRAIN 1 /* bias */ #define PM8XXX_GPIO_BIAS_PU_30 0 #define PM8XXX_GPIO_BIAS_PU_1P5 1 #define PM8XXX_GPIO_BIAS_PU_31P5 2 #define PM8XXX_GPIO_BIAS_PU_1P5_30 3 #define PM8XXX_GPIO_BIAS_PD 4 #define PM8XXX_GPIO_BIAS_NP 5 /* GPIO registers */ #define SSBI_REG_ADDR_GPIO_BASE 0x150 #define SSBI_REG_ADDR_GPIO(n) (SSBI_REG_ADDR_GPIO_BASE + n) #define PM8XXX_BANK_WRITE BIT(7) #define PM8XXX_MAX_GPIOS 44 /* custom pinconf parameters */ #define PM8XXX_QCOM_DRIVE_STRENGH (PIN_CONFIG_END + 1) #define PM8XXX_QCOM_PULL_UP_STRENGTH (PIN_CONFIG_END + 2) /** * struct pm8xxx_pin_data - dynamic configuration for a pin * @reg: address of the control register * @irq: IRQ from the PMIC interrupt controller * @power_source: logical selected voltage source, mapping in static data * is used translate to register values * @mode: operating mode for the pin (input/output) * @open_drain: output buffer configured as open-drain (vs push-pull) * @output_value: configured output value * @bias: register view of configured bias * @pull_up_strength: placeholder for selected pull up strength * only used to configure bias when pull up is selected * @output_strength: selector of output-strength * @disable: pin disabled / configured as tristate * @function: pinmux selector * @inverted: pin logic is inverted */ struct pm8xxx_pin_data { unsigned reg; int irq; u8 power_source; u8 mode; bool open_drain; bool output_value; u8 bias; u8 pull_up_strength; u8 output_strength; bool disable; u8 function; bool inverted; }; struct pm8xxx_gpio { struct device *dev; struct regmap *regmap; struct pinctrl_dev *pctrl; struct gpio_chip chip; struct pinctrl_desc desc; unsigned npins; }; static const struct pinconf_generic_params pm8xxx_gpio_bindings[] = { {"qcom,drive-strength", PM8XXX_QCOM_DRIVE_STRENGH, 0}, {"qcom,pull-up-strength", PM8XXX_QCOM_PULL_UP_STRENGTH, 0}, }; #ifdef CONFIG_DEBUG_FS static const struct pin_config_item pm8xxx_conf_items[ARRAY_SIZE(pm8xxx_gpio_bindings)] = { PCONFDUMP(PM8XXX_QCOM_DRIVE_STRENGH, "drive-strength", NULL, true), PCONFDUMP(PM8XXX_QCOM_PULL_UP_STRENGTH, "pull up strength", NULL, true), }; #endif static const char * const pm8xxx_groups[PM8XXX_MAX_GPIOS] = { "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", "gpio8", "gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15", "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22", "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29", "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35", "gpio36", "gpio37", "gpio38", "gpio39", "gpio40", "gpio41", "gpio42", "gpio43", "gpio44", }; static const char * const pm8xxx_gpio_functions[] = { PMIC_GPIO_FUNC_NORMAL, PMIC_GPIO_FUNC_PAIRED, PMIC_GPIO_FUNC_FUNC1, PMIC_GPIO_FUNC_FUNC2, PMIC_GPIO_FUNC_DTEST1, PMIC_GPIO_FUNC_DTEST2, PMIC_GPIO_FUNC_DTEST3, PMIC_GPIO_FUNC_DTEST4, }; static int pm8xxx_read_bank(struct pm8xxx_gpio *pctrl, struct pm8xxx_pin_data *pin, int bank) { unsigned int val = bank << 4; int ret; ret = regmap_write(pctrl->regmap, pin->reg, val); if (ret) { dev_err(pctrl->dev, "failed to select bank %d\n", bank); return ret; } ret = regmap_read(pctrl->regmap, pin->reg, &val); if (ret) { dev_err(pctrl->dev, "failed to read register %d\n", bank); return ret; } return val; } static int pm8xxx_write_bank(struct pm8xxx_gpio *pctrl, struct pm8xxx_pin_data *pin, int bank, u8 val) { int ret; val |= PM8XXX_BANK_WRITE; val |= bank << 4; ret = regmap_write(pctrl->regmap, pin->reg, val); if (ret) dev_err(pctrl->dev, "failed to write register\n"); return ret; } static int pm8xxx_get_groups_count(struct pinctrl_dev *pctldev) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); return pctrl->npins; } static const char *pm8xxx_get_group_name(struct pinctrl_dev *pctldev, unsigned group) { return pm8xxx_groups[group]; } static int pm8xxx_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, const unsigned **pins, unsigned *num_pins) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); *pins = &pctrl->desc.pins[group].number; *num_pins = 1; return 0; } static const struct pinctrl_ops pm8xxx_pinctrl_ops = { .get_groups_count = pm8xxx_get_groups_count, .get_group_name = pm8xxx_get_group_name, .get_group_pins = pm8xxx_get_group_pins, .dt_node_to_map = pinconf_generic_dt_node_to_map_group, .dt_free_map = pinctrl_utils_dt_free_map, }; static int pm8xxx_get_functions_count(struct pinctrl_dev *pctldev) { return ARRAY_SIZE(pm8xxx_gpio_functions); } static const char *pm8xxx_get_function_name(struct pinctrl_dev *pctldev, unsigned function) { return pm8xxx_gpio_functions[function]; } static int pm8xxx_get_function_groups(struct pinctrl_dev *pctldev, unsigned function, const char * const **groups, unsigned * const num_groups) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); *groups = pm8xxx_groups; *num_groups = pctrl->npins; return 0; } static int pm8xxx_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function, unsigned group) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); struct pm8xxx_pin_data *pin = pctrl->desc.pins[group].drv_data; u8 val; pin->function = function; val = pin->function << 1; pm8xxx_write_bank(pctrl, pin, 4, val); return 0; } static const struct pinmux_ops pm8xxx_pinmux_ops = { .get_functions_count = pm8xxx_get_functions_count, .get_function_name = pm8xxx_get_function_name, .get_function_groups = pm8xxx_get_function_groups, .set_mux = pm8xxx_pinmux_set_mux, }; static int pm8xxx_pin_config_get(struct pinctrl_dev *pctldev, unsigned int offset, unsigned long *config) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; unsigned param = pinconf_to_config_param(*config); unsigned arg; switch (param) { case PIN_CONFIG_BIAS_DISABLE: arg = pin->bias == PM8XXX_GPIO_BIAS_NP; break; case PIN_CONFIG_BIAS_PULL_DOWN: arg = pin->bias == PM8XXX_GPIO_BIAS_PD; break; case PIN_CONFIG_BIAS_PULL_UP: arg = pin->bias <= PM8XXX_GPIO_BIAS_PU_1P5_30; break; case PM8XXX_QCOM_PULL_UP_STRENGTH: arg = pin->pull_up_strength; break; case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: arg = pin->disable; break; case PIN_CONFIG_INPUT_ENABLE: arg = pin->mode == PM8XXX_GPIO_MODE_INPUT; break; case PIN_CONFIG_OUTPUT: if (pin->mode & PM8XXX_GPIO_MODE_OUTPUT) arg = pin->output_value; else arg = 0; break; case PIN_CONFIG_POWER_SOURCE: arg = pin->power_source; break; case PM8XXX_QCOM_DRIVE_STRENGH: arg = pin->output_strength; break; case PIN_CONFIG_DRIVE_PUSH_PULL: arg = !pin->open_drain; break; case PIN_CONFIG_DRIVE_OPEN_DRAIN: arg = pin->open_drain; break; default: return -EINVAL; } *config = pinconf_to_config_packed(param, arg); return 0; } static int pm8xxx_pin_config_set(struct pinctrl_dev *pctldev, unsigned int offset, unsigned long *configs, unsigned num_configs) { struct pm8xxx_gpio *pctrl = pinctrl_dev_get_drvdata(pctldev); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; unsigned param; unsigned arg; unsigned i; u8 banks = 0; u8 val; 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_BIAS_DISABLE: pin->bias = PM8XXX_GPIO_BIAS_NP; banks |= BIT(2); pin->disable = 0; banks |= BIT(3); break; case PIN_CONFIG_BIAS_PULL_DOWN: pin->bias = PM8XXX_GPIO_BIAS_PD; banks |= BIT(2); pin->disable = 0; banks |= BIT(3); break; case PM8XXX_QCOM_PULL_UP_STRENGTH: if (arg > PM8XXX_GPIO_BIAS_PU_1P5_30) { dev_err(pctrl->dev, "invalid pull-up strength\n"); return -EINVAL; } pin->pull_up_strength = arg; /* FALLTHROUGH */ case PIN_CONFIG_BIAS_PULL_UP: pin->bias = pin->pull_up_strength; banks |= BIT(2); pin->disable = 0; banks |= BIT(3); break; case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: pin->disable = 1; banks |= BIT(3); break; case PIN_CONFIG_INPUT_ENABLE: pin->mode = PM8XXX_GPIO_MODE_INPUT; banks |= BIT(0) | BIT(1); break; case PIN_CONFIG_OUTPUT: pin->mode = PM8XXX_GPIO_MODE_OUTPUT; pin->output_value = !!arg; banks |= BIT(0) | BIT(1); break; case PIN_CONFIG_POWER_SOURCE: pin->power_source = arg; banks |= BIT(0); break; case PM8XXX_QCOM_DRIVE_STRENGH: if (arg > PMIC_GPIO_STRENGTH_LOW) { dev_err(pctrl->dev, "invalid drive strength\n"); return -EINVAL; } pin->output_strength = arg; banks |= BIT(3); break; case PIN_CONFIG_DRIVE_PUSH_PULL: pin->open_drain = 0; banks |= BIT(1); break; case PIN_CONFIG_DRIVE_OPEN_DRAIN: pin->open_drain = 1; banks |= BIT(1); break; default: dev_err(pctrl->dev, "unsupported config parameter: %x\n", param); return -EINVAL; } } if (banks & BIT(0)) { val = pin->power_source << 1; val |= PM8XXX_GPIO_MODE_ENABLED; pm8xxx_write_bank(pctrl, pin, 0, val); } if (banks & BIT(1)) { val = pin->mode << 2; val |= pin->open_drain << 1; val |= pin->output_value; pm8xxx_write_bank(pctrl, pin, 1, val); } if (banks & BIT(2)) { val = pin->bias << 1; pm8xxx_write_bank(pctrl, pin, 2, val); } if (banks & BIT(3)) { val = pin->output_strength << 2; val |= pin->disable; pm8xxx_write_bank(pctrl, pin, 3, val); } if (banks & BIT(4)) { val = pin->function << 1; pm8xxx_write_bank(pctrl, pin, 4, val); } if (banks & BIT(5)) { val = 0; if (!pin->inverted) val |= BIT(3); pm8xxx_write_bank(pctrl, pin, 5, val); } return 0; } static const struct pinconf_ops pm8xxx_pinconf_ops = { .is_generic = true, .pin_config_group_get = pm8xxx_pin_config_get, .pin_config_group_set = pm8xxx_pin_config_set, }; static struct pinctrl_desc pm8xxx_pinctrl_desc = { .name = "pm8xxx_gpio", .pctlops = &pm8xxx_pinctrl_ops, .pmxops = &pm8xxx_pinmux_ops, .confops = &pm8xxx_pinconf_ops, .owner = THIS_MODULE, }; static int pm8xxx_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; u8 val; pin->mode = PM8XXX_GPIO_MODE_INPUT; val = pin->mode << 2; pm8xxx_write_bank(pctrl, pin, 1, val); return 0; } static int pm8xxx_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; u8 val; pin->mode = PM8XXX_GPIO_MODE_OUTPUT; pin->output_value = !!value; val = pin->mode << 2; val |= pin->open_drain << 1; val |= pin->output_value; pm8xxx_write_bank(pctrl, pin, 1, val); return 0; } static int pm8xxx_gpio_get(struct gpio_chip *chip, unsigned offset) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; bool state; int ret; if (pin->mode == PM8XXX_GPIO_MODE_OUTPUT) { ret = pin->output_value; } else { ret = irq_get_irqchip_state(pin->irq, IRQCHIP_STATE_LINE_LEVEL, &state); if (!ret) ret = state; } return !!ret; } static void pm8xxx_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; u8 val; pin->output_value = !!value; val = pin->mode << 2; val |= pin->open_drain << 1; val |= pin->output_value; pm8xxx_write_bank(pctrl, pin, 1, val); } static int pm8xxx_gpio_of_xlate(struct gpio_chip *chip, const struct of_phandle_args *gpio_desc, u32 *flags) { if (chip->of_gpio_n_cells < 2) return -EINVAL; if (flags) *flags = gpio_desc->args[1]; return gpio_desc->args[0] - 1; } static int pm8xxx_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; return pin->irq; } #ifdef CONFIG_DEBUG_FS #include static void pm8xxx_gpio_dbg_show_one(struct seq_file *s, struct pinctrl_dev *pctldev, struct gpio_chip *chip, unsigned offset, unsigned gpio) { struct pm8xxx_gpio *pctrl = container_of(chip, struct pm8xxx_gpio, chip); struct pm8xxx_pin_data *pin = pctrl->desc.pins[offset].drv_data; static const char * const modes[] = { "in", "both", "out", "off" }; static const char * const biases[] = { "pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA", "pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull" }; static const char * const buffer_types[] = { "push-pull", "open-drain" }; static const char * const strengths[] = { "no", "high", "medium", "low" }; seq_printf(s, " gpio%-2d:", offset + 1); if (pin->disable) { seq_puts(s, " ---"); } else { seq_printf(s, " %-4s", modes[pin->mode]); seq_printf(s, " %-7s", pm8xxx_gpio_functions[pin->function]); seq_printf(s, " VIN%d", pin->power_source); seq_printf(s, " %-27s", biases[pin->bias]); seq_printf(s, " %-10s", buffer_types[pin->open_drain]); seq_printf(s, " %-4s", pin->output_value ? "high" : "low"); seq_printf(s, " %-7s", strengths[pin->output_strength]); if (pin->inverted) seq_puts(s, " inverted"); } } static void pm8xxx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) { unsigned gpio = chip->base; unsigned i; for (i = 0; i < chip->ngpio; i++, gpio++) { pm8xxx_gpio_dbg_show_one(s, NULL, chip, i, gpio); seq_puts(s, "\n"); } } #else #define pm8xxx_gpio_dbg_show NULL #endif static struct gpio_chip pm8xxx_gpio_template = { .direction_input = pm8xxx_gpio_direction_input, .direction_output = pm8xxx_gpio_direction_output, .get = pm8xxx_gpio_get, .set = pm8xxx_gpio_set, .of_xlate = pm8xxx_gpio_of_xlate, .to_irq = pm8xxx_gpio_to_irq, .dbg_show = pm8xxx_gpio_dbg_show, .owner = THIS_MODULE, }; static int pm8xxx_pin_populate(struct pm8xxx_gpio *pctrl, struct pm8xxx_pin_data *pin) { int val; val = pm8xxx_read_bank(pctrl, pin, 0); if (val < 0) return val; pin->power_source = (val >> 1) & 0x7; val = pm8xxx_read_bank(pctrl, pin, 1); if (val < 0) return val; pin->mode = (val >> 2) & 0x3; pin->open_drain = !!(val & BIT(1)); pin->output_value = val & BIT(0); val = pm8xxx_read_bank(pctrl, pin, 2); if (val < 0) return val; pin->bias = (val >> 1) & 0x7; if (pin->bias <= PM8XXX_GPIO_BIAS_PU_1P5_30) pin->pull_up_strength = pin->bias; else pin->pull_up_strength = PM8XXX_GPIO_BIAS_PU_30; val = pm8xxx_read_bank(pctrl, pin, 3); if (val < 0) return val; pin->output_strength = (val >> 2) & 0x3; pin->disable = val & BIT(0); val = pm8xxx_read_bank(pctrl, pin, 4); if (val < 0) return val; pin->function = (val >> 1) & 0x7; val = pm8xxx_read_bank(pctrl, pin, 5); if (val < 0) return val; pin->inverted = !(val & BIT(3)); return 0; } static const struct of_device_id pm8xxx_gpio_of_match[] = { { .compatible = "qcom,pm8018-gpio", .data = (void *)6 }, { .compatible = "qcom,pm8038-gpio", .data = (void *)12 }, { .compatible = "qcom,pm8058-gpio", .data = (void *)40 }, { .compatible = "qcom,pm8917-gpio", .data = (void *)38 }, { .compatible = "qcom,pm8921-gpio", .data = (void *)44 }, { }, }; MODULE_DEVICE_TABLE(of, pm8xxx_gpio_of_match); static int pm8xxx_gpio_probe(struct platform_device *pdev) { struct pm8xxx_pin_data *pin_data; struct pinctrl_pin_desc *pins; struct pm8xxx_gpio *pctrl; int ret; int i; pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); if (!pctrl) return -ENOMEM; pctrl->dev = &pdev->dev; pctrl->npins = (unsigned long)of_device_get_match_data(&pdev->dev); pctrl->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!pctrl->regmap) { dev_err(&pdev->dev, "parent regmap unavailable\n"); return -ENXIO; } pctrl->desc = pm8xxx_pinctrl_desc; pctrl->desc.npins = pctrl->npins; pins = devm_kcalloc(&pdev->dev, pctrl->desc.npins, sizeof(struct pinctrl_pin_desc), GFP_KERNEL); if (!pins) return -ENOMEM; pin_data = devm_kcalloc(&pdev->dev, pctrl->desc.npins, sizeof(struct pm8xxx_pin_data), GFP_KERNEL); if (!pin_data) return -ENOMEM; for (i = 0; i < pctrl->desc.npins; i++) { pin_data[i].reg = SSBI_REG_ADDR_GPIO(i); pin_data[i].irq = platform_get_irq(pdev, i); if (pin_data[i].irq < 0) { dev_err(&pdev->dev, "missing interrupts for pin %d\n", i); return pin_data[i].irq; } ret = pm8xxx_pin_populate(pctrl, &pin_data[i]); if (ret) return ret; pins[i].number = i; pins[i].name = pm8xxx_groups[i]; pins[i].drv_data = &pin_data[i]; } pctrl->desc.pins = pins; pctrl->desc.num_custom_params = ARRAY_SIZE(pm8xxx_gpio_bindings); pctrl->desc.custom_params = pm8xxx_gpio_bindings; #ifdef CONFIG_DEBUG_FS pctrl->desc.custom_conf_items = pm8xxx_conf_items; #endif pctrl->pctrl = pinctrl_register(&pctrl->desc, &pdev->dev, pctrl); if (IS_ERR(pctrl->pctrl)) { dev_err(&pdev->dev, "couldn't register pm8xxx gpio driver\n"); return PTR_ERR(pctrl->pctrl); } pctrl->chip = pm8xxx_gpio_template; pctrl->chip.base = -1; pctrl->chip.parent = &pdev->dev; pctrl->chip.of_node = pdev->dev.of_node; pctrl->chip.of_gpio_n_cells = 2; pctrl->chip.label = dev_name(pctrl->dev); pctrl->chip.ngpio = pctrl->npins; ret = gpiochip_add(&pctrl->chip); if (ret) { dev_err(&pdev->dev, "failed register gpiochip\n"); goto unregister_pinctrl; } ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, pctrl->chip.ngpio); if (ret) { dev_err(pctrl->dev, "failed to add pin range\n"); goto unregister_gpiochip; } platform_set_drvdata(pdev, pctrl); dev_dbg(&pdev->dev, "Qualcomm pm8xxx gpio driver probed\n"); return 0; unregister_gpiochip: gpiochip_remove(&pctrl->chip); unregister_pinctrl: pinctrl_unregister(pctrl->pctrl); return ret; } static int pm8xxx_gpio_remove(struct platform_device *pdev) { struct pm8xxx_gpio *pctrl = platform_get_drvdata(pdev); gpiochip_remove(&pctrl->chip); pinctrl_unregister(pctrl->pctrl); return 0; } static struct platform_driver pm8xxx_gpio_driver = { .driver = { .name = "qcom-ssbi-gpio", .of_match_table = pm8xxx_gpio_of_match, }, .probe = pm8xxx_gpio_probe, .remove = pm8xxx_gpio_remove, }; module_platform_driver(pm8xxx_gpio_driver); MODULE_AUTHOR("Bjorn Andersson "); MODULE_DESCRIPTION("Qualcomm PM8xxx GPIO driver"); MODULE_LICENSE("GPL v2");