// SPDX-License-Identifier: GPL-2.0-only /* * Pin controller and GPIO driver for Amlogic Meson SoCs * * Copyright (C) 2014 Beniamino Galvani */ /* * The available pins are organized in banks (A,B,C,D,E,X,Y,Z,AO, * BOOT,CARD for meson6, X,Y,DV,H,Z,AO,BOOT,CARD for meson8 and * X,Y,DV,H,AO,BOOT,CARD,DIF for meson8b) and each bank has a * variable number of pins. * * The AO bank is special because it belongs to the Always-On power * domain which can't be powered off; the bank also uses a set of * registers different from the other banks. * * For each pin controller there are 4 different register ranges that * control the following properties of the pins: * 1) pin muxing * 2) pull enable/disable * 3) pull up/down * 4) GPIO direction, output value, input value * * In some cases the register ranges for pull enable and pull * direction are the same and thus there are only 3 register ranges. * * Since Meson G12A SoC, the ao register ranges for gpio, pull enable * and pull direction are the same, so there are only 2 register ranges. * * For the pull and GPIO configuration every bank uses a contiguous * set of bits in the register sets described above; the same register * can be shared by more banks with different offsets. * * In addition to this there are some registers shared between all * banks that control the IRQ functionality. This feature is not * supported at the moment by the driver. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../core.h" #include "../pinctrl-utils.h" #include "pinctrl-meson.h" static const unsigned int meson_bit_strides[] = { 1, 1, 1, 1, 1, 2, 1 }; /** * meson_get_bank() - find the bank containing a given pin * * @pc: the pinctrl instance * @pin: the pin number * @bank: the found bank * * Return: 0 on success, a negative value on error */ static int meson_get_bank(struct meson_pinctrl *pc, unsigned int pin, const struct meson_bank **bank) { int i; for (i = 0; i < pc->data->num_banks; i++) { if (pin >= pc->data->banks[i].first && pin <= pc->data->banks[i].last) { *bank = &pc->data->banks[i]; return 0; } } return -EINVAL; } /** * meson_calc_reg_and_bit() - calculate register and bit for a pin * * @bank: the bank containing the pin * @pin: the pin number * @reg_type: the type of register needed (pull-enable, pull, etc...) * @reg: the computed register offset * @bit: the computed bit */ static void meson_calc_reg_and_bit(const struct meson_bank *bank, unsigned int pin, enum meson_reg_type reg_type, unsigned int *reg, unsigned int *bit) { const struct meson_reg_desc *desc = &bank->regs[reg_type]; *bit = (desc->bit + pin - bank->first) * meson_bit_strides[reg_type]; *reg = (desc->reg + (*bit / 32)) * 4; *bit &= 0x1f; } static int meson_get_groups_count(struct pinctrl_dev *pcdev) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); return pc->data->num_groups; } static const char *meson_get_group_name(struct pinctrl_dev *pcdev, unsigned selector) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); return pc->data->groups[selector].name; } static int meson_get_group_pins(struct pinctrl_dev *pcdev, unsigned selector, const unsigned **pins, unsigned *num_pins) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); *pins = pc->data->groups[selector].pins; *num_pins = pc->data->groups[selector].num_pins; return 0; } static void meson_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s, unsigned offset) { seq_printf(s, " %s", dev_name(pcdev->dev)); } static const struct pinctrl_ops meson_pctrl_ops = { .get_groups_count = meson_get_groups_count, .get_group_name = meson_get_group_name, .get_group_pins = meson_get_group_pins, .dt_node_to_map = pinconf_generic_dt_node_to_map_all, .dt_free_map = pinctrl_utils_free_map, .pin_dbg_show = meson_pin_dbg_show, }; int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); return pc->data->num_funcs; } EXPORT_SYMBOL_GPL(meson_pmx_get_funcs_count); const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev, unsigned selector) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); return pc->data->funcs[selector].name; } EXPORT_SYMBOL_GPL(meson_pmx_get_func_name); int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector, const char * const **groups, unsigned * const num_groups) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); *groups = pc->data->funcs[selector].groups; *num_groups = pc->data->funcs[selector].num_groups; return 0; } EXPORT_SYMBOL_GPL(meson_pmx_get_groups); static int meson_pinconf_set_gpio_bit(struct meson_pinctrl *pc, unsigned int pin, unsigned int reg_type, bool arg) { const struct meson_bank *bank; unsigned int reg, bit; int ret; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, reg_type, ®, &bit); return regmap_update_bits(pc->reg_gpio, reg, BIT(bit), arg ? BIT(bit) : 0); } static int meson_pinconf_get_gpio_bit(struct meson_pinctrl *pc, unsigned int pin, unsigned int reg_type) { const struct meson_bank *bank; unsigned int reg, bit, val; int ret; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, reg_type, ®, &bit); ret = regmap_read(pc->reg_gpio, reg, &val); if (ret) return ret; return BIT(bit) & val ? 1 : 0; } static int meson_pinconf_set_output(struct meson_pinctrl *pc, unsigned int pin, bool out) { return meson_pinconf_set_gpio_bit(pc, pin, MESON_REG_DIR, !out); } static int meson_pinconf_get_output(struct meson_pinctrl *pc, unsigned int pin) { int ret = meson_pinconf_get_gpio_bit(pc, pin, MESON_REG_DIR); if (ret < 0) return ret; return !ret; } static int meson_pinconf_set_drive(struct meson_pinctrl *pc, unsigned int pin, bool high) { return meson_pinconf_set_gpio_bit(pc, pin, MESON_REG_OUT, high); } static int meson_pinconf_get_drive(struct meson_pinctrl *pc, unsigned int pin) { return meson_pinconf_get_gpio_bit(pc, pin, MESON_REG_OUT); } static int meson_pinconf_set_output_drive(struct meson_pinctrl *pc, unsigned int pin, bool high) { int ret; ret = meson_pinconf_set_output(pc, pin, true); if (ret) return ret; return meson_pinconf_set_drive(pc, pin, high); } static int meson_pinconf_disable_bias(struct meson_pinctrl *pc, unsigned int pin) { const struct meson_bank *bank; unsigned int reg, bit = 0; int ret; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_PULLEN, ®, &bit); ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit), 0); if (ret) return ret; return 0; } static int meson_pinconf_enable_bias(struct meson_pinctrl *pc, unsigned int pin, bool pull_up) { const struct meson_bank *bank; unsigned int reg, bit, val = 0; int ret; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_PULL, ®, &bit); if (pull_up) val = BIT(bit); ret = regmap_update_bits(pc->reg_pull, reg, BIT(bit), val); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_PULLEN, ®, &bit); ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit), BIT(bit)); if (ret) return ret; return 0; } static int meson_pinconf_set_drive_strength(struct meson_pinctrl *pc, unsigned int pin, u16 drive_strength_ua) { const struct meson_bank *bank; unsigned int reg, bit, ds_val; int ret; if (!pc->reg_ds) { dev_err(pc->dev, "drive-strength not supported\n"); return -ENOTSUPP; } ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_DS, ®, &bit); if (drive_strength_ua <= 500) { ds_val = MESON_PINCONF_DRV_500UA; } else if (drive_strength_ua <= 2500) { ds_val = MESON_PINCONF_DRV_2500UA; } else if (drive_strength_ua <= 3000) { ds_val = MESON_PINCONF_DRV_3000UA; } else if (drive_strength_ua <= 4000) { ds_val = MESON_PINCONF_DRV_4000UA; } else { dev_warn_once(pc->dev, "pin %u: invalid drive-strength : %d , default to 4mA\n", pin, drive_strength_ua); ds_val = MESON_PINCONF_DRV_4000UA; } ret = regmap_update_bits(pc->reg_ds, reg, 0x3 << bit, ds_val << bit); if (ret) return ret; return 0; } static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin, unsigned long *configs, unsigned num_configs) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); enum pin_config_param param; unsigned int arg = 0; int i, ret; for (i = 0; i < num_configs; i++) { param = pinconf_to_config_param(configs[i]); switch (param) { case PIN_CONFIG_DRIVE_STRENGTH_UA: case PIN_CONFIG_OUTPUT_ENABLE: case PIN_CONFIG_OUTPUT: arg = pinconf_to_config_argument(configs[i]); break; default: break; } switch (param) { case PIN_CONFIG_BIAS_DISABLE: ret = meson_pinconf_disable_bias(pc, pin); break; case PIN_CONFIG_BIAS_PULL_UP: ret = meson_pinconf_enable_bias(pc, pin, true); break; case PIN_CONFIG_BIAS_PULL_DOWN: ret = meson_pinconf_enable_bias(pc, pin, false); break; case PIN_CONFIG_DRIVE_STRENGTH_UA: ret = meson_pinconf_set_drive_strength(pc, pin, arg); break; case PIN_CONFIG_OUTPUT_ENABLE: ret = meson_pinconf_set_output(pc, pin, arg); break; case PIN_CONFIG_OUTPUT: ret = meson_pinconf_set_output_drive(pc, pin, arg); break; default: ret = -ENOTSUPP; } if (ret) return ret; } return 0; } static int meson_pinconf_get_pull(struct meson_pinctrl *pc, unsigned int pin) { const struct meson_bank *bank; unsigned int reg, bit, val; int ret, conf; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_PULLEN, ®, &bit); ret = regmap_read(pc->reg_pullen, reg, &val); if (ret) return ret; if (!(val & BIT(bit))) { conf = PIN_CONFIG_BIAS_DISABLE; } else { meson_calc_reg_and_bit(bank, pin, MESON_REG_PULL, ®, &bit); ret = regmap_read(pc->reg_pull, reg, &val); if (ret) return ret; if (val & BIT(bit)) conf = PIN_CONFIG_BIAS_PULL_UP; else conf = PIN_CONFIG_BIAS_PULL_DOWN; } return conf; } static int meson_pinconf_get_drive_strength(struct meson_pinctrl *pc, unsigned int pin, u16 *drive_strength_ua) { const struct meson_bank *bank; unsigned int reg, bit; unsigned int val; int ret; if (!pc->reg_ds) return -ENOTSUPP; ret = meson_get_bank(pc, pin, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, pin, MESON_REG_DS, ®, &bit); ret = regmap_read(pc->reg_ds, reg, &val); if (ret) return ret; switch ((val >> bit) & 0x3) { case MESON_PINCONF_DRV_500UA: *drive_strength_ua = 500; break; case MESON_PINCONF_DRV_2500UA: *drive_strength_ua = 2500; break; case MESON_PINCONF_DRV_3000UA: *drive_strength_ua = 3000; break; case MESON_PINCONF_DRV_4000UA: *drive_strength_ua = 4000; break; default: return -EINVAL; } return 0; } static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin, unsigned long *config) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); enum pin_config_param param = pinconf_to_config_param(*config); u16 arg; int ret; switch (param) { case PIN_CONFIG_BIAS_DISABLE: case PIN_CONFIG_BIAS_PULL_DOWN: case PIN_CONFIG_BIAS_PULL_UP: if (meson_pinconf_get_pull(pc, pin) == param) arg = 1; else return -EINVAL; break; case PIN_CONFIG_DRIVE_STRENGTH_UA: ret = meson_pinconf_get_drive_strength(pc, pin, &arg); if (ret) return ret; break; case PIN_CONFIG_OUTPUT_ENABLE: ret = meson_pinconf_get_output(pc, pin); if (ret <= 0) return -EINVAL; arg = 1; break; case PIN_CONFIG_OUTPUT: ret = meson_pinconf_get_output(pc, pin); if (ret <= 0) return -EINVAL; ret = meson_pinconf_get_drive(pc, pin); if (ret < 0) return -EINVAL; arg = ret; break; default: return -ENOTSUPP; } *config = pinconf_to_config_packed(param, arg); dev_dbg(pc->dev, "pinconf for pin %u is %lu\n", pin, *config); return 0; } static int meson_pinconf_group_set(struct pinctrl_dev *pcdev, unsigned int num_group, unsigned long *configs, unsigned num_configs) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); const struct meson_pmx_group *group = &pc->data->groups[num_group]; int i; dev_dbg(pc->dev, "set pinconf for group %s\n", group->name); for (i = 0; i < group->num_pins; i++) { meson_pinconf_set(pcdev, group->pins[i], configs, num_configs); } return 0; } static int meson_pinconf_group_get(struct pinctrl_dev *pcdev, unsigned int group, unsigned long *config) { return -ENOTSUPP; } static const struct pinconf_ops meson_pinconf_ops = { .pin_config_get = meson_pinconf_get, .pin_config_set = meson_pinconf_set, .pin_config_group_get = meson_pinconf_group_get, .pin_config_group_set = meson_pinconf_group_set, .is_generic = true, }; static int meson_gpio_get_direction(struct gpio_chip *chip, unsigned gpio) { struct meson_pinctrl *pc = gpiochip_get_data(chip); int ret; ret = meson_pinconf_get_output(pc, gpio); if (ret < 0) return ret; return ret ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; } static int meson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { return meson_pinconf_set_output(gpiochip_get_data(chip), gpio, false); } static int meson_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value) { return meson_pinconf_set_output_drive(gpiochip_get_data(chip), gpio, value); } static void meson_gpio_set(struct gpio_chip *chip, unsigned gpio, int value) { meson_pinconf_set_drive(gpiochip_get_data(chip), gpio, value); } static int meson_gpio_get(struct gpio_chip *chip, unsigned gpio) { struct meson_pinctrl *pc = gpiochip_get_data(chip); const struct meson_bank *bank; unsigned int reg, bit, val; int ret; ret = meson_get_bank(pc, gpio, &bank); if (ret) return ret; meson_calc_reg_and_bit(bank, gpio, MESON_REG_IN, ®, &bit); regmap_read(pc->reg_gpio, reg, &val); return !!(val & BIT(bit)); } static int meson_gpiolib_register(struct meson_pinctrl *pc) { int ret; pc->chip.label = pc->data->name; pc->chip.parent = pc->dev; pc->chip.fwnode = pc->fwnode; pc->chip.request = gpiochip_generic_request; pc->chip.free = gpiochip_generic_free; pc->chip.set_config = gpiochip_generic_config; pc->chip.get_direction = meson_gpio_get_direction; pc->chip.direction_input = meson_gpio_direction_input; pc->chip.direction_output = meson_gpio_direction_output; pc->chip.get = meson_gpio_get; pc->chip.set = meson_gpio_set; pc->chip.base = -1; pc->chip.ngpio = pc->data->num_pins; pc->chip.can_sleep = false; ret = gpiochip_add_data(&pc->chip, pc); if (ret) { dev_err(pc->dev, "can't add gpio chip %s\n", pc->data->name); return ret; } return 0; } static struct regmap_config meson_regmap_config = { .reg_bits = 32, .val_bits = 32, .reg_stride = 4, }; static struct regmap *meson_map_resource(struct meson_pinctrl *pc, struct device_node *node, char *name) { struct resource res; void __iomem *base; int i; i = of_property_match_string(node, "reg-names", name); if (of_address_to_resource(node, i, &res)) return NULL; base = devm_ioremap_resource(pc->dev, &res); if (IS_ERR(base)) return ERR_CAST(base); meson_regmap_config.max_register = resource_size(&res) - 4; meson_regmap_config.name = devm_kasprintf(pc->dev, GFP_KERNEL, "%pOFn-%s", node, name); if (!meson_regmap_config.name) return ERR_PTR(-ENOMEM); return devm_regmap_init_mmio(pc->dev, base, &meson_regmap_config); } static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc) { struct device_node *gpio_np; unsigned int chips; chips = gpiochip_node_count(pc->dev); if (!chips) { dev_err(pc->dev, "no gpio node found\n"); return -EINVAL; } if (chips > 1) { dev_err(pc->dev, "multiple gpio nodes\n"); return -EINVAL; } pc->fwnode = gpiochip_node_get_first(pc->dev); gpio_np = to_of_node(pc->fwnode); pc->reg_mux = meson_map_resource(pc, gpio_np, "mux"); if (IS_ERR_OR_NULL(pc->reg_mux)) { dev_err(pc->dev, "mux registers not found\n"); return pc->reg_mux ? PTR_ERR(pc->reg_mux) : -ENOENT; } pc->reg_gpio = meson_map_resource(pc, gpio_np, "gpio"); if (IS_ERR_OR_NULL(pc->reg_gpio)) { dev_err(pc->dev, "gpio registers not found\n"); return pc->reg_gpio ? PTR_ERR(pc->reg_gpio) : -ENOENT; } pc->reg_pull = meson_map_resource(pc, gpio_np, "pull"); if (IS_ERR(pc->reg_pull)) pc->reg_pull = NULL; pc->reg_pullen = meson_map_resource(pc, gpio_np, "pull-enable"); if (IS_ERR(pc->reg_pullen)) pc->reg_pullen = NULL; pc->reg_ds = meson_map_resource(pc, gpio_np, "ds"); if (IS_ERR(pc->reg_ds)) { dev_dbg(pc->dev, "ds registers not found - skipping\n"); pc->reg_ds = NULL; } if (pc->data->parse_dt) return pc->data->parse_dt(pc); return 0; } int meson8_aobus_parse_dt_extra(struct meson_pinctrl *pc) { if (!pc->reg_pull) return -EINVAL; pc->reg_pullen = pc->reg_pull; return 0; } EXPORT_SYMBOL_GPL(meson8_aobus_parse_dt_extra); int meson_a1_parse_dt_extra(struct meson_pinctrl *pc) { pc->reg_pull = pc->reg_gpio; pc->reg_pullen = pc->reg_gpio; pc->reg_ds = pc->reg_gpio; return 0; } EXPORT_SYMBOL_GPL(meson_a1_parse_dt_extra); int meson_pinctrl_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct meson_pinctrl *pc; int ret; pc = devm_kzalloc(dev, sizeof(struct meson_pinctrl), GFP_KERNEL); if (!pc) return -ENOMEM; pc->dev = dev; pc->data = (struct meson_pinctrl_data *) of_device_get_match_data(dev); ret = meson_pinctrl_parse_dt(pc); if (ret) return ret; pc->desc.name = "pinctrl-meson"; pc->desc.owner = THIS_MODULE; pc->desc.pctlops = &meson_pctrl_ops; pc->desc.pmxops = pc->data->pmx_ops; pc->desc.confops = &meson_pinconf_ops; pc->desc.pins = pc->data->pins; pc->desc.npins = pc->data->num_pins; pc->pcdev = devm_pinctrl_register(pc->dev, &pc->desc, pc); if (IS_ERR(pc->pcdev)) { dev_err(pc->dev, "can't register pinctrl device"); return PTR_ERR(pc->pcdev); } return meson_gpiolib_register(pc); } EXPORT_SYMBOL_GPL(meson_pinctrl_probe); MODULE_DESCRIPTION("Amlogic Meson SoCs core pinctrl driver"); MODULE_LICENSE("GPL v2");