/* * Regulator driver for Rockchip RK808 * * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd * * Author: Chris Zhong * Author: Zhang Qing * * 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. * * This program is distributed in the hope 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 /* Field Definitions */ #define RK808_BUCK_VSEL_MASK 0x3f #define RK808_BUCK4_VSEL_MASK 0xf #define RK808_LDO_VSEL_MASK 0x1f /* Ramp rate definitions for buck1 / buck2 only */ #define RK808_RAMP_RATE_OFFSET 3 #define RK808_RAMP_RATE_MASK (3 << RK808_RAMP_RATE_OFFSET) #define RK808_RAMP_RATE_2MV_PER_US (0 << RK808_RAMP_RATE_OFFSET) #define RK808_RAMP_RATE_4MV_PER_US (1 << RK808_RAMP_RATE_OFFSET) #define RK808_RAMP_RATE_6MV_PER_US (2 << RK808_RAMP_RATE_OFFSET) #define RK808_RAMP_RATE_10MV_PER_US (3 << RK808_RAMP_RATE_OFFSET) #define RK808_DVS2_POL BIT(2) #define RK808_DVS1_POL BIT(1) /* Offset from XXX_ON_VSEL to XXX_SLP_VSEL */ #define RK808_SLP_REG_OFFSET 1 /* Offset from XXX_ON_VSEL to XXX_DVS_VSEL */ #define RK808_DVS_REG_OFFSET 2 /* Offset from XXX_EN_REG to SLEEP_SET_OFF_XXX */ #define RK808_SLP_SET_OFF_REG_OFFSET 2 /* max steps for increase voltage of Buck1/2, equal 100mv*/ #define MAX_STEPS_ONE_TIME 8 struct rk808_regulator_data { struct gpio_desc *dvs_gpio[2]; }; static const int rk808_buck_config_regs[] = { RK808_BUCK1_CONFIG_REG, RK808_BUCK2_CONFIG_REG, RK808_BUCK3_CONFIG_REG, RK808_BUCK4_CONFIG_REG, }; static const struct regulator_linear_range rk808_buck_voltage_ranges[] = { REGULATOR_LINEAR_RANGE(712500, 0, 63, 12500), }; static const struct regulator_linear_range rk808_buck4_voltage_ranges[] = { REGULATOR_LINEAR_RANGE(1800000, 0, 15, 100000), }; static const struct regulator_linear_range rk808_ldo_voltage_ranges[] = { REGULATOR_LINEAR_RANGE(1800000, 0, 16, 100000), }; static const struct regulator_linear_range rk808_ldo3_voltage_ranges[] = { REGULATOR_LINEAR_RANGE(800000, 0, 13, 100000), REGULATOR_LINEAR_RANGE(2500000, 15, 15, 0), }; static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = { REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000), }; static int rk808_buck1_2_get_voltage_sel_regmap(struct regulator_dev *rdev) { struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev); int id = rdev->desc->id - RK808_ID_DCDC1; struct gpio_desc *gpio = pdata->dvs_gpio[id]; unsigned int val; int ret; if (!gpio || gpiod_get_value(gpio) == 0) return regulator_get_voltage_sel_regmap(rdev); ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg + RK808_DVS_REG_OFFSET, &val); if (ret != 0) return ret; val &= rdev->desc->vsel_mask; val >>= ffs(rdev->desc->vsel_mask) - 1; return val; } static int rk808_buck1_2_i2c_set_voltage_sel(struct regulator_dev *rdev, unsigned sel) { int ret, delta_sel; unsigned int old_sel, tmp, val, mask = rdev->desc->vsel_mask; ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); if (ret != 0) return ret; tmp = val & ~mask; old_sel = val & mask; old_sel >>= ffs(mask) - 1; delta_sel = sel - old_sel; /* * If directly modify the register to change the voltage, we will face * the risk of overshoot. Put it into a multi-step, can effectively * avoid this problem, a step is 100mv here. */ while (delta_sel > MAX_STEPS_ONE_TIME) { old_sel += MAX_STEPS_ONE_TIME; val = old_sel << (ffs(mask) - 1); val |= tmp; /* * i2c is 400kHz (2.5us per bit) and we must transmit _at least_ * 3 bytes (24 bits) plus start and stop so 26 bits. So we've * got more than 65 us between each voltage change and thus * won't ramp faster than ~1500 uV / us. */ ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val); delta_sel = sel - old_sel; } sel <<= ffs(mask) - 1; val = tmp | sel; ret = regmap_write(rdev->regmap, rdev->desc->vsel_reg, val); /* * When we change the voltage register directly, the ramp rate is about * 100000uv/us, wait 1us to make sure the target voltage to be stable, * so we needn't wait extra time after that. */ udelay(1); return ret; } static int rk808_buck1_2_set_voltage_sel(struct regulator_dev *rdev, unsigned sel) { struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev); int id = rdev->desc->id - RK808_ID_DCDC1; struct gpio_desc *gpio = pdata->dvs_gpio[id]; unsigned int reg = rdev->desc->vsel_reg; unsigned old_sel; int ret, gpio_level; if (!gpio) return rk808_buck1_2_i2c_set_voltage_sel(rdev, sel); gpio_level = gpiod_get_value(gpio); if (gpio_level == 0) { reg += RK808_DVS_REG_OFFSET; ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &old_sel); } else { ret = regmap_read(rdev->regmap, reg + RK808_DVS_REG_OFFSET, &old_sel); } if (ret != 0) return ret; sel <<= ffs(rdev->desc->vsel_mask) - 1; sel |= old_sel & ~rdev->desc->vsel_mask; ret = regmap_write(rdev->regmap, reg, sel); if (ret) return ret; gpiod_set_value(gpio, !gpio_level); return ret; } static int rk808_buck1_2_set_voltage_time_sel(struct regulator_dev *rdev, unsigned int old_selector, unsigned int new_selector) { struct rk808_regulator_data *pdata = rdev_get_drvdata(rdev); int id = rdev->desc->id - RK808_ID_DCDC1; struct gpio_desc *gpio = pdata->dvs_gpio[id]; /* if there is no dvs1/2 pin, we don't need wait extra time here. */ if (!gpio) return 0; return regulator_set_voltage_time_sel(rdev, old_selector, new_selector); } static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) { unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US; unsigned int reg = rk808_buck_config_regs[rdev->desc->id - RK808_ID_DCDC1]; switch (ramp_delay) { case 1 ... 2000: ramp_value = RK808_RAMP_RATE_2MV_PER_US; break; case 2001 ... 4000: ramp_value = RK808_RAMP_RATE_4MV_PER_US; break; case 4001 ... 6000: ramp_value = RK808_RAMP_RATE_6MV_PER_US; break; case 6001 ... 10000: break; default: pr_warn("%s ramp_delay: %d not supported, setting 10000\n", rdev->desc->name, ramp_delay); } return regmap_update_bits(rdev->regmap, reg, RK808_RAMP_RATE_MASK, ramp_value); } static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv) { unsigned int reg; int sel = regulator_map_voltage_linear_range(rdev, uv, uv); if (sel < 0) return -EINVAL; reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET; return regmap_update_bits(rdev->regmap, reg, rdev->desc->vsel_mask, sel); } static int rk808_set_suspend_enable(struct regulator_dev *rdev) { unsigned int reg; reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET; return regmap_update_bits(rdev->regmap, reg, rdev->desc->enable_mask, 0); } static int rk808_set_suspend_disable(struct regulator_dev *rdev) { unsigned int reg; reg = rdev->desc->enable_reg + RK808_SLP_SET_OFF_REG_OFFSET; return regmap_update_bits(rdev->regmap, reg, rdev->desc->enable_mask, rdev->desc->enable_mask); } static struct regulator_ops rk808_buck1_2_ops = { .list_voltage = regulator_list_voltage_linear_range, .map_voltage = regulator_map_voltage_linear_range, .get_voltage_sel = rk808_buck1_2_get_voltage_sel_regmap, .set_voltage_sel = rk808_buck1_2_set_voltage_sel, .set_voltage_time_sel = rk808_buck1_2_set_voltage_time_sel, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .set_ramp_delay = rk808_set_ramp_delay, .set_suspend_voltage = rk808_set_suspend_voltage, .set_suspend_enable = rk808_set_suspend_enable, .set_suspend_disable = rk808_set_suspend_disable, }; static struct regulator_ops rk808_reg_ops = { .list_voltage = regulator_list_voltage_linear_range, .map_voltage = regulator_map_voltage_linear_range, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .set_suspend_voltage = rk808_set_suspend_voltage, .set_suspend_enable = rk808_set_suspend_enable, .set_suspend_disable = rk808_set_suspend_disable, }; static struct regulator_ops rk808_switch_ops = { .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .set_suspend_enable = rk808_set_suspend_enable, .set_suspend_disable = rk808_set_suspend_disable, }; static const struct regulator_desc rk808_reg[] = { { .name = "DCDC_REG1", .supply_name = "vcc1", .id = RK808_ID_DCDC1, .ops = &rk808_buck1_2_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 64, .linear_ranges = rk808_buck_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges), .vsel_reg = RK808_BUCK1_ON_VSEL_REG, .vsel_mask = RK808_BUCK_VSEL_MASK, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(0), .owner = THIS_MODULE, }, { .name = "DCDC_REG2", .supply_name = "vcc2", .id = RK808_ID_DCDC2, .ops = &rk808_buck1_2_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 64, .linear_ranges = rk808_buck_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_buck_voltage_ranges), .vsel_reg = RK808_BUCK2_ON_VSEL_REG, .vsel_mask = RK808_BUCK_VSEL_MASK, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(1), .owner = THIS_MODULE, }, { .name = "DCDC_REG3", .supply_name = "vcc3", .id = RK808_ID_DCDC3, .ops = &rk808_switch_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 1, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(2), .owner = THIS_MODULE, }, { .name = "DCDC_REG4", .supply_name = "vcc4", .id = RK808_ID_DCDC4, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 16, .linear_ranges = rk808_buck4_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_buck4_voltage_ranges), .vsel_reg = RK808_BUCK4_ON_VSEL_REG, .vsel_mask = RK808_BUCK4_VSEL_MASK, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(3), .owner = THIS_MODULE, }, { .name = "LDO_REG1", .supply_name = "vcc6", .id = RK808_ID_LDO1, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 17, .linear_ranges = rk808_ldo_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges), .vsel_reg = RK808_LDO1_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(0), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG2", .supply_name = "vcc6", .id = RK808_ID_LDO2, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 17, .linear_ranges = rk808_ldo_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges), .vsel_reg = RK808_LDO2_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(1), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG3", .supply_name = "vcc7", .id = RK808_ID_LDO3, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 16, .linear_ranges = rk808_ldo3_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo3_voltage_ranges), .vsel_reg = RK808_LDO3_ON_VSEL_REG, .vsel_mask = RK808_BUCK4_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(2), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG4", .supply_name = "vcc9", .id = RK808_ID_LDO4, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 17, .linear_ranges = rk808_ldo_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges), .vsel_reg = RK808_LDO4_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(3), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG5", .supply_name = "vcc9", .id = RK808_ID_LDO5, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 17, .linear_ranges = rk808_ldo_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges), .vsel_reg = RK808_LDO5_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(4), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG6", .supply_name = "vcc10", .id = RK808_ID_LDO6, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 18, .linear_ranges = rk808_ldo6_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges), .vsel_reg = RK808_LDO6_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(5), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG7", .supply_name = "vcc7", .id = RK808_ID_LDO7, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 18, .linear_ranges = rk808_ldo6_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo6_voltage_ranges), .vsel_reg = RK808_LDO7_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(6), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "LDO_REG8", .supply_name = "vcc11", .id = RK808_ID_LDO8, .ops = &rk808_reg_ops, .type = REGULATOR_VOLTAGE, .n_voltages = 17, .linear_ranges = rk808_ldo_voltage_ranges, .n_linear_ranges = ARRAY_SIZE(rk808_ldo_voltage_ranges), .vsel_reg = RK808_LDO8_ON_VSEL_REG, .vsel_mask = RK808_LDO_VSEL_MASK, .enable_reg = RK808_LDO_EN_REG, .enable_mask = BIT(7), .enable_time = 400, .owner = THIS_MODULE, }, { .name = "SWITCH_REG1", .supply_name = "vcc8", .id = RK808_ID_SWITCH1, .ops = &rk808_switch_ops, .type = REGULATOR_VOLTAGE, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(5), .owner = THIS_MODULE, }, { .name = "SWITCH_REG2", .supply_name = "vcc12", .id = RK808_ID_SWITCH2, .ops = &rk808_switch_ops, .type = REGULATOR_VOLTAGE, .enable_reg = RK808_DCDC_EN_REG, .enable_mask = BIT(6), .owner = THIS_MODULE, }, }; static struct of_regulator_match rk808_reg_matches[] = { [RK808_ID_DCDC1] = { .name = "DCDC_REG1" }, [RK808_ID_DCDC2] = { .name = "DCDC_REG2" }, [RK808_ID_DCDC3] = { .name = "DCDC_REG3" }, [RK808_ID_DCDC4] = { .name = "DCDC_REG4" }, [RK808_ID_LDO1] = { .name = "LDO_REG1" }, [RK808_ID_LDO2] = { .name = "LDO_REG2" }, [RK808_ID_LDO3] = { .name = "LDO_REG3" }, [RK808_ID_LDO4] = { .name = "LDO_REG4" }, [RK808_ID_LDO5] = { .name = "LDO_REG5" }, [RK808_ID_LDO6] = { .name = "LDO_REG6" }, [RK808_ID_LDO7] = { .name = "LDO_REG7" }, [RK808_ID_LDO8] = { .name = "LDO_REG8" }, [RK808_ID_SWITCH1] = { .name = "SWITCH_REG1" }, [RK808_ID_SWITCH2] = { .name = "SWITCH_REG2" }, }; static int rk808_regulator_dt_parse_pdata(struct device *dev, struct device *client_dev, struct regmap *map, struct rk808_regulator_data *pdata) { struct device_node *np; int tmp, ret, i; np = of_get_child_by_name(client_dev->of_node, "regulators"); if (!np) return -ENXIO; ret = of_regulator_match(dev, np, rk808_reg_matches, RK808_NUM_REGULATORS); if (ret < 0) goto dt_parse_end; for (i = 0; i < ARRAY_SIZE(pdata->dvs_gpio); i++) { pdata->dvs_gpio[i] = devm_gpiod_get_index_optional(client_dev, "dvs", i, GPIOD_OUT_LOW); if (IS_ERR(pdata->dvs_gpio[i])) { ret = PTR_ERR(pdata->dvs_gpio[i]); dev_err(dev, "failed to get dvs%d gpio (%d)\n", i, ret); goto dt_parse_end; } if (!pdata->dvs_gpio[i]) { dev_warn(dev, "there is no dvs%d gpio\n", i); continue; } tmp = i ? RK808_DVS2_POL : RK808_DVS1_POL; ret = regmap_update_bits(map, RK808_IO_POL_REG, tmp, gpiod_is_active_low(pdata->dvs_gpio[i]) ? 0 : tmp); } dt_parse_end: of_node_put(np); return ret; } static int rk808_regulator_probe(struct platform_device *pdev) { struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); struct i2c_client *client = rk808->i2c; struct regulator_config config = {}; struct regulator_dev *rk808_rdev; struct rk808_regulator_data *pdata; int ret, i; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; ret = rk808_regulator_dt_parse_pdata(&pdev->dev, &client->dev, rk808->regmap, pdata); if (ret < 0) return ret; platform_set_drvdata(pdev, pdata); /* Instantiate the regulators */ for (i = 0; i < RK808_NUM_REGULATORS; i++) { if (!rk808_reg_matches[i].init_data || !rk808_reg_matches[i].of_node) continue; config.dev = &client->dev; config.driver_data = pdata; config.regmap = rk808->regmap; config.of_node = rk808_reg_matches[i].of_node; config.init_data = rk808_reg_matches[i].init_data; rk808_rdev = devm_regulator_register(&pdev->dev, &rk808_reg[i], &config); if (IS_ERR(rk808_rdev)) { dev_err(&client->dev, "failed to register %d regulator\n", i); return PTR_ERR(rk808_rdev); } } return 0; } static struct platform_driver rk808_regulator_driver = { .probe = rk808_regulator_probe, .driver = { .name = "rk808-regulator", .owner = THIS_MODULE, }, }; module_platform_driver(rk808_regulator_driver); MODULE_DESCRIPTION("regulator driver for the rk808 series PMICs"); MODULE_AUTHOR("Chris Zhong"); MODULE_AUTHOR("Zhang Qing"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:rk808-regulator");