| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2019 ROHM Semiconductors |
| * |
| * ROHM BD71837 regulator driver |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <log.h> |
| #include <linux/bitops.h> |
| #include <power/bd71837.h> |
| #include <power/pmic.h> |
| #include <power/regulator.h> |
| |
| #define HW_STATE_CONTROL 0 |
| #define DEBUG |
| |
| /** |
| * struct bd71837_vrange - describe linear range of voltages |
| * |
| * @min_volt: smallest voltage in range |
| * @step: how much voltage changes at each selector step |
| * @min_sel: smallest selector in the range |
| * @max_sel: maximum selector in the range |
| * @rangeval: register value used to select this range if selectible |
| * ranges are supported |
| */ |
| struct bd71837_vrange { |
| unsigned int min_volt; |
| unsigned int step; |
| u8 min_sel; |
| u8 max_sel; |
| u8 rangeval; |
| }; |
| |
| /** |
| * struct bd71837_plat - describe regulator control registers |
| * |
| * @name: name of the regulator. Used for matching the dt-entry |
| * @enable_reg: register address used to enable/disable regulator |
| * @enablemask: register mask used to enable/disable regulator |
| * @volt_reg: register address used to configure regulator voltage |
| * @volt_mask: register mask used to configure regulator voltage |
| * @ranges: pointer to ranges of regulator voltages and matching register |
| * values |
| * @numranges: number of voltage ranges pointed by ranges |
| * @rangemask: mask for selecting used ranges if multiple ranges are supported |
| * @sel_mask: bit to toggle in order to transfer the register control to SW |
| * @dvs: whether the voltage can be changed when regulator is enabled |
| */ |
| struct bd71837_plat { |
| const char *name; |
| u8 enable_reg; |
| u8 enablemask; |
| u8 volt_reg; |
| u8 volt_mask; |
| struct bd71837_vrange *ranges; |
| unsigned int numranges; |
| u8 rangemask; |
| u8 sel_mask; |
| bool dvs; |
| }; |
| |
| #define BD_RANGE(_min, _vstep, _sel_low, _sel_hi, _range_sel) \ |
| { \ |
| .min_volt = (_min), .step = (_vstep), .min_sel = (_sel_low), \ |
| .max_sel = (_sel_hi), .rangeval = (_range_sel) \ |
| } |
| |
| #define BD_DATA(_name, enreg, enmask, vreg, vmask, _range, rmask, _dvs, sel) \ |
| { \ |
| .name = (_name), .enable_reg = (enreg), .enablemask = (enmask), \ |
| .volt_reg = (vreg), .volt_mask = (vmask), .ranges = (_range), \ |
| .numranges = ARRAY_SIZE(_range), .rangemask = (rmask), .dvs = (_dvs), \ |
| .sel_mask = (sel) \ |
| } |
| |
| static struct bd71837_vrange dvs_buck_vranges[] = { |
| BD_RANGE(700000, 10000, 0, 0x3c, 0), |
| BD_RANGE(1300000, 0, 0x3d, 0x3f, 0), |
| }; |
| |
| static struct bd71837_vrange bd71847_buck3_vranges[] = { |
| BD_RANGE(700000, 100000, 0x00, 0x03, 0), |
| BD_RANGE(1050000, 50000, 0x04, 0x05, 0), |
| BD_RANGE(1200000, 150000, 0x06, 0x07, 0), |
| BD_RANGE(550000, 50000, 0x0, 0x7, 0x40), |
| BD_RANGE(675000, 100000, 0x0, 0x3, 0x80), |
| BD_RANGE(1025000, 50000, 0x4, 0x5, 0x80), |
| BD_RANGE(1175000, 150000, 0x6, 0x7, 0x80), |
| }; |
| |
| static struct bd71837_vrange bd71847_buck4_vranges[] = { |
| BD_RANGE(3000000, 100000, 0x00, 0x03, 0), |
| BD_RANGE(2600000, 100000, 0x00, 0x03, 40), |
| }; |
| |
| static struct bd71837_vrange bd71837_buck5_vranges[] = { |
| BD_RANGE(700000, 100000, 0, 0x3, 0), |
| BD_RANGE(1050000, 50000, 0x04, 0x05, 0), |
| BD_RANGE(1200000, 150000, 0x06, 0x07, 0), |
| BD_RANGE(675000, 100000, 0x0, 0x3, 0x80), |
| BD_RANGE(1025000, 50000, 0x04, 0x05, 0x80), |
| BD_RANGE(1175000, 150000, 0x06, 0x07, 0x80), |
| }; |
| |
| static struct bd71837_vrange bd71837_buck6_vranges[] = { |
| BD_RANGE(3000000, 100000, 0x00, 0x03, 0), |
| }; |
| |
| static struct bd71837_vrange nodvs_buck3_vranges[] = { |
| BD_RANGE(1605000, 90000, 0, 1, 0), |
| BD_RANGE(1755000, 45000, 2, 4, 0), |
| BD_RANGE(1905000, 45000, 5, 7, 0), |
| }; |
| |
| static struct bd71837_vrange nodvs_buck4_vranges[] = { |
| BD_RANGE(800000, 10000, 0x00, 0x3C, 0), |
| }; |
| |
| static struct bd71837_vrange ldo1_vranges[] = { |
| BD_RANGE(3000000, 100000, 0x00, 0x03, 0), |
| BD_RANGE(1600000, 100000, 0x00, 0x03, 0x20), |
| }; |
| |
| static struct bd71837_vrange ldo2_vranges[] = { |
| BD_RANGE(900000, 0, 0, 0, 0), |
| BD_RANGE(800000, 0, 1, 1, 0), |
| }; |
| |
| static struct bd71837_vrange ldo3_vranges[] = { |
| BD_RANGE(1800000, 100000, 0x00, 0x0f, 0), |
| }; |
| |
| static struct bd71837_vrange ldo4_vranges[] = { |
| BD_RANGE(900000, 100000, 0x00, 0x09, 0), |
| }; |
| |
| static struct bd71837_vrange bd71837_ldo5_vranges[] = { |
| BD_RANGE(1800000, 100000, 0x00, 0x0f, 0), |
| }; |
| |
| static struct bd71837_vrange bd71847_ldo5_vranges[] = { |
| BD_RANGE(1800000, 100000, 0x00, 0x0f, 0), |
| BD_RANGE(800000, 100000, 0x00, 0x0f, 0x20), |
| }; |
| |
| static struct bd71837_vrange ldo6_vranges[] = { |
| BD_RANGE(900000, 100000, 0x00, 0x09, 0), |
| }; |
| |
| static struct bd71837_vrange ldo7_vranges[] = { |
| BD_RANGE(1800000, 100000, 0x00, 0x0f, 0), |
| }; |
| |
| /* |
| * We use enable mask 'HW_STATE_CONTROL' to indicate that this regulator |
| * must not be enabled or disabled by SW. The typical use-case for BD71837 |
| * is powering NXP i.MX8. In this use-case we (for now) only allow control |
| * for BUCK3 and BUCK4 which are not boot critical. |
| */ |
| static struct bd71837_plat bd71837_reg_data[] = { |
| /* Bucks 1-4 which support dynamic voltage scaling */ |
| BD_DATA("BUCK1", BD718XX_BUCK1_CTRL, HW_STATE_CONTROL, |
| BD718XX_BUCK1_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK2", BD718XX_BUCK2_CTRL, HW_STATE_CONTROL, |
| BD718XX_BUCK2_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK3", BD71837_BUCK3_CTRL, BD718XX_BUCK_EN, |
| BD71837_BUCK3_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK4", BD71837_BUCK4_CTRL, BD718XX_BUCK_EN, |
| BD71837_BUCK4_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| /* Bucks 5-8 which do not support dynamic voltage scaling */ |
| BD_DATA("BUCK5", BD718XX_1ST_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_1ST_NODVS_BUCK_VOLT, BD718XX_1ST_NODVS_BUCK_MASK, |
| bd71837_buck5_vranges, 0x80, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK6", BD718XX_2ND_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_2ND_NODVS_BUCK_VOLT, BD71837_BUCK6_MASK, |
| bd71837_buck6_vranges, 0, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK7", BD718XX_3RD_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_3RD_NODVS_BUCK_VOLT, BD718XX_3RD_NODVS_BUCK_MASK, |
| nodvs_buck3_vranges, 0, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK8", BD718XX_4TH_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_4TH_NODVS_BUCK_VOLT, BD718XX_4TH_NODVS_BUCK_MASK, |
| nodvs_buck4_vranges, 0, false, BD718XX_BUCK_SEL), |
| /* LDOs */ |
| BD_DATA("LDO1", BD718XX_LDO1_VOLT, HW_STATE_CONTROL, BD718XX_LDO1_VOLT, |
| BD718XX_LDO1_MASK, ldo1_vranges, 0x20, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO2", BD718XX_LDO2_VOLT, HW_STATE_CONTROL, BD718XX_LDO2_VOLT, |
| BD718XX_LDO2_MASK, ldo2_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO3", BD718XX_LDO3_VOLT, HW_STATE_CONTROL, BD718XX_LDO3_VOLT, |
| BD718XX_LDO3_MASK, ldo3_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO4", BD718XX_LDO4_VOLT, HW_STATE_CONTROL, BD718XX_LDO4_VOLT, |
| BD718XX_LDO4_MASK, ldo4_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO5", BD718XX_LDO5_VOLT, HW_STATE_CONTROL, BD718XX_LDO5_VOLT, |
| BD71837_LDO5_MASK, bd71837_ldo5_vranges, 0, false, |
| BD718XX_LDO_SEL), |
| BD_DATA("LDO6", BD718XX_LDO6_VOLT, HW_STATE_CONTROL, BD718XX_LDO6_VOLT, |
| BD718XX_LDO6_MASK, ldo6_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO7", BD71837_LDO7_VOLT, HW_STATE_CONTROL, BD71837_LDO7_VOLT, |
| BD71837_LDO7_MASK, ldo7_vranges, 0, false, BD718XX_LDO_SEL), |
| }; |
| |
| static struct bd71837_plat bd71847_reg_data[] = { |
| /* Bucks 1 and 2 which support dynamic voltage scaling */ |
| BD_DATA("BUCK1", BD718XX_BUCK1_CTRL, HW_STATE_CONTROL, |
| BD718XX_BUCK1_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK2", BD718XX_BUCK2_CTRL, HW_STATE_CONTROL, |
| BD718XX_BUCK2_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0, |
| true, BD718XX_BUCK_SEL), |
| /* Bucks 3-6 which do not support dynamic voltage scaling */ |
| BD_DATA("BUCK3", BD718XX_1ST_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_1ST_NODVS_BUCK_VOLT, BD718XX_1ST_NODVS_BUCK_MASK, |
| bd71847_buck3_vranges, 0xc0, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK4", BD718XX_2ND_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_2ND_NODVS_BUCK_VOLT, BD71837_BUCK6_MASK, |
| bd71847_buck4_vranges, 0x40, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK5", BD718XX_3RD_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_3RD_NODVS_BUCK_VOLT, BD718XX_3RD_NODVS_BUCK_MASK, |
| nodvs_buck3_vranges, 0, false, BD718XX_BUCK_SEL), |
| BD_DATA("BUCK6", BD718XX_4TH_NODVS_BUCK_CTRL, HW_STATE_CONTROL, |
| BD718XX_4TH_NODVS_BUCK_VOLT, BD718XX_4TH_NODVS_BUCK_MASK, |
| nodvs_buck4_vranges, 0, false, BD718XX_BUCK_SEL), |
| /* LDOs */ |
| BD_DATA("LDO1", BD718XX_LDO1_VOLT, HW_STATE_CONTROL, BD718XX_LDO1_VOLT, |
| BD718XX_LDO1_MASK, ldo1_vranges, 0x20, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO2", BD718XX_LDO2_VOLT, HW_STATE_CONTROL, BD718XX_LDO2_VOLT, |
| BD718XX_LDO2_MASK, ldo2_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO3", BD718XX_LDO3_VOLT, HW_STATE_CONTROL, BD718XX_LDO3_VOLT, |
| BD718XX_LDO3_MASK, ldo3_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO4", BD718XX_LDO4_VOLT, HW_STATE_CONTROL, BD718XX_LDO4_VOLT, |
| BD718XX_LDO4_MASK, ldo4_vranges, 0, false, BD718XX_LDO_SEL), |
| BD_DATA("LDO5", BD718XX_LDO5_VOLT, HW_STATE_CONTROL, BD718XX_LDO5_VOLT, |
| BD71847_LDO5_MASK, bd71847_ldo5_vranges, 0x20, false, |
| BD718XX_LDO_SEL), |
| BD_DATA("LDO6", BD718XX_LDO6_VOLT, HW_STATE_CONTROL, BD718XX_LDO6_VOLT, |
| BD718XX_LDO6_MASK, ldo6_vranges, 0, false, BD718XX_LDO_SEL), |
| }; |
| |
| static int vrange_find_value(struct bd71837_vrange *r, unsigned int sel, |
| unsigned int *val) |
| { |
| if (!val || sel < r->min_sel || sel > r->max_sel) |
| return -EINVAL; |
| |
| *val = r->min_volt + r->step * (sel - r->min_sel); |
| return 0; |
| } |
| |
| static int vrange_find_selector(struct bd71837_vrange *r, int val, |
| unsigned int *sel) |
| { |
| int ret = -EINVAL; |
| int num_vals = r->max_sel - r->min_sel + 1; |
| |
| if (val >= r->min_volt && |
| val <= r->min_volt + r->step * (num_vals - 1)) { |
| if (r->step) { |
| *sel = r->min_sel + ((val - r->min_volt) / r->step); |
| ret = 0; |
| } else { |
| *sel = r->min_sel; |
| ret = 0; |
| } |
| } |
| return ret; |
| } |
| |
| static int bd71837_get_enable(struct udevice *dev) |
| { |
| int val; |
| struct bd71837_plat *plat = dev_get_plat(dev); |
| |
| /* |
| * boot critical regulators on bd71837 must not be controlled by sw |
| * due to the 'feature' which leaves power rails down if bd71837 is |
| * reseted to snvs state. hence we can't get the state here. |
| * |
| * if we are alive it means we probably are on run state and |
| * if the regulator can't be controlled we can assume it is |
| * enabled. |
| */ |
| if (plat->enablemask == HW_STATE_CONTROL) |
| return 1; |
| |
| val = pmic_reg_read(dev->parent, plat->enable_reg); |
| if (val < 0) |
| return val; |
| |
| return (val & plat->enablemask); |
| } |
| |
| static int bd71837_set_enable(struct udevice *dev, bool enable) |
| { |
| int val = 0; |
| struct bd71837_plat *plat = dev_get_plat(dev); |
| |
| /* |
| * boot critical regulators on bd71837 must not be controlled by sw |
| * due to the 'feature' which leaves power rails down if bd71837 is |
| * reseted to snvs state. Hence we can't set the state here. |
| */ |
| if (plat->enablemask == HW_STATE_CONTROL) |
| return -EINVAL; |
| |
| if (enable) |
| val = plat->enablemask; |
| |
| return pmic_clrsetbits(dev->parent, plat->enable_reg, plat->enablemask, |
| val); |
| } |
| |
| static int bd71837_set_value(struct udevice *dev, int uvolt) |
| { |
| unsigned int sel; |
| unsigned int range; |
| int i; |
| int found = 0; |
| struct bd71837_plat *plat = dev_get_plat(dev); |
| |
| /* |
| * An under/overshooting may occur if voltage is changed for other |
| * regulators but buck 1,2,3 or 4 when regulator is enabled. Prevent |
| * change to protect the HW |
| */ |
| if (!plat->dvs) |
| if (bd71837_get_enable(dev)) { |
| pr_err("Only DVS bucks can be changed when enabled\n"); |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < plat->numranges; i++) { |
| struct bd71837_vrange *r = &plat->ranges[i]; |
| |
| found = !vrange_find_selector(r, uvolt, &sel); |
| if (found) { |
| unsigned int tmp; |
| |
| /* |
| * We require exactly the requested value to be |
| * supported - this can be changed later if needed |
| */ |
| range = r->rangeval; |
| found = !vrange_find_value(r, sel, &tmp); |
| if (found && tmp == uvolt) |
| break; |
| found = 0; |
| } |
| } |
| |
| if (!found) |
| return -EINVAL; |
| |
| sel <<= ffs(plat->volt_mask) - 1; |
| |
| if (plat->rangemask) |
| sel |= range; |
| |
| return pmic_clrsetbits(dev->parent, plat->volt_reg, plat->volt_mask | |
| plat->rangemask, sel); |
| } |
| |
| static int bd71837_get_value(struct udevice *dev) |
| { |
| unsigned int reg, range; |
| unsigned int tmp; |
| struct bd71837_plat *plat = dev_get_plat(dev); |
| int i; |
| |
| reg = pmic_reg_read(dev->parent, plat->volt_reg); |
| if (((int)reg) < 0) |
| return reg; |
| |
| range = reg & plat->rangemask; |
| |
| reg &= plat->volt_mask; |
| reg >>= ffs(plat->volt_mask) - 1; |
| |
| for (i = 0; i < plat->numranges; i++) { |
| struct bd71837_vrange *r = &plat->ranges[i]; |
| |
| if (plat->rangemask && ((plat->rangemask & range) != |
| r->rangeval)) |
| continue; |
| |
| if (!vrange_find_value(r, reg, &tmp)) |
| return tmp; |
| } |
| |
| pr_err("Unknown voltage value read from pmic\n"); |
| |
| return -EINVAL; |
| } |
| |
| static int bd71837_regulator_probe(struct udevice *dev) |
| { |
| struct bd71837_plat *plat = dev_get_plat(dev); |
| int i, ret; |
| struct dm_regulator_uclass_plat *uc_pdata; |
| int type; |
| struct bd71837_plat *init_data; |
| int data_amnt; |
| |
| type = dev_get_driver_data(dev_get_parent(dev)); |
| |
| switch (type) { |
| case ROHM_CHIP_TYPE_BD71837: |
| init_data = bd71837_reg_data; |
| data_amnt = ARRAY_SIZE(bd71837_reg_data); |
| break; |
| case ROHM_CHIP_TYPE_BD71847: |
| init_data = bd71847_reg_data; |
| data_amnt = ARRAY_SIZE(bd71847_reg_data); |
| break; |
| default: |
| debug("Unknown PMIC type\n"); |
| init_data = NULL; |
| data_amnt = 0; |
| break; |
| } |
| |
| for (i = 0; i < data_amnt; i++) { |
| if (!strcmp(dev->name, init_data[i].name)) { |
| *plat = init_data[i]; |
| if (plat->enablemask != HW_STATE_CONTROL) { |
| /* |
| * Take the regulator under SW control. Ensure |
| * the initial state matches dt flags and then |
| * write the SEL bit |
| */ |
| uc_pdata = dev_get_uclass_plat(dev); |
| ret = bd71837_set_enable(dev, |
| !!(uc_pdata->boot_on || |
| uc_pdata->always_on)); |
| if (ret) |
| return ret; |
| |
| return pmic_clrsetbits(dev->parent, |
| plat->enable_reg, |
| plat->sel_mask, |
| plat->sel_mask); |
| } |
| return 0; |
| } |
| } |
| |
| pr_err("Unknown regulator '%s'\n", dev->name); |
| |
| return -ENOENT; |
| } |
| |
| static const struct dm_regulator_ops bd71837_regulator_ops = { |
| .get_value = bd71837_get_value, |
| .set_value = bd71837_set_value, |
| .get_enable = bd71837_get_enable, |
| .set_enable = bd71837_set_enable, |
| }; |
| |
| U_BOOT_DRIVER(bd71837_regulator) = { |
| .name = BD718XX_REGULATOR_DRIVER, |
| .id = UCLASS_REGULATOR, |
| .ops = &bd71837_regulator_ops, |
| .probe = bd71837_regulator_probe, |
| .plat_auto = sizeof(struct bd71837_plat), |
| }; |