123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470 |
- // 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),
- };
|