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u-boot/drivers/power/regulator/bd71837.c
Matti Vaittinen 21b02414f1 regulator: bd718x7: support ROHM BD71837 and BD71847 PMICs 
BD71837 and BD71847 is PMIC intended for powering single-core,
dual-core, and quad-core SoC’s such as NXP-i.MX 8M. BD71847
is used for example on NXP imx8mm EVK.

Add regulator driver for ROHM BD71837 and BD71847 PMICs.
BD71837 contains 8 bucks and 7 LDOS. BD71847 is reduced
version containing 6 bucks and 6 LDOs. Voltages for DVS
bucks (1-4 on BD71837, 1 and 2 on BD71847) can be adjusted
when regulators are enabled. For other bucks and LDOs we may
have over- or undershooting if voltage is adjusted when
regulator is enabled. Thus this is prevented by default.

BD718x7 has a quirk which may leave power output disabled
after reset if enable/disable state was controlled by SW.
Thus the SW control is only allowed for BD71837  bucks
3 and 4 by default. The impact of this limitation must be
evaluated board-by board and restrictions may need to be
modified. (Linux driver get's these limitations from DT and we
may want to implement same on u-Boot driver).

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2019-07-19 15:18:47 +02:00

468 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 ROHM Semiconductors
*
* ROHM BD71837 regulator driver
*/
#include <common.h>
#include <dm.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_platdata - 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_platdata {
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_platdata 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_platdata 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_platdata *plat = dev_get_platdata(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_platdata *plat = dev_get_platdata(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_platdata *plat = dev_get_platdata(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_platdata *plat = dev_get_platdata(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_platdata *plat = dev_get_platdata(dev);
int i, ret;
struct dm_regulator_uclass_platdata *uc_pdata;
int type;
struct bd71837_platdata *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_platdata(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,
.platdata_auto_alloc_size = sizeof(struct bd71837_platdata),
};
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