318 lines
8.3 KiB
C
318 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* NXP PCA9450 regulator driver
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* Copyright (C) 2022 Marek Vasut <marex@denx.de>
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*
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* Largely based on:
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* ROHM BD71837 regulator driver
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <linux/bitops.h>
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#include <power/pca9450.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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#define HW_STATE_CONTROL 0
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#define DEBUG
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/**
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* struct pca9450_vrange - describe linear range of voltages
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*
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* @min_volt: smallest voltage in range
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* @step: how much voltage changes at each selector step
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* @min_sel: smallest selector in the range
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* @max_sel: maximum selector in the range
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*/
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struct pca9450_vrange {
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unsigned int min_volt;
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unsigned int step;
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u8 min_sel;
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u8 max_sel;
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};
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/**
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* struct pca9450_plat - describe regulator control registers
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*
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* @name: name of the regulator. Used for matching the dt-entry
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* @enable_reg: register address used to enable/disable regulator
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* @enablemask: register mask used to enable/disable regulator
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* @volt_reg: register address used to configure regulator voltage
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* @volt_mask: register mask used to configure regulator voltage
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* @ranges: pointer to ranges of regulator voltages and matching register
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* values
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* @numranges: number of voltage ranges pointed by ranges
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*/
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struct pca9450_plat {
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const char *name;
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u8 enable_reg;
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u8 enablemask;
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u8 volt_reg;
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u8 volt_mask;
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struct pca9450_vrange *ranges;
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unsigned int numranges;
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};
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#define PCA_RANGE(_min, _vstep, _sel_low, _sel_hi) \
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{ \
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.min_volt = (_min), .step = (_vstep), \
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.min_sel = (_sel_low), .max_sel = (_sel_hi), \
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}
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#define PCA_DATA(_name, enreg, enmask, vreg, vmask, _range) \
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{ \
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.name = (_name), .enable_reg = (enreg), .enablemask = (enmask), \
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.volt_reg = (vreg), .volt_mask = (vmask), .ranges = (_range), \
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.numranges = ARRAY_SIZE(_range) \
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}
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static struct pca9450_vrange pca9450_buck123_vranges[] = {
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PCA_RANGE(600000, 12500, 0, 0x7f),
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};
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static struct pca9450_vrange pca9450_buck456_vranges[] = {
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PCA_RANGE(600000, 25000, 0, 0x70),
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PCA_RANGE(3400000, 0, 0x71, 0x7f),
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};
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static struct pca9450_vrange pca9450_ldo1_vranges[] = {
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PCA_RANGE(1600000, 100000, 0x0, 0x3),
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PCA_RANGE(3000000, 100000, 0x4, 0x7),
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};
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static struct pca9450_vrange pca9450_ldo2_vranges[] = {
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PCA_RANGE(800000, 50000, 0x0, 0x7),
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};
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static struct pca9450_vrange pca9450_ldo34_vranges[] = {
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PCA_RANGE(800000, 100000, 0x0, 0x19),
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PCA_RANGE(3300000, 0, 0x1a, 0x1f),
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};
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static struct pca9450_vrange pca9450_ldo5_vranges[] = {
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PCA_RANGE(1800000, 100000, 0x0, 0xf),
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};
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/*
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* We use enable mask 'HW_STATE_CONTROL' to indicate that this regulator
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* must not be enabled or disabled by SW. The typical use-case for PCA9450
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* is powering NXP i.MX8. In this use-case we (for now) only allow control
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* for BUCK4, BUCK5, BUCK6 which are not boot critical.
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*/
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static struct pca9450_plat pca9450_reg_data[] = {
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/* Bucks 1-3 which support dynamic voltage scaling */
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PCA_DATA("BUCK1", PCA9450_BUCK1CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK1OUT_DVS0, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck123_vranges),
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PCA_DATA("BUCK2", PCA9450_BUCK2CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK2OUT_DVS0, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck123_vranges),
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PCA_DATA("BUCK3", PCA9450_BUCK3CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK3OUT_DVS0, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck123_vranges),
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/* Bucks 4-6 which do not support dynamic voltage scaling */
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PCA_DATA("BUCK4", PCA9450_BUCK4CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK4OUT, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck456_vranges),
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PCA_DATA("BUCK5", PCA9450_BUCK5CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK5OUT, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck456_vranges),
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PCA_DATA("BUCK6", PCA9450_BUCK6CTRL, HW_STATE_CONTROL,
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PCA9450_BUCK6OUT, PCA9450_DVS_BUCK_RUN_MASK,
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pca9450_buck456_vranges),
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/* LDOs */
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PCA_DATA("LDO1", PCA9450_LDO1CTRL, HW_STATE_CONTROL,
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PCA9450_LDO1CTRL, PCA9450_LDO12_MASK,
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pca9450_ldo1_vranges),
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PCA_DATA("LDO2", PCA9450_LDO2CTRL, HW_STATE_CONTROL,
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PCA9450_LDO2CTRL, PCA9450_LDO12_MASK,
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pca9450_ldo2_vranges),
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PCA_DATA("LDO3", PCA9450_LDO3CTRL, HW_STATE_CONTROL,
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PCA9450_LDO3CTRL, PCA9450_LDO34_MASK,
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pca9450_ldo34_vranges),
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PCA_DATA("LDO4", PCA9450_LDO4CTRL, HW_STATE_CONTROL,
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PCA9450_LDO4CTRL, PCA9450_LDO34_MASK,
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pca9450_ldo34_vranges),
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PCA_DATA("LDO5", PCA9450_LDO5CTRL_H, HW_STATE_CONTROL,
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PCA9450_LDO5CTRL_H, PCA9450_LDO5_MASK,
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pca9450_ldo5_vranges),
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};
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static int vrange_find_value(struct pca9450_vrange *r, unsigned int sel,
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unsigned int *val)
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{
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if (!val || sel < r->min_sel || sel > r->max_sel)
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return -EINVAL;
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*val = r->min_volt + r->step * (sel - r->min_sel);
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return 0;
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}
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static int vrange_find_selector(struct pca9450_vrange *r, int val,
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unsigned int *sel)
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{
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int ret = -EINVAL;
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int num_vals = r->max_sel - r->min_sel + 1;
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if (val >= r->min_volt &&
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val <= r->min_volt + r->step * (num_vals - 1)) {
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if (r->step) {
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*sel = r->min_sel + ((val - r->min_volt) / r->step);
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ret = 0;
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} else {
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*sel = r->min_sel;
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ret = 0;
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}
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}
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return ret;
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}
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static int pca9450_get_enable(struct udevice *dev)
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{
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struct pca9450_plat *plat = dev_get_plat(dev);
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int val;
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/*
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* boot critical regulators on pca9450 must not be controlled by sw
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* due to the 'feature' which leaves power rails down if pca9450 is
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* reseted to snvs state. hence we can't get the state here.
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*
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* if we are alive it means we probably are on run state and
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* if the regulator can't be controlled we can assume it is
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* enabled.
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*/
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if (plat->enablemask == HW_STATE_CONTROL)
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return 1;
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val = pmic_reg_read(dev->parent, plat->enable_reg);
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if (val < 0)
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return val;
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return (val & plat->enablemask);
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}
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static int pca9450_set_enable(struct udevice *dev, bool enable)
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{
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int val = 0;
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struct pca9450_plat *plat = dev_get_plat(dev);
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/*
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* boot critical regulators on pca9450 must not be controlled by sw
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* due to the 'feature' which leaves power rails down if pca9450 is
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* reseted to snvs state. Hence we can't set the state here.
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*/
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if (plat->enablemask == HW_STATE_CONTROL)
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return enable ? 0 : -EINVAL;
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if (enable)
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val = plat->enablemask;
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return pmic_clrsetbits(dev->parent, plat->enable_reg, plat->enablemask,
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val);
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}
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static int pca9450_get_value(struct udevice *dev)
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{
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struct pca9450_plat *plat = dev_get_plat(dev);
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unsigned int reg, tmp;
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int i, ret;
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ret = pmic_reg_read(dev->parent, plat->volt_reg);
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if (ret < 0)
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return ret;
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reg = ret;
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reg &= plat->volt_mask;
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for (i = 0; i < plat->numranges; i++) {
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struct pca9450_vrange *r = &plat->ranges[i];
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if (!vrange_find_value(r, reg, &tmp))
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return tmp;
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}
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pr_err("Unknown voltage value read from pmic\n");
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return -EINVAL;
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}
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static int pca9450_set_value(struct udevice *dev, int uvolt)
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{
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struct pca9450_plat *plat = dev_get_plat(dev);
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unsigned int sel;
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int i, found = 0;
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for (i = 0; i < plat->numranges; i++) {
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struct pca9450_vrange *r = &plat->ranges[i];
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found = !vrange_find_selector(r, uvolt, &sel);
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if (found) {
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unsigned int tmp;
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/*
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* We require exactly the requested value to be
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* supported - this can be changed later if needed
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*/
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found = !vrange_find_value(r, sel, &tmp);
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if (found && tmp == uvolt)
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break;
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found = 0;
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}
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}
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if (!found)
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return -EINVAL;
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return pmic_clrsetbits(dev->parent, plat->volt_reg,
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plat->volt_mask, sel);
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}
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static int pca9450_regulator_probe(struct udevice *dev)
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{
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struct pca9450_plat *plat = dev_get_plat(dev);
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int i, type;
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type = dev_get_driver_data(dev_get_parent(dev));
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if (type != NXP_CHIP_TYPE_PCA9450A && type != NXP_CHIP_TYPE_PCA9450BC) {
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debug("Unknown PMIC type\n");
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(pca9450_reg_data); i++) {
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if (strcmp(dev->name, pca9450_reg_data[i].name))
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continue;
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/* PCA9450B/PCA9450C uses BUCK1 and BUCK3 in dual-phase */
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if (type == NXP_CHIP_TYPE_PCA9450BC &&
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!strcmp(pca9450_reg_data[i].name, "BUCK3")) {
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continue;
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}
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*plat = pca9450_reg_data[i];
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return 0;
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}
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pr_err("Unknown regulator '%s'\n", dev->name);
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return -ENOENT;
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}
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static const struct dm_regulator_ops pca9450_regulator_ops = {
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.get_value = pca9450_get_value,
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.set_value = pca9450_set_value,
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.get_enable = pca9450_get_enable,
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.set_enable = pca9450_set_enable,
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};
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U_BOOT_DRIVER(pca9450_regulator) = {
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.name = PCA9450_REGULATOR_DRIVER,
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.id = UCLASS_REGULATOR,
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.ops = &pca9450_regulator_ops,
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.probe = pca9450_regulator_probe,
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.plat_auto = sizeof(struct pca9450_plat),
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};
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