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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
471 lines
14 KiB
C
471 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 ROHM Semiconductors
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*
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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/bd71837.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 bd71837_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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* @rangeval: register value used to select this range if selectible
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* ranges are supported
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*/
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struct bd71837_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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u8 rangeval;
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};
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/**
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* struct bd71837_platdata - 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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* @rangemask: mask for selecting used ranges if multiple ranges are supported
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* @sel_mask: bit to toggle in order to transfer the register control to SW
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* @dvs: whether the voltage can be changed when regulator is enabled
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*/
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struct bd71837_platdata {
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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 bd71837_vrange *ranges;
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unsigned int numranges;
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u8 rangemask;
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u8 sel_mask;
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bool dvs;
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};
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#define BD_RANGE(_min, _vstep, _sel_low, _sel_hi, _range_sel) \
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{ \
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.min_volt = (_min), .step = (_vstep), .min_sel = (_sel_low), \
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.max_sel = (_sel_hi), .rangeval = (_range_sel) \
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}
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#define BD_DATA(_name, enreg, enmask, vreg, vmask, _range, rmask, _dvs, sel) \
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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), .rangemask = (rmask), .dvs = (_dvs), \
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.sel_mask = (sel) \
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}
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static struct bd71837_vrange dvs_buck_vranges[] = {
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BD_RANGE(700000, 10000, 0, 0x3c, 0),
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BD_RANGE(1300000, 0, 0x3d, 0x3f, 0),
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};
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static struct bd71837_vrange bd71847_buck3_vranges[] = {
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BD_RANGE(700000, 100000, 0x00, 0x03, 0),
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BD_RANGE(1050000, 50000, 0x04, 0x05, 0),
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BD_RANGE(1200000, 150000, 0x06, 0x07, 0),
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BD_RANGE(550000, 50000, 0x0, 0x7, 0x40),
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BD_RANGE(675000, 100000, 0x0, 0x3, 0x80),
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BD_RANGE(1025000, 50000, 0x4, 0x5, 0x80),
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BD_RANGE(1175000, 150000, 0x6, 0x7, 0x80),
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};
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static struct bd71837_vrange bd71847_buck4_vranges[] = {
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BD_RANGE(3000000, 100000, 0x00, 0x03, 0),
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BD_RANGE(2600000, 100000, 0x00, 0x03, 40),
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};
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static struct bd71837_vrange bd71837_buck5_vranges[] = {
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BD_RANGE(700000, 100000, 0, 0x3, 0),
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BD_RANGE(1050000, 50000, 0x04, 0x05, 0),
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BD_RANGE(1200000, 150000, 0x06, 0x07, 0),
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BD_RANGE(675000, 100000, 0x0, 0x3, 0x80),
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BD_RANGE(1025000, 50000, 0x04, 0x05, 0x80),
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BD_RANGE(1175000, 150000, 0x06, 0x07, 0x80),
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};
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static struct bd71837_vrange bd71837_buck6_vranges[] = {
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BD_RANGE(3000000, 100000, 0x00, 0x03, 0),
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};
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static struct bd71837_vrange nodvs_buck3_vranges[] = {
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BD_RANGE(1605000, 90000, 0, 1, 0),
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BD_RANGE(1755000, 45000, 2, 4, 0),
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BD_RANGE(1905000, 45000, 5, 7, 0),
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};
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static struct bd71837_vrange nodvs_buck4_vranges[] = {
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BD_RANGE(800000, 10000, 0x00, 0x3C, 0),
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};
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static struct bd71837_vrange ldo1_vranges[] = {
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BD_RANGE(3000000, 100000, 0x00, 0x03, 0),
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BD_RANGE(1600000, 100000, 0x00, 0x03, 0x20),
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};
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static struct bd71837_vrange ldo2_vranges[] = {
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BD_RANGE(900000, 0, 0, 0, 0),
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BD_RANGE(800000, 0, 1, 1, 0),
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};
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static struct bd71837_vrange ldo3_vranges[] = {
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BD_RANGE(1800000, 100000, 0x00, 0x0f, 0),
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};
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static struct bd71837_vrange ldo4_vranges[] = {
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BD_RANGE(900000, 100000, 0x00, 0x09, 0),
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};
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static struct bd71837_vrange bd71837_ldo5_vranges[] = {
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BD_RANGE(1800000, 100000, 0x00, 0x0f, 0),
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};
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static struct bd71837_vrange bd71847_ldo5_vranges[] = {
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BD_RANGE(1800000, 100000, 0x00, 0x0f, 0),
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BD_RANGE(800000, 100000, 0x00, 0x0f, 0x20),
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};
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static struct bd71837_vrange ldo6_vranges[] = {
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BD_RANGE(900000, 100000, 0x00, 0x09, 0),
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};
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static struct bd71837_vrange ldo7_vranges[] = {
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BD_RANGE(1800000, 100000, 0x00, 0x0f, 0),
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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 BD71837
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* is powering NXP i.MX8. In this use-case we (for now) only allow control
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* for BUCK3 and BUCK4 which are not boot critical.
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*/
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static struct bd71837_platdata bd71837_reg_data[] = {
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/* Bucks 1-4 which support dynamic voltage scaling */
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BD_DATA("BUCK1", BD718XX_BUCK1_CTRL, HW_STATE_CONTROL,
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BD718XX_BUCK1_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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BD_DATA("BUCK2", BD718XX_BUCK2_CTRL, HW_STATE_CONTROL,
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BD718XX_BUCK2_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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BD_DATA("BUCK3", BD71837_BUCK3_CTRL, BD718XX_BUCK_EN,
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BD71837_BUCK3_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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BD_DATA("BUCK4", BD71837_BUCK4_CTRL, BD718XX_BUCK_EN,
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BD71837_BUCK4_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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/* Bucks 5-8 which do not support dynamic voltage scaling */
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BD_DATA("BUCK5", BD718XX_1ST_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_1ST_NODVS_BUCK_VOLT, BD718XX_1ST_NODVS_BUCK_MASK,
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bd71837_buck5_vranges, 0x80, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK6", BD718XX_2ND_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_2ND_NODVS_BUCK_VOLT, BD71837_BUCK6_MASK,
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bd71837_buck6_vranges, 0, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK7", BD718XX_3RD_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_3RD_NODVS_BUCK_VOLT, BD718XX_3RD_NODVS_BUCK_MASK,
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nodvs_buck3_vranges, 0, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK8", BD718XX_4TH_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_4TH_NODVS_BUCK_VOLT, BD718XX_4TH_NODVS_BUCK_MASK,
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nodvs_buck4_vranges, 0, false, BD718XX_BUCK_SEL),
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/* LDOs */
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BD_DATA("LDO1", BD718XX_LDO1_VOLT, HW_STATE_CONTROL, BD718XX_LDO1_VOLT,
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BD718XX_LDO1_MASK, ldo1_vranges, 0x20, false, BD718XX_LDO_SEL),
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BD_DATA("LDO2", BD718XX_LDO2_VOLT, HW_STATE_CONTROL, BD718XX_LDO2_VOLT,
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BD718XX_LDO2_MASK, ldo2_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO3", BD718XX_LDO3_VOLT, HW_STATE_CONTROL, BD718XX_LDO3_VOLT,
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BD718XX_LDO3_MASK, ldo3_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO4", BD718XX_LDO4_VOLT, HW_STATE_CONTROL, BD718XX_LDO4_VOLT,
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BD718XX_LDO4_MASK, ldo4_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO5", BD718XX_LDO5_VOLT, HW_STATE_CONTROL, BD718XX_LDO5_VOLT,
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BD71837_LDO5_MASK, bd71837_ldo5_vranges, 0, false,
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BD718XX_LDO_SEL),
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BD_DATA("LDO6", BD718XX_LDO6_VOLT, HW_STATE_CONTROL, BD718XX_LDO6_VOLT,
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BD718XX_LDO6_MASK, ldo6_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO7", BD71837_LDO7_VOLT, HW_STATE_CONTROL, BD71837_LDO7_VOLT,
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BD71837_LDO7_MASK, ldo7_vranges, 0, false, BD718XX_LDO_SEL),
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};
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static struct bd71837_platdata bd71847_reg_data[] = {
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/* Bucks 1 and 2 which support dynamic voltage scaling */
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BD_DATA("BUCK1", BD718XX_BUCK1_CTRL, HW_STATE_CONTROL,
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BD718XX_BUCK1_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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BD_DATA("BUCK2", BD718XX_BUCK2_CTRL, HW_STATE_CONTROL,
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BD718XX_BUCK2_VOLT_RUN, DVS_BUCK_RUN_MASK, dvs_buck_vranges, 0,
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true, BD718XX_BUCK_SEL),
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/* Bucks 3-6 which do not support dynamic voltage scaling */
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BD_DATA("BUCK3", BD718XX_1ST_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_1ST_NODVS_BUCK_VOLT, BD718XX_1ST_NODVS_BUCK_MASK,
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bd71847_buck3_vranges, 0xc0, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK4", BD718XX_2ND_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_2ND_NODVS_BUCK_VOLT, BD71837_BUCK6_MASK,
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bd71847_buck4_vranges, 0x40, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK5", BD718XX_3RD_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_3RD_NODVS_BUCK_VOLT, BD718XX_3RD_NODVS_BUCK_MASK,
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nodvs_buck3_vranges, 0, false, BD718XX_BUCK_SEL),
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BD_DATA("BUCK6", BD718XX_4TH_NODVS_BUCK_CTRL, HW_STATE_CONTROL,
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BD718XX_4TH_NODVS_BUCK_VOLT, BD718XX_4TH_NODVS_BUCK_MASK,
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nodvs_buck4_vranges, 0, false, BD718XX_BUCK_SEL),
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/* LDOs */
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BD_DATA("LDO1", BD718XX_LDO1_VOLT, HW_STATE_CONTROL, BD718XX_LDO1_VOLT,
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BD718XX_LDO1_MASK, ldo1_vranges, 0x20, false, BD718XX_LDO_SEL),
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BD_DATA("LDO2", BD718XX_LDO2_VOLT, HW_STATE_CONTROL, BD718XX_LDO2_VOLT,
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BD718XX_LDO2_MASK, ldo2_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO3", BD718XX_LDO3_VOLT, HW_STATE_CONTROL, BD718XX_LDO3_VOLT,
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BD718XX_LDO3_MASK, ldo3_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO4", BD718XX_LDO4_VOLT, HW_STATE_CONTROL, BD718XX_LDO4_VOLT,
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BD718XX_LDO4_MASK, ldo4_vranges, 0, false, BD718XX_LDO_SEL),
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BD_DATA("LDO5", BD718XX_LDO5_VOLT, HW_STATE_CONTROL, BD718XX_LDO5_VOLT,
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BD71847_LDO5_MASK, bd71847_ldo5_vranges, 0x20, false,
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BD718XX_LDO_SEL),
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BD_DATA("LDO6", BD718XX_LDO6_VOLT, HW_STATE_CONTROL, BD718XX_LDO6_VOLT,
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BD718XX_LDO6_MASK, ldo6_vranges, 0, false, BD718XX_LDO_SEL),
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};
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static int vrange_find_value(struct bd71837_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 bd71837_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 bd71837_get_enable(struct udevice *dev)
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{
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int val;
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struct bd71837_platdata *plat = dev_get_platdata(dev);
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/*
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* boot critical regulators on bd71837 must not be controlled by sw
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* due to the 'feature' which leaves power rails down if bd71837 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 bd71837_set_enable(struct udevice *dev, bool enable)
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{
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int val = 0;
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struct bd71837_platdata *plat = dev_get_platdata(dev);
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/*
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* boot critical regulators on bd71837 must not be controlled by sw
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* due to the 'feature' which leaves power rails down if bd71837 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 -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 bd71837_set_value(struct udevice *dev, int uvolt)
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{
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unsigned int sel;
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unsigned int range;
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int i;
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int found = 0;
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struct bd71837_platdata *plat = dev_get_platdata(dev);
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/*
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* An under/overshooting may occur if voltage is changed for other
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* regulators but buck 1,2,3 or 4 when regulator is enabled. Prevent
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* change to protect the HW
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*/
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if (!plat->dvs)
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if (bd71837_get_enable(dev)) {
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pr_err("Only DVS bucks can be changed when enabled\n");
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return -EINVAL;
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}
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for (i = 0; i < plat->numranges; i++) {
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struct bd71837_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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range = r->rangeval;
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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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sel <<= ffs(plat->volt_mask) - 1;
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if (plat->rangemask)
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sel |= range;
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return pmic_clrsetbits(dev->parent, plat->volt_reg, plat->volt_mask |
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plat->rangemask, sel);
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}
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static int bd71837_get_value(struct udevice *dev)
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{
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unsigned int reg, range;
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unsigned int tmp;
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struct bd71837_platdata *plat = dev_get_platdata(dev);
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int i;
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reg = pmic_reg_read(dev->parent, plat->volt_reg);
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if (((int)reg) < 0)
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return reg;
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range = reg & plat->rangemask;
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reg &= plat->volt_mask;
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reg >>= ffs(plat->volt_mask) - 1;
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for (i = 0; i < plat->numranges; i++) {
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struct bd71837_vrange *r = &plat->ranges[i];
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if (plat->rangemask && ((plat->rangemask & range) !=
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r->rangeval))
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continue;
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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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}
|
|
|
|
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 = sizeof(struct bd71837_platdata),
|
|
};
|