![Mark Brown](/assets/img/avatar_default.png)
Change the interface used by set_voltage() to report the selected value to the regulator core in terms of a selector used by list_voltage(). This allows the regulator core to know the voltage that was chosen without having to do an explict get_voltage(), which would be much more expensive as it will generally access hardware. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
691 lines
16 KiB
C
691 lines
16 KiB
C
/*
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* drivers/regulator/ab3100.c
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*
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* Copyright (C) 2008-2009 ST-Ericsson AB
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* License terms: GNU General Public License (GPL) version 2
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* Low-level control of the AB3100 IC Low Dropout (LDO)
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* regulators, external regulator and buck converter
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* Author: Mattias Wallin <mattias.wallin@stericsson.com>
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/abx500.h>
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/* LDO registers and some handy masking definitions for AB3100 */
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#define AB3100_LDO_A 0x40
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#define AB3100_LDO_C 0x41
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#define AB3100_LDO_D 0x42
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#define AB3100_LDO_E 0x43
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#define AB3100_LDO_E_SLEEP 0x44
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#define AB3100_LDO_F 0x45
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#define AB3100_LDO_G 0x46
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#define AB3100_LDO_H 0x47
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#define AB3100_LDO_H_SLEEP_MODE 0
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#define AB3100_LDO_H_SLEEP_EN 2
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#define AB3100_LDO_ON 4
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#define AB3100_LDO_H_VSEL_AC 5
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#define AB3100_LDO_K 0x48
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#define AB3100_LDO_EXT 0x49
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#define AB3100_BUCK 0x4A
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#define AB3100_BUCK_SLEEP 0x4B
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#define AB3100_REG_ON_MASK 0x10
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/**
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* struct ab3100_regulator
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* A struct passed around the individual regulator functions
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* @platform_device: platform device holding this regulator
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* @dev: handle to the device
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* @plfdata: AB3100 platform data passed in at probe time
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* @regreg: regulator register number in the AB3100
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* @fixed_voltage: a fixed voltage for this regulator, if this
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* 0 the voltages array is used instead.
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* @typ_voltages: an array of available typical voltages for
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* this regulator
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* @voltages_len: length of the array of available voltages
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*/
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struct ab3100_regulator {
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struct regulator_dev *rdev;
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struct device *dev;
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struct ab3100_platform_data *plfdata;
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u8 regreg;
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int fixed_voltage;
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int const *typ_voltages;
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u8 voltages_len;
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};
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/* The order in which registers are initialized */
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static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
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AB3100_LDO_A,
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AB3100_LDO_C,
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AB3100_LDO_E,
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AB3100_LDO_E_SLEEP,
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AB3100_LDO_F,
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AB3100_LDO_G,
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AB3100_LDO_H,
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AB3100_LDO_K,
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AB3100_LDO_EXT,
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AB3100_BUCK,
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AB3100_BUCK_SLEEP,
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AB3100_LDO_D,
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};
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/* Preset (hardware defined) voltages for these regulators */
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#define LDO_A_VOLTAGE 2750000
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#define LDO_C_VOLTAGE 2650000
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#define LDO_D_VOLTAGE 2650000
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static const int ldo_e_buck_typ_voltages[] = {
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1800000,
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1400000,
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1300000,
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1200000,
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1100000,
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1050000,
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900000,
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};
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static const int ldo_f_typ_voltages[] = {
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1800000,
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1400000,
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1300000,
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1200000,
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1100000,
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1050000,
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2500000,
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2650000,
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};
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static const int ldo_g_typ_voltages[] = {
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2850000,
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2750000,
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1800000,
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1500000,
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};
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static const int ldo_h_typ_voltages[] = {
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2750000,
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1800000,
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1500000,
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1200000,
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};
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static const int ldo_k_typ_voltages[] = {
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2750000,
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1800000,
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};
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/* The regulator devices */
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static struct ab3100_regulator
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ab3100_regulators[AB3100_NUM_REGULATORS] = {
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{
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.regreg = AB3100_LDO_A,
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.fixed_voltage = LDO_A_VOLTAGE,
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},
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{
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.regreg = AB3100_LDO_C,
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.fixed_voltage = LDO_C_VOLTAGE,
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},
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{
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.regreg = AB3100_LDO_D,
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.fixed_voltage = LDO_D_VOLTAGE,
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},
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{
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.regreg = AB3100_LDO_E,
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.typ_voltages = ldo_e_buck_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
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},
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{
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.regreg = AB3100_LDO_F,
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.typ_voltages = ldo_f_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_f_typ_voltages),
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},
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{
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.regreg = AB3100_LDO_G,
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.typ_voltages = ldo_g_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_g_typ_voltages),
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},
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{
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.regreg = AB3100_LDO_H,
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.typ_voltages = ldo_h_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_h_typ_voltages),
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},
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{
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.regreg = AB3100_LDO_K,
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.typ_voltages = ldo_k_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_k_typ_voltages),
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},
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{
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.regreg = AB3100_LDO_EXT,
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/* No voltages for the external regulator */
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},
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{
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.regreg = AB3100_BUCK,
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.typ_voltages = ldo_e_buck_typ_voltages,
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.voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages),
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},
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};
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/*
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* General functions for enable, disable and is_enabled used for
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* LDO: A,C,E,F,G,H,K,EXT and BUCK
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*/
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static int ab3100_enable_regulator(struct regulator_dev *reg)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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int err;
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u8 regval;
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err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
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®val);
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if (err) {
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dev_warn(®->dev, "failed to get regid %d value\n",
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abreg->regreg);
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return err;
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}
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/* The regulator is already on, no reason to go further */
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if (regval & AB3100_REG_ON_MASK)
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return 0;
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regval |= AB3100_REG_ON_MASK;
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err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
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regval);
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if (err) {
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dev_warn(®->dev, "failed to set regid %d value\n",
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abreg->regreg);
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return err;
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}
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/* Per-regulator power on delay from spec */
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switch (abreg->regreg) {
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case AB3100_LDO_A: /* Fallthrough */
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case AB3100_LDO_C: /* Fallthrough */
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case AB3100_LDO_D: /* Fallthrough */
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case AB3100_LDO_E: /* Fallthrough */
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case AB3100_LDO_H: /* Fallthrough */
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case AB3100_LDO_K:
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udelay(200);
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break;
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case AB3100_LDO_F:
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udelay(600);
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break;
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case AB3100_LDO_G:
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udelay(400);
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break;
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case AB3100_BUCK:
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mdelay(1);
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break;
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default:
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break;
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}
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return 0;
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}
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static int ab3100_disable_regulator(struct regulator_dev *reg)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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int err;
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u8 regval;
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/*
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* LDO D is a special regulator. When it is disabled, the entire
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* system is shut down. So this is handled specially.
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*/
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pr_info("Called ab3100_disable_regulator\n");
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if (abreg->regreg == AB3100_LDO_D) {
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dev_info(®->dev, "disabling LDO D - shut down system\n");
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/* Setting LDO D to 0x00 cuts the power to the SoC */
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return abx500_set_register_interruptible(abreg->dev, 0,
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AB3100_LDO_D, 0x00U);
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}
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/*
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* All other regulators are handled here
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*/
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err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
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®val);
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if (err) {
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dev_err(®->dev, "unable to get register 0x%x\n",
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abreg->regreg);
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return err;
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}
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regval &= ~AB3100_REG_ON_MASK;
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return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
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regval);
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}
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static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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u8 regval;
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int err;
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err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
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®val);
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if (err) {
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dev_err(®->dev, "unable to get register 0x%x\n",
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abreg->regreg);
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return err;
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}
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return regval & AB3100_REG_ON_MASK;
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}
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static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
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unsigned selector)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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if (selector >= abreg->voltages_len)
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return -EINVAL;
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return abreg->typ_voltages[selector];
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}
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static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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u8 regval;
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int err;
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/* Return the voltage for fixed regulators immediately */
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if (abreg->fixed_voltage)
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return abreg->fixed_voltage;
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/*
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* For variable types, read out setting and index into
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* supplied voltage list.
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*/
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err = abx500_get_register_interruptible(abreg->dev, 0,
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abreg->regreg, ®val);
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if (err) {
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dev_warn(®->dev,
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"failed to get regulator value in register %02x\n",
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abreg->regreg);
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return err;
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}
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/* The 3 highest bits index voltages */
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regval &= 0xE0;
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regval >>= 5;
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if (regval >= abreg->voltages_len) {
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dev_err(®->dev,
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"regulator register %02x contains an illegal voltage setting\n",
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abreg->regreg);
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return -EINVAL;
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}
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return abreg->typ_voltages[regval];
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}
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static int ab3100_get_best_voltage_index(struct regulator_dev *reg,
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int min_uV, int max_uV)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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int i;
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int bestmatch;
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int bestindex;
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/*
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* Locate the minimum voltage fitting the criteria on
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* this regulator. The switchable voltages are not
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* in strict falling order so we need to check them
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* all for the best match.
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*/
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bestmatch = INT_MAX;
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bestindex = -1;
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for (i = 0; i < abreg->voltages_len; i++) {
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if (abreg->typ_voltages[i] <= max_uV &&
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abreg->typ_voltages[i] >= min_uV &&
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abreg->typ_voltages[i] < bestmatch) {
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bestmatch = abreg->typ_voltages[i];
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bestindex = i;
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}
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}
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if (bestindex < 0) {
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dev_warn(®->dev, "requested %d<=x<=%d uV, out of range!\n",
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min_uV, max_uV);
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return -EINVAL;
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}
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return bestindex;
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}
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static int ab3100_set_voltage_regulator(struct regulator_dev *reg,
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int min_uV, int max_uV,
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unsigned *selector)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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u8 regval;
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int err;
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int bestindex;
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bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV);
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if (bestindex < 0)
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return bestindex;
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*selector = bestindex;
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err = abx500_get_register_interruptible(abreg->dev, 0,
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abreg->regreg, ®val);
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if (err) {
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dev_warn(®->dev,
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"failed to get regulator register %02x\n",
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abreg->regreg);
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return err;
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}
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/* The highest three bits control the variable regulators */
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regval &= ~0xE0;
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regval |= (bestindex << 5);
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err = abx500_set_register_interruptible(abreg->dev, 0,
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abreg->regreg, regval);
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if (err)
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dev_warn(®->dev, "failed to set regulator register %02x\n",
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abreg->regreg);
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return err;
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}
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static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
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int uV)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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u8 regval;
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int err;
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int bestindex;
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u8 targetreg;
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if (abreg->regreg == AB3100_LDO_E)
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targetreg = AB3100_LDO_E_SLEEP;
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else if (abreg->regreg == AB3100_BUCK)
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targetreg = AB3100_BUCK_SLEEP;
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else
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return -EINVAL;
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/* LDO E and BUCK have special suspend voltages you can set */
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bestindex = ab3100_get_best_voltage_index(reg, uV, uV);
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err = abx500_get_register_interruptible(abreg->dev, 0,
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targetreg, ®val);
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if (err) {
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dev_warn(®->dev,
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"failed to get regulator register %02x\n",
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targetreg);
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return err;
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}
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/* The highest three bits control the variable regulators */
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regval &= ~0xE0;
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regval |= (bestindex << 5);
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err = abx500_set_register_interruptible(abreg->dev, 0,
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targetreg, regval);
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if (err)
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dev_warn(®->dev, "failed to set regulator register %02x\n",
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abreg->regreg);
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return err;
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}
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/*
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* The external regulator can just define a fixed voltage.
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*/
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static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
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{
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struct ab3100_regulator *abreg = reg->reg_data;
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return abreg->plfdata->external_voltage;
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}
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static struct regulator_ops regulator_ops_fixed = {
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.enable = ab3100_enable_regulator,
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.disable = ab3100_disable_regulator,
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.is_enabled = ab3100_is_enabled_regulator,
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.get_voltage = ab3100_get_voltage_regulator,
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};
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static struct regulator_ops regulator_ops_variable = {
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.enable = ab3100_enable_regulator,
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.disable = ab3100_disable_regulator,
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.is_enabled = ab3100_is_enabled_regulator,
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.get_voltage = ab3100_get_voltage_regulator,
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.set_voltage = ab3100_set_voltage_regulator,
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.list_voltage = ab3100_list_voltage_regulator,
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};
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static struct regulator_ops regulator_ops_variable_sleepable = {
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.enable = ab3100_enable_regulator,
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.disable = ab3100_disable_regulator,
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.is_enabled = ab3100_is_enabled_regulator,
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.get_voltage = ab3100_get_voltage_regulator,
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.set_voltage = ab3100_set_voltage_regulator,
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.set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
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.list_voltage = ab3100_list_voltage_regulator,
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};
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/*
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* LDO EXT is an external regulator so it is really
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* not possible to set any voltage locally here, AB3100
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* is an on/off switch plain an simple. The external
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* voltage is defined in the board set-up if any.
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*/
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static struct regulator_ops regulator_ops_external = {
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.enable = ab3100_enable_regulator,
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.disable = ab3100_disable_regulator,
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.is_enabled = ab3100_is_enabled_regulator,
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.get_voltage = ab3100_get_voltage_regulator_external,
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};
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static struct regulator_desc
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ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
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{
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.name = "LDO_A",
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.id = AB3100_LDO_A,
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.ops = ®ulator_ops_fixed,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO_C",
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.id = AB3100_LDO_C,
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.ops = ®ulator_ops_fixed,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO_D",
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.id = AB3100_LDO_D,
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.ops = ®ulator_ops_fixed,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_E",
|
|
.id = AB3100_LDO_E,
|
|
.ops = ®ulator_ops_variable_sleepable,
|
|
.n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_F",
|
|
.id = AB3100_LDO_F,
|
|
.ops = ®ulator_ops_variable,
|
|
.n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_G",
|
|
.id = AB3100_LDO_G,
|
|
.ops = ®ulator_ops_variable,
|
|
.n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_H",
|
|
.id = AB3100_LDO_H,
|
|
.ops = ®ulator_ops_variable,
|
|
.n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_K",
|
|
.id = AB3100_LDO_K,
|
|
.ops = ®ulator_ops_variable,
|
|
.n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "LDO_EXT",
|
|
.id = AB3100_LDO_EXT,
|
|
.ops = ®ulator_ops_external,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "BUCK",
|
|
.id = AB3100_BUCK,
|
|
.ops = ®ulator_ops_variable_sleepable,
|
|
.n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
|
|
.type = REGULATOR_VOLTAGE,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* NOTE: the following functions are regulators pluralis - it is the
|
|
* binding to the AB3100 core driver and the parent platform device
|
|
* for all the different regulators.
|
|
*/
|
|
|
|
static int __devinit ab3100_regulators_probe(struct platform_device *pdev)
|
|
{
|
|
struct ab3100_platform_data *plfdata = pdev->dev.platform_data;
|
|
int err = 0;
|
|
u8 data;
|
|
int i;
|
|
|
|
/* Check chip state */
|
|
err = abx500_get_register_interruptible(&pdev->dev, 0,
|
|
AB3100_LDO_D, &data);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
|
|
return err;
|
|
}
|
|
if (data & 0x10)
|
|
dev_notice(&pdev->dev,
|
|
"chip is already in active mode (Warm start)\n");
|
|
else
|
|
dev_notice(&pdev->dev,
|
|
"chip is in inactive mode (Cold start)\n");
|
|
|
|
/* Set up regulators */
|
|
for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
|
|
err = abx500_set_register_interruptible(&pdev->dev, 0,
|
|
ab3100_reg_init_order[i],
|
|
plfdata->reg_initvals[i]);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* Register the regulators */
|
|
for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
|
|
struct ab3100_regulator *reg = &ab3100_regulators[i];
|
|
struct regulator_dev *rdev;
|
|
|
|
/*
|
|
* Initialize per-regulator struct.
|
|
* Inherit platform data, this comes down from the
|
|
* i2c boarddata, from the machine. So if you want to
|
|
* see what it looks like for a certain machine, go
|
|
* into the machine I2C setup.
|
|
*/
|
|
reg->dev = &pdev->dev;
|
|
reg->plfdata = plfdata;
|
|
|
|
/*
|
|
* Register the regulator, pass around
|
|
* the ab3100_regulator struct
|
|
*/
|
|
rdev = regulator_register(&ab3100_regulator_desc[i],
|
|
&pdev->dev,
|
|
&plfdata->reg_constraints[i],
|
|
reg);
|
|
|
|
if (IS_ERR(rdev)) {
|
|
err = PTR_ERR(rdev);
|
|
dev_err(&pdev->dev,
|
|
"%s: failed to register regulator %s err %d\n",
|
|
__func__, ab3100_regulator_desc[i].name,
|
|
err);
|
|
/* remove the already registered regulators */
|
|
while (--i >= 0)
|
|
regulator_unregister(ab3100_regulators[i].rdev);
|
|
return err;
|
|
}
|
|
|
|
/* Then set a pointer back to the registered regulator */
|
|
reg->rdev = rdev;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit ab3100_regulators_remove(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
|
|
struct ab3100_regulator *reg = &ab3100_regulators[i];
|
|
|
|
regulator_unregister(reg->rdev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ab3100_regulators_driver = {
|
|
.driver = {
|
|
.name = "ab3100-regulators",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ab3100_regulators_probe,
|
|
.remove = __devexit_p(ab3100_regulators_remove),
|
|
};
|
|
|
|
static __init int ab3100_regulators_init(void)
|
|
{
|
|
return platform_driver_register(&ab3100_regulators_driver);
|
|
}
|
|
|
|
static __exit void ab3100_regulators_exit(void)
|
|
{
|
|
platform_driver_unregister(&ab3100_regulators_driver);
|
|
}
|
|
|
|
subsys_initcall(ab3100_regulators_init);
|
|
module_exit(ab3100_regulators_exit);
|
|
|
|
MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
|
|
MODULE_DESCRIPTION("AB3100 Regulator driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ab3100-regulators");
|