602 lines
16 KiB
C
602 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// MCP16502 PMIC driver
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//
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// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
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//
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// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>
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//
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// Inspired from tps65086-regulator.c
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/suspend.h>
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#include <linux/gpio/consumer.h>
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#define VDD_LOW_SEL 0x0D
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#define VDD_HIGH_SEL 0x3F
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#define MCP16502_FLT BIT(7)
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#define MCP16502_DVSR GENMASK(3, 2)
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#define MCP16502_ENS BIT(0)
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/*
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* The PMIC has four sets of registers corresponding to four power modes:
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* Performance, Active, Low-power, Hibernate.
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*
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* Registers:
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* Each regulator has a register for each power mode. To access a register
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* for a specific regulator and mode BASE_* and OFFSET_* need to be added.
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*
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* Operating modes:
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* In order for the PMIC to transition to operating modes it has to be
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* controlled via GPIO lines called LPM and HPM.
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*
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* The registers are fully configurable such that you can put all regulators in
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* a low-power state while the PMIC is in Active mode. They are supposed to be
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* configured at startup and then simply transition to/from a global low-power
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* state by setting the GPIO lpm pin high/low.
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*
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* This driver keeps the PMIC in Active mode, Low-power state is set for the
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* regulators by enabling/disabling operating mode (FPWM or Auto PFM).
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*
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* The PMIC's Low-power and Hibernate modes are used during standby/suspend.
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* To enter standby/suspend the PMIC will go to Low-power mode. From there, it
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* will transition to Hibernate when the PWRHLD line is set to low by the MPU.
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*/
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/*
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* This function is useful for iterating over all regulators and accessing their
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* registers in a generic way or accessing a regulator device by its id.
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*/
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#define MCP16502_REG_BASE(i, r) ((((i) + 1) << 4) + MCP16502_REG_##r)
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#define MCP16502_STAT_BASE(i) ((i) + 5)
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#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
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#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
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#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY
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#define MCP16502_MODE_AUTO_PFM 0
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#define MCP16502_MODE_FPWM BIT(6)
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#define MCP16502_VSEL 0x3F
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#define MCP16502_EN BIT(7)
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#define MCP16502_MODE BIT(6)
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#define MCP16502_MIN_REG 0x0
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#define MCP16502_MAX_REG 0x65
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/**
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* enum mcp16502_reg - MCP16502 regulators's registers
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* @MCP16502_REG_A: active state register
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* @MCP16502_REG_LPM: low power mode state register
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* @MCP16502_REG_HIB: hibernate state register
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* @MCP16502_REG_SEQ: startup sequence register
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* @MCP16502_REG_CFG: configuration register
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*/
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enum mcp16502_reg {
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MCP16502_REG_A,
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MCP16502_REG_LPM,
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MCP16502_REG_HIB,
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MCP16502_REG_HPM,
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MCP16502_REG_SEQ,
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MCP16502_REG_CFG,
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};
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/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
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static const unsigned int mcp16502_ramp_b1l12[] = {
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6250, 3125, 2083, 1563
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};
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/* Ramp delay (uV/us) for buck2, buck3, buck4. */
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static const unsigned int mcp16502_ramp_b234[] = {
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3125, 1563, 1042, 781
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};
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static unsigned int mcp16502_of_map_mode(unsigned int mode)
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{
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if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
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return mode;
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return REGULATOR_MODE_INVALID;
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}
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#define MCP16502_REGULATOR(_name, _id, _ranges, _ops, _ramp_table) \
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[_id] = { \
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.name = _name, \
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.regulators_node = of_match_ptr("regulators"), \
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.id = _id, \
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.ops = &(_ops), \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.n_voltages = MCP16502_VSEL + 1, \
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.linear_ranges = _ranges, \
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.linear_min_sel = VDD_LOW_SEL, \
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.n_linear_ranges = ARRAY_SIZE(_ranges), \
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.of_match = of_match_ptr(_name), \
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.of_map_mode = mcp16502_of_map_mode, \
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.vsel_reg = (((_id) + 1) << 4), \
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.vsel_mask = MCP16502_VSEL, \
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.enable_reg = (((_id) + 1) << 4), \
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.enable_mask = MCP16502_EN, \
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.ramp_reg = MCP16502_REG_BASE(_id, CFG), \
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.ramp_mask = MCP16502_DVSR, \
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.ramp_delay_table = _ramp_table, \
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.n_ramp_values = ARRAY_SIZE(_ramp_table), \
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}
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enum {
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BUCK1 = 0,
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BUCK2,
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BUCK3,
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BUCK4,
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LDO1,
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LDO2,
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NUM_REGULATORS
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};
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/*
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* struct mcp16502 - PMIC representation
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* @lpm: LPM GPIO descriptor
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*/
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struct mcp16502 {
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struct gpio_desc *lpm;
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};
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/*
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* mcp16502_gpio_set_mode() - set the GPIO corresponding value
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*
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* Used to prepare transitioning into hibernate or resuming from it.
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*/
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static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)
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{
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switch (mode) {
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case MCP16502_OPMODE_ACTIVE:
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gpiod_set_value(mcp->lpm, 0);
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break;
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case MCP16502_OPMODE_LPM:
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case MCP16502_OPMODE_HIB:
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gpiod_set_value(mcp->lpm, 1);
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break;
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default:
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pr_err("%s: %d invalid\n", __func__, mode);
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}
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}
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/*
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* mcp16502_get_reg() - get the PMIC's state configuration register for opmode
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*
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* @rdev: the regulator whose register we are searching
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* @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
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*/
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static int mcp16502_get_state_reg(struct regulator_dev *rdev, int opmode)
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{
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switch (opmode) {
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case MCP16502_OPMODE_ACTIVE:
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return MCP16502_REG_BASE(rdev_get_id(rdev), A);
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case MCP16502_OPMODE_LPM:
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return MCP16502_REG_BASE(rdev_get_id(rdev), LPM);
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case MCP16502_OPMODE_HIB:
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return MCP16502_REG_BASE(rdev_get_id(rdev), HIB);
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default:
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return -EINVAL;
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}
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}
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/*
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* mcp16502_get_mode() - return the current operating mode of a regulator
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*
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* Note: all functions that are not part of entering/exiting standby/suspend
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* use the Active mode registers.
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*
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* Note: this is different from the PMIC's operatig mode, it is the
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* MODE bit from the regulator's register.
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*/
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static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)
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{
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unsigned int val;
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int ret, reg;
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reg = mcp16502_get_state_reg(rdev, MCP16502_OPMODE_ACTIVE);
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if (reg < 0)
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return reg;
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ret = regmap_read(rdev->regmap, reg, &val);
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if (ret)
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return ret;
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switch (val & MCP16502_MODE) {
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case MCP16502_MODE_FPWM:
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return REGULATOR_MODE_NORMAL;
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case MCP16502_MODE_AUTO_PFM:
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return REGULATOR_MODE_IDLE;
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default:
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return REGULATOR_MODE_INVALID;
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}
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}
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/*
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* _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
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*
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* @rdev: the regulator for which we are setting the mode
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* @mode: the regulator's mode (the one from MODE bit)
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* @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
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*/
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static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,
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unsigned int op_mode)
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{
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int val;
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int reg;
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reg = mcp16502_get_state_reg(rdev, op_mode);
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if (reg < 0)
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return reg;
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switch (mode) {
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case REGULATOR_MODE_NORMAL:
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val = MCP16502_MODE_FPWM;
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break;
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case REGULATOR_MODE_IDLE:
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val = MCP16502_MODE_AUTO_PFM;
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break;
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default:
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return -EINVAL;
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}
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reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val);
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return reg;
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}
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/*
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* mcp16502_set_mode() - regulator_ops set_mode
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*/
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static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);
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}
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/*
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* mcp16502_get_status() - regulator_ops get_status
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*/
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static int mcp16502_get_status(struct regulator_dev *rdev)
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{
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int ret;
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unsigned int val;
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ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),
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&val);
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if (ret)
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return ret;
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if (val & MCP16502_FLT)
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return REGULATOR_STATUS_ERROR;
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else if (val & MCP16502_ENS)
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return REGULATOR_STATUS_ON;
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else if (!(val & MCP16502_ENS))
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return REGULATOR_STATUS_OFF;
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return REGULATOR_STATUS_UNDEFINED;
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}
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static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
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unsigned int old_sel,
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unsigned int new_sel)
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{
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static const u8 us_ramp[] = { 8, 16, 24, 32 };
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int id = rdev_get_id(rdev);
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unsigned int uV_delta, val;
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int ret;
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ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
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if (ret)
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return ret;
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val = (val & MCP16502_DVSR) >> 2;
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uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
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old_sel * rdev->desc->linear_ranges->step);
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switch (id) {
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case BUCK1:
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case LDO1:
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case LDO2:
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ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
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mcp16502_ramp_b1l12[val]);
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break;
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case BUCK2:
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case BUCK3:
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case BUCK4:
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ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
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mcp16502_ramp_b234[val]);
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break;
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default:
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return -EINVAL;
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}
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return ret;
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}
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#ifdef CONFIG_SUSPEND
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/*
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* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
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* mode
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*/
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static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)
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{
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switch (pm_suspend_target_state) {
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case PM_SUSPEND_STANDBY:
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return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_LPM);
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case PM_SUSPEND_ON:
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case PM_SUSPEND_MEM:
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return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_HIB);
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default:
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dev_err(&rdev->dev, "invalid suspend target: %d\n",
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pm_suspend_target_state);
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}
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return -EINVAL;
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}
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/*
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* mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
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*/
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static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)
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{
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int sel = regulator_map_voltage_linear_range(rdev, uV, uV);
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int reg = mcp16502_suspend_get_target_reg(rdev);
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if (sel < 0)
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return sel;
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if (reg < 0)
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return reg;
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return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel);
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}
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/*
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* mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
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*/
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static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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switch (pm_suspend_target_state) {
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case PM_SUSPEND_STANDBY:
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);
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case PM_SUSPEND_ON:
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case PM_SUSPEND_MEM:
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return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);
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default:
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dev_err(&rdev->dev, "invalid suspend target: %d\n",
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pm_suspend_target_state);
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}
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return -EINVAL;
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}
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/*
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* mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
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*/
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static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)
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{
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int reg = mcp16502_suspend_get_target_reg(rdev);
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if (reg < 0)
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return reg;
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return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN);
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}
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/*
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* mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
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*/
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static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)
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{
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int reg = mcp16502_suspend_get_target_reg(rdev);
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if (reg < 0)
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return reg;
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return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0);
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}
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#endif /* CONFIG_SUSPEND */
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static const struct regulator_ops mcp16502_buck_ops = {
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mcp16502_get_status,
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.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
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.set_ramp_delay = regulator_set_ramp_delay_regmap,
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.set_mode = mcp16502_set_mode,
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.get_mode = mcp16502_get_mode,
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#ifdef CONFIG_SUSPEND
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.set_suspend_voltage = mcp16502_set_suspend_voltage,
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.set_suspend_mode = mcp16502_set_suspend_mode,
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.set_suspend_enable = mcp16502_set_suspend_enable,
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.set_suspend_disable = mcp16502_set_suspend_disable,
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#endif /* CONFIG_SUSPEND */
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};
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/*
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* LDOs cannot change operating modes.
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*/
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static const struct regulator_ops mcp16502_ldo_ops = {
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mcp16502_get_status,
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.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
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.set_ramp_delay = regulator_set_ramp_delay_regmap,
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#ifdef CONFIG_SUSPEND
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.set_suspend_voltage = mcp16502_set_suspend_voltage,
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.set_suspend_enable = mcp16502_set_suspend_enable,
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.set_suspend_disable = mcp16502_set_suspend_disable,
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#endif /* CONFIG_SUSPEND */
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};
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static const struct of_device_id mcp16502_ids[] = {
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{ .compatible = "microchip,mcp16502", },
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{}
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};
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MODULE_DEVICE_TABLE(of, mcp16502_ids);
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static const struct linear_range b1l12_ranges[] = {
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REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),
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};
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static const struct linear_range b234_ranges[] = {
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REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),
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};
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static const struct regulator_desc mcp16502_desc[] = {
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/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops, ramp_table) */
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MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops,
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mcp16502_ramp_b1l12),
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MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops,
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mcp16502_ramp_b234),
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MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops,
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mcp16502_ramp_b234),
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MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops,
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mcp16502_ramp_b234),
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MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops,
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mcp16502_ramp_b1l12),
|
|
MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops,
|
|
mcp16502_ramp_b1l12)
|
|
};
|
|
|
|
static const struct regmap_range mcp16502_ranges[] = {
|
|
regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)
|
|
};
|
|
|
|
static const struct regmap_access_table mcp16502_yes_reg_table = {
|
|
.yes_ranges = mcp16502_ranges,
|
|
.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),
|
|
};
|
|
|
|
static const struct regmap_config mcp16502_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = MCP16502_MAX_REG,
|
|
.cache_type = REGCACHE_NONE,
|
|
.rd_table = &mcp16502_yes_reg_table,
|
|
.wr_table = &mcp16502_yes_reg_table,
|
|
};
|
|
|
|
static int mcp16502_probe(struct i2c_client *client)
|
|
{
|
|
struct regulator_config config = { };
|
|
struct regulator_dev *rdev;
|
|
struct device *dev;
|
|
struct mcp16502 *mcp;
|
|
struct regmap *rmap;
|
|
int i, ret;
|
|
|
|
dev = &client->dev;
|
|
config.dev = dev;
|
|
|
|
mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
|
|
if (!mcp)
|
|
return -ENOMEM;
|
|
|
|
rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);
|
|
if (IS_ERR(rmap)) {
|
|
ret = PTR_ERR(rmap);
|
|
dev_err(dev, "regmap init failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
i2c_set_clientdata(client, mcp);
|
|
config.regmap = rmap;
|
|
config.driver_data = mcp;
|
|
|
|
mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW);
|
|
if (IS_ERR(mcp->lpm)) {
|
|
dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
|
|
return PTR_ERR(mcp->lpm);
|
|
}
|
|
|
|
for (i = 0; i < NUM_REGULATORS; i++) {
|
|
rdev = devm_regulator_register(dev, &mcp16502_desc[i], &config);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(dev,
|
|
"failed to register %s regulator %ld\n",
|
|
mcp16502_desc[i].name, PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
}
|
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mcp16502_suspend_noirq(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct mcp16502 *mcp = i2c_get_clientdata(client);
|
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mcp16502_resume_noirq(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct mcp16502 *mcp = i2c_get_clientdata(client);
|
|
|
|
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM
|
|
static const struct dev_pm_ops mcp16502_pm_ops = {
|
|
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
|
|
mcp16502_resume_noirq)
|
|
};
|
|
#endif
|
|
static const struct i2c_device_id mcp16502_i2c_id[] = {
|
|
{ "mcp16502", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);
|
|
|
|
static struct i2c_driver mcp16502_drv = {
|
|
.probe_new = mcp16502_probe,
|
|
.driver = {
|
|
.name = "mcp16502-regulator",
|
|
.of_match_table = of_match_ptr(mcp16502_ids),
|
|
#ifdef CONFIG_PM
|
|
.pm = &mcp16502_pm_ops,
|
|
#endif
|
|
},
|
|
.id_table = mcp16502_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(mcp16502_drv);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("MCP16502 PMIC driver");
|
|
MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");
|