552 lines
16 KiB
C
552 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// max77686.c - Regulator driver for the Maxim 77686
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//
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// Copyright (C) 2012 Samsung Electronics
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// Chiwoong Byun <woong.byun@samsung.com>
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// Jonghwa Lee <jonghwa3.lee@samsung.com>
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//
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// This driver is based on max8997.c
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.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/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/mfd/max77686.h>
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#include <linux/mfd/max77686-private.h>
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#define MAX77686_LDO_MINUV 800000
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#define MAX77686_LDO_UVSTEP 50000
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#define MAX77686_LDO_LOW_MINUV 800000
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#define MAX77686_LDO_LOW_UVSTEP 25000
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#define MAX77686_BUCK_MINUV 750000
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#define MAX77686_BUCK_UVSTEP 50000
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#define MAX77686_BUCK_ENABLE_TIME 40 /* us */
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#define MAX77686_DVS_ENABLE_TIME 22 /* us */
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#define MAX77686_RAMP_DELAY 100000 /* uV/us */
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#define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
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#define MAX77686_DVS_MINUV 600000
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#define MAX77686_DVS_UVSTEP 12500
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/*
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* Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
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* It is the same as 'off' for other regulators.
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*/
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#define MAX77686_GPIO_CONTROL 0x0
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/*
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* Values used for configuring LDOs and bucks.
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* Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
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*/
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#define MAX77686_LDO_LOWPOWER 0x1
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/*
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* On/off controlled by PWRREQ:
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* - LDO2, 6-8, 10-12, 14-16
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* - buck[1234]
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*/
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#define MAX77686_OFF_PWRREQ 0x1
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/* Low power mode controlled by PWRREQ: All LDOs */
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#define MAX77686_LDO_LOWPOWER_PWRREQ 0x2
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/* Forcing low power mode: buck[234] */
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#define MAX77686_BUCK_LOWPOWER 0x2
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#define MAX77686_NORMAL 0x3
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#define MAX77686_OPMODE_SHIFT 6
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#define MAX77686_OPMODE_BUCK234_SHIFT 4
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#define MAX77686_OPMODE_MASK 0x3
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#define MAX77686_VSEL_MASK 0x3F
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#define MAX77686_DVS_VSEL_MASK 0xFF
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#define MAX77686_RAMP_RATE_MASK 0xC0
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#define MAX77686_REGULATORS MAX77686_REG_MAX
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#define MAX77686_LDOS 26
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enum max77686_ramp_rate {
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RAMP_RATE_13P75MV,
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RAMP_RATE_27P5MV,
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RAMP_RATE_55MV,
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RAMP_RATE_NO_CTRL, /* 100mV/us */
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};
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struct max77686_data {
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DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
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/* Array indexed by regulator id */
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unsigned int opmode[MAX77686_REGULATORS];
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};
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static unsigned int max77686_get_opmode_shift(int id)
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{
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switch (id) {
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case MAX77686_BUCK1:
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case MAX77686_BUCK5 ... MAX77686_BUCK9:
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return 0;
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case MAX77686_BUCK2 ... MAX77686_BUCK4:
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return MAX77686_OPMODE_BUCK234_SHIFT;
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default:
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/* all LDOs */
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return MAX77686_OPMODE_SHIFT;
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}
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}
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/*
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* When regulator is configured for GPIO control then it
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* replaces "normal" mode. Any change from low power mode to normal
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* should actually change to GPIO control.
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* Map normal mode to proper value for such regulators.
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*/
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static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
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int id)
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{
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switch (id) {
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case MAX77686_BUCK8:
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case MAX77686_BUCK9:
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case MAX77686_LDO20 ... MAX77686_LDO22:
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if (test_bit(id, max77686->gpio_enabled))
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return MAX77686_GPIO_CONTROL;
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}
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return MAX77686_NORMAL;
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}
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/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
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static int max77686_set_suspend_disable(struct regulator_dev *rdev)
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{
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unsigned int val, shift;
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struct max77686_data *max77686 = rdev_get_drvdata(rdev);
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int ret, id = rdev_get_id(rdev);
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shift = max77686_get_opmode_shift(id);
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val = MAX77686_OFF_PWRREQ;
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask, val << shift);
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if (ret)
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return ret;
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max77686->opmode[id] = val;
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return 0;
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}
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/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
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static int max77686_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct max77686_data *max77686 = rdev_get_drvdata(rdev);
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unsigned int val;
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int ret, id = rdev_get_id(rdev);
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/* BUCK[5-9] doesn't support this feature */
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if (id >= MAX77686_BUCK5)
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return 0;
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switch (mode) {
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case REGULATOR_MODE_IDLE: /* ON in LP Mode */
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val = MAX77686_LDO_LOWPOWER_PWRREQ;
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break;
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case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
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val = max77686_map_normal_mode(max77686, id);
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break;
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default:
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pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
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rdev->desc->name, mode);
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return -EINVAL;
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}
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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val << MAX77686_OPMODE_SHIFT);
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if (ret)
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return ret;
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max77686->opmode[id] = val;
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return 0;
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}
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/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
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static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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unsigned int val;
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struct max77686_data *max77686 = rdev_get_drvdata(rdev);
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int ret, id = rdev_get_id(rdev);
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switch (mode) {
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case REGULATOR_MODE_STANDBY: /* switch off */
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val = MAX77686_OFF_PWRREQ;
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break;
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case REGULATOR_MODE_IDLE: /* ON in LP Mode */
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val = MAX77686_LDO_LOWPOWER_PWRREQ;
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break;
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case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
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val = max77686_map_normal_mode(max77686, id);
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break;
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default:
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pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
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rdev->desc->name, mode);
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return -EINVAL;
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}
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ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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val << MAX77686_OPMODE_SHIFT);
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if (ret)
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return ret;
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max77686->opmode[id] = val;
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return 0;
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}
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static int max77686_enable(struct regulator_dev *rdev)
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{
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struct max77686_data *max77686 = rdev_get_drvdata(rdev);
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unsigned int shift;
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int id = rdev_get_id(rdev);
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shift = max77686_get_opmode_shift(id);
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if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
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max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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max77686->opmode[id] << shift);
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}
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static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
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{
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unsigned int ramp_value = RAMP_RATE_NO_CTRL;
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switch (ramp_delay) {
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case 1 ... 13750:
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ramp_value = RAMP_RATE_13P75MV;
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break;
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case 13751 ... 27500:
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ramp_value = RAMP_RATE_27P5MV;
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break;
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case 27501 ... 55000:
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ramp_value = RAMP_RATE_55MV;
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break;
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case 55001 ... 100000:
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break;
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default:
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pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
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rdev->desc->name, ramp_delay);
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}
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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MAX77686_RAMP_RATE_MASK, ramp_value << 6);
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}
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static int max77686_of_parse_cb(struct device_node *np,
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const struct regulator_desc *desc,
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struct regulator_config *config)
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{
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struct max77686_data *max77686 = config->driver_data;
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switch (desc->id) {
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case MAX77686_BUCK8:
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case MAX77686_BUCK9:
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case MAX77686_LDO20 ... MAX77686_LDO22:
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config->ena_gpio = of_get_named_gpio(np,
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"maxim,ena-gpios", 0);
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config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
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config->ena_gpio_initialized = true;
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break;
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default:
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return 0;
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}
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if (gpio_is_valid(config->ena_gpio)) {
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set_bit(desc->id, max77686->gpio_enabled);
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return regmap_update_bits(config->regmap, desc->enable_reg,
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desc->enable_mask,
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MAX77686_GPIO_CONTROL);
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}
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return 0;
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}
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static const struct regulator_ops max77686_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = max77686_enable,
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.disable = regulator_disable_regmap,
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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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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_suspend_mode = max77686_set_suspend_mode,
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};
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static const struct regulator_ops max77686_ldo_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = max77686_enable,
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.disable = regulator_disable_regmap,
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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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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_suspend_mode = max77686_ldo_set_suspend_mode,
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.set_suspend_disable = max77686_set_suspend_disable,
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};
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static const struct regulator_ops max77686_buck1_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = max77686_enable,
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.disable = regulator_disable_regmap,
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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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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_suspend_disable = max77686_set_suspend_disable,
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};
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static const struct regulator_ops max77686_buck_dvs_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = regulator_is_enabled_regmap,
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.enable = max77686_enable,
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.disable = regulator_disable_regmap,
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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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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_ramp_delay = max77686_set_ramp_delay,
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.set_suspend_disable = max77686_set_suspend_disable,
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};
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#define regulator_desc_ldo(num) { \
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.name = "LDO"#num, \
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.of_match = of_match_ptr("LDO"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.of_parse_cb = max77686_of_parse_cb, \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_MINUV, \
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.uV_step = MAX77686_LDO_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_lpm_ldo(num) { \
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.name = "LDO"#num, \
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.of_match = of_match_ptr("LDO"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ldo_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_MINUV, \
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.uV_step = MAX77686_LDO_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_ldo_low(num) { \
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.name = "LDO"#num, \
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.of_match = of_match_ptr("LDO"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ldo_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_LOW_MINUV, \
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.uV_step = MAX77686_LDO_LOW_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_ldo1_low(num) { \
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.name = "LDO"#num, \
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.of_match = of_match_ptr("LDO"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_LDO_LOW_MINUV, \
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.uV_step = MAX77686_LDO_LOW_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
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.enable_mask = MAX77686_OPMODE_MASK \
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<< MAX77686_OPMODE_SHIFT, \
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}
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#define regulator_desc_buck(num) { \
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.name = "BUCK"#num, \
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.of_match = of_match_ptr("BUCK"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.of_parse_cb = max77686_of_parse_cb, \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_BUCK_MINUV, \
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.uV_step = MAX77686_BUCK_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.enable_time = MAX77686_BUCK_ENABLE_TIME, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
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.enable_mask = MAX77686_OPMODE_MASK, \
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}
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#define regulator_desc_buck1(num) { \
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.name = "BUCK"#num, \
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.of_match = of_match_ptr("BUCK"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_buck1_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.min_uV = MAX77686_BUCK_MINUV, \
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.uV_step = MAX77686_BUCK_UVSTEP, \
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.ramp_delay = MAX77686_RAMP_DELAY, \
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.enable_time = MAX77686_BUCK_ENABLE_TIME, \
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.n_voltages = MAX77686_VSEL_MASK + 1, \
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.vsel_reg = MAX77686_REG_BUCK1OUT, \
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.vsel_mask = MAX77686_VSEL_MASK, \
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.enable_reg = MAX77686_REG_BUCK1CTRL, \
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.enable_mask = MAX77686_OPMODE_MASK, \
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}
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#define regulator_desc_buck_dvs(num) { \
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.name = "BUCK"#num, \
|
|
.of_match = of_match_ptr("BUCK"#num), \
|
|
.regulators_node = of_match_ptr("voltage-regulators"), \
|
|
.id = MAX77686_BUCK##num, \
|
|
.ops = &max77686_buck_dvs_ops, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
.min_uV = MAX77686_DVS_MINUV, \
|
|
.uV_step = MAX77686_DVS_UVSTEP, \
|
|
.ramp_delay = MAX77686_DVS_RAMP_DELAY, \
|
|
.enable_time = MAX77686_DVS_ENABLE_TIME, \
|
|
.n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
|
|
.vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
|
|
.vsel_mask = MAX77686_DVS_VSEL_MASK, \
|
|
.enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
|
|
.enable_mask = MAX77686_OPMODE_MASK \
|
|
<< MAX77686_OPMODE_BUCK234_SHIFT, \
|
|
}
|
|
|
|
static const struct regulator_desc regulators[] = {
|
|
regulator_desc_ldo1_low(1),
|
|
regulator_desc_ldo_low(2),
|
|
regulator_desc_ldo(3),
|
|
regulator_desc_ldo(4),
|
|
regulator_desc_ldo(5),
|
|
regulator_desc_ldo_low(6),
|
|
regulator_desc_ldo_low(7),
|
|
regulator_desc_ldo_low(8),
|
|
regulator_desc_ldo(9),
|
|
regulator_desc_lpm_ldo(10),
|
|
regulator_desc_lpm_ldo(11),
|
|
regulator_desc_lpm_ldo(12),
|
|
regulator_desc_ldo(13),
|
|
regulator_desc_lpm_ldo(14),
|
|
regulator_desc_ldo_low(15),
|
|
regulator_desc_lpm_ldo(16),
|
|
regulator_desc_ldo(17),
|
|
regulator_desc_ldo(18),
|
|
regulator_desc_ldo(19),
|
|
regulator_desc_ldo(20),
|
|
regulator_desc_ldo(21),
|
|
regulator_desc_ldo(22),
|
|
regulator_desc_ldo(23),
|
|
regulator_desc_ldo(24),
|
|
regulator_desc_ldo(25),
|
|
regulator_desc_ldo(26),
|
|
regulator_desc_buck1(1),
|
|
regulator_desc_buck_dvs(2),
|
|
regulator_desc_buck_dvs(3),
|
|
regulator_desc_buck_dvs(4),
|
|
regulator_desc_buck(5),
|
|
regulator_desc_buck(6),
|
|
regulator_desc_buck(7),
|
|
regulator_desc_buck(8),
|
|
regulator_desc_buck(9),
|
|
};
|
|
|
|
static int max77686_pmic_probe(struct platform_device *pdev)
|
|
{
|
|
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
|
|
struct max77686_data *max77686;
|
|
int i;
|
|
struct regulator_config config = { };
|
|
|
|
dev_dbg(&pdev->dev, "%s\n", __func__);
|
|
|
|
max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
|
|
GFP_KERNEL);
|
|
if (!max77686)
|
|
return -ENOMEM;
|
|
|
|
config.dev = iodev->dev;
|
|
config.regmap = iodev->regmap;
|
|
config.driver_data = max77686;
|
|
platform_set_drvdata(pdev, max77686);
|
|
|
|
for (i = 0; i < MAX77686_REGULATORS; i++) {
|
|
struct regulator_dev *rdev;
|
|
int id = regulators[i].id;
|
|
|
|
max77686->opmode[id] = MAX77686_NORMAL;
|
|
rdev = devm_regulator_register(&pdev->dev,
|
|
®ulators[i], &config);
|
|
if (IS_ERR(rdev)) {
|
|
int ret = PTR_ERR(rdev);
|
|
dev_err(&pdev->dev,
|
|
"regulator init failed for %d: %d\n", i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id max77686_pmic_id[] = {
|
|
{"max77686-pmic", 0},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
|
|
|
|
static struct platform_driver max77686_pmic_driver = {
|
|
.driver = {
|
|
.name = "max77686-pmic",
|
|
},
|
|
.probe = max77686_pmic_probe,
|
|
.id_table = max77686_pmic_id,
|
|
};
|
|
|
|
module_platform_driver(max77686_pmic_driver);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
|
|
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|