366 lines
9.4 KiB
C
366 lines
9.4 KiB
C
/*
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* Voltage regulation driver for active-semi ACT8945A PMIC
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*
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* Copyright (C) 2015 Atmel Corporation
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*
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* Author: Wenyou Yang <wenyou.yang@atmel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <dt-bindings/regulator/active-semi,8945a-regulator.h>
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/**
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* ACT8945A Global Register Map.
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*/
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#define ACT8945A_SYS_MODE 0x00
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#define ACT8945A_SYS_CTRL 0x01
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#define ACT8945A_SYS_UNLK_REGS 0x0b
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#define ACT8945A_DCDC1_VSET1 0x20
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#define ACT8945A_DCDC1_VSET2 0x21
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#define ACT8945A_DCDC1_CTRL 0x22
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#define ACT8945A_DCDC1_SUS 0x24
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#define ACT8945A_DCDC2_VSET1 0x30
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#define ACT8945A_DCDC2_VSET2 0x31
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#define ACT8945A_DCDC2_CTRL 0x32
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#define ACT8945A_DCDC2_SUS 0x34
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#define ACT8945A_DCDC3_VSET1 0x40
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#define ACT8945A_DCDC3_VSET2 0x41
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#define ACT8945A_DCDC3_CTRL 0x42
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#define ACT8945A_DCDC3_SUS 0x44
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#define ACT8945A_LDO1_VSET 0x50
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#define ACT8945A_LDO1_CTRL 0x51
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#define ACT8945A_LDO1_SUS 0x52
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#define ACT8945A_LDO2_VSET 0x54
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#define ACT8945A_LDO2_CTRL 0x55
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#define ACT8945A_LDO2_SUS 0x56
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#define ACT8945A_LDO3_VSET 0x60
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#define ACT8945A_LDO3_CTRL 0x61
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#define ACT8945A_LDO3_SUS 0x62
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#define ACT8945A_LDO4_VSET 0x64
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#define ACT8945A_LDO4_CTRL 0x65
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#define ACT8945A_LDO4_SUS 0x66
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/**
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* Field Definitions.
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*/
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#define ACT8945A_ENA 0x80 /* ON - [7] */
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#define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */
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/**
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* ACT8945A Voltage Number
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*/
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#define ACT8945A_VOLTAGE_NUM 64
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enum {
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ACT8945A_ID_DCDC1,
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ACT8945A_ID_DCDC2,
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ACT8945A_ID_DCDC3,
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ACT8945A_ID_LDO1,
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ACT8945A_ID_LDO2,
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ACT8945A_ID_LDO3,
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ACT8945A_ID_LDO4,
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ACT8945A_ID_MAX,
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};
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struct act8945a_pmic {
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struct regmap *regmap;
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u32 op_mode[ACT8945A_ID_MAX];
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};
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static const struct regulator_linear_range act8945a_voltage_ranges[] = {
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REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
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REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
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REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
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};
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static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
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{
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struct regmap *regmap = rdev->regmap;
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int id = rdev_get_id(rdev);
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int reg, val;
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switch (id) {
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case ACT8945A_ID_DCDC1:
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reg = ACT8945A_DCDC1_SUS;
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val = 0xa8;
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break;
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case ACT8945A_ID_DCDC2:
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reg = ACT8945A_DCDC2_SUS;
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val = 0xa8;
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break;
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case ACT8945A_ID_DCDC3:
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reg = ACT8945A_DCDC3_SUS;
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val = 0xa8;
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break;
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case ACT8945A_ID_LDO1:
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reg = ACT8945A_LDO1_SUS;
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val = 0xe8;
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break;
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case ACT8945A_ID_LDO2:
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reg = ACT8945A_LDO2_SUS;
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val = 0xe8;
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break;
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case ACT8945A_ID_LDO3:
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reg = ACT8945A_LDO3_SUS;
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val = 0xe8;
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break;
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case ACT8945A_ID_LDO4:
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reg = ACT8945A_LDO4_SUS;
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val = 0xe8;
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break;
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default:
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return -EINVAL;
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}
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if (enable)
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val |= BIT(4);
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/*
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* Ask the PMIC to enable/disable this output when entering hibernate
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* mode.
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*/
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return regmap_write(regmap, reg, val);
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}
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static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
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{
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return act8945a_set_suspend_state(rdev, true);
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}
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static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
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{
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return act8945a_set_suspend_state(rdev, false);
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}
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static unsigned int act8945a_of_map_mode(unsigned int mode)
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{
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switch (mode) {
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case ACT8945A_REGULATOR_MODE_FIXED:
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case ACT8945A_REGULATOR_MODE_NORMAL:
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return REGULATOR_MODE_NORMAL;
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case ACT8945A_REGULATOR_MODE_LOWPOWER:
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return REGULATOR_MODE_STANDBY;
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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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static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
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struct regmap *regmap = rdev->regmap;
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int id = rdev_get_id(rdev);
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int reg, ret, val = 0;
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switch (id) {
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case ACT8945A_ID_DCDC1:
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reg = ACT8945A_DCDC1_CTRL;
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break;
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case ACT8945A_ID_DCDC2:
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reg = ACT8945A_DCDC2_CTRL;
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break;
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case ACT8945A_ID_DCDC3:
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reg = ACT8945A_DCDC3_CTRL;
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break;
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case ACT8945A_ID_LDO1:
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reg = ACT8945A_LDO1_SUS;
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break;
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case ACT8945A_ID_LDO2:
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reg = ACT8945A_LDO2_SUS;
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break;
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case ACT8945A_ID_LDO3:
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reg = ACT8945A_LDO3_SUS;
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break;
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case ACT8945A_ID_LDO4:
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reg = ACT8945A_LDO4_SUS;
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break;
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default:
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return -EINVAL;
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}
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switch (mode) {
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case REGULATOR_MODE_STANDBY:
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if (id > ACT8945A_ID_DCDC3)
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val = BIT(5);
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break;
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case REGULATOR_MODE_NORMAL:
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if (id <= ACT8945A_ID_DCDC3)
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val = BIT(5);
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break;
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default:
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return -EINVAL;
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}
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ret = regmap_update_bits(regmap, reg, BIT(5), val);
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if (ret)
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return ret;
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act8945a->op_mode[id] = mode;
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return 0;
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}
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static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
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{
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struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
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int id = rdev_get_id(rdev);
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if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
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return -EINVAL;
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return act8945a->op_mode[id];
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}
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static const struct regulator_ops act8945a_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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.set_mode = act8945a_set_mode,
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.get_mode = act8945a_get_mode,
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.is_enabled = regulator_is_enabled_regmap,
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.set_suspend_enable = act8945a_set_suspend_enable,
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.set_suspend_disable = act8945a_set_suspend_disable,
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};
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#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \
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[_family##_ID_##_id] = { \
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.name = _name, \
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.supply_name = _supply, \
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.of_match = of_match_ptr("REG_"#_id), \
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.of_map_mode = act8945a_of_map_mode, \
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.regulators_node = of_match_ptr("regulators"), \
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.id = _family##_ID_##_id, \
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.type = REGULATOR_VOLTAGE, \
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.ops = &act8945a_ops, \
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.n_voltages = ACT8945A_VOLTAGE_NUM, \
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.linear_ranges = act8945a_voltage_ranges, \
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.n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \
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.vsel_reg = _family##_##_id##_##_vsel_reg, \
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.vsel_mask = ACT8945A_VSEL_MASK, \
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.enable_reg = _family##_##_id##_CTRL, \
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.enable_mask = ACT8945A_ENA, \
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.owner = THIS_MODULE, \
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}
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static const struct regulator_desc act8945a_regulators[] = {
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ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
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ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
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ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
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ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
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ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
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ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
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ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
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};
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static const struct regulator_desc act8945a_alt_regulators[] = {
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ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
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ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
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ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
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ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
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ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
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ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
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ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
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};
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static int act8945a_pmic_probe(struct platform_device *pdev)
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{
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struct regulator_config config = { };
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const struct regulator_desc *regulators;
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struct act8945a_pmic *act8945a;
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struct regulator_dev *rdev;
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int i, num_regulators;
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bool voltage_select;
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act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
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if (!act8945a)
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return -ENOMEM;
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act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!act8945a->regmap) {
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dev_err(&pdev->dev,
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"could not retrieve regmap from parent device\n");
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return -EINVAL;
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}
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voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
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"active-semi,vsel-high");
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if (voltage_select) {
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regulators = act8945a_alt_regulators;
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num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
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} else {
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regulators = act8945a_regulators;
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num_regulators = ARRAY_SIZE(act8945a_regulators);
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}
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config.dev = &pdev->dev;
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config.dev->of_node = pdev->dev.parent->of_node;
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config.driver_data = act8945a;
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for (i = 0; i < num_regulators; i++) {
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rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
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&config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev,
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"failed to register %s regulator\n",
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regulators[i].name);
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return PTR_ERR(rdev);
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}
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}
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platform_set_drvdata(pdev, act8945a);
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/* Unlock expert registers. */
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return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
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}
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static int __maybe_unused act8945a_suspend(struct device *pdev)
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{
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struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
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/*
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* Ask the PMIC to enter the suspend mode on the next PWRHLD
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* transition.
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*/
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return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
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}
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static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
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static void act8945a_pmic_shutdown(struct platform_device *pdev)
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{
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struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
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/*
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* Ask the PMIC to shutdown everything on the next PWRHLD transition.
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*/
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regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
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}
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static struct platform_driver act8945a_pmic_driver = {
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.driver = {
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.name = "act8945a-regulator",
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.pm = &act8945a_pm,
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},
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.probe = act8945a_pmic_probe,
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.shutdown = act8945a_pmic_shutdown,
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};
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module_platform_driver(act8945a_pmic_driver);
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MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
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MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
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MODULE_LICENSE("GPL");
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