path: root/drivers/regulator/palmas-regulator.c

/*
 * Driver for Regulator part of Palmas PMIC Chips
 *
 * Copyright 2011-2012 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/mfd/palmas.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/of_regulator.h>

struct regs_info {
	char	*name;
	u8	vsel_addr;
	u8	ctrl_addr;
	u8	tstep_addr;
};

static const struct regs_info palmas_regs_info[] = {
	{
		.name		= "SMPS12",
		.vsel_addr	= PALMAS_SMPS12_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS12_CTRL,
		.tstep_addr	= PALMAS_SMPS12_TSTEP,
	},
	{
		.name		= "SMPS123",
		.vsel_addr	= PALMAS_SMPS12_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS12_CTRL,
		.tstep_addr	= PALMAS_SMPS12_TSTEP,
	},
	{
		.name		= "SMPS3",
		.vsel_addr	= PALMAS_SMPS3_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS3_CTRL,
	},
	{
		.name		= "SMPS45",
		.vsel_addr	= PALMAS_SMPS45_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS45_CTRL,
		.tstep_addr	= PALMAS_SMPS45_TSTEP,
	},
	{
		.name		= "SMPS457",
		.vsel_addr	= PALMAS_SMPS45_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS45_CTRL,
		.tstep_addr	= PALMAS_SMPS45_TSTEP,
	},
	{
		.name		= "SMPS6",
		.vsel_addr	= PALMAS_SMPS6_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS6_CTRL,
		.tstep_addr	= PALMAS_SMPS6_TSTEP,
	},
	{
		.name		= "SMPS7",
		.vsel_addr	= PALMAS_SMPS7_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS7_CTRL,
	},
	{
		.name		= "SMPS8",
		.vsel_addr	= PALMAS_SMPS8_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS8_CTRL,
		.tstep_addr	= PALMAS_SMPS8_TSTEP,
	},
	{
		.name		= "SMPS9",
		.vsel_addr	= PALMAS_SMPS9_VOLTAGE,
		.ctrl_addr	= PALMAS_SMPS9_CTRL,
	},
	{
		.name		= "SMPS10",
	},
	{
		.name		= "LDO1",
		.vsel_addr	= PALMAS_LDO1_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO1_CTRL,
	},
	{
		.name		= "LDO2",
		.vsel_addr	= PALMAS_LDO2_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO2_CTRL,
	},
	{
		.name		= "LDO3",
		.vsel_addr	= PALMAS_LDO3_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO3_CTRL,
	},
	{
		.name		= "LDO4",
		.vsel_addr	= PALMAS_LDO4_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO4_CTRL,
	},
	{
		.name		= "LDO5",
		.vsel_addr	= PALMAS_LDO5_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO5_CTRL,
	},
	{
		.name		= "LDO6",
		.vsel_addr	= PALMAS_LDO6_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO6_CTRL,
	},
	{
		.name		= "LDO7",
		.vsel_addr	= PALMAS_LDO7_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO7_CTRL,
	},
	{
		.name		= "LDO8",
		.vsel_addr	= PALMAS_LDO8_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO8_CTRL,
	},
	{
		.name		= "LDO9",
		.vsel_addr	= PALMAS_LDO9_VOLTAGE,
		.ctrl_addr	= PALMAS_LDO9_CTRL,
	},
	{
		.name		= "LDOLN",
		.vsel_addr	= PALMAS_LDOLN_VOLTAGE,
		.ctrl_addr	= PALMAS_LDOLN_CTRL,
	},
	{
		.name		= "LDOUSB",
		.vsel_addr	= PALMAS_LDOUSB_VOLTAGE,
		.ctrl_addr	= PALMAS_LDOUSB_CTRL,
	},
};

#define SMPS_CTRL_MODE_OFF		0x00
#define SMPS_CTRL_MODE_ON		0x01
#define SMPS_CTRL_MODE_ECO		0x02
#define SMPS_CTRL_MODE_PWM		0x03

/* These values are derived from the data sheet. And are the number of steps
 * where there is a voltage change, the ranges at beginning and end of register
 * max/min values where there are no change are ommitted.
 *
 * So they are basically (maxV-minV)/stepV
 */
#define PALMAS_SMPS_NUM_VOLTAGES	116
#define PALMAS_SMPS10_NUM_VOLTAGES	2
#define PALMAS_LDO_NUM_VOLTAGES		50

#define SMPS10_VSEL			(1<<3)
#define SMPS10_BOOST_EN			(1<<2)
#define SMPS10_BYPASS_EN		(1<<1)
#define SMPS10_SWITCH_EN		(1<<0)

#define REGULATOR_SLAVE			0

static int palmas_smps_read(struct palmas *palmas, unsigned int reg,
		unsigned int *dest)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE, reg);

	return regmap_read(palmas->regmap[REGULATOR_SLAVE], addr, dest);
}

static int palmas_smps_write(struct palmas *palmas, unsigned int reg,
		unsigned int value)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_SMPS_BASE, reg);

	return regmap_write(palmas->regmap[REGULATOR_SLAVE], addr, value);
}

static int palmas_ldo_read(struct palmas *palmas, unsigned int reg,
		unsigned int *dest)
{
	unsigned int addr;

	addr = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE, reg);

	return regmap_read(palmas->