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/*
* da9052-regulator.c: Regulator driver for DA9052
*
* Copyright(c) 2011 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* 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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#ifdef CONFIG_OF
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
#endif
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#include <linux/mfd/da9052/pdata.h>
/* Buck step size */
#define DA9052_BUCK_PERI_3uV_STEP 100000
#define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV 24
#define DA9052_CONST_3uV 3000000
#define DA9052_MIN_UA 0
#define DA9052_MAX_UA 3
#define DA9052_CURRENT_RANGE 4
/* Bit masks */
#define DA9052_BUCK_ILIM_MASK_EVEN 0x0c
#define DA9052_BUCK_ILIM_MASK_ODD 0xc0
/* DA9052 REGULATOR IDs */
#define DA9052_ID_BUCK1 0
#define DA9052_ID_BUCK2 1
#define DA9052_ID_BUCK3 2
#define DA9052_ID_BUCK4 3
#define DA9052_ID_LDO1 4
#define DA9052_ID_LDO2 5
#define DA9052_ID_LDO3 6
#define DA9052_ID_LDO4 7
#define DA9052_ID_LDO5 8
#define DA9052_ID_LDO6 9
#define DA9052_ID_LDO7 10
#define DA9052_ID_LDO8 11
#define DA9052_ID_LDO9 12
#define DA9052_ID_LDO10 13
static const u32 da9052_current_limits[3][4] = {
{700000, 800000, 1000000, 1200000}, /* DA9052-BC BUCKs */
{1600000, 2000000, 2400000, 3000000}, /* DA9053-AA/Bx BUCK-CORE */
{800000, 1000000, 1200000, 1500000}, /* DA9053-AA/Bx BUCK-PRO,
* BUCK-MEM and BUCK-PERI
*/
};
struct da9052_regulator_info {
struct regulator_desc reg_desc;
int step_uV;
int min_uV;
int max_uV;
};
struct da9052_regulator {
struct da9052 *da9052;
struct da9052_regulator_info *info;
struct regulator_dev *rdev;
};
static int verify_range(struct da9052_regulator_info *info,
int min_uV, int max_uV)
{
if (min_uV > info->max_uV || max_uV < info->min_uV)
return -EINVAL;
return 0;
}
static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
{
struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
int offset = rdev_get_id(rdev);
int ret, row = 2;
ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
if (ret < 0)
return ret;
/* Determine the even or odd position of the buck current limit
* register field
*/
if (offset % 2 == 0)
ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
else
ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
/* Select the appropriate current limit range */
if (regulator->da9052->chip_id == DA9052)
row = 0;
else if (offset == 0)
row = 1;
return da9052_current_limits[row][ret];
}
static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
int max_uA)
{
struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
int offset = rdev_get_id(rdev);
int reg_val = 0;
int i, row = 2;
/* Select the appropriate current limit range */
if (regulator->da9052->chip_id == DA9052)
row = 0;
else if (offset == 0)
row = 1;
for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
if ((min_uA <= da9052_current_limits[row][i]) &&
(da9052_current_limits[row][i] <= max_uA)) {
reg_val = i;
break;
}
}
if (i < 0)
return -EINVAL;
/* Determine the even or odd position of the buck current limit
* register field
*/
if (offset % 2 == 0)
return da9052_reg_update(regulator->da9052,
DA9052_BUCKA_REG + offset/2,
DA9052_BUCK_ILIM_MASK_EVEN,
reg_val << 2);
else
return da9052_reg_update(regulator->da9052,
DA9052_BUCKA_REG + offset/2,
DA9052_BUCK_ILIM_MASK_ODD,
reg_val << 6);
}
static int da9052_list_voltage(struct regulator_dev *rdev,
unsigned int selector)
{
struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
struct da9052_regulator_info *info = regulator->info;
int id = rdev_get_id(rdev);
int volt_uV;
if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
+ info->min_uV);
volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
* (DA9052_BUCK_PERI_3uV_STEP);
} else {
volt_uV = (selector * info->step_uV) + info->min_uV;
}
if (volt_uV > info->max_uV)
return -EINVAL;
return volt_uV;
}
static int da9052_map_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
struct da9052_regulator_info *info = regulator->info;
int id = rdev_get_id(rdev);
int ret, sel;
ret = verify_range(info, min_uV, max_uV);
if (ret < 0)
return ret;
if (min_uV < info->min_uV)
min_uV = info->min_uV;
if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
&& (min_uV >= DA9052_CONST_3uV)) {
sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
DA9052_BUCK_PERI_3uV_STEP);
} else {
sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
}
ret = da9052_list_voltage(rdev, sel);
if (ret < 0)
return ret;
return sel;
}
static struct regulator_ops da9052_dcdc_ops = {
.get_current_limit = da9052_dcdc_get_current_limit,
.set_current_limit = da9052_dcdc_set_current_limit,
.list_voltage = da9052_list_voltage,
.map_voltage = da9052_map_voltage,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static struct regulator_ops da9052_ldo_ops = {
.list_voltage = da9052_list_voltage,
.map_voltage = da9052_map_voltage,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
{\
.reg_desc = {\
.name = #_id,\
.ops = &da9052_ldo_ops,\
.type = REGULATOR_VOLTAGE,\
.id = DA9052_ID_##_id,\
.n_voltages = (max - min) / step + 1, \
.owner = THIS_MODULE,\
.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
.vsel_mask = (1 << (sbits)) - 1,\
.apply_reg = DA9052_SUPPLY_REG, \
.apply_bit = (abits), \
.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
.enable_mask = 1 << (ebits),\
},\
.min_uV = (min) * 1000,\
.max_uV = (max) * 1000,\
.step_uV = (step) * 1000,\
}
#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
{\
.reg_desc = {\
.name = #_id,\
.ops = &da9052_dcdc_ops,\
.type = REGULATOR_VOLTAGE,\
.id = DA9052_ID_##_id,\
.n_voltages = (max - min) / step + 1, \
.owner = THIS_MODULE,\
.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
.vsel_mask = (1 << (sbits)) - 1,\
.apply_reg = DA9052_SUPPLY_REG, \
.apply_bit = (abits), \
.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
.enable_mask = 1 << (ebits),\
},\
.min_uV = (min) * 1000,\
.max_uV = (max) * 1000,\
.step_uV = (step) * 1000,\
}
static struct da9052_regulator_info da9052_regulator_info[] = {
DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
DA9052_LDO(LDO1, 50, 600, 1800, 5,
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