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/*
* Copyright (C) 2012 Samsung Electronics
* Alim Akhtar <alim.akhtar@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <arch/io.h>
#include <common.h>
#include <device/i2c.h>
#include "max77686.h"
/* Chip register numbers (not exported from this module) */
enum {
REG_BBAT = 0x7e,
/* Bits for BBAT */
BBAT_BBCHOSTEN_MASK = 1 << 0,
BBAT_BBCVS_SHIFT = 3,
BBAT_BBCVS_MASK = 3 << BBAT_BBCVS_SHIFT,
};
/*
* Max77686 parameters values
* see max77686.h for parameters details
*/
struct max77686_para max77686_param[] = {/*{vol_addr, vol_bitpos,
vol_bitmask, reg_enaddr, reg_enbitpos, reg_enbitmask, reg_enbiton,
reg_enbitoff, vol_min, vol_div}*/
{/* PMIC_BUCK1 */ 0x11, 0x0, 0x3F, 0x10, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_BUCK2 */ 0x14, 0x0, 0xFF, 0x12, 0x4, 0x3, 0x1, 0x0, 600, 12500},
{/* PMIC_BUCK3 */ 0x1E, 0x0, 0xFF, 0x1C, 0x4, 0x3, 0x1, 0x0, 600, 12500},
{/* PMIC_BUCK4 */ 0x28, 0x0, 0xFF, 0x26, 0x4, 0x3, 0x1, 0x0, 600, 12500},
{/* PMIC_BUCK5 */ 0x31, 0x0, 0x3F, 0x30, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_BUCK6 */ 0x33, 0x0, 0x3F, 0x32, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_BUCK7 */ 0x35, 0x0, 0x3F, 0x34, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_BUCK8 */ 0x37, 0x0, 0x3F, 0x36, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_BUCK9 */ 0x39, 0x0, 0x3F, 0x38, 0x0, 0x3, 0x3, 0x0, 750, 50000},
{/* PMIC_LDO1 */ 0x40, 0x0, 0x3F, 0x40, 0x6, 0x3, 0x3, 0x0, 800, 25000},
{/* PMIC_LDO2 */ 0x41, 0x0, 0x3F, 0x41, 0x6, 0x3, 0x1, 0x0, 800, 25000},
{/* PMIC_LDO3 */ 0x42, 0x0, 0x3F, 0x42, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO4 */ 0x43, 0x0, 0x3F, 0x43, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO5 */ 0x44, 0x0, 0x3F, 0x44, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO6 */ 0x45, 0x0, 0x3F, 0x45, 0x6, 0x3, 0x1, 0x0, 800, 25000},
{/* PMIC_LDO7 */ 0x46, 0x0, 0x3F, 0x46, 0x6, 0x3, 0x1, 0x0, 800, 25000},
{/* PMIC_LDO8 */ 0x47, 0x0, 0x3F, 0x47, 0x6, 0x3, 0x1, 0x0, 800, 25000},
{/* PMIC_LDO9 */ 0x48, 0x0, 0x3F, 0x48, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO10 */ 0x49, 0x0, 0x3F, 0x49, 0x6, 0x3, 0x1, 0x0, 800, 50000},
{/* PMIC_LDO11 */ 0x4A, 0x0, 0x3F, 0x4A, 0x6, 0x3, 0x1, 0x0, 800, 50000},
{/* PMIC_LDO12 */ 0x4B, 0x0, 0x3F, 0x4B, 0x6, 0x3, 0x1, 0x0, 800, 50000},
{/* PMIC_LDO13 */ 0x4C, 0x0, 0x3F, 0x4C, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO14 */ 0x4D, 0x0, 0x3F, 0x4D, 0x6, 0x3, 0x1, 0x0, 800, 50000},
{/* PMIC_LDO15 */ 0x4E, 0x0, 0x3F, 0x4E, 0x6, 0x3, 0x1, 0x0, 800, 25000},
{/* PMIC_LDO16 */ 0x4F, 0x0, 0x3F, 0x4F, 0x6, 0x3, 0x1, 0x0, 800, 50000},
{/* PMIC_LDO17 */ 0x50, 0x0, 0x3F, 0x50, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO18 */ 0x51, 0x0, 0x3F, 0x51, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO19 */ 0x52, 0x0, 0x3F, 0x52, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO20 */ 0x53, 0x0, 0x3F, 0x53, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO21 */ 0x54, 0x0, 0x3F, 0x54, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO22 */ 0x55, 0x0, 0x3F, 0x55, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO23 */ 0x56, 0x0, 0x3F, 0x56, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO24 */ 0x57, 0x0, 0x3F, 0x57, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO25 */ 0x58, 0x0, 0x3F, 0x58, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_LDO26 */ 0x59, 0x0, 0x3F, 0x59, 0x6, 0x3, 0x3, 0x0, 800, 50000},
{/* PMIC_EN32KHZ_CP */ 0x0, 0x0, 0x0, 0x7F, 0x1, 0x1, 0x1, 0x0, 0x0, 0x0},
};
/*
* Write a value to a register
*
* @param chip_addr i2c addr for max77686
* @param reg reg number to write
* @param val value to be written
*
*/
static inline int max77686_i2c_write(unsigned int bus, unsigned char chip_addr,
unsigned int reg, unsigned char val)
{
return i2c_write(bus, chip_addr, reg, 1, &val, 1);
}
/*
* Read a value from a register
*
* @param chip_addr i2c addr for max77686
* @param reg reg number to write
* @param val value to be written
*
*/
static inline int max77686_i2c_read(unsigned int bus, unsigned char chip_addr,
unsigned int reg, unsigned char *val)
{
return i2c_read(bus, chip_addr, reg, 1, val, 1);
}
/*
* Enable the max77686 register
*
* @param reg register number of buck/ldo to be enabled
* @param enable enable or disable bit
*
* REG_DISABLE = 0,
needed to set the buck/ldo enable bit OFF
* @return Return 0 if ok, else -1
*/
static int max77686_enablereg(unsigned int bus, enum max77686_regnum reg, int enable)
{
struct max77686_para *pmic;
unsigned char read_data;
int ret;
pmic = &max77686_param[reg];
ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->reg_enaddr,
&read_data);
if (ret != 0) {
debug("max77686 i2c read failed.\n");
return -1;
}
if (enable == REG_DISABLE) {
clrbits_8(&read_data,
pmic->reg_enbitmask << pmic->reg_enbitpos);
} else {
clrsetbits_8(&read_data,
pmic->reg_enbitmask << pmic->reg_enbitpos,
pmic->reg_enbiton << pmic->reg_enbitpos);
}
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR,
pmic->reg_enaddr, read_data);
if (ret != 0) {
debug("max77686 i2c write failed.\n");
return -1;
}
return 0;
}
int max77686_volsetting(unsigned int bus, enum max77686_regnum reg,
unsigned int volt, int enable, int volt_units)
{
struct max77686_para *pmic;
unsigned char read_data;
int vol_level = 0;
int ret;
pmic = &max77686_param[reg];
if (pmic->vol_addr == 0) {
debug("not a voltage register.\n");
return -1;
}
ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->vol_addr, &read_data);
if (ret != 0) {
debug("max77686 i2c read failed.\n");
return -1;
}
if (volt_units == MAX77686_UV)
vol_level = volt - (u32)pmic->vol_min * 1000;
else
vol_level = (volt - (u32)pmic->vol_min) * 1000;
if (vol_level < 0) {
debug("Not a valid voltage level to set\n");
return -1;
}
vol_level /= (u32)pmic->vol_div;
clrsetbits_8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos,
vol_level << pmic->vol_bitpos);
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, pmic->vol_addr, read_data);
if (ret != 0) {
debug("max77686 i2c write failed.\n");
return -1;
}
ret = max77686_enablereg(bus, reg, enable);
if (ret != 0) {
debug("Failed to enable buck/ldo.\n");
return -1;
}
return 0;
}
int max77686_enable_32khz_cp(unsigned int bus)
{
return max77686_enablereg(bus, PMIC_EN32KHZ_CP, REG_ENABLE);
}
int max77686_disable_backup_batt(unsigned int bus)
{
unsigned char val;
int ret;
ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, REG_BBAT, &val);
if (ret) {
debug("max77686 i2c read failed\n");
return ret;
}
/* If we already have the correct values, exit */
if ((val & (BBAT_BBCVS_MASK | BBAT_BBCHOSTEN_MASK)) ==
BBAT_BBCVS_MASK)
return 0;
/* First disable charging */
val &= ~BBAT_BBCHOSTEN_MASK;
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
if (ret) {
debug("max77686 i2c write failed\n");
return -1;
}
/* Finally select 3.5V to minimize power consumption */
val |= BBAT_BBCVS_MASK;
ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
if (ret) {
debug("max77686 i2c write failed\n");
return -1;
}
return 0;
}
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