diff options
Diffstat (limited to 'src/drivers/maxim/max77686/max77686.c')
| -rw-r--r-- | src/drivers/maxim/max77686/max77686.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/drivers/maxim/max77686/max77686.c b/src/drivers/maxim/max77686/max77686.c new file mode 100644 index 0000000000..8fbcb8fb31 --- /dev/null +++ b/src/drivers/maxim/max77686/max77686.c @@ -0,0 +1,257 @@ +/* + * 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 <common.h> +#include <smbus.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[] = {/*{regnum, 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 char chip_addr, + unsigned int reg, unsigned char val) +{ + return i2c_write(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 char chip_addr, + unsigned int reg, unsigned char *val) +{ + return i2c_read(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(enum max77686_regnum reg, int enable) +{ + struct max77686_para *pmic; + unsigned char read_data; + int ret; + + pmic = &max77686_param[reg]; + + ret = max77686_i2c_read(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(MAX77686_I2C_ADDR, + pmic->reg_enaddr, read_data); + if (ret != 0) { + debug("max77686 i2c write failed.\n"); + return -1; + } + + return 0; +} + +static int max77686_do_volsetting(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(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 - pmic->vol_min * 1000; + else + vol_level = (volt - pmic->vol_min) * 1000; + + if (vol_level < 0) { + debug("Not a valid voltage level to set\n"); + return -1; + } + vol_level /= pmic->vol_div; + + clrsetbits_8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos, + vol_level << pmic->vol_bitpos); + + ret = max77686_i2c_write(MAX77686_I2C_ADDR, pmic->vol_addr, read_data); + if (ret != 0) { + debug("max77686 i2c write failed.\n"); + return -1; + } + + ret = max77686_enablereg(reg, enable); + if (ret != 0) { + debug("Failed to enable buck/ldo.\n"); + return -1; + } + + return 0; +} + +int max77686_volsetting(enum max77686_regnum reg, unsigned int volt, + int enable, int volt_units) +{ + int old_bus = i2c_get_bus_num(); + int ret; + + i2c_set_bus_num(0); + ret = max77686_do_volsetting(reg, volt, enable, volt_units); + i2c_set_bus_num(old_bus); + return ret; +} + +int max77686_enable_32khz_cp(void) +{ + i2c_set_bus_num(0); + return max77686_enablereg(PMIC_EN32KHZ_CP, REG_ENABLE); +} + +int max77686_disable_backup_batt(void) +{ + unsigned char val; + int ret; + + i2c_set_bus_num(0); + ret = max77686_i2c_read(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(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(MAX77686_I2C_ADDR, REG_BBAT, val); + if (ret) { + debug("max77686 i2c write failed\n"); + return -1; + } + + return 0; +} |