| /* |
| * Driver for X-Powers AXP 209 Power Management Unit |
| * |
| * Despite axp209_read/write only working on a byte at a time, there is no such |
| * limitation in the AXP209. |
| * |
| * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
| * Subject to the GNU GPL v2, or (at your option) any later version. |
| */ |
| |
| #include "axp209.h" |
| |
| #include <device/i2c.h> |
| |
| /* Hide these definitions from the rest of the source, so keep them here */ |
| enum registers { |
| REG_POWER_STATUS = 0x00, |
| REG_POWER_MODE = 0x01, |
| REG_OTG_VBUS = 0x02, |
| REG_CHIP_ID = 0x03, |
| REG_CHIP_PWROUT_CTL = 0x12, |
| REG_DCDC2_VOLTAGE = 0x23, |
| REG_DCDC2_LDO3_CTL = 0x25, |
| REG_DCDC3_VOLTAGE = 0x27, |
| REG_LDO24_VOLTAGE = 0x28, |
| REG_LDO3_VOLTAGE = 0x29, |
| REG_VBUS_IPSOUT = 0x30, |
| REG_PWROFF_VOLTAGE = 0x31, |
| REG_SHTDWN_SETTING = 0x32, |
| }; |
| |
| /* REG_LDO24_VOLTAGE definitions */ |
| #define REG_LDO24_VOLTAGE_LDO2_MASK (0xf << 4) |
| #define REG_LDO24_VOLTAGE_LDO2_VAL(x) ((x << 4) & REG_LDO24_VOLTAGE_LDO2_MASK) |
| #define REG_LDO24_VOLTAGE_LDO4_MASK (0xf << 0) |
| #define REG_LDO24_VOLTAGE_LDO4_VAL(x) ((x << 0) & REG_LDO24_VOLTAGE_LDO4_MASK) |
| |
| /* |
| * Read and write accessors. We only work on one register at a time, but there |
| * is no limitation on the AXP209 as to how many registers we may read or write |
| * in one transaction. |
| * These return the number of bytes read/written, or an error code. In this |
| * case, they return 1 on success, or an error code otherwise. |
| */ |
| static int axp209_read(u8 bus, u8 reg, u8 *val) |
| { |
| return i2c_read(bus, AXP209_I2C_ADDR, reg, 1, val, 1); |
| } |
| |
| static int axp209_write(u8 bus, u8 reg, u8 val) |
| { |
| return i2c_write(bus, AXP209_I2C_ADDR, reg, 1, &val, 1); |
| } |
| |
| /** |
| * \brief Identify and initialize an AXP209 on the I²C bus |
| * |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on if an AXP209 is found, or an error code otherwise. |
| */ |
| enum cb_err axp209_init(u8 bus) |
| { |
| u8 id; |
| |
| if (axp209_read(bus, REG_CHIP_ID, &id) != 1) |
| return CB_ERR; |
| |
| /* From U-Boot code : Low 4 bits is chip version */ |
| if ((id & 0x0f) != 0x1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /** |
| * \brief Configure the output voltage of DC-DC2 converter |
| * |
| * If the requested voltage is not available, the next lowest voltage will |
| * be applied. |
| * Valid values are between 700mV and 2275mV |
| * |
| * @param[in] millivolts voltage in mV units. |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on success, |
| * CB_ERR_ARG if voltage is out of range, or an error code otherwise. |
| */ |
| enum cb_err axp209_set_dcdc2_voltage(u8 bus, u16 millivolts) |
| { |
| u8 val; |
| |
| if (millivolts < 700 || millivolts > 2275) |
| return CB_ERR_ARG; |
| |
| val = (millivolts - 700) / 25; |
| |
| if (axp209_write(bus, REG_DCDC2_VOLTAGE, val) != 1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /** |
| * \brief Configure the output voltage of DC-DC3 converter |
| * |
| * If the requested voltage is not available, the next lowest voltage will |
| * be applied. |
| * Valid values are between 700mV and 3500mV |
| * |
| * @param[in] millivolts voltage in mV units. |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on success, |
| * CB_ERR_ARG if voltage is out of range, or an error code otherwise. |
| */ |
| enum cb_err axp209_set_dcdc3_voltage(u8 bus, u16 millivolts) |
| { |
| u8 val; |
| |
| if (millivolts < 700 || millivolts > 3500) |
| return CB_ERR_ARG; |
| |
| val = (millivolts - 700) / 25; |
| |
| if (axp209_write(bus, REG_DCDC3_VOLTAGE, val) != 1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /** |
| * \brief Configure the output voltage of LDO2 regulator |
| * |
| * If the requested voltage is not available, the next lowest voltage will |
| * be applied. |
| * Valid values are between 700mV and 3300mV |
| * |
| * @param[in] millivolts voltage in mV units. |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on success, |
| * CB_ERR_ARG if voltage is out of range, or an error code otherwise. |
| */ |
| enum cb_err axp209_set_ldo2_voltage(u8 bus, u16 millivolts) |
| { |
| u8 reg8, val; |
| |
| if (millivolts < 1800 || millivolts > 3300) |
| return CB_ERR_ARG; |
| |
| /* Try to read the register first, and stop here on error */ |
| if (axp209_read(bus, REG_LDO24_VOLTAGE, ®8) != 1) |
| return CB_ERR; |
| |
| val = (millivolts - 1800) / 100; |
| reg8 &= ~REG_LDO24_VOLTAGE_LDO2_MASK; |
| reg8 |= REG_LDO24_VOLTAGE_LDO2_VAL(val); |
| |
| if (axp209_write(bus, REG_LDO24_VOLTAGE, reg8) != 1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /** |
| * \brief Configure the output voltage of LDO4 regulator |
| * |
| * If the requested voltage is not available, the next lowest voltage will |
| * be applied. |
| * Valid values are between 700mV and 3500mV. Datasheet lists maximum voltage at |
| * 2250mV, but hardware samples go as high as 3500mV. |
| * |
| * @param[in] millivolts voltage in mV units. |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on success, |
| * CB_ERR_ARG if voltage is out of range, or an error code otherwise. |
| */ |
| enum cb_err axp209_set_ldo3_voltage(u8 bus, u16 millivolts) |
| { |
| u8 val; |
| |
| /* Datasheet lists 2250 max, but PMU will output up to 3500mV */ |
| if (millivolts < 700 || millivolts > 3500) |
| return CB_ERR_ARG; |
| |
| val = (millivolts - 700) / 25; |
| |
| if (axp209_write(bus, REG_LDO3_VOLTAGE, val) != 1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /** |
| * \brief Configure the output voltage of DC-DC2 converter |
| * |
| * If the requested voltage is not available, the next lowest voltage will |
| * be applied. |
| * Valid values are between 1250V and 3300mV |
| * |
| * @param[in] millivolts voltage in mV units. |
| * @param[in] bus I²C bus to which the AXP209 is connected |
| * @return CB_SUCCES on success, |
| * CB_ERR_ARG if voltage is out of range, or an error code otherwise. |
| */ |
| enum cb_err axp209_set_ldo4_voltage(u8 bus, u16 millivolts) |
| { |
| u8 reg8, val; |
| |
| if (millivolts < 1250 || millivolts > 3300) |
| return CB_ERR_ARG; |
| |
| /* Try to read the register first, and stop here on error */ |
| if (axp209_read(bus, REG_LDO24_VOLTAGE, ®8) != 1) |
| return CB_ERR; |
| |
| if (millivolts <= 2000) |
| val = (millivolts - 1200) / 100; |
| else if (millivolts <= 2700) |
| val = 9 + (millivolts - 2500) / 100; |
| else if (millivolts <= 2800) |
| val = 11; |
| else |
| val = 12 + (millivolts - 3000) / 100; |
| |
| reg8 &= ~REG_LDO24_VOLTAGE_LDO4_MASK; |
| reg8 |= REG_LDO24_VOLTAGE_LDO4_VAL(val); |
| |
| if (axp209_write(bus, REG_LDO24_VOLTAGE, reg8) != 1) |
| return CB_ERR; |
| |
| return CB_SUCCESS; |
| } |