| Philip, Avinash | 09ee9e8 | 2013-08-30 16:28:43 -0400 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2011-2013 |
| 3 | * Texas Instruments, <www.ti.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <i2c.h> |
| 10 | #include <power/tps65910.h> |
| 11 | |
| 12 | /* |
| 13 | * tps65910_set_i2c_control() - Set the TPS65910 to be controlled via the I2C |
| 14 | * interface. |
| 15 | * @return: 0 on success, not 0 on failure |
| 16 | */ |
| 17 | int tps65910_set_i2c_control(void) |
| 18 | { |
| 19 | int ret; |
| 20 | uchar buf; |
| 21 | |
| 22 | /* VDD1/2 voltage selection register access by control i/f */ |
| 23 | ret = i2c_read(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1, |
| 24 | &buf, 1); |
| 25 | |
| 26 | if (ret) |
| 27 | return ret; |
| 28 | |
| 29 | buf |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C; |
| 30 | |
| 31 | return i2c_write(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1, |
| 32 | &buf, 1); |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | * tps65910_voltage_update() - Voltage switching for MPU frequency switching. |
| 37 | * @module: mpu - 0, core - 1 |
| 38 | * @vddx_op_vol_sel: vdd voltage to set |
| 39 | * @return: 0 on success, not 0 on failure |
| 40 | */ |
| 41 | int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel) |
| 42 | { |
| 43 | uchar buf; |
| 44 | unsigned int reg_offset; |
| 45 | int ret; |
| 46 | |
| 47 | if (module == MPU) |
| 48 | reg_offset = TPS65910_VDD1_OP_REG; |
| 49 | else |
| 50 | reg_offset = TPS65910_VDD2_OP_REG; |
| 51 | |
| 52 | /* Select VDDx OP */ |
| 53 | ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); |
| 54 | if (ret) |
| 55 | return ret; |
| 56 | |
| 57 | buf &= ~TPS65910_OP_REG_CMD_MASK; |
| 58 | |
| 59 | ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); |
| 60 | if (ret) |
| 61 | return ret; |
| 62 | |
| 63 | /* Configure VDDx OP Voltage */ |
| 64 | ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); |
| 65 | if (ret) |
| 66 | return ret; |
| 67 | |
| 68 | buf &= ~TPS65910_OP_REG_SEL_MASK; |
| 69 | buf |= vddx_op_vol_sel; |
| 70 | |
| 71 | ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); |
| 72 | if (ret) |
| 73 | return ret; |
| 74 | |
| 75 | ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); |
| 76 | if (ret) |
| 77 | return ret; |
| 78 | |
| 79 | if ((buf & TPS65910_OP_REG_SEL_MASK) != vddx_op_vol_sel) |
| 80 | return 1; |
| 81 | |
| 82 | return 0; |
| 83 | } |