1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2011-2013 4 * Texas Instruments, <www.ti.com> 5 */ 6 7 #include <common.h> 8 #include <i2c.h> 9 #include <power/tps65910.h> 10 11 struct udevice *tps65910_dev __attribute__((section(".data"))) = NULL; 12 13 static inline int tps65910_read_reg(int addr, uchar *buf) 14 { 15 #ifndef CONFIG_DM_I2C 16 return i2c_read(TPS65910_CTRL_I2C_ADDR, addr, 1, buf, 1); 17 #else 18 int rc; 19 20 rc = dm_i2c_reg_read(tps65910_dev, addr); 21 if (rc < 0) 22 return rc; 23 *buf = (uchar)rc; 24 return 0; 25 #endif 26 } 27 28 static inline int tps65910_write_reg(int addr, uchar *buf) 29 { 30 #ifndef CONFIG_DM_I2C 31 return i2c_write(TPS65910_CTRL_I2C_ADDR, addr, 1, buf, 1); 32 #else 33 return dm_i2c_reg_write(tps65910_dev, addr, *buf); 34 #endif 35 } 36 37 int power_tps65910_init(unsigned char bus) 38 { 39 #ifdef CONFIG_DM_I2C 40 struct udevice *dev = NULL; 41 int rc; 42 43 rc = i2c_get_chip_for_busnum(bus, TPS65910_CTRL_I2C_ADDR, 1, &dev); 44 45 if (rc) 46 return rc; 47 tps65910_dev = dev; 48 #endif 49 return 0; 50 } 51 52 /* 53 * tps65910_set_i2c_control() - Set the TPS65910 to be controlled via the I2C 54 * interface. 55 * @return: 0 on success, not 0 on failure 56 */ 57 int tps65910_set_i2c_control(void) 58 { 59 int ret; 60 uchar buf; 61 62 /* VDD1/2 voltage selection register access by control i/f */ 63 ret = tps65910_read_reg(TPS65910_DEVCTRL_REG, &buf); 64 65 if (ret) 66 return ret; 67 68 buf |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C; 69 70 return tps65910_write_reg(TPS65910_DEVCTRL_REG, &buf); 71 } 72 73 /* 74 * tps65910_voltage_update() - Voltage switching for MPU frequency switching. 75 * @module: mpu - 0, core - 1 76 * @vddx_op_vol_sel: vdd voltage to set 77 * @return: 0 on success, not 0 on failure 78 */ 79 int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel) 80 { 81 uchar buf; 82 unsigned int reg_offset; 83 int ret; 84 85 if (module == MPU) 86 reg_offset = TPS65910_VDD1_OP_REG; 87 else 88 reg_offset = TPS65910_VDD2_OP_REG; 89 90 /* Select VDDx OP */ 91 ret = tps65910_read_reg(reg_offset, &buf); 92 if (ret) 93 return ret; 94 95 buf &= ~TPS65910_OP_REG_CMD_MASK; 96 97 ret = tps65910_write_reg(reg_offset, &buf); 98 if (ret) 99 return ret; 100 101 /* Configure VDDx OP Voltage */ 102 ret = tps65910_read_reg(reg_offset, &buf); 103 if (ret) 104 return ret; 105 106 buf &= ~TPS65910_OP_REG_SEL_MASK; 107 buf |= vddx_op_vol_sel; 108 109 ret = tps65910_write_reg(reg_offset, &buf); 110 if (ret) 111 return ret; 112 113 ret = tps65910_read_reg(reg_offset, &buf); 114 if (ret) 115 return ret; 116 117 if ((buf & TPS65910_OP_REG_SEL_MASK) != vddx_op_vol_sel) 118 return 1; 119 120 return 0; 121 } 122