1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2013 Freescale Semiconductor, Inc. 4 */ 5 6 /* Power-One ZM7300 DPM */ 7 #include "zm7300.h" 8 9 #define DPM_WP 0x96 10 #define WRP_OPCODE 0x01 11 #define WRM_OPCODE 0x02 12 #define RRP_OPCODE 0x11 13 14 #define DPM_SUCCESS 0x01 15 #define DPM_EXEC_FAIL 0x00 16 17 static const uint16_t hex_to_1_10mv[] = { 18 5000, 19 5125, 20 5250, 21 5375, 22 5500, 23 5625, 24 5750, 25 5875, 26 6000, 27 6125, 28 6250, 29 6375, 30 6500, 31 6625, 32 6750, 33 6875, 34 7000, 35 7125, 36 7250, 37 7375, 38 7500, 39 7625, 40 7750, 41 7875, 42 8000, 43 8125, 44 8250, 45 8375, 46 8500, 47 8625, 48 8750, 49 8875, 50 9000, 51 9125, 52 9250, 53 9375, 54 9500, /* 0.95mV */ 55 9625, 56 9750, 57 9875, 58 10000, /* 1.0V */ 59 10125, 60 10250, 61 10375, 62 10500, 63 10625, 64 10750, 65 10875, 66 11000, 67 11125, 68 11250, 69 11375, 70 11500, 71 11625, 72 11750, 73 11875, 74 12000, 75 12125, 76 12250, 77 12375, 78 0, /* reserved */ 79 }; 80 81 82 /* Read Data d from Register r of POL p */ 83 u8 dpm_rrp(uchar r) 84 { 85 u8 ret[5]; 86 87 ret[0] = RRP_OPCODE; 88 /* POL is 0 */ 89 ret[1] = 0; 90 ret[2] = r; 91 i2c_read(I2C_DPM_ADDR, 0, -3, ret, 2); 92 if (ret[1] == DPM_SUCCESS) { /* the DPM returned success as status */ 93 debug("RRP_OPCODE returned success data is %x\n", ret[0]); 94 return ret[0]; 95 } else { 96 return -1; 97 } 98 } 99 100 /* Write Data d into DPM register r (RAM) */ 101 int dpm_wrm(u8 r, u8 d) 102 { 103 u8 ret[5]; 104 105 ret[0] = WRM_OPCODE; 106 ret[1] = r; 107 ret[2] = d; 108 i2c_read(I2C_DPM_ADDR, 0, -3, ret, 1); 109 if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */ 110 debug("WRM_OPCODE returned success data is %x\n", ret[0]); 111 return ret[0]; 112 } else { 113 return -1; 114 } 115 } 116 117 /* Write Data d into Register r of POL(s) a */ 118 int dpm_wrp(u8 r, u8 d) 119 { 120 u8 ret[7]; 121 122 ret[0] = WRP_OPCODE; 123 /* only POL0 is present */ 124 ret[1] = 0x01; 125 ret[2] = 0x00; 126 ret[3] = 0x00; 127 ret[4] = 0x00; 128 ret[5] = r; 129 ret[6] = d; 130 i2c_read(I2C_DPM_ADDR, 0, -7, ret, 1); 131 if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */ 132 debug("WRP_OPCODE returned success data is %x\n", ret[0]); 133 return 0; 134 } else { 135 return -1; 136 } 137 } 138 139 /* Uses the DPM command RRP */ 140 u8 zm_read(uchar reg) 141 { 142 return dpm_rrp(reg); 143 } 144 145 /* ZM_write -- 146 Steps: 147 a. Write data to the register 148 b. Read data from register and compare to written value 149 c. Return return_code & voltage_read 150 */ 151 u8 zm_write(u8 reg, u8 data) 152 { 153 u8 d; 154 155 /* write data to register */ 156 dpm_wrp(reg, data); 157 158 /* read register and compare to written value */ 159 d = dpm_rrp(reg); 160 if (d != data) { 161 printf("zm_write : Comparison register data failed\n"); 162 return -1; 163 } 164 165 return d; 166 } 167 168 /* zm_write_out_voltage 169 * voltage in 1/10 mV 170 */ 171 int zm_write_voltage(int voltage) 172 { 173 u8 reg = 0x7, vid; 174 uint16_t voltage_read; 175 u8 ret; 176 177 vid = (voltage - 5000) / ZM_STEP; 178 179 ret = zm_write(reg, vid); 180 if (ret != -1) { 181 voltage_read = hex_to_1_10mv[ret]; 182 debug("voltage set to %dmV\n", voltage_read/10); 183 return voltage_read; 184 } 185 return -1; 186 } 187 188 /* zm_read_out_voltage 189 * voltage in 1/10 mV 190 */ 191 int zm_read_voltage(void) 192 { 193 u8 reg = 0x7; 194 u8 ret; 195 int voltage; 196 197 ret = zm_read(reg); 198 if (ret != -1) { 199 voltage = hex_to_1_10mv[ret]; 200 debug("Voltage read is %dmV\n", voltage/10); 201 return voltage; 202 } else { 203 return -1; 204 } 205 } 206 207 int zm_disable_wp() 208 { 209 u8 new_wp_value; 210 211 /* Disable using Write-Protect register 0x96 */ 212 new_wp_value = 0x8; 213 if ((dpm_wrm(DPM_WP, new_wp_value)) < 0) { 214 printf("Disable Write-Protect register failed\n"); 215 return -1; 216 } 217 return 0; 218 } 219 220 int zm_enable_wp() 221 { 222 u8 orig_wp_value; 223 orig_wp_value = 0x0; 224 225 /* Enable using Write-Protect register 0x96 */ 226 if ((dpm_wrm(DPM_WP, orig_wp_value)) < 0) { 227 printf("Enable Write-Protect register failed\n"); 228 return -1; 229 } 230 return 0; 231 } 232 233
