1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2014 Gateworks Corporation 4 * Author: Tim Harvey <tharvey@gateworks.com> 5 */ 6 7 #include <common.h> 8 #include <errno.h> 9 #include <i2c.h> 10 #include <malloc.h> 11 #include <asm/bitops.h> 12 13 #include "gsc.h" 14 #include "ventana_eeprom.h" 15 16 /* read ventana EEPROM, check for validity, and return baseboard type */ 17 int 18 read_eeprom(int bus, struct ventana_board_info *info) 19 { 20 int i; 21 int chksum; 22 char baseboard; 23 int type; 24 unsigned char *buf = (unsigned char *)info; 25 26 memset(info, 0, sizeof(*info)); 27 28 /* 29 * On a board with a missing/depleted backup battery for GSC, the 30 * board may be ready to probe the GSC before its firmware is 31 * running. We will wait here indefinately for the GSC/EEPROM. 32 */ 33 while (1) { 34 if (0 == i2c_set_bus_num(bus) && 35 0 == i2c_probe(GSC_EEPROM_ADDR)) 36 break; 37 mdelay(1); 38 } 39 40 /* read eeprom config section */ 41 if (gsc_i2c_read(GSC_EEPROM_ADDR, 0x00, 1, buf, sizeof(*info))) { 42 puts("EEPROM: Failed to read EEPROM\n"); 43 return GW_UNKNOWN; 44 } 45 46 /* sanity checks */ 47 if (info->model[0] != 'G' || info->model[1] != 'W') { 48 puts("EEPROM: Invalid Model in EEPROM\n"); 49 return GW_UNKNOWN; 50 } 51 52 /* validate checksum */ 53 for (chksum = 0, i = 0; i < sizeof(*info)-2; i++) 54 chksum += buf[i]; 55 if ((info->chksum[0] != chksum>>8) || 56 (info->chksum[1] != (chksum&0xff))) { 57 puts("EEPROM: Failed EEPROM checksum\n"); 58 return GW_UNKNOWN; 59 } 60 61 /* original GW5400-A prototype */ 62 baseboard = info->model[3]; 63 if (strncasecmp((const char *)info->model, "GW5400-A", 8) == 0) 64 baseboard = '0'; 65 66 type = GW_UNKNOWN; 67 switch (baseboard) { 68 case '0': /* original GW5400-A prototype */ 69 type = GW54proto; 70 break; 71 case '1': 72 type = GW51xx; 73 break; 74 case '2': 75 type = GW52xx; 76 break; 77 case '3': 78 type = GW53xx; 79 break; 80 case '4': 81 type = GW54xx; 82 break; 83 case '5': 84 if (info->model[4] == '1') { 85 type = GW551x; 86 break; 87 } else if (info->model[4] == '2') { 88 type = GW552x; 89 break; 90 } else if (info->model[4] == '3') { 91 type = GW553x; 92 break; 93 } 94 break; 95 case '6': 96 if (info->model[4] == '0') 97 type = GW560x; 98 break; 99 case '9': 100 if (info->model[4] == '0' && info->model[5] == '3') 101 type = GW5903; 102 if (info->model[4] == '0' && info->model[5] == '4') 103 type = GW5904; 104 break; 105 } 106 return type; 107 } 108 109 /* list of config bits that the bootloader will remove from dtb if not set */ 110 struct ventana_eeprom_config econfig[] = { 111 { "eth0", "ethernet0", EECONFIG_ETH0 }, 112 { "usb0", NULL, EECONFIG_USB0 }, 113 { "usb1", NULL, EECONFIG_USB1 }, 114 { "mmc0", NULL, EECONFIG_SD0 }, 115 { "mmc1", NULL, EECONFIG_SD1 }, 116 { "mmc2", NULL, EECONFIG_SD2 }, 117 { "mmc3", NULL, EECONFIG_SD3 }, 118 { /* Sentinel */ } 119 }; 120 121 #if defined(CONFIG_CMD_EECONFIG) && !defined(CONFIG_SPL_BUILD) 122 static struct ventana_eeprom_config *get_config(const char *name) 123 { 124 struct ventana_eeprom_config *cfg = econfig; 125 126 while (cfg->name) { 127 if (0 == strcmp(name, cfg->name)) 128 return cfg; 129 cfg++; 130 } 131 return NULL; 132 } 133 134 static u8 econfig_bytes[sizeof(ventana_info.config)]; 135 static int econfig_init = -1; 136 137 static int do_econfig(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 138 { 139 struct ventana_eeprom_config *cfg; 140 struct ventana_board_info *info = &ventana_info; 141 int i; 142 143 if (argc < 2) 144 return CMD_RET_USAGE; 145 146 /* initialize */ 147 if (econfig_init != 1) { 148 memcpy(econfig_bytes, info->config, sizeof(econfig_bytes)); 149 econfig_init = 1; 150 } 151 152 /* list configs */ 153 if ((strncmp(argv[1], "list", 4) == 0)) { 154 cfg = econfig; 155 while (cfg->name) { 156 printf("%s: %d\n", cfg->name, 157 test_bit(cfg->bit, econfig_bytes) ? 1 : 0); 158 cfg++; 159 } 160 } 161 162 /* save */ 163 else if ((strncmp(argv[1], "save", 4) == 0)) { 164 unsigned char *buf = (unsigned char *)info; 165 int chksum; 166 167 /* calculate new checksum */ 168 memcpy(info->config, econfig_bytes, sizeof(econfig_bytes)); 169 for (chksum = 0, i = 0; i < sizeof(*info)-2; i++) 170 chksum += buf[i]; 171 debug("old chksum:0x%04x\n", 172 (info->chksum[0] << 8) | info->chksum[1]); 173 debug("new chksum:0x%04x\n", chksum); 174 info->chksum[0] = chksum >> 8; 175 info->chksum[1] = chksum & 0xff; 176 177 /* write new config data */ 178 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->config - (u8 *)info, 179 1, econfig_bytes, sizeof(econfig_bytes))) { 180 printf("EEPROM: Failed updating config\n"); 181 return CMD_RET_FAILURE; 182 } 183 184 /* write new config data */ 185 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->chksum - (u8 *)info, 186 1, info->chksum, 2)) { 187 printf("EEPROM: Failed updating checksum\n"); 188 return CMD_RET_FAILURE; 189 } 190 191 printf("Config saved to EEPROM\n"); 192 } 193 194 /* get config */ 195 else if (argc == 2) { 196 cfg = get_config(argv[1]); 197 if (cfg) { 198 printf("%s: %d\n", cfg->name, 199 test_bit(cfg->bit, econfig_bytes) ? 1 : 0); 200 } else { 201 printf("invalid config: %s\n", argv[1]); 202 return CMD_RET_FAILURE; 203 } 204 } 205 206 /* set config */ 207 else if (argc == 3) { 208 cfg = get_config(argv[1]); 209 if (cfg) { 210 if (simple_strtol(argv[2], NULL, 10)) { 211 test_and_set_bit(cfg->bit, econfig_bytes); 212 printf("Enabled %s\n", cfg->name); 213 } else { 214 test_and_clear_bit(cfg->bit, econfig_bytes); 215 printf("Disabled %s\n", cfg->name); 216 } 217 } else { 218 printf("invalid config: %s\n", argv[1]); 219 return CMD_RET_FAILURE; 220 } 221 } 222 223 else 224 return CMD_RET_USAGE; 225 226 return CMD_RET_SUCCESS; 227 } 228 229 U_BOOT_CMD( 230 econfig, 3, 0, do_econfig, 231 "EEPROM configuration", 232 "list - list config\n" 233 "save - save config to EEPROM\n" 234 "<name> - get config 'name'\n" 235 "<name> [0|1] - set config 'name' to value\n" 236 ); 237 238 #endif /* CONFIG_CMD_EECONFIG */ 239