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