board/gateworks/gw_ventana/eeprom.c

   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 <command.h>
   9 #include <errno.h>
  10 #include <hexdump.h>
  11 #include <i2c.h>
  12 #include <log.h>
  13 #include <malloc.h>
  14 #include <asm/bitops.h>
  15
  16 #include "gsc.h"
  17 #include "ventana_eeprom.h"
  18
  19 /* read ventana EEPROM, check for validity, and return baseboard type */
  20 int
  21 read_eeprom(int bus, struct ventana_board_info *info)
  22 {
  23         int i;
  24         int chksum;
  25         char baseboard;
  26         int type;
  27         unsigned char *buf = (unsigned char *)info;
  28
  29         memset(info, 0, sizeof(*info));
  30
  31         /*
  32          * On a board with a missing/depleted backup battery for GSC, the
  33          * board may be ready to probe the GSC before its firmware is
  34          * running.  We will wait here indefinately for the GSC/EEPROM.
  35          */
  36         while (1) {
  37                 if (0 == i2c_set_bus_num(bus) &&
  38                     0 == i2c_probe(GSC_EEPROM_ADDR))
  39                         break;
  40                 mdelay(1);
  41         }
  42
  43         /* read eeprom config section */
  44         if (gsc_i2c_read(GSC_EEPROM_ADDR, 0x00, 1, buf, sizeof(*info))) {
  45                 puts("EEPROM: Failed to read EEPROM\n");
  46                 return GW_UNKNOWN;
  47         }
  48
  49         /* sanity checks */
  50         if (info->model[0] != 'G' || info->model[1] != 'W') {
  51                 puts("EEPROM: Invalid Model in EEPROM\n");
  52                 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf,
  53                                      sizeof(*info));
  54                 return GW_UNKNOWN;
  55         }
  56
  57         /* validate checksum */
  58         for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
  59                 chksum += buf[i];
  60         if ((info->chksum[0] != chksum>>8) ||
  61             (info->chksum[1] != (chksum&0xff))) {
  62                 puts("EEPROM: Failed EEPROM checksum\n");
  63                 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf,
  64                                      sizeof(*info));
  65                 return GW_UNKNOWN;
  66         }
  67
  68         /* original GW5400-A prototype */
  69         baseboard = info->model[3];
  70         if (strncasecmp((const char *)info->model, "GW5400-A", 8) == 0)
  71                 baseboard = '0';
  72
  73         type = GW_UNKNOWN;
  74         switch (baseboard) {
  75         case '0': /* original GW5400-A prototype */
  76                 type = GW54proto;
  77                 break;
  78         case '1':
  79                 type = GW51xx;
  80                 break;
  81         case '2':
  82                 type = GW52xx;
  83                 break;
  84         case '3':
  85                 type = GW53xx;
  86                 break;
  87         case '4':
  88                 type = GW54xx;
  89                 break;
  90         case '5':
  91                 if (info->model[4] == '1') {
  92                         type = GW551x;
  93                         break;
  94                 } else if (info->model[4] == '2') {
  95                         type = GW552x;
  96                         break;
  97                 } else if (info->model[4] == '3') {
  98                         type = GW553x;
  99                         break;
 100                 }
 101                 break;
 102         case '6':
 103                 if (info->model[4] == '0')
 104                         type = GW560x;
 105                 break;
 106         case '9':
 107                 if (info->model[4] == '0' && info->model[5] == '1')
 108                         type = GW5901;
 109                 else if (info->model[4] == '0' && info->model[5] == '2')
 110                         type = GW5902;
 111                 else if (info->model[4] == '0' && info->model[5] == '3')
 112                         type = GW5903;
 113                 else if (info->model[4] == '0' && info->model[5] == '4')
 114                         type = GW5904;
 115                 else if (info->model[4] == '0' && info->model[5] == '5')
 116                         type = GW5905;
 117                 else if (info->model[4] == '0' && info->model[5] == '6')
 118                         type = GW5906;
 119                 else if (info->model[4] == '0' && info->model[5] == '7')
 120                         type = GW5907;
 121                 else if (info->model[4] == '0' && info->model[5] == '8')
 122                         type = GW5908;
 123                 else if (info->model[4] == '0' && info->model[5] == '9')
 124                         type = GW5909;
 125                 break;
 126         default:
 127                 printf("EEPROM: Unknown model in EEPROM: %s\n", info->model);
 128                 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf,
 129                                      sizeof(*info));
 130                 break;
 131         }
 132         return type;
 133 }
 134
 135 /* list of config bits that the bootloader will remove from dtb if not set */
 136 struct ventana_eeprom_config econfig[] = {
 137         { "eth0", "ethernet0", EECONFIG_ETH0 },
 138         { "usb0", NULL, EECONFIG_USB0 },
 139         { "usb1", NULL, EECONFIG_USB1 },
 140         { "mmc0", NULL, EECONFIG_SD0 },
 141         { "mmc1", NULL, EECONFIG_SD1 },
 142         { "mmc2", NULL, EECONFIG_SD2 },
 143         { "mmc3", NULL, EECONFIG_SD3 },
 144         { /* Sentinel */ }
 145 };
 146
 147 #if defined(CONFIG_CMD_EECONFIG) && !defined(CONFIG_SPL_BUILD)
 148 static struct ventana_eeprom_config *get_config(const char *name)
 149 {
 150         struct ventana_eeprom_config *cfg = econfig;
 151
 152         while (cfg->name) {
 153                 if (0 == strcmp(name, cfg->name))
 154                         return cfg;
 155                 cfg++;
 156         }
 157         return NULL;
 158 }
 159
 160 static u8 econfig_bytes[sizeof(ventana_info.config)];
 161 static int econfig_init = -1;
 162
 163 static int do_econfig(struct cmd_tbl *cmdtp, int flag, int argc,
 164                       char *const argv[])
 165 {
 166         struct ventana_eeprom_config *cfg;
 167         struct ventana_board_info *info = &ventana_info;
 168         int i;
 169
 170         if (argc < 2)
 171                 return CMD_RET_USAGE;
 172
 173         /* initialize */
 174         if (econfig_init != 1) {
 175                 memcpy(econfig_bytes, info->config, sizeof(econfig_bytes));
 176                 econfig_init = 1;
 177         }
 178
 179         /* list configs */
 180         if ((strncmp(argv[1], "list", 4) == 0)) {
 181                 cfg = econfig;
 182                 while (cfg->name) {
 183                         printf("%s: %d\n", cfg->name,
 184                                test_bit(cfg->bit, econfig_bytes) ?  1 : 0);
 185                         cfg++;
 186                 }
 187         }
 188
 189         /* save */
 190         else if ((strncmp(argv[1], "save", 4) == 0)) {
 191                 unsigned char *buf = (unsigned char *)info;
 192                 int chksum;
 193
 194                 /* calculate new checksum */
 195                 memcpy(info->config, econfig_bytes, sizeof(econfig_bytes));
 196                 for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
 197                         chksum += buf[i];
 198                 debug("old chksum:0x%04x\n",
 199                       (info->chksum[0] << 8) | info->chksum[1]);
 200                 debug("new chksum:0x%04x\n", chksum);
 201                 info->chksum[0] = chksum >> 8;
 202                 info->chksum[1] = chksum & 0xff;
 203
 204                 /* write new config data */
 205                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->config - (u8 *)info,
 206                                   1, econfig_bytes, sizeof(econfig_bytes))) {
 207                         printf("EEPROM: Failed updating config\n");
 208                         return CMD_RET_FAILURE;
 209                 }
 210
 211                 /* write new config data */
 212                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->chksum - (u8 *)info,
 213                                   1, info->chksum, 2)) {
 214                         printf("EEPROM: Failed updating checksum\n");
 215                         return CMD_RET_FAILURE;
 216                 }
 217
 218                 printf("Config saved to EEPROM\n");
 219         }
 220
 221         /* get config */
 222         else if (argc == 2) {
 223                 cfg = get_config(argv[1]);
 224                 if (cfg) {
 225                         printf("%s: %d\n", cfg->name,
 226                                test_bit(cfg->bit, econfig_bytes) ? 1 : 0);
 227                 } else {
 228                         printf("invalid config: %s\n", argv[1]);
 229                         return CMD_RET_FAILURE;
 230                 }
 231         }
 232
 233         /* set config */
 234         else if (argc == 3) {
 235                 cfg = get_config(argv[1]);
 236                 if (cfg) {
 237                         if (simple_strtol(argv[2], NULL, 10)) {
 238                                 test_and_set_bit(cfg->bit, econfig_bytes);
 239                                 printf("Enabled %s\n", cfg->name);
 240                         } else {
 241                                 test_and_clear_bit(cfg->bit, econfig_bytes);
 242                                 printf("Disabled %s\n", cfg->name);
 243                         }
 244                 } else {
 245                         printf("invalid config: %s\n", argv[1]);
 246                         return CMD_RET_FAILURE;
 247                 }
 248         }
 249
 250         else
 251                 return CMD_RET_USAGE;
 252
 253         return CMD_RET_SUCCESS;
 254 }
 255
 256 U_BOOT_CMD(
 257         econfig, 3, 0, do_econfig,
 258         "EEPROM configuration",
 259         "list - list config\n"
 260         "save - save config to EEPROM\n"
 261         "<name> - get config 'name'\n"
 262         "<name> [0|1] - set config 'name' to value\n"
 263 );
 264
 265 #endif /* CONFIG_CMD_EECONFIG */