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