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 <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 */