board/gateworks/gw_ventana/eeprom.c

   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         type = GW_UNKNOWN;
  68         switch (baseboard) {
  69         case '0': /* original GW5400-A prototype */
  70                 type = GW54proto;
  71                 break;
  72         case '1':
  73                 type = GW51xx;
  74                 break;
  75         case '2':
  76                 type = GW52xx;
  77                 break;
  78         case '3':
  79                 type = GW53xx;
  80                 break;
  81         case '4':
  82                 type = GW54xx;
  83                 break;
  84         case '5':
  85                 if (info->model[4] == '1') {
  86                         type = GW551x;
  87                         break;
  88                 } else if (info->model[4] == '2') {
  89                         type = GW552x;
  90                         break;
  91                 } else if (info->model[4] == '3') {
  92                         type = GW553x;
  93                         break;
  94                 }
  95                 break;
  96         case '9':
  97                 if (info->model[4] == '0' && info->model[5] == '4')
  98                         type = GW5904;
  99                 break;
 100         }
 101         return type;
 102 }
 103
 104 /* list of config bits that the bootloader will remove from dtb if not set */
 105 struct ventana_eeprom_config econfig[] = {
 106         { "eth0", "ethernet0", EECONFIG_ETH0 },
 107         { "usb0", NULL, EECONFIG_USB0 },
 108         { "usb1", NULL, EECONFIG_USB1 },
 109         { "mmc0", NULL, EECONFIG_SD0 },
 110         { "mmc1", NULL, EECONFIG_SD1 },
 111         { "mmc2", NULL, EECONFIG_SD2 },
 112         { "mmc3", NULL, EECONFIG_SD3 },
 113         { /* Sentinel */ }
 114 };
 115
 116 #ifdef CONFIG_CMD_EECONFIG
 117 static struct ventana_eeprom_config *get_config(const char *name)
 118 {
 119         struct ventana_eeprom_config *cfg = econfig;
 120
 121         while (cfg->name) {
 122                 if (0 == strcmp(name, cfg->name))
 123                         return cfg;
 124                 cfg++;
 125         }
 126         return NULL;
 127 }
 128
 129 static u8 econfig_bytes[sizeof(ventana_info.config)];
 130 static int econfig_init = -1;
 131
 132 int do_econfig(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 133 {
 134         struct ventana_eeprom_config *cfg;
 135         struct ventana_board_info *info = &ventana_info;
 136         int i;
 137
 138         if (argc < 2)
 139                 return CMD_RET_USAGE;
 140
 141         /* initialize */
 142         if (econfig_init != 1) {
 143                 memcpy(econfig_bytes, info->config, sizeof(econfig_bytes));
 144                 econfig_init = 1;
 145         }
 146
 147         /* list configs */
 148         if ((strncmp(argv[1], "list", 4) == 0)) {
 149                 cfg = econfig;
 150                 while (cfg->name) {
 151                         printf("%s: %d\n", cfg->name,
 152                                test_bit(cfg->bit, econfig_bytes) ?  1 : 0);
 153                         cfg++;
 154                 }
 155         }
 156
 157         /* save */
 158         else if ((strncmp(argv[1], "save", 4) == 0)) {
 159                 unsigned char *buf = (unsigned char *)info;
 160                 int chksum;
 161
 162                 /* calculate new checksum */
 163                 memcpy(info->config, econfig_bytes, sizeof(econfig_bytes));
 164                 for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
 165                         chksum += buf[i];
 166                 debug("old chksum:0x%04x\n",
 167                       (info->chksum[0] << 8) | info->chksum[1]);
 168                 debug("new chksum:0x%04x\n", chksum);
 169                 info->chksum[0] = chksum >> 8;
 170                 info->chksum[1] = chksum & 0xff;
 171
 172                 /* write new config data */
 173                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->config - (u8 *)info,
 174                                   1, econfig_bytes, sizeof(econfig_bytes))) {
 175                         printf("EEPROM: Failed updating config\n");
 176                         return CMD_RET_FAILURE;
 177                 }
 178
 179                 /* write new config data */
 180                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->chksum - (u8 *)info,
 181                                   1, info->chksum, 2)) {
 182                         printf("EEPROM: Failed updating checksum\n");
 183                         return CMD_RET_FAILURE;
 184                 }
 185
 186                 printf("Config saved to EEPROM\n");
 187         }
 188
 189         /* get config */
 190         else if (argc == 2) {
 191                 cfg = get_config(argv[1]);
 192                 if (cfg) {
 193                         printf("%s: %d\n", cfg->name,
 194                                test_bit(cfg->bit, econfig_bytes) ? 1 : 0);
 195                 } else {
 196                         printf("invalid config: %s\n", argv[1]);
 197                         return CMD_RET_FAILURE;
 198                 }
 199         }
 200
 201         /* set config */
 202         else if (argc == 3) {
 203                 cfg = get_config(argv[1]);
 204                 if (cfg) {
 205                         if (simple_strtol(argv[2], NULL, 10)) {
 206                                 test_and_set_bit(cfg->bit, econfig_bytes);
 207                                 printf("Enabled %s\n", cfg->name);
 208                         } else {
 209                                 test_and_clear_bit(cfg->bit, econfig_bytes);
 210                                 printf("Disabled %s\n", cfg->name);
 211                         }
 212                 } else {
 213                         printf("invalid config: %s\n", argv[1]);
 214                         return CMD_RET_FAILURE;
 215                 }
 216         }
 217
 218         else
 219                 return CMD_RET_USAGE;
 220
 221         return CMD_RET_SUCCESS;
 222 }
 223
 224 U_BOOT_CMD(
 225         econfig, 3, 0, do_econfig,
 226         "EEPROM configuration",
 227         "list - list config\n"
 228         "save - save config to EEPROM\n"
 229         "<name> - get config 'name'\n"
 230         "<name> [0|1] - set config 'name' to value\n"
 231 );
 232
 233 #endif /* CONFIG_CMD_EECONFIG */