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         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 */