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