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         default:
  84                 printf("EEPROM: Unknown model in EEPROM: %s\n", info->model);
  85                 type = GW_UNKNOWN;
  86                 break;
  87         }
  88         return type;
  89 }
  90
  91 /* list of config bits that the bootloader will remove from dtb if not set */
  92 struct ventana_eeprom_config econfig[] = {
  93         { "eth0", "ethernet0", EECONFIG_ETH0 },
  94         { "eth1", "ethernet1", EECONFIG_ETH1 },
  95         { "sata", "ahci0", EECONFIG_SATA },
  96         { "pcie", NULL, EECONFIG_PCIE},
  97         { "lvds0", NULL, EECONFIG_LVDS0 },
  98         { "lvds1", NULL, EECONFIG_LVDS1 },
  99         { "usb0", NULL, EECONFIG_USB0 },
 100         { "usb1", NULL, EECONFIG_USB1 },
 101         { "mmc0", NULL, EECONFIG_SD0 },
 102         { "mmc1", NULL, EECONFIG_SD1 },
 103         { "mmc2", NULL, EECONFIG_SD2 },
 104         { "mmc3", NULL, EECONFIG_SD3 },
 105         { "uart0", NULL, EECONFIG_UART0 },
 106         { "uart1", NULL, EECONFIG_UART1 },
 107         { "uart2", NULL, EECONFIG_UART2 },
 108         { "uart3", NULL, EECONFIG_UART3 },
 109         { "uart4", NULL, EECONFIG_UART4 },
 110         { "ipu0", NULL, EECONFIG_IPU0 },
 111         { "ipu1", NULL, EECONFIG_IPU1 },
 112         { "can0", NULL, EECONFIG_FLEXCAN },
 113         { "i2c0", NULL, EECONFIG_I2C0 },
 114         { "i2c1", NULL, EECONFIG_I2C1 },
 115         { "i2c2", NULL, EECONFIG_I2C2 },
 116         { "vpu", NULL, EECONFIG_VPU },
 117         { "csi0", NULL, EECONFIG_CSI0 },
 118         { "csi1", NULL, EECONFIG_CSI1 },
 119         { "spi0", NULL, EECONFIG_ESPCI0 },
 120         { "spi1", NULL, EECONFIG_ESPCI1 },
 121         { "spi2", NULL, EECONFIG_ESPCI2 },
 122         { "spi3", NULL, EECONFIG_ESPCI3 },
 123         { "spi4", NULL, EECONFIG_ESPCI4 },
 124         { "spi5", NULL, EECONFIG_ESPCI5 },
 125         { "gps", "pps", EECONFIG_GPS },
 126         { "hdmi_in", NULL, EECONFIG_HDMI_IN },
 127         { "hdmi_out", NULL, EECONFIG_HDMI_OUT },
 128         { "cvbs_in", NULL, EECONFIG_VID_IN },
 129         { "cvbs_out", NULL, EECONFIG_VID_OUT },
 130         { "nand", NULL, EECONFIG_NAND },
 131         { /* Sentinel */ }
 132 };
 133
 134 #ifdef CONFIG_CMD_EECONFIG
 135 static struct ventana_eeprom_config *get_config(const char *name)
 136 {
 137         struct ventana_eeprom_config *cfg = econfig;
 138
 139         while (cfg->name) {
 140                 if (0 == strcmp(name, cfg->name))
 141                         return cfg;
 142                 cfg++;
 143         }
 144         return NULL;
 145 }
 146
 147 static u8 econfig_bytes[sizeof(ventana_info.config)];
 148 static int econfig_init = -1;
 149
 150 int do_econfig(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 151 {
 152         struct ventana_eeprom_config *cfg;
 153         struct ventana_board_info *info = &ventana_info;
 154         int i;
 155
 156         if (argc < 2)
 157                 return CMD_RET_USAGE;
 158
 159         /* initialize */
 160         if (econfig_init != 1) {
 161                 memcpy(econfig_bytes, info->config, sizeof(econfig_bytes));
 162                 econfig_init = 1;
 163         }
 164
 165         /* list configs */
 166         if ((strncmp(argv[1], "list", 4) == 0)) {
 167                 cfg = econfig;
 168                 while (cfg->name) {
 169                         printf("%s: %d\n", cfg->name,
 170                                test_bit(cfg->bit, econfig_bytes) ?  1 : 0);
 171                         cfg++;
 172                 }
 173         }
 174
 175         /* save */
 176         else if ((strncmp(argv[1], "save", 4) == 0)) {
 177                 unsigned char *buf = (unsigned char *)info;
 178                 int chksum;
 179
 180                 /* calculate new checksum */
 181                 memcpy(info->config, econfig_bytes, sizeof(econfig_bytes));
 182                 for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
 183                         chksum += buf[i];
 184                 debug("old chksum:0x%04x\n",
 185                       (info->chksum[0] << 8) | info->chksum[1]);
 186                 debug("new chksum:0x%04x\n", chksum);
 187                 info->chksum[0] = chksum >> 8;
 188                 info->chksum[1] = chksum & 0xff;
 189
 190                 /* write new config data */
 191                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->config - (u8 *)info,
 192                                   1, econfig_bytes, sizeof(econfig_bytes))) {
 193                         printf("EEPROM: Failed updating config\n");
 194                         return CMD_RET_FAILURE;
 195                 }
 196
 197                 /* write new config data */
 198                 if (gsc_i2c_write(GSC_EEPROM_ADDR, info->chksum - (u8 *)info,
 199                                   1, info->chksum, 2)) {
 200                         printf("EEPROM: Failed updating checksum\n");
 201                         return CMD_RET_FAILURE;
 202                 }
 203
 204                 printf("Config saved to EEPROM\n");
 205         }
 206
 207         /* get config */
 208         else if (argc == 2) {
 209                 cfg = get_config(argv[1]);
 210                 if (cfg) {
 211                         printf("%s: %d\n", cfg->name,
 212                                test_bit(cfg->bit, econfig_bytes) ? 1 : 0);
 213                 } else {
 214                         printf("invalid config: %s\n", argv[1]);
 215                         return CMD_RET_FAILURE;
 216                 }
 217         }
 218
 219         /* set config */
 220         else if (argc == 3) {
 221                 cfg = get_config(argv[1]);
 222                 if (cfg) {
 223                         if (simple_strtol(argv[2], NULL, 10)) {
 224                                 test_and_set_bit(cfg->bit, econfig_bytes);
 225                                 printf("Enabled %s\n", cfg->name);
 226                         } else {
 227                                 test_and_clear_bit(cfg->bit, econfig_bytes);
 228                                 printf("Disabled %s\n", cfg->name);
 229                         }
 230                 } else {
 231                         printf("invalid config: %s\n", argv[1]);
 232                         return CMD_RET_FAILURE;
 233                 }
 234         }
 235
 236         else
 237                 return CMD_RET_USAGE;
 238
 239         return CMD_RET_SUCCESS;
 240 }
 241
 242 U_BOOT_CMD(
 243         econfig, 3, 0, do_econfig,
 244         "EEPROM configuration",
 245         "list - list config\n"
 246         "save - save config to EEPROM\n"
 247         "<name> - get config 'name'\n"
 248         "<name> [0|1] - set config 'name' to value\n"
 249 );
 250
 251 #endif /* CONFIG_CMD_EECONFIG */