u-boot/board/gateworks/gw_ventana/eeprom.c
Tim Harvey 1badf2f47c imx: ventana: split read_eeprom into standalone file
Split the read_eeprom function out so that it can be shared (ie with SPL)

Cc: Stefan Roese <sr@denx.de>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Andy Ng <andreas2025@gmail.com>
Cc: Eric Nelson <eric.nelson@boundarydevices.com>
Cc: Tapani Utriainen <tapani@technexion.com>
Cc: Tom Rini <trini@ti.com>

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
2014-06-06 10:07:26 +02:00

89 lines
1.9 KiB
C

/*
* Copyright (C) 2014 Gateworks Corporation
* Author: Tim Harvey <tharvey@gateworks.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include "gsc.h"
#include "ventana_eeprom.h"
/* read ventana EEPROM, check for validity, and return baseboard type */
int
read_eeprom(int bus, struct ventana_board_info *info)
{
int i;
int chksum;
char baseboard;
int type;
unsigned char *buf = (unsigned char *)info;
memset(info, 0, sizeof(*info));
/*
* On a board with a missing/depleted backup battery for GSC, the
* board may be ready to probe the GSC before its firmware is
* running. We will wait here indefinately for the GSC/EEPROM.
*/
while (1) {
if (0 == i2c_set_bus_num(bus) &&
0 == i2c_probe(GSC_EEPROM_ADDR))
break;
mdelay(1);
}
/* read eeprom config section */
if (gsc_i2c_read(GSC_EEPROM_ADDR, 0x00, 1, buf, sizeof(*info))) {
puts("EEPROM: Failed to read EEPROM\n");
info->model[0] = 0;
return GW_UNKNOWN;
}
/* sanity checks */
if (info->model[0] != 'G' || info->model[1] != 'W') {
puts("EEPROM: Invalid Model in EEPROM\n");
info->model[0] = 0;
return GW_UNKNOWN;
}
/* validate checksum */
for (chksum = 0, i = 0; i < sizeof(*info)-2; i++)
chksum += buf[i];
if ((info->chksum[0] != chksum>>8) ||
(info->chksum[1] != (chksum&0xff))) {
puts("EEPROM: Failed EEPROM checksum\n");
info->model[0] = 0;
return GW_UNKNOWN;
}
/* original GW5400-A prototype */
baseboard = info->model[3];
if (strncasecmp((const char *)info->model, "GW5400-A", 8) == 0)
baseboard = '0';
switch (baseboard) {
case '0': /* original GW5400-A prototype */
type = GW54proto;
break;
case '1':
type = GW51xx;
break;
case '2':
type = GW52xx;
break;
case '3':
type = GW53xx;
break;
case '4':
type = GW54xx;
break;
default:
printf("EEPROM: Unknown model in EEPROM: %s\n", info->model);
type = GW_UNKNOWN;
break;
}
return type;
}