mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-09 12:46:17 +09:00
1badf2f47c
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>
90 lines
1.9 KiB
C
90 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;
|
|
}
|