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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2013
* Corscience GmbH & Co. KG, <www.corscience.de>
* Andreas Bießmann <andreas.biessmann@corscience.de>
*/
#include <common.h>
#include <eeprom.h>
#include <i2c.h>
#include <u-boot/crc.h>
#include "tricorder-eeprom.h"
static inline void warn_wrong_value(const char *msg, unsigned int a,
unsigned int b)
{
printf("Expected EEPROM %s %08x, got %08x\n", msg, a, b);
}
static int handle_eeprom_v0(struct tricorder_eeprom *eeprom)
{
struct tricorder_eeprom_v0 {
uint32_t magic;
uint16_t length;
uint16_t version;
char board_name[TRICORDER_BOARD_NAME_LENGTH];
char board_version[TRICORDER_BOARD_VERSION_LENGTH];
char board_serial[TRICORDER_BOARD_SERIAL_LENGTH];
uint32_t crc32;
} __packed eepromv0;
uint32_t crc;
printf("Old EEPROM (v0), consider rewrite!\n");
if (be16_to_cpu(eeprom->length) != sizeof(eepromv0)) {
warn_wrong_value("length", sizeof(eepromv0),
be16_to_cpu(eeprom->length));
return 1;
}
memcpy(&eepromv0, eeprom, sizeof(eepromv0));
crc = crc32(0L, (unsigned char *)&eepromv0,
sizeof(eepromv0) - sizeof(eepromv0.crc32));
if (be32_to_cpu(eepromv0.crc32) != crc) {
warn_wrong_value("CRC", be32_to_cpu(eepromv0.crc32),
crc);
return 1;
}
/* Ok the content is correct, do the conversion */
memset(eeprom->interface_version, 0x0,
TRICORDER_INTERFACE_VERSION_LENGTH);
crc = crc32(0L, (unsigned char *)eeprom, TRICORDER_EEPROM_CRC_SIZE);
eeprom->crc32 = cpu_to_be32(crc);
return 0;
}
static int handle_eeprom_v1(struct tricorder_eeprom *eeprom)
{
uint32_t crc;
if (be16_to_cpu(eeprom->length) != TRICORDER_EEPROM_SIZE) {
warn_wrong_value("length", TRICORDER_EEPROM_SIZE,
be16_to_cpu(eeprom->length));
return 1;
}
crc = crc32(0L, (unsigned char *)eeprom, TRICORDER_EEPROM_CRC_SIZE);
if (be32_to_cpu(eeprom->crc32) != crc) {
warn_wrong_value("CRC", be32_to_cpu(eeprom->crc32), crc);
return 1;
}
return 0;
}
int tricorder_get_eeprom(int addr, struct tricorder_eeprom *eeprom)
{
unsigned int bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
memset(eeprom, 0, TRICORDER_EEPROM_SIZE);
i2c_read(addr, 0, 2, (unsigned char *)eeprom, TRICORDER_EEPROM_SIZE);
i2c_set_bus_num(bus);
if (be32_to_cpu(eeprom->magic) != TRICORDER_EEPROM_MAGIC) {
warn_wrong_value("magic", TRICORDER_EEPROM_MAGIC,
be32_to_cpu(eeprom->magic));
return 1;
}
switch (be16_to_cpu(eeprom->version)) {
case 0:
return handle_eeprom_v0(eeprom);
case 1:
return handle_eeprom_v1(eeprom);
default:
warn_wrong_value("version", TRICORDER_EEPROM_VERSION,
be16_to_cpu(eeprom->version));
return 1;
}
}
#if !defined(CONFIG_SPL)
int tricorder_eeprom_read(unsigned devaddr)
{
struct tricorder_eeprom eeprom;
int ret = tricorder_get_eeprom(devaddr, &eeprom);
if (ret)
return ret;
printf("Board type: %.*s\n",
sizeof(eeprom.board_name), eeprom.board_name);
printf("Board version: %.*s\n",
sizeof(eeprom.board_version), eeprom.board_version);
printf("Board serial: %.*s\n",
sizeof(eeprom.board_serial), eeprom.board_serial);
printf("Board interface version: %.*s\n",
sizeof(eeprom.interface_version),
eeprom.interface_version);
return ret;
}
int tricorder_eeprom_write(unsigned devaddr, const char *name,
const char *version, const char *serial, const char *interface)
{
struct tricorder_eeprom eeprom, eeprom_verify;
size_t length;
uint32_t crc;
int ret;
unsigned char *p;
int i;
memset(eeprom, 0, TRICORDER_EEPROM_SIZE);
memset(eeprom_verify, 0, TRICORDER_EEPROM_SIZE);
eeprom.magic = cpu_to_be32(TRICORDER_EEPROM_MAGIC);
eeprom.length = cpu_to_be16(TRICORDER_EEPROM_SIZE);
eeprom.version = cpu_to_be16(TRICORDER_EEPROM_VERSION);
length = min(sizeof(eeprom.board_name), strlen(name));
strncpy(eeprom.board_name, name, length);
length = min(sizeof(eeprom.board_version), strlen(version));
strncpy(eeprom.board_version, version, length);
length = min(sizeof(eeprom.board_serial), strlen(serial));
strncpy(eeprom.board_serial, serial, length);
if (interface) {
length = min(sizeof(eeprom.interface_version),
strlen(interface));
strncpy(eeprom.interface_version, interface, length);
}
crc = crc32(0L, (unsigned char *)&eeprom, TRICORDER_EEPROM_CRC_SIZE);
eeprom.crc32 = cpu_to_be32(crc);
#if defined(DEBUG)
puts("Tricorder EEPROM content:\n");
print_buffer(0, &eeprom, 1, sizeof(eeprom), 16);
#endif
eeprom_init(CONFIG_SYS_EEPROM_BUS_NUM);
ret = eeprom_write(devaddr, 0, (unsigned char *)&eeprom,
TRICORDER_EEPROM_SIZE);
if (ret)
printf("Tricorder: Could not write EEPROM content!\n");
ret = eeprom_read(devaddr, 0, (unsigned char *)&eeprom_verify,
TRICORDER_EEPROM_SIZE);
if (ret)
printf("Tricorder: Could not read EEPROM content!\n");
if (memcmp(&eeprom, &eeprom_verify, sizeof(eeprom)) != 0) {
printf("Tricorder: Could not verify EEPROM content!\n");
ret = 1;
}
return ret;
}
int do_tricorder_eeprom(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
if (argc == 3) {
ulong dev_addr = simple_strtoul(argv[2], NULL, 16);
if (strcmp(argv[1], "read") == 0)
return tricorder_eeprom_read(dev_addr);
} else if (argc == 6 || argc == 7) {
ulong dev_addr = simple_strtoul(argv[2], NULL, 16);
char *name = argv[3];
char *version = argv[4];
char *serial = argv[5];
char *interface = NULL;
if (argc == 7)
interface = argv[6];
if (strcmp(argv[1], "write") == 0)
return tricorder_eeprom_write(dev_addr, name, version,
serial, interface);
}
return CMD_RET_USAGE;
}
U_BOOT_CMD(
tricordereeprom, 7, 1, do_tricorder_eeprom,
"Tricorder EEPROM",
"read devaddr\n"
" - read Tricorder EEPROM at devaddr and print content\n"
"tricordereeprom write devaddr name version serial [interface]\n"
" - write Tricorder EEPROM at devaddr with 'name', 'version'"
"and 'serial'\n"
" optional add an HW interface parameter"
);
#endif /* CONFIG_SPL */
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