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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Zodiac Inflight Innovation
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* based on previous iterations of this code
*
* Copyright (C) 2015 Nikita Yushchenko, CogentEmbedded, Inc
* Copyright (C) 2015 Andrey Gusakov, CogentEmbedded, Inc
*
* based on similar i.MX51 EVK (Babbage) board support code
*
* Copyright (C) 2007 Sascha Hauer, Pengutronix
*/
#include <common.h>
#include <init.h>
#include <environment.h>
#include <mach/bbu.h>
#include <libfile.h>
#include <mach/imx5.h>
#include <net.h>
#include <linux/crc8.h>
#include <linux/sizes.h>
#include <linux/nvmem-consumer.h>
#include <envfs.h>
static int zii_rdu1_init(void)
{
const char *hostname;
if (!of_machine_is_compatible("zii,imx51-rdu1") &&
!of_machine_is_compatible("zii,imx51-scu2-mezz") &&
!of_machine_is_compatible("zii,imx51-scu3-esb"))
return 0;
hostname = of_get_machine_compatible() + strlen("imx51-");
imx51_babbage_power_init();
barebox_set_hostname(hostname);
imx51_bbu_internal_mmcboot_register_handler("eMMC", "/dev/mmc0", 0);
imx51_bbu_internal_spi_i2c_register_handler("SPI",
"/dev/dataflash0.barebox",
BBU_HANDLER_FLAG_DEFAULT |
IMX_BBU_FLAG_PARTITION_STARTS_AT_HEADER);
return 0;
}
coredevice_initcall(zii_rdu1_init);
#define KEY 0
#define VALUE 1
#define STRINGS_NUM 2
static int zii_rdu1_load_config(void)
{
struct device_node *np, *root;
size_t len, remaining_space;
const uint8_t crc8_polynomial = 0x8c;
DECLARE_CRC8_TABLE(crc8_table);
const char *cursor, *end;
const char *file = "/dev/dataflash0.config";
uint8_t *config;
int ret = 0;
enum {
BLOB_SPINOR,
BLOB_RAVE_SP_EEPROM,
BLOB_MICROWIRE,
} blob;
if (!of_machine_is_compatible("zii,imx51-rdu1"))
return 0;
crc8_populate_lsb(crc8_table, crc8_polynomial);
for (blob = BLOB_SPINOR; blob <= BLOB_MICROWIRE; blob++) {
switch (blob) {
case BLOB_MICROWIRE:
file = "/dev/microwire-eeprom";
/* FALLTHROUGH */
case BLOB_SPINOR:
config = read_file(file, &remaining_space);
if (!config) {
pr_err("Failed to read %s\n", file);
return -EIO;
}
break;
case BLOB_RAVE_SP_EEPROM:
/* Needed for error logging below */
file = "shadow copy in RAVE SP EEPROM";
root = of_get_root_node();
np = of_find_node_by_name(root, "eeprom@a4");
if (!np)
return -ENODEV;
pr_info("Loading %s, this may take a while\n", file);
remaining_space = SZ_1K;
config = nvmem_cell_get_and_read(np, "shadow-config",
remaining_space);
if (IS_ERR(config))
return PTR_ERR(config);
break;
}
/*
* The environment blob has its CRC8 stored as the
* last byte of the blob, so calculating CRC8 over the
* whole things should return 0
*/
if (crc8(crc8_table, config, remaining_space, 0)) {
pr_err("CRC mismatch for %s\n", file);
free(config);
config = NULL;
} else {
/*
* We are done if there's a blob with a valid
* CRC8
*/
break;
}
}
if (!config) {
pr_err("No valid config blobs were found\n");
ret = -EINVAL;
goto free_config;
}
/*
* Last byte is CRC8, so it is of no use for our parsing
* algorithm
*/
remaining_space--;
cursor = config;
end = cursor + remaining_space;
/*
* The environemnt is stored a a bunch of zero-terminated
* ASCII strings in "key":"value" pairs
*/
while (cursor < end) {
const char *strings[STRINGS_NUM] = { NULL, NULL };
char *key;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(strings); i++) {
if (!*cursor) {
/* We assume that last key:value pair
* will be terminated by an extra '\0'
* at the end */
goto free_config;
}
len = strnlen(cursor, remaining_space);
if (len >= remaining_space) {
ret = -EOVERFLOW;
goto free_config;
}
strings[i] = cursor;
len++; /* Account for '\0' at the end of the string */
cursor += len;
remaining_space -= len;
if (cursor > end) {
ret = -EOVERFLOW;
goto free_config;
}
}
key = basprintf("config_%s", strings[KEY]);
ret = setenv(key, strings[VALUE]);
free(key);
if (ret)
goto free_config;
}
free_config:
free(config);
return ret;
}
late_initcall(zii_rdu1_load_config);
static int zii_rdu1_ethernet_init(void)
{
const char *mac_string;
struct device_node *np, *root;
uint8_t mac[ETH_ALEN];
int ret;
if (!of_machine_is_compatible("zii,imx51-rdu1"))
return 0;
root = of_get_root_node();
np = of_find_node_by_alias(root, "ethernet0");
if (!np) {
pr_warn("Failed to find ethernet0\n");
return -ENOENT;
}
mac_string = getenv("config_mac");
if (!mac_string)
return -ENOENT;
ret = string_to_ethaddr(mac_string, mac);
if (ret < 0)
return ret;
of_eth_register_ethaddr(np, mac);
return 0;
}
/* This needs to happen only after zii_rdu1_load_config was
* executed */
environment_initcall(zii_rdu1_ethernet_init);
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