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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2014-2026 TQ-Systems GmbH <[email protected]>,
* D-82229 Seefeld, Germany.
* Author: Nora Schiffer
*/
#include <dm.h>
#include <log.h>
#include <net.h>
#include <dm/device_compat.h>
#include <linux/build_bug.h>
#include <linux/ctype.h>
#include <nvmem.h>
#include <sysinfo/tq_eeprom.h>
#define TQ_EE_RSV1_BYTES 10
#define TQ_EE_SERIAL_BYTES 8
#define TQ_EE_RSV2_BYTES 8
#define TQ_EE_BDID_BYTES 0x40
struct tq_eeprom_data {
u8 mac[ETH_ALEN]; /* 0x20 ... 0x25 */
u8 rsv1[TQ_EE_RSV1_BYTES];
u8 serial[TQ_EE_SERIAL_BYTES]; /* 0x30 ... 0x37 */
u8 rsv2[TQ_EE_RSV2_BYTES];
u8 id[TQ_EE_BDID_BYTES]; /* 0x40 ... 0x7f */
};
static_assert(sizeof(struct tq_eeprom_data) == 0x60,
"struct tq_eeprom_data has incorrect size");
/**
* struct sysinfo_tq_eeprom_priv - sysinfo private data
*/
struct sysinfo_tq_eeprom_priv {
struct nvmem_cell device_info_cell;
/* Reserve extra space for \0 in id and serial */
char id[TQ_EE_BDID_BYTES + 1];
char serial[TQ_EE_SERIAL_BYTES + 1];
u8 mac[ETH_ALEN];
};
static void tq_eeprom_parse_id(struct udevice *dev, const struct tq_eeprom_data *data)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
int i;
for (i = 0; i < sizeof(data->id); i++) {
if (!(isprint(data->id[i]) && isascii(data->id[i])))
break;
}
if (i == 0)
dev_warn(dev, "no valid model name in EEPROM\n");
snprintf(priv->id, sizeof(priv->id), "%.*s", i, data->id);
}
static int tq_eeprom_serial_len(const struct tq_eeprom_data *data, bool allow_upper)
{
int i;
for (i = 0; i < sizeof(data->serial); i++) {
if (!(isdigit(data->serial[i]) || (allow_upper && isupper(data->serial[i]))))
break;
}
return i;
}
static void tq_eeprom_parse_serial(struct udevice *dev, const struct tq_eeprom_data *data)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
bool use_new_format;
int len;
use_new_format = data->serial[0] == 'T' && data->serial[1] == 'Q';
len = tq_eeprom_serial_len(data, use_new_format);
/* For now, only serial numbers with the exact size of the field are accepted */
if (len != sizeof(data->serial)) {
dev_warn(dev, "no valid serial number in EEPROM\n");
len = 0;
}
snprintf(priv->serial, sizeof(priv->serial), "%.*s", len, data->serial);
}
static int tq_eeprom_dump(const struct sysinfo_tq_eeprom_priv *priv)
{
printf("TQ EEPROM:\n");
printf(" ID: %s\n", priv->id[0] ? priv->id : "<invalid>");
printf(" SN: %s\n", priv->serial[0] ? priv->serial : "<invalid>");
printf(" MAC: ");
if (is_valid_ethaddr(priv->mac))
printf("%pM\n", priv->mac);
else
printf("<invalid>\n");
return 0;
}
static int sysinfo_tq_eeprom_detect(struct udevice *dev)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
struct tq_eeprom_data data;
int ret;
ret = nvmem_cell_read(&priv->device_info_cell, (u8 *)&data, sizeof(data));
if (ret < 0) {
dev_err(dev, "EEPROM read failed: %d\n", ret);
return ret;
}
tq_eeprom_parse_id(dev, &data);
tq_eeprom_parse_serial(dev, &data);
memcpy(priv->mac, data.mac, ETH_ALEN);
if (!IS_ENABLED(CONFIG_SPL_BUILD))
tq_eeprom_dump(priv);
return 0;
}
static int sysinfo_tq_eeprom_get_str(struct udevice *dev, int id, size_t size, char *val)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
switch (id) {
case SYSID_TQ_MODEL:
if (!priv->id[0])
return -ENODATA;
strlcpy(val, priv->id, size);
return 0;
case SYSID_TQ_SERIAL:
if (!priv->serial[0])
return -ENODATA;
strlcpy(val, priv->serial, size);
return 0;
default:
return -EINVAL;
}
}
static int sysinfo_tq_eeprom_get_data(struct udevice *dev, int id, void **data, size_t *size)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
switch (id) {
case SYSID_TQ_MAC_ADDR:
if (!is_valid_ethaddr(priv->mac))
return -ENODATA;
*data = priv->mac;
*size = sizeof(priv->mac);
return 0;
default:
return -EINVAL;
}
}
static const struct sysinfo_ops sysinfo_tq_eeprom_ops = {
.detect = sysinfo_tq_eeprom_detect,
.get_str = sysinfo_tq_eeprom_get_str,
.get_data = sysinfo_tq_eeprom_get_data,
};
static int sysinfo_tq_eeprom_probe(struct udevice *dev)
{
struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
int ret;
ret = nvmem_cell_get_by_name(dev, "device_info", &priv->device_info_cell);
if (ret) {
dev_err(dev, "device_info not found: %d\n", ret);
return ret;
}
return 0;
}
static const struct udevice_id sysinfo_tq_eeprom_ids[] = {
{ .compatible = "tq,eeprom-sysinfo" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(sysinfo_tq_eeprom) = {
.name = "sysinfo_tq_eeprom",
.id = UCLASS_SYSINFO,
.of_match = sysinfo_tq_eeprom_ids,
.ops = &sysinfo_tq_eeprom_ops,
.priv_auto = sizeof(struct sysinfo_tq_eeprom_priv),
.probe = sysinfo_tq_eeprom_probe,
};
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