sysinfo: tq_eeprom: new driver
Introduce a sysinfo driver that can be instantiated from the device, which will provide information from the EEPROM found on all TQ-Systems SoMs. Signed-off-by: Nora Schiffer <nora.schiffer@ew.tq-group.com> Signed-off-by: Max Merchel <Max.Merchel@ew.tq-group.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Alexander Feilke <alexander.feilke@ew.tq-group.com>
This commit is contained in:
Nora Schiffer
committed by
Fabio Estevam
Fabio Estevam
parent
0ef21dd37d
commit
a30556bc42
@@ -1865,6 +1865,7 @@ S: Maintained
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W: https://www.tq-group.com/en/products/tq-embedded/
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F: board/tq/*
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F: doc/board/tq/*
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F: drivers/sysinfo/tq_eeprom.c
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F: include/configs/tq*.h
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F: include/env/tq/*
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@@ -77,6 +77,7 @@ CONFIG_I2C_DEFAULT_BUS_NUMBER=0x3
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CONFIG_SYS_I2C_MXC=y
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CONFIG_LED=y
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CONFIG_LED_GPIO=y
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CONFIG_NVMEM=y
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CONFIG_SUPPORT_EMMC_BOOT=y
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CONFIG_FSL_USDHC=y
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CONFIG_MTD=y
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@@ -0,0 +1,36 @@
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TQ EEPROM Sysinfo Driver
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------------------------
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This binding describes a sysinfo provider which retrieves system
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identification information from an I2C EEPROM device.
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Required properties:
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- compatible: "tq,eeprom-sysinfo"
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- nvmem-cells: phandle referencing the nvmem cell
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- nvmem-cell-names: string, should be "device_info"
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Example:
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&i2c1 {
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eeprom@50 {
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compatible = "atmel,24c64";
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reg = <0x50>;
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nvmem-layout {
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compatible = "fixed-layout";
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#address-cells = <1>;
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#size-cells = <1>;
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module_info: module-info@20 {
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reg = <0x20 0x60>;
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};
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};
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};
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};
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sysinfo {
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compatible = "tq,eeprom-sysinfo";
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nvmem-cells = <&module_info>;
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nvmem-cell-names = "device_info";
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};
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@@ -59,4 +59,12 @@ config SYSINFO_GPIO
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This ternary number is then mapped to a board revision name using
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device tree properties.
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config SYSINFO_TQ_EEPROM
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bool "Enable TQ-Systems EEPROM sysinfo driver"
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depends on I2C_EEPROM
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depends on SPL_I2C_EEPROM || !SPL_SYSINFO
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help
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Support querying EEPROM of TQ-Systems SOMs to determine board
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information.
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endif
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@@ -9,3 +9,4 @@ obj-$(CONFIG_SYSINFO_IOT2050) += iot2050.o
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obj-$(CONFIG_SYSINFO_RCAR3) += rcar3.o
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obj-$(CONFIG_SYSINFO_SANDBOX) += sandbox.o
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obj-$(CONFIG_SYSINFO_SMBIOS) += smbios.o
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obj-$(CONFIG_SYSINFO_TQ_EEPROM) += tq_eeprom.o
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@@ -0,0 +1,203 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2014-2026 TQ-Systems GmbH <u-boot@ew.tq-group.com>,
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* D-82229 Seefeld, Germany.
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* Author: Nora Schiffer
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*/
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#include <dm.h>
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#include <log.h>
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#include <net.h>
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#include <dm/device_compat.h>
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#include <linux/build_bug.h>
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#include <linux/ctype.h>
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#include <nvmem.h>
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#include <sysinfo/tq_eeprom.h>
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#define TQ_EE_RSV1_BYTES 10
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#define TQ_EE_SERIAL_BYTES 8
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#define TQ_EE_RSV2_BYTES 8
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#define TQ_EE_BDID_BYTES 0x40
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struct tq_eeprom_data {
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u8 mac[ETH_ALEN]; /* 0x20 ... 0x25 */
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u8 rsv1[TQ_EE_RSV1_BYTES];
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u8 serial[TQ_EE_SERIAL_BYTES]; /* 0x30 ... 0x37 */
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u8 rsv2[TQ_EE_RSV2_BYTES];
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u8 id[TQ_EE_BDID_BYTES]; /* 0x40 ... 0x7f */
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};
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static_assert(sizeof(struct tq_eeprom_data) == 0x60,
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"struct tq_eeprom_data has incorrect size");
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/**
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* struct sysinfo_tq_eeprom_priv - sysinfo private data
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*/
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struct sysinfo_tq_eeprom_priv {
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struct nvmem_cell device_info_cell;
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/* Reserve extra space for \0 in id and serial */
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char id[TQ_EE_BDID_BYTES + 1];
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char serial[TQ_EE_SERIAL_BYTES + 1];
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u8 mac[ETH_ALEN];
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};
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static void tq_eeprom_parse_id(struct udevice *dev, const struct tq_eeprom_data *data)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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int i;
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for (i = 0; i < sizeof(data->id); i++) {
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if (!(isprint(data->id[i]) && isascii(data->id[i])))
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break;
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}
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if (i == 0)
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dev_warn(dev, "no valid model name in EEPROM\n");
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snprintf(priv->id, sizeof(priv->id), "%.*s", i, data->id);
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}
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static int tq_eeprom_serial_len(const struct tq_eeprom_data *data, bool allow_upper)
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{
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int i;
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for (i = 0; i < sizeof(data->serial); i++) {
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if (!(isdigit(data->serial[i]) || (allow_upper && isupper(data->serial[i]))))
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break;
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}
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return i;
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}
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static void tq_eeprom_parse_serial(struct udevice *dev, const struct tq_eeprom_data *data)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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bool use_new_format;
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int len;
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use_new_format = data->serial[0] == 'T' && data->serial[1] == 'Q';
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len = tq_eeprom_serial_len(data, use_new_format);
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/* For now, only serial numbers with the exact size of the field are accepted */
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if (len != sizeof(data->serial)) {
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dev_warn(dev, "no valid serial number in EEPROM\n");
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len = 0;
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}
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snprintf(priv->serial, sizeof(priv->serial), "%.*s", len, data->serial);
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}
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static int tq_eeprom_dump(const struct sysinfo_tq_eeprom_priv *priv)
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{
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printf("TQ EEPROM:\n");
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printf(" ID: %s\n", priv->id[0] ? priv->id : "<invalid>");
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printf(" SN: %s\n", priv->serial[0] ? priv->serial : "<invalid>");
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printf(" MAC: ");
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if (is_valid_ethaddr(priv->mac))
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printf("%pM\n", priv->mac);
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else
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printf("<invalid>\n");
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return 0;
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}
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static int sysinfo_tq_eeprom_detect(struct udevice *dev)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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struct tq_eeprom_data data;
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int ret;
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ret = nvmem_cell_read(&priv->device_info_cell, (u8 *)&data, sizeof(data));
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if (ret < 0) {
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dev_err(dev, "EEPROM read failed: %d\n", ret);
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return ret;
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}
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tq_eeprom_parse_id(dev, &data);
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tq_eeprom_parse_serial(dev, &data);
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memcpy(priv->mac, data.mac, ETH_ALEN);
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if (!IS_ENABLED(CONFIG_SPL_BUILD))
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tq_eeprom_dump(priv);
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return 0;
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}
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static int sysinfo_tq_eeprom_get_str(struct udevice *dev, int id, size_t size, char *val)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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switch (id) {
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case SYSID_TQ_MODEL:
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if (!priv->id[0])
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return -ENODATA;
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strlcpy(val, priv->id, size);
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return 0;
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case SYSID_TQ_SERIAL:
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if (!priv->serial[0])
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return -ENODATA;
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strlcpy(val, priv->serial, size);
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int sysinfo_tq_eeprom_get_data(struct udevice *dev, int id, void **data, size_t *size)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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switch (id) {
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case SYSID_TQ_MAC_ADDR:
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if (!is_valid_ethaddr(priv->mac))
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return -ENODATA;
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*data = priv->mac;
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*size = sizeof(priv->mac);
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct sysinfo_ops sysinfo_tq_eeprom_ops = {
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.detect = sysinfo_tq_eeprom_detect,
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.get_str = sysinfo_tq_eeprom_get_str,
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.get_data = sysinfo_tq_eeprom_get_data,
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};
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static int sysinfo_tq_eeprom_probe(struct udevice *dev)
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{
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struct sysinfo_tq_eeprom_priv *priv = dev_get_priv(dev);
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int ret;
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ret = nvmem_cell_get_by_name(dev, "device_info", &priv->device_info_cell);
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if (ret) {
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dev_err(dev, "device_info not found: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct udevice_id sysinfo_tq_eeprom_ids[] = {
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{ .compatible = "tq,eeprom-sysinfo" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(sysinfo_tq_eeprom) = {
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.name = "sysinfo_tq_eeprom",
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.id = UCLASS_SYSINFO,
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.of_match = sysinfo_tq_eeprom_ids,
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.ops = &sysinfo_tq_eeprom_ops,
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.priv_auto = sizeof(struct sysinfo_tq_eeprom_priv),
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.probe = sysinfo_tq_eeprom_probe,
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};
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@@ -0,0 +1,24 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2023-2026 TQ-Systems GmbH <u-boot@ew.tq-group.com>,
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* D-82229 Seefeld, Germany.
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* Author: Nora Schiffer
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*/
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#ifndef __SYSINFO_TQ_EEPROM_H__
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#define __SYSINFO_TQ_EEPROM_H__
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#include <sysinfo.h>
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enum {
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/* Model string of TQ-Systems SOM. This is different from BOARD_MODEL,
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* which usually combines SOM and baseboard names for TQ hardware
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*/
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SYSID_TQ_MODEL = SYSID_USER,
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/* SOM serial number */
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SYSID_TQ_SERIAL,
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/* MAC address */
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SYSID_TQ_MAC_ADDR,
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};
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#endif /* __SYSINFO_TQ_EEPROM_H__ */
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