--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 PHYTEC Messtechnik GmbH
+ * Author: Teresa Remmet <t.remmet@phytec.de>
+ */
+
+#include <common.h>
+#include <asm/mach-imx/mxc_i2c.h>
+#include <asm/arch/sys_proto.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+#include <i2c.h>
+#include <u-boot/crc.h>
+
+#include "phytec_som_detection.h"
+
+struct phytec_eeprom_data eeprom_data;
+
+int phytec_eeprom_data_setup_fallback(struct phytec_eeprom_data *data,
+ int bus_num, int addr, int addr_fallback)
+{
+ int ret;
+
+ ret = phytec_eeprom_data_init(data, bus_num, addr);
+ if (ret) {
+ pr_err("%s: init failed. Trying fall back address 0x%x\n",
+ __func__, addr_fallback);
+ ret = phytec_eeprom_data_init(data, bus_num, addr_fallback);
+ }
+
+ if (ret)
+ pr_err("%s: EEPROM data init failed\n", __func__);
+
+ return ret;
+}
+
+int phytec_eeprom_data_setup(struct phytec_eeprom_data *data,
+ int bus_num, int addr)
+{
+ int ret;
+
+ ret = phytec_eeprom_data_init(data, bus_num, addr);
+ if (ret)
+ pr_err("%s: EEPROM data init failed\n", __func__);
+
+ return ret;
+}
+
+int phytec_eeprom_data_init(struct phytec_eeprom_data *data,
+ int bus_num, int addr)
+{
+ int ret, i;
+ unsigned int crc;
+ int *ptr;
+
+ if (!data)
+ data = &eeprom_data;
+
+#if CONFIG_IS_ENABLED(DM_I2C)
+ struct udevice *dev;
+
+ ret = i2c_get_chip_for_busnum(bus_num, addr, 2, &dev);
+ if (ret) {
+ pr_err("%s: i2c EEPROM not found: %i.\n", __func__, ret);
+ return ret;
+ }
+
+ ret = dm_i2c_read(dev, 0, (uint8_t *)data,
+ sizeof(struct phytec_eeprom_data));
+ if (ret) {
+ pr_err("%s: Unable to read EEPROM data\n", __func__);
+ return ret;
+ }
+#else
+ i2c_set_bus_num(bus_num);
+ ret = i2c_read(addr, 0, 2, (uint8_t *)data,
+ sizeof(struct phytec_eeprom_data));
+#endif
+
+ if (data->api_rev == 0xff) {
+ pr_err("%s: EEPROM is not flashed. Prototype?\n", __func__);
+ return -EINVAL;
+ }
+
+ ptr = (int *)data;
+ for (i = 0; i < sizeof(struct phytec_eeprom_data); i += sizeof(ptr))
+ if (*ptr != 0x0)
+ break;
+
+ if (i == sizeof(struct phytec_eeprom_data)) {
+ pr_err("%s: EEPROM data is all zero. Erased?\n", __func__);
+ return -EINVAL;
+ }
+
+ /* We are done here for early revisions */
+ if (data->api_rev <= PHYTEC_API_REV1)
+ return 0;
+
+ crc = crc8(0, (const unsigned char *)data,
+ sizeof(struct phytec_eeprom_data));
+ debug("%s: crc: %x\n", __func__, crc);
+
+ if (crc) {
+ pr_err("%s: CRC mismatch. EEPROM data is not usable\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data)
+{
+ struct phytec_api2_data *api2;
+ char pcb_sub_rev;
+ unsigned int ksp_no, sub_som_type1, sub_som_type2;
+
+ if (!data)
+ data = &eeprom_data;
+
+ if (data->api_rev < PHYTEC_API_REV2)
+ return;
+
+ api2 = &data->data.data_api2;
+
+ /* Calculate PCB subrevision */
+ pcb_sub_rev = api2->pcb_sub_opt_rev & 0x0f;
+ pcb_sub_rev = pcb_sub_rev ? ((pcb_sub_rev - 1) + 'a') : ' ';
+
+ /* print standard product string */
+ if (api2->som_type <= 1) {
+ printf("SoM: %s-%03u-%s.%s PCB rev: %u%c\n",
+ phytec_som_type_str[api2->som_type], api2->som_no,
+ api2->opt, api2->bom_rev, api2->pcb_rev, pcb_sub_rev);
+ return;
+ }
+ /* print KSP/KSM string */
+ if (api2->som_type <= 3) {
+ ksp_no = (api2->ksp_no << 8) | api2->som_no;
+ printf("SoM: %s-%u ",
+ phytec_som_type_str[api2->som_type], ksp_no);
+ /* print standard product based KSP/KSM strings */
+ } else {
+ switch (api2->som_type) {
+ case 4:
+ sub_som_type1 = 0;
+ sub_som_type2 = 3;
+ break;
+ case 5:
+ sub_som_type1 = 0;
+ sub_som_type2 = 2;
+ break;
+ case 6:
+ sub_som_type1 = 1;
+ sub_som_type2 = 3;
+ break;
+ case 7:
+ sub_som_type1 = 1;
+ sub_som_type2 = 2;
+ break;
+ default:
+ break;
+ };
+
+ printf("SoM: %s-%03u-%s-%03u ",
+ phytec_som_type_str[sub_som_type1],
+ api2->som_no, phytec_som_type_str[sub_som_type2],
+ api2->ksp_no);
+ }
+
+ printf("Option: %s BOM rev: %s PCB rev: %u%c\n", api2->opt,
+ api2->bom_rev, api2->pcb_rev, pcb_sub_rev);
+}
+
+char * __maybe_unused phytec_get_opt(struct phytec_eeprom_data *data)
+{
+ char *opt;
+
+ if (!data)
+ data = &eeprom_data;
+
+ if (data->api_rev < PHYTEC_API_REV2)
+ opt = data->data.data_api0.opt;
+ else
+ opt = data->data.data_api2.opt;
+
+ return opt;
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2023 PHYTEC Messtechnik GmbH
+ * Author: Teresa Remmet <t.remmet@phytec.de>
+ */
+
+#ifndef _PHYTEC_SOM_DETECTION_H
+#define _PHYTEC_SOM_DETECTION_H
+
+#define PHYTEC_MAX_OPTIONS 17
+#define PHYTEC_EEPROM_INVAL 0xff
+
+#define PHYTEC_GET_OPTION(option) \
+ (((option) > '9') ? (option) - 'A' + 10 : (option) - '0')
+
+enum {
+ PHYTEC_API_REV0 = 0,
+ PHYTEC_API_REV1,
+ PHYTEC_API_REV2,
+};
+
+static const char * const phytec_som_type_str[] = {
+ "PCM",
+ "PCL",
+ "KSM",
+ "KSP",
+};
+
+struct phytec_api0_data {
+ u8 pcb_rev; /* PCB revision of SoM */
+ u8 som_type; /* SoM type */
+ u8 ksp_no; /* KSP no */
+ char opt[16]; /* SoM options */
+ u8 mac[6]; /* MAC address (optional) */
+ u8 pad[5]; /* padding */
+ u8 cksum; /* checksum */
+} __packed;
+
+struct phytec_api2_data {
+ u8 pcb_rev; /* PCB revision of SoM */
+ u8 pcb_sub_opt_rev; /* PCB subrevision and opt revision */
+ u8 som_type; /* SoM type */
+ u8 som_no; /* SoM number */
+ u8 ksp_no; /* KSP information */
+ char opt[PHYTEC_MAX_OPTIONS]; /* SoM options */
+ char bom_rev[2]; /* BOM revision */
+ u8 mac[6]; /* MAC address (optional) */
+ u8 crc8; /* checksum */
+} __packed;
+
+struct phytec_eeprom_data {
+ u8 api_rev;
+ union {
+ struct phytec_api0_data data_api0;
+ struct phytec_api2_data data_api2;
+ } data;
+} __packed;
+
+#if IS_ENABLED(CONFIG_PHYTEC_SOM_DETECTION)
+
+int phytec_eeprom_data_setup_fallback(struct phytec_eeprom_data *data,
+ int bus_num, int addr,
+ int addr_fallback);
+int phytec_eeprom_data_setup(struct phytec_eeprom_data *data,
+ int bus_num, int addr);
+int phytec_eeprom_data_init(struct phytec_eeprom_data *data,
+ int bus_num, int addr);
+void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data);
+
+char * __maybe_unused phytec_get_opt(struct phytec_eeprom_data *data);
+
+#else
+
+inline int phytec_eeprom_data_setup(struct phytec_eeprom_data *data,
+ int bus_num, int addr)
+{
+ return PHYTEC_EEPROM_INVAL;
+}
+
+inline int phytec_eeprom_data_setup_fallback(struct phytec_eeprom_data *data,
+ int bus_num, int addr,
+ int addr_fallback)
+{
+ return PHYTEC_EEPROM_INVAL;
+}
+
+inline int phytec_eeprom_data_init(struct phytec_eeprom_data *data,
+ int bus_num, int addr)
+{
+ return PHYTEC_EEPROM_INVAL;
+}
+
+inline void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data)
+{
+}
+
+inline char *__maybe_unused phytec_get_opt(struct phytec_eeprom_data *data)
+{
+ return NULL;
+}
+
+#endif /* IS_ENABLED(CONFIG_PHYTEC_SOM_DETECTION) */
+
+#endif /* _PHYTEC_SOM_DETECTION_H */
projects / u-boot.git / commitdiff