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dc22188cdc
Recent shipped PHYTEC SoMs come with an i2c EEPROM containing information about the hardware such as board revision and variant. This can be used for RAM detection and loading device tree overlays during kernel start. Signed-off-by: Teresa Remmet <t.remmet@phytec.de> Reviewed-by: Yannic Moog <y.moog@phytec.de> Tested-by: Yannic Moog <y.moog@phytec.de> Reviewed-by: Fabio Estevam <festevam@gmail.com>
104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2023 PHYTEC Messtechnik GmbH
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* Author: Teresa Remmet <t.remmet@phytec.de>
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*/
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#ifndef _PHYTEC_SOM_DETECTION_H
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#define _PHYTEC_SOM_DETECTION_H
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#define PHYTEC_MAX_OPTIONS 17
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#define PHYTEC_EEPROM_INVAL 0xff
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#define PHYTEC_GET_OPTION(option) \
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(((option) > '9') ? (option) - 'A' + 10 : (option) - '0')
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enum {
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PHYTEC_API_REV0 = 0,
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PHYTEC_API_REV1,
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PHYTEC_API_REV2,
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};
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static const char * const phytec_som_type_str[] = {
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"PCM",
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"PCL",
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"KSM",
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"KSP",
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};
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struct phytec_api0_data {
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u8 pcb_rev; /* PCB revision of SoM */
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u8 som_type; /* SoM type */
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u8 ksp_no; /* KSP no */
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char opt[16]; /* SoM options */
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u8 mac[6]; /* MAC address (optional) */
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u8 pad[5]; /* padding */
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u8 cksum; /* checksum */
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} __packed;
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struct phytec_api2_data {
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u8 pcb_rev; /* PCB revision of SoM */
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u8 pcb_sub_opt_rev; /* PCB subrevision and opt revision */
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u8 som_type; /* SoM type */
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u8 som_no; /* SoM number */
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u8 ksp_no; /* KSP information */
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char opt[PHYTEC_MAX_OPTIONS]; /* SoM options */
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char bom_rev[2]; /* BOM revision */
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u8 mac[6]; /* MAC address (optional) */
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u8 crc8; /* checksum */
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} __packed;
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struct phytec_eeprom_data {
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u8 api_rev;
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union {
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struct phytec_api0_data data_api0;
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struct phytec_api2_data data_api2;
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} data;
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} __packed;
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#if IS_ENABLED(CONFIG_PHYTEC_SOM_DETECTION)
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int phytec_eeprom_data_setup_fallback(struct phytec_eeprom_data *data,
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int bus_num, int addr,
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int addr_fallback);
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int phytec_eeprom_data_setup(struct phytec_eeprom_data *data,
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int bus_num, int addr);
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int phytec_eeprom_data_init(struct phytec_eeprom_data *data,
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int bus_num, int addr);
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void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data);
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char * __maybe_unused phytec_get_opt(struct phytec_eeprom_data *data);
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#else
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inline int phytec_eeprom_data_setup(struct phytec_eeprom_data *data,
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int bus_num, int addr)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline int phytec_eeprom_data_setup_fallback(struct phytec_eeprom_data *data,
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int bus_num, int addr,
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int addr_fallback)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline int phytec_eeprom_data_init(struct phytec_eeprom_data *data,
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int bus_num, int addr)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data)
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{
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}
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inline char *__maybe_unused phytec_get_opt(struct phytec_eeprom_data *data)
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{
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return NULL;
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}
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#endif /* IS_ENABLED(CONFIG_PHYTEC_SOM_DETECTION) */
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#endif /* _PHYTEC_SOM_DETECTION_H */
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