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9d152c2327
Add all functions to read each SOM option from the EEPROM image and detect whether it's the correct product for this image. Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
159 lines
3.3 KiB
C
159 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2024 PHYTEC Messtechnik GmbH
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* Author: Daniel Schultz <d.schultz@phytec.de>
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*/
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#include <asm/arch/hardware.h>
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#include "am6_som_detection.h"
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extern struct phytec_eeprom_data eeprom_data;
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#if IS_ENABLED(CONFIG_PHYTEC_AM62_SOM_DETECTION) || \
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IS_ENABLED(CONFIG_PHYTEC_AM64_SOM_DETECTION)
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/* Check if the SoM is actually one of the following products:
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* - phyCORE-AM62x
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* - phyCORE-AM64x
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*
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* Returns 0 in case it's a known SoM. Otherwise, returns -1.
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*/
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int phytec_am6_detect(struct phytec_eeprom_data *data)
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{
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char *opt;
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u8 som;
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if (!data)
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data = &eeprom_data;
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/* We cannot do the check for early API revisions */
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if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
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return -1;
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som = data->payload.data.data_api2.som_no;
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debug("%s: som id: %u\n", __func__, som);
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opt = phytec_get_opt(data);
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if (!opt)
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return -1;
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if (som == PHYTEC_AM62X_SOM && soc_is_am62x())
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return 0;
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if (som == PHYTEC_AM64X_SOM && soc_is_am64x())
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return 0;
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return -1;
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}
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static u8 phytec_check_opt(struct phytec_eeprom_data *data, u8 option)
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{
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char *opt;
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if (!data)
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data = &eeprom_data;
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if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
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return PHYTEC_EEPROM_INVAL;
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if (option > 8)
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return PHYTEC_EEPROM_INVAL;
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opt = phytec_get_opt(data);
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if (opt)
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return PHYTEC_GET_OPTION(opt[option]);
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return PHYTEC_EEPROM_INVAL;
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}
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/*
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* Reads LPDDR4 ram size from EEPROM.
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*
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* returns:
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* - The size
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* - PHYTEC_EEPROM_INVAL when the data is invalid.
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*/
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u8 __maybe_unused phytec_get_am62_ddr_size(struct phytec_eeprom_data *data)
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{
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u8 ddr_id = phytec_check_opt(data, 3);
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pr_debug("%s: ddr id: %u\n", __func__, ddr_id);
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return ddr_id;
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}
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/*
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* Reads SPI-NOR flash size and type from EEPROM.
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*
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* returns:
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* - PHYTEC_EEPROM_VALUE_X if no SPI is poulated.
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* - Otherwise a board depended code for the size.
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* - PHYTEC_EEPROM_INVAL when the data is invalid.
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*/
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u8 __maybe_unused phytec_get_am62_spi(struct phytec_eeprom_data *data)
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{
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u8 spi = phytec_check_opt(data, 5);
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pr_debug("%s: spi: %u\n", __func__, spi);
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return spi;
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}
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/*
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* Reads Ethernet phy information from EEPROM.
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*
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* returns:
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* - 0x0 no ethernet phy is populated.
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* - 0x1 if 10/100/1000 MBit Phy is populated.
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* - PHYTEC_EEPROM_INVAL when the data is invalid.
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*/
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u8 __maybe_unused phytec_get_am62_eth(struct phytec_eeprom_data *data)
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{
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u8 eth = phytec_check_opt(data, 6);
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pr_debug("%s: eth: %u\n", __func__, eth);
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return eth;
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}
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/*
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* Reads RTC information from EEPROM.
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*
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* returns:
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* - 0 if no RTC is poulated.
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* - 1 if it is populated.
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* - PHYTEC_EEPROM_INVAL when the data is invalid.
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*/
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u8 __maybe_unused phytec_get_am62_rtc(struct phytec_eeprom_data *data)
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{
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u8 rtc = phytec_check_opt(data, 7);
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pr_debug("%s: rtc: %u\n", __func__, rtc);
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return rtc;
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}
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#else
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inline int __maybe_unused phytec_am62_detect(struct phytec_eeprom_data *data)
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{
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return -1;
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}
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inline u8 __maybe_unused
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phytec_get_am62_ddr_size(struct phytec_eeprom_data *data)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline u8 __maybe_unused phytec_get_am62_spi(struct phytec_eeprom_data *data)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline u8 __maybe_unused phytec_get_am62_eth(struct phytec_eeprom_data *data)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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inline u8 __maybe_unused phytec_get_am62_rtc(struct phytec_eeprom_data *data)
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{
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return PHYTEC_EEPROM_INVAL;
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}
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#endif
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