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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2024 PHYTEC Messtechnik GmbH
* Author: Daniel Schultz <d.schultz@phytec.de>
*/
#include <asm/arch/hardware.h>
#include "am6_som_detection.h"
extern struct phytec_eeprom_data eeprom_data;
#if IS_ENABLED(CONFIG_PHYTEC_AM62_SOM_DETECTION) || \
IS_ENABLED(CONFIG_PHYTEC_AM62A_SOM_DETECTION) || \
IS_ENABLED(CONFIG_PHYTEC_AM64_SOM_DETECTION)
/* Check if the SoM is actually one of the following products:
* - phyCORE-AM62x
* - phyCORE-AM62Ax
* - phyCORE-AM64x
*
* Returns 0 in case it's a known SoM. Otherwise, returns -1.
*/
int phytec_am6_detect(struct phytec_eeprom_data *data)
{
char *opt;
u8 som;
if (!data)
data = &eeprom_data;
/* We cannot do the check for early API revisions */
if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return -1;
som = data->payload.data.data_api2.som_no;
debug("%s: som id: %u\n", __func__, som);
opt = phytec_get_opt(data);
if (!opt)
return -1;
if (som == PHYTEC_AM62X_SOM && soc_is_am62x())
return 0;
if (som == PHYTEC_AM62AX_SOM && soc_is_am62ax())
return 0;
if (som == PHYTEC_AM64X_SOM && soc_is_am64x())
return 0;
return -1;
}
static u8 phytec_check_opt(struct phytec_eeprom_data *data, u8 option)
{
char *opt;
if (!data)
data = &eeprom_data;
if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;
if (option > 8)
return PHYTEC_EEPROM_INVAL;
opt = phytec_get_opt(data);
if (opt)
return PHYTEC_GET_OPTION(opt[option]);
return PHYTEC_EEPROM_INVAL;
}
/*
* Reads LPDDR4 ram size from EEPROM.
*
* returns:
* - The size
* - PHYTEC_EEPROM_INVAL when the data is invalid.
*/
u8 __maybe_unused phytec_get_am6_ddr_size(struct phytec_eeprom_data *data)
{
u8 ddr_id = phytec_check_opt(data, 3);
pr_debug("%s: ddr id: %u\n", __func__, ddr_id);
return ddr_id;
}
/*
* Reads SPI-NOR flash size and type from EEPROM.
*
* returns:
* - PHYTEC_EEPROM_VALUE_X if no SPI is poulated.
* - Otherwise a board depended code for the size.
* - PHYTEC_EEPROM_INVAL when the data is invalid.
*/
u8 __maybe_unused phytec_get_am6_spi(struct phytec_eeprom_data *data)
{
u8 spi = phytec_check_opt(data, 5);
pr_debug("%s: spi: %u\n", __func__, spi);
return spi;
}
/*
* Reads Ethernet phy information from EEPROM.
*
* returns:
* - 0x0 no ethernet phy is populated.
* - 0x1 if 10/100/1000 MBit Phy is populated.
* - PHYTEC_EEPROM_INVAL when the data is invalid.
*/
u8 __maybe_unused phytec_get_am6_eth(struct phytec_eeprom_data *data)
{
u8 eth = phytec_check_opt(data, 6);
pr_debug("%s: eth: %u\n", __func__, eth);
return eth;
}
/*
* Reads RTC information from EEPROM.
*
* returns:
* - 0 if no RTC is poulated.
* - 1 if it is populated.
* - PHYTEC_EEPROM_INVAL when the data is invalid.
*/
u8 __maybe_unused phytec_get_am6_rtc(struct phytec_eeprom_data *data)
{
u8 rtc = phytec_check_opt(data, 7);
pr_debug("%s: rtc: %u\n", __func__, rtc);
return rtc;
}
#else
inline int __maybe_unused phytec_am6_detect(struct phytec_eeprom_data *data)
{
return -1;
}
inline u8 __maybe_unused
phytec_get_am6_ddr_size(struct phytec_eeprom_data *data)
{
return PHYTEC_EEPROM_INVAL;
}
inline u8 __maybe_unused phytec_get_am6_spi(struct phytec_eeprom_data *data)
{
return PHYTEC_EEPROM_INVAL;
}
inline u8 __maybe_unused phytec_get_am6_eth(struct phytec_eeprom_data *data)
{
return PHYTEC_EEPROM_INVAL;
}
inline u8 __maybe_unused phytec_get_am6_rtc(struct phytec_eeprom_data *data)
{
return PHYTEC_EEPROM_INVAL;
}
#endif
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