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// 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 <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;
#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 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++)
if (ptr[i] != 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:
pr_err("%s: Invalid SoM type: %i", __func__, api2->som_type);
return;
};
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;
}
u8 __maybe_unused phytec_get_rev(struct phytec_eeprom_data *data)
{
struct phytec_api2_data *api2;
if (!data)
data = &eeprom_data;
if (data->api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;
api2 = &data->data.data_api2;
return api2->pcb_rev;
}
u8 __maybe_unused phytec_get_som_type(struct phytec_eeprom_data *data)
{
if (!data)
data = &eeprom_data;
if (data->api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;
return data->data.data_api2.som_type;
}
#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;
}
u8 __maybe_unused phytec_get_rev(struct phytec_eeprom_data *data)
{
return PHYTEC_EEPROM_INVAL;
}
#endif /* IS_ENABLED(CONFIG_PHYTEC_SOM_DETECTION) */
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