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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2021
* Köry Maincent, Bootlin, <kory.maincent@bootlin.com>
*/
#include <common.h>
#include <malloc.h>
#include <i2c.h>
#include <extension_board.h>
#include "cape_detect.h"
static void sanitize_field(char *text, size_t size)
{
char *c = NULL;
for (c = text; c < text + (int)size; c++) {
if (*c == 0xFF)
*c = 0;
}
}
int extension_board_scan(struct list_head *extension_list)
{
struct extension *cape;
struct am335x_cape_eeprom_id eeprom_header;
int num_capes = 0;
int ret, i;
struct udevice *dev;
unsigned char addr;
char process_cape_part_number[17] = {'0'};
char process_cape_version[5] = {'0'};
uint8_t cursor = 0;
for (addr = CAPE_EEPROM_FIRST_ADDR; addr <= CAPE_EEPROM_LAST_ADDR; addr++) {
ret = i2c_get_chip_for_busnum(CONFIG_CAPE_EEPROM_BUS_NUM, addr, 1, &dev);
if (ret)
continue;
/* Move the read cursor to the beginning of the EEPROM */
dm_i2c_write(dev, 0, &cursor, 1);
ret = dm_i2c_read(dev, 0, (uint8_t *)&eeprom_header,
sizeof(struct am335x_cape_eeprom_id));
if (ret) {
printf("Cannot read i2c EEPROM\n");
continue;
}
if (eeprom_header.header != CAPE_MAGIC)
continue;
sanitize_field(eeprom_header.board_name, sizeof(eeprom_header.board_name));
sanitize_field(eeprom_header.version, sizeof(eeprom_header.version));
sanitize_field(eeprom_header.manufacturer, sizeof(eeprom_header.manufacturer));
sanitize_field(eeprom_header.part_number, sizeof(eeprom_header.part_number));
/* Process cape part_number */
memset(process_cape_part_number, 0, sizeof(process_cape_part_number));
strncpy(process_cape_part_number, eeprom_header.part_number, 16);
/* Some capes end with '.' */
for (i = 15; i >= 0; i--) {
if (process_cape_part_number[i] == '.')
process_cape_part_number[i] = '\0';
else
break;
}
/* Process cape version */
memset(process_cape_version, 0, sizeof(process_cape_version));
strncpy(process_cape_version, eeprom_header.version, 4);
for (i = 0; i < 4; i++) {
if (process_cape_version[i] == 0)
process_cape_version[i] = '0';
}
printf("BeagleBone Cape: %s (0x%x)\n", eeprom_header.board_name, addr);
cape = calloc(1, sizeof(struct extension));
if (!cape) {
printf("Error in memory allocation\n");
return num_capes;
}
snprintf(cape->overlay, sizeof(cape->overlay), "%s-%s.dtbo",
process_cape_part_number, process_cape_version);
strncpy(cape->name, eeprom_header.board_name, 32);
strncpy(cape->version, process_cape_version, 4);
strncpy(cape->owner, eeprom_header.manufacturer, 16);
list_add_tail(&cape->list, extension_list);
num_capes++;
}
return num_capes;
}
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