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