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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2021
* Köry Maincent, Bootlin, <[email protected]>
*/
#include <stdio.h>
#include <malloc.h>
#include <i2c.h>
#include <extension_board.h>
#include <vsprintf.h>
#include <linux/delay.h>
#include "cape_detect.h"
struct name_mapping {
char part_number[17];
char version[5];
char overlay[64];
};
static struct name_mapping extension_mapping[] = {
{
"BB-GREEN-HDMI",
"00A0",
"am335x-bone-hdmi-00a0.dtbo",
}
};
static void set_cape_overlay(char *overlay, char *part_number, char *version)
{
struct name_mapping *mapping;
for (int i = 0; i < ARRAY_SIZE(extension_mapping); i++) {
mapping = &extension_mapping[i];
if (strncmp(mapping->part_number, part_number,
sizeof(mapping->part_number)))
continue;
if (strncmp(mapping->version, version,
sizeof(mapping->version)))
continue;
strlcpy(overlay, mapping->overlay, sizeof(mapping->overlay));
return;
}
/* Use default name extracted from the EEPROM */
snprintf(overlay, sizeof(extension_mapping[0].overlay), "%s-%s.dtbo",
part_number, version);
}
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;
}
}
static int ti_extension_board_scan(struct udevice *dev,
struct alist *extension_list)
{
unsigned char addr;
int num_capes = 0;
for (addr = CAPE_EEPROM_FIRST_ADDR; addr <= CAPE_EEPROM_LAST_ADDR; addr++) {
struct am335x_cape_eeprom_id eeprom_header;
char process_cape_part_number[17] = {'0'};
char process_cape_version[5] = {'0'};
struct extension cape = {0};
struct udevice *dev;
u8 cursor = 0;
int ret, i;
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);
/* Need 5ms (tWR) to complete internal write */
mdelay(6);
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 */
strlcpy(process_cape_part_number, eeprom_header.part_number,
sizeof(process_cape_part_number));
/* 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 */
strlcpy(process_cape_version, eeprom_header.version,
sizeof(process_cape_version));
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);
set_cape_overlay(cape.overlay, process_cape_part_number,
process_cape_version);
strlcpy(cape.name, eeprom_header.board_name,
sizeof(eeprom_header.board_name));
strlcpy(cape.version, process_cape_version,
sizeof(process_cape_version));
strlcpy(cape.owner, eeprom_header.manufacturer,
sizeof(eeprom_header.manufacturer) + 1);
if (!alist_add(extension_list, cape))
return -ENOMEM;
num_capes++;
}
return num_capes;
}
U_BOOT_EXTENSION(cape, ti_extension_board_scan);
U_BOOT_DRVINFO(cape) = {
.name = "cape",
};
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