mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-28 05:43:57 +09:00
afaea1f56c
This adds the support for PDA detection as common code for Atmel boards. Using the one wire interface over GPIO , an EEPROM memory is read and compared to preprogrammed values for PDA screens TM4300, TM7000 and TM7000B. Once the PDA is detected, an environment variable is set accordingly. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017 Microchip
|
|
* Wenyou Yang <wenyou.yang@microchip.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <w1.h>
|
|
#include <w1-eeprom.h>
|
|
#include <dm/device-internal.h>
|
|
|
|
#define AT91_PDA_EEPROM_ID_OFFSET 15
|
|
#define AT91_PDA_EEPROM_ID_LENGTH 5
|
|
#define AT91_PDA_EEPROM_DEFAULT_BUS 0
|
|
|
|
void dummy(void)
|
|
{
|
|
}
|
|
|
|
#if defined CONFIG_W1
|
|
void at91_pda_detect(void)
|
|
{
|
|
struct udevice *bus, *dev;
|
|
u8 buf[AT91_PDA_EEPROM_ID_LENGTH + 1] = {0};
|
|
int ret;
|
|
int pda = 0;
|
|
|
|
ret = w1_get_bus(AT91_PDA_EEPROM_DEFAULT_BUS, &bus);
|
|
if (ret)
|
|
return;
|
|
|
|
for (device_find_first_child(bus, &dev);
|
|
dev;
|
|
device_find_next_child(&dev)) {
|
|
ret = device_probe(dev);
|
|
if (ret) {
|
|
continue;
|
|
} else {
|
|
ret = w1_eeprom_read_buf(dev, AT91_PDA_EEPROM_ID_OFFSET,
|
|
(u8 *)buf, AT91_PDA_EEPROM_ID_LENGTH);
|
|
if (ret)
|
|
return;
|
|
break;
|
|
}
|
|
}
|
|
pda = simple_strtoul((const char *)buf, NULL, 10);
|
|
|
|
switch (pda) {
|
|
case 7000:
|
|
if (buf[4] == 'B')
|
|
printf("PDA TM7000B detected\n");
|
|
else
|
|
printf("PDA TM7000 detected\n");
|
|
break;
|
|
case 4300:
|
|
printf("PDA TM4300 detected\n");
|
|
break;
|
|
case 5000:
|
|
printf("PDA TM5000 detected\n");
|
|
break;
|
|
}
|
|
env_set("pda", (const char *)buf);
|
|
}
|
|
#else
|
|
void at91_pda_detect(void)
|
|
{
|
|
}
|
|
#endif
|