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/*
* (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
*
* Developed for DENX Software Engineering GmbH
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
/* This test verifies if the reason of last reset was an abnormal voltage
* condition, than it performs watchdog test, measuing time required to
* trigger watchdog reset.
*/
#include <post.h>
#if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
#include <watchdog.h>
#include <asm/ppc4xx-gpio.h>
#include <asm/io.h>
static uint watchdog_magic_read(void)
{
return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
CONFIG_SYS_WATCHDOG_MAGIC_MASK;
}
static void watchdog_magic_write(uint value)
{
out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
(in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
}
int sysmon1_post_test(int flags)
{
if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
/*
* 3.1. GPIO62 is low
* Assuming system voltage failure.
*/
post_log("sysmon1 Abnormal voltage detected (GPIO62)\n");
post_log("POST sysmon1 FAILED\n");
return 1;
} else {
post_log("sysmon1 PASSED\n");
}
return 0;
}
int lwmon5_watchdog_post_test(int flags)
{
/* On each reset scratch register 1 should be tested,
* but first test GPIO62:
*/
if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
/* 3.1. GPIO62 is low
* Assuming system voltage failure.
*/
/* 3.1.1. Set scratch register 1 to 0x0000xxxx */
watchdog_magic_write(0);
/* 3.1.2. Mark test as failed due to voltage?! */
return 1;
}
if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
/* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
* Assuming PowerOn
*/
int ints;
ulong base;
ulong time;
/* 3.2.1. Set magic value to scratch register */
watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
ints = disable_interrupts ();
/* 3.2.2. strobe watchdog once */
WATCHDOG_RESET();
out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
/* 3.2.3. save time of strobe in scratch register 2 */
base = post_time_ms (0);
/* 3.2.4. Wait for 150 ms (enough for reset to happen) */
while ((time = post_time_ms (base)) < 150)
out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
if (ints)
enable_interrupts ();
/* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
* into scratch register 1
*/
watchdog_magic_write(0);
/* 3.2.6. Mark test as failed. */
post_log("hw watchdog time : %u ms, failed ", time);
return 2;
} else {
/* 3.3. Scratch register matches magic value 0x1248xxxx
* Assume this is watchdog-initiated reset
*/
ulong time;
/* 3.3.1. So, the test succeed, save measured time to syslog. */
time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
if (time > 90 ) { /* ms*/
post_log("hw watchdog time : %u ms, passed ", time);
/* 3.3.2. Set scratch register 1 to 0x0000xxxx */
watchdog_magic_write(0);
return 0;
} else {
/*test minimum watchdogtime */
post_log("hw watchdog time : %u ms, failed ", time);
return 2;
}
}
return -1;
}
#endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */
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