mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 04:32:03 +00:00
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2013 Broadcom Corporation
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License as
|
||
|
|
* published by the Free Software Foundation version 2.
|
||
|
|
*
|
||
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
||
|
|
* kind, whether express or implied; without even the implied warranty
|
||
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
|
||
|
|
#include "kona.h"
|
||
|
|
|
||
|
|
static void __iomem *watchdog_base;
|
||
|
|
|
||
|
|
void bcm_kona_setup_restart(void)
|
||
|
|
{
|
||
|
|
struct device_node *np_wdog;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The assumption is that whoever calls bcm_kona_setup_restart()
|
||
|
|
* also needs a Kona Watchdog Timer entry in Device Tree, i.e. we
|
||
|
|
* report an error if the DT entry is missing.
|
||
|
|
*/
|
||
|
|
np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
|
||
|
|
if (!np_wdog) {
|
||
|
|
pr_err("brcm,kona-wdt not found in DT, reboot disabled\n");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
watchdog_base = of_iomap(np_wdog, 0);
|
||
|
|
WARN(!watchdog_base, "failed to map watchdog base");
|
||
|
|
of_node_put(np_wdog);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define SECWDOG_OFFSET 0x00000000
|
||
|
|
#define SECWDOG_RESERVED_MASK 0xE2000000
|
||
|
|
#define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000
|
||
|
|
#define SECWDOG_EN_MASK 0x08000000
|
||
|
|
#define SECWDOG_SRSTEN_MASK 0x04000000
|
||
|
|
#define SECWDOG_CLKS_SHIFT 20
|
||
|
|
#define SECWDOG_LOCK_SHIFT 0
|
||
|
|
|
||
|
|
void bcm_kona_restart(enum reboot_mode mode, const char *cmd)
|
||
|
|
{
|
||
|
|
uint32_t val;
|
||
|
|
|
||
|
|
if (!watchdog_base)
|
||
|
|
panic("Watchdog not mapped. Reboot failed.\n");
|
||
|
|
|
||
|
|
/* Enable watchdog2 with very short timeout. */
|
||
|
|
val = readl(watchdog_base + SECWDOG_OFFSET);
|
||
|
|
val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
|
||
|
|
val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
|
||
|
|
(0x8 << SECWDOG_CLKS_SHIFT) |
|
||
|
|
(0x8 << SECWDOG_LOCK_SHIFT);
|
||
|
|
writel(val, watchdog_base + SECWDOG_OFFSET);
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
;
|
||
|
|
}
|