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bcm2835_wdt: support for the BCM2835/2836 watchdog

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Signed-off-by: Paolo Pisati <p.pisati@gmail.com>
This commit is contained in:
Paolo Pisati
2017-02-10 17:28:05 +01:00
committed by Tom Rini
parent 3e16705d3e
commit 45a6d231b2
5 changed files with 70 additions and 3 deletions
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21
arch/arm/mach-bcm283x/reset.c
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@@ -21,18 +21,33 @@
*/
#define BCM2835_WDOG_RSTS_RASPBERRYPI_HALT 0x555
/* max ticks timeout */
#define BCM2835_WDOG_MAX_TIMEOUT 0x000fffff
#ifdef CONFIG_BCM2835_WDT
extern void hw_watchdog_disable(void);
#else
void hw_watchdog_disable(void) {}
#endif
__efi_runtime_data struct bcm2835_wdog_regs *wdog_regs =
(struct bcm2835_wdog_regs *)BCM2835_WDOG_PHYSADDR;
void __efi_runtime reset_cpu(ulong addr)
void __efi_runtime reset_cpu(ulong ticks)
{
uint32_t rstc;
uint32_t rstc, timeout;
if (ticks == 0) {
hw_watchdog_disable();
timeout = RESET_TIMEOUT;
} else
timeout = ticks & BCM2835_WDOG_MAX_TIMEOUT;
rstc = readl(&wdog_regs->rstc);
rstc &= ~BCM2835_WDOG_RSTC_WRCFG_MASK;
rstc |= BCM2835_WDOG_RSTC_WRCFG_FULL_RESET;
writel(BCM2835_WDOG_PASSWORD | RESET_TIMEOUT, &wdog_regs->wdog);
writel(BCM2835_WDOG_PASSWORD | timeout, &wdog_regs->wdog);
writel(BCM2835_WDOG_PASSWORD | rstc, &wdog_regs->rstc);
}

4
board/raspberrypi/rpi/rpi.c
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@@ -23,6 +23,7 @@
#ifdef CONFIG_ARM64
#include <asm/armv8/mmu.h>
#endif
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -455,6 +456,9 @@ static void rpi_disable_inactive_uart(void)
int board_init(void)
{
#ifdef CONFIG_HW_WATCHDOG
hw_watchdog_init();
#endif
#ifndef CONFIG_PL01X_SERIAL
rpi_disable_inactive_uart();
#endif

12
drivers/watchdog/Kconfig
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@@ -1,5 +1,17 @@
menu "Watchdog Timer Support"
config HW_WATCHDOG
bool
config BCM2835_WDT
bool "Enable BCM2835/2836 watchdog driver"
select HW_WATCHDOG
help
Say Y here to enable the BCM2835/2836 watchdog
This provides basic infrastructure to support BCM2835/2836 watchdog
hardware, with a max timeout of ~15secs.
config ULP_WATCHDOG
bool "i.MX7ULP watchdog"
help

1
drivers/watchdog/Makefile
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@@ -18,3 +18,4 @@ obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
obj-$(CONFIG_WDT) += wdt-uclass.o
obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o

35
drivers/watchdog/bcm2835_wdt.c Normal file
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@@ -0,0 +1,35 @@
/*
* Watchdog driver for Broadcom BCM2835
*
* Copyright (C) 2017 Paolo Pisati <p.pisati@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <efi_loader.h>
#include <asm/io.h>
#include <asm/arch/wdog.h>
#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
#define MAX_TIMEOUT 0xf /* ~15s */
static __efi_runtime_data bool enabled = true;
extern void reset_cpu(ulong ticks);
void hw_watchdog_reset(void)
{
if (enabled)
reset_cpu(SECS_TO_WDOG_TICKS(MAX_TIMEOUT));
}
void hw_watchdog_init(void)
{
hw_watchdog_reset();
}
void __efi_runtime hw_watchdog_disable(void)
{
enabled = false;
}