57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
|
|
* OMAP2+ MPU WD_TIMER-specific code
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/io.h>
|
|
#include <linux/err.h>
|
|
|
|
#include <plat/omap_hwmod.h>
|
|
|
|
#include "wd_timer.h"
|
|
|
|
/*
|
|
* In order to avoid any assumptions from bootloader regarding WDT
|
|
* settings, WDT module is reset during init. This enables the watchdog
|
|
* timer. Hence it is required to disable the watchdog after the WDT reset
|
|
* during init. Otherwise the system would reboot as per the default
|
|
* watchdog timer registers settings.
|
|
*/
|
|
#define OMAP_WDT_WPS 0x34
|
|
#define OMAP_WDT_SPR 0x48
|
|
|
|
|
|
int omap2_wd_timer_disable(struct omap_hwmod *oh)
|
|
{
|
|
void __iomem *base;
|
|
|
|
if (!oh) {
|
|
pr_err("%s: Could not look up wdtimer_hwmod\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
base = omap_hwmod_get_mpu_rt_va(oh);
|
|
if (!base) {
|
|
pr_err("%s: Could not get the base address for %s\n",
|
|
oh->name, __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* sequence required to disable watchdog */
|
|
__raw_writel(0xAAAA, base + OMAP_WDT_SPR);
|
|
while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
|
|
cpu_relax();
|
|
|
|
__raw_writel(0x5555, base + OMAP_WDT_SPR);
|
|
while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
|
|
cpu_relax();
|
|
|
|
return 0;
|
|
}
|
|
|