2 * OMAP2+ MPU WD_TIMER-specific code
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
10 #include <linux/kernel.h>
12 #include <linux/err.h>
14 #include <plat/omap_hwmod.h>
17 * In order to avoid any assumptions from bootloader regarding WDT
18 * settings, WDT module is reset during init. This enables the watchdog
19 * timer. Hence it is required to disable the watchdog after the WDT reset
20 * during init. Otherwise the system would reboot as per the default
21 * watchdog timer registers settings.
23 #define OMAP_WDT_WPS 0x34
24 #define OMAP_WDT_SPR 0x48
27 int omap2_wd_timer_disable(struct omap_hwmod *oh)
32 pr_err("%s: Could not look up wdtimer_hwmod\n", __func__);
36 base = omap_hwmod_get_mpu_rt_va(oh);
38 pr_err("%s: Could not get the base address for %s\n",
43 /* sequence required to disable watchdog */
44 __raw_writel(0xAAAA, base + OMAP_WDT_SPR);
45 while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)
48 __raw_writel(0x5555, base + OMAP_WDT_SPR);
49 while (__raw_readl(base + OMAP_WDT_WPS) & 0x10)