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/*
* Copyright (C) 2012 Altera Corporation <www.altera.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <io.h>
#include <init.h>
#include <restart.h>
#include <mach/socfpga-regs.h>
#include <mach/reset-manager.h>
/* Disable the watchdog (toggle reset to watchdog) */
void watchdog_disable(void)
{
void __iomem *rm = (void *)CYCLONE5_RSTMGR_ADDRESS;
uint32_t val;
/* assert reset for watchdog */
val = readl(rm + RESET_MGR_PER_MOD_RESET_OFS);
val |= 1 << RSTMGR_PERMODRST_L4WD0_LSB;
writel(val, rm + RESET_MGR_PER_MOD_RESET_OFS);
/* deassert watchdog from reset (watchdog in not running state) */
val = readl(rm + RESET_MGR_PER_MOD_RESET_OFS);
val &= ~(1 << RSTMGR_PERMODRST_L4WD0_LSB);
writel(val, rm + RESET_MGR_PER_MOD_RESET_OFS);
}
/* Write the reset manager register to cause reset */
static void __noreturn socfpga_restart_soc(struct restart_handler *rst)
{
/* request a warm reset */
writel((1 << RSTMGR_CTRL_SWWARMRSTREQ_LSB),
CYCLONE5_RSTMGR_ADDRESS + RESET_MGR_CTRL_OFS);
/*
* infinite loop here as watchdog will trigger and reset
* the processor
*/
hang();
}
static int restart_register_feature(void)
{
restart_handler_register_fn(socfpga_restart_soc);
return 0;
}
coredevice_initcall(restart_register_feature);
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