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/*
* Copyright (c) 2011-2013 Xilinx Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include <asm/microblaze_intc.h>
#include <asm/processor.h>
#include <watchdog.h>
#define XWT_CSR0_WRS_MASK 0x00000008 /* Reset status Mask */
#define XWT_CSR0_WDS_MASK 0x00000004 /* Timer state Mask */
#define XWT_CSR0_EWDT1_MASK 0x00000002 /* Enable bit 1 Mask*/
#define XWT_CSRX_EWDT2_MASK 0x00000001 /* Enable bit 2 Mask */
struct watchdog_regs {
u32 twcsr0; /* 0x0 */
u32 twcsr1; /* 0x4 */
u32 tbr; /* 0x8 */
};
static struct watchdog_regs *watchdog_base =
(struct watchdog_regs *)CONFIG_WATCHDOG_BASEADDR;
void hw_watchdog_reset(void)
{
u32 reg;
/* Read the current contents of TCSR0 */
reg = readl(&watchdog_base->twcsr0);
/* Clear the watchdog WDS bit */
if (reg & (XWT_CSR0_EWDT1_MASK | XWT_CSRX_EWDT2_MASK))
writel(reg | XWT_CSR0_WDS_MASK, &watchdog_base->twcsr0);
}
void hw_watchdog_disable(void)
{
u32 reg;
/* Read the current contents of TCSR0 */
reg = readl(&watchdog_base->twcsr0);
writel(reg & ~XWT_CSR0_EWDT1_MASK, &watchdog_base->twcsr0);
writel(~XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
puts("Watchdog disabled!\n");
}
static void hw_watchdog_isr(void *arg)
{
hw_watchdog_reset();
}
int hw_watchdog_init(void)
{
int ret;
writel((XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK | XWT_CSR0_EWDT1_MASK),
&watchdog_base->twcsr0);
writel(XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
ret = install_interrupt_handler(CONFIG_WATCHDOG_IRQ,
hw_watchdog_isr, NULL);
if (ret)
return 1;
return 0;
}
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