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/* GPTIMER Watchdog timer routines. On some systems the first GPTIMER
* core's last Timer instance underflow signal is connected to system
* reset.
*
* COPYRIGHT (c) 2012.
* Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <bsp.h>
#include <watchdog.h>
#include <grlib.h>
extern volatile struct gptimer_regs *LEON3_Timer_Regs;
struct gptimer_watchdog_priv {
struct gptimer_regs *regs;
struct gptimer_timer_regs *timer;
int timerno;
};
struct gptimer_watchdog_priv bsp_watchdogs[1];
int bsp_watchdog_count = 0;
int bsp_watchdog_init(void)
{
int timercnt;
if (!LEON3_Timer_Regs)
return 0;
/* Get Watchdogs in system, this is implemented for one GPTIMER core
* only.
*
* First watchdog is a special case, we can get the first timer core by
* looking at LEON3_Timer_Regs, the watchdog within a timer core is
* always the last timer. Unfortunately we can not know it the watchdog
* functionality is available or not, we assume that it is if we
* reached this function.
*/
bsp_watchdogs[0].regs = (struct gptimer_regs *)LEON3_Timer_Regs;
/* Find Timer that has watchdog functionality */
timercnt = bsp_watchdogs[0].regs->cfg & 0x7;
if (timercnt < 2) /* First timer system clock timer */
return 0;
bsp_watchdogs[0].timerno = timercnt - 1;
bsp_watchdogs[0].timer = &bsp_watchdogs[0].regs->timer[bsp_watchdogs[0].timerno];
bsp_watchdog_count = 1;
return bsp_watchdog_count;
}
void bsp_watchdog_reload(int watchdog, unsigned int reload_value)
{
if (bsp_watchdog_count == 0)
bsp_watchdog_init();
if (bsp_watchdog_count <= watchdog)
return;
/* Kick watchdog, and clear interrupt pending bit */
bsp_watchdogs[watchdog].timer->reload = reload_value;
bsp_watchdogs[watchdog].timer->ctrl =
(GPTIMER_TIMER_CTRL_LD | GPTIMER_TIMER_CTRL_EN) |
(bsp_watchdogs[watchdog].timer->ctrl & ~(1<<4));
}
void bsp_watchdog_stop(int watchdog)
{
if (bsp_watchdog_count == 0)
bsp_watchdog_init();
if (bsp_watchdog_count <= watchdog)
return;
/* Stop watchdog timer */
bsp_watchdogs[watchdog].timer->ctrl = 0;
}
/* Use watchdog timer to reset system */
void bsp_watchdog_system_reset(void)
{
sparc_disable_interrupts();
bsp_watchdog_reload(0, 1);
}
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