forked from Imagelibrary/rtems
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/* 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.org/license/LICENSE.
|
|
*/
|
|
|
|
#include <bsp.h>
|
|
#include <bsp/watchdog.h>
|
|
#include <grlib/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);
|
|
}
|