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/* SPDX-License-Identifier: BSD-2-Clause */
/* 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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp.h>
#include <bsp/leon3.h>
#include <bsp/watchdog.h>
struct gptimer_watchdog_priv {
gptimer *regs;
gptimer_timer *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 = LEON3_Timer_Regs;
/* Find Timer that has watchdog functionality */
timercnt = grlib_load_32(&bsp_watchdogs[0].regs->config) & 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)
{
gptimer_timer *timer;
uint32_t tctrl;
if (bsp_watchdog_count == 0)
bsp_watchdog_init();
if (bsp_watchdog_count <= watchdog)
return;
/* Kick watchdog, and clear interrupt pending bit */
timer = bsp_watchdogs[watchdog].timer;
grlib_store_32(&timer->trldval, reload_value);
tctrl = grlib_load_32(&timer->tctrl);
tctrl |= GPTIMER_TCTRL_LD | GPTIMER_TCTRL_EN;
tctrl &= ~GPTIMER_TCTRL_IP;
grlib_store_32(&timer->tctrl, tctrl);
}
void bsp_watchdog_stop(int watchdog)
{
if (bsp_watchdog_count == 0)
bsp_watchdog_init();
if (bsp_watchdog_count <= watchdog)
return;
/* Stop watchdog timer */
grlib_store_32(&bsp_watchdogs[watchdog].timer->tctrl, 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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