forked from Imagelibrary/rtems
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* GPTIMER Watchdog timer routines. On some systems the first GPTIMER
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* core's last Timer instance underflow signal is connected to system
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* reset.
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*
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* COPYRIGHT (c) 2012.
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* Cobham Gaisler AB.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bsp.h>
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#include <bsp/leon3.h>
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#include <bsp/watchdog.h>
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struct gptimer_watchdog_priv {
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gptimer *regs;
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gptimer_timer *timer;
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int timerno;
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};
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struct gptimer_watchdog_priv bsp_watchdogs[1];
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int bsp_watchdog_count = 0;
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int bsp_watchdog_init(void)
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{
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int timercnt;
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if (!LEON3_Timer_Regs)
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return 0;
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/* Get Watchdogs in system, this is implemented for one GPTIMER core
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* only.
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*
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* First watchdog is a special case, we can get the first timer core by
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* looking at LEON3_Timer_Regs, the watchdog within a timer core is
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* always the last timer. Unfortunately we can not know it the watchdog
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* functionality is available or not, we assume that it is if we
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* reached this function.
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*/
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bsp_watchdogs[0].regs = LEON3_Timer_Regs;
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/* Find Timer that has watchdog functionality */
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timercnt = grlib_load_32(&bsp_watchdogs[0].regs->config) & 0x7;
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if (timercnt < 2) /* First timer system clock timer */
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return 0;
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bsp_watchdogs[0].timerno = timercnt - 1;
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bsp_watchdogs[0].timer = &bsp_watchdogs[0].regs->timer[bsp_watchdogs[0].timerno];
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bsp_watchdog_count = 1;
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return bsp_watchdog_count;
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}
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void bsp_watchdog_reload(int watchdog, unsigned int reload_value)
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{
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gptimer_timer *timer;
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uint32_t tctrl;
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if (bsp_watchdog_count == 0)
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bsp_watchdog_init();
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if (bsp_watchdog_count <= watchdog)
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return;
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/* Kick watchdog, and clear interrupt pending bit */
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timer = bsp_watchdogs[watchdog].timer;
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grlib_store_32(&timer->trldval, reload_value);
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tctrl = grlib_load_32(&timer->tctrl);
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tctrl |= GPTIMER_TCTRL_LD | GPTIMER_TCTRL_EN;
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tctrl &= ~GPTIMER_TCTRL_IP;
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grlib_store_32(&timer->tctrl, tctrl);
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}
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void bsp_watchdog_stop(int watchdog)
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{
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if (bsp_watchdog_count == 0)
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bsp_watchdog_init();
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if (bsp_watchdog_count <= watchdog)
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return;
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/* Stop watchdog timer */
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grlib_store_32(&bsp_watchdogs[watchdog].timer->tctrl, 0);
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}
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/* Use watchdog timer to reset system */
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void bsp_watchdog_system_reset(void)
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{
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sparc_disable_interrupts();
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bsp_watchdog_reload(0, 1);
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}
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