[486c329] | 1 | /* |
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| 2 | *------------------------------------------------------------------- |
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| 3 | * |
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| 4 | * This file contains the subroutines necessary to initalize |
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| 5 | * and maintain the MAX791 based watchdog timer used on efi68k |
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| 6 | * |
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| 7 | * This file has been created by John S. Gwynne for the efi68k |
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| 8 | * project. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms are permitted |
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| 11 | * provided that the following conditions are met: |
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| 12 | * 1. Redistribution of source code and documentation must retain |
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| 13 | * the above authorship, this list of conditions and the |
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| 14 | * following disclaimer. |
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| 15 | * 2. The name of the author may not be used to endorse or promote |
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| 16 | * products derived from this software without specific prior |
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| 17 | * written permission. |
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| 18 | * |
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| 19 | * This software is provided "AS IS" without warranty of any kind, |
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| 20 | * either expressed or implied, including, but not limited to, the |
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| 21 | * implied warranties of merchantability, title and fitness for a |
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| 22 | * particular purpose. |
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| 23 | * |
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| 24 | *------------------------------------------------------------------ |
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| 25 | * |
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| 26 | * $Id$ |
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| 27 | */ |
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| 28 | #include <bsp.h> |
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| 29 | |
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| 30 | void wd_interrupt(void) { |
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| 31 | /* toggle WDI of the MAX791. A more sophisticated routine |
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| 32 | can be inserted into the exception table after booting. */ |
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| 33 | |
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| 34 | /* 3 changes guaranty a pulse independent of initial state */ |
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| 35 | *MCR |= OUT1; |
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| 36 | *MCR &= ~OUT1; |
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| 37 | *MCR |= OUT1; |
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| 38 | } |
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| 39 | |
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| 40 | /* _catchWDint is the interrupt front-end */ |
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| 41 | extern void _catchWDint(); |
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| 42 | asm(" .text |
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| 43 | .align 2 |
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| 44 | .globl _catchWDint |
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| 45 | _catchWDint: |
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| 46 | lea %sp@(4),%sp /* pop return address */ |
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| 47 | moveml %d0-%d7/%a0-%a6,%sp@- /* save registers */ |
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| 48 | jbsr wd_interrupt |
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| 49 | moveml %sp@+,%d0-%d7/%a0-%a6 |
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| 50 | rte |
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| 51 | "); |
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| 52 | |
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| 53 | void watch_dog_init(void) { |
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| 54 | set_vector(_catchWDint, WD_ISR_LEVEL+24, 0); |
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| 55 | } |
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