ih_int7.c

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00001 /*
00002  * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00073 #include <dev/irqreg.h>
00074 
00079 
00080 static int AvrInterrupt7Ctl(int cmd, void *param);
00081 
00082 IRQ_HANDLER sig_INTERRUPT7 = {
00083 #ifdef NUT_PERFMON
00084     0,                          /* Interrupt counter, ir_count. */
00085 #endif
00086     NULL,                       /* Passed argument, ir_arg. */
00087     NULL,                       /* Handler subroutine, ir_handler. */
00088     AvrInterrupt7Ctl            /* Interrupt control, ir_ctl. */
00089 };
00090 
00108 static int AvrInterrupt7Ctl(int cmd, void *param)
00109 {
00110     int rc = 0;
00111     u_int *ival = (u_int *) param;
00112     int enabled = bit_is_set(EIMSK, INT7);
00113     u_char bval;
00114 
00115     /* Disable interrupt. */
00116     cbi(EIMSK, INT7);
00117 
00118     switch (cmd) {
00119     case NUT_IRQCTL_INIT:
00120         /* Initialize to low level triggered. */
00121         cbi(EICR, ISC70);
00122         cbi(EICR, ISC71);
00123     case NUT_IRQCTL_CLEAR:
00124         /* Clear any pending interrupt. */
00125         outb(EIFR, _BV(INTF7));
00126         break;
00127     case NUT_IRQCTL_STATUS:
00128         if (bit_is_set(EIFR, INTF7)) {
00129             *ival = 1;
00130         } else {
00131             *ival = 0;
00132         }
00133         if (enabled) {
00134             *ival |= 0x80;
00135         }
00136         break;
00137     case NUT_IRQCTL_ENABLE:
00138         enabled = 1;
00139         break;
00140     case NUT_IRQCTL_DISABLE:
00141         enabled = 0;
00142         break;
00143     case NUT_IRQCTL_GETMODE:
00144         bval = inb(EICR) & _BV(ISC71 | ISC70);
00145         if (bval == _BV(ISC71)) {
00146             *ival = NUT_IRQMODE_FALLINGEDGE;
00147         } else if (bval == _BV(ISC70)) {
00148             *ival = NUT_IRQMODE_EDGE;
00149         } else if (bval == _BV(ISC71 | ISC70)) {
00150             *ival = NUT_IRQMODE_RISINGEDGE;
00151         } else {
00152             *ival = NUT_IRQMODE_LOWLEVEL;
00153         }
00154         break;
00155     case NUT_IRQCTL_SETMODE:
00156         if (*ival == NUT_IRQMODE_LOWLEVEL) {
00157             cbi(EICR, ISC70);
00158             cbi(EICR, ISC71);
00159         } else if (*ival == NUT_IRQMODE_EDGE) {
00160             sbi(EICR, ISC70);
00161             cbi(EICR, ISC71);
00162         } else if (*ival == NUT_IRQMODE_FALLINGEDGE) {
00163             cbi(EICR, ISC70);
00164             sbi(EICR, ISC71);
00165         } else if (*ival == NUT_IRQMODE_RISINGEDGE) {
00166             sbi(EICR, ISC70);
00167             sbi(EICR, ISC71);
00168         } else {
00169             rc = -1;
00170         }
00171         break;
00172     case NUT_IRQCTL_GETPRIO:
00173         *ival = 7;
00174         break;
00175 #ifdef NUT_PERFMON
00176     case NUT_IRQCTL_GETCOUNT:
00177         *ival = (u_int) sig_INTERRUPT7.ir_count;
00178         sig_INTERRUPT7.ir_count = 0;
00179         break;
00180 #endif
00181     default:
00182         rc = -1;
00183         break;
00184     }
00185 
00186     /* Enable interrupt. */
00187     if (enabled) {
00188         sbi(EIMSK, INT7);
00189     }
00190     return rc;
00191 }
00192 
00196 #ifdef __IMAGECRAFT__
00197 #pragma interrupt_handler SIG_INTERRUPT7:iv_INT7
00198 #endif
00199 NUTSIGNAL(SIG_INTERRUPT7, sig_INTERRUPT7)
00200 
00201 
00202 

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