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hd6446xintc.c revision 1.1.8.2 
      1 /*	$NetBSD: hd6446xintc.c,v 1.1.8.2 2002/06/23 17:37:01 jdolecek Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 
     42 #include <sh3/devreg.h>
     43 #include <hpcsh/dev/hd6446x/hd6446xintcvar.h>
     44 #include <hpcsh/dev/hd6446x/hd6446xintcreg.h>
     45 
     46 struct hd6446x_intrhand hd6446x_intrhand[_HD6446X_INTR_N];
     47 u_int16_t hd6446x_imask[_IPL_N];
     48 u_int16_t hd6446x_ienable;
     49 void hd6446x_intr_priority_update(void);
     50 
     51 void
     52 hd6446x_intr_init()
     53 {
     54 
     55 	/* Initialize interrupt priority masks. */
     56 	hd6446x_intr_priority_update();
     57 }
     58 
     59 void *
     60 hd6446x_intr_establish(int irq, int mode, int level,
     61     int (*func)(void *), void *arg)
     62 {
     63 	struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
     64 	u_int16_t r;
     65 	int s;
     66 
     67 	s = splhigh();
     68 
     69 	/* Register interrupt handler */
     70 	hh->hh_func = func;
     71 	hh->hh_arg = arg;
     72 	hh->hh_ipl = level << 4;
     73 	hh->hh_imask = irq;
     74 	hd6446x_ienable |= hh->hh_imask;
     75 
     76 	/* Update interrupt priority masks. */
     77 	hd6446x_intr_priority_update();
     78 
     79 	/* Enable interrupt */
     80 	r = _reg_read_2(HD6446X_NIMR);
     81 	r &= ~hh->hh_imask;
     82 	_reg_write_2(HD6446X_NIMR, r);
     83 
     84 	splx(s);
     85 
     86 	return (hh);
     87 }
     88 
     89 void
     90 hd6446x_intr_disestablish(void *handle)
     91 {
     92 	struct hd6446x_intrhand *hh = handle;
     93 	u_int16_t r;
     94 	int s;
     95 
     96 	s = splhigh();
     97 
     98 	/* Disable interrupt */
     99 	r = _reg_read_2(HD6446X_NIMR);
    100 	r |= hh->hh_imask;
    101 	_reg_write_2(HD6446X_NIMR, r);
    102 
    103 	/* Update interrupt priority masks */
    104 	hd6446x_ienable &= ~hh->hh_imask;
    105 	memset(hh, 0, sizeof(*hh));
    106 	hd6446x_intr_priority_update();
    107 
    108 	splx(s);
    109 }
    110 
    111 void
    112 hd6446x_intr_priority(int irq, int level)
    113 {
    114 	struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
    115 	int s;
    116 
    117 	KDASSERT(hh->hh_func != NULL);
    118 	s = splhigh();
    119 	hh->hh_ipl = level << 4;
    120 	hd6446x_intr_priority_update();
    121 	splx(s);
    122 }
    123 
    124 void
    125 hd6446x_intr_priority_update()
    126 {
    127 	struct hd6446x_intrhand *hh;
    128 	int irq, ipl;
    129 	u_int16_t mask;
    130 
    131 	/* I assume interrupt level is splhigh */
    132 	for (ipl = 0; ipl < _IPL_N; ipl++) {
    133 		hh = hd6446x_intrhand;
    134 		mask = 0;
    135 		for (irq = 0; irq < _HD6446X_INTR_N; irq++, hh++) {
    136 			if (hh->hh_func == NULL)
    137 				continue;
    138 			if (hh->hh_ipl == (ipl << 4))
    139 				mask |= 1 << irq;
    140 		}
    141 		hd6446x_imask[ipl] = mask | ~hd6446x_ienable;
    142 	}
    143 
    144 	for (ipl = 1; ipl < _IPL_N; ipl++)
    145 		hd6446x_imask[ipl] |= hd6446x_imask[ipl - 1];
    146 }
    147