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hd6446xintc.c revision 1.2 
      1 /*	$NetBSD: hd6446xintc.c,v 1.2 2003/07/15 02:29:38 lukem 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/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: hd6446xintc.c,v 1.2 2003/07/15 02:29:38 lukem Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 
     45 #include <sh3/devreg.h>
     46 #include <hpcsh/dev/hd6446x/hd6446xintcvar.h>
     47 #include <hpcsh/dev/hd6446x/hd6446xintcreg.h>
     48 
     49 struct hd6446x_intrhand hd6446x_intrhand[_HD6446X_INTR_N];
     50 u_int16_t hd6446x_imask[_IPL_N];
     51 u_int16_t hd6446x_ienable;
     52 void hd6446x_intr_priority_update(void);
     53 
     54 void
     55 hd6446x_intr_init()
     56 {
     57 
     58 	/* Initialize interrupt priority masks. */
     59 	hd6446x_intr_priority_update();
     60 }
     61 
     62 void *
     63 hd6446x_intr_establish(int irq, int mode, int level,
     64     int (*func)(void *), void *arg)
     65 {
     66 	struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
     67 	u_int16_t r;
     68 	int s;
     69 
     70 	s = splhigh();
     71 
     72 	/* Register interrupt handler */
     73 	hh->hh_func = func;
     74 	hh->hh_arg = arg;
     75 	hh->hh_ipl = level << 4;
     76 	hh->hh_imask = irq;
     77 	hd6446x_ienable |= hh->hh_imask;
     78 
     79 	/* Update interrupt priority masks. */
     80 	hd6446x_intr_priority_update();
     81 
     82 	/* Enable interrupt */
     83 	r = _reg_read_2(HD6446X_NIMR);
     84 	r &= ~hh->hh_imask;
     85 	_reg_write_2(HD6446X_NIMR, r);
     86 
     87 	splx(s);
     88 
     89 	return (hh);
     90 }
     91 
     92 void
     93 hd6446x_intr_disestablish(void *handle)
     94 {
     95 	struct hd6446x_intrhand *hh = handle;
     96 	u_int16_t r;
     97 	int s;
     98 
     99 	s = splhigh();
    100 
    101 	/* Disable interrupt */
    102 	r = _reg_read_2(HD6446X_NIMR);
    103 	r |= hh->hh_imask;
    104 	_reg_write_2(HD6446X_NIMR, r);
    105 
    106 	/* Update interrupt priority masks */
    107 	hd6446x_ienable &= ~hh->hh_imask;
    108 	memset(hh, 0, sizeof(*hh));
    109 	hd6446x_intr_priority_update();
    110 
    111 	splx(s);
    112 }
    113 
    114 void
    115 hd6446x_intr_priority(int irq, int level)
    116 {
    117 	struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
    118 	int s;
    119 
    120 	KDASSERT(hh->hh_func != NULL);
    121 	s = splhigh();
    122 	hh->hh_ipl = level << 4;
    123 	hd6446x_intr_priority_update();
    124 	splx(s);
    125 }
    126 
    127 void
    128 hd6446x_intr_priority_update()
    129 {
    130 	struct hd6446x_intrhand *hh;
    131 	int irq, ipl;
    132 	u_int16_t mask;
    133 
    134 	/* I assume interrupt level is splhigh */
    135 	for (ipl = 0; ipl < _IPL_N; ipl++) {
    136 		hh = hd6446x_intrhand;
    137 		mask = 0;
    138 		for (irq = 0; irq < _HD6446X_INTR_N; irq++, hh++) {
    139 			if (hh->hh_func == NULL)
    140 				continue;
    141 			if (hh->hh_ipl == (ipl << 4))
    142 				mask |= 1 << irq;
    143 		}
    144 		hd6446x_imask[ipl] = mask | ~hd6446x_ienable;
    145 	}
    146 
    147 	for (ipl = 1; ipl < _IPL_N; ipl++)
    148 		hd6446x_imask[ipl] |= hd6446x_imask[ipl - 1];
    149 }
    150