sys/arch/hpcsh/dev/hd6446x/hd6446xintc.c

   1 /*      $NetBSD: hd6446xintc.c,v 1.7 2006/07/22 02:13:06 uwe 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: hd6446xintc.c,v 1.7 2006/07/22 02:13:06 uwe Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37
  38 #include <sh3/devreg.h>
  39 #include <hpcsh/dev/hd6446x/hd6446xintcreg.h>
  40 #include <hpcsh/dev/hd6446x/hd6446xintcvar.h>
  41
  42 struct hd6446x_intrhand hd6446x_intrhand[_HD6446X_INTR_N];
  43 uint16_t hd6446x_imask[_IPL_N];
  44 uint16_t hd6446x_ienable;
  45
  46 static void hd6446x_intr_priority_update(void);
  47
  48
  49 void
  50 hd6446x_intr_init(void)
  51 {
  52
  53         /* Initialize interrupt priority masks. */
  54         hd6446x_intr_priority_update();
  55 }
  56
  57 void *
  58 hd6446x_intr_establish(int irq, int mode, int level,
  59     int (*func)(void *), void *arg)
  60 {
  61         struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
  62         int s;
  63
  64         s = splhigh();
  65
  66         /* Register interrupt handler */
  67         hh->hh_func = func;
  68         hh->hh_arg = arg;
  69         hh->hh_ipl = level << 4;
  70         hh->hh_imask = irq;
  71         hd6446x_ienable |= hh->hh_imask;
  72
  73         /* Update interrupt priority masks. */
  74         hd6446x_intr_priority_update();
  75
  76         splx(s);
  77
  78         return (hh);
  79 }
  80
  81 void
  82 hd6446x_intr_disestablish(void *handle)
  83 {
  84         struct hd6446x_intrhand *hh = handle;
  85         int s;
  86
  87         s = splhigh();
  88
  89         /* Update interrupt priority masks */
  90         hd6446x_ienable &= ~hh->hh_imask;
  91         memset(hh, 0, sizeof(*hh));
  92         hd6446x_intr_priority_update();
  93
  94         splx(s);
  95 }
  96
  97 void
  98 hd6446x_intr_priority(int irq, int level)
  99 {
 100         struct hd6446x_intrhand *hh = &hd6446x_intrhand[ffs(irq) - 1];
 101         int s;
 102
 103         KDASSERT(hh->hh_func != NULL);
 104         s = splhigh();
 105         hh->hh_ipl = level << 4;
 106         hd6446x_intr_priority_update();
 107         splx(s);
 108 }
 109
 110 static void
 111 hd6446x_intr_priority_update(void)
 112 {
 113         int ipl, src;
 114
 115         for (ipl = 0; ipl < _IPL_N; ipl++) {
 116                 uint16_t mask = ~hd6446x_ienable; /* mask disabled */
 117
 118                 /* mask sources interrupting at <= ipl */
 119                 for (src = 0; src < _HD6446X_INTR_N; ++src) {
 120                         struct hd6446x_intrhand *hh = &hd6446x_intrhand[src];
 121
 122                         if (hh->hh_func != NULL && hh->hh_ipl <= (ipl << 4))
 123                                 mask |= 1 << src;
 124                 }
 125
 126                 hd6446x_imask[ipl] = mask;
 127         }
 128 }