sys/arch/powerpc/pic/pic_prepivr.c

   1 /* $NetBSD: pic_prepivr.c,v 1.3 2007/12/11 18:04:20 garbled Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Tim Rightnour
   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: pic_prepivr.c,v 1.3 2007/12/11 18:04:20 garbled Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/malloc.h>
  37 #include <sys/kernel.h>
  38
  39 #include <uvm/uvm_extern.h>
  40
  41 #include <machine/pio.h>
  42 #include <machine/intr.h>
  43
  44 #include <arch/powerpc/pic/picvar.h>
  45
  46 #include <dev/isa/isareg.h>
  47 #include <dev/isa/isavar.h>
  48
  49 static int  prepivr_get_irq(struct pic_ops *, int);
  50 static int  motivr_get_irq(struct pic_ops *, int);
  51 static void prepivr_establish_irq(struct pic_ops *, int, int, int);
  52
  53 vaddr_t prep_intr_reg;          /* PReP interrupt vector register */
  54 uint32_t prep_intr_reg_off;     /* IVR offset within the mapped page */
  55
  56 #define IO_ELCR1        0x4d0
  57 #define IO_ELCR2        0x4d1
  58
  59 /*
  60  * Prior to calling init_prepivr, the port is expected to have mapped the
  61  * page containing the IVR with mapiodev to prep_intr_reg and set up the
  62  * prep_intr_reg_off.
  63  */
  64
  65 struct pic_ops *
  66 setup_prepivr(int ivrtype)
  67 {
  68         struct i8259_ops *prepivr;
  69         struct pic_ops *pic;
  70         uint32_t pivr;
  71
  72         prepivr = malloc(sizeof(struct i8259_ops), M_DEVBUF, M_NOWAIT);
  73         KASSERT(prepivr != NULL);
  74         pic = &prepivr->pic;
  75
  76         pivr = prep_intr_reg + prep_intr_reg_off;
  77         pic->pic_numintrs = 16;
  78         pic->pic_cookie = (void *)pivr;
  79         pic->pic_enable_irq = i8259_enable_irq;
  80         pic->pic_reenable_irq = i8259_enable_irq;
  81         pic->pic_disable_irq = i8259_disable_irq;
  82         if (ivrtype == PIC_IVR_MOT)
  83                 pic->pic_get_irq = motivr_get_irq;
  84         else
  85                 pic->pic_get_irq = prepivr_get_irq;
  86         pic->pic_ack_irq = i8259_ack_irq;
  87         pic->pic_establish_irq = prepivr_establish_irq;
  88         pic->pic_finish_setup = NULL;
  89         strcpy(pic->pic_name, "prepivr");
  90         pic_add(pic);
  91         prepivr->pending_events = 0;
  92         prepivr->enable_mask = 0xffffffff;
  93         prepivr->irqs = 0;
  94
  95         /* initialize the ELCR */
  96         isa_outb(IO_ELCR1, (0 >> 0) & 0xff);
  97         isa_outb(IO_ELCR2, (0 >> 8) & 0xff);
  98         i8259_initialize();
  99
 100         return pic;
 101 }
 102
 103 static void
 104 prepivr_establish_irq(struct pic_ops *pic, int irq, int type, int maxlevel)
 105 {
 106         u_int8_t elcr[2];
 107         int icu, bit;
 108
 109         icu = irq / 8;
 110         bit = irq % 8;
 111         elcr[0] = isa_inb(IO_ELCR1);
 112         elcr[1] = isa_inb(IO_ELCR2);
 113
 114         if (type == IST_LEVEL)
 115                 elcr[icu] |= 1 << bit;
 116         else
 117                 elcr[icu] &= ~(1 << bit);
 118
 119         isa_outb(IO_ELCR1, elcr[0]);
 120         isa_outb(IO_ELCR2, elcr[1]);
 121 }
 122
 123 static int
 124 motivr_get_irq(struct pic_ops *pic, int mode)
 125 {
 126         int irq;
 127
 128         irq = i8259_get_irq(pic, mode);
 129         /* read the IVR to ack it */
 130         (void)inb(pic->pic_cookie);
 131
 132         /* i8259_get_irq will return 255 by itself, so just pass it on */
 133         return irq;
 134 }
 135
 136 static int
 137 prepivr_get_irq(struct pic_ops *pic, int mode)
 138 {
 139         int irq;
 140
 141         irq = inb(pic->pic_cookie);
 142
 143         if (irq == 0 && mode == PIC_GET_IRQ)
 144                 return 255;
 145         if (irq == 7 && mode == PIC_GET_RECHECK)
 146                 return 255;
 147
 148         return irq;
 149 }