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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29.  
  30. #include <arch/asm.h>
  31. #include <arch/drivers/pic.h>
  32. #include <byteorder.h>
  33. #include <bitops.h>
  34.  
  35. static volatile __u32 *pic;
  36.  
  37. void pic_init(void)
  38. {
  39.     pic = (__u32 *)hw_map(PIC_HW_ADDR, PAGE_SIZE);
  40. }
  41.  
  42.  
  43.  
  44. void pic_enable_interrupt(int intnum)
  45. {
  46.     if (intnum < 32) {
  47.         pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] | (1 << intnum);
  48.     } else {
  49.         pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] | (1 << (intnum - 32));
  50.     }
  51.    
  52. }
  53.  
  54. void pic_disable_interrupt(int intnum)
  55. {
  56.     if (intnum < 32) {
  57.         pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] & (~(1 << intnum));
  58.     } else {
  59.         pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] & (~(1 << (intnum - 32)));
  60.     }
  61. }
  62.  
  63. void pic_ack_interrupt(int intnum)
  64. {
  65.     if (intnum < 32)
  66.         pic[PIC_ACK_LOW] = 1 << intnum;
  67.     else
  68.         pic[PIC_ACK_HIGH] = 1 << (intnum - 32);
  69. }
  70.  
  71. /** Return number of pending interrupt */
  72. int pic_get_pending(void)
  73. {
  74.     int pending;
  75.  
  76.     pending = pic[PIC_PENDING_LOW];
  77.     if (pending) {
  78.         return fnzb32(pending);
  79.     }
  80.     pending = pic[PIC_PENDING_HIGH];
  81.     if (pending) {
  82.         return fnzb32(pending) + 32;
  83.     }
  84.     return -1;
  85. }
  86.