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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. /** @addtogroup ppc32  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35.  
  36. #include <arch/asm.h>
  37. #include <arch/drivers/pic.h>
  38. #include <byteorder.h>
  39. #include <bitops.h>
  40.  
  41. static volatile uint32_t *pic;
  42.  
  43. void pic_init(uintptr_t base, size_t size)
  44. {
  45.     pic = (uint32_t *) hw_map(base, size);
  46. }
  47.  
  48. void pic_enable_interrupt(int intnum)
  49. {
  50.     if (intnum < 32) {
  51.         pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] | (1 << intnum);
  52.     } else {
  53.         pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] | (1 << (intnum - 32));
  54.     }
  55.    
  56. }
  57.  
  58. void pic_disable_interrupt(int intnum)
  59. {
  60.     if (intnum < 32) {
  61.         pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] & (~(1 << intnum));
  62.     } else {
  63.         pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] & (~(1 << (intnum - 32)));
  64.     }
  65. }
  66.  
  67. void pic_ack_interrupt(int intnum)
  68. {
  69.     if (intnum < 32)
  70.         pic[PIC_ACK_LOW] = 1 << intnum;
  71.     else
  72.         pic[PIC_ACK_HIGH] = 1 << (intnum - 32);
  73. }
  74.  
  75. /** Return number of pending interrupt */
  76. int pic_get_pending(void)
  77. {
  78.     int pending;
  79.  
  80.     pending = pic[PIC_PENDING_LOW];
  81.     if (pending)
  82.         return fnzb32(pending);
  83.    
  84.     pending = pic[PIC_PENDING_HIGH];
  85.     if (pending)
  86.         return fnzb32(pending) + 32;
  87.    
  88.     return -1;
  89. }
  90.  
  91. /** @}
  92.  */
  93.