include/asm-blackfin/irq.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file COPYING in the main directory of this archive
   4  * for more details.
   5  *
   6  * Changed by HuTao Apr18, 2003
   7  *
   8  * Copyright was missing when I got the code so took from MIPS arch ...MaTed---
   9  * Copyright (C) 1994 by Waldorf GMBH, written by Ralf Baechle
  10  * Copyright (C) 1995, 96, 97, 98, 99, 2000, 2001 by Ralf Baechle
  11  *
  12  * Adapted for BlackFin (ADI) by Ted Ma <mated@sympatico.ca>
  13  * Copyright (c) 2002 Arcturus Networks Inc. (www.arcturusnetworks.com)
  14  * Copyright (c) 2002 Lineo, Inc. <mattw@lineo.com>
  15  */
  16
  17 #ifndef _BFIN_IRQ_H_
  18 #define _BFIN_IRQ_H_
  19
  20 #include <asm/mach/irq.h>
  21 #include <asm/ptrace.h>
  22
  23 /*******************************************************************************
  24  *****   INTRODUCTION ***********
  25  *   On the Blackfin, the interrupt structure allows remmapping of the hardware
  26  *   levels.
  27  * - I'm going to assume that the H/W level is going to stay at the default
  28  *   settings. If someone wants to go through and abstart this out, feel free
  29  *   to mod the interrupt numbering scheme.
  30  * - I'm abstracting the interrupts so that uClinux does not know anything
  31  *   about the H/W levels. If you want to change the H/W AND keep the abstracted
  32  *   levels that uClinux sees, you should be able to do most of it here.
  33  * - I've left the "abstract" numbering sparce in case someone wants to pull the
  34  *   interrupts apart (just the TX/RX for the various devices)
  35  *******************************************************************************/
  36
  37 /* SYS_IRQS and NR_IRQS are defined in <asm/mach-bf5xx/irq.h>*/
  38
  39 /*
  40  * Machine specific interrupt sources.
  41  *
  42  * Adding an interrupt service routine for a source with this bit
  43  * set indicates a special machine specific interrupt source.
  44  * The machine specific files define these sources.
  45  *
  46  * The IRQ_MACHSPEC bit is now gone - the only thing it did was to
  47  * introduce unnecessary overhead.
  48  *
  49  * All interrupt handling is actually machine specific so it is better
  50  * to use function pointers, as used by the Sparc port, and select the
  51  * interrupt handling functions when initializing the kernel. This way
  52  * we save some unnecessary overhead at run-time.
  53  *                                                      01/11/97 - Jes
  54  */
  55
  56 extern void ack_bad_irq(unsigned int irq);
  57
  58 static __inline__ int irq_canonicalize(int irq)
  59 {
  60         return irq;
  61 }
  62
  63 /* count of spurious interrupts */
  64 /* extern volatile unsigned int num_spurious; */
  65
  66 #ifndef NO_IRQ
  67 #define NO_IRQ ((unsigned int)(-1))
  68 #endif
  69
  70 #endif                          /* _BFIN_IRQ_H_ */