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   1 /*
   2  * include/asm-arm/arch-cl7500/irq.h
   3  *
   4  * Copyright (C) 1996 Russell King
   5  * Copyright (C) 1999, 2001 Nexus Electronics Ltd.
   6  *
   7  * Changelog:
   8  *   10-10-1996 RMK     Brought up to date with arch-sa110eval
   9  *   22-08-1998 RMK     Restructured IRQ routines
  10  *   11-08-1999 PJB     Created ARM7500 version, derived from RiscPC code
  11  */
  12
  13 #include <asm/hardware/iomd.h>
  14 #include <asm/io.h>
  15
  16 static inline int fixup_irq(unsigned int irq)
  17 {
  18         if (irq == IRQ_ISA) {
  19                 int isabits = *((volatile unsigned int *)0xe002b700);
  20                 if (isabits == 0) {
  21                         printk("Spurious ISA IRQ!\n");
  22                         return irq;
  23                 }
  24                 irq = IRQ_ISA_BASE;
  25                 while (!(isabits & 1)) {
  26                         irq++;
  27                         isabits >>= 1;
  28                 }
  29         }
  30
  31         return irq;
  32 }