arch/mips/kernel/irq-rm7000.c

   1 /*
   2  * Copyright (C) 2003 Ralf Baechle
   3  *
   4  * This program is free software; you can redistribute  it and/or modify it
   5  * under  the terms of  the GNU General  Public License as published by the
   6  * Free Software Foundation;  either version 2 of the  License, or (at your
   7  * option) any later version.
   8  *
   9  * Handler for RM7000 extended interrupts.  These are a non-standard
  10  * feature so we handle them separately from standard interrupts.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15
  16 #include <asm/irq_cpu.h>
  17 #include <asm/mipsregs.h>
  18 #include <asm/system.h>
  19
  20 static int irq_base;
  21
  22 static inline void unmask_rm7k_irq(unsigned int irq)
  23 {
  24         set_c0_intcontrol(0x100 << (irq - irq_base));
  25 }
  26
  27 static inline void mask_rm7k_irq(unsigned int irq)
  28 {
  29         clear_c0_intcontrol(0x100 << (irq - irq_base));
  30 }
  31
  32 static struct irq_chip rm7k_irq_controller = {
  33         .typename = "RM7000",
  34         .ack = mask_rm7k_irq,
  35         .mask = mask_rm7k_irq,
  36         .mask_ack = mask_rm7k_irq,
  37         .unmask = unmask_rm7k_irq,
  38 };
  39
  40 void __init rm7k_cpu_irq_init(int base)
  41 {
  42         int i;
  43
  44         clear_c0_intcontrol(0x00000f00);                /* Mask all */
  45
  46         for (i = base; i < base + 4; i++)
  47                 set_irq_chip_and_handler(i, &rm7k_irq_controller,
  48                                          handle_level_irq);
  49
  50         irq_base = base;
  51 }