arch/mips/kernel/irq-rm9000.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 RM9000 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 #include <linux/module.h>
  16
  17 #include <asm/irq_cpu.h>
  18 #include <asm/mipsregs.h>
  19 #include <asm/system.h>
  20
  21 static int irq_base;
  22
  23 static inline void unmask_rm9k_irq(unsigned int irq)
  24 {
  25         set_c0_intcontrol(0x1000 << (irq - irq_base));
  26 }
  27
  28 static inline void mask_rm9k_irq(unsigned int irq)
  29 {
  30         clear_c0_intcontrol(0x1000 << (irq - irq_base));
  31 }
  32
  33 static inline void rm9k_cpu_irq_enable(unsigned int irq)
  34 {
  35         unsigned long flags;
  36
  37         local_irq_save(flags);
  38         unmask_rm9k_irq(irq);
  39         local_irq_restore(flags);
  40 }
  41
  42 static void rm9k_cpu_irq_disable(unsigned int irq)
  43 {
  44         unsigned long flags;
  45
  46         local_irq_save(flags);
  47         mask_rm9k_irq(irq);
  48         local_irq_restore(flags);
  49 }
  50
  51 /*
  52  * Performance counter interrupts are global on all processors.
  53  */
  54 static void local_rm9k_perfcounter_irq_startup(void *args)
  55 {
  56         unsigned int irq = (unsigned int) args;
  57
  58         rm9k_cpu_irq_enable(irq);
  59 }
  60
  61 static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
  62 {
  63         on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);
  64
  65         return 0;
  66 }
  67
  68 static void local_rm9k_perfcounter_irq_shutdown(void *args)
  69 {
  70         unsigned int irq = (unsigned int) args;
  71         unsigned long flags;
  72
  73         local_irq_save(flags);
  74         mask_rm9k_irq(irq);
  75         local_irq_restore(flags);
  76 }
  77
  78 static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
  79 {
  80         on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
  81 }
  82
  83 static struct irq_chip rm9k_irq_controller = {
  84         .typename = "RM9000",
  85         .ack = mask_rm9k_irq,
  86         .mask = mask_rm9k_irq,
  87         .mask_ack = mask_rm9k_irq,
  88         .unmask = unmask_rm9k_irq,
  89 };
  90
  91 static struct irq_chip rm9k_perfcounter_irq = {
  92         .typename = "RM9000",
  93         .startup = rm9k_perfcounter_irq_startup,
  94         .shutdown = rm9k_perfcounter_irq_shutdown,
  95         .ack = mask_rm9k_irq,
  96         .mask = mask_rm9k_irq,
  97         .mask_ack = mask_rm9k_irq,
  98         .unmask = unmask_rm9k_irq,
  99 };
 100
 101 unsigned int rm9000_perfcount_irq;
 102
 103 EXPORT_SYMBOL(rm9000_perfcount_irq);
 104
 105 void __init rm9k_cpu_irq_init(int base)
 106 {
 107         int i;
 108
 109         clear_c0_intcontrol(0x0000f000);                /* Mask all */
 110
 111         for (i = base; i < base + 4; i++)
 112                 set_irq_chip_and_handler(i, &rm9k_irq_controller,
 113                                          handle_level_irq);
 114
 115         rm9000_perfcount_irq = base + 1;
 116         set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
 117                                  handle_level_irq);
 118
 119         irq_base = base;
 120 }