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/irq.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17
  18 #include <asm/irq_cpu.h>
  19 #include <asm/mipsregs.h>
  20 #include <asm/system.h>
  21
  22 static inline void unmask_rm9k_irq(struct irq_data *d)
  23 {
  24         set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
  25 }
  26
  27 static inline void mask_rm9k_irq(struct irq_data *d)
  28 {
  29         clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
  30 }
  31
  32 static inline void rm9k_cpu_irq_enable(struct irq_data *d)
  33 {
  34         unsigned long flags;
  35
  36         local_irq_save(flags);
  37         unmask_rm9k_irq(d);
  38         local_irq_restore(flags);
  39 }
  40
  41 /*
  42  * Performance counter interrupts are global on all processors.
  43  */
  44 static void local_rm9k_perfcounter_irq_startup(void *args)
  45 {
  46         rm9k_cpu_irq_enable(args);
  47 }
  48
  49 static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
  50 {
  51         on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
  52
  53         return 0;
  54 }
  55
  56 static void local_rm9k_perfcounter_irq_shutdown(void *args)
  57 {
  58         unsigned long flags;
  59
  60         local_irq_save(flags);
  61         mask_rm9k_irq(args);
  62         local_irq_restore(flags);
  63 }
  64
  65 static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
  66 {
  67         on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
  68 }
  69
  70 static struct irq_chip rm9k_irq_controller = {
  71         .name = "RM9000",
  72         .irq_ack = mask_rm9k_irq,
  73         .irq_mask = mask_rm9k_irq,
  74         .irq_mask_ack = mask_rm9k_irq,
  75         .irq_unmask = unmask_rm9k_irq,
  76         .irq_eoi = unmask_rm9k_irq
  77 };
  78
  79 static struct irq_chip rm9k_perfcounter_irq = {
  80         .name = "RM9000",
  81         .irq_startup = rm9k_perfcounter_irq_startup,
  82         .irq_shutdown = rm9k_perfcounter_irq_shutdown,
  83         .irq_ack = mask_rm9k_irq,
  84         .irq_mask = mask_rm9k_irq,
  85         .irq_mask_ack = mask_rm9k_irq,
  86         .irq_unmask = unmask_rm9k_irq,
  87 };
  88
  89 unsigned int rm9000_perfcount_irq;
  90
  91 EXPORT_SYMBOL(rm9000_perfcount_irq);
  92
  93 void __init rm9k_cpu_irq_init(void)
  94 {
  95         int base = RM9K_CPU_IRQ_BASE;
  96         int i;
  97
  98         clear_c0_intcontrol(0x0000f000);                /* Mask all */
  99
 100         for (i = base; i < base + 4; i++)
 101                 irq_set_chip_and_handler(i, &rm9k_irq_controller,
 102                                          handle_level_irq);
 103
 104         rm9000_perfcount_irq = base + 1;
 105         irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
 106                                  handle_percpu_irq);
 107 }