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   1 /*
   2  * arch/v850/kernel/irq.c -- High-level interrupt handling
   3  *
   4  *  Copyright (C) 2001,02,03,04,05  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03,04,05  Miles Bader <miles@gnu.org>
   6  *  Copyright (C) 1994-2000  Ralf Baechle
   7  *  Copyright (C) 1992  Linus Torvalds
   8  *
   9  * This file is subject to the terms and conditions of the GNU General
  10  * Public License.  See the file COPYING in the main directory of this
  11  * archive for more details.
  12  *
  13  * This file was was derived from the mips version, arch/mips/kernel/irq.c
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/irq.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel_stat.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/random.h>
  25 #include <linux/seq_file.h>
  26
  27 #include <asm/system.h>
  28
  29 /*
  30  * 'what should we do if we get a hw irq event on an illegal vector'.
  31  * each architecture has to answer this themselves, it doesn't deserve
  32  * a generic callback i think.
  33  */
  34 void ack_bad_irq(unsigned int irq)
  35 {
  36         printk("received IRQ %d with unknown interrupt type\n", irq);
  37 }
  38
  39 volatile unsigned long irq_err_count, spurious_count;
  40
  41 /*
  42  * Generic, controller-independent functions:
  43  */
  44
  45 int show_interrupts(struct seq_file *p, void *v)
  46 {
  47         int irq = *(loff_t *) v;
  48
  49         if (irq == 0) {
  50                 int cpu;
  51                 seq_puts(p, "           ");
  52                 for (cpu=0; cpu < 1 /*smp_num_cpus*/; cpu++)
  53                         seq_printf(p, "CPU%d       ", cpu);
  54                 seq_putc(p, '\n');
  55         }
  56
  57         if (irq < NR_IRQS) {
  58                 unsigned long flags;
  59                 struct irqaction *action;
  60
  61                 spin_lock_irqsave(&irq_desc[irq].lock, flags);
  62
  63                 action = irq_desc[irq].action;
  64                 if (action) {
  65                         int j;
  66                         int count = 0;
  67                         int num = -1;
  68                         const char *type_name = irq_desc[irq].handler->typename;
  69
  70                         for (j = 0; j < NR_IRQS; j++)
  71                                 if (irq_desc[j].handler->typename == type_name){
  72                                         if (irq == j)
  73                                                 num = count;
  74                                         count++;
  75                                 }
  76
  77                         seq_printf(p, "%3d: ",irq);
  78                         seq_printf(p, "%10u ", kstat_irqs(irq));
  79                         if (count > 1) {
  80                                 int prec = (num >= 100 ? 3 : num >= 10 ? 2 : 1);
  81                                 seq_printf(p, " %*s%d", 14 - prec,
  82                                            type_name, num);
  83                         } else
  84                                 seq_printf(p, " %14s", type_name);
  85
  86                         seq_printf(p, "  %s", action->name);
  87                         for (action=action->next; action; action = action->next)
  88                                 seq_printf(p, ", %s", action->name);
  89                         seq_putc(p, '\n');
  90                 }
  91
  92                 spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
  93         } else if (irq == NR_IRQS)
  94                 seq_printf(p, "ERR: %10lu\n", irq_err_count);
  95
  96         return 0;
  97 }
  98
  99 /* Handle interrupt IRQ.  REGS are the registers at the time of ther
 100    interrupt.  */
 101 unsigned int handle_irq (int irq, struct pt_regs *regs)
 102 {
 103         irq_enter();
 104         __do_IRQ(irq, regs);
 105         irq_exit();
 106         return 1;
 107 }
 108
 109 /* Initialize irq handling for IRQs.
 110    BASE_IRQ, BASE_IRQ+INTERVAL, ..., BASE_IRQ+NUM*INTERVAL
 111    to IRQ_TYPE.  An IRQ_TYPE of 0 means to use a generic interrupt type.  */
 112 void __init
 113 init_irq_handlers (int base_irq, int num, int interval,
 114                    struct hw_interrupt_type *irq_type)
 115 {
 116         while (num-- > 0) {
 117                 irq_desc[base_irq].status  = IRQ_DISABLED;
 118                 irq_desc[base_irq].action  = NULL;
 119                 irq_desc[base_irq].depth   = 1;
 120                 irq_desc[base_irq].handler = irq_type;
 121                 base_irq += interval;
 122         }
 123 }