arch/m68k/mvme147/147ints.c

   1 /*
   2  * arch/m68k/mvme147/147ints.c
   3  *
   4  * Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
   5  *
   6  * based on amiints.c -- Amiga Linux interrupt handling code
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file README.legal in the main directory of this archive
  10  * for more details.
  11  *
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/seq_file.h>
  18
  19 #include <asm/ptrace.h>
  20 #include <asm/system.h>
  21 #include <asm/irq.h>
  22 #include <asm/traps.h>
  23
  24 static irqreturn_t mvme147_defhand (int irq, void *dev_id, struct pt_regs *fp);
  25
  26 /*
  27  * This should ideally be 4 elements only, for speed.
  28  */
  29
  30 static struct {
  31         irqreturn_t     (*handler)(int, void *, struct pt_regs *);
  32         unsigned long   flags;
  33         void            *dev_id;
  34         const char      *devname;
  35         unsigned        count;
  36 } irq_tab[256];
  37
  38 /*
  39  * void mvme147_init_IRQ (void)
  40  *
  41  * Parameters:  None
  42  *
  43  * Returns:     Nothing
  44  *
  45  * This function is called during kernel startup to initialize
  46  * the mvme147 IRQ handling routines.
  47  */
  48
  49 void mvme147_init_IRQ (void)
  50 {
  51         int i;
  52
  53         for (i = 0; i < 256; i++) {
  54                 irq_tab[i].handler = mvme147_defhand;
  55                 irq_tab[i].flags = IRQ_FLG_STD;
  56                 irq_tab[i].dev_id = NULL;
  57                 irq_tab[i].devname = NULL;
  58                 irq_tab[i].count = 0;
  59         }
  60 }
  61
  62 int mvme147_request_irq(unsigned int irq,
  63                 irqreturn_t (*handler)(int, void *, struct pt_regs *),
  64                 unsigned long flags, const char *devname, void *dev_id)
  65 {
  66         if (irq > 255) {
  67                 printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
  68                 return -ENXIO;
  69         }
  70         if (!(irq_tab[irq].flags & IRQ_FLG_STD)) {
  71                 if (irq_tab[irq].flags & IRQ_FLG_LOCK) {
  72                         printk("%s: IRQ %d from %s is not replaceable\n",
  73                                __FUNCTION__, irq, irq_tab[irq].devname);
  74                         return -EBUSY;
  75                 }
  76                 if (flags & IRQ_FLG_REPLACE) {
  77                         printk("%s: %s can't replace IRQ %d from %s\n",
  78                                __FUNCTION__, devname, irq, irq_tab[irq].devname);
  79                         return -EBUSY;
  80                 }
  81         }
  82         irq_tab[irq].handler = handler;
  83         irq_tab[irq].flags   = flags;
  84         irq_tab[irq].dev_id  = dev_id;
  85         irq_tab[irq].devname = devname;
  86         return 0;
  87 }
  88
  89 void mvme147_free_irq(unsigned int irq, void *dev_id)
  90 {
  91         if (irq > 255) {
  92                 printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
  93                 return;
  94         }
  95         if (irq_tab[irq].dev_id != dev_id)
  96                 printk("%s: Removing probably wrong IRQ %d from %s\n",
  97                        __FUNCTION__, irq, irq_tab[irq].devname);
  98
  99         irq_tab[irq].handler = mvme147_defhand;
 100         irq_tab[irq].flags   = IRQ_FLG_STD;
 101         irq_tab[irq].dev_id  = NULL;
 102         irq_tab[irq].devname = NULL;
 103 }
 104
 105 irqreturn_t mvme147_process_int (unsigned long vec, struct pt_regs *fp)
 106 {
 107         if (vec > 255) {
 108                 printk ("mvme147_process_int: Illegal vector %ld\n", vec);
 109                 return IRQ_NONE;
 110         } else {
 111                 irq_tab[vec].count++;
 112                 irq_tab[vec].handler(vec, irq_tab[vec].dev_id, fp);
 113                 return IRQ_HANDLED;
 114         }
 115 }
 116
 117 int show_mvme147_interrupts (struct seq_file *p, void *v)
 118 {
 119         int i;
 120
 121         for (i = 0; i < 256; i++) {
 122                 if (irq_tab[i].count)
 123                         seq_printf(p, "Vec 0x%02x: %8d  %s\n",
 124                             i, irq_tab[i].count,
 125                             irq_tab[i].devname ? irq_tab[i].devname : "free");
 126         }
 127         return 0;
 128 }
 129
 130
 131 static irqreturn_t mvme147_defhand (int irq, void *dev_id, struct pt_regs *fp)
 132 {
 133         printk ("Unknown interrupt 0x%02x\n", irq);
 134         return IRQ_NONE;
 135 }
 136
 137 void mvme147_enable_irq (unsigned int irq)
 138 {
 139 }
 140
 141
 142 void mvme147_disable_irq (unsigned int irq)
 143 {
 144 }
 145