i386/linux/linux-2.3.21/arch/m68k/mvme16x/16xints.c

   1 /*
   2  * arch/m68k/mvme16x/16xints.c
   3  *
   4  * Copyright (C) 1995 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
  18 #include <asm/system.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/irq.h>
  21
  22 static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp);
  23
  24 /*
  25  * This should ideally be 4 elements only, for speed.
  26  */
  27
  28 static struct {
  29         void            (*handler)(int, void *, struct pt_regs *);
  30         unsigned long   flags;
  31         void            *dev_id;
  32         const char      *devname;
  33         unsigned        count;
  34 } irq_tab[192];
  35
  36 /*
  37  * void mvme16x_init_IRQ (void)
  38  *
  39  * Parameters:  None
  40  *
  41  * Returns:     Nothing
  42  *
  43  * This function is called during kernel startup to initialize
  44  * the mvme16x IRQ handling routines.  Should probably ensure
  45  * that the base vectors for the VMEChip2 and PCCChip2 are valid.
  46  */
  47
  48 void mvme16x_init_IRQ (void)
  49 {
  50         int i;
  51
  52         for (i = 0; i < 192; i++) {
  53                 irq_tab[i].handler = mvme16x_defhand;
  54                 irq_tab[i].flags = IRQ_FLG_STD;
  55                 irq_tab[i].dev_id = NULL;
  56                 irq_tab[i].devname = NULL;
  57                 irq_tab[i].count = 0;
  58         }
  59 }
  60
  61 int mvme16x_request_irq(unsigned int irq,
  62                 void (*handler)(int, void *, struct pt_regs *),
  63                 unsigned long flags, const char *devname, void *dev_id)
  64 {
  65         if (irq < 64 || irq > 255) {
  66                 printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
  67                 return -ENXIO;
  68         }
  69
  70         if (!(irq_tab[irq-64].flags & IRQ_FLG_STD)) {
  71                 if (irq_tab[irq-64].flags & IRQ_FLG_LOCK) {
  72                         printk("%s: IRQ %d from %s is not replaceable\n",
  73                                __FUNCTION__, irq, irq_tab[irq-64].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-64].devname);
  79                         return -EBUSY;
  80                 }
  81         }
  82         irq_tab[irq-64].handler = handler;
  83         irq_tab[irq-64].flags   = flags;
  84         irq_tab[irq-64].dev_id  = dev_id;
  85         irq_tab[irq-64].devname = devname;
  86         return 0;
  87 }
  88
  89 void mvme16x_free_irq(unsigned int irq, void *dev_id)
  90 {
  91         if (irq < 64 || irq > 255) {
  92                 printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
  93                 return;
  94         }
  95
  96         if (irq_tab[irq-64].dev_id != dev_id)
  97                 printk("%s: Removing probably wrong IRQ %d from %s\n",
  98                        __FUNCTION__, irq, irq_tab[irq-64].devname);
  99
 100         irq_tab[irq-64].handler = mvme16x_defhand;;
 101         irq_tab[irq-64].flags   = IRQ_FLG_STD;
 102         irq_tab[irq-64].dev_id  = NULL;
 103         irq_tab[irq-64].devname = NULL;
 104 }
 105
 106 void mvme16x_process_int (unsigned long vec, struct pt_regs *fp)
 107 {
 108         if (vec < 64 || vec > 255)
 109                 printk ("mvme16x_process_int: Illegal vector %ld", vec);
 110         else
 111         {
 112                 irq_tab[vec-64].count++;
 113                 irq_tab[vec-64].handler(vec, irq_tab[vec-64].dev_id, fp);
 114         }
 115 }
 116
 117 int mvme16x_get_irq_list (char *buf)
 118 {
 119         int i, len = 0;
 120
 121         for (i = 0; i < 192; i++) {
 122                 if (irq_tab[i].count)
 123                         len += sprintf (buf+len, "Vec 0x%02x: %8d  %s\n",
 124                             i+64, irq_tab[i].count,
 125                             irq_tab[i].devname ? irq_tab[i].devname : "free");
 126         }
 127         return len;
 128 }
 129
 130
 131 static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp)
 132 {
 133         printk ("Unknown interrupt 0x%02x\n", irq);
 134 }
 135
 136
 137 void mvme16x_enable_irq (unsigned int irq)
 138 {
 139 }
 140
 141
 142 void mvme16x_disable_irq (unsigned int irq)
 143 {
 144 }
 145
 146