i386/linux/linux-2.3.21/arch/m68k/sun3/sun3ints.c

   1  /*
   2  * linux/arch/m68k/sun3/sun3ints.c -- Sun-3 Linux interrupt handling code
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file COPYING in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/interrupt.h>
  15 #include <asm/segment.h>
  16 #include <asm/intersil.h>
  17 #include <asm/oplib.h>
  18 #include <asm/sun3ints.h>
  19
  20 extern void sun3_leds (unsigned char);
  21
  22 void sun3_disable_interrupts(void)
  23 {
  24         sun3_disable_irq(0);
  25 }
  26
  27 void sun3_enable_interrupts(void)
  28 {
  29         sun3_enable_irq(0);
  30 }
  31
  32 int led_pattern[8] = {
  33        ~(0x80), ~(0x01),
  34        ~(0x40), ~(0x02),
  35        ~(0x20), ~(0x04),
  36        ~(0x10), ~(0x08)
  37 };
  38
  39 unsigned char* sun3_intreg;
  40
  41 void sun3_init_IRQ(void)
  42 {
  43 }
  44
  45 void sun3_insert_irq(irq_node_t **list, irq_node_t *node)
  46 {
  47 }
  48
  49 void sun3_delete_irq(irq_node_t **list, void *dev_id)
  50 {
  51 }
  52
  53 void sun3_free_irq(unsigned int irq, void *dev_id)
  54 {
  55 }
  56
  57 void sun3_enable_irq(unsigned int irq)
  58 {
  59         *sun3_intreg |=  (1<<irq);
  60 }
  61
  62 void sun3_disable_irq(unsigned int irq)
  63 {
  64         *sun3_intreg &= ~(1<<irq);
  65 }
  66
  67 inline void sun3_do_irq(int irq, struct pt_regs *fp)
  68 {
  69         kstat.irqs[0][SYS_IRQS + irq]++;
  70         *sun3_intreg &= ~(1<<irq);
  71         *sun3_intreg |=  (1<<irq);
  72 }
  73
  74 int sun3_get_irq_list(char *buf)
  75 {
  76         return 0;
  77 }
  78
  79 static void sun3_int5(int irq, void *dev_id, struct pt_regs *fp)
  80 {
  81         kstat.irqs[0][SYS_IRQS + irq]++;
  82         *sun3_intreg &= ~(1<<irq);
  83         intersil_clear();
  84         *sun3_intreg |=  (1<<irq);
  85         do_timer(fp);
  86         if(!(kstat.irqs[0][SYS_IRQS + irq] % 20))
  87                 sun3_leds(led_pattern[(kstat.irqs[0][SYS_IRQS+irq]%160)
  88                 /20]);
  89 }
  90
  91 static void sun3_int7(int irq, void *dev_id, struct pt_regs *fp)
  92 {
  93         sun3_do_irq(irq,fp);
  94         if(!(kstat.irqs[0][SYS_IRQS + irq] % 2000))
  95                 sun3_leds(led_pattern[(kstat.irqs[0][SYS_IRQS+irq]%16000)/2000]);
  96 }
  97
  98 /* handle requested ints, excepting 5 and 7, which always do the same
  99    thing */
 100 static void *dev_ids[SYS_IRQS];
 101 static void (*inthandler[SYS_IRQS])(int, void *, struct pt_regs *) = {
 102         NULL, NULL, NULL, NULL, NULL, sun3_int5, NULL, sun3_int7
 103 };
 104
 105 static void sun3_inthandle(int irq, void *dev_id, struct pt_regs *fp)
 106 {
 107         if(inthandler[irq] == NULL)
 108                 panic ("bad interrupt %d received (id %p)\n",irq, dev_id);
 109
 110         kstat.irqs[0][SYS_IRQS + irq]++;
 111         *sun3_intreg &= ~(1<<irq);
 112
 113         inthandler[irq](irq, dev_ids[irq], fp);
 114 }
 115
 116 void (*sun3_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
 117         sun3_inthandle, sun3_inthandle, sun3_inthandle, sun3_inthandle,
 118         sun3_inthandle, sun3_int5, sun3_inthandle, sun3_int7
 119 };
 120
 121 int sun3_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
 122                       unsigned long flags, const char *devname, void *dev_id)
 123 {
 124         if(inthandler[irq] != NULL)
 125                 return -1;
 126
 127         inthandler[irq] = handler;
 128         dev_ids[irq] = dev_id;
 129
 130         return 0;
 131 }
 132