arch/m68k/sun3/sun3ints.c

   1  /*
   2  * linux/arch/m68k/sun3/sun3ints.c -- Sun-3(x) 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/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel_stat.h>
  13 #include <linux/interrupt.h>
  14 #include <asm/intersil.h>
  15 #include <asm/oplib.h>
  16 #include <asm/sun3ints.h>
  17 #include <asm/irq_regs.h>
  18 #include <linux/seq_file.h>
  19
  20 #include "sun3.h"
  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 static unsigned char led_pattern[8] = {
  33         (u8)~(0x80), (u8)~(0x01),
  34         (u8)~(0x40), (u8)~(0x02),
  35         (u8)~(0x20), (u8)~(0x04),
  36         (u8)~(0x10), (u8)~(0x08)
  37 };
  38
  39 volatile unsigned char* sun3_intreg;
  40
  41 void sun3_enable_irq(unsigned int irq)
  42 {
  43         *sun3_intreg |=  (1 << irq);
  44 }
  45
  46 void sun3_disable_irq(unsigned int irq)
  47 {
  48         *sun3_intreg &= ~(1 << irq);
  49 }
  50
  51 static irqreturn_t sun3_int7(int irq, void *dev_id)
  52 {
  53         unsigned int cnt;
  54
  55         cnt = kstat_irqs_cpu(irq, 0);
  56         if (!(cnt % 2000))
  57                 sun3_leds(led_pattern[cnt % 16000 / 2000]);
  58         return IRQ_HANDLED;
  59 }
  60
  61 static irqreturn_t sun3_int5(int irq, void *dev_id)
  62 {
  63         unsigned long flags;
  64         unsigned int cnt;
  65
  66         local_irq_save(flags);
  67 #ifdef CONFIG_SUN3
  68         intersil_clear();
  69 #endif
  70         sun3_disable_irq(5);
  71         sun3_enable_irq(5);
  72 #ifdef CONFIG_SUN3
  73         intersil_clear();
  74 #endif
  75         legacy_timer_tick(1);
  76         cnt = kstat_irqs_cpu(irq, 0);
  77         if (!(cnt % 20))
  78                 sun3_leds(led_pattern[cnt % 160 / 20]);
  79         local_irq_restore(flags);
  80         return IRQ_HANDLED;
  81 }
  82
  83 static irqreturn_t sun3_vec255(int irq, void *dev_id)
  84 {
  85         return IRQ_HANDLED;
  86 }
  87
  88 void __init sun3_init_IRQ(void)
  89 {
  90         *sun3_intreg = 1;
  91
  92         m68k_setup_user_interrupt(VEC_USER, 128);
  93
  94         if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "clock", NULL))
  95                 pr_err("Couldn't register %s interrupt\n", "int5");
  96         if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "nmi", NULL))
  97                 pr_err("Couldn't register %s interrupt\n", "int7");
  98         if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
  99                 pr_err("Couldn't register %s interrupt\n", "vec255");
 100 }