LXR linux/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
  20extern void sun3_leds (unsigned char);
  21
  22void sun3_disable_interrupts(void)
  23{
  24        sun3_disable_irq(0);
  25}
  26
  27void sun3_enable_interrupts(void)
  28{
  29        sun3_enable_irq(0);
  30}
  31
  32static int led_pattern[8] = {
  33       ~(0x80), ~(0x01),
  34       ~(0x40), ~(0x02),
  35       ~(0x20), ~(0x04),
  36       ~(0x10), ~(0x08)
  37};
  38
  39volatile unsigned char* sun3_intreg;
  40
  41void sun3_enable_irq(unsigned int irq)
  42{
  43        *sun3_intreg |=  (1 << irq);
  44}
  45
  46void sun3_disable_irq(unsigned int irq)
  47{
  48        *sun3_intreg &= ~(1 << irq);
  49}
  50
  51static 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
  61static 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
  83static irqreturn_t sun3_vec255(int irq, void *dev_id)
  84{
  85        return IRQ_HANDLED;
  86}
  87
  88void __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}
 101