linux/arch/m68k/sun3/sun3ints.c
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   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/segment.h>
  15#include <asm/intersil.h>
  16#include <asm/oplib.h>
  17#include <asm/sun3ints.h>
  18#include <asm/irq_regs.h>
  19#include <linux/seq_file.h>
  20
  21extern void sun3_leds (unsigned char);
  22
  23void sun3_disable_interrupts(void)
  24{
  25        sun3_disable_irq(0);
  26}
  27
  28void sun3_enable_interrupts(void)
  29{
  30        sun3_enable_irq(0);
  31}
  32
  33static int led_pattern[8] = {
  34       ~(0x80), ~(0x01),
  35       ~(0x40), ~(0x02),
  36       ~(0x20), ~(0x04),
  37       ~(0x10), ~(0x08)
  38};
  39
  40volatile unsigned char* sun3_intreg;
  41
  42void sun3_enable_irq(unsigned int irq)
  43{
  44        *sun3_intreg |=  (1 << irq);
  45}
  46
  47void sun3_disable_irq(unsigned int irq)
  48{
  49        *sun3_intreg &= ~(1 << irq);
  50}
  51
  52static irqreturn_t sun3_int7(int irq, void *dev_id)
  53{
  54        unsigned int cnt;
  55
  56        cnt = kstat_irqs_cpu(irq, 0);
  57        if (!(cnt % 2000))
  58                sun3_leds(led_pattern[cnt % 16000 / 2000]);
  59        return IRQ_HANDLED;
  60}
  61
  62static irqreturn_t sun3_int5(int irq, void *dev_id)
  63{
  64        unsigned long flags;
  65        unsigned int cnt;
  66
  67        local_irq_save(flags);
  68#ifdef CONFIG_SUN3
  69        intersil_clear();
  70#endif
  71        sun3_disable_irq(5);
  72        sun3_enable_irq(5);
  73#ifdef CONFIG_SUN3
  74        intersil_clear();
  75#endif
  76        legacy_timer_tick(1);
  77        cnt = kstat_irqs_cpu(irq, 0);
  78        if (!(cnt % 20))
  79                sun3_leds(led_pattern[cnt % 160 / 20]);
  80        local_irq_restore(flags);
  81        return IRQ_HANDLED;
  82}
  83
  84static irqreturn_t sun3_vec255(int irq, void *dev_id)
  85{
  86        return IRQ_HANDLED;
  87}
  88
  89void __init sun3_init_IRQ(void)
  90{
  91        *sun3_intreg = 1;
  92
  93        m68k_setup_user_interrupt(VEC_USER, 128);
  94
  95        if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "clock", NULL))
  96                pr_err("Couldn't register %s interrupt\n", "int5");
  97        if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "nmi", NULL))
  98                pr_err("Couldn't register %s interrupt\n", "int7");
  99        if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
 100                pr_err("Couldn't register %s interrupt\n", "vec255");
 101}
 102