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/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
  21 extern void sun3_leds (unsigned char);
  22
  23 void sun3_disable_interrupts(void)
  24 {
  25         sun3_disable_irq(0);
  26 }
  27
  28 void sun3_enable_interrupts(void)
  29 {
  30         sun3_enable_irq(0);
  31 }
  32
  33 static int led_pattern[8] = {
  34        ~(0x80), ~(0x01),
  35        ~(0x40), ~(0x02),
  36        ~(0x20), ~(0x04),
  37        ~(0x10), ~(0x08)
  38 };
  39
  40 volatile unsigned char* sun3_intreg;
  41
  42 void sun3_enable_irq(unsigned int irq)
  43 {
  44         *sun3_intreg |=  (1 << irq);
  45 }
  46
  47 void sun3_disable_irq(unsigned int irq)
  48 {
  49         *sun3_intreg &= ~(1 << irq);
  50 }
  51
  52 static irqreturn_t sun3_int7(int irq, void *dev_id)
  53 {
  54         *sun3_intreg |=  (1 << irq);
  55         if (!(kstat_cpu(0).irqs[irq] % 2000))
  56                 sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 16000) / 2000]);
  57         return IRQ_HANDLED;
  58 }
  59
  60 static irqreturn_t sun3_int5(int irq, void *dev_id)
  61 {
  62 #ifdef CONFIG_SUN3
  63         intersil_clear();
  64 #endif
  65         *sun3_intreg |=  (1 << irq);
  66 #ifdef CONFIG_SUN3
  67         intersil_clear();
  68 #endif
  69         do_timer(1);
  70 #ifndef CONFIG_SMP
  71         update_process_times(user_mode(get_irq_regs()));
  72 #endif
  73         if (!(kstat_cpu(0).irqs[irq] % 20))
  74                 sun3_leds(led_pattern[(kstat_cpu(0).irqs[irq] % 160) / 20]);
  75         return IRQ_HANDLED;
  76 }
  77
  78 static irqreturn_t sun3_vec255(int irq, void *dev_id)
  79 {
  80 //      intersil_clear();
  81         return IRQ_HANDLED;
  82 }
  83
  84 static void sun3_inthandle(unsigned int irq, struct pt_regs *fp)
  85 {
  86         *sun3_intreg &= ~(1 << irq);
  87
  88         __m68k_handle_int(irq, fp);
  89 }
  90
  91 static struct irq_controller sun3_irq_controller = {
  92         .name           = "sun3",
  93         .lock           = __SPIN_LOCK_UNLOCKED(sun3_irq_controller.lock),
  94         .startup        = m68k_irq_startup,
  95         .shutdown       = m68k_irq_shutdown,
  96         .enable         = sun3_enable_irq,
  97         .disable        = sun3_disable_irq,
  98 };
  99
 100 void __init sun3_init_IRQ(void)
 101 {
 102         *sun3_intreg = 1;
 103
 104         m68k_setup_auto_interrupt(sun3_inthandle);
 105         m68k_setup_irq_controller(&sun3_irq_controller, IRQ_AUTO_1, 7);
 106         m68k_setup_user_interrupt(VEC_USER, 128, NULL);
 107
 108         if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "int5", NULL))
 109                 pr_err("Couldn't register %s interrupt\n", "int5");
 110         if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "int7", NULL))
 111                 pr_err("Couldn't register %s interrupt\n", "int7");
 112         if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
 113                 pr_err("Couldn't register %s interrupt\n", "vec255");
 114 }