arch/ppc/kernel/irq.c

   1 /*
   2  *  arch/ppc/kernel/irq.c
   3  *
   4  *  Derived from arch/i386/kernel/irq.c
   5  *    Copyright (C) 1992 Linus Torvalds
   6  *  Adapted from arch/i386 by Gary Thomas
   7  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   8  *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
   9  *    Copyright (C) 1996-2001 Cort Dougan
  10  *  Adapted for Power Macintosh by Paul Mackerras
  11  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
  12  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
  13  *
  14  * This file contains the code used by various IRQ handling routines:
  15  * asking for different IRQ's should be done through these routines
  16  * instead of just grabbing them. Thus setups with different IRQ numbers
  17  * shouldn't result in any weird surprises, and installing new handlers
  18  * should be easier.
  19  *
  20  * The MPC8xx has an interrupt mask in the SIU.  If a bit is set, the
  21  * interrupt is _enabled_.  As expected, IRQ0 is bit 0 in the 32-bit
  22  * mask register (of which only 16 are defined), hence the weird shifting
  23  * and complement of the cached_irq_mask.  I want to be able to stuff
  24  * this right into the SIU SMASK register.
  25  * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
  26  * to reduce code space and undefined function references.
  27  */
  28
  29 #include <linux/errno.h>
  30 #include <linux/module.h>
  31 #include <linux/threads.h>
  32 #include <linux/kernel_stat.h>
  33 #include <linux/signal.h>
  34 #include <linux/sched.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/ioport.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/timex.h>
  39 #include <linux/config.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/pci.h>
  43 #include <linux/delay.h>
  44 #include <linux/irq.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/random.h>
  47 #include <linux/seq_file.h>
  48 #include <linux/cpumask.h>
  49 #include <linux/profile.h>
  50 #include <linux/bitops.h>
  51
  52 #include <asm/uaccess.h>
  53 #include <asm/system.h>
  54 #include <asm/io.h>
  55 #include <asm/pgtable.h>
  56 #include <asm/irq.h>
  57 #include <asm/cache.h>
  58 #include <asm/prom.h>
  59 #include <asm/ptrace.h>
  60
  61 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
  62
  63 extern atomic_t ipi_recv;
  64 extern atomic_t ipi_sent;
  65
  66 #define MAXCOUNT 10000000
  67
  68 int ppc_spurious_interrupts = 0;
  69 struct irqaction *ppc_irq_action[NR_IRQS];
  70 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
  71 unsigned long ppc_lost_interrupts[NR_MASK_WORDS];
  72 atomic_t ppc_n_lost_interrupts;
  73
  74 #ifdef CONFIG_TAU_INT
  75 extern int tau_initialized;
  76 extern int tau_interrupts(int);
  77 #endif
  78
  79 int show_interrupts(struct seq_file *p, void *v)
  80 {
  81         int i = *(loff_t *) v, j;
  82         struct irqaction * action;
  83         unsigned long flags;
  84
  85         if (i == 0) {
  86                 seq_puts(p, "           ");
  87                 for (j=0; j<NR_CPUS; j++)
  88                         if (cpu_online(j))
  89                                 seq_printf(p, "CPU%d       ", j);
  90                 seq_putc(p, '\n');
  91         }
  92
  93         if (i < NR_IRQS) {
  94                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  95                 action = irq_desc[i].action;
  96                 if ( !action || !action->handler )
  97                         goto skip;
  98                 seq_printf(p, "%3d: ", i);
  99 #ifdef CONFIG_SMP
 100                 for (j = 0; j < NR_CPUS; j++)
 101                         if (cpu_online(j))
 102                                 seq_printf(p, "%10u ",
 103                                            kstat_cpu(j).irqs[i]);
 104 #else
 105                 seq_printf(p, "%10u ", kstat_irqs(i));
 106 #endif /* CONFIG_SMP */
 107                 if (irq_desc[i].handler)
 108                         seq_printf(p, " %s ", irq_desc[i].handler->typename);
 109                 else
 110                         seq_puts(p, "  None      ");
 111                 seq_printf(p, "%s", (irq_desc[i].status & IRQ_LEVEL) ? "Level " : "Edge  ");
 112                 seq_printf(p, "    %s", action->name);
 113                 for (action = action->next; action; action = action->next)
 114                         seq_printf(p, ", %s", action->name);
 115                 seq_putc(p, '\n');
 116 skip:
 117                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 118         } else if (i == NR_IRQS) {
 119 #ifdef CONFIG_TAU_INT
 120                 if (tau_initialized){
 121                         seq_puts(p, "TAU: ");
 122                         for (j = 0; j < NR_CPUS; j++)
 123                                 if (cpu_online(j))
 124                                         seq_printf(p, "%10u ", tau_interrupts(j));
 125                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
 126                 }
 127 #endif
 128 #ifdef CONFIG_SMP
 129                 /* should this be per processor send/receive? */
 130                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
 131                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
 132 #endif
 133                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
 134         }
 135         return 0;
 136 }
 137
 138 void do_IRQ(struct pt_regs *regs)
 139 {
 140         int irq, first = 1;
 141         irq_enter();
 142
 143         /*
 144          * Every platform is required to implement ppc_md.get_irq.
 145          * This function will either return an irq number or -1 to
 146          * indicate there are no more pending.  But the first time
 147          * through the loop this means there wasn't and IRQ pending.
 148          * The value -2 is for buggy hardware and means that this IRQ
 149          * has already been handled. -- Tom
 150          */
 151         while ((irq = ppc_md.get_irq(regs)) >= 0) {
 152                 __do_IRQ(irq, regs);
 153                 first = 0;
 154         }
 155         if (irq != -2 && first)
 156                 /* That's not SMP safe ... but who cares ? */
 157                 ppc_spurious_interrupts++;
 158         irq_exit();
 159 }
 160
 161 void __init init_IRQ(void)
 162 {
 163         ppc_md.init_IRQ();
 164 }