2 * arch/ppc/kernel/irq.c
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).
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
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.
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>
52 #include <asm/uaccess.h>
53 #include <asm/system.h>
55 #include <asm/pgtable.h>
57 #include <asm/cache.h>
59 #include <asm/ptrace.h>
61 #define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
63 extern atomic_t ipi_recv;
64 extern atomic_t ipi_sent;
66 #define MAXCOUNT 10000000
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;
75 extern int tau_initialized;
76 extern int tau_interrupts(int);
79 int show_interrupts(struct seq_file *p, void *v)
81 int i = *(loff_t *) v, j;
82 struct irqaction * action;
87 for (j=0; j<NR_CPUS; j++)
89 seq_printf(p, "CPU%d ", j);
94 spin_lock_irqsave(&irq_desc[i].lock, flags);
95 action = irq_desc[i].action;
96 if ( !action || !action->handler )
98 seq_printf(p, "%3d: ", i);
100 for (j = 0; j < NR_CPUS; j++)
102 seq_printf(p, "%10u ",
103 kstat_cpu(j).irqs[i]);
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);
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);
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++)
124 seq_printf(p, "%10u ", tau_interrupts(j));
125 seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
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));
133 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
138 void do_IRQ(struct pt_regs *regs)
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
151 while ((irq = ppc_md.get_irq(regs)) >= 0) {
155 if (irq != -2 && first)
156 /* That's not SMP safe ... but who cares ? */
157 ppc_spurious_interrupts++;
161 void __init init_IRQ(void)