diff options
Diffstat (limited to 'arch/ppc/kernel/irq.c')
| -rw-r--r-- | arch/ppc/kernel/irq.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/ppc/kernel/irq.c b/arch/ppc/kernel/irq.c new file mode 100644 index 000000000000..8843f3af230f --- /dev/null +++ b/arch/ppc/kernel/irq.c @@ -0,0 +1,164 @@ +/* + * arch/ppc/kernel/irq.c + * + * Derived from arch/i386/kernel/irq.c + * Copyright (C) 1992 Linus Torvalds + * Adapted from arch/i386 by Gary Thomas + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Updated and modified by Cort Dougan <cort@fsmlabs.com> + * Copyright (C) 1996-2001 Cort Dougan + * Adapted for Power Macintosh by Paul Mackerras + * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) + * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). + * + * This file contains the code used by various IRQ handling routines: + * asking for different IRQ's should be done through these routines + * instead of just grabbing them. Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier. + * + * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the + * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit + * mask register (of which only 16 are defined), hence the weird shifting + * and complement of the cached_irq_mask. I want to be able to stuff + * this right into the SIU SMASK register. + * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx + * to reduce code space and undefined function references. + */ + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/threads.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/config.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/proc_fs.h> +#include <linux/random.h> +#include <linux/seq_file.h> +#include <linux/cpumask.h> +#include <linux/profile.h> +#include <linux/bitops.h> + +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/io.h> +#include <asm/pgtable.h> +#include <asm/irq.h> +#include <asm/cache.h> +#include <asm/prom.h> +#include <asm/ptrace.h> + +#define NR_MASK_WORDS ((NR_IRQS + 31) / 32) + +extern atomic_t ipi_recv; +extern atomic_t ipi_sent; + +#define MAXCOUNT 10000000 + +int ppc_spurious_interrupts = 0; +struct irqaction *ppc_irq_action[NR_IRQS]; +unsigned long ppc_cached_irq_mask[NR_MASK_WORDS]; +unsigned long ppc_lost_interrupts[NR_MASK_WORDS]; +atomic_t ppc_n_lost_interrupts; + +#ifdef CONFIG_TAU_INT +extern int tau_initialized; +extern int tau_interrupts(int); +#endif + +int show_interrupts(struct seq_file *p, void *v) +{ + int i = *(loff_t *) v, j; + struct irqaction * action; + unsigned long flags; + + if (i == 0) { + seq_puts(p, " "); + for (j=0; j<NR_CPUS; j++) + if (cpu_online(j)) + seq_printf(p, "CPU%d ", j); + seq_putc(p, '\n'); + } + + if (i < NR_IRQS) { + spin_lock_irqsave(&irq_desc[i].lock, flags); + action = irq_desc[i].action; + if ( !action || !action->handler ) + goto skip; + seq_printf(p, "%3d: ", i); +#ifdef CONFIG_SMP + for (j = 0; j < NR_CPUS; j++) + if (cpu_online(j)) + seq_printf(p, "%10u ", + kstat_cpu(j).irqs[i]); +#else + seq_printf(p, "%10u ", kstat_irqs(i)); +#endif /* CONFIG_SMP */ + if (irq_desc[i].handler) + seq_printf(p, " %s ", irq_desc[i].handler->typename); + else + seq_puts(p, " None "); + seq_printf(p, "%s", (irq_desc[i].status & IRQ_LEVEL) ? "Level " : "Edge "); + seq_printf(p, " %s", action->name); + for (action = action->next; action; action = action->next) + seq_printf(p, ", %s", action->name); + seq_putc(p, '\n'); +skip: + spin_unlock_irqrestore(&irq_desc[i].lock, flags); + } else if (i == NR_IRQS) { +#ifdef CONFIG_TAU_INT + if (tau_initialized){ + seq_puts(p, "TAU: "); + for (j = 0; j < NR_CPUS; j++) + if (cpu_online(j)) + seq_printf(p, "%10u ", tau_interrupts(j)); + seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); + } +#endif +#ifdef CONFIG_SMP + /* should this be per processor send/receive? */ + seq_printf(p, "IPI (recv/sent): %10u/%u\n", + atomic_read(&ipi_recv), atomic_read(&ipi_sent)); +#endif + seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts); + } + return 0; +} + +void do_IRQ(struct pt_regs *regs) +{ + int irq, first = 1; + irq_enter(); + + /* + * Every platform is required to implement ppc_md.get_irq. + * This function will either return an irq number or -1 to + * indicate there are no more pending. But the first time + * through the loop this means there wasn't and IRQ pending. + * The value -2 is for buggy hardware and means that this IRQ + * has already been handled. -- Tom + */ + while ((irq = ppc_md.get_irq(regs)) >= 0) { + __do_IRQ(irq, regs); + first = 0; + } + if (irq != -2 && first) + /* That's not SMP safe ... but who cares ? */ + ppc_spurious_interrupts++; + irq_exit(); +} + +void __init init_IRQ(void) +{ + ppc_md.init_IRQ(); +} |