Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Code to handle x86 style IRQs plus some generic interrupt stuff.

 *

 * Copyright (C) 1992 Linus Torvalds

 * Copyright (C) 1994 - 2000 Ralf Baechle

 */

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kernel_stat.h>

#include <linux/module.h>

#include <linux/proc_fs.h>

#include <linux/slab.h>

#include <linux/mm.h>

#include <linux/random.h>

#include <linux/sched.h>

#include <linux/seq_file.h>

#include <linux/kallsyms.h>

#include <asm/atomic.h>

#include <asm/system.h>

#include <asm/uaccess.h>

static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];

int allocate_irqno(void)

{

        int irq;

again:

        irq = find_first_zero_bit(irq_map, NR_IRQS);

        if (irq >= NR_IRQS)

                return -ENOSPC;

        if (test_and_set_bit(irq, irq_map))

                goto again;

        return irq;

}

EXPORT_SYMBOL_GPL(allocate_irqno);

/*

 * Allocate the 16 legacy interrupts for i8259 devices.  This happens early

 * in the kernel initialization so treating allocation failure as BUG() is

 * ok.

 */

void __init alloc_legacy_irqno(void)

{

        int i;

        for (i = 0; i <= 16; i++)

                BUG_ON(test_and_set_bit(i, irq_map));

}

void free_irqno(unsigned int irq)

{

        smp_mb__before_clear_bit();

        clear_bit(irq, irq_map);

        smp_mb__after_clear_bit();

}

EXPORT_SYMBOL_GPL(free_irqno);

/*

 * 'what should we do if we get a hw irq event on an illegal vector'.

 * each architecture has to answer this themselves.

 */

void ack_bad_irq(unsigned int irq)

{

        smtc_im_ack_irq(irq);

        printk("unexpected IRQ # %d\n", irq);

}

atomic_t irq_err_count;

/*

 * Generic, controller-independent functions:

 */

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_printf(p, "           ");

                for_each_online_cpu(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)

                        goto skip;

                seq_printf(p, "%3d: ", i);

#ifndef CONFIG_SMP

                seq_printf(p, "%10u ", kstat_irqs(i));

#else

                for_each_online_cpu(j)

                        seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);

#endif

                seq_printf(p, " %14s", irq_desc[i].chip->name);

                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) {

                seq_putc(p, '\n');

                seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));

        }

        return 0;

}

asmlinkage void spurious_interrupt(void)

{

        atomic_inc(&irq_err_count);

}

#ifdef CONFIG_KGDB

extern void breakpoint(void);

extern void set_debug_traps(void);

static int kgdb_flag = 1;

static int __init nokgdb(char *str)

{

        kgdb_flag = 0;

        return 1;

}

__setup("nokgdb", nokgdb);

#endif

void __init init_IRQ(void)

{

        arch_init_irq();

#ifdef CONFIG_KGDB

        if (kgdb_flag) {

                printk("Wait for gdb client connection ...\n");

                set_debug_traps();

                breakpoint();

        }

#endif

}