148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
/*
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* File: arch/blackfin/kernel/irqchip.c
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* Based on:
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* Author:
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*
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* Created:
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* Description: This file contains the simple DMA Implementation for Blackfin
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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static unsigned long irq_err_count;
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static spinlock_t irq_controller_lock;
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/*
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* Dummy mask/unmask handler
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*/
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void dummy_mask_unmask_irq(unsigned int irq)
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{
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}
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void ack_bad_irq(unsigned int irq)
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{
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irq_err_count += 1;
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printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
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}
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EXPORT_SYMBOL(ack_bad_irq);
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static struct irq_chip bad_chip = {
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.ack = dummy_mask_unmask_irq,
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.mask = dummy_mask_unmask_irq,
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.unmask = dummy_mask_unmask_irq,
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};
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static struct irq_desc bad_irq_desc = {
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.chip = &bad_chip,
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.handle_irq = handle_bad_irq,
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.depth = 1,
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};
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v;
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struct irqaction *action;
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unsigned long flags;
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if (i < NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto unlock;
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seq_printf(p, "%3d: %10u ", i, kstat_irqs(i));
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seq_printf(p, " %s", action->name);
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for (action = action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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unlock:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == NR_IRQS) {
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seq_printf(p, "Err: %10lu\n", irq_err_count);
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}
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return 0;
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}
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/*
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* do_IRQ handles all hardware IRQs. Decoded IRQs should not
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* come via this function. Instead, they should provide their
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* own 'handler'
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*/
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#ifdef CONFIG_DO_IRQ_L1
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asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)__attribute__((l1_text));
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#endif
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asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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struct irq_desc *desc = irq_desc + irq;
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unsigned short pending, other_ints;
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old_regs = set_irq_regs(regs);
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/*
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* Some hardware gives randomly wrong interrupts. Rather
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* than crashing, do something sensible.
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*/
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if (irq >= NR_IRQS)
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desc = &bad_irq_desc;
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irq_enter();
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generic_handle_irq(irq);
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/* If we're the only interrupt running (ignoring IRQ15 which is for
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syscalls), lower our priority to IRQ14 so that softirqs run at
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that level. If there's another, lower-level interrupt, irq_exit
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will defer softirqs to that. */
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CSYNC();
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pending = bfin_read_IPEND() & ~0x8000;
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other_ints = pending & (pending - 1);
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if (other_ints == 0)
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lower_to_irq14();
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irq_exit();
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set_irq_regs(old_regs);
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}
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void __init init_IRQ(void)
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{
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struct irq_desc *desc;
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int irq;
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spin_lock_init(&irq_controller_lock);
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for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++) {
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*desc = bad_irq_desc;
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}
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init_arch_irq();
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}
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