176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/*
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* linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include <asm/page.h>
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#include <asm/machdep.h>
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#include <asm/cacheflush.h>
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#include <asm/irq_regs.h>
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#ifdef CONFIG_Q40
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#include <asm/q40ints.h>
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#endif
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extern u32 auto_irqhandler_fixup[];
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extern u16 user_irqvec_fixup[];
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static int m68k_first_user_vec;
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static struct irq_chip auto_irq_chip = {
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.name = "auto",
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.irq_startup = m68k_irq_startup,
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.irq_shutdown = m68k_irq_shutdown,
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};
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static struct irq_chip user_irq_chip = {
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.name = "user",
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.irq_startup = m68k_irq_startup,
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.irq_shutdown = m68k_irq_shutdown,
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};
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/*
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* void init_IRQ(void)
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*
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* Parameters: None
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*
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* Returns: Nothing
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*
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* This function should be called during kernel startup to initialize
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* the IRQ handling routines.
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*/
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void __init init_IRQ(void)
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{
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int i;
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/* assembly irq entry code relies on this... */
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if (HARDIRQ_MASK != 0x00ff0000) {
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extern void hardirq_mask_is_broken(void);
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hardirq_mask_is_broken();
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}
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for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
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irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
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mach_init_IRQ();
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}
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/**
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* m68k_setup_auto_interrupt
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* @handler: called from auto vector interrupts
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*
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* setup the handler to be called from auto vector interrupts instead of the
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* standard do_IRQ(), it will be called with irq numbers in the range
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* from IRQ_AUTO_1 - IRQ_AUTO_7.
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*/
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void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
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{
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if (handler)
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*auto_irqhandler_fixup = (u32)handler;
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flush_icache();
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}
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/**
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* m68k_setup_user_interrupt
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* @vec: first user vector interrupt to handle
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* @cnt: number of active user vector interrupts
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*
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* setup user vector interrupts, this includes activating the specified range
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* of interrupts, only then these interrupts can be requested (note: this is
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* different from auto vector interrupts).
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*/
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void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
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{
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int i;
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BUG_ON(IRQ_USER + cnt > NR_IRQS);
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m68k_first_user_vec = vec;
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for (i = 0; i < cnt; i++)
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irq_set_chip(IRQ_USER + i, &user_irq_chip);
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*user_irqvec_fixup = vec - IRQ_USER;
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flush_icache();
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}
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/**
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* m68k_setup_irq_controller
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* @chip: irq chip which controls specified irq
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* @handle: flow handler which handles specified irq
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* @irq: first irq to be managed by the controller
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* @cnt: number of irqs to be managed by the controller
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*
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* Change the controller for the specified range of irq, which will be used to
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* manage these irq. auto/user irq already have a default controller, which can
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* be changed as well, but the controller probably should use m68k_irq_startup/
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* m68k_irq_shutdown.
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*/
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void m68k_setup_irq_controller(struct irq_chip *chip,
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irq_flow_handler_t handle, unsigned int irq,
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unsigned int cnt)
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{
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int i;
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for (i = 0; i < cnt; i++) {
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irq_set_chip(irq + i, chip);
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if (handle)
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irq_set_handler(irq + i, handle);
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}
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}
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unsigned int m68k_irq_startup_irq(unsigned int irq)
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{
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if (irq <= IRQ_AUTO_7)
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vectors[VEC_SPUR + irq] = auto_inthandler;
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else
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vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
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return 0;
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}
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unsigned int m68k_irq_startup(struct irq_data *data)
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{
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return m68k_irq_startup_irq(data->irq);
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}
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void m68k_irq_shutdown(struct irq_data *data)
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{
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unsigned int irq = data->irq;
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if (irq <= IRQ_AUTO_7)
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vectors[VEC_SPUR + irq] = bad_inthandler;
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else
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vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
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}
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unsigned int irq_canonicalize(unsigned int irq)
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{
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#ifdef CONFIG_Q40
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if (MACH_IS_Q40 && irq == 11)
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irq = 10;
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#endif
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return irq;
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}
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EXPORT_SYMBOL(irq_canonicalize);
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asmlinkage void handle_badint(struct pt_regs *regs)
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{
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atomic_inc(&irq_err_count);
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pr_warn("unexpected interrupt from %u\n", regs->vector);
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}
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