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