LXR linux/arch/m68k/kernel/ints.c

   1/*
   2 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file COPYING in the main directory of this archive
   6 * for more details.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/types.h>
  11#include <linux/sched.h>
  12#include <linux/interrupt.h>
  13#include <linux/errno.h>
  14#include <linux/init.h>
  15#include <linux/irq.h>
  16
  17#include <asm/setup.h>
  18#include <asm/irq.h>
  19#include <asm/traps.h>
  20#include <asm/page.h>
  21#include <asm/machdep.h>
  22#include <asm/cacheflush.h>
  23#include <asm/irq_regs.h>
  24
  25#ifdef CONFIG_Q40
  26#include <asm/q40ints.h>
  27#endif
  28
  29extern u32 auto_irqhandler_fixup[];
  30extern u16 user_irqvec_fixup[];
  31
  32static int m68k_first_user_vec;
  33
  34static struct irq_chip auto_irq_chip = {
  35        .name           = "auto",
  36        .irq_startup    = m68k_irq_startup,
  37        .irq_shutdown   = m68k_irq_shutdown,
  38};
  39
  40static struct irq_chip user_irq_chip = {
  41        .name           = "user",
  42        .irq_startup    = m68k_irq_startup,
  43        .irq_shutdown   = m68k_irq_shutdown,
  44};
  45
  46/*
  47 * void init_IRQ(void)
  48 *
  49 * Parameters:  None
  50 *
  51 * Returns:     Nothing
  52 *
  53 * This function should be called during kernel startup to initialize
  54 * the IRQ handling routines.
  55 */
  56
  57void __init init_IRQ(void)
  58{
  59        int i;
  60
  61        for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
  62                irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
  63
  64        mach_init_IRQ();
  65}
  66
  67/**
  68 * m68k_setup_auto_interrupt
  69 * @handler: called from auto vector interrupts
  70 *
  71 * setup the handler to be called from auto vector interrupts instead of the
  72 * standard do_IRQ(), it will be called with irq numbers in the range
  73 * from IRQ_AUTO_1 - IRQ_AUTO_7.
  74 */
  75void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
  76{
  77        if (handler)
  78                *auto_irqhandler_fixup = (u32)handler;
  79        flush_icache();
  80}
  81
  82/**
  83 * m68k_setup_user_interrupt
  84 * @vec: first user vector interrupt to handle
  85 * @cnt: number of active user vector interrupts
  86 *
  87 * setup user vector interrupts, this includes activating the specified range
  88 * of interrupts, only then these interrupts can be requested (note: this is
  89 * different from auto vector interrupts).
  90 */
  91void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
  92{
  93        int i;
  94
  95        BUG_ON(IRQ_USER + cnt > NR_IRQS);
  96        m68k_first_user_vec = vec;
  97        for (i = 0; i < cnt; i++)
  98                irq_set_chip_and_handler(i, &user_irq_chip, handle_simple_irq);
  99        *user_irqvec_fixup = vec - IRQ_USER;
 100        flush_icache();
 101}
 102
 103/**
 104 * m68k_setup_irq_controller
 105 * @chip: irq chip which controls specified irq
 106 * @handle: flow handler which handles specified irq
 107 * @irq: first irq to be managed by the controller
 108 * @cnt: number of irqs to be managed by the controller
 109 *
 110 * Change the controller for the specified range of irq, which will be used to
 111 * manage these irq. auto/user irq already have a default controller, which can
 112 * be changed as well, but the controller probably should use m68k_irq_startup/
 113 * m68k_irq_shutdown.
 114 */
 115void m68k_setup_irq_controller(struct irq_chip *chip,
 116                               irq_flow_handler_t handle, unsigned int irq,
 117                               unsigned int cnt)
 118{
 119        int i;
 120
 121        for (i = 0; i < cnt; i++) {
 122                irq_set_chip(irq + i, chip);
 123                if (handle)
 124                        irq_set_handler(irq + i, handle);
 125        }
 126}
 127
 128unsigned int m68k_irq_startup_irq(unsigned int irq)
 129{
 130        if (irq <= IRQ_AUTO_7)
 131                vectors[VEC_SPUR + irq] = auto_inthandler;
 132        else
 133                vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
 134        return 0;
 135}
 136
 137unsigned int m68k_irq_startup(struct irq_data *data)
 138{
 139        return m68k_irq_startup_irq(data->irq);
 140}
 141
 142void m68k_irq_shutdown(struct irq_data *data)
 143{
 144        unsigned int irq = data->irq;
 145
 146        if (irq <= IRQ_AUTO_7)
 147                vectors[VEC_SPUR + irq] = bad_inthandler;
 148        else
 149                vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
 150}
 151
 152
 153unsigned int irq_canonicalize(unsigned int irq)
 154{
 155#ifdef CONFIG_Q40
 156        if (MACH_IS_Q40 && irq == 11)
 157                irq = 10;
 158#endif
 159        return irq;
 160}
 161
 162EXPORT_SYMBOL(irq_canonicalize);
 163
 164
 165asmlinkage void handle_badint(struct pt_regs *regs)
 166{
 167        atomic_inc(&irq_err_count);
 168        pr_warn("unexpected interrupt from %u\n", regs->vector);
 169}
 170