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/kernel_stat.h>
  14#include <linux/errno.h>
  15#include <linux/init.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        /* assembly irq entry code relies on this... */
  62        if (HARDIRQ_MASK != 0x00ff0000) {
  63                extern void hardirq_mask_is_broken(void);
  64                hardirq_mask_is_broken();
  65        }
  66
  67        for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
  68                irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
  69
  70        mach_init_IRQ();
  71}
  72
  73/**
  74 * m68k_setup_auto_interrupt
  75 * @handler: called from auto vector interrupts
  76 *
  77 * setup the handler to be called from auto vector interrupts instead of the
  78 * standard do_IRQ(), it will be called with irq numbers in the range
  79 * from IRQ_AUTO_1 - IRQ_AUTO_7.
  80 */
  81void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
  82{
  83        if (handler)
  84                *auto_irqhandler_fixup = (u32)handler;
  85        flush_icache();
  86}
  87
  88/**
  89 * m68k_setup_user_interrupt
  90 * @vec: first user vector interrupt to handle
  91 * @cnt: number of active user vector interrupts
  92 *
  93 * setup user vector interrupts, this includes activating the specified range
  94 * of interrupts, only then these interrupts can be requested (note: this is
  95 * different from auto vector interrupts).
  96 */
  97void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
  98{
  99        int i;
 100
 101        BUG_ON(IRQ_USER + cnt > NR_IRQS);
 102        m68k_first_user_vec = vec;
 103        for (i = 0; i < cnt; i++)
 104                irq_set_chip(IRQ_USER + i, &user_irq_chip);
 105        *user_irqvec_fixup = vec - IRQ_USER;
 106        flush_icache();
 107}
 108
 109/**
 110 * m68k_setup_irq_controller
 111 * @chip: irq chip which controls specified irq
 112 * @handle: flow handler which handles specified irq
 113 * @irq: first irq to be managed by the controller
 114 * @cnt: number of irqs to be managed by the controller
 115 *
 116 * Change the controller for the specified range of irq, which will be used to
 117 * manage these irq. auto/user irq already have a default controller, which can
 118 * be changed as well, but the controller probably should use m68k_irq_startup/
 119 * m68k_irq_shutdown.
 120 */
 121void m68k_setup_irq_controller(struct irq_chip *chip,
 122                               irq_flow_handler_t handle, unsigned int irq,
 123                               unsigned int cnt)
 124{
 125        int i;
 126
 127        for (i = 0; i < cnt; i++) {
 128                irq_set_chip(irq + i, chip);
 129                if (handle)
 130                        irq_set_handler(irq + i, handle);
 131        }
 132}
 133
 134unsigned int m68k_irq_startup_irq(unsigned int irq)
 135{
 136        if (irq <= IRQ_AUTO_7)
 137                vectors[VEC_SPUR + irq] = auto_inthandler;
 138        else
 139                vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
 140        return 0;
 141}
 142
 143unsigned int m68k_irq_startup(struct irq_data *data)
 144{
 145        return m68k_irq_startup_irq(data->irq);
 146}
 147
 148void m68k_irq_shutdown(struct irq_data *data)
 149{
 150        unsigned int irq = data->irq;
 151
 152        if (irq <= IRQ_AUTO_7)
 153                vectors[VEC_SPUR + irq] = bad_inthandler;
 154        else
 155                vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
 156}
 157
 158
 159unsigned int irq_canonicalize(unsigned int irq)
 160{
 161#ifdef CONFIG_Q40
 162        if (MACH_IS_Q40 && irq == 11)
 163                irq = 10;
 164#endif
 165        return irq;
 166}
 167
 168EXPORT_SYMBOL(irq_canonicalize);
 169
 170
 171asmlinkage void handle_badint(struct pt_regs *regs)
 172{
 173        atomic_inc(&irq_err_count);
 174        pr_warn("unexpected interrupt from %u\n", regs->vector);
 175}
 176