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/system.h>
  19 #include <asm/irq.h>
  20 #include <asm/traps.h>
  21 #include <asm/page.h>
  22 #include <asm/machdep.h>
  23 #include <asm/cacheflush.h>
  24 #include <asm/irq_regs.h>
  25
  26 #ifdef CONFIG_Q40
  27 #include <asm/q40ints.h>
  28 #endif
  29
  30 extern u32 auto_irqhandler_fixup[];
  31 extern u16 user_irqvec_fixup[];
  32
  33 static int m68k_first_user_vec;
  34
  35 static struct irq_chip auto_irq_chip = {
  36         .name           = "auto",
  37         .irq_startup    = m68k_irq_startup,
  38         .irq_shutdown   = m68k_irq_shutdown,
  39 };
  40
  41 static struct irq_chip user_irq_chip = {
  42         .name           = "user",
  43         .irq_startup    = m68k_irq_startup,
  44         .irq_shutdown   = m68k_irq_shutdown,
  45 };
  46
  47 /*
  48  * void init_IRQ(void)
  49  *
  50  * Parameters:  None
  51  *
  52  * Returns:     Nothing
  53  *
  54  * This function should be called during kernel startup to initialize
  55  * the IRQ handling routines.
  56  */
  57
  58 void __init init_IRQ(void)
  59 {
  60         int i;
  61
  62         /* assembly irq entry code relies on this... */
  63         if (HARDIRQ_MASK != 0x00ff0000) {
  64                 extern void hardirq_mask_is_broken(void);
  65                 hardirq_mask_is_broken();
  66         }
  67
  68         for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
  69                 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
  70
  71         mach_init_IRQ();
  72 }
  73
  74 /**
  75  * m68k_setup_auto_interrupt
  76  * @handler: called from auto vector interrupts
  77  *
  78  * setup the handler to be called from auto vector interrupts instead of the
  79  * standard do_IRQ(), it will be called with irq numbers in the range
  80  * from IRQ_AUTO_1 - IRQ_AUTO_7.
  81  */
  82 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
  83 {
  84         if (handler)
  85                 *auto_irqhandler_fixup = (u32)handler;
  86         flush_icache();
  87 }
  88
  89 /**
  90  * m68k_setup_user_interrupt
  91  * @vec: first user vector interrupt to handle
  92  * @cnt: number of active user vector interrupts
  93  *
  94  * setup user vector interrupts, this includes activating the specified range
  95  * of interrupts, only then these interrupts can be requested (note: this is
  96  * different from auto vector interrupts).
  97  */
  98 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
  99 {
 100         int i;
 101
 102         BUG_ON(IRQ_USER + cnt > NR_IRQS);
 103         m68k_first_user_vec = vec;
 104         for (i = 0; i < cnt; i++)
 105                 irq_set_chip(IRQ_USER + i, &user_irq_chip);
 106         *user_irqvec_fixup = vec - IRQ_USER;
 107         flush_icache();
 108 }
 109
 110 /**
 111  * m68k_setup_irq_controller
 112  * @chip: irq chip which controls specified irq
 113  * @handle: flow handler which handles specified irq
 114  * @irq: first irq to be managed by the controller
 115  * @cnt: number of irqs to be managed by the controller
 116  *
 117  * Change the controller for the specified range of irq, which will be used to
 118  * manage these irq. auto/user irq already have a default controller, which can
 119  * be changed as well, but the controller probably should use m68k_irq_startup/
 120  * m68k_irq_shutdown.
 121  */
 122 void m68k_setup_irq_controller(struct irq_chip *chip,
 123                                irq_flow_handler_t handle, unsigned int irq,
 124                                unsigned int cnt)
 125 {
 126         int i;
 127
 128         for (i = 0; i < cnt; i++) {
 129                 irq_set_chip(irq + i, chip);
 130                 if (handle)
 131                         irq_set_handler(irq + i, handle);
 132         }
 133 }
 134
 135 unsigned int m68k_irq_startup_irq(unsigned int irq)
 136 {
 137         if (irq <= IRQ_AUTO_7)
 138                 vectors[VEC_SPUR + irq] = auto_inthandler;
 139         else
 140                 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
 141         return 0;
 142 }
 143
 144 unsigned int m68k_irq_startup(struct irq_data *data)
 145 {
 146         return m68k_irq_startup_irq(data->irq);
 147 }
 148
 149 void m68k_irq_shutdown(struct irq_data *data)
 150 {
 151         unsigned int irq = data->irq;
 152
 153         if (irq <= IRQ_AUTO_7)
 154                 vectors[VEC_SPUR + irq] = bad_inthandler;
 155         else
 156                 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
 157 }
 158
 159
 160 unsigned int irq_canonicalize(unsigned int irq)
 161 {
 162 #ifdef CONFIG_Q40
 163         if (MACH_IS_Q40 && irq == 11)
 164                 irq = 10;
 165 #endif
 166         return irq;
 167 }
 168
 169 EXPORT_SYMBOL(irq_canonicalize);
 170
 171
 172 asmlinkage void handle_badint(struct pt_regs *regs)
 173 {
 174         atomic_inc(&irq_err_count);
 175         pr_warn("unexpected interrupt from %u\n", regs->vector);
 176 }