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
  29 extern u32 auto_irqhandler_fixup[];
  30 extern u16 user_irqvec_fixup[];
  31
  32 static int m68k_first_user_vec;
  33
  34 static struct irq_chip auto_irq_chip = {
  35         .name           = "auto",
  36         .irq_startup    = m68k_irq_startup,
  37         .irq_shutdown   = m68k_irq_shutdown,
  38 };
  39
  40 static 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
  57 void __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  */
  81 void __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  */
  97 void __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_and_handler(i, &user_irq_chip, handle_simple_irq);
 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  */
 121 void 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
 134 unsigned 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
 143 unsigned int m68k_irq_startup(struct irq_data *data)
 144 {
 145         return m68k_irq_startup_irq(data->irq);
 146 }
 147
 148 void 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
 159 unsigned 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
 168 EXPORT_SYMBOL(irq_canonicalize);
 169
 170
 171 asmlinkage 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 }