2 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
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
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>
17 #include <asm/setup.h>
18 #include <asm/system.h>
20 #include <asm/traps.h>
22 #include <asm/machdep.h>
23 #include <asm/cacheflush.h>
24 #include <asm/irq_regs.h>
27 #include <asm/q40ints.h>
30 extern u32 auto_irqhandler_fixup[];
31 extern u32 user_irqhandler_fixup[];
32 extern u16 user_irqvec_fixup[];
34 static int m68k_first_user_vec;
36 static struct irq_chip auto_irq_chip = {
38 .irq_startup = m68k_irq_startup,
39 .irq_shutdown = m68k_irq_shutdown,
42 static struct irq_chip user_irq_chip = {
44 .irq_startup = m68k_irq_startup,
45 .irq_shutdown = m68k_irq_shutdown,
55 * This function should be called during kernel startup to initialize
56 * the IRQ handling routines.
59 void __init init_IRQ(void)
63 /* assembly irq entry code relies on this... */
64 if (HARDIRQ_MASK != 0x00ff0000) {
65 extern void hardirq_mask_is_broken(void);
66 hardirq_mask_is_broken();
69 for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
70 irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
76 * m68k_setup_auto_interrupt
77 * @handler: called from auto vector interrupts
79 * setup the handler to be called from auto vector interrupts instead of the
80 * standard do_IRQ(), it will be called with irq numbers in the range
81 * from IRQ_AUTO_1 - IRQ_AUTO_7.
83 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
86 *auto_irqhandler_fixup = (u32)handler;
91 * m68k_setup_user_interrupt
92 * @vec: first user vector interrupt to handle
93 * @cnt: number of active user vector interrupts
94 * @handler: called from user vector interrupts
96 * setup user vector interrupts, this includes activating the specified range
97 * of interrupts, only then these interrupts can be requested (note: this is
98 * different from auto vector interrupts). An optional handler can be installed
99 * to be called instead of the default do_IRQ(), it will be called
100 * with irq numbers starting from IRQ_USER.
102 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
103 void (*handler)(unsigned int, struct pt_regs *))
107 BUG_ON(IRQ_USER + cnt > NR_IRQS);
108 m68k_first_user_vec = vec;
109 for (i = 0; i < cnt; i++)
110 irq_set_chip(IRQ_USER + i, &user_irq_chip);
111 *user_irqvec_fixup = vec - IRQ_USER;
113 *user_irqhandler_fixup = (u32)handler;
118 * m68k_setup_irq_controller
119 * @chip: irq chip which controls specified irq
120 * @handle: flow handler which handles specified irq
121 * @irq: first irq to be managed by the controller
122 * @cnt: number of irqs to be managed by the controller
124 * Change the controller for the specified range of irq, which will be used to
125 * manage these irq. auto/user irq already have a default controller, which can
126 * be changed as well, but the controller probably should use m68k_irq_startup/
129 void m68k_setup_irq_controller(struct irq_chip *chip,
130 irq_flow_handler_t handle, unsigned int irq,
135 for (i = 0; i < cnt; i++) {
136 irq_set_chip(irq + i, chip);
138 irq_set_handler(irq + i, handle);
142 unsigned int m68k_irq_startup_irq(unsigned int irq)
144 if (irq <= IRQ_AUTO_7)
145 vectors[VEC_SPUR + irq] = auto_inthandler;
147 vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
151 unsigned int m68k_irq_startup(struct irq_data *data)
153 return m68k_irq_startup_irq(data->irq);
156 void m68k_irq_shutdown(struct irq_data *data)
158 unsigned int irq = data->irq;
160 if (irq <= IRQ_AUTO_7)
161 vectors[VEC_SPUR + irq] = bad_inthandler;
163 vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
167 unsigned int irq_canonicalize(unsigned int irq)
170 if (MACH_IS_Q40 && irq == 11)
176 EXPORT_SYMBOL(irq_canonicalize);
179 asmlinkage void handle_badint(struct pt_regs *regs)
181 atomic_inc(&irq_err_count);
182 pr_warn("unexpected interrupt from %u\n", regs->vector);