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/errno.h>
14 #include <linux/init.h>
15 #include <linux/irq.h>
17 #include <asm/setup.h>
19 #include <asm/traps.h>
21 #include <asm/machdep.h>
22 #include <asm/cacheflush.h>
23 #include <asm/irq_regs.h>
26 #include <asm/q40ints.h>
29 extern u32 auto_irqhandler_fixup
[];
30 extern u16 user_irqvec_fixup
[];
32 static int m68k_first_user_vec
;
34 static struct irq_chip auto_irq_chip
= {
36 .irq_startup
= m68k_irq_startup
,
37 .irq_shutdown
= m68k_irq_shutdown
,
40 static struct irq_chip user_irq_chip
= {
42 .irq_startup
= m68k_irq_startup
,
43 .irq_shutdown
= m68k_irq_shutdown
,
53 * This function should be called during kernel startup to initialize
54 * the IRQ handling routines.
57 void __init
init_IRQ(void)
61 for (i
= IRQ_AUTO_1
; i
<= IRQ_AUTO_7
; i
++)
62 irq_set_chip_and_handler(i
, &auto_irq_chip
, handle_simple_irq
);
68 * m68k_setup_auto_interrupt
69 * @handler: called from auto vector interrupts
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.
75 void __init
m68k_setup_auto_interrupt(void (*handler
)(unsigned int, struct pt_regs
*))
78 *auto_irqhandler_fixup
= (u32
)handler
;
83 * m68k_setup_user_interrupt
84 * @vec: first user vector interrupt to handle
85 * @cnt: number of active user vector interrupts
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).
91 void __init
m68k_setup_user_interrupt(unsigned int vec
, unsigned int cnt
)
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
;
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
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/
115 void m68k_setup_irq_controller(struct irq_chip
*chip
,
116 irq_flow_handler_t handle
, unsigned int irq
,
121 for (i
= 0; i
< cnt
; i
++) {
122 irq_set_chip(irq
+ i
, chip
);
124 irq_set_handler(irq
+ i
, handle
);
128 unsigned int m68k_irq_startup_irq(unsigned int irq
)
130 if (irq
<= IRQ_AUTO_7
)
131 vectors
[VEC_SPUR
+ irq
] = auto_inthandler
;
133 vectors
[m68k_first_user_vec
+ irq
- IRQ_USER
] = user_inthandler
;
137 unsigned int m68k_irq_startup(struct irq_data
*data
)
139 return m68k_irq_startup_irq(data
->irq
);
142 void m68k_irq_shutdown(struct irq_data
*data
)
144 unsigned int irq
= data
->irq
;
146 if (irq
<= IRQ_AUTO_7
)
147 vectors
[VEC_SPUR
+ irq
] = bad_inthandler
;
149 vectors
[m68k_first_user_vec
+ irq
- IRQ_USER
] = bad_inthandler
;
153 unsigned int irq_canonicalize(unsigned int irq
)
156 if (MACH_IS_Q40
&& irq
== 11)
162 EXPORT_SYMBOL(irq_canonicalize
);
165 asmlinkage
void handle_badint(struct pt_regs
*regs
)
167 atomic_inc(&irq_err_count
);
168 pr_warn("unexpected interrupt from %u\n", regs
->vector
);