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