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
init_IRQ(void)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 */
m68k_setup_auto_interrupt(void (* handler)(unsigned int,struct pt_regs *))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 */
m68k_setup_user_interrupt(unsigned int vec,unsigned int cnt)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(IRQ_USER + i, &user_irq_chip);
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 */
m68k_setup_irq_controller(struct irq_chip * chip,irq_flow_handler_t handle,unsigned int irq,unsigned int cnt)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
m68k_irq_startup_irq(unsigned int irq)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
m68k_irq_startup(struct irq_data * data)143 unsigned int m68k_irq_startup(struct irq_data *data)
144 {
145 return m68k_irq_startup_irq(data->irq);
146 }
147
m68k_irq_shutdown(struct irq_data * data)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
irq_canonicalize(unsigned int irq)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
handle_badint(struct pt_regs * regs)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 }
176