xref: /openbmc/linux/arch/m68k/kernel/ints.c (revision abcfc543)
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 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 	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
62 		irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
63 
64 	mach_init_IRQ();
65 }
66 
67 /**
68  * m68k_setup_auto_interrupt
69  * @handler: called from auto vector interrupts
70  *
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.
74  */
m68k_setup_auto_interrupt(void (* handler)(unsigned int,struct pt_regs *))75 void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
76 {
77 	if (handler)
78 		*auto_irqhandler_fixup = (u32)handler;
79 	flush_icache();
80 }
81 
82 /**
83  * m68k_setup_user_interrupt
84  * @vec: first user vector interrupt to handle
85  * @cnt: number of active user vector interrupts
86  *
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).
90  */
m68k_setup_user_interrupt(unsigned int vec,unsigned int cnt)91 void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt)
92 {
93 	int i;
94 
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;
100 	flush_icache();
101 }
102 
103 /**
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
109  *
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/
113  * m68k_irq_shutdown.
114  */
m68k_setup_irq_controller(struct irq_chip * chip,irq_flow_handler_t handle,unsigned int irq,unsigned int cnt)115 void m68k_setup_irq_controller(struct irq_chip *chip,
116 			       irq_flow_handler_t handle, unsigned int irq,
117 			       unsigned int cnt)
118 {
119 	int i;
120 
121 	for (i = 0; i < cnt; i++) {
122 		irq_set_chip(irq + i, chip);
123 		if (handle)
124 			irq_set_handler(irq + i, handle);
125 	}
126 }
127 
m68k_irq_startup_irq(unsigned int irq)128 unsigned int m68k_irq_startup_irq(unsigned int irq)
129 {
130 	if (irq <= IRQ_AUTO_7)
131 		vectors[VEC_SPUR + irq] = auto_inthandler;
132 	else
133 		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
134 	return 0;
135 }
136 
m68k_irq_startup(struct irq_data * data)137 unsigned int m68k_irq_startup(struct irq_data *data)
138 {
139 	return m68k_irq_startup_irq(data->irq);
140 }
141 
m68k_irq_shutdown(struct irq_data * data)142 void m68k_irq_shutdown(struct irq_data *data)
143 {
144 	unsigned int irq = data->irq;
145 
146 	if (irq <= IRQ_AUTO_7)
147 		vectors[VEC_SPUR + irq] = bad_inthandler;
148 	else
149 		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
150 }
151 
152 
irq_canonicalize(unsigned int irq)153 unsigned int irq_canonicalize(unsigned int irq)
154 {
155 #ifdef CONFIG_Q40
156 	if (MACH_IS_Q40 && irq == 11)
157 		irq = 10;
158 #endif
159 	return irq;
160 }
161 
162 EXPORT_SYMBOL(irq_canonicalize);
163 
164 
handle_badint(struct pt_regs * regs)165 asmlinkage void handle_badint(struct pt_regs *regs)
166 {
167 	atomic_inc(&irq_err_count);
168 	pr_warn("unexpected interrupt from %u\n", regs->vector);
169 }
170