File: /usr/src/linux/arch/m68k/kernel/ints.c
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 * 07/03/96: Timer initialization, and thus mach_sched_init(),
9 * removed from request_irq() and moved to init_time().
10 * We should therefore consider renaming our add_isr() and
11 * remove_isr() to request_irq() and free_irq()
12 * respectively, so they are compliant with the other
13 * architectures. /Jes
14 * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
15 * Removed irq list support, if any machine needs an irq server
16 * it must implement this itself (as it's already done), instead
17 * only default handler are used with mach_default_handler.
18 * request_irq got some flags different from other architectures:
19 * - IRQ_FLG_REPLACE : Replace an existing handler (the default one
20 * can be replaced without this flag)
21 * - IRQ_FLG_LOCK : handler can't be replaced
22 * There are other machine depending flags, see there
23 * If you want to replace a default handler you should know what
24 * you're doing, since it might handle different other irq sources
25 * which must be served /Roman Zippel
26 */
27
28 #include <linux/config.h>
29 #include <linux/types.h>
30 #include <linux/sched.h>
31 #include <linux/kernel_stat.h>
32 #include <linux/errno.h>
33 #include <linux/init.h>
34
35 #include <asm/setup.h>
36 #include <asm/system.h>
37 #include <asm/irq.h>
38 #include <asm/traps.h>
39 #include <asm/page.h>
40 #include <asm/machdep.h>
41
42 #ifdef CONFIG_Q40
43 #include <asm/q40ints.h>
44 #endif
45
46 /* table for system interrupt handlers */
47 static irq_handler_t irq_list[SYS_IRQS];
48
49 static const char *default_names[SYS_IRQS] = {
50 "spurious int", "int1 handler", "int2 handler", "int3 handler",
51 "int4 handler", "int5 handler", "int6 handler", "int7 handler"
52 };
53
54 /* The number of spurious interrupts */
55 volatile unsigned int num_spurious;
56
57 #define NUM_IRQ_NODES 100
58 static irq_node_t nodes[NUM_IRQ_NODES];
59
60 static void dummy_enable_irq(unsigned int irq);
61 static void dummy_disable_irq(unsigned int irq);
62 static int dummy_request_irq(unsigned int irq,
63 void (*handler) (int, void *, struct pt_regs *),
64 unsigned long flags, const char *devname, void *dev_id);
65 static void dummy_free_irq(unsigned int irq, void *dev_id);
66
67 void (*enable_irq) (unsigned int) = dummy_enable_irq;
68 void (*disable_irq) (unsigned int) = dummy_disable_irq;
69
70 int (*mach_request_irq) (unsigned int, void (*)(int, void *, struct pt_regs *),
71 unsigned long, const char *, void *) = dummy_request_irq;
72 void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
73
74 void init_irq_proc(void);
75
76 /*
77 * void init_IRQ(void)
78 *
79 * Parameters: None
80 *
81 * Returns: Nothing
82 *
83 * This function should be called during kernel startup to initialize
84 * the IRQ handling routines.
85 */
86
87 void __init init_IRQ(void)
88 {
89 int i;
90
91 for (i = 0; i < SYS_IRQS; i++) {
92 if (mach_default_handler)
93 irq_list[i].handler = (*mach_default_handler)[i];
94 irq_list[i].flags = 0;
95 irq_list[i].dev_id = NULL;
96 irq_list[i].devname = default_names[i];
97 }
98
99 for (i = 0; i < NUM_IRQ_NODES; i++)
100 nodes[i].handler = NULL;
101
102 mach_init_IRQ ();
103 }
104
105 irq_node_t *new_irq_node(void)
106 {
107 irq_node_t *node;
108 short i;
109
110 for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
111 if (!node->handler)
112 return node;
113
114 printk ("new_irq_node: out of nodes\n");
115 return NULL;
116 }
117
118 /*
119 * We will keep these functions until I have convinced Linus to move
120 * the declaration of them from include/linux/sched.h to
121 * include/asm/irq.h.
122 */
123 int request_irq(unsigned int irq,
124 void (*handler) (int, void *, struct pt_regs *),
125 unsigned long flags, const char *devname, void *dev_id)
126 {
127 return mach_request_irq(irq, handler, flags, devname, dev_id);
128 }
129
130 void free_irq(unsigned int irq, void *dev_id)
131 {
132 mach_free_irq(irq, dev_id);
133 }
134
135 int sys_request_irq(unsigned int irq,
136 void (*handler)(int, void *, struct pt_regs *),
137 unsigned long flags, const char *devname, void *dev_id)
138 {
139 if (irq < IRQ1 || irq > IRQ7) {
140 printk("%s: Incorrect IRQ %d from %s\n",
141 __FUNCTION__, irq, devname);
142 return -ENXIO;
143 }
144
145 #if 0
146 if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
147 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
148 printk("%s: IRQ %d from %s is not replaceable\n",
149 __FUNCTION__, irq, irq_list[irq].devname);
150 return -EBUSY;
151 }
152 if (!(flags & IRQ_FLG_REPLACE)) {
153 printk("%s: %s can't replace IRQ %d from %s\n",
154 __FUNCTION__, devname, irq, irq_list[irq].devname);
155 return -EBUSY;
156 }
157 }
158 #endif
159
160 irq_list[irq].handler = handler;
161 irq_list[irq].flags = flags;
162 irq_list[irq].dev_id = dev_id;
163 irq_list[irq].devname = devname;
164 return 0;
165 }
166
167 void sys_free_irq(unsigned int irq, void *dev_id)
168 {
169 if (irq < IRQ1 || irq > IRQ7) {
170 printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
171 return;
172 }
173
174 if (irq_list[irq].dev_id != dev_id)
175 printk("%s: Removing probably wrong IRQ %d from %s\n",
176 __FUNCTION__, irq, irq_list[irq].devname);
177
178 irq_list[irq].handler = (*mach_default_handler)[irq];
179 irq_list[irq].flags = 0;
180 irq_list[irq].dev_id = NULL;
181 irq_list[irq].devname = default_names[irq];
182 }
183
184 /*
185 * Do we need these probe functions on the m68k?
186 *
187 * ... may be useful with ISA devices
188 */
189 unsigned long probe_irq_on (void)
190 {
191 #ifdef CONFIG_Q40
192 if (MACH_IS_Q40)
193 return q40_probe_irq_on();
194 #endif
195 return 0;
196 }
197
198 int probe_irq_off (unsigned long irqs)
199 {
200 #ifdef CONFIG_Q40
201 if (MACH_IS_Q40)
202 return q40_probe_irq_off(irqs);
203 #endif
204 return 0;
205 }
206
207 static void dummy_enable_irq(unsigned int irq)
208 {
209 printk("calling uninitialized enable_irq()\n");
210 }
211
212 static void dummy_disable_irq(unsigned int irq)
213 {
214 printk("calling uninitialized disable_irq()\n");
215 }
216
217 static int dummy_request_irq(unsigned int irq,
218 void (*handler) (int, void *, struct pt_regs *),
219 unsigned long flags, const char *devname, void *dev_id)
220 {
221 printk("calling uninitialized request_irq()\n");
222 return 0;
223 }
224
225 static void dummy_free_irq(unsigned int irq, void *dev_id)
226 {
227 printk("calling uninitialized disable_irq()\n");
228 }
229
230 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
231 {
232 if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
233 vec -= VEC_SPUR;
234 kstat.irqs[0][vec]++;
235 irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
236 } else {
237 if (mach_process_int)
238 mach_process_int(vec, fp);
239 else
240 panic("Can't process interrupt vector %ld\n", vec);
241 return;
242 }
243 }
244
245 int get_irq_list(char *buf)
246 {
247 int i, len = 0;
248
249 /* autovector interrupts */
250 if (mach_default_handler) {
251 for (i = 0; i < SYS_IRQS; i++) {
252 len += sprintf(buf+len, "auto %2d: %10u ", i,
253 i ? kstat.irqs[0][i] : num_spurious);
254 len += sprintf(buf+len, " ");
255 len += sprintf(buf+len, "%s\n", irq_list[i].devname);
256 }
257 }
258
259 len += mach_get_irq_list(buf+len);
260 return len;
261 }
262
263 void init_irq_proc(void)
264 {
265 /* Insert /proc/irq driver here */
266 }
267
268