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Linux-2.6.12-rc2
[linux-2.6/next.git] / arch / m68knommu / platform / 68360 / ints.c
blobba184db1651b60daba705d4aaf56315ace42d145
1 /*
2 * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
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 * Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
9 * Copyright (c) 1996 Roman Zippel
10 * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
11 */
12
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/errno.h>
20
21 #include <asm/system.h>
22 #include <asm/irq.h>
23 #include <asm/traps.h>
24 #include <asm/io.h>
25 #include <asm/machdep.h>
26 #include <asm/setup.h>
27 #include <asm/m68360.h>
28
29 /* from quicc/commproc.c: */
30 extern QUICC *pquicc;
31 extern void cpm_interrupt_init(void);
32
33 #define INTERNAL_IRQS (96)
34
35 /* assembler routines */
36 asmlinkage void system_call(void);
37 asmlinkage void buserr(void);
38 asmlinkage void trap(void);
39 asmlinkage irqreturn_t bad_interrupt(void);
40 asmlinkage irqreturn_t inthandler(void);
41
42 extern void *_ramvec[];
43
44 /* The number of spurious interrupts */
45 volatile unsigned int num_spurious;
46 unsigned int local_irq_count[NR_CPUS];
47
48 /* irq node variables for the 32 (potential) on chip sources */
49 static irq_node_t int_irq_list[INTERNAL_IRQS];
50
51 static short int_irq_ablecount[INTERNAL_IRQS];
52
53 /*
54 * This function should be called during kernel startup to initialize
55 * IRQ handling routines.
56 */
57
58 void init_IRQ(void)
59 {
60 int i;
61 int vba = (CPM_VECTOR_BASE<<4);
62
63 /* set up the vectors */
64 _ramvec[2] = buserr;
65 _ramvec[3] = trap;
66 _ramvec[4] = trap;
67 _ramvec[5] = trap;
68 _ramvec[6] = trap;
69 _ramvec[7] = trap;
70 _ramvec[8] = trap;
71 _ramvec[9] = trap;
72 _ramvec[10] = trap;
73 _ramvec[11] = trap;
74 _ramvec[12] = trap;
75 _ramvec[13] = trap;
76 _ramvec[14] = trap;
77 _ramvec[15] = trap;
78
79 _ramvec[32] = system_call;
80 _ramvec[33] = trap;
81
82
83 cpm_interrupt_init();
84
85 /* set up CICR for vector base address and irq level */
86 /* irl = 4, hp = 1f - see MC68360UM p 7-377 */
87 pquicc->intr_cicr = 0x00e49f00 | vba;
88
89 /* CPM interrupt vectors: (p 7-376) */
90 _ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
91 _ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
92 _ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
93 _ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
94 _ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
95 _ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
96 _ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
97 _ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
98 _ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
99 _ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
100 _ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
101 _ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
102 _ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
103 _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* reserved */
104 _ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
105 _ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
106 _ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
107 _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
108 _ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
109 _ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
110 _ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
111 _ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
112 _ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
113 _ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
114 _ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
115 /* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; */ /* timer 1 */
116 _ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
117 _ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
118 _ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
119 _ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
120 _ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
121 _ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
122 _ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */
123
124
125 /* turn off all CPM interrupts */
126 pquicc->intr_cimr = 0x00000000;
127
128 /* initialize handlers */
129 for (i = 0; i < INTERNAL_IRQS; i++) {
130 int_irq_list[i].handler = NULL;
131 int_irq_list[i].flags = IRQ_FLG_STD;
132 int_irq_list[i].dev_id = NULL;
133 int_irq_list[i].devname = NULL;
134 }
135 }
136
137 #if 0
138 void M68360_insert_irq(irq_node_t **list, irq_node_t *node)
139 {
140 unsigned long flags;
141 irq_node_t *cur;
142
143 if (!node->dev_id)
144 printk(KERN_INFO "%s: Warning: dev_id of %s is zero\n",
145 __FUNCTION__, node->devname);
146
147 local_irq_save(flags);
148
149 cur = *list;
150
151 while (cur) {
152 list = &cur->next;
153 cur = cur->next;
154 }
155
156 node->next = cur;
157 *list = node;
158
159 local_irq_restore(flags);
160 }
161
162 void M68360_delete_irq(irq_node_t **list, void *dev_id)
163 {
164 unsigned long flags;
165 irq_node_t *node;
166
167 local_irq_save(flags);
168
169 for (node = *list; node; list = &node->next, node = *list) {
170 if (node->dev_id == dev_id) {
171 *list = node->next;
172 /* Mark it as free. */
173 node->handler = NULL;
174 local_irq_restore(flags);
175 return;
176 }
177 }
178 local_irq_restore(flags);
179 printk (KERN_INFO "%s: tried to remove invalid irq\n", __FUNCTION__);
180 }
181 #endif
182
183 int request_irq(
184 unsigned int irq,
185 irqreturn_t (*handler)(int, void *, struct pt_regs *),
186 unsigned long flags,
187 const char *devname,
188 void *dev_id)
189 {
190 int mask = (1<<irq);
191
192 irq += (CPM_VECTOR_BASE<<4);
193
194 if (irq >= INTERNAL_IRQS) {
195 printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
196 return -ENXIO;
197 }
198
199 if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
200 if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
201 printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
202 __FUNCTION__, irq, int_irq_list[irq].devname);
203 return -EBUSY;
204 }
205 if (flags & IRQ_FLG_REPLACE) {
206 printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
207 __FUNCTION__, devname, irq, int_irq_list[irq].devname);
208 return -EBUSY;
209 }
210 }
211 int_irq_list[irq].handler = handler;
212 int_irq_list[irq].flags = flags;
213 int_irq_list[irq].dev_id = dev_id;
214 int_irq_list[irq].devname = devname;
215
216 /* enable in the CIMR */
217 if (!int_irq_ablecount[irq])
218 pquicc->intr_cimr |= mask;
219 /* *(volatile unsigned long *)0xfffff304 &= ~(1<<irq); */
220
221 return 0;
222 }
223
224 EXPORT_SYMBOL(request_irq);
225
226 void free_irq(unsigned int irq, void *dev_id)
227 {
228 if (irq >= INTERNAL_IRQS) {
229 printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
230 return;
231 }
232
233 if (int_irq_list[irq].dev_id != dev_id)
234 printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
235 __FUNCTION__, irq, int_irq_list[irq].devname);
236 int_irq_list[irq].handler = NULL;
237 int_irq_list[irq].flags = IRQ_FLG_STD;
238 int_irq_list[irq].dev_id = NULL;
239 int_irq_list[irq].devname = NULL;
240
241 *(volatile unsigned long *)0xfffff304 |= 1<<irq;
242 }
243
244 EXPORT_SYMBOL(free_irq);
245
246 #if 0
247 /*
248 * Enable/disable a particular machine specific interrupt source.
249 * Note that this may affect other interrupts in case of a shared interrupt.
250 * This function should only be called for a _very_ short time to change some
251 * internal data, that may not be changed by the interrupt at the same time.
252 * int_(enable|disable)_irq calls may also be nested.
253 */
254 void M68360_enable_irq(unsigned int irq)
255 {
256 if (irq >= INTERNAL_IRQS) {
257 printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
258 return;
259 }
260
261 if (--int_irq_ablecount[irq])
262 return;
263
264 /* enable the interrupt */
265 *(volatile unsigned long *)0xfffff304 &= ~(1<<irq);
266 }
267
268 void M68360_disable_irq(unsigned int irq)
269 {
270 if (irq >= INTERNAL_IRQS) {
271 printk(KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
272 return;
273 }
274
275 if (int_irq_ablecount[irq]++)
276 return;
277
278 /* disable the interrupt */
279 *(volatile unsigned long *)0xfffff304 |= 1<<irq;
280 }
281 #endif
282
283 int show_interrupts(struct seq_file *p, void *v)
284 {
285 int i = *(loff_t *) v;
286
287 if (i < NR_IRQS) {
288 if (int_irq_list[i].devname) {
289 seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
290 if (int_irq_list[i].flags & IRQ_FLG_LOCK)
291 seq_printf(p, "L ");
292 else
293 seq_printf(p, " ");
294 seq_printf(p, "%s\n", int_irq_list[i].devname);
295 }
296 }
297 if (i == NR_IRQS)
298 seq_printf(p, " : %10u spurious\n", num_spurious);
299
300 return 0;
301 }
302
303 /* The 68k family did not have a good way to determine the source
304 * of interrupts until later in the family. The EC000 core does
305 * not provide the vector number on the stack, we vector everything
306 * into one vector and look in the blasted mask register...
307 * This code is designed to be fast, almost constant time, not clean!
308 */
309 void process_int(int vec, struct pt_regs *fp)
310 {
311 int irq;
312 int mask;
313
314 /* unsigned long pend = *(volatile unsigned long *)0xfffff30c; */
315
316 /* irq = vec + (CPM_VECTOR_BASE<<4); */
317 irq = vec;
318
319 /* unsigned long pend = *(volatile unsigned long *)pquicc->intr_cipr; */
320
321 /* Bugger all that weirdness. For the moment, I seem to know where I came from;
322 * vec is passed from a specific ISR, so I'll use it. */
323
324 if (int_irq_list[irq].handler) {
325 int_irq_list[irq].handler(irq , int_irq_list[irq].dev_id, fp);
326 kstat_cpu(0).irqs[irq]++;
327 pquicc->intr_cisr = (1 << vec); /* indicate that irq has been serviced */
328 } else {
329 printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the CIMR...\n", irq);
330 /* *(volatile unsigned long *)0xfffff304 |= mask; */
331 pquicc->intr_cimr &= ~(1 << vec);
332 num_spurious += 1;
333 }
334 return(IRQ_HANDLED);
335 }
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