Commit | Line | Data |
---|---|---|
88278ca2 | 1 | /* |
1da177e4 | 2 | * arch/sparc/kernel/irq.c: Interrupt request handling routines. On the |
d1a78c32 | 3 | * Sparc the IRQs are basically 'cast in stone' |
1da177e4 LT |
4 | * and you are supposed to probe the prom's device |
5 | * node trees to find out who's got which IRQ. | |
6 | * | |
7 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
8 | * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
9 | * Copyright (C) 1995,2002 Pete A. Zaitcev (zaitcev@yahoo.com) | |
10 | * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk) | |
11 | * Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org) | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/sched.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/linkage.h> | |
19 | #include <linux/kernel_stat.h> | |
20 | #include <linux/signal.h> | |
1da177e4 LT |
21 | #include <linux/interrupt.h> |
22 | #include <linux/slab.h> | |
23 | #include <linux/random.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/smp.h> | |
1da177e4 LT |
26 | #include <linux/delay.h> |
27 | #include <linux/threads.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/seq_file.h> | |
30 | ||
31 | #include <asm/ptrace.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/system.h> | |
34 | #include <asm/psr.h> | |
35 | #include <asm/smp.h> | |
36 | #include <asm/vaddrs.h> | |
37 | #include <asm/timer.h> | |
38 | #include <asm/openprom.h> | |
39 | #include <asm/oplib.h> | |
40 | #include <asm/traps.h> | |
41 | #include <asm/irq.h> | |
42 | #include <asm/io.h> | |
43 | #include <asm/pgalloc.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/pcic.h> | |
46 | #include <asm/cacheflush.h> | |
0d84438d | 47 | #include <asm/irq_regs.h> |
0fd7ef1f | 48 | #include <asm/leon.h> |
1da177e4 | 49 | |
81265fd9 | 50 | #include "kernel.h" |
32231a66 AV |
51 | #include "irq.h" |
52 | ||
1da177e4 LT |
53 | #ifdef CONFIG_SMP |
54 | #define SMP_NOP2 "nop; nop;\n\t" | |
55 | #define SMP_NOP3 "nop; nop; nop;\n\t" | |
56 | #else | |
57 | #define SMP_NOP2 | |
58 | #define SMP_NOP3 | |
59 | #endif /* SMP */ | |
e8dd1612 | 60 | unsigned long __raw_local_irq_save(void) |
1da177e4 LT |
61 | { |
62 | unsigned long retval; | |
63 | unsigned long tmp; | |
64 | ||
65 | __asm__ __volatile__( | |
66 | "rd %%psr, %0\n\t" | |
67 | SMP_NOP3 /* Sun4m + Cypress + SMP bug */ | |
68 | "or %0, %2, %1\n\t" | |
69 | "wr %1, 0, %%psr\n\t" | |
70 | "nop; nop; nop\n" | |
71 | : "=&r" (retval), "=r" (tmp) | |
72 | : "i" (PSR_PIL) | |
73 | : "memory"); | |
74 | ||
75 | return retval; | |
76 | } | |
77 | ||
e8dd1612 | 78 | void raw_local_irq_enable(void) |
1da177e4 LT |
79 | { |
80 | unsigned long tmp; | |
81 | ||
82 | __asm__ __volatile__( | |
83 | "rd %%psr, %0\n\t" | |
84 | SMP_NOP3 /* Sun4m + Cypress + SMP bug */ | |
85 | "andn %0, %1, %0\n\t" | |
86 | "wr %0, 0, %%psr\n\t" | |
87 | "nop; nop; nop\n" | |
88 | : "=&r" (tmp) | |
89 | : "i" (PSR_PIL) | |
90 | : "memory"); | |
91 | } | |
92 | ||
e8dd1612 | 93 | void raw_local_irq_restore(unsigned long old_psr) |
1da177e4 LT |
94 | { |
95 | unsigned long tmp; | |
96 | ||
97 | __asm__ __volatile__( | |
98 | "rd %%psr, %0\n\t" | |
99 | "and %2, %1, %2\n\t" | |
100 | SMP_NOP2 /* Sun4m + Cypress + SMP bug */ | |
101 | "andn %0, %1, %0\n\t" | |
102 | "wr %0, %2, %%psr\n\t" | |
103 | "nop; nop; nop\n" | |
104 | : "=&r" (tmp) | |
105 | : "i" (PSR_PIL), "r" (old_psr) | |
106 | : "memory"); | |
107 | } | |
108 | ||
e8dd1612 RR |
109 | EXPORT_SYMBOL(__raw_local_irq_save); |
110 | EXPORT_SYMBOL(raw_local_irq_enable); | |
111 | EXPORT_SYMBOL(raw_local_irq_restore); | |
1da177e4 LT |
112 | |
113 | /* | |
114 | * Dave Redman (djhr@tadpole.co.uk) | |
115 | * | |
116 | * IRQ numbers.. These are no longer restricted to 15.. | |
117 | * | |
118 | * this is done to enable SBUS cards and onboard IO to be masked | |
119 | * correctly. using the interrupt level isn't good enough. | |
120 | * | |
121 | * For example: | |
122 | * A device interrupting at sbus level6 and the Floppy both come in | |
123 | * at IRQ11, but enabling and disabling them requires writing to | |
124 | * different bits in the SLAVIO/SEC. | |
125 | * | |
126 | * As a result of these changes sun4m machines could now support | |
127 | * directed CPU interrupts using the existing enable/disable irq code | |
128 | * with tweaks. | |
129 | * | |
130 | */ | |
131 | ||
132 | static void irq_panic(void) | |
133 | { | |
134 | extern char *cputypval; | |
135 | prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval); | |
136 | prom_halt(); | |
137 | } | |
138 | ||
40220c1a DH |
139 | void (*sparc_init_timers)(irq_handler_t ) = |
140 | (void (*)(irq_handler_t )) irq_panic; | |
1da177e4 LT |
141 | |
142 | /* | |
143 | * Dave Redman (djhr@tadpole.co.uk) | |
144 | * | |
145 | * There used to be extern calls and hard coded values here.. very sucky! | |
146 | * instead, because some of the devices attach very early, I do something | |
147 | * equally sucky but at least we'll never try to free statically allocated | |
148 | * space or call kmalloc before kmalloc_init :(. | |
149 | * | |
150 | * In fact it's the timer10 that attaches first.. then timer14 | |
151 | * then kmalloc_init is called.. then the tty interrupts attach. | |
152 | * hmmm.... | |
153 | * | |
154 | */ | |
155 | #define MAX_STATIC_ALLOC 4 | |
156 | struct irqaction static_irqaction[MAX_STATIC_ALLOC]; | |
157 | int static_irq_count; | |
158 | ||
c61c65cd | 159 | static struct { |
a54123e2 BB |
160 | struct irqaction *action; |
161 | int flags; | |
162 | } sparc_irq[NR_IRQS]; | |
163 | #define SPARC_IRQ_INPROGRESS 1 | |
1da177e4 LT |
164 | |
165 | /* Used to protect the IRQ action lists */ | |
166 | DEFINE_SPINLOCK(irq_action_lock); | |
167 | ||
168 | int show_interrupts(struct seq_file *p, void *v) | |
169 | { | |
170 | int i = *(loff_t *) v; | |
171 | struct irqaction * action; | |
172 | unsigned long flags; | |
173 | #ifdef CONFIG_SMP | |
174 | int j; | |
175 | #endif | |
176 | ||
177 | if (sparc_cpu_model == sun4d) { | |
178 | extern int show_sun4d_interrupts(struct seq_file *, void *); | |
179 | ||
180 | return show_sun4d_interrupts(p, v); | |
181 | } | |
182 | spin_lock_irqsave(&irq_action_lock, flags); | |
183 | if (i < NR_IRQS) { | |
a54123e2 | 184 | action = sparc_irq[i].action; |
1da177e4 LT |
185 | if (!action) |
186 | goto out_unlock; | |
187 | seq_printf(p, "%3d: ", i); | |
188 | #ifndef CONFIG_SMP | |
189 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
190 | #else | |
394e3902 AM |
191 | for_each_online_cpu(j) { |
192 | seq_printf(p, "%10u ", | |
a54123e2 | 193 | kstat_cpu(j).irqs[i]); |
1da177e4 LT |
194 | } |
195 | #endif | |
196 | seq_printf(p, " %c %s", | |
67413202 | 197 | (action->flags & IRQF_DISABLED) ? '+' : ' ', |
1da177e4 LT |
198 | action->name); |
199 | for (action=action->next; action; action = action->next) { | |
200 | seq_printf(p, ",%s %s", | |
67413202 | 201 | (action->flags & IRQF_DISABLED) ? " +" : "", |
1da177e4 LT |
202 | action->name); |
203 | } | |
204 | seq_putc(p, '\n'); | |
205 | } | |
206 | out_unlock: | |
207 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | void free_irq(unsigned int irq, void *dev_id) | |
212 | { | |
213 | struct irqaction * action; | |
a54123e2 | 214 | struct irqaction **actionp; |
1da177e4 LT |
215 | unsigned long flags; |
216 | unsigned int cpu_irq; | |
217 | ||
218 | if (sparc_cpu_model == sun4d) { | |
219 | extern void sun4d_free_irq(unsigned int, void *); | |
220 | ||
221 | sun4d_free_irq(irq, dev_id); | |
222 | return; | |
223 | } | |
224 | cpu_irq = irq & (NR_IRQS - 1); | |
225 | if (cpu_irq > 14) { /* 14 irq levels on the sparc */ | |
226 | printk("Trying to free bogus IRQ %d\n", irq); | |
227 | return; | |
228 | } | |
229 | ||
230 | spin_lock_irqsave(&irq_action_lock, flags); | |
231 | ||
a54123e2 BB |
232 | actionp = &sparc_irq[cpu_irq].action; |
233 | action = *actionp; | |
1da177e4 LT |
234 | |
235 | if (!action->handler) { | |
236 | printk("Trying to free free IRQ%d\n",irq); | |
237 | goto out_unlock; | |
238 | } | |
239 | if (dev_id) { | |
240 | for (; action; action = action->next) { | |
241 | if (action->dev_id == dev_id) | |
242 | break; | |
a54123e2 | 243 | actionp = &action->next; |
1da177e4 LT |
244 | } |
245 | if (!action) { | |
246 | printk("Trying to free free shared IRQ%d\n",irq); | |
247 | goto out_unlock; | |
248 | } | |
67413202 | 249 | } else if (action->flags & IRQF_SHARED) { |
1da177e4 LT |
250 | printk("Trying to free shared IRQ%d with NULL device ID\n", irq); |
251 | goto out_unlock; | |
252 | } | |
253 | if (action->flags & SA_STATIC_ALLOC) | |
254 | { | |
255 | /* This interrupt is marked as specially allocated | |
256 | * so it is a bad idea to free it. | |
257 | */ | |
258 | printk("Attempt to free statically allocated IRQ%d (%s)\n", | |
259 | irq, action->name); | |
260 | goto out_unlock; | |
261 | } | |
a54123e2 BB |
262 | |
263 | *actionp = action->next; | |
1da177e4 LT |
264 | |
265 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
266 | ||
267 | synchronize_irq(irq); | |
268 | ||
269 | spin_lock_irqsave(&irq_action_lock, flags); | |
270 | ||
271 | kfree(action); | |
272 | ||
a54123e2 | 273 | if (!sparc_irq[cpu_irq].action) |
0f516813 | 274 | __disable_irq(irq); |
1da177e4 LT |
275 | |
276 | out_unlock: | |
277 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
278 | } | |
279 | ||
280 | EXPORT_SYMBOL(free_irq); | |
281 | ||
282 | /* | |
283 | * This is called when we want to synchronize with | |
284 | * interrupts. We may for example tell a device to | |
285 | * stop sending interrupts: but to make sure there | |
286 | * are no interrupts that are executing on another | |
287 | * CPU we need to call this function. | |
288 | */ | |
289 | #ifdef CONFIG_SMP | |
290 | void synchronize_irq(unsigned int irq) | |
291 | { | |
a54123e2 BB |
292 | unsigned int cpu_irq; |
293 | ||
294 | cpu_irq = irq & (NR_IRQS - 1); | |
295 | while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS) | |
296 | cpu_relax(); | |
1da177e4 | 297 | } |
6943f3da | 298 | EXPORT_SYMBOL(synchronize_irq); |
1da177e4 LT |
299 | #endif /* SMP */ |
300 | ||
301 | void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs) | |
302 | { | |
303 | int i; | |
304 | struct irqaction * action; | |
305 | unsigned int cpu_irq; | |
306 | ||
307 | cpu_irq = irq & (NR_IRQS - 1); | |
a54123e2 | 308 | action = sparc_irq[cpu_irq].action; |
1da177e4 LT |
309 | |
310 | printk("IO device interrupt, irq = %d\n", irq); | |
311 | printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc, | |
312 | regs->npc, regs->u_regs[14]); | |
313 | if (action) { | |
314 | printk("Expecting: "); | |
315 | for (i = 0; i < 16; i++) | |
316 | if (action->handler) | |
317 | printk("[%s:%d:0x%x] ", action->name, | |
318 | (int) i, (unsigned int) action->handler); | |
319 | } | |
320 | printk("AIEEE\n"); | |
321 | panic("bogus interrupt received"); | |
322 | } | |
323 | ||
324 | void handler_irq(int irq, struct pt_regs * regs) | |
325 | { | |
0d84438d | 326 | struct pt_regs *old_regs; |
1da177e4 LT |
327 | struct irqaction * action; |
328 | int cpu = smp_processor_id(); | |
329 | #ifdef CONFIG_SMP | |
330 | extern void smp4m_irq_rotate(int cpu); | |
331 | #endif | |
332 | ||
0d84438d | 333 | old_regs = set_irq_regs(regs); |
1da177e4 LT |
334 | irq_enter(); |
335 | disable_pil_irq(irq); | |
336 | #ifdef CONFIG_SMP | |
d1a78c32 | 337 | /* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */ |
198c167c | 338 | if((sparc_cpu_model==sun4m) && (irq < 10)) |
1da177e4 LT |
339 | smp4m_irq_rotate(cpu); |
340 | #endif | |
a54123e2 BB |
341 | action = sparc_irq[irq].action; |
342 | sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS; | |
1da177e4 LT |
343 | kstat_cpu(cpu).irqs[irq]++; |
344 | do { | |
345 | if (!action || !action->handler) | |
346 | unexpected_irq(irq, NULL, regs); | |
0d84438d | 347 | action->handler(irq, action->dev_id); |
1da177e4 LT |
348 | action = action->next; |
349 | } while (action); | |
a54123e2 | 350 | sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS; |
1da177e4 LT |
351 | enable_pil_irq(irq); |
352 | irq_exit(); | |
0d84438d | 353 | set_irq_regs(old_regs); |
1da177e4 LT |
354 | } |
355 | ||
0a808a31 | 356 | #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE) |
1da177e4 | 357 | |
d1a78c32 | 358 | /* Fast IRQs on the Sparc can only have one routine attached to them, |
1da177e4 LT |
359 | * thus no sharing possible. |
360 | */ | |
0a808a31 DM |
361 | static int request_fast_irq(unsigned int irq, |
362 | void (*handler)(void), | |
363 | unsigned long irqflags, const char *devname) | |
1da177e4 LT |
364 | { |
365 | struct irqaction *action; | |
366 | unsigned long flags; | |
367 | unsigned int cpu_irq; | |
368 | int ret; | |
369 | #ifdef CONFIG_SMP | |
370 | struct tt_entry *trap_table; | |
371 | extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3; | |
372 | #endif | |
373 | ||
374 | cpu_irq = irq & (NR_IRQS - 1); | |
375 | if(cpu_irq > 14) { | |
376 | ret = -EINVAL; | |
377 | goto out; | |
378 | } | |
379 | if(!handler) { | |
380 | ret = -EINVAL; | |
381 | goto out; | |
382 | } | |
383 | ||
384 | spin_lock_irqsave(&irq_action_lock, flags); | |
385 | ||
a54123e2 | 386 | action = sparc_irq[cpu_irq].action; |
1da177e4 | 387 | if(action) { |
67413202 | 388 | if(action->flags & IRQF_SHARED) |
1da177e4 | 389 | panic("Trying to register fast irq when already shared.\n"); |
67413202 | 390 | if(irqflags & IRQF_SHARED) |
1da177e4 LT |
391 | panic("Trying to register fast irq as shared.\n"); |
392 | ||
393 | /* Anyway, someone already owns it so cannot be made fast. */ | |
394 | printk("request_fast_irq: Trying to register yet already owned.\n"); | |
395 | ret = -EBUSY; | |
396 | goto out_unlock; | |
397 | } | |
398 | ||
399 | /* If this is flagged as statically allocated then we use our | |
400 | * private struct which is never freed. | |
401 | */ | |
402 | if (irqflags & SA_STATIC_ALLOC) { | |
403 | if (static_irq_count < MAX_STATIC_ALLOC) | |
404 | action = &static_irqaction[static_irq_count++]; | |
405 | else | |
406 | printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", | |
407 | irq, devname); | |
408 | } | |
409 | ||
410 | if (action == NULL) | |
5cbded58 | 411 | action = kmalloc(sizeof(struct irqaction), |
1da177e4 LT |
412 | GFP_ATOMIC); |
413 | ||
414 | if (!action) { | |
415 | ret = -ENOMEM; | |
416 | goto out_unlock; | |
417 | } | |
418 | ||
419 | /* Dork with trap table if we get this far. */ | |
420 | #define INSTANTIATE(table) \ | |
421 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \ | |
422 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \ | |
423 | SPARC_BRANCH((unsigned long) handler, \ | |
424 | (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\ | |
425 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \ | |
426 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP; | |
427 | ||
428 | INSTANTIATE(sparc_ttable) | |
429 | #ifdef CONFIG_SMP | |
430 | trap_table = &trapbase_cpu1; INSTANTIATE(trap_table) | |
431 | trap_table = &trapbase_cpu2; INSTANTIATE(trap_table) | |
432 | trap_table = &trapbase_cpu3; INSTANTIATE(trap_table) | |
433 | #endif | |
434 | #undef INSTANTIATE | |
435 | /* | |
436 | * XXX Correct thing whould be to flush only I- and D-cache lines | |
437 | * which contain the handler in question. But as of time of the | |
438 | * writing we have no CPU-neutral interface to fine-grained flushes. | |
439 | */ | |
440 | flush_cache_all(); | |
441 | ||
1da177e4 | 442 | action->flags = irqflags; |
1da177e4 LT |
443 | action->name = devname; |
444 | action->dev_id = NULL; | |
445 | action->next = NULL; | |
446 | ||
a54123e2 | 447 | sparc_irq[cpu_irq].action = action; |
1da177e4 | 448 | |
0f516813 | 449 | __enable_irq(irq); |
1da177e4 LT |
450 | |
451 | ret = 0; | |
452 | out_unlock: | |
453 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
454 | out: | |
455 | return ret; | |
456 | } | |
457 | ||
0a808a31 DM |
458 | /* These variables are used to access state from the assembler |
459 | * interrupt handler, floppy_hardint, so we cannot put these in | |
460 | * the floppy driver image because that would not work in the | |
461 | * modular case. | |
462 | */ | |
463 | volatile unsigned char *fdc_status; | |
464 | EXPORT_SYMBOL(fdc_status); | |
465 | ||
466 | char *pdma_vaddr; | |
467 | EXPORT_SYMBOL(pdma_vaddr); | |
468 | ||
469 | unsigned long pdma_size; | |
470 | EXPORT_SYMBOL(pdma_size); | |
471 | ||
472 | volatile int doing_pdma; | |
473 | EXPORT_SYMBOL(doing_pdma); | |
474 | ||
475 | char *pdma_base; | |
476 | EXPORT_SYMBOL(pdma_base); | |
477 | ||
478 | unsigned long pdma_areasize; | |
479 | EXPORT_SYMBOL(pdma_areasize); | |
480 | ||
481 | extern void floppy_hardint(void); | |
482 | ||
7c239975 | 483 | static irq_handler_t floppy_irq_handler; |
0a808a31 DM |
484 | |
485 | void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs) | |
486 | { | |
487 | struct pt_regs *old_regs; | |
488 | int cpu = smp_processor_id(); | |
489 | ||
490 | old_regs = set_irq_regs(regs); | |
491 | disable_pil_irq(irq); | |
492 | irq_enter(); | |
493 | kstat_cpu(cpu).irqs[irq]++; | |
494 | floppy_irq_handler(irq, dev_id); | |
495 | irq_exit(); | |
496 | enable_pil_irq(irq); | |
497 | set_irq_regs(old_regs); | |
498 | // XXX Eek, it's totally changed with preempt_count() and such | |
499 | // if (softirq_pending(cpu)) | |
500 | // do_softirq(); | |
501 | } | |
502 | ||
503 | int sparc_floppy_request_irq(int irq, unsigned long flags, | |
7c239975 | 504 | irq_handler_t irq_handler) |
0a808a31 DM |
505 | { |
506 | floppy_irq_handler = irq_handler; | |
507 | return request_fast_irq(irq, floppy_hardint, flags, "floppy"); | |
508 | } | |
509 | EXPORT_SYMBOL(sparc_floppy_request_irq); | |
510 | ||
511 | #endif | |
512 | ||
1da177e4 | 513 | int request_irq(unsigned int irq, |
40220c1a | 514 | irq_handler_t handler, |
1da177e4 LT |
515 | unsigned long irqflags, const char * devname, void *dev_id) |
516 | { | |
a54123e2 | 517 | struct irqaction * action, **actionp; |
1da177e4 LT |
518 | unsigned long flags; |
519 | unsigned int cpu_irq; | |
520 | int ret; | |
521 | ||
522 | if (sparc_cpu_model == sun4d) { | |
523 | extern int sun4d_request_irq(unsigned int, | |
40220c1a | 524 | irq_handler_t , |
1da177e4 LT |
525 | unsigned long, const char *, void *); |
526 | return sun4d_request_irq(irq, handler, irqflags, devname, dev_id); | |
527 | } | |
528 | cpu_irq = irq & (NR_IRQS - 1); | |
529 | if(cpu_irq > 14) { | |
530 | ret = -EINVAL; | |
531 | goto out; | |
532 | } | |
533 | if (!handler) { | |
534 | ret = -EINVAL; | |
535 | goto out; | |
536 | } | |
537 | ||
538 | spin_lock_irqsave(&irq_action_lock, flags); | |
539 | ||
a54123e2 BB |
540 | actionp = &sparc_irq[cpu_irq].action; |
541 | action = *actionp; | |
1da177e4 | 542 | if (action) { |
67413202 | 543 | if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) { |
1da177e4 LT |
544 | ret = -EBUSY; |
545 | goto out_unlock; | |
546 | } | |
67413202 | 547 | if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) { |
1da177e4 LT |
548 | printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq); |
549 | ret = -EBUSY; | |
550 | goto out_unlock; | |
a54123e2 BB |
551 | } |
552 | for ( ; action; action = *actionp) | |
553 | actionp = &action->next; | |
1da177e4 LT |
554 | } |
555 | ||
556 | /* If this is flagged as statically allocated then we use our | |
557 | * private struct which is never freed. | |
558 | */ | |
559 | if (irqflags & SA_STATIC_ALLOC) { | |
560 | if (static_irq_count < MAX_STATIC_ALLOC) | |
561 | action = &static_irqaction[static_irq_count++]; | |
562 | else | |
563 | printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname); | |
564 | } | |
565 | ||
566 | if (action == NULL) | |
5cbded58 | 567 | action = kmalloc(sizeof(struct irqaction), |
1da177e4 LT |
568 | GFP_ATOMIC); |
569 | ||
570 | if (!action) { | |
571 | ret = -ENOMEM; | |
572 | goto out_unlock; | |
573 | } | |
574 | ||
575 | action->handler = handler; | |
576 | action->flags = irqflags; | |
1da177e4 LT |
577 | action->name = devname; |
578 | action->next = NULL; | |
579 | action->dev_id = dev_id; | |
580 | ||
a54123e2 | 581 | *actionp = action; |
1da177e4 | 582 | |
0f516813 | 583 | __enable_irq(irq); |
1da177e4 LT |
584 | |
585 | ret = 0; | |
586 | out_unlock: | |
587 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
588 | out: | |
589 | return ret; | |
590 | } | |
591 | ||
592 | EXPORT_SYMBOL(request_irq); | |
593 | ||
0f516813 AV |
594 | void disable_irq_nosync(unsigned int irq) |
595 | { | |
81265fd9 | 596 | __disable_irq(irq); |
0f516813 AV |
597 | } |
598 | EXPORT_SYMBOL(disable_irq_nosync); | |
599 | ||
600 | void disable_irq(unsigned int irq) | |
601 | { | |
81265fd9 | 602 | __disable_irq(irq); |
0f516813 AV |
603 | } |
604 | EXPORT_SYMBOL(disable_irq); | |
605 | ||
606 | void enable_irq(unsigned int irq) | |
607 | { | |
81265fd9 | 608 | __enable_irq(irq); |
0f516813 AV |
609 | } |
610 | ||
611 | EXPORT_SYMBOL(enable_irq); | |
612 | ||
1da177e4 LT |
613 | /* We really don't need these at all on the Sparc. We only have |
614 | * stubs here because they are exported to modules. | |
615 | */ | |
616 | unsigned long probe_irq_on(void) | |
617 | { | |
618 | return 0; | |
619 | } | |
620 | ||
621 | EXPORT_SYMBOL(probe_irq_on); | |
622 | ||
623 | int probe_irq_off(unsigned long mask) | |
624 | { | |
625 | return 0; | |
626 | } | |
627 | ||
628 | EXPORT_SYMBOL(probe_irq_off); | |
629 | ||
630 | /* djhr | |
631 | * This could probably be made indirect too and assigned in the CPU | |
632 | * bits of the code. That would be much nicer I think and would also | |
633 | * fit in with the idea of being able to tune your kernel for your machine | |
634 | * by removing unrequired machine and device support. | |
635 | * | |
636 | */ | |
637 | ||
638 | void __init init_IRQ(void) | |
639 | { | |
640 | extern void sun4c_init_IRQ( void ); | |
641 | extern void sun4m_init_IRQ( void ); | |
642 | extern void sun4d_init_IRQ( void ); | |
643 | ||
644 | switch(sparc_cpu_model) { | |
645 | case sun4c: | |
646 | case sun4: | |
647 | sun4c_init_IRQ(); | |
648 | break; | |
649 | ||
650 | case sun4m: | |
651 | #ifdef CONFIG_PCI | |
652 | pcic_probe(); | |
653 | if (pcic_present()) { | |
654 | sun4m_pci_init_IRQ(); | |
655 | break; | |
656 | } | |
657 | #endif | |
658 | sun4m_init_IRQ(); | |
659 | break; | |
660 | ||
661 | case sun4d: | |
662 | sun4d_init_IRQ(); | |
663 | break; | |
664 | ||
0fd7ef1f KE |
665 | case sparc_leon: |
666 | leon_init_IRQ(); | |
667 | break; | |
668 | ||
1da177e4 | 669 | default: |
d1a78c32 | 670 | prom_printf("Cannot initialize IRQs on this Sun machine..."); |
1da177e4 LT |
671 | break; |
672 | } | |
673 | btfixup(); | |
674 | } | |
675 | ||
4696b64d | 676 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
677 | void init_irq_proc(void) |
678 | { | |
679 | /* For now, nothing... */ | |
680 | } | |
4696b64d | 681 | #endif /* CONFIG_PROC_FS */ |