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 */ | |
df9ee292 | 60 | unsigned long arch_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 | } | |
df9ee292 | 77 | EXPORT_SYMBOL(arch_local_irq_save); |
1da177e4 | 78 | |
df9ee292 | 79 | void arch_local_irq_enable(void) |
1da177e4 LT |
80 | { |
81 | unsigned long tmp; | |
82 | ||
83 | __asm__ __volatile__( | |
84 | "rd %%psr, %0\n\t" | |
85 | SMP_NOP3 /* Sun4m + Cypress + SMP bug */ | |
86 | "andn %0, %1, %0\n\t" | |
87 | "wr %0, 0, %%psr\n\t" | |
88 | "nop; nop; nop\n" | |
89 | : "=&r" (tmp) | |
90 | : "i" (PSR_PIL) | |
91 | : "memory"); | |
92 | } | |
df9ee292 | 93 | EXPORT_SYMBOL(arch_local_irq_enable); |
1da177e4 | 94 | |
df9ee292 | 95 | void arch_local_irq_restore(unsigned long old_psr) |
1da177e4 LT |
96 | { |
97 | unsigned long tmp; | |
98 | ||
99 | __asm__ __volatile__( | |
100 | "rd %%psr, %0\n\t" | |
101 | "and %2, %1, %2\n\t" | |
102 | SMP_NOP2 /* Sun4m + Cypress + SMP bug */ | |
103 | "andn %0, %1, %0\n\t" | |
104 | "wr %0, %2, %%psr\n\t" | |
105 | "nop; nop; nop\n" | |
106 | : "=&r" (tmp) | |
107 | : "i" (PSR_PIL), "r" (old_psr) | |
108 | : "memory"); | |
109 | } | |
df9ee292 | 110 | EXPORT_SYMBOL(arch_local_irq_restore); |
1da177e4 LT |
111 | |
112 | /* | |
113 | * Dave Redman (djhr@tadpole.co.uk) | |
114 | * | |
115 | * IRQ numbers.. These are no longer restricted to 15.. | |
116 | * | |
117 | * this is done to enable SBUS cards and onboard IO to be masked | |
118 | * correctly. using the interrupt level isn't good enough. | |
119 | * | |
120 | * For example: | |
121 | * A device interrupting at sbus level6 and the Floppy both come in | |
122 | * at IRQ11, but enabling and disabling them requires writing to | |
123 | * different bits in the SLAVIO/SEC. | |
124 | * | |
125 | * As a result of these changes sun4m machines could now support | |
126 | * directed CPU interrupts using the existing enable/disable irq code | |
127 | * with tweaks. | |
128 | * | |
129 | */ | |
130 | ||
131 | static void irq_panic(void) | |
132 | { | |
133 | extern char *cputypval; | |
134 | prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval); | |
135 | prom_halt(); | |
136 | } | |
137 | ||
40220c1a DH |
138 | void (*sparc_init_timers)(irq_handler_t ) = |
139 | (void (*)(irq_handler_t )) irq_panic; | |
1da177e4 LT |
140 | |
141 | /* | |
142 | * Dave Redman (djhr@tadpole.co.uk) | |
143 | * | |
144 | * There used to be extern calls and hard coded values here.. very sucky! | |
145 | * instead, because some of the devices attach very early, I do something | |
146 | * equally sucky but at least we'll never try to free statically allocated | |
147 | * space or call kmalloc before kmalloc_init :(. | |
148 | * | |
149 | * In fact it's the timer10 that attaches first.. then timer14 | |
150 | * then kmalloc_init is called.. then the tty interrupts attach. | |
151 | * hmmm.... | |
152 | * | |
153 | */ | |
154 | #define MAX_STATIC_ALLOC 4 | |
155 | struct irqaction static_irqaction[MAX_STATIC_ALLOC]; | |
156 | int static_irq_count; | |
157 | ||
c61c65cd | 158 | static struct { |
a54123e2 BB |
159 | struct irqaction *action; |
160 | int flags; | |
161 | } sparc_irq[NR_IRQS]; | |
162 | #define SPARC_IRQ_INPROGRESS 1 | |
1da177e4 LT |
163 | |
164 | /* Used to protect the IRQ action lists */ | |
165 | DEFINE_SPINLOCK(irq_action_lock); | |
166 | ||
167 | int show_interrupts(struct seq_file *p, void *v) | |
168 | { | |
169 | int i = *(loff_t *) v; | |
170 | struct irqaction * action; | |
171 | unsigned long flags; | |
172 | #ifdef CONFIG_SMP | |
173 | int j; | |
174 | #endif | |
175 | ||
176 | if (sparc_cpu_model == sun4d) { | |
177 | extern int show_sun4d_interrupts(struct seq_file *, void *); | |
178 | ||
179 | return show_sun4d_interrupts(p, v); | |
180 | } | |
181 | spin_lock_irqsave(&irq_action_lock, flags); | |
182 | if (i < NR_IRQS) { | |
a54123e2 | 183 | action = sparc_irq[i].action; |
1da177e4 LT |
184 | if (!action) |
185 | goto out_unlock; | |
186 | seq_printf(p, "%3d: ", i); | |
187 | #ifndef CONFIG_SMP | |
188 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
189 | #else | |
394e3902 AM |
190 | for_each_online_cpu(j) { |
191 | seq_printf(p, "%10u ", | |
a54123e2 | 192 | kstat_cpu(j).irqs[i]); |
1da177e4 LT |
193 | } |
194 | #endif | |
195 | seq_printf(p, " %c %s", | |
67413202 | 196 | (action->flags & IRQF_DISABLED) ? '+' : ' ', |
1da177e4 LT |
197 | action->name); |
198 | for (action=action->next; action; action = action->next) { | |
199 | seq_printf(p, ",%s %s", | |
67413202 | 200 | (action->flags & IRQF_DISABLED) ? " +" : "", |
1da177e4 LT |
201 | action->name); |
202 | } | |
203 | seq_putc(p, '\n'); | |
204 | } | |
205 | out_unlock: | |
206 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | void free_irq(unsigned int irq, void *dev_id) | |
211 | { | |
212 | struct irqaction * action; | |
a54123e2 | 213 | struct irqaction **actionp; |
1da177e4 LT |
214 | unsigned long flags; |
215 | unsigned int cpu_irq; | |
216 | ||
217 | if (sparc_cpu_model == sun4d) { | |
218 | extern void sun4d_free_irq(unsigned int, void *); | |
219 | ||
220 | sun4d_free_irq(irq, dev_id); | |
221 | return; | |
222 | } | |
223 | cpu_irq = irq & (NR_IRQS - 1); | |
224 | if (cpu_irq > 14) { /* 14 irq levels on the sparc */ | |
225 | printk("Trying to free bogus IRQ %d\n", irq); | |
226 | return; | |
227 | } | |
228 | ||
229 | spin_lock_irqsave(&irq_action_lock, flags); | |
230 | ||
a54123e2 BB |
231 | actionp = &sparc_irq[cpu_irq].action; |
232 | action = *actionp; | |
1da177e4 LT |
233 | |
234 | if (!action->handler) { | |
235 | printk("Trying to free free IRQ%d\n",irq); | |
236 | goto out_unlock; | |
237 | } | |
238 | if (dev_id) { | |
239 | for (; action; action = action->next) { | |
240 | if (action->dev_id == dev_id) | |
241 | break; | |
a54123e2 | 242 | actionp = &action->next; |
1da177e4 LT |
243 | } |
244 | if (!action) { | |
245 | printk("Trying to free free shared IRQ%d\n",irq); | |
246 | goto out_unlock; | |
247 | } | |
67413202 | 248 | } else if (action->flags & IRQF_SHARED) { |
1da177e4 LT |
249 | printk("Trying to free shared IRQ%d with NULL device ID\n", irq); |
250 | goto out_unlock; | |
251 | } | |
252 | if (action->flags & SA_STATIC_ALLOC) | |
253 | { | |
254 | /* This interrupt is marked as specially allocated | |
255 | * so it is a bad idea to free it. | |
256 | */ | |
257 | printk("Attempt to free statically allocated IRQ%d (%s)\n", | |
258 | irq, action->name); | |
259 | goto out_unlock; | |
260 | } | |
a54123e2 BB |
261 | |
262 | *actionp = action->next; | |
1da177e4 LT |
263 | |
264 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
265 | ||
266 | synchronize_irq(irq); | |
267 | ||
268 | spin_lock_irqsave(&irq_action_lock, flags); | |
269 | ||
270 | kfree(action); | |
271 | ||
a54123e2 | 272 | if (!sparc_irq[cpu_irq].action) |
0f516813 | 273 | __disable_irq(irq); |
1da177e4 LT |
274 | |
275 | out_unlock: | |
276 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
277 | } | |
278 | ||
279 | EXPORT_SYMBOL(free_irq); | |
280 | ||
281 | /* | |
282 | * This is called when we want to synchronize with | |
283 | * interrupts. We may for example tell a device to | |
284 | * stop sending interrupts: but to make sure there | |
285 | * are no interrupts that are executing on another | |
286 | * CPU we need to call this function. | |
287 | */ | |
288 | #ifdef CONFIG_SMP | |
289 | void synchronize_irq(unsigned int irq) | |
290 | { | |
a54123e2 BB |
291 | unsigned int cpu_irq; |
292 | ||
293 | cpu_irq = irq & (NR_IRQS - 1); | |
294 | while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS) | |
295 | cpu_relax(); | |
1da177e4 | 296 | } |
6943f3da | 297 | EXPORT_SYMBOL(synchronize_irq); |
1da177e4 LT |
298 | #endif /* SMP */ |
299 | ||
300 | void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs) | |
301 | { | |
302 | int i; | |
303 | struct irqaction * action; | |
304 | unsigned int cpu_irq; | |
305 | ||
306 | cpu_irq = irq & (NR_IRQS - 1); | |
a54123e2 | 307 | action = sparc_irq[cpu_irq].action; |
1da177e4 LT |
308 | |
309 | printk("IO device interrupt, irq = %d\n", irq); | |
310 | printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc, | |
311 | regs->npc, regs->u_regs[14]); | |
312 | if (action) { | |
313 | printk("Expecting: "); | |
314 | for (i = 0; i < 16; i++) | |
315 | if (action->handler) | |
316 | printk("[%s:%d:0x%x] ", action->name, | |
317 | (int) i, (unsigned int) action->handler); | |
318 | } | |
319 | printk("AIEEE\n"); | |
320 | panic("bogus interrupt received"); | |
321 | } | |
322 | ||
323 | void handler_irq(int irq, struct pt_regs * regs) | |
324 | { | |
0d84438d | 325 | struct pt_regs *old_regs; |
1da177e4 LT |
326 | struct irqaction * action; |
327 | int cpu = smp_processor_id(); | |
328 | #ifdef CONFIG_SMP | |
329 | extern void smp4m_irq_rotate(int cpu); | |
330 | #endif | |
331 | ||
0d84438d | 332 | old_regs = set_irq_regs(regs); |
1da177e4 LT |
333 | irq_enter(); |
334 | disable_pil_irq(irq); | |
335 | #ifdef CONFIG_SMP | |
d1a78c32 | 336 | /* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */ |
198c167c | 337 | if((sparc_cpu_model==sun4m) && (irq < 10)) |
1da177e4 LT |
338 | smp4m_irq_rotate(cpu); |
339 | #endif | |
a54123e2 BB |
340 | action = sparc_irq[irq].action; |
341 | sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS; | |
1da177e4 LT |
342 | kstat_cpu(cpu).irqs[irq]++; |
343 | do { | |
344 | if (!action || !action->handler) | |
345 | unexpected_irq(irq, NULL, regs); | |
0d84438d | 346 | action->handler(irq, action->dev_id); |
1da177e4 LT |
347 | action = action->next; |
348 | } while (action); | |
a54123e2 | 349 | sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS; |
1da177e4 LT |
350 | enable_pil_irq(irq); |
351 | irq_exit(); | |
0d84438d | 352 | set_irq_regs(old_regs); |
1da177e4 LT |
353 | } |
354 | ||
0a808a31 | 355 | #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE) |
1da177e4 | 356 | |
d1a78c32 | 357 | /* Fast IRQs on the Sparc can only have one routine attached to them, |
1da177e4 LT |
358 | * thus no sharing possible. |
359 | */ | |
0a808a31 DM |
360 | static int request_fast_irq(unsigned int irq, |
361 | void (*handler)(void), | |
362 | unsigned long irqflags, const char *devname) | |
1da177e4 LT |
363 | { |
364 | struct irqaction *action; | |
365 | unsigned long flags; | |
366 | unsigned int cpu_irq; | |
367 | int ret; | |
368 | #ifdef CONFIG_SMP | |
369 | struct tt_entry *trap_table; | |
370 | extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3; | |
371 | #endif | |
372 | ||
373 | cpu_irq = irq & (NR_IRQS - 1); | |
374 | if(cpu_irq > 14) { | |
375 | ret = -EINVAL; | |
376 | goto out; | |
377 | } | |
378 | if(!handler) { | |
379 | ret = -EINVAL; | |
380 | goto out; | |
381 | } | |
382 | ||
383 | spin_lock_irqsave(&irq_action_lock, flags); | |
384 | ||
a54123e2 | 385 | action = sparc_irq[cpu_irq].action; |
1da177e4 | 386 | if(action) { |
67413202 | 387 | if(action->flags & IRQF_SHARED) |
1da177e4 | 388 | panic("Trying to register fast irq when already shared.\n"); |
67413202 | 389 | if(irqflags & IRQF_SHARED) |
1da177e4 LT |
390 | panic("Trying to register fast irq as shared.\n"); |
391 | ||
392 | /* Anyway, someone already owns it so cannot be made fast. */ | |
393 | printk("request_fast_irq: Trying to register yet already owned.\n"); | |
394 | ret = -EBUSY; | |
395 | goto out_unlock; | |
396 | } | |
397 | ||
398 | /* If this is flagged as statically allocated then we use our | |
399 | * private struct which is never freed. | |
400 | */ | |
401 | if (irqflags & SA_STATIC_ALLOC) { | |
402 | if (static_irq_count < MAX_STATIC_ALLOC) | |
403 | action = &static_irqaction[static_irq_count++]; | |
404 | else | |
405 | printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", | |
406 | irq, devname); | |
407 | } | |
408 | ||
409 | if (action == NULL) | |
5cbded58 | 410 | action = kmalloc(sizeof(struct irqaction), |
1da177e4 LT |
411 | GFP_ATOMIC); |
412 | ||
413 | if (!action) { | |
414 | ret = -ENOMEM; | |
415 | goto out_unlock; | |
416 | } | |
417 | ||
418 | /* Dork with trap table if we get this far. */ | |
419 | #define INSTANTIATE(table) \ | |
420 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \ | |
421 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \ | |
422 | SPARC_BRANCH((unsigned long) handler, \ | |
423 | (unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\ | |
424 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \ | |
425 | table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP; | |
426 | ||
427 | INSTANTIATE(sparc_ttable) | |
428 | #ifdef CONFIG_SMP | |
429 | trap_table = &trapbase_cpu1; INSTANTIATE(trap_table) | |
430 | trap_table = &trapbase_cpu2; INSTANTIATE(trap_table) | |
431 | trap_table = &trapbase_cpu3; INSTANTIATE(trap_table) | |
432 | #endif | |
433 | #undef INSTANTIATE | |
434 | /* | |
435 | * XXX Correct thing whould be to flush only I- and D-cache lines | |
436 | * which contain the handler in question. But as of time of the | |
437 | * writing we have no CPU-neutral interface to fine-grained flushes. | |
438 | */ | |
439 | flush_cache_all(); | |
440 | ||
1da177e4 | 441 | action->flags = irqflags; |
1da177e4 LT |
442 | action->name = devname; |
443 | action->dev_id = NULL; | |
444 | action->next = NULL; | |
445 | ||
a54123e2 | 446 | sparc_irq[cpu_irq].action = action; |
1da177e4 | 447 | |
0f516813 | 448 | __enable_irq(irq); |
1da177e4 LT |
449 | |
450 | ret = 0; | |
451 | out_unlock: | |
452 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
453 | out: | |
454 | return ret; | |
455 | } | |
456 | ||
0a808a31 DM |
457 | /* These variables are used to access state from the assembler |
458 | * interrupt handler, floppy_hardint, so we cannot put these in | |
459 | * the floppy driver image because that would not work in the | |
460 | * modular case. | |
461 | */ | |
462 | volatile unsigned char *fdc_status; | |
463 | EXPORT_SYMBOL(fdc_status); | |
464 | ||
465 | char *pdma_vaddr; | |
466 | EXPORT_SYMBOL(pdma_vaddr); | |
467 | ||
468 | unsigned long pdma_size; | |
469 | EXPORT_SYMBOL(pdma_size); | |
470 | ||
471 | volatile int doing_pdma; | |
472 | EXPORT_SYMBOL(doing_pdma); | |
473 | ||
474 | char *pdma_base; | |
475 | EXPORT_SYMBOL(pdma_base); | |
476 | ||
477 | unsigned long pdma_areasize; | |
478 | EXPORT_SYMBOL(pdma_areasize); | |
479 | ||
480 | extern void floppy_hardint(void); | |
481 | ||
7c239975 | 482 | static irq_handler_t floppy_irq_handler; |
0a808a31 DM |
483 | |
484 | void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs) | |
485 | { | |
486 | struct pt_regs *old_regs; | |
487 | int cpu = smp_processor_id(); | |
488 | ||
489 | old_regs = set_irq_regs(regs); | |
490 | disable_pil_irq(irq); | |
491 | irq_enter(); | |
492 | kstat_cpu(cpu).irqs[irq]++; | |
493 | floppy_irq_handler(irq, dev_id); | |
494 | irq_exit(); | |
495 | enable_pil_irq(irq); | |
496 | set_irq_regs(old_regs); | |
497 | // XXX Eek, it's totally changed with preempt_count() and such | |
498 | // if (softirq_pending(cpu)) | |
499 | // do_softirq(); | |
500 | } | |
501 | ||
502 | int sparc_floppy_request_irq(int irq, unsigned long flags, | |
7c239975 | 503 | irq_handler_t irq_handler) |
0a808a31 DM |
504 | { |
505 | floppy_irq_handler = irq_handler; | |
506 | return request_fast_irq(irq, floppy_hardint, flags, "floppy"); | |
507 | } | |
508 | EXPORT_SYMBOL(sparc_floppy_request_irq); | |
509 | ||
510 | #endif | |
511 | ||
1da177e4 | 512 | int request_irq(unsigned int irq, |
40220c1a | 513 | irq_handler_t handler, |
1da177e4 LT |
514 | unsigned long irqflags, const char * devname, void *dev_id) |
515 | { | |
a54123e2 | 516 | struct irqaction * action, **actionp; |
1da177e4 LT |
517 | unsigned long flags; |
518 | unsigned int cpu_irq; | |
519 | int ret; | |
520 | ||
521 | if (sparc_cpu_model == sun4d) { | |
522 | extern int sun4d_request_irq(unsigned int, | |
40220c1a | 523 | irq_handler_t , |
1da177e4 LT |
524 | unsigned long, const char *, void *); |
525 | return sun4d_request_irq(irq, handler, irqflags, devname, dev_id); | |
526 | } | |
527 | cpu_irq = irq & (NR_IRQS - 1); | |
528 | if(cpu_irq > 14) { | |
529 | ret = -EINVAL; | |
530 | goto out; | |
531 | } | |
532 | if (!handler) { | |
533 | ret = -EINVAL; | |
534 | goto out; | |
535 | } | |
536 | ||
537 | spin_lock_irqsave(&irq_action_lock, flags); | |
538 | ||
a54123e2 BB |
539 | actionp = &sparc_irq[cpu_irq].action; |
540 | action = *actionp; | |
1da177e4 | 541 | if (action) { |
67413202 | 542 | if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) { |
1da177e4 LT |
543 | ret = -EBUSY; |
544 | goto out_unlock; | |
545 | } | |
67413202 | 546 | if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) { |
1da177e4 LT |
547 | printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq); |
548 | ret = -EBUSY; | |
549 | goto out_unlock; | |
a54123e2 BB |
550 | } |
551 | for ( ; action; action = *actionp) | |
552 | actionp = &action->next; | |
1da177e4 LT |
553 | } |
554 | ||
555 | /* If this is flagged as statically allocated then we use our | |
556 | * private struct which is never freed. | |
557 | */ | |
558 | if (irqflags & SA_STATIC_ALLOC) { | |
559 | if (static_irq_count < MAX_STATIC_ALLOC) | |
560 | action = &static_irqaction[static_irq_count++]; | |
561 | else | |
562 | printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname); | |
563 | } | |
564 | ||
565 | if (action == NULL) | |
5cbded58 | 566 | action = kmalloc(sizeof(struct irqaction), |
1da177e4 LT |
567 | GFP_ATOMIC); |
568 | ||
569 | if (!action) { | |
570 | ret = -ENOMEM; | |
571 | goto out_unlock; | |
572 | } | |
573 | ||
574 | action->handler = handler; | |
575 | action->flags = irqflags; | |
1da177e4 LT |
576 | action->name = devname; |
577 | action->next = NULL; | |
578 | action->dev_id = dev_id; | |
579 | ||
a54123e2 | 580 | *actionp = action; |
1da177e4 | 581 | |
0f516813 | 582 | __enable_irq(irq); |
1da177e4 LT |
583 | |
584 | ret = 0; | |
585 | out_unlock: | |
586 | spin_unlock_irqrestore(&irq_action_lock, flags); | |
587 | out: | |
588 | return ret; | |
589 | } | |
590 | ||
591 | EXPORT_SYMBOL(request_irq); | |
592 | ||
0f516813 AV |
593 | void disable_irq_nosync(unsigned int irq) |
594 | { | |
81265fd9 | 595 | __disable_irq(irq); |
0f516813 AV |
596 | } |
597 | EXPORT_SYMBOL(disable_irq_nosync); | |
598 | ||
599 | void disable_irq(unsigned int irq) | |
600 | { | |
81265fd9 | 601 | __disable_irq(irq); |
0f516813 AV |
602 | } |
603 | EXPORT_SYMBOL(disable_irq); | |
604 | ||
605 | void enable_irq(unsigned int irq) | |
606 | { | |
81265fd9 | 607 | __enable_irq(irq); |
0f516813 AV |
608 | } |
609 | ||
610 | EXPORT_SYMBOL(enable_irq); | |
611 | ||
1da177e4 LT |
612 | /* We really don't need these at all on the Sparc. We only have |
613 | * stubs here because they are exported to modules. | |
614 | */ | |
615 | unsigned long probe_irq_on(void) | |
616 | { | |
617 | return 0; | |
618 | } | |
619 | ||
620 | EXPORT_SYMBOL(probe_irq_on); | |
621 | ||
622 | int probe_irq_off(unsigned long mask) | |
623 | { | |
624 | return 0; | |
625 | } | |
626 | ||
627 | EXPORT_SYMBOL(probe_irq_off); | |
628 | ||
629 | /* djhr | |
630 | * This could probably be made indirect too and assigned in the CPU | |
631 | * bits of the code. That would be much nicer I think and would also | |
632 | * fit in with the idea of being able to tune your kernel for your machine | |
633 | * by removing unrequired machine and device support. | |
634 | * | |
635 | */ | |
636 | ||
637 | void __init init_IRQ(void) | |
638 | { | |
639 | extern void sun4c_init_IRQ( void ); | |
640 | extern void sun4m_init_IRQ( void ); | |
641 | extern void sun4d_init_IRQ( void ); | |
642 | ||
643 | switch(sparc_cpu_model) { | |
644 | case sun4c: | |
645 | case sun4: | |
646 | sun4c_init_IRQ(); | |
647 | break; | |
648 | ||
649 | case sun4m: | |
650 | #ifdef CONFIG_PCI | |
651 | pcic_probe(); | |
652 | if (pcic_present()) { | |
653 | sun4m_pci_init_IRQ(); | |
654 | break; | |
655 | } | |
656 | #endif | |
657 | sun4m_init_IRQ(); | |
658 | break; | |
659 | ||
660 | case sun4d: | |
661 | sun4d_init_IRQ(); | |
662 | break; | |
663 | ||
0fd7ef1f KE |
664 | case sparc_leon: |
665 | leon_init_IRQ(); | |
666 | break; | |
667 | ||
1da177e4 | 668 | default: |
d1a78c32 | 669 | prom_printf("Cannot initialize IRQs on this Sun machine..."); |
1da177e4 LT |
670 | break; |
671 | } | |
672 | btfixup(); | |
673 | } | |
674 | ||
4696b64d | 675 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
676 | void init_irq_proc(void) |
677 | { | |
678 | /* For now, nothing... */ | |
679 | } | |
4696b64d | 680 | #endif /* CONFIG_PROC_FS */ |