Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / powerpc / kernel / irq.c
1 /*
2  *  Derived from arch/i386/kernel/irq.c
3  *    Copyright (C) 1992 Linus Torvalds
4  *  Adapted from arch/i386 by Gary Thomas
5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6  *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
7  *    Copyright (C) 1996-2001 Cort Dougan
8  *  Adapted for Power Macintosh by Paul Mackerras
9  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
10  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License
14  * as published by the Free Software Foundation; either version
15  * 2 of the License, or (at your option) any later version.
16  *
17  * This file contains the code used by various IRQ handling routines:
18  * asking for different IRQ's should be done through these routines
19  * instead of just grabbing them. Thus setups with different IRQ numbers
20  * shouldn't result in any weird surprises, and installing new handlers
21  * should be easier.
22  *
23  * The MPC8xx has an interrupt mask in the SIU.  If a bit is set, the
24  * interrupt is _enabled_.  As expected, IRQ0 is bit 0 in the 32-bit
25  * mask register (of which only 16 are defined), hence the weird shifting
26  * and complement of the cached_irq_mask.  I want to be able to stuff
27  * this right into the SIU SMASK register.
28  * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
29  * to reduce code space and undefined function references.
30  */
31
32 #undef DEBUG
33
34 #include <linux/module.h>
35 #include <linux/threads.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/signal.h>
38 #include <linux/sched.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/interrupt.h>
42 #include <linux/timex.h>
43 #include <linux/init.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/irq.h>
47 #include <linux/seq_file.h>
48 #include <linux/cpumask.h>
49 #include <linux/profile.h>
50 #include <linux/bitops.h>
51 #include <linux/list.h>
52 #include <linux/radix-tree.h>
53 #include <linux/mutex.h>
54 #include <linux/bootmem.h>
55 #include <linux/pci.h>
56
57 #include <asm/uaccess.h>
58 #include <asm/system.h>
59 #include <asm/io.h>
60 #include <asm/pgtable.h>
61 #include <asm/irq.h>
62 #include <asm/cache.h>
63 #include <asm/prom.h>
64 #include <asm/ptrace.h>
65 #include <asm/machdep.h>
66 #include <asm/udbg.h>
67 #ifdef CONFIG_PPC64
68 #include <asm/paca.h>
69 #include <asm/firmware.h>
70 #include <asm/lv1call.h>
71 #endif
72
73 int __irq_offset_value;
74 static int ppc_spurious_interrupts;
75
76 #ifdef CONFIG_PPC32
77 EXPORT_SYMBOL(__irq_offset_value);
78 atomic_t ppc_n_lost_interrupts;
79
80 #ifndef CONFIG_PPC_MERGE
81 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
82 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
83 #endif
84
85 #ifdef CONFIG_TAU_INT
86 extern int tau_initialized;
87 extern int tau_interrupts(int);
88 #endif
89 #endif /* CONFIG_PPC32 */
90
91 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
92 extern atomic_t ipi_recv;
93 extern atomic_t ipi_sent;
94 #endif
95
96 #ifdef CONFIG_PPC64
97 EXPORT_SYMBOL(irq_desc);
98
99 int distribute_irqs = 1;
100
101 static inline unsigned long get_hard_enabled(void)
102 {
103         unsigned long enabled;
104
105         __asm__ __volatile__("lbz %0,%1(13)"
106         : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
107
108         return enabled;
109 }
110
111 static inline void set_soft_enabled(unsigned long enable)
112 {
113         __asm__ __volatile__("stb %0,%1(13)"
114         : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
115 }
116
117 void local_irq_restore(unsigned long en)
118 {
119         /*
120          * get_paca()->soft_enabled = en;
121          * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
122          * That was allowed before, and in such a case we do need to take care
123          * that gcc will set soft_enabled directly via r13, not choose to use
124          * an intermediate register, lest we're preempted to a different cpu.
125          */
126         set_soft_enabled(en);
127         if (!en)
128                 return;
129
130         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
131                 /*
132                  * Do we need to disable preemption here?  Not really: in the
133                  * unlikely event that we're preempted to a different cpu in
134                  * between getting r13, loading its lppaca_ptr, and loading
135                  * its any_int, we might call iseries_handle_interrupts without
136                  * an interrupt pending on the new cpu, but that's no disaster,
137                  * is it?  And the business of preempting us off the old cpu
138                  * would itself involve a local_irq_restore which handles the
139                  * interrupt to that cpu.
140                  *
141                  * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
142                  * to avoid any preemption checking added into get_paca().
143                  */
144                 if (local_paca->lppaca_ptr->int_dword.any_int)
145                         iseries_handle_interrupts();
146                 return;
147         }
148
149         /*
150          * if (get_paca()->hard_enabled) return;
151          * But again we need to take care that gcc gets hard_enabled directly
152          * via r13, not choose to use an intermediate register, lest we're
153          * preempted to a different cpu in between the two instructions.
154          */
155         if (get_hard_enabled())
156                 return;
157
158         /*
159          * Need to hard-enable interrupts here.  Since currently disabled,
160          * no need to take further asm precautions against preemption; but
161          * use local_paca instead of get_paca() to avoid preemption checking.
162          */
163         local_paca->hard_enabled = en;
164         if ((int)mfspr(SPRN_DEC) < 0)
165                 mtspr(SPRN_DEC, 1);
166
167         /*
168          * Force the delivery of pending soft-disabled interrupts on PS3.
169          * Any HV call will have this side effect.
170          */
171         if (firmware_has_feature(FW_FEATURE_PS3_LV1)) {
172                 u64 tmp;
173                 lv1_get_version_info(&tmp);
174         }
175
176         __hard_irq_enable();
177 }
178 #endif /* CONFIG_PPC64 */
179
180 int show_interrupts(struct seq_file *p, void *v)
181 {
182         int i = *(loff_t *)v, j;
183         struct irqaction *action;
184         irq_desc_t *desc;
185         unsigned long flags;
186
187         if (i == 0) {
188                 seq_puts(p, "           ");
189                 for_each_online_cpu(j)
190                         seq_printf(p, "CPU%d       ", j);
191                 seq_putc(p, '\n');
192         }
193
194         if (i < NR_IRQS) {
195                 desc = get_irq_desc(i);
196                 spin_lock_irqsave(&desc->lock, flags);
197                 action = desc->action;
198                 if (!action || !action->handler)
199                         goto skip;
200                 seq_printf(p, "%3d: ", i);
201 #ifdef CONFIG_SMP
202                 for_each_online_cpu(j)
203                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
204 #else
205                 seq_printf(p, "%10u ", kstat_irqs(i));
206 #endif /* CONFIG_SMP */
207                 if (desc->chip)
208                         seq_printf(p, " %s ", desc->chip->typename);
209                 else
210                         seq_puts(p, "  None      ");
211                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
212                 seq_printf(p, "    %s", action->name);
213                 for (action = action->next; action; action = action->next)
214                         seq_printf(p, ", %s", action->name);
215                 seq_putc(p, '\n');
216 skip:
217                 spin_unlock_irqrestore(&desc->lock, flags);
218         } else if (i == NR_IRQS) {
219 #ifdef CONFIG_PPC32
220 #ifdef CONFIG_TAU_INT
221                 if (tau_initialized){
222                         seq_puts(p, "TAU: ");
223                         for_each_online_cpu(j)
224                                 seq_printf(p, "%10u ", tau_interrupts(j));
225                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
226                 }
227 #endif
228 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
229                 /* should this be per processor send/receive? */
230                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
231                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
232 #endif
233 #endif /* CONFIG_PPC32 */
234                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
235         }
236         return 0;
237 }
238
239 #ifdef CONFIG_HOTPLUG_CPU
240 void fixup_irqs(cpumask_t map)
241 {
242         unsigned int irq;
243         static int warned;
244
245         for_each_irq(irq) {
246                 cpumask_t mask;
247
248                 if (irq_desc[irq].status & IRQ_PER_CPU)
249                         continue;
250
251                 cpus_and(mask, irq_desc[irq].affinity, map);
252                 if (any_online_cpu(mask) == NR_CPUS) {
253                         printk("Breaking affinity for irq %i\n", irq);
254                         mask = map;
255                 }
256                 if (irq_desc[irq].chip->set_affinity)
257                         irq_desc[irq].chip->set_affinity(irq, mask);
258                 else if (irq_desc[irq].action && !(warned++))
259                         printk("Cannot set affinity for irq %i\n", irq);
260         }
261
262         local_irq_enable();
263         mdelay(1);
264         local_irq_disable();
265 }
266 #endif
267
268 void do_IRQ(struct pt_regs *regs)
269 {
270         struct pt_regs *old_regs = set_irq_regs(regs);
271         unsigned int irq;
272 #ifdef CONFIG_IRQSTACKS
273         struct thread_info *curtp, *irqtp;
274 #endif
275
276         irq_enter();
277
278 #ifdef CONFIG_DEBUG_STACKOVERFLOW
279         /* Debugging check for stack overflow: is there less than 2KB free? */
280         {
281                 long sp;
282
283                 sp = __get_SP() & (THREAD_SIZE-1);
284
285                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
286                         printk("do_IRQ: stack overflow: %ld\n",
287                                 sp - sizeof(struct thread_info));
288                         dump_stack();
289                 }
290         }
291 #endif
292
293         /*
294          * Every platform is required to implement ppc_md.get_irq.
295          * This function will either return an irq number or NO_IRQ to
296          * indicate there are no more pending.
297          * The value NO_IRQ_IGNORE is for buggy hardware and means that this
298          * IRQ has already been handled. -- Tom
299          */
300         irq = ppc_md.get_irq();
301
302         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
303 #ifdef CONFIG_IRQSTACKS
304                 /* Switch to the irq stack to handle this */
305                 curtp = current_thread_info();
306                 irqtp = hardirq_ctx[smp_processor_id()];
307                 if (curtp != irqtp) {
308                         struct irq_desc *desc = irq_desc + irq;
309                         void *handler = desc->handle_irq;
310                         if (handler == NULL)
311                                 handler = &__do_IRQ;
312                         irqtp->task = curtp->task;
313                         irqtp->flags = 0;
314                         call_handle_irq(irq, desc, irqtp, handler);
315                         irqtp->task = NULL;
316                         if (irqtp->flags)
317                                 set_bits(irqtp->flags, &curtp->flags);
318                 } else
319 #endif
320                         generic_handle_irq(irq);
321         } else if (irq != NO_IRQ_IGNORE)
322                 /* That's not SMP safe ... but who cares ? */
323                 ppc_spurious_interrupts++;
324
325         irq_exit();
326         set_irq_regs(old_regs);
327
328 #ifdef CONFIG_PPC_ISERIES
329         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
330                         get_lppaca()->int_dword.fields.decr_int) {
331                 get_lppaca()->int_dword.fields.decr_int = 0;
332                 /* Signal a fake decrementer interrupt */
333                 timer_interrupt(regs);
334         }
335 #endif
336 }
337
338 void __init init_IRQ(void)
339 {
340         ppc_md.init_IRQ();
341 #ifdef CONFIG_PPC64
342         irq_ctx_init();
343 #endif
344 }
345
346
347 #ifdef CONFIG_IRQSTACKS
348 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
349 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
350
351 void irq_ctx_init(void)
352 {
353         struct thread_info *tp;
354         int i;
355
356         for_each_possible_cpu(i) {
357                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
358                 tp = softirq_ctx[i];
359                 tp->cpu = i;
360                 tp->preempt_count = SOFTIRQ_OFFSET;
361
362                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
363                 tp = hardirq_ctx[i];
364                 tp->cpu = i;
365                 tp->preempt_count = HARDIRQ_OFFSET;
366         }
367 }
368
369 static inline void do_softirq_onstack(void)
370 {
371         struct thread_info *curtp, *irqtp;
372
373         curtp = current_thread_info();
374         irqtp = softirq_ctx[smp_processor_id()];
375         irqtp->task = curtp->task;
376         call_do_softirq(irqtp);
377         irqtp->task = NULL;
378 }
379
380 #else
381 #define do_softirq_onstack()    __do_softirq()
382 #endif /* CONFIG_IRQSTACKS */
383
384 void do_softirq(void)
385 {
386         unsigned long flags;
387
388         if (in_interrupt())
389                 return;
390
391         local_irq_save(flags);
392
393         if (local_softirq_pending())
394                 do_softirq_onstack();
395
396         local_irq_restore(flags);
397 }
398 EXPORT_SYMBOL(do_softirq);
399
400
401 /*
402  * IRQ controller and virtual interrupts
403  */
404
405 #ifdef CONFIG_PPC_MERGE
406
407 static LIST_HEAD(irq_hosts);
408 static DEFINE_SPINLOCK(irq_big_lock);
409 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
410 static unsigned int irq_radix_writer;
411 struct irq_map_entry irq_map[NR_IRQS];
412 static unsigned int irq_virq_count = NR_IRQS;
413 static struct irq_host *irq_default_host;
414
415 irq_hw_number_t virq_to_hw(unsigned int virq)
416 {
417         return irq_map[virq].hwirq;
418 }
419 EXPORT_SYMBOL_GPL(virq_to_hw);
420
421 struct irq_host *irq_alloc_host(unsigned int revmap_type,
422                                 unsigned int revmap_arg,
423                                 struct irq_host_ops *ops,
424                                 irq_hw_number_t inval_irq)
425 {
426         struct irq_host *host;
427         unsigned int size = sizeof(struct irq_host);
428         unsigned int i;
429         unsigned int *rmap;
430         unsigned long flags;
431
432         /* Allocate structure and revmap table if using linear mapping */
433         if (revmap_type == IRQ_HOST_MAP_LINEAR)
434                 size += revmap_arg * sizeof(unsigned int);
435         if (mem_init_done)
436                 host = kzalloc(size, GFP_KERNEL);
437         else {
438                 host = alloc_bootmem(size);
439                 if (host)
440                         memset(host, 0, size);
441         }
442         if (host == NULL)
443                 return NULL;
444
445         /* Fill structure */
446         host->revmap_type = revmap_type;
447         host->inval_irq = inval_irq;
448         host->ops = ops;
449
450         spin_lock_irqsave(&irq_big_lock, flags);
451
452         /* If it's a legacy controller, check for duplicates and
453          * mark it as allocated (we use irq 0 host pointer for that
454          */
455         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
456                 if (irq_map[0].host != NULL) {
457                         spin_unlock_irqrestore(&irq_big_lock, flags);
458                         /* If we are early boot, we can't free the structure,
459                          * too bad...
460                          * this will be fixed once slab is made available early
461                          * instead of the current cruft
462                          */
463                         if (mem_init_done)
464                                 kfree(host);
465                         return NULL;
466                 }
467                 irq_map[0].host = host;
468         }
469
470         list_add(&host->link, &irq_hosts);
471         spin_unlock_irqrestore(&irq_big_lock, flags);
472
473         /* Additional setups per revmap type */
474         switch(revmap_type) {
475         case IRQ_HOST_MAP_LEGACY:
476                 /* 0 is always the invalid number for legacy */
477                 host->inval_irq = 0;
478                 /* setup us as the host for all legacy interrupts */
479                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
480                         irq_map[i].hwirq = 0;
481                         smp_wmb();
482                         irq_map[i].host = host;
483                         smp_wmb();
484
485                         /* Clear norequest flags */
486                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
487
488                         /* Legacy flags are left to default at this point,
489                          * one can then use irq_create_mapping() to
490                          * explicitely change them
491                          */
492                         ops->map(host, i, i);
493                 }
494                 break;
495         case IRQ_HOST_MAP_LINEAR:
496                 rmap = (unsigned int *)(host + 1);
497                 for (i = 0; i < revmap_arg; i++)
498                         rmap[i] = NO_IRQ;
499                 host->revmap_data.linear.size = revmap_arg;
500                 smp_wmb();
501                 host->revmap_data.linear.revmap = rmap;
502                 break;
503         default:
504                 break;
505         }
506
507         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
508
509         return host;
510 }
511
512 struct irq_host *irq_find_host(struct device_node *node)
513 {
514         struct irq_host *h, *found = NULL;
515         unsigned long flags;
516
517         /* We might want to match the legacy controller last since
518          * it might potentially be set to match all interrupts in
519          * the absence of a device node. This isn't a problem so far
520          * yet though...
521          */
522         spin_lock_irqsave(&irq_big_lock, flags);
523         list_for_each_entry(h, &irq_hosts, link)
524                 if (h->ops->match == NULL || h->ops->match(h, node)) {
525                         found = h;
526                         break;
527                 }
528         spin_unlock_irqrestore(&irq_big_lock, flags);
529         return found;
530 }
531 EXPORT_SYMBOL_GPL(irq_find_host);
532
533 void irq_set_default_host(struct irq_host *host)
534 {
535         pr_debug("irq: Default host set to @0x%p\n", host);
536
537         irq_default_host = host;
538 }
539
540 void irq_set_virq_count(unsigned int count)
541 {
542         pr_debug("irq: Trying to set virq count to %d\n", count);
543
544         BUG_ON(count < NUM_ISA_INTERRUPTS);
545         if (count < NR_IRQS)
546                 irq_virq_count = count;
547 }
548
549 /* radix tree not lockless safe ! we use a brlock-type mecanism
550  * for now, until we can use a lockless radix tree
551  */
552 static void irq_radix_wrlock(unsigned long *flags)
553 {
554         unsigned int cpu, ok;
555
556         spin_lock_irqsave(&irq_big_lock, *flags);
557         irq_radix_writer = 1;
558         smp_mb();
559         do {
560                 barrier();
561                 ok = 1;
562                 for_each_possible_cpu(cpu) {
563                         if (per_cpu(irq_radix_reader, cpu)) {
564                                 ok = 0;
565                                 break;
566                         }
567                 }
568                 if (!ok)
569                         cpu_relax();
570         } while(!ok);
571 }
572
573 static void irq_radix_wrunlock(unsigned long flags)
574 {
575         smp_wmb();
576         irq_radix_writer = 0;
577         spin_unlock_irqrestore(&irq_big_lock, flags);
578 }
579
580 static void irq_radix_rdlock(unsigned long *flags)
581 {
582         local_irq_save(*flags);
583         __get_cpu_var(irq_radix_reader) = 1;
584         smp_mb();
585         if (likely(irq_radix_writer == 0))
586                 return;
587         __get_cpu_var(irq_radix_reader) = 0;
588         smp_wmb();
589         spin_lock(&irq_big_lock);
590         __get_cpu_var(irq_radix_reader) = 1;
591         spin_unlock(&irq_big_lock);
592 }
593
594 static void irq_radix_rdunlock(unsigned long flags)
595 {
596         __get_cpu_var(irq_radix_reader) = 0;
597         local_irq_restore(flags);
598 }
599
600
601 unsigned int irq_create_mapping(struct irq_host *host,
602                                 irq_hw_number_t hwirq)
603 {
604         unsigned int virq, hint;
605
606         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
607
608         /* Look for default host if nececssary */
609         if (host == NULL)
610                 host = irq_default_host;
611         if (host == NULL) {
612                 printk(KERN_WARNING "irq_create_mapping called for"
613                        " NULL host, hwirq=%lx\n", hwirq);
614                 WARN_ON(1);
615                 return NO_IRQ;
616         }
617         pr_debug("irq: -> using host @%p\n", host);
618
619         /* Check if mapping already exist, if it does, call
620          * host->ops->map() to update the flags
621          */
622         virq = irq_find_mapping(host, hwirq);
623         if (virq != NO_IRQ) {
624                 if (host->ops->remap)
625                         host->ops->remap(host, virq, hwirq);
626                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
627                 return virq;
628         }
629
630         /* Get a virtual interrupt number */
631         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
632                 /* Handle legacy */
633                 virq = (unsigned int)hwirq;
634                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
635                         return NO_IRQ;
636                 return virq;
637         } else {
638                 /* Allocate a virtual interrupt number */
639                 hint = hwirq % irq_virq_count;
640                 virq = irq_alloc_virt(host, 1, hint);
641                 if (virq == NO_IRQ) {
642                         pr_debug("irq: -> virq allocation failed\n");
643                         return NO_IRQ;
644                 }
645         }
646         pr_debug("irq: -> obtained virq %d\n", virq);
647
648         /* Clear IRQ_NOREQUEST flag */
649         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
650
651         /* map it */
652         smp_wmb();
653         irq_map[virq].hwirq = hwirq;
654         smp_mb();
655         if (host->ops->map(host, virq, hwirq)) {
656                 pr_debug("irq: -> mapping failed, freeing\n");
657                 irq_free_virt(virq, 1);
658                 return NO_IRQ;
659         }
660         return virq;
661 }
662 EXPORT_SYMBOL_GPL(irq_create_mapping);
663
664 unsigned int irq_create_of_mapping(struct device_node *controller,
665                                    u32 *intspec, unsigned int intsize)
666 {
667         struct irq_host *host;
668         irq_hw_number_t hwirq;
669         unsigned int type = IRQ_TYPE_NONE;
670         unsigned int virq;
671
672         if (controller == NULL)
673                 host = irq_default_host;
674         else
675                 host = irq_find_host(controller);
676         if (host == NULL) {
677                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
678                        controller->full_name);
679                 return NO_IRQ;
680         }
681
682         /* If host has no translation, then we assume interrupt line */
683         if (host->ops->xlate == NULL)
684                 hwirq = intspec[0];
685         else {
686                 if (host->ops->xlate(host, controller, intspec, intsize,
687                                      &hwirq, &type))
688                         return NO_IRQ;
689         }
690
691         /* Create mapping */
692         virq = irq_create_mapping(host, hwirq);
693         if (virq == NO_IRQ)
694                 return virq;
695
696         /* Set type if specified and different than the current one */
697         if (type != IRQ_TYPE_NONE &&
698             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
699                 set_irq_type(virq, type);
700         return virq;
701 }
702 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
703
704 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
705 {
706         struct of_irq oirq;
707
708         if (of_irq_map_one(dev, index, &oirq))
709                 return NO_IRQ;
710
711         return irq_create_of_mapping(oirq.controller, oirq.specifier,
712                                      oirq.size);
713 }
714 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
715
716 void irq_dispose_mapping(unsigned int virq)
717 {
718         struct irq_host *host;
719         irq_hw_number_t hwirq;
720         unsigned long flags;
721
722         if (virq == NO_IRQ)
723                 return;
724
725         host = irq_map[virq].host;
726         WARN_ON (host == NULL);
727         if (host == NULL)
728                 return;
729
730         /* Never unmap legacy interrupts */
731         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
732                 return;
733
734         /* remove chip and handler */
735         set_irq_chip_and_handler(virq, NULL, NULL);
736
737         /* Make sure it's completed */
738         synchronize_irq(virq);
739
740         /* Tell the PIC about it */
741         if (host->ops->unmap)
742                 host->ops->unmap(host, virq);
743         smp_mb();
744
745         /* Clear reverse map */
746         hwirq = irq_map[virq].hwirq;
747         switch(host->revmap_type) {
748         case IRQ_HOST_MAP_LINEAR:
749                 if (hwirq < host->revmap_data.linear.size)
750                         host->revmap_data.linear.revmap[hwirq] = NO_IRQ;
751                 break;
752         case IRQ_HOST_MAP_TREE:
753                 /* Check if radix tree allocated yet */
754                 if (host->revmap_data.tree.gfp_mask == 0)
755                         break;
756                 irq_radix_wrlock(&flags);
757                 radix_tree_delete(&host->revmap_data.tree, hwirq);
758                 irq_radix_wrunlock(flags);
759                 break;
760         }
761
762         /* Destroy map */
763         smp_mb();
764         irq_map[virq].hwirq = host->inval_irq;
765
766         /* Set some flags */
767         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
768
769         /* Free it */
770         irq_free_virt(virq, 1);
771 }
772 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
773
774 unsigned int irq_find_mapping(struct irq_host *host,
775                               irq_hw_number_t hwirq)
776 {
777         unsigned int i;
778         unsigned int hint = hwirq % irq_virq_count;
779
780         /* Look for default host if nececssary */
781         if (host == NULL)
782                 host = irq_default_host;
783         if (host == NULL)
784                 return NO_IRQ;
785
786         /* legacy -> bail early */
787         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
788                 return hwirq;
789
790         /* Slow path does a linear search of the map */
791         if (hint < NUM_ISA_INTERRUPTS)
792                 hint = NUM_ISA_INTERRUPTS;
793         i = hint;
794         do  {
795                 if (irq_map[i].host == host &&
796                     irq_map[i].hwirq == hwirq)
797                         return i;
798                 i++;
799                 if (i >= irq_virq_count)
800                         i = NUM_ISA_INTERRUPTS;
801         } while(i != hint);
802         return NO_IRQ;
803 }
804 EXPORT_SYMBOL_GPL(irq_find_mapping);
805
806
807 unsigned int irq_radix_revmap(struct irq_host *host,
808                               irq_hw_number_t hwirq)
809 {
810         struct radix_tree_root *tree;
811         struct irq_map_entry *ptr;
812         unsigned int virq;
813         unsigned long flags;
814
815         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
816
817         /* Check if the radix tree exist yet. We test the value of
818          * the gfp_mask for that. Sneaky but saves another int in the
819          * structure. If not, we fallback to slow mode
820          */
821         tree = &host->revmap_data.tree;
822         if (tree->gfp_mask == 0)
823                 return irq_find_mapping(host, hwirq);
824
825         /* Now try to resolve */
826         irq_radix_rdlock(&flags);
827         ptr = radix_tree_lookup(tree, hwirq);
828         irq_radix_rdunlock(flags);
829
830         /* Found it, return */
831         if (ptr) {
832                 virq = ptr - irq_map;
833                 return virq;
834         }
835
836         /* If not there, try to insert it */
837         virq = irq_find_mapping(host, hwirq);
838         if (virq != NO_IRQ) {
839                 irq_radix_wrlock(&flags);
840                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
841                 irq_radix_wrunlock(flags);
842         }
843         return virq;
844 }
845
846 unsigned int irq_linear_revmap(struct irq_host *host,
847                                irq_hw_number_t hwirq)
848 {
849         unsigned int *revmap;
850
851         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
852
853         /* Check revmap bounds */
854         if (unlikely(hwirq >= host->revmap_data.linear.size))
855                 return irq_find_mapping(host, hwirq);
856
857         /* Check if revmap was allocated */
858         revmap = host->revmap_data.linear.revmap;
859         if (unlikely(revmap == NULL))
860                 return irq_find_mapping(host, hwirq);
861
862         /* Fill up revmap with slow path if no mapping found */
863         if (unlikely(revmap[hwirq] == NO_IRQ))
864                 revmap[hwirq] = irq_find_mapping(host, hwirq);
865
866         return revmap[hwirq];
867 }
868
869 unsigned int irq_alloc_virt(struct irq_host *host,
870                             unsigned int count,
871                             unsigned int hint)
872 {
873         unsigned long flags;
874         unsigned int i, j, found = NO_IRQ;
875
876         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
877                 return NO_IRQ;
878
879         spin_lock_irqsave(&irq_big_lock, flags);
880
881         /* Use hint for 1 interrupt if any */
882         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
883             hint < irq_virq_count && irq_map[hint].host == NULL) {
884                 found = hint;
885                 goto hint_found;
886         }
887
888         /* Look for count consecutive numbers in the allocatable
889          * (non-legacy) space
890          */
891         for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
892                 if (irq_map[i].host != NULL)
893                         j = 0;
894                 else
895                         j++;
896
897                 if (j == count) {
898                         found = i - count + 1;
899                         break;
900                 }
901         }
902         if (found == NO_IRQ) {
903                 spin_unlock_irqrestore(&irq_big_lock, flags);
904                 return NO_IRQ;
905         }
906  hint_found:
907         for (i = found; i < (found + count); i++) {
908                 irq_map[i].hwirq = host->inval_irq;
909                 smp_wmb();
910                 irq_map[i].host = host;
911         }
912         spin_unlock_irqrestore(&irq_big_lock, flags);
913         return found;
914 }
915
916 void irq_free_virt(unsigned int virq, unsigned int count)
917 {
918         unsigned long flags;
919         unsigned int i;
920
921         WARN_ON (virq < NUM_ISA_INTERRUPTS);
922         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
923
924         spin_lock_irqsave(&irq_big_lock, flags);
925         for (i = virq; i < (virq + count); i++) {
926                 struct irq_host *host;
927
928                 if (i < NUM_ISA_INTERRUPTS ||
929                     (virq + count) > irq_virq_count)
930                         continue;
931
932                 host = irq_map[i].host;
933                 irq_map[i].hwirq = host->inval_irq;
934                 smp_wmb();
935                 irq_map[i].host = NULL;
936         }
937         spin_unlock_irqrestore(&irq_big_lock, flags);
938 }
939
940 void irq_early_init(void)
941 {
942         unsigned int i;
943
944         for (i = 0; i < NR_IRQS; i++)
945                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
946 }
947
948 /* We need to create the radix trees late */
949 static int irq_late_init(void)
950 {
951         struct irq_host *h;
952         unsigned long flags;
953
954         irq_radix_wrlock(&flags);
955         list_for_each_entry(h, &irq_hosts, link) {
956                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
957                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
958         }
959         irq_radix_wrunlock(flags);
960
961         return 0;
962 }
963 arch_initcall(irq_late_init);
964
965 #endif /* CONFIG_PPC_MERGE */
966
967 #ifdef CONFIG_PPC64
968 static int __init setup_noirqdistrib(char *str)
969 {
970         distribute_irqs = 0;
971         return 1;
972 }
973
974 __setup("noirqdistrib", setup_noirqdistrib);
975 #endif /* CONFIG_PPC64 */