Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[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 #endif
71
72 int __irq_offset_value;
73 static int ppc_spurious_interrupts;
74
75 #ifdef CONFIG_PPC32
76 EXPORT_SYMBOL(__irq_offset_value);
77 atomic_t ppc_n_lost_interrupts;
78
79 #ifndef CONFIG_PPC_MERGE
80 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
81 unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
82 #endif
83
84 #ifdef CONFIG_TAU_INT
85 extern int tau_initialized;
86 extern int tau_interrupts(int);
87 #endif
88 #endif /* CONFIG_PPC32 */
89
90 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
91 extern atomic_t ipi_recv;
92 extern atomic_t ipi_sent;
93 #endif
94
95 #ifdef CONFIG_PPC64
96 EXPORT_SYMBOL(irq_desc);
97
98 int distribute_irqs = 1;
99
100 static inline unsigned long get_hard_enabled(void)
101 {
102         unsigned long enabled;
103
104         __asm__ __volatile__("lbz %0,%1(13)"
105         : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled)));
106
107         return enabled;
108 }
109
110 static inline void set_soft_enabled(unsigned long enable)
111 {
112         __asm__ __volatile__("stb %0,%1(13)"
113         : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled)));
114 }
115
116 void local_irq_restore(unsigned long en)
117 {
118         /*
119          * get_paca()->soft_enabled = en;
120          * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1?
121          * That was allowed before, and in such a case we do need to take care
122          * that gcc will set soft_enabled directly via r13, not choose to use
123          * an intermediate register, lest we're preempted to a different cpu.
124          */
125         set_soft_enabled(en);
126         if (!en)
127                 return;
128
129         if (firmware_has_feature(FW_FEATURE_ISERIES)) {
130                 /*
131                  * Do we need to disable preemption here?  Not really: in the
132                  * unlikely event that we're preempted to a different cpu in
133                  * between getting r13, loading its lppaca_ptr, and loading
134                  * its any_int, we might call iseries_handle_interrupts without
135                  * an interrupt pending on the new cpu, but that's no disaster,
136                  * is it?  And the business of preempting us off the old cpu
137                  * would itself involve a local_irq_restore which handles the
138                  * interrupt to that cpu.
139                  *
140                  * But use "local_paca->lppaca_ptr" instead of "get_lppaca()"
141                  * to avoid any preemption checking added into get_paca().
142                  */
143                 if (local_paca->lppaca_ptr->int_dword.any_int)
144                         iseries_handle_interrupts();
145                 return;
146         }
147
148         /*
149          * if (get_paca()->hard_enabled) return;
150          * But again we need to take care that gcc gets hard_enabled directly
151          * via r13, not choose to use an intermediate register, lest we're
152          * preempted to a different cpu in between the two instructions.
153          */
154         if (get_hard_enabled())
155                 return;
156
157         /*
158          * Need to hard-enable interrupts here.  Since currently disabled,
159          * no need to take further asm precautions against preemption; but
160          * use local_paca instead of get_paca() to avoid preemption checking.
161          */
162         local_paca->hard_enabled = en;
163         if ((int)mfspr(SPRN_DEC) < 0)
164                 mtspr(SPRN_DEC, 1);
165         hard_irq_enable();
166 }
167 #endif /* CONFIG_PPC64 */
168
169 int show_interrupts(struct seq_file *p, void *v)
170 {
171         int i = *(loff_t *)v, j;
172         struct irqaction *action;
173         irq_desc_t *desc;
174         unsigned long flags;
175
176         if (i == 0) {
177                 seq_puts(p, "           ");
178                 for_each_online_cpu(j)
179                         seq_printf(p, "CPU%d       ", j);
180                 seq_putc(p, '\n');
181         }
182
183         if (i < NR_IRQS) {
184                 desc = get_irq_desc(i);
185                 spin_lock_irqsave(&desc->lock, flags);
186                 action = desc->action;
187                 if (!action || !action->handler)
188                         goto skip;
189                 seq_printf(p, "%3d: ", i);
190 #ifdef CONFIG_SMP
191                 for_each_online_cpu(j)
192                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
193 #else
194                 seq_printf(p, "%10u ", kstat_irqs(i));
195 #endif /* CONFIG_SMP */
196                 if (desc->chip)
197                         seq_printf(p, " %s ", desc->chip->typename);
198                 else
199                         seq_puts(p, "  None      ");
200                 seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
201                 seq_printf(p, "    %s", action->name);
202                 for (action = action->next; action; action = action->next)
203                         seq_printf(p, ", %s", action->name);
204                 seq_putc(p, '\n');
205 skip:
206                 spin_unlock_irqrestore(&desc->lock, flags);
207         } else if (i == NR_IRQS) {
208 #ifdef CONFIG_PPC32
209 #ifdef CONFIG_TAU_INT
210                 if (tau_initialized){
211                         seq_puts(p, "TAU: ");
212                         for_each_online_cpu(j)
213                                 seq_printf(p, "%10u ", tau_interrupts(j));
214                         seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
215                 }
216 #endif
217 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
218                 /* should this be per processor send/receive? */
219                 seq_printf(p, "IPI (recv/sent): %10u/%u\n",
220                                 atomic_read(&ipi_recv), atomic_read(&ipi_sent));
221 #endif
222 #endif /* CONFIG_PPC32 */
223                 seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
224         }
225         return 0;
226 }
227
228 #ifdef CONFIG_HOTPLUG_CPU
229 void fixup_irqs(cpumask_t map)
230 {
231         unsigned int irq;
232         static int warned;
233
234         for_each_irq(irq) {
235                 cpumask_t mask;
236
237                 if (irq_desc[irq].status & IRQ_PER_CPU)
238                         continue;
239
240                 cpus_and(mask, irq_desc[irq].affinity, map);
241                 if (any_online_cpu(mask) == NR_CPUS) {
242                         printk("Breaking affinity for irq %i\n", irq);
243                         mask = map;
244                 }
245                 if (irq_desc[irq].chip->set_affinity)
246                         irq_desc[irq].chip->set_affinity(irq, mask);
247                 else if (irq_desc[irq].action && !(warned++))
248                         printk("Cannot set affinity for irq %i\n", irq);
249         }
250
251         local_irq_enable();
252         mdelay(1);
253         local_irq_disable();
254 }
255 #endif
256
257 void do_IRQ(struct pt_regs *regs)
258 {
259         struct pt_regs *old_regs = set_irq_regs(regs);
260         unsigned int irq;
261 #ifdef CONFIG_IRQSTACKS
262         struct thread_info *curtp, *irqtp;
263 #endif
264
265         irq_enter();
266
267 #ifdef CONFIG_DEBUG_STACKOVERFLOW
268         /* Debugging check for stack overflow: is there less than 2KB free? */
269         {
270                 long sp;
271
272                 sp = __get_SP() & (THREAD_SIZE-1);
273
274                 if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {
275                         printk("do_IRQ: stack overflow: %ld\n",
276                                 sp - sizeof(struct thread_info));
277                         dump_stack();
278                 }
279         }
280 #endif
281
282         /*
283          * Every platform is required to implement ppc_md.get_irq.
284          * This function will either return an irq number or NO_IRQ to
285          * indicate there are no more pending.
286          * The value NO_IRQ_IGNORE is for buggy hardware and means that this
287          * IRQ has already been handled. -- Tom
288          */
289         irq = ppc_md.get_irq();
290
291         if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) {
292 #ifdef CONFIG_IRQSTACKS
293                 /* Switch to the irq stack to handle this */
294                 curtp = current_thread_info();
295                 irqtp = hardirq_ctx[smp_processor_id()];
296                 if (curtp != irqtp) {
297                         struct irq_desc *desc = irq_desc + irq;
298                         void *handler = desc->handle_irq;
299                         if (handler == NULL)
300                                 handler = &__do_IRQ;
301                         irqtp->task = curtp->task;
302                         irqtp->flags = 0;
303                         call_handle_irq(irq, desc, irqtp, handler);
304                         irqtp->task = NULL;
305                         if (irqtp->flags)
306                                 set_bits(irqtp->flags, &curtp->flags);
307                 } else
308 #endif
309                         generic_handle_irq(irq);
310         } else if (irq != NO_IRQ_IGNORE)
311                 /* That's not SMP safe ... but who cares ? */
312                 ppc_spurious_interrupts++;
313
314         irq_exit();
315         set_irq_regs(old_regs);
316
317 #ifdef CONFIG_PPC_ISERIES
318         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
319                         get_lppaca()->int_dword.fields.decr_int) {
320                 get_lppaca()->int_dword.fields.decr_int = 0;
321                 /* Signal a fake decrementer interrupt */
322                 timer_interrupt(regs);
323         }
324 #endif
325 }
326
327 void __init init_IRQ(void)
328 {
329         ppc_md.init_IRQ();
330 #ifdef CONFIG_PPC64
331         irq_ctx_init();
332 #endif
333 }
334
335
336 #ifdef CONFIG_IRQSTACKS
337 struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;
338 struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly;
339
340 void irq_ctx_init(void)
341 {
342         struct thread_info *tp;
343         int i;
344
345         for_each_possible_cpu(i) {
346                 memset((void *)softirq_ctx[i], 0, THREAD_SIZE);
347                 tp = softirq_ctx[i];
348                 tp->cpu = i;
349                 tp->preempt_count = SOFTIRQ_OFFSET;
350
351                 memset((void *)hardirq_ctx[i], 0, THREAD_SIZE);
352                 tp = hardirq_ctx[i];
353                 tp->cpu = i;
354                 tp->preempt_count = HARDIRQ_OFFSET;
355         }
356 }
357
358 static inline void do_softirq_onstack(void)
359 {
360         struct thread_info *curtp, *irqtp;
361
362         curtp = current_thread_info();
363         irqtp = softirq_ctx[smp_processor_id()];
364         irqtp->task = curtp->task;
365         call_do_softirq(irqtp);
366         irqtp->task = NULL;
367 }
368
369 #else
370 #define do_softirq_onstack()    __do_softirq()
371 #endif /* CONFIG_IRQSTACKS */
372
373 void do_softirq(void)
374 {
375         unsigned long flags;
376
377         if (in_interrupt())
378                 return;
379
380         local_irq_save(flags);
381
382         if (local_softirq_pending())
383                 do_softirq_onstack();
384
385         local_irq_restore(flags);
386 }
387 EXPORT_SYMBOL(do_softirq);
388
389
390 /*
391  * IRQ controller and virtual interrupts
392  */
393
394 #ifdef CONFIG_PPC_MERGE
395
396 static LIST_HEAD(irq_hosts);
397 static DEFINE_SPINLOCK(irq_big_lock);
398 static DEFINE_PER_CPU(unsigned int, irq_radix_reader);
399 static unsigned int irq_radix_writer;
400 struct irq_map_entry irq_map[NR_IRQS];
401 static unsigned int irq_virq_count = NR_IRQS;
402 static struct irq_host *irq_default_host;
403
404 struct irq_host *irq_alloc_host(unsigned int revmap_type,
405                                 unsigned int revmap_arg,
406                                 struct irq_host_ops *ops,
407                                 irq_hw_number_t inval_irq)
408 {
409         struct irq_host *host;
410         unsigned int size = sizeof(struct irq_host);
411         unsigned int i;
412         unsigned int *rmap;
413         unsigned long flags;
414
415         /* Allocate structure and revmap table if using linear mapping */
416         if (revmap_type == IRQ_HOST_MAP_LINEAR)
417                 size += revmap_arg * sizeof(unsigned int);
418         if (mem_init_done)
419                 host = kzalloc(size, GFP_KERNEL);
420         else {
421                 host = alloc_bootmem(size);
422                 if (host)
423                         memset(host, 0, size);
424         }
425         if (host == NULL)
426                 return NULL;
427
428         /* Fill structure */
429         host->revmap_type = revmap_type;
430         host->inval_irq = inval_irq;
431         host->ops = ops;
432
433         spin_lock_irqsave(&irq_big_lock, flags);
434
435         /* If it's a legacy controller, check for duplicates and
436          * mark it as allocated (we use irq 0 host pointer for that
437          */
438         if (revmap_type == IRQ_HOST_MAP_LEGACY) {
439                 if (irq_map[0].host != NULL) {
440                         spin_unlock_irqrestore(&irq_big_lock, flags);
441                         /* If we are early boot, we can't free the structure,
442                          * too bad...
443                          * this will be fixed once slab is made available early
444                          * instead of the current cruft
445                          */
446                         if (mem_init_done)
447                                 kfree(host);
448                         return NULL;
449                 }
450                 irq_map[0].host = host;
451         }
452
453         list_add(&host->link, &irq_hosts);
454         spin_unlock_irqrestore(&irq_big_lock, flags);
455
456         /* Additional setups per revmap type */
457         switch(revmap_type) {
458         case IRQ_HOST_MAP_LEGACY:
459                 /* 0 is always the invalid number for legacy */
460                 host->inval_irq = 0;
461                 /* setup us as the host for all legacy interrupts */
462                 for (i = 1; i < NUM_ISA_INTERRUPTS; i++) {
463                         irq_map[i].hwirq = 0;
464                         smp_wmb();
465                         irq_map[i].host = host;
466                         smp_wmb();
467
468                         /* Clear norequest flags */
469                         get_irq_desc(i)->status &= ~IRQ_NOREQUEST;
470
471                         /* Legacy flags are left to default at this point,
472                          * one can then use irq_create_mapping() to
473                          * explicitely change them
474                          */
475                         ops->map(host, i, i);
476                 }
477                 break;
478         case IRQ_HOST_MAP_LINEAR:
479                 rmap = (unsigned int *)(host + 1);
480                 for (i = 0; i < revmap_arg; i++)
481                         rmap[i] = IRQ_NONE;
482                 host->revmap_data.linear.size = revmap_arg;
483                 smp_wmb();
484                 host->revmap_data.linear.revmap = rmap;
485                 break;
486         default:
487                 break;
488         }
489
490         pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host);
491
492         return host;
493 }
494
495 struct irq_host *irq_find_host(struct device_node *node)
496 {
497         struct irq_host *h, *found = NULL;
498         unsigned long flags;
499
500         /* We might want to match the legacy controller last since
501          * it might potentially be set to match all interrupts in
502          * the absence of a device node. This isn't a problem so far
503          * yet though...
504          */
505         spin_lock_irqsave(&irq_big_lock, flags);
506         list_for_each_entry(h, &irq_hosts, link)
507                 if (h->ops->match == NULL || h->ops->match(h, node)) {
508                         found = h;
509                         break;
510                 }
511         spin_unlock_irqrestore(&irq_big_lock, flags);
512         return found;
513 }
514 EXPORT_SYMBOL_GPL(irq_find_host);
515
516 void irq_set_default_host(struct irq_host *host)
517 {
518         pr_debug("irq: Default host set to @0x%p\n", host);
519
520         irq_default_host = host;
521 }
522
523 void irq_set_virq_count(unsigned int count)
524 {
525         pr_debug("irq: Trying to set virq count to %d\n", count);
526
527         BUG_ON(count < NUM_ISA_INTERRUPTS);
528         if (count < NR_IRQS)
529                 irq_virq_count = count;
530 }
531
532 /* radix tree not lockless safe ! we use a brlock-type mecanism
533  * for now, until we can use a lockless radix tree
534  */
535 static void irq_radix_wrlock(unsigned long *flags)
536 {
537         unsigned int cpu, ok;
538
539         spin_lock_irqsave(&irq_big_lock, *flags);
540         irq_radix_writer = 1;
541         smp_mb();
542         do {
543                 barrier();
544                 ok = 1;
545                 for_each_possible_cpu(cpu) {
546                         if (per_cpu(irq_radix_reader, cpu)) {
547                                 ok = 0;
548                                 break;
549                         }
550                 }
551                 if (!ok)
552                         cpu_relax();
553         } while(!ok);
554 }
555
556 static void irq_radix_wrunlock(unsigned long flags)
557 {
558         smp_wmb();
559         irq_radix_writer = 0;
560         spin_unlock_irqrestore(&irq_big_lock, flags);
561 }
562
563 static void irq_radix_rdlock(unsigned long *flags)
564 {
565         local_irq_save(*flags);
566         __get_cpu_var(irq_radix_reader) = 1;
567         smp_mb();
568         if (likely(irq_radix_writer == 0))
569                 return;
570         __get_cpu_var(irq_radix_reader) = 0;
571         smp_wmb();
572         spin_lock(&irq_big_lock);
573         __get_cpu_var(irq_radix_reader) = 1;
574         spin_unlock(&irq_big_lock);
575 }
576
577 static void irq_radix_rdunlock(unsigned long flags)
578 {
579         __get_cpu_var(irq_radix_reader) = 0;
580         local_irq_restore(flags);
581 }
582
583
584 unsigned int irq_create_mapping(struct irq_host *host,
585                                 irq_hw_number_t hwirq)
586 {
587         unsigned int virq, hint;
588
589         pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
590
591         /* Look for default host if nececssary */
592         if (host == NULL)
593                 host = irq_default_host;
594         if (host == NULL) {
595                 printk(KERN_WARNING "irq_create_mapping called for"
596                        " NULL host, hwirq=%lx\n", hwirq);
597                 WARN_ON(1);
598                 return NO_IRQ;
599         }
600         pr_debug("irq: -> using host @%p\n", host);
601
602         /* Check if mapping already exist, if it does, call
603          * host->ops->map() to update the flags
604          */
605         virq = irq_find_mapping(host, hwirq);
606         if (virq != IRQ_NONE) {
607                 if (host->ops->remap)
608                         host->ops->remap(host, virq, hwirq);
609                 pr_debug("irq: -> existing mapping on virq %d\n", virq);
610                 return virq;
611         }
612
613         /* Get a virtual interrupt number */
614         if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {
615                 /* Handle legacy */
616                 virq = (unsigned int)hwirq;
617                 if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
618                         return NO_IRQ;
619                 return virq;
620         } else {
621                 /* Allocate a virtual interrupt number */
622                 hint = hwirq % irq_virq_count;
623                 virq = irq_alloc_virt(host, 1, hint);
624                 if (virq == NO_IRQ) {
625                         pr_debug("irq: -> virq allocation failed\n");
626                         return NO_IRQ;
627                 }
628         }
629         pr_debug("irq: -> obtained virq %d\n", virq);
630
631         /* Clear IRQ_NOREQUEST flag */
632         get_irq_desc(virq)->status &= ~IRQ_NOREQUEST;
633
634         /* map it */
635         smp_wmb();
636         irq_map[virq].hwirq = hwirq;
637         smp_mb();
638         if (host->ops->map(host, virq, hwirq)) {
639                 pr_debug("irq: -> mapping failed, freeing\n");
640                 irq_free_virt(virq, 1);
641                 return NO_IRQ;
642         }
643         return virq;
644 }
645 EXPORT_SYMBOL_GPL(irq_create_mapping);
646
647 unsigned int irq_create_of_mapping(struct device_node *controller,
648                                    u32 *intspec, unsigned int intsize)
649 {
650         struct irq_host *host;
651         irq_hw_number_t hwirq;
652         unsigned int type = IRQ_TYPE_NONE;
653         unsigned int virq;
654
655         if (controller == NULL)
656                 host = irq_default_host;
657         else
658                 host = irq_find_host(controller);
659         if (host == NULL) {
660                 printk(KERN_WARNING "irq: no irq host found for %s !\n",
661                        controller->full_name);
662                 return NO_IRQ;
663         }
664
665         /* If host has no translation, then we assume interrupt line */
666         if (host->ops->xlate == NULL)
667                 hwirq = intspec[0];
668         else {
669                 if (host->ops->xlate(host, controller, intspec, intsize,
670                                      &hwirq, &type))
671                         return NO_IRQ;
672         }
673
674         /* Create mapping */
675         virq = irq_create_mapping(host, hwirq);
676         if (virq == NO_IRQ)
677                 return virq;
678
679         /* Set type if specified and different than the current one */
680         if (type != IRQ_TYPE_NONE &&
681             type != (get_irq_desc(virq)->status & IRQF_TRIGGER_MASK))
682                 set_irq_type(virq, type);
683         return virq;
684 }
685 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
686
687 unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
688 {
689         struct of_irq oirq;
690
691         if (of_irq_map_one(dev, index, &oirq))
692                 return NO_IRQ;
693
694         return irq_create_of_mapping(oirq.controller, oirq.specifier,
695                                      oirq.size);
696 }
697 EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
698
699 void irq_dispose_mapping(unsigned int virq)
700 {
701         struct irq_host *host;
702         irq_hw_number_t hwirq;
703         unsigned long flags;
704
705         if (virq == NO_IRQ)
706                 return;
707
708         host = irq_map[virq].host;
709         WARN_ON (host == NULL);
710         if (host == NULL)
711                 return;
712
713         /* Never unmap legacy interrupts */
714         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
715                 return;
716
717         /* remove chip and handler */
718         set_irq_chip_and_handler(virq, NULL, NULL);
719
720         /* Make sure it's completed */
721         synchronize_irq(virq);
722
723         /* Tell the PIC about it */
724         if (host->ops->unmap)
725                 host->ops->unmap(host, virq);
726         smp_mb();
727
728         /* Clear reverse map */
729         hwirq = irq_map[virq].hwirq;
730         switch(host->revmap_type) {
731         case IRQ_HOST_MAP_LINEAR:
732                 if (hwirq < host->revmap_data.linear.size)
733                         host->revmap_data.linear.revmap[hwirq] = IRQ_NONE;
734                 break;
735         case IRQ_HOST_MAP_TREE:
736                 /* Check if radix tree allocated yet */
737                 if (host->revmap_data.tree.gfp_mask == 0)
738                         break;
739                 irq_radix_wrlock(&flags);
740                 radix_tree_delete(&host->revmap_data.tree, hwirq);
741                 irq_radix_wrunlock(flags);
742                 break;
743         }
744
745         /* Destroy map */
746         smp_mb();
747         irq_map[virq].hwirq = host->inval_irq;
748
749         /* Set some flags */
750         get_irq_desc(virq)->status |= IRQ_NOREQUEST;
751
752         /* Free it */
753         irq_free_virt(virq, 1);
754 }
755 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
756
757 unsigned int irq_find_mapping(struct irq_host *host,
758                               irq_hw_number_t hwirq)
759 {
760         unsigned int i;
761         unsigned int hint = hwirq % irq_virq_count;
762
763         /* Look for default host if nececssary */
764         if (host == NULL)
765                 host = irq_default_host;
766         if (host == NULL)
767                 return NO_IRQ;
768
769         /* legacy -> bail early */
770         if (host->revmap_type == IRQ_HOST_MAP_LEGACY)
771                 return hwirq;
772
773         /* Slow path does a linear search of the map */
774         if (hint < NUM_ISA_INTERRUPTS)
775                 hint = NUM_ISA_INTERRUPTS;
776         i = hint;
777         do  {
778                 if (irq_map[i].host == host &&
779                     irq_map[i].hwirq == hwirq)
780                         return i;
781                 i++;
782                 if (i >= irq_virq_count)
783                         i = NUM_ISA_INTERRUPTS;
784         } while(i != hint);
785         return NO_IRQ;
786 }
787 EXPORT_SYMBOL_GPL(irq_find_mapping);
788
789
790 unsigned int irq_radix_revmap(struct irq_host *host,
791                               irq_hw_number_t hwirq)
792 {
793         struct radix_tree_root *tree;
794         struct irq_map_entry *ptr;
795         unsigned int virq;
796         unsigned long flags;
797
798         WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
799
800         /* Check if the radix tree exist yet. We test the value of
801          * the gfp_mask for that. Sneaky but saves another int in the
802          * structure. If not, we fallback to slow mode
803          */
804         tree = &host->revmap_data.tree;
805         if (tree->gfp_mask == 0)
806                 return irq_find_mapping(host, hwirq);
807
808         /* Now try to resolve */
809         irq_radix_rdlock(&flags);
810         ptr = radix_tree_lookup(tree, hwirq);
811         irq_radix_rdunlock(flags);
812
813         /* Found it, return */
814         if (ptr) {
815                 virq = ptr - irq_map;
816                 return virq;
817         }
818
819         /* If not there, try to insert it */
820         virq = irq_find_mapping(host, hwirq);
821         if (virq != NO_IRQ) {
822                 irq_radix_wrlock(&flags);
823                 radix_tree_insert(tree, hwirq, &irq_map[virq]);
824                 irq_radix_wrunlock(flags);
825         }
826         return virq;
827 }
828
829 unsigned int irq_linear_revmap(struct irq_host *host,
830                                irq_hw_number_t hwirq)
831 {
832         unsigned int *revmap;
833
834         WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR);
835
836         /* Check revmap bounds */
837         if (unlikely(hwirq >= host->revmap_data.linear.size))
838                 return irq_find_mapping(host, hwirq);
839
840         /* Check if revmap was allocated */
841         revmap = host->revmap_data.linear.revmap;
842         if (unlikely(revmap == NULL))
843                 return irq_find_mapping(host, hwirq);
844
845         /* Fill up revmap with slow path if no mapping found */
846         if (unlikely(revmap[hwirq] == NO_IRQ))
847                 revmap[hwirq] = irq_find_mapping(host, hwirq);
848
849         return revmap[hwirq];
850 }
851
852 unsigned int irq_alloc_virt(struct irq_host *host,
853                             unsigned int count,
854                             unsigned int hint)
855 {
856         unsigned long flags;
857         unsigned int i, j, found = NO_IRQ;
858
859         if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
860                 return NO_IRQ;
861
862         spin_lock_irqsave(&irq_big_lock, flags);
863
864         /* Use hint for 1 interrupt if any */
865         if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
866             hint < irq_virq_count && irq_map[hint].host == NULL) {
867                 found = hint;
868                 goto hint_found;
869         }
870
871         /* Look for count consecutive numbers in the allocatable
872          * (non-legacy) space
873          */
874         for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
875                 if (irq_map[i].host != NULL)
876                         j = 0;
877                 else
878                         j++;
879
880                 if (j == count) {
881                         found = i - count + 1;
882                         break;
883                 }
884         }
885         if (found == NO_IRQ) {
886                 spin_unlock_irqrestore(&irq_big_lock, flags);
887                 return NO_IRQ;
888         }
889  hint_found:
890         for (i = found; i < (found + count); i++) {
891                 irq_map[i].hwirq = host->inval_irq;
892                 smp_wmb();
893                 irq_map[i].host = host;
894         }
895         spin_unlock_irqrestore(&irq_big_lock, flags);
896         return found;
897 }
898
899 void irq_free_virt(unsigned int virq, unsigned int count)
900 {
901         unsigned long flags;
902         unsigned int i;
903
904         WARN_ON (virq < NUM_ISA_INTERRUPTS);
905         WARN_ON (count == 0 || (virq + count) > irq_virq_count);
906
907         spin_lock_irqsave(&irq_big_lock, flags);
908         for (i = virq; i < (virq + count); i++) {
909                 struct irq_host *host;
910
911                 if (i < NUM_ISA_INTERRUPTS ||
912                     (virq + count) > irq_virq_count)
913                         continue;
914
915                 host = irq_map[i].host;
916                 irq_map[i].hwirq = host->inval_irq;
917                 smp_wmb();
918                 irq_map[i].host = NULL;
919         }
920         spin_unlock_irqrestore(&irq_big_lock, flags);
921 }
922
923 void irq_early_init(void)
924 {
925         unsigned int i;
926
927         for (i = 0; i < NR_IRQS; i++)
928                 get_irq_desc(i)->status |= IRQ_NOREQUEST;
929 }
930
931 /* We need to create the radix trees late */
932 static int irq_late_init(void)
933 {
934         struct irq_host *h;
935         unsigned long flags;
936
937         irq_radix_wrlock(&flags);
938         list_for_each_entry(h, &irq_hosts, link) {
939                 if (h->revmap_type == IRQ_HOST_MAP_TREE)
940                         INIT_RADIX_TREE(&h->revmap_data.tree, GFP_ATOMIC);
941         }
942         irq_radix_wrunlock(flags);
943
944         return 0;
945 }
946 arch_initcall(irq_late_init);
947
948 #endif /* CONFIG_PPC_MERGE */
949
950 #ifdef CONFIG_PCI_MSI
951 int pci_enable_msi(struct pci_dev * pdev)
952 {
953         if (ppc_md.enable_msi)
954                 return ppc_md.enable_msi(pdev);
955         else
956                 return -1;
957 }
958 EXPORT_SYMBOL(pci_enable_msi);
959
960 void pci_disable_msi(struct pci_dev * pdev)
961 {
962         if (ppc_md.disable_msi)
963                 ppc_md.disable_msi(pdev);
964 }
965 EXPORT_SYMBOL(pci_disable_msi);
966
967 void pci_scan_msi_device(struct pci_dev *dev) {}
968 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) {return -1;}
969 void pci_disable_msix(struct pci_dev *dev) {}
970 void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
971 void pci_no_msi(void) {}
972 EXPORT_SYMBOL(pci_enable_msix);
973 EXPORT_SYMBOL(pci_disable_msix);
974
975 #endif
976
977 #ifdef CONFIG_PPC64
978 static int __init setup_noirqdistrib(char *str)
979 {
980         distribute_irqs = 0;
981         return 1;
982 }
983
984 __setup("noirqdistrib", setup_noirqdistrib);
985 #endif /* CONFIG_PPC64 */