Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / arch / powerpc / sysdev / mpic.c
1 /*
2  *  arch/powerpc/kernel/mpic.c
3  *
4  *  Driver for interrupt controllers following the OpenPIC standard, the
5  *  common implementation beeing IBM's MPIC. This driver also can deal
6  *  with various broken implementations of this HW.
7  *
8  *  Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
9  *
10  *  This file is subject to the terms and conditions of the GNU General Public
11  *  License.  See the file COPYING in the main directory of this archive
12  *  for more details.
13  */
14
15 #undef DEBUG
16 #undef DEBUG_IPI
17 #undef DEBUG_IRQ
18 #undef DEBUG_LOW
19
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/irq.h>
24 #include <linux/smp.h>
25 #include <linux/interrupt.h>
26 #include <linux/bootmem.h>
27 #include <linux/spinlock.h>
28 #include <linux/pci.h>
29 #include <linux/slab.h>
30 #include <linux/syscore_ops.h>
31
32 #include <asm/ptrace.h>
33 #include <asm/signal.h>
34 #include <asm/io.h>
35 #include <asm/pgtable.h>
36 #include <asm/irq.h>
37 #include <asm/machdep.h>
38 #include <asm/mpic.h>
39 #include <asm/smp.h>
40
41 #include "mpic.h"
42
43 #ifdef DEBUG
44 #define DBG(fmt...) printk(fmt)
45 #else
46 #define DBG(fmt...)
47 #endif
48
49 static struct mpic *mpics;
50 static struct mpic *mpic_primary;
51 static DEFINE_RAW_SPINLOCK(mpic_lock);
52
53 #ifdef CONFIG_PPC32     /* XXX for now */
54 #ifdef CONFIG_IRQ_ALL_CPUS
55 #define distribute_irqs (1)
56 #else
57 #define distribute_irqs (0)
58 #endif
59 #endif
60
61 #ifdef CONFIG_MPIC_WEIRD
62 static u32 mpic_infos[][MPIC_IDX_END] = {
63         [0] = { /* Original OpenPIC compatible MPIC */
64                 MPIC_GREG_BASE,
65                 MPIC_GREG_FEATURE_0,
66                 MPIC_GREG_GLOBAL_CONF_0,
67                 MPIC_GREG_VENDOR_ID,
68                 MPIC_GREG_IPI_VECTOR_PRI_0,
69                 MPIC_GREG_IPI_STRIDE,
70                 MPIC_GREG_SPURIOUS,
71                 MPIC_GREG_TIMER_FREQ,
72
73                 MPIC_TIMER_BASE,
74                 MPIC_TIMER_STRIDE,
75                 MPIC_TIMER_CURRENT_CNT,
76                 MPIC_TIMER_BASE_CNT,
77                 MPIC_TIMER_VECTOR_PRI,
78                 MPIC_TIMER_DESTINATION,
79
80                 MPIC_CPU_BASE,
81                 MPIC_CPU_STRIDE,
82                 MPIC_CPU_IPI_DISPATCH_0,
83                 MPIC_CPU_IPI_DISPATCH_STRIDE,
84                 MPIC_CPU_CURRENT_TASK_PRI,
85                 MPIC_CPU_WHOAMI,
86                 MPIC_CPU_INTACK,
87                 MPIC_CPU_EOI,
88                 MPIC_CPU_MCACK,
89
90                 MPIC_IRQ_BASE,
91                 MPIC_IRQ_STRIDE,
92                 MPIC_IRQ_VECTOR_PRI,
93                 MPIC_VECPRI_VECTOR_MASK,
94                 MPIC_VECPRI_POLARITY_POSITIVE,
95                 MPIC_VECPRI_POLARITY_NEGATIVE,
96                 MPIC_VECPRI_SENSE_LEVEL,
97                 MPIC_VECPRI_SENSE_EDGE,
98                 MPIC_VECPRI_POLARITY_MASK,
99                 MPIC_VECPRI_SENSE_MASK,
100                 MPIC_IRQ_DESTINATION
101         },
102         [1] = { /* Tsi108/109 PIC */
103                 TSI108_GREG_BASE,
104                 TSI108_GREG_FEATURE_0,
105                 TSI108_GREG_GLOBAL_CONF_0,
106                 TSI108_GREG_VENDOR_ID,
107                 TSI108_GREG_IPI_VECTOR_PRI_0,
108                 TSI108_GREG_IPI_STRIDE,
109                 TSI108_GREG_SPURIOUS,
110                 TSI108_GREG_TIMER_FREQ,
111
112                 TSI108_TIMER_BASE,
113                 TSI108_TIMER_STRIDE,
114                 TSI108_TIMER_CURRENT_CNT,
115                 TSI108_TIMER_BASE_CNT,
116                 TSI108_TIMER_VECTOR_PRI,
117                 TSI108_TIMER_DESTINATION,
118
119                 TSI108_CPU_BASE,
120                 TSI108_CPU_STRIDE,
121                 TSI108_CPU_IPI_DISPATCH_0,
122                 TSI108_CPU_IPI_DISPATCH_STRIDE,
123                 TSI108_CPU_CURRENT_TASK_PRI,
124                 TSI108_CPU_WHOAMI,
125                 TSI108_CPU_INTACK,
126                 TSI108_CPU_EOI,
127                 TSI108_CPU_MCACK,
128
129                 TSI108_IRQ_BASE,
130                 TSI108_IRQ_STRIDE,
131                 TSI108_IRQ_VECTOR_PRI,
132                 TSI108_VECPRI_VECTOR_MASK,
133                 TSI108_VECPRI_POLARITY_POSITIVE,
134                 TSI108_VECPRI_POLARITY_NEGATIVE,
135                 TSI108_VECPRI_SENSE_LEVEL,
136                 TSI108_VECPRI_SENSE_EDGE,
137                 TSI108_VECPRI_POLARITY_MASK,
138                 TSI108_VECPRI_SENSE_MASK,
139                 TSI108_IRQ_DESTINATION
140         },
141 };
142
143 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
144
145 #else /* CONFIG_MPIC_WEIRD */
146
147 #define MPIC_INFO(name) MPIC_##name
148
149 #endif /* CONFIG_MPIC_WEIRD */
150
151 static inline unsigned int mpic_processor_id(struct mpic *mpic)
152 {
153         unsigned int cpu = 0;
154
155         if (mpic->flags & MPIC_PRIMARY)
156                 cpu = hard_smp_processor_id();
157
158         return cpu;
159 }
160
161 /*
162  * Register accessor functions
163  */
164
165
166 static inline u32 _mpic_read(enum mpic_reg_type type,
167                              struct mpic_reg_bank *rb,
168                              unsigned int reg)
169 {
170         switch(type) {
171 #ifdef CONFIG_PPC_DCR
172         case mpic_access_dcr:
173                 return dcr_read(rb->dhost, reg);
174 #endif
175         case mpic_access_mmio_be:
176                 return in_be32(rb->base + (reg >> 2));
177         case mpic_access_mmio_le:
178         default:
179                 return in_le32(rb->base + (reg >> 2));
180         }
181 }
182
183 static inline void _mpic_write(enum mpic_reg_type type,
184                                struct mpic_reg_bank *rb,
185                                unsigned int reg, u32 value)
186 {
187         switch(type) {
188 #ifdef CONFIG_PPC_DCR
189         case mpic_access_dcr:
190                 dcr_write(rb->dhost, reg, value);
191                 break;
192 #endif
193         case mpic_access_mmio_be:
194                 out_be32(rb->base + (reg >> 2), value);
195                 break;
196         case mpic_access_mmio_le:
197         default:
198                 out_le32(rb->base + (reg >> 2), value);
199                 break;
200         }
201 }
202
203 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
204 {
205         enum mpic_reg_type type = mpic->reg_type;
206         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
207                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
208
209         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
210                 type = mpic_access_mmio_be;
211         return _mpic_read(type, &mpic->gregs, offset);
212 }
213
214 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
215 {
216         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
217                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
218
219         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
220 }
221
222 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
223 {
224         unsigned int cpu = mpic_processor_id(mpic);
225
226         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
227 }
228
229 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
230 {
231         unsigned int cpu = mpic_processor_id(mpic);
232
233         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
234 }
235
236 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
237 {
238         unsigned int    isu = src_no >> mpic->isu_shift;
239         unsigned int    idx = src_no & mpic->isu_mask;
240         unsigned int    val;
241
242         val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
243                          reg + (idx * MPIC_INFO(IRQ_STRIDE)));
244 #ifdef CONFIG_MPIC_BROKEN_REGREAD
245         if (reg == 0)
246                 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
247                         mpic->isu_reg0_shadow[src_no];
248 #endif
249         return val;
250 }
251
252 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
253                                    unsigned int reg, u32 value)
254 {
255         unsigned int    isu = src_no >> mpic->isu_shift;
256         unsigned int    idx = src_no & mpic->isu_mask;
257
258         _mpic_write(mpic->reg_type, &mpic->isus[isu],
259                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
260
261 #ifdef CONFIG_MPIC_BROKEN_REGREAD
262         if (reg == 0)
263                 mpic->isu_reg0_shadow[src_no] =
264                         value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
265 #endif
266 }
267
268 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
269 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
270 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
271 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
272 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
273 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
274 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
275 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
276
277
278 /*
279  * Low level utility functions
280  */
281
282
283 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
284                            struct mpic_reg_bank *rb, unsigned int offset,
285                            unsigned int size)
286 {
287         rb->base = ioremap(phys_addr + offset, size);
288         BUG_ON(rb->base == NULL);
289 }
290
291 #ifdef CONFIG_PPC_DCR
292 static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
293                           struct mpic_reg_bank *rb,
294                           unsigned int offset, unsigned int size)
295 {
296         const u32 *dbasep;
297
298         dbasep = of_get_property(node, "dcr-reg", NULL);
299
300         rb->dhost = dcr_map(node, *dbasep + offset, size);
301         BUG_ON(!DCR_MAP_OK(rb->dhost));
302 }
303
304 static inline void mpic_map(struct mpic *mpic, struct device_node *node,
305                             phys_addr_t phys_addr, struct mpic_reg_bank *rb,
306                             unsigned int offset, unsigned int size)
307 {
308         if (mpic->flags & MPIC_USES_DCR)
309                 _mpic_map_dcr(mpic, node, rb, offset, size);
310         else
311                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
312 }
313 #else /* CONFIG_PPC_DCR */
314 #define mpic_map(m,n,p,b,o,s)   _mpic_map_mmio(m,p,b,o,s)
315 #endif /* !CONFIG_PPC_DCR */
316
317
318
319 /* Check if we have one of those nice broken MPICs with a flipped endian on
320  * reads from IPI registers
321  */
322 static void __init mpic_test_broken_ipi(struct mpic *mpic)
323 {
324         u32 r;
325
326         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
327         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
328
329         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
330                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
331                 mpic->flags |= MPIC_BROKEN_IPI;
332         }
333 }
334
335 #ifdef CONFIG_MPIC_U3_HT_IRQS
336
337 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
338  * to force the edge setting on the MPIC and do the ack workaround.
339  */
340 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
341 {
342         if (source >= 128 || !mpic->fixups)
343                 return 0;
344         return mpic->fixups[source].base != NULL;
345 }
346
347
348 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
349 {
350         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
351
352         if (fixup->applebase) {
353                 unsigned int soff = (fixup->index >> 3) & ~3;
354                 unsigned int mask = 1U << (fixup->index & 0x1f);
355                 writel(mask, fixup->applebase + soff);
356         } else {
357                 raw_spin_lock(&mpic->fixup_lock);
358                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
359                 writel(fixup->data, fixup->base + 4);
360                 raw_spin_unlock(&mpic->fixup_lock);
361         }
362 }
363
364 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
365                                       bool level)
366 {
367         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
368         unsigned long flags;
369         u32 tmp;
370
371         if (fixup->base == NULL)
372                 return;
373
374         DBG("startup_ht_interrupt(0x%x) index: %d\n",
375             source, fixup->index);
376         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
377         /* Enable and configure */
378         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
379         tmp = readl(fixup->base + 4);
380         tmp &= ~(0x23U);
381         if (level)
382                 tmp |= 0x22;
383         writel(tmp, fixup->base + 4);
384         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
385
386 #ifdef CONFIG_PM
387         /* use the lowest bit inverted to the actual HW,
388          * set if this fixup was enabled, clear otherwise */
389         mpic->save_data[source].fixup_data = tmp | 1;
390 #endif
391 }
392
393 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
394 {
395         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
396         unsigned long flags;
397         u32 tmp;
398
399         if (fixup->base == NULL)
400                 return;
401
402         DBG("shutdown_ht_interrupt(0x%x)\n", source);
403
404         /* Disable */
405         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
406         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
407         tmp = readl(fixup->base + 4);
408         tmp |= 1;
409         writel(tmp, fixup->base + 4);
410         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
411
412 #ifdef CONFIG_PM
413         /* use the lowest bit inverted to the actual HW,
414          * set if this fixup was enabled, clear otherwise */
415         mpic->save_data[source].fixup_data = tmp & ~1;
416 #endif
417 }
418
419 #ifdef CONFIG_PCI_MSI
420 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
421                                     unsigned int devfn)
422 {
423         u8 __iomem *base;
424         u8 pos, flags;
425         u64 addr = 0;
426
427         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
428              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
429                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
430                 if (id == PCI_CAP_ID_HT) {
431                         id = readb(devbase + pos + 3);
432                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
433                                 break;
434                 }
435         }
436
437         if (pos == 0)
438                 return;
439
440         base = devbase + pos;
441
442         flags = readb(base + HT_MSI_FLAGS);
443         if (!(flags & HT_MSI_FLAGS_FIXED)) {
444                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
445                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
446         }
447
448         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
449                 PCI_SLOT(devfn), PCI_FUNC(devfn),
450                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
451
452         if (!(flags & HT_MSI_FLAGS_ENABLE))
453                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
454 }
455 #else
456 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
457                                     unsigned int devfn)
458 {
459         return;
460 }
461 #endif
462
463 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
464                                     unsigned int devfn, u32 vdid)
465 {
466         int i, irq, n;
467         u8 __iomem *base;
468         u32 tmp;
469         u8 pos;
470
471         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
472              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
473                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
474                 if (id == PCI_CAP_ID_HT) {
475                         id = readb(devbase + pos + 3);
476                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
477                                 break;
478                 }
479         }
480         if (pos == 0)
481                 return;
482
483         base = devbase + pos;
484         writeb(0x01, base + 2);
485         n = (readl(base + 4) >> 16) & 0xff;
486
487         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
488                " has %d irqs\n",
489                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
490
491         for (i = 0; i <= n; i++) {
492                 writeb(0x10 + 2 * i, base + 2);
493                 tmp = readl(base + 4);
494                 irq = (tmp >> 16) & 0xff;
495                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
496                 /* mask it , will be unmasked later */
497                 tmp |= 0x1;
498                 writel(tmp, base + 4);
499                 mpic->fixups[irq].index = i;
500                 mpic->fixups[irq].base = base;
501                 /* Apple HT PIC has a non-standard way of doing EOIs */
502                 if ((vdid & 0xffff) == 0x106b)
503                         mpic->fixups[irq].applebase = devbase + 0x60;
504                 else
505                         mpic->fixups[irq].applebase = NULL;
506                 writeb(0x11 + 2 * i, base + 2);
507                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
508         }
509 }
510  
511
512 static void __init mpic_scan_ht_pics(struct mpic *mpic)
513 {
514         unsigned int devfn;
515         u8 __iomem *cfgspace;
516
517         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
518
519         /* Allocate fixups array */
520         mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
521         BUG_ON(mpic->fixups == NULL);
522
523         /* Init spinlock */
524         raw_spin_lock_init(&mpic->fixup_lock);
525
526         /* Map U3 config space. We assume all IO-APICs are on the primary bus
527          * so we only need to map 64kB.
528          */
529         cfgspace = ioremap(0xf2000000, 0x10000);
530         BUG_ON(cfgspace == NULL);
531
532         /* Now we scan all slots. We do a very quick scan, we read the header
533          * type, vendor ID and device ID only, that's plenty enough
534          */
535         for (devfn = 0; devfn < 0x100; devfn++) {
536                 u8 __iomem *devbase = cfgspace + (devfn << 8);
537                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
538                 u32 l = readl(devbase + PCI_VENDOR_ID);
539                 u16 s;
540
541                 DBG("devfn %x, l: %x\n", devfn, l);
542
543                 /* If no device, skip */
544                 if (l == 0xffffffff || l == 0x00000000 ||
545                     l == 0x0000ffff || l == 0xffff0000)
546                         goto next;
547                 /* Check if is supports capability lists */
548                 s = readw(devbase + PCI_STATUS);
549                 if (!(s & PCI_STATUS_CAP_LIST))
550                         goto next;
551
552                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
553                 mpic_scan_ht_msi(mpic, devbase, devfn);
554
555         next:
556                 /* next device, if function 0 */
557                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
558                         devfn += 7;
559         }
560 }
561
562 #else /* CONFIG_MPIC_U3_HT_IRQS */
563
564 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
565 {
566         return 0;
567 }
568
569 static void __init mpic_scan_ht_pics(struct mpic *mpic)
570 {
571 }
572
573 #endif /* CONFIG_MPIC_U3_HT_IRQS */
574
575 #ifdef CONFIG_SMP
576 static int irq_choose_cpu(const struct cpumask *mask)
577 {
578         int cpuid;
579
580         if (cpumask_equal(mask, cpu_all_mask)) {
581                 static int irq_rover = 0;
582                 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
583                 unsigned long flags;
584
585                 /* Round-robin distribution... */
586         do_round_robin:
587                 raw_spin_lock_irqsave(&irq_rover_lock, flags);
588
589                 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
590                 if (irq_rover >= nr_cpu_ids)
591                         irq_rover = cpumask_first(cpu_online_mask);
592
593                 cpuid = irq_rover;
594
595                 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
596         } else {
597                 cpuid = cpumask_first_and(mask, cpu_online_mask);
598                 if (cpuid >= nr_cpu_ids)
599                         goto do_round_robin;
600         }
601
602         return get_hard_smp_processor_id(cpuid);
603 }
604 #else
605 static int irq_choose_cpu(const struct cpumask *mask)
606 {
607         return hard_smp_processor_id();
608 }
609 #endif
610
611 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
612
613 /* Find an mpic associated with a given linux interrupt */
614 static struct mpic *mpic_find(unsigned int irq)
615 {
616         if (irq < NUM_ISA_INTERRUPTS)
617                 return NULL;
618
619         return irq_get_chip_data(irq);
620 }
621
622 /* Determine if the linux irq is an IPI */
623 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int irq)
624 {
625         unsigned int src = mpic_irq_to_hw(irq);
626
627         return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
628 }
629
630
631 /* Convert a cpu mask from logical to physical cpu numbers. */
632 static inline u32 mpic_physmask(u32 cpumask)
633 {
634         int i;
635         u32 mask = 0;
636
637         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
638                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
639         return mask;
640 }
641
642 #ifdef CONFIG_SMP
643 /* Get the mpic structure from the IPI number */
644 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
645 {
646         return irq_data_get_irq_chip_data(d);
647 }
648 #endif
649
650 /* Get the mpic structure from the irq number */
651 static inline struct mpic * mpic_from_irq(unsigned int irq)
652 {
653         return irq_get_chip_data(irq);
654 }
655
656 /* Get the mpic structure from the irq data */
657 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
658 {
659         return irq_data_get_irq_chip_data(d);
660 }
661
662 /* Send an EOI */
663 static inline void mpic_eoi(struct mpic *mpic)
664 {
665         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
666         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
667 }
668
669 /*
670  * Linux descriptor level callbacks
671  */
672
673
674 void mpic_unmask_irq(struct irq_data *d)
675 {
676         unsigned int loops = 100000;
677         struct mpic *mpic = mpic_from_irq_data(d);
678         unsigned int src = mpic_irq_to_hw(d->irq);
679
680         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
681
682         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
683                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
684                        ~MPIC_VECPRI_MASK);
685         /* make sure mask gets to controller before we return to user */
686         do {
687                 if (!loops--) {
688                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
689                                __func__, src);
690                         break;
691                 }
692         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
693 }
694
695 void mpic_mask_irq(struct irq_data *d)
696 {
697         unsigned int loops = 100000;
698         struct mpic *mpic = mpic_from_irq_data(d);
699         unsigned int src = mpic_irq_to_hw(d->irq);
700
701         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
702
703         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
704                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
705                        MPIC_VECPRI_MASK);
706
707         /* make sure mask gets to controller before we return to user */
708         do {
709                 if (!loops--) {
710                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
711                                __func__, src);
712                         break;
713                 }
714         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
715 }
716
717 void mpic_end_irq(struct irq_data *d)
718 {
719         struct mpic *mpic = mpic_from_irq_data(d);
720
721 #ifdef DEBUG_IRQ
722         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
723 #endif
724         /* We always EOI on end_irq() even for edge interrupts since that
725          * should only lower the priority, the MPIC should have properly
726          * latched another edge interrupt coming in anyway
727          */
728
729         mpic_eoi(mpic);
730 }
731
732 #ifdef CONFIG_MPIC_U3_HT_IRQS
733
734 static void mpic_unmask_ht_irq(struct irq_data *d)
735 {
736         struct mpic *mpic = mpic_from_irq_data(d);
737         unsigned int src = mpic_irq_to_hw(d->irq);
738
739         mpic_unmask_irq(d);
740
741         if (irqd_is_level_type(d))
742                 mpic_ht_end_irq(mpic, src);
743 }
744
745 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
746 {
747         struct mpic *mpic = mpic_from_irq_data(d);
748         unsigned int src = mpic_irq_to_hw(d->irq);
749
750         mpic_unmask_irq(d);
751         mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
752
753         return 0;
754 }
755
756 static void mpic_shutdown_ht_irq(struct irq_data *d)
757 {
758         struct mpic *mpic = mpic_from_irq_data(d);
759         unsigned int src = mpic_irq_to_hw(d->irq);
760
761         mpic_shutdown_ht_interrupt(mpic, src);
762         mpic_mask_irq(d);
763 }
764
765 static void mpic_end_ht_irq(struct irq_data *d)
766 {
767         struct mpic *mpic = mpic_from_irq_data(d);
768         unsigned int src = mpic_irq_to_hw(d->irq);
769
770 #ifdef DEBUG_IRQ
771         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
772 #endif
773         /* We always EOI on end_irq() even for edge interrupts since that
774          * should only lower the priority, the MPIC should have properly
775          * latched another edge interrupt coming in anyway
776          */
777
778         if (irqd_is_level_type(d))
779                 mpic_ht_end_irq(mpic, src);
780         mpic_eoi(mpic);
781 }
782 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
783
784 #ifdef CONFIG_SMP
785
786 static void mpic_unmask_ipi(struct irq_data *d)
787 {
788         struct mpic *mpic = mpic_from_ipi(d);
789         unsigned int src = mpic_irq_to_hw(d->irq) - mpic->ipi_vecs[0];
790
791         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
792         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
793 }
794
795 static void mpic_mask_ipi(struct irq_data *d)
796 {
797         /* NEVER disable an IPI... that's just plain wrong! */
798 }
799
800 static void mpic_end_ipi(struct irq_data *d)
801 {
802         struct mpic *mpic = mpic_from_ipi(d);
803
804         /*
805          * IPIs are marked IRQ_PER_CPU. This has the side effect of
806          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
807          * applying to them. We EOI them late to avoid re-entering.
808          * We mark IPI's with IRQF_DISABLED as they must run with
809          * irqs disabled.
810          */
811         mpic_eoi(mpic);
812 }
813
814 #endif /* CONFIG_SMP */
815
816 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
817                       bool force)
818 {
819         struct mpic *mpic = mpic_from_irq_data(d);
820         unsigned int src = mpic_irq_to_hw(d->irq);
821
822         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
823                 int cpuid = irq_choose_cpu(cpumask);
824
825                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
826         } else {
827                 cpumask_var_t tmp;
828
829                 alloc_cpumask_var(&tmp, GFP_KERNEL);
830
831                 cpumask_and(tmp, cpumask, cpu_online_mask);
832
833                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
834                                mpic_physmask(cpumask_bits(tmp)[0]));
835
836                 free_cpumask_var(tmp);
837         }
838
839         return 0;
840 }
841
842 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
843 {
844         /* Now convert sense value */
845         switch(type & IRQ_TYPE_SENSE_MASK) {
846         case IRQ_TYPE_EDGE_RISING:
847                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
848                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
849         case IRQ_TYPE_EDGE_FALLING:
850         case IRQ_TYPE_EDGE_BOTH:
851                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
852                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
853         case IRQ_TYPE_LEVEL_HIGH:
854                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
855                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
856         case IRQ_TYPE_LEVEL_LOW:
857         default:
858                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
859                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
860         }
861 }
862
863 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
864 {
865         struct mpic *mpic = mpic_from_irq_data(d);
866         unsigned int src = mpic_irq_to_hw(d->irq);
867         unsigned int vecpri, vold, vnew;
868
869         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
870             mpic, d->irq, src, flow_type);
871
872         if (src >= mpic->irq_count)
873                 return -EINVAL;
874
875         if (flow_type == IRQ_TYPE_NONE)
876                 if (mpic->senses && src < mpic->senses_count)
877                         flow_type = mpic->senses[src];
878         if (flow_type == IRQ_TYPE_NONE)
879                 flow_type = IRQ_TYPE_LEVEL_LOW;
880
881         irqd_set_trigger_type(d, flow_type);
882
883         if (mpic_is_ht_interrupt(mpic, src))
884                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
885                         MPIC_VECPRI_SENSE_EDGE;
886         else
887                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
888
889         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
890         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
891                         MPIC_INFO(VECPRI_SENSE_MASK));
892         vnew |= vecpri;
893         if (vold != vnew)
894                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
895
896         return IRQ_SET_MASK_OK_NOCOPY;;
897 }
898
899 void mpic_set_vector(unsigned int virq, unsigned int vector)
900 {
901         struct mpic *mpic = mpic_from_irq(virq);
902         unsigned int src = mpic_irq_to_hw(virq);
903         unsigned int vecpri;
904
905         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
906             mpic, virq, src, vector);
907
908         if (src >= mpic->irq_count)
909                 return;
910
911         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
912         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
913         vecpri |= vector;
914         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
915 }
916
917 void mpic_set_destination(unsigned int virq, unsigned int cpuid)
918 {
919         struct mpic *mpic = mpic_from_irq(virq);
920         unsigned int src = mpic_irq_to_hw(virq);
921
922         DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
923             mpic, virq, src, cpuid);
924
925         if (src >= mpic->irq_count)
926                 return;
927
928         mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
929 }
930
931 static struct irq_chip mpic_irq_chip = {
932         .irq_mask       = mpic_mask_irq,
933         .irq_unmask     = mpic_unmask_irq,
934         .irq_eoi        = mpic_end_irq,
935         .irq_set_type   = mpic_set_irq_type,
936 };
937
938 #ifdef CONFIG_SMP
939 static struct irq_chip mpic_ipi_chip = {
940         .irq_mask       = mpic_mask_ipi,
941         .irq_unmask     = mpic_unmask_ipi,
942         .irq_eoi        = mpic_end_ipi,
943 };
944 #endif /* CONFIG_SMP */
945
946 #ifdef CONFIG_MPIC_U3_HT_IRQS
947 static struct irq_chip mpic_irq_ht_chip = {
948         .irq_startup    = mpic_startup_ht_irq,
949         .irq_shutdown   = mpic_shutdown_ht_irq,
950         .irq_mask       = mpic_mask_irq,
951         .irq_unmask     = mpic_unmask_ht_irq,
952         .irq_eoi        = mpic_end_ht_irq,
953         .irq_set_type   = mpic_set_irq_type,
954 };
955 #endif /* CONFIG_MPIC_U3_HT_IRQS */
956
957
958 static int mpic_host_match(struct irq_host *h, struct device_node *node)
959 {
960         /* Exact match, unless mpic node is NULL */
961         return h->of_node == NULL || h->of_node == node;
962 }
963
964 static int mpic_host_map(struct irq_host *h, unsigned int virq,
965                          irq_hw_number_t hw)
966 {
967         struct mpic *mpic = h->host_data;
968         struct irq_chip *chip;
969
970         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
971
972         if (hw == mpic->spurious_vec)
973                 return -EINVAL;
974         if (mpic->protected && test_bit(hw, mpic->protected))
975                 return -EINVAL;
976
977 #ifdef CONFIG_SMP
978         else if (hw >= mpic->ipi_vecs[0]) {
979                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
980
981                 DBG("mpic: mapping as IPI\n");
982                 irq_set_chip_data(virq, mpic);
983                 irq_set_chip_and_handler(virq, &mpic->hc_ipi,
984                                          handle_percpu_irq);
985                 return 0;
986         }
987 #endif /* CONFIG_SMP */
988
989         if (hw >= mpic->irq_count)
990                 return -EINVAL;
991
992         mpic_msi_reserve_hwirq(mpic, hw);
993
994         /* Default chip */
995         chip = &mpic->hc_irq;
996
997 #ifdef CONFIG_MPIC_U3_HT_IRQS
998         /* Check for HT interrupts, override vecpri */
999         if (mpic_is_ht_interrupt(mpic, hw))
1000                 chip = &mpic->hc_ht_irq;
1001 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1002
1003         DBG("mpic: mapping to irq chip @%p\n", chip);
1004
1005         irq_set_chip_data(virq, mpic);
1006         irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1007
1008         /* Set default irq type */
1009         irq_set_irq_type(virq, IRQ_TYPE_NONE);
1010
1011         /* If the MPIC was reset, then all vectors have already been
1012          * initialized.  Otherwise, a per source lazy initialization
1013          * is done here.
1014          */
1015         if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1016                 mpic_set_vector(virq, hw);
1017                 mpic_set_destination(virq, mpic_processor_id(mpic));
1018                 mpic_irq_set_priority(virq, 8);
1019         }
1020
1021         return 0;
1022 }
1023
1024 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
1025                            const u32 *intspec, unsigned int intsize,
1026                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1027
1028 {
1029         static unsigned char map_mpic_senses[4] = {
1030                 IRQ_TYPE_EDGE_RISING,
1031                 IRQ_TYPE_LEVEL_LOW,
1032                 IRQ_TYPE_LEVEL_HIGH,
1033                 IRQ_TYPE_EDGE_FALLING,
1034         };
1035
1036         *out_hwirq = intspec[0];
1037         if (intsize > 1) {
1038                 u32 mask = 0x3;
1039
1040                 /* Apple invented a new race of encoding on machines with
1041                  * an HT APIC. They encode, among others, the index within
1042                  * the HT APIC. We don't care about it here since thankfully,
1043                  * it appears that they have the APIC already properly
1044                  * configured, and thus our current fixup code that reads the
1045                  * APIC config works fine. However, we still need to mask out
1046                  * bits in the specifier to make sure we only get bit 0 which
1047                  * is the level/edge bit (the only sense bit exposed by Apple),
1048                  * as their bit 1 means something else.
1049                  */
1050                 if (machine_is(powermac))
1051                         mask = 0x1;
1052                 *out_flags = map_mpic_senses[intspec[1] & mask];
1053         } else
1054                 *out_flags = IRQ_TYPE_NONE;
1055
1056         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1057             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1058
1059         return 0;
1060 }
1061
1062 static struct irq_host_ops mpic_host_ops = {
1063         .match = mpic_host_match,
1064         .map = mpic_host_map,
1065         .xlate = mpic_host_xlate,
1066 };
1067
1068 static int mpic_reset_prohibited(struct device_node *node)
1069 {
1070         return node && of_get_property(node, "pic-no-reset", NULL);
1071 }
1072
1073 /*
1074  * Exported functions
1075  */
1076
1077 struct mpic * __init mpic_alloc(struct device_node *node,
1078                                 phys_addr_t phys_addr,
1079                                 unsigned int flags,
1080                                 unsigned int isu_size,
1081                                 unsigned int irq_count,
1082                                 const char *name)
1083 {
1084         struct mpic     *mpic;
1085         u32             greg_feature;
1086         const char      *vers;
1087         int             i;
1088         int             intvec_top;
1089         u64             paddr = phys_addr;
1090
1091         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1092         if (mpic == NULL)
1093                 return NULL;
1094
1095         mpic->name = name;
1096
1097         mpic->hc_irq = mpic_irq_chip;
1098         mpic->hc_irq.name = name;
1099         if (flags & MPIC_PRIMARY)
1100                 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1101 #ifdef CONFIG_MPIC_U3_HT_IRQS
1102         mpic->hc_ht_irq = mpic_irq_ht_chip;
1103         mpic->hc_ht_irq.name = name;
1104         if (flags & MPIC_PRIMARY)
1105                 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1106 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1107
1108 #ifdef CONFIG_SMP
1109         mpic->hc_ipi = mpic_ipi_chip;
1110         mpic->hc_ipi.name = name;
1111 #endif /* CONFIG_SMP */
1112
1113         mpic->flags = flags;
1114         mpic->isu_size = isu_size;
1115         mpic->irq_count = irq_count;
1116         mpic->num_sources = 0; /* so far */
1117
1118         if (flags & MPIC_LARGE_VECTORS)
1119                 intvec_top = 2047;
1120         else
1121                 intvec_top = 255;
1122
1123         mpic->timer_vecs[0] = intvec_top - 8;
1124         mpic->timer_vecs[1] = intvec_top - 7;
1125         mpic->timer_vecs[2] = intvec_top - 6;
1126         mpic->timer_vecs[3] = intvec_top - 5;
1127         mpic->ipi_vecs[0]   = intvec_top - 4;
1128         mpic->ipi_vecs[1]   = intvec_top - 3;
1129         mpic->ipi_vecs[2]   = intvec_top - 2;
1130         mpic->ipi_vecs[3]   = intvec_top - 1;
1131         mpic->spurious_vec  = intvec_top;
1132
1133         /* Check for "big-endian" in device-tree */
1134         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1135                 mpic->flags |= MPIC_BIG_ENDIAN;
1136
1137         /* Look for protected sources */
1138         if (node) {
1139                 int psize;
1140                 unsigned int bits, mapsize;
1141                 const u32 *psrc =
1142                         of_get_property(node, "protected-sources", &psize);
1143                 if (psrc) {
1144                         psize /= 4;
1145                         bits = intvec_top + 1;
1146                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1147                         mpic->protected = kzalloc(mapsize, GFP_KERNEL);
1148                         BUG_ON(mpic->protected == NULL);
1149                         for (i = 0; i < psize; i++) {
1150                                 if (psrc[i] > intvec_top)
1151                                         continue;
1152                                 __set_bit(psrc[i], mpic->protected);
1153                         }
1154                 }
1155         }
1156
1157 #ifdef CONFIG_MPIC_WEIRD
1158         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1159 #endif
1160
1161         /* default register type */
1162         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1163                 mpic_access_mmio_be : mpic_access_mmio_le;
1164
1165         /* If no physical address is passed in, a device-node is mandatory */
1166         BUG_ON(paddr == 0 && node == NULL);
1167
1168         /* If no physical address passed in, check if it's dcr based */
1169         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1170 #ifdef CONFIG_PPC_DCR
1171                 mpic->flags |= MPIC_USES_DCR;
1172                 mpic->reg_type = mpic_access_dcr;
1173 #else
1174                 BUG();
1175 #endif /* CONFIG_PPC_DCR */
1176         }
1177
1178         /* If the MPIC is not DCR based, and no physical address was passed
1179          * in, try to obtain one
1180          */
1181         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1182                 const u32 *reg = of_get_property(node, "reg", NULL);
1183                 BUG_ON(reg == NULL);
1184                 paddr = of_translate_address(node, reg);
1185                 BUG_ON(paddr == OF_BAD_ADDR);
1186         }
1187
1188         /* Map the global registers */
1189         mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1190         mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1191
1192         /* Reset */
1193
1194         /* When using a device-node, reset requests are only honored if the MPIC
1195          * is allowed to reset.
1196          */
1197         if (mpic_reset_prohibited(node))
1198                 mpic->flags |= MPIC_NO_RESET;
1199
1200         if ((flags & MPIC_WANTS_RESET) && !(mpic->flags & MPIC_NO_RESET)) {
1201                 printk(KERN_DEBUG "mpic: Resetting\n");
1202                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1203                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1204                            | MPIC_GREG_GCONF_RESET);
1205                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1206                        & MPIC_GREG_GCONF_RESET)
1207                         mb();
1208         }
1209
1210         /* CoreInt */
1211         if (flags & MPIC_ENABLE_COREINT)
1212                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1213                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1214                            | MPIC_GREG_GCONF_COREINT);
1215
1216         if (flags & MPIC_ENABLE_MCK)
1217                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1218                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1219                            | MPIC_GREG_GCONF_MCK);
1220
1221         /* Read feature register, calculate num CPUs and, for non-ISU
1222          * MPICs, num sources as well. On ISU MPICs, sources are counted
1223          * as ISUs are added
1224          */
1225         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1226         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1227                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1228         if (isu_size == 0) {
1229                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1230                         mpic->num_sources = mpic->irq_count;
1231                 else
1232                         mpic->num_sources =
1233                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1234                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1235         }
1236
1237         /* Map the per-CPU registers */
1238         for (i = 0; i < mpic->num_cpus; i++) {
1239                 mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
1240                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1241                          0x1000);
1242         }
1243
1244         /* Initialize main ISU if none provided */
1245         if (mpic->isu_size == 0) {
1246                 mpic->isu_size = mpic->num_sources;
1247                 mpic_map(mpic, node, paddr, &mpic->isus[0],
1248                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1249         }
1250         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1251         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1252
1253         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1254                                        isu_size ? isu_size : mpic->num_sources,
1255                                        &mpic_host_ops,
1256                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1257         if (mpic->irqhost == NULL)
1258                 return NULL;
1259
1260         mpic->irqhost->host_data = mpic;
1261
1262         /* Display version */
1263         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1264         case 1:
1265                 vers = "1.0";
1266                 break;
1267         case 2:
1268                 vers = "1.2";
1269                 break;
1270         case 3:
1271                 vers = "1.3";
1272                 break;
1273         default:
1274                 vers = "<unknown>";
1275                 break;
1276         }
1277         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1278                " max %d CPUs\n",
1279                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1280         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1281                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1282
1283         mpic->next = mpics;
1284         mpics = mpic;
1285
1286         if (flags & MPIC_PRIMARY) {
1287                 mpic_primary = mpic;
1288                 irq_set_default_host(mpic->irqhost);
1289         }
1290
1291         return mpic;
1292 }
1293
1294 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1295                             phys_addr_t paddr)
1296 {
1297         unsigned int isu_first = isu_num * mpic->isu_size;
1298
1299         BUG_ON(isu_num >= MPIC_MAX_ISU);
1300
1301         mpic_map(mpic, mpic->irqhost->of_node,
1302                  paddr, &mpic->isus[isu_num], 0,
1303                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1304
1305         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1306                 mpic->num_sources = isu_first + mpic->isu_size;
1307 }
1308
1309 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1310 {
1311         mpic->senses = senses;
1312         mpic->senses_count = count;
1313 }
1314
1315 void __init mpic_init(struct mpic *mpic)
1316 {
1317         int i;
1318         int cpu;
1319
1320         BUG_ON(mpic->num_sources == 0);
1321
1322         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1323
1324         /* Set current processor priority to max */
1325         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1326
1327         /* Initialize timers: just disable them all */
1328         for (i = 0; i < 4; i++) {
1329                 mpic_write(mpic->tmregs,
1330                            i * MPIC_INFO(TIMER_STRIDE) +
1331                            MPIC_INFO(TIMER_DESTINATION), 0);
1332                 mpic_write(mpic->tmregs,
1333                            i * MPIC_INFO(TIMER_STRIDE) +
1334                            MPIC_INFO(TIMER_VECTOR_PRI),
1335                            MPIC_VECPRI_MASK |
1336                            (mpic->timer_vecs[0] + i));
1337         }
1338
1339         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1340         mpic_test_broken_ipi(mpic);
1341         for (i = 0; i < 4; i++) {
1342                 mpic_ipi_write(i,
1343                                MPIC_VECPRI_MASK |
1344                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1345                                (mpic->ipi_vecs[0] + i));
1346         }
1347
1348         /* Initialize interrupt sources */
1349         if (mpic->irq_count == 0)
1350                 mpic->irq_count = mpic->num_sources;
1351
1352         /* Do the HT PIC fixups on U3 broken mpic */
1353         DBG("MPIC flags: %x\n", mpic->flags);
1354         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1355                 mpic_scan_ht_pics(mpic);
1356                 mpic_u3msi_init(mpic);
1357         }
1358
1359         mpic_pasemi_msi_init(mpic);
1360
1361         cpu = mpic_processor_id(mpic);
1362
1363         if (!(mpic->flags & MPIC_NO_RESET)) {
1364                 for (i = 0; i < mpic->num_sources; i++) {
1365                         /* start with vector = source number, and masked */
1366                         u32 vecpri = MPIC_VECPRI_MASK | i |
1367                                 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1368                 
1369                         /* check if protected */
1370                         if (mpic->protected && test_bit(i, mpic->protected))
1371                                 continue;
1372                         /* init hw */
1373                         mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1374                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1375                 }
1376         }
1377         
1378         /* Init spurious vector */
1379         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1380
1381         /* Disable 8259 passthrough, if supported */
1382         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1383                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1384                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1385                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1386
1387         if (mpic->flags & MPIC_NO_BIAS)
1388                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1389                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1390                         | MPIC_GREG_GCONF_NO_BIAS);
1391
1392         /* Set current processor priority to 0 */
1393         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1394
1395 #ifdef CONFIG_PM
1396         /* allocate memory to save mpic state */
1397         mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1398                                   GFP_KERNEL);
1399         BUG_ON(mpic->save_data == NULL);
1400 #endif
1401 }
1402
1403 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1404 {
1405         u32 v;
1406
1407         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1408         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1409         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1410         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1411 }
1412
1413 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1414 {
1415         unsigned long flags;
1416         u32 v;
1417
1418         raw_spin_lock_irqsave(&mpic_lock, flags);
1419         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1420         if (enable)
1421                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1422         else
1423                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1424         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1425         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1426 }
1427
1428 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1429 {
1430         struct mpic *mpic = mpic_find(irq);
1431         unsigned int src = mpic_irq_to_hw(irq);
1432         unsigned long flags;
1433         u32 reg;
1434
1435         if (!mpic)
1436                 return;
1437
1438         raw_spin_lock_irqsave(&mpic_lock, flags);
1439         if (mpic_is_ipi(mpic, irq)) {
1440                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1441                         ~MPIC_VECPRI_PRIORITY_MASK;
1442                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1443                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1444         } else {
1445                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1446                         & ~MPIC_VECPRI_PRIORITY_MASK;
1447                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1448                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1449         }
1450         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1451 }
1452
1453 void mpic_setup_this_cpu(void)
1454 {
1455 #ifdef CONFIG_SMP
1456         struct mpic *mpic = mpic_primary;
1457         unsigned long flags;
1458         u32 msk = 1 << hard_smp_processor_id();
1459         unsigned int i;
1460
1461         BUG_ON(mpic == NULL);
1462
1463         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1464
1465         raw_spin_lock_irqsave(&mpic_lock, flags);
1466
1467         /* let the mpic know we want intrs. default affinity is 0xffffffff
1468          * until changed via /proc. That's how it's done on x86. If we want
1469          * it differently, then we should make sure we also change the default
1470          * values of irq_desc[].affinity in irq.c.
1471          */
1472         if (distribute_irqs) {
1473                 for (i = 0; i < mpic->num_sources ; i++)
1474                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1475                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1476         }
1477
1478         /* Set current processor priority to 0 */
1479         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1480
1481         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1482 #endif /* CONFIG_SMP */
1483 }
1484
1485 int mpic_cpu_get_priority(void)
1486 {
1487         struct mpic *mpic = mpic_primary;
1488
1489         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1490 }
1491
1492 void mpic_cpu_set_priority(int prio)
1493 {
1494         struct mpic *mpic = mpic_primary;
1495
1496         prio &= MPIC_CPU_TASKPRI_MASK;
1497         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1498 }
1499
1500 void mpic_teardown_this_cpu(int secondary)
1501 {
1502         struct mpic *mpic = mpic_primary;
1503         unsigned long flags;
1504         u32 msk = 1 << hard_smp_processor_id();
1505         unsigned int i;
1506
1507         BUG_ON(mpic == NULL);
1508
1509         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1510         raw_spin_lock_irqsave(&mpic_lock, flags);
1511
1512         /* let the mpic know we don't want intrs.  */
1513         for (i = 0; i < mpic->num_sources ; i++)
1514                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1515                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1516
1517         /* Set current processor priority to max */
1518         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1519         /* We need to EOI the IPI since not all platforms reset the MPIC
1520          * on boot and new interrupts wouldn't get delivered otherwise.
1521          */
1522         mpic_eoi(mpic);
1523
1524         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1525 }
1526
1527
1528 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1529 {
1530         u32 src;
1531
1532         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1533 #ifdef DEBUG_LOW
1534         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1535 #endif
1536         if (unlikely(src == mpic->spurious_vec)) {
1537                 if (mpic->flags & MPIC_SPV_EOI)
1538                         mpic_eoi(mpic);
1539                 return NO_IRQ;
1540         }
1541         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1542                 if (printk_ratelimit())
1543                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1544                                mpic->name, (int)src);
1545                 mpic_eoi(mpic);
1546                 return NO_IRQ;
1547         }
1548
1549         return irq_linear_revmap(mpic->irqhost, src);
1550 }
1551
1552 unsigned int mpic_get_one_irq(struct mpic *mpic)
1553 {
1554         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1555 }
1556
1557 unsigned int mpic_get_irq(void)
1558 {
1559         struct mpic *mpic = mpic_primary;
1560
1561         BUG_ON(mpic == NULL);
1562
1563         return mpic_get_one_irq(mpic);
1564 }
1565
1566 unsigned int mpic_get_coreint_irq(void)
1567 {
1568 #ifdef CONFIG_BOOKE
1569         struct mpic *mpic = mpic_primary;
1570         u32 src;
1571
1572         BUG_ON(mpic == NULL);
1573
1574         src = mfspr(SPRN_EPR);
1575
1576         if (unlikely(src == mpic->spurious_vec)) {
1577                 if (mpic->flags & MPIC_SPV_EOI)
1578                         mpic_eoi(mpic);
1579                 return NO_IRQ;
1580         }
1581         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1582                 if (printk_ratelimit())
1583                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1584                                mpic->name, (int)src);
1585                 return NO_IRQ;
1586         }
1587
1588         return irq_linear_revmap(mpic->irqhost, src);
1589 #else
1590         return NO_IRQ;
1591 #endif
1592 }
1593
1594 unsigned int mpic_get_mcirq(void)
1595 {
1596         struct mpic *mpic = mpic_primary;
1597
1598         BUG_ON(mpic == NULL);
1599
1600         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1601 }
1602
1603 #ifdef CONFIG_SMP
1604 void mpic_request_ipis(void)
1605 {
1606         struct mpic *mpic = mpic_primary;
1607         int i;
1608         BUG_ON(mpic == NULL);
1609
1610         printk(KERN_INFO "mpic: requesting IPIs...\n");
1611
1612         for (i = 0; i < 4; i++) {
1613                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1614                                                        mpic->ipi_vecs[0] + i);
1615                 if (vipi == NO_IRQ) {
1616                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1617                         continue;
1618                 }
1619                 smp_request_message_ipi(vipi, i);
1620         }
1621 }
1622
1623 static void mpic_send_ipi(unsigned int ipi_no, const struct cpumask *cpu_mask)
1624 {
1625         struct mpic *mpic = mpic_primary;
1626
1627         BUG_ON(mpic == NULL);
1628
1629 #ifdef DEBUG_IPI
1630         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1631 #endif
1632
1633         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1634                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1635                        mpic_physmask(cpumask_bits(cpu_mask)[0]));
1636 }
1637
1638 void smp_mpic_message_pass(int target, int msg)
1639 {
1640         cpumask_var_t tmp;
1641
1642         /* make sure we're sending something that translates to an IPI */
1643         if ((unsigned int)msg > 3) {
1644                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1645                        smp_processor_id(), msg);
1646                 return;
1647         }
1648         switch (target) {
1649         case MSG_ALL:
1650                 mpic_send_ipi(msg, cpu_online_mask);
1651                 break;
1652         case MSG_ALL_BUT_SELF:
1653                 alloc_cpumask_var(&tmp, GFP_NOWAIT);
1654                 cpumask_andnot(tmp, cpu_online_mask,
1655                                cpumask_of(smp_processor_id()));
1656                 mpic_send_ipi(msg, tmp);
1657                 free_cpumask_var(tmp);
1658                 break;
1659         default:
1660                 mpic_send_ipi(msg, cpumask_of(target));
1661                 break;
1662         }
1663 }
1664
1665 int __init smp_mpic_probe(void)
1666 {
1667         int nr_cpus;
1668
1669         DBG("smp_mpic_probe()...\n");
1670
1671         nr_cpus = cpumask_weight(cpu_possible_mask);
1672
1673         DBG("nr_cpus: %d\n", nr_cpus);
1674
1675         if (nr_cpus > 1)
1676                 mpic_request_ipis();
1677
1678         return nr_cpus;
1679 }
1680
1681 void __devinit smp_mpic_setup_cpu(int cpu)
1682 {
1683         mpic_setup_this_cpu();
1684 }
1685
1686 void mpic_reset_core(int cpu)
1687 {
1688         struct mpic *mpic = mpic_primary;
1689         u32 pir;
1690         int cpuid = get_hard_smp_processor_id(cpu);
1691
1692         /* Set target bit for core reset */
1693         pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1694         pir |= (1 << cpuid);
1695         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1696         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1697
1698         /* Restore target bit after reset complete */
1699         pir &= ~(1 << cpuid);
1700         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1701         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1702 }
1703 #endif /* CONFIG_SMP */
1704
1705 #ifdef CONFIG_PM
1706 static void mpic_suspend_one(struct mpic *mpic)
1707 {
1708         int i;
1709
1710         for (i = 0; i < mpic->num_sources; i++) {
1711                 mpic->save_data[i].vecprio =
1712                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1713                 mpic->save_data[i].dest =
1714                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1715         }
1716 }
1717
1718 static int mpic_suspend(void)
1719 {
1720         struct mpic *mpic = mpics;
1721
1722         while (mpic) {
1723                 mpic_suspend_one(mpic);
1724                 mpic = mpic->next;
1725         }
1726
1727         return 0;
1728 }
1729
1730 static void mpic_resume_one(struct mpic *mpic)
1731 {
1732         int i;
1733
1734         for (i = 0; i < mpic->num_sources; i++) {
1735                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1736                                mpic->save_data[i].vecprio);
1737                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1738                                mpic->save_data[i].dest);
1739
1740 #ifdef CONFIG_MPIC_U3_HT_IRQS
1741         if (mpic->fixups) {
1742                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1743
1744                 if (fixup->base) {
1745                         /* we use the lowest bit in an inverted meaning */
1746                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1747                                 continue;
1748
1749                         /* Enable and configure */
1750                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1751
1752                         writel(mpic->save_data[i].fixup_data & ~1,
1753                                fixup->base + 4);
1754                 }
1755         }
1756 #endif
1757         } /* end for loop */
1758 }
1759
1760 static void mpic_resume(void)
1761 {
1762         struct mpic *mpic = mpics;
1763
1764         while (mpic) {
1765                 mpic_resume_one(mpic);
1766                 mpic = mpic->next;
1767         }
1768 }
1769
1770 static struct syscore_ops mpic_syscore_ops = {
1771         .resume = mpic_resume,
1772         .suspend = mpic_suspend,
1773 };
1774
1775 static int mpic_init_sys(void)
1776 {
1777         register_syscore_ops(&mpic_syscore_ops);
1778         return 0;
1779 }
1780
1781 device_initcall(mpic_init_sys);
1782 #endif