7c1342618a307560b187767d65ae6a6e24c4ddd0
[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
31 #include <asm/ptrace.h>
32 #include <asm/signal.h>
33 #include <asm/io.h>
34 #include <asm/pgtable.h>
35 #include <asm/irq.h>
36 #include <asm/machdep.h>
37 #include <asm/mpic.h>
38 #include <asm/smp.h>
39
40 #include "mpic.h"
41
42 #ifdef DEBUG
43 #define DBG(fmt...) printk(fmt)
44 #else
45 #define DBG(fmt...)
46 #endif
47
48 static struct mpic *mpics;
49 static struct mpic *mpic_primary;
50 static DEFINE_RAW_SPINLOCK(mpic_lock);
51
52 #ifdef CONFIG_PPC32     /* XXX for now */
53 #ifdef CONFIG_IRQ_ALL_CPUS
54 #define distribute_irqs (1)
55 #else
56 #define distribute_irqs (0)
57 #endif
58 #endif
59
60 #ifdef CONFIG_MPIC_WEIRD
61 static u32 mpic_infos[][MPIC_IDX_END] = {
62         [0] = { /* Original OpenPIC compatible MPIC */
63                 MPIC_GREG_BASE,
64                 MPIC_GREG_FEATURE_0,
65                 MPIC_GREG_GLOBAL_CONF_0,
66                 MPIC_GREG_VENDOR_ID,
67                 MPIC_GREG_IPI_VECTOR_PRI_0,
68                 MPIC_GREG_IPI_STRIDE,
69                 MPIC_GREG_SPURIOUS,
70                 MPIC_GREG_TIMER_FREQ,
71
72                 MPIC_TIMER_BASE,
73                 MPIC_TIMER_STRIDE,
74                 MPIC_TIMER_CURRENT_CNT,
75                 MPIC_TIMER_BASE_CNT,
76                 MPIC_TIMER_VECTOR_PRI,
77                 MPIC_TIMER_DESTINATION,
78
79                 MPIC_CPU_BASE,
80                 MPIC_CPU_STRIDE,
81                 MPIC_CPU_IPI_DISPATCH_0,
82                 MPIC_CPU_IPI_DISPATCH_STRIDE,
83                 MPIC_CPU_CURRENT_TASK_PRI,
84                 MPIC_CPU_WHOAMI,
85                 MPIC_CPU_INTACK,
86                 MPIC_CPU_EOI,
87                 MPIC_CPU_MCACK,
88
89                 MPIC_IRQ_BASE,
90                 MPIC_IRQ_STRIDE,
91                 MPIC_IRQ_VECTOR_PRI,
92                 MPIC_VECPRI_VECTOR_MASK,
93                 MPIC_VECPRI_POLARITY_POSITIVE,
94                 MPIC_VECPRI_POLARITY_NEGATIVE,
95                 MPIC_VECPRI_SENSE_LEVEL,
96                 MPIC_VECPRI_SENSE_EDGE,
97                 MPIC_VECPRI_POLARITY_MASK,
98                 MPIC_VECPRI_SENSE_MASK,
99                 MPIC_IRQ_DESTINATION
100         },
101         [1] = { /* Tsi108/109 PIC */
102                 TSI108_GREG_BASE,
103                 TSI108_GREG_FEATURE_0,
104                 TSI108_GREG_GLOBAL_CONF_0,
105                 TSI108_GREG_VENDOR_ID,
106                 TSI108_GREG_IPI_VECTOR_PRI_0,
107                 TSI108_GREG_IPI_STRIDE,
108                 TSI108_GREG_SPURIOUS,
109                 TSI108_GREG_TIMER_FREQ,
110
111                 TSI108_TIMER_BASE,
112                 TSI108_TIMER_STRIDE,
113                 TSI108_TIMER_CURRENT_CNT,
114                 TSI108_TIMER_BASE_CNT,
115                 TSI108_TIMER_VECTOR_PRI,
116                 TSI108_TIMER_DESTINATION,
117
118                 TSI108_CPU_BASE,
119                 TSI108_CPU_STRIDE,
120                 TSI108_CPU_IPI_DISPATCH_0,
121                 TSI108_CPU_IPI_DISPATCH_STRIDE,
122                 TSI108_CPU_CURRENT_TASK_PRI,
123                 TSI108_CPU_WHOAMI,
124                 TSI108_CPU_INTACK,
125                 TSI108_CPU_EOI,
126                 TSI108_CPU_MCACK,
127
128                 TSI108_IRQ_BASE,
129                 TSI108_IRQ_STRIDE,
130                 TSI108_IRQ_VECTOR_PRI,
131                 TSI108_VECPRI_VECTOR_MASK,
132                 TSI108_VECPRI_POLARITY_POSITIVE,
133                 TSI108_VECPRI_POLARITY_NEGATIVE,
134                 TSI108_VECPRI_SENSE_LEVEL,
135                 TSI108_VECPRI_SENSE_EDGE,
136                 TSI108_VECPRI_POLARITY_MASK,
137                 TSI108_VECPRI_SENSE_MASK,
138                 TSI108_IRQ_DESTINATION
139         },
140 };
141
142 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
143
144 #else /* CONFIG_MPIC_WEIRD */
145
146 #define MPIC_INFO(name) MPIC_##name
147
148 #endif /* CONFIG_MPIC_WEIRD */
149
150 /*
151  * Register accessor functions
152  */
153
154
155 static inline u32 _mpic_read(enum mpic_reg_type type,
156                              struct mpic_reg_bank *rb,
157                              unsigned int reg)
158 {
159         switch(type) {
160 #ifdef CONFIG_PPC_DCR
161         case mpic_access_dcr:
162                 return dcr_read(rb->dhost, reg);
163 #endif
164         case mpic_access_mmio_be:
165                 return in_be32(rb->base + (reg >> 2));
166         case mpic_access_mmio_le:
167         default:
168                 return in_le32(rb->base + (reg >> 2));
169         }
170 }
171
172 static inline void _mpic_write(enum mpic_reg_type type,
173                                struct mpic_reg_bank *rb,
174                                unsigned int reg, u32 value)
175 {
176         switch(type) {
177 #ifdef CONFIG_PPC_DCR
178         case mpic_access_dcr:
179                 dcr_write(rb->dhost, reg, value);
180                 break;
181 #endif
182         case mpic_access_mmio_be:
183                 out_be32(rb->base + (reg >> 2), value);
184                 break;
185         case mpic_access_mmio_le:
186         default:
187                 out_le32(rb->base + (reg >> 2), value);
188                 break;
189         }
190 }
191
192 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
193 {
194         enum mpic_reg_type type = mpic->reg_type;
195         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
196                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
197
198         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
199                 type = mpic_access_mmio_be;
200         return _mpic_read(type, &mpic->gregs, offset);
201 }
202
203 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
204 {
205         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
206                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
207
208         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
209 }
210
211 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
212 {
213         unsigned int cpu = 0;
214
215         if (mpic->flags & MPIC_PRIMARY)
216                 cpu = hard_smp_processor_id();
217         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
218 }
219
220 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
221 {
222         unsigned int cpu = 0;
223
224         if (mpic->flags & MPIC_PRIMARY)
225                 cpu = hard_smp_processor_id();
226
227         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
228 }
229
230 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
231 {
232         unsigned int    isu = src_no >> mpic->isu_shift;
233         unsigned int    idx = src_no & mpic->isu_mask;
234         unsigned int    val;
235
236         val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
237                          reg + (idx * MPIC_INFO(IRQ_STRIDE)));
238 #ifdef CONFIG_MPIC_BROKEN_REGREAD
239         if (reg == 0)
240                 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
241                         mpic->isu_reg0_shadow[src_no];
242 #endif
243         return val;
244 }
245
246 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
247                                    unsigned int reg, u32 value)
248 {
249         unsigned int    isu = src_no >> mpic->isu_shift;
250         unsigned int    idx = src_no & mpic->isu_mask;
251
252         _mpic_write(mpic->reg_type, &mpic->isus[isu],
253                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
254
255 #ifdef CONFIG_MPIC_BROKEN_REGREAD
256         if (reg == 0)
257                 mpic->isu_reg0_shadow[src_no] =
258                         value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
259 #endif
260 }
261
262 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
263 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
264 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
265 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
266 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
267 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
268 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
269 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
270
271
272 /*
273  * Low level utility functions
274  */
275
276
277 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
278                            struct mpic_reg_bank *rb, unsigned int offset,
279                            unsigned int size)
280 {
281         rb->base = ioremap(phys_addr + offset, size);
282         BUG_ON(rb->base == NULL);
283 }
284
285 #ifdef CONFIG_PPC_DCR
286 static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
287                           struct mpic_reg_bank *rb,
288                           unsigned int offset, unsigned int size)
289 {
290         const u32 *dbasep;
291
292         dbasep = of_get_property(node, "dcr-reg", NULL);
293
294         rb->dhost = dcr_map(node, *dbasep + offset, size);
295         BUG_ON(!DCR_MAP_OK(rb->dhost));
296 }
297
298 static inline void mpic_map(struct mpic *mpic, struct device_node *node,
299                             phys_addr_t phys_addr, struct mpic_reg_bank *rb,
300                             unsigned int offset, unsigned int size)
301 {
302         if (mpic->flags & MPIC_USES_DCR)
303                 _mpic_map_dcr(mpic, node, rb, offset, size);
304         else
305                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
306 }
307 #else /* CONFIG_PPC_DCR */
308 #define mpic_map(m,n,p,b,o,s)   _mpic_map_mmio(m,p,b,o,s)
309 #endif /* !CONFIG_PPC_DCR */
310
311
312
313 /* Check if we have one of those nice broken MPICs with a flipped endian on
314  * reads from IPI registers
315  */
316 static void __init mpic_test_broken_ipi(struct mpic *mpic)
317 {
318         u32 r;
319
320         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
321         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
322
323         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
324                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
325                 mpic->flags |= MPIC_BROKEN_IPI;
326         }
327 }
328
329 #ifdef CONFIG_MPIC_U3_HT_IRQS
330
331 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
332  * to force the edge setting on the MPIC and do the ack workaround.
333  */
334 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
335 {
336         if (source >= 128 || !mpic->fixups)
337                 return 0;
338         return mpic->fixups[source].base != NULL;
339 }
340
341
342 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
343 {
344         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
345
346         if (fixup->applebase) {
347                 unsigned int soff = (fixup->index >> 3) & ~3;
348                 unsigned int mask = 1U << (fixup->index & 0x1f);
349                 writel(mask, fixup->applebase + soff);
350         } else {
351                 raw_spin_lock(&mpic->fixup_lock);
352                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
353                 writel(fixup->data, fixup->base + 4);
354                 raw_spin_unlock(&mpic->fixup_lock);
355         }
356 }
357
358 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
359                                       unsigned int irqflags)
360 {
361         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
362         unsigned long flags;
363         u32 tmp;
364
365         if (fixup->base == NULL)
366                 return;
367
368         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
369             source, irqflags, fixup->index);
370         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
371         /* Enable and configure */
372         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
373         tmp = readl(fixup->base + 4);
374         tmp &= ~(0x23U);
375         if (irqflags & IRQ_LEVEL)
376                 tmp |= 0x22;
377         writel(tmp, fixup->base + 4);
378         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
379
380 #ifdef CONFIG_PM
381         /* use the lowest bit inverted to the actual HW,
382          * set if this fixup was enabled, clear otherwise */
383         mpic->save_data[source].fixup_data = tmp | 1;
384 #endif
385 }
386
387 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
388                                        unsigned int irqflags)
389 {
390         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
391         unsigned long flags;
392         u32 tmp;
393
394         if (fixup->base == NULL)
395                 return;
396
397         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
398
399         /* Disable */
400         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
401         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
402         tmp = readl(fixup->base + 4);
403         tmp |= 1;
404         writel(tmp, fixup->base + 4);
405         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
406
407 #ifdef CONFIG_PM
408         /* use the lowest bit inverted to the actual HW,
409          * set if this fixup was enabled, clear otherwise */
410         mpic->save_data[source].fixup_data = tmp & ~1;
411 #endif
412 }
413
414 #ifdef CONFIG_PCI_MSI
415 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
416                                     unsigned int devfn)
417 {
418         u8 __iomem *base;
419         u8 pos, flags;
420         u64 addr = 0;
421
422         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
423              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
424                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
425                 if (id == PCI_CAP_ID_HT) {
426                         id = readb(devbase + pos + 3);
427                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
428                                 break;
429                 }
430         }
431
432         if (pos == 0)
433                 return;
434
435         base = devbase + pos;
436
437         flags = readb(base + HT_MSI_FLAGS);
438         if (!(flags & HT_MSI_FLAGS_FIXED)) {
439                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
440                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
441         }
442
443         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
444                 PCI_SLOT(devfn), PCI_FUNC(devfn),
445                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
446
447         if (!(flags & HT_MSI_FLAGS_ENABLE))
448                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
449 }
450 #else
451 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
452                                     unsigned int devfn)
453 {
454         return;
455 }
456 #endif
457
458 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
459                                     unsigned int devfn, u32 vdid)
460 {
461         int i, irq, n;
462         u8 __iomem *base;
463         u32 tmp;
464         u8 pos;
465
466         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
467              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
468                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
469                 if (id == PCI_CAP_ID_HT) {
470                         id = readb(devbase + pos + 3);
471                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
472                                 break;
473                 }
474         }
475         if (pos == 0)
476                 return;
477
478         base = devbase + pos;
479         writeb(0x01, base + 2);
480         n = (readl(base + 4) >> 16) & 0xff;
481
482         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
483                " has %d irqs\n",
484                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
485
486         for (i = 0; i <= n; i++) {
487                 writeb(0x10 + 2 * i, base + 2);
488                 tmp = readl(base + 4);
489                 irq = (tmp >> 16) & 0xff;
490                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
491                 /* mask it , will be unmasked later */
492                 tmp |= 0x1;
493                 writel(tmp, base + 4);
494                 mpic->fixups[irq].index = i;
495                 mpic->fixups[irq].base = base;
496                 /* Apple HT PIC has a non-standard way of doing EOIs */
497                 if ((vdid & 0xffff) == 0x106b)
498                         mpic->fixups[irq].applebase = devbase + 0x60;
499                 else
500                         mpic->fixups[irq].applebase = NULL;
501                 writeb(0x11 + 2 * i, base + 2);
502                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
503         }
504 }
505  
506
507 static void __init mpic_scan_ht_pics(struct mpic *mpic)
508 {
509         unsigned int devfn;
510         u8 __iomem *cfgspace;
511
512         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
513
514         /* Allocate fixups array */
515         mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
516         BUG_ON(mpic->fixups == NULL);
517
518         /* Init spinlock */
519         raw_spin_lock_init(&mpic->fixup_lock);
520
521         /* Map U3 config space. We assume all IO-APICs are on the primary bus
522          * so we only need to map 64kB.
523          */
524         cfgspace = ioremap(0xf2000000, 0x10000);
525         BUG_ON(cfgspace == NULL);
526
527         /* Now we scan all slots. We do a very quick scan, we read the header
528          * type, vendor ID and device ID only, that's plenty enough
529          */
530         for (devfn = 0; devfn < 0x100; devfn++) {
531                 u8 __iomem *devbase = cfgspace + (devfn << 8);
532                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
533                 u32 l = readl(devbase + PCI_VENDOR_ID);
534                 u16 s;
535
536                 DBG("devfn %x, l: %x\n", devfn, l);
537
538                 /* If no device, skip */
539                 if (l == 0xffffffff || l == 0x00000000 ||
540                     l == 0x0000ffff || l == 0xffff0000)
541                         goto next;
542                 /* Check if is supports capability lists */
543                 s = readw(devbase + PCI_STATUS);
544                 if (!(s & PCI_STATUS_CAP_LIST))
545                         goto next;
546
547                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
548                 mpic_scan_ht_msi(mpic, devbase, devfn);
549
550         next:
551                 /* next device, if function 0 */
552                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
553                         devfn += 7;
554         }
555 }
556
557 #else /* CONFIG_MPIC_U3_HT_IRQS */
558
559 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
560 {
561         return 0;
562 }
563
564 static void __init mpic_scan_ht_pics(struct mpic *mpic)
565 {
566 }
567
568 #endif /* CONFIG_MPIC_U3_HT_IRQS */
569
570 #ifdef CONFIG_SMP
571 static int irq_choose_cpu(const struct cpumask *mask)
572 {
573         int cpuid;
574
575         if (cpumask_equal(mask, cpu_all_mask)) {
576                 static int irq_rover = 0;
577                 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
578                 unsigned long flags;
579
580                 /* Round-robin distribution... */
581         do_round_robin:
582                 raw_spin_lock_irqsave(&irq_rover_lock, flags);
583
584                 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
585                 if (irq_rover >= nr_cpu_ids)
586                         irq_rover = cpumask_first(cpu_online_mask);
587
588                 cpuid = irq_rover;
589
590                 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
591         } else {
592                 cpuid = cpumask_first_and(mask, cpu_online_mask);
593                 if (cpuid >= nr_cpu_ids)
594                         goto do_round_robin;
595         }
596
597         return get_hard_smp_processor_id(cpuid);
598 }
599 #else
600 static int irq_choose_cpu(const struct cpumask *mask)
601 {
602         return hard_smp_processor_id();
603 }
604 #endif
605
606 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
607
608 /* Find an mpic associated with a given linux interrupt */
609 static struct mpic *mpic_find(unsigned int irq)
610 {
611         if (irq < NUM_ISA_INTERRUPTS)
612                 return NULL;
613
614         return irq_to_desc(irq)->chip_data;
615 }
616
617 /* Determine if the linux irq is an IPI */
618 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int irq)
619 {
620         unsigned int src = mpic_irq_to_hw(irq);
621
622         return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
623 }
624
625
626 /* Convert a cpu mask from logical to physical cpu numbers. */
627 static inline u32 mpic_physmask(u32 cpumask)
628 {
629         int i;
630         u32 mask = 0;
631
632         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
633                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
634         return mask;
635 }
636
637 #ifdef CONFIG_SMP
638 /* Get the mpic structure from the IPI number */
639 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
640 {
641         return irq_to_desc(ipi)->chip_data;
642 }
643 #endif
644
645 /* Get the mpic structure from the irq number */
646 static inline struct mpic * mpic_from_irq(unsigned int irq)
647 {
648         return irq_to_desc(irq)->chip_data;
649 }
650
651 /* Send an EOI */
652 static inline void mpic_eoi(struct mpic *mpic)
653 {
654         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
655         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
656 }
657
658 /*
659  * Linux descriptor level callbacks
660  */
661
662
663 void mpic_unmask_irq(unsigned int irq)
664 {
665         unsigned int loops = 100000;
666         struct mpic *mpic = mpic_from_irq(irq);
667         unsigned int src = mpic_irq_to_hw(irq);
668
669         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
670
671         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
672                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
673                        ~MPIC_VECPRI_MASK);
674         /* make sure mask gets to controller before we return to user */
675         do {
676                 if (!loops--) {
677                         printk(KERN_ERR "mpic_enable_irq timeout\n");
678                         break;
679                 }
680         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
681 }
682
683 void mpic_mask_irq(unsigned int irq)
684 {
685         unsigned int loops = 100000;
686         struct mpic *mpic = mpic_from_irq(irq);
687         unsigned int src = mpic_irq_to_hw(irq);
688
689         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
690
691         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
692                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
693                        MPIC_VECPRI_MASK);
694
695         /* make sure mask gets to controller before we return to user */
696         do {
697                 if (!loops--) {
698                         printk(KERN_ERR "mpic_enable_irq timeout\n");
699                         break;
700                 }
701         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
702 }
703
704 void mpic_end_irq(unsigned int irq)
705 {
706         struct mpic *mpic = mpic_from_irq(irq);
707
708 #ifdef DEBUG_IRQ
709         DBG("%s: end_irq: %d\n", mpic->name, irq);
710 #endif
711         /* We always EOI on end_irq() even for edge interrupts since that
712          * should only lower the priority, the MPIC should have properly
713          * latched another edge interrupt coming in anyway
714          */
715
716         mpic_eoi(mpic);
717 }
718
719 #ifdef CONFIG_MPIC_U3_HT_IRQS
720
721 static void mpic_unmask_ht_irq(unsigned int irq)
722 {
723         struct mpic *mpic = mpic_from_irq(irq);
724         unsigned int src = mpic_irq_to_hw(irq);
725
726         mpic_unmask_irq(irq);
727
728         if (irq_to_desc(irq)->status & IRQ_LEVEL)
729                 mpic_ht_end_irq(mpic, src);
730 }
731
732 static unsigned int mpic_startup_ht_irq(unsigned int irq)
733 {
734         struct mpic *mpic = mpic_from_irq(irq);
735         unsigned int src = mpic_irq_to_hw(irq);
736
737         mpic_unmask_irq(irq);
738         mpic_startup_ht_interrupt(mpic, src, irq_to_desc(irq)->status);
739
740         return 0;
741 }
742
743 static void mpic_shutdown_ht_irq(unsigned int irq)
744 {
745         struct mpic *mpic = mpic_from_irq(irq);
746         unsigned int src = mpic_irq_to_hw(irq);
747
748         mpic_shutdown_ht_interrupt(mpic, src, irq_to_desc(irq)->status);
749         mpic_mask_irq(irq);
750 }
751
752 static void mpic_end_ht_irq(unsigned int irq)
753 {
754         struct mpic *mpic = mpic_from_irq(irq);
755         unsigned int src = mpic_irq_to_hw(irq);
756
757 #ifdef DEBUG_IRQ
758         DBG("%s: end_irq: %d\n", mpic->name, irq);
759 #endif
760         /* We always EOI on end_irq() even for edge interrupts since that
761          * should only lower the priority, the MPIC should have properly
762          * latched another edge interrupt coming in anyway
763          */
764
765         if (irq_to_desc(irq)->status & IRQ_LEVEL)
766                 mpic_ht_end_irq(mpic, src);
767         mpic_eoi(mpic);
768 }
769 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
770
771 #ifdef CONFIG_SMP
772
773 static void mpic_unmask_ipi(unsigned int irq)
774 {
775         struct mpic *mpic = mpic_from_ipi(irq);
776         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
777
778         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
779         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
780 }
781
782 static void mpic_mask_ipi(unsigned int irq)
783 {
784         /* NEVER disable an IPI... that's just plain wrong! */
785 }
786
787 static void mpic_end_ipi(unsigned int irq)
788 {
789         struct mpic *mpic = mpic_from_ipi(irq);
790
791         /*
792          * IPIs are marked IRQ_PER_CPU. This has the side effect of
793          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
794          * applying to them. We EOI them late to avoid re-entering.
795          * We mark IPI's with IRQF_DISABLED as they must run with
796          * irqs disabled.
797          */
798         mpic_eoi(mpic);
799 }
800
801 #endif /* CONFIG_SMP */
802
803 int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
804 {
805         struct mpic *mpic = mpic_from_irq(irq);
806         unsigned int src = mpic_irq_to_hw(irq);
807
808         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
809                 int cpuid = irq_choose_cpu(cpumask);
810
811                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
812         } else {
813                 cpumask_var_t tmp;
814
815                 alloc_cpumask_var(&tmp, GFP_KERNEL);
816
817                 cpumask_and(tmp, cpumask, cpu_online_mask);
818
819                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
820                                mpic_physmask(cpumask_bits(tmp)[0]));
821
822                 free_cpumask_var(tmp);
823         }
824
825         return 0;
826 }
827
828 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
829 {
830         /* Now convert sense value */
831         switch(type & IRQ_TYPE_SENSE_MASK) {
832         case IRQ_TYPE_EDGE_RISING:
833                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
834                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
835         case IRQ_TYPE_EDGE_FALLING:
836         case IRQ_TYPE_EDGE_BOTH:
837                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
838                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
839         case IRQ_TYPE_LEVEL_HIGH:
840                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
841                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
842         case IRQ_TYPE_LEVEL_LOW:
843         default:
844                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
845                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
846         }
847 }
848
849 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
850 {
851         struct mpic *mpic = mpic_from_irq(virq);
852         unsigned int src = mpic_irq_to_hw(virq);
853         struct irq_desc *desc = irq_to_desc(virq);
854         unsigned int vecpri, vold, vnew;
855
856         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
857             mpic, virq, src, flow_type);
858
859         if (src >= mpic->irq_count)
860                 return -EINVAL;
861
862         if (flow_type == IRQ_TYPE_NONE)
863                 if (mpic->senses && src < mpic->senses_count)
864                         flow_type = mpic->senses[src];
865         if (flow_type == IRQ_TYPE_NONE)
866                 flow_type = IRQ_TYPE_LEVEL_LOW;
867
868         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
869         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
870         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
871                 desc->status |= IRQ_LEVEL;
872
873         if (mpic_is_ht_interrupt(mpic, src))
874                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
875                         MPIC_VECPRI_SENSE_EDGE;
876         else
877                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
878
879         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
880         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
881                         MPIC_INFO(VECPRI_SENSE_MASK));
882         vnew |= vecpri;
883         if (vold != vnew)
884                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
885
886         return 0;
887 }
888
889 void mpic_set_vector(unsigned int virq, unsigned int vector)
890 {
891         struct mpic *mpic = mpic_from_irq(virq);
892         unsigned int src = mpic_irq_to_hw(virq);
893         unsigned int vecpri;
894
895         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
896             mpic, virq, src, vector);
897
898         if (src >= mpic->irq_count)
899                 return;
900
901         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
902         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
903         vecpri |= vector;
904         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
905 }
906
907 static struct irq_chip mpic_irq_chip = {
908         .mask           = mpic_mask_irq,
909         .unmask         = mpic_unmask_irq,
910         .eoi            = mpic_end_irq,
911         .set_type       = mpic_set_irq_type,
912 };
913
914 #ifdef CONFIG_SMP
915 static struct irq_chip mpic_ipi_chip = {
916         .mask           = mpic_mask_ipi,
917         .unmask         = mpic_unmask_ipi,
918         .eoi            = mpic_end_ipi,
919 };
920 #endif /* CONFIG_SMP */
921
922 #ifdef CONFIG_MPIC_U3_HT_IRQS
923 static struct irq_chip mpic_irq_ht_chip = {
924         .startup        = mpic_startup_ht_irq,
925         .shutdown       = mpic_shutdown_ht_irq,
926         .mask           = mpic_mask_irq,
927         .unmask         = mpic_unmask_ht_irq,
928         .eoi            = mpic_end_ht_irq,
929         .set_type       = mpic_set_irq_type,
930 };
931 #endif /* CONFIG_MPIC_U3_HT_IRQS */
932
933
934 static int mpic_host_match(struct irq_host *h, struct device_node *node)
935 {
936         /* Exact match, unless mpic node is NULL */
937         return h->of_node == NULL || h->of_node == node;
938 }
939
940 static int mpic_host_map(struct irq_host *h, unsigned int virq,
941                          irq_hw_number_t hw)
942 {
943         struct mpic *mpic = h->host_data;
944         struct irq_chip *chip;
945
946         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
947
948         if (hw == mpic->spurious_vec)
949                 return -EINVAL;
950         if (mpic->protected && test_bit(hw, mpic->protected))
951                 return -EINVAL;
952
953 #ifdef CONFIG_SMP
954         else if (hw >= mpic->ipi_vecs[0]) {
955                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
956
957                 DBG("mpic: mapping as IPI\n");
958                 set_irq_chip_data(virq, mpic);
959                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
960                                          handle_percpu_irq);
961                 return 0;
962         }
963 #endif /* CONFIG_SMP */
964
965         if (hw >= mpic->irq_count)
966                 return -EINVAL;
967
968         mpic_msi_reserve_hwirq(mpic, hw);
969
970         /* Default chip */
971         chip = &mpic->hc_irq;
972
973 #ifdef CONFIG_MPIC_U3_HT_IRQS
974         /* Check for HT interrupts, override vecpri */
975         if (mpic_is_ht_interrupt(mpic, hw))
976                 chip = &mpic->hc_ht_irq;
977 #endif /* CONFIG_MPIC_U3_HT_IRQS */
978
979         DBG("mpic: mapping to irq chip @%p\n", chip);
980
981         set_irq_chip_data(virq, mpic);
982         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
983
984         /* Set default irq type */
985         set_irq_type(virq, IRQ_TYPE_NONE);
986
987         return 0;
988 }
989
990 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
991                            const u32 *intspec, unsigned int intsize,
992                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
993
994 {
995         static unsigned char map_mpic_senses[4] = {
996                 IRQ_TYPE_EDGE_RISING,
997                 IRQ_TYPE_LEVEL_LOW,
998                 IRQ_TYPE_LEVEL_HIGH,
999                 IRQ_TYPE_EDGE_FALLING,
1000         };
1001
1002         *out_hwirq = intspec[0];
1003         if (intsize > 1) {
1004                 u32 mask = 0x3;
1005
1006                 /* Apple invented a new race of encoding on machines with
1007                  * an HT APIC. They encode, among others, the index within
1008                  * the HT APIC. We don't care about it here since thankfully,
1009                  * it appears that they have the APIC already properly
1010                  * configured, and thus our current fixup code that reads the
1011                  * APIC config works fine. However, we still need to mask out
1012                  * bits in the specifier to make sure we only get bit 0 which
1013                  * is the level/edge bit (the only sense bit exposed by Apple),
1014                  * as their bit 1 means something else.
1015                  */
1016                 if (machine_is(powermac))
1017                         mask = 0x1;
1018                 *out_flags = map_mpic_senses[intspec[1] & mask];
1019         } else
1020                 *out_flags = IRQ_TYPE_NONE;
1021
1022         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1023             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1024
1025         return 0;
1026 }
1027
1028 static struct irq_host_ops mpic_host_ops = {
1029         .match = mpic_host_match,
1030         .map = mpic_host_map,
1031         .xlate = mpic_host_xlate,
1032 };
1033
1034 /*
1035  * Exported functions
1036  */
1037
1038 struct mpic * __init mpic_alloc(struct device_node *node,
1039                                 phys_addr_t phys_addr,
1040                                 unsigned int flags,
1041                                 unsigned int isu_size,
1042                                 unsigned int irq_count,
1043                                 const char *name)
1044 {
1045         struct mpic     *mpic;
1046         u32             greg_feature;
1047         const char      *vers;
1048         int             i;
1049         int             intvec_top;
1050         u64             paddr = phys_addr;
1051
1052         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1053         if (mpic == NULL)
1054                 return NULL;
1055
1056         mpic->name = name;
1057
1058         mpic->hc_irq = mpic_irq_chip;
1059         mpic->hc_irq.name = name;
1060         if (flags & MPIC_PRIMARY)
1061                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1062 #ifdef CONFIG_MPIC_U3_HT_IRQS
1063         mpic->hc_ht_irq = mpic_irq_ht_chip;
1064         mpic->hc_ht_irq.name = name;
1065         if (flags & MPIC_PRIMARY)
1066                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1067 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1068
1069 #ifdef CONFIG_SMP
1070         mpic->hc_ipi = mpic_ipi_chip;
1071         mpic->hc_ipi.name = name;
1072 #endif /* CONFIG_SMP */
1073
1074         mpic->flags = flags;
1075         mpic->isu_size = isu_size;
1076         mpic->irq_count = irq_count;
1077         mpic->num_sources = 0; /* so far */
1078
1079         if (flags & MPIC_LARGE_VECTORS)
1080                 intvec_top = 2047;
1081         else
1082                 intvec_top = 255;
1083
1084         mpic->timer_vecs[0] = intvec_top - 8;
1085         mpic->timer_vecs[1] = intvec_top - 7;
1086         mpic->timer_vecs[2] = intvec_top - 6;
1087         mpic->timer_vecs[3] = intvec_top - 5;
1088         mpic->ipi_vecs[0]   = intvec_top - 4;
1089         mpic->ipi_vecs[1]   = intvec_top - 3;
1090         mpic->ipi_vecs[2]   = intvec_top - 2;
1091         mpic->ipi_vecs[3]   = intvec_top - 1;
1092         mpic->spurious_vec  = intvec_top;
1093
1094         /* Check for "big-endian" in device-tree */
1095         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1096                 mpic->flags |= MPIC_BIG_ENDIAN;
1097
1098         /* Look for protected sources */
1099         if (node) {
1100                 int psize;
1101                 unsigned int bits, mapsize;
1102                 const u32 *psrc =
1103                         of_get_property(node, "protected-sources", &psize);
1104                 if (psrc) {
1105                         psize /= 4;
1106                         bits = intvec_top + 1;
1107                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1108                         mpic->protected = kzalloc(mapsize, GFP_KERNEL);
1109                         BUG_ON(mpic->protected == NULL);
1110                         for (i = 0; i < psize; i++) {
1111                                 if (psrc[i] > intvec_top)
1112                                         continue;
1113                                 __set_bit(psrc[i], mpic->protected);
1114                         }
1115                 }
1116         }
1117
1118 #ifdef CONFIG_MPIC_WEIRD
1119         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1120 #endif
1121
1122         /* default register type */
1123         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1124                 mpic_access_mmio_be : mpic_access_mmio_le;
1125
1126         /* If no physical address is passed in, a device-node is mandatory */
1127         BUG_ON(paddr == 0 && node == NULL);
1128
1129         /* If no physical address passed in, check if it's dcr based */
1130         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1131 #ifdef CONFIG_PPC_DCR
1132                 mpic->flags |= MPIC_USES_DCR;
1133                 mpic->reg_type = mpic_access_dcr;
1134 #else
1135                 BUG();
1136 #endif /* CONFIG_PPC_DCR */
1137         }
1138
1139         /* If the MPIC is not DCR based, and no physical address was passed
1140          * in, try to obtain one
1141          */
1142         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1143                 const u32 *reg = of_get_property(node, "reg", NULL);
1144                 BUG_ON(reg == NULL);
1145                 paddr = of_translate_address(node, reg);
1146                 BUG_ON(paddr == OF_BAD_ADDR);
1147         }
1148
1149         /* Map the global registers */
1150         mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1151         mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1152
1153         /* Reset */
1154         if (flags & MPIC_WANTS_RESET) {
1155                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1156                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1157                            | MPIC_GREG_GCONF_RESET);
1158                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1159                        & MPIC_GREG_GCONF_RESET)
1160                         mb();
1161         }
1162
1163         /* CoreInt */
1164         if (flags & MPIC_ENABLE_COREINT)
1165                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1166                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1167                            | MPIC_GREG_GCONF_COREINT);
1168
1169         if (flags & MPIC_ENABLE_MCK)
1170                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1171                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1172                            | MPIC_GREG_GCONF_MCK);
1173
1174         /* Read feature register, calculate num CPUs and, for non-ISU
1175          * MPICs, num sources as well. On ISU MPICs, sources are counted
1176          * as ISUs are added
1177          */
1178         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1179         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1180                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1181         if (isu_size == 0) {
1182                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1183                         mpic->num_sources = mpic->irq_count;
1184                 else
1185                         mpic->num_sources =
1186                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1187                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1188         }
1189
1190         /* Map the per-CPU registers */
1191         for (i = 0; i < mpic->num_cpus; i++) {
1192                 mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
1193                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1194                          0x1000);
1195         }
1196
1197         /* Initialize main ISU if none provided */
1198         if (mpic->isu_size == 0) {
1199                 mpic->isu_size = mpic->num_sources;
1200                 mpic_map(mpic, node, paddr, &mpic->isus[0],
1201                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1202         }
1203         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1204         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1205
1206         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1207                                        isu_size ? isu_size : mpic->num_sources,
1208                                        &mpic_host_ops,
1209                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1210         if (mpic->irqhost == NULL)
1211                 return NULL;
1212
1213         mpic->irqhost->host_data = mpic;
1214
1215         /* Display version */
1216         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1217         case 1:
1218                 vers = "1.0";
1219                 break;
1220         case 2:
1221                 vers = "1.2";
1222                 break;
1223         case 3:
1224                 vers = "1.3";
1225                 break;
1226         default:
1227                 vers = "<unknown>";
1228                 break;
1229         }
1230         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1231                " max %d CPUs\n",
1232                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1233         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1234                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1235
1236         mpic->next = mpics;
1237         mpics = mpic;
1238
1239         if (flags & MPIC_PRIMARY) {
1240                 mpic_primary = mpic;
1241                 irq_set_default_host(mpic->irqhost);
1242         }
1243
1244         return mpic;
1245 }
1246
1247 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1248                             phys_addr_t paddr)
1249 {
1250         unsigned int isu_first = isu_num * mpic->isu_size;
1251
1252         BUG_ON(isu_num >= MPIC_MAX_ISU);
1253
1254         mpic_map(mpic, mpic->irqhost->of_node,
1255                  paddr, &mpic->isus[isu_num], 0,
1256                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1257
1258         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1259                 mpic->num_sources = isu_first + mpic->isu_size;
1260 }
1261
1262 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1263 {
1264         mpic->senses = senses;
1265         mpic->senses_count = count;
1266 }
1267
1268 void __init mpic_init(struct mpic *mpic)
1269 {
1270         int i;
1271         int cpu;
1272
1273         BUG_ON(mpic->num_sources == 0);
1274
1275         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1276
1277         /* Set current processor priority to max */
1278         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1279
1280         /* Initialize timers: just disable them all */
1281         for (i = 0; i < 4; i++) {
1282                 mpic_write(mpic->tmregs,
1283                            i * MPIC_INFO(TIMER_STRIDE) +
1284                            MPIC_INFO(TIMER_DESTINATION), 0);
1285                 mpic_write(mpic->tmregs,
1286                            i * MPIC_INFO(TIMER_STRIDE) +
1287                            MPIC_INFO(TIMER_VECTOR_PRI),
1288                            MPIC_VECPRI_MASK |
1289                            (mpic->timer_vecs[0] + i));
1290         }
1291
1292         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1293         mpic_test_broken_ipi(mpic);
1294         for (i = 0; i < 4; i++) {
1295                 mpic_ipi_write(i,
1296                                MPIC_VECPRI_MASK |
1297                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1298                                (mpic->ipi_vecs[0] + i));
1299         }
1300
1301         /* Initialize interrupt sources */
1302         if (mpic->irq_count == 0)
1303                 mpic->irq_count = mpic->num_sources;
1304
1305         /* Do the HT PIC fixups on U3 broken mpic */
1306         DBG("MPIC flags: %x\n", mpic->flags);
1307         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1308                 mpic_scan_ht_pics(mpic);
1309                 mpic_u3msi_init(mpic);
1310         }
1311
1312         mpic_pasemi_msi_init(mpic);
1313
1314         if (mpic->flags & MPIC_PRIMARY)
1315                 cpu = hard_smp_processor_id();
1316         else
1317                 cpu = 0;
1318
1319         for (i = 0; i < mpic->num_sources; i++) {
1320                 /* start with vector = source number, and masked */
1321                 u32 vecpri = MPIC_VECPRI_MASK | i |
1322                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1323                 
1324                 /* check if protected */
1325                 if (mpic->protected && test_bit(i, mpic->protected))
1326                         continue;
1327                 /* init hw */
1328                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1329                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1330         }
1331         
1332         /* Init spurious vector */
1333         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1334
1335         /* Disable 8259 passthrough, if supported */
1336         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1337                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1338                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1339                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1340
1341         if (mpic->flags & MPIC_NO_BIAS)
1342                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1343                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1344                         | MPIC_GREG_GCONF_NO_BIAS);
1345
1346         /* Set current processor priority to 0 */
1347         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1348
1349 #ifdef CONFIG_PM
1350         /* allocate memory to save mpic state */
1351         mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1352                                   GFP_KERNEL);
1353         BUG_ON(mpic->save_data == NULL);
1354 #endif
1355 }
1356
1357 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1358 {
1359         u32 v;
1360
1361         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1362         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1363         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1364         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1365 }
1366
1367 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1368 {
1369         unsigned long flags;
1370         u32 v;
1371
1372         raw_spin_lock_irqsave(&mpic_lock, flags);
1373         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1374         if (enable)
1375                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1376         else
1377                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1378         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1379         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1380 }
1381
1382 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1383 {
1384         struct mpic *mpic = mpic_find(irq);
1385         unsigned int src = mpic_irq_to_hw(irq);
1386         unsigned long flags;
1387         u32 reg;
1388
1389         if (!mpic)
1390                 return;
1391
1392         raw_spin_lock_irqsave(&mpic_lock, flags);
1393         if (mpic_is_ipi(mpic, irq)) {
1394                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1395                         ~MPIC_VECPRI_PRIORITY_MASK;
1396                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1397                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1398         } else {
1399                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1400                         & ~MPIC_VECPRI_PRIORITY_MASK;
1401                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1402                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1403         }
1404         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1405 }
1406
1407 void mpic_setup_this_cpu(void)
1408 {
1409 #ifdef CONFIG_SMP
1410         struct mpic *mpic = mpic_primary;
1411         unsigned long flags;
1412         u32 msk = 1 << hard_smp_processor_id();
1413         unsigned int i;
1414
1415         BUG_ON(mpic == NULL);
1416
1417         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1418
1419         raw_spin_lock_irqsave(&mpic_lock, flags);
1420
1421         /* let the mpic know we want intrs. default affinity is 0xffffffff
1422          * until changed via /proc. That's how it's done on x86. If we want
1423          * it differently, then we should make sure we also change the default
1424          * values of irq_desc[].affinity in irq.c.
1425          */
1426         if (distribute_irqs) {
1427                 for (i = 0; i < mpic->num_sources ; i++)
1428                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1429                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1430         }
1431
1432         /* Set current processor priority to 0 */
1433         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1434
1435         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1436 #endif /* CONFIG_SMP */
1437 }
1438
1439 int mpic_cpu_get_priority(void)
1440 {
1441         struct mpic *mpic = mpic_primary;
1442
1443         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1444 }
1445
1446 void mpic_cpu_set_priority(int prio)
1447 {
1448         struct mpic *mpic = mpic_primary;
1449
1450         prio &= MPIC_CPU_TASKPRI_MASK;
1451         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1452 }
1453
1454 void mpic_teardown_this_cpu(int secondary)
1455 {
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: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1464         raw_spin_lock_irqsave(&mpic_lock, flags);
1465
1466         /* let the mpic know we don't want intrs.  */
1467         for (i = 0; i < mpic->num_sources ; i++)
1468                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1469                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1470
1471         /* Set current processor priority to max */
1472         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1473         /* We need to EOI the IPI since not all platforms reset the MPIC
1474          * on boot and new interrupts wouldn't get delivered otherwise.
1475          */
1476         mpic_eoi(mpic);
1477
1478         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1479 }
1480
1481
1482 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1483 {
1484         u32 src;
1485
1486         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1487 #ifdef DEBUG_LOW
1488         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1489 #endif
1490         if (unlikely(src == mpic->spurious_vec)) {
1491                 if (mpic->flags & MPIC_SPV_EOI)
1492                         mpic_eoi(mpic);
1493                 return NO_IRQ;
1494         }
1495         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1496                 if (printk_ratelimit())
1497                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1498                                mpic->name, (int)src);
1499                 mpic_eoi(mpic);
1500                 return NO_IRQ;
1501         }
1502
1503         return irq_linear_revmap(mpic->irqhost, src);
1504 }
1505
1506 unsigned int mpic_get_one_irq(struct mpic *mpic)
1507 {
1508         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1509 }
1510
1511 unsigned int mpic_get_irq(void)
1512 {
1513         struct mpic *mpic = mpic_primary;
1514
1515         BUG_ON(mpic == NULL);
1516
1517         return mpic_get_one_irq(mpic);
1518 }
1519
1520 unsigned int mpic_get_coreint_irq(void)
1521 {
1522 #ifdef CONFIG_BOOKE
1523         struct mpic *mpic = mpic_primary;
1524         u32 src;
1525
1526         BUG_ON(mpic == NULL);
1527
1528         src = mfspr(SPRN_EPR);
1529
1530         if (unlikely(src == mpic->spurious_vec)) {
1531                 if (mpic->flags & MPIC_SPV_EOI)
1532                         mpic_eoi(mpic);
1533                 return NO_IRQ;
1534         }
1535         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1536                 if (printk_ratelimit())
1537                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1538                                mpic->name, (int)src);
1539                 return NO_IRQ;
1540         }
1541
1542         return irq_linear_revmap(mpic->irqhost, src);
1543 #else
1544         return NO_IRQ;
1545 #endif
1546 }
1547
1548 unsigned int mpic_get_mcirq(void)
1549 {
1550         struct mpic *mpic = mpic_primary;
1551
1552         BUG_ON(mpic == NULL);
1553
1554         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1555 }
1556
1557 #ifdef CONFIG_SMP
1558 void mpic_request_ipis(void)
1559 {
1560         struct mpic *mpic = mpic_primary;
1561         int i;
1562         BUG_ON(mpic == NULL);
1563
1564         printk(KERN_INFO "mpic: requesting IPIs...\n");
1565
1566         for (i = 0; i < 4; i++) {
1567                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1568                                                        mpic->ipi_vecs[0] + i);
1569                 if (vipi == NO_IRQ) {
1570                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1571                         continue;
1572                 }
1573                 smp_request_message_ipi(vipi, i);
1574         }
1575 }
1576
1577 static void mpic_send_ipi(unsigned int ipi_no, const struct cpumask *cpu_mask)
1578 {
1579         struct mpic *mpic = mpic_primary;
1580
1581         BUG_ON(mpic == NULL);
1582
1583 #ifdef DEBUG_IPI
1584         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1585 #endif
1586
1587         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1588                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1589                        mpic_physmask(cpumask_bits(cpu_mask)[0]));
1590 }
1591
1592 void smp_mpic_message_pass(int target, int msg)
1593 {
1594         cpumask_var_t tmp;
1595
1596         /* make sure we're sending something that translates to an IPI */
1597         if ((unsigned int)msg > 3) {
1598                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1599                        smp_processor_id(), msg);
1600                 return;
1601         }
1602         switch (target) {
1603         case MSG_ALL:
1604                 mpic_send_ipi(msg, cpu_online_mask);
1605                 break;
1606         case MSG_ALL_BUT_SELF:
1607                 alloc_cpumask_var(&tmp, GFP_NOWAIT);
1608                 cpumask_andnot(tmp, cpu_online_mask,
1609                                cpumask_of(smp_processor_id()));
1610                 mpic_send_ipi(msg, tmp);
1611                 free_cpumask_var(tmp);
1612                 break;
1613         default:
1614                 mpic_send_ipi(msg, cpumask_of(target));
1615                 break;
1616         }
1617 }
1618
1619 int __init smp_mpic_probe(void)
1620 {
1621         int nr_cpus;
1622
1623         DBG("smp_mpic_probe()...\n");
1624
1625         nr_cpus = cpumask_weight(cpu_possible_mask);
1626
1627         DBG("nr_cpus: %d\n", nr_cpus);
1628
1629         if (nr_cpus > 1)
1630                 mpic_request_ipis();
1631
1632         return nr_cpus;
1633 }
1634
1635 void __devinit smp_mpic_setup_cpu(int cpu)
1636 {
1637         mpic_setup_this_cpu();
1638 }
1639
1640 void mpic_reset_core(int cpu)
1641 {
1642         struct mpic *mpic = mpic_primary;
1643         u32 pir;
1644         int cpuid = get_hard_smp_processor_id(cpu);
1645
1646         /* Set target bit for core reset */
1647         pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1648         pir |= (1 << cpuid);
1649         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1650         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1651
1652         /* Restore target bit after reset complete */
1653         pir &= ~(1 << cpuid);
1654         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1655         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1656 }
1657 #endif /* CONFIG_SMP */
1658
1659 #ifdef CONFIG_PM
1660 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1661 {
1662         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1663         int i;
1664
1665         for (i = 0; i < mpic->num_sources; i++) {
1666                 mpic->save_data[i].vecprio =
1667                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1668                 mpic->save_data[i].dest =
1669                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1670         }
1671
1672         return 0;
1673 }
1674
1675 static int mpic_resume(struct sys_device *dev)
1676 {
1677         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1678         int i;
1679
1680         for (i = 0; i < mpic->num_sources; i++) {
1681                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1682                                mpic->save_data[i].vecprio);
1683                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1684                                mpic->save_data[i].dest);
1685
1686 #ifdef CONFIG_MPIC_U3_HT_IRQS
1687         if (mpic->fixups) {
1688                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1689
1690                 if (fixup->base) {
1691                         /* we use the lowest bit in an inverted meaning */
1692                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1693                                 continue;
1694
1695                         /* Enable and configure */
1696                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1697
1698                         writel(mpic->save_data[i].fixup_data & ~1,
1699                                fixup->base + 4);
1700                 }
1701         }
1702 #endif
1703         } /* end for loop */
1704
1705         return 0;
1706 }
1707 #endif
1708
1709 static struct sysdev_class mpic_sysclass = {
1710 #ifdef CONFIG_PM
1711         .resume = mpic_resume,
1712         .suspend = mpic_suspend,
1713 #endif
1714         .name = "mpic",
1715 };
1716
1717 static int mpic_init_sys(void)
1718 {
1719         struct mpic *mpic = mpics;
1720         int error, id = 0;
1721
1722         error = sysdev_class_register(&mpic_sysclass);
1723
1724         while (mpic && !error) {
1725                 mpic->sysdev.cls = &mpic_sysclass;
1726                 mpic->sysdev.id = id++;
1727                 error = sysdev_register(&mpic->sysdev);
1728                 mpic = mpic->next;
1729         }
1730         return error;
1731 }
1732
1733 device_initcall(mpic_init_sys);