0afd21f9a2221f6b27826f13dac546e98dd7f6b9
[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
30 #include <asm/ptrace.h>
31 #include <asm/signal.h>
32 #include <asm/io.h>
33 #include <asm/pgtable.h>
34 #include <asm/irq.h>
35 #include <asm/machdep.h>
36 #include <asm/mpic.h>
37 #include <asm/smp.h>
38
39 #include "mpic.h"
40
41 #ifdef DEBUG
42 #define DBG(fmt...) printk(fmt)
43 #else
44 #define DBG(fmt...)
45 #endif
46
47 static struct mpic *mpics;
48 static struct mpic *mpic_primary;
49 static DEFINE_SPINLOCK(mpic_lock);
50
51 #ifdef CONFIG_PPC32     /* XXX for now */
52 #ifdef CONFIG_IRQ_ALL_CPUS
53 #define distribute_irqs (1)
54 #else
55 #define distribute_irqs (0)
56 #endif
57 #endif
58
59 #ifdef CONFIG_MPIC_WEIRD
60 static u32 mpic_infos[][MPIC_IDX_END] = {
61         [0] = { /* Original OpenPIC compatible MPIC */
62                 MPIC_GREG_BASE,
63                 MPIC_GREG_FEATURE_0,
64                 MPIC_GREG_GLOBAL_CONF_0,
65                 MPIC_GREG_VENDOR_ID,
66                 MPIC_GREG_IPI_VECTOR_PRI_0,
67                 MPIC_GREG_IPI_STRIDE,
68                 MPIC_GREG_SPURIOUS,
69                 MPIC_GREG_TIMER_FREQ,
70
71                 MPIC_TIMER_BASE,
72                 MPIC_TIMER_STRIDE,
73                 MPIC_TIMER_CURRENT_CNT,
74                 MPIC_TIMER_BASE_CNT,
75                 MPIC_TIMER_VECTOR_PRI,
76                 MPIC_TIMER_DESTINATION,
77
78                 MPIC_CPU_BASE,
79                 MPIC_CPU_STRIDE,
80                 MPIC_CPU_IPI_DISPATCH_0,
81                 MPIC_CPU_IPI_DISPATCH_STRIDE,
82                 MPIC_CPU_CURRENT_TASK_PRI,
83                 MPIC_CPU_WHOAMI,
84                 MPIC_CPU_INTACK,
85                 MPIC_CPU_EOI,
86                 MPIC_CPU_MCACK,
87
88                 MPIC_IRQ_BASE,
89                 MPIC_IRQ_STRIDE,
90                 MPIC_IRQ_VECTOR_PRI,
91                 MPIC_VECPRI_VECTOR_MASK,
92                 MPIC_VECPRI_POLARITY_POSITIVE,
93                 MPIC_VECPRI_POLARITY_NEGATIVE,
94                 MPIC_VECPRI_SENSE_LEVEL,
95                 MPIC_VECPRI_SENSE_EDGE,
96                 MPIC_VECPRI_POLARITY_MASK,
97                 MPIC_VECPRI_SENSE_MASK,
98                 MPIC_IRQ_DESTINATION
99         },
100         [1] = { /* Tsi108/109 PIC */
101                 TSI108_GREG_BASE,
102                 TSI108_GREG_FEATURE_0,
103                 TSI108_GREG_GLOBAL_CONF_0,
104                 TSI108_GREG_VENDOR_ID,
105                 TSI108_GREG_IPI_VECTOR_PRI_0,
106                 TSI108_GREG_IPI_STRIDE,
107                 TSI108_GREG_SPURIOUS,
108                 TSI108_GREG_TIMER_FREQ,
109
110                 TSI108_TIMER_BASE,
111                 TSI108_TIMER_STRIDE,
112                 TSI108_TIMER_CURRENT_CNT,
113                 TSI108_TIMER_BASE_CNT,
114                 TSI108_TIMER_VECTOR_PRI,
115                 TSI108_TIMER_DESTINATION,
116
117                 TSI108_CPU_BASE,
118                 TSI108_CPU_STRIDE,
119                 TSI108_CPU_IPI_DISPATCH_0,
120                 TSI108_CPU_IPI_DISPATCH_STRIDE,
121                 TSI108_CPU_CURRENT_TASK_PRI,
122                 TSI108_CPU_WHOAMI,
123                 TSI108_CPU_INTACK,
124                 TSI108_CPU_EOI,
125                 TSI108_CPU_MCACK,
126
127                 TSI108_IRQ_BASE,
128                 TSI108_IRQ_STRIDE,
129                 TSI108_IRQ_VECTOR_PRI,
130                 TSI108_VECPRI_VECTOR_MASK,
131                 TSI108_VECPRI_POLARITY_POSITIVE,
132                 TSI108_VECPRI_POLARITY_NEGATIVE,
133                 TSI108_VECPRI_SENSE_LEVEL,
134                 TSI108_VECPRI_SENSE_EDGE,
135                 TSI108_VECPRI_POLARITY_MASK,
136                 TSI108_VECPRI_SENSE_MASK,
137                 TSI108_IRQ_DESTINATION
138         },
139 };
140
141 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
142
143 #else /* CONFIG_MPIC_WEIRD */
144
145 #define MPIC_INFO(name) MPIC_##name
146
147 #endif /* CONFIG_MPIC_WEIRD */
148
149 /*
150  * Register accessor functions
151  */
152
153
154 static inline u32 _mpic_read(enum mpic_reg_type type,
155                              struct mpic_reg_bank *rb,
156                              unsigned int reg)
157 {
158         switch(type) {
159 #ifdef CONFIG_PPC_DCR
160         case mpic_access_dcr:
161                 return dcr_read(rb->dhost, reg);
162 #endif
163         case mpic_access_mmio_be:
164                 return in_be32(rb->base + (reg >> 2));
165         case mpic_access_mmio_le:
166         default:
167                 return in_le32(rb->base + (reg >> 2));
168         }
169 }
170
171 static inline void _mpic_write(enum mpic_reg_type type,
172                                struct mpic_reg_bank *rb,
173                                unsigned int reg, u32 value)
174 {
175         switch(type) {
176 #ifdef CONFIG_PPC_DCR
177         case mpic_access_dcr:
178                 dcr_write(rb->dhost, reg, value);
179                 break;
180 #endif
181         case mpic_access_mmio_be:
182                 out_be32(rb->base + (reg >> 2), value);
183                 break;
184         case mpic_access_mmio_le:
185         default:
186                 out_le32(rb->base + (reg >> 2), value);
187                 break;
188         }
189 }
190
191 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
192 {
193         enum mpic_reg_type type = mpic->reg_type;
194         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
195                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
196
197         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
198                 type = mpic_access_mmio_be;
199         return _mpic_read(type, &mpic->gregs, offset);
200 }
201
202 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
203 {
204         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
205                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
206
207         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
208 }
209
210 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
211 {
212         unsigned int cpu = 0;
213
214         if (mpic->flags & MPIC_PRIMARY)
215                 cpu = hard_smp_processor_id();
216         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
217 }
218
219 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
220 {
221         unsigned int cpu = 0;
222
223         if (mpic->flags & MPIC_PRIMARY)
224                 cpu = hard_smp_processor_id();
225
226         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
227 }
228
229 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
230 {
231         unsigned int    isu = src_no >> mpic->isu_shift;
232         unsigned int    idx = src_no & mpic->isu_mask;
233
234 #ifdef CONFIG_MPIC_BROKEN_REGREAD
235         if (reg == 0)
236                 return mpic->isu_reg0_shadow[idx];
237         else
238 #endif
239                 return _mpic_read(mpic->reg_type, &mpic->isus[isu],
240                                   reg + (idx * MPIC_INFO(IRQ_STRIDE)));
241 }
242
243 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
244                                    unsigned int reg, u32 value)
245 {
246         unsigned int    isu = src_no >> mpic->isu_shift;
247         unsigned int    idx = src_no & mpic->isu_mask;
248
249         _mpic_write(mpic->reg_type, &mpic->isus[isu],
250                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
251
252 #ifdef CONFIG_MPIC_BROKEN_REGREAD
253         if (reg == 0)
254                 mpic->isu_reg0_shadow[idx] = value;
255 #endif
256 }
257
258 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
259 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
260 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
261 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
262 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
263 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
264 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
265 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
266
267
268 /*
269  * Low level utility functions
270  */
271
272
273 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
274                            struct mpic_reg_bank *rb, unsigned int offset,
275                            unsigned int size)
276 {
277         rb->base = ioremap(phys_addr + offset, size);
278         BUG_ON(rb->base == NULL);
279 }
280
281 #ifdef CONFIG_PPC_DCR
282 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
283                           unsigned int offset, unsigned int size)
284 {
285         const u32 *dbasep;
286
287         dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL);
288
289         rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size);
290         BUG_ON(!DCR_MAP_OK(rb->dhost));
291 }
292
293 static inline void mpic_map(struct mpic *mpic, phys_addr_t phys_addr,
294                             struct mpic_reg_bank *rb, unsigned int offset,
295                             unsigned int size)
296 {
297         if (mpic->flags & MPIC_USES_DCR)
298                 _mpic_map_dcr(mpic, rb, offset, size);
299         else
300                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
301 }
302 #else /* CONFIG_PPC_DCR */
303 #define mpic_map(m,p,b,o,s)     _mpic_map_mmio(m,p,b,o,s)
304 #endif /* !CONFIG_PPC_DCR */
305
306
307
308 /* Check if we have one of those nice broken MPICs with a flipped endian on
309  * reads from IPI registers
310  */
311 static void __init mpic_test_broken_ipi(struct mpic *mpic)
312 {
313         u32 r;
314
315         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
316         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
317
318         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
319                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
320                 mpic->flags |= MPIC_BROKEN_IPI;
321         }
322 }
323
324 #ifdef CONFIG_MPIC_U3_HT_IRQS
325
326 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
327  * to force the edge setting on the MPIC and do the ack workaround.
328  */
329 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
330 {
331         if (source >= 128 || !mpic->fixups)
332                 return 0;
333         return mpic->fixups[source].base != NULL;
334 }
335
336
337 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
338 {
339         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
340
341         if (fixup->applebase) {
342                 unsigned int soff = (fixup->index >> 3) & ~3;
343                 unsigned int mask = 1U << (fixup->index & 0x1f);
344                 writel(mask, fixup->applebase + soff);
345         } else {
346                 spin_lock(&mpic->fixup_lock);
347                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
348                 writel(fixup->data, fixup->base + 4);
349                 spin_unlock(&mpic->fixup_lock);
350         }
351 }
352
353 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
354                                       unsigned int irqflags)
355 {
356         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
357         unsigned long flags;
358         u32 tmp;
359
360         if (fixup->base == NULL)
361                 return;
362
363         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
364             source, irqflags, fixup->index);
365         spin_lock_irqsave(&mpic->fixup_lock, flags);
366         /* Enable and configure */
367         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
368         tmp = readl(fixup->base + 4);
369         tmp &= ~(0x23U);
370         if (irqflags & IRQ_LEVEL)
371                 tmp |= 0x22;
372         writel(tmp, fixup->base + 4);
373         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
374
375 #ifdef CONFIG_PM
376         /* use the lowest bit inverted to the actual HW,
377          * set if this fixup was enabled, clear otherwise */
378         mpic->save_data[source].fixup_data = tmp | 1;
379 #endif
380 }
381
382 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
383                                        unsigned int irqflags)
384 {
385         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
386         unsigned long flags;
387         u32 tmp;
388
389         if (fixup->base == NULL)
390                 return;
391
392         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
393
394         /* Disable */
395         spin_lock_irqsave(&mpic->fixup_lock, flags);
396         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
397         tmp = readl(fixup->base + 4);
398         tmp |= 1;
399         writel(tmp, fixup->base + 4);
400         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
401
402 #ifdef CONFIG_PM
403         /* use the lowest bit inverted to the actual HW,
404          * set if this fixup was enabled, clear otherwise */
405         mpic->save_data[source].fixup_data = tmp & ~1;
406 #endif
407 }
408
409 #ifdef CONFIG_PCI_MSI
410 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
411                                     unsigned int devfn)
412 {
413         u8 __iomem *base;
414         u8 pos, flags;
415         u64 addr = 0;
416
417         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
418              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
419                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
420                 if (id == PCI_CAP_ID_HT) {
421                         id = readb(devbase + pos + 3);
422                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
423                                 break;
424                 }
425         }
426
427         if (pos == 0)
428                 return;
429
430         base = devbase + pos;
431
432         flags = readb(base + HT_MSI_FLAGS);
433         if (!(flags & HT_MSI_FLAGS_FIXED)) {
434                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
435                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
436         }
437
438         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%lx\n",
439                 PCI_SLOT(devfn), PCI_FUNC(devfn),
440                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
441
442         if (!(flags & HT_MSI_FLAGS_ENABLE))
443                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
444 }
445 #else
446 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
447                                     unsigned int devfn)
448 {
449         return;
450 }
451 #endif
452
453 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
454                                     unsigned int devfn, u32 vdid)
455 {
456         int i, irq, n;
457         u8 __iomem *base;
458         u32 tmp;
459         u8 pos;
460
461         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
462              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
463                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
464                 if (id == PCI_CAP_ID_HT) {
465                         id = readb(devbase + pos + 3);
466                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
467                                 break;
468                 }
469         }
470         if (pos == 0)
471                 return;
472
473         base = devbase + pos;
474         writeb(0x01, base + 2);
475         n = (readl(base + 4) >> 16) & 0xff;
476
477         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
478                " has %d irqs\n",
479                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
480
481         for (i = 0; i <= n; i++) {
482                 writeb(0x10 + 2 * i, base + 2);
483                 tmp = readl(base + 4);
484                 irq = (tmp >> 16) & 0xff;
485                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
486                 /* mask it , will be unmasked later */
487                 tmp |= 0x1;
488                 writel(tmp, base + 4);
489                 mpic->fixups[irq].index = i;
490                 mpic->fixups[irq].base = base;
491                 /* Apple HT PIC has a non-standard way of doing EOIs */
492                 if ((vdid & 0xffff) == 0x106b)
493                         mpic->fixups[irq].applebase = devbase + 0x60;
494                 else
495                         mpic->fixups[irq].applebase = NULL;
496                 writeb(0x11 + 2 * i, base + 2);
497                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
498         }
499 }
500  
501
502 static void __init mpic_scan_ht_pics(struct mpic *mpic)
503 {
504         unsigned int devfn;
505         u8 __iomem *cfgspace;
506
507         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
508
509         /* Allocate fixups array */
510         mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
511         BUG_ON(mpic->fixups == NULL);
512         memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
513
514         /* Init spinlock */
515         spin_lock_init(&mpic->fixup_lock);
516
517         /* Map U3 config space. We assume all IO-APICs are on the primary bus
518          * so we only need to map 64kB.
519          */
520         cfgspace = ioremap(0xf2000000, 0x10000);
521         BUG_ON(cfgspace == NULL);
522
523         /* Now we scan all slots. We do a very quick scan, we read the header
524          * type, vendor ID and device ID only, that's plenty enough
525          */
526         for (devfn = 0; devfn < 0x100; devfn++) {
527                 u8 __iomem *devbase = cfgspace + (devfn << 8);
528                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
529                 u32 l = readl(devbase + PCI_VENDOR_ID);
530                 u16 s;
531
532                 DBG("devfn %x, l: %x\n", devfn, l);
533
534                 /* If no device, skip */
535                 if (l == 0xffffffff || l == 0x00000000 ||
536                     l == 0x0000ffff || l == 0xffff0000)
537                         goto next;
538                 /* Check if is supports capability lists */
539                 s = readw(devbase + PCI_STATUS);
540                 if (!(s & PCI_STATUS_CAP_LIST))
541                         goto next;
542
543                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
544                 mpic_scan_ht_msi(mpic, devbase, devfn);
545
546         next:
547                 /* next device, if function 0 */
548                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
549                         devfn += 7;
550         }
551 }
552
553 #else /* CONFIG_MPIC_U3_HT_IRQS */
554
555 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
556 {
557         return 0;
558 }
559
560 static void __init mpic_scan_ht_pics(struct mpic *mpic)
561 {
562 }
563
564 #endif /* CONFIG_MPIC_U3_HT_IRQS */
565
566 #ifdef CONFIG_SMP
567 static int irq_choose_cpu(unsigned int virt_irq)
568 {
569         cpumask_t mask;
570         int cpuid;
571
572         cpumask_copy(&mask, irq_desc[virt_irq].affinity);
573         if (cpus_equal(mask, CPU_MASK_ALL)) {
574                 static int irq_rover;
575                 static DEFINE_SPINLOCK(irq_rover_lock);
576                 unsigned long flags;
577
578                 /* Round-robin distribution... */
579         do_round_robin:
580                 spin_lock_irqsave(&irq_rover_lock, flags);
581
582                 while (!cpu_online(irq_rover)) {
583                         if (++irq_rover >= NR_CPUS)
584                                 irq_rover = 0;
585                 }
586                 cpuid = irq_rover;
587                 do {
588                         if (++irq_rover >= NR_CPUS)
589                                 irq_rover = 0;
590                 } while (!cpu_online(irq_rover));
591
592                 spin_unlock_irqrestore(&irq_rover_lock, flags);
593         } else {
594                 cpumask_t tmp;
595
596                 cpus_and(tmp, cpu_online_map, mask);
597
598                 if (cpus_empty(tmp))
599                         goto do_round_robin;
600
601                 cpuid = first_cpu(tmp);
602         }
603
604         return get_hard_smp_processor_id(cpuid);
605 }
606 #else
607 static int irq_choose_cpu(unsigned int virt_irq)
608 {
609         return hard_smp_processor_id();
610 }
611 #endif
612
613 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
614
615 /* Find an mpic associated with a given linux interrupt */
616 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
617 {
618         unsigned int src = mpic_irq_to_hw(irq);
619         struct mpic *mpic;
620
621         if (irq < NUM_ISA_INTERRUPTS)
622                 return NULL;
623
624         mpic = irq_desc[irq].chip_data;
625
626         if (is_ipi)
627                 *is_ipi = (src >= mpic->ipi_vecs[0] &&
628                            src <= mpic->ipi_vecs[3]);
629
630         return mpic;
631 }
632
633 /* Convert a cpu mask from logical to physical cpu numbers. */
634 static inline u32 mpic_physmask(u32 cpumask)
635 {
636         int i;
637         u32 mask = 0;
638
639         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
640                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
641         return mask;
642 }
643
644 #ifdef CONFIG_SMP
645 /* Get the mpic structure from the IPI number */
646 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
647 {
648         return irq_desc[ipi].chip_data;
649 }
650 #endif
651
652 /* Get the mpic structure from the irq number */
653 static inline struct mpic * mpic_from_irq(unsigned int irq)
654 {
655         return irq_desc[irq].chip_data;
656 }
657
658 /* Send an EOI */
659 static inline void mpic_eoi(struct mpic *mpic)
660 {
661         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
662         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
663 }
664
665 /*
666  * Linux descriptor level callbacks
667  */
668
669
670 void mpic_unmask_irq(unsigned int irq)
671 {
672         unsigned int loops = 100000;
673         struct mpic *mpic = mpic_from_irq(irq);
674         unsigned int src = mpic_irq_to_hw(irq);
675
676         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
677
678         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
679                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
680                        ~MPIC_VECPRI_MASK);
681         /* make sure mask gets to controller before we return to user */
682         do {
683                 if (!loops--) {
684                         printk(KERN_ERR "mpic_enable_irq timeout\n");
685                         break;
686                 }
687         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
688 }
689
690 void mpic_mask_irq(unsigned int irq)
691 {
692         unsigned int loops = 100000;
693         struct mpic *mpic = mpic_from_irq(irq);
694         unsigned int src = mpic_irq_to_hw(irq);
695
696         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
697
698         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
699                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
700                        MPIC_VECPRI_MASK);
701
702         /* make sure mask gets to controller before we return to user */
703         do {
704                 if (!loops--) {
705                         printk(KERN_ERR "mpic_enable_irq timeout\n");
706                         break;
707                 }
708         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
709 }
710
711 void mpic_end_irq(unsigned int irq)
712 {
713         struct mpic *mpic = mpic_from_irq(irq);
714
715 #ifdef DEBUG_IRQ
716         DBG("%s: end_irq: %d\n", mpic->name, irq);
717 #endif
718         /* We always EOI on end_irq() even for edge interrupts since that
719          * should only lower the priority, the MPIC should have properly
720          * latched another edge interrupt coming in anyway
721          */
722
723         mpic_eoi(mpic);
724 }
725
726 #ifdef CONFIG_MPIC_U3_HT_IRQS
727
728 static void mpic_unmask_ht_irq(unsigned int irq)
729 {
730         struct mpic *mpic = mpic_from_irq(irq);
731         unsigned int src = mpic_irq_to_hw(irq);
732
733         mpic_unmask_irq(irq);
734
735         if (irq_desc[irq].status & IRQ_LEVEL)
736                 mpic_ht_end_irq(mpic, src);
737 }
738
739 static unsigned int mpic_startup_ht_irq(unsigned int irq)
740 {
741         struct mpic *mpic = mpic_from_irq(irq);
742         unsigned int src = mpic_irq_to_hw(irq);
743
744         mpic_unmask_irq(irq);
745         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
746
747         return 0;
748 }
749
750 static void mpic_shutdown_ht_irq(unsigned int irq)
751 {
752         struct mpic *mpic = mpic_from_irq(irq);
753         unsigned int src = mpic_irq_to_hw(irq);
754
755         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
756         mpic_mask_irq(irq);
757 }
758
759 static void mpic_end_ht_irq(unsigned int irq)
760 {
761         struct mpic *mpic = mpic_from_irq(irq);
762         unsigned int src = mpic_irq_to_hw(irq);
763
764 #ifdef DEBUG_IRQ
765         DBG("%s: end_irq: %d\n", mpic->name, irq);
766 #endif
767         /* We always EOI on end_irq() even for edge interrupts since that
768          * should only lower the priority, the MPIC should have properly
769          * latched another edge interrupt coming in anyway
770          */
771
772         if (irq_desc[irq].status & IRQ_LEVEL)
773                 mpic_ht_end_irq(mpic, src);
774         mpic_eoi(mpic);
775 }
776 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
777
778 #ifdef CONFIG_SMP
779
780 static void mpic_unmask_ipi(unsigned int irq)
781 {
782         struct mpic *mpic = mpic_from_ipi(irq);
783         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
784
785         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
786         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
787 }
788
789 static void mpic_mask_ipi(unsigned int irq)
790 {
791         /* NEVER disable an IPI... that's just plain wrong! */
792 }
793
794 static void mpic_end_ipi(unsigned int irq)
795 {
796         struct mpic *mpic = mpic_from_ipi(irq);
797
798         /*
799          * IPIs are marked IRQ_PER_CPU. This has the side effect of
800          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
801          * applying to them. We EOI them late to avoid re-entering.
802          * We mark IPI's with IRQF_DISABLED as they must run with
803          * irqs disabled.
804          */
805         mpic_eoi(mpic);
806 }
807
808 #endif /* CONFIG_SMP */
809
810 void mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
811 {
812         struct mpic *mpic = mpic_from_irq(irq);
813         unsigned int src = mpic_irq_to_hw(irq);
814
815         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
816                 int cpuid = irq_choose_cpu(irq);
817
818                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
819         } else {
820                 cpumask_t tmp;
821
822                 cpumask_and(&tmp, cpumask, cpu_online_mask);
823
824                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
825                                mpic_physmask(cpus_addr(tmp)[0]));
826         }
827 }
828
829 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
830 {
831         /* Now convert sense value */
832         switch(type & IRQ_TYPE_SENSE_MASK) {
833         case IRQ_TYPE_EDGE_RISING:
834                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
835                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
836         case IRQ_TYPE_EDGE_FALLING:
837         case IRQ_TYPE_EDGE_BOTH:
838                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
839                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
840         case IRQ_TYPE_LEVEL_HIGH:
841                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
842                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
843         case IRQ_TYPE_LEVEL_LOW:
844         default:
845                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
846                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
847         }
848 }
849
850 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
851 {
852         struct mpic *mpic = mpic_from_irq(virq);
853         unsigned int src = mpic_irq_to_hw(virq);
854         struct irq_desc *desc = get_irq_desc(virq);
855         unsigned int vecpri, vold, vnew;
856
857         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
858             mpic, virq, src, flow_type);
859
860         if (src >= mpic->irq_count)
861                 return -EINVAL;
862
863         if (flow_type == IRQ_TYPE_NONE)
864                 if (mpic->senses && src < mpic->senses_count)
865                         flow_type = mpic->senses[src];
866         if (flow_type == IRQ_TYPE_NONE)
867                 flow_type = IRQ_TYPE_LEVEL_LOW;
868
869         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
870         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
871         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
872                 desc->status |= IRQ_LEVEL;
873
874         if (mpic_is_ht_interrupt(mpic, src))
875                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
876                         MPIC_VECPRI_SENSE_EDGE;
877         else
878                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
879
880         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
881         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
882                         MPIC_INFO(VECPRI_SENSE_MASK));
883         vnew |= vecpri;
884         if (vold != vnew)
885                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
886
887         return 0;
888 }
889
890 void mpic_set_vector(unsigned int virq, unsigned int vector)
891 {
892         struct mpic *mpic = mpic_from_irq(virq);
893         unsigned int src = mpic_irq_to_hw(virq);
894         unsigned int vecpri;
895
896         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
897             mpic, virq, src, vector);
898
899         if (src >= mpic->irq_count)
900                 return;
901
902         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
903         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
904         vecpri |= vector;
905         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
906 }
907
908 static struct irq_chip mpic_irq_chip = {
909         .mask           = mpic_mask_irq,
910         .unmask         = mpic_unmask_irq,
911         .eoi            = mpic_end_irq,
912         .set_type       = mpic_set_irq_type,
913 };
914
915 #ifdef CONFIG_SMP
916 static struct irq_chip mpic_ipi_chip = {
917         .mask           = mpic_mask_ipi,
918         .unmask         = mpic_unmask_ipi,
919         .eoi            = mpic_end_ipi,
920 };
921 #endif /* CONFIG_SMP */
922
923 #ifdef CONFIG_MPIC_U3_HT_IRQS
924 static struct irq_chip mpic_irq_ht_chip = {
925         .startup        = mpic_startup_ht_irq,
926         .shutdown       = mpic_shutdown_ht_irq,
927         .mask           = mpic_mask_irq,
928         .unmask         = mpic_unmask_ht_irq,
929         .eoi            = mpic_end_ht_irq,
930         .set_type       = mpic_set_irq_type,
931 };
932 #endif /* CONFIG_MPIC_U3_HT_IRQS */
933
934
935 static int mpic_host_match(struct irq_host *h, struct device_node *node)
936 {
937         /* Exact match, unless mpic node is NULL */
938         return h->of_node == NULL || h->of_node == node;
939 }
940
941 static int mpic_host_map(struct irq_host *h, unsigned int virq,
942                          irq_hw_number_t hw)
943 {
944         struct mpic *mpic = h->host_data;
945         struct irq_chip *chip;
946
947         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
948
949         if (hw == mpic->spurious_vec)
950                 return -EINVAL;
951         if (mpic->protected && test_bit(hw, mpic->protected))
952                 return -EINVAL;
953
954 #ifdef CONFIG_SMP
955         else if (hw >= mpic->ipi_vecs[0]) {
956                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
957
958                 DBG("mpic: mapping as IPI\n");
959                 set_irq_chip_data(virq, mpic);
960                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
961                                          handle_percpu_irq);
962                 return 0;
963         }
964 #endif /* CONFIG_SMP */
965
966         if (hw >= mpic->irq_count)
967                 return -EINVAL;
968
969         mpic_msi_reserve_hwirq(mpic, hw);
970
971         /* Default chip */
972         chip = &mpic->hc_irq;
973
974 #ifdef CONFIG_MPIC_U3_HT_IRQS
975         /* Check for HT interrupts, override vecpri */
976         if (mpic_is_ht_interrupt(mpic, hw))
977                 chip = &mpic->hc_ht_irq;
978 #endif /* CONFIG_MPIC_U3_HT_IRQS */
979
980         DBG("mpic: mapping to irq chip @%p\n", chip);
981
982         set_irq_chip_data(virq, mpic);
983         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
984
985         /* Set default irq type */
986         set_irq_type(virq, IRQ_TYPE_NONE);
987
988         return 0;
989 }
990
991 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
992                            u32 *intspec, unsigned int intsize,
993                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
994
995 {
996         static unsigned char map_mpic_senses[4] = {
997                 IRQ_TYPE_EDGE_RISING,
998                 IRQ_TYPE_LEVEL_LOW,
999                 IRQ_TYPE_LEVEL_HIGH,
1000                 IRQ_TYPE_EDGE_FALLING,
1001         };
1002
1003         *out_hwirq = intspec[0];
1004         if (intsize > 1) {
1005                 u32 mask = 0x3;
1006
1007                 /* Apple invented a new race of encoding on machines with
1008                  * an HT APIC. They encode, among others, the index within
1009                  * the HT APIC. We don't care about it here since thankfully,
1010                  * it appears that they have the APIC already properly
1011                  * configured, and thus our current fixup code that reads the
1012                  * APIC config works fine. However, we still need to mask out
1013                  * bits in the specifier to make sure we only get bit 0 which
1014                  * is the level/edge bit (the only sense bit exposed by Apple),
1015                  * as their bit 1 means something else.
1016                  */
1017                 if (machine_is(powermac))
1018                         mask = 0x1;
1019                 *out_flags = map_mpic_senses[intspec[1] & mask];
1020         } else
1021                 *out_flags = IRQ_TYPE_NONE;
1022
1023         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1024             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1025
1026         return 0;
1027 }
1028
1029 static struct irq_host_ops mpic_host_ops = {
1030         .match = mpic_host_match,
1031         .map = mpic_host_map,
1032         .xlate = mpic_host_xlate,
1033 };
1034
1035 /*
1036  * Exported functions
1037  */
1038
1039 struct mpic * __init mpic_alloc(struct device_node *node,
1040                                 phys_addr_t phys_addr,
1041                                 unsigned int flags,
1042                                 unsigned int isu_size,
1043                                 unsigned int irq_count,
1044                                 const char *name)
1045 {
1046         struct mpic     *mpic;
1047         u32             greg_feature;
1048         const char      *vers;
1049         int             i;
1050         int             intvec_top;
1051         u64             paddr = phys_addr;
1052
1053         mpic = alloc_bootmem(sizeof(struct mpic));
1054         if (mpic == NULL)
1055                 return NULL;
1056         
1057         memset(mpic, 0, sizeof(struct mpic));
1058         mpic->name = name;
1059
1060         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1061                                        isu_size, &mpic_host_ops,
1062                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1063         if (mpic->irqhost == NULL)
1064                 return NULL;
1065
1066         mpic->irqhost->host_data = mpic;
1067         mpic->hc_irq = mpic_irq_chip;
1068         mpic->hc_irq.typename = name;
1069         if (flags & MPIC_PRIMARY)
1070                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1071 #ifdef CONFIG_MPIC_U3_HT_IRQS
1072         mpic->hc_ht_irq = mpic_irq_ht_chip;
1073         mpic->hc_ht_irq.typename = name;
1074         if (flags & MPIC_PRIMARY)
1075                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1076 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1077
1078 #ifdef CONFIG_SMP
1079         mpic->hc_ipi = mpic_ipi_chip;
1080         mpic->hc_ipi.typename = name;
1081 #endif /* CONFIG_SMP */
1082
1083         mpic->flags = flags;
1084         mpic->isu_size = isu_size;
1085         mpic->irq_count = irq_count;
1086         mpic->num_sources = 0; /* so far */
1087
1088         if (flags & MPIC_LARGE_VECTORS)
1089                 intvec_top = 2047;
1090         else
1091                 intvec_top = 255;
1092
1093         mpic->timer_vecs[0] = intvec_top - 8;
1094         mpic->timer_vecs[1] = intvec_top - 7;
1095         mpic->timer_vecs[2] = intvec_top - 6;
1096         mpic->timer_vecs[3] = intvec_top - 5;
1097         mpic->ipi_vecs[0]   = intvec_top - 4;
1098         mpic->ipi_vecs[1]   = intvec_top - 3;
1099         mpic->ipi_vecs[2]   = intvec_top - 2;
1100         mpic->ipi_vecs[3]   = intvec_top - 1;
1101         mpic->spurious_vec  = intvec_top;
1102
1103         /* Check for "big-endian" in device-tree */
1104         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1105                 mpic->flags |= MPIC_BIG_ENDIAN;
1106
1107         /* Look for protected sources */
1108         if (node) {
1109                 int psize;
1110                 unsigned int bits, mapsize;
1111                 const u32 *psrc =
1112                         of_get_property(node, "protected-sources", &psize);
1113                 if (psrc) {
1114                         psize /= 4;
1115                         bits = intvec_top + 1;
1116                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1117                         mpic->protected = alloc_bootmem(mapsize);
1118                         BUG_ON(mpic->protected == NULL);
1119                         memset(mpic->protected, 0, mapsize);
1120                         for (i = 0; i < psize; i++) {
1121                                 if (psrc[i] > intvec_top)
1122                                         continue;
1123                                 __set_bit(psrc[i], mpic->protected);
1124                         }
1125                 }
1126         }
1127
1128 #ifdef CONFIG_MPIC_WEIRD
1129         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1130 #endif
1131
1132         /* default register type */
1133         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1134                 mpic_access_mmio_be : mpic_access_mmio_le;
1135
1136         /* If no physical address is passed in, a device-node is mandatory */
1137         BUG_ON(paddr == 0 && node == NULL);
1138
1139         /* If no physical address passed in, check if it's dcr based */
1140         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1141 #ifdef CONFIG_PPC_DCR
1142                 mpic->flags |= MPIC_USES_DCR;
1143                 mpic->reg_type = mpic_access_dcr;
1144 #else
1145                 BUG();
1146 #endif /* CONFIG_PPC_DCR */
1147         }
1148
1149         /* If the MPIC is not DCR based, and no physical address was passed
1150          * in, try to obtain one
1151          */
1152         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1153                 const u32 *reg = of_get_property(node, "reg", NULL);
1154                 BUG_ON(reg == NULL);
1155                 paddr = of_translate_address(node, reg);
1156                 BUG_ON(paddr == OF_BAD_ADDR);
1157         }
1158
1159         /* Map the global registers */
1160         mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1161         mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1162
1163         /* Reset */
1164         if (flags & MPIC_WANTS_RESET) {
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_RESET);
1168                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1169                        & MPIC_GREG_GCONF_RESET)
1170                         mb();
1171         }
1172
1173         if (flags & MPIC_ENABLE_MCK)
1174                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1175                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1176                            | MPIC_GREG_GCONF_MCK);
1177
1178         /* Read feature register, calculate num CPUs and, for non-ISU
1179          * MPICs, num sources as well. On ISU MPICs, sources are counted
1180          * as ISUs are added
1181          */
1182         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1183         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1184                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1185         if (isu_size == 0) {
1186                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1187                         mpic->num_sources = mpic->irq_count;
1188                 else
1189                         mpic->num_sources =
1190                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1191                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1192         }
1193
1194         /* Map the per-CPU registers */
1195         for (i = 0; i < mpic->num_cpus; i++) {
1196                 mpic_map(mpic, paddr, &mpic->cpuregs[i],
1197                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1198                          0x1000);
1199         }
1200
1201         /* Initialize main ISU if none provided */
1202         if (mpic->isu_size == 0) {
1203                 mpic->isu_size = mpic->num_sources;
1204                 mpic_map(mpic, paddr, &mpic->isus[0],
1205                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1206         }
1207         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1208         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1209
1210         /* Display version */
1211         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1212         case 1:
1213                 vers = "1.0";
1214                 break;
1215         case 2:
1216                 vers = "1.2";
1217                 break;
1218         case 3:
1219                 vers = "1.3";
1220                 break;
1221         default:
1222                 vers = "<unknown>";
1223                 break;
1224         }
1225         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1226                " max %d CPUs\n",
1227                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1228         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1229                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1230
1231         mpic->next = mpics;
1232         mpics = mpic;
1233
1234         if (flags & MPIC_PRIMARY) {
1235                 mpic_primary = mpic;
1236                 irq_set_default_host(mpic->irqhost);
1237         }
1238
1239         return mpic;
1240 }
1241
1242 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1243                             phys_addr_t paddr)
1244 {
1245         unsigned int isu_first = isu_num * mpic->isu_size;
1246
1247         BUG_ON(isu_num >= MPIC_MAX_ISU);
1248
1249         mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
1250                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1251         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1252                 mpic->num_sources = isu_first + mpic->isu_size;
1253 }
1254
1255 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1256 {
1257         mpic->senses = senses;
1258         mpic->senses_count = count;
1259 }
1260
1261 void __init mpic_init(struct mpic *mpic)
1262 {
1263         int i;
1264         int cpu;
1265
1266         BUG_ON(mpic->num_sources == 0);
1267
1268         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1269
1270         /* Set current processor priority to max */
1271         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1272
1273         /* Initialize timers: just disable them all */
1274         for (i = 0; i < 4; i++) {
1275                 mpic_write(mpic->tmregs,
1276                            i * MPIC_INFO(TIMER_STRIDE) +
1277                            MPIC_INFO(TIMER_DESTINATION), 0);
1278                 mpic_write(mpic->tmregs,
1279                            i * MPIC_INFO(TIMER_STRIDE) +
1280                            MPIC_INFO(TIMER_VECTOR_PRI),
1281                            MPIC_VECPRI_MASK |
1282                            (mpic->timer_vecs[0] + i));
1283         }
1284
1285         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1286         mpic_test_broken_ipi(mpic);
1287         for (i = 0; i < 4; i++) {
1288                 mpic_ipi_write(i,
1289                                MPIC_VECPRI_MASK |
1290                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1291                                (mpic->ipi_vecs[0] + i));
1292         }
1293
1294         /* Initialize interrupt sources */
1295         if (mpic->irq_count == 0)
1296                 mpic->irq_count = mpic->num_sources;
1297
1298         /* Do the HT PIC fixups on U3 broken mpic */
1299         DBG("MPIC flags: %x\n", mpic->flags);
1300         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1301                 mpic_scan_ht_pics(mpic);
1302                 mpic_u3msi_init(mpic);
1303         }
1304
1305         mpic_pasemi_msi_init(mpic);
1306
1307         if (mpic->flags & MPIC_PRIMARY)
1308                 cpu = hard_smp_processor_id();
1309         else
1310                 cpu = 0;
1311
1312         for (i = 0; i < mpic->num_sources; i++) {
1313                 /* start with vector = source number, and masked */
1314                 u32 vecpri = MPIC_VECPRI_MASK | i |
1315                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1316                 
1317                 /* check if protected */
1318                 if (mpic->protected && test_bit(i, mpic->protected))
1319                         continue;
1320                 /* init hw */
1321                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1322                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1323         }
1324         
1325         /* Init spurious vector */
1326         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1327
1328         /* Disable 8259 passthrough, if supported */
1329         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1330                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1331                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1332                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1333
1334         if (mpic->flags & MPIC_NO_BIAS)
1335                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1336                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1337                         | MPIC_GREG_GCONF_NO_BIAS);
1338
1339         /* Set current processor priority to 0 */
1340         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1341
1342 #ifdef CONFIG_PM
1343         /* allocate memory to save mpic state */
1344         mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save));
1345         BUG_ON(mpic->save_data == NULL);
1346 #endif
1347 }
1348
1349 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1350 {
1351         u32 v;
1352
1353         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1354         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1355         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1356         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1357 }
1358
1359 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1360 {
1361         unsigned long flags;
1362         u32 v;
1363
1364         spin_lock_irqsave(&mpic_lock, flags);
1365         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1366         if (enable)
1367                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1368         else
1369                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1370         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1371         spin_unlock_irqrestore(&mpic_lock, flags);
1372 }
1373
1374 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1375 {
1376         unsigned int is_ipi;
1377         struct mpic *mpic = mpic_find(irq, &is_ipi);
1378         unsigned int src = mpic_irq_to_hw(irq);
1379         unsigned long flags;
1380         u32 reg;
1381
1382         if (!mpic)
1383                 return;
1384
1385         spin_lock_irqsave(&mpic_lock, flags);
1386         if (is_ipi) {
1387                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1388                         ~MPIC_VECPRI_PRIORITY_MASK;
1389                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1390                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1391         } else {
1392                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1393                         & ~MPIC_VECPRI_PRIORITY_MASK;
1394                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1395                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1396         }
1397         spin_unlock_irqrestore(&mpic_lock, flags);
1398 }
1399
1400 void mpic_setup_this_cpu(void)
1401 {
1402 #ifdef CONFIG_SMP
1403         struct mpic *mpic = mpic_primary;
1404         unsigned long flags;
1405         u32 msk = 1 << hard_smp_processor_id();
1406         unsigned int i;
1407
1408         BUG_ON(mpic == NULL);
1409
1410         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1411
1412         spin_lock_irqsave(&mpic_lock, flags);
1413
1414         /* let the mpic know we want intrs. default affinity is 0xffffffff
1415          * until changed via /proc. That's how it's done on x86. If we want
1416          * it differently, then we should make sure we also change the default
1417          * values of irq_desc[].affinity in irq.c.
1418          */
1419         if (distribute_irqs) {
1420                 for (i = 0; i < mpic->num_sources ; i++)
1421                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1422                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1423         }
1424
1425         /* Set current processor priority to 0 */
1426         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1427
1428         spin_unlock_irqrestore(&mpic_lock, flags);
1429 #endif /* CONFIG_SMP */
1430 }
1431
1432 int mpic_cpu_get_priority(void)
1433 {
1434         struct mpic *mpic = mpic_primary;
1435
1436         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1437 }
1438
1439 void mpic_cpu_set_priority(int prio)
1440 {
1441         struct mpic *mpic = mpic_primary;
1442
1443         prio &= MPIC_CPU_TASKPRI_MASK;
1444         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1445 }
1446
1447 void mpic_teardown_this_cpu(int secondary)
1448 {
1449         struct mpic *mpic = mpic_primary;
1450         unsigned long flags;
1451         u32 msk = 1 << hard_smp_processor_id();
1452         unsigned int i;
1453
1454         BUG_ON(mpic == NULL);
1455
1456         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1457         spin_lock_irqsave(&mpic_lock, flags);
1458
1459         /* let the mpic know we don't want intrs.  */
1460         for (i = 0; i < mpic->num_sources ; i++)
1461                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1462                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1463
1464         /* Set current processor priority to max */
1465         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1466         /* We need to EOI the IPI since not all platforms reset the MPIC
1467          * on boot and new interrupts wouldn't get delivered otherwise.
1468          */
1469         mpic_eoi(mpic);
1470
1471         spin_unlock_irqrestore(&mpic_lock, flags);
1472 }
1473
1474
1475 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1476 {
1477         struct mpic *mpic = mpic_primary;
1478
1479         BUG_ON(mpic == NULL);
1480
1481 #ifdef DEBUG_IPI
1482         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1483 #endif
1484
1485         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1486                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1487                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1488 }
1489
1490 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1491 {
1492         u32 src;
1493
1494         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1495 #ifdef DEBUG_LOW
1496         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1497 #endif
1498         if (unlikely(src == mpic->spurious_vec)) {
1499                 if (mpic->flags & MPIC_SPV_EOI)
1500                         mpic_eoi(mpic);
1501                 return NO_IRQ;
1502         }
1503         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1504                 if (printk_ratelimit())
1505                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1506                                mpic->name, (int)src);
1507                 mpic_eoi(mpic);
1508                 return NO_IRQ;
1509         }
1510
1511         return irq_linear_revmap(mpic->irqhost, src);
1512 }
1513
1514 unsigned int mpic_get_one_irq(struct mpic *mpic)
1515 {
1516         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1517 }
1518
1519 unsigned int mpic_get_irq(void)
1520 {
1521         struct mpic *mpic = mpic_primary;
1522
1523         BUG_ON(mpic == NULL);
1524
1525         return mpic_get_one_irq(mpic);
1526 }
1527
1528 unsigned int mpic_get_mcirq(void)
1529 {
1530         struct mpic *mpic = mpic_primary;
1531
1532         BUG_ON(mpic == NULL);
1533
1534         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1535 }
1536
1537 #ifdef CONFIG_SMP
1538 void mpic_request_ipis(void)
1539 {
1540         struct mpic *mpic = mpic_primary;
1541         int i;
1542         BUG_ON(mpic == NULL);
1543
1544         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1545
1546         for (i = 0; i < 4; i++) {
1547                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1548                                                        mpic->ipi_vecs[0] + i);
1549                 if (vipi == NO_IRQ) {
1550                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1551                         continue;
1552                 }
1553                 smp_request_message_ipi(vipi, i);
1554         }
1555 }
1556
1557 void smp_mpic_message_pass(int target, int msg)
1558 {
1559         /* make sure we're sending something that translates to an IPI */
1560         if ((unsigned int)msg > 3) {
1561                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1562                        smp_processor_id(), msg);
1563                 return;
1564         }
1565         switch (target) {
1566         case MSG_ALL:
1567                 mpic_send_ipi(msg, 0xffffffff);
1568                 break;
1569         case MSG_ALL_BUT_SELF:
1570                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1571                 break;
1572         default:
1573                 mpic_send_ipi(msg, 1 << target);
1574                 break;
1575         }
1576 }
1577
1578 int __init smp_mpic_probe(void)
1579 {
1580         int nr_cpus;
1581
1582         DBG("smp_mpic_probe()...\n");
1583
1584         nr_cpus = cpus_weight(cpu_possible_map);
1585
1586         DBG("nr_cpus: %d\n", nr_cpus);
1587
1588         if (nr_cpus > 1)
1589                 mpic_request_ipis();
1590
1591         return nr_cpus;
1592 }
1593
1594 void __devinit smp_mpic_setup_cpu(int cpu)
1595 {
1596         mpic_setup_this_cpu();
1597 }
1598 #endif /* CONFIG_SMP */
1599
1600 #ifdef CONFIG_PM
1601 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1602 {
1603         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1604         int i;
1605
1606         for (i = 0; i < mpic->num_sources; i++) {
1607                 mpic->save_data[i].vecprio =
1608                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1609                 mpic->save_data[i].dest =
1610                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1611         }
1612
1613         return 0;
1614 }
1615
1616 static int mpic_resume(struct sys_device *dev)
1617 {
1618         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1619         int i;
1620
1621         for (i = 0; i < mpic->num_sources; i++) {
1622                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1623                                mpic->save_data[i].vecprio);
1624                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1625                                mpic->save_data[i].dest);
1626
1627 #ifdef CONFIG_MPIC_U3_HT_IRQS
1628         {
1629                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1630
1631                 if (fixup->base) {
1632                         /* we use the lowest bit in an inverted meaning */
1633                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1634                                 continue;
1635
1636                         /* Enable and configure */
1637                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1638
1639                         writel(mpic->save_data[i].fixup_data & ~1,
1640                                fixup->base + 4);
1641                 }
1642         }
1643 #endif
1644         } /* end for loop */
1645
1646         return 0;
1647 }
1648 #endif
1649
1650 static struct sysdev_class mpic_sysclass = {
1651 #ifdef CONFIG_PM
1652         .resume = mpic_resume,
1653         .suspend = mpic_suspend,
1654 #endif
1655         .name = "mpic",
1656 };
1657
1658 static int mpic_init_sys(void)
1659 {
1660         struct mpic *mpic = mpics;
1661         int error, id = 0;
1662
1663         error = sysdev_class_register(&mpic_sysclass);
1664
1665         while (mpic && !error) {
1666                 mpic->sysdev.cls = &mpic_sysclass;
1667                 mpic->sysdev.id = id++;
1668                 error = sysdev_register(&mpic->sysdev);
1669                 mpic = mpic->next;
1670         }
1671         return error;
1672 }
1673
1674 device_initcall(mpic_init_sys);