[POWERPC] MPIC: Minor optimization of ipi handler
[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
87                 MPIC_IRQ_BASE,
88                 MPIC_IRQ_STRIDE,
89                 MPIC_IRQ_VECTOR_PRI,
90                 MPIC_VECPRI_VECTOR_MASK,
91                 MPIC_VECPRI_POLARITY_POSITIVE,
92                 MPIC_VECPRI_POLARITY_NEGATIVE,
93                 MPIC_VECPRI_SENSE_LEVEL,
94                 MPIC_VECPRI_SENSE_EDGE,
95                 MPIC_VECPRI_POLARITY_MASK,
96                 MPIC_VECPRI_SENSE_MASK,
97                 MPIC_IRQ_DESTINATION
98         },
99         [1] = { /* Tsi108/109 PIC */
100                 TSI108_GREG_BASE,
101                 TSI108_GREG_FEATURE_0,
102                 TSI108_GREG_GLOBAL_CONF_0,
103                 TSI108_GREG_VENDOR_ID,
104                 TSI108_GREG_IPI_VECTOR_PRI_0,
105                 TSI108_GREG_IPI_STRIDE,
106                 TSI108_GREG_SPURIOUS,
107                 TSI108_GREG_TIMER_FREQ,
108
109                 TSI108_TIMER_BASE,
110                 TSI108_TIMER_STRIDE,
111                 TSI108_TIMER_CURRENT_CNT,
112                 TSI108_TIMER_BASE_CNT,
113                 TSI108_TIMER_VECTOR_PRI,
114                 TSI108_TIMER_DESTINATION,
115
116                 TSI108_CPU_BASE,
117                 TSI108_CPU_STRIDE,
118                 TSI108_CPU_IPI_DISPATCH_0,
119                 TSI108_CPU_IPI_DISPATCH_STRIDE,
120                 TSI108_CPU_CURRENT_TASK_PRI,
121                 TSI108_CPU_WHOAMI,
122                 TSI108_CPU_INTACK,
123                 TSI108_CPU_EOI,
124
125                 TSI108_IRQ_BASE,
126                 TSI108_IRQ_STRIDE,
127                 TSI108_IRQ_VECTOR_PRI,
128                 TSI108_VECPRI_VECTOR_MASK,
129                 TSI108_VECPRI_POLARITY_POSITIVE,
130                 TSI108_VECPRI_POLARITY_NEGATIVE,
131                 TSI108_VECPRI_SENSE_LEVEL,
132                 TSI108_VECPRI_SENSE_EDGE,
133                 TSI108_VECPRI_POLARITY_MASK,
134                 TSI108_VECPRI_SENSE_MASK,
135                 TSI108_IRQ_DESTINATION
136         },
137 };
138
139 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
140
141 #else /* CONFIG_MPIC_WEIRD */
142
143 #define MPIC_INFO(name) MPIC_##name
144
145 #endif /* CONFIG_MPIC_WEIRD */
146
147 /*
148  * Register accessor functions
149  */
150
151
152 static inline u32 _mpic_read(enum mpic_reg_type type,
153                              struct mpic_reg_bank *rb,
154                              unsigned int reg)
155 {
156         switch(type) {
157 #ifdef CONFIG_PPC_DCR
158         case mpic_access_dcr:
159                 return dcr_read(rb->dhost, reg);
160 #endif
161         case mpic_access_mmio_be:
162                 return in_be32(rb->base + (reg >> 2));
163         case mpic_access_mmio_le:
164         default:
165                 return in_le32(rb->base + (reg >> 2));
166         }
167 }
168
169 static inline void _mpic_write(enum mpic_reg_type type,
170                                struct mpic_reg_bank *rb,
171                                unsigned int reg, u32 value)
172 {
173         switch(type) {
174 #ifdef CONFIG_PPC_DCR
175         case mpic_access_dcr:
176                 return dcr_write(rb->dhost, reg, value);
177 #endif
178         case mpic_access_mmio_be:
179                 return out_be32(rb->base + (reg >> 2), value);
180         case mpic_access_mmio_le:
181         default:
182                 return out_le32(rb->base + (reg >> 2), value);
183         }
184 }
185
186 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
187 {
188         enum mpic_reg_type type = mpic->reg_type;
189         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
190                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
191
192         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
193                 type = mpic_access_mmio_be;
194         return _mpic_read(type, &mpic->gregs, offset);
195 }
196
197 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
198 {
199         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
200                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
201
202         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
203 }
204
205 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
206 {
207         unsigned int cpu = 0;
208
209         if (mpic->flags & MPIC_PRIMARY)
210                 cpu = hard_smp_processor_id();
211         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
212 }
213
214 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
215 {
216         unsigned int cpu = 0;
217
218         if (mpic->flags & MPIC_PRIMARY)
219                 cpu = hard_smp_processor_id();
220
221         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
222 }
223
224 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
225 {
226         unsigned int    isu = src_no >> mpic->isu_shift;
227         unsigned int    idx = src_no & mpic->isu_mask;
228
229 #ifdef CONFIG_MPIC_BROKEN_REGREAD
230         if (reg == 0)
231                 return mpic->isu_reg0_shadow[idx];
232         else
233 #endif
234                 return _mpic_read(mpic->reg_type, &mpic->isus[isu],
235                                   reg + (idx * MPIC_INFO(IRQ_STRIDE)));
236 }
237
238 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
239                                    unsigned int reg, u32 value)
240 {
241         unsigned int    isu = src_no >> mpic->isu_shift;
242         unsigned int    idx = src_no & mpic->isu_mask;
243
244         _mpic_write(mpic->reg_type, &mpic->isus[isu],
245                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
246
247 #ifdef CONFIG_MPIC_BROKEN_REGREAD
248         if (reg == 0)
249                 mpic->isu_reg0_shadow[idx] = value;
250 #endif
251 }
252
253 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
254 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
255 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
256 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
257 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
258 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
259 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
260 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
261
262
263 /*
264  * Low level utility functions
265  */
266
267
268 static void _mpic_map_mmio(struct mpic *mpic, unsigned long phys_addr,
269                            struct mpic_reg_bank *rb, unsigned int offset,
270                            unsigned int size)
271 {
272         rb->base = ioremap(phys_addr + offset, size);
273         BUG_ON(rb->base == NULL);
274 }
275
276 #ifdef CONFIG_PPC_DCR
277 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
278                           unsigned int offset, unsigned int size)
279 {
280         const u32 *dbasep;
281
282         dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL);
283
284         rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size);
285         BUG_ON(!DCR_MAP_OK(rb->dhost));
286 }
287
288 static inline void mpic_map(struct mpic *mpic, unsigned long phys_addr,
289                             struct mpic_reg_bank *rb, unsigned int offset,
290                             unsigned int size)
291 {
292         if (mpic->flags & MPIC_USES_DCR)
293                 _mpic_map_dcr(mpic, rb, offset, size);
294         else
295                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
296 }
297 #else /* CONFIG_PPC_DCR */
298 #define mpic_map(m,p,b,o,s)     _mpic_map_mmio(m,p,b,o,s)
299 #endif /* !CONFIG_PPC_DCR */
300
301
302
303 /* Check if we have one of those nice broken MPICs with a flipped endian on
304  * reads from IPI registers
305  */
306 static void __init mpic_test_broken_ipi(struct mpic *mpic)
307 {
308         u32 r;
309
310         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
311         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
312
313         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
314                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
315                 mpic->flags |= MPIC_BROKEN_IPI;
316         }
317 }
318
319 #ifdef CONFIG_MPIC_U3_HT_IRQS
320
321 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
322  * to force the edge setting on the MPIC and do the ack workaround.
323  */
324 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
325 {
326         if (source >= 128 || !mpic->fixups)
327                 return 0;
328         return mpic->fixups[source].base != NULL;
329 }
330
331
332 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
333 {
334         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
335
336         if (fixup->applebase) {
337                 unsigned int soff = (fixup->index >> 3) & ~3;
338                 unsigned int mask = 1U << (fixup->index & 0x1f);
339                 writel(mask, fixup->applebase + soff);
340         } else {
341                 spin_lock(&mpic->fixup_lock);
342                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
343                 writel(fixup->data, fixup->base + 4);
344                 spin_unlock(&mpic->fixup_lock);
345         }
346 }
347
348 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
349                                       unsigned int irqflags)
350 {
351         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
352         unsigned long flags;
353         u32 tmp;
354
355         if (fixup->base == NULL)
356                 return;
357
358         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
359             source, irqflags, fixup->index);
360         spin_lock_irqsave(&mpic->fixup_lock, flags);
361         /* Enable and configure */
362         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
363         tmp = readl(fixup->base + 4);
364         tmp &= ~(0x23U);
365         if (irqflags & IRQ_LEVEL)
366                 tmp |= 0x22;
367         writel(tmp, fixup->base + 4);
368         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
369
370 #ifdef CONFIG_PM
371         /* use the lowest bit inverted to the actual HW,
372          * set if this fixup was enabled, clear otherwise */
373         mpic->save_data[source].fixup_data = tmp | 1;
374 #endif
375 }
376
377 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
378                                        unsigned int irqflags)
379 {
380         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
381         unsigned long flags;
382         u32 tmp;
383
384         if (fixup->base == NULL)
385                 return;
386
387         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
388
389         /* Disable */
390         spin_lock_irqsave(&mpic->fixup_lock, flags);
391         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
392         tmp = readl(fixup->base + 4);
393         tmp |= 1;
394         writel(tmp, fixup->base + 4);
395         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
396
397 #ifdef CONFIG_PM
398         /* use the lowest bit inverted to the actual HW,
399          * set if this fixup was enabled, clear otherwise */
400         mpic->save_data[source].fixup_data = tmp & ~1;
401 #endif
402 }
403
404 #ifdef CONFIG_PCI_MSI
405 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
406                                     unsigned int devfn)
407 {
408         u8 __iomem *base;
409         u8 pos, flags;
410         u64 addr = 0;
411
412         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
413              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
414                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
415                 if (id == PCI_CAP_ID_HT) {
416                         id = readb(devbase + pos + 3);
417                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
418                                 break;
419                 }
420         }
421
422         if (pos == 0)
423                 return;
424
425         base = devbase + pos;
426
427         flags = readb(base + HT_MSI_FLAGS);
428         if (!(flags & HT_MSI_FLAGS_FIXED)) {
429                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
430                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
431         }
432
433         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%lx\n",
434                 PCI_SLOT(devfn), PCI_FUNC(devfn),
435                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
436
437         if (!(flags & HT_MSI_FLAGS_ENABLE))
438                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
439 }
440 #else
441 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
442                                     unsigned int devfn)
443 {
444         return;
445 }
446 #endif
447
448 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
449                                     unsigned int devfn, u32 vdid)
450 {
451         int i, irq, n;
452         u8 __iomem *base;
453         u32 tmp;
454         u8 pos;
455
456         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
457              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
458                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
459                 if (id == PCI_CAP_ID_HT) {
460                         id = readb(devbase + pos + 3);
461                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
462                                 break;
463                 }
464         }
465         if (pos == 0)
466                 return;
467
468         base = devbase + pos;
469         writeb(0x01, base + 2);
470         n = (readl(base + 4) >> 16) & 0xff;
471
472         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
473                " has %d irqs\n",
474                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
475
476         for (i = 0; i <= n; i++) {
477                 writeb(0x10 + 2 * i, base + 2);
478                 tmp = readl(base + 4);
479                 irq = (tmp >> 16) & 0xff;
480                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
481                 /* mask it , will be unmasked later */
482                 tmp |= 0x1;
483                 writel(tmp, base + 4);
484                 mpic->fixups[irq].index = i;
485                 mpic->fixups[irq].base = base;
486                 /* Apple HT PIC has a non-standard way of doing EOIs */
487                 if ((vdid & 0xffff) == 0x106b)
488                         mpic->fixups[irq].applebase = devbase + 0x60;
489                 else
490                         mpic->fixups[irq].applebase = NULL;
491                 writeb(0x11 + 2 * i, base + 2);
492                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
493         }
494 }
495  
496
497 static void __init mpic_scan_ht_pics(struct mpic *mpic)
498 {
499         unsigned int devfn;
500         u8 __iomem *cfgspace;
501
502         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
503
504         /* Allocate fixups array */
505         mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
506         BUG_ON(mpic->fixups == NULL);
507         memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
508
509         /* Init spinlock */
510         spin_lock_init(&mpic->fixup_lock);
511
512         /* Map U3 config space. We assume all IO-APICs are on the primary bus
513          * so we only need to map 64kB.
514          */
515         cfgspace = ioremap(0xf2000000, 0x10000);
516         BUG_ON(cfgspace == NULL);
517
518         /* Now we scan all slots. We do a very quick scan, we read the header
519          * type, vendor ID and device ID only, that's plenty enough
520          */
521         for (devfn = 0; devfn < 0x100; devfn++) {
522                 u8 __iomem *devbase = cfgspace + (devfn << 8);
523                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
524                 u32 l = readl(devbase + PCI_VENDOR_ID);
525                 u16 s;
526
527                 DBG("devfn %x, l: %x\n", devfn, l);
528
529                 /* If no device, skip */
530                 if (l == 0xffffffff || l == 0x00000000 ||
531                     l == 0x0000ffff || l == 0xffff0000)
532                         goto next;
533                 /* Check if is supports capability lists */
534                 s = readw(devbase + PCI_STATUS);
535                 if (!(s & PCI_STATUS_CAP_LIST))
536                         goto next;
537
538                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
539                 mpic_scan_ht_msi(mpic, devbase, devfn);
540
541         next:
542                 /* next device, if function 0 */
543                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
544                         devfn += 7;
545         }
546 }
547
548 #else /* CONFIG_MPIC_U3_HT_IRQS */
549
550 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
551 {
552         return 0;
553 }
554
555 static void __init mpic_scan_ht_pics(struct mpic *mpic)
556 {
557 }
558
559 #endif /* CONFIG_MPIC_U3_HT_IRQS */
560
561
562 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
563
564 /* Find an mpic associated with a given linux interrupt */
565 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
566 {
567         unsigned int src = mpic_irq_to_hw(irq);
568         struct mpic *mpic;
569
570         if (irq < NUM_ISA_INTERRUPTS)
571                 return NULL;
572
573         mpic = irq_desc[irq].chip_data;
574
575         if (is_ipi)
576                 *is_ipi = (src >= mpic->ipi_vecs[0] &&
577                            src <= mpic->ipi_vecs[3]);
578
579         return mpic;
580 }
581
582 /* Convert a cpu mask from logical to physical cpu numbers. */
583 static inline u32 mpic_physmask(u32 cpumask)
584 {
585         int i;
586         u32 mask = 0;
587
588         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
589                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
590         return mask;
591 }
592
593 #ifdef CONFIG_SMP
594 /* Get the mpic structure from the IPI number */
595 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
596 {
597         return irq_desc[ipi].chip_data;
598 }
599 #endif
600
601 /* Get the mpic structure from the irq number */
602 static inline struct mpic * mpic_from_irq(unsigned int irq)
603 {
604         return irq_desc[irq].chip_data;
605 }
606
607 /* Send an EOI */
608 static inline void mpic_eoi(struct mpic *mpic)
609 {
610         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
611         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
612 }
613
614 #ifdef CONFIG_SMP
615 static irqreturn_t mpic_ipi_action(int irq, void *data)
616 {
617         long ipi = (long)data;
618
619         smp_message_recv(ipi);
620
621         return IRQ_HANDLED;
622 }
623 #endif /* CONFIG_SMP */
624
625 /*
626  * Linux descriptor level callbacks
627  */
628
629
630 void mpic_unmask_irq(unsigned int irq)
631 {
632         unsigned int loops = 100000;
633         struct mpic *mpic = mpic_from_irq(irq);
634         unsigned int src = mpic_irq_to_hw(irq);
635
636         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
637
638         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
639                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
640                        ~MPIC_VECPRI_MASK);
641         /* make sure mask gets to controller before we return to user */
642         do {
643                 if (!loops--) {
644                         printk(KERN_ERR "mpic_enable_irq timeout\n");
645                         break;
646                 }
647         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
648 }
649
650 void mpic_mask_irq(unsigned int irq)
651 {
652         unsigned int loops = 100000;
653         struct mpic *mpic = mpic_from_irq(irq);
654         unsigned int src = mpic_irq_to_hw(irq);
655
656         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
657
658         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
659                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
660                        MPIC_VECPRI_MASK);
661
662         /* make sure mask gets to controller before we return to user */
663         do {
664                 if (!loops--) {
665                         printk(KERN_ERR "mpic_enable_irq timeout\n");
666                         break;
667                 }
668         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
669 }
670
671 void mpic_end_irq(unsigned int irq)
672 {
673         struct mpic *mpic = mpic_from_irq(irq);
674
675 #ifdef DEBUG_IRQ
676         DBG("%s: end_irq: %d\n", mpic->name, irq);
677 #endif
678         /* We always EOI on end_irq() even for edge interrupts since that
679          * should only lower the priority, the MPIC should have properly
680          * latched another edge interrupt coming in anyway
681          */
682
683         mpic_eoi(mpic);
684 }
685
686 #ifdef CONFIG_MPIC_U3_HT_IRQS
687
688 static void mpic_unmask_ht_irq(unsigned int irq)
689 {
690         struct mpic *mpic = mpic_from_irq(irq);
691         unsigned int src = mpic_irq_to_hw(irq);
692
693         mpic_unmask_irq(irq);
694
695         if (irq_desc[irq].status & IRQ_LEVEL)
696                 mpic_ht_end_irq(mpic, src);
697 }
698
699 static unsigned int mpic_startup_ht_irq(unsigned int irq)
700 {
701         struct mpic *mpic = mpic_from_irq(irq);
702         unsigned int src = mpic_irq_to_hw(irq);
703
704         mpic_unmask_irq(irq);
705         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
706
707         return 0;
708 }
709
710 static void mpic_shutdown_ht_irq(unsigned int irq)
711 {
712         struct mpic *mpic = mpic_from_irq(irq);
713         unsigned int src = mpic_irq_to_hw(irq);
714
715         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
716         mpic_mask_irq(irq);
717 }
718
719 static void mpic_end_ht_irq(unsigned int irq)
720 {
721         struct mpic *mpic = mpic_from_irq(irq);
722         unsigned int src = mpic_irq_to_hw(irq);
723
724 #ifdef DEBUG_IRQ
725         DBG("%s: end_irq: %d\n", mpic->name, irq);
726 #endif
727         /* We always EOI on end_irq() even for edge interrupts since that
728          * should only lower the priority, the MPIC should have properly
729          * latched another edge interrupt coming in anyway
730          */
731
732         if (irq_desc[irq].status & IRQ_LEVEL)
733                 mpic_ht_end_irq(mpic, src);
734         mpic_eoi(mpic);
735 }
736 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
737
738 #ifdef CONFIG_SMP
739
740 static void mpic_unmask_ipi(unsigned int irq)
741 {
742         struct mpic *mpic = mpic_from_ipi(irq);
743         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
744
745         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
746         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
747 }
748
749 static void mpic_mask_ipi(unsigned int irq)
750 {
751         /* NEVER disable an IPI... that's just plain wrong! */
752 }
753
754 static void mpic_end_ipi(unsigned int irq)
755 {
756         struct mpic *mpic = mpic_from_ipi(irq);
757
758         /*
759          * IPIs are marked IRQ_PER_CPU. This has the side effect of
760          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
761          * applying to them. We EOI them late to avoid re-entering.
762          * We mark IPI's with IRQF_DISABLED as they must run with
763          * irqs disabled.
764          */
765         mpic_eoi(mpic);
766 }
767
768 #endif /* CONFIG_SMP */
769
770 void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
771 {
772         struct mpic *mpic = mpic_from_irq(irq);
773         unsigned int src = mpic_irq_to_hw(irq);
774
775         cpumask_t tmp;
776
777         cpus_and(tmp, cpumask, cpu_online_map);
778
779         mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
780                        mpic_physmask(cpus_addr(tmp)[0]));       
781 }
782
783 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
784 {
785         /* Now convert sense value */
786         switch(type & IRQ_TYPE_SENSE_MASK) {
787         case IRQ_TYPE_EDGE_RISING:
788                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
789                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
790         case IRQ_TYPE_EDGE_FALLING:
791         case IRQ_TYPE_EDGE_BOTH:
792                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
793                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
794         case IRQ_TYPE_LEVEL_HIGH:
795                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
796                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
797         case IRQ_TYPE_LEVEL_LOW:
798         default:
799                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
800                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
801         }
802 }
803
804 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
805 {
806         struct mpic *mpic = mpic_from_irq(virq);
807         unsigned int src = mpic_irq_to_hw(virq);
808         struct irq_desc *desc = get_irq_desc(virq);
809         unsigned int vecpri, vold, vnew;
810
811         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
812             mpic, virq, src, flow_type);
813
814         if (src >= mpic->irq_count)
815                 return -EINVAL;
816
817         if (flow_type == IRQ_TYPE_NONE)
818                 if (mpic->senses && src < mpic->senses_count)
819                         flow_type = mpic->senses[src];
820         if (flow_type == IRQ_TYPE_NONE)
821                 flow_type = IRQ_TYPE_LEVEL_LOW;
822
823         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
824         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
825         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
826                 desc->status |= IRQ_LEVEL;
827
828         if (mpic_is_ht_interrupt(mpic, src))
829                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
830                         MPIC_VECPRI_SENSE_EDGE;
831         else
832                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
833
834         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
835         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
836                         MPIC_INFO(VECPRI_SENSE_MASK));
837         vnew |= vecpri;
838         if (vold != vnew)
839                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
840
841         return 0;
842 }
843
844 static struct irq_chip mpic_irq_chip = {
845         .mask           = mpic_mask_irq,
846         .unmask         = mpic_unmask_irq,
847         .eoi            = mpic_end_irq,
848         .set_type       = mpic_set_irq_type,
849 };
850
851 #ifdef CONFIG_SMP
852 static struct irq_chip mpic_ipi_chip = {
853         .mask           = mpic_mask_ipi,
854         .unmask         = mpic_unmask_ipi,
855         .eoi            = mpic_end_ipi,
856 };
857 #endif /* CONFIG_SMP */
858
859 #ifdef CONFIG_MPIC_U3_HT_IRQS
860 static struct irq_chip mpic_irq_ht_chip = {
861         .startup        = mpic_startup_ht_irq,
862         .shutdown       = mpic_shutdown_ht_irq,
863         .mask           = mpic_mask_irq,
864         .unmask         = mpic_unmask_ht_irq,
865         .eoi            = mpic_end_ht_irq,
866         .set_type       = mpic_set_irq_type,
867 };
868 #endif /* CONFIG_MPIC_U3_HT_IRQS */
869
870
871 static int mpic_host_match(struct irq_host *h, struct device_node *node)
872 {
873         /* Exact match, unless mpic node is NULL */
874         return h->of_node == NULL || h->of_node == node;
875 }
876
877 static int mpic_host_map(struct irq_host *h, unsigned int virq,
878                          irq_hw_number_t hw)
879 {
880         struct mpic *mpic = h->host_data;
881         struct irq_chip *chip;
882
883         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
884
885         if (hw == mpic->spurious_vec)
886                 return -EINVAL;
887         if (mpic->protected && test_bit(hw, mpic->protected))
888                 return -EINVAL;
889
890 #ifdef CONFIG_SMP
891         else if (hw >= mpic->ipi_vecs[0]) {
892                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
893
894                 DBG("mpic: mapping as IPI\n");
895                 set_irq_chip_data(virq, mpic);
896                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
897                                          handle_percpu_irq);
898                 return 0;
899         }
900 #endif /* CONFIG_SMP */
901
902         if (hw >= mpic->irq_count)
903                 return -EINVAL;
904
905         mpic_msi_reserve_hwirq(mpic, hw);
906
907         /* Default chip */
908         chip = &mpic->hc_irq;
909
910 #ifdef CONFIG_MPIC_U3_HT_IRQS
911         /* Check for HT interrupts, override vecpri */
912         if (mpic_is_ht_interrupt(mpic, hw))
913                 chip = &mpic->hc_ht_irq;
914 #endif /* CONFIG_MPIC_U3_HT_IRQS */
915
916         DBG("mpic: mapping to irq chip @%p\n", chip);
917
918         set_irq_chip_data(virq, mpic);
919         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
920
921         /* Set default irq type */
922         set_irq_type(virq, IRQ_TYPE_NONE);
923
924         return 0;
925 }
926
927 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
928                            u32 *intspec, unsigned int intsize,
929                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
930
931 {
932         static unsigned char map_mpic_senses[4] = {
933                 IRQ_TYPE_EDGE_RISING,
934                 IRQ_TYPE_LEVEL_LOW,
935                 IRQ_TYPE_LEVEL_HIGH,
936                 IRQ_TYPE_EDGE_FALLING,
937         };
938
939         *out_hwirq = intspec[0];
940         if (intsize > 1) {
941                 u32 mask = 0x3;
942
943                 /* Apple invented a new race of encoding on machines with
944                  * an HT APIC. They encode, among others, the index within
945                  * the HT APIC. We don't care about it here since thankfully,
946                  * it appears that they have the APIC already properly
947                  * configured, and thus our current fixup code that reads the
948                  * APIC config works fine. However, we still need to mask out
949                  * bits in the specifier to make sure we only get bit 0 which
950                  * is the level/edge bit (the only sense bit exposed by Apple),
951                  * as their bit 1 means something else.
952                  */
953                 if (machine_is(powermac))
954                         mask = 0x1;
955                 *out_flags = map_mpic_senses[intspec[1] & mask];
956         } else
957                 *out_flags = IRQ_TYPE_NONE;
958
959         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
960             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
961
962         return 0;
963 }
964
965 static struct irq_host_ops mpic_host_ops = {
966         .match = mpic_host_match,
967         .map = mpic_host_map,
968         .xlate = mpic_host_xlate,
969 };
970
971 /*
972  * Exported functions
973  */
974
975 struct mpic * __init mpic_alloc(struct device_node *node,
976                                 phys_addr_t phys_addr,
977                                 unsigned int flags,
978                                 unsigned int isu_size,
979                                 unsigned int irq_count,
980                                 const char *name)
981 {
982         struct mpic     *mpic;
983         u32             reg;
984         const char      *vers;
985         int             i;
986         int             intvec_top;
987         u64             paddr = phys_addr;
988
989         mpic = alloc_bootmem(sizeof(struct mpic));
990         if (mpic == NULL)
991                 return NULL;
992         
993         memset(mpic, 0, sizeof(struct mpic));
994         mpic->name = name;
995
996         mpic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
997                                        isu_size, &mpic_host_ops,
998                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
999         if (mpic->irqhost == NULL) {
1000                 of_node_put(node);
1001                 return NULL;
1002         }
1003
1004         mpic->irqhost->host_data = mpic;
1005         mpic->hc_irq = mpic_irq_chip;
1006         mpic->hc_irq.typename = name;
1007         if (flags & MPIC_PRIMARY)
1008                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1009 #ifdef CONFIG_MPIC_U3_HT_IRQS
1010         mpic->hc_ht_irq = mpic_irq_ht_chip;
1011         mpic->hc_ht_irq.typename = name;
1012         if (flags & MPIC_PRIMARY)
1013                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1014 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1015
1016 #ifdef CONFIG_SMP
1017         mpic->hc_ipi = mpic_ipi_chip;
1018         mpic->hc_ipi.typename = name;
1019 #endif /* CONFIG_SMP */
1020
1021         mpic->flags = flags;
1022         mpic->isu_size = isu_size;
1023         mpic->irq_count = irq_count;
1024         mpic->num_sources = 0; /* so far */
1025
1026         if (flags & MPIC_LARGE_VECTORS)
1027                 intvec_top = 2047;
1028         else
1029                 intvec_top = 255;
1030
1031         mpic->timer_vecs[0] = intvec_top - 8;
1032         mpic->timer_vecs[1] = intvec_top - 7;
1033         mpic->timer_vecs[2] = intvec_top - 6;
1034         mpic->timer_vecs[3] = intvec_top - 5;
1035         mpic->ipi_vecs[0]   = intvec_top - 4;
1036         mpic->ipi_vecs[1]   = intvec_top - 3;
1037         mpic->ipi_vecs[2]   = intvec_top - 2;
1038         mpic->ipi_vecs[3]   = intvec_top - 1;
1039         mpic->spurious_vec  = intvec_top;
1040
1041         /* Check for "big-endian" in device-tree */
1042         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1043                 mpic->flags |= MPIC_BIG_ENDIAN;
1044
1045         /* Look for protected sources */
1046         if (node) {
1047                 unsigned int psize, bits, mapsize;
1048                 const u32 *psrc =
1049                         of_get_property(node, "protected-sources", &psize);
1050                 if (psrc) {
1051                         psize /= 4;
1052                         bits = intvec_top + 1;
1053                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1054                         mpic->protected = alloc_bootmem(mapsize);
1055                         BUG_ON(mpic->protected == NULL);
1056                         memset(mpic->protected, 0, mapsize);
1057                         for (i = 0; i < psize; i++) {
1058                                 if (psrc[i] > intvec_top)
1059                                         continue;
1060                                 __set_bit(psrc[i], mpic->protected);
1061                         }
1062                 }
1063         }
1064
1065 #ifdef CONFIG_MPIC_WEIRD
1066         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1067 #endif
1068
1069         /* default register type */
1070         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1071                 mpic_access_mmio_be : mpic_access_mmio_le;
1072
1073         /* If no physical address is passed in, a device-node is mandatory */
1074         BUG_ON(paddr == 0 && node == NULL);
1075
1076         /* If no physical address passed in, check if it's dcr based */
1077         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1078 #ifdef CONFIG_PPC_DCR
1079                 mpic->flags |= MPIC_USES_DCR;
1080                 mpic->reg_type = mpic_access_dcr;
1081 #else
1082                 BUG();
1083 #endif /* CONFIG_PPC_DCR */
1084         }
1085
1086         /* If the MPIC is not DCR based, and no physical address was passed
1087          * in, try to obtain one
1088          */
1089         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1090                 const u32 *reg;
1091                 reg = of_get_property(node, "reg", NULL);
1092                 BUG_ON(reg == NULL);
1093                 paddr = of_translate_address(node, reg);
1094                 BUG_ON(paddr == OF_BAD_ADDR);
1095         }
1096
1097         /* Map the global registers */
1098         mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1099         mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1100
1101         /* Reset */
1102         if (flags & MPIC_WANTS_RESET) {
1103                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1104                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1105                            | MPIC_GREG_GCONF_RESET);
1106                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1107                        & MPIC_GREG_GCONF_RESET)
1108                         mb();
1109         }
1110
1111         /* Read feature register, calculate num CPUs and, for non-ISU
1112          * MPICs, num sources as well. On ISU MPICs, sources are counted
1113          * as ISUs are added
1114          */
1115         reg = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1116         mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1117                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1118         if (isu_size == 0)
1119                 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1120                                      >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1121
1122         /* Map the per-CPU registers */
1123         for (i = 0; i < mpic->num_cpus; i++) {
1124                 mpic_map(mpic, paddr, &mpic->cpuregs[i],
1125                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1126                          0x1000);
1127         }
1128
1129         /* Initialize main ISU if none provided */
1130         if (mpic->isu_size == 0) {
1131                 mpic->isu_size = mpic->num_sources;
1132                 mpic_map(mpic, paddr, &mpic->isus[0],
1133                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1134         }
1135         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1136         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1137
1138         /* Display version */
1139         switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
1140         case 1:
1141                 vers = "1.0";
1142                 break;
1143         case 2:
1144                 vers = "1.2";
1145                 break;
1146         case 3:
1147                 vers = "1.3";
1148                 break;
1149         default:
1150                 vers = "<unknown>";
1151                 break;
1152         }
1153         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1154                " max %d CPUs\n",
1155                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1156         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1157                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1158
1159         mpic->next = mpics;
1160         mpics = mpic;
1161
1162         if (flags & MPIC_PRIMARY) {
1163                 mpic_primary = mpic;
1164                 irq_set_default_host(mpic->irqhost);
1165         }
1166
1167         return mpic;
1168 }
1169
1170 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1171                             phys_addr_t paddr)
1172 {
1173         unsigned int isu_first = isu_num * mpic->isu_size;
1174
1175         BUG_ON(isu_num >= MPIC_MAX_ISU);
1176
1177         mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
1178                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1179         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1180                 mpic->num_sources = isu_first + mpic->isu_size;
1181 }
1182
1183 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1184 {
1185         mpic->senses = senses;
1186         mpic->senses_count = count;
1187 }
1188
1189 void __init mpic_init(struct mpic *mpic)
1190 {
1191         int i;
1192
1193         BUG_ON(mpic->num_sources == 0);
1194
1195         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1196
1197         /* Set current processor priority to max */
1198         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1199
1200         /* Initialize timers: just disable them all */
1201         for (i = 0; i < 4; i++) {
1202                 mpic_write(mpic->tmregs,
1203                            i * MPIC_INFO(TIMER_STRIDE) +
1204                            MPIC_INFO(TIMER_DESTINATION), 0);
1205                 mpic_write(mpic->tmregs,
1206                            i * MPIC_INFO(TIMER_STRIDE) +
1207                            MPIC_INFO(TIMER_VECTOR_PRI),
1208                            MPIC_VECPRI_MASK |
1209                            (mpic->timer_vecs[0] + i));
1210         }
1211
1212         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1213         mpic_test_broken_ipi(mpic);
1214         for (i = 0; i < 4; i++) {
1215                 mpic_ipi_write(i,
1216                                MPIC_VECPRI_MASK |
1217                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1218                                (mpic->ipi_vecs[0] + i));
1219         }
1220
1221         /* Initialize interrupt sources */
1222         if (mpic->irq_count == 0)
1223                 mpic->irq_count = mpic->num_sources;
1224
1225         /* Do the HT PIC fixups on U3 broken mpic */
1226         DBG("MPIC flags: %x\n", mpic->flags);
1227         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1228                 mpic_scan_ht_pics(mpic);
1229                 mpic_u3msi_init(mpic);
1230         }
1231
1232         for (i = 0; i < mpic->num_sources; i++) {
1233                 /* start with vector = source number, and masked */
1234                 u32 vecpri = MPIC_VECPRI_MASK | i |
1235                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1236                 
1237                 /* check if protected */
1238                 if (mpic->protected && test_bit(i, mpic->protected))
1239                         continue;
1240                 /* init hw */
1241                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1242                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1243                                1 << hard_smp_processor_id());
1244         }
1245         
1246         /* Init spurious vector */
1247         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1248
1249         /* Disable 8259 passthrough, if supported */
1250         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1251                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1252                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1253                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1254
1255         /* Set current processor priority to 0 */
1256         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1257
1258 #ifdef CONFIG_PM
1259         /* allocate memory to save mpic state */
1260         mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save));
1261         BUG_ON(mpic->save_data == NULL);
1262 #endif
1263 }
1264
1265 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1266 {
1267         u32 v;
1268
1269         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1270         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1271         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1272         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1273 }
1274
1275 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1276 {
1277         unsigned long flags;
1278         u32 v;
1279
1280         spin_lock_irqsave(&mpic_lock, flags);
1281         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1282         if (enable)
1283                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1284         else
1285                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1286         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1287         spin_unlock_irqrestore(&mpic_lock, flags);
1288 }
1289
1290 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1291 {
1292         int is_ipi;
1293         struct mpic *mpic = mpic_find(irq, &is_ipi);
1294         unsigned int src = mpic_irq_to_hw(irq);
1295         unsigned long flags;
1296         u32 reg;
1297
1298         spin_lock_irqsave(&mpic_lock, flags);
1299         if (is_ipi) {
1300                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1301                         ~MPIC_VECPRI_PRIORITY_MASK;
1302                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1303                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1304         } else {
1305                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1306                         & ~MPIC_VECPRI_PRIORITY_MASK;
1307                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1308                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1309         }
1310         spin_unlock_irqrestore(&mpic_lock, flags);
1311 }
1312
1313 unsigned int mpic_irq_get_priority(unsigned int irq)
1314 {
1315         int is_ipi;
1316         struct mpic *mpic = mpic_find(irq, &is_ipi);
1317         unsigned int src = mpic_irq_to_hw(irq);
1318         unsigned long flags;
1319         u32 reg;
1320
1321         spin_lock_irqsave(&mpic_lock, flags);
1322         if (is_ipi)
1323                 reg = mpic_ipi_read(src = mpic->ipi_vecs[0]);
1324         else
1325                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
1326         spin_unlock_irqrestore(&mpic_lock, flags);
1327         return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
1328 }
1329
1330 void mpic_setup_this_cpu(void)
1331 {
1332 #ifdef CONFIG_SMP
1333         struct mpic *mpic = mpic_primary;
1334         unsigned long flags;
1335         u32 msk = 1 << hard_smp_processor_id();
1336         unsigned int i;
1337
1338         BUG_ON(mpic == NULL);
1339
1340         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1341
1342         spin_lock_irqsave(&mpic_lock, flags);
1343
1344         /* let the mpic know we want intrs. default affinity is 0xffffffff
1345          * until changed via /proc. That's how it's done on x86. If we want
1346          * it differently, then we should make sure we also change the default
1347          * values of irq_desc[].affinity in irq.c.
1348          */
1349         if (distribute_irqs) {
1350                 for (i = 0; i < mpic->num_sources ; i++)
1351                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1352                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1353         }
1354
1355         /* Set current processor priority to 0 */
1356         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1357
1358         spin_unlock_irqrestore(&mpic_lock, flags);
1359 #endif /* CONFIG_SMP */
1360 }
1361
1362 int mpic_cpu_get_priority(void)
1363 {
1364         struct mpic *mpic = mpic_primary;
1365
1366         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1367 }
1368
1369 void mpic_cpu_set_priority(int prio)
1370 {
1371         struct mpic *mpic = mpic_primary;
1372
1373         prio &= MPIC_CPU_TASKPRI_MASK;
1374         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1375 }
1376
1377 /*
1378  * XXX: someone who knows mpic should check this.
1379  * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
1380  * or can we reset the mpic in the new kernel?
1381  */
1382 void mpic_teardown_this_cpu(int secondary)
1383 {
1384         struct mpic *mpic = mpic_primary;
1385         unsigned long flags;
1386         u32 msk = 1 << hard_smp_processor_id();
1387         unsigned int i;
1388
1389         BUG_ON(mpic == NULL);
1390
1391         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1392         spin_lock_irqsave(&mpic_lock, flags);
1393
1394         /* let the mpic know we don't want intrs.  */
1395         for (i = 0; i < mpic->num_sources ; i++)
1396                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1397                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1398
1399         /* Set current processor priority to max */
1400         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1401
1402         spin_unlock_irqrestore(&mpic_lock, flags);
1403 }
1404
1405
1406 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1407 {
1408         struct mpic *mpic = mpic_primary;
1409
1410         BUG_ON(mpic == NULL);
1411
1412 #ifdef DEBUG_IPI
1413         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1414 #endif
1415
1416         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1417                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1418                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1419 }
1420
1421 unsigned int mpic_get_one_irq(struct mpic *mpic)
1422 {
1423         u32 src;
1424
1425         src = mpic_cpu_read(MPIC_INFO(CPU_INTACK)) & MPIC_INFO(VECPRI_VECTOR_MASK);
1426 #ifdef DEBUG_LOW
1427         DBG("%s: get_one_irq(): %d\n", mpic->name, src);
1428 #endif
1429         if (unlikely(src == mpic->spurious_vec)) {
1430                 if (mpic->flags & MPIC_SPV_EOI)
1431                         mpic_eoi(mpic);
1432                 return NO_IRQ;
1433         }
1434         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1435                 if (printk_ratelimit())
1436                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1437                                mpic->name, (int)src);
1438                 mpic_eoi(mpic);
1439                 return NO_IRQ;
1440         }
1441
1442         return irq_linear_revmap(mpic->irqhost, src);
1443 }
1444
1445 unsigned int mpic_get_irq(void)
1446 {
1447         struct mpic *mpic = mpic_primary;
1448
1449         BUG_ON(mpic == NULL);
1450
1451         return mpic_get_one_irq(mpic);
1452 }
1453
1454
1455 #ifdef CONFIG_SMP
1456 void mpic_request_ipis(void)
1457 {
1458         struct mpic *mpic = mpic_primary;
1459         long i, err;
1460         static char *ipi_names[] = {
1461                 "IPI0 (call function)",
1462                 "IPI1 (reschedule)",
1463                 "IPI2 (unused)",
1464                 "IPI3 (debugger break)",
1465         };
1466         BUG_ON(mpic == NULL);
1467
1468         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1469
1470         for (i = 0; i < 4; i++) {
1471                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1472                                                        mpic->ipi_vecs[0] + i);
1473                 if (vipi == NO_IRQ) {
1474                         printk(KERN_ERR "Failed to map IPI %ld\n", i);
1475                         break;
1476                 }
1477                 err = request_irq(vipi, mpic_ipi_action,
1478                                   IRQF_DISABLED|IRQF_PERCPU,
1479                                   ipi_names[i], (void *)i);
1480                 if (err) {
1481                         printk(KERN_ERR "Request of irq %d for IPI %ld failed\n",
1482                                vipi, i);
1483                         break;
1484                 }
1485         }
1486 }
1487
1488 void smp_mpic_message_pass(int target, int msg)
1489 {
1490         /* make sure we're sending something that translates to an IPI */
1491         if ((unsigned int)msg > 3) {
1492                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1493                        smp_processor_id(), msg);
1494                 return;
1495         }
1496         switch (target) {
1497         case MSG_ALL:
1498                 mpic_send_ipi(msg, 0xffffffff);
1499                 break;
1500         case MSG_ALL_BUT_SELF:
1501                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1502                 break;
1503         default:
1504                 mpic_send_ipi(msg, 1 << target);
1505                 break;
1506         }
1507 }
1508
1509 int __init smp_mpic_probe(void)
1510 {
1511         int nr_cpus;
1512
1513         DBG("smp_mpic_probe()...\n");
1514
1515         nr_cpus = cpus_weight(cpu_possible_map);
1516
1517         DBG("nr_cpus: %d\n", nr_cpus);
1518
1519         if (nr_cpus > 1)
1520                 mpic_request_ipis();
1521
1522         return nr_cpus;
1523 }
1524
1525 void __devinit smp_mpic_setup_cpu(int cpu)
1526 {
1527         mpic_setup_this_cpu();
1528 }
1529 #endif /* CONFIG_SMP */
1530
1531 #ifdef CONFIG_PM
1532 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1533 {
1534         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1535         int i;
1536
1537         for (i = 0; i < mpic->num_sources; i++) {
1538                 mpic->save_data[i].vecprio =
1539                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1540                 mpic->save_data[i].dest =
1541                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1542         }
1543
1544         return 0;
1545 }
1546
1547 static int mpic_resume(struct sys_device *dev)
1548 {
1549         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1550         int i;
1551
1552         for (i = 0; i < mpic->num_sources; i++) {
1553                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1554                                mpic->save_data[i].vecprio);
1555                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1556                                mpic->save_data[i].dest);
1557
1558 #ifdef CONFIG_MPIC_U3_HT_IRQS
1559         {
1560                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1561
1562                 if (fixup->base) {
1563                         /* we use the lowest bit in an inverted meaning */
1564                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1565                                 continue;
1566
1567                         /* Enable and configure */
1568                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1569
1570                         writel(mpic->save_data[i].fixup_data & ~1,
1571                                fixup->base + 4);
1572                 }
1573         }
1574 #endif
1575         } /* end for loop */
1576
1577         return 0;
1578 }
1579 #endif
1580
1581 static struct sysdev_class mpic_sysclass = {
1582 #ifdef CONFIG_PM
1583         .resume = mpic_resume,
1584         .suspend = mpic_suspend,
1585 #endif
1586         set_kset_name("mpic"),
1587 };
1588
1589 static int mpic_init_sys(void)
1590 {
1591         struct mpic *mpic = mpics;
1592         int error, id = 0;
1593
1594         error = sysdev_class_register(&mpic_sysclass);
1595
1596         while (mpic && !error) {
1597                 mpic->sysdev.cls = &mpic_sysclass;
1598                 mpic->sysdev.id = id++;
1599                 error = sysdev_register(&mpic->sysdev);
1600                 mpic = mpic->next;
1601         }
1602         return error;
1603 }
1604
1605 device_initcall(mpic_init_sys);