1 /*
2 * arch/powerpc/kernel/mpic.c
3 *
4 * Driver for interrupt controllers following the OpenPIC standard, the
5 * common implementation being 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 * Copyright 2010-2012 Freescale Semiconductor, Inc.
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file COPYING in the main directory of this archive
13 * for more details.
14 */
15
16 #undef DEBUG
17 #undef DEBUG_IPI
18 #undef DEBUG_IRQ
19 #undef DEBUG_LOW
20
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/irq.h>
25 #include <linux/smp.h>
26 #include <linux/interrupt.h>
27 #include <linux/spinlock.h>
28 #include <linux/pci.h>
29 #include <linux/slab.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/ratelimit.h>
32 #include <linux/pgtable.h>
33 #include <linux/of_address.h>
34 #include <linux/of_irq.h>
35
36 #include <asm/ptrace.h>
37 #include <asm/signal.h>
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/machdep.h>
41 #include <asm/mpic.h>
42 #include <asm/smp.h>
43
44 #include "mpic.h"
45
46 #ifdef DEBUG
47 #define DBG(fmt...) printk(fmt)
48 #else
49 #define DBG(fmt...)
50 #endif
51
52 const struct bus_type mpic_subsys = {
53 .name = "mpic",
54 .dev_name = "mpic",
55 };
56 EXPORT_SYMBOL_GPL(mpic_subsys);
57
58 static struct mpic *mpics;
59 static struct mpic *mpic_primary;
60 static DEFINE_RAW_SPINLOCK(mpic_lock);
61
62 #ifdef CONFIG_PPC32 /* XXX for now */
63 #ifdef CONFIG_IRQ_ALL_CPUS
64 #define distribute_irqs (1)
65 #else
66 #define distribute_irqs (0)
67 #endif
68 #endif
69
70 #ifdef CONFIG_MPIC_WEIRD
71 static u32 mpic_infos[][MPIC_IDX_END] = {
72 [0] = { /* Original OpenPIC compatible MPIC */
73 MPIC_GREG_BASE,
74 MPIC_GREG_FEATURE_0,
75 MPIC_GREG_GLOBAL_CONF_0,
76 MPIC_GREG_VENDOR_ID,
77 MPIC_GREG_IPI_VECTOR_PRI_0,
78 MPIC_GREG_IPI_STRIDE,
79 MPIC_GREG_SPURIOUS,
80 MPIC_GREG_TIMER_FREQ,
81
82 MPIC_TIMER_BASE,
83 MPIC_TIMER_STRIDE,
84 MPIC_TIMER_CURRENT_CNT,
85 MPIC_TIMER_BASE_CNT,
86 MPIC_TIMER_VECTOR_PRI,
87 MPIC_TIMER_DESTINATION,
88
89 MPIC_CPU_BASE,
90 MPIC_CPU_STRIDE,
91 MPIC_CPU_IPI_DISPATCH_0,
92 MPIC_CPU_IPI_DISPATCH_STRIDE,
93 MPIC_CPU_CURRENT_TASK_PRI,
94 MPIC_CPU_WHOAMI,
95 MPIC_CPU_INTACK,
96 MPIC_CPU_EOI,
97 MPIC_CPU_MCACK,
98
99 MPIC_IRQ_BASE,
100 MPIC_IRQ_STRIDE,
101 MPIC_IRQ_VECTOR_PRI,
102 MPIC_VECPRI_VECTOR_MASK,
103 MPIC_VECPRI_POLARITY_POSITIVE,
104 MPIC_VECPRI_POLARITY_NEGATIVE,
105 MPIC_VECPRI_SENSE_LEVEL,
106 MPIC_VECPRI_SENSE_EDGE,
107 MPIC_VECPRI_POLARITY_MASK,
108 MPIC_VECPRI_SENSE_MASK,
109 MPIC_IRQ_DESTINATION
110 },
111 [1] = { /* Tsi108/109 PIC */
112 TSI108_GREG_BASE,
113 TSI108_GREG_FEATURE_0,
114 TSI108_GREG_GLOBAL_CONF_0,
115 TSI108_GREG_VENDOR_ID,
116 TSI108_GREG_IPI_VECTOR_PRI_0,
117 TSI108_GREG_IPI_STRIDE,
118 TSI108_GREG_SPURIOUS,
119 TSI108_GREG_TIMER_FREQ,
120
121 TSI108_TIMER_BASE,
122 TSI108_TIMER_STRIDE,
123 TSI108_TIMER_CURRENT_CNT,
124 TSI108_TIMER_BASE_CNT,
125 TSI108_TIMER_VECTOR_PRI,
126 TSI108_TIMER_DESTINATION,
127
128 TSI108_CPU_BASE,
129 TSI108_CPU_STRIDE,
130 TSI108_CPU_IPI_DISPATCH_0,
131 TSI108_CPU_IPI_DISPATCH_STRIDE,
132 TSI108_CPU_CURRENT_TASK_PRI,
133 TSI108_CPU_WHOAMI,
134 TSI108_CPU_INTACK,
135 TSI108_CPU_EOI,
136 TSI108_CPU_MCACK,
137
138 TSI108_IRQ_BASE,
139 TSI108_IRQ_STRIDE,
140 TSI108_IRQ_VECTOR_PRI,
141 TSI108_VECPRI_VECTOR_MASK,
142 TSI108_VECPRI_POLARITY_POSITIVE,
143 TSI108_VECPRI_POLARITY_NEGATIVE,
144 TSI108_VECPRI_SENSE_LEVEL,
145 TSI108_VECPRI_SENSE_EDGE,
146 TSI108_VECPRI_POLARITY_MASK,
147 TSI108_VECPRI_SENSE_MASK,
148 TSI108_IRQ_DESTINATION
149 },
150 };
151
152 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
153
154 #else /* CONFIG_MPIC_WEIRD */
155
156 #define MPIC_INFO(name) MPIC_##name
157
158 #endif /* CONFIG_MPIC_WEIRD */
159
160 static inline unsigned int mpic_processor_id(struct mpic *mpic)
161 {
162 unsigned int cpu = 0;
163
164 if (!(mpic->flags & MPIC_SECONDARY))
165 cpu = hard_smp_processor_id();
166
167 return cpu;
168 }
169
170 /*
171 * Register accessor functions
172 */
173
174
175 static inline u32 _mpic_read(enum mpic_reg_type type,
176 struct mpic_reg_bank *rb,
177 unsigned int reg)
178 {
179 switch(type) {
180 #ifdef CONFIG_PPC_DCR
181 case mpic_access_dcr:
182 return dcr_read(rb->dhost, reg);
183 #endif
184 case mpic_access_mmio_be:
185 return in_be32(rb->base + (reg >> 2));
186 case mpic_access_mmio_le:
187 default:
188 return in_le32(rb->base + (reg >> 2));
189 }
190 }
191
192 static inline void _mpic_write(enum mpic_reg_type type,
193 struct mpic_reg_bank *rb,
194 unsigned int reg, u32 value)
195 {
196 switch(type) {
197 #ifdef CONFIG_PPC_DCR
198 case mpic_access_dcr:
199 dcr_write(rb->dhost, reg, value);
200 break;
201 #endif
202 case mpic_access_mmio_be:
203 out_be32(rb->base + (reg >> 2), value);
204 break;
205 case mpic_access_mmio_le:
206 default:
207 out_le32(rb->base + (reg >> 2), value);
208 break;
209 }
210 }
211
212 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
213 {
214 enum mpic_reg_type type = mpic->reg_type;
215 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
216 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
217
218 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
219 type = mpic_access_mmio_be;
220 return _mpic_read(type, &mpic->gregs, offset);
221 }
222
223 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
224 {
225 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
226 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
227
228 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
229 }
230
231 static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm)
232 {
233 return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE +
234 (tm & 3) * MPIC_INFO(TIMER_STRIDE);
235 }
236
237 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
238 {
239 unsigned int offset = mpic_tm_offset(mpic, tm) +
240 MPIC_INFO(TIMER_VECTOR_PRI);
241
242 return _mpic_read(mpic->reg_type, &mpic->tmregs, offset);
243 }
244
245 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value)
246 {
247 unsigned int offset = mpic_tm_offset(mpic, tm) +
248 MPIC_INFO(TIMER_VECTOR_PRI);
249
250 _mpic_write(mpic->reg_type, &mpic->tmregs, offset, value);
251 }
252
253 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
254 {
255 unsigned int cpu = mpic_processor_id(mpic);
256
257 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
258 }
259
260 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
261 {
262 unsigned int cpu = mpic_processor_id(mpic);
263
264 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
265 }
266
267 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
268 {
269 unsigned int isu = src_no >> mpic->isu_shift;
270 unsigned int idx = src_no & mpic->isu_mask;
271 unsigned int val;
272
273 val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
274 reg + (idx * MPIC_INFO(IRQ_STRIDE)));
275 #ifdef CONFIG_MPIC_BROKEN_REGREAD
276 if (reg == 0)
277 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
278 mpic->isu_reg0_shadow[src_no];
279 #endif
280 return val;
281 }
282
283 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
284 unsigned int reg, u32 value)
285 {
286 unsigned int isu = src_no >> mpic->isu_shift;
287 unsigned int idx = src_no & mpic->isu_mask;
288
289 _mpic_write(mpic->reg_type, &mpic->isus[isu],
290 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
291
292 #ifdef CONFIG_MPIC_BROKEN_REGREAD
293 if (reg == 0)
294 mpic->isu_reg0_shadow[src_no] =
295 value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
296 #endif
297 }
298
299 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r))
300 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v))
301 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
302 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
303 #define mpic_tm_read(i) _mpic_tm_read(mpic,(i))
304 #define mpic_tm_write(i,v) _mpic_tm_write(mpic,(i),(v))
305 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
306 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
307 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
308 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
309
310
311 /*
312 * Low level utility functions
313 */
314
315
316 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
317 struct mpic_reg_bank *rb, unsigned int offset,
318 unsigned int size)
319 {
320 rb->base = ioremap(phys_addr + offset, size);
321 BUG_ON(rb->base == NULL);
322 }
323
324 #ifdef CONFIG_PPC_DCR
325 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
326 unsigned int offset, unsigned int size)
327 {
328 phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0);
329 rb->dhost = dcr_map(mpic->node, phys_addr + offset, size);
330 BUG_ON(!DCR_MAP_OK(rb->dhost));
331 }
332
333 static inline void mpic_map(struct mpic *mpic,
334 phys_addr_t phys_addr, struct mpic_reg_bank *rb,
335 unsigned int offset, unsigned int size)
336 {
337 if (mpic->flags & MPIC_USES_DCR)
338 _mpic_map_dcr(mpic, rb, offset, size);
339 else
340 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
341 }
342 #else /* CONFIG_PPC_DCR */
343 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
344 #endif /* !CONFIG_PPC_DCR */
345
346
347
348 /* Check if we have one of those nice broken MPICs with a flipped endian on
349 * reads from IPI registers
350 */
351 static void __init mpic_test_broken_ipi(struct mpic *mpic)
352 {
353 u32 r;
354
355 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
356 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
357
358 if (r == swab32(MPIC_VECPRI_MASK)) {
359 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
360 mpic->flags |= MPIC_BROKEN_IPI;
361 }
362 }
363
364 #ifdef CONFIG_MPIC_U3_HT_IRQS
365
366 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
367 * to force the edge setting on the MPIC and do the ack workaround.
368 */
369 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
370 {
371 if (source >= 128 || !mpic->fixups)
372 return 0;
373 return mpic->fixups[source].base != NULL;
374 }
375
376
377 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
378 {
379 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
380
381 if (fixup->applebase) {
382 unsigned int soff = (fixup->index >> 3) & ~3;
383 unsigned int mask = 1U << (fixup->index & 0x1f);
384 writel(mask, fixup->applebase + soff);
385 } else {
386 raw_spin_lock(&mpic->fixup_lock);
387 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
388 writel(fixup->data, fixup->base + 4);
389 raw_spin_unlock(&mpic->fixup_lock);
390 }
391 }
392
393 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
394 bool level)
395 {
396 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
397 unsigned long flags;
398 u32 tmp;
399
400 if (fixup->base == NULL)
401 return;
402
403 DBG("startup_ht_interrupt(0x%x) index: %d\n",
404 source, fixup->index);
405 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
406 /* Enable and configure */
407 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
408 tmp = readl(fixup->base + 4);
409 tmp &= ~(0x23U);
410 if (level)
411 tmp |= 0x22;
412 writel(tmp, fixup->base + 4);
413 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
414
415 #ifdef CONFIG_PM
416 /* use the lowest bit inverted to the actual HW,
417 * set if this fixup was enabled, clear otherwise */
418 mpic->save_data[source].fixup_data = tmp | 1;
419 #endif
420 }
421
422 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
423 {
424 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
425 unsigned long flags;
426 u32 tmp;
427
428 if (fixup->base == NULL)
429 return;
430
431 DBG("shutdown_ht_interrupt(0x%x)\n", source);
432
433 /* Disable */
434 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
435 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
436 tmp = readl(fixup->base + 4);
437 tmp |= 1;
438 writel(tmp, fixup->base + 4);
439 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
440
441 #ifdef CONFIG_PM
442 /* use the lowest bit inverted to the actual HW,
443 * set if this fixup was enabled, clear otherwise */
444 mpic->save_data[source].fixup_data = tmp & ~1;
445 #endif
446 }
447
448 #ifdef CONFIG_PCI_MSI
449 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
450 unsigned int devfn)
451 {
452 u8 __iomem *base;
453 u8 pos, flags;
454 u64 addr = 0;
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_MSI_MAPPING)
462 break;
463 }
464 }
465
466 if (pos == 0)
467 return;
468
469 base = devbase + pos;
470
471 flags = readb(base + HT_MSI_FLAGS);
472 if (!(flags & HT_MSI_FLAGS_FIXED)) {
473 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
474 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
475 }
476
477 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
478 PCI_SLOT(devfn), PCI_FUNC(devfn),
479 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
480
481 if (!(flags & HT_MSI_FLAGS_ENABLE))
482 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
483 }
484 #else
485 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
486 unsigned int devfn)
487 {
488 return;
489 }
490 #endif
491
492 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
493 unsigned int devfn, u32 vdid)
494 {
495 int i, irq, n;
496 u8 __iomem *base;
497 u32 tmp;
498 u8 pos;
499
500 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
501 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
502 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
503 if (id == PCI_CAP_ID_HT) {
504 id = readb(devbase + pos + 3);
505 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
506 break;
507 }
508 }
509 if (pos == 0)
510 return;
511
512 base = devbase + pos;
513 writeb(0x01, base + 2);
514 n = (readl(base + 4) >> 16) & 0xff;
515
516 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
517 " has %d irqs\n",
518 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
519
520 for (i = 0; i <= n; i++) {
521 writeb(0x10 + 2 * i, base + 2);
522 tmp = readl(base + 4);
523 irq = (tmp >> 16) & 0xff;
524 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
525 /* mask it , will be unmasked later */
526 tmp |= 0x1;
527 writel(tmp, base + 4);
528 mpic->fixups[irq].index = i;
529 mpic->fixups[irq].base = base;
530 /* Apple HT PIC has a non-standard way of doing EOIs */
531 if ((vdid & 0xffff) == 0x106b)
532 mpic->fixups[irq].applebase = devbase + 0x60;
533 else
534 mpic->fixups[irq].applebase = NULL;
535 writeb(0x11 + 2 * i, base + 2);
536 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
537 }
538 }
539
540
541 static void __init mpic_scan_ht_pics(struct mpic *mpic)
542 {
543 unsigned int devfn;
544 u8 __iomem *cfgspace;
545
546 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
547
548 /* Allocate fixups array */
549 mpic->fixups = kcalloc(128, sizeof(*mpic->fixups), GFP_KERNEL);
550 BUG_ON(mpic->fixups == NULL);
551
552 /* Init spinlock */
553 raw_spin_lock_init(&mpic->fixup_lock);
554
555 /* Map U3 config space. We assume all IO-APICs are on the primary bus
556 * so we only need to map 64kB.
557 */
558 cfgspace = ioremap(0xf2000000, 0x10000);
559 BUG_ON(cfgspace == NULL);
560
561 /* Now we scan all slots. We do a very quick scan, we read the header
562 * type, vendor ID and device ID only, that's plenty enough
563 */
564 for (devfn = 0; devfn < 0x100; devfn++) {
565 u8 __iomem *devbase = cfgspace + (devfn << 8);
566 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
567 u32 l = readl(devbase + PCI_VENDOR_ID);
568 u16 s;
569
570 DBG("devfn %x, l: %x\n", devfn, l);
571
572 /* If no device, skip */
573 if (l == 0xffffffff || l == 0x00000000 ||
574 l == 0x0000ffff || l == 0xffff0000)
575 goto next;
576 /* Check if is supports capability lists */
577 s = readw(devbase + PCI_STATUS);
578 if (!(s & PCI_STATUS_CAP_LIST))
579 goto next;
580
581 mpic_scan_ht_pic(mpic, devbase, devfn, l);
582 mpic_scan_ht_msi(mpic, devbase, devfn);
583
584 next:
585 /* next device, if function 0 */
586 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
587 devfn += 7;
588 }
589 }
590
591 #else /* CONFIG_MPIC_U3_HT_IRQS */
592
593 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
594 {
595 return 0;
596 }
597
598 static void __init mpic_scan_ht_pics(struct mpic *mpic)
599 {
600 }
601
602 #endif /* CONFIG_MPIC_U3_HT_IRQS */
603
604 /* Find an mpic associated with a given linux interrupt */
605 static struct mpic *mpic_find(unsigned int irq)
606 {
607 if (irq < NR_IRQS_LEGACY)
608 return NULL;
609
610 return irq_get_chip_data(irq);
611 }
612
613 /* Determine if the linux irq is an IPI */
614 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src)
615 {
616 return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
617 }
618
619 /* Determine if the linux irq is a timer */
620 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src)
621 {
622 return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]);
623 }
624
625 /* Convert a cpu mask from logical to physical cpu numbers. */
626 static inline u32 mpic_physmask(u32 cpumask)
627 {
628 int i;
629 u32 mask = 0;
630
631 for (i = 0; i < min(32, NR_CPUS) && cpu_possible(i); ++i, cpumask >>= 1)
632 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
633 return mask;
634 }
635
636 #ifdef CONFIG_SMP
637 /* Get the mpic structure from the IPI number */
638 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
639 {
640 return irq_data_get_irq_chip_data(d);
641 }
642 #endif
643
644 /* Get the mpic structure from the irq number */
645 static inline struct mpic * mpic_from_irq(unsigned int irq)
646 {
647 return irq_get_chip_data(irq);
648 }
649
650 /* Get the mpic structure from the irq data */
651 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
652 {
653 return irq_data_get_irq_chip_data(d);
654 }
655
656 /* Send an EOI */
657 static inline void mpic_eoi(struct mpic *mpic)
658 {
659 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
660 }
661
662 /*
663 * Linux descriptor level callbacks
664 */
665
666
667 void mpic_unmask_irq(struct irq_data *d)
668 {
669 unsigned int loops = 100000;
670 struct mpic *mpic = mpic_from_irq_data(d);
671 unsigned int src = irqd_to_hwirq(d);
672
673 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
674
675 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
676 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
677 ~MPIC_VECPRI_MASK);
678 /* make sure mask gets to controller before we return to user */
679 do {
680 if (!loops--) {
681 printk(KERN_ERR "%s: timeout on hwirq %u\n",
682 __func__, src);
683 break;
684 }
685 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
686 }
687
688 void mpic_mask_irq(struct irq_data *d)
689 {
690 unsigned int loops = 100000;
691 struct mpic *mpic = mpic_from_irq_data(d);
692 unsigned int src = irqd_to_hwirq(d);
693
694 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
695
696 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
697 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
698 MPIC_VECPRI_MASK);
699
700 /* make sure mask gets to controller before we return to user */
701 do {
702 if (!loops--) {
703 printk(KERN_ERR "%s: timeout on hwirq %u\n",
704 __func__, src);
705 break;
706 }
707 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
708 }
709
710 void mpic_end_irq(struct irq_data *d)
711 {
712 struct mpic *mpic = mpic_from_irq_data(d);
713
714 #ifdef DEBUG_IRQ
715 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
716 #endif
717 /* We always EOI on end_irq() even for edge interrupts since that
718 * should only lower the priority, the MPIC should have properly
719 * latched another edge interrupt coming in anyway
720 */
721
722 mpic_eoi(mpic);
723 }
724
725 #ifdef CONFIG_MPIC_U3_HT_IRQS
726
727 static void mpic_unmask_ht_irq(struct irq_data *d)
728 {
729 struct mpic *mpic = mpic_from_irq_data(d);
730 unsigned int src = irqd_to_hwirq(d);
731
732 mpic_unmask_irq(d);
733
734 if (irqd_is_level_type(d))
735 mpic_ht_end_irq(mpic, src);
736 }
737
738 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
739 {
740 struct mpic *mpic = mpic_from_irq_data(d);
741 unsigned int src = irqd_to_hwirq(d);
742
743 mpic_unmask_irq(d);
744 mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
745
746 return 0;
747 }
748
749 static void mpic_shutdown_ht_irq(struct irq_data *d)
750 {
751 struct mpic *mpic = mpic_from_irq_data(d);
752 unsigned int src = irqd_to_hwirq(d);
753
754 mpic_shutdown_ht_interrupt(mpic, src);
755 mpic_mask_irq(d);
756 }
757
758 static void mpic_end_ht_irq(struct irq_data *d)
759 {
760 struct mpic *mpic = mpic_from_irq_data(d);
761 unsigned int src = irqd_to_hwirq(d);
762
763 #ifdef DEBUG_IRQ
764 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
765 #endif
766 /* We always EOI on end_irq() even for edge interrupts since that
767 * should only lower the priority, the MPIC should have properly
768 * latched another edge interrupt coming in anyway
769 */
770
771 if (irqd_is_level_type(d))
772 mpic_ht_end_irq(mpic, src);
773 mpic_eoi(mpic);
774 }
775 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
776
777 #ifdef CONFIG_SMP
778
779 static void mpic_unmask_ipi(struct irq_data *d)
780 {
781 struct mpic *mpic = mpic_from_ipi(d);
782 unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0];
783
784 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
785 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
786 }
787
788 static void mpic_mask_ipi(struct irq_data *d)
789 {
790 /* NEVER disable an IPI... that's just plain wrong! */
791 }
792
793 static void mpic_end_ipi(struct irq_data *d)
794 {
795 struct mpic *mpic = mpic_from_ipi(d);
796
797 /*
798 * IPIs are marked IRQ_PER_CPU. This has the side effect of
799 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
800 * applying to them. We EOI them late to avoid re-entering.
801 */
802 mpic_eoi(mpic);
803 }
804
805 #endif /* CONFIG_SMP */
806
807 static void mpic_unmask_tm(struct irq_data *d)
808 {
809 struct mpic *mpic = mpic_from_irq_data(d);
810 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
811
812 DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src);
813 mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK);
814 mpic_tm_read(src);
815 }
816
817 static void mpic_mask_tm(struct irq_data *d)
818 {
819 struct mpic *mpic = mpic_from_irq_data(d);
820 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
821
822 mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK);
823 mpic_tm_read(src);
824 }
825
826 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
827 bool force)
828 {
829 struct mpic *mpic = mpic_from_irq_data(d);
830 unsigned int src = irqd_to_hwirq(d);
831
832 if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
833 int cpuid = irq_choose_cpu(cpumask);
834
835 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
836 } else {
837 u32 mask = cpumask_bits(cpumask)[0];
838
839 mask &= cpumask_bits(cpu_online_mask)[0];
840
841 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
842 mpic_physmask(mask));
843 }
844
845 return IRQ_SET_MASK_OK;
846 }
847
848 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
849 {
850 /* Now convert sense value */
851 switch(type & IRQ_TYPE_SENSE_MASK) {
852 case IRQ_TYPE_EDGE_RISING:
853 return MPIC_INFO(VECPRI_SENSE_EDGE) |
854 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
855 case IRQ_TYPE_EDGE_FALLING:
856 case IRQ_TYPE_EDGE_BOTH:
857 return MPIC_INFO(VECPRI_SENSE_EDGE) |
858 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
859 case IRQ_TYPE_LEVEL_HIGH:
860 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
861 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
862 case IRQ_TYPE_LEVEL_LOW:
863 default:
864 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
865 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
866 }
867 }
868
869 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
870 {
871 struct mpic *mpic = mpic_from_irq_data(d);
872 unsigned int src = irqd_to_hwirq(d);
873 unsigned int vecpri, vold, vnew;
874
875 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
876 mpic, d->irq, src, flow_type);
877
878 if (src >= mpic->num_sources)
879 return -EINVAL;
880
881 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
882
883 /* We don't support "none" type */
884 if (flow_type == IRQ_TYPE_NONE)
885 flow_type = IRQ_TYPE_DEFAULT;
886
887 /* Default: read HW settings */
888 if (flow_type == IRQ_TYPE_DEFAULT) {
889 int vold_ps;
890
891 vold_ps = vold & (MPIC_INFO(VECPRI_POLARITY_MASK) |
892 MPIC_INFO(VECPRI_SENSE_MASK));
893
894 if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) |
895 MPIC_INFO(VECPRI_POLARITY_POSITIVE)))
896 flow_type = IRQ_TYPE_EDGE_RISING;
897 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) |
898 MPIC_INFO(VECPRI_POLARITY_NEGATIVE)))
899 flow_type = IRQ_TYPE_EDGE_FALLING;
900 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) |
901 MPIC_INFO(VECPRI_POLARITY_POSITIVE)))
902 flow_type = IRQ_TYPE_LEVEL_HIGH;
903 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) |
904 MPIC_INFO(VECPRI_POLARITY_NEGATIVE)))
905 flow_type = IRQ_TYPE_LEVEL_LOW;
906 else
907 WARN_ONCE(1, "mpic: unknown IRQ type %d\n", vold);
908 }
909
910 /* Apply to irq desc */
911 irqd_set_trigger_type(d, flow_type);
912
913 /* Apply to HW */
914 if (mpic_is_ht_interrupt(mpic, src))
915 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
916 MPIC_VECPRI_SENSE_EDGE;
917 else
918 vecpri = mpic_type_to_vecpri(mpic, flow_type);
919
920 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
921 MPIC_INFO(VECPRI_SENSE_MASK));
922 vnew |= vecpri;
923 if (vold != vnew)
924 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
925
926 return IRQ_SET_MASK_OK_NOCOPY;
927 }
928
929 void mpic_set_vector(unsigned int virq, unsigned int vector)
930 {
931 struct mpic *mpic = mpic_from_irq(virq);
932 unsigned int src = virq_to_hw(virq);
933 unsigned int vecpri;
934
935 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
936 mpic, virq, src, vector);
937
938 if (src >= mpic->num_sources)
939 return;
940
941 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
942 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
943 vecpri |= vector;
944 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
945 }
946
947 static void mpic_set_destination(unsigned int virq, unsigned int cpuid)
948 {
949 struct mpic *mpic = mpic_from_irq(virq);
950 unsigned int src = virq_to_hw(virq);
951
952 DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
953 mpic, virq, src, cpuid);
954
955 if (src >= mpic->num_sources)
956 return;
957
958 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
959 }
960
961 static struct irq_chip mpic_irq_chip = {
962 .irq_mask = mpic_mask_irq,
963 .irq_unmask = mpic_unmask_irq,
964 .irq_eoi = mpic_end_irq,
965 .irq_set_type = mpic_set_irq_type,
966 };
967
968 #ifdef CONFIG_SMP
969 static const struct irq_chip mpic_ipi_chip = {
970 .irq_mask = mpic_mask_ipi,
971 .irq_unmask = mpic_unmask_ipi,
972 .irq_eoi = mpic_end_ipi,
973 };
974 #endif /* CONFIG_SMP */
975
976 static struct irq_chip mpic_tm_chip = {
977 .irq_mask = mpic_mask_tm,
978 .irq_unmask = mpic_unmask_tm,
979 .irq_eoi = mpic_end_irq,
980 };
981
982 #ifdef CONFIG_MPIC_U3_HT_IRQS
983 static const struct irq_chip mpic_irq_ht_chip = {
984 .irq_startup = mpic_startup_ht_irq,
985 .irq_shutdown = mpic_shutdown_ht_irq,
986 .irq_mask = mpic_mask_irq,
987 .irq_unmask = mpic_unmask_ht_irq,
988 .irq_eoi = mpic_end_ht_irq,
989 .irq_set_type = mpic_set_irq_type,
990 };
991 #endif /* CONFIG_MPIC_U3_HT_IRQS */
992
993
994 static int mpic_host_match(struct irq_domain *h, struct device_node *node,
995 enum irq_domain_bus_token bus_token)
996 {
997 /* Exact match, unless mpic node is NULL */
998 struct device_node *of_node = irq_domain_get_of_node(h);
999 return of_node == NULL || of_node == node;
1000 }
1001
1002 static int mpic_host_map(struct irq_domain *h, unsigned int virq,
1003 irq_hw_number_t hw)
1004 {
1005 struct mpic *mpic = h->host_data;
1006 struct irq_chip *chip;
1007
1008 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
1009
1010 if (hw == mpic->spurious_vec)
1011 return -EINVAL;
1012 if (mpic->protected && test_bit(hw, mpic->protected)) {
1013 pr_warn("mpic: Mapping of source 0x%x failed, source protected by firmware !\n",
1014 (unsigned int)hw);
1015 return -EPERM;
1016 }
1017
1018 #ifdef CONFIG_SMP
1019 else if (hw >= mpic->ipi_vecs[0]) {
1020 WARN_ON(mpic->flags & MPIC_SECONDARY);
1021
1022 DBG("mpic: mapping as IPI\n");
1023 irq_set_chip_data(virq, mpic);
1024 irq_set_chip_and_handler(virq, &mpic->hc_ipi,
1025 handle_percpu_irq);
1026 return 0;
1027 }
1028 #endif /* CONFIG_SMP */
1029
1030 if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
1031 WARN_ON(mpic->flags & MPIC_SECONDARY);
1032
1033 DBG("mpic: mapping as timer\n");
1034 irq_set_chip_data(virq, mpic);
1035 irq_set_chip_and_handler(virq, &mpic->hc_tm,
1036 handle_fasteoi_irq);
1037 return 0;
1038 }
1039
1040 if (mpic_map_error_int(mpic, virq, hw))
1041 return 0;
1042
1043 if (hw >= mpic->num_sources) {
1044 pr_warn("mpic: Mapping of source 0x%x failed, source out of range !\n",
1045 (unsigned int)hw);
1046 return -EINVAL;
1047 }
1048
1049 mpic_msi_reserve_hwirq(mpic, hw);
1050
1051 /* Default chip */
1052 chip = &mpic->hc_irq;
1053
1054 #ifdef CONFIG_MPIC_U3_HT_IRQS
1055 /* Check for HT interrupts, override vecpri */
1056 if (mpic_is_ht_interrupt(mpic, hw))
1057 chip = &mpic->hc_ht_irq;
1058 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1059
1060 DBG("mpic: mapping to irq chip @%p\n", chip);
1061
1062 irq_set_chip_data(virq, mpic);
1063 irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1064
1065 /* Set default irq type */
1066 irq_set_irq_type(virq, IRQ_TYPE_DEFAULT);
1067
1068 /* If the MPIC was reset, then all vectors have already been
1069 * initialized. Otherwise, a per source lazy initialization
1070 * is done here.
1071 */
1072 if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1073 int cpu;
1074
1075 preempt_disable();
1076 cpu = mpic_processor_id(mpic);
1077 preempt_enable();
1078
1079 mpic_set_vector(virq, hw);
1080 mpic_set_destination(virq, cpu);
1081 mpic_irq_set_priority(virq, 8);
1082 }
1083
1084 return 0;
1085 }
1086
1087 static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
1088 const u32 *intspec, unsigned int intsize,
1089 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1090
1091 {
1092 struct mpic *mpic = h->host_data;
1093 static unsigned char map_mpic_senses[4] = {
1094 IRQ_TYPE_EDGE_RISING,
1095 IRQ_TYPE_LEVEL_LOW,
1096 IRQ_TYPE_LEVEL_HIGH,
1097 IRQ_TYPE_EDGE_FALLING,
1098 };
1099
1100 *out_hwirq = intspec[0];
1101 if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
1102 /*
1103 * Freescale MPIC with extended intspec:
1104 * First two cells are as usual. Third specifies
1105 * an "interrupt type". Fourth is type-specific data.
1106 *
1107 * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
1108 */
1109 switch (intspec[2]) {
1110 case 0:
1111 break;
1112 case 1:
1113 if (!(mpic->flags & MPIC_FSL_HAS_EIMR))
1114 break;
1115
1116 if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs))
1117 return -EINVAL;
1118
1119 *out_hwirq = mpic->err_int_vecs[intspec[3]];
1120
1121 break;
1122 case 2:
1123 if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
1124 return -EINVAL;
1125
1126 *out_hwirq = mpic->ipi_vecs[intspec[0]];
1127 break;
1128 case 3:
1129 if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
1130 return -EINVAL;
1131
1132 *out_hwirq = mpic->timer_vecs[intspec[0]];
1133 break;
1134 default:
1135 pr_debug("%s: unknown irq type %u\n",
1136 __func__, intspec[2]);
1137 return -EINVAL;
1138 }
1139
1140 *out_flags = map_mpic_senses[intspec[1] & 3];
1141 } else if (intsize > 1) {
1142 u32 mask = 0x3;
1143
1144 /* Apple invented a new race of encoding on machines with
1145 * an HT APIC. They encode, among others, the index within
1146 * the HT APIC. We don't care about it here since thankfully,
1147 * it appears that they have the APIC already properly
1148 * configured, and thus our current fixup code that reads the
1149 * APIC config works fine. However, we still need to mask out
1150 * bits in the specifier to make sure we only get bit 0 which
1151 * is the level/edge bit (the only sense bit exposed by Apple),
1152 * as their bit 1 means something else.
1153 */
1154 if (machine_is(powermac))
1155 mask = 0x1;
1156 *out_flags = map_mpic_senses[intspec[1] & mask];
1157 } else
1158 *out_flags = IRQ_TYPE_NONE;
1159
1160 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1161 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1162
1163 return 0;
1164 }
1165
1166 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
1167 static void mpic_cascade(struct irq_desc *desc)
1168 {
1169 struct irq_chip *chip = irq_desc_get_chip(desc);
1170 struct mpic *mpic = irq_desc_get_handler_data(desc);
1171 unsigned int virq;
1172
1173 BUG_ON(!(mpic->flags & MPIC_SECONDARY));
1174
1175 virq = mpic_get_one_irq(mpic);
1176 if (virq)
1177 generic_handle_irq(virq);
1178
1179 chip->irq_eoi(&desc->irq_data);
1180 }
1181
1182 static const struct irq_domain_ops mpic_host_ops = {
1183 .match = mpic_host_match,
1184 .map = mpic_host_map,
1185 .xlate = mpic_host_xlate,
1186 };
1187
1188 static u32 fsl_mpic_get_version(struct mpic *mpic)
1189 {
1190 u32 brr1;
1191
1192 if (!(mpic->flags & MPIC_FSL))
1193 return 0;
1194
1195 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
1196 MPIC_FSL_BRR1);
1197
1198 return brr1 & MPIC_FSL_BRR1_VER;
1199 }
1200
1201 /*
1202 * Exported functions
1203 */
1204
1205 u32 fsl_mpic_primary_get_version(void)
1206 {
1207 struct mpic *mpic = mpic_primary;
1208
1209 if (mpic)
1210 return fsl_mpic_get_version(mpic);
1211
1212 return 0;
1213 }
1214
1215 struct mpic * __init mpic_alloc(struct device_node *node,
1216 phys_addr_t phys_addr,
1217 unsigned int flags,
1218 unsigned int isu_size,
1219 unsigned int irq_count,
1220 const char *name)
1221 {
1222 int i, psize, intvec_top;
1223 struct mpic *mpic;
1224 u32 greg_feature;
1225 const char *vers;
1226 const u32 *psrc;
1227 u32 last_irq;
1228 u32 fsl_version = 0;
1229
1230 /* Default MPIC search parameters */
1231 static const struct of_device_id __initconst mpic_device_id[] = {
1232 { .type = "open-pic", },
1233 { .compatible = "open-pic", },
1234 {},
1235 };
1236
1237 /*
1238 * If we were not passed a device-tree node, then perform the default
1239 * search for standardized a standardized OpenPIC.
1240 */
1241 if (node) {
1242 node = of_node_get(node);
1243 } else {
1244 node = of_find_matching_node(NULL, mpic_device_id);
1245 if (!node)
1246 return NULL;
1247 }
1248
1249 /* Pick the physical address from the device tree if unspecified */
1250 if (!phys_addr) {
1251 /* Check if it is DCR-based */
1252 if (of_property_read_bool(node, "dcr-reg")) {
1253 flags |= MPIC_USES_DCR;
1254 } else {
1255 struct resource r;
1256 if (of_address_to_resource(node, 0, &r))
1257 goto err_of_node_put;
1258 phys_addr = r.start;
1259 }
1260 }
1261
1262 /* Read extra device-tree properties into the flags variable */
1263 if (of_property_read_bool(node, "big-endian"))
1264 flags |= MPIC_BIG_ENDIAN;
1265 if (of_property_read_bool(node, "pic-no-reset"))
1266 flags |= MPIC_NO_RESET;
1267 if (of_property_read_bool(node, "single-cpu-affinity"))
1268 flags |= MPIC_SINGLE_DEST_CPU;
1269 if (of_device_is_compatible(node, "fsl,mpic")) {
1270 flags |= MPIC_FSL | MPIC_LARGE_VECTORS;
1271 mpic_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
1272 mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
1273 }
1274
1275 mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1276 if (mpic == NULL)
1277 goto err_of_node_put;
1278
1279 mpic->name = name;
1280 mpic->node = node;
1281 mpic->paddr = phys_addr;
1282 mpic->flags = flags;
1283
1284 mpic->hc_irq = mpic_irq_chip;
1285 mpic->hc_irq.name = name;
1286 if (!(mpic->flags & MPIC_SECONDARY))
1287 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1288 #ifdef CONFIG_MPIC_U3_HT_IRQS
1289 mpic->hc_ht_irq = mpic_irq_ht_chip;
1290 mpic->hc_ht_irq.name = name;
1291 if (!(mpic->flags & MPIC_SECONDARY))
1292 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1293 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1294
1295 #ifdef CONFIG_SMP
1296 mpic->hc_ipi = mpic_ipi_chip;
1297 mpic->hc_ipi.name = name;
1298 #endif /* CONFIG_SMP */
1299
1300 mpic->hc_tm = mpic_tm_chip;
1301 mpic->hc_tm.name = name;
1302
1303 mpic->num_sources = 0; /* so far */
1304
1305 if (mpic->flags & MPIC_LARGE_VECTORS)
1306 intvec_top = 2047;
1307 else
1308 intvec_top = 255;
1309
1310 mpic->timer_vecs[0] = intvec_top - 12;
1311 mpic->timer_vecs[1] = intvec_top - 11;
1312 mpic->timer_vecs[2] = intvec_top - 10;
1313 mpic->timer_vecs[3] = intvec_top - 9;
1314 mpic->timer_vecs[4] = intvec_top - 8;
1315 mpic->timer_vecs[5] = intvec_top - 7;
1316 mpic->timer_vecs[6] = intvec_top - 6;
1317 mpic->timer_vecs[7] = intvec_top - 5;
1318 mpic->ipi_vecs[0] = intvec_top - 4;
1319 mpic->ipi_vecs[1] = intvec_top - 3;
1320 mpic->ipi_vecs[2] = intvec_top - 2;
1321 mpic->ipi_vecs[3] = intvec_top - 1;
1322 mpic->spurious_vec = intvec_top;
1323
1324 /* Look for protected sources */
1325 psrc = of_get_property(mpic->node, "protected-sources", &psize);
1326 if (psrc) {
1327 /* Allocate a bitmap with one bit per interrupt */
1328 mpic->protected = bitmap_zalloc(intvec_top + 1, GFP_KERNEL);
1329 BUG_ON(mpic->protected == NULL);
1330 for (i = 0; i < psize/sizeof(u32); i++) {
1331 if (psrc[i] > intvec_top)
1332 continue;
1333 __set_bit(psrc[i], mpic->protected);
1334 }
1335 }
1336
1337 #ifdef CONFIG_MPIC_WEIRD
1338 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
1339 #endif
1340
1341 /* default register type */
1342 if (mpic->flags & MPIC_BIG_ENDIAN)
1343 mpic->reg_type = mpic_access_mmio_be;
1344 else
1345 mpic->reg_type = mpic_access_mmio_le;
1346
1347 /*
1348 * An MPIC with a "dcr-reg" property must be accessed that way, but
1349 * only if the kernel includes DCR support.
1350 */
1351 #ifdef CONFIG_PPC_DCR
1352 if (mpic->flags & MPIC_USES_DCR)
1353 mpic->reg_type = mpic_access_dcr;
1354 #else
1355 BUG_ON(mpic->flags & MPIC_USES_DCR);
1356 #endif
1357
1358 /* Map the global registers */
1359 mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1360 mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1361
1362 if (mpic->flags & MPIC_FSL) {
1363 int ret;
1364
1365 /*
1366 * Yes, Freescale really did put global registers in the
1367 * magic per-cpu area -- and they don't even show up in the
1368 * non-magic per-cpu copies that this driver normally uses.
1369 */
1370 mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
1371 MPIC_CPU_THISBASE, 0x1000);
1372
1373 fsl_version = fsl_mpic_get_version(mpic);
1374
1375 /* Error interrupt mask register (EIMR) is required for
1376 * handling individual device error interrupts. EIMR
1377 * was added in MPIC version 4.1.
1378 *
1379 * Over here we reserve vector number space for error
1380 * interrupt vectors. This space is stolen from the
1381 * global vector number space, as in case of ipis
1382 * and timer interrupts.
1383 *
1384 * Available vector space = intvec_top - 13, where 13
1385 * is the number of vectors which have been consumed by
1386 * ipis, timer interrupts and spurious.
1387 */
1388 if (fsl_version >= 0x401) {
1389 ret = mpic_setup_error_int(mpic, intvec_top - 13);
1390 if (ret)
1391 return NULL;
1392 }
1393
1394 }
1395
1396 /*
1397 * EPR is only available starting with v4.0. To support
1398 * platforms that don't know the MPIC version at compile-time,
1399 * such as qemu-e500, turn off coreint if this MPIC doesn't
1400 * support it. Note that we never enable it if it wasn't
1401 * requested in the first place.
1402 *
1403 * This is done outside the MPIC_FSL check, so that we
1404 * also disable coreint if the MPIC node doesn't have
1405 * an "fsl,mpic" compatible at all. This will be the case
1406 * with device trees generated by older versions of QEMU.
1407 * fsl_version will be zero if MPIC_FSL is not set.
1408 */
1409 if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT))
1410 ppc_md.get_irq = mpic_get_irq;
1411
1412 /* Reset */
1413
1414 /* When using a device-node, reset requests are only honored if the MPIC
1415 * is allowed to reset.
1416 */
1417 if (!(mpic->flags & MPIC_NO_RESET)) {
1418 printk(KERN_DEBUG "mpic: Resetting\n");
1419 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1420 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1421 | MPIC_GREG_GCONF_RESET);
1422 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1423 & MPIC_GREG_GCONF_RESET)
1424 mb();
1425 }
1426
1427 /* CoreInt */
1428 if (mpic->flags & MPIC_ENABLE_COREINT)
1429 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1430 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1431 | MPIC_GREG_GCONF_COREINT);
1432
1433 if (mpic->flags & MPIC_ENABLE_MCK)
1434 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1435 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1436 | MPIC_GREG_GCONF_MCK);
1437
1438 /*
1439 * The MPIC driver will crash if there are more cores than we
1440 * can initialize, so we may as well catch that problem here.
1441 */
1442 BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
1443
1444 /* Map the per-CPU registers */
1445 for_each_possible_cpu(i) {
1446 unsigned int cpu = get_hard_smp_processor_id(i);
1447
1448 mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
1449 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
1450 0x1000);
1451 }
1452
1453 /*
1454 * Read feature register. For non-ISU MPICs, num sources as well. On
1455 * ISU MPICs, sources are counted as ISUs are added
1456 */
1457 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1458
1459 /*
1460 * By default, the last source number comes from the MPIC, but the
1461 * device-tree and board support code can override it on buggy hw.
1462 * If we get passed an isu_size (multi-isu MPIC) then we use that
1463 * as a default instead of the value read from the HW.
1464 */
1465 last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1466 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
1467 if (isu_size)
1468 last_irq = isu_size * MPIC_MAX_ISU - 1;
1469 of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
1470 if (irq_count)
1471 last_irq = irq_count - 1;
1472
1473 /* Initialize main ISU if none provided */
1474 if (!isu_size) {
1475 isu_size = last_irq + 1;
1476 mpic->num_sources = isu_size;
1477 mpic_map(mpic, mpic->paddr, &mpic->isus[0],
1478 MPIC_INFO(IRQ_BASE),
1479 MPIC_INFO(IRQ_STRIDE) * isu_size);
1480 }
1481
1482 mpic->isu_size = isu_size;
1483 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1484 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1485
1486 mpic->irqhost = irq_domain_add_linear(mpic->node,
1487 intvec_top,
1488 &mpic_host_ops, mpic);
1489
1490 /*
1491 * FIXME: The code leaks the MPIC object and mappings here; this
1492 * is very unlikely to fail but it ought to be fixed anyways.
1493 */
1494 if (mpic->irqhost == NULL)
1495 return NULL;
1496
1497 /* Display version */
1498 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1499 case 1:
1500 vers = "1.0";
1501 break;
1502 case 2:
1503 vers = "1.2";
1504 break;
1505 case 3:
1506 vers = "1.3";
1507 break;
1508 default:
1509 vers = "<unknown>";
1510 break;
1511 }
1512 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1513 " max %d CPUs\n",
1514 name, vers, (unsigned long long)mpic->paddr, num_possible_cpus());
1515 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1516 mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1517
1518 mpic->next = mpics;
1519 mpics = mpic;
1520
1521 if (!(mpic->flags & MPIC_SECONDARY)) {
1522 mpic_primary = mpic;
1523 irq_set_default_host(mpic->irqhost);
1524 }
1525
1526 return mpic;
1527
1528 err_of_node_put:
1529 of_node_put(node);
1530 return NULL;
1531 }
1532
1533 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1534 phys_addr_t paddr)
1535 {
1536 unsigned int isu_first = isu_num * mpic->isu_size;
1537
1538 BUG_ON(isu_num >= MPIC_MAX_ISU);
1539
1540 mpic_map(mpic,
1541 paddr, &mpic->isus[isu_num], 0,
1542 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1543
1544 if ((isu_first + mpic->isu_size) > mpic->num_sources)
1545 mpic->num_sources = isu_first + mpic->isu_size;
1546 }
1547
1548 void __init mpic_init(struct mpic *mpic)
1549 {
1550 int i, cpu;
1551 int num_timers = 4;
1552
1553 BUG_ON(mpic->num_sources == 0);
1554
1555 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1556
1557 /* Set current processor priority to max */
1558 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1559
1560 if (mpic->flags & MPIC_FSL) {
1561 u32 version = fsl_mpic_get_version(mpic);
1562
1563 /*
1564 * Timer group B is present at the latest in MPIC 3.1 (e.g.
1565 * mpc8536). It is not present in MPIC 2.0 (e.g. mpc8544).
1566 * I don't know about the status of intermediate versions (or
1567 * whether they even exist).
1568 */
1569 if (version >= 0x0301)
1570 num_timers = 8;
1571 }
1572
1573 /* Initialize timers to our reserved vectors and mask them for now */
1574 for (i = 0; i < num_timers; i++) {
1575 unsigned int offset = mpic_tm_offset(mpic, i);
1576
1577 mpic_write(mpic->tmregs,
1578 offset + MPIC_INFO(TIMER_DESTINATION),
1579 1 << hard_smp_processor_id());
1580 mpic_write(mpic->tmregs,
1581 offset + MPIC_INFO(TIMER_VECTOR_PRI),
1582 MPIC_VECPRI_MASK |
1583 (9 << MPIC_VECPRI_PRIORITY_SHIFT) |
1584 (mpic->timer_vecs[0] + i));
1585 }
1586
1587 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1588 mpic_test_broken_ipi(mpic);
1589 for (i = 0; i < 4; i++) {
1590 mpic_ipi_write(i,
1591 MPIC_VECPRI_MASK |
1592 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1593 (mpic->ipi_vecs[0] + i));
1594 }
1595
1596 /* Do the HT PIC fixups on U3 broken mpic */
1597 DBG("MPIC flags: %x\n", mpic->flags);
1598 if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
1599 mpic_scan_ht_pics(mpic);
1600 mpic_u3msi_init(mpic);
1601 }
1602
1603 mpic_pasemi_msi_init(mpic);
1604
1605 cpu = mpic_processor_id(mpic);
1606
1607 if (!(mpic->flags & MPIC_NO_RESET)) {
1608 for (i = 0; i < mpic->num_sources; i++) {
1609 /* start with vector = source number, and masked */
1610 u32 vecpri = MPIC_VECPRI_MASK | i |
1611 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1612
1613 /* check if protected */
1614 if (mpic->protected && test_bit(i, mpic->protected))
1615 continue;
1616 /* init hw */
1617 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1618 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1619 }
1620 }
1621
1622 /* Init spurious vector */
1623 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1624
1625 /* Disable 8259 passthrough, if supported */
1626 if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1627 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1628 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1629 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1630
1631 if (mpic->flags & MPIC_NO_BIAS)
1632 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1633 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1634 | MPIC_GREG_GCONF_NO_BIAS);
1635
1636 /* Set current processor priority to 0 */
1637 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1638
1639 #ifdef CONFIG_PM
1640 /* allocate memory to save mpic state */
1641 mpic->save_data = kmalloc_array(mpic->num_sources,
1642 sizeof(*mpic->save_data),
1643 GFP_KERNEL);
1644 BUG_ON(mpic->save_data == NULL);
1645 #endif
1646
1647 /* Check if this MPIC is chained from a parent interrupt controller */
1648 if (mpic->flags & MPIC_SECONDARY) {
1649 int virq = irq_of_parse_and_map(mpic->node, 0);
1650 if (virq) {
1651 printk(KERN_INFO "%pOF: hooking up to IRQ %d\n",
1652 mpic->node, virq);
1653 irq_set_handler_data(virq, mpic);
1654 irq_set_chained_handler(virq, &mpic_cascade);
1655 }
1656 }
1657
1658 /* FSL mpic error interrupt initialization */
1659 if (mpic->flags & MPIC_FSL_HAS_EIMR)
1660 mpic_err_int_init(mpic, MPIC_FSL_ERR_INT);
1661 }
1662
1663 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1664 {
1665 struct mpic *mpic = mpic_find(irq);
1666 unsigned int src = virq_to_hw(irq);
1667 unsigned long flags;
1668 u32 reg;
1669
1670 if (!mpic)
1671 return;
1672
1673 raw_spin_lock_irqsave(&mpic_lock, flags);
1674 if (mpic_is_ipi(mpic, src)) {
1675 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1676 ~MPIC_VECPRI_PRIORITY_MASK;
1677 mpic_ipi_write(src - mpic->ipi_vecs[0],
1678 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1679 } else if (mpic_is_tm(mpic, src)) {
1680 reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
1681 ~MPIC_VECPRI_PRIORITY_MASK;
1682 mpic_tm_write(src - mpic->timer_vecs[0],
1683 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1684 } else {
1685 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1686 & ~MPIC_VECPRI_PRIORITY_MASK;
1687 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1688 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1689 }
1690 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1691 }
1692
1693 void mpic_setup_this_cpu(void)
1694 {
1695 #ifdef CONFIG_SMP
1696 struct mpic *mpic = mpic_primary;
1697 unsigned long flags;
1698 u32 msk = 1 << hard_smp_processor_id();
1699 unsigned int i;
1700
1701 BUG_ON(mpic == NULL);
1702
1703 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1704
1705 raw_spin_lock_irqsave(&mpic_lock, flags);
1706
1707 /* let the mpic know we want intrs. default affinity is 0xffffffff
1708 * until changed via /proc. That's how it's done on x86. If we want
1709 * it differently, then we should make sure we also change the default
1710 * values of irq_desc[].affinity in irq.c.
1711 */
1712 if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) {
1713 for (i = 0; i < mpic->num_sources ; i++)
1714 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1715 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1716 }
1717
1718 /* Set current processor priority to 0 */
1719 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1720
1721 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1722 #endif /* CONFIG_SMP */
1723 }
1724
1725 int mpic_cpu_get_priority(void)
1726 {
1727 struct mpic *mpic = mpic_primary;
1728
1729 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1730 }
1731
1732 void mpic_cpu_set_priority(int prio)
1733 {
1734 struct mpic *mpic = mpic_primary;
1735
1736 prio &= MPIC_CPU_TASKPRI_MASK;
1737 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1738 }
1739
1740 void mpic_teardown_this_cpu(int secondary)
1741 {
1742 struct mpic *mpic = mpic_primary;
1743 unsigned long flags;
1744 u32 msk = 1 << hard_smp_processor_id();
1745 unsigned int i;
1746
1747 BUG_ON(mpic == NULL);
1748
1749 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1750 raw_spin_lock_irqsave(&mpic_lock, flags);
1751
1752 /* let the mpic know we don't want intrs. */
1753 for (i = 0; i < mpic->num_sources ; i++)
1754 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1755 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1756
1757 /* Set current processor priority to max */
1758 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1759 /* We need to EOI the IPI since not all platforms reset the MPIC
1760 * on boot and new interrupts wouldn't get delivered otherwise.
1761 */
1762 mpic_eoi(mpic);
1763
1764 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1765 }
1766
1767
1768 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1769 {
1770 u32 src;
1771
1772 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1773 #ifdef DEBUG_LOW
1774 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1775 #endif
1776 if (unlikely(src == mpic->spurious_vec)) {
1777 if (mpic->flags & MPIC_SPV_EOI)
1778 mpic_eoi(mpic);
1779 return 0;
1780 }
1781 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1782 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1783 mpic->name, (int)src);
1784 mpic_eoi(mpic);
1785 return 0;
1786 }
1787
1788 return irq_linear_revmap(mpic->irqhost, src);
1789 }
1790
1791 unsigned int mpic_get_one_irq(struct mpic *mpic)
1792 {
1793 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1794 }
1795
1796 unsigned int mpic_get_irq(void)
1797 {
1798 struct mpic *mpic = mpic_primary;
1799
1800 BUG_ON(mpic == NULL);
1801
1802 return mpic_get_one_irq(mpic);
1803 }
1804
1805 unsigned int mpic_get_coreint_irq(void)
1806 {
1807 #ifdef CONFIG_BOOKE
1808 struct mpic *mpic = mpic_primary;
1809 u32 src;
1810
1811 BUG_ON(mpic == NULL);
1812
1813 src = mfspr(SPRN_EPR);
1814
1815 if (unlikely(src == mpic->spurious_vec)) {
1816 if (mpic->flags & MPIC_SPV_EOI)
1817 mpic_eoi(mpic);
1818 return 0;
1819 }
1820 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1821 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1822 mpic->name, (int)src);
1823 return 0;
1824 }
1825
1826 return irq_linear_revmap(mpic->irqhost, src);
1827 #else
1828 return 0;
1829 #endif
1830 }
1831
1832 unsigned int mpic_get_mcirq(void)
1833 {
1834 struct mpic *mpic = mpic_primary;
1835
1836 BUG_ON(mpic == NULL);
1837
1838 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1839 }
1840
1841 #ifdef CONFIG_SMP
1842 void __init mpic_request_ipis(void)
1843 {
1844 struct mpic *mpic = mpic_primary;
1845 int i;
1846 BUG_ON(mpic == NULL);
1847
1848 printk(KERN_INFO "mpic: requesting IPIs...\n");
1849
1850 for (i = 0; i < 4; i++) {
1851 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1852 mpic->ipi_vecs[0] + i);
1853 if (!vipi) {
1854 printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1855 continue;
1856 }
1857 smp_request_message_ipi(vipi, i);
1858 }
1859 }
1860
1861 void smp_mpic_message_pass(int cpu, int msg)
1862 {
1863 struct mpic *mpic = mpic_primary;
1864 u32 physmask;
1865
1866 BUG_ON(mpic == NULL);
1867
1868 /* make sure we're sending something that translates to an IPI */
1869 if ((unsigned int)msg > 3) {
1870 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1871 smp_processor_id(), msg);
1872 return;
1873 }
1874
1875 #ifdef DEBUG_IPI
1876 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
1877 #endif
1878
1879 physmask = 1 << get_hard_smp_processor_id(cpu);
1880
1881 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1882 msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
1883 }
1884
1885 void __init smp_mpic_probe(void)
1886 {
1887 int nr_cpus;
1888
1889 DBG("smp_mpic_probe()...\n");
1890
1891 nr_cpus = num_possible_cpus();
1892
1893 DBG("nr_cpus: %d\n", nr_cpus);
1894
1895 if (nr_cpus > 1)
1896 mpic_request_ipis();
1897 }
1898
1899 void smp_mpic_setup_cpu(int cpu)
1900 {
1901 mpic_setup_this_cpu();
1902 }
1903
1904 void mpic_reset_core(int cpu)
1905 {
1906 struct mpic *mpic = mpic_primary;
1907 u32 pir;
1908 int cpuid = get_hard_smp_processor_id(cpu);
1909 int i;
1910
1911 /* Set target bit for core reset */
1912 pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1913 pir |= (1 << cpuid);
1914 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1915 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1916
1917 /* Restore target bit after reset complete */
1918 pir &= ~(1 << cpuid);
1919 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1920 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1921
1922 /* Perform 15 EOI on each reset core to clear pending interrupts.
1923 * This is required for FSL CoreNet based devices */
1924 if (mpic->flags & MPIC_FSL) {
1925 for (i = 0; i < 15; i++) {
1926 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
1927 MPIC_CPU_EOI, 0);
1928 }
1929 }
1930 }
1931 #endif /* CONFIG_SMP */
1932
1933 #ifdef CONFIG_PM
1934 static void mpic_suspend_one(struct mpic *mpic)
1935 {
1936 int i;
1937
1938 for (i = 0; i < mpic->num_sources; i++) {
1939 mpic->save_data[i].vecprio =
1940 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1941 mpic->save_data[i].dest =
1942 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1943 }
1944 }
1945
1946 static int mpic_suspend(void)
1947 {
1948 struct mpic *mpic = mpics;
1949
1950 while (mpic) {
1951 mpic_suspend_one(mpic);
1952 mpic = mpic->next;
1953 }
1954
1955 return 0;
1956 }
1957
1958 static void mpic_resume_one(struct mpic *mpic)
1959 {
1960 int i;
1961
1962 for (i = 0; i < mpic->num_sources; i++) {
1963 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1964 mpic->save_data[i].vecprio);
1965 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1966 mpic->save_data[i].dest);
1967
1968 #ifdef CONFIG_MPIC_U3_HT_IRQS
1969 if (mpic->fixups) {
1970 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1971
1972 if (fixup->base) {
1973 /* we use the lowest bit in an inverted meaning */
1974 if ((mpic->save_data[i].fixup_data & 1) == 0)
1975 continue;
1976
1977 /* Enable and configure */
1978 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1979
1980 writel(mpic->save_data[i].fixup_data & ~1,
1981 fixup->base + 4);
1982 }
1983 }
1984 #endif
1985 } /* end for loop */
1986 }
1987
1988 static void mpic_resume(void)
1989 {
1990 struct mpic *mpic = mpics;
1991
1992 while (mpic) {
1993 mpic_resume_one(mpic);
1994 mpic = mpic->next;
1995 }
1996 }
1997
1998 static struct syscore_ops mpic_syscore_ops = {
1999 .resume = mpic_resume,
2000 .suspend = mpic_suspend,
2001 };
2002
2003 static int mpic_init_sys(void)
2004 {
2005 int rc;
2006
2007 register_syscore_ops(&mpic_syscore_ops);
2008 rc = subsys_system_register(&mpic_subsys, NULL);
2009 if (rc) {
2010 unregister_syscore_ops(&mpic_syscore_ops);
2011 pr_err("mpic: Failed to register subsystem!\n");
2012 return rc;
2013 }
2014
2015 return 0;
2016 }
2017
2018 device_initcall(mpic_init_sys);
2019 #endif
2020
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