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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / arch / powerpc / sysdev / mpic.c
blob4e9ccb1015de45e083dc02dce3088292ee2d3b2e
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 * Copyright 2010-2011 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/bootmem.h>
28 #include <linux/spinlock.h>
29 #include <linux/pci.h>
30 #include <linux/slab.h>
31 #include <linux/syscore_ops.h>
32 #include <linux/ratelimit.h>
33
34 #include <asm/ptrace.h>
35 #include <asm/signal.h>
36 #include <asm/io.h>
37 #include <asm/pgtable.h>
38 #include <asm/irq.h>
39 #include <asm/machdep.h>
40 #include <asm/mpic.h>
41 #include <asm/smp.h>
42
43 #include "mpic.h"
44
45 #ifdef DEBUG
46 #define DBG(fmt...) printk(fmt)
47 #else
48 #define DBG(fmt...)
49 #endif
50
51 static struct mpic *mpics;
52 static struct mpic *mpic_primary;
53 static DEFINE_RAW_SPINLOCK(mpic_lock);
54
55 #ifdef CONFIG_PPC32 /* XXX for now */
56 #ifdef CONFIG_IRQ_ALL_CPUS
57 #define distribute_irqs (1)
58 #else
59 #define distribute_irqs (0)
60 #endif
61 #endif
62
63 #ifdef CONFIG_MPIC_WEIRD
64 static u32 mpic_infos[][MPIC_IDX_END] = {
65 [0] = { /* Original OpenPIC compatible MPIC */
66 MPIC_GREG_BASE,
67 MPIC_GREG_FEATURE_0,
68 MPIC_GREG_GLOBAL_CONF_0,
69 MPIC_GREG_VENDOR_ID,
70 MPIC_GREG_IPI_VECTOR_PRI_0,
71 MPIC_GREG_IPI_STRIDE,
72 MPIC_GREG_SPURIOUS,
73 MPIC_GREG_TIMER_FREQ,
74
75 MPIC_TIMER_BASE,
76 MPIC_TIMER_STRIDE,
77 MPIC_TIMER_CURRENT_CNT,
78 MPIC_TIMER_BASE_CNT,
79 MPIC_TIMER_VECTOR_PRI,
80 MPIC_TIMER_DESTINATION,
81
82 MPIC_CPU_BASE,
83 MPIC_CPU_STRIDE,
84 MPIC_CPU_IPI_DISPATCH_0,
85 MPIC_CPU_IPI_DISPATCH_STRIDE,
86 MPIC_CPU_CURRENT_TASK_PRI,
87 MPIC_CPU_WHOAMI,
88 MPIC_CPU_INTACK,
89 MPIC_CPU_EOI,
90 MPIC_CPU_MCACK,
91
92 MPIC_IRQ_BASE,
93 MPIC_IRQ_STRIDE,
94 MPIC_IRQ_VECTOR_PRI,
95 MPIC_VECPRI_VECTOR_MASK,
96 MPIC_VECPRI_POLARITY_POSITIVE,
97 MPIC_VECPRI_POLARITY_NEGATIVE,
98 MPIC_VECPRI_SENSE_LEVEL,
99 MPIC_VECPRI_SENSE_EDGE,
100 MPIC_VECPRI_POLARITY_MASK,
101 MPIC_VECPRI_SENSE_MASK,
102 MPIC_IRQ_DESTINATION
103 },
104 [1] = { /* Tsi108/109 PIC */
105 TSI108_GREG_BASE,
106 TSI108_GREG_FEATURE_0,
107 TSI108_GREG_GLOBAL_CONF_0,
108 TSI108_GREG_VENDOR_ID,
109 TSI108_GREG_IPI_VECTOR_PRI_0,
110 TSI108_GREG_IPI_STRIDE,
111 TSI108_GREG_SPURIOUS,
112 TSI108_GREG_TIMER_FREQ,
113
114 TSI108_TIMER_BASE,
115 TSI108_TIMER_STRIDE,
116 TSI108_TIMER_CURRENT_CNT,
117 TSI108_TIMER_BASE_CNT,
118 TSI108_TIMER_VECTOR_PRI,
119 TSI108_TIMER_DESTINATION,
120
121 TSI108_CPU_BASE,
122 TSI108_CPU_STRIDE,
123 TSI108_CPU_IPI_DISPATCH_0,
124 TSI108_CPU_IPI_DISPATCH_STRIDE,
125 TSI108_CPU_CURRENT_TASK_PRI,
126 TSI108_CPU_WHOAMI,
127 TSI108_CPU_INTACK,
128 TSI108_CPU_EOI,
129 TSI108_CPU_MCACK,
130
131 TSI108_IRQ_BASE,
132 TSI108_IRQ_STRIDE,
133 TSI108_IRQ_VECTOR_PRI,
134 TSI108_VECPRI_VECTOR_MASK,
135 TSI108_VECPRI_POLARITY_POSITIVE,
136 TSI108_VECPRI_POLARITY_NEGATIVE,
137 TSI108_VECPRI_SENSE_LEVEL,
138 TSI108_VECPRI_SENSE_EDGE,
139 TSI108_VECPRI_POLARITY_MASK,
140 TSI108_VECPRI_SENSE_MASK,
141 TSI108_IRQ_DESTINATION
142 },
143 };
144
145 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
146
147 #else /* CONFIG_MPIC_WEIRD */
148
149 #define MPIC_INFO(name) MPIC_##name
150
151 #endif /* CONFIG_MPIC_WEIRD */
152
153 static inline unsigned int mpic_processor_id(struct mpic *mpic)
154 {
155 unsigned int cpu = 0;
156
157 if (!(mpic->flags & MPIC_SECONDARY))
158 cpu = hard_smp_processor_id();
159
160 return cpu;
161 }
162
163 /*
164 * Register accessor functions
165 */
166
167
168 static inline u32 _mpic_read(enum mpic_reg_type type,
169 struct mpic_reg_bank *rb,
170 unsigned int reg)
171 {
172 switch(type) {
173 #ifdef CONFIG_PPC_DCR
174 case mpic_access_dcr:
175 return dcr_read(rb->dhost, reg);
176 #endif
177 case mpic_access_mmio_be:
178 return in_be32(rb->base + (reg >> 2));
179 case mpic_access_mmio_le:
180 default:
181 return in_le32(rb->base + (reg >> 2));
182 }
183 }
184
185 static inline void _mpic_write(enum mpic_reg_type type,
186 struct mpic_reg_bank *rb,
187 unsigned int reg, u32 value)
188 {
189 switch(type) {
190 #ifdef CONFIG_PPC_DCR
191 case mpic_access_dcr:
192 dcr_write(rb->dhost, reg, value);
193 break;
194 #endif
195 case mpic_access_mmio_be:
196 out_be32(rb->base + (reg >> 2), value);
197 break;
198 case mpic_access_mmio_le:
199 default:
200 out_le32(rb->base + (reg >> 2), value);
201 break;
202 }
203 }
204
205 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
206 {
207 enum mpic_reg_type type = mpic->reg_type;
208 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
209 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
210
211 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
212 type = mpic_access_mmio_be;
213 return _mpic_read(type, &mpic->gregs, offset);
214 }
215
216 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
217 {
218 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
219 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
220
221 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
222 }
223
224 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
225 {
226 unsigned int offset = MPIC_INFO(TIMER_VECTOR_PRI) +
227 ((tm & 3) * MPIC_INFO(TIMER_STRIDE));
228
229 if (tm >= 4)
230 offset += 0x1000 / 4;
231
232 return _mpic_read(mpic->reg_type, &mpic->tmregs, offset);
233 }
234
235 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value)
236 {
237 unsigned int offset = MPIC_INFO(TIMER_VECTOR_PRI) +
238 ((tm & 3) * MPIC_INFO(TIMER_STRIDE));
239
240 if (tm >= 4)
241 offset += 0x1000 / 4;
242
243 _mpic_write(mpic->reg_type, &mpic->tmregs, offset, value);
244 }
245
246 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
247 {
248 unsigned int cpu = mpic_processor_id(mpic);
249
250 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
251 }
252
253 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
254 {
255 unsigned int cpu = mpic_processor_id(mpic);
256
257 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
258 }
259
260 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
261 {
262 unsigned int isu = src_no >> mpic->isu_shift;
263 unsigned int idx = src_no & mpic->isu_mask;
264 unsigned int val;
265
266 val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
267 reg + (idx * MPIC_INFO(IRQ_STRIDE)));
268 #ifdef CONFIG_MPIC_BROKEN_REGREAD
269 if (reg == 0)
270 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
271 mpic->isu_reg0_shadow[src_no];
272 #endif
273 return val;
274 }
275
276 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
277 unsigned int reg, u32 value)
278 {
279 unsigned int isu = src_no >> mpic->isu_shift;
280 unsigned int idx = src_no & mpic->isu_mask;
281
282 _mpic_write(mpic->reg_type, &mpic->isus[isu],
283 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
284
285 #ifdef CONFIG_MPIC_BROKEN_REGREAD
286 if (reg == 0)
287 mpic->isu_reg0_shadow[src_no] =
288 value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
289 #endif
290 }
291
292 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r))
293 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v))
294 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
295 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
296 #define mpic_tm_read(i) _mpic_tm_read(mpic,(i))
297 #define mpic_tm_write(i,v) _mpic_tm_write(mpic,(i),(v))
298 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
299 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
300 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
301 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
302
303
304 /*
305 * Low level utility functions
306 */
307
308
309 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
310 struct mpic_reg_bank *rb, unsigned int offset,
311 unsigned int size)
312 {
313 rb->base = ioremap(phys_addr + offset, size);
314 BUG_ON(rb->base == NULL);
315 }
316
317 #ifdef CONFIG_PPC_DCR
318 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
319 unsigned int offset, unsigned int size)
320 {
321 phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0);
322 rb->dhost = dcr_map(mpic->node, phys_addr + offset, size);
323 BUG_ON(!DCR_MAP_OK(rb->dhost));
324 }
325
326 static inline void mpic_map(struct mpic *mpic,
327 phys_addr_t phys_addr, struct mpic_reg_bank *rb,
328 unsigned int offset, unsigned int size)
329 {
330 if (mpic->flags & MPIC_USES_DCR)
331 _mpic_map_dcr(mpic, rb, offset, size);
332 else
333 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
334 }
335 #else /* CONFIG_PPC_DCR */
336 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
337 #endif /* !CONFIG_PPC_DCR */
338
339
340
341 /* Check if we have one of those nice broken MPICs with a flipped endian on
342 * reads from IPI registers
343 */
344 static void __init mpic_test_broken_ipi(struct mpic *mpic)
345 {
346 u32 r;
347
348 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
349 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
350
351 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
352 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
353 mpic->flags |= MPIC_BROKEN_IPI;
354 }
355 }
356
357 #ifdef CONFIG_MPIC_U3_HT_IRQS
358
359 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
360 * to force the edge setting on the MPIC and do the ack workaround.
361 */
362 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
363 {
364 if (source >= 128 || !mpic->fixups)
365 return 0;
366 return mpic->fixups[source].base != NULL;
367 }
368
369
370 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
371 {
372 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
373
374 if (fixup->applebase) {
375 unsigned int soff = (fixup->index >> 3) & ~3;
376 unsigned int mask = 1U << (fixup->index & 0x1f);
377 writel(mask, fixup->applebase + soff);
378 } else {
379 raw_spin_lock(&mpic->fixup_lock);
380 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
381 writel(fixup->data, fixup->base + 4);
382 raw_spin_unlock(&mpic->fixup_lock);
383 }
384 }
385
386 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
387 bool level)
388 {
389 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
390 unsigned long flags;
391 u32 tmp;
392
393 if (fixup->base == NULL)
394 return;
395
396 DBG("startup_ht_interrupt(0x%x) index: %d\n",
397 source, fixup->index);
398 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
399 /* Enable and configure */
400 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
401 tmp = readl(fixup->base + 4);
402 tmp &= ~(0x23U);
403 if (level)
404 tmp |= 0x22;
405 writel(tmp, fixup->base + 4);
406 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
407
408 #ifdef CONFIG_PM
409 /* use the lowest bit inverted to the actual HW,
410 * set if this fixup was enabled, clear otherwise */
411 mpic->save_data[source].fixup_data = tmp | 1;
412 #endif
413 }
414
415 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
416 {
417 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
418 unsigned long flags;
419 u32 tmp;
420
421 if (fixup->base == NULL)
422 return;
423
424 DBG("shutdown_ht_interrupt(0x%x)\n", source);
425
426 /* Disable */
427 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
428 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
429 tmp = readl(fixup->base + 4);
430 tmp |= 1;
431 writel(tmp, fixup->base + 4);
432 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
433
434 #ifdef CONFIG_PM
435 /* use the lowest bit inverted to the actual HW,
436 * set if this fixup was enabled, clear otherwise */
437 mpic->save_data[source].fixup_data = tmp & ~1;
438 #endif
439 }
440
441 #ifdef CONFIG_PCI_MSI
442 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
443 unsigned int devfn)
444 {
445 u8 __iomem *base;
446 u8 pos, flags;
447 u64 addr = 0;
448
449 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
450 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
451 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
452 if (id == PCI_CAP_ID_HT) {
453 id = readb(devbase + pos + 3);
454 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
455 break;
456 }
457 }
458
459 if (pos == 0)
460 return;
461
462 base = devbase + pos;
463
464 flags = readb(base + HT_MSI_FLAGS);
465 if (!(flags & HT_MSI_FLAGS_FIXED)) {
466 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
467 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
468 }
469
470 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
471 PCI_SLOT(devfn), PCI_FUNC(devfn),
472 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
473
474 if (!(flags & HT_MSI_FLAGS_ENABLE))
475 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
476 }
477 #else
478 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
479 unsigned int devfn)
480 {
481 return;
482 }
483 #endif
484
485 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
486 unsigned int devfn, u32 vdid)
487 {
488 int i, irq, n;
489 u8 __iomem *base;
490 u32 tmp;
491 u8 pos;
492
493 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
494 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
495 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
496 if (id == PCI_CAP_ID_HT) {
497 id = readb(devbase + pos + 3);
498 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
499 break;
500 }
501 }
502 if (pos == 0)
503 return;
504
505 base = devbase + pos;
506 writeb(0x01, base + 2);
507 n = (readl(base + 4) >> 16) & 0xff;
508
509 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
510 " has %d irqs\n",
511 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
512
513 for (i = 0; i <= n; i++) {
514 writeb(0x10 + 2 * i, base + 2);
515 tmp = readl(base + 4);
516 irq = (tmp >> 16) & 0xff;
517 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
518 /* mask it , will be unmasked later */
519 tmp |= 0x1;
520 writel(tmp, base + 4);
521 mpic->fixups[irq].index = i;
522 mpic->fixups[irq].base = base;
523 /* Apple HT PIC has a non-standard way of doing EOIs */
524 if ((vdid & 0xffff) == 0x106b)
525 mpic->fixups[irq].applebase = devbase + 0x60;
526 else
527 mpic->fixups[irq].applebase = NULL;
528 writeb(0x11 + 2 * i, base + 2);
529 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
530 }
531 }
532
533
534 static void __init mpic_scan_ht_pics(struct mpic *mpic)
535 {
536 unsigned int devfn;
537 u8 __iomem *cfgspace;
538
539 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
540
541 /* Allocate fixups array */
542 mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
543 BUG_ON(mpic->fixups == NULL);
544
545 /* Init spinlock */
546 raw_spin_lock_init(&mpic->fixup_lock);
547
548 /* Map U3 config space. We assume all IO-APICs are on the primary bus
549 * so we only need to map 64kB.
550 */
551 cfgspace = ioremap(0xf2000000, 0x10000);
552 BUG_ON(cfgspace == NULL);
553
554 /* Now we scan all slots. We do a very quick scan, we read the header
555 * type, vendor ID and device ID only, that's plenty enough
556 */
557 for (devfn = 0; devfn < 0x100; devfn++) {
558 u8 __iomem *devbase = cfgspace + (devfn << 8);
559 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
560 u32 l = readl(devbase + PCI_VENDOR_ID);
561 u16 s;
562
563 DBG("devfn %x, l: %x\n", devfn, l);
564
565 /* If no device, skip */
566 if (l == 0xffffffff || l == 0x00000000 ||
567 l == 0x0000ffff || l == 0xffff0000)
568 goto next;
569 /* Check if is supports capability lists */
570 s = readw(devbase + PCI_STATUS);
571 if (!(s & PCI_STATUS_CAP_LIST))
572 goto next;
573
574 mpic_scan_ht_pic(mpic, devbase, devfn, l);
575 mpic_scan_ht_msi(mpic, devbase, devfn);
576
577 next:
578 /* next device, if function 0 */
579 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
580 devfn += 7;
581 }
582 }
583
584 #else /* CONFIG_MPIC_U3_HT_IRQS */
585
586 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
587 {
588 return 0;
589 }
590
591 static void __init mpic_scan_ht_pics(struct mpic *mpic)
592 {
593 }
594
595 #endif /* CONFIG_MPIC_U3_HT_IRQS */
596
597 /* Find an mpic associated with a given linux interrupt */
598 static struct mpic *mpic_find(unsigned int irq)
599 {
600 if (irq < NUM_ISA_INTERRUPTS)
601 return NULL;
602
603 return irq_get_chip_data(irq);
604 }
605
606 /* Determine if the linux irq is an IPI */
607 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int irq)
608 {
609 unsigned int src = virq_to_hw(irq);
610
611 return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
612 }
613
614 /* Determine if the linux irq is a timer */
615 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int irq)
616 {
617 unsigned int src = virq_to_hw(irq);
618
619 return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]);
620 }
621
622 /* Convert a cpu mask from logical to physical cpu numbers. */
623 static inline u32 mpic_physmask(u32 cpumask)
624 {
625 int i;
626 u32 mask = 0;
627
628 for (i = 0; i < min(32, NR_CPUS); ++i, cpumask >>= 1)
629 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
630 return mask;
631 }
632
633 #ifdef CONFIG_SMP
634 /* Get the mpic structure from the IPI number */
635 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
636 {
637 return irq_data_get_irq_chip_data(d);
638 }
639 #endif
640
641 /* Get the mpic structure from the irq number */
642 static inline struct mpic * mpic_from_irq(unsigned int irq)
643 {
644 return irq_get_chip_data(irq);
645 }
646
647 /* Get the mpic structure from the irq data */
648 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
649 {
650 return irq_data_get_irq_chip_data(d);
651 }
652
653 /* Send an EOI */
654 static inline void mpic_eoi(struct mpic *mpic)
655 {
656 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
657 (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
658 }
659
660 /*
661 * Linux descriptor level callbacks
662 */
663
664
665 void mpic_unmask_irq(struct irq_data *d)
666 {
667 unsigned int loops = 100000;
668 struct mpic *mpic = mpic_from_irq_data(d);
669 unsigned int src = irqd_to_hwirq(d);
670
671 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
672
673 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
674 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
675 ~MPIC_VECPRI_MASK);
676 /* make sure mask gets to controller before we return to user */
677 do {
678 if (!loops--) {
679 printk(KERN_ERR "%s: timeout on hwirq %u\n",
680 __func__, src);
681 break;
682 }
683 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
684 }
685
686 void mpic_mask_irq(struct irq_data *d)
687 {
688 unsigned int loops = 100000;
689 struct mpic *mpic = mpic_from_irq_data(d);
690 unsigned int src = irqd_to_hwirq(d);
691
692 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
693
694 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
695 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
696 MPIC_VECPRI_MASK);
697
698 /* make sure mask gets to controller before we return to user */
699 do {
700 if (!loops--) {
701 printk(KERN_ERR "%s: timeout on hwirq %u\n",
702 __func__, src);
703 break;
704 }
705 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
706 }
707
708 void mpic_end_irq(struct irq_data *d)
709 {
710 struct mpic *mpic = mpic_from_irq_data(d);
711
712 #ifdef DEBUG_IRQ
713 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
714 #endif
715 /* We always EOI on end_irq() even for edge interrupts since that
716 * should only lower the priority, the MPIC should have properly
717 * latched another edge interrupt coming in anyway
718 */
719
720 mpic_eoi(mpic);
721 }
722
723 #ifdef CONFIG_MPIC_U3_HT_IRQS
724
725 static void mpic_unmask_ht_irq(struct irq_data *d)
726 {
727 struct mpic *mpic = mpic_from_irq_data(d);
728 unsigned int src = irqd_to_hwirq(d);
729
730 mpic_unmask_irq(d);
731
732 if (irqd_is_level_type(d))
733 mpic_ht_end_irq(mpic, src);
734 }
735
736 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
737 {
738 struct mpic *mpic = mpic_from_irq_data(d);
739 unsigned int src = irqd_to_hwirq(d);
740
741 mpic_unmask_irq(d);
742 mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
743
744 return 0;
745 }
746
747 static void mpic_shutdown_ht_irq(struct irq_data *d)
748 {
749 struct mpic *mpic = mpic_from_irq_data(d);
750 unsigned int src = irqd_to_hwirq(d);
751
752 mpic_shutdown_ht_interrupt(mpic, src);
753 mpic_mask_irq(d);
754 }
755
756 static void mpic_end_ht_irq(struct irq_data *d)
757 {
758 struct mpic *mpic = mpic_from_irq_data(d);
759 unsigned int src = irqd_to_hwirq(d);
760
761 #ifdef DEBUG_IRQ
762 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
763 #endif
764 /* We always EOI on end_irq() even for edge interrupts since that
765 * should only lower the priority, the MPIC should have properly
766 * latched another edge interrupt coming in anyway
767 */
768
769 if (irqd_is_level_type(d))
770 mpic_ht_end_irq(mpic, src);
771 mpic_eoi(mpic);
772 }
773 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
774
775 #ifdef CONFIG_SMP
776
777 static void mpic_unmask_ipi(struct irq_data *d)
778 {
779 struct mpic *mpic = mpic_from_ipi(d);
780 unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0];
781
782 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
783 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
784 }
785
786 static void mpic_mask_ipi(struct irq_data *d)
787 {
788 /* NEVER disable an IPI... that's just plain wrong! */
789 }
790
791 static void mpic_end_ipi(struct irq_data *d)
792 {
793 struct mpic *mpic = mpic_from_ipi(d);
794
795 /*
796 * IPIs are marked IRQ_PER_CPU. This has the side effect of
797 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
798 * applying to them. We EOI them late to avoid re-entering.
799 */
800 mpic_eoi(mpic);
801 }
802
803 #endif /* CONFIG_SMP */
804
805 static void mpic_unmask_tm(struct irq_data *d)
806 {
807 struct mpic *mpic = mpic_from_irq_data(d);
808 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
809
810 DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src);
811 mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK);
812 mpic_tm_read(src);
813 }
814
815 static void mpic_mask_tm(struct irq_data *d)
816 {
817 struct mpic *mpic = mpic_from_irq_data(d);
818 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
819
820 mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK);
821 mpic_tm_read(src);
822 }
823
824 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
825 bool force)
826 {
827 struct mpic *mpic = mpic_from_irq_data(d);
828 unsigned int src = irqd_to_hwirq(d);
829
830 if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
831 int cpuid = irq_choose_cpu(cpumask);
832
833 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
834 } else {
835 u32 mask = cpumask_bits(cpumask)[0];
836
837 mask &= cpumask_bits(cpu_online_mask)[0];
838
839 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
840 mpic_physmask(mask));
841 }
842
843 return 0;
844 }
845
846 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
847 {
848 /* Now convert sense value */
849 switch(type & IRQ_TYPE_SENSE_MASK) {
850 case IRQ_TYPE_EDGE_RISING:
851 return MPIC_INFO(VECPRI_SENSE_EDGE) |
852 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
853 case IRQ_TYPE_EDGE_FALLING:
854 case IRQ_TYPE_EDGE_BOTH:
855 return MPIC_INFO(VECPRI_SENSE_EDGE) |
856 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
857 case IRQ_TYPE_LEVEL_HIGH:
858 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
859 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
860 case IRQ_TYPE_LEVEL_LOW:
861 default:
862 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
863 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
864 }
865 }
866
867 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
868 {
869 struct mpic *mpic = mpic_from_irq_data(d);
870 unsigned int src = irqd_to_hwirq(d);
871 unsigned int vecpri, vold, vnew;
872
873 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
874 mpic, d->irq, src, flow_type);
875
876 if (src >= mpic->irq_count)
877 return -EINVAL;
878
879 if (flow_type == IRQ_TYPE_NONE)
880 if (mpic->senses && src < mpic->senses_count)
881 flow_type = mpic->senses[src];
882 if (flow_type == IRQ_TYPE_NONE)
883 flow_type = IRQ_TYPE_LEVEL_LOW;
884
885 irqd_set_trigger_type(d, flow_type);
886
887 if (mpic_is_ht_interrupt(mpic, src))
888 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
889 MPIC_VECPRI_SENSE_EDGE;
890 else
891 vecpri = mpic_type_to_vecpri(mpic, flow_type);
892
893 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
894 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
895 MPIC_INFO(VECPRI_SENSE_MASK));
896 vnew |= vecpri;
897 if (vold != vnew)
898 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
899
900 return IRQ_SET_MASK_OK_NOCOPY;
901 }
902
903 void mpic_set_vector(unsigned int virq, unsigned int vector)
904 {
905 struct mpic *mpic = mpic_from_irq(virq);
906 unsigned int src = virq_to_hw(virq);
907 unsigned int vecpri;
908
909 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
910 mpic, virq, src, vector);
911
912 if (src >= mpic->irq_count)
913 return;
914
915 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
916 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
917 vecpri |= vector;
918 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
919 }
920
921 void mpic_set_destination(unsigned int virq, unsigned int cpuid)
922 {
923 struct mpic *mpic = mpic_from_irq(virq);
924 unsigned int src = virq_to_hw(virq);
925
926 DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
927 mpic, virq, src, cpuid);
928
929 if (src >= mpic->irq_count)
930 return;
931
932 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
933 }
934
935 static struct irq_chip mpic_irq_chip = {
936 .irq_mask = mpic_mask_irq,
937 .irq_unmask = mpic_unmask_irq,
938 .irq_eoi = mpic_end_irq,
939 .irq_set_type = mpic_set_irq_type,
940 };
941
942 #ifdef CONFIG_SMP
943 static struct irq_chip mpic_ipi_chip = {
944 .irq_mask = mpic_mask_ipi,
945 .irq_unmask = mpic_unmask_ipi,
946 .irq_eoi = mpic_end_ipi,
947 };
948 #endif /* CONFIG_SMP */
949
950 static struct irq_chip mpic_tm_chip = {
951 .irq_mask = mpic_mask_tm,
952 .irq_unmask = mpic_unmask_tm,
953 .irq_eoi = mpic_end_irq,
954 };
955
956 #ifdef CONFIG_MPIC_U3_HT_IRQS
957 static struct irq_chip mpic_irq_ht_chip = {
958 .irq_startup = mpic_startup_ht_irq,
959 .irq_shutdown = mpic_shutdown_ht_irq,
960 .irq_mask = mpic_mask_irq,
961 .irq_unmask = mpic_unmask_ht_irq,
962 .irq_eoi = mpic_end_ht_irq,
963 .irq_set_type = mpic_set_irq_type,
964 };
965 #endif /* CONFIG_MPIC_U3_HT_IRQS */
966
967
968 static int mpic_host_match(struct irq_host *h, struct device_node *node)
969 {
970 /* Exact match, unless mpic node is NULL */
971 return h->of_node == NULL || h->of_node == node;
972 }
973
974 static int mpic_host_map(struct irq_host *h, unsigned int virq,
975 irq_hw_number_t hw)
976 {
977 struct mpic *mpic = h->host_data;
978 struct irq_chip *chip;
979
980 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
981
982 if (hw == mpic->spurious_vec)
983 return -EINVAL;
984 if (mpic->protected && test_bit(hw, mpic->protected))
985 return -EINVAL;
986
987 #ifdef CONFIG_SMP
988 else if (hw >= mpic->ipi_vecs[0]) {
989 WARN_ON(mpic->flags & MPIC_SECONDARY);
990
991 DBG("mpic: mapping as IPI\n");
992 irq_set_chip_data(virq, mpic);
993 irq_set_chip_and_handler(virq, &mpic->hc_ipi,
994 handle_percpu_irq);
995 return 0;
996 }
997 #endif /* CONFIG_SMP */
998
999 if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
1000 WARN_ON(mpic->flags & MPIC_SECONDARY);
1001
1002 DBG("mpic: mapping as timer\n");
1003 irq_set_chip_data(virq, mpic);
1004 irq_set_chip_and_handler(virq, &mpic->hc_tm,
1005 handle_fasteoi_irq);
1006 return 0;
1007 }
1008
1009 if (hw >= mpic->irq_count)
1010 return -EINVAL;
1011
1012 mpic_msi_reserve_hwirq(mpic, hw);
1013
1014 /* Default chip */
1015 chip = &mpic->hc_irq;
1016
1017 #ifdef CONFIG_MPIC_U3_HT_IRQS
1018 /* Check for HT interrupts, override vecpri */
1019 if (mpic_is_ht_interrupt(mpic, hw))
1020 chip = &mpic->hc_ht_irq;
1021 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1022
1023 DBG("mpic: mapping to irq chip @%p\n", chip);
1024
1025 irq_set_chip_data(virq, mpic);
1026 irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1027
1028 /* Set default irq type */
1029 irq_set_irq_type(virq, IRQ_TYPE_NONE);
1030
1031 /* If the MPIC was reset, then all vectors have already been
1032 * initialized. Otherwise, a per source lazy initialization
1033 * is done here.
1034 */
1035 if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1036 mpic_set_vector(virq, hw);
1037 mpic_set_destination(virq, mpic_processor_id(mpic));
1038 mpic_irq_set_priority(virq, 8);
1039 }
1040
1041 return 0;
1042 }
1043
1044 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
1045 const u32 *intspec, unsigned int intsize,
1046 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1047
1048 {
1049 struct mpic *mpic = h->host_data;
1050 static unsigned char map_mpic_senses[4] = {
1051 IRQ_TYPE_EDGE_RISING,
1052 IRQ_TYPE_LEVEL_LOW,
1053 IRQ_TYPE_LEVEL_HIGH,
1054 IRQ_TYPE_EDGE_FALLING,
1055 };
1056
1057 *out_hwirq = intspec[0];
1058 if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
1059 /*
1060 * Freescale MPIC with extended intspec:
1061 * First two cells are as usual. Third specifies
1062 * an "interrupt type". Fourth is type-specific data.
1063 *
1064 * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
1065 */
1066 switch (intspec[2]) {
1067 case 0:
1068 case 1: /* no EISR/EIMR support for now, treat as shared IRQ */
1069 break;
1070 case 2:
1071 if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
1072 return -EINVAL;
1073
1074 *out_hwirq = mpic->ipi_vecs[intspec[0]];
1075 break;
1076 case 3:
1077 if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
1078 return -EINVAL;
1079
1080 *out_hwirq = mpic->timer_vecs[intspec[0]];
1081 break;
1082 default:
1083 pr_debug("%s: unknown irq type %u\n",
1084 __func__, intspec[2]);
1085 return -EINVAL;
1086 }
1087
1088 *out_flags = map_mpic_senses[intspec[1] & 3];
1089 } else if (intsize > 1) {
1090 u32 mask = 0x3;
1091
1092 /* Apple invented a new race of encoding on machines with
1093 * an HT APIC. They encode, among others, the index within
1094 * the HT APIC. We don't care about it here since thankfully,
1095 * it appears that they have the APIC already properly
1096 * configured, and thus our current fixup code that reads the
1097 * APIC config works fine. However, we still need to mask out
1098 * bits in the specifier to make sure we only get bit 0 which
1099 * is the level/edge bit (the only sense bit exposed by Apple),
1100 * as their bit 1 means something else.
1101 */
1102 if (machine_is(powermac))
1103 mask = 0x1;
1104 *out_flags = map_mpic_senses[intspec[1] & mask];
1105 } else
1106 *out_flags = IRQ_TYPE_NONE;
1107
1108 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1109 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1110
1111 return 0;
1112 }
1113
1114 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
1115 static void mpic_cascade(unsigned int irq, struct irq_desc *desc)
1116 {
1117 struct irq_chip *chip = irq_desc_get_chip(desc);
1118 struct mpic *mpic = irq_desc_get_handler_data(desc);
1119 unsigned int virq;
1120
1121 BUG_ON(!(mpic->flags & MPIC_SECONDARY));
1122
1123 virq = mpic_get_one_irq(mpic);
1124 if (virq != NO_IRQ)
1125 generic_handle_irq(virq);
1126
1127 chip->irq_eoi(&desc->irq_data);
1128 }
1129
1130 static struct irq_host_ops mpic_host_ops = {
1131 .match = mpic_host_match,
1132 .map = mpic_host_map,
1133 .xlate = mpic_host_xlate,
1134 };
1135
1136 /*
1137 * Exported functions
1138 */
1139
1140 struct mpic * __init mpic_alloc(struct device_node *node,
1141 phys_addr_t phys_addr,
1142 unsigned int flags,
1143 unsigned int isu_size,
1144 unsigned int irq_count,
1145 const char *name)
1146 {
1147 int i, psize, intvec_top;
1148 struct mpic *mpic;
1149 u32 greg_feature;
1150 const char *vers;
1151 const u32 *psrc;
1152
1153 /* Default MPIC search parameters */
1154 static const struct of_device_id __initconst mpic_device_id[] = {
1155 { .type = "open-pic", },
1156 { .compatible = "open-pic", },
1157 {},
1158 };
1159
1160 /*
1161 * If we were not passed a device-tree node, then perform the default
1162 * search for standardized a standardized OpenPIC.
1163 */
1164 if (node) {
1165 node = of_node_get(node);
1166 } else {
1167 node = of_find_matching_node(NULL, mpic_device_id);
1168 if (!node)
1169 return NULL;
1170 }
1171
1172 /* Pick the physical address from the device tree if unspecified */
1173 if (!phys_addr) {
1174 /* Check if it is DCR-based */
1175 if (of_get_property(node, "dcr-reg", NULL)) {
1176 flags |= MPIC_USES_DCR;
1177 } else {
1178 struct resource r;
1179 if (of_address_to_resource(node, 0, &r))
1180 goto err_of_node_put;
1181 phys_addr = r.start;
1182 }
1183 }
1184
1185 mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1186 if (mpic == NULL)
1187 goto err_of_node_put;
1188
1189 mpic->name = name;
1190 mpic->node = node;
1191 mpic->paddr = phys_addr;
1192
1193 mpic->hc_irq = mpic_irq_chip;
1194 mpic->hc_irq.name = name;
1195 if (!(flags & MPIC_SECONDARY))
1196 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1197 #ifdef CONFIG_MPIC_U3_HT_IRQS
1198 mpic->hc_ht_irq = mpic_irq_ht_chip;
1199 mpic->hc_ht_irq.name = name;
1200 if (!(flags & MPIC_SECONDARY))
1201 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1202 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1203
1204 #ifdef CONFIG_SMP
1205 mpic->hc_ipi = mpic_ipi_chip;
1206 mpic->hc_ipi.name = name;
1207 #endif /* CONFIG_SMP */
1208
1209 mpic->hc_tm = mpic_tm_chip;
1210 mpic->hc_tm.name = name;
1211
1212 mpic->flags = flags;
1213 mpic->isu_size = isu_size;
1214 mpic->irq_count = irq_count;
1215 mpic->num_sources = 0; /* so far */
1216
1217 if (flags & MPIC_LARGE_VECTORS)
1218 intvec_top = 2047;
1219 else
1220 intvec_top = 255;
1221
1222 mpic->timer_vecs[0] = intvec_top - 12;
1223 mpic->timer_vecs[1] = intvec_top - 11;
1224 mpic->timer_vecs[2] = intvec_top - 10;
1225 mpic->timer_vecs[3] = intvec_top - 9;
1226 mpic->timer_vecs[4] = intvec_top - 8;
1227 mpic->timer_vecs[5] = intvec_top - 7;
1228 mpic->timer_vecs[6] = intvec_top - 6;
1229 mpic->timer_vecs[7] = intvec_top - 5;
1230 mpic->ipi_vecs[0] = intvec_top - 4;
1231 mpic->ipi_vecs[1] = intvec_top - 3;
1232 mpic->ipi_vecs[2] = intvec_top - 2;
1233 mpic->ipi_vecs[3] = intvec_top - 1;
1234 mpic->spurious_vec = intvec_top;
1235
1236 /* Check for "big-endian" in device-tree */
1237 if (of_get_property(mpic->node, "big-endian", NULL) != NULL)
1238 mpic->flags |= MPIC_BIG_ENDIAN;
1239 if (of_device_is_compatible(mpic->node, "fsl,mpic"))
1240 mpic->flags |= MPIC_FSL;
1241
1242 /* Look for protected sources */
1243 psrc = of_get_property(mpic->node, "protected-sources", &psize);
1244 if (psrc) {
1245 /* Allocate a bitmap with one bit per interrupt */
1246 unsigned int mapsize = BITS_TO_LONGS(intvec_top + 1);
1247 mpic->protected = kzalloc(mapsize*sizeof(long), GFP_KERNEL);
1248 BUG_ON(mpic->protected == NULL);
1249 for (i = 0; i < psize/sizeof(u32); i++) {
1250 if (psrc[i] > intvec_top)
1251 continue;
1252 __set_bit(psrc[i], mpic->protected);
1253 }
1254 }
1255
1256 #ifdef CONFIG_MPIC_WEIRD
1257 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1258 #endif
1259
1260 /* default register type */
1261 if (flags & MPIC_BIG_ENDIAN)
1262 mpic->reg_type = mpic_access_mmio_be;
1263 else
1264 mpic->reg_type = mpic_access_mmio_le;
1265
1266 /*
1267 * An MPIC with a "dcr-reg" property must be accessed that way, but
1268 * only if the kernel includes DCR support.
1269 */
1270 #ifdef CONFIG_PPC_DCR
1271 if (flags & MPIC_USES_DCR)
1272 mpic->reg_type = mpic_access_dcr;
1273 #else
1274 BUG_ON(flags & MPIC_USES_DCR);
1275 #endif
1276
1277 /* Map the global registers */
1278 mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1279 mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1280
1281 /* Reset */
1282
1283 /* When using a device-node, reset requests are only honored if the MPIC
1284 * is allowed to reset.
1285 */
1286 if (of_get_property(mpic->node, "pic-no-reset", NULL))
1287 mpic->flags |= MPIC_NO_RESET;
1288
1289 if ((flags & MPIC_WANTS_RESET) && !(mpic->flags & MPIC_NO_RESET)) {
1290 printk(KERN_DEBUG "mpic: Resetting\n");
1291 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1292 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1293 | MPIC_GREG_GCONF_RESET);
1294 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1295 & MPIC_GREG_GCONF_RESET)
1296 mb();
1297 }
1298
1299 /* CoreInt */
1300 if (flags & MPIC_ENABLE_COREINT)
1301 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1302 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1303 | MPIC_GREG_GCONF_COREINT);
1304
1305 if (flags & MPIC_ENABLE_MCK)
1306 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1307 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1308 | MPIC_GREG_GCONF_MCK);
1309
1310 /*
1311 * Read feature register. For non-ISU MPICs, num sources as well. On
1312 * ISU MPICs, sources are counted as ISUs are added
1313 */
1314 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1315 if (isu_size == 0) {
1316 if (flags & MPIC_BROKEN_FRR_NIRQS)
1317 mpic->num_sources = mpic->irq_count;
1318 else
1319 mpic->num_sources =
1320 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1321 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1322 }
1323
1324 /*
1325 * The MPIC driver will crash if there are more cores than we
1326 * can initialize, so we may as well catch that problem here.
1327 */
1328 BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
1329
1330 /* Map the per-CPU registers */
1331 for_each_possible_cpu(i) {
1332 unsigned int cpu = get_hard_smp_processor_id(i);
1333
1334 mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
1335 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
1336 0x1000);
1337 }
1338
1339 /* Initialize main ISU if none provided */
1340 if (mpic->isu_size == 0) {
1341 mpic->isu_size = mpic->num_sources;
1342 mpic_map(mpic, mpic->paddr, &mpic->isus[0],
1343 MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1344 }
1345 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1346 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1347
1348 mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
1349 isu_size ? isu_size : mpic->num_sources,
1350 &mpic_host_ops,
1351 flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1352
1353 /*
1354 * FIXME: The code leaks the MPIC object and mappings here; this
1355 * is very unlikely to fail but it ought to be fixed anyways.
1356 */
1357 if (mpic->irqhost == NULL)
1358 return NULL;
1359
1360 mpic->irqhost->host_data = mpic;
1361
1362 /* Display version */
1363 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1364 case 1:
1365 vers = "1.0";
1366 break;
1367 case 2:
1368 vers = "1.2";
1369 break;
1370 case 3:
1371 vers = "1.3";
1372 break;
1373 default:
1374 vers = "<unknown>";
1375 break;
1376 }
1377 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1378 " max %d CPUs\n",
1379 name, vers, (unsigned long long)mpic->paddr, num_possible_cpus());
1380 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1381 mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1382
1383 mpic->next = mpics;
1384 mpics = mpic;
1385
1386 if (!(flags & MPIC_SECONDARY)) {
1387 mpic_primary = mpic;
1388 irq_set_default_host(mpic->irqhost);
1389 }
1390
1391 return mpic;
1392
1393 err_of_node_put:
1394 of_node_put(node);
1395 return NULL;
1396 }
1397
1398 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1399 phys_addr_t paddr)
1400 {
1401 unsigned int isu_first = isu_num * mpic->isu_size;
1402
1403 BUG_ON(isu_num >= MPIC_MAX_ISU);
1404
1405 mpic_map(mpic,
1406 paddr, &mpic->isus[isu_num], 0,
1407 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1408
1409 if ((isu_first + mpic->isu_size) > mpic->num_sources)
1410 mpic->num_sources = isu_first + mpic->isu_size;
1411 }
1412
1413 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1414 {
1415 mpic->senses = senses;
1416 mpic->senses_count = count;
1417 }
1418
1419 void __init mpic_init(struct mpic *mpic)
1420 {
1421 int i, cpu;
1422
1423 BUG_ON(mpic->num_sources == 0);
1424
1425 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1426
1427 /* Set current processor priority to max */
1428 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1429
1430 /* Initialize timers to our reserved vectors and mask them for now */
1431 for (i = 0; i < 4; i++) {
1432 mpic_write(mpic->tmregs,
1433 i * MPIC_INFO(TIMER_STRIDE) +
1434 MPIC_INFO(TIMER_DESTINATION),
1435 1 << hard_smp_processor_id());
1436 mpic_write(mpic->tmregs,
1437 i * MPIC_INFO(TIMER_STRIDE) +
1438 MPIC_INFO(TIMER_VECTOR_PRI),
1439 MPIC_VECPRI_MASK |
1440 (9 << MPIC_VECPRI_PRIORITY_SHIFT) |
1441 (mpic->timer_vecs[0] + i));
1442 }
1443
1444 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1445 mpic_test_broken_ipi(mpic);
1446 for (i = 0; i < 4; i++) {
1447 mpic_ipi_write(i,
1448 MPIC_VECPRI_MASK |
1449 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1450 (mpic->ipi_vecs[0] + i));
1451 }
1452
1453 /* Initialize interrupt sources */
1454 if (mpic->irq_count == 0)
1455 mpic->irq_count = mpic->num_sources;
1456
1457 /* Do the HT PIC fixups on U3 broken mpic */
1458 DBG("MPIC flags: %x\n", mpic->flags);
1459 if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
1460 mpic_scan_ht_pics(mpic);
1461 mpic_u3msi_init(mpic);
1462 }
1463
1464 mpic_pasemi_msi_init(mpic);
1465
1466 cpu = mpic_processor_id(mpic);
1467
1468 if (!(mpic->flags & MPIC_NO_RESET)) {
1469 for (i = 0; i < mpic->num_sources; i++) {
1470 /* start with vector = source number, and masked */
1471 u32 vecpri = MPIC_VECPRI_MASK | i |
1472 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1473
1474 /* check if protected */
1475 if (mpic->protected && test_bit(i, mpic->protected))
1476 continue;
1477 /* init hw */
1478 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1479 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1480 }
1481 }
1482
1483 /* Init spurious vector */
1484 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1485
1486 /* Disable 8259 passthrough, if supported */
1487 if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1488 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1489 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1490 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1491
1492 if (mpic->flags & MPIC_NO_BIAS)
1493 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1494 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1495 | MPIC_GREG_GCONF_NO_BIAS);
1496
1497 /* Set current processor priority to 0 */
1498 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1499
1500 #ifdef CONFIG_PM
1501 /* allocate memory to save mpic state */
1502 mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1503 GFP_KERNEL);
1504 BUG_ON(mpic->save_data == NULL);
1505 #endif
1506
1507 /* Check if this MPIC is chained from a parent interrupt controller */
1508 if (mpic->flags & MPIC_SECONDARY) {
1509 int virq = irq_of_parse_and_map(mpic->node, 0);
1510 if (virq != NO_IRQ) {
1511 printk(KERN_INFO "%s: hooking up to IRQ %d\n",
1512 mpic->node->full_name, virq);
1513 irq_set_handler_data(virq, mpic);
1514 irq_set_chained_handler(virq, &mpic_cascade);
1515 }
1516 }
1517 }
1518
1519 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1520 {
1521 u32 v;
1522
1523 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1524 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1525 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1526 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1527 }
1528
1529 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1530 {
1531 unsigned long flags;
1532 u32 v;
1533
1534 raw_spin_lock_irqsave(&mpic_lock, flags);
1535 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1536 if (enable)
1537 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1538 else
1539 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1540 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1541 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1542 }
1543
1544 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1545 {
1546 struct mpic *mpic = mpic_find(irq);
1547 unsigned int src = virq_to_hw(irq);
1548 unsigned long flags;
1549 u32 reg;
1550
1551 if (!mpic)
1552 return;
1553
1554 raw_spin_lock_irqsave(&mpic_lock, flags);
1555 if (mpic_is_ipi(mpic, irq)) {
1556 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1557 ~MPIC_VECPRI_PRIORITY_MASK;
1558 mpic_ipi_write(src - mpic->ipi_vecs[0],
1559 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1560 } else if (mpic_is_tm(mpic, irq)) {
1561 reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
1562 ~MPIC_VECPRI_PRIORITY_MASK;
1563 mpic_tm_write(src - mpic->timer_vecs[0],
1564 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1565 } else {
1566 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1567 & ~MPIC_VECPRI_PRIORITY_MASK;
1568 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1569 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1570 }
1571 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1572 }
1573
1574 void mpic_setup_this_cpu(void)
1575 {
1576 #ifdef CONFIG_SMP
1577 struct mpic *mpic = mpic_primary;
1578 unsigned long flags;
1579 u32 msk = 1 << hard_smp_processor_id();
1580 unsigned int i;
1581
1582 BUG_ON(mpic == NULL);
1583
1584 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1585
1586 raw_spin_lock_irqsave(&mpic_lock, flags);
1587
1588 /* let the mpic know we want intrs. default affinity is 0xffffffff
1589 * until changed via /proc. That's how it's done on x86. If we want
1590 * it differently, then we should make sure we also change the default
1591 * values of irq_desc[].affinity in irq.c.
1592 */
1593 if (distribute_irqs) {
1594 for (i = 0; i < mpic->num_sources ; i++)
1595 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1596 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1597 }
1598
1599 /* Set current processor priority to 0 */
1600 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1601
1602 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1603 #endif /* CONFIG_SMP */
1604 }
1605
1606 int mpic_cpu_get_priority(void)
1607 {
1608 struct mpic *mpic = mpic_primary;
1609
1610 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1611 }
1612
1613 void mpic_cpu_set_priority(int prio)
1614 {
1615 struct mpic *mpic = mpic_primary;
1616
1617 prio &= MPIC_CPU_TASKPRI_MASK;
1618 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1619 }
1620
1621 void mpic_teardown_this_cpu(int secondary)
1622 {
1623 struct mpic *mpic = mpic_primary;
1624 unsigned long flags;
1625 u32 msk = 1 << hard_smp_processor_id();
1626 unsigned int i;
1627
1628 BUG_ON(mpic == NULL);
1629
1630 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1631 raw_spin_lock_irqsave(&mpic_lock, flags);
1632
1633 /* let the mpic know we don't want intrs. */
1634 for (i = 0; i < mpic->num_sources ; i++)
1635 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1636 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1637
1638 /* Set current processor priority to max */
1639 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1640 /* We need to EOI the IPI since not all platforms reset the MPIC
1641 * on boot and new interrupts wouldn't get delivered otherwise.
1642 */
1643 mpic_eoi(mpic);
1644
1645 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1646 }
1647
1648
1649 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1650 {
1651 u32 src;
1652
1653 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1654 #ifdef DEBUG_LOW
1655 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1656 #endif
1657 if (unlikely(src == mpic->spurious_vec)) {
1658 if (mpic->flags & MPIC_SPV_EOI)
1659 mpic_eoi(mpic);
1660 return NO_IRQ;
1661 }
1662 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1663 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1664 mpic->name, (int)src);
1665 mpic_eoi(mpic);
1666 return NO_IRQ;
1667 }
1668
1669 return irq_linear_revmap(mpic->irqhost, src);
1670 }
1671
1672 unsigned int mpic_get_one_irq(struct mpic *mpic)
1673 {
1674 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1675 }
1676
1677 unsigned int mpic_get_irq(void)
1678 {
1679 struct mpic *mpic = mpic_primary;
1680
1681 BUG_ON(mpic == NULL);
1682
1683 return mpic_get_one_irq(mpic);
1684 }
1685
1686 unsigned int mpic_get_coreint_irq(void)
1687 {
1688 #ifdef CONFIG_BOOKE
1689 struct mpic *mpic = mpic_primary;
1690 u32 src;
1691
1692 BUG_ON(mpic == NULL);
1693
1694 src = mfspr(SPRN_EPR);
1695
1696 if (unlikely(src == mpic->spurious_vec)) {
1697 if (mpic->flags & MPIC_SPV_EOI)
1698 mpic_eoi(mpic);
1699 return NO_IRQ;
1700 }
1701 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1702 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1703 mpic->name, (int)src);
1704 return NO_IRQ;
1705 }
1706
1707 return irq_linear_revmap(mpic->irqhost, src);
1708 #else
1709 return NO_IRQ;
1710 #endif
1711 }
1712
1713 unsigned int mpic_get_mcirq(void)
1714 {
1715 struct mpic *mpic = mpic_primary;
1716
1717 BUG_ON(mpic == NULL);
1718
1719 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1720 }
1721
1722 #ifdef CONFIG_SMP
1723 void mpic_request_ipis(void)
1724 {
1725 struct mpic *mpic = mpic_primary;
1726 int i;
1727 BUG_ON(mpic == NULL);
1728
1729 printk(KERN_INFO "mpic: requesting IPIs...\n");
1730
1731 for (i = 0; i < 4; i++) {
1732 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1733 mpic->ipi_vecs[0] + i);
1734 if (vipi == NO_IRQ) {
1735 printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1736 continue;
1737 }
1738 smp_request_message_ipi(vipi, i);
1739 }
1740 }
1741
1742 void smp_mpic_message_pass(int cpu, int msg)
1743 {
1744 struct mpic *mpic = mpic_primary;
1745 u32 physmask;
1746
1747 BUG_ON(mpic == NULL);
1748
1749 /* make sure we're sending something that translates to an IPI */
1750 if ((unsigned int)msg > 3) {
1751 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1752 smp_processor_id(), msg);
1753 return;
1754 }
1755
1756 #ifdef DEBUG_IPI
1757 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
1758 #endif
1759
1760 physmask = 1 << get_hard_smp_processor_id(cpu);
1761
1762 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1763 msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
1764 }
1765
1766 int __init smp_mpic_probe(void)
1767 {
1768 int nr_cpus;
1769
1770 DBG("smp_mpic_probe()...\n");
1771
1772 nr_cpus = cpumask_weight(cpu_possible_mask);
1773
1774 DBG("nr_cpus: %d\n", nr_cpus);
1775
1776 if (nr_cpus > 1)
1777 mpic_request_ipis();
1778
1779 return nr_cpus;
1780 }
1781
1782 void __devinit smp_mpic_setup_cpu(int cpu)
1783 {
1784 mpic_setup_this_cpu();
1785 }
1786
1787 void mpic_reset_core(int cpu)
1788 {
1789 struct mpic *mpic = mpic_primary;
1790 u32 pir;
1791 int cpuid = get_hard_smp_processor_id(cpu);
1792 int i;
1793
1794 /* Set target bit for core reset */
1795 pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1796 pir |= (1 << cpuid);
1797 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1798 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1799
1800 /* Restore target bit after reset complete */
1801 pir &= ~(1 << cpuid);
1802 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1803 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1804
1805 /* Perform 15 EOI on each reset core to clear pending interrupts.
1806 * This is required for FSL CoreNet based devices */
1807 if (mpic->flags & MPIC_FSL) {
1808 for (i = 0; i < 15; i++) {
1809 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
1810 MPIC_CPU_EOI, 0);
1811 }
1812 }
1813 }
1814 #endif /* CONFIG_SMP */
1815
1816 #ifdef CONFIG_PM
1817 static void mpic_suspend_one(struct mpic *mpic)
1818 {
1819 int i;
1820
1821 for (i = 0; i < mpic->num_sources; i++) {
1822 mpic->save_data[i].vecprio =
1823 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1824 mpic->save_data[i].dest =
1825 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1826 }
1827 }
1828
1829 static int mpic_suspend(void)
1830 {
1831 struct mpic *mpic = mpics;
1832
1833 while (mpic) {
1834 mpic_suspend_one(mpic);
1835 mpic = mpic->next;
1836 }
1837
1838 return 0;
1839 }
1840
1841 static void mpic_resume_one(struct mpic *mpic)
1842 {
1843 int i;
1844
1845 for (i = 0; i < mpic->num_sources; i++) {
1846 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1847 mpic->save_data[i].vecprio);
1848 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1849 mpic->save_data[i].dest);
1850
1851 #ifdef CONFIG_MPIC_U3_HT_IRQS
1852 if (mpic->fixups) {
1853 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1854
1855 if (fixup->base) {
1856 /* we use the lowest bit in an inverted meaning */
1857 if ((mpic->save_data[i].fixup_data & 1) == 0)
1858 continue;
1859
1860 /* Enable and configure */
1861 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1862
1863 writel(mpic->save_data[i].fixup_data & ~1,
1864 fixup->base + 4);
1865 }
1866 }
1867 #endif
1868 } /* end for loop */
1869 }
1870
1871 static void mpic_resume(void)
1872 {
1873 struct mpic *mpic = mpics;
1874
1875 while (mpic) {
1876 mpic_resume_one(mpic);
1877 mpic = mpic->next;
1878 }
1879 }
1880
1881 static struct syscore_ops mpic_syscore_ops = {
1882 .resume = mpic_resume,
1883 .suspend = mpic_suspend,
1884 };
1885
1886 static int mpic_init_sys(void)
1887 {
1888 register_syscore_ops(&mpic_syscore_ops);
1889 return 0;
1890 }
1891
1892 device_initcall(mpic_init_sys);
1893 #endif