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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 2010-2012 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 
33 #include <asm/ptrace.h>
34 #include <asm/signal.h>
35 #include <asm/io.h>
36 #include <asm/pgtable.h>
37 #include <asm/irq.h>
38 #include <asm/machdep.h>
39 #include <asm/mpic.h>
40 #include <asm/smp.h>
41 
42 #include "mpic.h"
43 
44 #ifdef DEBUG
45 #define DBG(fmt...) printk(fmt)
46 #else
47 #define DBG(fmt...)
48 #endif
49 
50 struct bus_type mpic_subsys = {
51 	.name = "mpic",
52 	.dev_name = "mpic",
53 };
54 EXPORT_SYMBOL_GPL(mpic_subsys);
55 
56 static struct mpic *mpics;
57 static struct mpic *mpic_primary;
58 static DEFINE_RAW_SPINLOCK(mpic_lock);
59 
60 #ifdef CONFIG_PPC32	/* XXX for now */
61 #ifdef CONFIG_IRQ_ALL_CPUS
62 #define distribute_irqs	(1)
63 #else
64 #define distribute_irqs	(0)
65 #endif
66 #endif
67 
68 #ifdef CONFIG_MPIC_WEIRD
69 static u32 mpic_infos[][MPIC_IDX_END] = {
70 	[0] = {	/* Original OpenPIC compatible MPIC */
71 		MPIC_GREG_BASE,
72 		MPIC_GREG_FEATURE_0,
73 		MPIC_GREG_GLOBAL_CONF_0,
74 		MPIC_GREG_VENDOR_ID,
75 		MPIC_GREG_IPI_VECTOR_PRI_0,
76 		MPIC_GREG_IPI_STRIDE,
77 		MPIC_GREG_SPURIOUS,
78 		MPIC_GREG_TIMER_FREQ,
79 
80 		MPIC_TIMER_BASE,
81 		MPIC_TIMER_STRIDE,
82 		MPIC_TIMER_CURRENT_CNT,
83 		MPIC_TIMER_BASE_CNT,
84 		MPIC_TIMER_VECTOR_PRI,
85 		MPIC_TIMER_DESTINATION,
86 
87 		MPIC_CPU_BASE,
88 		MPIC_CPU_STRIDE,
89 		MPIC_CPU_IPI_DISPATCH_0,
90 		MPIC_CPU_IPI_DISPATCH_STRIDE,
91 		MPIC_CPU_CURRENT_TASK_PRI,
92 		MPIC_CPU_WHOAMI,
93 		MPIC_CPU_INTACK,
94 		MPIC_CPU_EOI,
95 		MPIC_CPU_MCACK,
96 
97 		MPIC_IRQ_BASE,
98 		MPIC_IRQ_STRIDE,
99 		MPIC_IRQ_VECTOR_PRI,
100 		MPIC_VECPRI_VECTOR_MASK,
101 		MPIC_VECPRI_POLARITY_POSITIVE,
102 		MPIC_VECPRI_POLARITY_NEGATIVE,
103 		MPIC_VECPRI_SENSE_LEVEL,
104 		MPIC_VECPRI_SENSE_EDGE,
105 		MPIC_VECPRI_POLARITY_MASK,
106 		MPIC_VECPRI_SENSE_MASK,
107 		MPIC_IRQ_DESTINATION
108 	},
109 	[1] = {	/* Tsi108/109 PIC */
110 		TSI108_GREG_BASE,
111 		TSI108_GREG_FEATURE_0,
112 		TSI108_GREG_GLOBAL_CONF_0,
113 		TSI108_GREG_VENDOR_ID,
114 		TSI108_GREG_IPI_VECTOR_PRI_0,
115 		TSI108_GREG_IPI_STRIDE,
116 		TSI108_GREG_SPURIOUS,
117 		TSI108_GREG_TIMER_FREQ,
118 
119 		TSI108_TIMER_BASE,
120 		TSI108_TIMER_STRIDE,
121 		TSI108_TIMER_CURRENT_CNT,
122 		TSI108_TIMER_BASE_CNT,
123 		TSI108_TIMER_VECTOR_PRI,
124 		TSI108_TIMER_DESTINATION,
125 
126 		TSI108_CPU_BASE,
127 		TSI108_CPU_STRIDE,
128 		TSI108_CPU_IPI_DISPATCH_0,
129 		TSI108_CPU_IPI_DISPATCH_STRIDE,
130 		TSI108_CPU_CURRENT_TASK_PRI,
131 		TSI108_CPU_WHOAMI,
132 		TSI108_CPU_INTACK,
133 		TSI108_CPU_EOI,
134 		TSI108_CPU_MCACK,
135 
136 		TSI108_IRQ_BASE,
137 		TSI108_IRQ_STRIDE,
138 		TSI108_IRQ_VECTOR_PRI,
139 		TSI108_VECPRI_VECTOR_MASK,
140 		TSI108_VECPRI_POLARITY_POSITIVE,
141 		TSI108_VECPRI_POLARITY_NEGATIVE,
142 		TSI108_VECPRI_SENSE_LEVEL,
143 		TSI108_VECPRI_SENSE_EDGE,
144 		TSI108_VECPRI_POLARITY_MASK,
145 		TSI108_VECPRI_SENSE_MASK,
146 		TSI108_IRQ_DESTINATION
147 	},
148 };
149 
150 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
151 
152 #else /* CONFIG_MPIC_WEIRD */
153 
154 #define MPIC_INFO(name) MPIC_##name
155 
156 #endif /* CONFIG_MPIC_WEIRD */
157 
mpic_processor_id(struct mpic * mpic)158 static inline unsigned int mpic_processor_id(struct mpic *mpic)
159 {
160 	unsigned int cpu = 0;
161 
162 	if (!(mpic->flags & MPIC_SECONDARY))
163 		cpu = hard_smp_processor_id();
164 
165 	return cpu;
166 }
167 
168 /*
169  * Register accessor functions
170  */
171 
172 
_mpic_read(enum mpic_reg_type type,struct mpic_reg_bank * rb,unsigned int reg)173 static inline u32 _mpic_read(enum mpic_reg_type type,
174 			     struct mpic_reg_bank *rb,
175 			     unsigned int reg)
176 {
177 	switch(type) {
178 #ifdef CONFIG_PPC_DCR
179 	case mpic_access_dcr:
180 		return dcr_read(rb->dhost, reg);
181 #endif
182 	case mpic_access_mmio_be:
183 		return in_be32(rb->base + (reg >> 2));
184 	case mpic_access_mmio_le:
185 	default:
186 		return in_le32(rb->base + (reg >> 2));
187 	}
188 }
189 
_mpic_write(enum mpic_reg_type type,struct mpic_reg_bank * rb,unsigned int reg,u32 value)190 static inline void _mpic_write(enum mpic_reg_type type,
191 			       struct mpic_reg_bank *rb,
192  			       unsigned int reg, u32 value)
193 {
194 	switch(type) {
195 #ifdef CONFIG_PPC_DCR
196 	case mpic_access_dcr:
197 		dcr_write(rb->dhost, reg, value);
198 		break;
199 #endif
200 	case mpic_access_mmio_be:
201 		out_be32(rb->base + (reg >> 2), value);
202 		break;
203 	case mpic_access_mmio_le:
204 	default:
205 		out_le32(rb->base + (reg >> 2), value);
206 		break;
207 	}
208 }
209 
_mpic_ipi_read(struct mpic * mpic,unsigned int ipi)210 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
211 {
212 	enum mpic_reg_type type = mpic->reg_type;
213 	unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
214 			      (ipi * MPIC_INFO(GREG_IPI_STRIDE));
215 
216 	if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
217 		type = mpic_access_mmio_be;
218 	return _mpic_read(type, &mpic->gregs, offset);
219 }
220 
_mpic_ipi_write(struct mpic * mpic,unsigned int ipi,u32 value)221 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
222 {
223 	unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
224 			      (ipi * MPIC_INFO(GREG_IPI_STRIDE));
225 
226 	_mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
227 }
228 
mpic_tm_offset(struct mpic * mpic,unsigned int tm)229 static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm)
230 {
231 	return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE +
232 	       (tm & 3) * MPIC_INFO(TIMER_STRIDE);
233 }
234 
_mpic_tm_read(struct mpic * mpic,unsigned int tm)235 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
236 {
237 	unsigned int offset = mpic_tm_offset(mpic, tm) +
238 			      MPIC_INFO(TIMER_VECTOR_PRI);
239 
240 	return _mpic_read(mpic->reg_type, &mpic->tmregs, offset);
241 }
242 
_mpic_tm_write(struct mpic * mpic,unsigned int tm,u32 value)243 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value)
244 {
245 	unsigned int offset = mpic_tm_offset(mpic, tm) +
246 			      MPIC_INFO(TIMER_VECTOR_PRI);
247 
248 	_mpic_write(mpic->reg_type, &mpic->tmregs, offset, value);
249 }
250 
_mpic_cpu_read(struct mpic * mpic,unsigned int reg)251 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
252 {
253 	unsigned int cpu = mpic_processor_id(mpic);
254 
255 	return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
256 }
257 
_mpic_cpu_write(struct mpic * mpic,unsigned int reg,u32 value)258 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
259 {
260 	unsigned int cpu = mpic_processor_id(mpic);
261 
262 	_mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
263 }
264 
_mpic_irq_read(struct mpic * mpic,unsigned int src_no,unsigned int reg)265 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
266 {
267 	unsigned int	isu = src_no >> mpic->isu_shift;
268 	unsigned int	idx = src_no & mpic->isu_mask;
269 	unsigned int	val;
270 
271 	val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
272 			 reg + (idx * MPIC_INFO(IRQ_STRIDE)));
273 #ifdef CONFIG_MPIC_BROKEN_REGREAD
274 	if (reg == 0)
275 		val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
276 			mpic->isu_reg0_shadow[src_no];
277 #endif
278 	return val;
279 }
280 
_mpic_irq_write(struct mpic * mpic,unsigned int src_no,unsigned int reg,u32 value)281 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
282 				   unsigned int reg, u32 value)
283 {
284 	unsigned int	isu = src_no >> mpic->isu_shift;
285 	unsigned int	idx = src_no & mpic->isu_mask;
286 
287 	_mpic_write(mpic->reg_type, &mpic->isus[isu],
288 		    reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
289 
290 #ifdef CONFIG_MPIC_BROKEN_REGREAD
291 	if (reg == 0)
292 		mpic->isu_reg0_shadow[src_no] =
293 			value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
294 #endif
295 }
296 
297 #define mpic_read(b,r)		_mpic_read(mpic->reg_type,&(b),(r))
298 #define mpic_write(b,r,v)	_mpic_write(mpic->reg_type,&(b),(r),(v))
299 #define mpic_ipi_read(i)	_mpic_ipi_read(mpic,(i))
300 #define mpic_ipi_write(i,v)	_mpic_ipi_write(mpic,(i),(v))
301 #define mpic_tm_read(i)		_mpic_tm_read(mpic,(i))
302 #define mpic_tm_write(i,v)	_mpic_tm_write(mpic,(i),(v))
303 #define mpic_cpu_read(i)	_mpic_cpu_read(mpic,(i))
304 #define mpic_cpu_write(i,v)	_mpic_cpu_write(mpic,(i),(v))
305 #define mpic_irq_read(s,r)	_mpic_irq_read(mpic,(s),(r))
306 #define mpic_irq_write(s,r,v)	_mpic_irq_write(mpic,(s),(r),(v))
307 
308 
309 /*
310  * Low level utility functions
311  */
312 
313 
_mpic_map_mmio(struct mpic * mpic,phys_addr_t phys_addr,struct mpic_reg_bank * rb,unsigned int offset,unsigned int size)314 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
315 			   struct mpic_reg_bank *rb, unsigned int offset,
316 			   unsigned int size)
317 {
318 	rb->base = ioremap(phys_addr + offset, size);
319 	BUG_ON(rb->base == NULL);
320 }
321 
322 #ifdef CONFIG_PPC_DCR
_mpic_map_dcr(struct mpic * mpic,struct mpic_reg_bank * rb,unsigned int offset,unsigned int size)323 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
324 			  unsigned int offset, unsigned int size)
325 {
326 	phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0);
327 	rb->dhost = dcr_map(mpic->node, phys_addr + offset, size);
328 	BUG_ON(!DCR_MAP_OK(rb->dhost));
329 }
330 
mpic_map(struct mpic * mpic,phys_addr_t phys_addr,struct mpic_reg_bank * rb,unsigned int offset,unsigned int size)331 static inline void mpic_map(struct mpic *mpic,
332 			    phys_addr_t phys_addr, struct mpic_reg_bank *rb,
333 			    unsigned int offset, unsigned int size)
334 {
335 	if (mpic->flags & MPIC_USES_DCR)
336 		_mpic_map_dcr(mpic, rb, offset, size);
337 	else
338 		_mpic_map_mmio(mpic, phys_addr, rb, offset, size);
339 }
340 #else /* CONFIG_PPC_DCR */
341 #define mpic_map(m,p,b,o,s)	_mpic_map_mmio(m,p,b,o,s)
342 #endif /* !CONFIG_PPC_DCR */
343 
344 
345 
346 /* Check if we have one of those nice broken MPICs with a flipped endian on
347  * reads from IPI registers
348  */
mpic_test_broken_ipi(struct mpic * mpic)349 static void __init mpic_test_broken_ipi(struct mpic *mpic)
350 {
351 	u32 r;
352 
353 	mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
354 	r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
355 
356 	if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
357 		printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
358 		mpic->flags |= MPIC_BROKEN_IPI;
359 	}
360 }
361 
362 #ifdef CONFIG_MPIC_U3_HT_IRQS
363 
364 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
365  * to force the edge setting on the MPIC and do the ack workaround.
366  */
mpic_is_ht_interrupt(struct mpic * mpic,unsigned int source)367 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
368 {
369 	if (source >= 128 || !mpic->fixups)
370 		return 0;
371 	return mpic->fixups[source].base != NULL;
372 }
373 
374 
mpic_ht_end_irq(struct mpic * mpic,unsigned int source)375 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
376 {
377 	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
378 
379 	if (fixup->applebase) {
380 		unsigned int soff = (fixup->index >> 3) & ~3;
381 		unsigned int mask = 1U << (fixup->index & 0x1f);
382 		writel(mask, fixup->applebase + soff);
383 	} else {
384 		raw_spin_lock(&mpic->fixup_lock);
385 		writeb(0x11 + 2 * fixup->index, fixup->base + 2);
386 		writel(fixup->data, fixup->base + 4);
387 		raw_spin_unlock(&mpic->fixup_lock);
388 	}
389 }
390 
mpic_startup_ht_interrupt(struct mpic * mpic,unsigned int source,bool level)391 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
392 				      bool level)
393 {
394 	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
395 	unsigned long flags;
396 	u32 tmp;
397 
398 	if (fixup->base == NULL)
399 		return;
400 
401 	DBG("startup_ht_interrupt(0x%x) index: %d\n",
402 	    source, fixup->index);
403 	raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
404 	/* Enable and configure */
405 	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
406 	tmp = readl(fixup->base + 4);
407 	tmp &= ~(0x23U);
408 	if (level)
409 		tmp |= 0x22;
410 	writel(tmp, fixup->base + 4);
411 	raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
412 
413 #ifdef CONFIG_PM
414 	/* use the lowest bit inverted to the actual HW,
415 	 * set if this fixup was enabled, clear otherwise */
416 	mpic->save_data[source].fixup_data = tmp | 1;
417 #endif
418 }
419 
mpic_shutdown_ht_interrupt(struct mpic * mpic,unsigned int source)420 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
421 {
422 	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
423 	unsigned long flags;
424 	u32 tmp;
425 
426 	if (fixup->base == NULL)
427 		return;
428 
429 	DBG("shutdown_ht_interrupt(0x%x)\n", source);
430 
431 	/* Disable */
432 	raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
433 	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
434 	tmp = readl(fixup->base + 4);
435 	tmp |= 1;
436 	writel(tmp, fixup->base + 4);
437 	raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
438 
439 #ifdef CONFIG_PM
440 	/* use the lowest bit inverted to the actual HW,
441 	 * set if this fixup was enabled, clear otherwise */
442 	mpic->save_data[source].fixup_data = tmp & ~1;
443 #endif
444 }
445 
446 #ifdef CONFIG_PCI_MSI
mpic_scan_ht_msi(struct mpic * mpic,u8 __iomem * devbase,unsigned int devfn)447 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
448 				    unsigned int devfn)
449 {
450 	u8 __iomem *base;
451 	u8 pos, flags;
452 	u64 addr = 0;
453 
454 	for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
455 	     pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
456 		u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
457 		if (id == PCI_CAP_ID_HT) {
458 			id = readb(devbase + pos + 3);
459 			if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
460 				break;
461 		}
462 	}
463 
464 	if (pos == 0)
465 		return;
466 
467 	base = devbase + pos;
468 
469 	flags = readb(base + HT_MSI_FLAGS);
470 	if (!(flags & HT_MSI_FLAGS_FIXED)) {
471 		addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
472 		addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
473 	}
474 
475 	printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
476 		PCI_SLOT(devfn), PCI_FUNC(devfn),
477 		flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
478 
479 	if (!(flags & HT_MSI_FLAGS_ENABLE))
480 		writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
481 }
482 #else
mpic_scan_ht_msi(struct mpic * mpic,u8 __iomem * devbase,unsigned int devfn)483 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
484 				    unsigned int devfn)
485 {
486 	return;
487 }
488 #endif
489 
mpic_scan_ht_pic(struct mpic * mpic,u8 __iomem * devbase,unsigned int devfn,u32 vdid)490 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
491 				    unsigned int devfn, u32 vdid)
492 {
493 	int i, irq, n;
494 	u8 __iomem *base;
495 	u32 tmp;
496 	u8 pos;
497 
498 	for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
499 	     pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
500 		u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
501 		if (id == PCI_CAP_ID_HT) {
502 			id = readb(devbase + pos + 3);
503 			if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
504 				break;
505 		}
506 	}
507 	if (pos == 0)
508 		return;
509 
510 	base = devbase + pos;
511 	writeb(0x01, base + 2);
512 	n = (readl(base + 4) >> 16) & 0xff;
513 
514 	printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
515 	       " has %d irqs\n",
516 	       devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
517 
518 	for (i = 0; i <= n; i++) {
519 		writeb(0x10 + 2 * i, base + 2);
520 		tmp = readl(base + 4);
521 		irq = (tmp >> 16) & 0xff;
522 		DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
523 		/* mask it , will be unmasked later */
524 		tmp |= 0x1;
525 		writel(tmp, base + 4);
526 		mpic->fixups[irq].index = i;
527 		mpic->fixups[irq].base = base;
528 		/* Apple HT PIC has a non-standard way of doing EOIs */
529 		if ((vdid & 0xffff) == 0x106b)
530 			mpic->fixups[irq].applebase = devbase + 0x60;
531 		else
532 			mpic->fixups[irq].applebase = NULL;
533 		writeb(0x11 + 2 * i, base + 2);
534 		mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
535 	}
536 }
537 
538 
mpic_scan_ht_pics(struct mpic * mpic)539 static void __init mpic_scan_ht_pics(struct mpic *mpic)
540 {
541 	unsigned int devfn;
542 	u8 __iomem *cfgspace;
543 
544 	printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
545 
546 	/* Allocate fixups array */
547 	mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
548 	BUG_ON(mpic->fixups == NULL);
549 
550 	/* Init spinlock */
551 	raw_spin_lock_init(&mpic->fixup_lock);
552 
553 	/* Map U3 config space. We assume all IO-APICs are on the primary bus
554 	 * so we only need to map 64kB.
555 	 */
556 	cfgspace = ioremap(0xf2000000, 0x10000);
557 	BUG_ON(cfgspace == NULL);
558 
559 	/* Now we scan all slots. We do a very quick scan, we read the header
560 	 * type, vendor ID and device ID only, that's plenty enough
561 	 */
562 	for (devfn = 0; devfn < 0x100; devfn++) {
563 		u8 __iomem *devbase = cfgspace + (devfn << 8);
564 		u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
565 		u32 l = readl(devbase + PCI_VENDOR_ID);
566 		u16 s;
567 
568 		DBG("devfn %x, l: %x\n", devfn, l);
569 
570 		/* If no device, skip */
571 		if (l == 0xffffffff || l == 0x00000000 ||
572 		    l == 0x0000ffff || l == 0xffff0000)
573 			goto next;
574 		/* Check if is supports capability lists */
575 		s = readw(devbase + PCI_STATUS);
576 		if (!(s & PCI_STATUS_CAP_LIST))
577 			goto next;
578 
579 		mpic_scan_ht_pic(mpic, devbase, devfn, l);
580 		mpic_scan_ht_msi(mpic, devbase, devfn);
581 
582 	next:
583 		/* next device, if function 0 */
584 		if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
585 			devfn += 7;
586 	}
587 }
588 
589 #else /* CONFIG_MPIC_U3_HT_IRQS */
590 
mpic_is_ht_interrupt(struct mpic * mpic,unsigned int source)591 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
592 {
593 	return 0;
594 }
595 
mpic_scan_ht_pics(struct mpic * mpic)596 static void __init mpic_scan_ht_pics(struct mpic *mpic)
597 {
598 }
599 
600 #endif /* CONFIG_MPIC_U3_HT_IRQS */
601 
602 /* Find an mpic associated with a given linux interrupt */
mpic_find(unsigned int irq)603 static struct mpic *mpic_find(unsigned int irq)
604 {
605 	if (irq < NUM_ISA_INTERRUPTS)
606 		return NULL;
607 
608 	return irq_get_chip_data(irq);
609 }
610 
611 /* Determine if the linux irq is an IPI */
mpic_is_ipi(struct mpic * mpic,unsigned int src)612 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src)
613 {
614 	return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
615 }
616 
617 /* Determine if the linux irq is a timer */
mpic_is_tm(struct mpic * mpic,unsigned int src)618 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src)
619 {
620 	return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]);
621 }
622 
623 /* Convert a cpu mask from logical to physical cpu numbers. */
mpic_physmask(u32 cpumask)624 static inline u32 mpic_physmask(u32 cpumask)
625 {
626 	int i;
627 	u32 mask = 0;
628 
629 	for (i = 0; i < min(32, NR_CPUS) && cpu_possible(i); ++i, cpumask >>= 1)
630 		mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
631 	return mask;
632 }
633 
634 #ifdef CONFIG_SMP
635 /* Get the mpic structure from the IPI number */
mpic_from_ipi(struct irq_data * d)636 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
637 {
638 	return irq_data_get_irq_chip_data(d);
639 }
640 #endif
641 
642 /* Get the mpic structure from the irq number */
mpic_from_irq(unsigned int irq)643 static inline struct mpic * mpic_from_irq(unsigned int irq)
644 {
645 	return irq_get_chip_data(irq);
646 }
647 
648 /* Get the mpic structure from the irq data */
mpic_from_irq_data(struct irq_data * d)649 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
650 {
651 	return irq_data_get_irq_chip_data(d);
652 }
653 
654 /* Send an EOI */
mpic_eoi(struct mpic * mpic)655 static inline void mpic_eoi(struct mpic *mpic)
656 {
657 	mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
658 }
659 
660 /*
661  * Linux descriptor level callbacks
662  */
663 
664 
mpic_unmask_irq(struct irq_data * d)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 
mpic_mask_irq(struct irq_data * d)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 
mpic_end_irq(struct irq_data * d)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 
mpic_unmask_ht_irq(struct irq_data * d)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 
mpic_startup_ht_irq(struct irq_data * d)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 
mpic_shutdown_ht_irq(struct irq_data * d)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 
mpic_end_ht_irq(struct irq_data * d)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 
mpic_unmask_ipi(struct irq_data * d)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 
mpic_mask_ipi(struct irq_data * d)786 static void mpic_mask_ipi(struct irq_data *d)
787 {
788 	/* NEVER disable an IPI... that's just plain wrong! */
789 }
790 
mpic_end_ipi(struct irq_data * d)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 
mpic_unmask_tm(struct irq_data * d)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 
mpic_mask_tm(struct irq_data * d)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 
mpic_set_affinity(struct irq_data * d,const struct cpumask * cpumask,bool force)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 IRQ_SET_MASK_OK;
844 }
845 
mpic_type_to_vecpri(struct mpic * mpic,unsigned int type)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 
mpic_set_irq_type(struct irq_data * d,unsigned int flow_type)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->num_sources)
877 		return -EINVAL;
878 
879 	vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
880 
881 	/* We don't support "none" type */
882 	if (flow_type == IRQ_TYPE_NONE)
883 		flow_type = IRQ_TYPE_DEFAULT;
884 
885 	/* Default: read HW settings */
886 	if (flow_type == IRQ_TYPE_DEFAULT) {
887 		int vold_ps;
888 
889 		vold_ps = vold & (MPIC_INFO(VECPRI_POLARITY_MASK) |
890 				  MPIC_INFO(VECPRI_SENSE_MASK));
891 
892 		if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) |
893 				MPIC_INFO(VECPRI_POLARITY_POSITIVE)))
894 			flow_type = IRQ_TYPE_EDGE_RISING;
895 		else if	(vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) |
896 				     MPIC_INFO(VECPRI_POLARITY_NEGATIVE)))
897 			flow_type = IRQ_TYPE_EDGE_FALLING;
898 		else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) |
899 				     MPIC_INFO(VECPRI_POLARITY_POSITIVE)))
900 			flow_type = IRQ_TYPE_LEVEL_HIGH;
901 		else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) |
902 				     MPIC_INFO(VECPRI_POLARITY_NEGATIVE)))
903 			flow_type = IRQ_TYPE_LEVEL_LOW;
904 		else
905 			WARN_ONCE(1, "mpic: unknown IRQ type %d\n", vold);
906 	}
907 
908 	/* Apply to irq desc */
909 	irqd_set_trigger_type(d, flow_type);
910 
911 	/* Apply to HW */
912 	if (mpic_is_ht_interrupt(mpic, src))
913 		vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
914 			MPIC_VECPRI_SENSE_EDGE;
915 	else
916 		vecpri = mpic_type_to_vecpri(mpic, flow_type);
917 
918 	vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
919 			MPIC_INFO(VECPRI_SENSE_MASK));
920 	vnew |= vecpri;
921 	if (vold != vnew)
922 		mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
923 
924 	return IRQ_SET_MASK_OK_NOCOPY;
925 }
926 
mpic_set_vector(unsigned int virq,unsigned int vector)927 void mpic_set_vector(unsigned int virq, unsigned int vector)
928 {
929 	struct mpic *mpic = mpic_from_irq(virq);
930 	unsigned int src = virq_to_hw(virq);
931 	unsigned int vecpri;
932 
933 	DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
934 	    mpic, virq, src, vector);
935 
936 	if (src >= mpic->num_sources)
937 		return;
938 
939 	vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
940 	vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
941 	vecpri |= vector;
942 	mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
943 }
944 
mpic_set_destination(unsigned int virq,unsigned int cpuid)945 static void mpic_set_destination(unsigned int virq, unsigned int cpuid)
946 {
947 	struct mpic *mpic = mpic_from_irq(virq);
948 	unsigned int src = virq_to_hw(virq);
949 
950 	DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
951 	    mpic, virq, src, cpuid);
952 
953 	if (src >= mpic->num_sources)
954 		return;
955 
956 	mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
957 }
958 
959 static struct irq_chip mpic_irq_chip = {
960 	.irq_mask	= mpic_mask_irq,
961 	.irq_unmask	= mpic_unmask_irq,
962 	.irq_eoi	= mpic_end_irq,
963 	.irq_set_type	= mpic_set_irq_type,
964 };
965 
966 #ifdef CONFIG_SMP
967 static struct irq_chip mpic_ipi_chip = {
968 	.irq_mask	= mpic_mask_ipi,
969 	.irq_unmask	= mpic_unmask_ipi,
970 	.irq_eoi	= mpic_end_ipi,
971 };
972 #endif /* CONFIG_SMP */
973 
974 static struct irq_chip mpic_tm_chip = {
975 	.irq_mask	= mpic_mask_tm,
976 	.irq_unmask	= mpic_unmask_tm,
977 	.irq_eoi	= mpic_end_irq,
978 };
979 
980 #ifdef CONFIG_MPIC_U3_HT_IRQS
981 static struct irq_chip mpic_irq_ht_chip = {
982 	.irq_startup	= mpic_startup_ht_irq,
983 	.irq_shutdown	= mpic_shutdown_ht_irq,
984 	.irq_mask	= mpic_mask_irq,
985 	.irq_unmask	= mpic_unmask_ht_irq,
986 	.irq_eoi	= mpic_end_ht_irq,
987 	.irq_set_type	= mpic_set_irq_type,
988 };
989 #endif /* CONFIG_MPIC_U3_HT_IRQS */
990 
991 
mpic_host_match(struct irq_domain * h,struct device_node * node,enum irq_domain_bus_token bus_token)992 static int mpic_host_match(struct irq_domain *h, struct device_node *node,
993 			   enum irq_domain_bus_token bus_token)
994 {
995 	/* Exact match, unless mpic node is NULL */
996 	struct device_node *of_node = irq_domain_get_of_node(h);
997 	return of_node == NULL || of_node == node;
998 }
999 
mpic_host_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)1000 static int mpic_host_map(struct irq_domain *h, unsigned int virq,
1001 			 irq_hw_number_t hw)
1002 {
1003 	struct mpic *mpic = h->host_data;
1004 	struct irq_chip *chip;
1005 
1006 	DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
1007 
1008 	if (hw == mpic->spurious_vec)
1009 		return -EINVAL;
1010 	if (mpic->protected && test_bit(hw, mpic->protected)) {
1011 		pr_warning("mpic: Mapping of source 0x%x failed, "
1012 			   "source protected by firmware !\n",\
1013 			   (unsigned int)hw);
1014 		return -EPERM;
1015 	}
1016 
1017 #ifdef CONFIG_SMP
1018 	else if (hw >= mpic->ipi_vecs[0]) {
1019 		WARN_ON(mpic->flags & MPIC_SECONDARY);
1020 
1021 		DBG("mpic: mapping as IPI\n");
1022 		irq_set_chip_data(virq, mpic);
1023 		irq_set_chip_and_handler(virq, &mpic->hc_ipi,
1024 					 handle_percpu_irq);
1025 		return 0;
1026 	}
1027 #endif /* CONFIG_SMP */
1028 
1029 	if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
1030 		WARN_ON(mpic->flags & MPIC_SECONDARY);
1031 
1032 		DBG("mpic: mapping as timer\n");
1033 		irq_set_chip_data(virq, mpic);
1034 		irq_set_chip_and_handler(virq, &mpic->hc_tm,
1035 					 handle_fasteoi_irq);
1036 		return 0;
1037 	}
1038 
1039 	if (mpic_map_error_int(mpic, virq, hw))
1040 		return 0;
1041 
1042 	if (hw >= mpic->num_sources) {
1043 		pr_warning("mpic: Mapping of source 0x%x failed, "
1044 			   "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 
mpic_host_xlate(struct irq_domain * h,struct device_node * ct,const u32 * intspec,unsigned int intsize,irq_hw_number_t * out_hwirq,unsigned int * out_flags)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 */
mpic_cascade(struct irq_desc * desc)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 
fsl_mpic_get_version(struct mpic * mpic)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 
fsl_mpic_primary_get_version(void)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 
mpic_alloc(struct device_node * node,phys_addr_t phys_addr,unsigned int flags,unsigned int isu_size,unsigned int irq_count,const char * name)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_get_property(node, "dcr-reg", NULL)) {
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_get_property(node, "big-endian", NULL))
1264 		flags |= MPIC_BIG_ENDIAN;
1265 	if (of_get_property(node, "pic-no-reset", NULL))
1266 		flags |= MPIC_NO_RESET;
1267 	if (of_get_property(node, "single-cpu-affinity", NULL))
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 		unsigned int mapsize = BITS_TO_LONGS(intvec_top + 1);
1329 		mpic->protected = kzalloc(mapsize*sizeof(long), GFP_KERNEL);
1330 		BUG_ON(mpic->protected == NULL);
1331 		for (i = 0; i < psize/sizeof(u32); i++) {
1332 			if (psrc[i] > intvec_top)
1333 				continue;
1334 			__set_bit(psrc[i], mpic->protected);
1335 		}
1336 	}
1337 
1338 #ifdef CONFIG_MPIC_WEIRD
1339 	mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
1340 #endif
1341 
1342 	/* default register type */
1343 	if (mpic->flags & MPIC_BIG_ENDIAN)
1344 		mpic->reg_type = mpic_access_mmio_be;
1345 	else
1346 		mpic->reg_type = mpic_access_mmio_le;
1347 
1348 	/*
1349 	 * An MPIC with a "dcr-reg" property must be accessed that way, but
1350 	 * only if the kernel includes DCR support.
1351 	 */
1352 #ifdef CONFIG_PPC_DCR
1353 	if (mpic->flags & MPIC_USES_DCR)
1354 		mpic->reg_type = mpic_access_dcr;
1355 #else
1356 	BUG_ON(mpic->flags & MPIC_USES_DCR);
1357 #endif
1358 
1359 	/* Map the global registers */
1360 	mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1361 	mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1362 
1363 	if (mpic->flags & MPIC_FSL) {
1364 		int ret;
1365 
1366 		/*
1367 		 * Yes, Freescale really did put global registers in the
1368 		 * magic per-cpu area -- and they don't even show up in the
1369 		 * non-magic per-cpu copies that this driver normally uses.
1370 		 */
1371 		mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
1372 			 MPIC_CPU_THISBASE, 0x1000);
1373 
1374 		fsl_version = fsl_mpic_get_version(mpic);
1375 
1376 		/* Error interrupt mask register (EIMR) is required for
1377 		 * handling individual device error interrupts. EIMR
1378 		 * was added in MPIC version 4.1.
1379 		 *
1380 		 * Over here we reserve vector number space for error
1381 		 * interrupt vectors. This space is stolen from the
1382 		 * global vector number space, as in case of ipis
1383 		 * and timer interrupts.
1384 		 *
1385 		 * Available vector space = intvec_top - 12, where 12
1386 		 * is the number of vectors which have been consumed by
1387 		 * ipis and timer interrupts.
1388 		 */
1389 		if (fsl_version >= 0x401) {
1390 			ret = mpic_setup_error_int(mpic, intvec_top - 12);
1391 			if (ret)
1392 				return NULL;
1393 		}
1394 
1395 	}
1396 
1397 	/*
1398 	 * EPR is only available starting with v4.0.  To support
1399 	 * platforms that don't know the MPIC version at compile-time,
1400 	 * such as qemu-e500, turn off coreint if this MPIC doesn't
1401 	 * support it.  Note that we never enable it if it wasn't
1402 	 * requested in the first place.
1403 	 *
1404 	 * This is done outside the MPIC_FSL check, so that we
1405 	 * also disable coreint if the MPIC node doesn't have
1406 	 * an "fsl,mpic" compatible at all.  This will be the case
1407 	 * with device trees generated by older versions of QEMU.
1408 	 * fsl_version will be zero if MPIC_FSL is not set.
1409 	 */
1410 	if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) {
1411 		WARN_ON(ppc_md.get_irq != mpic_get_coreint_irq);
1412 		ppc_md.get_irq = mpic_get_irq;
1413 	}
1414 
1415 	/* Reset */
1416 
1417 	/* When using a device-node, reset requests are only honored if the MPIC
1418 	 * is allowed to reset.
1419 	 */
1420 	if (!(mpic->flags & MPIC_NO_RESET)) {
1421 		printk(KERN_DEBUG "mpic: Resetting\n");
1422 		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1423 			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1424 			   | MPIC_GREG_GCONF_RESET);
1425 		while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1426 		       & MPIC_GREG_GCONF_RESET)
1427 			mb();
1428 	}
1429 
1430 	/* CoreInt */
1431 	if (mpic->flags & MPIC_ENABLE_COREINT)
1432 		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1433 			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1434 			   | MPIC_GREG_GCONF_COREINT);
1435 
1436 	if (mpic->flags & MPIC_ENABLE_MCK)
1437 		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1438 			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1439 			   | MPIC_GREG_GCONF_MCK);
1440 
1441 	/*
1442 	 * The MPIC driver will crash if there are more cores than we
1443 	 * can initialize, so we may as well catch that problem here.
1444 	 */
1445 	BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
1446 
1447 	/* Map the per-CPU registers */
1448 	for_each_possible_cpu(i) {
1449 		unsigned int cpu = get_hard_smp_processor_id(i);
1450 
1451 		mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
1452 			 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
1453 			 0x1000);
1454 	}
1455 
1456 	/*
1457 	 * Read feature register.  For non-ISU MPICs, num sources as well. On
1458 	 * ISU MPICs, sources are counted as ISUs are added
1459 	 */
1460 	greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1461 
1462 	/*
1463 	 * By default, the last source number comes from the MPIC, but the
1464 	 * device-tree and board support code can override it on buggy hw.
1465 	 * If we get passed an isu_size (multi-isu MPIC) then we use that
1466 	 * as a default instead of the value read from the HW.
1467 	 */
1468 	last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1469 				>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
1470 	if (isu_size)
1471 		last_irq = isu_size  * MPIC_MAX_ISU - 1;
1472 	of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
1473 	if (irq_count)
1474 		last_irq = irq_count - 1;
1475 
1476 	/* Initialize main ISU if none provided */
1477 	if (!isu_size) {
1478 		isu_size = last_irq + 1;
1479 		mpic->num_sources = isu_size;
1480 		mpic_map(mpic, mpic->paddr, &mpic->isus[0],
1481 				MPIC_INFO(IRQ_BASE),
1482 				MPIC_INFO(IRQ_STRIDE) * isu_size);
1483 	}
1484 
1485 	mpic->isu_size = isu_size;
1486 	mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1487 	mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1488 
1489 	mpic->irqhost = irq_domain_add_linear(mpic->node,
1490 				       intvec_top,
1491 				       &mpic_host_ops, mpic);
1492 
1493 	/*
1494 	 * FIXME: The code leaks the MPIC object and mappings here; this
1495 	 * is very unlikely to fail but it ought to be fixed anyways.
1496 	 */
1497 	if (mpic->irqhost == NULL)
1498 		return NULL;
1499 
1500 	/* Display version */
1501 	switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1502 	case 1:
1503 		vers = "1.0";
1504 		break;
1505 	case 2:
1506 		vers = "1.2";
1507 		break;
1508 	case 3:
1509 		vers = "1.3";
1510 		break;
1511 	default:
1512 		vers = "<unknown>";
1513 		break;
1514 	}
1515 	printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1516 	       " max %d CPUs\n",
1517 	       name, vers, (unsigned long long)mpic->paddr, num_possible_cpus());
1518 	printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1519 	       mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1520 
1521 	mpic->next = mpics;
1522 	mpics = mpic;
1523 
1524 	if (!(mpic->flags & MPIC_SECONDARY)) {
1525 		mpic_primary = mpic;
1526 		irq_set_default_host(mpic->irqhost);
1527 	}
1528 
1529 	return mpic;
1530 
1531 err_of_node_put:
1532 	of_node_put(node);
1533 	return NULL;
1534 }
1535 
mpic_assign_isu(struct mpic * mpic,unsigned int isu_num,phys_addr_t paddr)1536 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1537 			    phys_addr_t paddr)
1538 {
1539 	unsigned int isu_first = isu_num * mpic->isu_size;
1540 
1541 	BUG_ON(isu_num >= MPIC_MAX_ISU);
1542 
1543 	mpic_map(mpic,
1544 		 paddr, &mpic->isus[isu_num], 0,
1545 		 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1546 
1547 	if ((isu_first + mpic->isu_size) > mpic->num_sources)
1548 		mpic->num_sources = isu_first + mpic->isu_size;
1549 }
1550 
mpic_init(struct mpic * mpic)1551 void __init mpic_init(struct mpic *mpic)
1552 {
1553 	int i, cpu;
1554 	int num_timers = 4;
1555 
1556 	BUG_ON(mpic->num_sources == 0);
1557 
1558 	printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1559 
1560 	/* Set current processor priority to max */
1561 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1562 
1563 	if (mpic->flags & MPIC_FSL) {
1564 		u32 version = fsl_mpic_get_version(mpic);
1565 
1566 		/*
1567 		 * Timer group B is present at the latest in MPIC 3.1 (e.g.
1568 		 * mpc8536).  It is not present in MPIC 2.0 (e.g. mpc8544).
1569 		 * I don't know about the status of intermediate versions (or
1570 		 * whether they even exist).
1571 		 */
1572 		if (version >= 0x0301)
1573 			num_timers = 8;
1574 	}
1575 
1576 	/* Initialize timers to our reserved vectors and mask them for now */
1577 	for (i = 0; i < num_timers; i++) {
1578 		unsigned int offset = mpic_tm_offset(mpic, i);
1579 
1580 		mpic_write(mpic->tmregs,
1581 			   offset + MPIC_INFO(TIMER_DESTINATION),
1582 			   1 << hard_smp_processor_id());
1583 		mpic_write(mpic->tmregs,
1584 			   offset + MPIC_INFO(TIMER_VECTOR_PRI),
1585 			   MPIC_VECPRI_MASK |
1586 			   (9 << MPIC_VECPRI_PRIORITY_SHIFT) |
1587 			   (mpic->timer_vecs[0] + i));
1588 	}
1589 
1590 	/* Initialize IPIs to our reserved vectors and mark them disabled for now */
1591 	mpic_test_broken_ipi(mpic);
1592 	for (i = 0; i < 4; i++) {
1593 		mpic_ipi_write(i,
1594 			       MPIC_VECPRI_MASK |
1595 			       (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1596 			       (mpic->ipi_vecs[0] + i));
1597 	}
1598 
1599 	/* Do the HT PIC fixups on U3 broken mpic */
1600 	DBG("MPIC flags: %x\n", mpic->flags);
1601 	if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
1602 		mpic_scan_ht_pics(mpic);
1603 		mpic_u3msi_init(mpic);
1604 	}
1605 
1606 	mpic_pasemi_msi_init(mpic);
1607 
1608 	cpu = mpic_processor_id(mpic);
1609 
1610 	if (!(mpic->flags & MPIC_NO_RESET)) {
1611 		for (i = 0; i < mpic->num_sources; i++) {
1612 			/* start with vector = source number, and masked */
1613 			u32 vecpri = MPIC_VECPRI_MASK | i |
1614 				(8 << MPIC_VECPRI_PRIORITY_SHIFT);
1615 
1616 			/* check if protected */
1617 			if (mpic->protected && test_bit(i, mpic->protected))
1618 				continue;
1619 			/* init hw */
1620 			mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1621 			mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1622 		}
1623 	}
1624 
1625 	/* Init spurious vector */
1626 	mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1627 
1628 	/* Disable 8259 passthrough, if supported */
1629 	if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1630 		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1631 			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1632 			   | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1633 
1634 	if (mpic->flags & MPIC_NO_BIAS)
1635 		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1636 			mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1637 			| MPIC_GREG_GCONF_NO_BIAS);
1638 
1639 	/* Set current processor priority to 0 */
1640 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1641 
1642 #ifdef CONFIG_PM
1643 	/* allocate memory to save mpic state */
1644 	mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1645 				  GFP_KERNEL);
1646 	BUG_ON(mpic->save_data == NULL);
1647 #endif
1648 
1649 	/* Check if this MPIC is chained from a parent interrupt controller */
1650 	if (mpic->flags & MPIC_SECONDARY) {
1651 		int virq = irq_of_parse_and_map(mpic->node, 0);
1652 		if (virq != NO_IRQ) {
1653 			printk(KERN_INFO "%s: hooking up to IRQ %d\n",
1654 					mpic->node->full_name, virq);
1655 			irq_set_handler_data(virq, mpic);
1656 			irq_set_chained_handler(virq, &mpic_cascade);
1657 		}
1658 	}
1659 
1660 	/* FSL mpic error interrupt intialization */
1661 	if (mpic->flags & MPIC_FSL_HAS_EIMR)
1662 		mpic_err_int_init(mpic, MPIC_FSL_ERR_INT);
1663 }
1664 
mpic_irq_set_priority(unsigned int irq,unsigned int pri)1665 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1666 {
1667 	struct mpic *mpic = mpic_find(irq);
1668 	unsigned int src = virq_to_hw(irq);
1669 	unsigned long flags;
1670 	u32 reg;
1671 
1672 	if (!mpic)
1673 		return;
1674 
1675 	raw_spin_lock_irqsave(&mpic_lock, flags);
1676 	if (mpic_is_ipi(mpic, src)) {
1677 		reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1678 			~MPIC_VECPRI_PRIORITY_MASK;
1679 		mpic_ipi_write(src - mpic->ipi_vecs[0],
1680 			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1681 	} else if (mpic_is_tm(mpic, src)) {
1682 		reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
1683 			~MPIC_VECPRI_PRIORITY_MASK;
1684 		mpic_tm_write(src - mpic->timer_vecs[0],
1685 			      reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1686 	} else {
1687 		reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1688 			& ~MPIC_VECPRI_PRIORITY_MASK;
1689 		mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1690 			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1691 	}
1692 	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1693 }
1694 
mpic_setup_this_cpu(void)1695 void mpic_setup_this_cpu(void)
1696 {
1697 #ifdef CONFIG_SMP
1698 	struct mpic *mpic = mpic_primary;
1699 	unsigned long flags;
1700 	u32 msk = 1 << hard_smp_processor_id();
1701 	unsigned int i;
1702 
1703 	BUG_ON(mpic == NULL);
1704 
1705 	DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1706 
1707 	raw_spin_lock_irqsave(&mpic_lock, flags);
1708 
1709  	/* let the mpic know we want intrs. default affinity is 0xffffffff
1710 	 * until changed via /proc. That's how it's done on x86. If we want
1711 	 * it differently, then we should make sure we also change the default
1712 	 * values of irq_desc[].affinity in irq.c.
1713  	 */
1714 	if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) {
1715 	 	for (i = 0; i < mpic->num_sources ; i++)
1716 			mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1717 				mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1718 	}
1719 
1720 	/* Set current processor priority to 0 */
1721 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1722 
1723 	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1724 #endif /* CONFIG_SMP */
1725 }
1726 
mpic_cpu_get_priority(void)1727 int mpic_cpu_get_priority(void)
1728 {
1729 	struct mpic *mpic = mpic_primary;
1730 
1731 	return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1732 }
1733 
mpic_cpu_set_priority(int prio)1734 void mpic_cpu_set_priority(int prio)
1735 {
1736 	struct mpic *mpic = mpic_primary;
1737 
1738 	prio &= MPIC_CPU_TASKPRI_MASK;
1739 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1740 }
1741 
mpic_teardown_this_cpu(int secondary)1742 void mpic_teardown_this_cpu(int secondary)
1743 {
1744 	struct mpic *mpic = mpic_primary;
1745 	unsigned long flags;
1746 	u32 msk = 1 << hard_smp_processor_id();
1747 	unsigned int i;
1748 
1749 	BUG_ON(mpic == NULL);
1750 
1751 	DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1752 	raw_spin_lock_irqsave(&mpic_lock, flags);
1753 
1754 	/* let the mpic know we don't want intrs.  */
1755 	for (i = 0; i < mpic->num_sources ; i++)
1756 		mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1757 			mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1758 
1759 	/* Set current processor priority to max */
1760 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1761 	/* We need to EOI the IPI since not all platforms reset the MPIC
1762 	 * on boot and new interrupts wouldn't get delivered otherwise.
1763 	 */
1764 	mpic_eoi(mpic);
1765 
1766 	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1767 }
1768 
1769 
_mpic_get_one_irq(struct mpic * mpic,int reg)1770 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1771 {
1772 	u32 src;
1773 
1774 	src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1775 #ifdef DEBUG_LOW
1776 	DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1777 #endif
1778 	if (unlikely(src == mpic->spurious_vec)) {
1779 		if (mpic->flags & MPIC_SPV_EOI)
1780 			mpic_eoi(mpic);
1781 		return NO_IRQ;
1782 	}
1783 	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1784 		printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1785 				   mpic->name, (int)src);
1786 		mpic_eoi(mpic);
1787 		return NO_IRQ;
1788 	}
1789 
1790 	return irq_linear_revmap(mpic->irqhost, src);
1791 }
1792 
mpic_get_one_irq(struct mpic * mpic)1793 unsigned int mpic_get_one_irq(struct mpic *mpic)
1794 {
1795 	return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1796 }
1797 
mpic_get_irq(void)1798 unsigned int mpic_get_irq(void)
1799 {
1800 	struct mpic *mpic = mpic_primary;
1801 
1802 	BUG_ON(mpic == NULL);
1803 
1804 	return mpic_get_one_irq(mpic);
1805 }
1806 
mpic_get_coreint_irq(void)1807 unsigned int mpic_get_coreint_irq(void)
1808 {
1809 #ifdef CONFIG_BOOKE
1810 	struct mpic *mpic = mpic_primary;
1811 	u32 src;
1812 
1813 	BUG_ON(mpic == NULL);
1814 
1815 	src = mfspr(SPRN_EPR);
1816 
1817 	if (unlikely(src == mpic->spurious_vec)) {
1818 		if (mpic->flags & MPIC_SPV_EOI)
1819 			mpic_eoi(mpic);
1820 		return NO_IRQ;
1821 	}
1822 	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1823 		printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1824 				   mpic->name, (int)src);
1825 		return NO_IRQ;
1826 	}
1827 
1828 	return irq_linear_revmap(mpic->irqhost, src);
1829 #else
1830 	return NO_IRQ;
1831 #endif
1832 }
1833 
mpic_get_mcirq(void)1834 unsigned int mpic_get_mcirq(void)
1835 {
1836 	struct mpic *mpic = mpic_primary;
1837 
1838 	BUG_ON(mpic == NULL);
1839 
1840 	return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1841 }
1842 
1843 #ifdef CONFIG_SMP
mpic_request_ipis(void)1844 void mpic_request_ipis(void)
1845 {
1846 	struct mpic *mpic = mpic_primary;
1847 	int i;
1848 	BUG_ON(mpic == NULL);
1849 
1850 	printk(KERN_INFO "mpic: requesting IPIs...\n");
1851 
1852 	for (i = 0; i < 4; i++) {
1853 		unsigned int vipi = irq_create_mapping(mpic->irqhost,
1854 						       mpic->ipi_vecs[0] + i);
1855 		if (vipi == NO_IRQ) {
1856 			printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1857 			continue;
1858 		}
1859 		smp_request_message_ipi(vipi, i);
1860 	}
1861 }
1862 
smp_mpic_message_pass(int cpu,int msg)1863 void smp_mpic_message_pass(int cpu, int msg)
1864 {
1865 	struct mpic *mpic = mpic_primary;
1866 	u32 physmask;
1867 
1868 	BUG_ON(mpic == NULL);
1869 
1870 	/* make sure we're sending something that translates to an IPI */
1871 	if ((unsigned int)msg > 3) {
1872 		printk("SMP %d: smp_message_pass: unknown msg %d\n",
1873 		       smp_processor_id(), msg);
1874 		return;
1875 	}
1876 
1877 #ifdef DEBUG_IPI
1878 	DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
1879 #endif
1880 
1881 	physmask = 1 << get_hard_smp_processor_id(cpu);
1882 
1883 	mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1884 		       msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
1885 }
1886 
smp_mpic_probe(void)1887 void __init smp_mpic_probe(void)
1888 {
1889 	int nr_cpus;
1890 
1891 	DBG("smp_mpic_probe()...\n");
1892 
1893 	nr_cpus = num_possible_cpus();
1894 
1895 	DBG("nr_cpus: %d\n", nr_cpus);
1896 
1897 	if (nr_cpus > 1)
1898 		mpic_request_ipis();
1899 }
1900 
smp_mpic_setup_cpu(int cpu)1901 void smp_mpic_setup_cpu(int cpu)
1902 {
1903 	mpic_setup_this_cpu();
1904 }
1905 
mpic_reset_core(int cpu)1906 void mpic_reset_core(int cpu)
1907 {
1908 	struct mpic *mpic = mpic_primary;
1909 	u32 pir;
1910 	int cpuid = get_hard_smp_processor_id(cpu);
1911 	int i;
1912 
1913 	/* Set target bit for core reset */
1914 	pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1915 	pir |= (1 << cpuid);
1916 	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1917 	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1918 
1919 	/* Restore target bit after reset complete */
1920 	pir &= ~(1 << cpuid);
1921 	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1922 	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1923 
1924 	/* Perform 15 EOI on each reset core to clear pending interrupts.
1925 	 * This is required for FSL CoreNet based devices */
1926 	if (mpic->flags & MPIC_FSL) {
1927 		for (i = 0; i < 15; i++) {
1928 			_mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
1929 				      MPIC_CPU_EOI, 0);
1930 		}
1931 	}
1932 }
1933 #endif /* CONFIG_SMP */
1934 
1935 #ifdef CONFIG_PM
mpic_suspend_one(struct mpic * mpic)1936 static void mpic_suspend_one(struct mpic *mpic)
1937 {
1938 	int i;
1939 
1940 	for (i = 0; i < mpic->num_sources; i++) {
1941 		mpic->save_data[i].vecprio =
1942 			mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1943 		mpic->save_data[i].dest =
1944 			mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1945 	}
1946 }
1947 
mpic_suspend(void)1948 static int mpic_suspend(void)
1949 {
1950 	struct mpic *mpic = mpics;
1951 
1952 	while (mpic) {
1953 		mpic_suspend_one(mpic);
1954 		mpic = mpic->next;
1955 	}
1956 
1957 	return 0;
1958 }
1959 
mpic_resume_one(struct mpic * mpic)1960 static void mpic_resume_one(struct mpic *mpic)
1961 {
1962 	int i;
1963 
1964 	for (i = 0; i < mpic->num_sources; i++) {
1965 		mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1966 			       mpic->save_data[i].vecprio);
1967 		mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1968 			       mpic->save_data[i].dest);
1969 
1970 #ifdef CONFIG_MPIC_U3_HT_IRQS
1971 	if (mpic->fixups) {
1972 		struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1973 
1974 		if (fixup->base) {
1975 			/* we use the lowest bit in an inverted meaning */
1976 			if ((mpic->save_data[i].fixup_data & 1) == 0)
1977 				continue;
1978 
1979 			/* Enable and configure */
1980 			writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1981 
1982 			writel(mpic->save_data[i].fixup_data & ~1,
1983 			       fixup->base + 4);
1984 		}
1985 	}
1986 #endif
1987 	} /* end for loop */
1988 }
1989 
mpic_resume(void)1990 static void mpic_resume(void)
1991 {
1992 	struct mpic *mpic = mpics;
1993 
1994 	while (mpic) {
1995 		mpic_resume_one(mpic);
1996 		mpic = mpic->next;
1997 	}
1998 }
1999 
2000 static struct syscore_ops mpic_syscore_ops = {
2001 	.resume = mpic_resume,
2002 	.suspend = mpic_suspend,
2003 };
2004 
mpic_init_sys(void)2005 static int mpic_init_sys(void)
2006 {
2007 	register_syscore_ops(&mpic_syscore_ops);
2008 	subsys_system_register(&mpic_subsys, NULL);
2009 
2010 	return 0;
2011 }
2012 
2013 device_initcall(mpic_init_sys);
2014 #endif
2015