1/*
   2 *  arch/powerpc/kernel/mpic.c
   3 *
   4 *  Driver for interrupt controllers following the OpenPIC standard, the
   5 *  common implementation being IBM's MPIC. This driver also can deal
   6 *  with various broken implementations of this HW.
   7 *
   8 *  Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   9 *  Copyright 2010-2012 Freescale Semiconductor, Inc.
  10 *
  11 *  This file is subject to the terms and conditions of the GNU General Public
  12 *  License.  See the file COPYING in the main directory of this archive
  13 *  for more details.
  14 */
  15
  16#undef DEBUG
  17#undef DEBUG_IPI
  18#undef DEBUG_IRQ
  19#undef DEBUG_LOW
  20
  21#include <linux/types.h>
  22#include <linux/kernel.h>
  23#include <linux/init.h>
  24#include <linux/irq.h>
  25#include <linux/smp.h>
  26#include <linux/interrupt.h>
  27#include <linux/spinlock.h>
  28#include <linux/pci.h>
  29#include <linux/slab.h>
  30#include <linux/syscore_ops.h>
  31#include <linux/ratelimit.h>
 
  32
  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
  50struct bus_type mpic_subsys = {
  51	.name = "mpic",
  52	.dev_name = "mpic",
  53};
  54EXPORT_SYMBOL_GPL(mpic_subsys);
  55
  56static struct mpic *mpics;
  57static struct mpic *mpic_primary;
  58static 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
  69static 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
 158static 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
 173static 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
 190static 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
 210static 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
 221static 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
 229static 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
 235static 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
 243static 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
 251static 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
 258static 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
 265static 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
 281static 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
 314static 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
 323static 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
 331static 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 */
 349static 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 */
 367static 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
 375static 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
 391static 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
 420static 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
 447static 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
 483static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 484				    unsigned int devfn)
 485{
 486	return;
 487}
 488#endif
 489
 490static 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
 539static 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 = kcalloc(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
 591static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 592{
 593	return 0;
 594}
 595
 596static 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 */
 603static 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 */
 612static 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 */
 618static 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. */
 624static 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 */
 636static 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 */
 643static 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 */
 649static 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 */
 655static 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
 665void 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
 686void 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
 708void 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
 725static 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
 736static 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
 747static 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
 756static 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
 777static 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
 786static void mpic_mask_ipi(struct irq_data *d)
 787{
 788	/* NEVER disable an IPI... that's just plain wrong! */
 789}
 790
 791static 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
 805static 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
 815static 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
 824int 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
 846static 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
 867int 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
 927void 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
 945static 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
 959static 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
 967static 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
 974static 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
 981static 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
 992static 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
1000static 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_warn("mpic: Mapping of source 0x%x failed, source protected by firmware !\n",
1012			(unsigned int)hw);
1013		return -EPERM;
1014	}
1015
1016#ifdef CONFIG_SMP
1017	else if (hw >= mpic->ipi_vecs[0]) {
1018		WARN_ON(mpic->flags & MPIC_SECONDARY);
1019
1020		DBG("mpic: mapping as IPI\n");
1021		irq_set_chip_data(virq, mpic);
1022		irq_set_chip_and_handler(virq, &mpic->hc_ipi,
1023					 handle_percpu_irq);
1024		return 0;
1025	}
1026#endif /* CONFIG_SMP */
1027
1028	if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
1029		WARN_ON(mpic->flags & MPIC_SECONDARY);
1030
1031		DBG("mpic: mapping as timer\n");
1032		irq_set_chip_data(virq, mpic);
1033		irq_set_chip_and_handler(virq, &mpic->hc_tm,
1034					 handle_fasteoi_irq);
1035		return 0;
1036	}
1037
1038	if (mpic_map_error_int(mpic, virq, hw))
1039		return 0;
1040
1041	if (hw >= mpic->num_sources) {
1042		pr_warn("mpic: Mapping of source 0x%x failed, source out of range !\n",
1043			(unsigned int)hw);
1044		return -EINVAL;
1045	}
1046
1047	mpic_msi_reserve_hwirq(mpic, hw);
1048
1049	/* Default chip */
1050	chip = &mpic->hc_irq;
1051
1052#ifdef CONFIG_MPIC_U3_HT_IRQS
1053	/* Check for HT interrupts, override vecpri */
1054	if (mpic_is_ht_interrupt(mpic, hw))
1055		chip = &mpic->hc_ht_irq;
1056#endif /* CONFIG_MPIC_U3_HT_IRQS */
1057
1058	DBG("mpic: mapping to irq chip @%p\n", chip);
1059
1060	irq_set_chip_data(virq, mpic);
1061	irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1062
1063	/* Set default irq type */
1064	irq_set_irq_type(virq, IRQ_TYPE_DEFAULT);
1065
1066	/* If the MPIC was reset, then all vectors have already been
1067	 * initialized.  Otherwise, a per source lazy initialization
1068	 * is done here.
1069	 */
1070	if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1071		int cpu;
1072
1073		preempt_disable();
1074		cpu = mpic_processor_id(mpic);
1075		preempt_enable();
1076
1077		mpic_set_vector(virq, hw);
1078		mpic_set_destination(virq, cpu);
1079		mpic_irq_set_priority(virq, 8);
1080	}
1081
1082	return 0;
1083}
1084
1085static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
1086			   const u32 *intspec, unsigned int intsize,
1087			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1088
1089{
1090	struct mpic *mpic = h->host_data;
1091	static unsigned char map_mpic_senses[4] = {
1092		IRQ_TYPE_EDGE_RISING,
1093		IRQ_TYPE_LEVEL_LOW,
1094		IRQ_TYPE_LEVEL_HIGH,
1095		IRQ_TYPE_EDGE_FALLING,
1096	};
1097
1098	*out_hwirq = intspec[0];
1099	if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
1100		/*
1101		 * Freescale MPIC with extended intspec:
1102		 * First two cells are as usual.  Third specifies
1103		 * an "interrupt type".  Fourth is type-specific data.
1104		 *
1105		 * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
1106		 */
1107		switch (intspec[2]) {
1108		case 0:
1109			break;
1110		case 1:
1111			if (!(mpic->flags & MPIC_FSL_HAS_EIMR))
1112				break;
1113
1114			if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs))
1115				return -EINVAL;
1116
1117			*out_hwirq = mpic->err_int_vecs[intspec[3]];
1118
1119			break;
1120		case 2:
1121			if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
1122				return -EINVAL;
1123
1124			*out_hwirq = mpic->ipi_vecs[intspec[0]];
1125			break;
1126		case 3:
1127			if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
1128				return -EINVAL;
1129
1130			*out_hwirq = mpic->timer_vecs[intspec[0]];
1131			break;
1132		default:
1133			pr_debug("%s: unknown irq type %u\n",
1134				 __func__, intspec[2]);
1135			return -EINVAL;
1136		}
1137
1138		*out_flags = map_mpic_senses[intspec[1] & 3];
1139	} else if (intsize > 1) {
1140		u32 mask = 0x3;
1141
1142		/* Apple invented a new race of encoding on machines with
1143		 * an HT APIC. They encode, among others, the index within
1144		 * the HT APIC. We don't care about it here since thankfully,
1145		 * it appears that they have the APIC already properly
1146		 * configured, and thus our current fixup code that reads the
1147		 * APIC config works fine. However, we still need to mask out
1148		 * bits in the specifier to make sure we only get bit 0 which
1149		 * is the level/edge bit (the only sense bit exposed by Apple),
1150		 * as their bit 1 means something else.
1151		 */
1152		if (machine_is(powermac))
1153			mask = 0x1;
1154		*out_flags = map_mpic_senses[intspec[1] & mask];
1155	} else
1156		*out_flags = IRQ_TYPE_NONE;
1157
1158	DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1159	    intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1160
1161	return 0;
1162}
1163
1164/* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
1165static void mpic_cascade(struct irq_desc *desc)
1166{
1167	struct irq_chip *chip = irq_desc_get_chip(desc);
1168	struct mpic *mpic = irq_desc_get_handler_data(desc);
1169	unsigned int virq;
1170
1171	BUG_ON(!(mpic->flags & MPIC_SECONDARY));
1172
1173	virq = mpic_get_one_irq(mpic);
1174	if (virq)
1175		generic_handle_irq(virq);
1176
1177	chip->irq_eoi(&desc->irq_data);
1178}
1179
1180static const struct irq_domain_ops mpic_host_ops = {
1181	.match = mpic_host_match,
1182	.map = mpic_host_map,
1183	.xlate = mpic_host_xlate,
1184};
1185
1186static u32 fsl_mpic_get_version(struct mpic *mpic)
1187{
1188	u32 brr1;
1189
1190	if (!(mpic->flags & MPIC_FSL))
1191		return 0;
1192
1193	brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
1194			MPIC_FSL_BRR1);
1195
1196	return brr1 & MPIC_FSL_BRR1_VER;
1197}
1198
1199/*
1200 * Exported functions
1201 */
1202
1203u32 fsl_mpic_primary_get_version(void)
1204{
1205	struct mpic *mpic = mpic_primary;
1206
1207	if (mpic)
1208		return fsl_mpic_get_version(mpic);
1209
1210	return 0;
1211}
1212
1213struct mpic * __init mpic_alloc(struct device_node *node,
1214				phys_addr_t phys_addr,
1215				unsigned int flags,
1216				unsigned int isu_size,
1217				unsigned int irq_count,
1218				const char *name)
1219{
1220	int i, psize, intvec_top;
1221	struct mpic *mpic;
1222	u32 greg_feature;
1223	const char *vers;
1224	const u32 *psrc;
1225	u32 last_irq;
1226	u32 fsl_version = 0;
1227
1228	/* Default MPIC search parameters */
1229	static const struct of_device_id __initconst mpic_device_id[] = {
1230		{ .type	      = "open-pic", },
1231		{ .compatible = "open-pic", },
1232		{},
1233	};
1234
1235	/*
1236	 * If we were not passed a device-tree node, then perform the default
1237	 * search for standardized a standardized OpenPIC.
1238	 */
1239	if (node) {
1240		node = of_node_get(node);
1241	} else {
1242		node = of_find_matching_node(NULL, mpic_device_id);
1243		if (!node)
1244			return NULL;
1245	}
1246
1247	/* Pick the physical address from the device tree if unspecified */
1248	if (!phys_addr) {
1249		/* Check if it is DCR-based */
1250		if (of_property_read_bool(node, "dcr-reg")) {
1251			flags |= MPIC_USES_DCR;
1252		} else {
1253			struct resource r;
1254			if (of_address_to_resource(node, 0, &r))
1255				goto err_of_node_put;
1256			phys_addr = r.start;
1257		}
1258	}
1259
1260	/* Read extra device-tree properties into the flags variable */
1261	if (of_get_property(node, "big-endian", NULL))
1262		flags |= MPIC_BIG_ENDIAN;
1263	if (of_get_property(node, "pic-no-reset", NULL))
1264		flags |= MPIC_NO_RESET;
1265	if (of_get_property(node, "single-cpu-affinity", NULL))
1266		flags |= MPIC_SINGLE_DEST_CPU;
1267	if (of_device_is_compatible(node, "fsl,mpic")) {
1268		flags |= MPIC_FSL | MPIC_LARGE_VECTORS;
1269		mpic_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
1270		mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
1271	}
1272
1273	mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1274	if (mpic == NULL)
1275		goto err_of_node_put;
1276
1277	mpic->name = name;
1278	mpic->node = node;
1279	mpic->paddr = phys_addr;
1280	mpic->flags = flags;
1281
1282	mpic->hc_irq = mpic_irq_chip;
1283	mpic->hc_irq.name = name;
1284	if (!(mpic->flags & MPIC_SECONDARY))
1285		mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1286#ifdef CONFIG_MPIC_U3_HT_IRQS
1287	mpic->hc_ht_irq = mpic_irq_ht_chip;
1288	mpic->hc_ht_irq.name = name;
1289	if (!(mpic->flags & MPIC_SECONDARY))
1290		mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1291#endif /* CONFIG_MPIC_U3_HT_IRQS */
1292
1293#ifdef CONFIG_SMP
1294	mpic->hc_ipi = mpic_ipi_chip;
1295	mpic->hc_ipi.name = name;
1296#endif /* CONFIG_SMP */
1297
1298	mpic->hc_tm = mpic_tm_chip;
1299	mpic->hc_tm.name = name;
1300
1301	mpic->num_sources = 0; /* so far */
1302
1303	if (mpic->flags & MPIC_LARGE_VECTORS)
1304		intvec_top = 2047;
1305	else
1306		intvec_top = 255;
1307
1308	mpic->timer_vecs[0] = intvec_top - 12;
1309	mpic->timer_vecs[1] = intvec_top - 11;
1310	mpic->timer_vecs[2] = intvec_top - 10;
1311	mpic->timer_vecs[3] = intvec_top - 9;
1312	mpic->timer_vecs[4] = intvec_top - 8;
1313	mpic->timer_vecs[5] = intvec_top - 7;
1314	mpic->timer_vecs[6] = intvec_top - 6;
1315	mpic->timer_vecs[7] = intvec_top - 5;
1316	mpic->ipi_vecs[0]   = intvec_top - 4;
1317	mpic->ipi_vecs[1]   = intvec_top - 3;
1318	mpic->ipi_vecs[2]   = intvec_top - 2;
1319	mpic->ipi_vecs[3]   = intvec_top - 1;
1320	mpic->spurious_vec  = intvec_top;
1321
1322	/* Look for protected sources */
1323	psrc = of_get_property(mpic->node, "protected-sources", &psize);
1324	if (psrc) {
1325		/* Allocate a bitmap with one bit per interrupt */
1326		unsigned int mapsize = BITS_TO_LONGS(intvec_top + 1);
1327		mpic->protected = kcalloc(mapsize, sizeof(long), GFP_KERNEL);
1328		BUG_ON(mpic->protected == NULL);
1329		for (i = 0; i < psize/sizeof(u32); i++) {
1330			if (psrc[i] > intvec_top)
1331				continue;
1332			__set_bit(psrc[i], mpic->protected);
1333		}
1334	}
1335
1336#ifdef CONFIG_MPIC_WEIRD
1337	mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
1338#endif
1339
1340	/* default register type */
1341	if (mpic->flags & MPIC_BIG_ENDIAN)
1342		mpic->reg_type = mpic_access_mmio_be;
1343	else
1344		mpic->reg_type = mpic_access_mmio_le;
1345
1346	/*
1347	 * An MPIC with a "dcr-reg" property must be accessed that way, but
1348	 * only if the kernel includes DCR support.
1349	 */
1350#ifdef CONFIG_PPC_DCR
1351	if (mpic->flags & MPIC_USES_DCR)
1352		mpic->reg_type = mpic_access_dcr;
1353#else
1354	BUG_ON(mpic->flags & MPIC_USES_DCR);
1355#endif
1356
1357	/* Map the global registers */
1358	mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1359	mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1360
1361	if (mpic->flags & MPIC_FSL) {
1362		int ret;
1363
1364		/*
1365		 * Yes, Freescale really did put global registers in the
1366		 * magic per-cpu area -- and they don't even show up in the
1367		 * non-magic per-cpu copies that this driver normally uses.
1368		 */
1369		mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
1370			 MPIC_CPU_THISBASE, 0x1000);
1371
1372		fsl_version = fsl_mpic_get_version(mpic);
1373
1374		/* Error interrupt mask register (EIMR) is required for
1375		 * handling individual device error interrupts. EIMR
1376		 * was added in MPIC version 4.1.
1377		 *
1378		 * Over here we reserve vector number space for error
1379		 * interrupt vectors. This space is stolen from the
1380		 * global vector number space, as in case of ipis
1381		 * and timer interrupts.
1382		 *
1383		 * Available vector space = intvec_top - 13, where 13
1384		 * is the number of vectors which have been consumed by
1385		 * ipis, timer interrupts and spurious.
1386		 */
1387		if (fsl_version >= 0x401) {
1388			ret = mpic_setup_error_int(mpic, intvec_top - 13);
1389			if (ret)
1390				return NULL;
1391		}
1392
1393	}
1394
1395	/*
1396	 * EPR is only available starting with v4.0.  To support
1397	 * platforms that don't know the MPIC version at compile-time,
1398	 * such as qemu-e500, turn off coreint if this MPIC doesn't
1399	 * support it.  Note that we never enable it if it wasn't
1400	 * requested in the first place.
1401	 *
1402	 * This is done outside the MPIC_FSL check, so that we
1403	 * also disable coreint if the MPIC node doesn't have
1404	 * an "fsl,mpic" compatible at all.  This will be the case
1405	 * with device trees generated by older versions of QEMU.
1406	 * fsl_version will be zero if MPIC_FSL is not set.
1407	 */
1408	if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) {
1409		WARN_ON(ppc_md.get_irq != mpic_get_coreint_irq);
1410		ppc_md.get_irq = mpic_get_irq;
1411	}
1412
1413	/* Reset */
1414
1415	/* When using a device-node, reset requests are only honored if the MPIC
1416	 * is allowed to reset.
1417	 */
1418	if (!(mpic->flags & MPIC_NO_RESET)) {
1419		printk(KERN_DEBUG "mpic: Resetting\n");
1420		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1421			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1422			   | MPIC_GREG_GCONF_RESET);
1423		while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1424		       & MPIC_GREG_GCONF_RESET)
1425			mb();
1426	}
1427
1428	/* CoreInt */
1429	if (mpic->flags & MPIC_ENABLE_COREINT)
1430		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1431			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1432			   | MPIC_GREG_GCONF_COREINT);
1433
1434	if (mpic->flags & MPIC_ENABLE_MCK)
1435		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1436			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1437			   | MPIC_GREG_GCONF_MCK);
1438
1439	/*
1440	 * The MPIC driver will crash if there are more cores than we
1441	 * can initialize, so we may as well catch that problem here.
1442	 */
1443	BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
1444
1445	/* Map the per-CPU registers */
1446	for_each_possible_cpu(i) {
1447		unsigned int cpu = get_hard_smp_processor_id(i);
1448
1449		mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
1450			 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
1451			 0x1000);
1452	}
1453
1454	/*
1455	 * Read feature register.  For non-ISU MPICs, num sources as well. On
1456	 * ISU MPICs, sources are counted as ISUs are added
1457	 */
1458	greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1459
1460	/*
1461	 * By default, the last source number comes from the MPIC, but the
1462	 * device-tree and board support code can override it on buggy hw.
1463	 * If we get passed an isu_size (multi-isu MPIC) then we use that
1464	 * as a default instead of the value read from the HW.
1465	 */
1466	last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1467				>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
1468	if (isu_size)
1469		last_irq = isu_size  * MPIC_MAX_ISU - 1;
1470	of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
1471	if (irq_count)
1472		last_irq = irq_count - 1;
1473
1474	/* Initialize main ISU if none provided */
1475	if (!isu_size) {
1476		isu_size = last_irq + 1;
1477		mpic->num_sources = isu_size;
1478		mpic_map(mpic, mpic->paddr, &mpic->isus[0],
1479				MPIC_INFO(IRQ_BASE),
1480				MPIC_INFO(IRQ_STRIDE) * isu_size);
1481	}
1482
1483	mpic->isu_size = isu_size;
1484	mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1485	mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1486
1487	mpic->irqhost = irq_domain_add_linear(mpic->node,
1488				       intvec_top,
1489				       &mpic_host_ops, mpic);
1490
1491	/*
1492	 * FIXME: The code leaks the MPIC object and mappings here; this
1493	 * is very unlikely to fail but it ought to be fixed anyways.
1494	 */
1495	if (mpic->irqhost == NULL)
1496		return NULL;
1497
1498	/* Display version */
1499	switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1500	case 1:
1501		vers = "1.0";
1502		break;
1503	case 2:
1504		vers = "1.2";
1505		break;
1506	case 3:
1507		vers = "1.3";
1508		break;
1509	default:
1510		vers = "<unknown>";
1511		break;
1512	}
1513	printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1514	       " max %d CPUs\n",
1515	       name, vers, (unsigned long long)mpic->paddr, num_possible_cpus());
1516	printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1517	       mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1518
1519	mpic->next = mpics;
1520	mpics = mpic;
1521
1522	if (!(mpic->flags & MPIC_SECONDARY)) {
1523		mpic_primary = mpic;
1524		irq_set_default_host(mpic->irqhost);
1525	}
1526
1527	return mpic;
1528
1529err_of_node_put:
1530	of_node_put(node);
1531	return NULL;
1532}
1533
1534void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1535			    phys_addr_t paddr)
1536{
1537	unsigned int isu_first = isu_num * mpic->isu_size;
1538
1539	BUG_ON(isu_num >= MPIC_MAX_ISU);
1540
1541	mpic_map(mpic,
1542		 paddr, &mpic->isus[isu_num], 0,
1543		 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1544
1545	if ((isu_first + mpic->isu_size) > mpic->num_sources)
1546		mpic->num_sources = isu_first + mpic->isu_size;
1547}
1548
1549void __init mpic_init(struct mpic *mpic)
1550{
1551	int i, cpu;
1552	int num_timers = 4;
1553
1554	BUG_ON(mpic->num_sources == 0);
1555
1556	printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1557
1558	/* Set current processor priority to max */
1559	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1560
1561	if (mpic->flags & MPIC_FSL) {
1562		u32 version = fsl_mpic_get_version(mpic);
1563
1564		/*
1565		 * Timer group B is present at the latest in MPIC 3.1 (e.g.
1566		 * mpc8536).  It is not present in MPIC 2.0 (e.g. mpc8544).
1567		 * I don't know about the status of intermediate versions (or
1568		 * whether they even exist).
1569		 */
1570		if (version >= 0x0301)
1571			num_timers = 8;
1572	}
1573
1574	/* Initialize timers to our reserved vectors and mask them for now */
1575	for (i = 0; i < num_timers; i++) {
1576		unsigned int offset = mpic_tm_offset(mpic, i);
1577
1578		mpic_write(mpic->tmregs,
1579			   offset + MPIC_INFO(TIMER_DESTINATION),
1580			   1 << hard_smp_processor_id());
1581		mpic_write(mpic->tmregs,
1582			   offset + MPIC_INFO(TIMER_VECTOR_PRI),
1583			   MPIC_VECPRI_MASK |
1584			   (9 << MPIC_VECPRI_PRIORITY_SHIFT) |
1585			   (mpic->timer_vecs[0] + i));
1586	}
1587
1588	/* Initialize IPIs to our reserved vectors and mark them disabled for now */
1589	mpic_test_broken_ipi(mpic);
1590	for (i = 0; i < 4; i++) {
1591		mpic_ipi_write(i,
1592			       MPIC_VECPRI_MASK |
1593			       (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1594			       (mpic->ipi_vecs[0] + i));
1595	}
1596
1597	/* Do the HT PIC fixups on U3 broken mpic */
1598	DBG("MPIC flags: %x\n", mpic->flags);
1599	if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
1600		mpic_scan_ht_pics(mpic);
1601		mpic_u3msi_init(mpic);
1602	}
1603
1604	mpic_pasemi_msi_init(mpic);
1605
1606	cpu = mpic_processor_id(mpic);
1607
1608	if (!(mpic->flags & MPIC_NO_RESET)) {
1609		for (i = 0; i < mpic->num_sources; i++) {
1610			/* start with vector = source number, and masked */
1611			u32 vecpri = MPIC_VECPRI_MASK | i |
1612				(8 << MPIC_VECPRI_PRIORITY_SHIFT);
1613
1614			/* check if protected */
1615			if (mpic->protected && test_bit(i, mpic->protected))
1616				continue;
1617			/* init hw */
1618			mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1619			mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1620		}
1621	}
1622
1623	/* Init spurious vector */
1624	mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1625
1626	/* Disable 8259 passthrough, if supported */
1627	if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1628		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1629			   mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1630			   | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1631
1632	if (mpic->flags & MPIC_NO_BIAS)
1633		mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1634			mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1635			| MPIC_GREG_GCONF_NO_BIAS);
1636
1637	/* Set current processor priority to 0 */
1638	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1639
1640#ifdef CONFIG_PM
1641	/* allocate memory to save mpic state */
1642	mpic->save_data = kmalloc_array(mpic->num_sources,
1643				        sizeof(*mpic->save_data),
1644				        GFP_KERNEL);
1645	BUG_ON(mpic->save_data == NULL);
1646#endif
1647
1648	/* Check if this MPIC is chained from a parent interrupt controller */
1649	if (mpic->flags & MPIC_SECONDARY) {
1650		int virq = irq_of_parse_and_map(mpic->node, 0);
1651		if (virq) {
1652			printk(KERN_INFO "%pOF: hooking up to IRQ %d\n",
1653					mpic->node, virq);
1654			irq_set_handler_data(virq, mpic);
1655			irq_set_chained_handler(virq, &mpic_cascade);
1656		}
1657	}
1658
1659	/* FSL mpic error interrupt initialization */
1660	if (mpic->flags & MPIC_FSL_HAS_EIMR)
1661		mpic_err_int_init(mpic, MPIC_FSL_ERR_INT);
1662}
1663
1664void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1665{
1666	struct mpic *mpic = mpic_find(irq);
1667	unsigned int src = virq_to_hw(irq);
1668	unsigned long flags;
1669	u32 reg;
1670
1671	if (!mpic)
1672		return;
1673
1674	raw_spin_lock_irqsave(&mpic_lock, flags);
1675	if (mpic_is_ipi(mpic, src)) {
1676		reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1677			~MPIC_VECPRI_PRIORITY_MASK;
1678		mpic_ipi_write(src - mpic->ipi_vecs[0],
1679			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1680	} else if (mpic_is_tm(mpic, src)) {
1681		reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
1682			~MPIC_VECPRI_PRIORITY_MASK;
1683		mpic_tm_write(src - mpic->timer_vecs[0],
1684			      reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1685	} else {
1686		reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1687			& ~MPIC_VECPRI_PRIORITY_MASK;
1688		mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1689			       reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1690	}
1691	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1692}
1693
1694void mpic_setup_this_cpu(void)
1695{
1696#ifdef CONFIG_SMP
1697	struct mpic *mpic = mpic_primary;
1698	unsigned long flags;
1699	u32 msk = 1 << hard_smp_processor_id();
1700	unsigned int i;
1701
1702	BUG_ON(mpic == NULL);
1703
1704	DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1705
1706	raw_spin_lock_irqsave(&mpic_lock, flags);
1707
1708 	/* let the mpic know we want intrs. default affinity is 0xffffffff
1709	 * until changed via /proc. That's how it's done on x86. If we want
1710	 * it differently, then we should make sure we also change the default
1711	 * values of irq_desc[].affinity in irq.c.
1712 	 */
1713	if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) {
1714	 	for (i = 0; i < mpic->num_sources ; i++)
1715			mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1716				mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1717	}
1718
1719	/* Set current processor priority to 0 */
1720	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1721
1722	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1723#endif /* CONFIG_SMP */
1724}
1725
1726int mpic_cpu_get_priority(void)
1727{
1728	struct mpic *mpic = mpic_primary;
1729
1730	return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1731}
1732
1733void mpic_cpu_set_priority(int prio)
1734{
1735	struct mpic *mpic = mpic_primary;
1736
1737	prio &= MPIC_CPU_TASKPRI_MASK;
1738	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1739}
1740
1741void mpic_teardown_this_cpu(int secondary)
1742{
1743	struct mpic *mpic = mpic_primary;
1744	unsigned long flags;
1745	u32 msk = 1 << hard_smp_processor_id();
1746	unsigned int i;
1747
1748	BUG_ON(mpic == NULL);
1749
1750	DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1751	raw_spin_lock_irqsave(&mpic_lock, flags);
1752
1753	/* let the mpic know we don't want intrs.  */
1754	for (i = 0; i < mpic->num_sources ; i++)
1755		mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1756			mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1757
1758	/* Set current processor priority to max */
1759	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1760	/* We need to EOI the IPI since not all platforms reset the MPIC
1761	 * on boot and new interrupts wouldn't get delivered otherwise.
1762	 */
1763	mpic_eoi(mpic);
1764
1765	raw_spin_unlock_irqrestore(&mpic_lock, flags);
1766}
1767
1768
1769static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1770{
1771	u32 src;
1772
1773	src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1774#ifdef DEBUG_LOW
1775	DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1776#endif
1777	if (unlikely(src == mpic->spurious_vec)) {
1778		if (mpic->flags & MPIC_SPV_EOI)
1779			mpic_eoi(mpic);
1780		return 0;
1781	}
1782	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1783		printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1784				   mpic->name, (int)src);
1785		mpic_eoi(mpic);
1786		return 0;
1787	}
1788
1789	return irq_linear_revmap(mpic->irqhost, src);
1790}
1791
1792unsigned int mpic_get_one_irq(struct mpic *mpic)
1793{
1794	return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1795}
1796
1797unsigned int mpic_get_irq(void)
1798{
1799	struct mpic *mpic = mpic_primary;
1800
1801	BUG_ON(mpic == NULL);
1802
1803	return mpic_get_one_irq(mpic);
1804}
1805
1806unsigned int mpic_get_coreint_irq(void)
1807{
1808#ifdef CONFIG_BOOKE
1809	struct mpic *mpic = mpic_primary;
1810	u32 src;
1811
1812	BUG_ON(mpic == NULL);
1813
1814	src = mfspr(SPRN_EPR);
1815
1816	if (unlikely(src == mpic->spurious_vec)) {
1817		if (mpic->flags & MPIC_SPV_EOI)
1818			mpic_eoi(mpic);
1819		return 0;
1820	}
1821	if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1822		printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1823				   mpic->name, (int)src);
1824		return 0;
1825	}
1826
1827	return irq_linear_revmap(mpic->irqhost, src);
1828#else
1829	return 0;
1830#endif
1831}
1832
1833unsigned int mpic_get_mcirq(void)
1834{
1835	struct mpic *mpic = mpic_primary;
1836
1837	BUG_ON(mpic == NULL);
1838
1839	return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1840}
1841
1842#ifdef CONFIG_SMP
1843void mpic_request_ipis(void)
1844{
1845	struct mpic *mpic = mpic_primary;
1846	int i;
1847	BUG_ON(mpic == NULL);
1848
1849	printk(KERN_INFO "mpic: requesting IPIs...\n");
1850
1851	for (i = 0; i < 4; i++) {
1852		unsigned int vipi = irq_create_mapping(mpic->irqhost,
1853						       mpic->ipi_vecs[0] + i);
1854		if (!vipi) {
1855			printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1856			continue;
1857		}
1858		smp_request_message_ipi(vipi, i);
1859	}
1860}
1861
1862void smp_mpic_message_pass(int cpu, int msg)
1863{
1864	struct mpic *mpic = mpic_primary;
1865	u32 physmask;
1866
1867	BUG_ON(mpic == NULL);
1868
1869	/* make sure we're sending something that translates to an IPI */
1870	if ((unsigned int)msg > 3) {
1871		printk("SMP %d: smp_message_pass: unknown msg %d\n",
1872		       smp_processor_id(), msg);
1873		return;
1874	}
1875
1876#ifdef DEBUG_IPI
1877	DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
1878#endif
1879
1880	physmask = 1 << get_hard_smp_processor_id(cpu);
1881
1882	mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1883		       msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
1884}
1885
1886void __init smp_mpic_probe(void)
1887{
1888	int nr_cpus;
1889
1890	DBG("smp_mpic_probe()...\n");
1891
1892	nr_cpus = num_possible_cpus();
1893
1894	DBG("nr_cpus: %d\n", nr_cpus);
1895
1896	if (nr_cpus > 1)
1897		mpic_request_ipis();
1898}
1899
1900void smp_mpic_setup_cpu(int cpu)
1901{
1902	mpic_setup_this_cpu();
1903}
1904
1905void mpic_reset_core(int cpu)
1906{
1907	struct mpic *mpic = mpic_primary;
1908	u32 pir;
1909	int cpuid = get_hard_smp_processor_id(cpu);
1910	int i;
1911
1912	/* Set target bit for core reset */
1913	pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1914	pir |= (1 << cpuid);
1915	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1916	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1917
1918	/* Restore target bit after reset complete */
1919	pir &= ~(1 << cpuid);
1920	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1921	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1922
1923	/* Perform 15 EOI on each reset core to clear pending interrupts.
1924	 * This is required for FSL CoreNet based devices */
1925	if (mpic->flags & MPIC_FSL) {
1926		for (i = 0; i < 15; i++) {
1927			_mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
1928				      MPIC_CPU_EOI, 0);
1929		}
1930	}
1931}
1932#endif /* CONFIG_SMP */
1933
1934#ifdef CONFIG_PM
1935static void mpic_suspend_one(struct mpic *mpic)
1936{
1937	int i;
1938
1939	for (i = 0; i < mpic->num_sources; i++) {
1940		mpic->save_data[i].vecprio =
1941			mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1942		mpic->save_data[i].dest =
1943			mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1944	}
1945}
1946
1947static int mpic_suspend(void)
1948{
1949	struct mpic *mpic = mpics;
1950
1951	while (mpic) {
1952		mpic_suspend_one(mpic);
1953		mpic = mpic->next;
1954	}
1955
1956	return 0;
1957}
1958
1959static void mpic_resume_one(struct mpic *mpic)
1960{
1961	int i;
1962
1963	for (i = 0; i < mpic->num_sources; i++) {
1964		mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1965			       mpic->save_data[i].vecprio);
1966		mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1967			       mpic->save_data[i].dest);
1968
1969#ifdef CONFIG_MPIC_U3_HT_IRQS
1970	if (mpic->fixups) {
1971		struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1972
1973		if (fixup->base) {
1974			/* we use the lowest bit in an inverted meaning */
1975			if ((mpic->save_data[i].fixup_data & 1) == 0)
1976				continue;
1977
1978			/* Enable and configure */
1979			writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1980
1981			writel(mpic->save_data[i].fixup_data & ~1,
1982			       fixup->base + 4);
1983		}
1984	}
1985#endif
1986	} /* end for loop */
1987}
1988
1989static void mpic_resume(void)
1990{
1991	struct mpic *mpic = mpics;
1992
1993	while (mpic) {
1994		mpic_resume_one(mpic);
1995		mpic = mpic->next;
1996	}
1997}
1998
1999static struct syscore_ops mpic_syscore_ops = {
2000	.resume = mpic_resume,
2001	.suspend = mpic_suspend,
2002};
2003
2004static int mpic_init_sys(void)
2005{
2006	int rc;
2007
2008	register_syscore_ops(&mpic_syscore_ops);
2009	rc = subsys_system_register(&mpic_subsys, NULL);
2010	if (rc) {
2011		unregister_syscore_ops(&mpic_syscore_ops);
2012		pr_err("mpic: Failed to register subsystem!\n");
2013		return rc;
2014	}
2015
2016	return 0;
2017}
2018
2019device_initcall(mpic_init_sys);
2020#endif