arch/powerpc/sysdev/mpic.c

   1 /*
   2  *  arch/powerpc/kernel/mpic.c
   3  *
   4  *  Driver for interrupt controllers following the OpenPIC standard, the
   5  *  common implementation beeing IBM's MPIC. This driver also can deal
   6  *  with various broken implementations of this HW.
   7  *
   8  *  Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   9  *  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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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  */
 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  */
 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
 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
 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
 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
 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
 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
 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
 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
 591 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 592 {
 593         return 0;
 594 }
 595
 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 */
 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 */
 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 */
 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. */
 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); ++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 */
 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 */
 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 */
 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 */
 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
 665 void mpic_unmask_irq(struct irq_data *d)
 666 {
 667         unsigned int loops = 100000;
 668         struct mpic *mpic = mpic_from_irq_data(d);
 669         unsigned int src = irqd_to_hwirq(d);
 670
 671         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
 672
 673         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 674                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 675                        ~MPIC_VECPRI_MASK);
 676         /* make sure mask gets to controller before we return to user */
 677         do {
 678                 if (!loops--) {
 679                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 680                                __func__, src);
 681                         break;
 682                 }
 683         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 684 }
 685
 686 void mpic_mask_irq(struct irq_data *d)
 687 {
 688         unsigned int loops = 100000;
 689         struct mpic *mpic = mpic_from_irq_data(d);
 690         unsigned int src = irqd_to_hwirq(d);
 691
 692         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
 693
 694         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 695                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 696                        MPIC_VECPRI_MASK);
 697
 698         /* make sure mask gets to controller before we return to user */
 699         do {
 700                 if (!loops--) {
 701                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 702                                __func__, src);
 703                         break;
 704                 }
 705         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 706 }
 707
 708 void mpic_end_irq(struct irq_data *d)
 709 {
 710         struct mpic *mpic = mpic_from_irq_data(d);
 711
 712 #ifdef DEBUG_IRQ
 713         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
 714 #endif
 715         /* We always EOI on end_irq() even for edge interrupts since that
 716          * should only lower the priority, the MPIC should have properly
 717          * latched another edge interrupt coming in anyway
 718          */
 719
 720         mpic_eoi(mpic);
 721 }
 722
 723 #ifdef CONFIG_MPIC_U3_HT_IRQS
 724
 725 static void mpic_unmask_ht_irq(struct irq_data *d)
 726 {
 727         struct mpic *mpic = mpic_from_irq_data(d);
 728         unsigned int src = irqd_to_hwirq(d);
 729
 730         mpic_unmask_irq(d);
 731
 732         if (irqd_is_level_type(d))
 733                 mpic_ht_end_irq(mpic, src);
 734 }
 735
 736 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
 737 {
 738         struct mpic *mpic = mpic_from_irq_data(d);
 739         unsigned int src = irqd_to_hwirq(d);
 740
 741         mpic_unmask_irq(d);
 742         mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
 743
 744         return 0;
 745 }
 746
 747 static void mpic_shutdown_ht_irq(struct irq_data *d)
 748 {
 749         struct mpic *mpic = mpic_from_irq_data(d);
 750         unsigned int src = irqd_to_hwirq(d);
 751
 752         mpic_shutdown_ht_interrupt(mpic, src);
 753         mpic_mask_irq(d);
 754 }
 755
 756 static void mpic_end_ht_irq(struct irq_data *d)
 757 {
 758         struct mpic *mpic = mpic_from_irq_data(d);
 759         unsigned int src = irqd_to_hwirq(d);
 760
 761 #ifdef DEBUG_IRQ
 762         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
 763 #endif
 764         /* We always EOI on end_irq() even for edge interrupts since that
 765          * should only lower the priority, the MPIC should have properly
 766          * latched another edge interrupt coming in anyway
 767          */
 768
 769         if (irqd_is_level_type(d))
 770                 mpic_ht_end_irq(mpic, src);
 771         mpic_eoi(mpic);
 772 }
 773 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 774
 775 #ifdef CONFIG_SMP
 776
 777 static void mpic_unmask_ipi(struct irq_data *d)
 778 {
 779         struct mpic *mpic = mpic_from_ipi(d);
 780         unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0];
 781
 782         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
 783         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 784 }
 785
 786 static void mpic_mask_ipi(struct irq_data *d)
 787 {
 788         /* NEVER disable an IPI... that's just plain wrong! */
 789 }
 790
 791 static void mpic_end_ipi(struct irq_data *d)
 792 {
 793         struct mpic *mpic = mpic_from_ipi(d);
 794
 795         /*
 796          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 797          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 798          * applying to them. We EOI them late to avoid re-entering.
 799          */
 800         mpic_eoi(mpic);
 801 }
 802
 803 #endif /* CONFIG_SMP */
 804
 805 static void mpic_unmask_tm(struct irq_data *d)
 806 {
 807         struct mpic *mpic = mpic_from_irq_data(d);
 808         unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
 809
 810         DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src);
 811         mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK);
 812         mpic_tm_read(src);
 813 }
 814
 815 static void mpic_mask_tm(struct irq_data *d)
 816 {
 817         struct mpic *mpic = mpic_from_irq_data(d);
 818         unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
 819
 820         mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK);
 821         mpic_tm_read(src);
 822 }
 823
 824 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 825                       bool force)
 826 {
 827         struct mpic *mpic = mpic_from_irq_data(d);
 828         unsigned int src = irqd_to_hwirq(d);
 829
 830         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
 831                 int cpuid = irq_choose_cpu(cpumask);
 832
 833                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 834         } else {
 835                 u32 mask = cpumask_bits(cpumask)[0];
 836
 837                 mask &= cpumask_bits(cpu_online_mask)[0];
 838
 839                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 840                                mpic_physmask(mask));
 841         }
 842
 843         return IRQ_SET_MASK_OK;
 844 }
 845
 846 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 847 {
 848         /* Now convert sense value */
 849         switch(type & IRQ_TYPE_SENSE_MASK) {
 850         case IRQ_TYPE_EDGE_RISING:
 851                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 852                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 853         case IRQ_TYPE_EDGE_FALLING:
 854         case IRQ_TYPE_EDGE_BOTH:
 855                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 856                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 857         case IRQ_TYPE_LEVEL_HIGH:
 858                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 859                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 860         case IRQ_TYPE_LEVEL_LOW:
 861         default:
 862                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 863                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 864         }
 865 }
 866
 867 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
 868 {
 869         struct mpic *mpic = mpic_from_irq_data(d);
 870         unsigned int src = irqd_to_hwirq(d);
 871         unsigned int vecpri, vold, vnew;
 872
 873         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 874             mpic, d->irq, src, flow_type);
 875
 876         if (src >= mpic->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
 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
 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
 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
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
1087 static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
1088                            const u32 *intspec, unsigned int intsize,
1089                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1090
1091 {
1092         struct mpic *mpic = h->host_data;
1093         static unsigned char map_mpic_senses[4] = {
1094                 IRQ_TYPE_EDGE_RISING,
1095                 IRQ_TYPE_LEVEL_LOW,
1096                 IRQ_TYPE_LEVEL_HIGH,
1097                 IRQ_TYPE_EDGE_FALLING,
1098         };
1099
1100         *out_hwirq = intspec[0];
1101         if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
1102                 /*
1103                  * Freescale MPIC with extended intspec:
1104                  * First two cells are as usual.  Third specifies
1105                  * an "interrupt type".  Fourth is type-specific data.
1106                  *
1107                  * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
1108                  */
1109                 switch (intspec[2]) {
1110                 case 0:
1111                         break;
1112                 case 1:
1113                         if (!(mpic->flags & MPIC_FSL_HAS_EIMR))
1114                                 break;
1115
1116                         if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs))
1117                                 return -EINVAL;
1118
1119                         *out_hwirq = mpic->err_int_vecs[intspec[3]];
1120
1121                         break;
1122                 case 2:
1123                         if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
1124                                 return -EINVAL;
1125
1126                         *out_hwirq = mpic->ipi_vecs[intspec[0]];
1127                         break;
1128                 case 3:
1129                         if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
1130                                 return -EINVAL;
1131
1132                         *out_hwirq = mpic->timer_vecs[intspec[0]];
1133                         break;
1134                 default:
1135                         pr_debug("%s: unknown irq type %u\n",
1136                                  __func__, intspec[2]);
1137                         return -EINVAL;
1138                 }
1139
1140                 *out_flags = map_mpic_senses[intspec[1] & 3];
1141         } else if (intsize > 1) {
1142                 u32 mask = 0x3;
1143
1144                 /* Apple invented a new race of encoding on machines with
1145                  * an HT APIC. They encode, among others, the index within
1146                  * the HT APIC. We don't care about it here since thankfully,
1147                  * it appears that they have the APIC already properly
1148                  * configured, and thus our current fixup code that reads the
1149                  * APIC config works fine. However, we still need to mask out
1150                  * bits in the specifier to make sure we only get bit 0 which
1151                  * is the level/edge bit (the only sense bit exposed by Apple),
1152                  * as their bit 1 means something else.
1153                  */
1154                 if (machine_is(powermac))
1155                         mask = 0x1;
1156                 *out_flags = map_mpic_senses[intspec[1] & mask];
1157         } else
1158                 *out_flags = IRQ_TYPE_NONE;
1159
1160         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1161             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1162
1163         return 0;
1164 }
1165
1166 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
1167 static void mpic_cascade(struct irq_desc *desc)
1168 {
1169         struct irq_chip *chip = irq_desc_get_chip(desc);
1170         struct mpic *mpic = irq_desc_get_handler_data(desc);
1171         unsigned int virq;
1172
1173         BUG_ON(!(mpic->flags & MPIC_SECONDARY));
1174
1175         virq = mpic_get_one_irq(mpic);
1176         if (virq)
1177                 generic_handle_irq(virq);
1178
1179         chip->irq_eoi(&desc->irq_data);
1180 }
1181
1182 static const struct irq_domain_ops mpic_host_ops = {
1183         .match = mpic_host_match,
1184         .map = mpic_host_map,
1185         .xlate = mpic_host_xlate,
1186 };
1187
1188 static u32 fsl_mpic_get_version(struct mpic *mpic)
1189 {
1190         u32 brr1;
1191
1192         if (!(mpic->flags & MPIC_FSL))
1193                 return 0;
1194
1195         brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
1196                         MPIC_FSL_BRR1);
1197
1198         return brr1 & MPIC_FSL_BRR1_VER;
1199 }
1200
1201 /*
1202  * Exported functions
1203  */
1204
1205 u32 fsl_mpic_primary_get_version(void)
1206 {
1207         struct mpic *mpic = mpic_primary;
1208
1209         if (mpic)
1210                 return fsl_mpic_get_version(mpic);
1211
1212         return 0;
1213 }
1214
1215 struct mpic * __init mpic_alloc(struct device_node *node,
1216                                 phys_addr_t phys_addr,
1217                                 unsigned int flags,
1218                                 unsigned int isu_size,
1219                                 unsigned int irq_count,
1220                                 const char *name)
1221 {
1222         int i, psize, intvec_top;
1223         struct mpic *mpic;
1224         u32 greg_feature;
1225         const char *vers;
1226         const u32 *psrc;
1227         u32 last_irq;
1228         u32 fsl_version = 0;
1229
1230         /* Default MPIC search parameters */
1231         static const struct of_device_id __initconst mpic_device_id[] = {
1232                 { .type       = "open-pic", },
1233                 { .compatible = "open-pic", },
1234                 {},
1235         };
1236
1237         /*
1238          * If we were not passed a device-tree node, then perform the default
1239          * search for standardized a standardized OpenPIC.
1240          */
1241         if (node) {
1242                 node = of_node_get(node);
1243         } else {
1244                 node = of_find_matching_node(NULL, mpic_device_id);
1245                 if (!node)
1246                         return NULL;
1247         }
1248
1249         /* Pick the physical address from the device tree if unspecified */
1250         if (!phys_addr) {
1251                 /* Check if it is DCR-based */
1252                 if (of_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
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
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
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
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
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
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
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
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
1793 unsigned int mpic_get_one_irq(struct mpic *mpic)
1794 {
1795         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1796 }
1797
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
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
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
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
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
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
1901 void smp_mpic_setup_cpu(int cpu)
1902 {
1903         mpic_setup_this_cpu();
1904 }
1905
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
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
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
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
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
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