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/bootmem.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/pci.h>
  30 #include <linux/slab.h>
  31 #include <linux/syscore_ops.h>
  32 #include <linux/ratelimit.h>
  33
  34 #include <asm/ptrace.h>
  35 #include <asm/signal.h>
  36 #include <asm/io.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/irq.h>
  39 #include <asm/machdep.h>
  40 #include <asm/mpic.h>
  41 #include <asm/smp.h>
  42
  43 #include "mpic.h"
  44
  45 #ifdef DEBUG
  46 #define DBG(fmt...) printk(fmt)
  47 #else
  48 #define DBG(fmt...)
  49 #endif
  50
  51 static struct mpic *mpics;
  52 static struct mpic *mpic_primary;
  53 static DEFINE_RAW_SPINLOCK(mpic_lock);
  54
  55 #ifdef CONFIG_PPC32     /* XXX for now */
  56 #ifdef CONFIG_IRQ_ALL_CPUS
  57 #define distribute_irqs (1)
  58 #else
  59 #define distribute_irqs (0)
  60 #endif
  61 #endif
  62
  63 #ifdef CONFIG_MPIC_WEIRD
  64 static u32 mpic_infos[][MPIC_IDX_END] = {
  65         [0] = { /* Original OpenPIC compatible MPIC */
  66                 MPIC_GREG_BASE,
  67                 MPIC_GREG_FEATURE_0,
  68                 MPIC_GREG_GLOBAL_CONF_0,
  69                 MPIC_GREG_VENDOR_ID,
  70                 MPIC_GREG_IPI_VECTOR_PRI_0,
  71                 MPIC_GREG_IPI_STRIDE,
  72                 MPIC_GREG_SPURIOUS,
  73                 MPIC_GREG_TIMER_FREQ,
  74
  75                 MPIC_TIMER_BASE,
  76                 MPIC_TIMER_STRIDE,
  77                 MPIC_TIMER_CURRENT_CNT,
  78                 MPIC_TIMER_BASE_CNT,
  79                 MPIC_TIMER_VECTOR_PRI,
  80                 MPIC_TIMER_DESTINATION,
  81
  82                 MPIC_CPU_BASE,
  83                 MPIC_CPU_STRIDE,
  84                 MPIC_CPU_IPI_DISPATCH_0,
  85                 MPIC_CPU_IPI_DISPATCH_STRIDE,
  86                 MPIC_CPU_CURRENT_TASK_PRI,
  87                 MPIC_CPU_WHOAMI,
  88                 MPIC_CPU_INTACK,
  89                 MPIC_CPU_EOI,
  90                 MPIC_CPU_MCACK,
  91
  92                 MPIC_IRQ_BASE,
  93                 MPIC_IRQ_STRIDE,
  94                 MPIC_IRQ_VECTOR_PRI,
  95                 MPIC_VECPRI_VECTOR_MASK,
  96                 MPIC_VECPRI_POLARITY_POSITIVE,
  97                 MPIC_VECPRI_POLARITY_NEGATIVE,
  98                 MPIC_VECPRI_SENSE_LEVEL,
  99                 MPIC_VECPRI_SENSE_EDGE,
 100                 MPIC_VECPRI_POLARITY_MASK,
 101                 MPIC_VECPRI_SENSE_MASK,
 102                 MPIC_IRQ_DESTINATION
 103         },
 104         [1] = { /* Tsi108/109 PIC */
 105                 TSI108_GREG_BASE,
 106                 TSI108_GREG_FEATURE_0,
 107                 TSI108_GREG_GLOBAL_CONF_0,
 108                 TSI108_GREG_VENDOR_ID,
 109                 TSI108_GREG_IPI_VECTOR_PRI_0,
 110                 TSI108_GREG_IPI_STRIDE,
 111                 TSI108_GREG_SPURIOUS,
 112                 TSI108_GREG_TIMER_FREQ,
 113
 114                 TSI108_TIMER_BASE,
 115                 TSI108_TIMER_STRIDE,
 116                 TSI108_TIMER_CURRENT_CNT,
 117                 TSI108_TIMER_BASE_CNT,
 118                 TSI108_TIMER_VECTOR_PRI,
 119                 TSI108_TIMER_DESTINATION,
 120
 121                 TSI108_CPU_BASE,
 122                 TSI108_CPU_STRIDE,
 123                 TSI108_CPU_IPI_DISPATCH_0,
 124                 TSI108_CPU_IPI_DISPATCH_STRIDE,
 125                 TSI108_CPU_CURRENT_TASK_PRI,
 126                 TSI108_CPU_WHOAMI,
 127                 TSI108_CPU_INTACK,
 128                 TSI108_CPU_EOI,
 129                 TSI108_CPU_MCACK,
 130
 131                 TSI108_IRQ_BASE,
 132                 TSI108_IRQ_STRIDE,
 133                 TSI108_IRQ_VECTOR_PRI,
 134                 TSI108_VECPRI_VECTOR_MASK,
 135                 TSI108_VECPRI_POLARITY_POSITIVE,
 136                 TSI108_VECPRI_POLARITY_NEGATIVE,
 137                 TSI108_VECPRI_SENSE_LEVEL,
 138                 TSI108_VECPRI_SENSE_EDGE,
 139                 TSI108_VECPRI_POLARITY_MASK,
 140                 TSI108_VECPRI_SENSE_MASK,
 141                 TSI108_IRQ_DESTINATION
 142         },
 143 };
 144
 145 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
 146
 147 #else /* CONFIG_MPIC_WEIRD */
 148
 149 #define MPIC_INFO(name) MPIC_##name
 150
 151 #endif /* CONFIG_MPIC_WEIRD */
 152
 153 static inline unsigned int mpic_processor_id(struct mpic *mpic)
 154 {
 155         unsigned int cpu = 0;
 156
 157         if (!(mpic->flags & MPIC_SECONDARY))
 158                 cpu = hard_smp_processor_id();
 159
 160         return cpu;
 161 }
 162
 163 /*
 164  * Register accessor functions
 165  */
 166
 167
 168 static inline u32 _mpic_read(enum mpic_reg_type type,
 169                              struct mpic_reg_bank *rb,
 170                              unsigned int reg)
 171 {
 172         switch(type) {
 173 #ifdef CONFIG_PPC_DCR
 174         case mpic_access_dcr:
 175                 return dcr_read(rb->dhost, reg);
 176 #endif
 177         case mpic_access_mmio_be:
 178                 return in_be32(rb->base + (reg >> 2));
 179         case mpic_access_mmio_le:
 180         default:
 181                 return in_le32(rb->base + (reg >> 2));
 182         }
 183 }
 184
 185 static inline void _mpic_write(enum mpic_reg_type type,
 186                                struct mpic_reg_bank *rb,
 187                                unsigned int reg, u32 value)
 188 {
 189         switch(type) {
 190 #ifdef CONFIG_PPC_DCR
 191         case mpic_access_dcr:
 192                 dcr_write(rb->dhost, reg, value);
 193                 break;
 194 #endif
 195         case mpic_access_mmio_be:
 196                 out_be32(rb->base + (reg >> 2), value);
 197                 break;
 198         case mpic_access_mmio_le:
 199         default:
 200                 out_le32(rb->base + (reg >> 2), value);
 201                 break;
 202         }
 203 }
 204
 205 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
 206 {
 207         enum mpic_reg_type type = mpic->reg_type;
 208         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 209                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 210
 211         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
 212                 type = mpic_access_mmio_be;
 213         return _mpic_read(type, &mpic->gregs, offset);
 214 }
 215
 216 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
 217 {
 218         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 219                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 220
 221         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
 222 }
 223
 224 static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm)
 225 {
 226         return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE +
 227                (tm & 3) * MPIC_INFO(TIMER_STRIDE);
 228 }
 229
 230 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm)
 231 {
 232         unsigned int offset = mpic_tm_offset(mpic, tm) +
 233                               MPIC_INFO(TIMER_VECTOR_PRI);
 234
 235         return _mpic_read(mpic->reg_type, &mpic->tmregs, offset);
 236 }
 237
 238 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value)
 239 {
 240         unsigned int offset = mpic_tm_offset(mpic, tm) +
 241                               MPIC_INFO(TIMER_VECTOR_PRI);
 242
 243         _mpic_write(mpic->reg_type, &mpic->tmregs, offset, value);
 244 }
 245
 246 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
 247 {
 248         unsigned int cpu = mpic_processor_id(mpic);
 249
 250         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
 251 }
 252
 253 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
 254 {
 255         unsigned int cpu = mpic_processor_id(mpic);
 256
 257         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
 258 }
 259
 260 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
 261 {
 262         unsigned int    isu = src_no >> mpic->isu_shift;
 263         unsigned int    idx = src_no & mpic->isu_mask;
 264         unsigned int    val;
 265
 266         val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
 267                          reg + (idx * MPIC_INFO(IRQ_STRIDE)));
 268 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 269         if (reg == 0)
 270                 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
 271                         mpic->isu_reg0_shadow[src_no];
 272 #endif
 273         return val;
 274 }
 275
 276 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
 277                                    unsigned int reg, u32 value)
 278 {
 279         unsigned int    isu = src_no >> mpic->isu_shift;
 280         unsigned int    idx = src_no & mpic->isu_mask;
 281
 282         _mpic_write(mpic->reg_type, &mpic->isus[isu],
 283                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
 284
 285 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 286         if (reg == 0)
 287                 mpic->isu_reg0_shadow[src_no] =
 288                         value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
 289 #endif
 290 }
 291
 292 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
 293 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
 294 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
 295 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
 296 #define mpic_tm_read(i)         _mpic_tm_read(mpic,(i))
 297 #define mpic_tm_write(i,v)      _mpic_tm_write(mpic,(i),(v))
 298 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
 299 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
 300 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
 301 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
 302
 303
 304 /*
 305  * Low level utility functions
 306  */
 307
 308
 309 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
 310                            struct mpic_reg_bank *rb, unsigned int offset,
 311                            unsigned int size)
 312 {
 313         rb->base = ioremap(phys_addr + offset, size);
 314         BUG_ON(rb->base == NULL);
 315 }
 316
 317 #ifdef CONFIG_PPC_DCR
 318 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
 319                           unsigned int offset, unsigned int size)
 320 {
 321         phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0);
 322         rb->dhost = dcr_map(mpic->node, phys_addr + offset, size);
 323         BUG_ON(!DCR_MAP_OK(rb->dhost));
 324 }
 325
 326 static inline void mpic_map(struct mpic *mpic,
 327                             phys_addr_t phys_addr, struct mpic_reg_bank *rb,
 328                             unsigned int offset, unsigned int size)
 329 {
 330         if (mpic->flags & MPIC_USES_DCR)
 331                 _mpic_map_dcr(mpic, rb, offset, size);
 332         else
 333                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
 334 }
 335 #else /* CONFIG_PPC_DCR */
 336 #define mpic_map(m,p,b,o,s)     _mpic_map_mmio(m,p,b,o,s)
 337 #endif /* !CONFIG_PPC_DCR */
 338
 339
 340
 341 /* Check if we have one of those nice broken MPICs with a flipped endian on
 342  * reads from IPI registers
 343  */
 344 static void __init mpic_test_broken_ipi(struct mpic *mpic)
 345 {
 346         u32 r;
 347
 348         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
 349         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
 350
 351         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
 352                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
 353                 mpic->flags |= MPIC_BROKEN_IPI;
 354         }
 355 }
 356
 357 #ifdef CONFIG_MPIC_U3_HT_IRQS
 358
 359 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
 360  * to force the edge setting on the MPIC and do the ack workaround.
 361  */
 362 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 363 {
 364         if (source >= 128 || !mpic->fixups)
 365                 return 0;
 366         return mpic->fixups[source].base != NULL;
 367 }
 368
 369
 370 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
 371 {
 372         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 373
 374         if (fixup->applebase) {
 375                 unsigned int soff = (fixup->index >> 3) & ~3;
 376                 unsigned int mask = 1U << (fixup->index & 0x1f);
 377                 writel(mask, fixup->applebase + soff);
 378         } else {
 379                 raw_spin_lock(&mpic->fixup_lock);
 380                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
 381                 writel(fixup->data, fixup->base + 4);
 382                 raw_spin_unlock(&mpic->fixup_lock);
 383         }
 384 }
 385
 386 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
 387                                       bool level)
 388 {
 389         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 390         unsigned long flags;
 391         u32 tmp;
 392
 393         if (fixup->base == NULL)
 394                 return;
 395
 396         DBG("startup_ht_interrupt(0x%x) index: %d\n",
 397             source, fixup->index);
 398         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
 399         /* Enable and configure */
 400         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 401         tmp = readl(fixup->base + 4);
 402         tmp &= ~(0x23U);
 403         if (level)
 404                 tmp |= 0x22;
 405         writel(tmp, fixup->base + 4);
 406         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 407
 408 #ifdef CONFIG_PM
 409         /* use the lowest bit inverted to the actual HW,
 410          * set if this fixup was enabled, clear otherwise */
 411         mpic->save_data[source].fixup_data = tmp | 1;
 412 #endif
 413 }
 414
 415 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
 416 {
 417         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 418         unsigned long flags;
 419         u32 tmp;
 420
 421         if (fixup->base == NULL)
 422                 return;
 423
 424         DBG("shutdown_ht_interrupt(0x%x)\n", source);
 425
 426         /* Disable */
 427         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
 428         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 429         tmp = readl(fixup->base + 4);
 430         tmp |= 1;
 431         writel(tmp, fixup->base + 4);
 432         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 433
 434 #ifdef CONFIG_PM
 435         /* use the lowest bit inverted to the actual HW,
 436          * set if this fixup was enabled, clear otherwise */
 437         mpic->save_data[source].fixup_data = tmp & ~1;
 438 #endif
 439 }
 440
 441 #ifdef CONFIG_PCI_MSI
 442 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 443                                     unsigned int devfn)
 444 {
 445         u8 __iomem *base;
 446         u8 pos, flags;
 447         u64 addr = 0;
 448
 449         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 450              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 451                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 452                 if (id == PCI_CAP_ID_HT) {
 453                         id = readb(devbase + pos + 3);
 454                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
 455                                 break;
 456                 }
 457         }
 458
 459         if (pos == 0)
 460                 return;
 461
 462         base = devbase + pos;
 463
 464         flags = readb(base + HT_MSI_FLAGS);
 465         if (!(flags & HT_MSI_FLAGS_FIXED)) {
 466                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
 467                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
 468         }
 469
 470         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
 471                 PCI_SLOT(devfn), PCI_FUNC(devfn),
 472                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
 473
 474         if (!(flags & HT_MSI_FLAGS_ENABLE))
 475                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
 476 }
 477 #else
 478 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 479                                     unsigned int devfn)
 480 {
 481         return;
 482 }
 483 #endif
 484
 485 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
 486                                     unsigned int devfn, u32 vdid)
 487 {
 488         int i, irq, n;
 489         u8 __iomem *base;
 490         u32 tmp;
 491         u8 pos;
 492
 493         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 494              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 495                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 496                 if (id == PCI_CAP_ID_HT) {
 497                         id = readb(devbase + pos + 3);
 498                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
 499                                 break;
 500                 }
 501         }
 502         if (pos == 0)
 503                 return;
 504
 505         base = devbase + pos;
 506         writeb(0x01, base + 2);
 507         n = (readl(base + 4) >> 16) & 0xff;
 508
 509         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
 510                " has %d irqs\n",
 511                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 512
 513         for (i = 0; i <= n; i++) {
 514                 writeb(0x10 + 2 * i, base + 2);
 515                 tmp = readl(base + 4);
 516                 irq = (tmp >> 16) & 0xff;
 517                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
 518                 /* mask it , will be unmasked later */
 519                 tmp |= 0x1;
 520                 writel(tmp, base + 4);
 521                 mpic->fixups[irq].index = i;
 522                 mpic->fixups[irq].base = base;
 523                 /* Apple HT PIC has a non-standard way of doing EOIs */
 524                 if ((vdid & 0xffff) == 0x106b)
 525                         mpic->fixups[irq].applebase = devbase + 0x60;
 526                 else
 527                         mpic->fixups[irq].applebase = NULL;
 528                 writeb(0x11 + 2 * i, base + 2);
 529                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 530         }
 531 }
 532
 533
 534 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 535 {
 536         unsigned int devfn;
 537         u8 __iomem *cfgspace;
 538
 539         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 540
 541         /* Allocate fixups array */
 542         mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
 543         BUG_ON(mpic->fixups == NULL);
 544
 545         /* Init spinlock */
 546         raw_spin_lock_init(&mpic->fixup_lock);
 547
 548         /* Map U3 config space. We assume all IO-APICs are on the primary bus
 549          * so we only need to map 64kB.
 550          */
 551         cfgspace = ioremap(0xf2000000, 0x10000);
 552         BUG_ON(cfgspace == NULL);
 553
 554         /* Now we scan all slots. We do a very quick scan, we read the header
 555          * type, vendor ID and device ID only, that's plenty enough
 556          */
 557         for (devfn = 0; devfn < 0x100; devfn++) {
 558                 u8 __iomem *devbase = cfgspace + (devfn << 8);
 559                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 560                 u32 l = readl(devbase + PCI_VENDOR_ID);
 561                 u16 s;
 562
 563                 DBG("devfn %x, l: %x\n", devfn, l);
 564
 565                 /* If no device, skip */
 566                 if (l == 0xffffffff || l == 0x00000000 ||
 567                     l == 0x0000ffff || l == 0xffff0000)
 568                         goto next;
 569                 /* Check if is supports capability lists */
 570                 s = readw(devbase + PCI_STATUS);
 571                 if (!(s & PCI_STATUS_CAP_LIST))
 572                         goto next;
 573
 574                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
 575                 mpic_scan_ht_msi(mpic, devbase, devfn);
 576
 577         next:
 578                 /* next device, if function 0 */
 579                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
 580                         devfn += 7;
 581         }
 582 }
 583
 584 #else /* CONFIG_MPIC_U3_HT_IRQS */
 585
 586 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 587 {
 588         return 0;
 589 }
 590
 591 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 592 {
 593 }
 594
 595 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 596
 597 /* Find an mpic associated with a given linux interrupt */
 598 static struct mpic *mpic_find(unsigned int irq)
 599 {
 600         if (irq < NUM_ISA_INTERRUPTS)
 601                 return NULL;
 602
 603         return irq_get_chip_data(irq);
 604 }
 605
 606 /* Determine if the linux irq is an IPI */
 607 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src)
 608 {
 609         return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
 610 }
 611
 612 /* Determine if the linux irq is a timer */
 613 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src)
 614 {
 615         return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]);
 616 }
 617
 618 /* Convert a cpu mask from logical to physical cpu numbers. */
 619 static inline u32 mpic_physmask(u32 cpumask)
 620 {
 621         int i;
 622         u32 mask = 0;
 623
 624         for (i = 0; i < min(32, NR_CPUS); ++i, cpumask >>= 1)
 625                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 626         return mask;
 627 }
 628
 629 #ifdef CONFIG_SMP
 630 /* Get the mpic structure from the IPI number */
 631 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
 632 {
 633         return irq_data_get_irq_chip_data(d);
 634 }
 635 #endif
 636
 637 /* Get the mpic structure from the irq number */
 638 static inline struct mpic * mpic_from_irq(unsigned int irq)
 639 {
 640         return irq_get_chip_data(irq);
 641 }
 642
 643 /* Get the mpic structure from the irq data */
 644 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
 645 {
 646         return irq_data_get_irq_chip_data(d);
 647 }
 648
 649 /* Send an EOI */
 650 static inline void mpic_eoi(struct mpic *mpic)
 651 {
 652         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 653         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 654 }
 655
 656 /*
 657  * Linux descriptor level callbacks
 658  */
 659
 660
 661 void mpic_unmask_irq(struct irq_data *d)
 662 {
 663         unsigned int loops = 100000;
 664         struct mpic *mpic = mpic_from_irq_data(d);
 665         unsigned int src = irqd_to_hwirq(d);
 666
 667         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
 668
 669         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 670                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 671                        ~MPIC_VECPRI_MASK);
 672         /* make sure mask gets to controller before we return to user */
 673         do {
 674                 if (!loops--) {
 675                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 676                                __func__, src);
 677                         break;
 678                 }
 679         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 680 }
 681
 682 void mpic_mask_irq(struct irq_data *d)
 683 {
 684         unsigned int loops = 100000;
 685         struct mpic *mpic = mpic_from_irq_data(d);
 686         unsigned int src = irqd_to_hwirq(d);
 687
 688         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
 689
 690         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 691                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 692                        MPIC_VECPRI_MASK);
 693
 694         /* make sure mask gets to controller before we return to user */
 695         do {
 696                 if (!loops--) {
 697                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 698                                __func__, src);
 699                         break;
 700                 }
 701         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 702 }
 703
 704 void mpic_end_irq(struct irq_data *d)
 705 {
 706         struct mpic *mpic = mpic_from_irq_data(d);
 707
 708 #ifdef DEBUG_IRQ
 709         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
 710 #endif
 711         /* We always EOI on end_irq() even for edge interrupts since that
 712          * should only lower the priority, the MPIC should have properly
 713          * latched another edge interrupt coming in anyway
 714          */
 715
 716         mpic_eoi(mpic);
 717 }
 718
 719 #ifdef CONFIG_MPIC_U3_HT_IRQS
 720
 721 static void mpic_unmask_ht_irq(struct irq_data *d)
 722 {
 723         struct mpic *mpic = mpic_from_irq_data(d);
 724         unsigned int src = irqd_to_hwirq(d);
 725
 726         mpic_unmask_irq(d);
 727
 728         if (irqd_is_level_type(d))
 729                 mpic_ht_end_irq(mpic, src);
 730 }
 731
 732 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
 733 {
 734         struct mpic *mpic = mpic_from_irq_data(d);
 735         unsigned int src = irqd_to_hwirq(d);
 736
 737         mpic_unmask_irq(d);
 738         mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
 739
 740         return 0;
 741 }
 742
 743 static void mpic_shutdown_ht_irq(struct irq_data *d)
 744 {
 745         struct mpic *mpic = mpic_from_irq_data(d);
 746         unsigned int src = irqd_to_hwirq(d);
 747
 748         mpic_shutdown_ht_interrupt(mpic, src);
 749         mpic_mask_irq(d);
 750 }
 751
 752 static void mpic_end_ht_irq(struct irq_data *d)
 753 {
 754         struct mpic *mpic = mpic_from_irq_data(d);
 755         unsigned int src = irqd_to_hwirq(d);
 756
 757 #ifdef DEBUG_IRQ
 758         DBG("%s: end_irq: %d\n", mpic->name, d->irq);
 759 #endif
 760         /* We always EOI on end_irq() even for edge interrupts since that
 761          * should only lower the priority, the MPIC should have properly
 762          * latched another edge interrupt coming in anyway
 763          */
 764
 765         if (irqd_is_level_type(d))
 766                 mpic_ht_end_irq(mpic, src);
 767         mpic_eoi(mpic);
 768 }
 769 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 770
 771 #ifdef CONFIG_SMP
 772
 773 static void mpic_unmask_ipi(struct irq_data *d)
 774 {
 775         struct mpic *mpic = mpic_from_ipi(d);
 776         unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0];
 777
 778         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
 779         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 780 }
 781
 782 static void mpic_mask_ipi(struct irq_data *d)
 783 {
 784         /* NEVER disable an IPI... that's just plain wrong! */
 785 }
 786
 787 static void mpic_end_ipi(struct irq_data *d)
 788 {
 789         struct mpic *mpic = mpic_from_ipi(d);
 790
 791         /*
 792          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 793          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 794          * applying to them. We EOI them late to avoid re-entering.
 795          */
 796         mpic_eoi(mpic);
 797 }
 798
 799 #endif /* CONFIG_SMP */
 800
 801 static void mpic_unmask_tm(struct irq_data *d)
 802 {
 803         struct mpic *mpic = mpic_from_irq_data(d);
 804         unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
 805
 806         DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src);
 807         mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK);
 808         mpic_tm_read(src);
 809 }
 810
 811 static void mpic_mask_tm(struct irq_data *d)
 812 {
 813         struct mpic *mpic = mpic_from_irq_data(d);
 814         unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0];
 815
 816         mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK);
 817         mpic_tm_read(src);
 818 }
 819
 820 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 821                       bool force)
 822 {
 823         struct mpic *mpic = mpic_from_irq_data(d);
 824         unsigned int src = irqd_to_hwirq(d);
 825
 826         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
 827                 int cpuid = irq_choose_cpu(cpumask);
 828
 829                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 830         } else {
 831                 u32 mask = cpumask_bits(cpumask)[0];
 832
 833                 mask &= cpumask_bits(cpu_online_mask)[0];
 834
 835                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 836                                mpic_physmask(mask));
 837         }
 838
 839         return 0;
 840 }
 841
 842 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 843 {
 844         /* Now convert sense value */
 845         switch(type & IRQ_TYPE_SENSE_MASK) {
 846         case IRQ_TYPE_EDGE_RISING:
 847                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 848                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 849         case IRQ_TYPE_EDGE_FALLING:
 850         case IRQ_TYPE_EDGE_BOTH:
 851                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 852                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 853         case IRQ_TYPE_LEVEL_HIGH:
 854                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 855                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 856         case IRQ_TYPE_LEVEL_LOW:
 857         default:
 858                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 859                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 860         }
 861 }
 862
 863 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
 864 {
 865         struct mpic *mpic = mpic_from_irq_data(d);
 866         unsigned int src = irqd_to_hwirq(d);
 867         unsigned int vecpri, vold, vnew;
 868
 869         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 870             mpic, d->irq, src, flow_type);
 871
 872         if (src >= mpic->num_sources)
 873                 return -EINVAL;
 874
 875         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 876
 877         /* We don't support "none" type */
 878         if (flow_type == IRQ_TYPE_NONE)
 879                 flow_type = IRQ_TYPE_DEFAULT;
 880
 881         /* Default: read HW settings */
 882         if (flow_type == IRQ_TYPE_DEFAULT) {
 883                 switch(vold & (MPIC_INFO(VECPRI_POLARITY_MASK) |
 884                                MPIC_INFO(VECPRI_SENSE_MASK))) {
 885                         case MPIC_INFO(VECPRI_SENSE_EDGE) |
 886                              MPIC_INFO(VECPRI_POLARITY_POSITIVE):
 887                                 flow_type = IRQ_TYPE_EDGE_RISING;
 888                                 break;
 889                         case MPIC_INFO(VECPRI_SENSE_EDGE) |
 890                              MPIC_INFO(VECPRI_POLARITY_NEGATIVE):
 891                                 flow_type = IRQ_TYPE_EDGE_FALLING;
 892                                 break;
 893                         case MPIC_INFO(VECPRI_SENSE_LEVEL) |
 894                              MPIC_INFO(VECPRI_POLARITY_POSITIVE):
 895                                 flow_type = IRQ_TYPE_LEVEL_HIGH;
 896                                 break;
 897                         case MPIC_INFO(VECPRI_SENSE_LEVEL) |
 898                              MPIC_INFO(VECPRI_POLARITY_NEGATIVE):
 899                                 flow_type = IRQ_TYPE_LEVEL_LOW;
 900                                 break;
 901                 }
 902         }
 903
 904         /* Apply to irq desc */
 905         irqd_set_trigger_type(d, flow_type);
 906
 907         /* Apply to HW */
 908         if (mpic_is_ht_interrupt(mpic, src))
 909                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 910                         MPIC_VECPRI_SENSE_EDGE;
 911         else
 912                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 913
 914         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 915                         MPIC_INFO(VECPRI_SENSE_MASK));
 916         vnew |= vecpri;
 917         if (vold != vnew)
 918                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 919
 920         return IRQ_SET_MASK_OK_NOCOPY;
 921 }
 922
 923 void mpic_set_vector(unsigned int virq, unsigned int vector)
 924 {
 925         struct mpic *mpic = mpic_from_irq(virq);
 926         unsigned int src = virq_to_hw(virq);
 927         unsigned int vecpri;
 928
 929         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
 930             mpic, virq, src, vector);
 931
 932         if (src >= mpic->num_sources)
 933                 return;
 934
 935         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 936         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
 937         vecpri |= vector;
 938         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 939 }
 940
 941 void mpic_set_destination(unsigned int virq, unsigned int cpuid)
 942 {
 943         struct mpic *mpic = mpic_from_irq(virq);
 944         unsigned int src = virq_to_hw(virq);
 945
 946         DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
 947             mpic, virq, src, cpuid);
 948
 949         if (src >= mpic->num_sources)
 950                 return;
 951
 952         mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 953 }
 954
 955 static struct irq_chip mpic_irq_chip = {
 956         .irq_mask       = mpic_mask_irq,
 957         .irq_unmask     = mpic_unmask_irq,
 958         .irq_eoi        = mpic_end_irq,
 959         .irq_set_type   = mpic_set_irq_type,
 960 };
 961
 962 #ifdef CONFIG_SMP
 963 static struct irq_chip mpic_ipi_chip = {
 964         .irq_mask       = mpic_mask_ipi,
 965         .irq_unmask     = mpic_unmask_ipi,
 966         .irq_eoi        = mpic_end_ipi,
 967 };
 968 #endif /* CONFIG_SMP */
 969
 970 static struct irq_chip mpic_tm_chip = {
 971         .irq_mask       = mpic_mask_tm,
 972         .irq_unmask     = mpic_unmask_tm,
 973         .irq_eoi        = mpic_end_irq,
 974 };
 975
 976 #ifdef CONFIG_MPIC_U3_HT_IRQS
 977 static struct irq_chip mpic_irq_ht_chip = {
 978         .irq_startup    = mpic_startup_ht_irq,
 979         .irq_shutdown   = mpic_shutdown_ht_irq,
 980         .irq_mask       = mpic_mask_irq,
 981         .irq_unmask     = mpic_unmask_ht_irq,
 982         .irq_eoi        = mpic_end_ht_irq,
 983         .irq_set_type   = mpic_set_irq_type,
 984 };
 985 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 986
 987
 988 static int mpic_host_match(struct irq_domain *h, struct device_node *node)
 989 {
 990         /* Exact match, unless mpic node is NULL */
 991         return h->of_node == NULL || h->of_node == node;
 992 }
 993
 994 static int mpic_host_map(struct irq_domain *h, unsigned int virq,
 995                          irq_hw_number_t hw)
 996 {
 997         struct mpic *mpic = h->host_data;
 998         struct irq_chip *chip;
 999
1000         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
1001
1002         if (hw == mpic->spurious_vec)
1003                 return -EINVAL;
1004         if (mpic->protected && test_bit(hw, mpic->protected))
1005                 return -EINVAL;
1006
1007 #ifdef CONFIG_SMP
1008         else if (hw >= mpic->ipi_vecs[0]) {
1009                 WARN_ON(mpic->flags & MPIC_SECONDARY);
1010
1011                 DBG("mpic: mapping as IPI\n");
1012                 irq_set_chip_data(virq, mpic);
1013                 irq_set_chip_and_handler(virq, &mpic->hc_ipi,
1014                                          handle_percpu_irq);
1015                 return 0;
1016         }
1017 #endif /* CONFIG_SMP */
1018
1019         if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) {
1020                 WARN_ON(mpic->flags & MPIC_SECONDARY);
1021
1022                 DBG("mpic: mapping as timer\n");
1023                 irq_set_chip_data(virq, mpic);
1024                 irq_set_chip_and_handler(virq, &mpic->hc_tm,
1025                                          handle_fasteoi_irq);
1026                 return 0;
1027         }
1028
1029         if (mpic_map_error_int(mpic, virq, hw))
1030                 return 0;
1031
1032         if (hw >= mpic->num_sources)
1033                 return -EINVAL;
1034
1035         mpic_msi_reserve_hwirq(mpic, hw);
1036
1037         /* Default chip */
1038         chip = &mpic->hc_irq;
1039
1040 #ifdef CONFIG_MPIC_U3_HT_IRQS
1041         /* Check for HT interrupts, override vecpri */
1042         if (mpic_is_ht_interrupt(mpic, hw))
1043                 chip = &mpic->hc_ht_irq;
1044 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1045
1046         DBG("mpic: mapping to irq chip @%p\n", chip);
1047
1048         irq_set_chip_data(virq, mpic);
1049         irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1050
1051         /* Set default irq type */
1052         irq_set_irq_type(virq, IRQ_TYPE_DEFAULT);
1053
1054         /* If the MPIC was reset, then all vectors have already been
1055          * initialized.  Otherwise, a per source lazy initialization
1056          * is done here.
1057          */
1058         if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1059                 mpic_set_vector(virq, hw);
1060                 mpic_set_destination(virq, mpic_processor_id(mpic));
1061                 mpic_irq_set_priority(virq, 8);
1062         }
1063
1064         return 0;
1065 }
1066
1067 static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
1068                            const u32 *intspec, unsigned int intsize,
1069                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1070
1071 {
1072         struct mpic *mpic = h->host_data;
1073         static unsigned char map_mpic_senses[4] = {
1074                 IRQ_TYPE_EDGE_RISING,
1075                 IRQ_TYPE_LEVEL_LOW,
1076                 IRQ_TYPE_LEVEL_HIGH,
1077                 IRQ_TYPE_EDGE_FALLING,
1078         };
1079
1080         *out_hwirq = intspec[0];
1081         if (intsize >= 4 && (mpic->flags & MPIC_FSL)) {
1082                 /*
1083                  * Freescale MPIC with extended intspec:
1084                  * First two cells are as usual.  Third specifies
1085                  * an "interrupt type".  Fourth is type-specific data.
1086                  *
1087                  * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
1088                  */
1089                 switch (intspec[2]) {
1090                 case 0:
1091                         break;
1092                 case 1:
1093                         if (!(mpic->flags & MPIC_FSL_HAS_EIMR))
1094                                 break;
1095
1096                         if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs))
1097                                 return -EINVAL;
1098
1099                         *out_hwirq = mpic->err_int_vecs[intspec[3]];
1100
1101                         break;
1102                 case 2:
1103                         if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs))
1104                                 return -EINVAL;
1105
1106                         *out_hwirq = mpic->ipi_vecs[intspec[0]];
1107                         break;
1108                 case 3:
1109                         if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs))
1110                                 return -EINVAL;
1111
1112                         *out_hwirq = mpic->timer_vecs[intspec[0]];
1113                         break;
1114                 default:
1115                         pr_debug("%s: unknown irq type %u\n",
1116                                  __func__, intspec[2]);
1117                         return -EINVAL;
1118                 }
1119
1120                 *out_flags = map_mpic_senses[intspec[1] & 3];
1121         } else if (intsize > 1) {
1122                 u32 mask = 0x3;
1123
1124                 /* Apple invented a new race of encoding on machines with
1125                  * an HT APIC. They encode, among others, the index within
1126                  * the HT APIC. We don't care about it here since thankfully,
1127                  * it appears that they have the APIC already properly
1128                  * configured, and thus our current fixup code that reads the
1129                  * APIC config works fine. However, we still need to mask out
1130                  * bits in the specifier to make sure we only get bit 0 which
1131                  * is the level/edge bit (the only sense bit exposed by Apple),
1132                  * as their bit 1 means something else.
1133                  */
1134                 if (machine_is(powermac))
1135                         mask = 0x1;
1136                 *out_flags = map_mpic_senses[intspec[1] & mask];
1137         } else
1138                 *out_flags = IRQ_TYPE_NONE;
1139
1140         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1141             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1142
1143         return 0;
1144 }
1145
1146 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
1147 static void mpic_cascade(unsigned int irq, struct irq_desc *desc)
1148 {
1149         struct irq_chip *chip = irq_desc_get_chip(desc);
1150         struct mpic *mpic = irq_desc_get_handler_data(desc);
1151         unsigned int virq;
1152
1153         BUG_ON(!(mpic->flags & MPIC_SECONDARY));
1154
1155         virq = mpic_get_one_irq(mpic);
1156         if (virq)
1157                 generic_handle_irq(virq);
1158
1159         chip->irq_eoi(&desc->irq_data);
1160 }
1161
1162 static struct irq_domain_ops mpic_host_ops = {
1163         .match = mpic_host_match,
1164         .map = mpic_host_map,
1165         .xlate = mpic_host_xlate,
1166 };
1167
1168 /*
1169  * Exported functions
1170  */
1171
1172 struct mpic * __init mpic_alloc(struct device_node *node,
1173                                 phys_addr_t phys_addr,
1174                                 unsigned int flags,
1175                                 unsigned int isu_size,
1176                                 unsigned int irq_count,
1177                                 const char *name)
1178 {
1179         int i, psize, intvec_top;
1180         struct mpic *mpic;
1181         u32 greg_feature;
1182         const char *vers;
1183         const u32 *psrc;
1184         u32 last_irq;
1185
1186         /* Default MPIC search parameters */
1187         static const struct of_device_id __initconst mpic_device_id[] = {
1188                 { .type       = "open-pic", },
1189                 { .compatible = "open-pic", },
1190                 {},
1191         };
1192
1193         /*
1194          * If we were not passed a device-tree node, then perform the default
1195          * search for standardized a standardized OpenPIC.
1196          */
1197         if (node) {
1198                 node = of_node_get(node);
1199         } else {
1200                 node = of_find_matching_node(NULL, mpic_device_id);
1201                 if (!node)
1202                         return NULL;
1203         }
1204
1205         /* Pick the physical address from the device tree if unspecified */
1206         if (!phys_addr) {
1207                 /* Check if it is DCR-based */
1208                 if (of_get_property(node, "dcr-reg", NULL)) {
1209                         flags |= MPIC_USES_DCR;
1210                 } else {
1211                         struct resource r;
1212                         if (of_address_to_resource(node, 0, &r))
1213                                 goto err_of_node_put;
1214                         phys_addr = r.start;
1215                 }
1216         }
1217
1218         /* Read extra device-tree properties into the flags variable */
1219         if (of_get_property(node, "big-endian", NULL))
1220                 flags |= MPIC_BIG_ENDIAN;
1221         if (of_get_property(node, "pic-no-reset", NULL))
1222                 flags |= MPIC_NO_RESET;
1223         if (of_get_property(node, "single-cpu-affinity", NULL))
1224                 flags |= MPIC_SINGLE_DEST_CPU;
1225         if (of_device_is_compatible(node, "fsl,mpic"))
1226                 flags |= MPIC_FSL | MPIC_LARGE_VECTORS;
1227
1228         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1229         if (mpic == NULL)
1230                 goto err_of_node_put;
1231
1232         mpic->name = name;
1233         mpic->node = node;
1234         mpic->paddr = phys_addr;
1235         mpic->flags = flags;
1236
1237         mpic->hc_irq = mpic_irq_chip;
1238         mpic->hc_irq.name = name;
1239         if (!(mpic->flags & MPIC_SECONDARY))
1240                 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1241 #ifdef CONFIG_MPIC_U3_HT_IRQS
1242         mpic->hc_ht_irq = mpic_irq_ht_chip;
1243         mpic->hc_ht_irq.name = name;
1244         if (!(mpic->flags & MPIC_SECONDARY))
1245                 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1246 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1247
1248 #ifdef CONFIG_SMP
1249         mpic->hc_ipi = mpic_ipi_chip;
1250         mpic->hc_ipi.name = name;
1251 #endif /* CONFIG_SMP */
1252
1253         mpic->hc_tm = mpic_tm_chip;
1254         mpic->hc_tm.name = name;
1255
1256         mpic->num_sources = 0; /* so far */
1257
1258         if (mpic->flags & MPIC_LARGE_VECTORS)
1259                 intvec_top = 2047;
1260         else
1261                 intvec_top = 255;
1262
1263         mpic->timer_vecs[0] = intvec_top - 12;
1264         mpic->timer_vecs[1] = intvec_top - 11;
1265         mpic->timer_vecs[2] = intvec_top - 10;
1266         mpic->timer_vecs[3] = intvec_top - 9;
1267         mpic->timer_vecs[4] = intvec_top - 8;
1268         mpic->timer_vecs[5] = intvec_top - 7;
1269         mpic->timer_vecs[6] = intvec_top - 6;
1270         mpic->timer_vecs[7] = intvec_top - 5;
1271         mpic->ipi_vecs[0]   = intvec_top - 4;
1272         mpic->ipi_vecs[1]   = intvec_top - 3;
1273         mpic->ipi_vecs[2]   = intvec_top - 2;
1274         mpic->ipi_vecs[3]   = intvec_top - 1;
1275         mpic->spurious_vec  = intvec_top;
1276
1277         /* Look for protected sources */
1278         psrc = of_get_property(mpic->node, "protected-sources", &psize);
1279         if (psrc) {
1280                 /* Allocate a bitmap with one bit per interrupt */
1281                 unsigned int mapsize = BITS_TO_LONGS(intvec_top + 1);
1282                 mpic->protected = kzalloc(mapsize*sizeof(long), GFP_KERNEL);
1283                 BUG_ON(mpic->protected == NULL);
1284                 for (i = 0; i < psize/sizeof(u32); i++) {
1285                         if (psrc[i] > intvec_top)
1286                                 continue;
1287                         __set_bit(psrc[i], mpic->protected);
1288                 }
1289         }
1290
1291 #ifdef CONFIG_MPIC_WEIRD
1292         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
1293 #endif
1294
1295         /* default register type */
1296         if (mpic->flags & MPIC_BIG_ENDIAN)
1297                 mpic->reg_type = mpic_access_mmio_be;
1298         else
1299                 mpic->reg_type = mpic_access_mmio_le;
1300
1301         /*
1302          * An MPIC with a "dcr-reg" property must be accessed that way, but
1303          * only if the kernel includes DCR support.
1304          */
1305 #ifdef CONFIG_PPC_DCR
1306         if (mpic->flags & MPIC_USES_DCR)
1307                 mpic->reg_type = mpic_access_dcr;
1308 #else
1309         BUG_ON(mpic->flags & MPIC_USES_DCR);
1310 #endif
1311
1312         /* Map the global registers */
1313         mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1314         mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1315
1316         if (mpic->flags & MPIC_FSL) {
1317                 u32 brr1, version;
1318                 int ret;
1319
1320                 /*
1321                  * Yes, Freescale really did put global registers in the
1322                  * magic per-cpu area -- and they don't even show up in the
1323                  * non-magic per-cpu copies that this driver normally uses.
1324                  */
1325                 mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
1326                          MPIC_CPU_THISBASE, 0x1000);
1327
1328                 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
1329                                 MPIC_FSL_BRR1);
1330                 version = brr1 & MPIC_FSL_BRR1_VER;
1331
1332                 /* Error interrupt mask register (EIMR) is required for
1333                  * handling individual device error interrupts. EIMR
1334                  * was added in MPIC version 4.1.
1335                  *
1336                  * Over here we reserve vector number space for error
1337                  * interrupt vectors. This space is stolen from the
1338                  * global vector number space, as in case of ipis
1339                  * and timer interrupts.
1340                  *
1341                  * Available vector space = intvec_top - 12, where 12
1342                  * is the number of vectors which have been consumed by
1343                  * ipis and timer interrupts.
1344                  */
1345                 if (version >= 0x401) {
1346                         ret = mpic_setup_error_int(mpic, intvec_top - 12);
1347                         if (ret)
1348                                 return NULL;
1349                 }
1350         }
1351
1352         /* Reset */
1353
1354         /* When using a device-node, reset requests are only honored if the MPIC
1355          * is allowed to reset.
1356          */
1357         if (!(mpic->flags & MPIC_NO_RESET)) {
1358                 printk(KERN_DEBUG "mpic: Resetting\n");
1359                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1360                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1361                            | MPIC_GREG_GCONF_RESET);
1362                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1363                        & MPIC_GREG_GCONF_RESET)
1364                         mb();
1365         }
1366
1367         /* CoreInt */
1368         if (mpic->flags & MPIC_ENABLE_COREINT)
1369                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1370                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1371                            | MPIC_GREG_GCONF_COREINT);
1372
1373         if (mpic->flags & MPIC_ENABLE_MCK)
1374                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1375                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1376                            | MPIC_GREG_GCONF_MCK);
1377
1378         /*
1379          * The MPIC driver will crash if there are more cores than we
1380          * can initialize, so we may as well catch that problem here.
1381          */
1382         BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS);
1383
1384         /* Map the per-CPU registers */
1385         for_each_possible_cpu(i) {
1386                 unsigned int cpu = get_hard_smp_processor_id(i);
1387
1388                 mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu],
1389                          MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE),
1390                          0x1000);
1391         }
1392
1393         /*
1394          * Read feature register.  For non-ISU MPICs, num sources as well. On
1395          * ISU MPICs, sources are counted as ISUs are added
1396          */
1397         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1398
1399         /*
1400          * By default, the last source number comes from the MPIC, but the
1401          * device-tree and board support code can override it on buggy hw.
1402          * If we get passed an isu_size (multi-isu MPIC) then we use that
1403          * as a default instead of the value read from the HW.
1404          */
1405         last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1406                                 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
1407         if (isu_size)
1408                 last_irq = isu_size  * MPIC_MAX_ISU - 1;
1409         of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
1410         if (irq_count)
1411                 last_irq = irq_count - 1;
1412
1413         /* Initialize main ISU if none provided */
1414         if (!isu_size) {
1415                 isu_size = last_irq + 1;
1416                 mpic->num_sources = isu_size;
1417                 mpic_map(mpic, mpic->paddr, &mpic->isus[0],
1418                                 MPIC_INFO(IRQ_BASE),
1419                                 MPIC_INFO(IRQ_STRIDE) * isu_size);
1420         }
1421
1422         mpic->isu_size = isu_size;
1423         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1424         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1425
1426         mpic->irqhost = irq_domain_add_linear(mpic->node,
1427                                        intvec_top,
1428                                        &mpic_host_ops, mpic);
1429
1430         /*
1431          * FIXME: The code leaks the MPIC object and mappings here; this
1432          * is very unlikely to fail but it ought to be fixed anyways.
1433          */
1434         if (mpic->irqhost == NULL)
1435                 return NULL;
1436
1437         /* Display version */
1438         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1439         case 1:
1440                 vers = "1.0";
1441                 break;
1442         case 2:
1443                 vers = "1.2";
1444                 break;
1445         case 3:
1446                 vers = "1.3";
1447                 break;
1448         default:
1449                 vers = "<unknown>";
1450                 break;
1451         }
1452         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1453                " max %d CPUs\n",
1454                name, vers, (unsigned long long)mpic->paddr, num_possible_cpus());
1455         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1456                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1457
1458         mpic->next = mpics;
1459         mpics = mpic;
1460
1461         if (!(mpic->flags & MPIC_SECONDARY)) {
1462                 mpic_primary = mpic;
1463                 irq_set_default_host(mpic->irqhost);
1464         }
1465
1466         return mpic;
1467
1468 err_of_node_put:
1469         of_node_put(node);
1470         return NULL;
1471 }
1472
1473 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1474                             phys_addr_t paddr)
1475 {
1476         unsigned int isu_first = isu_num * mpic->isu_size;
1477
1478         BUG_ON(isu_num >= MPIC_MAX_ISU);
1479
1480         mpic_map(mpic,
1481                  paddr, &mpic->isus[isu_num], 0,
1482                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1483
1484         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1485                 mpic->num_sources = isu_first + mpic->isu_size;
1486 }
1487
1488 void __init mpic_init(struct mpic *mpic)
1489 {
1490         int i, cpu;
1491         int num_timers = 4;
1492
1493         BUG_ON(mpic->num_sources == 0);
1494
1495         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1496
1497         /* Set current processor priority to max */
1498         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1499
1500         if (mpic->flags & MPIC_FSL) {
1501                 u32 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
1502                                       MPIC_FSL_BRR1);
1503                 u32 version = brr1 & MPIC_FSL_BRR1_VER;
1504
1505                 /*
1506                  * Timer group B is present at the latest in MPIC 3.1 (e.g.
1507                  * mpc8536).  It is not present in MPIC 2.0 (e.g. mpc8544).
1508                  * I don't know about the status of intermediate versions (or
1509                  * whether they even exist).
1510                  */
1511                 if (version >= 0x0301)
1512                         num_timers = 8;
1513         }
1514
1515         /* FSL mpic error interrupt intialization */
1516         if (mpic->flags & MPIC_FSL_HAS_EIMR)
1517                 mpic_err_int_init(mpic, MPIC_FSL_ERR_INT);
1518
1519         /* Initialize timers to our reserved vectors and mask them for now */
1520         for (i = 0; i < num_timers; i++) {
1521                 unsigned int offset = mpic_tm_offset(mpic, i);
1522
1523                 mpic_write(mpic->tmregs,
1524                            offset + MPIC_INFO(TIMER_DESTINATION),
1525                            1 << hard_smp_processor_id());
1526                 mpic_write(mpic->tmregs,
1527                            offset + MPIC_INFO(TIMER_VECTOR_PRI),
1528                            MPIC_VECPRI_MASK |
1529                            (9 << MPIC_VECPRI_PRIORITY_SHIFT) |
1530                            (mpic->timer_vecs[0] + i));
1531         }
1532
1533         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1534         mpic_test_broken_ipi(mpic);
1535         for (i = 0; i < 4; i++) {
1536                 mpic_ipi_write(i,
1537                                MPIC_VECPRI_MASK |
1538                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1539                                (mpic->ipi_vecs[0] + i));
1540         }
1541
1542         /* Do the HT PIC fixups on U3 broken mpic */
1543         DBG("MPIC flags: %x\n", mpic->flags);
1544         if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) {
1545                 mpic_scan_ht_pics(mpic);
1546                 mpic_u3msi_init(mpic);
1547         }
1548
1549         mpic_pasemi_msi_init(mpic);
1550
1551         cpu = mpic_processor_id(mpic);
1552
1553         if (!(mpic->flags & MPIC_NO_RESET)) {
1554                 for (i = 0; i < mpic->num_sources; i++) {
1555                         /* start with vector = source number, and masked */
1556                         u32 vecpri = MPIC_VECPRI_MASK | i |
1557                                 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1558
1559                         /* check if protected */
1560                         if (mpic->protected && test_bit(i, mpic->protected))
1561                                 continue;
1562                         /* init hw */
1563                         mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1564                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1565                 }
1566         }
1567
1568         /* Init spurious vector */
1569         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1570
1571         /* Disable 8259 passthrough, if supported */
1572         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1573                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1574                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1575                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1576
1577         if (mpic->flags & MPIC_NO_BIAS)
1578                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1579                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1580                         | MPIC_GREG_GCONF_NO_BIAS);
1581
1582         /* Set current processor priority to 0 */
1583         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1584
1585 #ifdef CONFIG_PM
1586         /* allocate memory to save mpic state */
1587         mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1588                                   GFP_KERNEL);
1589         BUG_ON(mpic->save_data == NULL);
1590 #endif
1591
1592         /* Check if this MPIC is chained from a parent interrupt controller */
1593         if (mpic->flags & MPIC_SECONDARY) {
1594                 int virq = irq_of_parse_and_map(mpic->node, 0);
1595                 if (virq != NO_IRQ) {
1596                         printk(KERN_INFO "%s: hooking up to IRQ %d\n",
1597                                         mpic->node->full_name, virq);
1598                         irq_set_handler_data(virq, mpic);
1599                         irq_set_chained_handler(virq, &mpic_cascade);
1600                 }
1601         }
1602 }
1603
1604 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1605 {
1606         u32 v;
1607
1608         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1609         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1610         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1611         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1612 }
1613
1614 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1615 {
1616         unsigned long flags;
1617         u32 v;
1618
1619         raw_spin_lock_irqsave(&mpic_lock, flags);
1620         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1621         if (enable)
1622                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1623         else
1624                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1625         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1626         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1627 }
1628
1629 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1630 {
1631         struct mpic *mpic = mpic_find(irq);
1632         unsigned int src = virq_to_hw(irq);
1633         unsigned long flags;
1634         u32 reg;
1635
1636         if (!mpic)
1637                 return;
1638
1639         raw_spin_lock_irqsave(&mpic_lock, flags);
1640         if (mpic_is_ipi(mpic, src)) {
1641                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1642                         ~MPIC_VECPRI_PRIORITY_MASK;
1643                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1644                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1645         } else if (mpic_is_tm(mpic, src)) {
1646                 reg = mpic_tm_read(src - mpic->timer_vecs[0]) &
1647                         ~MPIC_VECPRI_PRIORITY_MASK;
1648                 mpic_tm_write(src - mpic->timer_vecs[0],
1649                               reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1650         } else {
1651                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1652                         & ~MPIC_VECPRI_PRIORITY_MASK;
1653                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1654                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1655         }
1656         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1657 }
1658
1659 void mpic_setup_this_cpu(void)
1660 {
1661 #ifdef CONFIG_SMP
1662         struct mpic *mpic = mpic_primary;
1663         unsigned long flags;
1664         u32 msk = 1 << hard_smp_processor_id();
1665         unsigned int i;
1666
1667         BUG_ON(mpic == NULL);
1668
1669         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1670
1671         raw_spin_lock_irqsave(&mpic_lock, flags);
1672
1673         /* let the mpic know we want intrs. default affinity is 0xffffffff
1674          * until changed via /proc. That's how it's done on x86. If we want
1675          * it differently, then we should make sure we also change the default
1676          * values of irq_desc[].affinity in irq.c.
1677          */
1678         if (distribute_irqs) {
1679                 for (i = 0; i < mpic->num_sources ; i++)
1680                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1681                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1682         }
1683
1684         /* Set current processor priority to 0 */
1685         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1686
1687         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1688 #endif /* CONFIG_SMP */
1689 }
1690
1691 int mpic_cpu_get_priority(void)
1692 {
1693         struct mpic *mpic = mpic_primary;
1694
1695         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1696 }
1697
1698 void mpic_cpu_set_priority(int prio)
1699 {
1700         struct mpic *mpic = mpic_primary;
1701
1702         prio &= MPIC_CPU_TASKPRI_MASK;
1703         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1704 }
1705
1706 void mpic_teardown_this_cpu(int secondary)
1707 {
1708         struct mpic *mpic = mpic_primary;
1709         unsigned long flags;
1710         u32 msk = 1 << hard_smp_processor_id();
1711         unsigned int i;
1712
1713         BUG_ON(mpic == NULL);
1714
1715         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1716         raw_spin_lock_irqsave(&mpic_lock, flags);
1717
1718         /* let the mpic know we don't want intrs.  */
1719         for (i = 0; i < mpic->num_sources ; i++)
1720                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1721                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1722
1723         /* Set current processor priority to max */
1724         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1725         /* We need to EOI the IPI since not all platforms reset the MPIC
1726          * on boot and new interrupts wouldn't get delivered otherwise.
1727          */
1728         mpic_eoi(mpic);
1729
1730         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1731 }
1732
1733
1734 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1735 {
1736         u32 src;
1737
1738         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1739 #ifdef DEBUG_LOW
1740         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1741 #endif
1742         if (unlikely(src == mpic->spurious_vec)) {
1743                 if (mpic->flags & MPIC_SPV_EOI)
1744                         mpic_eoi(mpic);
1745                 return NO_IRQ;
1746         }
1747         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1748                 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1749                                    mpic->name, (int)src);
1750                 mpic_eoi(mpic);
1751                 return NO_IRQ;
1752         }
1753
1754         return irq_linear_revmap(mpic->irqhost, src);
1755 }
1756
1757 unsigned int mpic_get_one_irq(struct mpic *mpic)
1758 {
1759         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1760 }
1761
1762 unsigned int mpic_get_irq(void)
1763 {
1764         struct mpic *mpic = mpic_primary;
1765
1766         BUG_ON(mpic == NULL);
1767
1768         return mpic_get_one_irq(mpic);
1769 }
1770
1771 unsigned int mpic_get_coreint_irq(void)
1772 {
1773 #ifdef CONFIG_BOOKE
1774         struct mpic *mpic = mpic_primary;
1775         u32 src;
1776
1777         BUG_ON(mpic == NULL);
1778
1779         src = mfspr(SPRN_EPR);
1780
1781         if (unlikely(src == mpic->spurious_vec)) {
1782                 if (mpic->flags & MPIC_SPV_EOI)
1783                         mpic_eoi(mpic);
1784                 return NO_IRQ;
1785         }
1786         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1787                 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n",
1788                                    mpic->name, (int)src);
1789                 return NO_IRQ;
1790         }
1791
1792         return irq_linear_revmap(mpic->irqhost, src);
1793 #else
1794         return NO_IRQ;
1795 #endif
1796 }
1797
1798 unsigned int mpic_get_mcirq(void)
1799 {
1800         struct mpic *mpic = mpic_primary;
1801
1802         BUG_ON(mpic == NULL);
1803
1804         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1805 }
1806
1807 #ifdef CONFIG_SMP
1808 void mpic_request_ipis(void)
1809 {
1810         struct mpic *mpic = mpic_primary;
1811         int i;
1812         BUG_ON(mpic == NULL);
1813
1814         printk(KERN_INFO "mpic: requesting IPIs...\n");
1815
1816         for (i = 0; i < 4; i++) {
1817                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1818                                                        mpic->ipi_vecs[0] + i);
1819                 if (vipi == NO_IRQ) {
1820                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1821                         continue;
1822                 }
1823                 smp_request_message_ipi(vipi, i);
1824         }
1825 }
1826
1827 void smp_mpic_message_pass(int cpu, int msg)
1828 {
1829         struct mpic *mpic = mpic_primary;
1830         u32 physmask;
1831
1832         BUG_ON(mpic == NULL);
1833
1834         /* make sure we're sending something that translates to an IPI */
1835         if ((unsigned int)msg > 3) {
1836                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1837                        smp_processor_id(), msg);
1838                 return;
1839         }
1840
1841 #ifdef DEBUG_IPI
1842         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg);
1843 #endif
1844
1845         physmask = 1 << get_hard_smp_processor_id(cpu);
1846
1847         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1848                        msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask);
1849 }
1850
1851 int __init smp_mpic_probe(void)
1852 {
1853         int nr_cpus;
1854
1855         DBG("smp_mpic_probe()...\n");
1856
1857         nr_cpus = cpumask_weight(cpu_possible_mask);
1858
1859         DBG("nr_cpus: %d\n", nr_cpus);
1860
1861         if (nr_cpus > 1)
1862                 mpic_request_ipis();
1863
1864         return nr_cpus;
1865 }
1866
1867 void smp_mpic_setup_cpu(int cpu)
1868 {
1869         mpic_setup_this_cpu();
1870 }
1871
1872 void mpic_reset_core(int cpu)
1873 {
1874         struct mpic *mpic = mpic_primary;
1875         u32 pir;
1876         int cpuid = get_hard_smp_processor_id(cpu);
1877         int i;
1878
1879         /* Set target bit for core reset */
1880         pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1881         pir |= (1 << cpuid);
1882         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1883         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1884
1885         /* Restore target bit after reset complete */
1886         pir &= ~(1 << cpuid);
1887         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1888         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1889
1890         /* Perform 15 EOI on each reset core to clear pending interrupts.
1891          * This is required for FSL CoreNet based devices */
1892         if (mpic->flags & MPIC_FSL) {
1893                 for (i = 0; i < 15; i++) {
1894                         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid],
1895                                       MPIC_CPU_EOI, 0);
1896                 }
1897         }
1898 }
1899 #endif /* CONFIG_SMP */
1900
1901 #ifdef CONFIG_PM
1902 static void mpic_suspend_one(struct mpic *mpic)
1903 {
1904         int i;
1905
1906         for (i = 0; i < mpic->num_sources; i++) {
1907                 mpic->save_data[i].vecprio =
1908                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1909                 mpic->save_data[i].dest =
1910                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1911         }
1912 }
1913
1914 static int mpic_suspend(void)
1915 {
1916         struct mpic *mpic = mpics;
1917
1918         while (mpic) {
1919                 mpic_suspend_one(mpic);
1920                 mpic = mpic->next;
1921         }
1922
1923         return 0;
1924 }
1925
1926 static void mpic_resume_one(struct mpic *mpic)
1927 {
1928         int i;
1929
1930         for (i = 0; i < mpic->num_sources; i++) {
1931                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1932                                mpic->save_data[i].vecprio);
1933                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1934                                mpic->save_data[i].dest);
1935
1936 #ifdef CONFIG_MPIC_U3_HT_IRQS
1937         if (mpic->fixups) {
1938                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1939
1940                 if (fixup->base) {
1941                         /* we use the lowest bit in an inverted meaning */
1942                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1943                                 continue;
1944
1945                         /* Enable and configure */
1946                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1947
1948                         writel(mpic->save_data[i].fixup_data & ~1,
1949                                fixup->base + 4);
1950                 }
1951         }
1952 #endif
1953         } /* end for loop */
1954 }
1955
1956 static void mpic_resume(void)
1957 {
1958         struct mpic *mpic = mpics;
1959
1960         while (mpic) {
1961                 mpic_resume_one(mpic);
1962                 mpic = mpic->next;
1963         }
1964 }
1965
1966 static struct syscore_ops mpic_syscore_ops = {
1967         .resume = mpic_resume,
1968         .suspend = mpic_suspend,
1969 };
1970
1971 static int mpic_init_sys(void)
1972 {
1973         register_syscore_ops(&mpic_syscore_ops);
1974         return 0;
1975 }
1976
1977 device_initcall(mpic_init_sys);
1978 #endif