git.oblomov.eu Git - linux-2.6/blob - 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  *
  10  *  This file is subject to the terms and conditions of the GNU General Public
  11  *  License.  See the file COPYING in the main directory of this archive
  12  *  for more details.
  13  */
  14
  15 #undef DEBUG
  16 #undef DEBUG_IPI
  17 #undef DEBUG_IRQ
  18 #undef DEBUG_LOW
  19
  20 #include <linux/types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/irq.h>
  24 #include <linux/smp.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/bootmem.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/pci.h>
  29
  30 #include <asm/ptrace.h>
  31 #include <asm/signal.h>
  32 #include <asm/io.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/irq.h>
  35 #include <asm/machdep.h>
  36 #include <asm/mpic.h>
  37 #include <asm/smp.h>
  38
  39 #ifdef DEBUG
  40 #define DBG(fmt...) printk(fmt)
  41 #else
  42 #define DBG(fmt...)
  43 #endif
  44
  45 static struct mpic *mpics;
  46 static struct mpic *mpic_primary;
  47 static DEFINE_SPINLOCK(mpic_lock);
  48
  49 #ifdef CONFIG_PPC32     /* XXX for now */
  50 #ifdef CONFIG_IRQ_ALL_CPUS
  51 #define distribute_irqs (1)
  52 #else
  53 #define distribute_irqs (0)
  54 #endif
  55 #endif
  56
  57 #ifdef CONFIG_MPIC_WEIRD
  58 static u32 mpic_infos[][MPIC_IDX_END] = {
  59         [0] = { /* Original OpenPIC compatible MPIC */
  60                 MPIC_GREG_BASE,
  61                 MPIC_GREG_FEATURE_0,
  62                 MPIC_GREG_GLOBAL_CONF_0,
  63                 MPIC_GREG_VENDOR_ID,
  64                 MPIC_GREG_IPI_VECTOR_PRI_0,
  65                 MPIC_GREG_IPI_STRIDE,
  66                 MPIC_GREG_SPURIOUS,
  67                 MPIC_GREG_TIMER_FREQ,
  68
  69                 MPIC_TIMER_BASE,
  70                 MPIC_TIMER_STRIDE,
  71                 MPIC_TIMER_CURRENT_CNT,
  72                 MPIC_TIMER_BASE_CNT,
  73                 MPIC_TIMER_VECTOR_PRI,
  74                 MPIC_TIMER_DESTINATION,
  75
  76                 MPIC_CPU_BASE,
  77                 MPIC_CPU_STRIDE,
  78                 MPIC_CPU_IPI_DISPATCH_0,
  79                 MPIC_CPU_IPI_DISPATCH_STRIDE,
  80                 MPIC_CPU_CURRENT_TASK_PRI,
  81                 MPIC_CPU_WHOAMI,
  82                 MPIC_CPU_INTACK,
  83                 MPIC_CPU_EOI,
  84
  85                 MPIC_IRQ_BASE,
  86                 MPIC_IRQ_STRIDE,
  87                 MPIC_IRQ_VECTOR_PRI,
  88                 MPIC_VECPRI_VECTOR_MASK,
  89                 MPIC_VECPRI_POLARITY_POSITIVE,
  90                 MPIC_VECPRI_POLARITY_NEGATIVE,
  91                 MPIC_VECPRI_SENSE_LEVEL,
  92                 MPIC_VECPRI_SENSE_EDGE,
  93                 MPIC_VECPRI_POLARITY_MASK,
  94                 MPIC_VECPRI_SENSE_MASK,
  95                 MPIC_IRQ_DESTINATION
  96         },
  97         [1] = { /* Tsi108/109 PIC */
  98                 TSI108_GREG_BASE,
  99                 TSI108_GREG_FEATURE_0,
 100                 TSI108_GREG_GLOBAL_CONF_0,
 101                 TSI108_GREG_VENDOR_ID,
 102                 TSI108_GREG_IPI_VECTOR_PRI_0,
 103                 TSI108_GREG_IPI_STRIDE,
 104                 TSI108_GREG_SPURIOUS,
 105                 TSI108_GREG_TIMER_FREQ,
 106
 107                 TSI108_TIMER_BASE,
 108                 TSI108_TIMER_STRIDE,
 109                 TSI108_TIMER_CURRENT_CNT,
 110                 TSI108_TIMER_BASE_CNT,
 111                 TSI108_TIMER_VECTOR_PRI,
 112                 TSI108_TIMER_DESTINATION,
 113
 114                 TSI108_CPU_BASE,
 115                 TSI108_CPU_STRIDE,
 116                 TSI108_CPU_IPI_DISPATCH_0,
 117                 TSI108_CPU_IPI_DISPATCH_STRIDE,
 118                 TSI108_CPU_CURRENT_TASK_PRI,
 119                 TSI108_CPU_WHOAMI,
 120                 TSI108_CPU_INTACK,
 121                 TSI108_CPU_EOI,
 122
 123                 TSI108_IRQ_BASE,
 124                 TSI108_IRQ_STRIDE,
 125                 TSI108_IRQ_VECTOR_PRI,
 126                 TSI108_VECPRI_VECTOR_MASK,
 127                 TSI108_VECPRI_POLARITY_POSITIVE,
 128                 TSI108_VECPRI_POLARITY_NEGATIVE,
 129                 TSI108_VECPRI_SENSE_LEVEL,
 130                 TSI108_VECPRI_SENSE_EDGE,
 131                 TSI108_VECPRI_POLARITY_MASK,
 132                 TSI108_VECPRI_SENSE_MASK,
 133                 TSI108_IRQ_DESTINATION
 134         },
 135 };
 136
 137 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
 138
 139 #else /* CONFIG_MPIC_WEIRD */
 140
 141 #define MPIC_INFO(name) MPIC_##name
 142
 143 #endif /* CONFIG_MPIC_WEIRD */
 144
 145 /*
 146  * Register accessor functions
 147  */
 148
 149
 150 static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
 151                             unsigned int reg)
 152 {
 153         if (be)
 154                 return in_be32(base + (reg >> 2));
 155         else
 156                 return in_le32(base + (reg >> 2));
 157 }
 158
 159 static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
 160                               unsigned int reg, u32 value)
 161 {
 162         if (be)
 163                 out_be32(base + (reg >> 2), value);
 164         else
 165                 out_le32(base + (reg >> 2), value);
 166 }
 167
 168 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
 169 {
 170         unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
 171         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 172                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 173
 174         if (mpic->flags & MPIC_BROKEN_IPI)
 175                 be = !be;
 176         return _mpic_read(be, mpic->gregs, offset);
 177 }
 178
 179 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
 180 {
 181         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 182                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 183
 184         _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
 185 }
 186
 187 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
 188 {
 189         unsigned int cpu = 0;
 190
 191         if (mpic->flags & MPIC_PRIMARY)
 192                 cpu = hard_smp_processor_id();
 193         return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,
 194                           mpic->cpuregs[cpu], reg);
 195 }
 196
 197 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
 198 {
 199         unsigned int cpu = 0;
 200
 201         if (mpic->flags & MPIC_PRIMARY)
 202                 cpu = hard_smp_processor_id();
 203
 204         _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
 205 }
 206
 207 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
 208 {
 209         unsigned int    isu = src_no >> mpic->isu_shift;
 210         unsigned int    idx = src_no & mpic->isu_mask;
 211
 212         return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
 213                           reg + (idx * MPIC_INFO(IRQ_STRIDE)));
 214 }
 215
 216 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
 217                                    unsigned int reg, u32 value)
 218 {
 219         unsigned int    isu = src_no >> mpic->isu_shift;
 220         unsigned int    idx = src_no & mpic->isu_mask;
 221
 222         _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
 223                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
 224 }
 225
 226 #define mpic_read(b,r)          _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
 227 #define mpic_write(b,r,v)       _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
 228 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
 229 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
 230 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
 231 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
 232 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
 233 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
 234
 235
 236 /*
 237  * Low level utility functions
 238  */
 239
 240
 241
 242 /* Check if we have one of those nice broken MPICs with a flipped endian on
 243  * reads from IPI registers
 244  */
 245 static void __init mpic_test_broken_ipi(struct mpic *mpic)
 246 {
 247         u32 r;
 248
 249         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
 250         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
 251
 252         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
 253                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
 254                 mpic->flags |= MPIC_BROKEN_IPI;
 255         }
 256 }
 257
 258 #ifdef CONFIG_MPIC_BROKEN_U3
 259
 260 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
 261  * to force the edge setting on the MPIC and do the ack workaround.
 262  */
 263 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 264 {
 265         if (source >= 128 || !mpic->fixups)
 266                 return 0;
 267         return mpic->fixups[source].base != NULL;
 268 }
 269
 270
 271 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
 272 {
 273         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 274
 275         if (fixup->applebase) {
 276                 unsigned int soff = (fixup->index >> 3) & ~3;
 277                 unsigned int mask = 1U << (fixup->index & 0x1f);
 278                 writel(mask, fixup->applebase + soff);
 279         } else {
 280                 spin_lock(&mpic->fixup_lock);
 281                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
 282                 writel(fixup->data, fixup->base + 4);
 283                 spin_unlock(&mpic->fixup_lock);
 284         }
 285 }
 286
 287 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
 288                                       unsigned int irqflags)
 289 {
 290         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 291         unsigned long flags;
 292         u32 tmp;
 293
 294         if (fixup->base == NULL)
 295                 return;
 296
 297         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
 298             source, irqflags, fixup->index);
 299         spin_lock_irqsave(&mpic->fixup_lock, flags);
 300         /* Enable and configure */
 301         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 302         tmp = readl(fixup->base + 4);
 303         tmp &= ~(0x23U);
 304         if (irqflags & IRQ_LEVEL)
 305                 tmp |= 0x22;
 306         writel(tmp, fixup->base + 4);
 307         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 308 }
 309
 310 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
 311                                        unsigned int irqflags)
 312 {
 313         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 314         unsigned long flags;
 315         u32 tmp;
 316
 317         if (fixup->base == NULL)
 318                 return;
 319
 320         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
 321
 322         /* Disable */
 323         spin_lock_irqsave(&mpic->fixup_lock, flags);
 324         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 325         tmp = readl(fixup->base + 4);
 326         tmp |= 1;
 327         writel(tmp, fixup->base + 4);
 328         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 329 }
 330
 331 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
 332                                     unsigned int devfn, u32 vdid)
 333 {
 334         int i, irq, n;
 335         u8 __iomem *base;
 336         u32 tmp;
 337         u8 pos;
 338
 339         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 340              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 341                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 342                 if (id == PCI_CAP_ID_HT) {
 343                         id = readb(devbase + pos + 3);
 344                         if (id == HT_CAPTYPE_IRQ)
 345                                 break;
 346                 }
 347         }
 348         if (pos == 0)
 349                 return;
 350
 351         base = devbase + pos;
 352         writeb(0x01, base + 2);
 353         n = (readl(base + 4) >> 16) & 0xff;
 354
 355         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
 356                " has %d irqs\n",
 357                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 358
 359         for (i = 0; i <= n; i++) {
 360                 writeb(0x10 + 2 * i, base + 2);
 361                 tmp = readl(base + 4);
 362                 irq = (tmp >> 16) & 0xff;
 363                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
 364                 /* mask it , will be unmasked later */
 365                 tmp |= 0x1;
 366                 writel(tmp, base + 4);
 367                 mpic->fixups[irq].index = i;
 368                 mpic->fixups[irq].base = base;
 369                 /* Apple HT PIC has a non-standard way of doing EOIs */
 370                 if ((vdid & 0xffff) == 0x106b)
 371                         mpic->fixups[irq].applebase = devbase + 0x60;
 372                 else
 373                         mpic->fixups[irq].applebase = NULL;
 374                 writeb(0x11 + 2 * i, base + 2);
 375                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 376         }
 377 }
 378
 379
 380 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 381 {
 382         unsigned int devfn;
 383         u8 __iomem *cfgspace;
 384
 385         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 386
 387         /* Allocate fixups array */
 388         mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
 389         BUG_ON(mpic->fixups == NULL);
 390         memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
 391
 392         /* Init spinlock */
 393         spin_lock_init(&mpic->fixup_lock);
 394
 395         /* Map U3 config space. We assume all IO-APICs are on the primary bus
 396          * so we only need to map 64kB.
 397          */
 398         cfgspace = ioremap(0xf2000000, 0x10000);
 399         BUG_ON(cfgspace == NULL);
 400
 401         /* Now we scan all slots. We do a very quick scan, we read the header
 402          * type, vendor ID and device ID only, that's plenty enough
 403          */
 404         for (devfn = 0; devfn < 0x100; devfn++) {
 405                 u8 __iomem *devbase = cfgspace + (devfn << 8);
 406                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 407                 u32 l = readl(devbase + PCI_VENDOR_ID);
 408                 u16 s;
 409
 410                 DBG("devfn %x, l: %x\n", devfn, l);
 411
 412                 /* If no device, skip */
 413                 if (l == 0xffffffff || l == 0x00000000 ||
 414                     l == 0x0000ffff || l == 0xffff0000)
 415                         goto next;
 416                 /* Check if is supports capability lists */
 417                 s = readw(devbase + PCI_STATUS);
 418                 if (!(s & PCI_STATUS_CAP_LIST))
 419                         goto next;
 420
 421                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
 422
 423         next:
 424                 /* next device, if function 0 */
 425                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
 426                         devfn += 7;
 427         }
 428 }
 429
 430 #else /* CONFIG_MPIC_BROKEN_U3 */
 431
 432 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 433 {
 434         return 0;
 435 }
 436
 437 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 438 {
 439 }
 440
 441 #endif /* CONFIG_MPIC_BROKEN_U3 */
 442
 443
 444 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 445
 446 /* Find an mpic associated with a given linux interrupt */
 447 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
 448 {
 449         unsigned int src = mpic_irq_to_hw(irq);
 450
 451         if (irq < NUM_ISA_INTERRUPTS)
 452                 return NULL;
 453         if (is_ipi)
 454                 *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3);
 455
 456         return irq_desc[irq].chip_data;
 457 }
 458
 459 /* Convert a cpu mask from logical to physical cpu numbers. */
 460 static inline u32 mpic_physmask(u32 cpumask)
 461 {
 462         int i;
 463         u32 mask = 0;
 464
 465         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
 466                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 467         return mask;
 468 }
 469
 470 #ifdef CONFIG_SMP
 471 /* Get the mpic structure from the IPI number */
 472 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 473 {
 474         return irq_desc[ipi].chip_data;
 475 }
 476 #endif
 477
 478 /* Get the mpic structure from the irq number */
 479 static inline struct mpic * mpic_from_irq(unsigned int irq)
 480 {
 481         return irq_desc[irq].chip_data;
 482 }
 483
 484 /* Send an EOI */
 485 static inline void mpic_eoi(struct mpic *mpic)
 486 {
 487         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 488         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 489 }
 490
 491 #ifdef CONFIG_SMP
 492 static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
 493 {
 494         smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs);
 495         return IRQ_HANDLED;
 496 }
 497 #endif /* CONFIG_SMP */
 498
 499 /*
 500  * Linux descriptor level callbacks
 501  */
 502
 503
 504 static void mpic_unmask_irq(unsigned int irq)
 505 {
 506         unsigned int loops = 100000;
 507         struct mpic *mpic = mpic_from_irq(irq);
 508         unsigned int src = mpic_irq_to_hw(irq);
 509
 510         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 511
 512         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 513                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 514                        ~MPIC_VECPRI_MASK);
 515         /* make sure mask gets to controller before we return to user */
 516         do {
 517                 if (!loops--) {
 518                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 519                         break;
 520                 }
 521         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 522 }
 523
 524 static void mpic_mask_irq(unsigned int irq)
 525 {
 526         unsigned int loops = 100000;
 527         struct mpic *mpic = mpic_from_irq(irq);
 528         unsigned int src = mpic_irq_to_hw(irq);
 529
 530         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 531
 532         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 533                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 534                        MPIC_VECPRI_MASK);
 535
 536         /* make sure mask gets to controller before we return to user */
 537         do {
 538                 if (!loops--) {
 539                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 540                         break;
 541                 }
 542         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 543 }
 544
 545 static void mpic_end_irq(unsigned int irq)
 546 {
 547         struct mpic *mpic = mpic_from_irq(irq);
 548
 549 #ifdef DEBUG_IRQ
 550         DBG("%s: end_irq: %d\n", mpic->name, irq);
 551 #endif
 552         /* We always EOI on end_irq() even for edge interrupts since that
 553          * should only lower the priority, the MPIC should have properly
 554          * latched another edge interrupt coming in anyway
 555          */
 556
 557         mpic_eoi(mpic);
 558 }
 559
 560 #ifdef CONFIG_MPIC_BROKEN_U3
 561
 562 static void mpic_unmask_ht_irq(unsigned int irq)
 563 {
 564         struct mpic *mpic = mpic_from_irq(irq);
 565         unsigned int src = mpic_irq_to_hw(irq);
 566
 567         mpic_unmask_irq(irq);
 568
 569         if (irq_desc[irq].status & IRQ_LEVEL)
 570                 mpic_ht_end_irq(mpic, src);
 571 }
 572
 573 static unsigned int mpic_startup_ht_irq(unsigned int irq)
 574 {
 575         struct mpic *mpic = mpic_from_irq(irq);
 576         unsigned int src = mpic_irq_to_hw(irq);
 577
 578         mpic_unmask_irq(irq);
 579         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
 580
 581         return 0;
 582 }
 583
 584 static void mpic_shutdown_ht_irq(unsigned int irq)
 585 {
 586         struct mpic *mpic = mpic_from_irq(irq);
 587         unsigned int src = mpic_irq_to_hw(irq);
 588
 589         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
 590         mpic_mask_irq(irq);
 591 }
 592
 593 static void mpic_end_ht_irq(unsigned int irq)
 594 {
 595         struct mpic *mpic = mpic_from_irq(irq);
 596         unsigned int src = mpic_irq_to_hw(irq);
 597
 598 #ifdef DEBUG_IRQ
 599         DBG("%s: end_irq: %d\n", mpic->name, irq);
 600 #endif
 601         /* We always EOI on end_irq() even for edge interrupts since that
 602          * should only lower the priority, the MPIC should have properly
 603          * latched another edge interrupt coming in anyway
 604          */
 605
 606         if (irq_desc[irq].status & IRQ_LEVEL)
 607                 mpic_ht_end_irq(mpic, src);
 608         mpic_eoi(mpic);
 609 }
 610 #endif /* !CONFIG_MPIC_BROKEN_U3 */
 611
 612 #ifdef CONFIG_SMP
 613
 614 static void mpic_unmask_ipi(unsigned int irq)
 615 {
 616         struct mpic *mpic = mpic_from_ipi(irq);
 617         unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0;
 618
 619         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
 620         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 621 }
 622
 623 static void mpic_mask_ipi(unsigned int irq)
 624 {
 625         /* NEVER disable an IPI... that's just plain wrong! */
 626 }
 627
 628 static void mpic_end_ipi(unsigned int irq)
 629 {
 630         struct mpic *mpic = mpic_from_ipi(irq);
 631
 632         /*
 633          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 634          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 635          * applying to them. We EOI them late to avoid re-entering.
 636          * We mark IPI's with IRQF_DISABLED as they must run with
 637          * irqs disabled.
 638          */
 639         mpic_eoi(mpic);
 640 }
 641
 642 #endif /* CONFIG_SMP */
 643
 644 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
 645 {
 646         struct mpic *mpic = mpic_from_irq(irq);
 647         unsigned int src = mpic_irq_to_hw(irq);
 648
 649         cpumask_t tmp;
 650
 651         cpus_and(tmp, cpumask, cpu_online_map);
 652
 653         mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 654                        mpic_physmask(cpus_addr(tmp)[0]));
 655 }
 656
 657 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 658 {
 659         /* Now convert sense value */
 660         switch(type & IRQ_TYPE_SENSE_MASK) {
 661         case IRQ_TYPE_EDGE_RISING:
 662                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 663                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 664         case IRQ_TYPE_EDGE_FALLING:
 665         case IRQ_TYPE_EDGE_BOTH:
 666                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 667                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 668         case IRQ_TYPE_LEVEL_HIGH:
 669                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 670                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 671         case IRQ_TYPE_LEVEL_LOW:
 672         default:
 673                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 674                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 675         }
 676 }
 677
 678 static int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
 679 {
 680         struct mpic *mpic = mpic_from_irq(virq);
 681         unsigned int src = mpic_irq_to_hw(virq);
 682         struct irq_desc *desc = get_irq_desc(virq);
 683         unsigned int vecpri, vold, vnew;
 684
 685         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 686             mpic, virq, src, flow_type);
 687
 688         if (src >= mpic->irq_count)
 689                 return -EINVAL;
 690
 691         if (flow_type == IRQ_TYPE_NONE)
 692                 if (mpic->senses && src < mpic->senses_count)
 693                         flow_type = mpic->senses[src];
 694         if (flow_type == IRQ_TYPE_NONE)
 695                 flow_type = IRQ_TYPE_LEVEL_LOW;
 696
 697         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 698         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 699         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 700                 desc->status |= IRQ_LEVEL;
 701
 702         if (mpic_is_ht_interrupt(mpic, src))
 703                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 704                         MPIC_VECPRI_SENSE_EDGE;
 705         else
 706                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 707
 708         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 709         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 710                         MPIC_INFO(VECPRI_SENSE_MASK));
 711         vnew |= vecpri;
 712         if (vold != vnew)
 713                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 714
 715         return 0;
 716 }
 717
 718 static struct irq_chip mpic_irq_chip = {
 719         .mask           = mpic_mask_irq,
 720         .unmask         = mpic_unmask_irq,
 721         .eoi            = mpic_end_irq,
 722         .set_type       = mpic_set_irq_type,
 723 };
 724
 725 #ifdef CONFIG_SMP
 726 static struct irq_chip mpic_ipi_chip = {
 727         .mask           = mpic_mask_ipi,
 728         .unmask         = mpic_unmask_ipi,
 729         .eoi            = mpic_end_ipi,
 730 };
 731 #endif /* CONFIG_SMP */
 732
 733 #ifdef CONFIG_MPIC_BROKEN_U3
 734 static struct irq_chip mpic_irq_ht_chip = {
 735         .startup        = mpic_startup_ht_irq,
 736         .shutdown       = mpic_shutdown_ht_irq,
 737         .mask           = mpic_mask_irq,
 738         .unmask         = mpic_unmask_ht_irq,
 739         .eoi            = mpic_end_ht_irq,
 740         .set_type       = mpic_set_irq_type,
 741 };
 742 #endif /* CONFIG_MPIC_BROKEN_U3 */
 743
 744
 745 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 746 {
 747         struct mpic *mpic = h->host_data;
 748
 749         /* Exact match, unless mpic node is NULL */
 750         return mpic->of_node == NULL || mpic->of_node == node;
 751 }
 752
 753 static int mpic_host_map(struct irq_host *h, unsigned int virq,
 754                          irq_hw_number_t hw)
 755 {
 756         struct mpic *mpic = h->host_data;
 757         struct irq_chip *chip;
 758
 759         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
 760
 761         if (hw == MPIC_VEC_SPURRIOUS)
 762                 return -EINVAL;
 763
 764 #ifdef CONFIG_SMP
 765         else if (hw >= MPIC_VEC_IPI_0) {
 766                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
 767
 768                 DBG("mpic: mapping as IPI\n");
 769                 set_irq_chip_data(virq, mpic);
 770                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
 771                                          handle_percpu_irq);
 772                 return 0;
 773         }
 774 #endif /* CONFIG_SMP */
 775
 776         if (hw >= mpic->irq_count)
 777                 return -EINVAL;
 778
 779         /* Default chip */
 780         chip = &mpic->hc_irq;
 781
 782 #ifdef CONFIG_MPIC_BROKEN_U3
 783         /* Check for HT interrupts, override vecpri */
 784         if (mpic_is_ht_interrupt(mpic, hw))
 785                 chip = &mpic->hc_ht_irq;
 786 #endif /* CONFIG_MPIC_BROKEN_U3 */
 787
 788         DBG("mpic: mapping to irq chip @%p\n", chip);
 789
 790         set_irq_chip_data(virq, mpic);
 791         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
 792
 793         /* Set default irq type */
 794         set_irq_type(virq, IRQ_TYPE_NONE);
 795
 796         return 0;
 797 }
 798
 799 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
 800                            u32 *intspec, unsigned int intsize,
 801                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 802
 803 {
 804         static unsigned char map_mpic_senses[4] = {
 805                 IRQ_TYPE_EDGE_RISING,
 806                 IRQ_TYPE_LEVEL_LOW,
 807                 IRQ_TYPE_LEVEL_HIGH,
 808                 IRQ_TYPE_EDGE_FALLING,
 809         };
 810
 811         *out_hwirq = intspec[0];
 812         if (intsize > 1) {
 813                 u32 mask = 0x3;
 814
 815                 /* Apple invented a new race of encoding on machines with
 816                  * an HT APIC. They encode, among others, the index within
 817                  * the HT APIC. We don't care about it here since thankfully,
 818                  * it appears that they have the APIC already properly
 819                  * configured, and thus our current fixup code that reads the
 820                  * APIC config works fine. However, we still need to mask out
 821                  * bits in the specifier to make sure we only get bit 0 which
 822                  * is the level/edge bit (the only sense bit exposed by Apple),
 823                  * as their bit 1 means something else.
 824                  */
 825                 if (machine_is(powermac))
 826                         mask = 0x1;
 827                 *out_flags = map_mpic_senses[intspec[1] & mask];
 828         } else
 829                 *out_flags = IRQ_TYPE_NONE;
 830
 831         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
 832             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
 833
 834         return 0;
 835 }
 836
 837 static struct irq_host_ops mpic_host_ops = {
 838         .match = mpic_host_match,
 839         .map = mpic_host_map,
 840         .xlate = mpic_host_xlate,
 841 };
 842
 843 /*
 844  * Exported functions
 845  */
 846
 847 struct mpic * __init mpic_alloc(struct device_node *node,
 848                                 unsigned long phys_addr,
 849                                 unsigned int flags,
 850                                 unsigned int isu_size,
 851                                 unsigned int irq_count,
 852                                 const char *name)
 853 {
 854         struct mpic     *mpic;
 855         u32             reg;
 856         const char      *vers;
 857         int             i;
 858
 859         mpic = alloc_bootmem(sizeof(struct mpic));
 860         if (mpic == NULL)
 861                 return NULL;
 862
 863         memset(mpic, 0, sizeof(struct mpic));
 864         mpic->name = name;
 865         mpic->of_node = node ? of_node_get(node) : NULL;
 866
 867         mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256,
 868                                        &mpic_host_ops,
 869                                        MPIC_VEC_SPURRIOUS);
 870         if (mpic->irqhost == NULL) {
 871                 of_node_put(node);
 872                 return NULL;
 873         }
 874
 875         mpic->irqhost->host_data = mpic;
 876         mpic->hc_irq = mpic_irq_chip;
 877         mpic->hc_irq.typename = name;
 878         if (flags & MPIC_PRIMARY)
 879                 mpic->hc_irq.set_affinity = mpic_set_affinity;
 880 #ifdef CONFIG_MPIC_BROKEN_U3
 881         mpic->hc_ht_irq = mpic_irq_ht_chip;
 882         mpic->hc_ht_irq.typename = name;
 883         if (flags & MPIC_PRIMARY)
 884                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
 885 #endif /* CONFIG_MPIC_BROKEN_U3 */
 886 #ifdef CONFIG_SMP
 887         mpic->hc_ipi = mpic_ipi_chip;
 888         mpic->hc_ipi.typename = name;
 889 #endif /* CONFIG_SMP */
 890
 891         mpic->flags = flags;
 892         mpic->isu_size = isu_size;
 893         mpic->irq_count = irq_count;
 894         mpic->num_sources = 0; /* so far */
 895
 896 #ifdef CONFIG_MPIC_WEIRD
 897         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
 898 #endif
 899
 900         /* Map the global registers */
 901         mpic->gregs = ioremap(phys_addr + MPIC_INFO(GREG_BASE), 0x1000);
 902         mpic->tmregs = mpic->gregs +
 903                        ((MPIC_INFO(TIMER_BASE) - MPIC_INFO(GREG_BASE)) >> 2);
 904         BUG_ON(mpic->gregs == NULL);
 905
 906         /* Reset */
 907         if (flags & MPIC_WANTS_RESET) {
 908                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
 909                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
 910                            | MPIC_GREG_GCONF_RESET);
 911                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
 912                        & MPIC_GREG_GCONF_RESET)
 913                         mb();
 914         }
 915
 916         /* Read feature register, calculate num CPUs and, for non-ISU
 917          * MPICs, num sources as well. On ISU MPICs, sources are counted
 918          * as ISUs are added
 919          */
 920         reg = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
 921         mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
 922                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
 923         if (isu_size == 0)
 924                 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
 925                                      >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
 926
 927         /* Map the per-CPU registers */
 928         for (i = 0; i < mpic->num_cpus; i++) {
 929                 mpic->cpuregs[i] = ioremap(phys_addr + MPIC_INFO(CPU_BASE) +
 930                                            i * MPIC_INFO(CPU_STRIDE), 0x1000);
 931                 BUG_ON(mpic->cpuregs[i] == NULL);
 932         }
 933
 934         /* Initialize main ISU if none provided */
 935         if (mpic->isu_size == 0) {
 936                 mpic->isu_size = mpic->num_sources;
 937                 mpic->isus[0] = ioremap(phys_addr + MPIC_INFO(IRQ_BASE),
 938                                         MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
 939                 BUG_ON(mpic->isus[0] == NULL);
 940         }
 941         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
 942         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
 943
 944         /* Display version */
 945         switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
 946         case 1:
 947                 vers = "1.0";
 948                 break;
 949         case 2:
 950                 vers = "1.2";
 951                 break;
 952         case 3:
 953                 vers = "1.3";
 954                 break;
 955         default:
 956                 vers = "<unknown>";
 957                 break;
 958         }
 959         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
 960                name, vers, phys_addr, mpic->num_cpus);
 961         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
 962                mpic->isu_shift, mpic->isu_mask);
 963
 964         mpic->next = mpics;
 965         mpics = mpic;
 966
 967         if (flags & MPIC_PRIMARY) {
 968                 mpic_primary = mpic;
 969                 irq_set_default_host(mpic->irqhost);
 970         }
 971
 972         return mpic;
 973 }
 974
 975 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
 976                             unsigned long phys_addr)
 977 {
 978         unsigned int isu_first = isu_num * mpic->isu_size;
 979
 980         BUG_ON(isu_num >= MPIC_MAX_ISU);
 981
 982         mpic->isus[isu_num] = ioremap(phys_addr,
 983                                       MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
 984         if ((isu_first + mpic->isu_size) > mpic->num_sources)
 985                 mpic->num_sources = isu_first + mpic->isu_size;
 986 }
 987
 988 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
 989 {
 990         mpic->senses = senses;
 991         mpic->senses_count = count;
 992 }
 993
 994 void __init mpic_init(struct mpic *mpic)
 995 {
 996         int i;
 997
 998         BUG_ON(mpic->num_sources == 0);
 999         WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0);
1000
1001         /* Sanitize source count */
1002         if (mpic->num_sources > MPIC_VEC_IPI_0)
1003                 mpic->num_sources = MPIC_VEC_IPI_0;
1004
1005         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1006
1007         /* Set current processor priority to max */
1008         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1009
1010         /* Initialize timers: just disable them all */
1011         for (i = 0; i < 4; i++) {
1012                 mpic_write(mpic->tmregs,
1013                            i * MPIC_INFO(TIMER_STRIDE) +
1014                            MPIC_INFO(TIMER_DESTINATION), 0);
1015                 mpic_write(mpic->tmregs,
1016                            i * MPIC_INFO(TIMER_STRIDE) +
1017                            MPIC_INFO(TIMER_VECTOR_PRI),
1018                            MPIC_VECPRI_MASK |
1019                            (MPIC_VEC_TIMER_0 + i));
1020         }
1021
1022         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1023         mpic_test_broken_ipi(mpic);
1024         for (i = 0; i < 4; i++) {
1025                 mpic_ipi_write(i,
1026                                MPIC_VECPRI_MASK |
1027                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1028                                (MPIC_VEC_IPI_0 + i));
1029         }
1030
1031         /* Initialize interrupt sources */
1032         if (mpic->irq_count == 0)
1033                 mpic->irq_count = mpic->num_sources;
1034
1035         /* Do the HT PIC fixups on U3 broken mpic */
1036         DBG("MPIC flags: %x\n", mpic->flags);
1037         if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
1038                 mpic_scan_ht_pics(mpic);
1039
1040         for (i = 0; i < mpic->num_sources; i++) {
1041                 /* start with vector = source number, and masked */
1042                 u32 vecpri = MPIC_VECPRI_MASK | i |
1043                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1044
1045                 /* init hw */
1046                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1047                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1048                                1 << hard_smp_processor_id());
1049         }
1050
1051         /* Init spurrious vector */
1052         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), MPIC_VEC_SPURRIOUS);
1053
1054         /* Disable 8259 passthrough, if supported */
1055         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1056                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1057                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1058                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1059
1060         /* Set current processor priority to 0 */
1061         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1062 }
1063
1064 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1065 {
1066         u32 v;
1067
1068         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1069         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1070         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1071         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1072 }
1073
1074 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1075 {
1076         unsigned long flags;
1077         u32 v;
1078
1079         spin_lock_irqsave(&mpic_lock, flags);
1080         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1081         if (enable)
1082                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1083         else
1084                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1085         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1086         spin_unlock_irqrestore(&mpic_lock, flags);
1087 }
1088
1089 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1090 {
1091         int is_ipi;
1092         struct mpic *mpic = mpic_find(irq, &is_ipi);
1093         unsigned int src = mpic_irq_to_hw(irq);
1094         unsigned long flags;
1095         u32 reg;
1096
1097         spin_lock_irqsave(&mpic_lock, flags);
1098         if (is_ipi) {
1099                 reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) &
1100                         ~MPIC_VECPRI_PRIORITY_MASK;
1101                 mpic_ipi_write(src - MPIC_VEC_IPI_0,
1102                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1103         } else {
1104                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1105                         & ~MPIC_VECPRI_PRIORITY_MASK;
1106                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1107                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1108         }
1109         spin_unlock_irqrestore(&mpic_lock, flags);
1110 }
1111
1112 unsigned int mpic_irq_get_priority(unsigned int irq)
1113 {
1114         int is_ipi;
1115         struct mpic *mpic = mpic_find(irq, &is_ipi);
1116         unsigned int src = mpic_irq_to_hw(irq);
1117         unsigned long flags;
1118         u32 reg;
1119
1120         spin_lock_irqsave(&mpic_lock, flags);
1121         if (is_ipi)
1122                 reg = mpic_ipi_read(src = MPIC_VEC_IPI_0);
1123         else
1124                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
1125         spin_unlock_irqrestore(&mpic_lock, flags);
1126         return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
1127 }
1128
1129 void mpic_setup_this_cpu(void)
1130 {
1131 #ifdef CONFIG_SMP
1132         struct mpic *mpic = mpic_primary;
1133         unsigned long flags;
1134         u32 msk = 1 << hard_smp_processor_id();
1135         unsigned int i;
1136
1137         BUG_ON(mpic == NULL);
1138
1139         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1140
1141         spin_lock_irqsave(&mpic_lock, flags);
1142
1143         /* let the mpic know we want intrs. default affinity is 0xffffffff
1144          * until changed via /proc. That's how it's done on x86. If we want
1145          * it differently, then we should make sure we also change the default
1146          * values of irq_desc[].affinity in irq.c.
1147          */
1148         if (distribute_irqs) {
1149                 for (i = 0; i < mpic->num_sources ; i++)
1150                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1151                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1152         }
1153
1154         /* Set current processor priority to 0 */
1155         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1156
1157         spin_unlock_irqrestore(&mpic_lock, flags);
1158 #endif /* CONFIG_SMP */
1159 }
1160
1161 int mpic_cpu_get_priority(void)
1162 {
1163         struct mpic *mpic = mpic_primary;
1164
1165         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1166 }
1167
1168 void mpic_cpu_set_priority(int prio)
1169 {
1170         struct mpic *mpic = mpic_primary;
1171
1172         prio &= MPIC_CPU_TASKPRI_MASK;
1173         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1174 }
1175
1176 /*
1177  * XXX: someone who knows mpic should check this.
1178  * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
1179  * or can we reset the mpic in the new kernel?
1180  */
1181 void mpic_teardown_this_cpu(int secondary)
1182 {
1183         struct mpic *mpic = mpic_primary;
1184         unsigned long flags;
1185         u32 msk = 1 << hard_smp_processor_id();
1186         unsigned int i;
1187
1188         BUG_ON(mpic == NULL);
1189
1190         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1191         spin_lock_irqsave(&mpic_lock, flags);
1192
1193         /* let the mpic know we don't want intrs.  */
1194         for (i = 0; i < mpic->num_sources ; i++)
1195                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1196                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1197
1198         /* Set current processor priority to max */
1199         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1200
1201         spin_unlock_irqrestore(&mpic_lock, flags);
1202 }
1203
1204
1205 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1206 {
1207         struct mpic *mpic = mpic_primary;
1208
1209         BUG_ON(mpic == NULL);
1210
1211 #ifdef DEBUG_IPI
1212         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1213 #endif
1214
1215         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1216                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1217                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1218 }
1219
1220 unsigned int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
1221 {
1222         u32 src;
1223
1224         src = mpic_cpu_read(MPIC_INFO(CPU_INTACK)) & MPIC_INFO(VECPRI_VECTOR_MASK);
1225 #ifdef DEBUG_LOW
1226         DBG("%s: get_one_irq(): %d\n", mpic->name, src);
1227 #endif
1228         if (unlikely(src == MPIC_VEC_SPURRIOUS))
1229                 return NO_IRQ;
1230         return irq_linear_revmap(mpic->irqhost, src);
1231 }
1232
1233 unsigned int mpic_get_irq(struct pt_regs *regs)
1234 {
1235         struct mpic *mpic = mpic_primary;
1236
1237         BUG_ON(mpic == NULL);
1238
1239         return mpic_get_one_irq(mpic, regs);
1240 }
1241
1242
1243 #ifdef CONFIG_SMP
1244 void mpic_request_ipis(void)
1245 {
1246         struct mpic *mpic = mpic_primary;
1247         int i;
1248         static char *ipi_names[] = {
1249                 "IPI0 (call function)",
1250                 "IPI1 (reschedule)",
1251                 "IPI2 (unused)",
1252                 "IPI3 (debugger break)",
1253         };
1254         BUG_ON(mpic == NULL);
1255
1256         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1257
1258         for (i = 0; i < 4; i++) {
1259                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1260                                                        MPIC_VEC_IPI_0 + i);
1261                 if (vipi == NO_IRQ) {
1262                         printk(KERN_ERR "Failed to map IPI %d\n", i);
1263                         break;
1264                 }
1265                 request_irq(vipi, mpic_ipi_action, IRQF_DISABLED,
1266                             ipi_names[i], mpic);
1267         }
1268 }
1269
1270 void smp_mpic_message_pass(int target, int msg)
1271 {
1272         /* make sure we're sending something that translates to an IPI */
1273         if ((unsigned int)msg > 3) {
1274                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1275                        smp_processor_id(), msg);
1276                 return;
1277         }
1278         switch (target) {
1279         case MSG_ALL:
1280                 mpic_send_ipi(msg, 0xffffffff);
1281                 break;
1282         case MSG_ALL_BUT_SELF:
1283                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1284                 break;
1285         default:
1286                 mpic_send_ipi(msg, 1 << target);
1287                 break;
1288         }
1289 }
1290 #endif /* CONFIG_SMP */