arch/sparc64/kernel/irq.c

   1 /* $Id: irq.c,v 1.114 2002/01/11 08:45:38 davem Exp $
   2  * irq.c: UltraSparc IRQ handling/init/registry.
   3  *
   4  * Copyright (C) 1997  David S. Miller  (davem@caip.rutgers.edu)
   5  * Copyright (C) 1998  Eddie C. Dost    (ecd@skynet.be)
   6  * Copyright (C) 1998  Jakub Jelinek    (jj@ultra.linux.cz)
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11 #include <linux/sched.h>
  12 #include <linux/ptrace.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/signal.h>
  16 #include <linux/mm.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/slab.h>
  19 #include <linux/random.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/processor.h>
  27 #include <asm/atomic.h>
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31 #include <asm/sbus.h>
  32 #include <asm/iommu.h>
  33 #include <asm/upa.h>
  34 #include <asm/oplib.h>
  35 #include <asm/timer.h>
  36 #include <asm/smp.h>
  37 #include <asm/starfire.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/cache.h>
  40 #include <asm/cpudata.h>
  41 #include <asm/auxio.h>
  42
  43 #ifdef CONFIG_SMP
  44 static void distribute_irqs(void);
  45 #endif
  46
  47 /* UPA nodes send interrupt packet to UltraSparc with first data reg
  48  * value low 5 (7 on Starfire) bits holding the IRQ identifier being
  49  * delivered.  We must translate this into a non-vector IRQ so we can
  50  * set the softint on this cpu.
  51  *
  52  * To make processing these packets efficient and race free we use
  53  * an array of irq buckets below.  The interrupt vector handler in
  54  * entry.S feeds incoming packets into per-cpu pil-indexed lists.
  55  * The IVEC handler does not need to act atomically, the PIL dispatch
  56  * code uses CAS to get an atomic snapshot of the list and clear it
  57  * at the same time.
  58  */
  59
  60 struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
  61
  62 /* This has to be in the main kernel image, it cannot be
  63  * turned into per-cpu data.  The reason is that the main
  64  * kernel image is locked into the TLB and this structure
  65  * is accessed from the vectored interrupt trap handler.  If
  66  * access to this structure takes a TLB miss it could cause
  67  * the 5-level sparc v9 trap stack to overflow.
  68  */
  69 struct irq_work_struct {
  70         unsigned int    irq_worklists[16];
  71 };
  72 struct irq_work_struct __irq_work[NR_CPUS];
  73 #define irq_work(__cpu, __pil)  &(__irq_work[(__cpu)].irq_worklists[(__pil)])
  74
  75 static struct irqaction *irq_action[NR_IRQS+1];
  76
  77 /* This only synchronizes entities which modify IRQ handler
  78  * state and some selected user-level spots that want to
  79  * read things in the table.  IRQ handler processing orders
  80  * its' accesses such that no locking is needed.
  81  */
  82 static DEFINE_SPINLOCK(irq_action_lock);
  83
  84 static void register_irq_proc (unsigned int irq);
  85
  86 /*
  87  * Upper 2b of irqaction->flags holds the ino.
  88  * irqaction->mask holds the smp affinity information.
  89  */
  90 #define put_ino_in_irqaction(action, irq) \
  91         action->flags &= 0xffffffffffffUL; \
  92         if (__bucket(irq) == &pil0_dummy_bucket) \
  93                 action->flags |= 0xdeadUL << 48;  \
  94         else \
  95                 action->flags |= __irq_ino(irq) << 48;
  96 #define get_ino_in_irqaction(action)    (action->flags >> 48)
  97
  98 #define put_smpaff_in_irqaction(action, smpaff) (action)->mask = (smpaff)
  99 #define get_smpaff_in_irqaction(action)         ((action)->mask)
 100
 101 int show_interrupts(struct seq_file *p, void *v)
 102 {
 103         unsigned long flags;
 104         int i = *(loff_t *) v;
 105         struct irqaction *action;
 106 #ifdef CONFIG_SMP
 107         int j;
 108 #endif
 109
 110         spin_lock_irqsave(&irq_action_lock, flags);
 111         if (i <= NR_IRQS) {
 112                 if (!(action = *(i + irq_action)))
 113                         goto out_unlock;
 114                 seq_printf(p, "%3d: ", i);
 115 #ifndef CONFIG_SMP
 116                 seq_printf(p, "%10u ", kstat_irqs(i));
 117 #else
 118                 for (j = 0; j < NR_CPUS; j++) {
 119                         if (!cpu_online(j))
 120                                 continue;
 121                         seq_printf(p, "%10u ",
 122                                    kstat_cpu(j).irqs[i]);
 123                 }
 124 #endif
 125                 seq_printf(p, " %s:%lx", action->name,
 126                            get_ino_in_irqaction(action));
 127                 for (action = action->next; action; action = action->next) {
 128                         seq_printf(p, ", %s:%lx", action->name,
 129                                    get_ino_in_irqaction(action));
 130                 }
 131                 seq_putc(p, '\n');
 132         }
 133 out_unlock:
 134         spin_unlock_irqrestore(&irq_action_lock, flags);
 135
 136         return 0;
 137 }
 138
 139 /* Now these are always passed a true fully specified sun4u INO. */
 140 void enable_irq(unsigned int irq)
 141 {
 142         struct ino_bucket *bucket = __bucket(irq);
 143         unsigned long imap;
 144         unsigned long tid;
 145
 146         imap = bucket->imap;
 147         if (imap == 0UL)
 148                 return;
 149
 150         preempt_disable();
 151
 152         if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 153                 unsigned long ver;
 154
 155                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 156                 if ((ver >> 32) == 0x003e0016) {
 157                         /* We set it to our JBUS ID. */
 158                         __asm__ __volatile__("ldxa [%%g0] %1, %0"
 159                                              : "=r" (tid)
 160                                              : "i" (ASI_JBUS_CONFIG));
 161                         tid = ((tid & (0x1fUL<<17)) << 9);
 162                         tid &= IMAP_TID_JBUS;
 163                 } else {
 164                         /* We set it to our Safari AID. */
 165                         __asm__ __volatile__("ldxa [%%g0] %1, %0"
 166                                              : "=r" (tid)
 167                                              : "i" (ASI_SAFARI_CONFIG));
 168                         tid = ((tid & (0x3ffUL<<17)) << 9);
 169                         tid &= IMAP_AID_SAFARI;
 170                 }
 171         } else if (this_is_starfire == 0) {
 172                 /* We set it to our UPA MID. */
 173                 __asm__ __volatile__("ldxa [%%g0] %1, %0"
 174                                      : "=r" (tid)
 175                                      : "i" (ASI_UPA_CONFIG));
 176                 tid = ((tid & UPA_CONFIG_MID) << 9);
 177                 tid &= IMAP_TID_UPA;
 178         } else {
 179                 tid = (starfire_translate(imap, smp_processor_id()) << 26);
 180                 tid &= IMAP_TID_UPA;
 181         }
 182
 183         /* NOTE NOTE NOTE, IGN and INO are read-only, IGN is a product
 184          * of this SYSIO's preconfigured IGN in the SYSIO Control
 185          * Register, the hardware just mirrors that value here.
 186          * However for Graphics and UPA Slave devices the full
 187          * IMAP_INR field can be set by the programmer here.
 188          *
 189          * Things like FFB can now be handled via the new IRQ mechanism.
 190          */
 191         upa_writel(tid | IMAP_VALID, imap);
 192
 193         preempt_enable();
 194 }
 195
 196 /* This now gets passed true ino's as well. */
 197 void disable_irq(unsigned int irq)
 198 {
 199         struct ino_bucket *bucket = __bucket(irq);
 200         unsigned long imap;
 201
 202         imap = bucket->imap;
 203         if (imap != 0UL) {
 204                 u32 tmp;
 205
 206                 /* NOTE: We do not want to futz with the IRQ clear registers
 207                  *       and move the state to IDLE, the SCSI code does call
 208                  *       disable_irq() to assure atomicity in the queue cmd
 209                  *       SCSI adapter driver code.  Thus we'd lose interrupts.
 210                  */
 211                 tmp = upa_readl(imap);
 212                 tmp &= ~IMAP_VALID;
 213                 upa_writel(tmp, imap);
 214         }
 215 }
 216
 217 /* The timer is the one "weird" interrupt which is generated by
 218  * the CPU %tick register and not by some normal vectored interrupt
 219  * source.  To handle this special case, we use this dummy INO bucket.
 220  */
 221 static struct irq_desc pil0_dummy_desc;
 222 static struct ino_bucket pil0_dummy_bucket = {
 223         .irq_info       =       &pil0_dummy_desc,
 224 };
 225
 226 static void build_irq_error(const char *msg, unsigned int ino, int pil, int inofixup,
 227                             unsigned long iclr, unsigned long imap,
 228                             struct ino_bucket *bucket)
 229 {
 230         prom_printf("IRQ: INO %04x (%d:%016lx:%016lx) --> "
 231                     "(%d:%d:%016lx:%016lx), halting...\n",
 232                     ino, bucket->pil, bucket->iclr, bucket->imap,
 233                     pil, inofixup, iclr, imap);
 234         prom_halt();
 235 }
 236
 237 unsigned int build_irq(int pil, int inofixup, unsigned long iclr, unsigned long imap)
 238 {
 239         struct ino_bucket *bucket;
 240         int ino;
 241
 242         if (pil == 0) {
 243                 if (iclr != 0UL || imap != 0UL) {
 244                         prom_printf("Invalid dummy bucket for PIL0 (%lx:%lx)\n",
 245                                     iclr, imap);
 246                         prom_halt();
 247                 }
 248                 return __irq(&pil0_dummy_bucket);
 249         }
 250
 251         /* RULE: Both must be specified in all other cases. */
 252         if (iclr == 0UL || imap == 0UL) {
 253                 prom_printf("Invalid build_irq %d %d %016lx %016lx\n",
 254                             pil, inofixup, iclr, imap);
 255                 prom_halt();
 256         }
 257
 258         ino = (upa_readl(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 259         if (ino > NUM_IVECS) {
 260                 prom_printf("Invalid INO %04x (%d:%d:%016lx:%016lx)\n",
 261                             ino, pil, inofixup, iclr, imap);
 262                 prom_halt();
 263         }
 264
 265         bucket = &ivector_table[ino];
 266         if (bucket->flags & IBF_ACTIVE)
 267                 build_irq_error("IRQ: Trying to build active INO bucket.\n",
 268                                 ino, pil, inofixup, iclr, imap, bucket);
 269
 270         if (bucket->irq_info) {
 271                 if (bucket->imap != imap || bucket->iclr != iclr)
 272                         build_irq_error("IRQ: Trying to reinit INO bucket.\n",
 273                                         ino, pil, inofixup, iclr, imap, bucket);
 274
 275                 goto out;
 276         }
 277
 278         bucket->irq_info = kmalloc(sizeof(struct irq_desc), GFP_ATOMIC);
 279         if (!bucket->irq_info) {
 280                 prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n");
 281                 prom_halt();
 282         }
 283         memset(bucket->irq_info, 0, sizeof(struct irq_desc));
 284
 285         /* Ok, looks good, set it up.  Don't touch the irq_chain or
 286          * the pending flag.
 287          */
 288         bucket->imap  = imap;
 289         bucket->iclr  = iclr;
 290         bucket->pil   = pil;
 291         bucket->flags = 0;
 292
 293 out:
 294         return __irq(bucket);
 295 }
 296
 297 static void atomic_bucket_insert(struct ino_bucket *bucket)
 298 {
 299         unsigned long pstate;
 300         unsigned int *ent;
 301
 302         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 303         __asm__ __volatile__("wrpr %0, %1, %%pstate"
 304                              : : "r" (pstate), "i" (PSTATE_IE));
 305         ent = irq_work(smp_processor_id(), bucket->pil);
 306         bucket->irq_chain = *ent;
 307         *ent = __irq(bucket);
 308         __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
 309 }
 310
 311 static int check_irq_sharing(int pil, unsigned long irqflags)
 312 {
 313         struct irqaction *action, *tmp;
 314
 315         action = *(irq_action + pil);
 316         if (action) {
 317                 if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
 318                         for (tmp = action; tmp->next; tmp = tmp->next)
 319                                 ;
 320                 } else {
 321                         return -EBUSY;
 322                 }
 323         }
 324         return 0;
 325 }
 326
 327 static void append_irq_action(int pil, struct irqaction *action)
 328 {
 329         struct irqaction **pp = irq_action + pil;
 330
 331         while (*pp)
 332                 pp = &((*pp)->next);
 333         *pp = action;
 334 }
 335
 336 static struct irqaction *get_action_slot(struct ino_bucket *bucket)
 337 {
 338         struct irq_desc *desc = bucket->irq_info;
 339         int max_irq, i;
 340
 341         max_irq = 1;
 342         if (bucket->flags & IBF_PCI)
 343                 max_irq = MAX_IRQ_DESC_ACTION;
 344         for (i = 0; i < max_irq; i++) {
 345                 struct irqaction *p = &desc->action[i];
 346                 u32 mask = (1 << i);
 347
 348                 if (desc->action_active_mask & mask)
 349                         continue;
 350
 351                 desc->action_active_mask |= mask;
 352                 return p;
 353         }
 354         return NULL;
 355 }
 356
 357 int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
 358                 unsigned long irqflags, const char *name, void *dev_id)
 359 {
 360         struct irqaction *action;
 361         struct ino_bucket *bucket = __bucket(irq);
 362         unsigned long flags;
 363         int pending = 0;
 364
 365         if (unlikely(!handler))
 366                 return -EINVAL;
 367
 368         if (unlikely(!bucket->irq_info))
 369                 return -ENODEV;
 370
 371         if ((bucket != &pil0_dummy_bucket) && (irqflags & SA_SAMPLE_RANDOM)) {
 372                 /*
 373                  * This function might sleep, we want to call it first,
 374                  * outside of the atomic block. In SA_STATIC_ALLOC case,
 375                  * random driver's kmalloc will fail, but it is safe.
 376                  * If already initialized, random driver will not reinit.
 377                  * Yes, this might clear the entropy pool if the wrong
 378                  * driver is attempted to be loaded, without actually
 379                  * installing a new handler, but is this really a problem,
 380                  * only the sysadmin is able to do this.
 381                  */
 382                 rand_initialize_irq(irq);
 383         }
 384
 385         spin_lock_irqsave(&irq_action_lock, flags);
 386
 387         if (check_irq_sharing(bucket->pil, irqflags)) {
 388                 spin_unlock_irqrestore(&irq_action_lock, flags);
 389                 return -EBUSY;
 390         }
 391
 392         action = get_action_slot(bucket);
 393         if (!action) {
 394                 spin_unlock_irqrestore(&irq_action_lock, flags);
 395                 return -ENOMEM;
 396         }
 397
 398         bucket->flags |= IBF_ACTIVE;
 399         pending = 0;
 400         if (bucket != &pil0_dummy_bucket) {
 401                 pending = bucket->pending;
 402                 if (pending)
 403                         bucket->pending = 0;
 404         }
 405
 406         action->handler = handler;
 407         action->flags = irqflags;
 408         action->name = name;
 409         action->next = NULL;
 410         action->dev_id = dev_id;
 411         put_ino_in_irqaction(action, irq);
 412         put_smpaff_in_irqaction(action, CPU_MASK_NONE);
 413
 414         append_irq_action(bucket->pil, action);
 415
 416         enable_irq(irq);
 417
 418         /* We ate the IVEC already, this makes sure it does not get lost. */
 419         if (pending) {
 420                 atomic_bucket_insert(bucket);
 421                 set_softint(1 << bucket->pil);
 422         }
 423
 424         spin_unlock_irqrestore(&irq_action_lock, flags);
 425
 426         if (bucket != &pil0_dummy_bucket)
 427                 register_irq_proc(__irq_ino(irq));
 428
 429 #ifdef CONFIG_SMP
 430         distribute_irqs();
 431 #endif
 432         return 0;
 433 }
 434
 435 EXPORT_SYMBOL(request_irq);
 436
 437 static struct irqaction *unlink_irq_action(unsigned int irq, void *dev_id)
 438 {
 439         struct ino_bucket *bucket = __bucket(irq);
 440         struct irqaction *action, **pp;
 441
 442         pp = irq_action + bucket->pil;
 443         action = *pp;
 444         if (unlikely(!action))
 445                 return NULL;
 446
 447         if (unlikely(!action->handler)) {
 448                 printk("Freeing free IRQ %d\n", bucket->pil);
 449                 return NULL;
 450         }
 451
 452         while (action && action->dev_id != dev_id) {
 453                 pp = &action->next;
 454                 action = *pp;
 455         }
 456
 457         if (likely(action))
 458                 *pp = action->next;
 459
 460         return action;
 461 }
 462
 463 void free_irq(unsigned int irq, void *dev_id)
 464 {
 465         struct irqaction *action;
 466         struct ino_bucket *bucket;
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&irq_action_lock, flags);
 470
 471         action = unlink_irq_action(irq, dev_id);
 472
 473         spin_unlock_irqrestore(&irq_action_lock, flags);
 474
 475         if (unlikely(!action))
 476                 return;
 477
 478         synchronize_irq(irq);
 479
 480         spin_lock_irqsave(&irq_action_lock, flags);
 481
 482         bucket = __bucket(irq);
 483         if (bucket != &pil0_dummy_bucket) {
 484                 struct irq_desc *desc = bucket->irq_info;
 485                 unsigned long imap = bucket->imap;
 486                 int ent, i;
 487
 488                 for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
 489                         struct irqaction *p = &desc->action[i];
 490
 491                         if (p == action) {
 492                                 desc->action_active_mask &= ~(1 << i);
 493                                 break;
 494                         }
 495                 }
 496
 497                 if (!desc->action_active_mask) {
 498                         /* This unique interrupt source is now inactive. */
 499                         bucket->flags &= ~IBF_ACTIVE;
 500
 501                         /* See if any other buckets share this bucket's IMAP
 502                          * and are still active.
 503                          */
 504                         for (ent = 0; ent < NUM_IVECS; ent++) {
 505                                 struct ino_bucket *bp = &ivector_table[ent];
 506                                 if (bp != bucket        &&
 507                                     bp->imap == imap    &&
 508                                     (bp->flags & IBF_ACTIVE) != 0)
 509                                         break;
 510                         }
 511
 512                         /* Only disable when no other sub-irq levels of
 513                          * the same IMAP are active.
 514                          */
 515                         if (ent == NUM_IVECS)
 516                                 disable_irq(irq);
 517                 }
 518         }
 519
 520         spin_unlock_irqrestore(&irq_action_lock, flags);
 521 }
 522
 523 EXPORT_SYMBOL(free_irq);
 524
 525 #ifdef CONFIG_SMP
 526 void synchronize_irq(unsigned int irq)
 527 {
 528         struct ino_bucket *bucket = __bucket(irq);
 529
 530 #if 0
 531         /* The following is how I wish I could implement this.
 532          * Unfortunately the ICLR registers are read-only, you can
 533          * only write ICLR_foo values to them.  To get the current
 534          * IRQ status you would need to get at the IRQ diag registers
 535          * in the PCI/SBUS controller and the layout of those vary
 536          * from one controller to the next, sigh... -DaveM
 537          */
 538         unsigned long iclr = bucket->iclr;
 539
 540         while (1) {
 541                 u32 tmp = upa_readl(iclr);
 542
 543                 if (tmp == ICLR_TRANSMIT ||
 544                     tmp == ICLR_PENDING) {
 545                         cpu_relax();
 546                         continue;
 547                 }
 548                 break;
 549         }
 550 #else
 551         /* So we have to do this with a INPROGRESS bit just like x86.  */
 552         while (bucket->flags & IBF_INPROGRESS)
 553                 cpu_relax();
 554 #endif
 555 }
 556 #endif /* CONFIG_SMP */
 557
 558 static void process_bucket(int irq, struct ino_bucket *bp, struct pt_regs *regs)
 559 {
 560         struct irq_desc *desc = bp->irq_info;
 561         unsigned char flags = bp->flags;
 562         u32 action_mask, i;
 563         int random;
 564
 565         bp->flags |= IBF_INPROGRESS;
 566
 567         if (unlikely(!(flags & IBF_ACTIVE))) {
 568                 bp->pending = 1;
 569                 goto out;
 570         }
 571
 572         if (desc->pre_handler)
 573                 desc->pre_handler(bp,
 574                                   desc->pre_handler_arg1,
 575                                   desc->pre_handler_arg2);
 576
 577         action_mask = desc->action_active_mask;
 578         random = 0;
 579         for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
 580                 struct irqaction *p = &desc->action[i];
 581                 u32 mask = (1 << i);
 582
 583                 if (!(action_mask & mask))
 584                         continue;
 585
 586                 action_mask &= ~mask;
 587
 588                 if (p->handler(__irq(bp), p->dev_id, regs) == IRQ_HANDLED)
 589                         random |= p->flags;
 590
 591                 if (!action_mask)
 592                         break;
 593         }
 594         if (bp->pil != 0) {
 595                 upa_writel(ICLR_IDLE, bp->iclr);
 596                 /* Test and add entropy */
 597                 if (random & SA_SAMPLE_RANDOM)
 598                         add_interrupt_randomness(irq);
 599         }
 600 out:
 601         bp->flags &= ~IBF_INPROGRESS;
 602 }
 603
 604 void handler_irq(int irq, struct pt_regs *regs)
 605 {
 606         struct ino_bucket *bp;
 607         int cpu = smp_processor_id();
 608
 609 #ifndef CONFIG_SMP
 610         /*
 611          * Check for TICK_INT on level 14 softint.
 612          */
 613         {
 614                 unsigned long clr_mask = 1 << irq;
 615                 unsigned long tick_mask = tick_ops->softint_mask;
 616
 617                 if ((irq == 14) && (get_softint() & tick_mask)) {
 618                         irq = 0;
 619                         clr_mask = tick_mask;
 620                 }
 621                 clear_softint(clr_mask);
 622         }
 623 #else
 624         clear_softint(1 << irq);
 625 #endif
 626
 627         irq_enter();
 628         kstat_this_cpu.irqs[irq]++;
 629
 630         /* Sliiiick... */
 631 #ifndef CONFIG_SMP
 632         bp = ((irq != 0) ?
 633               __bucket(xchg32(irq_work(cpu, irq), 0)) :
 634               &pil0_dummy_bucket);
 635 #else
 636         bp = __bucket(xchg32(irq_work(cpu, irq), 0));
 637 #endif
 638         while (bp) {
 639                 struct ino_bucket *nbp = __bucket(bp->irq_chain);
 640
 641                 bp->irq_chain = 0;
 642                 process_bucket(irq, bp, regs);
 643                 bp = nbp;
 644         }
 645         irq_exit();
 646 }
 647
 648 #ifdef CONFIG_BLK_DEV_FD
 649 extern irqreturn_t floppy_interrupt(int, void *, struct pt_regs *);;
 650
 651 /* XXX No easy way to include asm/floppy.h XXX */
 652 extern unsigned char *pdma_vaddr;
 653 extern unsigned long pdma_size;
 654 extern volatile int doing_pdma;
 655 extern unsigned long fdc_status;
 656
 657 irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie, struct pt_regs *regs)
 658 {
 659         if (likely(doing_pdma)) {
 660                 void __iomem *stat = (void __iomem *) fdc_status;
 661                 unsigned char *vaddr = pdma_vaddr;
 662                 unsigned long size = pdma_size;
 663                 u8 val;
 664
 665                 while (size) {
 666                         val = readb(stat);
 667                         if (unlikely(!(val & 0x80))) {
 668                                 pdma_vaddr = vaddr;
 669                                 pdma_size = size;
 670                                 return IRQ_HANDLED;
 671                         }
 672                         if (unlikely(!(val & 0x20))) {
 673                                 pdma_vaddr = vaddr;
 674                                 pdma_size = size;
 675                                 doing_pdma = 0;
 676                                 goto main_interrupt;
 677                         }
 678                         if (val & 0x40) {
 679                                 /* read */
 680                                 *vaddr++ = readb(stat + 1);
 681                         } else {
 682                                 unsigned char data = *vaddr++;
 683
 684                                 /* write */
 685                                 writeb(data, stat + 1);
 686                         }
 687                         size--;
 688                 }
 689
 690                 pdma_vaddr = vaddr;
 691                 pdma_size = size;
 692
 693                 /* Send Terminal Count pulse to floppy controller. */
 694                 val = readb(auxio_register);
 695                 val |= AUXIO_AUX1_FTCNT;
 696                 writeb(val, auxio_register);
 697                 val &= AUXIO_AUX1_FTCNT;
 698                 writeb(val, auxio_register);
 699
 700                 doing_pdma = 0;
 701         }
 702
 703 main_interrupt:
 704         return floppy_interrupt(irq, dev_cookie, regs);
 705 }
 706 EXPORT_SYMBOL(sparc_floppy_irq);
 707 #endif
 708
 709 /* We really don't need these at all on the Sparc.  We only have
 710  * stubs here because they are exported to modules.
 711  */
 712 unsigned long probe_irq_on(void)
 713 {
 714         return 0;
 715 }
 716
 717 EXPORT_SYMBOL(probe_irq_on);
 718
 719 int probe_irq_off(unsigned long mask)
 720 {
 721         return 0;
 722 }
 723
 724 EXPORT_SYMBOL(probe_irq_off);
 725
 726 #ifdef CONFIG_SMP
 727 static int retarget_one_irq(struct irqaction *p, int goal_cpu)
 728 {
 729         struct ino_bucket *bucket = get_ino_in_irqaction(p) + ivector_table;
 730         unsigned long imap = bucket->imap;
 731         unsigned int tid;
 732
 733         while (!cpu_online(goal_cpu)) {
 734                 if (++goal_cpu >= NR_CPUS)
 735                         goal_cpu = 0;
 736         }
 737
 738         if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 739                 tid = goal_cpu << 26;
 740                 tid &= IMAP_AID_SAFARI;
 741         } else if (this_is_starfire == 0) {
 742                 tid = goal_cpu << 26;
 743                 tid &= IMAP_TID_UPA;
 744         } else {
 745                 tid = (starfire_translate(imap, goal_cpu) << 26);
 746                 tid &= IMAP_TID_UPA;
 747         }
 748         upa_writel(tid | IMAP_VALID, imap);
 749
 750         do {
 751                 if (++goal_cpu >= NR_CPUS)
 752                         goal_cpu = 0;
 753         } while (!cpu_online(goal_cpu));
 754
 755         return goal_cpu;
 756 }
 757
 758 /* Called from request_irq. */
 759 static void distribute_irqs(void)
 760 {
 761         unsigned long flags;
 762         int cpu, level;
 763
 764         spin_lock_irqsave(&irq_action_lock, flags);
 765         cpu = 0;
 766
 767         /*
 768          * Skip the timer at [0], and very rare error/power intrs at [15].
 769          * Also level [12], it causes problems on Ex000 systems.
 770          */
 771         for (level = 1; level < NR_IRQS; level++) {
 772                 struct irqaction *p = irq_action[level];
 773
 774                 if (level == 12)
 775                         continue;
 776
 777                 while(p) {
 778                         cpu = retarget_one_irq(p, cpu);
 779                         p = p->next;
 780                 }
 781         }
 782         spin_unlock_irqrestore(&irq_action_lock, flags);
 783 }
 784 #endif
 785
 786 struct sun5_timer {
 787         u64     count0;
 788         u64     limit0;
 789         u64     count1;
 790         u64     limit1;
 791 };
 792
 793 static struct sun5_timer *prom_timers;
 794 static u64 prom_limit0, prom_limit1;
 795
 796 static void map_prom_timers(void)
 797 {
 798         unsigned int addr[3];
 799         int tnode, err;
 800
 801         /* PROM timer node hangs out in the top level of device siblings... */
 802         tnode = prom_finddevice("/counter-timer");
 803
 804         /* Assume if node is not present, PROM uses different tick mechanism
 805          * which we should not care about.
 806          */
 807         if (tnode == 0 || tnode == -1) {
 808                 prom_timers = (struct sun5_timer *) 0;
 809                 return;
 810         }
 811
 812         /* If PROM is really using this, it must be mapped by him. */
 813         err = prom_getproperty(tnode, "address", (char *)addr, sizeof(addr));
 814         if (err == -1) {
 815                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 816                 prom_timers = (struct sun5_timer *) 0;
 817                 return;
 818         }
 819         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 820 }
 821
 822 static void kill_prom_timer(void)
 823 {
 824         if (!prom_timers)
 825                 return;
 826
 827         /* Save them away for later. */
 828         prom_limit0 = prom_timers->limit0;
 829         prom_limit1 = prom_timers->limit1;
 830
 831         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 832          * We turn both off here just to be paranoid.
 833          */
 834         prom_timers->limit0 = 0;
 835         prom_timers->limit1 = 0;
 836
 837         /* Wheee, eat the interrupt packet too... */
 838         __asm__ __volatile__(
 839 "       mov     0x40, %%g2\n"
 840 "       ldxa    [%%g0] %0, %%g1\n"
 841 "       ldxa    [%%g2] %1, %%g1\n"
 842 "       stxa    %%g0, [%%g0] %0\n"
 843 "       membar  #Sync\n"
 844         : /* no outputs */
 845         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 846         : "g1", "g2");
 847 }
 848
 849 void init_irqwork_curcpu(void)
 850 {
 851         register struct irq_work_struct *workp asm("o2");
 852         register unsigned long tmp asm("o3");
 853         int cpu = hard_smp_processor_id();
 854
 855         memset(__irq_work + cpu, 0, sizeof(*workp));
 856
 857         /* Make sure we are called with PSTATE_IE disabled.  */
 858         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
 859                              : "=r" (tmp));
 860         if (tmp & PSTATE_IE) {
 861                 prom_printf("BUG: init_irqwork_curcpu() called with "
 862                             "PSTATE_IE enabled, bailing.\n");
 863                 __asm__ __volatile__("mov       %%i7, %0\n\t"
 864                                      : "=r" (tmp));
 865                 prom_printf("BUG: Called from %lx\n", tmp);
 866                 prom_halt();
 867         }
 868
 869         /* Set interrupt globals.  */
 870         workp = &__irq_work[cpu];
 871         __asm__ __volatile__(
 872         "rdpr   %%pstate, %0\n\t"
 873         "wrpr   %0, %1, %%pstate\n\t"
 874         "mov    %2, %%g6\n\t"
 875         "wrpr   %0, 0x0, %%pstate\n\t"
 876         : "=&r" (tmp)
 877         : "i" (PSTATE_IG), "r" (workp));
 878 }
 879
 880 /* Only invoked on boot processor. */
 881 void __init init_IRQ(void)
 882 {
 883         map_prom_timers();
 884         kill_prom_timer();
 885         memset(&ivector_table[0], 0, sizeof(ivector_table));
 886
 887         /* We need to clear any IRQ's pending in the soft interrupt
 888          * registers, a spurious one could be left around from the
 889          * PROM timer which we just disabled.
 890          */
 891         clear_softint(get_softint());
 892
 893         /* Now that ivector table is initialized, it is safe
 894          * to receive IRQ vector traps.  We will normally take
 895          * one or two right now, in case some device PROM used
 896          * to boot us wants to speak to us.  We just ignore them.
 897          */
 898         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
 899                              "or        %%g1, %0, %%g1\n\t"
 900                              "wrpr      %%g1, 0x0, %%pstate"
 901                              : /* No outputs */
 902                              : "i" (PSTATE_IE)
 903                              : "g1");
 904 }
 905
 906 static struct proc_dir_entry * root_irq_dir;
 907 static struct proc_dir_entry * irq_dir [NUM_IVECS];
 908
 909 #ifdef CONFIG_SMP
 910
 911 static int irq_affinity_read_proc (char *page, char **start, off_t off,
 912                         int count, int *eof, void *data)
 913 {
 914         struct ino_bucket *bp = ivector_table + (long)data;
 915         struct irq_desc *desc = bp->irq_info;
 916         struct irqaction *ap = desc->action;
 917         cpumask_t mask;
 918         int len;
 919
 920         mask = get_smpaff_in_irqaction(ap);
 921         if (cpus_empty(mask))
 922                 mask = cpu_online_map;
 923
 924         len = cpumask_scnprintf(page, count, mask);
 925         if (count - len < 2)
 926                 return -EINVAL;
 927         len += sprintf(page + len, "\n");
 928         return len;
 929 }
 930
 931 static inline void set_intr_affinity(int irq, cpumask_t hw_aff)
 932 {
 933         struct ino_bucket *bp = ivector_table + irq;
 934         struct irq_desc *desc = bp->irq_info;
 935         struct irqaction *ap = desc->action;
 936
 937         /* Users specify affinity in terms of hw cpu ids.
 938          * As soon as we do this, handler_irq() might see and take action.
 939          */
 940         put_smpaff_in_irqaction(ap, hw_aff);
 941
 942         /* Migration is simply done by the next cpu to service this
 943          * interrupt.
 944          */
 945 }
 946
 947 static int irq_affinity_write_proc (struct file *file, const char __user *buffer,
 948                                         unsigned long count, void *data)
 949 {
 950         int irq = (long) data, full_count = count, err;
 951         cpumask_t new_value;
 952
 953         err = cpumask_parse(buffer, count, new_value);
 954
 955         /*
 956          * Do not allow disabling IRQs completely - it's a too easy
 957          * way to make the system unusable accidentally :-) At least
 958          * one online CPU still has to be targeted.
 959          */
 960         cpus_and(new_value, new_value, cpu_online_map);
 961         if (cpus_empty(new_value))
 962                 return -EINVAL;
 963
 964         set_intr_affinity(irq, new_value);
 965
 966         return full_count;
 967 }
 968
 969 #endif
 970
 971 #define MAX_NAMELEN 10
 972
 973 static void register_irq_proc (unsigned int irq)
 974 {
 975         char name [MAX_NAMELEN];
 976
 977         if (!root_irq_dir || irq_dir[irq])
 978                 return;
 979
 980         memset(name, 0, MAX_NAMELEN);
 981         sprintf(name, "%x", irq);
 982
 983         /* create /proc/irq/1234 */
 984         irq_dir[irq] = proc_mkdir(name, root_irq_dir);
 985
 986 #ifdef CONFIG_SMP
 987         /* XXX SMP affinity not supported on starfire yet. */
 988         if (this_is_starfire == 0) {
 989                 struct proc_dir_entry *entry;
 990
 991                 /* create /proc/irq/1234/smp_affinity */
 992                 entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
 993
 994                 if (entry) {
 995                         entry->nlink = 1;
 996                         entry->data = (void *)(long)irq;
 997                         entry->read_proc = irq_affinity_read_proc;
 998                         entry->write_proc = irq_affinity_write_proc;
 999                 }
1000         }
1001 #endif
1002 }
1003
1004 void init_irq_proc (void)
1005 {
1006         /* create /proc/irq */
1007         root_irq_dir = proc_mkdir("irq", NULL);
1008 }
1009