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   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/module.h>
  10 #include <linux/sched.h>
  11 #include <linux/ptrace.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/signal.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/slab.h>
  18 #include <linux/random.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/irq.h>
  25 #include <linux/msi.h>
  26
  27 #include <asm/ptrace.h>
  28 #include <asm/processor.h>
  29 #include <asm/atomic.h>
  30 #include <asm/system.h>
  31 #include <asm/irq.h>
  32 #include <asm/io.h>
  33 #include <asm/sbus.h>
  34 #include <asm/iommu.h>
  35 #include <asm/upa.h>
  36 #include <asm/oplib.h>
  37 #include <asm/prom.h>
  38 #include <asm/timer.h>
  39 #include <asm/smp.h>
  40 #include <asm/starfire.h>
  41 #include <asm/uaccess.h>
  42 #include <asm/cache.h>
  43 #include <asm/cpudata.h>
  44 #include <asm/auxio.h>
  45 #include <asm/head.h>
  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  * If you make changes to ino_bucket, please update hand coded assembler
  60  * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
  61  */
  62 struct ino_bucket {
  63         /* Next handler in per-CPU IRQ worklist.  We know that
  64          * bucket pointers have the high 32-bits clear, so to
  65          * save space we only store the bits we need.
  66          */
  67 /*0x00*/unsigned int irq_chain;
  68
  69         /* Virtual interrupt number assigned to this INO.  */
  70 /*0x04*/unsigned int virt_irq;
  71 };
  72
  73 #define NUM_IVECS       (IMAP_INR + 1)
  74 struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
  75
  76 #define __irq_ino(irq) \
  77         (((struct ino_bucket *)(unsigned long)(irq)) - &ivector_table[0])
  78 #define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq))
  79 #define __irq(bucket) ((unsigned int)(unsigned long)(bucket))
  80
  81 /* This has to be in the main kernel image, it cannot be
  82  * turned into per-cpu data.  The reason is that the main
  83  * kernel image is locked into the TLB and this structure
  84  * is accessed from the vectored interrupt trap handler.  If
  85  * access to this structure takes a TLB miss it could cause
  86  * the 5-level sparc v9 trap stack to overflow.
  87  */
  88 #define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist)
  89
  90 static unsigned int virt_to_real_irq_table[NR_IRQS];
  91
  92 static unsigned char virt_irq_alloc(unsigned int real_irq)
  93 {
  94         unsigned char ent;
  95
  96         BUILD_BUG_ON(NR_IRQS >= 256);
  97
  98         for (ent = 1; ent < NR_IRQS; ent++) {
  99                 if (!virt_to_real_irq_table[ent])
 100                         break;
 101         }
 102         if (ent >= NR_IRQS) {
 103                 printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
 104                 return 0;
 105         }
 106
 107         virt_to_real_irq_table[ent] = real_irq;
 108
 109         return ent;
 110 }
 111
 112 static void virt_irq_free(unsigned int virt_irq)
 113 {
 114         unsigned int real_irq;
 115
 116         if (virt_irq >= NR_IRQS)
 117                 return;
 118
 119         real_irq = virt_to_real_irq_table[virt_irq];
 120         virt_to_real_irq_table[virt_irq] = 0;
 121
 122         __bucket(real_irq)->virt_irq = 0;
 123 }
 124
 125 static unsigned int virt_to_real_irq(unsigned char virt_irq)
 126 {
 127         return virt_to_real_irq_table[virt_irq];
 128 }
 129
 130 /*
 131  * /proc/interrupts printing:
 132  */
 133
 134 int show_interrupts(struct seq_file *p, void *v)
 135 {
 136         int i = *(loff_t *) v, j;
 137         struct irqaction * action;
 138         unsigned long flags;
 139
 140         if (i == 0) {
 141                 seq_printf(p, "           ");
 142                 for_each_online_cpu(j)
 143                         seq_printf(p, "CPU%d       ",j);
 144                 seq_putc(p, '\n');
 145         }
 146
 147         if (i < NR_IRQS) {
 148                 spin_lock_irqsave(&irq_desc[i].lock, flags);
 149                 action = irq_desc[i].action;
 150                 if (!action)
 151                         goto skip;
 152                 seq_printf(p, "%3d: ",i);
 153 #ifndef CONFIG_SMP
 154                 seq_printf(p, "%10u ", kstat_irqs(i));
 155 #else
 156                 for_each_online_cpu(j)
 157                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
 158 #endif
 159                 seq_printf(p, " %9s", irq_desc[i].chip->typename);
 160                 seq_printf(p, "  %s", action->name);
 161
 162                 for (action=action->next; action; action = action->next)
 163                         seq_printf(p, ", %s", action->name);
 164
 165                 seq_putc(p, '\n');
 166 skip:
 167                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 168         }
 169         return 0;
 170 }
 171
 172 extern unsigned long real_hard_smp_processor_id(void);
 173
 174 static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
 175 {
 176         unsigned int tid;
 177
 178         if (this_is_starfire) {
 179                 tid = starfire_translate(imap, cpuid);
 180                 tid <<= IMAP_TID_SHIFT;
 181                 tid &= IMAP_TID_UPA;
 182         } else {
 183                 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 184                         unsigned long ver;
 185
 186                         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 187                         if ((ver >> 32UL) == __JALAPENO_ID ||
 188                             (ver >> 32UL) == __SERRANO_ID) {
 189                                 tid = cpuid << IMAP_TID_SHIFT;
 190                                 tid &= IMAP_TID_JBUS;
 191                         } else {
 192                                 unsigned int a = cpuid & 0x1f;
 193                                 unsigned int n = (cpuid >> 5) & 0x1f;
 194
 195                                 tid = ((a << IMAP_AID_SHIFT) |
 196                                        (n << IMAP_NID_SHIFT));
 197                                 tid &= (IMAP_AID_SAFARI |
 198                                         IMAP_NID_SAFARI);;
 199                         }
 200                 } else {
 201                         tid = cpuid << IMAP_TID_SHIFT;
 202                         tid &= IMAP_TID_UPA;
 203                 }
 204         }
 205
 206         return tid;
 207 }
 208
 209 struct irq_handler_data {
 210         unsigned long   iclr;
 211         unsigned long   imap;
 212
 213         void            (*pre_handler)(unsigned int, void *, void *);
 214         void            *pre_handler_arg1;
 215         void            *pre_handler_arg2;
 216 };
 217
 218 static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
 219 {
 220         unsigned int real_irq = virt_to_real_irq(virt_irq);
 221         struct ino_bucket *bucket = NULL;
 222
 223         if (likely(real_irq))
 224                 bucket = __bucket(real_irq);
 225
 226         return bucket;
 227 }
 228
 229 #ifdef CONFIG_SMP
 230 static int irq_choose_cpu(unsigned int virt_irq)
 231 {
 232         cpumask_t mask = irq_desc[virt_irq].affinity;
 233         int cpuid;
 234
 235         if (cpus_equal(mask, CPU_MASK_ALL)) {
 236                 static int irq_rover;
 237                 static DEFINE_SPINLOCK(irq_rover_lock);
 238                 unsigned long flags;
 239
 240                 /* Round-robin distribution... */
 241         do_round_robin:
 242                 spin_lock_irqsave(&irq_rover_lock, flags);
 243
 244                 while (!cpu_online(irq_rover)) {
 245                         if (++irq_rover >= NR_CPUS)
 246                                 irq_rover = 0;
 247                 }
 248                 cpuid = irq_rover;
 249                 do {
 250                         if (++irq_rover >= NR_CPUS)
 251                                 irq_rover = 0;
 252                 } while (!cpu_online(irq_rover));
 253
 254                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 255         } else {
 256                 cpumask_t tmp;
 257
 258                 cpus_and(tmp, cpu_online_map, mask);
 259
 260                 if (cpus_empty(tmp))
 261                         goto do_round_robin;
 262
 263                 cpuid = first_cpu(tmp);
 264         }
 265
 266         return cpuid;
 267 }
 268 #else
 269 static int irq_choose_cpu(unsigned int virt_irq)
 270 {
 271         return real_hard_smp_processor_id();
 272 }
 273 #endif
 274
 275 static void sun4u_irq_enable(unsigned int virt_irq)
 276 {
 277         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 278
 279         if (likely(data)) {
 280                 unsigned long cpuid, imap;
 281                 unsigned int tid;
 282
 283                 cpuid = irq_choose_cpu(virt_irq);
 284                 imap = data->imap;
 285
 286                 tid = sun4u_compute_tid(imap, cpuid);
 287
 288                 upa_writel(tid | IMAP_VALID, imap);
 289         }
 290 }
 291
 292 static void sun4u_irq_disable(unsigned int virt_irq)
 293 {
 294         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 295
 296         if (likely(data)) {
 297                 unsigned long imap = data->imap;
 298                 u32 tmp = upa_readl(imap);
 299
 300                 tmp &= ~IMAP_VALID;
 301                 upa_writel(tmp, imap);
 302         }
 303 }
 304
 305 static void sun4u_irq_end(unsigned int virt_irq)
 306 {
 307         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 308
 309         if (likely(data))
 310                 upa_writel(ICLR_IDLE, data->iclr);
 311 }
 312
 313 static void sun4v_irq_enable(unsigned int virt_irq)
 314 {
 315         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 316         unsigned int ino = bucket - &ivector_table[0];
 317
 318         if (likely(bucket)) {
 319                 unsigned long cpuid;
 320                 int err;
 321
 322                 cpuid = irq_choose_cpu(virt_irq);
 323
 324                 err = sun4v_intr_settarget(ino, cpuid);
 325                 if (err != HV_EOK)
 326                         printk("sun4v_intr_settarget(%x,%lu): err(%d)\n",
 327                                ino, cpuid, err);
 328                 err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
 329                 if (err != HV_EOK)
 330                         printk("sun4v_intr_setenabled(%x): err(%d)\n",
 331                                ino, err);
 332         }
 333 }
 334
 335 static void sun4v_irq_disable(unsigned int virt_irq)
 336 {
 337         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 338         unsigned int ino = bucket - &ivector_table[0];
 339
 340         if (likely(bucket)) {
 341                 int err;
 342
 343                 err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
 344                 if (err != HV_EOK)
 345                         printk("sun4v_intr_setenabled(%x): "
 346                                "err(%d)\n", ino, err);
 347         }
 348 }
 349
 350 #ifdef CONFIG_PCI_MSI
 351 static void sun4v_msi_enable(unsigned int virt_irq)
 352 {
 353         sun4v_irq_enable(virt_irq);
 354         unmask_msi_irq(virt_irq);
 355 }
 356
 357 static void sun4v_msi_disable(unsigned int virt_irq)
 358 {
 359         mask_msi_irq(virt_irq);
 360         sun4v_irq_disable(virt_irq);
 361 }
 362 #endif
 363
 364 static void sun4v_irq_end(unsigned int virt_irq)
 365 {
 366         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 367         unsigned int ino = bucket - &ivector_table[0];
 368
 369         if (likely(bucket)) {
 370                 int err;
 371
 372                 err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
 373                 if (err != HV_EOK)
 374                         printk("sun4v_intr_setstate(%x): "
 375                                "err(%d)\n", ino, err);
 376         }
 377 }
 378
 379 static void run_pre_handler(unsigned int virt_irq)
 380 {
 381         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 382         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 383
 384         if (likely(data->pre_handler)) {
 385                 data->pre_handler(__irq_ino(__irq(bucket)),
 386                                   data->pre_handler_arg1,
 387                                   data->pre_handler_arg2);
 388         }
 389 }
 390
 391 static struct irq_chip sun4u_irq = {
 392         .typename       = "sun4u",
 393         .enable         = sun4u_irq_enable,
 394         .disable        = sun4u_irq_disable,
 395         .end            = sun4u_irq_end,
 396 };
 397
 398 static struct irq_chip sun4u_irq_ack = {
 399         .typename       = "sun4u+ack",
 400         .enable         = sun4u_irq_enable,
 401         .disable        = sun4u_irq_disable,
 402         .ack            = run_pre_handler,
 403         .end            = sun4u_irq_end,
 404 };
 405
 406 static struct irq_chip sun4v_irq = {
 407         .typename       = "sun4v",
 408         .enable         = sun4v_irq_enable,
 409         .disable        = sun4v_irq_disable,
 410         .end            = sun4v_irq_end,
 411 };
 412
 413 static struct irq_chip sun4v_irq_ack = {
 414         .typename       = "sun4v+ack",
 415         .enable         = sun4v_irq_enable,
 416         .disable        = sun4v_irq_disable,
 417         .ack            = run_pre_handler,
 418         .end            = sun4v_irq_end,
 419 };
 420
 421 #ifdef CONFIG_PCI_MSI
 422 static struct irq_chip sun4v_msi = {
 423         .typename       = "sun4v+msi",
 424         .mask           = mask_msi_irq,
 425         .unmask         = unmask_msi_irq,
 426         .enable         = sun4v_msi_enable,
 427         .disable        = sun4v_msi_disable,
 428         .ack            = run_pre_handler,
 429         .end            = sun4v_irq_end,
 430 };
 431 #endif
 432
 433 void irq_install_pre_handler(int virt_irq,
 434                              void (*func)(unsigned int, void *, void *),
 435                              void *arg1, void *arg2)
 436 {
 437         struct irq_handler_data *data = get_irq_chip_data(virt_irq);
 438         struct irq_chip *chip;
 439
 440         data->pre_handler = func;
 441         data->pre_handler_arg1 = arg1;
 442         data->pre_handler_arg2 = arg2;
 443
 444         chip = get_irq_chip(virt_irq);
 445         if (chip == &sun4u_irq_ack ||
 446             chip == &sun4v_irq_ack
 447 #ifdef CONFIG_PCI_MSI
 448             || chip == &sun4v_msi
 449 #endif
 450             )
 451                 return;
 452
 453         chip = (chip == &sun4u_irq ?
 454                 &sun4u_irq_ack : &sun4v_irq_ack);
 455         set_irq_chip(virt_irq, chip);
 456 }
 457
 458 unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
 459 {
 460         struct ino_bucket *bucket;
 461         struct irq_handler_data *data;
 462         int ino;
 463
 464         BUG_ON(tlb_type == hypervisor);
 465
 466         ino = (upa_readl(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
 467         bucket = &ivector_table[ino];
 468         if (!bucket->virt_irq) {
 469                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 470                 set_irq_chip(bucket->virt_irq, &sun4u_irq);
 471         }
 472
 473         data = get_irq_chip_data(bucket->virt_irq);
 474         if (unlikely(data))
 475                 goto out;
 476
 477         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 478         if (unlikely(!data)) {
 479                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 480                 prom_halt();
 481         }
 482         set_irq_chip_data(bucket->virt_irq, data);
 483
 484         data->imap  = imap;
 485         data->iclr  = iclr;
 486
 487 out:
 488         return bucket->virt_irq;
 489 }
 490
 491 unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
 492 {
 493         struct ino_bucket *bucket;
 494         struct irq_handler_data *data;
 495         unsigned long sysino;
 496
 497         BUG_ON(tlb_type != hypervisor);
 498
 499         sysino = sun4v_devino_to_sysino(devhandle, devino);
 500         bucket = &ivector_table[sysino];
 501         if (!bucket->virt_irq) {
 502                 bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 503                 set_irq_chip(bucket->virt_irq, &sun4v_irq);
 504         }
 505
 506         data = get_irq_chip_data(bucket->virt_irq);
 507         if (unlikely(data))
 508                 goto out;
 509
 510         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 511         if (unlikely(!data)) {
 512                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 513                 prom_halt();
 514         }
 515         set_irq_chip_data(bucket->virt_irq, data);
 516
 517         /* Catch accidental accesses to these things.  IMAP/ICLR handling
 518          * is done by hypervisor calls on sun4v platforms, not by direct
 519          * register accesses.
 520          */
 521         data->imap = ~0UL;
 522         data->iclr = ~0UL;
 523
 524 out:
 525         return bucket->virt_irq;
 526 }
 527
 528 #ifdef CONFIG_PCI_MSI
 529 unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
 530                              unsigned int msi_start, unsigned int msi_end)
 531 {
 532         struct ino_bucket *bucket;
 533         struct irq_handler_data *data;
 534         unsigned long sysino;
 535         unsigned int devino;
 536
 537         BUG_ON(tlb_type != hypervisor);
 538
 539         /* Find a free devino in the given range.  */
 540         for (devino = msi_start; devino < msi_end; devino++) {
 541                 sysino = sun4v_devino_to_sysino(devhandle, devino);
 542                 bucket = &ivector_table[sysino];
 543                 if (!bucket->virt_irq)
 544                         break;
 545         }
 546         if (devino >= msi_end)
 547                 return 0;
 548
 549         sysino = sun4v_devino_to_sysino(devhandle, devino);
 550         bucket = &ivector_table[sysino];
 551         bucket->virt_irq = virt_irq_alloc(__irq(bucket));
 552         *virt_irq_p = bucket->virt_irq;
 553         set_irq_chip(bucket->virt_irq, &sun4v_msi);
 554
 555         data = get_irq_chip_data(bucket->virt_irq);
 556         if (unlikely(data))
 557                 return devino;
 558
 559         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
 560         if (unlikely(!data)) {
 561                 prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
 562                 prom_halt();
 563         }
 564         set_irq_chip_data(bucket->virt_irq, data);
 565
 566         data->imap = ~0UL;
 567         data->iclr = ~0UL;
 568
 569         return devino;
 570 }
 571
 572 void sun4v_destroy_msi(unsigned int virt_irq)
 573 {
 574         virt_irq_free(virt_irq);
 575 }
 576 #endif
 577
 578 void ack_bad_irq(unsigned int virt_irq)
 579 {
 580         struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
 581         unsigned int ino = 0xdeadbeef;
 582
 583         if (bucket)
 584                 ino = bucket - &ivector_table[0];
 585
 586         printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
 587                ino, virt_irq);
 588 }
 589
 590 #ifndef CONFIG_SMP
 591 extern irqreturn_t timer_interrupt(int, void *);
 592
 593 void timer_irq(int irq, struct pt_regs *regs)
 594 {
 595         unsigned long clr_mask = 1 << irq;
 596         unsigned long tick_mask = tick_ops->softint_mask;
 597         struct pt_regs *old_regs;
 598
 599         if (get_softint() & tick_mask) {
 600                 irq = 0;
 601                 clr_mask = tick_mask;
 602         }
 603         clear_softint(clr_mask);
 604
 605         old_regs = set_irq_regs(regs);
 606         irq_enter();
 607
 608         kstat_this_cpu.irqs[0]++;
 609         timer_interrupt(irq, NULL);
 610
 611         irq_exit();
 612         set_irq_regs(old_regs);
 613 }
 614 #endif
 615
 616 void handler_irq(int irq, struct pt_regs *regs)
 617 {
 618         struct ino_bucket *bucket;
 619         struct pt_regs *old_regs;
 620
 621         clear_softint(1 << irq);
 622
 623         old_regs = set_irq_regs(regs);
 624         irq_enter();
 625
 626         /* Sliiiick... */
 627         bucket = __bucket(xchg32(irq_work(smp_processor_id()), 0));
 628         while (bucket) {
 629                 struct ino_bucket *next = __bucket(bucket->irq_chain);
 630
 631                 bucket->irq_chain = 0;
 632                 __do_IRQ(bucket->virt_irq);
 633
 634                 bucket = next;
 635         }
 636
 637         irq_exit();
 638         set_irq_regs(old_regs);
 639 }
 640
 641 struct sun5_timer {
 642         u64     count0;
 643         u64     limit0;
 644         u64     count1;
 645         u64     limit1;
 646 };
 647
 648 static struct sun5_timer *prom_timers;
 649 static u64 prom_limit0, prom_limit1;
 650
 651 static void map_prom_timers(void)
 652 {
 653         struct device_node *dp;
 654         unsigned int *addr;
 655
 656         /* PROM timer node hangs out in the top level of device siblings... */
 657         dp = of_find_node_by_path("/");
 658         dp = dp->child;
 659         while (dp) {
 660                 if (!strcmp(dp->name, "counter-timer"))
 661                         break;
 662                 dp = dp->sibling;
 663         }
 664
 665         /* Assume if node is not present, PROM uses different tick mechanism
 666          * which we should not care about.
 667          */
 668         if (!dp) {
 669                 prom_timers = (struct sun5_timer *) 0;
 670                 return;
 671         }
 672
 673         /* If PROM is really using this, it must be mapped by him. */
 674         addr = of_get_property(dp, "address", NULL);
 675         if (!addr) {
 676                 prom_printf("PROM does not have timer mapped, trying to continue.\n");
 677                 prom_timers = (struct sun5_timer *) 0;
 678                 return;
 679         }
 680         prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]);
 681 }
 682
 683 static void kill_prom_timer(void)
 684 {
 685         if (!prom_timers)
 686                 return;
 687
 688         /* Save them away for later. */
 689         prom_limit0 = prom_timers->limit0;
 690         prom_limit1 = prom_timers->limit1;
 691
 692         /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
 693          * We turn both off here just to be paranoid.
 694          */
 695         prom_timers->limit0 = 0;
 696         prom_timers->limit1 = 0;
 697
 698         /* Wheee, eat the interrupt packet too... */
 699         __asm__ __volatile__(
 700 "       mov     0x40, %%g2\n"
 701 "       ldxa    [%%g0] %0, %%g1\n"
 702 "       ldxa    [%%g2] %1, %%g1\n"
 703 "       stxa    %%g0, [%%g0] %0\n"
 704 "       membar  #Sync\n"
 705         : /* no outputs */
 706         : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
 707         : "g1", "g2");
 708 }
 709
 710 void init_irqwork_curcpu(void)
 711 {
 712         int cpu = hard_smp_processor_id();
 713
 714         trap_block[cpu].irq_worklist = 0;
 715 }
 716
 717 static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type)
 718 {
 719         unsigned long num_entries = 128;
 720         unsigned long status;
 721
 722         status = sun4v_cpu_qconf(type, paddr, num_entries);
 723         if (status != HV_EOK) {
 724                 prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, "
 725                             "err %lu\n", type, paddr, num_entries, status);
 726                 prom_halt();
 727         }
 728 }
 729
 730 static void __cpuinit sun4v_register_mondo_queues(int this_cpu)
 731 {
 732         struct trap_per_cpu *tb = &trap_block[this_cpu];
 733
 734         register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO);
 735         register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO);
 736         register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR);
 737         register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR);
 738 }
 739
 740 static void __cpuinit alloc_one_mondo(unsigned long *pa_ptr, int use_bootmem)
 741 {
 742         void *page;
 743
 744         if (use_bootmem)
 745                 page = alloc_bootmem_low_pages(PAGE_SIZE);
 746         else
 747                 page = (void *) get_zeroed_page(GFP_ATOMIC);
 748
 749         if (!page) {
 750                 prom_printf("SUN4V: Error, cannot allocate mondo queue.\n");
 751                 prom_halt();
 752         }
 753
 754         *pa_ptr = __pa(page);
 755 }
 756
 757 static void __cpuinit alloc_one_kbuf(unsigned long *pa_ptr, int use_bootmem)
 758 {
 759         void *page;
 760
 761         if (use_bootmem)
 762                 page = alloc_bootmem_low_pages(PAGE_SIZE);
 763         else
 764                 page = (void *) get_zeroed_page(GFP_ATOMIC);
 765
 766         if (!page) {
 767                 prom_printf("SUN4V: Error, cannot allocate kbuf page.\n");
 768                 prom_halt();
 769         }
 770
 771         *pa_ptr = __pa(page);
 772 }
 773
 774 static void __cpuinit init_cpu_send_mondo_info(struct trap_per_cpu *tb, int use_bootmem)
 775 {
 776 #ifdef CONFIG_SMP
 777         void *page;
 778
 779         BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64));
 780
 781         if (use_bootmem)
 782                 page = alloc_bootmem_low_pages(PAGE_SIZE);
 783         else
 784                 page = (void *) get_zeroed_page(GFP_ATOMIC);
 785
 786         if (!page) {
 787                 prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n");
 788                 prom_halt();
 789         }
 790
 791         tb->cpu_mondo_block_pa = __pa(page);
 792         tb->cpu_list_pa = __pa(page + 64);
 793 #endif
 794 }
 795
 796 /* Allocate and register the mondo and error queues for this cpu.  */
 797 void __cpuinit sun4v_init_mondo_queues(int use_bootmem, int cpu, int alloc, int load)
 798 {
 799         struct trap_per_cpu *tb = &trap_block[cpu];
 800
 801         if (alloc) {
 802                 alloc_one_mondo(&tb->cpu_mondo_pa, use_bootmem);
 803                 alloc_one_mondo(&tb->dev_mondo_pa, use_bootmem);
 804                 alloc_one_mondo(&tb->resum_mondo_pa, use_bootmem);
 805                 alloc_one_kbuf(&tb->resum_kernel_buf_pa, use_bootmem);
 806                 alloc_one_mondo(&tb->nonresum_mondo_pa, use_bootmem);
 807                 alloc_one_kbuf(&tb->nonresum_kernel_buf_pa, use_bootmem);
 808
 809                 init_cpu_send_mondo_info(tb, use_bootmem);
 810         }
 811
 812         if (load) {
 813                 if (cpu != hard_smp_processor_id()) {
 814                         prom_printf("SUN4V: init mondo on cpu %d not %d\n",
 815                                     cpu, hard_smp_processor_id());
 816                         prom_halt();
 817                 }
 818                 sun4v_register_mondo_queues(cpu);
 819         }
 820 }
 821
 822 static struct irqaction timer_irq_action = {
 823         .name = "timer",
 824 };
 825
 826 /* Only invoked on boot processor. */
 827 void __init init_IRQ(void)
 828 {
 829         map_prom_timers();
 830         kill_prom_timer();
 831         memset(&ivector_table[0], 0, sizeof(ivector_table));
 832
 833         if (tlb_type == hypervisor)
 834                 sun4v_init_mondo_queues(1, hard_smp_processor_id(), 1, 1);
 835
 836         /* We need to clear any IRQ's pending in the soft interrupt
 837          * registers, a spurious one could be left around from the
 838          * PROM timer which we just disabled.
 839          */
 840         clear_softint(get_softint());
 841
 842         /* Now that ivector table is initialized, it is safe
 843          * to receive IRQ vector traps.  We will normally take
 844          * one or two right now, in case some device PROM used
 845          * to boot us wants to speak to us.  We just ignore them.
 846          */
 847         __asm__ __volatile__("rdpr      %%pstate, %%g1\n\t"
 848                              "or        %%g1, %0, %%g1\n\t"
 849                              "wrpr      %%g1, 0x0, %%pstate"
 850                              : /* No outputs */
 851                              : "i" (PSTATE_IE)
 852                              : "g1");
 853
 854         irq_desc[0].action = &timer_irq_action;
 855 }