git.oblomov.eu Git - linux-2.6/blob - arch/powerpc/platforms/powermac/pic.c

   1 /*
   2  *  Support for the interrupt controllers found on Power Macintosh,
   3  *  currently Apple's "Grand Central" interrupt controller in all
   4  *  it's incarnations. OpenPIC support used on newer machines is
   5  *  in a separate file
   6  *
   7  *  Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
   8  *
   9  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
  10  *
  11  *  This program is free software; you can redistribute it and/or
  12  *  modify it under the terms of the GNU General Public License
  13  *  as published by the Free Software Foundation; either version
  14  *  2 of the License, or (at your option) any later version.
  15  *
  16  */
  17
  18 #include <linux/config.h>
  19 #include <linux/stddef.h>
  20 #include <linux/init.h>
  21 #include <linux/sched.h>
  22 #include <linux/signal.h>
  23 #include <linux/pci.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/sysdev.h>
  26 #include <linux/adb.h>
  27 #include <linux/pmu.h>
  28 #include <linux/module.h>
  29
  30 #include <asm/sections.h>
  31 #include <asm/io.h>
  32 #include <asm/smp.h>
  33 #include <asm/prom.h>
  34 #include <asm/pci-bridge.h>
  35 #include <asm/time.h>
  36 #include <asm/pmac_feature.h>
  37 #include <asm/mpic.h>
  38
  39 #include "pmac.h"
  40
  41 /*
  42  * XXX this should be in xmon.h, but putting it there means xmon.h
  43  * has to include <linux/interrupt.h> (to get irqreturn_t), which
  44  * causes all sorts of problems.  -- paulus
  45  */
  46 extern irqreturn_t xmon_irq(int, void *, struct pt_regs *);
  47
  48 #ifdef CONFIG_PPC32
  49 struct pmac_irq_hw {
  50         unsigned int    event;
  51         unsigned int    enable;
  52         unsigned int    ack;
  53         unsigned int    level;
  54 };
  55
  56 /* Default addresses */
  57 static volatile struct pmac_irq_hw *pmac_irq_hw[4] = {
  58         (struct pmac_irq_hw *) 0xf3000020,
  59         (struct pmac_irq_hw *) 0xf3000010,
  60         (struct pmac_irq_hw *) 0xf4000020,
  61         (struct pmac_irq_hw *) 0xf4000010,
  62 };
  63
  64 #define GC_LEVEL_MASK           0x3ff00000
  65 #define OHARE_LEVEL_MASK        0x1ff00000
  66 #define HEATHROW_LEVEL_MASK     0x1ff00000
  67
  68 static int max_irqs;
  69 static int max_real_irqs;
  70 static u32 level_mask[4];
  71
  72 static DEFINE_SPINLOCK(pmac_pic_lock);
  73
  74 #define GATWICK_IRQ_POOL_SIZE        10
  75 static struct interrupt_info gatwick_int_pool[GATWICK_IRQ_POOL_SIZE];
  76
  77 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
  78 static unsigned long ppc_lost_interrupts[NR_MASK_WORDS];
  79
  80 /*
  81  * Mark an irq as "lost".  This is only used on the pmac
  82  * since it can lose interrupts (see pmac_set_irq_mask).
  83  * -- Cort
  84  */
  85 void
  86 __set_lost(unsigned long irq_nr, int nokick)
  87 {
  88         if (!test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
  89                 atomic_inc(&ppc_n_lost_interrupts);
  90                 if (!nokick)
  91                         set_dec(1);
  92         }
  93 }
  94
  95 static void
  96 pmac_mask_and_ack_irq(unsigned int irq_nr)
  97 {
  98         unsigned long bit = 1UL << (irq_nr & 0x1f);
  99         int i = irq_nr >> 5;
 100         unsigned long flags;
 101
 102         if ((unsigned)irq_nr >= max_irqs)
 103                 return;
 104
 105         clear_bit(irq_nr, ppc_cached_irq_mask);
 106         if (test_and_clear_bit(irq_nr, ppc_lost_interrupts))
 107                 atomic_dec(&ppc_n_lost_interrupts);
 108         spin_lock_irqsave(&pmac_pic_lock, flags);
 109         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
 110         out_le32(&pmac_irq_hw[i]->ack, bit);
 111         do {
 112                 /* make sure ack gets to controller before we enable
 113                    interrupts */
 114                 mb();
 115         } while((in_le32(&pmac_irq_hw[i]->enable) & bit)
 116                 != (ppc_cached_irq_mask[i] & bit));
 117         spin_unlock_irqrestore(&pmac_pic_lock, flags);
 118 }
 119
 120 static void pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
 121 {
 122         unsigned long bit = 1UL << (irq_nr & 0x1f);
 123         int i = irq_nr >> 5;
 124         unsigned long flags;
 125
 126         if ((unsigned)irq_nr >= max_irqs)
 127                 return;
 128
 129         spin_lock_irqsave(&pmac_pic_lock, flags);
 130         /* enable unmasked interrupts */
 131         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
 132
 133         do {
 134                 /* make sure mask gets to controller before we
 135                    return to user */
 136                 mb();
 137         } while((in_le32(&pmac_irq_hw[i]->enable) & bit)
 138                 != (ppc_cached_irq_mask[i] & bit));
 139
 140         /*
 141          * Unfortunately, setting the bit in the enable register
 142          * when the device interrupt is already on *doesn't* set
 143          * the bit in the flag register or request another interrupt.
 144          */
 145         if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level))
 146                 __set_lost((ulong)irq_nr, nokicklost);
 147         spin_unlock_irqrestore(&pmac_pic_lock, flags);
 148 }
 149
 150 /* When an irq gets requested for the first client, if it's an
 151  * edge interrupt, we clear any previous one on the controller
 152  */
 153 static unsigned int pmac_startup_irq(unsigned int irq_nr)
 154 {
 155         unsigned long bit = 1UL << (irq_nr & 0x1f);
 156         int i = irq_nr >> 5;
 157
 158         if ((irq_desc[irq_nr].status & IRQ_LEVEL) == 0)
 159                 out_le32(&pmac_irq_hw[i]->ack, bit);
 160         set_bit(irq_nr, ppc_cached_irq_mask);
 161         pmac_set_irq_mask(irq_nr, 0);
 162
 163         return 0;
 164 }
 165
 166 static void pmac_mask_irq(unsigned int irq_nr)
 167 {
 168         clear_bit(irq_nr, ppc_cached_irq_mask);
 169         pmac_set_irq_mask(irq_nr, 0);
 170         mb();
 171 }
 172
 173 static void pmac_unmask_irq(unsigned int irq_nr)
 174 {
 175         set_bit(irq_nr, ppc_cached_irq_mask);
 176         pmac_set_irq_mask(irq_nr, 0);
 177 }
 178
 179 static void pmac_end_irq(unsigned int irq_nr)
 180 {
 181         if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
 182             && irq_desc[irq_nr].action) {
 183                 set_bit(irq_nr, ppc_cached_irq_mask);
 184                 pmac_set_irq_mask(irq_nr, 1);
 185         }
 186 }
 187
 188
 189 struct hw_interrupt_type pmac_pic = {
 190         .typename       = " PMAC-PIC ",
 191         .startup        = pmac_startup_irq,
 192         .enable         = pmac_unmask_irq,
 193         .disable        = pmac_mask_irq,
 194         .ack            = pmac_mask_and_ack_irq,
 195         .end            = pmac_end_irq,
 196 };
 197
 198 struct hw_interrupt_type gatwick_pic = {
 199         .typename       = " GATWICK  ",
 200         .startup        = pmac_startup_irq,
 201         .enable         = pmac_unmask_irq,
 202         .disable        = pmac_mask_irq,
 203         .ack            = pmac_mask_and_ack_irq,
 204         .end            = pmac_end_irq,
 205 };
 206
 207 static irqreturn_t gatwick_action(int cpl, void *dev_id, struct pt_regs *regs)
 208 {
 209         int irq, bits;
 210
 211         for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {
 212                 int i = irq >> 5;
 213                 bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
 214                 /* We must read level interrupts from the level register */
 215                 bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]);
 216                 bits &= ppc_cached_irq_mask[i];
 217                 if (bits == 0)
 218                         continue;
 219                 irq += __ilog2(bits);
 220                 __do_IRQ(irq, regs);
 221                 return IRQ_HANDLED;
 222         }
 223         printk("gatwick irq not from gatwick pic\n");
 224         return IRQ_NONE;
 225 }
 226
 227 int
 228 pmac_get_irq(struct pt_regs *regs)
 229 {
 230         int irq;
 231         unsigned long bits = 0;
 232
 233 #ifdef CONFIG_SMP
 234         void psurge_smp_message_recv(struct pt_regs *);
 235
 236         /* IPI's are a hack on the powersurge -- Cort */
 237         if ( smp_processor_id() != 0 ) {
 238                 psurge_smp_message_recv(regs);
 239                 return -2;      /* ignore, already handled */
 240         }
 241 #endif /* CONFIG_SMP */
 242         for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
 243                 int i = irq >> 5;
 244                 bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
 245                 /* We must read level interrupts from the level register */
 246                 bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]);
 247                 bits &= ppc_cached_irq_mask[i];
 248                 if (bits == 0)
 249                         continue;
 250                 irq += __ilog2(bits);
 251                 break;
 252         }
 253
 254         return irq;
 255 }
 256
 257 /* This routine will fix some missing interrupt values in the device tree
 258  * on the gatwick mac-io controller used by some PowerBooks
 259  */
 260 static void __init
 261 pmac_fix_gatwick_interrupts(struct device_node *gw, int irq_base)
 262 {
 263         struct device_node *node;
 264         int count;
 265
 266         memset(gatwick_int_pool, 0, sizeof(gatwick_int_pool));
 267         node = gw->child;
 268         count = 0;
 269         while(node)
 270         {
 271                 /* Fix SCC */
 272                 if (strcasecmp(node->name, "escc") == 0)
 273                         if (node->child) {
 274                                 if (node->child->n_intrs < 3) {
 275                                         node->child->intrs = &gatwick_int_pool[count];
 276                                         count += 3;
 277                                 }
 278                                 node->child->n_intrs = 3;
 279                                 node->child->intrs[0].line = 15+irq_base;
 280                                 node->child->intrs[1].line =  4+irq_base;
 281                                 node->child->intrs[2].line =  5+irq_base;
 282                                 printk(KERN_INFO "irq: fixed SCC on second controller (%d,%d,%d)\n",
 283                                         node->child->intrs[0].line,
 284                                         node->child->intrs[1].line,
 285                                         node->child->intrs[2].line);
 286                         }
 287                 /* Fix media-bay & left SWIM */
 288                 if (strcasecmp(node->name, "media-bay") == 0) {
 289                         struct device_node* ya_node;
 290
 291                         if (node->n_intrs == 0)
 292                                 node->intrs = &gatwick_int_pool[count++];
 293                         node->n_intrs = 1;
 294                         node->intrs[0].line = 29+irq_base;
 295                         printk(KERN_INFO "irq: fixed media-bay on second controller (%d)\n",
 296                                         node->intrs[0].line);
 297
 298                         ya_node = node->child;
 299                         while(ya_node)
 300                         {
 301                                 if (strcasecmp(ya_node->name, "floppy") == 0) {
 302                                         if (ya_node->n_intrs < 2) {
 303                                                 ya_node->intrs = &gatwick_int_pool[count];
 304                                                 count += 2;
 305                                         }
 306                                         ya_node->n_intrs = 2;
 307                                         ya_node->intrs[0].line = 19+irq_base;
 308                                         ya_node->intrs[1].line =  1+irq_base;
 309                                         printk(KERN_INFO "irq: fixed floppy on second controller (%d,%d)\n",
 310                                                 ya_node->intrs[0].line, ya_node->intrs[1].line);
 311                                 }
 312                                 if (strcasecmp(ya_node->name, "ata4") == 0) {
 313                                         if (ya_node->n_intrs < 2) {
 314                                                 ya_node->intrs = &gatwick_int_pool[count];
 315                                                 count += 2;
 316                                         }
 317                                         ya_node->n_intrs = 2;
 318                                         ya_node->intrs[0].line = 14+irq_base;
 319                                         ya_node->intrs[1].line =  3+irq_base;
 320                                         printk(KERN_INFO "irq: fixed ide on second controller (%d,%d)\n",
 321                                                 ya_node->intrs[0].line, ya_node->intrs[1].line);
 322                                 }
 323                                 ya_node = ya_node->sibling;
 324                         }
 325                 }
 326                 node = node->sibling;
 327         }
 328         if (count > 10) {
 329                 printk("WARNING !! Gatwick interrupt pool overflow\n");
 330                 printk("  GATWICK_IRQ_POOL_SIZE = %d\n", GATWICK_IRQ_POOL_SIZE);
 331                 printk("              requested = %d\n", count);
 332         }
 333 }
 334
 335 /*
 336  * The PowerBook 3400/2400/3500 can have a combo ethernet/modem
 337  * card which includes an ohare chip that acts as a second interrupt
 338  * controller.  If we find this second ohare, set it up and fix the
 339  * interrupt value in the device tree for the ethernet chip.
 340  */
 341 static int __init enable_second_ohare(void)
 342 {
 343         unsigned char bus, devfn;
 344         unsigned short cmd;
 345         unsigned long addr;
 346         struct device_node *irqctrler = find_devices("pci106b,7");
 347         struct device_node *ether;
 348
 349         if (irqctrler == NULL || irqctrler->n_addrs <= 0)
 350                 return -1;
 351         addr = (unsigned long) ioremap(irqctrler->addrs[0].address, 0x40);
 352         pmac_irq_hw[1] = (volatile struct pmac_irq_hw *)(addr + 0x20);
 353         max_irqs = 64;
 354         if (pci_device_from_OF_node(irqctrler, &bus, &devfn) == 0) {
 355                 struct pci_controller* hose = pci_find_hose_for_OF_device(irqctrler);
 356                 if (!hose)
 357                     printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
 358                 else {
 359                     early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
 360                     cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
 361                     cmd &= ~PCI_COMMAND_IO;
 362                     early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
 363                 }
 364         }
 365
 366         /* Fix interrupt for the modem/ethernet combo controller. The number
 367            in the device tree (27) is bogus (correct for the ethernet-only
 368            board but not the combo ethernet/modem board).
 369            The real interrupt is 28 on the second controller -> 28+32 = 60.
 370         */
 371         ether = find_devices("pci1011,14");
 372         if (ether && ether->n_intrs > 0) {
 373                 ether->intrs[0].line = 60;
 374                 printk(KERN_INFO "irq: Fixed ethernet IRQ to %d\n",
 375                        ether->intrs[0].line);
 376         }
 377
 378         /* Return the interrupt number of the cascade */
 379         return irqctrler->intrs[0].line;
 380 }
 381
 382 #ifdef CONFIG_XMON
 383 static struct irqaction xmon_action = {
 384         .handler        = xmon_irq,
 385         .flags          = 0,
 386         .mask           = CPU_MASK_NONE,
 387         .name           = "NMI - XMON"
 388 };
 389 #endif
 390
 391 static struct irqaction gatwick_cascade_action = {
 392         .handler        = gatwick_action,
 393         .flags          = SA_INTERRUPT,
 394         .mask           = CPU_MASK_NONE,
 395         .name           = "cascade",
 396 };
 397 #endif /* CONFIG_PPC32 */
 398
 399 static int pmac_u3_cascade(struct pt_regs *regs, void *data)
 400 {
 401         return mpic_get_one_irq((struct mpic *)data, regs);
 402 }
 403
 404 void __init pmac_pic_init(void)
 405 {
 406         struct device_node *irqctrler  = NULL;
 407         struct device_node *irqctrler2 = NULL;
 408         struct device_node *np;
 409 #ifdef CONFIG_PPC32
 410         int i;
 411         unsigned long addr;
 412         int irq_cascade = -1;
 413 #endif
 414         struct mpic *mpic1, *mpic2;
 415
 416         /* We first try to detect Apple's new Core99 chipset, since mac-io
 417          * is quite different on those machines and contains an IBM MPIC2.
 418          */
 419         np = find_type_devices("open-pic");
 420         while (np) {
 421                 if (np->parent && !strcmp(np->parent->name, "u3"))
 422                         irqctrler2 = np;
 423                 else
 424                         irqctrler = np;
 425                 np = np->next;
 426         }
 427         if (irqctrler != NULL && irqctrler->n_addrs > 0) {
 428                 unsigned char senses[128];
 429
 430                 printk(KERN_INFO "PowerMac using OpenPIC irq controller at 0x%08x\n",
 431                        (unsigned int)irqctrler->addrs[0].address);
 432                 pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler, 0, 0);
 433
 434                 prom_get_irq_senses(senses, 0, 128);
 435                 mpic1 = mpic_alloc(irqctrler->addrs[0].address,
 436                                    MPIC_PRIMARY | MPIC_WANTS_RESET,
 437                                    0, 0, 128, 252, senses, 128, " OpenPIC  ");
 438                 BUG_ON(mpic1 == NULL);
 439                 mpic_init(mpic1);
 440
 441                 if (irqctrler2 != NULL && irqctrler2->n_intrs > 0 &&
 442                     irqctrler2->n_addrs > 0) {
 443                         printk(KERN_INFO "Slave OpenPIC at 0x%08x hooked on IRQ %d\n",
 444                                (u32)irqctrler2->addrs[0].address,
 445                                irqctrler2->intrs[0].line);
 446
 447                         pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
 448                         prom_get_irq_senses(senses, 128, 128 + 124);
 449
 450                         /* We don't need to set MPIC_BROKEN_U3 here since we don't have
 451                          * hypertransport interrupts routed to it
 452                          */
 453                         mpic2 = mpic_alloc(irqctrler2->addrs[0].address,
 454                                            MPIC_BIG_ENDIAN | MPIC_WANTS_RESET,
 455                                            0, 128, 124, 0, senses, 124,
 456                                            " U3-MPIC  ");
 457                         BUG_ON(mpic2 == NULL);
 458                         mpic_init(mpic2);
 459                         mpic_setup_cascade(irqctrler2->intrs[0].line,
 460                                            pmac_u3_cascade, mpic2);
 461                 }
 462 #if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
 463                 {
 464                         struct device_node* pswitch;
 465                         int nmi_irq;
 466
 467                         pswitch = find_devices("programmer-switch");
 468                         if (pswitch && pswitch->n_intrs) {
 469                                 nmi_irq = pswitch->intrs[0].line;
 470                                 mpic_irq_set_priority(nmi_irq, 9);
 471                                 setup_irq(nmi_irq, &xmon_action);
 472                         }
 473                 }
 474 #endif  /* CONFIG_XMON */
 475                 return;
 476         }
 477         irqctrler = NULL;
 478
 479 #ifdef CONFIG_PPC32
 480         /* Get the level/edge settings, assume if it's not
 481          * a Grand Central nor an OHare, then it's an Heathrow
 482          * (or Paddington).
 483          */
 484         ppc_md.get_irq = pmac_get_irq;
 485         if (find_devices("gc"))
 486                 level_mask[0] = GC_LEVEL_MASK;
 487         else if (find_devices("ohare")) {
 488                 level_mask[0] = OHARE_LEVEL_MASK;
 489                 /* We might have a second cascaded ohare */
 490                 level_mask[1] = OHARE_LEVEL_MASK;
 491         } else {
 492                 level_mask[0] = HEATHROW_LEVEL_MASK;
 493                 level_mask[1] = 0;
 494                 /* We might have a second cascaded heathrow */
 495                 level_mask[2] = HEATHROW_LEVEL_MASK;
 496                 level_mask[3] = 0;
 497         }
 498
 499         /*
 500          * G3 powermacs and 1999 G3 PowerBooks have 64 interrupts,
 501          * 1998 G3 Series PowerBooks have 128,
 502          * other powermacs have 32.
 503          * The combo ethernet/modem card for the Powerstar powerbooks
 504          * (2400/3400/3500, ohare based) has a second ohare chip
 505          * effectively making a total of 64.
 506          */
 507         max_irqs = max_real_irqs = 32;
 508         irqctrler = find_devices("mac-io");
 509         if (irqctrler)
 510         {
 511                 max_real_irqs = 64;
 512                 if (irqctrler->next)
 513                         max_irqs = 128;
 514                 else
 515                         max_irqs = 64;
 516         }
 517         for ( i = 0; i < max_real_irqs ; i++ )
 518                 irq_desc[i].handler = &pmac_pic;
 519
 520         /* get addresses of first controller */
 521         if (irqctrler) {
 522                 if  (irqctrler->n_addrs > 0) {
 523                         addr = (unsigned long)
 524                                 ioremap(irqctrler->addrs[0].address, 0x40);
 525                         for (i = 0; i < 2; ++i)
 526                                 pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
 527                                         (addr + (2 - i) * 0x10);
 528                 }
 529
 530                 /* get addresses of second controller */
 531                 irqctrler = irqctrler->next;
 532                 if (irqctrler && irqctrler->n_addrs > 0) {
 533                         addr = (unsigned long)
 534                                 ioremap(irqctrler->addrs[0].address, 0x40);
 535                         for (i = 2; i < 4; ++i)
 536                                 pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
 537                                         (addr + (4 - i) * 0x10);
 538                         irq_cascade = irqctrler->intrs[0].line;
 539                         if (device_is_compatible(irqctrler, "gatwick"))
 540                                 pmac_fix_gatwick_interrupts(irqctrler, max_real_irqs);
 541                 }
 542         } else {
 543                 /* older powermacs have a GC (grand central) or ohare at
 544                    f3000000, with interrupt control registers at f3000020. */
 545                 addr = (unsigned long) ioremap(0xf3000000, 0x40);
 546                 pmac_irq_hw[0] = (volatile struct pmac_irq_hw *) (addr + 0x20);
 547         }
 548
 549         /* PowerBooks 3400 and 3500 can have a second controller in a second
 550            ohare chip, on the combo ethernet/modem card */
 551         if (machine_is_compatible("AAPL,3400/2400")
 552              || machine_is_compatible("AAPL,3500"))
 553                 irq_cascade = enable_second_ohare();
 554
 555         /* disable all interrupts in all controllers */
 556         for (i = 0; i * 32 < max_irqs; ++i)
 557                 out_le32(&pmac_irq_hw[i]->enable, 0);
 558         /* mark level interrupts */
 559         for (i = 0; i < max_irqs; i++)
 560                 if (level_mask[i >> 5] & (1UL << (i & 0x1f)))
 561                         irq_desc[i].status = IRQ_LEVEL;
 562
 563         /* get interrupt line of secondary interrupt controller */
 564         if (irq_cascade >= 0) {
 565                 printk(KERN_INFO "irq: secondary controller on irq %d\n",
 566                         (int)irq_cascade);
 567                 for ( i = max_real_irqs ; i < max_irqs ; i++ )
 568                         irq_desc[i].handler = &gatwick_pic;
 569                 setup_irq(irq_cascade, &gatwick_cascade_action);
 570         }
 571         printk("System has %d possible interrupts\n", max_irqs);
 572         if (max_irqs != max_real_irqs)
 573                 printk(KERN_DEBUG "%d interrupts on main controller\n",
 574                         max_real_irqs);
 575
 576 #ifdef CONFIG_XMON
 577         setup_irq(20, &xmon_action);
 578 #endif  /* CONFIG_XMON */
 579 #endif  /* CONFIG_PPC32 */
 580 }
 581
 582 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
 583 /*
 584  * These procedures are used in implementing sleep on the powerbooks.
 585  * sleep_save_intrs() saves the states of all interrupt enables
 586  * and disables all interrupts except for the nominated one.
 587  * sleep_restore_intrs() restores the states of all interrupt enables.
 588  */
 589 unsigned long sleep_save_mask[2];
 590
 591 /* This used to be passed by the PMU driver but that link got
 592  * broken with the new driver model. We use this tweak for now...
 593  */
 594 static int pmacpic_find_viaint(void)
 595 {
 596         int viaint = -1;
 597
 598 #ifdef CONFIG_ADB_PMU
 599         struct device_node *np;
 600
 601         if (pmu_get_model() != PMU_OHARE_BASED)
 602                 goto not_found;
 603         np = of_find_node_by_name(NULL, "via-pmu");
 604         if (np == NULL)
 605                 goto not_found;
 606         viaint = np->intrs[0].line;
 607 #endif /* CONFIG_ADB_PMU */
 608
 609 not_found:
 610         return viaint;
 611 }
 612
 613 static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state)
 614 {
 615         int viaint = pmacpic_find_viaint();
 616
 617         sleep_save_mask[0] = ppc_cached_irq_mask[0];
 618         sleep_save_mask[1] = ppc_cached_irq_mask[1];
 619         ppc_cached_irq_mask[0] = 0;
 620         ppc_cached_irq_mask[1] = 0;
 621         if (viaint > 0)
 622                 set_bit(viaint, ppc_cached_irq_mask);
 623         out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);
 624         if (max_real_irqs > 32)
 625                 out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);
 626         (void)in_le32(&pmac_irq_hw[0]->event);
 627         /* make sure mask gets to controller before we return to caller */
 628         mb();
 629         (void)in_le32(&pmac_irq_hw[0]->enable);
 630
 631         return 0;
 632 }
 633
 634 static int pmacpic_resume(struct sys_device *sysdev)
 635 {
 636         int i;
 637
 638         out_le32(&pmac_irq_hw[0]->enable, 0);
 639         if (max_real_irqs > 32)
 640                 out_le32(&pmac_irq_hw[1]->enable, 0);
 641         mb();
 642         for (i = 0; i < max_real_irqs; ++i)
 643                 if (test_bit(i, sleep_save_mask))
 644                         pmac_unmask_irq(i);
 645
 646         return 0;
 647 }
 648
 649 #endif /* CONFIG_PM && CONFIG_PPC32 */
 650
 651 static struct sysdev_class pmacpic_sysclass = {
 652         set_kset_name("pmac_pic"),
 653 };
 654
 655 static struct sys_device device_pmacpic = {
 656         .id             = 0,
 657         .cls            = &pmacpic_sysclass,
 658 };
 659
 660 static struct sysdev_driver driver_pmacpic = {
 661 #if defined(CONFIG_PM) && defined(CONFIG_PPC32)
 662         .suspend        = &pmacpic_suspend,
 663         .resume         = &pmacpic_resume,
 664 #endif /* CONFIG_PM && CONFIG_PPC32 */
 665 };
 666
 667 static int __init init_pmacpic_sysfs(void)
 668 {
 669 #ifdef CONFIG_PPC32
 670         if (max_irqs == 0)
 671                 return -ENODEV;
 672 #endif
 673         printk(KERN_DEBUG "Registering pmac pic with sysfs...\n");
 674         sysdev_class_register(&pmacpic_sysclass);
 675         sysdev_register(&device_pmacpic);
 676         sysdev_driver_register(&pmacpic_sysclass, &driver_pmacpic);
 677         return 0;
 678 }
 679
 680 subsys_initcall(init_pmacpic_sysfs);
 681