arch/ppc/syslib/open_pic2.c

   1 /*
   2  *  Copyright (C) 1997 Geert Uytterhoeven
   3  *
   4  *  This file is subject to the terms and conditions of the GNU General Public
   5  *  License.  See the file COPYING in the main directory of this archive
   6  *  for more details.
   7  *
   8  *  This is a duplicate of open_pic.c that deals with U3s MPIC on
   9  *  G5 PowerMacs. It's the same file except it's using big endian
  10  *  register accesses
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched.h>
  17 #include <linux/init.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/sysdev.h>
  20 #include <linux/errno.h>
  21 #include <asm/ptrace.h>
  22 #include <asm/signal.h>
  23 #include <asm/io.h>
  24 #include <asm/irq.h>
  25 #include <asm/sections.h>
  26 #include <asm/open_pic.h>
  27 #include <asm/i8259.h>
  28 #include <asm/machdep.h>
  29
  30 #include "open_pic_defs.h"
  31
  32 void *OpenPIC2_Addr;
  33 static volatile struct OpenPIC *OpenPIC2 = NULL;
  34 /*
  35  * We define OpenPIC_InitSenses table thusly:
  36  * bit 0x1: sense, 0 for edge and 1 for level.
  37  * bit 0x2: polarity, 0 for negative, 1 for positive.
  38  */
  39 extern  u_int OpenPIC_NumInitSenses;
  40 extern u_char *OpenPIC_InitSenses;
  41 extern int use_of_interrupt_tree;
  42
  43 static u_int NumProcessors;
  44 static u_int NumSources;
  45 static int open_pic2_irq_offset;
  46 static volatile OpenPIC_Source *ISR[NR_IRQS];
  47
  48 /* Global Operations */
  49 static void openpic2_disable_8259_pass_through(void);
  50 static void openpic2_set_priority(u_int pri);
  51 static void openpic2_set_spurious(u_int vector);
  52
  53 /* Timer Interrupts */
  54 static void openpic2_inittimer(u_int timer, u_int pri, u_int vector);
  55 static void openpic2_maptimer(u_int timer, u_int cpumask);
  56
  57 /* Interrupt Sources */
  58 static void openpic2_enable_irq(u_int irq);
  59 static void openpic2_disable_irq(u_int irq);
  60 static void openpic2_initirq(u_int irq, u_int pri, u_int vector, int polarity,
  61                             int is_level);
  62 static void openpic2_mapirq(u_int irq, u_int cpumask, u_int keepmask);
  63
  64 /*
  65  * These functions are not used but the code is kept here
  66  * for completeness and future reference.
  67  */
  68 static void openpic2_reset(void);
  69 #ifdef notused
  70 static void openpic2_enable_8259_pass_through(void);
  71 static u_int openpic2_get_priority(void);
  72 static u_int openpic2_get_spurious(void);
  73 static void openpic2_set_sense(u_int irq, int sense);
  74 #endif /* notused */
  75
  76 /*
  77  * Description of the openpic for the higher-level irq code
  78  */
  79 static void openpic2_end_irq(unsigned int irq_nr);
  80 static void openpic2_ack_irq(unsigned int irq_nr);
  81
  82 struct hw_interrupt_type open_pic2 = {
  83         .typename = " OpenPIC2 ",
  84         .enable = openpic2_enable_irq,
  85         .disable = openpic2_disable_irq,
  86         .ack = openpic2_ack_irq,
  87         .end = openpic2_end_irq,
  88 };
  89
  90 /*
  91  *  Accesses to the current processor's openpic registers
  92  *  On cascaded controller, this is only CPU 0
  93  */
  94 #define THIS_CPU                Processor[0]
  95 #define DECL_THIS_CPU
  96 #define CHECK_THIS_CPU
  97
  98 #if 1
  99 #define check_arg_ipi(ipi) \
 100     if (ipi < 0 || ipi >= OPENPIC_NUM_IPI) \
 101         printk("open_pic.c:%d: illegal ipi %d\n", __LINE__, ipi);
 102 #define check_arg_timer(timer) \
 103     if (timer < 0 || timer >= OPENPIC_NUM_TIMERS) \
 104         printk("open_pic.c:%d: illegal timer %d\n", __LINE__, timer);
 105 #define check_arg_vec(vec) \
 106     if (vec < 0 || vec >= OPENPIC_NUM_VECTORS) \
 107         printk("open_pic.c:%d: illegal vector %d\n", __LINE__, vec);
 108 #define check_arg_pri(pri) \
 109     if (pri < 0 || pri >= OPENPIC_NUM_PRI) \
 110         printk("open_pic.c:%d: illegal priority %d\n", __LINE__, pri);
 111 /*
 112  * Print out a backtrace if it's out of range, since if it's larger than NR_IRQ's
 113  * data has probably been corrupted and we're going to panic or deadlock later
 114  * anyway --Troy
 115  */
 116 extern unsigned long* _get_SP(void);
 117 #define check_arg_irq(irq) \
 118     if (irq < open_pic2_irq_offset || irq >= NumSources+open_pic2_irq_offset \
 119         || ISR[irq - open_pic2_irq_offset] == 0) { \
 120       printk("open_pic.c:%d: illegal irq %d\n", __LINE__, irq); \
 121       /*print_backtrace(_get_SP());*/ }
 122 #define check_arg_cpu(cpu) \
 123     if (cpu < 0 || cpu >= NumProcessors){ \
 124         printk("open_pic2.c:%d: illegal cpu %d\n", __LINE__, cpu); \
 125         /*print_backtrace(_get_SP());*/ }
 126 #else
 127 #define check_arg_ipi(ipi)      do {} while (0)
 128 #define check_arg_timer(timer)  do {} while (0)
 129 #define check_arg_vec(vec)      do {} while (0)
 130 #define check_arg_pri(pri)      do {} while (0)
 131 #define check_arg_irq(irq)      do {} while (0)
 132 #define check_arg_cpu(cpu)      do {} while (0)
 133 #endif
 134
 135 static u_int openpic2_read(volatile u_int *addr)
 136 {
 137         u_int val;
 138
 139         val = in_be32(addr);
 140         return val;
 141 }
 142
 143 static inline void openpic2_write(volatile u_int *addr, u_int val)
 144 {
 145         out_be32(addr, val);
 146 }
 147
 148 static inline u_int openpic2_readfield(volatile u_int *addr, u_int mask)
 149 {
 150         u_int val = openpic2_read(addr);
 151         return val & mask;
 152 }
 153
 154 inline void openpic2_writefield(volatile u_int *addr, u_int mask,
 155                                u_int field)
 156 {
 157         u_int val = openpic2_read(addr);
 158         openpic2_write(addr, (val & ~mask) | (field & mask));
 159 }
 160
 161 static inline void openpic2_clearfield(volatile u_int *addr, u_int mask)
 162 {
 163         openpic2_writefield(addr, mask, 0);
 164 }
 165
 166 static inline void openpic2_setfield(volatile u_int *addr, u_int mask)
 167 {
 168         openpic2_writefield(addr, mask, mask);
 169 }
 170
 171 static void openpic2_safe_writefield(volatile u_int *addr, u_int mask,
 172                                     u_int field)
 173 {
 174         openpic2_setfield(addr, OPENPIC_MASK);
 175         while (openpic2_read(addr) & OPENPIC_ACTIVITY);
 176         openpic2_writefield(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK);
 177 }
 178
 179 static void openpic2_reset(void)
 180 {
 181         openpic2_setfield(&OpenPIC2->Global.Global_Configuration0,
 182                          OPENPIC_CONFIG_RESET);
 183         while (openpic2_readfield(&OpenPIC2->Global.Global_Configuration0,
 184                                  OPENPIC_CONFIG_RESET))
 185                 mb();
 186 }
 187
 188 void __init openpic2_set_sources(int first_irq, int num_irqs, void *first_ISR)
 189 {
 190         volatile OpenPIC_Source *src = first_ISR;
 191         int i, last_irq;
 192
 193         last_irq = first_irq + num_irqs;
 194         if (last_irq > NumSources)
 195                 NumSources = last_irq;
 196         if (src == 0)
 197                 src = &((struct OpenPIC *)OpenPIC2_Addr)->Source[first_irq];
 198         for (i = first_irq; i < last_irq; ++i, ++src)
 199                 ISR[i] = src;
 200 }
 201
 202 /*
 203  * The `offset' parameter defines where the interrupts handled by the
 204  * OpenPIC start in the space of interrupt numbers that the kernel knows
 205  * about.  In other words, the OpenPIC's IRQ0 is numbered `offset' in the
 206  * kernel's interrupt numbering scheme.
 207  * We assume there is only one OpenPIC.
 208  */
 209 void __init openpic2_init(int offset)
 210 {
 211         u_int t, i;
 212         u_int timerfreq;
 213         const char *version;
 214
 215         if (!OpenPIC2_Addr) {
 216                 printk("No OpenPIC2 found !\n");
 217                 return;
 218         }
 219         OpenPIC2 = (volatile struct OpenPIC *)OpenPIC2_Addr;
 220
 221         if (ppc_md.progress) ppc_md.progress("openpic: enter", 0x122);
 222
 223         t = openpic2_read(&OpenPIC2->Global.Feature_Reporting0);
 224         switch (t & OPENPIC_FEATURE_VERSION_MASK) {
 225         case 1:
 226                 version = "1.0";
 227                 break;
 228         case 2:
 229                 version = "1.2";
 230                 break;
 231         case 3:
 232                 version = "1.3";
 233                 break;
 234         default:
 235                 version = "?";
 236                 break;
 237         }
 238         NumProcessors = ((t & OPENPIC_FEATURE_LAST_PROCESSOR_MASK) >>
 239                          OPENPIC_FEATURE_LAST_PROCESSOR_SHIFT) + 1;
 240         if (NumSources == 0)
 241                 openpic2_set_sources(0,
 242                                     ((t & OPENPIC_FEATURE_LAST_SOURCE_MASK) >>
 243                                      OPENPIC_FEATURE_LAST_SOURCE_SHIFT) + 1,
 244                                     NULL);
 245         printk("OpenPIC (2) Version %s (%d CPUs and %d IRQ sources) at %p\n",
 246                version, NumProcessors, NumSources, OpenPIC2);
 247         timerfreq = openpic2_read(&OpenPIC2->Global.Timer_Frequency);
 248         if (timerfreq)
 249                 printk("OpenPIC timer frequency is %d.%06d MHz\n",
 250                        timerfreq / 1000000, timerfreq % 1000000);
 251
 252         open_pic2_irq_offset = offset;
 253
 254         /* Initialize timer interrupts */
 255         if ( ppc_md.progress ) ppc_md.progress("openpic2: timer",0x3ba);
 256         for (i = 0; i < OPENPIC_NUM_TIMERS; i++) {
 257                 /* Disabled, Priority 0 */
 258                 openpic2_inittimer(i, 0, OPENPIC2_VEC_TIMER+i+offset);
 259                 /* No processor */
 260                 openpic2_maptimer(i, 0);
 261         }
 262
 263         /* Initialize external interrupts */
 264         if (ppc_md.progress) ppc_md.progress("openpic2: external",0x3bc);
 265
 266         openpic2_set_priority(0xf);
 267
 268         /* Init all external sources, including possibly the cascade. */
 269         for (i = 0; i < NumSources; i++) {
 270                 int sense;
 271
 272                 if (ISR[i] == 0)
 273                         continue;
 274
 275                 /* the bootloader may have left it enabled (bad !) */
 276                 openpic2_disable_irq(i+offset);
 277
 278                 sense = (i < OpenPIC_NumInitSenses)? OpenPIC_InitSenses[i]: \
 279                                 (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE);
 280
 281                 if (sense & IRQ_SENSE_MASK)
 282                         irq_desc[i+offset].status = IRQ_LEVEL;
 283
 284                 /* Enabled, Priority 8 */
 285                 openpic2_initirq(i, 8, i+offset, (sense & IRQ_POLARITY_MASK),
 286                                 (sense & IRQ_SENSE_MASK));
 287                 /* Processor 0 */
 288                 openpic2_mapirq(i, 1<<0, 0);
 289         }
 290
 291         /* Init descriptors */
 292         for (i = offset; i < NumSources + offset; i++)
 293                 irq_desc[i].handler = &open_pic2;
 294
 295         /* Initialize the spurious interrupt */
 296         if (ppc_md.progress) ppc_md.progress("openpic2: spurious",0x3bd);
 297         openpic2_set_spurious(OPENPIC2_VEC_SPURIOUS+offset);
 298
 299         openpic2_disable_8259_pass_through();
 300         openpic2_set_priority(0);
 301
 302         if (ppc_md.progress) ppc_md.progress("openpic2: exit",0x222);
 303 }
 304
 305 #ifdef notused
 306 static void openpic2_enable_8259_pass_through(void)
 307 {
 308         openpic2_clearfield(&OpenPIC2->Global.Global_Configuration0,
 309                            OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
 310 }
 311 #endif /* notused */
 312
 313 /* This can't be __init, it is used in openpic_sleep_restore_intrs */
 314 static void openpic2_disable_8259_pass_through(void)
 315 {
 316         openpic2_setfield(&OpenPIC2->Global.Global_Configuration0,
 317                          OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
 318 }
 319
 320 /*
 321  *  Find out the current interrupt
 322  */
 323 u_int openpic2_irq(void)
 324 {
 325         u_int vec;
 326         DECL_THIS_CPU;
 327
 328         CHECK_THIS_CPU;
 329         vec = openpic2_readfield(&OpenPIC2->THIS_CPU.Interrupt_Acknowledge,
 330                                 OPENPIC_VECTOR_MASK);
 331         return vec;
 332 }
 333
 334 void openpic2_eoi(void)
 335 {
 336         DECL_THIS_CPU;
 337
 338         CHECK_THIS_CPU;
 339         openpic2_write(&OpenPIC2->THIS_CPU.EOI, 0);
 340         /* Handle PCI write posting */
 341         (void)openpic2_read(&OpenPIC2->THIS_CPU.EOI);
 342 }
 343
 344 #ifdef notused
 345 static u_int openpic2_get_priority(void)
 346 {
 347         DECL_THIS_CPU;
 348
 349         CHECK_THIS_CPU;
 350         return openpic2_readfield(&OpenPIC2->THIS_CPU.Current_Task_Priority,
 351                                  OPENPIC_CURRENT_TASK_PRIORITY_MASK);
 352 }
 353 #endif /* notused */
 354
 355 static void __init openpic2_set_priority(u_int pri)
 356 {
 357         DECL_THIS_CPU;
 358
 359         CHECK_THIS_CPU;
 360         check_arg_pri(pri);
 361         openpic2_writefield(&OpenPIC2->THIS_CPU.Current_Task_Priority,
 362                            OPENPIC_CURRENT_TASK_PRIORITY_MASK, pri);
 363 }
 364
 365 /*
 366  *  Get/set the spurious vector
 367  */
 368 #ifdef notused
 369 static u_int openpic2_get_spurious(void)
 370 {
 371         return openpic2_readfield(&OpenPIC2->Global.Spurious_Vector,
 372                                  OPENPIC_VECTOR_MASK);
 373 }
 374 #endif /* notused */
 375
 376 /* This can't be __init, it is used in openpic_sleep_restore_intrs */
 377 static void openpic2_set_spurious(u_int vec)
 378 {
 379         check_arg_vec(vec);
 380         openpic2_writefield(&OpenPIC2->Global.Spurious_Vector, OPENPIC_VECTOR_MASK,
 381                            vec);
 382 }
 383
 384 static DEFINE_SPINLOCK(openpic2_setup_lock);
 385
 386 /*
 387  *  Initialize a timer interrupt (and disable it)
 388  *
 389  *  timer: OpenPIC timer number
 390  *  pri: interrupt source priority
 391  *  vec: the vector it will produce
 392  */
 393 static void __init openpic2_inittimer(u_int timer, u_int pri, u_int vec)
 394 {
 395         check_arg_timer(timer);
 396         check_arg_pri(pri);
 397         check_arg_vec(vec);
 398         openpic2_safe_writefield(&OpenPIC2->Global.Timer[timer].Vector_Priority,
 399                                 OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK,
 400                                 (pri << OPENPIC_PRIORITY_SHIFT) | vec);
 401 }
 402
 403 /*
 404  *  Map a timer interrupt to one or more CPUs
 405  */
 406 static void __init openpic2_maptimer(u_int timer, u_int cpumask)
 407 {
 408         check_arg_timer(timer);
 409         openpic2_write(&OpenPIC2->Global.Timer[timer].Destination,
 410                       cpumask);
 411 }
 412
 413 /*
 414  * Initalize the interrupt source which will generate an NMI.
 415  * This raises the interrupt's priority from 8 to 9.
 416  *
 417  * irq: The logical IRQ which generates an NMI.
 418  */
 419 void __init
 420 openpic2_init_nmi_irq(u_int irq)
 421 {
 422         check_arg_irq(irq);
 423         openpic2_safe_writefield(&ISR[irq - open_pic2_irq_offset]->Vector_Priority,
 424                                 OPENPIC_PRIORITY_MASK,
 425                                 9 << OPENPIC_PRIORITY_SHIFT);
 426 }
 427
 428 /*
 429  *
 430  * All functions below take an offset'ed irq argument
 431  *
 432  */
 433
 434
 435 /*
 436  *  Enable/disable an external interrupt source
 437  *
 438  *  Externally called, irq is an offseted system-wide interrupt number
 439  */
 440 static void openpic2_enable_irq(u_int irq)
 441 {
 442         volatile u_int *vpp;
 443
 444         check_arg_irq(irq);
 445         vpp = &ISR[irq - open_pic2_irq_offset]->Vector_Priority;
 446         openpic2_clearfield(vpp, OPENPIC_MASK);
 447         /* make sure mask gets to controller before we return to user */
 448         do {
 449                 mb(); /* sync is probably useless here */
 450         } while (openpic2_readfield(vpp, OPENPIC_MASK));
 451 }
 452
 453 static void openpic2_disable_irq(u_int irq)
 454 {
 455         volatile u_int *vpp;
 456         u32 vp;
 457
 458         check_arg_irq(irq);
 459         vpp = &ISR[irq - open_pic2_irq_offset]->Vector_Priority;
 460         openpic2_setfield(vpp, OPENPIC_MASK);
 461         /* make sure mask gets to controller before we return to user */
 462         do {
 463                 mb();  /* sync is probably useless here */
 464                 vp = openpic2_readfield(vpp, OPENPIC_MASK | OPENPIC_ACTIVITY);
 465         } while((vp & OPENPIC_ACTIVITY) && !(vp & OPENPIC_MASK));
 466 }
 467
 468
 469 /*
 470  *  Initialize an interrupt source (and disable it!)
 471  *
 472  *  irq: OpenPIC interrupt number
 473  *  pri: interrupt source priority
 474  *  vec: the vector it will produce
 475  *  pol: polarity (1 for positive, 0 for negative)
 476  *  sense: 1 for level, 0 for edge
 477  */
 478 static void __init
 479 openpic2_initirq(u_int irq, u_int pri, u_int vec, int pol, int sense)
 480 {
 481         openpic2_safe_writefield(&ISR[irq]->Vector_Priority,
 482                                 OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK |
 483                                 OPENPIC_SENSE_MASK | OPENPIC_POLARITY_MASK,
 484                                 (pri << OPENPIC_PRIORITY_SHIFT) | vec |
 485                                 (pol ? OPENPIC_POLARITY_POSITIVE :
 486                                         OPENPIC_POLARITY_NEGATIVE) |
 487                                 (sense ? OPENPIC_SENSE_LEVEL : OPENPIC_SENSE_EDGE));
 488 }
 489
 490 /*
 491  *  Map an interrupt source to one or more CPUs
 492  */
 493 static void openpic2_mapirq(u_int irq, u_int physmask, u_int keepmask)
 494 {
 495         if (ISR[irq] == 0)
 496                 return;
 497         if (keepmask != 0)
 498                 physmask |= openpic2_read(&ISR[irq]->Destination) & keepmask;
 499         openpic2_write(&ISR[irq]->Destination, physmask);
 500 }
 501
 502 #ifdef notused
 503 /*
 504  *  Set the sense for an interrupt source (and disable it!)
 505  *
 506  *  sense: 1 for level, 0 for edge
 507  */
 508 static void openpic2_set_sense(u_int irq, int sense)
 509 {
 510         if (ISR[irq] != 0)
 511                 openpic2_safe_writefield(&ISR[irq]->Vector_Priority,
 512                                         OPENPIC_SENSE_LEVEL,
 513                                         (sense ? OPENPIC_SENSE_LEVEL : 0));
 514 }
 515 #endif /* notused */
 516
 517 /* No spinlocks, should not be necessary with the OpenPIC
 518  * (1 register = 1 interrupt and we have the desc lock).
 519  */
 520 static void openpic2_ack_irq(unsigned int irq_nr)
 521 {
 522         openpic2_disable_irq(irq_nr);
 523         openpic2_eoi();
 524 }
 525
 526 static void openpic2_end_irq(unsigned int irq_nr)
 527 {
 528         if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 529                 openpic2_enable_irq(irq_nr);
 530 }
 531
 532 int
 533 openpic2_get_irq(struct pt_regs *regs)
 534 {
 535         int irq = openpic2_irq();
 536
 537         if (irq == (OPENPIC2_VEC_SPURIOUS + open_pic2_irq_offset))
 538                 irq = -1;
 539         return irq;
 540 }
 541
 542 #ifdef CONFIG_PM
 543
 544 /*
 545  * We implement the IRQ controller as a sysdev and put it
 546  * to sleep at powerdown stage (the callback is named suspend,
 547  * but it's old semantics, for the Device Model, it's really
 548  * powerdown). The possible problem is that another sysdev that
 549  * happens to be suspend after this one will have interrupts off,
 550  * that may be an issue... For now, this isn't an issue on pmac
 551  * though...
 552  */
 553
 554 static u32 save_ipi_vp[OPENPIC_NUM_IPI];
 555 static u32 save_irq_src_vp[OPENPIC_MAX_SOURCES];
 556 static u32 save_irq_src_dest[OPENPIC_MAX_SOURCES];
 557 static u32 save_cpu_task_pri[OPENPIC_MAX_PROCESSORS];
 558 static int openpic_suspend_count;
 559
 560 static void openpic2_cached_enable_irq(u_int irq)
 561 {
 562         check_arg_irq(irq);
 563         save_irq_src_vp[irq - open_pic2_irq_offset] &= ~OPENPIC_MASK;
 564 }
 565
 566 static void openpic2_cached_disable_irq(u_int irq)
 567 {
 568         check_arg_irq(irq);
 569         save_irq_src_vp[irq - open_pic2_irq_offset] |= OPENPIC_MASK;
 570 }
 571
 572 /* WARNING: Can be called directly by the cpufreq code with NULL parameter,
 573  * we need something better to deal with that... Maybe switch to S1 for
 574  * cpufreq changes
 575  */
 576 int openpic2_suspend(struct sys_device *sysdev, pm_message_t state)
 577 {
 578         int     i;
 579         unsigned long flags;
 580
 581         spin_lock_irqsave(&openpic2_setup_lock, flags);
 582
 583         if (openpic_suspend_count++ > 0) {
 584                 spin_unlock_irqrestore(&openpic2_setup_lock, flags);
 585                 return 0;
 586         }
 587
 588         open_pic2.enable = openpic2_cached_enable_irq;
 589         open_pic2.disable = openpic2_cached_disable_irq;
 590
 591         for (i=0; i<NumProcessors; i++) {
 592                 save_cpu_task_pri[i] = openpic2_read(&OpenPIC2->Processor[i].Current_Task_Priority);
 593                 openpic2_writefield(&OpenPIC2->Processor[i].Current_Task_Priority,
 594                                    OPENPIC_CURRENT_TASK_PRIORITY_MASK, 0xf);
 595         }
 596
 597         for (i=0; i<OPENPIC_NUM_IPI; i++)
 598                 save_ipi_vp[i] = openpic2_read(&OpenPIC2->Global.IPI_Vector_Priority(i));
 599         for (i=0; i<NumSources; i++) {
 600                 if (ISR[i] == 0)
 601                         continue;
 602                 save_irq_src_vp[i] = openpic2_read(&ISR[i]->Vector_Priority) & ~OPENPIC_ACTIVITY;
 603                 save_irq_src_dest[i] = openpic2_read(&ISR[i]->Destination);
 604         }
 605
 606         spin_unlock_irqrestore(&openpic2_setup_lock, flags);
 607
 608         return 0;
 609 }
 610
 611 /* WARNING: Can be called directly by the cpufreq code with NULL parameter,
 612  * we need something better to deal with that... Maybe switch to S1 for
 613  * cpufreq changes
 614  */
 615 int openpic2_resume(struct sys_device *sysdev)
 616 {
 617         int             i;
 618         unsigned long   flags;
 619         u32             vppmask =       OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK |
 620                                         OPENPIC_SENSE_MASK | OPENPIC_POLARITY_MASK |
 621                                         OPENPIC_MASK;
 622
 623         spin_lock_irqsave(&openpic2_setup_lock, flags);
 624
 625         if ((--openpic_suspend_count) > 0) {
 626                 spin_unlock_irqrestore(&openpic2_setup_lock, flags);
 627                 return 0;
 628         }
 629
 630         openpic2_reset();
 631
 632         /* OpenPIC sometimes seem to need some time to be fully back up... */
 633         do {
 634                 openpic2_set_spurious(OPENPIC2_VEC_SPURIOUS+open_pic2_irq_offset);
 635         } while(openpic2_readfield(&OpenPIC2->Global.Spurious_Vector, OPENPIC_VECTOR_MASK)
 636                         != (OPENPIC2_VEC_SPURIOUS + open_pic2_irq_offset));
 637
 638         openpic2_disable_8259_pass_through();
 639
 640         for (i=0; i<OPENPIC_NUM_IPI; i++)
 641                 openpic2_write(&OpenPIC2->Global.IPI_Vector_Priority(i),
 642                               save_ipi_vp[i]);
 643         for (i=0; i<NumSources; i++) {
 644                 if (ISR[i] == 0)
 645                         continue;
 646                 openpic2_write(&ISR[i]->Destination, save_irq_src_dest[i]);
 647                 openpic2_write(&ISR[i]->Vector_Priority, save_irq_src_vp[i]);
 648                 /* make sure mask gets to controller before we return to user */
 649                 do {
 650                         openpic2_write(&ISR[i]->Vector_Priority, save_irq_src_vp[i]);
 651                 } while (openpic2_readfield(&ISR[i]->Vector_Priority, vppmask)
 652                          != (save_irq_src_vp[i] & vppmask));
 653         }
 654         for (i=0; i<NumProcessors; i++)
 655                 openpic2_write(&OpenPIC2->Processor[i].Current_Task_Priority,
 656                               save_cpu_task_pri[i]);
 657
 658         open_pic2.enable = openpic2_enable_irq;
 659         open_pic2.disable = openpic2_disable_irq;
 660
 661         spin_unlock_irqrestore(&openpic2_setup_lock, flags);
 662
 663         return 0;
 664 }
 665
 666 #endif /* CONFIG_PM */
 667
 668 /* HACK ALERT */
 669 static struct sysdev_class openpic2_sysclass = {
 670         set_kset_name("openpic2"),
 671 };
 672
 673 static struct sys_device device_openpic2 = {
 674         .id             = 0,
 675         .cls            = &openpic2_sysclass,
 676 };
 677
 678 static struct sysdev_driver driver_openpic2 = {
 679 #ifdef CONFIG_PM
 680         .suspend        = &openpic2_suspend,
 681         .resume         = &openpic2_resume,
 682 #endif /* CONFIG_PM */
 683 };
 684
 685 static int __init init_openpic2_sysfs(void)
 686 {
 687         int rc;
 688
 689         if (!OpenPIC2_Addr)
 690                 return -ENODEV;
 691         printk(KERN_DEBUG "Registering openpic2 with sysfs...\n");
 692         rc = sysdev_class_register(&openpic2_sysclass);
 693         if (rc) {
 694                 printk(KERN_ERR "Failed registering openpic sys class\n");
 695                 return -ENODEV;
 696         }
 697         rc = sysdev_register(&device_openpic2);
 698         if (rc) {
 699                 printk(KERN_ERR "Failed registering openpic sys device\n");
 700                 return -ENODEV;
 701         }
 702         rc = sysdev_driver_register(&openpic2_sysclass, &driver_openpic2);
 703         if (rc) {
 704                 printk(KERN_ERR "Failed registering openpic sys driver\n");
 705                 return -ENODEV;
 706         }
 707         return 0;
 708 }
 709
 710 subsys_initcall(init_openpic2_sysfs);
 711