arch/powerpc/sysdev/ipic.c

   1 /*
   2  * arch/powerpc/sysdev/ipic.c
   3  *
   4  * IPIC routines implementations.
   5  *
   6  * Copyright 2005 Freescale Semiconductor, Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/reboot.h>
  17 #include <linux/slab.h>
  18 #include <linux/stddef.h>
  19 #include <linux/sched.h>
  20 #include <linux/signal.h>
  21 #include <linux/sysdev.h>
  22 #include <linux/device.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/spinlock.h>
  25 #include <asm/irq.h>
  26 #include <asm/io.h>
  27 #include <asm/prom.h>
  28 #include <asm/ipic.h>
  29
  30 #include "ipic.h"
  31
  32 static struct ipic * primary_ipic;
  33 static struct irq_chip ipic_level_irq_chip, ipic_edge_irq_chip;
  34 static DEFINE_SPINLOCK(ipic_lock);
  35
  36 static struct ipic_info ipic_info[] = {
  37         [1] = {
  38                 .mask   = IPIC_SIMSR_H,
  39                 .prio   = IPIC_SIPRR_C,
  40                 .force  = IPIC_SIFCR_H,
  41                 .bit    = 16,
  42                 .prio_mask = 0,
  43         },
  44         [2] = {
  45                 .mask   = IPIC_SIMSR_H,
  46                 .prio   = IPIC_SIPRR_C,
  47                 .force  = IPIC_SIFCR_H,
  48                 .bit    = 17,
  49                 .prio_mask = 1,
  50         },
  51         [3] = {
  52                 .mask   = IPIC_SIMSR_H,
  53                 .prio   = IPIC_SIPRR_C,
  54                 .force  = IPIC_SIFCR_H,
  55                 .bit    = 18,
  56                 .prio_mask = 2,
  57         },
  58         [4] = {
  59                 .mask   = IPIC_SIMSR_H,
  60                 .prio   = IPIC_SIPRR_C,
  61                 .force  = IPIC_SIFCR_H,
  62                 .bit    = 19,
  63                 .prio_mask = 3,
  64         },
  65         [5] = {
  66                 .mask   = IPIC_SIMSR_H,
  67                 .prio   = IPIC_SIPRR_C,
  68                 .force  = IPIC_SIFCR_H,
  69                 .bit    = 20,
  70                 .prio_mask = 4,
  71         },
  72         [6] = {
  73                 .mask   = IPIC_SIMSR_H,
  74                 .prio   = IPIC_SIPRR_C,
  75                 .force  = IPIC_SIFCR_H,
  76                 .bit    = 21,
  77                 .prio_mask = 5,
  78         },
  79         [7] = {
  80                 .mask   = IPIC_SIMSR_H,
  81                 .prio   = IPIC_SIPRR_C,
  82                 .force  = IPIC_SIFCR_H,
  83                 .bit    = 22,
  84                 .prio_mask = 6,
  85         },
  86         [8] = {
  87                 .mask   = IPIC_SIMSR_H,
  88                 .prio   = IPIC_SIPRR_C,
  89                 .force  = IPIC_SIFCR_H,
  90                 .bit    = 23,
  91                 .prio_mask = 7,
  92         },
  93         [9] = {
  94                 .mask   = IPIC_SIMSR_H,
  95                 .prio   = IPIC_SIPRR_D,
  96                 .force  = IPIC_SIFCR_H,
  97                 .bit    = 24,
  98                 .prio_mask = 0,
  99         },
 100         [10] = {
 101                 .mask   = IPIC_SIMSR_H,
 102                 .prio   = IPIC_SIPRR_D,
 103                 .force  = IPIC_SIFCR_H,
 104                 .bit    = 25,
 105                 .prio_mask = 1,
 106         },
 107         [11] = {
 108                 .mask   = IPIC_SIMSR_H,
 109                 .prio   = IPIC_SIPRR_D,
 110                 .force  = IPIC_SIFCR_H,
 111                 .bit    = 26,
 112                 .prio_mask = 2,
 113         },
 114         [12] = {
 115                 .mask   = IPIC_SIMSR_H,
 116                 .prio   = IPIC_SIPRR_D,
 117                 .force  = IPIC_SIFCR_H,
 118                 .bit    = 27,
 119                 .prio_mask = 3,
 120         },
 121         [13] = {
 122                 .mask   = IPIC_SIMSR_H,
 123                 .prio   = IPIC_SIPRR_D,
 124                 .force  = IPIC_SIFCR_H,
 125                 .bit    = 28,
 126                 .prio_mask = 4,
 127         },
 128         [14] = {
 129                 .mask   = IPIC_SIMSR_H,
 130                 .prio   = IPIC_SIPRR_D,
 131                 .force  = IPIC_SIFCR_H,
 132                 .bit    = 29,
 133                 .prio_mask = 5,
 134         },
 135         [15] = {
 136                 .mask   = IPIC_SIMSR_H,
 137                 .prio   = IPIC_SIPRR_D,
 138                 .force  = IPIC_SIFCR_H,
 139                 .bit    = 30,
 140                 .prio_mask = 6,
 141         },
 142         [16] = {
 143                 .mask   = IPIC_SIMSR_H,
 144                 .prio   = IPIC_SIPRR_D,
 145                 .force  = IPIC_SIFCR_H,
 146                 .bit    = 31,
 147                 .prio_mask = 7,
 148         },
 149         [17] = {
 150                 .ack    = IPIC_SEPNR,
 151                 .mask   = IPIC_SEMSR,
 152                 .prio   = IPIC_SMPRR_A,
 153                 .force  = IPIC_SEFCR,
 154                 .bit    = 1,
 155                 .prio_mask = 5,
 156         },
 157         [18] = {
 158                 .ack    = IPIC_SEPNR,
 159                 .mask   = IPIC_SEMSR,
 160                 .prio   = IPIC_SMPRR_A,
 161                 .force  = IPIC_SEFCR,
 162                 .bit    = 2,
 163                 .prio_mask = 6,
 164         },
 165         [19] = {
 166                 .ack    = IPIC_SEPNR,
 167                 .mask   = IPIC_SEMSR,
 168                 .prio   = IPIC_SMPRR_A,
 169                 .force  = IPIC_SEFCR,
 170                 .bit    = 3,
 171                 .prio_mask = 7,
 172         },
 173         [20] = {
 174                 .ack    = IPIC_SEPNR,
 175                 .mask   = IPIC_SEMSR,
 176                 .prio   = IPIC_SMPRR_B,
 177                 .force  = IPIC_SEFCR,
 178                 .bit    = 4,
 179                 .prio_mask = 4,
 180         },
 181         [21] = {
 182                 .ack    = IPIC_SEPNR,
 183                 .mask   = IPIC_SEMSR,
 184                 .prio   = IPIC_SMPRR_B,
 185                 .force  = IPIC_SEFCR,
 186                 .bit    = 5,
 187                 .prio_mask = 5,
 188         },
 189         [22] = {
 190                 .ack    = IPIC_SEPNR,
 191                 .mask   = IPIC_SEMSR,
 192                 .prio   = IPIC_SMPRR_B,
 193                 .force  = IPIC_SEFCR,
 194                 .bit    = 6,
 195                 .prio_mask = 6,
 196         },
 197         [23] = {
 198                 .ack    = IPIC_SEPNR,
 199                 .mask   = IPIC_SEMSR,
 200                 .prio   = IPIC_SMPRR_B,
 201                 .force  = IPIC_SEFCR,
 202                 .bit    = 7,
 203                 .prio_mask = 7,
 204         },
 205         [32] = {
 206                 .mask   = IPIC_SIMSR_H,
 207                 .prio   = IPIC_SIPRR_A,
 208                 .force  = IPIC_SIFCR_H,
 209                 .bit    = 0,
 210                 .prio_mask = 0,
 211         },
 212         [33] = {
 213                 .mask   = IPIC_SIMSR_H,
 214                 .prio   = IPIC_SIPRR_A,
 215                 .force  = IPIC_SIFCR_H,
 216                 .bit    = 1,
 217                 .prio_mask = 1,
 218         },
 219         [34] = {
 220                 .mask   = IPIC_SIMSR_H,
 221                 .prio   = IPIC_SIPRR_A,
 222                 .force  = IPIC_SIFCR_H,
 223                 .bit    = 2,
 224                 .prio_mask = 2,
 225         },
 226         [35] = {
 227                 .mask   = IPIC_SIMSR_H,
 228                 .prio   = IPIC_SIPRR_A,
 229                 .force  = IPIC_SIFCR_H,
 230                 .bit    = 3,
 231                 .prio_mask = 3,
 232         },
 233         [36] = {
 234                 .mask   = IPIC_SIMSR_H,
 235                 .prio   = IPIC_SIPRR_A,
 236                 .force  = IPIC_SIFCR_H,
 237                 .bit    = 4,
 238                 .prio_mask = 4,
 239         },
 240         [37] = {
 241                 .mask   = IPIC_SIMSR_H,
 242                 .prio   = IPIC_SIPRR_A,
 243                 .force  = IPIC_SIFCR_H,
 244                 .bit    = 5,
 245                 .prio_mask = 5,
 246         },
 247         [38] = {
 248                 .mask   = IPIC_SIMSR_H,
 249                 .prio   = IPIC_SIPRR_A,
 250                 .force  = IPIC_SIFCR_H,
 251                 .bit    = 6,
 252                 .prio_mask = 6,
 253         },
 254         [39] = {
 255                 .mask   = IPIC_SIMSR_H,
 256                 .prio   = IPIC_SIPRR_A,
 257                 .force  = IPIC_SIFCR_H,
 258                 .bit    = 7,
 259                 .prio_mask = 7,
 260         },
 261         [40] = {
 262                 .mask   = IPIC_SIMSR_H,
 263                 .prio   = IPIC_SIPRR_B,
 264                 .force  = IPIC_SIFCR_H,
 265                 .bit    = 8,
 266                 .prio_mask = 0,
 267         },
 268         [41] = {
 269                 .mask   = IPIC_SIMSR_H,
 270                 .prio   = IPIC_SIPRR_B,
 271                 .force  = IPIC_SIFCR_H,
 272                 .bit    = 9,
 273                 .prio_mask = 1,
 274         },
 275         [42] = {
 276                 .mask   = IPIC_SIMSR_H,
 277                 .prio   = IPIC_SIPRR_B,
 278                 .force  = IPIC_SIFCR_H,
 279                 .bit    = 10,
 280                 .prio_mask = 2,
 281         },
 282         [43] = {
 283                 .mask   = IPIC_SIMSR_H,
 284                 .prio   = IPIC_SIPRR_B,
 285                 .force  = IPIC_SIFCR_H,
 286                 .bit    = 11,
 287                 .prio_mask = 3,
 288         },
 289         [44] = {
 290                 .mask   = IPIC_SIMSR_H,
 291                 .prio   = IPIC_SIPRR_B,
 292                 .force  = IPIC_SIFCR_H,
 293                 .bit    = 12,
 294                 .prio_mask = 4,
 295         },
 296         [45] = {
 297                 .mask   = IPIC_SIMSR_H,
 298                 .prio   = IPIC_SIPRR_B,
 299                 .force  = IPIC_SIFCR_H,
 300                 .bit    = 13,
 301                 .prio_mask = 5,
 302         },
 303         [46] = {
 304                 .mask   = IPIC_SIMSR_H,
 305                 .prio   = IPIC_SIPRR_B,
 306                 .force  = IPIC_SIFCR_H,
 307                 .bit    = 14,
 308                 .prio_mask = 6,
 309         },
 310         [47] = {
 311                 .mask   = IPIC_SIMSR_H,
 312                 .prio   = IPIC_SIPRR_B,
 313                 .force  = IPIC_SIFCR_H,
 314                 .bit    = 15,
 315                 .prio_mask = 7,
 316         },
 317         [48] = {
 318                 .mask   = IPIC_SEMSR,
 319                 .prio   = IPIC_SMPRR_A,
 320                 .force  = IPIC_SEFCR,
 321                 .bit    = 0,
 322                 .prio_mask = 4,
 323         },
 324         [64] = {
 325                 .mask   = IPIC_SIMSR_L,
 326                 .prio   = IPIC_SMPRR_A,
 327                 .force  = IPIC_SIFCR_L,
 328                 .bit    = 0,
 329                 .prio_mask = 0,
 330         },
 331         [65] = {
 332                 .mask   = IPIC_SIMSR_L,
 333                 .prio   = IPIC_SMPRR_A,
 334                 .force  = IPIC_SIFCR_L,
 335                 .bit    = 1,
 336                 .prio_mask = 1,
 337         },
 338         [66] = {
 339                 .mask   = IPIC_SIMSR_L,
 340                 .prio   = IPIC_SMPRR_A,
 341                 .force  = IPIC_SIFCR_L,
 342                 .bit    = 2,
 343                 .prio_mask = 2,
 344         },
 345         [67] = {
 346                 .mask   = IPIC_SIMSR_L,
 347                 .prio   = IPIC_SMPRR_A,
 348                 .force  = IPIC_SIFCR_L,
 349                 .bit    = 3,
 350                 .prio_mask = 3,
 351         },
 352         [68] = {
 353                 .mask   = IPIC_SIMSR_L,
 354                 .prio   = IPIC_SMPRR_B,
 355                 .force  = IPIC_SIFCR_L,
 356                 .bit    = 4,
 357                 .prio_mask = 0,
 358         },
 359         [69] = {
 360                 .mask   = IPIC_SIMSR_L,
 361                 .prio   = IPIC_SMPRR_B,
 362                 .force  = IPIC_SIFCR_L,
 363                 .bit    = 5,
 364                 .prio_mask = 1,
 365         },
 366         [70] = {
 367                 .mask   = IPIC_SIMSR_L,
 368                 .prio   = IPIC_SMPRR_B,
 369                 .force  = IPIC_SIFCR_L,
 370                 .bit    = 6,
 371                 .prio_mask = 2,
 372         },
 373         [71] = {
 374                 .mask   = IPIC_SIMSR_L,
 375                 .prio   = IPIC_SMPRR_B,
 376                 .force  = IPIC_SIFCR_L,
 377                 .bit    = 7,
 378                 .prio_mask = 3,
 379         },
 380         [72] = {
 381                 .mask   = IPIC_SIMSR_L,
 382                 .prio   = 0,
 383                 .force  = IPIC_SIFCR_L,
 384                 .bit    = 8,
 385         },
 386         [73] = {
 387                 .mask   = IPIC_SIMSR_L,
 388                 .prio   = 0,
 389                 .force  = IPIC_SIFCR_L,
 390                 .bit    = 9,
 391         },
 392         [74] = {
 393                 .mask   = IPIC_SIMSR_L,
 394                 .prio   = 0,
 395                 .force  = IPIC_SIFCR_L,
 396                 .bit    = 10,
 397         },
 398         [75] = {
 399                 .mask   = IPIC_SIMSR_L,
 400                 .prio   = 0,
 401                 .force  = IPIC_SIFCR_L,
 402                 .bit    = 11,
 403         },
 404         [76] = {
 405                 .mask   = IPIC_SIMSR_L,
 406                 .prio   = 0,
 407                 .force  = IPIC_SIFCR_L,
 408                 .bit    = 12,
 409         },
 410         [77] = {
 411                 .mask   = IPIC_SIMSR_L,
 412                 .prio   = 0,
 413                 .force  = IPIC_SIFCR_L,
 414                 .bit    = 13,
 415         },
 416         [78] = {
 417                 .mask   = IPIC_SIMSR_L,
 418                 .prio   = 0,
 419                 .force  = IPIC_SIFCR_L,
 420                 .bit    = 14,
 421         },
 422         [79] = {
 423                 .mask   = IPIC_SIMSR_L,
 424                 .prio   = 0,
 425                 .force  = IPIC_SIFCR_L,
 426                 .bit    = 15,
 427         },
 428         [80] = {
 429                 .mask   = IPIC_SIMSR_L,
 430                 .prio   = 0,
 431                 .force  = IPIC_SIFCR_L,
 432                 .bit    = 16,
 433         },
 434         [81] = {
 435                 .mask   = IPIC_SIMSR_L,
 436                 .prio   = 0,
 437                 .force  = IPIC_SIFCR_L,
 438                 .bit    = 17,
 439         },
 440         [82] = {
 441                 .mask   = IPIC_SIMSR_L,
 442                 .prio   = 0,
 443                 .force  = IPIC_SIFCR_L,
 444                 .bit    = 18,
 445         },
 446         [83] = {
 447                 .mask   = IPIC_SIMSR_L,
 448                 .prio   = 0,
 449                 .force  = IPIC_SIFCR_L,
 450                 .bit    = 19,
 451         },
 452         [84] = {
 453                 .mask   = IPIC_SIMSR_L,
 454                 .prio   = 0,
 455                 .force  = IPIC_SIFCR_L,
 456                 .bit    = 20,
 457         },
 458         [85] = {
 459                 .mask   = IPIC_SIMSR_L,
 460                 .prio   = 0,
 461                 .force  = IPIC_SIFCR_L,
 462                 .bit    = 21,
 463         },
 464         [86] = {
 465                 .mask   = IPIC_SIMSR_L,
 466                 .prio   = 0,
 467                 .force  = IPIC_SIFCR_L,
 468                 .bit    = 22,
 469         },
 470         [87] = {
 471                 .mask   = IPIC_SIMSR_L,
 472                 .prio   = 0,
 473                 .force  = IPIC_SIFCR_L,
 474                 .bit    = 23,
 475         },
 476         [88] = {
 477                 .mask   = IPIC_SIMSR_L,
 478                 .prio   = 0,
 479                 .force  = IPIC_SIFCR_L,
 480                 .bit    = 24,
 481         },
 482         [89] = {
 483                 .mask   = IPIC_SIMSR_L,
 484                 .prio   = 0,
 485                 .force  = IPIC_SIFCR_L,
 486                 .bit    = 25,
 487         },
 488         [90] = {
 489                 .mask   = IPIC_SIMSR_L,
 490                 .prio   = 0,
 491                 .force  = IPIC_SIFCR_L,
 492                 .bit    = 26,
 493         },
 494         [91] = {
 495                 .mask   = IPIC_SIMSR_L,
 496                 .prio   = 0,
 497                 .force  = IPIC_SIFCR_L,
 498                 .bit    = 27,
 499         },
 500         [94] = {
 501                 .mask   = IPIC_SIMSR_L,
 502                 .prio   = 0,
 503                 .force  = IPIC_SIFCR_L,
 504                 .bit    = 30,
 505         },
 506 };
 507
 508 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
 509 {
 510         return in_be32(base + (reg >> 2));
 511 }
 512
 513 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
 514 {
 515         out_be32(base + (reg >> 2), value);
 516 }
 517
 518 static inline struct ipic * ipic_from_irq(unsigned int virq)
 519 {
 520         return primary_ipic;
 521 }
 522
 523 #define ipic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 524
 525 static void ipic_unmask_irq(unsigned int virq)
 526 {
 527         struct ipic *ipic = ipic_from_irq(virq);
 528         unsigned int src = ipic_irq_to_hw(virq);
 529         unsigned long flags;
 530         u32 temp;
 531
 532         spin_lock_irqsave(&ipic_lock, flags);
 533
 534         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 535         temp |= (1 << (31 - ipic_info[src].bit));
 536         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 537
 538         spin_unlock_irqrestore(&ipic_lock, flags);
 539 }
 540
 541 static void ipic_mask_irq(unsigned int virq)
 542 {
 543         struct ipic *ipic = ipic_from_irq(virq);
 544         unsigned int src = ipic_irq_to_hw(virq);
 545         unsigned long flags;
 546         u32 temp;
 547
 548         spin_lock_irqsave(&ipic_lock, flags);
 549
 550         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 551         temp &= ~(1 << (31 - ipic_info[src].bit));
 552         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 553
 554         /* mb() can't guarantee that masking is finished.  But it does finish
 555          * for nearly all cases. */
 556         mb();
 557
 558         spin_unlock_irqrestore(&ipic_lock, flags);
 559 }
 560
 561 static void ipic_ack_irq(unsigned int virq)
 562 {
 563         struct ipic *ipic = ipic_from_irq(virq);
 564         unsigned int src = ipic_irq_to_hw(virq);
 565         unsigned long flags;
 566         u32 temp;
 567
 568         spin_lock_irqsave(&ipic_lock, flags);
 569
 570         temp = ipic_read(ipic->regs, ipic_info[src].ack);
 571         temp |= (1 << (31 - ipic_info[src].bit));
 572         ipic_write(ipic->regs, ipic_info[src].ack, temp);
 573
 574         /* mb() can't guarantee that ack is finished.  But it does finish
 575          * for nearly all cases. */
 576         mb();
 577
 578         spin_unlock_irqrestore(&ipic_lock, flags);
 579 }
 580
 581 static void ipic_mask_irq_and_ack(unsigned int virq)
 582 {
 583         struct ipic *ipic = ipic_from_irq(virq);
 584         unsigned int src = ipic_irq_to_hw(virq);
 585         unsigned long flags;
 586         u32 temp;
 587
 588         spin_lock_irqsave(&ipic_lock, flags);
 589
 590         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 591         temp &= ~(1 << (31 - ipic_info[src].bit));
 592         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 593
 594         temp = ipic_read(ipic->regs, ipic_info[src].ack);
 595         temp |= (1 << (31 - ipic_info[src].bit));
 596         ipic_write(ipic->regs, ipic_info[src].ack, temp);
 597
 598         /* mb() can't guarantee that ack is finished.  But it does finish
 599          * for nearly all cases. */
 600         mb();
 601
 602         spin_unlock_irqrestore(&ipic_lock, flags);
 603 }
 604
 605 static int ipic_set_irq_type(unsigned int virq, unsigned int flow_type)
 606 {
 607         struct ipic *ipic = ipic_from_irq(virq);
 608         unsigned int src = ipic_irq_to_hw(virq);
 609         struct irq_desc *desc = get_irq_desc(virq);
 610         unsigned int vold, vnew, edibit;
 611
 612         if (flow_type == IRQ_TYPE_NONE)
 613                 flow_type = IRQ_TYPE_LEVEL_LOW;
 614
 615         /* ipic supports only low assertion and high-to-low change senses
 616          */
 617         if (!(flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))) {
 618                 printk(KERN_ERR "ipic: sense type 0x%x not supported\n",
 619                         flow_type);
 620                 return -EINVAL;
 621         }
 622         /* ipic supports only edge mode on external interrupts */
 623         if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !ipic_info[src].ack) {
 624                 printk(KERN_ERR "ipic: edge sense not supported on internal "
 625                                 "interrupts\n");
 626                 return -EINVAL;
 627         }
 628
 629         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 630         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 631         if (flow_type & IRQ_TYPE_LEVEL_LOW)  {
 632                 desc->status |= IRQ_LEVEL;
 633                 desc->handle_irq = handle_level_irq;
 634                 desc->chip = &ipic_level_irq_chip;
 635         } else {
 636                 desc->handle_irq = handle_edge_irq;
 637                 desc->chip = &ipic_edge_irq_chip;
 638         }
 639
 640         /* only EXT IRQ senses are programmable on ipic
 641          * internal IRQ senses are LEVEL_LOW
 642          */
 643         if (src == IPIC_IRQ_EXT0)
 644                 edibit = 15;
 645         else
 646                 if (src >= IPIC_IRQ_EXT1 && src <= IPIC_IRQ_EXT7)
 647                         edibit = (14 - (src - IPIC_IRQ_EXT1));
 648                 else
 649                         return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;
 650
 651         vold = ipic_read(ipic->regs, IPIC_SECNR);
 652         if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) {
 653                 vnew = vold | (1 << edibit);
 654         } else {
 655                 vnew = vold & ~(1 << edibit);
 656         }
 657         if (vold != vnew)
 658                 ipic_write(ipic->regs, IPIC_SECNR, vnew);
 659         return 0;
 660 }
 661
 662 /* level interrupts and edge interrupts have different ack operations */
 663 static struct irq_chip ipic_level_irq_chip = {
 664         .typename       = " IPIC  ",
 665         .unmask         = ipic_unmask_irq,
 666         .mask           = ipic_mask_irq,
 667         .mask_ack       = ipic_mask_irq,
 668         .set_type       = ipic_set_irq_type,
 669 };
 670
 671 static struct irq_chip ipic_edge_irq_chip = {
 672         .typename       = " IPIC  ",
 673         .unmask         = ipic_unmask_irq,
 674         .mask           = ipic_mask_irq,
 675         .mask_ack       = ipic_mask_irq_and_ack,
 676         .ack            = ipic_ack_irq,
 677         .set_type       = ipic_set_irq_type,
 678 };
 679
 680 static int ipic_host_match(struct irq_host *h, struct device_node *node)
 681 {
 682         /* Exact match, unless ipic node is NULL */
 683         return h->of_node == NULL || h->of_node == node;
 684 }
 685
 686 static int ipic_host_map(struct irq_host *h, unsigned int virq,
 687                          irq_hw_number_t hw)
 688 {
 689         struct ipic *ipic = h->host_data;
 690
 691         set_irq_chip_data(virq, ipic);
 692         set_irq_chip_and_handler(virq, &ipic_level_irq_chip, handle_level_irq);
 693
 694         /* Set default irq type */
 695         set_irq_type(virq, IRQ_TYPE_NONE);
 696
 697         return 0;
 698 }
 699
 700 static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
 701                            u32 *intspec, unsigned int intsize,
 702                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 703
 704 {
 705         /* interrupt sense values coming from the device tree equal either
 706          * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
 707          */
 708         *out_hwirq = intspec[0];
 709         if (intsize > 1)
 710                 *out_flags = intspec[1];
 711         else
 712                 *out_flags = IRQ_TYPE_NONE;
 713         return 0;
 714 }
 715
 716 static struct irq_host_ops ipic_host_ops = {
 717         .match  = ipic_host_match,
 718         .map    = ipic_host_map,
 719         .xlate  = ipic_host_xlate,
 720 };
 721
 722 struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 723 {
 724         struct ipic     *ipic;
 725         struct resource res;
 726         u32 temp = 0, ret;
 727
 728         ret = of_address_to_resource(node, 0, &res);
 729         if (ret)
 730                 return NULL;
 731
 732         ipic = alloc_bootmem(sizeof(struct ipic));
 733         if (ipic == NULL)
 734                 return NULL;
 735
 736         memset(ipic, 0, sizeof(struct ipic));
 737
 738         ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 739                                        NR_IPIC_INTS,
 740                                        &ipic_host_ops, 0);
 741         if (ipic->irqhost == NULL)
 742                 return NULL;
 743
 744         ipic->regs = ioremap(res.start, res.end - res.start + 1);
 745
 746         ipic->irqhost->host_data = ipic;
 747
 748         /* init hw */
 749         ipic_write(ipic->regs, IPIC_SICNR, 0x0);
 750
 751         /* default priority scheme is grouped. If spread mode is required
 752          * configure SICFR accordingly */
 753         if (flags & IPIC_SPREADMODE_GRP_A)
 754                 temp |= SICFR_IPSA;
 755         if (flags & IPIC_SPREADMODE_GRP_B)
 756                 temp |= SICFR_IPSB;
 757         if (flags & IPIC_SPREADMODE_GRP_C)
 758                 temp |= SICFR_IPSC;
 759         if (flags & IPIC_SPREADMODE_GRP_D)
 760                 temp |= SICFR_IPSD;
 761         if (flags & IPIC_SPREADMODE_MIX_A)
 762                 temp |= SICFR_MPSA;
 763         if (flags & IPIC_SPREADMODE_MIX_B)
 764                 temp |= SICFR_MPSB;
 765
 766         ipic_write(ipic->regs, IPIC_SICFR, temp);
 767
 768         /* handle MCP route */
 769         temp = 0;
 770         if (flags & IPIC_DISABLE_MCP_OUT)
 771                 temp = SERCR_MCPR;
 772         ipic_write(ipic->regs, IPIC_SERCR, temp);
 773
 774         /* handle routing of IRQ0 to MCP */
 775         temp = ipic_read(ipic->regs, IPIC_SEMSR);
 776
 777         if (flags & IPIC_IRQ0_MCP)
 778                 temp |= SEMSR_SIRQ0;
 779         else
 780                 temp &= ~SEMSR_SIRQ0;
 781
 782         ipic_write(ipic->regs, IPIC_SEMSR, temp);
 783
 784         primary_ipic = ipic;
 785         irq_set_default_host(primary_ipic->irqhost);
 786
 787         printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
 788                         primary_ipic->regs);
 789
 790         return ipic;
 791 }
 792
 793 int ipic_set_priority(unsigned int virq, unsigned int priority)
 794 {
 795         struct ipic *ipic = ipic_from_irq(virq);
 796         unsigned int src = ipic_irq_to_hw(virq);
 797         u32 temp;
 798
 799         if (priority > 7)
 800                 return -EINVAL;
 801         if (src > 127)
 802                 return -EINVAL;
 803         if (ipic_info[src].prio == 0)
 804                 return -EINVAL;
 805
 806         temp = ipic_read(ipic->regs, ipic_info[src].prio);
 807
 808         if (priority < 4) {
 809                 temp &= ~(0x7 << (20 + (3 - priority) * 3));
 810                 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
 811         } else {
 812                 temp &= ~(0x7 << (4 + (7 - priority) * 3));
 813                 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
 814         }
 815
 816         ipic_write(ipic->regs, ipic_info[src].prio, temp);
 817
 818         return 0;
 819 }
 820
 821 void ipic_set_highest_priority(unsigned int virq)
 822 {
 823         struct ipic *ipic = ipic_from_irq(virq);
 824         unsigned int src = ipic_irq_to_hw(virq);
 825         u32 temp;
 826
 827         temp = ipic_read(ipic->regs, IPIC_SICFR);
 828
 829         /* clear and set HPI */
 830         temp &= 0x7f000000;
 831         temp |= (src & 0x7f) << 24;
 832
 833         ipic_write(ipic->regs, IPIC_SICFR, temp);
 834 }
 835
 836 void ipic_set_default_priority(void)
 837 {
 838         ipic_write(primary_ipic->regs, IPIC_SIPRR_A, IPIC_PRIORITY_DEFAULT);
 839         ipic_write(primary_ipic->regs, IPIC_SIPRR_B, IPIC_PRIORITY_DEFAULT);
 840         ipic_write(primary_ipic->regs, IPIC_SIPRR_C, IPIC_PRIORITY_DEFAULT);
 841         ipic_write(primary_ipic->regs, IPIC_SIPRR_D, IPIC_PRIORITY_DEFAULT);
 842         ipic_write(primary_ipic->regs, IPIC_SMPRR_A, IPIC_PRIORITY_DEFAULT);
 843         ipic_write(primary_ipic->regs, IPIC_SMPRR_B, IPIC_PRIORITY_DEFAULT);
 844 }
 845
 846 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
 847 {
 848         struct ipic *ipic = primary_ipic;
 849         u32 temp;
 850
 851         temp = ipic_read(ipic->regs, IPIC_SERMR);
 852         temp |= (1 << (31 - mcp_irq));
 853         ipic_write(ipic->regs, IPIC_SERMR, temp);
 854 }
 855
 856 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
 857 {
 858         struct ipic *ipic = primary_ipic;
 859         u32 temp;
 860
 861         temp = ipic_read(ipic->regs, IPIC_SERMR);
 862         temp &= (1 << (31 - mcp_irq));
 863         ipic_write(ipic->regs, IPIC_SERMR, temp);
 864 }
 865
 866 u32 ipic_get_mcp_status(void)
 867 {
 868         return ipic_read(primary_ipic->regs, IPIC_SERMR);
 869 }
 870
 871 void ipic_clear_mcp_status(u32 mask)
 872 {
 873         ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
 874 }
 875
 876 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 877 unsigned int ipic_get_irq(void)
 878 {
 879         int irq;
 880
 881         BUG_ON(primary_ipic == NULL);
 882
 883 #define IPIC_SIVCR_VECTOR_MASK  0x7f
 884         irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & IPIC_SIVCR_VECTOR_MASK;
 885
 886         if (irq == 0)    /* 0 --> no irq is pending */
 887                 return NO_IRQ;
 888
 889         return irq_linear_revmap(primary_ipic->irqhost, irq);
 890 }
 891
 892 static struct sysdev_class ipic_sysclass = {
 893         .name = "ipic",
 894 };
 895
 896 static struct sys_device device_ipic = {
 897         .id             = 0,
 898         .cls            = &ipic_sysclass,
 899 };
 900
 901 static int __init init_ipic_sysfs(void)
 902 {
 903         int rc;
 904
 905         if (!primary_ipic || !primary_ipic->regs)
 906                 return -ENODEV;
 907         printk(KERN_DEBUG "Registering ipic with sysfs...\n");
 908
 909         rc = sysdev_class_register(&ipic_sysclass);
 910         if (rc) {
 911                 printk(KERN_ERR "Failed registering ipic sys class\n");
 912                 return -ENODEV;
 913         }
 914         rc = sysdev_register(&device_ipic);
 915         if (rc) {
 916                 printk(KERN_ERR "Failed registering ipic sys device\n");
 917                 return -ENODEV;
 918         }
 919         return 0;
 920 }
 921
 922 subsys_initcall(init_ipic_sysfs);