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 <linux/fsl_devices.h>
  26 #include <asm/irq.h>
  27 #include <asm/io.h>
  28 #include <asm/prom.h>
  29 #include <asm/ipic.h>
  30
  31 #include "ipic.h"
  32
  33 static struct ipic * primary_ipic;
  34 static struct irq_chip ipic_level_irq_chip, ipic_edge_irq_chip;
  35 static DEFINE_SPINLOCK(ipic_lock);
  36
  37 static struct ipic_info ipic_info[] = {
  38         [1] = {
  39                 .mask   = IPIC_SIMSR_H,
  40                 .prio   = IPIC_SIPRR_C,
  41                 .force  = IPIC_SIFCR_H,
  42                 .bit    = 16,
  43                 .prio_mask = 0,
  44         },
  45         [2] = {
  46                 .mask   = IPIC_SIMSR_H,
  47                 .prio   = IPIC_SIPRR_C,
  48                 .force  = IPIC_SIFCR_H,
  49                 .bit    = 17,
  50                 .prio_mask = 1,
  51         },
  52         [3] = {
  53                 .mask   = IPIC_SIMSR_H,
  54                 .prio   = IPIC_SIPRR_C,
  55                 .force  = IPIC_SIFCR_H,
  56                 .bit    = 18,
  57                 .prio_mask = 2,
  58         },
  59         [4] = {
  60                 .mask   = IPIC_SIMSR_H,
  61                 .prio   = IPIC_SIPRR_C,
  62                 .force  = IPIC_SIFCR_H,
  63                 .bit    = 19,
  64                 .prio_mask = 3,
  65         },
  66         [5] = {
  67                 .mask   = IPIC_SIMSR_H,
  68                 .prio   = IPIC_SIPRR_C,
  69                 .force  = IPIC_SIFCR_H,
  70                 .bit    = 20,
  71                 .prio_mask = 4,
  72         },
  73         [6] = {
  74                 .mask   = IPIC_SIMSR_H,
  75                 .prio   = IPIC_SIPRR_C,
  76                 .force  = IPIC_SIFCR_H,
  77                 .bit    = 21,
  78                 .prio_mask = 5,
  79         },
  80         [7] = {
  81                 .mask   = IPIC_SIMSR_H,
  82                 .prio   = IPIC_SIPRR_C,
  83                 .force  = IPIC_SIFCR_H,
  84                 .bit    = 22,
  85                 .prio_mask = 6,
  86         },
  87         [8] = {
  88                 .mask   = IPIC_SIMSR_H,
  89                 .prio   = IPIC_SIPRR_C,
  90                 .force  = IPIC_SIFCR_H,
  91                 .bit    = 23,
  92                 .prio_mask = 7,
  93         },
  94         [9] = {
  95                 .mask   = IPIC_SIMSR_H,
  96                 .prio   = IPIC_SIPRR_D,
  97                 .force  = IPIC_SIFCR_H,
  98                 .bit    = 24,
  99                 .prio_mask = 0,
 100         },
 101         [10] = {
 102                 .mask   = IPIC_SIMSR_H,
 103                 .prio   = IPIC_SIPRR_D,
 104                 .force  = IPIC_SIFCR_H,
 105                 .bit    = 25,
 106                 .prio_mask = 1,
 107         },
 108         [11] = {
 109                 .mask   = IPIC_SIMSR_H,
 110                 .prio   = IPIC_SIPRR_D,
 111                 .force  = IPIC_SIFCR_H,
 112                 .bit    = 26,
 113                 .prio_mask = 2,
 114         },
 115         [12] = {
 116                 .mask   = IPIC_SIMSR_H,
 117                 .prio   = IPIC_SIPRR_D,
 118                 .force  = IPIC_SIFCR_H,
 119                 .bit    = 27,
 120                 .prio_mask = 3,
 121         },
 122         [13] = {
 123                 .mask   = IPIC_SIMSR_H,
 124                 .prio   = IPIC_SIPRR_D,
 125                 .force  = IPIC_SIFCR_H,
 126                 .bit    = 28,
 127                 .prio_mask = 4,
 128         },
 129         [14] = {
 130                 .mask   = IPIC_SIMSR_H,
 131                 .prio   = IPIC_SIPRR_D,
 132                 .force  = IPIC_SIFCR_H,
 133                 .bit    = 29,
 134                 .prio_mask = 5,
 135         },
 136         [15] = {
 137                 .mask   = IPIC_SIMSR_H,
 138                 .prio   = IPIC_SIPRR_D,
 139                 .force  = IPIC_SIFCR_H,
 140                 .bit    = 30,
 141                 .prio_mask = 6,
 142         },
 143         [16] = {
 144                 .mask   = IPIC_SIMSR_H,
 145                 .prio   = IPIC_SIPRR_D,
 146                 .force  = IPIC_SIFCR_H,
 147                 .bit    = 31,
 148                 .prio_mask = 7,
 149         },
 150         [17] = {
 151                 .ack    = IPIC_SEPNR,
 152                 .mask   = IPIC_SEMSR,
 153                 .prio   = IPIC_SMPRR_A,
 154                 .force  = IPIC_SEFCR,
 155                 .bit    = 1,
 156                 .prio_mask = 5,
 157         },
 158         [18] = {
 159                 .ack    = IPIC_SEPNR,
 160                 .mask   = IPIC_SEMSR,
 161                 .prio   = IPIC_SMPRR_A,
 162                 .force  = IPIC_SEFCR,
 163                 .bit    = 2,
 164                 .prio_mask = 6,
 165         },
 166         [19] = {
 167                 .ack    = IPIC_SEPNR,
 168                 .mask   = IPIC_SEMSR,
 169                 .prio   = IPIC_SMPRR_A,
 170                 .force  = IPIC_SEFCR,
 171                 .bit    = 3,
 172                 .prio_mask = 7,
 173         },
 174         [20] = {
 175                 .ack    = IPIC_SEPNR,
 176                 .mask   = IPIC_SEMSR,
 177                 .prio   = IPIC_SMPRR_B,
 178                 .force  = IPIC_SEFCR,
 179                 .bit    = 4,
 180                 .prio_mask = 4,
 181         },
 182         [21] = {
 183                 .ack    = IPIC_SEPNR,
 184                 .mask   = IPIC_SEMSR,
 185                 .prio   = IPIC_SMPRR_B,
 186                 .force  = IPIC_SEFCR,
 187                 .bit    = 5,
 188                 .prio_mask = 5,
 189         },
 190         [22] = {
 191                 .ack    = IPIC_SEPNR,
 192                 .mask   = IPIC_SEMSR,
 193                 .prio   = IPIC_SMPRR_B,
 194                 .force  = IPIC_SEFCR,
 195                 .bit    = 6,
 196                 .prio_mask = 6,
 197         },
 198         [23] = {
 199                 .ack    = IPIC_SEPNR,
 200                 .mask   = IPIC_SEMSR,
 201                 .prio   = IPIC_SMPRR_B,
 202                 .force  = IPIC_SEFCR,
 203                 .bit    = 7,
 204                 .prio_mask = 7,
 205         },
 206         [32] = {
 207                 .mask   = IPIC_SIMSR_H,
 208                 .prio   = IPIC_SIPRR_A,
 209                 .force  = IPIC_SIFCR_H,
 210                 .bit    = 0,
 211                 .prio_mask = 0,
 212         },
 213         [33] = {
 214                 .mask   = IPIC_SIMSR_H,
 215                 .prio   = IPIC_SIPRR_A,
 216                 .force  = IPIC_SIFCR_H,
 217                 .bit    = 1,
 218                 .prio_mask = 1,
 219         },
 220         [34] = {
 221                 .mask   = IPIC_SIMSR_H,
 222                 .prio   = IPIC_SIPRR_A,
 223                 .force  = IPIC_SIFCR_H,
 224                 .bit    = 2,
 225                 .prio_mask = 2,
 226         },
 227         [35] = {
 228                 .mask   = IPIC_SIMSR_H,
 229                 .prio   = IPIC_SIPRR_A,
 230                 .force  = IPIC_SIFCR_H,
 231                 .bit    = 3,
 232                 .prio_mask = 3,
 233         },
 234         [36] = {
 235                 .mask   = IPIC_SIMSR_H,
 236                 .prio   = IPIC_SIPRR_A,
 237                 .force  = IPIC_SIFCR_H,
 238                 .bit    = 4,
 239                 .prio_mask = 4,
 240         },
 241         [37] = {
 242                 .mask   = IPIC_SIMSR_H,
 243                 .prio   = IPIC_SIPRR_A,
 244                 .force  = IPIC_SIFCR_H,
 245                 .bit    = 5,
 246                 .prio_mask = 5,
 247         },
 248         [38] = {
 249                 .mask   = IPIC_SIMSR_H,
 250                 .prio   = IPIC_SIPRR_A,
 251                 .force  = IPIC_SIFCR_H,
 252                 .bit    = 6,
 253                 .prio_mask = 6,
 254         },
 255         [39] = {
 256                 .mask   = IPIC_SIMSR_H,
 257                 .prio   = IPIC_SIPRR_A,
 258                 .force  = IPIC_SIFCR_H,
 259                 .bit    = 7,
 260                 .prio_mask = 7,
 261         },
 262         [40] = {
 263                 .mask   = IPIC_SIMSR_H,
 264                 .prio   = IPIC_SIPRR_B,
 265                 .force  = IPIC_SIFCR_H,
 266                 .bit    = 8,
 267                 .prio_mask = 0,
 268         },
 269         [41] = {
 270                 .mask   = IPIC_SIMSR_H,
 271                 .prio   = IPIC_SIPRR_B,
 272                 .force  = IPIC_SIFCR_H,
 273                 .bit    = 9,
 274                 .prio_mask = 1,
 275         },
 276         [42] = {
 277                 .mask   = IPIC_SIMSR_H,
 278                 .prio   = IPIC_SIPRR_B,
 279                 .force  = IPIC_SIFCR_H,
 280                 .bit    = 10,
 281                 .prio_mask = 2,
 282         },
 283         [43] = {
 284                 .mask   = IPIC_SIMSR_H,
 285                 .prio   = IPIC_SIPRR_B,
 286                 .force  = IPIC_SIFCR_H,
 287                 .bit    = 11,
 288                 .prio_mask = 3,
 289         },
 290         [44] = {
 291                 .mask   = IPIC_SIMSR_H,
 292                 .prio   = IPIC_SIPRR_B,
 293                 .force  = IPIC_SIFCR_H,
 294                 .bit    = 12,
 295                 .prio_mask = 4,
 296         },
 297         [45] = {
 298                 .mask   = IPIC_SIMSR_H,
 299                 .prio   = IPIC_SIPRR_B,
 300                 .force  = IPIC_SIFCR_H,
 301                 .bit    = 13,
 302                 .prio_mask = 5,
 303         },
 304         [46] = {
 305                 .mask   = IPIC_SIMSR_H,
 306                 .prio   = IPIC_SIPRR_B,
 307                 .force  = IPIC_SIFCR_H,
 308                 .bit    = 14,
 309                 .prio_mask = 6,
 310         },
 311         [47] = {
 312                 .mask   = IPIC_SIMSR_H,
 313                 .prio   = IPIC_SIPRR_B,
 314                 .force  = IPIC_SIFCR_H,
 315                 .bit    = 15,
 316                 .prio_mask = 7,
 317         },
 318         [48] = {
 319                 .mask   = IPIC_SEMSR,
 320                 .prio   = IPIC_SMPRR_A,
 321                 .force  = IPIC_SEFCR,
 322                 .bit    = 0,
 323                 .prio_mask = 4,
 324         },
 325         [64] = {
 326                 .mask   = IPIC_SIMSR_L,
 327                 .prio   = IPIC_SMPRR_A,
 328                 .force  = IPIC_SIFCR_L,
 329                 .bit    = 0,
 330                 .prio_mask = 0,
 331         },
 332         [65] = {
 333                 .mask   = IPIC_SIMSR_L,
 334                 .prio   = IPIC_SMPRR_A,
 335                 .force  = IPIC_SIFCR_L,
 336                 .bit    = 1,
 337                 .prio_mask = 1,
 338         },
 339         [66] = {
 340                 .mask   = IPIC_SIMSR_L,
 341                 .prio   = IPIC_SMPRR_A,
 342                 .force  = IPIC_SIFCR_L,
 343                 .bit    = 2,
 344                 .prio_mask = 2,
 345         },
 346         [67] = {
 347                 .mask   = IPIC_SIMSR_L,
 348                 .prio   = IPIC_SMPRR_A,
 349                 .force  = IPIC_SIFCR_L,
 350                 .bit    = 3,
 351                 .prio_mask = 3,
 352         },
 353         [68] = {
 354                 .mask   = IPIC_SIMSR_L,
 355                 .prio   = IPIC_SMPRR_B,
 356                 .force  = IPIC_SIFCR_L,
 357                 .bit    = 4,
 358                 .prio_mask = 0,
 359         },
 360         [69] = {
 361                 .mask   = IPIC_SIMSR_L,
 362                 .prio   = IPIC_SMPRR_B,
 363                 .force  = IPIC_SIFCR_L,
 364                 .bit    = 5,
 365                 .prio_mask = 1,
 366         },
 367         [70] = {
 368                 .mask   = IPIC_SIMSR_L,
 369                 .prio   = IPIC_SMPRR_B,
 370                 .force  = IPIC_SIFCR_L,
 371                 .bit    = 6,
 372                 .prio_mask = 2,
 373         },
 374         [71] = {
 375                 .mask   = IPIC_SIMSR_L,
 376                 .prio   = IPIC_SMPRR_B,
 377                 .force  = IPIC_SIFCR_L,
 378                 .bit    = 7,
 379                 .prio_mask = 3,
 380         },
 381         [72] = {
 382                 .mask   = IPIC_SIMSR_L,
 383                 .prio   = 0,
 384                 .force  = IPIC_SIFCR_L,
 385                 .bit    = 8,
 386         },
 387         [73] = {
 388                 .mask   = IPIC_SIMSR_L,
 389                 .prio   = 0,
 390                 .force  = IPIC_SIFCR_L,
 391                 .bit    = 9,
 392         },
 393         [74] = {
 394                 .mask   = IPIC_SIMSR_L,
 395                 .prio   = 0,
 396                 .force  = IPIC_SIFCR_L,
 397                 .bit    = 10,
 398         },
 399         [75] = {
 400                 .mask   = IPIC_SIMSR_L,
 401                 .prio   = 0,
 402                 .force  = IPIC_SIFCR_L,
 403                 .bit    = 11,
 404         },
 405         [76] = {
 406                 .mask   = IPIC_SIMSR_L,
 407                 .prio   = 0,
 408                 .force  = IPIC_SIFCR_L,
 409                 .bit    = 12,
 410         },
 411         [77] = {
 412                 .mask   = IPIC_SIMSR_L,
 413                 .prio   = 0,
 414                 .force  = IPIC_SIFCR_L,
 415                 .bit    = 13,
 416         },
 417         [78] = {
 418                 .mask   = IPIC_SIMSR_L,
 419                 .prio   = 0,
 420                 .force  = IPIC_SIFCR_L,
 421                 .bit    = 14,
 422         },
 423         [79] = {
 424                 .mask   = IPIC_SIMSR_L,
 425                 .prio   = 0,
 426                 .force  = IPIC_SIFCR_L,
 427                 .bit    = 15,
 428         },
 429         [80] = {
 430                 .mask   = IPIC_SIMSR_L,
 431                 .prio   = 0,
 432                 .force  = IPIC_SIFCR_L,
 433                 .bit    = 16,
 434         },
 435         [81] = {
 436                 .mask   = IPIC_SIMSR_L,
 437                 .prio   = 0,
 438                 .force  = IPIC_SIFCR_L,
 439                 .bit    = 17,
 440         },
 441         [82] = {
 442                 .mask   = IPIC_SIMSR_L,
 443                 .prio   = 0,
 444                 .force  = IPIC_SIFCR_L,
 445                 .bit    = 18,
 446         },
 447         [83] = {
 448                 .mask   = IPIC_SIMSR_L,
 449                 .prio   = 0,
 450                 .force  = IPIC_SIFCR_L,
 451                 .bit    = 19,
 452         },
 453         [84] = {
 454                 .mask   = IPIC_SIMSR_L,
 455                 .prio   = 0,
 456                 .force  = IPIC_SIFCR_L,
 457                 .bit    = 20,
 458         },
 459         [85] = {
 460                 .mask   = IPIC_SIMSR_L,
 461                 .prio   = 0,
 462                 .force  = IPIC_SIFCR_L,
 463                 .bit    = 21,
 464         },
 465         [86] = {
 466                 .mask   = IPIC_SIMSR_L,
 467                 .prio   = 0,
 468                 .force  = IPIC_SIFCR_L,
 469                 .bit    = 22,
 470         },
 471         [87] = {
 472                 .mask   = IPIC_SIMSR_L,
 473                 .prio   = 0,
 474                 .force  = IPIC_SIFCR_L,
 475                 .bit    = 23,
 476         },
 477         [88] = {
 478                 .mask   = IPIC_SIMSR_L,
 479                 .prio   = 0,
 480                 .force  = IPIC_SIFCR_L,
 481                 .bit    = 24,
 482         },
 483         [89] = {
 484                 .mask   = IPIC_SIMSR_L,
 485                 .prio   = 0,
 486                 .force  = IPIC_SIFCR_L,
 487                 .bit    = 25,
 488         },
 489         [90] = {
 490                 .mask   = IPIC_SIMSR_L,
 491                 .prio   = 0,
 492                 .force  = IPIC_SIFCR_L,
 493                 .bit    = 26,
 494         },
 495         [91] = {
 496                 .mask   = IPIC_SIMSR_L,
 497                 .prio   = 0,
 498                 .force  = IPIC_SIFCR_L,
 499                 .bit    = 27,
 500         },
 501         [94] = {
 502                 .mask   = IPIC_SIMSR_L,
 503                 .prio   = 0,
 504                 .force  = IPIC_SIFCR_L,
 505                 .bit    = 30,
 506         },
 507 };
 508
 509 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
 510 {
 511         return in_be32(base + (reg >> 2));
 512 }
 513
 514 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
 515 {
 516         out_be32(base + (reg >> 2), value);
 517 }
 518
 519 static inline struct ipic * ipic_from_irq(unsigned int virq)
 520 {
 521         return primary_ipic;
 522 }
 523
 524 #define ipic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 525
 526 static void ipic_unmask_irq(unsigned int virq)
 527 {
 528         struct ipic *ipic = ipic_from_irq(virq);
 529         unsigned int src = ipic_irq_to_hw(virq);
 530         unsigned long flags;
 531         u32 temp;
 532
 533         spin_lock_irqsave(&ipic_lock, flags);
 534
 535         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 536         temp |= (1 << (31 - ipic_info[src].bit));
 537         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 538
 539         spin_unlock_irqrestore(&ipic_lock, flags);
 540 }
 541
 542 static void ipic_mask_irq(unsigned int virq)
 543 {
 544         struct ipic *ipic = ipic_from_irq(virq);
 545         unsigned int src = ipic_irq_to_hw(virq);
 546         unsigned long flags;
 547         u32 temp;
 548
 549         spin_lock_irqsave(&ipic_lock, flags);
 550
 551         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 552         temp &= ~(1 << (31 - ipic_info[src].bit));
 553         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 554
 555         /* mb() can't guarantee that masking is finished.  But it does finish
 556          * for nearly all cases. */
 557         mb();
 558
 559         spin_unlock_irqrestore(&ipic_lock, flags);
 560 }
 561
 562 static void ipic_ack_irq(unsigned int virq)
 563 {
 564         struct ipic *ipic = ipic_from_irq(virq);
 565         unsigned int src = ipic_irq_to_hw(virq);
 566         unsigned long flags;
 567         u32 temp;
 568
 569         spin_lock_irqsave(&ipic_lock, flags);
 570
 571         temp = ipic_read(ipic->regs, ipic_info[src].ack);
 572         temp |= (1 << (31 - ipic_info[src].bit));
 573         ipic_write(ipic->regs, ipic_info[src].ack, temp);
 574
 575         /* mb() can't guarantee that ack is finished.  But it does finish
 576          * for nearly all cases. */
 577         mb();
 578
 579         spin_unlock_irqrestore(&ipic_lock, flags);
 580 }
 581
 582 static void ipic_mask_irq_and_ack(unsigned int virq)
 583 {
 584         struct ipic *ipic = ipic_from_irq(virq);
 585         unsigned int src = ipic_irq_to_hw(virq);
 586         unsigned long flags;
 587         u32 temp;
 588
 589         spin_lock_irqsave(&ipic_lock, flags);
 590
 591         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 592         temp &= ~(1 << (31 - ipic_info[src].bit));
 593         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 594
 595         temp = ipic_read(ipic->regs, ipic_info[src].ack);
 596         temp |= (1 << (31 - ipic_info[src].bit));
 597         ipic_write(ipic->regs, ipic_info[src].ack, temp);
 598
 599         /* mb() can't guarantee that ack is finished.  But it does finish
 600          * for nearly all cases. */
 601         mb();
 602
 603         spin_unlock_irqrestore(&ipic_lock, flags);
 604 }
 605
 606 static int ipic_set_irq_type(unsigned int virq, unsigned int flow_type)
 607 {
 608         struct ipic *ipic = ipic_from_irq(virq);
 609         unsigned int src = ipic_irq_to_hw(virq);
 610         struct irq_desc *desc = get_irq_desc(virq);
 611         unsigned int vold, vnew, edibit;
 612
 613         if (flow_type == IRQ_TYPE_NONE)
 614                 flow_type = IRQ_TYPE_LEVEL_LOW;
 615
 616         /* ipic supports only low assertion and high-to-low change senses
 617          */
 618         if (!(flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING))) {
 619                 printk(KERN_ERR "ipic: sense type 0x%x not supported\n",
 620                         flow_type);
 621                 return -EINVAL;
 622         }
 623         /* ipic supports only edge mode on external interrupts */
 624         if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !ipic_info[src].ack) {
 625                 printk(KERN_ERR "ipic: edge sense not supported on internal "
 626                                 "interrupts\n");
 627                 return -EINVAL;
 628         }
 629
 630         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 631         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 632         if (flow_type & IRQ_TYPE_LEVEL_LOW)  {
 633                 desc->status |= IRQ_LEVEL;
 634                 desc->handle_irq = handle_level_irq;
 635                 desc->chip = &ipic_level_irq_chip;
 636         } else {
 637                 desc->handle_irq = handle_edge_irq;
 638                 desc->chip = &ipic_edge_irq_chip;
 639         }
 640
 641         /* only EXT IRQ senses are programmable on ipic
 642          * internal IRQ senses are LEVEL_LOW
 643          */
 644         if (src == IPIC_IRQ_EXT0)
 645                 edibit = 15;
 646         else
 647                 if (src >= IPIC_IRQ_EXT1 && src <= IPIC_IRQ_EXT7)
 648                         edibit = (14 - (src - IPIC_IRQ_EXT1));
 649                 else
 650                         return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;
 651
 652         vold = ipic_read(ipic->regs, IPIC_SECNR);
 653         if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) {
 654                 vnew = vold | (1 << edibit);
 655         } else {
 656                 vnew = vold & ~(1 << edibit);
 657         }
 658         if (vold != vnew)
 659                 ipic_write(ipic->regs, IPIC_SECNR, vnew);
 660         return 0;
 661 }
 662
 663 /* level interrupts and edge interrupts have different ack operations */
 664 static struct irq_chip ipic_level_irq_chip = {
 665         .typename       = " IPIC  ",
 666         .unmask         = ipic_unmask_irq,
 667         .mask           = ipic_mask_irq,
 668         .mask_ack       = ipic_mask_irq,
 669         .set_type       = ipic_set_irq_type,
 670 };
 671
 672 static struct irq_chip ipic_edge_irq_chip = {
 673         .typename       = " IPIC  ",
 674         .unmask         = ipic_unmask_irq,
 675         .mask           = ipic_mask_irq,
 676         .mask_ack       = ipic_mask_irq_and_ack,
 677         .ack            = ipic_ack_irq,
 678         .set_type       = ipic_set_irq_type,
 679 };
 680
 681 static int ipic_host_match(struct irq_host *h, struct device_node *node)
 682 {
 683         /* Exact match, unless ipic node is NULL */
 684         return h->of_node == NULL || h->of_node == node;
 685 }
 686
 687 static int ipic_host_map(struct irq_host *h, unsigned int virq,
 688                          irq_hw_number_t hw)
 689 {
 690         struct ipic *ipic = h->host_data;
 691
 692         set_irq_chip_data(virq, ipic);
 693         set_irq_chip_and_handler(virq, &ipic_level_irq_chip, handle_level_irq);
 694
 695         /* Set default irq type */
 696         set_irq_type(virq, IRQ_TYPE_NONE);
 697
 698         return 0;
 699 }
 700
 701 static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
 702                            u32 *intspec, unsigned int intsize,
 703                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 704
 705 {
 706         /* interrupt sense values coming from the device tree equal either
 707          * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
 708          */
 709         *out_hwirq = intspec[0];
 710         if (intsize > 1)
 711                 *out_flags = intspec[1];
 712         else
 713                 *out_flags = IRQ_TYPE_NONE;
 714         return 0;
 715 }
 716
 717 static struct irq_host_ops ipic_host_ops = {
 718         .match  = ipic_host_match,
 719         .map    = ipic_host_map,
 720         .xlate  = ipic_host_xlate,
 721 };
 722
 723 struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 724 {
 725         struct ipic     *ipic;
 726         struct resource res;
 727         u32 temp = 0, ret;
 728
 729         ret = of_address_to_resource(node, 0, &res);
 730         if (ret)
 731                 return NULL;
 732
 733         ipic = alloc_bootmem(sizeof(struct ipic));
 734         if (ipic == NULL)
 735                 return NULL;
 736
 737         memset(ipic, 0, sizeof(struct ipic));
 738
 739         ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 740                                        NR_IPIC_INTS,
 741                                        &ipic_host_ops, 0);
 742         if (ipic->irqhost == NULL)
 743                 return NULL;
 744
 745         ipic->regs = ioremap(res.start, res.end - res.start + 1);
 746
 747         ipic->irqhost->host_data = ipic;
 748
 749         /* init hw */
 750         ipic_write(ipic->regs, IPIC_SICNR, 0x0);
 751
 752         /* default priority scheme is grouped. If spread mode is required
 753          * configure SICFR accordingly */
 754         if (flags & IPIC_SPREADMODE_GRP_A)
 755                 temp |= SICFR_IPSA;
 756         if (flags & IPIC_SPREADMODE_GRP_B)
 757                 temp |= SICFR_IPSB;
 758         if (flags & IPIC_SPREADMODE_GRP_C)
 759                 temp |= SICFR_IPSC;
 760         if (flags & IPIC_SPREADMODE_GRP_D)
 761                 temp |= SICFR_IPSD;
 762         if (flags & IPIC_SPREADMODE_MIX_A)
 763                 temp |= SICFR_MPSA;
 764         if (flags & IPIC_SPREADMODE_MIX_B)
 765                 temp |= SICFR_MPSB;
 766
 767         ipic_write(ipic->regs, IPIC_SICFR, temp);
 768
 769         /* handle MCP route */
 770         temp = 0;
 771         if (flags & IPIC_DISABLE_MCP_OUT)
 772                 temp = SERCR_MCPR;
 773         ipic_write(ipic->regs, IPIC_SERCR, temp);
 774
 775         /* handle routing of IRQ0 to MCP */
 776         temp = ipic_read(ipic->regs, IPIC_SEMSR);
 777
 778         if (flags & IPIC_IRQ0_MCP)
 779                 temp |= SEMSR_SIRQ0;
 780         else
 781                 temp &= ~SEMSR_SIRQ0;
 782
 783         ipic_write(ipic->regs, IPIC_SEMSR, temp);
 784
 785         primary_ipic = ipic;
 786         irq_set_default_host(primary_ipic->irqhost);
 787
 788         printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
 789                         primary_ipic->regs);
 790
 791         return ipic;
 792 }
 793
 794 int ipic_set_priority(unsigned int virq, unsigned int priority)
 795 {
 796         struct ipic *ipic = ipic_from_irq(virq);
 797         unsigned int src = ipic_irq_to_hw(virq);
 798         u32 temp;
 799
 800         if (priority > 7)
 801                 return -EINVAL;
 802         if (src > 127)
 803                 return -EINVAL;
 804         if (ipic_info[src].prio == 0)
 805                 return -EINVAL;
 806
 807         temp = ipic_read(ipic->regs, ipic_info[src].prio);
 808
 809         if (priority < 4) {
 810                 temp &= ~(0x7 << (20 + (3 - priority) * 3));
 811                 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
 812         } else {
 813                 temp &= ~(0x7 << (4 + (7 - priority) * 3));
 814                 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
 815         }
 816
 817         ipic_write(ipic->regs, ipic_info[src].prio, temp);
 818
 819         return 0;
 820 }
 821
 822 void ipic_set_highest_priority(unsigned int virq)
 823 {
 824         struct ipic *ipic = ipic_from_irq(virq);
 825         unsigned int src = ipic_irq_to_hw(virq);
 826         u32 temp;
 827
 828         temp = ipic_read(ipic->regs, IPIC_SICFR);
 829
 830         /* clear and set HPI */
 831         temp &= 0x7f000000;
 832         temp |= (src & 0x7f) << 24;
 833
 834         ipic_write(ipic->regs, IPIC_SICFR, temp);
 835 }
 836
 837 void ipic_set_default_priority(void)
 838 {
 839         ipic_write(primary_ipic->regs, IPIC_SIPRR_A, IPIC_PRIORITY_DEFAULT);
 840         ipic_write(primary_ipic->regs, IPIC_SIPRR_B, IPIC_PRIORITY_DEFAULT);
 841         ipic_write(primary_ipic->regs, IPIC_SIPRR_C, IPIC_PRIORITY_DEFAULT);
 842         ipic_write(primary_ipic->regs, IPIC_SIPRR_D, IPIC_PRIORITY_DEFAULT);
 843         ipic_write(primary_ipic->regs, IPIC_SMPRR_A, IPIC_PRIORITY_DEFAULT);
 844         ipic_write(primary_ipic->regs, IPIC_SMPRR_B, IPIC_PRIORITY_DEFAULT);
 845 }
 846
 847 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
 848 {
 849         struct ipic *ipic = primary_ipic;
 850         u32 temp;
 851
 852         temp = ipic_read(ipic->regs, IPIC_SERMR);
 853         temp |= (1 << (31 - mcp_irq));
 854         ipic_write(ipic->regs, IPIC_SERMR, temp);
 855 }
 856
 857 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
 858 {
 859         struct ipic *ipic = primary_ipic;
 860         u32 temp;
 861
 862         temp = ipic_read(ipic->regs, IPIC_SERMR);
 863         temp &= (1 << (31 - mcp_irq));
 864         ipic_write(ipic->regs, IPIC_SERMR, temp);
 865 }
 866
 867 u32 ipic_get_mcp_status(void)
 868 {
 869         return ipic_read(primary_ipic->regs, IPIC_SERMR);
 870 }
 871
 872 void ipic_clear_mcp_status(u32 mask)
 873 {
 874         ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
 875 }
 876
 877 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 878 unsigned int ipic_get_irq(void)
 879 {
 880         int irq;
 881
 882         BUG_ON(primary_ipic == NULL);
 883
 884 #define IPIC_SIVCR_VECTOR_MASK  0x7f
 885         irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & IPIC_SIVCR_VECTOR_MASK;
 886
 887         if (irq == 0)    /* 0 --> no irq is pending */
 888                 return NO_IRQ;
 889
 890         return irq_linear_revmap(primary_ipic->irqhost, irq);
 891 }
 892
 893 #ifdef CONFIG_SUSPEND
 894 static struct {
 895         u32 sicfr;
 896         u32 siprr[2];
 897         u32 simsr[2];
 898         u32 sicnr;
 899         u32 smprr[2];
 900         u32 semsr;
 901         u32 secnr;
 902         u32 sermr;
 903         u32 sercr;
 904 } ipic_saved_state;
 905
 906 static int ipic_suspend(struct sys_device *sdev, pm_message_t state)
 907 {
 908         struct ipic *ipic = primary_ipic;
 909
 910         ipic_saved_state.sicfr = ipic_read(ipic->regs, IPIC_SICFR);
 911         ipic_saved_state.siprr[0] = ipic_read(ipic->regs, IPIC_SIPRR_A);
 912         ipic_saved_state.siprr[1] = ipic_read(ipic->regs, IPIC_SIPRR_D);
 913         ipic_saved_state.simsr[0] = ipic_read(ipic->regs, IPIC_SIMSR_H);
 914         ipic_saved_state.simsr[1] = ipic_read(ipic->regs, IPIC_SIMSR_L);
 915         ipic_saved_state.sicnr = ipic_read(ipic->regs, IPIC_SICNR);
 916         ipic_saved_state.smprr[0] = ipic_read(ipic->regs, IPIC_SMPRR_A);
 917         ipic_saved_state.smprr[1] = ipic_read(ipic->regs, IPIC_SMPRR_B);
 918         ipic_saved_state.semsr = ipic_read(ipic->regs, IPIC_SEMSR);
 919         ipic_saved_state.secnr = ipic_read(ipic->regs, IPIC_SECNR);
 920         ipic_saved_state.sermr = ipic_read(ipic->regs, IPIC_SERMR);
 921         ipic_saved_state.sercr = ipic_read(ipic->regs, IPIC_SERCR);
 922
 923         if (fsl_deep_sleep()) {
 924                 /* In deep sleep, make sure there can be no
 925                  * pending interrupts, as this can cause
 926                  * problems on 831x.
 927                  */
 928                 ipic_write(ipic->regs, IPIC_SIMSR_H, 0);
 929                 ipic_write(ipic->regs, IPIC_SIMSR_L, 0);
 930                 ipic_write(ipic->regs, IPIC_SEMSR, 0);
 931                 ipic_write(ipic->regs, IPIC_SERMR, 0);
 932         }
 933
 934         return 0;
 935 }
 936
 937 static int ipic_resume(struct sys_device *sdev)
 938 {
 939         struct ipic *ipic = primary_ipic;
 940
 941         ipic_write(ipic->regs, IPIC_SICFR, ipic_saved_state.sicfr);
 942         ipic_write(ipic->regs, IPIC_SIPRR_A, ipic_saved_state.siprr[0]);
 943         ipic_write(ipic->regs, IPIC_SIPRR_D, ipic_saved_state.siprr[1]);
 944         ipic_write(ipic->regs, IPIC_SIMSR_H, ipic_saved_state.simsr[0]);
 945         ipic_write(ipic->regs, IPIC_SIMSR_L, ipic_saved_state.simsr[1]);
 946         ipic_write(ipic->regs, IPIC_SICNR, ipic_saved_state.sicnr);
 947         ipic_write(ipic->regs, IPIC_SMPRR_A, ipic_saved_state.smprr[0]);
 948         ipic_write(ipic->regs, IPIC_SMPRR_B, ipic_saved_state.smprr[1]);
 949         ipic_write(ipic->regs, IPIC_SEMSR, ipic_saved_state.semsr);
 950         ipic_write(ipic->regs, IPIC_SECNR, ipic_saved_state.secnr);
 951         ipic_write(ipic->regs, IPIC_SERMR, ipic_saved_state.sermr);
 952         ipic_write(ipic->regs, IPIC_SERCR, ipic_saved_state.sercr);
 953
 954         return 0;
 955 }
 956 #else
 957 #define ipic_suspend NULL
 958 #define ipic_resume NULL
 959 #endif
 960
 961 static struct sysdev_class ipic_sysclass = {
 962         .name = "ipic",
 963         .suspend = ipic_suspend,
 964         .resume = ipic_resume,
 965 };
 966
 967 static struct sys_device device_ipic = {
 968         .id             = 0,
 969         .cls            = &ipic_sysclass,
 970 };
 971
 972 static int __init init_ipic_sysfs(void)
 973 {
 974         int rc;
 975
 976         if (!primary_ipic || !primary_ipic->regs)
 977                 return -ENODEV;
 978         printk(KERN_DEBUG "Registering ipic with sysfs...\n");
 979
 980         rc = sysdev_class_register(&ipic_sysclass);
 981         if (rc) {
 982                 printk(KERN_ERR "Failed registering ipic sys class\n");
 983                 return -ENODEV;
 984         }
 985         rc = sysdev_register(&device_ipic);
 986         if (rc) {
 987                 printk(KERN_ERR "Failed registering ipic sys device\n");
 988                 return -ENODEV;
 989         }
 990         return 0;
 991 }
 992
 993 subsys_initcall(init_ipic_sysfs);