arch/ppc/syslib/ipic.c

   1 /*
   2  * include/asm-ppc/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 <asm/irq.h>
  23 #include <asm/io.h>
  24 #include <asm/ipic.h>
  25 #include <asm/mpc83xx.h>
  26
  27 #include "ipic.h"
  28
  29 static struct ipic p_ipic;
  30 static struct ipic * primary_ipic;
  31
  32 static struct ipic_info ipic_info[] = {
  33         [9] = {
  34                 .pend   = IPIC_SIPNR_H,
  35                 .mask   = IPIC_SIMSR_H,
  36                 .prio   = IPIC_SIPRR_D,
  37                 .force  = IPIC_SIFCR_H,
  38                 .bit    = 24,
  39                 .prio_mask = 0,
  40         },
  41         [10] = {
  42                 .pend   = IPIC_SIPNR_H,
  43                 .mask   = IPIC_SIMSR_H,
  44                 .prio   = IPIC_SIPRR_D,
  45                 .force  = IPIC_SIFCR_H,
  46                 .bit    = 25,
  47                 .prio_mask = 1,
  48         },
  49         [11] = {
  50                 .pend   = IPIC_SIPNR_H,
  51                 .mask   = IPIC_SIMSR_H,
  52                 .prio   = IPIC_SIPRR_D,
  53                 .force  = IPIC_SIFCR_H,
  54                 .bit    = 26,
  55                 .prio_mask = 2,
  56         },
  57         [14] = {
  58                 .pend   = IPIC_SIPNR_H,
  59                 .mask   = IPIC_SIMSR_H,
  60                 .prio   = IPIC_SIPRR_D,
  61                 .force  = IPIC_SIFCR_H,
  62                 .bit    = 29,
  63                 .prio_mask = 5,
  64         },
  65         [15] = {
  66                 .pend   = IPIC_SIPNR_H,
  67                 .mask   = IPIC_SIMSR_H,
  68                 .prio   = IPIC_SIPRR_D,
  69                 .force  = IPIC_SIFCR_H,
  70                 .bit    = 30,
  71                 .prio_mask = 6,
  72         },
  73         [16] = {
  74                 .pend   = IPIC_SIPNR_H,
  75                 .mask   = IPIC_SIMSR_H,
  76                 .prio   = IPIC_SIPRR_D,
  77                 .force  = IPIC_SIFCR_H,
  78                 .bit    = 31,
  79                 .prio_mask = 7,
  80         },
  81         [17] = {
  82                 .pend   = IPIC_SIPNR_H,
  83                 .mask   = IPIC_SEMSR,
  84                 .prio   = IPIC_SMPRR_A,
  85                 .force  = IPIC_SEFCR,
  86                 .bit    = 1,
  87                 .prio_mask = 5,
  88         },
  89         [18] = {
  90                 .pend   = IPIC_SIPNR_H,
  91                 .mask   = IPIC_SEMSR,
  92                 .prio   = IPIC_SMPRR_A,
  93                 .force  = IPIC_SEFCR,
  94                 .bit    = 2,
  95                 .prio_mask = 6,
  96         },
  97         [19] = {
  98                 .pend   = IPIC_SIPNR_H,
  99                 .mask   = IPIC_SEMSR,
 100                 .prio   = IPIC_SMPRR_A,
 101                 .force  = IPIC_SEFCR,
 102                 .bit    = 3,
 103                 .prio_mask = 7,
 104         },
 105         [20] = {
 106                 .pend   = IPIC_SIPNR_H,
 107                 .mask   = IPIC_SEMSR,
 108                 .prio   = IPIC_SMPRR_B,
 109                 .force  = IPIC_SEFCR,
 110                 .bit    = 4,
 111                 .prio_mask = 4,
 112         },
 113         [21] = {
 114                 .pend   = IPIC_SIPNR_H,
 115                 .mask   = IPIC_SEMSR,
 116                 .prio   = IPIC_SMPRR_B,
 117                 .force  = IPIC_SEFCR,
 118                 .bit    = 5,
 119                 .prio_mask = 5,
 120         },
 121         [22] = {
 122                 .pend   = IPIC_SIPNR_H,
 123                 .mask   = IPIC_SEMSR,
 124                 .prio   = IPIC_SMPRR_B,
 125                 .force  = IPIC_SEFCR,
 126                 .bit    = 6,
 127                 .prio_mask = 6,
 128         },
 129         [23] = {
 130                 .pend   = IPIC_SIPNR_H,
 131                 .mask   = IPIC_SEMSR,
 132                 .prio   = IPIC_SMPRR_B,
 133                 .force  = IPIC_SEFCR,
 134                 .bit    = 7,
 135                 .prio_mask = 7,
 136         },
 137         [32] = {
 138                 .pend   = IPIC_SIPNR_H,
 139                 .mask   = IPIC_SIMSR_H,
 140                 .prio   = IPIC_SIPRR_A,
 141                 .force  = IPIC_SIFCR_H,
 142                 .bit    = 0,
 143                 .prio_mask = 0,
 144         },
 145         [33] = {
 146                 .pend   = IPIC_SIPNR_H,
 147                 .mask   = IPIC_SIMSR_H,
 148                 .prio   = IPIC_SIPRR_A,
 149                 .force  = IPIC_SIFCR_H,
 150                 .bit    = 1,
 151                 .prio_mask = 1,
 152         },
 153         [34] = {
 154                 .pend   = IPIC_SIPNR_H,
 155                 .mask   = IPIC_SIMSR_H,
 156                 .prio   = IPIC_SIPRR_A,
 157                 .force  = IPIC_SIFCR_H,
 158                 .bit    = 2,
 159                 .prio_mask = 2,
 160         },
 161         [35] = {
 162                 .pend   = IPIC_SIPNR_H,
 163                 .mask   = IPIC_SIMSR_H,
 164                 .prio   = IPIC_SIPRR_A,
 165                 .force  = IPIC_SIFCR_H,
 166                 .bit    = 3,
 167                 .prio_mask = 3,
 168         },
 169         [36] = {
 170                 .pend   = IPIC_SIPNR_H,
 171                 .mask   = IPIC_SIMSR_H,
 172                 .prio   = IPIC_SIPRR_A,
 173                 .force  = IPIC_SIFCR_H,
 174                 .bit    = 4,
 175                 .prio_mask = 4,
 176         },
 177         [37] = {
 178                 .pend   = IPIC_SIPNR_H,
 179                 .mask   = IPIC_SIMSR_H,
 180                 .prio   = IPIC_SIPRR_A,
 181                 .force  = IPIC_SIFCR_H,
 182                 .bit    = 5,
 183                 .prio_mask = 5,
 184         },
 185         [38] = {
 186                 .pend   = IPIC_SIPNR_H,
 187                 .mask   = IPIC_SIMSR_H,
 188                 .prio   = IPIC_SIPRR_A,
 189                 .force  = IPIC_SIFCR_H,
 190                 .bit    = 6,
 191                 .prio_mask = 6,
 192         },
 193         [39] = {
 194                 .pend   = IPIC_SIPNR_H,
 195                 .mask   = IPIC_SIMSR_H,
 196                 .prio   = IPIC_SIPRR_A,
 197                 .force  = IPIC_SIFCR_H,
 198                 .bit    = 7,
 199                 .prio_mask = 7,
 200         },
 201         [48] = {
 202                 .pend   = IPIC_SEPNR,
 203                 .mask   = IPIC_SEMSR,
 204                 .prio   = IPIC_SMPRR_A,
 205                 .force  = IPIC_SEFCR,
 206                 .bit    = 0,
 207                 .prio_mask = 4,
 208         },
 209         [64] = {
 210                 .pend   = IPIC_SIPNR_H,
 211                 .mask   = IPIC_SIMSR_L,
 212                 .prio   = IPIC_SMPRR_A,
 213                 .force  = IPIC_SIFCR_L,
 214                 .bit    = 0,
 215                 .prio_mask = 0,
 216         },
 217         [65] = {
 218                 .pend   = IPIC_SIPNR_H,
 219                 .mask   = IPIC_SIMSR_L,
 220                 .prio   = IPIC_SMPRR_A,
 221                 .force  = IPIC_SIFCR_L,
 222                 .bit    = 1,
 223                 .prio_mask = 1,
 224         },
 225         [66] = {
 226                 .pend   = IPIC_SIPNR_H,
 227                 .mask   = IPIC_SIMSR_L,
 228                 .prio   = IPIC_SMPRR_A,
 229                 .force  = IPIC_SIFCR_L,
 230                 .bit    = 2,
 231                 .prio_mask = 2,
 232         },
 233         [67] = {
 234                 .pend   = IPIC_SIPNR_H,
 235                 .mask   = IPIC_SIMSR_L,
 236                 .prio   = IPIC_SMPRR_A,
 237                 .force  = IPIC_SIFCR_L,
 238                 .bit    = 3,
 239                 .prio_mask = 3,
 240         },
 241         [68] = {
 242                 .pend   = IPIC_SIPNR_H,
 243                 .mask   = IPIC_SIMSR_L,
 244                 .prio   = IPIC_SMPRR_B,
 245                 .force  = IPIC_SIFCR_L,
 246                 .bit    = 4,
 247                 .prio_mask = 0,
 248         },
 249         [69] = {
 250                 .pend   = IPIC_SIPNR_H,
 251                 .mask   = IPIC_SIMSR_L,
 252                 .prio   = IPIC_SMPRR_B,
 253                 .force  = IPIC_SIFCR_L,
 254                 .bit    = 5,
 255                 .prio_mask = 1,
 256         },
 257         [70] = {
 258                 .pend   = IPIC_SIPNR_H,
 259                 .mask   = IPIC_SIMSR_L,
 260                 .prio   = IPIC_SMPRR_B,
 261                 .force  = IPIC_SIFCR_L,
 262                 .bit    = 6,
 263                 .prio_mask = 2,
 264         },
 265         [71] = {
 266                 .pend   = IPIC_SIPNR_H,
 267                 .mask   = IPIC_SIMSR_L,
 268                 .prio   = IPIC_SMPRR_B,
 269                 .force  = IPIC_SIFCR_L,
 270                 .bit    = 7,
 271                 .prio_mask = 3,
 272         },
 273         [72] = {
 274                 .pend   = IPIC_SIPNR_H,
 275                 .mask   = IPIC_SIMSR_L,
 276                 .prio   = 0,
 277                 .force  = IPIC_SIFCR_L,
 278                 .bit    = 8,
 279         },
 280         [73] = {
 281                 .pend   = IPIC_SIPNR_H,
 282                 .mask   = IPIC_SIMSR_L,
 283                 .prio   = 0,
 284                 .force  = IPIC_SIFCR_L,
 285                 .bit    = 9,
 286         },
 287         [74] = {
 288                 .pend   = IPIC_SIPNR_H,
 289                 .mask   = IPIC_SIMSR_L,
 290                 .prio   = 0,
 291                 .force  = IPIC_SIFCR_L,
 292                 .bit    = 10,
 293         },
 294         [75] = {
 295                 .pend   = IPIC_SIPNR_H,
 296                 .mask   = IPIC_SIMSR_L,
 297                 .prio   = 0,
 298                 .force  = IPIC_SIFCR_L,
 299                 .bit    = 11,
 300         },
 301         [76] = {
 302                 .pend   = IPIC_SIPNR_H,
 303                 .mask   = IPIC_SIMSR_L,
 304                 .prio   = 0,
 305                 .force  = IPIC_SIFCR_L,
 306                 .bit    = 12,
 307         },
 308         [77] = {
 309                 .pend   = IPIC_SIPNR_H,
 310                 .mask   = IPIC_SIMSR_L,
 311                 .prio   = 0,
 312                 .force  = IPIC_SIFCR_L,
 313                 .bit    = 13,
 314         },
 315         [78] = {
 316                 .pend   = IPIC_SIPNR_H,
 317                 .mask   = IPIC_SIMSR_L,
 318                 .prio   = 0,
 319                 .force  = IPIC_SIFCR_L,
 320                 .bit    = 14,
 321         },
 322         [79] = {
 323                 .pend   = IPIC_SIPNR_H,
 324                 .mask   = IPIC_SIMSR_L,
 325                 .prio   = 0,
 326                 .force  = IPIC_SIFCR_L,
 327                 .bit    = 15,
 328         },
 329         [80] = {
 330                 .pend   = IPIC_SIPNR_H,
 331                 .mask   = IPIC_SIMSR_L,
 332                 .prio   = 0,
 333                 .force  = IPIC_SIFCR_L,
 334                 .bit    = 16,
 335         },
 336         [84] = {
 337                 .pend   = IPIC_SIPNR_H,
 338                 .mask   = IPIC_SIMSR_L,
 339                 .prio   = 0,
 340                 .force  = IPIC_SIFCR_L,
 341                 .bit    = 20,
 342         },
 343         [85] = {
 344                 .pend   = IPIC_SIPNR_H,
 345                 .mask   = IPIC_SIMSR_L,
 346                 .prio   = 0,
 347                 .force  = IPIC_SIFCR_L,
 348                 .bit    = 21,
 349         },
 350         [90] = {
 351                 .pend   = IPIC_SIPNR_H,
 352                 .mask   = IPIC_SIMSR_L,
 353                 .prio   = 0,
 354                 .force  = IPIC_SIFCR_L,
 355                 .bit    = 26,
 356         },
 357         [91] = {
 358                 .pend   = IPIC_SIPNR_H,
 359                 .mask   = IPIC_SIMSR_L,
 360                 .prio   = 0,
 361                 .force  = IPIC_SIFCR_L,
 362                 .bit    = 27,
 363         },
 364 };
 365
 366 static inline u32 ipic_read(volatile u32 __iomem *base, unsigned int reg)
 367 {
 368         return in_be32(base + (reg >> 2));
 369 }
 370
 371 static inline void ipic_write(volatile u32 __iomem *base, unsigned int reg, u32 value)
 372 {
 373         out_be32(base + (reg >> 2), value);
 374 }
 375
 376 static inline struct ipic * ipic_from_irq(unsigned int irq)
 377 {
 378         return primary_ipic;
 379 }
 380
 381 static void ipic_enable_irq(unsigned int irq)
 382 {
 383         struct ipic *ipic = ipic_from_irq(irq);
 384         unsigned int src = irq - ipic->irq_offset;
 385         u32 temp;
 386
 387         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 388         temp |= (1 << (31 - ipic_info[src].bit));
 389         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 390 }
 391
 392 static void ipic_disable_irq(unsigned int irq)
 393 {
 394         struct ipic *ipic = ipic_from_irq(irq);
 395         unsigned int src = irq - ipic->irq_offset;
 396         u32 temp;
 397
 398         temp = ipic_read(ipic->regs, ipic_info[src].mask);
 399         temp &= ~(1 << (31 - ipic_info[src].bit));
 400         ipic_write(ipic->regs, ipic_info[src].mask, temp);
 401 }
 402
 403 static void ipic_disable_irq_and_ack(unsigned int irq)
 404 {
 405         struct ipic *ipic = ipic_from_irq(irq);
 406         unsigned int src = irq - ipic->irq_offset;
 407         u32 temp;
 408
 409         ipic_disable_irq(irq);
 410
 411         temp = ipic_read(ipic->regs, ipic_info[src].pend);
 412         temp |= (1 << (31 - ipic_info[src].bit));
 413         ipic_write(ipic->regs, ipic_info[src].pend, temp);
 414 }
 415
 416 static void ipic_end_irq(unsigned int irq)
 417 {
 418         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 419                 ipic_enable_irq(irq);
 420 }
 421
 422 struct hw_interrupt_type ipic = {
 423         .typename = " IPIC  ",
 424         .enable = ipic_enable_irq,
 425         .disable = ipic_disable_irq,
 426         .ack = ipic_disable_irq_and_ack,
 427         .end = ipic_end_irq,
 428 };
 429
 430 void __init ipic_init(phys_addr_t phys_addr,
 431                 unsigned int flags,
 432                 unsigned int irq_offset,
 433                 unsigned char *senses,
 434                 unsigned int senses_count)
 435 {
 436         u32 i, temp = 0;
 437
 438         primary_ipic = &p_ipic;
 439         primary_ipic->regs = ioremap(phys_addr, MPC83xx_IPIC_SIZE);
 440
 441         primary_ipic->irq_offset = irq_offset;
 442
 443         ipic_write(primary_ipic->regs, IPIC_SICNR, 0x0);
 444
 445         /* default priority scheme is grouped. If spread mode is required
 446          * configure SICFR accordingly */
 447         if (flags & IPIC_SPREADMODE_GRP_A)
 448                 temp |= SICFR_IPSA;
 449         if (flags & IPIC_SPREADMODE_GRP_D)
 450                 temp |= SICFR_IPSD;
 451         if (flags & IPIC_SPREADMODE_MIX_A)
 452                 temp |= SICFR_MPSA;
 453         if (flags & IPIC_SPREADMODE_MIX_B)
 454                 temp |= SICFR_MPSB;
 455
 456         ipic_write(primary_ipic->regs, IPIC_SICNR, temp);
 457
 458         /* handle MCP route */
 459         temp = 0;
 460         if (flags & IPIC_DISABLE_MCP_OUT)
 461                 temp = SERCR_MCPR;
 462         ipic_write(primary_ipic->regs, IPIC_SERCR, temp);
 463
 464         /* handle routing of IRQ0 to MCP */
 465         temp = ipic_read(primary_ipic->regs, IPIC_SEMSR);
 466
 467         if (flags & IPIC_IRQ0_MCP)
 468                 temp |= SEMSR_SIRQ0;
 469         else
 470                 temp &= ~SEMSR_SIRQ0;
 471
 472         ipic_write(primary_ipic->regs, IPIC_SEMSR, temp);
 473
 474         for (i = 0 ; i < NR_IPIC_INTS ; i++) {
 475                 irq_desc[i+irq_offset].handler = &ipic;
 476                 irq_desc[i+irq_offset].status = IRQ_LEVEL;
 477         }
 478
 479         temp = 0;
 480         for (i = 0 ; i < senses_count ; i++) {
 481                 if ((senses[i] & IRQ_SENSE_MASK) == IRQ_SENSE_EDGE) {
 482                         temp |= 1 << (16 - i);
 483                         if (i != 0)
 484                                 irq_desc[i + irq_offset + MPC83xx_IRQ_EXT1 - 1].status = 0;
 485                         else
 486                                 irq_desc[irq_offset + MPC83xx_IRQ_EXT0].status = 0;
 487                 }
 488         }
 489         ipic_write(primary_ipic->regs, IPIC_SECNR, temp);
 490
 491         printk ("IPIC (%d IRQ sources, %d External IRQs) at %p\n", NR_IPIC_INTS,
 492                         senses_count, primary_ipic->regs);
 493 }
 494
 495 int ipic_set_priority(unsigned int irq, unsigned int priority)
 496 {
 497         struct ipic *ipic = ipic_from_irq(irq);
 498         unsigned int src = irq - ipic->irq_offset;
 499         u32 temp;
 500
 501         if (priority > 7)
 502                 return -EINVAL;
 503         if (src > 127)
 504                 return -EINVAL;
 505         if (ipic_info[src].prio == 0)
 506                 return -EINVAL;
 507
 508         temp = ipic_read(ipic->regs, ipic_info[src].prio);
 509
 510         if (priority < 4) {
 511                 temp &= ~(0x7 << (20 + (3 - priority) * 3));
 512                 temp |= ipic_info[src].prio_mask << (20 + (3 - priority) * 3);
 513         } else {
 514                 temp &= ~(0x7 << (4 + (7 - priority) * 3));
 515                 temp |= ipic_info[src].prio_mask << (4 + (7 - priority) * 3);
 516         }
 517
 518         ipic_write(ipic->regs, ipic_info[src].prio, temp);
 519
 520         return 0;
 521 }
 522
 523 void ipic_set_highest_priority(unsigned int irq)
 524 {
 525         struct ipic *ipic = ipic_from_irq(irq);
 526         unsigned int src = irq - ipic->irq_offset;
 527         u32 temp;
 528
 529         temp = ipic_read(ipic->regs, IPIC_SICFR);
 530
 531         /* clear and set HPI */
 532         temp &= 0x7f000000;
 533         temp |= (src & 0x7f) << 24;
 534
 535         ipic_write(ipic->regs, IPIC_SICFR, temp);
 536 }
 537
 538 void ipic_set_default_priority(void)
 539 {
 540         ipic_set_priority(MPC83xx_IRQ_TSEC1_TX, 0);
 541         ipic_set_priority(MPC83xx_IRQ_TSEC1_RX, 1);
 542         ipic_set_priority(MPC83xx_IRQ_TSEC1_ERROR, 2);
 543         ipic_set_priority(MPC83xx_IRQ_TSEC2_TX, 3);
 544         ipic_set_priority(MPC83xx_IRQ_TSEC2_RX, 4);
 545         ipic_set_priority(MPC83xx_IRQ_TSEC2_ERROR, 5);
 546         ipic_set_priority(MPC83xx_IRQ_USB2_DR, 6);
 547         ipic_set_priority(MPC83xx_IRQ_USB2_MPH, 7);
 548
 549         ipic_set_priority(MPC83xx_IRQ_UART1, 0);
 550         ipic_set_priority(MPC83xx_IRQ_UART2, 1);
 551         ipic_set_priority(MPC83xx_IRQ_SEC2, 2);
 552         ipic_set_priority(MPC83xx_IRQ_IIC1, 5);
 553         ipic_set_priority(MPC83xx_IRQ_IIC2, 6);
 554         ipic_set_priority(MPC83xx_IRQ_SPI, 7);
 555         ipic_set_priority(MPC83xx_IRQ_RTC_SEC, 0);
 556         ipic_set_priority(MPC83xx_IRQ_PIT, 1);
 557         ipic_set_priority(MPC83xx_IRQ_PCI1, 2);
 558         ipic_set_priority(MPC83xx_IRQ_PCI2, 3);
 559         ipic_set_priority(MPC83xx_IRQ_EXT0, 4);
 560         ipic_set_priority(MPC83xx_IRQ_EXT1, 5);
 561         ipic_set_priority(MPC83xx_IRQ_EXT2, 6);
 562         ipic_set_priority(MPC83xx_IRQ_EXT3, 7);
 563         ipic_set_priority(MPC83xx_IRQ_RTC_ALR, 0);
 564         ipic_set_priority(MPC83xx_IRQ_MU, 1);
 565         ipic_set_priority(MPC83xx_IRQ_SBA, 2);
 566         ipic_set_priority(MPC83xx_IRQ_DMA, 3);
 567         ipic_set_priority(MPC83xx_IRQ_EXT4, 4);
 568         ipic_set_priority(MPC83xx_IRQ_EXT5, 5);
 569         ipic_set_priority(MPC83xx_IRQ_EXT6, 6);
 570         ipic_set_priority(MPC83xx_IRQ_EXT7, 7);
 571 }
 572
 573 void ipic_enable_mcp(enum ipic_mcp_irq mcp_irq)
 574 {
 575         struct ipic *ipic = primary_ipic;
 576         u32 temp;
 577
 578         temp = ipic_read(ipic->regs, IPIC_SERMR);
 579         temp |= (1 << (31 - mcp_irq));
 580         ipic_write(ipic->regs, IPIC_SERMR, temp);
 581 }
 582
 583 void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq)
 584 {
 585         struct ipic *ipic = primary_ipic;
 586         u32 temp;
 587
 588         temp = ipic_read(ipic->regs, IPIC_SERMR);
 589         temp &= (1 << (31 - mcp_irq));
 590         ipic_write(ipic->regs, IPIC_SERMR, temp);
 591 }
 592
 593 u32 ipic_get_mcp_status(void)
 594 {
 595         return ipic_read(primary_ipic->regs, IPIC_SERMR);
 596 }
 597
 598 void ipic_clear_mcp_status(u32 mask)
 599 {
 600         ipic_write(primary_ipic->regs, IPIC_SERMR, mask);
 601 }
 602
 603 /* Return an interrupt vector or -1 if no interrupt is pending. */
 604 int ipic_get_irq(struct pt_regs *regs)
 605 {
 606         int irq;
 607
 608         irq = ipic_read(primary_ipic->regs, IPIC_SIVCR) & 0x7f;
 609
 610         if (irq == 0)    /* 0 --> no irq is pending */
 611                 irq = -1;
 612
 613         return irq;
 614 }
 615
 616 static struct sysdev_class ipic_sysclass = {
 617         set_kset_name("ipic"),
 618 };
 619
 620 static struct sys_device device_ipic = {
 621         .id             = 0,
 622         .cls            = &ipic_sysclass,
 623 };
 624
 625 static int __init init_ipic_sysfs(void)
 626 {
 627         int rc;
 628
 629         if (!primary_ipic->regs)
 630                 return -ENODEV;
 631         printk(KERN_DEBUG "Registering ipic with sysfs...\n");
 632
 633         rc = sysdev_class_register(&ipic_sysclass);
 634         if (rc) {
 635                 printk(KERN_ERR "Failed registering ipic sys class\n");
 636                 return -ENODEV;
 637         }
 638         rc = sysdev_register(&device_ipic);
 639         if (rc) {
 640                 printk(KERN_ERR "Failed registering ipic sys device\n");
 641                 return -ENODEV;
 642         }
 643         return 0;
 644 }
 645
 646 subsys_initcall(init_ipic_sysfs);