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