arch/mips/sgi-ip32/ip32-irq.c

   1 /*
   2  * Code to handle IP32 IRQs
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2000 Harald Koerfgen
   9  * Copyright (C) 2001 Keith M Wesolowski
  10  */
  11 #include <linux/init.h>
  12 #include <linux/kernel_stat.h>
  13 #include <linux/types.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/bitops.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/mm.h>
  20 #include <linux/random.h>
  21 #include <linux/sched.h>
  22
  23 #include <asm/irq_cpu.h>
  24 #include <asm/mipsregs.h>
  25 #include <asm/signal.h>
  26 #include <asm/system.h>
  27 #include <asm/time.h>
  28 #include <asm/ip32/crime.h>
  29 #include <asm/ip32/mace.h>
  30 #include <asm/ip32/ip32_ints.h>
  31
  32 /* issue a PIO read to make sure no PIO writes are pending */
  33 static void inline flush_crime_bus(void)
  34 {
  35         crime->control;
  36 }
  37
  38 static void inline flush_mace_bus(void)
  39 {
  40         mace->perif.ctrl.misc;
  41 }
  42
  43 /*
  44  * O2 irq map
  45  *
  46  * IP0 -> software (ignored)
  47  * IP1 -> software (ignored)
  48  * IP2 -> (irq0) C crime 1.1 all interrupts; crime 1.5 ???
  49  * IP3 -> (irq1) X unknown
  50  * IP4 -> (irq2) X unknown
  51  * IP5 -> (irq3) X unknown
  52  * IP6 -> (irq4) X unknown
  53  * IP7 -> (irq5) 7 CPU count/compare timer (system timer)
  54  *
  55  * crime: (C)
  56  *
  57  * CRIME_INT_STAT 31:0:
  58  *
  59  * 0  ->  8  Video in 1
  60  * 1  ->  9 Video in 2
  61  * 2  -> 10  Video out
  62  * 3  -> 11  Mace ethernet
  63  * 4  -> S  SuperIO sub-interrupt
  64  * 5  -> M  Miscellaneous sub-interrupt
  65  * 6  -> A  Audio sub-interrupt
  66  * 7  -> 15  PCI bridge errors
  67  * 8  -> 16  PCI SCSI aic7xxx 0
  68  * 9  -> 17 PCI SCSI aic7xxx 1
  69  * 10 -> 18 PCI slot 0
  70  * 11 -> 19 unused (PCI slot 1)
  71  * 12 -> 20 unused (PCI slot 2)
  72  * 13 -> 21 unused (PCI shared 0)
  73  * 14 -> 22 unused (PCI shared 1)
  74  * 15 -> 23 unused (PCI shared 2)
  75  * 16 -> 24 GBE0 (E)
  76  * 17 -> 25 GBE1 (E)
  77  * 18 -> 26 GBE2 (E)
  78  * 19 -> 27 GBE3 (E)
  79  * 20 -> 28 CPU errors
  80  * 21 -> 29 Memory errors
  81  * 22 -> 30 RE empty edge (E)
  82  * 23 -> 31 RE full edge (E)
  83  * 24 -> 32 RE idle edge (E)
  84  * 25 -> 33 RE empty level
  85  * 26 -> 34 RE full level
  86  * 27 -> 35 RE idle level
  87  * 28 -> 36 unused (software 0) (E)
  88  * 29 -> 37 unused (software 1) (E)
  89  * 30 -> 38 unused (software 2) - crime 1.5 CPU SysCorError (E)
  90  * 31 -> 39 VICE
  91  *
  92  * S, M, A: Use the MACE ISA interrupt register
  93  * MACE_ISA_INT_STAT 31:0
  94  *
  95  * 0-7 -> 40-47 Audio
  96  * 8 -> 48 RTC
  97  * 9 -> 49 Keyboard
  98  * 10 -> X Keyboard polled
  99  * 11 -> 51 Mouse
 100  * 12 -> X Mouse polled
 101  * 13-15 -> 53-55 Count/compare timers
 102  * 16-19 -> 56-59 Parallel (16 E)
 103  * 20-25 -> 60-62 Serial 1 (22 E)
 104  * 26-31 -> 66-71 Serial 2 (28 E)
 105  *
 106  * Note that this means IRQs 12-14, 50, and 52 do not exist.  This is a
 107  * different IRQ map than IRIX uses, but that's OK as Linux irq handling
 108  * is quite different anyway.
 109  */
 110
 111 /* Some initial interrupts to set up */
 112 extern irqreturn_t crime_memerr_intr(int irq, void *dev_id);
 113 extern irqreturn_t crime_cpuerr_intr(int irq, void *dev_id);
 114
 115 struct irqaction memerr_irq = {
 116         .handler = crime_memerr_intr,
 117         .flags = IRQF_DISABLED,
 118         .name = "CRIME memory error",
 119 };
 120
 121 struct irqaction cpuerr_irq = {
 122         .handler = crime_cpuerr_intr,
 123         .flags = IRQF_DISABLED,
 124         .name = "CRIME CPU error",
 125 };
 126
 127 /*
 128  * This is for pure CRIME interrupts - ie not MACE.  The advantage?
 129  * We get to split the register in half and do faster lookups.
 130  */
 131
 132 static uint64_t crime_mask;
 133
 134 static inline void crime_enable_irq(unsigned int irq)
 135 {
 136         unsigned int bit = irq - CRIME_IRQ_BASE;
 137
 138         crime_mask |= 1 << bit;
 139         crime->imask = crime_mask;
 140 }
 141
 142 static inline void crime_disable_irq(unsigned int irq)
 143 {
 144         unsigned int bit = irq - CRIME_IRQ_BASE;
 145
 146         crime_mask &= ~(1 << bit);
 147         crime->imask = crime_mask;
 148         flush_crime_bus();
 149 }
 150
 151 static void crime_level_mask_and_ack_irq(unsigned int irq)
 152 {
 153         crime_disable_irq(irq);
 154 }
 155
 156 static void crime_level_end_irq(unsigned int irq)
 157 {
 158         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 159                 crime_enable_irq(irq);
 160 }
 161
 162 static struct irq_chip crime_level_interrupt = {
 163         .name           = "IP32 CRIME",
 164         .ack            = crime_level_mask_and_ack_irq,
 165         .mask           = crime_disable_irq,
 166         .mask_ack       = crime_level_mask_and_ack_irq,
 167         .unmask         = crime_enable_irq,
 168         .end            = crime_level_end_irq,
 169 };
 170
 171 static void crime_edge_mask_and_ack_irq(unsigned int irq)
 172 {
 173         unsigned int bit = irq - CRIME_IRQ_BASE;
 174         uint64_t crime_int;
 175
 176         /* Edge triggered interrupts must be cleared. */
 177
 178         crime_int = crime->hard_int;
 179         crime_int &= ~(1 << bit);
 180         crime->hard_int = crime_int;
 181
 182         crime_disable_irq(irq);
 183 }
 184
 185 static void crime_edge_end_irq(unsigned int irq)
 186 {
 187         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 188                 crime_enable_irq(irq);
 189 }
 190
 191 static struct irq_chip crime_edge_interrupt = {
 192         .name           = "IP32 CRIME",
 193         .ack            = crime_edge_mask_and_ack_irq,
 194         .mask           = crime_disable_irq,
 195         .mask_ack       = crime_edge_mask_and_ack_irq,
 196         .unmask         = crime_enable_irq,
 197         .end            = crime_edge_end_irq,
 198 };
 199
 200 /*
 201  * This is for MACE PCI interrupts.  We can decrease bus traffic by masking
 202  * as close to the source as possible.  This also means we can take the
 203  * next chunk of the CRIME register in one piece.
 204  */
 205
 206 static unsigned long macepci_mask;
 207
 208 static void enable_macepci_irq(unsigned int irq)
 209 {
 210         macepci_mask |= MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ);
 211         mace->pci.control = macepci_mask;
 212         crime_mask |= 1 << (irq - CRIME_IRQ_BASE);
 213         crime->imask = crime_mask;
 214 }
 215
 216 static void disable_macepci_irq(unsigned int irq)
 217 {
 218         crime_mask &= ~(1 << (irq - CRIME_IRQ_BASE));
 219         crime->imask = crime_mask;
 220         flush_crime_bus();
 221         macepci_mask &= ~MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ);
 222         mace->pci.control = macepci_mask;
 223         flush_mace_bus();
 224 }
 225
 226 static void end_macepci_irq(unsigned int irq)
 227 {
 228         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 229                 enable_macepci_irq(irq);
 230 }
 231
 232 static struct irq_chip ip32_macepci_interrupt = {
 233         .name = "IP32 MACE PCI",
 234         .ack = disable_macepci_irq,
 235         .mask = disable_macepci_irq,
 236         .mask_ack = disable_macepci_irq,
 237         .unmask = enable_macepci_irq,
 238         .end = end_macepci_irq,
 239 };
 240
 241 /* This is used for MACE ISA interrupts.  That means bits 4-6 in the
 242  * CRIME register.
 243  */
 244
 245 #define MACEISA_AUDIO_INT       (MACEISA_AUDIO_SW_INT |         \
 246                                  MACEISA_AUDIO_SC_INT |         \
 247                                  MACEISA_AUDIO1_DMAT_INT |      \
 248                                  MACEISA_AUDIO1_OF_INT |        \
 249                                  MACEISA_AUDIO2_DMAT_INT |      \
 250                                  MACEISA_AUDIO2_MERR_INT |      \
 251                                  MACEISA_AUDIO3_DMAT_INT |      \
 252                                  MACEISA_AUDIO3_MERR_INT)
 253 #define MACEISA_MISC_INT        (MACEISA_RTC_INT |              \
 254                                  MACEISA_KEYB_INT |             \
 255                                  MACEISA_KEYB_POLL_INT |        \
 256                                  MACEISA_MOUSE_INT |            \
 257                                  MACEISA_MOUSE_POLL_INT |       \
 258                                  MACEISA_TIMER0_INT |           \
 259                                  MACEISA_TIMER1_INT |           \
 260                                  MACEISA_TIMER2_INT)
 261 #define MACEISA_SUPERIO_INT     (MACEISA_PARALLEL_INT |         \
 262                                  MACEISA_PAR_CTXA_INT |         \
 263                                  MACEISA_PAR_CTXB_INT |         \
 264                                  MACEISA_PAR_MERR_INT |         \
 265                                  MACEISA_SERIAL1_INT |          \
 266                                  MACEISA_SERIAL1_TDMAT_INT |    \
 267                                  MACEISA_SERIAL1_TDMAPR_INT |   \
 268                                  MACEISA_SERIAL1_TDMAME_INT |   \
 269                                  MACEISA_SERIAL1_RDMAT_INT |    \
 270                                  MACEISA_SERIAL1_RDMAOR_INT |   \
 271                                  MACEISA_SERIAL2_INT |          \
 272                                  MACEISA_SERIAL2_TDMAT_INT |    \
 273                                  MACEISA_SERIAL2_TDMAPR_INT |   \
 274                                  MACEISA_SERIAL2_TDMAME_INT |   \
 275                                  MACEISA_SERIAL2_RDMAT_INT |    \
 276                                  MACEISA_SERIAL2_RDMAOR_INT)
 277
 278 static unsigned long maceisa_mask;
 279
 280 static void enable_maceisa_irq(unsigned int irq)
 281 {
 282         unsigned int crime_int = 0;
 283
 284         pr_debug("maceisa enable: %u\n", irq);
 285
 286         switch (irq) {
 287         case MACEISA_AUDIO_SW_IRQ ... MACEISA_AUDIO3_MERR_IRQ:
 288                 crime_int = MACE_AUDIO_INT;
 289                 break;
 290         case MACEISA_RTC_IRQ ... MACEISA_TIMER2_IRQ:
 291                 crime_int = MACE_MISC_INT;
 292                 break;
 293         case MACEISA_PARALLEL_IRQ ... MACEISA_SERIAL2_RDMAOR_IRQ:
 294                 crime_int = MACE_SUPERIO_INT;
 295                 break;
 296         }
 297         pr_debug("crime_int %08x enabled\n", crime_int);
 298         crime_mask |= crime_int;
 299         crime->imask = crime_mask;
 300         maceisa_mask |= 1 << (irq - MACEISA_AUDIO_SW_IRQ);
 301         mace->perif.ctrl.imask = maceisa_mask;
 302 }
 303
 304 static void disable_maceisa_irq(unsigned int irq)
 305 {
 306         unsigned int crime_int = 0;
 307
 308         maceisa_mask &= ~(1 << (irq - MACEISA_AUDIO_SW_IRQ));
 309         if (!(maceisa_mask & MACEISA_AUDIO_INT))
 310                 crime_int |= MACE_AUDIO_INT;
 311         if (!(maceisa_mask & MACEISA_MISC_INT))
 312                 crime_int |= MACE_MISC_INT;
 313         if (!(maceisa_mask & MACEISA_SUPERIO_INT))
 314                 crime_int |= MACE_SUPERIO_INT;
 315         crime_mask &= ~crime_int;
 316         crime->imask = crime_mask;
 317         flush_crime_bus();
 318         mace->perif.ctrl.imask = maceisa_mask;
 319         flush_mace_bus();
 320 }
 321
 322 static void mask_and_ack_maceisa_irq(unsigned int irq)
 323 {
 324         unsigned long mace_int;
 325
 326         switch (irq) {
 327         case MACEISA_PARALLEL_IRQ:
 328         case MACEISA_SERIAL1_TDMAPR_IRQ:
 329         case MACEISA_SERIAL2_TDMAPR_IRQ:
 330                 /* edge triggered */
 331                 mace_int = mace->perif.ctrl.istat;
 332                 mace_int &= ~(1 << (irq - MACEISA_AUDIO_SW_IRQ));
 333                 mace->perif.ctrl.istat = mace_int;
 334                 break;
 335         }
 336         disable_maceisa_irq(irq);
 337 }
 338
 339 static void end_maceisa_irq(unsigned irq)
 340 {
 341         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
 342                 enable_maceisa_irq(irq);
 343 }
 344
 345 static struct irq_chip ip32_maceisa_interrupt = {
 346         .name           = "IP32 MACE ISA",
 347         .ack            = mask_and_ack_maceisa_irq,
 348         .mask           = disable_maceisa_irq,
 349         .mask_ack       = mask_and_ack_maceisa_irq,
 350         .unmask         = enable_maceisa_irq,
 351         .end            = end_maceisa_irq,
 352 };
 353
 354 /* This is used for regular non-ISA, non-PCI MACE interrupts.  That means
 355  * bits 0-3 and 7 in the CRIME register.
 356  */
 357
 358 static void enable_mace_irq(unsigned int irq)
 359 {
 360         unsigned int bit = irq - CRIME_IRQ_BASE;
 361
 362         crime_mask |= (1 << bit);
 363         crime->imask = crime_mask;
 364 }
 365
 366 static void disable_mace_irq(unsigned int irq)
 367 {
 368         unsigned int bit = irq - CRIME_IRQ_BASE;
 369
 370         crime_mask &= ~(1 << bit);
 371         crime->imask = crime_mask;
 372         flush_crime_bus();
 373 }
 374
 375 static void end_mace_irq(unsigned int irq)
 376 {
 377         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 378                 enable_mace_irq(irq);
 379 }
 380
 381 static struct irq_chip ip32_mace_interrupt = {
 382         .name = "IP32 MACE",
 383         .ack = disable_mace_irq,
 384         .mask = disable_mace_irq,
 385         .mask_ack = disable_mace_irq,
 386         .unmask = enable_mace_irq,
 387         .end = end_mace_irq,
 388 };
 389
 390 static void ip32_unknown_interrupt(void)
 391 {
 392         printk("Unknown interrupt occurred!\n");
 393         printk("cp0_status: %08x\n", read_c0_status());
 394         printk("cp0_cause: %08x\n", read_c0_cause());
 395         printk("CRIME intr mask: %016lx\n", crime->imask);
 396         printk("CRIME intr status: %016lx\n", crime->istat);
 397         printk("CRIME hardware intr register: %016lx\n", crime->hard_int);
 398         printk("MACE ISA intr mask: %08lx\n", mace->perif.ctrl.imask);
 399         printk("MACE ISA intr status: %08lx\n", mace->perif.ctrl.istat);
 400         printk("MACE PCI control register: %08x\n", mace->pci.control);
 401
 402         printk("Register dump:\n");
 403         show_regs(get_irq_regs());
 404
 405         printk("Please mail this report to linux-mips@linux-mips.org\n");
 406         printk("Spinning...");
 407         while(1) ;
 408 }
 409
 410 /* CRIME 1.1 appears to deliver all interrupts to this one pin. */
 411 /* change this to loop over all edge-triggered irqs, exception masked out ones */
 412 static void ip32_irq0(void)
 413 {
 414         uint64_t crime_int;
 415         int irq = 0;
 416
 417         /*
 418          * Sanity check interrupt numbering enum.
 419          * MACE got 32 interrupts and there are 32 MACE ISA interrupts daisy
 420          * chained.
 421          */
 422         BUILD_BUG_ON(CRIME_VICE_IRQ - MACE_VID_IN1_IRQ != 31);
 423         BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
 424
 425         crime_int = crime->istat & crime_mask;
 426
 427         /* crime sometime delivers spurious interrupts, ignore them */
 428         if (unlikely(crime_int == 0))
 429                 return;
 430
 431         irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
 432
 433         if (crime_int & CRIME_MACEISA_INT_MASK) {
 434                 unsigned long mace_int = mace->perif.ctrl.istat;
 435                 irq = __ffs(mace_int & maceisa_mask) + MACEISA_AUDIO_SW_IRQ;
 436         }
 437
 438         pr_debug("*irq %u*\n", irq);
 439         do_IRQ(irq);
 440 }
 441
 442 static void ip32_irq1(void)
 443 {
 444         ip32_unknown_interrupt();
 445 }
 446
 447 static void ip32_irq2(void)
 448 {
 449         ip32_unknown_interrupt();
 450 }
 451
 452 static void ip32_irq3(void)
 453 {
 454         ip32_unknown_interrupt();
 455 }
 456
 457 static void ip32_irq4(void)
 458 {
 459         ip32_unknown_interrupt();
 460 }
 461
 462 static void ip32_irq5(void)
 463 {
 464         do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 465 }
 466
 467 asmlinkage void plat_irq_dispatch(void)
 468 {
 469         unsigned int pending = read_c0_status() & read_c0_cause();
 470
 471         if (likely(pending & IE_IRQ0))
 472                 ip32_irq0();
 473         else if (unlikely(pending & IE_IRQ1))
 474                 ip32_irq1();
 475         else if (unlikely(pending & IE_IRQ2))
 476                 ip32_irq2();
 477         else if (unlikely(pending & IE_IRQ3))
 478                 ip32_irq3();
 479         else if (unlikely(pending & IE_IRQ4))
 480                 ip32_irq4();
 481         else if (likely(pending & IE_IRQ5))
 482                 ip32_irq5();
 483 }
 484
 485 void __init arch_init_irq(void)
 486 {
 487         unsigned int irq;
 488
 489         /* Install our interrupt handler, then clear and disable all
 490          * CRIME and MACE interrupts. */
 491         crime->imask = 0;
 492         crime->hard_int = 0;
 493         crime->soft_int = 0;
 494         mace->perif.ctrl.istat = 0;
 495         mace->perif.ctrl.imask = 0;
 496
 497         mips_cpu_irq_init();
 498         for (irq = CRIME_IRQ_BASE; irq <= IP32_IRQ_MAX; irq++) {
 499                 switch (irq) {
 500                 case MACE_VID_IN1_IRQ ... MACE_PCI_BRIDGE_IRQ:
 501                         set_irq_chip(irq, &ip32_mace_interrupt);
 502                         break;
 503                 case MACEPCI_SCSI0_IRQ ...  MACEPCI_SHARED2_IRQ:
 504                         set_irq_chip(irq, &ip32_macepci_interrupt);
 505                         break;
 506                 case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ:
 507                         set_irq_chip(irq, &crime_edge_interrupt);
 508                         break;
 509                 case CRIME_CPUERR_IRQ:
 510                 case CRIME_MEMERR_IRQ:
 511                         set_irq_chip(irq, &crime_level_interrupt);
 512                         break;
 513                 case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ:
 514                 case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ:
 515                         set_irq_chip(irq, &crime_edge_interrupt);
 516                         break;
 517                 case CRIME_VICE_IRQ:
 518                         set_irq_chip(irq, &crime_edge_interrupt);
 519                         break;
 520                 default:
 521                         set_irq_chip(irq, &ip32_maceisa_interrupt);
 522                         break;
 523                 }
 524         }
 525         setup_irq(CRIME_MEMERR_IRQ, &memerr_irq);
 526         setup_irq(CRIME_CPUERR_IRQ, &cpuerr_irq);
 527
 528 #define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
 529         change_c0_status(ST0_IM, ALLINTS);
 530 }