arch/mips/mti-malta/malta-int.c

   1 /*
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
   4  * Copyright (C) 2001 Ralf Baechle
   5  *
   6  *  This program is free software; you can distribute it and/or modify it
   7  *  under the terms of the GNU General Public License (Version 2) as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope it will be useful, but WITHOUT
  11  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  *  for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  18  *
  19  * Routines for generic manipulation of the interrupts found on the MIPS
  20  * Malta board.
  21  * The interrupt controller is located in the South Bridge a PIIX4 device
  22  * with two internal 82C95 interrupt controllers.
  23  */
  24 #include <linux/init.h>
  25 #include <linux/irq.h>
  26 #include <linux/sched.h>
  27 #include <linux/smp.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/io.h>
  30 #include <linux/kernel_stat.h>
  31 #include <linux/kernel.h>
  32 #include <linux/random.h>
  33
  34 #include <asm/traps.h>
  35 #include <asm/i8259.h>
  36 #include <asm/irq_cpu.h>
  37 #include <asm/irq_regs.h>
  38 #include <asm/mips-boards/malta.h>
  39 #include <asm/mips-boards/maltaint.h>
  40 #include <asm/mips-boards/piix4.h>
  41 #include <asm/gt64120.h>
  42 #include <asm/mips-boards/generic.h>
  43 #include <asm/mips-boards/msc01_pci.h>
  44 #include <asm/msc01_ic.h>
  45 #include <asm/gic.h>
  46 #include <asm/gcmpregs.h>
  47 #include <asm/setup.h>
  48
  49 int gcmp_present = -1;
  50 static unsigned long _msc01_biu_base;
  51 static unsigned long _gcmp_base;
  52 static unsigned int ipi_map[NR_CPUS];
  53
  54 static DEFINE_RAW_SPINLOCK(mips_irq_lock);
  55
  56 static inline int mips_pcibios_iack(void)
  57 {
  58         int irq;
  59
  60         /*
  61          * Determine highest priority pending interrupt by performing
  62          * a PCI Interrupt Acknowledge cycle.
  63          */
  64         switch (mips_revision_sconid) {
  65         case MIPS_REVISION_SCON_SOCIT:
  66         case MIPS_REVISION_SCON_ROCIT:
  67         case MIPS_REVISION_SCON_SOCITSC:
  68         case MIPS_REVISION_SCON_SOCITSCP:
  69                 MSC_READ(MSC01_PCI_IACK, irq);
  70                 irq &= 0xff;
  71                 break;
  72         case MIPS_REVISION_SCON_GT64120:
  73                 irq = GT_READ(GT_PCI0_IACK_OFS);
  74                 irq &= 0xff;
  75                 break;
  76         case MIPS_REVISION_SCON_BONITO:
  77                 /* The following will generate a PCI IACK cycle on the
  78                  * Bonito controller. It's a little bit kludgy, but it
  79                  * was the easiest way to implement it in hardware at
  80                  * the given time.
  81                  */
  82                 BONITO_PCIMAP_CFG = 0x20000;
  83
  84                 /* Flush Bonito register block */
  85                 (void) BONITO_PCIMAP_CFG;
  86                 iob();    /* sync */
  87
  88                 irq = __raw_readl((u32 *)_pcictrl_bonito_pcicfg);
  89                 iob();    /* sync */
  90                 irq &= 0xff;
  91                 BONITO_PCIMAP_CFG = 0;
  92                 break;
  93         default:
  94                 printk(KERN_WARNING "Unknown system controller.\n");
  95                 return -1;
  96         }
  97         return irq;
  98 }
  99
 100 static inline int get_int(void)
 101 {
 102         unsigned long flags;
 103         int irq;
 104         raw_spin_lock_irqsave(&mips_irq_lock, flags);
 105
 106         irq = mips_pcibios_iack();
 107
 108         /*
 109          * The only way we can decide if an interrupt is spurious
 110          * is by checking the 8259 registers.  This needs a spinlock
 111          * on an SMP system,  so leave it up to the generic code...
 112          */
 113
 114         raw_spin_unlock_irqrestore(&mips_irq_lock, flags);
 115
 116         return irq;
 117 }
 118
 119 static void malta_hw0_irqdispatch(void)
 120 {
 121         int irq;
 122
 123         irq = get_int();
 124         if (irq < 0) {
 125                 /* interrupt has already been cleared */
 126                 return;
 127         }
 128
 129         do_IRQ(MALTA_INT_BASE + irq);
 130 }
 131
 132 static void malta_ipi_irqdispatch(void)
 133 {
 134         int irq;
 135
 136         if (gic_compare_int())
 137                 do_IRQ(MIPS_GIC_IRQ_BASE);
 138
 139         irq = gic_get_int();
 140         if (irq < 0)
 141                 return;  /* interrupt has already been cleared */
 142
 143         do_IRQ(MIPS_GIC_IRQ_BASE + irq);
 144 }
 145
 146 static void corehi_irqdispatch(void)
 147 {
 148         unsigned int intedge, intsteer, pcicmd, pcibadaddr;
 149         unsigned int pcimstat, intisr, inten, intpol;
 150         unsigned int intrcause, datalo, datahi;
 151         struct pt_regs *regs = get_irq_regs();
 152
 153         printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
 154         printk(KERN_EMERG "epc   : %08lx\nStatus: %08lx\n"
 155                         "Cause : %08lx\nbadVaddr : %08lx\n",
 156                         regs->cp0_epc, regs->cp0_status,
 157                         regs->cp0_cause, regs->cp0_badvaddr);
 158
 159         /* Read all the registers and then print them as there is a
 160            problem with interspersed printk's upsetting the Bonito controller.
 161            Do it for the others too.
 162         */
 163
 164         switch (mips_revision_sconid) {
 165         case MIPS_REVISION_SCON_SOCIT:
 166         case MIPS_REVISION_SCON_ROCIT:
 167         case MIPS_REVISION_SCON_SOCITSC:
 168         case MIPS_REVISION_SCON_SOCITSCP:
 169                 ll_msc_irq();
 170                 break;
 171         case MIPS_REVISION_SCON_GT64120:
 172                 intrcause = GT_READ(GT_INTRCAUSE_OFS);
 173                 datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
 174                 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
 175                 printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
 176                 printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
 177                                 datahi, datalo);
 178                 break;
 179         case MIPS_REVISION_SCON_BONITO:
 180                 pcibadaddr = BONITO_PCIBADADDR;
 181                 pcimstat = BONITO_PCIMSTAT;
 182                 intisr = BONITO_INTISR;
 183                 inten = BONITO_INTEN;
 184                 intpol = BONITO_INTPOL;
 185                 intedge = BONITO_INTEDGE;
 186                 intsteer = BONITO_INTSTEER;
 187                 pcicmd = BONITO_PCICMD;
 188                 printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
 189                 printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
 190                 printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
 191                 printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
 192                 printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
 193                 printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
 194                 printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
 195                 printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
 196                 break;
 197         }
 198
 199         die("CoreHi interrupt", regs);
 200 }
 201
 202 static inline int clz(unsigned long x)
 203 {
 204         __asm__(
 205         "       .set    push                                    \n"
 206         "       .set    mips32                                  \n"
 207         "       clz     %0, %1                                  \n"
 208         "       .set    pop                                     \n"
 209         : "=r" (x)
 210         : "r" (x));
 211
 212         return x;
 213 }
 214
 215 /*
 216  * Version of ffs that only looks at bits 12..15.
 217  */
 218 static inline unsigned int irq_ffs(unsigned int pending)
 219 {
 220 #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
 221         return -clz(pending) + 31 - CAUSEB_IP;
 222 #else
 223         unsigned int a0 = 7;
 224         unsigned int t0;
 225
 226         t0 = pending & 0xf000;
 227         t0 = t0 < 1;
 228         t0 = t0 << 2;
 229         a0 = a0 - t0;
 230         pending = pending << t0;
 231
 232         t0 = pending & 0xc000;
 233         t0 = t0 < 1;
 234         t0 = t0 << 1;
 235         a0 = a0 - t0;
 236         pending = pending << t0;
 237
 238         t0 = pending & 0x8000;
 239         t0 = t0 < 1;
 240         /* t0 = t0 << 2; */
 241         a0 = a0 - t0;
 242         /* pending = pending << t0; */
 243
 244         return a0;
 245 #endif
 246 }
 247
 248 /*
 249  * IRQs on the Malta board look basically (barring software IRQs which we
 250  * don't use at all and all external interrupt sources are combined together
 251  * on hardware interrupt 0 (MIPS IRQ 2)) like:
 252  *
 253  *      MIPS IRQ        Source
 254  *      --------        ------
 255  *             0        Software (ignored)
 256  *             1        Software (ignored)
 257  *             2        Combined hardware interrupt (hw0)
 258  *             3        Hardware (ignored)
 259  *             4        Hardware (ignored)
 260  *             5        Hardware (ignored)
 261  *             6        Hardware (ignored)
 262  *             7        R4k timer (what we use)
 263  *
 264  * We handle the IRQ according to _our_ priority which is:
 265  *
 266  * Highest ----     R4k Timer
 267  * Lowest  ----     Combined hardware interrupt
 268  *
 269  * then we just return, if multiple IRQs are pending then we will just take
 270  * another exception, big deal.
 271  */
 272
 273 asmlinkage void plat_irq_dispatch(void)
 274 {
 275         unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
 276         int irq;
 277
 278         if (unlikely(!pending)) {
 279                 spurious_interrupt();
 280                 return;
 281         }
 282
 283         irq = irq_ffs(pending);
 284
 285         if (irq == MIPSCPU_INT_I8259A)
 286                 malta_hw0_irqdispatch();
 287         else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
 288                 malta_ipi_irqdispatch();
 289         else
 290                 do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 291 }
 292
 293 #ifdef CONFIG_MIPS_MT_SMP
 294
 295
 296 #define GIC_MIPS_CPU_IPI_RESCHED_IRQ    3
 297 #define GIC_MIPS_CPU_IPI_CALL_IRQ       4
 298
 299 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
 300 #define C_RESCHED C_SW0
 301 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for resched */
 302 #define C_CALL C_SW1
 303 static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
 304
 305 static void ipi_resched_dispatch(void)
 306 {
 307         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
 308 }
 309
 310 static void ipi_call_dispatch(void)
 311 {
 312         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
 313 }
 314
 315 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
 316 {
 317         scheduler_ipi();
 318
 319         return IRQ_HANDLED;
 320 }
 321
 322 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
 323 {
 324         smp_call_function_interrupt();
 325
 326         return IRQ_HANDLED;
 327 }
 328
 329 static struct irqaction irq_resched = {
 330         .handler        = ipi_resched_interrupt,
 331         .flags          = IRQF_PERCPU,
 332         .name           = "IPI_resched"
 333 };
 334
 335 static struct irqaction irq_call = {
 336         .handler        = ipi_call_interrupt,
 337         .flags          = IRQF_PERCPU,
 338         .name           = "IPI_call"
 339 };
 340 #endif /* CONFIG_MIPS_MT_SMP */
 341
 342 static int gic_resched_int_base;
 343 static int gic_call_int_base;
 344 #define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu))
 345 #define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu))
 346
 347 unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
 348 {
 349         return GIC_CALL_INT(cpu);
 350 }
 351
 352 unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
 353 {
 354         return GIC_RESCHED_INT(cpu);
 355 }
 356
 357 static struct irqaction i8259irq = {
 358         .handler = no_action,
 359         .name = "XT-PIC cascade",
 360         .flags = IRQF_NO_THREAD,
 361 };
 362
 363 static struct irqaction corehi_irqaction = {
 364         .handler = no_action,
 365         .name = "CoreHi",
 366         .flags = IRQF_NO_THREAD,
 367 };
 368
 369 static msc_irqmap_t __initdata msc_irqmap[] = {
 370         {MSC01C_INT_TMR,                MSC01_IRQ_EDGE, 0},
 371         {MSC01C_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 372 };
 373 static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
 374
 375 static msc_irqmap_t __initdata msc_eicirqmap[] = {
 376         {MSC01E_INT_SW0,                MSC01_IRQ_LEVEL, 0},
 377         {MSC01E_INT_SW1,                MSC01_IRQ_LEVEL, 0},
 378         {MSC01E_INT_I8259A,             MSC01_IRQ_LEVEL, 0},
 379         {MSC01E_INT_SMI,                MSC01_IRQ_LEVEL, 0},
 380         {MSC01E_INT_COREHI,             MSC01_IRQ_LEVEL, 0},
 381         {MSC01E_INT_CORELO,             MSC01_IRQ_LEVEL, 0},
 382         {MSC01E_INT_TMR,                MSC01_IRQ_EDGE, 0},
 383         {MSC01E_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 384         {MSC01E_INT_PERFCTR,            MSC01_IRQ_LEVEL, 0},
 385         {MSC01E_INT_CPUCTR,             MSC01_IRQ_LEVEL, 0}
 386 };
 387
 388 static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
 389
 390 /*
 391  * This GIC specific tabular array defines the association between External
 392  * Interrupts and CPUs/Core Interrupts. The nature of the External
 393  * Interrupts is also defined here - polarity/trigger.
 394  */
 395
 396 #define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
 397 #define X GIC_UNUSED
 398
 399 static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
 400         { X, X,            X,           X,              0 },
 401         { X, X,            X,           X,              0 },
 402         { X, X,            X,           X,              0 },
 403         { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 404         { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 405         { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 406         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 407         { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 408         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 409         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 410         { X, X,            X,           X,              0 },
 411         { X, X,            X,           X,              0 },
 412         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 413         { 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 414         { 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 415         { X, X,            X,           X,              0 },
 416         /* The remainder of this table is initialised by fill_ipi_map */
 417 };
 418 #undef X
 419
 420 /*
 421  * GCMP needs to be detected before any SMP initialisation
 422  */
 423 int __init gcmp_probe(unsigned long addr, unsigned long size)
 424 {
 425         if (mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) {
 426                 gcmp_present = 0;
 427                 return gcmp_present;
 428         }
 429
 430         if (gcmp_present >= 0)
 431                 return gcmp_present;
 432
 433         _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
 434         _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
 435         gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
 436
 437         if (gcmp_present)
 438                 pr_debug("GCMP present\n");
 439         return gcmp_present;
 440 }
 441
 442 /* Return the number of IOCU's present */
 443 int __init gcmp_niocu(void)
 444 {
 445   return gcmp_present ?
 446     (GCMPGCB(GC) & GCMP_GCB_GC_NUMIOCU_MSK) >> GCMP_GCB_GC_NUMIOCU_SHF :
 447     0;
 448 }
 449
 450 /* Set GCMP region attributes */
 451 void __init gcmp_setregion(int region, unsigned long base,
 452                            unsigned long mask, int type)
 453 {
 454         GCMPGCBn(CMxBASE, region) = base;
 455         GCMPGCBn(CMxMASK, region) = mask | type;
 456 }
 457
 458 #if defined(CONFIG_MIPS_MT_SMP)
 459 static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin)
 460 {
 461         int intr = baseintr + cpu;
 462         gic_intr_map[intr].cpunum = cpu;
 463         gic_intr_map[intr].pin = cpupin;
 464         gic_intr_map[intr].polarity = GIC_POL_POS;
 465         gic_intr_map[intr].trigtype = GIC_TRIG_EDGE;
 466         gic_intr_map[intr].flags = GIC_FLAG_IPI;
 467         ipi_map[cpu] |= (1 << (cpupin + 2));
 468 }
 469
 470 static void __init fill_ipi_map(void)
 471 {
 472         int cpu;
 473
 474         for (cpu = 0; cpu < NR_CPUS; cpu++) {
 475                 fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1);
 476                 fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2);
 477         }
 478 }
 479 #endif
 480
 481 void __init arch_init_ipiirq(int irq, struct irqaction *action)
 482 {
 483         setup_irq(irq, action);
 484         irq_set_handler(irq, handle_percpu_irq);
 485 }
 486
 487 void __init arch_init_irq(void)
 488 {
 489         init_i8259_irqs();
 490
 491         if (!cpu_has_veic)
 492                 mips_cpu_irq_init();
 493
 494         if (gcmp_present)  {
 495                 GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
 496                 gic_present = 1;
 497         } else {
 498                 if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
 499                         _msc01_biu_base = (unsigned long)
 500                                         ioremap_nocache(MSC01_BIU_REG_BASE,
 501                                                 MSC01_BIU_ADDRSPACE_SZ);
 502                         gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
 503                                         MSC01_SC_CFG_GICPRES_MSK) >>
 504                                         MSC01_SC_CFG_GICPRES_SHF;
 505                 }
 506         }
 507         if (gic_present)
 508                 pr_debug("GIC present\n");
 509
 510         switch (mips_revision_sconid) {
 511         case MIPS_REVISION_SCON_SOCIT:
 512         case MIPS_REVISION_SCON_ROCIT:
 513                 if (cpu_has_veic)
 514                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 515                                         MSC01E_INT_BASE, msc_eicirqmap,
 516                                         msc_nr_eicirqs);
 517                 else
 518                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 519                                         MSC01C_INT_BASE, msc_irqmap,
 520                                         msc_nr_irqs);
 521                 break;
 522
 523         case MIPS_REVISION_SCON_SOCITSC:
 524         case MIPS_REVISION_SCON_SOCITSCP:
 525                 if (cpu_has_veic)
 526                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 527                                         MSC01E_INT_BASE, msc_eicirqmap,
 528                                         msc_nr_eicirqs);
 529                 else
 530                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 531                                         MSC01C_INT_BASE, msc_irqmap,
 532                                         msc_nr_irqs);
 533         }
 534
 535         if (cpu_has_veic) {
 536                 set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
 537                 set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
 538                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
 539                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
 540         } else if (cpu_has_vint) {
 541                 set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
 542                 set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
 543 #ifdef CONFIG_MIPS_MT_SMTC
 544                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
 545                         (0x100 << MIPSCPU_INT_I8259A));
 546                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 547                         &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
 548                 /*
 549                  * Temporary hack to ensure that the subsidiary device
 550                  * interrupts coing in via the i8259A, but associated
 551                  * with low IRQ numbers, will restore the Status.IM
 552                  * value associated with the i8259A.
 553                  */
 554                 {
 555                         int i;
 556
 557                         for (i = 0; i < 16; i++)
 558                                 irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
 559                 }
 560 #else /* Not SMTC */
 561                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 562                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 563                                                 &corehi_irqaction);
 564 #endif /* CONFIG_MIPS_MT_SMTC */
 565         } else {
 566                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 567                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 568                                                 &corehi_irqaction);
 569         }
 570
 571         if (gic_present) {
 572                 /* FIXME */
 573                 int i;
 574 #if defined(CONFIG_MIPS_MT_SMP)
 575                 gic_call_int_base = GIC_NUM_INTRS - NR_CPUS;
 576                 gic_resched_int_base = gic_call_int_base - NR_CPUS;
 577                 fill_ipi_map();
 578 #endif
 579                 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
 580                                 ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
 581                 if (!gcmp_present) {
 582                         /* Enable the GIC */
 583                         i = REG(_msc01_biu_base, MSC01_SC_CFG);
 584                         REG(_msc01_biu_base, MSC01_SC_CFG) =
 585                                 (i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
 586                         pr_debug("GIC Enabled\n");
 587                 }
 588 #if defined(CONFIG_MIPS_MT_SMP)
 589                 /* set up ipi interrupts */
 590                 if (cpu_has_vint) {
 591                         set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
 592                         set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
 593                 }
 594                 /* Argh.. this really needs sorting out.. */
 595                 printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
 596                 write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
 597                 printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
 598                 write_c0_status(0x1100dc00);
 599                 printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
 600                 for (i = 0; i < NR_CPUS; i++) {
 601                         arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
 602                                          GIC_RESCHED_INT(i), &irq_resched);
 603                         arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
 604                                          GIC_CALL_INT(i), &irq_call);
 605                 }
 606 #endif
 607         } else {
 608 #if defined(CONFIG_MIPS_MT_SMP)
 609                 /* set up ipi interrupts */
 610                 if (cpu_has_veic) {
 611                         set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
 612                         set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
 613                         cpu_ipi_resched_irq = MSC01E_INT_SW0;
 614                         cpu_ipi_call_irq = MSC01E_INT_SW1;
 615                 } else {
 616                         if (cpu_has_vint) {
 617                                 set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
 618                                 set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
 619                         }
 620                         cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
 621                         cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
 622                 }
 623                 arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
 624                 arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
 625 #endif
 626         }
 627 }
 628
 629 void malta_be_init(void)
 630 {
 631         if (gcmp_present) {
 632                 /* Could change CM error mask register */
 633         }
 634 }
 635
 636
 637 static char *tr[8] = {
 638         "mem",  "gcr",  "gic",  "mmio",
 639         "0x04", "0x05", "0x06", "0x07"
 640 };
 641
 642 static char *mcmd[32] = {
 643         [0x00] = "0x00",
 644         [0x01] = "Legacy Write",
 645         [0x02] = "Legacy Read",
 646         [0x03] = "0x03",
 647         [0x04] = "0x04",
 648         [0x05] = "0x05",
 649         [0x06] = "0x06",
 650         [0x07] = "0x07",
 651         [0x08] = "Coherent Read Own",
 652         [0x09] = "Coherent Read Share",
 653         [0x0a] = "Coherent Read Discard",
 654         [0x0b] = "Coherent Ready Share Always",
 655         [0x0c] = "Coherent Upgrade",
 656         [0x0d] = "Coherent Writeback",
 657         [0x0e] = "0x0e",
 658         [0x0f] = "0x0f",
 659         [0x10] = "Coherent Copyback",
 660         [0x11] = "Coherent Copyback Invalidate",
 661         [0x12] = "Coherent Invalidate",
 662         [0x13] = "Coherent Write Invalidate",
 663         [0x14] = "Coherent Completion Sync",
 664         [0x15] = "0x15",
 665         [0x16] = "0x16",
 666         [0x17] = "0x17",
 667         [0x18] = "0x18",
 668         [0x19] = "0x19",
 669         [0x1a] = "0x1a",
 670         [0x1b] = "0x1b",
 671         [0x1c] = "0x1c",
 672         [0x1d] = "0x1d",
 673         [0x1e] = "0x1e",
 674         [0x1f] = "0x1f"
 675 };
 676
 677 static char *core[8] = {
 678         "Invalid/OK",   "Invalid/Data",
 679         "Shared/OK",    "Shared/Data",
 680         "Modified/OK",  "Modified/Data",
 681         "Exclusive/OK", "Exclusive/Data"
 682 };
 683
 684 static char *causes[32] = {
 685         "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
 686         "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
 687         "0x08", "0x09", "0x0a", "0x0b",
 688         "0x0c", "0x0d", "0x0e", "0x0f",
 689         "0x10", "0x11", "0x12", "0x13",
 690         "0x14", "0x15", "0x16", "INTVN_WR_ERR",
 691         "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
 692         "0x1c", "0x1d", "0x1e", "0x1f"
 693 };
 694
 695 int malta_be_handler(struct pt_regs *regs, int is_fixup)
 696 {
 697         /* This duplicates the handling in do_be which seems wrong */
 698         int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
 699
 700         if (gcmp_present) {
 701                 unsigned long cm_error = GCMPGCB(GCMEC);
 702                 unsigned long cm_addr = GCMPGCB(GCMEA);
 703                 unsigned long cm_other = GCMPGCB(GCMEO);
 704                 unsigned long cause, ocause;
 705                 char buf[256];
 706
 707                 cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
 708                 if (cause != 0) {
 709                         cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
 710                         if (cause < 16) {
 711                                 unsigned long cca_bits = (cm_error >> 15) & 7;
 712                                 unsigned long tr_bits = (cm_error >> 12) & 7;
 713                                 unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
 714                                 unsigned long stag_bits = (cm_error >> 3) & 15;
 715                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 716
 717                                 snprintf(buf, sizeof(buf),
 718                                          "CCA=%lu TR=%s MCmd=%s STag=%lu "
 719                                          "SPort=%lu\n",
 720                                          cca_bits, tr[tr_bits], mcmd[mcmd_bits],
 721                                          stag_bits, sport_bits);
 722                         } else {
 723                                 /* glob state & sresp together */
 724                                 unsigned long c3_bits = (cm_error >> 18) & 7;
 725                                 unsigned long c2_bits = (cm_error >> 15) & 7;
 726                                 unsigned long c1_bits = (cm_error >> 12) & 7;
 727                                 unsigned long c0_bits = (cm_error >> 9) & 7;
 728                                 unsigned long sc_bit = (cm_error >> 8) & 1;
 729                                 unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
 730                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 731                                 snprintf(buf, sizeof(buf),
 732                                          "C3=%s C2=%s C1=%s C0=%s SC=%s "
 733                                          "MCmd=%s SPort=%lu\n",
 734                                          core[c3_bits], core[c2_bits],
 735                                          core[c1_bits], core[c0_bits],
 736                                          sc_bit ? "True" : "False",
 737                                          mcmd[mcmd_bits], sport_bits);
 738                         }
 739
 740                         ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
 741                                  GCMP_GCB_GMEO_ERROR_2ND_SHF;
 742
 743                         printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
 744                                causes[cause], buf);
 745                         printk("CM_ADDR =%08lx\n", cm_addr);
 746                         printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
 747
 748                         /* reprime cause register */
 749                         GCMPGCB(GCMEC) = 0;
 750                 }
 751         }
 752
 753         return retval;
 754 }
 755
 756 void gic_enable_interrupt(int irq_vec)
 757 {
 758         GIC_SET_INTR_MASK(irq_vec);
 759 }
 760
 761 void gic_disable_interrupt(int irq_vec)
 762 {
 763         GIC_CLR_INTR_MASK(irq_vec);
 764 }
 765
 766 void gic_irq_ack(struct irq_data *d)
 767 {
 768         int irq = (d->irq - gic_irq_base);
 769
 770         GIC_CLR_INTR_MASK(irq);
 771
 772         if (gic_irq_flags[irq] & GIC_TRIG_EDGE)
 773                 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
 774 }
 775
 776 void gic_finish_irq(struct irq_data *d)
 777 {
 778         /* Enable interrupts. */
 779         GIC_SET_INTR_MASK(d->irq - gic_irq_base);
 780 }
 781
 782 void __init gic_platform_init(int irqs, struct irq_chip *irq_controller)
 783 {
 784         int i;
 785
 786         for (i = gic_irq_base; i < (gic_irq_base + irqs); i++)
 787                 irq_set_chip(i, irq_controller);
 788 }