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
  48 int gcmp_present = -1;
  49 int gic_present;
  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         irq = gic_get_int();
 137         if (irq < 0)
 138                 return;  /* interrupt has already been cleared */
 139
 140         do_IRQ(MIPS_GIC_IRQ_BASE + irq);
 141 }
 142
 143 static void corehi_irqdispatch(void)
 144 {
 145         unsigned int intedge, intsteer, pcicmd, pcibadaddr;
 146         unsigned int pcimstat, intisr, inten, intpol;
 147         unsigned int intrcause, datalo, datahi;
 148         struct pt_regs *regs = get_irq_regs();
 149
 150         printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
 151         printk(KERN_EMERG "epc   : %08lx\nStatus: %08lx\n"
 152                         "Cause : %08lx\nbadVaddr : %08lx\n",
 153                         regs->cp0_epc, regs->cp0_status,
 154                         regs->cp0_cause, regs->cp0_badvaddr);
 155
 156         /* Read all the registers and then print them as there is a
 157            problem with interspersed printk's upsetting the Bonito controller.
 158            Do it for the others too.
 159         */
 160
 161         switch (mips_revision_sconid) {
 162         case MIPS_REVISION_SCON_SOCIT:
 163         case MIPS_REVISION_SCON_ROCIT:
 164         case MIPS_REVISION_SCON_SOCITSC:
 165         case MIPS_REVISION_SCON_SOCITSCP:
 166                 ll_msc_irq();
 167                 break;
 168         case MIPS_REVISION_SCON_GT64120:
 169                 intrcause = GT_READ(GT_INTRCAUSE_OFS);
 170                 datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
 171                 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
 172                 printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
 173                 printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
 174                                 datahi, datalo);
 175                 break;
 176         case MIPS_REVISION_SCON_BONITO:
 177                 pcibadaddr = BONITO_PCIBADADDR;
 178                 pcimstat = BONITO_PCIMSTAT;
 179                 intisr = BONITO_INTISR;
 180                 inten = BONITO_INTEN;
 181                 intpol = BONITO_INTPOL;
 182                 intedge = BONITO_INTEDGE;
 183                 intsteer = BONITO_INTSTEER;
 184                 pcicmd = BONITO_PCICMD;
 185                 printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
 186                 printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
 187                 printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
 188                 printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
 189                 printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
 190                 printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
 191                 printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
 192                 printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
 193                 break;
 194         }
 195
 196         die("CoreHi interrupt", regs);
 197 }
 198
 199 static inline int clz(unsigned long x)
 200 {
 201         __asm__(
 202         "       .set    push                                    \n"
 203         "       .set    mips32                                  \n"
 204         "       clz     %0, %1                                  \n"
 205         "       .set    pop                                     \n"
 206         : "=r" (x)
 207         : "r" (x));
 208
 209         return x;
 210 }
 211
 212 /*
 213  * Version of ffs that only looks at bits 12..15.
 214  */
 215 static inline unsigned int irq_ffs(unsigned int pending)
 216 {
 217 #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
 218         return -clz(pending) + 31 - CAUSEB_IP;
 219 #else
 220         unsigned int a0 = 7;
 221         unsigned int t0;
 222
 223         t0 = pending & 0xf000;
 224         t0 = t0 < 1;
 225         t0 = t0 << 2;
 226         a0 = a0 - t0;
 227         pending = pending << t0;
 228
 229         t0 = pending & 0xc000;
 230         t0 = t0 < 1;
 231         t0 = t0 << 1;
 232         a0 = a0 - t0;
 233         pending = pending << t0;
 234
 235         t0 = pending & 0x8000;
 236         t0 = t0 < 1;
 237         /* t0 = t0 << 2; */
 238         a0 = a0 - t0;
 239         /* pending = pending << t0; */
 240
 241         return a0;
 242 #endif
 243 }
 244
 245 /*
 246  * IRQs on the Malta board look basically (barring software IRQs which we
 247  * don't use at all and all external interrupt sources are combined together
 248  * on hardware interrupt 0 (MIPS IRQ 2)) like:
 249  *
 250  *      MIPS IRQ        Source
 251  *      --------        ------
 252  *             0        Software (ignored)
 253  *             1        Software (ignored)
 254  *             2        Combined hardware interrupt (hw0)
 255  *             3        Hardware (ignored)
 256  *             4        Hardware (ignored)
 257  *             5        Hardware (ignored)
 258  *             6        Hardware (ignored)
 259  *             7        R4k timer (what we use)
 260  *
 261  * We handle the IRQ according to _our_ priority which is:
 262  *
 263  * Highest ----     R4k Timer
 264  * Lowest  ----     Combined hardware interrupt
 265  *
 266  * then we just return, if multiple IRQs are pending then we will just take
 267  * another exception, big deal.
 268  */
 269
 270 asmlinkage void plat_irq_dispatch(void)
 271 {
 272         unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
 273         int irq;
 274
 275         irq = irq_ffs(pending);
 276
 277         if (irq == MIPSCPU_INT_I8259A)
 278                 malta_hw0_irqdispatch();
 279         else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
 280                 malta_ipi_irqdispatch();
 281         else if (irq >= 0)
 282                 do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 283         else
 284                 spurious_interrupt();
 285 }
 286
 287 #ifdef CONFIG_MIPS_MT_SMP
 288
 289
 290 #define GIC_MIPS_CPU_IPI_RESCHED_IRQ    3
 291 #define GIC_MIPS_CPU_IPI_CALL_IRQ       4
 292
 293 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
 294 #define C_RESCHED C_SW0
 295 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for resched */
 296 #define C_CALL C_SW1
 297 static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
 298
 299 static void ipi_resched_dispatch(void)
 300 {
 301         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
 302 }
 303
 304 static void ipi_call_dispatch(void)
 305 {
 306         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
 307 }
 308
 309 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
 310 {
 311         return IRQ_HANDLED;
 312 }
 313
 314 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
 315 {
 316         smp_call_function_interrupt();
 317
 318         return IRQ_HANDLED;
 319 }
 320
 321 static struct irqaction irq_resched = {
 322         .handler        = ipi_resched_interrupt,
 323         .flags          = IRQF_DISABLED|IRQF_PERCPU,
 324         .name           = "IPI_resched"
 325 };
 326
 327 static struct irqaction irq_call = {
 328         .handler        = ipi_call_interrupt,
 329         .flags          = IRQF_DISABLED|IRQF_PERCPU,
 330         .name           = "IPI_call"
 331 };
 332 #endif /* CONFIG_MIPS_MT_SMP */
 333
 334 static int gic_resched_int_base;
 335 static int gic_call_int_base;
 336 #define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu))
 337 #define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu))
 338
 339 unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
 340 {
 341         return GIC_CALL_INT(cpu);
 342 }
 343
 344 unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
 345 {
 346         return GIC_RESCHED_INT(cpu);
 347 }
 348
 349 static struct irqaction i8259irq = {
 350         .handler = no_action,
 351         .name = "XT-PIC cascade"
 352 };
 353
 354 static struct irqaction corehi_irqaction = {
 355         .handler = no_action,
 356         .name = "CoreHi"
 357 };
 358
 359 static msc_irqmap_t __initdata msc_irqmap[] = {
 360         {MSC01C_INT_TMR,                MSC01_IRQ_EDGE, 0},
 361         {MSC01C_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 362 };
 363 static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
 364
 365 static msc_irqmap_t __initdata msc_eicirqmap[] = {
 366         {MSC01E_INT_SW0,                MSC01_IRQ_LEVEL, 0},
 367         {MSC01E_INT_SW1,                MSC01_IRQ_LEVEL, 0},
 368         {MSC01E_INT_I8259A,             MSC01_IRQ_LEVEL, 0},
 369         {MSC01E_INT_SMI,                MSC01_IRQ_LEVEL, 0},
 370         {MSC01E_INT_COREHI,             MSC01_IRQ_LEVEL, 0},
 371         {MSC01E_INT_CORELO,             MSC01_IRQ_LEVEL, 0},
 372         {MSC01E_INT_TMR,                MSC01_IRQ_EDGE, 0},
 373         {MSC01E_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 374         {MSC01E_INT_PERFCTR,            MSC01_IRQ_LEVEL, 0},
 375         {MSC01E_INT_CPUCTR,             MSC01_IRQ_LEVEL, 0}
 376 };
 377
 378 static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
 379
 380 /*
 381  * This GIC specific tabular array defines the association between External
 382  * Interrupts and CPUs/Core Interrupts. The nature of the External
 383  * Interrupts is also defined here - polarity/trigger.
 384  */
 385
 386 #define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
 387 #define X GIC_UNUSED
 388
 389 static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
 390         { X, X,            X,           X,              0 },
 391         { X, X,            X,           X,              0 },
 392         { X, X,            X,           X,              0 },
 393         { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 394         { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 395         { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 396         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 397         { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 398         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 399         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 400         { X, X,            X,           X,              0 },
 401         { X, X,            X,           X,              0 },
 402         { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 403         { 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 404         { 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
 405         { X, X,            X,           X,              0 },
 406         /* The remainder of this table is initialised by fill_ipi_map */
 407 };
 408 #undef X
 409
 410 /*
 411  * GCMP needs to be detected before any SMP initialisation
 412  */
 413 int __init gcmp_probe(unsigned long addr, unsigned long size)
 414 {
 415         if (mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) {
 416                 gcmp_present = 0;
 417                 return gcmp_present;
 418         }
 419
 420         if (gcmp_present >= 0)
 421                 return gcmp_present;
 422
 423         _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
 424         _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
 425         gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
 426
 427         if (gcmp_present)
 428                 pr_debug("GCMP present\n");
 429         return gcmp_present;
 430 }
 431
 432 /* Return the number of IOCU's present */
 433 int __init gcmp_niocu(void)
 434 {
 435   return gcmp_present ?
 436     (GCMPGCB(GC) & GCMP_GCB_GC_NUMIOCU_MSK) >> GCMP_GCB_GC_NUMIOCU_SHF :
 437     0;
 438 }
 439
 440 /* Set GCMP region attributes */
 441 void __init gcmp_setregion(int region, unsigned long base,
 442                            unsigned long mask, int type)
 443 {
 444         GCMPGCBn(CMxBASE, region) = base;
 445         GCMPGCBn(CMxMASK, region) = mask | type;
 446 }
 447
 448 #if defined(CONFIG_MIPS_MT_SMP)
 449 static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin)
 450 {
 451         int intr = baseintr + cpu;
 452         gic_intr_map[intr].cpunum = cpu;
 453         gic_intr_map[intr].pin = cpupin;
 454         gic_intr_map[intr].polarity = GIC_POL_POS;
 455         gic_intr_map[intr].trigtype = GIC_TRIG_EDGE;
 456         gic_intr_map[intr].flags = GIC_FLAG_IPI;
 457         ipi_map[cpu] |= (1 << (cpupin + 2));
 458 }
 459
 460 static void __init fill_ipi_map(void)
 461 {
 462         int cpu;
 463
 464         for (cpu = 0; cpu < NR_CPUS; cpu++) {
 465                 fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1);
 466                 fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2);
 467         }
 468 }
 469 #endif
 470
 471 void __init arch_init_ipiirq(int irq, struct irqaction *action)
 472 {
 473         setup_irq(irq, action);
 474         irq_set_handler(irq, handle_percpu_irq);
 475 }
 476
 477 void __init arch_init_irq(void)
 478 {
 479         init_i8259_irqs();
 480
 481         if (!cpu_has_veic)
 482                 mips_cpu_irq_init();
 483
 484         if (gcmp_present)  {
 485                 GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
 486                 gic_present = 1;
 487         } else {
 488                 if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
 489                         _msc01_biu_base = (unsigned long)
 490                                         ioremap_nocache(MSC01_BIU_REG_BASE,
 491                                                 MSC01_BIU_ADDRSPACE_SZ);
 492                         gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
 493                                         MSC01_SC_CFG_GICPRES_MSK) >>
 494                                         MSC01_SC_CFG_GICPRES_SHF;
 495                 }
 496         }
 497         if (gic_present)
 498                 pr_debug("GIC present\n");
 499
 500         switch (mips_revision_sconid) {
 501         case MIPS_REVISION_SCON_SOCIT:
 502         case MIPS_REVISION_SCON_ROCIT:
 503                 if (cpu_has_veic)
 504                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 505                                         MSC01E_INT_BASE, msc_eicirqmap,
 506                                         msc_nr_eicirqs);
 507                 else
 508                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 509                                         MSC01C_INT_BASE, msc_irqmap,
 510                                         msc_nr_irqs);
 511                 break;
 512
 513         case MIPS_REVISION_SCON_SOCITSC:
 514         case MIPS_REVISION_SCON_SOCITSCP:
 515                 if (cpu_has_veic)
 516                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 517                                         MSC01E_INT_BASE, msc_eicirqmap,
 518                                         msc_nr_eicirqs);
 519                 else
 520                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 521                                         MSC01C_INT_BASE, msc_irqmap,
 522                                         msc_nr_irqs);
 523         }
 524
 525         if (cpu_has_veic) {
 526                 set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
 527                 set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
 528                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
 529                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
 530         } else if (cpu_has_vint) {
 531                 set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
 532                 set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
 533 #ifdef CONFIG_MIPS_MT_SMTC
 534                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
 535                         (0x100 << MIPSCPU_INT_I8259A));
 536                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 537                         &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
 538                 /*
 539                  * Temporary hack to ensure that the subsidiary device
 540                  * interrupts coing in via the i8259A, but associated
 541                  * with low IRQ numbers, will restore the Status.IM
 542                  * value associated with the i8259A.
 543                  */
 544                 {
 545                         int i;
 546
 547                         for (i = 0; i < 16; i++)
 548                                 irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
 549                 }
 550 #else /* Not SMTC */
 551                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 552                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 553                                                 &corehi_irqaction);
 554 #endif /* CONFIG_MIPS_MT_SMTC */
 555         } else {
 556                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 557                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 558                                                 &corehi_irqaction);
 559         }
 560
 561         if (gic_present) {
 562                 /* FIXME */
 563                 int i;
 564 #if defined(CONFIG_MIPS_MT_SMP)
 565                 gic_call_int_base = GIC_NUM_INTRS - NR_CPUS;
 566                 gic_resched_int_base = gic_call_int_base - NR_CPUS;
 567                 fill_ipi_map();
 568 #endif
 569                 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
 570                                 ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
 571                 if (!gcmp_present) {
 572                         /* Enable the GIC */
 573                         i = REG(_msc01_biu_base, MSC01_SC_CFG);
 574                         REG(_msc01_biu_base, MSC01_SC_CFG) =
 575                                 (i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
 576                         pr_debug("GIC Enabled\n");
 577                 }
 578 #if defined(CONFIG_MIPS_MT_SMP)
 579                 /* set up ipi interrupts */
 580                 if (cpu_has_vint) {
 581                         set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
 582                         set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
 583                 }
 584                 /* Argh.. this really needs sorting out.. */
 585                 printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
 586                 write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
 587                 printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
 588                 write_c0_status(0x1100dc00);
 589                 printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
 590                 for (i = 0; i < NR_CPUS; i++) {
 591                         arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
 592                                          GIC_RESCHED_INT(i), &irq_resched);
 593                         arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
 594                                          GIC_CALL_INT(i), &irq_call);
 595                 }
 596 #endif
 597         } else {
 598 #if defined(CONFIG_MIPS_MT_SMP)
 599                 /* set up ipi interrupts */
 600                 if (cpu_has_veic) {
 601                         set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
 602                         set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
 603                         cpu_ipi_resched_irq = MSC01E_INT_SW0;
 604                         cpu_ipi_call_irq = MSC01E_INT_SW1;
 605                 } else {
 606                         if (cpu_has_vint) {
 607                                 set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
 608                                 set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
 609                         }
 610                         cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
 611                         cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
 612                 }
 613                 arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
 614                 arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
 615 #endif
 616         }
 617 }
 618
 619 void malta_be_init(void)
 620 {
 621         if (gcmp_present) {
 622                 /* Could change CM error mask register */
 623         }
 624 }
 625
 626
 627 static char *tr[8] = {
 628         "mem",  "gcr",  "gic",  "mmio",
 629         "0x04", "0x05", "0x06", "0x07"
 630 };
 631
 632 static char *mcmd[32] = {
 633         [0x00] = "0x00",
 634         [0x01] = "Legacy Write",
 635         [0x02] = "Legacy Read",
 636         [0x03] = "0x03",
 637         [0x04] = "0x04",
 638         [0x05] = "0x05",
 639         [0x06] = "0x06",
 640         [0x07] = "0x07",
 641         [0x08] = "Coherent Read Own",
 642         [0x09] = "Coherent Read Share",
 643         [0x0a] = "Coherent Read Discard",
 644         [0x0b] = "Coherent Ready Share Always",
 645         [0x0c] = "Coherent Upgrade",
 646         [0x0d] = "Coherent Writeback",
 647         [0x0e] = "0x0e",
 648         [0x0f] = "0x0f",
 649         [0x10] = "Coherent Copyback",
 650         [0x11] = "Coherent Copyback Invalidate",
 651         [0x12] = "Coherent Invalidate",
 652         [0x13] = "Coherent Write Invalidate",
 653         [0x14] = "Coherent Completion Sync",
 654         [0x15] = "0x15",
 655         [0x16] = "0x16",
 656         [0x17] = "0x17",
 657         [0x18] = "0x18",
 658         [0x19] = "0x19",
 659         [0x1a] = "0x1a",
 660         [0x1b] = "0x1b",
 661         [0x1c] = "0x1c",
 662         [0x1d] = "0x1d",
 663         [0x1e] = "0x1e",
 664         [0x1f] = "0x1f"
 665 };
 666
 667 static char *core[8] = {
 668         "Invalid/OK",   "Invalid/Data",
 669         "Shared/OK",    "Shared/Data",
 670         "Modified/OK",  "Modified/Data",
 671         "Exclusive/OK", "Exclusive/Data"
 672 };
 673
 674 static char *causes[32] = {
 675         "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
 676         "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
 677         "0x08", "0x09", "0x0a", "0x0b",
 678         "0x0c", "0x0d", "0x0e", "0x0f",
 679         "0x10", "0x11", "0x12", "0x13",
 680         "0x14", "0x15", "0x16", "INTVN_WR_ERR",
 681         "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
 682         "0x1c", "0x1d", "0x1e", "0x1f"
 683 };
 684
 685 int malta_be_handler(struct pt_regs *regs, int is_fixup)
 686 {
 687         /* This duplicates the handling in do_be which seems wrong */
 688         int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
 689
 690         if (gcmp_present) {
 691                 unsigned long cm_error = GCMPGCB(GCMEC);
 692                 unsigned long cm_addr = GCMPGCB(GCMEA);
 693                 unsigned long cm_other = GCMPGCB(GCMEO);
 694                 unsigned long cause, ocause;
 695                 char buf[256];
 696
 697                 cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
 698                 if (cause != 0) {
 699                         cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
 700                         if (cause < 16) {
 701                                 unsigned long cca_bits = (cm_error >> 15) & 7;
 702                                 unsigned long tr_bits = (cm_error >> 12) & 7;
 703                                 unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
 704                                 unsigned long stag_bits = (cm_error >> 3) & 15;
 705                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 706
 707                                 snprintf(buf, sizeof(buf),
 708                                          "CCA=%lu TR=%s MCmd=%s STag=%lu "
 709                                          "SPort=%lu\n",
 710                                          cca_bits, tr[tr_bits], mcmd[mcmd_bits],
 711                                          stag_bits, sport_bits);
 712                         } else {
 713                                 /* glob state & sresp together */
 714                                 unsigned long c3_bits = (cm_error >> 18) & 7;
 715                                 unsigned long c2_bits = (cm_error >> 15) & 7;
 716                                 unsigned long c1_bits = (cm_error >> 12) & 7;
 717                                 unsigned long c0_bits = (cm_error >> 9) & 7;
 718                                 unsigned long sc_bit = (cm_error >> 8) & 1;
 719                                 unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
 720                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 721                                 snprintf(buf, sizeof(buf),
 722                                          "C3=%s C2=%s C1=%s C0=%s SC=%s "
 723                                          "MCmd=%s SPort=%lu\n",
 724                                          core[c3_bits], core[c2_bits],
 725                                          core[c1_bits], core[c0_bits],
 726                                          sc_bit ? "True" : "False",
 727                                          mcmd[mcmd_bits], sport_bits);
 728                         }
 729
 730                         ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
 731                                  GCMP_GCB_GMEO_ERROR_2ND_SHF;
 732
 733                         printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
 734                                causes[cause], buf);
 735                         printk("CM_ADDR =%08lx\n", cm_addr);
 736                         printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
 737
 738                         /* reprime cause register */
 739                         GCMPGCB(GCMEC) = 0;
 740                 }
 741         }
 742
 743         return retval;
 744 }