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/slab.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_SPINLOCK(mips_irq_lock);
  55
  56 static inline int mips_pcibios_iack(void)
  57 {
  58         int irq;
  59         u32 dummy;
  60
  61         /*
  62          * Determine highest priority pending interrupt by performing
  63          * a PCI Interrupt Acknowledge cycle.
  64          */
  65         switch (mips_revision_sconid) {
  66         case MIPS_REVISION_SCON_SOCIT:
  67         case MIPS_REVISION_SCON_ROCIT:
  68         case MIPS_REVISION_SCON_SOCITSC:
  69         case MIPS_REVISION_SCON_SOCITSCP:
  70                 MSC_READ(MSC01_PCI_IACK, irq);
  71                 irq &= 0xff;
  72                 break;
  73         case MIPS_REVISION_SCON_GT64120:
  74                 irq = GT_READ(GT_PCI0_IACK_OFS);
  75                 irq &= 0xff;
  76                 break;
  77         case MIPS_REVISION_SCON_BONITO:
  78                 /* The following will generate a PCI IACK cycle on the
  79                  * Bonito controller. It's a little bit kludgy, but it
  80                  * was the easiest way to implement it in hardware at
  81                  * the given time.
  82                  */
  83                 BONITO_PCIMAP_CFG = 0x20000;
  84
  85                 /* Flush Bonito register block */
  86                 dummy = BONITO_PCIMAP_CFG;
  87                 iob();    /* sync */
  88
  89                 irq = readl((u32 *)_pcictrl_bonito_pcicfg);
  90                 iob();    /* sync */
  91                 irq &= 0xff;
  92                 BONITO_PCIMAP_CFG = 0;
  93                 break;
  94         default:
  95                 printk(KERN_WARNING "Unknown system controller.\n");
  96                 return -1;
  97         }
  98         return irq;
  99 }
 100
 101 static inline int get_int(void)
 102 {
 103         unsigned long flags;
 104         int irq;
 105         spin_lock_irqsave(&mips_irq_lock, flags);
 106
 107         irq = mips_pcibios_iack();
 108
 109         /*
 110          * The only way we can decide if an interrupt is spurious
 111          * is by checking the 8259 registers.  This needs a spinlock
 112          * on an SMP system,  so leave it up to the generic code...
 113          */
 114
 115         spin_unlock_irqrestore(&mips_irq_lock, flags);
 116
 117         return irq;
 118 }
 119
 120 static void malta_hw0_irqdispatch(void)
 121 {
 122         int irq;
 123
 124         irq = get_int();
 125         if (irq < 0) {
 126                 /* interrupt has already been cleared */
 127                 return;
 128         }
 129
 130         do_IRQ(MALTA_INT_BASE + irq);
 131 }
 132
 133 static void malta_ipi_irqdispatch(void)
 134 {
 135         int irq;
 136
 137         irq = gic_get_int();
 138         if (irq < 0)
 139                 return;  /* interrupt has already been cleared */
 140
 141         do_IRQ(MIPS_GIC_IRQ_BASE + irq);
 142 }
 143
 144 static void corehi_irqdispatch(void)
 145 {
 146         unsigned int intedge, intsteer, pcicmd, pcibadaddr;
 147         unsigned int pcimstat, intisr, inten, intpol;
 148         unsigned int intrcause, datalo, datahi;
 149         struct pt_regs *regs = get_irq_regs();
 150
 151         printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
 152         printk(KERN_EMERG "epc   : %08lx\nStatus: %08lx\n"
 153                         "Cause : %08lx\nbadVaddr : %08lx\n",
 154                         regs->cp0_epc, regs->cp0_status,
 155                         regs->cp0_cause, regs->cp0_badvaddr);
 156
 157         /* Read all the registers and then print them as there is a
 158            problem with interspersed printk's upsetting the Bonito controller.
 159            Do it for the others too.
 160         */
 161
 162         switch (mips_revision_sconid) {
 163         case MIPS_REVISION_SCON_SOCIT:
 164         case MIPS_REVISION_SCON_ROCIT:
 165         case MIPS_REVISION_SCON_SOCITSC:
 166         case MIPS_REVISION_SCON_SOCITSCP:
 167                 ll_msc_irq();
 168                 break;
 169         case MIPS_REVISION_SCON_GT64120:
 170                 intrcause = GT_READ(GT_INTRCAUSE_OFS);
 171                 datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
 172                 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
 173                 printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
 174                 printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
 175                                 datahi, datalo);
 176                 break;
 177         case MIPS_REVISION_SCON_BONITO:
 178                 pcibadaddr = BONITO_PCIBADADDR;
 179                 pcimstat = BONITO_PCIMSTAT;
 180                 intisr = BONITO_INTISR;
 181                 inten = BONITO_INTEN;
 182                 intpol = BONITO_INTPOL;
 183                 intedge = BONITO_INTEDGE;
 184                 intsteer = BONITO_INTSTEER;
 185                 pcicmd = BONITO_PCICMD;
 186                 printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
 187                 printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
 188                 printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
 189                 printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
 190                 printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
 191                 printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
 192                 printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
 193                 printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
 194                 break;
 195         }
 196
 197         die("CoreHi interrupt", regs);
 198 }
 199
 200 static inline int clz(unsigned long x)
 201 {
 202         __asm__(
 203         "       .set    push                                    \n"
 204         "       .set    mips32                                  \n"
 205         "       clz     %0, %1                                  \n"
 206         "       .set    pop                                     \n"
 207         : "=r" (x)
 208         : "r" (x));
 209
 210         return x;
 211 }
 212
 213 /*
 214  * Version of ffs that only looks at bits 12..15.
 215  */
 216 static inline unsigned int irq_ffs(unsigned int pending)
 217 {
 218 #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
 219         return -clz(pending) + 31 - CAUSEB_IP;
 220 #else
 221         unsigned int a0 = 7;
 222         unsigned int t0;
 223
 224         t0 = pending & 0xf000;
 225         t0 = t0 < 1;
 226         t0 = t0 << 2;
 227         a0 = a0 - t0;
 228         pending = pending << t0;
 229
 230         t0 = pending & 0xc000;
 231         t0 = t0 < 1;
 232         t0 = t0 << 1;
 233         a0 = a0 - t0;
 234         pending = pending << t0;
 235
 236         t0 = pending & 0x8000;
 237         t0 = t0 < 1;
 238         /* t0 = t0 << 2; */
 239         a0 = a0 - t0;
 240         /* pending = pending << t0; */
 241
 242         return a0;
 243 #endif
 244 }
 245
 246 /*
 247  * IRQs on the Malta board look basically (barring software IRQs which we
 248  * don't use at all and all external interrupt sources are combined together
 249  * on hardware interrupt 0 (MIPS IRQ 2)) like:
 250  *
 251  *      MIPS IRQ        Source
 252  *      --------        ------
 253  *             0        Software (ignored)
 254  *             1        Software (ignored)
 255  *             2        Combined hardware interrupt (hw0)
 256  *             3        Hardware (ignored)
 257  *             4        Hardware (ignored)
 258  *             5        Hardware (ignored)
 259  *             6        Hardware (ignored)
 260  *             7        R4k timer (what we use)
 261  *
 262  * We handle the IRQ according to _our_ priority which is:
 263  *
 264  * Highest ----     R4k Timer
 265  * Lowest  ----     Combined hardware interrupt
 266  *
 267  * then we just return, if multiple IRQs are pending then we will just take
 268  * another exception, big deal.
 269  */
 270
 271 asmlinkage void plat_irq_dispatch(void)
 272 {
 273         unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
 274         int irq;
 275
 276         irq = irq_ffs(pending);
 277
 278         if (irq == MIPSCPU_INT_I8259A)
 279                 malta_hw0_irqdispatch();
 280         else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
 281                 malta_ipi_irqdispatch();
 282         else if (irq >= 0)
 283                 do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 284         else
 285                 spurious_interrupt();
 286 }
 287
 288 #ifdef CONFIG_MIPS_MT_SMP
 289
 290
 291 #define GIC_MIPS_CPU_IPI_RESCHED_IRQ    3
 292 #define GIC_MIPS_CPU_IPI_CALL_IRQ       4
 293
 294 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
 295 #define C_RESCHED C_SW0
 296 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for resched */
 297 #define C_CALL C_SW1
 298 static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
 299
 300 static void ipi_resched_dispatch(void)
 301 {
 302         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
 303 }
 304
 305 static void ipi_call_dispatch(void)
 306 {
 307         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
 308 }
 309
 310 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
 311 {
 312         return IRQ_HANDLED;
 313 }
 314
 315 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
 316 {
 317         smp_call_function_interrupt();
 318
 319         return IRQ_HANDLED;
 320 }
 321
 322 static struct irqaction irq_resched = {
 323         .handler        = ipi_resched_interrupt,
 324         .flags          = IRQF_DISABLED|IRQF_PERCPU,
 325         .name           = "IPI_resched"
 326 };
 327
 328 static struct irqaction irq_call = {
 329         .handler        = ipi_call_interrupt,
 330         .flags          = IRQF_DISABLED|IRQF_PERCPU,
 331         .name           = "IPI_call"
 332 };
 333 #endif /* CONFIG_MIPS_MT_SMP */
 334
 335 static struct irqaction i8259irq = {
 336         .handler = no_action,
 337         .name = "XT-PIC cascade"
 338 };
 339
 340 static struct irqaction corehi_irqaction = {
 341         .handler = no_action,
 342         .name = "CoreHi"
 343 };
 344
 345 static msc_irqmap_t __initdata msc_irqmap[] = {
 346         {MSC01C_INT_TMR,                MSC01_IRQ_EDGE, 0},
 347         {MSC01C_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 348 };
 349 static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
 350
 351 static msc_irqmap_t __initdata msc_eicirqmap[] = {
 352         {MSC01E_INT_SW0,                MSC01_IRQ_LEVEL, 0},
 353         {MSC01E_INT_SW1,                MSC01_IRQ_LEVEL, 0},
 354         {MSC01E_INT_I8259A,             MSC01_IRQ_LEVEL, 0},
 355         {MSC01E_INT_SMI,                MSC01_IRQ_LEVEL, 0},
 356         {MSC01E_INT_COREHI,             MSC01_IRQ_LEVEL, 0},
 357         {MSC01E_INT_CORELO,             MSC01_IRQ_LEVEL, 0},
 358         {MSC01E_INT_TMR,                MSC01_IRQ_EDGE, 0},
 359         {MSC01E_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 360         {MSC01E_INT_PERFCTR,            MSC01_IRQ_LEVEL, 0},
 361         {MSC01E_INT_CPUCTR,             MSC01_IRQ_LEVEL, 0}
 362 };
 363
 364 static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
 365
 366 #if defined(CONFIG_MIPS_MT_SMP)
 367 /*
 368  * This GIC specific tabular array defines the association between External
 369  * Interrupts and CPUs/Core Interrupts. The nature of the External
 370  * Interrupts is also defined here - polarity/trigger.
 371  */
 372 static struct gic_intr_map gic_intr_map[] = {
 373         { GIC_EXT_INTR(0),      X,      X,              X,              X,              0 },
 374         { GIC_EXT_INTR(1),      X,      X,              X,              X,              0 },
 375         { GIC_EXT_INTR(2),      X,      X,              X,              X,              0 },
 376         { GIC_EXT_INTR(3),      0,      GIC_CPU_INT0,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 377         { GIC_EXT_INTR(4),      0,      GIC_CPU_INT1,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 378         { GIC_EXT_INTR(5),      0,      GIC_CPU_INT2,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 379         { GIC_EXT_INTR(6),      0,      GIC_CPU_INT3,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 380         { GIC_EXT_INTR(7),      0,      GIC_CPU_INT4,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 381         { GIC_EXT_INTR(8),      0,      GIC_CPU_INT3,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 382         { GIC_EXT_INTR(9),      0,      GIC_CPU_INT3,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 383         { GIC_EXT_INTR(10),     X,      X,              X,              X,              0 },
 384         { GIC_EXT_INTR(11),     X,      X,              X,              X,              0 },
 385         { GIC_EXT_INTR(12),     0,      GIC_CPU_INT3,   GIC_POL_POS,    GIC_TRIG_LEVEL, 0 },
 386         { GIC_EXT_INTR(13),     0,      GIC_MAP_TO_NMI_MSK,     GIC_POL_POS, GIC_TRIG_LEVEL,    0 },
 387         { GIC_EXT_INTR(14),     0,      GIC_MAP_TO_NMI_MSK,     GIC_POL_POS, GIC_TRIG_LEVEL,    0 },
 388         { GIC_EXT_INTR(15),     X,      X,              X,              X,              0 },
 389         { GIC_EXT_INTR(16),     0,      GIC_CPU_INT1,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 390         { GIC_EXT_INTR(17),     0,      GIC_CPU_INT2,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 391         { GIC_EXT_INTR(18),     1,      GIC_CPU_INT1,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 392         { GIC_EXT_INTR(19),     1,      GIC_CPU_INT2,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 393         { GIC_EXT_INTR(20),     2,      GIC_CPU_INT1,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 394         { GIC_EXT_INTR(21),     2,      GIC_CPU_INT2,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 395         { GIC_EXT_INTR(22),     3,      GIC_CPU_INT1,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 396         { GIC_EXT_INTR(23),     3,      GIC_CPU_INT2,   GIC_POL_POS, GIC_TRIG_EDGE,     1 },
 397 };
 398 #endif
 399
 400 /*
 401  * GCMP needs to be detected before any SMP initialisation
 402  */
 403 static int __init gcmp_probe(unsigned long addr, unsigned long size)
 404 {
 405         if (gcmp_present >= 0)
 406                 return gcmp_present;
 407
 408         _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
 409         _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
 410         gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
 411
 412         if (gcmp_present)
 413                 printk(KERN_DEBUG "GCMP present\n");
 414         return gcmp_present;
 415 }
 416
 417 #if defined(CONFIG_MIPS_MT_SMP)
 418 static void __init fill_ipi_map(void)
 419 {
 420         int i;
 421
 422         for (i = 0; i < ARRAY_SIZE(gic_intr_map); i++) {
 423                 if (gic_intr_map[i].ipiflag && (gic_intr_map[i].cpunum != X))
 424                         ipi_map[gic_intr_map[i].cpunum] |=
 425                                 (1 << (gic_intr_map[i].pin + 2));
 426         }
 427 }
 428 #endif
 429
 430 void __init arch_init_irq(void)
 431 {
 432         int gic_present, gcmp_present;
 433
 434         init_i8259_irqs();
 435
 436         if (!cpu_has_veic)
 437                 mips_cpu_irq_init();
 438
 439         gcmp_present = gcmp_probe(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
 440         if (gcmp_present)  {
 441                 GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
 442                 gic_present = 1;
 443         } else {
 444                 _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
 445                 gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
 446                 MSC01_SC_CFG_GICPRES_MSK) >> MSC01_SC_CFG_GICPRES_SHF;
 447         }
 448         if (gic_present)
 449                 printk(KERN_DEBUG "GIC present\n");
 450
 451         switch (mips_revision_sconid) {
 452         case MIPS_REVISION_SCON_SOCIT:
 453         case MIPS_REVISION_SCON_ROCIT:
 454                 if (cpu_has_veic)
 455                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 456                                         MSC01E_INT_BASE, msc_eicirqmap,
 457                                         msc_nr_eicirqs);
 458                 else
 459                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 460                                         MSC01C_INT_BASE, msc_irqmap,
 461                                         msc_nr_irqs);
 462                 break;
 463
 464         case MIPS_REVISION_SCON_SOCITSC:
 465         case MIPS_REVISION_SCON_SOCITSCP:
 466                 if (cpu_has_veic)
 467                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 468                                         MSC01E_INT_BASE, msc_eicirqmap,
 469                                         msc_nr_eicirqs);
 470                 else
 471                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 472                                         MSC01C_INT_BASE, msc_irqmap,
 473                                         msc_nr_irqs);
 474         }
 475
 476         if (cpu_has_veic) {
 477                 set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
 478                 set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
 479                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
 480                 setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
 481         } else if (cpu_has_vint) {
 482                 set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
 483                 set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
 484 #ifdef CONFIG_MIPS_MT_SMTC
 485                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
 486                         (0x100 << MIPSCPU_INT_I8259A));
 487                 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 488                         &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
 489                 /*
 490                  * Temporary hack to ensure that the subsidiary device
 491                  * interrupts coing in via the i8259A, but associated
 492                  * with low IRQ numbers, will restore the Status.IM
 493                  * value associated with the i8259A.
 494                  */
 495                 {
 496                         int i;
 497
 498                         for (i = 0; i < 16; i++)
 499                                 irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
 500                 }
 501 #else /* Not SMTC */
 502                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 503                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 504                                                 &corehi_irqaction);
 505 #endif /* CONFIG_MIPS_MT_SMTC */
 506         } else {
 507                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
 508                 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 509                                                 &corehi_irqaction);
 510         }
 511
 512 #if defined(CONFIG_MIPS_MT_SMP)
 513         if (gic_present) {
 514                 /* FIXME */
 515                 int i;
 516                 struct {
 517                         unsigned int resched;
 518                         unsigned int call;
 519                 } ipiirq[] = {
 520                         {
 521                                 .resched = GIC_IPI_EXT_INTR_RESCHED_VPE0,
 522                                 .call =  GIC_IPI_EXT_INTR_CALLFNC_VPE0},
 523                         {
 524                                 .resched = GIC_IPI_EXT_INTR_RESCHED_VPE1,
 525                                 .call =  GIC_IPI_EXT_INTR_CALLFNC_VPE1
 526                         }, {
 527                                 .resched = GIC_IPI_EXT_INTR_RESCHED_VPE2,
 528                                 .call =  GIC_IPI_EXT_INTR_CALLFNC_VPE2
 529                         }, {
 530                                 .resched = GIC_IPI_EXT_INTR_RESCHED_VPE3,
 531                                 .call =  GIC_IPI_EXT_INTR_CALLFNC_VPE3
 532                         }
 533                 };
 534                 fill_ipi_map();
 535                 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map, ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
 536                 if (!gcmp_present) {
 537                         /* Enable the GIC */
 538                         i = REG(_msc01_biu_base, MSC01_SC_CFG);
 539                         REG(_msc01_biu_base, MSC01_SC_CFG) =
 540                                 (i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
 541                         pr_debug("GIC Enabled\n");
 542                 }
 543
 544                 /* set up ipi interrupts */
 545                 if (cpu_has_vint) {
 546                         set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
 547                         set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
 548                 }
 549                 /* Argh.. this really needs sorting out.. */
 550                 printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
 551                 write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
 552                 printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
 553                 write_c0_status(0x1100dc00);
 554                 printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
 555                 for (i = 0; i < ARRAY_SIZE(ipiirq); i++) {
 556                         setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, &irq_resched);
 557                         setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].call, &irq_call);
 558
 559                         set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, handle_percpu_irq);
 560                         set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].call, handle_percpu_irq);
 561                 }
 562         } else {
 563                 /* set up ipi interrupts */
 564                 if (cpu_has_veic) {
 565                         set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
 566                         set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
 567                         cpu_ipi_resched_irq = MSC01E_INT_SW0;
 568                         cpu_ipi_call_irq = MSC01E_INT_SW1;
 569                 } else {
 570                         if (cpu_has_vint) {
 571                                 set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
 572                                 set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
 573                         }
 574                         cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
 575                         cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
 576                 }
 577
 578                 setup_irq(cpu_ipi_resched_irq, &irq_resched);
 579                 setup_irq(cpu_ipi_call_irq, &irq_call);
 580
 581                 set_irq_handler(cpu_ipi_resched_irq, handle_percpu_irq);
 582                 set_irq_handler(cpu_ipi_call_irq, handle_percpu_irq);
 583         }
 584 #endif
 585 }
 586
 587 void malta_be_init(void)
 588 {
 589         if (gcmp_present) {
 590                 /* Could change CM error mask register */
 591         }
 592 }
 593
 594
 595 static char *tr[8] = {
 596         "mem",  "gcr",  "gic",  "mmio",
 597         "0x04", "0x05", "0x06", "0x07"
 598 };
 599
 600 static char *mcmd[32] = {
 601         [0x00] = "0x00",
 602         [0x01] = "Legacy Write",
 603         [0x02] = "Legacy Read",
 604         [0x03] = "0x03",
 605         [0x04] = "0x04",
 606         [0x05] = "0x05",
 607         [0x06] = "0x06",
 608         [0x07] = "0x07",
 609         [0x08] = "Coherent Read Own",
 610         [0x09] = "Coherent Read Share",
 611         [0x0a] = "Coherent Read Discard",
 612         [0x0b] = "Coherent Ready Share Always",
 613         [0x0c] = "Coherent Upgrade",
 614         [0x0d] = "Coherent Writeback",
 615         [0x0e] = "0x0e",
 616         [0x0f] = "0x0f",
 617         [0x10] = "Coherent Copyback",
 618         [0x11] = "Coherent Copyback Invalidate",
 619         [0x12] = "Coherent Invalidate",
 620         [0x13] = "Coherent Write Invalidate",
 621         [0x14] = "Coherent Completion Sync",
 622         [0x15] = "0x15",
 623         [0x16] = "0x16",
 624         [0x17] = "0x17",
 625         [0x18] = "0x18",
 626         [0x19] = "0x19",
 627         [0x1a] = "0x1a",
 628         [0x1b] = "0x1b",
 629         [0x1c] = "0x1c",
 630         [0x1d] = "0x1d",
 631         [0x1e] = "0x1e",
 632         [0x1f] = "0x1f"
 633 };
 634
 635 static char *core[8] = {
 636         "Invalid/OK",   "Invalid/Data",
 637         "Shared/OK",    "Shared/Data",
 638         "Modified/OK",  "Modified/Data",
 639         "Exclusive/OK", "Exclusive/Data"
 640 };
 641
 642 static char *causes[32] = {
 643         "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
 644         "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
 645         "0x08", "0x09", "0x0a", "0x0b",
 646         "0x0c", "0x0d", "0x0e", "0x0f",
 647         "0x10", "0x11", "0x12", "0x13",
 648         "0x14", "0x15", "0x16", "INTVN_WR_ERR",
 649         "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
 650         "0x1c", "0x1d", "0x1e", "0x1f"
 651 };
 652
 653 int malta_be_handler(struct pt_regs *regs, int is_fixup)
 654 {
 655         /* This duplicates the handling in do_be which seems wrong */
 656         int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
 657
 658         if (gcmp_present) {
 659                 unsigned long cm_error = GCMPGCB(GCMEC);
 660                 unsigned long cm_addr = GCMPGCB(GCMEA);
 661                 unsigned long cm_other = GCMPGCB(GCMEO);
 662                 unsigned long cause, ocause;
 663                 char buf[256];
 664
 665                 cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
 666                 if (cause != 0) {
 667                         cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
 668                         if (cause < 16) {
 669                                 unsigned long cca_bits = (cm_error >> 15) & 7;
 670                                 unsigned long tr_bits = (cm_error >> 12) & 7;
 671                                 unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
 672                                 unsigned long stag_bits = (cm_error >> 3) & 15;
 673                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 674
 675                                 snprintf(buf, sizeof(buf),
 676                                          "CCA=%lu TR=%s MCmd=%s STag=%lu "
 677                                          "SPort=%lu\n",
 678                                          cca_bits, tr[tr_bits], mcmd[mcmd_bits],
 679                                          stag_bits, sport_bits);
 680                         } else {
 681                                 /* glob state & sresp together */
 682                                 unsigned long c3_bits = (cm_error >> 18) & 7;
 683                                 unsigned long c2_bits = (cm_error >> 15) & 7;
 684                                 unsigned long c1_bits = (cm_error >> 12) & 7;
 685                                 unsigned long c0_bits = (cm_error >> 9) & 7;
 686                                 unsigned long sc_bit = (cm_error >> 8) & 1;
 687                                 unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
 688                                 unsigned long sport_bits = (cm_error >> 0) & 7;
 689                                 snprintf(buf, sizeof(buf),
 690                                          "C3=%s C2=%s C1=%s C0=%s SC=%s "
 691                                          "MCmd=%s SPort=%lu\n",
 692                                          core[c3_bits], core[c2_bits],
 693                                          core[c1_bits], core[c0_bits],
 694                                          sc_bit ? "True" : "False",
 695                                          mcmd[mcmd_bits], sport_bits);
 696                         }
 697
 698                         ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
 699                                  GCMP_GCB_GMEO_ERROR_2ND_SHF;
 700
 701                         printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
 702                                causes[cause], buf);
 703                         printk("CM_ADDR =%08lx\n", cm_addr);
 704                         printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
 705
 706                         /* reprime cause register */
 707                         GCMPGCB(GCMEC) = 0;
 708                 }
 709         }
 710
 711         return retval;
 712 }