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 int gic_present; 51 static unsigned long _msc01_biu_base; 52 static unsigned long _gcmp_base; 53 static unsigned int ipi_map[NR_CPUS]; 54 55 static DEFINE_RAW_SPINLOCK(mips_irq_lock); 56 57 static inline int mips_pcibios_iack(void) 58 { 59 int irq; 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 (void) BONITO_PCIMAP_CFG; 87 iob(); /* sync */ 88 89 irq = __raw_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 raw_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 raw_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 if (unlikely(!pending)) { 277 spurious_interrupt(); 278 return; 279 } 280 281 irq = irq_ffs(pending); 282 283 if (irq == MIPSCPU_INT_I8259A) 284 malta_hw0_irqdispatch(); 285 else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()])) 286 malta_ipi_irqdispatch(); 287 else 288 do_IRQ(MIPS_CPU_IRQ_BASE + irq); 289 } 290 291 #ifdef CONFIG_MIPS_MT_SMP 292 293 294 #define GIC_MIPS_CPU_IPI_RESCHED_IRQ 3 295 #define GIC_MIPS_CPU_IPI_CALL_IRQ 4 296 297 #define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */ 298 #define C_RESCHED C_SW0 299 #define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for resched */ 300 #define C_CALL C_SW1 301 static int cpu_ipi_resched_irq, cpu_ipi_call_irq; 302 303 static void ipi_resched_dispatch(void) 304 { 305 do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ); 306 } 307 308 static void ipi_call_dispatch(void) 309 { 310 do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ); 311 } 312 313 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) 314 { 315 scheduler_ipi(); 316 317 return IRQ_HANDLED; 318 } 319 320 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) 321 { 322 smp_call_function_interrupt(); 323 324 return IRQ_HANDLED; 325 } 326 327 static struct irqaction irq_resched = { 328 .handler = ipi_resched_interrupt, 329 .flags = IRQF_PERCPU, 330 .name = "IPI_resched" 331 }; 332 333 static struct irqaction irq_call = { 334 .handler = ipi_call_interrupt, 335 .flags = IRQF_PERCPU, 336 .name = "IPI_call" 337 }; 338 #endif /* CONFIG_MIPS_MT_SMP */ 339 340 static int gic_resched_int_base; 341 static int gic_call_int_base; 342 #define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu)) 343 #define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu)) 344 345 unsigned int plat_ipi_call_int_xlate(unsigned int cpu) 346 { 347 return GIC_CALL_INT(cpu); 348 } 349 350 unsigned int plat_ipi_resched_int_xlate(unsigned int cpu) 351 { 352 return GIC_RESCHED_INT(cpu); 353 } 354 355 static struct irqaction i8259irq = { 356 .handler = no_action, 357 .name = "XT-PIC cascade", 358 .flags = IRQF_NO_THREAD, 359 }; 360 361 static struct irqaction corehi_irqaction = { 362 .handler = no_action, 363 .name = "CoreHi", 364 .flags = IRQF_NO_THREAD, 365 }; 366 367 static msc_irqmap_t __initdata msc_irqmap[] = { 368 {MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0}, 369 {MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0}, 370 }; 371 static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap); 372 373 static msc_irqmap_t __initdata msc_eicirqmap[] = { 374 {MSC01E_INT_SW0, MSC01_IRQ_LEVEL, 0}, 375 {MSC01E_INT_SW1, MSC01_IRQ_LEVEL, 0}, 376 {MSC01E_INT_I8259A, MSC01_IRQ_LEVEL, 0}, 377 {MSC01E_INT_SMI, MSC01_IRQ_LEVEL, 0}, 378 {MSC01E_INT_COREHI, MSC01_IRQ_LEVEL, 0}, 379 {MSC01E_INT_CORELO, MSC01_IRQ_LEVEL, 0}, 380 {MSC01E_INT_TMR, MSC01_IRQ_EDGE, 0}, 381 {MSC01E_INT_PCI, MSC01_IRQ_LEVEL, 0}, 382 {MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0}, 383 {MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0} 384 }; 385 386 static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap); 387 388 /* 389 * This GIC specific tabular array defines the association between External 390 * Interrupts and CPUs/Core Interrupts. The nature of the External 391 * Interrupts is also defined here - polarity/trigger. 392 */ 393 394 #define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK 395 #define X GIC_UNUSED 396 397 static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = { 398 { X, X, X, X, 0 }, 399 { X, X, X, X, 0 }, 400 { X, X, X, X, 0 }, 401 { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 402 { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 403 { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 404 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 405 { 0, GIC_CPU_INT4, 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_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 408 { X, X, X, X, 0 }, 409 { X, X, X, X, 0 }, 410 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 411 { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 412 { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT }, 413 { X, X, X, X, 0 }, 414 /* The remainder of this table is initialised by fill_ipi_map */ 415 }; 416 #undef X 417 418 /* 419 * GCMP needs to be detected before any SMP initialisation 420 */ 421 int __init gcmp_probe(unsigned long addr, unsigned long size) 422 { 423 if (mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) { 424 gcmp_present = 0; 425 return gcmp_present; 426 } 427 428 if (gcmp_present >= 0) 429 return gcmp_present; 430 431 _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ); 432 _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ); 433 gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR; 434 435 if (gcmp_present) 436 pr_debug("GCMP present\n"); 437 return gcmp_present; 438 } 439 440 /* Return the number of IOCU's present */ 441 int __init gcmp_niocu(void) 442 { 443 return gcmp_present ? 444 (GCMPGCB(GC) & GCMP_GCB_GC_NUMIOCU_MSK) >> GCMP_GCB_GC_NUMIOCU_SHF : 445 0; 446 } 447 448 /* Set GCMP region attributes */ 449 void __init gcmp_setregion(int region, unsigned long base, 450 unsigned long mask, int type) 451 { 452 GCMPGCBn(CMxBASE, region) = base; 453 GCMPGCBn(CMxMASK, region) = mask | type; 454 } 455 456 #if defined(CONFIG_MIPS_MT_SMP) 457 static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin) 458 { 459 int intr = baseintr + cpu; 460 gic_intr_map[intr].cpunum = cpu; 461 gic_intr_map[intr].pin = cpupin; 462 gic_intr_map[intr].polarity = GIC_POL_POS; 463 gic_intr_map[intr].trigtype = GIC_TRIG_EDGE; 464 gic_intr_map[intr].flags = GIC_FLAG_IPI; 465 ipi_map[cpu] |= (1 << (cpupin + 2)); 466 } 467 468 static void __init fill_ipi_map(void) 469 { 470 int cpu; 471 472 for (cpu = 0; cpu < NR_CPUS; cpu++) { 473 fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1); 474 fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2); 475 } 476 } 477 #endif 478 479 void __init arch_init_ipiirq(int irq, struct irqaction *action) 480 { 481 setup_irq(irq, action); 482 irq_set_handler(irq, handle_percpu_irq); 483 } 484 485 void __init arch_init_irq(void) 486 { 487 init_i8259_irqs(); 488 489 if (!cpu_has_veic) 490 mips_cpu_irq_init(); 491 492 if (gcmp_present) { 493 GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK; 494 gic_present = 1; 495 } else { 496 if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) { 497 _msc01_biu_base = (unsigned long) 498 ioremap_nocache(MSC01_BIU_REG_BASE, 499 MSC01_BIU_ADDRSPACE_SZ); 500 gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) & 501 MSC01_SC_CFG_GICPRES_MSK) >> 502 MSC01_SC_CFG_GICPRES_SHF; 503 } 504 } 505 if (gic_present) 506 pr_debug("GIC present\n"); 507 508 switch (mips_revision_sconid) { 509 case MIPS_REVISION_SCON_SOCIT: 510 case MIPS_REVISION_SCON_ROCIT: 511 if (cpu_has_veic) 512 init_msc_irqs(MIPS_MSC01_IC_REG_BASE, 513 MSC01E_INT_BASE, msc_eicirqmap, 514 msc_nr_eicirqs); 515 else 516 init_msc_irqs(MIPS_MSC01_IC_REG_BASE, 517 MSC01C_INT_BASE, msc_irqmap, 518 msc_nr_irqs); 519 break; 520 521 case MIPS_REVISION_SCON_SOCITSC: 522 case MIPS_REVISION_SCON_SOCITSCP: 523 if (cpu_has_veic) 524 init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE, 525 MSC01E_INT_BASE, msc_eicirqmap, 526 msc_nr_eicirqs); 527 else 528 init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE, 529 MSC01C_INT_BASE, msc_irqmap, 530 msc_nr_irqs); 531 } 532 533 if (cpu_has_veic) { 534 set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch); 535 set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch); 536 setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq); 537 setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction); 538 } else if (cpu_has_vint) { 539 set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch); 540 set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch); 541 #ifdef CONFIG_MIPS_MT_SMTC 542 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq, 543 (0x100 << MIPSCPU_INT_I8259A)); 544 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI, 545 &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI)); 546 /* 547 * Temporary hack to ensure that the subsidiary device 548 * interrupts coing in via the i8259A, but associated 549 * with low IRQ numbers, will restore the Status.IM 550 * value associated with the i8259A. 551 */ 552 { 553 int i; 554 555 for (i = 0; i < 16; i++) 556 irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A); 557 } 558 #else /* Not SMTC */ 559 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq); 560 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI, 561 &corehi_irqaction); 562 #endif /* CONFIG_MIPS_MT_SMTC */ 563 } else { 564 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq); 565 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI, 566 &corehi_irqaction); 567 } 568 569 if (gic_present) { 570 /* FIXME */ 571 int i; 572 #if defined(CONFIG_MIPS_MT_SMP) 573 gic_call_int_base = GIC_NUM_INTRS - NR_CPUS; 574 gic_resched_int_base = gic_call_int_base - NR_CPUS; 575 fill_ipi_map(); 576 #endif 577 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map, 578 ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE); 579 if (!gcmp_present) { 580 /* Enable the GIC */ 581 i = REG(_msc01_biu_base, MSC01_SC_CFG); 582 REG(_msc01_biu_base, MSC01_SC_CFG) = 583 (i | (0x1 << MSC01_SC_CFG_GICENA_SHF)); 584 pr_debug("GIC Enabled\n"); 585 } 586 #if defined(CONFIG_MIPS_MT_SMP) 587 /* set up ipi interrupts */ 588 if (cpu_has_vint) { 589 set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch); 590 set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch); 591 } 592 /* Argh.. this really needs sorting out.. */ 593 printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status()); 594 write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4); 595 printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status()); 596 write_c0_status(0x1100dc00); 597 printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status()); 598 for (i = 0; i < NR_CPUS; i++) { 599 arch_init_ipiirq(MIPS_GIC_IRQ_BASE + 600 GIC_RESCHED_INT(i), &irq_resched); 601 arch_init_ipiirq(MIPS_GIC_IRQ_BASE + 602 GIC_CALL_INT(i), &irq_call); 603 } 604 #endif 605 } else { 606 #if defined(CONFIG_MIPS_MT_SMP) 607 /* set up ipi interrupts */ 608 if (cpu_has_veic) { 609 set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch); 610 set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch); 611 cpu_ipi_resched_irq = MSC01E_INT_SW0; 612 cpu_ipi_call_irq = MSC01E_INT_SW1; 613 } else { 614 if (cpu_has_vint) { 615 set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch); 616 set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch); 617 } 618 cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ; 619 cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ; 620 } 621 arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched); 622 arch_init_ipiirq(cpu_ipi_call_irq, &irq_call); 623 #endif 624 } 625 } 626 627 void malta_be_init(void) 628 { 629 if (gcmp_present) { 630 /* Could change CM error mask register */ 631 } 632 } 633 634 635 static char *tr[8] = { 636 "mem", "gcr", "gic", "mmio", 637 "0x04", "0x05", "0x06", "0x07" 638 }; 639 640 static char *mcmd[32] = { 641 [0x00] = "0x00", 642 [0x01] = "Legacy Write", 643 [0x02] = "Legacy Read", 644 [0x03] = "0x03", 645 [0x04] = "0x04", 646 [0x05] = "0x05", 647 [0x06] = "0x06", 648 [0x07] = "0x07", 649 [0x08] = "Coherent Read Own", 650 [0x09] = "Coherent Read Share", 651 [0x0a] = "Coherent Read Discard", 652 [0x0b] = "Coherent Ready Share Always", 653 [0x0c] = "Coherent Upgrade", 654 [0x0d] = "Coherent Writeback", 655 [0x0e] = "0x0e", 656 [0x0f] = "0x0f", 657 [0x10] = "Coherent Copyback", 658 [0x11] = "Coherent Copyback Invalidate", 659 [0x12] = "Coherent Invalidate", 660 [0x13] = "Coherent Write Invalidate", 661 [0x14] = "Coherent Completion Sync", 662 [0x15] = "0x15", 663 [0x16] = "0x16", 664 [0x17] = "0x17", 665 [0x18] = "0x18", 666 [0x19] = "0x19", 667 [0x1a] = "0x1a", 668 [0x1b] = "0x1b", 669 [0x1c] = "0x1c", 670 [0x1d] = "0x1d", 671 [0x1e] = "0x1e", 672 [0x1f] = "0x1f" 673 }; 674 675 static char *core[8] = { 676 "Invalid/OK", "Invalid/Data", 677 "Shared/OK", "Shared/Data", 678 "Modified/OK", "Modified/Data", 679 "Exclusive/OK", "Exclusive/Data" 680 }; 681 682 static char *causes[32] = { 683 "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR", 684 "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07", 685 "0x08", "0x09", "0x0a", "0x0b", 686 "0x0c", "0x0d", "0x0e", "0x0f", 687 "0x10", "0x11", "0x12", "0x13", 688 "0x14", "0x15", "0x16", "INTVN_WR_ERR", 689 "INTVN_RD_ERR", "0x19", "0x1a", "0x1b", 690 "0x1c", "0x1d", "0x1e", "0x1f" 691 }; 692 693 int malta_be_handler(struct pt_regs *regs, int is_fixup) 694 { 695 /* This duplicates the handling in do_be which seems wrong */ 696 int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL; 697 698 if (gcmp_present) { 699 unsigned long cm_error = GCMPGCB(GCMEC); 700 unsigned long cm_addr = GCMPGCB(GCMEA); 701 unsigned long cm_other = GCMPGCB(GCMEO); 702 unsigned long cause, ocause; 703 char buf[256]; 704 705 cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK); 706 if (cause != 0) { 707 cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF; 708 if (cause < 16) { 709 unsigned long cca_bits = (cm_error >> 15) & 7; 710 unsigned long tr_bits = (cm_error >> 12) & 7; 711 unsigned long mcmd_bits = (cm_error >> 7) & 0x1f; 712 unsigned long stag_bits = (cm_error >> 3) & 15; 713 unsigned long sport_bits = (cm_error >> 0) & 7; 714 715 snprintf(buf, sizeof(buf), 716 "CCA=%lu TR=%s MCmd=%s STag=%lu " 717 "SPort=%lu\n", 718 cca_bits, tr[tr_bits], mcmd[mcmd_bits], 719 stag_bits, sport_bits); 720 } else { 721 /* glob state & sresp together */ 722 unsigned long c3_bits = (cm_error >> 18) & 7; 723 unsigned long c2_bits = (cm_error >> 15) & 7; 724 unsigned long c1_bits = (cm_error >> 12) & 7; 725 unsigned long c0_bits = (cm_error >> 9) & 7; 726 unsigned long sc_bit = (cm_error >> 8) & 1; 727 unsigned long mcmd_bits = (cm_error >> 3) & 0x1f; 728 unsigned long sport_bits = (cm_error >> 0) & 7; 729 snprintf(buf, sizeof(buf), 730 "C3=%s C2=%s C1=%s C0=%s SC=%s " 731 "MCmd=%s SPort=%lu\n", 732 core[c3_bits], core[c2_bits], 733 core[c1_bits], core[c0_bits], 734 sc_bit ? "True" : "False", 735 mcmd[mcmd_bits], sport_bits); 736 } 737 738 ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >> 739 GCMP_GCB_GMEO_ERROR_2ND_SHF; 740 741 printk("CM_ERROR=%08lx %s <%s>\n", cm_error, 742 causes[cause], buf); 743 printk("CM_ADDR =%08lx\n", cm_addr); 744 printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]); 745 746 /* reprime cause register */ 747 GCMPGCB(GCMEC) = 0; 748 } 749 } 750 751 return retval; 752 } 753 754 void gic_enable_interrupt(int irq_vec) 755 { 756 GIC_SET_INTR_MASK(irq_vec); 757 } 758 759 void gic_disable_interrupt(int irq_vec) 760 { 761 GIC_CLR_INTR_MASK(irq_vec); 762 } 763 764 void gic_irq_ack(struct irq_data *d) 765 { 766 int irq = (d->irq - gic_irq_base); 767 768 GIC_CLR_INTR_MASK(irq); 769 770 if (gic_irq_flags[irq] & GIC_TRIG_EDGE) 771 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq); 772 } 773 774 void gic_finish_irq(struct irq_data *d) 775 { 776 /* Enable interrupts. */ 777 GIC_SET_INTR_MASK(d->irq - gic_irq_base); 778 } 779 780 void __init gic_platform_init(int irqs, struct irq_chip *irq_controller) 781 { 782 int i; 783 784 for (i = gic_irq_base; i < (gic_irq_base + irqs); i++) 785 irq_set_chip(i, irq_controller); 786 } 787