1 /* 2 * Processor capabilities determination functions. 3 * 4 * Copyright (C) xxxx the Anonymous 5 * Copyright (C) 1994 - 2006 Ralf Baechle 6 * Copyright (C) 2003, 2004 Maciej W. Rozycki 7 * Copyright (C) 2001, 2004 MIPS Inc. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/ptrace.h> 17 #include <linux/smp.h> 18 #include <linux/stddef.h> 19 #include <linux/module.h> 20 21 #include <asm/bugs.h> 22 #include <asm/cpu.h> 23 #include <asm/fpu.h> 24 #include <asm/mipsregs.h> 25 #include <asm/system.h> 26 #include <asm/watch.h> 27 #include <asm/spram.h> 28 #include <asm/uaccess.h> 29 30 /* 31 * Not all of the MIPS CPUs have the "wait" instruction available. Moreover, 32 * the implementation of the "wait" feature differs between CPU families. This 33 * points to the function that implements CPU specific wait. 34 * The wait instruction stops the pipeline and reduces the power consumption of 35 * the CPU very much. 36 */ 37 void (*cpu_wait)(void); 38 EXPORT_SYMBOL(cpu_wait); 39 40 static void r3081_wait(void) 41 { 42 unsigned long cfg = read_c0_conf(); 43 write_c0_conf(cfg | R30XX_CONF_HALT); 44 } 45 46 static void r39xx_wait(void) 47 { 48 local_irq_disable(); 49 if (!need_resched()) 50 write_c0_conf(read_c0_conf() | TX39_CONF_HALT); 51 local_irq_enable(); 52 } 53 54 extern void r4k_wait(void); 55 56 /* 57 * This variant is preferable as it allows testing need_resched and going to 58 * sleep depending on the outcome atomically. Unfortunately the "It is 59 * implementation-dependent whether the pipeline restarts when a non-enabled 60 * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes 61 * using this version a gamble. 62 */ 63 void r4k_wait_irqoff(void) 64 { 65 local_irq_disable(); 66 if (!need_resched()) 67 __asm__(" .set push \n" 68 " .set mips3 \n" 69 " wait \n" 70 " .set pop \n"); 71 local_irq_enable(); 72 __asm__(" .globl __pastwait \n" 73 "__pastwait: \n"); 74 return; 75 } 76 77 /* 78 * The RM7000 variant has to handle erratum 38. The workaround is to not 79 * have any pending stores when the WAIT instruction is executed. 80 */ 81 static void rm7k_wait_irqoff(void) 82 { 83 local_irq_disable(); 84 if (!need_resched()) 85 __asm__( 86 " .set push \n" 87 " .set mips3 \n" 88 " .set noat \n" 89 " mfc0 $1, $12 \n" 90 " sync \n" 91 " mtc0 $1, $12 # stalls until W stage \n" 92 " wait \n" 93 " mtc0 $1, $12 # stalls until W stage \n" 94 " .set pop \n"); 95 local_irq_enable(); 96 } 97 98 /* 99 * The Au1xxx wait is available only if using 32khz counter or 100 * external timer source, but specifically not CP0 Counter. 101 * alchemy/common/time.c may override cpu_wait! 102 */ 103 static void au1k_wait(void) 104 { 105 __asm__(" .set mips3 \n" 106 " cache 0x14, 0(%0) \n" 107 " cache 0x14, 32(%0) \n" 108 " sync \n" 109 " nop \n" 110 " wait \n" 111 " nop \n" 112 " nop \n" 113 " nop \n" 114 " nop \n" 115 " .set mips0 \n" 116 : : "r" (au1k_wait)); 117 } 118 119 static int __initdata nowait; 120 121 static int __init wait_disable(char *s) 122 { 123 nowait = 1; 124 125 return 1; 126 } 127 128 __setup("nowait", wait_disable); 129 130 static int __cpuinitdata mips_fpu_disabled; 131 132 static int __init fpu_disable(char *s) 133 { 134 cpu_data[0].options &= ~MIPS_CPU_FPU; 135 mips_fpu_disabled = 1; 136 137 return 1; 138 } 139 140 __setup("nofpu", fpu_disable); 141 142 int __cpuinitdata mips_dsp_disabled; 143 144 static int __init dsp_disable(char *s) 145 { 146 cpu_data[0].ases &= ~MIPS_ASE_DSP; 147 mips_dsp_disabled = 1; 148 149 return 1; 150 } 151 152 __setup("nodsp", dsp_disable); 153 154 void __init check_wait(void) 155 { 156 struct cpuinfo_mips *c = ¤t_cpu_data; 157 158 if (nowait) { 159 printk("Wait instruction disabled.\n"); 160 return; 161 } 162 163 switch (c->cputype) { 164 case CPU_R3081: 165 case CPU_R3081E: 166 cpu_wait = r3081_wait; 167 break; 168 case CPU_TX3927: 169 cpu_wait = r39xx_wait; 170 break; 171 case CPU_R4200: 172 /* case CPU_R4300: */ 173 case CPU_R4600: 174 case CPU_R4640: 175 case CPU_R4650: 176 case CPU_R4700: 177 case CPU_R5000: 178 case CPU_R5500: 179 case CPU_NEVADA: 180 case CPU_4KC: 181 case CPU_4KEC: 182 case CPU_4KSC: 183 case CPU_5KC: 184 case CPU_25KF: 185 case CPU_PR4450: 186 case CPU_BMIPS3300: 187 case CPU_BMIPS4350: 188 case CPU_BMIPS4380: 189 case CPU_BMIPS5000: 190 case CPU_CAVIUM_OCTEON: 191 case CPU_CAVIUM_OCTEON_PLUS: 192 case CPU_CAVIUM_OCTEON2: 193 case CPU_JZRISC: 194 cpu_wait = r4k_wait; 195 break; 196 197 case CPU_RM7000: 198 cpu_wait = rm7k_wait_irqoff; 199 break; 200 201 case CPU_24K: 202 case CPU_34K: 203 case CPU_1004K: 204 cpu_wait = r4k_wait; 205 if (read_c0_config7() & MIPS_CONF7_WII) 206 cpu_wait = r4k_wait_irqoff; 207 break; 208 209 case CPU_74K: 210 cpu_wait = r4k_wait; 211 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0)) 212 cpu_wait = r4k_wait_irqoff; 213 break; 214 215 case CPU_TX49XX: 216 cpu_wait = r4k_wait_irqoff; 217 break; 218 case CPU_ALCHEMY: 219 cpu_wait = au1k_wait; 220 break; 221 case CPU_20KC: 222 /* 223 * WAIT on Rev1.0 has E1, E2, E3 and E16. 224 * WAIT on Rev2.0 and Rev3.0 has E16. 225 * Rev3.1 WAIT is nop, why bother 226 */ 227 if ((c->processor_id & 0xff) <= 0x64) 228 break; 229 230 /* 231 * Another rev is incremeting c0_count at a reduced clock 232 * rate while in WAIT mode. So we basically have the choice 233 * between using the cp0 timer as clocksource or avoiding 234 * the WAIT instruction. Until more details are known, 235 * disable the use of WAIT for 20Kc entirely. 236 cpu_wait = r4k_wait; 237 */ 238 break; 239 case CPU_RM9000: 240 if ((c->processor_id & 0x00ff) >= 0x40) 241 cpu_wait = r4k_wait; 242 break; 243 default: 244 break; 245 } 246 } 247 248 static inline void check_errata(void) 249 { 250 struct cpuinfo_mips *c = ¤t_cpu_data; 251 252 switch (c->cputype) { 253 case CPU_34K: 254 /* 255 * Erratum "RPS May Cause Incorrect Instruction Execution" 256 * This code only handles VPE0, any SMP/SMTC/RTOS code 257 * making use of VPE1 will be responsable for that VPE. 258 */ 259 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2) 260 write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS); 261 break; 262 default: 263 break; 264 } 265 } 266 267 void __init check_bugs32(void) 268 { 269 check_errata(); 270 } 271 272 /* 273 * Probe whether cpu has config register by trying to play with 274 * alternate cache bit and see whether it matters. 275 * It's used by cpu_probe to distinguish between R3000A and R3081. 276 */ 277 static inline int cpu_has_confreg(void) 278 { 279 #ifdef CONFIG_CPU_R3000 280 extern unsigned long r3k_cache_size(unsigned long); 281 unsigned long size1, size2; 282 unsigned long cfg = read_c0_conf(); 283 284 size1 = r3k_cache_size(ST0_ISC); 285 write_c0_conf(cfg ^ R30XX_CONF_AC); 286 size2 = r3k_cache_size(ST0_ISC); 287 write_c0_conf(cfg); 288 return size1 != size2; 289 #else 290 return 0; 291 #endif 292 } 293 294 /* 295 * Get the FPU Implementation/Revision. 296 */ 297 static inline unsigned long cpu_get_fpu_id(void) 298 { 299 unsigned long tmp, fpu_id; 300 301 tmp = read_c0_status(); 302 __enable_fpu(); 303 fpu_id = read_32bit_cp1_register(CP1_REVISION); 304 write_c0_status(tmp); 305 return fpu_id; 306 } 307 308 /* 309 * Check the CPU has an FPU the official way. 310 */ 311 static inline int __cpu_has_fpu(void) 312 { 313 return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE); 314 } 315 316 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c) 317 { 318 #ifdef __NEED_VMBITS_PROBE 319 write_c0_entryhi(0x3fffffffffffe000ULL); 320 back_to_back_c0_hazard(); 321 c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL); 322 #endif 323 } 324 325 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \ 326 | MIPS_CPU_COUNTER) 327 328 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu) 329 { 330 switch (c->processor_id & 0xff00) { 331 case PRID_IMP_R2000: 332 c->cputype = CPU_R2000; 333 __cpu_name[cpu] = "R2000"; 334 c->isa_level = MIPS_CPU_ISA_I; 335 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | 336 MIPS_CPU_NOFPUEX; 337 if (__cpu_has_fpu()) 338 c->options |= MIPS_CPU_FPU; 339 c->tlbsize = 64; 340 break; 341 case PRID_IMP_R3000: 342 if ((c->processor_id & 0xff) == PRID_REV_R3000A) { 343 if (cpu_has_confreg()) { 344 c->cputype = CPU_R3081E; 345 __cpu_name[cpu] = "R3081"; 346 } else { 347 c->cputype = CPU_R3000A; 348 __cpu_name[cpu] = "R3000A"; 349 } 350 break; 351 } else { 352 c->cputype = CPU_R3000; 353 __cpu_name[cpu] = "R3000"; 354 } 355 c->isa_level = MIPS_CPU_ISA_I; 356 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | 357 MIPS_CPU_NOFPUEX; 358 if (__cpu_has_fpu()) 359 c->options |= MIPS_CPU_FPU; 360 c->tlbsize = 64; 361 break; 362 case PRID_IMP_R4000: 363 if (read_c0_config() & CONF_SC) { 364 if ((c->processor_id & 0xff) >= PRID_REV_R4400) { 365 c->cputype = CPU_R4400PC; 366 __cpu_name[cpu] = "R4400PC"; 367 } else { 368 c->cputype = CPU_R4000PC; 369 __cpu_name[cpu] = "R4000PC"; 370 } 371 } else { 372 if ((c->processor_id & 0xff) >= PRID_REV_R4400) { 373 c->cputype = CPU_R4400SC; 374 __cpu_name[cpu] = "R4400SC"; 375 } else { 376 c->cputype = CPU_R4000SC; 377 __cpu_name[cpu] = "R4000SC"; 378 } 379 } 380 381 c->isa_level = MIPS_CPU_ISA_III; 382 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 383 MIPS_CPU_WATCH | MIPS_CPU_VCE | 384 MIPS_CPU_LLSC; 385 c->tlbsize = 48; 386 break; 387 case PRID_IMP_VR41XX: 388 switch (c->processor_id & 0xf0) { 389 case PRID_REV_VR4111: 390 c->cputype = CPU_VR4111; 391 __cpu_name[cpu] = "NEC VR4111"; 392 break; 393 case PRID_REV_VR4121: 394 c->cputype = CPU_VR4121; 395 __cpu_name[cpu] = "NEC VR4121"; 396 break; 397 case PRID_REV_VR4122: 398 if ((c->processor_id & 0xf) < 0x3) { 399 c->cputype = CPU_VR4122; 400 __cpu_name[cpu] = "NEC VR4122"; 401 } else { 402 c->cputype = CPU_VR4181A; 403 __cpu_name[cpu] = "NEC VR4181A"; 404 } 405 break; 406 case PRID_REV_VR4130: 407 if ((c->processor_id & 0xf) < 0x4) { 408 c->cputype = CPU_VR4131; 409 __cpu_name[cpu] = "NEC VR4131"; 410 } else { 411 c->cputype = CPU_VR4133; 412 __cpu_name[cpu] = "NEC VR4133"; 413 } 414 break; 415 default: 416 printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n"); 417 c->cputype = CPU_VR41XX; 418 __cpu_name[cpu] = "NEC Vr41xx"; 419 break; 420 } 421 c->isa_level = MIPS_CPU_ISA_III; 422 c->options = R4K_OPTS; 423 c->tlbsize = 32; 424 break; 425 case PRID_IMP_R4300: 426 c->cputype = CPU_R4300; 427 __cpu_name[cpu] = "R4300"; 428 c->isa_level = MIPS_CPU_ISA_III; 429 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 430 MIPS_CPU_LLSC; 431 c->tlbsize = 32; 432 break; 433 case PRID_IMP_R4600: 434 c->cputype = CPU_R4600; 435 __cpu_name[cpu] = "R4600"; 436 c->isa_level = MIPS_CPU_ISA_III; 437 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 438 MIPS_CPU_LLSC; 439 c->tlbsize = 48; 440 break; 441 #if 0 442 case PRID_IMP_R4650: 443 /* 444 * This processor doesn't have an MMU, so it's not 445 * "real easy" to run Linux on it. It is left purely 446 * for documentation. Commented out because it shares 447 * it's c0_prid id number with the TX3900. 448 */ 449 c->cputype = CPU_R4650; 450 __cpu_name[cpu] = "R4650"; 451 c->isa_level = MIPS_CPU_ISA_III; 452 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC; 453 c->tlbsize = 48; 454 break; 455 #endif 456 case PRID_IMP_TX39: 457 c->isa_level = MIPS_CPU_ISA_I; 458 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE; 459 460 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) { 461 c->cputype = CPU_TX3927; 462 __cpu_name[cpu] = "TX3927"; 463 c->tlbsize = 64; 464 } else { 465 switch (c->processor_id & 0xff) { 466 case PRID_REV_TX3912: 467 c->cputype = CPU_TX3912; 468 __cpu_name[cpu] = "TX3912"; 469 c->tlbsize = 32; 470 break; 471 case PRID_REV_TX3922: 472 c->cputype = CPU_TX3922; 473 __cpu_name[cpu] = "TX3922"; 474 c->tlbsize = 64; 475 break; 476 } 477 } 478 break; 479 case PRID_IMP_R4700: 480 c->cputype = CPU_R4700; 481 __cpu_name[cpu] = "R4700"; 482 c->isa_level = MIPS_CPU_ISA_III; 483 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 484 MIPS_CPU_LLSC; 485 c->tlbsize = 48; 486 break; 487 case PRID_IMP_TX49: 488 c->cputype = CPU_TX49XX; 489 __cpu_name[cpu] = "R49XX"; 490 c->isa_level = MIPS_CPU_ISA_III; 491 c->options = R4K_OPTS | MIPS_CPU_LLSC; 492 if (!(c->processor_id & 0x08)) 493 c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR; 494 c->tlbsize = 48; 495 break; 496 case PRID_IMP_R5000: 497 c->cputype = CPU_R5000; 498 __cpu_name[cpu] = "R5000"; 499 c->isa_level = MIPS_CPU_ISA_IV; 500 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 501 MIPS_CPU_LLSC; 502 c->tlbsize = 48; 503 break; 504 case PRID_IMP_R5432: 505 c->cputype = CPU_R5432; 506 __cpu_name[cpu] = "R5432"; 507 c->isa_level = MIPS_CPU_ISA_IV; 508 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 509 MIPS_CPU_WATCH | MIPS_CPU_LLSC; 510 c->tlbsize = 48; 511 break; 512 case PRID_IMP_R5500: 513 c->cputype = CPU_R5500; 514 __cpu_name[cpu] = "R5500"; 515 c->isa_level = MIPS_CPU_ISA_IV; 516 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 517 MIPS_CPU_WATCH | MIPS_CPU_LLSC; 518 c->tlbsize = 48; 519 break; 520 case PRID_IMP_NEVADA: 521 c->cputype = CPU_NEVADA; 522 __cpu_name[cpu] = "Nevada"; 523 c->isa_level = MIPS_CPU_ISA_IV; 524 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 525 MIPS_CPU_DIVEC | MIPS_CPU_LLSC; 526 c->tlbsize = 48; 527 break; 528 case PRID_IMP_R6000: 529 c->cputype = CPU_R6000; 530 __cpu_name[cpu] = "R6000"; 531 c->isa_level = MIPS_CPU_ISA_II; 532 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU | 533 MIPS_CPU_LLSC; 534 c->tlbsize = 32; 535 break; 536 case PRID_IMP_R6000A: 537 c->cputype = CPU_R6000A; 538 __cpu_name[cpu] = "R6000A"; 539 c->isa_level = MIPS_CPU_ISA_II; 540 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU | 541 MIPS_CPU_LLSC; 542 c->tlbsize = 32; 543 break; 544 case PRID_IMP_RM7000: 545 c->cputype = CPU_RM7000; 546 __cpu_name[cpu] = "RM7000"; 547 c->isa_level = MIPS_CPU_ISA_IV; 548 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 549 MIPS_CPU_LLSC; 550 /* 551 * Undocumented RM7000: Bit 29 in the info register of 552 * the RM7000 v2.0 indicates if the TLB has 48 or 64 553 * entries. 554 * 555 * 29 1 => 64 entry JTLB 556 * 0 => 48 entry JTLB 557 */ 558 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; 559 break; 560 case PRID_IMP_RM9000: 561 c->cputype = CPU_RM9000; 562 __cpu_name[cpu] = "RM9000"; 563 c->isa_level = MIPS_CPU_ISA_IV; 564 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 565 MIPS_CPU_LLSC; 566 /* 567 * Bit 29 in the info register of the RM9000 568 * indicates if the TLB has 48 or 64 entries. 569 * 570 * 29 1 => 64 entry JTLB 571 * 0 => 48 entry JTLB 572 */ 573 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; 574 break; 575 case PRID_IMP_R8000: 576 c->cputype = CPU_R8000; 577 __cpu_name[cpu] = "RM8000"; 578 c->isa_level = MIPS_CPU_ISA_IV; 579 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX | 580 MIPS_CPU_FPU | MIPS_CPU_32FPR | 581 MIPS_CPU_LLSC; 582 c->tlbsize = 384; /* has weird TLB: 3-way x 128 */ 583 break; 584 case PRID_IMP_R10000: 585 c->cputype = CPU_R10000; 586 __cpu_name[cpu] = "R10000"; 587 c->isa_level = MIPS_CPU_ISA_IV; 588 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 589 MIPS_CPU_FPU | MIPS_CPU_32FPR | 590 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 591 MIPS_CPU_LLSC; 592 c->tlbsize = 64; 593 break; 594 case PRID_IMP_R12000: 595 c->cputype = CPU_R12000; 596 __cpu_name[cpu] = "R12000"; 597 c->isa_level = MIPS_CPU_ISA_IV; 598 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 599 MIPS_CPU_FPU | MIPS_CPU_32FPR | 600 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 601 MIPS_CPU_LLSC; 602 c->tlbsize = 64; 603 break; 604 case PRID_IMP_R14000: 605 c->cputype = CPU_R14000; 606 __cpu_name[cpu] = "R14000"; 607 c->isa_level = MIPS_CPU_ISA_IV; 608 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 609 MIPS_CPU_FPU | MIPS_CPU_32FPR | 610 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 611 MIPS_CPU_LLSC; 612 c->tlbsize = 64; 613 break; 614 case PRID_IMP_LOONGSON2: 615 c->cputype = CPU_LOONGSON2; 616 __cpu_name[cpu] = "ICT Loongson-2"; 617 c->isa_level = MIPS_CPU_ISA_III; 618 c->options = R4K_OPTS | 619 MIPS_CPU_FPU | MIPS_CPU_LLSC | 620 MIPS_CPU_32FPR; 621 c->tlbsize = 64; 622 break; 623 } 624 } 625 626 static char unknown_isa[] __cpuinitdata = KERN_ERR \ 627 "Unsupported ISA type, c0.config0: %d."; 628 629 static inline unsigned int decode_config0(struct cpuinfo_mips *c) 630 { 631 unsigned int config0; 632 int isa; 633 634 config0 = read_c0_config(); 635 636 if (((config0 & MIPS_CONF_MT) >> 7) == 1) 637 c->options |= MIPS_CPU_TLB; 638 isa = (config0 & MIPS_CONF_AT) >> 13; 639 switch (isa) { 640 case 0: 641 switch ((config0 & MIPS_CONF_AR) >> 10) { 642 case 0: 643 c->isa_level = MIPS_CPU_ISA_M32R1; 644 break; 645 case 1: 646 c->isa_level = MIPS_CPU_ISA_M32R2; 647 break; 648 default: 649 goto unknown; 650 } 651 break; 652 case 2: 653 switch ((config0 & MIPS_CONF_AR) >> 10) { 654 case 0: 655 c->isa_level = MIPS_CPU_ISA_M64R1; 656 break; 657 case 1: 658 c->isa_level = MIPS_CPU_ISA_M64R2; 659 break; 660 default: 661 goto unknown; 662 } 663 break; 664 default: 665 goto unknown; 666 } 667 668 return config0 & MIPS_CONF_M; 669 670 unknown: 671 panic(unknown_isa, config0); 672 } 673 674 static inline unsigned int decode_config1(struct cpuinfo_mips *c) 675 { 676 unsigned int config1; 677 678 config1 = read_c0_config1(); 679 680 if (config1 & MIPS_CONF1_MD) 681 c->ases |= MIPS_ASE_MDMX; 682 if (config1 & MIPS_CONF1_WR) 683 c->options |= MIPS_CPU_WATCH; 684 if (config1 & MIPS_CONF1_CA) 685 c->ases |= MIPS_ASE_MIPS16; 686 if (config1 & MIPS_CONF1_EP) 687 c->options |= MIPS_CPU_EJTAG; 688 if (config1 & MIPS_CONF1_FP) { 689 c->options |= MIPS_CPU_FPU; 690 c->options |= MIPS_CPU_32FPR; 691 } 692 if (cpu_has_tlb) 693 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1; 694 695 return config1 & MIPS_CONF_M; 696 } 697 698 static inline unsigned int decode_config2(struct cpuinfo_mips *c) 699 { 700 unsigned int config2; 701 702 config2 = read_c0_config2(); 703 704 if (config2 & MIPS_CONF2_SL) 705 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT; 706 707 return config2 & MIPS_CONF_M; 708 } 709 710 static inline unsigned int decode_config3(struct cpuinfo_mips *c) 711 { 712 unsigned int config3; 713 714 config3 = read_c0_config3(); 715 716 if (config3 & MIPS_CONF3_SM) 717 c->ases |= MIPS_ASE_SMARTMIPS; 718 if (config3 & MIPS_CONF3_DSP) 719 c->ases |= MIPS_ASE_DSP; 720 if (config3 & MIPS_CONF3_VINT) 721 c->options |= MIPS_CPU_VINT; 722 if (config3 & MIPS_CONF3_VEIC) 723 c->options |= MIPS_CPU_VEIC; 724 if (config3 & MIPS_CONF3_MT) 725 c->ases |= MIPS_ASE_MIPSMT; 726 if (config3 & MIPS_CONF3_ULRI) 727 c->options |= MIPS_CPU_ULRI; 728 729 return config3 & MIPS_CONF_M; 730 } 731 732 static inline unsigned int decode_config4(struct cpuinfo_mips *c) 733 { 734 unsigned int config4; 735 736 config4 = read_c0_config4(); 737 738 if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT 739 && cpu_has_tlb) 740 c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40; 741 742 return config4 & MIPS_CONF_M; 743 } 744 745 static void __cpuinit decode_configs(struct cpuinfo_mips *c) 746 { 747 int ok; 748 749 /* MIPS32 or MIPS64 compliant CPU. */ 750 c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER | 751 MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK; 752 753 c->scache.flags = MIPS_CACHE_NOT_PRESENT; 754 755 ok = decode_config0(c); /* Read Config registers. */ 756 BUG_ON(!ok); /* Arch spec violation! */ 757 if (ok) 758 ok = decode_config1(c); 759 if (ok) 760 ok = decode_config2(c); 761 if (ok) 762 ok = decode_config3(c); 763 if (ok) 764 ok = decode_config4(c); 765 766 mips_probe_watch_registers(c); 767 768 if (cpu_has_mips_r2) 769 c->core = read_c0_ebase() & 0x3ff; 770 } 771 772 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu) 773 { 774 decode_configs(c); 775 switch (c->processor_id & 0xff00) { 776 case PRID_IMP_4KC: 777 c->cputype = CPU_4KC; 778 __cpu_name[cpu] = "MIPS 4Kc"; 779 break; 780 case PRID_IMP_4KEC: 781 case PRID_IMP_4KECR2: 782 c->cputype = CPU_4KEC; 783 __cpu_name[cpu] = "MIPS 4KEc"; 784 break; 785 case PRID_IMP_4KSC: 786 case PRID_IMP_4KSD: 787 c->cputype = CPU_4KSC; 788 __cpu_name[cpu] = "MIPS 4KSc"; 789 break; 790 case PRID_IMP_5KC: 791 c->cputype = CPU_5KC; 792 __cpu_name[cpu] = "MIPS 5Kc"; 793 break; 794 case PRID_IMP_20KC: 795 c->cputype = CPU_20KC; 796 __cpu_name[cpu] = "MIPS 20Kc"; 797 break; 798 case PRID_IMP_24K: 799 case PRID_IMP_24KE: 800 c->cputype = CPU_24K; 801 __cpu_name[cpu] = "MIPS 24Kc"; 802 break; 803 case PRID_IMP_25KF: 804 c->cputype = CPU_25KF; 805 __cpu_name[cpu] = "MIPS 25Kc"; 806 break; 807 case PRID_IMP_34K: 808 c->cputype = CPU_34K; 809 __cpu_name[cpu] = "MIPS 34Kc"; 810 break; 811 case PRID_IMP_74K: 812 c->cputype = CPU_74K; 813 __cpu_name[cpu] = "MIPS 74Kc"; 814 break; 815 case PRID_IMP_1004K: 816 c->cputype = CPU_1004K; 817 __cpu_name[cpu] = "MIPS 1004Kc"; 818 break; 819 } 820 821 spram_config(); 822 } 823 824 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu) 825 { 826 decode_configs(c); 827 switch (c->processor_id & 0xff00) { 828 case PRID_IMP_AU1_REV1: 829 case PRID_IMP_AU1_REV2: 830 c->cputype = CPU_ALCHEMY; 831 switch ((c->processor_id >> 24) & 0xff) { 832 case 0: 833 __cpu_name[cpu] = "Au1000"; 834 break; 835 case 1: 836 __cpu_name[cpu] = "Au1500"; 837 break; 838 case 2: 839 __cpu_name[cpu] = "Au1100"; 840 break; 841 case 3: 842 __cpu_name[cpu] = "Au1550"; 843 break; 844 case 4: 845 __cpu_name[cpu] = "Au1200"; 846 if ((c->processor_id & 0xff) == 2) 847 __cpu_name[cpu] = "Au1250"; 848 break; 849 case 5: 850 __cpu_name[cpu] = "Au1210"; 851 break; 852 default: 853 __cpu_name[cpu] = "Au1xxx"; 854 break; 855 } 856 break; 857 } 858 } 859 860 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu) 861 { 862 decode_configs(c); 863 864 switch (c->processor_id & 0xff00) { 865 case PRID_IMP_SB1: 866 c->cputype = CPU_SB1; 867 __cpu_name[cpu] = "SiByte SB1"; 868 /* FPU in pass1 is known to have issues. */ 869 if ((c->processor_id & 0xff) < 0x02) 870 c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR); 871 break; 872 case PRID_IMP_SB1A: 873 c->cputype = CPU_SB1A; 874 __cpu_name[cpu] = "SiByte SB1A"; 875 break; 876 } 877 } 878 879 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu) 880 { 881 decode_configs(c); 882 switch (c->processor_id & 0xff00) { 883 case PRID_IMP_SR71000: 884 c->cputype = CPU_SR71000; 885 __cpu_name[cpu] = "Sandcraft SR71000"; 886 c->scache.ways = 8; 887 c->tlbsize = 64; 888 break; 889 } 890 } 891 892 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu) 893 { 894 decode_configs(c); 895 switch (c->processor_id & 0xff00) { 896 case PRID_IMP_PR4450: 897 c->cputype = CPU_PR4450; 898 __cpu_name[cpu] = "Philips PR4450"; 899 c->isa_level = MIPS_CPU_ISA_M32R1; 900 break; 901 } 902 } 903 904 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu) 905 { 906 decode_configs(c); 907 switch (c->processor_id & 0xff00) { 908 case PRID_IMP_BMIPS32_REV4: 909 case PRID_IMP_BMIPS32_REV8: 910 c->cputype = CPU_BMIPS32; 911 __cpu_name[cpu] = "Broadcom BMIPS32"; 912 break; 913 case PRID_IMP_BMIPS3300: 914 case PRID_IMP_BMIPS3300_ALT: 915 case PRID_IMP_BMIPS3300_BUG: 916 c->cputype = CPU_BMIPS3300; 917 __cpu_name[cpu] = "Broadcom BMIPS3300"; 918 break; 919 case PRID_IMP_BMIPS43XX: { 920 int rev = c->processor_id & 0xff; 921 922 if (rev >= PRID_REV_BMIPS4380_LO && 923 rev <= PRID_REV_BMIPS4380_HI) { 924 c->cputype = CPU_BMIPS4380; 925 __cpu_name[cpu] = "Broadcom BMIPS4380"; 926 } else { 927 c->cputype = CPU_BMIPS4350; 928 __cpu_name[cpu] = "Broadcom BMIPS4350"; 929 } 930 break; 931 } 932 case PRID_IMP_BMIPS5000: 933 c->cputype = CPU_BMIPS5000; 934 __cpu_name[cpu] = "Broadcom BMIPS5000"; 935 c->options |= MIPS_CPU_ULRI; 936 break; 937 } 938 } 939 940 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu) 941 { 942 decode_configs(c); 943 switch (c->processor_id & 0xff00) { 944 case PRID_IMP_CAVIUM_CN38XX: 945 case PRID_IMP_CAVIUM_CN31XX: 946 case PRID_IMP_CAVIUM_CN30XX: 947 c->cputype = CPU_CAVIUM_OCTEON; 948 __cpu_name[cpu] = "Cavium Octeon"; 949 goto platform; 950 case PRID_IMP_CAVIUM_CN58XX: 951 case PRID_IMP_CAVIUM_CN56XX: 952 case PRID_IMP_CAVIUM_CN50XX: 953 case PRID_IMP_CAVIUM_CN52XX: 954 c->cputype = CPU_CAVIUM_OCTEON_PLUS; 955 __cpu_name[cpu] = "Cavium Octeon+"; 956 platform: 957 if (cpu == 0) 958 __elf_platform = "octeon"; 959 break; 960 case PRID_IMP_CAVIUM_CN63XX: 961 c->cputype = CPU_CAVIUM_OCTEON2; 962 __cpu_name[cpu] = "Cavium Octeon II"; 963 if (cpu == 0) 964 __elf_platform = "octeon2"; 965 break; 966 default: 967 printk(KERN_INFO "Unknown Octeon chip!\n"); 968 c->cputype = CPU_UNKNOWN; 969 break; 970 } 971 } 972 973 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) 974 { 975 decode_configs(c); 976 /* JZRISC does not implement the CP0 counter. */ 977 c->options &= ~MIPS_CPU_COUNTER; 978 switch (c->processor_id & 0xff00) { 979 case PRID_IMP_JZRISC: 980 c->cputype = CPU_JZRISC; 981 __cpu_name[cpu] = "Ingenic JZRISC"; 982 break; 983 default: 984 panic("Unknown Ingenic Processor ID!"); 985 break; 986 } 987 } 988 989 #ifdef CONFIG_64BIT 990 /* For use by uaccess.h */ 991 u64 __ua_limit; 992 EXPORT_SYMBOL(__ua_limit); 993 #endif 994 995 const char *__cpu_name[NR_CPUS]; 996 const char *__elf_platform; 997 998 __cpuinit void cpu_probe(void) 999 { 1000 struct cpuinfo_mips *c = ¤t_cpu_data; 1001 unsigned int cpu = smp_processor_id(); 1002 1003 c->processor_id = PRID_IMP_UNKNOWN; 1004 c->fpu_id = FPIR_IMP_NONE; 1005 c->cputype = CPU_UNKNOWN; 1006 1007 c->processor_id = read_c0_prid(); 1008 switch (c->processor_id & 0xff0000) { 1009 case PRID_COMP_LEGACY: 1010 cpu_probe_legacy(c, cpu); 1011 break; 1012 case PRID_COMP_MIPS: 1013 cpu_probe_mips(c, cpu); 1014 break; 1015 case PRID_COMP_ALCHEMY: 1016 cpu_probe_alchemy(c, cpu); 1017 break; 1018 case PRID_COMP_SIBYTE: 1019 cpu_probe_sibyte(c, cpu); 1020 break; 1021 case PRID_COMP_BROADCOM: 1022 cpu_probe_broadcom(c, cpu); 1023 break; 1024 case PRID_COMP_SANDCRAFT: 1025 cpu_probe_sandcraft(c, cpu); 1026 break; 1027 case PRID_COMP_NXP: 1028 cpu_probe_nxp(c, cpu); 1029 break; 1030 case PRID_COMP_CAVIUM: 1031 cpu_probe_cavium(c, cpu); 1032 break; 1033 case PRID_COMP_INGENIC: 1034 cpu_probe_ingenic(c, cpu); 1035 break; 1036 } 1037 1038 BUG_ON(!__cpu_name[cpu]); 1039 BUG_ON(c->cputype == CPU_UNKNOWN); 1040 1041 /* 1042 * Platform code can force the cpu type to optimize code 1043 * generation. In that case be sure the cpu type is correctly 1044 * manually setup otherwise it could trigger some nasty bugs. 1045 */ 1046 BUG_ON(current_cpu_type() != c->cputype); 1047 1048 if (mips_fpu_disabled) 1049 c->options &= ~MIPS_CPU_FPU; 1050 1051 if (mips_dsp_disabled) 1052 c->ases &= ~MIPS_ASE_DSP; 1053 1054 if (c->options & MIPS_CPU_FPU) { 1055 c->fpu_id = cpu_get_fpu_id(); 1056 1057 if (c->isa_level == MIPS_CPU_ISA_M32R1 || 1058 c->isa_level == MIPS_CPU_ISA_M32R2 || 1059 c->isa_level == MIPS_CPU_ISA_M64R1 || 1060 c->isa_level == MIPS_CPU_ISA_M64R2) { 1061 if (c->fpu_id & MIPS_FPIR_3D) 1062 c->ases |= MIPS_ASE_MIPS3D; 1063 } 1064 } 1065 1066 if (cpu_has_mips_r2) 1067 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1; 1068 else 1069 c->srsets = 1; 1070 1071 cpu_probe_vmbits(c); 1072 1073 #ifdef CONFIG_64BIT 1074 if (cpu == 0) 1075 __ua_limit = ~((1ull << cpu_vmbits) - 1); 1076 #endif 1077 } 1078 1079 __cpuinit void cpu_report(void) 1080 { 1081 struct cpuinfo_mips *c = ¤t_cpu_data; 1082 1083 printk(KERN_INFO "CPU revision is: %08x (%s)\n", 1084 c->processor_id, cpu_name_string()); 1085 if (c->options & MIPS_CPU_FPU) 1086 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id); 1087 } 1088