projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
MIPS: Clean up tables for bootmem allocation
[deliverable/linux.git] / arch / mips / kernel / cpu-probe.c
CommitLineData
1da177e4
LT		 1/*
2 * Processor capabilities determination functions.
3 *
4 * Copyright (C) xxxx the Anonymous
010b853b 5 * Copyright (C) 1994 - 2006 Ralf Baechle
4194318c 6 * Copyright (C) 2003, 2004 Maciej W. Rozycki
4194318c 7 * Copyright (C) 2001, 2004 MIPS Inc.
1da177e4
LT		 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 */
1da177e4
LT		 14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/ptrace.h>
631330f5 17#include <linux/smp.h>
1da177e4 18#include <linux/stddef.h>
f8ede0f7 19#include <linux/module.h>
1da177e4 20
5759906c 21#include <asm/bugs.h>
1da177e4
LT		 22#include <asm/cpu.h>
23#include <asm/fpu.h>
24#include <asm/mipsregs.h>
25#include <asm/system.h>
654f57bf 26#include <asm/watch.h>
a074f0e8 27#include <asm/spram.h>
1da177e4
LT		 28/*
29 * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
30 * the implementation of the "wait" feature differs between CPU families. This
31 * points to the function that implements CPU specific wait.
32 * The wait instruction stops the pipeline and reduces the power consumption of
33 * the CPU very much.
34 */
982f6ffe 35void (*cpu_wait)(void);
f8ede0f7 36EXPORT_SYMBOL(cpu_wait);
1da177e4
LT		 37
38static void r3081_wait(void)
39{
40 unsigned long cfg = read_c0_conf();
41 write_c0_conf(cfg | R30XX_CONF_HALT);
42}
43
44static void r39xx_wait(void)
45{
60a6c377
AN		 46 local_irq_disable();
47 if (!need_resched())
48 write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
49 local_irq_enable();
1da177e4
LT		 50}
51
c65a5480 52extern void r4k_wait(void);
60a6c377
AN		 53
54/*
55 * This variant is preferable as it allows testing need_resched and going to
56 * sleep depending on the outcome atomically. Unfortunately the "It is
57 * implementation-dependent whether the pipeline restarts when a non-enabled
58 * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
59 * using this version a gamble.
60 */
8531a35e 61void r4k_wait_irqoff(void)
60a6c377
AN		 62{
63 local_irq_disable();
64 if (!need_resched())
8531a35e
KK		 65 __asm__(" .set push \n"
66 " .set mips3 \n"
60a6c377 67 " wait \n"
8531a35e 68 " .set pop \n");
60a6c377 69 local_irq_enable();
8531a35e
KK		 70 __asm__(" .globl __pastwait \n"
71 "__pastwait: \n");
72 return;
1da177e4
LT		 73}
74
5a812999
RB		 75/*
76 * The RM7000 variant has to handle erratum 38. The workaround is to not
77 * have any pending stores when the WAIT instruction is executed.
78 */
79static void rm7k_wait_irqoff(void)
80{
81 local_irq_disable();
82 if (!need_resched())
83 __asm__(
84 " .set push \n"
85 " .set mips3 \n"
86 " .set noat \n"
87 " mfc0 $1, $12 \n"
88 " sync \n"
89 " mtc0 $1, $12 # stalls until W stage \n"
90 " wait \n"
91 " mtc0 $1, $12 # stalls until W stage \n"
92 " .set pop \n");
93 local_irq_enable();
94}
95
2882b0c6
ML		 96/*
97 * The Au1xxx wait is available only if using 32khz counter or
98 * external timer source, but specifically not CP0 Counter.
99 * alchemy/common/time.c may override cpu_wait!
100 */
494900af 101static void au1k_wait(void)
1da177e4 102{
60a6c377
AN		 103 __asm__(" .set mips3 \n"
104 " cache 0x14, 0(%0) \n"
105 " cache 0x14, 32(%0) \n"
106 " sync \n"
107 " nop \n"
108 " wait \n"
109 " nop \n"
110 " nop \n"
111 " nop \n"
112 " nop \n"
113 " .set mips0 \n"
10f650db 114 : : "r" (au1k_wait));
1da177e4
LT		 115}
116
982f6ffe 117static int __initdata nowait;
55d04dff 118
f49a747c 119static int __init wait_disable(char *s)
55d04dff
RB		 120{
121 nowait = 1;
122
123 return 1;
124}
125
126__setup("nowait", wait_disable);
127
c65a5480 128void __init check_wait(void)
1da177e4
LT		 129{
130 struct cpuinfo_mips *c = &current_cpu_data;
131
55d04dff 132 if (nowait) {
c2379230 133 printk("Wait instruction disabled.\n");
55d04dff
RB		 134 return;
135 }
136
1da177e4
LT		 137 switch (c->cputype) {
138 case CPU_R3081:
139 case CPU_R3081E:
140 cpu_wait = r3081_wait;
1da177e4
LT		 141 break;
142 case CPU_TX3927:
143 cpu_wait = r39xx_wait;
1da177e4
LT		 144 break;
145 case CPU_R4200:
146/* case CPU_R4300: */
147 case CPU_R4600:
148 case CPU_R4640:
149 case CPU_R4650:
150 case CPU_R4700:
151 case CPU_R5000:
a644b277 152 case CPU_R5500:
1da177e4 153 case CPU_NEVADA:
1da177e4
LT		 154 case CPU_4KC:
155 case CPU_4KEC:
156 case CPU_4KSC:
157 case CPU_5KC:
1da177e4 158 case CPU_25KF:
4b3e975e 159 case CPU_PR4450:
1c0c13eb 160 case CPU_BCM3302:
0de663ef
MB		 161 case CPU_BCM6338:
162 case CPU_BCM6348:
163 case CPU_BCM6358:
0dd4781b 164 case CPU_CAVIUM_OCTEON:
6f329468 165 case CPU_CAVIUM_OCTEON_PLUS:
4b3e975e
RB		 166 cpu_wait = r4k_wait;
167 break;
168
5a812999
RB		 169 case CPU_RM7000:
170 cpu_wait = rm7k_wait_irqoff;
171 break;
172
4b3e975e 173 case CPU_24K:
bbc7f22f 174 case CPU_34K:
39b8d525 175 case CPU_1004K:
4b3e975e
RB		 176 cpu_wait = r4k_wait;
177 if (read_c0_config7() & MIPS_CONF7_WII)
178 cpu_wait = r4k_wait_irqoff;
179 break;
180
c620953c 181 case CPU_74K:
1da177e4 182 cpu_wait = r4k_wait;
4b3e975e
RB		 183 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
184 cpu_wait = r4k_wait_irqoff;
1da177e4 185 break;
4b3e975e 186
60a6c377
AN		 187 case CPU_TX49XX:
188 cpu_wait = r4k_wait_irqoff;
60a6c377 189 break;
270717a8 190 case CPU_ALCHEMY:
0c694de1 191 cpu_wait = au1k_wait;
1da177e4 192 break;
c8eae71d
RB		 193 case CPU_20KC:
194 /*
195 * WAIT on Rev1.0 has E1, E2, E3 and E16.
196 * WAIT on Rev2.0 and Rev3.0 has E16.
197 * Rev3.1 WAIT is nop, why bother
198 */
199 if ((c->processor_id & 0xff) <= 0x64)
200 break;
201
50da469a
RB		 202 /*
203 * Another rev is incremeting c0_count at a reduced clock
204 * rate while in WAIT mode. So we basically have the choice
205 * between using the cp0 timer as clocksource or avoiding
206 * the WAIT instruction. Until more details are known,
207 * disable the use of WAIT for 20Kc entirely.
208 cpu_wait = r4k_wait;
209 */
c8eae71d 210 break;
441ee341 211 case CPU_RM9000:
c2379230 212 if ((c->processor_id & 0x00ff) >= 0x40)
441ee341 213 cpu_wait = r4k_wait;
441ee341 214 break;
1da177e4 215 default:
1da177e4
LT		 216 break;
217 }
218}
219
9267a30d
MSJ		 220static inline void check_errata(void)
221{
222 struct cpuinfo_mips *c = &current_cpu_data;
223
224 switch (c->cputype) {
225 case CPU_34K:
226 /*
227 * Erratum "RPS May Cause Incorrect Instruction Execution"
228 * This code only handles VPE0, any SMP/SMTC/RTOS code
229 * making use of VPE1 will be responsable for that VPE.
230 */
231 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
232 write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
233 break;
234 default:
235 break;
236 }
237}
238
1da177e4
LT		 239void __init check_bugs32(void)
240{
9267a30d 241 check_errata();
1da177e4
LT		 242}
243
244/*
245 * Probe whether cpu has config register by trying to play with
246 * alternate cache bit and see whether it matters.
247 * It's used by cpu_probe to distinguish between R3000A and R3081.
248 */
249static inline int cpu_has_confreg(void)
250{
251#ifdef CONFIG_CPU_R3000
252 extern unsigned long r3k_cache_size(unsigned long);
253 unsigned long size1, size2;
254 unsigned long cfg = read_c0_conf();
255
256 size1 = r3k_cache_size(ST0_ISC);
257 write_c0_conf(cfg ^ R30XX_CONF_AC);
258 size2 = r3k_cache_size(ST0_ISC);
259 write_c0_conf(cfg);
260 return size1 != size2;
261#else
262 return 0;
263#endif
264}
265
266/*
267 * Get the FPU Implementation/Revision.
268 */
269static inline unsigned long cpu_get_fpu_id(void)
270{
271 unsigned long tmp, fpu_id;
272
273 tmp = read_c0_status();
274 __enable_fpu();
275 fpu_id = read_32bit_cp1_register(CP1_REVISION);
276 write_c0_status(tmp);
277 return fpu_id;
278}
279
280/*
281 * Check the CPU has an FPU the official way.
282 */
283static inline int __cpu_has_fpu(void)
284{
285 return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
286}
287
91dfc423
GR		 288static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
289{
290#ifdef __NEED_VMBITS_PROBE
5b7efa89 291 write_c0_entryhi(0x3fffffffffffe000ULL);
91dfc423 292 back_to_back_c0_hazard();
5b7efa89 293 c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
91dfc423
GR		 294#endif
295}
296
02cf2119 297#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
1da177e4
LT		 298 | MIPS_CPU_COUNTER)
299
cea7e2df 300static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
1da177e4
LT		 301{
302 switch (c->processor_id & 0xff00) {
303 case PRID_IMP_R2000:
304 c->cputype = CPU_R2000;
cea7e2df 305 __cpu_name[cpu] = "R2000";
1da177e4 306 c->isa_level = MIPS_CPU_ISA_I;
02cf2119
RB		 307 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
308 MIPS_CPU_NOFPUEX;
1da177e4
LT		 309 if (__cpu_has_fpu())
310 c->options |= MIPS_CPU_FPU;
311 c->tlbsize = 64;
312 break;
313 case PRID_IMP_R3000:
cea7e2df
RB		 314 if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
315 if (cpu_has_confreg()) {
1da177e4 316 c->cputype = CPU_R3081E;
cea7e2df
RB		 317 __cpu_name[cpu] = "R3081";
318 } else {
1da177e4 319 c->cputype = CPU_R3000A;
cea7e2df
RB		 320 __cpu_name[cpu] = "R3000A";
321 }
322 break;
323 } else {
1da177e4 324 c->cputype = CPU_R3000;
cea7e2df
RB		 325 __cpu_name[cpu] = "R3000";
326 }
1da177e4 327 c->isa_level = MIPS_CPU_ISA_I;
02cf2119
RB		 328 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
329 MIPS_CPU_NOFPUEX;
1da177e4
LT		 330 if (__cpu_has_fpu())
331 c->options |= MIPS_CPU_FPU;
332 c->tlbsize = 64;
333 break;
334 case PRID_IMP_R4000:
335 if (read_c0_config() & CONF_SC) {
cea7e2df 336 if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
1da177e4 337 c->cputype = CPU_R4400PC;
cea7e2df
RB		 338 __cpu_name[cpu] = "R4400PC";
339 } else {
1da177e4 340 c->cputype = CPU_R4000PC;
cea7e2df
RB		 341 __cpu_name[cpu] = "R4000PC";
342 }
1da177e4 343 } else {
cea7e2df 344 if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
1da177e4 345 c->cputype = CPU_R4400SC;
cea7e2df
RB		 346 __cpu_name[cpu] = "R4400SC";
347 } else {
1da177e4 348 c->cputype = CPU_R4000SC;
cea7e2df
RB		 349 __cpu_name[cpu] = "R4000SC";
350 }
1da177e4
LT		 351 }
352
353 c->isa_level = MIPS_CPU_ISA_III;
354 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
355 MIPS_CPU_WATCH | MIPS_CPU_VCE |
356 MIPS_CPU_LLSC;
357 c->tlbsize = 48;
358 break;
359 case PRID_IMP_VR41XX:
360 switch (c->processor_id & 0xf0) {
1da177e4
LT		 361 case PRID_REV_VR4111:
362 c->cputype = CPU_VR4111;
cea7e2df 363 __cpu_name[cpu] = "NEC VR4111";
1da177e4 364 break;
1da177e4
LT		 365 case PRID_REV_VR4121:
366 c->cputype = CPU_VR4121;
cea7e2df 367 __cpu_name[cpu] = "NEC VR4121";
1da177e4
LT		 368 break;
369 case PRID_REV_VR4122:
cea7e2df 370 if ((c->processor_id & 0xf) < 0x3) {
1da177e4 371 c->cputype = CPU_VR4122;
cea7e2df
RB		 372 __cpu_name[cpu] = "NEC VR4122";
373 } else {
1da177e4 374 c->cputype = CPU_VR4181A;
cea7e2df
RB		 375 __cpu_name[cpu] = "NEC VR4181A";
376 }
1da177e4
LT		 377 break;
378 case PRID_REV_VR4130:
cea7e2df 379 if ((c->processor_id & 0xf) < 0x4) {
1da177e4 380 c->cputype = CPU_VR4131;
cea7e2df
RB		 381 __cpu_name[cpu] = "NEC VR4131";
382 } else {
1da177e4 383 c->cputype = CPU_VR4133;
cea7e2df
RB		 384 __cpu_name[cpu] = "NEC VR4133";
385 }
1da177e4
LT		 386 break;
387 default:
388 printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
389 c->cputype = CPU_VR41XX;
cea7e2df 390 __cpu_name[cpu] = "NEC Vr41xx";
1da177e4
LT		 391 break;
392 }
393 c->isa_level = MIPS_CPU_ISA_III;
394 c->options = R4K_OPTS;
395 c->tlbsize = 32;
396 break;
397 case PRID_IMP_R4300:
398 c->cputype = CPU_R4300;
cea7e2df 399 __cpu_name[cpu] = "R4300";
1da177e4
LT		 400 c->isa_level = MIPS_CPU_ISA_III;
401 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
402 MIPS_CPU_LLSC;
403 c->tlbsize = 32;
404 break;
405 case PRID_IMP_R4600:
406 c->cputype = CPU_R4600;
cea7e2df 407 __cpu_name[cpu] = "R4600";
1da177e4 408 c->isa_level = MIPS_CPU_ISA_III;
075e7502
TS		 409 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
410 MIPS_CPU_LLSC;
1da177e4
LT		 411 c->tlbsize = 48;
412 break;
413 #if 0
414 case PRID_IMP_R4650:
415 /*
416 * This processor doesn't have an MMU, so it's not
417 * "real easy" to run Linux on it. It is left purely
418 * for documentation. Commented out because it shares
419 * it's c0_prid id number with the TX3900.
420 */
a3dddd56 421 c->cputype = CPU_R4650;
cea7e2df 422 __cpu_name[cpu] = "R4650";
1da177e4
LT		 423 c->isa_level = MIPS_CPU_ISA_III;
424 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
425 c->tlbsize = 48;
426 break;
427 #endif
428 case PRID_IMP_TX39:
429 c->isa_level = MIPS_CPU_ISA_I;
02cf2119 430 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
1da177e4
LT		 431
432 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
433 c->cputype = CPU_TX3927;
cea7e2df 434 __cpu_name[cpu] = "TX3927";
1da177e4
LT		 435 c->tlbsize = 64;
436 } else {
437 switch (c->processor_id & 0xff) {
438 case PRID_REV_TX3912:
439 c->cputype = CPU_TX3912;
cea7e2df 440 __cpu_name[cpu] = "TX3912";
1da177e4
LT		 441 c->tlbsize = 32;
442 break;
443 case PRID_REV_TX3922:
444 c->cputype = CPU_TX3922;
cea7e2df 445 __cpu_name[cpu] = "TX3922";
1da177e4
LT		 446 c->tlbsize = 64;
447 break;
1da177e4
LT		 448 }
449 }
450 break;
451 case PRID_IMP_R4700:
452 c->cputype = CPU_R4700;
cea7e2df 453 __cpu_name[cpu] = "R4700";
1da177e4
LT		 454 c->isa_level = MIPS_CPU_ISA_III;
455 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
456 MIPS_CPU_LLSC;
457 c->tlbsize = 48;
458 break;
459 case PRID_IMP_TX49:
460 c->cputype = CPU_TX49XX;
cea7e2df 461 __cpu_name[cpu] = "R49XX";
1da177e4
LT		 462 c->isa_level = MIPS_CPU_ISA_III;
463 c->options = R4K_OPTS | MIPS_CPU_LLSC;
464 if (!(c->processor_id & 0x08))
465 c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
466 c->tlbsize = 48;
467 break;
468 case PRID_IMP_R5000:
469 c->cputype = CPU_R5000;
cea7e2df 470 __cpu_name[cpu] = "R5000";
1da177e4
LT		 471 c->isa_level = MIPS_CPU_ISA_IV;
472 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
473 MIPS_CPU_LLSC;
474 c->tlbsize = 48;
475 break;
476 case PRID_IMP_R5432:
477 c->cputype = CPU_R5432;
cea7e2df 478 __cpu_name[cpu] = "R5432";
1da177e4
LT		 479 c->isa_level = MIPS_CPU_ISA_IV;
480 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
481 MIPS_CPU_WATCH | MIPS_CPU_LLSC;
482 c->tlbsize = 48;
483 break;
484 case PRID_IMP_R5500:
485 c->cputype = CPU_R5500;
cea7e2df 486 __cpu_name[cpu] = "R5500";
1da177e4
LT		 487 c->isa_level = MIPS_CPU_ISA_IV;
488 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
489 MIPS_CPU_WATCH | MIPS_CPU_LLSC;
490 c->tlbsize = 48;
491 break;
492 case PRID_IMP_NEVADA:
493 c->cputype = CPU_NEVADA;
cea7e2df 494 __cpu_name[cpu] = "Nevada";
1da177e4
LT		 495 c->isa_level = MIPS_CPU_ISA_IV;
496 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
497 MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
498 c->tlbsize = 48;
499 break;
500 case PRID_IMP_R6000:
501 c->cputype = CPU_R6000;
cea7e2df 502 __cpu_name[cpu] = "R6000";
1da177e4
LT		 503 c->isa_level = MIPS_CPU_ISA_II;
504 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
505 MIPS_CPU_LLSC;
506 c->tlbsize = 32;
507 break;
508 case PRID_IMP_R6000A:
509 c->cputype = CPU_R6000A;
cea7e2df 510 __cpu_name[cpu] = "R6000A";
1da177e4
LT		 511 c->isa_level = MIPS_CPU_ISA_II;
512 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
513 MIPS_CPU_LLSC;
514 c->tlbsize = 32;
515 break;
516 case PRID_IMP_RM7000:
517 c->cputype = CPU_RM7000;
cea7e2df 518 __cpu_name[cpu] = "RM7000";
1da177e4
LT		 519 c->isa_level = MIPS_CPU_ISA_IV;
520 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
521 MIPS_CPU_LLSC;
522 /*
523 * Undocumented RM7000: Bit 29 in the info register of
524 * the RM7000 v2.0 indicates if the TLB has 48 or 64
525 * entries.
526 *
527 * 29 1 => 64 entry JTLB
528 * 0 => 48 entry JTLB
529 */
530 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
531 break;
532 case PRID_IMP_RM9000:
533 c->cputype = CPU_RM9000;
cea7e2df 534 __cpu_name[cpu] = "RM9000";
1da177e4
LT		 535 c->isa_level = MIPS_CPU_ISA_IV;
536 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
537 MIPS_CPU_LLSC;
538 /*
539 * Bit 29 in the info register of the RM9000
540 * indicates if the TLB has 48 or 64 entries.
541 *
542 * 29 1 => 64 entry JTLB
543 * 0 => 48 entry JTLB
544 */
545 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
546 break;
547 case PRID_IMP_R8000:
548 c->cputype = CPU_R8000;
cea7e2df 549 __cpu_name[cpu] = "RM8000";
1da177e4
LT		 550 c->isa_level = MIPS_CPU_ISA_IV;
551 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
552 MIPS_CPU_FPU | MIPS_CPU_32FPR |
553 MIPS_CPU_LLSC;
554 c->tlbsize = 384; /* has weird TLB: 3-way x 128 */
555 break;
556 case PRID_IMP_R10000:
557 c->cputype = CPU_R10000;
cea7e2df 558 __cpu_name[cpu] = "R10000";
1da177e4 559 c->isa_level = MIPS_CPU_ISA_IV;
8b36612a 560 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1da177e4
LT		 561 MIPS_CPU_FPU | MIPS_CPU_32FPR |
562 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
563 MIPS_CPU_LLSC;
564 c->tlbsize = 64;
565 break;
566 case PRID_IMP_R12000:
567 c->cputype = CPU_R12000;
cea7e2df 568 __cpu_name[cpu] = "R12000";
1da177e4 569 c->isa_level = MIPS_CPU_ISA_IV;
8b36612a 570 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1da177e4
LT		 571 MIPS_CPU_FPU | MIPS_CPU_32FPR |
572 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
573 MIPS_CPU_LLSC;
574 c->tlbsize = 64;
575 break;
44d921b2
K		 576 case PRID_IMP_R14000:
577 c->cputype = CPU_R14000;
cea7e2df 578 __cpu_name[cpu] = "R14000";
44d921b2
K		 579 c->isa_level = MIPS_CPU_ISA_IV;
580 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
581 MIPS_CPU_FPU | MIPS_CPU_32FPR |
582 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
583 MIPS_CPU_LLSC;
584 c->tlbsize = 64;
585 break;
2a21c730
FZ		 586 case PRID_IMP_LOONGSON2:
587 c->cputype = CPU_LOONGSON2;
cea7e2df 588 __cpu_name[cpu] = "ICT Loongson-2";
2a21c730
FZ		 589 c->isa_level = MIPS_CPU_ISA_III;
590 c->options = R4K_OPTS |
591 MIPS_CPU_FPU | MIPS_CPU_LLSC |
592 MIPS_CPU_32FPR;
593 c->tlbsize = 64;
594 break;
1da177e4
LT		 595 }
596}
597
234fcd14 598static char unknown_isa[] __cpuinitdata = KERN_ERR \
b4672d37
RB		 599 "Unsupported ISA type, c0.config0: %d.";
600
4194318c 601static inline unsigned int decode_config0(struct cpuinfo_mips *c)
1da177e4 602{
4194318c
RB		 603 unsigned int config0;
604 int isa;
1da177e4 605
4194318c
RB		 606 config0 = read_c0_config();
607
608 if (((config0 & MIPS_CONF_MT) >> 7) == 1)
02cf2119 609 c->options |= MIPS_CPU_TLB;
4194318c
RB		 610 isa = (config0 & MIPS_CONF_AT) >> 13;
611 switch (isa) {
612 case 0:
3a01c49a 613 switch ((config0 & MIPS_CONF_AR) >> 10) {
b4672d37
RB		 614 case 0:
615 c->isa_level = MIPS_CPU_ISA_M32R1;
616 break;
617 case 1:
618 c->isa_level = MIPS_CPU_ISA_M32R2;
619 break;
620 default:
621 goto unknown;
622 }
4194318c
RB		 623 break;
624 case 2:
3a01c49a 625 switch ((config0 & MIPS_CONF_AR) >> 10) {
b4672d37
RB		 626 case 0:
627 c->isa_level = MIPS_CPU_ISA_M64R1;
628 break;
629 case 1:
630 c->isa_level = MIPS_CPU_ISA_M64R2;
631 break;
632 default:
633 goto unknown;
634 }
4194318c
RB		 635 break;
636 default:
b4672d37 637 goto unknown;
4194318c
RB		 638 }
639
640 return config0 & MIPS_CONF_M;
b4672d37
RB		 641
642unknown:
643 panic(unknown_isa, config0);
4194318c
RB		 644}
645
646static inline unsigned int decode_config1(struct cpuinfo_mips *c)
647{
648 unsigned int config1;
1da177e4 649
1da177e4 650 config1 = read_c0_config1();
4194318c
RB		 651
652 if (config1 & MIPS_CONF1_MD)
653 c->ases |= MIPS_ASE_MDMX;
654 if (config1 & MIPS_CONF1_WR)
1da177e4 655 c->options |= MIPS_CPU_WATCH;
4194318c
RB		 656 if (config1 & MIPS_CONF1_CA)
657 c->ases |= MIPS_ASE_MIPS16;
658 if (config1 & MIPS_CONF1_EP)
1da177e4 659 c->options |= MIPS_CPU_EJTAG;
4194318c 660 if (config1 & MIPS_CONF1_FP) {
1da177e4
LT		 661 c->options |= MIPS_CPU_FPU;
662 c->options |= MIPS_CPU_32FPR;
663 }
4194318c
RB		 664 if (cpu_has_tlb)
665 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
666
667 return config1 & MIPS_CONF_M;
668}
669
670static inline unsigned int decode_config2(struct cpuinfo_mips *c)
671{
672 unsigned int config2;
673
674 config2 = read_c0_config2();
675
676 if (config2 & MIPS_CONF2_SL)
677 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
678
679 return config2 & MIPS_CONF_M;
680}
681
682static inline unsigned int decode_config3(struct cpuinfo_mips *c)
683{
684 unsigned int config3;
685
686 config3 = read_c0_config3();
687
688 if (config3 & MIPS_CONF3_SM)
689 c->ases |= MIPS_ASE_SMARTMIPS;
e50c0a8f
RB		 690 if (config3 & MIPS_CONF3_DSP)
691 c->ases |= MIPS_ASE_DSP;
8f40611d
RB		 692 if (config3 & MIPS_CONF3_VINT)
693 c->options |= MIPS_CPU_VINT;
694 if (config3 & MIPS_CONF3_VEIC)
695 c->options |= MIPS_CPU_VEIC;
696 if (config3 & MIPS_CONF3_MT)
e0daad44 697 c->ases |= MIPS_ASE_MIPSMT;
a3692020
RB		 698 if (config3 & MIPS_CONF3_ULRI)
699 c->options |= MIPS_CPU_ULRI;
4194318c
RB		 700
701 return config3 & MIPS_CONF_M;
702}
703
1b362e3e
DD		 704static inline unsigned int decode_config4(struct cpuinfo_mips *c)
705{
706 unsigned int config4;
707
708 config4 = read_c0_config4();
709
710 if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT
711 && cpu_has_tlb)
712 c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
713
714 return config4 & MIPS_CONF_M;
715}
716
234fcd14 717static void __cpuinit decode_configs(struct cpuinfo_mips *c)
4194318c 718{
558ce124
RB		 719 int ok;
720
4194318c 721 /* MIPS32 or MIPS64 compliant CPU. */
02cf2119
RB		 722 c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
723 MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
4194318c 724
1da177e4
LT		 725 c->scache.flags = MIPS_CACHE_NOT_PRESENT;
726
558ce124
RB		 727 ok = decode_config0(c); /* Read Config registers. */
728 BUG_ON(!ok); /* Arch spec violation! */
729 if (ok)
730 ok = decode_config1(c);
731 if (ok)
732 ok = decode_config2(c);
733 if (ok)
734 ok = decode_config3(c);
1b362e3e
DD		 735 if (ok)
736 ok = decode_config4(c);
558ce124
RB		 737
738 mips_probe_watch_registers(c);
1da177e4
LT		 739}
740
cea7e2df 741static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
1da177e4 742{
4194318c 743 decode_configs(c);
1da177e4
LT		 744 switch (c->processor_id & 0xff00) {
745 case PRID_IMP_4KC:
746 c->cputype = CPU_4KC;
cea7e2df 747 __cpu_name[cpu] = "MIPS 4Kc";
1da177e4
LT		 748 break;
749 case PRID_IMP_4KEC:
2b07bd02
RB		 750 case PRID_IMP_4KECR2:
751 c->cputype = CPU_4KEC;
cea7e2df 752 __cpu_name[cpu] = "MIPS 4KEc";
2b07bd02 753 break;
1da177e4 754 case PRID_IMP_4KSC:
8afcb5d8 755 case PRID_IMP_4KSD:
1da177e4 756 c->cputype = CPU_4KSC;
cea7e2df 757 __cpu_name[cpu] = "MIPS 4KSc";
1da177e4
LT		 758 break;
759 case PRID_IMP_5KC:
760 c->cputype = CPU_5KC;
cea7e2df 761 __cpu_name[cpu] = "MIPS 5Kc";
1da177e4
LT		 762 break;
763 case PRID_IMP_20KC:
764 c->cputype = CPU_20KC;
cea7e2df 765 __cpu_name[cpu] = "MIPS 20Kc";
1da177e4
LT		 766 break;
767 case PRID_IMP_24K:
e50c0a8f 768 case PRID_IMP_24KE:
1da177e4 769 c->cputype = CPU_24K;
cea7e2df 770 __cpu_name[cpu] = "MIPS 24Kc";
1da177e4
LT		 771 break;
772 case PRID_IMP_25KF:
773 c->cputype = CPU_25KF;
cea7e2df 774 __cpu_name[cpu] = "MIPS 25Kc";
1da177e4 775 break;
bbc7f22f
RB		 776 case PRID_IMP_34K:
777 c->cputype = CPU_34K;
cea7e2df 778 __cpu_name[cpu] = "MIPS 34Kc";
bbc7f22f 779 break;
c620953c
CD		 780 case PRID_IMP_74K:
781 c->cputype = CPU_74K;
cea7e2df 782 __cpu_name[cpu] = "MIPS 74Kc";
c620953c 783 break;
39b8d525
RB		 784 case PRID_IMP_1004K:
785 c->cputype = CPU_1004K;
cea7e2df 786 __cpu_name[cpu] = "MIPS 1004Kc";
39b8d525 787 break;
1da177e4 788 }
0b6d497f
CD		 789
790 spram_config();
1da177e4
LT		 791}
792
cea7e2df 793static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
1da177e4 794{
4194318c 795 decode_configs(c);
1da177e4
LT		 796 switch (c->processor_id & 0xff00) {
797 case PRID_IMP_AU1_REV1:
798 case PRID_IMP_AU1_REV2:
270717a8 799 c->cputype = CPU_ALCHEMY;
1da177e4
LT		 800 switch ((c->processor_id >> 24) & 0xff) {
801 case 0:
cea7e2df 802 __cpu_name[cpu] = "Au1000";
1da177e4
LT		 803 break;
804 case 1:
cea7e2df 805 __cpu_name[cpu] = "Au1500";
1da177e4
LT		 806 break;
807 case 2:
cea7e2df 808 __cpu_name[cpu] = "Au1100";
1da177e4
LT		 809 break;
810 case 3:
cea7e2df 811 __cpu_name[cpu] = "Au1550";
1da177e4 812 break;
e3ad1c23 813 case 4:
cea7e2df 814 __cpu_name[cpu] = "Au1200";
270717a8 815 if ((c->processor_id & 0xff) == 2)
cea7e2df 816 __cpu_name[cpu] = "Au1250";
237cfee1
ML		 817 break;
818 case 5:
cea7e2df 819 __cpu_name[cpu] = "Au1210";
e3ad1c23 820 break;
1da177e4 821 default:
270717a8 822 __cpu_name[cpu] = "Au1xxx";
1da177e4
LT		 823 break;
824 }
1da177e4
LT		 825 break;
826 }
827}
828
cea7e2df 829static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
1da177e4 830{
4194318c 831 decode_configs(c);
02cf2119 832
1da177e4
LT		 833 switch (c->processor_id & 0xff00) {
834 case PRID_IMP_SB1:
835 c->cputype = CPU_SB1;
cea7e2df 836 __cpu_name[cpu] = "SiByte SB1";
1da177e4 837 /* FPU in pass1 is known to have issues. */
aa32374a 838 if ((c->processor_id & 0xff) < 0x02)
010b853b 839 c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
1da177e4 840 break;
93ce2f52
AI		 841 case PRID_IMP_SB1A:
842 c->cputype = CPU_SB1A;
cea7e2df 843 __cpu_name[cpu] = "SiByte SB1A";
93ce2f52 844 break;
1da177e4
LT		 845 }
846}
847
cea7e2df 848static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
1da177e4 849{
4194318c 850 decode_configs(c);
1da177e4
LT		 851 switch (c->processor_id & 0xff00) {
852 case PRID_IMP_SR71000:
853 c->cputype = CPU_SR71000;
cea7e2df 854 __cpu_name[cpu] = "Sandcraft SR71000";
1da177e4
LT		 855 c->scache.ways = 8;
856 c->tlbsize = 64;
857 break;
858 }
859}
860
cea7e2df 861static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
bdf21b18
PP		 862{
863 decode_configs(c);
864 switch (c->processor_id & 0xff00) {
865 case PRID_IMP_PR4450:
866 c->cputype = CPU_PR4450;
cea7e2df 867 __cpu_name[cpu] = "Philips PR4450";
e7958bb9 868 c->isa_level = MIPS_CPU_ISA_M32R1;
bdf21b18 869 break;
bdf21b18
PP		 870 }
871}
872
cea7e2df 873static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
1c0c13eb
AJ		 874{
875 decode_configs(c);
876 switch (c->processor_id & 0xff00) {
877 case PRID_IMP_BCM3302:
0de663ef 878 /* same as PRID_IMP_BCM6338 */
1c0c13eb 879 c->cputype = CPU_BCM3302;
cea7e2df 880 __cpu_name[cpu] = "Broadcom BCM3302";
1c0c13eb
AJ		 881 break;
882 case PRID_IMP_BCM4710:
883 c->cputype = CPU_BCM4710;
cea7e2df 884 __cpu_name[cpu] = "Broadcom BCM4710";
1c0c13eb 885 break;
0de663ef
MB		 886 case PRID_IMP_BCM6345:
887 c->cputype = CPU_BCM6345;
888 __cpu_name[cpu] = "Broadcom BCM6345";
889 break;
890 case PRID_IMP_BCM6348:
891 c->cputype = CPU_BCM6348;
892 __cpu_name[cpu] = "Broadcom BCM6348";
893 break;
894 case PRID_IMP_BCM4350:
895 switch (c->processor_id & 0xf0) {
896 case PRID_REV_BCM6358:
897 c->cputype = CPU_BCM6358;
898 __cpu_name[cpu] = "Broadcom BCM6358";
899 break;
900 default:
901 c->cputype = CPU_UNKNOWN;
902 break;
903 }
904 break;
1c0c13eb
AJ		 905 }
906}
907
0dd4781b
DD		 908static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
909{
910 decode_configs(c);
911 switch (c->processor_id & 0xff00) {
912 case PRID_IMP_CAVIUM_CN38XX:
913 case PRID_IMP_CAVIUM_CN31XX:
914 case PRID_IMP_CAVIUM_CN30XX:
6f329468
DD		 915 c->cputype = CPU_CAVIUM_OCTEON;
916 __cpu_name[cpu] = "Cavium Octeon";
917 goto platform;
0dd4781b
DD		 918 case PRID_IMP_CAVIUM_CN58XX:
919 case PRID_IMP_CAVIUM_CN56XX:
920 case PRID_IMP_CAVIUM_CN50XX:
921 case PRID_IMP_CAVIUM_CN52XX:
6f329468
DD		 922 c->cputype = CPU_CAVIUM_OCTEON_PLUS;
923 __cpu_name[cpu] = "Cavium Octeon+";
924platform:
368bf8ef
DD		 925 if (cpu == 0)
926 __elf_platform = "octeon";
0dd4781b
DD		 927 break;
928 default:
929 printk(KERN_INFO "Unknown Octeon chip!\n");
930 c->cputype = CPU_UNKNOWN;
931 break;
932 }
933}
934
9966db25 935const char *__cpu_name[NR_CPUS];
874fd3b5 936const char *__elf_platform;
9966db25 937
234fcd14 938__cpuinit void cpu_probe(void)
1da177e4
LT		 939{
940 struct cpuinfo_mips *c = &current_cpu_data;
9966db25 941 unsigned int cpu = smp_processor_id();
1da177e4
LT		 942
943 c->processor_id = PRID_IMP_UNKNOWN;
944 c->fpu_id = FPIR_IMP_NONE;
945 c->cputype = CPU_UNKNOWN;
946
947 c->processor_id = read_c0_prid();
948 switch (c->processor_id & 0xff0000) {
949 case PRID_COMP_LEGACY:
cea7e2df 950 cpu_probe_legacy(c, cpu);
1da177e4
LT		 951 break;
952 case PRID_COMP_MIPS:
cea7e2df 953 cpu_probe_mips(c, cpu);
1da177e4
LT		 954 break;
955 case PRID_COMP_ALCHEMY:
cea7e2df 956 cpu_probe_alchemy(c, cpu);
1da177e4
LT		 957 break;
958 case PRID_COMP_SIBYTE:
cea7e2df 959 cpu_probe_sibyte(c, cpu);
1da177e4 960 break;
1c0c13eb 961 case PRID_COMP_BROADCOM:
cea7e2df 962 cpu_probe_broadcom(c, cpu);
1c0c13eb 963 break;
1da177e4 964 case PRID_COMP_SANDCRAFT:
cea7e2df 965 cpu_probe_sandcraft(c, cpu);
1da177e4 966 break;
a92b0588 967 case PRID_COMP_NXP:
cea7e2df 968 cpu_probe_nxp(c, cpu);
a3dddd56 969 break;
0dd4781b
DD		 970 case PRID_COMP_CAVIUM:
971 cpu_probe_cavium(c, cpu);
972 break;
1da177e4 973 }
dec8b1ca 974
cea7e2df
RB		 975 BUG_ON(!__cpu_name[cpu]);
976 BUG_ON(c->cputype == CPU_UNKNOWN);
977
dec8b1ca
FBH		 978 /*
979 * Platform code can force the cpu type to optimize code
980 * generation. In that case be sure the cpu type is correctly
981 * manually setup otherwise it could trigger some nasty bugs.
982 */
983 BUG_ON(current_cpu_type() != c->cputype);
984
4194318c 985 if (c->options & MIPS_CPU_FPU) {
1da177e4 986 c->fpu_id = cpu_get_fpu_id();
4194318c 987
e7958bb9 988 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
b4672d37
RB		 989 c->isa_level == MIPS_CPU_ISA_M32R2 ||
990 c->isa_level == MIPS_CPU_ISA_M64R1 ||
991 c->isa_level == MIPS_CPU_ISA_M64R2) {
4194318c
RB		 992 if (c->fpu_id & MIPS_FPIR_3D)
993 c->ases |= MIPS_ASE_MIPS3D;
994 }
995 }
9966db25 996
f6771dbb
RB		 997 if (cpu_has_mips_r2)
998 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
999 else
1000 c->srsets = 1;
91dfc423
GR		 1001
1002 cpu_probe_vmbits(c);
1da177e4
LT		 1003}
1004
234fcd14 1005__cpuinit void cpu_report(void)
1da177e4
LT		 1006{
1007 struct cpuinfo_mips *c = &current_cpu_data;
1008
9966db25
RB		 1009 printk(KERN_INFO "CPU revision is: %08x (%s)\n",
1010 c->processor_id, cpu_name_string());
1da177e4 1011 if (c->options & MIPS_CPU_FPU)
9966db25 1012 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1da177e4 1013}
Linux kernel - Deliverables
This page took 0.551719 seconds and 5 git commands to generate.