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MIPS: Alchemy: Convert dbdma.c to syscore_ops
[linux-2.6/linux-mips.git] / arch / mips / kernel / cpu-probe.c
blobc7b7eb24e277b7bfa4616dafc29f910a800dc9a3
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 = &current_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 = &current_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 c->kscratch_mask = (config4 >> 16) & 0xff;
743
744 return config4 & MIPS_CONF_M;
745 }
746
747 static void __cpuinit decode_configs(struct cpuinfo_mips *c)
748 {
749 int ok;
750
751 /* MIPS32 or MIPS64 compliant CPU. */
752 c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
753 MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
754
755 c->scache.flags = MIPS_CACHE_NOT_PRESENT;
756
757 ok = decode_config0(c); /* Read Config registers. */
758 BUG_ON(!ok); /* Arch spec violation! */
759 if (ok)
760 ok = decode_config1(c);
761 if (ok)
762 ok = decode_config2(c);
763 if (ok)
764 ok = decode_config3(c);
765 if (ok)
766 ok = decode_config4(c);
767
768 mips_probe_watch_registers(c);
769
770 if (cpu_has_mips_r2)
771 c->core = read_c0_ebase() & 0x3ff;
772 }
773
774 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
775 {
776 decode_configs(c);
777 switch (c->processor_id & 0xff00) {
778 case PRID_IMP_4KC:
779 c->cputype = CPU_4KC;
780 __cpu_name[cpu] = "MIPS 4Kc";
781 break;
782 case PRID_IMP_4KEC:
783 case PRID_IMP_4KECR2:
784 c->cputype = CPU_4KEC;
785 __cpu_name[cpu] = "MIPS 4KEc";
786 break;
787 case PRID_IMP_4KSC:
788 case PRID_IMP_4KSD:
789 c->cputype = CPU_4KSC;
790 __cpu_name[cpu] = "MIPS 4KSc";
791 break;
792 case PRID_IMP_5KC:
793 c->cputype = CPU_5KC;
794 __cpu_name[cpu] = "MIPS 5Kc";
795 break;
796 case PRID_IMP_20KC:
797 c->cputype = CPU_20KC;
798 __cpu_name[cpu] = "MIPS 20Kc";
799 break;
800 case PRID_IMP_24K:
801 case PRID_IMP_24KE:
802 c->cputype = CPU_24K;
803 __cpu_name[cpu] = "MIPS 24Kc";
804 break;
805 case PRID_IMP_25KF:
806 c->cputype = CPU_25KF;
807 __cpu_name[cpu] = "MIPS 25Kc";
808 break;
809 case PRID_IMP_34K:
810 c->cputype = CPU_34K;
811 __cpu_name[cpu] = "MIPS 34Kc";
812 break;
813 case PRID_IMP_74K:
814 c->cputype = CPU_74K;
815 __cpu_name[cpu] = "MIPS 74Kc";
816 break;
817 case PRID_IMP_1004K:
818 c->cputype = CPU_1004K;
819 __cpu_name[cpu] = "MIPS 1004Kc";
820 break;
821 }
822
823 spram_config();
824 }
825
826 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
827 {
828 decode_configs(c);
829 switch (c->processor_id & 0xff00) {
830 case PRID_IMP_AU1_REV1:
831 case PRID_IMP_AU1_REV2:
832 c->cputype = CPU_ALCHEMY;
833 switch ((c->processor_id >> 24) & 0xff) {
834 case 0:
835 __cpu_name[cpu] = "Au1000";
836 break;
837 case 1:
838 __cpu_name[cpu] = "Au1500";
839 break;
840 case 2:
841 __cpu_name[cpu] = "Au1100";
842 break;
843 case 3:
844 __cpu_name[cpu] = "Au1550";
845 break;
846 case 4:
847 __cpu_name[cpu] = "Au1200";
848 if ((c->processor_id & 0xff) == 2)
849 __cpu_name[cpu] = "Au1250";
850 break;
851 case 5:
852 __cpu_name[cpu] = "Au1210";
853 break;
854 default:
855 __cpu_name[cpu] = "Au1xxx";
856 break;
857 }
858 break;
859 }
860 }
861
862 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
863 {
864 decode_configs(c);
865
866 switch (c->processor_id & 0xff00) {
867 case PRID_IMP_SB1:
868 c->cputype = CPU_SB1;
869 __cpu_name[cpu] = "SiByte SB1";
870 /* FPU in pass1 is known to have issues. */
871 if ((c->processor_id & 0xff) < 0x02)
872 c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
873 break;
874 case PRID_IMP_SB1A:
875 c->cputype = CPU_SB1A;
876 __cpu_name[cpu] = "SiByte SB1A";
877 break;
878 }
879 }
880
881 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
882 {
883 decode_configs(c);
884 switch (c->processor_id & 0xff00) {
885 case PRID_IMP_SR71000:
886 c->cputype = CPU_SR71000;
887 __cpu_name[cpu] = "Sandcraft SR71000";
888 c->scache.ways = 8;
889 c->tlbsize = 64;
890 break;
891 }
892 }
893
894 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
895 {
896 decode_configs(c);
897 switch (c->processor_id & 0xff00) {
898 case PRID_IMP_PR4450:
899 c->cputype = CPU_PR4450;
900 __cpu_name[cpu] = "Philips PR4450";
901 c->isa_level = MIPS_CPU_ISA_M32R1;
902 break;
903 }
904 }
905
906 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
907 {
908 decode_configs(c);
909 switch (c->processor_id & 0xff00) {
910 case PRID_IMP_BMIPS32_REV4:
911 case PRID_IMP_BMIPS32_REV8:
912 c->cputype = CPU_BMIPS32;
913 __cpu_name[cpu] = "Broadcom BMIPS32";
914 break;
915 case PRID_IMP_BMIPS3300:
916 case PRID_IMP_BMIPS3300_ALT:
917 case PRID_IMP_BMIPS3300_BUG:
918 c->cputype = CPU_BMIPS3300;
919 __cpu_name[cpu] = "Broadcom BMIPS3300";
920 break;
921 case PRID_IMP_BMIPS43XX: {
922 int rev = c->processor_id & 0xff;
923
924 if (rev >= PRID_REV_BMIPS4380_LO &&
925 rev <= PRID_REV_BMIPS4380_HI) {
926 c->cputype = CPU_BMIPS4380;
927 __cpu_name[cpu] = "Broadcom BMIPS4380";
928 } else {
929 c->cputype = CPU_BMIPS4350;
930 __cpu_name[cpu] = "Broadcom BMIPS4350";
931 }
932 break;
933 }
934 case PRID_IMP_BMIPS5000:
935 c->cputype = CPU_BMIPS5000;
936 __cpu_name[cpu] = "Broadcom BMIPS5000";
937 c->options |= MIPS_CPU_ULRI;
938 break;
939 }
940 }
941
942 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
943 {
944 decode_configs(c);
945 switch (c->processor_id & 0xff00) {
946 case PRID_IMP_CAVIUM_CN38XX:
947 case PRID_IMP_CAVIUM_CN31XX:
948 case PRID_IMP_CAVIUM_CN30XX:
949 c->cputype = CPU_CAVIUM_OCTEON;
950 __cpu_name[cpu] = "Cavium Octeon";
951 goto platform;
952 case PRID_IMP_CAVIUM_CN58XX:
953 case PRID_IMP_CAVIUM_CN56XX:
954 case PRID_IMP_CAVIUM_CN50XX:
955 case PRID_IMP_CAVIUM_CN52XX:
956 c->cputype = CPU_CAVIUM_OCTEON_PLUS;
957 __cpu_name[cpu] = "Cavium Octeon+";
958 platform:
959 if (cpu == 0)
960 __elf_platform = "octeon";
961 break;
962 case PRID_IMP_CAVIUM_CN63XX:
963 c->cputype = CPU_CAVIUM_OCTEON2;
964 __cpu_name[cpu] = "Cavium Octeon II";
965 if (cpu == 0)
966 __elf_platform = "octeon2";
967 break;
968 default:
969 printk(KERN_INFO "Unknown Octeon chip!\n");
970 c->cputype = CPU_UNKNOWN;
971 break;
972 }
973 }
974
975 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
976 {
977 decode_configs(c);
978 /* JZRISC does not implement the CP0 counter. */
979 c->options &= ~MIPS_CPU_COUNTER;
980 switch (c->processor_id & 0xff00) {
981 case PRID_IMP_JZRISC:
982 c->cputype = CPU_JZRISC;
983 __cpu_name[cpu] = "Ingenic JZRISC";
984 break;
985 default:
986 panic("Unknown Ingenic Processor ID!");
987 break;
988 }
989 }
990
991 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
992 {
993 decode_configs(c);
994
995 c->options = (MIPS_CPU_TLB |
996 MIPS_CPU_4KEX |
997 MIPS_CPU_COUNTER |
998 MIPS_CPU_DIVEC |
999 MIPS_CPU_WATCH |
1000 MIPS_CPU_EJTAG |
1001 MIPS_CPU_LLSC);
1002
1003 switch (c->processor_id & 0xff00) {
1004 case PRID_IMP_NETLOGIC_XLR732:
1005 case PRID_IMP_NETLOGIC_XLR716:
1006 case PRID_IMP_NETLOGIC_XLR532:
1007 case PRID_IMP_NETLOGIC_XLR308:
1008 case PRID_IMP_NETLOGIC_XLR532C:
1009 case PRID_IMP_NETLOGIC_XLR516C:
1010 case PRID_IMP_NETLOGIC_XLR508C:
1011 case PRID_IMP_NETLOGIC_XLR308C:
1012 c->cputype = CPU_XLR;
1013 __cpu_name[cpu] = "Netlogic XLR";
1014 break;
1015
1016 case PRID_IMP_NETLOGIC_XLS608:
1017 case PRID_IMP_NETLOGIC_XLS408:
1018 case PRID_IMP_NETLOGIC_XLS404:
1019 case PRID_IMP_NETLOGIC_XLS208:
1020 case PRID_IMP_NETLOGIC_XLS204:
1021 case PRID_IMP_NETLOGIC_XLS108:
1022 case PRID_IMP_NETLOGIC_XLS104:
1023 case PRID_IMP_NETLOGIC_XLS616B:
1024 case PRID_IMP_NETLOGIC_XLS608B:
1025 case PRID_IMP_NETLOGIC_XLS416B:
1026 case PRID_IMP_NETLOGIC_XLS412B:
1027 case PRID_IMP_NETLOGIC_XLS408B:
1028 case PRID_IMP_NETLOGIC_XLS404B:
1029 c->cputype = CPU_XLR;
1030 __cpu_name[cpu] = "Netlogic XLS";
1031 break;
1032
1033 default:
1034 printk(KERN_INFO "Unknown Netlogic chip id [%02x]!\n",
1035 c->processor_id);
1036 c->cputype = CPU_XLR;
1037 break;
1038 }
1039
1040 c->isa_level = MIPS_CPU_ISA_M64R1;
1041 c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1042 }
1043
1044 #ifdef CONFIG_64BIT
1045 /* For use by uaccess.h */
1046 u64 __ua_limit;
1047 EXPORT_SYMBOL(__ua_limit);
1048 #endif
1049
1050 const char *__cpu_name[NR_CPUS];
1051 const char *__elf_platform;
1052
1053 __cpuinit void cpu_probe(void)
1054 {
1055 struct cpuinfo_mips *c = &current_cpu_data;
1056 unsigned int cpu = smp_processor_id();
1057
1058 c->processor_id = PRID_IMP_UNKNOWN;
1059 c->fpu_id = FPIR_IMP_NONE;
1060 c->cputype = CPU_UNKNOWN;
1061
1062 c->processor_id = read_c0_prid();
1063 switch (c->processor_id & 0xff0000) {
1064 case PRID_COMP_LEGACY:
1065 cpu_probe_legacy(c, cpu);
1066 break;
1067 case PRID_COMP_MIPS:
1068 cpu_probe_mips(c, cpu);
1069 break;
1070 case PRID_COMP_ALCHEMY:
1071 cpu_probe_alchemy(c, cpu);
1072 break;
1073 case PRID_COMP_SIBYTE:
1074 cpu_probe_sibyte(c, cpu);
1075 break;
1076 case PRID_COMP_BROADCOM:
1077 cpu_probe_broadcom(c, cpu);
1078 break;
1079 case PRID_COMP_SANDCRAFT:
1080 cpu_probe_sandcraft(c, cpu);
1081 break;
1082 case PRID_COMP_NXP:
1083 cpu_probe_nxp(c, cpu);
1084 break;
1085 case PRID_COMP_CAVIUM:
1086 cpu_probe_cavium(c, cpu);
1087 break;
1088 case PRID_COMP_INGENIC:
1089 cpu_probe_ingenic(c, cpu);
1090 break;
1091 case PRID_COMP_NETLOGIC:
1092 cpu_probe_netlogic(c, cpu);
1093 break;
1094 }
1095
1096 BUG_ON(!__cpu_name[cpu]);
1097 BUG_ON(c->cputype == CPU_UNKNOWN);
1098
1099 /*
1100 * Platform code can force the cpu type to optimize code
1101 * generation. In that case be sure the cpu type is correctly
1102 * manually setup otherwise it could trigger some nasty bugs.
1103 */
1104 BUG_ON(current_cpu_type() != c->cputype);
1105
1106 if (mips_fpu_disabled)
1107 c->options &= ~MIPS_CPU_FPU;
1108
1109 if (mips_dsp_disabled)
1110 c->ases &= ~MIPS_ASE_DSP;
1111
1112 if (c->options & MIPS_CPU_FPU) {
1113 c->fpu_id = cpu_get_fpu_id();
1114
1115 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1116 c->isa_level == MIPS_CPU_ISA_M32R2 ||
1117 c->isa_level == MIPS_CPU_ISA_M64R1 ||
1118 c->isa_level == MIPS_CPU_ISA_M64R2) {
1119 if (c->fpu_id & MIPS_FPIR_3D)
1120 c->ases |= MIPS_ASE_MIPS3D;
1121 }
1122 }
1123
1124 if (cpu_has_mips_r2)
1125 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1126 else
1127 c->srsets = 1;
1128
1129 cpu_probe_vmbits(c);
1130
1131 #ifdef CONFIG_64BIT
1132 if (cpu == 0)
1133 __ua_limit = ~((1ull << cpu_vmbits) - 1);
1134 #endif
1135 }
1136
1137 __cpuinit void cpu_report(void)
1138 {
1139 struct cpuinfo_mips *c = &current_cpu_data;
1140
1141 printk(KERN_INFO "CPU revision is: %08x (%s)\n",
1142 c->processor_id, cpu_name_string());
1143 if (c->options & MIPS_CPU_FPU)
1144 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1145 }
Mirror of the linux-mips.org kernel tree