Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / mips / kernel / cpu-probe.c
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/stddef.h>
18
19 #include <asm/bugs.h>
20 #include <asm/cpu.h>
21 #include <asm/fpu.h>
22 #include <asm/mipsregs.h>
23 #include <asm/system.h>
24 #include <asm/watch.h>
25
26 /*
27  * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
28  * the implementation of the "wait" feature differs between CPU families. This
29  * points to the function that implements CPU specific wait.
30  * The wait instruction stops the pipeline and reduces the power consumption of
31  * the CPU very much.
32  */
33 void (*cpu_wait)(void) = NULL;
34
35 static void r3081_wait(void)
36 {
37         unsigned long cfg = read_c0_conf();
38         write_c0_conf(cfg | R30XX_CONF_HALT);
39 }
40
41 static void r39xx_wait(void)
42 {
43         local_irq_disable();
44         if (!need_resched())
45                 write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
46         local_irq_enable();
47 }
48
49 extern void r4k_wait(void);
50
51 /*
52  * This variant is preferable as it allows testing need_resched and going to
53  * sleep depending on the outcome atomically.  Unfortunately the "It is
54  * implementation-dependent whether the pipeline restarts when a non-enabled
55  * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
56  * using this version a gamble.
57  */
58 void r4k_wait_irqoff(void)
59 {
60         local_irq_disable();
61         if (!need_resched())
62                 __asm__("       .set    push            \n"
63                         "       .set    mips3           \n"
64                         "       wait                    \n"
65                         "       .set    pop             \n");
66         local_irq_enable();
67         __asm__("       .globl __pastwait       \n"
68                 "__pastwait:                    \n");
69         return;
70 }
71
72 /*
73  * The RM7000 variant has to handle erratum 38.  The workaround is to not
74  * have any pending stores when the WAIT instruction is executed.
75  */
76 static void rm7k_wait_irqoff(void)
77 {
78         local_irq_disable();
79         if (!need_resched())
80                 __asm__(
81                 "       .set    push                                    \n"
82                 "       .set    mips3                                   \n"
83                 "       .set    noat                                    \n"
84                 "       mfc0    $1, $12                                 \n"
85                 "       sync                                            \n"
86                 "       mtc0    $1, $12         # stalls until W stage  \n"
87                 "       wait                                            \n"
88                 "       mtc0    $1, $12         # stalls until W stage  \n"
89                 "       .set    pop                                     \n");
90         local_irq_enable();
91 }
92
93 /* The Au1xxx wait is available only if using 32khz counter or
94  * external timer source, but specifically not CP0 Counter. */
95 int allow_au1k_wait;
96
97 static void au1k_wait(void)
98 {
99         if (!allow_au1k_wait)
100                 return;
101
102         /* using the wait instruction makes CP0 counter unusable */
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"
114                 : : "r" (au1k_wait));
115 }
116
117 static int __initdata nowait = 0;
118
119 static int __init wait_disable(char *s)
120 {
121         nowait = 1;
122
123         return 1;
124 }
125
126 __setup("nowait", wait_disable);
127
128 void __init check_wait(void)
129 {
130         struct cpuinfo_mips *c = &current_cpu_data;
131
132         if (nowait) {
133                 printk("Wait instruction disabled.\n");
134                 return;
135         }
136
137         switch (c->cputype) {
138         case CPU_R3081:
139         case CPU_R3081E:
140                 cpu_wait = r3081_wait;
141                 break;
142         case CPU_TX3927:
143                 cpu_wait = r39xx_wait;
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:
152         case CPU_NEVADA:
153         case CPU_4KC:
154         case CPU_4KEC:
155         case CPU_4KSC:
156         case CPU_5KC:
157         case CPU_25KF:
158         case CPU_PR4450:
159         case CPU_BCM3302:
160         case CPU_CAVIUM_OCTEON:
161                 cpu_wait = r4k_wait;
162                 break;
163
164         case CPU_RM7000:
165                 cpu_wait = rm7k_wait_irqoff;
166                 break;
167
168         case CPU_24K:
169         case CPU_34K:
170         case CPU_1004K:
171                 cpu_wait = r4k_wait;
172                 if (read_c0_config7() & MIPS_CONF7_WII)
173                         cpu_wait = r4k_wait_irqoff;
174                 break;
175
176         case CPU_74K:
177                 cpu_wait = r4k_wait;
178                 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
179                         cpu_wait = r4k_wait_irqoff;
180                 break;
181
182         case CPU_TX49XX:
183                 cpu_wait = r4k_wait_irqoff;
184                 break;
185         case CPU_AU1000:
186         case CPU_AU1100:
187         case CPU_AU1500:
188         case CPU_AU1550:
189         case CPU_AU1200:
190         case CPU_AU1210:
191         case CPU_AU1250:
192                 cpu_wait = au1k_wait;
193                 break;
194         case CPU_20KC:
195                 /*
196                  * WAIT on Rev1.0 has E1, E2, E3 and E16.
197                  * WAIT on Rev2.0 and Rev3.0 has E16.
198                  * Rev3.1 WAIT is nop, why bother
199                  */
200                 if ((c->processor_id & 0xff) <= 0x64)
201                         break;
202
203                 /*
204                  * Another rev is incremeting c0_count at a reduced clock
205                  * rate while in WAIT mode.  So we basically have the choice
206                  * between using the cp0 timer as clocksource or avoiding
207                  * the WAIT instruction.  Until more details are known,
208                  * disable the use of WAIT for 20Kc entirely.
209                    cpu_wait = r4k_wait;
210                  */
211                 break;
212         case CPU_RM9000:
213                 if ((c->processor_id & 0x00ff) >= 0x40)
214                         cpu_wait = r4k_wait;
215                 break;
216         default:
217                 break;
218         }
219 }
220
221 static inline void check_errata(void)
222 {
223         struct cpuinfo_mips *c = &current_cpu_data;
224
225         switch (c->cputype) {
226         case CPU_34K:
227                 /*
228                  * Erratum "RPS May Cause Incorrect Instruction Execution"
229                  * This code only handles VPE0, any SMP/SMTC/RTOS code
230                  * making use of VPE1 will be responsable for that VPE.
231                  */
232                 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
233                         write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
234                 break;
235         default:
236                 break;
237         }
238 }
239
240 void __init check_bugs32(void)
241 {
242         check_errata();
243 }
244
245 /*
246  * Probe whether cpu has config register by trying to play with
247  * alternate cache bit and see whether it matters.
248  * It's used by cpu_probe to distinguish between R3000A and R3081.
249  */
250 static inline int cpu_has_confreg(void)
251 {
252 #ifdef CONFIG_CPU_R3000
253         extern unsigned long r3k_cache_size(unsigned long);
254         unsigned long size1, size2;
255         unsigned long cfg = read_c0_conf();
256
257         size1 = r3k_cache_size(ST0_ISC);
258         write_c0_conf(cfg ^ R30XX_CONF_AC);
259         size2 = r3k_cache_size(ST0_ISC);
260         write_c0_conf(cfg);
261         return size1 != size2;
262 #else
263         return 0;
264 #endif
265 }
266
267 /*
268  * Get the FPU Implementation/Revision.
269  */
270 static inline unsigned long cpu_get_fpu_id(void)
271 {
272         unsigned long tmp, fpu_id;
273
274         tmp = read_c0_status();
275         __enable_fpu();
276         fpu_id = read_32bit_cp1_register(CP1_REVISION);
277         write_c0_status(tmp);
278         return fpu_id;
279 }
280
281 /*
282  * Check the CPU has an FPU the official way.
283  */
284 static inline int __cpu_has_fpu(void)
285 {
286         return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
287 }
288
289 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
290                 | MIPS_CPU_COUNTER)
291
292 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
293 {
294         switch (c->processor_id & 0xff00) {
295         case PRID_IMP_R2000:
296                 c->cputype = CPU_R2000;
297                 __cpu_name[cpu] = "R2000";
298                 c->isa_level = MIPS_CPU_ISA_I;
299                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
300                              MIPS_CPU_NOFPUEX;
301                 if (__cpu_has_fpu())
302                         c->options |= MIPS_CPU_FPU;
303                 c->tlbsize = 64;
304                 break;
305         case PRID_IMP_R3000:
306                 if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
307                         if (cpu_has_confreg()) {
308                                 c->cputype = CPU_R3081E;
309                                 __cpu_name[cpu] = "R3081";
310                         } else {
311                                 c->cputype = CPU_R3000A;
312                                 __cpu_name[cpu] = "R3000A";
313                         }
314                         break;
315                 } else {
316                         c->cputype = CPU_R3000;
317                         __cpu_name[cpu] = "R3000";
318                 }
319                 c->isa_level = MIPS_CPU_ISA_I;
320                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
321                              MIPS_CPU_NOFPUEX;
322                 if (__cpu_has_fpu())
323                         c->options |= MIPS_CPU_FPU;
324                 c->tlbsize = 64;
325                 break;
326         case PRID_IMP_R4000:
327                 if (read_c0_config() & CONF_SC) {
328                         if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
329                                 c->cputype = CPU_R4400PC;
330                                 __cpu_name[cpu] = "R4400PC";
331                         } else {
332                                 c->cputype = CPU_R4000PC;
333                                 __cpu_name[cpu] = "R4000PC";
334                         }
335                 } else {
336                         if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
337                                 c->cputype = CPU_R4400SC;
338                                 __cpu_name[cpu] = "R4400SC";
339                         } else {
340                                 c->cputype = CPU_R4000SC;
341                                 __cpu_name[cpu] = "R4000SC";
342                         }
343                 }
344
345                 c->isa_level = MIPS_CPU_ISA_III;
346                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
347                              MIPS_CPU_WATCH | MIPS_CPU_VCE |
348                              MIPS_CPU_LLSC;
349                 c->tlbsize = 48;
350                 break;
351         case PRID_IMP_VR41XX:
352                 switch (c->processor_id & 0xf0) {
353                 case PRID_REV_VR4111:
354                         c->cputype = CPU_VR4111;
355                         __cpu_name[cpu] = "NEC VR4111";
356                         break;
357                 case PRID_REV_VR4121:
358                         c->cputype = CPU_VR4121;
359                         __cpu_name[cpu] = "NEC VR4121";
360                         break;
361                 case PRID_REV_VR4122:
362                         if ((c->processor_id & 0xf) < 0x3) {
363                                 c->cputype = CPU_VR4122;
364                                 __cpu_name[cpu] = "NEC VR4122";
365                         } else {
366                                 c->cputype = CPU_VR4181A;
367                                 __cpu_name[cpu] = "NEC VR4181A";
368                         }
369                         break;
370                 case PRID_REV_VR4130:
371                         if ((c->processor_id & 0xf) < 0x4) {
372                                 c->cputype = CPU_VR4131;
373                                 __cpu_name[cpu] = "NEC VR4131";
374                         } else {
375                                 c->cputype = CPU_VR4133;
376                                 __cpu_name[cpu] = "NEC VR4133";
377                         }
378                         break;
379                 default:
380                         printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
381                         c->cputype = CPU_VR41XX;
382                         __cpu_name[cpu] = "NEC Vr41xx";
383                         break;
384                 }
385                 c->isa_level = MIPS_CPU_ISA_III;
386                 c->options = R4K_OPTS;
387                 c->tlbsize = 32;
388                 break;
389         case PRID_IMP_R4300:
390                 c->cputype = CPU_R4300;
391                 __cpu_name[cpu] = "R4300";
392                 c->isa_level = MIPS_CPU_ISA_III;
393                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
394                              MIPS_CPU_LLSC;
395                 c->tlbsize = 32;
396                 break;
397         case PRID_IMP_R4600:
398                 c->cputype = CPU_R4600;
399                 __cpu_name[cpu] = "R4600";
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 = 48;
404                 break;
405         #if 0
406         case PRID_IMP_R4650:
407                 /*
408                  * This processor doesn't have an MMU, so it's not
409                  * "real easy" to run Linux on it. It is left purely
410                  * for documentation.  Commented out because it shares
411                  * it's c0_prid id number with the TX3900.
412                  */
413                 c->cputype = CPU_R4650;
414                 __cpu_name[cpu] = "R4650";
415                 c->isa_level = MIPS_CPU_ISA_III;
416                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
417                 c->tlbsize = 48;
418                 break;
419         #endif
420         case PRID_IMP_TX39:
421                 c->isa_level = MIPS_CPU_ISA_I;
422                 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
423
424                 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
425                         c->cputype = CPU_TX3927;
426                         __cpu_name[cpu] = "TX3927";
427                         c->tlbsize = 64;
428                 } else {
429                         switch (c->processor_id & 0xff) {
430                         case PRID_REV_TX3912:
431                                 c->cputype = CPU_TX3912;
432                                 __cpu_name[cpu] = "TX3912";
433                                 c->tlbsize = 32;
434                                 break;
435                         case PRID_REV_TX3922:
436                                 c->cputype = CPU_TX3922;
437                                 __cpu_name[cpu] = "TX3922";
438                                 c->tlbsize = 64;
439                                 break;
440                         }
441                 }
442                 break;
443         case PRID_IMP_R4700:
444                 c->cputype = CPU_R4700;
445                 __cpu_name[cpu] = "R4700";
446                 c->isa_level = MIPS_CPU_ISA_III;
447                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
448                              MIPS_CPU_LLSC;
449                 c->tlbsize = 48;
450                 break;
451         case PRID_IMP_TX49:
452                 c->cputype = CPU_TX49XX;
453                 __cpu_name[cpu] = "R49XX";
454                 c->isa_level = MIPS_CPU_ISA_III;
455                 c->options = R4K_OPTS | MIPS_CPU_LLSC;
456                 if (!(c->processor_id & 0x08))
457                         c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
458                 c->tlbsize = 48;
459                 break;
460         case PRID_IMP_R5000:
461                 c->cputype = CPU_R5000;
462                 __cpu_name[cpu] = "R5000";
463                 c->isa_level = MIPS_CPU_ISA_IV;
464                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
465                              MIPS_CPU_LLSC;
466                 c->tlbsize = 48;
467                 break;
468         case PRID_IMP_R5432:
469                 c->cputype = CPU_R5432;
470                 __cpu_name[cpu] = "R5432";
471                 c->isa_level = MIPS_CPU_ISA_IV;
472                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
473                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
474                 c->tlbsize = 48;
475                 break;
476         case PRID_IMP_R5500:
477                 c->cputype = CPU_R5500;
478                 __cpu_name[cpu] = "R5500";
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_NEVADA:
485                 c->cputype = CPU_NEVADA;
486                 __cpu_name[cpu] = "Nevada";
487                 c->isa_level = MIPS_CPU_ISA_IV;
488                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
489                              MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
490                 c->tlbsize = 48;
491                 break;
492         case PRID_IMP_R6000:
493                 c->cputype = CPU_R6000;
494                 __cpu_name[cpu] = "R6000";
495                 c->isa_level = MIPS_CPU_ISA_II;
496                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
497                              MIPS_CPU_LLSC;
498                 c->tlbsize = 32;
499                 break;
500         case PRID_IMP_R6000A:
501                 c->cputype = CPU_R6000A;
502                 __cpu_name[cpu] = "R6000A";
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_RM7000:
509                 c->cputype = CPU_RM7000;
510                 __cpu_name[cpu] = "RM7000";
511                 c->isa_level = MIPS_CPU_ISA_IV;
512                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
513                              MIPS_CPU_LLSC;
514                 /*
515                  * Undocumented RM7000:  Bit 29 in the info register of
516                  * the RM7000 v2.0 indicates if the TLB has 48 or 64
517                  * entries.
518                  *
519                  * 29      1 =>    64 entry JTLB
520                  *         0 =>    48 entry JTLB
521                  */
522                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
523                 break;
524         case PRID_IMP_RM9000:
525                 c->cputype = CPU_RM9000;
526                 __cpu_name[cpu] = "RM9000";
527                 c->isa_level = MIPS_CPU_ISA_IV;
528                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
529                              MIPS_CPU_LLSC;
530                 /*
531                  * Bit 29 in the info register of the RM9000
532                  * indicates if the TLB has 48 or 64 entries.
533                  *
534                  * 29      1 =>    64 entry JTLB
535                  *         0 =>    48 entry JTLB
536                  */
537                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
538                 break;
539         case PRID_IMP_R8000:
540                 c->cputype = CPU_R8000;
541                 __cpu_name[cpu] = "RM8000";
542                 c->isa_level = MIPS_CPU_ISA_IV;
543                 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
544                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
545                              MIPS_CPU_LLSC;
546                 c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
547                 break;
548         case PRID_IMP_R10000:
549                 c->cputype = CPU_R10000;
550                 __cpu_name[cpu] = "R10000";
551                 c->isa_level = MIPS_CPU_ISA_IV;
552                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
553                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
554                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
555                              MIPS_CPU_LLSC;
556                 c->tlbsize = 64;
557                 break;
558         case PRID_IMP_R12000:
559                 c->cputype = CPU_R12000;
560                 __cpu_name[cpu] = "R12000";
561                 c->isa_level = MIPS_CPU_ISA_IV;
562                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
563                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
564                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
565                              MIPS_CPU_LLSC;
566                 c->tlbsize = 64;
567                 break;
568         case PRID_IMP_R14000:
569                 c->cputype = CPU_R14000;
570                 __cpu_name[cpu] = "R14000";
571                 c->isa_level = MIPS_CPU_ISA_IV;
572                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
573                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
574                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
575                              MIPS_CPU_LLSC;
576                 c->tlbsize = 64;
577                 break;
578         case PRID_IMP_LOONGSON2:
579                 c->cputype = CPU_LOONGSON2;
580                 __cpu_name[cpu] = "ICT Loongson-2";
581                 c->isa_level = MIPS_CPU_ISA_III;
582                 c->options = R4K_OPTS |
583                              MIPS_CPU_FPU | MIPS_CPU_LLSC |
584                              MIPS_CPU_32FPR;
585                 c->tlbsize = 64;
586                 break;
587         }
588 }
589
590 static char unknown_isa[] __cpuinitdata = KERN_ERR \
591         "Unsupported ISA type, c0.config0: %d.";
592
593 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
594 {
595         unsigned int config0;
596         int isa;
597
598         config0 = read_c0_config();
599
600         if (((config0 & MIPS_CONF_MT) >> 7) == 1)
601                 c->options |= MIPS_CPU_TLB;
602         isa = (config0 & MIPS_CONF_AT) >> 13;
603         switch (isa) {
604         case 0:
605                 switch ((config0 & MIPS_CONF_AR) >> 10) {
606                 case 0:
607                         c->isa_level = MIPS_CPU_ISA_M32R1;
608                         break;
609                 case 1:
610                         c->isa_level = MIPS_CPU_ISA_M32R2;
611                         break;
612                 default:
613                         goto unknown;
614                 }
615                 break;
616         case 2:
617                 switch ((config0 & MIPS_CONF_AR) >> 10) {
618                 case 0:
619                         c->isa_level = MIPS_CPU_ISA_M64R1;
620                         break;
621                 case 1:
622                         c->isa_level = MIPS_CPU_ISA_M64R2;
623                         break;
624                 default:
625                         goto unknown;
626                 }
627                 break;
628         default:
629                 goto unknown;
630         }
631
632         return config0 & MIPS_CONF_M;
633
634 unknown:
635         panic(unknown_isa, config0);
636 }
637
638 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
639 {
640         unsigned int config1;
641
642         config1 = read_c0_config1();
643
644         if (config1 & MIPS_CONF1_MD)
645                 c->ases |= MIPS_ASE_MDMX;
646         if (config1 & MIPS_CONF1_WR)
647                 c->options |= MIPS_CPU_WATCH;
648         if (config1 & MIPS_CONF1_CA)
649                 c->ases |= MIPS_ASE_MIPS16;
650         if (config1 & MIPS_CONF1_EP)
651                 c->options |= MIPS_CPU_EJTAG;
652         if (config1 & MIPS_CONF1_FP) {
653                 c->options |= MIPS_CPU_FPU;
654                 c->options |= MIPS_CPU_32FPR;
655         }
656         if (cpu_has_tlb)
657                 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
658
659         return config1 & MIPS_CONF_M;
660 }
661
662 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
663 {
664         unsigned int config2;
665
666         config2 = read_c0_config2();
667
668         if (config2 & MIPS_CONF2_SL)
669                 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
670
671         return config2 & MIPS_CONF_M;
672 }
673
674 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
675 {
676         unsigned int config3;
677
678         config3 = read_c0_config3();
679
680         if (config3 & MIPS_CONF3_SM)
681                 c->ases |= MIPS_ASE_SMARTMIPS;
682         if (config3 & MIPS_CONF3_DSP)
683                 c->ases |= MIPS_ASE_DSP;
684         if (config3 & MIPS_CONF3_VINT)
685                 c->options |= MIPS_CPU_VINT;
686         if (config3 & MIPS_CONF3_VEIC)
687                 c->options |= MIPS_CPU_VEIC;
688         if (config3 & MIPS_CONF3_MT)
689                 c->ases |= MIPS_ASE_MIPSMT;
690         if (config3 & MIPS_CONF3_ULRI)
691                 c->options |= MIPS_CPU_ULRI;
692
693         return config3 & MIPS_CONF_M;
694 }
695
696 static void __cpuinit decode_configs(struct cpuinfo_mips *c)
697 {
698         int ok;
699
700         /* MIPS32 or MIPS64 compliant CPU.  */
701         c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
702                      MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
703
704         c->scache.flags = MIPS_CACHE_NOT_PRESENT;
705
706         ok = decode_config0(c);                 /* Read Config registers.  */
707         BUG_ON(!ok);                            /* Arch spec violation!  */
708         if (ok)
709                 ok = decode_config1(c);
710         if (ok)
711                 ok = decode_config2(c);
712         if (ok)
713                 ok = decode_config3(c);
714
715         mips_probe_watch_registers(c);
716 }
717
718 #ifdef CONFIG_CPU_MIPSR2
719 extern void spram_config(void);
720 #else
721 static inline void spram_config(void) {}
722 #endif
723
724 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
725 {
726         decode_configs(c);
727         switch (c->processor_id & 0xff00) {
728         case PRID_IMP_4KC:
729                 c->cputype = CPU_4KC;
730                 __cpu_name[cpu] = "MIPS 4Kc";
731                 break;
732         case PRID_IMP_4KEC:
733                 c->cputype = CPU_4KEC;
734                 __cpu_name[cpu] = "MIPS 4KEc";
735                 break;
736         case PRID_IMP_4KECR2:
737                 c->cputype = CPU_4KEC;
738                 __cpu_name[cpu] = "MIPS 4KEc";
739                 break;
740         case PRID_IMP_4KSC:
741         case PRID_IMP_4KSD:
742                 c->cputype = CPU_4KSC;
743                 __cpu_name[cpu] = "MIPS 4KSc";
744                 break;
745         case PRID_IMP_5KC:
746                 c->cputype = CPU_5KC;
747                 __cpu_name[cpu] = "MIPS 5Kc";
748                 break;
749         case PRID_IMP_20KC:
750                 c->cputype = CPU_20KC;
751                 __cpu_name[cpu] = "MIPS 20Kc";
752                 break;
753         case PRID_IMP_24K:
754         case PRID_IMP_24KE:
755                 c->cputype = CPU_24K;
756                 __cpu_name[cpu] = "MIPS 24Kc";
757                 break;
758         case PRID_IMP_25KF:
759                 c->cputype = CPU_25KF;
760                 __cpu_name[cpu] = "MIPS 25Kc";
761                 break;
762         case PRID_IMP_34K:
763                 c->cputype = CPU_34K;
764                 __cpu_name[cpu] = "MIPS 34Kc";
765                 break;
766         case PRID_IMP_74K:
767                 c->cputype = CPU_74K;
768                 __cpu_name[cpu] = "MIPS 74Kc";
769                 break;
770         case PRID_IMP_1004K:
771                 c->cputype = CPU_1004K;
772                 __cpu_name[cpu] = "MIPS 1004Kc";
773                 break;
774         }
775
776         spram_config();
777 }
778
779 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
780 {
781         decode_configs(c);
782         switch (c->processor_id & 0xff00) {
783         case PRID_IMP_AU1_REV1:
784         case PRID_IMP_AU1_REV2:
785                 switch ((c->processor_id >> 24) & 0xff) {
786                 case 0:
787                         c->cputype = CPU_AU1000;
788                         __cpu_name[cpu] = "Au1000";
789                         break;
790                 case 1:
791                         c->cputype = CPU_AU1500;
792                         __cpu_name[cpu] = "Au1500";
793                         break;
794                 case 2:
795                         c->cputype = CPU_AU1100;
796                         __cpu_name[cpu] = "Au1100";
797                         break;
798                 case 3:
799                         c->cputype = CPU_AU1550;
800                         __cpu_name[cpu] = "Au1550";
801                         break;
802                 case 4:
803                         c->cputype = CPU_AU1200;
804                         __cpu_name[cpu] = "Au1200";
805                         if ((c->processor_id & 0xff) == 2) {
806                                 c->cputype = CPU_AU1250;
807                                 __cpu_name[cpu] = "Au1250";
808                         }
809                         break;
810                 case 5:
811                         c->cputype = CPU_AU1210;
812                         __cpu_name[cpu] = "Au1210";
813                         break;
814                 default:
815                         panic("Unknown Au Core!");
816                         break;
817                 }
818                 break;
819         }
820 }
821
822 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
823 {
824         decode_configs(c);
825
826         switch (c->processor_id & 0xff00) {
827         case PRID_IMP_SB1:
828                 c->cputype = CPU_SB1;
829                 __cpu_name[cpu] = "SiByte SB1";
830                 /* FPU in pass1 is known to have issues. */
831                 if ((c->processor_id & 0xff) < 0x02)
832                         c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
833                 break;
834         case PRID_IMP_SB1A:
835                 c->cputype = CPU_SB1A;
836                 __cpu_name[cpu] = "SiByte SB1A";
837                 break;
838         }
839 }
840
841 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
842 {
843         decode_configs(c);
844         switch (c->processor_id & 0xff00) {
845         case PRID_IMP_SR71000:
846                 c->cputype = CPU_SR71000;
847                 __cpu_name[cpu] = "Sandcraft SR71000";
848                 c->scache.ways = 8;
849                 c->tlbsize = 64;
850                 break;
851         }
852 }
853
854 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
855 {
856         decode_configs(c);
857         switch (c->processor_id & 0xff00) {
858         case PRID_IMP_PR4450:
859                 c->cputype = CPU_PR4450;
860                 __cpu_name[cpu] = "Philips PR4450";
861                 c->isa_level = MIPS_CPU_ISA_M32R1;
862                 break;
863         }
864 }
865
866 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
867 {
868         decode_configs(c);
869         switch (c->processor_id & 0xff00) {
870         case PRID_IMP_BCM3302:
871                 c->cputype = CPU_BCM3302;
872                 __cpu_name[cpu] = "Broadcom BCM3302";
873                 break;
874         case PRID_IMP_BCM4710:
875                 c->cputype = CPU_BCM4710;
876                 __cpu_name[cpu] = "Broadcom BCM4710";
877                 break;
878         }
879 }
880
881 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
882 {
883         decode_configs(c);
884         switch (c->processor_id & 0xff00) {
885         case PRID_IMP_CAVIUM_CN38XX:
886         case PRID_IMP_CAVIUM_CN31XX:
887         case PRID_IMP_CAVIUM_CN30XX:
888         case PRID_IMP_CAVIUM_CN58XX:
889         case PRID_IMP_CAVIUM_CN56XX:
890         case PRID_IMP_CAVIUM_CN50XX:
891         case PRID_IMP_CAVIUM_CN52XX:
892                 c->cputype = CPU_CAVIUM_OCTEON;
893                 __cpu_name[cpu] = "Cavium Octeon";
894                 break;
895         default:
896                 printk(KERN_INFO "Unknown Octeon chip!\n");
897                 c->cputype = CPU_UNKNOWN;
898                 break;
899         }
900 }
901
902 const char *__cpu_name[NR_CPUS];
903
904 __cpuinit void cpu_probe(void)
905 {
906         struct cpuinfo_mips *c = &current_cpu_data;
907         unsigned int cpu = smp_processor_id();
908
909         c->processor_id = PRID_IMP_UNKNOWN;
910         c->fpu_id       = FPIR_IMP_NONE;
911         c->cputype      = CPU_UNKNOWN;
912
913         c->processor_id = read_c0_prid();
914         switch (c->processor_id & 0xff0000) {
915         case PRID_COMP_LEGACY:
916                 cpu_probe_legacy(c, cpu);
917                 break;
918         case PRID_COMP_MIPS:
919                 cpu_probe_mips(c, cpu);
920                 break;
921         case PRID_COMP_ALCHEMY:
922                 cpu_probe_alchemy(c, cpu);
923                 break;
924         case PRID_COMP_SIBYTE:
925                 cpu_probe_sibyte(c, cpu);
926                 break;
927         case PRID_COMP_BROADCOM:
928                 cpu_probe_broadcom(c, cpu);
929                 break;
930         case PRID_COMP_SANDCRAFT:
931                 cpu_probe_sandcraft(c, cpu);
932                 break;
933         case PRID_COMP_NXP:
934                 cpu_probe_nxp(c, cpu);
935                 break;
936         case PRID_COMP_CAVIUM:
937                 cpu_probe_cavium(c, cpu);
938                 break;
939         }
940
941         BUG_ON(!__cpu_name[cpu]);
942         BUG_ON(c->cputype == CPU_UNKNOWN);
943
944         /*
945          * Platform code can force the cpu type to optimize code
946          * generation. In that case be sure the cpu type is correctly
947          * manually setup otherwise it could trigger some nasty bugs.
948          */
949         BUG_ON(current_cpu_type() != c->cputype);
950
951         if (c->options & MIPS_CPU_FPU) {
952                 c->fpu_id = cpu_get_fpu_id();
953
954                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
955                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
956                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
957                     c->isa_level == MIPS_CPU_ISA_M64R2) {
958                         if (c->fpu_id & MIPS_FPIR_3D)
959                                 c->ases |= MIPS_ASE_MIPS3D;
960                 }
961         }
962
963         if (cpu_has_mips_r2)
964                 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
965         else
966                 c->srsets = 1;
967 }
968
969 __cpuinit void cpu_report(void)
970 {
971         struct cpuinfo_mips *c = &current_cpu_data;
972
973         printk(KERN_INFO "CPU revision is: %08x (%s)\n",
974                c->processor_id, cpu_name_string());
975         if (c->options & MIPS_CPU_FPU)
976                 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
977 }