Commit | Line | Data |
---|---|---|
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> | |
17 | #include <linux/stddef.h> | |
18 | ||
5759906c | 19 | #include <asm/bugs.h> |
1da177e4 LT |
20 | #include <asm/cpu.h> |
21 | #include <asm/fpu.h> | |
22 | #include <asm/mipsregs.h> | |
23 | #include <asm/system.h> | |
24 | ||
25 | /* | |
26 | * Not all of the MIPS CPUs have the "wait" instruction available. Moreover, | |
27 | * the implementation of the "wait" feature differs between CPU families. This | |
28 | * points to the function that implements CPU specific wait. | |
29 | * The wait instruction stops the pipeline and reduces the power consumption of | |
30 | * the CPU very much. | |
31 | */ | |
32 | void (*cpu_wait)(void) = NULL; | |
33 | ||
34 | static void r3081_wait(void) | |
35 | { | |
36 | unsigned long cfg = read_c0_conf(); | |
37 | write_c0_conf(cfg | R30XX_CONF_HALT); | |
38 | } | |
39 | ||
40 | static void r39xx_wait(void) | |
41 | { | |
60a6c377 AN |
42 | local_irq_disable(); |
43 | if (!need_resched()) | |
44 | write_c0_conf(read_c0_conf() | TX39_CONF_HALT); | |
45 | local_irq_enable(); | |
1da177e4 LT |
46 | } |
47 | ||
60a6c377 AN |
48 | /* |
49 | * There is a race when WAIT instruction executed with interrupt | |
50 | * enabled. | |
51 | * But it is implementation-dependent wheter the pipelie restarts when | |
52 | * a non-enabled interrupt is requested. | |
53 | */ | |
1da177e4 LT |
54 | static void r4k_wait(void) |
55 | { | |
60a6c377 AN |
56 | __asm__(" .set mips3 \n" |
57 | " wait \n" | |
58 | " .set mips0 \n"); | |
59 | } | |
60 | ||
61 | /* | |
62 | * This variant is preferable as it allows testing need_resched and going to | |
63 | * sleep depending on the outcome atomically. Unfortunately the "It is | |
64 | * implementation-dependent whether the pipeline restarts when a non-enabled | |
65 | * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes | |
66 | * using this version a gamble. | |
67 | */ | |
68 | static void r4k_wait_irqoff(void) | |
69 | { | |
70 | local_irq_disable(); | |
71 | if (!need_resched()) | |
72 | __asm__(" .set mips3 \n" | |
73 | " wait \n" | |
74 | " .set mips0 \n"); | |
75 | local_irq_enable(); | |
1da177e4 LT |
76 | } |
77 | ||
494900af PP |
78 | /* The Au1xxx wait is available only if using 32khz counter or |
79 | * external timer source, but specifically not CP0 Counter. */ | |
fe359bf5 | 80 | int allow_au1k_wait; |
10f650db | 81 | |
494900af | 82 | static void au1k_wait(void) |
1da177e4 | 83 | { |
1da177e4 | 84 | /* using the wait instruction makes CP0 counter unusable */ |
60a6c377 AN |
85 | __asm__(" .set mips3 \n" |
86 | " cache 0x14, 0(%0) \n" | |
87 | " cache 0x14, 32(%0) \n" | |
88 | " sync \n" | |
89 | " nop \n" | |
90 | " wait \n" | |
91 | " nop \n" | |
92 | " nop \n" | |
93 | " nop \n" | |
94 | " nop \n" | |
95 | " .set mips0 \n" | |
10f650db | 96 | : : "r" (au1k_wait)); |
1da177e4 LT |
97 | } |
98 | ||
55d04dff RB |
99 | static int __initdata nowait = 0; |
100 | ||
f49a747c | 101 | static int __init wait_disable(char *s) |
55d04dff RB |
102 | { |
103 | nowait = 1; | |
104 | ||
105 | return 1; | |
106 | } | |
107 | ||
108 | __setup("nowait", wait_disable); | |
109 | ||
1da177e4 LT |
110 | static inline void check_wait(void) |
111 | { | |
112 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
113 | ||
55d04dff | 114 | if (nowait) { |
c2379230 | 115 | printk("Wait instruction disabled.\n"); |
55d04dff RB |
116 | return; |
117 | } | |
118 | ||
1da177e4 LT |
119 | switch (c->cputype) { |
120 | case CPU_R3081: | |
121 | case CPU_R3081E: | |
122 | cpu_wait = r3081_wait; | |
1da177e4 LT |
123 | break; |
124 | case CPU_TX3927: | |
125 | cpu_wait = r39xx_wait; | |
1da177e4 LT |
126 | break; |
127 | case CPU_R4200: | |
128 | /* case CPU_R4300: */ | |
129 | case CPU_R4600: | |
130 | case CPU_R4640: | |
131 | case CPU_R4650: | |
132 | case CPU_R4700: | |
133 | case CPU_R5000: | |
134 | case CPU_NEVADA: | |
135 | case CPU_RM7000: | |
1da177e4 LT |
136 | case CPU_4KC: |
137 | case CPU_4KEC: | |
138 | case CPU_4KSC: | |
139 | case CPU_5KC: | |
1da177e4 | 140 | case CPU_25KF: |
4b3e975e RB |
141 | case CPU_PR4450: |
142 | cpu_wait = r4k_wait; | |
143 | break; | |
144 | ||
145 | case CPU_24K: | |
bbc7f22f | 146 | case CPU_34K: |
4b3e975e RB |
147 | cpu_wait = r4k_wait; |
148 | if (read_c0_config7() & MIPS_CONF7_WII) | |
149 | cpu_wait = r4k_wait_irqoff; | |
150 | break; | |
151 | ||
c620953c | 152 | case CPU_74K: |
1da177e4 | 153 | cpu_wait = r4k_wait; |
4b3e975e RB |
154 | if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0)) |
155 | cpu_wait = r4k_wait_irqoff; | |
1da177e4 | 156 | break; |
4b3e975e | 157 | |
60a6c377 AN |
158 | case CPU_TX49XX: |
159 | cpu_wait = r4k_wait_irqoff; | |
60a6c377 | 160 | break; |
1da177e4 LT |
161 | case CPU_AU1000: |
162 | case CPU_AU1100: | |
163 | case CPU_AU1500: | |
e3ad1c23 PP |
164 | case CPU_AU1550: |
165 | case CPU_AU1200: | |
c2379230 | 166 | if (allow_au1k_wait) |
fe359bf5 | 167 | cpu_wait = au1k_wait; |
1da177e4 | 168 | break; |
c8eae71d RB |
169 | case CPU_20KC: |
170 | /* | |
171 | * WAIT on Rev1.0 has E1, E2, E3 and E16. | |
172 | * WAIT on Rev2.0 and Rev3.0 has E16. | |
173 | * Rev3.1 WAIT is nop, why bother | |
174 | */ | |
175 | if ((c->processor_id & 0xff) <= 0x64) | |
176 | break; | |
177 | ||
178 | cpu_wait = r4k_wait; | |
179 | break; | |
441ee341 | 180 | case CPU_RM9000: |
c2379230 | 181 | if ((c->processor_id & 0x00ff) >= 0x40) |
441ee341 | 182 | cpu_wait = r4k_wait; |
441ee341 | 183 | break; |
1da177e4 | 184 | default: |
1da177e4 LT |
185 | break; |
186 | } | |
187 | } | |
188 | ||
189 | void __init check_bugs32(void) | |
190 | { | |
191 | check_wait(); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Probe whether cpu has config register by trying to play with | |
196 | * alternate cache bit and see whether it matters. | |
197 | * It's used by cpu_probe to distinguish between R3000A and R3081. | |
198 | */ | |
199 | static inline int cpu_has_confreg(void) | |
200 | { | |
201 | #ifdef CONFIG_CPU_R3000 | |
202 | extern unsigned long r3k_cache_size(unsigned long); | |
203 | unsigned long size1, size2; | |
204 | unsigned long cfg = read_c0_conf(); | |
205 | ||
206 | size1 = r3k_cache_size(ST0_ISC); | |
207 | write_c0_conf(cfg ^ R30XX_CONF_AC); | |
208 | size2 = r3k_cache_size(ST0_ISC); | |
209 | write_c0_conf(cfg); | |
210 | return size1 != size2; | |
211 | #else | |
212 | return 0; | |
213 | #endif | |
214 | } | |
215 | ||
216 | /* | |
217 | * Get the FPU Implementation/Revision. | |
218 | */ | |
219 | static inline unsigned long cpu_get_fpu_id(void) | |
220 | { | |
221 | unsigned long tmp, fpu_id; | |
222 | ||
223 | tmp = read_c0_status(); | |
224 | __enable_fpu(); | |
225 | fpu_id = read_32bit_cp1_register(CP1_REVISION); | |
226 | write_c0_status(tmp); | |
227 | return fpu_id; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Check the CPU has an FPU the official way. | |
232 | */ | |
233 | static inline int __cpu_has_fpu(void) | |
234 | { | |
235 | return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE); | |
236 | } | |
237 | ||
02cf2119 | 238 | #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \ |
1da177e4 LT |
239 | | MIPS_CPU_COUNTER) |
240 | ||
241 | static inline void cpu_probe_legacy(struct cpuinfo_mips *c) | |
242 | { | |
243 | switch (c->processor_id & 0xff00) { | |
244 | case PRID_IMP_R2000: | |
245 | c->cputype = CPU_R2000; | |
246 | c->isa_level = MIPS_CPU_ISA_I; | |
02cf2119 RB |
247 | c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | |
248 | MIPS_CPU_NOFPUEX; | |
1da177e4 LT |
249 | if (__cpu_has_fpu()) |
250 | c->options |= MIPS_CPU_FPU; | |
251 | c->tlbsize = 64; | |
252 | break; | |
253 | case PRID_IMP_R3000: | |
254 | if ((c->processor_id & 0xff) == PRID_REV_R3000A) | |
255 | if (cpu_has_confreg()) | |
256 | c->cputype = CPU_R3081E; | |
257 | else | |
258 | c->cputype = CPU_R3000A; | |
259 | else | |
260 | c->cputype = CPU_R3000; | |
261 | c->isa_level = MIPS_CPU_ISA_I; | |
02cf2119 RB |
262 | c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | |
263 | MIPS_CPU_NOFPUEX; | |
1da177e4 LT |
264 | if (__cpu_has_fpu()) |
265 | c->options |= MIPS_CPU_FPU; | |
266 | c->tlbsize = 64; | |
267 | break; | |
268 | case PRID_IMP_R4000: | |
269 | if (read_c0_config() & CONF_SC) { | |
270 | if ((c->processor_id & 0xff) >= PRID_REV_R4400) | |
271 | c->cputype = CPU_R4400PC; | |
272 | else | |
273 | c->cputype = CPU_R4000PC; | |
274 | } else { | |
275 | if ((c->processor_id & 0xff) >= PRID_REV_R4400) | |
276 | c->cputype = CPU_R4400SC; | |
277 | else | |
278 | c->cputype = CPU_R4000SC; | |
279 | } | |
280 | ||
281 | c->isa_level = MIPS_CPU_ISA_III; | |
282 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
283 | MIPS_CPU_WATCH | MIPS_CPU_VCE | | |
284 | MIPS_CPU_LLSC; | |
285 | c->tlbsize = 48; | |
286 | break; | |
287 | case PRID_IMP_VR41XX: | |
288 | switch (c->processor_id & 0xf0) { | |
1da177e4 LT |
289 | case PRID_REV_VR4111: |
290 | c->cputype = CPU_VR4111; | |
291 | break; | |
1da177e4 LT |
292 | case PRID_REV_VR4121: |
293 | c->cputype = CPU_VR4121; | |
294 | break; | |
295 | case PRID_REV_VR4122: | |
296 | if ((c->processor_id & 0xf) < 0x3) | |
297 | c->cputype = CPU_VR4122; | |
298 | else | |
299 | c->cputype = CPU_VR4181A; | |
300 | break; | |
301 | case PRID_REV_VR4130: | |
302 | if ((c->processor_id & 0xf) < 0x4) | |
303 | c->cputype = CPU_VR4131; | |
304 | else | |
305 | c->cputype = CPU_VR4133; | |
306 | break; | |
307 | default: | |
308 | printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n"); | |
309 | c->cputype = CPU_VR41XX; | |
310 | break; | |
311 | } | |
312 | c->isa_level = MIPS_CPU_ISA_III; | |
313 | c->options = R4K_OPTS; | |
314 | c->tlbsize = 32; | |
315 | break; | |
316 | case PRID_IMP_R4300: | |
317 | c->cputype = CPU_R4300; | |
318 | c->isa_level = MIPS_CPU_ISA_III; | |
319 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
320 | MIPS_CPU_LLSC; | |
321 | c->tlbsize = 32; | |
322 | break; | |
323 | case PRID_IMP_R4600: | |
324 | c->cputype = CPU_R4600; | |
325 | c->isa_level = MIPS_CPU_ISA_III; | |
075e7502 TS |
326 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
327 | MIPS_CPU_LLSC; | |
1da177e4 LT |
328 | c->tlbsize = 48; |
329 | break; | |
330 | #if 0 | |
331 | case PRID_IMP_R4650: | |
332 | /* | |
333 | * This processor doesn't have an MMU, so it's not | |
334 | * "real easy" to run Linux on it. It is left purely | |
335 | * for documentation. Commented out because it shares | |
336 | * it's c0_prid id number with the TX3900. | |
337 | */ | |
a3dddd56 | 338 | c->cputype = CPU_R4650; |
1da177e4 LT |
339 | c->isa_level = MIPS_CPU_ISA_III; |
340 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC; | |
341 | c->tlbsize = 48; | |
342 | break; | |
343 | #endif | |
344 | case PRID_IMP_TX39: | |
345 | c->isa_level = MIPS_CPU_ISA_I; | |
02cf2119 | 346 | c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE; |
1da177e4 LT |
347 | |
348 | if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) { | |
349 | c->cputype = CPU_TX3927; | |
350 | c->tlbsize = 64; | |
351 | } else { | |
352 | switch (c->processor_id & 0xff) { | |
353 | case PRID_REV_TX3912: | |
354 | c->cputype = CPU_TX3912; | |
355 | c->tlbsize = 32; | |
356 | break; | |
357 | case PRID_REV_TX3922: | |
358 | c->cputype = CPU_TX3922; | |
359 | c->tlbsize = 64; | |
360 | break; | |
361 | default: | |
362 | c->cputype = CPU_UNKNOWN; | |
363 | break; | |
364 | } | |
365 | } | |
366 | break; | |
367 | case PRID_IMP_R4700: | |
368 | c->cputype = CPU_R4700; | |
369 | c->isa_level = MIPS_CPU_ISA_III; | |
370 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
371 | MIPS_CPU_LLSC; | |
372 | c->tlbsize = 48; | |
373 | break; | |
374 | case PRID_IMP_TX49: | |
375 | c->cputype = CPU_TX49XX; | |
376 | c->isa_level = MIPS_CPU_ISA_III; | |
377 | c->options = R4K_OPTS | MIPS_CPU_LLSC; | |
378 | if (!(c->processor_id & 0x08)) | |
379 | c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR; | |
380 | c->tlbsize = 48; | |
381 | break; | |
382 | case PRID_IMP_R5000: | |
383 | c->cputype = CPU_R5000; | |
384 | c->isa_level = MIPS_CPU_ISA_IV; | |
385 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
386 | MIPS_CPU_LLSC; | |
387 | c->tlbsize = 48; | |
388 | break; | |
389 | case PRID_IMP_R5432: | |
390 | c->cputype = CPU_R5432; | |
391 | c->isa_level = MIPS_CPU_ISA_IV; | |
392 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
393 | MIPS_CPU_WATCH | MIPS_CPU_LLSC; | |
394 | c->tlbsize = 48; | |
395 | break; | |
396 | case PRID_IMP_R5500: | |
397 | c->cputype = CPU_R5500; | |
398 | c->isa_level = MIPS_CPU_ISA_IV; | |
399 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
400 | MIPS_CPU_WATCH | MIPS_CPU_LLSC; | |
401 | c->tlbsize = 48; | |
402 | break; | |
403 | case PRID_IMP_NEVADA: | |
404 | c->cputype = CPU_NEVADA; | |
405 | c->isa_level = MIPS_CPU_ISA_IV; | |
406 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
407 | MIPS_CPU_DIVEC | MIPS_CPU_LLSC; | |
408 | c->tlbsize = 48; | |
409 | break; | |
410 | case PRID_IMP_R6000: | |
411 | c->cputype = CPU_R6000; | |
412 | c->isa_level = MIPS_CPU_ISA_II; | |
413 | c->options = MIPS_CPU_TLB | MIPS_CPU_FPU | | |
414 | MIPS_CPU_LLSC; | |
415 | c->tlbsize = 32; | |
416 | break; | |
417 | case PRID_IMP_R6000A: | |
418 | c->cputype = CPU_R6000A; | |
419 | c->isa_level = MIPS_CPU_ISA_II; | |
420 | c->options = MIPS_CPU_TLB | MIPS_CPU_FPU | | |
421 | MIPS_CPU_LLSC; | |
422 | c->tlbsize = 32; | |
423 | break; | |
424 | case PRID_IMP_RM7000: | |
425 | c->cputype = CPU_RM7000; | |
426 | c->isa_level = MIPS_CPU_ISA_IV; | |
427 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
428 | MIPS_CPU_LLSC; | |
429 | /* | |
430 | * Undocumented RM7000: Bit 29 in the info register of | |
431 | * the RM7000 v2.0 indicates if the TLB has 48 or 64 | |
432 | * entries. | |
433 | * | |
434 | * 29 1 => 64 entry JTLB | |
435 | * 0 => 48 entry JTLB | |
436 | */ | |
437 | c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; | |
438 | break; | |
439 | case PRID_IMP_RM9000: | |
440 | c->cputype = CPU_RM9000; | |
441 | c->isa_level = MIPS_CPU_ISA_IV; | |
442 | c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
443 | MIPS_CPU_LLSC; | |
444 | /* | |
445 | * Bit 29 in the info register of the RM9000 | |
446 | * indicates if the TLB has 48 or 64 entries. | |
447 | * | |
448 | * 29 1 => 64 entry JTLB | |
449 | * 0 => 48 entry JTLB | |
450 | */ | |
451 | c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; | |
452 | break; | |
453 | case PRID_IMP_R8000: | |
454 | c->cputype = CPU_R8000; | |
455 | c->isa_level = MIPS_CPU_ISA_IV; | |
456 | c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX | | |
457 | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
458 | MIPS_CPU_LLSC; | |
459 | c->tlbsize = 384; /* has weird TLB: 3-way x 128 */ | |
460 | break; | |
461 | case PRID_IMP_R10000: | |
462 | c->cputype = CPU_R10000; | |
463 | c->isa_level = MIPS_CPU_ISA_IV; | |
8b36612a | 464 | c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | |
1da177e4 LT |
465 | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
466 | MIPS_CPU_COUNTER | MIPS_CPU_WATCH | | |
467 | MIPS_CPU_LLSC; | |
468 | c->tlbsize = 64; | |
469 | break; | |
470 | case PRID_IMP_R12000: | |
471 | c->cputype = CPU_R12000; | |
472 | c->isa_level = MIPS_CPU_ISA_IV; | |
8b36612a | 473 | c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | |
1da177e4 LT |
474 | MIPS_CPU_FPU | MIPS_CPU_32FPR | |
475 | MIPS_CPU_COUNTER | MIPS_CPU_WATCH | | |
476 | MIPS_CPU_LLSC; | |
477 | c->tlbsize = 64; | |
478 | break; | |
44d921b2 K |
479 | case PRID_IMP_R14000: |
480 | c->cputype = CPU_R14000; | |
481 | c->isa_level = MIPS_CPU_ISA_IV; | |
482 | c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | | |
483 | MIPS_CPU_FPU | MIPS_CPU_32FPR | | |
484 | MIPS_CPU_COUNTER | MIPS_CPU_WATCH | | |
485 | MIPS_CPU_LLSC; | |
486 | c->tlbsize = 64; | |
487 | break; | |
1da177e4 LT |
488 | } |
489 | } | |
490 | ||
b4672d37 RB |
491 | static char unknown_isa[] __initdata = KERN_ERR \ |
492 | "Unsupported ISA type, c0.config0: %d."; | |
493 | ||
4194318c | 494 | static inline unsigned int decode_config0(struct cpuinfo_mips *c) |
1da177e4 | 495 | { |
4194318c RB |
496 | unsigned int config0; |
497 | int isa; | |
1da177e4 | 498 | |
4194318c RB |
499 | config0 = read_c0_config(); |
500 | ||
501 | if (((config0 & MIPS_CONF_MT) >> 7) == 1) | |
02cf2119 | 502 | c->options |= MIPS_CPU_TLB; |
4194318c RB |
503 | isa = (config0 & MIPS_CONF_AT) >> 13; |
504 | switch (isa) { | |
505 | case 0: | |
3a01c49a | 506 | switch ((config0 & MIPS_CONF_AR) >> 10) { |
b4672d37 RB |
507 | case 0: |
508 | c->isa_level = MIPS_CPU_ISA_M32R1; | |
509 | break; | |
510 | case 1: | |
511 | c->isa_level = MIPS_CPU_ISA_M32R2; | |
512 | break; | |
513 | default: | |
514 | goto unknown; | |
515 | } | |
4194318c RB |
516 | break; |
517 | case 2: | |
3a01c49a | 518 | switch ((config0 & MIPS_CONF_AR) >> 10) { |
b4672d37 RB |
519 | case 0: |
520 | c->isa_level = MIPS_CPU_ISA_M64R1; | |
521 | break; | |
522 | case 1: | |
523 | c->isa_level = MIPS_CPU_ISA_M64R2; | |
524 | break; | |
525 | default: | |
526 | goto unknown; | |
527 | } | |
4194318c RB |
528 | break; |
529 | default: | |
b4672d37 | 530 | goto unknown; |
4194318c RB |
531 | } |
532 | ||
533 | return config0 & MIPS_CONF_M; | |
b4672d37 RB |
534 | |
535 | unknown: | |
536 | panic(unknown_isa, config0); | |
4194318c RB |
537 | } |
538 | ||
539 | static inline unsigned int decode_config1(struct cpuinfo_mips *c) | |
540 | { | |
541 | unsigned int config1; | |
1da177e4 | 542 | |
1da177e4 | 543 | config1 = read_c0_config1(); |
4194318c RB |
544 | |
545 | if (config1 & MIPS_CONF1_MD) | |
546 | c->ases |= MIPS_ASE_MDMX; | |
547 | if (config1 & MIPS_CONF1_WR) | |
1da177e4 | 548 | c->options |= MIPS_CPU_WATCH; |
4194318c RB |
549 | if (config1 & MIPS_CONF1_CA) |
550 | c->ases |= MIPS_ASE_MIPS16; | |
551 | if (config1 & MIPS_CONF1_EP) | |
1da177e4 | 552 | c->options |= MIPS_CPU_EJTAG; |
4194318c | 553 | if (config1 & MIPS_CONF1_FP) { |
1da177e4 LT |
554 | c->options |= MIPS_CPU_FPU; |
555 | c->options |= MIPS_CPU_32FPR; | |
556 | } | |
4194318c RB |
557 | if (cpu_has_tlb) |
558 | c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1; | |
559 | ||
560 | return config1 & MIPS_CONF_M; | |
561 | } | |
562 | ||
563 | static inline unsigned int decode_config2(struct cpuinfo_mips *c) | |
564 | { | |
565 | unsigned int config2; | |
566 | ||
567 | config2 = read_c0_config2(); | |
568 | ||
569 | if (config2 & MIPS_CONF2_SL) | |
570 | c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT; | |
571 | ||
572 | return config2 & MIPS_CONF_M; | |
573 | } | |
574 | ||
575 | static inline unsigned int decode_config3(struct cpuinfo_mips *c) | |
576 | { | |
577 | unsigned int config3; | |
578 | ||
579 | config3 = read_c0_config3(); | |
580 | ||
581 | if (config3 & MIPS_CONF3_SM) | |
582 | c->ases |= MIPS_ASE_SMARTMIPS; | |
e50c0a8f RB |
583 | if (config3 & MIPS_CONF3_DSP) |
584 | c->ases |= MIPS_ASE_DSP; | |
8f40611d RB |
585 | if (config3 & MIPS_CONF3_VINT) |
586 | c->options |= MIPS_CPU_VINT; | |
587 | if (config3 & MIPS_CONF3_VEIC) | |
588 | c->options |= MIPS_CPU_VEIC; | |
589 | if (config3 & MIPS_CONF3_MT) | |
e0daad44 | 590 | c->ases |= MIPS_ASE_MIPSMT; |
4194318c RB |
591 | |
592 | return config3 & MIPS_CONF_M; | |
593 | } | |
594 | ||
c36cd4ba | 595 | static void __init decode_configs(struct cpuinfo_mips *c) |
4194318c RB |
596 | { |
597 | /* MIPS32 or MIPS64 compliant CPU. */ | |
02cf2119 RB |
598 | c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER | |
599 | MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK; | |
4194318c | 600 | |
1da177e4 LT |
601 | c->scache.flags = MIPS_CACHE_NOT_PRESENT; |
602 | ||
4194318c RB |
603 | /* Read Config registers. */ |
604 | if (!decode_config0(c)) | |
605 | return; /* actually worth a panic() */ | |
606 | if (!decode_config1(c)) | |
607 | return; | |
608 | if (!decode_config2(c)) | |
609 | return; | |
610 | if (!decode_config3(c)) | |
611 | return; | |
1da177e4 LT |
612 | } |
613 | ||
614 | static inline void cpu_probe_mips(struct cpuinfo_mips *c) | |
615 | { | |
4194318c | 616 | decode_configs(c); |
1da177e4 LT |
617 | switch (c->processor_id & 0xff00) { |
618 | case PRID_IMP_4KC: | |
619 | c->cputype = CPU_4KC; | |
1da177e4 LT |
620 | break; |
621 | case PRID_IMP_4KEC: | |
622 | c->cputype = CPU_4KEC; | |
1da177e4 | 623 | break; |
2b07bd02 RB |
624 | case PRID_IMP_4KECR2: |
625 | c->cputype = CPU_4KEC; | |
2b07bd02 | 626 | break; |
1da177e4 | 627 | case PRID_IMP_4KSC: |
8afcb5d8 | 628 | case PRID_IMP_4KSD: |
1da177e4 | 629 | c->cputype = CPU_4KSC; |
1da177e4 LT |
630 | break; |
631 | case PRID_IMP_5KC: | |
632 | c->cputype = CPU_5KC; | |
1da177e4 LT |
633 | break; |
634 | case PRID_IMP_20KC: | |
635 | c->cputype = CPU_20KC; | |
1da177e4 LT |
636 | break; |
637 | case PRID_IMP_24K: | |
e50c0a8f | 638 | case PRID_IMP_24KE: |
1da177e4 | 639 | c->cputype = CPU_24K; |
1da177e4 LT |
640 | break; |
641 | case PRID_IMP_25KF: | |
642 | c->cputype = CPU_25KF; | |
1da177e4 | 643 | break; |
bbc7f22f RB |
644 | case PRID_IMP_34K: |
645 | c->cputype = CPU_34K; | |
bbc7f22f | 646 | break; |
c620953c CD |
647 | case PRID_IMP_74K: |
648 | c->cputype = CPU_74K; | |
649 | break; | |
1da177e4 LT |
650 | } |
651 | } | |
652 | ||
653 | static inline void cpu_probe_alchemy(struct cpuinfo_mips *c) | |
654 | { | |
4194318c | 655 | decode_configs(c); |
1da177e4 LT |
656 | switch (c->processor_id & 0xff00) { |
657 | case PRID_IMP_AU1_REV1: | |
658 | case PRID_IMP_AU1_REV2: | |
659 | switch ((c->processor_id >> 24) & 0xff) { | |
660 | case 0: | |
a3dddd56 | 661 | c->cputype = CPU_AU1000; |
1da177e4 LT |
662 | break; |
663 | case 1: | |
664 | c->cputype = CPU_AU1500; | |
665 | break; | |
666 | case 2: | |
667 | c->cputype = CPU_AU1100; | |
668 | break; | |
669 | case 3: | |
670 | c->cputype = CPU_AU1550; | |
671 | break; | |
e3ad1c23 PP |
672 | case 4: |
673 | c->cputype = CPU_AU1200; | |
674 | break; | |
1da177e4 LT |
675 | default: |
676 | panic("Unknown Au Core!"); | |
677 | break; | |
678 | } | |
1da177e4 LT |
679 | break; |
680 | } | |
681 | } | |
682 | ||
683 | static inline void cpu_probe_sibyte(struct cpuinfo_mips *c) | |
684 | { | |
4194318c | 685 | decode_configs(c); |
02cf2119 RB |
686 | |
687 | /* | |
688 | * For historical reasons the SB1 comes with it's own variant of | |
689 | * cache code which eventually will be folded into c-r4k.c. Until | |
690 | * then we pretend it's got it's own cache architecture. | |
691 | */ | |
d121ced2 | 692 | c->options &= ~MIPS_CPU_4K_CACHE; |
02cf2119 RB |
693 | c->options |= MIPS_CPU_SB1_CACHE; |
694 | ||
1da177e4 LT |
695 | switch (c->processor_id & 0xff00) { |
696 | case PRID_IMP_SB1: | |
697 | c->cputype = CPU_SB1; | |
1da177e4 | 698 | /* FPU in pass1 is known to have issues. */ |
aa32374a | 699 | if ((c->processor_id & 0xff) < 0x02) |
010b853b | 700 | c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR); |
1da177e4 | 701 | break; |
93ce2f52 AI |
702 | case PRID_IMP_SB1A: |
703 | c->cputype = CPU_SB1A; | |
704 | break; | |
1da177e4 LT |
705 | } |
706 | } | |
707 | ||
708 | static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c) | |
709 | { | |
4194318c | 710 | decode_configs(c); |
1da177e4 LT |
711 | switch (c->processor_id & 0xff00) { |
712 | case PRID_IMP_SR71000: | |
713 | c->cputype = CPU_SR71000; | |
1da177e4 LT |
714 | c->scache.ways = 8; |
715 | c->tlbsize = 64; | |
716 | break; | |
717 | } | |
718 | } | |
719 | ||
bdf21b18 PP |
720 | static inline void cpu_probe_philips(struct cpuinfo_mips *c) |
721 | { | |
722 | decode_configs(c); | |
723 | switch (c->processor_id & 0xff00) { | |
724 | case PRID_IMP_PR4450: | |
725 | c->cputype = CPU_PR4450; | |
e7958bb9 | 726 | c->isa_level = MIPS_CPU_ISA_M32R1; |
bdf21b18 PP |
727 | break; |
728 | default: | |
729 | panic("Unknown Philips Core!"); /* REVISIT: die? */ | |
730 | break; | |
731 | } | |
732 | } | |
733 | ||
734 | ||
1da177e4 LT |
735 | __init void cpu_probe(void) |
736 | { | |
737 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
738 | ||
739 | c->processor_id = PRID_IMP_UNKNOWN; | |
740 | c->fpu_id = FPIR_IMP_NONE; | |
741 | c->cputype = CPU_UNKNOWN; | |
742 | ||
743 | c->processor_id = read_c0_prid(); | |
744 | switch (c->processor_id & 0xff0000) { | |
745 | case PRID_COMP_LEGACY: | |
746 | cpu_probe_legacy(c); | |
747 | break; | |
748 | case PRID_COMP_MIPS: | |
749 | cpu_probe_mips(c); | |
750 | break; | |
751 | case PRID_COMP_ALCHEMY: | |
752 | cpu_probe_alchemy(c); | |
753 | break; | |
754 | case PRID_COMP_SIBYTE: | |
755 | cpu_probe_sibyte(c); | |
756 | break; | |
1da177e4 LT |
757 | case PRID_COMP_SANDCRAFT: |
758 | cpu_probe_sandcraft(c); | |
759 | break; | |
bdf21b18 PP |
760 | case PRID_COMP_PHILIPS: |
761 | cpu_probe_philips(c); | |
a3dddd56 | 762 | break; |
1da177e4 LT |
763 | default: |
764 | c->cputype = CPU_UNKNOWN; | |
765 | } | |
4194318c | 766 | if (c->options & MIPS_CPU_FPU) { |
1da177e4 | 767 | c->fpu_id = cpu_get_fpu_id(); |
4194318c | 768 | |
e7958bb9 | 769 | if (c->isa_level == MIPS_CPU_ISA_M32R1 || |
b4672d37 RB |
770 | c->isa_level == MIPS_CPU_ISA_M32R2 || |
771 | c->isa_level == MIPS_CPU_ISA_M64R1 || | |
772 | c->isa_level == MIPS_CPU_ISA_M64R2) { | |
4194318c RB |
773 | if (c->fpu_id & MIPS_FPIR_3D) |
774 | c->ases |= MIPS_ASE_MIPS3D; | |
775 | } | |
776 | } | |
1da177e4 LT |
777 | } |
778 | ||
779 | __init void cpu_report(void) | |
780 | { | |
781 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
782 | ||
783 | printk("CPU revision is: %08x\n", c->processor_id); | |
784 | if (c->options & MIPS_CPU_FPU) | |
785 | printk("FPU revision is: %08x\n", c->fpu_id); | |
786 | } |