xref: /linux/arch/mips/kernel/cpu-probe.c (revision 5f2d44591fb374ae346a3df682d722b68552adc2)
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, 2011, 2012	 MIPS Technologies, 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/export.h>
20 
21 #include <asm/bugs.h>
22 #include <asm/cpu.h>
23 #include <asm/cpu-type.h>
24 #include <asm/fpu.h>
25 #include <asm/mipsregs.h>
26 #include <asm/mipsmtregs.h>
27 #include <asm/msa.h>
28 #include <asm/watch.h>
29 #include <asm/elf.h>
30 #include <asm/pgtable-bits.h>
31 #include <asm/spram.h>
32 #include <asm/uaccess.h>
33 
34 static int mips_fpu_disabled;
35 
36 static int __init fpu_disable(char *s)
37 {
38 	cpu_data[0].options &= ~MIPS_CPU_FPU;
39 	mips_fpu_disabled = 1;
40 
41 	return 1;
42 }
43 
44 __setup("nofpu", fpu_disable);
45 
46 int mips_dsp_disabled;
47 
48 static int __init dsp_disable(char *s)
49 {
50 	cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
51 	mips_dsp_disabled = 1;
52 
53 	return 1;
54 }
55 
56 __setup("nodsp", dsp_disable);
57 
58 static int mips_htw_disabled;
59 
60 static int __init htw_disable(char *s)
61 {
62 	mips_htw_disabled = 1;
63 	cpu_data[0].options &= ~MIPS_CPU_HTW;
64 	write_c0_pwctl(read_c0_pwctl() &
65 		       ~(1 << MIPS_PWCTL_PWEN_SHIFT));
66 
67 	return 1;
68 }
69 
70 __setup("nohtw", htw_disable);
71 
72 static int mips_ftlb_disabled;
73 static int mips_has_ftlb_configured;
74 
75 static void set_ftlb_enable(struct cpuinfo_mips *c, int enable);
76 
77 static int __init ftlb_disable(char *s)
78 {
79 	unsigned int config4, mmuextdef;
80 
81 	/*
82 	 * If the core hasn't done any FTLB configuration, there is nothing
83 	 * for us to do here.
84 	 */
85 	if (!mips_has_ftlb_configured)
86 		return 1;
87 
88 	/* Disable it in the boot cpu */
89 	set_ftlb_enable(&cpu_data[0], 0);
90 
91 	back_to_back_c0_hazard();
92 
93 	config4 = read_c0_config4();
94 
95 	/* Check that FTLB has been disabled */
96 	mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
97 	/* MMUSIZEEXT == VTLB ON, FTLB OFF */
98 	if (mmuextdef == MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT) {
99 		/* This should never happen */
100 		pr_warn("FTLB could not be disabled!\n");
101 		return 1;
102 	}
103 
104 	mips_ftlb_disabled = 1;
105 	mips_has_ftlb_configured = 0;
106 
107 	/*
108 	 * noftlb is mainly used for debug purposes so print
109 	 * an informative message instead of using pr_debug()
110 	 */
111 	pr_info("FTLB has been disabled\n");
112 
113 	/*
114 	 * Some of these bits are duplicated in the decode_config4.
115 	 * MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT is the only possible case
116 	 * once FTLB has been disabled so undo what decode_config4 did.
117 	 */
118 	cpu_data[0].tlbsize -= cpu_data[0].tlbsizeftlbways *
119 			       cpu_data[0].tlbsizeftlbsets;
120 	cpu_data[0].tlbsizeftlbsets = 0;
121 	cpu_data[0].tlbsizeftlbways = 0;
122 
123 	return 1;
124 }
125 
126 __setup("noftlb", ftlb_disable);
127 
128 
129 static inline void check_errata(void)
130 {
131 	struct cpuinfo_mips *c = &current_cpu_data;
132 
133 	switch (current_cpu_type()) {
134 	case CPU_34K:
135 		/*
136 		 * Erratum "RPS May Cause Incorrect Instruction Execution"
137 		 * This code only handles VPE0, any SMP/RTOS code
138 		 * making use of VPE1 will be responsable for that VPE.
139 		 */
140 		if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
141 			write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
142 		break;
143 	default:
144 		break;
145 	}
146 }
147 
148 void __init check_bugs32(void)
149 {
150 	check_errata();
151 }
152 
153 /*
154  * Probe whether cpu has config register by trying to play with
155  * alternate cache bit and see whether it matters.
156  * It's used by cpu_probe to distinguish between R3000A and R3081.
157  */
158 static inline int cpu_has_confreg(void)
159 {
160 #ifdef CONFIG_CPU_R3000
161 	extern unsigned long r3k_cache_size(unsigned long);
162 	unsigned long size1, size2;
163 	unsigned long cfg = read_c0_conf();
164 
165 	size1 = r3k_cache_size(ST0_ISC);
166 	write_c0_conf(cfg ^ R30XX_CONF_AC);
167 	size2 = r3k_cache_size(ST0_ISC);
168 	write_c0_conf(cfg);
169 	return size1 != size2;
170 #else
171 	return 0;
172 #endif
173 }
174 
175 static inline void set_elf_platform(int cpu, const char *plat)
176 {
177 	if (cpu == 0)
178 		__elf_platform = plat;
179 }
180 
181 /*
182  * Get the FPU Implementation/Revision.
183  */
184 static inline unsigned long cpu_get_fpu_id(void)
185 {
186 	unsigned long tmp, fpu_id;
187 
188 	tmp = read_c0_status();
189 	__enable_fpu(FPU_AS_IS);
190 	fpu_id = read_32bit_cp1_register(CP1_REVISION);
191 	write_c0_status(tmp);
192 	return fpu_id;
193 }
194 
195 /*
196  * Check the CPU has an FPU the official way.
197  */
198 static inline int __cpu_has_fpu(void)
199 {
200 	return (cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE;
201 }
202 
203 static inline unsigned long cpu_get_msa_id(void)
204 {
205 	unsigned long status, msa_id;
206 
207 	status = read_c0_status();
208 	__enable_fpu(FPU_64BIT);
209 	enable_msa();
210 	msa_id = read_msa_ir();
211 	disable_msa();
212 	write_c0_status(status);
213 	return msa_id;
214 }
215 
216 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
217 {
218 #ifdef __NEED_VMBITS_PROBE
219 	write_c0_entryhi(0x3fffffffffffe000ULL);
220 	back_to_back_c0_hazard();
221 	c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
222 #endif
223 }
224 
225 static void set_isa(struct cpuinfo_mips *c, unsigned int isa)
226 {
227 	switch (isa) {
228 	case MIPS_CPU_ISA_M64R2:
229 		c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2;
230 	case MIPS_CPU_ISA_M64R1:
231 		c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1;
232 	case MIPS_CPU_ISA_V:
233 		c->isa_level |= MIPS_CPU_ISA_V;
234 	case MIPS_CPU_ISA_IV:
235 		c->isa_level |= MIPS_CPU_ISA_IV;
236 	case MIPS_CPU_ISA_III:
237 		c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III;
238 		break;
239 
240 	/* R6 incompatible with everything else */
241 	case MIPS_CPU_ISA_M64R6:
242 		c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6;
243 	case MIPS_CPU_ISA_M32R6:
244 		c->isa_level |= MIPS_CPU_ISA_M32R6;
245 		/* Break here so we don't add incompatible ISAs */
246 		break;
247 	case MIPS_CPU_ISA_M32R2:
248 		c->isa_level |= MIPS_CPU_ISA_M32R2;
249 	case MIPS_CPU_ISA_M32R1:
250 		c->isa_level |= MIPS_CPU_ISA_M32R1;
251 	case MIPS_CPU_ISA_II:
252 		c->isa_level |= MIPS_CPU_ISA_II;
253 		break;
254 	}
255 }
256 
257 static char unknown_isa[] = KERN_ERR \
258 	"Unsupported ISA type, c0.config0: %d.";
259 
260 static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c)
261 {
262 
263 	unsigned int probability = c->tlbsize / c->tlbsizevtlb;
264 
265 	/*
266 	 * 0 = All TLBWR instructions go to FTLB
267 	 * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the
268 	 * FTLB and 1 goes to the VTLB.
269 	 * 2 = 7:1: As above with 7:1 ratio.
270 	 * 3 = 3:1: As above with 3:1 ratio.
271 	 *
272 	 * Use the linear midpoint as the probability threshold.
273 	 */
274 	if (probability >= 12)
275 		return 1;
276 	else if (probability >= 6)
277 		return 2;
278 	else
279 		/*
280 		 * So FTLB is less than 4 times bigger than VTLB.
281 		 * A 3:1 ratio can still be useful though.
282 		 */
283 		return 3;
284 }
285 
286 static void set_ftlb_enable(struct cpuinfo_mips *c, int enable)
287 {
288 	unsigned int config6;
289 
290 	/* It's implementation dependent how the FTLB can be enabled */
291 	switch (c->cputype) {
292 	case CPU_PROAPTIV:
293 	case CPU_P5600:
294 		/* proAptiv & related cores use Config6 to enable the FTLB */
295 		config6 = read_c0_config6();
296 		/* Clear the old probability value */
297 		config6 &= ~(3 << MIPS_CONF6_FTLBP_SHIFT);
298 		if (enable)
299 			/* Enable FTLB */
300 			write_c0_config6(config6 |
301 					 (calculate_ftlb_probability(c)
302 					  << MIPS_CONF6_FTLBP_SHIFT)
303 					 | MIPS_CONF6_FTLBEN);
304 		else
305 			/* Disable FTLB */
306 			write_c0_config6(config6 &  ~MIPS_CONF6_FTLBEN);
307 		back_to_back_c0_hazard();
308 		break;
309 	}
310 }
311 
312 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
313 {
314 	unsigned int config0;
315 	int isa;
316 
317 	config0 = read_c0_config();
318 
319 	/*
320 	 * Look for Standard TLB or Dual VTLB and FTLB
321 	 */
322 	if ((((config0 & MIPS_CONF_MT) >> 7) == 1) ||
323 	    (((config0 & MIPS_CONF_MT) >> 7) == 4))
324 		c->options |= MIPS_CPU_TLB;
325 
326 	isa = (config0 & MIPS_CONF_AT) >> 13;
327 	switch (isa) {
328 	case 0:
329 		switch ((config0 & MIPS_CONF_AR) >> 10) {
330 		case 0:
331 			set_isa(c, MIPS_CPU_ISA_M32R1);
332 			break;
333 		case 1:
334 			set_isa(c, MIPS_CPU_ISA_M32R2);
335 			break;
336 		case 2:
337 			set_isa(c, MIPS_CPU_ISA_M32R6);
338 			break;
339 		default:
340 			goto unknown;
341 		}
342 		break;
343 	case 2:
344 		switch ((config0 & MIPS_CONF_AR) >> 10) {
345 		case 0:
346 			set_isa(c, MIPS_CPU_ISA_M64R1);
347 			break;
348 		case 1:
349 			set_isa(c, MIPS_CPU_ISA_M64R2);
350 			break;
351 		case 2:
352 			set_isa(c, MIPS_CPU_ISA_M64R6);
353 			break;
354 		default:
355 			goto unknown;
356 		}
357 		break;
358 	default:
359 		goto unknown;
360 	}
361 
362 	return config0 & MIPS_CONF_M;
363 
364 unknown:
365 	panic(unknown_isa, config0);
366 }
367 
368 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
369 {
370 	unsigned int config1;
371 
372 	config1 = read_c0_config1();
373 
374 	if (config1 & MIPS_CONF1_MD)
375 		c->ases |= MIPS_ASE_MDMX;
376 	if (config1 & MIPS_CONF1_WR)
377 		c->options |= MIPS_CPU_WATCH;
378 	if (config1 & MIPS_CONF1_CA)
379 		c->ases |= MIPS_ASE_MIPS16;
380 	if (config1 & MIPS_CONF1_EP)
381 		c->options |= MIPS_CPU_EJTAG;
382 	if (config1 & MIPS_CONF1_FP) {
383 		c->options |= MIPS_CPU_FPU;
384 		c->options |= MIPS_CPU_32FPR;
385 	}
386 	if (cpu_has_tlb) {
387 		c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
388 		c->tlbsizevtlb = c->tlbsize;
389 		c->tlbsizeftlbsets = 0;
390 	}
391 
392 	return config1 & MIPS_CONF_M;
393 }
394 
395 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
396 {
397 	unsigned int config2;
398 
399 	config2 = read_c0_config2();
400 
401 	if (config2 & MIPS_CONF2_SL)
402 		c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
403 
404 	return config2 & MIPS_CONF_M;
405 }
406 
407 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
408 {
409 	unsigned int config3;
410 
411 	config3 = read_c0_config3();
412 
413 	if (config3 & MIPS_CONF3_SM) {
414 		c->ases |= MIPS_ASE_SMARTMIPS;
415 		c->options |= MIPS_CPU_RIXI;
416 	}
417 	if (config3 & MIPS_CONF3_RXI)
418 		c->options |= MIPS_CPU_RIXI;
419 	if (config3 & MIPS_CONF3_DSP)
420 		c->ases |= MIPS_ASE_DSP;
421 	if (config3 & MIPS_CONF3_DSP2P)
422 		c->ases |= MIPS_ASE_DSP2P;
423 	if (config3 & MIPS_CONF3_VINT)
424 		c->options |= MIPS_CPU_VINT;
425 	if (config3 & MIPS_CONF3_VEIC)
426 		c->options |= MIPS_CPU_VEIC;
427 	if (config3 & MIPS_CONF3_MT)
428 		c->ases |= MIPS_ASE_MIPSMT;
429 	if (config3 & MIPS_CONF3_ULRI)
430 		c->options |= MIPS_CPU_ULRI;
431 	if (config3 & MIPS_CONF3_ISA)
432 		c->options |= MIPS_CPU_MICROMIPS;
433 	if (config3 & MIPS_CONF3_VZ)
434 		c->ases |= MIPS_ASE_VZ;
435 	if (config3 & MIPS_CONF3_SC)
436 		c->options |= MIPS_CPU_SEGMENTS;
437 	if (config3 & MIPS_CONF3_MSA)
438 		c->ases |= MIPS_ASE_MSA;
439 	/* Only tested on 32-bit cores */
440 	if ((config3 & MIPS_CONF3_PW) && config_enabled(CONFIG_32BIT)) {
441 		c->htw_seq = 0;
442 		c->options |= MIPS_CPU_HTW;
443 	}
444 	if (config3 & MIPS_CONF3_CDMM)
445 		c->options |= MIPS_CPU_CDMM;
446 
447 	return config3 & MIPS_CONF_M;
448 }
449 
450 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
451 {
452 	unsigned int config4;
453 	unsigned int newcf4;
454 	unsigned int mmuextdef;
455 	unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
456 
457 	config4 = read_c0_config4();
458 
459 	if (cpu_has_tlb) {
460 		if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
461 			c->options |= MIPS_CPU_TLBINV;
462 		mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
463 		switch (mmuextdef) {
464 		case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
465 			c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
466 			c->tlbsizevtlb = c->tlbsize;
467 			break;
468 		case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
469 			c->tlbsizevtlb +=
470 				((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
471 				  MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
472 			c->tlbsize = c->tlbsizevtlb;
473 			ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
474 			/* fall through */
475 		case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
476 			if (mips_ftlb_disabled)
477 				break;
478 			newcf4 = (config4 & ~ftlb_page) |
479 				(page_size_ftlb(mmuextdef) <<
480 				 MIPS_CONF4_FTLBPAGESIZE_SHIFT);
481 			write_c0_config4(newcf4);
482 			back_to_back_c0_hazard();
483 			config4 = read_c0_config4();
484 			if (config4 != newcf4) {
485 				pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
486 				       PAGE_SIZE, config4);
487 				/* Switch FTLB off */
488 				set_ftlb_enable(c, 0);
489 				break;
490 			}
491 			c->tlbsizeftlbsets = 1 <<
492 				((config4 & MIPS_CONF4_FTLBSETS) >>
493 				 MIPS_CONF4_FTLBSETS_SHIFT);
494 			c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
495 					      MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
496 			c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
497 			mips_has_ftlb_configured = 1;
498 			break;
499 		}
500 	}
501 
502 	c->kscratch_mask = (config4 >> 16) & 0xff;
503 
504 	return config4 & MIPS_CONF_M;
505 }
506 
507 static inline unsigned int decode_config5(struct cpuinfo_mips *c)
508 {
509 	unsigned int config5;
510 
511 	config5 = read_c0_config5();
512 	config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
513 	write_c0_config5(config5);
514 
515 	if (config5 & MIPS_CONF5_EVA)
516 		c->options |= MIPS_CPU_EVA;
517 	if (config5 & MIPS_CONF5_MRP)
518 		c->options |= MIPS_CPU_MAAR;
519 	if (config5 & MIPS_CONF5_LLB)
520 		c->options |= MIPS_CPU_RW_LLB;
521 
522 	return config5 & MIPS_CONF_M;
523 }
524 
525 static void decode_configs(struct cpuinfo_mips *c)
526 {
527 	int ok;
528 
529 	/* MIPS32 or MIPS64 compliant CPU.  */
530 	c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
531 		     MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
532 
533 	c->scache.flags = MIPS_CACHE_NOT_PRESENT;
534 
535 	/* Enable FTLB if present and not disabled */
536 	set_ftlb_enable(c, !mips_ftlb_disabled);
537 
538 	ok = decode_config0(c);			/* Read Config registers.  */
539 	BUG_ON(!ok);				/* Arch spec violation!	 */
540 	if (ok)
541 		ok = decode_config1(c);
542 	if (ok)
543 		ok = decode_config2(c);
544 	if (ok)
545 		ok = decode_config3(c);
546 	if (ok)
547 		ok = decode_config4(c);
548 	if (ok)
549 		ok = decode_config5(c);
550 
551 	mips_probe_watch_registers(c);
552 
553 	if (cpu_has_rixi) {
554 		/* Enable the RIXI exceptions */
555 		set_c0_pagegrain(PG_IEC);
556 		back_to_back_c0_hazard();
557 		/* Verify the IEC bit is set */
558 		if (read_c0_pagegrain() & PG_IEC)
559 			c->options |= MIPS_CPU_RIXIEX;
560 	}
561 
562 #ifndef CONFIG_MIPS_CPS
563 	if (cpu_has_mips_r2_r6) {
564 		c->core = get_ebase_cpunum();
565 		if (cpu_has_mipsmt)
566 			c->core >>= fls(core_nvpes()) - 1;
567 	}
568 #endif
569 }
570 
571 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
572 		| MIPS_CPU_COUNTER)
573 
574 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
575 {
576 	switch (c->processor_id & PRID_IMP_MASK) {
577 	case PRID_IMP_R2000:
578 		c->cputype = CPU_R2000;
579 		__cpu_name[cpu] = "R2000";
580 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
581 			     MIPS_CPU_NOFPUEX;
582 		if (__cpu_has_fpu())
583 			c->options |= MIPS_CPU_FPU;
584 		c->tlbsize = 64;
585 		break;
586 	case PRID_IMP_R3000:
587 		if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
588 			if (cpu_has_confreg()) {
589 				c->cputype = CPU_R3081E;
590 				__cpu_name[cpu] = "R3081";
591 			} else {
592 				c->cputype = CPU_R3000A;
593 				__cpu_name[cpu] = "R3000A";
594 			}
595 		} else {
596 			c->cputype = CPU_R3000;
597 			__cpu_name[cpu] = "R3000";
598 		}
599 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
600 			     MIPS_CPU_NOFPUEX;
601 		if (__cpu_has_fpu())
602 			c->options |= MIPS_CPU_FPU;
603 		c->tlbsize = 64;
604 		break;
605 	case PRID_IMP_R4000:
606 		if (read_c0_config() & CONF_SC) {
607 			if ((c->processor_id & PRID_REV_MASK) >=
608 			    PRID_REV_R4400) {
609 				c->cputype = CPU_R4400PC;
610 				__cpu_name[cpu] = "R4400PC";
611 			} else {
612 				c->cputype = CPU_R4000PC;
613 				__cpu_name[cpu] = "R4000PC";
614 			}
615 		} else {
616 			int cca = read_c0_config() & CONF_CM_CMASK;
617 			int mc;
618 
619 			/*
620 			 * SC and MC versions can't be reliably told apart,
621 			 * but only the latter support coherent caching
622 			 * modes so assume the firmware has set the KSEG0
623 			 * coherency attribute reasonably (if uncached, we
624 			 * assume SC).
625 			 */
626 			switch (cca) {
627 			case CONF_CM_CACHABLE_CE:
628 			case CONF_CM_CACHABLE_COW:
629 			case CONF_CM_CACHABLE_CUW:
630 				mc = 1;
631 				break;
632 			default:
633 				mc = 0;
634 				break;
635 			}
636 			if ((c->processor_id & PRID_REV_MASK) >=
637 			    PRID_REV_R4400) {
638 				c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
639 				__cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
640 			} else {
641 				c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
642 				__cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
643 			}
644 		}
645 
646 		set_isa(c, MIPS_CPU_ISA_III);
647 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
648 			     MIPS_CPU_WATCH | MIPS_CPU_VCE |
649 			     MIPS_CPU_LLSC;
650 		c->tlbsize = 48;
651 		break;
652 	case PRID_IMP_VR41XX:
653 		set_isa(c, MIPS_CPU_ISA_III);
654 		c->options = R4K_OPTS;
655 		c->tlbsize = 32;
656 		switch (c->processor_id & 0xf0) {
657 		case PRID_REV_VR4111:
658 			c->cputype = CPU_VR4111;
659 			__cpu_name[cpu] = "NEC VR4111";
660 			break;
661 		case PRID_REV_VR4121:
662 			c->cputype = CPU_VR4121;
663 			__cpu_name[cpu] = "NEC VR4121";
664 			break;
665 		case PRID_REV_VR4122:
666 			if ((c->processor_id & 0xf) < 0x3) {
667 				c->cputype = CPU_VR4122;
668 				__cpu_name[cpu] = "NEC VR4122";
669 			} else {
670 				c->cputype = CPU_VR4181A;
671 				__cpu_name[cpu] = "NEC VR4181A";
672 			}
673 			break;
674 		case PRID_REV_VR4130:
675 			if ((c->processor_id & 0xf) < 0x4) {
676 				c->cputype = CPU_VR4131;
677 				__cpu_name[cpu] = "NEC VR4131";
678 			} else {
679 				c->cputype = CPU_VR4133;
680 				c->options |= MIPS_CPU_LLSC;
681 				__cpu_name[cpu] = "NEC VR4133";
682 			}
683 			break;
684 		default:
685 			printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
686 			c->cputype = CPU_VR41XX;
687 			__cpu_name[cpu] = "NEC Vr41xx";
688 			break;
689 		}
690 		break;
691 	case PRID_IMP_R4300:
692 		c->cputype = CPU_R4300;
693 		__cpu_name[cpu] = "R4300";
694 		set_isa(c, MIPS_CPU_ISA_III);
695 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
696 			     MIPS_CPU_LLSC;
697 		c->tlbsize = 32;
698 		break;
699 	case PRID_IMP_R4600:
700 		c->cputype = CPU_R4600;
701 		__cpu_name[cpu] = "R4600";
702 		set_isa(c, MIPS_CPU_ISA_III);
703 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
704 			     MIPS_CPU_LLSC;
705 		c->tlbsize = 48;
706 		break;
707 	#if 0
708 	case PRID_IMP_R4650:
709 		/*
710 		 * This processor doesn't have an MMU, so it's not
711 		 * "real easy" to run Linux on it. It is left purely
712 		 * for documentation.  Commented out because it shares
713 		 * it's c0_prid id number with the TX3900.
714 		 */
715 		c->cputype = CPU_R4650;
716 		__cpu_name[cpu] = "R4650";
717 		set_isa(c, MIPS_CPU_ISA_III);
718 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
719 		c->tlbsize = 48;
720 		break;
721 	#endif
722 	case PRID_IMP_TX39:
723 		c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
724 
725 		if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
726 			c->cputype = CPU_TX3927;
727 			__cpu_name[cpu] = "TX3927";
728 			c->tlbsize = 64;
729 		} else {
730 			switch (c->processor_id & PRID_REV_MASK) {
731 			case PRID_REV_TX3912:
732 				c->cputype = CPU_TX3912;
733 				__cpu_name[cpu] = "TX3912";
734 				c->tlbsize = 32;
735 				break;
736 			case PRID_REV_TX3922:
737 				c->cputype = CPU_TX3922;
738 				__cpu_name[cpu] = "TX3922";
739 				c->tlbsize = 64;
740 				break;
741 			}
742 		}
743 		break;
744 	case PRID_IMP_R4700:
745 		c->cputype = CPU_R4700;
746 		__cpu_name[cpu] = "R4700";
747 		set_isa(c, MIPS_CPU_ISA_III);
748 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
749 			     MIPS_CPU_LLSC;
750 		c->tlbsize = 48;
751 		break;
752 	case PRID_IMP_TX49:
753 		c->cputype = CPU_TX49XX;
754 		__cpu_name[cpu] = "R49XX";
755 		set_isa(c, MIPS_CPU_ISA_III);
756 		c->options = R4K_OPTS | MIPS_CPU_LLSC;
757 		if (!(c->processor_id & 0x08))
758 			c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
759 		c->tlbsize = 48;
760 		break;
761 	case PRID_IMP_R5000:
762 		c->cputype = CPU_R5000;
763 		__cpu_name[cpu] = "R5000";
764 		set_isa(c, MIPS_CPU_ISA_IV);
765 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
766 			     MIPS_CPU_LLSC;
767 		c->tlbsize = 48;
768 		break;
769 	case PRID_IMP_R5432:
770 		c->cputype = CPU_R5432;
771 		__cpu_name[cpu] = "R5432";
772 		set_isa(c, MIPS_CPU_ISA_IV);
773 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
774 			     MIPS_CPU_WATCH | MIPS_CPU_LLSC;
775 		c->tlbsize = 48;
776 		break;
777 	case PRID_IMP_R5500:
778 		c->cputype = CPU_R5500;
779 		__cpu_name[cpu] = "R5500";
780 		set_isa(c, MIPS_CPU_ISA_IV);
781 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
782 			     MIPS_CPU_WATCH | MIPS_CPU_LLSC;
783 		c->tlbsize = 48;
784 		break;
785 	case PRID_IMP_NEVADA:
786 		c->cputype = CPU_NEVADA;
787 		__cpu_name[cpu] = "Nevada";
788 		set_isa(c, MIPS_CPU_ISA_IV);
789 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
790 			     MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
791 		c->tlbsize = 48;
792 		break;
793 	case PRID_IMP_R6000:
794 		c->cputype = CPU_R6000;
795 		__cpu_name[cpu] = "R6000";
796 		set_isa(c, MIPS_CPU_ISA_II);
797 		c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
798 			     MIPS_CPU_LLSC;
799 		c->tlbsize = 32;
800 		break;
801 	case PRID_IMP_R6000A:
802 		c->cputype = CPU_R6000A;
803 		__cpu_name[cpu] = "R6000A";
804 		set_isa(c, MIPS_CPU_ISA_II);
805 		c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
806 			     MIPS_CPU_LLSC;
807 		c->tlbsize = 32;
808 		break;
809 	case PRID_IMP_RM7000:
810 		c->cputype = CPU_RM7000;
811 		__cpu_name[cpu] = "RM7000";
812 		set_isa(c, MIPS_CPU_ISA_IV);
813 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
814 			     MIPS_CPU_LLSC;
815 		/*
816 		 * Undocumented RM7000:	 Bit 29 in the info register of
817 		 * the RM7000 v2.0 indicates if the TLB has 48 or 64
818 		 * entries.
819 		 *
820 		 * 29	   1 =>	   64 entry JTLB
821 		 *	   0 =>	   48 entry JTLB
822 		 */
823 		c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
824 		break;
825 	case PRID_IMP_R8000:
826 		c->cputype = CPU_R8000;
827 		__cpu_name[cpu] = "RM8000";
828 		set_isa(c, MIPS_CPU_ISA_IV);
829 		c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
830 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
831 			     MIPS_CPU_LLSC;
832 		c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
833 		break;
834 	case PRID_IMP_R10000:
835 		c->cputype = CPU_R10000;
836 		__cpu_name[cpu] = "R10000";
837 		set_isa(c, MIPS_CPU_ISA_IV);
838 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
839 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
840 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
841 			     MIPS_CPU_LLSC;
842 		c->tlbsize = 64;
843 		break;
844 	case PRID_IMP_R12000:
845 		c->cputype = CPU_R12000;
846 		__cpu_name[cpu] = "R12000";
847 		set_isa(c, MIPS_CPU_ISA_IV);
848 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
849 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
850 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
851 			     MIPS_CPU_LLSC;
852 		c->tlbsize = 64;
853 		break;
854 	case PRID_IMP_R14000:
855 		c->cputype = CPU_R14000;
856 		__cpu_name[cpu] = "R14000";
857 		set_isa(c, MIPS_CPU_ISA_IV);
858 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
859 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
860 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
861 			     MIPS_CPU_LLSC;
862 		c->tlbsize = 64;
863 		break;
864 	case PRID_IMP_LOONGSON_64:  /* Loongson-2/3 */
865 		switch (c->processor_id & PRID_REV_MASK) {
866 		case PRID_REV_LOONGSON2E:
867 			c->cputype = CPU_LOONGSON2;
868 			__cpu_name[cpu] = "ICT Loongson-2";
869 			set_elf_platform(cpu, "loongson2e");
870 			set_isa(c, MIPS_CPU_ISA_III);
871 			break;
872 		case PRID_REV_LOONGSON2F:
873 			c->cputype = CPU_LOONGSON2;
874 			__cpu_name[cpu] = "ICT Loongson-2";
875 			set_elf_platform(cpu, "loongson2f");
876 			set_isa(c, MIPS_CPU_ISA_III);
877 			break;
878 		case PRID_REV_LOONGSON3A:
879 			c->cputype = CPU_LOONGSON3;
880 			__cpu_name[cpu] = "ICT Loongson-3";
881 			set_elf_platform(cpu, "loongson3a");
882 			set_isa(c, MIPS_CPU_ISA_M64R1);
883 			break;
884 		case PRID_REV_LOONGSON3B_R1:
885 		case PRID_REV_LOONGSON3B_R2:
886 			c->cputype = CPU_LOONGSON3;
887 			__cpu_name[cpu] = "ICT Loongson-3";
888 			set_elf_platform(cpu, "loongson3b");
889 			set_isa(c, MIPS_CPU_ISA_M64R1);
890 			break;
891 		}
892 
893 		c->options = R4K_OPTS |
894 			     MIPS_CPU_FPU | MIPS_CPU_LLSC |
895 			     MIPS_CPU_32FPR;
896 		c->tlbsize = 64;
897 		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
898 		break;
899 	case PRID_IMP_LOONGSON_32:  /* Loongson-1 */
900 		decode_configs(c);
901 
902 		c->cputype = CPU_LOONGSON1;
903 
904 		switch (c->processor_id & PRID_REV_MASK) {
905 		case PRID_REV_LOONGSON1B:
906 			__cpu_name[cpu] = "Loongson 1B";
907 			break;
908 		}
909 
910 		break;
911 	}
912 }
913 
914 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
915 {
916 	c->writecombine = _CACHE_UNCACHED_ACCELERATED;
917 	switch (c->processor_id & PRID_IMP_MASK) {
918 	case PRID_IMP_QEMU_GENERIC:
919 		c->writecombine = _CACHE_UNCACHED;
920 		c->cputype = CPU_QEMU_GENERIC;
921 		__cpu_name[cpu] = "MIPS GENERIC QEMU";
922 		break;
923 	case PRID_IMP_4KC:
924 		c->cputype = CPU_4KC;
925 		c->writecombine = _CACHE_UNCACHED;
926 		__cpu_name[cpu] = "MIPS 4Kc";
927 		break;
928 	case PRID_IMP_4KEC:
929 	case PRID_IMP_4KECR2:
930 		c->cputype = CPU_4KEC;
931 		c->writecombine = _CACHE_UNCACHED;
932 		__cpu_name[cpu] = "MIPS 4KEc";
933 		break;
934 	case PRID_IMP_4KSC:
935 	case PRID_IMP_4KSD:
936 		c->cputype = CPU_4KSC;
937 		c->writecombine = _CACHE_UNCACHED;
938 		__cpu_name[cpu] = "MIPS 4KSc";
939 		break;
940 	case PRID_IMP_5KC:
941 		c->cputype = CPU_5KC;
942 		c->writecombine = _CACHE_UNCACHED;
943 		__cpu_name[cpu] = "MIPS 5Kc";
944 		break;
945 	case PRID_IMP_5KE:
946 		c->cputype = CPU_5KE;
947 		c->writecombine = _CACHE_UNCACHED;
948 		__cpu_name[cpu] = "MIPS 5KE";
949 		break;
950 	case PRID_IMP_20KC:
951 		c->cputype = CPU_20KC;
952 		c->writecombine = _CACHE_UNCACHED;
953 		__cpu_name[cpu] = "MIPS 20Kc";
954 		break;
955 	case PRID_IMP_24K:
956 		c->cputype = CPU_24K;
957 		c->writecombine = _CACHE_UNCACHED;
958 		__cpu_name[cpu] = "MIPS 24Kc";
959 		break;
960 	case PRID_IMP_24KE:
961 		c->cputype = CPU_24K;
962 		c->writecombine = _CACHE_UNCACHED;
963 		__cpu_name[cpu] = "MIPS 24KEc";
964 		break;
965 	case PRID_IMP_25KF:
966 		c->cputype = CPU_25KF;
967 		c->writecombine = _CACHE_UNCACHED;
968 		__cpu_name[cpu] = "MIPS 25Kc";
969 		break;
970 	case PRID_IMP_34K:
971 		c->cputype = CPU_34K;
972 		c->writecombine = _CACHE_UNCACHED;
973 		__cpu_name[cpu] = "MIPS 34Kc";
974 		break;
975 	case PRID_IMP_74K:
976 		c->cputype = CPU_74K;
977 		c->writecombine = _CACHE_UNCACHED;
978 		__cpu_name[cpu] = "MIPS 74Kc";
979 		break;
980 	case PRID_IMP_M14KC:
981 		c->cputype = CPU_M14KC;
982 		c->writecombine = _CACHE_UNCACHED;
983 		__cpu_name[cpu] = "MIPS M14Kc";
984 		break;
985 	case PRID_IMP_M14KEC:
986 		c->cputype = CPU_M14KEC;
987 		c->writecombine = _CACHE_UNCACHED;
988 		__cpu_name[cpu] = "MIPS M14KEc";
989 		break;
990 	case PRID_IMP_1004K:
991 		c->cputype = CPU_1004K;
992 		c->writecombine = _CACHE_UNCACHED;
993 		__cpu_name[cpu] = "MIPS 1004Kc";
994 		break;
995 	case PRID_IMP_1074K:
996 		c->cputype = CPU_1074K;
997 		c->writecombine = _CACHE_UNCACHED;
998 		__cpu_name[cpu] = "MIPS 1074Kc";
999 		break;
1000 	case PRID_IMP_INTERAPTIV_UP:
1001 		c->cputype = CPU_INTERAPTIV;
1002 		__cpu_name[cpu] = "MIPS interAptiv";
1003 		break;
1004 	case PRID_IMP_INTERAPTIV_MP:
1005 		c->cputype = CPU_INTERAPTIV;
1006 		__cpu_name[cpu] = "MIPS interAptiv (multi)";
1007 		break;
1008 	case PRID_IMP_PROAPTIV_UP:
1009 		c->cputype = CPU_PROAPTIV;
1010 		__cpu_name[cpu] = "MIPS proAptiv";
1011 		break;
1012 	case PRID_IMP_PROAPTIV_MP:
1013 		c->cputype = CPU_PROAPTIV;
1014 		__cpu_name[cpu] = "MIPS proAptiv (multi)";
1015 		break;
1016 	case PRID_IMP_P5600:
1017 		c->cputype = CPU_P5600;
1018 		__cpu_name[cpu] = "MIPS P5600";
1019 		break;
1020 	case PRID_IMP_M5150:
1021 		c->cputype = CPU_M5150;
1022 		__cpu_name[cpu] = "MIPS M5150";
1023 		break;
1024 	}
1025 
1026 	decode_configs(c);
1027 
1028 	spram_config();
1029 }
1030 
1031 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
1032 {
1033 	decode_configs(c);
1034 	switch (c->processor_id & PRID_IMP_MASK) {
1035 	case PRID_IMP_AU1_REV1:
1036 	case PRID_IMP_AU1_REV2:
1037 		c->cputype = CPU_ALCHEMY;
1038 		switch ((c->processor_id >> 24) & 0xff) {
1039 		case 0:
1040 			__cpu_name[cpu] = "Au1000";
1041 			break;
1042 		case 1:
1043 			__cpu_name[cpu] = "Au1500";
1044 			break;
1045 		case 2:
1046 			__cpu_name[cpu] = "Au1100";
1047 			break;
1048 		case 3:
1049 			__cpu_name[cpu] = "Au1550";
1050 			break;
1051 		case 4:
1052 			__cpu_name[cpu] = "Au1200";
1053 			if ((c->processor_id & PRID_REV_MASK) == 2)
1054 				__cpu_name[cpu] = "Au1250";
1055 			break;
1056 		case 5:
1057 			__cpu_name[cpu] = "Au1210";
1058 			break;
1059 		default:
1060 			__cpu_name[cpu] = "Au1xxx";
1061 			break;
1062 		}
1063 		break;
1064 	}
1065 }
1066 
1067 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
1068 {
1069 	decode_configs(c);
1070 
1071 	c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1072 	switch (c->processor_id & PRID_IMP_MASK) {
1073 	case PRID_IMP_SB1:
1074 		c->cputype = CPU_SB1;
1075 		__cpu_name[cpu] = "SiByte SB1";
1076 		/* FPU in pass1 is known to have issues. */
1077 		if ((c->processor_id & PRID_REV_MASK) < 0x02)
1078 			c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
1079 		break;
1080 	case PRID_IMP_SB1A:
1081 		c->cputype = CPU_SB1A;
1082 		__cpu_name[cpu] = "SiByte SB1A";
1083 		break;
1084 	}
1085 }
1086 
1087 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
1088 {
1089 	decode_configs(c);
1090 	switch (c->processor_id & PRID_IMP_MASK) {
1091 	case PRID_IMP_SR71000:
1092 		c->cputype = CPU_SR71000;
1093 		__cpu_name[cpu] = "Sandcraft SR71000";
1094 		c->scache.ways = 8;
1095 		c->tlbsize = 64;
1096 		break;
1097 	}
1098 }
1099 
1100 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
1101 {
1102 	decode_configs(c);
1103 	switch (c->processor_id & PRID_IMP_MASK) {
1104 	case PRID_IMP_PR4450:
1105 		c->cputype = CPU_PR4450;
1106 		__cpu_name[cpu] = "Philips PR4450";
1107 		set_isa(c, MIPS_CPU_ISA_M32R1);
1108 		break;
1109 	}
1110 }
1111 
1112 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
1113 {
1114 	decode_configs(c);
1115 	switch (c->processor_id & PRID_IMP_MASK) {
1116 	case PRID_IMP_BMIPS32_REV4:
1117 	case PRID_IMP_BMIPS32_REV8:
1118 		c->cputype = CPU_BMIPS32;
1119 		__cpu_name[cpu] = "Broadcom BMIPS32";
1120 		set_elf_platform(cpu, "bmips32");
1121 		break;
1122 	case PRID_IMP_BMIPS3300:
1123 	case PRID_IMP_BMIPS3300_ALT:
1124 	case PRID_IMP_BMIPS3300_BUG:
1125 		c->cputype = CPU_BMIPS3300;
1126 		__cpu_name[cpu] = "Broadcom BMIPS3300";
1127 		set_elf_platform(cpu, "bmips3300");
1128 		break;
1129 	case PRID_IMP_BMIPS43XX: {
1130 		int rev = c->processor_id & PRID_REV_MASK;
1131 
1132 		if (rev >= PRID_REV_BMIPS4380_LO &&
1133 				rev <= PRID_REV_BMIPS4380_HI) {
1134 			c->cputype = CPU_BMIPS4380;
1135 			__cpu_name[cpu] = "Broadcom BMIPS4380";
1136 			set_elf_platform(cpu, "bmips4380");
1137 		} else {
1138 			c->cputype = CPU_BMIPS4350;
1139 			__cpu_name[cpu] = "Broadcom BMIPS4350";
1140 			set_elf_platform(cpu, "bmips4350");
1141 		}
1142 		break;
1143 	}
1144 	case PRID_IMP_BMIPS5000:
1145 	case PRID_IMP_BMIPS5200:
1146 		c->cputype = CPU_BMIPS5000;
1147 		__cpu_name[cpu] = "Broadcom BMIPS5000";
1148 		set_elf_platform(cpu, "bmips5000");
1149 		c->options |= MIPS_CPU_ULRI;
1150 		break;
1151 	}
1152 }
1153 
1154 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
1155 {
1156 	decode_configs(c);
1157 	switch (c->processor_id & PRID_IMP_MASK) {
1158 	case PRID_IMP_CAVIUM_CN38XX:
1159 	case PRID_IMP_CAVIUM_CN31XX:
1160 	case PRID_IMP_CAVIUM_CN30XX:
1161 		c->cputype = CPU_CAVIUM_OCTEON;
1162 		__cpu_name[cpu] = "Cavium Octeon";
1163 		goto platform;
1164 	case PRID_IMP_CAVIUM_CN58XX:
1165 	case PRID_IMP_CAVIUM_CN56XX:
1166 	case PRID_IMP_CAVIUM_CN50XX:
1167 	case PRID_IMP_CAVIUM_CN52XX:
1168 		c->cputype = CPU_CAVIUM_OCTEON_PLUS;
1169 		__cpu_name[cpu] = "Cavium Octeon+";
1170 platform:
1171 		set_elf_platform(cpu, "octeon");
1172 		break;
1173 	case PRID_IMP_CAVIUM_CN61XX:
1174 	case PRID_IMP_CAVIUM_CN63XX:
1175 	case PRID_IMP_CAVIUM_CN66XX:
1176 	case PRID_IMP_CAVIUM_CN68XX:
1177 	case PRID_IMP_CAVIUM_CNF71XX:
1178 		c->cputype = CPU_CAVIUM_OCTEON2;
1179 		__cpu_name[cpu] = "Cavium Octeon II";
1180 		set_elf_platform(cpu, "octeon2");
1181 		break;
1182 	case PRID_IMP_CAVIUM_CN70XX:
1183 	case PRID_IMP_CAVIUM_CN78XX:
1184 		c->cputype = CPU_CAVIUM_OCTEON3;
1185 		__cpu_name[cpu] = "Cavium Octeon III";
1186 		set_elf_platform(cpu, "octeon3");
1187 		break;
1188 	default:
1189 		printk(KERN_INFO "Unknown Octeon chip!\n");
1190 		c->cputype = CPU_UNKNOWN;
1191 		break;
1192 	}
1193 }
1194 
1195 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
1196 {
1197 	decode_configs(c);
1198 	/* JZRISC does not implement the CP0 counter. */
1199 	c->options &= ~MIPS_CPU_COUNTER;
1200 	BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
1201 	switch (c->processor_id & PRID_IMP_MASK) {
1202 	case PRID_IMP_JZRISC:
1203 		c->cputype = CPU_JZRISC;
1204 		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1205 		__cpu_name[cpu] = "Ingenic JZRISC";
1206 		break;
1207 	default:
1208 		panic("Unknown Ingenic Processor ID!");
1209 		break;
1210 	}
1211 }
1212 
1213 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
1214 {
1215 	decode_configs(c);
1216 
1217 	if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) {
1218 		c->cputype = CPU_ALCHEMY;
1219 		__cpu_name[cpu] = "Au1300";
1220 		/* following stuff is not for Alchemy */
1221 		return;
1222 	}
1223 
1224 	c->options = (MIPS_CPU_TLB	 |
1225 			MIPS_CPU_4KEX	 |
1226 			MIPS_CPU_COUNTER |
1227 			MIPS_CPU_DIVEC	 |
1228 			MIPS_CPU_WATCH	 |
1229 			MIPS_CPU_EJTAG	 |
1230 			MIPS_CPU_LLSC);
1231 
1232 	switch (c->processor_id & PRID_IMP_MASK) {
1233 	case PRID_IMP_NETLOGIC_XLP2XX:
1234 	case PRID_IMP_NETLOGIC_XLP9XX:
1235 	case PRID_IMP_NETLOGIC_XLP5XX:
1236 		c->cputype = CPU_XLP;
1237 		__cpu_name[cpu] = "Broadcom XLPII";
1238 		break;
1239 
1240 	case PRID_IMP_NETLOGIC_XLP8XX:
1241 	case PRID_IMP_NETLOGIC_XLP3XX:
1242 		c->cputype = CPU_XLP;
1243 		__cpu_name[cpu] = "Netlogic XLP";
1244 		break;
1245 
1246 	case PRID_IMP_NETLOGIC_XLR732:
1247 	case PRID_IMP_NETLOGIC_XLR716:
1248 	case PRID_IMP_NETLOGIC_XLR532:
1249 	case PRID_IMP_NETLOGIC_XLR308:
1250 	case PRID_IMP_NETLOGIC_XLR532C:
1251 	case PRID_IMP_NETLOGIC_XLR516C:
1252 	case PRID_IMP_NETLOGIC_XLR508C:
1253 	case PRID_IMP_NETLOGIC_XLR308C:
1254 		c->cputype = CPU_XLR;
1255 		__cpu_name[cpu] = "Netlogic XLR";
1256 		break;
1257 
1258 	case PRID_IMP_NETLOGIC_XLS608:
1259 	case PRID_IMP_NETLOGIC_XLS408:
1260 	case PRID_IMP_NETLOGIC_XLS404:
1261 	case PRID_IMP_NETLOGIC_XLS208:
1262 	case PRID_IMP_NETLOGIC_XLS204:
1263 	case PRID_IMP_NETLOGIC_XLS108:
1264 	case PRID_IMP_NETLOGIC_XLS104:
1265 	case PRID_IMP_NETLOGIC_XLS616B:
1266 	case PRID_IMP_NETLOGIC_XLS608B:
1267 	case PRID_IMP_NETLOGIC_XLS416B:
1268 	case PRID_IMP_NETLOGIC_XLS412B:
1269 	case PRID_IMP_NETLOGIC_XLS408B:
1270 	case PRID_IMP_NETLOGIC_XLS404B:
1271 		c->cputype = CPU_XLR;
1272 		__cpu_name[cpu] = "Netlogic XLS";
1273 		break;
1274 
1275 	default:
1276 		pr_info("Unknown Netlogic chip id [%02x]!\n",
1277 		       c->processor_id);
1278 		c->cputype = CPU_XLR;
1279 		break;
1280 	}
1281 
1282 	if (c->cputype == CPU_XLP) {
1283 		set_isa(c, MIPS_CPU_ISA_M64R2);
1284 		c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
1285 		/* This will be updated again after all threads are woken up */
1286 		c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
1287 	} else {
1288 		set_isa(c, MIPS_CPU_ISA_M64R1);
1289 		c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1290 	}
1291 	c->kscratch_mask = 0xf;
1292 }
1293 
1294 #ifdef CONFIG_64BIT
1295 /* For use by uaccess.h */
1296 u64 __ua_limit;
1297 EXPORT_SYMBOL(__ua_limit);
1298 #endif
1299 
1300 const char *__cpu_name[NR_CPUS];
1301 const char *__elf_platform;
1302 
1303 void cpu_probe(void)
1304 {
1305 	struct cpuinfo_mips *c = &current_cpu_data;
1306 	unsigned int cpu = smp_processor_id();
1307 
1308 	c->processor_id = PRID_IMP_UNKNOWN;
1309 	c->fpu_id	= FPIR_IMP_NONE;
1310 	c->cputype	= CPU_UNKNOWN;
1311 	c->writecombine = _CACHE_UNCACHED;
1312 
1313 	c->processor_id = read_c0_prid();
1314 	switch (c->processor_id & PRID_COMP_MASK) {
1315 	case PRID_COMP_LEGACY:
1316 		cpu_probe_legacy(c, cpu);
1317 		break;
1318 	case PRID_COMP_MIPS:
1319 		cpu_probe_mips(c, cpu);
1320 		break;
1321 	case PRID_COMP_ALCHEMY:
1322 		cpu_probe_alchemy(c, cpu);
1323 		break;
1324 	case PRID_COMP_SIBYTE:
1325 		cpu_probe_sibyte(c, cpu);
1326 		break;
1327 	case PRID_COMP_BROADCOM:
1328 		cpu_probe_broadcom(c, cpu);
1329 		break;
1330 	case PRID_COMP_SANDCRAFT:
1331 		cpu_probe_sandcraft(c, cpu);
1332 		break;
1333 	case PRID_COMP_NXP:
1334 		cpu_probe_nxp(c, cpu);
1335 		break;
1336 	case PRID_COMP_CAVIUM:
1337 		cpu_probe_cavium(c, cpu);
1338 		break;
1339 	case PRID_COMP_INGENIC:
1340 		cpu_probe_ingenic(c, cpu);
1341 		break;
1342 	case PRID_COMP_NETLOGIC:
1343 		cpu_probe_netlogic(c, cpu);
1344 		break;
1345 	}
1346 
1347 	BUG_ON(!__cpu_name[cpu]);
1348 	BUG_ON(c->cputype == CPU_UNKNOWN);
1349 
1350 	/*
1351 	 * Platform code can force the cpu type to optimize code
1352 	 * generation. In that case be sure the cpu type is correctly
1353 	 * manually setup otherwise it could trigger some nasty bugs.
1354 	 */
1355 	BUG_ON(current_cpu_type() != c->cputype);
1356 
1357 	if (mips_fpu_disabled)
1358 		c->options &= ~MIPS_CPU_FPU;
1359 
1360 	if (mips_dsp_disabled)
1361 		c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
1362 
1363 	if (mips_htw_disabled) {
1364 		c->options &= ~MIPS_CPU_HTW;
1365 		write_c0_pwctl(read_c0_pwctl() &
1366 			       ~(1 << MIPS_PWCTL_PWEN_SHIFT));
1367 	}
1368 
1369 	if (c->options & MIPS_CPU_FPU) {
1370 		c->fpu_id = cpu_get_fpu_id();
1371 
1372 		if (c->isa_level & cpu_has_mips_r) {
1373 			if (c->fpu_id & MIPS_FPIR_3D)
1374 				c->ases |= MIPS_ASE_MIPS3D;
1375 			if (c->fpu_id & MIPS_FPIR_FREP)
1376 				c->options |= MIPS_CPU_FRE;
1377 		}
1378 	}
1379 
1380 	if (cpu_has_mips_r2_r6) {
1381 		c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1382 		/* R2 has Performance Counter Interrupt indicator */
1383 		c->options |= MIPS_CPU_PCI;
1384 	}
1385 	else
1386 		c->srsets = 1;
1387 
1388 	if (cpu_has_msa) {
1389 		c->msa_id = cpu_get_msa_id();
1390 		WARN(c->msa_id & MSA_IR_WRPF,
1391 		     "Vector register partitioning unimplemented!");
1392 	}
1393 
1394 	cpu_probe_vmbits(c);
1395 
1396 #ifdef CONFIG_64BIT
1397 	if (cpu == 0)
1398 		__ua_limit = ~((1ull << cpu_vmbits) - 1);
1399 #endif
1400 }
1401 
1402 void cpu_report(void)
1403 {
1404 	struct cpuinfo_mips *c = &current_cpu_data;
1405 
1406 	pr_info("CPU%d revision is: %08x (%s)\n",
1407 		smp_processor_id(), c->processor_id, cpu_name_string());
1408 	if (c->options & MIPS_CPU_FPU)
1409 		printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1410 	if (cpu_has_msa)
1411 		pr_info("MSA revision is: %08x\n", c->msa_id);
1412 }
1413