xref: /linux/arch/mips/kernel/cpu-probe.c (revision 2dc0b9721956f4314364f68a99d8bef490870438)
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 inline void check_errata(void)
73 {
74 	struct cpuinfo_mips *c = &current_cpu_data;
75 
76 	switch (current_cpu_type()) {
77 	case CPU_34K:
78 		/*
79 		 * Erratum "RPS May Cause Incorrect Instruction Execution"
80 		 * This code only handles VPE0, any SMP/RTOS code
81 		 * making use of VPE1 will be responsable for that VPE.
82 		 */
83 		if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
84 			write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
85 		break;
86 	default:
87 		break;
88 	}
89 }
90 
91 void __init check_bugs32(void)
92 {
93 	check_errata();
94 }
95 
96 /*
97  * Probe whether cpu has config register by trying to play with
98  * alternate cache bit and see whether it matters.
99  * It's used by cpu_probe to distinguish between R3000A and R3081.
100  */
101 static inline int cpu_has_confreg(void)
102 {
103 #ifdef CONFIG_CPU_R3000
104 	extern unsigned long r3k_cache_size(unsigned long);
105 	unsigned long size1, size2;
106 	unsigned long cfg = read_c0_conf();
107 
108 	size1 = r3k_cache_size(ST0_ISC);
109 	write_c0_conf(cfg ^ R30XX_CONF_AC);
110 	size2 = r3k_cache_size(ST0_ISC);
111 	write_c0_conf(cfg);
112 	return size1 != size2;
113 #else
114 	return 0;
115 #endif
116 }
117 
118 static inline void set_elf_platform(int cpu, const char *plat)
119 {
120 	if (cpu == 0)
121 		__elf_platform = plat;
122 }
123 
124 /*
125  * Get the FPU Implementation/Revision.
126  */
127 static inline unsigned long cpu_get_fpu_id(void)
128 {
129 	unsigned long tmp, fpu_id;
130 
131 	tmp = read_c0_status();
132 	__enable_fpu(FPU_AS_IS);
133 	fpu_id = read_32bit_cp1_register(CP1_REVISION);
134 	write_c0_status(tmp);
135 	return fpu_id;
136 }
137 
138 /*
139  * Check the CPU has an FPU the official way.
140  */
141 static inline int __cpu_has_fpu(void)
142 {
143 	return ((cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE);
144 }
145 
146 static inline unsigned long cpu_get_msa_id(void)
147 {
148 	unsigned long status, msa_id;
149 
150 	status = read_c0_status();
151 	__enable_fpu(FPU_64BIT);
152 	enable_msa();
153 	msa_id = read_msa_ir();
154 	disable_msa();
155 	write_c0_status(status);
156 	return msa_id;
157 }
158 
159 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
160 {
161 #ifdef __NEED_VMBITS_PROBE
162 	write_c0_entryhi(0x3fffffffffffe000ULL);
163 	back_to_back_c0_hazard();
164 	c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
165 #endif
166 }
167 
168 static void set_isa(struct cpuinfo_mips *c, unsigned int isa)
169 {
170 	switch (isa) {
171 	case MIPS_CPU_ISA_M64R2:
172 		c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2;
173 	case MIPS_CPU_ISA_M64R1:
174 		c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1;
175 	case MIPS_CPU_ISA_V:
176 		c->isa_level |= MIPS_CPU_ISA_V;
177 	case MIPS_CPU_ISA_IV:
178 		c->isa_level |= MIPS_CPU_ISA_IV;
179 	case MIPS_CPU_ISA_III:
180 		c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III;
181 		break;
182 
183 	case MIPS_CPU_ISA_M32R2:
184 		c->isa_level |= MIPS_CPU_ISA_M32R2;
185 	case MIPS_CPU_ISA_M32R1:
186 		c->isa_level |= MIPS_CPU_ISA_M32R1;
187 	case MIPS_CPU_ISA_II:
188 		c->isa_level |= MIPS_CPU_ISA_II;
189 		break;
190 	}
191 }
192 
193 static char unknown_isa[] = KERN_ERR \
194 	"Unsupported ISA type, c0.config0: %d.";
195 
196 static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c)
197 {
198 
199 	unsigned int probability = c->tlbsize / c->tlbsizevtlb;
200 
201 	/*
202 	 * 0 = All TLBWR instructions go to FTLB
203 	 * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the
204 	 * FTLB and 1 goes to the VTLB.
205 	 * 2 = 7:1: As above with 7:1 ratio.
206 	 * 3 = 3:1: As above with 3:1 ratio.
207 	 *
208 	 * Use the linear midpoint as the probability threshold.
209 	 */
210 	if (probability >= 12)
211 		return 1;
212 	else if (probability >= 6)
213 		return 2;
214 	else
215 		/*
216 		 * So FTLB is less than 4 times bigger than VTLB.
217 		 * A 3:1 ratio can still be useful though.
218 		 */
219 		return 3;
220 }
221 
222 static void set_ftlb_enable(struct cpuinfo_mips *c, int enable)
223 {
224 	unsigned int config6;
225 
226 	/* It's implementation dependent how the FTLB can be enabled */
227 	switch (c->cputype) {
228 	case CPU_PROAPTIV:
229 	case CPU_P5600:
230 		/* proAptiv & related cores use Config6 to enable the FTLB */
231 		config6 = read_c0_config6();
232 		/* Clear the old probability value */
233 		config6 &= ~(3 << MIPS_CONF6_FTLBP_SHIFT);
234 		if (enable)
235 			/* Enable FTLB */
236 			write_c0_config6(config6 |
237 					 (calculate_ftlb_probability(c)
238 					  << MIPS_CONF6_FTLBP_SHIFT)
239 					 | MIPS_CONF6_FTLBEN);
240 		else
241 			/* Disable FTLB */
242 			write_c0_config6(config6 &  ~MIPS_CONF6_FTLBEN);
243 		back_to_back_c0_hazard();
244 		break;
245 	}
246 }
247 
248 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
249 {
250 	unsigned int config0;
251 	int isa;
252 
253 	config0 = read_c0_config();
254 
255 	/*
256 	 * Look for Standard TLB or Dual VTLB and FTLB
257 	 */
258 	if ((((config0 & MIPS_CONF_MT) >> 7) == 1) ||
259 	    (((config0 & MIPS_CONF_MT) >> 7) == 4))
260 		c->options |= MIPS_CPU_TLB;
261 
262 	isa = (config0 & MIPS_CONF_AT) >> 13;
263 	switch (isa) {
264 	case 0:
265 		switch ((config0 & MIPS_CONF_AR) >> 10) {
266 		case 0:
267 			set_isa(c, MIPS_CPU_ISA_M32R1);
268 			break;
269 		case 1:
270 			set_isa(c, MIPS_CPU_ISA_M32R2);
271 			break;
272 		default:
273 			goto unknown;
274 		}
275 		break;
276 	case 2:
277 		switch ((config0 & MIPS_CONF_AR) >> 10) {
278 		case 0:
279 			set_isa(c, MIPS_CPU_ISA_M64R1);
280 			break;
281 		case 1:
282 			set_isa(c, MIPS_CPU_ISA_M64R2);
283 			break;
284 		default:
285 			goto unknown;
286 		}
287 		break;
288 	default:
289 		goto unknown;
290 	}
291 
292 	return config0 & MIPS_CONF_M;
293 
294 unknown:
295 	panic(unknown_isa, config0);
296 }
297 
298 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
299 {
300 	unsigned int config1;
301 
302 	config1 = read_c0_config1();
303 
304 	if (config1 & MIPS_CONF1_MD)
305 		c->ases |= MIPS_ASE_MDMX;
306 	if (config1 & MIPS_CONF1_WR)
307 		c->options |= MIPS_CPU_WATCH;
308 	if (config1 & MIPS_CONF1_CA)
309 		c->ases |= MIPS_ASE_MIPS16;
310 	if (config1 & MIPS_CONF1_EP)
311 		c->options |= MIPS_CPU_EJTAG;
312 	if (config1 & MIPS_CONF1_FP) {
313 		c->options |= MIPS_CPU_FPU;
314 		c->options |= MIPS_CPU_32FPR;
315 	}
316 	if (cpu_has_tlb) {
317 		c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
318 		c->tlbsizevtlb = c->tlbsize;
319 		c->tlbsizeftlbsets = 0;
320 	}
321 
322 	return config1 & MIPS_CONF_M;
323 }
324 
325 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
326 {
327 	unsigned int config2;
328 
329 	config2 = read_c0_config2();
330 
331 	if (config2 & MIPS_CONF2_SL)
332 		c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
333 
334 	return config2 & MIPS_CONF_M;
335 }
336 
337 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
338 {
339 	unsigned int config3;
340 
341 	config3 = read_c0_config3();
342 
343 	if (config3 & MIPS_CONF3_SM) {
344 		c->ases |= MIPS_ASE_SMARTMIPS;
345 		c->options |= MIPS_CPU_RIXI;
346 	}
347 	if (config3 & MIPS_CONF3_RXI)
348 		c->options |= MIPS_CPU_RIXI;
349 	if (config3 & MIPS_CONF3_DSP)
350 		c->ases |= MIPS_ASE_DSP;
351 	if (config3 & MIPS_CONF3_DSP2P)
352 		c->ases |= MIPS_ASE_DSP2P;
353 	if (config3 & MIPS_CONF3_VINT)
354 		c->options |= MIPS_CPU_VINT;
355 	if (config3 & MIPS_CONF3_VEIC)
356 		c->options |= MIPS_CPU_VEIC;
357 	if (config3 & MIPS_CONF3_MT)
358 		c->ases |= MIPS_ASE_MIPSMT;
359 	if (config3 & MIPS_CONF3_ULRI)
360 		c->options |= MIPS_CPU_ULRI;
361 	if (config3 & MIPS_CONF3_ISA)
362 		c->options |= MIPS_CPU_MICROMIPS;
363 	if (config3 & MIPS_CONF3_VZ)
364 		c->ases |= MIPS_ASE_VZ;
365 	if (config3 & MIPS_CONF3_SC)
366 		c->options |= MIPS_CPU_SEGMENTS;
367 	if (config3 & MIPS_CONF3_MSA)
368 		c->ases |= MIPS_ASE_MSA;
369 	/* Only tested on 32-bit cores */
370 	if ((config3 & MIPS_CONF3_PW) && config_enabled(CONFIG_32BIT))
371 		c->options |= MIPS_CPU_HTW;
372 
373 	return config3 & MIPS_CONF_M;
374 }
375 
376 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
377 {
378 	unsigned int config4;
379 	unsigned int newcf4;
380 	unsigned int mmuextdef;
381 	unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
382 
383 	config4 = read_c0_config4();
384 
385 	if (cpu_has_tlb) {
386 		if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
387 			c->options |= MIPS_CPU_TLBINV;
388 		mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
389 		switch (mmuextdef) {
390 		case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
391 			c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
392 			c->tlbsizevtlb = c->tlbsize;
393 			break;
394 		case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
395 			c->tlbsizevtlb +=
396 				((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
397 				  MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
398 			c->tlbsize = c->tlbsizevtlb;
399 			ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
400 			/* fall through */
401 		case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
402 			newcf4 = (config4 & ~ftlb_page) |
403 				(page_size_ftlb(mmuextdef) <<
404 				 MIPS_CONF4_FTLBPAGESIZE_SHIFT);
405 			write_c0_config4(newcf4);
406 			back_to_back_c0_hazard();
407 			config4 = read_c0_config4();
408 			if (config4 != newcf4) {
409 				pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
410 				       PAGE_SIZE, config4);
411 				/* Switch FTLB off */
412 				set_ftlb_enable(c, 0);
413 				break;
414 			}
415 			c->tlbsizeftlbsets = 1 <<
416 				((config4 & MIPS_CONF4_FTLBSETS) >>
417 				 MIPS_CONF4_FTLBSETS_SHIFT);
418 			c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
419 					      MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
420 			c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
421 			break;
422 		}
423 	}
424 
425 	c->kscratch_mask = (config4 >> 16) & 0xff;
426 
427 	return config4 & MIPS_CONF_M;
428 }
429 
430 static inline unsigned int decode_config5(struct cpuinfo_mips *c)
431 {
432 	unsigned int config5;
433 
434 	config5 = read_c0_config5();
435 	config5 &= ~MIPS_CONF5_UFR;
436 	write_c0_config5(config5);
437 
438 	if (config5 & MIPS_CONF5_EVA)
439 		c->options |= MIPS_CPU_EVA;
440 	if (config5 & MIPS_CONF5_MRP)
441 		c->options |= MIPS_CPU_MAAR;
442 
443 	return config5 & MIPS_CONF_M;
444 }
445 
446 static void decode_configs(struct cpuinfo_mips *c)
447 {
448 	int ok;
449 
450 	/* MIPS32 or MIPS64 compliant CPU.  */
451 	c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
452 		     MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
453 
454 	c->scache.flags = MIPS_CACHE_NOT_PRESENT;
455 
456 	/* Enable FTLB if present */
457 	set_ftlb_enable(c, 1);
458 
459 	ok = decode_config0(c);			/* Read Config registers.  */
460 	BUG_ON(!ok);				/* Arch spec violation!	 */
461 	if (ok)
462 		ok = decode_config1(c);
463 	if (ok)
464 		ok = decode_config2(c);
465 	if (ok)
466 		ok = decode_config3(c);
467 	if (ok)
468 		ok = decode_config4(c);
469 	if (ok)
470 		ok = decode_config5(c);
471 
472 	mips_probe_watch_registers(c);
473 
474 	if (cpu_has_rixi) {
475 		/* Enable the RIXI exceptions */
476 		write_c0_pagegrain(read_c0_pagegrain() | PG_IEC);
477 		back_to_back_c0_hazard();
478 		/* Verify the IEC bit is set */
479 		if (read_c0_pagegrain() & PG_IEC)
480 			c->options |= MIPS_CPU_RIXIEX;
481 	}
482 
483 #ifndef CONFIG_MIPS_CPS
484 	if (cpu_has_mips_r2) {
485 		c->core = get_ebase_cpunum();
486 		if (cpu_has_mipsmt)
487 			c->core >>= fls(core_nvpes()) - 1;
488 	}
489 #endif
490 }
491 
492 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
493 		| MIPS_CPU_COUNTER)
494 
495 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
496 {
497 	switch (c->processor_id & PRID_IMP_MASK) {
498 	case PRID_IMP_R2000:
499 		c->cputype = CPU_R2000;
500 		__cpu_name[cpu] = "R2000";
501 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
502 			     MIPS_CPU_NOFPUEX;
503 		if (__cpu_has_fpu())
504 			c->options |= MIPS_CPU_FPU;
505 		c->tlbsize = 64;
506 		break;
507 	case PRID_IMP_R3000:
508 		if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
509 			if (cpu_has_confreg()) {
510 				c->cputype = CPU_R3081E;
511 				__cpu_name[cpu] = "R3081";
512 			} else {
513 				c->cputype = CPU_R3000A;
514 				__cpu_name[cpu] = "R3000A";
515 			}
516 		} else {
517 			c->cputype = CPU_R3000;
518 			__cpu_name[cpu] = "R3000";
519 		}
520 		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
521 			     MIPS_CPU_NOFPUEX;
522 		if (__cpu_has_fpu())
523 			c->options |= MIPS_CPU_FPU;
524 		c->tlbsize = 64;
525 		break;
526 	case PRID_IMP_R4000:
527 		if (read_c0_config() & CONF_SC) {
528 			if ((c->processor_id & PRID_REV_MASK) >=
529 			    PRID_REV_R4400) {
530 				c->cputype = CPU_R4400PC;
531 				__cpu_name[cpu] = "R4400PC";
532 			} else {
533 				c->cputype = CPU_R4000PC;
534 				__cpu_name[cpu] = "R4000PC";
535 			}
536 		} else {
537 			int cca = read_c0_config() & CONF_CM_CMASK;
538 			int mc;
539 
540 			/*
541 			 * SC and MC versions can't be reliably told apart,
542 			 * but only the latter support coherent caching
543 			 * modes so assume the firmware has set the KSEG0
544 			 * coherency attribute reasonably (if uncached, we
545 			 * assume SC).
546 			 */
547 			switch (cca) {
548 			case CONF_CM_CACHABLE_CE:
549 			case CONF_CM_CACHABLE_COW:
550 			case CONF_CM_CACHABLE_CUW:
551 				mc = 1;
552 				break;
553 			default:
554 				mc = 0;
555 				break;
556 			}
557 			if ((c->processor_id & PRID_REV_MASK) >=
558 			    PRID_REV_R4400) {
559 				c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
560 				__cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
561 			} else {
562 				c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
563 				__cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
564 			}
565 		}
566 
567 		set_isa(c, MIPS_CPU_ISA_III);
568 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
569 			     MIPS_CPU_WATCH | MIPS_CPU_VCE |
570 			     MIPS_CPU_LLSC;
571 		c->tlbsize = 48;
572 		break;
573 	case PRID_IMP_VR41XX:
574 		set_isa(c, MIPS_CPU_ISA_III);
575 		c->options = R4K_OPTS;
576 		c->tlbsize = 32;
577 		switch (c->processor_id & 0xf0) {
578 		case PRID_REV_VR4111:
579 			c->cputype = CPU_VR4111;
580 			__cpu_name[cpu] = "NEC VR4111";
581 			break;
582 		case PRID_REV_VR4121:
583 			c->cputype = CPU_VR4121;
584 			__cpu_name[cpu] = "NEC VR4121";
585 			break;
586 		case PRID_REV_VR4122:
587 			if ((c->processor_id & 0xf) < 0x3) {
588 				c->cputype = CPU_VR4122;
589 				__cpu_name[cpu] = "NEC VR4122";
590 			} else {
591 				c->cputype = CPU_VR4181A;
592 				__cpu_name[cpu] = "NEC VR4181A";
593 			}
594 			break;
595 		case PRID_REV_VR4130:
596 			if ((c->processor_id & 0xf) < 0x4) {
597 				c->cputype = CPU_VR4131;
598 				__cpu_name[cpu] = "NEC VR4131";
599 			} else {
600 				c->cputype = CPU_VR4133;
601 				c->options |= MIPS_CPU_LLSC;
602 				__cpu_name[cpu] = "NEC VR4133";
603 			}
604 			break;
605 		default:
606 			printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
607 			c->cputype = CPU_VR41XX;
608 			__cpu_name[cpu] = "NEC Vr41xx";
609 			break;
610 		}
611 		break;
612 	case PRID_IMP_R4300:
613 		c->cputype = CPU_R4300;
614 		__cpu_name[cpu] = "R4300";
615 		set_isa(c, MIPS_CPU_ISA_III);
616 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
617 			     MIPS_CPU_LLSC;
618 		c->tlbsize = 32;
619 		break;
620 	case PRID_IMP_R4600:
621 		c->cputype = CPU_R4600;
622 		__cpu_name[cpu] = "R4600";
623 		set_isa(c, MIPS_CPU_ISA_III);
624 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
625 			     MIPS_CPU_LLSC;
626 		c->tlbsize = 48;
627 		break;
628 	#if 0
629 	case PRID_IMP_R4650:
630 		/*
631 		 * This processor doesn't have an MMU, so it's not
632 		 * "real easy" to run Linux on it. It is left purely
633 		 * for documentation.  Commented out because it shares
634 		 * it's c0_prid id number with the TX3900.
635 		 */
636 		c->cputype = CPU_R4650;
637 		__cpu_name[cpu] = "R4650";
638 		set_isa(c, MIPS_CPU_ISA_III);
639 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
640 		c->tlbsize = 48;
641 		break;
642 	#endif
643 	case PRID_IMP_TX39:
644 		c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
645 
646 		if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
647 			c->cputype = CPU_TX3927;
648 			__cpu_name[cpu] = "TX3927";
649 			c->tlbsize = 64;
650 		} else {
651 			switch (c->processor_id & PRID_REV_MASK) {
652 			case PRID_REV_TX3912:
653 				c->cputype = CPU_TX3912;
654 				__cpu_name[cpu] = "TX3912";
655 				c->tlbsize = 32;
656 				break;
657 			case PRID_REV_TX3922:
658 				c->cputype = CPU_TX3922;
659 				__cpu_name[cpu] = "TX3922";
660 				c->tlbsize = 64;
661 				break;
662 			}
663 		}
664 		break;
665 	case PRID_IMP_R4700:
666 		c->cputype = CPU_R4700;
667 		__cpu_name[cpu] = "R4700";
668 		set_isa(c, MIPS_CPU_ISA_III);
669 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
670 			     MIPS_CPU_LLSC;
671 		c->tlbsize = 48;
672 		break;
673 	case PRID_IMP_TX49:
674 		c->cputype = CPU_TX49XX;
675 		__cpu_name[cpu] = "R49XX";
676 		set_isa(c, MIPS_CPU_ISA_III);
677 		c->options = R4K_OPTS | MIPS_CPU_LLSC;
678 		if (!(c->processor_id & 0x08))
679 			c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
680 		c->tlbsize = 48;
681 		break;
682 	case PRID_IMP_R5000:
683 		c->cputype = CPU_R5000;
684 		__cpu_name[cpu] = "R5000";
685 		set_isa(c, MIPS_CPU_ISA_IV);
686 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
687 			     MIPS_CPU_LLSC;
688 		c->tlbsize = 48;
689 		break;
690 	case PRID_IMP_R5432:
691 		c->cputype = CPU_R5432;
692 		__cpu_name[cpu] = "R5432";
693 		set_isa(c, MIPS_CPU_ISA_IV);
694 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
695 			     MIPS_CPU_WATCH | MIPS_CPU_LLSC;
696 		c->tlbsize = 48;
697 		break;
698 	case PRID_IMP_R5500:
699 		c->cputype = CPU_R5500;
700 		__cpu_name[cpu] = "R5500";
701 		set_isa(c, MIPS_CPU_ISA_IV);
702 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
703 			     MIPS_CPU_WATCH | MIPS_CPU_LLSC;
704 		c->tlbsize = 48;
705 		break;
706 	case PRID_IMP_NEVADA:
707 		c->cputype = CPU_NEVADA;
708 		__cpu_name[cpu] = "Nevada";
709 		set_isa(c, MIPS_CPU_ISA_IV);
710 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
711 			     MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
712 		c->tlbsize = 48;
713 		break;
714 	case PRID_IMP_R6000:
715 		c->cputype = CPU_R6000;
716 		__cpu_name[cpu] = "R6000";
717 		set_isa(c, MIPS_CPU_ISA_II);
718 		c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
719 			     MIPS_CPU_LLSC;
720 		c->tlbsize = 32;
721 		break;
722 	case PRID_IMP_R6000A:
723 		c->cputype = CPU_R6000A;
724 		__cpu_name[cpu] = "R6000A";
725 		set_isa(c, MIPS_CPU_ISA_II);
726 		c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
727 			     MIPS_CPU_LLSC;
728 		c->tlbsize = 32;
729 		break;
730 	case PRID_IMP_RM7000:
731 		c->cputype = CPU_RM7000;
732 		__cpu_name[cpu] = "RM7000";
733 		set_isa(c, MIPS_CPU_ISA_IV);
734 		c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
735 			     MIPS_CPU_LLSC;
736 		/*
737 		 * Undocumented RM7000:	 Bit 29 in the info register of
738 		 * the RM7000 v2.0 indicates if the TLB has 48 or 64
739 		 * entries.
740 		 *
741 		 * 29	   1 =>	   64 entry JTLB
742 		 *	   0 =>	   48 entry JTLB
743 		 */
744 		c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
745 		break;
746 	case PRID_IMP_R8000:
747 		c->cputype = CPU_R8000;
748 		__cpu_name[cpu] = "RM8000";
749 		set_isa(c, MIPS_CPU_ISA_IV);
750 		c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
751 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
752 			     MIPS_CPU_LLSC;
753 		c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
754 		break;
755 	case PRID_IMP_R10000:
756 		c->cputype = CPU_R10000;
757 		__cpu_name[cpu] = "R10000";
758 		set_isa(c, MIPS_CPU_ISA_IV);
759 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
760 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
761 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
762 			     MIPS_CPU_LLSC;
763 		c->tlbsize = 64;
764 		break;
765 	case PRID_IMP_R12000:
766 		c->cputype = CPU_R12000;
767 		__cpu_name[cpu] = "R12000";
768 		set_isa(c, MIPS_CPU_ISA_IV);
769 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
770 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
771 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
772 			     MIPS_CPU_LLSC;
773 		c->tlbsize = 64;
774 		break;
775 	case PRID_IMP_R14000:
776 		c->cputype = CPU_R14000;
777 		__cpu_name[cpu] = "R14000";
778 		set_isa(c, MIPS_CPU_ISA_IV);
779 		c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
780 			     MIPS_CPU_FPU | MIPS_CPU_32FPR |
781 			     MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
782 			     MIPS_CPU_LLSC;
783 		c->tlbsize = 64;
784 		break;
785 	case PRID_IMP_LOONGSON_64:  /* Loongson-2/3 */
786 		switch (c->processor_id & PRID_REV_MASK) {
787 		case PRID_REV_LOONGSON2E:
788 			c->cputype = CPU_LOONGSON2;
789 			__cpu_name[cpu] = "ICT Loongson-2";
790 			set_elf_platform(cpu, "loongson2e");
791 			set_isa(c, MIPS_CPU_ISA_III);
792 			break;
793 		case PRID_REV_LOONGSON2F:
794 			c->cputype = CPU_LOONGSON2;
795 			__cpu_name[cpu] = "ICT Loongson-2";
796 			set_elf_platform(cpu, "loongson2f");
797 			set_isa(c, MIPS_CPU_ISA_III);
798 			break;
799 		case PRID_REV_LOONGSON3A:
800 			c->cputype = CPU_LOONGSON3;
801 			__cpu_name[cpu] = "ICT Loongson-3";
802 			set_elf_platform(cpu, "loongson3a");
803 			set_isa(c, MIPS_CPU_ISA_M64R1);
804 			break;
805 		case PRID_REV_LOONGSON3B_R1:
806 		case PRID_REV_LOONGSON3B_R2:
807 			c->cputype = CPU_LOONGSON3;
808 			__cpu_name[cpu] = "ICT Loongson-3";
809 			set_elf_platform(cpu, "loongson3b");
810 			set_isa(c, MIPS_CPU_ISA_M64R1);
811 			break;
812 		}
813 
814 		c->options = R4K_OPTS |
815 			     MIPS_CPU_FPU | MIPS_CPU_LLSC |
816 			     MIPS_CPU_32FPR;
817 		c->tlbsize = 64;
818 		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
819 		break;
820 	case PRID_IMP_LOONGSON_32:  /* Loongson-1 */
821 		decode_configs(c);
822 
823 		c->cputype = CPU_LOONGSON1;
824 
825 		switch (c->processor_id & PRID_REV_MASK) {
826 		case PRID_REV_LOONGSON1B:
827 			__cpu_name[cpu] = "Loongson 1B";
828 			break;
829 		}
830 
831 		break;
832 	}
833 }
834 
835 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
836 {
837 	c->writecombine = _CACHE_UNCACHED_ACCELERATED;
838 	switch (c->processor_id & PRID_IMP_MASK) {
839 	case PRID_IMP_4KC:
840 		c->cputype = CPU_4KC;
841 		c->writecombine = _CACHE_UNCACHED;
842 		__cpu_name[cpu] = "MIPS 4Kc";
843 		break;
844 	case PRID_IMP_4KEC:
845 	case PRID_IMP_4KECR2:
846 		c->cputype = CPU_4KEC;
847 		c->writecombine = _CACHE_UNCACHED;
848 		__cpu_name[cpu] = "MIPS 4KEc";
849 		break;
850 	case PRID_IMP_4KSC:
851 	case PRID_IMP_4KSD:
852 		c->cputype = CPU_4KSC;
853 		c->writecombine = _CACHE_UNCACHED;
854 		__cpu_name[cpu] = "MIPS 4KSc";
855 		break;
856 	case PRID_IMP_5KC:
857 		c->cputype = CPU_5KC;
858 		c->writecombine = _CACHE_UNCACHED;
859 		__cpu_name[cpu] = "MIPS 5Kc";
860 		break;
861 	case PRID_IMP_5KE:
862 		c->cputype = CPU_5KE;
863 		c->writecombine = _CACHE_UNCACHED;
864 		__cpu_name[cpu] = "MIPS 5KE";
865 		break;
866 	case PRID_IMP_20KC:
867 		c->cputype = CPU_20KC;
868 		c->writecombine = _CACHE_UNCACHED;
869 		__cpu_name[cpu] = "MIPS 20Kc";
870 		break;
871 	case PRID_IMP_24K:
872 		c->cputype = CPU_24K;
873 		c->writecombine = _CACHE_UNCACHED;
874 		__cpu_name[cpu] = "MIPS 24Kc";
875 		break;
876 	case PRID_IMP_24KE:
877 		c->cputype = CPU_24K;
878 		c->writecombine = _CACHE_UNCACHED;
879 		__cpu_name[cpu] = "MIPS 24KEc";
880 		break;
881 	case PRID_IMP_25KF:
882 		c->cputype = CPU_25KF;
883 		c->writecombine = _CACHE_UNCACHED;
884 		__cpu_name[cpu] = "MIPS 25Kc";
885 		break;
886 	case PRID_IMP_34K:
887 		c->cputype = CPU_34K;
888 		c->writecombine = _CACHE_UNCACHED;
889 		__cpu_name[cpu] = "MIPS 34Kc";
890 		break;
891 	case PRID_IMP_74K:
892 		c->cputype = CPU_74K;
893 		c->writecombine = _CACHE_UNCACHED;
894 		__cpu_name[cpu] = "MIPS 74Kc";
895 		break;
896 	case PRID_IMP_M14KC:
897 		c->cputype = CPU_M14KC;
898 		c->writecombine = _CACHE_UNCACHED;
899 		__cpu_name[cpu] = "MIPS M14Kc";
900 		break;
901 	case PRID_IMP_M14KEC:
902 		c->cputype = CPU_M14KEC;
903 		c->writecombine = _CACHE_UNCACHED;
904 		__cpu_name[cpu] = "MIPS M14KEc";
905 		break;
906 	case PRID_IMP_1004K:
907 		c->cputype = CPU_1004K;
908 		c->writecombine = _CACHE_UNCACHED;
909 		__cpu_name[cpu] = "MIPS 1004Kc";
910 		break;
911 	case PRID_IMP_1074K:
912 		c->cputype = CPU_1074K;
913 		c->writecombine = _CACHE_UNCACHED;
914 		__cpu_name[cpu] = "MIPS 1074Kc";
915 		break;
916 	case PRID_IMP_INTERAPTIV_UP:
917 		c->cputype = CPU_INTERAPTIV;
918 		__cpu_name[cpu] = "MIPS interAptiv";
919 		break;
920 	case PRID_IMP_INTERAPTIV_MP:
921 		c->cputype = CPU_INTERAPTIV;
922 		__cpu_name[cpu] = "MIPS interAptiv (multi)";
923 		break;
924 	case PRID_IMP_PROAPTIV_UP:
925 		c->cputype = CPU_PROAPTIV;
926 		__cpu_name[cpu] = "MIPS proAptiv";
927 		break;
928 	case PRID_IMP_PROAPTIV_MP:
929 		c->cputype = CPU_PROAPTIV;
930 		__cpu_name[cpu] = "MIPS proAptiv (multi)";
931 		break;
932 	case PRID_IMP_P5600:
933 		c->cputype = CPU_P5600;
934 		__cpu_name[cpu] = "MIPS P5600";
935 		break;
936 	case PRID_IMP_M5150:
937 		c->cputype = CPU_M5150;
938 		__cpu_name[cpu] = "MIPS M5150";
939 		break;
940 	}
941 
942 	decode_configs(c);
943 
944 	spram_config();
945 }
946 
947 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
948 {
949 	decode_configs(c);
950 	switch (c->processor_id & PRID_IMP_MASK) {
951 	case PRID_IMP_AU1_REV1:
952 	case PRID_IMP_AU1_REV2:
953 		c->cputype = CPU_ALCHEMY;
954 		switch ((c->processor_id >> 24) & 0xff) {
955 		case 0:
956 			__cpu_name[cpu] = "Au1000";
957 			break;
958 		case 1:
959 			__cpu_name[cpu] = "Au1500";
960 			break;
961 		case 2:
962 			__cpu_name[cpu] = "Au1100";
963 			break;
964 		case 3:
965 			__cpu_name[cpu] = "Au1550";
966 			break;
967 		case 4:
968 			__cpu_name[cpu] = "Au1200";
969 			if ((c->processor_id & PRID_REV_MASK) == 2)
970 				__cpu_name[cpu] = "Au1250";
971 			break;
972 		case 5:
973 			__cpu_name[cpu] = "Au1210";
974 			break;
975 		default:
976 			__cpu_name[cpu] = "Au1xxx";
977 			break;
978 		}
979 		break;
980 	}
981 }
982 
983 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
984 {
985 	decode_configs(c);
986 
987 	c->writecombine = _CACHE_UNCACHED_ACCELERATED;
988 	switch (c->processor_id & PRID_IMP_MASK) {
989 	case PRID_IMP_SB1:
990 		c->cputype = CPU_SB1;
991 		__cpu_name[cpu] = "SiByte SB1";
992 		/* FPU in pass1 is known to have issues. */
993 		if ((c->processor_id & PRID_REV_MASK) < 0x02)
994 			c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
995 		break;
996 	case PRID_IMP_SB1A:
997 		c->cputype = CPU_SB1A;
998 		__cpu_name[cpu] = "SiByte SB1A";
999 		break;
1000 	}
1001 }
1002 
1003 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
1004 {
1005 	decode_configs(c);
1006 	switch (c->processor_id & PRID_IMP_MASK) {
1007 	case PRID_IMP_SR71000:
1008 		c->cputype = CPU_SR71000;
1009 		__cpu_name[cpu] = "Sandcraft SR71000";
1010 		c->scache.ways = 8;
1011 		c->tlbsize = 64;
1012 		break;
1013 	}
1014 }
1015 
1016 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
1017 {
1018 	decode_configs(c);
1019 	switch (c->processor_id & PRID_IMP_MASK) {
1020 	case PRID_IMP_PR4450:
1021 		c->cputype = CPU_PR4450;
1022 		__cpu_name[cpu] = "Philips PR4450";
1023 		set_isa(c, MIPS_CPU_ISA_M32R1);
1024 		break;
1025 	}
1026 }
1027 
1028 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
1029 {
1030 	decode_configs(c);
1031 	switch (c->processor_id & PRID_IMP_MASK) {
1032 	case PRID_IMP_BMIPS32_REV4:
1033 	case PRID_IMP_BMIPS32_REV8:
1034 		c->cputype = CPU_BMIPS32;
1035 		__cpu_name[cpu] = "Broadcom BMIPS32";
1036 		set_elf_platform(cpu, "bmips32");
1037 		break;
1038 	case PRID_IMP_BMIPS3300:
1039 	case PRID_IMP_BMIPS3300_ALT:
1040 	case PRID_IMP_BMIPS3300_BUG:
1041 		c->cputype = CPU_BMIPS3300;
1042 		__cpu_name[cpu] = "Broadcom BMIPS3300";
1043 		set_elf_platform(cpu, "bmips3300");
1044 		break;
1045 	case PRID_IMP_BMIPS43XX: {
1046 		int rev = c->processor_id & PRID_REV_MASK;
1047 
1048 		if (rev >= PRID_REV_BMIPS4380_LO &&
1049 				rev <= PRID_REV_BMIPS4380_HI) {
1050 			c->cputype = CPU_BMIPS4380;
1051 			__cpu_name[cpu] = "Broadcom BMIPS4380";
1052 			set_elf_platform(cpu, "bmips4380");
1053 		} else {
1054 			c->cputype = CPU_BMIPS4350;
1055 			__cpu_name[cpu] = "Broadcom BMIPS4350";
1056 			set_elf_platform(cpu, "bmips4350");
1057 		}
1058 		break;
1059 	}
1060 	case PRID_IMP_BMIPS5000:
1061 		c->cputype = CPU_BMIPS5000;
1062 		__cpu_name[cpu] = "Broadcom BMIPS5000";
1063 		set_elf_platform(cpu, "bmips5000");
1064 		c->options |= MIPS_CPU_ULRI;
1065 		break;
1066 	}
1067 }
1068 
1069 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
1070 {
1071 	decode_configs(c);
1072 	switch (c->processor_id & PRID_IMP_MASK) {
1073 	case PRID_IMP_CAVIUM_CN38XX:
1074 	case PRID_IMP_CAVIUM_CN31XX:
1075 	case PRID_IMP_CAVIUM_CN30XX:
1076 		c->cputype = CPU_CAVIUM_OCTEON;
1077 		__cpu_name[cpu] = "Cavium Octeon";
1078 		goto platform;
1079 	case PRID_IMP_CAVIUM_CN58XX:
1080 	case PRID_IMP_CAVIUM_CN56XX:
1081 	case PRID_IMP_CAVIUM_CN50XX:
1082 	case PRID_IMP_CAVIUM_CN52XX:
1083 		c->cputype = CPU_CAVIUM_OCTEON_PLUS;
1084 		__cpu_name[cpu] = "Cavium Octeon+";
1085 platform:
1086 		set_elf_platform(cpu, "octeon");
1087 		break;
1088 	case PRID_IMP_CAVIUM_CN61XX:
1089 	case PRID_IMP_CAVIUM_CN63XX:
1090 	case PRID_IMP_CAVIUM_CN66XX:
1091 	case PRID_IMP_CAVIUM_CN68XX:
1092 	case PRID_IMP_CAVIUM_CNF71XX:
1093 		c->cputype = CPU_CAVIUM_OCTEON2;
1094 		__cpu_name[cpu] = "Cavium Octeon II";
1095 		set_elf_platform(cpu, "octeon2");
1096 		break;
1097 	case PRID_IMP_CAVIUM_CN70XX:
1098 	case PRID_IMP_CAVIUM_CN78XX:
1099 		c->cputype = CPU_CAVIUM_OCTEON3;
1100 		__cpu_name[cpu] = "Cavium Octeon III";
1101 		set_elf_platform(cpu, "octeon3");
1102 		break;
1103 	default:
1104 		printk(KERN_INFO "Unknown Octeon chip!\n");
1105 		c->cputype = CPU_UNKNOWN;
1106 		break;
1107 	}
1108 }
1109 
1110 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
1111 {
1112 	decode_configs(c);
1113 	/* JZRISC does not implement the CP0 counter. */
1114 	c->options &= ~MIPS_CPU_COUNTER;
1115 	BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
1116 	switch (c->processor_id & PRID_IMP_MASK) {
1117 	case PRID_IMP_JZRISC:
1118 		c->cputype = CPU_JZRISC;
1119 		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1120 		__cpu_name[cpu] = "Ingenic JZRISC";
1121 		break;
1122 	default:
1123 		panic("Unknown Ingenic Processor ID!");
1124 		break;
1125 	}
1126 }
1127 
1128 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
1129 {
1130 	decode_configs(c);
1131 
1132 	if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) {
1133 		c->cputype = CPU_ALCHEMY;
1134 		__cpu_name[cpu] = "Au1300";
1135 		/* following stuff is not for Alchemy */
1136 		return;
1137 	}
1138 
1139 	c->options = (MIPS_CPU_TLB	 |
1140 			MIPS_CPU_4KEX	 |
1141 			MIPS_CPU_COUNTER |
1142 			MIPS_CPU_DIVEC	 |
1143 			MIPS_CPU_WATCH	 |
1144 			MIPS_CPU_EJTAG	 |
1145 			MIPS_CPU_LLSC);
1146 
1147 	switch (c->processor_id & PRID_IMP_MASK) {
1148 	case PRID_IMP_NETLOGIC_XLP2XX:
1149 	case PRID_IMP_NETLOGIC_XLP9XX:
1150 	case PRID_IMP_NETLOGIC_XLP5XX:
1151 		c->cputype = CPU_XLP;
1152 		__cpu_name[cpu] = "Broadcom XLPII";
1153 		break;
1154 
1155 	case PRID_IMP_NETLOGIC_XLP8XX:
1156 	case PRID_IMP_NETLOGIC_XLP3XX:
1157 		c->cputype = CPU_XLP;
1158 		__cpu_name[cpu] = "Netlogic XLP";
1159 		break;
1160 
1161 	case PRID_IMP_NETLOGIC_XLR732:
1162 	case PRID_IMP_NETLOGIC_XLR716:
1163 	case PRID_IMP_NETLOGIC_XLR532:
1164 	case PRID_IMP_NETLOGIC_XLR308:
1165 	case PRID_IMP_NETLOGIC_XLR532C:
1166 	case PRID_IMP_NETLOGIC_XLR516C:
1167 	case PRID_IMP_NETLOGIC_XLR508C:
1168 	case PRID_IMP_NETLOGIC_XLR308C:
1169 		c->cputype = CPU_XLR;
1170 		__cpu_name[cpu] = "Netlogic XLR";
1171 		break;
1172 
1173 	case PRID_IMP_NETLOGIC_XLS608:
1174 	case PRID_IMP_NETLOGIC_XLS408:
1175 	case PRID_IMP_NETLOGIC_XLS404:
1176 	case PRID_IMP_NETLOGIC_XLS208:
1177 	case PRID_IMP_NETLOGIC_XLS204:
1178 	case PRID_IMP_NETLOGIC_XLS108:
1179 	case PRID_IMP_NETLOGIC_XLS104:
1180 	case PRID_IMP_NETLOGIC_XLS616B:
1181 	case PRID_IMP_NETLOGIC_XLS608B:
1182 	case PRID_IMP_NETLOGIC_XLS416B:
1183 	case PRID_IMP_NETLOGIC_XLS412B:
1184 	case PRID_IMP_NETLOGIC_XLS408B:
1185 	case PRID_IMP_NETLOGIC_XLS404B:
1186 		c->cputype = CPU_XLR;
1187 		__cpu_name[cpu] = "Netlogic XLS";
1188 		break;
1189 
1190 	default:
1191 		pr_info("Unknown Netlogic chip id [%02x]!\n",
1192 		       c->processor_id);
1193 		c->cputype = CPU_XLR;
1194 		break;
1195 	}
1196 
1197 	if (c->cputype == CPU_XLP) {
1198 		set_isa(c, MIPS_CPU_ISA_M64R2);
1199 		c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
1200 		/* This will be updated again after all threads are woken up */
1201 		c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
1202 	} else {
1203 		set_isa(c, MIPS_CPU_ISA_M64R1);
1204 		c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1205 	}
1206 	c->kscratch_mask = 0xf;
1207 }
1208 
1209 #ifdef CONFIG_64BIT
1210 /* For use by uaccess.h */
1211 u64 __ua_limit;
1212 EXPORT_SYMBOL(__ua_limit);
1213 #endif
1214 
1215 const char *__cpu_name[NR_CPUS];
1216 const char *__elf_platform;
1217 
1218 void cpu_probe(void)
1219 {
1220 	struct cpuinfo_mips *c = &current_cpu_data;
1221 	unsigned int cpu = smp_processor_id();
1222 
1223 	c->processor_id = PRID_IMP_UNKNOWN;
1224 	c->fpu_id	= FPIR_IMP_NONE;
1225 	c->cputype	= CPU_UNKNOWN;
1226 	c->writecombine = _CACHE_UNCACHED;
1227 
1228 	c->processor_id = read_c0_prid();
1229 	switch (c->processor_id & PRID_COMP_MASK) {
1230 	case PRID_COMP_LEGACY:
1231 		cpu_probe_legacy(c, cpu);
1232 		break;
1233 	case PRID_COMP_MIPS:
1234 		cpu_probe_mips(c, cpu);
1235 		break;
1236 	case PRID_COMP_ALCHEMY:
1237 		cpu_probe_alchemy(c, cpu);
1238 		break;
1239 	case PRID_COMP_SIBYTE:
1240 		cpu_probe_sibyte(c, cpu);
1241 		break;
1242 	case PRID_COMP_BROADCOM:
1243 		cpu_probe_broadcom(c, cpu);
1244 		break;
1245 	case PRID_COMP_SANDCRAFT:
1246 		cpu_probe_sandcraft(c, cpu);
1247 		break;
1248 	case PRID_COMP_NXP:
1249 		cpu_probe_nxp(c, cpu);
1250 		break;
1251 	case PRID_COMP_CAVIUM:
1252 		cpu_probe_cavium(c, cpu);
1253 		break;
1254 	case PRID_COMP_INGENIC:
1255 		cpu_probe_ingenic(c, cpu);
1256 		break;
1257 	case PRID_COMP_NETLOGIC:
1258 		cpu_probe_netlogic(c, cpu);
1259 		break;
1260 	}
1261 
1262 	BUG_ON(!__cpu_name[cpu]);
1263 	BUG_ON(c->cputype == CPU_UNKNOWN);
1264 
1265 	/*
1266 	 * Platform code can force the cpu type to optimize code
1267 	 * generation. In that case be sure the cpu type is correctly
1268 	 * manually setup otherwise it could trigger some nasty bugs.
1269 	 */
1270 	BUG_ON(current_cpu_type() != c->cputype);
1271 
1272 	if (mips_fpu_disabled)
1273 		c->options &= ~MIPS_CPU_FPU;
1274 
1275 	if (mips_dsp_disabled)
1276 		c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
1277 
1278 	if (mips_htw_disabled) {
1279 		c->options &= ~MIPS_CPU_HTW;
1280 		write_c0_pwctl(read_c0_pwctl() &
1281 			       ~(1 << MIPS_PWCTL_PWEN_SHIFT));
1282 	}
1283 
1284 	if (c->options & MIPS_CPU_FPU) {
1285 		c->fpu_id = cpu_get_fpu_id();
1286 
1287 		if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
1288 				    MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) {
1289 			if (c->fpu_id & MIPS_FPIR_3D)
1290 				c->ases |= MIPS_ASE_MIPS3D;
1291 		}
1292 	}
1293 
1294 	if (cpu_has_mips_r2) {
1295 		c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1296 		/* R2 has Performance Counter Interrupt indicator */
1297 		c->options |= MIPS_CPU_PCI;
1298 	}
1299 	else
1300 		c->srsets = 1;
1301 
1302 	if (cpu_has_msa) {
1303 		c->msa_id = cpu_get_msa_id();
1304 		WARN(c->msa_id & MSA_IR_WRPF,
1305 		     "Vector register partitioning unimplemented!");
1306 	}
1307 
1308 	cpu_probe_vmbits(c);
1309 
1310 #ifdef CONFIG_64BIT
1311 	if (cpu == 0)
1312 		__ua_limit = ~((1ull << cpu_vmbits) - 1);
1313 #endif
1314 }
1315 
1316 void cpu_report(void)
1317 {
1318 	struct cpuinfo_mips *c = &current_cpu_data;
1319 
1320 	pr_info("CPU%d revision is: %08x (%s)\n",
1321 		smp_processor_id(), c->processor_id, cpu_name_string());
1322 	if (c->options & MIPS_CPU_FPU)
1323 		printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1324 	if (cpu_has_msa)
1325 		pr_info("MSA revision is: %08x\n", c->msa_id);
1326 }
1327