2 * Processor capabilities determination functions.
4 * Copyright (C) xxxx the Anonymous
5 * Copyright (C) 1994 - 2006 Ralf Baechle
6 * Copyright (C) 2003, 2004 Maciej W. Rozycki
7 * Copyright (C) 2001, 2004 MIPS Inc.
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.
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/ptrace.h>
17 #include <linux/smp.h>
18 #include <linux/stddef.h>
19 #include <linux/module.h>
24 #include <asm/mipsregs.h>
25 #include <asm/system.h>
26 #include <asm/watch.h>
27 #include <asm/spram.h>
29 * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
30 * the implementation of the "wait" feature differs between CPU families. This
31 * points to the function that implements CPU specific wait.
32 * The wait instruction stops the pipeline and reduces the power consumption of
35 void (*cpu_wait)(void);
36 EXPORT_SYMBOL(cpu_wait);
38 static void r3081_wait(void)
40 unsigned long cfg = read_c0_conf();
41 write_c0_conf(cfg | R30XX_CONF_HALT);
44 static void r39xx_wait(void)
48 write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
52 extern void r4k_wait(void);
55 * This variant is preferable as it allows testing need_resched and going to
56 * sleep depending on the outcome atomically. Unfortunately the "It is
57 * implementation-dependent whether the pipeline restarts when a non-enabled
58 * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
59 * using this version a gamble.
61 void r4k_wait_irqoff(void)
65 __asm__(" .set push \n"
70 __asm__(" .globl __pastwait \n"
76 * The RM7000 variant has to handle erratum 38. The workaround is to not
77 * have any pending stores when the WAIT instruction is executed.
79 static void rm7k_wait_irqoff(void)
89 " mtc0 $1, $12 # stalls until W stage \n"
91 " mtc0 $1, $12 # stalls until W stage \n"
97 * The Au1xxx wait is available only if using 32khz counter or
98 * external timer source, but specifically not CP0 Counter.
99 * alchemy/common/time.c may override cpu_wait!
101 static void au1k_wait(void)
103 __asm__(" .set mips3 \n"
104 " cache 0x14, 0(%0) \n"
105 " cache 0x14, 32(%0) \n"
114 : : "r" (au1k_wait));
117 static int __initdata nowait;
119 static int __init wait_disable(char *s)
126 __setup("nowait", wait_disable);
128 void __init check_wait(void)
130 struct cpuinfo_mips *c = ¤t_cpu_data;
133 printk("Wait instruction disabled.\n");
137 switch (c->cputype) {
140 cpu_wait = r3081_wait;
143 cpu_wait = r39xx_wait;
146 /* case CPU_R4300: */
164 case CPU_CAVIUM_OCTEON:
169 cpu_wait = rm7k_wait_irqoff;
176 if (read_c0_config7() & MIPS_CONF7_WII)
177 cpu_wait = r4k_wait_irqoff;
182 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
183 cpu_wait = r4k_wait_irqoff;
187 cpu_wait = r4k_wait_irqoff;
190 cpu_wait = au1k_wait;
194 * WAIT on Rev1.0 has E1, E2, E3 and E16.
195 * WAIT on Rev2.0 and Rev3.0 has E16.
196 * Rev3.1 WAIT is nop, why bother
198 if ((c->processor_id & 0xff) <= 0x64)
202 * Another rev is incremeting c0_count at a reduced clock
203 * rate while in WAIT mode. So we basically have the choice
204 * between using the cp0 timer as clocksource or avoiding
205 * the WAIT instruction. Until more details are known,
206 * disable the use of WAIT for 20Kc entirely.
211 if ((c->processor_id & 0x00ff) >= 0x40)
219 static inline void check_errata(void)
221 struct cpuinfo_mips *c = ¤t_cpu_data;
223 switch (c->cputype) {
226 * Erratum "RPS May Cause Incorrect Instruction Execution"
227 * This code only handles VPE0, any SMP/SMTC/RTOS code
228 * making use of VPE1 will be responsable for that VPE.
230 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
231 write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
238 void __init check_bugs32(void)
244 * Probe whether cpu has config register by trying to play with
245 * alternate cache bit and see whether it matters.
246 * It's used by cpu_probe to distinguish between R3000A and R3081.
248 static inline int cpu_has_confreg(void)
250 #ifdef CONFIG_CPU_R3000
251 extern unsigned long r3k_cache_size(unsigned long);
252 unsigned long size1, size2;
253 unsigned long cfg = read_c0_conf();
255 size1 = r3k_cache_size(ST0_ISC);
256 write_c0_conf(cfg ^ R30XX_CONF_AC);
257 size2 = r3k_cache_size(ST0_ISC);
259 return size1 != size2;
266 * Get the FPU Implementation/Revision.
268 static inline unsigned long cpu_get_fpu_id(void)
270 unsigned long tmp, fpu_id;
272 tmp = read_c0_status();
274 fpu_id = read_32bit_cp1_register(CP1_REVISION);
275 write_c0_status(tmp);
280 * Check the CPU has an FPU the official way.
282 static inline int __cpu_has_fpu(void)
284 return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
287 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
289 #ifdef __NEED_VMBITS_PROBE
290 write_c0_entryhi(0x3fffffffffffe000ULL);
291 back_to_back_c0_hazard();
292 c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
296 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
299 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
301 switch (c->processor_id & 0xff00) {
303 c->cputype = CPU_R2000;
304 __cpu_name[cpu] = "R2000";
305 c->isa_level = MIPS_CPU_ISA_I;
306 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
309 c->options |= MIPS_CPU_FPU;
313 if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
314 if (cpu_has_confreg()) {
315 c->cputype = CPU_R3081E;
316 __cpu_name[cpu] = "R3081";
318 c->cputype = CPU_R3000A;
319 __cpu_name[cpu] = "R3000A";
323 c->cputype = CPU_R3000;
324 __cpu_name[cpu] = "R3000";
326 c->isa_level = MIPS_CPU_ISA_I;
327 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
330 c->options |= MIPS_CPU_FPU;
334 if (read_c0_config() & CONF_SC) {
335 if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
336 c->cputype = CPU_R4400PC;
337 __cpu_name[cpu] = "R4400PC";
339 c->cputype = CPU_R4000PC;
340 __cpu_name[cpu] = "R4000PC";
343 if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
344 c->cputype = CPU_R4400SC;
345 __cpu_name[cpu] = "R4400SC";
347 c->cputype = CPU_R4000SC;
348 __cpu_name[cpu] = "R4000SC";
352 c->isa_level = MIPS_CPU_ISA_III;
353 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
354 MIPS_CPU_WATCH | MIPS_CPU_VCE |
358 case PRID_IMP_VR41XX:
359 switch (c->processor_id & 0xf0) {
360 case PRID_REV_VR4111:
361 c->cputype = CPU_VR4111;
362 __cpu_name[cpu] = "NEC VR4111";
364 case PRID_REV_VR4121:
365 c->cputype = CPU_VR4121;
366 __cpu_name[cpu] = "NEC VR4121";
368 case PRID_REV_VR4122:
369 if ((c->processor_id & 0xf) < 0x3) {
370 c->cputype = CPU_VR4122;
371 __cpu_name[cpu] = "NEC VR4122";
373 c->cputype = CPU_VR4181A;
374 __cpu_name[cpu] = "NEC VR4181A";
377 case PRID_REV_VR4130:
378 if ((c->processor_id & 0xf) < 0x4) {
379 c->cputype = CPU_VR4131;
380 __cpu_name[cpu] = "NEC VR4131";
382 c->cputype = CPU_VR4133;
383 __cpu_name[cpu] = "NEC VR4133";
387 printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
388 c->cputype = CPU_VR41XX;
389 __cpu_name[cpu] = "NEC Vr41xx";
392 c->isa_level = MIPS_CPU_ISA_III;
393 c->options = R4K_OPTS;
397 c->cputype = CPU_R4300;
398 __cpu_name[cpu] = "R4300";
399 c->isa_level = MIPS_CPU_ISA_III;
400 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
405 c->cputype = CPU_R4600;
406 __cpu_name[cpu] = "R4600";
407 c->isa_level = MIPS_CPU_ISA_III;
408 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
415 * This processor doesn't have an MMU, so it's not
416 * "real easy" to run Linux on it. It is left purely
417 * for documentation. Commented out because it shares
418 * it's c0_prid id number with the TX3900.
420 c->cputype = CPU_R4650;
421 __cpu_name[cpu] = "R4650";
422 c->isa_level = MIPS_CPU_ISA_III;
423 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
428 c->isa_level = MIPS_CPU_ISA_I;
429 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
431 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
432 c->cputype = CPU_TX3927;
433 __cpu_name[cpu] = "TX3927";
436 switch (c->processor_id & 0xff) {
437 case PRID_REV_TX3912:
438 c->cputype = CPU_TX3912;
439 __cpu_name[cpu] = "TX3912";
442 case PRID_REV_TX3922:
443 c->cputype = CPU_TX3922;
444 __cpu_name[cpu] = "TX3922";
451 c->cputype = CPU_R4700;
452 __cpu_name[cpu] = "R4700";
453 c->isa_level = MIPS_CPU_ISA_III;
454 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
459 c->cputype = CPU_TX49XX;
460 __cpu_name[cpu] = "R49XX";
461 c->isa_level = MIPS_CPU_ISA_III;
462 c->options = R4K_OPTS | MIPS_CPU_LLSC;
463 if (!(c->processor_id & 0x08))
464 c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
468 c->cputype = CPU_R5000;
469 __cpu_name[cpu] = "R5000";
470 c->isa_level = MIPS_CPU_ISA_IV;
471 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
476 c->cputype = CPU_R5432;
477 __cpu_name[cpu] = "R5432";
478 c->isa_level = MIPS_CPU_ISA_IV;
479 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
480 MIPS_CPU_WATCH | MIPS_CPU_LLSC;
484 c->cputype = CPU_R5500;
485 __cpu_name[cpu] = "R5500";
486 c->isa_level = MIPS_CPU_ISA_IV;
487 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
488 MIPS_CPU_WATCH | MIPS_CPU_LLSC;
491 case PRID_IMP_NEVADA:
492 c->cputype = CPU_NEVADA;
493 __cpu_name[cpu] = "Nevada";
494 c->isa_level = MIPS_CPU_ISA_IV;
495 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
496 MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
500 c->cputype = CPU_R6000;
501 __cpu_name[cpu] = "R6000";
502 c->isa_level = MIPS_CPU_ISA_II;
503 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
507 case PRID_IMP_R6000A:
508 c->cputype = CPU_R6000A;
509 __cpu_name[cpu] = "R6000A";
510 c->isa_level = MIPS_CPU_ISA_II;
511 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
515 case PRID_IMP_RM7000:
516 c->cputype = CPU_RM7000;
517 __cpu_name[cpu] = "RM7000";
518 c->isa_level = MIPS_CPU_ISA_IV;
519 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
522 * Undocumented RM7000: Bit 29 in the info register of
523 * the RM7000 v2.0 indicates if the TLB has 48 or 64
526 * 29 1 => 64 entry JTLB
529 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
531 case PRID_IMP_RM9000:
532 c->cputype = CPU_RM9000;
533 __cpu_name[cpu] = "RM9000";
534 c->isa_level = MIPS_CPU_ISA_IV;
535 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
538 * Bit 29 in the info register of the RM9000
539 * indicates if the TLB has 48 or 64 entries.
541 * 29 1 => 64 entry JTLB
544 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
547 c->cputype = CPU_R8000;
548 __cpu_name[cpu] = "RM8000";
549 c->isa_level = MIPS_CPU_ISA_IV;
550 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
551 MIPS_CPU_FPU | MIPS_CPU_32FPR |
553 c->tlbsize = 384; /* has weird TLB: 3-way x 128 */
555 case PRID_IMP_R10000:
556 c->cputype = CPU_R10000;
557 __cpu_name[cpu] = "R10000";
558 c->isa_level = MIPS_CPU_ISA_IV;
559 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
560 MIPS_CPU_FPU | MIPS_CPU_32FPR |
561 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
565 case PRID_IMP_R12000:
566 c->cputype = CPU_R12000;
567 __cpu_name[cpu] = "R12000";
568 c->isa_level = MIPS_CPU_ISA_IV;
569 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
570 MIPS_CPU_FPU | MIPS_CPU_32FPR |
571 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
575 case PRID_IMP_R14000:
576 c->cputype = CPU_R14000;
577 __cpu_name[cpu] = "R14000";
578 c->isa_level = MIPS_CPU_ISA_IV;
579 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
580 MIPS_CPU_FPU | MIPS_CPU_32FPR |
581 MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
585 case PRID_IMP_LOONGSON2:
586 c->cputype = CPU_LOONGSON2;
587 __cpu_name[cpu] = "ICT Loongson-2";
588 c->isa_level = MIPS_CPU_ISA_III;
589 c->options = R4K_OPTS |
590 MIPS_CPU_FPU | MIPS_CPU_LLSC |
597 static char unknown_isa[] __cpuinitdata = KERN_ERR \
598 "Unsupported ISA type, c0.config0: %d.";
600 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
602 unsigned int config0;
605 config0 = read_c0_config();
607 if (((config0 & MIPS_CONF_MT) >> 7) == 1)
608 c->options |= MIPS_CPU_TLB;
609 isa = (config0 & MIPS_CONF_AT) >> 13;
612 switch ((config0 & MIPS_CONF_AR) >> 10) {
614 c->isa_level = MIPS_CPU_ISA_M32R1;
617 c->isa_level = MIPS_CPU_ISA_M32R2;
624 switch ((config0 & MIPS_CONF_AR) >> 10) {
626 c->isa_level = MIPS_CPU_ISA_M64R1;
629 c->isa_level = MIPS_CPU_ISA_M64R2;
639 return config0 & MIPS_CONF_M;
642 panic(unknown_isa, config0);
645 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
647 unsigned int config1;
649 config1 = read_c0_config1();
651 if (config1 & MIPS_CONF1_MD)
652 c->ases |= MIPS_ASE_MDMX;
653 if (config1 & MIPS_CONF1_WR)
654 c->options |= MIPS_CPU_WATCH;
655 if (config1 & MIPS_CONF1_CA)
656 c->ases |= MIPS_ASE_MIPS16;
657 if (config1 & MIPS_CONF1_EP)
658 c->options |= MIPS_CPU_EJTAG;
659 if (config1 & MIPS_CONF1_FP) {
660 c->options |= MIPS_CPU_FPU;
661 c->options |= MIPS_CPU_32FPR;
664 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
666 return config1 & MIPS_CONF_M;
669 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
671 unsigned int config2;
673 config2 = read_c0_config2();
675 if (config2 & MIPS_CONF2_SL)
676 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
678 return config2 & MIPS_CONF_M;
681 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
683 unsigned int config3;
685 config3 = read_c0_config3();
687 if (config3 & MIPS_CONF3_SM)
688 c->ases |= MIPS_ASE_SMARTMIPS;
689 if (config3 & MIPS_CONF3_DSP)
690 c->ases |= MIPS_ASE_DSP;
691 if (config3 & MIPS_CONF3_VINT)
692 c->options |= MIPS_CPU_VINT;
693 if (config3 & MIPS_CONF3_VEIC)
694 c->options |= MIPS_CPU_VEIC;
695 if (config3 & MIPS_CONF3_MT)
696 c->ases |= MIPS_ASE_MIPSMT;
697 if (config3 & MIPS_CONF3_ULRI)
698 c->options |= MIPS_CPU_ULRI;
700 return config3 & MIPS_CONF_M;
703 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
705 unsigned int config4;
707 config4 = read_c0_config4();
709 if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT
711 c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
713 return config4 & MIPS_CONF_M;
716 static void __cpuinit decode_configs(struct cpuinfo_mips *c)
720 /* MIPS32 or MIPS64 compliant CPU. */
721 c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
722 MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
724 c->scache.flags = MIPS_CACHE_NOT_PRESENT;
726 ok = decode_config0(c); /* Read Config registers. */
727 BUG_ON(!ok); /* Arch spec violation! */
729 ok = decode_config1(c);
731 ok = decode_config2(c);
733 ok = decode_config3(c);
735 ok = decode_config4(c);
737 mips_probe_watch_registers(c);
740 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
743 switch (c->processor_id & 0xff00) {
745 c->cputype = CPU_4KC;
746 __cpu_name[cpu] = "MIPS 4Kc";
749 c->cputype = CPU_4KEC;
750 __cpu_name[cpu] = "MIPS 4KEc";
752 case PRID_IMP_4KECR2:
753 c->cputype = CPU_4KEC;
754 __cpu_name[cpu] = "MIPS 4KEc";
758 c->cputype = CPU_4KSC;
759 __cpu_name[cpu] = "MIPS 4KSc";
762 c->cputype = CPU_5KC;
763 __cpu_name[cpu] = "MIPS 5Kc";
766 c->cputype = CPU_20KC;
767 __cpu_name[cpu] = "MIPS 20Kc";
771 c->cputype = CPU_24K;
772 __cpu_name[cpu] = "MIPS 24Kc";
775 c->cputype = CPU_25KF;
776 __cpu_name[cpu] = "MIPS 25Kc";
779 c->cputype = CPU_34K;
780 __cpu_name[cpu] = "MIPS 34Kc";
783 c->cputype = CPU_74K;
784 __cpu_name[cpu] = "MIPS 74Kc";
787 c->cputype = CPU_1004K;
788 __cpu_name[cpu] = "MIPS 1004Kc";
795 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
798 switch (c->processor_id & 0xff00) {
799 case PRID_IMP_AU1_REV1:
800 case PRID_IMP_AU1_REV2:
801 c->cputype = CPU_ALCHEMY;
802 switch ((c->processor_id >> 24) & 0xff) {
804 __cpu_name[cpu] = "Au1000";
807 __cpu_name[cpu] = "Au1500";
810 __cpu_name[cpu] = "Au1100";
813 __cpu_name[cpu] = "Au1550";
816 __cpu_name[cpu] = "Au1200";
817 if ((c->processor_id & 0xff) == 2)
818 __cpu_name[cpu] = "Au1250";
821 __cpu_name[cpu] = "Au1210";
824 __cpu_name[cpu] = "Au1xxx";
831 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
835 switch (c->processor_id & 0xff00) {
837 c->cputype = CPU_SB1;
838 __cpu_name[cpu] = "SiByte SB1";
839 /* FPU in pass1 is known to have issues. */
840 if ((c->processor_id & 0xff) < 0x02)
841 c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
844 c->cputype = CPU_SB1A;
845 __cpu_name[cpu] = "SiByte SB1A";
850 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
853 switch (c->processor_id & 0xff00) {
854 case PRID_IMP_SR71000:
855 c->cputype = CPU_SR71000;
856 __cpu_name[cpu] = "Sandcraft SR71000";
863 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
866 switch (c->processor_id & 0xff00) {
867 case PRID_IMP_PR4450:
868 c->cputype = CPU_PR4450;
869 __cpu_name[cpu] = "Philips PR4450";
870 c->isa_level = MIPS_CPU_ISA_M32R1;
875 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
878 switch (c->processor_id & 0xff00) {
879 case PRID_IMP_BCM3302:
880 /* same as PRID_IMP_BCM6338 */
881 c->cputype = CPU_BCM3302;
882 __cpu_name[cpu] = "Broadcom BCM3302";
884 case PRID_IMP_BCM4710:
885 c->cputype = CPU_BCM4710;
886 __cpu_name[cpu] = "Broadcom BCM4710";
888 case PRID_IMP_BCM6345:
889 c->cputype = CPU_BCM6345;
890 __cpu_name[cpu] = "Broadcom BCM6345";
892 case PRID_IMP_BCM6348:
893 c->cputype = CPU_BCM6348;
894 __cpu_name[cpu] = "Broadcom BCM6348";
896 case PRID_IMP_BCM4350:
897 switch (c->processor_id & 0xf0) {
898 case PRID_REV_BCM6358:
899 c->cputype = CPU_BCM6358;
900 __cpu_name[cpu] = "Broadcom BCM6358";
903 c->cputype = CPU_UNKNOWN;
910 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
913 switch (c->processor_id & 0xff00) {
914 case PRID_IMP_CAVIUM_CN38XX:
915 case PRID_IMP_CAVIUM_CN31XX:
916 case PRID_IMP_CAVIUM_CN30XX:
917 case PRID_IMP_CAVIUM_CN58XX:
918 case PRID_IMP_CAVIUM_CN56XX:
919 case PRID_IMP_CAVIUM_CN50XX:
920 case PRID_IMP_CAVIUM_CN52XX:
921 c->cputype = CPU_CAVIUM_OCTEON;
922 __cpu_name[cpu] = "Cavium Octeon";
925 printk(KERN_INFO "Unknown Octeon chip!\n");
926 c->cputype = CPU_UNKNOWN;
931 const char *__cpu_name[NR_CPUS];
933 __cpuinit void cpu_probe(void)
935 struct cpuinfo_mips *c = ¤t_cpu_data;
936 unsigned int cpu = smp_processor_id();
938 c->processor_id = PRID_IMP_UNKNOWN;
939 c->fpu_id = FPIR_IMP_NONE;
940 c->cputype = CPU_UNKNOWN;
942 c->processor_id = read_c0_prid();
943 switch (c->processor_id & 0xff0000) {
944 case PRID_COMP_LEGACY:
945 cpu_probe_legacy(c, cpu);
948 cpu_probe_mips(c, cpu);
950 case PRID_COMP_ALCHEMY:
951 cpu_probe_alchemy(c, cpu);
953 case PRID_COMP_SIBYTE:
954 cpu_probe_sibyte(c, cpu);
956 case PRID_COMP_BROADCOM:
957 cpu_probe_broadcom(c, cpu);
959 case PRID_COMP_SANDCRAFT:
960 cpu_probe_sandcraft(c, cpu);
963 cpu_probe_nxp(c, cpu);
965 case PRID_COMP_CAVIUM:
966 cpu_probe_cavium(c, cpu);
970 BUG_ON(!__cpu_name[cpu]);
971 BUG_ON(c->cputype == CPU_UNKNOWN);
974 * Platform code can force the cpu type to optimize code
975 * generation. In that case be sure the cpu type is correctly
976 * manually setup otherwise it could trigger some nasty bugs.
978 BUG_ON(current_cpu_type() != c->cputype);
980 if (c->options & MIPS_CPU_FPU) {
981 c->fpu_id = cpu_get_fpu_id();
983 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
984 c->isa_level == MIPS_CPU_ISA_M32R2 ||
985 c->isa_level == MIPS_CPU_ISA_M64R1 ||
986 c->isa_level == MIPS_CPU_ISA_M64R2) {
987 if (c->fpu_id & MIPS_FPIR_3D)
988 c->ases |= MIPS_ASE_MIPS3D;
993 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1000 __cpuinit void cpu_report(void)
1002 struct cpuinfo_mips *c = ¤t_cpu_data;
1004 printk(KERN_INFO "CPU revision is: %08x (%s)\n",
1005 c->processor_id, cpu_name_string());
1006 if (c->options & MIPS_CPU_FPU)
1007 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);