649 lines
15 KiB
C
649 lines
15 KiB
C
/*
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* Processor capabilities determination functions.
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*
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* Copyright (C) xxxx the Anonymous
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* Copyright (C) 2003, 2004 Maciej W. Rozycki
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* Copyright (C) 1994 - 2003 Ralf Baechle
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* Copyright (C) 2001, 2004 MIPS Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/stddef.h>
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#include <asm/cpu.h>
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#include <asm/fpu.h>
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#include <asm/mipsregs.h>
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#include <asm/system.h>
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/*
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* Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
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* the implementation of the "wait" feature differs between CPU families. This
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* points to the function that implements CPU specific wait.
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* The wait instruction stops the pipeline and reduces the power consumption of
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* the CPU very much.
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*/
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void (*cpu_wait)(void) = NULL;
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static void r3081_wait(void)
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{
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unsigned long cfg = read_c0_conf();
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write_c0_conf(cfg | R30XX_CONF_HALT);
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}
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static void r39xx_wait(void)
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{
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unsigned long cfg = read_c0_conf();
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write_c0_conf(cfg | TX39_CONF_HALT);
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}
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static void r4k_wait(void)
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{
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__asm__(".set\tmips3\n\t"
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"wait\n\t"
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".set\tmips0");
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}
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/* The Au1xxx wait is available only if using 32khz counter or
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* external timer source, but specifically not CP0 Counter. */
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int allow_au1k_wait;
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static void au1k_wait(void)
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{
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unsigned long addr = 0;
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/* using the wait instruction makes CP0 counter unusable */
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__asm__("la %0,au1k_wait\n\t"
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".set mips3\n\t"
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"cache 0x14,0(%0)\n\t"
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"cache 0x14,32(%0)\n\t"
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"sync\n\t"
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"nop\n\t"
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"wait\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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".set mips0\n\t"
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: : "r" (addr));
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}
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static inline void check_wait(void)
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{
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struct cpuinfo_mips *c = ¤t_cpu_data;
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printk("Checking for 'wait' instruction... ");
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switch (c->cputype) {
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case CPU_R3081:
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case CPU_R3081E:
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cpu_wait = r3081_wait;
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printk(" available.\n");
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break;
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case CPU_TX3927:
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cpu_wait = r39xx_wait;
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printk(" available.\n");
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break;
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case CPU_R4200:
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/* case CPU_R4300: */
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case CPU_R4600:
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case CPU_R4640:
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case CPU_R4650:
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case CPU_R4700:
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case CPU_R5000:
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case CPU_NEVADA:
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case CPU_RM7000:
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case CPU_RM9000:
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case CPU_TX49XX:
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case CPU_4KC:
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case CPU_4KEC:
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case CPU_4KSC:
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case CPU_5KC:
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/* case CPU_20KC:*/
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case CPU_24K:
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case CPU_25KF:
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cpu_wait = r4k_wait;
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printk(" available.\n");
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break;
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case CPU_AU1000:
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case CPU_AU1100:
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case CPU_AU1500:
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case CPU_AU1550:
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case CPU_AU1200:
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if (allow_au1k_wait) {
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cpu_wait = au1k_wait;
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printk(" available.\n");
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} else
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printk(" unavailable.\n");
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break;
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default:
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printk(" unavailable.\n");
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break;
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}
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}
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void __init check_bugs32(void)
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{
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check_wait();
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}
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/*
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* Probe whether cpu has config register by trying to play with
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* alternate cache bit and see whether it matters.
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* It's used by cpu_probe to distinguish between R3000A and R3081.
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*/
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static inline int cpu_has_confreg(void)
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{
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#ifdef CONFIG_CPU_R3000
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extern unsigned long r3k_cache_size(unsigned long);
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unsigned long size1, size2;
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unsigned long cfg = read_c0_conf();
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size1 = r3k_cache_size(ST0_ISC);
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write_c0_conf(cfg ^ R30XX_CONF_AC);
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size2 = r3k_cache_size(ST0_ISC);
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write_c0_conf(cfg);
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return size1 != size2;
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#else
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return 0;
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#endif
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}
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/*
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* Get the FPU Implementation/Revision.
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*/
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static inline unsigned long cpu_get_fpu_id(void)
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{
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unsigned long tmp, fpu_id;
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tmp = read_c0_status();
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__enable_fpu();
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fpu_id = read_32bit_cp1_register(CP1_REVISION);
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write_c0_status(tmp);
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return fpu_id;
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}
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/*
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* Check the CPU has an FPU the official way.
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*/
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static inline int __cpu_has_fpu(void)
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{
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return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
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}
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#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4KTLB \
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| MIPS_CPU_COUNTER)
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static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
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{
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switch (c->processor_id & 0xff00) {
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case PRID_IMP_R2000:
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c->cputype = CPU_R2000;
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c->isa_level = MIPS_CPU_ISA_I;
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c->options = MIPS_CPU_TLB | MIPS_CPU_NOFPUEX;
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if (__cpu_has_fpu())
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c->options |= MIPS_CPU_FPU;
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c->tlbsize = 64;
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break;
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case PRID_IMP_R3000:
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if ((c->processor_id & 0xff) == PRID_REV_R3000A)
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if (cpu_has_confreg())
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c->cputype = CPU_R3081E;
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else
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c->cputype = CPU_R3000A;
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else
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c->cputype = CPU_R3000;
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c->isa_level = MIPS_CPU_ISA_I;
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c->options = MIPS_CPU_TLB | MIPS_CPU_NOFPUEX;
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if (__cpu_has_fpu())
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c->options |= MIPS_CPU_FPU;
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c->tlbsize = 64;
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break;
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case PRID_IMP_R4000:
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if (read_c0_config() & CONF_SC) {
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if ((c->processor_id & 0xff) >= PRID_REV_R4400)
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c->cputype = CPU_R4400PC;
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else
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c->cputype = CPU_R4000PC;
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} else {
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if ((c->processor_id & 0xff) >= PRID_REV_R4400)
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c->cputype = CPU_R4400SC;
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else
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c->cputype = CPU_R4000SC;
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}
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_WATCH | MIPS_CPU_VCE |
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MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_VR41XX:
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switch (c->processor_id & 0xf0) {
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case PRID_REV_VR4111:
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c->cputype = CPU_VR4111;
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break;
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case PRID_REV_VR4121:
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c->cputype = CPU_VR4121;
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break;
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case PRID_REV_VR4122:
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if ((c->processor_id & 0xf) < 0x3)
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c->cputype = CPU_VR4122;
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else
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c->cputype = CPU_VR4181A;
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break;
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case PRID_REV_VR4130:
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if ((c->processor_id & 0xf) < 0x4)
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c->cputype = CPU_VR4131;
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else
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c->cputype = CPU_VR4133;
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break;
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default:
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printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
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c->cputype = CPU_VR41XX;
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break;
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}
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS;
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c->tlbsize = 32;
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break;
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case PRID_IMP_R4300:
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c->cputype = CPU_R4300;
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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c->tlbsize = 32;
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break;
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case PRID_IMP_R4600:
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c->cputype = CPU_R4600;
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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#if 0
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case PRID_IMP_R4650:
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/*
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* This processor doesn't have an MMU, so it's not
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* "real easy" to run Linux on it. It is left purely
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* for documentation. Commented out because it shares
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* it's c0_prid id number with the TX3900.
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*/
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c->cputype = CPU_R4650;
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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#endif
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case PRID_IMP_TX39:
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c->isa_level = MIPS_CPU_ISA_I;
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c->options = MIPS_CPU_TLB;
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if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
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c->cputype = CPU_TX3927;
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c->tlbsize = 64;
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} else {
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switch (c->processor_id & 0xff) {
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case PRID_REV_TX3912:
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c->cputype = CPU_TX3912;
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c->tlbsize = 32;
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break;
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case PRID_REV_TX3922:
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c->cputype = CPU_TX3922;
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c->tlbsize = 64;
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break;
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default:
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c->cputype = CPU_UNKNOWN;
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break;
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}
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}
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break;
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case PRID_IMP_R4700:
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c->cputype = CPU_R4700;
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_TX49:
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c->cputype = CPU_TX49XX;
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c->isa_level = MIPS_CPU_ISA_III;
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c->options = R4K_OPTS | MIPS_CPU_LLSC;
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if (!(c->processor_id & 0x08))
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c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
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c->tlbsize = 48;
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break;
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case PRID_IMP_R5000:
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c->cputype = CPU_R5000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_R5432:
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c->cputype = CPU_R5432;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_WATCH | MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_R5500:
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c->cputype = CPU_R5500;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_WATCH | MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_NEVADA:
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c->cputype = CPU_NEVADA;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
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c->tlbsize = 48;
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break;
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case PRID_IMP_R6000:
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c->cputype = CPU_R6000;
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c->isa_level = MIPS_CPU_ISA_II;
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c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
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MIPS_CPU_LLSC;
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c->tlbsize = 32;
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break;
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case PRID_IMP_R6000A:
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c->cputype = CPU_R6000A;
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c->isa_level = MIPS_CPU_ISA_II;
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c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
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MIPS_CPU_LLSC;
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c->tlbsize = 32;
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break;
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case PRID_IMP_RM7000:
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c->cputype = CPU_RM7000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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/*
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* Undocumented RM7000: Bit 29 in the info register of
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* the RM7000 v2.0 indicates if the TLB has 48 or 64
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* entries.
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*
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* 29 1 => 64 entry JTLB
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* 0 => 48 entry JTLB
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*/
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c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
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break;
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case PRID_IMP_RM9000:
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c->cputype = CPU_RM9000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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/*
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* Bit 29 in the info register of the RM9000
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* indicates if the TLB has 48 or 64 entries.
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*
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* 29 1 => 64 entry JTLB
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* 0 => 48 entry JTLB
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*/
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c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
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break;
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case PRID_IMP_R8000:
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c->cputype = CPU_R8000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
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MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_LLSC;
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c->tlbsize = 384; /* has weird TLB: 3-way x 128 */
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break;
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case PRID_IMP_R10000:
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c->cputype = CPU_R10000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
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MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
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MIPS_CPU_LLSC;
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c->tlbsize = 64;
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break;
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case PRID_IMP_R12000:
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c->cputype = CPU_R12000;
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c->isa_level = MIPS_CPU_ISA_IV;
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c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
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MIPS_CPU_FPU | MIPS_CPU_32FPR |
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MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
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MIPS_CPU_LLSC;
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c->tlbsize = 64;
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break;
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}
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}
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static inline unsigned int decode_config0(struct cpuinfo_mips *c)
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{
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unsigned int config0;
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int isa;
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config0 = read_c0_config();
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if (((config0 & MIPS_CONF_MT) >> 7) == 1)
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c->options |= MIPS_CPU_TLB;
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isa = (config0 & MIPS_CONF_AT) >> 13;
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switch (isa) {
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case 0:
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c->isa_level = MIPS_CPU_ISA_M32;
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break;
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case 2:
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c->isa_level = MIPS_CPU_ISA_M64;
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break;
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default:
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panic("Unsupported ISA type, cp0.config0.at: %d.", isa);
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}
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return config0 & MIPS_CONF_M;
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}
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static inline unsigned int decode_config1(struct cpuinfo_mips *c)
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{
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unsigned int config1;
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config1 = read_c0_config1();
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if (config1 & MIPS_CONF1_MD)
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c->ases |= MIPS_ASE_MDMX;
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if (config1 & MIPS_CONF1_WR)
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c->options |= MIPS_CPU_WATCH;
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if (config1 & MIPS_CONF1_CA)
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c->ases |= MIPS_ASE_MIPS16;
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if (config1 & MIPS_CONF1_EP)
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c->options |= MIPS_CPU_EJTAG;
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if (config1 & MIPS_CONF1_FP) {
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c->options |= MIPS_CPU_FPU;
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c->options |= MIPS_CPU_32FPR;
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}
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if (cpu_has_tlb)
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c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
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return config1 & MIPS_CONF_M;
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}
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static inline unsigned int decode_config2(struct cpuinfo_mips *c)
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{
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unsigned int config2;
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config2 = read_c0_config2();
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if (config2 & MIPS_CONF2_SL)
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c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
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return config2 & MIPS_CONF_M;
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}
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static inline unsigned int decode_config3(struct cpuinfo_mips *c)
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{
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unsigned int config3;
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config3 = read_c0_config3();
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if (config3 & MIPS_CONF3_SM)
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c->ases |= MIPS_ASE_SMARTMIPS;
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return config3 & MIPS_CONF_M;
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|
}
|
|
|
|
static inline void decode_configs(struct cpuinfo_mips *c)
|
|
{
|
|
/* MIPS32 or MIPS64 compliant CPU. */
|
|
c->options = MIPS_CPU_4KEX | MIPS_CPU_COUNTER | MIPS_CPU_DIVEC |
|
|
MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
|
|
|
|
c->scache.flags = MIPS_CACHE_NOT_PRESENT;
|
|
|
|
/* Read Config registers. */
|
|
if (!decode_config0(c))
|
|
return; /* actually worth a panic() */
|
|
if (!decode_config1(c))
|
|
return;
|
|
if (!decode_config2(c))
|
|
return;
|
|
if (!decode_config3(c))
|
|
return;
|
|
}
|
|
|
|
static inline void cpu_probe_mips(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
if (cpu_has_tlb)
|
|
c->options |= MIPS_CPU_4KTLB;
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_4KC:
|
|
c->cputype = CPU_4KC;
|
|
break;
|
|
case PRID_IMP_4KEC:
|
|
c->cputype = CPU_4KEC;
|
|
break;
|
|
case PRID_IMP_4KECR2:
|
|
c->cputype = CPU_4KEC;
|
|
break;
|
|
case PRID_IMP_4KSC:
|
|
c->cputype = CPU_4KSC;
|
|
break;
|
|
case PRID_IMP_5KC:
|
|
c->cputype = CPU_5KC;
|
|
break;
|
|
case PRID_IMP_20KC:
|
|
c->cputype = CPU_20KC;
|
|
break;
|
|
case PRID_IMP_24K:
|
|
c->cputype = CPU_24K;
|
|
break;
|
|
case PRID_IMP_25KF:
|
|
c->cputype = CPU_25KF;
|
|
/* Probe for L2 cache */
|
|
c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_probe_alchemy(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_AU1_REV1:
|
|
case PRID_IMP_AU1_REV2:
|
|
switch ((c->processor_id >> 24) & 0xff) {
|
|
case 0:
|
|
c->cputype = CPU_AU1000;
|
|
break;
|
|
case 1:
|
|
c->cputype = CPU_AU1500;
|
|
break;
|
|
case 2:
|
|
c->cputype = CPU_AU1100;
|
|
break;
|
|
case 3:
|
|
c->cputype = CPU_AU1550;
|
|
break;
|
|
case 4:
|
|
c->cputype = CPU_AU1200;
|
|
break;
|
|
default:
|
|
panic("Unknown Au Core!");
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_probe_sibyte(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_SB1:
|
|
c->cputype = CPU_SB1;
|
|
#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
|
|
/* FPU in pass1 is known to have issues. */
|
|
c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
if (cpu_has_tlb)
|
|
c->options |= MIPS_CPU_4KTLB;
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_SR71000:
|
|
c->cputype = CPU_SR71000;
|
|
c->scache.ways = 8;
|
|
c->tlbsize = 64;
|
|
break;
|
|
}
|
|
}
|
|
|
|
__init void cpu_probe(void)
|
|
{
|
|
struct cpuinfo_mips *c = ¤t_cpu_data;
|
|
|
|
c->processor_id = PRID_IMP_UNKNOWN;
|
|
c->fpu_id = FPIR_IMP_NONE;
|
|
c->cputype = CPU_UNKNOWN;
|
|
|
|
c->processor_id = read_c0_prid();
|
|
switch (c->processor_id & 0xff0000) {
|
|
case PRID_COMP_LEGACY:
|
|
cpu_probe_legacy(c);
|
|
break;
|
|
case PRID_COMP_MIPS:
|
|
cpu_probe_mips(c);
|
|
break;
|
|
case PRID_COMP_ALCHEMY:
|
|
cpu_probe_alchemy(c);
|
|
break;
|
|
case PRID_COMP_SIBYTE:
|
|
cpu_probe_sibyte(c);
|
|
break;
|
|
case PRID_COMP_SANDCRAFT:
|
|
cpu_probe_sandcraft(c);
|
|
break;
|
|
default:
|
|
c->cputype = CPU_UNKNOWN;
|
|
}
|
|
if (c->options & MIPS_CPU_FPU) {
|
|
c->fpu_id = cpu_get_fpu_id();
|
|
|
|
if (c->isa_level == MIPS_CPU_ISA_M32 ||
|
|
c->isa_level == MIPS_CPU_ISA_M64) {
|
|
if (c->fpu_id & MIPS_FPIR_3D)
|
|
c->ases |= MIPS_ASE_MIPS3D;
|
|
}
|
|
}
|
|
}
|
|
|
|
__init void cpu_report(void)
|
|
{
|
|
struct cpuinfo_mips *c = ¤t_cpu_data;
|
|
|
|
printk("CPU revision is: %08x\n", c->processor_id);
|
|
if (c->options & MIPS_CPU_FPU)
|
|
printk("FPU revision is: %08x\n", c->fpu_id);
|
|
}
|