957 lines
23 KiB
C
957 lines
23 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) 1994 - 2006 Ralf Baechle
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* Copyright (C) 2003, 2004 Maciej W. Rozycki
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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/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/bugs.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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local_irq_disable();
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if (!need_resched())
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write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
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local_irq_enable();
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}
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/*
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* There is a race when WAIT instruction executed with interrupt
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* enabled.
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* But it is implementation-dependent wheter the pipelie restarts when
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* a non-enabled interrupt is requested.
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*/
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static void r4k_wait(void)
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{
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__asm__(" .set mips3 \n"
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" wait \n"
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" .set mips0 \n");
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}
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/*
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* This variant is preferable as it allows testing need_resched and going to
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* sleep depending on the outcome atomically. Unfortunately the "It is
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* implementation-dependent whether the pipeline restarts when a non-enabled
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* interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
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* using this version a gamble.
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*/
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static void r4k_wait_irqoff(void)
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{
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local_irq_disable();
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if (!need_resched())
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__asm__(" .set mips3 \n"
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" wait \n"
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" .set mips0 \n");
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local_irq_enable();
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}
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/*
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* The RM7000 variant has to handle erratum 38. The workaround is to not
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* have any pending stores when the WAIT instruction is executed.
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*/
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static void rm7k_wait_irqoff(void)
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{
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local_irq_disable();
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if (!need_resched())
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__asm__(
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" .set push \n"
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" .set mips3 \n"
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" .set noat \n"
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" mfc0 $1, $12 \n"
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" sync \n"
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" mtc0 $1, $12 # stalls until W stage \n"
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" wait \n"
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" mtc0 $1, $12 # stalls until W stage \n"
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" .set pop \n");
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local_irq_enable();
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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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/* using the wait instruction makes CP0 counter unusable */
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__asm__(" .set mips3 \n"
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" cache 0x14, 0(%0) \n"
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" cache 0x14, 32(%0) \n"
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" sync \n"
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" nop \n"
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" wait \n"
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" nop \n"
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" nop \n"
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" nop \n"
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" nop \n"
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" .set mips0 \n"
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: : "r" (au1k_wait));
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}
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static int __initdata nowait = 0;
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static int __init wait_disable(char *s)
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{
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nowait = 1;
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return 1;
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}
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__setup("nowait", wait_disable);
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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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if (nowait) {
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printk("Wait instruction disabled.\n");
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return;
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}
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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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break;
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case CPU_TX3927:
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cpu_wait = r39xx_wait;
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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_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_25KF:
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case CPU_PR4450:
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case CPU_BCM3302:
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cpu_wait = r4k_wait;
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break;
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case CPU_RM7000:
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cpu_wait = rm7k_wait_irqoff;
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break;
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case CPU_24K:
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case CPU_34K:
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cpu_wait = r4k_wait;
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if (read_c0_config7() & MIPS_CONF7_WII)
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cpu_wait = r4k_wait_irqoff;
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break;
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case CPU_74K:
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cpu_wait = r4k_wait;
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if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
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cpu_wait = r4k_wait_irqoff;
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break;
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case CPU_TX49XX:
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cpu_wait = r4k_wait_irqoff;
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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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break;
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case CPU_20KC:
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/*
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* WAIT on Rev1.0 has E1, E2, E3 and E16.
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* WAIT on Rev2.0 and Rev3.0 has E16.
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* Rev3.1 WAIT is nop, why bother
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*/
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if ((c->processor_id & 0xff) <= 0x64)
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break;
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/*
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* Another rev is incremeting c0_count at a reduced clock
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* rate while in WAIT mode. So we basically have the choice
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* between using the cp0 timer as clocksource or avoiding
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* the WAIT instruction. Until more details are known,
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* disable the use of WAIT for 20Kc entirely.
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cpu_wait = r4k_wait;
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*/
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break;
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case CPU_RM9000:
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if ((c->processor_id & 0x00ff) >= 0x40)
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cpu_wait = r4k_wait;
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break;
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default:
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break;
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}
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}
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static inline void check_errata(void)
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{
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struct cpuinfo_mips *c = ¤t_cpu_data;
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switch (c->cputype) {
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case CPU_34K:
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/*
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* Erratum "RPS May Cause Incorrect Instruction Execution"
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* This code only handles VPE0, any SMP/SMTC/RTOS code
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* making use of VPE1 will be responsable for that VPE.
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*/
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if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
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write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
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break;
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default:
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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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check_errata();
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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_4K_CACHE \
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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_3K_CACHE |
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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_3K_CACHE |
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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_32FPR |
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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 | MIPS_CPU_TX39_CACHE;
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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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/*
|
|
* Bit 29 in the info register of the RM9000
|
|
* indicates if the TLB has 48 or 64 entries.
|
|
*
|
|
* 29 1 => 64 entry JTLB
|
|
* 0 => 48 entry JTLB
|
|
*/
|
|
c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
|
|
break;
|
|
case PRID_IMP_R8000:
|
|
c->cputype = CPU_R8000;
|
|
c->isa_level = MIPS_CPU_ISA_IV;
|
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
|
|
MIPS_CPU_FPU | MIPS_CPU_32FPR |
|
|
MIPS_CPU_LLSC;
|
|
c->tlbsize = 384; /* has weird TLB: 3-way x 128 */
|
|
break;
|
|
case PRID_IMP_R10000:
|
|
c->cputype = CPU_R10000;
|
|
c->isa_level = MIPS_CPU_ISA_IV;
|
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
|
|
MIPS_CPU_FPU | MIPS_CPU_32FPR |
|
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
|
|
MIPS_CPU_LLSC;
|
|
c->tlbsize = 64;
|
|
break;
|
|
case PRID_IMP_R12000:
|
|
c->cputype = CPU_R12000;
|
|
c->isa_level = MIPS_CPU_ISA_IV;
|
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
|
|
MIPS_CPU_FPU | MIPS_CPU_32FPR |
|
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
|
|
MIPS_CPU_LLSC;
|
|
c->tlbsize = 64;
|
|
break;
|
|
case PRID_IMP_R14000:
|
|
c->cputype = CPU_R14000;
|
|
c->isa_level = MIPS_CPU_ISA_IV;
|
|
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
|
|
MIPS_CPU_FPU | MIPS_CPU_32FPR |
|
|
MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
|
|
MIPS_CPU_LLSC;
|
|
c->tlbsize = 64;
|
|
break;
|
|
case PRID_IMP_LOONGSON2:
|
|
c->cputype = CPU_LOONGSON2;
|
|
c->isa_level = MIPS_CPU_ISA_III;
|
|
c->options = R4K_OPTS |
|
|
MIPS_CPU_FPU | MIPS_CPU_LLSC |
|
|
MIPS_CPU_32FPR;
|
|
c->tlbsize = 64;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static char unknown_isa[] __initdata = KERN_ERR \
|
|
"Unsupported ISA type, c0.config0: %d.";
|
|
|
|
static inline unsigned int decode_config0(struct cpuinfo_mips *c)
|
|
{
|
|
unsigned int config0;
|
|
int isa;
|
|
|
|
config0 = read_c0_config();
|
|
|
|
if (((config0 & MIPS_CONF_MT) >> 7) == 1)
|
|
c->options |= MIPS_CPU_TLB;
|
|
isa = (config0 & MIPS_CONF_AT) >> 13;
|
|
switch (isa) {
|
|
case 0:
|
|
switch ((config0 & MIPS_CONF_AR) >> 10) {
|
|
case 0:
|
|
c->isa_level = MIPS_CPU_ISA_M32R1;
|
|
break;
|
|
case 1:
|
|
c->isa_level = MIPS_CPU_ISA_M32R2;
|
|
break;
|
|
default:
|
|
goto unknown;
|
|
}
|
|
break;
|
|
case 2:
|
|
switch ((config0 & MIPS_CONF_AR) >> 10) {
|
|
case 0:
|
|
c->isa_level = MIPS_CPU_ISA_M64R1;
|
|
break;
|
|
case 1:
|
|
c->isa_level = MIPS_CPU_ISA_M64R2;
|
|
break;
|
|
default:
|
|
goto unknown;
|
|
}
|
|
break;
|
|
default:
|
|
goto unknown;
|
|
}
|
|
|
|
return config0 & MIPS_CONF_M;
|
|
|
|
unknown:
|
|
panic(unknown_isa, config0);
|
|
}
|
|
|
|
static inline unsigned int decode_config1(struct cpuinfo_mips *c)
|
|
{
|
|
unsigned int config1;
|
|
|
|
config1 = read_c0_config1();
|
|
|
|
if (config1 & MIPS_CONF1_MD)
|
|
c->ases |= MIPS_ASE_MDMX;
|
|
if (config1 & MIPS_CONF1_WR)
|
|
c->options |= MIPS_CPU_WATCH;
|
|
if (config1 & MIPS_CONF1_CA)
|
|
c->ases |= MIPS_ASE_MIPS16;
|
|
if (config1 & MIPS_CONF1_EP)
|
|
c->options |= MIPS_CPU_EJTAG;
|
|
if (config1 & MIPS_CONF1_FP) {
|
|
c->options |= MIPS_CPU_FPU;
|
|
c->options |= MIPS_CPU_32FPR;
|
|
}
|
|
if (cpu_has_tlb)
|
|
c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
|
|
|
|
return config1 & MIPS_CONF_M;
|
|
}
|
|
|
|
static inline unsigned int decode_config2(struct cpuinfo_mips *c)
|
|
{
|
|
unsigned int config2;
|
|
|
|
config2 = read_c0_config2();
|
|
|
|
if (config2 & MIPS_CONF2_SL)
|
|
c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
|
|
|
|
return config2 & MIPS_CONF_M;
|
|
}
|
|
|
|
static inline unsigned int decode_config3(struct cpuinfo_mips *c)
|
|
{
|
|
unsigned int config3;
|
|
|
|
config3 = read_c0_config3();
|
|
|
|
if (config3 & MIPS_CONF3_SM)
|
|
c->ases |= MIPS_ASE_SMARTMIPS;
|
|
if (config3 & MIPS_CONF3_DSP)
|
|
c->ases |= MIPS_ASE_DSP;
|
|
if (config3 & MIPS_CONF3_VINT)
|
|
c->options |= MIPS_CPU_VINT;
|
|
if (config3 & MIPS_CONF3_VEIC)
|
|
c->options |= MIPS_CPU_VEIC;
|
|
if (config3 & MIPS_CONF3_MT)
|
|
c->ases |= MIPS_ASE_MIPSMT;
|
|
if (config3 & MIPS_CONF3_ULRI)
|
|
c->options |= MIPS_CPU_ULRI;
|
|
|
|
return config3 & MIPS_CONF_M;
|
|
}
|
|
|
|
static void __init decode_configs(struct cpuinfo_mips *c)
|
|
{
|
|
/* MIPS32 or MIPS64 compliant CPU. */
|
|
c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | 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);
|
|
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:
|
|
case PRID_IMP_4KSD:
|
|
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:
|
|
case PRID_IMP_24KE:
|
|
c->cputype = CPU_24K;
|
|
break;
|
|
case PRID_IMP_25KF:
|
|
c->cputype = CPU_25KF;
|
|
break;
|
|
case PRID_IMP_34K:
|
|
c->cputype = CPU_34K;
|
|
break;
|
|
case PRID_IMP_74K:
|
|
c->cputype = CPU_74K;
|
|
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;
|
|
/* FPU in pass1 is known to have issues. */
|
|
if ((c->processor_id & 0xff) < 0x02)
|
|
c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
|
|
break;
|
|
case PRID_IMP_SB1A:
|
|
c->cputype = CPU_SB1A;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_SR71000:
|
|
c->cputype = CPU_SR71000;
|
|
c->scache.ways = 8;
|
|
c->tlbsize = 64;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void cpu_probe_philips(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_PR4450:
|
|
c->cputype = CPU_PR4450;
|
|
c->isa_level = MIPS_CPU_ISA_M32R1;
|
|
break;
|
|
default:
|
|
panic("Unknown Philips Core!"); /* REVISIT: die? */
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static inline void cpu_probe_broadcom(struct cpuinfo_mips *c)
|
|
{
|
|
decode_configs(c);
|
|
switch (c->processor_id & 0xff00) {
|
|
case PRID_IMP_BCM3302:
|
|
c->cputype = CPU_BCM3302;
|
|
break;
|
|
case PRID_IMP_BCM4710:
|
|
c->cputype = CPU_BCM4710;
|
|
break;
|
|
default:
|
|
c->cputype = CPU_UNKNOWN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
const char *__cpu_name[NR_CPUS];
|
|
|
|
/*
|
|
* Name a CPU
|
|
*/
|
|
static __init const char *cpu_to_name(struct cpuinfo_mips *c)
|
|
{
|
|
const char *name = NULL;
|
|
|
|
switch (c->cputype) {
|
|
case CPU_UNKNOWN: name = "unknown"; break;
|
|
case CPU_R2000: name = "R2000"; break;
|
|
case CPU_R3000: name = "R3000"; break;
|
|
case CPU_R3000A: name = "R3000A"; break;
|
|
case CPU_R3041: name = "R3041"; break;
|
|
case CPU_R3051: name = "R3051"; break;
|
|
case CPU_R3052: name = "R3052"; break;
|
|
case CPU_R3081: name = "R3081"; break;
|
|
case CPU_R3081E: name = "R3081E"; break;
|
|
case CPU_R4000PC: name = "R4000PC"; break;
|
|
case CPU_R4000SC: name = "R4000SC"; break;
|
|
case CPU_R4000MC: name = "R4000MC"; break;
|
|
case CPU_R4200: name = "R4200"; break;
|
|
case CPU_R4400PC: name = "R4400PC"; break;
|
|
case CPU_R4400SC: name = "R4400SC"; break;
|
|
case CPU_R4400MC: name = "R4400MC"; break;
|
|
case CPU_R4600: name = "R4600"; break;
|
|
case CPU_R6000: name = "R6000"; break;
|
|
case CPU_R6000A: name = "R6000A"; break;
|
|
case CPU_R8000: name = "R8000"; break;
|
|
case CPU_R10000: name = "R10000"; break;
|
|
case CPU_R12000: name = "R12000"; break;
|
|
case CPU_R14000: name = "R14000"; break;
|
|
case CPU_R4300: name = "R4300"; break;
|
|
case CPU_R4650: name = "R4650"; break;
|
|
case CPU_R4700: name = "R4700"; break;
|
|
case CPU_R5000: name = "R5000"; break;
|
|
case CPU_R5000A: name = "R5000A"; break;
|
|
case CPU_R4640: name = "R4640"; break;
|
|
case CPU_NEVADA: name = "Nevada"; break;
|
|
case CPU_RM7000: name = "RM7000"; break;
|
|
case CPU_RM9000: name = "RM9000"; break;
|
|
case CPU_R5432: name = "R5432"; break;
|
|
case CPU_4KC: name = "MIPS 4Kc"; break;
|
|
case CPU_5KC: name = "MIPS 5Kc"; break;
|
|
case CPU_R4310: name = "R4310"; break;
|
|
case CPU_SB1: name = "SiByte SB1"; break;
|
|
case CPU_SB1A: name = "SiByte SB1A"; break;
|
|
case CPU_TX3912: name = "TX3912"; break;
|
|
case CPU_TX3922: name = "TX3922"; break;
|
|
case CPU_TX3927: name = "TX3927"; break;
|
|
case CPU_AU1000: name = "Au1000"; break;
|
|
case CPU_AU1500: name = "Au1500"; break;
|
|
case CPU_AU1100: name = "Au1100"; break;
|
|
case CPU_AU1550: name = "Au1550"; break;
|
|
case CPU_AU1200: name = "Au1200"; break;
|
|
case CPU_4KEC: name = "MIPS 4KEc"; break;
|
|
case CPU_4KSC: name = "MIPS 4KSc"; break;
|
|
case CPU_VR41XX: name = "NEC Vr41xx"; break;
|
|
case CPU_R5500: name = "R5500"; break;
|
|
case CPU_TX49XX: name = "TX49xx"; break;
|
|
case CPU_20KC: name = "MIPS 20Kc"; break;
|
|
case CPU_24K: name = "MIPS 24K"; break;
|
|
case CPU_25KF: name = "MIPS 25Kf"; break;
|
|
case CPU_34K: name = "MIPS 34K"; break;
|
|
case CPU_74K: name = "MIPS 74K"; break;
|
|
case CPU_VR4111: name = "NEC VR4111"; break;
|
|
case CPU_VR4121: name = "NEC VR4121"; break;
|
|
case CPU_VR4122: name = "NEC VR4122"; break;
|
|
case CPU_VR4131: name = "NEC VR4131"; break;
|
|
case CPU_VR4133: name = "NEC VR4133"; break;
|
|
case CPU_VR4181: name = "NEC VR4181"; break;
|
|
case CPU_VR4181A: name = "NEC VR4181A"; break;
|
|
case CPU_SR71000: name = "Sandcraft SR71000"; break;
|
|
case CPU_BCM3302: name = "Broadcom BCM3302"; break;
|
|
case CPU_BCM4710: name = "Broadcom BCM4710"; break;
|
|
case CPU_PR4450: name = "Philips PR4450"; break;
|
|
case CPU_LOONGSON2: name = "ICT Loongson-2"; break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return name;
|
|
}
|
|
|
|
__init void cpu_probe(void)
|
|
{
|
|
struct cpuinfo_mips *c = ¤t_cpu_data;
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
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_BROADCOM:
|
|
cpu_probe_broadcom(c);
|
|
break;
|
|
case PRID_COMP_SANDCRAFT:
|
|
cpu_probe_sandcraft(c);
|
|
break;
|
|
case PRID_COMP_PHILIPS:
|
|
cpu_probe_philips(c);
|
|
break;
|
|
default:
|
|
c->cputype = CPU_UNKNOWN;
|
|
}
|
|
|
|
/*
|
|
* Platform code can force the cpu type to optimize code
|
|
* generation. In that case be sure the cpu type is correctly
|
|
* manually setup otherwise it could trigger some nasty bugs.
|
|
*/
|
|
BUG_ON(current_cpu_type() != c->cputype);
|
|
|
|
if (c->options & MIPS_CPU_FPU) {
|
|
c->fpu_id = cpu_get_fpu_id();
|
|
|
|
if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
|
|
c->isa_level == MIPS_CPU_ISA_M32R2 ||
|
|
c->isa_level == MIPS_CPU_ISA_M64R1 ||
|
|
c->isa_level == MIPS_CPU_ISA_M64R2) {
|
|
if (c->fpu_id & MIPS_FPIR_3D)
|
|
c->ases |= MIPS_ASE_MIPS3D;
|
|
}
|
|
}
|
|
|
|
__cpu_name[cpu] = cpu_to_name(c);
|
|
}
|
|
|
|
__init void cpu_report(void)
|
|
{
|
|
struct cpuinfo_mips *c = ¤t_cpu_data;
|
|
|
|
printk(KERN_INFO "CPU revision is: %08x (%s)\n",
|
|
c->processor_id, cpu_name_string());
|
|
if (c->options & MIPS_CPU_FPU)
|
|
printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
|
|
}
|