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Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
-rw-r--r--arch/mips/kernel/cpu-probe.c1188
1 files changed, 1188 insertions, 0 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
new file mode 100644
index 00000000..5099201f
--- /dev/null
+++ b/arch/mips/kernel/cpu-probe.c
@@ -0,0 +1,1188 @@
+/*
+ * Processor capabilities determination functions.
+ *
+ * Copyright (C) xxxx the Anonymous
+ * Copyright (C) 1994 - 2006 Ralf Baechle
+ * Copyright (C) 2003, 2004 Maciej W. Rozycki
+ * Copyright (C) 2001, 2004 MIPS Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/export.h>
+
+#include <asm/bugs.h>
+#include <asm/cpu.h>
+#include <asm/fpu.h>
+#include <asm/mipsregs.h>
+#include <asm/watch.h>
+#include <asm/elf.h>
+#include <asm/spram.h>
+#include <asm/uaccess.h>
+
+/*
+ * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
+ * the implementation of the "wait" feature differs between CPU families. This
+ * points to the function that implements CPU specific wait.
+ * The wait instruction stops the pipeline and reduces the power consumption of
+ * the CPU very much.
+ */
+void (*cpu_wait)(void);
+EXPORT_SYMBOL(cpu_wait);
+
+static void r3081_wait(void)
+{
+ unsigned long cfg = read_c0_conf();
+ write_c0_conf(cfg | R30XX_CONF_HALT);
+}
+
+static void r39xx_wait(void)
+{
+ local_irq_disable();
+ if (!need_resched())
+ write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
+ local_irq_enable();
+}
+
+extern void r4k_wait(void);
+
+/*
+ * This variant is preferable as it allows testing need_resched and going to
+ * sleep depending on the outcome atomically. Unfortunately the "It is
+ * implementation-dependent whether the pipeline restarts when a non-enabled
+ * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
+ * using this version a gamble.
+ */
+void r4k_wait_irqoff(void)
+{
+ local_irq_disable();
+ if (!need_resched())
+ __asm__(" .set push \n"
+ " .set mips3 \n"
+ " wait \n"
+ " .set pop \n");
+ local_irq_enable();
+ __asm__(" .globl __pastwait \n"
+ "__pastwait: \n");
+}
+
+/*
+ * The RM7000 variant has to handle erratum 38. The workaround is to not
+ * have any pending stores when the WAIT instruction is executed.
+ */
+static void rm7k_wait_irqoff(void)
+{
+ local_irq_disable();
+ if (!need_resched())
+ __asm__(
+ " .set push \n"
+ " .set mips3 \n"
+ " .set noat \n"
+ " mfc0 $1, $12 \n"
+ " sync \n"
+ " mtc0 $1, $12 # stalls until W stage \n"
+ " wait \n"
+ " mtc0 $1, $12 # stalls until W stage \n"
+ " .set pop \n");
+ local_irq_enable();
+}
+
+/*
+ * The Au1xxx wait is available only if using 32khz counter or
+ * external timer source, but specifically not CP0 Counter.
+ * alchemy/common/time.c may override cpu_wait!
+ */
+static void au1k_wait(void)
+{
+ __asm__(" .set mips3 \n"
+ " cache 0x14, 0(%0) \n"
+ " cache 0x14, 32(%0) \n"
+ " sync \n"
+ " nop \n"
+ " wait \n"
+ " nop \n"
+ " nop \n"
+ " nop \n"
+ " nop \n"
+ " .set mips0 \n"
+ : : "r" (au1k_wait));
+}
+
+static int __initdata nowait;
+
+static int __init wait_disable(char *s)
+{
+ nowait = 1;
+
+ return 1;
+}
+
+__setup("nowait", wait_disable);
+
+static int __cpuinitdata mips_fpu_disabled;
+
+static int __init fpu_disable(char *s)
+{
+ cpu_data[0].options &= ~MIPS_CPU_FPU;
+ mips_fpu_disabled = 1;
+
+ return 1;
+}
+
+__setup("nofpu", fpu_disable);
+
+int __cpuinitdata mips_dsp_disabled;
+
+static int __init dsp_disable(char *s)
+{
+ cpu_data[0].ases &= ~MIPS_ASE_DSP;
+ mips_dsp_disabled = 1;
+
+ return 1;
+}
+
+__setup("nodsp", dsp_disable);
+
+void __init check_wait(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+
+ if (nowait) {
+ printk("Wait instruction disabled.\n");
+ return;
+ }
+
+ switch (c->cputype) {
+ case CPU_R3081:
+ case CPU_R3081E:
+ cpu_wait = r3081_wait;
+ break;
+ case CPU_TX3927:
+ cpu_wait = r39xx_wait;
+ break;
+ case CPU_R4200:
+/* case CPU_R4300: */
+ case CPU_R4600:
+ case CPU_R4640:
+ case CPU_R4650:
+ case CPU_R4700:
+ case CPU_R5000:
+ case CPU_R5500:
+ case CPU_NEVADA:
+ case CPU_4KC:
+ case CPU_4KEC:
+ case CPU_4KSC:
+ case CPU_5KC:
+ case CPU_25KF:
+ case CPU_PR4450:
+ case CPU_BMIPS3300:
+ case CPU_BMIPS4350:
+ case CPU_BMIPS4380:
+ case CPU_BMIPS5000:
+ case CPU_CAVIUM_OCTEON:
+ case CPU_CAVIUM_OCTEON_PLUS:
+ case CPU_CAVIUM_OCTEON2:
+ case CPU_JZRISC:
+ case CPU_XLR:
+ case CPU_XLP:
+ cpu_wait = r4k_wait;
+ break;
+
+ case CPU_RM7000:
+ cpu_wait = rm7k_wait_irqoff;
+ break;
+
+ case CPU_24K:
+ case CPU_34K:
+ case CPU_1004K:
+ cpu_wait = r4k_wait;
+ if (read_c0_config7() & MIPS_CONF7_WII)
+ cpu_wait = r4k_wait_irqoff;
+ break;
+
+ case CPU_74K:
+ cpu_wait = r4k_wait;
+ if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
+ cpu_wait = r4k_wait_irqoff;
+ break;
+
+ case CPU_TX49XX:
+ cpu_wait = r4k_wait_irqoff;
+ break;
+ case CPU_ALCHEMY:
+ cpu_wait = au1k_wait;
+ break;
+ case CPU_20KC:
+ /*
+ * WAIT on Rev1.0 has E1, E2, E3 and E16.
+ * WAIT on Rev2.0 and Rev3.0 has E16.
+ * Rev3.1 WAIT is nop, why bother
+ */
+ if ((c->processor_id & 0xff) <= 0x64)
+ break;
+
+ /*
+ * Another rev is incremeting c0_count at a reduced clock
+ * rate while in WAIT mode. So we basically have the choice
+ * between using the cp0 timer as clocksource or avoiding
+ * the WAIT instruction. Until more details are known,
+ * disable the use of WAIT for 20Kc entirely.
+ cpu_wait = r4k_wait;
+ */
+ break;
+ case CPU_RM9000:
+ if ((c->processor_id & 0x00ff) >= 0x40)
+ cpu_wait = r4k_wait;
+ break;
+ default:
+ break;
+ }
+}
+
+static inline void check_errata(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+
+ switch (c->cputype) {
+ case CPU_34K:
+ /*
+ * Erratum "RPS May Cause Incorrect Instruction Execution"
+ * This code only handles VPE0, any SMP/SMTC/RTOS code
+ * making use of VPE1 will be responsable for that VPE.
+ */
+ if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
+ write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
+ break;
+ default:
+ break;
+ }
+}
+
+void __init check_bugs32(void)
+{
+ check_errata();
+}
+
+/*
+ * Probe whether cpu has config register by trying to play with
+ * alternate cache bit and see whether it matters.
+ * It's used by cpu_probe to distinguish between R3000A and R3081.
+ */
+static inline int cpu_has_confreg(void)
+{
+#ifdef CONFIG_CPU_R3000
+ extern unsigned long r3k_cache_size(unsigned long);
+ unsigned long size1, size2;
+ unsigned long cfg = read_c0_conf();
+
+ size1 = r3k_cache_size(ST0_ISC);
+ write_c0_conf(cfg ^ R30XX_CONF_AC);
+ size2 = r3k_cache_size(ST0_ISC);
+ write_c0_conf(cfg);
+ return size1 != size2;
+#else
+ return 0;
+#endif
+}
+
+static inline void set_elf_platform(int cpu, const char *plat)
+{
+ if (cpu == 0)
+ __elf_platform = plat;
+}
+
+/*
+ * Get the FPU Implementation/Revision.
+ */
+static inline unsigned long cpu_get_fpu_id(void)
+{
+ unsigned long tmp, fpu_id;
+
+ tmp = read_c0_status();
+ __enable_fpu();
+ fpu_id = read_32bit_cp1_register(CP1_REVISION);
+ write_c0_status(tmp);
+ return fpu_id;
+}
+
+/*
+ * Check the CPU has an FPU the official way.
+ */
+static inline int __cpu_has_fpu(void)
+{
+ return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
+}
+
+static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
+{
+#ifdef __NEED_VMBITS_PROBE
+ write_c0_entryhi(0x3fffffffffffe000ULL);
+ back_to_back_c0_hazard();
+ c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
+#endif
+}
+
+#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
+ | MIPS_CPU_COUNTER)
+
+static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_R2000:
+ c->cputype = CPU_R2000;
+ __cpu_name[cpu] = "R2000";
+ c->isa_level = MIPS_CPU_ISA_I;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
+ MIPS_CPU_NOFPUEX;
+ if (__cpu_has_fpu())
+ c->options |= MIPS_CPU_FPU;
+ c->tlbsize = 64;
+ break;
+ case PRID_IMP_R3000:
+ if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
+ if (cpu_has_confreg()) {
+ c->cputype = CPU_R3081E;
+ __cpu_name[cpu] = "R3081";
+ } else {
+ c->cputype = CPU_R3000A;
+ __cpu_name[cpu] = "R3000A";
+ }
+ break;
+ } else {
+ c->cputype = CPU_R3000;
+ __cpu_name[cpu] = "R3000";
+ }
+ c->isa_level = MIPS_CPU_ISA_I;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
+ MIPS_CPU_NOFPUEX;
+ if (__cpu_has_fpu())
+ c->options |= MIPS_CPU_FPU;
+ c->tlbsize = 64;
+ break;
+ case PRID_IMP_R4000:
+ if (read_c0_config() & CONF_SC) {
+ if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
+ c->cputype = CPU_R4400PC;
+ __cpu_name[cpu] = "R4400PC";
+ } else {
+ c->cputype = CPU_R4000PC;
+ __cpu_name[cpu] = "R4000PC";
+ }
+ } else {
+ if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
+ c->cputype = CPU_R4400SC;
+ __cpu_name[cpu] = "R4400SC";
+ } else {
+ c->cputype = CPU_R4000SC;
+ __cpu_name[cpu] = "R4000SC";
+ }
+ }
+
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_WATCH | MIPS_CPU_VCE |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_VR41XX:
+ switch (c->processor_id & 0xf0) {
+ case PRID_REV_VR4111:
+ c->cputype = CPU_VR4111;
+ __cpu_name[cpu] = "NEC VR4111";
+ break;
+ case PRID_REV_VR4121:
+ c->cputype = CPU_VR4121;
+ __cpu_name[cpu] = "NEC VR4121";
+ break;
+ case PRID_REV_VR4122:
+ if ((c->processor_id & 0xf) < 0x3) {
+ c->cputype = CPU_VR4122;
+ __cpu_name[cpu] = "NEC VR4122";
+ } else {
+ c->cputype = CPU_VR4181A;
+ __cpu_name[cpu] = "NEC VR4181A";
+ }
+ break;
+ case PRID_REV_VR4130:
+ if ((c->processor_id & 0xf) < 0x4) {
+ c->cputype = CPU_VR4131;
+ __cpu_name[cpu] = "NEC VR4131";
+ } else {
+ c->cputype = CPU_VR4133;
+ __cpu_name[cpu] = "NEC VR4133";
+ }
+ break;
+ default:
+ printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
+ c->cputype = CPU_VR41XX;
+ __cpu_name[cpu] = "NEC Vr41xx";
+ break;
+ }
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS;
+ c->tlbsize = 32;
+ break;
+ case PRID_IMP_R4300:
+ c->cputype = CPU_R4300;
+ __cpu_name[cpu] = "R4300";
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 32;
+ break;
+ case PRID_IMP_R4600:
+ c->cputype = CPU_R4600;
+ __cpu_name[cpu] = "R4600";
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ #if 0
+ case PRID_IMP_R4650:
+ /*
+ * This processor doesn't have an MMU, so it's not
+ * "real easy" to run Linux on it. It is left purely
+ * for documentation. Commented out because it shares
+ * it's c0_prid id number with the TX3900.
+ */
+ c->cputype = CPU_R4650;
+ __cpu_name[cpu] = "R4650";
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ #endif
+ case PRID_IMP_TX39:
+ c->isa_level = MIPS_CPU_ISA_I;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
+
+ if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
+ c->cputype = CPU_TX3927;
+ __cpu_name[cpu] = "TX3927";
+ c->tlbsize = 64;
+ } else {
+ switch (c->processor_id & 0xff) {
+ case PRID_REV_TX3912:
+ c->cputype = CPU_TX3912;
+ __cpu_name[cpu] = "TX3912";
+ c->tlbsize = 32;
+ break;
+ case PRID_REV_TX3922:
+ c->cputype = CPU_TX3922;
+ __cpu_name[cpu] = "TX3922";
+ c->tlbsize = 64;
+ break;
+ }
+ }
+ break;
+ case PRID_IMP_R4700:
+ c->cputype = CPU_R4700;
+ __cpu_name[cpu] = "R4700";
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_TX49:
+ c->cputype = CPU_TX49XX;
+ __cpu_name[cpu] = "R49XX";
+ c->isa_level = MIPS_CPU_ISA_III;
+ c->options = R4K_OPTS | MIPS_CPU_LLSC;
+ if (!(c->processor_id & 0x08))
+ c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R5000:
+ c->cputype = CPU_R5000;
+ __cpu_name[cpu] = "R5000";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R5432:
+ c->cputype = CPU_R5432;
+ __cpu_name[cpu] = "R5432";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_WATCH | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R5500:
+ c->cputype = CPU_R5500;
+ __cpu_name[cpu] = "R5500";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_WATCH | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_NEVADA:
+ c->cputype = CPU_NEVADA;
+ __cpu_name[cpu] = "Nevada";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R6000:
+ c->cputype = CPU_R6000;
+ __cpu_name[cpu] = "R6000";
+ c->isa_level = MIPS_CPU_ISA_II;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 32;
+ break;
+ case PRID_IMP_R6000A:
+ c->cputype = CPU_R6000A;
+ __cpu_name[cpu] = "R6000A";
+ c->isa_level = MIPS_CPU_ISA_II;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 32;
+ break;
+ case PRID_IMP_RM7000:
+ c->cputype = CPU_RM7000;
+ __cpu_name[cpu] = "RM7000";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ /*
+ * Undocumented RM7000: Bit 29 in the info register of
+ * the RM7000 v2.0 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_RM9000:
+ c->cputype = CPU_RM9000;
+ __cpu_name[cpu] = "RM9000";
+ c->isa_level = MIPS_CPU_ISA_IV;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ /*
+ * 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;
+ __cpu_name[cpu] = "RM8000";
+ 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;
+ __cpu_name[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;
+ __cpu_name[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;
+ __cpu_name[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;
+ __cpu_name[cpu] = "ICT Loongson-2";
+
+ switch (c->processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON2E:
+ set_elf_platform(cpu, "loongson2e");
+ break;
+ case PRID_REV_LOONGSON2F:
+ set_elf_platform(cpu, "loongson2f");
+ break;
+ }
+
+ 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[] __cpuinitdata = 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 inline unsigned int decode_config4(struct cpuinfo_mips *c)
+{
+ unsigned int config4;
+
+ config4 = read_c0_config4();
+
+ if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT
+ && cpu_has_tlb)
+ c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
+
+ c->kscratch_mask = (config4 >> 16) & 0xff;
+
+ return config4 & MIPS_CONF_M;
+}
+
+static void __cpuinit decode_configs(struct cpuinfo_mips *c)
+{
+ int ok;
+
+ /* 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;
+
+ ok = decode_config0(c); /* Read Config registers. */
+ BUG_ON(!ok); /* Arch spec violation! */
+ if (ok)
+ ok = decode_config1(c);
+ if (ok)
+ ok = decode_config2(c);
+ if (ok)
+ ok = decode_config3(c);
+ if (ok)
+ ok = decode_config4(c);
+
+ mips_probe_watch_registers(c);
+
+ if (cpu_has_mips_r2)
+ c->core = read_c0_ebase() & 0x3ff;
+}
+
+static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_4KC:
+ c->cputype = CPU_4KC;
+ __cpu_name[cpu] = "MIPS 4Kc";
+ break;
+ case PRID_IMP_4KEC:
+ case PRID_IMP_4KECR2:
+ c->cputype = CPU_4KEC;
+ __cpu_name[cpu] = "MIPS 4KEc";
+ break;
+ case PRID_IMP_4KSC:
+ case PRID_IMP_4KSD:
+ c->cputype = CPU_4KSC;
+ __cpu_name[cpu] = "MIPS 4KSc";
+ break;
+ case PRID_IMP_5KC:
+ c->cputype = CPU_5KC;
+ __cpu_name[cpu] = "MIPS 5Kc";
+ break;
+ case PRID_IMP_20KC:
+ c->cputype = CPU_20KC;
+ __cpu_name[cpu] = "MIPS 20Kc";
+ break;
+ case PRID_IMP_24K:
+ case PRID_IMP_24KE:
+ c->cputype = CPU_24K;
+ __cpu_name[cpu] = "MIPS 24Kc";
+ break;
+ case PRID_IMP_25KF:
+ c->cputype = CPU_25KF;
+ __cpu_name[cpu] = "MIPS 25Kc";
+ break;
+ case PRID_IMP_34K:
+ c->cputype = CPU_34K;
+ __cpu_name[cpu] = "MIPS 34Kc";
+ break;
+ case PRID_IMP_74K:
+ c->cputype = CPU_74K;
+ __cpu_name[cpu] = "MIPS 74Kc";
+ break;
+ case PRID_IMP_1004K:
+ c->cputype = CPU_1004K;
+ __cpu_name[cpu] = "MIPS 1004Kc";
+ break;
+ }
+
+ spram_config();
+}
+
+static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_AU1_REV1:
+ case PRID_IMP_AU1_REV2:
+ c->cputype = CPU_ALCHEMY;
+ switch ((c->processor_id >> 24) & 0xff) {
+ case 0:
+ __cpu_name[cpu] = "Au1000";
+ break;
+ case 1:
+ __cpu_name[cpu] = "Au1500";
+ break;
+ case 2:
+ __cpu_name[cpu] = "Au1100";
+ break;
+ case 3:
+ __cpu_name[cpu] = "Au1550";
+ break;
+ case 4:
+ __cpu_name[cpu] = "Au1200";
+ if ((c->processor_id & 0xff) == 2)
+ __cpu_name[cpu] = "Au1250";
+ break;
+ case 5:
+ __cpu_name[cpu] = "Au1210";
+ break;
+ default:
+ __cpu_name[cpu] = "Au1xxx";
+ break;
+ }
+ break;
+ }
+}
+
+static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_SB1:
+ c->cputype = CPU_SB1;
+ __cpu_name[cpu] = "SiByte 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;
+ __cpu_name[cpu] = "SiByte SB1A";
+ break;
+ }
+}
+
+static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_SR71000:
+ c->cputype = CPU_SR71000;
+ __cpu_name[cpu] = "Sandcraft SR71000";
+ c->scache.ways = 8;
+ c->tlbsize = 64;
+ break;
+ }
+}
+
+static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_PR4450:
+ c->cputype = CPU_PR4450;
+ __cpu_name[cpu] = "Philips PR4450";
+ c->isa_level = MIPS_CPU_ISA_M32R1;
+ break;
+ }
+}
+
+static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_BMIPS32_REV4:
+ case PRID_IMP_BMIPS32_REV8:
+ c->cputype = CPU_BMIPS32;
+ __cpu_name[cpu] = "Broadcom BMIPS32";
+ set_elf_platform(cpu, "bmips32");
+ break;
+ case PRID_IMP_BMIPS3300:
+ case PRID_IMP_BMIPS3300_ALT:
+ case PRID_IMP_BMIPS3300_BUG:
+ c->cputype = CPU_BMIPS3300;
+ __cpu_name[cpu] = "Broadcom BMIPS3300";
+ set_elf_platform(cpu, "bmips3300");
+ break;
+ case PRID_IMP_BMIPS43XX: {
+ int rev = c->processor_id & 0xff;
+
+ if (rev >= PRID_REV_BMIPS4380_LO &&
+ rev <= PRID_REV_BMIPS4380_HI) {
+ c->cputype = CPU_BMIPS4380;
+ __cpu_name[cpu] = "Broadcom BMIPS4380";
+ set_elf_platform(cpu, "bmips4380");
+ } else {
+ c->cputype = CPU_BMIPS4350;
+ __cpu_name[cpu] = "Broadcom BMIPS4350";
+ set_elf_platform(cpu, "bmips4350");
+ }
+ break;
+ }
+ case PRID_IMP_BMIPS5000:
+ c->cputype = CPU_BMIPS5000;
+ __cpu_name[cpu] = "Broadcom BMIPS5000";
+ set_elf_platform(cpu, "bmips5000");
+ c->options |= MIPS_CPU_ULRI;
+ break;
+ }
+}
+
+static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_CAVIUM_CN38XX:
+ case PRID_IMP_CAVIUM_CN31XX:
+ case PRID_IMP_CAVIUM_CN30XX:
+ c->cputype = CPU_CAVIUM_OCTEON;
+ __cpu_name[cpu] = "Cavium Octeon";
+ goto platform;
+ case PRID_IMP_CAVIUM_CN58XX:
+ case PRID_IMP_CAVIUM_CN56XX:
+ case PRID_IMP_CAVIUM_CN50XX:
+ case PRID_IMP_CAVIUM_CN52XX:
+ c->cputype = CPU_CAVIUM_OCTEON_PLUS;
+ __cpu_name[cpu] = "Cavium Octeon+";
+platform:
+ set_elf_platform(cpu, "octeon");
+ break;
+ case PRID_IMP_CAVIUM_CN61XX:
+ case PRID_IMP_CAVIUM_CN63XX:
+ case PRID_IMP_CAVIUM_CN66XX:
+ case PRID_IMP_CAVIUM_CN68XX:
+ c->cputype = CPU_CAVIUM_OCTEON2;
+ __cpu_name[cpu] = "Cavium Octeon II";
+ set_elf_platform(cpu, "octeon2");
+ break;
+ default:
+ printk(KERN_INFO "Unknown Octeon chip!\n");
+ c->cputype = CPU_UNKNOWN;
+ break;
+ }
+}
+
+static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ /* JZRISC does not implement the CP0 counter. */
+ c->options &= ~MIPS_CPU_COUNTER;
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_JZRISC:
+ c->cputype = CPU_JZRISC;
+ __cpu_name[cpu] = "Ingenic JZRISC";
+ break;
+ default:
+ panic("Unknown Ingenic Processor ID!");
+ break;
+ }
+}
+
+static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
+{
+ decode_configs(c);
+
+ if ((c->processor_id & 0xff00) == PRID_IMP_NETLOGIC_AU13XX) {
+ c->cputype = CPU_ALCHEMY;
+ __cpu_name[cpu] = "Au1300";
+ /* following stuff is not for Alchemy */
+ return;
+ }
+
+ c->options = (MIPS_CPU_TLB |
+ MIPS_CPU_4KEX |
+ MIPS_CPU_COUNTER |
+ MIPS_CPU_DIVEC |
+ MIPS_CPU_WATCH |
+ MIPS_CPU_EJTAG |
+ MIPS_CPU_LLSC);
+
+ switch (c->processor_id & 0xff00) {
+ case PRID_IMP_NETLOGIC_XLP8XX:
+ case PRID_IMP_NETLOGIC_XLP3XX:
+ c->cputype = CPU_XLP;
+ __cpu_name[cpu] = "Netlogic XLP";
+ break;
+
+ case PRID_IMP_NETLOGIC_XLR732:
+ case PRID_IMP_NETLOGIC_XLR716:
+ case PRID_IMP_NETLOGIC_XLR532:
+ case PRID_IMP_NETLOGIC_XLR308:
+ case PRID_IMP_NETLOGIC_XLR532C:
+ case PRID_IMP_NETLOGIC_XLR516C:
+ case PRID_IMP_NETLOGIC_XLR508C:
+ case PRID_IMP_NETLOGIC_XLR308C:
+ c->cputype = CPU_XLR;
+ __cpu_name[cpu] = "Netlogic XLR";
+ break;
+
+ case PRID_IMP_NETLOGIC_XLS608:
+ case PRID_IMP_NETLOGIC_XLS408:
+ case PRID_IMP_NETLOGIC_XLS404:
+ case PRID_IMP_NETLOGIC_XLS208:
+ case PRID_IMP_NETLOGIC_XLS204:
+ case PRID_IMP_NETLOGIC_XLS108:
+ case PRID_IMP_NETLOGIC_XLS104:
+ case PRID_IMP_NETLOGIC_XLS616B:
+ case PRID_IMP_NETLOGIC_XLS608B:
+ case PRID_IMP_NETLOGIC_XLS416B:
+ case PRID_IMP_NETLOGIC_XLS412B:
+ case PRID_IMP_NETLOGIC_XLS408B:
+ case PRID_IMP_NETLOGIC_XLS404B:
+ c->cputype = CPU_XLR;
+ __cpu_name[cpu] = "Netlogic XLS";
+ break;
+
+ default:
+ pr_info("Unknown Netlogic chip id [%02x]!\n",
+ c->processor_id);
+ c->cputype = CPU_XLR;
+ break;
+ }
+
+ if (c->cputype == CPU_XLP) {
+ c->isa_level = MIPS_CPU_ISA_M64R2;
+ c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
+ /* This will be updated again after all threads are woken up */
+ c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
+ } else {
+ c->isa_level = MIPS_CPU_ISA_M64R1;
+ c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
+ }
+}
+
+#ifdef CONFIG_64BIT
+/* For use by uaccess.h */
+u64 __ua_limit;
+EXPORT_SYMBOL(__ua_limit);
+#endif
+
+const char *__cpu_name[NR_CPUS];
+const char *__elf_platform;
+
+__cpuinit void cpu_probe(void)
+{
+ struct cpuinfo_mips *c = &current_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, cpu);
+ break;
+ case PRID_COMP_MIPS:
+ cpu_probe_mips(c, cpu);
+ break;
+ case PRID_COMP_ALCHEMY:
+ cpu_probe_alchemy(c, cpu);
+ break;
+ case PRID_COMP_SIBYTE:
+ cpu_probe_sibyte(c, cpu);
+ break;
+ case PRID_COMP_BROADCOM:
+ cpu_probe_broadcom(c, cpu);
+ break;
+ case PRID_COMP_SANDCRAFT:
+ cpu_probe_sandcraft(c, cpu);
+ break;
+ case PRID_COMP_NXP:
+ cpu_probe_nxp(c, cpu);
+ break;
+ case PRID_COMP_CAVIUM:
+ cpu_probe_cavium(c, cpu);
+ break;
+ case PRID_COMP_INGENIC:
+ cpu_probe_ingenic(c, cpu);
+ break;
+ case PRID_COMP_NETLOGIC:
+ cpu_probe_netlogic(c, cpu);
+ break;
+ }
+
+ BUG_ON(!__cpu_name[cpu]);
+ BUG_ON(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 (mips_fpu_disabled)
+ c->options &= ~MIPS_CPU_FPU;
+
+ if (mips_dsp_disabled)
+ c->ases &= ~MIPS_ASE_DSP;
+
+ 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;
+ }
+ }
+
+ if (cpu_has_mips_r2)
+ c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
+ else
+ c->srsets = 1;
+
+ cpu_probe_vmbits(c);
+
+#ifdef CONFIG_64BIT
+ if (cpu == 0)
+ __ua_limit = ~((1ull << cpu_vmbits) - 1);
+#endif
+}
+
+__cpuinit void cpu_report(void)
+{
+ struct cpuinfo_mips *c = &current_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);
+}
generated by cgit (git 2.34.1) at 2025-01-28 17:50:05 +0000