diff options
Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index d74f957c561e..e34b10be782e 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -54,6 +54,20 @@ static int __init dsp_disable(char *s) __setup("nodsp", dsp_disable); +static int mips_htw_disabled; + +static int __init htw_disable(char *s) +{ + mips_htw_disabled = 1; + cpu_data[0].options &= ~MIPS_CPU_HTW; + write_c0_pwctl(read_c0_pwctl() & + ~(1 << MIPS_PWCTL_PWEN_SHIFT)); + + return 1; +} + +__setup("nohtw", htw_disable); + static inline void check_errata(void) { struct cpuinfo_mips *c = ¤t_cpu_data; @@ -130,14 +144,13 @@ static inline int __cpu_has_fpu(void) static inline unsigned long cpu_get_msa_id(void) { - unsigned long status, conf5, msa_id; + unsigned long status, msa_id; status = read_c0_status(); __enable_fpu(FPU_64BIT); - conf5 = read_c0_config5(); enable_msa(); msa_id = read_msa_ir(); - write_c0_config5(conf5); + disable_msa(); write_c0_status(status); return msa_id; } @@ -321,6 +334,9 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c) c->options |= MIPS_CPU_SEGMENTS; if (config3 & MIPS_CONF3_MSA) c->ases |= MIPS_ASE_MSA; + /* Only tested on 32-bit cores */ + if ((config3 & MIPS_CONF3_PW) && config_enabled(CONFIG_32BIT)) + c->options |= MIPS_CPU_HTW; return config3 & MIPS_CONF_M; } @@ -389,6 +405,8 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c) if (config5 & MIPS_CONF5_EVA) c->options |= MIPS_CPU_EVA; + if (config5 & MIPS_CONF5_MRP) + c->options |= MIPS_CPU_MAAR; return config5 & MIPS_CONF_M; } @@ -421,6 +439,15 @@ static void decode_configs(struct cpuinfo_mips *c) mips_probe_watch_registers(c); + if (cpu_has_rixi) { + /* Enable the RIXI exceptions */ + write_c0_pagegrain(read_c0_pagegrain() | PG_IEC); + back_to_back_c0_hazard(); + /* Verify the IEC bit is set */ + if (read_c0_pagegrain() & PG_IEC) + c->options |= MIPS_CPU_RIXIEX; + } + #ifndef CONFIG_MIPS_CPS if (cpu_has_mips_r2) { c->core = get_ebase_cpunum(); @@ -740,6 +767,12 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu) __cpu_name[cpu] = "ICT Loongson-3"; set_elf_platform(cpu, "loongson3a"); break; + case PRID_REV_LOONGSON3B_R1: + case PRID_REV_LOONGSON3B_R2: + c->cputype = CPU_LOONGSON3; + __cpu_name[cpu] = "ICT Loongson-3"; + set_elf_platform(cpu, "loongson3b"); + break; } set_isa(c, MIPS_CPU_ISA_III); @@ -1187,6 +1220,12 @@ void cpu_probe(void) if (mips_dsp_disabled) c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P); + if (mips_htw_disabled) { + c->options &= ~MIPS_CPU_HTW; + write_c0_pwctl(read_c0_pwctl() & + ~(1 << MIPS_PWCTL_PWEN_SHIFT)); + } + if (c->options & MIPS_CPU_FPU) { c->fpu_id = cpu_get_fpu_id(); |