diff options
Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 171 |
1 files changed, 147 insertions, 24 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index f21a2304401f..6b93162d7c5a 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -28,6 +28,8 @@ #include <asm/spram.h> #include <linux/uaccess.h> +#include <asm/mach-loongson64/cpucfg-emul.h> + /* Hardware capabilities */ unsigned int elf_hwcap __read_mostly; EXPORT_SYMBOL_GPL(elf_hwcap); @@ -92,6 +94,7 @@ static void cpu_set_fpu_2008(struct cpuinfo_mips *c) { if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | + MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { unsigned long sr, fir, fcsr, fcsr0, fcsr1; @@ -172,6 +175,7 @@ static void cpu_set_nofpu_2008(struct cpuinfo_mips *c) case STRICT: if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | + MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY; } else { @@ -263,9 +267,11 @@ static void cpu_set_nofpu_id(struct cpuinfo_mips *c) value = 0; if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | + MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) value |= MIPS_FPIR_D | MIPS_FPIR_S; if (c->isa_level & (MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | + MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W; if (c->options & MIPS_CPU_NAN_2008) @@ -286,6 +292,7 @@ static void cpu_set_fpu_opts(struct cpuinfo_mips *c) if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | + MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 | MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { if (c->fpu_id & MIPS_FPIR_3D) c->ases |= MIPS_ASE_MIPS3D; @@ -532,22 +539,26 @@ static inline void cpu_probe_vmbits(struct cpuinfo_mips *c) static void set_isa(struct cpuinfo_mips *c, unsigned int isa) { switch (isa) { + case MIPS_CPU_ISA_M64R5: + c->isa_level |= MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5; + set_elf_base_platform("mips64r5"); + fallthrough; case MIPS_CPU_ISA_M64R2: c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2; set_elf_base_platform("mips64r2"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_M64R1: c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1; set_elf_base_platform("mips64"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_V: c->isa_level |= MIPS_CPU_ISA_V; set_elf_base_platform("mips5"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_IV: c->isa_level |= MIPS_CPU_ISA_IV; set_elf_base_platform("mips4"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_III: c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III; set_elf_base_platform("mips3"); @@ -557,20 +568,24 @@ static void set_isa(struct cpuinfo_mips *c, unsigned int isa) case MIPS_CPU_ISA_M64R6: c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6; set_elf_base_platform("mips64r6"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_M32R6: c->isa_level |= MIPS_CPU_ISA_M32R6; set_elf_base_platform("mips32r6"); /* Break here so we don't add incompatible ISAs */ break; + case MIPS_CPU_ISA_M32R5: + c->isa_level |= MIPS_CPU_ISA_M32R5; + set_elf_base_platform("mips32r5"); + fallthrough; case MIPS_CPU_ISA_M32R2: c->isa_level |= MIPS_CPU_ISA_M32R2; set_elf_base_platform("mips32r2"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_M32R1: c->isa_level |= MIPS_CPU_ISA_M32R1; set_elf_base_platform("mips32"); - /* fall through */ + fallthrough; case MIPS_CPU_ISA_II: c->isa_level |= MIPS_CPU_ISA_II; set_elf_base_platform("mips2"); @@ -620,14 +635,14 @@ static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) config = read_c0_config6(); if (flags & FTLB_EN) - config |= MIPS_CONF6_FTLBEN; + config |= MIPS_CONF6_MTI_FTLBEN; else - config &= ~MIPS_CONF6_FTLBEN; + config &= ~MIPS_CONF6_MTI_FTLBEN; if (flags & FTLB_SET_PROB) { - config &= ~(3 << MIPS_CONF6_FTLBP_SHIFT); + config &= ~(3 << MIPS_CONF6_MTI_FTLBP_SHIFT); config |= calculate_ftlb_probability(c) - << MIPS_CONF6_FTLBP_SHIFT; + << MIPS_CONF6_MTI_FTLBP_SHIFT; } write_c0_config6(config); @@ -647,10 +662,10 @@ static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) config = read_c0_config6(); if (flags & FTLB_EN) /* Enable FTLB */ - write_c0_config6(config & ~MIPS_CONF6_FTLBDIS); + write_c0_config6(config & ~MIPS_CONF6_LOONGSON_FTLBDIS); else /* Disable FTLB */ - write_c0_config6(config | MIPS_CONF6_FTLBDIS); + write_c0_config6(config | MIPS_CONF6_LOONGSON_FTLBDIS); break; default: return 1; @@ -659,6 +674,52 @@ static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) return 0; } +static int mm_config(struct cpuinfo_mips *c) +{ + unsigned int config0, update, mm; + + config0 = read_c0_config(); + mm = config0 & MIPS_CONF_MM; + + /* + * It's implementation dependent what type of write-merge is supported + * and whether it can be enabled/disabled. If it is settable lets make + * the merging allowed by default. Some platforms might have + * write-through caching unsupported. In this case just ignore the + * CP0.Config.MM bit field value. + */ + switch (c->cputype) { + case CPU_24K: + case CPU_34K: + case CPU_74K: + case CPU_P5600: + case CPU_P6600: + c->options |= MIPS_CPU_MM_FULL; + update = MIPS_CONF_MM_FULL; + break; + case CPU_1004K: + case CPU_1074K: + case CPU_INTERAPTIV: + case CPU_PROAPTIV: + mm = 0; + fallthrough; + default: + update = 0; + break; + } + + if (update) { + config0 = (config0 & ~MIPS_CONF_MM) | update; + write_c0_config(config0); + } else if (mm == MIPS_CONF_MM_SYSAD) { + c->options |= MIPS_CPU_MM_SYSAD; + } else if (mm == MIPS_CONF_MM_FULL) { + c->options |= MIPS_CPU_MM_FULL; + } + + return 0; +} + static inline unsigned int decode_config0(struct cpuinfo_mips *c) { unsigned int config0; @@ -850,7 +911,7 @@ static inline unsigned int decode_config4(struct cpuinfo_mips *c) MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40; c->tlbsize = c->tlbsizevtlb; ftlb_page = MIPS_CONF4_VFTLBPAGESIZE; - /* fall through */ + fallthrough; case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: if (mips_ftlb_disabled) break; @@ -1750,13 +1811,19 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu) spram_config(); + mm_config(c); + switch (__get_cpu_type(c->cputype)) { + case CPU_M5150: + case CPU_P5600: + set_isa(c, MIPS_CPU_ISA_M32R5); + break; case CPU_I6500: c->options |= MIPS_CPU_SHARED_FTLB_ENTRIES; - /* fall-through */ + fallthrough; case CPU_I6400: c->options |= MIPS_CPU_SHARED_FTLB_RAM; - /* fall-through */ + fallthrough; default: break; } @@ -1932,10 +1999,53 @@ platform: } } +#ifdef CONFIG_CPU_LOONGSON64 +#include <loongson_regs.h> + +static inline void decode_cpucfg(struct cpuinfo_mips *c) +{ + u32 cfg1 = read_cpucfg(LOONGSON_CFG1); + u32 cfg2 = read_cpucfg(LOONGSON_CFG2); + u32 cfg3 = read_cpucfg(LOONGSON_CFG3); + + if (cfg1 & LOONGSON_CFG1_MMI) + c->ases |= MIPS_ASE_LOONGSON_MMI; + + if (cfg2 & LOONGSON_CFG2_LEXT1) + c->ases |= MIPS_ASE_LOONGSON_EXT; + + if (cfg2 & LOONGSON_CFG2_LEXT2) + c->ases |= MIPS_ASE_LOONGSON_EXT2; + + if (cfg2 & LOONGSON_CFG2_LSPW) + c->options |= MIPS_CPU_LDPTE; + + if (cfg3 & LOONGSON_CFG3_LCAMP) + c->ases |= MIPS_ASE_LOONGSON_CAM; +} + static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) { + decode_configs(c); + switch (c->processor_id & PRID_IMP_MASK) { - case PRID_IMP_LOONGSON_64C: /* Loongson-2/3 */ + case PRID_IMP_LOONGSON_64R: /* Loongson-64 Reduced */ + switch (c->processor_id & PRID_REV_MASK) { + case PRID_REV_LOONGSON2K_R1_0: + case PRID_REV_LOONGSON2K_R1_1: + case PRID_REV_LOONGSON2K_R1_2: + case PRID_REV_LOONGSON2K_R1_3: + c->cputype = CPU_LOONGSON64; + __cpu_name[cpu] = "Loongson-2K"; + set_elf_platform(cpu, "gs264e"); + set_isa(c, MIPS_CPU_ISA_M64R2); + break; + } + c->writecombine = _CACHE_UNCACHED_ACCELERATED; + c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_EXT | + MIPS_ASE_LOONGSON_EXT2); + break; + case PRID_IMP_LOONGSON_64C: /* Loongson-3 Classic */ switch (c->processor_id & PRID_REV_MASK) { case PRID_REV_LOONGSON3A_R2_0: case PRID_REV_LOONGSON3A_R2_1: @@ -1952,8 +2062,14 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) set_isa(c, MIPS_CPU_ISA_M64R2); break; } - - decode_configs(c); + /* + * Loongson-3 Classic did not implement MIPS standard TLBINV + * but implemented TLBINVF and EHINV. As currently we're only + * using these two features, enable MIPS_CPU_TLBINV as well. + * + * Also some early Loongson-3A2000 had wrong TLB type in Config + * register, we correct it here. + */ c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE; c->writecombine = _CACHE_UNCACHED_ACCELERATED; c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | @@ -1964,17 +2080,17 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) __cpu_name[cpu] = "ICT Loongson-3"; set_elf_platform(cpu, "loongson3a"); set_isa(c, MIPS_CPU_ISA_M64R2); - decode_configs(c); - c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE; + decode_cpucfg(c); c->writecombine = _CACHE_UNCACHED_ACCELERATED; - c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | - MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2); break; default: panic("Unknown Loongson Processor ID!"); break; } } +#else +static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) { } +#endif static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) { @@ -2028,7 +2144,7 @@ static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) default: break; } - /* fall-through */ + fallthrough; case PRID_IMP_XBURST_REV2: c->cputype = CPU_XBURST; c->writecombine = _CACHE_UNCACHED_ACCELERATED; @@ -2286,6 +2402,13 @@ void cpu_probe(void) cpu_probe_vmbits(c); + /* Synthesize CPUCFG data if running on Loongson processors; + * no-op otherwise. + * + * This looks at previously probed features, so keep this at bottom. + */ + loongson3_cpucfg_synthesize_data(c); + #ifdef CONFIG_64BIT if (cpu == 0) __ua_limit = ~((1ull << cpu_vmbits) - 1); |