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Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
-rw-r--r--arch/mips/kernel/cpu-probe.c200
1 files changed, 152 insertions, 48 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 48dfb9de853d..e36515dcd3b2 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -20,6 +20,7 @@
#include <asm/bugs.h>
#include <asm/cpu.h>
+#include <asm/cpu-features.h>
#include <asm/cpu-type.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
@@ -31,11 +32,127 @@
#include <asm/spram.h>
#include <asm/uaccess.h>
+/*
+ * 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_AS_IS);
+ fpu_id = read_32bit_cp1_register(CP1_REVISION);
+ write_c0_status(tmp);
+ return fpu_id;
+}
+
+/*
+ * Check if the CPU has an external FPU.
+ */
+static inline int __cpu_has_fpu(void)
+{
+ return (cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE;
+}
+
+static inline unsigned long cpu_get_msa_id(void)
+{
+ unsigned long status, msa_id;
+
+ status = read_c0_status();
+ __enable_fpu(FPU_64BIT);
+ enable_msa();
+ msa_id = read_msa_ir();
+ disable_msa();
+ write_c0_status(status);
+ return msa_id;
+}
+
+/*
+ * Determine the FCSR mask for FPU hardware.
+ */
+static inline void cpu_set_fpu_fcsr_mask(struct cpuinfo_mips *c)
+{
+ unsigned long sr, mask, fcsr, fcsr0, fcsr1;
+
+ mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
+
+ sr = read_c0_status();
+ __enable_fpu(FPU_AS_IS);
+
+ fcsr = read_32bit_cp1_register(CP1_STATUS);
+
+ fcsr0 = fcsr & mask;
+ write_32bit_cp1_register(CP1_STATUS, fcsr0);
+ fcsr0 = read_32bit_cp1_register(CP1_STATUS);
+
+ fcsr1 = fcsr | ~mask;
+ write_32bit_cp1_register(CP1_STATUS, fcsr1);
+ fcsr1 = read_32bit_cp1_register(CP1_STATUS);
+
+ write_32bit_cp1_register(CP1_STATUS, fcsr);
+
+ write_c0_status(sr);
+
+ c->fpu_msk31 = ~(fcsr0 ^ fcsr1) & ~mask;
+}
+
+/*
+ * Set the FIR feature flags for the FPU emulator.
+ */
+static void cpu_set_nofpu_id(struct cpuinfo_mips *c)
+{
+ u32 value;
+
+ 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_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_M32R6 | MIPS_CPU_ISA_M64R6))
+ value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W;
+ c->fpu_id = value;
+}
+
+/* Determined FPU emulator mask to use for the boot CPU with "nofpu". */
+static unsigned int mips_nofpu_msk31;
+
+/*
+ * Set options for FPU hardware.
+ */
+static void cpu_set_fpu_opts(struct cpuinfo_mips *c)
+{
+ c->fpu_id = cpu_get_fpu_id();
+ mips_nofpu_msk31 = c->fpu_msk31;
+
+ if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
+ MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
+ MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
+ if (c->fpu_id & MIPS_FPIR_3D)
+ c->ases |= MIPS_ASE_MIPS3D;
+ if (c->fpu_id & MIPS_FPIR_FREP)
+ c->options |= MIPS_CPU_FRE;
+ }
+
+ cpu_set_fpu_fcsr_mask(c);
+}
+
+/*
+ * Set options for the FPU emulator.
+ */
+static void cpu_set_nofpu_opts(struct cpuinfo_mips *c)
+{
+ c->options &= ~MIPS_CPU_FPU;
+ c->fpu_msk31 = mips_nofpu_msk31;
+
+ cpu_set_nofpu_id(c);
+}
+
static int mips_fpu_disabled;
static int __init fpu_disable(char *s)
{
- cpu_data[0].options &= ~MIPS_CPU_FPU;
+ cpu_set_nofpu_opts(&boot_cpu_data);
mips_fpu_disabled = 1;
return 1;
@@ -178,41 +295,6 @@ static inline void set_elf_platform(int cpu, const char *plat)
__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_AS_IS);
- 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() & FPIR_IMP_MASK) != FPIR_IMP_NONE;
-}
-
-static inline unsigned long cpu_get_msa_id(void)
-{
- unsigned long status, msa_id;
-
- status = read_c0_status();
- __enable_fpu(FPU_64BIT);
- enable_msa();
- msa_id = read_msa_ir();
- disable_msa();
- write_c0_status(status);
- return msa_id;
-}
-
static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
{
#ifdef __NEED_VMBITS_PROBE
@@ -441,6 +523,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
c->htw_seq = 0;
c->options |= MIPS_CPU_HTW;
}
+ if (config3 & MIPS_CONF3_CDMM)
+ c->options |= MIPS_CPU_CDMM;
return config3 & MIPS_CONF_M;
}
@@ -516,6 +600,10 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_MAAR;
if (config5 & MIPS_CONF5_LLB)
c->options |= MIPS_CPU_RW_LLB;
+#ifdef CONFIG_XPA
+ if (config5 & MIPS_CONF5_MVH)
+ c->options |= MIPS_CPU_XPA;
+#endif
return config5 & MIPS_CONF_M;
}
@@ -575,6 +663,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
case PRID_IMP_R2000:
c->cputype = CPU_R2000;
__cpu_name[cpu] = "R2000";
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
MIPS_CPU_NOFPUEX;
if (__cpu_has_fpu())
@@ -594,6 +683,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R3000;
__cpu_name[cpu] = "R3000";
}
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
MIPS_CPU_NOFPUEX;
if (__cpu_has_fpu())
@@ -642,6 +732,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
}
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_WATCH | MIPS_CPU_VCE |
MIPS_CPU_LLSC;
@@ -649,6 +740,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
break;
case PRID_IMP_VR41XX:
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS;
c->tlbsize = 32;
switch (c->processor_id & 0xf0) {
@@ -690,6 +782,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R4300;
__cpu_name[cpu] = "R4300";
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
c->tlbsize = 32;
@@ -698,6 +791,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R4600;
__cpu_name[cpu] = "R4600";
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
c->tlbsize = 48;
@@ -713,11 +807,13 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R4650;
__cpu_name[cpu] = "R4650";
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
c->tlbsize = 48;
break;
#endif
case PRID_IMP_TX39:
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
@@ -743,6 +839,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R4700;
__cpu_name[cpu] = "R4700";
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
c->tlbsize = 48;
@@ -751,6 +848,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_TX49XX;
__cpu_name[cpu] = "R49XX";
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
c->options = R4K_OPTS | MIPS_CPU_LLSC;
if (!(c->processor_id & 0x08))
c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
@@ -792,6 +890,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R6000;
__cpu_name[cpu] = "R6000";
set_isa(c, MIPS_CPU_ISA_II);
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
MIPS_CPU_LLSC;
c->tlbsize = 32;
@@ -800,6 +899,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->cputype = CPU_R6000A;
__cpu_name[cpu] = "R6000A";
set_isa(c, MIPS_CPU_ISA_II);
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
MIPS_CPU_LLSC;
c->tlbsize = 32;
@@ -850,8 +950,13 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->tlbsize = 64;
break;
case PRID_IMP_R14000:
- c->cputype = CPU_R14000;
- __cpu_name[cpu] = "R14000";
+ if (((c->processor_id >> 4) & 0x0f) > 2) {
+ c->cputype = CPU_R16000;
+ __cpu_name[cpu] = "R16000";
+ } else {
+ c->cputype = CPU_R14000;
+ __cpu_name[cpu] = "R14000";
+ }
set_isa(c, MIPS_CPU_ISA_IV);
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
MIPS_CPU_FPU | MIPS_CPU_32FPR |
@@ -866,12 +971,14 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
__cpu_name[cpu] = "ICT Loongson-2";
set_elf_platform(cpu, "loongson2e");
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
break;
case PRID_REV_LOONGSON2F:
c->cputype = CPU_LOONGSON2;
__cpu_name[cpu] = "ICT Loongson-2";
set_elf_platform(cpu, "loongson2f");
set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
break;
case PRID_REV_LOONGSON3A:
c->cputype = CPU_LOONGSON3;
@@ -1308,6 +1415,9 @@ void cpu_probe(void)
c->cputype = CPU_UNKNOWN;
c->writecombine = _CACHE_UNCACHED;
+ c->fpu_csr31 = FPU_CSR_RN;
+ c->fpu_msk31 = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
+
c->processor_id = read_c0_prid();
switch (c->processor_id & PRID_COMP_MASK) {
case PRID_COMP_LEGACY:
@@ -1364,16 +1474,10 @@ void cpu_probe(void)
~(1 << MIPS_PWCTL_PWEN_SHIFT));
}
- if (c->options & MIPS_CPU_FPU) {
- c->fpu_id = cpu_get_fpu_id();
-
- if (c->isa_level & cpu_has_mips_r) {
- if (c->fpu_id & MIPS_FPIR_3D)
- c->ases |= MIPS_ASE_MIPS3D;
- if (c->fpu_id & MIPS_FPIR_FREP)
- c->options |= MIPS_CPU_FRE;
- }
- }
+ if (c->options & MIPS_CPU_FPU)
+ cpu_set_fpu_opts(c);
+ else
+ cpu_set_nofpu_opts(c);
if (cpu_has_mips_r2_r6) {
c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
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