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Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
-rw-r--r--arch/mips/kernel/cpu-probe.c220
1 files changed, 183 insertions, 37 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 5465dc183e5..d74f957c561 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -23,6 +23,8 @@
#include <asm/cpu-type.h>
#include <asm/fpu.h>
#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
+#include <asm/msa.h>
#include <asm/watch.h>
#include <asm/elf.h>
#include <asm/spram.h>
@@ -60,7 +62,7 @@ static inline void check_errata(void)
case CPU_34K:
/*
* Erratum "RPS May Cause Incorrect Instruction Execution"
- * This code only handles VPE0, any SMP/SMTC/RTOS code
+ * This code only handles VPE0, any SMP/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)
@@ -112,7 +114,7 @@ static inline unsigned long cpu_get_fpu_id(void)
unsigned long tmp, fpu_id;
tmp = read_c0_status();
- __enable_fpu();
+ __enable_fpu(FPU_AS_IS);
fpu_id = read_32bit_cp1_register(CP1_REVISION);
write_c0_status(tmp);
return fpu_id;
@@ -126,6 +128,20 @@ 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, conf5, 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);
+ write_c0_status(status);
+ return msa_id;
+}
+
static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
{
#ifdef __NEED_VMBITS_PROBE
@@ -163,6 +179,27 @@ static void set_isa(struct cpuinfo_mips *c, unsigned int isa)
static char unknown_isa[] = KERN_ERR \
"Unsupported ISA type, c0.config0: %d.";
+static void set_ftlb_enable(struct cpuinfo_mips *c, int enable)
+{
+ unsigned int config6;
+
+ /* It's implementation dependent how the FTLB can be enabled */
+ switch (c->cputype) {
+ case CPU_PROAPTIV:
+ case CPU_P5600:
+ /* proAptiv & related cores use Config6 to enable the FTLB */
+ config6 = read_c0_config6();
+ if (enable)
+ /* Enable FTLB */
+ write_c0_config6(config6 | MIPS_CONF6_FTLBEN);
+ else
+ /* Disable FTLB */
+ write_c0_config6(config6 & ~MIPS_CONF6_FTLBEN);
+ back_to_back_c0_hazard();
+ break;
+ }
+}
+
static inline unsigned int decode_config0(struct cpuinfo_mips *c)
{
unsigned int config0;
@@ -170,8 +207,13 @@ static inline unsigned int decode_config0(struct cpuinfo_mips *c)
config0 = read_c0_config();
- if (((config0 & MIPS_CONF_MT) >> 7) == 1)
+ /*
+ * Look for Standard TLB or Dual VTLB and FTLB
+ */
+ if ((((config0 & MIPS_CONF_MT) >> 7) == 1) ||
+ (((config0 & MIPS_CONF_MT) >> 7) == 4))
c->options |= MIPS_CPU_TLB;
+
isa = (config0 & MIPS_CONF_AT) >> 13;
switch (isa) {
case 0:
@@ -226,8 +268,11 @@ static inline unsigned int decode_config1(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_FPU;
c->options |= MIPS_CPU_32FPR;
}
- if (cpu_has_tlb)
+ if (cpu_has_tlb) {
c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
+ c->tlbsizevtlb = c->tlbsize;
+ c->tlbsizeftlbsets = 0;
+ }
return config1 & MIPS_CONF_M;
}
@@ -272,6 +317,10 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_MICROMIPS;
if (config3 & MIPS_CONF3_VZ)
c->ases |= MIPS_ASE_VZ;
+ if (config3 & MIPS_CONF3_SC)
+ c->options |= MIPS_CPU_SEGMENTS;
+ if (config3 & MIPS_CONF3_MSA)
+ c->ases |= MIPS_ASE_MSA;
return config3 & MIPS_CONF_M;
}
@@ -279,12 +328,51 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
static inline unsigned int decode_config4(struct cpuinfo_mips *c)
{
unsigned int config4;
+ unsigned int newcf4;
+ unsigned int mmuextdef;
+ unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
config4 = read_c0_config4();
- if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT
- && cpu_has_tlb)
- c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
+ if (cpu_has_tlb) {
+ if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
+ c->options |= MIPS_CPU_TLBINV;
+ mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
+ switch (mmuextdef) {
+ case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
+ c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
+ c->tlbsizevtlb = c->tlbsize;
+ break;
+ case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
+ c->tlbsizevtlb +=
+ ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
+ MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
+ c->tlbsize = c->tlbsizevtlb;
+ ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
+ /* fall through */
+ case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
+ newcf4 = (config4 & ~ftlb_page) |
+ (page_size_ftlb(mmuextdef) <<
+ MIPS_CONF4_FTLBPAGESIZE_SHIFT);
+ write_c0_config4(newcf4);
+ back_to_back_c0_hazard();
+ config4 = read_c0_config4();
+ if (config4 != newcf4) {
+ pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
+ PAGE_SIZE, config4);
+ /* Switch FTLB off */
+ set_ftlb_enable(c, 0);
+ break;
+ }
+ c->tlbsizeftlbsets = 1 <<
+ ((config4 & MIPS_CONF4_FTLBSETS) >>
+ MIPS_CONF4_FTLBSETS_SHIFT);
+ c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
+ MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
+ c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
+ break;
+ }
+ }
c->kscratch_mask = (config4 >> 16) & 0xff;
@@ -299,6 +387,9 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
config5 &= ~MIPS_CONF5_UFR;
write_c0_config5(config5);
+ if (config5 & MIPS_CONF5_EVA)
+ c->options |= MIPS_CPU_EVA;
+
return config5 & MIPS_CONF_M;
}
@@ -312,6 +403,9 @@ static void decode_configs(struct cpuinfo_mips *c)
c->scache.flags = MIPS_CACHE_NOT_PRESENT;
+ /* Enable FTLB if present */
+ set_ftlb_enable(c, 1);
+
ok = decode_config0(c); /* Read Config registers. */
BUG_ON(!ok); /* Arch spec violation! */
if (ok)
@@ -327,8 +421,13 @@ static void decode_configs(struct cpuinfo_mips *c)
mips_probe_watch_registers(c);
- if (cpu_has_mips_r2)
- c->core = read_c0_ebase() & 0x3ff;
+#ifndef CONFIG_MIPS_CPS
+ if (cpu_has_mips_r2) {
+ c->core = get_ebase_cpunum();
+ if (cpu_has_mipsmt)
+ c->core >>= fls(core_nvpes()) - 1;
+ }
+#endif
}
#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
@@ -376,13 +475,33 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
__cpu_name[cpu] = "R4000PC";
}
} else {
+ int cca = read_c0_config() & CONF_CM_CMASK;
+ int mc;
+
+ /*
+ * SC and MC versions can't be reliably told apart,
+ * but only the latter support coherent caching
+ * modes so assume the firmware has set the KSEG0
+ * coherency attribute reasonably (if uncached, we
+ * assume SC).
+ */
+ switch (cca) {
+ case CONF_CM_CACHABLE_CE:
+ case CONF_CM_CACHABLE_COW:
+ case CONF_CM_CACHABLE_CUW:
+ mc = 1;
+ break;
+ default:
+ mc = 0;
+ break;
+ }
if ((c->processor_id & PRID_REV_MASK) >=
PRID_REV_R4400) {
- c->cputype = CPU_R4400SC;
- __cpu_name[cpu] = "R4400SC";
+ c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
+ __cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
} else {
- c->cputype = CPU_R4000SC;
- __cpu_name[cpu] = "R4000SC";
+ c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
+ __cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
}
}
@@ -565,21 +684,6 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
*/
c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
break;
- case PRID_IMP_RM9000:
- c->cputype = CPU_RM9000;
- __cpu_name[cpu] = "RM9000";
- set_isa(c, 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";
@@ -619,17 +723,23 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
MIPS_CPU_LLSC;
c->tlbsize = 64;
break;
- case PRID_IMP_LOONGSON2:
- c->cputype = CPU_LOONGSON2;
- __cpu_name[cpu] = "ICT Loongson-2";
-
+ case PRID_IMP_LOONGSON_64: /* Loongson-2/3 */
switch (c->processor_id & PRID_REV_MASK) {
case PRID_REV_LOONGSON2E:
+ c->cputype = CPU_LOONGSON2;
+ __cpu_name[cpu] = "ICT Loongson-2";
set_elf_platform(cpu, "loongson2e");
break;
case PRID_REV_LOONGSON2F:
+ c->cputype = CPU_LOONGSON2;
+ __cpu_name[cpu] = "ICT Loongson-2";
set_elf_platform(cpu, "loongson2f");
break;
+ case PRID_REV_LOONGSON3A:
+ c->cputype = CPU_LOONGSON3;
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3a");
+ break;
}
set_isa(c, MIPS_CPU_ISA_III);
@@ -638,7 +748,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
MIPS_CPU_32FPR;
c->tlbsize = 64;
break;
- case PRID_IMP_LOONGSON1:
+ case PRID_IMP_LOONGSON_32: /* Loongson-1 */
decode_configs(c);
c->cputype = CPU_LOONGSON1;
@@ -655,7 +765,6 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
{
- decode_configs(c);
switch (c->processor_id & PRID_IMP_MASK) {
case PRID_IMP_4KC:
c->cputype = CPU_4KC;
@@ -716,11 +825,37 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
__cpu_name[cpu] = "MIPS 1004Kc";
break;
case PRID_IMP_1074K:
- c->cputype = CPU_74K;
+ c->cputype = CPU_1074K;
__cpu_name[cpu] = "MIPS 1074Kc";
break;
+ case PRID_IMP_INTERAPTIV_UP:
+ c->cputype = CPU_INTERAPTIV;
+ __cpu_name[cpu] = "MIPS interAptiv";
+ break;
+ case PRID_IMP_INTERAPTIV_MP:
+ c->cputype = CPU_INTERAPTIV;
+ __cpu_name[cpu] = "MIPS interAptiv (multi)";
+ break;
+ case PRID_IMP_PROAPTIV_UP:
+ c->cputype = CPU_PROAPTIV;
+ __cpu_name[cpu] = "MIPS proAptiv";
+ break;
+ case PRID_IMP_PROAPTIV_MP:
+ c->cputype = CPU_PROAPTIV;
+ __cpu_name[cpu] = "MIPS proAptiv (multi)";
+ break;
+ case PRID_IMP_P5600:
+ c->cputype = CPU_P5600;
+ __cpu_name[cpu] = "MIPS P5600";
+ break;
+ case PRID_IMP_M5150:
+ c->cputype = CPU_M5150;
+ __cpu_name[cpu] = "MIPS M5150";
+ break;
}
+ decode_configs(c);
+
spram_config();
}
@@ -891,6 +1026,7 @@ 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;
+ BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
switch (c->processor_id & PRID_IMP_MASK) {
case PRID_IMP_JZRISC:
c->cputype = CPU_JZRISC;
@@ -923,6 +1059,8 @@ static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
switch (c->processor_id & PRID_IMP_MASK) {
case PRID_IMP_NETLOGIC_XLP2XX:
+ case PRID_IMP_NETLOGIC_XLP9XX:
+ case PRID_IMP_NETLOGIC_XLP5XX:
c->cputype = CPU_XLP;
__cpu_name[cpu] = "Broadcom XLPII";
break;
@@ -1067,6 +1205,12 @@ void cpu_probe(void)
else
c->srsets = 1;
+ if (cpu_has_msa) {
+ c->msa_id = cpu_get_msa_id();
+ WARN(c->msa_id & MSA_IR_WRPF,
+ "Vector register partitioning unimplemented!");
+ }
+
cpu_probe_vmbits(c);
#ifdef CONFIG_64BIT
@@ -1079,8 +1223,10 @@ 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());
+ pr_info("CPU%d revision is: %08x (%s)\n",
+ smp_processor_id(), c->processor_id, cpu_name_string());
if (c->options & MIPS_CPU_FPU)
printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
+ if (cpu_has_msa)
+ pr_info("MSA revision is: %08x\n", c->msa_id);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 02:03:07 +0000