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Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
-rw-r--r--arch/mips/kernel/cpu-probe.c71
1 files changed, 58 insertions, 13 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 7ddf07f255f3..1e49e05ac8b1 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -9,6 +9,7 @@
*/
#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/mmu_context.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/stddef.h>
@@ -37,6 +38,8 @@
unsigned int elf_hwcap __read_mostly;
EXPORT_SYMBOL_GPL(elf_hwcap);
+static bool mmid_disabled_quirk;
+
static inline unsigned long cpu_get_msa_id(void)
{
unsigned long status, msa_id;
@@ -179,7 +182,6 @@ void __init check_bugs32(void)
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();
@@ -646,7 +648,7 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
if (cpu_has_mips_r6) {
- if (!__builtin_constant_p(cpu_has_mmid) || cpu_has_mmid)
+ if (!mmid_disabled_quirk && (!__builtin_constant_p(cpu_has_mmid) || cpu_has_mmid))
config5 |= MIPS_CONF5_MI;
else
config5 &= ~MIPS_CONF5_MI;
@@ -709,7 +711,6 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
max_mmid_width);
asid_mask = GENMASK(max_mmid_width - 1, 0);
}
-
set_cpu_asid_mask(c, asid_mask);
}
}
@@ -1139,7 +1140,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
* 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.
+ * its c0_prid id number with the TX3900.
*/
c->cputype = CPU_R4650;
__cpu_name[cpu] = "R4650";
@@ -1287,14 +1288,14 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
set_cpu_asid_mask(c, MIPS_ENTRYHI_ASID);
c->writecombine = _CACHE_UNCACHED_ACCELERATED;
break;
- case PRID_IMP_LOONGSON_32: /* Loongson-1 */
+ case PRID_IMP_LOONGSON_32:
decode_configs(c);
c->cputype = CPU_LOONGSON32;
switch (c->processor_id & PRID_REV_MASK) {
- case PRID_REV_LOONGSON1B:
- __cpu_name[cpu] = "Loongson 1B";
+ case PRID_REV_LOONGSON1:
+ __cpu_name[cpu] = "ICT Loongson-1";
break;
}
@@ -1502,6 +1503,10 @@ static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
break;
}
break;
+ case PRID_IMP_NETLOGIC_AU13XX:
+ c->cputype = CPU_ALCHEMY;
+ __cpu_name[cpu] = "Au1300";
+ break;
}
}
@@ -1602,6 +1607,8 @@ static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
+ /* Octeon has different cache interface */
+ c->options &= ~MIPS_CPU_4K_CACHE;
switch (c->processor_id & PRID_IMP_MASK) {
case PRID_IMP_CAVIUM_CN38XX:
case PRID_IMP_CAVIUM_CN31XX:
@@ -1671,7 +1678,10 @@ static inline void decode_cpucfg(struct cpuinfo_mips *c)
static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
{
+ c->cputype = CPU_LOONGSON64;
+
/* All Loongson processors covered here define ExcCode 16 as GSExc. */
+ decode_configs(c);
c->options |= MIPS_CPU_GSEXCEX;
switch (c->processor_id & PRID_IMP_MASK) {
@@ -1681,7 +1691,6 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
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);
@@ -1694,14 +1703,12 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
switch (c->processor_id & PRID_REV_MASK) {
case PRID_REV_LOONGSON3A_R2_0:
case PRID_REV_LOONGSON3A_R2_1:
- c->cputype = CPU_LOONGSON64;
__cpu_name[cpu] = "ICT Loongson-3";
set_elf_platform(cpu, "loongson3a");
set_isa(c, MIPS_CPU_ISA_M64R2);
break;
case PRID_REV_LOONGSON3A_R3_0:
case PRID_REV_LOONGSON3A_R3_1:
- c->cputype = CPU_LOONGSON64;
__cpu_name[cpu] = "ICT Loongson-3";
set_elf_platform(cpu, "loongson3a");
set_isa(c, MIPS_CPU_ISA_M64R2);
@@ -1719,20 +1726,21 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);
c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */
+ change_c0_config6(LOONGSON_CONF6_EXTIMER | LOONGSON_CONF6_INTIMER,
+ LOONGSON_CONF6_INTIMER);
break;
case PRID_IMP_LOONGSON_64G:
- c->cputype = CPU_LOONGSON64;
__cpu_name[cpu] = "ICT Loongson-3";
set_elf_platform(cpu, "loongson3a");
set_isa(c, MIPS_CPU_ISA_M64R2);
decode_cpucfg(c);
+ change_c0_config6(LOONGSON_CONF6_EXTIMER | LOONGSON_CONF6_INTIMER,
+ LOONGSON_CONF6_INTIMER);
break;
default:
panic("Unknown Loongson Processor ID!");
break;
}
-
- decode_configs(c);
}
#else
static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) { }
@@ -1861,6 +1869,7 @@ void cpu_probe(void)
cpu_probe_mips(c, cpu);
break;
case PRID_COMP_ALCHEMY:
+ case PRID_COMP_NETLOGIC:
cpu_probe_alchemy(c, cpu);
break;
case PRID_COMP_SIBYTE:
@@ -2039,3 +2048,39 @@ void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe)
cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_VP;
cpuinfo->globalnumber |= vpe << MIPS_GLOBALNUMBER_VP_SHF;
}
+
+void cpu_disable_mmid(void)
+{
+ int i;
+ unsigned long asid_mask;
+ unsigned int cpu = smp_processor_id();
+ struct cpuinfo_mips *c = &current_cpu_data;
+ unsigned int config4 = read_c0_config4();
+ unsigned int config5 = read_c0_config5();
+
+ /* Setup the initial ASID mask based on config4 */
+ asid_mask = MIPS_ENTRYHI_ASID;
+ if (config4 & MIPS_CONF4_AE)
+ asid_mask |= MIPS_ENTRYHI_ASIDX;
+ set_cpu_asid_mask(c, asid_mask);
+
+ /* Disable MMID in the C0 and update cpuinfo_mips accordingly */
+ config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
+ config5 &= ~MIPS_CONF5_MI;
+ write_c0_config5(config5);
+ /* Ensure the write to config5 above takes effect */
+ back_to_back_c0_hazard();
+ c->options &= ~MIPS_CPU_MMID;
+
+ /* Setup asid cache value cleared in per_cpu_trap_init() */
+ cpu_data[cpu].asid_cache = asid_first_version(cpu);
+
+ /* Reinit context for each CPU */
+ for_each_possible_cpu(i)
+ set_cpu_context(i, &init_mm, 0);
+
+ /* Ensure that now MMID will be seen as disable */
+ mmid_disabled_quirk = true;
+
+ pr_info("MMID support disabled due to hardware support issue\n");
+}
generated by cgit (git 2.34.1) at 2025-12-25 05:53:41 +0000