Basic Loongson-3 CPU support include CPU probing and TLB/cache
initializing.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Signed-off-by: Hongliang Tao <taohl@xxxxxxxxxx>
Signed-off-by: Hua Yan <yanh@xxxxxxxxxx>
Tested-by: Alex Smith <alex.smith@xxxxxxxxxx>
Reviewed-by: Alex Smith <alex.smith@xxxxxxxxxx>
---
arch/mips/include/asm/cpu-type.h | 4 ++
arch/mips/kernel/cpu-probe.c | 12 ++++++--
arch/mips/mm/c-r4k.c | 59 ++++++++++++++++++++++++++++++++++++++
arch/mips/mm/tlb-r4k.c | 5 ++-
arch/mips/mm/tlbex.c | 1 +
5 files changed, 76 insertions(+), 5 deletions(-)
diff --git a/arch/mips/include/asm/cpu-type.h b/arch/mips/include/asm/cpu-type.h
index 02f591b..3def778 100644
--- a/arch/mips/include/asm/cpu-type.h
+++ b/arch/mips/include/asm/cpu-type.h
@@ -20,6 +20,10 @@ static inline int __pure __get_cpu_type(const int cpu_type)
case CPU_LOONGSON2:
#endif
+#ifdef CONFIG_SYS_HAS_CPU_LOONGSON3
+ case CPU_LOONGSON3:
+#endif
+
#ifdef CONFIG_SYS_HAS_CPU_LOONGSON1B
case CPU_LOONGSON1:
#endif
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index ad776a1..16b694b 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -711,16 +711,22 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
c->tlbsize = 64;
break;
case PRID_IMP_LOONGSON_64: /* Loongson-2/3 */
- c->cputype = CPU_LOONGSON2;
- __cpu_name[cpu] = "ICT Loongson-2";
-
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);
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 8f1d549..7aa9c22 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -355,6 +355,7 @@ static inline void local_r4k___flush_cache_all(void * args)
{
switch (current_cpu_type()) {
case CPU_LOONGSON2:
+ case CPU_LOONGSON3:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400SC:
@@ -1010,6 +1011,33 @@ static void probe_pcache(void)
c->dcache.waybit = 0;
break;
+ case CPU_LOONGSON3:
+ config1 = read_c0_config1();
+ lsize = (config1 >> 19) & 7;
+ if (lsize)
+ c->icache.linesz = 2 << lsize;
+ else
+ c->icache.linesz = 0;
+ c->icache.sets = 64 << ((config1 >> 22) & 7);
+ c->icache.ways = 1 + ((config1 >> 16) & 7);
+ icache_size = c->icache.sets *
+ c->icache.ways *
+ c->icache.linesz;
+ c->icache.waybit = 0;
+
+ lsize = (config1 >> 10) & 7;
+ if (lsize)
+ c->dcache.linesz = 2 << lsize;
+ else
+ c->dcache.linesz = 0;
+ c->dcache.sets = 64 << ((config1 >> 13) & 7);
+ c->dcache.ways = 1 + ((config1 >> 7) & 7);
+ dcache_size = c->dcache.sets *
+ c->dcache.ways *
+ c->dcache.linesz;
+ c->dcache.waybit = 0;
+ break;
+
default:
if (!(config & MIPS_CONF_M))
panic("Don't know how to probe P-caches on this cpu.");
@@ -1244,6 +1272,33 @@ static void __init loongson2_sc_init(void)
c->options |= MIPS_CPU_INCLUSIVE_CACHES;
}
+static void __init loongson3_sc_init(void)
+{
+ struct cpuinfo_mips *c = ¤t_cpu_data;
+ unsigned int config2, lsize;
+
+ config2 = read_c0_config2();
+ lsize = (config2 >> 4) & 15;
+ if (lsize)
+ c->scache.linesz = 2 << lsize;
+ else
+ c->scache.linesz = 0;
+ c->scache.sets = 64 << ((config2 >> 8) & 15);
+ c->scache.ways = 1 + (config2 & 15);
+
+ scache_size = c->scache.sets *
+ c->scache.ways *
+ c->scache.linesz;
+ /* Loongson-3 has 4 cores, 1MB scache for each. scaches are shared */
+ scache_size *= 4;
+ c->scache.waybit = 0;
+ pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
+ scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
+ if (scache_size)
+ c->options |= MIPS_CPU_INCLUSIVE_CACHES;
+ return;
+}
+
extern int r5k_sc_init(void);
extern int rm7k_sc_init(void);
extern int mips_sc_init(void);
@@ -1296,6 +1351,10 @@ static void setup_scache(void)
loongson2_sc_init();
return;
+ case CPU_LOONGSON3:
+ loongson3_sc_init();
+ return;
+
case CPU_XLP:
/* don't need to worry about L2, fully coherent */
return;
diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index ae4ca24..eeaf50f 100644
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -48,13 +48,14 @@ extern void build_tlb_refill_handler(void);
#endif /* CONFIG_MIPS_MT_SMTC */
/*
- * LOONGSON2 has a 4 entry itlb which is a subset of dtlb,
- * unfortrunately, itlb is not totally transparent to software.
+ * LOONGSON2/3 has a 4 entry itlb which is a subset of dtlb,
+ * unfortunately, itlb is not totally transparent to software.
*/
static inline void flush_itlb(void)
{
switch (current_cpu_type()) {
case CPU_LOONGSON2:
+ case CPU_LOONGSON3:
write_c0_diag(4);
break;
default:
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index b234b1b..9f8a19c 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -579,6 +579,7 @@ static void build_tlb_write_entry(u32 **p, struct uasm_label **l,
case CPU_BMIPS4380:
case CPU_BMIPS5000:
case CPU_LOONGSON2:
+ case CPU_LOONGSON3:
case CPU_R5500:
if (m4kc_tlbp_war())
uasm_i_nop(p);
--
1.7.7.3
