MIPS: Loongson: Add basic Loongson-3 CPU support

Basic Loongson-3 CPU support include CPU probing and TLB/cache
initializing.

Signed-off-by: Huacai Chen <[e-mail]>
Signed-off-by: Hongliang Tao <[e-mail]>
Signed-off-by: Hua Yan <[e-mail]>
Tested-by: Alex Smith <[e-mail]>
Reviewed-by: Alex Smith <[e-mail]>
Cc: John Crispin <[e-mail]>
Cc: Steven J. Hill <[e-mail]>
Cc: Aurelien Jarno <[e-mail]>
Cc: [e-mail]
Cc: Fuxin Zhang <[e-mail]>
Cc: Zhangjin Wu <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/6630
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/include/asm/cpu-type.h

···
 	case CPU_LOONGSON2:
 #endif
 
+#ifdef CONFIG_SYS_HAS_CPU_LOONGSON3
+	case CPU_LOONGSON3:
+#endif
+
 #ifdef CONFIG_SYS_HAS_CPU_LOONGSON1B
 	case CPU_LOONGSON1:
 #endif

arch/mips/kernel/cpu-probe.c

···
 		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;
 		}
 

arch/mips/mm/c-r4k.c

···
 {
 	switch (current_cpu_type()) {
 	case CPU_LOONGSON2:
+	case CPU_LOONGSON3:
 	case CPU_R4000SC:
 	case CPU_R4000MC:
 	case CPU_R4400SC:
···
 		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.");
···
 	c->options |= MIPS_CPU_INCLUSIVE_CACHES;
 }
 
+static void __init loongson3_sc_init(void)
+{
+	struct cpuinfo_mips *c = &current_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);
···
 
 	case CPU_LOONGSON2:
 		loongson2_sc_init();
+		return;
+
+	case CPU_LOONGSON3:
+		loongson3_sc_init();
 		return;
 
 	case CPU_XLP:

arch/mips/mm/tlb-r4k.c

···
 #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:

arch/mips/mm/tlbex.c

···
 	case CPU_BMIPS4380:
 	case CPU_BMIPS5000:
 	case CPU_LOONGSON2:
+	case CPU_LOONGSON3:
 	case CPU_R5500:
 		if (m4kc_tlbp_war())
 			uasm_i_nop(p);