Revert "MIPS: Remove unused R4300 CPU support"

This reverts commit f9065b54.

We're adding Nintendo 64 support, so the VR4300 is no longer unused.
Signed-off-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -1660,6 +1660,15 @@ config CPU_VR41XX
 	  kernel built with this option will not run on any other type of
 	  processor or vice versa.
 
+config CPU_R4300
+	bool "R4300"
+	depends on SYS_HAS_CPU_R4300
+	select CPU_SUPPORTS_32BIT_KERNEL
+	select CPU_SUPPORTS_64BIT_KERNEL
+	select CPU_HAS_LOAD_STORE_LR
+	help
+	  MIPS Technologies R4300-series processors.
+
 config CPU_R4X00
 	bool "R4x00"
 	depends on SYS_HAS_CPU_R4X00
@@ -1994,6 +2003,9 @@ config SYS_HAS_CPU_TX39XX
 config SYS_HAS_CPU_VR41XX
 	bool
 
+config SYS_HAS_CPU_R4300
+	bool
+
 config SYS_HAS_CPU_R4X00
 	bool
 

arch/mips/Makefile

@@ -160,6 +160,7 @@ cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
 #
 cflags-$(CONFIG_CPU_R3000)	+= -march=r3000
 cflags-$(CONFIG_CPU_TX39XX)	+= -march=r3900
+cflags-$(CONFIG_CPU_R4300)	+= -march=r4300 -Wa,--trap
 cflags-$(CONFIG_CPU_VR41XX)	+= -march=r4100 -Wa,--trap
 cflags-$(CONFIG_CPU_R4X00)	+= -march=r4600 -Wa,--trap
 cflags-$(CONFIG_CPU_TX49XX)	+= -march=r4600 -Wa,--trap

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

@@ -122,6 +122,11 @@ static inline int __pure __get_cpu_type(const int cpu_type)
 	case CPU_VR4181A:
 #endif
 
+#ifdef CONFIG_SYS_HAS_CPU_R4300
+	case CPU_R4300:
+	case CPU_R4310:
+#endif
+
 #ifdef CONFIG_SYS_HAS_CPU_R4X00
 	case CPU_R4000PC:
 	case CPU_R4000SC:

arch/mips/include/asm/cpu.h

@@ -302,7 +302,7 @@ enum cpu_type_enum {
 	/*
 	 * R4000 class processors
 	 */
-	CPU_R4000PC, CPU_R4000SC, CPU_R4000MC, CPU_R4200,
+	CPU_R4000PC, CPU_R4000SC, CPU_R4000MC, CPU_R4200, CPU_R4300, CPU_R4310,
 	CPU_R4400PC, CPU_R4400SC, CPU_R4400MC, CPU_R4600, CPU_R4640, CPU_R4650,
 	CPU_R4700, CPU_R5000, CPU_R5500, CPU_NEVADA, CPU_R10000,
 	CPU_R12000, CPU_R14000, CPU_R16000, CPU_VR41XX, CPU_VR4111, CPU_VR4121,

arch/mips/include/asm/vermagic.h

@@ -26,6 +26,8 @@
 #define MODULE_PROC_FAMILY "TX39XX "
 #elif defined CONFIG_CPU_VR41XX
 #define MODULE_PROC_FAMILY "VR41XX "
+#elif defined CONFIG_CPU_R4300
+#define MODULE_PROC_FAMILY "R4300 "
 #elif defined CONFIG_CPU_R4X00
 #define MODULE_PROC_FAMILY "R4X00 "
 #elif defined CONFIG_CPU_TX49XX

arch/mips/kernel/cpu-probe.c

@@ -1154,6 +1154,15 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 			break;
 		}
 		break;
+	case PRID_IMP_R4300:
+		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;
+		break;
 	case PRID_IMP_R4600:
 		c->cputype = CPU_R4600;
 		__cpu_name[cpu] = "R4600";

arch/mips/kernel/idle.c

@@ -151,6 +151,7 @@ void __init check_wait(void)
 		cpu_wait = r39xx_wait;
 		break;
 	case CPU_R4200:
+/*	case CPU_R4300: */
 	case CPU_R4600:
 	case CPU_R4640:
 	case CPU_R4650:

arch/mips/mm/c-r4k.c

@@ -1164,6 +1164,7 @@ static void probe_pcache(void)
 	case CPU_R4400PC:
 	case CPU_R4400SC:
 	case CPU_R4400MC:
+	case CPU_R4300:
 		icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
 		c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
 		c->icache.ways = 1;

arch/mips/mm/tlbex.c

@@ -549,6 +549,7 @@ void build_tlb_write_entry(u32 **p, struct uasm_label **l,
 		tlbw(p);
 		break;
 
+	case CPU_R4300:
 	case CPU_5KC:
 	case CPU_TX49XX:
 	case CPU_PR4450: