MIPS: Add Cavium OCTEON processor constants and CPU probe.

Add OCTEON constants to asm/cpu.h and asm/module.h.

Add probe function for Cavium OCTEON CPUs and hook it up.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/cpu.h

@@ -33,6 +33,7 @@
 #define PRID_COMP_TOSHIBA	0x070000
 #define PRID_COMP_LSI		0x080000
 #define PRID_COMP_LEXRA		0x0b0000
+#define PRID_COMP_CAVIUM	0x0d0000
 
 
 /*
@@ -113,6 +114,18 @@
 #define PRID_IMP_BCM4710	0x4000
 #define PRID_IMP_BCM3302	0x9000
 
+/*
+ * These are the PRID's for when 23:16 == PRID_COMP_CAVIUM
+ */
+
+#define PRID_IMP_CAVIUM_CN38XX 0x0000
+#define PRID_IMP_CAVIUM_CN31XX 0x0100
+#define PRID_IMP_CAVIUM_CN30XX 0x0200
+#define PRID_IMP_CAVIUM_CN58XX 0x0300
+#define PRID_IMP_CAVIUM_CN56XX 0x0400
+#define PRID_IMP_CAVIUM_CN50XX 0x0600
+#define PRID_IMP_CAVIUM_CN52XX 0x0700
+
 /*
  * Definitions for 7:0 on legacy processors
  */
@@ -203,6 +216,7 @@ enum cpu_type_enum {
 	 * MIPS64 class processors
 	 */
 	CPU_5KC, CPU_20KC, CPU_25KF, CPU_SB1, CPU_SB1A, CPU_LOONGSON2,
+	CPU_CAVIUM_OCTEON,
 
 	CPU_LAST
 };

arch/mips/include/asm/module.h

@@ -116,6 +116,8 @@ search_module_dbetables(unsigned long addr)
 #define MODULE_PROC_FAMILY "SB1 "
 #elif defined CONFIG_CPU_LOONGSON2
 #define MODULE_PROC_FAMILY "LOONGSON2 "
+#elif defined CONFIG_CPU_CAVIUM_OCTEON
+#define MODULE_PROC_FAMILY "OCTEON "
 #else
 #error MODULE_PROC_FAMILY undefined for your processor configuration
 #endif

arch/mips/kernel/cpu-probe.c

@@ -154,6 +154,7 @@ void __init check_wait(void)
 	case CPU_25KF:
 	case CPU_PR4450:
 	case CPU_BCM3302:
+	case CPU_CAVIUM_OCTEON:
 		cpu_wait = r4k_wait;
 		break;
 
@@ -875,6 +876,27 @@ 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);
+	switch (c->processor_id & 0xff00) {
+	case PRID_IMP_CAVIUM_CN38XX:
+	case PRID_IMP_CAVIUM_CN31XX:
+	case PRID_IMP_CAVIUM_CN30XX:
+	case PRID_IMP_CAVIUM_CN58XX:
+	case PRID_IMP_CAVIUM_CN56XX:
+	case PRID_IMP_CAVIUM_CN50XX:
+	case PRID_IMP_CAVIUM_CN52XX:
+		c->cputype = CPU_CAVIUM_OCTEON;
+		__cpu_name[cpu] = "Cavium Octeon";
+		break;
+	default:
+		printk(KERN_INFO "Unknown Octeon chip!\n");
+		c->cputype = CPU_UNKNOWN;
+		break;
+	}
+}
+
 const char *__cpu_name[NR_CPUS];
 
 __cpuinit void cpu_probe(void)
@@ -909,6 +931,9 @@ __cpuinit void cpu_probe(void)
 	case PRID_COMP_NXP:
 		cpu_probe_nxp(c, cpu);
 		break;
+	case PRID_COMP_CAVIUM:
+		cpu_probe_cavium(c, cpu);
+		break;
 	}
 
 	BUG_ON(!__cpu_name[cpu]);