MIPS: Netlogic: Get coremask from FUSE register

Use the FUSE register to get the list of active cores in the CPU
instead of using the CPU reset register, this is the recommended
method.

Also add code to mask the coremask with the default number of cores
for each processor series.
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6275/

arch/mips/netlogic/xlp/wakeup.c

@@ -99,7 +99,7 @@ static void xlp_enable_secondary_cores(const cpumask_t *wakeup_mask)
 {
 	struct nlm_soc_info *nodep;
 	uint64_t syspcibase;
-	uint32_t syscoremask;
+	uint32_t syscoremask, mask, fusemask;
 	int core, n, cpu;
 
 	for (n = 0; n < NLM_NR_NODES; n++) {
@@ -111,12 +111,31 @@ static void xlp_enable_secondary_cores(const cpumask_t *wakeup_mask)
 		if (n != 0)
 			nlm_node_init(n);
 		nodep = nlm_get_node(n);
-		syscoremask = nlm_read_sys_reg(nodep->sysbase, SYS_CPU_RESET);
+
+		fusemask = nlm_read_sys_reg(nodep->sysbase,
+					SYS_EFUSE_DEVICE_CFG_STATUS0);
+		switch (read_c0_prid() & 0xff00) {
+		case PRID_IMP_NETLOGIC_XLP3XX:
+			mask = 0xf;
+			break;
+		case PRID_IMP_NETLOGIC_XLP2XX:
+			mask = 0x3;
+			break;
+		case PRID_IMP_NETLOGIC_XLP8XX:
+		default:
+			mask = 0xff;
+			break;
+		}
+
+		/*
+		 * Fused out cores are set in the fusemask, and the remaining
+		 * cores are renumbered to range 0 .. nactive-1
+		 */
+		syscoremask = (1 << hweight32(~fusemask & mask)) - 1;
+
 		/* The boot cpu */
-		if (n == 0) {
-			syscoremask |= 1;
+		if (n == 0)
 			nodep->coremask = 1;
-		}
 
 		for (core = 0; core < NLM_CORES_PER_NODE; core++) {
 			/* we will be on node 0 core 0 */