MIPS: BCM63xx: Enable second core SMP on BCM6328 if available

BCM6328 has a OTP which tells us if the second core is available.
Signed-off-by: NJonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: John Crispin <blogic@openwrt.org>
Cc: Maxime Bizon <mbizon@freebox.fr>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/5490/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/bcm63xx/prom.c

@@ -69,7 +69,11 @@ void __init prom_init(void)
 		 * for now.
 		 */
 		if (BCMCPU_IS_6328()) {
-			bmips_smp_enabled = 0;
+			reg = bcm_readl(BCM_6328_OTP_BASE +
+					OTP_USER_BITS_6328_REG(3));
+
+			if (reg & OTP_6328_REG3_TP1_DISABLED)
+				bmips_smp_enabled = 0;
 		} else if (BCMCPU_IS_6358()) {
 			bmips_smp_enabled = 0;
 		}

arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h

@@ -296,6 +296,8 @@ enum bcm63xx_regs_set {
 #define BCM_6328_PCMDMAS_BASE		(0xdeadbeef)
 #define BCM_6328_RNG_BASE		(0xdeadbeef)
 #define BCM_6328_MISC_BASE		(0xb0001800)
+#define BCM_6328_OTP_BASE		(0xb0000600)
+
 /*
  * 6338 register sets base address
  */

arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h

@@ -1477,4 +1477,11 @@
 
 #define PCIE_DEVICE_OFFSET		0x8000
 
+/*************************************************************************
+ * _REG relative to RSET_OTP
+ *************************************************************************/
+
+#define OTP_USER_BITS_6328_REG(i)	(0x20 + (i) * 4)
+#define   OTP_6328_REG3_TP1_DISABLED	BIT(9)
+
 #endif /* BCM63XX_REGS_H_ */