ARM: BCM: Add SMP support for Broadcom NSP

Add SMP support for Broadcom's Northstar Plus SoC
cpu enable method. This changes also consolidates
iProc family's - BCM NSP and BCM Kona, platform
SMP handling in a common file.

Northstar Plus SoC is based on ARM Cortex-A9
revision r3p0 which requires configuration for ARM
Errata 764369 for SMP. This change adds the needed
configuration option.

Signed-off-by: Kapil Hali <kapilh@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

3 files changed, 71 insertions, 3 deletions

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index c32628b045e4..6e3e043ce332 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -40,6 +40,8 @@ config ARCH_BCM_NSP
         select ARCH_BCM_IPROC
         select ARM_ERRATA_754322
         select ARM_ERRATA_775420
+        select ARM_ERRATA_764369 if SMP
+        select HAVE_SMP
         help
           Support for Broadcom Northstar Plus SoC.
           Broadcom Northstar Plus family of SoCs are used for switching control
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index 892261fec0ae..5193a25a56ca 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -14,7 +14,11 @@
 obj-$(CONFIG_ARCH_BCM_CYGNUS) +=  bcm_cygnus.o
 
 # Northstar Plus
-obj-$(CONFIG_ARCH_BCM_NSP) += bcm_nsp.o
+obj-$(CONFIG_ARCH_BCM_NSP)      += bcm_nsp.o
+
+ifeq ($(CONFIG_ARCH_BCM_NSP),y)
+obj-$(CONFIG_SMP)               += platsmp.o
+endif
 
 # BCM281XX
 obj-$(CONFIG_ARCH_BCM_281XX)    += board_bcm281xx.o
@@ -23,7 +27,7 @@ obj-$(CONFIG_ARCH_BCM_281XX)	+= board_bcm281xx.o
 obj-$(CONFIG_ARCH_BCM_21664)    += board_bcm21664.o
 
 # BCM281XX and BCM21664 SMP support
-obj-$(CONFIG_ARCH_BCM_MOBILE_SMP) += kona_smp.o
+obj-$(CONFIG_ARCH_BCM_MOBILE_SMP) += platsmp.o
 
 # BCM281XX and BCM21664 L2 cache control
 obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o
diff --git a/arch/arm/mach-bcm/kona_smp.c b/arch/arm/mach-bcm/platsmp.c
index 15af781228a5..ea4201e6d0c9 100644
--- a/arch/arm/mach-bcm/kona_smp.c
+++ b/arch/arm/mach-bcm/platsmp.c
@@ -12,12 +12,17 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/init.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
+#include <linux/init.h>
 #include <linux/io.h>
+#include <linux/jiffies.h>
 #include <linux/of.h>
 #include <linux/sched.h>
+#include <linux/smp.h>
 
+#include <asm/cacheflush.h>
 #include <asm/smp.h>
 #include <asm/smp_plat.h>
 #include <asm/smp_scu.h>
@@ -76,6 +81,36 @@ static int __init scu_a9_enable(void)
         return 0;
 }
 
+static int nsp_write_lut(void)
+{
+        void __iomem *sku_rom_lut;
+        phys_addr_t secondary_startup_phy;
+
+        if (!secondary_boot_addr) {
+                pr_warn("required secondary boot register not specified\n");
+                return -EINVAL;
+        }
+
+        sku_rom_lut = ioremap_nocache((phys_addr_t)secondary_boot_addr,
+                                                sizeof(secondary_boot_addr));
+        if (!sku_rom_lut) {
+                pr_warn("unable to ioremap SKU-ROM LUT register\n");
+                return -ENOMEM;
+        }
+
+        secondary_startup_phy = virt_to_phys(secondary_startup);
+        BUG_ON(secondary_startup_phy > (phys_addr_t)U32_MAX);
+
+        writel_relaxed(secondary_startup_phy, sku_rom_lut);
+
+        /* Ensure the write is visible to the secondary core */
+        smp_wmb();
+
+        iounmap(sku_rom_lut);
+
+        return 0;
+}
+
 static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
 {
         static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
@@ -220,9 +255,36 @@ static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
         return -ENXIO;
 }
 
+static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+        int ret;
+
+        /*
+         * After wake up, secondary core branches to the startup
+         * address programmed at SKU ROM LUT location.
+         */
+        ret = nsp_write_lut();
+        if (ret) {
+                pr_err("unable to write startup addr to SKU ROM LUT\n");
+                goto out;
+        }
+
+        /* Send a CPU wakeup interrupt to the secondary core */
+        arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+out:
+        return ret;
+}
+
 static struct smp_operations bcm_smp_ops __initdata = {
         .smp_prepare_cpus       = bcm_smp_prepare_cpus,
         .smp_boot_secondary     = kona_boot_secondary,
 };
 CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
                         &bcm_smp_ops);
+
+struct smp_operations nsp_smp_ops __initdata = {
+        .smp_prepare_cpus       = bcm_smp_prepare_cpus,
+        .smp_boot_secondary     = nsp_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);