[PATCH v6 0/5] SMP support for Broadcom NSP

[PATCH v6 0/5] SMP support for Broadcom NSP

[Kapil Hali]

Changes in V6:
* Updated 'enable-method' and 'secondary-boot-reg' device tree
property for Kona and NSP in DT and documentation file.

Changes in v5:
* Made 'enable-method' for SMP per 'cpu' core instead of 'cpus'
node, in the DT files for BCM NSP and BCM4708.

Change in v4:
* Cleaned up kona_smp.c and associated DT file.
* Corrected documentation for DT bindings.
* Corrected secondary-boot-reg entry for bcm4708 DT file.

Change in v3:
* Fixed patch subject from RESEND PATCH to PATCH
* Deleted arch/arm/mach-bcm/bcm_nsp.h file
* Removed inclusion of header file bcm_nsp.h in platsmp.c
* Removed unused variable 'timeout' in nsp_boot_secondary()

Changes in v2:
Removed the pen_holding method of SMP bringup for NSP SoC and
replaced it with simple wakeup of secondary core using ARM IPI.


This series adds SMP support for Broadcom's Northstar Plus SoC.

There are similar SMP enablement methods for many ARMv7 bsed SoCs.
BCM NSP SoC, has a typical such mechanism - after power-on, the
secondary core is held in a standby state, primary core provides a
startup address for the secondary core and wakes it up. Booting of
the secondary core is serialized using pen_release global variable.

The startup address is programmed at a special register location
which is defined in the device tree using a "secondary-boot-reg"
property in a node whose "enable-method" property matches.

The first patch adds cpu-enable-method in the device tree bindings
documentation. It also updates ARM CPU device tree documentation
with Broadcom Northstar Plus CPU details.

The second patch adds SMP support to the BCM NSP device tree file.

The third patch, enables SMP on BCM NSP. It also consolidates
common SMP handling between BCM NSP and BCM Kona.

The final patch, enables SMP on BCM 4708 and this patch is pulled
in from Jon Mason's patch from the mailing list.

This patch series is constructed based on Linux v4.4-rc1.

The source code is available at GITHUB:
https://github.com/Broadcom/cygnus-linux/tree/nsp-smp-v2

Jon Mason (1):
  ARM: BCM: Add SMP support for Broadcom 4708

Kapil Hali (4):
  dt-bindings: add SMP enable-method for Broadcom NSP
  ARM: BCM: Clean up SMP support for Broadcom Kona
  ARM: dts: Add SMP support for Broadcom NSP
  ARM: BCM: Add SMP support for Broadcom NSP

 .../bindings/arm/bcm/brcm,bcm11351-cpu-method.txt  |  12 +-
 .../bindings/arm/bcm/brcm,nsp-cpu-method.txt       |  39 ++++++
 Documentation/devicetree/bindings/arm/cpus.txt     |   1 +
 arch/arm/boot/dts/bcm-nsp.dtsi                     |  33 +++--
 arch/arm/boot/dts/bcm11351.dtsi                    |   4 +-
 arch/arm/boot/dts/bcm21664.dtsi                    |   4 +-
 arch/arm/boot/dts/bcm4708.dtsi                     |   3 +-
 arch/arm/mach-bcm/Kconfig                          |   3 +
 arch/arm/mach-bcm/Makefile                         |  11 +-
 arch/arm/mach-bcm/{kona_smp.c => platsmp.c}        | 144 +++++++++++++++++----
 10 files changed, 201 insertions(+), 53 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
 rename arch/arm/mach-bcm/{kona_smp.c => platsmp.c} (63%)

-- 
2.1.0

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[PATCH v6 1/5] dt-bindings: add SMP enable-method for Broadcom NSP

[Kapil Hali]

Add a compatible string "brcm,bcm-nsp-smp" for Broadcom's
Northstar Plus CPU to the 32-bit ARM CPU device tree binding
documentation file and create a new binding documentation for
Northstar Plus CPU.

Signed-off-by: Kapil Hali <kapilh@broadcom.com>
---
 .../bindings/arm/bcm/brcm,nsp-cpu-method.txt       | 39 ++++++++++++++++++++++
 Documentation/devicetree/bindings/arm/cpus.txt     |  1 +
 2 files changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
new file mode 100644
index 0000000..677ef9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
@@ -0,0 +1,39 @@
+Broadcom Northstar Plus SoC CPU Enable Method
+---------------------------------------------
+This binding defines the enable method used for starting secondary
+CPU in the following Broadcom SoCs:
+  BCM58522, BCM58525, BCM58535, BCM58622, BCM58623, BCM58625, BCM88312
+
+The enable method is specified by defining the following required
+properties in the corresponding secondary "cpu" device tree node:
+  - enable-method = "brcm,bcm-nsp-smp";
+  - secondary-boot-reg = <...>;
+
+The secondary-boot-reg property is a u32 value that specifies the
+physical address of the register which should hold the common
+entry point for a secondary CPU. This entry is cpu node specific
+and should be added per cpu. E.g., in case of NSP (BCM58625) which
+is a dual core CPU SoC, this entry should be added to cpu1 node.
+
+
+Example:
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&L2>;
+			reg = <0>;
+		};
+
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&L2>;
+			enable-method = "brcm,bcm-nsp-smp";
+			secondary-boot-reg = <0xffff042c>;
+			reg = <1>;
+		};
+	};
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 3a07a87..d191554 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -190,6 +190,7 @@ nodes to be present and contain the properties described below.
 			    "allwinner,sun6i-a31"
 			    "allwinner,sun8i-a23"
 			    "arm,psci"
+			    "brcm,bcm-nsp-smp"
 			    "brcm,brahma-b15"
 			    "marvell,armada-375-smp"
 			    "marvell,armada-380-smp"
-- 
2.1.0

[PATCH v6 2/5] ARM: BCM: Clean up SMP support for Broadcom Kona

[Kapil Hali]

These changes cleans up SMP implementaion for Broadcom's
Kona SoC which are required for handling SMP for iProc
family of SoCs at a single place for BCM NSP and BCM Kona.

Signed-off-by: Kapil Hali <kapilh@broadcom.com>
---
 .../bindings/arm/bcm/brcm,bcm11351-cpu-method.txt  | 12 ++--
 arch/arm/boot/dts/bcm11351.dtsi                    |  4 +-
 arch/arm/boot/dts/bcm21664.dtsi                    |  4 +-
 arch/arm/mach-bcm/kona_smp.c                       | 82 ++++++++++++++--------
 4 files changed, 64 insertions(+), 38 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
index 8240c02..3c5fe4b 100644
--- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
@@ -1,17 +1,17 @@
 Broadcom Kona Family CPU Enable Method
 --------------------------------------
 This binding defines the enable method used for starting secondary
-CPUs in the following Broadcom SoCs:
+CPU in the following Broadcom SoCs:
   BCM11130, BCM11140, BCM11351, BCM28145, BCM28155, BCM21664
 
 The enable method is specified by defining the following required
-properties in the "cpus" device tree node:
+properties in the corresponding secondary "cpu" device tree node:
   - enable-method = "brcm,bcm11351-cpu-method";
   - secondary-boot-reg = <...>;
 
 The secondary-boot-reg property is a u32 value that specifies the
-physical address of the register used to request the ROM holding pen
-code release a secondary CPU.  The value written to the register is
+physical address of the register used to request the ROM code
+release a secondary CPU.  The value written to the register is
 formed by encoding the target CPU id into the low bits of the
 physical start address it should jump to.
 
@@ -19,8 +19,6 @@ Example:
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		enable-method = "brcm,bcm11351-cpu-method";
-		secondary-boot-reg = <0x3500417c>;
 
 		cpu0: cpu@0 {
 			device_type = "cpu";
@@ -31,6 +29,8 @@ Example:
 		cpu1: cpu@1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
+			enable-method = "brcm,bcm11351-cpu-method";
+			secondary-boot-reg = <0x3500417c>;
 			reg = <1>;
 		};
 	};
diff --git a/arch/arm/boot/dts/bcm11351.dtsi b/arch/arm/boot/dts/bcm11351.dtsi
index 2ddaa51..18045c3 100644
--- a/arch/arm/boot/dts/bcm11351.dtsi
+++ b/arch/arm/boot/dts/bcm11351.dtsi
@@ -30,8 +30,6 @@
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		enable-method = "brcm,bcm11351-cpu-method";
-		secondary-boot-reg = <0x3500417c>;
 
 		cpu0: cpu@0 {
 			device_type = "cpu";
@@ -42,6 +40,8 @@
 		cpu1: cpu@1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
+			enable-method = "brcm,bcm11351-cpu-method";
+			secondary-boot-reg = <0x3500417c>;
 			reg = <1>;
 		};
 	};
diff --git a/arch/arm/boot/dts/bcm21664.dtsi b/arch/arm/boot/dts/bcm21664.dtsi
index 2016b72..6dde95f 100644
--- a/arch/arm/boot/dts/bcm21664.dtsi
+++ b/arch/arm/boot/dts/bcm21664.dtsi
@@ -30,8 +30,6 @@
        cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		enable-method = "brcm,bcm11351-cpu-method";
-		secondary-boot-reg = <0x35004178>;
 
 		cpu0: cpu@0 {
 			device_type = "cpu";
@@ -42,6 +40,8 @@
 		cpu1: cpu@1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
+			enable-method = "brcm,bcm11351-cpu-method";
+			secondary-boot-reg = <0x35004178>;
 			reg = <1>;
 		};
 	};
diff --git a/arch/arm/mach-bcm/kona_smp.c b/arch/arm/mach-bcm/kona_smp.c
index 66a0465..15af781 100644
--- a/arch/arm/mach-bcm/kona_smp.c
+++ b/arch/arm/mach-bcm/kona_smp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014 Broadcom Corporation
+ * Copyright (C) 2014-2015 Broadcom Corporation
  * Copyright 2014 Linaro Limited
  *
  * This program is free software; you can redistribute it and/or
@@ -30,9 +30,10 @@
 
 /* Name of device node property defining secondary boot register location */
 #define OF_SECONDARY_BOOT	"secondary-boot-reg"
+#define MPIDR_CPUID_BITMASK	0x3
 
 /* I/O address of register used to coordinate secondary core startup */
-static u32	secondary_boot;
+static u32	secondary_boot_addr;
 
 /*
  * Enable the Cortex A9 Snoop Control Unit
@@ -78,44 +79,68 @@ static int __init scu_a9_enable(void)
 static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
 {
 	static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
-	struct device_node *node;
+	struct device_node *cpus_node = NULL;
+	struct device_node *cpu_node = NULL;
 	int ret;
 
-	BUG_ON(secondary_boot);		/* We're called only once */
-
 	/*
 	 * This function is only called via smp_ops->smp_prepare_cpu().
 	 * That only happens if a "/cpus" device tree node exists
 	 * and has an "enable-method" property that selects the SMP
 	 * operations defined herein.
 	 */
-	node = of_find_node_by_path("/cpus");
-	BUG_ON(!node);
-
-	/*
-	 * Our secondary enable method requires a "secondary-boot-reg"
-	 * property to specify a register address used to request the
-	 * ROM code boot a secondary code.  If we have any trouble
-	 * getting this we fall back to uniprocessor mode.
-	 */
-	if (of_property_read_u32(node, OF_SECONDARY_BOOT, &secondary_boot)) {
-		pr_err("%s: missing/invalid " OF_SECONDARY_BOOT " property\n",
-			node->name);
-		ret = -ENOENT;		/* Arrange to disable SMP */
-		goto out;
+	cpus_node = of_find_node_by_path("/cpus");
+	if (!cpus_node)
+		return;
+
+	for_each_child_of_node(cpus_node, cpu_node) {
+		u32 cpuid;
+
+		if (of_node_cmp(cpu_node->type, "cpu"))
+			continue;
+
+		if (of_property_read_u32(cpu_node, "reg", &cpuid)) {
+			pr_debug("%s: missing reg property\n",
+				     cpu_node->full_name);
+			ret = -ENOENT;
+			goto out;
+		}
+
+		/*
+		 * "secondary-boot-reg" property should be defined only
+		 * for secondary cpu
+		 */
+		if ((cpuid & MPIDR_CPUID_BITMASK) == 1) {
+			/*
+			 * Our secondary enable method requires a
+			 * "secondary-boot-reg" property to specify a register
+			 * address used to request the ROM code boot a secondary
+			 * core. If we have any trouble getting this we fall
+			 * back to uniprocessor mode.
+			 */
+			if (of_property_read_u32(cpu_node,
+						OF_SECONDARY_BOOT,
+						&secondary_boot_addr)) {
+				pr_warn("%s: no" OF_SECONDARY_BOOT "property\n",
+					cpu_node->name);
+				ret = -ENOENT;
+				goto out;
+			}
+		}
 	}
 
 	/*
-	 * Enable the SCU on Cortex A9 based SoCs.  If -ENOENT is
+	 * Enable the SCU on Cortex A9 based SoCs. If -ENOENT is
 	 * returned, the SoC reported a uniprocessor configuration.
 	 * We bail on any other error.
 	 */
 	ret = scu_a9_enable();
 out:
-	of_node_put(node);
+	of_node_put(cpu_node);
+	of_node_put(cpus_node);
+
 	if (ret) {
 		/* Update the CPU present map to reflect uniprocessor mode */
-		BUG_ON(ret != -ENOENT);
 		pr_warn("disabling SMP\n");
 		init_cpu_present(&only_cpu_0);
 	}
@@ -139,7 +164,7 @@ out:
  * - Wait for the secondary boot register to be re-written, which
  *   indicates the secondary core has started.
  */
-static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
+static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	void __iomem *boot_reg;
 	phys_addr_t boot_func;
@@ -154,15 +179,16 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
 		return -EINVAL;
 	}
 
-	if (!secondary_boot) {
+	if (!secondary_boot_addr) {
 		pr_err("required secondary boot register not specified\n");
 		return -EINVAL;
 	}
 
-	boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
+	boot_reg = ioremap_nocache(
+			(phys_addr_t)secondary_boot_addr, sizeof(u32));
 	if (!boot_reg) {
 		pr_err("unable to map boot register for cpu %u\n", cpu_id);
-		return -ENOSYS;
+		return -ENOMEM;
 	}
 
 	/*
@@ -191,12 +217,12 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
 
 	pr_err("timeout waiting for cpu %u to start\n", cpu_id);
 
-	return -ENOSYS;
+	return -ENXIO;
 }
 
 static struct smp_operations bcm_smp_ops __initdata = {
 	.smp_prepare_cpus	= bcm_smp_prepare_cpus,
-	.smp_boot_secondary	= bcm_boot_secondary,
+	.smp_boot_secondary	= kona_boot_secondary,
 };
 CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
 			&bcm_smp_ops);
-- 
2.1.0

[PATCH v6 3/5] ARM: dts: Add SMP support for Broadcom NSP

[Kapil Hali]

Add device tree changes required for providing SMP support
for Broadcom Northstar Plus SoC.

Signed-off-by: Kapil Hali <kapilh@broadcom.com>
---
 arch/arm/boot/dts/bcm-nsp.dtsi | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/arch/arm/boot/dts/bcm-nsp.dtsi b/arch/arm/boot/dts/bcm-nsp.dtsi
index 58aca27..d9f8b31 100644
--- a/arch/arm/boot/dts/bcm-nsp.dtsi
+++ b/arch/arm/boot/dts/bcm-nsp.dtsi
@@ -40,24 +40,33 @@
 	model = "Broadcom Northstar Plus SoC";
 	interrupt-parent = <&gic>;
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&L2>;
+			reg = <0x0>;
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&L2>;
+			enable-method = "brcm,bcm-nsp-smp";
+			secondary-boot-reg = <0xffff042c>;
+			reg = <0x1>;
+		};
+	};
+
 	mpcore {
 		compatible = "simple-bus";
 		ranges = <0x00000000 0x19020000 0x00003000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
 
-		cpus {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			cpu@0 {
-				device_type = "cpu";
-				compatible = "arm,cortex-a9";
-				next-level-cache = <&L2>;
-				reg = <0x0>;
-			};
-		};
-
 		L2: l2-cache {
 			compatible = "arm,pl310-cache";
 			reg = <0x2000 0x1000>;
-- 
2.1.0

[PATCH v6 4/5] ARM: BCM: Add SMP support for Broadcom NSP

[Kapil Hali]

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>
---
 arch/arm/mach-bcm/Kconfig                   |  2 +
 arch/arm/mach-bcm/Makefile                  |  8 +++-
 arch/arm/mach-bcm/{kona_smp.c => platsmp.c} | 64 ++++++++++++++++++++++++++++-
 3 files changed, 71 insertions(+), 3 deletions(-)
 rename arch/arm/mach-bcm/{kona_smp.c => platsmp.c} (81%)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index 8c53c55..83765a0 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 892261f..5193a25 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
similarity index 81%
rename from arch/arm/mach-bcm/kona_smp.c
rename to arch/arm/mach-bcm/platsmp.c
index 15af781..ea4201e 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);
-- 
2.1.0

[PATCH v6 5/5] ARM: BCM: Add SMP support for Broadcom 4708

[Kapil Hali]

From: Jon Mason <jonmason@broadcom.com>

Add SMP support for Broadcom's 4708 SoCs.

Signed-off-by: Jon Mason <jonmason@broadcom.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Kapil Hali <kapilh@broadcom.com>
---
 arch/arm/boot/dts/bcm4708.dtsi | 3 ++-
 arch/arm/mach-bcm/Kconfig      | 1 +
 arch/arm/mach-bcm/Makefile     | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/bcm4708.dtsi b/arch/arm/boot/dts/bcm4708.dtsi
index 31141e8..f2d2239 100644
--- a/arch/arm/boot/dts/bcm4708.dtsi
+++ b/arch/arm/boot/dts/bcm4708.dtsi
@@ -27,8 +27,9 @@
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			next-level-cache = <&L2>;
+			enable-method = "brcm,bcm-nsp-smp";
+			secondary-boot-reg = <0xffff0400>;
 			reg = <0x1>;
 		};
 	};
-
 };
diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index 83765a0..e85246f 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -54,6 +54,7 @@ config ARCH_BCM_NSP
 config ARCH_BCM_5301X
 	bool "Broadcom BCM470X / BCM5301X ARM SoC" if ARCH_MULTI_V7
 	select ARCH_BCM_IPROC
+	select HAVE_SMP
 	help
 	  Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
 
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index 5193a25..7d66515 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -43,6 +43,9 @@ obj-$(CONFIG_ARCH_BCM2835)	+= board_bcm2835.o
 
 # BCM5301X
 obj-$(CONFIG_ARCH_BCM_5301X)	+= bcm_5301x.o
+ifeq ($(CONFIG_ARCH_BCM_5301X),y)
+obj-$(CONFIG_SMP)		+= platsmp.o
+endif
 
 # BCM63XXx
 ifeq ($(CONFIG_ARCH_BCM_63XX),y)
-- 
2.1.0

Re: [PATCH v6 1/5] dt-bindings: add SMP enable-method for Broadcom NSP

[Florian Fainelli]

Le 05/12/2015 03:53, Kapil Hali a écrit :
> Add a compatible string "brcm,bcm-nsp-smp" for Broadcom's
> Northstar Plus CPU to the 32-bit ARM CPU device tree binding
> documentation file and create a new binding documentation for
> Northstar Plus CPU.
> 
> Signed-off-by: Kapil Hali <kapilh-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>

Applied to devicetree/next, thanks!
-- 
Florian
--
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Re: [PATCH v6 2/5] ARM: BCM: Clean up SMP support for Broadcom Kona

[Florian Fainelli]

Le 05/12/2015 03:53, Kapil Hali a écrit :
> These changes cleans up SMP implementaion for Broadcom's
> Kona SoC which are required for handling SMP for iProc
> family of SoCs at a single place for BCM NSP and BCM Kona.
> 
> Signed-off-by: Kapil Hali <kapilh@broadcom.com>

Applied to soc/next, thanks!
-- 
Florian

Re: [PATCH v6 3/5] ARM: dts: Add SMP support for Broadcom NSP

[Florian Fainelli]

Le 05/12/2015 03:53, Kapil Hali a écrit :
> Add device tree changes required for providing SMP support
> for Broadcom Northstar Plus SoC.
> 
> Signed-off-by: Kapil Hali <kapilh@broadcom.com>

Applied to devicetree/next; thanks!
-- 
Florian

Re: [PATCH v6 4/5] ARM: BCM: Add SMP support for Broadcom NSP

[Florian Fainelli]

Le 05/12/2015 03:53, Kapil Hali a écrit :
> 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>

Applied to soc/next, thanks!
-- 
Florian

Re: [PATCH v6 5/5] ARM: BCM: Add SMP support for Broadcom 4708

[Florian Fainelli]

Le 05/12/2015 03:53, Kapil Hali a écrit :
> From: Jon Mason <jonmason-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> 
> Add SMP support for Broadcom's 4708 SoCs.
> 
> Signed-off-by: Jon Mason <jonmason-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
> Acked-by: Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org>
> Tested-by: Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org>
> Signed-off-by: Kapil Hali <kapilh-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>

Applied to soc/next, thanks!
-- 
Florian
--
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Re: [PATCH v6 1/5] dt-bindings: add SMP enable-method for Broadcom NSP

[Rob Herring]

On Sat, Dec 05, 2015 at 06:53:40AM -0500, Kapil Hali wrote:
> Add a compatible string "brcm,bcm-nsp-smp" for Broadcom's
> Northstar Plus CPU to the 32-bit ARM CPU device tree binding
> documentation file and create a new binding documentation for
> Northstar Plus CPU.
> 
> Signed-off-by: Kapil Hali <kapilh@broadcom.com>

Acked-by: Rob Herring <robh@kernel.org>

> ---
>  .../bindings/arm/bcm/brcm,nsp-cpu-method.txt       | 39 ++++++++++++++++++++++
>  Documentation/devicetree/bindings/arm/cpus.txt     |  1 +
>  2 files changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
> new file mode 100644
> index 0000000..677ef9d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/bcm/brcm,nsp-cpu-method.txt
> @@ -0,0 +1,39 @@
> +Broadcom Northstar Plus SoC CPU Enable Method
> +---------------------------------------------
> +This binding defines the enable method used for starting secondary
> +CPU in the following Broadcom SoCs:
> +  BCM58522, BCM58525, BCM58535, BCM58622, BCM58623, BCM58625, BCM88312
> +
> +The enable method is specified by defining the following required
> +properties in the corresponding secondary "cpu" device tree node:
> +  - enable-method = "brcm,bcm-nsp-smp";
> +  - secondary-boot-reg = <...>;
> +
> +The secondary-boot-reg property is a u32 value that specifies the
> +physical address of the register which should hold the common
> +entry point for a secondary CPU. This entry is cpu node specific
> +and should be added per cpu. E.g., in case of NSP (BCM58625) which
> +is a dual core CPU SoC, this entry should be added to cpu1 node.
> +
> +
> +Example:
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a9";
> +			next-level-cache = <&L2>;
> +			reg = <0>;
> +		};
> +
> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a9";
> +			next-level-cache = <&L2>;
> +			enable-method = "brcm,bcm-nsp-smp";
> +			secondary-boot-reg = <0xffff042c>;
> +			reg = <1>;
> +		};
> +	};
> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> index 3a07a87..d191554 100644
> --- a/Documentation/devicetree/bindings/arm/cpus.txt
> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
> @@ -190,6 +190,7 @@ nodes to be present and contain the properties described below.
>  			    "allwinner,sun6i-a31"
>  			    "allwinner,sun8i-a23"
>  			    "arm,psci"
> +			    "brcm,bcm-nsp-smp"
>  			    "brcm,brahma-b15"
>  			    "marvell,armada-375-smp"
>  			    "marvell,armada-380-smp"
> -- 
> 2.1.0
> 

Re: [PATCH v6 2/5] ARM: BCM: Clean up SMP support for Broadcom Kona

[Rob Herring]

On Sat, Dec 05, 2015 at 06:53:41AM -0500, Kapil Hali wrote:
> These changes cleans up SMP implementaion for Broadcom's
> Kona SoC which are required for handling SMP for iProc
> family of SoCs at a single place for BCM NSP and BCM Kona.
> 
> Signed-off-by: Kapil Hali <kapilh@broadcom.com>
> ---
>  .../bindings/arm/bcm/brcm,bcm11351-cpu-method.txt  | 12 ++--
>  arch/arm/boot/dts/bcm11351.dtsi                    |  4 +-
>  arch/arm/boot/dts/bcm21664.dtsi                    |  4 +-

For the bindings:

Acked-by: Rob Herring <robh@kernel.org>

>  arch/arm/mach-bcm/kona_smp.c                       | 82 ++++++++++++++--------
>  4 files changed, 64 insertions(+), 38 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
> index 8240c02..3c5fe4b 100644
> --- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
> +++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm11351-cpu-method.txt
> @@ -1,17 +1,17 @@
>  Broadcom Kona Family CPU Enable Method
>  --------------------------------------
>  This binding defines the enable method used for starting secondary
> -CPUs in the following Broadcom SoCs:
> +CPU in the following Broadcom SoCs:
>    BCM11130, BCM11140, BCM11351, BCM28145, BCM28155, BCM21664
>  
>  The enable method is specified by defining the following required
> -properties in the "cpus" device tree node:
> +properties in the corresponding secondary "cpu" device tree node:
>    - enable-method = "brcm,bcm11351-cpu-method";
>    - secondary-boot-reg = <...>;
>  
>  The secondary-boot-reg property is a u32 value that specifies the
> -physical address of the register used to request the ROM holding pen
> -code release a secondary CPU.  The value written to the register is
> +physical address of the register used to request the ROM code
> +release a secondary CPU.  The value written to the register is
>  formed by encoding the target CPU id into the low bits of the
>  physical start address it should jump to.
>  
> @@ -19,8 +19,6 @@ Example:
>  	cpus {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		enable-method = "brcm,bcm11351-cpu-method";
> -		secondary-boot-reg = <0x3500417c>;
>  
>  		cpu0: cpu@0 {
>  			device_type = "cpu";
> @@ -31,6 +29,8 @@ Example:
>  		cpu1: cpu@1 {
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a9";
> +			enable-method = "brcm,bcm11351-cpu-method";
> +			secondary-boot-reg = <0x3500417c>;
>  			reg = <1>;
>  		};
>  	};
> diff --git a/arch/arm/boot/dts/bcm11351.dtsi b/arch/arm/boot/dts/bcm11351.dtsi
> index 2ddaa51..18045c3 100644
> --- a/arch/arm/boot/dts/bcm11351.dtsi
> +++ b/arch/arm/boot/dts/bcm11351.dtsi
> @@ -30,8 +30,6 @@
>  	cpus {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		enable-method = "brcm,bcm11351-cpu-method";
> -		secondary-boot-reg = <0x3500417c>;
>  
>  		cpu0: cpu@0 {
>  			device_type = "cpu";
> @@ -42,6 +40,8 @@
>  		cpu1: cpu@1 {
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a9";
> +			enable-method = "brcm,bcm11351-cpu-method";
> +			secondary-boot-reg = <0x3500417c>;
>  			reg = <1>;
>  		};
>  	};
> diff --git a/arch/arm/boot/dts/bcm21664.dtsi b/arch/arm/boot/dts/bcm21664.dtsi
> index 2016b72..6dde95f 100644
> --- a/arch/arm/boot/dts/bcm21664.dtsi
> +++ b/arch/arm/boot/dts/bcm21664.dtsi
> @@ -30,8 +30,6 @@
>         cpus {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		enable-method = "brcm,bcm11351-cpu-method";
> -		secondary-boot-reg = <0x35004178>;
>  
>  		cpu0: cpu@0 {
>  			device_type = "cpu";
> @@ -42,6 +40,8 @@
>  		cpu1: cpu@1 {
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a9";
> +			enable-method = "brcm,bcm11351-cpu-method";
> +			secondary-boot-reg = <0x35004178>;
>  			reg = <1>;
>  		};
>  	};
> diff --git a/arch/arm/mach-bcm/kona_smp.c b/arch/arm/mach-bcm/kona_smp.c
> index 66a0465..15af781 100644
> --- a/arch/arm/mach-bcm/kona_smp.c
> +++ b/arch/arm/mach-bcm/kona_smp.c
> @@ -1,5 +1,5 @@
>  /*
> - * Copyright (C) 2014 Broadcom Corporation
> + * Copyright (C) 2014-2015 Broadcom Corporation
>   * Copyright 2014 Linaro Limited
>   *
>   * This program is free software; you can redistribute it and/or
> @@ -30,9 +30,10 @@
>  
>  /* Name of device node property defining secondary boot register location */
>  #define OF_SECONDARY_BOOT	"secondary-boot-reg"
> +#define MPIDR_CPUID_BITMASK	0x3
>  
>  /* I/O address of register used to coordinate secondary core startup */
> -static u32	secondary_boot;
> +static u32	secondary_boot_addr;
>  
>  /*
>   * Enable the Cortex A9 Snoop Control Unit
> @@ -78,44 +79,68 @@ static int __init scu_a9_enable(void)
>  static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
>  {
>  	static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
> -	struct device_node *node;
> +	struct device_node *cpus_node = NULL;
> +	struct device_node *cpu_node = NULL;
>  	int ret;
>  
> -	BUG_ON(secondary_boot);		/* We're called only once */
> -
>  	/*
>  	 * This function is only called via smp_ops->smp_prepare_cpu().
>  	 * That only happens if a "/cpus" device tree node exists
>  	 * and has an "enable-method" property that selects the SMP
>  	 * operations defined herein.
>  	 */
> -	node = of_find_node_by_path("/cpus");
> -	BUG_ON(!node);
> -
> -	/*
> -	 * Our secondary enable method requires a "secondary-boot-reg"
> -	 * property to specify a register address used to request the
> -	 * ROM code boot a secondary code.  If we have any trouble
> -	 * getting this we fall back to uniprocessor mode.
> -	 */
> -	if (of_property_read_u32(node, OF_SECONDARY_BOOT, &secondary_boot)) {
> -		pr_err("%s: missing/invalid " OF_SECONDARY_BOOT " property\n",
> -			node->name);
> -		ret = -ENOENT;		/* Arrange to disable SMP */
> -		goto out;
> +	cpus_node = of_find_node_by_path("/cpus");
> +	if (!cpus_node)
> +		return;
> +
> +	for_each_child_of_node(cpus_node, cpu_node) {
> +		u32 cpuid;
> +
> +		if (of_node_cmp(cpu_node->type, "cpu"))
> +			continue;
> +
> +		if (of_property_read_u32(cpu_node, "reg", &cpuid)) {
> +			pr_debug("%s: missing reg property\n",
> +				     cpu_node->full_name);
> +			ret = -ENOENT;
> +			goto out;
> +		}
> +
> +		/*
> +		 * "secondary-boot-reg" property should be defined only
> +		 * for secondary cpu
> +		 */
> +		if ((cpuid & MPIDR_CPUID_BITMASK) == 1) {
> +			/*
> +			 * Our secondary enable method requires a
> +			 * "secondary-boot-reg" property to specify a register
> +			 * address used to request the ROM code boot a secondary
> +			 * core. If we have any trouble getting this we fall
> +			 * back to uniprocessor mode.
> +			 */
> +			if (of_property_read_u32(cpu_node,
> +						OF_SECONDARY_BOOT,
> +						&secondary_boot_addr)) {
> +				pr_warn("%s: no" OF_SECONDARY_BOOT "property\n",
> +					cpu_node->name);
> +				ret = -ENOENT;
> +				goto out;
> +			}
> +		}
>  	}
>  
>  	/*
> -	 * Enable the SCU on Cortex A9 based SoCs.  If -ENOENT is
> +	 * Enable the SCU on Cortex A9 based SoCs. If -ENOENT is
>  	 * returned, the SoC reported a uniprocessor configuration.
>  	 * We bail on any other error.
>  	 */
>  	ret = scu_a9_enable();
>  out:
> -	of_node_put(node);
> +	of_node_put(cpu_node);
> +	of_node_put(cpus_node);
> +
>  	if (ret) {
>  		/* Update the CPU present map to reflect uniprocessor mode */
> -		BUG_ON(ret != -ENOENT);
>  		pr_warn("disabling SMP\n");
>  		init_cpu_present(&only_cpu_0);
>  	}
> @@ -139,7 +164,7 @@ out:
>   * - Wait for the secondary boot register to be re-written, which
>   *   indicates the secondary core has started.
>   */
> -static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
> +static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  {
>  	void __iomem *boot_reg;
>  	phys_addr_t boot_func;
> @@ -154,15 +179,16 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  		return -EINVAL;
>  	}
>  
> -	if (!secondary_boot) {
> +	if (!secondary_boot_addr) {
>  		pr_err("required secondary boot register not specified\n");
>  		return -EINVAL;
>  	}
>  
> -	boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
> +	boot_reg = ioremap_nocache(
> +			(phys_addr_t)secondary_boot_addr, sizeof(u32));
>  	if (!boot_reg) {
>  		pr_err("unable to map boot register for cpu %u\n", cpu_id);
> -		return -ENOSYS;
> +		return -ENOMEM;
>  	}
>  
>  	/*
> @@ -191,12 +217,12 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  
>  	pr_err("timeout waiting for cpu %u to start\n", cpu_id);
>  
> -	return -ENOSYS;
> +	return -ENXIO;
>  }
>  
>  static struct smp_operations bcm_smp_ops __initdata = {
>  	.smp_prepare_cpus	= bcm_smp_prepare_cpus,
> -	.smp_boot_secondary	= bcm_boot_secondary,
> +	.smp_boot_secondary	= kona_boot_secondary,
>  };
>  CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
>  			&bcm_smp_ops);
> -- 
> 2.1.0
>