+++ /dev/null
-From a0ad1511d5805b95ac4c454d7904c670a1696055 Mon Sep 17 00:00:00 2001
-From: Kapil Hali <kapilh@broadcom.com>
-Date: Wed, 14 Oct 2015 13:47:00 -0400
-Subject: [PATCH] ARM: BCM: Add SMP support for Broadcom NSP
-
-Add SMP support for Broadcom's Northstar Plus SoC,
-cpu enable method and pen_release procedures. This
-changes also consolidates iProc family's - BCM NSP
-and BCM Kona, 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/Makefile | 2 +-
- arch/arm/mach-bcm/bcm_nsp.h | 19 +++
- arch/arm/mach-bcm/headsmp.S | 37 +++++
- arch/arm/mach-bcm/kona_smp.c | 202 ---------------------------
- arch/arm/mach-bcm/platsmp.c | 326 +++++++++++++++++++++++++++++++++++++++++++
- 5 files changed, 383 insertions(+), 203 deletions(-)
- create mode 100644 arch/arm/mach-bcm/bcm_nsp.h
- create mode 100644 arch/arm/mach-bcm/headsmp.S
- delete mode 100644 arch/arm/mach-bcm/kona_smp.c
- create mode 100644 arch/arm/mach-bcm/platsmp.c
-
---- a/arch/arm/mach-bcm/Makefile
-+++ b/arch/arm/mach-bcm/Makefile
-@@ -20,7 +20,7 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bc
- obj-$(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
---- /dev/null
-+++ b/arch/arm/mach-bcm/bcm_nsp.h
-@@ -0,0 +1,19 @@
-+/*
-+ * Copyright (C) 2015 Broadcom Corporation
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#ifndef __BCM_NSP_H
-+#define __BCM_NSP_H
-+
-+extern void nsp_secondary_startup(void);
-+
-+#endif /* __BCM_NSP_H */
---- /dev/null
-+++ b/arch/arm/mach-bcm/headsmp.S
-@@ -0,0 +1,37 @@
-+/*
-+ * Copyright (C) 2015 Broadcom Corporation
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#include <linux/linkage.h>
-+
-+/*
-+ * iProc specific entry point for secondary CPUs. This provides
-+ * a "holding pen" into which all secondary cores are held until
-+ * we are ready for them to initialise.
-+ */
-+ENTRY(nsp_secondary_startup)
-+ mrc p15, 0, r0, c0, c0, 5
-+ and r0, r0, #15
-+ adr r4, 1f
-+ ldmia r4, {r5, r6}
-+ sub r4, r4, r5
-+ add r6, r6, r4
-+pen: ldr r7, [r6]
-+ cmp r7, r0
-+ bne pen
-+
-+ b secondary_startup
-+
-+1: .long .
-+ .long pen_release
-+
-+ENDPROC(nsp_secondary_startup)
---- a/arch/arm/mach-bcm/kona_smp.c
-+++ /dev/null
-@@ -1,202 +0,0 @@
--/*
-- * Copyright (C) 2014 Broadcom Corporation
-- * Copyright 2014 Linaro Limited
-- *
-- * This program is free software; you can redistribute it and/or
-- * modify it under the terms of the GNU General Public License as
-- * published by the Free Software Foundation version 2.
-- *
-- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-- * kind, whether express or implied; without even the implied warranty
-- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- * GNU General Public License for more details.
-- */
--
--#include <linux/init.h>
--#include <linux/errno.h>
--#include <linux/io.h>
--#include <linux/of.h>
--#include <linux/sched.h>
--
--#include <asm/smp.h>
--#include <asm/smp_plat.h>
--#include <asm/smp_scu.h>
--
--/* Size of mapped Cortex A9 SCU address space */
--#define CORTEX_A9_SCU_SIZE 0x58
--
--#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
--#define BOOT_ADDR_CPUID_MASK 0x3
--
--/* Name of device node property defining secondary boot register location */
--#define OF_SECONDARY_BOOT "secondary-boot-reg"
--
--/* I/O address of register used to coordinate secondary core startup */
--static u32 secondary_boot;
--
--/*
-- * Enable the Cortex A9 Snoop Control Unit
-- *
-- * By the time this is called we already know there are multiple
-- * cores present. We assume we're running on a Cortex A9 processor,
-- * so any trouble getting the base address register or getting the
-- * SCU base is a problem.
-- *
-- * Return 0 if successful or an error code otherwise.
-- */
--static int __init scu_a9_enable(void)
--{
-- unsigned long config_base;
-- void __iomem *scu_base;
--
-- if (!scu_a9_has_base()) {
-- pr_err("no configuration base address register!\n");
-- return -ENXIO;
-- }
--
-- /* Config base address register value is zero for uniprocessor */
-- config_base = scu_a9_get_base();
-- if (!config_base) {
-- pr_err("hardware reports only one core\n");
-- return -ENOENT;
-- }
--
-- scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
-- if (!scu_base) {
-- pr_err("failed to remap config base (%lu/%u) for SCU\n",
-- config_base, CORTEX_A9_SCU_SIZE);
-- return -ENOMEM;
-- }
--
-- scu_enable(scu_base);
--
-- iounmap(scu_base); /* That's the last we'll need of this */
--
-- return 0;
--}
--
--static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
--{
-- static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
-- struct device_node *node;
-- 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;
-- }
--
-- /*
-- * 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);
-- 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);
-- }
--}
--
--/*
-- * The ROM code has the secondary cores looping, waiting for an event.
-- * When an event occurs each core examines the bottom two bits of the
-- * secondary boot register. When a core finds those bits contain its
-- * own core id, it performs initialization, including computing its boot
-- * address by clearing the boot register value's bottom two bits. The
-- * core signals that it is beginning its execution by writing its boot
-- * address back to the secondary boot register, and finally jumps to
-- * that address.
-- *
-- * So to start a core executing we need to:
-- * - Encode the (hardware) CPU id with the bottom bits of the secondary
-- * start address.
-- * - Write that value into the secondary boot register.
-- * - Generate an event to wake up the secondary CPU(s).
-- * - 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)
--{
-- void __iomem *boot_reg;
-- phys_addr_t boot_func;
-- u64 start_clock;
-- u32 cpu_id;
-- u32 boot_val;
-- bool timeout = false;
--
-- cpu_id = cpu_logical_map(cpu);
-- if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
-- pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
-- return -EINVAL;
-- }
--
-- if (!secondary_boot) {
-- pr_err("required secondary boot register not specified\n");
-- return -EINVAL;
-- }
--
-- boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
-- if (!boot_reg) {
-- pr_err("unable to map boot register for cpu %u\n", cpu_id);
-- return -ENOSYS;
-- }
--
-- /*
-- * Secondary cores will start in secondary_startup(),
-- * defined in "arch/arm/kernel/head.S"
-- */
-- boot_func = virt_to_phys(secondary_startup);
-- BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
-- BUG_ON(boot_func > (phys_addr_t)U32_MAX);
--
-- /* The core to start is encoded in the low bits */
-- boot_val = (u32)boot_func | cpu_id;
-- writel_relaxed(boot_val, boot_reg);
--
-- sev();
--
-- /* The low bits will be cleared once the core has started */
-- start_clock = local_clock();
-- while (!timeout && readl_relaxed(boot_reg) == boot_val)
-- timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
--
-- iounmap(boot_reg);
--
-- if (!timeout)
-- return 0;
--
-- pr_err("timeout waiting for cpu %u to start\n", cpu_id);
--
-- return -ENOSYS;
--}
--
--static struct smp_operations bcm_smp_ops __initdata = {
-- .smp_prepare_cpus = bcm_smp_prepare_cpus,
-- .smp_boot_secondary = bcm_boot_secondary,
--};
--CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
-- &bcm_smp_ops);
---- /dev/null
-+++ b/arch/arm/mach-bcm/platsmp.c
-@@ -0,0 +1,326 @@
-+/*
-+ * Copyright (C) 2014-2015 Broadcom Corporation
-+ * Copyright 2014 Linaro Limited
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#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>
-+
-+#include "bcm_nsp.h"
-+
-+/* Size of mapped Cortex A9 SCU address space */
-+#define CORTEX_A9_SCU_SIZE 0x58
-+
-+#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
-+#define BOOT_ADDR_CPUID_MASK 0x3
-+
-+/* Name of device node property defining secondary boot register location */
-+#define OF_SECONDARY_BOOT "secondary-boot-reg"
-+
-+/* I/O address of register used to coordinate secondary core startup */
-+static u32 secondary_boot;
-+
-+static DEFINE_SPINLOCK(boot_lock);
-+
-+/*
-+ * Write pen_release in a way that is guaranteed to be visible to all
-+ * observers, irrespective of whether they're taking part in coherency
-+ * or not. This is necessary for the hotplug code to work reliably.
-+ */
-+static void write_pen_release(int val)
-+{
-+ pen_release = val;
-+ /*
-+ * Ensure write to pen_release is visible to the other cores,
-+ * here - primary core
-+ */
-+ smp_wmb();
-+ sync_cache_w(&pen_release);
-+}
-+
-+/*
-+ * Enable the Cortex A9 Snoop Control Unit
-+ *
-+ * By the time this is called we already know there are multiple
-+ * cores present. We assume we're running on a Cortex A9 processor,
-+ * so any trouble getting the base address register or getting the
-+ * SCU base is a problem.
-+ *
-+ * Return 0 if successful or an error code otherwise.
-+ */
-+static int __init scu_a9_enable(void)
-+{
-+ unsigned long config_base;
-+ void __iomem *scu_base;
-+
-+ if (!scu_a9_has_base()) {
-+ pr_err("no configuration base address register!\n");
-+ return -ENXIO;
-+ }
-+
-+ /* Config base address register value is zero for uniprocessor */
-+ config_base = scu_a9_get_base();
-+ if (!config_base) {
-+ pr_err("hardware reports only one core\n");
-+ return -ENOENT;
-+ }
-+
-+ scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
-+ if (!scu_base) {
-+ pr_err("failed to remap config base (%lu/%u) for SCU\n",
-+ config_base, CORTEX_A9_SCU_SIZE);
-+ return -ENOMEM;
-+ }
-+
-+ scu_enable(scu_base);
-+
-+ iounmap(scu_base); /* That's the last we'll need of this */
-+
-+ return 0;
-+}
-+
-+static int nsp_write_lut(void (*secondary_startup) (void))
-+{
-+ void __iomem *sku_rom_lut;
-+ phys_addr_t secondary_startup_phy;
-+
-+ if (!secondary_boot) {
-+ pr_warn("required secondary boot register not specified\n");
-+ return -EINVAL;
-+ }
-+
-+ sku_rom_lut = ioremap_nocache((phys_addr_t)secondary_boot,
-+ sizeof(secondary_boot));
-+ 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 nsp_secondary_init(unsigned int cpu)
-+{
-+ /*
-+ * Let the primary cpu know we are out of holding pen.
-+ */
-+ write_pen_release(-1);
-+
-+ /*
-+ * Synchronise with the boot thread.
-+ */
-+ spin_lock(&boot_lock);
-+ spin_unlock(&boot_lock);
-+}
-+
-+static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
-+{
-+ static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
-+ struct device_node *node;
-+ 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 core. 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_warn("%s: missing/invalid " OF_SECONDARY_BOOT " property\n",
-+ node->name);
-+ ret = -ENOENT; /* Arrange to disable SMP */
-+ goto out;
-+ }
-+
-+ /*
-+ * 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);
-+ if (ret) {
-+ /* Update the CPU present map to reflect uniprocessor mode */
-+ pr_warn("disabling SMP\n");
-+ init_cpu_present(&only_cpu_0);
-+ }
-+}
-+
-+/*
-+ * The ROM code has the secondary cores looping, waiting for an event.
-+ * When an event occurs each core examines the bottom two bits of the
-+ * secondary boot register. When a core finds those bits contain its
-+ * own core id, it performs initialization, including computing its boot
-+ * address by clearing the boot register value's bottom two bits. The
-+ * core signals that it is beginning its execution by writing its boot
-+ * address back to the secondary boot register, and finally jumps to
-+ * that address.
-+ *
-+ * So to start a core executing we need to:
-+ * - Encode the (hardware) CPU id with the bottom bits of the secondary
-+ * start address.
-+ * - Write that value into the secondary boot register.
-+ * - Generate an event to wake up the secondary CPU(s).
-+ * - Wait for the secondary boot register to be re-written, which
-+ * indicates the secondary core has started.
-+ */
-+static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
-+{
-+ void __iomem *boot_reg;
-+ phys_addr_t boot_func;
-+ u64 start_clock;
-+ u32 cpu_id;
-+ u32 boot_val;
-+ bool timeout = false;
-+
-+ cpu_id = cpu_logical_map(cpu);
-+ if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
-+ pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
-+ return -EINVAL;
-+ }
-+
-+ if (!secondary_boot) {
-+ pr_err("required secondary boot register not specified\n");
-+ return -EINVAL;
-+ }
-+
-+ boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
-+ if (!boot_reg) {
-+ pr_err("unable to map boot register for cpu %u\n", cpu_id);
-+ return -ENOMEM;
-+ }
-+
-+ /*
-+ * Secondary cores will start in secondary_startup(),
-+ * defined in "arch/arm/kernel/head.S"
-+ */
-+ boot_func = virt_to_phys(secondary_startup);
-+ BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
-+ BUG_ON(boot_func > (phys_addr_t)U32_MAX);
-+
-+ /* The core to start is encoded in the low bits */
-+ boot_val = (u32)boot_func | cpu_id;
-+ writel_relaxed(boot_val, boot_reg);
-+
-+ sev();
-+
-+ /* The low bits will be cleared once the core has started */
-+ start_clock = local_clock();
-+ while (!timeout && readl_relaxed(boot_reg) == boot_val)
-+ timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
-+
-+ iounmap(boot_reg);
-+
-+ if (!timeout)
-+ return 0;
-+
-+ pr_err("timeout waiting for cpu %u to start\n", cpu_id);
-+
-+ return -ENXIO;
-+}
-+
-+static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)
-+{
-+ unsigned long timeout;
-+ int ret;
-+
-+ /*
-+ * After wake up, secondary core branches to the startup
-+ * address programmed at SKU ROM LUT location.
-+ */
-+ ret = nsp_write_lut(nsp_secondary_startup);
-+ if (ret) {
-+ pr_err("unable to write startup addr to SKU ROM LUT\n");
-+ goto out;
-+ }
-+
-+ /*
-+ * The secondary processor is waiting to be released from
-+ * the holding pen - release it, then wait for it to flag
-+ * that it has been released by resetting pen_release.
-+ */
-+ spin_lock(&boot_lock);
-+
-+ write_pen_release(cpu_logical_map(cpu));
-+ /*
-+ * Send an Event to wake up the secondary core which is in
-+ * WFE state. Updated pen_release should also be visible to
-+ * the secondary core.
-+ */
-+ dsb_sev();
-+
-+ timeout = jiffies + (1 * HZ);
-+ while (time_before(jiffies, timeout)) {
-+ /* Make sure loads on other CPU is visible */
-+ smp_rmb();
-+ if (pen_release == -1)
-+ break;
-+
-+ udelay(10);
-+ }
-+
-+ spin_unlock(&boot_lock);
-+
-+ ret = pen_release != -1 ? -ENXIO : 0;
-+
-+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_secondary_init = nsp_secondary_init,
-+ .smp_boot_secondary = nsp_boot_secondary,
-+};
-+CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);
--- /dev/null
+From 204b9dbd7c4bd5a223fd104b9cba56c12fe04add Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 19 Aug 2015 13:42:23 -0400
+Subject: [PATCH 130/134] dt-bindings: add SMP enable-method for Broadcom NSP
+
+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
+
+--- /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
++CPUs 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 "cpus" 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>;
++ enable-method = "brcm,bcm-nsp-smp";
++
++ 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>;
++ reg = <1>;
++ secondary-boot-reg = <0xffff042c>;
++ };
++ };
+--- a/Documentation/devicetree/bindings/arm/cpus.txt
++++ b/Documentation/devicetree/bindings/arm/cpus.txt
+@@ -189,6 +189,7 @@ nodes to be present and contain the prop
+ can be one of:
+ "allwinner,sun6i-a31"
+ "arm,psci"
++ "brcm,bcm-nsp-smp"
+ "brcm,brahma-b15"
+ "marvell,armada-375-smp"
+ "marvell,armada-380-smp"
+++ /dev/null
-From ddbf0ad85be06948dd214c7beb7b315ef2749e65 Mon Sep 17 00:00:00 2001
-From: Jon Mason <jonmason@broadcom.com>
-Date: Thu, 15 Oct 2015 14:14:10 -0400
-Subject: [PATCH] ARM: BCM: Add SMP support for Broadcom 4708
-
-ARM: BCM: Add SMP support for Broadcom 4708
-
-Add SMP support for Broadcom's 4708 SoCs.
-
-Signed-off-by: Jon Mason <jonmason@broadcom.com>
----
- arch/arm/boot/dts/bcm4708.dtsi | 2 ++
- arch/arm/mach-bcm/Kconfig | 2 ++
- arch/arm/mach-bcm/Makefile | 3 +++
- 3 files changed, 7 insertions(+)
-
---- a/arch/arm/boot/dts/bcm4708.dtsi
-+++ b/arch/arm/boot/dts/bcm4708.dtsi
-@@ -15,6 +15,8 @@
- cpus {
- #address-cells = <1>;
- #size-cells = <0>;
-+ enable-method = "brcm,bcm-nsp-smp";
-+ secondary-boot-reg = <0xffff0400>;
-
- cpu@0 {
- device_type = "cpu";
---- a/arch/arm/mach-bcm/Kconfig
-+++ b/arch/arm/mach-bcm/Kconfig
-@@ -41,6 +41,7 @@ config ARCH_BCM_5301X
- select ARM_ERRATA_754322
- select ARM_ERRATA_775420
- select ARM_ERRATA_764369 if SMP
-+ select HAVE_SMP
-
- help
- Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
---- a/arch/arm/mach-bcm/Makefile
-+++ b/arch/arm/mach-bcm/Makefile
-@@ -36,6 +36,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2
-
- # BCM5301X
- obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
-+ifeq ($(CONFIG_ARCH_BCM_5301X),y)
-+obj-$(CONFIG_SMP) += headsmp.o platsmp.o
-+endif
-
- # BCM63XXx
- obj-$(CONFIG_ARCH_BCM_63XX) := bcm63xx.o
--- /dev/null
+From 8622d6da5d95293d474c156612fd819fdaf542ec Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 25 Nov 2015 08:58:53 -0500
+Subject: [PATCH 131/134] ARM: BCM: Clean up SMP support for Broadcom Kona
+
+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>
+---
+ arch/arm/boot/dts/bcm11351.dtsi | 2 +-
+ arch/arm/boot/dts/bcm21664.dtsi | 2 +-
+ arch/arm/mach-bcm/kona_smp.c | 82 +++++++++++++++++++++++++++--------------
+ 3 files changed, 56 insertions(+), 30 deletions(-)
+
+--- a/arch/arm/boot/dts/bcm11351.dtsi
++++ b/arch/arm/boot/dts/bcm11351.dtsi
+@@ -31,7 +31,6 @@
+ #address-cells = <1>;
+ #size-cells = <0>;
+ enable-method = "brcm,bcm11351-cpu-method";
+- secondary-boot-reg = <0x3500417c>;
+
+ cpu0: cpu@0 {
+ device_type = "cpu";
+@@ -42,6 +41,7 @@
+ cpu1: cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
++ secondary-boot-reg = <0x3500417c>;
+ reg = <1>;
+ };
+ };
+--- a/arch/arm/boot/dts/bcm21664.dtsi
++++ b/arch/arm/boot/dts/bcm21664.dtsi
+@@ -31,7 +31,6 @@
+ #address-cells = <1>;
+ #size-cells = <0>;
+ enable-method = "brcm,bcm11351-cpu-method";
+- secondary-boot-reg = <0x35004178>;
+
+ cpu0: cpu@0 {
+ device_type = "cpu";
+@@ -42,6 +41,7 @@
+ cpu1: cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
++ secondary-boot-reg = <0x35004178>;
+ reg = <1>;
+ };
+ };
+--- 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 i
+ 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 i
+
+ 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);
--- /dev/null
+From e99fb6d01cddf38cffc11655aba4a96a981d604e Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 25 Nov 2015 13:25:55 -0500
+Subject: [PATCH 133/134] 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>
+---
+ arch/arm/mach-bcm/Kconfig | 2 +
+ arch/arm/mach-bcm/Makefile | 8 +-
+ arch/arm/mach-bcm/kona_smp.c | 228 ----------------------------------
+ arch/arm/mach-bcm/platsmp.c | 290 +++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 298 insertions(+), 230 deletions(-)
+ delete mode 100644 arch/arm/mach-bcm/kona_smp.c
+ create mode 100644 arch/arm/mach-bcm/platsmp.c
+
+--- a/arch/arm/mach-bcm/Makefile
++++ b/arch/arm/mach-bcm/Makefile
+@@ -20,7 +20,7 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bc
+ obj-$(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
+--- a/arch/arm/mach-bcm/kona_smp.c
++++ /dev/null
+@@ -1,228 +0,0 @@
+-/*
+- * Copyright (C) 2014-2015 Broadcom Corporation
+- * Copyright 2014 Linaro Limited
+- *
+- * This program is free software; you can redistribute it and/or
+- * modify it under the terms of the GNU General Public License as
+- * published by the Free Software Foundation version 2.
+- *
+- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+- * kind, whether express or implied; without even the implied warranty
+- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+- * GNU General Public License for more details.
+- */
+-
+-#include <linux/init.h>
+-#include <linux/errno.h>
+-#include <linux/io.h>
+-#include <linux/of.h>
+-#include <linux/sched.h>
+-
+-#include <asm/smp.h>
+-#include <asm/smp_plat.h>
+-#include <asm/smp_scu.h>
+-
+-/* Size of mapped Cortex A9 SCU address space */
+-#define CORTEX_A9_SCU_SIZE 0x58
+-
+-#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
+-#define BOOT_ADDR_CPUID_MASK 0x3
+-
+-/* 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_addr;
+-
+-/*
+- * Enable the Cortex A9 Snoop Control Unit
+- *
+- * By the time this is called we already know there are multiple
+- * cores present. We assume we're running on a Cortex A9 processor,
+- * so any trouble getting the base address register or getting the
+- * SCU base is a problem.
+- *
+- * Return 0 if successful or an error code otherwise.
+- */
+-static int __init scu_a9_enable(void)
+-{
+- unsigned long config_base;
+- void __iomem *scu_base;
+-
+- if (!scu_a9_has_base()) {
+- pr_err("no configuration base address register!\n");
+- return -ENXIO;
+- }
+-
+- /* Config base address register value is zero for uniprocessor */
+- config_base = scu_a9_get_base();
+- if (!config_base) {
+- pr_err("hardware reports only one core\n");
+- return -ENOENT;
+- }
+-
+- scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
+- if (!scu_base) {
+- pr_err("failed to remap config base (%lu/%u) for SCU\n",
+- config_base, CORTEX_A9_SCU_SIZE);
+- return -ENOMEM;
+- }
+-
+- scu_enable(scu_base);
+-
+- iounmap(scu_base); /* That's the last we'll need of this */
+-
+- return 0;
+-}
+-
+-static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
+-{
+- static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
+- struct device_node *cpus_node = NULL;
+- struct device_node *cpu_node = NULL;
+- int ret;
+-
+- /*
+- * 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.
+- */
+- 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
+- * returned, the SoC reported a uniprocessor configuration.
+- * We bail on any other error.
+- */
+- ret = scu_a9_enable();
+-out:
+- of_node_put(cpu_node);
+- of_node_put(cpus_node);
+-
+- if (ret) {
+- /* Update the CPU present map to reflect uniprocessor mode */
+- pr_warn("disabling SMP\n");
+- init_cpu_present(&only_cpu_0);
+- }
+-}
+-
+-/*
+- * The ROM code has the secondary cores looping, waiting for an event.
+- * When an event occurs each core examines the bottom two bits of the
+- * secondary boot register. When a core finds those bits contain its
+- * own core id, it performs initialization, including computing its boot
+- * address by clearing the boot register value's bottom two bits. The
+- * core signals that it is beginning its execution by writing its boot
+- * address back to the secondary boot register, and finally jumps to
+- * that address.
+- *
+- * So to start a core executing we need to:
+- * - Encode the (hardware) CPU id with the bottom bits of the secondary
+- * start address.
+- * - Write that value into the secondary boot register.
+- * - Generate an event to wake up the secondary CPU(s).
+- * - Wait for the secondary boot register to be re-written, which
+- * indicates the secondary core has started.
+- */
+-static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
+-{
+- void __iomem *boot_reg;
+- phys_addr_t boot_func;
+- u64 start_clock;
+- u32 cpu_id;
+- u32 boot_val;
+- bool timeout = false;
+-
+- cpu_id = cpu_logical_map(cpu);
+- if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
+- pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
+- return -EINVAL;
+- }
+-
+- if (!secondary_boot_addr) {
+- pr_err("required secondary boot register not specified\n");
+- return -EINVAL;
+- }
+-
+- 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 -ENOMEM;
+- }
+-
+- /*
+- * Secondary cores will start in secondary_startup(),
+- * defined in "arch/arm/kernel/head.S"
+- */
+- boot_func = virt_to_phys(secondary_startup);
+- BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
+- BUG_ON(boot_func > (phys_addr_t)U32_MAX);
+-
+- /* The core to start is encoded in the low bits */
+- boot_val = (u32)boot_func | cpu_id;
+- writel_relaxed(boot_val, boot_reg);
+-
+- sev();
+-
+- /* The low bits will be cleared once the core has started */
+- start_clock = local_clock();
+- while (!timeout && readl_relaxed(boot_reg) == boot_val)
+- timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
+-
+- iounmap(boot_reg);
+-
+- if (!timeout)
+- return 0;
+-
+- pr_err("timeout waiting for cpu %u to start\n", cpu_id);
+-
+- return -ENXIO;
+-}
+-
+-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);
+--- /dev/null
++++ b/arch/arm/mach-bcm/platsmp.c
+@@ -0,0 +1,290 @@
++/*
++ * Copyright (C) 2014-2015 Broadcom Corporation
++ * Copyright 2014 Linaro Limited
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation version 2.
++ *
++ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
++ * kind, whether express or implied; without even the implied warranty
++ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#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>
++
++/* Size of mapped Cortex A9 SCU address space */
++#define CORTEX_A9_SCU_SIZE 0x58
++
++#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
++#define BOOT_ADDR_CPUID_MASK 0x3
++
++/* 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_addr;
++
++/*
++ * Enable the Cortex A9 Snoop Control Unit
++ *
++ * By the time this is called we already know there are multiple
++ * cores present. We assume we're running on a Cortex A9 processor,
++ * so any trouble getting the base address register or getting the
++ * SCU base is a problem.
++ *
++ * Return 0 if successful or an error code otherwise.
++ */
++static int __init scu_a9_enable(void)
++{
++ unsigned long config_base;
++ void __iomem *scu_base;
++
++ if (!scu_a9_has_base()) {
++ pr_err("no configuration base address register!\n");
++ return -ENXIO;
++ }
++
++ /* Config base address register value is zero for uniprocessor */
++ config_base = scu_a9_get_base();
++ if (!config_base) {
++ pr_err("hardware reports only one core\n");
++ return -ENOENT;
++ }
++
++ scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
++ if (!scu_base) {
++ pr_err("failed to remap config base (%lu/%u) for SCU\n",
++ config_base, CORTEX_A9_SCU_SIZE);
++ return -ENOMEM;
++ }
++
++ scu_enable(scu_base);
++
++ iounmap(scu_base); /* That's the last we'll need of this */
++
++ 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 };
++ struct device_node *cpus_node = NULL;
++ struct device_node *cpu_node = NULL;
++ int ret;
++
++ /*
++ * 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.
++ */
++ 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
++ * returned, the SoC reported a uniprocessor configuration.
++ * We bail on any other error.
++ */
++ ret = scu_a9_enable();
++out:
++ of_node_put(cpu_node);
++ of_node_put(cpus_node);
++
++ if (ret) {
++ /* Update the CPU present map to reflect uniprocessor mode */
++ pr_warn("disabling SMP\n");
++ init_cpu_present(&only_cpu_0);
++ }
++}
++
++/*
++ * The ROM code has the secondary cores looping, waiting for an event.
++ * When an event occurs each core examines the bottom two bits of the
++ * secondary boot register. When a core finds those bits contain its
++ * own core id, it performs initialization, including computing its boot
++ * address by clearing the boot register value's bottom two bits. The
++ * core signals that it is beginning its execution by writing its boot
++ * address back to the secondary boot register, and finally jumps to
++ * that address.
++ *
++ * So to start a core executing we need to:
++ * - Encode the (hardware) CPU id with the bottom bits of the secondary
++ * start address.
++ * - Write that value into the secondary boot register.
++ * - Generate an event to wake up the secondary CPU(s).
++ * - Wait for the secondary boot register to be re-written, which
++ * indicates the secondary core has started.
++ */
++static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
++{
++ void __iomem *boot_reg;
++ phys_addr_t boot_func;
++ u64 start_clock;
++ u32 cpu_id;
++ u32 boot_val;
++ bool timeout = false;
++
++ cpu_id = cpu_logical_map(cpu);
++ if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
++ pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
++ return -EINVAL;
++ }
++
++ if (!secondary_boot_addr) {
++ pr_err("required secondary boot register not specified\n");
++ return -EINVAL;
++ }
++
++ 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 -ENOMEM;
++ }
++
++ /*
++ * Secondary cores will start in secondary_startup(),
++ * defined in "arch/arm/kernel/head.S"
++ */
++ boot_func = virt_to_phys(secondary_startup);
++ BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
++ BUG_ON(boot_func > (phys_addr_t)U32_MAX);
++
++ /* The core to start is encoded in the low bits */
++ boot_val = (u32)boot_func | cpu_id;
++ writel_relaxed(boot_val, boot_reg);
++
++ sev();
++
++ /* The low bits will be cleared once the core has started */
++ start_clock = local_clock();
++ while (!timeout && readl_relaxed(boot_reg) == boot_val)
++ timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
++
++ iounmap(boot_reg);
++
++ if (!timeout)
++ return 0;
++
++ pr_err("timeout waiting for cpu %u to start\n", cpu_id);
++
++ 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);
--- /dev/null
+From 16e1bf7dde22ee22a331aabf824cc31a6794a4cb Mon Sep 17 00:00:00 2001
+From: Jon Mason <jonmason@broadcom.com>
+Date: Thu, 15 Oct 2015 14:09:10 -0400
+Subject: [PATCH 134/134] ARM: BCM: Add SMP support for Broadcom 4708
+
+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 | 2 ++
+ arch/arm/mach-bcm/Kconfig | 1 +
+ arch/arm/mach-bcm/Makefile | 3 +++
+ 3 files changed, 6 insertions(+)
+
+--- a/arch/arm/boot/dts/bcm4708.dtsi
++++ b/arch/arm/boot/dts/bcm4708.dtsi
+@@ -15,6 +15,7 @@
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
++ enable-method = "brcm,bcm-nsp-smp";
+
+ cpu@0 {
+ device_type = "cpu";
+@@ -27,6 +28,7 @@
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
+ next-level-cache = <&L2>;
++ secondary-boot-reg = <0xffff0400>;
+ reg = <0x1>;
+ };
+ };
+--- a/arch/arm/mach-bcm/Kconfig
++++ b/arch/arm/mach-bcm/Kconfig
+@@ -41,6 +41,7 @@ config ARCH_BCM_5301X
+ select ARM_ERRATA_754322
+ select ARM_ERRATA_775420
+ select ARM_ERRATA_764369 if SMP
++ select HAVE_SMP
+
+ help
+ Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
+--- a/arch/arm/mach-bcm/Makefile
++++ b/arch/arm/mach-bcm/Makefile
+@@ -36,6 +36,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2
+
+ # BCM5301X
+ obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
++ifeq ($(CONFIG_ARCH_BCM_5301X),y)
++obj-$(CONFIG_SMP) += platsmp.o
++endif
+
+ # BCM63XXx
+ obj-$(CONFIG_ARCH_BCM_63XX) := bcm63xx.o
+++ /dev/null
-From a0ad1511d5805b95ac4c454d7904c670a1696055 Mon Sep 17 00:00:00 2001
-From: Kapil Hali <kapilh@broadcom.com>
-Date: Wed, 14 Oct 2015 13:47:00 -0400
-Subject: [PATCH] ARM: BCM: Add SMP support for Broadcom NSP
-
-Add SMP support for Broadcom's Northstar Plus SoC,
-cpu enable method and pen_release procedures. This
-changes also consolidates iProc family's - BCM NSP
-and BCM Kona, 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/Makefile | 2 +-
- arch/arm/mach-bcm/bcm_nsp.h | 19 +++
- arch/arm/mach-bcm/headsmp.S | 37 +++++
- arch/arm/mach-bcm/kona_smp.c | 202 ---------------------------
- arch/arm/mach-bcm/platsmp.c | 326 +++++++++++++++++++++++++++++++++++++++++++
- 5 files changed, 383 insertions(+), 203 deletions(-)
- create mode 100644 arch/arm/mach-bcm/bcm_nsp.h
- create mode 100644 arch/arm/mach-bcm/headsmp.S
- delete mode 100644 arch/arm/mach-bcm/kona_smp.c
- create mode 100644 arch/arm/mach-bcm/platsmp.c
-
---- a/arch/arm/mach-bcm/Makefile
-+++ b/arch/arm/mach-bcm/Makefile
-@@ -20,7 +20,7 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bc
- obj-$(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
---- /dev/null
-+++ b/arch/arm/mach-bcm/bcm_nsp.h
-@@ -0,0 +1,19 @@
-+/*
-+ * Copyright (C) 2015 Broadcom Corporation
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#ifndef __BCM_NSP_H
-+#define __BCM_NSP_H
-+
-+extern void nsp_secondary_startup(void);
-+
-+#endif /* __BCM_NSP_H */
---- /dev/null
-+++ b/arch/arm/mach-bcm/headsmp.S
-@@ -0,0 +1,37 @@
-+/*
-+ * Copyright (C) 2015 Broadcom Corporation
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#include <linux/linkage.h>
-+
-+/*
-+ * iProc specific entry point for secondary CPUs. This provides
-+ * a "holding pen" into which all secondary cores are held until
-+ * we are ready for them to initialise.
-+ */
-+ENTRY(nsp_secondary_startup)
-+ mrc p15, 0, r0, c0, c0, 5
-+ and r0, r0, #15
-+ adr r4, 1f
-+ ldmia r4, {r5, r6}
-+ sub r4, r4, r5
-+ add r6, r6, r4
-+pen: ldr r7, [r6]
-+ cmp r7, r0
-+ bne pen
-+
-+ b secondary_startup
-+
-+1: .long .
-+ .long pen_release
-+
-+ENDPROC(nsp_secondary_startup)
---- a/arch/arm/mach-bcm/kona_smp.c
-+++ /dev/null
-@@ -1,202 +0,0 @@
--/*
-- * Copyright (C) 2014 Broadcom Corporation
-- * Copyright 2014 Linaro Limited
-- *
-- * This program is free software; you can redistribute it and/or
-- * modify it under the terms of the GNU General Public License as
-- * published by the Free Software Foundation version 2.
-- *
-- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-- * kind, whether express or implied; without even the implied warranty
-- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- * GNU General Public License for more details.
-- */
--
--#include <linux/init.h>
--#include <linux/errno.h>
--#include <linux/io.h>
--#include <linux/of.h>
--#include <linux/sched.h>
--
--#include <asm/smp.h>
--#include <asm/smp_plat.h>
--#include <asm/smp_scu.h>
--
--/* Size of mapped Cortex A9 SCU address space */
--#define CORTEX_A9_SCU_SIZE 0x58
--
--#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
--#define BOOT_ADDR_CPUID_MASK 0x3
--
--/* Name of device node property defining secondary boot register location */
--#define OF_SECONDARY_BOOT "secondary-boot-reg"
--
--/* I/O address of register used to coordinate secondary core startup */
--static u32 secondary_boot;
--
--/*
-- * Enable the Cortex A9 Snoop Control Unit
-- *
-- * By the time this is called we already know there are multiple
-- * cores present. We assume we're running on a Cortex A9 processor,
-- * so any trouble getting the base address register or getting the
-- * SCU base is a problem.
-- *
-- * Return 0 if successful or an error code otherwise.
-- */
--static int __init scu_a9_enable(void)
--{
-- unsigned long config_base;
-- void __iomem *scu_base;
--
-- if (!scu_a9_has_base()) {
-- pr_err("no configuration base address register!\n");
-- return -ENXIO;
-- }
--
-- /* Config base address register value is zero for uniprocessor */
-- config_base = scu_a9_get_base();
-- if (!config_base) {
-- pr_err("hardware reports only one core\n");
-- return -ENOENT;
-- }
--
-- scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
-- if (!scu_base) {
-- pr_err("failed to remap config base (%lu/%u) for SCU\n",
-- config_base, CORTEX_A9_SCU_SIZE);
-- return -ENOMEM;
-- }
--
-- scu_enable(scu_base);
--
-- iounmap(scu_base); /* That's the last we'll need of this */
--
-- return 0;
--}
--
--static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
--{
-- static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
-- struct device_node *node;
-- 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;
-- }
--
-- /*
-- * 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);
-- 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);
-- }
--}
--
--/*
-- * The ROM code has the secondary cores looping, waiting for an event.
-- * When an event occurs each core examines the bottom two bits of the
-- * secondary boot register. When a core finds those bits contain its
-- * own core id, it performs initialization, including computing its boot
-- * address by clearing the boot register value's bottom two bits. The
-- * core signals that it is beginning its execution by writing its boot
-- * address back to the secondary boot register, and finally jumps to
-- * that address.
-- *
-- * So to start a core executing we need to:
-- * - Encode the (hardware) CPU id with the bottom bits of the secondary
-- * start address.
-- * - Write that value into the secondary boot register.
-- * - Generate an event to wake up the secondary CPU(s).
-- * - 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)
--{
-- void __iomem *boot_reg;
-- phys_addr_t boot_func;
-- u64 start_clock;
-- u32 cpu_id;
-- u32 boot_val;
-- bool timeout = false;
--
-- cpu_id = cpu_logical_map(cpu);
-- if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
-- pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
-- return -EINVAL;
-- }
--
-- if (!secondary_boot) {
-- pr_err("required secondary boot register not specified\n");
-- return -EINVAL;
-- }
--
-- boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
-- if (!boot_reg) {
-- pr_err("unable to map boot register for cpu %u\n", cpu_id);
-- return -ENOSYS;
-- }
--
-- /*
-- * Secondary cores will start in secondary_startup(),
-- * defined in "arch/arm/kernel/head.S"
-- */
-- boot_func = virt_to_phys(secondary_startup);
-- BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
-- BUG_ON(boot_func > (phys_addr_t)U32_MAX);
--
-- /* The core to start is encoded in the low bits */
-- boot_val = (u32)boot_func | cpu_id;
-- writel_relaxed(boot_val, boot_reg);
--
-- sev();
--
-- /* The low bits will be cleared once the core has started */
-- start_clock = local_clock();
-- while (!timeout && readl_relaxed(boot_reg) == boot_val)
-- timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
--
-- iounmap(boot_reg);
--
-- if (!timeout)
-- return 0;
--
-- pr_err("timeout waiting for cpu %u to start\n", cpu_id);
--
-- return -ENOSYS;
--}
--
--static struct smp_operations bcm_smp_ops __initdata = {
-- .smp_prepare_cpus = bcm_smp_prepare_cpus,
-- .smp_boot_secondary = bcm_boot_secondary,
--};
--CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
-- &bcm_smp_ops);
---- /dev/null
-+++ b/arch/arm/mach-bcm/platsmp.c
-@@ -0,0 +1,326 @@
-+/*
-+ * Copyright (C) 2014-2015 Broadcom Corporation
-+ * Copyright 2014 Linaro Limited
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License as
-+ * published by the Free Software Foundation version 2.
-+ *
-+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
-+ * kind, whether express or implied; without even the implied warranty
-+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#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>
-+
-+#include "bcm_nsp.h"
-+
-+/* Size of mapped Cortex A9 SCU address space */
-+#define CORTEX_A9_SCU_SIZE 0x58
-+
-+#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
-+#define BOOT_ADDR_CPUID_MASK 0x3
-+
-+/* Name of device node property defining secondary boot register location */
-+#define OF_SECONDARY_BOOT "secondary-boot-reg"
-+
-+/* I/O address of register used to coordinate secondary core startup */
-+static u32 secondary_boot;
-+
-+static DEFINE_SPINLOCK(boot_lock);
-+
-+/*
-+ * Write pen_release in a way that is guaranteed to be visible to all
-+ * observers, irrespective of whether they're taking part in coherency
-+ * or not. This is necessary for the hotplug code to work reliably.
-+ */
-+static void write_pen_release(int val)
-+{
-+ pen_release = val;
-+ /*
-+ * Ensure write to pen_release is visible to the other cores,
-+ * here - primary core
-+ */
-+ smp_wmb();
-+ sync_cache_w(&pen_release);
-+}
-+
-+/*
-+ * Enable the Cortex A9 Snoop Control Unit
-+ *
-+ * By the time this is called we already know there are multiple
-+ * cores present. We assume we're running on a Cortex A9 processor,
-+ * so any trouble getting the base address register or getting the
-+ * SCU base is a problem.
-+ *
-+ * Return 0 if successful or an error code otherwise.
-+ */
-+static int __init scu_a9_enable(void)
-+{
-+ unsigned long config_base;
-+ void __iomem *scu_base;
-+
-+ if (!scu_a9_has_base()) {
-+ pr_err("no configuration base address register!\n");
-+ return -ENXIO;
-+ }
-+
-+ /* Config base address register value is zero for uniprocessor */
-+ config_base = scu_a9_get_base();
-+ if (!config_base) {
-+ pr_err("hardware reports only one core\n");
-+ return -ENOENT;
-+ }
-+
-+ scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
-+ if (!scu_base) {
-+ pr_err("failed to remap config base (%lu/%u) for SCU\n",
-+ config_base, CORTEX_A9_SCU_SIZE);
-+ return -ENOMEM;
-+ }
-+
-+ scu_enable(scu_base);
-+
-+ iounmap(scu_base); /* That's the last we'll need of this */
-+
-+ return 0;
-+}
-+
-+static int nsp_write_lut(void (*secondary_startup) (void))
-+{
-+ void __iomem *sku_rom_lut;
-+ phys_addr_t secondary_startup_phy;
-+
-+ if (!secondary_boot) {
-+ pr_warn("required secondary boot register not specified\n");
-+ return -EINVAL;
-+ }
-+
-+ sku_rom_lut = ioremap_nocache((phys_addr_t)secondary_boot,
-+ sizeof(secondary_boot));
-+ 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 nsp_secondary_init(unsigned int cpu)
-+{
-+ /*
-+ * Let the primary cpu know we are out of holding pen.
-+ */
-+ write_pen_release(-1);
-+
-+ /*
-+ * Synchronise with the boot thread.
-+ */
-+ spin_lock(&boot_lock);
-+ spin_unlock(&boot_lock);
-+}
-+
-+static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
-+{
-+ static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
-+ struct device_node *node;
-+ 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 core. 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_warn("%s: missing/invalid " OF_SECONDARY_BOOT " property\n",
-+ node->name);
-+ ret = -ENOENT; /* Arrange to disable SMP */
-+ goto out;
-+ }
-+
-+ /*
-+ * 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);
-+ if (ret) {
-+ /* Update the CPU present map to reflect uniprocessor mode */
-+ pr_warn("disabling SMP\n");
-+ init_cpu_present(&only_cpu_0);
-+ }
-+}
-+
-+/*
-+ * The ROM code has the secondary cores looping, waiting for an event.
-+ * When an event occurs each core examines the bottom two bits of the
-+ * secondary boot register. When a core finds those bits contain its
-+ * own core id, it performs initialization, including computing its boot
-+ * address by clearing the boot register value's bottom two bits. The
-+ * core signals that it is beginning its execution by writing its boot
-+ * address back to the secondary boot register, and finally jumps to
-+ * that address.
-+ *
-+ * So to start a core executing we need to:
-+ * - Encode the (hardware) CPU id with the bottom bits of the secondary
-+ * start address.
-+ * - Write that value into the secondary boot register.
-+ * - Generate an event to wake up the secondary CPU(s).
-+ * - Wait for the secondary boot register to be re-written, which
-+ * indicates the secondary core has started.
-+ */
-+static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
-+{
-+ void __iomem *boot_reg;
-+ phys_addr_t boot_func;
-+ u64 start_clock;
-+ u32 cpu_id;
-+ u32 boot_val;
-+ bool timeout = false;
-+
-+ cpu_id = cpu_logical_map(cpu);
-+ if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
-+ pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
-+ return -EINVAL;
-+ }
-+
-+ if (!secondary_boot) {
-+ pr_err("required secondary boot register not specified\n");
-+ return -EINVAL;
-+ }
-+
-+ boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
-+ if (!boot_reg) {
-+ pr_err("unable to map boot register for cpu %u\n", cpu_id);
-+ return -ENOMEM;
-+ }
-+
-+ /*
-+ * Secondary cores will start in secondary_startup(),
-+ * defined in "arch/arm/kernel/head.S"
-+ */
-+ boot_func = virt_to_phys(secondary_startup);
-+ BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
-+ BUG_ON(boot_func > (phys_addr_t)U32_MAX);
-+
-+ /* The core to start is encoded in the low bits */
-+ boot_val = (u32)boot_func | cpu_id;
-+ writel_relaxed(boot_val, boot_reg);
-+
-+ sev();
-+
-+ /* The low bits will be cleared once the core has started */
-+ start_clock = local_clock();
-+ while (!timeout && readl_relaxed(boot_reg) == boot_val)
-+ timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
-+
-+ iounmap(boot_reg);
-+
-+ if (!timeout)
-+ return 0;
-+
-+ pr_err("timeout waiting for cpu %u to start\n", cpu_id);
-+
-+ return -ENXIO;
-+}
-+
-+static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)
-+{
-+ unsigned long timeout;
-+ int ret;
-+
-+ /*
-+ * After wake up, secondary core branches to the startup
-+ * address programmed at SKU ROM LUT location.
-+ */
-+ ret = nsp_write_lut(nsp_secondary_startup);
-+ if (ret) {
-+ pr_err("unable to write startup addr to SKU ROM LUT\n");
-+ goto out;
-+ }
-+
-+ /*
-+ * The secondary processor is waiting to be released from
-+ * the holding pen - release it, then wait for it to flag
-+ * that it has been released by resetting pen_release.
-+ */
-+ spin_lock(&boot_lock);
-+
-+ write_pen_release(cpu_logical_map(cpu));
-+ /*
-+ * Send an Event to wake up the secondary core which is in
-+ * WFE state. Updated pen_release should also be visible to
-+ * the secondary core.
-+ */
-+ dsb_sev();
-+
-+ timeout = jiffies + (1 * HZ);
-+ while (time_before(jiffies, timeout)) {
-+ /* Make sure loads on other CPU is visible */
-+ smp_rmb();
-+ if (pen_release == -1)
-+ break;
-+
-+ udelay(10);
-+ }
-+
-+ spin_unlock(&boot_lock);
-+
-+ ret = pen_release != -1 ? -ENXIO : 0;
-+
-+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_secondary_init = nsp_secondary_init,
-+ .smp_boot_secondary = nsp_boot_secondary,
-+};
-+CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);
--- /dev/null
+From 204b9dbd7c4bd5a223fd104b9cba56c12fe04add Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 19 Aug 2015 13:42:23 -0400
+Subject: [PATCH 130/134] dt-bindings: add SMP enable-method for Broadcom NSP
+
+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
+
+--- /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
++CPUs 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 "cpus" 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>;
++ enable-method = "brcm,bcm-nsp-smp";
++
++ 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>;
++ reg = <1>;
++ secondary-boot-reg = <0xffff042c>;
++ };
++ };
+--- 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 prop
+ "allwinner,sun6i-a31"
+ "allwinner,sun8i-a23"
+ "arm,psci"
++ "brcm,bcm-nsp-smp"
+ "brcm,brahma-b15"
+ "marvell,armada-375-smp"
+ "marvell,armada-380-smp"
+++ /dev/null
-From ddbf0ad85be06948dd214c7beb7b315ef2749e65 Mon Sep 17 00:00:00 2001
-From: Jon Mason <jonmason@broadcom.com>
-Date: Thu, 15 Oct 2015 14:14:10 -0400
-Subject: [PATCH] ARM: BCM: Add SMP support for Broadcom 4708
-
-ARM: BCM: Add SMP support for Broadcom 4708
-
-Add SMP support for Broadcom's 4708 SoCs.
-
-Signed-off-by: Jon Mason <jonmason@broadcom.com>
----
- arch/arm/boot/dts/bcm4708.dtsi | 2 ++
- arch/arm/mach-bcm/Kconfig | 2 ++
- arch/arm/mach-bcm/Makefile | 3 +++
- 3 files changed, 7 insertions(+)
-
---- a/arch/arm/boot/dts/bcm4708.dtsi
-+++ b/arch/arm/boot/dts/bcm4708.dtsi
-@@ -15,6 +15,8 @@
- cpus {
- #address-cells = <1>;
- #size-cells = <0>;
-+ enable-method = "brcm,bcm-nsp-smp";
-+ secondary-boot-reg = <0xffff0400>;
-
- cpu@0 {
- device_type = "cpu";
---- a/arch/arm/mach-bcm/Kconfig
-+++ b/arch/arm/mach-bcm/Kconfig
-@@ -41,6 +41,7 @@ config ARCH_BCM_5301X
- select ARM_ERRATA_754322
- select ARM_ERRATA_775420
- select ARM_ERRATA_764369 if SMP
-+ select HAVE_SMP
-
- help
- Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
---- a/arch/arm/mach-bcm/Makefile
-+++ b/arch/arm/mach-bcm/Makefile
-@@ -36,6 +36,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2
-
- # BCM5301X
- obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
-+ifeq ($(CONFIG_ARCH_BCM_5301X),y)
-+obj-$(CONFIG_SMP) += headsmp.o platsmp.o
-+endif
-
- # BCM63XXx
- ifeq ($(CONFIG_ARCH_BCM_63XX),y)
--- /dev/null
+From 8622d6da5d95293d474c156612fd819fdaf542ec Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 25 Nov 2015 08:58:53 -0500
+Subject: [PATCH 131/134] ARM: BCM: Clean up SMP support for Broadcom Kona
+
+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>
+---
+ arch/arm/boot/dts/bcm11351.dtsi | 2 +-
+ arch/arm/boot/dts/bcm21664.dtsi | 2 +-
+ arch/arm/mach-bcm/kona_smp.c | 82 +++++++++++++++++++++++++++--------------
+ 3 files changed, 56 insertions(+), 30 deletions(-)
+
+--- a/arch/arm/boot/dts/bcm11351.dtsi
++++ b/arch/arm/boot/dts/bcm11351.dtsi
+@@ -31,7 +31,6 @@
+ #address-cells = <1>;
+ #size-cells = <0>;
+ enable-method = "brcm,bcm11351-cpu-method";
+- secondary-boot-reg = <0x3500417c>;
+
+ cpu0: cpu@0 {
+ device_type = "cpu";
+@@ -42,6 +41,7 @@
+ cpu1: cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
++ secondary-boot-reg = <0x3500417c>;
+ reg = <1>;
+ };
+ };
+--- a/arch/arm/boot/dts/bcm21664.dtsi
++++ b/arch/arm/boot/dts/bcm21664.dtsi
+@@ -31,7 +31,6 @@
+ #address-cells = <1>;
+ #size-cells = <0>;
+ enable-method = "brcm,bcm11351-cpu-method";
+- secondary-boot-reg = <0x35004178>;
+
+ cpu0: cpu@0 {
+ device_type = "cpu";
+@@ -42,6 +41,7 @@
+ cpu1: cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
++ secondary-boot-reg = <0x35004178>;
+ reg = <1>;
+ };
+ };
+--- 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 i
+ 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 i
+
+ 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);
--- /dev/null
+From e99fb6d01cddf38cffc11655aba4a96a981d604e Mon Sep 17 00:00:00 2001
+From: Kapil Hali <kapilh@broadcom.com>
+Date: Wed, 25 Nov 2015 13:25:55 -0500
+Subject: [PATCH 133/134] 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>
+---
+ arch/arm/mach-bcm/Kconfig | 2 +
+ arch/arm/mach-bcm/Makefile | 8 +-
+ arch/arm/mach-bcm/kona_smp.c | 228 ----------------------------------
+ arch/arm/mach-bcm/platsmp.c | 290 +++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 298 insertions(+), 230 deletions(-)
+ delete mode 100644 arch/arm/mach-bcm/kona_smp.c
+ create mode 100644 arch/arm/mach-bcm/platsmp.c
+
+--- a/arch/arm/mach-bcm/Makefile
++++ b/arch/arm/mach-bcm/Makefile
+@@ -20,7 +20,7 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bc
+ obj-$(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
+--- a/arch/arm/mach-bcm/kona_smp.c
++++ /dev/null
+@@ -1,228 +0,0 @@
+-/*
+- * Copyright (C) 2014-2015 Broadcom Corporation
+- * Copyright 2014 Linaro Limited
+- *
+- * This program is free software; you can redistribute it and/or
+- * modify it under the terms of the GNU General Public License as
+- * published by the Free Software Foundation version 2.
+- *
+- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+- * kind, whether express or implied; without even the implied warranty
+- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+- * GNU General Public License for more details.
+- */
+-
+-#include <linux/init.h>
+-#include <linux/errno.h>
+-#include <linux/io.h>
+-#include <linux/of.h>
+-#include <linux/sched.h>
+-
+-#include <asm/smp.h>
+-#include <asm/smp_plat.h>
+-#include <asm/smp_scu.h>
+-
+-/* Size of mapped Cortex A9 SCU address space */
+-#define CORTEX_A9_SCU_SIZE 0x58
+-
+-#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
+-#define BOOT_ADDR_CPUID_MASK 0x3
+-
+-/* 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_addr;
+-
+-/*
+- * Enable the Cortex A9 Snoop Control Unit
+- *
+- * By the time this is called we already know there are multiple
+- * cores present. We assume we're running on a Cortex A9 processor,
+- * so any trouble getting the base address register or getting the
+- * SCU base is a problem.
+- *
+- * Return 0 if successful or an error code otherwise.
+- */
+-static int __init scu_a9_enable(void)
+-{
+- unsigned long config_base;
+- void __iomem *scu_base;
+-
+- if (!scu_a9_has_base()) {
+- pr_err("no configuration base address register!\n");
+- return -ENXIO;
+- }
+-
+- /* Config base address register value is zero for uniprocessor */
+- config_base = scu_a9_get_base();
+- if (!config_base) {
+- pr_err("hardware reports only one core\n");
+- return -ENOENT;
+- }
+-
+- scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
+- if (!scu_base) {
+- pr_err("failed to remap config base (%lu/%u) for SCU\n",
+- config_base, CORTEX_A9_SCU_SIZE);
+- return -ENOMEM;
+- }
+-
+- scu_enable(scu_base);
+-
+- iounmap(scu_base); /* That's the last we'll need of this */
+-
+- return 0;
+-}
+-
+-static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
+-{
+- static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 };
+- struct device_node *cpus_node = NULL;
+- struct device_node *cpu_node = NULL;
+- int ret;
+-
+- /*
+- * 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.
+- */
+- 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
+- * returned, the SoC reported a uniprocessor configuration.
+- * We bail on any other error.
+- */
+- ret = scu_a9_enable();
+-out:
+- of_node_put(cpu_node);
+- of_node_put(cpus_node);
+-
+- if (ret) {
+- /* Update the CPU present map to reflect uniprocessor mode */
+- pr_warn("disabling SMP\n");
+- init_cpu_present(&only_cpu_0);
+- }
+-}
+-
+-/*
+- * The ROM code has the secondary cores looping, waiting for an event.
+- * When an event occurs each core examines the bottom two bits of the
+- * secondary boot register. When a core finds those bits contain its
+- * own core id, it performs initialization, including computing its boot
+- * address by clearing the boot register value's bottom two bits. The
+- * core signals that it is beginning its execution by writing its boot
+- * address back to the secondary boot register, and finally jumps to
+- * that address.
+- *
+- * So to start a core executing we need to:
+- * - Encode the (hardware) CPU id with the bottom bits of the secondary
+- * start address.
+- * - Write that value into the secondary boot register.
+- * - Generate an event to wake up the secondary CPU(s).
+- * - Wait for the secondary boot register to be re-written, which
+- * indicates the secondary core has started.
+- */
+-static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
+-{
+- void __iomem *boot_reg;
+- phys_addr_t boot_func;
+- u64 start_clock;
+- u32 cpu_id;
+- u32 boot_val;
+- bool timeout = false;
+-
+- cpu_id = cpu_logical_map(cpu);
+- if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
+- pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
+- return -EINVAL;
+- }
+-
+- if (!secondary_boot_addr) {
+- pr_err("required secondary boot register not specified\n");
+- return -EINVAL;
+- }
+-
+- 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 -ENOMEM;
+- }
+-
+- /*
+- * Secondary cores will start in secondary_startup(),
+- * defined in "arch/arm/kernel/head.S"
+- */
+- boot_func = virt_to_phys(secondary_startup);
+- BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
+- BUG_ON(boot_func > (phys_addr_t)U32_MAX);
+-
+- /* The core to start is encoded in the low bits */
+- boot_val = (u32)boot_func | cpu_id;
+- writel_relaxed(boot_val, boot_reg);
+-
+- sev();
+-
+- /* The low bits will be cleared once the core has started */
+- start_clock = local_clock();
+- while (!timeout && readl_relaxed(boot_reg) == boot_val)
+- timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
+-
+- iounmap(boot_reg);
+-
+- if (!timeout)
+- return 0;
+-
+- pr_err("timeout waiting for cpu %u to start\n", cpu_id);
+-
+- return -ENXIO;
+-}
+-
+-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);
+--- /dev/null
++++ b/arch/arm/mach-bcm/platsmp.c
+@@ -0,0 +1,290 @@
++/*
++ * Copyright (C) 2014-2015 Broadcom Corporation
++ * Copyright 2014 Linaro Limited
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation version 2.
++ *
++ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
++ * kind, whether express or implied; without even the implied warranty
++ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++
++#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>
++
++/* Size of mapped Cortex A9 SCU address space */
++#define CORTEX_A9_SCU_SIZE 0x58
++
++#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */
++#define BOOT_ADDR_CPUID_MASK 0x3
++
++/* 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_addr;
++
++/*
++ * Enable the Cortex A9 Snoop Control Unit
++ *
++ * By the time this is called we already know there are multiple
++ * cores present. We assume we're running on a Cortex A9 processor,
++ * so any trouble getting the base address register or getting the
++ * SCU base is a problem.
++ *
++ * Return 0 if successful or an error code otherwise.
++ */
++static int __init scu_a9_enable(void)
++{
++ unsigned long config_base;
++ void __iomem *scu_base;
++
++ if (!scu_a9_has_base()) {
++ pr_err("no configuration base address register!\n");
++ return -ENXIO;
++ }
++
++ /* Config base address register value is zero for uniprocessor */
++ config_base = scu_a9_get_base();
++ if (!config_base) {
++ pr_err("hardware reports only one core\n");
++ return -ENOENT;
++ }
++
++ scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE);
++ if (!scu_base) {
++ pr_err("failed to remap config base (%lu/%u) for SCU\n",
++ config_base, CORTEX_A9_SCU_SIZE);
++ return -ENOMEM;
++ }
++
++ scu_enable(scu_base);
++
++ iounmap(scu_base); /* That's the last we'll need of this */
++
++ 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 };
++ struct device_node *cpus_node = NULL;
++ struct device_node *cpu_node = NULL;
++ int ret;
++
++ /*
++ * 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.
++ */
++ 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
++ * returned, the SoC reported a uniprocessor configuration.
++ * We bail on any other error.
++ */
++ ret = scu_a9_enable();
++out:
++ of_node_put(cpu_node);
++ of_node_put(cpus_node);
++
++ if (ret) {
++ /* Update the CPU present map to reflect uniprocessor mode */
++ pr_warn("disabling SMP\n");
++ init_cpu_present(&only_cpu_0);
++ }
++}
++
++/*
++ * The ROM code has the secondary cores looping, waiting for an event.
++ * When an event occurs each core examines the bottom two bits of the
++ * secondary boot register. When a core finds those bits contain its
++ * own core id, it performs initialization, including computing its boot
++ * address by clearing the boot register value's bottom two bits. The
++ * core signals that it is beginning its execution by writing its boot
++ * address back to the secondary boot register, and finally jumps to
++ * that address.
++ *
++ * So to start a core executing we need to:
++ * - Encode the (hardware) CPU id with the bottom bits of the secondary
++ * start address.
++ * - Write that value into the secondary boot register.
++ * - Generate an event to wake up the secondary CPU(s).
++ * - Wait for the secondary boot register to be re-written, which
++ * indicates the secondary core has started.
++ */
++static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
++{
++ void __iomem *boot_reg;
++ phys_addr_t boot_func;
++ u64 start_clock;
++ u32 cpu_id;
++ u32 boot_val;
++ bool timeout = false;
++
++ cpu_id = cpu_logical_map(cpu);
++ if (cpu_id & ~BOOT_ADDR_CPUID_MASK) {
++ pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK);
++ return -EINVAL;
++ }
++
++ if (!secondary_boot_addr) {
++ pr_err("required secondary boot register not specified\n");
++ return -EINVAL;
++ }
++
++ 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 -ENOMEM;
++ }
++
++ /*
++ * Secondary cores will start in secondary_startup(),
++ * defined in "arch/arm/kernel/head.S"
++ */
++ boot_func = virt_to_phys(secondary_startup);
++ BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK);
++ BUG_ON(boot_func > (phys_addr_t)U32_MAX);
++
++ /* The core to start is encoded in the low bits */
++ boot_val = (u32)boot_func | cpu_id;
++ writel_relaxed(boot_val, boot_reg);
++
++ sev();
++
++ /* The low bits will be cleared once the core has started */
++ start_clock = local_clock();
++ while (!timeout && readl_relaxed(boot_reg) == boot_val)
++ timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS;
++
++ iounmap(boot_reg);
++
++ if (!timeout)
++ return 0;
++
++ pr_err("timeout waiting for cpu %u to start\n", cpu_id);
++
++ 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);
--- /dev/null
+From 16e1bf7dde22ee22a331aabf824cc31a6794a4cb Mon Sep 17 00:00:00 2001
+From: Jon Mason <jonmason@broadcom.com>
+Date: Thu, 15 Oct 2015 14:09:10 -0400
+Subject: [PATCH 134/134] ARM: BCM: Add SMP support for Broadcom 4708
+
+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 | 2 ++
+ arch/arm/mach-bcm/Kconfig | 1 +
+ arch/arm/mach-bcm/Makefile | 3 +++
+ 3 files changed, 6 insertions(+)
+
+--- a/arch/arm/boot/dts/bcm4708.dtsi
++++ b/arch/arm/boot/dts/bcm4708.dtsi
+@@ -15,6 +15,7 @@
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
++ enable-method = "brcm,bcm-nsp-smp";
+
+ cpu@0 {
+ device_type = "cpu";
+@@ -27,6 +28,7 @@
+ device_type = "cpu";
+ compatible = "arm,cortex-a9";
+ next-level-cache = <&L2>;
++ secondary-boot-reg = <0xffff0400>;
+ reg = <0x1>;
+ };
+ };
+--- a/arch/arm/mach-bcm/Kconfig
++++ b/arch/arm/mach-bcm/Kconfig
+@@ -41,6 +41,7 @@ config ARCH_BCM_5301X
+ select ARM_ERRATA_754322
+ select ARM_ERRATA_775420
+ select ARM_ERRATA_764369 if SMP
++ select HAVE_SMP
+
+ help
+ Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.
+--- a/arch/arm/mach-bcm/Makefile
++++ b/arch/arm/mach-bcm/Makefile
+@@ -36,6 +36,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2
+
+ # 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)
projects / openwrt.git / commitdiff