--- /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 707ab07695ea8953a5bb56512e7bb38ca79c5c38 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
-Date: Thu, 19 Feb 2015 23:27:59 +0100
-Subject: [PATCH V2] ARM: BCM5301X: Implement SMP support
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
----
-V2: Change code after receiving Florian's comments:
- 1) Use "mmio-sram"
- 2) Remove commented out ASM call
- 3) Fix coding style in ASM
- 4) Simplify finding OF node
----
- Documentation/devicetree/bindings/arm/bcm4708.txt | 24 ++++
- Documentation/devicetree/bindings/arm/cpus.txt | 1 +
- arch/arm/boot/dts/bcm4708.dtsi | 13 ++
- arch/arm/mach-bcm/Makefile | 3 +
- arch/arm/mach-bcm/bcm5301x_headsmp.S | 45 ++++++
- arch/arm/mach-bcm/bcm5301x_smp.c | 158 ++++++++++++++++++++++
- 6 files changed, 244 insertions(+)
- create mode 100644 arch/arm/mach-bcm/bcm5301x_headsmp.S
- create mode 100644 arch/arm/mach-bcm/bcm5301x_smp.c
-
---- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm4708.txt
-+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm4708.txt
-@@ -6,3 +6,27 @@ Boards with the BCM4708 SoC shall have t
- Required root node property:
-
- compatible = "brcm,bcm4708";
-+
-+Optional sub-node properties:
-+
-+compatible = "mmio-sram" for SRAM access with IO memory region
-+ This is needed for SMP-capable SoCs which use part of
-+ SRAM for storing location of code to be executed by the
-+ extra cores.
-+ SMP support requires another sub-node with compatible
-+ property "brcm,bcm4708-sysram".
-+
-+Example:
-+
-+ sysram@ffff0000 {
-+ compatible = "mmio-sram";
-+ reg = <0xffff0000 0x10000>;
-+ #address-cells = <1>;
-+ #size-cells = <1>;
-+ ranges = <0 0xffff0000 0x10000>;
-+
-+ smp-sysram@0 {
-+ compatible = "brcm,bcm4708-sysram";
-+ reg = <0x0 0x1000>;
-+ };
-+ };
---- 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,bcm4708-smp"
- "brcm,brahma-b15"
- "marvell,armada-375-smp"
- "marvell,armada-380-smp"
---- 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,bcm4708-smp";
-
- cpu@0 {
- device_type = "cpu";
-@@ -31,4 +32,16 @@
- };
- };
-
-+ sysram@ffff0000 {
-+ compatible = "mmio-sram";
-+ reg = <0xffff0000 0x10000>;
-+ #address-cells = <1>;
-+ #size-cells = <1>;
-+ ranges = <0 0xffff0000 0x10000>;
-+
-+ smp-sysram@0 {
-+ compatible = "brcm,bcm4708-sysram";
-+ reg = <0x0 0x1000>;
-+ };
-+ };
- };
---- 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_SMP),y)
-+obj-$(CONFIG_ARCH_BCM_5301X) += bcm5301x_smp.o bcm5301x_headsmp.o
-+endif
-
- # BCM63XXx
- obj-$(CONFIG_ARCH_BCM_63XX) := bcm63xx.o
---- /dev/null
-+++ b/arch/arm/mach-bcm/bcm5301x_headsmp.S
-@@ -0,0 +1,45 @@
-+/*
-+ * Broadcom BCM470X / BCM5301X ARM platform code.
-+ *
-+ * Copyright (c) 2003 ARM Limited
-+ * All Rights Reserved
-+ *
-+ * Licensed under the GNU/GPL. See COPYING for details.
-+ */
-+#include <linux/linkage.h>
-+
-+/*
-+ * BCM5301X specific entry point for secondary CPUs.
-+ */
-+ENTRY(bcm5301x_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
-+
-+ /*
-+ * In case L1 cache has unpredictable contents at power-up
-+ * clean its contents without flushing.
-+ */
-+ bl v7_invalidate_l1
-+
-+ mov r0, #0
-+ mcr p15, 0, r0, c7, c5, 0 /* Invalidate icache */
-+ dsb
-+ isb
-+
-+ /*
-+ * we've been released from the holding pen: secondary_stack
-+ * should now contain the SVC stack for this core
-+ */
-+ b secondary_startup
-+ENDPROC(bcm5301x_secondary_startup)
-+
-+ .align 2
-+1: .long .
-+ .long pen_release
---- /dev/null
-+++ b/arch/arm/mach-bcm/bcm5301x_smp.c
-@@ -0,0 +1,158 @@
-+/*
-+ * Broadcom BCM470X / BCM5301X ARM platform code.
-+ *
-+ * Copyright (C) 2002 ARM Ltd.
-+ * Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com>
-+ *
-+ * Licensed under the GNU/GPL. See COPYING for details.
-+ */
-+
-+#include <asm/cacheflush.h>
-+#include <asm/delay.h>
-+#include <asm/smp_plat.h>
-+#include <asm/smp_scu.h>
-+
-+#include <linux/clockchips.h>
-+#include <linux/of.h>
-+#include <linux/of_address.h>
-+
-+#define SOC_ROM_LUT_OFF 0x400
-+
-+extern void bcm5301x_secondary_startup(void);
-+
-+static void __cpuinit write_pen_release(int val)
-+{
-+ pen_release = val;
-+ smp_wmb();
-+ sync_cache_w(&pen_release);
-+}
-+
-+static DEFINE_SPINLOCK(boot_lock);
-+
-+static void __init bcm5301x_smp_secondary_set_entry(void (*entry_point)(void))
-+{
-+ void __iomem *sysram_base_addr = NULL;
-+ struct device_node *node;
-+
-+ node = of_find_compatible_node(NULL, NULL, "brcm,bcm4708-sysram");
-+ if (!of_device_is_available(node))
-+ return;
-+
-+ sysram_base_addr = of_iomap(node, 0);
-+ if (!sysram_base_addr) {
-+ pr_warn("Failed to map sysram\n");
-+ return;
-+ }
-+
-+ writel(virt_to_phys(entry_point), sysram_base_addr + SOC_ROM_LUT_OFF);
-+
-+ dsb_sev(); /* Exit WFI */
-+ mb(); /* make sure write buffer is drained */
-+
-+ iounmap(sysram_base_addr);
-+}
-+
-+static void __init bcm5301x_smp_prepare_cpus(unsigned int max_cpus)
-+{
-+ void __iomem *scu_base;
-+
-+ if (!scu_a9_has_base()) {
-+ pr_warn("Unknown SCU base\n");
-+ return;
-+ }
-+
-+ scu_base = ioremap((phys_addr_t)scu_a9_get_base(), SZ_256);
-+ if (!scu_base) {
-+ pr_err("Failed to remap SCU\n");
-+ return;
-+ }
-+
-+ /* Initialise the SCU */
-+ scu_enable(scu_base);
-+
-+ /* Let CPUs know where to start */
-+ bcm5301x_smp_secondary_set_entry(bcm5301x_secondary_startup);
-+
-+ iounmap(scu_base);
-+}
-+
-+static void __cpuinit bcm5301x_smp_secondary_init(unsigned int cpu)
-+{
-+ trace_hardirqs_off();
-+
-+ /*
-+ * let the primary processor know we're out of the
-+ * pen, then head off into the C entry point
-+ */
-+ write_pen_release(-1);
-+
-+ /*
-+ * Synchronise with the boot thread.
-+ */
-+ spin_lock(&boot_lock);
-+ spin_unlock(&boot_lock);
-+}
-+
-+static int __cpuinit bcm5301x_smp_boot_secondary(unsigned int cpu,
-+ struct task_struct *idle)
-+{
-+ unsigned long timeout;
-+
-+ /*
-+ * set synchronisation state between this boot processor
-+ * and the secondary one
-+ */
-+ spin_lock(&boot_lock);
-+
-+ /*
-+ * 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.
-+ *
-+ * Note that "pen_release" is the hardware CPU ID, whereas
-+ * "cpu" is Linux's internal ID.
-+ */
-+ write_pen_release(cpu_logical_map(cpu));
-+
-+ /* Send the secondary CPU SEV */
-+ dsb_sev();
-+
-+ udelay(100);
-+
-+ /*
-+ * Send the secondary CPU a soft interrupt, thereby causing
-+ * the boot monitor to read the system wide flags register,
-+ * and branch to the address found there.
-+ */
-+ arch_send_wakeup_ipi_mask(cpumask_of(cpu));
-+
-+ /*
-+ * Timeout set on purpose in jiffies so that on slow processors
-+ * that must also have low HZ it will wait longer.
-+ */
-+ timeout = jiffies + (HZ * 10);
-+ while (time_before(jiffies, timeout)) {
-+ smp_rmb();
-+ if (pen_release == -1)
-+ break;
-+
-+ udelay(10);
-+ }
-+
-+ /*
-+ * now the secondary core is starting up let it run its
-+ * calibrations, then wait for it to finish
-+ */
-+ spin_unlock(&boot_lock);
-+
-+ return pen_release != -1 ? -ENOSYS : 0;
-+}
-+
-+static struct smp_operations bcm5301x_smp_ops __initdata = {
-+ .smp_prepare_cpus = bcm5301x_smp_prepare_cpus,
-+ .smp_secondary_init = bcm5301x_smp_secondary_init,
-+ .smp_boot_secondary = bcm5301x_smp_boot_secondary,
-+};
-+
-+CPU_METHOD_OF_DECLARE(bcm5301x_smp, "brcm,bcm4708-smp",
-+ &bcm5301x_smp_ops);
projects / openwrt.git / commitdiff