diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.3/130-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.3/130-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.3/130-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch b/target/linux/bcm53xx/patches-4.3/130-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch new file mode 100644 index 0000000..5e3bd77 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.3/130-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch @@ -0,0 +1,635 @@ +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); |