From 0e73da37d5b0edd7918dd3f9ee025a2167d0f788 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Wed, 2 Dec 2015 15:23:08 +0000 Subject: bcm53xx: update SMP patches Broadcom submitted new SMP patches for this SoC to upstream Linux, add them to OpenWrt. Signed-off-by: Hauke Mehrtens SVN-Revision: 47687 --- ...-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch | 560 +++++++++++++++++++++ 1 file changed, 560 insertions(+) create mode 100644 target/linux/bcm53xx/patches-4.1/133-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch (limited to 'target/linux/bcm53xx/patches-4.1/133-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch') diff --git a/target/linux/bcm53xx/patches-4.1/133-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch b/target/linux/bcm53xx/patches-4.1/133-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch new file mode 100644 index 0000000000..14a1da1eb5 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.1/133-ARM-BCM-Add-SMP-support-for-Broadcom-NSP.patch @@ -0,0 +1,560 @@ +From e99fb6d01cddf38cffc11655aba4a96a981d604e Mon Sep 17 00:00:00 2001 +From: Kapil Hali +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 +--- + 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 +-#include +-#include +-#include +-#include +- +-#include +-#include +-#include +- +-/* 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 ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#include ++#include ++#include ++#include ++ ++/* 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); -- cgit v1.2.3