diff options
| -rw-r--r-- | Documentation/devicetree/bindings/arm/cpus.txt | 1 | ||||
| -rw-r--r-- | arch/arm/mach-realview/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/mach-realview/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-realview/platsmp-dt.c | 91 |
4 files changed, 95 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt index 3a07a87fef20..19af9157f094 100644 --- a/Documentation/devicetree/bindings/arm/cpus.txt +++ b/Documentation/devicetree/bindings/arm/cpus.txt @@ -190,6 +190,7 @@ nodes to be present and contain the properties described below. "allwinner,sun6i-a31" "allwinner,sun8i-a23" "arm,psci" + "arm,realview-smp" "brcm,brahma-b15" "marvell,armada-375-smp" "marvell,armada-380-smp" diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig index edbc925e42c2..7316fff0f3ba 100644 --- a/arch/arm/mach-realview/Kconfig +++ b/arch/arm/mach-realview/Kconfig @@ -5,11 +5,13 @@ config REALVIEW_DT bool "Support RealView(R) Device Tree based boot" select ARM_GIC select CLK_SP810 + select HAVE_SMP select ICST select MFD_SYSCON select POWER_RESET select POWER_RESET_VERSATILE select POWER_SUPPLY + select SMP_ON_UP select SOC_REALVIEW select USE_OF help diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile index e07fdf7ae8a7..a46fa694cf07 100644 --- a/arch/arm/mach-realview/Makefile +++ b/arch/arm/mach-realview/Makefile @@ -3,7 +3,7 @@ # obj-y := core.o -obj-$(CONFIG_REALVIEW_DT) += realview-dt.o +obj-$(CONFIG_REALVIEW_DT) += realview-dt.o platsmp-dt.o obj-$(CONFIG_MACH_REALVIEW_EB) += realview_eb.o obj-$(CONFIG_MACH_REALVIEW_PB11MP) += realview_pb11mp.o obj-$(CONFIG_MACH_REALVIEW_PB1176) += realview_pb1176.o diff --git a/arch/arm/mach-realview/platsmp-dt.c b/arch/arm/mach-realview/platsmp-dt.c new file mode 100644 index 000000000000..65585392655b --- /dev/null +++ b/arch/arm/mach-realview/platsmp-dt.c @@ -0,0 +1,91 @@ +/* + * Copyright (C) 2015 Linus Walleij + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/smp.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> + +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include <asm/smp_scu.h> + +#include <plat/platsmp.h> + +#include "core.h" + +#define REALVIEW_SYS_FLAGSSET_OFFSET 0x30 + +static const struct of_device_id realview_scu_match[] = { + { .compatible = "arm,arm11mp-scu", }, + { .compatible = "arm,cortex-a9-scu", }, + { .compatible = "arm,cortex-a5-scu", }, + { } +}; + +static const struct of_device_id realview_syscon_match[] = { + { .compatible = "arm,core-module-integrator", }, + { .compatible = "arm,realview-eb-syscon", }, + { .compatible = "arm,realview-pb11mp-syscon", }, + { .compatible = "arm,realview-pbx-syscon", }, + { }, +}; + +static void __init realview_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + void __iomem *scu_base; + struct regmap *map; + unsigned int ncores; + int i; + + np = of_find_matching_node(NULL, realview_scu_match); + if (!np) { + pr_err("PLATSMP: No SCU base address\n"); + return; + } + scu_base = of_iomap(np, 0); + of_node_put(np); + if (!scu_base) { + pr_err("PLATSMP: No SCU remap\n"); + return; + } + + scu_enable(scu_base); + ncores = scu_get_core_count(scu_base); + pr_info("SCU: %d cores detected\n", ncores); + for (i = 0; i < ncores; i++) + set_cpu_possible(i, true); + iounmap(scu_base); + + /* The syscon contains the magic SMP start address registers */ + np = of_find_matching_node(NULL, realview_syscon_match); + if (!np) { + pr_err("PLATSMP: No syscon match\n"); + return; + } + map = syscon_node_to_regmap(np); + if (IS_ERR(map)) { + pr_err("PLATSMP: No syscon regmap\n"); + return; + } + /* Put the boot address in this magic register */ + regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET, + virt_to_phys(versatile_secondary_startup)); +} + +struct smp_operations realview_dt_smp_ops __initdata = { + .smp_prepare_cpus = realview_smp_prepare_cpus, + .smp_secondary_init = versatile_secondary_init, + .smp_boot_secondary = versatile_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = realview_cpu_die, +#endif +}; +CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops); |