diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/common/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/common/mcpm_platsmp.c | 87 |
2 files changed, 88 insertions, 1 deletions
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index 9ec273188ccb..48c0ee578174 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -11,4 +11,4 @@ obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o obj-$(CONFIG_SHARP_SCOOP) += scoop.o obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o -obj-$(CONFIG_MCPM) += mcpm_head.o mcpm_entry.o vlock.o +obj-$(CONFIG_MCPM) += mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o diff --git a/arch/arm/common/mcpm_platsmp.c b/arch/arm/common/mcpm_platsmp.c new file mode 100644 index 000000000000..e7e3235b8b64 --- /dev/null +++ b/arch/arm/common/mcpm_platsmp.c @@ -0,0 +1,87 @@ +/* + * linux/arch/arm/mach-vexpress/mcpm_platsmp.c + * + * Created by: Nicolas Pitre, November 2012 + * Copyright: (C) 2012-2013 Linaro Limited + * + * 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. + * + * Code to handle secondary CPU bringup and hotplug for the cluster power API. + */ + +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/spinlock.h> + +#include <linux/irqchip/arm-gic.h> + +#include <asm/mcpm.h> +#include <asm/smp.h> +#include <asm/smp_plat.h> + +static void __init simple_smp_init_cpus(void) +{ +} + +static int __cpuinit mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + unsigned int mpidr, pcpu, pcluster, ret; + extern void secondary_startup(void); + + mpidr = cpu_logical_map(cpu); + pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", + __func__, cpu, pcpu, pcluster); + + mcpm_set_entry_vector(pcpu, pcluster, NULL); + ret = mcpm_cpu_power_up(pcpu, pcluster); + if (ret) + return ret; + mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); + arch_send_wakeup_ipi_mask(cpumask_of(cpu)); + dsb_sev(); + return 0; +} + +static void __cpuinit mcpm_secondary_init(unsigned int cpu) +{ + mcpm_cpu_powered_up(); + gic_secondary_init(0); +} + +#ifdef CONFIG_HOTPLUG_CPU + +static int mcpm_cpu_disable(unsigned int cpu) +{ + /* + * We assume all CPUs may be shut down. + * This would be the hook to use for eventual Secure + * OS migration requests as described in the PSCI spec. + */ + return 0; +} + +static void mcpm_cpu_die(unsigned int cpu) +{ + unsigned int mpidr, pcpu, pcluster; + mpidr = read_cpuid_mpidr(); + pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + mcpm_set_entry_vector(pcpu, pcluster, NULL); + mcpm_cpu_power_down(); +} + +#endif + +struct smp_operations __initdata mcpm_smp_ops = { + .smp_init_cpus = simple_smp_init_cpus, + .smp_boot_secondary = mcpm_boot_secondary, + .smp_secondary_init = mcpm_secondary_init, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_disable = mcpm_cpu_disable, + .cpu_die = mcpm_cpu_die, +#endif +}; |
