projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9ff221ba NP |
1 | /* |
| 2 | * linux/arch/arm/mach-vexpress/mcpm_platsmp.c | |
| 3 | * | |
| 4 | * Created by: Nicolas Pitre, November 2012 | |
| 5 | * Copyright: (C) 2012-2013 Linaro Limited | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | * | |
| 11 | * Code to handle secondary CPU bringup and hotplug for the cluster power API. | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/smp.h> | |
| 16 | #include <linux/spinlock.h> | |
| 17 | ||
| 9ff221ba NP |
18 | #include <asm/mcpm.h> |
| 19 | #include <asm/smp.h> | |
| 20 | #include <asm/smp_plat.h> | |
| 21 | ||
| 1e566099 DM |
22 | static void cpu_to_pcpu(unsigned int cpu, |
| 23 | unsigned int *pcpu, unsigned int *pcluster) | |
| 24 | { | |
| 25 | unsigned int mpidr; | |
| 26 | ||
| 27 | mpidr = cpu_logical_map(cpu); | |
| 28 | *pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
| 29 | *pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
| 30 | } | |
| 31 | ||
| 8bd26e3a | 32 | static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 9ff221ba | 33 | { |
| 1e566099 | 34 | unsigned int pcpu, pcluster, ret; |
| 9ff221ba NP |
35 | extern void secondary_startup(void); |
| 36 | ||
| 1e566099 DM |
37 | cpu_to_pcpu(cpu, &pcpu, &pcluster); |
| 38 | ||
| 9ff221ba NP |
39 | pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n", |
| 40 | __func__, cpu, pcpu, pcluster); | |
| 41 | ||
| 42 | mcpm_set_entry_vector(pcpu, pcluster, NULL); | |
| 43 | ret = mcpm_cpu_power_up(pcpu, pcluster); | |
| 44 | if (ret) | |
| 45 | return ret; | |
| 46 | mcpm_set_entry_vector(pcpu, pcluster, secondary_startup); | |
| 47 | arch_send_wakeup_ipi_mask(cpumask_of(cpu)); | |
| 48 | dsb_sev(); | |
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 8bd26e3a | 52 | static void mcpm_secondary_init(unsigned int cpu) |
| 9ff221ba NP |
53 | { |
| 54 | mcpm_cpu_powered_up(); | |
| 9ff221ba NP |
55 | } |
| 56 | ||
| 57 | #ifdef CONFIG_HOTPLUG_CPU | |
| 58 | ||
| 0de0d646 DM |
59 | static int mcpm_cpu_kill(unsigned int cpu) |
| 60 | { | |
| 61 | unsigned int pcpu, pcluster; | |
| 62 | ||
| 63 | cpu_to_pcpu(cpu, &pcpu, &pcluster); | |
| 64 | ||
| 166aaf39 | 65 | return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster); |
| 0de0d646 DM |
66 | } |
| 67 | ||
| 787047ee | 68 | static bool mcpm_cpu_can_disable(unsigned int cpu) |
| 9ff221ba | 69 | { |
| 787047ee SB |
70 | /* We assume all CPUs may be shut down. */ |
| 71 | return true; | |
| 9ff221ba NP |
72 | } |
| 73 | ||
| 74 | static void mcpm_cpu_die(unsigned int cpu) | |
| 75 | { | |
| 76 | unsigned int mpidr, pcpu, pcluster; | |
| 77 | mpidr = read_cpuid_mpidr(); | |
| 78 | pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
| 79 | pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
| 80 | mcpm_set_entry_vector(pcpu, pcluster, NULL); | |
| 81 | mcpm_cpu_power_down(); | |
| 82 | } | |
| 83 | ||
| 84 | #endif | |
| 85 | ||
| 75305275 | 86 | static const struct smp_operations mcpm_smp_ops __initconst = { |
| 9ff221ba NP |
87 | .smp_boot_secondary = mcpm_boot_secondary, |
| 88 | .smp_secondary_init = mcpm_secondary_init, | |
| 89 | #ifdef CONFIG_HOTPLUG_CPU | |
| 0de0d646 | 90 | .cpu_kill = mcpm_cpu_kill, |
| 787047ee | 91 | .cpu_can_disable = mcpm_cpu_can_disable, |
| 9ff221ba NP |
92 | .cpu_die = mcpm_cpu_die, |
| 93 | #endif | |
| 94 | }; | |
| a7eb7c6f NP |
95 | |
| 96 | void __init mcpm_smp_set_ops(void) | |
| 97 | { | |
| 98 | smp_set_ops(&mcpm_smp_ops); | |
| 99 | } |