projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 05774088 SS |
1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify | |
| 3 | * it under the terms of the GNU General Public License version 2 as | |
| 4 | * published by the Free Software Foundation. | |
| 5 | * | |
| 6 | * This program is distributed in the hope that it will be useful, | |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 9 | * GNU General Public License for more details. | |
| 10 | * | |
| 11 | * Copyright (C) 2012 ARM Limited | |
| 12 | * | |
| 13 | * Author: Will Deacon <will.deacon@arm.com> | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/init.h> | |
| 17 | #include <linux/irqchip/arm-gic.h> | |
| 18 | #include <linux/smp.h> | |
| 19 | #include <linux/of.h> | |
| 20 | ||
| 21 | #include <asm/psci.h> | |
| 22 | #include <asm/smp_plat.h> | |
| 23 | ||
| 24 | /* | |
| 25 | * psci_smp assumes that the following is true about PSCI: | |
| 26 | * | |
| 27 | * cpu_suspend Suspend the execution on a CPU | |
| 28 | * @state we don't currently describe affinity levels, so just pass 0. | |
| 29 | * @entry_point the first instruction to be executed on return | |
| 30 | * returns 0 success, < 0 on failure | |
| 31 | * | |
| 32 | * cpu_off Power down a CPU | |
| 33 | * @state we don't currently describe affinity levels, so just pass 0. | |
| 34 | * no return on successful call | |
| 35 | * | |
| 36 | * cpu_on Power up a CPU | |
| 37 | * @cpuid cpuid of target CPU, as from MPIDR | |
| 38 | * @entry_point the first instruction to be executed on return | |
| 39 | * returns 0 success, < 0 on failure | |
| 40 | * | |
| 41 | * migrate Migrate the context to a different CPU | |
| 42 | * @cpuid cpuid of target CPU, as from MPIDR | |
| 43 | * returns 0 success, < 0 on failure | |
| 44 | * | |
| 45 | */ | |
| 46 | ||
| 47 | extern void secondary_startup(void); | |
| 48 | ||
| 8bd26e3a | 49 | static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 05774088 SS |
50 | { |
| 51 | if (psci_ops.cpu_on) | |
| 52 | return psci_ops.cpu_on(cpu_logical_map(cpu), | |
| 53 | __pa(secondary_startup)); | |
| 54 | return -ENODEV; | |
| 55 | } | |
| 56 | ||
| 57 | #ifdef CONFIG_HOTPLUG_CPU | |
| 58 | void __ref psci_cpu_die(unsigned int cpu) | |
| 59 | { | |
| 60 | const struct psci_power_state ps = { | |
| 61 | .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, | |
| 62 | }; | |
| 63 | ||
| 64 | if (psci_ops.cpu_off) | |
| 65 | psci_ops.cpu_off(ps); | |
| 66 | ||
| 67 | /* We should never return */ | |
| 68 | panic("psci: cpu %d failed to shutdown\n", cpu); | |
| 69 | } | |
| 05774088 SS |
70 | #endif |
| 71 | ||
| 72 | bool __init psci_smp_available(void) | |
| 73 | { | |
| 74 | /* is cpu_on available at least? */ | |
| 75 | return (psci_ops.cpu_on != NULL); | |
| 76 | } | |
| 77 | ||
| 78 | struct smp_operations __initdata psci_smp_ops = { | |
| 79 | .smp_boot_secondary = psci_boot_secondary, | |
| fdeb94b5 | 80 | #ifdef CONFIG_HOTPLUG_CPU |
| 05774088 | 81 | .cpu_die = psci_cpu_die, |
| fdeb94b5 | 82 | #endif |
| 05774088 | 83 | }; |