| /* |
| * Copyright (C) 2002 ARM Ltd. |
| * All Rights Reserved |
| * Copyright (c) 2011-2014, 2016, 2018, The Linux Foundation. |
| * All rights reserved. |
| * |
| * 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/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/smp.h> |
| #include <linux/cpu.h> |
| #include <soc/qcom/spm.h> |
| #include <soc/qcom/pm-legacy.h> |
| #include <asm/smp_plat.h> |
| #include "platsmp.h" |
| #include <soc/qcom/jtag.h> |
| |
| static cpumask_t cpu_dying_mask; |
| static DEFINE_PER_CPU(unsigned int, warm_boot_flag); |
| |
| static inline void cpu_enter_lowpower(void) |
| { |
| } |
| |
| static inline void cpu_leave_lowpower(void) |
| { |
| } |
| |
| static inline void platform_do_lowpower(unsigned int cpu) |
| { |
| lpm_cpu_hotplug_enter(cpu); |
| /* |
| * getting here, means that we have come out of low power mode |
| * without having been woken up - this shouldn't happen |
| * |
| */ |
| pr_err("%s: CPU%u has failed to Hotplug\n", __func__, cpu); |
| } |
| |
| int qcom_cpu_kill_legacy(unsigned int cpu) |
| { |
| int ret = 0; |
| |
| if (cpumask_test_and_clear_cpu(cpu, &cpu_dying_mask)) |
| ret = msm_pm_wait_cpu_shutdown(cpu); |
| |
| return ret ? 0 : 1; |
| } |
| |
| /* |
| * platform-specific code to shutdown a CPU |
| * |
| * Called with IRQs disabled |
| */ |
| void __ref qcom_cpu_die_legacy(unsigned int cpu) |
| { |
| if (unlikely(cpu != smp_processor_id())) { |
| pr_crit("%s: running on %u, should be %u\n", |
| __func__, smp_processor_id(), cpu); |
| WARN_ON(cpu); |
| } |
| /* |
| * we're ready for shutdown now, so do it |
| */ |
| cpu_enter_lowpower(); |
| platform_do_lowpower(cpu); |
| |
| pr_debug("CPU%u: %s: normal wakeup\n", cpu, __func__); |
| cpu_leave_lowpower(); |
| } |
| |
| int msm_platform_secondary_init(unsigned int cpu) |
| { |
| int ret; |
| unsigned int *warm_boot = this_cpu_ptr(&warm_boot_flag); |
| |
| if (!(*warm_boot)) { |
| *warm_boot = 1; |
| /* |
| * All CPU0 boots are considered warm boots (restore needed) |
| * since CPU0 is the system boot CPU and never cold-booted |
| * by the kernel. |
| */ |
| if (cpu) |
| return 0; |
| } |
| msm_jtag_restore_state(); |
| ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false); |
| |
| return ret; |
| } |
| |
| static int hotplug_dying_cpu(unsigned int cpu) |
| { |
| cpumask_set_cpu(cpu, &cpu_dying_mask); |
| return 0; |
| } |
| |
| static int __init init_hotplug_dying(void) |
| { |
| cpuhp_setup_state(CPUHP_AP_QCOM_SLEEP_STARTING, |
| "AP_QCOM_HOTPLUG_STARTING", NULL, hotplug_dying_cpu); |
| |
| return 0; |
| } |
| early_initcall(init_hotplug_dying); |