176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <asm/cacheflush.h>
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#include <asm/smp_plat.h>
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#include <asm/vfp.h>
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#include <mach/jtag.h>
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#include <mach/msm_rtb.h>
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#include "pm.h"
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#include "spm.h"
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extern volatile int pen_release;
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static cpumask_t cpu_dying_mask;
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static DEFINE_PER_CPU(unsigned int, warm_boot_flag);
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static inline void cpu_enter_lowpower(void)
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{
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/* Just flush the cache. Changing the coherency is not yet
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* available on msm. */
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flush_cache_all();
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}
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static inline void cpu_leave_lowpower(void)
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{
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}
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static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
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{
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/* Just enter wfi for now. TODO: Properly shut off the cpu. */
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for (;;) {
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msm_pm_cpu_enter_lowpower(cpu);
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if (pen_release == cpu_logical_map(cpu)) {
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/*
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* OK, proper wakeup, we're done
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*/
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break;
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}
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/*
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* getting here, means that we have come out of WFI without
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* having been woken up - this shouldn't happen
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*
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* The trouble is, letting people know about this is not really
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* possible, since we are currently running incoherently, and
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* therefore cannot safely call printk() or anything else
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*/
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(*spurious)++;
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}
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}
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int platform_cpu_kill(unsigned int cpu)
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{
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int ret = 0;
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if (cpumask_test_and_clear_cpu(cpu, &cpu_dying_mask))
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ret = msm_pm_wait_cpu_shutdown(cpu);
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return ret ? 0 : 1;
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}
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/*
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* platform-specific code to shutdown a CPU
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*
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* Called with IRQs disabled
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*/
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void platform_cpu_die(unsigned int cpu)
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{
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int spurious = 0;
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if (unlikely(cpu != smp_processor_id())) {
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pr_crit("%s: running on %u, should be %u\n",
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__func__, smp_processor_id(), cpu);
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BUG();
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}
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/*
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* we're ready for shutdown now, so do it
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*/
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cpu_enter_lowpower();
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platform_do_lowpower(cpu, &spurious);
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pr_debug("CPU%u: %s: normal wakeup\n", cpu, __func__);
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cpu_leave_lowpower();
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if (spurious)
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pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
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}
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int platform_cpu_disable(unsigned int cpu)
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{
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/*
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* we don't allow CPU 0 to be shutdown (it is still too special
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* e.g. clock tick interrupts)
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*/
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return cpu == 0 ? -EPERM : 0;
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}
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#define CPU_SHIFT 0
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#define CPU_MASK 0xF
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#define CPU_OF(n) (((n) & CPU_MASK) << CPU_SHIFT)
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#define CPUSET_SHIFT 4
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#define CPUSET_MASK 0xFFFF
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#define CPUSET_OF(n) (((n) & CPUSET_MASK) << CPUSET_SHIFT)
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static int hotplug_rtb_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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/*
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* Bits [19:4] of the data are the online mask, lower 4 bits are the
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* cpu number that is being changed. Additionally, changes to the
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* online_mask that will be done by the current hotplug will be made
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* even though they aren't necessarily in the online mask yet.
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*
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* XXX: This design is limited to supporting at most 16 cpus
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*/
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int this_cpumask = CPUSET_OF(1 << (int)hcpu);
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int cpumask = CPUSET_OF(cpumask_bits(cpu_online_mask)[0]);
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int cpudata = CPU_OF((int)hcpu) | cpumask;
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switch (action & (~CPU_TASKS_FROZEN)) {
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case CPU_STARTING:
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uncached_logk(LOGK_HOTPLUG, (void *)(cpudata | this_cpumask));
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break;
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case CPU_DYING:
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cpumask_set_cpu((unsigned long)hcpu, &cpu_dying_mask);
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uncached_logk(LOGK_HOTPLUG, (void *)(cpudata & ~this_cpumask));
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block hotplug_rtb_notifier = {
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.notifier_call = hotplug_rtb_callback,
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};
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int msm_platform_secondary_init(unsigned int cpu)
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{
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int ret;
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unsigned int *warm_boot = &__get_cpu_var(warm_boot_flag);
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if (!(*warm_boot)) {
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*warm_boot = 1;
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return 0;
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}
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msm_jtag_restore_state();
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#if defined(CONFIG_VFP) && defined (CONFIG_CPU_PM)
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vfp_pm_resume();
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#endif
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ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false);
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return ret;
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}
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static int __init init_hotplug(void)
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{
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return register_hotcpu_notifier(&hotplug_rtb_notifier);
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}
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early_initcall(init_hotplug);
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