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Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* OMAP4 SMP cpu-hotplug support
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Author:
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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* Platform file needed for the OMAP4 SMP. This file is based on arm
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* realview smp platform.
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* Copyright (c) 2002 ARM Limited.
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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/io.h>
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#include "omap-wakeupgen.h"
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#include "common.h"
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#include "powerdomain.h"
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/*
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* platform-specific code to shutdown a CPU
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* Called with IRQs disabled
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*/
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void omap4_cpu_die(unsigned int cpu)
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{
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unsigned int boot_cpu = 0;
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void __iomem *base = omap_get_wakeupgen_base();
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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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if (omap_secure_apis_support()) {
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if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
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pr_err("Secure clear status failed\n");
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} else {
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writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
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}
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for (;;) {
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/*
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* Enter into low power state
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*/
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omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
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if (omap_secure_apis_support())
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boot_cpu = omap_read_auxcoreboot0() >> 9;
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else
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boot_cpu =
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readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
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if (boot_cpu == smp_processor_id()) {
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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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pr_debug("CPU%u: spurious wakeup call\n", cpu);
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}
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}
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/* Needed by kexec and platform_can_cpu_hotplug() */
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int omap4_cpu_kill(unsigned int cpu)
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{
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return 1;
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}
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