mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 23:36:23 +09:00
d2912cb15b
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
|
|
/*
|
|
* OMAP4 SMP cpu-hotplug support
|
|
*
|
|
* Copyright (C) 2010 Texas Instruments, Inc.
|
|
* Author:
|
|
* Santosh Shilimkar <santosh.shilimkar@ti.com>
|
|
*
|
|
* Platform file needed for the OMAP4 SMP. This file is based on arm
|
|
* realview smp platform.
|
|
* Copyright (c) 2002 ARM Limited.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "omap-wakeupgen.h"
|
|
#include "common.h"
|
|
#include "powerdomain.h"
|
|
|
|
/*
|
|
* platform-specific code to shutdown a CPU
|
|
* Called with IRQs disabled
|
|
*/
|
|
void omap4_cpu_die(unsigned int cpu)
|
|
{
|
|
unsigned int boot_cpu = 0;
|
|
void __iomem *base = omap_get_wakeupgen_base();
|
|
|
|
/*
|
|
* we're ready for shutdown now, so do it
|
|
*/
|
|
if (omap_secure_apis_support()) {
|
|
if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
|
|
pr_err("Secure clear status failed\n");
|
|
} else {
|
|
writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
|
|
}
|
|
|
|
|
|
for (;;) {
|
|
/*
|
|
* Enter into low power state
|
|
*/
|
|
omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
|
|
|
|
if (omap_secure_apis_support())
|
|
boot_cpu = omap_read_auxcoreboot0() >> 9;
|
|
else
|
|
boot_cpu =
|
|
readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
|
|
|
|
if (boot_cpu == smp_processor_id()) {
|
|
/*
|
|
* OK, proper wakeup, we're done
|
|
*/
|
|
break;
|
|
}
|
|
pr_debug("CPU%u: spurious wakeup call\n", cpu);
|
|
}
|
|
}
|
|
|
|
/* Needed by kexec and platform_can_cpu_hotplug() */
|
|
int omap4_cpu_kill(unsigned int cpu)
|
|
{
|
|
return 1;
|
|
}
|