// 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(0 x0, 0 x200) != 0 x0)
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 ;
}
Messung V0.5 in Prozent C=91 H=89 G=89
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-28)
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