67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* 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/io.h>
|
|
|
|
#include "omap-wakeupgen.h"
|
|
#include "common.h"
|
|
#include "powerdomain.h"
|
|
|
|
/*
|
|
* platform-specific code to shutdown a CPU
|
|
* Called with IRQs disabled
|
|
*/
|
|
void __ref 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 {
|
|
__raw_writel(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();
|
|
else
|
|
boot_cpu =
|
|
__raw_readl(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);
|
|
}
|
|
}
|