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/*
* linux/arch/arm/mach-tegra/hotplug.c
*
* Copyright (C) 2010 NVIDIA Corporation
*
* 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/io.h>
#include <linux/smp.h>
#include <asm/cpu_pm.h>
#include <mach/iomap.h>
#include "sleep.h"
#define CLK_RST_CONTROLLER_CLK_CPU_CMPLX \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x4c)
#define CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x340)
#define CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x344)
int platform_cpu_kill(unsigned int cpu)
{
unsigned int reg;
do {
reg = readl(CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET);
cpu_relax();
} while (!(reg & (1<<cpu)));
reg = readl(CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
writel(reg | (1<<(8+cpu)), CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
return 1;
}
void platform_cpu_die(unsigned int cpu)
{
#ifdef DEBUG
unsigned int this_cpu = hard_smp_processor_id();
if (cpu != this_cpu) {
printk(KERN_CRIT "Eek! platform_cpu_die running on %u, should be %u\n",
this_cpu, cpu);
BUG();
}
#endif
tegra_sleep_reset();
/*
* tegra_cpu_suspend can return through tegra_cpu_resume, but that
* should never happen for a hotplugged cpu
*/
BUG();
}
int platform_cpu_disable(unsigned int cpu)
{
/*
* we don't allow CPU 0 to be shutdown (it is still too special
* e.g. clock tick interrupts)
*/
return cpu == 0 ? -EPERM : 0;
}
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