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/*
* arch/arm/mach-tegra/hotplug.c
*
* Copyright (C) 2010-2011 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 <linux/cpu_pm.h>
#include <asm/cacheflush.h>
#include <mach/iomap.h>
#include "gic.h"
#include "sleep.h"
#define CPU_CLOCK(cpu) (0x1<<(8+cpu))
#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)
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
/* For Tegra2 use the software-written value of the reset register for status.*/
#define CLK_RST_CONTROLLER_CPU_CMPLX_STATUS CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET
#else
#define CLK_RST_CONTROLLER_CPU_CMPLX_STATUS \
(IO_ADDRESS(TEGRA_CLK_RESET_BASE) + 0x470)
#endif
int platform_cpu_kill(unsigned int cpu)
{
unsigned int reg;
do {
reg = readl(CLK_RST_CONTROLLER_CPU_CMPLX_STATUS);
cpu_relax();
} while (!(reg & (1<<cpu)));
reg = readl(CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
writel(reg | CPU_CLOCK(cpu), CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
return 1;
}
void platform_cpu_die(unsigned int cpu)
{
/* Flush the L1 data cache. */
flush_cache_all();
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
/* Place the current CPU in reset. */
tegra2_hotplug_shutdown();
#else
/* Disable GIC CPU interface for this CPU. */
tegra_gic_cpu_disable();
/* Tegra3 enters LPx states via WFI - do not propagate legacy IRQs
to CPU core to avoid fall through WFI; then GIC output will be
enabled, however at this time - CPU is dying - no interrupt should
have affinity to this CPU. */
tegra_gic_pass_through_disable();
/* Shut down the current CPU. */
tegra3_hotplug_shutdown();
#endif
/*
* 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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