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d7eb28d274
The common ARM architecture code provides a generic function to exit coherency called v7_exit_coherency_flush(). Replace the machine specific implementation using the generic function. Tested on a i.MX 6Dual by hotplugging the secondary CPU under load through sysfs several 1000 times. Tested-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
44 lines
915 B
C
44 lines
915 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*/
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#include <linux/errno.h>
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#include <linux/jiffies.h>
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#include <asm/cacheflush.h>
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#include <asm/cp15.h>
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#include <asm/proc-fns.h>
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#include "common.h"
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/*
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* platform-specific code to shutdown a CPU
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*
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* Called with IRQs disabled
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*/
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void imx_cpu_die(unsigned int cpu)
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{
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v7_exit_coherency_flush(louis);
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/*
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* We use the cpu jumping argument register to sync with
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* imx_cpu_kill() which is running on cpu0 and waiting for
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* the register being cleared to kill the cpu.
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*/
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imx_set_cpu_arg(cpu, ~0);
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while (1)
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cpu_do_idle();
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}
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int imx_cpu_kill(unsigned int cpu)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(50);
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while (imx_get_cpu_arg(cpu) == 0)
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if (time_after(jiffies, timeout))
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return 0;
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imx_enable_cpu(cpu, false);
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imx_set_cpu_arg(cpu, 0);
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return 1;
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}
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