ARM: oxnas: remove CPU hotplug implementation (0eb03799) · Commits · 戴 / test

arch/arm/mach-oxnas/Makefile

+0 −1

Original line number	Diff line number	Diff line
		obj-$(CONFIG_SMP) += platsmp.o headsmp.o
		obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

arch/arm/mach-oxnas/hotplug.c

deleted100644 → 0

+0 −109

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2002 ARM Ltd.
		* All Rights Reserved
		*
		* 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 <asm/cp15.h>
		#include <asm/smp_plat.h>

		static inline void cpu_enter_lowpower(void)
		{
		unsigned int v;

		asm volatile(
		" mcr p15, 0, %1, c7, c5, 0\n"
		" mcr p15, 0, %1, c7, c10, 4\n"
		/*
		* Turn off coherency
		*/
		" mrc p15, 0, %0, c1, c0, 1\n"
		" bic %0, %0, #0x20\n"
		" mcr p15, 0, %0, c1, c0, 1\n"
		" mrc p15, 0, %0, c1, c0, 0\n"
		" bic %0, %0, %2\n"
		" mcr p15, 0, %0, c1, c0, 0\n"
		: "=&r" (v)
		: "r" (0), "Ir" (CR_C)
		: "cc");
		}

		static inline void cpu_leave_lowpower(void)
		{
		unsigned int v;

		asm volatile( "mrc p15, 0, %0, c1, c0, 0\n"
		" orr %0, %0, %1\n"
		" mcr p15, 0, %0, c1, c0, 0\n"
		" mrc p15, 0, %0, c1, c0, 1\n"
		" orr %0, %0, #0x20\n"
		" mcr p15, 0, %0, c1, c0, 1\n"
		: "=&r" (v)
		: "Ir" (CR_C)
		: "cc");
		}

		static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
		{
		/*
		* there is no power-control hardware on this platform, so all
		* we can do is put the core into WFI; this is safe as the calling
		* code will have already disabled interrupts
		*/
		for (;;) {
		/*
		* here's the WFI
		*/
		asm(".word 0xe320f003\n"
		:
		:
		: "memory", "cc");

		if (pen_release == cpu_logical_map(cpu)) {
		/*
		* OK, proper wakeup, we're done
		*/
		break;
		}

		/*
		* Getting here, means that we have come out of WFI without
		* having been woken up - this shouldn't happen
		*
		* Just note it happening - when we're woken, we can report
		* its occurrence.
		*/
		(*spurious)++;
		}
		}

		/*
		* platform-specific code to shutdown a CPU
		*
		* Called with IRQs disabled
		*/
		void ox820_cpu_die(unsigned int cpu)
		{
		int spurious = 0;

		/*
		* we're ready for shutdown now, so do it
		*/
		cpu_enter_lowpower();
		platform_do_lowpower(cpu, &spurious);

		/*
		* bring this CPU back into the world of cache
		* coherency, and then restore interrupts
		*/
		cpu_leave_lowpower();

		if (spurious)
		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
		}

arch/arm/mach-oxnas/platsmp.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -19,7 +19,6 @@
		#include <asm/smp_scu.h>

		extern void ox820_secondary_startup(void);
		extern void ox820_cpu_die(unsigned int cpu);

		static void __iomem *cpu_ctrl;
		static void __iomem *gic_cpu_ctrl;
		@@ -94,9 +93,6 @@ unmap_scu:
		static const struct smp_operations ox820_smp_ops __initconst = {
		.smp_prepare_cpus = ox820_smp_prepare_cpus,
		.smp_boot_secondary = ox820_boot_secondary,
		#ifdef CONFIG_HOTPLUG_CPU
		.cpu_die = ox820_cpu_die,
		#endif
		};

		CPU_METHOD_OF_DECLARE(ox820_smp, "oxsemi,ox820-smp", &ox820_smp_ops);

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