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https://github.com/edk2-porting/linux-next.git
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9680b3d04d
This adds cpu hotplug for highbank. On highbank, a core is always reset and boots up the same path as a cold boot. Signed-off-by: Martin Bogomolni <martin@calxeda.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Jamie Iles <jamie@jamieiles.com> Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* Copyright 2011 Calxeda, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <asm/smp_scu.h>
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#include <asm/cacheflush.h>
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#include "core.h"
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extern void secondary_startup(void);
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int platform_cpu_kill(unsigned int cpu)
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{
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return 1;
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}
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/*
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* platform-specific code to shutdown a CPU
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*
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*/
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void platform_cpu_die(unsigned int cpu)
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{
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flush_cache_all();
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highbank_set_cpu_jump(cpu, secondary_startup);
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scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
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cpu_do_idle();
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/* We should never return from idle */
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panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);
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}
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int platform_cpu_disable(unsigned int cpu)
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{
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/*
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* CPU0 should not be shut down via hotplug. cpu_idle can WFI
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* or a proper shutdown or hibernate should be used.
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*/
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return cpu == 0 ? -EPERM : 0;
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}
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