mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-27 11:55:53 +00:00
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
/*
|
|
* Copyright 2011 Calxeda, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/smp.h>
|
|
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#include "core.h"
|
|
|
|
extern void secondary_startup(void);
|
|
|
|
int platform_cpu_kill(unsigned int cpu)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* platform-specific code to shutdown a CPU
|
|
*
|
|
*/
|
|
void platform_cpu_die(unsigned int cpu)
|
|
{
|
|
flush_cache_all();
|
|
|
|
highbank_set_cpu_jump(cpu, secondary_startup);
|
|
scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);
|
|
|
|
cpu_do_idle();
|
|
|
|
/* We should never return from idle */
|
|
panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);
|
|
}
|
|
|
|
int platform_cpu_disable(unsigned int cpu)
|
|
{
|
|
/*
|
|
* CPU0 should not be shut down via hotplug. cpu_idle can WFI
|
|
* or a proper shutdown or hibernate should be used.
|
|
*/
|
|
return cpu == 0 ? -EPERM : 0;
|
|
}
|