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Commit 61ce3ed5 authored by Daniel Lezcano's avatar Daniel Lezcano Committed by Michal Simek
Browse files

ARM: zynq: Remove invalidate cache for cpu die 



As there is no Power management unit on this board, it is not possible to power
down a core, just WFI is allowed. There is no point to invalidate the cache and
exit coherency.

Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-and-tested-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: default avatarMichal Simek <michal.simek@xilinx.com>
parent 0beb2bd3

arch/arm/mach-zynq/hotplug.c

+1 −31
Original line number Diff line number Diff line
@@ -10,35 +10,7 @@ 
 * 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/cacheflush.h>

#include <asm/cp15.h>

#include "common.h"



static inline void zynq_cpu_enter_lowpower(void)

{

	unsigned int v;



	flush_cache_all();

	asm volatile(

	"	mcr	p15, 0, %1, c7, c5, 0\n"

	"	dsb\n"

	/*

	 * Turn off coherency

	 */

	"	mrc	p15, 0, %0, c1, c0, 1\n"

	"	bic	%0, %0, #0x40\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");

}

#include <asm/proc-fns.h>



/*

 * platform-specific code to shutdown a CPU
@@ -47,8 +19,6 @@ static inline void zynq_cpu_enter_lowpower(void) 
 */

void zynq_platform_cpu_die(unsigned int cpu)

{

	zynq_cpu_enter_lowpower();



	/*

	 * 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