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Commit a58d5af7 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
Browse files

ARM: mvebu: conditionalize Armada 375 SMP workaround 



The Armada 375 SMP workaround only needs to be applied to the Z1
revision of the SoC. The A0 and later revisions have been fixed, and
no longer need this workaround.

Note that the initialization of the SMP workaround is delayed from
->smp_prepare_cpus() to ->smp_boot_secondary() because when
->smp_prepare_cpus() is called, the early initcalls have not be
called, so the mvebu-soc-id mechanism is not operational. Since the
workaround is anyway not needed before the secondary CPU is started,
we can delay its implementation until the ->smp_boot_secondary() call.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1399302326-6917-5-git-send-email-thomas.petazzoni@free-electrons.com


Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 5093dcfb

arch/arm/mach-mvebu/platsmp-a9.c

+11 −9
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <asm/smp_scu.h>

#include <asm/smp_plat.h>

#include "common.h"

#include "mvebu-soc-id.h"

#include "pmsu.h"



#define CRYPT0_ENG_ID   41
@@ -63,11 +64,19 @@ static int __cpuinit mvebu_cortex_a9_boot_secondary(unsigned int cpu, 
	 */

	hw_cpu = cpu_logical_map(cpu);



	if (of_machine_is_compatible("marvell,armada375"))

	if (of_machine_is_compatible("marvell,armada375")) {

		u32 dev, rev;



		if (mvebu_get_soc_id(&dev, &rev) == 0 &&

		    rev == ARMADA_375_Z1_REV)

			armada_375_smp_cpu1_enable_wa();



		mvebu_system_controller_set_cpu_boot_addr(mvebu_cortex_a9_secondary_startup);

	else

	}

	else {

		mvebu_pmsu_set_cpu_boot_addr(hw_cpu,

					     mvebu_cortex_a9_secondary_startup);

	}



	smp_wmb();

	ret = mvebu_cpu_reset_deassert(hw_cpu);
@@ -80,14 +89,7 @@ static int __cpuinit mvebu_cortex_a9_boot_secondary(unsigned int cpu, 
	return 0;

}



static void __init mvebu_cortex_a9_smp_prepare_cpus(unsigned int max_cpus)

{

	if (of_machine_is_compatible("marvell,armada375"))

		armada_375_smp_cpu1_enable_wa();

}



static struct smp_operations mvebu_cortex_a9_smp_ops __initdata = {

	.smp_prepare_cpus	= mvebu_cortex_a9_smp_prepare_cpus,

	.smp_boot_secondary	= mvebu_cortex_a9_boot_secondary,

#ifdef CONFIG_HOTPLUG_CPU

	.cpu_die		= armada_xp_cpu_die,