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Commit c970d4ef authored by Magnus Damm's avatar Magnus Damm Committed by Simon Horman
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ARM: shmobile: Introduce shared SCU SMP boot code 



Add SMP boot functions for SCU equipped mach-shmobile SoCs.

At this point shmobile_smp_scu_prepare_cpus() controls the SCU and
installs boot fn and arg, while shmobile_smp_scu_boot_secondary()
currently does nothing. In the future the boot function and arg
install code will be reworked, so the empty function is ground
work for that.

Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
parent 8b3e32c1

arch/arm/mach-shmobile/include/mach/common.h

+3 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ extern void shmobile_boot_vector(void); 
extern unsigned long shmobile_boot_fn;

extern unsigned long shmobile_boot_arg;

extern void shmobile_boot_scu(void);

extern void shmobile_smp_scu_prepare_cpus(unsigned int max_cpus);

extern int shmobile_smp_scu_boot_secondary(unsigned int cpu,

					   struct task_struct *idle);

struct clk;

extern int shmobile_clk_init(void);

extern void shmobile_handle_irq_intc(struct pt_regs *);

arch/arm/mach-shmobile/platsmp-scu.c

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 * SMP support for SoCs with SCU covered by mach-shmobile

 *

 * Copyright (C) 2013  Magnus Damm

 *

 * 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/init.h>

#include <linux/io.h>

#include <linux/smp.h>

#include <asm/smp_plat.h>

#include <asm/smp_scu.h>

#include <mach/common.h>



void __init shmobile_smp_scu_prepare_cpus(unsigned int max_cpus)

{

	shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);

	shmobile_boot_arg = (unsigned long)shmobile_scu_base;



	/* enable SCU and cache coherency on booting CPU */

	scu_enable(shmobile_scu_base);

	scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);

}



int shmobile_smp_scu_boot_secondary(unsigned int cpu, struct task_struct *idle)

{

	/* do nothing for now */

	return 0;

}