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ARM: shmobile: Introduce shared SCU SMP boot code

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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: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Magnus Damm 2013-07-31 16:07:12 +09:00 • committed by Simon Horman
parent 8b3e32c1fe
commit c970d4ef3a
2 changed files with 34 additions and 0 deletions
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3
arch/arm/mach-shmobile/include/mach/common.h
View file

@ -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 *);

31
arch/arm/mach-shmobile/platsmp-scu.c Normal file
View file

@ -0,0 +1,31 @@
/*
* 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;
}