From mboxrd@z Thu Jan 1 00:00:00 1970 From: magnus.damm@gmail.com (Magnus Damm) Date: Wed, 31 Jul 2013 16:07:12 +0900 Subject: [PATCH 01/07] ARM: shmobile: Introduce shared SCU SMP boot code In-Reply-To: <20130731070702.14444.64961.sendpatchset@w520> References: <20130731070702.14444.64961.sendpatchset@w520> Message-ID: <20130731070712.14444.49956.sendpatchset@w520> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Magnus Damm 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 --- arch/arm/mach-shmobile/include/mach/common.h | 3 ++ arch/arm/mach-shmobile/platsmp-scu.c | 31 ++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) --- 0001/arch/arm/mach-shmobile/include/mach/common.h +++ work/arch/arm/mach-shmobile/include/mach/common.h 2013-07-29 16:50:17.000000000 +0900 @@ -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 *); --- /dev/null +++ work/arch/arm/mach-shmobile/platsmp-scu.c 2013-07-29 21:39:30.000000000 +0900 @@ -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 +#include +#include +#include +#include +#include + +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; +}