From 4898de3d15d8ba34aa7a1b0f753a476d52ebdf92 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Thu, 20 Dec 2012 19:37:32 +0800 Subject: ARM: PRIMA2: add new SiRFmarco SMP SoC infrastructures this patch adds tick timer, smp entries and generic DT machine for SiRFmarco dual-core SMP chips. with the added marco, we change the defconfig, using the same defconfig, we get a zImage which can work on both prima2 and marco. Signed-off-by: Barry Song Cc: Mark Rutland --- arch/arm/mach-prima2/hotplug.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 arch/arm/mach-prima2/hotplug.c (limited to 'arch/arm/mach-prima2/hotplug.c') diff --git a/arch/arm/mach-prima2/hotplug.c b/arch/arm/mach-prima2/hotplug.c new file mode 100644 index 000000000000..97c1ee586442 --- /dev/null +++ b/arch/arm/mach-prima2/hotplug.c @@ -0,0 +1,41 @@ +/* + * CPU hotplug support for CSR Marco dual-core SMP SoCs + * + * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include +#include +#include + +#include +#include + +static inline void platform_do_lowpower(unsigned int cpu) +{ + flush_cache_all(); + + /* we put the platform to just WFI */ + for (;;) { + __asm__ __volatile__("dsb\n\t" "wfi\n\t" + : : : "memory"); + if (pen_release == cpu_logical_map(cpu)) { + /* + * OK, proper wakeup, we're done + */ + break; + } + } +} + +/* + * platform-specific code to shutdown a CPU + * + * Called with IRQs disabled + */ +void sirfsoc_cpu_die(unsigned int cpu) +{ + platform_do_lowpower(cpu); +} -- cgit v1.2.3 From b0db321ba14daca748d5c8ca89298fdb637f9ba8 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 13 Feb 2013 22:49:04 +0100 Subject: ARM: prima2: fix __init section for cpu hotplug The code in arch/arm/mach-prima2/headsmp.S is used for both boot time initialization and for cpu hotplug, so it must not be discarded after the initial boot is complete. This replaces the __INIT annotation with __CPUINIT, and marks the sirfsoc_cpu_die as __ref to annotate that it correctly uses the sections. Without this patch, building prima2_defconfig results in: WARNING: arch/arm/mach-prima2/built-in.o(.cpuinit.text+0x130): Section mismatch in reference from the function sirfsoc_boot_secondary() to the function .init.text:sirfsoc_secondary_startup() The function __cpuinit sirfsoc_boot_secondary() references a function __init sirfsoc_secondary_startup(). If sirfsoc_secondary_startup is only used by sirfsoc_boot_secondary then annotate sirfsoc_secondary_startup with a matching annotation. Signed-off-by: Arnd Bergmann Cc: Barry Song --- arch/arm/mach-prima2/hotplug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm/mach-prima2/hotplug.c') diff --git a/arch/arm/mach-prima2/hotplug.c b/arch/arm/mach-prima2/hotplug.c index 97c1ee586442..f4b17cbababd 100644 --- a/arch/arm/mach-prima2/hotplug.c +++ b/arch/arm/mach-prima2/hotplug.c @@ -35,7 +35,7 @@ static inline void platform_do_lowpower(unsigned int cpu) * * Called with IRQs disabled */ -void sirfsoc_cpu_die(unsigned int cpu) +void __ref sirfsoc_cpu_die(unsigned int cpu) { platform_do_lowpower(cpu); } -- cgit v1.2.3