From 1c51ed4fb9f11fa1e0873aa2d5b28f42a85ac299 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Tue, 14 Dec 2010 16:56:55 +0900 Subject: [PATCH] ARM: mach-shmobile: SMP base support Add SMP base support for R-Mobile / SH-Mobile processors. This patch contains all base code to support CONFIG_SMP regardless of ARCH_SHMOBILE processor type. Both local timer and CPU hotplug are supported, but no processor specific code is included. At this point only the default behavior is in place, so a single core will always be used even though CONFIG_SMP is enabled on multicore systems. The SMP Kconfig entry for arch/arm/Kconfig is excluded from this patch to simplify merging. Signed-off-by: Magnus Damm Signed-off-by: Paul Mundt --- arch/arm/mach-shmobile/Makefile | 6 ++ arch/arm/mach-shmobile/headsmp.S | 26 +++++++ arch/arm/mach-shmobile/hotplug.c | 41 +++++++++++ arch/arm/mach-shmobile/include/mach/common.h | 1 + .../include/mach/entry-macro-intc.S | 6 ++ arch/arm/mach-shmobile/include/mach/smp.h | 16 ++++ arch/arm/mach-shmobile/localtimer.c | 25 +++++++ arch/arm/mach-shmobile/platsmp.c | 73 +++++++++++++++++++ 8 files changed, 194 insertions(+) create mode 100644 arch/arm/mach-shmobile/headsmp.S create mode 100644 arch/arm/mach-shmobile/hotplug.c create mode 100644 arch/arm/mach-shmobile/include/mach/smp.h create mode 100644 arch/arm/mach-shmobile/localtimer.c create mode 100644 arch/arm/mach-shmobile/platsmp.c diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile index f5ad0892984d..d4346ddd9121 100644 --- a/arch/arm/mach-shmobile/Makefile +++ b/arch/arm/mach-shmobile/Makefile @@ -11,6 +11,11 @@ obj-$(CONFIG_ARCH_SH7377) += setup-sh7377.o clock-sh7377.o intc-sh7377.o obj-$(CONFIG_ARCH_SH7372) += setup-sh7372.o clock-sh7372.o intc-sh7372.o obj-$(CONFIG_ARCH_SH73A0) += setup-sh73a0.o clock-sh73a0.o +# SMP objects +smp-y := platsmp.o headsmp.o +smp-$(CONFIG_HOTPLUG_CPU) += hotplug.o +smp-$(CONFIG_LOCAL_TIMERS) += localtimer.o + # Pinmux setup pfc-y := pfc-$(CONFIG_ARCH_SH7367) += pfc-sh7367.o @@ -26,4 +31,5 @@ obj-$(CONFIG_MACH_AG5EVM) += board-ag5evm.o obj-$(CONFIG_MACH_MACKEREL) += board-mackerel.o # Framework support +obj-$(CONFIG_SMP) += $(smp-y) obj-$(CONFIG_GENERIC_GPIO) += $(pfc-y) diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S new file mode 100644 index 000000000000..a5c5af1e6bce --- /dev/null +++ b/arch/arm/mach-shmobile/headsmp.S @@ -0,0 +1,26 @@ +/* + * SMP support for R-Mobile / SH-Mobile + * + * Copyright (C) 2010 Magnus Damm + * Copyright (C) 2010 Takashi Yoshii + * + * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved + * + * 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 + + __INIT + +/* + * Reset vector for secondary CPUs. + * This will be mapped at address 0 by SBAR register. + * We need _long_ jump to the physical address. + */ + .align 12 +ENTRY(shmobile_secondary_vector) + ldr pc, 1f +1: .long secondary_startup - CONFIG_PAGE_OFFSET + CONFIG_MEMORY_START diff --git a/arch/arm/mach-shmobile/hotplug.c b/arch/arm/mach-shmobile/hotplug.c new file mode 100644 index 000000000000..238a0d97d2d5 --- /dev/null +++ b/arch/arm/mach-shmobile/hotplug.c @@ -0,0 +1,41 @@ +/* + * SMP support for R-Mobile / SH-Mobile + * + * Copyright (C) 2010 Magnus Damm + * + * Based on realview, Copyright (C) 2002 ARM Ltd, All Rights Reserved + * + * 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 + +int platform_cpu_kill(unsigned int cpu) +{ + return 1; +} + +void platform_cpu_die(unsigned int cpu) +{ + while (1) { + /* + * here's the WFI + */ + asm(".word 0xe320f003\n" + : + : + : "memory", "cc"); + } +} + +int platform_cpu_disable(unsigned int cpu) +{ + /* + * we don't allow CPU 0 to be shutdown (it is still too special + * e.g. clock tick interrupts) + */ + return cpu == 0 ? -EPERM : 0; +} diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h index 15932fd2435e..32822f7556ea 100644 --- a/arch/arm/mach-shmobile/include/mach/common.h +++ b/arch/arm/mach-shmobile/include/mach/common.h @@ -3,6 +3,7 @@ extern struct sys_timer shmobile_timer; extern void shmobile_setup_console(void); +extern void shmobile_secondary_vector(void); struct clk; extern int clk_init(void); diff --git a/arch/arm/mach-shmobile/include/mach/entry-macro-intc.S b/arch/arm/mach-shmobile/include/mach/entry-macro-intc.S index a285d13c7416..d06d4ba3251e 100644 --- a/arch/arm/mach-shmobile/include/mach/entry-macro-intc.S +++ b/arch/arm/mach-shmobile/include/mach/entry-macro-intc.S @@ -17,6 +17,12 @@ #include #include + .macro test_for_ipi, irqnr, irqstat, base, tmp + .endm + + .macro test_for_ltirq, irqnr, irqstat, base, tmp + .endm + .macro disable_fiq .endm diff --git a/arch/arm/mach-shmobile/include/mach/smp.h b/arch/arm/mach-shmobile/include/mach/smp.h new file mode 100644 index 000000000000..f4a35ff82c67 --- /dev/null +++ b/arch/arm/mach-shmobile/include/mach/smp.h @@ -0,0 +1,16 @@ +#ifndef __MACH_SMP_H +#define __MACH_SMP_H + +#include +#include + +/* + * We use IRQ1 as the IPI + */ +static inline void smp_cross_call(const struct cpumask *mask) +{ +#if defined(CONFIG_ARM_GIC) + gic_raise_softirq(mask, 1); +#endif +} +#endif diff --git a/arch/arm/mach-shmobile/localtimer.c b/arch/arm/mach-shmobile/localtimer.c new file mode 100644 index 000000000000..2111c28b724e --- /dev/null +++ b/arch/arm/mach-shmobile/localtimer.c @@ -0,0 +1,25 @@ +/* + * SMP support for R-Mobile / SH-Mobile - local timer portion + * + * Copyright (C) 2010 Magnus Damm + * + * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved + * + * 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 + +/* + * Setup the local clock events for a CPU. + */ +void __cpuinit local_timer_setup(struct clock_event_device *evt) +{ + evt->irq = 29; + twd_timer_setup(evt); +} diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c new file mode 100644 index 000000000000..b41f5d0650e4 --- /dev/null +++ b/arch/arm/mach-shmobile/platsmp.c @@ -0,0 +1,73 @@ +/* + * SMP support for R-Mobile / SH-Mobile + * + * Copyright (C) 2010 Magnus Damm + * + * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved + * + * 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 +#include + +static unsigned int __init shmobile_smp_get_core_count(void) +{ + return 1; +} + +static void __init shmobile_smp_prepare_cpus(void) +{ + /* do nothing for now */ +} + + +void __cpuinit platform_secondary_init(unsigned int cpu) +{ + trace_hardirqs_off(); +} + +int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + return -ENOSYS; +} + +void __init smp_init_cpus(void) +{ + unsigned int ncores = shmobile_smp_get_core_count(); + unsigned int i; + + for (i = 0; i < ncores; i++) + set_cpu_possible(i, true); +} + +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + unsigned int ncores = shmobile_smp_get_core_count(); + unsigned int cpu = smp_processor_id(); + int i; + + smp_store_cpu_info(cpu); + + if (max_cpus > ncores) + max_cpus = ncores; + + for (i = 0; i < max_cpus; i++) + set_cpu_present(i, true); + + if (max_cpus > 1) { + shmobile_smp_prepare_cpus(); + + /* + * Enable the local timer or broadcast device for the + * boot CPU, but only if we have more than one CPU. + */ + percpu_timer_setup(); + } +}