From bc28248ee25e5c239cbe6afca35a100b08401de5 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 17 May 2009 18:58:34 +0100 Subject: [ARM] smp: move core localtimer support out of platform specific files Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + arch/arm/include/asm/localtimer.h | 51 +++++++++++++++++++++++++++ arch/arm/include/asm/smp.h | 40 --------------------- arch/arm/kernel/smp.c | 56 ++++++++++++++++++++++++----- arch/arm/mach-realview/localtimer.c | 70 ++++++++----------------------------- arch/arm/mach-realview/platsmp.c | 14 ++++---- 6 files changed, 121 insertions(+), 111 deletions(-) create mode 100644 arch/arm/include/asm/localtimer.h (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index e60ec54df334..ef4f860d5041 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -859,6 +859,7 @@ source "kernel/time/Kconfig" config SMP bool "Symmetric Multi-Processing (EXPERIMENTAL)" depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP) + depends on GENERIC_CLOCKEVENTS select USE_GENERIC_SMP_HELPERS help This enables support for systems with more than one CPU. If you have diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h new file mode 100644 index 000000000000..3f8c9ebb646c --- /dev/null +++ b/arch/arm/include/asm/localtimer.h @@ -0,0 +1,51 @@ +/* + * arch/arm/include/asm/localtimer.h + * + * Copyright (C) 2004-2005 ARM Ltd. + * + * 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. + */ +#ifndef __ASM_ARM_LOCALTIMER_H +#define __ASM_ARM_LOCALTIMER_H + +struct clock_event_device; + +/* + * Setup a per-cpu timer, whether it be a local timer or dummy broadcast + */ +void percpu_timer_setup(void); + +/* + * Called from assembly, this is the local timer IRQ handler + */ +asmlinkage void do_local_timer(struct pt_regs *); + + +#ifdef CONFIG_LOCAL_TIMERS +/* + * Platform provides this to acknowledge a local timer IRQ. + * Returns true if the local timer IRQ is to be processed. + */ +int local_timer_ack(void); + +/* + * Stop a local timer interrupt. + */ +void local_timer_stop(void); + +/* + * Setup a local timer interrupt for a CPU. + */ +void local_timer_setup(struct clock_event_device *); + +#else + +static inline void local_timer_stop(void) +{ +} + +#endif + +#endif diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index 5995935338e1..608f2d533ff2 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -55,11 +55,6 @@ extern void smp_store_cpu_info(unsigned int cpuid); */ extern void smp_cross_call(const struct cpumask *mask); -/* - * Broadcast a clock event to other CPUs. - */ -extern void smp_timer_broadcast(const struct cpumask *mask); - /* * Boot a secondary CPU, and assign it the specified idle task. * This also gives us the initial stack to use for this CPU. @@ -100,44 +95,9 @@ extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); #define arch_send_call_function_ipi_mask arch_send_call_function_ipi_mask -/* - * Local timer interrupt handling function (can be IPI'ed). - */ -extern void local_timer_interrupt(void); - -#ifdef CONFIG_LOCAL_TIMERS - -/* - * Stop a local timer interrupt. - */ -extern void local_timer_stop(void); - -/* - * Platform provides this to acknowledge a local timer IRQ - */ -extern int local_timer_ack(void); - -#else - -static inline void local_timer_stop(void) -{ -} - -#endif - -/* - * Setup a local timer interrupt for a CPU. - */ -extern void local_timer_setup(void); - /* * show local interrupt info */ extern void show_local_irqs(struct seq_file *); -/* - * Called from assembly, this is the local timer IRQ handler - */ -asmlinkage void do_local_timer(struct pt_regs *); - #endif /* ifndef __ASM_ARM_SMP_H */ diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 6014dfd22af4..91130e218aef 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include #include #include @@ -32,6 +34,7 @@ #include #include #include +#include /* * as from 2.5, kernels no longer have an init_tasks structure @@ -274,9 +277,9 @@ asmlinkage void __cpuinit secondary_start_kernel(void) local_fiq_enable(); /* - * Setup local timer for this CPU. + * Setup the percpu timer for this CPU. */ - local_timer_setup(); + percpu_timer_setup(); calibrate_delay(); @@ -383,10 +386,16 @@ void show_local_irqs(struct seq_file *p) seq_putc(p, '\n'); } +/* + * Timer (local or broadcast) support + */ +static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent); + static void ipi_timer(void) { + struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent); irq_enter(); - local_timer_interrupt(); + evt->event_handler(evt); irq_exit(); } @@ -405,6 +414,42 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs) } #endif +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +static void smp_timer_broadcast(const struct cpumask *mask) +{ + send_ipi_message(mask, IPI_TIMER); +} + +static void broadcast_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ +} + +static void local_timer_setup(struct clock_event_device *evt) +{ + evt->name = "dummy_timer"; + evt->features = CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_DUMMY; + evt->rating = 400; + evt->mult = 1; + evt->set_mode = broadcast_timer_set_mode; + evt->broadcast = smp_timer_broadcast; + + clockevents_register_device(evt); +} +#endif + +void __cpuinit percpu_timer_setup(void) +{ + unsigned int cpu = smp_processor_id(); + struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu); + + evt->cpumask = cpumask_of(cpu); + + local_timer_setup(evt); +} + static DEFINE_SPINLOCK(stop_lock); /* @@ -501,11 +546,6 @@ void smp_send_reschedule(int cpu) send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); } -void smp_timer_broadcast(const struct cpumask *mask) -{ - send_ipi_message(mask, IPI_TIMER); -} - void smp_send_stop(void) { cpumask_t mask = cpu_online_map; diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c index 1c01d13460f0..cd98e7acd94d 100644 --- a/arch/arm/mach-realview/localtimer.c +++ b/arch/arm/mach-realview/localtimer.c @@ -11,10 +11,8 @@ #include #include #include -#include #include #include -#include #include #include #include @@ -24,18 +22,6 @@ #include #include -static DEFINE_PER_CPU(struct clock_event_device, local_clockevent); - -/* - * Used on SMP for either the local timer or IPI_TIMER - */ -void local_timer_interrupt(void) -{ - struct clock_event_device *clk = &__get_cpu_var(local_clockevent); - - clk->event_handler(clk); -} - #ifdef CONFIG_LOCAL_TIMERS /* set up by the platform code */ @@ -44,7 +30,7 @@ void __iomem *twd_base; static unsigned long mpcore_timer_rate; static void local_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *clk) + struct clock_event_device *evt) { unsigned long ctrl; @@ -140,32 +126,29 @@ static void __cpuinit twd_calibrate_rate(void) /* * Setup the local clock events for a CPU. */ -void __cpuinit local_timer_setup(void) +void __cpuinit local_timer_setup(struct clock_event_device *evt) { - unsigned int cpu = smp_processor_id(); - struct clock_event_device *clk = &per_cpu(local_clockevent, cpu); unsigned long flags; twd_calibrate_rate(); - clk->name = "local_timer"; - clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - clk->rating = 350; - clk->set_mode = local_timer_set_mode; - clk->set_next_event = local_timer_set_next_event; - clk->irq = IRQ_LOCALTIMER; - clk->cpumask = cpumask_of(cpu); - clk->shift = 20; - clk->mult = div_sc(mpcore_timer_rate, NSEC_PER_SEC, clk->shift); - clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); - clk->min_delta_ns = clockevent_delta2ns(0xf, clk); + evt->name = "local_timer"; + evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + evt->rating = 350; + evt->set_mode = local_timer_set_mode; + evt->set_next_event = local_timer_set_next_event; + evt->irq = IRQ_LOCALTIMER; + evt->shift = 20; + evt->mult = div_sc(mpcore_timer_rate, NSEC_PER_SEC, evt->shift); + evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt); + evt->min_delta_ns = clockevent_delta2ns(0xf, evt); /* Make sure our local interrupt controller has this enabled */ local_irq_save(flags); get_irq_chip(IRQ_LOCALTIMER)->unmask(IRQ_LOCALTIMER); local_irq_restore(flags); - clockevents_register_device(clk); + clockevents_register_device(evt); } /* @@ -176,29 +159,4 @@ void __cpuexit local_timer_stop(void) __raw_writel(0, twd_base + TWD_TIMER_CONTROL); } -#else /* CONFIG_LOCAL_TIMERS */ - -static void dummy_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *clk) -{ -} - -void __cpuinit local_timer_setup(void) -{ - unsigned int cpu = smp_processor_id(); - struct clock_event_device *clk = &per_cpu(local_clockevent, cpu); - - clk->name = "dummy_timer"; - clk->features = CLOCK_EVT_FEAT_ONESHOT | - CLOCK_EVT_FEAT_PERIODIC | - CLOCK_EVT_FEAT_DUMMY; - clk->rating = 400; - clk->mult = 1; - clk->set_mode = dummy_timer_set_mode; - clk->broadcast = smp_timer_broadcast; - clk->cpumask = cpumask_of(cpu); - - clockevents_register_device(clk); -} - -#endif /* !CONFIG_LOCAL_TIMERS */ +#endif /* CONFIG_LOCAL_TIMERS */ diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index 30a9c68591f6..b34d3a57ce93 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -217,13 +218,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus) if (max_cpus > ncores) max_cpus = ncores; -#if defined(CONFIG_LOCAL_TIMERS) || defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) - /* - * Enable the local timer or broadcast device for the boot CPU. - */ - local_timer_setup(); -#endif - /* * Initialise the present map, which describes the set of CPUs * actually populated at the present time. @@ -239,6 +233,12 @@ void __init smp_prepare_cpus(unsigned int max_cpus) * WFI */ if (max_cpus > 1) { + /* + * Enable the local timer or broadcast device for the + * boot CPU, but only if we have more than one CPU. + */ + percpu_timer_setup(); + scu_enable(); poke_milo(); } -- cgit v1.2.3 From 49613d4d9ae759193915823e67de546fca58c951 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 16 May 2009 11:41:53 +0100 Subject: [ARM] smp: SCU is used on non-realview platforms The SCU can be used by non-realview platforms, so make it visible for other people to use rather than having them copy the header file. Signed-off-by: Russell King --- arch/arm/include/asm/smp_scu.h | 13 +++++++++++++ arch/arm/mach-realview/include/mach/scu.h | 13 ------------- arch/arm/mach-realview/platsmp.c | 2 +- 3 files changed, 14 insertions(+), 14 deletions(-) create mode 100644 arch/arm/include/asm/smp_scu.h delete mode 100644 arch/arm/mach-realview/include/mach/scu.h (limited to 'arch/arm') diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h new file mode 100644 index 000000000000..d55802d645af --- /dev/null +++ b/arch/arm/include/asm/smp_scu.h @@ -0,0 +1,13 @@ +#ifndef __ASMARM_ARCH_SCU_H +#define __ASMARM_ARCH_SCU_H + +/* + * SCU registers + */ +#define SCU_CTRL 0x00 +#define SCU_CONFIG 0x04 +#define SCU_CPU_STATUS 0x08 +#define SCU_INVALIDATE 0x0c +#define SCU_FPGA_REVISION 0x10 + +#endif diff --git a/arch/arm/mach-realview/include/mach/scu.h b/arch/arm/mach-realview/include/mach/scu.h deleted file mode 100644 index d55802d645af..000000000000 --- a/arch/arm/mach-realview/include/mach/scu.h +++ /dev/null @@ -1,13 +0,0 @@ -#ifndef __ASMARM_ARCH_SCU_H -#define __ASMARM_ARCH_SCU_H - -/* - * SCU registers - */ -#define SCU_CTRL 0x00 -#define SCU_CONFIG 0x04 -#define SCU_CPU_STATUS 0x08 -#define SCU_INVALIDATE 0x0c -#define SCU_FPGA_REVISION 0x10 - -#endif diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index b34d3a57ce93..c567d3e24447 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -23,7 +23,7 @@ #include #include -#include +#include #include "core.h" -- cgit v1.2.3 From a8cbcd92bd4bf893085eddf7f58e63ea98503d94 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 16 May 2009 11:51:14 +0100 Subject: [ARM] smp: separate SCU support code from realview Signed-off-by: Russell King --- arch/arm/Kconfig | 7 +++++++ arch/arm/include/asm/smp_scu.h | 10 ++-------- arch/arm/kernel/Makefile | 1 + arch/arm/kernel/smp_scu.c | 41 ++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-realview/platsmp.c | 29 +++++----------------------- 5 files changed, 56 insertions(+), 32 deletions(-) create mode 100644 arch/arm/kernel/smp_scu.c (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ef4f860d5041..f19a9519a723 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -861,6 +861,7 @@ config SMP depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP) depends on GENERIC_CLOCKEVENTS select USE_GENERIC_SMP_HELPERS + select HAVE_ARM_SCU if ARCH_REALVIEW help This enables support for systems with more than one CPU. If you have a system with only one CPU, like most personal computers, say N. If @@ -878,6 +879,12 @@ config SMP If you don't know what to do here, say N. +config HAVE_ARM_SCU + bool + depends on SMP + help + This option enables support for the ARM system coherency unit + choice prompt "Memory split" default VMSPLIT_3G diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h index d55802d645af..2376835015d6 100644 --- a/arch/arm/include/asm/smp_scu.h +++ b/arch/arm/include/asm/smp_scu.h @@ -1,13 +1,7 @@ #ifndef __ASMARM_ARCH_SCU_H #define __ASMARM_ARCH_SCU_H -/* - * SCU registers - */ -#define SCU_CTRL 0x00 -#define SCU_CONFIG 0x04 -#define SCU_CPU_STATUS 0x08 -#define SCU_INVALIDATE 0x0c -#define SCU_FPGA_REVISION 0x10 +unsigned int scu_get_core_count(void __iomem *); +void scu_enable(void __iomem *); #endif diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 11a5197a221f..90ffbaf23b4e 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_ARTHUR) += arthur.o obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_SMP) += smp.o +obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c new file mode 100644 index 000000000000..7f24ee9d7330 --- /dev/null +++ b/arch/arm/kernel/smp_scu.c @@ -0,0 +1,41 @@ +/* + * linux/arch/arm/kernel/smp_scu.c + * + * 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 + +#define SCU_CTRL 0x00 +#define SCU_CONFIG 0x04 +#define SCU_CPU_STATUS 0x08 +#define SCU_INVALIDATE 0x0c +#define SCU_FPGA_REVISION 0x10 + +/* + * Get the number of CPU cores from the SCU configuration + */ +unsigned int __init scu_get_core_count(void __iomem *scu_base) +{ + unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG); + return (ncores & 0x03) + 1; +} + +/* + * Enable the SCU + */ +void __init scu_enable(void __iomem *scu_base) +{ + u32 scu_ctrl; + + scu_ctrl = __raw_readl(scu_base + SCU_CTRL); + scu_ctrl |= 1; + __raw_writel(scu_ctrl, scu_base + SCU_CTRL); +} diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index c567d3e24447..c862ce19587e 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -45,31 +45,12 @@ static void __iomem *scu_base_addr(void) return (void __iomem *)0; } -static unsigned int __init get_core_count(void) +static inline unsigned int get_core_count(void) { - unsigned int ncores; void __iomem *scu_base = scu_base_addr(); - - if (scu_base) { - ncores = __raw_readl(scu_base + SCU_CONFIG); - ncores = (ncores & 0x03) + 1; - } else - ncores = 1; - - return ncores; -} - -/* - * Setup the SCU - */ -static void scu_enable(void) -{ - u32 scu_ctrl; - void __iomem *scu_base = scu_base_addr(); - - scu_ctrl = __raw_readl(scu_base + SCU_CTRL); - scu_ctrl |= 1; - __raw_writel(scu_ctrl, scu_base + SCU_CTRL); + if (scu_base) + return scu_get_core_count(scu_base); + return 1; } static DEFINE_SPINLOCK(boot_lock); @@ -239,7 +220,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) */ percpu_timer_setup(); - scu_enable(); + scu_enable(scu_base_addr()); poke_milo(); } } -- cgit v1.2.3 From f32f4ce25745209f16a5a6cef7442144b596c68a Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 16 May 2009 12:14:21 +0100 Subject: [ARM] smp: allow re-use of realview localtimer TWD support Signed-off-by: Russell King --- arch/arm/Kconfig | 7 ++ arch/arm/include/asm/hardware/arm_twd.h | 21 ---- arch/arm/include/asm/localtimer.h | 12 +++ arch/arm/include/asm/smp_twd.h | 12 +++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/smp_twd.c | 173 +++++++++++++++++++++++++++++++ arch/arm/mach-realview/Makefile | 3 +- arch/arm/mach-realview/core.h | 3 - arch/arm/mach-realview/localtimer.c | 144 +------------------------ arch/arm/mach-realview/realview_eb.c | 1 + arch/arm/mach-realview/realview_pb11mp.c | 1 + 11 files changed, 213 insertions(+), 165 deletions(-) delete mode 100644 arch/arm/include/asm/hardware/arm_twd.h create mode 100644 arch/arm/include/asm/smp_twd.h create mode 100644 arch/arm/kernel/smp_twd.c (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f19a9519a723..93d63bf927d5 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -885,6 +885,12 @@ config HAVE_ARM_SCU help This option enables support for the ARM system coherency unit +config HAVE_ARM_TWD + bool + depends on SMP + help + This options enables support for the ARM timer and watchdog unit + choice prompt "Memory split" default VMSPLIT_3G @@ -925,6 +931,7 @@ config LOCAL_TIMERS bool "Use local timer interrupts" depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP) default y + select HAVE_ARM_TWD if ARCH_REALVIEW help Enable support for local timers on SMP platforms, rather then the legacy IPI broadcast method. Local timers allows the system diff --git a/arch/arm/include/asm/hardware/arm_twd.h b/arch/arm/include/asm/hardware/arm_twd.h deleted file mode 100644 index e521b70713c8..000000000000 --- a/arch/arm/include/asm/hardware/arm_twd.h +++ /dev/null @@ -1,21 +0,0 @@ -#ifndef __ASM_HARDWARE_TWD_H -#define __ASM_HARDWARE_TWD_H - -#define TWD_TIMER_LOAD 0x00 -#define TWD_TIMER_COUNTER 0x04 -#define TWD_TIMER_CONTROL 0x08 -#define TWD_TIMER_INTSTAT 0x0C - -#define TWD_WDOG_LOAD 0x20 -#define TWD_WDOG_COUNTER 0x24 -#define TWD_WDOG_CONTROL 0x28 -#define TWD_WDOG_INTSTAT 0x2C -#define TWD_WDOG_RESETSTAT 0x30 -#define TWD_WDOG_DISABLE 0x34 - -#define TWD_TIMER_CONTROL_ENABLE (1 << 0) -#define TWD_TIMER_CONTROL_ONESHOT (0 << 1) -#define TWD_TIMER_CONTROL_PERIODIC (1 << 1) -#define TWD_TIMER_CONTROL_IT_ENABLE (1 << 2) - -#endif diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h index 3f8c9ebb646c..50c7e7cfd670 100644 --- a/arch/arm/include/asm/localtimer.h +++ b/arch/arm/include/asm/localtimer.h @@ -24,6 +24,16 @@ asmlinkage void do_local_timer(struct pt_regs *); #ifdef CONFIG_LOCAL_TIMERS + +#ifdef CONFIG_HAVE_ARM_TWD + +#include "smp_twd.h" + +#define local_timer_ack() twd_timer_ack() +#define local_timer_stop() twd_timer_stop() + +#else + /* * Platform provides this to acknowledge a local timer IRQ. * Returns true if the local timer IRQ is to be processed. @@ -35,6 +45,8 @@ int local_timer_ack(void); */ void local_timer_stop(void); +#endif + /* * Setup a local timer interrupt for a CPU. */ diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h new file mode 100644 index 000000000000..7be0978b2625 --- /dev/null +++ b/arch/arm/include/asm/smp_twd.h @@ -0,0 +1,12 @@ +#ifndef __ASMARM_SMP_TWD_H +#define __ASMARM_SMP_TWD_H + +struct clock_event_device; + +extern void __iomem *twd_base; + +void twd_timer_stop(void); +int twd_timer_ack(void); +void twd_timer_setup(struct clock_event_device *); + +#endif diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 90ffbaf23b4e..ff89d0b3abc5 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_ISA_DMA) += dma-isa.o obj-$(CONFIG_PCI) += bios32.o isa.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o +obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c new file mode 100644 index 000000000000..aabd62d6bd19 --- /dev/null +++ b/arch/arm/kernel/smp_twd.c @@ -0,0 +1,173 @@ +/* + * linux/arch/arm/kernel/smp_twd.c + * + * 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 +#include +#include + +#include +#include + +#define TWD_TIMER_LOAD 0x00 +#define TWD_TIMER_COUNTER 0x04 +#define TWD_TIMER_CONTROL 0x08 +#define TWD_TIMER_INTSTAT 0x0C + +#define TWD_WDOG_LOAD 0x20 +#define TWD_WDOG_COUNTER 0x24 +#define TWD_WDOG_CONTROL 0x28 +#define TWD_WDOG_INTSTAT 0x2C +#define TWD_WDOG_RESETSTAT 0x30 +#define TWD_WDOG_DISABLE 0x34 + +#define TWD_TIMER_CONTROL_ENABLE (1 << 0) +#define TWD_TIMER_CONTROL_ONESHOT (0 << 1) +#define TWD_TIMER_CONTROL_PERIODIC (1 << 1) +#define TWD_TIMER_CONTROL_IT_ENABLE (1 << 2) + +/* set up by the platform code */ +void __iomem *twd_base; + +static unsigned long twd_timer_rate; + +static void twd_set_mode(enum clock_event_mode mode, + struct clock_event_device *clk) +{ + unsigned long ctrl; + + switch(mode) { + case CLOCK_EVT_MODE_PERIODIC: + /* timer load already set up */ + ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE + | TWD_TIMER_CONTROL_PERIODIC; + break; + case CLOCK_EVT_MODE_ONESHOT: + /* period set, and timer enabled in 'next_event' hook */ + ctrl = TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT; + break; + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + default: + ctrl = 0; + } + + __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL); +} + +static int twd_set_next_event(unsigned long evt, + struct clock_event_device *unused) +{ + unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL); + + __raw_writel(evt, twd_base + TWD_TIMER_COUNTER); + __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL); + + return 0; +} + +/* + * local_timer_ack: checks for a local timer interrupt. + * + * If a local timer interrupt has occurred, acknowledge and return 1. + * Otherwise, return 0. + */ +int twd_timer_ack(void) +{ + if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) { + __raw_writel(1, twd_base + TWD_TIMER_INTSTAT); + return 1; + } + + return 0; +} + +static void __cpuinit twd_calibrate_rate(void) +{ + unsigned long load, count; + u64 waitjiffies; + + /* + * If this is the first time round, we need to work out how fast + * the timer ticks + */ + if (twd_timer_rate == 0) { + printk("Calibrating local timer... "); + + /* Wait for a tick to start */ + waitjiffies = get_jiffies_64() + 1; + + while (get_jiffies_64() < waitjiffies) + udelay(10); + + /* OK, now the tick has started, let's get the timer going */ + waitjiffies += 5; + + /* enable, no interrupt or reload */ + __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL); + + /* maximum value */ + __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER); + + while (get_jiffies_64() < waitjiffies) + udelay(10); + + count = __raw_readl(twd_base + TWD_TIMER_COUNTER); + + twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5); + + printk("%lu.%02luMHz.\n", twd_timer_rate / 1000000, + (twd_timer_rate / 100000) % 100); + } + + load = twd_timer_rate / HZ; + + __raw_writel(load, twd_base + TWD_TIMER_LOAD); +} + +/* + * Setup the local clock events for a CPU. + */ +void __cpuinit twd_timer_setup(struct clock_event_device *clk) +{ + unsigned long flags; + + twd_calibrate_rate(); + + clk->name = "local_timer"; + clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + clk->rating = 350; + clk->set_mode = twd_set_mode; + clk->set_next_event = twd_set_next_event; + clk->shift = 20; + clk->mult = div_sc(twd_timer_rate, NSEC_PER_SEC, clk->shift); + clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); + clk->min_delta_ns = clockevent_delta2ns(0xf, clk); + + /* Make sure our local interrupt controller has this enabled */ + local_irq_save(flags); + get_irq_chip(clk->irq)->unmask(clk->irq); + local_irq_restore(flags); + + clockevents_register_device(clk); +} + +/* + * take a local timer down + */ +void __cpuexit twd_timer_stop(void) +{ + __raw_writel(0, twd_base + TWD_TIMER_CONTROL); +} diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile index 7bea8ffc4b59..e13d0947ad0b 100644 --- a/arch/arm/mach-realview/Makefile +++ b/arch/arm/mach-realview/Makefile @@ -7,5 +7,6 @@ obj-$(CONFIG_MACH_REALVIEW_EB) += realview_eb.o obj-$(CONFIG_MACH_REALVIEW_PB11MP) += realview_pb11mp.o obj-$(CONFIG_MACH_REALVIEW_PB1176) += realview_pb1176.o obj-$(CONFIG_MACH_REALVIEW_PBA8) += realview_pba8.o -obj-$(CONFIG_SMP) += platsmp.o headsmp.o localtimer.o +obj-$(CONFIG_SMP) += platsmp.o headsmp.o obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o +obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h index 21c08637683b..59a337ba4be7 100644 --- a/arch/arm/mach-realview/core.h +++ b/arch/arm/mach-realview/core.h @@ -51,9 +51,6 @@ extern struct mmc_platform_data realview_mmc0_plat_data; extern struct mmc_platform_data realview_mmc1_plat_data; extern struct clcd_board clcd_plat_data; extern void __iomem *gic_cpu_base_addr; -#ifdef CONFIG_LOCAL_TIMERS -extern void __iomem *twd_base; -#endif extern void __iomem *timer0_va_base; extern void __iomem *timer1_va_base; extern void __iomem *timer2_va_base; diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c index cd98e7acd94d..60b4e111f459 100644 --- a/arch/arm/mach-realview/localtimer.c +++ b/arch/arm/mach-realview/localtimer.c @@ -9,154 +9,18 @@ * published by the Free Software Foundation. */ #include -#include -#include #include -#include #include -#include -#include -#include -#include -#include #include - -#ifdef CONFIG_LOCAL_TIMERS - -/* set up by the platform code */ -void __iomem *twd_base; - -static unsigned long mpcore_timer_rate; - -static void local_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - unsigned long ctrl; - - switch(mode) { - case CLOCK_EVT_MODE_PERIODIC: - /* timer load already set up */ - ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE - | TWD_TIMER_CONTROL_PERIODIC; - break; - case CLOCK_EVT_MODE_ONESHOT: - /* period set, and timer enabled in 'next_event' hook */ - ctrl = TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT; - break; - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - default: - ctrl = 0; - } - - __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL); -} - -static int local_timer_set_next_event(unsigned long evt, - struct clock_event_device *unused) -{ - unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL); - - __raw_writel(evt, twd_base + TWD_TIMER_COUNTER); - __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL); - - return 0; -} - -/* - * local_timer_ack: checks for a local timer interrupt. - * - * If a local timer interrupt has occurred, acknowledge and return 1. - * Otherwise, return 0. - */ -int local_timer_ack(void) -{ - if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) { - __raw_writel(1, twd_base + TWD_TIMER_INTSTAT); - return 1; - } - - return 0; -} - -static void __cpuinit twd_calibrate_rate(void) -{ - unsigned long load, count; - u64 waitjiffies; - - /* - * If this is the first time round, we need to work out how fast - * the timer ticks - */ - if (mpcore_timer_rate == 0) { - printk("Calibrating local timer... "); - - /* Wait for a tick to start */ - waitjiffies = get_jiffies_64() + 1; - - while (get_jiffies_64() < waitjiffies) - udelay(10); - - /* OK, now the tick has started, let's get the timer going */ - waitjiffies += 5; - - /* enable, no interrupt or reload */ - __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL); - - /* maximum value */ - __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER); - - while (get_jiffies_64() < waitjiffies) - udelay(10); - - count = __raw_readl(twd_base + TWD_TIMER_COUNTER); - - mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5); - - printk("%lu.%02luMHz.\n", mpcore_timer_rate / 1000000, - (mpcore_timer_rate / 100000) % 100); - } - - load = mpcore_timer_rate / HZ; - - __raw_writel(load, twd_base + TWD_TIMER_LOAD); -} +#include +#include /* * Setup the local clock events for a CPU. */ void __cpuinit local_timer_setup(struct clock_event_device *evt) { - unsigned long flags; - - twd_calibrate_rate(); - - evt->name = "local_timer"; - evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - evt->rating = 350; - evt->set_mode = local_timer_set_mode; - evt->set_next_event = local_timer_set_next_event; - evt->irq = IRQ_LOCALTIMER; - evt->shift = 20; - evt->mult = div_sc(mpcore_timer_rate, NSEC_PER_SEC, evt->shift); - evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt); - evt->min_delta_ns = clockevent_delta2ns(0xf, evt); - - /* Make sure our local interrupt controller has this enabled */ - local_irq_save(flags); - get_irq_chip(IRQ_LOCALTIMER)->unmask(IRQ_LOCALTIMER); - local_irq_restore(flags); - - clockevents_register_device(evt); + evt->irq = IRQ_LOCALTIMER; + twd_timer_setup(evt); } - -/* - * take a local timer down - */ -void __cpuexit local_timer_stop(void) -{ - __raw_writel(0, twd_base + TWD_TIMER_CONTROL); -} - -#endif /* CONFIG_LOCAL_TIMERS */ diff --git a/arch/arm/mach-realview/realview_eb.c b/arch/arm/mach-realview/realview_eb.c index c20fbef122b3..8dfa44e08a94 100644 --- a/arch/arm/mach-realview/realview_eb.c +++ b/arch/arm/mach-realview/realview_eb.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include diff --git a/arch/arm/mach-realview/realview_pb11mp.c b/arch/arm/mach-realview/realview_pb11mp.c index ea1e60eca359..dc4b16943907 100644 --- a/arch/arm/mach-realview/realview_pb11mp.c +++ b/arch/arm/mach-realview/realview_pb11mp.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include -- cgit v1.2.3 From 4c5158d4c3ab1f2927a740372a0ee9c3fed7ba47 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 17 May 2009 10:58:54 +0100 Subject: [ARM] smp: fix style issues in smp_twd.c Signed-off-by: Russell King --- arch/arm/kernel/smp_twd.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c index aabd62d6bd19..d8c88c633c6f 100644 --- a/arch/arm/kernel/smp_twd.c +++ b/arch/arm/kernel/smp_twd.c @@ -48,7 +48,7 @@ static void twd_set_mode(enum clock_event_mode mode, { unsigned long ctrl; - switch(mode) { + switch (mode) { case CLOCK_EVT_MODE_PERIODIC: /* timer load already set up */ ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE @@ -72,8 +72,10 @@ static int twd_set_next_event(unsigned long evt, { unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL); + ctrl |= TWD_TIMER_CONTROL_ENABLE; + __raw_writel(evt, twd_base + TWD_TIMER_COUNTER); - __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL); + __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL); return 0; } @@ -104,7 +106,7 @@ static void __cpuinit twd_calibrate_rate(void) * the timer ticks */ if (twd_timer_rate == 0) { - printk("Calibrating local timer... "); + printk(KERN_INFO "Calibrating local timer... "); /* Wait for a tick to start */ waitjiffies = get_jiffies_64() + 1; @@ -146,15 +148,15 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk) twd_calibrate_rate(); - clk->name = "local_timer"; - clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - clk->rating = 350; - clk->set_mode = twd_set_mode; - clk->set_next_event = twd_set_next_event; - clk->shift = 20; - clk->mult = div_sc(twd_timer_rate, NSEC_PER_SEC, clk->shift); - clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); - clk->min_delta_ns = clockevent_delta2ns(0xf, clk); + clk->name = "local_timer"; + clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + clk->rating = 350; + clk->set_mode = twd_set_mode; + clk->set_next_event = twd_set_next_event; + clk->shift = 20; + clk->mult = div_sc(twd_timer_rate, NSEC_PER_SEC, clk->shift); + clk->max_delta_ns = clockevent_delta2ns(0xffffffff, clk); + clk->min_delta_ns = clockevent_delta2ns(0xf, clk); /* Make sure our local interrupt controller has this enabled */ local_irq_save(flags); -- cgit v1.2.3 From af73110d23fb54f940197d93a410e9fa0cee66e2 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Mon, 18 May 2009 16:26:27 +0100 Subject: [ARM] 5516/1: Flush the D-cache after initialising the SCU On MP systems, the data loaded by CPU0 before the SCU was initialised may not be visible to the other CPUs. Signed-off-by: Catalin Marinas Signed-off-by: Russell King This also includes the following compile fix: This patch includes 'asm/cacheflush.h' which is needed to use 'flush_cache_all()' function. Signed-off-by: Santosh Shilimkar Signed-off-by: Russell King --- arch/arm/kernel/smp_scu.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/arm') diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c index 7f24ee9d7330..d3831f616ee9 100644 --- a/arch/arm/kernel/smp_scu.c +++ b/arch/arm/kernel/smp_scu.c @@ -12,6 +12,7 @@ #include #include +#include #define SCU_CTRL 0x00 #define SCU_CONFIG 0x04 @@ -38,4 +39,10 @@ void __init scu_enable(void __iomem *scu_base) scu_ctrl = __raw_readl(scu_base + SCU_CTRL); scu_ctrl |= 1; __raw_writel(scu_ctrl, scu_base + SCU_CTRL); + + /* + * Ensure that the data accessed by CPU0 before the SCU was + * initialised is visible to the other CPUs. + */ + flush_cache_all(); } -- cgit v1.2.3 From e03cdade0ca945a04e982525e50fef275190b77b Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 28 May 2009 14:16:52 +0100 Subject: [ARM] smp: use new cpumask functions Convert cpu_*_mask bit twiddling to the new set_cpu_*() API. Signed-off-by: Russell King --- arch/arm/include/asm/smp.h | 2 +- arch/arm/kernel/smp.c | 6 +++--- arch/arm/mach-realview/platsmp.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index 608f2d533ff2..a06e735b262a 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -41,7 +41,7 @@ extern void show_ipi_list(struct seq_file *p); asmlinkage void do_IPI(struct pt_regs *regs); /* - * Setup the SMP cpu_possible_map + * Setup the set of possible CPUs (via set_cpu_possible) */ extern void smp_init_cpus(void); diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 91130e218aef..0d8097fa4ca5 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -166,7 +166,7 @@ int __cpuexit __cpu_disable(void) * Take this CPU offline. Once we clear this, we can't return, * and we must not schedule until we're ready to give up the cpu. */ - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); /* * OK - migrate IRQs away from this CPU @@ -288,7 +288,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void) /* * OK, now it's safe to let the boot CPU continue */ - cpu_set(cpu, cpu_online_map); + set_cpu_online(cpu, true); /* * OK, it's off to the idle thread for us @@ -462,7 +462,7 @@ static void ipi_cpu_stop(unsigned int cpu) dump_stack(); spin_unlock(&stop_lock); - cpu_clear(cpu, cpu_online_map); + set_cpu_online(cpu, false); local_fiq_disable(); local_irq_disable(); diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index c862ce19587e..ca742172ea78 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -166,7 +166,7 @@ void __init smp_init_cpus(void) unsigned int i, ncores = get_core_count(); for (i = 0; i < ncores; i++) - cpu_set(i, cpu_possible_map); + set_cpu_possible(i, true); } void __init smp_prepare_cpus(unsigned int max_cpus) @@ -204,7 +204,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) * actually populated at the present time. */ for (i = 0; i < max_cpus; i++) - cpu_set(i, cpu_present_map); + set_cpu_present(i, true); /* * Initialise the SCU if there are more than one CPU and let -- cgit v1.2.3