diff options
Diffstat (limited to 'arch/mn10300/kernel')
| -rw-r--r-- | arch/mn10300/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/mn10300/kernel/cevt-mn10300.c | 131 | ||||
| -rw-r--r-- | arch/mn10300/kernel/csrc-mn10300.c | 35 | ||||
| -rw-r--r-- | arch/mn10300/kernel/internal.h | 13 | ||||
| -rw-r--r-- | arch/mn10300/kernel/irq.c | 32 | ||||
| -rw-r--r-- | arch/mn10300/kernel/smp.c | 15 | ||||
| -rw-r--r-- | arch/mn10300/kernel/time.c | 79 |
7 files changed, 268 insertions, 39 deletions
diff --git a/arch/mn10300/kernel/Makefile b/arch/mn10300/kernel/Makefile index 5b41192f496b..8f5f1e81baf5 100644 --- a/arch/mn10300/kernel/Makefile +++ b/arch/mn10300/kernel/Makefile @@ -28,3 +28,5 @@ obj-$(CONFIG_MN10300_RTC) += rtc.o obj-$(CONFIG_PROFILE) += profile.o profile-low.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_CSRC_MN10300) += csrc-mn10300.o +obj-$(CONFIG_CEVT_MN10300) += cevt-mn10300.o diff --git a/arch/mn10300/kernel/cevt-mn10300.c b/arch/mn10300/kernel/cevt-mn10300.c new file mode 100644 index 000000000000..d4cb535bf786 --- /dev/null +++ b/arch/mn10300/kernel/cevt-mn10300.c @@ -0,0 +1,131 @@ +/* MN10300 clockevents + * + * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. + * Written by Mark Salter (msalter@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/clockchips.h> +#include <linux/interrupt.h> +#include <linux/percpu.h> +#include <linux/smp.h> +#include <asm/timex.h> +#include "internal.h" + +#ifdef CONFIG_SMP +#if (CONFIG_NR_CPUS > 2) && !defined(CONFIG_GEENERIC_CLOCKEVENTS_BROADCAST) +#error "This doesn't scale well! Need per-core local timers." +#endif +#else /* CONFIG_SMP */ +#define stop_jiffies_counter1() +#define reload_jiffies_counter1(x) +#define TMJC1IRQ TMJCIRQ +#endif + + +static int next_event(unsigned long delta, + struct clock_event_device *evt) +{ + unsigned int cpu = smp_processor_id(); + + if (cpu == 0) { + stop_jiffies_counter(); + reload_jiffies_counter(delta - 1); + } else { + stop_jiffies_counter1(); + reload_jiffies_counter1(delta - 1); + } + return 0; +} + +static void set_clock_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + /* Nothing to do ... */ +} + +static DEFINE_PER_CPU(struct clock_event_device, mn10300_clockevent_device); +static DEFINE_PER_CPU(struct irqaction, timer_irq); + +static irqreturn_t timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *cd; + unsigned int cpu = smp_processor_id(); + + if (cpu == 0) + stop_jiffies_counter(); + else + stop_jiffies_counter1(); + + cd = &per_cpu(mn10300_clockevent_device, cpu); + cd->event_handler(cd); + + return IRQ_HANDLED; +} + +static void event_handler(struct clock_event_device *dev) +{ +} + +int __init init_clockevents(void) +{ + struct clock_event_device *cd; + struct irqaction *iact; + unsigned int cpu = smp_processor_id(); + + cd = &per_cpu(mn10300_clockevent_device, cpu); + + if (cpu == 0) { + stop_jiffies_counter(); + cd->irq = TMJCIRQ; + } else { + stop_jiffies_counter1(); + cd->irq = TMJC1IRQ; + } + + cd->name = "Timestamp"; + cd->features = CLOCK_EVT_FEAT_ONESHOT; + + /* Calculate the min / max delta */ + clockevent_set_clock(cd, MN10300_JCCLK); + + cd->max_delta_ns = clockevent_delta2ns(TMJCBR_MAX, cd); + cd->min_delta_ns = clockevent_delta2ns(100, cd); + + cd->rating = 200; + cd->cpumask = cpumask_of(smp_processor_id()); + cd->set_mode = set_clock_mode; + cd->event_handler = event_handler; + cd->set_next_event = next_event; + + iact = &per_cpu(timer_irq, cpu); + iact->flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER; + iact->handler = timer_interrupt; + + clockevents_register_device(cd); + +#if defined(CONFIG_SMP) && !defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) + /* setup timer irq affinity so it only runs on this cpu */ + { + struct irq_desc *desc; + desc = irq_to_desc(cd->irq); + cpumask_copy(desc->affinity, cpumask_of(cpu)); + iact->flags |= IRQF_NOBALANCING; + } +#endif + + if (cpu == 0) { + reload_jiffies_counter(MN10300_JC_PER_HZ - 1); + iact->name = "CPU0 Timer"; + } else { + reload_jiffies_counter1(MN10300_JC_PER_HZ - 1); + iact->name = "CPU1 Timer"; + } + + setup_jiffies_interrupt(cd->irq, iact); + + return 0; +} diff --git a/arch/mn10300/kernel/csrc-mn10300.c b/arch/mn10300/kernel/csrc-mn10300.c new file mode 100644 index 000000000000..ba2f0c4d6e01 --- /dev/null +++ b/arch/mn10300/kernel/csrc-mn10300.c @@ -0,0 +1,35 @@ +/* MN10300 clocksource + * + * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. + * Written by Mark Salter (msalter@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#include <linux/clocksource.h> +#include <linux/init.h> +#include <asm/timex.h> +#include "internal.h" + +static cycle_t mn10300_read(struct clocksource *cs) +{ + return read_timestamp_counter(); +} + +static struct clocksource clocksource_mn10300 = { + .name = "TSC", + .rating = 200, + .read = mn10300_read, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +int __init init_clocksource(void) +{ + startup_timestamp_counter(); + clocksource_set_clock(&clocksource_mn10300, MN10300_TSCCLK); + clocksource_register(&clocksource_mn10300); + return 0; +} diff --git a/arch/mn10300/kernel/internal.h b/arch/mn10300/kernel/internal.h index 3b1f48b7e7f4..6a064ab5af07 100644 --- a/arch/mn10300/kernel/internal.h +++ b/arch/mn10300/kernel/internal.h @@ -9,6 +9,9 @@ * 2 of the Licence, or (at your option) any later version. */ +struct clocksource; +struct clock_event_device; + /* * kthread.S */ @@ -30,3 +33,13 @@ extern void mn10300_low_ipi_handler(void); * time.c */ extern irqreturn_t local_timer_interrupt(void); + +/* + * time.c + */ +#ifdef CONFIG_CEVT_MN10300 +extern void clockevent_set_clock(struct clock_event_device *, unsigned int); +#endif +#ifdef CONFIG_CSRC_MN10300 +extern void clocksource_set_clock(struct clocksource *, unsigned int); +#endif diff --git a/arch/mn10300/kernel/irq.c b/arch/mn10300/kernel/irq.c index 80f15725ecad..2f66a45dcd18 100644 --- a/arch/mn10300/kernel/irq.c +++ b/arch/mn10300/kernel/irq.c @@ -16,14 +16,6 @@ #include <asm/setup.h> #include <asm/serial-regs.h> -#ifdef CONFIG_SMP -#undef GxICR -#define GxICR(X) CROSS_GxICR(X, irq_affinity_online[X]) - -#undef GxICR_u8 -#define GxICR_u8(X) CROSS_GxICR_u8(X, irq_affinity_online[X]) -#endif /* CONFIG_SMP */ - unsigned long __mn10300_irq_enabled_epsw[NR_CPUS] __cacheline_aligned_in_smp = { [0 ... NR_CPUS - 1] = EPSW_IE | EPSW_IM_7 }; @@ -92,9 +84,11 @@ static void mn10300_cpupic_mask_ack(unsigned int irq) GxICR(irq) = (tmp & GxICR_LEVEL); tmp2 = GxICR(irq); - irq_affinity_online[irq] = any_online_cpu(*irq_desc[irq].affinity); - GxICR(irq) = (tmp & (GxICR_LEVEL | GxICR_ENABLE)) | GxICR_DETECT; - tmp = GxICR(irq); + irq_affinity_online[irq] = + any_online_cpu(*irq_desc[irq].affinity); + CROSS_GxICR(irq, irq_affinity_online[irq]) = + (tmp & (GxICR_LEVEL | GxICR_ENABLE)) | GxICR_DETECT; + tmp = CROSS_GxICR(irq, irq_affinity_online[irq]); } arch_local_irq_restore(flags); @@ -128,8 +122,8 @@ static void mn10300_cpupic_unmask_clear(unsigned int irq) tmp = GxICR(irq); irq_affinity_online[irq] = any_online_cpu(*irq_desc[irq].affinity); - GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE | GxICR_DETECT; - tmp = GxICR(irq); + CROSS_GxICR(irq, irq_affinity_online[irq]) = (tmp & GxICR_LEVEL) | GxICR_ENABLE | GxICR_DETECT; + tmp = CROSS_GxICR(irq, irq_affinity_online[irq]); } arch_local_irq_restore(flags); @@ -217,7 +211,7 @@ static struct irq_chip mn10300_cpu_pic_level = { .unmask = mn10300_cpupic_unmask_clear, #ifdef CONFIG_SMP .set_affinity = mn10300_cpupic_setaffinity, -#endif /* CONFIG_SMP */ +#endif }; /* @@ -235,7 +229,7 @@ static struct irq_chip mn10300_cpu_pic_edge = { .unmask = mn10300_cpupic_unmask, #ifdef CONFIG_SMP .set_affinity = mn10300_cpupic_setaffinity, -#endif /* CONFIG_SMP */ +#endif }; /* @@ -446,9 +440,9 @@ void migrate_irqs(void) if (irq_affinity_online[irq] == self) { u16 x, tmp; - x = CROSS_GxICR(irq, self); - CROSS_GxICR(irq, self) = x & GxICR_LEVEL; - tmp = CROSS_GxICR(irq, self); + x = GxICR(irq); + GxICR(irq) = x & GxICR_LEVEL; + tmp = GxICR(irq); new = any_online_cpu(irq_desc[irq].affinity); irq_affinity_online[irq] = new; @@ -458,7 +452,7 @@ void migrate_irqs(void) tmp = CROSS_GxICR(irq, new); x &= GxICR_LEVEL | GxICR_ENABLE; - if (CROSS_GxICR(irq, self) & GxICR_REQUEST) + if (GxICR(irq) & GxICR_REQUEST) { x |= GxICR_REQUEST | GxICR_DETECT; CROSS_GxICR(irq, new) = x; tmp = CROSS_GxICR(irq, new); diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c index b80234c28e0d..0dcd1c686ba8 100644 --- a/arch/mn10300/kernel/smp.c +++ b/arch/mn10300/kernel/smp.c @@ -126,7 +126,6 @@ static struct irq_chip mn10300_ipi_type = { static irqreturn_t smp_reschedule_interrupt(int irq, void *dev_id); static irqreturn_t smp_call_function_interrupt(int irq, void *dev_id); -static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id); static struct irqaction reschedule_ipi = { .handler = smp_reschedule_interrupt, @@ -136,11 +135,15 @@ static struct irqaction call_function_ipi = { .handler = smp_call_function_interrupt, .name = "smp call function IPI" }; + +#if !defined(CONFIG_GENERIC_CLOCKEVENTS) || defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) +static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id); static struct irqaction local_timer_ipi = { .handler = smp_ipi_timer_interrupt, .flags = IRQF_DISABLED, .name = "smp local timer IPI" }; +#endif /** * init_ipi - Initialise the IPI mechanism @@ -165,11 +168,14 @@ static void init_ipi(void) mn10300_ipi_enable(CALL_FUNC_SINGLE_IPI); /* set up the local timer IPI */ +#if !defined(CONFIG_GENERIC_CLOCKEVENTS) || \ + defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) set_irq_chip_and_handler(LOCAL_TIMER_IPI, &mn10300_ipi_type, handle_percpu_irq); setup_irq(LOCAL_TIMER_IPI, &local_timer_ipi); set_intr_level(LOCAL_TIMER_IPI, LOCAL_TIMER_GxICR_LV); mn10300_ipi_enable(LOCAL_TIMER_IPI); +#endif #ifdef CONFIG_MN10300_CACHE_ENABLED /* set up the cache flush IPI */ @@ -505,6 +511,8 @@ void smp_nmi_call_function_interrupt(void) } } +#if !defined(CONFIG_GENERIC_CLOCKEVENTS) || \ + defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) /** * smp_ipi_timer_interrupt - Local timer IPI handler * @irq: The interrupt number. @@ -516,6 +524,7 @@ static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id) { return local_timer_interrupt(); } +#endif void __init smp_init_cpus(void) { @@ -620,7 +629,6 @@ void smp_prepare_cpu_init(void) int __init start_secondary(void *unused) { smp_cpu_init(); - smp_callin(); while (!cpu_isset(smp_processor_id(), smp_commenced_mask)) cpu_relax(); @@ -629,6 +637,9 @@ int __init start_secondary(void *unused) preempt_disable(); smp_online(); +#ifdef CONFIG_GENERIC_CLOCKEVENTS + init_clockevents(); +#endif cpu_idle(); return 0; } diff --git a/arch/mn10300/kernel/time.c b/arch/mn10300/kernel/time.c index 0cb9bdb3b6bd..f860a340acc9 100644 --- a/arch/mn10300/kernel/time.c +++ b/arch/mn10300/kernel/time.c @@ -17,6 +17,8 @@ #include <linux/smp.h> #include <linux/profile.h> #include <linux/cnt32_to_63.h> +#include <linux/clocksource.h> +#include <linux/clockchips.h> #include <asm/irq.h> #include <asm/div64.h> #include <asm/processor.h> @@ -27,14 +29,6 @@ static unsigned long mn10300_last_tsc; /* time-stamp counter at last time * interrupt occurred */ -static irqreturn_t timer_interrupt(int irq, void *dev_id); - -static struct irqaction timer_irq = { - .handler = timer_interrupt, - .flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER, - .name = "timer", -}; - static unsigned long sched_clock_multiplier; /* @@ -54,7 +48,7 @@ unsigned long long sched_clock(void) /* read the TSC value */ - tsc = 0 - get_cycles(); /* get_cycles() counts down */ + tsc = get_cycles(); /* expand to 64-bits. * - sched_clock() must be called once a minute or better or the @@ -103,6 +97,7 @@ irqreturn_t local_timer_interrupt(void) return IRQ_HANDLED; } +#ifndef CONFIG_GENERIC_TIME /* * advance the kernel's time keeping clocks (xtime and jiffies) * - we use Timer 0 & 1 cascaded as a clock to nudge us the next time @@ -116,11 +111,11 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id) write_seqlock(&xtime_lock); while (tsc = get_cycles(), - elapse = mn10300_last_tsc - tsc, /* time elapsed since last + elapse = tsc - mn10300_last_tsc, /* time elapsed since last * tick */ elapse > MN10300_TSC_PER_HZ ) { - mn10300_last_tsc -= MN10300_TSC_PER_HZ; + mn10300_last_tsc += MN10300_TSC_PER_HZ; /* advance the kernel's time tracking system */ do_timer(1); @@ -135,6 +130,50 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id) return ret; } +static struct irqaction timer_irq = { + .handler = timer_interrupt, + .flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER, + .name = "timer", +}; +#endif /* CONFIG_GENERIC_TIME */ + +#ifdef CONFIG_CSRC_MN10300 +void __init clocksource_set_clock(struct clocksource *cs, unsigned int clock) +{ + u64 temp; + u32 shift; + + /* Find a shift value */ + for (shift = 32; shift > 0; shift--) { + temp = (u64) NSEC_PER_SEC << shift; + do_div(temp, clock); + if ((temp >> 32) == 0) + break; + } + cs->shift = shift; + cs->mult = (u32) temp; +} +#endif + +#if CONFIG_CEVT_MN10300 +void __cpuinit clockevent_set_clock(struct clock_event_device *cd, + unsigned int clock) +{ + u64 temp; + u32 shift; + + /* Find a shift value */ + for (shift = 32; shift > 0; shift--) { + temp = (u64) clock << shift; + do_div(temp, NSEC_PER_SEC); + if ((temp >> 32) == 0) + break; + } + cd->shift = shift; + cd->mult = (u32) temp; +} +#endif + /* * initialise the various timers used by the main part of the kernel */ @@ -146,21 +185,25 @@ void __init time_init(void) */ TMPSCNT |= TMPSCNT_ENABLE; +#ifdef CONFIG_GENERIC_TIME + init_clocksource(); +#else startup_timestamp_counter(); +#endif printk(KERN_INFO "timestamp counter I/O clock running at %lu.%02lu" " (calibrated against RTC)\n", MN10300_TSCCLK / 1000000, (MN10300_TSCCLK / 10000) % 100); - mn10300_last_tsc = TMTSCBC; + mn10300_last_tsc = read_timestamp_counter(); - /* use timer 0 & 1 cascaded to tick at as close to HZ as possible */ - setup_irq(TMJCIRQ, &timer_irq); - - set_intr_level(TMJCIRQ, NUM2GxICR_LEVEL(CONFIG_TIMER_IRQ_LEVEL)); - - startup_jiffies_counter(); +#ifdef CONFIG_GENERIC_CLOCKEVENTS + init_clockevents(); +#else + reload_jiffies_counter(MN10300_JC_PER_HZ - 1); + setup_jiffies_interrupt(TMJCIRQ, &timer_irq, CONFIG_TIMER_IRQ_LEVEL); +#endif #ifdef CONFIG_MN10300_WD_TIMER /* start the watchdog timer */ |