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Implement generic time support for MN10300. Signed-off-by: Mark Salter <[email protected]> Signed-off-by: David Howells <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* MN10300 clockevents | ||
| * | ||
| * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. | ||
| * Written by Mark Salter ([email protected]) | ||
| * | ||
| * 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 | ||
|
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|
|
||
| static int next_event(unsigned long delta, | ||
| struct clock_event_device *evt) | ||
| { | ||
| unsigned int cpu = smp_processor_id(); | ||
|
|
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| 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); | ||
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| 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(); | ||
|
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| cd = &per_cpu(mn10300_clockevent_device, cpu); | ||
| cd->event_handler(cd); | ||
|
|
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| return IRQ_HANDLED; | ||
| } | ||
|
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| static void event_handler(struct clock_event_device *dev) | ||
| { | ||
| } | ||
|
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| int __init init_clockevents(void) | ||
| { | ||
| struct clock_event_device *cd; | ||
| struct irqaction *iact; | ||
| unsigned int cpu = smp_processor_id(); | ||
|
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| cd = &per_cpu(mn10300_clockevent_device, cpu); | ||
|
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| if (cpu == 0) { | ||
| stop_jiffies_counter(); | ||
| cd->irq = TMJCIRQ; | ||
| } else { | ||
| stop_jiffies_counter1(); | ||
| cd->irq = TMJC1IRQ; | ||
| } | ||
|
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||
| cd->name = "Timestamp"; | ||
| cd->features = CLOCK_EVT_FEAT_ONESHOT; | ||
|
|
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| /* Calculate the min / max delta */ | ||
| clockevent_set_clock(cd, MN10300_JCCLK); | ||
|
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| cd->max_delta_ns = clockevent_delta2ns(TMJCBR_MAX, cd); | ||
| cd->min_delta_ns = clockevent_delta2ns(100, cd); | ||
|
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||
| 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; | ||
|
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||
| iact = &per_cpu(timer_irq, cpu); | ||
| iact->flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER; | ||
| iact->handler = timer_interrupt; | ||
|
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| clockevents_register_device(cd); | ||
|
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| #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 | ||
|
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| 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"; | ||
| } | ||
|
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| setup_jiffies_interrupt(cd->irq, iact); | ||
|
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||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* MN10300 clocksource | ||
| * | ||
| * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. | ||
| * Written by Mark Salter ([email protected]) | ||
| * | ||
| * 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" | ||
|
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| static cycle_t mn10300_read(struct clocksource *cs) | ||
| { | ||
| return read_timestamp_counter(); | ||
| } | ||
|
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| static struct clocksource clocksource_mn10300 = { | ||
| .name = "TSC", | ||
| .rating = 200, | ||
| .read = mn10300_read, | ||
| .mask = CLOCKSOURCE_MASK(32), | ||
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, | ||
| }; | ||
|
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| int __init init_clocksource(void) | ||
| { | ||
| startup_timestamp_counter(); | ||
| clocksource_set_clock(&clocksource_mn10300, MN10300_TSCCLK); | ||
| clocksource_register(&clocksource_mn10300); | ||
| return 0; | ||
| } |
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