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CLOCKSOURCE: mips-gic: Update clockevent frequency on clock rate changes
This commit introduces the clockevent frequency update, using a clock notifier. It will be used to support CPUFreq on platforms using MIPS GIC based clockevents. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: James Hartley <James.Hartley@imgtec.com> Cc: Govindraj Raja <Govindraj.Raja@imgtec.com> Cc: Damien Horsley <Damien.Horsley@imgtec.com> Cc: James Hogan <James.Hogan@imgtec.com> Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Patchwork: https://patchwork.linux-mips.org/patch/10782/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -79,6 +79,13 @@ static void gic_clockevent_cpu_exit(struct clock_event_device *cd)
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disable_percpu_irq(gic_timer_irq);
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}
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static void gic_update_frequency(void *data)
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{
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unsigned long rate = (unsigned long)data;
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clockevents_update_freq(this_cpu_ptr(&gic_clockevent_device), rate);
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}
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static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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@ -94,10 +101,26 @@ static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
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return NOTIFY_OK;
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}
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static int gic_clk_notifier(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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struct clk_notifier_data *cnd = data;
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if (action == POST_RATE_CHANGE)
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on_each_cpu(gic_update_frequency, (void *)cnd->new_rate, 1);
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return NOTIFY_OK;
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}
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static struct notifier_block gic_cpu_nb = {
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.notifier_call = gic_cpu_notifier,
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};
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static struct notifier_block gic_clk_nb = {
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.notifier_call = gic_clk_notifier,
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};
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static int gic_clockevent_init(void)
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{
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int ret;
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@ -160,6 +183,7 @@ void __init gic_clocksource_init(unsigned int frequency)
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static void __init gic_clocksource_of_init(struct device_node *node)
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{
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struct clk *clk;
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int ret;
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if (WARN_ON(!gic_present || !node->parent ||
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!of_device_is_compatible(node->parent, "mti,gic")))
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@ -186,7 +210,12 @@ static void __init gic_clocksource_of_init(struct device_node *node)
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}
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__gic_clocksource_init();
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gic_clockevent_init();
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ret = gic_clockevent_init();
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if (!ret && !IS_ERR(clk)) {
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if (clk_notifier_register(clk, &gic_clk_nb) < 0)
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pr_warn("GIC: Unable to register clock notifier\n");
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}
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/* And finally start the counter */
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gic_start_count();
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