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>

1 files changed, 30 insertions, 1 deletions

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index 22a4daf5f0c8..a155bec06d18 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -79,6 +79,13 @@ static void gic_clockevent_cpu_exit(struct clock_event_device *cd)
         disable_percpu_irq(gic_timer_irq);
 }
 
+static void gic_update_frequency(void *data)
+{
+        unsigned long rate = (unsigned long)data;
+
+        clockevents_update_freq(this_cpu_ptr(&gic_clockevent_device), rate);
+}
+
 static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
                                 void *data)
 {
@@ -94,10 +101,26 @@ static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
         return NOTIFY_OK;
 }
 
+static int gic_clk_notifier(struct notifier_block *nb, unsigned long action,
+                            void *data)
+{
+        struct clk_notifier_data *cnd = data;
+
+        if (action == POST_RATE_CHANGE)
+                on_each_cpu(gic_update_frequency, (void *)cnd->new_rate, 1);
+
+        return NOTIFY_OK;
+}
+
+
 static struct notifier_block gic_cpu_nb = {
         .notifier_call = gic_cpu_notifier,
 };
 
+static struct notifier_block gic_clk_nb = {
+        .notifier_call = gic_clk_notifier,
+};
+
 static int gic_clockevent_init(void)
 {
         int ret;
@@ -160,6 +183,7 @@ void __init gic_clocksource_init(unsigned int frequency)
 static void __init gic_clocksource_of_init(struct device_node *node)
 {
         struct clk *clk;
+        int ret;
 
         if (WARN_ON(!gic_present || !node->parent ||
                     !of_device_is_compatible(node->parent, "mti,gic")))
@@ -186,7 +210,12 @@ static void __init gic_clocksource_of_init(struct device_node *node)
         }
 
         __gic_clocksource_init();
-        gic_clockevent_init();
+
+        ret = gic_clockevent_init();
+        if (!ret && !IS_ERR(clk)) {
+                if (clk_notifier_register(clk, &gic_clk_nb) < 0)
+                        pr_warn("GIC: Unable to register clock notifier\n");
+        }
 
         /* And finally start the counter */
         gic_start_count();