clocksource: sun4i: Add clocksource and sched clock drivers

Use the second timer found on the Allwinner SoCs as a clock source and
sched clock, that were both not used yet on these platforms.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index f5e227b06ad5..b581c93f20b3 100644
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqreturn.h>
+#include <linux/sched_clock.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -96,6 +97,11 @@ static struct irqaction sun4i_timer_irq = {
         .dev_id = &sun4i_clockevent,
 };
 
+static u32 sun4i_timer_sched_read(void)
+{
+        return ~readl(timer_base + TIMER_CNTVAL_REG(1));
+}
+
 static void __init sun4i_timer_init(struct device_node *node)
 {
         unsigned long rate = 0;
@@ -117,6 +123,15 @@ static void __init sun4i_timer_init(struct device_node *node)
 
         rate = clk_get_rate(clk);
 
+        writel(~0, timer_base + TIMER_INTVAL_REG(1));
+        writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD |
+               TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
+               timer_base + TIMER_CTL_REG(1));
+
+        setup_sched_clock(sun4i_timer_sched_read, 32, rate);
+        clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
+                              rate, 300, 32, clocksource_mmio_readl_down);
+
         writel(rate / (TIMER_SCAL * HZ),
                timer_base + TIMER_INTVAL_REG(0));