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>

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index f5e227b..b581c93 100644 (file)
--- 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));