clocksource: armada-370-xp: Simplify TIMER_CTRL register access

This commit creates two functions to access the TIMER_CTRL register:
one for global one for the per-cpu. This makes the code much more
readable. In addition, since the TIMER_CTRL register is also used for
watchdog, this is preparation work for future thread-safe improvements.

Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index a3d2739..abc2c9f 100644 (file)
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -71,6 +71,18 @@ static u32 ticks_per_jiffy;
 
 static struct clock_event_device __percpu **percpu_armada_370_xp_evt;
 
+static void timer_ctrl_clrset(u32 clr, u32 set)
+{
+       writel((readl(timer_base + TIMER_CTRL_OFF) & ~clr) | set,
+               timer_base + TIMER_CTRL_OFF);
+}
+
+static void local_timer_ctrl_clrset(u32 clr, u32 set)
+{
+       writel((readl(local_base + TIMER_CTRL_OFF) & ~clr) | set,
+               local_base + TIMER_CTRL_OFF);
+}
+
 static u32 notrace armada_370_xp_read_sched_clock(void)
 {
        return ~readl(timer_base + TIMER0_VAL_OFF);
@@ -83,7 +95,6 @@ static int
 armada_370_xp_clkevt_next_event(unsigned long delta,
                                struct clock_event_device *dev)
 {
-       u32 u;
        /*
         * Clear clockevent timer interrupt.
         */
@@ -97,11 +108,8 @@ armada_370_xp_clkevt_next_event(unsigned long delta,
        /*
         * Enable the timer.
         */
-       u = readl(local_base + TIMER_CTRL_OFF);
-       u = ((u & ~TIMER0_RELOAD_EN) | TIMER0_EN |
-            TIMER0_DIV(TIMER_DIVIDER_SHIFT));
-       writel(u, local_base + TIMER_CTRL_OFF);
-
+       local_timer_ctrl_clrset(TIMER0_RELOAD_EN,
+                               TIMER0_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT));
        return 0;
 }
 
@@ -109,8 +117,6 @@ static void
 armada_370_xp_clkevt_mode(enum clock_event_mode mode,
                          struct clock_event_device *dev)
 {
-       u32 u;
-
        if (mode == CLOCK_EVT_MODE_PERIODIC) {
 
                /*
@@ -122,18 +128,14 @@ armada_370_xp_clkevt_mode(enum clock_event_mode mode,
                /*
                 * Enable timer.
                 */
-
-               u = readl(local_base + TIMER_CTRL_OFF);
-
-               writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
-                       TIMER0_DIV(TIMER_DIVIDER_SHIFT)),
-                       local_base + TIMER_CTRL_OFF);
+               local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN |
+                                          TIMER0_EN |
+                                          TIMER0_DIV(TIMER_DIVIDER_SHIFT));
        } else {
                /*
                 * Disable timer.
                 */
-               u = readl(local_base + TIMER_CTRL_OFF);
-               writel(u & ~TIMER0_EN, local_base + TIMER_CTRL_OFF);
+               local_timer_ctrl_clrset(TIMER0_EN, 0);
 
                /*
                 * ACK pending timer interrupt.
@@ -169,18 +171,18 @@ static irqreturn_t armada_370_xp_timer_interrupt(int irq, void *dev_id)
  */
 static int armada_370_xp_timer_setup(struct clock_event_device *evt)
 {
-       u32 u;
+       u32 clr = 0, set = 0;
        int cpu = smp_processor_id();
 
        /* Use existing clock_event for cpu 0 */
        if (!smp_processor_id())
                return 0;
 
-       u = readl(local_base + TIMER_CTRL_OFF);
        if (timer25Mhz)
-               writel(u | TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+               set = TIMER0_25MHZ;
        else
-               writel(u & ~TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+               clr = TIMER0_25MHZ;
+       local_timer_ctrl_clrset(clr, set);
 
        evt->name               = armada_370_xp_clkevt.name;
        evt->irq                = armada_370_xp_clkevt.irq;
@@ -212,7 +214,7 @@ static struct local_timer_ops armada_370_xp_local_timer_ops = {
 
 void __init armada_370_xp_timer_init(void)
 {
-       u32 u;
+       u32 clr = 0, set = 0;
        struct device_node *np;
        int res;
 
@@ -223,29 +225,20 @@ void __init armada_370_xp_timer_init(void)
 
        if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
                /* The fixed 25MHz timer is available so let's use it */
-               u = readl(local_base + TIMER_CTRL_OFF);
-               writel(u | TIMER0_25MHZ,
-                      local_base + TIMER_CTRL_OFF);
-               u = readl(timer_base + TIMER_CTRL_OFF);
-               writel(u | TIMER0_25MHZ,
-                      timer_base + TIMER_CTRL_OFF);
+               set = TIMER0_25MHZ;
                timer_clk = 25000000;
        } else {
                unsigned long rate = 0;
                struct clk *clk = of_clk_get(np, 0);
                WARN_ON(IS_ERR(clk));
                rate =  clk_get_rate(clk);
-               u = readl(local_base + TIMER_CTRL_OFF);
-               writel(u & ~(TIMER0_25MHZ),
-                      local_base + TIMER_CTRL_OFF);
-
-               u = readl(timer_base + TIMER_CTRL_OFF);
-               writel(u & ~(TIMER0_25MHZ),
-                      timer_base + TIMER_CTRL_OFF);
-
                timer_clk = rate / TIMER_DIVIDER;
+
+               clr = TIMER0_25MHZ;
                timer25Mhz = false;
        }
+       timer_ctrl_clrset(clr, set);
+       local_timer_ctrl_clrset(clr, set);
 
        /*
         * We use timer 0 as clocksource, and private(local) timer 0
@@ -267,10 +260,8 @@ void __init armada_370_xp_timer_init(void)
        writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
        writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
 
-       u = readl(timer_base + TIMER_CTRL_OFF);
-
-       writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
-               TIMER0_DIV(TIMER_DIVIDER_SHIFT)), timer_base + TIMER_CTRL_OFF);
+       timer_ctrl_clrset(0, TIMER0_EN | TIMER0_RELOAD_EN |
+                            TIMER0_DIV(TIMER_DIVIDER_SHIFT));
 
        clocksource_mmio_init(timer_base + TIMER0_VAL_OFF,
                              "armada_370_xp_clocksource",