clocksource/drivers/fttmr010: Optimize sched_clock()

The sched_clock() call should be really fast so we want to
avoid an extra if() clause on the read path if possible.

Implement two sched_clock_read() functions, one if the timer
counts up and one if it counts down. Incidentally this also
mirrors how clocksource_mmio_init() works and make things
simple and easy to understand.
Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Andrew Jeffery <andrew@aj.id.au>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/timer-fttmr010.c

@@ -91,13 +91,16 @@ static inline struct fttmr010 *to_fttmr010(struct clock_event_device *evt)
 	return container_of(evt, struct fttmr010, clkevt);
 }
 
-static u64 notrace fttmr010_read_sched_clock(void)
+static u64 notrace fttmr010_read_sched_clock_up(void)
 {
-	if (local_fttmr->count_down)
-		return ~readl(local_fttmr->base + TIMER2_COUNT);
 	return readl(local_fttmr->base + TIMER2_COUNT);
 }
 
+static u64 notrace fttmr010_read_sched_clock_down(void)
+{
+	return ~readl(local_fttmr->base + TIMER2_COUNT);
+}
+
 static int fttmr010_timer_set_next_event(unsigned long cycles,
 				       struct clock_event_device *evt)
 {
@@ -302,15 +305,17 @@ static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
 				      "FTTMR010-TIMER2",
 				      fttmr010->tick_rate,
 				      300, 32, clocksource_mmio_readl_down);
+		sched_clock_register(fttmr010_read_sched_clock_down, 32,
+				     fttmr010->tick_rate);
 	} else {
 		writel(0, fttmr010->base + TIMER2_LOAD);
 		clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
 				      "FTTMR010-TIMER2",
 				      fttmr010->tick_rate,
 				      300, 32, clocksource_mmio_readl_up);
-	}
-	sched_clock_register(fttmr010_read_sched_clock, 32,
+		sched_clock_register(fttmr010_read_sched_clock_up, 32,
 				     fttmr010->tick_rate);
+	}
 
 	/*
 	 * Setup clockevent timer (interrupt-driven) on timer 1.