ARM: 5863/1: fix bugs of clock source of NUC900

This patch fix following bugs:

1. typo error, CLOCK_EVT_MODE_PERIODIC -> CLOCK_EVT_FEAT_PERIODIC
2. TCSR register of timer1 missed PRESCALE
3. timer1 should be enabled before register it to clock source.
Signed-off-by: lijie <eltshanli@gmail.com>
Acked-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-w90x900/time.c

@@ -42,7 +42,10 @@
 #define TICKS_PER_SEC	100
 #define PRESCALE	0x63 /* Divider = prescale + 1 */
 
-unsigned int timer0_load;
+#define	TDR_SHIFT	24
+#define	TDR_MASK	((1 << TDR_SHIFT) - 1)
+
+static unsigned int timer0_load;
 
 static void nuc900_clockevent_setmode(enum clock_event_mode mode,
 		struct clock_event_device *clk)
@@ -88,7 +91,7 @@ static int nuc900_clockevent_setnextevent(unsigned long evt,
 static struct clock_event_device nuc900_clockevent_device = {
 	.name		= "nuc900-timer0",
 	.shift		= 32,
-	.features	= CLOCK_EVT_MODE_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
 	.set_mode	= nuc900_clockevent_setmode,
 	.set_next_event	= nuc900_clockevent_setnextevent,
 	.rating		= 300,
@@ -112,8 +115,23 @@ static struct irqaction nuc900_timer0_irq = {
 	.handler	= nuc900_timer0_interrupt,
 };
 
-static void __init nuc900_clockevents_init(unsigned int rate)
+static void __init nuc900_clockevents_init(void)
 {
+	unsigned int rate;
+	struct clk *clk = clk_get(NULL, "timer0");
+
+	BUG_ON(IS_ERR(clk));
+
+	__raw_writel(0x00, REG_TCSR0);
+
+	clk_enable(clk);
+	rate = clk_get_rate(clk) / (PRESCALE + 1);
+
+	timer0_load = (rate / TICKS_PER_SEC);
+
+	__raw_writel(RESETINT, REG_TISR);
+	setup_irq(IRQ_TIMER0, &nuc900_timer0_irq);
+
 	nuc900_clockevent_device.mult = div_sc(rate, NSEC_PER_SEC,
 					nuc900_clockevent_device.shift);
 	nuc900_clockevent_device.max_delta_ns = clockevent_delta2ns(0xffffffff,
@@ -127,26 +145,35 @@ static void __init nuc900_clockevents_init(unsigned int rate)
 
 static cycle_t nuc900_get_cycles(struct clocksource *cs)
 {
-	return ~__raw_readl(REG_TDR1);
+	return (~__raw_readl(REG_TDR1)) & TDR_MASK;
 }
 
 static struct clocksource clocksource_nuc900 = {
 	.name	= "nuc900-timer1",
 	.rating	= 200,
 	.read	= nuc900_get_cycles,
-	.mask	= CLOCKSOURCE_MASK(32),
-	.shift	= 20,
+	.mask	= CLOCKSOURCE_MASK(TDR_SHIFT),
+	.shift	= 10,
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-static void __init nuc900_clocksource_init(unsigned int rate)
+static void __init nuc900_clocksource_init(void)
 {
 	unsigned int val;
+	unsigned int rate;
+	struct clk *clk = clk_get(NULL, "timer1");
+
+	BUG_ON(IS_ERR(clk));
+
+	__raw_writel(0x00, REG_TCSR1);
+
+	clk_enable(clk);
+	rate = clk_get_rate(clk) / (PRESCALE + 1);
 
 	__raw_writel(0xffffffff, REG_TICR1);
 
 	val = __raw_readl(REG_TCSR1);
-	val |= (COUNTEN | PERIOD);
+	val |= (COUNTEN | PERIOD | PRESCALE);
 	__raw_writel(val, REG_TCSR1);
 
 	clocksource_nuc900.mult =
@@ -156,25 +183,8 @@ static void __init nuc900_clocksource_init(unsigned int rate)
 
 static void __init nuc900_timer_init(void)
 {
-	struct clk *ck_ext = clk_get(NULL, "ext");
-	unsigned int	rate;
-
-	BUG_ON(IS_ERR(ck_ext));
-
-	rate = clk_get_rate(ck_ext);
-	clk_put(ck_ext);
-	rate = rate / (PRESCALE + 0x01);
-
-	 /* set a known state */
-	__raw_writel(0x00, REG_TCSR0);
-	__raw_writel(0x00, REG_TCSR1);
-	__raw_writel(RESETINT, REG_TISR);
-	timer0_load = (rate / TICKS_PER_SEC);
-
-	setup_irq(IRQ_TIMER0, &nuc900_timer0_irq);
-
-	nuc900_clocksource_init(rate);
-	nuc900_clockevents_init(rate);
+	nuc900_clocksource_init();
+	nuc900_clockevents_init();
 }
 
 struct sys_timer nuc900_timer = {