PXA: Replace timer driver

This new timer driver shall conform to new Timer API.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>

arch/arm/cpu/pxa/timer.c

@@ -1,11 +1,7 @@
 /*
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
+ * Marvell PXA2xx/3xx timer driver
  *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Alex Zuepke <azu@sysgo.de>
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -31,55 +27,63 @@
 #include <common.h>
 #include <div64.h>
 
-#ifdef CONFIG_USE_IRQ
-#error: interrupts not implemented yet
-#endif
+DECLARE_GLOBAL_DATA_PTR;
+
+#define	TIMER_LOAD_VAL	0xffffffff
+
+#define	timestamp	(gd->tbl)
+#define	lastinc		(gd->lastinc)
 
 #if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
-#define TIMER_FREQ_HZ 3250000
+#define	TIMER_FREQ_HZ	3250000
 #elif defined(CONFIG_CPU_PXA25X)
-#define TIMER_FREQ_HZ 3686400
+#define	TIMER_FREQ_HZ	3686400
 #else
 #error "Timer frequency unknown - please config PXA CPU type"
 #endif
 
-static inline unsigned long long tick_to_time(unsigned long long tick)
+static unsigned long long tick_to_time(unsigned long long tick)
 {
-	tick *= CONFIG_SYS_HZ;
-	do_div(tick, TIMER_FREQ_HZ);
-	return tick;
+	return tick * CONFIG_SYS_HZ / TIMER_FREQ_HZ;
 }
 
-static inline unsigned long long us_to_tick(unsigned long long us)
+static unsigned long long us_to_tick(unsigned long long us)
 {
-	us = us * TIMER_FREQ_HZ + 999999;
-	do_div(us, 1000000);
-	return us;
+	return (us * TIMER_FREQ_HZ) / 1000000;
 }
 
-int timer_init (void)
+int timer_init(void)
 {
 	writel(0, OSCR);
-
 	return 0;
 }
 
-ulong get_timer (ulong base)
-{
-	return get_timer_masked () - base;
-}
-
-void __udelay (unsigned long usec)
+unsigned long long get_ticks(void)
 {
-	udelay_masked (usec);
+	/* Current tick value */
+	uint32_t now = readl(OSCR);
+
+	if (now >= lastinc) {
+		/*
+		 * Normal mode (non roll)
+		 * Move stamp forward with absolute diff ticks
+		 */
+		timestamp += (now - lastinc);
+	} else {
+		/* We have rollover of incrementer */
+		timestamp += (TIMER_LOAD_VAL - lastinc) + now;
+	}
+
+	lastinc = now;
+	return timestamp;
 }
 
-ulong get_timer_masked (void)
+ulong get_timer(ulong base)
 {
-	return tick_to_time(get_ticks());
+	return tick_to_time(get_ticks()) - base;
 }
 
-void udelay_masked (unsigned long usec)
+void __udelay(unsigned long usec)
 {
 	unsigned long long tmp;
 	ulong tmo;
@@ -89,25 +93,4 @@ void udelay_masked (unsigned long usec)
 
 	while (get_ticks() < tmp)	/* loop till event */
 		 /*NOP*/;
-
-}
-
-/*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value.
- */
-unsigned long long get_ticks(void)
-{
-	return readl(OSCR);
-}
-
-/*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
- */
-ulong get_tbclk (void)
-{
-	ulong tbclk;
-	tbclk = TIMER_FREQ_HZ;
-	return tbclk;
 }