1 files changed, 113 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/timer.c b/arch/arm/cpu/armv7/sunxi/timer.c
new file mode 100644
index 000000000..36263896d
--- /dev/null
+++ b/arch/arm/cpu/armv7/sunxi/timer.c
@@ -0,0 +1,113 @@
+/*
+ * (C) Copyright 2007-2011
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/timer.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define TIMER_MODE   (0x0 << 7)	/* continuous mode */
+#define TIMER_DIV    (0x0 << 4)	/* pre scale 1 */
+#define TIMER_SRC    (0x1 << 2)	/* osc24m */
+#define TIMER_RELOAD (0x1 << 1)	/* reload internal value */
+#define TIMER_EN     (0x1 << 0)	/* enable timer */
+
+#define TIMER_CLOCK		(24 * 1000 * 1000)
+#define COUNT_TO_USEC(x)	((x) / 24)
+#define USEC_TO_COUNT(x)	((x) * 24)
+#define TICKS_PER_HZ		(TIMER_CLOCK / CONFIG_SYS_HZ)
+#define TICKS_TO_HZ(x)		((x) / TICKS_PER_HZ)
+
+#define TIMER_LOAD_VAL		0xffffffff
+
+#define TIMER_NUM		0	/* we use timer 0 */
+
+/* read the 32-bit timer */
+static ulong read_timer(void)
+{
+	struct sunxi_timer_reg *timers =
+		(struct sunxi_timer_reg *)SUNXI_TIMER_BASE;
+	struct sunxi_timer *timer = &timers->timer[TIMER_NUM];
+
+	/*
+	 * The hardware timer counts down, therefore we invert to
+	 * produce an incrementing timer.
+	 */
+	return ~readl(&timer->val);
+}
+
+/* init timer register */
+int timer_init(void)
+{
+	struct sunxi_timer_reg *timers =
+		(struct sunxi_timer_reg *)SUNXI_TIMER_BASE;
+	struct sunxi_timer *timer = &timers->timer[TIMER_NUM];
+	writel(TIMER_LOAD_VAL, &timer->inter);
+	writel(TIMER_MODE | TIMER_DIV | TIMER_SRC | TIMER_RELOAD | TIMER_EN,
+	       &timer->ctl);
+
+	return 0;
+}
+
+/* timer without interrupts */
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+ulong get_timer_masked(void)
+{
+	/* current tick value */
+	ulong now = TICKS_TO_HZ(read_timer());
+
+	if (now >= gd->arch.lastinc)	/* normal (non rollover) */
+		gd->arch.tbl += (now - gd->arch.lastinc);
+	else {
+		/* rollover */
+		gd->arch.tbl += (TICKS_TO_HZ(TIMER_LOAD_VAL)
+				- gd->arch.lastinc) + now;
+	}
+	gd->arch.lastinc = now;
+
+	return gd->arch.tbl;
+}
+
+/* delay x useconds */
+void __udelay(unsigned long usec)
+{
+	long tmo = USEC_TO_COUNT(usec);
+	ulong now, last = read_timer();
+
+	while (tmo > 0) {
+		now = read_timer();
+		if (now > last)	/* normal (non rollover) */
+			tmo -= now - last;
+		else		/* rollover */
+			tmo -= TIMER_LOAD_VAL - last + now;
+		last = now;
+	}
+}
+
+/*
+ * 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 get_timer(0);
+}
+
+/*
+ * 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)
+{
+	return CONFIG_SYS_HZ;
+}