ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/uboot/arch/arm/cpu/arm920t/ep93xx/timer.c b/marvell/uboot/arch/arm/cpu/arm920t/ep93xx/timer.c
new file mode 100644
index 0000000..c2f239a
--- /dev/null
+++ b/marvell/uboot/arch/arm/cpu/arm920t/ep93xx/timer.c
@@ -0,0 +1,120 @@
+/*
+ * Cirrus Logic EP93xx timer support.
+ *
+ * Copyright (C) 2009, 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * Copyright (C) 2004, 2005
+ * Cory T. Tusar, Videon Central, Inc., <ctusar@videon-central.com>
+ *
+ * Based on the original intr.c Cirrus Logic EP93xx Rev D. interrupt support,
+ * author unknown.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <asm/arch/ep93xx.h>
+#include <asm/io.h>
+#include <div64.h>
+
+#define TIMER_CLKSEL (1 << 3)
+#define TIMER_ENABLE (1 << 7)
+
+#define TIMER_FREQ 508469 /* ticks / second */
+#define TIMER_MAX_VAL 0xFFFFFFFF
+
+static struct ep93xx_timer
+{
+ unsigned long long ticks;
+ unsigned long last_read;
+} timer;
+
+static inline unsigned long long usecs_to_ticks(unsigned long usecs)
+{
+ unsigned long long ticks = (unsigned long long)usecs * TIMER_FREQ;
+ do_div(ticks, 1000 * 1000);
+
+ return ticks;
+}
+
+static inline void read_timer(void)
+{
+ struct timer_regs *timer_regs = (struct timer_regs *)TIMER_BASE;
+ const unsigned long now = TIMER_MAX_VAL - readl(&timer_regs->timer3.value);
+
+ if (now >= timer.last_read)
+ timer.ticks += now - timer.last_read;
+ else
+ /* an overflow occurred */
+ timer.ticks += TIMER_MAX_VAL - timer.last_read + now;
+
+ timer.last_read = now;
+}
+
+/*
+ * Get the number of ticks (in CONFIG_SYS_HZ resolution)
+ */
+unsigned long long get_ticks(void)
+{
+ unsigned long long sys_ticks;
+
+ read_timer();
+
+ sys_ticks = timer.ticks * CONFIG_SYS_HZ;
+ do_div(sys_ticks, TIMER_FREQ);
+
+ return sys_ticks;
+}
+
+unsigned long get_timer_masked(void)
+{
+ return get_ticks();
+}
+
+unsigned long get_timer(unsigned long base)
+{
+ return get_timer_masked() - base;
+}
+
+void __udelay(unsigned long usec)
+{
+ unsigned long long target;
+
+ read_timer();
+
+ target = timer.ticks + usecs_to_ticks(usec);
+
+ while (timer.ticks < target)
+ read_timer();
+}
+
+int timer_init(void)
+{
+ struct timer_regs *timer_regs = (struct timer_regs *)TIMER_BASE;
+
+ /* use timer 3 with 508KHz and free running, not enabled now */
+ writel(TIMER_CLKSEL, &timer_regs->timer3.control);
+
+ /* set initial timer value */
+ writel(TIMER_MAX_VAL, &timer_regs->timer3.load);
+
+ /* Enable the timer */
+ writel(TIMER_ENABLE | TIMER_CLKSEL,
+ &timer_regs->timer3.control);
+
+ /* Reset the timer */
+ read_timer();
+ timer.ticks = 0;
+
+ return 0;
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+unsigned long get_tbclk(void)
+{
+ return CONFIG_SYS_HZ;
+}