/*
- * (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.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/arch/pxa-regs.h>
#include <common.h>
#include <div64.h>
-#ifdef CONFIG_USE_IRQ
-#error: interrupts not implemented yet
-#endif
+DECLARE_GLOBAL_DATA_PTR;
-#if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
-#define TIMER_FREQ_HZ 3250000
-#elif defined(CONFIG_PXA250)
-#define TIMER_FREQ_HZ 3686400
+#define TIMER_LOAD_VAL 0xffffffff
+
+#define timestamp (gd->arch.tbl)
+#define lastinc (gd->arch.lastinc)
+
+#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+#define TIMER_FREQ_HZ 3250000
+#elif defined(CONFIG_CPU_PXA25X)
+#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 lldiv(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 lldiv(us * TIMER_FREQ_HZ, 1000000);
}
-int timer_init (void)
+int timer_init(void)
{
- reset_timer();
-
+ writel(0, OSCR);
return 0;
}
-void reset_timer (void)
-{
- reset_timer_masked ();
-}
-
-ulong get_timer (ulong base)
-{
- return get_timer_masked () - base;
-}
-
-void set_timer (ulong t)
-{
- /* nop */
-}
-
-void __udelay (unsigned long usec)
-{
- udelay_masked (usec);
-}
-
-
-void reset_timer_masked (void)
+unsigned long long get_ticks(void)
{
- writel(0, OSCR);
+ /* 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;
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 get_tbclk(void)
{
- ulong tbclk;
- tbclk = TIMER_FREQ_HZ;
- return tbclk;
+ return TIMER_FREQ_HZ;
}