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PXA: Replace timer driver
This new timer driver shall conform to new Timer API. Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
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1 changed files with 35 additions and 52 deletions
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@ -1,11 +1,7 @@
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/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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* Marvell PXA2xx/3xx timer driver
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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@ -31,55 +27,63 @@
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#include <common.h>
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#include <div64.h>
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#ifdef CONFIG_USE_IRQ
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#error: interrupts not implemented yet
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#define TIMER_LOAD_VAL 0xffffffff
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#define timestamp (gd->tbl)
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#define lastinc (gd->lastinc)
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#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
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#define TIMER_FREQ_HZ 3250000
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#define TIMER_FREQ_HZ 3250000
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#elif defined(CONFIG_CPU_PXA25X)
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#define TIMER_FREQ_HZ 3686400
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#define TIMER_FREQ_HZ 3686400
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#else
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#error "Timer frequency unknown - please config PXA CPU type"
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#endif
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static inline unsigned long long tick_to_time(unsigned long long tick)
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static unsigned long long tick_to_time(unsigned long long tick)
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{
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tick *= CONFIG_SYS_HZ;
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do_div(tick, TIMER_FREQ_HZ);
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return tick;
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return tick * CONFIG_SYS_HZ / TIMER_FREQ_HZ;
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}
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static inline unsigned long long us_to_tick(unsigned long long us)
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static unsigned long long us_to_tick(unsigned long long us)
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{
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us = us * TIMER_FREQ_HZ + 999999;
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do_div(us, 1000000);
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return us;
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return (us * TIMER_FREQ_HZ) / 1000000;
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}
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int timer_init (void)
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int timer_init(void)
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{
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writel(0, OSCR);
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return 0;
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}
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ulong get_timer (ulong base)
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unsigned long long get_ticks(void)
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{
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return get_timer_masked () - base;
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/* Current tick value */
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uint32_t now = readl(OSCR);
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if (now >= lastinc) {
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/*
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* Normal mode (non roll)
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* Move stamp forward with absolute diff ticks
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*/
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timestamp += (now - lastinc);
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} else {
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/* We have rollover of incrementer */
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timestamp += (TIMER_LOAD_VAL - lastinc) + now;
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}
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lastinc = now;
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return timestamp;
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}
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void __udelay (unsigned long usec)
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ulong get_timer(ulong base)
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{
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udelay_masked (usec);
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return tick_to_time(get_ticks()) - base;
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}
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ulong get_timer_masked (void)
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{
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return tick_to_time(get_ticks());
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}
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void udelay_masked (unsigned long usec)
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void __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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ulong tmo;
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@ -89,25 +93,4 @@ void udelay_masked (unsigned long usec)
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return readl(OSCR);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk (void)
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{
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ulong tbclk;
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tbclk = TIMER_FREQ_HZ;
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return tbclk;
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}
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