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102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* Marvell PXA2xx/3xx timer driver
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*
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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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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <asm/arch/pxa-regs.h>
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#include <asm/io.h>
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#include <common.h>
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#include <div64.h>
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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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#elif defined(CONFIG_CPU_PXA25X)
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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 unsigned long long tick_to_time(unsigned long long tick)
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{
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return tick * CONFIG_SYS_HZ / TIMER_FREQ_HZ;
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}
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static unsigned long long us_to_tick(unsigned long long us)
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{
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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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{
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writel(0, OSCR);
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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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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ulong get_timer(ulong base)
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{
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return tick_to_time(get_ticks()) - base;
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}
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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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tmo = us_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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}
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ulong get_tbclk(void)
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{
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return TIMER_FREQ_HZ;
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}
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