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17659d7de9
In some circumstances, reset_timer_masked() was called be timer_init() in order to perform architecture specific timer initialisation. In such cases, the required code in reset_timer_masked() has been moved into timer_init()
182 lines
4.5 KiB
C
182 lines
4.5 KiB
C
/*
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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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*
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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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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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*
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* (C) Copyright 2009
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* Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
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*
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* (C) Copyright 2009 DENX Software Engineering
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* Author: John Rigby <jrigby@gmail.com>
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* Add support for MX25
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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 <common.h>
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#include <div64.h>
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#include <asm/io.h>
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#include <asm/arch/imx-regs.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define timestamp gd->tbl
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#define lastinc gd->lastinc
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/*
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* "time" is measured in 1 / CONFIG_SYS_HZ seconds,
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* "tick" is internal timer period
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*/
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#ifdef CONFIG_MX25_TIMER_HIGH_PRECISION
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/* ~0.4% error - measured with stop-watch on 100s boot-delay */
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static inline 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, CONFIG_MX25_CLK32);
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return tick;
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}
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static inline unsigned long long time_to_tick(unsigned long long time)
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{
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time *= CONFIG_MX25_CLK32;
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do_div(time, CONFIG_SYS_HZ);
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return time;
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}
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static inline unsigned long long us_to_tick(unsigned long long us)
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{
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us = us * CONFIG_MX25_CLK32 + 999999;
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do_div(us, 1000000);
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return us;
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}
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#else
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/* ~2% error */
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#define TICK_PER_TIME ((CONFIG_MX25_CLK32 + CONFIG_SYS_HZ / 2) / \
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CONFIG_SYS_HZ)
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#define US_PER_TICK (1000000 / CONFIG_MX25_CLK32)
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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do_div(tick, TICK_PER_TIME);
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return tick;
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}
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static inline unsigned long long time_to_tick(unsigned long long time)
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{
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return time * TICK_PER_TIME;
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}
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static inline unsigned long long us_to_tick(unsigned long long us)
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{
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us += US_PER_TICK - 1;
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do_div(us, US_PER_TICK);
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return us;
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}
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#endif
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/* nothing really to do with interrupts, just starts up a counter. */
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/* The 32KHz 32-bit timer overruns in 134217 seconds */
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int timer_init(void)
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{
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int i;
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struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
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struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
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/* setup GP Timer 1 */
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writel(GPT_CTRL_SWR, &gpt->ctrl);
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writel(readl(&ccm->cgr1) | CCM_CGR1_GPT1, &ccm->cgr1);
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for (i = 0; i < 100; i++)
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writel(0, &gpt->ctrl); /* We have no udelay by now */
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writel(0, &gpt->pre); /* prescaler = 1 */
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/* Freerun Mode, 32KHz input */
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writel(readl(&gpt->ctrl) | GPT_CTRL_CLKSOURCE_32 | GPT_CTRL_FRR,
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&gpt->ctrl);
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writel(readl(&gpt->ctrl) | GPT_CTRL_TEN, &gpt->ctrl);
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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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struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
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ulong now = readl(&gpt->counter); /* current tick value */
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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 absolut 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 += (0xFFFFFFFF - 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_masked (void)
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{
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/*
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* get_ticks() returns a long long (64 bit), it wraps in
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* 2^64 / CONFIG_MX25_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
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* 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
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* 5 * 10^6 days - long enough.
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*/
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return tick_to_time(get_ticks());
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}
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ulong get_timer (ulong base)
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{
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return get_timer_masked () - base;
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}
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/* delay x useconds AND preserve advance timstamp value */
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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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/*
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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 = CONFIG_MX25_CLK32;
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return tbclk;
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}
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