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Diffstat (limited to 'cpu/arm926ejs/mx25/timer.c')
| -rw-r--r-- | cpu/arm926ejs/mx25/timer.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/cpu/arm926ejs/mx25/timer.c b/cpu/arm926ejs/mx25/timer.c deleted file mode 100644 index 11d41a8..0000000 --- a/cpu/arm926ejs/mx25/timer.c +++ /dev/null @@ -1,187 +0,0 @@ -/* - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Marius Groeger <mgroeger@sysgo.de> - * - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Alex Zuepke <azu@sysgo.de> - * - * (C) Copyright 2002 - * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> - * - * (C) Copyright 2009 - * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com> - * - * (C) Copyright 2009 DENX Software Engineering - * Author: John Rigby <jrigby@gmail.com> - * Add support for MX25 - * - * 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 - */ - -#include <common.h> -#include <div64.h> -#include <asm/io.h> -#include <asm/arch/imx-regs.h> - -static ulong timestamp; -static ulong lastinc; - -/* - * "time" is measured in 1 / CONFIG_SYS_HZ seconds, - * "tick" is internal timer period - */ -#ifdef CONFIG_MX25_TIMER_HIGH_PRECISION -/* ~0.4% error - measured with stop-watch on 100s boot-delay */ -static inline unsigned long long tick_to_time(unsigned long long tick) -{ - tick *= CONFIG_SYS_HZ; - do_div(tick, CONFIG_MX25_CLK32); - return tick; -} - -static inline unsigned long long time_to_tick(unsigned long long time) -{ - time *= CONFIG_MX25_CLK32; - do_div(time, CONFIG_SYS_HZ); - return time; -} - -static inline unsigned long long us_to_tick(unsigned long long us) -{ - us = us * CONFIG_MX25_CLK32 + 999999; - do_div(us, 1000000); - return us; -} -#else -/* ~2% error */ -#define TICK_PER_TIME ((CONFIG_MX25_CLK32 + CONFIG_SYS_HZ / 2) / \ - CONFIG_SYS_HZ) -#define US_PER_TICK (1000000 / CONFIG_MX25_CLK32) - -static inline unsigned long long tick_to_time(unsigned long long tick) -{ - do_div(tick, TICK_PER_TIME); - return tick; -} - -static inline unsigned long long time_to_tick(unsigned long long time) -{ - return time * TICK_PER_TIME; -} - -static inline unsigned long long us_to_tick(unsigned long long us) -{ - us += US_PER_TICK - 1; - do_div(us, US_PER_TICK); - return us; -} -#endif - -/* nothing really to do with interrupts, just starts up a counter. */ -/* The 32KHz 32-bit timer overruns in 134217 seconds */ -int timer_init(void) -{ - int i; - struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE; - struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE; - - /* setup GP Timer 1 */ - writel(GPT_CTRL_SWR, &gpt->ctrl); - - writel(readl(&ccm->cgr1) | CCM_CGR1_GPT1, &ccm->cgr1); - - for (i = 0; i < 100; i++) - writel(0, &gpt->ctrl); /* We have no udelay by now */ - writel(0, &gpt->pre); /* prescaler = 1 */ - /* Freerun Mode, 32KHz input */ - writel(readl(&gpt->ctrl) | GPT_CTRL_CLKSOURCE_32 | GPT_CTRL_FRR, - &gpt->ctrl); - writel(readl(&gpt->ctrl) | GPT_CTRL_TEN, &gpt->ctrl); - - return 0; -} - -void reset_timer_masked(void) -{ - struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE; - /* reset time */ - /* capture current incrementer value time */ - lastinc = readl(&gpt->counter); - timestamp = 0; /* start "advancing" time stamp from 0 */ -} - -void reset_timer(void) -{ - reset_timer_masked(); -} - -unsigned long long get_ticks (void) -{ - struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE; - ulong now = readl(&gpt->counter); /* current tick value */ - - if (now >= lastinc) { - /* - * normal mode (non roll) - * move stamp forward with absolut diff ticks - */ - timestamp += (now - lastinc); - } else { - /* we have rollover of incrementer */ - timestamp += (0xFFFFFFFF - lastinc) + now; - } - lastinc = now; - return timestamp; -} - -ulong get_timer_masked (void) -{ - /* - * get_ticks() returns a long long (64 bit), it wraps in - * 2^64 / CONFIG_MX25_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~ - * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in - * 5 * 10^6 days - long enough. - */ - return tick_to_time(get_ticks()); -} - -ulong get_timer (ulong base) -{ - return get_timer_masked () - base; -} - -void set_timer (ulong t) -{ - timestamp = time_to_tick(t); -} - -/* delay x useconds AND preserve advance timstamp value */ -void __udelay (unsigned long usec) -{ - unsigned long long tmp; - ulong tmo; - - tmo = us_to_tick(usec); - tmp = get_ticks() + tmo; /* get current timestamp */ - - while (get_ticks() < tmp) /* loop till event */ - /*NOP*/; -} |