151 lines
2.8 KiB
C
151 lines
2.8 KiB
C
/*
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* (C) Copyright 2006
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* Mindspeed Technologies, Inc. <www.mindspeed.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/arch/bsp.h>
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#include <asm/hardware.h>
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#define TIMER_LOAD_VAL 0x00ffffff
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#define CLOCK_COUNT_PER_USEC (CONFIG_SYS_HZ_CLOCK / 1000 / 1000)
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#define USEC_PER_TICK (1000 * 1000 / CONFIG_SYS_HZ)
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#define READ_TIMER SoC_timer0_get()
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static ulong ts_count, ts_usec;
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static ulong lastdec;
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int interrupt_init (void)
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{
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SoC_timer0_set(TIMER_LOAD_VAL);
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lastdec = TIMER_LOAD_VAL;
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ts_count = 0;
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ts_usec = 0;
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return (0);
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}
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void reset_timer_masked (void)
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{
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lastdec = READ_TIMER;
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ts_count = 0;
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ts_usec = 0;
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}
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void reset_timer (void)
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{
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reset_timer_masked ();
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}
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/* Returns usecs since last timer reset */
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ulong get_timer_raw (void)
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{
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ulong step;
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ulong now = READ_TIMER;
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if (now < lastdec) {
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/* normal mode */
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step = lastdec - now;
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} else {
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/* we have an overflow ... */
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step = (TIMER_LOAD_VAL - now) + lastdec;
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}
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lastdec = now;
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ts_count += step % CLOCK_COUNT_PER_USEC;
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ts_usec += step / CLOCK_COUNT_PER_USEC;
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if (ts_count >= CLOCK_COUNT_PER_USEC) {
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ts_usec += ts_count / CLOCK_COUNT_PER_USEC;
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ts_count %= CLOCK_COUNT_PER_USEC;
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}
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return ts_usec;
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}
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/* Returns tick count since last timer reset */
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ulong get_timer_masked (void)
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{
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return get_timer_raw() / USEC_PER_TICK;
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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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void udelay_masked (unsigned long usec)
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{
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ulong endtime = get_timer_raw () + usec;
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while (get_timer_raw () < endtime)
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;
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}
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void udelay (unsigned long usec)
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{
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udelay_masked(usec);
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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 get_timer(0);
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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_SYS_HZ;
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return tbclk;
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}
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/*
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*
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*/
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void reset_cpu (ulong ignored)
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{
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while (1);
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/* Never reached */
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}
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/*
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* timer without interrupts
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*/
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void set_timer (ulong t)
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{
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ts_count = 0;
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ts_usec = t * USEC_PER_TICK;
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}
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