/* * (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> * * 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 <asm/arch/pxa-regs.h> #include <div64.h> #ifdef CONFIG_USE_IRQ #error: interrupts not implemented yet #endif #if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) #define TIMER_FREQ_HZ 3250000 #elif defined(CONFIG_PXA250) #define TIMER_FREQ_HZ 3686400 #else #error "Timer frequency unknown - please config PXA CPU type" #endif static inline unsigned long long tick_to_time(unsigned long long tick) { tick *= CONFIG_SYS_HZ; do_div(tick, TIMER_FREQ_HZ); return tick; } static inline unsigned long long us_to_tick(unsigned long long us) { us = us * TIMER_FREQ_HZ + 999999; do_div(us, 1000000); return us; } int timer_init (void) { reset_timer(); return 0; } void reset_timer (void) { reset_timer_masked (); } ulong get_timer (ulong base) { return get_timer_masked () - base; } void set_timer (ulong t) { /* nop */ } void udelay (unsigned long usec) { udelay_masked (usec); } void reset_timer_masked (void) { OSCR = 0; } ulong get_timer_masked (void) { return tick_to_time(get_ticks()); } void udelay_masked (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*/; } /* * This function is derived from PowerPC code (read timebase as long long). * On ARM it just returns the timer value. */ unsigned long long get_ticks(void) { return OSCR; } /* * This function is derived from PowerPC code (timebase clock frequency). * On ARM it returns the number of timer ticks per second. */ ulong get_tbclk (void) { ulong tbclk; tbclk = TIMER_FREQ_HZ; return tbclk; }