3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
10 * See file CREDITS for list of people who contributed to this
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 #include <asm/arch/pxa-regs.h>
35 #error: interrupts not implemented yet
38 #if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
39 #define TIMER_FREQ_HZ 3250000
40 #elif defined(CONFIG_PXA250)
41 #define TIMER_FREQ_HZ 3686400
43 #error "Timer frequency unknown - please config PXA CPU type"
46 static inline unsigned long long tick_to_time(unsigned long long tick)
48 tick *= CONFIG_SYS_HZ;
49 do_div(tick, TIMER_FREQ_HZ);
53 static inline unsigned long long us_to_tick(unsigned long long us)
55 us = us * TIMER_FREQ_HZ + 999999;
67 ulong get_timer (ulong base)
69 return get_timer_masked () - base;
72 void __udelay (unsigned long usec)
77 ulong get_timer_masked (void)
79 return tick_to_time(get_ticks());
82 void udelay_masked (unsigned long usec)
84 unsigned long long tmp;
87 tmo = us_to_tick(usec);
88 tmp = get_ticks() + tmo; /* get current timestamp */
90 while (get_ticks() < tmp) /* loop till event */
96 * This function is derived from PowerPC code (read timebase as long long).
97 * On ARM it just returns the timer value.
99 unsigned long long get_ticks(void)
105 * This function is derived from PowerPC code (timebase clock frequency).
106 * On ARM it returns the number of timer ticks per second.
108 ulong get_tbclk (void)
111 tbclk = TIMER_FREQ_HZ;