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,
30 #include <asm/arch/pxa-regs.h>
34 #error: interrupts not implemented yet
37 #if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS)
38 #define TIMER_FREQ_HZ 3250000
39 #elif defined(CONFIG_PXA250)
40 #define TIMER_FREQ_HZ 3686400
42 #error "Timer frequency unknown - please config PXA CPU type"
45 static inline unsigned long long tick_to_time(unsigned long long tick)
47 tick *= CONFIG_SYS_HZ;
48 do_div(tick, TIMER_FREQ_HZ);
52 static inline unsigned long long us_to_tick(unsigned long long us)
54 us = us * TIMER_FREQ_HZ + 999999;
59 int interrupt_init (void)
61 /* nothing happens here - we don't setup any IRQs */
65 void reset_timer (void)
67 reset_timer_masked ();
70 ulong get_timer (ulong base)
72 return get_timer_masked () - base;
75 void set_timer (ulong t)
80 void udelay (unsigned long usec)
86 void reset_timer_masked (void)
91 ulong get_timer_masked (void)
93 return tick_to_time(get_ticks());
96 void udelay_masked (unsigned long usec)
98 unsigned long long tmp;
101 tmo = us_to_tick(usec);
102 tmp = get_ticks() + tmo; /* get current timestamp */
104 while (get_ticks() < tmp) /* loop till event */
110 * This function is derived from PowerPC code (read timebase as long long).
111 * On ARM it just returns the timer value.
113 unsigned long long get_ticks(void)
119 * This function is derived from PowerPC code (timebase clock frequency).
120 * On ARM it returns the number of timer ticks per second.
122 ulong get_tbclk (void)
125 tbclk = TIMER_FREQ_HZ;