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wdenk32fe2872002-10-11 07:57:01 +00001/*
2 * (C) Copyright 2002
3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
5 *
6 * (C) Copyright 2002
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
9 *
10 * See file CREDITS for list of people who contributed to this
11 * project.
12 *
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.
17 *
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.
22 *
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,
26 * MA 02111-1307 USA
27 */
28
29#include <common.h>
30#include <asm/arch/pxa-regs.h>
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +010031#include <div64.h>
wdenk32fe2872002-10-11 07:57:01 +000032
wdenk32fe2872002-10-11 07:57:01 +000033#ifdef CONFIG_USE_IRQ
wdenk32fe2872002-10-11 07:57:01 +000034#error: interrupts not implemented yet
wdenk32fe2872002-10-11 07:57:01 +000035#endif
36
Micha Kalfon94a33122009-02-11 19:50:11 +020037#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
41#else
42#error "Timer frequency unknown - please config PXA CPU type"
43#endif
44
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +010045static inline unsigned long long tick_to_time(unsigned long long tick)
46{
47 tick *= CONFIG_SYS_HZ;
48 do_div(tick, TIMER_FREQ_HZ);
49 return tick;
50}
51
52static inline unsigned long long us_to_tick(unsigned long long us)
53{
54 us = us * TIMER_FREQ_HZ + 999999;
55 do_div(us, 1000000);
56 return us;
57}
58
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +020059int timer_init (void)
wdenk32fe2872002-10-11 07:57:01 +000060{
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +020061 reset_timer();
62
63 return 0;
wdenk32fe2872002-10-11 07:57:01 +000064}
65
66void reset_timer (void)
67{
68 reset_timer_masked ();
69}
70
71ulong get_timer (ulong base)
72{
wdenkf39748a2004-06-09 13:37:52 +000073 return get_timer_masked () - base;
wdenk32fe2872002-10-11 07:57:01 +000074}
75
76void set_timer (ulong t)
77{
78 /* nop */
79}
80
81void udelay (unsigned long usec)
82{
83 udelay_masked (usec);
84}
85
86
87void reset_timer_masked (void)
88{
89 OSCR = 0;
90}
91
92ulong get_timer_masked (void)
93{
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +010094 return tick_to_time(get_ticks());
wdenk32fe2872002-10-11 07:57:01 +000095}
96
97void udelay_masked (unsigned long usec)
98{
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +010099 unsigned long long tmp;
wdenk32fe2872002-10-11 07:57:01 +0000100 ulong tmo;
101
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +0100102 tmo = us_to_tick(usec);
103 tmp = get_ticks() + tmo; /* get current timestamp */
wdenk32fe2872002-10-11 07:57:01 +0000104
Jean-Christophe PLAGNIOL-VILLARDa922fdb2009-02-24 06:13:10 +0100105 while (get_ticks() < tmp) /* loop till event */
106 /*NOP*/;
wdenk32fe2872002-10-11 07:57:01 +0000107
wdenk32fe2872002-10-11 07:57:01 +0000108}
wdenkfc3e2162003-10-08 22:33:00 +0000109
110/*
111 * This function is derived from PowerPC code (read timebase as long long).
112 * On ARM it just returns the timer value.
113 */
114unsigned long long get_ticks(void)
115{
Micha Kalfon94a33122009-02-11 19:50:11 +0200116 return OSCR;
wdenkfc3e2162003-10-08 22:33:00 +0000117}
118
119/*
120 * This function is derived from PowerPC code (timebase clock frequency).
121 * On ARM it returns the number of timer ticks per second.
122 */
123ulong get_tbclk (void)
124{
125 ulong tbclk;
Micha Kalfon94a33122009-02-11 19:50:11 +0200126 tbclk = TIMER_FREQ_HZ;
wdenkfc3e2162003-10-08 22:33:00 +0000127 return tbclk;
128}