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wdenk2e5983d2003-07-15 20:04:06 +00001/*
Ladislav Michl3791a112009-04-22 01:12:04 +02002 * (C) Copyright 2009
3 * 2N Telekomunikace, <www.2n.cz>
4 *
wdenk2e5983d2003-07-15 20:04:06 +00005 * (C) Copyright 2003
6 * Texas Instruments, <www.ti.com>
7 *
8 * (C) Copyright 2002
9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10 * Marius Groeger <mgroeger@sysgo.de>
11 *
12 * (C) Copyright 2002
13 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
14 * Alex Zuepke <azu@sysgo.de>
15 *
16 * (C) Copyright 2002
Detlev Zundel792a09e2009-05-13 10:54:10 +020017 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
wdenk2e5983d2003-07-15 20:04:06 +000018 *
19 * See file CREDITS for list of people who contributed to this
20 * project.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License as
24 * published by the Free Software Foundation; either version 2 of
25 * the License, or (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wdenk232c1502004-03-12 00:14:09 +000029 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wdenk2e5983d2003-07-15 20:04:06 +000030 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 * MA 02111-1307 USA
36 */
37
38#include <common.h>
39#include <arm925t.h>
40#include <configs/omap1510.h>
Ladislav Michl89c00fb2009-03-30 18:58:41 +020041#include <asm/io.h>
wdenk2e5983d2003-07-15 20:04:06 +000042
Ladislav Michl3791a112009-04-22 01:12:04 +020043#define TIMER_LOAD_VAL 0xffffffff
44#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
wdenk2e5983d2003-07-15 20:04:06 +000045
Ladislav Michl89c00fb2009-03-30 18:58:41 +020046static uint32_t timestamp;
47static uint32_t lastdec;
wdenk2e5983d2003-07-15 20:04:06 +000048
49/* nothing really to do with interrupts, just starts up a counter. */
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +020050int timer_init (void)
wdenk2e5983d2003-07-15 20:04:06 +000051{
wdenka3ad8e22003-10-19 23:22:11 +000052 /* Start the decrementer ticking down from 0xffffffff */
Ladislav Michl89c00fb2009-03-30 18:58:41 +020053 __raw_writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + LOAD_TIM);
54 __raw_writel(MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE |
55 (CONFIG_SYS_PTV << MPUTIM_PTV_BIT),
56 CONFIG_SYS_TIMERBASE + CNTL_TIMER);
wdenka3ad8e22003-10-19 23:22:11 +000057
58 /* init the timestamp and lastdec value */
Graeme Russ17659d72011-07-15 02:21:14 +000059 lastdec = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
60 (TIMER_CLOCK / CONFIG_SYS_HZ);
61 timestamp = 0; /* start "advancing" time stamp from 0 */
wdenka3ad8e22003-10-19 23:22:11 +000062
Ladislav Michlfe672d62009-03-30 18:58:40 +020063 return 0;
wdenk2e5983d2003-07-15 20:04:06 +000064}
65
66/*
67 * timer without interrupts
68 */
wdenk2e5983d2003-07-15 20:04:06 +000069ulong get_timer (ulong base)
70{
71 return get_timer_masked () - base;
72}
73
wdenk0b8fa032004-04-25 14:37:29 +000074/* delay x useconds AND preserve advance timestamp value */
Ingo van Lil3eb90ba2009-11-24 14:09:21 +010075void __udelay (unsigned long usec)
wdenk2e5983d2003-07-15 20:04:06 +000076{
Ladislav Michl3791a112009-04-22 01:12:04 +020077 int32_t tmo = usec * (TIMER_CLOCK / 1000) / 1000;
78 uint32_t now, last = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
wdenk2e5983d2003-07-15 20:04:06 +000079
Ladislav Michl3791a112009-04-22 01:12:04 +020080 while (tmo > 0) {
81 now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
82 if (last < now) /* count down timer underflow */
83 tmo -= TIMER_LOAD_VAL - now + last;
84 else
85 tmo -= last - now;
86 last = now;
wdenka3ad8e22003-10-19 23:22:11 +000087 }
wdenk2e5983d2003-07-15 20:04:06 +000088}
89
wdenk2e5983d2003-07-15 20:04:06 +000090ulong get_timer_masked (void)
91{
Ladislav Michl3791a112009-04-22 01:12:04 +020092 uint32_t now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
93 (TIMER_CLOCK / CONFIG_SYS_HZ);
94 if (lastdec < now) /* count down timer underflow */
95 timestamp += TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ) -
96 now + lastdec;
97 else
98 timestamp += lastdec - now;
wdenk2e5983d2003-07-15 20:04:06 +000099 lastdec = now;
100
101 return timestamp;
102}
103
wdenk2e5983d2003-07-15 20:04:06 +0000104/*
105 * This function is derived from PowerPC code (read timebase as long long).
106 * On ARM it just returns the timer value.
107 */
108unsigned long long get_ticks(void)
109{
110 return get_timer(0);
111}
112
113/*
114 * This function is derived from PowerPC code (timebase clock frequency).
115 * On ARM it returns the number of timer ticks per second.
116 */
117ulong get_tbclk (void)
wdenka3ad8e22003-10-19 23:22:11 +0000118{
Ladislav Michlfe672d62009-03-30 18:58:40 +0200119 return CONFIG_SYS_HZ;
wdenk2e5983d2003-07-15 20:04:06 +0000120}