3 * Texas Instruments <www.ti.com>
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
13 * (C) Copyright 2002-2004
14 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
17 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
19 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
21 * See file CREDITS for list of people who contributed to this
24 * This program is free software; you can redistribute it and/or
25 * modify it under the terms of the GNU General Public License as
26 * published by the Free Software Foundation; either version 2 of
27 * the License, or (at your option) any later version.
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
43 DECLARE_GLOBAL_DATA_PTR;
45 struct davinci_timer {
59 static struct davinci_timer * const timer =
60 (struct davinci_timer *)CONFIG_SYS_TIMERBASE;
62 #define TIMER_LOAD_VAL 0xffffffff
64 #define TIM_CLK_DIV 16
68 /* We are using timer34 in unchained 32-bit mode, full speed */
69 writel(0x0, &timer->tcr);
70 writel(0x0, &timer->tgcr);
71 writel(0x06 | ((TIM_CLK_DIV - 1) << 8), &timer->tgcr);
72 writel(0x0, &timer->tim34);
73 writel(TIMER_LOAD_VAL, &timer->prd34);
74 writel(2 << 22, &timer->tcr);
75 gd->timer_rate_hz = CONFIG_SYS_HZ_CLOCK / TIM_CLK_DIV;
76 gd->timer_reset_value = 0;
82 * Get the current 64 bit timer tick count
84 unsigned long long get_ticks(void)
86 unsigned long now = readl(&timer->tim34);
88 /* increment tbu if tbl has rolled over */
93 return (((unsigned long long)gd->tbu) << 32) | gd->tbl;
96 ulong get_timer(ulong base)
98 unsigned long long timer_diff;
100 timer_diff = get_ticks() - gd->timer_reset_value;
102 return (timer_diff / (gd->timer_rate_hz / CONFIG_SYS_HZ)) - base;
105 void __udelay(unsigned long usec)
107 unsigned long long endtime;
109 endtime = ((unsigned long long)usec * gd->timer_rate_hz) / 1000000UL;
110 endtime += get_ticks();
112 while (get_ticks() < endtime)
117 * This function is derived from PowerPC code (timebase clock frequency).
118 * On ARM it returns the number of timer ticks per second.
120 ulong get_tbclk(void)
122 return CONFIG_SYS_HZ;