2 * (C) Copyright 2010,2011
3 * NVIDIA Corporation <www.nvidia.com>
8 * Richard Woodruff <r-woodruff2@ti.com>
9 * Syed Moahmmed Khasim <khasim@ti.com>
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
14 * Alex Zuepke <azu@sysgo.de>
17 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
19 * See file CREDITS for list of people who contributed to this
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.
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
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,
40 #include <asm/arch/tegra2.h>
42 DECLARE_GLOBAL_DATA_PTR;
44 struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE;
46 /* counter runs at 1MHz */
47 #define TIMER_CLK (1000000)
48 #define TIMER_LOAD_VAL 0xffffffff
50 /* timer without interrupts */
51 void reset_timer(void)
56 ulong get_timer(ulong base)
58 return get_timer_masked() - base;
61 void set_timer(ulong t)
66 /* delay x useconds */
67 void __udelay(unsigned long usec)
69 long tmo = usec * (TIMER_CLK / 1000) / 1000;
70 unsigned long now, last = readl(&timer_base->cntr_1us);
73 now = readl(&timer_base->cntr_1us);
74 if (last > now) /* count up timer overflow */
75 tmo -= TIMER_LOAD_VAL - last + now;
82 void reset_timer_masked(void)
84 /* reset time, capture current incrementer value time */
85 gd->lastinc = readl(&timer_base->cntr_1us) / (TIMER_CLK/CONFIG_SYS_HZ);
86 gd->tbl = 0; /* start "advancing" time stamp from 0 */
89 ulong get_timer_masked(void)
93 /* current tick value */
94 now = readl(&timer_base->cntr_1us) / (TIMER_CLK / CONFIG_SYS_HZ);
96 if (now >= gd->lastinc) /* normal mode (non roll) */
97 /* move stamp forward with absolute diff ticks */
98 gd->tbl += (now - gd->lastinc);
99 else /* we have rollover of incrementer */
100 gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ))
101 - gd->lastinc) + now;
107 * This function is derived from PowerPC code (read timebase as long long).
108 * On ARM it just returns the timer value.
110 unsigned long long get_ticks(void)
116 * This function is derived from PowerPC code (timebase clock frequency).
117 * On ARM it returns the number of timer ticks per second.
119 ulong get_tbclk(void)
121 return CONFIG_SYS_HZ;