| /* |
| * (C) Copyright 2010,2011 |
| * NVIDIA Corporation <www.nvidia.com> |
| * |
| * (C) Copyright 2008 |
| * Texas Instruments |
| * |
| * Richard Woodruff <r-woodruff2@ti.com> |
| * Syed Moahmmed Khasim <khasim@ti.com> |
| * |
| * (C) Copyright 2002 |
| * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| * Marius Groeger <mgroeger@sysgo.de> |
| * Alex Zuepke <azu@sysgo.de> |
| * |
| * (C) Copyright 2002 |
| * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <asm/arch/tegra2.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE; |
| |
| /* counter runs at 1MHz */ |
| #define TIMER_CLK (1000000) |
| #define TIMER_LOAD_VAL 0xffffffff |
| |
| /* timer without interrupts */ |
| void reset_timer(void) |
| { |
| reset_timer_masked(); |
| } |
| |
| ulong get_timer(ulong base) |
| { |
| return get_timer_masked() - base; |
| } |
| |
| void set_timer(ulong t) |
| { |
| gd->tbl = t; |
| } |
| |
| /* delay x useconds */ |
| void __udelay(unsigned long usec) |
| { |
| long tmo = usec * (TIMER_CLK / 1000) / 1000; |
| unsigned long now, last = readl(&timer_base->cntr_1us); |
| |
| while (tmo > 0) { |
| now = readl(&timer_base->cntr_1us); |
| if (last > now) /* count up timer overflow */ |
| tmo -= TIMER_LOAD_VAL - last + now; |
| else |
| tmo -= now - last; |
| last = now; |
| } |
| } |
| |
| void reset_timer_masked(void) |
| { |
| /* reset time, capture current incrementer value time */ |
| gd->lastinc = readl(&timer_base->cntr_1us) / (TIMER_CLK/CONFIG_SYS_HZ); |
| gd->tbl = 0; /* start "advancing" time stamp from 0 */ |
| } |
| |
| ulong get_timer_masked(void) |
| { |
| ulong now; |
| |
| /* current tick value */ |
| now = readl(&timer_base->cntr_1us) / (TIMER_CLK / CONFIG_SYS_HZ); |
| |
| if (now >= gd->lastinc) /* normal mode (non roll) */ |
| /* move stamp forward with absolute diff ticks */ |
| gd->tbl += (now - gd->lastinc); |
| else /* we have rollover of incrementer */ |
| gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ)) |
| - gd->lastinc) + now; |
| gd->lastinc = now; |
| return gd->tbl; |
| } |
| |
| /* |
| * This function is derived from PowerPC code (read timebase as long long). |
| * On ARM it just returns the timer value. |
| */ |
| unsigned long long get_ticks(void) |
| { |
| return get_timer(0); |
| } |
| |
| /* |
| * This function is derived from PowerPC code (timebase clock frequency). |
| * On ARM it returns the number of timer ticks per second. |
| */ |
| ulong get_tbclk(void) |
| { |
| return CONFIG_SYS_HZ; |
| } |