| Tom Warren | 41b6838 | 2011-01-27 10:58:05 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2010,2011 |
| 3 | * NVIDIA Corporation <www.nvidia.com> |
| 4 | * |
| 5 | * (C) Copyright 2008 |
| 6 | * Texas Instruments |
| 7 | * |
| 8 | * Richard Woodruff <r-woodruff2@ti.com> |
| 9 | * Syed Moahmmed Khasim <khasim@ti.com> |
| 10 | * |
| 11 | * (C) Copyright 2002 |
| 12 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 13 | * Marius Groeger <mgroeger@sysgo.de> |
| 14 | * Alex Zuepke <azu@sysgo.de> |
| 15 | * |
| 16 | * (C) Copyright 2002 |
| 17 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
| 18 | * |
| 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 |
| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 30 | * 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 <asm/io.h> |
| 40 | #include <asm/arch/tegra2.h> |
| 41 | |
| 42 | DECLARE_GLOBAL_DATA_PTR; |
| 43 | |
| 44 | struct timerus *timer_base = (struct timerus *)NV_PA_TMRUS_BASE; |
| 45 | |
| 46 | /* counter runs at 1MHz */ |
| 47 | #define TIMER_CLK (1000000) |
| 48 | #define TIMER_LOAD_VAL 0xffffffff |
| 49 | |
| 50 | /* timer without interrupts */ |
| Tom Warren | 41b6838 | 2011-01-27 10:58:05 +0000 | [diff] [blame] | 51 | ulong get_timer(ulong base) |
| 52 | { |
| 53 | return get_timer_masked() - base; |
| 54 | } |
| 55 | |
| Tom Warren | 41b6838 | 2011-01-27 10:58:05 +0000 | [diff] [blame] | 56 | /* delay x useconds */ |
| 57 | void __udelay(unsigned long usec) |
| 58 | { |
| 59 | long tmo = usec * (TIMER_CLK / 1000) / 1000; |
| 60 | unsigned long now, last = readl(&timer_base->cntr_1us); |
| 61 | |
| 62 | while (tmo > 0) { |
| 63 | now = readl(&timer_base->cntr_1us); |
| 64 | if (last > now) /* count up timer overflow */ |
| 65 | tmo -= TIMER_LOAD_VAL - last + now; |
| 66 | else |
| 67 | tmo -= now - last; |
| 68 | last = now; |
| 69 | } |
| 70 | } |
| 71 | |
| Tom Warren | 41b6838 | 2011-01-27 10:58:05 +0000 | [diff] [blame] | 72 | ulong get_timer_masked(void) |
| 73 | { |
| 74 | ulong now; |
| 75 | |
| 76 | /* current tick value */ |
| 77 | now = readl(&timer_base->cntr_1us) / (TIMER_CLK / CONFIG_SYS_HZ); |
| 78 | |
| 79 | if (now >= gd->lastinc) /* normal mode (non roll) */ |
| 80 | /* move stamp forward with absolute diff ticks */ |
| 81 | gd->tbl += (now - gd->lastinc); |
| 82 | else /* we have rollover of incrementer */ |
| 83 | gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLK / CONFIG_SYS_HZ)) |
| 84 | - gd->lastinc) + now; |
| 85 | gd->lastinc = now; |
| 86 | return gd->tbl; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * This function is derived from PowerPC code (read timebase as long long). |
| 91 | * On ARM it just returns the timer value. |
| 92 | */ |
| 93 | unsigned long long get_ticks(void) |
| 94 | { |
| 95 | return get_timer(0); |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * This function is derived from PowerPC code (timebase clock frequency). |
| 100 | * On ARM it returns the number of timer ticks per second. |
| 101 | */ |
| 102 | ulong get_tbclk(void) |
| 103 | { |
| 104 | return CONFIG_SYS_HZ; |
| 105 | } |