| /* |
| * (C) Copyright 2007 |
| * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com> |
| * |
| * (C) Copyright 2007 |
| * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> |
| * |
| * (C) Copyright 2003 |
| * Wolfgang Denk, DENX Software Engineering, wd@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/processor.h> |
| #include <asm/io.h> |
| |
| #define TMU_MAX_COUNTER (~0UL) |
| |
| static void tmu_timer_start(unsigned int timer) |
| { |
| if (timer > 2) |
| return; |
| |
| outb(inb(TSTR) | (1 << timer), TSTR); |
| } |
| |
| static void tmu_timer_stop(unsigned int timer) |
| { |
| u8 val = inb(TSTR); |
| |
| if (timer > 2) |
| return; |
| outb(val & ~(1 << timer), TSTR); |
| } |
| |
| int timer_init(void) |
| { |
| /* Divide clock by 4 */ |
| outw(0, TCR0); |
| |
| tmu_timer_stop(0); |
| tmu_timer_start(0); |
| return 0; |
| } |
| |
| /* |
| In theory we should return a true 64bit value (ie something that doesn't |
| overflow). However, we don't. Therefore if TMU runs at fastest rate of |
| 6.75 MHz this value will wrap after u-boot has been running for approx |
| 10 minutes. |
| */ |
| unsigned long long get_ticks(void) |
| { |
| return (0 - inl(TCNT0)); |
| } |
| |
| unsigned long get_timer(unsigned long base) |
| { |
| return ((0 - inl(TCNT0)) - base); |
| } |
| |
| void set_timer(unsigned long t) |
| { |
| outl(0 - t, TCNT0); |
| } |
| |
| void reset_timer(void) |
| { |
| tmu_timer_stop(0); |
| set_timer(0); |
| tmu_timer_start(0); |
| } |
| |
| void udelay(unsigned long usec) |
| { |
| unsigned int start = get_timer(0); |
| unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000)); |
| |
| while (get_timer(0) < end) |
| continue; |
| } |
| |
| unsigned long get_tbclk(void) |
| { |
| return CFG_HZ; |
| } |