1 /* 2 * (C) Copyright 2002 3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 4 * Marius Groeger <mgroeger@sysgo.de> 5 * 6 * (C) Copyright 2002 7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8 * Alex Zuepke <azu@sysgo.de> 9 * 10 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 #include <common.h> 30 #include <SA-1100.h> 31 32 int timer_init (void) 33 { 34 return 0; 35 } 36 37 void reset_timer (void) 38 { 39 reset_timer_masked (); 40 } 41 42 ulong get_timer (ulong base) 43 { 44 return get_timer_masked (); 45 } 46 47 void __udelay (unsigned long usec) 48 { 49 udelay_masked (usec); 50 } 51 52 53 void reset_timer_masked (void) 54 { 55 OSCR = 0; 56 } 57 58 ulong get_timer_masked (void) 59 { 60 return OSCR; 61 } 62 63 void udelay_masked (unsigned long usec) 64 { 65 ulong tmo; 66 ulong endtime; 67 signed long diff; 68 69 if (usec >= 1000) { 70 tmo = usec / 1000; 71 tmo *= CONFIG_SYS_HZ; 72 tmo /= 1000; 73 } else { 74 tmo = usec * CONFIG_SYS_HZ; 75 tmo /= (1000*1000); 76 } 77 78 endtime = get_timer_masked () + tmo; 79 80 do { 81 ulong now = get_timer_masked (); 82 diff = endtime - now; 83 } while (diff >= 0); 84 } 85 86 /* 87 * This function is derived from PowerPC code (read timebase as long long). 88 * On ARM it just returns the timer value. 89 */ 90 unsigned long long get_ticks(void) 91 { 92 return get_timer(0); 93 } 94 95 /* 96 * This function is derived from PowerPC code (timebase clock frequency). 97 * On ARM it returns the number of timer ticks per second. 98 */ 99 ulong get_tbclk (void) 100 { 101 ulong tbclk; 102 103 tbclk = CONFIG_SYS_HZ; 104 return tbclk; 105 } 106