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 ulong get_timer (ulong base) 38 { 39 return get_timer_masked (); 40 } 41 42 void __udelay (unsigned long usec) 43 { 44 udelay_masked (usec); 45 } 46 47 48 void reset_timer_masked (void) 49 { 50 OSCR = 0; 51 } 52 53 ulong get_timer_masked (void) 54 { 55 return OSCR; 56 } 57 58 void udelay_masked (unsigned long usec) 59 { 60 ulong tmo; 61 ulong endtime; 62 signed long diff; 63 64 if (usec >= 1000) { 65 tmo = usec / 1000; 66 tmo *= CONFIG_SYS_HZ; 67 tmo /= 1000; 68 } else { 69 tmo = usec * CONFIG_SYS_HZ; 70 tmo /= (1000*1000); 71 } 72 73 endtime = get_timer_masked () + tmo; 74 75 do { 76 ulong now = get_timer_masked (); 77 diff = endtime - now; 78 } while (diff >= 0); 79 } 80 81 /* 82 * This function is derived from PowerPC code (read timebase as long long). 83 * On ARM it just returns the timer value. 84 */ 85 unsigned long long get_ticks(void) 86 { 87 return get_timer(0); 88 } 89 90 /* 91 * This function is derived from PowerPC code (timebase clock frequency). 92 * On ARM it returns the number of timer ticks per second. 93 */ 94 ulong get_tbclk (void) 95 { 96 ulong tbclk; 97 98 tbclk = CONFIG_SYS_HZ; 99 return tbclk; 100 } 101