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 * (C) Copyright 2002 11 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> 12 * 13 * See file CREDITS for list of people who contributed to this 14 * project. 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License as 18 * published by the Free Software Foundation; either version 2 of 19 * the License, or (at your option) any later version. 20 * 21 * This program is distributed in the hope that it will be useful, 22 * but WITHOUT ANY WARRANTY; without even the implied warranty of 23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24 * GNU General Public License for more details. 25 * 26 * You should have received a copy of the GNU General Public License 27 * along with this program; if not, write to the Free Software 28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 29 * MA 02111-1307 USA 30 */ 31 32 #include <common.h> 33 #if defined (CONFIG_IMX) 34 35 #include <asm/arch/imx-regs.h> 36 37 int timer_init (void) 38 { 39 int i; 40 /* setup GP Timer 1 */ 41 TCTL1 = TCTL_SWR; 42 for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */ 43 TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */ 44 TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */ 45 46 /* Reset the timer */ 47 TCTL1 &= ~TCTL_TEN; 48 TCTL1 |= TCTL_TEN; /* Enable timer */ 49 50 return (0); 51 } 52 53 /* 54 * timer without interrupts 55 */ 56 ulong get_timer (ulong base) 57 { 58 return get_timer_masked() - base; 59 } 60 61 ulong get_timer_masked (void) 62 { 63 return TCN1; 64 } 65 66 void udelay_masked (unsigned long usec) 67 { 68 ulong endtime = get_timer_masked() + usec; 69 signed long diff; 70 71 do { 72 ulong now = get_timer_masked (); 73 diff = endtime - now; 74 } while (diff >= 0); 75 } 76 77 void __udelay (unsigned long usec) 78 { 79 udelay_masked(usec); 80 } 81 82 /* 83 * This function is derived from PowerPC code (read timebase as long long). 84 * On ARM it just returns the timer value. 85 */ 86 unsigned long long get_ticks(void) 87 { 88 return get_timer(0); 89 } 90 91 /* 92 * This function is derived from PowerPC code (timebase clock frequency). 93 * On ARM it returns the number of timer ticks per second. 94 */ 95 ulong get_tbclk (void) 96 { 97 ulong tbclk; 98 99 tbclk = CONFIG_SYS_HZ; 100 101 return tbclk; 102 } 103 104 /* 105 * Reset the cpu by setting up the watchdog timer and let him time out 106 */ 107 void reset_cpu (ulong ignored) 108 { 109 /* Disable watchdog and set Time-Out field to 0 */ 110 WCR = 0x00000000; 111 112 /* Write Service Sequence */ 113 WSR = 0x00005555; 114 WSR = 0x0000AAAA; 115 116 /* Enable watchdog */ 117 WCR = 0x00000001; 118 119 while (1); 120 /*NOTREACHED*/ 121 } 122 123 #endif /* defined (CONFIG_IMX) */ 124