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_timer_masked(); 47 48 return (0); 49 } 50 51 /* 52 * timer without interrupts 53 */ 54 55 void reset_timer (void) 56 { 57 reset_timer_masked (); 58 } 59 60 ulong get_timer (ulong base) 61 { 62 return get_timer_masked() - base; 63 } 64 65 void set_timer (ulong t) 66 { 67 /* nop */ 68 } 69 70 void reset_timer_masked (void) 71 { 72 TCTL1 &= ~TCTL_TEN; 73 TCTL1 |= TCTL_TEN; /* Enable timer */ 74 } 75 76 ulong get_timer_masked (void) 77 { 78 return TCN1; 79 } 80 81 void udelay_masked (unsigned long usec) 82 { 83 ulong endtime = get_timer_masked() + usec; 84 signed long diff; 85 86 do { 87 ulong now = get_timer_masked (); 88 diff = endtime - now; 89 } while (diff >= 0); 90 } 91 92 void __udelay (unsigned long usec) 93 { 94 udelay_masked(usec); 95 } 96 97 /* 98 * This function is derived from PowerPC code (read timebase as long long). 99 * On ARM it just returns the timer value. 100 */ 101 unsigned long long get_ticks(void) 102 { 103 return get_timer(0); 104 } 105 106 /* 107 * This function is derived from PowerPC code (timebase clock frequency). 108 * On ARM it returns the number of timer ticks per second. 109 */ 110 ulong get_tbclk (void) 111 { 112 ulong tbclk; 113 114 tbclk = CONFIG_SYS_HZ; 115 116 return tbclk; 117 } 118 119 /* 120 * Reset the cpu by setting up the watchdog timer and let him time out 121 */ 122 void reset_cpu (ulong ignored) 123 { 124 /* Disable watchdog and set Time-Out field to 0 */ 125 WCR = 0x00000000; 126 127 /* Write Service Sequence */ 128 WSR = 0x00005555; 129 WSR = 0x0000AAAA; 130 131 /* Enable watchdog */ 132 WCR = 0x00000001; 133 134 while (1); 135 /*NOTREACHED*/ 136 } 137 138 #endif /* defined (CONFIG_IMX) */ 139