1 /* 2 * (C) Copyright 2007 Michal Simek 3 * 4 * Michal SIMEK <monstr@monstr.eu> 5 * 6 * See file CREDITS for list of people who contributed to this 7 * project. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of 12 * the License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 22 * MA 02111-1307 USA 23 */ 24 25 #include <common.h> 26 #include <asm/microblaze_timer.h> 27 #include <asm/microblaze_intc.h> 28 29 volatile int timestamp = 0; 30 31 #ifdef CONFIG_SYS_TIMER_0 32 ulong get_timer (ulong base) 33 { 34 return (timestamp - base); 35 } 36 #else 37 ulong get_timer (ulong base) 38 { 39 return (timestamp++ - base); 40 } 41 #endif 42 43 #ifdef CONFIG_SYS_TIMER_0 44 void __udelay(unsigned long usec) 45 { 46 int i; 47 48 i = get_timer(0); 49 while ((get_timer(0) - i) < (usec / 1000)) 50 ; 51 } 52 #else 53 void __udelay(unsigned long usec) 54 { 55 unsigned int i; 56 57 for (i = 0; i < (usec * CONFIG_XILINX_CLOCK_FREQ / 10000000); i++) 58 ; 59 } 60 #endif 61 62 #ifdef CONFIG_SYS_TIMER_0 63 microblaze_timer_t *tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR); 64 65 void timer_isr (void *arg) 66 { 67 timestamp++; 68 tmr->control = tmr->control | TIMER_INTERRUPT; 69 } 70 71 int timer_init (void) 72 { 73 tmr->loadreg = CONFIG_SYS_TIMER_0_PRELOAD; 74 tmr->control = TIMER_INTERRUPT | TIMER_RESET; 75 tmr->control = 76 TIMER_ENABLE | TIMER_ENABLE_INTR | TIMER_RELOAD | TIMER_DOWN_COUNT; 77 timestamp = 0; 78 install_interrupt_handler (CONFIG_SYS_TIMER_0_IRQ, timer_isr, (void *)tmr); 79 return 0; 80 } 81 #endif 82 83 /* 84 * This function is derived from PowerPC code (read timebase as long long). 85 * On Microblaze it just returns the timer value. 86 */ 87 unsigned long long get_ticks(void) 88 { 89 return get_timer(0); 90 } 91 92 /* 93 * This function is derived from PowerPC code (timebase clock frequency). 94 * On Microblaze it returns the number of timer ticks per second. 95 */ 96 ulong get_tbclk(void) 97 { 98 return CONFIG_SYS_HZ; 99 } 100