2 * (C) Copyright 2007 Michal Simek
4 * Michal SIMEK <monstr@monstr.eu>
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 #include <asm/microblaze_timer.h>
27 #include <asm/microblaze_intc.h>
29 volatile int timestamp = 0;
30 microblaze_timer_t *tmr;
32 ulong get_timer (ulong base)
35 return timestamp - base;
36 return timestamp++ - base;
39 void __udelay(unsigned long usec)
45 while ((get_timer(0) - i) < (usec / 1000))
48 for (i = 0; i < (usec * XILINX_CLOCK_FREQ / 10000000); i++)
53 static void timer_isr(void *arg)
56 tmr->control = tmr->control | TIMER_INTERRUPT;
65 #if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
66 preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ;
67 irq = CONFIG_SYS_TIMER_0_IRQ;
68 tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR);
71 if (tmr && preload && irq >= 0) {
72 tmr->loadreg = preload;
73 tmr->control = TIMER_INTERRUPT | TIMER_RESET;
74 tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
75 TIMER_RELOAD | TIMER_DOWN_COUNT;
77 ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
82 /* No problem if timer is not found/initialized */
87 * This function is derived from PowerPC code (read timebase as long long).
88 * On Microblaze it just returns the timer value.
90 unsigned long long get_ticks(void)
96 * This function is derived from PowerPC code (timebase clock frequency).
97 * On Microblaze it returns the number of timer ticks per second.
101 return CONFIG_SYS_HZ;