3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/processor.h>
27 #define TMU_MAX_COUNTER (~0UL)
29 static void tmu_timer_start (unsigned int timer)
34 *((volatile unsigned char *) TSTR0) |= (1 << timer);
39 /* Divide clock by 4 */
40 *(volatile u16 *)TCR0 = 0;
47 In theory we should return a true 64bit value (ie something that doesn't
48 overflow). However, we don't. Therefore if TMU runs at fastest rate of
49 6.75 MHz this value will wrap after u-boot has been running for approx
52 unsigned long long get_ticks (void)
54 return (0 - *((volatile unsigned int *) TCNT0));
57 unsigned long get_timer (unsigned long base)
60 *((volatile unsigned int *)TCNT0) ;
62 return ((int)n - base ) < 0 ? ( TMU_MAX_COUNTER - ( base -n )):(n - base );
65 void set_timer (unsigned long t)
67 *((volatile unsigned int *) TCNT0) = (0 - t);
70 void reset_timer (void)
75 void udelay (unsigned long usec)
77 unsigned int start = get_timer (0);
80 end = ((usec/100000) * CFG_HZ) / 10;
82 end = ((usec/100) * CFG_HZ) / 10000;
84 end = (usec * CFG_HZ) / 1000000;
86 while (get_timer (0) < end)
90 unsigned long get_tbclk (void)