3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
11 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
13 * See file CREDITS for list of people who contributed to this
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.
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.
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,
36 static ulong timer_load_val = 0;
38 /* macro to read the 16 bit timer */
39 static inline ulong READ_TIMER(void)
41 lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR;
42 lh7a40x_timer_t* timer = &timers->timer1;
44 return (timer->value & 0x0000ffff);
47 static ulong timestamp;
50 int interrupt_init (void)
52 lh7a40x_timers_t* timers = LH7A40X_TIMERS_PTR;
53 lh7a40x_timer_t* timer = &timers->timer1;
55 /* a periodic timer using the 508kHz source */
56 timer->control = (TIMER_PER | TIMER_CLK508K);
58 if (timer_load_val == 0) {
60 * 10ms period with 508.469kHz clock = 5084
62 timer_load_val = CONFIG_SYS_HZ/100;
65 /* load value for 10 ms timeout */
66 lastdec = timer->load = timer_load_val;
68 /* auto load, start timer */
69 timer->control = timer->control | TIMER_EN;
76 * timer without interrupts
79 void reset_timer (void)
81 reset_timer_masked ();
84 ulong get_timer (ulong base)
86 return (get_timer_masked() - base);
89 void set_timer (ulong t)
94 void udelay (unsigned long usec)
101 tmo *= CONFIG_SYS_HZ;
106 tmo = usec * CONFIG_SYS_HZ;
113 /* check for rollover during this delay */
115 if ((tmp + tmo) < tmp )
116 reset_timer_masked(); /* timer would roll over */
120 while (get_timer_masked () < tmo);
123 void reset_timer_masked (void)
126 lastdec = READ_TIMER();
130 ulong get_timer_masked (void)
132 ulong now = READ_TIMER();
134 if (lastdec >= now) {
136 timestamp += (lastdec - now);
138 /* we have an overflow ... */
139 timestamp += ((lastdec + timer_load_val) - now);
146 void udelay_masked (unsigned long usec)
155 tmo *= CONFIG_SYS_HZ;
159 tmo = usec * CONFIG_SYS_HZ;
166 endtime = get_timer_masked () + tmo;
169 ulong now = get_timer_masked ();
170 diff = endtime - now;
175 * This function is derived from PowerPC code (read timebase as long long).
176 * On ARM it just returns the timer value.
178 unsigned long long get_ticks(void)
184 * This function is derived from PowerPC code (timebase clock frequency).
185 * On ARM it returns the number of timer ticks per second.
187 ulong get_tbclk (void)
191 tbclk = timer_load_val * 100;