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, <garyj@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,
33 #if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB)
35 #if defined(CONFIG_S3C2400)
37 #elif defined(CONFIG_S3C2410)
41 int timer_load_val = 0;
43 /* macro to read the 16 bit timer */
44 static inline ulong READ_TIMER(void)
46 S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS();
48 return (timers->TCNTO4 & 0xffff);
51 static ulong timestamp;
56 S3C24X0_TIMERS * const timers = S3C24X0_GetBase_TIMERS();
58 /* use PWM Timer 4 because it has no output */
59 /* prescaler for Timer 4 is 16 */
60 timers->TCFG0 = 0x0f00;
61 if (timer_load_val == 0)
64 * for 10 ms clock period @ PCLK with 4 bit divider = 1/2
65 * (default) and prescaler = 16. Should be 10390
66 * @33.25MHz and 15625 @ 50 MHz
68 timer_load_val = get_PCLK()/(2 * 16 * 100);
70 /* load value for 10 ms timeout */
71 lastdec = timers->TCNTB4 = timer_load_val;
72 /* auto load, manual update of Timer 4 */
73 timers->TCON = (timers->TCON & ~0x0700000) | 0x600000;
74 /* auto load, start Timer 4 */
75 timers->TCON = (timers->TCON & ~0x0700000) | 0x500000;
82 * timer without interrupts
85 void reset_timer (void)
87 reset_timer_masked ();
90 ulong get_timer (ulong base)
92 return get_timer_masked () - base;
95 void set_timer (ulong t)
100 void udelay (unsigned long usec)
103 ulong start = get_timer(0);
106 tmo *= (timer_load_val * 100);
109 while ((ulong)(get_timer_masked () - start) < tmo)
113 void reset_timer_masked (void)
116 lastdec = READ_TIMER();
120 ulong get_timer_masked (void)
122 ulong now = READ_TIMER();
124 if (lastdec >= now) {
126 timestamp += lastdec - now;
128 /* we have an overflow ... */
129 timestamp += lastdec + timer_load_val - now;
136 void udelay_masked (unsigned long usec)
144 tmo *= (timer_load_val * 100);
147 tmo = usec * (timer_load_val * 100);
151 endtime = get_timer_masked () + tmo;
154 ulong now = get_timer_masked ();
155 diff = endtime - now;
160 * This function is derived from PowerPC code (read timebase as long long).
161 * On ARM it just returns the timer value.
163 unsigned long long get_ticks(void)
169 * This function is derived from PowerPC code (timebase clock frequency).
170 * On ARM it returns the number of timer ticks per second.
172 ulong get_tbclk (void)
176 #if defined(CONFIG_SMDK2400) || defined(CONFIG_TRAB)
177 tbclk = timer_load_val * 100;
178 #elif defined(CONFIG_SBC2410X) || \
179 defined(CONFIG_SMDK2410) || \
180 defined(CONFIG_VCMA9)
181 tbclk = CONFIG_SYS_HZ;
183 # error "tbclk not configured"
190 * reset the cpu by setting up the watchdog timer and let him time out
192 void reset_cpu (ulong ignored)
194 volatile S3C24X0_WATCHDOG * watchdog;
197 extern void disable_vfd (void);
202 watchdog = S3C24X0_GetBase_WATCHDOG();
204 /* Disable watchdog */
205 watchdog->WTCON = 0x0000;
207 /* Initialize watchdog timer count register */
208 watchdog->WTCNT = 0x0001;
210 /* Enable watchdog timer; assert reset at timer timeout */
211 watchdog->WTCON = 0x0021;
213 while(1); /* loop forever and wait for reset to happen */
218 #endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */