3 * Texas Instruments <www.ti.com>
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
13 * (C) Copyright 2002-2004
14 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
17 * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
19 * See file CREDITS for list of people who contributed to this
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License as
24 * published by the Free Software Foundation; either version 2 of
25 * the License, or (at your option) any later version.
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
41 #define TIMER_LOAD_VAL 0xffffffff
42 extern void reset_cpu(ulong addr
);
44 #ifdef CONFIG_INTEGRATOR
45 /* Timer functionality supplied by Integrator board (AP or CP) */
48 static ulong timestamp
;
51 /* nothing really to do with interrupts, just starts up a counter. */
52 int interrupt_init (void)
54 /* init the timestamp and lastdec value */
61 * timer without interrupts
64 void reset_timer (void)
66 reset_timer_masked ();
69 ulong
get_timer (ulong base
)
71 return get_timer_masked () - base
;
74 void set_timer (ulong t
)
79 /* delay x useconds AND perserve advance timstamp value */
80 void udelay(unsigned long usec
)
85 void reset_timer_masked (void)
88 lastdec
= READ_TIMER
; /* capure current decrementer value time */
89 timestamp
= 0; /* start "advancing" time stamp from 0 */
92 ulong
get_timer_raw (void)
94 ulong now
= READ_TIMER
; /* current tick value */
96 if (lastdec
>= now
) { /* normal mode (non roll) */
98 timestamp
+= lastdec
- now
; /* move stamp fordward with absoulte diff ticks */
99 } else { /* we have overflow of the count down timer */
100 /* nts = ts + ld + (TLV - now)
101 * ts=old stamp, ld=time that passed before passing through -1
102 * (TLV-now) amount of time after passing though -1
103 * nts = new "advancing time stamp"...it could also roll and cause problems.
105 timestamp
+= lastdec
+ TIMER_LOAD_VAL
- now
;
112 ulong
get_timer_masked (void)
114 return get_timer_raw() / TIMER_LOAD_VAL
;
117 /* waits specified delay value and resets timestamp */
118 void udelay_masked (unsigned long usec
)
122 if(usec
>= 1000){ /* if "big" number, spread normalization to seconds */
123 tmo
= usec
/ 1000; /* start to normalize for usec to ticks per sec */
124 tmo
*= CFG_HZ_CLOCK
; /* find number of "ticks" to wait to achieve target */
125 tmo
/= 1000; /* finish normalize. */
126 }else{ /* else small number, don't kill it prior to HZ multiply */
127 tmo
= usec
* CFG_HZ_CLOCK
;
131 reset_timer_masked (); /* set "advancing" timestamp to 0, set lastdec vaule */
133 while (get_timer_raw () < tmo
) /* wait for time stamp to overtake tick number.*/
138 * This function is derived from PowerPC code (read timebase as long long).
139 * On ARM it just returns the timer value.
141 unsigned long long get_ticks(void)
147 * This function is derived from PowerPC code (timebase clock frequency).
148 * On ARM it returns the number of timer ticks per second.
150 ulong
get_tbclk (void)
158 #endif /* CONFIG_INTEGRATOR */