]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib_m68k/time.c
2 * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/mcftimer.h>
31 #include <asm/m5272.h>
32 #include <asm/immap_5272.h>
36 #include <asm/m5282.h>
40 static ulong timestamp
;
42 static unsigned short lastinc
;
46 #if defined(CONFIG_M5272)
48 * We use timer 3 which is running with a period of 1 us
50 void udelay(unsigned long usec
)
52 volatile timer_t
*timerp
= (timer_t
*) (CFG_MBAR
+ MCFTIMER_BASE3
);
62 /* Set up TIMER 3 as timebase clock */
63 timerp
->timer_tmr
= MCFTIMER_TMR_DISABLE
;
64 timerp
->timer_tcn
= 0;
65 /* set period to 1 us */
66 timerp
->timer_tmr
= (((CFG_CLK
/ 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1
|
67 MCFTIMER_TMR_FREERUN
| MCFTIMER_TMR_ENABLE
;
69 start
= now
= timerp
->timer_tcn
;
70 while (now
< start
+ tmp
)
71 now
= timerp
->timer_tcn
;
75 void mcf_timer_interrupt (void * not_used
){
76 volatile timer_t
*timerp
= (timer_t
*) (CFG_MBAR
+ MCFTIMER_BASE4
);
77 volatile intctrl_t
*intp
= (intctrl_t
*) (CFG_MBAR
+ MCFSIM_ICR1
);
79 /* check for timer 4 interrupts */
80 if ((intp
->int_isr
& 0x01000000) != 0) {
85 timerp
->timer_ter
= MCFTIMER_TER_CAP
| MCFTIMER_TER_REF
;
89 void timer_init (void) {
90 volatile timer_t
*timerp
= (timer_t
*) (CFG_MBAR
+ MCFTIMER_BASE4
);
91 volatile intctrl_t
*intp
= (intctrl_t
*) (CFG_MBAR
+ MCFSIM_ICR1
);
95 /* Set up TIMER 4 as clock */
96 timerp
->timer_tmr
= MCFTIMER_TMR_DISABLE
;
98 /* initialize and enable timer 4 interrupt */
99 irq_install_handler (72, mcf_timer_interrupt
, 0);
100 intp
->int_icr1
|= 0x0000000d;
102 timerp
->timer_tcn
= 0;
103 timerp
->timer_trr
= 1000; /* Interrupt every ms */
104 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
105 timerp
->timer_tmr
= (((CFG_CLK
/ 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1
|
106 MCFTIMER_TMR_RESTART
| MCFTIMER_TMR_ENORI
| MCFTIMER_TMR_ENABLE
;
109 void reset_timer (void)
114 ulong
get_timer (ulong base
)
116 return (timestamp
- base
);
119 void set_timer (ulong t
)
125 #if defined(CONFIG_M5282)
127 void udelay(unsigned long usec
)
131 void timer_init (void)
133 volatile unsigned short *timerp
;
135 timerp
= (volatile unsigned short *) (CFG_MBAR
+ MCFTIMER_BASE4
);
138 /* Set up TIMER 4 as poll clock */
139 timerp
[MCFTIMER_PCSR
] = MCFTIMER_PCSR_OVW
;
140 timerp
[MCFTIMER_PMR
] = lastinc
= 0;
141 timerp
[MCFTIMER_PCSR
] =
142 (5 << 8) | MCFTIMER_PCSR_EN
| MCFTIMER_PCSR_OVW
;
145 void set_timer (ulong t
)
147 volatile unsigned short *timerp
;
149 timerp
= (volatile unsigned short *) (CFG_MBAR
+ MCFTIMER_BASE4
);
151 timerp
[MCFTIMER_PMR
] = lastinc
= 0;
154 ulong
get_timer (ulong base
)
156 unsigned short now
, diff
;
157 volatile unsigned short *timerp
;
159 timerp
= (volatile unsigned short *) (CFG_MBAR
+ MCFTIMER_BASE4
);
160 now
= timerp
[MCFTIMER_PCNTR
];
161 diff
= -(now
- lastinc
);
165 return timestamp
- base
;
168 void wait_ticks (unsigned long ticks
)
171 while (get_timer (0) < ticks
);