1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/*
* include/asm-v850/v850e_timer_d.c -- `Timer D' component often used
* with V850E CPUs
*
* Copyright (C) 2001,02,03 NEC Electronics Corporation
* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <linux/kernel.h>
#include <asm/v850e_utils.h>
#include <asm/v850e_timer_d.h>
/* Start interval timer TIMER (0-3). The timer will issue the
corresponding INTCMD interrupt RATE times per second.
This function does not enable the interrupt. */
void v850e_timer_d_configure (unsigned timer, unsigned rate)
{
unsigned divlog2, count;
/* Calculate params for timer. */
if (! calc_counter_params (
V850E_TIMER_D_BASE_FREQ, rate,
V850E_TIMER_D_TMCD_CS_MIN, V850E_TIMER_D_TMCD_CS_MAX, 16,
&divlog2, &count))
printk (KERN_WARNING
"Cannot find interval timer %d setting suitable"
" for rate of %dHz.\n"
"Using rate of %dHz instead.\n",
timer, rate,
(V850E_TIMER_D_BASE_FREQ >> divlog2) >> 16);
/* Do the actual hardware timer initialization: */
/* Enable timer. */
V850E_TIMER_D_TMCD(timer) = V850E_TIMER_D_TMCD_CAE;
/* Set clock divider. */
V850E_TIMER_D_TMCD(timer)
= V850E_TIMER_D_TMCD_CAE
| V850E_TIMER_D_TMCD_CS(divlog2);
/* Set timer compare register. */
V850E_TIMER_D_CMD(timer) = count;
/* Start counting. */
V850E_TIMER_D_TMCD(timer)
= V850E_TIMER_D_TMCD_CAE
| V850E_TIMER_D_TMCD_CS(divlog2)
| V850E_TIMER_D_TMCD_CE;
}
|
