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/* $OpenBSD: clockgen.c,v 1.3 2004/08/08 19:04:25 deraadt Exp $ */
/* $Id: clockgen.c,v 1.3 2004/08/08 19:04:25 deraadt Exp $ */
/*-
* Copyright (c) 1997-1999 LAN Media Corporation (LMC)
* All rights reserved. www.lanmedia.com
*
* This code is written by Michael Graff (explorer@vix.com) for LMC.
* The code is derived from permitted modifications to software created
* by Matt Thomas (matt@3am-software.com).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All marketing or advertising materials mentioning features or use of this
* software must display the following acknowledgement:
* This product includes software developed by LAN Media Corporation
* and its contributors.
* 4. Neither the name of LAN Media Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY LAN MEDIA CORPORATION AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE CORPORATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
typedef struct lmc___ctl lmc_ctl_t;
#include <dev/pci/if_lmcioctl.h>
#define T1_FREF 20000000
#define T1_FMIN 30000000
#define T1_FMAX 330000000
void
lmc_av9110_freq(u_int32_t target, lmc_av9110_t *av)
{
unsigned int n, m, v, x, r;
unsigned long f;
unsigned long iFvco;
av->n = 0;
av->m = 0;
av->v = 0;
av->x = 0;
av->r = 0;
av->f = 0;
av->exact = 0;
target *= 16;
for (n = 3 ; n <= 127 ; n++)
for (m = 3 ; m <= 127 ; m++)
for (v = 1 ; v <= 8 ; v *= 8)
for (x = 1 ; x <= 8 ; x <<= 1)
for (r = 1 ; r <= 8 ; r <<= 1) {
iFvco = (T1_FREF / m) * n * v;
if (iFvco < T1_FMIN || iFvco > T1_FMAX)
continue;
f = iFvco / (x * r);
if (f >= target)
if ((av->f == 0) || (f - target < av->f - target)) {
av->n = n;
av->m = m;
if (v == 1)
av->v = 0;
else
av->v = 1;
if (x == 1)
av->x = 0;
else if (x == 2)
av->x = 1;
else if (x == 4)
av->x = 2;
else if (x == 8)
av->x = 3;
if (r == 1)
av->r = 0;
else if (r == 2)
av->r = 1;
else if (r == 4)
av->r = 2;
else if (r == 8)
av->r = 3;
av->f = f;
if (f == target) {
av->exact = 1;
av->f /= 16;
return;
}
}
}
av->f /= 16;
}
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