124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* $NetBSD: clockgen.c,v 1.1 1999/03/25 04:05:37 explorer Exp $ */
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/*-
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* Copyright (c) 1997-1999 LAN Media Corporation (LMC)
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* All rights reserved. www.lanmedia.com
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*
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* This code is written by Michael Graff <graff@vix.com> for LMC.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* 3. All marketing or advertising materials mentioning features or
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* use of this software must display the following acknowledgement:
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* This product includes software developed by LAN Media Corporation
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* and its contributors.
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* 4. Neither the name of LAN Media Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY LAN MEDIA CORPORATION AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <dev/pci/if_lmc_types.h>
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#include <dev/pci/if_lmcioctl.h>
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#include "extern.h"
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#define T1_FREF 20000000
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#define T1_FMIN 30000000
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#define T1_FMAX 330000000
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void
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lmc_av9110_freq(u_int32_t target, lmc_av9110_t *av)
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{
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unsigned int n, m, v, x, r;
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unsigned long f;
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unsigned long iFvco;
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av->n = 0;
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av->m = 0;
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av->v = 0;
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av->x = 0;
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av->r = 0;
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av->f = 0;
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av->exact = 0;
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target *= 16;
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for (n = 3 ; n <= 127 ; n++)
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for (m = 3 ; m <= 127 ; m++)
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for (v = 1 ; v <= 8 ; v *= 8)
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for (x = 1 ; x <= 8 ; x <<= 1)
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for (r = 1 ; r <= 8 ; r <<= 1) {
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iFvco = (T1_FREF / m) * n * v;
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if (iFvco < T1_FMIN || iFvco > T1_FMAX)
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continue;
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f = iFvco / (x * r);
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if (f >= target)
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if ((av->f == 0) || (f - target < av->f - target)) {
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av->n = n;
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av->m = m;
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if (v == 1)
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av->v = 0;
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else
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av->v = 1;
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if (x == 1)
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av->x = 0;
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else if (x == 2)
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av->x = 1;
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else if (x == 4)
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av->x = 2;
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else if (x == 8)
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av->x = 3;
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if (r == 1)
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av->r = 0;
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else if (r == 2)
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av->r = 1;
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else if (r == 4)
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av->r = 2;
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else if (r == 8)
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av->r = 3;
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av->f = f;
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if (f == target) {
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av->exact = 1;
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av->f /= 16;
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return;
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}
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}
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}
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av->f /= 16;
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}
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