This is commented out in the Makefile for more than 10 years. I assume it is proof that this tool is unused. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Pantelis Antoniou <panto@intracom.gr>master
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/*
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* (C) Copyright 2003 Intracom S.A. |
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* Pantelis Antoniou <panto@intracom.gr> |
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* |
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* This little program makes an exhaustive search for the |
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* correct terms of pdf, mfi, mfn, mfd, s, dbrmo, in PLPRCR. |
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* The goal is to produce a gclk2 from a xin input, while respecting |
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* all the restrictions on their combination. |
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* |
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* Generaly you select the first row of the produced table. |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#define DPREF_MIN 10000000 |
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#define DPREF_MAX 32000000 |
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#define DPGDCK_MAX 320000000 |
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#define DPGDCK_MIN 160000000 |
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#define S_MIN 0 |
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#define S_MAX 2 |
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#define MFI_MIN 5 |
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#define MFI_MAX 15 |
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#define MFN_MIN 0 |
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#define MFN_MAX 15 |
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#define MFD_MIN 0 |
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#define MFD_MAX 31 |
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#define MF_MIN 5 |
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#define MF_MAX 15 |
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#define PDF_MIN 0 |
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#define PDF_MAX 15 |
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#define GCLK2_MAX 150000000 |
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static int calculate (int xin, int target_clock, |
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int ppm, int pdf, int mfi, int mfn, int mfd, int s, |
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int *dprefp, int *dpgdckp, int *jdbckp, |
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int *gclk2p, int *dbrmop) |
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{ |
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unsigned int dpref, dpgdck, jdbck, gclk2, t1, t2, dbrmo; |
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/* valid MFI? */ |
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if (mfi < MFI_MIN) |
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return -1; |
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/* valid num, denum? */ |
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if (mfn > 0 && mfn >= mfd) |
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return -1; |
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dpref = xin / (pdf + 1); |
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/* valid dpef? */ |
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if (dpref < DPREF_MIN || dpref > DPREF_MAX) |
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return -1; |
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if (mfn == 0) { |
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dpgdck = (2 * mfi * xin) / (pdf + 1) ; |
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dbrmo = 0; |
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} else { |
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/* 5 <= mfi + (mfn / mfd + 1) <= 15 */ |
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t1 = mfd + 1; |
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t2 = mfi * t1 + mfn; |
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if ( MF_MIN * t1 > t2 || MF_MAX * t1 < t2) |
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return -1; |
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dpgdck = (unsigned int)(2 * (mfi * mfd + mfi + mfn) * |
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(unsigned int)xin) / |
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((mfd + 1) * (pdf + 1)); |
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dbrmo = 10 * mfn < (mfd + 1); |
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} |
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/* valid dpgclk? */ |
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if (dpgdck < DPGDCK_MIN || dpgdck > DPGDCK_MAX) |
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return -1; |
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jdbck = dpgdck >> s; |
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gclk2 = jdbck / 2; |
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/* valid gclk2 */ |
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if (gclk2 > GCLK2_MAX) |
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return -1; |
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t1 = abs(gclk2 - target_clock); |
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/* XXX max 1MHz dev. in clock */ |
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if (t1 > 1000000) |
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return -1; |
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/* dev within range (XXX gclk2 scaled to avoid overflow) */ |
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if (t1 * 1000 > (unsigned int)ppm * (gclk2 / 1000)) |
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return -1; |
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*dprefp = dpref; |
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*dpgdckp = dpgdck; |
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*jdbckp = jdbck; |
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*gclk2p = gclk2; |
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*dbrmop = dbrmo; |
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return gclk2; |
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} |
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int conf_clock(int xin, int target_clock, int ppm) |
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{ |
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int pdf, s, mfn, mfd, mfi; |
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int dpref, dpgdck, jdbck, gclk2, xout, dbrmo; |
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int found = 0; |
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/* integer multipliers */ |
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for (pdf = PDF_MIN; pdf <= PDF_MAX; pdf++) { |
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for (mfi = MFI_MIN; mfi <= MFI_MAX; mfi++) { |
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for (s = 0; s <= S_MAX; s++) { |
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xout = calculate(xin, target_clock, |
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ppm, pdf, mfi, 0, 0, s, |
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&dpref, &dpgdck, &jdbck, |
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&gclk2, &dbrmo); |
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if (xout < 0) |
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continue; |
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if (found == 0) { |
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printf("pdf mfi mfn mfd s dbrmo dpref dpgdck jdbck gclk2 exact?\n"); |
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printf("--- --- --- --- - ----- ----- ------ ----- ----- ------\n"); |
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} |
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printf("%3d %3d --- --- %1d %5d %9d %9d %9d %9d%s\n", |
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pdf, mfi, s, dbrmo, |
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dpref, dpgdck, jdbck, gclk2, |
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gclk2 == target_clock ? " YES" : ""); |
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found++; |
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} |
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} |
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} |
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/* fractional multipliers */ |
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for (pdf = PDF_MIN; pdf <= PDF_MAX; pdf++) { |
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for (mfi = MFI_MIN; mfi <= MFI_MAX; mfi++) { |
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for (mfn = 1; mfn <= MFN_MAX; mfn++) { |
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for (mfd = 1; mfd <= MFD_MAX; mfd++) { |
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for (s = 0; s <= S_MAX; s++) { |
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xout = calculate(xin, target_clock, |
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ppm, pdf, mfi, mfn, mfd, s, |
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&dpref, &dpgdck, &jdbck, |
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&gclk2, &dbrmo); |
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if (xout < 0) |
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continue; |
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if (found == 0) { |
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printf("pdf mfi mfn mfd s dbrmo dpref dpgdck jdbck gclk2 exact?\n"); |
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printf("--- --- --- --- - ----- ----- ------ ----- ----- ------\n"); |
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} |
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printf("%3d %3d %3d %3d %1d %5d %9d %9d %9d %9d%s\n", |
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pdf, mfi, mfn, mfd, s, |
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dbrmo, dpref, dpgdck, jdbck, gclk2, |
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gclk2 == target_clock ? " YES" : ""); |
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found++; |
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} |
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} |
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} |
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} |
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} |
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return found; |
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} |
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int main(int argc, char *argv[]) |
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{ |
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int xin, want_gclk2, found, ppm = 100; |
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if (argc < 3) { |
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fprintf(stderr, "usage: mpc86x_clk <xin> <want_gclk2> [ppm]\n"); |
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fprintf(stderr, " default ppm is 100\n"); |
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return 10; |
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} |
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xin = atoi(argv[1]); |
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want_gclk2 = atoi(argv[2]); |
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if (argc >= 4) |
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ppm = atoi(argv[3]); |
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found = conf_clock(xin, want_gclk2, ppm); |
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if (found <= 0) { |
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fprintf(stderr, "cannot produce gclk2 %d from xin %d\n", |
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want_gclk2, xin); |
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return EXIT_FAILURE; |
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} |
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return EXIT_SUCCESS; |
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} |
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