upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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202 lines
6.4 KiB
202 lines
6.4 KiB
/*
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* Program for finding M & N values for DPLLs
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* To be run on Host PC
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*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Aneesh V <aneesh@ti.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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typedef unsigned int u32;
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#define MAX_N 127
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/*
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* get_m_n_optimized() - Finds optimal DPLL multiplier(M) and divider(N)
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* values based on the reference frequency, required output frequency,
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* maximum tolerance for output frequency etc.
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*
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* target_freq_khz - output frequency required in KHz
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* ref_freq_khz - reference(input) frequency in KHz
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* m - pointer to computed M value
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* n - pointer to computed N value
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* tolerance_khz - tolerance for the output frequency. When the algorithm
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* succeeds in finding vialble M and N values the corresponding output
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* frequency will be in the range:
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* [target_freq_khz - tolerance_khz, target_freq_khz]
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*
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* Formula:
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* Fdpll = (2 * M * Fref) / (N + 1)
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*
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* Considerations for lock-time:
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* - Smaller the N, better lock-time, especially lock-time will be
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* - For acceptable lock-times:
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* Fref / (M + 1) >= 1 MHz
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*
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* Considerations for power:
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* - The difference in power for different N values giving the same
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* output is negligible. So, we optimize for lock-time
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*
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* Hard-constraints:
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* - N can not be greater than 127(7 bit field for representing N)
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*
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* Usage:
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* $ gcc clocks_get_m_n.c
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* $ ./a.out
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*/
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int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 *M, u32 *N)
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{
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u32 freq = target_freq_khz;
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u32 m_optimal, n_optimal, freq_optimal = 0, freq_old;
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u32 m, n;
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n = 1;
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while (1) {
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m = target_freq_khz / ref_freq_khz / 2 * n;
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freq_old = 0;
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while (1) {
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freq = ref_freq_khz * 2 * m / n;
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if (freq > target_freq_khz) {
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freq = freq_old;
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m--;
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break;
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}
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m++;
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freq_old = freq;
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}
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if (freq > freq_optimal) {
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freq_optimal = freq;
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m_optimal = m;
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n_optimal = n;
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}
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n++;
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if ((freq_optimal == target_freq_khz) ||
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((ref_freq_khz / n) < 1000)) {
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break;
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}
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}
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n--;
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*M = m_optimal;
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*N = n_optimal - 1;
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printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz,
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m_optimal, n_optimal - 1, target_freq_khz, freq_optimal);
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return 0;
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}
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void main(void)
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{
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u32 m, n;
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printf("\nMPU - 2000000\n");
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get_m_n_optimized(2000000, 12000, &m, &n);
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get_m_n_optimized(2000000, 13000, &m, &n);
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get_m_n_optimized(2000000, 16800, &m, &n);
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get_m_n_optimized(2000000, 19200, &m, &n);
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get_m_n_optimized(2000000, 26000, &m, &n);
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get_m_n_optimized(2000000, 27000, &m, &n);
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get_m_n_optimized(2000000, 38400, &m, &n);
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printf("\nMPU - 1200000\n");
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get_m_n_optimized(1200000, 12000, &m, &n);
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get_m_n_optimized(1200000, 13000, &m, &n);
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get_m_n_optimized(1200000, 16800, &m, &n);
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get_m_n_optimized(1200000, 19200, &m, &n);
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get_m_n_optimized(1200000, 26000, &m, &n);
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get_m_n_optimized(1200000, 27000, &m, &n);
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get_m_n_optimized(1200000, 38400, &m, &n);
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printf("\nMPU - 1584000\n");
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get_m_n_optimized(1584000, 12000, &m, &n);
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get_m_n_optimized(1584000, 13000, &m, &n);
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get_m_n_optimized(1584000, 16800, &m, &n);
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get_m_n_optimized(1584000, 19200, &m, &n);
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get_m_n_optimized(1584000, 26000, &m, &n);
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get_m_n_optimized(1584000, 27000, &m, &n);
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get_m_n_optimized(1584000, 38400, &m, &n);
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printf("\nCore 1600000\n");
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get_m_n_optimized(1600000, 12000, &m, &n);
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get_m_n_optimized(1600000, 13000, &m, &n);
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get_m_n_optimized(1600000, 16800, &m, &n);
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get_m_n_optimized(1600000, 19200, &m, &n);
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get_m_n_optimized(1600000, 26000, &m, &n);
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get_m_n_optimized(1600000, 27000, &m, &n);
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get_m_n_optimized(1600000, 38400, &m, &n);
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printf("\nPER 1536000\n");
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get_m_n_optimized(1536000, 12000, &m, &n);
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get_m_n_optimized(1536000, 13000, &m, &n);
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get_m_n_optimized(1536000, 16800, &m, &n);
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get_m_n_optimized(1536000, 19200, &m, &n);
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get_m_n_optimized(1536000, 26000, &m, &n);
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get_m_n_optimized(1536000, 27000, &m, &n);
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get_m_n_optimized(1536000, 38400, &m, &n);
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printf("\nIVA 1862000\n");
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get_m_n_optimized(1862000, 12000, &m, &n);
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get_m_n_optimized(1862000, 13000, &m, &n);
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get_m_n_optimized(1862000, 16800, &m, &n);
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get_m_n_optimized(1862000, 19200, &m, &n);
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get_m_n_optimized(1862000, 26000, &m, &n);
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get_m_n_optimized(1862000, 27000, &m, &n);
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get_m_n_optimized(1862000, 38400, &m, &n);
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printf("\nIVA Nitro - 1290000\n");
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get_m_n_optimized(1290000, 12000, &m, &n);
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get_m_n_optimized(1290000, 13000, &m, &n);
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get_m_n_optimized(1290000, 16800, &m, &n);
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get_m_n_optimized(1290000, 19200, &m, &n);
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get_m_n_optimized(1290000, 26000, &m, &n);
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get_m_n_optimized(1290000, 27000, &m, &n);
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get_m_n_optimized(1290000, 38400, &m, &n);
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printf("\nABE 196608 sys clk\n");
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get_m_n_optimized(196608, 12000, &m, &n);
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get_m_n_optimized(196608, 13000, &m, &n);
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get_m_n_optimized(196608, 16800, &m, &n);
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get_m_n_optimized(196608, 19200, &m, &n);
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get_m_n_optimized(196608, 26000, &m, &n);
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get_m_n_optimized(196608, 27000, &m, &n);
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get_m_n_optimized(196608, 38400, &m, &n);
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printf("\nABE 196608 32K\n");
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get_m_n_optimized(196608000/4, 32768, &m, &n);
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printf("\nUSB 1920000\n");
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get_m_n_optimized(1920000, 12000, &m, &n);
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get_m_n_optimized(1920000, 13000, &m, &n);
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get_m_n_optimized(1920000, 16800, &m, &n);
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get_m_n_optimized(1920000, 19200, &m, &n);
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get_m_n_optimized(1920000, 26000, &m, &n);
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get_m_n_optimized(1920000, 27000, &m, &n);
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get_m_n_optimized(1920000, 38400, &m, &n);
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printf("\nCore ES1 1523712\n");
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get_m_n_optimized(1524000, 12000, &m, &n);
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get_m_n_optimized(1524000, 13000, &m, &n);
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get_m_n_optimized(1524000, 16800, &m, &n);
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get_m_n_optimized(1524000, 19200, &m, &n);
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get_m_n_optimized(1524000, 26000, &m, &n);
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get_m_n_optimized(1524000, 27000, &m, &n);
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/* exact recommendation for SDPs */
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get_m_n_optimized(1523712, 38400, &m, &n);
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}
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