[people/ms/u-boot.git] / tools / omap / clocks_get_m_n.c

/*
 * Program for finding M & N values for DPLLs
 * To be run on Host PC
 *
 * (C) Copyright 2010
 * Texas Instruments, <www.ti.com>
 *
 * Aneesh V <aneesh@ti.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#include <stdlib.h>
#include <stdio.h>
typedef unsigned int u32;
#define MAX_N	127

/*
 * get_m_n_optimized() - Finds optimal DPLL multiplier(M) and divider(N)
 * values based on the reference frequency, required output frequency,
 * maximum tolerance for output frequency etc.
 *
 * target_freq_khz - output frequency required in KHz
 * ref_freq_khz - reference(input) frequency in KHz
 * m - pointer to computed M value
 * n - pointer to computed N value
 * tolerance_khz - tolerance for the output frequency. When the algorithm
 * succeeds in finding vialble M and N values the corresponding output
 * frequency will be in the range:
 *	[target_freq_khz - tolerance_khz, target_freq_khz]
 *
 * Formula:
 *	Fdpll = (2 * M * Fref) / (N + 1)
 *
 * Considerations for lock-time:
 *	- Smaller the N, better lock-time, especially lock-time will be
 *	- For acceptable lock-times:
 *		Fref / (M + 1) >= 1 MHz
 *
 * Considerations for power:
 *	- The difference in power for different N values giving the same
 *	  output is negligible. So, we optimize for lock-time
 *
 * Hard-constraints:
 *	- N can not be greater than 127(7 bit field for representing N)
 *
 * Usage:
 *	$ gcc clocks_get_m_n.c
 *	$ ./a.out
 */
int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 *M, u32 *N)
{
	u32 freq = target_freq_khz;
	u32 m_optimal, n_optimal, freq_optimal = 0, freq_old;
	u32 m, n;
	n = 1;
	while (1) {
		m = target_freq_khz / ref_freq_khz / 2 * n;
		freq_old = 0;
		while (1) {
			freq = ref_freq_khz * 2 * m / n;
			if (freq > target_freq_khz) {
				freq = freq_old;
				m--;
				break;
			}
			m++;
			freq_old = freq;
		}
		if (freq > freq_optimal) {
			freq_optimal = freq;
			m_optimal = m;
			n_optimal = n;
		}
		n++;
		if ((freq_optimal == target_freq_khz) ||
			((ref_freq_khz / n) < 1000)) {
			break;
		}
	}
	n--;
	*M = m_optimal;
	*N = n_optimal - 1;
	printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz,
		m_optimal, n_optimal - 1, target_freq_khz, freq_optimal);
	return 0;
}

void main(void)
{
	u32 m, n;
	printf("\nMPU - 2000000\n");
	get_m_n_optimized(2000000, 12000, &m, &n);
	get_m_n_optimized(2000000, 13000, &m, &n);
	get_m_n_optimized(2000000, 16800, &m, &n);
	get_m_n_optimized(2000000, 19200, &m, &n);
	get_m_n_optimized(2000000, 26000, &m, &n);
	get_m_n_optimized(2000000, 27000, &m, &n);
	get_m_n_optimized(2000000, 38400, &m, &n);

	printf("\nMPU - 1200000\n");
	get_m_n_optimized(1200000, 12000, &m, &n);
	get_m_n_optimized(1200000, 13000, &m, &n);
	get_m_n_optimized(1200000, 16800, &m, &n);
	get_m_n_optimized(1200000, 19200, &m, &n);
	get_m_n_optimized(1200000, 26000, &m, &n);
	get_m_n_optimized(1200000, 27000, &m, &n);
	get_m_n_optimized(1200000, 38400, &m, &n);

	printf("\nMPU - 1584000\n");
	get_m_n_optimized(1584000, 12000, &m, &n);
	get_m_n_optimized(1584000, 13000, &m, &n);
	get_m_n_optimized(1584000, 16800, &m, &n);
	get_m_n_optimized(1584000, 19200, &m, &n);
	get_m_n_optimized(1584000, 26000, &m, &n);
	get_m_n_optimized(1584000, 27000, &m, &n);
	get_m_n_optimized(1584000, 38400, &m, &n);

	printf("\nCore 1600000\n");
	get_m_n_optimized(1600000, 12000, &m, &n);
	get_m_n_optimized(1600000, 13000, &m, &n);
	get_m_n_optimized(1600000, 16800, &m, &n);
	get_m_n_optimized(1600000, 19200, &m, &n);
	get_m_n_optimized(1600000, 26000, &m, &n);
	get_m_n_optimized(1600000, 27000, &m, &n);
	get_m_n_optimized(1600000, 38400, &m, &n);

	printf("\nPER 1536000\n");
	get_m_n_optimized(1536000, 12000, &m, &n);
	get_m_n_optimized(1536000, 13000, &m, &n);
	get_m_n_optimized(1536000, 16800, &m, &n);
	get_m_n_optimized(1536000, 19200, &m, &n);
	get_m_n_optimized(1536000, 26000, &m, &n);
	get_m_n_optimized(1536000, 27000, &m, &n);
	get_m_n_optimized(1536000, 38400, &m, &n);

	printf("\nIVA 1862000\n");
	get_m_n_optimized(1862000, 12000, &m, &n);
	get_m_n_optimized(1862000, 13000, &m, &n);
	get_m_n_optimized(1862000, 16800, &m, &n);
	get_m_n_optimized(1862000, 19200, &m, &n);
	get_m_n_optimized(1862000, 26000, &m, &n);
	get_m_n_optimized(1862000, 27000, &m, &n);
	get_m_n_optimized(1862000, 38400, &m, &n);

	printf("\nIVA Nitro - 1290000\n");
	get_m_n_optimized(1290000, 12000, &m, &n);
	get_m_n_optimized(1290000, 13000, &m, &n);
	get_m_n_optimized(1290000, 16800, &m, &n);
	get_m_n_optimized(1290000, 19200, &m, &n);
	get_m_n_optimized(1290000, 26000, &m, &n);
	get_m_n_optimized(1290000, 27000, &m, &n);
	get_m_n_optimized(1290000, 38400, &m, &n);

	printf("\nABE 196608 sys clk\n");
	get_m_n_optimized(196608, 12000, &m, &n);
	get_m_n_optimized(196608, 13000, &m, &n);
	get_m_n_optimized(196608, 16800, &m, &n);
	get_m_n_optimized(196608, 19200, &m, &n);
	get_m_n_optimized(196608, 26000, &m, &n);
	get_m_n_optimized(196608, 27000, &m, &n);
	get_m_n_optimized(196608, 38400, &m, &n);

	printf("\nABE 196608 32K\n");
	get_m_n_optimized(196608000/4, 32768, &m, &n);

	printf("\nUSB 1920000\n");
	get_m_n_optimized(1920000, 12000, &m, &n);
	get_m_n_optimized(1920000, 13000, &m, &n);
	get_m_n_optimized(1920000, 16800, &m, &n);
	get_m_n_optimized(1920000, 19200, &m, &n);
	get_m_n_optimized(1920000, 26000, &m, &n);
	get_m_n_optimized(1920000, 27000, &m, &n);
	get_m_n_optimized(1920000, 38400, &m, &n);

	printf("\nCore ES1 1523712\n");
	get_m_n_optimized(1524000, 12000, &m, &n);
	get_m_n_optimized(1524000, 13000, &m, &n);
	get_m_n_optimized(1524000, 16800, &m, &n);
	get_m_n_optimized(1524000, 19200, &m, &n);
	get_m_n_optimized(1524000, 26000, &m, &n);
	get_m_n_optimized(1524000, 27000, &m, &n);

	/* exact recommendation for SDPs */
	get_m_n_optimized(1523712, 38400, &m, &n);

}
Commit	Line	Data
3776801d A	1	/*
	2	* Program for finding M & N values for DPLLs
	3	* To be run on Host PC
	4	*
	5	* (C) Copyright 2010
	6	* Texas Instruments, <www.ti.com>
	7	*
	8	* Aneesh V <aneesh@ti.com>
	9	*
	10	* See file CREDITS for list of people who contributed to this
	11	* project.
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License as
	15	* published by the Free Software Foundation; either version 2 of
	16	* the License, or (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	26	* MA 02111-1307 USA
	27	*/
	28	#include <stdlib.h>
	29	#include <stdio.h>
	30	typedef unsigned int u32;
	31	#define MAX_N 127
	32
	33	/*
	34	* get_m_n_optimized() - Finds optimal DPLL multiplier(M) and divider(N)
	35	* values based on the reference frequency, required output frequency,
	36	* maximum tolerance for output frequency etc.
	37	*
	38	* target_freq_khz - output frequency required in KHz
	39	* ref_freq_khz - reference(input) frequency in KHz
	40	* m - pointer to computed M value
	41	* n - pointer to computed N value
	42	* tolerance_khz - tolerance for the output frequency. When the algorithm
	43	* succeeds in finding vialble M and N values the corresponding output
	44	* frequency will be in the range:
	45	* [target_freq_khz - tolerance_khz, target_freq_khz]
	46	*
	47	* Formula:
	48	* Fdpll = (2 * M * Fref) / (N + 1)
	49	*
	50	* Considerations for lock-time:
	51	* - Smaller the N, better lock-time, especially lock-time will be
	52	* - For acceptable lock-times:
	53	* Fref / (M + 1) >= 1 MHz
	54	*
	55	* Considerations for power:
	56	* - The difference in power for different N values giving the same
	57	* output is negligible. So, we optimize for lock-time
	58	*
	59	* Hard-constraints:
	60	* - N can not be greater than 127(7 bit field for representing N)
	61	*
	62	* Usage:
	63	* $ gcc clocks_get_m_n.c
	64	* $ ./a.out
65	*/
28a181ff	66	int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 M, u32 N)
3776801d	67	{
28a181ff A	68	u32 freq = target_freq_khz;
	69	u32 m_optimal, n_optimal, freq_optimal = 0, freq_old;
	70	u32 m, n;
	71	n = 1;
3776801d	72	while (1) {
28a181ff	73	m = target_freq_khz / ref_freq_khz / 2 * n;
3776801d A	74	freq_old = 0;
3776801d A	75	while (1) {
28a181ff A	76	freq = ref_freq_khz * 2 * m / n;
28a181ff A	77	if (freq > target_freq_khz) {
3776801d	78	freq = freq_old;
28a181ff	79	m--;
3776801d A	80	break;
3776801d A	81	}
28a181ff	82	m++;
3776801d A	83	freq_old = freq;
3776801d A	84	}
28a181ff A	85	if (freq > freq_optimal) {
	86	freq_optimal = freq;
	87	m_optimal = m;
	88	n_optimal = n;
	89	}
	90	n++;
	91	if ((freq_optimal == target_freq_khz) \|\|
	92	((ref_freq_khz / n) < 1000)) {
3776801d	93	break;
3776801d A	94	}
3776801d A	95	}
28a181ff A	96	n--;
	97	*M = m_optimal;
	98	*N = n_optimal - 1;
	99	printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz,
	100	m_optimal, n_optimal - 1, target_freq_khz, freq_optimal);
3776801d A	101	return 0;
	102	}
	103
	104	void main(void)
	105	{
	106	u32 m, n;
	107	printf("\nMPU - 2000000\n");
28a181ff A	108	get_m_n_optimized(2000000, 12000, &m, &n);
	109	get_m_n_optimized(2000000, 13000, &m, &n);
	110	get_m_n_optimized(2000000, 16800, &m, &n);
	111	get_m_n_optimized(2000000, 19200, &m, &n);
	112	get_m_n_optimized(2000000, 26000, &m, &n);
	113	get_m_n_optimized(2000000, 27000, &m, &n);
	114	get_m_n_optimized(2000000, 38400, &m, &n);
3776801d A	115
3776801d A	116	printf("\nMPU - 1200000\n");
28a181ff A	117	get_m_n_optimized(1200000, 12000, &m, &n);
	118	get_m_n_optimized(1200000, 13000, &m, &n);
	119	get_m_n_optimized(1200000, 16800, &m, &n);
	120	get_m_n_optimized(1200000, 19200, &m, &n);
	121	get_m_n_optimized(1200000, 26000, &m, &n);
	122	get_m_n_optimized(1200000, 27000, &m, &n);
	123	get_m_n_optimized(1200000, 38400, &m, &n);
3776801d A	124
3776801d A	125	printf("\nMPU - 1584000\n");
28a181ff A	126	get_m_n_optimized(1584000, 12000, &m, &n);
	127	get_m_n_optimized(1584000, 13000, &m, &n);
	128	get_m_n_optimized(1584000, 16800, &m, &n);
	129	get_m_n_optimized(1584000, 19200, &m, &n);
	130	get_m_n_optimized(1584000, 26000, &m, &n);
	131	get_m_n_optimized(1584000, 27000, &m, &n);
	132	get_m_n_optimized(1584000, 38400, &m, &n);
3776801d A	133
3776801d A	134	printf("\nCore 1600000\n");
28a181ff A	135	get_m_n_optimized(1600000, 12000, &m, &n);
	136	get_m_n_optimized(1600000, 13000, &m, &n);
	137	get_m_n_optimized(1600000, 16800, &m, &n);
	138	get_m_n_optimized(1600000, 19200, &m, &n);
	139	get_m_n_optimized(1600000, 26000, &m, &n);
	140	get_m_n_optimized(1600000, 27000, &m, &n);
	141	get_m_n_optimized(1600000, 38400, &m, &n);
3776801d A	142
3776801d A	143	printf("\nPER 1536000\n");
28a181ff A	144	get_m_n_optimized(1536000, 12000, &m, &n);
	145	get_m_n_optimized(1536000, 13000, &m, &n);
	146	get_m_n_optimized(1536000, 16800, &m, &n);
	147	get_m_n_optimized(1536000, 19200, &m, &n);
	148	get_m_n_optimized(1536000, 26000, &m, &n);
	149	get_m_n_optimized(1536000, 27000, &m, &n);
	150	get_m_n_optimized(1536000, 38400, &m, &n);
3776801d A	151
3776801d A	152	printf("\nIVA 1862000\n");
28a181ff A	153	get_m_n_optimized(1862000, 12000, &m, &n);
	154	get_m_n_optimized(1862000, 13000, &m, &n);
	155	get_m_n_optimized(1862000, 16800, &m, &n);
	156	get_m_n_optimized(1862000, 19200, &m, &n);
	157	get_m_n_optimized(1862000, 26000, &m, &n);
	158	get_m_n_optimized(1862000, 27000, &m, &n);
	159	get_m_n_optimized(1862000, 38400, &m, &n);
	160
	161	printf("\nIVA Nitro - 1290000\n");
	162	get_m_n_optimized(1290000, 12000, &m, &n);
	163	get_m_n_optimized(1290000, 13000, &m, &n);
	164	get_m_n_optimized(1290000, 16800, &m, &n);
	165	get_m_n_optimized(1290000, 19200, &m, &n);
	166	get_m_n_optimized(1290000, 26000, &m, &n);
	167	get_m_n_optimized(1290000, 27000, &m, &n);
	168	get_m_n_optimized(1290000, 38400, &m, &n);
3776801d A	169
3776801d A	170	printf("\nABE 196608 sys clk\n");
28a181ff A	171	get_m_n_optimized(196608, 12000, &m, &n);
	172	get_m_n_optimized(196608, 13000, &m, &n);
	173	get_m_n_optimized(196608, 16800, &m, &n);
	174	get_m_n_optimized(196608, 19200, &m, &n);
	175	get_m_n_optimized(196608, 26000, &m, &n);
	176	get_m_n_optimized(196608, 27000, &m, &n);
	177	get_m_n_optimized(196608, 38400, &m, &n);
3776801d A	178
3776801d A	179	printf("\nABE 196608 32K\n");
28a181ff	180	get_m_n_optimized(196608000/4, 32768, &m, &n);
3776801d A	181
3776801d A	182	printf("\nUSB 1920000\n");
28a181ff A	183	get_m_n_optimized(1920000, 12000, &m, &n);
	184	get_m_n_optimized(1920000, 13000, &m, &n);
	185	get_m_n_optimized(1920000, 16800, &m, &n);
	186	get_m_n_optimized(1920000, 19200, &m, &n);
	187	get_m_n_optimized(1920000, 26000, &m, &n);
	188	get_m_n_optimized(1920000, 27000, &m, &n);
	189	get_m_n_optimized(1920000, 38400, &m, &n);
3776801d A	190
3776801d A	191	printf("\nCore ES1 1523712\n");
28a181ff A	192	get_m_n_optimized(1524000, 12000, &m, &n);
	193	get_m_n_optimized(1524000, 13000, &m, &n);
	194	get_m_n_optimized(1524000, 16800, &m, &n);
	195	get_m_n_optimized(1524000, 19200, &m, &n);
	196	get_m_n_optimized(1524000, 26000, &m, &n);
	197	get_m_n_optimized(1524000, 27000, &m, &n);
3776801d A	198
3776801d A	199	/* exact recommendation for SDPs */
28a181ff	200	get_m_n_optimized(1523712, 38400, &m, &n);
3776801d A	201
3776801d A	202	}