[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>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#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	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
3776801d A	11	*/
	12	#include <stdlib.h>
	13	#include <stdio.h>
	14	typedef unsigned int u32;
	15	#define MAX_N 127
	16
	17	/*
	18	* get_m_n_optimized() - Finds optimal DPLL multiplier(M) and divider(N)
	19	* values based on the reference frequency, required output frequency,
	20	* maximum tolerance for output frequency etc.
	21	*
	22	* target_freq_khz - output frequency required in KHz
	23	* ref_freq_khz - reference(input) frequency in KHz
	24	* m - pointer to computed M value
	25	* n - pointer to computed N value
	26	* tolerance_khz - tolerance for the output frequency. When the algorithm
	27	* succeeds in finding vialble M and N values the corresponding output
	28	* frequency will be in the range:
	29	* [target_freq_khz - tolerance_khz, target_freq_khz]
	30	*
	31	* Formula:
	32	* Fdpll = (2 * M * Fref) / (N + 1)
	33	*
	34	* Considerations for lock-time:
	35	* - Smaller the N, better lock-time, especially lock-time will be
	36	* - For acceptable lock-times:
	37	* Fref / (M + 1) >= 1 MHz
	38	*
	39	* Considerations for power:
	40	* - The difference in power for different N values giving the same
	41	* output is negligible. So, we optimize for lock-time
	42	*
	43	* Hard-constraints:
	44	* - N can not be greater than 127(7 bit field for representing N)
	45	*
	46	* Usage:
	47	* $ gcc clocks_get_m_n.c
	48	* $ ./a.out
	49	*/
28a181ff	50	int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 M, u32 N)
3776801d	51	{
28a181ff A	52	u32 freq = target_freq_khz;
	53	u32 m_optimal, n_optimal, freq_optimal = 0, freq_old;
	54	u32 m, n;
	55	n = 1;
3776801d	56	while (1) {
28a181ff	57	m = target_freq_khz / ref_freq_khz / 2 * n;
3776801d A	58	freq_old = 0;
3776801d A	59	while (1) {
28a181ff A	60	freq = ref_freq_khz * 2 * m / n;
28a181ff A	61	if (freq > target_freq_khz) {
3776801d	62	freq = freq_old;
28a181ff	63	m--;
3776801d A	64	break;
3776801d A	65	}
28a181ff	66	m++;
3776801d A	67	freq_old = freq;
3776801d A	68	}
28a181ff A	69	if (freq > freq_optimal) {
	70	freq_optimal = freq;
	71	m_optimal = m;
	72	n_optimal = n;
	73	}
	74	n++;
	75	if ((freq_optimal == target_freq_khz) \|\|
	76	((ref_freq_khz / n) < 1000)) {
3776801d	77	break;
3776801d A	78	}
3776801d A	79	}
28a181ff A	80	n--;
	81	*M = m_optimal;
	82	*N = n_optimal - 1;
	83	printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz,
	84	m_optimal, n_optimal - 1, target_freq_khz, freq_optimal);
3776801d A	85	return 0;
	86	}
	87
	88	void main(void)
	89	{
	90	u32 m, n;
	91	printf("\nMPU - 2000000\n");
28a181ff A	92	get_m_n_optimized(2000000, 12000, &m, &n);
	93	get_m_n_optimized(2000000, 13000, &m, &n);
	94	get_m_n_optimized(2000000, 16800, &m, &n);
	95	get_m_n_optimized(2000000, 19200, &m, &n);
	96	get_m_n_optimized(2000000, 26000, &m, &n);
	97	get_m_n_optimized(2000000, 27000, &m, &n);
	98	get_m_n_optimized(2000000, 38400, &m, &n);
3776801d A	99
3776801d A	100	printf("\nMPU - 1200000\n");
28a181ff A	101	get_m_n_optimized(1200000, 12000, &m, &n);
	102	get_m_n_optimized(1200000, 13000, &m, &n);
	103	get_m_n_optimized(1200000, 16800, &m, &n);
	104	get_m_n_optimized(1200000, 19200, &m, &n);
	105	get_m_n_optimized(1200000, 26000, &m, &n);
	106	get_m_n_optimized(1200000, 27000, &m, &n);
	107	get_m_n_optimized(1200000, 38400, &m, &n);
3776801d A	108
3776801d A	109	printf("\nMPU - 1584000\n");
28a181ff A	110	get_m_n_optimized(1584000, 12000, &m, &n);
	111	get_m_n_optimized(1584000, 13000, &m, &n);
	112	get_m_n_optimized(1584000, 16800, &m, &n);
	113	get_m_n_optimized(1584000, 19200, &m, &n);
	114	get_m_n_optimized(1584000, 26000, &m, &n);
	115	get_m_n_optimized(1584000, 27000, &m, &n);
	116	get_m_n_optimized(1584000, 38400, &m, &n);
3776801d A	117
3776801d A	118	printf("\nCore 1600000\n");
28a181ff A	119	get_m_n_optimized(1600000, 12000, &m, &n);
	120	get_m_n_optimized(1600000, 13000, &m, &n);
	121	get_m_n_optimized(1600000, 16800, &m, &n);
	122	get_m_n_optimized(1600000, 19200, &m, &n);
	123	get_m_n_optimized(1600000, 26000, &m, &n);
	124	get_m_n_optimized(1600000, 27000, &m, &n);
	125	get_m_n_optimized(1600000, 38400, &m, &n);
3776801d A	126
3776801d A	127	printf("\nPER 1536000\n");
28a181ff A	128	get_m_n_optimized(1536000, 12000, &m, &n);
	129	get_m_n_optimized(1536000, 13000, &m, &n);
	130	get_m_n_optimized(1536000, 16800, &m, &n);
	131	get_m_n_optimized(1536000, 19200, &m, &n);
	132	get_m_n_optimized(1536000, 26000, &m, &n);
	133	get_m_n_optimized(1536000, 27000, &m, &n);
	134	get_m_n_optimized(1536000, 38400, &m, &n);
3776801d A	135
3776801d A	136	printf("\nIVA 1862000\n");
28a181ff A	137	get_m_n_optimized(1862000, 12000, &m, &n);
	138	get_m_n_optimized(1862000, 13000, &m, &n);
	139	get_m_n_optimized(1862000, 16800, &m, &n);
	140	get_m_n_optimized(1862000, 19200, &m, &n);
	141	get_m_n_optimized(1862000, 26000, &m, &n);
	142	get_m_n_optimized(1862000, 27000, &m, &n);
	143	get_m_n_optimized(1862000, 38400, &m, &n);
	144
	145	printf("\nIVA Nitro - 1290000\n");
	146	get_m_n_optimized(1290000, 12000, &m, &n);
	147	get_m_n_optimized(1290000, 13000, &m, &n);
	148	get_m_n_optimized(1290000, 16800, &m, &n);
	149	get_m_n_optimized(1290000, 19200, &m, &n);
	150	get_m_n_optimized(1290000, 26000, &m, &n);
	151	get_m_n_optimized(1290000, 27000, &m, &n);
	152	get_m_n_optimized(1290000, 38400, &m, &n);
3776801d A	153
3776801d A	154	printf("\nABE 196608 sys clk\n");
28a181ff A	155	get_m_n_optimized(196608, 12000, &m, &n);
	156	get_m_n_optimized(196608, 13000, &m, &n);
	157	get_m_n_optimized(196608, 16800, &m, &n);
	158	get_m_n_optimized(196608, 19200, &m, &n);
	159	get_m_n_optimized(196608, 26000, &m, &n);
	160	get_m_n_optimized(196608, 27000, &m, &n);
	161	get_m_n_optimized(196608, 38400, &m, &n);
3776801d A	162
3776801d A	163	printf("\nABE 196608 32K\n");
28a181ff	164	get_m_n_optimized(196608000/4, 32768, &m, &n);
3776801d A	165
3776801d A	166	printf("\nUSB 1920000\n");
28a181ff A	167	get_m_n_optimized(1920000, 12000, &m, &n);
	168	get_m_n_optimized(1920000, 13000, &m, &n);
	169	get_m_n_optimized(1920000, 16800, &m, &n);
	170	get_m_n_optimized(1920000, 19200, &m, &n);
	171	get_m_n_optimized(1920000, 26000, &m, &n);
	172	get_m_n_optimized(1920000, 27000, &m, &n);
	173	get_m_n_optimized(1920000, 38400, &m, &n);
3776801d A	174
3776801d A	175	printf("\nCore ES1 1523712\n");
28a181ff A	176	get_m_n_optimized(1524000, 12000, &m, &n);
	177	get_m_n_optimized(1524000, 13000, &m, &n);
	178	get_m_n_optimized(1524000, 16800, &m, &n);
	179	get_m_n_optimized(1524000, 19200, &m, &n);
	180	get_m_n_optimized(1524000, 26000, &m, &n);
	181	get_m_n_optimized(1524000, 27000, &m, &n);
3776801d A	182
3776801d A	183	/* exact recommendation for SDPs */
28a181ff	184	get_m_n_optimized(1523712, 38400, &m, &n);
3776801d A	185
3776801d A	186	}