summaryrefslogtreecommitdiff
path: root/arch/powerpc/cpu/74xx_7xx/speed.c
blob: f2fdcd5dc3dbe352e03728cf0fade7fb184a667b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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 <common.h>
#include <74xx_7xx.h>
#include <asm/processor.h>

#ifdef CONFIG_AMIGAONEG3SE
#include "../board/MAI/AmigaOneG3SE/via686.h"
#endif

DECLARE_GLOBAL_DATA_PTR;

extern unsigned long get_board_bus_clk (void);

static const int hid1_multipliers_x_10[] = {
	25,	/* 0000 - 2.5x */
	75,	/* 0001 - 7.5x */
	70,	/* 0010 - 7x */
	10,	/* 0011 - bypass */
	20,	/* 0100 - 2x */
	65,	/* 0101 - 6.5x */
	100,	/* 0110 - 10x */
	45,	/* 0111 - 4.5x */
	30,	/* 1000 - 3x */
	55,	/* 1001 - 5.5x */
	40,	/* 1010 - 4x */
	50,	/* 1011 - 5x */
	80,	/* 1100 - 8x */
	60,	/* 1101 - 6x */
	35,	/* 1110 - 3.5x */
	0	/* 1111 - off */
};

/* PLL_CFG[0:4] table for cpu 7448/7447A/7455/7457 */
static const int hid1_74xx_multipliers_x_10[] = {
	115,	/* 00000 - 11.5x  */
	170,	/* 00001 - 17x    */
	75,	/* 00010 -  7.5x  */
	150,	/* 00011 - 15x    */
	70,	/* 00100 -  7x    */
	180,	/* 00101 - 18x    */
	10,	/* 00110 - bypass */
	200,	/* 00111 - 20x    */
	20,	/* 01000 -  2x    */
	210,	/* 01001 - 21x    */
	65,	/* 01010 -  6.5x  */
	130,	/* 01011 - 13x    */
	85,	/* 01100 -  8.5x  */
	240,	/* 01101 - 24x    */
	95,	/* 01110 -  9.5x  */
	90,	/* 01111 -  9x    */
	30,	/* 10000 -  3x    */
	105,	/* 10001 - 10.5x  */
	55,	/* 10010 -  5.5x  */
	110,	/* 10011 - 11x    */
	40,	/* 10100 -  4x    */
	100,	/* 10101 - 10x    */
	50,	/* 10110 -  5x    */
	120,	/* 10111 - 12x    */
	80,	/* 11000 -  8x    */
	140,	/* 11001 - 14x    */
	60,	/* 11010 -  6x    */
	160,	/* 11011 - 16x    */
	135,	/* 11100 - 13.5x  */
	280,	/* 11101 - 28x    */
	0,	/* 11110 - off    */
	125	/* 11111 - 12.5x  */
};

static const int hid1_fx_multipliers_x_10[] = {
	00,	/* 0000 - off */
	00,	/* 0001 - off */
	10,	/* 0010 - bypass */
	10,	/* 0011 - bypass */
	20,	/* 0100 - 2x */
	25,	/* 0101 - 2.5x */
	30,	/* 0110 - 3x */
	35,	/* 0111 - 3.5x */
	40,	/* 1000 - 4x */
	45,	/* 1001 - 4.5x */
	50,	/* 1010 - 5x */
	55,	/* 1011 - 5.5x */
	60,	/* 1100 - 6x */
	65,	/* 1101 - 6.5x */
	70,	/* 1110 - 7x */
	75,	/* 1111 - 7.5 */
	80,	/* 10000 - 8x */
	85,	/* 10001 - 8.5x */
	90,	/* 10010 - 9x */
	95,	/* 10011 - 9.5x */
	100,	/* 10100 - 10x */
	110,	/* 10101 - 11x */
	120,	/* 10110 - 12x */
};


/* ------------------------------------------------------------------------- */

/*
 * Measure CPU clock speed (core clock GCLK1, GCLK2)
 *
 * (Approx. GCLK frequency in Hz)
 */

int get_clocks (void)
{
	ulong clock = 0;

#ifdef CONFIG_SYS_BUS_CLK
	gd->bus_clk = CONFIG_SYS_BUS_CLK;	/* bus clock is a fixed frequency */
#else
	gd->bus_clk = get_board_bus_clk ();	/* bus clock is configurable */
#endif

	/* calculate the clock frequency based upon the CPU type */
	switch (get_cpu_type()) {
	case CPU_7447A:
	case CPU_7448:
	case CPU_7455:
	case CPU_7457:
		/*
		 * Make sure division is done before multiplication to prevent 32-bit
		 * arithmetic overflows which will cause a negative number
		 */
		clock = (gd->bus_clk / 10) *
			hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
		break;

	case CPU_750GX:
	case CPU_750FX:
		clock = (gd->bus_clk / 10) *
			hid1_fx_multipliers_x_10[get_hid1 () >> 27];
		break;

	case CPU_7450:
	case CPU_740:
	case CPU_740P:
	case CPU_745:
	case CPU_750CX:
	case CPU_750:
	case CPU_750P:
	case CPU_755:
	case CPU_7400:
	case CPU_7410:
		/*
		 * Make sure division is done before multiplication to prevent 32-bit
		 * arithmetic overflows which will cause a negative number
		 */
		clock = (gd->bus_clk / 10) *
			hid1_multipliers_x_10[get_hid1 () >> 28];
		break;

	case CPU_UNKNOWN:
	       printf ("get_gclk_freq(): unknown CPU type\n");
	       clock = 0;
	       return (1);
	}

	gd->cpu_clk = clock;

	return (0);
}

/* ------------------------------------------------------------------------- */