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wdenk4a9cbbe2002-08-27 09:48:53 +00001/*
2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wdenk3a473b22004-01-03 00:43:19 +000015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wdenk4a9cbbe2002-08-27 09:48:53 +000016 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25#include <74xx_7xx.h>
26#include <asm/processor.h>
27
wdenkc7de8292002-11-19 11:04:11 +000028#ifdef CONFIG_AMIGAONEG3SE
29#include "../board/MAI/AmigaOneG3SE/via686.h"
30#endif
31
wdenk4a9cbbe2002-08-27 09:48:53 +000032static const int hid1_multipliers_x_10[] = {
33 25, /* 0000 - 2.5x */
34 75, /* 0001 - 7.5x */
35 70, /* 0010 - 7x */
36 10, /* 0011 - bypass */
37 20, /* 0100 - 2x */
38 65, /* 0101 - 6.5x */
39 100, /* 0110 - 10x */
40 45, /* 0111 - 4.5x */
41 30, /* 1000 - 3x */
42 55, /* 1001 - 5.5x */
43 40, /* 1010 - 4x */
44 50, /* 1011 - 5x */
45 80, /* 1100 - 8x */
46 60, /* 1101 - 6x */
47 35, /* 1110 - 3.5x */
48 0 /* 1111 - off */
49};
50
wdenk72755c72003-06-20 23:10:58 +000051static const int hid1_fx_multipliers_x_10[] = {
wdenk3a473b22004-01-03 00:43:19 +000052 00, /* 0000 - off */
53 00, /* 0001 - off */
54 10, /* 0010 - bypass */
55 10, /* 0011 - bypass */
56 20, /* 0100 - 2x */
57 25, /* 0101 - 2.5x */
58 30, /* 0110 - 3x */
59 35, /* 0111 - 3.5x */
60 40, /* 1000 - 4x */
61 45, /* 1001 - 4.5x */
62 50, /* 1010 - 5x */
63 55, /* 1011 - 5.5x */
64 60, /* 1100 - 6x */
65 65, /* 1101 - 6.5x */
66 70, /* 1110 - 7x */
67 75, /* 1111 - 7.5 */
68 80, /* 10000 - 8x */
69 85, /* 10001 - 8.5x */
70 90, /* 10010 - 9x */
71 95, /* 10011 - 9.5x */
72 100, /* 10100 - 10x */
73 110, /* 10101 - 11x */
74 120, /* 10110 - 12x */
wdenk72755c72003-06-20 23:10:58 +000075};
76
77
wdenk4a9cbbe2002-08-27 09:48:53 +000078/* ------------------------------------------------------------------------- */
79
80/*
81 * Measure CPU clock speed (core clock GCLK1, GCLK2)
82 *
83 * (Approx. GCLK frequency in Hz)
84 */
85
86int get_clocks (void)
87{
88 DECLARE_GLOBAL_DATA_PTR;
wdenk3a473b22004-01-03 00:43:19 +000089 ulong clock = 0;
90
91 /* calculate the clock frequency based upon the CPU type */
92 switch (get_cpu_type()) {
93 case CPU_7455:
94 case CPU_7457:
95 /*
96 * It is assumed that the PLL_EXT line is zero.
97 * Make sure division is done before multiplication to prevent 32-bit
98 * arithmetic overflows which will cause a negative number
99 */
100 clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF];
101 break;
102
103 case CPU_750GX:
104 case CPU_750FX:
105 clock = CFG_BUS_CLK * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10;
106 break;
107
108 case CPU_7450:
109 case CPU_740:
110 case CPU_740P:
111 case CPU_745:
112 case CPU_750CX:
113 case CPU_750:
114 case CPU_750P:
115 case CPU_755:
116 case CPU_7400:
117 case CPU_7410:
118 /*
119 * Make sure division is done before multiplication to prevent 32-bit
120 * arithmetic overflows which will cause a negative number
121 */
122 clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[get_hid1 () >> 28];
123 break;
124
125 case CPU_UNKNOWN:
126 printf ("get_gclk_freq(): unknown CPU type\n");
127 clock = 0;
128 return (1);
129 }
130
wdenk4a9cbbe2002-08-27 09:48:53 +0000131 gd->cpu_clk = clock;
132 gd->bus_clk = CFG_BUS_CLK;
133
134 return (0);
135}
136
137/* ------------------------------------------------------------------------- */