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1 | /* | |
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 | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * 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 | ||
28 | #ifdef CONFIG_AMIGAONEG3SE | |
29 | #include "../board/MAI/AmigaOneG3SE/via686.h" | |
30 | #endif | |
31 | ||
32 | DECLARE_GLOBAL_DATA_PTR; | |
33 | ||
34 | extern unsigned long get_board_bus_clk (void); | |
35 | ||
36 | static const int hid1_multipliers_x_10[] = { | |
37 | 25, /* 0000 - 2.5x */ | |
38 | 75, /* 0001 - 7.5x */ | |
39 | 70, /* 0010 - 7x */ | |
40 | 10, /* 0011 - bypass */ | |
41 | 20, /* 0100 - 2x */ | |
42 | 65, /* 0101 - 6.5x */ | |
43 | 100, /* 0110 - 10x */ | |
44 | 45, /* 0111 - 4.5x */ | |
45 | 30, /* 1000 - 3x */ | |
46 | 55, /* 1001 - 5.5x */ | |
47 | 40, /* 1010 - 4x */ | |
48 | 50, /* 1011 - 5x */ | |
49 | 80, /* 1100 - 8x */ | |
50 | 60, /* 1101 - 6x */ | |
51 | 35, /* 1110 - 3.5x */ | |
52 | 0 /* 1111 - off */ | |
53 | }; | |
54 | ||
55 | /* PLL_CFG[0:4] table for cpu 7448/7447A/7455/7457 */ | |
56 | static const int hid1_74xx_multipliers_x_10[] = { | |
57 | 115, /* 00000 - 11.5x */ | |
58 | 170, /* 00001 - 17x */ | |
59 | 75, /* 00010 - 7.5x */ | |
60 | 150, /* 00011 - 15x */ | |
61 | 70, /* 00100 - 7x */ | |
62 | 180, /* 00101 - 18x */ | |
63 | 10, /* 00110 - bypass */ | |
64 | 200, /* 00111 - 20x */ | |
65 | 20, /* 01000 - 2x */ | |
66 | 210, /* 01001 - 21x */ | |
67 | 65, /* 01010 - 6.5x */ | |
68 | 130, /* 01011 - 13x */ | |
69 | 85, /* 01100 - 8.5x */ | |
70 | 240, /* 01101 - 24x */ | |
71 | 95, /* 01110 - 9.5x */ | |
72 | 90, /* 01111 - 9x */ | |
73 | 30, /* 10000 - 3x */ | |
74 | 105, /* 10001 - 10.5x */ | |
75 | 55, /* 10010 - 5.5x */ | |
76 | 110, /* 10011 - 11x */ | |
77 | 40, /* 10100 - 4x */ | |
78 | 100, /* 10101 - 10x */ | |
79 | 50, /* 10110 - 5x */ | |
80 | 120, /* 10111 - 12x */ | |
81 | 80, /* 11000 - 8x */ | |
82 | 140, /* 11001 - 14x */ | |
83 | 60, /* 11010 - 6x */ | |
84 | 160, /* 11011 - 16x */ | |
85 | 135, /* 11100 - 13.5x */ | |
86 | 280, /* 11101 - 28x */ | |
87 | 0, /* 11110 - off */ | |
88 | 125 /* 11111 - 12.5x */ | |
89 | }; | |
90 | ||
91 | static const int hid1_fx_multipliers_x_10[] = { | |
92 | 00, /* 0000 - off */ | |
93 | 00, /* 0001 - off */ | |
94 | 10, /* 0010 - bypass */ | |
95 | 10, /* 0011 - bypass */ | |
96 | 20, /* 0100 - 2x */ | |
97 | 25, /* 0101 - 2.5x */ | |
98 | 30, /* 0110 - 3x */ | |
99 | 35, /* 0111 - 3.5x */ | |
100 | 40, /* 1000 - 4x */ | |
101 | 45, /* 1001 - 4.5x */ | |
102 | 50, /* 1010 - 5x */ | |
103 | 55, /* 1011 - 5.5x */ | |
104 | 60, /* 1100 - 6x */ | |
105 | 65, /* 1101 - 6.5x */ | |
106 | 70, /* 1110 - 7x */ | |
107 | 75, /* 1111 - 7.5 */ | |
108 | 80, /* 10000 - 8x */ | |
109 | 85, /* 10001 - 8.5x */ | |
110 | 90, /* 10010 - 9x */ | |
111 | 95, /* 10011 - 9.5x */ | |
112 | 100, /* 10100 - 10x */ | |
113 | 110, /* 10101 - 11x */ | |
114 | 120, /* 10110 - 12x */ | |
115 | }; | |
116 | ||
117 | ||
118 | /* ------------------------------------------------------------------------- */ | |
119 | ||
120 | /* | |
121 | * Measure CPU clock speed (core clock GCLK1, GCLK2) | |
122 | * | |
123 | * (Approx. GCLK frequency in Hz) | |
124 | */ | |
125 | ||
126 | int get_clocks (void) | |
127 | { | |
128 | ulong clock = 0; | |
129 | ||
130 | #ifdef CONFIG_SYS_BUS_CLK | |
131 | gd->bus_clk = CONFIG_SYS_BUS_CLK; /* bus clock is a fixed frequency */ | |
132 | #else | |
133 | gd->bus_clk = get_board_bus_clk (); /* bus clock is configurable */ | |
134 | #endif | |
135 | ||
136 | /* calculate the clock frequency based upon the CPU type */ | |
137 | switch (get_cpu_type()) { | |
138 | case CPU_7447A: | |
139 | case CPU_7448: | |
140 | case CPU_7455: | |
141 | case CPU_7457: | |
142 | /* | |
143 | * Make sure division is done before multiplication to prevent 32-bit | |
144 | * arithmetic overflows which will cause a negative number | |
145 | */ | |
146 | clock = (gd->bus_clk / 10) * | |
147 | hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F]; | |
148 | break; | |
149 | ||
150 | case CPU_750GX: | |
151 | case CPU_750FX: | |
152 | clock = gd->bus_clk * | |
153 | hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10; | |
154 | break; | |
155 | ||
156 | case CPU_7450: | |
157 | case CPU_740: | |
158 | case CPU_740P: | |
159 | case CPU_745: | |
160 | case CPU_750CX: | |
161 | case CPU_750: | |
162 | case CPU_750P: | |
163 | case CPU_755: | |
164 | case CPU_7400: | |
165 | case CPU_7410: | |
166 | /* | |
167 | * Make sure division is done before multiplication to prevent 32-bit | |
168 | * arithmetic overflows which will cause a negative number | |
169 | */ | |
170 | clock = (gd->bus_clk / 10) * | |
171 | hid1_multipliers_x_10[get_hid1 () >> 28]; | |
172 | break; | |
173 | ||
174 | case CPU_UNKNOWN: | |
175 | printf ("get_gclk_freq(): unknown CPU type\n"); | |
176 | clock = 0; | |
177 | return (1); | |
178 | } | |
179 | ||
180 | gd->cpu_clk = clock; | |
181 | ||
182 | return (0); | |
183 | } | |
184 | ||
185 | /* ------------------------------------------------------------------------- */ |