2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
26 #include <asm/processor.h>
28 #ifdef CONFIG_AMIGAONEG3SE
29 #include "../board/MAI/AmigaOneG3SE/via686.h"
32 DECLARE_GLOBAL_DATA_PTR;
34 static const int hid1_multipliers_x_10[] = {
38 10, /* 0011 - bypass */
53 static const int hid1_fx_multipliers_x_10[] = {
56 10, /* 0010 - bypass */
57 10, /* 0011 - bypass */
71 85, /* 10001 - 8.5x */
73 95, /* 10011 - 9.5x */
74 100, /* 10100 - 10x */
75 110, /* 10101 - 11x */
76 120, /* 10110 - 12x */
80 /* ------------------------------------------------------------------------- */
83 * Measure CPU clock speed (core clock GCLK1, GCLK2)
85 * (Approx. GCLK frequency in Hz)
92 /* calculate the clock frequency based upon the CPU type */
93 switch (get_cpu_type()) {
98 * It is assumed that the PLL_EXT line is zero.
99 * Make sure division is done before multiplication to prevent 32-bit
100 * arithmetic overflows which will cause a negative number
102 clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF];
107 clock = CFG_BUS_CLK * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10;
121 * Make sure division is done before multiplication to prevent 32-bit
122 * arithmetic overflows which will cause a negative number
124 clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[get_hid1 () >> 28];
128 printf ("get_gclk_freq(): unknown CPU type\n");
134 gd->bus_clk = CFG_BUS_CLK;
139 /* ------------------------------------------------------------------------- */