blob: fe553f125bb84325006927f587101b0f60a4da55 [file] [log] [blame]
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
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
28static const int hid1_multipliers_x_10[] = {
29 25, /* 0000 - 2.5x */
30 75, /* 0001 - 7.5x */
31 70, /* 0010 - 7x */
32 10, /* 0011 - bypass */
33 20, /* 0100 - 2x */
34 65, /* 0101 - 6.5x */
35 100, /* 0110 - 10x */
36 45, /* 0111 - 4.5x */
37 30, /* 1000 - 3x */
38 55, /* 1001 - 5.5x */
39 40, /* 1010 - 4x */
40 50, /* 1011 - 5x */
41 80, /* 1100 - 8x */
42 60, /* 1101 - 6x */
43 35, /* 1110 - 3.5x */
44 0 /* 1111 - off */
45};
46
47/* ------------------------------------------------------------------------- */
48
49/*
50 * Measure CPU clock speed (core clock GCLK1, GCLK2)
51 *
52 * (Approx. GCLK frequency in Hz)
53 */
54
55int get_clocks (void)
56{
57 DECLARE_GLOBAL_DATA_PTR;
58
59 ulong clock = CFG_BUS_CLK * \
60 hid1_multipliers_x_10[get_hid1 () >> 28] / 10;
61 gd->cpu_clk = clock;
62 gd->bus_clk = CFG_BUS_CLK;
63
64 return (0);
65}
66
67/* ------------------------------------------------------------------------- */
68
69#if 0 /* disabled XXX - use global data instead */
70ulong get_bus_freq (ulong gclk_freq)
71{
72 return CFG_BUS_CLK;
73}
74#endif /* 0 */
75
76/* ------------------------------------------------------------------------- */