blob: cb27779a2290bbc311d81d2bcbbcecc2022dbe9e [file] [log] [blame]
wdenk945af8d2003-07-16 21:53:01 +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 <mpc5xxx.h>
26#include <asm/processor.h>
27
28/* ------------------------------------------------------------------------- */
29
30/* Bus-to-Core Multipliers */
31
32static int bus2core[] = {
33 0, 0, 0, 10, 20, 20, 25, 45,
34 30, 55, 40, 50, 0, 60, 35, 0,
35 30, 25, 65, 10, 70, 20, 75, 45,
36 0, 55, 40, 50, 80, 60, 35, 0
37};
38/* ------------------------------------------------------------------------- */
39
40/*
41 *
42 */
43
44int get_clocks (void)
45{
46 DECLARE_GLOBAL_DATA_PTR;
47
48 ulong val, vco;
49
50#if !defined(CFG_MPC5XXX_CLKIN)
51#error clock measuring not implemented yet - define CFG_MPC5XXX_CLKIN
52#endif
53
54 val = *(vu_long *)MPC5XXX_CDM_PORCFG;
55 if (val & (1 << 6)) {
56 vco = CFG_MPC5XXX_CLKIN * 12;
57 } else {
58 vco = CFG_MPC5XXX_CLKIN * 16;
59 }
60 if (val & (1 << 5)) {
61 gd->bus_clk = vco / 8;
62 } else {
63 gd->bus_clk = vco / 4;
64 }
65 gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 10;
66
67 val = *(vu_long *)MPC5XXX_CDM_CFG;
68 if (val & (1 << 8)) {
69 gd->ipb_clk = gd->bus_clk / 2;
70 } else {
71 gd->ipb_clk = gd->bus_clk;
72 }
73 switch (val & 3) {
74 case 0: gd->pci_clk = gd->ipb_clk; break;
75 case 1: gd->pci_clk = gd->ipb_clk / 2; break;
76 default: gd->pci_clk = gd->bus_clk / 4; break;
77 }
78
79 return (0);
80}
81
82int prt_mpc5xxx_clks (void)
83{
84 DECLARE_GLOBAL_DATA_PTR;
85
86 printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
87 gd->bus_clk / 1000000, gd->ipb_clk / 1000000,
88 gd->pci_clk / 1000000);
89
90 return (0);
91}
92
93/* ------------------------------------------------------------------------- */