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945af8d7 WD |
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 <mpc5xxx.h> | |
26 | #include <asm/processor.h> | |
27 | ||
28 | /* ------------------------------------------------------------------------- */ | |
29 | ||
30 | /* Bus-to-Core Multipliers */ | |
31 | ||
32 | static int bus2core[] = { | |
7cb22f97 WD |
33 | 3, 2, 2, 2, 4, 4, 5, 9, |
34 | 6, 11, 8, 10, 3, 12, 7, 0, | |
35 | 6, 5, 13, 2, 14, 4, 15, 9, | |
36 | 0, 11, 8, 10, 16, 12, 7, 0 | |
945af8d7 WD |
37 | }; |
38 | /* ------------------------------------------------------------------------- */ | |
39 | ||
40 | /* | |
41 | * | |
42 | */ | |
43 | ||
44 | int 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 | } | |
7cb22f97 | 65 | gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 2; |
945af8d7 WD |
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 | ||
82 | int 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 | /* ------------------------------------------------------------------------- */ |