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c021880a WD |
1 | /* |
2 | * (C) Copyright 2003 | |
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 <asm/inca-ip.h> | |
26 | ||
27 | ||
c021880a WD |
28 | /******************************************************************************* |
29 | * | |
8bde7f77 | 30 | * get_cpuclk - returns the frequency of the CPU. |
c021880a WD |
31 | * |
32 | * Gets the value directly from the INCA-IP hardware. | |
33 | * | |
8bde7f77 | 34 | * RETURNS: |
c021880a WD |
35 | * 150.000.000 for 150 MHz |
36 | * 130.000.000. for 130 Mhz | |
37 | * 100.000.000. for 100 Mhz | |
38 | * NOTE: | |
39 | * This functions should be used by the hardware driver to get the correct | |
40 | * frequency of the CPU. Don't use the macros, which are set to init the CPU | |
41 | * frequency in the ROM code. | |
42 | */ | |
43 | uint incaip_get_cpuclk(void) | |
44 | { | |
45 | /*-------------------------------------------------------------------------*/ | |
46 | /* CPU Clock Input Multiplexer (MUX I) */ | |
47 | /* Multiplexer MUX I selects the maximum input clock to the CPU. */ | |
48 | /*-------------------------------------------------------------------------*/ | |
49 | if (*((volatile ulong*)INCA_IP_CGU_CGU_MUXCR) & INCA_IP_CGU_CGU_MUXCR_MUXI) | |
50 | { | |
51 | /* MUX I set to 150 MHz clock */ | |
52 | return 150000000; | |
53 | } | |
54 | else | |
55 | { | |
56 | /* MUX I set to 100/133 MHz clock */ | |
8bde7f77 | 57 | if (*((volatile ulong*)INCA_IP_CGU_CGU_DIVCR) & 0x40) |
c021880a | 58 | { |
8bde7f77 WD |
59 | /* Division value is 1/3, maximum CPU operating */ |
60 | /* frequency is 133.3 MHz */ | |
61 | return 130000000; | |
c021880a WD |
62 | } |
63 | else | |
64 | { | |
8bde7f77 WD |
65 | /* Division value is 1/4, maximum CPU operating */ |
66 | /* frequency is 100 MHz */ | |
67 | return 100000000; | |
c021880a WD |
68 | } |
69 | } | |
70 | } | |
71 | ||
72 | /******************************************************************************* | |
73 | * | |
8bde7f77 | 74 | * get_fpiclk - returns the frequency of the FPI bus. |
c021880a WD |
75 | * |
76 | * Gets the value directly from the INCA-IP hardware. | |
77 | * | |
78 | * RETURNS: Frquency in Hz | |
79 | * | |
80 | * NOTE: | |
81 | * This functions should be used by the hardware driver to get the correct | |
82 | * frequency of the CPU. Don't use the macros, which are set to init the CPU | |
83 | * frequency in the ROM code. | |
8bde7f77 | 84 | * The calculation for the |
c021880a WD |
85 | */ |
86 | uint incaip_get_fpiclk(void) | |
87 | { | |
88 | uint clkCPU; | |
8bde7f77 | 89 | |
c021880a | 90 | clkCPU = incaip_get_cpuclk(); |
8bde7f77 | 91 | |
c021880a WD |
92 | switch (*((volatile ulong*)INCA_IP_CGU_CGU_DIVCR) & 0xC) |
93 | { | |
94 | case 0x4: | |
8bde7f77 WD |
95 | return clkCPU >> 1; /* devided by 2 */ |
96 | break; | |
c021880a | 97 | case 0x8: |
8bde7f77 WD |
98 | return clkCPU >> 2; /* devided by 4 */ |
99 | break; | |
c021880a | 100 | default: |
8bde7f77 WD |
101 | return clkCPU; |
102 | break; | |
c021880a WD |
103 | } |
104 | } |