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42d1f039 | 1 | /* |
97d80fc3 | 2 | * Copyright 2004 Freescale Semiconductor. |
42d1f039 WD |
3 | * (C) Copyright 2003 Motorola Inc. |
4 | * Xianghua Xiao, (X.Xiao@motorola.com) | |
5 | * | |
6 | * (C) Copyright 2000 | |
7 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
8 | * | |
9 | * See file CREDITS for list of people who contributed to this | |
10 | * project. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of | |
15 | * the License, or (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
25 | * MA 02111-1307 USA | |
26 | */ | |
27 | ||
28 | #include <common.h> | |
29 | #include <ppc_asm.tmpl> | |
30 | #include <asm/processor.h> | |
31 | ||
d87080b7 WD |
32 | DECLARE_GLOBAL_DATA_PTR; |
33 | ||
42d1f039 WD |
34 | /* --------------------------------------------------------------- */ |
35 | ||
42d1f039 WD |
36 | void get_sys_info (sys_info_t * sysInfo) |
37 | { | |
38 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
39 | volatile ccsr_gur_t *gur = &immap->im_gur; | |
66ed6cca | 40 | uint plat_ratio,e500_ratio,half_freqSystemBus; |
42d1f039 WD |
41 | |
42 | plat_ratio = (gur->porpllsr) & 0x0000003e; | |
43 | plat_ratio >>= 1; | |
66ed6cca | 44 | sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; |
42d1f039 WD |
45 | e500_ratio = (gur->porpllsr) & 0x003f0000; |
46 | e500_ratio >>= 16; | |
66ed6cca AF |
47 | |
48 | /* Divide before multiply to avoid integer | |
49 | * overflow for processor speeds above 2GHz */ | |
50 | half_freqSystemBus = sysInfo->freqSystemBus/2; | |
51 | sysInfo->freqProcessor = e500_ratio*half_freqSystemBus; | |
42d1f039 WD |
52 | } |
53 | ||
66ed6cca | 54 | |
42d1f039 WD |
55 | int get_clocks (void) |
56 | { | |
42d1f039 | 57 | sys_info_t sys_info; |
9c4c5ae3 | 58 | #if defined(CONFIG_CPM2) |
42d1f039 WD |
59 | volatile immap_t *immap = (immap_t *) CFG_IMMR; |
60 | uint sccr, dfbrg; | |
61 | ||
62 | /* set VCO = 4 * BRG */ | |
63 | immap->im_cpm.im_cpm_intctl.sccr &= 0xfffffffc; | |
64 | sccr = immap->im_cpm.im_cpm_intctl.sccr; | |
65 | dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT; | |
66 | #endif | |
67 | get_sys_info (&sys_info); | |
68 | gd->cpu_clk = sys_info.freqProcessor; | |
69 | gd->bus_clk = sys_info.freqSystemBus; | |
9c4c5ae3 | 70 | #if defined(CONFIG_CPM2) |
42d1f039 WD |
71 | gd->vco_out = 2*sys_info.freqSystemBus; |
72 | gd->cpm_clk = gd->vco_out / 2; | |
73 | gd->scc_clk = gd->vco_out / 4; | |
74 | gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1))); | |
75 | #endif | |
76 | ||
77 | if(gd->cpu_clk != 0) return (0); | |
78 | else return (1); | |
79 | } | |
80 | ||
81 | ||
82 | /******************************************** | |
83 | * get_bus_freq | |
84 | * return system bus freq in Hz | |
85 | *********************************************/ | |
86 | ulong get_bus_freq (ulong dummy) | |
87 | { | |
88 | ulong val; | |
89 | ||
90 | sys_info_t sys_info; | |
91 | ||
92 | get_sys_info (&sys_info); | |
93 | val = sys_info.freqSystemBus; | |
94 | ||
95 | return val; | |
96 | } |