1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright 2004 Freescale Semiconductor.
* (C) Copyright 2003 Motorola Inc.
* Xianghua Xiao, (X.Xiao@motorola.com)
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <ppc_asm.tmpl>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
/* --------------------------------------------------------------- */
void get_sys_info (sys_info_t * sysInfo)
{
volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
uint plat_ratio,e500_ratio,half_freqSystemBus;
plat_ratio = (gur->porpllsr) & 0x0000003e;
plat_ratio >>= 1;
sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
e500_ratio = (gur->porpllsr) & 0x003f0000;
e500_ratio >>= 16;
/* Divide before multiply to avoid integer
* overflow for processor speeds above 2GHz */
half_freqSystemBus = sysInfo->freqSystemBus/2;
sysInfo->freqProcessor = e500_ratio*half_freqSystemBus;
/* Note: freqDDRBus is the MCLK frequency, not the data rate. */
sysInfo->freqDDRBus = sysInfo->freqSystemBus;
#ifdef CONFIG_DDR_CLK_FREQ
{
u32 ddr_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO)
>> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
if (ddr_ratio != 0x7)
sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
}
#endif
}
int get_clocks (void)
{
sys_info_t sys_info;
#ifdef CONFIG_MPC8544
volatile ccsr_gur_t *gur = (void *) CFG_MPC85xx_GUTS_ADDR;
#endif
#if defined(CONFIG_CPM2)
volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR;
uint sccr, dfbrg;
/* set VCO = 4 * BRG */
cpm->im_cpm_intctl.sccr &= 0xfffffffc;
sccr = cpm->im_cpm_intctl.sccr;
dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
#endif
get_sys_info (&sys_info);
gd->cpu_clk = sys_info.freqProcessor;
gd->bus_clk = sys_info.freqSystemBus;
gd->mem_clk = sys_info.freqDDRBus;
/*
* The base clock for I2C depends on the actual SOC. Unfortunately,
* there is no pattern that can be used to determine the frequency, so
* the only choice is to look up the actual SOC number and use the value
* for that SOC. This information is taken from application note
* AN2919.
*/
#if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
gd->i2c1_clk = sys_info.freqSystemBus;
#elif defined(CONFIG_MPC8544)
/*
* On the 8544, the I2C clock is the same as the SEC clock. This can be
* either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See
* 4.4.3.3 of the 8544 RM. Note that this might actually work for all
* 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the
* PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544.
*/
if (gur->pordevsr2 & MPC85xx_PORDEVSR2_SEC_CFG)
gd->i2c1_clk = sys_info.freqSystemBus / 2;
else
gd->i2c1_clk = sys_info.freqSystemBus / 3;
#else
/* Most 85xx SOCs use CCB/2, so this is the default behavior. */
gd->i2c1_clk = sys_info.freqSystemBus / 2;
#endif
gd->i2c2_clk = gd->i2c1_clk;
#if defined(CONFIG_MPC8536)
gd->sdhc_clk = gd->bus_clk / 2;
#endif
#if defined(CONFIG_CPM2)
gd->vco_out = 2*sys_info.freqSystemBus;
gd->cpm_clk = gd->vco_out / 2;
gd->scc_clk = gd->vco_out / 4;
gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
#endif
if(gd->cpu_clk != 0) return (0);
else return (1);
}
/********************************************
* get_bus_freq
* return system bus freq in Hz
*********************************************/
ulong get_bus_freq (ulong dummy)
{
return gd->bus_clk;
}
/********************************************
* get_ddr_freq
* return ddr bus freq in Hz
*********************************************/
ulong get_ddr_freq (ulong dummy)
{
return gd->mem_clk;
}
|
