2 * Copyright 2004 Freescale Semiconductor.
3 * (C) Copyright 2003 Motorola Inc.
4 * Xianghua Xiao, (X.Xiao@motorola.com)
7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 * See file CREDITS for list of people who contributed to this
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.
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.
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,
29 #include <ppc_asm.tmpl>
30 #include <asm/processor.h>
32 DECLARE_GLOBAL_DATA_PTR
;
34 /* --------------------------------------------------------------- */
36 void get_sys_info (sys_info_t
* sysInfo
)
38 volatile ccsr_gur_t
*gur
= (void *)(CFG_MPC85xx_GUTS_ADDR
);
39 uint plat_ratio
,e500_ratio
,half_freqSystemBus
;
41 plat_ratio
= (gur
->porpllsr
) & 0x0000003e;
43 sysInfo
->freqSystemBus
= plat_ratio
* CONFIG_SYS_CLK_FREQ
;
44 e500_ratio
= (gur
->porpllsr
) & 0x003f0000;
47 /* Divide before multiply to avoid integer
48 * overflow for processor speeds above 2GHz */
49 half_freqSystemBus
= sysInfo
->freqSystemBus
/2;
50 sysInfo
->freqProcessor
= e500_ratio
*half_freqSystemBus
;
52 /* Note: freqDDRBus is the MCLK frequency, not the data rate. */
53 sysInfo
->freqDDRBus
= sysInfo
->freqSystemBus
;
55 #ifdef CONFIG_DDR_CLK_FREQ
57 u32 ddr_ratio
= ((gur
->porpllsr
) & 0x00003e00) >> 9;
59 sysInfo
->freqDDRBus
= ddr_ratio
* CONFIG_DDR_CLK_FREQ
;
69 volatile ccsr_gur_t
*gur
= (void *) CFG_MPC85xx_GUTS_ADDR
;
71 #if defined(CONFIG_CPM2)
72 volatile ccsr_cpm_t
*cpm
= (ccsr_cpm_t
*)CFG_MPC85xx_CPM_ADDR
;
75 /* set VCO = 4 * BRG */
76 cpm
->im_cpm_intctl
.sccr
&= 0xfffffffc;
77 sccr
= cpm
->im_cpm_intctl
.sccr
;
78 dfbrg
= (sccr
& SCCR_DFBRG_MSK
) >> SCCR_DFBRG_SHIFT
;
80 get_sys_info (&sys_info
);
81 gd
->cpu_clk
= sys_info
.freqProcessor
;
82 gd
->bus_clk
= sys_info
.freqSystemBus
;
83 gd
->mem_clk
= sys_info
.freqDDRBus
;
86 * The base clock for I2C depends on the actual SOC. Unfortunately,
87 * there is no pattern that can be used to determine the frequency, so
88 * the only choice is to look up the actual SOC number and use the value
89 * for that SOC. This information is taken from application note
92 #if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
93 defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
94 gd
->i2c1_clk
= sys_info
.freqSystemBus
;
95 #elif defined(CONFIG_MPC8544)
97 * On the 8544, the I2C clock is the same as the SEC clock. This can be
98 * either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See
99 * 4.4.3.3 of the 8544 RM. Note that this might actually work for all
100 * 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the
101 * PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544.
103 if (gur
->pordevsr2
& MPC85xx_PORDEVSR2_SEC_CFG
)
104 gd
->i2c1_clk
= sys_info
.freqSystemBus
/ 3;
106 gd
->i2c1_clk
= sys_info
.freqSystemBus
/ 2;
108 /* Most 85xx SOCs use CCB/2, so this is the default behavior. */
109 gd
->i2c1_clk
= sys_info
.freqSystemBus
/ 2;
111 gd
->i2c2_clk
= gd
->i2c1_clk
;
113 #if defined(CONFIG_CPM2)
114 gd
->vco_out
= 2*sys_info
.freqSystemBus
;
115 gd
->cpm_clk
= gd
->vco_out
/ 2;
116 gd
->scc_clk
= gd
->vco_out
/ 4;
117 gd
->brg_clk
= gd
->vco_out
/ (1 << (2 * (dfbrg
+ 1)));
120 if(gd
->cpu_clk
!= 0) return (0);
125 /********************************************
127 * return system bus freq in Hz
128 *********************************************/
129 ulong
get_bus_freq (ulong dummy
)
134 /********************************************
136 * return ddr bus freq in Hz
137 *********************************************/
138 ulong
get_ddr_freq (ulong dummy
)