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wdenk42d1f032003-10-15 23:53:47 +00001/*
wdenk97d80fc2004-06-09 00:34:46 +00002 * Copyright 2004 Freescale Semiconductor.
wdenk42d1f032003-10-15 23:53:47 +00003 * (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
Wolfgang Denkd87080b2006-03-31 18:32:53 +020032DECLARE_GLOBAL_DATA_PTR;
33
wdenk42d1f032003-10-15 23:53:47 +000034/* --------------------------------------------------------------- */
35
wdenk42d1f032003-10-15 23:53:47 +000036void get_sys_info (sys_info_t * sysInfo)
37{
Kumar Galaf59b55a2007-11-27 23:25:02 -060038 volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
Andy Fleming66ed6cc2007-04-23 02:37:47 -050039 uint plat_ratio,e500_ratio,half_freqSystemBus;
wdenk42d1f032003-10-15 23:53:47 +000040
41 plat_ratio = (gur->porpllsr) & 0x0000003e;
42 plat_ratio >>= 1;
Andy Fleming66ed6cc2007-04-23 02:37:47 -050043 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
wdenk42d1f032003-10-15 23:53:47 +000044 e500_ratio = (gur->porpllsr) & 0x003f0000;
45 e500_ratio >>= 16;
Andy Fleming66ed6cc2007-04-23 02:37:47 -050046
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;
James Yanga3e77fa2008-02-08 18:05:08 -060051
52 /* Note: freqDDRBus is the MCLK frequency, not the data rate. */
Kumar Galad4357932007-12-07 04:59:26 -060053 sysInfo->freqDDRBus = sysInfo->freqSystemBus;
54
55#ifdef CONFIG_DDR_CLK_FREQ
56 {
Jason Jinc0391112008-09-27 14:40:57 +080057 u32 ddr_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO)
58 >> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
Kumar Galad4357932007-12-07 04:59:26 -060059 if (ddr_ratio != 0x7)
60 sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
61 }
62#endif
wdenk42d1f032003-10-15 23:53:47 +000063}
64
Andy Fleming66ed6cc2007-04-23 02:37:47 -050065
wdenk42d1f032003-10-15 23:53:47 +000066int get_clocks (void)
67{
wdenk42d1f032003-10-15 23:53:47 +000068 sys_info_t sys_info;
Timur Tabi88353a92008-04-04 11:15:58 -050069#ifdef CONFIG_MPC8544
70 volatile ccsr_gur_t *gur = (void *) CFG_MPC85xx_GUTS_ADDR;
71#endif
Jon Loeliger9c4c5ae2005-07-23 10:37:35 -050072#if defined(CONFIG_CPM2)
Kumar Galaaafeefb2007-11-28 00:36:33 -060073 volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR;
wdenk42d1f032003-10-15 23:53:47 +000074 uint sccr, dfbrg;
75
76 /* set VCO = 4 * BRG */
Kumar Galaaafeefb2007-11-28 00:36:33 -060077 cpm->im_cpm_intctl.sccr &= 0xfffffffc;
78 sccr = cpm->im_cpm_intctl.sccr;
wdenk42d1f032003-10-15 23:53:47 +000079 dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
80#endif
81 get_sys_info (&sys_info);
82 gd->cpu_clk = sys_info.freqProcessor;
83 gd->bus_clk = sys_info.freqSystemBus;
James Yanga3e77fa2008-02-08 18:05:08 -060084 gd->mem_clk = sys_info.freqDDRBus;
Timur Tabi88353a92008-04-04 11:15:58 -050085
86 /*
87 * The base clock for I2C depends on the actual SOC. Unfortunately,
88 * there is no pattern that can be used to determine the frequency, so
89 * the only choice is to look up the actual SOC number and use the value
90 * for that SOC. This information is taken from application note
91 * AN2919.
92 */
93#if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
94 defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
Timur Tabi943afa22008-01-09 14:35:26 -060095 gd->i2c1_clk = sys_info.freqSystemBus;
Timur Tabi88353a92008-04-04 11:15:58 -050096#elif defined(CONFIG_MPC8544)
97 /*
98 * On the 8544, the I2C clock is the same as the SEC clock. This can be
99 * either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See
100 * 4.4.3.3 of the 8544 RM. Note that this might actually work for all
101 * 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the
102 * PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544.
103 */
104 if (gur->pordevsr2 & MPC85xx_PORDEVSR2_SEC_CFG)
105 gd->i2c1_clk = sys_info.freqSystemBus / 3;
106 else
107 gd->i2c1_clk = sys_info.freqSystemBus / 2;
108#else
109 /* Most 85xx SOCs use CCB/2, so this is the default behavior. */
110 gd->i2c1_clk = sys_info.freqSystemBus / 2;
111#endif
112 gd->i2c2_clk = gd->i2c1_clk;
Timur Tabi943afa22008-01-09 14:35:26 -0600113
Kumar Galaef50d6c2008-08-12 11:14:19 -0500114#if defined(CONFIG_MPC8536)
115 gd->sdhc_clk = gd->bus_clk / 2;
116#endif
117
Jon Loeliger9c4c5ae2005-07-23 10:37:35 -0500118#if defined(CONFIG_CPM2)
wdenk42d1f032003-10-15 23:53:47 +0000119 gd->vco_out = 2*sys_info.freqSystemBus;
120 gd->cpm_clk = gd->vco_out / 2;
121 gd->scc_clk = gd->vco_out / 4;
122 gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
123#endif
124
125 if(gd->cpu_clk != 0) return (0);
126 else return (1);
127}
128
129
130/********************************************
131 * get_bus_freq
132 * return system bus freq in Hz
133 *********************************************/
134ulong get_bus_freq (ulong dummy)
135{
James Yanga3e77fa2008-02-08 18:05:08 -0600136 return gd->bus_clk;
wdenk42d1f032003-10-15 23:53:47 +0000137}
Kumar Galad4357932007-12-07 04:59:26 -0600138
139/********************************************
140 * get_ddr_freq
141 * return ddr bus freq in Hz
142 *********************************************/
143ulong get_ddr_freq (ulong dummy)
144{
James Yanga3e77fa2008-02-08 18:05:08 -0600145 return gd->mem_clk;
Kumar Galad4357932007-12-07 04:59:26 -0600146}