2 * Copyright 2004 Freescale Semiconductor.
4 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
6 * (C) Copyright 2000-2002
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,
30 #include <asm/processor.h>
33 DECLARE_GLOBAL_DATA_PTR;
35 /* used in some defintiions of CONFIG_SYS_CLK_FREQ */
36 extern unsigned long get_board_sys_clk(unsigned long dummy);
38 void get_sys_info(sys_info_t *sysInfo)
40 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
41 volatile ccsr_gur_t *gur = &immap->im_gur;
42 uint plat_ratio, e600_ratio;
45 plat_ratio = (gur->porpllsr) & 0x0000003e;
50 sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ;
62 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
65 sysInfo->freqSystemBus = 0;
69 e600_ratio = (gur->porpllsr) & 0x003f0000;
74 sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus;
77 sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2;
80 sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus;
83 sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2;
86 sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus;
89 sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2;
92 sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus;
96 #if defined(CONFIG_SYS_LBC_LCRR)
97 /* We will program LCRR to this value later */
98 lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
100 lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV;
102 if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
103 sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2);
105 /* In case anyone cares what the unknown value is */
106 sysInfo->freqLocalBus = lcrr_div;
112 * Measure CPU clock speed (core clock GCLK1, GCLK2)
113 * (Approx. GCLK frequency in Hz)
120 get_sys_info(&sys_info);
121 gd->cpu_clk = sys_info.freqProcessor;
122 gd->bus_clk = sys_info.freqSystemBus;
123 gd->arch.lbc_clk = sys_info.freqLocalBus;
126 * The base clock for I2C depends on the actual SOC. Unfortunately,
127 * there is no pattern that can be used to determine the frequency, so
128 * the only choice is to look up the actual SOC number and use the value
129 * for that SOC. This information is taken from application note
132 #ifdef CONFIG_MPC8610
133 gd->arch.i2c1_clk = sys_info.freqSystemBus;
135 gd->arch.i2c1_clk = sys_info.freqSystemBus / 2;
137 gd->arch.i2c2_clk = gd->arch.i2c1_clk;
139 if (gd->cpu_clk != 0)
148 * Return system bus freq in Hz
151 ulong get_bus_freq(ulong dummy)
156 get_sys_info(&sys_info);
157 val = sys_info.freqSystemBus;