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>
33 DECLARE_GLOBAL_DATA_PTR;
35 /* --------------------------------------------------------------- */
37 void get_sys_info (sys_info_t * sysInfo)
39 volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
40 uint plat_ratio,e500_ratio,half_freqSystemBus;
43 plat_ratio = (gur->porpllsr) & 0x0000003e;
45 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
46 e500_ratio = (gur->porpllsr) & 0x003f0000;
49 /* Divide before multiply to avoid integer
50 * overflow for processor speeds above 2GHz */
51 half_freqSystemBus = sysInfo->freqSystemBus/2;
52 sysInfo->freqProcessor = e500_ratio*half_freqSystemBus;
54 /* Note: freqDDRBus is the MCLK frequency, not the data rate. */
55 sysInfo->freqDDRBus = sysInfo->freqSystemBus;
57 #ifdef CONFIG_DDR_CLK_FREQ
59 u32 ddr_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO)
60 >> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
62 sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
66 #if defined(CONFIG_SYS_LBC_LCRR)
67 /* We will program LCRR to this value later */
68 lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
71 volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
72 lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
75 if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
76 #if !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && \
77 !defined(CONFIG_MPC8555) && !defined(CONFIG_MPC8560)
79 * Yes, the entire PQ38 family use the same
80 * bit-representation for twice the clock divider values.
84 sysInfo->freqLocalBus = sysInfo->freqSystemBus / lcrr_div;
86 /* In case anyone cares what the unknown value is */
87 sysInfo->freqLocalBus = lcrr_div;
96 volatile ccsr_gur_t *gur = (void *) CONFIG_SYS_MPC85xx_GUTS_ADDR;
98 #if defined(CONFIG_CPM2)
99 volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
102 /* set VCO = 4 * BRG */
103 cpm->im_cpm_intctl.sccr &= 0xfffffffc;
104 sccr = cpm->im_cpm_intctl.sccr;
105 dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
107 get_sys_info (&sys_info);
108 gd->cpu_clk = sys_info.freqProcessor;
109 gd->bus_clk = sys_info.freqSystemBus;
110 gd->mem_clk = sys_info.freqDDRBus;
111 gd->lbc_clk = sys_info.freqLocalBus;
114 * The base clock for I2C depends on the actual SOC. Unfortunately,
115 * there is no pattern that can be used to determine the frequency, so
116 * the only choice is to look up the actual SOC number and use the value
117 * for that SOC. This information is taken from application note
120 #if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
121 defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
122 gd->i2c1_clk = sys_info.freqSystemBus;
123 #elif defined(CONFIG_MPC8544)
125 * On the 8544, the I2C clock is the same as the SEC clock. This can be
126 * either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See
127 * 4.4.3.3 of the 8544 RM. Note that this might actually work for all
128 * 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the
129 * PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544.
131 if (gur->pordevsr2 & MPC85xx_PORDEVSR2_SEC_CFG)
132 gd->i2c1_clk = sys_info.freqSystemBus / 3;
134 gd->i2c1_clk = sys_info.freqSystemBus / 2;
136 /* Most 85xx SOCs use CCB/2, so this is the default behavior. */
137 gd->i2c1_clk = sys_info.freqSystemBus / 2;
139 gd->i2c2_clk = gd->i2c1_clk;
141 #if defined(CONFIG_MPC8536)
142 gd->sdhc_clk = gd->bus_clk / 2;
145 #if defined(CONFIG_CPM2)
146 gd->vco_out = 2*sys_info.freqSystemBus;
147 gd->cpm_clk = gd->vco_out / 2;
148 gd->scc_clk = gd->vco_out / 4;
149 gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
152 if(gd->cpu_clk != 0) return (0);
157 /********************************************
159 * return system bus freq in Hz
160 *********************************************/
161 ulong get_bus_freq (ulong dummy)
166 /********************************************
168 * return ddr bus freq in Hz
169 *********************************************/
170 ulong get_ddr_freq (ulong dummy)