cpu/mpc85xx/speed.c

   1 /*
   2  * Copyright 2004 Freescale Semiconductor.
   3  * (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
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 /* --------------------------------------------------------------- */
  35
  36 void get_sys_info (sys_info_t * sysInfo)
  37 {
  38         volatile ccsr_gur_t *gur = (void *)(CFG_MPC85xx_GUTS_ADDR);
  39         uint plat_ratio,e500_ratio,half_freqSystemBus;
  40
  41         plat_ratio = (gur->porpllsr) & 0x0000003e;
  42         plat_ratio >>= 1;
  43         sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
  44         e500_ratio = (gur->porpllsr) & 0x003f0000;
  45         e500_ratio >>= 16;
  46
  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;
  51         sysInfo->freqDDRBus = sysInfo->freqSystemBus;
  52
  53 #ifdef CONFIG_DDR_CLK_FREQ
  54         {
  55                 u32 ddr_ratio = ((gur->porpllsr) & 0x00003e00) >> 9;
  56                 if (ddr_ratio != 0x7)
  57                         sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
  58         }
  59 #endif
  60 }
  61
  62
  63 int get_clocks (void)
  64 {
  65         sys_info_t sys_info;
  66 #if defined(CONFIG_CPM2)
  67         volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CFG_MPC85xx_CPM_ADDR;
  68         uint sccr, dfbrg;
  69
  70         /* set VCO = 4 * BRG */
  71         cpm->im_cpm_intctl.sccr &= 0xfffffffc;
  72         sccr = cpm->im_cpm_intctl.sccr;
  73         dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
  74 #endif
  75         get_sys_info (&sys_info);
  76         gd->cpu_clk = sys_info.freqProcessor;
  77         gd->bus_clk = sys_info.freqSystemBus;
  78 #if defined(CONFIG_CPM2)
  79         gd->vco_out = 2*sys_info.freqSystemBus;
  80         gd->cpm_clk = gd->vco_out / 2;
  81         gd->scc_clk = gd->vco_out / 4;
  82         gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
  83 #endif
  84
  85         if(gd->cpu_clk != 0) return (0);
  86         else return (1);
  87 }
  88
  89
  90 /********************************************
  91  * get_bus_freq
  92  * return system bus freq in Hz
  93  *********************************************/
  94 ulong get_bus_freq (ulong dummy)
  95 {
  96         ulong val;
  97
  98         sys_info_t sys_info;
  99
 100         get_sys_info (&sys_info);
 101         val = sys_info.freqSystemBus;
 102
 103         return val;
 104 }
 105
 106 /********************************************
 107  * get_ddr_freq
 108  * return ddr bus freq in Hz
 109  *********************************************/
 110 ulong get_ddr_freq (ulong dummy)
 111 {
 112         ulong val;
 113
 114         sys_info_t sys_info;
 115
 116         get_sys_info (&sys_info);
 117         val = sys_info.freqDDRBus;
 118
 119         return val;
 120 }