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 /* --------------------------------------------------------------- */
  33
  34 void get_sys_info (sys_info_t * sysInfo)
  35 {
  36         volatile immap_t    *immap = (immap_t *)CFG_IMMR;
  37         volatile ccsr_gur_t *gur = &immap->im_gur;
  38         uint plat_ratio,e500_ratio;
  39
  40         plat_ratio = (gur->porpllsr) & 0x0000003e;
  41         plat_ratio >>= 1;
  42         switch(plat_ratio) {
  43         case 0x02:
  44         case 0x03:
  45         case 0x04:
  46         case 0x05:
  47         case 0x06:
  48         case 0x08:
  49         case 0x09:
  50         case 0x0a:
  51         case 0x0c:
  52         case 0x10:
  53                 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
  54                 break;
  55         default:
  56                 sysInfo->freqSystemBus = 0;
  57                 break;
  58         }
  59
  60         e500_ratio = (gur->porpllsr) & 0x003f0000;
  61         e500_ratio >>= 16;
  62         switch(e500_ratio) {
  63         case 0x04:
  64                 sysInfo->freqProcessor = 2*sysInfo->freqSystemBus;
  65                 break;
  66         case 0x05:
  67                 sysInfo->freqProcessor = 5*sysInfo->freqSystemBus/2;
  68                 break;
  69         case 0x06:
  70                 sysInfo->freqProcessor = 3*sysInfo->freqSystemBus;
  71                 break;
  72         case 0x07:
  73                 sysInfo->freqProcessor = 7*sysInfo->freqSystemBus/2;
  74                 break;
  75         default:
  76                 sysInfo->freqProcessor = 0;
  77                 break;
  78         }
  79 }
  80
  81 int get_clocks (void)
  82 {
  83         DECLARE_GLOBAL_DATA_PTR;
  84         sys_info_t sys_info;
  85 #if defined(CONFIG_CPM2)
  86         volatile immap_t *immap = (immap_t *) CFG_IMMR;
  87         uint sccr, dfbrg;
  88
  89         /* set VCO = 4 * BRG */
  90         immap->im_cpm.im_cpm_intctl.sccr &= 0xfffffffc;
  91         sccr = immap->im_cpm.im_cpm_intctl.sccr;
  92         dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
  93 #endif
  94         get_sys_info (&sys_info);
  95         gd->cpu_clk = sys_info.freqProcessor;
  96         gd->bus_clk = sys_info.freqSystemBus;
  97 #if defined(CONFIG_CPM2)
  98         gd->vco_out = 2*sys_info.freqSystemBus;
  99         gd->cpm_clk = gd->vco_out / 2;
 100         gd->scc_clk = gd->vco_out / 4;
 101         gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
 102 #endif
 103
 104         if(gd->cpu_clk != 0) return (0);
 105         else return (1);
 106 }
 107
 108
 109 /********************************************
 110  * get_bus_freq
 111  * return system bus freq in Hz
 112  *********************************************/
 113 ulong get_bus_freq (ulong dummy)
 114 {
 115         ulong val;
 116
 117         sys_info_t sys_info;
 118
 119         get_sys_info (&sys_info);
 120         val = sys_info.freqSystemBus;
 121
 122         return val;
 123 }