package/uboot-lantiq/files/cpu/mips/danube/clock.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <asm/danube.h>
  26
  27 ulong ifx_get_ddr_hz(void)
  28 {
  29         static const ulong ddr_freq[] = {166666667,133333333,111111111,83333333};
  30         return ddr_freq[((*DANUBE_CGU_SYS) & 0x3)];
  31 }
  32
  33 ulong ifx_get_cpuclk(void)
  34 {
  35 #ifdef CONFIG_USE_EMULATOR
  36         return EMULATOR_CPU_SPEED;
  37 #else //NOT CONFIG_USE_EMULATOR
  38         unsigned int ddr_clock=ifx_get_ddr_hz();
  39         switch((*DANUBE_CGU_SYS) & 0xc){
  40                 case 0:
  41                 default:
  42                         return 323333333;
  43                 case 4:
  44                         return ddr_clock;
  45                 case 8:
  46                         return ddr_clock << 1;
  47         }
  48 #endif
  49 }
  50
  51 ulong get_bus_freq(ulong dummy)
  52 {
  53 #ifdef CONFIG_USE_EMULATOR
  54         unsigned int  clkCPU;
  55         clkCPU = ifx_get_cpuclk();
  56         return clkCPU >> 2;
  57 #else //NOT CONFIG_USE_EMULATOR
  58         unsigned int ddr_clock=ifx_get_ddr_hz();
  59         if ((*DANUBE_CGU_SYS) & 0x40){
  60                 return ddr_clock >> 1;
  61         }
  62         return ddr_clock;
  63 #endif
  64 }
  65