target/linux/ifxmips/image/u-boot/files/cpu/mips/danube/ifx_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-mips/danube.h>
  26
  27
  28
  29 /*******************************************************************************
  30 *
  31 * get_cpuclk - returns the frequency of the CPU.
  32 *
  33 * NOTE:
  34 *   This functions should be used by the hardware driver to get the correct
  35 *   frequency of the CPU.
  36 */
  37
  38 unsigned int danube_get_ddr_hz(void)
  39 {
  40         switch((*DANUBE_CGU_SYS) & 0x3){
  41                 case 0:
  42                         return 166666667;
  43                 case 1:
  44                         return 133333333;
  45                 case 2:
  46                         return 111111111;
  47                 case 3:
  48                         return 83333333;
  49         }
  50 }
  51
  52
  53 uint danube_get_cpuclk(void)
  54 {
  55 #ifdef CONFIG_USE_EMULATOR
  56         return EMULATOR_CPU_SPEED;
  57 #else //NOT CONFIG_USE_EMULATOR
  58         unsigned int ddr_clock=danube_get_ddr_hz();
  59         switch((*DANUBE_CGU_SYS) & 0xc){
  60                 case 0:
  61                         return 333333333;
  62                 case 4:
  63                         return ddr_clock;
  64                 case 8:
  65                         return ddr_clock << 1;
  66                 default:
  67                         break;
  68                         /*reserved*/
  69         }
  70 #endif
  71
  72 }
  73
  74
  75 uint danube_get_fpiclk(void)
  76 {
  77 #ifdef CONFIG_USE_EMULATOR
  78         unsigned int  clkCPU;
  79         clkCPU = danube_get_cpu_hz();
  80         return clkCPU >> 2;
  81 #else //NOT CONFIG_USE_EMULATOR
  82         unsigned int ddr_clock=danube_get_ddr_hz();
  83         if ((*DANUBE_CGU_SYS) & 0x40){
  84                 return ddr_clock >> 1;
  85         }
  86         return ddr_clock;
  87 #endif
  88
  89 }
  90
  91