cpu/mpc8220/cpu.c

   1 /*
   2  * (C) Copyright 2000-2003
   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 /*
  25  * CPU specific code for the MPC8220 CPUs
  26  */
  27
  28 #include <common.h>
  29 #include <watchdog.h>
  30 #include <command.h>
  31 #include <mpc8220.h>
  32 #include <asm/processor.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 int checkcpu (void)
  37 {
  38         ulong clock = gd->cpu_clk;
  39         char buf[32];
  40
  41         puts ("CPU:   ");
  42
  43         printf (CPU_ID_STR);
  44
  45         printf (" (JTAG ID %08lx)", *(vu_long *) (CFG_MBAR + 0x50));
  46
  47         printf (" at %s MHz\n", strmhz (buf, clock));
  48
  49         return 0;
  50 }
  51
  52 /* ------------------------------------------------------------------------- */
  53
  54 int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  55 {
  56         volatile gptmr8220_t *gptmr = (volatile gptmr8220_t *) MMAP_GPTMR;
  57         ulong msr;
  58
  59         /* Interrupts and MMU off */
  60         __asm__ __volatile__ ("mfmsr    %0":"=r" (msr):);
  61
  62         msr &= ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR);
  63         __asm__ __volatile__ ("mtmsr    %0"::"r" (msr));
  64
  65         /* Charge the watchdog timer */
  66         gptmr->Prescl = 10;
  67         gptmr->Count = 1;
  68
  69         gptmr->Mode = GPT_TMS_SGPIO;
  70
  71         gptmr->Control = GPT_CTRL_WDEN | GPT_CTRL_CE;
  72
  73         return 1;
  74 }
  75
  76 /* ------------------------------------------------------------------------- */
  77
  78 /*
  79  * Get timebase clock frequency (like cpu_clk in Hz)
  80  *
  81  */
  82 unsigned long get_tbclk (void)
  83 {
  84         ulong tbclk;
  85
  86         tbclk = (gd->bus_clk + 3L) / 4L;
  87
  88         return (tbclk);
  89 }
  90
  91 /* ------------------------------------------------------------------------- */