arch/m68k/cpu/mcf523x/cpu.c

   1 /*
   2  *
   3  * (C) Copyright 2000-2003
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   7  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   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 <watchdog.h>
  30 #include <command.h>
  31 #include <netdev.h>
  32
  33 #include <asm/immap.h>
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  38 {
  39         volatile ccm_t *ccm = (ccm_t *) MMAP_CCM;
  40
  41         ccm->rcr = CCM_RCR_SOFTRST;
  42         /* we don't return! */
  43         return 0;
  44 };
  45
  46 int checkcpu(void)
  47 {
  48         volatile ccm_t *ccm = (ccm_t *) MMAP_CCM;
  49         u16 msk;
  50         u16 id = 0;
  51         u8 ver;
  52
  53         puts("CPU:   ");
  54         msk = (ccm->cir >> 6);
  55         ver = (ccm->cir & 0x003f);
  56         switch (msk) {
  57         case 0x31:
  58                 id = 5235;
  59                 break;
  60         }
  61
  62         if (id) {
  63                 char buf1[32], buf2[32];
  64
  65                 printf("Freescale MCF%d (Mask:%01x Version:%x)\n", id, msk,
  66                        ver);
  67                 printf("       CPU CLK %s MHz BUS CLK %s MHz\n",
  68                        strmhz(buf1, gd->cpu_clk),
  69                        strmhz(buf2, gd->bus_clk));
  70         }
  71
  72         return 0;
  73 };
  74
  75 #if defined(CONFIG_WATCHDOG)
  76 /* Called by macro WATCHDOG_RESET */
  77 void watchdog_reset(void)
  78 {
  79         volatile wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
  80
  81         wdp->sr = 0x5555;       /* Count register */
  82         asm("nop");
  83         wdp->sr = 0xAAAA;       /* Count register */
  84 }
  85
  86 int watchdog_disable(void)
  87 {
  88         volatile wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
  89
  90         /* UserManual, once the wdog is disabled, wdog cannot be re-enabled */
  91         wdp->cr |= WTM_WCR_HALTED;      /* halted watchdog timer */
  92
  93         puts("WATCHDOG:disabled\n");
  94         return (0);
  95 }
  96
  97 int watchdog_init(void)
  98 {
  99         volatile wdog_t *wdp = (wdog_t *) (MMAP_WDOG);
 100         u32 wdog_module = 0;
 101
 102         /* set timeout and enable watchdog */
 103         wdog_module = ((CONFIG_SYS_CLK / CONFIG_SYS_HZ) * CONFIG_WATCHDOG_TIMEOUT);
 104         wdog_module |= (wdog_module / 8192);
 105         wdp->mr = wdog_module;
 106
 107         wdp->cr = WTM_WCR_EN;
 108         puts("WATCHDOG:enabled\n");
 109
 110         return (0);
 111 }
 112 #endif                          /* CONFIG_WATCHDOG */
 113
 114 #if defined(CONFIG_MCFFEC)
 115 /* Default initializations for MCFFEC controllers.  To override,
 116  * create a board-specific function called:
 117  *      int board_eth_init(bd_t *bis)
 118  */
 119
 120 int cpu_eth_init(bd_t *bis)
 121 {
 122         return mcffec_initialize(bis);
 123 }
 124 #endif