common/cmd_dcr.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   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  * IBM 4XX DCR Functions
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <command.h>
  31
  32 #if defined(CONFIG_4xx) && (CONFIG_COMMANDS & CFG_CMD_SETGETDCR)
  33
  34 /* ======================================================================
  35  * Interpreter command to retrieve an IBM PPC 4xx Device Control Register
  36  * ======================================================================
  37  */
  38 int do_getdcr ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] )
  39 {
  40     unsigned short dcrn;                     /* Device Control Register Num */
  41     unsigned long value;                     /* DCR's value */
  42
  43     unsigned long get_dcr(unsigned short);
  44
  45     /* Validate arguments */
  46     if (argc < 2) {
  47         printf("Usage:\n%s\n", cmdtp->usage);
  48         return 1;
  49     }
  50
  51     /* Get a DCR */
  52     dcrn = (unsigned short)simple_strtoul(argv[ 1 ], NULL, 16);
  53     value = get_dcr(dcrn);
  54
  55     printf("%04x: %08lx\n", dcrn, value);
  56
  57     return 0;
  58 } /* do_getdcr */
  59
  60
  61 /* ======================================================================
  62  * Interpreter command to set an IBM PPC 4xx Device Control Register
  63  * ======================================================================
  64 */
  65 int do_setdcr ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  66 {
  67    unsigned long get_dcr(unsigned short );
  68    unsigned long set_dcr(unsigned short , unsigned long );
  69     unsigned short dcrn;                     /* Device Control Register Num */
  70    unsigned long value;
  71                     /* DCR's value */
  72     int nbytes;
  73     extern char console_buffer[];
  74
  75     /* Validate arguments */
  76     if (argc < 2) {
  77         printf("Usage:\n%s\n", cmdtp->usage);
  78         return 1;
  79     }
  80
  81     /* Set a DCR */
  82     dcrn = (unsigned short)simple_strtoul(argv[1], NULL, 16);
  83     do {
  84         value = get_dcr(dcrn);
  85         printf("%04x: %08lx", dcrn, value);
  86         nbytes = readline(" ? ");
  87         if (nbytes == 0) {
  88             /*
  89              * <CR> pressed as only input, don't modify current
  90              * location and exit command.
  91              */
  92             nbytes = 1;
  93             return 0;
  94         } else {
  95             unsigned long i;
  96             char *endp;
  97             i = simple_strtoul(console_buffer, &endp, 16);
  98             nbytes = endp - console_buffer;
  99             if (nbytes)
 100                 set_dcr(dcrn, i);
 101         }
 102     } while (nbytes);
 103
 104     return 0;
 105 } /* do_setdcr */
 106
 107 /***************************************************/
 108
 109 U_BOOT_CMD(
 110         getdcr, 2,      1,      do_getdcr,
 111         "getdcr  - Get an IBM PPC 4xx DCR's value\n",
 112         "dcrn - return a DCR's value.\n"
 113 );
 114 U_BOOT_CMD(
 115         setdcr, 2,      1,      do_setdcr,
 116         "setdcr  - Set an IBM PPC 4xx DCR's value\n",
 117         "dcrn - set a DCR's value.\n"
 118 );
 119
 120 #endif /* CONFIG_4xx & CFG_CMD_SETGETDCR */