/*
 * (C) Copyright 2001
 * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * IBM 4XX DCR Functions
 */

#include <common.h>
#include <config.h>
#include <command.h>

#if defined(CONFIG_4xx) && (CONFIG_COMMANDS & CFG_CMD_SETGETDCR)

/* ======================================================================
 * Interpreter command to retrieve an IBM PPC 4xx Device Control Register
 * ======================================================================
 */
int do_getdcr ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] )
{
    unsigned short dcrn;                     /* Device Control Register Num */
    unsigned long value;                     /* DCR's value */

    unsigned long get_dcr(unsigned short);

    /* Validate arguments */
    if (argc < 2) {
	printf("Usage:\n%s\n", cmdtp->usage);
	return 1;
    }

    /* Get a DCR */
    dcrn = (unsigned short)simple_strtoul(argv[ 1 ], NULL, 16);
    value = get_dcr(dcrn);

    printf("%04x: %08lx\n", dcrn, value);

    return 0;
} /* do_getdcr */


/* ======================================================================
 * Interpreter command to set an IBM PPC 4xx Device Control Register
 * ======================================================================
*/
int do_setdcr ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
   unsigned long get_dcr(unsigned short );
   unsigned long set_dcr(unsigned short , unsigned long );
    unsigned short dcrn;                     /* Device Control Register Num */
   unsigned long value;
		    /* DCR's value */
    int nbytes;
    extern char console_buffer[];

    /* Validate arguments */
    if (argc < 2) {
	printf("Usage:\n%s\n", cmdtp->usage);
	return 1;
    }

    /* Set a DCR */
    dcrn = (unsigned short)simple_strtoul(argv[1], NULL, 16);
    do {
	value = get_dcr(dcrn);
	printf("%04x: %08lx", dcrn, value);
	nbytes = readline(" ? ");
	if (nbytes == 0) {
	    /*
	     * <CR> pressed as only input, don't modify current
	     * location and exit command.
	     */
	    nbytes = 1;
	    return 0;
	} else {
	    unsigned long i;
	    char *endp;
	    i = simple_strtoul(console_buffer, &endp, 16);
	    nbytes = endp - console_buffer;
	    if (nbytes)
		set_dcr(dcrn, i);
	}
    } while (nbytes);

    return 0;
} /* do_setdcr */

/***************************************************/

U_BOOT_CMD(
	getdcr,	2,	1,	do_getdcr,
	"getdcr  - Get an IBM PPC 4xx DCR's value\n",
	"dcrn - return a DCR's value.\n"
);
U_BOOT_CMD(
	setdcr,	2,	1,	do_setdcr,
	"setdcr  - Set an IBM PPC 4xx DCR's value\n",
	"dcrn - set a DCR's value.\n"
);

#endif /* CONFIG_4xx & CFG_CMD_SETGETDCR */