/*
   * (C) Copyright 2001
   * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * AMCC 4XX DCR Functions
   */
  
  #include <common.h>
  #include <cli.h>
  #include <config.h>
  #include <command.h>
  
  unsigned long get_dcr (unsigned short);
  unsigned long set_dcr (unsigned short, unsigned long);
  
  /* =======================================================================
   * Interpreter command to retrieve an AMCC PPC 4xx Device Control Register
   * =======================================================================
   */
  int do_getdcr ( cmd_tbl_t *cmdtp, int flag, int argc, char * const 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)
  		return CMD_RET_USAGE;
  
  	/* Get a DCR */
  	dcrn = (unsigned short) simple_strtoul (argv[1], NULL, 16);
  	value = get_dcr (dcrn);
  
  	printf ("%04x: %08lx
  ", dcrn, value);
  
  	return 0;
  }
  
  
  /* ======================================================================
   * Interpreter command to set an AMCC PPC 4xx Device Control Register
   * ======================================================================
  */
  int do_setdcr (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  {
  	unsigned short dcrn;	/* Device Control Register Num */
  	unsigned long value;
  
  	/* DCR's value */
  	int nbytes;
  
  	/* Validate arguments */
  	if (argc < 2)
  		return CMD_RET_USAGE;
  
  	/* Set a DCR */
  	dcrn = (unsigned short) simple_strtoul (argv[1], NULL, 16);
  	do {
  		value = get_dcr (dcrn);
  		printf ("%04x: %08lx", dcrn, value);
  		nbytes = cli_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;
  }
  
  /* =======================================================================
   * Interpreter command to retrieve an register value through AMCC PPC 4xx
   * Device Control Register inderect addressing.
   * =======================================================================
   */
  int do_getidcr (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  {
  	unsigned short adr_dcrn;	/* Device Control Register Num for Address */
  	unsigned short dat_dcrn;	/* Device Control Register Num for Data */
  	unsigned short offset;		/* Register's offset */
  	unsigned long value;		/* Register's value */
  	char *ptr = NULL;
  	char buf[80];
  
  	/* Validate arguments */
  	if (argc < 3)
  		return CMD_RET_USAGE;
  
  	/* Find out whether ther is '.' (dot) symbol in the first parameter. */
  	strncpy (buf, argv[1], sizeof(buf)-1);
  	buf[sizeof(buf)-1] = 0; /* will guarantee zero-end string */
  	ptr = strchr (buf, '.');
  
  	if (ptr != NULL) {
  		/* First parameter has format adr_dcrn.dat_dcrn */
  		*ptr++ = 0; /* erase '.', create zero-end string */
  		adr_dcrn = (unsigned short) simple_strtoul (buf, NULL, 16);
  		dat_dcrn = (unsigned short) simple_strtoul (ptr, NULL, 16);
  	} else {
  		/*
  		 * First parameter has format adr_dcrn; dat_dcrn will be
  		 * calculated as adr_dcrn+1.
  		 */
  		adr_dcrn = (unsigned short) simple_strtoul (buf, NULL, 16);
  		dat_dcrn = adr_dcrn+1;
  	}
  
  	/* Register's offset */
  	offset = (unsigned short) simple_strtoul (argv[2], NULL, 16);
  
  	/* Disable interrupts */
  	disable_interrupts ();
  	/* Set offset */
  	set_dcr (adr_dcrn, offset);
  	/* get data */
  	value = get_dcr (dat_dcrn);
  	/* Enable interrupts */
  	enable_interrupts ();
  
  	printf ("%04x.%04x-%04x Read  %08lx
  ", adr_dcrn, dat_dcrn, offset, value);
  
  	return 0;
  }
  
  /* =======================================================================
   * Interpreter command to update an register value through AMCC PPC 4xx
   * Device Control Register inderect addressing.
   * =======================================================================
   */
  int do_setidcr (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  {
  	unsigned short adr_dcrn;	/* Device Control Register Num for Address */
  	unsigned short dat_dcrn;	/* Device Control Register Num for Data */
  	unsigned short offset;		/* Register's offset */
  	unsigned long value;		/* Register's value */
  	char *ptr = NULL;
  	char buf[80];
  
  	/* Validate arguments */
  	if (argc < 4)
  		return CMD_RET_USAGE;
  
  	/* Find out whether ther is '.' (dot) symbol in the first parameter. */
  	strncpy (buf, argv[1], sizeof(buf)-1);
  	buf[sizeof(buf)-1] = 0; /* will guarantee zero-end string */
  	ptr = strchr (buf, '.');
  
  	if (ptr != NULL) {
  		/* First parameter has format adr_dcrn.dat_dcrn */
  		*ptr++ = 0;	/* erase '.', create zero-end string */
  		adr_dcrn = (unsigned short) simple_strtoul (buf, NULL, 16);
  		dat_dcrn = (unsigned short) simple_strtoul (ptr, NULL, 16);
  	} else {
  		/*
  		 * First parameter has format adr_dcrn; dat_dcrn will be
  		 * calculated as adr_dcrn+1.
  		 */
  		adr_dcrn = (unsigned short) simple_strtoul (buf, NULL, 16);
  		dat_dcrn = adr_dcrn+1;
  	}
  
  	/* Register's offset */
  	offset = (unsigned short) simple_strtoul (argv[2], NULL, 16);
  	/* New value */
  	value  = (unsigned  long) simple_strtoul (argv[3], NULL, 16);
  
  	/* Disable interrupts */
  	disable_interrupts ();
  	/* Set offset */
  	set_dcr (adr_dcrn, offset);
  	/* set data */
  	set_dcr (dat_dcrn, value);
  	/* Enable interrupts */
  	enable_interrupts ();
  
  	printf ("%04x.%04x-%04x Write %08lx
  ", adr_dcrn, dat_dcrn, offset, value);
  
  	return 0;
  }
  
  /***************************************************/
  
  U_BOOT_CMD(
  	getdcr,	2,	1,	do_getdcr,
  	"Get an AMCC PPC 4xx DCR's value",
  	"dcrn - return a DCR's value."
  );
  U_BOOT_CMD(
  	setdcr,	2,	1,	do_setdcr,
  	"Set an AMCC PPC 4xx DCR's value",
  	"dcrn - set a DCR's value."
  );
  
  U_BOOT_CMD(
  	getidcr,	3,	1,	do_getidcr,
  	"Get a register value via indirect DCR addressing",
  	"adr_dcrn[.dat_dcrn] offset - write offset to adr_dcrn, read value from dat_dcrn."
  );
  
  U_BOOT_CMD(
  	setidcr,	4,	1,	do_setidcr,
  	"Set a register value via indirect DCR addressing",
  	"adr_dcrn[.dat_dcrn] offset value - write offset to adr_dcrn, write value to dat_dcrn."
  );