cmd_dcr.c
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/*
* (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 <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\n", 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 = 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\n", 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\n", 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."
);