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![Gary Jennejohn](/assets/img/avatar_default.png)
Modifications to support console multiplexing. This is controlled using CONFIG_SYS_CONSOLE_MUX in the board configuration file. This allows a user to specify multiple console devices in the environment with a command like this: setenv stdin serial,nc. As a result, the user can enter text on both the serial and netconsole interfaces. All devices - stdin, stdout and stderr - can be set in this manner. 1) common/iomux.c and include/iomux.h contain the environment setting implementation. 2) doc/README.iomux contains a somewhat more detailed description. 3) The implementation in (1) is called from common/cmd_nvedit.c to handle setenv and from common/console.c to handle initialization of input/output devices at boot time. 4) common/console.c also contains the code needed to poll multiple console devices for input and send output to all devices registered for output. 5) include/common.h includes iomux.h and common/Makefile generates iomux.o when CONFIG_SYS_CONSOLE_MUX is set. Signed-off-by: Gary Jennejohn <garyj@denx.de>
176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/*
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* (C) Copyright 2008
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* Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <serial.h>
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#include <malloc.h>
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#ifdef CONFIG_CONSOLE_MUX
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void iomux_printdevs(const int console)
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{
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int i;
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device_t *dev;
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for (i = 0; i < cd_count[console]; i++) {
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dev = console_devices[console][i];
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printf("%s ", dev->name);
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}
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printf("\n");
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}
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/* This tries to preserve the old list if an error occurs. */
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int iomux_doenv(const int console, const char *arg)
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{
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char *console_args, *temp, **start;
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int i, j, k, io_flag, cs_idx, repeat;
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device_t *dev;
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device_t **cons_set;
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console_args = strdup(arg);
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if (console_args == NULL)
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return 1;
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/*
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* Check whether a comma separated list of devices was
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* entered and count how many devices were entered.
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* The array start[] has pointers to the beginning of
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* each device name (up to MAX_CONSARGS devices).
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*
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* Have to do this twice - once to count the number of
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* commas and then again to populate start.
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*/
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i = 0;
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temp = console_args;
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for (;;) {
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temp = strchr(temp, ',');
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if (temp != NULL) {
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i++;
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temp++;
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continue;
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}
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/* There's always one entry more than the number of commas. */
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i++;
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break;
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}
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start = (char **)malloc(i * sizeof(char *));
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if (start == NULL) {
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free(console_args);
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return 1;
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}
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i = 0;
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start[0] = console_args;
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for (;;) {
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temp = strchr(start[i++], ',');
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if (temp == NULL)
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break;
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*temp = '\0';
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start[i] = temp + 1;
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}
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cons_set = (device_t **)calloc(i, sizeof(device_t *));
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if (cons_set == NULL) {
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free(start);
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free(console_args);
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return 1;
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}
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switch (console) {
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case stdin:
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io_flag = DEV_FLAGS_INPUT;
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break;
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case stdout:
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case stderr:
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io_flag = DEV_FLAGS_OUTPUT;
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break;
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default:
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free(start);
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free(console_args);
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free(cons_set);
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return 1;
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}
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cs_idx = 0;
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for (j = 0; j < i; j++) {
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/*
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* Check whether the device exists and is valid.
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* console_assign() also calls search_device(),
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* but I need the pointer to the device.
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*/
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dev = search_device(io_flag, start[j]);
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if (dev == NULL)
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continue;
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/*
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* Prevent multiple entries for a device.
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*/
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repeat = 0;
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for (k = 0; k < cs_idx; k++) {
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if (dev == cons_set[k]) {
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repeat++;
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break;
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}
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}
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if (repeat)
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continue;
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/*
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* Try assigning the specified device.
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* This could screw up the console settings for apps.
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*/
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if (console_assign(console, start[j]) < 0)
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continue;
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#ifdef CONFIG_SERIAL_MULTI
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/*
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* This was taken from common/cmd_nvedit.c.
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* This will never work because serial_assign() returns
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* 1 upon error, not -1.
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* This would almost always return an error anyway because
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* serial_assign() expects the name of a serial device, like
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* serial_smc, but the user generally only wants to set serial.
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*/
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if (serial_assign(start[j]) < 0)
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continue;
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#endif
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cons_set[cs_idx++] = dev;
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}
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free(console_args);
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free(start);
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/* failed to set any console */
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if (cs_idx == 0) {
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free(cons_set);
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return 1;
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} else {
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/* Works even if console_devices[console] is NULL. */
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console_devices[console] =
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(device_t **)realloc(console_devices[console],
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cs_idx * sizeof(device_t *));
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if (console_devices[console] == NULL) {
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free(cons_set);
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return 1;
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}
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memcpy(console_devices[console], cons_set, cs_idx *
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sizeof(device_t *));
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cd_count[console] = cs_idx;
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}
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free(cons_set);
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return 0;
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}
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#endif /* CONFIG_CONSOLE_MUX */
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