152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
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* oftree.c - device tree command support
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*
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* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* based on U-Boot code by:
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*
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
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* Pantelis Antoniou <pantelis.antoniou@gmail.com> and
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* Matthew McClintock <msm@freescale.com>
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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 modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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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*/
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#include <common.h>
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#include <environment.h>
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#include <fdt.h>
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#include <of.h>
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#include <command.h>
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#include <fs.h>
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#include <malloc.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <asm/byteorder.h>
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#include <errno.h>
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#include <getopt.h>
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#include <init.h>
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#include <fcntl.h>
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#include <complete.h>
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static int do_oftree(int argc, char *argv[])
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{
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struct fdt_header *fdt = NULL;
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int size;
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int opt;
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int probe = 0;
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char *load = NULL;
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char *save = NULL;
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int free_of = 0;
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int ret;
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struct device_node *root;
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while ((opt = getopt(argc, argv, "pfl:s:")) > 0) {
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switch (opt) {
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case 'l':
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load = optarg;
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break;
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case 'p':
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if (IS_ENABLED(CONFIG_OFDEVICE)) {
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probe = 1;
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} else {
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printf("oftree device probe support disabled\n");
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return COMMAND_ERROR_USAGE;
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}
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break;
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case 'f':
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free_of = 1;
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break;
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case 's':
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save = optarg;
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break;
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}
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}
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if (free_of) {
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struct device_node *root = of_get_root_node();
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if (root)
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of_delete_node(root);
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if (!load)
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return 0;
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}
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if (!probe && !load && !save)
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return COMMAND_ERROR_USAGE;
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if (save) {
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fdt = of_get_fixed_tree(NULL);
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if (!fdt) {
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printf("no devicetree available\n");
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ret = -EINVAL;
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goto out;
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}
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ret = write_file(save, fdt, fdt32_to_cpu(fdt->totalsize));
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goto out;
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}
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if (load) {
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fdt = read_file(load, &size);
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if (!fdt) {
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printf("unable to read %s\n", load);
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return 1;
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}
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root = of_unflatten_dtb(fdt);
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free(fdt);
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if (IS_ERR(root))
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return PTR_ERR(root);
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ret = of_set_root_node(root);
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if (ret) {
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printf("setting root node failed: %s\n", strerror(-ret));
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of_delete_node(root);
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goto out;
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}
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}
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if (probe) {
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ret = of_probe();
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if (ret)
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goto out;
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}
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ret = 0;
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out:
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return ret;
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}
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BAREBOX_CMD_HELP_START(oftree)
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BAREBOX_CMD_HELP_TEXT("Options:")
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BAREBOX_CMD_HELP_OPT ("-l <DTB>", "Load <DTB> to internal devicetree\n")
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BAREBOX_CMD_HELP_OPT ("-s <DTB>", "save internal devicetree to <DTB>\n")
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BAREBOX_CMD_HELP_OPT ("-p", "probe devices from stored device tree")
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BAREBOX_CMD_HELP_OPT ("-f", "free stored device tree")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(oftree)
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.cmd = do_oftree,
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BAREBOX_CMD_DESC("handle device trees")
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BAREBOX_CMD_OPTS("[-lpfs]")
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BAREBOX_CMD_GROUP(CMD_GRP_MISC)
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BAREBOX_CMD_HELP(cmd_oftree_help)
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BAREBOX_CMD_END
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