fdt: Add get commands to fdt
Add commands to access data in the fdt. This allows data from a dtb or itb to be accessed from the shell scripts. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger
Gerald Van Baren
parent
f0a29d4331
commit
bc80295b62
144
common/cmd_fdt.c
144
common/cmd_fdt.c
@ -47,6 +47,7 @@ DECLARE_GLOBAL_DATA_PTR;
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static int fdt_valid(void);
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static int fdt_parse_prop(char *const*newval, int count, char *data, int *len);
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static int fdt_print(const char *pathp, char *prop, int depth);
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static int is_printable_string(const void *data, int len);
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/*
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* The working_fdt points to our working flattened device tree.
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@ -63,6 +64,34 @@ void set_working_fdt_addr(void *addr)
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setenv("fdtaddr", buf);
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}
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/*
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* Get a value from the fdt and format it to be set in the environment
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*/
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static int fdt_value_setenv(const void *nodep, int len, const char *var)
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{
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if (is_printable_string(nodep, len))
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setenv(var, (void *)nodep);
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else if (len == 4) {
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char buf[11];
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sprintf(buf, "0x%08X", *(uint32_t *)nodep);
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setenv(var, buf);
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} else if (len%4 == 0 && len <= 20) {
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/* Needed to print things like sha1 hashes. */
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char buf[41];
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int i;
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for (i = 0; i < len; i += sizeof(unsigned int))
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sprintf(buf + (i * 2), "%08x",
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*(unsigned int *)(nodep + i));
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setenv(var, buf);
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} else {
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printf("error: unprintable value\n");
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return 1;
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}
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return 0;
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}
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/*
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* Flattened Device Tree command, see the help for parameter definitions.
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*/
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@ -253,6 +282,117 @@ int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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return 1;
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}
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/********************************************************************
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* Get the value of a property in the working_fdt.
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********************************************************************/
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} else if (argv[1][0] == 'g') {
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char *subcmd; /* sub-command */
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char *pathp; /* path */
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char *prop; /* property */
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char *var; /* variable to store result */
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int nodeoffset; /* node offset from libfdt */
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const void *nodep; /* property node pointer */
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int len = 0; /* new length of the property */
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/*
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* Parameters: Node path, property, optional value.
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*/
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if (argc < 5)
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return CMD_RET_USAGE;
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subcmd = argv[2];
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if (argc < 6 && subcmd[0] != 's')
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return CMD_RET_USAGE;
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var = argv[3];
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pathp = argv[4];
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prop = argv[5];
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nodeoffset = fdt_path_offset(working_fdt, pathp);
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if (nodeoffset < 0) {
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/*
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* Not found or something else bad happened.
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*/
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printf("libfdt fdt_path_offset() returned %s\n",
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fdt_strerror(nodeoffset));
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return 1;
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}
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if (subcmd[0] == 'n' || (subcmd[0] == 's' && argc == 5)) {
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int reqIndex = -1;
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int startDepth = fdt_node_depth(
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working_fdt, nodeoffset);
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int curDepth = startDepth;
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int curIndex = -1;
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int nextNodeOffset = fdt_next_node(
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working_fdt, nodeoffset, &curDepth);
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if (subcmd[0] == 'n')
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reqIndex = simple_strtoul(argv[5], NULL, 16);
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while (curDepth > startDepth) {
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if (curDepth == startDepth + 1)
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curIndex++;
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if (subcmd[0] == 'n' && curIndex == reqIndex) {
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const char *nodeName = fdt_get_name(
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working_fdt, nextNodeOffset, NULL);
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setenv(var, (char *)nodeName);
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return 0;
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}
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nextNodeOffset = fdt_next_node(
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working_fdt, nextNodeOffset, &curDepth);
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if (nextNodeOffset < 0)
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break;
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}
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if (subcmd[0] == 's') {
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/* get the num nodes at this level */
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char buf[11];
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sprintf(buf, "%d", curIndex + 1);
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setenv(var, buf);
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} else {
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/* node index not found */
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printf("libfdt node not found\n");
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return 1;
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}
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} else {
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nodep = fdt_getprop(
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working_fdt, nodeoffset, prop, &len);
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if (len == 0) {
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/* no property value */
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setenv(var, "");
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return 0;
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} else if (len > 0) {
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if (subcmd[0] == 'v') {
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int ret;
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ret = fdt_value_setenv(nodep, len, var);
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if (ret != 0)
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return ret;
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} else if (subcmd[0] == 'a') {
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/* Get address */
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char buf[11];
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sprintf(buf, "0x%08X", (uint32_t)nodep);
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setenv(var, buf);
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} else if (subcmd[0] == 's') {
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/* Get size */
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char buf[11];
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sprintf(buf, "0x%08X", len);
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setenv(var, buf);
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} else
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return CMD_RET_USAGE;
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return 0;
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} else {
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printf("libfdt fdt_getprop(): %s\n",
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fdt_strerror(len));
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return 1;
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}
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}
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/*
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* Print (recursive) / List (single level)
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*/
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@ -836,6 +976,10 @@ U_BOOT_CMD(
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"fdt resize - Resize fdt to size + padding to 4k addr\n"
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"fdt print <path> [<prop>] - Recursive print starting at <path>\n"
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"fdt list <path> [<prop>] - Print one level starting at <path>\n"
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"fdt get value <var> <path> <prop> - Get <property> and store in <var>\n"
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"fdt get name <var> <path> <index> - Get name of node <index> and store in <var>\n"
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"fdt get addr <var> <path> <prop> - Get start address of <property> and store in <var>\n"
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"fdt get size <var> <path> [<prop>] - Get size of [<property>] or num nodes and store in <var>\n"
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"fdt set <path> <prop> [<val>] - Set <property> [to <val>]\n"
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"fdt mknode <path> <node> - Create a new node after <path>\n"
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"fdt rm <path> [<prop>] - Delete the node or <property>\n"
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