/* * Copyright (c) 2011 The Chromium OS Authors. * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <serial.h> #include <libfdt.h> #include <fdtdec.h> DECLARE_GLOBAL_DATA_PTR; /* * Here are the type we know about. One day we might allow drivers to * register. For now we just put them here. The COMPAT macro allows us to * turn this into a sparse list later, and keeps the ID with the name. */ #define COMPAT(id, name) name static const char * const compat_names[COMPAT_COUNT] = { }; /** * Look in the FDT for an alias with the given name and return its node. * * @param blob FDT blob * @param name alias name to look up * @return node offset if found, or an error code < 0 otherwise */ static int find_alias_node(const void *blob, const char *name) { const char *path; int alias_node; debug("find_alias_node: %s\n", name); alias_node = fdt_path_offset(blob, "/aliases"); if (alias_node < 0) return alias_node; path = fdt_getprop(blob, alias_node, name, NULL); if (!path) return -FDT_ERR_NOTFOUND; return fdt_path_offset(blob, path); } fdt_addr_t fdtdec_get_addr(const void *blob, int node, const char *prop_name) { const fdt_addr_t *cell; int len; debug("get_addr: %s\n", prop_name); cell = fdt_getprop(blob, node, prop_name, &len); if (cell && (len == sizeof(fdt_addr_t) || len == sizeof(fdt_addr_t) * 2)) return fdt_addr_to_cpu(*cell); return FDT_ADDR_T_NONE; } s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, s32 default_val) { const s32 *cell; int len; debug("get_size: %s\n", prop_name); cell = fdt_getprop(blob, node, prop_name, &len); if (cell && len >= sizeof(s32)) return fdt32_to_cpu(cell[0]); return default_val; } int fdtdec_get_is_enabled(const void *blob, int node, int default_val) { const char *cell; cell = fdt_getprop(blob, node, "status", NULL); if (cell) return 0 == strcmp(cell, "ok"); return default_val; } enum fdt_compat_id fd_dec_lookup(const void *blob, int node) { enum fdt_compat_id id; /* Search our drivers */ for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) if (0 == fdt_node_check_compatible(blob, node, compat_names[id])) return id; return COMPAT_UNKNOWN; } int fdtdec_next_compatible(const void *blob, int node, enum fdt_compat_id id) { return fdt_node_offset_by_compatible(blob, node, compat_names[id]); } int fdtdec_next_alias(const void *blob, const char *name, enum fdt_compat_id id, int *upto) { #define MAX_STR_LEN 20 char str[MAX_STR_LEN + 20]; int node, err; /* snprintf() is not available */ assert(strlen(name) < MAX_STR_LEN); sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); (*upto)++; node = find_alias_node(blob, str); if (node < 0) return node; err = fdt_node_check_compatible(blob, node, compat_names[id]); if (err < 0) return err; return err ? -FDT_ERR_NOTFOUND : node; } /* * This function is a little odd in that it accesses global data. At some * point if the architecture board.c files merge this will make more sense. * Even now, it is common code. */ int fdtdec_check_fdt(void) { /* We must have an fdt */ if (fdt_check_header(gd->fdt_blob)) panic("No valid fdt found - please append one to U-Boot\n" "binary or define CONFIG_OF_EMBED\n"); return 0; }