| /* |
| * 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] = { |
| }; |
| |
| const char *fdtdec_get_compatible(enum fdt_compat_id id) |
| { |
| /* We allow reading of the 'unknown' ID for testing purposes */ |
| assert(id >= 0 && id < COMPAT_COUNT); |
| return compat_names[id]; |
| } |
| |
| /** |
| * 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; |
| } |
| |
| /* TODO: Can we tighten this code up a little? */ |
| int fdtdec_find_aliases_for_id(const void *blob, const char *name, |
| enum fdt_compat_id id, int *node_list, int maxcount) |
| { |
| int name_len = strlen(name); |
| int nodes[maxcount]; |
| int num_found = 0; |
| int offset, node; |
| int alias_node; |
| int count; |
| int i, j; |
| |
| /* find the alias node if present */ |
| alias_node = fdt_path_offset(blob, "/aliases"); |
| |
| /* |
| * start with nothing, and we can assume that the root node can't |
| * match |
| */ |
| memset(nodes, '\0', sizeof(nodes)); |
| |
| /* First find all the compatible nodes */ |
| for (node = count = 0; node >= 0 && count < maxcount;) { |
| node = fdtdec_next_compatible(blob, node, id); |
| if (node >= 0) |
| nodes[count++] = node; |
| } |
| if (node >= 0) |
| debug("%s: warning: maxcount exceeded with alias '%s'\n", |
| __func__, name); |
| |
| /* Now find all the aliases */ |
| memset(node_list, '\0', sizeof(*node_list) * maxcount); |
| |
| for (offset = fdt_first_property_offset(blob, alias_node); |
| offset > 0; |
| offset = fdt_next_property_offset(blob, offset)) { |
| const struct fdt_property *prop; |
| const char *path; |
| int number; |
| int found; |
| |
| node = 0; |
| prop = fdt_get_property_by_offset(blob, offset, NULL); |
| path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); |
| if (prop->len && 0 == strncmp(path, name, name_len)) |
| node = fdt_path_offset(blob, prop->data); |
| if (node <= 0) |
| continue; |
| |
| /* Get the alias number */ |
| number = simple_strtoul(path + name_len, NULL, 10); |
| if (number < 0 || number >= maxcount) { |
| debug("%s: warning: alias '%s' is out of range\n", |
| __func__, path); |
| continue; |
| } |
| |
| /* Make sure the node we found is actually in our list! */ |
| found = -1; |
| for (j = 0; j < count; j++) |
| if (nodes[j] == node) { |
| found = j; |
| break; |
| } |
| |
| if (found == -1) { |
| debug("%s: warning: alias '%s' points to a node " |
| "'%s' that is missing or is not compatible " |
| " with '%s'\n", __func__, path, |
| fdt_get_name(blob, node, NULL), |
| compat_names[id]); |
| continue; |
| } |
| |
| /* |
| * Add this node to our list in the right place, and mark |
| * it as done. |
| */ |
| if (fdtdec_get_is_enabled(blob, node)) { |
| node_list[number] = node; |
| if (number >= num_found) |
| num_found = number + 1; |
| } |
| nodes[j] = 0; |
| } |
| |
| /* Add any nodes not mentioned by an alias */ |
| for (i = j = 0; i < maxcount; i++) { |
| if (!node_list[i]) { |
| for (; j < maxcount; j++) |
| if (nodes[j] && |
| fdtdec_get_is_enabled(blob, nodes[j])) |
| break; |
| |
| /* Have we run out of nodes to add? */ |
| if (j == maxcount) |
| break; |
| |
| assert(!node_list[i]); |
| node_list[i] = nodes[j++]; |
| if (i >= num_found) |
| num_found = i + 1; |
| } |
| } |
| |
| return num_found; |
| } |
| |
| /* |
| * 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; |
| } |