148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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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 <libfdt.h>
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#include <fdtdec.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Here are the type we know about. One day we might allow drivers to
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* register. For now we just put them here. The COMPAT macro allows us to
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* turn this into a sparse list later, and keeps the ID with the name.
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*/
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#define COMPAT(id, name) name
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static const char * const compat_names[COMPAT_COUNT] = {
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};
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/**
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* Look in the FDT for an alias with the given name and return its node.
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*
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* @param blob FDT blob
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* @param name alias name to look up
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* @return node offset if found, or an error code < 0 otherwise
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*/
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static int find_alias_node(const void *blob, const char *name)
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{
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const char *path;
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int alias_node;
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debug("find_alias_node: %s\n", name);
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alias_node = fdt_path_offset(blob, "/aliases");
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if (alias_node < 0)
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return alias_node;
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path = fdt_getprop(blob, alias_node, name, NULL);
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if (!path)
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return -FDT_ERR_NOTFOUND;
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return fdt_path_offset(blob, path);
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}
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fdt_addr_t fdtdec_get_addr(const void *blob, int node,
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const char *prop_name)
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{
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const fdt_addr_t *cell;
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int len;
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debug("get_addr: %s\n", prop_name);
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cell = fdt_getprop(blob, node, prop_name, &len);
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if (cell && (len == sizeof(fdt_addr_t) ||
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len == sizeof(fdt_addr_t) * 2))
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return fdt_addr_to_cpu(*cell);
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return FDT_ADDR_T_NONE;
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}
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s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
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s32 default_val)
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{
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const s32 *cell;
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int len;
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debug("get_size: %s\n", prop_name);
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cell = fdt_getprop(blob, node, prop_name, &len);
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if (cell && len >= sizeof(s32))
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return fdt32_to_cpu(cell[0]);
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return default_val;
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}
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int fdtdec_get_is_enabled(const void *blob, int node, int default_val)
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{
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const char *cell;
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cell = fdt_getprop(blob, node, "status", NULL);
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if (cell)
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return 0 == strcmp(cell, "ok");
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return default_val;
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}
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enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
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{
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enum fdt_compat_id id;
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/* Search our drivers */
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for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
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if (0 == fdt_node_check_compatible(blob, node,
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compat_names[id]))
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return id;
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return COMPAT_UNKNOWN;
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}
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int fdtdec_next_compatible(const void *blob, int node,
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enum fdt_compat_id id)
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{
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return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
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}
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int fdtdec_next_alias(const void *blob, const char *name,
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enum fdt_compat_id id, int *upto)
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{
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#define MAX_STR_LEN 20
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char str[MAX_STR_LEN + 20];
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int node, err;
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/* snprintf() is not available */
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assert(strlen(name) < MAX_STR_LEN);
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sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
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(*upto)++;
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node = find_alias_node(blob, str);
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if (node < 0)
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return node;
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err = fdt_node_check_compatible(blob, node, compat_names[id]);
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if (err < 0)
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return err;
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return err ? -FDT_ERR_NOTFOUND : node;
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}
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/*
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* This function is a little odd in that it accesses global data. At some
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* point if the architecture board.c files merge this will make more sense.
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* Even now, it is common code.
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*/
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int fdtdec_check_fdt(void)
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{
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/* We must have an fdt */
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if (fdt_check_header(gd->fdt_blob))
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panic("No valid fdt found - please append one to U-Boot\n"
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"binary or define CONFIG_OF_EMBED\n");
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return 0;
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}
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