LXR uboot/drivers/core/of

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (c) 2017 Google, Inc
   4 * Written by Simon Glass <sjg@chromium.org>
   5 */
   6
   7#include <common.h>
   8#include <log.h>
   9#include <linux/libfdt.h>
  10#include <dm/of_access.h>
  11#include <dm/of_extra.h>
  12#include <dm/ofnode.h>
  13
  14int ofnode_read_fmap_entry(ofnode node, struct fmap_entry *entry)
  15{
  16        const char *prop;
  17
  18        if (ofnode_read_u32(node, "image-pos", &entry->offset)) {
  19                debug("Node '%s' has bad/missing 'image-pos' property\n",
  20                      ofnode_get_name(node));
  21                return log_ret(-ENOENT);
  22        }
  23        if (ofnode_read_u32(node, "size", &entry->length)) {
  24                debug("Node '%s' has bad/missing 'size' property\n",
  25                      ofnode_get_name(node));
  26                return log_ret(-ENOENT);
  27        }
  28        entry->used = ofnode_read_s32_default(node, "used", entry->length);
  29        prop = ofnode_read_string(node, "compress");
  30        if (prop) {
  31                if (!strcmp(prop, "lz4"))
  32                        entry->compress_algo = FMAP_COMPRESS_LZ4;
  33                else
  34                        return log_msg_ret("Unknown compression algo",
  35                                           -EINVAL);
  36        } else {
  37                entry->compress_algo = FMAP_COMPRESS_NONE;
  38        }
  39        entry->unc_length = ofnode_read_s32_default(node, "uncomp-size",
  40                                                    entry->length);
  41        prop = ofnode_read_string(node, "hash");
  42        if (prop)
  43                entry->hash_size = strlen(prop);
  44        entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE;
  45        entry->hash = (uint8_t *)prop;
  46
  47        return 0;
  48}
  49
  50int ofnode_decode_region(ofnode node, const char *prop_name, fdt_addr_t *basep,
  51                         fdt_size_t *sizep)
  52{
  53        const fdt_addr_t *cell;
  54        int len;
  55
  56        debug("%s: %s: %s\n", __func__, ofnode_get_name(node), prop_name);
  57        cell = ofnode_get_property(node, prop_name, &len);
  58        if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
  59                debug("cell=%p, len=%d\n", cell, len);
  60                return -1;
  61        }
  62
  63        *basep = fdt_addr_to_cpu(*cell);
  64        *sizep = fdt_size_to_cpu(cell[1]);
  65        debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
  66              (ulong)*sizep);
  67
  68        return 0;
  69}
  70
  71int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
  72                                const char *suffix, fdt_addr_t *basep,
  73                                fdt_size_t *sizep)
  74{
  75        char prop_name[50];
  76        const char *mem;
  77        fdt_size_t size, offset_size;
  78        fdt_addr_t base, offset;
  79        ofnode node;
  80
  81        if (!ofnode_valid(config_node)) {
  82                config_node = ofnode_path("/config");
  83                if (!ofnode_valid(config_node)) {
  84                        debug("%s: Cannot find /config node\n", __func__);
  85                        return -ENOENT;
  86                }
  87        }
  88        if (!suffix)
  89                suffix = "";
  90
  91        snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type,
  92                 suffix);
  93        mem = ofnode_read_string(config_node, prop_name);
  94        if (!mem) {
  95                debug("%s: No memory type for '%s', using /memory\n", __func__,
  96                      prop_name);
  97                mem = "/memory";
  98        }
  99
 100        node = ofnode_path(mem);
 101        if (!ofnode_valid(node)) {
 102                debug("%s: Failed to find node '%s'\n", __func__, mem);
 103                return -ENOENT;
 104        }
 105
 106        /*
 107         * Not strictly correct - the memory may have multiple banks. We just
 108         * use the first
 109         */
 110        if (ofnode_decode_region(node, "reg", &base, &size)) {
 111                debug("%s: Failed to decode memory region %s\n", __func__,
 112                      mem);
 113                return -EINVAL;
 114        }
 115
 116        snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type,
 117                 suffix);
 118        if (ofnode_decode_region(config_node, prop_name, &offset,
 119                                 &offset_size)) {
 120                debug("%s: Failed to decode memory region '%s'\n", __func__,
 121                      prop_name);
 122                return -EINVAL;
 123        }
 124
 125        *basep = base + offset;
 126        *sizep = offset_size;
 127
 128        return 0;
 129}
 130