drivers/core/of_extra.c

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