diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/fdtdec.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 4dbd6ae..9c332ad 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -793,4 +793,65 @@ int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf) return 0; } + +int fdtdec_decode_memory_region(const void *blob, int config_node, + const char *mem_type, const char *suffix, + fdt_addr_t *basep, fdt_size_t *sizep) +{ + char prop_name[50]; + const char *mem; + fdt_size_t size, offset_size; + fdt_addr_t base, offset; + int node; + + if (config_node == -1) { + config_node = fdt_path_offset(blob, "/config"); + if (config_node < 0) { + debug("%s: Cannot find /config node\n", __func__); + return -ENOENT; + } + } + if (!suffix) + suffix = ""; + + snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, + suffix); + mem = fdt_getprop(blob, config_node, prop_name, NULL); + if (!mem) { + debug("%s: No memory type for '%s', using /memory\n", __func__, + prop_name); + mem = "/memory"; + } + + node = fdt_path_offset(blob, mem); + if (node < 0) { + debug("%s: Failed to find node '%s': %s\n", __func__, mem, + fdt_strerror(node)); + return -ENOENT; + } + + /* + * Not strictly correct - the memory may have multiple banks. We just + * use the first + */ + if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { + debug("%s: Failed to decode memory region %s\n", __func__, + mem); + return -EINVAL; + } + + snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, + suffix); + if (fdtdec_decode_region(blob, config_node, prop_name, &offset, + &offset_size)) { + debug("%s: Failed to decode memory region '%s'\n", __func__, + prop_name); + return -EINVAL; + } + + *basep = base + offset; + *sizep = offset_size; + + return 0; +} #endif |