@@ -34,3 +34,84 @@ int ofnode_read_fmap_entry(ofnode node, struct fmap_entry *entry)
return 0;
}
+
+int ofnode_decode_region(ofnode node, const char *prop_name, fdt_addr_t *basep,
+ fdt_size_t *sizep)
+{
+ const fdt_addr_t *cell;
+ int len;
+
+ debug("%s: %s: %s\n", __func__, ofnode_get_name(node), prop_name);
+ cell = ofnode_get_property(node, prop_name, &len);
+ if (!cell || (len < sizeof(fdt_addr_t) * 2)) {
+ debug("cell=%p, len=%d\n", cell, len);
+ return -1;
+ }
+
+ *basep = fdt_addr_to_cpu(*cell);
+ *sizep = fdt_size_to_cpu(cell[1]);
+ debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep,
+ (ulong)*sizep);
+
+ return 0;
+}
+
+int ofnode_decode_memory_region(ofnode 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;
+ ofnode node;
+
+ if (!ofnode_valid(config_node)) {
+ config_node = ofnode_path("/config");
+ if (!ofnode_valid(config_node)) {
+ 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 = ofnode_read_string(config_node, prop_name);
+ if (!mem) {
+ debug("%s: No memory type for '%s', using /memory\n", __func__,
+ prop_name);
+ mem = "/memory";
+ }
+
+ node = ofnode_path(mem);
+ if (!ofnode_valid(node)) {
+ debug("%s: Failed to find node '%s'\n", __func__, mem);
+ return -ENOENT;
+ }
+
+ /*
+ * Not strictly correct - the memory may have multiple banks. We just
+ * use the first
+ */
+ if (ofnode_decode_region(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 (ofnode_decode_region(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;
+}
@@ -40,4 +40,49 @@ struct fmap_entry {
*/
int ofnode_read_fmap_entry(ofnode node, struct fmap_entry *entry);
+/**
+ * ofnode_decode_region() - Decode a memory region from a node
+ *
+ * Look up a property in a node which contains a memory region address and
+ * size. Then return a pointer to this address.
+ *
+ * The property must hold one address with a length. This is only tested on
+ * 32-bit machines.
+ *
+ * @param node ofnode to examine
+ * @param prop_name name of property to find
+ * @param basep Returns base address of region
+ * @param size Returns size of region
+ * @return 0 if ok, -1 on error (property not found)
+ */
+int ofnode_decode_region(ofnode node, const char *prop_name, fdt_addr_t *basep,
+ fdt_size_t *sizep);
+
+/**
+ * ofnode_decode_memory_region()- Decode a named region within a memory bank
+ *
+ * This function handles selection of a memory region. The region is
+ * specified as an offset/size within a particular type of memory.
+ *
+ * The properties used are:
+ *
+ * <mem_type>-memory<suffix> for the name of the memory bank
+ * <mem_type>-offset<suffix> for the offset in that bank
+ *
+ * The property value must have an offset and a size. The function checks
+ * that the region is entirely within the memory bank.5
+ *
+ * @param node ofnode containing the properties (-1 for /config)
+ * @param mem_type Type of memory to use, which is a name, such as
+ * "u-boot" or "kernel".
+ * @param suffix String to append to the memory/offset
+ * property names
+ * @param basep Returns base of region
+ * @param sizep Returns size of region
+ * @return 0 if OK, -ive on error
+ */
+int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
+ const char *suffix, fdt_addr_t *basep,
+ fdt_size_t *sizep);
+
#endif
Add a way to decode a memory region, including the memory type (sram or sdram) and its start address and size. Signed-off-by: Simon Glass <sjg@chromium.org> --- drivers/core/of_extra.c | 81 +++++++++++++++++++++++++++++++++++++++++ include/dm/of_extra.h | 45 +++++++++++++++++++++++ 2 files changed, 126 insertions(+)