fdt: add memory bank decoding functions for board setup
Add two functions for use by board implementations to decode the memory
banks of the /memory node so as to populate the global data with
ram_size and board info for memory banks.
The fdtdec_setup_memory_size() function decodes the first memory bank
and sets up the gd->ram_size with the size of the memory bank. This
function should be called from the boards dram_init().
The fdtdec_setup_memory_banksize() function decode the memory banks
(up to the CONFIG_NR_DRAM_BANKS) and populates the base address and size
into the gd->bd->bi_dram array of banks. This function should be called
from the boards dram_init_banksize().
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Michal Simek <monstr@monstr.eu>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 4e619c4..81f47ef 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1174,6 +1174,62 @@
return ret;
}
+int fdtdec_setup_memory_size(void)
+{
+ int ret, mem;
+ struct fdt_resource res;
+
+ mem = fdt_path_offset(gd->fdt_blob, "/memory");
+ if (mem < 0) {
+ debug("%s: Missing /memory node\n", __func__);
+ return -EINVAL;
+ }
+
+ ret = fdt_get_resource(gd->fdt_blob, mem, "reg", 0, &res);
+ if (ret != 0) {
+ debug("%s: Unable to decode first memory bank\n", __func__);
+ return -EINVAL;
+ }
+
+ gd->ram_size = (phys_size_t)(res.end - res.start + 1);
+ debug("%s: Initial DRAM size %llx\n", __func__, (u64)gd->ram_size);
+
+ return 0;
+}
+
+#if defined(CONFIG_NR_DRAM_BANKS)
+int fdtdec_setup_memory_banksize(void)
+{
+ int bank, ret, mem;
+ struct fdt_resource res;
+
+ mem = fdt_path_offset(gd->fdt_blob, "/memory");
+ if (mem < 0) {
+ debug("%s: Missing /memory node\n", __func__);
+ return -EINVAL;
+ }
+
+ for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
+ ret = fdt_get_resource(gd->fdt_blob, mem, "reg", bank, &res);
+ if (ret == -FDT_ERR_NOTFOUND)
+ break;
+ if (ret != 0)
+ return -EINVAL;
+
+ gd->bd->bi_dram[bank].start = (phys_addr_t)res.start;
+ gd->bd->bi_dram[bank].size =
+ (phys_size_t)(res.end - res.start + 1);
+
+ debug("%s: DRAM Bank #%d: start = 0x%llx, size = 0x%llx\n",
+ __func__, bank,
+ (unsigned long long)gd->bd->bi_dram[bank].start,
+ (unsigned long long)gd->bd->bi_dram[bank].size);
+ }
+
+ return 0;
+}
+#endif
+
int fdtdec_setup(void)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)