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authorIgor Opaniuk <igor.opaniuk@toradex.com>2019-12-03 14:04:46 +0200
committerMarcel Ziswiler <marcel.ziswiler@toradex.com>2019-12-23 10:28:03 +0100
commitb3f9a339daa61154d87f890cfa88e5f6abab5ae0 (patch)
treef0db1da76c58739b9027399280261f85678655d3
parent58a7167ff6d3d024b5ed922390ede30e00cd0097 (diff)
common: fdt_support: add support for setting usable memory
Add support for setting linux,usable-memory property in the memory node of device tree for the kernel [1]. This property holds a base address and size, describing a limited region in which memory may be considered available for use by the kernel. Memory outside of this range is not available for use. [1] https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com> Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com> Signed-off-by: Stefan Agner <stefan.agner@toradex.com> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com> (cherry picked from commit 949b5a969d107613b61a1e5eaf9e43c75a97f42c)
-rw-r--r--common/fdt_support.c35
-rw-r--r--include/fdt_support.h1
2 files changed, 36 insertions, 0 deletions
diff --git a/common/fdt_support.c b/common/fdt_support.c
index f31e9b0cc5..6c40757f51 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -466,6 +466,41 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
}
return 0;
}
+
+int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas)
+{
+ int err, nodeoffset;
+ int len;
+ u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */
+
+ if (areas > 8) {
+ printf("%s: num areas %d exceeds hardcoded limit %d\n",
+ __func__, areas, 8);
+ return -1;
+ }
+
+ err = fdt_check_header(blob);
+ if (err < 0) {
+ printf("%s: %s\n", __func__, fdt_strerror(err));
+ return err;
+ }
+
+ /* find or create "/memory" node. */
+ nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory");
+ if (nodeoffset < 0)
+ return nodeoffset;
+
+ len = fdt_pack_reg(blob, tmp, start, size, areas);
+
+ err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len);
+ if (err < 0) {
+ printf("WARNING: could not set %s %s.\n",
+ "reg", fdt_strerror(err));
+ return err;
+ }
+
+ return 0;
+}
#endif
int fdt_fixup_memory(void *blob, u64 start, u64 size)
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 27fe564f0b..ec08372ac8 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -94,6 +94,7 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size);
*/
#ifdef CONFIG_ARCH_FIXUP_FDT_MEMORY
int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks);
+int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int banks);
#else
static inline int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[],
int banks)