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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>
This commit is contained in:
Igor Opaniuk 2019-12-03 14:04:46 +02:00 committed by Stefano Babic
parent 1fae23899c
commit 949b5a969d
2 changed files with 36 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
common/fdt_support.c
View File

@ -467,6 +467,41 @@ 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)

1
include/fdt_support.h
View File

@ -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)