fdt: sandbox: Move setup code from board_f to fdtdec

We want to be able to set up the device tree in SPL, so move this code
to a common place.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 49 insertions, 0 deletions

diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index f0dafedc254..168f2efa33e 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm/root.h>
 #include <os.h>
+#include <asm/io.h>
 #include <asm/state.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -97,3 +98,43 @@ phys_addr_t map_to_sysmem(const void *ptr)
 void flush_dcache_range(unsigned long start, unsigned long stop)
 {
 }
+
+int sandbox_read_fdt_from_file(void)
+{
+	struct sandbox_state *state = state_get_current();
+	const char *fname = state->fdt_fname;
+	void *blob;
+	loff_t size;
+	int err;
+	int fd;
+
+	blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
+	if (!state->fdt_fname) {
+		err = fdt_create_empty_tree(blob, 256);
+		if (!err)
+			goto done;
+		printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
+		return -EINVAL;
+	}
+
+	err = os_get_filesize(fname, &size);
+	if (err < 0) {
+		printf("Failed to file FDT file '%s'\n", fname);
+		return err;
+	}
+	fd = os_open(fname, OS_O_RDONLY);
+	if (fd < 0) {
+		printf("Failed to open FDT file '%s'\n", fname);
+		return -EACCES;
+	}
+	if (os_read(fd, blob, size) != size) {
+		os_close(fd);
+		return -EIO;
+	}
+	os_close(fd);
+
+done:
+	gd->fdt_blob = blob;
+
+	return 0;
+}
diff --git a/arch/sandbox/include/asm/u-boot-sandbox.h b/arch/sandbox/include/asm/u-boot-sandbox.h
index d5b93616839..da87cc30406 100644
--- a/arch/sandbox/include/asm/u-boot-sandbox.h
+++ b/arch/sandbox/include/asm/u-boot-sandbox.h
@@ -75,4 +75,12 @@ int pci_unmap_physmem(const void *addr, unsigned long len,
  */
 void sandbox_set_enable_pci_map(int enable);
 
+/**
+ * sandbox_read_fdt_from_file() - Read a device tree from a file
+ *
+ * Read a device tree file from a host file and set it up for use as the
+ * control FDT.
+ */
+int sandbox_read_fdt_from_file(void);
+
 #endif	/* _U_BOOT_SANDBOX_H_ */