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>

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;
+}

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_ */

common/board_f.c

@@ -282,49 +282,6 @@ __weak int arch_cpu_init(void)
 	return 0;
 }
 
-#ifdef CONFIG_OF_HOSTFILE
-
-static int 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;
-}
-#endif
-
 #ifdef CONFIG_SANDBOX
 static int setup_ram_buf(void)
 {
@@ -337,28 +294,6 @@ static int setup_ram_buf(void)
 }
 #endif
 
-static int setup_fdt(void)
-{
-#ifdef CONFIG_OF_CONTROL
-# ifdef CONFIG_OF_EMBED
-	/* Get a pointer to the FDT */
-	gd->fdt_blob = __dtb_dt_begin;
-# elif defined CONFIG_OF_SEPARATE
-	/* FDT is at end of image */
-	gd->fdt_blob = (ulong *)&_end;
-# elif defined(CONFIG_OF_HOSTFILE)
-	if (read_fdt_from_file()) {
-		puts("Failed to read control FDT\n");
-		return -1;
-	}
-# endif
-	/* Allow the early environment to override the fdt address */
-	gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
-						(uintptr_t)gd->fdt_blob);
-#endif
-	return 0;
-}
-
 /* Get the top of usable RAM */
 __weak ulong board_get_usable_ram_top(ulong total_size)
 {
@@ -826,7 +761,9 @@ static init_fnc_t init_sequence_f[] = {
 	setup_ram_buf,
 #endif
 	setup_mon_len,
+#ifdef CONFIG_OF_CONTROL
 	setup_fdt,
+#endif
 #ifdef CONFIG_TRACE
 	trace_early_init,
 #endif

include/fdtdec.h

@@ -793,4 +793,10 @@ int fdt_get_named_resource(const void *fdt, int node, const char *property,
 int fdtdec_decode_memory_region(const void *blob, int node,
 				const char *mem_type, const char *suffix,
 				fdt_addr_t *basep, fdt_size_t *sizep);
+
+/**
+ * Set up the device tree ready for use
+ */
+int setup_fdt(void);
+
 #endif

lib/fdtdec.c

@@ -9,6 +9,7 @@
 #include <serial.h>
 #include <libfdt.h>
 #include <fdtdec.h>
+#include <asm/sections.h>
 #include <linux/ctype.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -1037,4 +1038,34 @@ int fdtdec_decode_memory_region(const void *blob, int config_node,
 
 	return 0;
 }
+
+int setup_fdt(void)
+{
+#ifdef CONFIG_OF_CONTROL
+# ifdef CONFIG_OF_EMBED
+	/* Get a pointer to the FDT */
+	gd->fdt_blob = __dtb_dt_begin;
+# elif defined CONFIG_OF_SEPARATE
+#  ifdef CONFIG_SPL_BUILD
+	/* FDT is at end of BSS */
+	gd->fdt_blob = (ulong *)&__bss_end;
+#  else
+	/* FDT is at end of image */
+	gd->fdt_blob = (ulong *)&_end;
 #endif
+# elif defined(CONFIG_OF_HOSTFILE)
+	if (sandbox_read_fdt_from_file()) {
+		puts("Failed to read control FDT\n");
+		return -1;
+	}
+# endif
+# ifndef CONFIG_SPL_BUILD
+	/* Allow the early environment to override the fdt address */
+	gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
+						(uintptr_t)gd->fdt_blob);
+# endif
+#endif
+	return 0;
+}
+
+#endif /* !USE_HOSTCC */