Move dtc and libfdt sources from arch/powerpc/boot to scripts/dtc

The powerpc kernel always requires an Open Firmware like device tree
to supply device information.  On systems without OF, this comes from
a flattened device tree blob.  This blob is usually generated by dtc,
a tool which compiles a text description of the device tree into the
flattened format used by the kernel.  Sometimes, the bootwrapper makes
small changes to the pre-compiled device tree blob (e.g. filling in
the size of RAM).  To do this it uses the libfdt library.

Because these are only used on powerpc, the code for both these tools
is included under arch/powerpc/boot (these were imported and are
periodically updated from the upstream dtc tree).

However, the microblaze architecture, currently being prepared for
merging to mainline also uses dtc to produce device tree blobs.  A few
other archs have also mentioned some interest in using dtc.
Therefore, this patch moves dtc and libfdt from arch/powerpc into
scripts, where it can be used by any architecture.

The vast bulk of this patch is a literal move, the rest is adjusting
the various Makefiles to use dtc and libfdt correctly from their new
locations.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

33 files changed, 83 insertions, 45 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 4c78045513621..a0d1146a05785 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -181,6 +181,10 @@ config SYS_SUPPORTS_APM_EMULATION
 	default y if PMAC_APM_EMU
 	bool
 
+config DTC
+       bool
+       default y
+
 config DEFAULT_UIMAGE
 	bool
 	help
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 4458abb67c51b..8da2bf963b576 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -33,7 +33,7 @@ ifeq ($(call cc-option-yn, -fstack-protector),y)
 BOOTCFLAGS	+= -fno-stack-protector
 endif
 
-BOOTCFLAGS	+= -I$(obj) -I$(srctree)/$(obj) -I$(srctree)/$(src)/libfdt
+BOOTCFLAGS	+= -I$(obj) -I$(srctree)/$(obj)
 
 DTS_FLAGS	?= -p 1024
 
@@ -53,9 +53,14 @@ zliblinuxheader := zlib.h zconf.h zutil.h
 $(addprefix $(obj)/,$(zlib) cuboot-c2k.o gunzip_util.o main.o prpmc2800.o): \
 	$(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
 
-src-libfdt := fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c
+libfdt       := fdt.c fdt_ro.c fdt_wip.c fdt_sw.c fdt_rw.c fdt_strerror.c
+libfdtheader := fdt.h libfdt.h libfdt_internal.h
+
+$(addprefix $(obj)/,$(libfdt) libfdt-wrapper.o simpleboot.o): \
+	$(addprefix $(obj)/,$(libfdtheader))
+
 src-wlib := string.S crt0.S crtsavres.S stdio.c main.c \
-		$(addprefix libfdt/,$(src-libfdt)) libfdt-wrapper.c \
+		$(libfdt) libfdt-wrapper.c \
 		ns16550.c serial.c simple_alloc.c div64.S util.S \
 		gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \
 		4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c \
@@ -96,6 +101,12 @@ $(addprefix $(obj)/,$(zlibheader)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
 $(addprefix $(obj)/,$(zliblinuxheader)): $(obj)/%: $(srctree)/include/linux/%
 	$(call cmd,copy_zliblinuxheader)
 
+quiet_cmd_copy_libfdt = COPY    $@
+      cmd_copy_libfdt = cp $< $@
+
+$(addprefix $(obj)/,$(libfdt) $(libfdtheader)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
+	$(call cmd,copy_libfdt)
+
 $(obj)/empty.c:
 	@touch $@
 
@@ -103,6 +114,7 @@ $(obj)/zImage.lds $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds: $(obj)/%: $(srct
 	@cp $< $@
 
 clean-files := $(zlib) $(zlibheader) $(zliblinuxheader) \
+		$(libfdt) $(libfdtheader) \
 		empty.c zImage.coff.lds zImage.ps3.lds zImage.lds
 
 quiet_cmd_bootcc = BOOTCC  $@
@@ -114,6 +126,8 @@ quiet_cmd_bootas = BOOTAS  $@
 quiet_cmd_bootar = BOOTAR  $@
       cmd_bootar = $(CROSS32AR) -cr $@.$$$$ $(filter-out FORCE,$^); mv $@.$$$$ $@
 
+$(obj-libfdt): $(obj)/%.o: $(srctree)/scripts/dtc/libfdt/%.c FORCE
+	$(call if_changed_dep,bootcc)
 $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c FORCE
 	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,bootcc)
@@ -124,7 +138,7 @@ $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S FORCE
 $(obj)/wrapper.a: $(obj-wlib) FORCE
 	$(call if_changed,bootar)
 
-hostprogs-y	:= addnote addRamDisk hack-coff mktree dtc
+hostprogs-y	:= addnote addRamDisk hack-coff mktree
 
 targets		+= $(patsubst $(obj)/%,%,$(obj-boot) wrapper.a)
 extra-y		:= $(obj)/wrapper.a $(obj-plat) $(obj)/empty.o \
@@ -133,47 +147,10 @@ extra-y		:= $(obj)/wrapper.a $(obj-plat) $(obj)/empty.o \
 dtstree		:= $(srctree)/$(src)/dts
 
 wrapper		:=$(srctree)/$(src)/wrapper
-wrapperbits	:= $(extra-y) $(addprefix $(obj)/,addnote hack-coff mktree dtc) \
+wrapperbits	:= $(extra-y) $(addprefix $(obj)/,addnote hack-coff mktree) \
 			$(wrapper) FORCE
 
 #############
-# Bits for building dtc
-# DTC_GENPARSER      := 1    # Uncomment to rebuild flex/bison output
-
-dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o srcpos.o checks.o
-dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o
-dtc-objs := $(addprefix dtc-src/, $(dtc-objs))
-
-# prerequisites on generated files needs to be explicit
-$(obj)/dtc-src/dtc-parser.tab.o: $(obj)/dtc-src/dtc-parser.tab.c $(obj)/dtc-src/dtc-parser.tab.h
-$(obj)/dtc-src/dtc-lexer.lex.o:  $(obj)/dtc-src/dtc-lexer.lex.c $(obj)/dtc-src/dtc-parser.tab.h
-
-HOSTCFLAGS += -I$(src)/dtc-src/ -I$(src)/libfdt/
-
-targets += dtc-src/dtc-parser.tab.c
-targets += dtc-src/dtc-lexer.lex.c
-
-clean-files += dtc-src/dtc-parser.tab.h
-
-ifdef DTC_GENPARSER
-BISON = bison
-FLEX = flex
-
-quiet_cmd_bison = BISON   $@
-      cmd_bison = $(BISON) -o$@ -d $<; cp $@ $@_shipped
-quiet_cmd_flex = FLEX    $@
-      cmd_flex = $(FLEX) -o$@ $<; cp $@ $@_shipped
-
-$(obj)/dtc-src/dtc-parser.tab.c: $(src)/dtc-src/dtc-parser.y FORCE
-	$(call if_changed,bison)
-
-$(obj)/dtc-src/dtc-parser.tab.h: $(obj)/dtc-src/dtc-parser.tab.c
-
-$(obj)/dtc-src/dtc-lexer.lex.c: $(src)/dtc-src/dtc-lexer.l FORCE
-	$(call if_changed,flex)
-endif
-
-#############
 # Bits for building various flavours of zImage
 
 ifneq ($(CROSS32_COMPILE),)
@@ -347,8 +324,10 @@ $(obj)/treeImage.%: vmlinux $(obj)/%.dtb $(wrapperbits)
 	$(call if_changed,wrap,treeboot-$*,,$(obj)/$*.dtb)
 
 # Rule to build device tree blobs
-$(obj)/%.dtb: $(dtstree)/%.dts $(obj)/dtc
-	$(obj)/dtc -O dtb -o $(obj)/$*.dtb -b 0 $(DTS_FLAGS) $(dtstree)/$*.dts
+DTC = $(objtree)/scripts/dtc/dtc
+
+$(obj)/%.dtb: $(dtstree)/%.dts
+	$(DTC) -O dtb -o $(obj)/$*.dtb -b 0 $(DTS_FLAGS) $(dtstree)/$*.dts
 
 # If there isn't a platform selected then just strip the vmlinux.
 ifeq (,$(image-y))
diff --git a/arch/powerpc/boot/simpleboot.c b/arch/powerpc/boot/simpleboot.c
index c58a0dada992e..21cd48074ec8c 100644
--- a/arch/powerpc/boot/simpleboot.c
+++ b/arch/powerpc/boot/simpleboot.c
@@ -19,7 +19,7 @@
 #include "types.h"
 #include "io.h"
 #include "stdio.h"
-#include "libfdt/libfdt.h"
+#include <libfdt.h>
 
 BSS_STACK(4*1024);
 
diff --git a/scripts/Makefile b/scripts/Makefile
index aafdf064feefd..9dd5b25a1d534 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -21,6 +21,7 @@ hostprogs-y += unifdef
 subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-y                     += mod
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux
+subdir-$(CONFIG_DTC)         += dtc
 
 # Let clean descend into subdirs
 subdir-	+= basic kconfig package selinux
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
new file mode 100644
index 0000000000000..01cdb36fc5832
--- /dev/null
+++ b/scripts/dtc/Makefile
@@ -0,0 +1,54 @@
+# scripts/dtc makefile
+
+hostprogs-y	:= dtc
+always		:= $(hostprogs-y)
+
+dtc-objs	:= dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
+		   srcpos.o checks.o
+dtc-objs	+= dtc-lexer.lex.o dtc-parser.tab.o
+
+# Source files need to get at the userspace version of libfdt_env.h to compile
+
+HOSTCFLAGS_DTC := -I$(src) -I$(src)/libfdt
+
+HOSTCFLAGS_checks.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_data.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_dtc.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_flattree.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_fstree.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_livetree.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_srcpos.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_treesource.o := $(HOSTCFLAGS_DTC)
+
+HOSTCFLAGS_dtc-lexer.lex.o := $(HOSTCFLAGS_DTC)
+HOSTCFLAGS_dtc-parser.tab.o := $(HOSTCFLAGS_DTC)
+
+# dependencies on generated files need to be listed explicitly
+$(obj)/dtc-parser.tab.o: $(obj)/dtc-parser.tab.c $(obj)/dtc-parser.tab.h
+$(obj)/dtc-lexer.lex.o:  $(obj)/dtc-lexer.lex.c $(obj)/dtc-parser.tab.h
+
+targets += dtc-parser.tab.c dtc-lexer.lex.c
+
+clean-files += dtc-parser.tab.h
+
+# GENERATE_PARSER := 1		# Uncomment to rebuild flex/bison output
+
+ifdef GENERATE_PARSER
+
+BISON = bison
+FLEX = flex
+
+quiet_cmd_bison = BISON   $@
+      cmd_bison = $(BISON) -o$@ -d $<; cp $@ $@_shipped
+quiet_cmd_flex = FLEX    $@
+      cmd_flex = $(FLEX) -o$@ $<; cp $@ $@_shipped
+
+$(obj)/dtc-parser.tab.c: $(src)/dtc-parser.y FORCE
+        $(call if_changed,bison)
+
+$(obj)/dtc-parser.tab.h: $(obj)/dtc-parser.tab.c
+
+$(obj)/dtc-lexer.lex.c: $(src)/dtc-lexer.l FORCE
+        $(call if_changed,flex)
+
+endif
diff --git a/arch/powerpc/boot/dtc-src/Makefile.dtc b/scripts/dtc/Makefile.dtc
index 6ddf9ecac6698..6ddf9ecac6698 100644
--- a/arch/powerpc/boot/dtc-src/Makefile.dtc
+++ b/scripts/dtc/Makefile.dtc
diff --git a/arch/powerpc/boot/dtc-src/checks.c b/scripts/dtc/checks.c
index 95485796f253f..95485796f253f 100644
--- a/arch/powerpc/boot/dtc-src/checks.c
+++ b/scripts/dtc/checks.c
diff --git a/arch/powerpc/boot/dtc-src/data.c b/scripts/dtc/data.c
index dd2e3d39d4c1b..dd2e3d39d4c1b 100644
--- a/arch/powerpc/boot/dtc-src/data.c
+++ b/scripts/dtc/data.c
diff --git a/arch/powerpc/boot/dtc-src/dtc-lexer.l b/scripts/dtc/dtc-lexer.l
index 44dbfd3f09765..44dbfd3f09765 100644
--- a/arch/powerpc/boot/dtc-src/dtc-lexer.l
+++ b/scripts/dtc/dtc-lexer.l
diff --git a/arch/powerpc/boot/dtc-src/dtc-lexer.lex.c_shipped b/scripts/dtc/dtc-lexer.lex.c_shipped
index ac392cb040f61..ac392cb040f61 100644
--- a/arch/powerpc/boot/dtc-src/dtc-lexer.lex.c_shipped
+++ b/scripts/dtc/dtc-lexer.lex.c_shipped
diff --git a/arch/powerpc/boot/dtc-src/dtc-parser.tab.c_shipped b/scripts/dtc/dtc-parser.tab.c_shipped
index 27129377e5d21..27129377e5d21 100644
--- a/arch/powerpc/boot/dtc-src/dtc-parser.tab.c_shipped
+++ b/scripts/dtc/dtc-parser.tab.c_shipped
diff --git a/arch/powerpc/boot/dtc-src/dtc-parser.tab.h_shipped b/scripts/dtc/dtc-parser.tab.h_shipped
index ba99100d55c98..ba99100d55c98 100644
--- a/arch/powerpc/boot/dtc-src/dtc-parser.tab.h_shipped
+++ b/scripts/dtc/dtc-parser.tab.h_shipped
diff --git a/arch/powerpc/boot/dtc-src/dtc-parser.y b/scripts/dtc/dtc-parser.y
index b2ab562420ead..b2ab562420ead 100644
--- a/arch/powerpc/boot/dtc-src/dtc-parser.y
+++ b/scripts/dtc/dtc-parser.y
diff --git a/arch/powerpc/boot/dtc-src/dtc.c b/scripts/dtc/dtc.c
index d8fd43b4ac1a5..d8fd43b4ac1a5 100644
--- a/arch/powerpc/boot/dtc-src/dtc.c
+++ b/scripts/dtc/dtc.c
diff --git a/arch/powerpc/boot/dtc-src/dtc.h b/scripts/dtc/dtc.h
index 08d54c8700863..08d54c8700863 100644
--- a/arch/powerpc/boot/dtc-src/dtc.h
+++ b/scripts/dtc/dtc.h
diff --git a/arch/powerpc/boot/dtc-src/flattree.c b/scripts/dtc/flattree.c
index 76acd28c068db..76acd28c068db 100644
--- a/arch/powerpc/boot/dtc-src/flattree.c
+++ b/scripts/dtc/flattree.c
diff --git a/arch/powerpc/boot/dtc-src/fstree.c b/scripts/dtc/fstree.c
index 766b2694d9358..766b2694d9358 100644
--- a/arch/powerpc/boot/dtc-src/fstree.c
+++ b/scripts/dtc/fstree.c
diff --git a/arch/powerpc/boot/libfdt/Makefile.libfdt b/scripts/dtc/libfdt/Makefile.libfdt
index 6c42acfa21ec6..6c42acfa21ec6 100644
--- a/arch/powerpc/boot/libfdt/Makefile.libfdt
+++ b/scripts/dtc/libfdt/Makefile.libfdt
diff --git a/arch/powerpc/boot/libfdt/fdt.c b/scripts/dtc/libfdt/fdt.c
index 2acaec5923aea..2acaec5923aea 100644
--- a/arch/powerpc/boot/libfdt/fdt.c
+++ b/scripts/dtc/libfdt/fdt.c
diff --git a/arch/powerpc/boot/libfdt/fdt.h b/scripts/dtc/libfdt/fdt.h
index 48ccfd9100002..48ccfd9100002 100644
--- a/arch/powerpc/boot/libfdt/fdt.h
+++ b/scripts/dtc/libfdt/fdt.h
diff --git a/arch/powerpc/boot/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c
index fbbba44fcd0d0..fbbba44fcd0d0 100644
--- a/arch/powerpc/boot/libfdt/fdt_ro.c
+++ b/scripts/dtc/libfdt/fdt_ro.c
diff --git a/arch/powerpc/boot/libfdt/fdt_rw.c b/scripts/dtc/libfdt/fdt_rw.c
index 8e7ec4cb7bcdc..8e7ec4cb7bcdc 100644
--- a/arch/powerpc/boot/libfdt/fdt_rw.c
+++ b/scripts/dtc/libfdt/fdt_rw.c
diff --git a/arch/powerpc/boot/libfdt/fdt_strerror.c b/scripts/dtc/libfdt/fdt_strerror.c
index e6c3ceee8c58c..e6c3ceee8c58c 100644
--- a/arch/powerpc/boot/libfdt/fdt_strerror.c
+++ b/scripts/dtc/libfdt/fdt_strerror.c
diff --git a/arch/powerpc/boot/libfdt/fdt_sw.c b/scripts/dtc/libfdt/fdt_sw.c
index 698329e0ccaf8..698329e0ccaf8 100644
--- a/arch/powerpc/boot/libfdt/fdt_sw.c
+++ b/scripts/dtc/libfdt/fdt_sw.c
diff --git a/arch/powerpc/boot/libfdt/fdt_wip.c b/scripts/dtc/libfdt/fdt_wip.c
index a4652c6e787ec..a4652c6e787ec 100644
--- a/arch/powerpc/boot/libfdt/fdt_wip.c
+++ b/scripts/dtc/libfdt/fdt_wip.c
diff --git a/arch/powerpc/boot/libfdt/libfdt.h b/scripts/dtc/libfdt/libfdt.h
index ce80e4fb41b2b..ce80e4fb41b2b 100644
--- a/arch/powerpc/boot/libfdt/libfdt.h
+++ b/scripts/dtc/libfdt/libfdt.h
diff --git a/arch/powerpc/boot/dtc-src/libfdt_env.h b/scripts/dtc/libfdt/libfdt_env.h
index 449bf602daf1f..449bf602daf1f 100644
--- a/arch/powerpc/boot/dtc-src/libfdt_env.h
+++ b/scripts/dtc/libfdt/libfdt_env.h
diff --git a/arch/powerpc/boot/libfdt/libfdt_internal.h b/scripts/dtc/libfdt/libfdt_internal.h
index 46eb93e4af5c4..46eb93e4af5c4 100644
--- a/arch/powerpc/boot/libfdt/libfdt_internal.h
+++ b/scripts/dtc/libfdt/libfdt_internal.h
diff --git a/arch/powerpc/boot/dtc-src/livetree.c b/scripts/dtc/livetree.c
index 0ca3de550b3ff..0ca3de550b3ff 100644
--- a/arch/powerpc/boot/dtc-src/livetree.c
+++ b/scripts/dtc/livetree.c
diff --git a/arch/powerpc/boot/dtc-src/srcpos.c b/scripts/dtc/srcpos.c
index 9641b7628b4de..9641b7628b4de 100644
--- a/arch/powerpc/boot/dtc-src/srcpos.c
+++ b/scripts/dtc/srcpos.c
diff --git a/arch/powerpc/boot/dtc-src/srcpos.h b/scripts/dtc/srcpos.h
index e17c7c04db8ea..e17c7c04db8ea 100644
--- a/arch/powerpc/boot/dtc-src/srcpos.h
+++ b/scripts/dtc/srcpos.h
diff --git a/arch/powerpc/boot/dtc-src/treesource.c b/scripts/dtc/treesource.c
index ebeb6eb27907d..ebeb6eb27907d 100644
--- a/arch/powerpc/boot/dtc-src/treesource.c
+++ b/scripts/dtc/treesource.c
diff --git a/arch/powerpc/boot/dtc-src/version_gen.h b/scripts/dtc/version_gen.h
index 658ff42429d64..658ff42429d64 100644
--- a/arch/powerpc/boot/dtc-src/version_gen.h
+++ b/scripts/dtc/version_gen.h