Commit 9fffb55f authored by David Gibson's avatar David Gibson Committed by Linus Torvalds
Browse files

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: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent afc1e702

arch/powerpc/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/boot/Makefile

+23 −44
Original line number Diff line number Diff line
@@ -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 \
@@ -133,46 +147,9 @@ 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
@@ -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))

arch/powerpc/boot/simpleboot.c

+1 −1
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 
#include "types.h"

#include "io.h"

#include "stdio.h"

#include "libfdt/libfdt.h"

#include <libfdt.h>



BSS_STACK(4*1024);

scripts/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

scripts/dtc/Makefile

0 → 100644
+54 −0
Original line number Diff line number Diff line 
# 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

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