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David Woodhouse4d2acfb2008-05-23 13:58:12 +01001#
2# kbuild file for firmware/
3#
4
5# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
6# leading /, it's relative to $(srctree).
7fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
8fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
9
10fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
11
David Woodhouse88ecf812008-05-29 11:01:51 +030012# There are three cases to care about:
13# 1. Building kernel with CONFIG_FIRMWARE_IN_KERNEL=y -- $(fw-shipped-y) should
14# include the firmware files to include, according to .config
15# 2. 'make modules_install', which will install firmware for modules, and
16# _also_ for the in-kernel drivers when CONFIG_FIRMWARE_IN_KERNEL=n
17# 3. 'make firmware_install', which installs all firmware, unconditionally.
David Woodhoused172e7f2008-06-25 13:56:07 +010018
David Woodhouse88ecf812008-05-29 11:01:51 +030019# For the former two cases we want $(fw-shipped-y) and $(fw-shipped-m) to be
20# accurate. In the latter case it doesn't matter -- it'll use $(fw-shipped-all).
21# But be aware that the config file might not be included at all.
22
23
24fw-shipped-all := $(fw-shipped-y) $(fw-shipped-m) $(fw-shipped-)
25
26# Directories which we _might_ need to create, so we have a rule for them.
27firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(fw-external-y) $(fw-shipped-all))))
David Woodhouse4d2acfb2008-05-23 13:58:12 +010028
29quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)
30 cmd_mkdir = mkdir -p $@
31
32quiet_cmd_ihex = IHEX $@
33 cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@
34
David Woodhouse8bd6b222008-05-31 15:07:18 +030035quiet_cmd_ihex2fw = IHEX2FW $@
36 cmd_ihex2fw = $(objtree)/$(obj)/ihex2fw $< $@
37
David Woodhouse4d2acfb2008-05-23 13:58:12 +010038quiet_cmd_fwbin = MK_FW $@
39 cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
40 FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
41 firmware/%.gen.S,%,$@))))"; \
42 ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
43 ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
44 PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
45 echo "/* Generated by firmware/Makefile */" > $@;\
46 echo " .section .rodata" >>$@;\
47 echo " .p2align $${ASM_ALIGN}" >>$@;\
48 echo "_fw_$${FWSTR}_bin:" >>$@;\
49 echo " .incbin \"$(2)\"" >>$@;\
50 echo "_fw_end:" >>$@;\
51 echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
52 echo " .p2align $${ASM_ALIGN}" >>$@;\
53 echo "_fw_$${FWSTR}_name:" >>$@;\
54 echo " .string \"$$FWNAME\"" >>$@;\
55 echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\
56 echo " .p2align $${ASM_ALIGN}" >>$@;\
57 echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\
58 echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\
59 echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@;
60
61# One of these files will change, or come into existence, whenever
62# the configuration changes between 32-bit and 64-bit. The .S files
63# need to change when that happens.
64wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
65 include/config/ppc32.h include/config/ppc64.h \
66 include/config/superh32.h include/config/superh64.h \
67 include/config/x86_32.h include/config/x86_64.h)
68
69# Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
70# It'll end up depending on these targets, so make them a PHONY rule which
71# depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
72PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%)
73$(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs)
74 @true
75
76# For the $$(dir %) trick, where we need % to be expanded first.
77.SECONDEXPANSION:
78
79$(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \
80 | $(objtree)/$$(dir %)
81 $(call cmd,fwbin,$(patsubst %.gen.S,%,$@))
82$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
83 include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %)
84 $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
85
86# The .o files depend on the binaries directly; the .S files don't.
87$(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
88$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
89
David Woodhouse8bd6b222008-05-31 15:07:18 +030090# .ihex is used just as a simple way to hold binary files in a source tree
91# where binaries are frowned upon. They are directly converted with objcopy.
David Woodhouse4d2acfb2008-05-23 13:58:12 +010092$(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
93 $(call cmd,ihex)
94
David Woodhouse8bd6b222008-05-31 15:07:18 +030095# .HEX is also Intel HEX, but where the offset and length in each record
96# is actually meaningful, because the firmware has to be loaded in a certain
97# order rather than as a single binary blob. Thus, we convert them into our
98# more compact binary representation of ihex records (<linux/ihex.h>)
99$(obj)/%.fw: $(obj)/%.HEX $(obj)/ihex2fw | $(objtree)/$(obj)/$$(dir %)
100 $(call cmd,ihex2fw)
101
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100102$(firmware-dirs):
103 $(call cmd,mkdir)
104
David Woodhouse88ecf812008-05-29 11:01:51 +0300105obj-y += $(patsubst %,%.gen.o, $(fw-external-y))
106obj-$(CONFIG_FIRMWARE_IN_KERNEL) += $(patsubst %,%.gen.o, $(fw-shipped-y))
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100107
108# Remove .S files and binaries created from ihex
109# (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
110targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
111 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
112
113# Without this, built-in.o won't be created when it's empty, and the
114# final vmlinux link will fail.
115obj-n := dummy
David Woodhouse8bd6b222008-05-31 15:07:18 +0300116
117hostprogs-y := ihex2fw