firmware/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # kbuild file for firmware/
   4 #
   5
   6 CONFIG_EXTRA_FIRMWARE_DIR="firmware"
   7
   8 # Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
   9 # leading /, it's relative to $(srctree).
  10 fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR))
  11 fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
  12
  13 fw-external-y := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE))
  14
  15 fw-external-$(CONFIG_EXYNOS9610_ACPM) += exynos9610_acpm_fvp.fw
  16 fw-external-$(CONFIG_EXYNOS9610_ACPM) += exynos9610_acpm_tmu.fw
  17
  18 quiet_cmd_ihex  = IHEX    $@
  19       cmd_ihex  = $(OBJCOPY) -Iihex -Obinary $< $@
  20
  21 quiet_cmd_ihex2fw  = IHEX2FW $@
  22       cmd_ihex2fw  = $(objtree)/$(obj)/ihex2fw $< $@
  23
  24 quiet_cmd_h16tofw  = H16TOFW $@
  25       cmd_h16tofw  = $(objtree)/$(obj)/ihex2fw -w $< $@
  26
  27 quiet_cmd_fwbin = MK_FW   $@
  28       cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)";                \
  29                   FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst      \
  30                                 firmware/%.gen.S,%,$@))))";                  \
  31                   ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long);                \
  32                   ASM_ALIGN=$(if $(CONFIG_64BIT),3,2);                       \
  33                   PROGBITS=$(if $(CONFIG_ARM),%,@)progbits;                  \
  34                   echo "/* Generated by firmware/Makefile */"           > $@;\
  35                   echo "    .section .rodata"                           >>$@;\
  36                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  37                   echo "_fw_$${FWSTR}_bin:"                             >>$@;\
  38                   echo "    .incbin \"$(2)\""                           >>$@;\
  39                   echo "_fw_end:"                                       >>$@;\
  40                   echo "   .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
  41                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  42                   echo "_fw_$${FWSTR}_name:"                            >>$@;\
  43                   echo "    .string \"$$FWNAME\""                       >>$@;\
  44                   echo "    .section .builtin_fw,\"a\",$${PROGBITS}"    >>$@;\
  45                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  46                   echo "    $${ASM_WORD} _fw_$${FWSTR}_name"            >>$@;\
  47                   echo "    $${ASM_WORD} _fw_$${FWSTR}_bin"             >>$@;\
  48                   echo "    $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin"   >>$@;
  49
  50 # One of these files will change, or come into existence, whenever
  51 # the configuration changes between 32-bit and 64-bit. The .S files
  52 # need to change when that happens.
  53 wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
  54                 include/config/ppc32.h include/config/ppc64.h \
  55                 include/config/superh32.h include/config/superh64.h \
  56                 include/config/x86_32.h include/config/x86_64.h \
  57                 firmware/Makefile)
  58
  59 $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps)
  60         $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
  61
  62 # The .o files depend on the binaries directly; the .S files don't.
  63 $(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
  64
  65 # .ihex is used just as a simple way to hold binary files in a source tree
  66 # where binaries are frowned upon. They are directly converted with objcopy.
  67 $(obj)/%: $(obj)/%.ihex
  68         $(call cmd,ihex)
  69
  70 obj-y                            += $(patsubst %,%.gen.o, $(fw-external-y))
  71
  72 ifeq ($(KBUILD_SRC),)
  73 # Makefile.build only creates subdirectories for O= builds, but external
  74 # firmware might live outside the kernel source tree
  75 _dummy := $(foreach d,$(addprefix $(obj)/,$(dir $(fw-external-y))), $(shell [ -d $(d) ] || mkdir -p $(d)))
  76 endif
  77
  78 targets := $(patsubst $(obj)/%,%, \
  79                                 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
  80 # Without this, built-in.o won't be created when it's empty, and the
  81 # final vmlinux link will fail.
  82 obj- := dummy