[PATCH v3 36/38] Add builtin firmware support

From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v3 36/38] Add builtin firmware support
Date: Wed,  6 Jun 2018 11:44:29 -0700	[thread overview]
Message-ID: <20180606184431.10348-37-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20180606184431.10348-1-andrew.smirnov@gmail.com>

From: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
[andrew.smirnov@gmail.com: Add dummy.o in case directory is empty]
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 Makefile           |  2 +-
 arch/arm/Kconfig   |  1 +
 firmware/Kconfig   |  7 ++++++
 firmware/Makefile  | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 include/firmware.h |  8 +++++++
 5 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 firmware/Kconfig
 create mode 100644 firmware/Makefile

diff --git a/Makefile b/Makefile
index 88c199173..b335f2054 100644
--- a/Makefile
+++ b/Makefile
@@ -426,7 +426,7 @@ scripts: scripts_basic include/config/auto.conf
 	$(Q)$(MAKE) $(build)=$(@)
 
 # Objects we will link into barebox / subdirs we need to visit
-common-y		:= common/ drivers/ commands/ lib/ crypto/ net/ fs/
+common-y		:= common/ drivers/ commands/ lib/ crypto/ net/ fs/ firmware/
 
 ifeq ($(dot-config),1)
 # Read in config
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 37cde0c0c..bd736284f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -414,3 +414,4 @@ source drivers/Kconfig
 source fs/Kconfig
 source lib/Kconfig
 source crypto/Kconfig
+source firmware/Kconfig
diff --git a/firmware/Kconfig b/firmware/Kconfig
new file mode 100644
index 000000000..e0cc7abef
--- /dev/null
+++ b/firmware/Kconfig
@@ -0,0 +1,7 @@
+menu "Firmware files"
+
+config EXTRA_FIRMWARE_DIR
+	string "Firmware blobs root directory"
+	default "firmware"
+
+endmenu
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100644
index 000000000..b4074ca4f
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# kbuild file for firmware/
+#
+
+# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
+# leading /, it's relative to $(srctree).
+fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR))
+fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
+
+fw-external-y := $(firmware-y)
+
+quiet_cmd_fwbin = MK_FW   $@
+      cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)";		     \
+		  FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst	     \
+				firmware/%.gen.S,%,$@))))";		     \
+		  ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long);		     \
+		  ASM_ALIGN=$(if $(CONFIG_64BIT),3,2);			     \
+		  PROGBITS=$(if $(CONFIG_ARM),%,@)progbits;		     \
+		  echo "/* Generated by firmware/Makefile */"		> $@;\
+		  echo "    .section .rodata.$${FWSTR}"			>>$@;\
+		  echo "    .p2align $${ASM_ALIGN}"			>>$@;\
+		  echo ".global _fw_$${FWSTR}_start"			>>$@;\
+		  echo "_fw_$${FWSTR}_start:"				>>$@;\
+		  echo "    .incbin \"$(2)\""				>>$@;\
+		  echo ".global _fw_$${FWSTR}_end"			>>$@;\
+		  echo "_fw_$${FWSTR}_end:"				>>$@;
+
+# One of these files will change, or come into existence, whenever
+# the configuration changes between 32-bit and 64-bit. The .S files
+# need to change when that happens.
+wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h)
+
+$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
+		include/config/extra/firmware/dir.h
+	$(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
+
+# The .o files depend on the binaries directly; the .S files don't.
+$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
+
+obj-pbl-y			 += $(patsubst %,%.gen.o, $(fw-external-y))
+
+ifeq ($(KBUILD_SRC),)
+# Makefile.build only creates subdirectories for O= builds, but external
+# firmware might live outside the kernel source tree
+_dummy := $(foreach d,$(addprefix $(obj)/,$(dir $(fw-external-y))), $(shell [ -d $(d) ] || mkdir -p $(d)))
+endif
+
+targets := $(patsubst $(obj)/%,%, \
+                                $(shell find $(obj) -name \*.gen.S 2>/dev/null))
+
+# just to build a built-in.o. Otherwise compilation fails when no devicetree is
+# created.
+obj- += dummy.o
+
diff --git a/include/firmware.h b/include/firmware.h
index f6f78c840..284e0f970 100644
--- a/include/firmware.h
+++ b/include/firmware.h
@@ -39,4 +39,12 @@ void firmwaremgr_list_handlers(void);
 
 int firmwaremgr_load_file(struct firmware_mgr *, const char *path);
 
+#define get_builtin_firmware(name, start, size) \
+	{							\
+		extern char _fw_##name##_start[];		\
+		extern char _fw_##name##_end[];			\
+		*start = (typeof(*start)) _fw_##name##_start;	\
+		*size = _fw_##name##_end - _fw_##name##_start;	\
+	}
+
 #endif /* FIRMWARE_H */
-- 
2.17.0


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