boot: Introduce support for U-Boot support for Airoha EN7581/AN7583

Introduce support for U-Boot for Airoha EN7581/AN7583. For EN7581
initial patch are already in U-Boot mainline and doesn't require
backport, for AN7583 some patch are still pending but already posted
upstream.

Also add for now, precompiled binary for ATF BL2 and BL31. Support for
ATF is planned and will come later.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
(cherry picked from commit 04f6769)

Author: Ansuel

package/boot/uboot-airoha/Makefile

@@ -0,0 +1,95 @@
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_VERSION:=2025.07
+PKG_HASH:=0f933f6c5a426895bf306e93e6ac53c60870e4b54cda56d95211bec99e63bec7
+PKG_BUILD_DEPENDS:=arm-trusted-firmware-tools/host
+
+UBOOT_USE_INTREE_DTC:=1
+
+include $(INCLUDE_DIR)/u-boot.mk
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
+
+define U-Boot/Default
+  BUILD_TARGET:=airoha
+  HIDDEN:=1
+  FIP_COMPRESS:=1
+endef
+
+define U-Boot/an7581_rfb
+  NAME:=AN7581 Reference Board
+  UBOOT_CONFIG:=an7581_evb
+  BUILD_DEVICES:=airoha_an7581-evb
+  BUILD_SUBTARGET:=an7581
+  UBOOT_IMAGE:=u-boot.fip
+  BL2_IMAGE:=an7581-bl2.bin
+  BL31_IMAGE:=an7581-bl31.bin
+endef
+
+define U-Boot/an7583_rfb
+  NAME:=AN7583 Reference Board
+  UBOOT_CONFIG:=an7583_evb
+  BUILD_DEVICES:=airoha_an7583-evb
+  BUILD_SUBTARGET:=an7583
+  UBOOT_IMAGE:=u-boot.fip
+  BL2_IMAGE:=an7583-bl2.bin
+  BL31_IMAGE:=an7583-bl31.bin
+endef
+
+UBOOT_TARGETS := \
+	an7581_rfb \
+	an7583_rfb
+
+UBOOT_CUSTOMIZE_CONFIG := \
+	--disable TOOLS_KWBIMAGE \
+	--disable TOOLS_LIBCRYPTO \
+	--disable TOOLS_MKEFICAPSULE \
+	--enable SERIAL_RX_BUFFER \
+	--set-val SERIAL_RX_BUFFER_SIZE 256
+
+define Build/fip-image-bl2
+	$(STAGING_DIR_HOST)/bin/fiptool create \
+		--tb-fw files/$(BL2_IMAGE) \
+		$(PKG_BUILD_DIR)/bl2.fip
+endef
+
+define Build/fip-image
+	$(if $(FIP_COMPRESS), $(STAGING_DIR_HOST)/bin/lzma e \
+		$(PKG_BUILD_DIR)/u-boot.bin \
+		$(PKG_BUILD_DIR)/u-boot.bin.lzma)
+	$(if $(FIP_COMPRESS), $(STAGING_DIR_HOST)/bin/lzma e \
+		files/$(BL31_IMAGE) \
+		$(PKG_BUILD_DIR)/bl31.bin.lzma)
+	$(STAGING_DIR_HOST)/bin/fiptool create \
+		--soc-fw $(PKG_BUILD_DIR)/bl31.bin$(if $(FIP_COMPRESS),.lzma) \
+		--nt-fw $(PKG_BUILD_DIR)/u-boot.bin$(if $(FIP_COMPRESS),.lzma) \
+		$(PKG_BUILD_DIR)/u-boot.fip
+endef
+
+define Build/Configure
+	$(call Build/Configure/U-Boot)
+	sed -i 's/CONFIG_TOOLS_LIBCRYPTO=y/# CONFIG_TOOLS_LIBCRYPTO is not set/' $(PKG_BUILD_DIR)/.config
+endef
+
+define Build/Compile
+	$(call Build/Compile/U-Boot)
+ifeq ($(UBOOT_IMAGE),u-boot.fip)
+	$(call Build/fip-image-bl2)
+	$(call Build/fip-image)
+endif
+endef
+
+# don't stage files to bindir, let target/linux/airoha/image/*.mk do that
+define Package/u-boot/install
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(STAGING_DIR_IMAGE)
+ifeq ($(UBOOT_IMAGE),u-boot.fip)
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/bl2.fip $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-bl2.fip
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/u-boot.fip $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-bl31-u-boot.fip
+endif
+endef
+
+$(eval $(call BuildPackage/U-Boot))

package/boot/uboot-airoha/files/an7581-bl2.bin

@@ -0,0 +1,55 @@
+From 4f1fcf5281ee4e22b1e89a62bd0417878bcbeca5 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Tue, 3 Jun 2025 10:41:18 +0200
+Subject: [PATCH 1/2] linux/bitfield.h: import FIELD_PREP_CONST macro from
+ Linux Kernel
+
+Import FIELD_PREP_CONST macro from Linux Kernel to permit usage of
+FIELD_PREP with scenario where a constant value is needed.
+
+Refer to commit e2192de59e45 ("bitfield: add FIELD_PREP_CONST()") in
+Linux kernel for extensive explaination of why this is useful.
+
+This is also to better align with the Linux Kernel for easier porting of
+driver.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ include/linux/bitfield.h | 26 ++++++++++++++++++++++++++
+ 1 file changed, 26 insertions(+)
+
+--- a/include/linux/bitfield.h
++++ b/include/linux/bitfield.h
+@@ -90,6 +90,32 @@
+ 		((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);	\
+ 	})
+ 
++#define __BF_CHECK_POW2(n)	BUILD_BUG_ON_ZERO(((n) & ((n) - 1)) != 0)
++
++/**
++ * FIELD_PREP_CONST() - prepare a constant bitfield element
++ * @_mask: shifted mask defining the field's length and position
++ * @_val:  value to put in the field
++ *
++ * FIELD_PREP_CONST() masks and shifts up the value.  The result should
++ * be combined with other fields of the bitfield using logical OR.
++ *
++ * Unlike FIELD_PREP() this is a constant expression and can therefore
++ * be used in initializers. Error checking is less comfortable for this
++ * version, and non-constant masks cannot be used.
++ */
++#define FIELD_PREP_CONST(_mask, _val)					\
++	(								\
++		/* mask must be non-zero */				\
++		BUILD_BUG_ON_ZERO((_mask) == 0) +			\
++		/* check if value fits */				\
++		BUILD_BUG_ON_ZERO(~((_mask) >> __bf_shf(_mask)) & (_val)) + \
++		/* check if mask is contiguous */			\
++		__BF_CHECK_POW2((_mask) + (1ULL << __bf_shf(_mask))) +	\
++		/* and create the value */				\
++		(((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask))	\
++	)
++
+ /**
+  * FIELD_GET() - extract a bitfield element
+  * @_mask: shifted mask defining the field's length and position

package/boot/uboot-airoha/files/an7581-bl31.bin

@@ -0,0 +1,56 @@
+From 00e8038b8be74d599f7bc8078731cc2505832f57 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Tue, 3 Jun 2025 10:47:15 +0200
+Subject: [PATCH 2/2] mtd: spinand: winbond: add Winbond W25N04KV flash support
+
+Add Winbond W25N04KV flash support that use a different value to detect
+ECC bitflip.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ drivers/mtd/nand/spi/winbond.c | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+--- a/drivers/mtd/nand/spi/winbond.c
++++ b/drivers/mtd/nand/spi/winbond.c
+@@ -11,6 +11,7 @@
+ #include <linux/device.h>
+ #include <linux/kernel.h>
+ #endif
++#include <linux/bitfield.h>
+ #include <linux/bug.h>
+ #include <linux/mtd/spinand.h>
+ 
+@@ -18,6 +19,8 @@
+ 
+ #define WINBOND_CFG_BUF_READ		BIT(3)
+ 
++#define W25N04KV_STATUS_ECC_5_8_BITFLIPS FIELD_PREP_CONST(STATUS_ECC_MASK, 0x3)
++
+ static SPINAND_OP_VARIANTS(read_cache_variants,
+ 		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
+ 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
+@@ -121,6 +124,7 @@ static int w25n02kv_ecc_get_status(struc
+ 		return -EBADMSG;
+ 
+ 	case STATUS_ECC_HAS_BITFLIPS:
++	case W25N04KV_STATUS_ECC_5_8_BITFLIPS:
+ 		/*
+ 		 * Let's try to retrieve the real maximum number of bitflips
+ 		 * in order to avoid forcing the wear-leveling layer to move
+@@ -169,6 +173,15 @@ static const struct spinand_info winbond
+ 		     NAND_ECCREQ(8, 512),
+ 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
+ 					      &write_cache_variants,
++					      &update_cache_variants),
++		     0,
++		     SPINAND_ECCINFO(&w25n02kv_ooblayout, w25n02kv_ecc_get_status)),
++	SPINAND_INFO("W25N04KV",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa, 0x23),
++		     NAND_MEMORG(1, 2048, 128, 64, 4096, 40, 2, 1, 1),
++		     NAND_ECCREQ(8, 512),
++		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
++					      &write_cache_variants,
+ 					      &update_cache_variants),
+ 		     0,
+ 		     SPINAND_ECCINFO(&w25n02kv_ooblayout, w25n02kv_ecc_get_status)),