Merge patch series "Enable env in SCSI"

Varadarajan Narayanan <quic_varada@quicinc.com> says:

The qcs9100 based Ride platforms have UFS as their primary storage.
Hence add support to U-Boot env framework to be able to save and
retrieve the environment from UFS. The environment will be
saved/retrieved from the partition specified in the config option
CONFIG_SCSI_ENV_PART.

Also add an API to convert partition UUID string to block device
descriptor for UFS. This API will be used to get the block device
descriptor for the partition specified in CONFIG_SCSI_ENV_PART.

Link: https://lore.kernel.org/r/20250513091710.3719292-1-quic_varada@quicinc.com

4 files changed, 133 insertions, 1 deletions

diff --git a/env/Kconfig b/env/Kconfig
index d7a7e81144b..8203ef73fce 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -74,7 +74,7 @@ config ENV_IS_DEFAULT
 		     !ENV_IS_IN_MMC && !ENV_IS_IN_NAND && \
 		     !ENV_IS_IN_NVRAM && !ENV_IS_IN_ONENAND && \
 		     !ENV_IS_IN_REMOTE && !ENV_IS_IN_SPI_FLASH && \
-		     !ENV_IS_IN_UBI && !ENV_IS_IN_MTD
+		     !ENV_IS_IN_UBI && !ENV_IS_IN_MTD && !ENV_IS_IN_SCSI
 	select ENV_IS_NOWHERE
 
 config ENV_IS_NOWHERE
@@ -297,6 +297,13 @@ config ENV_IS_IN_NAND
 	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
 	  using CONFIG_ENV_OFFSET_OOB.
 
+config ENV_IS_IN_SCSI
+	bool "Environment in an SCSI device"
+	depends on SCSI
+	help
+	  Define this if you have an SCSI device which you want to use for the
+	  environment.
+
 config ENV_RANGE
 	hex "Length of the region in which the environment can be written"
 	depends on ENV_IS_IN_NAND
@@ -731,6 +738,12 @@ config ENV_MMC_USE_DT
 	  The 2 defines CONFIG_ENV_OFFSET, CONFIG_ENV_OFFSET_REDUND
 	  are not used as fallback.
 
+config SCSI_ENV_PART_UUID
+	string "SCSI partition UUID for saving environment"
+	depends on ENV_IS_IN_SCSI
+	help
+	  UUID of the SCSI partition that you want to store the environment in.
+
 config USE_DEFAULT_ENV_FILE
 	bool "Create default environment from file"
 	help
diff --git a/env/Makefile b/env/Makefile
index 3b9c71d5681..d11b87702c1 100644
--- a/env/Makefile
+++ b/env/Makefile
@@ -28,5 +28,6 @@ obj-$(CONFIG_$(PHASE_)ENV_IS_IN_NAND) += nand.o
 obj-$(CONFIG_$(PHASE_)ENV_IS_IN_SPI_FLASH) += sf.o
 obj-$(CONFIG_$(PHASE_)ENV_IS_IN_MTD) += mtd.o
 obj-$(CONFIG_$(PHASE_)ENV_IS_IN_FLASH) += flash.o
+obj-$(CONFIG_$(PHASE_)ENV_IS_IN_SCSI) += scsi.o
 
 CFLAGS_embedded.o := -Wa,--no-warn -DENV_CRC=$(shell tools/envcrc 2>/dev/null)
diff --git a/env/env.c b/env/env.c
index dbaeedc3c3b..7a9c96b4078 100644
--- a/env/env.c
+++ b/env/env.c
@@ -46,6 +46,9 @@ static enum env_location env_locations[] = {
 #ifdef CONFIG_ENV_IS_IN_MMC
 	ENVL_MMC,
 #endif
+#ifdef CONFIG_ENV_IS_IN_SCSI
+	ENVL_SCSI,
+#endif
 #ifdef CONFIG_ENV_IS_IN_NAND
 	ENVL_NAND,
 #endif
diff --git a/env/scsi.c b/env/scsi.c
new file mode 100644
index 00000000000..207717e17b1
--- /dev/null
+++ b/env/scsi.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
+ */
+
+/* #define DEBUG */
+
+#include <asm/global_data.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <fdtdec.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <part.h>
+#include <search.h>
+#include <scsi.h>
+#include <errno.h>
+#include <dm/ofnode.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+static env_t envbuf;
+
+struct env_scsi_info {
+	struct blk_desc *blk;
+	struct disk_partition part;
+	int count;
+};
+
+static struct env_scsi_info env_part;
+
+static inline struct env_scsi_info *env_scsi_get_part(void)
+{
+	struct env_scsi_info *ep = &env_part;
+
+	if (scsi_get_blk_by_uuid(CONFIG_SCSI_ENV_PART_UUID, &ep->blk, &ep->part))
+		return NULL;
+
+	ep->count = CONFIG_ENV_SIZE / ep->part.blksz;
+
+	return ep;
+}
+
+static int env_scsi_save(void)
+{
+	struct env_scsi_info *ep = env_scsi_get_part();
+	int ret;
+
+	if (!ep)
+		return -ENOENT;
+
+	ret = env_export(&envbuf);
+	if (ret)
+		return ret;
+
+	if (blk_dwrite(ep->blk, ep->part.start, ep->count, &envbuf) != ep->count)
+		return -EIO;
+
+	return 0;
+}
+
+static int env_scsi_erase(void)
+{
+	struct env_scsi_info *ep = env_scsi_get_part();
+
+	if (!ep)
+		return -ENOENT;
+
+	return (int)blk_derase(ep->blk, ep->part.start, ep->count);
+}
+
+#if defined(ENV_IS_EMBEDDED)
+static int env_scsi_load(void)
+{
+	return 0;
+}
+#else
+static int env_scsi_load(void)
+{
+	struct env_scsi_info *ep = env_scsi_get_part();
+	int ret;
+
+	if (!ep) {
+		env_set_default(CONFIG_SCSI_ENV_PART_UUID " partition not found", 0);
+		return -ENOENT;
+	}
+
+	if (blk_dread(ep->blk, ep->part.start, ep->count, &envbuf) != ep->count) {
+		env_set_default(CONFIG_SCSI_ENV_PART_UUID " partition read failed", 0);
+		return -EIO;
+	}
+
+	ret = env_import((char *)&envbuf, 1, H_EXTERNAL);
+	if (ret) {
+		debug("ENV import failed\n");
+		env_set_default("Cannot load environment", 0);
+	} else {
+		gd->env_addr = (ulong)envbuf.data;
+	}
+
+	return ret;
+}
+#endif
+
+U_BOOT_ENV_LOCATION(scsi) = {
+	.location	= ENVL_SCSI,
+	ENV_NAME("SCSI")
+	.load		= env_scsi_load,
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_XPL_BUILD)
+	.save		= env_save_ptr(env_scsi_save),
+	.erase		= ENV_ERASE_PTR(env_scsi_erase),
+#endif
+};