[PATCH v2 4/4] common: spl: Add spl NVMe boot support

[Mayuresh Chitale <mchitale@ventanamicro.com>]

Add support to load the next stage image from an NVMe disk which may
be formatted as an EXT or FAT filesystem.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 arch/riscv/include/asm/spl.h |  1 +
 common/spl/Kconfig           | 10 +++++++
 common/spl/Makefile          |  1 +
 common/spl/spl_nvme.c        | 52 ++++++++++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 common/spl/spl_nvme.c

diff --git a/arch/riscv/include/asm/spl.h b/arch/riscv/include/asm/spl.h
index 2898a770ee..9c0bf9755c 100644
--- a/arch/riscv/include/asm/spl.h
+++ b/arch/riscv/include/asm/spl.h
@@ -20,6 +20,7 @@ enum {
 	BOOT_DEVICE_SPI,
 	BOOT_DEVICE_USB,
 	BOOT_DEVICE_SATA,
+	BOOT_DEVICE_NVME,
 	BOOT_DEVICE_I2C,
 	BOOT_DEVICE_BOARD,
 	BOOT_DEVICE_DFU,
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index a42774c76d..021c4997a7 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1283,6 +1283,16 @@ config SPL_NVME_BOOT_DEVICE
 	depends on SPL_NVME
 	default 0x0
 
+config SYS_NVME_EXT_BOOT_PARTITION
+	hex "NVMe ext boot partition number"
+	depends on SPL_NVME
+	default	0x2
+
+config SYS_NVME_FAT_BOOT_PARTITION
+	hex "NVMe boot partition number"
+	depends on SPL_NVME
+	default	0x1
+
 config SPL_SERIAL
 	bool "Support serial"
 	select SPL_PRINTF
diff --git a/common/spl/Makefile b/common/spl/Makefile
index 13db3df993..4bcc3d7e68 100644
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_$(SPL_TPL_)USB_STORAGE) += spl_usb.o
 obj-$(CONFIG_$(SPL_TPL_)FS_FAT) += spl_fat.o
 obj-$(CONFIG_$(SPL_TPL_)FS_EXT4) += spl_ext.o
 obj-$(CONFIG_$(SPL_TPL_)SATA) += spl_sata.o
+obj-$(CONFIG_$(SPL_TPL_)NVME) += spl_nvme.o
 obj-$(CONFIG_$(SPL_TPL_)SEMIHOSTING) += spl_semihosting.o
 obj-$(CONFIG_$(SPL_TPL_)DFU) += spl_dfu.o
 obj-$(CONFIG_$(SPL_TPL_)SPI_LOAD) += spl_spi.o
diff --git a/common/spl/spl_nvme.c b/common/spl/spl_nvme.c
new file mode 100644
index 0000000000..c99e0aefc7
--- /dev/null
+++ b/common/spl/spl_nvme.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023
+ * Ventana Micro Systems Inc.
+ *
+ * Derived work from spl_sata.c
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <errno.h>
+#include <fat.h>
+#include <init.h>
+#include <nvme.h>
+
+static int spl_nvme_load_image(struct spl_image_info *spl_image,
+			       struct spl_boot_device *bootdev)
+{
+	int ret;
+	struct blk_desc *blk_desc;
+
+	ret = pci_init();
+	if (ret < 0)
+		goto out;
+
+	ret = nvme_scan_namespace();
+	if (ret < 0)
+		goto out;
+
+	blk_show_device(UCLASS_NVME, CONFIG_SPL_NVME_BOOT_DEVICE);
+	blk_desc = blk_get_devnum_by_uclass_id(UCLASS_NVME,
+					       CONFIG_SPL_NVME_BOOT_DEVICE);
+	if (IS_ENABLED(CONFIG_SPL_FS_EXT4)) {
+		ret = spl_load_image_ext(spl_image, bootdev, blk_desc,
+					 CONFIG_SYS_NVME_EXT_BOOT_PARTITION,
+					 CONFIG_SPL_PAYLOAD);
+		if (!ret)
+			return ret;
+	}
+
+	if (IS_ENABLED(CONFIG_SPL_FS_FAT))
+		ret = spl_load_image_fat(spl_image, bootdev, blk_desc,
+					 CONFIG_SYS_NVME_FAT_BOOT_PARTITION,
+					 CONFIG_SPL_PAYLOAD);
+	else
+		ret = -ENOSYS;
+
+out:
+	return ret;
+}
+
+SPL_LOAD_IMAGE_METHOD("NVME", 0, BOOT_DEVICE_NVME, spl_nvme_load_image);
-- 
2.34.1