[RFC PATCH v1 3/3] common: spl: Add spl NVMe boot support

[Mayuresh Chitale <mchitale@ventanamicro.com>]

Add spl_nvme to read a fat partition from a bootable NVMe device.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 arch/riscv/include/asm/spl.h |  1 +
 common/spl/Makefile          |  1 +
 common/spl/spl_nvme.c        | 44 ++++++++++++++++++++++++++++++++++++
 3 files changed, 46 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 e8a94fcb1f..5d0ba4b034 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/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..d8a9dba845
--- /dev/null
+++ b/common/spl/spl_nvme.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022
+ * Ventana Micro Systems Inc.
+ *
+ * Derived work from spl_sata.c
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <errno.h>
+#include <fat.h>
+#include <nvme.h>
+#include <init.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(IF_TYPE_NVME, CONFIG_SPL_NVME_BOOT_DEVICE);
+	blk_desc = blk_get_devnum_by_type(IF_TYPE_NVME,
+					  CONFIG_SPL_NVME_BOOT_DEVICE);
+	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);
-- 
2.25.1