nvme: Add NVM Express driver support
NVM Express (NVMe) is a register level interface that allows host
software to communicate with a non-volatile memory subsystem. This
interface is optimized for enterprise and client solid state drives,
typically attached to the PCI express interface.
This adds a U-Boot driver support of devices that follow the NVMe
standard [1] and supports basic read/write operations.
Tested with a 400GB Intel SSD 750 series NVMe card with controller
id 8086:0953.
[1] http://www.nvmexpress.org/resources/specifications/
Signed-off-by: Zhikang Zhang <zhikang.zhang@nxp.com>
Signed-off-by: Wenbin Song <wenbin.song@nxp.com>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/nvme/nvme-uclass.c b/drivers/nvme/nvme-uclass.c
new file mode 100644
index 0000000..0895bc9
--- /dev/null
+++ b/drivers/nvme/nvme-uclass.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2017 NXP Semiconductors
+ * Copyright (C) 2017 Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <dm/device.h>
+#include "nvme.h"
+
+static int nvme_info_init(struct uclass *uc)
+{
+ struct nvme_info *info = (struct nvme_info *)uc->priv;
+
+ info->ns_num = 0;
+ info->ndev_num = 0;
+ INIT_LIST_HEAD(&info->dev_list);
+ nvme_info = info;
+
+ return 0;
+}
+
+static int nvme_uclass_post_probe(struct udevice *udev)
+{
+ char name[20];
+ char *str;
+ struct udevice *ns_udev;
+ int i, ret;
+ struct nvme_dev *ndev = dev_get_priv(udev);
+
+ /* Create a blk device for each namespace */
+ for (i = 0; i < ndev->nn; i++) {
+ sprintf(name, "nvme-blk#%d", nvme_info->ns_num);
+ str = strdup(name);
+ if (!str)
+ return -ENOMEM;
+
+ /* The real blksz and size will be set by nvme_blk_probe() */
+ ret = blk_create_device(udev, "nvme-blk", str, IF_TYPE_NVME,
+ nvme_info->ns_num++, 512, 0, &ns_udev);
+ if (ret) {
+ free(str);
+ nvme_info->ns_num--;
+
+ return ret;
+ }
+ device_set_name_alloced(ns_udev);
+ }
+
+ return 0;
+}
+
+UCLASS_DRIVER(nvme) = {
+ .name = "nvme",
+ .id = UCLASS_NVME,
+ .init = nvme_info_init,
+ .post_probe = nvme_uclass_post_probe,
+ .priv_auto_alloc_size = sizeof(struct nvme_info),
+};