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>

1 files changed, 71 insertions, 0 deletions

diff --git a/include/nvme.h b/include/nvme.h
new file mode 100644
index 0000000..3624408
--- /dev/null
+++ b/include/nvme.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2017 NXP Semiconductors
+ * Copyright (C) 2017 Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __NVME_H__
+#define __NVME_H__
+
+struct nvme_dev;
+
+/**
+ * nvme_identify - identify controller or namespace capabilities and status
+ *
+ * This issues an identify command to the NVMe controller to return a data
+ * buffer that describes the controller or namespace capabilities and status.
+ *
+ * @dev:	NVMe controller device
+ * @nsid:	0 for controller, namespace id for namespace to identify
+ * @cns:	1 for controller, 0 for namespace
+ * @dma_addr:	dma buffer address to store the identify result
+ * @return:	0 on success, -ETIMEDOUT on command execution timeout,
+ *		-EIO on command execution fails
+ */
+int nvme_identify(struct nvme_dev *dev, unsigned nsid,
+		  unsigned cns, dma_addr_t dma_addr);
+
+/**
+ * nvme_get_features - retrieve the attributes of the feature specified
+ *
+ * This retrieves the attributes of the feature specified.
+ *
+ * @dev:	NVMe controller device
+ * @fid:	feature id to provide data
+ * @nsid:	namespace id the command applies to
+ * @dma_addr:	data structure used as part of the specified feature
+ * @result:	command-specific result in the completion queue entry
+ * @return:	0 on success, -ETIMEDOUT on command execution timeout,
+ *		-EIO on command execution fails
+ */
+int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
+		      dma_addr_t dma_addr, u32 *result);
+
+/**
+ * nvme_set_features - specify the attributes of the feature indicated
+ *
+ * This specifies the attributes of the feature indicated.
+ *
+ * @dev:	NVMe controller device
+ * @fid:	feature id to provide data
+ * @dword11:	command-specific input parameter
+ * @dma_addr:	data structure used as part of the specified feature
+ * @result:	command-specific result in the completion queue entry
+ * @return:	0 on success, -ETIMEDOUT on command execution timeout,
+ *		-EIO on command execution fails
+ */
+int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
+		      dma_addr_t dma_addr, u32 *result);
+
+/**
+ * nvme_scan_namespace - scan all namespaces attached to NVMe controllers
+ *
+ * This probes all registered NVMe uclass device drivers in the system,
+ * and tries to find all namespaces attached to the NVMe controllers.
+ *
+ * @return:	0 on success, -ve on error
+ */
+int nvme_scan_namespace(void);
+
+#endif /* __NVME_H__ */