Commit graph

5 commits

Author SHA1 Message Date
Bin Meng
18aa5a4134 nvme: Get rid of the global variable nvme_info
At present the NVMe uclass driver uses a global variable nvme_info
to store global information like namespace id, and NVMe controller
driver's priv struct has a blk_dev_start that is used to calculate
the namespace id based on the global information from nvme_info.

This is not a good design in the DM world and can be replaced with
the following changes:

- Encode the namespace id in the NVMe block device name during
  the NVMe uclass post probe
- Extract the namespace id from the device name during the NVMe
  block device probe
- Let BLK uclass calculate the devnum for us by passing -1 to
  blk_create_devicef() as the devnum

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-08-28 07:17:14 -04:00
Bin Meng
b65c692143 nvme: Cache controller's capabilities
Capabilities register is RO and accessed at various places in the
driver. Let's cache it in the controller driver's priv struct.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-08-28 07:17:11 -04:00
Bin Meng
e5dc2d2665 nvme: Fix getting PCI vendor id of the NVMe block device
The codes currently try to read PCI vendor id of the NVMe block
device by dm_pci_read_config16() with its parameter set as its
root complex controller (ndev->pdev) instead of itself. This is
seriously wrong. We can read the vendor id by passing the correct
udevice parameter to the dm_pci_read_config16() API, however there
is a shortcut by reading the cached vendor id from the PCI device's
struct pci_child_platdata.

While we are here fixing this bug, apparently the quirk stuff handle
codes in nvme_get_info_from_identify() never takes effect since its
logic has never been true at all. Remove these codes completely.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-08-28 07:17:10 -04:00
Bin Meng
abe25db611 nvme: Remove useless defines
These are leftover when the driver was ported from Linux and are not
used by the U-Boot driver.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-08-28 07:17:10 -04:00
Zhikang Zhang
982388eaa9 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>
2017-08-13 15:17:31 -04:00