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Documentation: fpga: dfl: Add documentation for DFHv1 

Add documentation describing the extensions provided by Version
1 of the Device Feature Header (DFHv1).

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230115151447.1353428-2-matthew.gerlach@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthew Gerlach 2023-01-15 07:14:44 -08:00 committed by Greg Kroah-Hartman
parent 2d762dab66
commit 46879f7106
1 changed files with 119 additions and 0 deletions
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119
Documentation/fpga/dfl.rst
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@ -75,6 +75,125 @@ convenient for software to locate each feature by walking through this list,
and can be implemented in register regions of any FPGA device.
Device Feature Header - Version 0
=================================
Version 0 (DFHv0) is the original version of the Device Feature Header.
All multi-byte quantities in DFHv0 are little-endian.
The format of DFHv0 is shown below::
+-----------------------------------------------------------------------+
|63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 REV 12|11 ID 0| 0x00
+-----------------------------------------------------------------------+
|63 GUID_L 0| 0x08
+-----------------------------------------------------------------------+
|63 GUID_H 0| 0x10
+-----------------------------------------------------------------------+
- Offset 0x00
* Type - The type of DFH (e.g. FME, AFU, or private feature).
* DFH VER - The version of the DFH.
* Rsvd - Currently unused.
* EOL - Set if the DFH is the end of the Device Feature List (DFL).
* Next - The offset in bytes of the next DFH in the DFL from the DFH start,
and the start of a DFH must be aligned to an 8 byte boundary.
If EOL is set, Next is the size of MMIO of the last feature in the list.
* REV - The revision of the feature associated with this header.
* ID - The feature ID if Type is private feature.
- Offset 0x08
* GUID_L - Least significant 64 bits of a 128-bit Globally Unique Identifier
(present only if Type is FME or AFU).
- Offset 0x10
* GUID_H - Most significant 64 bits of a 128-bit Globally Unique Identifier
(present only if Type is FME or AFU).
Device Feature Header - Version 1
=================================
Version 1 (DFHv1) of the Device Feature Header adds the following functionality:
* Provides a standardized mechanism for features to describe
parameters/capabilities to software.
* Standardize the use of a GUID for all DFHv1 types.
* Decouples the DFH location from the register space of the feature itself.
All multi-byte quantities in DFHv1 are little-endian.
The format of Version 1 of the Device Feature Header (DFH) is shown below::
+-----------------------------------------------------------------------+
|63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 REV 12|11 ID 0| 0x00
+-----------------------------------------------------------------------+
|63 GUID_L 0| 0x08
+-----------------------------------------------------------------------+
|63 GUID_H 0| 0x10
+-----------------------------------------------------------------------+
|63 Reg Address/Offset 1| Rel 0| 0x18
+-----------------------------------------------------------------------+
|63 Reg Size 32|Params 31|30 Group 16|15 Instance 0| 0x20
+-----------------------------------------------------------------------+
|63 Next 35|34RSV33|EOP32|31 Param Version 16|15 Param ID 0| 0x28
+-----------------------------------------------------------------------+
|63 Parameter Data 0| 0x30
+-----------------------------------------------------------------------+
...
+-----------------------------------------------------------------------+
|63 Next 35|34RSV33|EOP32|31 Param Version 16|15 Param ID 0|
+-----------------------------------------------------------------------+
|63 Parameter Data 0|
+-----------------------------------------------------------------------+
- Offset 0x00
* Type - The type of DFH (e.g. FME, AFU, or private feature).
* DFH VER - The version of the DFH.
* Rsvd - Currently unused.
* EOL - Set if the DFH is the end of the Device Feature List (DFL).
* Next - The offset in bytes of the next DFH in the DFL from the DFH start,
and the start of a DFH must be aligned to an 8 byte boundary.
If EOL is set, Next is the size of MMIO of the last feature in the list.
* REV - The revision of the feature associated with this header.
* ID - The feature ID if Type is private feature.
- Offset 0x08
* GUID_L - Least significant 64 bits of a 128-bit Globally Unique Identifier.
- Offset 0x10
* GUID_H - Most significant 64 bits of a 128-bit Globally Unique Identifier.
- Offset 0x18
* Reg Address/Offset - If Rel bit is set, then the value is the high 63 bits
of a 16-bit aligned absolute address of the feature's registers. Otherwise
the value is the offset from the start of the DFH of the feature's registers.
- Offset 0x20
* Reg Size - Size of feature's register set in bytes.
* Params - Set if DFH has a list of parameter blocks.
* Group - Id of group if feature is part of a group.
* Instance - Id of feature instance within a group.
- Offset 0x28 if feature has parameters
* Next - Offset to the next parameter block in 8 byte words. If EOP set,
size in 8 byte words of last parameter.
* Param Version - Version of Param ID.
* Param ID - ID of parameter.
- Offset 0x30
* Parameter Data - Parameter data whose size and format is defined by
version and ID of the parameter.
FIU - FME (FPGA Management Engine)
==================================
The FPGA Management Engine performs reconfiguration and other infrastructure