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docs: fpga: document programming fpgas using regions

Browse Source 
Clarify the intention that interfaces and upper layers use
regions rather than managers directly.

Rearrange API documentation to better group the API functions
used to create FPGA mgr/bridge/regions and the API used for
programming FPGAs.

Signed-off-by: Alan Tull <atull@kernel.org>
Suggested-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Tull 2018-10-15 17:20:04 -05:00 committed by Greg Kroah-Hartman
parent fea82b7f66
commit 4a6ff3c9a6
6 changed files with 171 additions and 187 deletions
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38
Documentation/driver-api/fpga/fpga-bridge.rst
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@ -4,6 +4,12 @@ FPGA Bridge
API to implement a new FPGA bridge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* struct :c:type:`fpga_bridge` — The FPGA Bridge structure
* struct :c:type:`fpga_bridge_ops` — Low level Bridge driver ops
* :c:func:`devm_fpga_bridge_create()` — Allocate and init a bridge struct
* :c:func:`fpga_bridge_register()` — Register a bridge
* :c:func:`fpga_bridge_unregister()` — Unregister a bridge
.. kernel-doc:: include/linux/fpga/fpga-bridge.h
:functions: fpga_bridge
@ -13,40 +19,8 @@ API to implement a new FPGA bridge
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: devm_fpga_bridge_create
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_create
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_free
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_register
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_unregister
API to control an FPGA bridge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You probably won't need these directly. FPGA regions should handle this.
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: of_fpga_bridge_get
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_get
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_put
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_get_to_list
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: of_fpga_bridge_get_to_list
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_enable
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_disable

117
Documentation/driver-api/fpga/fpga-mgr.rst
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@ -98,67 +98,19 @@ The ops include a .state function which will determine the state the FPGA is in
and return a code of type enum fpga_mgr_states. It doesn't result in a change
in state.
How to write an image buffer to a supported FPGA
------------------------------------------------
Some sample code::
#include <linux/fpga/fpga-mgr.h>
struct fpga_manager *mgr;
struct fpga_image_info *info;
int ret;
/*
* Get a reference to FPGA manager. The manager is not locked, so you can
* hold onto this reference without it preventing programming.
*
* This example uses the device node of the manager. Alternatively, use
* fpga_mgr_get(dev) instead if you have the device.
*/
mgr = of_fpga_mgr_get(mgr_node);
/* struct with information about the FPGA image to program. */
info = fpga_image_info_alloc(dev);
/* flags indicates whether to do full or partial reconfiguration */
info->flags = FPGA_MGR_PARTIAL_RECONFIG;
/*
* At this point, indicate where the image is. This is pseudo-code; you're
* going to use one of these three.
*/
if (image is in a scatter gather table) {
info->sgt = [your scatter gather table]
} else if (image is in a buffer) {
info->buf = [your image buffer]
info->count = [image buffer size]
} else if (image is in a firmware file) {
info->firmware_name = devm_kstrdup(dev, firmware_name, GFP_KERNEL);
}
/* Get exclusive control of FPGA manager */
ret = fpga_mgr_lock(mgr);
/* Load the buffer to the FPGA */
ret = fpga_mgr_buf_load(mgr, &info, buf, count);
/* Release the FPGA manager */
fpga_mgr_unlock(mgr);
fpga_mgr_put(mgr);
/* Deallocate the image info if you're done with it */
fpga_image_info_free(info);
API for implementing a new FPGA Manager driver
----------------------------------------------
* ``fpga_mgr_states`` — Values for :c:member:`fpga_manager->state`.
* struct :c:type:`fpga_manager` — the FPGA manager struct
* struct :c:type:`fpga_manager_ops` — Low level FPGA manager driver ops
* :c:func:`devm_fpga_mgr_create` — Allocate and init a manager struct
* :c:func:`fpga_mgr_register` — Register an FPGA manager
* :c:func:`fpga_mgr_unregister` — Unregister an FPGA manager
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_mgr_states
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_manager
@ -168,57 +120,8 @@ API for implementing a new FPGA Manager driver
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: devm_fpga_mgr_create
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_create
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_free
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_register
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_unregister
API for programming an FPGA
---------------------------
FPGA Manager flags
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:doc: FPGA Manager flags
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_image_info
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_mgr_states
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_image_info_alloc
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_image_info_free
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: of_fpga_mgr_get
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_get
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_put
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_lock
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_unlock
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_mgr_states
Note - use :c:func:`fpga_region_program_fpga()` instead of :c:func:`fpga_mgr_load()`
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_load

107
Documentation/driver-api/fpga/fpga-programming.rst Normal file
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@ -0,0 +1,107 @@
In-kernel API for FPGA Programming
==================================
Overview
--------
The in-kernel API for FPGA programming is a combination of APIs from
FPGA manager, bridge, and regions. The actual function used to
trigger FPGA programming is :c:func:`fpga_region_program_fpga()`.
:c:func:`fpga_region_program_fpga()` uses functionality supplied by
the FPGA manager and bridges. It will:
* lock the region's mutex
* lock the mutex of the region's FPGA manager
* build a list of FPGA bridges if a method has been specified to do so
* disable the bridges
* program the FPGA using info passed in :c:member:`fpga_region->info`.
* re-enable the bridges
* release the locks
The struct fpga_image_info specifies what FPGA image to program. It is
allocated/freed by :c:func:`fpga_image_info_alloc()` and freed with
:c:func:`fpga_image_info_free()`
How to program an FPGA using a region
-------------------------------------
When the FPGA region driver probed, it was given a pointer to an FPGA manager
driver so it knows which manager to use. The region also either has a list of
bridges to control during programming or it has a pointer to a function that
will generate that list. Here's some sample code of what to do next::
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-region.h>
struct fpga_image_info *info;
int ret;
/*
* First, alloc the struct with information about the FPGA image to
* program.
*/
info = fpga_image_info_alloc(dev);
if (!info)
return -ENOMEM;
/* Set flags as needed, such as: */
info->flags = FPGA_MGR_PARTIAL_RECONFIG;
/*
* Indicate where the FPGA image is. This is pseudo-code; you're
* going to use one of these three.
*/
if (image is in a scatter gather table) {
info->sgt = [your scatter gather table]
} else if (image is in a buffer) {
info->buf = [your image buffer]
info->count = [image buffer size]
} else if (image is in a firmware file) {
info->firmware_name = devm_kstrdup(dev, firmware_name,
GFP_KERNEL);
}
/* Add info to region and do the programming */
region->info = info;
ret = fpga_region_program_fpga(region);
/* Deallocate the image info if you're done with it */
region->info = NULL;
fpga_image_info_free(info);
if (ret)
return ret;
/* Now enumerate whatever hardware has appeared in the FPGA. */
API for programming an FPGA
---------------------------
* :c:func:`fpga_region_program_fpga` — Program an FPGA
* :c:type:`fpga_image_info` — Specifies what FPGA image to program
* :c:func:`fpga_image_info_alloc()` — Allocate an FPGA image info struct
* :c:func:`fpga_image_info_free()` — Free an FPGA image info struct
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_program_fpga
FPGA Manager flags
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:doc: FPGA Manager flags
.. kernel-doc:: include/linux/fpga/fpga-mgr.h
:functions: fpga_image_info
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_image_info_alloc
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_image_info_free

92
Documentation/driver-api/fpga/fpga-region.rst
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@ -34,41 +34,6 @@ fpga_image_info including:
* flags indicating specifics such as whether the image is for partial
reconfiguration.
How to program an FPGA using a region
-------------------------------------
First, allocate the info struct::
info = fpga_image_info_alloc(dev);
if (!info)
return -ENOMEM;
Set flags as needed, i.e.::
info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
Point to your FPGA image, such as::
info->sgt = &sgt;
Add info to region and do the programming::
region->info = info;
ret = fpga_region_program_fpga(region);
:c:func:`fpga_region_program_fpga()` operates on info passed in the
fpga_image_info (region->info). This function will attempt to:
* lock the region's mutex
* lock the region's FPGA manager
* build a list of FPGA bridges if a method has been specified to do so
* disable the bridges
* program the FPGA
* re-enable the bridges
* release the locks
Then you will want to enumerate whatever hardware has appeared in the FPGA.
How to add a new FPGA region
----------------------------
@ -77,29 +42,62 @@ An example of usage can be seen in the probe function of [#f2]_.
.. [#f1] ../devicetree/bindings/fpga/fpga-region.txt
.. [#f2] ../../drivers/fpga/of-fpga-region.c
API to program an FPGA
----------------------
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_program_fpga
API to add a new FPGA region
----------------------------
* struct :c:type:`fpga_region` — The FPGA region struct
* :c:func:`devm_fpga_region_create` — Allocate and init a region struct
* :c:func:`fpga_region_register` — Register an FPGA region
* :c:func:`fpga_region_unregister` — Unregister an FPGA region
The FPGA region's probe function will need to get a reference to the FPGA
Manager it will be using to do the programming. This usually would happen
during the region's probe function.
* :c:func:`fpga_mgr_get` — Get a reference to an FPGA manager, raise ref count
* :c:func:`of_fpga_mgr_get` — Get a reference to an FPGA manager, raise ref count,
given a device node.
* :c:func:`fpga_mgr_put` — Put an FPGA manager
The FPGA region will need to specify which bridges to control while programming
the FPGA. The region driver can build a list of bridges during probe time
(:c:member:`fpga_region->bridge_list`) or it can have a function that creates
the list of bridges to program just before programming
(:c:member:`fpga_region->get_bridges`). The FPGA bridge framework supplies the
following APIs to handle building or tearing down that list.
* :c:func:`fpga_bridge_get_to_list` — Get a ref of an FPGA bridge, add it to a
list
* :c:func:`of_fpga_bridge_get_to_list` — Get a ref of an FPGA bridge, add it to a
list, given a device node
* :c:func:`fpga_bridges_put` — Given a list of bridges, put them
.. kernel-doc:: include/linux/fpga/fpga-region.h
:functions: fpga_region
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: devm_fpga_region_create
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_create
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_free
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_register
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_unregister
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_get
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: of_fpga_mgr_get
.. kernel-doc:: drivers/fpga/fpga-mgr.c
:functions: fpga_mgr_put
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_get_to_list
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: of_fpga_bridge_get_to_list
.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridges_put

2
Documentation/driver-api/fpga/index.rst
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@ -11,3 +11,5 @@ FPGA Subsystem
fpga-mgr
fpga-bridge
fpga-region
fpga-programming

2
Documentation/driver-api/fpga/intro.rst
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@ -44,7 +44,7 @@ FPGA Region
-----------
If you are adding a new interface to the FPGA framework, add it on top
of an FPGA region to allow the most reuse of your interface.
of an FPGA region.
The FPGA Region framework (fpga-region.c) associates managers and
bridges as reconfigurable regions. A region may refer to the whole