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Message-ID: <1439487452-23977-3-git-send-email-atull@opensource.altera.com>
Date: Thu, 13 Aug 2015 12:37:25 -0500
From: <atull@...nsource.altera.com>
To: <gregkh@...uxfoundation.org>, <jgunthorpe@...idianresearch.com>,
<hpa@...or.com>, <monstr@...str.eu>, <michal.simek@...inx.com>,
<rdunlap@...radead.org>
CC: Moritz Fischer <moritz.fischer@...us.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<pantelis.antoniou@...sulko.com>, <robh+dt@...nel.org>,
<grant.likely@...aro.org>, <iws@...o.caltech.edu>,
<linux-doc@...r.kernel.org>, <pavel@...x.de>, <broonie@...nel.org>,
<philip@...ister.org>, <rubini@...dd.com>,
<s.trumtrar@...gutronix.de>, <jason@...edaemon.net>,
<kyle.teske@...com>, <nico@...aro.org>, <balbi@...com>,
<m.chehab@...sung.com>, <davidb@...eaurora.org>, <rob@...dley.net>,
<davem@...emloft.net>, <cesarb@...arb.net>,
<sameo@...ux.intel.com>, <akpm@...ux-foundation.org>,
<linus.walleij@...aro.org>, <pawel.moll@....com>,
<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
<galak@...eaurora.org>, <devel@...verdev.osuosl.org>,
Petr Cvek <petr.cvek@....cz>, <delicious.quinoa@...il.com>,
<dinguyen@...nsource.altera.com>,
Alan Tull <atull@...nsource.altera.com>
Subject: [PATCH v10 1/8] usage documentation for FPGA manager core
From: Alan Tull <atull@...nsource.altera.com>
Add a document on the new FPGA manager core.
Signed-off-by: Alan Tull <atull@...nsource.altera.com>
---
v9: initial version where this patch was added
v10: requested cleanups to formatting and otherwise
s/fpga/FPGA/g
rewrite implementation section to not reference socfpga.c by name
other rewrites
Moved to Documentation/fpga/
---
Documentation/fpga/fpga-mgr.txt | 171 +++++++++++++++++++++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 Documentation/fpga/fpga-mgr.txt
diff --git a/Documentation/fpga/fpga-mgr.txt b/Documentation/fpga/fpga-mgr.txt
new file mode 100644
index 0000000..c5259e4
--- /dev/null
+++ b/Documentation/fpga/fpga-mgr.txt
@@ -0,0 +1,171 @@
+FPGA Manager Core
+
+Alan Tull 2015
+
+Overview
+========
+
+The FPGA manager core exports a set of functions for programming an FPGA with
+image. The API is manufacturer agnostic. All manufacturer specifics are
+hidden away in a low level driver which registers a set of ops with the core.
+The FPGA image data itself is very manufacturer specific, but for our purposes
+it's just binary data. The FPGA manager core won't parse it.
+
+
+API Functions:
+==============
+
+To program the FPGA from a file or from a buffer:
+-------------------------------------------------
+
+ int fpga_mgr_buf_load(struct fpga_manager *mgr, u32 flags,
+ const char *buf, size_t count);
+
+Load the FPGA from an image which exists as a buffer in memory.
+
+ int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags,
+ const char *image_name);
+
+Load the FPGA from an image which exists as a file. The image file must be on
+the firmware search path (see the firmware class documentation).
+
+For both these functions, flags == 0 for normal full reconfiguration or
+FPGA_MGR_PARTIAL_RECONFIG for partial reconfiguration. If successful, the FPGA
+ends up in operating mode. Return 0 on success or a negative error code.
+
+
+To get/put a reference to a FPGA manager:
+-----------------------------------------
+
+ struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
+
+ void fpga_mgr_put(struct fpga_manager *mgr);
+
+Given a DT node, get an exclusive reference to a FPGA manager or release
+the reference.
+
+
+To register or unregister the low level FPGA-specific driver:
+-------------------------------------------------------------
+
+ int fpga_mgr_register(struct device *dev, const char *name,
+ const struct fpga_manager_ops *mops,
+ void *priv);
+
+ void fpga_mgr_unregister(struct device *dev);
+
+Use of these two functions is described below in "How To Support a new FPGA
+device."
+
+
+How to write an image buffer to a supported FPGA
+================================================
+/* Include to get the API */
+#include <linux/fpga/fpga-mgr.h>
+
+/* device node that specifies the FPGA manager to use */
+struct device_node *mgr_node = ...
+
+/* FPGA image is in this buffer. count is size of the buffer. */
+char *buf = ...
+int count = ...
+
+/* flags indicates whether to do full or partial reconfiguration */
+int flags = 0;
+
+int ret;
+
+/* Get exclusive control of FPGA manager */
+struct fpga_manager *mgr = of_fpga_mgr_get(mgr_node);
+
+/* Load the buffer to the FPGA */
+ret = fpga_mgr_buf_load(mgr, flags, buf, count);
+
+/* Release the FPGA manager */
+fpga_mgr_put(mgr);
+
+
+How to write an image file to a supported FPGA
+==============================================
+/* Include to get the API */
+#include <linux/fpga/fpga-mgr.h>
+
+/* device node that specifies the FPGA manager to use */
+struct device_node *mgr_node = ...
+
+/* FPGA image is in this file which is on the firmware search path */
+const char *path = "fpga-image-9.rbf"
+
+/* flags indicates whether to do full or partial reconfiguration */
+int flags = 0;
+
+int ret;
+
+/* Get exclusive control of FPGA manager */
+struct fpga_manager *mgr = of_fpga_mgr_get(mgr_node);
+
+/* Get the firmware image (path) and load it to the FPGA */
+ret = fpga_mgr_firmware_load(mgr, flags, path);
+
+/* Release the FPGA manager */
+fpga_mgr_put(mgr);
+
+
+How to support a new FPGA device
+================================
+To add another FPGA manager, write a driver that implements a set of ops. The
+probe function calls fpga_mgr_register(), such as:
+
+static const struct fpga_manager_ops socfpga_fpga_ops = {
+ .write_init = socfpga_fpga_ops_configure_init,
+ .write = socfpga_fpga_ops_configure_write,
+ .write_complete = socfpga_fpga_ops_configure_complete,
+ .state = socfpga_fpga_ops_state,
+};
+
+static int socfpga_fpga_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct socfpga_fpga_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* ... do ioremaps, get interrupts, etc. and save
+ them in priv... */
+
+ return fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
+ &socfpga_fpga_ops, priv);
+}
+
+static int socfpga_fpga_remove(struct platform_device *pdev)
+{
+ fpga_mgr_unregister(&pdev->dev);
+
+ return 0;
+}
+
+
+The ops will implement whatever device specific register writes are needed to
+do the programming sequence for this particular FPGA. These ops return 0 for
+success or negative error codes otherwise.
+
+The programming sequence is:
+ 1. .write_init
+ 2. .write (may be called once or multiple times)
+ 3. .write_complete
+
+The .write_init function will prepare the FPGA to receive the image data.
+
+The .write function writes a buffer to the FPGA. The buffer may be contain the
+whole FPGA image or may be a smaller chunk of an FPGA image. In the latter
+case, this function is called multiple times for successive chunks.
+
+The .write_complete function is called after all the image has been written
+to put the FPGA into operating mode.
+
+The ops include a .state function which will read the hardware FPGA manager and
+return a code of type enum fpga_mgr_states. It doesn't result in a change in
+hardware state.
--
1.7.9.5
--
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