ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/Documentation/driver-api/fpga/fpga-mgr.rst b/marvell/linux/Documentation/driver-api/fpga/fpga-mgr.rst
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+FPGA Manager
+============
+
+Overview
+--------
+
+The FPGA manager core exports a set of functions for programming an FPGA with
+an 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.
+
+The FPGA image to be programmed can be in a scatter gather list, a single
+contiguous buffer, or a firmware file. Because allocating contiguous kernel
+memory for the buffer should be avoided, users are encouraged to use a scatter
+gather list instead if possible.
+
+The particulars for programming the image are presented in a structure (struct
+fpga_image_info). This struct contains parameters such as pointers to the
+FPGA image as well as image-specific particulars such as whether the image was
+built for full or partial reconfiguration.
+
+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;
+ struct fpga_manager *mgr;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /*
+ * do ioremaps, get interrupts, etc. and save
+ * them in priv
+ */
+
+ mgr = devm_fpga_mgr_create(dev, "Altera SOCFPGA FPGA Manager",
+ &socfpga_fpga_ops, priv);
+ if (!mgr)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, mgr);
+
+ return fpga_mgr_register(mgr);
+ }
+
+ static int socfpga_fpga_remove(struct platform_device *pdev)
+ {
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+
+ fpga_mgr_unregister(mgr);
+
+ 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 or .write_sg (may be called once or multiple times)
+ 3. .write_complete
+
+The .write_init function will prepare the FPGA to receive the image data. The
+buffer passed into .write_init will be at most .initial_header_size bytes long;
+if the whole bitstream is not immediately available then the core code will
+buffer up at least this much before starting.
+
+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. This interface
+is suitable for drivers which use PIO.
+
+The .write_sg version behaves the same as .write except the input is a sg_table
+scatter list. This interface is suitable for drivers which use DMA.
+
+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 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.
+
+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
+
+.. kernel-doc:: include/linux/fpga/fpga-mgr.h
+ :functions: fpga_manager_ops
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: devm_fpga_mgr_create
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_register
+
+.. kernel-doc:: drivers/fpga/fpga-mgr.c
+ :functions: fpga_mgr_unregister