of-fpga-region.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0
/*
 * FPGA Region - Device Tree support for FPGA programming under Linux
 *
 *  Copyright (C) 2013-2016 Altera Corporation
 *  Copyright (C) 2017 Intel Corporation
 */
#include <linux/fpga/fpga-bridge.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-region.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

static const struct of_device_id fpga_region_of_match[] = …;
MODULE_DEVICE_TABLE(of, fpga_region_of_match);

/**
 * of_fpga_region_find - find FPGA region
 * @np: device node of FPGA Region
 *
 * Caller will need to put_device(&region->dev) when done.
 *
 * Return: FPGA Region struct or NULL
 */
static struct fpga_region *of_fpga_region_find(struct device_node *np)
{ … }

/**
 * of_fpga_region_get_mgr - get reference for FPGA manager
 * @np: device node of FPGA region
 *
 * Get FPGA Manager from "fpga-mgr" property or from ancestor region.
 *
 * Caller should call fpga_mgr_put() when done with manager.
 *
 * Return: fpga manager struct or IS_ERR() condition containing error code.
 */
static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np)
{ … }

/**
 * of_fpga_region_get_bridges - create a list of bridges
 * @region: FPGA region
 *
 * Create a list of bridges including the parent bridge and the bridges
 * specified by "fpga-bridges" property.  Note that the
 * fpga_bridges_enable/disable/put functions are all fine with an empty list
 * if that happens.
 *
 * Caller should call fpga_bridges_put(&region->bridge_list) when
 * done with the bridges.
 *
 * Return: 0 for success (even if there are no bridges specified)
 * or -EBUSY if any of the bridges are in use.
 */
static int of_fpga_region_get_bridges(struct fpga_region *region)
{ … }

/**
 * child_regions_with_firmware - Used to check the child region info.
 * @overlay: device node of the overlay
 *
 * If the overlay adds child FPGA regions, they are not allowed to have
 * firmware-name property.
 *
 * Return: 0 for OK or -EINVAL if child FPGA region adds firmware-name.
 */
static int child_regions_with_firmware(struct device_node *overlay)
{ … }

/**
 * of_fpga_region_parse_ov - parse and check overlay applied to region
 *
 * @region: FPGA region
 * @overlay: overlay applied to the FPGA region
 *
 * Given an overlay applied to an FPGA region, parse the FPGA image specific
 * info in the overlay and do some checking.
 *
 * Return:
 *   NULL if overlay doesn't direct us to program the FPGA.
 *   fpga_image_info struct if there is an image to program.
 *   error code for invalid overlay.
 */
static struct fpga_image_info *
of_fpga_region_parse_ov(struct fpga_region *region,
			struct device_node *overlay)
{ … }

/**
 * of_fpga_region_notify_pre_apply - pre-apply overlay notification
 *
 * @region: FPGA region that the overlay was applied to
 * @nd: overlay notification data
 *
 * Called when an overlay targeted to an FPGA Region is about to be applied.
 * Parses the overlay for properties that influence how the FPGA will be
 * programmed and does some checking. If the checks pass, programs the FPGA.
 * If the checks fail, overlay is rejected and does not get added to the
 * live tree.
 *
 * Return: 0 for success or negative error code for failure.
 */
static int of_fpga_region_notify_pre_apply(struct fpga_region *region,
					   struct of_overlay_notify_data *nd)
{ … }

/**
 * of_fpga_region_notify_post_remove - post-remove overlay notification
 *
 * @region: FPGA region that was targeted by the overlay that was removed
 * @nd: overlay notification data
 *
 * Called after an overlay has been removed if the overlay's target was a
 * FPGA region.
 */
static void of_fpga_region_notify_post_remove(struct fpga_region *region,
					      struct of_overlay_notify_data *nd)
{ … }

/**
 * of_fpga_region_notify - reconfig notifier for dynamic DT changes
 * @nb:		notifier block
 * @action:	notifier action
 * @arg:	reconfig data
 *
 * This notifier handles programming an FPGA when a "firmware-name" property is
 * added to an fpga-region.
 *
 * Return: NOTIFY_OK or error if FPGA programming fails.
 */
static int of_fpga_region_notify(struct notifier_block *nb,
				 unsigned long action, void *arg)
{ … }

static struct notifier_block fpga_region_of_nb = …;

static int of_fpga_region_probe(struct platform_device *pdev)
{ … }

static void of_fpga_region_remove(struct platform_device *pdev)
{ … }

static struct platform_driver of_fpga_region_driver = …;

/**
 * of_fpga_region_init - init function for fpga_region class
 * Creates the fpga_region class and registers a reconfig notifier.
 *
 * Return: 0 on success, negative error code otherwise.
 */
static int __init of_fpga_region_init(void)
{ … }

static void __exit of_fpga_region_exit(void)
{ … }

subsys_initcall(of_fpga_region_init);
module_exit(of_fpga_region_exit);

MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;
linux/drivers/fpga/of-fpga-region.c
