linux-imx

// 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_platform.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

​

static const struct of_device_id fpga_region_of_match[] = {

    { .compatible = "fpga-region", },

    {},

};

MODULE_DEVICE_TABLE(of, fpga_region_of_match);

​

static int fpga_region_of_node_match(struct device *dev, const void *data)

{

    return dev->of_node == data;

}

​

/**

 * of_fpga_region_find - find FPGA region

 * @np: device node of FPGA Region

 *

 * Caller will need to put_device(&region->dev) when done.

 *

 * Returns FPGA Region struct or NULL

 */

static struct fpga_region *of_fpga_region_find(struct device_node *np)

{

    return fpga_region_class_find(NULL, np, fpga_region_of_node_match);

}

​

/**

 * 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)

{

    struct device_node  *mgr_node;

    struct fpga_manager *mgr;

​

    of_node_get(np);

    while (np) {

        if (of_device_is_compatible(np, "fpga-region")) {

            mgr_node = of_parse_phandle(np, "fpga-mgr", 0);

            if (mgr_node) {

                mgr = of_fpga_mgr_get(mgr_node);

                of_node_put(mgr_node);

                of_node_put(np);

                return mgr;

            }

        }

        np = of_get_next_parent(np);

    }

    of_node_put(np);

​

    return ERR_PTR(-EINVAL);

}

​

/**

 * 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)

{