1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * FPGA Bridge Driver for FPGA Management Engine (FME)
  4 *
  5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
  6 *
  7 * Authors:
  8 *   Wu Hao <hao.wu@intel.com>
  9 *   Joseph Grecco <joe.grecco@intel.com>
 10 *   Enno Luebbers <enno.luebbers@intel.com>
 11 *   Tim Whisonant <tim.whisonant@intel.com>
 12 *   Ananda Ravuri <ananda.ravuri@intel.com>
 13 *   Henry Mitchel <henry.mitchel@intel.com>
 14 */
 15
 16#include <linux/module.h>
 17#include <linux/fpga/fpga-bridge.h>
 18
 19#include "dfl.h"
 20#include "dfl-fme-pr.h"
 21
 22struct fme_br_priv {
 23	struct dfl_fme_br_pdata *pdata;
 24	struct dfl_fpga_port_ops *port_ops;
 25	struct platform_device *port_pdev;
 26};
 27
 28static int fme_bridge_enable_set(struct fpga_bridge *bridge, bool enable)
 29{
 30	struct fme_br_priv *priv = bridge->priv;
 31	struct platform_device *port_pdev;
 32	struct dfl_fpga_port_ops *ops;
 33
 34	if (!priv->port_pdev) {
 35		port_pdev = dfl_fpga_cdev_find_port(priv->pdata->cdev,
 36						    &priv->pdata->port_id,
 37						    dfl_fpga_check_port_id);
 38		if (!port_pdev)
 39			return -ENODEV;
 40
 41		priv->port_pdev = port_pdev;
 42	}
 43
 44	if (priv->port_pdev && !priv->port_ops) {
 45		ops = dfl_fpga_port_ops_get(priv->port_pdev);
 46		if (!ops || !ops->enable_set)
 47			return -ENOENT;
 48
 49		priv->port_ops = ops;
 50	}
 51
 52	return priv->port_ops->enable_set(priv->port_pdev, enable);
 53}
 54
 55static const struct fpga_bridge_ops fme_bridge_ops = {
 56	.enable_set = fme_bridge_enable_set,
 57};
 58
 59static int fme_br_probe(struct platform_device *pdev)
 60{
 61	struct device *dev = &pdev->dev;
 62	struct fme_br_priv *priv;
 63	struct fpga_bridge *br;
 64
 65	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 66	if (!priv)
 67		return -ENOMEM;
 68
 69	priv->pdata = dev_get_platdata(dev);
 70
 71	br = devm_fpga_bridge_create(dev, "DFL FPGA FME Bridge",
 72				     &fme_bridge_ops, priv);
 73	if (!br)
 74		return -ENOMEM;
 75
 76	platform_set_drvdata(pdev, br);
 77
 78	return fpga_bridge_register(br);
 79}
 80
 81static int fme_br_remove(struct platform_device *pdev)
 82{
 83	struct fpga_bridge *br = platform_get_drvdata(pdev);
 84	struct fme_br_priv *priv = br->priv;
 85
 86	fpga_bridge_unregister(br);
 87
 88	if (priv->port_pdev)
 89		put_device(&priv->port_pdev->dev);
 90	if (priv->port_ops)
 91		dfl_fpga_port_ops_put(priv->port_ops);
 92
 93	return 0;
 94}
 95
 96static struct platform_driver fme_br_driver = {
 97	.driver	= {
 98		.name    = DFL_FPGA_FME_BRIDGE,
 99	},
100	.probe   = fme_br_probe,
101	.remove  = fme_br_remove,
102};
103
104module_platform_driver(fme_br_driver);
105
106MODULE_DESCRIPTION("FPGA Bridge for DFL FPGA Management Engine");
107MODULE_AUTHOR("Intel Corporation");
108MODULE_LICENSE("GPL v2");
109MODULE_ALIAS("platform:dfl-fme-bridge");