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 = fpga_bridge_register(dev, "DFL FPGA FME Bridge",
72				  &fme_bridge_ops, priv);
73	if (IS_ERR(br))
74		return PTR_ERR(br);
75
76	platform_set_drvdata(pdev, br);
77
78	return 0;
79}
80
81static void 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
94static struct platform_driver fme_br_driver = {
95	.driver	= {
96		.name    = DFL_FPGA_FME_BRIDGE,
97	},
98	.probe   = fme_br_probe,
99	.remove_new = fme_br_remove,
100};
101
102module_platform_driver(fme_br_driver);
103
104MODULE_DESCRIPTION("FPGA Bridge for DFL FPGA Management Engine");
105MODULE_AUTHOR("Intel Corporation");
106MODULE_LICENSE("GPL v2");
107MODULE_ALIAS("platform:dfl-fme-bridge");
108