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");
110