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
22 struct 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
fme_bridge_enable_set(struct fpga_bridge * bridge,bool enable)28 static 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
55 static const struct fpga_bridge_ops fme_bridge_ops = {
56 .enable_set = fme_bridge_enable_set,
57 };
58
fme_br_probe(struct platform_device * pdev)59 static 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
fme_br_remove(struct platform_device * pdev)81 static 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
96 static 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
104 module_platform_driver(fme_br_driver);
105
106 MODULE_DESCRIPTION("FPGA Bridge for DFL FPGA Management Engine");
107 MODULE_AUTHOR("Intel Corporation");
108 MODULE_LICENSE("GPL v2");
109 MODULE_ALIAS("platform:dfl-fme-bridge");
110