1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * FPGA Region 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-mgr.h>
18 #include <linux/fpga/fpga-region.h>
19 
20 #include "dfl-fme-pr.h"
21 
fme_region_get_bridges(struct fpga_region * region)22 static int fme_region_get_bridges(struct fpga_region *region)
23 {
24 	struct dfl_fme_region_pdata *pdata = region->priv;
25 	struct device *dev = &pdata->br->dev;
26 
27 	return fpga_bridge_get_to_list(dev, region->info, &region->bridge_list);
28 }
29 
fme_region_probe(struct platform_device * pdev)30 static int fme_region_probe(struct platform_device *pdev)
31 {
32 	struct dfl_fme_region_pdata *pdata = dev_get_platdata(&pdev->dev);
33 	struct fpga_region_info info = { 0 };
34 	struct device *dev = &pdev->dev;
35 	struct fpga_region *region;
36 	struct fpga_manager *mgr;
37 	int ret;
38 
39 	mgr = fpga_mgr_get(&pdata->mgr->dev);
40 	if (IS_ERR(mgr))
41 		return -EPROBE_DEFER;
42 
43 	info.mgr = mgr;
44 	info.compat_id = mgr->compat_id;
45 	info.get_bridges = fme_region_get_bridges;
46 	info.priv = pdata;
47 	region = fpga_region_register_full(dev, &info);
48 	if (IS_ERR(region)) {
49 		ret = PTR_ERR(region);
50 		goto eprobe_mgr_put;
51 	}
52 
53 	platform_set_drvdata(pdev, region);
54 
55 	dev_dbg(dev, "DFL FME FPGA Region probed\n");
56 
57 	return 0;
58 
59 eprobe_mgr_put:
60 	fpga_mgr_put(mgr);
61 	return ret;
62 }
63 
fme_region_remove(struct platform_device * pdev)64 static int fme_region_remove(struct platform_device *pdev)
65 {
66 	struct fpga_region *region = platform_get_drvdata(pdev);
67 	struct fpga_manager *mgr = region->mgr;
68 
69 	fpga_region_unregister(region);
70 	fpga_mgr_put(mgr);
71 
72 	return 0;
73 }
74 
75 static struct platform_driver fme_region_driver = {
76 	.driver	= {
77 		.name    = DFL_FPGA_FME_REGION,
78 	},
79 	.probe   = fme_region_probe,
80 	.remove  = fme_region_remove,
81 };
82 
83 module_platform_driver(fme_region_driver);
84 
85 MODULE_DESCRIPTION("FPGA Region for DFL FPGA Management Engine");
86 MODULE_AUTHOR("Intel Corporation");
87 MODULE_LICENSE("GPL v2");
88 MODULE_ALIAS("platform:dfl-fme-region");
89