drivers/fpga/dfl-fme-br.c

   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
  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
  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
  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");