drivers/fpga/dfl-fme-region.c

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