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