projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| de892dff WH |
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 | int ret; | |
| 65 | ||
| 66 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 67 | if (!priv) | |
| 68 | return -ENOMEM; | |
| 69 | ||
| 70 | priv->pdata = dev_get_platdata(dev); | |
| 71 | ||
| 72 | br = fpga_bridge_create(dev, "DFL FPGA FME Bridge", | |
| 73 | &fme_bridge_ops, priv); | |
| 74 | if (!br) | |
| 75 | return -ENOMEM; | |
| 76 | ||
| 77 | platform_set_drvdata(pdev, br); | |
| 78 | ||
| 79 | ret = fpga_bridge_register(br); | |
| 80 | if (ret) | |
| 81 | fpga_bridge_free(br); | |
| 82 | ||
| 83 | return ret; | |
| 84 | } | |
| 85 | ||
| 86 | static int fme_br_remove(struct platform_device *pdev) | |
| 87 | { | |
| 88 | struct fpga_bridge *br = platform_get_drvdata(pdev); | |
| 89 | struct fme_br_priv *priv = br->priv; | |
| 90 | ||
| 91 | fpga_bridge_unregister(br); | |
| 92 | ||
| 93 | if (priv->port_pdev) | |
| 94 | put_device(&priv->port_pdev->dev); | |
| 95 | if (priv->port_ops) | |
| 96 | dfl_fpga_port_ops_put(priv->port_ops); | |
| 97 | ||
| 98 | return 0; | |
| 99 | } | |
| 100 | ||
| 101 | static struct platform_driver fme_br_driver = { | |
| 102 | .driver = { | |
| 103 | .name = DFL_FPGA_FME_BRIDGE, | |
| 104 | }, | |
| 105 | .probe = fme_br_probe, | |
| 106 | .remove = fme_br_remove, | |
| 107 | }; | |
| 108 | ||
| 109 | module_platform_driver(fme_br_driver); | |
| 110 | ||
| 111 | MODULE_DESCRIPTION("FPGA Bridge for DFL FPGA Management Engine"); | |
| 112 | MODULE_AUTHOR("Intel Corporation"); | |
| 113 | MODULE_LICENSE("GPL v2"); | |
| 114 | MODULE_ALIAS("platform:dfl-fme-bridge"); |