3 files changed, 173 insertions, 0 deletions

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index f99f422feec9..1ebcef4bab5b 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -174,6 +174,15 @@ config FPGA_DFL_FME_REGION
         help
           Say Y to enable FPGA Region driver for FPGA Management Engine.
 
+config FPGA_DFL_AFU
+        tristate "FPGA DFL AFU Driver"
+        depends on FPGA_DFL
+        help
+          This is the driver for FPGA Accelerated Function Unit (AFU) which
+          implements AFU and Port management features. A User AFU connects
+          to the FPGA infrastructure via a Port. There may be more than one
+          Port/AFU per DFL based FPGA device.
+
 config FPGA_DFL_PCI
         tristate "FPGA DFL PCIe Device Driver"
         depends on PCI && FPGA_DFL
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index 637c27512c28..1ac7749b2542 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -35,8 +35,10 @@ obj-$(CONFIG_FPGA_DFL_FME)		+= dfl-fme.o
 obj-$(CONFIG_FPGA_DFL_FME_MGR)          += dfl-fme-mgr.o
 obj-$(CONFIG_FPGA_DFL_FME_BRIDGE)       += dfl-fme-br.o
 obj-$(CONFIG_FPGA_DFL_FME_REGION)       += dfl-fme-region.o
+obj-$(CONFIG_FPGA_DFL_AFU)              += dfl-afu.o
 
 dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o
+dfl-afu-objs := dfl-afu-main.o
 
 # Drivers for FPGAs which implement DFL
 obj-$(CONFIG_FPGA_DFL_PCI)              += dfl-pci.o
diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
new file mode 100644
index 000000000000..08f88cdb3bfc
--- /dev/null
+++ b/drivers/fpga/dfl-afu-main.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for FPGA Accelerated Function Unit (AFU)
+ *
+ * Copyright (C) 2017-2018 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Wu Hao <hao.wu@intel.com>
+ *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *   Joseph Grecco <joe.grecco@intel.com>
+ *   Enno Luebbers <enno.luebbers@intel.com>
+ *   Tim Whisonant <tim.whisonant@intel.com>
+ *   Ananda Ravuri <ananda.ravuri@intel.com>
+ *   Henry Mitchel <henry.mitchel@intel.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "dfl.h"
+
+static int port_hdr_init(struct platform_device *pdev,
+                         struct dfl_feature *feature)
+{
+        dev_dbg(&pdev->dev, "PORT HDR Init.\n");
+
+        return 0;
+}
+
+static void port_hdr_uinit(struct platform_device *pdev,
+                           struct dfl_feature *feature)
+{
+        dev_dbg(&pdev->dev, "PORT HDR UInit.\n");
+}
+
+static const struct dfl_feature_ops port_hdr_ops = {
+        .init = port_hdr_init,
+        .uinit = port_hdr_uinit,
+};
+
+static struct dfl_feature_driver port_feature_drvs[] = {
+        {
+                .id = PORT_FEATURE_ID_HEADER,
+                .ops = &port_hdr_ops,
+        },
+        {
+                .ops = NULL,
+        }
+};
+
+static int afu_open(struct inode *inode, struct file *filp)
+{
+        struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
+        struct dfl_feature_platform_data *pdata;
+        int ret;
+
+        pdata = dev_get_platdata(&fdev->dev);
+        if (WARN_ON(!pdata))
+                return -ENODEV;
+
+        ret = dfl_feature_dev_use_begin(pdata);
+        if (ret)
+                return ret;
+
+        dev_dbg(&fdev->dev, "Device File Open\n");
+        filp->private_data = fdev;
+
+        return 0;
+}
+
+static int afu_release(struct inode *inode, struct file *filp)
+{
+        struct platform_device *pdev = filp->private_data;
+        struct dfl_feature_platform_data *pdata;
+
+        dev_dbg(&pdev->dev, "Device File Release\n");
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        dfl_feature_dev_use_end(pdata);
+
+        return 0;
+}
+
+static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        struct platform_device *pdev = filp->private_data;
+        struct dfl_feature_platform_data *pdata;
+        struct dfl_feature *f;
+        long ret;
+
+        dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        switch (cmd) {
+        default:
+                /*
+                 * Let sub-feature's ioctl function to handle the cmd
+                 * Sub-feature's ioctl returns -ENODEV when cmd is not
+                 * handled in this sub feature, and returns 0 and other
+                 * error code if cmd is handled.
+                 */
+                dfl_fpga_dev_for_each_feature(pdata, f)
+                        if (f->ops && f->ops->ioctl) {
+                                ret = f->ops->ioctl(pdev, f, cmd, arg);
+                                if (ret != -ENODEV)
+                                        return ret;
+                        }
+        }
+
+        return -EINVAL;
+}
+
+static const struct file_operations afu_fops = {
+        .owner = THIS_MODULE,
+        .open = afu_open,
+        .release = afu_release,
+        .unlocked_ioctl = afu_ioctl,
+};
+
+static int afu_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        dev_dbg(&pdev->dev, "%s\n", __func__);
+
+        ret = dfl_fpga_dev_feature_init(pdev, port_feature_drvs);
+        if (ret)
+                return ret;
+
+        ret = dfl_fpga_dev_ops_register(pdev, &afu_fops, THIS_MODULE);
+        if (ret)
+                dfl_fpga_dev_feature_uinit(pdev);
+
+        return ret;
+}
+
+static int afu_remove(struct platform_device *pdev)
+{
+        dev_dbg(&pdev->dev, "%s\n", __func__);
+
+        dfl_fpga_dev_ops_unregister(pdev);
+        dfl_fpga_dev_feature_uinit(pdev);
+
+        return 0;
+}
+
+static struct platform_driver afu_driver = {
+        .driver = {
+                .name    = DFL_FPGA_FEATURE_DEV_PORT,
+        },
+        .probe   = afu_probe,
+        .remove  = afu_remove,
+};
+
+module_platform_driver(afu_driver);
+
+MODULE_DESCRIPTION("FPGA Accelerated Function Unit driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:dfl-port");