fpga: dfl: add FPGA Accelerated Function Unit driver basic framework

On DFL FPGA devices, the Accelerated Function Unit (AFU), can be
reprogrammed for different functions. It connects to the FPGA
infrastructure (static FPGA region) via a Port. Port CSRs are
implemented separately from the AFU CSRs to provide control and
status of the Port. Once valid PR bitstream is programmed into
the AFU, it allows access to the AFU CSRs in the AFU MMIO space.

This patch only implements basic driver framework for AFU, including
device file operation framework.

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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");