[PATCH 08/16] fpga: intel: add FPGA Management Engine driver basic framework

[Wu Hao]

From: Kang Luwei <luwei.kang@xxxxxxxxx>

The FPGA Management Engine (FME) provides power, thermal management,
performance counters, partial reconfiguration and other functions. For each
function, it is packaged into a private feature linked to the FME feature
device in the 'Device Feature List'. It's a platform device created by
Intel FPGA PCIe driver.

This patch adds the basic framework of FME platform driver. It defines
sub feature drivers to handle the different sub features, including init,
uinit and ioctl. It also registers the file operations for the device file.

Signed-off-by: Tim Whisonant <tim.whisonant@xxxxxxxxx>
Signed-off-by: Enno Luebbers <enno.luebbers@xxxxxxxxx>
Signed-off-by: Shiva Rao <shiva.rao@xxxxxxxxx>
Signed-off-by: Christopher Rauer <christopher.rauer@xxxxxxxxx>
Signed-off-by: Kang Luwei <luwei.kang@xxxxxxxxx>
Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx>
---
 drivers/fpga/intel/Kconfig    |   8 +++
 drivers/fpga/intel/Makefile   |   2 +
 drivers/fpga/intel/fme-main.c | 158 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 168 insertions(+)
 create mode 100644 drivers/fpga/intel/fme-main.c

diff --git a/drivers/fpga/intel/Kconfig b/drivers/fpga/intel/Kconfig
index bf402f3..62e2160 100644
--- a/drivers/fpga/intel/Kconfig
+++ b/drivers/fpga/intel/Kconfig
@@ -24,4 +24,12 @@ config INTEL_FPGA_PCI
 
 	  To compile this as a module, choose M here.
 
+config INTEL_FPGA_FME
+	tristate "Intel FPGA FME Driver"
+	depends on INTEL_FPGA_PCI
+	help
+	  This is the driver for FPGA Management Engine which implements
+	  all FPGA platform level management features. There shall be 1
+	  FME per Intel FPGA.
+
 endif
diff --git a/drivers/fpga/intel/Makefile b/drivers/fpga/intel/Makefile
index c029940..546861d 100644
--- a/drivers/fpga/intel/Makefile
+++ b/drivers/fpga/intel/Makefile
@@ -1,3 +1,5 @@
 obj-$(CONFIG_INTEL_FPGA_PCI) += intel-fpga-pci.o
+obj-$(CONFIG_INTEL_FPGA_FME) += intel-fpga-fme.o
 
 intel-fpga-pci-objs := pcie.o feature-dev.o
+intel-fpga-fme-objs := fme-main.o
diff --git a/drivers/fpga/intel/fme-main.c b/drivers/fpga/intel/fme-main.c
new file mode 100644
index 0000000..c603268
--- /dev/null
+++ b/drivers/fpga/intel/fme-main.c
@@ -0,0 +1,158 @@
+/*
+ * Driver for Intel FPGA Management Engine (FME)
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ *   Kang Luwei <luwei.kang@xxxxxxxxx>
+ *   Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
+ *   Joseph Grecco <joe.grecco@xxxxxxxxx>
+ *   Enno Luebbers <enno.luebbers@xxxxxxxxx>
+ *   Tim Whisonant <tim.whisonant@xxxxxxxxx>
+ *   Ananda Ravuri <ananda.ravuri@xxxxxxxxx>
+ *   Henry Mitchel <henry.mitchel@xxxxxxxxx>
+ *
+ * This work is licensed under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license. See the
+ * LICENSE.BSD file under this directory for the BSD license and see
+ * the COPYING file in the top-level directory for the GPLv2 license.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "feature-dev.h"
+
+static int fme_hdr_init(struct platform_device *pdev, struct feature *feature)
+{
+	dev_dbg(&pdev->dev, "FME HDR Init.\n");
+	return 0;
+}
+
+static void fme_hdr_uinit(struct platform_device *pdev, struct feature *feature)
+{
+	dev_dbg(&pdev->dev, "FME HDR UInit.\n");
+}
+
+struct feature_ops fme_hdr_ops = {
+	.init = fme_hdr_init,
+	.uinit = fme_hdr_uinit,
+};
+
+static struct feature_driver fme_feature_drvs[] = {
+	{
+		.name = FME_FEATURE_HEADER,
+		.ops = &fme_hdr_ops,
+	},
+	{
+		.ops = NULL,
+	},
+};
+
+static int fme_open(struct inode *inode, struct file *filp)
+{
+	struct platform_device *fdev = fpga_inode_to_feature_dev(inode);
+	struct feature_platform_data *pdata = dev_get_platdata(&fdev->dev);
+	int ret;
+
+	if (WARN_ON(!pdata))
+		return -ENODEV;
+
+	ret = feature_dev_use_begin(pdata);
+	if (ret)
+		return ret;
+
+	dev_dbg(&fdev->dev, "Device File Open\n");
+	filp->private_data = pdata;
+	return 0;
+}
+
+static int fme_release(struct inode *inode, struct file *filp)
+{
+	struct feature_platform_data *pdata = filp->private_data;
+	struct platform_device *pdev = pdata->dev;
+
+	dev_dbg(&pdev->dev, "Device File Release\n");
+	feature_dev_use_end(pdata);
+	return 0;
+}
+
+static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct feature_platform_data *pdata = filp->private_data;
+	struct platform_device *pdev = pdata->dev;
+	struct feature *f;
+	long ret;
+
+	dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
+
+	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.
+		 */
+		fpga_dev_for_each_feature(pdata, f) {
+			if (f->ops && f->ops->ioctl) {
+				ret = f->ops->ioctl(pdev, f, cmd, arg);
+				if (ret == -ENODEV)
+					continue;
+				else
+					return ret;
+			}
+		}
+	}
+
+	return -EINVAL;
+}
+
+static const struct file_operations fme_fops = {
+	.owner		= THIS_MODULE,
+	.open		= fme_open,
+	.release	= fme_release,
+	.unlocked_ioctl = fme_ioctl,
+};
+
+static int fme_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = fpga_dev_feature_init(pdev, fme_feature_drvs);
+	if (ret)
+		goto exit;
+
+	ret = fpga_register_dev_ops(pdev, &fme_fops, THIS_MODULE);
+	if (ret)
+		goto feature_uinit;
+
+	return 0;
+
+feature_uinit:
+	fpga_dev_feature_uinit(pdev);
+exit:
+	return ret;
+}
+
+static int fme_remove(struct platform_device *pdev)
+{
+	fpga_dev_feature_uinit(pdev);
+	fpga_unregister_dev_ops(pdev);
+	return 0;
+}
+
+static struct platform_driver fme_driver = {
+	.driver	= {
+		.name    = FPGA_FEATURE_DEV_FME,
+	},
+	.probe   = fme_probe,
+	.remove  = fme_remove,
+};
+
+module_platform_driver(fme_driver);
+
+MODULE_DESCRIPTION("Intel FPGA Management Engine driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("platform:intel-fpga-fme");
-- 
2.7.4