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Commit 1a1527cf authored by Wu Hao's avatar Wu Hao Committed by Greg Kroah-Hartman
Browse files

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: default avatarTim Whisonant <tim.whisonant@intel.com>
Signed-off-by: default avatarEnno Luebbers <enno.luebbers@intel.com>
Signed-off-by: default avatarShiva Rao <shiva.rao@intel.com>
Signed-off-by: default avatarChristopher Rauer <christopher.rauer@intel.com>
Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarWu Hao <hao.wu@intel.com>
Acked-by: default avatarAlan Tull <atull@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7514a424

drivers/fpga/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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

drivers/fpga/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/fpga/dfl-afu-main.c

0 → 100644
+162 −0
Original line number Diff line number Diff line 
// 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");