Skip to content

Commit 322ddeb

Browse files
Kang Luweigregkh
Kang Luwei
authored and
gregkh
committed
fpga: dfl: add FPGA Management Engine driver basic framework
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 DFL framework. 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 <[email protected]> Signed-off-by: Enno Luebbers <[email protected]> Signed-off-by: Shiva Rao <[email protected]> Signed-off-by: Christopher Rauer <[email protected]> Signed-off-by: Kang Luwei <[email protected]> Signed-off-by: Xiao Guangrong <[email protected]> Signed-off-by: Wu Hao <[email protected]> Acked-by: Alan Tull <[email protected]> Acked-by: Moritz Fischer <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
1 parent 968b819 commit 322ddeb

File tree

3 files changed

+171
-0
lines changed

3 files changed

+171
-0
lines changed

‎drivers/fpga/Kconfig

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -146,6 +146,16 @@ config FPGA_DFL
146146
Gate Array (FPGA) solutions which implement Device Feature List.
147147
It provides enumeration APIs and feature device infrastructure.
148148

149+
config FPGA_DFL_FME
150+
tristate "FPGA DFL FME Driver"
151+
depends on FPGA_DFL
152+
help
153+
The FPGA Management Engine (FME) is a feature device implemented
154+
under Device Feature List (DFL) framework. Select this option to
155+
enable the platform device driver for FME which implements all
156+
FPGA platform level management features. There shall be one FME
157+
per DFL based FPGA device.
158+
149159
config FPGA_DFL_PCI
150160
tristate "FPGA DFL PCIe Device Driver"
151161
depends on PCI && FPGA_DFL

‎drivers/fpga/Makefile

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -31,6 +31,9 @@ obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o
3131

3232
# FPGA Device Feature List Support
3333
obj-$(CONFIG_FPGA_DFL) += dfl.o
34+
obj-$(CONFIG_FPGA_DFL_FME) += dfl-fme.o
35+
36+
dfl-fme-objs := dfl-fme-main.o
3437

3538
# Drivers for FPGAs which implement DFL
3639
obj-$(CONFIG_FPGA_DFL_PCI) += dfl-pci.o

‎drivers/fpga/dfl-fme-main.c

Lines changed: 158 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,158 @@
1+
// SPDX-License-Identifier: GPL-2.0
2+
/*
3+
* Driver for FPGA Management Engine (FME)
4+
*
5+
* Copyright (C) 2017-2018 Intel Corporation, Inc.
6+
*
7+
* Authors:
8+
* Kang Luwei <[email protected]>
9+
* Xiao Guangrong <[email protected]>
10+
* Joseph Grecco <[email protected]>
11+
* Enno Luebbers <[email protected]>
12+
* Tim Whisonant <[email protected]>
13+
* Ananda Ravuri <[email protected]>
14+
* Henry Mitchel <[email protected]>
15+
*/
16+
17+
#include <linux/kernel.h>
18+
#include <linux/module.h>
19+
20+
#include "dfl.h"
21+
22+
static int fme_hdr_init(struct platform_device *pdev,
23+
struct dfl_feature *feature)
24+
{
25+
dev_dbg(&pdev->dev, "FME HDR Init.\n");
26+
27+
return 0;
28+
}
29+
30+
static void fme_hdr_uinit(struct platform_device *pdev,
31+
struct dfl_feature *feature)
32+
{
33+
dev_dbg(&pdev->dev, "FME HDR UInit.\n");
34+
}
35+
36+
static const struct dfl_feature_ops fme_hdr_ops = {
37+
.init = fme_hdr_init,
38+
.uinit = fme_hdr_uinit,
39+
};
40+
41+
static struct dfl_feature_driver fme_feature_drvs[] = {
42+
{
43+
.id = FME_FEATURE_ID_HEADER,
44+
.ops = &fme_hdr_ops,
45+
},
46+
{
47+
.ops = NULL,
48+
},
49+
};
50+
51+
static int fme_open(struct inode *inode, struct file *filp)
52+
{
53+
struct platform_device *fdev = dfl_fpga_inode_to_feature_dev(inode);
54+
struct dfl_feature_platform_data *pdata = dev_get_platdata(&fdev->dev);
55+
int ret;
56+
57+
if (WARN_ON(!pdata))
58+
return -ENODEV;
59+
60+
ret = dfl_feature_dev_use_begin(pdata);
61+
if (ret)
62+
return ret;
63+
64+
dev_dbg(&fdev->dev, "Device File Open\n");
65+
filp->private_data = pdata;
66+
67+
return 0;
68+
}
69+
70+
static int fme_release(struct inode *inode, struct file *filp)
71+
{
72+
struct dfl_feature_platform_data *pdata = filp->private_data;
73+
struct platform_device *pdev = pdata->dev;
74+
75+
dev_dbg(&pdev->dev, "Device File Release\n");
76+
dfl_feature_dev_use_end(pdata);
77+
78+
return 0;
79+
}
80+
81+
static long fme_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
82+
{
83+
struct dfl_feature_platform_data *pdata = filp->private_data;
84+
struct platform_device *pdev = pdata->dev;
85+
struct dfl_feature *f;
86+
long ret;
87+
88+
dev_dbg(&pdev->dev, "%s cmd 0x%x\n", __func__, cmd);
89+
90+
switch (cmd) {
91+
default:
92+
/*
93+
* Let sub-feature's ioctl function to handle the cmd.
94+
* Sub-feature's ioctl returns -ENODEV when cmd is not
95+
* handled in this sub feature, and returns 0 or other
96+
* error code if cmd is handled.
97+
*/
98+
dfl_fpga_dev_for_each_feature(pdata, f) {
99+
if (f->ops && f->ops->ioctl) {
100+
ret = f->ops->ioctl(pdev, f, cmd, arg);
101+
if (ret != -ENODEV)
102+
return ret;
103+
}
104+
}
105+
}
106+
107+
return -EINVAL;
108+
}
109+
110+
static const struct file_operations fme_fops = {
111+
.owner = THIS_MODULE,
112+
.open = fme_open,
113+
.release = fme_release,
114+
.unlocked_ioctl = fme_ioctl,
115+
};
116+
117+
static int fme_probe(struct platform_device *pdev)
118+
{
119+
int ret;
120+
121+
ret = dfl_fpga_dev_feature_init(pdev, fme_feature_drvs);
122+
if (ret)
123+
goto exit;
124+
125+
ret = dfl_fpga_dev_ops_register(pdev, &fme_fops, THIS_MODULE);
126+
if (ret)
127+
goto feature_uinit;
128+
129+
return 0;
130+
131+
feature_uinit:
132+
dfl_fpga_dev_feature_uinit(pdev);
133+
exit:
134+
return ret;
135+
}
136+
137+
static int fme_remove(struct platform_device *pdev)
138+
{
139+
dfl_fpga_dev_ops_unregister(pdev);
140+
dfl_fpga_dev_feature_uinit(pdev);
141+
142+
return 0;
143+
}
144+
145+
static struct platform_driver fme_driver = {
146+
.driver = {
147+
.name = DFL_FPGA_FEATURE_DEV_FME,
148+
},
149+
.probe = fme_probe,
150+
.remove = fme_remove,
151+
};
152+
153+
module_platform_driver(fme_driver);
154+
155+
MODULE_DESCRIPTION("FPGA Management Engine driver");
156+
MODULE_AUTHOR("Intel Corporation");
157+
MODULE_LICENSE("GPL v2");
158+
MODULE_ALIAS("platform:dfl-fme");

0 commit comments

Comments
 (0)