1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Pvpanic MMIO Device Support
4 *
5 * Copyright (C) 2013 Fujitsu.
6 * Copyright (C) 2018 ZTE.
7 * Copyright (C) 2021 Oracle.
8 */
9
10#include <linux/device.h>
11#include <linux/err.h>
12#include <linux/io.h>
13#include <linux/ioport.h>
14#include <linux/kexec.h>
15#include <linux/mod_devicetable.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/types.h>
19
20#include "pvpanic.h"
21
22MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
23MODULE_DESCRIPTION("pvpanic-mmio device driver");
24MODULE_LICENSE("GPL");
25
26static int pvpanic_mmio_probe(struct platform_device *pdev)
27{
28 struct device *dev = &pdev->dev;
29 struct resource *res;
30 void __iomem *base;
31
32 res = platform_get_mem_or_io(pdev, 0);
33 if (!res)
34 return -EINVAL;
35
36 switch (resource_type(res)) {
37 case IORESOURCE_IO:
38 base = devm_ioport_map(dev, port: res->start, nr: resource_size(res));
39 if (!base)
40 return -ENOMEM;
41 break;
42 case IORESOURCE_MEM:
43 base = devm_ioremap_resource(dev, res);
44 if (IS_ERR(ptr: base))
45 return PTR_ERR(ptr: base);
46 break;
47 default:
48 return -EINVAL;
49 }
50
51 return devm_pvpanic_probe(dev, base);
52}
53
54static const struct of_device_id pvpanic_mmio_match[] = {
55 { .compatible = "qemu,pvpanic-mmio", },
56 {}
57};
58MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
59
60static const struct acpi_device_id pvpanic_device_ids[] = {
61 { "QEMU0001", 0 },
62 { "", 0 }
63};
64MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
65
66static struct platform_driver pvpanic_mmio_driver = {
67 .driver = {
68 .name = "pvpanic-mmio",
69 .of_match_table = pvpanic_mmio_match,
70 .acpi_match_table = pvpanic_device_ids,
71 .dev_groups = pvpanic_dev_groups,
72 },
73 .probe = pvpanic_mmio_probe,
74};
75module_platform_driver(pvpanic_mmio_driver);
76

source code of linux/drivers/misc/pvpanic/pvpanic-mmio.c