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, res->start, 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(base))
45			return PTR_ERR(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);