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/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/types.h>
18
19 #include "pvpanic.h"
20
21 MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
22 MODULE_DESCRIPTION("pvpanic-mmio device driver");
23 MODULE_LICENSE("GPL");
24
pvpanic_mmio_probe(struct platform_device * pdev)25 static int pvpanic_mmio_probe(struct platform_device *pdev)
26 {
27 struct device *dev = &pdev->dev;
28 struct resource *res;
29 void __iomem *base;
30
31 res = platform_get_mem_or_io(pdev, 0);
32 if (!res)
33 return -EINVAL;
34
35 switch (resource_type(res)) {
36 case IORESOURCE_IO:
37 base = devm_ioport_map(dev, res->start, resource_size(res));
38 if (!base)
39 return -ENOMEM;
40 break;
41 case IORESOURCE_MEM:
42 base = devm_ioremap_resource(dev, res);
43 if (IS_ERR(base))
44 return PTR_ERR(base);
45 break;
46 default:
47 return -EINVAL;
48 }
49
50 return devm_pvpanic_probe(dev, base);
51 }
52
53 static const struct of_device_id pvpanic_mmio_match[] = {
54 { .compatible = "qemu,pvpanic-mmio" },
55 { }
56 };
57 MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
58
59 static const struct acpi_device_id pvpanic_device_ids[] = {
60 { .id = "QEMU0001" },
61 { }
62 };
63 MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
64
65 static struct platform_driver pvpanic_mmio_driver = {
66 .driver = {
67 .name = "pvpanic-mmio",
68 .of_match_table = pvpanic_mmio_match,
69 .acpi_match_table = pvpanic_device_ids,
70 .dev_groups = pvpanic_dev_groups,
71 },
72 .probe = pvpanic_mmio_probe,
73 };
74 module_platform_driver(pvpanic_mmio_driver);
75