drivers/misc/pvpanic/pvpanic-mmio.c

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