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/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
  22 MODULE_AUTHOR("Hu Tao <[email protected]>");
  23 MODULE_DESCRIPTION("pvpanic-mmio device driver");
  24 MODULE_LICENSE("GPL");
  25
  26 static 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
  54 static const struct of_device_id pvpanic_mmio_match[] = {
  55         { .compatible = "qemu,pvpanic-mmio", },
  56         {}
  57 };
  58 MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
  59
  60 static const struct acpi_device_id pvpanic_device_ids[] = {
  61         { "QEMU0001", 0 },
  62         { "", 0 }
  63 };
  64 MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
  65
  66 static 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 };
  75 module_platform_driver(pvpanic_mmio_driver);