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); 77