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 <hutao@cn.fujitsu.com>"); 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); 76