1 /* 2 * system.c - a driver for reserving pnp system resources 3 * 4 * Some code is based on pnpbios_core.c 5 * Copyright 2002 Adam Belay <ambx1@neo.rr.com> 6 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P. 7 * Bjorn Helgaas <bjorn.helgaas@hp.com> 8 */ 9 10 #include <linux/pnp.h> 11 #include <linux/device.h> 12 #include <linux/init.h> 13 #include <linux/slab.h> 14 #include <linux/kernel.h> 15 #include <linux/ioport.h> 16 17 static const struct pnp_device_id pnp_dev_table[] = { 18 /* General ID for reserving resources */ 19 {"PNP0c02", 0}, 20 /* memory controller */ 21 {"PNP0c01", 0}, 22 {"", 0} 23 }; 24 25 static void reserve_range(struct pnp_dev *dev, resource_size_t start, 26 resource_size_t end, int port) 27 { 28 char *regionid; 29 const char *pnpid = dev->dev.bus_id; 30 struct resource *res; 31 32 regionid = kmalloc(16, GFP_KERNEL); 33 if (!regionid) 34 return; 35 36 snprintf(regionid, 16, "pnp %s", pnpid); 37 if (port) 38 res = request_region(start, end - start + 1, regionid); 39 else 40 res = request_mem_region(start, end - start + 1, regionid); 41 if (res) 42 res->flags &= ~IORESOURCE_BUSY; 43 else 44 kfree(regionid); 45 46 /* 47 * Failures at this point are usually harmless. pci quirks for 48 * example do reserve stuff they know about too, so we may well 49 * have double reservations. 50 */ 51 dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n", 52 port ? "ioport" : "iomem", 53 (unsigned long long) start, (unsigned long long) end, 54 res ? "has been" : "could not be"); 55 } 56 57 static void reserve_resources_of_dev(struct pnp_dev *dev) 58 { 59 struct resource *res; 60 int i; 61 62 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { 63 if (res->flags & IORESOURCE_DISABLED) 64 continue; 65 if (res->start == 0) 66 continue; /* disabled */ 67 if (res->start < 0x100) 68 /* 69 * Below 0x100 is only standard PC hardware 70 * (pics, kbd, timer, dma, ...) 71 * We should not get resource conflicts there, 72 * and the kernel reserves these anyway 73 * (see arch/i386/kernel/setup.c). 74 * So, do nothing 75 */ 76 continue; 77 if (res->end < res->start) 78 continue; /* invalid */ 79 80 reserve_range(dev, res->start, res->end, 1); 81 } 82 83 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { 84 if (res->flags & IORESOURCE_DISABLED) 85 continue; 86 87 reserve_range(dev, res->start, res->end, 0); 88 } 89 } 90 91 static int system_pnp_probe(struct pnp_dev *dev, 92 const struct pnp_device_id *dev_id) 93 { 94 reserve_resources_of_dev(dev); 95 return 0; 96 } 97 98 static struct pnp_driver system_pnp_driver = { 99 .name = "system", 100 .id_table = pnp_dev_table, 101 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, 102 .probe = system_pnp_probe, 103 }; 104 105 static int __init pnp_system_init(void) 106 { 107 return pnp_register_driver(&system_pnp_driver); 108 } 109 110 /** 111 * Reserve motherboard resources after PCI claim BARs, 112 * but before PCI assign resources for uninitialized PCI devices 113 */ 114 fs_initcall(pnp_system_init); 115