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(char *pnpid, int start, int end, int port) 26 { 27 struct resource *res; 28 char *regionid; 29 30 regionid = kmalloc(16, GFP_KERNEL); 31 if (regionid == NULL) 32 return; 33 snprintf(regionid, 16, "pnp %s", pnpid); 34 if (port) 35 res = request_region(start,end-start+1,regionid); 36 else 37 res = request_mem_region(start,end-start+1,regionid); 38 if (res == NULL) 39 kfree(regionid); 40 else 41 res->flags &= ~IORESOURCE_BUSY; 42 /* 43 * Failures at this point are usually harmless. pci quirks for 44 * example do reserve stuff they know about too, so we may well 45 * have double reservations. 46 */ 47 printk(KERN_INFO 48 "pnp: %s: %s range 0x%x-0x%x %s reserved\n", 49 pnpid, port ? "ioport" : "iomem", start, end, 50 NULL != res ? "has been" : "could not be"); 51 } 52 53 static void reserve_resources_of_dev(struct pnp_dev *dev) 54 { 55 int i; 56 57 for (i = 0; i < PNP_MAX_PORT; i++) { 58 if (!pnp_port_valid(dev, i)) 59 continue; 60 if (pnp_port_start(dev, i) == 0) 61 continue; /* disabled */ 62 if (pnp_port_start(dev, i) < 0x100) 63 /* 64 * Below 0x100 is only standard PC hardware 65 * (pics, kbd, timer, dma, ...) 66 * We should not get resource conflicts there, 67 * and the kernel reserves these anyway 68 * (see arch/i386/kernel/setup.c). 69 * So, do nothing 70 */ 71 continue; 72 if (pnp_port_end(dev, i) < pnp_port_start(dev, i)) 73 continue; /* invalid */ 74 75 reserve_range(dev->dev.bus_id, pnp_port_start(dev, i), 76 pnp_port_end(dev, i), 1); 77 } 78 79 for (i = 0; i < PNP_MAX_MEM; i++) { 80 if (!pnp_mem_valid(dev, i)) 81 continue; 82 83 reserve_range(dev->dev.bus_id, pnp_mem_start(dev, i), 84 pnp_mem_end(dev, i), 0); 85 } 86 87 return; 88 } 89 90 static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id) 91 { 92 reserve_resources_of_dev(dev); 93 return 0; 94 } 95 96 static struct pnp_driver system_pnp_driver = { 97 .name = "system", 98 .id_table = pnp_dev_table, 99 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, 100 .probe = system_pnp_probe, 101 .remove = NULL, 102 }; 103 104 static int __init pnp_system_init(void) 105 { 106 return pnp_register_driver(&system_pnp_driver); 107 } 108 109 /** 110 * Reserve motherboard resources after PCI claim BARs, 111 * but before PCI assign resources for uninitialized PCI devices 112 */ 113 fs_initcall(pnp_system_init); 114