/* * system.c - a driver for reserving pnp system resources * * Some code is based on pnpbios_core.c * Copyright 2002 Adam Belay <ambx1@neo.rr.com> * (c) Copyright 2007 Hewlett-Packard Development Company, L.P. * Bjorn Helgaas <bjorn.helgaas@hp.com> */ #include <linux/pnp.h> #include <linux/device.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/ioport.h> static const struct pnp_device_id pnp_dev_table[] = { /* General ID for reserving resources */ {"PNP0c02", 0}, /* memory controller */ {"PNP0c01", 0}, {"", 0} }; static void reserve_range(struct pnp_dev *dev, resource_size_t start, resource_size_t end, int port) { char *regionid; const char *pnpid = dev->dev.bus_id; struct resource *res; regionid = kmalloc(16, GFP_KERNEL); if (!regionid) return; snprintf(regionid, 16, "pnp %s", pnpid); if (port) res = request_region(start, end - start + 1, regionid); else res = request_mem_region(start, end - start + 1, regionid); if (res) res->flags &= ~IORESOURCE_BUSY; else kfree(regionid); /* * Failures at this point are usually harmless. pci quirks for * example do reserve stuff they know about too, so we may well * have double reservations. */ dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n", port ? "ioport" : "iomem", (unsigned long long) start, (unsigned long long) end, res ? "has been" : "could not be"); } static void reserve_resources_of_dev(struct pnp_dev *dev) { int i; for (i = 0; i < PNP_MAX_PORT; i++) { if (!pnp_port_valid(dev, i)) continue; if (pnp_port_start(dev, i) == 0) continue; /* disabled */ if (pnp_port_start(dev, i) < 0x100) /* * Below 0x100 is only standard PC hardware * (pics, kbd, timer, dma, ...) * We should not get resource conflicts there, * and the kernel reserves these anyway * (see arch/i386/kernel/setup.c). * So, do nothing */ continue; if (pnp_port_end(dev, i) < pnp_port_start(dev, i)) continue; /* invalid */ reserve_range(dev, pnp_port_start(dev, i), pnp_port_end(dev, i), 1); } for (i = 0; i < PNP_MAX_MEM; i++) { if (!pnp_mem_valid(dev, i)) continue; reserve_range(dev, pnp_mem_start(dev, i), pnp_mem_end(dev, i), 0); } } static int system_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { reserve_resources_of_dev(dev); return 0; } static struct pnp_driver system_pnp_driver = { .name = "system", .id_table = pnp_dev_table, .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, .probe = system_pnp_probe, }; static int __init pnp_system_init(void) { return pnp_register_driver(&system_pnp_driver); } /** * Reserve motherboard resources after PCI claim BARs, * but before PCI assign resources for uninitialized PCI devices */ fs_initcall(pnp_system_init);