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linux
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drivers
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pnp
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system.c
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linux
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system.c
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/* * 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, struct resource *r, int port) { char *regionid; const char *pnpid = dev_name(&dev->dev); resource_size_t start = r->start, end = r->end; 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, "%pR %s reserved\n", r, res ? "has been" : "could not be"); } static void reserve_resources_of_dev(struct pnp_dev *dev) { struct resource *res; int i; for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) { if (res->flags & IORESOURCE_DISABLED) continue; if (res->start == 0) continue; /* disabled */ if (res->start < 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 (res->end < res->start) continue; /* invalid */ reserve_range(dev, res, 1); } for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) { if (res->flags & IORESOURCE_DISABLED) continue; reserve_range(dev, res, 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);
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