2 * system.c - a driver for reserving pnp system resources
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>
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>
17 static const struct pnp_device_id pnp_dev_table[] = {
18 /* General ID for reserving resources */
20 /* memory controller */
25 static void reserve_range(const char *pnpid, resource_size_t start,
26 resource_size_t end, int port)
31 regionid = kmalloc(16, GFP_KERNEL);
34 snprintf(regionid, 16, "pnp %s", pnpid);
36 res = request_region(start, end - start + 1, regionid);
38 res = request_mem_region(start, end - start + 1, regionid);
42 res->flags &= ~IORESOURCE_BUSY;
44 * Failures at this point are usually harmless. pci quirks for
45 * example do reserve stuff they know about too, so we may well
46 * have double reservations.
49 "pnp: %s: %s range 0x%llx-0x%llx %s reserved\n",
50 pnpid, port ? "ioport" : "iomem",
51 (unsigned long long)start, (unsigned long long)end,
52 NULL != res ? "has been" : "could not be");
55 static void reserve_resources_of_dev(const struct pnp_dev *dev)
59 for (i = 0; i < PNP_MAX_PORT; i++) {
60 if (!pnp_port_valid(dev, i))
62 if (pnp_port_start(dev, i) == 0)
63 continue; /* disabled */
64 if (pnp_port_start(dev, i) < 0x100)
66 * Below 0x100 is only standard PC hardware
67 * (pics, kbd, timer, dma, ...)
68 * We should not get resource conflicts there,
69 * and the kernel reserves these anyway
70 * (see arch/i386/kernel/setup.c).
74 if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
75 continue; /* invalid */
77 reserve_range(dev->dev.bus_id, pnp_port_start(dev, i),
78 pnp_port_end(dev, i), 1);
81 for (i = 0; i < PNP_MAX_MEM; i++) {
82 if (!pnp_mem_valid(dev, i))
85 reserve_range(dev->dev.bus_id, pnp_mem_start(dev, i),
86 pnp_mem_end(dev, i), 0);
92 static int system_pnp_probe(struct pnp_dev *dev,
93 const struct pnp_device_id *dev_id)
95 reserve_resources_of_dev(dev);
99 static struct pnp_driver system_pnp_driver = {
101 .id_table = pnp_dev_table,
102 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
103 .probe = system_pnp_probe,
107 static int __init pnp_system_init(void)
109 return pnp_register_driver(&system_pnp_driver);
113 * Reserve motherboard resources after PCI claim BARs,
114 * but before PCI assign resources for uninitialized PCI devices
116 fs_initcall(pnp_system_init);