blob: d42015c382af5aa7fd106081403c490ad3673317 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
7 */
8
9#include <linux/pnp.h>
10#include <linux/device.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/kernel.h>
14#include <linux/ioport.h>
15
16static const struct pnp_device_id pnp_dev_table[] = {
17 /* General ID for reserving resources */
18 { "PNP0c02", 0 },
19 /* memory controller */
20 { "PNP0c01", 0 },
21 { "", 0 }
22};
23
24static void reserve_ioport_range(char *pnpid, int start, int end)
25{
26 struct resource *res;
27 char *regionid;
28
29 regionid = kmalloc(16, GFP_KERNEL);
30 if ( regionid == NULL )
31 return;
32 snprintf(regionid, 16, "pnp %s", pnpid);
33 res = request_region(start,end-start+1,regionid);
34 if ( res == NULL )
35 kfree( regionid );
36 else
37 res->flags &= ~IORESOURCE_BUSY;
38 /*
39 * Failures at this point are usually harmless. pci quirks for
40 * example do reserve stuff they know about too, so we may well
41 * have double reservations.
42 */
43 printk(KERN_INFO
44 "pnp: %s: ioport range 0x%x-0x%x %s reserved\n",
45 pnpid, start, end,
46 NULL != res ? "has been" : "could not be"
47 );
48
49 return;
50}
51
52static void reserve_resources_of_dev( struct pnp_dev *dev )
53{
54 int i;
55
56 for (i=0;i<PNP_MAX_PORT;i++) {
57 if (!pnp_port_valid(dev, i))
58 /* end of resources */
59 continue;
60 if (pnp_port_start(dev, i) == 0)
61 /* disabled */
62 /* Do nothing */
63 continue;
64 if (pnp_port_start(dev, i) < 0x100)
65 /*
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).
71 * So, do nothing
72 */
73 continue;
74 if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
75 /* invalid endpoint */
76 /* Do nothing */
77 continue;
78 reserve_ioport_range(
79 dev->dev.bus_id,
80 pnp_port_start(dev, i),
81 pnp_port_end(dev, i)
82 );
83 }
84
85 return;
86}
87
88static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
89{
90 reserve_resources_of_dev(dev);
91 return 0;
92}
93
94static struct pnp_driver system_pnp_driver = {
95 .name = "system",
96 .id_table = pnp_dev_table,
97 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
98 .probe = system_pnp_probe,
99 .remove = NULL,
100};
101
102static int __init pnp_system_init(void)
103{
104 return pnp_register_driver(&system_pnp_driver);
105}
106
107/**
108 * Reserve motherboard resources after PCI claim BARs,
109 * but before PCI assign resources for uninitialized PCI devices
110 */
111fs_initcall(pnp_system_init);