Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * | |
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 | ||
16 | static 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 | ||
24 | static 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 | ||
52 | static 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 | ||
88 | static 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 | ||
94 | static 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 | ||
102 | static 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 | */ | |
111 | fs_initcall(pnp_system_init); |