Root/drivers/pnp/system.c

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 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
8 */
9
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>
16
17static const struct pnp_device_id pnp_dev_table[] = {
18    /* General ID for reserving resources */
19    {"PNP0c02", 0},
20    /* memory controller */
21    {"PNP0c01", 0},
22    {"", 0}
23};
24
25static void reserve_range(struct pnp_dev *dev, struct resource *r, int port)
26{
27    char *regionid;
28    const char *pnpid = dev_name(&dev->dev);
29    resource_size_t start = r->start, end = r->end;
30    struct resource *res;
31
32    regionid = kmalloc(16, GFP_KERNEL);
33    if (!regionid)
34        return;
35
36    snprintf(regionid, 16, "pnp %s", pnpid);
37    if (port)
38        res = request_region(start, end - start + 1, regionid);
39    else
40        res = request_mem_region(start, end - start + 1, regionid);
41    if (res)
42        res->flags &= ~IORESOURCE_BUSY;
43    else
44        kfree(regionid);
45
46    /*
47     * Failures at this point are usually harmless. pci quirks for
48     * example do reserve stuff they know about too, so we may well
49     * have double reservations.
50     */
51    dev_info(&dev->dev, "%pR %s reserved\n", r,
52         res ? "has been" : "could not be");
53}
54
55static void reserve_resources_of_dev(struct pnp_dev *dev)
56{
57    struct resource *res;
58    int i;
59
60    for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
61        if (res->flags & IORESOURCE_DISABLED)
62            continue;
63        if (res->start == 0)
64            continue; /* disabled */
65        if (res->start < 0x100)
66            /*
67             * Below 0x100 is only standard PC hardware
68             * (pics, kbd, timer, dma, ...)
69             * We should not get resource conflicts there,
70             * and the kernel reserves these anyway
71             * (see arch/i386/kernel/setup.c).
72             * So, do nothing
73             */
74            continue;
75        if (res->end < res->start)
76            continue; /* invalid */
77
78        reserve_range(dev, res, 1);
79    }
80
81    for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
82        if (res->flags & IORESOURCE_DISABLED)
83            continue;
84
85        reserve_range(dev, res, 0);
86    }
87}
88
89static int system_pnp_probe(struct pnp_dev *dev,
90                const struct pnp_device_id *dev_id)
91{
92    reserve_resources_of_dev(dev);
93    return 0;
94}
95
96static struct pnp_driver system_pnp_driver = {
97    .name = "system",
98    .id_table = pnp_dev_table,
99    .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
100    .probe = system_pnp_probe,
101};
102
103static int __init pnp_system_init(void)
104{
105    return pnp_register_driver(&system_pnp_driver);
106}
107
108/**
109 * Reserve motherboard resources after PCI claim BARs,
110 * but before PCI assign resources for uninitialized PCI devices
111 */
112fs_initcall(pnp_system_init);
113

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