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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>
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -07006 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
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 */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070019 {"PNP0c02", 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 /* memory controller */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070021 {"PNP0c01", 0},
22 {"", 0}
Linus Torvalds1da177e2005-04-16 15:20:36 -070023};
24
Bjorn Helgaasb933e192007-10-16 23:31:11 -070025static void reserve_range(struct pnp_dev *dev, resource_size_t start,
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070026 resource_size_t end, int port)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 char *regionid;
Kay Sieversc85e37c2009-01-06 10:44:38 -080029 const char *pnpid = dev_name(&dev->dev);
Bjorn Helgaasb933e192007-10-16 23:31:11 -070030 struct resource *res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32 regionid = kmalloc(16, GFP_KERNEL);
Bjorn Helgaasb933e192007-10-16 23:31:11 -070033 if (!regionid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 return;
Bjorn Helgaasb933e192007-10-16 23:31:11 -070035
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 snprintf(regionid, 16, "pnp %s", pnpid);
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -070037 if (port)
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070038 res = request_region(start, end - start + 1, regionid);
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -070039 else
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070040 res = request_mem_region(start, end - start + 1, regionid);
Bjorn Helgaasb933e192007-10-16 23:31:11 -070041 if (res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 res->flags &= ~IORESOURCE_BUSY;
Bjorn Helgaasb933e192007-10-16 23:31:11 -070043 else
44 kfree(regionid);
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 /*
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 */
Bjorn Helgaasb933e192007-10-16 23:31:11 -070051 dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n",
52 port ? "ioport" : "iomem",
53 (unsigned long long) start, (unsigned long long) end,
54 res ? "has been" : "could not be");
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Bjorn Helgaasb933e192007-10-16 23:31:11 -070057static void reserve_resources_of_dev(struct pnp_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060059 struct resource *res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 int i;
61
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060062 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
Bjorn Helgaasaee3ad82008-06-27 16:56:57 -060063 if (res->flags & IORESOURCE_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 continue;
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060065 if (res->start == 0)
Bjorn Helgaas58595542007-01-18 16:43:46 -070066 continue; /* disabled */
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060067 if (res->start < 0x100)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 /*
69 * Below 0x100 is only standard PC hardware
70 * (pics, kbd, timer, dma, ...)
71 * We should not get resource conflicts there,
72 * and the kernel reserves these anyway
73 * (see arch/i386/kernel/setup.c).
74 * So, do nothing
75 */
76 continue;
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060077 if (res->end < res->start)
Bjorn Helgaas58595542007-01-18 16:43:46 -070078 continue; /* invalid */
79
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060080 reserve_range(dev, res->start, res->end, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 }
82
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060083 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
Bjorn Helgaasaee3ad82008-06-27 16:56:57 -060084 if (res->flags & IORESOURCE_DISABLED)
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -070085 continue;
86
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060087 reserve_range(dev, res->start, res->end, 0);
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -070088 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
90
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070091static int system_pnp_probe(struct pnp_dev *dev,
92 const struct pnp_device_id *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 reserve_resources_of_dev(dev);
95 return 0;
96}
97
98static struct pnp_driver system_pnp_driver = {
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -070099 .name = "system",
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700100 .id_table = pnp_dev_table,
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700101 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
102 .probe = system_pnp_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103};
104
105static int __init pnp_system_init(void)
106{
107 return pnp_register_driver(&system_pnp_driver);
108}
109
110/**
111 * Reserve motherboard resources after PCI claim BARs,
112 * but before PCI assign resources for uninitialized PCI devices
113 */
114fs_initcall(pnp_system_init);