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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
Rafael J. Wysocki0f1b4142015-06-18 18:32:02 +020010#include <linux/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/pnp.h>
12#include <linux/device.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/kernel.h>
16#include <linux/ioport.h>
17
18static const struct pnp_device_id pnp_dev_table[] = {
19 /* General ID for reserving resources */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070020 {"PNP0c02", 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 /* memory controller */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070022 {"PNP0c01", 0},
23 {"", 0}
Linus Torvalds1da177e2005-04-16 15:20:36 -070024};
25
Rafael J. Wysocki0f1b4142015-06-18 18:32:02 +020026#ifdef CONFIG_ACPI
27static bool __reserve_range(u64 start, unsigned int length, bool io, char *desc)
28{
29 u8 space_id = io ? ACPI_ADR_SPACE_SYSTEM_IO : ACPI_ADR_SPACE_SYSTEM_MEMORY;
30 return !acpi_reserve_region(start, length, space_id, IORESOURCE_BUSY, desc);
31}
32#else
33static bool __reserve_range(u64 start, unsigned int length, bool io, char *desc)
34{
35 struct resource *res;
36
37 res = io ? request_region(start, length, desc) :
38 request_mem_region(start, length, desc);
39 if (res) {
40 res->flags &= ~IORESOURCE_BUSY;
41 return true;
42 }
43 return false;
44}
45#endif
46
Bjorn Helgaas9a007b32009-10-06 15:34:00 -060047static void reserve_range(struct pnp_dev *dev, struct resource *r, int port)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 char *regionid;
Kay Sieversc85e37c2009-01-06 10:44:38 -080050 const char *pnpid = dev_name(&dev->dev);
Bjorn Helgaas9a007b32009-10-06 15:34:00 -060051 resource_size_t start = r->start, end = r->end;
Rafael J. Wysocki0f1b4142015-06-18 18:32:02 +020052 bool reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 regionid = kmalloc(16, GFP_KERNEL);
Bjorn Helgaasb933e192007-10-16 23:31:11 -070055 if (!regionid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 return;
Bjorn Helgaasb933e192007-10-16 23:31:11 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 snprintf(regionid, 16, "pnp %s", pnpid);
Rafael J. Wysocki0f1b4142015-06-18 18:32:02 +020059 reserved = __reserve_range(start, end - start + 1, !!port, regionid);
60 if (!reserved)
Bjorn Helgaasb933e192007-10-16 23:31:11 -070061 kfree(regionid);
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 /*
64 * Failures at this point are usually harmless. pci quirks for
65 * example do reserve stuff they know about too, so we may well
66 * have double reservations.
67 */
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -060068 dev_info(&dev->dev, "%pR %s reserved\n", r,
Rafael J. Wysocki0f1b4142015-06-18 18:32:02 +020069 reserved ? "has been" : "could not be");
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
Bjorn Helgaasb933e192007-10-16 23:31:11 -070072static void reserve_resources_of_dev(struct pnp_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060074 struct resource *res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 int i;
76
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060077 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
Bjorn Helgaasaee3ad82008-06-27 16:56:57 -060078 if (res->flags & IORESOURCE_DISABLED)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 continue;
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060080 if (res->start == 0)
Bjorn Helgaas58595542007-01-18 16:43:46 -070081 continue; /* disabled */
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060082 if (res->start < 0x100)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 /*
84 * Below 0x100 is only standard PC hardware
85 * (pics, kbd, timer, dma, ...)
86 * We should not get resource conflicts there,
87 * and the kernel reserves these anyway
88 * (see arch/i386/kernel/setup.c).
89 * So, do nothing
90 */
91 continue;
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060092 if (res->end < res->start)
Bjorn Helgaas58595542007-01-18 16:43:46 -070093 continue; /* invalid */
94
Bjorn Helgaas9a007b32009-10-06 15:34:00 -060095 reserve_range(dev, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
97
Bjorn Helgaas95ab3662008-04-28 16:34:26 -060098 for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
Bjorn Helgaasaee3ad82008-06-27 16:56:57 -060099 if (res->flags & IORESOURCE_DISABLED)
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -0700100 continue;
101
Bjorn Helgaas9a007b32009-10-06 15:34:00 -0600102 reserve_range(dev, res, 0);
Bjorn Helgaasa8c78f72007-01-18 16:43:27 -0700103 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700106static int system_pnp_probe(struct pnp_dev *dev,
107 const struct pnp_device_id *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 reserve_resources_of_dev(dev);
110 return 0;
111}
112
113static struct pnp_driver system_pnp_driver = {
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700114 .name = "system",
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700115 .id_table = pnp_dev_table,
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700116 .flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
117 .probe = system_pnp_probe,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118};
119
120static int __init pnp_system_init(void)
121{
122 return pnp_register_driver(&system_pnp_driver);
123}
124
125/**
126 * Reserve motherboard resources after PCI claim BARs,
127 * but before PCI assign resources for uninitialized PCI devices
128 */
129fs_initcall(pnp_system_init);