tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or (at
6 * your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18 */
19
20/* Purpose: Prevent PCMCIA cards from using motherboard resources. */
21
22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/types.h>
25#include <linux/pci.h>
26#include <linux/ioport.h>
27#include <asm/io.h>
28
29#include <acpi/acpi_bus.h>
30#include <acpi/acpi_drivers.h>
31
32#define _COMPONENT ACPI_SYSTEM_COMPONENT
33ACPI_MODULE_NAME("acpi_motherboard")
34
35/* Dell use PNP0C01 instead of PNP0C02 */
36#define ACPI_MB_HID1 "PNP0C01"
37#define ACPI_MB_HID2 "PNP0C02"
38/**
39 * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
40 * Doesn't care about the failure of 'request_region', since other may reserve
41 * the io ports as well
42 */
43#define IS_RESERVED_ADDR(base, len) \
44 (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
45 && ((base) + (len) > PCIBIOS_MIN_IO))
46/*
47 * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
48 * the io ports if they really know they can use it, while
49 * still preventing hotplug PCI devices from using it.
50 */
51static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
52{
53 struct resource *requested_res = NULL;
54
55 ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges");
56
57 if (res->id == ACPI_RSTYPE_IO) {
58 struct acpi_resource_io *io_res = &res->data.io;
59
60 if (io_res->min_base_address != io_res->max_base_address)
61 return_VALUE(AE_OK);
62 if (IS_RESERVED_ADDR
63 (io_res->min_base_address, io_res->range_length)) {
64 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
65 "Motherboard resources 0x%08x - 0x%08x\n",
66 io_res->min_base_address,
67 io_res->min_base_address +
68 io_res->range_length));
69 requested_res =
70 request_region(io_res->min_base_address,
71 io_res->range_length, "motherboard");
72 }
73 } else if (res->id == ACPI_RSTYPE_FIXED_IO) {
74 struct acpi_resource_fixed_io *fixed_io_res =
75 &res->data.fixed_io;
76
77 if (IS_RESERVED_ADDR
78 (fixed_io_res->base_address, fixed_io_res->range_length)) {
79 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
80 "Motherboard resources 0x%08x - 0x%08x\n",
81 fixed_io_res->base_address,
82 fixed_io_res->base_address +
83 fixed_io_res->range_length));
84 requested_res =
85 request_region(fixed_io_res->base_address,
86 fixed_io_res->range_length,
87 "motherboard");
88 }
89 } else {
90 /* Memory mapped IO? */
91 }
92
93 if (requested_res)
94 requested_res->flags &= ~IORESOURCE_BUSY;
95 return_VALUE(AE_OK);
96}
97
98static int acpi_motherboard_add(struct acpi_device *device)
99{
100 if (!device)
101 return -EINVAL;
102 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
103 acpi_reserve_io_ranges, NULL);
104
105 return 0;
106}
107
108static struct acpi_driver acpi_motherboard_driver1 = {
109 .name = "motherboard",
110 .class = "",
111 .ids = ACPI_MB_HID1,
112 .ops = {
113 .add = acpi_motherboard_add,
114 },
115};
116
117static struct acpi_driver acpi_motherboard_driver2 = {
118 .name = "motherboard",
119 .class = "",
120 .ids = ACPI_MB_HID2,
121 .ops = {
122 .add = acpi_motherboard_add,
123 },
124};
125
126static void __init acpi_reserve_resources(void)
127{
128 if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
129 request_region(acpi_gbl_FADT->xpm1a_evt_blk.address,
130 acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
131
132 if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
133 request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
134 acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
135
136 if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
137 request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address,
138 acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
139
140 if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
141 request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address,
142 acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
143
144 if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
145 request_region(acpi_gbl_FADT->xpm_tmr_blk.address, 4, "PM_TMR");
146
147 if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
148 request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
149 acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
150
151 /* Length of GPE blocks must be a non-negative multiple of 2 */
152
153 if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
154 !(acpi_gbl_FADT->gpe0_blk_len & 0x1))
155 request_region(acpi_gbl_FADT->xgpe0_blk.address,
156 acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
157
158 if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
159 !(acpi_gbl_FADT->gpe1_blk_len & 0x1))
160 request_region(acpi_gbl_FADT->xgpe1_blk.address,
161 acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
162}
163
164static int __init acpi_motherboard_init(void)
165{
166 acpi_bus_register_driver(&acpi_motherboard_driver1);
167 acpi_bus_register_driver(&acpi_motherboard_driver2);
168 /*
169 * Guarantee motherboard IO reservation first
170 * This module must run after scan.c
171 */
172 if (!acpi_disabled)
173 acpi_reserve_resources();
174 return 0;
175}
176
177/**
178 * Reserve motherboard resources after PCI claim BARs,
179 * but before PCI assign resources for uninitialized PCI devices
180 */
181fs_initcall(acpi_motherboard_init);