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/**
40 * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
41 * Doesn't care about the failure of 'request_region', since other may reserve
42 * the io ports as well
43 */
44#define IS_RESERVED_ADDR(base, len) \
45 (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
46 && ((base) + (len) > PCIBIOS_MIN_IO))
47
48/*
49 * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
50 * the io ports if they really know they can use it, while
51 * still preventing hotplug PCI devices from using it.
52 */
53
54static acpi_status
55acpi_reserve_io_ranges (struct acpi_resource *res, void *data)
56{
57 struct resource *requested_res = NULL;
58
59 ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges");
60
61 if (res->id == ACPI_RSTYPE_IO) {
62 struct acpi_resource_io *io_res = &res->data.io;
63
64 if (io_res->min_base_address != io_res->max_base_address)
65 return_VALUE(AE_OK);
66 if (IS_RESERVED_ADDR(io_res->min_base_address, io_res->range_length)) {
67 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
68 io_res->min_base_address,
69 io_res->min_base_address + io_res->range_length));
70 requested_res = 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 = &res->data.fixed_io;
75
76 if (IS_RESERVED_ADDR(fixed_io_res->base_address, fixed_io_res->range_length)) {
77 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n",
78 fixed_io_res->base_address,
79 fixed_io_res->base_address + fixed_io_res->range_length));
80 requested_res = request_region(fixed_io_res->base_address,
81 fixed_io_res->range_length, "motherboard");
82 }
83 } else {
84 /* Memory mapped IO? */
85 }
86
87 if (requested_res)
88 requested_res->flags &= ~IORESOURCE_BUSY;
89 return_VALUE(AE_OK);
90}
91
92static int acpi_motherboard_add (struct acpi_device *device)
93{
94 if (!device)
95 return -EINVAL;
96 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
97 acpi_reserve_io_ranges, NULL);
98
99 return 0;
100}
101
102static struct acpi_driver acpi_motherboard_driver1 = {
103 .name = "motherboard",
104 .class = "",
105 .ids = ACPI_MB_HID1,
106 .ops = {
107 .add = acpi_motherboard_add,
108 },
109};
110
111static struct acpi_driver acpi_motherboard_driver2 = {
112 .name = "motherboard",
113 .class = "",
114 .ids = ACPI_MB_HID2,
115 .ops = {
116 .add = acpi_motherboard_add,
117 },
118};
119
120static void __init
121acpi_reserve_resources (void)
122{
123 if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
124 request_region(acpi_gbl_FADT->xpm1a_evt_blk.address,
125 acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
126
127 if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
128 request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
129 acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
130
131 if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
132 request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address,
133 acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
134
135 if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
136 request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address,
137 acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
138
139 if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
140 request_region(acpi_gbl_FADT->xpm_tmr_blk.address,
141 4, "PM_TMR");
142
143 if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
144 request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
145 acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
146
147 /* Length of GPE blocks must be a non-negative multiple of 2 */
148
149 if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
150 !(acpi_gbl_FADT->gpe0_blk_len & 0x1))
151 request_region(acpi_gbl_FADT->xgpe0_blk.address,
152 acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
153
154 if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
155 !(acpi_gbl_FADT->gpe1_blk_len & 0x1))
156 request_region(acpi_gbl_FADT->xgpe1_blk.address,
157 acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
158}
159
160static int __init acpi_motherboard_init(void)
161{
162 acpi_bus_register_driver(&acpi_motherboard_driver1);
163 acpi_bus_register_driver(&acpi_motherboard_driver2);
164 /*
165 * Guarantee motherboard IO reservation first
166 * This module must run after scan.c
167 */
168 if (!acpi_disabled)
169 acpi_reserve_resources ();
170 return 0;
171}
172
173/**
174 * Reserve motherboard resources after PCI claim BARs,
175 * but before PCI assign resources for uninitialized PCI devices
176 */
177fs_initcall(acpi_motherboard_init);