[PATCH] ACPI: increase PCIBIOS_MIN_IO on x86
[linux-2.6.git] / drivers / acpi / motherboard.c
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
33 ACPI_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) > 0x1000))
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
54 static acpi_status
55 acpi_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
92 static 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
102 static 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
111 static 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
120 static void __init
121 acpi_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
160 static 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  */
177 fs_initcall(acpi_motherboard_init);