14ffe68a094ec044aeceaff4b2b8f3695a7f9448
[sfrench/cifs-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  * 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  */
51 static 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->type == ACPI_RESOURCE_TYPE_IO) {
58                 struct acpi_resource_io *io_res = &res->data.io;
59
60                 if (io_res->minimum != io_res->maximum)
61                         return_VALUE(AE_OK);
62                 if (IS_RESERVED_ADDR
63                     (io_res->minimum, io_res->address_length)) {
64                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
65                                           "Motherboard resources 0x%08x - 0x%08x\n",
66                                           io_res->minimum,
67                                           io_res->minimum +
68                                           io_res->address_length));
69                         requested_res =
70                             request_region(io_res->minimum,
71                                            io_res->address_length, "motherboard");
72                 }
73         } else if (res->type == ACPI_RESOURCE_TYPE_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->address, fixed_io_res->address_length)) {
79                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
80                                           "Motherboard resources 0x%08x - 0x%08x\n",
81                                           fixed_io_res->address,
82                                           fixed_io_res->address +
83                                           fixed_io_res->address_length));
84                         requested_res =
85                             request_region(fixed_io_res->address,
86                                            fixed_io_res->address_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
98 static 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
108 static 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
117 static 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
126 static void __init acpi_request_region (struct acpi_generic_address *addr,
127         unsigned int length, char *desc)
128 {
129         if (!addr->address || !length)
130                 return;
131
132         if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
133                 request_region(addr->address, length, desc);
134         else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
135                 request_mem_region(addr->address, length, desc);
136 }
137
138 static void __init acpi_reserve_resources(void)
139 {
140         acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
141                                acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
142
143         acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
144                                acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
145
146         acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
147                                acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
148
149         acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
150                                acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
151
152         if (acpi_gbl_FADT->pm_tm_len == 4)
153                 acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "PM_TMR");
154
155         acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
156                                acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
157
158         /* Length of GPE blocks must be a non-negative multiple of 2 */
159
160         if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
161                 acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
162                                acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
163
164         if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
165                 acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
166                                acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
167 }
168
169 static int __init acpi_motherboard_init(void)
170 {
171         acpi_bus_register_driver(&acpi_motherboard_driver1);
172         acpi_bus_register_driver(&acpi_motherboard_driver2);
173         /* 
174          * Guarantee motherboard IO reservation first
175          * This module must run after scan.c
176          */
177         if (!acpi_disabled)
178                 acpi_reserve_resources();
179         return 0;
180 }
181
182 /**
183  * Reserve motherboard resources after PCI claim BARs,
184  * but before PCI assign resources for uninitialized PCI devices
185  */
186 fs_initcall(acpi_motherboard_init);