b6843f8d300d20a3d6d5f503917fbd0229685f2b
[linux-2.6.git] / drivers / pcmcia / rsrc_mgr.c
1 /*
2  * rsrc_mgr.c -- Resource management routines and/or wrappers
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * The initial developer of the original code is David A. Hinds
9  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
10  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
11  *
12  * (C) 1999             David A. Hinds
13  */
14
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18
19 #include <pcmcia/cs_types.h>
20 #include <pcmcia/ss.h>
21 #include <pcmcia/cs.h>
22 #include "cs_internal.h"
23
24
25 #ifdef CONFIG_PCMCIA_PROBE
26
27 static int adjust_irq(struct pcmcia_socket *s, adjust_t *adj)
28 {
29         int irq;
30         u32 mask;
31
32         irq = adj->resource.irq.IRQ;
33         if ((irq < 0) || (irq > 15))
34                 return CS_BAD_IRQ;
35
36         if (adj->Action != REMOVE_MANAGED_RESOURCE)
37                 return 0;
38
39         mask = 1 << irq;
40
41         if (!(s->irq_mask & mask))
42                 return 0;
43
44         s->irq_mask &= ~mask;
45
46         return 0;
47 }
48
49 #else
50
51 static inline int adjust_irq(struct pcmcia_socket *s, adjust_t *adj) {
52         return CS_SUCCESS;
53 }
54
55 #endif
56
57
58 int pcmcia_adjust_resource_info(adjust_t *adj)
59 {
60         struct pcmcia_socket *s;
61         int ret = CS_UNSUPPORTED_FUNCTION;
62         unsigned long flags;
63
64         down_read(&pcmcia_socket_list_rwsem);
65         list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
66
67                 if (adj->Resource == RES_IRQ)
68                         ret = adjust_irq(s, adj);
69
70                 else if (s->resource_ops->adjust_resource) {
71
72                         /* you can't use the old interface if the new
73                          * one was used before */
74                         spin_lock_irqsave(&s->lock, flags);
75                         if ((s->resource_setup_done) &&
76                             !(s->resource_setup_old)) {
77                                 spin_unlock_irqrestore(&s->lock, flags);
78                                 continue;
79                         } else if (!(s->resource_setup_old))
80                                 s->resource_setup_old = 1;
81                         spin_unlock_irqrestore(&s->lock, flags);
82
83                         ret = s->resource_ops->adjust_resource(s, adj);
84                         if (!ret) {
85                                 /* as there's no way we know this is the
86                                  * last call to adjust_resource_info, we
87                                  * always need to assume this is the latest
88                                  * one... */
89                                 spin_lock_irqsave(&s->lock, flags);
90                                 s->resource_setup_done = 1;
91                                 spin_unlock_irqrestore(&s->lock, flags);
92                         }
93                 }
94         }
95         up_read(&pcmcia_socket_list_rwsem);
96
97         return (ret);
98 }
99 EXPORT_SYMBOL(pcmcia_adjust_resource_info);
100
101 void pcmcia_validate_mem(struct pcmcia_socket *s)
102 {
103         if (s->resource_ops->validate_mem)
104                 s->resource_ops->validate_mem(s);
105 }
106 EXPORT_SYMBOL(pcmcia_validate_mem);
107
108 int adjust_io_region(struct resource *res, unsigned long r_start,
109                      unsigned long r_end, struct pcmcia_socket *s)
110 {
111         if (s->resource_ops->adjust_io_region)
112                 return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
113         return -ENOMEM;
114 }
115
116 struct resource *find_io_region(unsigned long base, int num,
117                    unsigned long align, struct pcmcia_socket *s)
118 {
119         if (s->resource_ops->find_io)
120                 return s->resource_ops->find_io(base, num, align, s);
121         return NULL;
122 }
123
124 struct resource *find_mem_region(u_long base, u_long num, u_long align,
125                                  int low, struct pcmcia_socket *s)
126 {
127         if (s->resource_ops->find_mem)
128                 return s->resource_ops->find_mem(base, num, align, low, s);
129         return NULL;
130 }
131
132 void release_resource_db(struct pcmcia_socket *s)
133 {
134         if (s->resource_ops->exit)
135                 s->resource_ops->exit(s);
136 }
137
138
139 static int static_init(struct pcmcia_socket *s)
140 {
141         unsigned long flags;
142
143         /* the good thing about SS_CAP_STATIC_MAP sockets is
144          * that they don't need a resource database */
145
146         spin_lock_irqsave(&s->lock, flags);
147         s->resource_setup_done = 1;
148         spin_unlock_irqrestore(&s->lock, flags);
149
150         return 0;
151 }
152
153
154 struct pccard_resource_ops pccard_static_ops = {
155         .validate_mem = NULL,
156         .adjust_io_region = NULL,
157         .find_io = NULL,
158         .find_mem = NULL,
159         .adjust_resource = NULL,
160         .init = static_init,
161         .exit = NULL,
162 };
163 EXPORT_SYMBOL(pccard_static_ops);