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1 | /* |
2 | * rsrc_iodyn.c -- Resource management routines for MEM-static sockets. |
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/slab.h> |
16 | #include <linux/module.h> |
17 | #include <linux/kernel.h> |
18 | |
19 | #include <pcmcia/ss.h> |
20 | #include <pcmcia/cistpl.h> |
21 | #include "cs_internal.h" |
22 | |
23 | |
24 | struct pcmcia_align_data { |
25 | unsigned long mask; |
26 | unsigned long offset; |
27 | }; |
28 | |
29 | static resource_size_t pcmcia_align(void *align_data, |
30 | const struct resource *res, |
31 | resource_size_t size, resource_size_t align) |
32 | { |
33 | struct pcmcia_align_data *data = align_data; |
34 | resource_size_t start; |
35 | |
36 | start = (res->start & ~data->mask) + data->offset; |
37 | if (start < res->start) |
38 | start += data->mask + 1; |
39 | |
40 | #ifdef CONFIG_X86 |
41 | if (res->flags & IORESOURCE_IO) { |
42 | if (start & 0x300) |
43 | start = (start + 0x3ff) & ~0x3ff; |
44 | } |
45 | #endif |
46 | |
47 | #ifdef CONFIG_M68K |
48 | if (res->flags & IORESOURCE_IO) { |
49 | if ((res->start + size - 1) >= 1024) |
50 | start = res->end; |
51 | } |
52 | #endif |
53 | |
54 | return start; |
55 | } |
56 | |
57 | |
58 | static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s, |
59 | unsigned long base, int num, |
60 | unsigned long align) |
61 | { |
62 | struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO, |
63 | dev_name(&s->dev)); |
64 | struct pcmcia_align_data data; |
65 | unsigned long min = base; |
66 | int ret; |
67 | |
68 | data.mask = align - 1; |
69 | data.offset = base & data.mask; |
70 | |
71 | #ifdef CONFIG_PCI |
72 | if (s->cb_dev) { |
73 | ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1, |
74 | min, 0, pcmcia_align, &data); |
75 | } else |
76 | #endif |
77 | ret = allocate_resource(&ioport_resource, res, num, min, ~0UL, |
78 | 1, pcmcia_align, &data); |
79 | |
80 | if (ret != 0) { |
81 | kfree(res); |
82 | res = NULL; |
83 | } |
84 | return res; |
85 | } |
86 | |
87 | static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr, |
88 | unsigned int *base, unsigned int num, |
89 | unsigned int align, struct resource **parent) |
90 | { |
91 | int i, ret = 0; |
92 | |
93 | /* Check for an already-allocated window that must conflict with |
94 | * what was asked for. It is a hack because it does not catch all |
95 | * potential conflicts, just the most obvious ones. |
96 | */ |
97 | for (i = 0; i < MAX_IO_WIN; i++) { |
98 | if (!s->io[i].res) |
99 | continue; |
100 | |
101 | if (!*base) |
102 | continue; |
103 | |
104 | if ((s->io[i].res->start & (align-1)) == *base) |
105 | return -EBUSY; |
106 | } |
107 | |
108 | for (i = 0; i < MAX_IO_WIN; i++) { |
109 | struct resource *res = s->io[i].res; |
110 | unsigned int try; |
111 | |
112 | if (res && (res->flags & IORESOURCE_BITS) != |
113 | (attr & IORESOURCE_BITS)) |
114 | continue; |
115 | |
116 | if (!res) { |
117 | if (align == 0) |
118 | align = 0x10000; |
119 | |
120 | res = s->io[i].res = __iodyn_find_io_region(s, *base, |
121 | num, align); |
122 | if (!res) |
123 | return -EINVAL; |
124 | |
125 | *base = res->start; |
126 | s->io[i].res->flags = |
127 | ((res->flags & ~IORESOURCE_BITS) | |
128 | (attr & IORESOURCE_BITS)); |
129 | s->io[i].InUse = num; |
130 | *parent = res; |
131 | return 0; |
132 | } |
133 | |
134 | /* Try to extend top of window */ |
135 | try = res->end + 1; |
136 | if ((*base == 0) || (*base == try)) { |
137 | if (adjust_resource(s->io[i].res, res->start, |
138 | resource_size(res) + num)) |
139 | continue; |
140 | *base = try; |
141 | s->io[i].InUse += num; |
142 | *parent = res; |
143 | return 0; |
144 | } |
145 | |
146 | /* Try to extend bottom of window */ |
147 | try = res->start - num; |
148 | if ((*base == 0) || (*base == try)) { |
149 | if (adjust_resource(s->io[i].res, |
150 | res->start - num, |
151 | resource_size(res) + num)) |
152 | continue; |
153 | *base = try; |
154 | s->io[i].InUse += num; |
155 | *parent = res; |
156 | return 0; |
157 | } |
158 | } |
159 | |
160 | return -EINVAL; |
161 | } |
162 | |
163 | |
164 | struct pccard_resource_ops pccard_iodyn_ops = { |
165 | .validate_mem = NULL, |
166 | .find_io = iodyn_find_io, |
167 | .find_mem = NULL, |
168 | .init = static_init, |
169 | .exit = NULL, |
170 | }; |
171 | EXPORT_SYMBOL(pccard_iodyn_ops); |
172 |
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