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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
49b1153a DB |
2 | /* |
3 | * rsrc_iodyn.c -- Resource management routines for MEM-static sockets. | |
4 | * | |
49b1153a DB |
5 | * The initial developer of the original code is David A. Hinds |
6 | * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds | |
7 | * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. | |
8 | * | |
9 | * (C) 1999 David A. Hinds | |
10 | */ | |
11 | ||
6d59622e | 12 | #include <linux/slab.h> |
49b1153a DB |
13 | #include <linux/module.h> |
14 | #include <linux/kernel.h> | |
15 | ||
49b1153a | 16 | #include <pcmcia/ss.h> |
49b1153a DB |
17 | #include <pcmcia/cistpl.h> |
18 | #include "cs_internal.h" | |
19 | ||
20 | ||
21 | struct pcmcia_align_data { | |
22 | unsigned long mask; | |
23 | unsigned long offset; | |
24 | }; | |
25 | ||
26 | static resource_size_t pcmcia_align(void *align_data, | |
27 | const struct resource *res, | |
28 | resource_size_t size, resource_size_t align) | |
29 | { | |
30 | struct pcmcia_align_data *data = align_data; | |
31 | resource_size_t start; | |
32 | ||
33 | start = (res->start & ~data->mask) + data->offset; | |
34 | if (start < res->start) | |
35 | start += data->mask + 1; | |
36 | ||
37 | #ifdef CONFIG_X86 | |
38 | if (res->flags & IORESOURCE_IO) { | |
39 | if (start & 0x300) | |
40 | start = (start + 0x3ff) & ~0x3ff; | |
41 | } | |
42 | #endif | |
43 | ||
44 | #ifdef CONFIG_M68K | |
45 | if (res->flags & IORESOURCE_IO) { | |
46 | if ((res->start + size - 1) >= 1024) | |
47 | start = res->end; | |
48 | } | |
49 | #endif | |
50 | ||
51 | return start; | |
52 | } | |
53 | ||
54 | ||
b19a7275 DB |
55 | static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s, |
56 | unsigned long base, int num, | |
57 | unsigned long align) | |
49b1153a DB |
58 | { |
59 | struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO, | |
60 | dev_name(&s->dev)); | |
61 | struct pcmcia_align_data data; | |
62 | unsigned long min = base; | |
63 | int ret; | |
64 | ||
49b1153a DB |
65 | data.mask = align - 1; |
66 | data.offset = base & data.mask; | |
67 | ||
68 | #ifdef CONFIG_PCI | |
69 | if (s->cb_dev) { | |
70 | ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1, | |
71 | min, 0, pcmcia_align, &data); | |
72 | } else | |
73 | #endif | |
74 | ret = allocate_resource(&ioport_resource, res, num, min, ~0UL, | |
75 | 1, pcmcia_align, &data); | |
76 | ||
77 | if (ret != 0) { | |
78 | kfree(res); | |
79 | res = NULL; | |
80 | } | |
81 | return res; | |
82 | } | |
83 | ||
b19a7275 DB |
84 | static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr, |
85 | unsigned int *base, unsigned int num, | |
ad0c7be2 | 86 | unsigned int align, struct resource **parent) |
b19a7275 DB |
87 | { |
88 | int i, ret = 0; | |
89 | ||
90 | /* Check for an already-allocated window that must conflict with | |
91 | * what was asked for. It is a hack because it does not catch all | |
92 | * potential conflicts, just the most obvious ones. | |
93 | */ | |
94 | for (i = 0; i < MAX_IO_WIN; i++) { | |
95 | if (!s->io[i].res) | |
96 | continue; | |
97 | ||
98 | if (!*base) | |
99 | continue; | |
100 | ||
101 | if ((s->io[i].res->start & (align-1)) == *base) | |
102 | return -EBUSY; | |
103 | } | |
104 | ||
105 | for (i = 0; i < MAX_IO_WIN; i++) { | |
106 | struct resource *res = s->io[i].res; | |
107 | unsigned int try; | |
108 | ||
109 | if (res && (res->flags & IORESOURCE_BITS) != | |
110 | (attr & IORESOURCE_BITS)) | |
111 | continue; | |
112 | ||
113 | if (!res) { | |
114 | if (align == 0) | |
115 | align = 0x10000; | |
116 | ||
117 | res = s->io[i].res = __iodyn_find_io_region(s, *base, | |
118 | num, align); | |
119 | if (!res) | |
120 | return -EINVAL; | |
121 | ||
122 | *base = res->start; | |
123 | s->io[i].res->flags = | |
124 | ((res->flags & ~IORESOURCE_BITS) | | |
125 | (attr & IORESOURCE_BITS)); | |
126 | s->io[i].InUse = num; | |
ad0c7be2 | 127 | *parent = res; |
b19a7275 DB |
128 | return 0; |
129 | } | |
130 | ||
131 | /* Try to extend top of window */ | |
132 | try = res->end + 1; | |
133 | if ((*base == 0) || (*base == try)) { | |
134 | if (adjust_resource(s->io[i].res, res->start, | |
28f65c11 | 135 | resource_size(res) + num)) |
b19a7275 DB |
136 | continue; |
137 | *base = try; | |
138 | s->io[i].InUse += num; | |
ad0c7be2 | 139 | *parent = res; |
b19a7275 DB |
140 | return 0; |
141 | } | |
142 | ||
143 | /* Try to extend bottom of window */ | |
144 | try = res->start - num; | |
145 | if ((*base == 0) || (*base == try)) { | |
146 | if (adjust_resource(s->io[i].res, | |
28f65c11 JP |
147 | res->start - num, |
148 | resource_size(res) + num)) | |
b19a7275 DB |
149 | continue; |
150 | *base = try; | |
151 | s->io[i].InUse += num; | |
ad0c7be2 | 152 | *parent = res; |
b19a7275 DB |
153 | return 0; |
154 | } | |
155 | } | |
156 | ||
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | ||
49b1153a DB |
161 | struct pccard_resource_ops pccard_iodyn_ops = { |
162 | .validate_mem = NULL, | |
b19a7275 | 163 | .find_io = iodyn_find_io, |
49b1153a | 164 | .find_mem = NULL, |
49b1153a DB |
165 | .init = static_init, |
166 | .exit = NULL, | |
167 | }; | |
168 | EXPORT_SYMBOL(pccard_iodyn_ops); |