1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
4 *
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
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15
16 #include <pcmcia/ss.h>
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
pcmcia_align(void * align_data,const struct resource * res,resource_size_t size,resource_size_t align)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
__iodyn_find_io_region(struct pcmcia_socket * s,unsigned long base,int num,unsigned long align)55 static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
56 unsigned long base, int num,
57 unsigned long align)
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
65 if (!res)
66 return NULL;
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
iodyn_find_io(struct pcmcia_socket * s,unsigned int attr,unsigned int * base,unsigned int num,unsigned int align,struct resource ** parent)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