aboutsummaryrefslogtreecommitdiff
path: root/drivers/pcmcia/rsrc_iodyn.c
blob: b04b16496b0c4b76ebb381b5965f69dfc817f950 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
// SPDX-License-Identifier: GPL-2.0-only
/*
 * rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999		David A. Hinds
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>

#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>
#include "cs_internal.h"


struct pcmcia_align_data {
	unsigned long	mask;
	unsigned long	offset;
};

static resource_size_t pcmcia_align(void *align_data,
				const struct resource *res,
				resource_size_t size, resource_size_t align)
{
	struct pcmcia_align_data *data = align_data;
	resource_size_t start;

	start = (res->start & ~data->mask) + data->offset;
	if (start < res->start)
		start += data->mask + 1;

#ifdef CONFIG_X86
	if (res->flags & IORESOURCE_IO) {
		if (start & 0x300)
			start = (start + 0x3ff) & ~0x3ff;
	}
#endif

#ifdef CONFIG_M68K
	if (res->flags & IORESOURCE_IO) {
		if ((res->start + size - 1) >= 1024)
			start = res->end;
	}
#endif

	return start;
}


static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
					unsigned long base, int num,
					unsigned long align)
{
	struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
						dev_name(&s->dev));
	struct pcmcia_align_data data;
	unsigned long min = base;
	int ret;

	data.mask = align - 1;
	data.offset = base & data.mask;

#ifdef CONFIG_PCI
	if (s->cb_dev) {
		ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
					     min, 0, pcmcia_align, &data);
	} else
#endif
		ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
					1, pcmcia_align, &data);

	if (ret != 0) {
		kfree(res);
		res = NULL;
	}
	return res;
}

static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
			unsigned int *base, unsigned int num,
			unsigned int align, struct resource **parent)
{
	int i, ret = 0;

	/* Check for an already-allocated window that must conflict with
	 * what was asked for.  It is a hack because it does not catch all
	 * potential conflicts, just the most obvious ones.
	 */
	for (i = 0; i < MAX_IO_WIN; i++) {
		if (!s->io[i].res)
			continue;

		if (!*base)
			continue;

		if ((s->io[i].res->start & (align-1)) == *base)
			return -EBUSY;
	}

	for (i = 0; i < MAX_IO_WIN; i++) {
		struct resource *res = s->io[i].res;
		unsigned int try;

		if (res && (res->flags & IORESOURCE_BITS) !=
			(attr & IORESOURCE_BITS))
			continue;

		if (!res) {
			if (align == 0)
				align = 0x10000;

			res = s->io[i].res = __iodyn_find_io_region(s, *base,
								num, align);
			if (!res)
				return -EINVAL;

			*base = res->start;
			s->io[i].res->flags =
				((res->flags & ~IORESOURCE_BITS) |
					(attr & IORESOURCE_BITS));
			s->io[i].InUse = num;
			*parent = res;
			return 0;
		}

		/* Try to extend top of window */
		try = res->end + 1;
		if ((*base == 0) || (*base == try)) {
			if (adjust_resource(s->io[i].res, res->start,
					    resource_size(res) + num))
				continue;
			*base = try;
			s->io[i].InUse += num;
			*parent = res;
			return 0;
		}

		/* Try to extend bottom of window */
		try = res->start - num;
		if ((*base == 0) || (*base == try)) {
			if (adjust_resource(s->io[i].res,
					    res->start - num,
					    resource_size(res) + num))
				continue;
			*base = try;
			s->io[i].InUse += num;
			*parent = res;
			return 0;
		}
	}

	return -EINVAL;
}


struct pccard_resource_ops pccard_iodyn_ops = {
	.validate_mem = NULL,
	.find_io = iodyn_find_io,
	.find_mem = NULL,
	.init = static_init,
	.exit = NULL,
};
EXPORT_SYMBOL(pccard_iodyn_ops);