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
24struct pcmcia_align_data {
25	unsigned long	mask;
26	unsigned long	offset;
27};
28
29static 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
58static 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
87static 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
164struct 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};
171EXPORT_SYMBOL(pccard_iodyn_ops);
172