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
21struct pcmcia_align_data {
22	unsigned long	mask;
23	unsigned long	offset;
24};
25
26static 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
55static 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	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
84static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
85			unsigned int *base, unsigned int num,
86			unsigned int align, struct resource **parent)
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;
127			*parent = res;
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,
135					    resource_size(res) + num))
136				continue;
137			*base = try;
138			s->io[i].InUse += num;
139			*parent = res;
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,
147					    res->start - num,
148					    resource_size(res) + num))
149				continue;
150			*base = try;
151			s->io[i].InUse += num;
152			*parent = res;
153			return 0;
154		}
155	}
156
157	return -EINVAL;
158}
159
160
161struct pccard_resource_ops pccard_iodyn_ops = {
162	.validate_mem = NULL,
163	.find_io = iodyn_find_io,
164	.find_mem = NULL,
165	.init = static_init,
166	.exit = NULL,
167};
168EXPORT_SYMBOL(pccard_iodyn_ops);
169