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 | |
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 | |
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(start: 0, end: num, IORESOURCE_IO, |
60 | name: dev_name(dev: &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(bus: s->cb_dev->bus, res, size: num, align: 1, |
71 | min, type_mask: 0, alignf: pcmcia_align, alignf_data: &data); |
72 | } else |
73 | #endif |
74 | ret = allocate_resource(root: &ioport_resource, new: res, size: num, min, max: ~0UL, |
75 | align: 1, alignf: pcmcia_align, alignf_data: &data); |
76 | |
77 | if (ret != 0) { |
78 | kfree(objp: res); |
79 | res = NULL; |
80 | } |
81 | return res; |
82 | } |
83 | |
84 | static 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: *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(res: s->io[i].res, start: res->start, |
135 | size: 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(res: s->io[i].res, |
147 | start: res->start - num, |
148 | size: 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 | |
161 | struct 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 | }; |
168 | EXPORT_SYMBOL(pccard_iodyn_ops); |
169 | |