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02b03846 AC |
1 | #include <linux/slab.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/kernel.h> | |
d885d4f3 | 4 | #include <linux/pci.h> |
02b03846 AC |
5 | |
6 | #include <pcmcia/ss.h> | |
7 | #include <pcmcia/cistpl.h> | |
8 | #include "cs_internal.h" | |
9 | ||
10 | ||
11 | struct pcmcia_align_data { | |
12 | unsigned long mask; | |
13 | unsigned long offset; | |
14 | }; | |
15 | ||
16 | static resource_size_t pcmcia_align(void *align_data, | |
17 | const struct resource *res, | |
18 | resource_size_t size, resource_size_t align) | |
19 | { | |
20 | struct pcmcia_align_data *data = align_data; | |
21 | resource_size_t start; | |
22 | ||
23 | start = (res->start & ~data->mask) + data->offset; | |
24 | if (start < res->start) | |
25 | start += data->mask + 1; | |
26 | return start; | |
27 | } | |
28 | ||
29 | static struct resource *find_io_region(struct pcmcia_socket *s, | |
30 | unsigned long base, int num, | |
31 | unsigned long align) | |
32 | { | |
33 | struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO, | |
34 | dev_name(&s->dev)); | |
35 | struct pcmcia_align_data data; | |
36 | int ret; | |
37 | ||
38 | data.mask = align - 1; | |
39 | data.offset = base & data.mask; | |
40 | ||
41 | ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1, | |
42 | base, 0, pcmcia_align, &data); | |
43 | if (ret != 0) { | |
44 | kfree(res); | |
45 | res = NULL; | |
46 | } | |
47 | return res; | |
48 | } | |
49 | ||
50 | static int res_pci_find_io(struct pcmcia_socket *s, unsigned int attr, | |
51 | unsigned int *base, unsigned int num, | |
52 | unsigned int align, struct resource **parent) | |
53 | { | |
54 | int i, ret = 0; | |
55 | ||
56 | /* Check for an already-allocated window that must conflict with | |
57 | * what was asked for. It is a hack because it does not catch all | |
58 | * potential conflicts, just the most obvious ones. | |
59 | */ | |
60 | for (i = 0; i < MAX_IO_WIN; i++) { | |
61 | if (!s->io[i].res) | |
62 | continue; | |
63 | ||
64 | if (!*base) | |
65 | continue; | |
66 | ||
67 | if ((s->io[i].res->start & (align-1)) == *base) | |
68 | return -EBUSY; | |
69 | } | |
70 | ||
71 | for (i = 0; i < MAX_IO_WIN; i++) { | |
72 | struct resource *res = s->io[i].res; | |
73 | unsigned int try; | |
74 | ||
75 | if (res && (res->flags & IORESOURCE_BITS) != | |
76 | (attr & IORESOURCE_BITS)) | |
77 | continue; | |
78 | ||
79 | if (!res) { | |
80 | if (align == 0) | |
81 | align = 0x10000; | |
82 | ||
83 | res = s->io[i].res = find_io_region(s, *base, num, | |
84 | align); | |
85 | if (!res) | |
86 | return -EINVAL; | |
87 | ||
88 | *base = res->start; | |
89 | s->io[i].res->flags = | |
90 | ((res->flags & ~IORESOURCE_BITS) | | |
91 | (attr & IORESOURCE_BITS)); | |
92 | s->io[i].InUse = num; | |
93 | *parent = res; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Try to extend top of window */ | |
98 | try = res->end + 1; | |
99 | if ((*base == 0) || (*base == try)) { | |
100 | ret = adjust_resource(s->io[i].res, res->start, | |
101 | resource_size(res) + num); | |
102 | if (ret) | |
103 | continue; | |
104 | *base = try; | |
105 | s->io[i].InUse += num; | |
106 | *parent = res; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* Try to extend bottom of window */ | |
111 | try = res->start - num; | |
112 | if ((*base == 0) || (*base == try)) { | |
113 | ret = adjust_resource(s->io[i].res, | |
114 | res->start - num, | |
115 | resource_size(res) + num); | |
116 | if (ret) | |
117 | continue; | |
118 | *base = try; | |
119 | s->io[i].InUse += num; | |
120 | *parent = res; | |
121 | return 0; | |
122 | } | |
123 | } | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | static struct resource *res_pci_find_mem(u_long base, u_long num, | |
128 | u_long align, int low, struct pcmcia_socket *s) | |
129 | { | |
130 | struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_MEM, | |
131 | dev_name(&s->dev)); | |
132 | struct pcmcia_align_data data; | |
133 | unsigned long min; | |
134 | int ret; | |
135 | ||
136 | if (align < 0x20000) | |
137 | align = 0x20000; | |
138 | data.mask = align - 1; | |
139 | data.offset = base & data.mask; | |
140 | ||
141 | min = 0; | |
142 | if (!low) | |
143 | min = 0x100000UL; | |
144 | ||
145 | ret = pci_bus_alloc_resource(s->cb_dev->bus, | |
146 | res, num, 1, min, 0, | |
147 | pcmcia_align, &data); | |
148 | ||
149 | if (ret != 0) { | |
150 | kfree(res); | |
151 | res = NULL; | |
152 | } | |
153 | return res; | |
154 | } | |
155 | ||
156 | ||
157 | static int res_pci_init(struct pcmcia_socket *s) | |
158 | { | |
159 | if (!s->cb_dev || (!s->features & SS_CAP_PAGE_REGS)) { | |
160 | dev_err(&s->dev, "not supported by res_pci\n"); | |
161 | return -EOPNOTSUPP; | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | struct pccard_resource_ops pccard_nonstatic_ops = { | |
167 | .validate_mem = NULL, | |
168 | .find_io = res_pci_find_io, | |
169 | .find_mem = res_pci_find_mem, | |
170 | .init = res_pci_init, | |
171 | .exit = NULL, | |
172 | }; | |
173 | EXPORT_SYMBOL(pccard_nonstatic_ops); |