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1 | /* | |
2 | * TURBOchannel bus services. | |
3 | * | |
4 | * Copyright (c) Harald Koerfgen, 1998 | |
5 | * Copyright (c) 2001, 2003, 2005, 2006 Maciej W. Rozycki | |
6 | * Copyright (c) 2005 James Simmons | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU | |
9 | * General Public License. See the file "COPYING" in the main | |
10 | * directory of this archive for more details. | |
11 | */ | |
12 | #include <linux/compiler.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/ioport.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/tc.h> | |
22 | #include <linux/types.h> | |
23 | ||
24 | #include <asm/io.h> | |
25 | ||
26 | static struct tc_bus tc_bus = { | |
27 | .name = "TURBOchannel", | |
28 | }; | |
29 | ||
30 | /* | |
31 | * Probing for TURBOchannel modules. | |
32 | */ | |
33 | static void __init tc_bus_add_devices(struct tc_bus *tbus) | |
34 | { | |
35 | resource_size_t slotsize = tbus->info.slot_size << 20; | |
36 | resource_size_t extslotsize = tbus->ext_slot_size; | |
37 | resource_size_t slotaddr; | |
38 | resource_size_t extslotaddr; | |
39 | resource_size_t devsize; | |
40 | void __iomem *module; | |
41 | struct tc_dev *tdev; | |
42 | int i, slot, err; | |
43 | u8 pattern[4]; | |
44 | long offset; | |
45 | ||
46 | for (slot = 0; slot < tbus->num_tcslots; slot++) { | |
47 | slotaddr = tbus->slot_base + slot * slotsize; | |
48 | extslotaddr = tbus->ext_slot_base + slot * extslotsize; | |
49 | module = ioremap_nocache(slotaddr, slotsize); | |
50 | BUG_ON(!module); | |
51 | ||
52 | offset = TC_OLDCARD; | |
53 | ||
54 | err = 0; | |
55 | err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0); | |
56 | err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1); | |
57 | err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2); | |
58 | err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3); | |
59 | if (err) | |
60 | goto out_err; | |
61 | ||
62 | if (pattern[0] != 0x55 || pattern[1] != 0x00 || | |
63 | pattern[2] != 0xaa || pattern[3] != 0xff) { | |
64 | offset = TC_NEWCARD; | |
65 | ||
66 | err = 0; | |
67 | err |= tc_preadb(pattern + 0, | |
68 | module + offset + TC_PATTERN0); | |
69 | err |= tc_preadb(pattern + 1, | |
70 | module + offset + TC_PATTERN1); | |
71 | err |= tc_preadb(pattern + 2, | |
72 | module + offset + TC_PATTERN2); | |
73 | err |= tc_preadb(pattern + 3, | |
74 | module + offset + TC_PATTERN3); | |
75 | if (err) | |
76 | goto out_err; | |
77 | } | |
78 | ||
79 | if (pattern[0] != 0x55 || pattern[1] != 0x00 || | |
80 | pattern[2] != 0xaa || pattern[3] != 0xff) | |
81 | goto out_err; | |
82 | ||
83 | /* Found a board, allocate it an entry in the list */ | |
84 | tdev = kzalloc(sizeof(*tdev), GFP_KERNEL); | |
85 | if (!tdev) { | |
86 | pr_err("tc%x: unable to allocate tc_dev\n", slot); | |
87 | goto out_err; | |
88 | } | |
89 | dev_set_name(&tdev->dev, "tc%x", slot); | |
90 | tdev->bus = tbus; | |
91 | tdev->dev.parent = &tbus->dev; | |
92 | tdev->dev.bus = &tc_bus_type; | |
93 | tdev->slot = slot; | |
94 | ||
95 | for (i = 0; i < 8; i++) { | |
96 | tdev->firmware[i] = | |
97 | readb(module + offset + TC_FIRM_VER + 4 * i); | |
98 | tdev->vendor[i] = | |
99 | readb(module + offset + TC_VENDOR + 4 * i); | |
100 | tdev->name[i] = | |
101 | readb(module + offset + TC_MODULE + 4 * i); | |
102 | } | |
103 | tdev->firmware[8] = 0; | |
104 | tdev->vendor[8] = 0; | |
105 | tdev->name[8] = 0; | |
106 | ||
107 | pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor, | |
108 | tdev->name, tdev->firmware); | |
109 | ||
110 | devsize = readb(module + offset + TC_SLOT_SIZE); | |
111 | devsize <<= 22; | |
112 | if (devsize <= slotsize) { | |
113 | tdev->resource.start = slotaddr; | |
114 | tdev->resource.end = slotaddr + devsize - 1; | |
115 | } else if (devsize <= extslotsize) { | |
116 | tdev->resource.start = extslotaddr; | |
117 | tdev->resource.end = extslotaddr + devsize - 1; | |
118 | } else { | |
119 | pr_err("%s: Cannot provide slot space " | |
120 | "(%ldMiB required, up to %ldMiB supported)\n", | |
121 | dev_name(&tdev->dev), (long)(devsize >> 20), | |
122 | (long)(max(slotsize, extslotsize) >> 20)); | |
123 | kfree(tdev); | |
124 | goto out_err; | |
125 | } | |
126 | tdev->resource.name = tdev->name; | |
127 | tdev->resource.flags = IORESOURCE_MEM; | |
128 | ||
129 | tc_device_get_irq(tdev); | |
130 | ||
131 | if (device_register(&tdev->dev)) { | |
132 | put_device(&tdev->dev); | |
133 | goto out_err; | |
134 | } | |
135 | list_add_tail(&tdev->node, &tbus->devices); | |
136 | ||
137 | out_err: | |
138 | iounmap(module); | |
139 | } | |
140 | } | |
141 | ||
142 | /* | |
143 | * The main entry. | |
144 | */ | |
145 | static int __init tc_init(void) | |
146 | { | |
147 | /* Initialize the TURBOchannel bus */ | |
148 | if (tc_bus_get_info(&tc_bus)) | |
149 | goto out_err; | |
150 | ||
151 | INIT_LIST_HEAD(&tc_bus.devices); | |
152 | dev_set_name(&tc_bus.dev, "tc"); | |
153 | if (device_register(&tc_bus.dev)) | |
154 | goto out_err_device; | |
155 | ||
156 | if (tc_bus.info.slot_size) { | |
157 | unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000; | |
158 | ||
159 | pr_info("tc: TURBOchannel rev. %d at %d.%d MHz " | |
160 | "(with%s parity)\n", tc_bus.info.revision, | |
161 | tc_clock / 10, tc_clock % 10, | |
162 | tc_bus.info.parity ? "" : "out"); | |
163 | ||
164 | tc_bus.resource[0].start = tc_bus.slot_base; | |
165 | tc_bus.resource[0].end = tc_bus.slot_base + | |
166 | (tc_bus.info.slot_size << 20) * | |
167 | tc_bus.num_tcslots - 1; | |
168 | tc_bus.resource[0].name = tc_bus.name; | |
169 | tc_bus.resource[0].flags = IORESOURCE_MEM; | |
170 | if (request_resource(&iomem_resource, | |
171 | &tc_bus.resource[0]) < 0) { | |
172 | pr_err("tc: Cannot reserve resource\n"); | |
173 | goto out_err_device; | |
174 | } | |
175 | if (tc_bus.ext_slot_size) { | |
176 | tc_bus.resource[1].start = tc_bus.ext_slot_base; | |
177 | tc_bus.resource[1].end = tc_bus.ext_slot_base + | |
178 | tc_bus.ext_slot_size * | |
179 | tc_bus.num_tcslots - 1; | |
180 | tc_bus.resource[1].name = tc_bus.name; | |
181 | tc_bus.resource[1].flags = IORESOURCE_MEM; | |
182 | if (request_resource(&iomem_resource, | |
183 | &tc_bus.resource[1]) < 0) { | |
184 | pr_err("tc: Cannot reserve resource\n"); | |
185 | goto out_err_resource; | |
186 | } | |
187 | } | |
188 | ||
189 | tc_bus_add_devices(&tc_bus); | |
190 | } | |
191 | ||
192 | return 0; | |
193 | ||
194 | out_err_resource: | |
195 | release_resource(&tc_bus.resource[0]); | |
196 | out_err_device: | |
197 | put_device(&tc_bus.dev); | |
198 | out_err: | |
199 | return 0; | |
200 | } | |
201 | ||
202 | subsys_initcall(tc_init); |