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1/*
2 * TURBOchannel bus services.
3 *
4 * Copyright (c) Harald Koerfgen, 1998
5 * Copyright (c) 2001, 2003, 2005, 2006, 2018 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/dma-mapping.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/ioport.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22#include <linux/tc.h>
23#include <linux/types.h>
24
25#include <asm/io.h>
26
27static struct tc_bus tc_bus = {
28 .name = "TURBOchannel",
29};
30
31/*
32 * Probing for TURBOchannel modules.
33 */
34static void __init tc_bus_add_devices(struct tc_bus *tbus)
35{
36 resource_size_t slotsize = tbus->info.slot_size << 20;
37 resource_size_t extslotsize = tbus->ext_slot_size;
38 resource_size_t slotaddr;
39 resource_size_t extslotaddr;
40 resource_size_t devsize;
41 void __iomem *module;
42 struct tc_dev *tdev;
43 int i, slot, err;
44 u8 pattern[4];
45 long offset;
46
47 for (slot = 0; slot < tbus->num_tcslots; slot++) {
48 slotaddr = tbus->slot_base + slot * slotsize;
49 extslotaddr = tbus->ext_slot_base + slot * extslotsize;
50 module = ioremap(slotaddr, slotsize);
51 BUG_ON(!module);
52
53 offset = TC_OLDCARD;
54
55 err = 0;
56 err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
57 err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
58 err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
59 err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
60 if (err)
61 goto out_err;
62
63 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
64 pattern[2] != 0xaa || pattern[3] != 0xff) {
65 offset = TC_NEWCARD;
66
67 err = 0;
68 err |= tc_preadb(pattern + 0,
69 module + offset + TC_PATTERN0);
70 err |= tc_preadb(pattern + 1,
71 module + offset + TC_PATTERN1);
72 err |= tc_preadb(pattern + 2,
73 module + offset + TC_PATTERN2);
74 err |= tc_preadb(pattern + 3,
75 module + offset + TC_PATTERN3);
76 if (err)
77 goto out_err;
78 }
79
80 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
81 pattern[2] != 0xaa || pattern[3] != 0xff)
82 goto out_err;
83
84 /* Found a board, allocate it an entry in the list */
85 tdev = kzalloc_obj(*tdev);
86 if (!tdev) {
87 pr_err("tc%x: unable to allocate tc_dev\n", slot);
88 goto out_err;
89 }
90 dev_set_name(&tdev->dev, "tc%x", slot);
91 tdev->bus = tbus;
92 tdev->dev.parent = &tbus->dev;
93 tdev->dev.bus = &tc_bus_type;
94 tdev->slot = slot;
95
96 /* TURBOchannel has 34-bit DMA addressing (16GiB space). */
97 tdev->dma_mask = DMA_BIT_MASK(34);
98 tdev->dev.dma_mask = &tdev->dma_mask;
99 tdev->dev.coherent_dma_mask = DMA_BIT_MASK(34);
100
101 for (i = 0; i < 8; i++) {
102 tdev->firmware[i] =
103 readb(module + offset + TC_FIRM_VER + 4 * i);
104 tdev->vendor[i] =
105 readb(module + offset + TC_VENDOR + 4 * i);
106 tdev->name[i] =
107 readb(module + offset + TC_MODULE + 4 * i);
108 }
109 tdev->firmware[8] = 0;
110 tdev->vendor[8] = 0;
111 tdev->name[8] = 0;
112
113 pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor,
114 tdev->name, tdev->firmware);
115
116 devsize = readb(module + offset + TC_SLOT_SIZE);
117 devsize <<= 22;
118 if (devsize <= slotsize) {
119 tdev->resource.start = slotaddr;
120 tdev->resource.end = slotaddr + devsize - 1;
121 } else if (devsize <= extslotsize) {
122 tdev->resource.start = extslotaddr;
123 tdev->resource.end = extslotaddr + devsize - 1;
124 } else {
125 pr_err("%s: Cannot provide slot space "
126 "(%ldMiB required, up to %ldMiB supported)\n",
127 dev_name(&tdev->dev), (long)(devsize >> 20),
128 (long)(max(slotsize, extslotsize) >> 20));
129 kfree(tdev);
130 goto out_err;
131 }
132 tdev->resource.name = tdev->name;
133 tdev->resource.flags = IORESOURCE_MEM;
134
135 tc_device_get_irq(tdev);
136
137 if (device_register(&tdev->dev)) {
138 put_device(&tdev->dev);
139 goto out_err;
140 }
141 list_add_tail(&tdev->node, &tbus->devices);
142
143out_err:
144 iounmap(module);
145 }
146}
147
148/*
149 * The main entry.
150 */
151static int __init tc_init(void)
152{
153 /* Initialize the TURBOchannel bus */
154 if (tc_bus_get_info(&tc_bus))
155 goto out_err;
156
157 INIT_LIST_HEAD(&tc_bus.devices);
158 dev_set_name(&tc_bus.dev, "tc");
159 if (device_register(&tc_bus.dev))
160 goto out_err_device;
161
162 if (tc_bus.info.slot_size) {
163 unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;
164
165 pr_info("tc: TURBOchannel rev. %d at %u.%u MHz "
166 "(with%s parity)\n", tc_bus.info.revision,
167 tc_clock / 10, tc_clock % 10,
168 tc_bus.info.parity ? "" : "out");
169
170 tc_bus.resource[0].start = tc_bus.slot_base;
171 tc_bus.resource[0].end = tc_bus.slot_base +
172 (tc_bus.info.slot_size << 20) *
173 tc_bus.num_tcslots - 1;
174 tc_bus.resource[0].name = tc_bus.name;
175 tc_bus.resource[0].flags = IORESOURCE_MEM;
176 if (request_resource(&iomem_resource,
177 &tc_bus.resource[0]) < 0) {
178 pr_err("tc: Cannot reserve resource\n");
179 goto out_err_device;
180 }
181 if (tc_bus.ext_slot_size) {
182 tc_bus.resource[1].start = tc_bus.ext_slot_base;
183 tc_bus.resource[1].end = tc_bus.ext_slot_base +
184 tc_bus.ext_slot_size *
185 tc_bus.num_tcslots - 1;
186 tc_bus.resource[1].name = tc_bus.name;
187 tc_bus.resource[1].flags = IORESOURCE_MEM;
188 if (request_resource(&iomem_resource,
189 &tc_bus.resource[1]) < 0) {
190 pr_err("tc: Cannot reserve resource\n");
191 goto out_err_resource;
192 }
193 }
194
195 tc_bus_add_devices(&tc_bus);
196 }
197
198 return 0;
199
200out_err_resource:
201 release_resource(&tc_bus.resource[0]);
202out_err_device:
203 put_device(&tc_bus.dev);
204out_err:
205 return 0;
206}
207
208subsys_initcall(tc_init);