summaryrefslogtreecommitdiff
path: root/drivers/tc/tc.c
blob: 5514e5283616f04c9980ce1705eb769052d86354 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
 *	TURBOchannel bus services.
 *
 *	Copyright (c) Harald Koerfgen, 1998
 *	Copyright (c) 2001, 2003, 2005, 2006  Maciej W. Rozycki
 *	Copyright (c) 2005  James Simmons
 *
 *	This file is subject to the terms and conditions of the GNU
 *	General Public License.  See the file "COPYING" in the main
 *	directory of this archive for more details.
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>

#include <asm/io.h>

static struct tc_bus tc_bus = {
	.name = "TURBOchannel",
};

/*
 * Probing for TURBOchannel modules.
 */
static void __init tc_bus_add_devices(struct tc_bus *tbus)
{
	resource_size_t slotsize = tbus->info.slot_size << 20;
	resource_size_t extslotsize = tbus->ext_slot_size;
	resource_size_t slotaddr;
	resource_size_t extslotaddr;
	resource_size_t devsize;
	void __iomem *module;
	struct tc_dev *tdev;
	int i, slot, err;
	u8 pattern[4];
	long offset;

	for (slot = 0; slot < tbus->num_tcslots; slot++) {
		slotaddr = tbus->slot_base + slot * slotsize;
		extslotaddr = tbus->ext_slot_base + slot * extslotsize;
		module = ioremap_nocache(slotaddr, slotsize);
		BUG_ON(!module);

		offset = TC_OLDCARD;

		err = 0;
		err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
		err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
		err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
		err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
		if (err)
			goto out_err;

		if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
		    pattern[2] != 0xaa || pattern[3] != 0xff) {
			offset = TC_NEWCARD;

			err = 0;
			err |= tc_preadb(pattern + 0,
					 module + offset + TC_PATTERN0);
			err |= tc_preadb(pattern + 1,
					 module + offset + TC_PATTERN1);
			err |= tc_preadb(pattern + 2,
					 module + offset + TC_PATTERN2);
			err |= tc_preadb(pattern + 3,
					 module + offset + TC_PATTERN3);
			if (err)
				goto out_err;
		}

		if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
		    pattern[2] != 0xaa || pattern[3] != 0xff)
			goto out_err;

		/* Found a board, allocate it an entry in the list */
		tdev = kzalloc(sizeof(*tdev), GFP_KERNEL);
		if (!tdev) {
			printk(KERN_ERR "tc%x: unable to allocate tc_dev\n",
			       slot);
			goto out_err;
		}
		sprintf(tdev->dev.bus_id, "tc%x", slot);
		tdev->bus = tbus;
		tdev->dev.parent = &tbus->dev;
		tdev->dev.bus = &tc_bus_type;
		tdev->slot = slot;

		for (i = 0; i < 8; i++) {
			tdev->firmware[i] =
				readb(module + offset + TC_FIRM_VER + 4 * i);
			tdev->vendor[i] =
				readb(module + offset + TC_VENDOR + 4 * i);
			tdev->name[i] =
				readb(module + offset + TC_MODULE + 4 * i);
		}
		tdev->firmware[8] = 0;
		tdev->vendor[8] = 0;
		tdev->name[8] = 0;

		pr_info("%s: %s %s %s\n", tdev->dev.bus_id, tdev->vendor,
			tdev->name, tdev->firmware);

		devsize = readb(module + offset + TC_SLOT_SIZE);
		devsize <<= 22;
		if (devsize <= slotsize) {
			tdev->resource.start = slotaddr;
			tdev->resource.end = slotaddr + devsize - 1;
		} else if (devsize <= extslotsize) {
			tdev->resource.start = extslotaddr;
			tdev->resource.end = extslotaddr + devsize - 1;
		} else {
			printk(KERN_ERR "%s: Cannot provide slot space "
			       "(%dMiB required, up to %dMiB supported)\n",
			       tdev->dev.bus_id, devsize >> 20,
			       max(slotsize, extslotsize) >> 20);
			kfree(tdev);
			goto out_err;
		}
		tdev->resource.name = tdev->name;
		tdev->resource.flags = IORESOURCE_MEM;

		tc_device_get_irq(tdev);

		device_register(&tdev->dev);
		list_add_tail(&tdev->node, &tbus->devices);

out_err:
		iounmap(module);
	}
}

/*
 * The main entry.
 */
static int __init tc_init(void)
{
	/* Initialize the TURBOchannel bus */
	if (tc_bus_get_info(&tc_bus))
		return 0;

	INIT_LIST_HEAD(&tc_bus.devices);
	strcpy(tc_bus.dev.bus_id, "tc");
	device_register(&tc_bus.dev);

	if (tc_bus.info.slot_size) {
		unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;

		pr_info("tc: TURBOchannel rev. %d at %d.%d MHz "
			"(with%s parity)\n", tc_bus.info.revision,
			tc_clock / 10, tc_clock % 10,
			tc_bus.info.parity ? "" : "out");

		tc_bus.resource[0].start = tc_bus.slot_base;
		tc_bus.resource[0].end = tc_bus.slot_base +
					 (tc_bus.info.slot_size << 20) *
					 tc_bus.num_tcslots;
		tc_bus.resource[0].name = tc_bus.name;
		tc_bus.resource[0].flags = IORESOURCE_MEM;
		if (request_resource(&iomem_resource,
				     &tc_bus.resource[0]) < 0) {
			printk(KERN_ERR "tc: Cannot reserve resource\n");
			return 0;
		}
		if (tc_bus.ext_slot_size) {
			tc_bus.resource[1].start = tc_bus.ext_slot_base;
			tc_bus.resource[1].end = tc_bus.ext_slot_base +
						 tc_bus.ext_slot_size *
						 tc_bus.num_tcslots;
			tc_bus.resource[1].name = tc_bus.name;
			tc_bus.resource[1].flags = IORESOURCE_MEM;
			if (request_resource(&iomem_resource,
					     &tc_bus.resource[1]) < 0) {
				printk(KERN_ERR
				       "tc: Cannot reserve resource\n");
				release_resource(&tc_bus.resource[0]);
				return 0;
			}
		}

		tc_bus_add_devices(&tc_bus);
	}

	return 0;
}

subsys_initcall(tc_init);