aboutsummaryrefslogtreecommitdiff
path: root/drivers/tc/tc.c
blob: d742c3a90b23c42750eff227e0924c01e56b8394 (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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/*
 * tc-init: We assume the TURBOchannel to be up and running so
 * just probe for Modules and fill in the global data structure
 * tc_bus.
 *
 * 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.
 *
 * Copyright (c) Harald Koerfgen, 1998
 * Copyright (c) 2001, 2003, 2005  Maciej W. Rozycki
 */
#include <linux/string.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <asm/addrspace.h>
#include <asm/errno.h>
#include <asm/dec/machtype.h>
#include <asm/dec/prom.h>
#include <asm/dec/tcinfo.h>
#include <asm/dec/tcmodule.h>
#include <asm/dec/interrupts.h>
#include <asm/paccess.h>
#include <asm/ptrace.h>

#define TC_DEBUG

MODULE_LICENSE("GPL");
slot_info tc_bus[MAX_SLOT];
static int num_tcslots;
static tcinfo *info;

unsigned long system_base;

/*
 * Interface to the world. Read comment in include/asm-mips/tc.h.
 */

int search_tc_card(const char *name)
{
	int slot;
	slot_info *sip;

	for (slot = 0; slot < num_tcslots; slot++) {
		sip = &tc_bus[slot];
		if ((sip->flags & FREE) &&
		    (strncmp(sip->name, name, strlen(name)) == 0)) {
			return slot;
		}
	}

	return -ENODEV;
}

void claim_tc_card(int slot)
{
	if (tc_bus[slot].flags & IN_USE) {
		printk("claim_tc_card: attempting to claim a card already in use\n");
		return;
	}
	tc_bus[slot].flags &= ~FREE;
	tc_bus[slot].flags |= IN_USE;
}

void release_tc_card(int slot)
{
	if (tc_bus[slot].flags & FREE) {
		printk("release_tc_card: "
		       "attempting to release a card already free\n");
		return;
	}
	tc_bus[slot].flags &= ~IN_USE;
	tc_bus[slot].flags |= FREE;
}

unsigned long get_tc_base_addr(int slot)
{
	return tc_bus[slot].base_addr;
}

unsigned long get_tc_irq_nr(int slot)
{
	return tc_bus[slot].interrupt;
}

unsigned long get_tc_speed(void)
{
	return 100000 * (10000 / (unsigned long)info->clk_period);
}

/*
 * Probing for TURBOchannel modules
 */
static void __init tc_probe(unsigned long startaddr, unsigned long size,
			    int slots)
{
	int i, slot, err;
	long offset;
	unsigned char pattern[4];
	unsigned char *module;

	for (slot = 0; slot < slots; slot++) {
		module = (char *)(startaddr + slot * size);

		offset = OLDCARD;

		err = 0;
		err |= get_dbe(pattern[0], module + OLDCARD + TC_PATTERN0);
		err |= get_dbe(pattern[1], module + OLDCARD + TC_PATTERN1);
		err |= get_dbe(pattern[2], module + OLDCARD + TC_PATTERN2);
		err |= get_dbe(pattern[3], module + OLDCARD + TC_PATTERN3);
		if (err)
			continue;

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

			err = 0;
			err |= get_dbe(pattern[0], module + TC_PATTERN0);
			err |= get_dbe(pattern[1], module + TC_PATTERN1);
			err |= get_dbe(pattern[2], module + TC_PATTERN2);
			err |= get_dbe(pattern[3], module + TC_PATTERN3);
			if (err)
				continue;
		}

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

		tc_bus[slot].base_addr = (unsigned long)module;
		for(i = 0; i < 8; i++) {
			tc_bus[slot].firmware[i] =
				module[TC_FIRM_VER + offset + 4 * i];
			tc_bus[slot].vendor[i] =
				module[TC_VENDOR + offset + 4 * i];
			tc_bus[slot].name[i] =
				module[TC_MODULE + offset + 4 * i];
		}
		tc_bus[slot].firmware[8] = 0;
		tc_bus[slot].vendor[8] = 0;
		tc_bus[slot].name[8] = 0;
		/*
		 * Looks unneccesary, but we may change
		 * TC? in the future
		 */
		switch (slot) {
		case 0:
			tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC0];
			break;
		case 1:
			tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC1];
			break;
		case 2:
			tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC2];
			break;
		/*
		 * Yuck! DS5000/200 onboard devices
		 */
		case 5:
			tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC5];
			break;
		case 6:
			tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC6];
			break;
		default:
			tc_bus[slot].interrupt = -1;
			break;
		}
	}
}

/*
 * the main entry
 */
static int __init tc_init(void)
{
	int tc_clock;
	int i;
	unsigned long slot0addr;
	unsigned long slot_size;

	if (!TURBOCHANNEL)
		return 0;

	for (i = 0; i < MAX_SLOT; i++) {
		tc_bus[i].base_addr = 0;
		tc_bus[i].name[0] = 0;
		tc_bus[i].vendor[0] = 0;
		tc_bus[i].firmware[0] = 0;
		tc_bus[i].interrupt = -1;
		tc_bus[i].flags = FREE;
	}

	info = (tcinfo *) rex_gettcinfo();
	slot0addr = (unsigned long)CKSEG1ADDR(rex_slot_address(0));

	switch (mips_machtype) {
	case MACH_DS5000_200:
		num_tcslots = 7;
		break;
	case MACH_DS5000_1XX:
	case MACH_DS5000_2X0:
	case MACH_DS5900:
		num_tcslots = 3;
		break;
	case MACH_DS5000_XX:
	default:
		num_tcslots = 2;
		break;
	}

	tc_clock = 10000 / info->clk_period;

	if (TURBOCHANNEL && info->slot_size && slot0addr) {
		printk("TURBOchannel rev. %1d at %2d.%1d MHz ", info->revision,
			tc_clock / 10, tc_clock % 10);
		printk("(with%s parity)\n", info->parity ? "" : "out");

		slot_size = info->slot_size << 20;

		tc_probe(slot0addr, slot_size, num_tcslots);

  		/*
  		 * All TURBOchannel DECstations have the onboard devices
 		 * where the (num_tcslots + 0 or 1 on DS5k/xx) Option Module
 		 * would be.
 		 */
 		if(mips_machtype == MACH_DS5000_XX)
 			i = 1;
		else
 			i = 0;

 	        system_base = slot0addr + slot_size * (num_tcslots + i);

#ifdef TC_DEBUG
		for (i = 0; i < num_tcslots; i++)
			if (tc_bus[i].base_addr) {
				printk("    slot %d: ", i);
				printk("%s %s %s\n", tc_bus[i].vendor,
					tc_bus[i].name, tc_bus[i].firmware);
			}
#endif
	}

	return 0;
}

subsys_initcall(tc_init);

EXPORT_SYMBOL(search_tc_card);
EXPORT_SYMBOL(claim_tc_card);
EXPORT_SYMBOL(release_tc_card);
EXPORT_SYMBOL(get_tc_base_addr);
EXPORT_SYMBOL(get_tc_irq_nr);
EXPORT_SYMBOL(get_tc_speed);
EXPORT_SYMBOL(system_base);