summaryrefslogtreecommitdiffstats
path: root/sys/boot/common/isapnp.c
blob: a8efb28c7e1b31153b3bf8978fc7a73ae25bf99c (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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/*-
 * Copyright (c) 1998, Michael Smith
 * Copyright (c) 1996, Sujal M. Patel
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * Machine-independant ISA PnP enumerator implementing a subset of the
 * ISA PnP specification.
 */
#include <stand.h>
#include <string.h>
#include <bootstrap.h>
#include <isapnp.h>

#define inb(x)		(archsw.arch_isainb((x)))
#define outb(x,y)	(archsw.arch_isaoutb((x),(y)))

static void	isapnp_write(int d, int r);
static void	isapnp_send_Initiation_LFSR(void);
static int	isapnp_get_serial(u_int8_t *p);
static int	isapnp_isolation_protocol(void);
static void	isapnp_enumerate(void);

/* PnP read data port */
int		isapnp_readport = 0;

#define _PNP_ID_LEN	9

struct pnphandler isapnphandler =
{
    "ISA bus",
    isapnp_enumerate
};

static void
isapnp_write(int d, int r)
{
    outb (_PNP_ADDRESS, d);
    outb (_PNP_WRITE_DATA, r);
}

/*
 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
 * Intel May 94.
 */
static void
isapnp_send_Initiation_LFSR(void)
{
    int cur, i;

    /* Reset the LSFR */
    outb(_PNP_ADDRESS, 0);
    outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */

    cur = 0x6a;
    outb(_PNP_ADDRESS, cur);

    for (i = 1; i < 32; i++) {
	cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
	outb(_PNP_ADDRESS, cur);
    }
}

/*
 * Get the device's serial number.  Returns 1 if the serial is valid.
 */
static int
isapnp_get_serial(u_int8_t *data)
{
    int		i, bit, valid = 0, sum = 0x6a;

    bzero(data, _PNP_ID_LEN);
    outb(_PNP_ADDRESS, SERIAL_ISOLATION);
    for (i = 0; i < 72; i++) {
	bit = inb(isapnp_readport) == 0x55;
	delay(250);	/* Delay 250 usec */

	/* Can't Short Circuit the next evaluation, so 'and' is last */
	bit = (inb(isapnp_readport) == 0xaa) && bit;
	delay(250);	/* Delay 250 usec */

	valid = valid || bit;

	if (i < 64)
	    sum = (sum >> 1) |
		(((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);

	data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
    }

    valid = valid && (data[8] == sum);

    return valid;
}

/*
 * Fills the buffer with resource info from the device.
 * Returns nonzero if the device fails to report
 */
static int
isapnp_get_resource_info(u_int8_t *buffer, int len)
{
    int		i, j;
    u_char	temp;

    for (i = 0; i < len; i++) {
        outb(_PNP_ADDRESS, STATUS);
        for (j = 0; j < 100; j++) {
            if ((inb(isapnp_readport)) & 0x1)
                break;
            delay(1);
        }
        if (j == 100) {
            printf("PnP device failed to report resource data\n");
            return(1);
        }
        outb(_PNP_ADDRESS, RESOURCE_DATA);
        temp = inb(isapnp_readport);
        if (buffer != NULL)
            buffer[i] = temp;
    }
    return(0);
}

/*
 * Scan Resource Data for useful information.
 *
 * We scan the resource data for compatible device IDs and
 * identifier strings; we only take the first identifier string
 * and assume it's for the card as a whole.
 *
 * Returns 0 if the scan completed OK, nonzero on error.
 */
static int
isapnp_scan_resdata(struct pnpinfo *pi)
{
    u_char	tag, resinfo[8];
    u_int	limit;
    size_t	large_len;
    u_char	*str;

    limit = 1000;
    while ((limit-- > 0) && !isapnp_get_resource_info(&tag, 1)) {
        if (PNP_RES_TYPE(tag) == 0) {
            /* Small resource */
            switch (PNP_SRES_NUM(tag)) {

                case COMP_DEVICE_ID:
                    /* Got a compatible device id resource */
                    if (isapnp_get_resource_info(resinfo, PNP_SRES_LEN(tag)))
			return(1);
		    pnp_addident(pi, pnp_eisaformat(resinfo));

                case END_TAG:
		    return(0);
                    break;

                default:
                    /* Skip this resource */
                    if (isapnp_get_resource_info(NULL, PNP_SRES_LEN(tag)))
			return(1);
                    break;
            }
        } else {
	    /* Large resource */
	    if (isapnp_get_resource_info(resinfo, 2))
		return(1);

	    large_len = resinfo[1];
	    large_len = (large_len << 8) + resinfo[0];

	    switch(PNP_LRES_NUM(tag)) {

	    case ID_STRING_ANSI:
		str = malloc(large_len + 1);
		if (isapnp_get_resource_info(str, (ssize_t)large_len)) {
		    free(str);
		    return(1);
		}
		str[large_len] = 0;
		if (pi->pi_desc == NULL) {
		    pi->pi_desc = (char *)str;
		} else {
		    free(str);
		}
		break;
		
	    default:
		/* Large resource, skip it */
		if (isapnp_get_resource_info(NULL, (ssize_t)large_len))
		    return(1);
	    }
	}
    }
    return(1);
}

/*
 * Run the isolation protocol. Upon exiting, all cards are aware that
 * they should use isapnp_readport as the READ_DATA port.
 */
static int
isapnp_isolation_protocol(void)
{
    int			csn;
    struct pnpinfo	*pi;
    u_int8_t		cardid[_PNP_ID_LEN];
    int			ndevs;

    isapnp_send_Initiation_LFSR();
    ndevs = 0;
    
    isapnp_write(CONFIG_CONTROL, 0x04);	/* Reset CSN for All Cards */

    for (csn = 1; ; csn++) {
	/* Wake up cards without a CSN (ie. all of them) */
	isapnp_write(WAKE, 0);
	isapnp_write(SET_RD_DATA, (isapnp_readport >> 2));
	outb(_PNP_ADDRESS, SERIAL_ISOLATION);
	delay(1000);	/* Delay 1 msec */

	if (isapnp_get_serial(cardid)) {
	    isapnp_write(SET_CSN, csn);
	    pi = pnp_allocinfo();
	    ndevs++;
	    pnp_addident(pi, pnp_eisaformat(cardid));
	    /* scan the card obtaining all the identifiers it holds */
	    if (isapnp_scan_resdata(pi)) {
		pnp_freeinfo(pi);	/* error getting data, ignore */
	    } else {
		pnp_addinfo(pi);
	    }
	} else {
	    break;
	}
    }
    /* Move all cards to wait-for-key state */
    while (--csn > 0) {
	isapnp_send_Initiation_LFSR();
	isapnp_write(WAKE, csn);
	isapnp_write(CONFIG_CONTROL, 0x02);
	delay(1000); /* XXX is it really necessary ? */
	csn--;
    }
    return(ndevs);
}

/*
 * Locate ISA-PnP devices and populate the supplied list.
 */
static void
isapnp_enumerate(void) 
{
    int		pnp_rd_port;
    
    /* Check for I/O port access */
    if ((archsw.arch_isainb == NULL) || (archsw.arch_isaoutb == NULL))
	return;

    /* 
     * Validate a possibly-suggested read port value.  If the autoscan failed
     * last time, this will return us to autoscan mode again.
     */
    if ((isapnp_readport > 0) &&
	(((isapnp_readport < 0x203) ||
	  (isapnp_readport > 0x3ff) ||
	  (isapnp_readport & 0x3) != 0x3)))
	 /* invalid, go look for ourselves */
	isapnp_readport = 0;

    if (isapnp_readport < 0) {
	/* someone is telling us there is no ISA in the system */
	return;

    } else if (isapnp_readport > 0) {
	/* Someone has told us where the port is/should be, or we found one last time */
	isapnp_isolation_protocol();

    } else {
	/* No clues, look for it ourselves */
	for (pnp_rd_port = 0x80; pnp_rd_port < 0xff; pnp_rd_port += 0x10) {
	    /* Look for something, quit when we find it */
	    isapnp_readport = (pnp_rd_port << 2) | 0x3;
	    if (isapnp_isolation_protocol() > 0)
		break;
	}
    }
}
OpenPOWER on IntegriCloud