2 * Copyright (c) 1998, Michael Smith
3 * Copyright (c) 1996, Sujal M. Patel
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Machine-independant ISA PnP enumerator implementing a subset of the
32 * ISA PnP specification.
36 #include <bootstrap.h>
39 #define inb(x) (archsw.arch_isainb((x)))
40 #define outb(x,y) (archsw.arch_isaoutb((x),(y)))
42 static void isapnp_write(int d, int r);
43 static void isapnp_send_Initiation_LFSR(void);
44 static int isapnp_get_serial(u_int8_t *p);
45 static int isapnp_isolation_protocol(void);
46 static void isapnp_enumerate(void);
48 /* PnP read data port */
49 int isapnp_readport = 0;
53 struct pnphandler isapnphandler =
60 isapnp_write(int d, int r)
62 outb (_PNP_ADDRESS, d);
63 outb (_PNP_WRITE_DATA, r);
67 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
71 isapnp_send_Initiation_LFSR(void)
76 outb(_PNP_ADDRESS, 0);
77 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
80 outb(_PNP_ADDRESS, cur);
82 for (i = 1; i < 32; i++) {
83 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
84 outb(_PNP_ADDRESS, cur);
89 * Get the device's serial number. Returns 1 if the serial is valid.
92 isapnp_get_serial(u_int8_t *data)
94 int i, bit, valid = 0, sum = 0x6a;
96 bzero(data, _PNP_ID_LEN);
97 outb(_PNP_ADDRESS, SERIAL_ISOLATION);
98 for (i = 0; i < 72; i++) {
99 bit = inb(isapnp_readport) == 0x55;
100 delay(250); /* Delay 250 usec */
102 /* Can't Short Circuit the next evaluation, so 'and' is last */
103 bit = (inb(isapnp_readport) == 0xaa) && bit;
104 delay(250); /* Delay 250 usec */
106 valid = valid || bit;
110 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
112 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
115 valid = valid && (data[8] == sum);
121 * Fills the buffer with resource info from the device.
122 * Returns nonzero if the device fails to report
125 isapnp_get_resource_info(u_int8_t *buffer, int len)
130 for (i = 0; i < len; i++) {
131 outb(_PNP_ADDRESS, STATUS);
132 for (j = 0; j < 100; j++) {
133 if ((inb(isapnp_readport)) & 0x1)
138 printf("PnP device failed to report resource data\n");
141 outb(_PNP_ADDRESS, RESOURCE_DATA);
142 temp = inb(isapnp_readport);
150 * Scan Resource Data for useful information.
152 * We scan the resource data for compatible device IDs and
153 * identifier strings; we only take the first identifier string
154 * and assume it's for the card as a whole.
156 * Returns 0 if the scan completed OK, nonzero on error.
159 isapnp_scan_resdata(struct pnpinfo *pi)
161 u_char tag, resinfo[8];
167 while ((limit-- > 0) && !isapnp_get_resource_info(&tag, 1)) {
168 if (PNP_RES_TYPE(tag) == 0) {
170 switch (PNP_SRES_NUM(tag)) {
173 /* Got a compatible device id resource */
174 if (isapnp_get_resource_info(resinfo, PNP_SRES_LEN(tag)))
176 pnp_addident(pi, pnp_eisaformat(resinfo));
183 /* Skip this resource */
184 if (isapnp_get_resource_info(NULL, PNP_SRES_LEN(tag)))
190 if (isapnp_get_resource_info(resinfo, 2))
193 large_len = resinfo[1];
194 large_len = (large_len << 8) + resinfo[0];
196 switch(PNP_LRES_NUM(tag)) {
199 str = malloc(large_len + 1);
200 if (isapnp_get_resource_info(str, (ssize_t)large_len)) {
205 if (pi->pi_desc == NULL) {
206 pi->pi_desc = (char *)str;
213 /* Large resource, skip it */
214 if (isapnp_get_resource_info(NULL, (ssize_t)large_len))
223 * Run the isolation protocol. Upon exiting, all cards are aware that
224 * they should use isapnp_readport as the READ_DATA port.
227 isapnp_isolation_protocol(void)
231 u_int8_t cardid[_PNP_ID_LEN];
234 isapnp_send_Initiation_LFSR();
237 isapnp_write(CONFIG_CONTROL, 0x04); /* Reset CSN for All Cards */
239 for (csn = 1; ; csn++) {
240 /* Wake up cards without a CSN (ie. all of them) */
241 isapnp_write(WAKE, 0);
242 isapnp_write(SET_RD_DATA, (isapnp_readport >> 2));
243 outb(_PNP_ADDRESS, SERIAL_ISOLATION);
244 delay(1000); /* Delay 1 msec */
246 if (isapnp_get_serial(cardid)) {
247 isapnp_write(SET_CSN, csn);
248 pi = pnp_allocinfo();
250 pnp_addident(pi, pnp_eisaformat(cardid));
251 /* scan the card obtaining all the identifiers it holds */
252 if (isapnp_scan_resdata(pi)) {
253 pnp_freeinfo(pi); /* error getting data, ignore */
261 /* Move all cards to wait-for-key state */
263 isapnp_send_Initiation_LFSR();
264 isapnp_write(WAKE, csn);
265 isapnp_write(CONFIG_CONTROL, 0x02);
266 delay(1000); /* XXX is it really necessary ? */
273 * Locate ISA-PnP devices and populate the supplied list.
276 isapnp_enumerate(void)
280 /* Check for I/O port access */
281 if ((archsw.arch_isainb == NULL) || (archsw.arch_isaoutb == NULL))
285 * Validate a possibly-suggested read port value. If the autoscan failed
286 * last time, this will return us to autoscan mode again.
288 if ((isapnp_readport > 0) &&
289 (((isapnp_readport < 0x203) ||
290 (isapnp_readport > 0x3ff) ||
291 (isapnp_readport & 0x3) != 0x3)))
292 /* invalid, go look for ourselves */
295 if (isapnp_readport < 0) {
296 /* someone is telling us there is no ISA in the system */
299 } else if (isapnp_readport > 0) {
300 /* Someone has told us where the port is/should be, or we found one last time */
301 isapnp_isolation_protocol();
304 /* No clues, look for it ourselves */
305 for (pnp_rd_port = 0x80; pnp_rd_port < 0xff; pnp_rd_port += 0x10) {
306 /* Look for something, quit when we find it */
307 isapnp_readport = (pnp_rd_port << 2) | 0x3;
308 if (isapnp_isolation_protocol() > 0)