1 | /* |
---|
2 | * This software is Copyright (C) 1998 by T.sqware - all rights limited |
---|
3 | * It is provided in to the public domain "as is", can be freely modified |
---|
4 | * as far as this copyight notice is kept unchanged, but does not imply |
---|
5 | * an endorsement by T.sqware of the product in which it is included. |
---|
6 | * |
---|
7 | * $Id$ |
---|
8 | */ |
---|
9 | |
---|
10 | #include <rtems.h> |
---|
11 | #include <bsp.h> |
---|
12 | #include <assert.h> |
---|
13 | #include <pcibios.h> |
---|
14 | |
---|
15 | /* |
---|
16 | * This is simpliest possible PCI BIOS, it assumes that addressing |
---|
17 | * is flat and that stack is big enough |
---|
18 | */ |
---|
19 | |
---|
20 | |
---|
21 | static int pcibInitialized = 0; |
---|
22 | static unsigned int pcibEntry; |
---|
23 | |
---|
24 | /* |
---|
25 | * Array to pass data between c and asm parts, at the time of |
---|
26 | * writing I am not yet that familiar with extended asm feature |
---|
27 | * of gcc. This code is not on performance path, so we can care |
---|
28 | * relatively little about performance here |
---|
29 | */ |
---|
30 | static volatile unsigned int pcibExchg[5]; |
---|
31 | |
---|
32 | static int pcib_convert_err(int err); |
---|
33 | |
---|
34 | /* |
---|
35 | * Detects presense of PCI BIOS, returns |
---|
36 | * error code |
---|
37 | */ |
---|
38 | int |
---|
39 | pcib_init(void) |
---|
40 | { |
---|
41 | unsigned char *ucp; |
---|
42 | unsigned char sum; |
---|
43 | int i; |
---|
44 | |
---|
45 | pcibInitialized = 0; |
---|
46 | |
---|
47 | /* First, we have to look for BIOS-32 */ |
---|
48 | for(ucp=(unsigned char *)0xE0000; ucp < (unsigned char *)0xFFFFF; ucp+=0x10) |
---|
49 | { |
---|
50 | if(memcmp(ucp, "_32_", 4) != 0) |
---|
51 | { |
---|
52 | continue; |
---|
53 | } |
---|
54 | |
---|
55 | /* Got signature, check length */ |
---|
56 | if(*(ucp + 9) != 1) |
---|
57 | { |
---|
58 | continue; |
---|
59 | } |
---|
60 | |
---|
61 | /* Verify checksum */ |
---|
62 | sum = 0; |
---|
63 | for(i=0; i<16; i++) |
---|
64 | { |
---|
65 | sum += *(ucp+i); |
---|
66 | } |
---|
67 | |
---|
68 | if(sum == 0) |
---|
69 | { |
---|
70 | /* found */ |
---|
71 | break; |
---|
72 | } |
---|
73 | } |
---|
74 | |
---|
75 | if(ucp >= (unsigned char *)0xFFFFF) |
---|
76 | { |
---|
77 | /* BIOS-32 not found */ |
---|
78 | assert(0); |
---|
79 | return PCIB_ERR_NOTPRESENT; |
---|
80 | } |
---|
81 | |
---|
82 | /* BIOS-32 found, let us find PCI BIOS */ |
---|
83 | ucp += 4; |
---|
84 | |
---|
85 | pcibExchg[0] = *(unsigned int *)ucp; |
---|
86 | |
---|
87 | asm (" pusha"); /* Push all registers */ |
---|
88 | asm (" movl pcibExchg, %edi"); /* Move entry point to esi */ |
---|
89 | asm (" movl $0x49435024, %eax"); /* Move signature to eax */ |
---|
90 | asm (" xorl %ebx, %ebx"); /* Zero ebx */ |
---|
91 | asm (" pushl %cs"); |
---|
92 | asm (" call *%edi"); /* Call entry */ |
---|
93 | asm (" movl %eax, pcibExchg"); |
---|
94 | asm (" movl %ebx, pcibExchg+4"); |
---|
95 | asm (" movl %ecx, pcibExchg+8"); |
---|
96 | asm (" movl %edx, pcibExchg+12"); |
---|
97 | asm (" popa"); |
---|
98 | |
---|
99 | if((pcibExchg[0] & 0xff) != 0) |
---|
100 | { |
---|
101 | /* Not found */ |
---|
102 | assert(0); |
---|
103 | return PCIB_ERR_NOTPRESENT; |
---|
104 | } |
---|
105 | |
---|
106 | /* Found PCI entry point */ |
---|
107 | pcibEntry = pcibExchg[1] + pcibExchg[3]; |
---|
108 | |
---|
109 | /* Let us check whether PCI bios is present */ |
---|
110 | pcibExchg[0] = pcibEntry; |
---|
111 | |
---|
112 | asm(" pusha"); |
---|
113 | asm(" movl pcibExchg, %edi"); |
---|
114 | asm(" movb $0xb1, %ah"); |
---|
115 | asm(" movb $0x01, %al"); |
---|
116 | asm (" pushl %cs"); |
---|
117 | asm(" call *%edi"); |
---|
118 | asm(" movl %eax, pcibExchg"); |
---|
119 | asm(" movl %ebx, pcibExchg+4"); |
---|
120 | asm(" movl %ecx, pcibExchg+8"); |
---|
121 | asm(" movl %edx, pcibExchg+12"); |
---|
122 | asm(" popa"); |
---|
123 | |
---|
124 | if((pcibExchg[0] & 0xff00) != 0) |
---|
125 | { |
---|
126 | /* Not found */ |
---|
127 | assert(0); |
---|
128 | return PCIB_ERR_NOTPRESENT; |
---|
129 | } |
---|
130 | |
---|
131 | if(pcibExchg[3] != 0x20494350) |
---|
132 | { |
---|
133 | /* Signature does not match */ |
---|
134 | assert(0); |
---|
135 | return PCIB_ERR_NOTPRESENT; |
---|
136 | } |
---|
137 | |
---|
138 | /* Success */ |
---|
139 | |
---|
140 | pcibInitialized = 1; |
---|
141 | return PCIB_ERR_SUCCESS; |
---|
142 | } |
---|
143 | |
---|
144 | /* |
---|
145 | * Find specified device and return its signature: combination |
---|
146 | * of bus number, device number and function number |
---|
147 | */ |
---|
148 | int |
---|
149 | pcib_find_by_devid(int vendorId, int devId, int idx, int *sig) |
---|
150 | { |
---|
151 | if(!pcibInitialized) |
---|
152 | { |
---|
153 | assert(0); |
---|
154 | return PCIB_ERR_UNINITIALIZED; |
---|
155 | } |
---|
156 | |
---|
157 | pcibExchg[0] = pcibEntry; |
---|
158 | pcibExchg[1] = vendorId; |
---|
159 | pcibExchg[2] = devId; |
---|
160 | pcibExchg[3] = idx; |
---|
161 | |
---|
162 | asm(" pusha"); |
---|
163 | asm(" movl pcibExchg, %edi"); |
---|
164 | asm(" movb $0xb1, %ah"); |
---|
165 | asm(" movb $0x02, %al"); |
---|
166 | asm(" movl pcibExchg+4, %edx"); |
---|
167 | asm(" movl pcibExchg+8, %ecx"); |
---|
168 | asm(" movl pcibExchg+12, %esi"); |
---|
169 | asm(" pushl %cs"); |
---|
170 | asm(" call *%edi"); |
---|
171 | asm(" movl %eax, pcibExchg"); |
---|
172 | asm(" movl %ebx, pcibExchg+4"); |
---|
173 | asm(" popa"); |
---|
174 | |
---|
175 | *sig = pcibExchg[1] & 0xffff; |
---|
176 | |
---|
177 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
178 | } |
---|
179 | |
---|
180 | /* |
---|
181 | * Find specified class code return device signature: combination |
---|
182 | * of bus number, device number and function number |
---|
183 | */ |
---|
184 | int |
---|
185 | pcib_find_by_class(int classCode, int idx, int *sig) |
---|
186 | { |
---|
187 | if(!pcibInitialized) |
---|
188 | { |
---|
189 | assert(0); |
---|
190 | return PCIB_ERR_UNINITIALIZED; |
---|
191 | } |
---|
192 | |
---|
193 | pcibExchg[0] = pcibEntry; |
---|
194 | pcibExchg[1] = classCode; |
---|
195 | pcibExchg[2] = idx; |
---|
196 | |
---|
197 | asm(" pusha"); |
---|
198 | asm(" movl pcibExchg, %edi"); |
---|
199 | asm(" movb $0xb1, %ah"); |
---|
200 | asm(" movb $0x03, %al"); |
---|
201 | asm(" movl pcibExchg+4, %ecx"); |
---|
202 | asm(" movl pcibExchg+8, %esi"); |
---|
203 | asm(" pushl %cs"); |
---|
204 | asm(" call *%edi"); |
---|
205 | asm(" movl %eax, pcibExchg"); |
---|
206 | asm(" movl %ebx, pcibExchg+4"); |
---|
207 | asm(" popa"); |
---|
208 | |
---|
209 | if((pcibExchg[0] & 0xff00) != 0) |
---|
210 | { |
---|
211 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
212 | } |
---|
213 | |
---|
214 | *sig = pcibExchg[1] & 0xffff; |
---|
215 | |
---|
216 | return PCIB_ERR_SUCCESS; |
---|
217 | } |
---|
218 | |
---|
219 | |
---|
220 | |
---|
221 | /* |
---|
222 | * Generate Special Cycle |
---|
223 | */ |
---|
224 | int |
---|
225 | pcib_special_cycle(int busNo, int data) |
---|
226 | { |
---|
227 | if(!pcibInitialized) |
---|
228 | { |
---|
229 | assert(0); |
---|
230 | return PCIB_ERR_UNINITIALIZED; |
---|
231 | } |
---|
232 | |
---|
233 | pcibExchg[0] = pcibEntry; |
---|
234 | pcibExchg[1] = busNo << 8; |
---|
235 | pcibExchg[2] = data; |
---|
236 | |
---|
237 | asm(" pusha"); |
---|
238 | asm(" movl pcibExchg, %edi"); |
---|
239 | asm(" movb $0xb1, %ah"); |
---|
240 | asm(" movb $0x06, %al"); |
---|
241 | asm(" movl pcibExchg+4, %ebx"); |
---|
242 | asm(" movl pcibExchg+8, %edx"); |
---|
243 | asm(" pushl %cs"); |
---|
244 | asm(" call *%edi"); |
---|
245 | asm(" movl %eax, pcibExchg"); |
---|
246 | asm(" movl %ebx, pcibExchg+4"); |
---|
247 | asm(" popa"); |
---|
248 | |
---|
249 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
250 | } |
---|
251 | |
---|
252 | |
---|
253 | /* |
---|
254 | * Read byte from config space |
---|
255 | */ |
---|
256 | int |
---|
257 | pcib_conf_read8(int sig, int off, unsigned char *data) |
---|
258 | { |
---|
259 | if(!pcibInitialized) |
---|
260 | { |
---|
261 | assert(0); |
---|
262 | return PCIB_ERR_UNINITIALIZED; |
---|
263 | } |
---|
264 | |
---|
265 | pcibExchg[0] = pcibEntry; |
---|
266 | pcibExchg[1] = sig; |
---|
267 | pcibExchg[2] = off; |
---|
268 | |
---|
269 | asm(" pusha"); |
---|
270 | asm(" movl pcibExchg, %esi"); |
---|
271 | asm(" movb $0xb1, %ah"); |
---|
272 | asm(" movb $0x08, %al"); |
---|
273 | asm(" movl pcibExchg+4, %ebx"); |
---|
274 | asm(" movl pcibExchg+8, %edi"); |
---|
275 | asm(" pushl %cs"); |
---|
276 | asm(" call *%esi"); |
---|
277 | asm(" movl %eax, pcibExchg"); |
---|
278 | asm(" movl %ecx, pcibExchg+4"); |
---|
279 | asm(" popa"); |
---|
280 | |
---|
281 | if((pcibExchg[0] & 0xff00) != 0) |
---|
282 | { |
---|
283 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
284 | } |
---|
285 | |
---|
286 | *data = (unsigned char)pcibExchg[1] & 0xff; |
---|
287 | |
---|
288 | return PCIB_ERR_SUCCESS; |
---|
289 | } |
---|
290 | |
---|
291 | |
---|
292 | /* |
---|
293 | * Read word from config space |
---|
294 | */ |
---|
295 | int |
---|
296 | pcib_conf_read16(int sig, int off, unsigned short *data) |
---|
297 | { |
---|
298 | if(!pcibInitialized) |
---|
299 | { |
---|
300 | assert(0); |
---|
301 | return PCIB_ERR_UNINITIALIZED; |
---|
302 | } |
---|
303 | |
---|
304 | pcibExchg[0] = pcibEntry; |
---|
305 | pcibExchg[1] = sig; |
---|
306 | pcibExchg[2] = off; |
---|
307 | |
---|
308 | asm(" pusha"); |
---|
309 | asm(" movl pcibExchg, %esi"); |
---|
310 | asm(" movb $0xb1, %ah"); |
---|
311 | asm(" movb $0x09, %al"); |
---|
312 | asm(" movl pcibExchg+4, %ebx"); |
---|
313 | asm(" movl pcibExchg+8, %edi"); |
---|
314 | asm(" pushl %cs"); |
---|
315 | asm(" call *%esi"); |
---|
316 | asm(" movl %eax, pcibExchg"); |
---|
317 | asm(" movl %ecx, pcibExchg+4"); |
---|
318 | asm(" popa"); |
---|
319 | |
---|
320 | if((pcibExchg[0] & 0xff00) != 0) |
---|
321 | { |
---|
322 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
323 | } |
---|
324 | |
---|
325 | *data = (unsigned short)pcibExchg[1] & 0xffff; |
---|
326 | |
---|
327 | return PCIB_ERR_SUCCESS; |
---|
328 | } |
---|
329 | |
---|
330 | |
---|
331 | /* |
---|
332 | * Read dword from config space |
---|
333 | */ |
---|
334 | int |
---|
335 | pcib_conf_read32(int sig, int off, unsigned int *data) |
---|
336 | { |
---|
337 | if(!pcibInitialized) |
---|
338 | { |
---|
339 | assert(0); |
---|
340 | return PCIB_ERR_UNINITIALIZED; |
---|
341 | } |
---|
342 | |
---|
343 | pcibExchg[0] = pcibEntry; |
---|
344 | pcibExchg[1] = sig; |
---|
345 | pcibExchg[2] = off; |
---|
346 | |
---|
347 | asm(" pusha"); |
---|
348 | asm(" movl pcibExchg, %esi"); |
---|
349 | asm(" movb $0xb1, %ah"); |
---|
350 | asm(" movb $0x0a, %al"); |
---|
351 | asm(" movl pcibExchg+4, %ebx"); |
---|
352 | asm(" movl pcibExchg+8, %edi"); |
---|
353 | asm(" pushl %cs"); |
---|
354 | asm(" call *%esi"); |
---|
355 | asm(" movl %eax, pcibExchg"); |
---|
356 | asm(" movl %ecx, pcibExchg+4"); |
---|
357 | asm(" popa"); |
---|
358 | |
---|
359 | if((pcibExchg[0] & 0xff00) != 0) |
---|
360 | { |
---|
361 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
362 | } |
---|
363 | |
---|
364 | *data = (unsigned int)pcibExchg[1]; |
---|
365 | |
---|
366 | return PCIB_ERR_SUCCESS; |
---|
367 | } |
---|
368 | |
---|
369 | |
---|
370 | /* |
---|
371 | * Write byte into config space |
---|
372 | */ |
---|
373 | int |
---|
374 | pcib_conf_write8(int sig, int off, unsigned int data) |
---|
375 | { |
---|
376 | if(!pcibInitialized) |
---|
377 | { |
---|
378 | assert(0); |
---|
379 | return PCIB_ERR_UNINITIALIZED; |
---|
380 | } |
---|
381 | |
---|
382 | pcibExchg[0] = pcibEntry; |
---|
383 | pcibExchg[1] = sig; |
---|
384 | pcibExchg[2] = off; |
---|
385 | pcibExchg[3] = data & 0xff; |
---|
386 | |
---|
387 | asm(" pusha"); |
---|
388 | asm(" movl pcibExchg, %esi"); |
---|
389 | asm(" movb $0xb1, %ah"); |
---|
390 | asm(" movb $0x0b, %al"); |
---|
391 | asm(" movl pcibExchg+4, %ebx"); |
---|
392 | asm(" movl pcibExchg+8, %edi"); |
---|
393 | asm(" movl pcibExchg+12, %ecx"); |
---|
394 | asm(" pushl %cs"); |
---|
395 | asm(" call *%esi"); |
---|
396 | asm(" movl %eax, pcibExchg"); |
---|
397 | asm(" popa"); |
---|
398 | |
---|
399 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
400 | } |
---|
401 | |
---|
402 | /* |
---|
403 | * Write word into config space |
---|
404 | */ |
---|
405 | int |
---|
406 | pcib_conf_write16(int sig, int off, unsigned int data) |
---|
407 | { |
---|
408 | if(!pcibInitialized) |
---|
409 | { |
---|
410 | assert(0); |
---|
411 | return PCIB_ERR_UNINITIALIZED; |
---|
412 | } |
---|
413 | |
---|
414 | pcibExchg[0] = pcibEntry; |
---|
415 | pcibExchg[1] = sig; |
---|
416 | pcibExchg[2] = off; |
---|
417 | pcibExchg[3] = data & 0xffff; |
---|
418 | |
---|
419 | asm(" pusha"); |
---|
420 | asm(" movl pcibExchg, %esi"); |
---|
421 | asm(" movb $0xb1, %ah"); |
---|
422 | asm(" movb $0x0c, %al"); |
---|
423 | asm(" movl pcibExchg+4, %ebx"); |
---|
424 | asm(" movl pcibExchg+8, %edi"); |
---|
425 | asm(" movl pcibExchg+12, %ecx"); |
---|
426 | asm(" pushl %cs"); |
---|
427 | asm(" call *%esi"); |
---|
428 | asm(" movl %eax, pcibExchg"); |
---|
429 | asm(" popa"); |
---|
430 | |
---|
431 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
432 | } |
---|
433 | |
---|
434 | |
---|
435 | |
---|
436 | /* |
---|
437 | * Write dword into config space |
---|
438 | */ |
---|
439 | int |
---|
440 | pcib_conf_write32(int sig, int off, unsigned int data) |
---|
441 | { |
---|
442 | if(!pcibInitialized) |
---|
443 | { |
---|
444 | assert(0); |
---|
445 | return PCIB_ERR_UNINITIALIZED; |
---|
446 | } |
---|
447 | |
---|
448 | pcibExchg[0] = pcibEntry; |
---|
449 | pcibExchg[1] = sig; |
---|
450 | pcibExchg[2] = off; |
---|
451 | pcibExchg[3] = data; |
---|
452 | |
---|
453 | asm(" pusha"); |
---|
454 | asm(" movl pcibExchg, %esi"); |
---|
455 | asm(" movb $0xb1, %ah"); |
---|
456 | asm(" movb $0x0d, %al"); |
---|
457 | asm(" movl pcibExchg+4, %ebx"); |
---|
458 | asm(" movl pcibExchg+8, %edi"); |
---|
459 | asm(" movl pcibExchg+12, %ecx"); |
---|
460 | asm(" pushl %cs"); |
---|
461 | asm(" call *%esi"); |
---|
462 | asm(" movl %eax, pcibExchg"); |
---|
463 | asm(" popa"); |
---|
464 | |
---|
465 | return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); |
---|
466 | } |
---|
467 | |
---|
468 | |
---|
469 | static int |
---|
470 | pcib_convert_err(int err) |
---|
471 | { |
---|
472 | switch(err & 0xff) |
---|
473 | { |
---|
474 | case 0: |
---|
475 | return PCIB_ERR_SUCCESS; |
---|
476 | case 0x81: |
---|
477 | return PCIB_ERR_NOFUNC; |
---|
478 | case 0x83: |
---|
479 | return PCIB_ERR_BADVENDOR; |
---|
480 | case 0x86: |
---|
481 | return PCIB_ERR_DEVNOTFOUND; |
---|
482 | case 0x87: |
---|
483 | return PCIB_ERR_BADREG; |
---|
484 | default: |
---|
485 | assert(0); |
---|
486 | break; |
---|
487 | } |
---|
488 | return PCIB_ERR_NOFUNC; |
---|
489 | } |
---|
490 | |
---|
491 | |
---|
492 | |
---|
493 | |
---|
494 | |
---|
495 | |
---|
496 | |
---|
497 | |
---|
498 | |
---|
499 | |
---|