1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Copyright (c) 2016 Netflix, Inc.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * PnP enumerator using the PCI BIOS.
31 */
32
33 #include <stand.h>
34 #include <machine/stdarg.h>
35 #include <bootstrap.h>
36 #include <isapnp.h>
37 #include <btxv86.h>
38 #include "libi386.h"
39
40 /*
41 * Stupid PCI BIOS interface doesn't let you simply enumerate everything
42 * that's there, instead you have to ask it if it has something.
43 *
44 * So we have to scan by class code, subclass code and sometimes programming
45 * interface.
46 */
47
48 struct pci_progif
49 {
50 int pi_code;
51 const char *pi_name;
52 };
53
54 static struct pci_progif progif_null[] = {
55 {0x0, NULL},
56 {-1, NULL}
57 };
58
59 static struct pci_progif progif_display[] = {
60 {0x0, "VGA"},
61 {0x1, "8514"},
62 {-1, NULL}
63 };
64
65 static struct pci_progif progif_ide[] = {
66 {0x00, NULL},
67 {0x01, NULL},
68 {0x02, NULL},
69 {0x03, NULL},
70 {0x04, NULL},
71 {0x05, NULL},
72 {0x06, NULL},
73 {0x07, NULL},
74 {0x08, NULL},
75 {0x09, NULL},
76 {0x0a, NULL},
77 {0x0b, NULL},
78 {0x0c, NULL},
79 {0x0d, NULL},
80 {0x0e, NULL},
81 {0x0f, NULL},
82 {0x80, NULL},
83 {0x81, NULL},
84 {0x82, NULL},
85 {0x83, NULL},
86 {0x84, NULL},
87 {0x85, NULL},
88 {0x86, NULL},
89 {0x87, NULL},
90 {0x88, NULL},
91 {0x89, NULL},
92 {0x8a, NULL},
93 {0x8b, NULL},
94 {0x8c, NULL},
95 {0x8d, NULL},
96 {0x8e, NULL},
97 {0x8f, NULL},
98 {-1, NULL}
99 };
100
101 static struct pci_progif progif_serial[] = {
102 {0x0, "8250"},
103 {0x1, "16450"},
104 {0x2, "16550"},
105 {-1, NULL}
106 };
107
108 static struct pci_progif progif_parallel[] = {
109 {0x0, "Standard"},
110 {0x1, "Bidirectional"},
111 {0x2, "ECP"},
112 {-1, NULL}
113 };
114
115 static struct pci_progif progif_firewire[] = {
116 {0x10, "OHCI"},
117 {-1, NULL}
118 };
119
120 struct pci_subclass
121 {
122 int ps_subclass;
123 const char *ps_name;
124 struct pci_progif *ps_progif; /* if set, use for programming interface value(s) */
125 };
126
127 static struct pci_subclass subclass_old[] = {
128 {0x0, "Old non-VGA", progif_null},
129 {0x1, "Old VGA", progif_null},
130 {-1, NULL, NULL}
131 };
132
133 static struct pci_subclass subclass_mass[] = {
134 {0x0, "SCSI", progif_null},
135 {0x1, "IDE", progif_ide},
136 {0x2, "Floppy disk", progif_null},
137 {0x3, "IPI", progif_null},
138 {0x4, "RAID", progif_null},
139 {0x80, "mass storage", progif_null},
140 {-1, NULL, NULL}
141 };
142
143 static struct pci_subclass subclass_net[] = {
144 {0x0, "Ethernet", progif_null},
145 {0x1, "Token ring", progif_null},
146 {0x2, "FDDI", progif_null},
147 {0x3, "ATM", progif_null},
148 {0x80, "network", progif_null},
149 {-1, NULL, NULL}
150 };
151
152 static struct pci_subclass subclass_display[] = {
153 {0x0, NULL, progif_display},
154 {0x1, "XGA", progif_null},
155 {0x80, "other", progif_null},
156 {-1, NULL, NULL}
157 };
158
159 static struct pci_subclass subclass_comms[] = {
160 {0x0, "serial", progif_serial},
161 {0x1, "parallel", progif_parallel},
162 {0x80, "communications", progif_null},
163 {-1, NULL, NULL}
164 };
165
166 static struct pci_subclass subclass_serial[] = {
167 {0x0, "FireWire", progif_firewire},
168 {0x1, "ACCESS.bus", progif_null},
169 {0x2, "SSA", progif_null},
170 {0x3, "USB", progif_null},
171 {0x4, "Fibrechannel", progif_null},
172 {-1, NULL, NULL}
173 };
174
175 static struct pci_class
176 {
177 int pc_class;
178 const char *pc_name;
179 struct pci_subclass *pc_subclass;
180 } pci_classes[] = {
181 {0x0, "device", subclass_old},
182 {0x1, "controller", subclass_mass},
183 {0x2, "controller", subclass_net},
184 {0x3, "display", subclass_display},
185 {0x7, "controller", subclass_comms},
186 {0xc, "controller", subclass_serial},
187 {-1, NULL, NULL}
188 };
189
190 static void biospci_enumerate(void);
191 static void biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi);
192
193 struct pnphandler biospcihandler =
194 {
195 "PCI BIOS",
196 biospci_enumerate
197 };
198 static int biospci_version;
199
200 #define PCI_BIOS_PRESENT 0xb101
201 #define FIND_PCI_DEVICE 0xb102
202 #define FIND_PCI_CLASS_CODE 0xb103
203 #define GENERATE_SPECIAL_CYCLE 0xb106
204 #define READ_CONFIG_BYTE 0xb108
205 #define READ_CONFIG_WORD 0xb109
206 #define READ_CONFIG_DWORD 0xb10a
207 #define WRITE_CONFIG_BYTE 0xb10b
208 #define WRITE_CONFIG_WORD 0xb10c
209 #define WRITE_CONFIG_DWORD 0xb10d
210 #define GET_IRQ_ROUTING_OPTIONS 0xb10e
211 #define SET_PCI_IRQ 0xb10f
212
213 #define PCI_INT 0x1a
214
215 #define PCI_SIGNATURE 0x20494350 /* AKA "PCI " */
216
217 void
biospci_detect(void)218 biospci_detect(void)
219 {
220 uint16_t version, hwcap, maxbus;
221 char buf[24];
222
223 /* Find the PCI BIOS */
224 v86.ctl = V86_FLAGS;
225 v86.addr = PCI_INT;
226 v86.eax = PCI_BIOS_PRESENT;
227 v86.edi = 0x0;
228 v86int();
229
230 /* Check for OK response */
231 if (V86_CY(v86.efl) || ((v86.eax & 0xff00) != 0) ||
232 (v86.edx != PCI_SIGNATURE))
233 return;
234
235 version = v86.ebx & 0xffff;
236 hwcap = v86.eax & 0xff;
237 maxbus = v86.ecx & 0xff;
238 #if 0
239 printf("PCI BIOS %d.%d%s%s maxbus %d\n",
240 bcd2bin((version >> 8) & 0xf), bcd2bin(version & 0xf),
241 (hwcap & 1) ? " config1" : "", (hwcap & 2) ? " config2" : "",
242 maxbus);
243 #endif
244 sprintf(buf, "%d", bcd2bin((version >> 8) & 0xf));
245 setenv("pcibios.major", buf, 1);
246 sprintf(buf, "%d", bcd2bin(version & 0xf));
247 setenv("pcibios.minor", buf, 1);
248 sprintf(buf, "%d", !!(hwcap & 1));
249 setenv("pcibios.config1", buf, 1);
250 sprintf(buf, "%d", !!(hwcap & 2));
251 setenv("pcibios.config2", buf, 1);
252 sprintf(buf, "%d", maxbus);
253 setenv("pcibios.maxbus", buf, 1);
254 biospci_version = bcd2bin((version >> 8) & 0xf) * 10 + bcd2bin(version & 0xf);
255 }
256
257 static void
biospci_enumerate(void)258 biospci_enumerate(void)
259 {
260 int device_index, err;
261 uint32_t locator, devid;
262 struct pci_class *pc;
263 struct pci_subclass *psc;
264 struct pci_progif *ppi;
265
266 /* Iterate over known classes */
267 for (pc = pci_classes; pc->pc_class >= 0; pc++) {
268 /* Iterate over subclasses */
269 for (psc = pc->pc_subclass; psc->ps_subclass >= 0; psc++) {
270 /* Iterate over programming interfaces */
271 for (ppi = psc->ps_progif; ppi->pi_code >= 0; ppi++) {
272
273 /* Scan for matches */
274 for (device_index = 0; ; device_index++) {
275 /* Look for a match */
276 err = biospci_find_devclass((pc->pc_class << 16)
277 + (psc->ps_subclass << 8) + ppi->pi_code,
278 device_index, &locator);
279 if (err != 0)
280 break;
281
282 /* Read the device identifier from the nominated device */
283 err = biospci_read_config(locator, 0, BIOSPCI_32BITS, &devid);
284 if (err != 0)
285 break;
286
287 /* We have the device ID, create a PnP object and save everything */
288 biospci_addinfo(devid, pc, psc, ppi);
289 }
290 }
291 }
292 }
293 }
294
295 static void
biospci_addinfo(int devid,struct pci_class * pc,struct pci_subclass * psc,struct pci_progif * ppi)296 biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi)
297 {
298 struct pnpinfo *pi;
299 char desc[80];
300
301
302 /* build the description */
303 desc[0] = 0;
304 if (ppi->pi_name != NULL) {
305 strcat(desc, ppi->pi_name);
306 strcat(desc, " ");
307 }
308 if (psc->ps_name != NULL) {
309 strcat(desc, psc->ps_name);
310 strcat(desc, " ");
311 }
312 if (pc->pc_name != NULL)
313 strcat(desc, pc->pc_name);
314
315 pi = pnp_allocinfo();
316 pi->pi_desc = strdup(desc);
317 sprintf(desc,"0x%08x", devid);
318 pnp_addident(pi, desc);
319 pnp_addinfo(pi);
320 }
321
322 int
biospci_find_devclass(uint32_t class,int index,uint32_t * locator)323 biospci_find_devclass(uint32_t class, int index, uint32_t *locator)
324 {
325 v86.ctl = V86_FLAGS;
326 v86.addr = PCI_INT;
327 v86.eax = FIND_PCI_CLASS_CODE;
328 v86.ecx = class;
329 v86.esi = index;
330 v86int();
331
332 /* error */
333 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
334 return (-1);
335
336 *locator = v86.ebx;
337 return (0);
338 }
339
340 static int
biospci_find_device(uint32_t devid,int index,uint32_t * locator)341 biospci_find_device(uint32_t devid, int index, uint32_t *locator)
342 {
343 v86.ctl = V86_FLAGS;
344 v86.addr = PCI_INT;
345 v86.eax = FIND_PCI_DEVICE;
346 v86.edx = devid & 0xffff; /* EDX - Vendor ID */
347 v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */
348 v86.esi = index;
349 v86int();
350
351 /* error */
352 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
353 return (-1);
354
355 *locator = v86.ebx;
356 return (0);
357 }
358 /*
359 * Configuration space access methods.
360 * width = 0(byte), 1(word) or 2(dword).
361 */
362 int
biospci_write_config(uint32_t locator,int offset,int width,uint32_t val)363 biospci_write_config(uint32_t locator, int offset, int width, uint32_t val)
364 {
365 v86.ctl = V86_FLAGS;
366 v86.addr = PCI_INT;
367 v86.eax = WRITE_CONFIG_BYTE + width;
368 v86.ebx = locator;
369 v86.edi = offset;
370 v86.ecx = val;
371 v86int();
372
373 /* error */
374 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
375 return (-1);
376
377 return(0);
378 }
379
380 int
biospci_read_config(uint32_t locator,int offset,int width,uint32_t * val)381 biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val)
382 {
383 v86.ctl = V86_FLAGS;
384 v86.addr = PCI_INT;
385 v86.eax = READ_CONFIG_BYTE + width;
386 v86.ebx = locator;
387 v86.edi = offset;
388 v86int();
389
390 /* error */
391 if (V86_CY(v86.efl) || (v86.eax & 0xff00))
392 return (-1);
393
394 *val = v86.ecx;
395 return (0);
396 }
397
398 uint32_t
biospci_locator(int8_t bus,uint8_t device,uint8_t function)399 biospci_locator(int8_t bus, uint8_t device, uint8_t function)
400 {
401
402 return ((bus << 8) | ((device & 0x1f) << 3) | (function & 0x7));
403 }
404