FreeBSD/Linux Kernel Cross Reference
sys/pci/amdsmb.c
1 #include <sys/cdefs.h>
2 __FBSDID("$FreeBSD$");
3
4 #include <sys/param.h>
5 #include <sys/kernel.h>
6 #include <sys/systm.h>
7 #include <sys/module.h>
8 #include <sys/bus.h>
9 #include <sys/uio.h>
10
11 #include <machine/bus.h>
12 #include <machine/resource.h>
13 #include <sys/rman.h>
14
15 #include <dev/pci/pcivar.h>
16 #include <dev/pci/pcireg.h>
17
18 #include <dev/iicbus/iiconf.h>
19 #include <dev/smbus/smbconf.h>
20 #include "smbus_if.h"
21
22 #define AMDSMB_DEBUG(x) if (amdsmb_debug) (x)
23
24 #ifdef DEBUG
25 static int amdsmb_debug = 1;
26 #else
27 static int amdsmb_debug = 0;
28 #endif
29
30 #define AMDSMB_VENDORID_AMD 0x1022
31 #define AMDSMB_DEVICEID_AMD8111_SMB2 0x746a
32
33 /*
34 * ACPI 3.0, Chapter 12, Embedded Controller Interface.
35 */
36 #define EC_DATA 0x00 /* data register */
37 #define EC_SC 0x04 /* status of controller */
38 #define EC_CMD 0x04 /* command register */
39
40 #define EC_SC_IBF 0x02 /* data ready for embedded controller */
41 #define EC_SC_OBF 0x01 /* data ready for host */
42 #define EC_CMD_WR 0x81 /* write EC */
43 #define EC_CMD_RD 0x80 /* read EC */
44
45 /*
46 * ACPI 3.0, Chapter 12, SMBus Host Controller Interface.
47 */
48 #define SMB_PRTCL 0x00 /* protocol */
49 #define SMB_STS 0x01 /* status */
50 #define SMB_ADDR 0x02 /* address */
51 #define SMB_CMD 0x03 /* command */
52 #define SMB_DATA 0x04 /* 32 data registers */
53 #define SMB_BCNT 0x24 /* number of data bytes */
54 #define SMB_ALRM_A 0x25 /* alarm address */
55 #define SMB_ALRM_D 0x26 /* 2 bytes alarm data */
56
57 #define SMB_STS_DONE 0x80
58 #define SMB_STS_ALRM 0x40
59 #define SMB_STS_RES 0x20
60 #define SMB_STS_STATUS 0x1f
61 #define SMB_STS_OK 0x00 /* OK */
62 #define SMB_STS_UF 0x07 /* Unknown Failure */
63 #define SMB_STS_DANA 0x10 /* Device Address Not Acknowledged */
64 #define SMB_STS_DED 0x11 /* Device Error Detected */
65 #define SMB_STS_DCAD 0x12 /* Device Command Access Denied */
66 #define SMB_STS_UE 0x13 /* Unknown Error */
67 #define SMB_STS_DAD 0x17 /* Device Access Denied */
68 #define SMB_STS_T 0x18 /* Timeout */
69 #define SMB_STS_HUP 0x19 /* Host Unsupported Protocol */
70 #define SMB_STS_B 0x1a /* Busy */
71 #define SMB_STS_PEC 0x1f /* PEC (CRC-8) Error */
72
73 #define SMB_PRTCL_WRITE 0x00
74 #define SMB_PRTCL_READ 0x01
75 #define SMB_PRTCL_QUICK 0x02
76 #define SMB_PRTCL_BYTE 0x04
77 #define SMB_PRTCL_BYTE_DATA 0x06
78 #define SMB_PRTCL_WORD_DATA 0x08
79 #define SMB_PRTCL_BLOCK_DATA 0x0a
80 #define SMB_PRTCL_PROC_CALL 0x0c
81 #define SMB_PRTCL_BLOCK_PROC_CALL 0x0d
82 #define SMB_PRTCL_PEC 0x80
83
84 struct amdsmb_softc {
85 int rid;
86 struct resource *res;
87 bus_space_tag_t smbst;
88 bus_space_handle_t smbsh;
89
90 device_t smbus;
91 };
92
93 #define AMDSMB_ECINB(amdsmb, register) \
94 (bus_space_read_1(amdsmb->smbst, amdsmb->smbsh, register))
95 #define AMDSMB_ECOUTB(amdsmb, register, value) \
96 (bus_space_write_1(amdsmb->smbst, amdsmb->smbsh, register, value))
97
98 static int
99 amdsmb_probe(device_t dev)
100 {
101 u_int16_t vid;
102 u_int16_t did;
103
104 vid = pci_get_vendor(dev);
105 did = pci_get_device(dev);
106
107 if (vid == AMDSMB_VENDORID_AMD) {
108 switch(did) {
109 case AMDSMB_DEVICEID_AMD8111_SMB2:
110 device_set_desc(dev, "AMD-8111 SMBus 2.0 Controller");
111 return (BUS_PROBE_DEFAULT);
112 }
113 }
114
115 return (ENXIO);
116 }
117
118 static int
119 amdsmb_attach(device_t dev)
120 {
121 struct amdsmb_softc *amdsmb_sc = device_get_softc(dev);
122
123 /* Allocate I/O space */
124 amdsmb_sc->rid = PCIR_BAR(0);
125
126 amdsmb_sc->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
127 &amdsmb_sc->rid, RF_ACTIVE);
128
129 if (amdsmb_sc->res == NULL) {
130 device_printf(dev, "could not map i/o space\n");
131 return (ENXIO);
132 }
133
134 amdsmb_sc->smbst = rman_get_bustag(amdsmb_sc->res);
135 amdsmb_sc->smbsh = rman_get_bushandle(amdsmb_sc->res);
136
137 /* Allocate a new smbus device */
138 amdsmb_sc->smbus = device_add_child(dev, "smbus", -1);
139 if (!amdsmb_sc->smbus)
140 return (EINVAL);
141
142 bus_generic_attach(dev);
143
144 return (0);
145 }
146
147 static int
148 amdsmb_detach(device_t dev)
149 {
150 struct amdsmb_softc *amdsmb_sc = device_get_softc(dev);
151
152 if (amdsmb_sc->smbus) {
153 device_delete_child(dev, amdsmb_sc->smbus);
154 amdsmb_sc->smbus = NULL;
155 }
156
157 if (amdsmb_sc->res)
158 bus_release_resource(dev, SYS_RES_IOPORT, amdsmb_sc->rid,
159 amdsmb_sc->res);
160
161 return (0);
162 }
163
164 static int
165 amdsmb_callback(device_t dev, int index, void *data)
166 {
167 int error = 0;
168
169 switch (index) {
170 case SMB_REQUEST_BUS:
171 case SMB_RELEASE_BUS:
172 break;
173 default:
174 error = EINVAL;
175 }
176
177 return (error);
178 }
179
180 static int
181 amdsmb_ec_wait_write(struct amdsmb_softc *sc)
182 {
183 int timeout = 500;
184
185 while (timeout-- && AMDSMB_ECINB(sc, EC_SC) & EC_SC_IBF)
186 DELAY(1);
187 if (timeout == 0) {
188 device_printf(sc->smbus, "timeout waiting for IBF to clear\n");
189 return (1);
190 }
191 return (0);
192 }
193
194 static int
195 amdsmb_ec_wait_read(struct amdsmb_softc *sc)
196 {
197 int timeout = 500;
198
199 while (timeout-- && ~AMDSMB_ECINB(sc, EC_SC) & EC_SC_OBF)
200 DELAY(1);
201 if (timeout == 0) {
202 device_printf(sc->smbus, "timeout waiting for OBF to set\n");
203 return (1);
204 }
205 return (0);
206 }
207
208 static int
209 amdsmb_ec_read(struct amdsmb_softc *sc, u_char addr, u_char *data)
210 {
211
212 if (amdsmb_ec_wait_write(sc))
213 return (1);
214 AMDSMB_ECOUTB(sc, EC_CMD, EC_CMD_RD);
215
216 if (amdsmb_ec_wait_write(sc))
217 return (1);
218 AMDSMB_ECOUTB(sc, EC_DATA, addr);
219
220 if (amdsmb_ec_wait_read(sc))
221 return (1);
222 *data = AMDSMB_ECINB(sc, EC_DATA);
223
224 return (0);
225 }
226
227 static int
228 amdsmb_ec_write(struct amdsmb_softc *sc, u_char addr, u_char data)
229 {
230
231 if (amdsmb_ec_wait_write(sc))
232 return (1);
233 AMDSMB_ECOUTB(sc, EC_CMD, EC_CMD_WR);
234
235 if (amdsmb_ec_wait_write(sc))
236 return (1);
237 AMDSMB_ECOUTB(sc, EC_DATA, addr);
238
239 if (amdsmb_ec_wait_write(sc))
240 return (1);
241 AMDSMB_ECOUTB(sc, EC_DATA, data);
242
243 return (0);
244 }
245
246 static int
247 amdsmb_wait(struct amdsmb_softc *sc)
248 {
249 u_char sts, temp;
250 int error, count;
251
252 amdsmb_ec_read(sc, SMB_PRTCL, &temp);
253 if (temp != 0)
254 {
255 count = 10000;
256 do {
257 DELAY(500);
258 amdsmb_ec_read(sc, SMB_PRTCL, &temp);
259 } while (temp != 0 && count--);
260 if (count == 0)
261 return (SMB_ETIMEOUT);
262 }
263
264 amdsmb_ec_read(sc, SMB_STS, &sts);
265 sts &= SMB_STS_STATUS;
266 AMDSMB_DEBUG(printf("amdsmb: STS=0x%x\n", sts));
267
268 switch (sts) {
269 case SMB_STS_OK:
270 error = SMB_ENOERR;
271 break;
272 case SMB_STS_DANA:
273 error = SMB_ENOACK;
274 break;
275 case SMB_STS_B:
276 error = SMB_EBUSY;
277 break;
278 case SMB_STS_T:
279 error = SMB_ETIMEOUT;
280 break;
281 case SMB_STS_DCAD:
282 case SMB_STS_DAD:
283 case SMB_STS_HUP:
284 error = SMB_ENOTSUPP;
285 break;
286 default:
287 error = SMB_EBUSERR;
288 break;
289 }
290
291 return (error);
292 }
293
294 static int
295 amdsmb_quick(device_t dev, u_char slave, int how)
296 {
297 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
298 u_char protocol;
299 int error;
300
301 protocol = SMB_PRTCL_QUICK;
302
303 switch (how) {
304 case SMB_QWRITE:
305 protocol |= SMB_PRTCL_WRITE;
306 AMDSMB_DEBUG(printf("amdsmb: QWRITE to 0x%x", slave));
307 break;
308 case SMB_QREAD:
309 protocol |= SMB_PRTCL_READ;
310 AMDSMB_DEBUG(printf("amdsmb: QREAD to 0x%x", slave));
311 break;
312 default:
313 panic("%s: unknown QUICK command (%x)!", __func__, how);
314 }
315
316 amdsmb_ec_write(sc, SMB_ADDR, slave);
317 amdsmb_ec_write(sc, SMB_PRTCL, protocol);
318
319 error = amdsmb_wait(sc);
320
321 AMDSMB_DEBUG(printf(", error=0x%x\n", error));
322
323 return (error);
324 }
325
326 static int
327 amdsmb_sendb(device_t dev, u_char slave, char byte)
328 {
329 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
330 int error;
331
332 amdsmb_ec_write(sc, SMB_CMD, byte);
333 amdsmb_ec_write(sc, SMB_ADDR, slave);
334 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE);
335
336 error = amdsmb_wait(sc);
337
338 AMDSMB_DEBUG(printf("amdsmb: SENDB to 0x%x, byte=0x%x, error=0x%x\n",
339 slave, byte, error));
340
341 return (error);
342 }
343
344 static int
345 amdsmb_recvb(device_t dev, u_char slave, char *byte)
346 {
347 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
348 int error;
349
350 amdsmb_ec_write(sc, SMB_ADDR, slave);
351 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE);
352
353 if ((error = amdsmb_wait(sc)) == SMB_ENOERR)
354 amdsmb_ec_read(sc, SMB_DATA, byte);
355
356 AMDSMB_DEBUG(printf("amdsmb: RECVB from 0x%x, byte=0x%x, error=0x%x\n",
357 slave, *byte, error));
358
359 return (error);
360 }
361
362 static int
363 amdsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
364 {
365 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
366 int error;
367
368 amdsmb_ec_write(sc, SMB_CMD, cmd);
369 amdsmb_ec_write(sc, SMB_DATA, byte);
370 amdsmb_ec_write(sc, SMB_ADDR, slave);
371 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE_DATA);
372
373 error = amdsmb_wait(sc);
374
375 AMDSMB_DEBUG(printf("amdsmb: WRITEB to 0x%x, cmd=0x%x, byte=0x%x, "
376 "error=0x%x\n", slave, cmd, byte, error));
377
378 return (error);
379 }
380
381 static int
382 amdsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
383 {
384 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
385 int error;
386
387 amdsmb_ec_write(sc, SMB_CMD, cmd);
388 amdsmb_ec_write(sc, SMB_ADDR, slave);
389 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE_DATA);
390
391 if ((error = amdsmb_wait(sc)) == SMB_ENOERR)
392 amdsmb_ec_read(sc, SMB_DATA, byte);
393
394 AMDSMB_DEBUG(printf("amdsmb: READB from 0x%x, cmd=0x%x, byte=0x%x, "
395 "error=0x%x\n", slave, cmd, (unsigned char)*byte, error));
396
397 return (error);
398 }
399
400 static int
401 amdsmb_writew(device_t dev, u_char slave, char cmd, short word)
402 {
403 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
404 int error;
405
406 amdsmb_ec_write(sc, SMB_CMD, cmd);
407 amdsmb_ec_write(sc, SMB_DATA, word);
408 amdsmb_ec_write(sc, SMB_DATA + 1, word >> 8);
409 amdsmb_ec_write(sc, SMB_ADDR, slave);
410 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_WORD_DATA);
411
412 error = amdsmb_wait(sc);
413
414 AMDSMB_DEBUG(printf("amdsmb: WRITEW to 0x%x, cmd=0x%x, word=0x%x, "
415 "error=0x%x\n", slave, cmd, word, error));
416
417 return (error);
418 }
419
420 static int
421 amdsmb_readw(device_t dev, u_char slave, char cmd, short *word)
422 {
423 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
424 u_char temp[2];
425 int error;
426
427 amdsmb_ec_write(sc, SMB_CMD, cmd);
428 amdsmb_ec_write(sc, SMB_ADDR, slave);
429 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_WORD_DATA);
430
431 if ((error = amdsmb_wait(sc)) == SMB_ENOERR) {
432 amdsmb_ec_read(sc, SMB_DATA + 0, &temp[0]);
433 amdsmb_ec_read(sc, SMB_DATA + 1, &temp[1]);
434 *word = temp[0] | (temp[1] << 8);
435 }
436
437 AMDSMB_DEBUG(printf("amdsmb: READW from 0x%x, cmd=0x%x, word=0x%x, "
438 "error=0x%x\n", slave, cmd, (unsigned short)*word, error));
439
440 return (error);
441 }
442
443 static int
444 amdsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
445 {
446 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
447 u_char i;
448 int error;
449
450 if (count < 1 || count > 32)
451 return (SMB_EINVAL);
452 amdsmb_ec_write(sc, SMB_CMD, cmd);
453 amdsmb_ec_write(sc, SMB_BCNT, count);
454 for (i = 0; i < count; i++)
455 amdsmb_ec_write(sc, SMB_DATA + i, buf[i]);
456 amdsmb_ec_write(sc, SMB_ADDR, slave);
457 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BLOCK_DATA);
458
459 error = amdsmb_wait(sc);
460
461 AMDSMB_DEBUG(printf("amdsmb: WRITEBLK to 0x%x, count=0x%x, cmd=0x%x, "
462 "error=0x%x", slave, count, cmd, error));
463
464 return (error);
465 }
466
467 static int
468 amdsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
469 {
470 struct amdsmb_softc *sc = (struct amdsmb_softc *)device_get_softc(dev);
471 u_char data, len, i;
472 int error;
473
474 if (*count < 1 || *count > 32)
475 return (SMB_EINVAL);
476 amdsmb_ec_write(sc, SMB_CMD, cmd);
477 amdsmb_ec_write(sc, SMB_ADDR, slave);
478 amdsmb_ec_write(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BLOCK_DATA);
479
480 if ((error = amdsmb_wait(sc)) == SMB_ENOERR) {
481 amdsmb_ec_read(sc, SMB_BCNT, &len);
482 for (i = 0; i < len; i++) {
483 amdsmb_ec_read(sc, SMB_DATA + i, &data);
484 if (i < *count)
485 buf[i] = data;
486 }
487 *count = len;
488 }
489
490 AMDSMB_DEBUG(printf("amdsmb: READBLK to 0x%x, count=0x%x, cmd=0x%x, "
491 "error=0x%x", slave, *count, cmd, error));
492
493 return (error);
494 }
495
496 static device_method_t amdsmb_methods[] = {
497 /* Device interface */
498 DEVMETHOD(device_probe, amdsmb_probe),
499 DEVMETHOD(device_attach, amdsmb_attach),
500 DEVMETHOD(device_detach, amdsmb_detach),
501
502 /* SMBus interface */
503 DEVMETHOD(smbus_callback, amdsmb_callback),
504 DEVMETHOD(smbus_quick, amdsmb_quick),
505 DEVMETHOD(smbus_sendb, amdsmb_sendb),
506 DEVMETHOD(smbus_recvb, amdsmb_recvb),
507 DEVMETHOD(smbus_writeb, amdsmb_writeb),
508 DEVMETHOD(smbus_readb, amdsmb_readb),
509 DEVMETHOD(smbus_writew, amdsmb_writew),
510 DEVMETHOD(smbus_readw, amdsmb_readw),
511 DEVMETHOD(smbus_bwrite, amdsmb_bwrite),
512 DEVMETHOD(smbus_bread, amdsmb_bread),
513
514 { 0, 0 }
515 };
516
517 static devclass_t amdsmb_devclass;
518
519 static driver_t amdsmb_driver = {
520 "amdsmb",
521 amdsmb_methods,
522 sizeof(struct amdsmb_softc),
523 };
524
525 DRIVER_MODULE(amdsmb, pci, amdsmb_driver, amdsmb_devclass, 0, 0);
526 DRIVER_MODULE(smbus, amdsmb, smbus_driver, smbus_devclass, 0, 0);
527
528 MODULE_DEPEND(amdsmb, pci, 1, 1, 1);
529 MODULE_DEPEND(amdsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
530 MODULE_VERSION(amdsmb, 1);
Cache object: 9d70dfbafa32e2955ec16e48a790d879
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