Merge commit 'jwb/jwb-next'
[linux-2.6] / drivers / char / ipmi / ipmi_smic_sm.c
1 /*
2  * ipmi_smic_sm.c
3  *
4  * The state-machine driver for an IPMI SMIC driver
5  *
6  * It started as a copy of Corey Minyard's driver for the KSC interface
7  * and the kernel patch "mmcdev-patch-245" by HP
8  *
9  * modified by: Hannes Schulz <schulz@schwaar.com>
10  *              ipmi@schwaar.com
11  *
12  *
13  * Corey Minyard's driver for the KSC interface has the following
14  * copyright notice:
15  *   Copyright 2002 MontaVista Software Inc.
16  *
17  * the kernel patch "mmcdev-patch-245" by HP has the following
18  * copyright notice:
19  * (c) Copyright 2001 Grant Grundler (c) Copyright
20  * 2001 Hewlett-Packard Company
21  *
22  *
23  *  This program is free software; you can redistribute it and/or modify it
24  *  under the terms of the GNU General Public License as published by the
25  *  Free Software Foundation; either version 2 of the License, or (at your
26  *  option) any later version.
27  *
28  *
29  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
30  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
31  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
34  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
35  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
36  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
37  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
38  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39  *
40  *  You should have received a copy of the GNU General Public License along
41  *  with this program; if not, write to the Free Software Foundation, Inc.,
42  *  675 Mass Ave, Cambridge, MA 02139, USA.  */
43
44 #include <linux/kernel.h> /* For printk. */
45 #include <linux/string.h>
46 #include <linux/module.h>
47 #include <linux/moduleparam.h>
48 #include <linux/ipmi_msgdefs.h>         /* for completion codes */
49 #include "ipmi_si_sm.h"
50
51 /* smic_debug is a bit-field
52  *      SMIC_DEBUG_ENABLE -     turned on for now
53  *      SMIC_DEBUG_MSG -        commands and their responses
54  *      SMIC_DEBUG_STATES -     state machine
55 */
56 #define SMIC_DEBUG_STATES       4
57 #define SMIC_DEBUG_MSG          2
58 #define SMIC_DEBUG_ENABLE       1
59
60 static int smic_debug = 1;
61 module_param(smic_debug, int, 0644);
62 MODULE_PARM_DESC(smic_debug, "debug bitmask, 1=enable, 2=messages, 4=states");
63
64 enum smic_states {
65         SMIC_IDLE,
66         SMIC_START_OP,
67         SMIC_OP_OK,
68         SMIC_WRITE_START,
69         SMIC_WRITE_NEXT,
70         SMIC_WRITE_END,
71         SMIC_WRITE2READ,
72         SMIC_READ_START,
73         SMIC_READ_NEXT,
74         SMIC_READ_END,
75         SMIC_HOSED
76 };
77
78 #define MAX_SMIC_READ_SIZE 80
79 #define MAX_SMIC_WRITE_SIZE 80
80 #define SMIC_MAX_ERROR_RETRIES 3
81
82 /* Timeouts in microseconds. */
83 #define SMIC_RETRY_TIMEOUT 2000000
84
85 /* SMIC Flags Register Bits */
86 #define SMIC_RX_DATA_READY      0x80
87 #define SMIC_TX_DATA_READY      0x40
88
89 /*
90  * SMIC_SMI and SMIC_EVM_DATA_AVAIL are only used by
91  * a few systems, and then only by Systems Management
92  * Interrupts, not by the OS.  Always ignore these bits.
93  *
94  */
95 #define SMIC_SMI                0x10
96 #define SMIC_EVM_DATA_AVAIL     0x08
97 #define SMIC_SMS_DATA_AVAIL     0x04
98 #define SMIC_FLAG_BSY           0x01
99
100 /* SMIC Error Codes */
101 #define EC_NO_ERROR             0x00
102 #define EC_ABORTED              0x01
103 #define EC_ILLEGAL_CONTROL      0x02
104 #define EC_NO_RESPONSE          0x03
105 #define EC_ILLEGAL_COMMAND      0x04
106 #define EC_BUFFER_FULL          0x05
107
108 struct si_sm_data {
109         enum smic_states state;
110         struct si_sm_io *io;
111         unsigned char    write_data[MAX_SMIC_WRITE_SIZE];
112         int              write_pos;
113         int              write_count;
114         int              orig_write_count;
115         unsigned char    read_data[MAX_SMIC_READ_SIZE];
116         int              read_pos;
117         int              truncated;
118         unsigned int     error_retries;
119         long             smic_timeout;
120 };
121
122 static unsigned int init_smic_data(struct si_sm_data *smic,
123                                    struct si_sm_io *io)
124 {
125         smic->state = SMIC_IDLE;
126         smic->io = io;
127         smic->write_pos = 0;
128         smic->write_count = 0;
129         smic->orig_write_count = 0;
130         smic->read_pos = 0;
131         smic->error_retries = 0;
132         smic->truncated = 0;
133         smic->smic_timeout = SMIC_RETRY_TIMEOUT;
134
135         /* We use 3 bytes of I/O. */
136         return 3;
137 }
138
139 static int start_smic_transaction(struct si_sm_data *smic,
140                                   unsigned char *data, unsigned int size)
141 {
142         unsigned int i;
143
144         if (size < 2)
145                 return IPMI_REQ_LEN_INVALID_ERR;
146         if (size > MAX_SMIC_WRITE_SIZE)
147                 return IPMI_REQ_LEN_EXCEEDED_ERR;
148
149         if ((smic->state != SMIC_IDLE) && (smic->state != SMIC_HOSED))
150                 return IPMI_NOT_IN_MY_STATE_ERR;
151
152         if (smic_debug & SMIC_DEBUG_MSG) {
153                 printk(KERN_DEBUG "start_smic_transaction -");
154                 for (i = 0; i < size; i++)
155                         printk(" %02x", (unsigned char) data[i]);
156                 printk("\n");
157         }
158         smic->error_retries = 0;
159         memcpy(smic->write_data, data, size);
160         smic->write_count = size;
161         smic->orig_write_count = size;
162         smic->write_pos = 0;
163         smic->read_pos = 0;
164         smic->state = SMIC_START_OP;
165         smic->smic_timeout = SMIC_RETRY_TIMEOUT;
166         return 0;
167 }
168
169 static int smic_get_result(struct si_sm_data *smic,
170                            unsigned char *data, unsigned int length)
171 {
172         int i;
173
174         if (smic_debug & SMIC_DEBUG_MSG) {
175                 printk(KERN_DEBUG "smic_get result -");
176                 for (i = 0; i < smic->read_pos; i++)
177                         printk(" %02x", smic->read_data[i]);
178                 printk("\n");
179         }
180         if (length < smic->read_pos) {
181                 smic->read_pos = length;
182                 smic->truncated = 1;
183         }
184         memcpy(data, smic->read_data, smic->read_pos);
185
186         if ((length >= 3) && (smic->read_pos < 3)) {
187                 data[2] = IPMI_ERR_UNSPECIFIED;
188                 smic->read_pos = 3;
189         }
190         if (smic->truncated) {
191                 data[2] = IPMI_ERR_MSG_TRUNCATED;
192                 smic->truncated = 0;
193         }
194         return smic->read_pos;
195 }
196
197 static inline unsigned char read_smic_flags(struct si_sm_data *smic)
198 {
199         return smic->io->inputb(smic->io, 2);
200 }
201
202 static inline unsigned char read_smic_status(struct si_sm_data *smic)
203 {
204         return smic->io->inputb(smic->io, 1);
205 }
206
207 static inline unsigned char read_smic_data(struct si_sm_data *smic)
208 {
209         return smic->io->inputb(smic->io, 0);
210 }
211
212 static inline void write_smic_flags(struct si_sm_data *smic,
213                                     unsigned char   flags)
214 {
215         smic->io->outputb(smic->io, 2, flags);
216 }
217
218 static inline void write_smic_control(struct si_sm_data *smic,
219                                       unsigned char   control)
220 {
221         smic->io->outputb(smic->io, 1, control);
222 }
223
224 static inline void write_si_sm_data(struct si_sm_data *smic,
225                                     unsigned char   data)
226 {
227         smic->io->outputb(smic->io, 0, data);
228 }
229
230 static inline void start_error_recovery(struct si_sm_data *smic, char *reason)
231 {
232         (smic->error_retries)++;
233         if (smic->error_retries > SMIC_MAX_ERROR_RETRIES) {
234                 if (smic_debug & SMIC_DEBUG_ENABLE)
235                         printk(KERN_WARNING
236                                "ipmi_smic_drv: smic hosed: %s\n", reason);
237                 smic->state = SMIC_HOSED;
238         } else {
239                 smic->write_count = smic->orig_write_count;
240                 smic->write_pos = 0;
241                 smic->read_pos = 0;
242                 smic->state = SMIC_START_OP;
243                 smic->smic_timeout = SMIC_RETRY_TIMEOUT;
244         }
245 }
246
247 static inline void write_next_byte(struct si_sm_data *smic)
248 {
249         write_si_sm_data(smic, smic->write_data[smic->write_pos]);
250         (smic->write_pos)++;
251         (smic->write_count)--;
252 }
253
254 static inline void read_next_byte(struct si_sm_data *smic)
255 {
256         if (smic->read_pos >= MAX_SMIC_READ_SIZE) {
257                 read_smic_data(smic);
258                 smic->truncated = 1;
259         } else {
260                 smic->read_data[smic->read_pos] = read_smic_data(smic);
261                 smic->read_pos++;
262         }
263 }
264
265 /*  SMIC Control/Status Code Components */
266 #define SMIC_GET_STATUS         0x00    /* Control form's name */
267 #define SMIC_READY              0x00    /* Status  form's name */
268 #define SMIC_WR_START           0x01    /* Unified Control/Status names... */
269 #define SMIC_WR_NEXT            0x02
270 #define SMIC_WR_END             0x03
271 #define SMIC_RD_START           0x04
272 #define SMIC_RD_NEXT            0x05
273 #define SMIC_RD_END             0x06
274 #define SMIC_CODE_MASK          0x0f
275
276 #define SMIC_CONTROL            0x00
277 #define SMIC_STATUS             0x80
278 #define SMIC_CS_MASK            0x80
279
280 #define SMIC_SMS                0x40
281 #define SMIC_SMM                0x60
282 #define SMIC_STREAM_MASK        0x60
283
284 /*  SMIC Control Codes */
285 #define SMIC_CC_SMS_GET_STATUS  (SMIC_CONTROL|SMIC_SMS|SMIC_GET_STATUS)
286 #define SMIC_CC_SMS_WR_START    (SMIC_CONTROL|SMIC_SMS|SMIC_WR_START)
287 #define SMIC_CC_SMS_WR_NEXT     (SMIC_CONTROL|SMIC_SMS|SMIC_WR_NEXT)
288 #define SMIC_CC_SMS_WR_END      (SMIC_CONTROL|SMIC_SMS|SMIC_WR_END)
289 #define SMIC_CC_SMS_RD_START    (SMIC_CONTROL|SMIC_SMS|SMIC_RD_START)
290 #define SMIC_CC_SMS_RD_NEXT     (SMIC_CONTROL|SMIC_SMS|SMIC_RD_NEXT)
291 #define SMIC_CC_SMS_RD_END      (SMIC_CONTROL|SMIC_SMS|SMIC_RD_END)
292
293 #define SMIC_CC_SMM_GET_STATUS  (SMIC_CONTROL|SMIC_SMM|SMIC_GET_STATUS)
294 #define SMIC_CC_SMM_WR_START    (SMIC_CONTROL|SMIC_SMM|SMIC_WR_START)
295 #define SMIC_CC_SMM_WR_NEXT     (SMIC_CONTROL|SMIC_SMM|SMIC_WR_NEXT)
296 #define SMIC_CC_SMM_WR_END      (SMIC_CONTROL|SMIC_SMM|SMIC_WR_END)
297 #define SMIC_CC_SMM_RD_START    (SMIC_CONTROL|SMIC_SMM|SMIC_RD_START)
298 #define SMIC_CC_SMM_RD_NEXT     (SMIC_CONTROL|SMIC_SMM|SMIC_RD_NEXT)
299 #define SMIC_CC_SMM_RD_END      (SMIC_CONTROL|SMIC_SMM|SMIC_RD_END)
300
301 /*  SMIC Status Codes */
302 #define SMIC_SC_SMS_READY       (SMIC_STATUS|SMIC_SMS|SMIC_READY)
303 #define SMIC_SC_SMS_WR_START    (SMIC_STATUS|SMIC_SMS|SMIC_WR_START)
304 #define SMIC_SC_SMS_WR_NEXT     (SMIC_STATUS|SMIC_SMS|SMIC_WR_NEXT)
305 #define SMIC_SC_SMS_WR_END      (SMIC_STATUS|SMIC_SMS|SMIC_WR_END)
306 #define SMIC_SC_SMS_RD_START    (SMIC_STATUS|SMIC_SMS|SMIC_RD_START)
307 #define SMIC_SC_SMS_RD_NEXT     (SMIC_STATUS|SMIC_SMS|SMIC_RD_NEXT)
308 #define SMIC_SC_SMS_RD_END      (SMIC_STATUS|SMIC_SMS|SMIC_RD_END)
309
310 #define SMIC_SC_SMM_READY       (SMIC_STATUS|SMIC_SMM|SMIC_READY)
311 #define SMIC_SC_SMM_WR_START    (SMIC_STATUS|SMIC_SMM|SMIC_WR_START)
312 #define SMIC_SC_SMM_WR_NEXT     (SMIC_STATUS|SMIC_SMM|SMIC_WR_NEXT)
313 #define SMIC_SC_SMM_WR_END      (SMIC_STATUS|SMIC_SMM|SMIC_WR_END)
314 #define SMIC_SC_SMM_RD_START    (SMIC_STATUS|SMIC_SMM|SMIC_RD_START)
315 #define SMIC_SC_SMM_RD_NEXT     (SMIC_STATUS|SMIC_SMM|SMIC_RD_NEXT)
316 #define SMIC_SC_SMM_RD_END      (SMIC_STATUS|SMIC_SMM|SMIC_RD_END)
317
318 /* these are the control/status codes we actually use
319         SMIC_CC_SMS_GET_STATUS  0x40
320         SMIC_CC_SMS_WR_START    0x41
321         SMIC_CC_SMS_WR_NEXT     0x42
322         SMIC_CC_SMS_WR_END      0x43
323         SMIC_CC_SMS_RD_START    0x44
324         SMIC_CC_SMS_RD_NEXT     0x45
325         SMIC_CC_SMS_RD_END      0x46
326
327         SMIC_SC_SMS_READY       0xC0
328         SMIC_SC_SMS_WR_START    0xC1
329         SMIC_SC_SMS_WR_NEXT     0xC2
330         SMIC_SC_SMS_WR_END      0xC3
331         SMIC_SC_SMS_RD_START    0xC4
332         SMIC_SC_SMS_RD_NEXT     0xC5
333         SMIC_SC_SMS_RD_END      0xC6
334 */
335
336 static enum si_sm_result smic_event(struct si_sm_data *smic, long time)
337 {
338         unsigned char status;
339         unsigned char flags;
340         unsigned char data;
341
342         if (smic->state == SMIC_HOSED) {
343                 init_smic_data(smic, smic->io);
344                 return SI_SM_HOSED;
345         }
346         if (smic->state != SMIC_IDLE) {
347                 if (smic_debug & SMIC_DEBUG_STATES)
348                         printk(KERN_DEBUG
349                                "smic_event - smic->smic_timeout = %ld,"
350                                " time = %ld\n",
351                                smic->smic_timeout, time);
352                 /*
353                  * FIXME: smic_event is sometimes called with time >
354                  * SMIC_RETRY_TIMEOUT
355                  */
356                 if (time < SMIC_RETRY_TIMEOUT) {
357                         smic->smic_timeout -= time;
358                         if (smic->smic_timeout < 0) {
359                                 start_error_recovery(smic, "smic timed out.");
360                                 return SI_SM_CALL_WITH_DELAY;
361                         }
362                 }
363         }
364         flags = read_smic_flags(smic);
365         if (flags & SMIC_FLAG_BSY)
366                 return SI_SM_CALL_WITH_DELAY;
367
368         status = read_smic_status(smic);
369         if (smic_debug & SMIC_DEBUG_STATES)
370                 printk(KERN_DEBUG
371                        "smic_event - state = %d, flags = 0x%02x,"
372                        " status = 0x%02x\n",
373                        smic->state, flags, status);
374
375         switch (smic->state) {
376         case SMIC_IDLE:
377                 /* in IDLE we check for available messages */
378                 if (flags & SMIC_SMS_DATA_AVAIL)
379                         return SI_SM_ATTN;
380                 return SI_SM_IDLE;
381
382         case SMIC_START_OP:
383                 /* sanity check whether smic is really idle */
384                 write_smic_control(smic, SMIC_CC_SMS_GET_STATUS);
385                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
386                 smic->state = SMIC_OP_OK;
387                 break;
388
389         case SMIC_OP_OK:
390                 if (status != SMIC_SC_SMS_READY) {
391                         /* this should not happen */
392                         start_error_recovery(smic,
393                                              "state = SMIC_OP_OK,"
394                                              " status != SMIC_SC_SMS_READY");
395                         return SI_SM_CALL_WITH_DELAY;
396                 }
397                 /* OK so far; smic is idle let us start ... */
398                 write_smic_control(smic, SMIC_CC_SMS_WR_START);
399                 write_next_byte(smic);
400                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
401                 smic->state = SMIC_WRITE_START;
402                 break;
403
404         case SMIC_WRITE_START:
405                 if (status != SMIC_SC_SMS_WR_START) {
406                         start_error_recovery(smic,
407                                              "state = SMIC_WRITE_START, "
408                                              "status != SMIC_SC_SMS_WR_START");
409                         return SI_SM_CALL_WITH_DELAY;
410                 }
411                 /*
412                  * we must not issue WR_(NEXT|END) unless
413                  * TX_DATA_READY is set
414                  * */
415                 if (flags & SMIC_TX_DATA_READY) {
416                         if (smic->write_count == 1) {
417                                 /* last byte */
418                                 write_smic_control(smic, SMIC_CC_SMS_WR_END);
419                                 smic->state = SMIC_WRITE_END;
420                         } else {
421                                 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT);
422                                 smic->state = SMIC_WRITE_NEXT;
423                         }
424                         write_next_byte(smic);
425                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
426                 } else
427                         return SI_SM_CALL_WITH_DELAY;
428                 break;
429
430         case SMIC_WRITE_NEXT:
431                 if (status != SMIC_SC_SMS_WR_NEXT) {
432                         start_error_recovery(smic,
433                                              "state = SMIC_WRITE_NEXT, "
434                                              "status != SMIC_SC_SMS_WR_NEXT");
435                         return SI_SM_CALL_WITH_DELAY;
436                 }
437                 /* this is the same code as in SMIC_WRITE_START */
438                 if (flags & SMIC_TX_DATA_READY) {
439                         if (smic->write_count == 1) {
440                                 write_smic_control(smic, SMIC_CC_SMS_WR_END);
441                                 smic->state = SMIC_WRITE_END;
442                         } else {
443                                 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT);
444                                 smic->state = SMIC_WRITE_NEXT;
445                         }
446                         write_next_byte(smic);
447                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
448                 } else
449                         return SI_SM_CALL_WITH_DELAY;
450                 break;
451
452         case SMIC_WRITE_END:
453                 if (status != SMIC_SC_SMS_WR_END) {
454                         start_error_recovery(smic,
455                                              "state = SMIC_WRITE_END, "
456                                              "status != SMIC_SC_SMS_WR_END");
457                         return SI_SM_CALL_WITH_DELAY;
458                 }
459                 /* data register holds an error code */
460                 data = read_smic_data(smic);
461                 if (data != 0) {
462                         if (smic_debug & SMIC_DEBUG_ENABLE)
463                                 printk(KERN_DEBUG
464                                        "SMIC_WRITE_END: data = %02x\n", data);
465                         start_error_recovery(smic,
466                                              "state = SMIC_WRITE_END, "
467                                              "data != SUCCESS");
468                         return SI_SM_CALL_WITH_DELAY;
469                 } else
470                         smic->state = SMIC_WRITE2READ;
471                 break;
472
473         case SMIC_WRITE2READ:
474                 /*
475                  * we must wait for RX_DATA_READY to be set before we
476                  * can continue
477                  */
478                 if (flags & SMIC_RX_DATA_READY) {
479                         write_smic_control(smic, SMIC_CC_SMS_RD_START);
480                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
481                         smic->state = SMIC_READ_START;
482                 } else
483                         return SI_SM_CALL_WITH_DELAY;
484                 break;
485
486         case SMIC_READ_START:
487                 if (status != SMIC_SC_SMS_RD_START) {
488                         start_error_recovery(smic,
489                                              "state = SMIC_READ_START, "
490                                              "status != SMIC_SC_SMS_RD_START");
491                         return SI_SM_CALL_WITH_DELAY;
492                 }
493                 if (flags & SMIC_RX_DATA_READY) {
494                         read_next_byte(smic);
495                         write_smic_control(smic, SMIC_CC_SMS_RD_NEXT);
496                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
497                         smic->state = SMIC_READ_NEXT;
498                 } else
499                         return SI_SM_CALL_WITH_DELAY;
500                 break;
501
502         case SMIC_READ_NEXT:
503                 switch (status) {
504                 /*
505                  * smic tells us that this is the last byte to be read
506                  * --> clean up
507                  */
508                 case SMIC_SC_SMS_RD_END:
509                         read_next_byte(smic);
510                         write_smic_control(smic, SMIC_CC_SMS_RD_END);
511                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
512                         smic->state = SMIC_READ_END;
513                         break;
514                 case SMIC_SC_SMS_RD_NEXT:
515                         if (flags & SMIC_RX_DATA_READY) {
516                                 read_next_byte(smic);
517                                 write_smic_control(smic, SMIC_CC_SMS_RD_NEXT);
518                                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
519                                 smic->state = SMIC_READ_NEXT;
520                         } else
521                                 return SI_SM_CALL_WITH_DELAY;
522                         break;
523                 default:
524                         start_error_recovery(
525                                 smic,
526                                 "state = SMIC_READ_NEXT, "
527                                 "status != SMIC_SC_SMS_RD_(NEXT|END)");
528                         return SI_SM_CALL_WITH_DELAY;
529                 }
530                 break;
531
532         case SMIC_READ_END:
533                 if (status != SMIC_SC_SMS_READY) {
534                         start_error_recovery(smic,
535                                              "state = SMIC_READ_END, "
536                                              "status != SMIC_SC_SMS_READY");
537                         return SI_SM_CALL_WITH_DELAY;
538                 }
539                 data = read_smic_data(smic);
540                 /* data register holds an error code */
541                 if (data != 0) {
542                         if (smic_debug & SMIC_DEBUG_ENABLE)
543                                 printk(KERN_DEBUG
544                                        "SMIC_READ_END: data = %02x\n", data);
545                         start_error_recovery(smic,
546                                              "state = SMIC_READ_END, "
547                                              "data != SUCCESS");
548                         return SI_SM_CALL_WITH_DELAY;
549                 } else {
550                         smic->state = SMIC_IDLE;
551                         return SI_SM_TRANSACTION_COMPLETE;
552                 }
553
554         case SMIC_HOSED:
555                 init_smic_data(smic, smic->io);
556                 return SI_SM_HOSED;
557
558         default:
559                 if (smic_debug & SMIC_DEBUG_ENABLE) {
560                         printk(KERN_DEBUG "smic->state = %d\n", smic->state);
561                         start_error_recovery(smic, "state = UNKNOWN");
562                         return SI_SM_CALL_WITH_DELAY;
563                 }
564         }
565         smic->smic_timeout = SMIC_RETRY_TIMEOUT;
566         return SI_SM_CALL_WITHOUT_DELAY;
567 }
568
569 static int smic_detect(struct si_sm_data *smic)
570 {
571         /*
572          * It's impossible for the SMIC fnags register to be all 1's,
573          * (assuming a properly functioning, self-initialized BMC)
574          * but that's what you get from reading a bogus address, so we
575          * test that first.
576          */
577         if (read_smic_flags(smic) == 0xff)
578                 return 1;
579
580         return 0;
581 }
582
583 static void smic_cleanup(struct si_sm_data *kcs)
584 {
585 }
586
587 static int smic_size(void)
588 {
589         return sizeof(struct si_sm_data);
590 }
591
592 struct si_sm_handlers smic_smi_handlers = {
593         .init_data         = init_smic_data,
594         .start_transaction = start_smic_transaction,
595         .get_result        = smic_get_result,
596         .event             = smic_event,
597         .detect            = smic_detect,
598         .cleanup           = smic_cleanup,
599         .size              = smic_size,
600 };