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1da177e4 LT |
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> | |
c4edff1c CM |
46 | #include <linux/module.h> |
47 | #include <linux/moduleparam.h> | |
1da177e4 LT |
48 | #include <linux/ipmi_msgdefs.h> /* for completion codes */ |
49 | #include "ipmi_si_sm.h" | |
50 | ||
1da177e4 LT |
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; | |
c4edff1c CM |
61 | module_param(smic_debug, int, 0644); |
62 | MODULE_PARM_DESC(smic_debug, "debug bitmask, 1=enable, 2=messages, 4=states"); | |
1da177e4 LT |
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. */ | |
ccb3368c | 83 | #define SMIC_RETRY_TIMEOUT (2*USEC_PER_SEC) |
1da177e4 LT |
84 | |
85 | /* SMIC Flags Register Bits */ | |
86 | #define SMIC_RX_DATA_READY 0x80 | |
87 | #define SMIC_TX_DATA_READY 0x40 | |
c305e3d3 | 88 | |
d5a2b89a CM |
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 | */ | |
1da177e4 LT |
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 | ||
c305e3d3 | 108 | struct si_sm_data { |
1da177e4 LT |
109 | enum smic_states state; |
110 | struct si_sm_io *io; | |
c305e3d3 CM |
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; | |
1da177e4 LT |
120 | }; |
121 | ||
c305e3d3 CM |
122 | static unsigned int init_smic_data(struct si_sm_data *smic, |
123 | struct si_sm_io *io) | |
1da177e4 LT |
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 | ||
4d7cbac7 CM |
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 | ||
1da177e4 | 152 | if (smic_debug & SMIC_DEBUG_MSG) { |
c305e3d3 CM |
153 | printk(KERN_DEBUG "start_smic_transaction -"); |
154 | for (i = 0; i < size; i++) | |
155 | printk(" %02x", (unsigned char) data[i]); | |
156 | printk("\n"); | |
1da177e4 LT |
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) { | |
c305e3d3 CM |
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"); | |
1da177e4 LT |
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 | ||
c305e3d3 CM |
224 | static inline void write_si_sm_data(struct si_sm_data *smic, |
225 | unsigned char data) | |
1da177e4 LT |
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) { | |
c305e3d3 | 234 | if (smic_debug & SMIC_DEBUG_ENABLE) |
1da177e4 LT |
235 | printk(KERN_WARNING |
236 | "ipmi_smic_drv: smic hosed: %s\n", reason); | |
1da177e4 LT |
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 | ||
c305e3d3 | 254 | static inline void read_next_byte(struct si_sm_data *smic) |
1da177e4 LT |
255 | { |
256 | if (smic->read_pos >= MAX_SMIC_READ_SIZE) { | |
c305e3d3 | 257 | read_smic_data(smic); |
1da177e4 LT |
258 | smic->truncated = 1; |
259 | } else { | |
260 | smic->read_data[smic->read_pos] = read_smic_data(smic); | |
c305e3d3 | 261 | smic->read_pos++; |
1da177e4 LT |
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 | ||
c305e3d3 | 336 | static enum si_sm_result smic_event(struct si_sm_data *smic, long time) |
1da177e4 LT |
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) { | |
c305e3d3 CM |
347 | if (smic_debug & SMIC_DEBUG_STATES) |
348 | printk(KERN_DEBUG | |
1da177e4 LT |
349 | "smic_event - smic->smic_timeout = %ld," |
350 | " time = %ld\n", | |
351 | smic->smic_timeout, time); | |
c305e3d3 CM |
352 | /* |
353 | * FIXME: smic_event is sometimes called with time > | |
354 | * SMIC_RETRY_TIMEOUT | |
355 | */ | |
1da177e4 LT |
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 | ||
c305e3d3 | 368 | status = read_smic_status(smic); |
1da177e4 | 369 | if (smic_debug & SMIC_DEBUG_STATES) |
c305e3d3 | 370 | printk(KERN_DEBUG |
1da177e4 LT |
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 */ | |
d5a2b89a | 378 | if (flags & SMIC_SMS_DATA_AVAIL) |
1da177e4 | 379 | return SI_SM_ATTN; |
1da177e4 LT |
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) { | |
c305e3d3 | 391 | /* this should not happen */ |
1da177e4 LT |
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 | } | |
c305e3d3 CM |
411 | /* |
412 | * we must not issue WR_(NEXT|END) unless | |
413 | * TX_DATA_READY is set | |
414 | * */ | |
1da177e4 LT |
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); | |
c305e3d3 | 426 | } else |
1da177e4 | 427 | return SI_SM_CALL_WITH_DELAY; |
1da177e4 LT |
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; | |
c305e3d3 | 442 | } else { |
1da177e4 LT |
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); | |
c305e3d3 | 448 | } else |
1da177e4 | 449 | return SI_SM_CALL_WITH_DELAY; |
1da177e4 LT |
450 | break; |
451 | ||
452 | case SMIC_WRITE_END: | |
453 | if (status != SMIC_SC_SMS_WR_END) { | |
c305e3d3 CM |
454 | start_error_recovery(smic, |
455 | "state = SMIC_WRITE_END, " | |
456 | "status != SMIC_SC_SMS_WR_END"); | |
1da177e4 LT |
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) { | |
c305e3d3 CM |
462 | if (smic_debug & SMIC_DEBUG_ENABLE) |
463 | printk(KERN_DEBUG | |
1da177e4 | 464 | "SMIC_WRITE_END: data = %02x\n", data); |
1da177e4 LT |
465 | start_error_recovery(smic, |
466 | "state = SMIC_WRITE_END, " | |
467 | "data != SUCCESS"); | |
468 | return SI_SM_CALL_WITH_DELAY; | |
c305e3d3 | 469 | } else |
1da177e4 | 470 | smic->state = SMIC_WRITE2READ; |
1da177e4 LT |
471 | break; |
472 | ||
473 | case SMIC_WRITE2READ: | |
c305e3d3 CM |
474 | /* |
475 | * we must wait for RX_DATA_READY to be set before we | |
476 | * can continue | |
477 | */ | |
1da177e4 LT |
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; | |
c305e3d3 | 482 | } else |
1da177e4 | 483 | return SI_SM_CALL_WITH_DELAY; |
1da177e4 LT |
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; | |
c305e3d3 | 498 | } else |
1da177e4 | 499 | return SI_SM_CALL_WITH_DELAY; |
1da177e4 LT |
500 | break; |
501 | ||
502 | case SMIC_READ_NEXT: | |
503 | switch (status) { | |
c305e3d3 CM |
504 | /* |
505 | * smic tells us that this is the last byte to be read | |
506 | * --> clean up | |
507 | */ | |
1da177e4 LT |
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; | |
c305e3d3 | 520 | } else |
1da177e4 | 521 | return SI_SM_CALL_WITH_DELAY; |
1da177e4 LT |
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) { | |
c305e3d3 CM |
542 | if (smic_debug & SMIC_DEBUG_ENABLE) |
543 | printk(KERN_DEBUG | |
1da177e4 | 544 | "SMIC_READ_END: data = %02x\n", data); |
1da177e4 LT |
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) { | |
c305e3d3 | 560 | printk(KERN_DEBUG "smic->state = %d\n", smic->state); |
1da177e4 LT |
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 | { | |
c305e3d3 CM |
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 | */ | |
1da177e4 LT |
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 | ||
81d02b7f | 592 | const struct si_sm_handlers smic_smi_handlers = { |
1da177e4 LT |
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 | }; |