release/src-rt-6.x.4708/linux/linux-2.6.36/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                 if (time < SMIC_RETRY_TIMEOUT) {
 353                         smic->smic_timeout -= time;
 354                         if (smic->smic_timeout < 0) {
 355                                 start_error_recovery(smic, "smic timed out.");
 356                                 return SI_SM_CALL_WITH_DELAY;
 357                         }
 358                 }
 359         }
 360         flags = read_smic_flags(smic);
 361         if (flags & SMIC_FLAG_BSY)
 362                 return SI_SM_CALL_WITH_DELAY;
 363
 364         status = read_smic_status(smic);
 365         if (smic_debug & SMIC_DEBUG_STATES)
 366                 printk(KERN_DEBUG
 367                        "smic_event - state = %d, flags = 0x%02x,"
 368                        " status = 0x%02x\n",
 369                        smic->state, flags, status);
 370
 371         switch (smic->state) {
 372         case SMIC_IDLE:
 373                 /* in IDLE we check for available messages */
 374                 if (flags & SMIC_SMS_DATA_AVAIL)
 375                         return SI_SM_ATTN;
 376                 return SI_SM_IDLE;
 377
 378         case SMIC_START_OP:
 379                 /* sanity check whether smic is really idle */
 380                 write_smic_control(smic, SMIC_CC_SMS_GET_STATUS);
 381                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 382                 smic->state = SMIC_OP_OK;
 383                 break;
 384
 385         case SMIC_OP_OK:
 386                 if (status != SMIC_SC_SMS_READY) {
 387                         /* this should not happen */
 388                         start_error_recovery(smic,
 389                                              "state = SMIC_OP_OK,"
 390                                              " status != SMIC_SC_SMS_READY");
 391                         return SI_SM_CALL_WITH_DELAY;
 392                 }
 393                 /* OK so far; smic is idle let us start ... */
 394                 write_smic_control(smic, SMIC_CC_SMS_WR_START);
 395                 write_next_byte(smic);
 396                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 397                 smic->state = SMIC_WRITE_START;
 398                 break;
 399
 400         case SMIC_WRITE_START:
 401                 if (status != SMIC_SC_SMS_WR_START) {
 402                         start_error_recovery(smic,
 403                                              "state = SMIC_WRITE_START, "
 404                                              "status != SMIC_SC_SMS_WR_START");
 405                         return SI_SM_CALL_WITH_DELAY;
 406                 }
 407                 /*
 408                  * we must not issue WR_(NEXT|END) unless
 409                  * TX_DATA_READY is set
 410                  * */
 411                 if (flags & SMIC_TX_DATA_READY) {
 412                         if (smic->write_count == 1) {
 413                                 /* last byte */
 414                                 write_smic_control(smic, SMIC_CC_SMS_WR_END);
 415                                 smic->state = SMIC_WRITE_END;
 416                         } else {
 417                                 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT);
 418                                 smic->state = SMIC_WRITE_NEXT;
 419                         }
 420                         write_next_byte(smic);
 421                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 422                 } else
 423                         return SI_SM_CALL_WITH_DELAY;
 424                 break;
 425
 426         case SMIC_WRITE_NEXT:
 427                 if (status != SMIC_SC_SMS_WR_NEXT) {
 428                         start_error_recovery(smic,
 429                                              "state = SMIC_WRITE_NEXT, "
 430                                              "status != SMIC_SC_SMS_WR_NEXT");
 431                         return SI_SM_CALL_WITH_DELAY;
 432                 }
 433                 /* this is the same code as in SMIC_WRITE_START */
 434                 if (flags & SMIC_TX_DATA_READY) {
 435                         if (smic->write_count == 1) {
 436                                 write_smic_control(smic, SMIC_CC_SMS_WR_END);
 437                                 smic->state = SMIC_WRITE_END;
 438                         } else {
 439                                 write_smic_control(smic, SMIC_CC_SMS_WR_NEXT);
 440                                 smic->state = SMIC_WRITE_NEXT;
 441                         }
 442                         write_next_byte(smic);
 443                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 444                 } else
 445                         return SI_SM_CALL_WITH_DELAY;
 446                 break;
 447
 448         case SMIC_WRITE_END:
 449                 if (status != SMIC_SC_SMS_WR_END) {
 450                         start_error_recovery(smic,
 451                                              "state = SMIC_WRITE_END, "
 452                                              "status != SMIC_SC_SMS_WR_END");
 453                         return SI_SM_CALL_WITH_DELAY;
 454                 }
 455                 /* data register holds an error code */
 456                 data = read_smic_data(smic);
 457                 if (data != 0) {
 458                         if (smic_debug & SMIC_DEBUG_ENABLE)
 459                                 printk(KERN_DEBUG
 460                                        "SMIC_WRITE_END: data = %02x\n", data);
 461                         start_error_recovery(smic,
 462                                              "state = SMIC_WRITE_END, "
 463                                              "data != SUCCESS");
 464                         return SI_SM_CALL_WITH_DELAY;
 465                 } else
 466                         smic->state = SMIC_WRITE2READ;
 467                 break;
 468
 469         case SMIC_WRITE2READ:
 470                 /*
 471                  * we must wait for RX_DATA_READY to be set before we
 472                  * can continue
 473                  */
 474                 if (flags & SMIC_RX_DATA_READY) {
 475                         write_smic_control(smic, SMIC_CC_SMS_RD_START);
 476                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 477                         smic->state = SMIC_READ_START;
 478                 } else
 479                         return SI_SM_CALL_WITH_DELAY;
 480                 break;
 481
 482         case SMIC_READ_START:
 483                 if (status != SMIC_SC_SMS_RD_START) {
 484                         start_error_recovery(smic,
 485                                              "state = SMIC_READ_START, "
 486                                              "status != SMIC_SC_SMS_RD_START");
 487                         return SI_SM_CALL_WITH_DELAY;
 488                 }
 489                 if (flags & SMIC_RX_DATA_READY) {
 490                         read_next_byte(smic);
 491                         write_smic_control(smic, SMIC_CC_SMS_RD_NEXT);
 492                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 493                         smic->state = SMIC_READ_NEXT;
 494                 } else
 495                         return SI_SM_CALL_WITH_DELAY;
 496                 break;
 497
 498         case SMIC_READ_NEXT:
 499                 switch (status) {
 500                 /*
 501                  * smic tells us that this is the last byte to be read
 502                  * --> clean up
 503                  */
 504                 case SMIC_SC_SMS_RD_END:
 505                         read_next_byte(smic);
 506                         write_smic_control(smic, SMIC_CC_SMS_RD_END);
 507                         write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 508                         smic->state = SMIC_READ_END;
 509                         break;
 510                 case SMIC_SC_SMS_RD_NEXT:
 511                         if (flags & SMIC_RX_DATA_READY) {
 512                                 read_next_byte(smic);
 513                                 write_smic_control(smic, SMIC_CC_SMS_RD_NEXT);
 514                                 write_smic_flags(smic, flags | SMIC_FLAG_BSY);
 515                                 smic->state = SMIC_READ_NEXT;
 516                         } else
 517                                 return SI_SM_CALL_WITH_DELAY;
 518                         break;
 519                 default:
 520                         start_error_recovery(
 521                                 smic,
 522                                 "state = SMIC_READ_NEXT, "
 523                                 "status != SMIC_SC_SMS_RD_(NEXT|END)");
 524                         return SI_SM_CALL_WITH_DELAY;
 525                 }
 526                 break;
 527
 528         case SMIC_READ_END:
 529                 if (status != SMIC_SC_SMS_READY) {
 530                         start_error_recovery(smic,
 531                                              "state = SMIC_READ_END, "
 532                                              "status != SMIC_SC_SMS_READY");
 533                         return SI_SM_CALL_WITH_DELAY;
 534                 }
 535                 data = read_smic_data(smic);
 536                 /* data register holds an error code */
 537                 if (data != 0) {
 538                         if (smic_debug & SMIC_DEBUG_ENABLE)
 539                                 printk(KERN_DEBUG
 540                                        "SMIC_READ_END: data = %02x\n", data);
 541                         start_error_recovery(smic,
 542                                              "state = SMIC_READ_END, "
 543                                              "data != SUCCESS");
 544                         return SI_SM_CALL_WITH_DELAY;
 545                 } else {
 546                         smic->state = SMIC_IDLE;
 547                         return SI_SM_TRANSACTION_COMPLETE;
 548                 }
 549
 550         case SMIC_HOSED:
 551                 init_smic_data(smic, smic->io);
 552                 return SI_SM_HOSED;
 553
 554         default:
 555                 if (smic_debug & SMIC_DEBUG_ENABLE) {
 556                         printk(KERN_DEBUG "smic->state = %d\n", smic->state);
 557                         start_error_recovery(smic, "state = UNKNOWN");
 558                         return SI_SM_CALL_WITH_DELAY;
 559                 }
 560         }
 561         smic->smic_timeout = SMIC_RETRY_TIMEOUT;
 562         return SI_SM_CALL_WITHOUT_DELAY;
 563 }
 564
 565 static int smic_detect(struct si_sm_data *smic)
 566 {
 567         /*
 568          * It's impossible for the SMIC fnags register to be all 1's,
 569          * (assuming a properly functioning, self-initialized BMC)
 570          * but that's what you get from reading a bogus address, so we
 571          * test that first.
 572          */
 573         if (read_smic_flags(smic) == 0xff)
 574                 return 1;
 575
 576         return 0;
 577 }
 578
 579 static void smic_cleanup(struct si_sm_data *kcs)
 580 {
 581 }
 582
 583 static int smic_size(void)
 584 {
 585         return sizeof(struct si_sm_data);
 586 }
 587
 588 struct si_sm_handlers smic_smi_handlers = {
 589         .init_data         = init_smic_data,
 590         .start_transaction = start_smic_transaction,
 591         .get_result        = smic_get_result,
 592         .event             = smic_event,
 593         .detect            = smic_detect,
 594         .cleanup           = smic_cleanup,
 595         .size              = smic_size,
 596 };