drivers/char/ipmi/ipmi_si_intf.c

   1 /*
   2  * ipmi_si.c
   3  *
   4  * The interface to the IPMI driver for the system interfaces (KCS, SMIC,
   5  * BT).
   6  *
   7  * Author: MontaVista Software, Inc.
   8  *         Corey Minyard <minyard@mvista.com>
   9  *         source@mvista.com
  10  *
  11  * Copyright 2002 MontaVista Software Inc.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify it
  14  *  under the terms of the GNU General Public License as published by the
  15  *  Free Software Foundation; either version 2 of the License, or (at your
  16  *  option) any later version.
  17  *
  18  *
  19  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  25  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  27  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  28  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  *  You should have received a copy of the GNU General Public License along
  31  *  with this program; if not, write to the Free Software Foundation, Inc.,
  32  *  675 Mass Ave, Cambridge, MA 02139, USA.
  33  */
  34
  35 /*
  36  * This file holds the "policy" for the interface to the SMI state
  37  * machine.  It does the configuration, handles timers and interrupts,
  38  * and drives the real SMI state machine.
  39  */
  40
  41 #include <linux/config.h>
  42 #include <linux/module.h>
  43 #include <linux/moduleparam.h>
  44 #include <asm/system.h>
  45 #include <linux/sched.h>
  46 #include <linux/timer.h>
  47 #include <linux/errno.h>
  48 #include <linux/spinlock.h>
  49 #include <linux/slab.h>
  50 #include <linux/delay.h>
  51 #include <linux/list.h>
  52 #include <linux/pci.h>
  53 #include <linux/ioport.h>
  54 #include <asm/irq.h>
  55 #ifdef CONFIG_HIGH_RES_TIMERS
  56 #include <linux/hrtime.h>
  57 # if defined(schedule_next_int)
  58 /* Old high-res timer code, do translations. */
  59 #  define get_arch_cycles(a) quick_update_jiffies_sub(a)
  60 #  define arch_cycles_per_jiffy cycles_per_jiffies
  61 # endif
  62 static inline void add_usec_to_timer(struct timer_list *t, long v)
  63 {
  64         t->sub_expires += nsec_to_arch_cycle(v * 1000);
  65         while (t->sub_expires >= arch_cycles_per_jiffy)
  66         {
  67                 t->expires++;
  68                 t->sub_expires -= arch_cycles_per_jiffy;
  69         }
  70 }
  71 #endif
  72 #include <linux/interrupt.h>
  73 #include <linux/rcupdate.h>
  74 #include <linux/ipmi_smi.h>
  75 #include <asm/io.h>
  76 #include "ipmi_si_sm.h"
  77 #include <linux/init.h>
  78
  79 #define IPMI_SI_VERSION "v33"
  80
  81 /* Measure times between events in the driver. */
  82 #undef DEBUG_TIMING
  83
  84 /* Call every 10 ms. */
  85 #define SI_TIMEOUT_TIME_USEC    10000
  86 #define SI_USEC_PER_JIFFY       (1000000/HZ)
  87 #define SI_TIMEOUT_JIFFIES      (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY)
  88 #define SI_SHORT_TIMEOUT_USEC  250 /* .25ms when the SM request a
  89                                        short timeout */
  90
  91 enum si_intf_state {
  92         SI_NORMAL,
  93         SI_GETTING_FLAGS,
  94         SI_GETTING_EVENTS,
  95         SI_CLEARING_FLAGS,
  96         SI_CLEARING_FLAGS_THEN_SET_IRQ,
  97         SI_GETTING_MESSAGES,
  98         SI_ENABLE_INTERRUPTS1,
  99         SI_ENABLE_INTERRUPTS2
 100         /* FIXME - add watchdog stuff. */
 101 };
 102
 103 enum si_type {
 104     SI_KCS, SI_SMIC, SI_BT
 105 };
 106
 107 struct smi_info
 108 {
 109         ipmi_smi_t             intf;
 110         struct si_sm_data      *si_sm;
 111         struct si_sm_handlers  *handlers;
 112         enum si_type           si_type;
 113         spinlock_t             si_lock;
 114         spinlock_t             msg_lock;
 115         struct list_head       xmit_msgs;
 116         struct list_head       hp_xmit_msgs;
 117         struct ipmi_smi_msg    *curr_msg;
 118         enum si_intf_state     si_state;
 119
 120         /* Used to handle the various types of I/O that can occur with
 121            IPMI */
 122         struct si_sm_io io;
 123         int (*io_setup)(struct smi_info *info);
 124         void (*io_cleanup)(struct smi_info *info);
 125         int (*irq_setup)(struct smi_info *info);
 126         void (*irq_cleanup)(struct smi_info *info);
 127         unsigned int io_size;
 128
 129         /* Flags from the last GET_MSG_FLAGS command, used when an ATTN
 130            is set to hold the flags until we are done handling everything
 131            from the flags. */
 132 #define RECEIVE_MSG_AVAIL       0x01
 133 #define EVENT_MSG_BUFFER_FULL   0x02
 134 #define WDT_PRE_TIMEOUT_INT     0x08
 135         unsigned char       msg_flags;
 136
 137         /* If set to true, this will request events the next time the
 138            state machine is idle. */
 139         atomic_t            req_events;
 140
 141         /* If true, run the state machine to completion on every send
 142            call.  Generally used after a panic to make sure stuff goes
 143            out. */
 144         int                 run_to_completion;
 145
 146         /* The I/O port of an SI interface. */
 147         int                 port;
 148
 149         /* The space between start addresses of the two ports.  For
 150            instance, if the first port is 0xca2 and the spacing is 4, then
 151            the second port is 0xca6. */
 152         unsigned int        spacing;
 153
 154         /* zero if no irq; */
 155         int                 irq;
 156
 157         /* The timer for this si. */
 158         struct timer_list   si_timer;
 159
 160         /* The time (in jiffies) the last timeout occurred at. */
 161         unsigned long       last_timeout_jiffies;
 162
 163         /* Used to gracefully stop the timer without race conditions. */
 164         volatile int        stop_operation;
 165         volatile int        timer_stopped;
 166
 167         /* The driver will disable interrupts when it gets into a
 168            situation where it cannot handle messages due to lack of
 169            memory.  Once that situation clears up, it will re-enable
 170            interrupts. */
 171         int interrupt_disabled;
 172
 173         unsigned char ipmi_si_dev_rev;
 174         unsigned char ipmi_si_fw_rev_major;
 175         unsigned char ipmi_si_fw_rev_minor;
 176         unsigned char ipmi_version_major;
 177         unsigned char ipmi_version_minor;
 178
 179         /* Slave address, could be reported from DMI. */
 180         unsigned char slave_addr;
 181
 182         /* Counters and things for the proc filesystem. */
 183         spinlock_t count_lock;
 184         unsigned long short_timeouts;
 185         unsigned long long_timeouts;
 186         unsigned long timeout_restarts;
 187         unsigned long idles;
 188         unsigned long interrupts;
 189         unsigned long attentions;
 190         unsigned long flag_fetches;
 191         unsigned long hosed_count;
 192         unsigned long complete_transactions;
 193         unsigned long events;
 194         unsigned long watchdog_pretimeouts;
 195         unsigned long incoming_messages;
 196 };
 197
 198 static void si_restart_short_timer(struct smi_info *smi_info);
 199
 200 static void deliver_recv_msg(struct smi_info *smi_info,
 201                              struct ipmi_smi_msg *msg)
 202 {
 203         /* Deliver the message to the upper layer with the lock
 204            released. */
 205         spin_unlock(&(smi_info->si_lock));
 206         ipmi_smi_msg_received(smi_info->intf, msg);
 207         spin_lock(&(smi_info->si_lock));
 208 }
 209
 210 static void return_hosed_msg(struct smi_info *smi_info)
 211 {
 212         struct ipmi_smi_msg *msg = smi_info->curr_msg;
 213
 214         /* Make it a reponse */
 215         msg->rsp[0] = msg->data[0] | 4;
 216         msg->rsp[1] = msg->data[1];
 217         msg->rsp[2] = 0xFF; /* Unknown error. */
 218         msg->rsp_size = 3;
 219
 220         smi_info->curr_msg = NULL;
 221         deliver_recv_msg(smi_info, msg);
 222 }
 223
 224 static enum si_sm_result start_next_msg(struct smi_info *smi_info)
 225 {
 226         int              rv;
 227         struct list_head *entry = NULL;
 228 #ifdef DEBUG_TIMING
 229         struct timeval t;
 230 #endif
 231
 232         /* No need to save flags, we aleady have interrupts off and we
 233            already hold the SMI lock. */
 234         spin_lock(&(smi_info->msg_lock));
 235
 236         /* Pick the high priority queue first. */
 237         if (! list_empty(&(smi_info->hp_xmit_msgs))) {
 238                 entry = smi_info->hp_xmit_msgs.next;
 239         } else if (! list_empty(&(smi_info->xmit_msgs))) {
 240                 entry = smi_info->xmit_msgs.next;
 241         }
 242
 243         if (!entry) {
 244                 smi_info->curr_msg = NULL;
 245                 rv = SI_SM_IDLE;
 246         } else {
 247                 int err;
 248
 249                 list_del(entry);
 250                 smi_info->curr_msg = list_entry(entry,
 251                                                 struct ipmi_smi_msg,
 252                                                 link);
 253 #ifdef DEBUG_TIMING
 254                 do_gettimeofday(&t);
 255                 printk("**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec);
 256 #endif
 257                 err = smi_info->handlers->start_transaction(
 258                         smi_info->si_sm,
 259                         smi_info->curr_msg->data,
 260                         smi_info->curr_msg->data_size);
 261                 if (err) {
 262                         return_hosed_msg(smi_info);
 263                 }
 264
 265                 rv = SI_SM_CALL_WITHOUT_DELAY;
 266         }
 267         spin_unlock(&(smi_info->msg_lock));
 268
 269         return rv;
 270 }
 271
 272 static void start_enable_irq(struct smi_info *smi_info)
 273 {
 274         unsigned char msg[2];
 275
 276         /* If we are enabling interrupts, we have to tell the
 277            BMC to use them. */
 278         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
 279         msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
 280
 281         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
 282         smi_info->si_state = SI_ENABLE_INTERRUPTS1;
 283 }
 284
 285 static void start_clear_flags(struct smi_info *smi_info)
 286 {
 287         unsigned char msg[3];
 288
 289         /* Make sure the watchdog pre-timeout flag is not set at startup. */
 290         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
 291         msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
 292         msg[2] = WDT_PRE_TIMEOUT_INT;
 293
 294         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
 295         smi_info->si_state = SI_CLEARING_FLAGS;
 296 }
 297
 298 /* When we have a situtaion where we run out of memory and cannot
 299    allocate messages, we just leave them in the BMC and run the system
 300    polled until we can allocate some memory.  Once we have some
 301    memory, we will re-enable the interrupt. */
 302 static inline void disable_si_irq(struct smi_info *smi_info)
 303 {
 304         if ((smi_info->irq) && (!smi_info->interrupt_disabled)) {
 305                 disable_irq_nosync(smi_info->irq);
 306                 smi_info->interrupt_disabled = 1;
 307         }
 308 }
 309
 310 static inline void enable_si_irq(struct smi_info *smi_info)
 311 {
 312         if ((smi_info->irq) && (smi_info->interrupt_disabled)) {
 313                 enable_irq(smi_info->irq);
 314                 smi_info->interrupt_disabled = 0;
 315         }
 316 }
 317
 318 static void handle_flags(struct smi_info *smi_info)
 319 {
 320         if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
 321                 /* Watchdog pre-timeout */
 322                 spin_lock(&smi_info->count_lock);
 323                 smi_info->watchdog_pretimeouts++;
 324                 spin_unlock(&smi_info->count_lock);
 325
 326                 start_clear_flags(smi_info);
 327                 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
 328                 spin_unlock(&(smi_info->si_lock));
 329                 ipmi_smi_watchdog_pretimeout(smi_info->intf);
 330                 spin_lock(&(smi_info->si_lock));
 331         } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) {
 332                 /* Messages available. */
 333                 smi_info->curr_msg = ipmi_alloc_smi_msg();
 334                 if (!smi_info->curr_msg) {
 335                         disable_si_irq(smi_info);
 336                         smi_info->si_state = SI_NORMAL;
 337                         return;
 338                 }
 339                 enable_si_irq(smi_info);
 340
 341                 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
 342                 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD;
 343                 smi_info->curr_msg->data_size = 2;
 344
 345                 smi_info->handlers->start_transaction(
 346                         smi_info->si_sm,
 347                         smi_info->curr_msg->data,
 348                         smi_info->curr_msg->data_size);
 349                 smi_info->si_state = SI_GETTING_MESSAGES;
 350         } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) {
 351                 /* Events available. */
 352                 smi_info->curr_msg = ipmi_alloc_smi_msg();
 353                 if (!smi_info->curr_msg) {
 354                         disable_si_irq(smi_info);
 355                         smi_info->si_state = SI_NORMAL;
 356                         return;
 357                 }
 358                 enable_si_irq(smi_info);
 359
 360                 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
 361                 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
 362                 smi_info->curr_msg->data_size = 2;
 363
 364                 smi_info->handlers->start_transaction(
 365                         smi_info->si_sm,
 366                         smi_info->curr_msg->data,
 367                         smi_info->curr_msg->data_size);
 368                 smi_info->si_state = SI_GETTING_EVENTS;
 369         } else {
 370                 smi_info->si_state = SI_NORMAL;
 371         }
 372 }
 373
 374 static void handle_transaction_done(struct smi_info *smi_info)
 375 {
 376         struct ipmi_smi_msg *msg;
 377 #ifdef DEBUG_TIMING
 378         struct timeval t;
 379
 380         do_gettimeofday(&t);
 381         printk("**Done: %d.%9.9d\n", t.tv_sec, t.tv_usec);
 382 #endif
 383         switch (smi_info->si_state) {
 384         case SI_NORMAL:
 385                 if (!smi_info->curr_msg)
 386                         break;
 387
 388                 smi_info->curr_msg->rsp_size
 389                         = smi_info->handlers->get_result(
 390                                 smi_info->si_sm,
 391                                 smi_info->curr_msg->rsp,
 392                                 IPMI_MAX_MSG_LENGTH);
 393
 394                 /* Do this here becase deliver_recv_msg() releases the
 395                    lock, and a new message can be put in during the
 396                    time the lock is released. */
 397                 msg = smi_info->curr_msg;
 398                 smi_info->curr_msg = NULL;
 399                 deliver_recv_msg(smi_info, msg);
 400                 break;
 401
 402         case SI_GETTING_FLAGS:
 403         {
 404                 unsigned char msg[4];
 405                 unsigned int  len;
 406
 407                 /* We got the flags from the SMI, now handle them. */
 408                 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
 409                 if (msg[2] != 0) {
 410                         /* Error fetching flags, just give up for
 411                            now. */
 412                         smi_info->si_state = SI_NORMAL;
 413                 } else if (len < 4) {
 414                         /* Hmm, no flags.  That's technically illegal, but
 415                            don't use uninitialized data. */
 416                         smi_info->si_state = SI_NORMAL;
 417                 } else {
 418                         smi_info->msg_flags = msg[3];
 419                         handle_flags(smi_info);
 420                 }
 421                 break;
 422         }
 423
 424         case SI_CLEARING_FLAGS:
 425         case SI_CLEARING_FLAGS_THEN_SET_IRQ:
 426         {
 427                 unsigned char msg[3];
 428
 429                 /* We cleared the flags. */
 430                 smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
 431                 if (msg[2] != 0) {
 432                         /* Error clearing flags */
 433                         printk(KERN_WARNING
 434                                "ipmi_si: Error clearing flags: %2.2x\n",
 435                                msg[2]);
 436                 }
 437                 if (smi_info->si_state == SI_CLEARING_FLAGS_THEN_SET_IRQ)
 438                         start_enable_irq(smi_info);
 439                 else
 440                         smi_info->si_state = SI_NORMAL;
 441                 break;
 442         }
 443
 444         case SI_GETTING_EVENTS:
 445         {
 446                 smi_info->curr_msg->rsp_size
 447                         = smi_info->handlers->get_result(
 448                                 smi_info->si_sm,
 449                                 smi_info->curr_msg->rsp,
 450                                 IPMI_MAX_MSG_LENGTH);
 451
 452                 /* Do this here becase deliver_recv_msg() releases the
 453                    lock, and a new message can be put in during the
 454                    time the lock is released. */
 455                 msg = smi_info->curr_msg;
 456                 smi_info->curr_msg = NULL;
 457                 if (msg->rsp[2] != 0) {
 458                         /* Error getting event, probably done. */
 459                         msg->done(msg);
 460
 461                         /* Take off the event flag. */
 462                         smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
 463                         handle_flags(smi_info);
 464                 } else {
 465                         spin_lock(&smi_info->count_lock);
 466                         smi_info->events++;
 467                         spin_unlock(&smi_info->count_lock);
 468
 469                         /* Do this before we deliver the message
 470                            because delivering the message releases the
 471                            lock and something else can mess with the
 472                            state. */
 473                         handle_flags(smi_info);
 474
 475                         deliver_recv_msg(smi_info, msg);
 476                 }
 477                 break;
 478         }
 479
 480         case SI_GETTING_MESSAGES:
 481         {
 482                 smi_info->curr_msg->rsp_size
 483                         = smi_info->handlers->get_result(
 484                                 smi_info->si_sm,
 485                                 smi_info->curr_msg->rsp,
 486                                 IPMI_MAX_MSG_LENGTH);
 487
 488                 /* Do this here becase deliver_recv_msg() releases the
 489                    lock, and a new message can be put in during the
 490                    time the lock is released. */
 491                 msg = smi_info->curr_msg;
 492                 smi_info->curr_msg = NULL;
 493                 if (msg->rsp[2] != 0) {
 494                         /* Error getting event, probably done. */
 495                         msg->done(msg);
 496
 497                         /* Take off the msg flag. */
 498                         smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
 499                         handle_flags(smi_info);
 500                 } else {
 501                         spin_lock(&smi_info->count_lock);
 502                         smi_info->incoming_messages++;
 503                         spin_unlock(&smi_info->count_lock);
 504
 505                         /* Do this before we deliver the message
 506                            because delivering the message releases the
 507                            lock and something else can mess with the
 508                            state. */
 509                         handle_flags(smi_info);
 510
 511                         deliver_recv_msg(smi_info, msg);
 512                 }
 513                 break;
 514         }
 515
 516         case SI_ENABLE_INTERRUPTS1:
 517         {
 518                 unsigned char msg[4];
 519
 520                 /* We got the flags from the SMI, now handle them. */
 521                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
 522                 if (msg[2] != 0) {
 523                         printk(KERN_WARNING
 524                                "ipmi_si: Could not enable interrupts"
 525                                ", failed get, using polled mode.\n");
 526                         smi_info->si_state = SI_NORMAL;
 527                 } else {
 528                         msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
 529                         msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
 530                         msg[2] = msg[3] | 1; /* enable msg queue int */
 531                         smi_info->handlers->start_transaction(
 532                                 smi_info->si_sm, msg, 3);
 533                         smi_info->si_state = SI_ENABLE_INTERRUPTS2;
 534                 }
 535                 break;
 536         }
 537
 538         case SI_ENABLE_INTERRUPTS2:
 539         {
 540                 unsigned char msg[4];
 541
 542                 /* We got the flags from the SMI, now handle them. */
 543                 smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
 544                 if (msg[2] != 0) {
 545                         printk(KERN_WARNING
 546                                "ipmi_si: Could not enable interrupts"
 547                                ", failed set, using polled mode.\n");
 548                 }
 549                 smi_info->si_state = SI_NORMAL;
 550                 break;
 551         }
 552         }
 553 }
 554
 555 /* Called on timeouts and events.  Timeouts should pass the elapsed
 556    time, interrupts should pass in zero. */
 557 static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
 558                                            int time)
 559 {
 560         enum si_sm_result si_sm_result;
 561
 562  restart:
 563         /* There used to be a loop here that waited a little while
 564            (around 25us) before giving up.  That turned out to be
 565            pointless, the minimum delays I was seeing were in the 300us
 566            range, which is far too long to wait in an interrupt.  So
 567            we just run until the state machine tells us something
 568            happened or it needs a delay. */
 569         si_sm_result = smi_info->handlers->event(smi_info->si_sm, time);
 570         time = 0;
 571         while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY)
 572         {
 573                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
 574         }
 575
 576         if (si_sm_result == SI_SM_TRANSACTION_COMPLETE)
 577         {
 578                 spin_lock(&smi_info->count_lock);
 579                 smi_info->complete_transactions++;
 580                 spin_unlock(&smi_info->count_lock);
 581
 582                 handle_transaction_done(smi_info);
 583                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
 584         }
 585         else if (si_sm_result == SI_SM_HOSED)
 586         {
 587                 spin_lock(&smi_info->count_lock);
 588                 smi_info->hosed_count++;
 589                 spin_unlock(&smi_info->count_lock);
 590
 591                 /* Do the before return_hosed_msg, because that
 592                    releases the lock. */
 593                 smi_info->si_state = SI_NORMAL;
 594                 if (smi_info->curr_msg != NULL) {
 595                         /* If we were handling a user message, format
 596                            a response to send to the upper layer to
 597                            tell it about the error. */
 598                         return_hosed_msg(smi_info);
 599                 }
 600                 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0);
 601         }
 602
 603         /* We prefer handling attn over new messages. */
 604         if (si_sm_result == SI_SM_ATTN)
 605         {
 606                 unsigned char msg[2];
 607
 608                 spin_lock(&smi_info->count_lock);
 609                 smi_info->attentions++;
 610                 spin_unlock(&smi_info->count_lock);
 611
 612                 /* Got a attn, send down a get message flags to see
 613                    what's causing it.  It would be better to handle
 614                    this in the upper layer, but due to the way
 615                    interrupts work with the SMI, that's not really
 616                    possible. */
 617                 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
 618                 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
 619
 620                 smi_info->handlers->start_transaction(
 621                         smi_info->si_sm, msg, 2);
 622                 smi_info->si_state = SI_GETTING_FLAGS;
 623                 goto restart;
 624         }
 625
 626         /* If we are currently idle, try to start the next message. */
 627         if (si_sm_result == SI_SM_IDLE) {
 628                 spin_lock(&smi_info->count_lock);
 629                 smi_info->idles++;
 630                 spin_unlock(&smi_info->count_lock);
 631
 632                 si_sm_result = start_next_msg(smi_info);
 633                 if (si_sm_result != SI_SM_IDLE)
 634                         goto restart;
 635         }
 636
 637         if ((si_sm_result == SI_SM_IDLE)
 638             && (atomic_read(&smi_info->req_events)))
 639         {
 640                 /* We are idle and the upper layer requested that I fetch
 641                    events, so do so. */
 642                 unsigned char msg[2];
 643
 644                 spin_lock(&smi_info->count_lock);
 645                 smi_info->flag_fetches++;
 646                 spin_unlock(&smi_info->count_lock);
 647
 648                 atomic_set(&smi_info->req_events, 0);
 649                 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
 650                 msg[1] = IPMI_GET_MSG_FLAGS_CMD;
 651
 652                 smi_info->handlers->start_transaction(
 653                         smi_info->si_sm, msg, 2);
 654                 smi_info->si_state = SI_GETTING_FLAGS;
 655                 goto restart;
 656         }
 657
 658         return si_sm_result;
 659 }
 660
 661 static void sender(void                *send_info,
 662                    struct ipmi_smi_msg *msg,
 663                    int                 priority)
 664 {
 665         struct smi_info   *smi_info = send_info;
 666         enum si_sm_result result;
 667         unsigned long     flags;
 668 #ifdef DEBUG_TIMING
 669         struct timeval    t;
 670 #endif
 671
 672         spin_lock_irqsave(&(smi_info->msg_lock), flags);
 673 #ifdef DEBUG_TIMING
 674         do_gettimeofday(&t);
 675         printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec);
 676 #endif
 677
 678         if (smi_info->run_to_completion) {
 679                 /* If we are running to completion, then throw it in
 680                    the list and run transactions until everything is
 681                    clear.  Priority doesn't matter here. */
 682                 list_add_tail(&(msg->link), &(smi_info->xmit_msgs));
 683
 684                 /* We have to release the msg lock and claim the smi
 685                    lock in this case, because of race conditions. */
 686                 spin_unlock_irqrestore(&(smi_info->msg_lock), flags);
 687
 688                 spin_lock_irqsave(&(smi_info->si_lock), flags);
 689                 result = smi_event_handler(smi_info, 0);
 690                 while (result != SI_SM_IDLE) {
 691                         udelay(SI_SHORT_TIMEOUT_USEC);
 692                         result = smi_event_handler(smi_info,
 693                                                    SI_SHORT_TIMEOUT_USEC);
 694                 }
 695                 spin_unlock_irqrestore(&(smi_info->si_lock), flags);
 696                 return;
 697         } else {
 698                 if (priority > 0) {
 699                         list_add_tail(&(msg->link), &(smi_info->hp_xmit_msgs));
 700                 } else {
 701                         list_add_tail(&(msg->link), &(smi_info->xmit_msgs));
 702                 }
 703         }
 704         spin_unlock_irqrestore(&(smi_info->msg_lock), flags);
 705
 706         spin_lock_irqsave(&(smi_info->si_lock), flags);
 707         if ((smi_info->si_state == SI_NORMAL)
 708             && (smi_info->curr_msg == NULL))
 709         {
 710                 start_next_msg(smi_info);
 711                 si_restart_short_timer(smi_info);
 712         }
 713         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
 714 }
 715
 716 static void set_run_to_completion(void *send_info, int i_run_to_completion)
 717 {
 718         struct smi_info   *smi_info = send_info;
 719         enum si_sm_result result;
 720         unsigned long     flags;
 721
 722         spin_lock_irqsave(&(smi_info->si_lock), flags);
 723
 724         smi_info->run_to_completion = i_run_to_completion;
 725         if (i_run_to_completion) {
 726                 result = smi_event_handler(smi_info, 0);
 727                 while (result != SI_SM_IDLE) {
 728                         udelay(SI_SHORT_TIMEOUT_USEC);
 729                         result = smi_event_handler(smi_info,
 730                                                    SI_SHORT_TIMEOUT_USEC);
 731                 }
 732         }
 733
 734         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
 735 }
 736
 737 static void poll(void *send_info)
 738 {
 739         struct smi_info *smi_info = send_info;
 740
 741         smi_event_handler(smi_info, 0);
 742 }
 743
 744 static void request_events(void *send_info)
 745 {
 746         struct smi_info *smi_info = send_info;
 747
 748         atomic_set(&smi_info->req_events, 1);
 749 }
 750
 751 static int initialized = 0;
 752
 753 /* Must be called with interrupts off and with the si_lock held. */
 754 static void si_restart_short_timer(struct smi_info *smi_info)
 755 {
 756 #if defined(CONFIG_HIGH_RES_TIMERS)
 757         unsigned long flags;
 758         unsigned long jiffies_now;
 759
 760         if (del_timer(&(smi_info->si_timer))) {
 761                 /* If we don't delete the timer, then it will go off
 762                    immediately, anyway.  So we only process if we
 763                    actually delete the timer. */
 764
 765                 /* We already have irqsave on, so no need for it
 766                    here. */
 767                 read_lock(&xtime_lock);
 768                 jiffies_now = jiffies;
 769                 smi_info->si_timer.expires = jiffies_now;
 770                 smi_info->si_timer.sub_expires = get_arch_cycles(jiffies_now);
 771
 772                 add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC);
 773
 774                 add_timer(&(smi_info->si_timer));
 775                 spin_lock_irqsave(&smi_info->count_lock, flags);
 776                 smi_info->timeout_restarts++;
 777                 spin_unlock_irqrestore(&smi_info->count_lock, flags);
 778         }
 779 #endif
 780 }
 781
 782 static void smi_timeout(unsigned long data)
 783 {
 784         struct smi_info   *smi_info = (struct smi_info *) data;
 785         enum si_sm_result smi_result;
 786         unsigned long     flags;
 787         unsigned long     jiffies_now;
 788         unsigned long     time_diff;
 789 #ifdef DEBUG_TIMING
 790         struct timeval    t;
 791 #endif
 792
 793         if (smi_info->stop_operation) {
 794                 smi_info->timer_stopped = 1;
 795                 return;
 796         }
 797
 798         spin_lock_irqsave(&(smi_info->si_lock), flags);
 799 #ifdef DEBUG_TIMING
 800         do_gettimeofday(&t);
 801         printk("**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec);
 802 #endif
 803         jiffies_now = jiffies;
 804         time_diff = ((jiffies_now - smi_info->last_timeout_jiffies)
 805                      * SI_USEC_PER_JIFFY);
 806         smi_result = smi_event_handler(smi_info, time_diff);
 807
 808         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
 809
 810         smi_info->last_timeout_jiffies = jiffies_now;
 811
 812         if ((smi_info->irq) && (! smi_info->interrupt_disabled)) {
 813                 /* Running with interrupts, only do long timeouts. */
 814                 smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
 815                 spin_lock_irqsave(&smi_info->count_lock, flags);
 816                 smi_info->long_timeouts++;
 817                 spin_unlock_irqrestore(&smi_info->count_lock, flags);
 818                 goto do_add_timer;
 819         }
 820
 821         /* If the state machine asks for a short delay, then shorten
 822            the timer timeout. */
 823         if (smi_result == SI_SM_CALL_WITH_DELAY) {
 824                 spin_lock_irqsave(&smi_info->count_lock, flags);
 825                 smi_info->short_timeouts++;
 826                 spin_unlock_irqrestore(&smi_info->count_lock, flags);
 827 #if defined(CONFIG_HIGH_RES_TIMERS)
 828                 read_lock(&xtime_lock);
 829                 smi_info->si_timer.expires = jiffies;
 830                 smi_info->si_timer.sub_expires
 831                         = get_arch_cycles(smi_info->si_timer.expires);
 832                 read_unlock(&xtime_lock);
 833                 add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC);
 834 #else
 835                 smi_info->si_timer.expires = jiffies + 1;
 836 #endif
 837         } else {
 838                 spin_lock_irqsave(&smi_info->count_lock, flags);
 839                 smi_info->long_timeouts++;
 840                 spin_unlock_irqrestore(&smi_info->count_lock, flags);
 841                 smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
 842 #if defined(CONFIG_HIGH_RES_TIMERS)
 843                 smi_info->si_timer.sub_expires = 0;
 844 #endif
 845         }
 846
 847  do_add_timer:
 848         add_timer(&(smi_info->si_timer));
 849 }
 850
 851 static irqreturn_t si_irq_handler(int irq, void *data, struct pt_regs *regs)
 852 {
 853         struct smi_info *smi_info = data;
 854         unsigned long   flags;
 855 #ifdef DEBUG_TIMING
 856         struct timeval  t;
 857 #endif
 858
 859         spin_lock_irqsave(&(smi_info->si_lock), flags);
 860
 861         spin_lock(&smi_info->count_lock);
 862         smi_info->interrupts++;
 863         spin_unlock(&smi_info->count_lock);
 864
 865         if (smi_info->stop_operation)
 866                 goto out;
 867
 868 #ifdef DEBUG_TIMING
 869         do_gettimeofday(&t);
 870         printk("**Interrupt: %d.%9.9d\n", t.tv_sec, t.tv_usec);
 871 #endif
 872         smi_event_handler(smi_info, 0);
 873  out:
 874         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
 875         return IRQ_HANDLED;
 876 }
 877
 878 static struct ipmi_smi_handlers handlers =
 879 {
 880         .owner                  = THIS_MODULE,
 881         .sender                 = sender,
 882         .request_events         = request_events,
 883         .set_run_to_completion  = set_run_to_completion,
 884         .poll                   = poll,
 885 };
 886
 887 /* There can be 4 IO ports passed in (with or without IRQs), 4 addresses,
 888    a default IO port, and 1 ACPI/SPMI address.  That sets SI_MAX_DRIVERS */
 889
 890 #define SI_MAX_PARMS 4
 891 #define SI_MAX_DRIVERS ((SI_MAX_PARMS * 2) + 2)
 892 static struct smi_info *smi_infos[SI_MAX_DRIVERS] =
 893 { NULL, NULL, NULL, NULL };
 894
 895 #define DEVICE_NAME "ipmi_si"
 896
 897 #define DEFAULT_KCS_IO_PORT     0xca2
 898 #define DEFAULT_SMIC_IO_PORT    0xca9
 899 #define DEFAULT_BT_IO_PORT      0xe4
 900 #define DEFAULT_REGSPACING      1
 901
 902 static int           si_trydefaults = 1;
 903 static char          *si_type[SI_MAX_PARMS];
 904 #define MAX_SI_TYPE_STR 30
 905 static char          si_type_str[MAX_SI_TYPE_STR];
 906 static unsigned long addrs[SI_MAX_PARMS];
 907 static int num_addrs;
 908 static unsigned int  ports[SI_MAX_PARMS];
 909 static int num_ports;
 910 static int           irqs[SI_MAX_PARMS];
 911 static int num_irqs;
 912 static int           regspacings[SI_MAX_PARMS];
 913 static int num_regspacings = 0;
 914 static int           regsizes[SI_MAX_PARMS];
 915 static int num_regsizes = 0;
 916 static int           regshifts[SI_MAX_PARMS];
 917 static int num_regshifts = 0;
 918 static int slave_addrs[SI_MAX_PARMS];
 919 static int num_slave_addrs = 0;
 920
 921
 922 module_param_named(trydefaults, si_trydefaults, bool, 0);
 923 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the"
 924                  " default scan of the KCS and SMIC interface at the standard"
 925                  " address");
 926 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0);
 927 MODULE_PARM_DESC(type, "Defines the type of each interface, each"
 928                  " interface separated by commas.  The types are 'kcs',"
 929                  " 'smic', and 'bt'.  For example si_type=kcs,bt will set"
 930                  " the first interface to kcs and the second to bt");
 931 module_param_array(addrs, long, &num_addrs, 0);
 932 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the"
 933                  " addresses separated by commas.  Only use if an interface"
 934                  " is in memory.  Otherwise, set it to zero or leave"
 935                  " it blank.");
 936 module_param_array(ports, int, &num_ports, 0);
 937 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the"
 938                  " addresses separated by commas.  Only use if an interface"
 939                  " is a port.  Otherwise, set it to zero or leave"
 940                  " it blank.");
 941 module_param_array(irqs, int, &num_irqs, 0);
 942 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the"
 943                  " addresses separated by commas.  Only use if an interface"
 944                  " has an interrupt.  Otherwise, set it to zero or leave"
 945                  " it blank.");
 946 module_param_array(regspacings, int, &num_regspacings, 0);
 947 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address"
 948                  " and each successive register used by the interface.  For"
 949                  " instance, if the start address is 0xca2 and the spacing"
 950                  " is 2, then the second address is at 0xca4.  Defaults"
 951                  " to 1.");
 952 module_param_array(regsizes, int, &num_regsizes, 0);
 953 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes."
 954                  " This should generally be 1, 2, 4, or 8 for an 8-bit,"
 955                  " 16-bit, 32-bit, or 64-bit register.  Use this if you"
 956                  " the 8-bit IPMI register has to be read from a larger"
 957                  " register.");
 958 module_param_array(regshifts, int, &num_regshifts, 0);
 959 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the."
 960                  " IPMI register, in bits.  For instance, if the data"
 961                  " is read from a 32-bit word and the IPMI data is in"
 962                  " bit 8-15, then the shift would be 8");
 963 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
 964 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for"
 965                  " the controller.  Normally this is 0x20, but can be"
 966                  " overridden by this parm.  This is an array indexed"
 967                  " by interface number.");
 968
 969
 970 #define IPMI_MEM_ADDR_SPACE 1
 971 #define IPMI_IO_ADDR_SPACE  2
 972
 973 #if defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_X86) || defined(CONFIG_PCI)
 974 static int is_new_interface(int intf, u8 addr_space, unsigned long base_addr)
 975 {
 976         int i;
 977
 978         for (i = 0; i < SI_MAX_PARMS; ++i) {
 979                 /* Don't check our address. */
 980                 if (i == intf)
 981                         continue;
 982                 if (si_type[i] != NULL) {
 983                         if ((addr_space == IPMI_MEM_ADDR_SPACE &&
 984                              base_addr == addrs[i]) ||
 985                             (addr_space == IPMI_IO_ADDR_SPACE &&
 986                              base_addr == ports[i]))
 987                                 return 0;
 988                 }
 989                 else
 990                         break;
 991         }
 992
 993         return 1;
 994 }
 995 #endif
 996
 997 static int std_irq_setup(struct smi_info *info)
 998 {
 999         int rv;
1000
1001         if (!info->irq)
1002                 return 0;
1003
1004         rv = request_irq(info->irq,
1005                          si_irq_handler,
1006                          SA_INTERRUPT,
1007                          DEVICE_NAME,
1008                          info);
1009         if (rv) {
1010                 printk(KERN_WARNING
1011                        "ipmi_si: %s unable to claim interrupt %d,"
1012                        " running polled\n",
1013                        DEVICE_NAME, info->irq);
1014                 info->irq = 0;
1015         } else {
1016                 printk("  Using irq %d\n", info->irq);
1017         }
1018
1019         return rv;
1020 }
1021
1022 static void std_irq_cleanup(struct smi_info *info)
1023 {
1024         if (!info->irq)
1025                 return;
1026
1027         free_irq(info->irq, info);
1028 }
1029
1030 static unsigned char port_inb(struct si_sm_io *io, unsigned int offset)
1031 {
1032         unsigned int *addr = io->info;
1033
1034         return inb((*addr)+(offset*io->regspacing));
1035 }
1036
1037 static void port_outb(struct si_sm_io *io, unsigned int offset,
1038                       unsigned char b)
1039 {
1040         unsigned int *addr = io->info;
1041
1042         outb(b, (*addr)+(offset * io->regspacing));
1043 }
1044
1045 static unsigned char port_inw(struct si_sm_io *io, unsigned int offset)
1046 {
1047         unsigned int *addr = io->info;
1048
1049         return (inw((*addr)+(offset * io->regspacing)) >> io->regshift) & 0xff;
1050 }
1051
1052 static void port_outw(struct si_sm_io *io, unsigned int offset,
1053                       unsigned char b)
1054 {
1055         unsigned int *addr = io->info;
1056
1057         outw(b << io->regshift, (*addr)+(offset * io->regspacing));
1058 }
1059
1060 static unsigned char port_inl(struct si_sm_io *io, unsigned int offset)
1061 {
1062         unsigned int *addr = io->info;
1063
1064         return (inl((*addr)+(offset * io->regspacing)) >> io->regshift) & 0xff;
1065 }
1066
1067 static void port_outl(struct si_sm_io *io, unsigned int offset,
1068                       unsigned char b)
1069 {
1070         unsigned int *addr = io->info;
1071
1072         outl(b << io->regshift, (*addr)+(offset * io->regspacing));
1073 }
1074
1075 static void port_cleanup(struct smi_info *info)
1076 {
1077         unsigned int *addr = info->io.info;
1078         int           mapsize;
1079
1080         if (addr && (*addr)) {
1081                 mapsize = ((info->io_size * info->io.regspacing)
1082                            - (info->io.regspacing - info->io.regsize));
1083
1084                 release_region (*addr, mapsize);
1085         }
1086         kfree(info);
1087 }
1088
1089 static int port_setup(struct smi_info *info)
1090 {
1091         unsigned int *addr = info->io.info;
1092         int           mapsize;
1093
1094         if (!addr || (!*addr))
1095                 return -ENODEV;
1096
1097         info->io_cleanup = port_cleanup;
1098
1099         /* Figure out the actual inb/inw/inl/etc routine to use based
1100            upon the register size. */
1101         switch (info->io.regsize) {
1102         case 1:
1103                 info->io.inputb = port_inb;
1104                 info->io.outputb = port_outb;
1105                 break;
1106         case 2:
1107                 info->io.inputb = port_inw;
1108                 info->io.outputb = port_outw;
1109                 break;
1110         case 4:
1111                 info->io.inputb = port_inl;
1112                 info->io.outputb = port_outl;
1113                 break;
1114         default:
1115                 printk("ipmi_si: Invalid register size: %d\n",
1116                        info->io.regsize);
1117                 return -EINVAL;
1118         }
1119
1120         /* Calculate the total amount of memory to claim.  This is an
1121          * unusual looking calculation, but it avoids claiming any
1122          * more memory than it has to.  It will claim everything
1123          * between the first address to the end of the last full
1124          * register. */
1125         mapsize = ((info->io_size * info->io.regspacing)
1126                    - (info->io.regspacing - info->io.regsize));
1127
1128         if (request_region(*addr, mapsize, DEVICE_NAME) == NULL)
1129                 return -EIO;
1130         return 0;
1131 }
1132
1133 static int try_init_port(int intf_num, struct smi_info **new_info)
1134 {
1135         struct smi_info *info;
1136
1137         if (!ports[intf_num])
1138                 return -ENODEV;
1139
1140         if (!is_new_interface(intf_num, IPMI_IO_ADDR_SPACE,
1141                               ports[intf_num]))
1142                 return -ENODEV;
1143
1144         info = kmalloc(sizeof(*info), GFP_KERNEL);
1145         if (!info) {
1146                 printk(KERN_ERR "ipmi_si: Could not allocate SI data (1)\n");
1147                 return -ENOMEM;
1148         }
1149         memset(info, 0, sizeof(*info));
1150
1151         info->io_setup = port_setup;
1152         info->io.info = &(ports[intf_num]);
1153         info->io.addr = NULL;
1154         info->io.regspacing = regspacings[intf_num];
1155         if (!info->io.regspacing)
1156                 info->io.regspacing = DEFAULT_REGSPACING;
1157         info->io.regsize = regsizes[intf_num];
1158         if (!info->io.regsize)
1159                 info->io.regsize = DEFAULT_REGSPACING;
1160         info->io.regshift = regshifts[intf_num];
1161         info->irq = 0;
1162         info->irq_setup = NULL;
1163         *new_info = info;
1164
1165         if (si_type[intf_num] == NULL)
1166                 si_type[intf_num] = "kcs";
1167
1168         printk("ipmi_si: Trying \"%s\" at I/O port 0x%x\n",
1169                si_type[intf_num], ports[intf_num]);
1170         return 0;
1171 }
1172
1173 static unsigned char mem_inb(struct si_sm_io *io, unsigned int offset)
1174 {
1175         return readb((io->addr)+(offset * io->regspacing));
1176 }
1177
1178 static void mem_outb(struct si_sm_io *io, unsigned int offset,
1179                      unsigned char b)
1180 {
1181         writeb(b, (io->addr)+(offset * io->regspacing));
1182 }
1183
1184 static unsigned char mem_inw(struct si_sm_io *io, unsigned int offset)
1185 {
1186         return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift)
1187                 && 0xff;
1188 }
1189
1190 static void mem_outw(struct si_sm_io *io, unsigned int offset,
1191                      unsigned char b)
1192 {
1193         writeb(b << io->regshift, (io->addr)+(offset * io->regspacing));
1194 }
1195
1196 static unsigned char mem_inl(struct si_sm_io *io, unsigned int offset)
1197 {
1198         return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift)
1199                 && 0xff;
1200 }
1201
1202 static void mem_outl(struct si_sm_io *io, unsigned int offset,
1203                      unsigned char b)
1204 {
1205         writel(b << io->regshift, (io->addr)+(offset * io->regspacing));
1206 }
1207
1208 #ifdef readq
1209 static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset)
1210 {
1211         return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift)
1212                 && 0xff;
1213 }
1214
1215 static void mem_outq(struct si_sm_io *io, unsigned int offset,
1216                      unsigned char b)
1217 {
1218         writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
1219 }
1220 #endif
1221
1222 static void mem_cleanup(struct smi_info *info)
1223 {
1224         unsigned long *addr = info->io.info;
1225         int           mapsize;
1226
1227         if (info->io.addr) {
1228                 iounmap(info->io.addr);
1229
1230                 mapsize = ((info->io_size * info->io.regspacing)
1231                            - (info->io.regspacing - info->io.regsize));
1232
1233                 release_mem_region(*addr, mapsize);
1234         }
1235         kfree(info);
1236 }
1237
1238 static int mem_setup(struct smi_info *info)
1239 {
1240         unsigned long *addr = info->io.info;
1241         int           mapsize;
1242
1243         if (!addr || (!*addr))
1244                 return -ENODEV;
1245
1246         info->io_cleanup = mem_cleanup;
1247
1248         /* Figure out the actual readb/readw/readl/etc routine to use based
1249            upon the register size. */
1250         switch (info->io.regsize) {
1251         case 1:
1252                 info->io.inputb = mem_inb;
1253                 info->io.outputb = mem_outb;
1254                 break;
1255         case 2:
1256                 info->io.inputb = mem_inw;
1257                 info->io.outputb = mem_outw;
1258                 break;
1259         case 4:
1260                 info->io.inputb = mem_inl;
1261                 info->io.outputb = mem_outl;
1262                 break;
1263 #ifdef readq
1264         case 8:
1265                 info->io.inputb = mem_inq;
1266                 info->io.outputb = mem_outq;
1267                 break;
1268 #endif
1269         default:
1270                 printk("ipmi_si: Invalid register size: %d\n",
1271                        info->io.regsize);
1272                 return -EINVAL;
1273         }
1274
1275         /* Calculate the total amount of memory to claim.  This is an
1276          * unusual looking calculation, but it avoids claiming any
1277          * more memory than it has to.  It will claim everything
1278          * between the first address to the end of the last full
1279          * register. */
1280         mapsize = ((info->io_size * info->io.regspacing)
1281                    - (info->io.regspacing - info->io.regsize));
1282
1283         if (request_mem_region(*addr, mapsize, DEVICE_NAME) == NULL)
1284                 return -EIO;
1285
1286         info->io.addr = ioremap(*addr, mapsize);
1287         if (info->io.addr == NULL) {
1288                 release_mem_region(*addr, mapsize);
1289                 return -EIO;
1290         }
1291         return 0;
1292 }
1293
1294 static int try_init_mem(int intf_num, struct smi_info **new_info)
1295 {
1296         struct smi_info *info;
1297
1298         if (!addrs[intf_num])
1299                 return -ENODEV;
1300
1301         if (!is_new_interface(intf_num, IPMI_MEM_ADDR_SPACE,
1302                               addrs[intf_num]))
1303                 return -ENODEV;
1304
1305         info = kmalloc(sizeof(*info), GFP_KERNEL);
1306         if (!info) {
1307                 printk(KERN_ERR "ipmi_si: Could not allocate SI data (2)\n");
1308                 return -ENOMEM;
1309         }
1310         memset(info, 0, sizeof(*info));
1311
1312         info->io_setup = mem_setup;
1313         info->io.info = &addrs[intf_num];
1314         info->io.addr = NULL;
1315         info->io.regspacing = regspacings[intf_num];
1316         if (!info->io.regspacing)
1317                 info->io.regspacing = DEFAULT_REGSPACING;
1318         info->io.regsize = regsizes[intf_num];
1319         if (!info->io.regsize)
1320                 info->io.regsize = DEFAULT_REGSPACING;
1321         info->io.regshift = regshifts[intf_num];
1322         info->irq = 0;
1323         info->irq_setup = NULL;
1324         *new_info = info;
1325
1326         if (si_type[intf_num] == NULL)
1327                 si_type[intf_num] = "kcs";
1328
1329         printk("ipmi_si: Trying \"%s\" at memory address 0x%lx\n",
1330                si_type[intf_num], addrs[intf_num]);
1331         return 0;
1332 }
1333
1334
1335 #ifdef CONFIG_ACPI_INTERPRETER
1336
1337 #include <linux/acpi.h>
1338
1339 /* Once we get an ACPI failure, we don't try any more, because we go
1340    through the tables sequentially.  Once we don't find a table, there
1341    are no more. */
1342 static int acpi_failure = 0;
1343
1344 /* For GPE-type interrupts. */
1345 static u32 ipmi_acpi_gpe(void *context)
1346 {
1347         struct smi_info *smi_info = context;
1348         unsigned long   flags;
1349 #ifdef DEBUG_TIMING
1350         struct timeval t;
1351 #endif
1352
1353         spin_lock_irqsave(&(smi_info->si_lock), flags);
1354
1355         spin_lock(&smi_info->count_lock);
1356         smi_info->interrupts++;
1357         spin_unlock(&smi_info->count_lock);
1358
1359         if (smi_info->stop_operation)
1360                 goto out;
1361
1362 #ifdef DEBUG_TIMING
1363         do_gettimeofday(&t);
1364         printk("**ACPI_GPE: %d.%9.9d\n", t.tv_sec, t.tv_usec);
1365 #endif
1366         smi_event_handler(smi_info, 0);
1367  out:
1368         spin_unlock_irqrestore(&(smi_info->si_lock), flags);
1369
1370         return ACPI_INTERRUPT_HANDLED;
1371 }
1372
1373 static int acpi_gpe_irq_setup(struct smi_info *info)
1374 {
1375         acpi_status status;
1376
1377         if (!info->irq)
1378                 return 0;
1379
1380         /* FIXME - is level triggered right? */
1381         status = acpi_install_gpe_handler(NULL,
1382                                           info->irq,
1383                                           ACPI_GPE_LEVEL_TRIGGERED,
1384                                           &ipmi_acpi_gpe,
1385                                           info);
1386         if (status != AE_OK) {
1387                 printk(KERN_WARNING
1388                        "ipmi_si: %s unable to claim ACPI GPE %d,"
1389                        " running polled\n",
1390                        DEVICE_NAME, info->irq);
1391                 info->irq = 0;
1392                 return -EINVAL;
1393         } else {
1394                 printk("  Using ACPI GPE %d\n", info->irq);
1395                 return 0;
1396         }
1397 }
1398
1399 static void acpi_gpe_irq_cleanup(struct smi_info *info)
1400 {
1401         if (!info->irq)
1402                 return;
1403
1404         acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe);
1405 }
1406
1407 /*
1408  * Defined at
1409  * http://h21007.www2.hp.com/dspp/files/unprotected/devresource/Docs/TechPapers/IA64/hpspmi.pdf
1410  */
1411 struct SPMITable {
1412         s8      Signature[4];
1413         u32     Length;
1414         u8      Revision;
1415         u8      Checksum;
1416         s8      OEMID[6];
1417         s8      OEMTableID[8];
1418         s8      OEMRevision[4];
1419         s8      CreatorID[4];
1420         s8      CreatorRevision[4];
1421         u8      InterfaceType;
1422         u8      IPMIlegacy;
1423         s16     SpecificationRevision;
1424
1425         /*
1426          * Bit 0 - SCI interrupt supported
1427          * Bit 1 - I/O APIC/SAPIC
1428          */
1429         u8      InterruptType;
1430
1431         /* If bit 0 of InterruptType is set, then this is the SCI
1432            interrupt in the GPEx_STS register. */
1433         u8      GPE;
1434
1435         s16     Reserved;
1436
1437         /* If bit 1 of InterruptType is set, then this is the I/O
1438            APIC/SAPIC interrupt. */
1439         u32     GlobalSystemInterrupt;
1440
1441         /* The actual register address. */
1442         struct acpi_generic_address addr;
1443
1444         u8      UID[4];
1445
1446         s8      spmi_id[1]; /* A '\0' terminated array starts here. */
1447 };
1448
1449 static int try_init_acpi(int intf_num, struct smi_info **new_info)
1450 {
1451         struct smi_info  *info;
1452         acpi_status      status;
1453         struct SPMITable *spmi;
1454         char             *io_type;
1455         u8               addr_space;
1456
1457         if (acpi_failure)
1458                 return -ENODEV;
1459
1460         status = acpi_get_firmware_table("SPMI", intf_num+1,
1461                                          ACPI_LOGICAL_ADDRESSING,
1462                                          (struct acpi_table_header **) &spmi);
1463         if (status != AE_OK) {
1464                 acpi_failure = 1;
1465                 return -ENODEV;
1466         }
1467
1468         if (spmi->IPMIlegacy != 1) {
1469             printk(KERN_INFO "IPMI: Bad SPMI legacy %d\n", spmi->IPMIlegacy);
1470             return -ENODEV;
1471         }
1472
1473         if (spmi->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
1474                 addr_space = IPMI_MEM_ADDR_SPACE;
1475         else
1476                 addr_space = IPMI_IO_ADDR_SPACE;
1477         if (!is_new_interface(-1, addr_space, spmi->addr.address))
1478                 return -ENODEV;
1479
1480         if (!spmi->addr.register_bit_width) {
1481                 acpi_failure = 1;
1482                 return -ENODEV;
1483         }
1484
1485         /* Figure out the interface type. */
1486         switch (spmi->InterfaceType)
1487         {
1488         case 1: /* KCS */
1489                 si_type[intf_num] = "kcs";
1490                 break;
1491
1492         case 2: /* SMIC */
1493                 si_type[intf_num] = "smic";
1494                 break;
1495
1496         case 3: /* BT */
1497                 si_type[intf_num] = "bt";
1498                 break;
1499
1500         default:
1501                 printk(KERN_INFO "ipmi_si: Unknown ACPI/SPMI SI type %d\n",
1502                         spmi->InterfaceType);
1503                 return -EIO;
1504         }
1505
1506         info = kmalloc(sizeof(*info), GFP_KERNEL);
1507         if (!info) {
1508                 printk(KERN_ERR "ipmi_si: Could not allocate SI data (3)\n");
1509                 return -ENOMEM;
1510         }
1511         memset(info, 0, sizeof(*info));
1512
1513         if (spmi->InterruptType & 1) {
1514                 /* We've got a GPE interrupt. */
1515                 info->irq = spmi->GPE;
1516                 info->irq_setup = acpi_gpe_irq_setup;
1517                 info->irq_cleanup = acpi_gpe_irq_cleanup;
1518         } else if (spmi->InterruptType & 2) {
1519                 /* We've got an APIC/SAPIC interrupt. */
1520                 info->irq = spmi->GlobalSystemInterrupt;
1521                 info->irq_setup = std_irq_setup;
1522                 info->irq_cleanup = std_irq_cleanup;
1523         } else {
1524                 /* Use the default interrupt setting. */
1525                 info->irq = 0;
1526                 info->irq_setup = NULL;
1527         }
1528
1529         regspacings[intf_num] = spmi->addr.register_bit_width / 8;
1530         info->io.regspacing = spmi->addr.register_bit_width / 8;
1531         regsizes[intf_num] = regspacings[intf_num];
1532         info->io.regsize = regsizes[intf_num];
1533         regshifts[intf_num] = spmi->addr.register_bit_offset;
1534         info->io.regshift = regshifts[intf_num];
1535
1536         if (spmi->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
1537                 io_type = "memory";
1538                 info->io_setup = mem_setup;
1539                 addrs[intf_num] = spmi->addr.address;
1540                 info->io.info = &(addrs[intf_num]);
1541         } else if (spmi->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
1542                 io_type = "I/O";
1543                 info->io_setup = port_setup;
1544                 ports[intf_num] = spmi->addr.address;
1545                 info->io.info = &(ports[intf_num]);
1546         } else {
1547                 kfree(info);
1548                 printk("ipmi_si: Unknown ACPI I/O Address type\n");
1549                 return -EIO;
1550         }
1551
1552         *new_info = info;
1553
1554         printk("ipmi_si: ACPI/SPMI specifies \"%s\" %s SI @ 0x%lx\n",
1555                si_type[intf_num], io_type, (unsigned long) spmi->addr.address);
1556         return 0;
1557 }
1558 #endif
1559
1560 #ifdef CONFIG_X86
1561 typedef struct dmi_ipmi_data
1562 {
1563         u8              type;
1564         u8              addr_space;
1565         unsigned long   base_addr;
1566         u8              irq;
1567         u8              offset;
1568         u8              slave_addr;
1569 } dmi_ipmi_data_t;
1570
1571 static dmi_ipmi_data_t dmi_data[SI_MAX_DRIVERS];
1572 static int dmi_data_entries;
1573
1574 typedef struct dmi_header
1575 {
1576         u8      type;
1577         u8      length;
1578         u16     handle;
1579 } dmi_header_t;
1580
1581 static int decode_dmi(dmi_header_t *dm, int intf_num)
1582 {
1583         u8              *data = (u8 *)dm;
1584         unsigned long   base_addr;
1585         u8              reg_spacing;
1586         u8              len = dm->length;
1587         dmi_ipmi_data_t *ipmi_data = dmi_data+intf_num;
1588
1589         ipmi_data->type = data[4];
1590
1591         memcpy(&base_addr, data+8, sizeof(unsigned long));
1592         if (len >= 0x11) {
1593                 if (base_addr & 1) {
1594                         /* I/O */
1595                         base_addr &= 0xFFFE;
1596                         ipmi_data->addr_space = IPMI_IO_ADDR_SPACE;
1597                 }
1598                 else {
1599                         /* Memory */
1600                         ipmi_data->addr_space = IPMI_MEM_ADDR_SPACE;
1601                 }
1602                 /* If bit 4 of byte 0x10 is set, then the lsb for the address
1603                    is odd. */
1604                 ipmi_data->base_addr = base_addr | ((data[0x10] & 0x10) >> 4);
1605
1606                 ipmi_data->irq = data[0x11];
1607
1608                 /* The top two bits of byte 0x10 hold the register spacing. */
1609                 reg_spacing = (data[0x10] & 0xC0) >> 6;
1610                 switch(reg_spacing){
1611                 case 0x00: /* Byte boundaries */
1612                     ipmi_data->offset = 1;
1613                     break;
1614                 case 0x01: /* 32-bit boundaries */
1615                     ipmi_data->offset = 4;
1616                     break;
1617                 case 0x02: /* 16-byte boundaries */
1618                     ipmi_data->offset = 16;
1619                     break;
1620                 default:
1621                     /* Some other interface, just ignore it. */
1622                     return -EIO;
1623                 }
1624         } else {
1625                 /* Old DMI spec. */
1626                 ipmi_data->base_addr = base_addr;
1627                 ipmi_data->addr_space = IPMI_IO_ADDR_SPACE;
1628                 ipmi_data->offset = 1;
1629         }
1630
1631         ipmi_data->slave_addr = data[6];
1632
1633         if (is_new_interface(-1, ipmi_data->addr_space,ipmi_data->base_addr)) {
1634                 dmi_data_entries++;
1635                 return 0;
1636         }
1637
1638         memset(ipmi_data, 0, sizeof(dmi_ipmi_data_t));
1639
1640         return -1;
1641 }
1642
1643 static int dmi_table(u32 base, int len, int num)
1644 {
1645         u8                *buf;
1646         struct dmi_header *dm;
1647         u8                *data;
1648         int               i=1;
1649         int               status=-1;
1650         int               intf_num = 0;
1651
1652         buf = ioremap(base, len);
1653         if(buf==NULL)
1654                 return -1;
1655
1656         data = buf;
1657
1658         while(i<num && (data - buf) < len)
1659         {
1660                 dm=(dmi_header_t *)data;
1661
1662                 if((data-buf+dm->length) >= len)
1663                         break;
1664
1665                 if (dm->type == 38) {
1666                         if (decode_dmi(dm, intf_num) == 0) {
1667                                 intf_num++;
1668                                 if (intf_num >= SI_MAX_DRIVERS)
1669                                         break;
1670                         }
1671                 }
1672
1673                 data+=dm->length;
1674                 while((data-buf) < len && (*data || data[1]))
1675                         data++;
1676                 data+=2;
1677                 i++;
1678         }
1679         iounmap(buf);
1680
1681         return status;
1682 }
1683
1684 inline static int dmi_checksum(u8 *buf)
1685 {
1686         u8   sum=0;
1687         int  a;
1688
1689         for(a=0; a<15; a++)
1690                 sum+=buf[a];
1691         return (sum==0);
1692 }
1693
1694 static int dmi_decode(void)
1695 {
1696         u8   buf[15];
1697         u32  fp=0xF0000;
1698
1699 #ifdef CONFIG_SIMNOW
1700         return -1;
1701 #endif
1702
1703         while(fp < 0xFFFFF)
1704         {
1705                 isa_memcpy_fromio(buf, fp, 15);
1706                 if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf))
1707                 {
1708                         u16 num=buf[13]<<8|buf[12];
1709                         u16 len=buf[7]<<8|buf[6];
1710                         u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];
1711
1712                         if(dmi_table(base, len, num) == 0)
1713                                 return 0;
1714                 }
1715                 fp+=16;
1716         }
1717
1718         return -1;
1719 }
1720
1721 static int try_init_smbios(int intf_num, struct smi_info **new_info)
1722 {
1723         struct smi_info   *info;
1724         dmi_ipmi_data_t   *ipmi_data = dmi_data+intf_num;
1725         char              *io_type;
1726
1727         if (intf_num >= dmi_data_entries)
1728                 return -ENODEV;
1729
1730         switch(ipmi_data->type) {
1731                 case 0x01: /* KCS */
1732                         si_type[intf_num] = "kcs";
1733                         break;
1734                 case 0x02: /* SMIC */
1735                         si_type[intf_num] = "smic";
1736                         break;
1737                 case 0x03: /* BT */
1738                         si_type[intf_num] = "bt";
1739                         break;
1740                 default:
1741                         return -EIO;
1742         }
1743
1744         info = kmalloc(sizeof(*info), GFP_KERNEL);
1745         if (!info) {
1746                 printk(KERN_ERR "ipmi_si: Could not allocate SI data (4)\n");
1747                 return -ENOMEM;
1748         }
1749         memset(info, 0, sizeof(*info));
1750
1751         if (ipmi_data->addr_space == 1) {
1752                 io_type = "memory";
1753                 info->io_setup = mem_setup;
1754                 addrs[intf_num] = ipmi_data->base_addr;
1755                 info->io.info = &(addrs[intf_num]);
1756         } else if (ipmi_data->addr_space == 2) {
1757                 io_type = "I/O";
1758                 info->io_setup = port_setup;
1759                 ports[intf_num] = ipmi_data->base_addr;
1760                 info->io.info = &(ports[intf_num]);
1761         } else {
1762                 kfree(info);
1763                 printk("ipmi_si: Unknown SMBIOS I/O Address type.\n");
1764                 return -EIO;
1765         }
1766
1767         regspacings[intf_num] = ipmi_data->offset;
1768         info->io.regspacing = regspacings[intf_num];
1769         if (!info->io.regspacing)
1770                 info->io.regspacing = DEFAULT_REGSPACING;
1771         info->io.regsize = DEFAULT_REGSPACING;
1772         info->io.regshift = regshifts[intf_num];
1773
1774         info->slave_addr = ipmi_data->slave_addr;
1775
1776         irqs[intf_num] = ipmi_data->irq;
1777
1778         *new_info = info;
1779
1780         printk("ipmi_si: Found SMBIOS-specified state machine at %s"
1781                " address 0x%lx, slave address 0x%x\n",
1782                io_type, (unsigned long)ipmi_data->base_addr,
1783                ipmi_data->slave_addr);
1784         return 0;
1785 }
1786 #endif /* CONFIG_X86 */
1787
1788 #ifdef CONFIG_PCI
1789
1790 #define PCI_ERMC_CLASSCODE  0x0C0700
1791 #define PCI_HP_VENDOR_ID    0x103C
1792 #define PCI_MMC_DEVICE_ID   0x121A
1793 #define PCI_MMC_ADDR_CW     0x10
1794
1795 /* Avoid more than one attempt to probe pci smic. */
1796 static int pci_smic_checked = 0;
1797
1798 static int find_pci_smic(int intf_num, struct smi_info **new_info)
1799 {
1800         struct smi_info  *info;
1801         int              error;
1802         struct pci_dev   *pci_dev = NULL;
1803         u16              base_addr;
1804         int              fe_rmc = 0;
1805
1806         if (pci_smic_checked)
1807                 return -ENODEV;
1808
1809         pci_smic_checked = 1;
1810
1811         if ((pci_dev = pci_get_device(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID,
1812                                        NULL)))
1813                 ;
1814         else if ((pci_dev = pci_get_class(PCI_ERMC_CLASSCODE, NULL)) &&
1815                  pci_dev->subsystem_vendor == PCI_HP_VENDOR_ID)
1816                 fe_rmc = 1;
1817         else
1818                 return -ENODEV;
1819
1820         error = pci_read_config_word(pci_dev, PCI_MMC_ADDR_CW, &base_addr);
1821         if (error)
1822         {
1823                 pci_dev_put(pci_dev);
1824                 printk(KERN_ERR
1825                        "ipmi_si: pci_read_config_word() failed (%d).\n",
1826                        error);
1827                 return -ENODEV;
1828         }
1829
1830         /* Bit 0: 1 specifies programmed I/O, 0 specifies memory mapped I/O */
1831         if (!(base_addr & 0x0001))
1832         {
1833                 pci_dev_put(pci_dev);
1834                 printk(KERN_ERR
1835                        "ipmi_si: memory mapped I/O not supported for PCI"
1836                        " smic.\n");
1837                 return -ENODEV;
1838         }
1839
1840         base_addr &= 0xFFFE;
1841         if (!fe_rmc)
1842                 /* Data register starts at base address + 1 in eRMC */
1843                 ++base_addr;
1844
1845         if (!is_new_interface(-1, IPMI_IO_ADDR_SPACE, base_addr)) {
1846                 pci_dev_put(pci_dev);
1847                 return -ENODEV;
1848         }
1849
1850         info = kmalloc(sizeof(*info), GFP_KERNEL);
1851         if (!info) {
1852                 pci_dev_put(pci_dev);
1853                 printk(KERN_ERR "ipmi_si: Could not allocate SI data (5)\n");
1854                 return -ENOMEM;
1855         }
1856         memset(info, 0, sizeof(*info));
1857
1858         info->io_setup = port_setup;
1859         ports[intf_num] = base_addr;
1860         info->io.info = &(ports[intf_num]);
1861         info->io.regspacing = regspacings[intf_num];
1862         if (!info->io.regspacing)
1863                 info->io.regspacing = DEFAULT_REGSPACING;
1864         info->io.regsize = DEFAULT_REGSPACING;
1865         info->io.regshift = regshifts[intf_num];
1866
1867         *new_info = info;
1868
1869         irqs[intf_num] = pci_dev->irq;
1870         si_type[intf_num] = "smic";
1871
1872         printk("ipmi_si: Found PCI SMIC at I/O address 0x%lx\n",
1873                 (long unsigned int) base_addr);
1874
1875         pci_dev_put(pci_dev);
1876         return 0;
1877 }
1878 #endif /* CONFIG_PCI */
1879
1880 static int try_init_plug_and_play(int intf_num, struct smi_info **new_info)
1881 {
1882 #ifdef CONFIG_PCI
1883         if (find_pci_smic(intf_num, new_info)==0)
1884                 return 0;
1885 #endif
1886         /* Include other methods here. */
1887
1888         return -ENODEV;
1889 }
1890
1891
1892 static int try_get_dev_id(struct smi_info *smi_info)
1893 {
1894         unsigned char      msg[2];
1895         unsigned char      *resp;
1896         unsigned long      resp_len;
1897         enum si_sm_result smi_result;
1898         int               rv = 0;
1899
1900         resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1901         if (!resp)
1902                 return -ENOMEM;
1903
1904         /* Do a Get Device ID command, since it comes back with some
1905            useful info. */
1906         msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1907         msg[1] = IPMI_GET_DEVICE_ID_CMD;
1908         smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
1909
1910         smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
1911         for (;;)
1912         {
1913                 if (smi_result == SI_SM_CALL_WITH_DELAY) {
1914                         set_current_state(TASK_UNINTERRUPTIBLE);
1915                         schedule_timeout(1);
1916                         smi_result = smi_info->handlers->event(
1917                                 smi_info->si_sm, 100);
1918                 }
1919                 else if (smi_result == SI_SM_CALL_WITHOUT_DELAY)
1920                 {
1921                         smi_result = smi_info->handlers->event(
1922                                 smi_info->si_sm, 0);
1923                 }
1924                 else
1925                         break;
1926         }
1927         if (smi_result == SI_SM_HOSED) {
1928                 /* We couldn't get the state machine to run, so whatever's at
1929                    the port is probably not an IPMI SMI interface. */
1930                 rv = -ENODEV;
1931                 goto out;
1932         }
1933
1934         /* Otherwise, we got some data. */
1935         resp_len = smi_info->handlers->get_result(smi_info->si_sm,
1936                                                   resp, IPMI_MAX_MSG_LENGTH);
1937         if (resp_len < 6) {
1938                 /* That's odd, it should be longer. */
1939                 rv = -EINVAL;
1940                 goto out;
1941         }
1942
1943         if ((resp[1] != IPMI_GET_DEVICE_ID_CMD) || (resp[2] != 0)) {
1944                 /* That's odd, it shouldn't be able to fail. */
1945                 rv = -EINVAL;
1946                 goto out;
1947         }
1948
1949         /* Record info from the get device id, in case we need it. */
1950         smi_info->ipmi_si_dev_rev = resp[4] & 0xf;
1951         smi_info->ipmi_si_fw_rev_major = resp[5] & 0x7f;
1952         smi_info->ipmi_si_fw_rev_minor = resp[6];
1953         smi_info->ipmi_version_major = resp[7] & 0xf;
1954         smi_info->ipmi_version_minor = resp[7] >> 4;
1955
1956  out:
1957         kfree(resp);
1958         return rv;
1959 }
1960
1961 static int type_file_read_proc(char *page, char **start, off_t off,
1962                                int count, int *eof, void *data)
1963 {
1964         char            *out = (char *) page;
1965         struct smi_info *smi = data;
1966
1967         switch (smi->si_type) {
1968             case SI_KCS:
1969                 return sprintf(out, "kcs\n");
1970             case SI_SMIC:
1971                 return sprintf(out, "smic\n");
1972             case SI_BT:
1973                 return sprintf(out, "bt\n");
1974             default:
1975                 return 0;
1976         }
1977 }
1978
1979 static int stat_file_read_proc(char *page, char **start, off_t off,
1980                                int count, int *eof, void *data)
1981 {
1982         char            *out = (char *) page;
1983         struct smi_info *smi = data;
1984
1985         out += sprintf(out, "interrupts_enabled:    %d\n",
1986                        smi->irq && !smi->interrupt_disabled);
1987         out += sprintf(out, "short_timeouts:        %ld\n",
1988                        smi->short_timeouts);
1989         out += sprintf(out, "long_timeouts:         %ld\n",
1990                        smi->long_timeouts);
1991         out += sprintf(out, "timeout_restarts:      %ld\n",
1992                        smi->timeout_restarts);
1993         out += sprintf(out, "idles:                 %ld\n",
1994                        smi->idles);
1995         out += sprintf(out, "interrupts:            %ld\n",
1996                        smi->interrupts);
1997         out += sprintf(out, "attentions:            %ld\n",
1998                        smi->attentions);
1999         out += sprintf(out, "flag_fetches:          %ld\n",
2000                        smi->flag_fetches);
2001         out += sprintf(out, "hosed_count:           %ld\n",
2002                        smi->hosed_count);
2003         out += sprintf(out, "complete_transactions: %ld\n",
2004                        smi->complete_transactions);
2005         out += sprintf(out, "events:                %ld\n",
2006                        smi->events);
2007         out += sprintf(out, "watchdog_pretimeouts:  %ld\n",
2008                        smi->watchdog_pretimeouts);
2009         out += sprintf(out, "incoming_messages:     %ld\n",
2010                        smi->incoming_messages);
2011
2012         return (out - ((char *) page));
2013 }
2014
2015 /* Returns 0 if initialized, or negative on an error. */
2016 static int init_one_smi(int intf_num, struct smi_info **smi)
2017 {
2018         int             rv;
2019         struct smi_info *new_smi;
2020
2021
2022         rv = try_init_mem(intf_num, &new_smi);
2023         if (rv)
2024                 rv = try_init_port(intf_num, &new_smi);
2025 #ifdef CONFIG_ACPI_INTERPRETER
2026         if ((rv) && (si_trydefaults)) {
2027                 rv = try_init_acpi(intf_num, &new_smi);
2028         }
2029 #endif
2030 #ifdef CONFIG_X86
2031         if ((rv) && (si_trydefaults)) {
2032                 rv = try_init_smbios(intf_num, &new_smi);
2033         }
2034 #endif
2035         if ((rv) && (si_trydefaults)) {
2036                 rv = try_init_plug_and_play(intf_num, &new_smi);
2037         }
2038
2039
2040         if (rv)
2041                 return rv;
2042
2043         /* So we know not to free it unless we have allocated one. */
2044         new_smi->intf = NULL;
2045         new_smi->si_sm = NULL;
2046         new_smi->handlers = NULL;
2047
2048         if (!new_smi->irq_setup) {
2049                 new_smi->irq = irqs[intf_num];
2050                 new_smi->irq_setup = std_irq_setup;
2051                 new_smi->irq_cleanup = std_irq_cleanup;
2052         }
2053
2054         /* Default to KCS if no type is specified. */
2055         if (si_type[intf_num] == NULL) {
2056                 if (si_trydefaults)
2057                         si_type[intf_num] = "kcs";
2058                 else {
2059                         rv = -EINVAL;
2060                         goto out_err;
2061                 }
2062         }
2063
2064         /* Set up the state machine to use. */
2065         if (strcmp(si_type[intf_num], "kcs") == 0) {
2066                 new_smi->handlers = &kcs_smi_handlers;
2067                 new_smi->si_type = SI_KCS;
2068         } else if (strcmp(si_type[intf_num], "smic") == 0) {
2069                 new_smi->handlers = &smic_smi_handlers;
2070                 new_smi->si_type = SI_SMIC;
2071         } else if (strcmp(si_type[intf_num], "bt") == 0) {
2072                 new_smi->handlers = &bt_smi_handlers;
2073                 new_smi->si_type = SI_BT;
2074         } else {
2075                 /* No support for anything else yet. */
2076                 rv = -EIO;
2077                 goto out_err;
2078         }
2079
2080         /* Allocate the state machine's data and initialize it. */
2081         new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL);
2082         if (!new_smi->si_sm) {
2083                 printk(" Could not allocate state machine memory\n");
2084                 rv = -ENOMEM;
2085                 goto out_err;
2086         }
2087         new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm,
2088                                                         &new_smi->io);
2089
2090         /* Now that we know the I/O size, we can set up the I/O. */
2091         rv = new_smi->io_setup(new_smi);
2092         if (rv) {
2093                 printk(" Could not set up I/O space\n");
2094                 goto out_err;
2095         }
2096
2097         spin_lock_init(&(new_smi->si_lock));
2098         spin_lock_init(&(new_smi->msg_lock));
2099         spin_lock_init(&(new_smi->count_lock));
2100
2101         /* Do low-level detection first. */
2102         if (new_smi->handlers->detect(new_smi->si_sm)) {
2103                 rv = -ENODEV;
2104                 goto out_err;
2105         }
2106
2107         /* Attempt a get device id command.  If it fails, we probably
2108            don't have a SMI here. */
2109         rv = try_get_dev_id(new_smi);
2110         if (rv)
2111                 goto out_err;
2112
2113         /* Try to claim any interrupts. */
2114         new_smi->irq_setup(new_smi);
2115
2116         INIT_LIST_HEAD(&(new_smi->xmit_msgs));
2117         INIT_LIST_HEAD(&(new_smi->hp_xmit_msgs));
2118         new_smi->curr_msg = NULL;
2119         atomic_set(&new_smi->req_events, 0);
2120         new_smi->run_to_completion = 0;
2121
2122         new_smi->interrupt_disabled = 0;
2123         new_smi->timer_stopped = 0;
2124         new_smi->stop_operation = 0;
2125
2126         /* Start clearing the flags before we enable interrupts or the
2127            timer to avoid racing with the timer. */
2128         start_clear_flags(new_smi);
2129         /* IRQ is defined to be set when non-zero. */
2130         if (new_smi->irq)
2131                 new_smi->si_state = SI_CLEARING_FLAGS_THEN_SET_IRQ;
2132
2133         /* The ipmi_register_smi() code does some operations to
2134            determine the channel information, so we must be ready to
2135            handle operations before it is called.  This means we have
2136            to stop the timer if we get an error after this point. */
2137         init_timer(&(new_smi->si_timer));
2138         new_smi->si_timer.data = (long) new_smi;
2139         new_smi->si_timer.function = smi_timeout;
2140         new_smi->last_timeout_jiffies = jiffies;
2141         new_smi->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
2142         add_timer(&(new_smi->si_timer));
2143
2144         rv = ipmi_register_smi(&handlers,
2145                                new_smi,
2146                                new_smi->ipmi_version_major,
2147                                new_smi->ipmi_version_minor,
2148                                new_smi->slave_addr,
2149                                &(new_smi->intf));
2150         if (rv) {
2151                 printk(KERN_ERR
2152                        "ipmi_si: Unable to register device: error %d\n",
2153                        rv);
2154                 goto out_err_stop_timer;
2155         }
2156
2157         rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
2158                                      type_file_read_proc, NULL,
2159                                      new_smi, THIS_MODULE);
2160         if (rv) {
2161                 printk(KERN_ERR
2162                        "ipmi_si: Unable to create proc entry: %d\n",
2163                        rv);
2164                 goto out_err_stop_timer;
2165         }
2166
2167         rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
2168                                      stat_file_read_proc, NULL,
2169                                      new_smi, THIS_MODULE);
2170         if (rv) {
2171                 printk(KERN_ERR
2172                        "ipmi_si: Unable to create proc entry: %d\n",
2173                        rv);
2174                 goto out_err_stop_timer;
2175         }
2176
2177         *smi = new_smi;
2178
2179         printk(" IPMI %s interface initialized\n", si_type[intf_num]);
2180
2181         return 0;
2182
2183  out_err_stop_timer:
2184         new_smi->stop_operation = 1;
2185
2186         /* Wait for the timer to stop.  This avoids problems with race
2187            conditions removing the timer here. */
2188         while (!new_smi->timer_stopped) {
2189                 set_current_state(TASK_UNINTERRUPTIBLE);
2190                 schedule_timeout(1);
2191         }
2192
2193  out_err:
2194         if (new_smi->intf)
2195                 ipmi_unregister_smi(new_smi->intf);
2196
2197         new_smi->irq_cleanup(new_smi);
2198
2199         /* Wait until we know that we are out of any interrupt
2200            handlers might have been running before we freed the
2201            interrupt. */
2202         synchronize_sched();
2203
2204         if (new_smi->si_sm) {
2205                 if (new_smi->handlers)
2206                         new_smi->handlers->cleanup(new_smi->si_sm);
2207                 kfree(new_smi->si_sm);
2208         }
2209         new_smi->io_cleanup(new_smi);
2210
2211         return rv;
2212 }
2213
2214 static __init int init_ipmi_si(void)
2215 {
2216         int  rv = 0;
2217         int  pos = 0;
2218         int  i;
2219         char *str;
2220
2221         if (initialized)
2222                 return 0;
2223         initialized = 1;
2224
2225         /* Parse out the si_type string into its components. */
2226         str = si_type_str;
2227         if (*str != '\0') {
2228                 for (i=0; (i<SI_MAX_PARMS) && (*str != '\0'); i++) {
2229                         si_type[i] = str;
2230                         str = strchr(str, ',');
2231                         if (str) {
2232                                 *str = '\0';
2233                                 str++;
2234                         } else {
2235                                 break;
2236                         }
2237                 }
2238         }
2239
2240         printk(KERN_INFO "IPMI System Interface driver version "
2241                IPMI_SI_VERSION);
2242         if (kcs_smi_handlers.version)
2243                 printk(", KCS version %s", kcs_smi_handlers.version);
2244         if (smic_smi_handlers.version)
2245                 printk(", SMIC version %s", smic_smi_handlers.version);
2246         if (bt_smi_handlers.version)
2247                 printk(", BT version %s", bt_smi_handlers.version);
2248         printk("\n");
2249
2250 #ifdef CONFIG_X86
2251         dmi_decode();
2252 #endif
2253
2254         rv = init_one_smi(0, &(smi_infos[pos]));
2255         if (rv && !ports[0] && si_trydefaults) {
2256                 /* If we are trying defaults and the initial port is
2257                    not set, then set it. */
2258                 si_type[0] = "kcs";
2259                 ports[0] = DEFAULT_KCS_IO_PORT;
2260                 rv = init_one_smi(0, &(smi_infos[pos]));
2261                 if (rv) {
2262                         /* No KCS - try SMIC */
2263                         si_type[0] = "smic";
2264                         ports[0] = DEFAULT_SMIC_IO_PORT;
2265                         rv = init_one_smi(0, &(smi_infos[pos]));
2266                 }
2267                 if (rv) {
2268                         /* No SMIC - try BT */
2269                         si_type[0] = "bt";
2270                         ports[0] = DEFAULT_BT_IO_PORT;
2271                         rv = init_one_smi(0, &(smi_infos[pos]));
2272                 }
2273         }
2274         if (rv == 0)
2275                 pos++;
2276
2277         for (i=1; i < SI_MAX_PARMS; i++) {
2278                 rv = init_one_smi(i, &(smi_infos[pos]));
2279                 if (rv == 0)
2280                         pos++;
2281         }
2282
2283         if (smi_infos[0] == NULL) {
2284                 printk("ipmi_si: Unable to find any System Interface(s)\n");
2285                 return -ENODEV;
2286         }
2287
2288         return 0;
2289 }
2290 module_init(init_ipmi_si);
2291
2292 static void __exit cleanup_one_si(struct smi_info *to_clean)
2293 {
2294         int           rv;
2295         unsigned long flags;
2296
2297         if (! to_clean)
2298                 return;
2299
2300         /* Tell the timer and interrupt handlers that we are shutting
2301            down. */
2302         spin_lock_irqsave(&(to_clean->si_lock), flags);
2303         spin_lock(&(to_clean->msg_lock));
2304
2305         to_clean->stop_operation = 1;
2306
2307         to_clean->irq_cleanup(to_clean);
2308
2309         spin_unlock(&(to_clean->msg_lock));
2310         spin_unlock_irqrestore(&(to_clean->si_lock), flags);
2311
2312         /* Wait until we know that we are out of any interrupt
2313            handlers might have been running before we freed the
2314            interrupt. */
2315         synchronize_sched();
2316
2317         /* Wait for the timer to stop.  This avoids problems with race
2318            conditions removing the timer here. */
2319         while (!to_clean->timer_stopped) {
2320                 set_current_state(TASK_UNINTERRUPTIBLE);
2321                 schedule_timeout(1);
2322         }
2323
2324         /* Interrupts and timeouts are stopped, now make sure the
2325            interface is in a clean state. */
2326         while ((to_clean->curr_msg) || (to_clean->si_state != SI_NORMAL)) {
2327                 poll(to_clean);
2328                 set_current_state(TASK_UNINTERRUPTIBLE);
2329                 schedule_timeout(1);
2330         }
2331
2332         rv = ipmi_unregister_smi(to_clean->intf);
2333         if (rv) {
2334                 printk(KERN_ERR
2335                        "ipmi_si: Unable to unregister device: errno=%d\n",
2336                        rv);
2337         }
2338
2339         to_clean->handlers->cleanup(to_clean->si_sm);
2340
2341         kfree(to_clean->si_sm);
2342
2343         to_clean->io_cleanup(to_clean);
2344 }
2345
2346 static __exit void cleanup_ipmi_si(void)
2347 {
2348         int i;
2349
2350         if (!initialized)
2351                 return;
2352
2353         for (i=0; i<SI_MAX_DRIVERS; i++) {
2354                 cleanup_one_si(smi_infos[i]);
2355         }
2356 }
2357 module_exit(cleanup_ipmi_si);
2358
2359 MODULE_LICENSE("GPL");