arch/arm/mach-msm/smd.c

   1 /* arch/arm/mach-msm/smd.c
   2  *
   3  * Copyright (C) 2007 Google, Inc.
   4  * Author: Brian Swetland <swetland@google.com>
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/platform_device.h>
  18 #include <linux/module.h>
  19 #include <linux/fs.h>
  20 #include <linux/cdev.h>
  21 #include <linux/device.h>
  22 #include <linux/wait.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/irq.h>
  25 #include <linux/list.h>
  26 #include <linux/slab.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/delay.h>
  29
  30 #include <mach/msm_smd.h>
  31 #include <mach/system.h>
  32
  33 #include "smd_private.h"
  34 #include "proc_comm.h"
  35
  36 #if defined(CONFIG_ARCH_QSD8X50)
  37 #define CONFIG_QDSP6 1
  38 #endif
  39
  40 void (*msm_hw_reset_hook)(void);
  41
  42 #define MODULE_NAME "msm_smd"
  43
  44 enum {
  45         MSM_SMD_DEBUG = 1U << 0,
  46         MSM_SMSM_DEBUG = 1U << 0,
  47 };
  48
  49 static int msm_smd_debug_mask;
  50
  51 struct shared_info {
  52         int ready;
  53         unsigned state;
  54 };
  55
  56 static unsigned dummy_state[SMSM_STATE_COUNT];
  57
  58 static struct shared_info smd_info = {
  59         .state = (unsigned) &dummy_state,
  60 };
  61
  62 module_param_named(debug_mask, msm_smd_debug_mask,
  63                    int, S_IRUGO | S_IWUSR | S_IWGRP);
  64
  65 static unsigned last_heap_free = 0xffffffff;
  66
  67 static inline void notify_other_smsm(void)
  68 {
  69         msm_a2m_int(5);
  70 #ifdef CONFIG_QDSP6
  71         msm_a2m_int(8);
  72 #endif
  73 }
  74
  75 static inline void notify_modem_smd(void)
  76 {
  77         msm_a2m_int(0);
  78 }
  79
  80 static inline void notify_dsp_smd(void)
  81 {
  82         msm_a2m_int(8);
  83 }
  84
  85 static void smd_diag(void)
  86 {
  87         char *x;
  88
  89         x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG);
  90         if (x != 0) {
  91                 x[SZ_DIAG_ERR_MSG - 1] = 0;
  92                 pr_info("smem: DIAG '%s'\n", x);
  93         }
  94 }
  95
  96 /* call when SMSM_RESET flag is set in the A9's smsm_state */
  97 static void handle_modem_crash(void)
  98 {
  99         pr_err("ARM9 has CRASHED\n");
 100         smd_diag();
 101
 102         /* hard reboot if possible */
 103         if (msm_hw_reset_hook)
 104                 msm_hw_reset_hook();
 105
 106         /* in this case the modem or watchdog should reboot us */
 107         for (;;)
 108                 ;
 109 }
 110
 111 uint32_t raw_smsm_get_state(enum smsm_state_item item)
 112 {
 113         return readl(smd_info.state + item * 4);
 114 }
 115
 116 static int check_for_modem_crash(void)
 117 {
 118         if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) {
 119                 handle_modem_crash();
 120                 return -1;
 121         }
 122         return 0;
 123 }
 124
 125 /* the spinlock is used to synchronize between the
 126  * irq handler and code that mutates the channel
 127  * list or fiddles with channel state
 128  */
 129 DEFINE_SPINLOCK(smd_lock);
 130 DEFINE_SPINLOCK(smem_lock);
 131
 132 /* the mutex is used during open() and close()
 133  * operations to avoid races while creating or
 134  * destroying smd_channel structures
 135  */
 136 static DEFINE_MUTEX(smd_creation_mutex);
 137
 138 static int smd_initialized;
 139
 140 LIST_HEAD(smd_ch_closed_list);
 141 LIST_HEAD(smd_ch_list_modem);
 142 LIST_HEAD(smd_ch_list_dsp);
 143
 144 static unsigned char smd_ch_allocated[64];
 145 static struct work_struct probe_work;
 146
 147 /* how many bytes are available for reading */
 148 static int smd_stream_read_avail(struct smd_channel *ch)
 149 {
 150         return (ch->recv->head - ch->recv->tail) & ch->fifo_mask;
 151 }
 152
 153 /* how many bytes we are free to write */
 154 static int smd_stream_write_avail(struct smd_channel *ch)
 155 {
 156         return ch->fifo_mask -
 157                 ((ch->send->head - ch->send->tail) & ch->fifo_mask);
 158 }
 159
 160 static int smd_packet_read_avail(struct smd_channel *ch)
 161 {
 162         if (ch->current_packet) {
 163                 int n = smd_stream_read_avail(ch);
 164                 if (n > ch->current_packet)
 165                         n = ch->current_packet;
 166                 return n;
 167         } else {
 168                 return 0;
 169         }
 170 }
 171
 172 static int smd_packet_write_avail(struct smd_channel *ch)
 173 {
 174         int n = smd_stream_write_avail(ch);
 175         return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0;
 176 }
 177
 178 static int ch_is_open(struct smd_channel *ch)
 179 {
 180         return (ch->recv->state == SMD_SS_OPENED) &&
 181                 (ch->send->state == SMD_SS_OPENED);
 182 }
 183
 184 /* provide a pointer and length to readable data in the fifo */
 185 static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr)
 186 {
 187         unsigned head = ch->recv->head;
 188         unsigned tail = ch->recv->tail;
 189         *ptr = (void *) (ch->recv_data + tail);
 190
 191         if (tail <= head)
 192                 return head - tail;
 193         else
 194                 return ch->fifo_size - tail;
 195 }
 196
 197 /* advance the fifo read pointer after data from ch_read_buffer is consumed */
 198 static void ch_read_done(struct smd_channel *ch, unsigned count)
 199 {
 200         BUG_ON(count > smd_stream_read_avail(ch));
 201         ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask;
 202         ch->send->fTAIL = 1;
 203 }
 204
 205 /* basic read interface to ch_read_{buffer,done} used
 206  * by smd_*_read() and update_packet_state()
 207  * will read-and-discard if the _data pointer is null
 208  */
 209 static int ch_read(struct smd_channel *ch, void *_data, int len)
 210 {
 211         void *ptr;
 212         unsigned n;
 213         unsigned char *data = _data;
 214         int orig_len = len;
 215
 216         while (len > 0) {
 217                 n = ch_read_buffer(ch, &ptr);
 218                 if (n == 0)
 219                         break;
 220
 221                 if (n > len)
 222                         n = len;
 223                 if (_data)
 224                         memcpy(data, ptr, n);
 225
 226                 data += n;
 227                 len -= n;
 228                 ch_read_done(ch, n);
 229         }
 230
 231         return orig_len - len;
 232 }
 233
 234 static void update_stream_state(struct smd_channel *ch)
 235 {
 236         /* streams have no special state requiring updating */
 237 }
 238
 239 static void update_packet_state(struct smd_channel *ch)
 240 {
 241         unsigned hdr[5];
 242         int r;
 243
 244         /* can't do anything if we're in the middle of a packet */
 245         if (ch->current_packet != 0)
 246                 return;
 247
 248         /* don't bother unless we can get the full header */
 249         if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE)
 250                 return;
 251
 252         r = ch_read(ch, hdr, SMD_HEADER_SIZE);
 253         BUG_ON(r != SMD_HEADER_SIZE);
 254
 255         ch->current_packet = hdr[0];
 256 }
 257
 258 /* provide a pointer and length to next free space in the fifo */
 259 static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr)
 260 {
 261         unsigned head = ch->send->head;
 262         unsigned tail = ch->send->tail;
 263         *ptr = (void *) (ch->send_data + head);
 264
 265         if (head < tail) {
 266                 return tail - head - 1;
 267         } else {
 268                 if (tail == 0)
 269                         return ch->fifo_size - head - 1;
 270                 else
 271                         return ch->fifo_size - head;
 272         }
 273 }
 274
 275 /* advace the fifo write pointer after freespace
 276  * from ch_write_buffer is filled
 277  */
 278 static void ch_write_done(struct smd_channel *ch, unsigned count)
 279 {
 280         BUG_ON(count > smd_stream_write_avail(ch));
 281         ch->send->head = (ch->send->head + count) & ch->fifo_mask;
 282         ch->send->fHEAD = 1;
 283 }
 284
 285 static void ch_set_state(struct smd_channel *ch, unsigned n)
 286 {
 287         if (n == SMD_SS_OPENED) {
 288                 ch->send->fDSR = 1;
 289                 ch->send->fCTS = 1;
 290                 ch->send->fCD = 1;
 291         } else {
 292                 ch->send->fDSR = 0;
 293                 ch->send->fCTS = 0;
 294                 ch->send->fCD = 0;
 295         }
 296         ch->send->state = n;
 297         ch->send->fSTATE = 1;
 298         ch->notify_other_cpu();
 299 }
 300
 301 static void do_smd_probe(void)
 302 {
 303         struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
 304         if (shared->heap_info.free_offset != last_heap_free) {
 305                 last_heap_free = shared->heap_info.free_offset;
 306                 schedule_work(&probe_work);
 307         }
 308 }
 309
 310 static void smd_state_change(struct smd_channel *ch,
 311                              unsigned last, unsigned next)
 312 {
 313         ch->last_state = next;
 314
 315         pr_info("SMD: ch %d %d -> %d\n", ch->n, last, next);
 316
 317         switch (next) {
 318         case SMD_SS_OPENING:
 319                 ch->recv->tail = 0;
 320         case SMD_SS_OPENED:
 321                 if (ch->send->state != SMD_SS_OPENED)
 322                         ch_set_state(ch, SMD_SS_OPENED);
 323                 ch->notify(ch->priv, SMD_EVENT_OPEN);
 324                 break;
 325         case SMD_SS_FLUSHING:
 326         case SMD_SS_RESET:
 327                 /* we should force them to close? */
 328         default:
 329                 ch->notify(ch->priv, SMD_EVENT_CLOSE);
 330         }
 331 }
 332
 333 static void handle_smd_irq(struct list_head *list, void (*notify)(void))
 334 {
 335         unsigned long flags;
 336         struct smd_channel *ch;
 337         int do_notify = 0;
 338         unsigned ch_flags;
 339         unsigned tmp;
 340
 341         spin_lock_irqsave(&smd_lock, flags);
 342         list_for_each_entry(ch, list, ch_list) {
 343                 ch_flags = 0;
 344                 if (ch_is_open(ch)) {
 345                         if (ch->recv->fHEAD) {
 346                                 ch->recv->fHEAD = 0;
 347                                 ch_flags |= 1;
 348                                 do_notify |= 1;
 349                         }
 350                         if (ch->recv->fTAIL) {
 351                                 ch->recv->fTAIL = 0;
 352                                 ch_flags |= 2;
 353                                 do_notify |= 1;
 354                         }
 355                         if (ch->recv->fSTATE) {
 356                                 ch->recv->fSTATE = 0;
 357                                 ch_flags |= 4;
 358                                 do_notify |= 1;
 359                         }
 360                 }
 361                 tmp = ch->recv->state;
 362                 if (tmp != ch->last_state)
 363                         smd_state_change(ch, ch->last_state, tmp);
 364                 if (ch_flags) {
 365                         ch->update_state(ch);
 366                         ch->notify(ch->priv, SMD_EVENT_DATA);
 367                 }
 368         }
 369         if (do_notify)
 370                 notify();
 371         spin_unlock_irqrestore(&smd_lock, flags);
 372         do_smd_probe();
 373 }
 374
 375 static irqreturn_t smd_modem_irq_handler(int irq, void *data)
 376 {
 377         handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
 378         return IRQ_HANDLED;
 379 }
 380
 381 #if defined(CONFIG_QDSP6)
 382 static irqreturn_t smd_dsp_irq_handler(int irq, void *data)
 383 {
 384         handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
 385         return IRQ_HANDLED;
 386 }
 387 #endif
 388
 389 static void smd_fake_irq_handler(unsigned long arg)
 390 {
 391         handle_smd_irq(&smd_ch_list_modem, notify_modem_smd);
 392         handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd);
 393 }
 394
 395 static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0);
 396
 397 static inline int smd_need_int(struct smd_channel *ch)
 398 {
 399         if (ch_is_open(ch)) {
 400                 if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE)
 401                         return 1;
 402                 if (ch->recv->state != ch->last_state)
 403                         return 1;
 404         }
 405         return 0;
 406 }
 407
 408 void smd_sleep_exit(void)
 409 {
 410         unsigned long flags;
 411         struct smd_channel *ch;
 412         int need_int = 0;
 413
 414         spin_lock_irqsave(&smd_lock, flags);
 415         list_for_each_entry(ch, &smd_ch_list_modem, ch_list) {
 416                 if (smd_need_int(ch)) {
 417                         need_int = 1;
 418                         break;
 419                 }
 420         }
 421         list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) {
 422                 if (smd_need_int(ch)) {
 423                         need_int = 1;
 424                         break;
 425                 }
 426         }
 427         spin_unlock_irqrestore(&smd_lock, flags);
 428         do_smd_probe();
 429
 430         if (need_int) {
 431                 if (msm_smd_debug_mask & MSM_SMD_DEBUG)
 432                         pr_info("smd_sleep_exit need interrupt\n");
 433                 tasklet_schedule(&smd_fake_irq_tasklet);
 434         }
 435 }
 436
 437
 438 void smd_kick(smd_channel_t *ch)
 439 {
 440         unsigned long flags;
 441         unsigned tmp;
 442
 443         spin_lock_irqsave(&smd_lock, flags);
 444         ch->update_state(ch);
 445         tmp = ch->recv->state;
 446         if (tmp != ch->last_state) {
 447                 ch->last_state = tmp;
 448                 if (tmp == SMD_SS_OPENED)
 449                         ch->notify(ch->priv, SMD_EVENT_OPEN);
 450                 else
 451                         ch->notify(ch->priv, SMD_EVENT_CLOSE);
 452         }
 453         ch->notify(ch->priv, SMD_EVENT_DATA);
 454         ch->notify_other_cpu();
 455         spin_unlock_irqrestore(&smd_lock, flags);
 456 }
 457
 458 static int smd_is_packet(int chn, unsigned type)
 459 {
 460         type &= SMD_KIND_MASK;
 461         if (type == SMD_KIND_PACKET)
 462                 return 1;
 463         if (type == SMD_KIND_STREAM)
 464                 return 0;
 465
 466         /* older AMSS reports SMD_KIND_UNKNOWN always */
 467         if ((chn > 4) || (chn == 1))
 468                 return 1;
 469         else
 470                 return 0;
 471 }
 472
 473 static int smd_stream_write(smd_channel_t *ch, const void *_data, int len)
 474 {
 475         void *ptr;
 476         const unsigned char *buf = _data;
 477         unsigned xfer;
 478         int orig_len = len;
 479
 480         if (len < 0)
 481                 return -EINVAL;
 482
 483         while ((xfer = ch_write_buffer(ch, &ptr)) != 0) {
 484                 if (!ch_is_open(ch))
 485                         break;
 486                 if (xfer > len)
 487                         xfer = len;
 488                 memcpy(ptr, buf, xfer);
 489                 ch_write_done(ch, xfer);
 490                 len -= xfer;
 491                 buf += xfer;
 492                 if (len == 0)
 493                         break;
 494         }
 495
 496         ch->notify_other_cpu();
 497
 498         return orig_len - len;
 499 }
 500
 501 static int smd_packet_write(smd_channel_t *ch, const void *_data, int len)
 502 {
 503         unsigned hdr[5];
 504
 505         if (len < 0)
 506                 return -EINVAL;
 507
 508         if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE))
 509                 return -ENOMEM;
 510
 511         hdr[0] = len;
 512         hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0;
 513
 514         smd_stream_write(ch, hdr, sizeof(hdr));
 515         smd_stream_write(ch, _data, len);
 516
 517         return len;
 518 }
 519
 520 static int smd_stream_read(smd_channel_t *ch, void *data, int len)
 521 {
 522         int r;
 523
 524         if (len < 0)
 525                 return -EINVAL;
 526
 527         r = ch_read(ch, data, len);
 528         if (r > 0)
 529                 ch->notify_other_cpu();
 530
 531         return r;
 532 }
 533
 534 static int smd_packet_read(smd_channel_t *ch, void *data, int len)
 535 {
 536         unsigned long flags;
 537         int r;
 538
 539         if (len < 0)
 540                 return -EINVAL;
 541
 542         if (len > ch->current_packet)
 543                 len = ch->current_packet;
 544
 545         r = ch_read(ch, data, len);
 546         if (r > 0)
 547                 ch->notify_other_cpu();
 548
 549         spin_lock_irqsave(&smd_lock, flags);
 550         ch->current_packet -= r;
 551         update_packet_state(ch);
 552         spin_unlock_irqrestore(&smd_lock, flags);
 553
 554         return r;
 555 }
 556
 557 static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type)
 558 {
 559         struct smd_channel *ch;
 560
 561         ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL);
 562         if (ch == 0) {
 563                 pr_err("smd_alloc_channel() out of memory\n");
 564                 return -1;
 565         }
 566         ch->n = cid;
 567
 568         if (_smd_alloc_channel(ch)) {
 569                 kfree(ch);
 570                 return -1;
 571         }
 572
 573         ch->fifo_mask = ch->fifo_size - 1;
 574         ch->type = type;
 575
 576         if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
 577                 ch->notify_other_cpu = notify_modem_smd;
 578         else
 579                 ch->notify_other_cpu = notify_dsp_smd;
 580
 581         if (smd_is_packet(cid, type)) {
 582                 ch->read = smd_packet_read;
 583                 ch->write = smd_packet_write;
 584                 ch->read_avail = smd_packet_read_avail;
 585                 ch->write_avail = smd_packet_write_avail;
 586                 ch->update_state = update_packet_state;
 587         } else {
 588                 ch->read = smd_stream_read;
 589                 ch->write = smd_stream_write;
 590                 ch->read_avail = smd_stream_read_avail;
 591                 ch->write_avail = smd_stream_write_avail;
 592                 ch->update_state = update_stream_state;
 593         }
 594
 595         if ((type & 0xff) == 0)
 596                 memcpy(ch->name, "SMD_", 4);
 597         else
 598                 memcpy(ch->name, "DSP_", 4);
 599         memcpy(ch->name + 4, name, 20);
 600         ch->name[23] = 0;
 601         ch->pdev.name = ch->name;
 602         ch->pdev.id = -1;
 603
 604         pr_info("smd_alloc_channel() cid=%02d size=%05d '%s'\n",
 605                 ch->n, ch->fifo_size, ch->name);
 606
 607         mutex_lock(&smd_creation_mutex);
 608         list_add(&ch->ch_list, &smd_ch_closed_list);
 609         mutex_unlock(&smd_creation_mutex);
 610
 611         platform_device_register(&ch->pdev);
 612         return 0;
 613 }
 614
 615 static void smd_channel_probe_worker(struct work_struct *work)
 616 {
 617         struct smd_alloc_elm *shared;
 618         unsigned ctype;
 619         unsigned type;
 620         unsigned n;
 621
 622         shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64);
 623         if (!shared) {
 624                 pr_err("smd: cannot find allocation table\n");
 625                 return;
 626         }
 627         for (n = 0; n < 64; n++) {
 628                 if (smd_ch_allocated[n])
 629                         continue;
 630                 if (!shared[n].ref_count)
 631                         continue;
 632                 if (!shared[n].name[0])
 633                         continue;
 634                 ctype = shared[n].ctype;
 635                 type = ctype & SMD_TYPE_MASK;
 636
 637                 /* DAL channels are stream but neither the modem,
 638                  * nor the DSP correctly indicate this.  Fixup manually.
 639                  */
 640                 if (!memcmp(shared[n].name, "DAL", 3))
 641                         ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM;
 642
 643                 type = shared[n].ctype & SMD_TYPE_MASK;
 644                 if ((type == SMD_TYPE_APPS_MODEM) ||
 645                     (type == SMD_TYPE_APPS_DSP))
 646                         if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype))
 647                                 smd_ch_allocated[n] = 1;
 648         }
 649 }
 650
 651 static void do_nothing_notify(void *priv, unsigned flags)
 652 {
 653 }
 654
 655 struct smd_channel *smd_get_channel(const char *name)
 656 {
 657         struct smd_channel *ch;
 658
 659         mutex_lock(&smd_creation_mutex);
 660         list_for_each_entry(ch, &smd_ch_closed_list, ch_list) {
 661                 if (!strcmp(name, ch->name)) {
 662                         list_del(&ch->ch_list);
 663                         mutex_unlock(&smd_creation_mutex);
 664                         return ch;
 665                 }
 666         }
 667         mutex_unlock(&smd_creation_mutex);
 668
 669         return NULL;
 670 }
 671
 672 int smd_open(const char *name, smd_channel_t **_ch,
 673              void *priv, void (*notify)(void *, unsigned))
 674 {
 675         struct smd_channel *ch;
 676         unsigned long flags;
 677
 678         if (smd_initialized == 0) {
 679                 pr_info("smd_open() before smd_init()\n");
 680                 return -ENODEV;
 681         }
 682
 683         ch = smd_get_channel(name);
 684         if (!ch)
 685                 return -ENODEV;
 686
 687         if (notify == 0)
 688                 notify = do_nothing_notify;
 689
 690         ch->notify = notify;
 691         ch->current_packet = 0;
 692         ch->last_state = SMD_SS_CLOSED;
 693         ch->priv = priv;
 694
 695         *_ch = ch;
 696
 697         spin_lock_irqsave(&smd_lock, flags);
 698
 699         if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM)
 700                 list_add(&ch->ch_list, &smd_ch_list_modem);
 701         else
 702                 list_add(&ch->ch_list, &smd_ch_list_dsp);
 703
 704         /* If the remote side is CLOSING, we need to get it to
 705          * move to OPENING (which we'll do by moving from CLOSED to
 706          * OPENING) and then get it to move from OPENING to
 707          * OPENED (by doing the same state change ourselves).
 708          *
 709          * Otherwise, it should be OPENING and we can move directly
 710          * to OPENED so that it will follow.
 711          */
 712         if (ch->recv->state == SMD_SS_CLOSING) {
 713                 ch->send->head = 0;
 714                 ch_set_state(ch, SMD_SS_OPENING);
 715         } else {
 716                 ch_set_state(ch, SMD_SS_OPENED);
 717         }
 718         spin_unlock_irqrestore(&smd_lock, flags);
 719         smd_kick(ch);
 720
 721         return 0;
 722 }
 723
 724 int smd_close(smd_channel_t *ch)
 725 {
 726         unsigned long flags;
 727
 728         pr_info("smd_close(%p)\n", ch);
 729
 730         if (ch == 0)
 731                 return -1;
 732
 733         spin_lock_irqsave(&smd_lock, flags);
 734         ch->notify = do_nothing_notify;
 735         list_del(&ch->ch_list);
 736         ch_set_state(ch, SMD_SS_CLOSED);
 737         spin_unlock_irqrestore(&smd_lock, flags);
 738
 739         mutex_lock(&smd_creation_mutex);
 740         list_add(&ch->ch_list, &smd_ch_closed_list);
 741         mutex_unlock(&smd_creation_mutex);
 742
 743         return 0;
 744 }
 745
 746 int smd_read(smd_channel_t *ch, void *data, int len)
 747 {
 748         return ch->read(ch, data, len);
 749 }
 750
 751 int smd_write(smd_channel_t *ch, const void *data, int len)
 752 {
 753         return ch->write(ch, data, len);
 754 }
 755
 756 int smd_write_atomic(smd_channel_t *ch, const void *data, int len)
 757 {
 758         unsigned long flags;
 759         int res;
 760         spin_lock_irqsave(&smd_lock, flags);
 761         res = ch->write(ch, data, len);
 762         spin_unlock_irqrestore(&smd_lock, flags);
 763         return res;
 764 }
 765
 766 int smd_read_avail(smd_channel_t *ch)
 767 {
 768         return ch->read_avail(ch);
 769 }
 770
 771 int smd_write_avail(smd_channel_t *ch)
 772 {
 773         return ch->write_avail(ch);
 774 }
 775
 776 int smd_wait_until_readable(smd_channel_t *ch, int bytes)
 777 {
 778         return -1;
 779 }
 780
 781 int smd_wait_until_writable(smd_channel_t *ch, int bytes)
 782 {
 783         return -1;
 784 }
 785
 786 int smd_cur_packet_size(smd_channel_t *ch)
 787 {
 788         return ch->current_packet;
 789 }
 790
 791
 792 /* ------------------------------------------------------------------------- */
 793
 794 void *smem_alloc(unsigned id, unsigned size)
 795 {
 796         return smem_find(id, size);
 797 }
 798
 799 void *smem_item(unsigned id, unsigned *size)
 800 {
 801         struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE;
 802         struct smem_heap_entry *toc = shared->heap_toc;
 803
 804         if (id >= SMEM_NUM_ITEMS)
 805                 return 0;
 806
 807         if (toc[id].allocated) {
 808                 *size = toc[id].size;
 809                 return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset);
 810         } else {
 811                 *size = 0;
 812         }
 813
 814         return 0;
 815 }
 816
 817 void *smem_find(unsigned id, unsigned size_in)
 818 {
 819         unsigned size;
 820         void *ptr;
 821
 822         ptr = smem_item(id, &size);
 823         if (!ptr)
 824                 return 0;
 825
 826         size_in = ALIGN(size_in, 8);
 827         if (size_in != size) {
 828                 pr_err("smem_find(%d, %d): wrong size %d\n",
 829                        id, size_in, size);
 830                 return 0;
 831         }
 832
 833         return ptr;
 834 }
 835
 836 static irqreturn_t smsm_irq_handler(int irq, void *data)
 837 {
 838         unsigned long flags;
 839         unsigned apps, modm;
 840
 841         spin_lock_irqsave(&smem_lock, flags);
 842
 843         apps = raw_smsm_get_state(SMSM_STATE_APPS);
 844         modm = raw_smsm_get_state(SMSM_STATE_MODEM);
 845
 846         if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
 847                 pr_info("<SM %08x %08x>\n", apps, modm);
 848         if (modm & SMSM_RESET)
 849                 handle_modem_crash();
 850
 851         do_smd_probe();
 852
 853         spin_unlock_irqrestore(&smem_lock, flags);
 854         return IRQ_HANDLED;
 855 }
 856
 857 int smsm_change_state(enum smsm_state_item item,
 858                       uint32_t clear_mask, uint32_t set_mask)
 859 {
 860         unsigned long addr = smd_info.state + item * 4;
 861         unsigned long flags;
 862         unsigned state;
 863
 864         if (!smd_info.ready)
 865                 return -EIO;
 866
 867         spin_lock_irqsave(&smem_lock, flags);
 868
 869         if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET)
 870                 handle_modem_crash();
 871
 872         state = (readl(addr) & ~clear_mask) | set_mask;
 873         writel(state, addr);
 874
 875         if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
 876                 pr_info("smsm_change_state %d %x\n", item, state);
 877         notify_other_smsm();
 878
 879         spin_unlock_irqrestore(&smem_lock, flags);
 880
 881         return 0;
 882 }
 883
 884 uint32_t smsm_get_state(enum smsm_state_item item)
 885 {
 886         unsigned long flags;
 887         uint32_t rv;
 888
 889         spin_lock_irqsave(&smem_lock, flags);
 890
 891         rv = readl(smd_info.state + item * 4);
 892
 893         if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET))
 894                 handle_modem_crash();
 895
 896         spin_unlock_irqrestore(&smem_lock, flags);
 897
 898         return rv;
 899 }
 900
 901 #ifdef CONFIG_ARCH_MSM_SCORPION
 902
 903 int smsm_set_sleep_duration(uint32_t delay)
 904 {
 905         struct msm_dem_slave_data *ptr;
 906
 907         ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr));
 908         if (ptr == NULL) {
 909                 pr_err("smsm_set_sleep_duration <SM NO APPS_DEM_SLAVE_DATA>\n");
 910                 return -EIO;
 911         }
 912         if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
 913                 pr_info("smsm_set_sleep_duration %d -> %d\n",
 914                        ptr->sleep_time, delay);
 915         ptr->sleep_time = delay;
 916         return 0;
 917 }
 918
 919 #else
 920
 921 int smsm_set_sleep_duration(uint32_t delay)
 922 {
 923         uint32_t *ptr;
 924
 925         ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr));
 926         if (ptr == NULL) {
 927                 pr_err("smsm_set_sleep_duration <SM NO SLEEP_DELAY>\n");
 928                 return -EIO;
 929         }
 930         if (msm_smd_debug_mask & MSM_SMSM_DEBUG)
 931                 pr_info("smsm_set_sleep_duration %d -> %d\n",
 932                        *ptr, delay);
 933         *ptr = delay;
 934         return 0;
 935 }
 936
 937 #endif
 938
 939 int smd_core_init(void)
 940 {
 941         int r;
 942         pr_info("smd_core_init()\n");
 943
 944         /* wait for essential items to be initialized */
 945         for (;;) {
 946                 unsigned size;
 947                 void *state;
 948                 state = smem_item(SMEM_SMSM_SHARED_STATE, &size);
 949                 if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) {
 950                         smd_info.state = (unsigned)state;
 951                         break;
 952                 }
 953         }
 954
 955         smd_info.ready = 1;
 956
 957         r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler,
 958                         IRQF_TRIGGER_RISING, "smd_dev", 0);
 959         if (r < 0)
 960                 return r;
 961         r = enable_irq_wake(INT_A9_M2A_0);
 962         if (r < 0)
 963                 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n");
 964
 965         r = request_irq(INT_A9_M2A_5, smsm_irq_handler,
 966                         IRQF_TRIGGER_RISING, "smsm_dev", 0);
 967         if (r < 0) {
 968                 free_irq(INT_A9_M2A_0, 0);
 969                 return r;
 970         }
 971         r = enable_irq_wake(INT_A9_M2A_5);
 972         if (r < 0)
 973                 pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n");
 974
 975 #if defined(CONFIG_QDSP6)
 976         r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler,
 977                         IRQF_TRIGGER_RISING, "smd_dsp", 0);
 978         if (r < 0) {
 979                 free_irq(INT_A9_M2A_0, 0);
 980                 free_irq(INT_A9_M2A_5, 0);
 981                 return r;
 982         }
 983 #endif
 984
 985         /* check for any SMD channels that may already exist */
 986         do_smd_probe();
 987
 988         /* indicate that we're up and running */
 989         smsm_change_state(SMSM_STATE_APPS,
 990                           ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN);
 991 #ifdef CONFIG_ARCH_MSM_SCORPION
 992         smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0);
 993 #endif
 994
 995         pr_info("smd_core_init() done\n");
 996
 997         return 0;
 998 }
 999
1000 static int __devinit msm_smd_probe(struct platform_device *pdev)
1001 {
1002         pr_info("smd_init()\n");
1003
1004         /*
1005          * If we haven't waited for the ARM9 to boot up till now,
1006          * then we need to wait here. Otherwise this should just
1007          * return immediately.
1008          */
1009         proc_comm_boot_wait();
1010
1011         INIT_WORK(&probe_work, smd_channel_probe_worker);
1012
1013         if (smd_core_init()) {
1014                 pr_err("smd_core_init() failed\n");
1015                 return -1;
1016         }
1017
1018         do_smd_probe();
1019
1020         msm_check_for_modem_crash = check_for_modem_crash;
1021
1022         msm_init_last_radio_log(THIS_MODULE);
1023
1024         smd_initialized = 1;
1025
1026         return 0;
1027 }
1028
1029 static struct platform_driver msm_smd_driver = {
1030         .probe = msm_smd_probe,
1031         .driver = {
1032                 .name = MODULE_NAME,
1033                 .owner = THIS_MODULE,
1034         },
1035 };
1036
1037 static int __init msm_smd_init(void)
1038 {
1039         return platform_driver_register(&msm_smd_driver);
1040 }
1041
1042 module_init(msm_smd_init);
1043
1044 MODULE_DESCRIPTION("MSM Shared Memory Core");
1045 MODULE_AUTHOR("Brian Swetland <swetland@google.com>");
1046 MODULE_LICENSE("GPL");