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