drivers/soc/ti/knav_qmss_queue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Keystone Queue Manager subsystem driver
   4  *
   5  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
   6  * Authors:     Sandeep Nair <[email protected]>
   7  *              Cyril Chemparathy <[email protected]>
   8  *              Santosh Shilimkar <[email protected]>
   9  */
  10
  11 #include <linux/debugfs.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/firmware.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/property.h>
  23 #include <linux/slab.h>
  24 #include <linux/soc/ti/knav_qmss.h>
  25
  26 #include "knav_qmss.h"
  27
  28 static struct knav_device *kdev;
  29 static DEFINE_MUTEX(knav_dev_lock);
  30 #define knav_dev_lock_held() \
  31         lockdep_is_held(&knav_dev_lock)
  32
  33 /* Queue manager register indices in DTS */
  34 #define KNAV_QUEUE_PEEK_REG_INDEX       0
  35 #define KNAV_QUEUE_STATUS_REG_INDEX     1
  36 #define KNAV_QUEUE_CONFIG_REG_INDEX     2
  37 #define KNAV_QUEUE_REGION_REG_INDEX     3
  38 #define KNAV_QUEUE_PUSH_REG_INDEX       4
  39 #define KNAV_QUEUE_POP_REG_INDEX        5
  40
  41 /* Queue manager register indices in DTS for QMSS in K2G NAVSS.
  42  * There are no status and vbusm push registers on this version
  43  * of QMSS. Push registers are same as pop, So all indices above 1
  44  * are to be re-defined
  45  */
  46 #define KNAV_L_QUEUE_CONFIG_REG_INDEX   1
  47 #define KNAV_L_QUEUE_REGION_REG_INDEX   2
  48 #define KNAV_L_QUEUE_PUSH_REG_INDEX     3
  49
  50 /* PDSP register indices in DTS */
  51 #define KNAV_QUEUE_PDSP_IRAM_REG_INDEX  0
  52 #define KNAV_QUEUE_PDSP_REGS_REG_INDEX  1
  53 #define KNAV_QUEUE_PDSP_INTD_REG_INDEX  2
  54 #define KNAV_QUEUE_PDSP_CMD_REG_INDEX   3
  55
  56 #define knav_queue_idx_to_inst(kdev, idx)                       \
  57         (kdev->instances + (idx << kdev->inst_shift))
  58
  59 #define for_each_handle_rcu(qh, inst)                           \
  60         list_for_each_entry_rcu(qh, &inst->handles, list,       \
  61                                 knav_dev_lock_held())
  62
  63 #define for_each_instance(idx, inst, kdev)              \
  64         for (idx = 0, inst = kdev->instances;           \
  65              idx < (kdev)->num_queues_in_use;                   \
  66              idx++, inst = knav_queue_idx_to_inst(kdev, idx))
  67
  68 /* All firmware file names end up here. List the firmware file names below.
  69  * Newest followed by older ones. Search is done from start of the array
  70  * until a firmware file is found.
  71  */
  72 static const char * const knav_acc_firmwares[] = {"ks2_qmss_pdsp_acc48.bin"};
  73
  74 static bool device_ready;
  75 bool knav_qmss_device_ready(void)
  76 {
  77         return device_ready;
  78 }
  79 EXPORT_SYMBOL_GPL(knav_qmss_device_ready);
  80
  81 /**
  82  * knav_queue_notify: qmss queue notfier call
  83  *
  84  * @inst:               - qmss queue instance like accumulator
  85  */
  86 void knav_queue_notify(struct knav_queue_inst *inst)
  87 {
  88         struct knav_queue *qh;
  89
  90         if (!inst)
  91                 return;
  92
  93         rcu_read_lock();
  94         for_each_handle_rcu(qh, inst) {
  95                 if (atomic_read(&qh->notifier_enabled) <= 0)
  96                         continue;
  97                 if (WARN_ON(!qh->notifier_fn))
  98                         continue;
  99                 this_cpu_inc(qh->stats->notifies);
 100                 qh->notifier_fn(qh->notifier_fn_arg);
 101         }
 102         rcu_read_unlock();
 103 }
 104 EXPORT_SYMBOL_GPL(knav_queue_notify);
 105
 106 static irqreturn_t knav_queue_int_handler(int irq, void *_instdata)
 107 {
 108         struct knav_queue_inst *inst = _instdata;
 109
 110         knav_queue_notify(inst);
 111         return IRQ_HANDLED;
 112 }
 113
 114 static int knav_queue_setup_irq(struct knav_range_info *range,
 115                           struct knav_queue_inst *inst)
 116 {
 117         unsigned queue = inst->id - range->queue_base;
 118         int ret = 0, irq;
 119
 120         if (range->flags & RANGE_HAS_IRQ) {
 121                 irq = range->irqs[queue].irq;
 122                 ret = request_irq(irq, knav_queue_int_handler, 0,
 123                                         inst->irq_name, inst);
 124                 if (ret)
 125                         return ret;
 126                 disable_irq(irq);
 127                 if (range->irqs[queue].cpu_mask) {
 128                         ret = irq_set_affinity_hint(irq, range->irqs[queue].cpu_mask);
 129                         if (ret) {
 130                                 dev_warn(range->kdev->dev,
 131                                          "Failed to set IRQ affinity\n");
 132                                 return ret;
 133                         }
 134                 }
 135         }
 136         return ret;
 137 }
 138
 139 static void knav_queue_free_irq(struct knav_queue_inst *inst)
 140 {
 141         struct knav_range_info *range = inst->range;
 142         unsigned queue = inst->id - inst->range->queue_base;
 143         int irq;
 144
 145         if (range->flags & RANGE_HAS_IRQ) {
 146                 irq = range->irqs[queue].irq;
 147                 irq_set_affinity_hint(irq, NULL);
 148                 free_irq(irq, inst);
 149         }
 150 }
 151
 152 static inline bool knav_queue_is_busy(struct knav_queue_inst *inst)
 153 {
 154         return !list_empty(&inst->handles);
 155 }
 156
 157 static inline bool knav_queue_is_reserved(struct knav_queue_inst *inst)
 158 {
 159         return inst->range->flags & RANGE_RESERVED;
 160 }
 161
 162 static inline bool knav_queue_is_shared(struct knav_queue_inst *inst)
 163 {
 164         struct knav_queue *tmp;
 165
 166         rcu_read_lock();
 167         for_each_handle_rcu(tmp, inst) {
 168                 if (tmp->flags & KNAV_QUEUE_SHARED) {
 169                         rcu_read_unlock();
 170                         return true;
 171                 }
 172         }
 173         rcu_read_unlock();
 174         return false;
 175 }
 176
 177 static inline bool knav_queue_match_type(struct knav_queue_inst *inst,
 178                                                 unsigned type)
 179 {
 180         if ((type == KNAV_QUEUE_QPEND) &&
 181             (inst->range->flags & RANGE_HAS_IRQ)) {
 182                 return true;
 183         } else if ((type == KNAV_QUEUE_ACC) &&
 184                 (inst->range->flags & RANGE_HAS_ACCUMULATOR)) {
 185                 return true;
 186         } else if ((type == KNAV_QUEUE_GP) &&
 187                 !(inst->range->flags &
 188                         (RANGE_HAS_ACCUMULATOR | RANGE_HAS_IRQ))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 static inline struct knav_queue_inst *
 195 knav_queue_match_id_to_inst(struct knav_device *kdev, unsigned id)
 196 {
 197         struct knav_queue_inst *inst;
 198         int idx;
 199
 200         for_each_instance(idx, inst, kdev) {
 201                 if (inst->id == id)
 202                         return inst;
 203         }
 204         return NULL;
 205 }
 206
 207 static inline struct knav_queue_inst *knav_queue_find_by_id(int id)
 208 {
 209         if (kdev->base_id <= id &&
 210             kdev->base_id + kdev->num_queues > id) {
 211                 id -= kdev->base_id;
 212                 return knav_queue_match_id_to_inst(kdev, id);
 213         }
 214         return NULL;
 215 }
 216
 217 static struct knav_queue *__knav_queue_open(struct knav_queue_inst *inst,
 218                                       const char *name, unsigned flags)
 219 {
 220         struct knav_queue *qh;
 221         unsigned id;
 222         int ret = 0;
 223
 224         qh = devm_kzalloc(inst->kdev->dev, sizeof(*qh), GFP_KERNEL);
 225         if (!qh)
 226                 return ERR_PTR(-ENOMEM);
 227
 228         qh->stats = alloc_percpu(struct knav_queue_stats);
 229         if (!qh->stats) {
 230                 ret = -ENOMEM;
 231                 goto err;
 232         }
 233
 234         qh->flags = flags;
 235         qh->inst = inst;
 236         id = inst->id - inst->qmgr->start_queue;
 237         qh->reg_push = &inst->qmgr->reg_push[id];
 238         qh->reg_pop = &inst->qmgr->reg_pop[id];
 239         qh->reg_peek = &inst->qmgr->reg_peek[id];
 240
 241         /* first opener? */
 242         if (!knav_queue_is_busy(inst)) {
 243                 struct knav_range_info *range = inst->range;
 244
 245                 inst->name = kstrndup(name, KNAV_NAME_SIZE - 1, GFP_KERNEL);
 246                 if (range->ops && range->ops->open_queue)
 247                         ret = range->ops->open_queue(range, inst, flags);
 248
 249                 if (ret)
 250                         goto err;
 251         }
 252         list_add_tail_rcu(&qh->list, &inst->handles);
 253         return qh;
 254
 255 err:
 256         if (qh->stats)
 257                 free_percpu(qh->stats);
 258         devm_kfree(inst->kdev->dev, qh);
 259         return ERR_PTR(ret);
 260 }
 261
 262 static struct knav_queue *
 263 knav_queue_open_by_id(const char *name, unsigned id, unsigned flags)
 264 {
 265         struct knav_queue_inst *inst;
 266         struct knav_queue *qh;
 267
 268         mutex_lock(&knav_dev_lock);
 269
 270         qh = ERR_PTR(-ENODEV);
 271         inst = knav_queue_find_by_id(id);
 272         if (!inst)
 273                 goto unlock_ret;
 274
 275         qh = ERR_PTR(-EEXIST);
 276         if (!(flags & KNAV_QUEUE_SHARED) && knav_queue_is_busy(inst))
 277                 goto unlock_ret;
 278
 279         qh = ERR_PTR(-EBUSY);
 280         if ((flags & KNAV_QUEUE_SHARED) &&
 281             (knav_queue_is_busy(inst) && !knav_queue_is_shared(inst)))
 282                 goto unlock_ret;
 283
 284         qh = __knav_queue_open(inst, name, flags);
 285
 286 unlock_ret:
 287         mutex_unlock(&knav_dev_lock);
 288
 289         return qh;
 290 }
 291
 292 static struct knav_queue *knav_queue_open_by_type(const char *name,
 293                                                 unsigned type, unsigned flags)
 294 {
 295         struct knav_queue_inst *inst;
 296         struct knav_queue *qh = ERR_PTR(-EINVAL);
 297         int idx;
 298
 299         mutex_lock(&knav_dev_lock);
 300
 301         for_each_instance(idx, inst, kdev) {
 302                 if (knav_queue_is_reserved(inst))
 303                         continue;
 304                 if (!knav_queue_match_type(inst, type))
 305                         continue;
 306                 if (knav_queue_is_busy(inst))
 307                         continue;
 308                 qh = __knav_queue_open(inst, name, flags);
 309                 goto unlock_ret;
 310         }
 311
 312 unlock_ret:
 313         mutex_unlock(&knav_dev_lock);
 314         return qh;
 315 }
 316
 317 static void knav_queue_set_notify(struct knav_queue_inst *inst, bool enabled)
 318 {
 319         struct knav_range_info *range = inst->range;
 320
 321         if (range->ops && range->ops->set_notify)
 322                 range->ops->set_notify(range, inst, enabled);
 323 }
 324
 325 static int knav_queue_enable_notifier(struct knav_queue *qh)
 326 {
 327         struct knav_queue_inst *inst = qh->inst;
 328         bool first;
 329
 330         if (WARN_ON(!qh->notifier_fn))
 331                 return -EINVAL;
 332
 333         /* Adjust the per handle notifier count */
 334         first = (atomic_inc_return(&qh->notifier_enabled) == 1);
 335         if (!first)
 336                 return 0; /* nothing to do */
 337
 338         /* Now adjust the per instance notifier count */
 339         first = (atomic_inc_return(&inst->num_notifiers) == 1);
 340         if (first)
 341                 knav_queue_set_notify(inst, true);
 342
 343         return 0;
 344 }
 345
 346 static int knav_queue_disable_notifier(struct knav_queue *qh)
 347 {
 348         struct knav_queue_inst *inst = qh->inst;
 349         bool last;
 350
 351         last = (atomic_dec_return(&qh->notifier_enabled) == 0);
 352         if (!last)
 353                 return 0; /* nothing to do */
 354
 355         last = (atomic_dec_return(&inst->num_notifiers) == 0);
 356         if (last)
 357                 knav_queue_set_notify(inst, false);
 358
 359         return 0;
 360 }
 361
 362 static int knav_queue_set_notifier(struct knav_queue *qh,
 363                                 struct knav_queue_notify_config *cfg)
 364 {
 365         knav_queue_notify_fn old_fn = qh->notifier_fn;
 366
 367         if (!cfg)
 368                 return -EINVAL;
 369
 370         if (!(qh->inst->range->flags & (RANGE_HAS_ACCUMULATOR | RANGE_HAS_IRQ)))
 371                 return -ENOTSUPP;
 372
 373         if (!cfg->fn && old_fn)
 374                 knav_queue_disable_notifier(qh);
 375
 376         qh->notifier_fn = cfg->fn;
 377         qh->notifier_fn_arg = cfg->fn_arg;
 378
 379         if (cfg->fn && !old_fn)
 380                 knav_queue_enable_notifier(qh);
 381
 382         return 0;
 383 }
 384
 385 static int knav_gp_set_notify(struct knav_range_info *range,
 386                                struct knav_queue_inst *inst,
 387                                bool enabled)
 388 {
 389         unsigned queue;
 390
 391         if (range->flags & RANGE_HAS_IRQ) {
 392                 queue = inst->id - range->queue_base;
 393                 if (enabled)
 394                         enable_irq(range->irqs[queue].irq);
 395                 else
 396                         disable_irq_nosync(range->irqs[queue].irq);
 397         }
 398         return 0;
 399 }
 400
 401 static int knav_gp_open_queue(struct knav_range_info *range,
 402                                 struct knav_queue_inst *inst, unsigned flags)
 403 {
 404         return knav_queue_setup_irq(range, inst);
 405 }
 406
 407 static int knav_gp_close_queue(struct knav_range_info *range,
 408                                 struct knav_queue_inst *inst)
 409 {
 410         knav_queue_free_irq(inst);
 411         return 0;
 412 }
 413
 414 static const struct knav_range_ops knav_gp_range_ops = {
 415         .set_notify     = knav_gp_set_notify,
 416         .open_queue     = knav_gp_open_queue,
 417         .close_queue    = knav_gp_close_queue,
 418 };
 419
 420
 421 static int knav_queue_get_count(void *qhandle)
 422 {
 423         struct knav_queue *qh = qhandle;
 424         struct knav_queue_inst *inst = qh->inst;
 425
 426         return readl_relaxed(&qh->reg_peek[0].entry_count) +
 427                 atomic_read(&inst->desc_count);
 428 }
 429
 430 static void knav_queue_debug_show_instance(struct seq_file *s,
 431                                         struct knav_queue_inst *inst)
 432 {
 433         struct knav_device *kdev = inst->kdev;
 434         struct knav_queue *qh;
 435         int cpu = 0;
 436         int pushes = 0;
 437         int pops = 0;
 438         int push_errors = 0;
 439         int pop_errors = 0;
 440         int notifies = 0;
 441
 442         if (!knav_queue_is_busy(inst))
 443                 return;
 444
 445         seq_printf(s, "\tqueue id %d (%s)\n",
 446                    kdev->base_id + inst->id, inst->name);
 447         for_each_handle_rcu(qh, inst) {
 448                 for_each_possible_cpu(cpu) {
 449                         pushes += per_cpu_ptr(qh->stats, cpu)->pushes;
 450                         pops += per_cpu_ptr(qh->stats, cpu)->pops;
 451                         push_errors += per_cpu_ptr(qh->stats, cpu)->push_errors;
 452                         pop_errors += per_cpu_ptr(qh->stats, cpu)->pop_errors;
 453                         notifies += per_cpu_ptr(qh->stats, cpu)->notifies;
 454                 }
 455
 456                 seq_printf(s, "\t\thandle %p: pushes %8d, pops %8d, count %8d, notifies %8d, push errors %8d, pop errors %8d\n",
 457                                 qh,
 458                                 pushes,
 459                                 pops,
 460                                 knav_queue_get_count(qh),
 461                                 notifies,
 462                                 push_errors,
 463                                 pop_errors);
 464         }
 465 }
 466
 467 static int knav_queue_debug_show(struct seq_file *s, void *v)
 468 {
 469         struct knav_queue_inst *inst;
 470         int idx;
 471
 472         mutex_lock(&knav_dev_lock);
 473         seq_printf(s, "%s: %u-%u\n",
 474                    dev_name(kdev->dev), kdev->base_id,
 475                    kdev->base_id + kdev->num_queues - 1);
 476         for_each_instance(idx, inst, kdev)
 477                 knav_queue_debug_show_instance(s, inst);
 478         mutex_unlock(&knav_dev_lock);
 479
 480         return 0;
 481 }
 482
 483 DEFINE_SHOW_ATTRIBUTE(knav_queue_debug);
 484
 485 static inline int knav_queue_pdsp_wait(u32 * __iomem addr, unsigned timeout,
 486                                         u32 flags)
 487 {
 488         unsigned long end;
 489         u32 val = 0;
 490
 491         end = jiffies + msecs_to_jiffies(timeout);
 492         while (time_after(end, jiffies)) {
 493                 val = readl_relaxed(addr);
 494                 if (flags)
 495                         val &= flags;
 496                 if (!val)
 497                         break;
 498                 cpu_relax();
 499         }
 500         return val ? -ETIMEDOUT : 0;
 501 }
 502
 503
 504 static int knav_queue_flush(struct knav_queue *qh)
 505 {
 506         struct knav_queue_inst *inst = qh->inst;
 507         unsigned id = inst->id - inst->qmgr->start_queue;
 508
 509         atomic_set(&inst->desc_count, 0);
 510         writel_relaxed(0, &inst->qmgr->reg_push[id].ptr_size_thresh);
 511         return 0;
 512 }
 513
 514 /**
 515  * knav_queue_open()    - open a hardware queue
 516  * @name:               - name to give the queue handle
 517  * @id:                 - desired queue number if any or specifes the type
 518  *                        of queue
 519  * @flags:              - the following flags are applicable to queues:
 520  *      KNAV_QUEUE_SHARED - allow the queue to be shared. Queues are
 521  *                           exclusive by default.
 522  *                           Subsequent attempts to open a shared queue should
 523  *                           also have this flag.
 524  *
 525  * Returns a handle to the open hardware queue if successful. Use IS_ERR()
 526  * to check the returned value for error codes.
 527  */
 528 void *knav_queue_open(const char *name, unsigned id,
 529                                         unsigned flags)
 530 {
 531         struct knav_queue *qh = ERR_PTR(-EINVAL);
 532
 533         switch (id) {
 534         case KNAV_QUEUE_QPEND:
 535         case KNAV_QUEUE_ACC:
 536         case KNAV_QUEUE_GP:
 537                 qh = knav_queue_open_by_type(name, id, flags);
 538                 break;
 539
 540         default:
 541                 qh = knav_queue_open_by_id(name, id, flags);
 542                 break;
 543         }
 544         return qh;
 545 }
 546 EXPORT_SYMBOL_GPL(knav_queue_open);
 547
 548 /**
 549  * knav_queue_close()   - close a hardware queue handle
 550  * @qhandle:            - handle to close
 551  */
 552 void knav_queue_close(void *qhandle)
 553 {
 554         struct knav_queue *qh = qhandle;
 555         struct knav_queue_inst *inst = qh->inst;
 556
 557         while (atomic_read(&qh->notifier_enabled) > 0)
 558                 knav_queue_disable_notifier(qh);
 559
 560         mutex_lock(&knav_dev_lock);
 561         list_del_rcu(&qh->list);
 562         mutex_unlock(&knav_dev_lock);
 563         synchronize_rcu();
 564         if (!knav_queue_is_busy(inst)) {
 565                 struct knav_range_info *range = inst->range;
 566
 567                 if (range->ops && range->ops->close_queue)
 568                         range->ops->close_queue(range, inst);
 569         }
 570         free_percpu(qh->stats);
 571         devm_kfree(inst->kdev->dev, qh);
 572 }
 573 EXPORT_SYMBOL_GPL(knav_queue_close);
 574
 575 /**
 576  * knav_queue_device_control()  - Perform control operations on a queue
 577  * @qhandle:                    - queue handle
 578  * @cmd:                        - control commands
 579  * @arg:                        - command argument
 580  *
 581  * Returns 0 on success, errno otherwise.
 582  */
 583 int knav_queue_device_control(void *qhandle, enum knav_queue_ctrl_cmd cmd,
 584                                 unsigned long arg)
 585 {
 586         struct knav_queue *qh = qhandle;
 587         struct knav_queue_notify_config *cfg;
 588         int ret;
 589
 590         switch ((int)cmd) {
 591         case KNAV_QUEUE_GET_ID:
 592                 ret = qh->inst->kdev->base_id + qh->inst->id;
 593                 break;
 594
 595         case KNAV_QUEUE_FLUSH:
 596                 ret = knav_queue_flush(qh);
 597                 break;
 598
 599         case KNAV_QUEUE_SET_NOTIFIER:
 600                 cfg = (void *)arg;
 601                 ret = knav_queue_set_notifier(qh, cfg);
 602                 break;
 603
 604         case KNAV_QUEUE_ENABLE_NOTIFY:
 605                 ret = knav_queue_enable_notifier(qh);
 606                 break;
 607
 608         case KNAV_QUEUE_DISABLE_NOTIFY:
 609                 ret = knav_queue_disable_notifier(qh);
 610                 break;
 611
 612         case KNAV_QUEUE_GET_COUNT:
 613                 ret = knav_queue_get_count(qh);
 614                 break;
 615
 616         default:
 617                 ret = -ENOTSUPP;
 618                 break;
 619         }
 620         return ret;
 621 }
 622 EXPORT_SYMBOL_GPL(knav_queue_device_control);
 623
 624
 625
 626 /**
 627  * knav_queue_push()    - push data (or descriptor) to the tail of a queue
 628  * @qhandle:            - hardware queue handle
 629  * @dma:                - DMA data to push
 630  * @size:               - size of data to push
 631  * @flags:              - can be used to pass additional information
 632  *
 633  * Returns 0 on success, errno otherwise.
 634  */
 635 int knav_queue_push(void *qhandle, dma_addr_t dma,
 636                                         unsigned size, unsigned flags)
 637 {
 638         struct knav_queue *qh = qhandle;
 639         u32 val;
 640
 641         val = (u32)dma | ((size / 16) - 1);
 642         writel_relaxed(val, &qh->reg_push[0].ptr_size_thresh);
 643
 644         this_cpu_inc(qh->stats->pushes);
 645         return 0;
 646 }
 647 EXPORT_SYMBOL_GPL(knav_queue_push);
 648
 649 /**
 650  * knav_queue_pop()     - pop data (or descriptor) from the head of a queue
 651  * @qhandle:            - hardware queue handle
 652  * @size:               - (optional) size of the data pop'ed.
 653  *
 654  * Returns a DMA address on success, 0 on failure.
 655  */
 656 dma_addr_t knav_queue_pop(void *qhandle, unsigned *size)
 657 {
 658         struct knav_queue *qh = qhandle;
 659         struct knav_queue_inst *inst = qh->inst;
 660         dma_addr_t dma;
 661         u32 val, idx;
 662
 663         /* are we accumulated? */
 664         if (inst->descs) {
 665                 if (unlikely(atomic_dec_return(&inst->desc_count) < 0)) {
 666                         atomic_inc(&inst->desc_count);
 667                         return 0;
 668                 }
 669                 idx  = atomic_inc_return(&inst->desc_head);
 670                 idx &= ACC_DESCS_MASK;
 671                 val = inst->descs[idx];
 672         } else {
 673                 val = readl_relaxed(&qh->reg_pop[0].ptr_size_thresh);
 674                 if (unlikely(!val))
 675                         return 0;
 676         }
 677
 678         dma = val & DESC_PTR_MASK;
 679         if (size)
 680                 *size = ((val & DESC_SIZE_MASK) + 1) * 16;
 681
 682         this_cpu_inc(qh->stats->pops);
 683         return dma;
 684 }
 685 EXPORT_SYMBOL_GPL(knav_queue_pop);
 686
 687 /* carve out descriptors and push into queue */
 688 static void kdesc_fill_pool(struct knav_pool *pool)
 689 {
 690         struct knav_region *region;
 691         int i;
 692
 693         region = pool->region;
 694         pool->desc_size = region->desc_size;
 695         for (i = 0; i < pool->num_desc; i++) {
 696                 int index = pool->region_offset + i;
 697                 dma_addr_t dma_addr;
 698                 unsigned dma_size;
 699                 dma_addr = region->dma_start + (region->desc_size * index);
 700                 dma_size = ALIGN(pool->desc_size, SMP_CACHE_BYTES);
 701                 dma_sync_single_for_device(pool->dev, dma_addr, dma_size,
 702                                            DMA_TO_DEVICE);
 703                 knav_queue_push(pool->queue, dma_addr, dma_size, 0);
 704         }
 705 }
 706
 707 /* pop out descriptors and close the queue */
 708 static void kdesc_empty_pool(struct knav_pool *pool)
 709 {
 710         dma_addr_t dma;
 711         unsigned size;
 712         void *desc;
 713         int i;
 714
 715         if (!pool->queue)
 716                 return;
 717
 718         for (i = 0;; i++) {
 719                 dma = knav_queue_pop(pool->queue, &size);
 720                 if (!dma)
 721                         break;
 722                 desc = knav_pool_desc_dma_to_virt(pool, dma);
 723                 if (!desc) {
 724                         dev_dbg(pool->kdev->dev,
 725                                 "couldn't unmap desc, continuing\n");
 726                         continue;
 727                 }
 728         }
 729         WARN_ON(i != pool->num_desc);
 730         knav_queue_close(pool->queue);
 731 }
 732
 733
 734 /* Get the DMA address of a descriptor */
 735 dma_addr_t knav_pool_desc_virt_to_dma(void *ph, void *virt)
 736 {
 737         struct knav_pool *pool = ph;
 738         return pool->region->dma_start + (virt - pool->region->virt_start);
 739 }
 740 EXPORT_SYMBOL_GPL(knav_pool_desc_virt_to_dma);
 741
 742 void *knav_pool_desc_dma_to_virt(void *ph, dma_addr_t dma)
 743 {
 744         struct knav_pool *pool = ph;
 745         return pool->region->virt_start + (dma - pool->region->dma_start);
 746 }
 747 EXPORT_SYMBOL_GPL(knav_pool_desc_dma_to_virt);
 748
 749 /**
 750  * knav_pool_create()   - Create a pool of descriptors
 751  * @name:               - name to give the pool handle
 752  * @num_desc:           - numbers of descriptors in the pool
 753  * @region_id:          - QMSS region id from which the descriptors are to be
 754  *                        allocated.
 755  *
 756  * Returns a pool handle on success.
 757  * Use IS_ERR_OR_NULL() to identify error values on return.
 758  */
 759 void *knav_pool_create(const char *name,
 760                                         int num_desc, int region_id)
 761 {
 762         struct knav_region *reg_itr, *region = NULL;
 763         struct knav_pool *pool, *pi = NULL, *iter;
 764         struct list_head *node;
 765         unsigned last_offset;
 766         int ret;
 767
 768         if (!kdev)
 769                 return ERR_PTR(-EPROBE_DEFER);
 770
 771         if (!kdev->dev)
 772                 return ERR_PTR(-ENODEV);
 773
 774         pool = devm_kzalloc(kdev->dev, sizeof(*pool), GFP_KERNEL);
 775         if (!pool) {
 776                 dev_err(kdev->dev, "out of memory allocating pool\n");
 777                 return ERR_PTR(-ENOMEM);
 778         }
 779
 780         for_each_region(kdev, reg_itr) {
 781                 if (reg_itr->id != region_id)
 782                         continue;
 783                 region = reg_itr;
 784                 break;
 785         }
 786
 787         if (!region) {
 788                 dev_err(kdev->dev, "region-id(%d) not found\n", region_id);
 789                 ret = -EINVAL;
 790                 goto err;
 791         }
 792
 793         pool->queue = knav_queue_open(name, KNAV_QUEUE_GP, 0);
 794         if (IS_ERR(pool->queue)) {
 795                 dev_err(kdev->dev,
 796                         "failed to open queue for pool(%s), error %ld\n",
 797                         name, PTR_ERR(pool->queue));
 798                 ret = PTR_ERR(pool->queue);
 799                 goto err;
 800         }
 801
 802         pool->name = kstrndup(name, KNAV_NAME_SIZE - 1, GFP_KERNEL);
 803         pool->kdev = kdev;
 804         pool->dev = kdev->dev;
 805
 806         mutex_lock(&knav_dev_lock);
 807
 808         if (num_desc > (region->num_desc - region->used_desc)) {
 809                 dev_err(kdev->dev, "out of descs in region(%d) for pool(%s)\n",
 810                         region_id, name);
 811                 ret = -ENOMEM;
 812                 goto err_unlock;
 813         }
 814
 815         /* Region maintains a sorted (by region offset) list of pools
 816          * use the first free slot which is large enough to accomodate
 817          * the request
 818          */
 819         last_offset = 0;
 820         node = &region->pools;
 821         list_for_each_entry(iter, &region->pools, region_inst) {
 822                 if ((iter->region_offset - last_offset) >= num_desc) {
 823                         pi = iter;
 824                         break;
 825                 }
 826                 last_offset = iter->region_offset + iter->num_desc;
 827         }
 828
 829         if (pi) {
 830                 node = &pi->region_inst;
 831                 pool->region = region;
 832                 pool->num_desc = num_desc;
 833                 pool->region_offset = last_offset;
 834                 region->used_desc += num_desc;
 835                 list_add_tail(&pool->list, &kdev->pools);
 836                 list_add_tail(&pool->region_inst, node);
 837         } else {
 838                 dev_err(kdev->dev, "pool(%s) create failed: fragmented desc pool in region(%d)\n",
 839                         name, region_id);
 840                 ret = -ENOMEM;
 841                 goto err_unlock;
 842         }
 843
 844         mutex_unlock(&knav_dev_lock);
 845         kdesc_fill_pool(pool);
 846         return pool;
 847
 848 err_unlock:
 849         mutex_unlock(&knav_dev_lock);
 850 err:
 851         kfree(pool->name);
 852         devm_kfree(kdev->dev, pool);
 853         return ERR_PTR(ret);
 854 }
 855 EXPORT_SYMBOL_GPL(knav_pool_create);
 856
 857 /**
 858  * knav_pool_destroy()  - Free a pool of descriptors
 859  * @ph:         - pool handle
 860  */
 861 void knav_pool_destroy(void *ph)
 862 {
 863         struct knav_pool *pool = ph;
 864
 865         if (!pool)
 866                 return;
 867
 868         if (!pool->region)
 869                 return;
 870
 871         kdesc_empty_pool(pool);
 872         mutex_lock(&knav_dev_lock);
 873
 874         pool->region->used_desc -= pool->num_desc;
 875         list_del(&pool->region_inst);
 876         list_del(&pool->list);
 877
 878         mutex_unlock(&knav_dev_lock);
 879         kfree(pool->name);
 880         devm_kfree(kdev->dev, pool);
 881 }
 882 EXPORT_SYMBOL_GPL(knav_pool_destroy);
 883
 884
 885 /**
 886  * knav_pool_desc_get() - Get a descriptor from the pool
 887  * @ph:         - pool handle
 888  *
 889  * Returns descriptor from the pool.
 890  */
 891 void *knav_pool_desc_get(void *ph)
 892 {
 893         struct knav_pool *pool = ph;
 894         dma_addr_t dma;
 895         unsigned size;
 896         void *data;
 897
 898         dma = knav_queue_pop(pool->queue, &size);
 899         if (unlikely(!dma))
 900                 return ERR_PTR(-ENOMEM);
 901         data = knav_pool_desc_dma_to_virt(pool, dma);
 902         return data;
 903 }
 904 EXPORT_SYMBOL_GPL(knav_pool_desc_get);
 905
 906 /**
 907  * knav_pool_desc_put() - return a descriptor to the pool
 908  * @ph:         - pool handle
 909  * @desc:       - virtual address
 910  */
 911 void knav_pool_desc_put(void *ph, void *desc)
 912 {
 913         struct knav_pool *pool = ph;
 914         dma_addr_t dma;
 915         dma = knav_pool_desc_virt_to_dma(pool, desc);
 916         knav_queue_push(pool->queue, dma, pool->region->desc_size, 0);
 917 }
 918 EXPORT_SYMBOL_GPL(knav_pool_desc_put);
 919
 920 /**
 921  * knav_pool_desc_map() - Map descriptor for DMA transfer
 922  * @ph:                         - pool handle
 923  * @desc:                       - address of descriptor to map
 924  * @size:                       - size of descriptor to map
 925  * @dma:                        - DMA address return pointer
 926  * @dma_sz:                     - adjusted return pointer
 927  *
 928  * Returns 0 on success, errno otherwise.
 929  */
 930 int knav_pool_desc_map(void *ph, void *desc, unsigned size,
 931                                         dma_addr_t *dma, unsigned *dma_sz)
 932 {
 933         struct knav_pool *pool = ph;
 934         *dma = knav_pool_desc_virt_to_dma(pool, desc);
 935         size = min(size, pool->region->desc_size);
 936         size = ALIGN(size, SMP_CACHE_BYTES);
 937         *dma_sz = size;
 938         dma_sync_single_for_device(pool->dev, *dma, size, DMA_TO_DEVICE);
 939
 940         /* Ensure the descriptor reaches to the memory */
 941         __iowmb();
 942
 943         return 0;
 944 }
 945 EXPORT_SYMBOL_GPL(knav_pool_desc_map);
 946
 947 /**
 948  * knav_pool_desc_unmap()       - Unmap descriptor after DMA transfer
 949  * @ph:                         - pool handle
 950  * @dma:                        - DMA address of descriptor to unmap
 951  * @dma_sz:                     - size of descriptor to unmap
 952  *
 953  * Returns descriptor address on success, Use IS_ERR_OR_NULL() to identify
 954  * error values on return.
 955  */
 956 void *knav_pool_desc_unmap(void *ph, dma_addr_t dma, unsigned dma_sz)
 957 {
 958         struct knav_pool *pool = ph;
 959         unsigned desc_sz;
 960         void *desc;
 961
 962         desc_sz = min(dma_sz, pool->region->desc_size);
 963         desc = knav_pool_desc_dma_to_virt(pool, dma);
 964         dma_sync_single_for_cpu(pool->dev, dma, desc_sz, DMA_FROM_DEVICE);
 965         prefetch(desc);
 966         return desc;
 967 }
 968 EXPORT_SYMBOL_GPL(knav_pool_desc_unmap);
 969
 970 /**
 971  * knav_pool_count()    - Get the number of descriptors in pool.
 972  * @ph:                 - pool handle
 973  * Returns number of elements in the pool.
 974  */
 975 int knav_pool_count(void *ph)
 976 {
 977         struct knav_pool *pool = ph;
 978         return knav_queue_get_count(pool->queue);
 979 }
 980 EXPORT_SYMBOL_GPL(knav_pool_count);
 981
 982 static void knav_queue_setup_region(struct knav_device *kdev,
 983                                         struct knav_region *region)
 984 {
 985         unsigned hw_num_desc, hw_desc_size, size;
 986         struct knav_reg_region __iomem  *regs;
 987         struct knav_qmgr_info *qmgr;
 988         struct knav_pool *pool;
 989         int id = region->id;
 990         struct page *page;
 991
 992         /* unused region? */
 993         if (!region->num_desc) {
 994                 dev_warn(kdev->dev, "unused region %s\n", region->name);
 995                 return;
 996         }
 997
 998         /* get hardware descriptor value */
 999         hw_num_desc = ilog2(region->num_desc - 1) + 1;
1000
1001         /* did we force fit ourselves into nothingness? */
1002         if (region->num_desc < 32) {
1003                 region->num_desc = 0;
1004                 dev_warn(kdev->dev, "too few descriptors in region %s\n",
1005                          region->name);
1006                 return;
1007         }
1008
1009         size = region->num_desc * region->desc_size;
1010         region->virt_start = alloc_pages_exact(size, GFP_KERNEL | GFP_DMA |
1011                                                 GFP_DMA32);
1012         if (!region->virt_start) {
1013                 region->num_desc = 0;
1014                 dev_err(kdev->dev, "memory alloc failed for region %s\n",
1015                         region->name);
1016                 return;
1017         }
1018         region->virt_end = region->virt_start + size;
1019         page = virt_to_page(region->virt_start);
1020
1021         region->dma_start = dma_map_page(kdev->dev, page, 0, size,
1022                                          DMA_BIDIRECTIONAL);
1023         if (dma_mapping_error(kdev->dev, region->dma_start)) {
1024                 dev_err(kdev->dev, "dma map failed for region %s\n",
1025                         region->name);
1026                 goto fail;
1027         }
1028         region->dma_end = region->dma_start + size;
1029
1030         pool = devm_kzalloc(kdev->dev, sizeof(*pool), GFP_KERNEL);
1031         if (!pool) {
1032                 dev_err(kdev->dev, "out of memory allocating dummy pool\n");
1033                 goto fail;
1034         }
1035         pool->num_desc = 0;
1036         pool->region_offset = region->num_desc;
1037         list_add(&pool->region_inst, &region->pools);
1038
1039         dev_dbg(kdev->dev,
1040                 "region %s (%d): size:%d, link:%d@%d, dma:%pad-%pad, virt:%p-%p\n",
1041                 region->name, id, region->desc_size, region->num_desc,
1042                 region->link_index, &region->dma_start, &region->dma_end,
1043                 region->virt_start, region->virt_end);
1044
1045         hw_desc_size = (region->desc_size / 16) - 1;
1046         hw_num_desc -= 5;
1047
1048         for_each_qmgr(kdev, qmgr) {
1049                 regs = qmgr->reg_region + id;
1050                 writel_relaxed((u32)region->dma_start, &regs->base);
1051                 writel_relaxed(region->link_index, &regs->start_index);
1052                 writel_relaxed(hw_desc_size << 16 | hw_num_desc,
1053                                &regs->size_count);
1054         }
1055         return;
1056
1057 fail:
1058         if (region->dma_start)
1059                 dma_unmap_page(kdev->dev, region->dma_start, size,
1060                                 DMA_BIDIRECTIONAL);
1061         if (region->virt_start)
1062                 free_pages_exact(region->virt_start, size);
1063         region->num_desc = 0;
1064         return;
1065 }
1066
1067 static const char *knav_queue_find_name(struct device_node *node)
1068 {
1069         const char *name;
1070
1071         if (of_property_read_string(node, "label", &name) < 0)
1072                 name = node->name;
1073         if (!name)
1074                 name = "unknown";
1075         return name;
1076 }
1077
1078 static int knav_queue_setup_regions(struct knav_device *kdev,
1079                                     struct device_node *node)
1080 {
1081         struct device *dev = kdev->dev;
1082         struct device_node *regions __free(device_node) =
1083                         of_get_child_by_name(node, "descriptor-regions");
1084         struct knav_region *region;
1085         struct device_node *child;
1086         u32 temp[2];
1087         int ret;
1088
1089         if (!regions)
1090                 return dev_err_probe(dev, -ENODEV,
1091                                      "descriptor-regions not specified\n");
1092
1093         for_each_child_of_node(regions, child) {
1094                 region = devm_kzalloc(dev, sizeof(*region), GFP_KERNEL);
1095                 if (!region) {
1096                         of_node_put(child);
1097                         dev_err(dev, "out of memory allocating region\n");
1098                         return -ENOMEM;
1099                 }
1100
1101                 region->name = knav_queue_find_name(child);
1102                 of_property_read_u32(child, "id", &region->id);
1103                 ret = of_property_read_u32_array(child, "region-spec", temp, 2);
1104                 if (!ret) {
1105                         region->num_desc  = temp[0];
1106                         region->desc_size = temp[1];
1107                 } else {
1108                         dev_err(dev, "invalid region info %s\n", region->name);
1109                         devm_kfree(dev, region);
1110                         continue;
1111                 }
1112
1113                 ret = of_property_read_u32(child, "link-index",
1114                                            &region->link_index);
1115                 if (ret) {
1116                         dev_err(dev, "link index not found for %s\n",
1117                                 region->name);
1118                         devm_kfree(dev, region);
1119                         continue;
1120                 }
1121
1122                 INIT_LIST_HEAD(&region->pools);
1123                 list_add_tail(&region->list, &kdev->regions);
1124         }
1125         if (list_empty(&kdev->regions))
1126                 return dev_err_probe(dev, -ENODEV,
1127                                      "no valid region information found\n");
1128
1129         /* Next, we run through the regions and set things up */
1130         for_each_region(kdev, region)
1131                 knav_queue_setup_region(kdev, region);
1132
1133         return 0;
1134 }
1135
1136 static int knav_get_link_ram(struct knav_device *kdev,
1137                                        const char *name,
1138                                        struct knav_link_ram_block *block)
1139 {
1140         struct platform_device *pdev = to_platform_device(kdev->dev);
1141         struct device_node *node = pdev->dev.of_node;
1142         u32 temp[2];
1143
1144         /*
1145          * Note: link ram resources are specified in "entry" sized units. In
1146          * reality, although entries are ~40bits in hardware, we treat them as
1147          * 64-bit entities here.
1148          *
1149          * For example, to specify the internal link ram for Keystone-I class
1150          * devices, we would set the linkram0 resource to 0x80000-0x83fff.
1151          *
1152          * This gets a bit weird when other link rams are used.  For example,
1153          * if the range specified is 0x0c000000-0x0c003fff (i.e., 16K entries
1154          * in MSMC SRAM), the actual memory used is 0x0c000000-0x0c020000,
1155          * which accounts for 64-bits per entry, for 16K entries.
1156          */
1157         if (!of_property_read_u32_array(node, name , temp, 2)) {
1158                 if (temp[0]) {
1159                         /*
1160                          * queue_base specified => using internal or onchip
1161                          * link ram WARNING - we do not "reserve" this block
1162                          */
1163                         block->dma = (dma_addr_t)temp[0];
1164                         block->virt = NULL;
1165                         block->size = temp[1];
1166                 } else {
1167                         block->size = temp[1];
1168                         /* queue_base not specific => allocate requested size */
1169                         block->virt = dmam_alloc_coherent(kdev->dev,
1170                                                   8 * block->size, &block->dma,
1171                                                   GFP_KERNEL);
1172                         if (!block->virt) {
1173                                 dev_err(kdev->dev, "failed to alloc linkram\n");
1174                                 return -ENOMEM;
1175                         }
1176                 }
1177         } else {
1178                 return -ENODEV;
1179         }
1180         return 0;
1181 }
1182
1183 static int knav_queue_setup_link_ram(struct knav_device *kdev)
1184 {
1185         struct knav_link_ram_block *block;
1186         struct knav_qmgr_info *qmgr;
1187
1188         for_each_qmgr(kdev, qmgr) {
1189                 block = &kdev->link_rams[0];
1190                 dev_dbg(kdev->dev, "linkram0: dma:%pad, virt:%p, size:%x\n",
1191                         &block->dma, block->virt, block->size);
1192                 writel_relaxed((u32)block->dma, &qmgr->reg_config->link_ram_base0);
1193                 if (kdev->version == QMSS_66AK2G)
1194                         writel_relaxed(block->size,
1195                                        &qmgr->reg_config->link_ram_size0);
1196                 else
1197                         writel_relaxed(block->size - 1,
1198                                        &qmgr->reg_config->link_ram_size0);
1199                 block++;
1200                 if (!block->size)
1201                         continue;
1202
1203                 dev_dbg(kdev->dev, "linkram1: dma:%pad, virt:%p, size:%x\n",
1204                         &block->dma, block->virt, block->size);
1205                 writel_relaxed(block->dma, &qmgr->reg_config->link_ram_base1);
1206         }
1207
1208         return 0;
1209 }
1210
1211 static int knav_setup_queue_range(struct knav_device *kdev,
1212                                         struct device_node *node)
1213 {
1214         struct device *dev = kdev->dev;
1215         struct knav_range_info *range;
1216         struct knav_qmgr_info *qmgr;
1217         u32 temp[2], start, end, id, index;
1218         int ret, i;
1219
1220         range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
1221         if (!range) {
1222                 dev_err(dev, "out of memory allocating range\n");
1223                 return -ENOMEM;
1224         }
1225
1226         range->kdev = kdev;
1227         range->name = knav_queue_find_name(node);
1228         ret = of_property_read_u32_array(node, "qrange", temp, 2);
1229         if (!ret) {
1230                 range->queue_base = temp[0] - kdev->base_id;
1231                 range->num_queues = temp[1];
1232         } else {
1233                 dev_err(dev, "invalid queue range %s\n", range->name);
1234                 devm_kfree(dev, range);
1235                 return -EINVAL;
1236         }
1237
1238         for (i = 0; i < RANGE_MAX_IRQS; i++) {
1239                 struct of_phandle_args oirq;
1240
1241                 if (of_irq_parse_one(node, i, &oirq))
1242                         break;
1243
1244                 range->irqs[i].irq = irq_create_of_mapping(&oirq);
1245                 if (range->irqs[i].irq == IRQ_NONE)
1246                         break;
1247
1248                 range->num_irqs++;
1249
1250                 if (IS_ENABLED(CONFIG_SMP) && oirq.args_count == 3) {
1251                         unsigned long mask;
1252                         int bit;
1253
1254                         range->irqs[i].cpu_mask = devm_kzalloc(dev,
1255                                                                cpumask_size(), GFP_KERNEL);
1256                         if (!range->irqs[i].cpu_mask)
1257                                 return -ENOMEM;
1258
1259                         mask = (oirq.args[2] & 0x0000ff00) >> 8;
1260                         for_each_set_bit(bit, &mask, BITS_PER_LONG)
1261                                 cpumask_set_cpu(bit, range->irqs[i].cpu_mask);
1262                 }
1263         }
1264
1265         range->num_irqs = min(range->num_irqs, range->num_queues);
1266         if (range->num_irqs)
1267                 range->flags |= RANGE_HAS_IRQ;
1268
1269         if (of_property_read_bool(node, "qalloc-by-id"))
1270                 range->flags |= RANGE_RESERVED;
1271
1272         if (of_property_present(node, "accumulator")) {
1273                 ret = knav_init_acc_range(kdev, node, range);
1274                 if (ret < 0) {
1275                         devm_kfree(dev, range);
1276                         return ret;
1277                 }
1278         } else {
1279                 range->ops = &knav_gp_range_ops;
1280         }
1281
1282         /* set threshold to 1, and flush out the queues */
1283         for_each_qmgr(kdev, qmgr) {
1284                 start = max(qmgr->start_queue, range->queue_base);
1285                 end   = min(qmgr->start_queue + qmgr->num_queues,
1286                             range->queue_base + range->num_queues);
1287                 for (id = start; id < end; id++) {
1288                         index = id - qmgr->start_queue;
1289                         writel_relaxed(THRESH_GTE | 1,
1290                                        &qmgr->reg_peek[index].ptr_size_thresh);
1291                         writel_relaxed(0,
1292                                        &qmgr->reg_push[index].ptr_size_thresh);
1293                 }
1294         }
1295
1296         list_add_tail(&range->list, &kdev->queue_ranges);
1297         dev_dbg(dev, "added range %s: %d-%d, %d irqs%s%s%s\n",
1298                 range->name, range->queue_base,
1299                 range->queue_base + range->num_queues - 1,
1300                 range->num_irqs,
1301                 (range->flags & RANGE_HAS_IRQ) ? ", has irq" : "",
1302                 (range->flags & RANGE_RESERVED) ? ", reserved" : "",
1303                 (range->flags & RANGE_HAS_ACCUMULATOR) ? ", acc" : "");
1304         kdev->num_queues_in_use += range->num_queues;
1305         return 0;
1306 }
1307
1308 static int knav_setup_queue_pools(struct knav_device *kdev,
1309                                   struct device_node *node)
1310 {
1311         struct device_node *queue_pools __free(device_node) =
1312                         of_get_child_by_name(node, "queue-pools");
1313         struct device_node *type, *range;
1314
1315         if (!queue_pools)
1316                 return dev_err_probe(kdev->dev, -ENODEV,
1317                                      "queue-pools not specified\n");
1318
1319         for_each_child_of_node(queue_pools, type) {
1320                 for_each_child_of_node(type, range) {
1321                         /* return value ignored, we init the rest... */
1322                         knav_setup_queue_range(kdev, range);
1323                 }
1324         }
1325
1326         /* ... and barf if they all failed! */
1327         if (list_empty(&kdev->queue_ranges))
1328                 return dev_err_probe(kdev->dev, -ENODEV,
1329                                      "no valid queue range found\n");
1330         return 0;
1331 }
1332
1333 static void knav_free_queue_range(struct knav_device *kdev,
1334                                   struct knav_range_info *range)
1335 {
1336         if (range->ops && range->ops->free_range)
1337                 range->ops->free_range(range);
1338         list_del(&range->list);
1339         devm_kfree(kdev->dev, range);
1340 }
1341
1342 static void knav_free_queue_ranges(struct knav_device *kdev)
1343 {
1344         struct knav_range_info *range;
1345
1346         for (;;) {
1347                 range = first_queue_range(kdev);
1348                 if (!range)
1349                         break;
1350                 knav_free_queue_range(kdev, range);
1351         }
1352 }
1353
1354 static void knav_queue_free_regions(struct knav_device *kdev)
1355 {
1356         struct knav_region *region;
1357         struct knav_pool *pool, *tmp;
1358         unsigned size;
1359
1360         for (;;) {
1361                 region = first_region(kdev);
1362                 if (!region)
1363                         break;
1364                 list_for_each_entry_safe(pool, tmp, &region->pools, region_inst)
1365                         knav_pool_destroy(pool);
1366
1367                 size = region->virt_end - region->virt_start;
1368                 if (size)
1369                         free_pages_exact(region->virt_start, size);
1370                 list_del(&region->list);
1371                 devm_kfree(kdev->dev, region);
1372         }
1373 }
1374
1375 static void __iomem *knav_queue_map_reg(struct knav_device *kdev,
1376                                         struct device_node *node, int index)
1377 {
1378         struct resource res;
1379         void __iomem *regs;
1380         int ret;
1381
1382         ret = of_address_to_resource(node, index, &res);
1383         if (ret) {
1384                 dev_err(kdev->dev, "Can't translate of node(%pOFn) address for index(%d)\n",
1385                         node, index);
1386                 return ERR_PTR(ret);
1387         }
1388
1389         regs = devm_ioremap_resource(kdev->dev, &res);
1390         if (IS_ERR(regs))
1391                 dev_err(kdev->dev, "Failed to map register base for index(%d) node(%pOFn)\n",
1392                         index, node);
1393         return regs;
1394 }
1395
1396 static int knav_queue_init_qmgrs(struct knav_device *kdev,
1397                                  struct device_node *node)
1398 {
1399         struct device *dev = kdev->dev;
1400         struct device_node *qmgrs __free(device_node) =
1401                         of_get_child_by_name(node, "qmgrs");
1402         struct knav_qmgr_info *qmgr;
1403         struct device_node *child;
1404         u32 temp[2];
1405         int ret;
1406
1407         if (!qmgrs)
1408                 return dev_err_probe(dev, -ENODEV,
1409                                      "queue manager info not specified\n");
1410
1411         for_each_child_of_node(qmgrs, child) {
1412                 qmgr = devm_kzalloc(dev, sizeof(*qmgr), GFP_KERNEL);
1413                 if (!qmgr) {
1414                         of_node_put(child);
1415                         dev_err(dev, "out of memory allocating qmgr\n");
1416                         return -ENOMEM;
1417                 }
1418
1419                 ret = of_property_read_u32_array(child, "managed-queues",
1420                                                  temp, 2);
1421                 if (!ret) {
1422                         qmgr->start_queue = temp[0];
1423                         qmgr->num_queues = temp[1];
1424                 } else {
1425                         dev_err(dev, "invalid qmgr queue range\n");
1426                         devm_kfree(dev, qmgr);
1427                         continue;
1428                 }
1429
1430                 dev_info(dev, "qmgr start queue %d, number of queues %d\n",
1431                          qmgr->start_queue, qmgr->num_queues);
1432
1433                 qmgr->reg_peek =
1434                         knav_queue_map_reg(kdev, child,
1435                                            KNAV_QUEUE_PEEK_REG_INDEX);
1436
1437                 if (kdev->version == QMSS) {
1438                         qmgr->reg_status =
1439                                 knav_queue_map_reg(kdev, child,
1440                                                    KNAV_QUEUE_STATUS_REG_INDEX);
1441                 }
1442
1443                 qmgr->reg_config =
1444                         knav_queue_map_reg(kdev, child,
1445                                            (kdev->version == QMSS_66AK2G) ?
1446                                            KNAV_L_QUEUE_CONFIG_REG_INDEX :
1447                                            KNAV_QUEUE_CONFIG_REG_INDEX);
1448                 qmgr->reg_region =
1449                         knav_queue_map_reg(kdev, child,
1450                                            (kdev->version == QMSS_66AK2G) ?
1451                                            KNAV_L_QUEUE_REGION_REG_INDEX :
1452                                            KNAV_QUEUE_REGION_REG_INDEX);
1453
1454                 qmgr->reg_push =
1455                         knav_queue_map_reg(kdev, child,
1456                                            (kdev->version == QMSS_66AK2G) ?
1457                                             KNAV_L_QUEUE_PUSH_REG_INDEX :
1458                                             KNAV_QUEUE_PUSH_REG_INDEX);
1459
1460                 if (kdev->version == QMSS) {
1461                         qmgr->reg_pop =
1462                                 knav_queue_map_reg(kdev, child,
1463                                                    KNAV_QUEUE_POP_REG_INDEX);
1464                 }
1465
1466                 if (IS_ERR(qmgr->reg_peek) ||
1467                     ((kdev->version == QMSS) &&
1468                     (IS_ERR(qmgr->reg_status) || IS_ERR(qmgr->reg_pop))) ||
1469                     IS_ERR(qmgr->reg_config) || IS_ERR(qmgr->reg_region) ||
1470                     IS_ERR(qmgr->reg_push)) {
1471                         dev_err(dev, "failed to map qmgr regs\n");
1472                         if (kdev->version == QMSS) {
1473                                 if (!IS_ERR(qmgr->reg_status))
1474                                         devm_iounmap(dev, qmgr->reg_status);
1475                                 if (!IS_ERR(qmgr->reg_pop))
1476                                         devm_iounmap(dev, qmgr->reg_pop);
1477                         }
1478                         if (!IS_ERR(qmgr->reg_peek))
1479                                 devm_iounmap(dev, qmgr->reg_peek);
1480                         if (!IS_ERR(qmgr->reg_config))
1481                                 devm_iounmap(dev, qmgr->reg_config);
1482                         if (!IS_ERR(qmgr->reg_region))
1483                                 devm_iounmap(dev, qmgr->reg_region);
1484                         if (!IS_ERR(qmgr->reg_push))
1485                                 devm_iounmap(dev, qmgr->reg_push);
1486                         devm_kfree(dev, qmgr);
1487                         continue;
1488                 }
1489
1490                 /* Use same push register for pop as well */
1491                 if (kdev->version == QMSS_66AK2G)
1492                         qmgr->reg_pop = qmgr->reg_push;
1493
1494                 list_add_tail(&qmgr->list, &kdev->qmgrs);
1495                 dev_info(dev, "added qmgr start queue %d, num of queues %d, reg_peek %p, reg_status %p, reg_config %p, reg_region %p, reg_push %p, reg_pop %p\n",
1496                          qmgr->start_queue, qmgr->num_queues,
1497                          qmgr->reg_peek, qmgr->reg_status,
1498                          qmgr->reg_config, qmgr->reg_region,
1499                          qmgr->reg_push, qmgr->reg_pop);
1500         }
1501         return 0;
1502 }
1503
1504 static int knav_queue_init_pdsps(struct knav_device *kdev,
1505                                         struct device_node *pdsps)
1506 {
1507         struct device *dev = kdev->dev;
1508         struct knav_pdsp_info *pdsp;
1509         struct device_node *child;
1510
1511         for_each_child_of_node(pdsps, child) {
1512                 pdsp = devm_kzalloc(dev, sizeof(*pdsp), GFP_KERNEL);
1513                 if (!pdsp) {
1514                         of_node_put(child);
1515                         dev_err(dev, "out of memory allocating pdsp\n");
1516                         return -ENOMEM;
1517                 }
1518                 pdsp->name = knav_queue_find_name(child);
1519                 pdsp->iram =
1520                         knav_queue_map_reg(kdev, child,
1521                                            KNAV_QUEUE_PDSP_IRAM_REG_INDEX);
1522                 pdsp->regs =
1523                         knav_queue_map_reg(kdev, child,
1524                                            KNAV_QUEUE_PDSP_REGS_REG_INDEX);
1525                 pdsp->intd =
1526                         knav_queue_map_reg(kdev, child,
1527                                            KNAV_QUEUE_PDSP_INTD_REG_INDEX);
1528                 pdsp->command =
1529                         knav_queue_map_reg(kdev, child,
1530                                            KNAV_QUEUE_PDSP_CMD_REG_INDEX);
1531
1532                 if (IS_ERR(pdsp->command) || IS_ERR(pdsp->iram) ||
1533                     IS_ERR(pdsp->regs) || IS_ERR(pdsp->intd)) {
1534                         dev_err(dev, "failed to map pdsp %s regs\n",
1535                                 pdsp->name);
1536                         if (!IS_ERR(pdsp->command))
1537                                 devm_iounmap(dev, pdsp->command);
1538                         if (!IS_ERR(pdsp->iram))
1539                                 devm_iounmap(dev, pdsp->iram);
1540                         if (!IS_ERR(pdsp->regs))
1541                                 devm_iounmap(dev, pdsp->regs);
1542                         if (!IS_ERR(pdsp->intd))
1543                                 devm_iounmap(dev, pdsp->intd);
1544                         devm_kfree(dev, pdsp);
1545                         continue;
1546                 }
1547                 of_property_read_u32(child, "id", &pdsp->id);
1548                 list_add_tail(&pdsp->list, &kdev->pdsps);
1549                 dev_dbg(dev, "added pdsp %s: command %p, iram %p, regs %p, intd %p\n",
1550                         pdsp->name, pdsp->command, pdsp->iram, pdsp->regs,
1551                         pdsp->intd);
1552         }
1553         return 0;
1554 }
1555
1556 static int knav_queue_stop_pdsp(struct knav_device *kdev,
1557                           struct knav_pdsp_info *pdsp)
1558 {
1559         u32 val, timeout = 1000;
1560         int ret;
1561
1562         val = readl_relaxed(&pdsp->regs->control) & ~PDSP_CTRL_ENABLE;
1563         writel_relaxed(val, &pdsp->regs->control);
1564         ret = knav_queue_pdsp_wait(&pdsp->regs->control, timeout,
1565                                         PDSP_CTRL_RUNNING);
1566         if (ret < 0) {
1567                 dev_err(kdev->dev, "timed out on pdsp %s stop\n", pdsp->name);
1568                 return ret;
1569         }
1570         pdsp->loaded = false;
1571         pdsp->started = false;
1572         return 0;
1573 }
1574
1575 static int knav_queue_load_pdsp(struct knav_device *kdev,
1576                           struct knav_pdsp_info *pdsp)
1577 {
1578         int i, ret, fwlen;
1579         const struct firmware *fw;
1580         bool found = false;
1581         u32 *fwdata;
1582
1583         for (i = 0; i < ARRAY_SIZE(knav_acc_firmwares); i++) {
1584                 if (knav_acc_firmwares[i]) {
1585                         ret = request_firmware_direct(&fw,
1586                                                       knav_acc_firmwares[i],
1587                                                       kdev->dev);
1588                         if (!ret) {
1589                                 found = true;
1590                                 break;
1591                         }
1592                 }
1593         }
1594
1595         if (!found) {
1596                 dev_err(kdev->dev, "failed to get firmware for pdsp\n");
1597                 return -ENODEV;
1598         }
1599
1600         dev_info(kdev->dev, "firmware file %s downloaded for PDSP\n",
1601                  knav_acc_firmwares[i]);
1602
1603         writel_relaxed(pdsp->id + 1, pdsp->command + 0x18);
1604         /* download the firmware */
1605         fwdata = (u32 *)fw->data;
1606         fwlen = (fw->size + sizeof(u32) - 1) / sizeof(u32);
1607         for (i = 0; i < fwlen; i++)
1608                 writel_relaxed(be32_to_cpu(fwdata[i]), pdsp->iram + i);
1609
1610         release_firmware(fw);
1611         return 0;
1612 }
1613
1614 static int knav_queue_start_pdsp(struct knav_device *kdev,
1615                            struct knav_pdsp_info *pdsp)
1616 {
1617         u32 val, timeout = 1000;
1618         int ret;
1619
1620         /* write a command for sync */
1621         writel_relaxed(0xffffffff, pdsp->command);
1622         while (readl_relaxed(pdsp->command) != 0xffffffff)
1623                 cpu_relax();
1624
1625         /* soft reset the PDSP */
1626         val  = readl_relaxed(&pdsp->regs->control);
1627         val &= ~(PDSP_CTRL_PC_MASK | PDSP_CTRL_SOFT_RESET);
1628         writel_relaxed(val, &pdsp->regs->control);
1629
1630         /* enable pdsp */
1631         val = readl_relaxed(&pdsp->regs->control) | PDSP_CTRL_ENABLE;
1632         writel_relaxed(val, &pdsp->regs->control);
1633
1634         /* wait for command register to clear */
1635         ret = knav_queue_pdsp_wait(pdsp->command, timeout, 0);
1636         if (ret < 0) {
1637                 dev_err(kdev->dev,
1638                         "timed out on pdsp %s command register wait\n",
1639                         pdsp->name);
1640                 return ret;
1641         }
1642         return 0;
1643 }
1644
1645 static void knav_queue_stop_pdsps(struct knav_device *kdev)
1646 {
1647         struct knav_pdsp_info *pdsp;
1648
1649         /* disable all pdsps */
1650         for_each_pdsp(kdev, pdsp)
1651                 knav_queue_stop_pdsp(kdev, pdsp);
1652 }
1653
1654 static int knav_queue_start_pdsps(struct knav_device *kdev)
1655 {
1656         struct knav_pdsp_info *pdsp;
1657         int ret;
1658
1659         knav_queue_stop_pdsps(kdev);
1660         /* now load them all. We return success even if pdsp
1661          * is not loaded as acc channels are optional on having
1662          * firmware availability in the system. We set the loaded
1663          * and stated flag and when initialize the acc range, check
1664          * it and init the range only if pdsp is started.
1665          */
1666         for_each_pdsp(kdev, pdsp) {
1667                 ret = knav_queue_load_pdsp(kdev, pdsp);
1668                 if (!ret)
1669                         pdsp->loaded = true;
1670         }
1671
1672         for_each_pdsp(kdev, pdsp) {
1673                 if (pdsp->loaded) {
1674                         ret = knav_queue_start_pdsp(kdev, pdsp);
1675                         if (!ret)
1676                                 pdsp->started = true;
1677                 }
1678         }
1679         return 0;
1680 }
1681
1682 static int knav_queue_setup_pdsps(struct knav_device *kdev,
1683                                   struct device_node *node)
1684 {
1685         struct device_node *pdsps __free(device_node) =
1686                         of_get_child_by_name(node, "pdsps");
1687
1688         if (pdsps) {
1689                 int ret;
1690
1691                 ret = knav_queue_init_pdsps(kdev, pdsps);
1692                 if (ret)
1693                         return ret;
1694
1695                 ret = knav_queue_start_pdsps(kdev);
1696                 if (ret)
1697                         return ret;
1698         }
1699         return 0;
1700 }
1701
1702 static inline struct knav_qmgr_info *knav_find_qmgr(unsigned id)
1703 {
1704         struct knav_qmgr_info *qmgr;
1705
1706         for_each_qmgr(kdev, qmgr) {
1707                 if ((id >= qmgr->start_queue) &&
1708                     (id < qmgr->start_queue + qmgr->num_queues))
1709                         return qmgr;
1710         }
1711         return NULL;
1712 }
1713
1714 static int knav_queue_init_queue(struct knav_device *kdev,
1715                                         struct knav_range_info *range,
1716                                         struct knav_queue_inst *inst,
1717                                         unsigned id)
1718 {
1719         char irq_name[KNAV_NAME_SIZE];
1720         inst->qmgr = knav_find_qmgr(id);
1721         if (!inst->qmgr)
1722                 return -1;
1723
1724         INIT_LIST_HEAD(&inst->handles);
1725         inst->kdev = kdev;
1726         inst->range = range;
1727         inst->irq_num = -1;
1728         inst->id = id;
1729         scnprintf(irq_name, sizeof(irq_name), "hwqueue-%d", id);
1730         inst->irq_name = kstrndup(irq_name, sizeof(irq_name), GFP_KERNEL);
1731
1732         if (range->ops && range->ops->init_queue)
1733                 return range->ops->init_queue(range, inst);
1734         else
1735                 return 0;
1736 }
1737
1738 static int knav_queue_init_queues(struct knav_device *kdev)
1739 {
1740         struct knav_range_info *range;
1741         int size, id, base_idx;
1742         int idx = 0, ret = 0;
1743
1744         /* how much do we need for instance data? */
1745         size = sizeof(struct knav_queue_inst);
1746
1747         /* round this up to a power of 2, keep the index to instance
1748          * arithmetic fast.
1749          * */
1750         kdev->inst_shift = order_base_2(size);
1751         size = (1 << kdev->inst_shift) * kdev->num_queues_in_use;
1752         kdev->instances = devm_kzalloc(kdev->dev, size, GFP_KERNEL);
1753         if (!kdev->instances)
1754                 return -ENOMEM;
1755
1756         for_each_queue_range(kdev, range) {
1757                 if (range->ops && range->ops->init_range)
1758                         range->ops->init_range(range);
1759                 base_idx = idx;
1760                 for (id = range->queue_base;
1761                      id < range->queue_base + range->num_queues; id++, idx++) {
1762                         ret = knav_queue_init_queue(kdev, range,
1763                                         knav_queue_idx_to_inst(kdev, idx), id);
1764                         if (ret < 0)
1765                                 return ret;
1766                 }
1767                 range->queue_base_inst =
1768                         knav_queue_idx_to_inst(kdev, base_idx);
1769         }
1770         return 0;
1771 }
1772
1773 /* Match table for of_platform binding */
1774 static const struct of_device_id keystone_qmss_of_match[] = {
1775         {
1776                 .compatible = "ti,keystone-navigator-qmss",
1777         },
1778         {
1779                 .compatible = "ti,66ak2g-navss-qm",
1780                 .data   = (void *)QMSS_66AK2G,
1781         },
1782         {},
1783 };
1784 MODULE_DEVICE_TABLE(of, keystone_qmss_of_match);
1785
1786 static int knav_queue_probe(struct platform_device *pdev)
1787 {
1788         struct device_node *node = pdev->dev.of_node;
1789         struct device *dev = &pdev->dev;
1790         u32 temp[2];
1791         int ret;
1792
1793         if (!node) {
1794                 dev_err(dev, "device tree info unavailable\n");
1795                 return -ENODEV;
1796         }
1797
1798         kdev = devm_kzalloc(dev, sizeof(struct knav_device), GFP_KERNEL);
1799         if (!kdev) {
1800                 dev_err(dev, "memory allocation failed\n");
1801                 return -ENOMEM;
1802         }
1803
1804         if (device_get_match_data(dev))
1805                 kdev->version = QMSS_66AK2G;
1806
1807         platform_set_drvdata(pdev, kdev);
1808         kdev->dev = dev;
1809         INIT_LIST_HEAD(&kdev->queue_ranges);
1810         INIT_LIST_HEAD(&kdev->qmgrs);
1811         INIT_LIST_HEAD(&kdev->pools);
1812         INIT_LIST_HEAD(&kdev->regions);
1813         INIT_LIST_HEAD(&kdev->pdsps);
1814
1815         pm_runtime_enable(&pdev->dev);
1816         ret = pm_runtime_resume_and_get(&pdev->dev);
1817         if (ret < 0) {
1818                 pm_runtime_disable(&pdev->dev);
1819                 dev_err(dev, "Failed to enable QMSS\n");
1820                 return ret;
1821         }
1822
1823         if (of_property_read_u32_array(node, "queue-range", temp, 2)) {
1824                 dev_err(dev, "queue-range not specified\n");
1825                 ret = -ENODEV;
1826                 goto err;
1827         }
1828         kdev->base_id    = temp[0];
1829         kdev->num_queues = temp[1];
1830
1831         /* Initialize queue managers using device tree configuration */
1832         ret = knav_queue_init_qmgrs(kdev, node);
1833         if (ret)
1834                 goto err;
1835
1836         /* get pdsp configuration values from device tree */
1837         ret = knav_queue_setup_pdsps(kdev, node);
1838         if (ret)
1839                 goto err;
1840
1841         /* get usable queue range values from device tree */
1842         ret = knav_setup_queue_pools(kdev, node);
1843         if (ret)
1844                 goto err;
1845
1846         ret = knav_get_link_ram(kdev, "linkram0", &kdev->link_rams[0]);
1847         if (ret) {
1848                 dev_err(kdev->dev, "could not setup linking ram\n");
1849                 goto err;
1850         }
1851
1852         ret = knav_get_link_ram(kdev, "linkram1", &kdev->link_rams[1]);
1853         if (ret) {
1854                 /*
1855                  * nothing really, we have one linking ram already, so we just
1856                  * live within our means
1857                  */
1858         }
1859
1860         ret = knav_queue_setup_link_ram(kdev);
1861         if (ret)
1862                 goto err;
1863
1864         ret = knav_queue_setup_regions(kdev, node);
1865         if (ret)
1866                 goto err;
1867
1868         ret = knav_queue_init_queues(kdev);
1869         if (ret < 0) {
1870                 dev_err(dev, "hwqueue initialization failed\n");
1871                 goto err;
1872         }
1873
1874         debugfs_create_file("qmss", S_IFREG | S_IRUGO, NULL, NULL,
1875                             &knav_queue_debug_fops);
1876         device_ready = true;
1877         return 0;
1878
1879 err:
1880         knav_queue_stop_pdsps(kdev);
1881         knav_queue_free_regions(kdev);
1882         knav_free_queue_ranges(kdev);
1883         pm_runtime_put_sync(&pdev->dev);
1884         pm_runtime_disable(&pdev->dev);
1885         return ret;
1886 }
1887
1888 static void knav_queue_remove(struct platform_device *pdev)
1889 {
1890         /* TODO: Free resources */
1891         pm_runtime_put_sync(&pdev->dev);
1892         pm_runtime_disable(&pdev->dev);
1893 }
1894
1895 static struct platform_driver keystone_qmss_driver = {
1896         .probe          = knav_queue_probe,
1897         .remove_new     = knav_queue_remove,
1898         .driver         = {
1899                 .name   = "keystone-navigator-qmss",
1900                 .of_match_table = keystone_qmss_of_match,
1901         },
1902 };
1903 module_platform_driver(keystone_qmss_driver);
1904
1905 MODULE_LICENSE("GPL v2");
1906 MODULE_DESCRIPTION("TI QMSS driver for Keystone SOCs");
1907 MODULE_AUTHOR("Sandeep Nair <[email protected]>");
1908 MODULE_AUTHOR("Santosh Shilimkar <[email protected]>");