drivers/dma/qcom/hidma.c

   1 /*
   2  * Qualcomm Technologies HIDMA DMA engine interface
   3  *
   4  * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   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  * Copyright (C) Freescale Semicondutor, Inc. 2007, 2008.
  18  * Copyright (C) Semihalf 2009
  19  * Copyright (C) Ilya Yanok, Emcraft Systems 2010
  20  * Copyright (C) Alexander Popov, Promcontroller 2014
  21  *
  22  * Written by Piotr Ziecik <kosmo@semihalf.com>. Hardware description
  23  * (defines, structures and comments) was taken from MPC5121 DMA driver
  24  * written by Hongjun Chen <hong-jun.chen@freescale.com>.
  25  *
  26  * Approved as OSADL project by a majority of OSADL members and funded
  27  * by OSADL membership fees in 2009;  for details see www.osadl.org.
  28  *
  29  * This program is free software; you can redistribute it and/or modify it
  30  * under the terms of the GNU General Public License as published by the Free
  31  * Software Foundation; either version 2 of the License, or (at your option)
  32  * any later version.
  33  *
  34  * This program is distributed in the hope that it will be useful, but WITHOUT
  35  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  36  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  37  * more details.
  38  *
  39  * The full GNU General Public License is included in this distribution in the
  40  * file called COPYING.
  41  */
  42
  43 /* Linux Foundation elects GPLv2 license only. */
  44
  45 #include <linux/dmaengine.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/list.h>
  48 #include <linux/module.h>
  49 #include <linux/platform_device.h>
  50 #include <linux/slab.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/of_dma.h>
  53 #include <linux/property.h>
  54 #include <linux/delay.h>
  55 #include <linux/acpi.h>
  56 #include <linux/irq.h>
  57 #include <linux/atomic.h>
  58 #include <linux/pm_runtime.h>
  59
  60 #include "../dmaengine.h"
  61 #include "hidma.h"
  62
  63 /*
  64  * Default idle time is 2 seconds. This parameter can
  65  * be overridden by changing the following
  66  * /sys/bus/platform/devices/QCOM8061:<xy>/power/autosuspend_delay_ms
  67  * during kernel boot.
  68  */
  69 #define HIDMA_AUTOSUSPEND_TIMEOUT               2000
  70 #define HIDMA_ERR_INFO_SW                       0xFF
  71 #define HIDMA_ERR_CODE_UNEXPECTED_TERMINATE     0x0
  72 #define HIDMA_NR_DEFAULT_DESC                   10
  73
  74 static inline struct hidma_dev *to_hidma_dev(struct dma_device *dmadev)
  75 {
  76         return container_of(dmadev, struct hidma_dev, ddev);
  77 }
  78
  79 static inline
  80 struct hidma_dev *to_hidma_dev_from_lldev(struct hidma_lldev **_lldevp)
  81 {
  82         return container_of(_lldevp, struct hidma_dev, lldev);
  83 }
  84
  85 static inline struct hidma_chan *to_hidma_chan(struct dma_chan *dmach)
  86 {
  87         return container_of(dmach, struct hidma_chan, chan);
  88 }
  89
  90 static inline
  91 struct hidma_desc *to_hidma_desc(struct dma_async_tx_descriptor *t)
  92 {
  93         return container_of(t, struct hidma_desc, desc);
  94 }
  95
  96 static void hidma_free(struct hidma_dev *dmadev)
  97 {
  98         INIT_LIST_HEAD(&dmadev->ddev.channels);
  99 }
 100
 101 static unsigned int nr_desc_prm;
 102 module_param(nr_desc_prm, uint, 0644);
 103 MODULE_PARM_DESC(nr_desc_prm, "number of descriptors (default: 0)");
 104
 105
 106 /* process completed descriptors */
 107 static void hidma_process_completed(struct hidma_chan *mchan)
 108 {
 109         struct dma_device *ddev = mchan->chan.device;
 110         struct hidma_dev *mdma = to_hidma_dev(ddev);
 111         struct dma_async_tx_descriptor *desc;
 112         dma_cookie_t last_cookie;
 113         struct hidma_desc *mdesc;
 114         struct hidma_desc *next;
 115         unsigned long irqflags;
 116         struct list_head list;
 117
 118         INIT_LIST_HEAD(&list);
 119
 120         /* Get all completed descriptors */
 121         spin_lock_irqsave(&mchan->lock, irqflags);
 122         list_splice_tail_init(&mchan->completed, &list);
 123         spin_unlock_irqrestore(&mchan->lock, irqflags);
 124
 125         /* Execute callbacks and run dependencies */
 126         list_for_each_entry_safe(mdesc, next, &list, node) {
 127                 enum dma_status llstat;
 128                 struct dmaengine_desc_callback cb;
 129                 struct dmaengine_result result;
 130
 131                 desc = &mdesc->desc;
 132                 last_cookie = desc->cookie;
 133
 134                 spin_lock_irqsave(&mchan->lock, irqflags);
 135                 dma_cookie_complete(desc);
 136                 spin_unlock_irqrestore(&mchan->lock, irqflags);
 137
 138                 llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch);
 139                 dmaengine_desc_get_callback(desc, &cb);
 140
 141                 dma_run_dependencies(desc);
 142
 143                 spin_lock_irqsave(&mchan->lock, irqflags);
 144                 list_move(&mdesc->node, &mchan->free);
 145
 146                 if (llstat == DMA_COMPLETE) {
 147                         mchan->last_success = last_cookie;
 148                         result.result = DMA_TRANS_NOERROR;
 149                 } else
 150                         result.result = DMA_TRANS_ABORTED;
 151
 152                 spin_unlock_irqrestore(&mchan->lock, irqflags);
 153
 154                 dmaengine_desc_callback_invoke(&cb, &result);
 155         }
 156 }
 157
 158 /*
 159  * Called once for each submitted descriptor.
 160  * PM is locked once for each descriptor that is currently
 161  * in execution.
 162  */
 163 static void hidma_callback(void *data)
 164 {
 165         struct hidma_desc *mdesc = data;
 166         struct hidma_chan *mchan = to_hidma_chan(mdesc->desc.chan);
 167         struct dma_device *ddev = mchan->chan.device;
 168         struct hidma_dev *dmadev = to_hidma_dev(ddev);
 169         unsigned long irqflags;
 170         bool queued = false;
 171
 172         spin_lock_irqsave(&mchan->lock, irqflags);
 173         if (mdesc->node.next) {
 174                 /* Delete from the active list, add to completed list */
 175                 list_move_tail(&mdesc->node, &mchan->completed);
 176                 queued = true;
 177
 178                 /* calculate the next running descriptor */
 179                 mchan->running = list_first_entry(&mchan->active,
 180                                                   struct hidma_desc, node);
 181         }
 182         spin_unlock_irqrestore(&mchan->lock, irqflags);
 183
 184         hidma_process_completed(mchan);
 185
 186         if (queued) {
 187                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 188                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 189         }
 190 }
 191
 192 static int hidma_chan_init(struct hidma_dev *dmadev, u32 dma_sig)
 193 {
 194         struct hidma_chan *mchan;
 195         struct dma_device *ddev;
 196
 197         mchan = devm_kzalloc(dmadev->ddev.dev, sizeof(*mchan), GFP_KERNEL);
 198         if (!mchan)
 199                 return -ENOMEM;
 200
 201         ddev = &dmadev->ddev;
 202         mchan->dma_sig = dma_sig;
 203         mchan->dmadev = dmadev;
 204         mchan->chan.device = ddev;
 205         dma_cookie_init(&mchan->chan);
 206
 207         INIT_LIST_HEAD(&mchan->free);
 208         INIT_LIST_HEAD(&mchan->prepared);
 209         INIT_LIST_HEAD(&mchan->active);
 210         INIT_LIST_HEAD(&mchan->completed);
 211
 212         spin_lock_init(&mchan->lock);
 213         list_add_tail(&mchan->chan.device_node, &ddev->channels);
 214         dmadev->ddev.chancnt++;
 215         return 0;
 216 }
 217
 218 static void hidma_issue_task(unsigned long arg)
 219 {
 220         struct hidma_dev *dmadev = (struct hidma_dev *)arg;
 221
 222         pm_runtime_get_sync(dmadev->ddev.dev);
 223         hidma_ll_start(dmadev->lldev);
 224 }
 225
 226 static void hidma_issue_pending(struct dma_chan *dmach)
 227 {
 228         struct hidma_chan *mchan = to_hidma_chan(dmach);
 229         struct hidma_dev *dmadev = mchan->dmadev;
 230         unsigned long flags;
 231         int status;
 232
 233         spin_lock_irqsave(&mchan->lock, flags);
 234         if (!mchan->running) {
 235                 struct hidma_desc *desc = list_first_entry(&mchan->active,
 236                                                            struct hidma_desc,
 237                                                            node);
 238                 mchan->running = desc;
 239         }
 240         spin_unlock_irqrestore(&mchan->lock, flags);
 241
 242         /* PM will be released in hidma_callback function. */
 243         status = pm_runtime_get(dmadev->ddev.dev);
 244         if (status < 0)
 245                 tasklet_schedule(&dmadev->task);
 246         else
 247                 hidma_ll_start(dmadev->lldev);
 248 }
 249
 250 static inline bool hidma_txn_is_success(dma_cookie_t cookie,
 251                 dma_cookie_t last_success, dma_cookie_t last_used)
 252 {
 253         if (last_success <= last_used) {
 254                 if ((cookie <= last_success) || (cookie > last_used))
 255                         return true;
 256         } else {
 257                 if ((cookie <= last_success) && (cookie > last_used))
 258                         return true;
 259         }
 260         return false;
 261 }
 262
 263 static enum dma_status hidma_tx_status(struct dma_chan *dmach,
 264                                        dma_cookie_t cookie,
 265                                        struct dma_tx_state *txstate)
 266 {
 267         struct hidma_chan *mchan = to_hidma_chan(dmach);
 268         enum dma_status ret;
 269
 270         ret = dma_cookie_status(dmach, cookie, txstate);
 271         if (ret == DMA_COMPLETE) {
 272                 bool is_success;
 273
 274                 is_success = hidma_txn_is_success(cookie, mchan->last_success,
 275                                                   dmach->cookie);
 276                 return is_success ? ret : DMA_ERROR;
 277         }
 278
 279         if (mchan->paused && (ret == DMA_IN_PROGRESS)) {
 280                 unsigned long flags;
 281                 dma_cookie_t runcookie;
 282
 283                 spin_lock_irqsave(&mchan->lock, flags);
 284                 if (mchan->running)
 285                         runcookie = mchan->running->desc.cookie;
 286                 else
 287                         runcookie = -EINVAL;
 288
 289                 if (runcookie == cookie)
 290                         ret = DMA_PAUSED;
 291
 292                 spin_unlock_irqrestore(&mchan->lock, flags);
 293         }
 294
 295         return ret;
 296 }
 297
 298 /*
 299  * Submit descriptor to hardware.
 300  * Lock the PM for each descriptor we are sending.
 301  */
 302 static dma_cookie_t hidma_tx_submit(struct dma_async_tx_descriptor *txd)
 303 {
 304         struct hidma_chan *mchan = to_hidma_chan(txd->chan);
 305         struct hidma_dev *dmadev = mchan->dmadev;
 306         struct hidma_desc *mdesc;
 307         unsigned long irqflags;
 308         dma_cookie_t cookie;
 309
 310         pm_runtime_get_sync(dmadev->ddev.dev);
 311         if (!hidma_ll_isenabled(dmadev->lldev)) {
 312                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 313                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 314                 return -ENODEV;
 315         }
 316
 317         mdesc = container_of(txd, struct hidma_desc, desc);
 318         spin_lock_irqsave(&mchan->lock, irqflags);
 319
 320         /* Move descriptor to active */
 321         list_move_tail(&mdesc->node, &mchan->active);
 322
 323         /* Update cookie */
 324         cookie = dma_cookie_assign(txd);
 325
 326         hidma_ll_queue_request(dmadev->lldev, mdesc->tre_ch);
 327         spin_unlock_irqrestore(&mchan->lock, irqflags);
 328
 329         return cookie;
 330 }
 331
 332 static int hidma_alloc_chan_resources(struct dma_chan *dmach)
 333 {
 334         struct hidma_chan *mchan = to_hidma_chan(dmach);
 335         struct hidma_dev *dmadev = mchan->dmadev;
 336         struct hidma_desc *mdesc, *tmp;
 337         unsigned long irqflags;
 338         LIST_HEAD(descs);
 339         unsigned int i;
 340         int rc = 0;
 341
 342         if (mchan->allocated)
 343                 return 0;
 344
 345         /* Alloc descriptors for this channel */
 346         for (i = 0; i < dmadev->nr_descriptors; i++) {
 347                 mdesc = kzalloc(sizeof(struct hidma_desc), GFP_NOWAIT);
 348                 if (!mdesc) {
 349                         rc = -ENOMEM;
 350                         break;
 351                 }
 352                 dma_async_tx_descriptor_init(&mdesc->desc, dmach);
 353                 mdesc->desc.tx_submit = hidma_tx_submit;
 354
 355                 rc = hidma_ll_request(dmadev->lldev, mchan->dma_sig,
 356                                       "DMA engine", hidma_callback, mdesc,
 357                                       &mdesc->tre_ch);
 358                 if (rc) {
 359                         dev_err(dmach->device->dev,
 360                                 "channel alloc failed at %u\n", i);
 361                         kfree(mdesc);
 362                         break;
 363                 }
 364                 list_add_tail(&mdesc->node, &descs);
 365         }
 366
 367         if (rc) {
 368                 /* return the allocated descriptors */
 369                 list_for_each_entry_safe(mdesc, tmp, &descs, node) {
 370                         hidma_ll_free(dmadev->lldev, mdesc->tre_ch);
 371                         kfree(mdesc);
 372                 }
 373                 return rc;
 374         }
 375
 376         spin_lock_irqsave(&mchan->lock, irqflags);
 377         list_splice_tail_init(&descs, &mchan->free);
 378         mchan->allocated = true;
 379         spin_unlock_irqrestore(&mchan->lock, irqflags);
 380         return 1;
 381 }
 382
 383 static struct dma_async_tx_descriptor *
 384 hidma_prep_dma_memcpy(struct dma_chan *dmach, dma_addr_t dest, dma_addr_t src,
 385                 size_t len, unsigned long flags)
 386 {
 387         struct hidma_chan *mchan = to_hidma_chan(dmach);
 388         struct hidma_desc *mdesc = NULL;
 389         struct hidma_dev *mdma = mchan->dmadev;
 390         unsigned long irqflags;
 391
 392         /* Get free descriptor */
 393         spin_lock_irqsave(&mchan->lock, irqflags);
 394         if (!list_empty(&mchan->free)) {
 395                 mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
 396                 list_del(&mdesc->node);
 397         }
 398         spin_unlock_irqrestore(&mchan->lock, irqflags);
 399
 400         if (!mdesc)
 401                 return NULL;
 402
 403         hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
 404                                      src, dest, len, flags);
 405
 406         /* Place descriptor in prepared list */
 407         spin_lock_irqsave(&mchan->lock, irqflags);
 408         list_add_tail(&mdesc->node, &mchan->prepared);
 409         spin_unlock_irqrestore(&mchan->lock, irqflags);
 410
 411         return &mdesc->desc;
 412 }
 413
 414 static int hidma_terminate_channel(struct dma_chan *chan)
 415 {
 416         struct hidma_chan *mchan = to_hidma_chan(chan);
 417         struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
 418         struct hidma_desc *tmp, *mdesc;
 419         unsigned long irqflags;
 420         LIST_HEAD(list);
 421         int rc;
 422
 423         pm_runtime_get_sync(dmadev->ddev.dev);
 424         /* give completed requests a chance to finish */
 425         hidma_process_completed(mchan);
 426
 427         spin_lock_irqsave(&mchan->lock, irqflags);
 428         mchan->last_success = 0;
 429         list_splice_init(&mchan->active, &list);
 430         list_splice_init(&mchan->prepared, &list);
 431         list_splice_init(&mchan->completed, &list);
 432         spin_unlock_irqrestore(&mchan->lock, irqflags);
 433
 434         /* this suspends the existing transfer */
 435         rc = hidma_ll_disable(dmadev->lldev);
 436         if (rc) {
 437                 dev_err(dmadev->ddev.dev, "channel did not pause\n");
 438                 goto out;
 439         }
 440
 441         /* return all user requests */
 442         list_for_each_entry_safe(mdesc, tmp, &list, node) {
 443                 struct dma_async_tx_descriptor *txd = &mdesc->desc;
 444
 445                 dma_descriptor_unmap(txd);
 446                 dmaengine_desc_get_callback_invoke(txd, NULL);
 447                 dma_run_dependencies(txd);
 448
 449                 /* move myself to free_list */
 450                 list_move(&mdesc->node, &mchan->free);
 451         }
 452
 453         rc = hidma_ll_enable(dmadev->lldev);
 454 out:
 455         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 456         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 457         return rc;
 458 }
 459
 460 static int hidma_terminate_all(struct dma_chan *chan)
 461 {
 462         struct hidma_chan *mchan = to_hidma_chan(chan);
 463         struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
 464         int rc;
 465
 466         rc = hidma_terminate_channel(chan);
 467         if (rc)
 468                 return rc;
 469
 470         /* reinitialize the hardware */
 471         pm_runtime_get_sync(dmadev->ddev.dev);
 472         rc = hidma_ll_setup(dmadev->lldev);
 473         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 474         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 475         return rc;
 476 }
 477
 478 static void hidma_free_chan_resources(struct dma_chan *dmach)
 479 {
 480         struct hidma_chan *mchan = to_hidma_chan(dmach);
 481         struct hidma_dev *mdma = mchan->dmadev;
 482         struct hidma_desc *mdesc, *tmp;
 483         unsigned long irqflags;
 484         LIST_HEAD(descs);
 485
 486         /* terminate running transactions and free descriptors */
 487         hidma_terminate_channel(dmach);
 488
 489         spin_lock_irqsave(&mchan->lock, irqflags);
 490
 491         /* Move data */
 492         list_splice_tail_init(&mchan->free, &descs);
 493
 494         /* Free descriptors */
 495         list_for_each_entry_safe(mdesc, tmp, &descs, node) {
 496                 hidma_ll_free(mdma->lldev, mdesc->tre_ch);
 497                 list_del(&mdesc->node);
 498                 kfree(mdesc);
 499         }
 500
 501         mchan->allocated = 0;
 502         spin_unlock_irqrestore(&mchan->lock, irqflags);
 503 }
 504
 505 static int hidma_pause(struct dma_chan *chan)
 506 {
 507         struct hidma_chan *mchan;
 508         struct hidma_dev *dmadev;
 509
 510         mchan = to_hidma_chan(chan);
 511         dmadev = to_hidma_dev(mchan->chan.device);
 512         if (!mchan->paused) {
 513                 pm_runtime_get_sync(dmadev->ddev.dev);
 514                 if (hidma_ll_disable(dmadev->lldev))
 515                         dev_warn(dmadev->ddev.dev, "channel did not stop\n");
 516                 mchan->paused = true;
 517                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 518                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 519         }
 520         return 0;
 521 }
 522
 523 static int hidma_resume(struct dma_chan *chan)
 524 {
 525         struct hidma_chan *mchan;
 526         struct hidma_dev *dmadev;
 527         int rc = 0;
 528
 529         mchan = to_hidma_chan(chan);
 530         dmadev = to_hidma_dev(mchan->chan.device);
 531         if (mchan->paused) {
 532                 pm_runtime_get_sync(dmadev->ddev.dev);
 533                 rc = hidma_ll_enable(dmadev->lldev);
 534                 if (!rc)
 535                         mchan->paused = false;
 536                 else
 537                         dev_err(dmadev->ddev.dev,
 538                                 "failed to resume the channel");
 539                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 540                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 541         }
 542         return rc;
 543 }
 544
 545 static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
 546 {
 547         struct hidma_lldev *lldev = arg;
 548
 549         /*
 550          * All interrupts are request driven.
 551          * HW doesn't send an interrupt by itself.
 552          */
 553         return hidma_ll_inthandler(chirq, lldev);
 554 }
 555
 556 static ssize_t hidma_show_values(struct device *dev,
 557                                  struct device_attribute *attr, char *buf)
 558 {
 559         struct platform_device *pdev = to_platform_device(dev);
 560         struct hidma_dev *mdev = platform_get_drvdata(pdev);
 561
 562         buf[0] = 0;
 563
 564         if (strcmp(attr->attr.name, "chid") == 0)
 565                 sprintf(buf, "%d\n", mdev->chidx);
 566
 567         return strlen(buf);
 568 }
 569
 570 static int hidma_create_sysfs_entry(struct hidma_dev *dev, char *name,
 571                                     int mode)
 572 {
 573         struct device_attribute *attrs;
 574         char *name_copy;
 575
 576         attrs = devm_kmalloc(dev->ddev.dev, sizeof(struct device_attribute),
 577                              GFP_KERNEL);
 578         if (!attrs)
 579                 return -ENOMEM;
 580
 581         name_copy = devm_kstrdup(dev->ddev.dev, name, GFP_KERNEL);
 582         if (!name_copy)
 583                 return -ENOMEM;
 584
 585         attrs->attr.name = name_copy;
 586         attrs->attr.mode = mode;
 587         attrs->show = hidma_show_values;
 588         sysfs_attr_init(&attrs->attr);
 589
 590         return device_create_file(dev->ddev.dev, attrs);
 591 }
 592
 593 static int hidma_probe(struct platform_device *pdev)
 594 {
 595         struct hidma_dev *dmadev;
 596         struct resource *trca_resource;
 597         struct resource *evca_resource;
 598         int chirq;
 599         void __iomem *evca;
 600         void __iomem *trca;
 601         int rc;
 602
 603         pm_runtime_set_autosuspend_delay(&pdev->dev, HIDMA_AUTOSUSPEND_TIMEOUT);
 604         pm_runtime_use_autosuspend(&pdev->dev);
 605         pm_runtime_set_active(&pdev->dev);
 606         pm_runtime_enable(&pdev->dev);
 607
 608         trca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 609         trca = devm_ioremap_resource(&pdev->dev, trca_resource);
 610         if (IS_ERR(trca)) {
 611                 rc = -ENOMEM;
 612                 goto bailout;
 613         }
 614
 615         evca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 616         evca = devm_ioremap_resource(&pdev->dev, evca_resource);
 617         if (IS_ERR(evca)) {
 618                 rc = -ENOMEM;
 619                 goto bailout;
 620         }
 621
 622         /*
 623          * This driver only handles the channel IRQs.
 624          * Common IRQ is handled by the management driver.
 625          */
 626         chirq = platform_get_irq(pdev, 0);
 627         if (chirq < 0) {
 628                 rc = -ENODEV;
 629                 goto bailout;
 630         }
 631
 632         dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
 633         if (!dmadev) {
 634                 rc = -ENOMEM;
 635                 goto bailout;
 636         }
 637
 638         INIT_LIST_HEAD(&dmadev->ddev.channels);
 639         spin_lock_init(&dmadev->lock);
 640         dmadev->ddev.dev = &pdev->dev;
 641         pm_runtime_get_sync(dmadev->ddev.dev);
 642
 643         dma_cap_set(DMA_MEMCPY, dmadev->ddev.cap_mask);
 644         if (WARN_ON(!pdev->dev.dma_mask)) {
 645                 rc = -ENXIO;
 646                 goto dmafree;
 647         }
 648
 649         dmadev->dev_evca = evca;
 650         dmadev->evca_resource = evca_resource;
 651         dmadev->dev_trca = trca;
 652         dmadev->trca_resource = trca_resource;
 653         dmadev->ddev.device_prep_dma_memcpy = hidma_prep_dma_memcpy;
 654         dmadev->ddev.device_alloc_chan_resources = hidma_alloc_chan_resources;
 655         dmadev->ddev.device_free_chan_resources = hidma_free_chan_resources;
 656         dmadev->ddev.device_tx_status = hidma_tx_status;
 657         dmadev->ddev.device_issue_pending = hidma_issue_pending;
 658         dmadev->ddev.device_pause = hidma_pause;
 659         dmadev->ddev.device_resume = hidma_resume;
 660         dmadev->ddev.device_terminate_all = hidma_terminate_all;
 661         dmadev->ddev.copy_align = 8;
 662
 663         device_property_read_u32(&pdev->dev, "desc-count",
 664                                  &dmadev->nr_descriptors);
 665
 666         if (!dmadev->nr_descriptors && nr_desc_prm)
 667                 dmadev->nr_descriptors = nr_desc_prm;
 668
 669         if (!dmadev->nr_descriptors)
 670                 dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;
 671
 672         dmadev->chidx = readl(dmadev->dev_trca + 0x28);
 673
 674         /* Set DMA mask to 64 bits. */
 675         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 676         if (rc) {
 677                 dev_warn(&pdev->dev, "unable to set coherent mask to 64");
 678                 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 679                 if (rc)
 680                         goto dmafree;
 681         }
 682
 683         dmadev->lldev = hidma_ll_init(dmadev->ddev.dev,
 684                                       dmadev->nr_descriptors, dmadev->dev_trca,
 685                                       dmadev->dev_evca, dmadev->chidx);
 686         if (!dmadev->lldev) {
 687                 rc = -EPROBE_DEFER;
 688                 goto dmafree;
 689         }
 690
 691         rc = devm_request_irq(&pdev->dev, chirq, hidma_chirq_handler, 0,
 692                               "qcom-hidma", dmadev->lldev);
 693         if (rc)
 694                 goto uninit;
 695
 696         INIT_LIST_HEAD(&dmadev->ddev.channels);
 697         rc = hidma_chan_init(dmadev, 0);
 698         if (rc)
 699                 goto uninit;
 700
 701         rc = dma_async_device_register(&dmadev->ddev);
 702         if (rc)
 703                 goto uninit;
 704
 705         dmadev->irq = chirq;
 706         tasklet_init(&dmadev->task, hidma_issue_task, (unsigned long)dmadev);
 707         hidma_debug_init(dmadev);
 708         hidma_create_sysfs_entry(dmadev, "chid", S_IRUGO);
 709         dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
 710         platform_set_drvdata(pdev, dmadev);
 711         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 712         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 713         return 0;
 714
 715 uninit:
 716         hidma_debug_uninit(dmadev);
 717         hidma_ll_uninit(dmadev->lldev);
 718 dmafree:
 719         if (dmadev)
 720                 hidma_free(dmadev);
 721 bailout:
 722         pm_runtime_put_sync(&pdev->dev);
 723         pm_runtime_disable(&pdev->dev);
 724         return rc;
 725 }
 726
 727 static int hidma_remove(struct platform_device *pdev)
 728 {
 729         struct hidma_dev *dmadev = platform_get_drvdata(pdev);
 730
 731         pm_runtime_get_sync(dmadev->ddev.dev);
 732         dma_async_device_unregister(&dmadev->ddev);
 733         devm_free_irq(dmadev->ddev.dev, dmadev->irq, dmadev->lldev);
 734         tasklet_kill(&dmadev->task);
 735         hidma_debug_uninit(dmadev);
 736         hidma_ll_uninit(dmadev->lldev);
 737         hidma_free(dmadev);
 738
 739         dev_info(&pdev->dev, "HI-DMA engine removed\n");
 740         pm_runtime_put_sync_suspend(&pdev->dev);
 741         pm_runtime_disable(&pdev->dev);
 742
 743         return 0;
 744 }
 745
 746 #if IS_ENABLED(CONFIG_ACPI)
 747 static const struct acpi_device_id hidma_acpi_ids[] = {
 748         {"QCOM8061"},
 749         {},
 750 };
 751 #endif
 752
 753 static const struct of_device_id hidma_match[] = {
 754         {.compatible = "qcom,hidma-1.0",},
 755         {},
 756 };
 757 MODULE_DEVICE_TABLE(of, hidma_match);
 758
 759 static struct platform_driver hidma_driver = {
 760         .probe = hidma_probe,
 761         .remove = hidma_remove,
 762         .driver = {
 763                    .name = "hidma",
 764                    .of_match_table = hidma_match,
 765                    .acpi_match_table = ACPI_PTR(hidma_acpi_ids),
 766         },
 767 };
 768
 769 module_platform_driver(hidma_driver);
 770 MODULE_LICENSE("GPL v2");