root/drivers/dma/qcom/hidma.c

DEFINITIONS

1. to_hidma_dev
2. to_hidma_dev_from_lldev
3. to_hidma_chan
4. to_hidma_desc
5. hidma_free
6. hidma_process_completed
7. hidma_callback
8. hidma_chan_init
9. hidma_issue_task
10. hidma_issue_pending
11. hidma_txn_is_success
12. hidma_tx_status
13. hidma_tx_submit
14. hidma_alloc_chan_resources
15. hidma_prep_dma_memcpy
16. hidma_prep_dma_memset
17. hidma_terminate_channel
18. hidma_terminate_all
19. hidma_free_chan_resources
20. hidma_pause
21. hidma_resume
22. hidma_chirq_handler
23. hidma_chirq_handler_msi
24. hidma_show_values
25. hidma_sysfs_uninit
26. hidma_create_sysfs_entry
27. hidma_sysfs_init
28. hidma_write_msi_msg
29. hidma_free_msis
30. hidma_request_msi
31. hidma_test_capability
32. hidma_probe
33. hidma_shutdown
34. hidma_remove

   1 /*
   2  * Qualcomm Technologies HIDMA DMA engine interface
   3  *
   4  * Copyright (c) 2015-2017, 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/of_device.h>
  54 #include <linux/property.h>
  55 #include <linux/delay.h>
  56 #include <linux/acpi.h>
  57 #include <linux/irq.h>
  58 #include <linux/atomic.h>
  59 #include <linux/pm_runtime.h>
  60 #include <linux/msi.h>
  61 
  62 #include "../dmaengine.h"
  63 #include "hidma.h"
  64 
  65 /*
  66  * Default idle time is 2 seconds. This parameter can
  67  * be overridden by changing the following
  68  * /sys/bus/platform/devices/QCOM8061:<xy>/power/autosuspend_delay_ms
  69  * during kernel boot.
  70  */
  71 #define HIDMA_AUTOSUSPEND_TIMEOUT               2000
  72 #define HIDMA_ERR_INFO_SW                       0xFF
  73 #define HIDMA_ERR_CODE_UNEXPECTED_TERMINATE     0x0
  74 #define HIDMA_NR_DEFAULT_DESC                   10
  75 #define HIDMA_MSI_INTS                          11
  76 
  77 static inline struct hidma_dev *to_hidma_dev(struct dma_device *dmadev)
  78 {
  79         return container_of(dmadev, struct hidma_dev, ddev);
  80 }
  81 
  82 static inline
  83 struct hidma_dev *to_hidma_dev_from_lldev(struct hidma_lldev **_lldevp)
  84 {
  85         return container_of(_lldevp, struct hidma_dev, lldev);
  86 }
  87 
  88 static inline struct hidma_chan *to_hidma_chan(struct dma_chan *dmach)
  89 {
  90         return container_of(dmach, struct hidma_chan, chan);
  91 }
  92 
  93 static inline
  94 struct hidma_desc *to_hidma_desc(struct dma_async_tx_descriptor *t)
  95 {
  96         return container_of(t, struct hidma_desc, desc);
  97 }
  98 
  99 static void hidma_free(struct hidma_dev *dmadev)
 100 {
 101         INIT_LIST_HEAD(&dmadev->ddev.channels);
 102 }
 103 
 104 static unsigned int nr_desc_prm;
 105 module_param(nr_desc_prm, uint, 0644);
 106 MODULE_PARM_DESC(nr_desc_prm, "number of descriptors (default: 0)");
 107 
 108 enum hidma_cap {
 109         HIDMA_MSI_CAP = 1,
 110         HIDMA_IDENTITY_CAP,
 111 };
 112 
 113 /* process completed descriptors */
 114 static void hidma_process_completed(struct hidma_chan *mchan)
 115 {
 116         struct dma_device *ddev = mchan->chan.device;
 117         struct hidma_dev *mdma = to_hidma_dev(ddev);
 118         struct dma_async_tx_descriptor *desc;
 119         dma_cookie_t last_cookie;
 120         struct hidma_desc *mdesc;
 121         struct hidma_desc *next;
 122         unsigned long irqflags;
 123         struct list_head list;
 124 
 125         INIT_LIST_HEAD(&list);
 126 
 127         /* Get all completed descriptors */
 128         spin_lock_irqsave(&mchan->lock, irqflags);
 129         list_splice_tail_init(&mchan->completed, &list);
 130         spin_unlock_irqrestore(&mchan->lock, irqflags);
 131 
 132         /* Execute callbacks and run dependencies */
 133         list_for_each_entry_safe(mdesc, next, &list, node) {
 134                 enum dma_status llstat;
 135                 struct dmaengine_desc_callback cb;
 136                 struct dmaengine_result result;
 137 
 138                 desc = &mdesc->desc;
 139                 last_cookie = desc->cookie;
 140 
 141                 llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch);
 142 
 143                 spin_lock_irqsave(&mchan->lock, irqflags);
 144                 if (llstat == DMA_COMPLETE) {
 145                         mchan->last_success = last_cookie;
 146                         result.result = DMA_TRANS_NOERROR;
 147                 } else {
 148                         result.result = DMA_TRANS_ABORTED;
 149                 }
 150 
 151                 dma_cookie_complete(desc);
 152                 spin_unlock_irqrestore(&mchan->lock, irqflags);
 153 
 154                 dmaengine_desc_get_callback(desc, &cb);
 155 
 156                 dma_run_dependencies(desc);
 157 
 158                 spin_lock_irqsave(&mchan->lock, irqflags);
 159                 list_move(&mdesc->node, &mchan->free);
 160                 spin_unlock_irqrestore(&mchan->lock, irqflags);
 161 
 162                 dmaengine_desc_callback_invoke(&cb, &result);
 163         }
 164 }
 165 
 166 /*
 167  * Called once for each submitted descriptor.
 168  * PM is locked once for each descriptor that is currently
 169  * in execution.
 170  */
 171 static void hidma_callback(void *data)
 172 {
 173         struct hidma_desc *mdesc = data;
 174         struct hidma_chan *mchan = to_hidma_chan(mdesc->desc.chan);
 175         struct dma_device *ddev = mchan->chan.device;
 176         struct hidma_dev *dmadev = to_hidma_dev(ddev);
 177         unsigned long irqflags;
 178         bool queued = false;
 179 
 180         spin_lock_irqsave(&mchan->lock, irqflags);
 181         if (mdesc->node.next) {
 182                 /* Delete from the active list, add to completed list */
 183                 list_move_tail(&mdesc->node, &mchan->completed);
 184                 queued = true;
 185 
 186                 /* calculate the next running descriptor */
 187                 mchan->running = list_first_entry(&mchan->active,
 188                                                   struct hidma_desc, node);
 189         }
 190         spin_unlock_irqrestore(&mchan->lock, irqflags);
 191 
 192         hidma_process_completed(mchan);
 193 
 194         if (queued) {
 195                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 196                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 197         }
 198 }
 199 
 200 static int hidma_chan_init(struct hidma_dev *dmadev, u32 dma_sig)
 201 {
 202         struct hidma_chan *mchan;
 203         struct dma_device *ddev;
 204 
 205         mchan = devm_kzalloc(dmadev->ddev.dev, sizeof(*mchan), GFP_KERNEL);
 206         if (!mchan)
 207                 return -ENOMEM;
 208 
 209         ddev = &dmadev->ddev;
 210         mchan->dma_sig = dma_sig;
 211         mchan->dmadev = dmadev;
 212         mchan->chan.device = ddev;
 213         dma_cookie_init(&mchan->chan);
 214 
 215         INIT_LIST_HEAD(&mchan->free);
 216         INIT_LIST_HEAD(&mchan->prepared);
 217         INIT_LIST_HEAD(&mchan->active);
 218         INIT_LIST_HEAD(&mchan->completed);
 219         INIT_LIST_HEAD(&mchan->queued);
 220 
 221         spin_lock_init(&mchan->lock);
 222         list_add_tail(&mchan->chan.device_node, &ddev->channels);
 223         dmadev->ddev.chancnt++;
 224         return 0;
 225 }
 226 
 227 static void hidma_issue_task(unsigned long arg)
 228 {
 229         struct hidma_dev *dmadev = (struct hidma_dev *)arg;
 230 
 231         pm_runtime_get_sync(dmadev->ddev.dev);
 232         hidma_ll_start(dmadev->lldev);
 233 }
 234 
 235 static void hidma_issue_pending(struct dma_chan *dmach)
 236 {
 237         struct hidma_chan *mchan = to_hidma_chan(dmach);
 238         struct hidma_dev *dmadev = mchan->dmadev;
 239         unsigned long flags;
 240         struct hidma_desc *qdesc, *next;
 241         int status;
 242 
 243         spin_lock_irqsave(&mchan->lock, flags);
 244         list_for_each_entry_safe(qdesc, next, &mchan->queued, node) {
 245                 hidma_ll_queue_request(dmadev->lldev, qdesc->tre_ch);
 246                 list_move_tail(&qdesc->node, &mchan->active);
 247         }
 248 
 249         if (!mchan->running) {
 250                 struct hidma_desc *desc = list_first_entry(&mchan->active,
 251                                                            struct hidma_desc,
 252                                                            node);
 253                 mchan->running = desc;
 254         }
 255         spin_unlock_irqrestore(&mchan->lock, flags);
 256 
 257         /* PM will be released in hidma_callback function. */
 258         status = pm_runtime_get(dmadev->ddev.dev);
 259         if (status < 0)
 260                 tasklet_schedule(&dmadev->task);
 261         else
 262                 hidma_ll_start(dmadev->lldev);
 263 }
 264 
 265 static inline bool hidma_txn_is_success(dma_cookie_t cookie,
 266                 dma_cookie_t last_success, dma_cookie_t last_used)
 267 {
 268         if (last_success <= last_used) {
 269                 if ((cookie <= last_success) || (cookie > last_used))
 270                         return true;
 271         } else {
 272                 if ((cookie <= last_success) && (cookie > last_used))
 273                         return true;
 274         }
 275         return false;
 276 }
 277 
 278 static enum dma_status hidma_tx_status(struct dma_chan *dmach,
 279                                        dma_cookie_t cookie,
 280                                        struct dma_tx_state *txstate)
 281 {
 282         struct hidma_chan *mchan = to_hidma_chan(dmach);
 283         enum dma_status ret;
 284 
 285         ret = dma_cookie_status(dmach, cookie, txstate);
 286         if (ret == DMA_COMPLETE) {
 287                 bool is_success;
 288 
 289                 is_success = hidma_txn_is_success(cookie, mchan->last_success,
 290                                                   dmach->cookie);
 291                 return is_success ? ret : DMA_ERROR;
 292         }
 293 
 294         if (mchan->paused && (ret == DMA_IN_PROGRESS)) {
 295                 unsigned long flags;
 296                 dma_cookie_t runcookie;
 297 
 298                 spin_lock_irqsave(&mchan->lock, flags);
 299                 if (mchan->running)
 300                         runcookie = mchan->running->desc.cookie;
 301                 else
 302                         runcookie = -EINVAL;
 303 
 304                 if (runcookie == cookie)
 305                         ret = DMA_PAUSED;
 306 
 307                 spin_unlock_irqrestore(&mchan->lock, flags);
 308         }
 309 
 310         return ret;
 311 }
 312 
 313 /*
 314  * Submit descriptor to hardware.
 315  * Lock the PM for each descriptor we are sending.
 316  */
 317 static dma_cookie_t hidma_tx_submit(struct dma_async_tx_descriptor *txd)
 318 {
 319         struct hidma_chan *mchan = to_hidma_chan(txd->chan);
 320         struct hidma_dev *dmadev = mchan->dmadev;
 321         struct hidma_desc *mdesc;
 322         unsigned long irqflags;
 323         dma_cookie_t cookie;
 324 
 325         pm_runtime_get_sync(dmadev->ddev.dev);
 326         if (!hidma_ll_isenabled(dmadev->lldev)) {
 327                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 328                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 329                 return -ENODEV;
 330         }
 331         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 332         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 333 
 334         mdesc = container_of(txd, struct hidma_desc, desc);
 335         spin_lock_irqsave(&mchan->lock, irqflags);
 336 
 337         /* Move descriptor to queued */
 338         list_move_tail(&mdesc->node, &mchan->queued);
 339 
 340         /* Update cookie */
 341         cookie = dma_cookie_assign(txd);
 342 
 343         spin_unlock_irqrestore(&mchan->lock, irqflags);
 344 
 345         return cookie;
 346 }
 347 
 348 static int hidma_alloc_chan_resources(struct dma_chan *dmach)
 349 {
 350         struct hidma_chan *mchan = to_hidma_chan(dmach);
 351         struct hidma_dev *dmadev = mchan->dmadev;
 352         struct hidma_desc *mdesc, *tmp;
 353         unsigned long irqflags;
 354         LIST_HEAD(descs);
 355         unsigned int i;
 356         int rc = 0;
 357 
 358         if (mchan->allocated)
 359                 return 0;
 360 
 361         /* Alloc descriptors for this channel */
 362         for (i = 0; i < dmadev->nr_descriptors; i++) {
 363                 mdesc = kzalloc(sizeof(struct hidma_desc), GFP_NOWAIT);
 364                 if (!mdesc) {
 365                         rc = -ENOMEM;
 366                         break;
 367                 }
 368                 dma_async_tx_descriptor_init(&mdesc->desc, dmach);
 369                 mdesc->desc.tx_submit = hidma_tx_submit;
 370 
 371                 rc = hidma_ll_request(dmadev->lldev, mchan->dma_sig,
 372                                       "DMA engine", hidma_callback, mdesc,
 373                                       &mdesc->tre_ch);
 374                 if (rc) {
 375                         dev_err(dmach->device->dev,
 376                                 "channel alloc failed at %u\n", i);
 377                         kfree(mdesc);
 378                         break;
 379                 }
 380                 list_add_tail(&mdesc->node, &descs);
 381         }
 382 
 383         if (rc) {
 384                 /* return the allocated descriptors */
 385                 list_for_each_entry_safe(mdesc, tmp, &descs, node) {
 386                         hidma_ll_free(dmadev->lldev, mdesc->tre_ch);
 387                         kfree(mdesc);
 388                 }
 389                 return rc;
 390         }
 391 
 392         spin_lock_irqsave(&mchan->lock, irqflags);
 393         list_splice_tail_init(&descs, &mchan->free);
 394         mchan->allocated = true;
 395         spin_unlock_irqrestore(&mchan->lock, irqflags);
 396         return 1;
 397 }
 398 
 399 static struct dma_async_tx_descriptor *
 400 hidma_prep_dma_memcpy(struct dma_chan *dmach, dma_addr_t dest, dma_addr_t src,
 401                 size_t len, unsigned long flags)
 402 {
 403         struct hidma_chan *mchan = to_hidma_chan(dmach);
 404         struct hidma_desc *mdesc = NULL;
 405         struct hidma_dev *mdma = mchan->dmadev;
 406         unsigned long irqflags;
 407 
 408         /* Get free descriptor */
 409         spin_lock_irqsave(&mchan->lock, irqflags);
 410         if (!list_empty(&mchan->free)) {
 411                 mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
 412                 list_del(&mdesc->node);
 413         }
 414         spin_unlock_irqrestore(&mchan->lock, irqflags);
 415 
 416         if (!mdesc)
 417                 return NULL;
 418 
 419         mdesc->desc.flags = flags;
 420         hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
 421                                      src, dest, len, flags,
 422                                      HIDMA_TRE_MEMCPY);
 423 
 424         /* Place descriptor in prepared list */
 425         spin_lock_irqsave(&mchan->lock, irqflags);
 426         list_add_tail(&mdesc->node, &mchan->prepared);
 427         spin_unlock_irqrestore(&mchan->lock, irqflags);
 428 
 429         return &mdesc->desc;
 430 }
 431 
 432 static struct dma_async_tx_descriptor *
 433 hidma_prep_dma_memset(struct dma_chan *dmach, dma_addr_t dest, int value,
 434                 size_t len, unsigned long flags)
 435 {
 436         struct hidma_chan *mchan = to_hidma_chan(dmach);
 437         struct hidma_desc *mdesc = NULL;
 438         struct hidma_dev *mdma = mchan->dmadev;
 439         unsigned long irqflags;
 440 
 441         /* Get free descriptor */
 442         spin_lock_irqsave(&mchan->lock, irqflags);
 443         if (!list_empty(&mchan->free)) {
 444                 mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
 445                 list_del(&mdesc->node);
 446         }
 447         spin_unlock_irqrestore(&mchan->lock, irqflags);
 448 
 449         if (!mdesc)
 450                 return NULL;
 451 
 452         mdesc->desc.flags = flags;
 453         hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
 454                                      value, dest, len, flags,
 455                                      HIDMA_TRE_MEMSET);
 456 
 457         /* Place descriptor in prepared list */
 458         spin_lock_irqsave(&mchan->lock, irqflags);
 459         list_add_tail(&mdesc->node, &mchan->prepared);
 460         spin_unlock_irqrestore(&mchan->lock, irqflags);
 461 
 462         return &mdesc->desc;
 463 }
 464 
 465 static int hidma_terminate_channel(struct dma_chan *chan)
 466 {
 467         struct hidma_chan *mchan = to_hidma_chan(chan);
 468         struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
 469         struct hidma_desc *tmp, *mdesc;
 470         unsigned long irqflags;
 471         LIST_HEAD(list);
 472         int rc;
 473 
 474         pm_runtime_get_sync(dmadev->ddev.dev);
 475         /* give completed requests a chance to finish */
 476         hidma_process_completed(mchan);
 477 
 478         spin_lock_irqsave(&mchan->lock, irqflags);
 479         mchan->last_success = 0;
 480         list_splice_init(&mchan->active, &list);
 481         list_splice_init(&mchan->prepared, &list);
 482         list_splice_init(&mchan->completed, &list);
 483         list_splice_init(&mchan->queued, &list);
 484         spin_unlock_irqrestore(&mchan->lock, irqflags);
 485 
 486         /* this suspends the existing transfer */
 487         rc = hidma_ll_disable(dmadev->lldev);
 488         if (rc) {
 489                 dev_err(dmadev->ddev.dev, "channel did not pause\n");
 490                 goto out;
 491         }
 492 
 493         /* return all user requests */
 494         list_for_each_entry_safe(mdesc, tmp, &list, node) {
 495                 struct dma_async_tx_descriptor *txd = &mdesc->desc;
 496 
 497                 dma_descriptor_unmap(txd);
 498                 dmaengine_desc_get_callback_invoke(txd, NULL);
 499                 dma_run_dependencies(txd);
 500 
 501                 /* move myself to free_list */
 502                 list_move(&mdesc->node, &mchan->free);
 503         }
 504 
 505         rc = hidma_ll_enable(dmadev->lldev);
 506 out:
 507         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 508         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 509         return rc;
 510 }
 511 
 512 static int hidma_terminate_all(struct dma_chan *chan)
 513 {
 514         struct hidma_chan *mchan = to_hidma_chan(chan);
 515         struct hidma_dev *dmadev = to_hidma_dev(mchan->chan.device);
 516         int rc;
 517 
 518         rc = hidma_terminate_channel(chan);
 519         if (rc)
 520                 return rc;
 521 
 522         /* reinitialize the hardware */
 523         pm_runtime_get_sync(dmadev->ddev.dev);
 524         rc = hidma_ll_setup(dmadev->lldev);
 525         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 526         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 527         return rc;
 528 }
 529 
 530 static void hidma_free_chan_resources(struct dma_chan *dmach)
 531 {
 532         struct hidma_chan *mchan = to_hidma_chan(dmach);
 533         struct hidma_dev *mdma = mchan->dmadev;
 534         struct hidma_desc *mdesc, *tmp;
 535         unsigned long irqflags;
 536         LIST_HEAD(descs);
 537 
 538         /* terminate running transactions and free descriptors */
 539         hidma_terminate_channel(dmach);
 540 
 541         spin_lock_irqsave(&mchan->lock, irqflags);
 542 
 543         /* Move data */
 544         list_splice_tail_init(&mchan->free, &descs);
 545 
 546         /* Free descriptors */
 547         list_for_each_entry_safe(mdesc, tmp, &descs, node) {
 548                 hidma_ll_free(mdma->lldev, mdesc->tre_ch);
 549                 list_del(&mdesc->node);
 550                 kfree(mdesc);
 551         }
 552 
 553         mchan->allocated = 0;
 554         spin_unlock_irqrestore(&mchan->lock, irqflags);
 555 }
 556 
 557 static int hidma_pause(struct dma_chan *chan)
 558 {
 559         struct hidma_chan *mchan;
 560         struct hidma_dev *dmadev;
 561 
 562         mchan = to_hidma_chan(chan);
 563         dmadev = to_hidma_dev(mchan->chan.device);
 564         if (!mchan->paused) {
 565                 pm_runtime_get_sync(dmadev->ddev.dev);
 566                 if (hidma_ll_disable(dmadev->lldev))
 567                         dev_warn(dmadev->ddev.dev, "channel did not stop\n");
 568                 mchan->paused = true;
 569                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 570                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 571         }
 572         return 0;
 573 }
 574 
 575 static int hidma_resume(struct dma_chan *chan)
 576 {
 577         struct hidma_chan *mchan;
 578         struct hidma_dev *dmadev;
 579         int rc = 0;
 580 
 581         mchan = to_hidma_chan(chan);
 582         dmadev = to_hidma_dev(mchan->chan.device);
 583         if (mchan->paused) {
 584                 pm_runtime_get_sync(dmadev->ddev.dev);
 585                 rc = hidma_ll_enable(dmadev->lldev);
 586                 if (!rc)
 587                         mchan->paused = false;
 588                 else
 589                         dev_err(dmadev->ddev.dev,
 590                                 "failed to resume the channel");
 591                 pm_runtime_mark_last_busy(dmadev->ddev.dev);
 592                 pm_runtime_put_autosuspend(dmadev->ddev.dev);
 593         }
 594         return rc;
 595 }
 596 
 597 static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
 598 {
 599         struct hidma_lldev *lldev = arg;
 600 
 601         /*
 602          * All interrupts are request driven.
 603          * HW doesn't send an interrupt by itself.
 604          */
 605         return hidma_ll_inthandler(chirq, lldev);
 606 }
 607 
 608 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 609 static irqreturn_t hidma_chirq_handler_msi(int chirq, void *arg)
 610 {
 611         struct hidma_lldev **lldevp = arg;
 612         struct hidma_dev *dmadev = to_hidma_dev_from_lldev(lldevp);
 613 
 614         return hidma_ll_inthandler_msi(chirq, *lldevp,
 615                                        1 << (chirq - dmadev->msi_virqbase));
 616 }
 617 #endif
 618 
 619 static ssize_t hidma_show_values(struct device *dev,
 620                                  struct device_attribute *attr, char *buf)
 621 {
 622         struct hidma_dev *mdev = dev_get_drvdata(dev);
 623 
 624         buf[0] = 0;
 625 
 626         if (strcmp(attr->attr.name, "chid") == 0)
 627                 sprintf(buf, "%d\n", mdev->chidx);
 628 
 629         return strlen(buf);
 630 }
 631 
 632 static inline void  hidma_sysfs_uninit(struct hidma_dev *dev)
 633 {
 634         device_remove_file(dev->ddev.dev, dev->chid_attrs);
 635 }
 636 
 637 static struct device_attribute*
 638 hidma_create_sysfs_entry(struct hidma_dev *dev, char *name, int mode)
 639 {
 640         struct device_attribute *attrs;
 641         char *name_copy;
 642 
 643         attrs = devm_kmalloc(dev->ddev.dev, sizeof(struct device_attribute),
 644                              GFP_KERNEL);
 645         if (!attrs)
 646                 return NULL;
 647 
 648         name_copy = devm_kstrdup(dev->ddev.dev, name, GFP_KERNEL);
 649         if (!name_copy)
 650                 return NULL;
 651 
 652         attrs->attr.name = name_copy;
 653         attrs->attr.mode = mode;
 654         attrs->show = hidma_show_values;
 655         sysfs_attr_init(&attrs->attr);
 656 
 657         return attrs;
 658 }
 659 
 660 static int hidma_sysfs_init(struct hidma_dev *dev)
 661 {
 662         dev->chid_attrs = hidma_create_sysfs_entry(dev, "chid", S_IRUGO);
 663         if (!dev->chid_attrs)
 664                 return -ENOMEM;
 665 
 666         return device_create_file(dev->ddev.dev, dev->chid_attrs);
 667 }
 668 
 669 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 670 static void hidma_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
 671 {
 672         struct device *dev = msi_desc_to_dev(desc);
 673         struct hidma_dev *dmadev = dev_get_drvdata(dev);
 674 
 675         if (!desc->platform.msi_index) {
 676                 writel(msg->address_lo, dmadev->dev_evca + 0x118);
 677                 writel(msg->address_hi, dmadev->dev_evca + 0x11C);
 678                 writel(msg->data, dmadev->dev_evca + 0x120);
 679         }
 680 }
 681 #endif
 682 
 683 static void hidma_free_msis(struct hidma_dev *dmadev)
 684 {
 685 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 686         struct device *dev = dmadev->ddev.dev;
 687         struct msi_desc *desc;
 688 
 689         /* free allocated MSI interrupts above */
 690         for_each_msi_entry(desc, dev)
 691                 devm_free_irq(dev, desc->irq, &dmadev->lldev);
 692 
 693         platform_msi_domain_free_irqs(dev);
 694 #endif
 695 }
 696 
 697 static int hidma_request_msi(struct hidma_dev *dmadev,
 698                              struct platform_device *pdev)
 699 {
 700 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
 701         int rc;
 702         struct msi_desc *desc;
 703         struct msi_desc *failed_desc = NULL;
 704 
 705         rc = platform_msi_domain_alloc_irqs(&pdev->dev, HIDMA_MSI_INTS,
 706                                             hidma_write_msi_msg);
 707         if (rc)
 708                 return rc;
 709 
 710         for_each_msi_entry(desc, &pdev->dev) {
 711                 if (!desc->platform.msi_index)
 712                         dmadev->msi_virqbase = desc->irq;
 713 
 714                 rc = devm_request_irq(&pdev->dev, desc->irq,
 715                                        hidma_chirq_handler_msi,
 716                                        0, "qcom-hidma-msi",
 717                                        &dmadev->lldev);
 718                 if (rc) {
 719                         failed_desc = desc;
 720                         break;
 721                 }
 722         }
 723 
 724         if (rc) {
 725                 /* free allocated MSI interrupts above */
 726                 for_each_msi_entry(desc, &pdev->dev) {
 727                         if (desc == failed_desc)
 728                                 break;
 729                         devm_free_irq(&pdev->dev, desc->irq,
 730                                       &dmadev->lldev);
 731                 }
 732         } else {
 733                 /* Add callback to free MSIs on teardown */
 734                 hidma_ll_setup_irq(dmadev->lldev, true);
 735 
 736         }
 737         if (rc)
 738                 dev_warn(&pdev->dev,
 739                          "failed to request MSI irq, falling back to wired IRQ\n");
 740         return rc;
 741 #else
 742         return -EINVAL;
 743 #endif
 744 }
 745 
 746 static bool hidma_test_capability(struct device *dev, enum hidma_cap test_cap)
 747 {
 748         enum hidma_cap cap;
 749 
 750         cap = (enum hidma_cap) device_get_match_data(dev);
 751         return cap ? ((cap & test_cap) > 0) : 0;
 752 }
 753 
 754 static int hidma_probe(struct platform_device *pdev)
 755 {
 756         struct hidma_dev *dmadev;
 757         struct resource *trca_resource;
 758         struct resource *evca_resource;
 759         int chirq;
 760         void __iomem *evca;
 761         void __iomem *trca;
 762         int rc;
 763         bool msi;
 764 
 765         pm_runtime_set_autosuspend_delay(&pdev->dev, HIDMA_AUTOSUSPEND_TIMEOUT);
 766         pm_runtime_use_autosuspend(&pdev->dev);
 767         pm_runtime_set_active(&pdev->dev);
 768         pm_runtime_enable(&pdev->dev);
 769 
 770         trca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 771         trca = devm_ioremap_resource(&pdev->dev, trca_resource);
 772         if (IS_ERR(trca)) {
 773                 rc = -ENOMEM;
 774                 goto bailout;
 775         }
 776 
 777         evca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 778         evca = devm_ioremap_resource(&pdev->dev, evca_resource);
 779         if (IS_ERR(evca)) {
 780                 rc = -ENOMEM;
 781                 goto bailout;
 782         }
 783 
 784         /*
 785          * This driver only handles the channel IRQs.
 786          * Common IRQ is handled by the management driver.
 787          */
 788         chirq = platform_get_irq(pdev, 0);
 789         if (chirq < 0) {
 790                 rc = -ENODEV;
 791                 goto bailout;
 792         }
 793 
 794         dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
 795         if (!dmadev) {
 796                 rc = -ENOMEM;
 797                 goto bailout;
 798         }
 799 
 800         INIT_LIST_HEAD(&dmadev->ddev.channels);
 801         spin_lock_init(&dmadev->lock);
 802         dmadev->ddev.dev = &pdev->dev;
 803         pm_runtime_get_sync(dmadev->ddev.dev);
 804 
 805         dma_cap_set(DMA_MEMCPY, dmadev->ddev.cap_mask);
 806         dma_cap_set(DMA_MEMSET, dmadev->ddev.cap_mask);
 807         if (WARN_ON(!pdev->dev.dma_mask)) {
 808                 rc = -ENXIO;
 809                 goto dmafree;
 810         }
 811 
 812         dmadev->dev_evca = evca;
 813         dmadev->evca_resource = evca_resource;
 814         dmadev->dev_trca = trca;
 815         dmadev->trca_resource = trca_resource;
 816         dmadev->ddev.device_prep_dma_memcpy = hidma_prep_dma_memcpy;
 817         dmadev->ddev.device_prep_dma_memset = hidma_prep_dma_memset;
 818         dmadev->ddev.device_alloc_chan_resources = hidma_alloc_chan_resources;
 819         dmadev->ddev.device_free_chan_resources = hidma_free_chan_resources;
 820         dmadev->ddev.device_tx_status = hidma_tx_status;
 821         dmadev->ddev.device_issue_pending = hidma_issue_pending;
 822         dmadev->ddev.device_pause = hidma_pause;
 823         dmadev->ddev.device_resume = hidma_resume;
 824         dmadev->ddev.device_terminate_all = hidma_terminate_all;
 825         dmadev->ddev.copy_align = 8;
 826 
 827         /*
 828          * Determine the MSI capability of the platform. Old HW doesn't
 829          * support MSI.
 830          */
 831         msi = hidma_test_capability(&pdev->dev, HIDMA_MSI_CAP);
 832         device_property_read_u32(&pdev->dev, "desc-count",
 833                                  &dmadev->nr_descriptors);
 834 
 835         if (nr_desc_prm) {
 836                 dev_info(&pdev->dev, "overriding number of descriptors as %d\n",
 837                          nr_desc_prm);
 838                 dmadev->nr_descriptors = nr_desc_prm;
 839         }
 840 
 841         if (!dmadev->nr_descriptors)
 842                 dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;
 843 
 844         if (hidma_test_capability(&pdev->dev, HIDMA_IDENTITY_CAP))
 845                 dmadev->chidx = readl(dmadev->dev_trca + 0x40);
 846         else
 847                 dmadev->chidx = readl(dmadev->dev_trca + 0x28);
 848 
 849         /* Set DMA mask to 64 bits. */
 850         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 851         if (rc) {
 852                 dev_warn(&pdev->dev, "unable to set coherent mask to 64");
 853                 rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 854                 if (rc)
 855                         goto dmafree;
 856         }
 857 
 858         dmadev->lldev = hidma_ll_init(dmadev->ddev.dev,
 859                                       dmadev->nr_descriptors, dmadev->dev_trca,
 860                                       dmadev->dev_evca, dmadev->chidx);
 861         if (!dmadev->lldev) {
 862                 rc = -EPROBE_DEFER;
 863                 goto dmafree;
 864         }
 865 
 866         platform_set_drvdata(pdev, dmadev);
 867         if (msi)
 868                 rc = hidma_request_msi(dmadev, pdev);
 869 
 870         if (!msi || rc) {
 871                 hidma_ll_setup_irq(dmadev->lldev, false);
 872                 rc = devm_request_irq(&pdev->dev, chirq, hidma_chirq_handler,
 873                                       0, "qcom-hidma", dmadev->lldev);
 874                 if (rc)
 875                         goto uninit;
 876         }
 877 
 878         INIT_LIST_HEAD(&dmadev->ddev.channels);
 879         rc = hidma_chan_init(dmadev, 0);
 880         if (rc)
 881                 goto uninit;
 882 
 883         rc = dma_async_device_register(&dmadev->ddev);
 884         if (rc)
 885                 goto uninit;
 886 
 887         dmadev->irq = chirq;
 888         tasklet_init(&dmadev->task, hidma_issue_task, (unsigned long)dmadev);
 889         hidma_debug_init(dmadev);
 890         hidma_sysfs_init(dmadev);
 891         dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
 892         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 893         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 894         return 0;
 895 
 896 uninit:
 897         if (msi)
 898                 hidma_free_msis(dmadev);
 899 
 900         hidma_debug_uninit(dmadev);
 901         hidma_ll_uninit(dmadev->lldev);
 902 dmafree:
 903         if (dmadev)
 904                 hidma_free(dmadev);
 905 bailout:
 906         pm_runtime_put_sync(&pdev->dev);
 907         pm_runtime_disable(&pdev->dev);
 908         return rc;
 909 }
 910 
 911 static void hidma_shutdown(struct platform_device *pdev)
 912 {
 913         struct hidma_dev *dmadev = platform_get_drvdata(pdev);
 914 
 915         dev_info(dmadev->ddev.dev, "HI-DMA engine shutdown\n");
 916 
 917         pm_runtime_get_sync(dmadev->ddev.dev);
 918         if (hidma_ll_disable(dmadev->lldev))
 919                 dev_warn(dmadev->ddev.dev, "channel did not stop\n");
 920         pm_runtime_mark_last_busy(dmadev->ddev.dev);
 921         pm_runtime_put_autosuspend(dmadev->ddev.dev);
 922 
 923 }
 924 
 925 static int hidma_remove(struct platform_device *pdev)
 926 {
 927         struct hidma_dev *dmadev = platform_get_drvdata(pdev);
 928 
 929         pm_runtime_get_sync(dmadev->ddev.dev);
 930         dma_async_device_unregister(&dmadev->ddev);
 931         if (!dmadev->lldev->msi_support)
 932                 devm_free_irq(dmadev->ddev.dev, dmadev->irq, dmadev->lldev);
 933         else
 934                 hidma_free_msis(dmadev);
 935 
 936         tasklet_kill(&dmadev->task);
 937         hidma_sysfs_uninit(dmadev);
 938         hidma_debug_uninit(dmadev);
 939         hidma_ll_uninit(dmadev->lldev);
 940         hidma_free(dmadev);
 941 
 942         dev_info(&pdev->dev, "HI-DMA engine removed\n");
 943         pm_runtime_put_sync_suspend(&pdev->dev);
 944         pm_runtime_disable(&pdev->dev);
 945 
 946         return 0;
 947 }
 948 
 949 #if IS_ENABLED(CONFIG_ACPI)
 950 static const struct acpi_device_id hidma_acpi_ids[] = {
 951         {"QCOM8061"},
 952         {"QCOM8062", HIDMA_MSI_CAP},
 953         {"QCOM8063", (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP)},
 954         {},
 955 };
 956 MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
 957 #endif
 958 
 959 static const struct of_device_id hidma_match[] = {
 960         {.compatible = "qcom,hidma-1.0",},
 961         {.compatible = "qcom,hidma-1.1", .data = (void *)(HIDMA_MSI_CAP),},
 962         {.compatible = "qcom,hidma-1.2",
 963          .data = (void *)(HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP),},
 964         {},
 965 };
 966 MODULE_DEVICE_TABLE(of, hidma_match);
 967 
 968 static struct platform_driver hidma_driver = {
 969         .probe = hidma_probe,
 970         .remove = hidma_remove,
 971         .shutdown = hidma_shutdown,
 972         .driver = {
 973                    .name = "hidma",
 974                    .of_match_table = hidma_match,
 975                    .acpi_match_table = ACPI_PTR(hidma_acpi_ids),
 976         },
 977 };
 978 
 979 module_platform_driver(hidma_driver);
 980 MODULE_LICENSE("GPL v2");