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