kernel/drivers/dma/idma64.c

   1 /*
   2  * Core driver for the Intel integrated DMA 64-bit
   3  *
   4  * Copyright (C) 2015 Intel Corporation
   5  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/bitops.h>
  13 #include <linux/delay.h>
  14 #include <linux/dmaengine.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/dmapool.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/slab.h>
  21
  22 #include "idma64.h"
  23
  24 /* Platform driver name */
  25 #define DRV_NAME                "idma64"
  26
  27 /* For now we support only two channels */
  28 #define IDMA64_NR_CHAN          2
  29
  30 /* ---------------------------------------------------------------------- */
  31
  32 static struct device *chan2dev(struct dma_chan *chan)
  33 {
  34         return &chan->dev->device;
  35 }
  36
  37 /* ---------------------------------------------------------------------- */
  38
  39 static void idma64_off(struct idma64 *idma64)
  40 {
  41         unsigned short count = 100;
  42
  43         dma_writel(idma64, CFG, 0);
  44
  45         channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
  46         channel_clear_bit(idma64, MASK(BLOCK), idma64->all_chan_mask);
  47         channel_clear_bit(idma64, MASK(SRC_TRAN), idma64->all_chan_mask);
  48         channel_clear_bit(idma64, MASK(DST_TRAN), idma64->all_chan_mask);
  49         channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
  50
  51         do {
  52                 cpu_relax();
  53         } while (dma_readl(idma64, CFG) & IDMA64_CFG_DMA_EN && --count);
  54 }
  55
  56 static void idma64_on(struct idma64 *idma64)
  57 {
  58         dma_writel(idma64, CFG, IDMA64_CFG_DMA_EN);
  59 }
  60
  61 /* ---------------------------------------------------------------------- */
  62
  63 static void idma64_chan_init(struct idma64 *idma64, struct idma64_chan *idma64c)
  64 {
  65         u32 cfghi = IDMA64C_CFGH_SRC_PER(1) | IDMA64C_CFGH_DST_PER(0);
  66         u32 cfglo = 0;
  67
  68         /* Set default burst alignment */
  69         cfglo |= IDMA64C_CFGL_DST_BURST_ALIGN | IDMA64C_CFGL_SRC_BURST_ALIGN;
  70
  71         channel_writel(idma64c, CFG_LO, cfglo);
  72         channel_writel(idma64c, CFG_HI, cfghi);
  73
  74         /* Enable interrupts */
  75         channel_set_bit(idma64, MASK(XFER), idma64c->mask);
  76         channel_set_bit(idma64, MASK(ERROR), idma64c->mask);
  77
  78         /*
  79          * Enforce the controller to be turned on.
  80          *
  81          * The iDMA is turned off in ->probe() and looses context during system
  82          * suspend / resume cycle. That's why we have to enable it each time we
  83          * use it.
  84          */
  85         idma64_on(idma64);
  86 }
  87
  88 static void idma64_chan_stop(struct idma64 *idma64, struct idma64_chan *idma64c)
  89 {
  90         channel_clear_bit(idma64, CH_EN, idma64c->mask);
  91 }
  92
  93 static void idma64_chan_start(struct idma64 *idma64, struct idma64_chan *idma64c)
  94 {
  95         struct idma64_desc *desc = idma64c->desc;
  96         struct idma64_hw_desc *hw = &desc->hw[0];
  97
  98         channel_writeq(idma64c, SAR, 0);
  99         channel_writeq(idma64c, DAR, 0);
 100
 101         channel_writel(idma64c, CTL_HI, IDMA64C_CTLH_BLOCK_TS(~0UL));
 102         channel_writel(idma64c, CTL_LO, IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
 103
 104         channel_writeq(idma64c, LLP, hw->llp);
 105
 106         channel_set_bit(idma64, CH_EN, idma64c->mask);
 107 }
 108
 109 static void idma64_stop_transfer(struct idma64_chan *idma64c)
 110 {
 111         struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
 112
 113         idma64_chan_stop(idma64, idma64c);
 114 }
 115
 116 static void idma64_start_transfer(struct idma64_chan *idma64c)
 117 {
 118         struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
 119         struct virt_dma_desc *vdesc;
 120
 121         /* Get the next descriptor */
 122         vdesc = vchan_next_desc(&idma64c->vchan);
 123         if (!vdesc) {
 124                 idma64c->desc = NULL;
 125                 return;
 126         }
 127
 128         list_del(&vdesc->node);
 129         idma64c->desc = to_idma64_desc(vdesc);
 130
 131         /* Configure the channel */
 132         idma64_chan_init(idma64, idma64c);
 133
 134         /* Start the channel with a new descriptor */
 135         idma64_chan_start(idma64, idma64c);
 136 }
 137
 138 /* ---------------------------------------------------------------------- */
 139
 140 static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 141                 u32 status_err, u32 status_xfer)
 142 {
 143         struct idma64_chan *idma64c = &idma64->chan[c];
 144         struct idma64_desc *desc;
 145         unsigned long flags;
 146
 147         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 148         desc = idma64c->desc;
 149         if (desc) {
 150                 if (status_err & (1 << c)) {
 151                         dma_writel(idma64, CLEAR(ERROR), idma64c->mask);
 152                         desc->status = DMA_ERROR;
 153                 } else if (status_xfer & (1 << c)) {
 154                         dma_writel(idma64, CLEAR(XFER), idma64c->mask);
 155                         desc->status = DMA_COMPLETE;
 156                         vchan_cookie_complete(&desc->vdesc);
 157                         idma64_start_transfer(idma64c);
 158                 }
 159
 160                 /* idma64_start_transfer() updates idma64c->desc */
 161                 if (idma64c->desc == NULL || desc->status == DMA_ERROR)
 162                         idma64_stop_transfer(idma64c);
 163         }
 164         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 165 }
 166
 167 static irqreturn_t idma64_irq(int irq, void *dev)
 168 {
 169         struct idma64 *idma64 = dev;
 170         u32 status = dma_readl(idma64, STATUS_INT);
 171         u32 status_xfer;
 172         u32 status_err;
 173         unsigned short i;
 174
 175         dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
 176
 177         /* Check if we have any interrupt from the DMA controller */
 178         if (!status)
 179                 return IRQ_NONE;
 180
 181         /* Disable interrupts */
 182         channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
 183         channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
 184
 185         status_xfer = dma_readl(idma64, RAW(XFER));
 186         status_err = dma_readl(idma64, RAW(ERROR));
 187
 188         for (i = 0; i < idma64->dma.chancnt; i++)
 189                 idma64_chan_irq(idma64, i, status_err, status_xfer);
 190
 191         /* Re-enable interrupts */
 192         channel_set_bit(idma64, MASK(XFER), idma64->all_chan_mask);
 193         channel_set_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
 194
 195         return IRQ_HANDLED;
 196 }
 197
 198 /* ---------------------------------------------------------------------- */
 199
 200 static struct idma64_desc *idma64_alloc_desc(unsigned int ndesc)
 201 {
 202         struct idma64_desc *desc;
 203
 204         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 205         if (!desc)
 206                 return NULL;
 207
 208         desc->hw = kcalloc(ndesc, sizeof(*desc->hw), GFP_NOWAIT);
 209         if (!desc->hw) {
 210                 kfree(desc);
 211                 return NULL;
 212         }
 213
 214         return desc;
 215 }
 216
 217 static void idma64_desc_free(struct idma64_chan *idma64c,
 218                 struct idma64_desc *desc)
 219 {
 220         struct idma64_hw_desc *hw;
 221
 222         if (desc->ndesc) {
 223                 unsigned int i = desc->ndesc;
 224
 225                 do {
 226                         hw = &desc->hw[--i];
 227                         dma_pool_free(idma64c->pool, hw->lli, hw->llp);
 228                 } while (i);
 229         }
 230
 231         kfree(desc->hw);
 232         kfree(desc);
 233 }
 234
 235 static void idma64_vdesc_free(struct virt_dma_desc *vdesc)
 236 {
 237         struct idma64_chan *idma64c = to_idma64_chan(vdesc->tx.chan);
 238
 239         idma64_desc_free(idma64c, to_idma64_desc(vdesc));
 240 }
 241
 242 static u64 idma64_hw_desc_fill(struct idma64_hw_desc *hw,
 243                 struct dma_slave_config *config,
 244                 enum dma_transfer_direction direction, u64 llp)
 245 {
 246         struct idma64_lli *lli = hw->lli;
 247         u64 sar, dar;
 248         u32 ctlhi = IDMA64C_CTLH_BLOCK_TS(hw->len);
 249         u32 ctllo = IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN;
 250         u32 src_width, dst_width;
 251
 252         if (direction == DMA_MEM_TO_DEV) {
 253                 sar = hw->phys;
 254                 dar = config->dst_addr;
 255                 ctllo |= IDMA64C_CTLL_DST_FIX | IDMA64C_CTLL_SRC_INC |
 256                          IDMA64C_CTLL_FC_M2P;
 257                 src_width = __ffs(sar | hw->len | 4);
 258                 dst_width = __ffs(config->dst_addr_width);
 259         } else {        /* DMA_DEV_TO_MEM */
 260                 sar = config->src_addr;
 261                 dar = hw->phys;
 262                 ctllo |= IDMA64C_CTLL_DST_INC | IDMA64C_CTLL_SRC_FIX |
 263                          IDMA64C_CTLL_FC_P2M;
 264                 src_width = __ffs(config->src_addr_width);
 265                 dst_width = __ffs(dar | hw->len | 4);
 266         }
 267
 268         lli->sar = sar;
 269         lli->dar = dar;
 270
 271         lli->ctlhi = ctlhi;
 272         lli->ctllo = ctllo |
 273                      IDMA64C_CTLL_SRC_MSIZE(config->src_maxburst) |
 274                      IDMA64C_CTLL_DST_MSIZE(config->dst_maxburst) |
 275                      IDMA64C_CTLL_DST_WIDTH(dst_width) |
 276                      IDMA64C_CTLL_SRC_WIDTH(src_width);
 277
 278         lli->llp = llp;
 279         return hw->llp;
 280 }
 281
 282 static void idma64_desc_fill(struct idma64_chan *idma64c,
 283                 struct idma64_desc *desc)
 284 {
 285         struct dma_slave_config *config = &idma64c->config;
 286         struct idma64_hw_desc *hw = &desc->hw[desc->ndesc - 1];
 287         struct idma64_lli *lli = hw->lli;
 288         u64 llp = 0;
 289         unsigned int i = desc->ndesc;
 290
 291         /* Fill the hardware descriptors and link them to a list */
 292         do {
 293                 hw = &desc->hw[--i];
 294                 llp = idma64_hw_desc_fill(hw, config, desc->direction, llp);
 295                 desc->length += hw->len;
 296         } while (i);
 297
 298         /* Trigger interrupt after last block */
 299         lli->ctllo |= IDMA64C_CTLL_INT_EN;
 300 }
 301
 302 static struct dma_async_tx_descriptor *idma64_prep_slave_sg(
 303                 struct dma_chan *chan, struct scatterlist *sgl,
 304                 unsigned int sg_len, enum dma_transfer_direction direction,
 305                 unsigned long flags, void *context)
 306 {
 307         struct idma64_chan *idma64c = to_idma64_chan(chan);
 308         struct idma64_desc *desc;
 309         struct scatterlist *sg;
 310         unsigned int i;
 311
 312         desc = idma64_alloc_desc(sg_len);
 313         if (!desc)
 314                 return NULL;
 315
 316         for_each_sg(sgl, sg, sg_len, i) {
 317                 struct idma64_hw_desc *hw = &desc->hw[i];
 318
 319                 /* Allocate DMA capable memory for hardware descriptor */
 320                 hw->lli = dma_pool_alloc(idma64c->pool, GFP_NOWAIT, &hw->llp);
 321                 if (!hw->lli) {
 322                         desc->ndesc = i;
 323                         idma64_desc_free(idma64c, desc);
 324                         return NULL;
 325                 }
 326
 327                 hw->phys = sg_dma_address(sg);
 328                 hw->len = sg_dma_len(sg);
 329         }
 330
 331         desc->ndesc = sg_len;
 332         desc->direction = direction;
 333         desc->status = DMA_IN_PROGRESS;
 334
 335         idma64_desc_fill(idma64c, desc);
 336         return vchan_tx_prep(&idma64c->vchan, &desc->vdesc, flags);
 337 }
 338
 339 static void idma64_issue_pending(struct dma_chan *chan)
 340 {
 341         struct idma64_chan *idma64c = to_idma64_chan(chan);
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 345         if (vchan_issue_pending(&idma64c->vchan) && !idma64c->desc)
 346                 idma64_start_transfer(idma64c);
 347         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 348 }
 349
 350 static size_t idma64_active_desc_size(struct idma64_chan *idma64c)
 351 {
 352         struct idma64_desc *desc = idma64c->desc;
 353         struct idma64_hw_desc *hw;
 354         size_t bytes = desc->length;
 355         u64 llp = channel_readq(idma64c, LLP);
 356         u32 ctlhi = channel_readl(idma64c, CTL_HI);
 357         unsigned int i = 0;
 358
 359         do {
 360                 hw = &desc->hw[i];
 361                 if (hw->llp == llp)
 362                         break;
 363                 bytes -= hw->len;
 364         } while (++i < desc->ndesc);
 365
 366         if (!i)
 367                 return bytes;
 368
 369         /* The current chunk is not fully transfered yet */
 370         bytes += desc->hw[--i].len;
 371
 372         return bytes - IDMA64C_CTLH_BLOCK_TS(ctlhi);
 373 }
 374
 375 static enum dma_status idma64_tx_status(struct dma_chan *chan,
 376                 dma_cookie_t cookie, struct dma_tx_state *state)
 377 {
 378         struct idma64_chan *idma64c = to_idma64_chan(chan);
 379         struct virt_dma_desc *vdesc;
 380         enum dma_status status;
 381         size_t bytes;
 382         unsigned long flags;
 383
 384         status = dma_cookie_status(chan, cookie, state);
 385         if (status == DMA_COMPLETE)
 386                 return status;
 387
 388         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 389         vdesc = vchan_find_desc(&idma64c->vchan, cookie);
 390         if (idma64c->desc && cookie == idma64c->desc->vdesc.tx.cookie) {
 391                 bytes = idma64_active_desc_size(idma64c);
 392                 dma_set_residue(state, bytes);
 393                 status = idma64c->desc->status;
 394         } else if (vdesc) {
 395                 bytes = to_idma64_desc(vdesc)->length;
 396                 dma_set_residue(state, bytes);
 397         }
 398         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 399
 400         return status;
 401 }
 402
 403 static void convert_burst(u32 *maxburst)
 404 {
 405         if (*maxburst)
 406                 *maxburst = __fls(*maxburst);
 407         else
 408                 *maxburst = 0;
 409 }
 410
 411 static int idma64_slave_config(struct dma_chan *chan,
 412                 struct dma_slave_config *config)
 413 {
 414         struct idma64_chan *idma64c = to_idma64_chan(chan);
 415
 416         /* Check if chan will be configured for slave transfers */
 417         if (!is_slave_direction(config->direction))
 418                 return -EINVAL;
 419
 420         memcpy(&idma64c->config, config, sizeof(idma64c->config));
 421
 422         convert_burst(&idma64c->config.src_maxburst);
 423         convert_burst(&idma64c->config.dst_maxburst);
 424
 425         return 0;
 426 }
 427
 428 static void idma64_chan_deactivate(struct idma64_chan *idma64c, bool drain)
 429 {
 430         unsigned short count = 100;
 431         u32 cfglo;
 432
 433         cfglo = channel_readl(idma64c, CFG_LO);
 434         if (drain)
 435                 cfglo |= IDMA64C_CFGL_CH_DRAIN;
 436         else
 437                 cfglo &= ~IDMA64C_CFGL_CH_DRAIN;
 438
 439         channel_writel(idma64c, CFG_LO, cfglo | IDMA64C_CFGL_CH_SUSP);
 440         do {
 441                 udelay(1);
 442                 cfglo = channel_readl(idma64c, CFG_LO);
 443         } while (!(cfglo & IDMA64C_CFGL_FIFO_EMPTY) && --count);
 444 }
 445
 446 static void idma64_chan_activate(struct idma64_chan *idma64c)
 447 {
 448         u32 cfglo;
 449
 450         cfglo = channel_readl(idma64c, CFG_LO);
 451         channel_writel(idma64c, CFG_LO, cfglo & ~IDMA64C_CFGL_CH_SUSP);
 452 }
 453
 454 static int idma64_pause(struct dma_chan *chan)
 455 {
 456         struct idma64_chan *idma64c = to_idma64_chan(chan);
 457         unsigned long flags;
 458
 459         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 460         if (idma64c->desc && idma64c->desc->status == DMA_IN_PROGRESS) {
 461                 idma64_chan_deactivate(idma64c, false);
 462                 idma64c->desc->status = DMA_PAUSED;
 463         }
 464         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 465
 466         return 0;
 467 }
 468
 469 static int idma64_resume(struct dma_chan *chan)
 470 {
 471         struct idma64_chan *idma64c = to_idma64_chan(chan);
 472         unsigned long flags;
 473
 474         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 475         if (idma64c->desc && idma64c->desc->status == DMA_PAUSED) {
 476                 idma64c->desc->status = DMA_IN_PROGRESS;
 477                 idma64_chan_activate(idma64c);
 478         }
 479         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 480
 481         return 0;
 482 }
 483
 484 static int idma64_terminate_all(struct dma_chan *chan)
 485 {
 486         struct idma64_chan *idma64c = to_idma64_chan(chan);
 487         unsigned long flags;
 488         LIST_HEAD(head);
 489
 490         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 491         idma64_chan_deactivate(idma64c, true);
 492         idma64_stop_transfer(idma64c);
 493         if (idma64c->desc) {
 494                 idma64_vdesc_free(&idma64c->desc->vdesc);
 495                 idma64c->desc = NULL;
 496         }
 497         vchan_get_all_descriptors(&idma64c->vchan, &head);
 498         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 499
 500         vchan_dma_desc_free_list(&idma64c->vchan, &head);
 501         return 0;
 502 }
 503
 504 static int idma64_alloc_chan_resources(struct dma_chan *chan)
 505 {
 506         struct idma64_chan *idma64c = to_idma64_chan(chan);
 507
 508         /* Create a pool of consistent memory blocks for hardware descriptors */
 509         idma64c->pool = dma_pool_create(dev_name(chan2dev(chan)),
 510                                         chan->device->dev,
 511                                         sizeof(struct idma64_lli), 8, 0);
 512         if (!idma64c->pool) {
 513                 dev_err(chan2dev(chan), "No memory for descriptors\n");
 514                 return -ENOMEM;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static void idma64_free_chan_resources(struct dma_chan *chan)
 521 {
 522         struct idma64_chan *idma64c = to_idma64_chan(chan);
 523
 524         vchan_free_chan_resources(to_virt_chan(chan));
 525         dma_pool_destroy(idma64c->pool);
 526         idma64c->pool = NULL;
 527 }
 528
 529 /* ---------------------------------------------------------------------- */
 530
 531 #define IDMA64_BUSWIDTHS                                \
 532         BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)          |       \
 533         BIT(DMA_SLAVE_BUSWIDTH_2_BYTES)         |       \
 534         BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
 535
 536 static int idma64_probe(struct idma64_chip *chip)
 537 {
 538         struct idma64 *idma64;
 539         unsigned short nr_chan = IDMA64_NR_CHAN;
 540         unsigned short i;
 541         int ret;
 542
 543         idma64 = devm_kzalloc(chip->dev, sizeof(*idma64), GFP_KERNEL);
 544         if (!idma64)
 545                 return -ENOMEM;
 546
 547         idma64->regs = chip->regs;
 548         chip->idma64 = idma64;
 549
 550         idma64->chan = devm_kcalloc(chip->dev, nr_chan, sizeof(*idma64->chan),
 551                                     GFP_KERNEL);
 552         if (!idma64->chan)
 553                 return -ENOMEM;
 554
 555         idma64->all_chan_mask = (1 << nr_chan) - 1;
 556
 557         /* Turn off iDMA controller */
 558         idma64_off(idma64);
 559
 560         ret = devm_request_irq(chip->dev, chip->irq, idma64_irq, IRQF_SHARED,
 561                                dev_name(chip->dev), idma64);
 562         if (ret)
 563                 return ret;
 564
 565         INIT_LIST_HEAD(&idma64->dma.channels);
 566         for (i = 0; i < nr_chan; i++) {
 567                 struct idma64_chan *idma64c = &idma64->chan[i];
 568
 569                 idma64c->vchan.desc_free = idma64_vdesc_free;
 570                 vchan_init(&idma64c->vchan, &idma64->dma);
 571
 572                 idma64c->regs = idma64->regs + i * IDMA64_CH_LENGTH;
 573                 idma64c->mask = BIT(i);
 574         }
 575
 576         dma_cap_set(DMA_SLAVE, idma64->dma.cap_mask);
 577         dma_cap_set(DMA_PRIVATE, idma64->dma.cap_mask);
 578
 579         idma64->dma.device_alloc_chan_resources = idma64_alloc_chan_resources;
 580         idma64->dma.device_free_chan_resources = idma64_free_chan_resources;
 581
 582         idma64->dma.device_prep_slave_sg = idma64_prep_slave_sg;
 583
 584         idma64->dma.device_issue_pending = idma64_issue_pending;
 585         idma64->dma.device_tx_status = idma64_tx_status;
 586
 587         idma64->dma.device_config = idma64_slave_config;
 588         idma64->dma.device_pause = idma64_pause;
 589         idma64->dma.device_resume = idma64_resume;
 590         idma64->dma.device_terminate_all = idma64_terminate_all;
 591
 592         idma64->dma.src_addr_widths = IDMA64_BUSWIDTHS;
 593         idma64->dma.dst_addr_widths = IDMA64_BUSWIDTHS;
 594         idma64->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 595         idma64->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 596
 597         idma64->dma.dev = chip->dev;
 598
 599         ret = dma_async_device_register(&idma64->dma);
 600         if (ret)
 601                 return ret;
 602
 603         dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
 604         return 0;
 605 }
 606
 607 static int idma64_remove(struct idma64_chip *chip)
 608 {
 609         struct idma64 *idma64 = chip->idma64;
 610         unsigned short i;
 611
 612         dma_async_device_unregister(&idma64->dma);
 613
 614         /*
 615          * Explicitly call devm_request_irq() to avoid the side effects with
 616          * the scheduled tasklets.
 617          */
 618         devm_free_irq(chip->dev, chip->irq, idma64);
 619
 620         for (i = 0; i < idma64->dma.chancnt; i++) {
 621                 struct idma64_chan *idma64c = &idma64->chan[i];
 622
 623                 tasklet_kill(&idma64c->vchan.task);
 624         }
 625
 626         return 0;
 627 }
 628
 629 /* ---------------------------------------------------------------------- */
 630
 631 static int idma64_platform_probe(struct platform_device *pdev)
 632 {
 633         struct idma64_chip *chip;
 634         struct device *dev = &pdev->dev;
 635         struct resource *mem;
 636         int ret;
 637
 638         chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 639         if (!chip)
 640                 return -ENOMEM;
 641
 642         chip->irq = platform_get_irq(pdev, 0);
 643         if (chip->irq < 0)
 644                 return chip->irq;
 645
 646         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 647         chip->regs = devm_ioremap_resource(dev, mem);
 648         if (IS_ERR(chip->regs))
 649                 return PTR_ERR(chip->regs);
 650
 651         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 652         if (ret)
 653                 return ret;
 654
 655         chip->dev = dev;
 656
 657         ret = idma64_probe(chip);
 658         if (ret)
 659                 return ret;
 660
 661         platform_set_drvdata(pdev, chip);
 662         return 0;
 663 }
 664
 665 static int idma64_platform_remove(struct platform_device *pdev)
 666 {
 667         struct idma64_chip *chip = platform_get_drvdata(pdev);
 668
 669         return idma64_remove(chip);
 670 }
 671
 672 #ifdef CONFIG_PM_SLEEP
 673
 674 static int idma64_pm_suspend(struct device *dev)
 675 {
 676         struct platform_device *pdev = to_platform_device(dev);
 677         struct idma64_chip *chip = platform_get_drvdata(pdev);
 678
 679         idma64_off(chip->idma64);
 680         return 0;
 681 }
 682
 683 static int idma64_pm_resume(struct device *dev)
 684 {
 685         struct platform_device *pdev = to_platform_device(dev);
 686         struct idma64_chip *chip = platform_get_drvdata(pdev);
 687
 688         idma64_on(chip->idma64);
 689         return 0;
 690 }
 691
 692 #endif /* CONFIG_PM_SLEEP */
 693
 694 static const struct dev_pm_ops idma64_dev_pm_ops = {
 695         SET_SYSTEM_SLEEP_PM_OPS(idma64_pm_suspend, idma64_pm_resume)
 696 };
 697
 698 static struct platform_driver idma64_platform_driver = {
 699         .probe          = idma64_platform_probe,
 700         .remove         = idma64_platform_remove,
 701         .driver = {
 702                 .name   = DRV_NAME,
 703                 .pm     = &idma64_dev_pm_ops,
 704         },
 705 };
 706
 707 module_platform_driver(idma64_platform_driver);
 708
 709 MODULE_LICENSE("GPL v2");
 710 MODULE_DESCRIPTION("iDMA64 core driver");
 711 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 712 MODULE_ALIAS("platform:" DRV_NAME);