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 <[email protected]>
   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 <linux/dma/idma64.h>
  23
  24 #include "idma64.h"
  25
  26 /* For now we support only two channels */
  27 #define IDMA64_NR_CHAN          2
  28
  29 /* ---------------------------------------------------------------------- */
  30
  31 static struct device *chan2dev(struct dma_chan *chan)
  32 {
  33         return &chan->dev->device;
  34 }
  35
  36 /* ---------------------------------------------------------------------- */
  37
  38 static void idma64_off(struct idma64 *idma64)
  39 {
  40         unsigned short count = 100;
  41
  42         dma_writel(idma64, CFG, 0);
  43
  44         channel_clear_bit(idma64, MASK(XFER), idma64->all_chan_mask);
  45         channel_clear_bit(idma64, MASK(BLOCK), idma64->all_chan_mask);
  46         channel_clear_bit(idma64, MASK(SRC_TRAN), idma64->all_chan_mask);
  47         channel_clear_bit(idma64, MASK(DST_TRAN), idma64->all_chan_mask);
  48         channel_clear_bit(idma64, MASK(ERROR), idma64->all_chan_mask);
  49
  50         do {
  51                 cpu_relax();
  52         } while (dma_readl(idma64, CFG) & IDMA64_CFG_DMA_EN && --count);
  53 }
  54
  55 static void idma64_on(struct idma64 *idma64)
  56 {
  57         dma_writel(idma64, CFG, IDMA64_CFG_DMA_EN);
  58 }
  59
  60 /* ---------------------------------------------------------------------- */
  61
  62 static void idma64_chan_init(struct idma64 *idma64, struct idma64_chan *idma64c)
  63 {
  64         u32 cfghi = IDMA64C_CFGH_SRC_PER(1) | IDMA64C_CFGH_DST_PER(0);
  65         u32 cfglo = 0;
  66
  67         /* Set default burst alignment */
  68         cfglo |= IDMA64C_CFGL_DST_BURST_ALIGN | IDMA64C_CFGL_SRC_BURST_ALIGN;
  69
  70         channel_writel(idma64c, CFG_LO, cfglo);
  71         channel_writel(idma64c, CFG_HI, cfghi);
  72
  73         /* Enable interrupts */
  74         channel_set_bit(idma64, MASK(XFER), idma64c->mask);
  75         channel_set_bit(idma64, MASK(ERROR), idma64c->mask);
  76
  77         /*
  78          * Enforce the controller to be turned on.
  79          *
  80          * The iDMA is turned off in ->probe() and looses context during system
  81          * suspend / resume cycle. That's why we have to enable it each time we
  82          * use it.
  83          */
  84         idma64_on(idma64);
  85 }
  86
  87 static void idma64_chan_stop(struct idma64 *idma64, struct idma64_chan *idma64c)
  88 {
  89         channel_clear_bit(idma64, CH_EN, idma64c->mask);
  90 }
  91
  92 static void idma64_chan_start(struct idma64 *idma64, struct idma64_chan *idma64c)
  93 {
  94         struct idma64_desc *desc = idma64c->desc;
  95         struct idma64_hw_desc *hw = &desc->hw[0];
  96
  97         channel_writeq(idma64c, SAR, 0);
  98         channel_writeq(idma64c, DAR, 0);
  99
 100         channel_writel(idma64c, CTL_HI, IDMA64C_CTLH_BLOCK_TS(~0UL));
 101         channel_writel(idma64c, CTL_LO, IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
 102
 103         channel_writeq(idma64c, LLP, hw->llp);
 104
 105         channel_set_bit(idma64, CH_EN, idma64c->mask);
 106 }
 107
 108 static void idma64_stop_transfer(struct idma64_chan *idma64c)
 109 {
 110         struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
 111
 112         idma64_chan_stop(idma64, idma64c);
 113 }
 114
 115 static void idma64_start_transfer(struct idma64_chan *idma64c)
 116 {
 117         struct idma64 *idma64 = to_idma64(idma64c->vchan.chan.device);
 118         struct virt_dma_desc *vdesc;
 119
 120         /* Get the next descriptor */
 121         vdesc = vchan_next_desc(&idma64c->vchan);
 122         if (!vdesc) {
 123                 idma64c->desc = NULL;
 124                 return;
 125         }
 126
 127         list_del(&vdesc->node);
 128         idma64c->desc = to_idma64_desc(vdesc);
 129
 130         /* Configure the channel */
 131         idma64_chan_init(idma64, idma64c);
 132
 133         /* Start the channel with a new descriptor */
 134         idma64_chan_start(idma64, idma64c);
 135 }
 136
 137 /* ---------------------------------------------------------------------- */
 138
 139 static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 140                 u32 status_err, u32 status_xfer)
 141 {
 142         struct idma64_chan *idma64c = &idma64->chan[c];
 143         struct idma64_desc *desc;
 144
 145         spin_lock(&idma64c->vchan.lock);
 146         desc = idma64c->desc;
 147         if (desc) {
 148                 if (status_err & (1 << c)) {
 149                         dma_writel(idma64, CLEAR(ERROR), idma64c->mask);
 150                         desc->status = DMA_ERROR;
 151                 } else if (status_xfer & (1 << c)) {
 152                         dma_writel(idma64, CLEAR(XFER), idma64c->mask);
 153                         desc->status = DMA_COMPLETE;
 154                         vchan_cookie_complete(&desc->vdesc);
 155                         idma64_start_transfer(idma64c);
 156                 }
 157
 158                 /* idma64_start_transfer() updates idma64c->desc */
 159                 if (idma64c->desc == NULL || desc->status == DMA_ERROR)
 160                         idma64_stop_transfer(idma64c);
 161         }
 162         spin_unlock(&idma64c->vchan.lock);
 163 }
 164
 165 static irqreturn_t idma64_irq(int irq, void *dev)
 166 {
 167         struct idma64 *idma64 = dev;
 168         u32 status = dma_readl(idma64, STATUS_INT);
 169         u32 status_xfer;
 170         u32 status_err;
 171         unsigned short i;
 172
 173         dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
 174
 175         /* Check if we have any interrupt from the DMA controller */
 176         if (!status)
 177                 return IRQ_NONE;
 178
 179         status_xfer = dma_readl(idma64, RAW(XFER));
 180         status_err = dma_readl(idma64, RAW(ERROR));
 181
 182         for (i = 0; i < idma64->dma.chancnt; i++)
 183                 idma64_chan_irq(idma64, i, status_err, status_xfer);
 184
 185         return IRQ_HANDLED;
 186 }
 187
 188 /* ---------------------------------------------------------------------- */
 189
 190 static struct idma64_desc *idma64_alloc_desc(unsigned int ndesc)
 191 {
 192         struct idma64_desc *desc;
 193
 194         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 195         if (!desc)
 196                 return NULL;
 197
 198         desc->hw = kcalloc(ndesc, sizeof(*desc->hw), GFP_NOWAIT);
 199         if (!desc->hw) {
 200                 kfree(desc);
 201                 return NULL;
 202         }
 203
 204         return desc;
 205 }
 206
 207 static void idma64_desc_free(struct idma64_chan *idma64c,
 208                 struct idma64_desc *desc)
 209 {
 210         struct idma64_hw_desc *hw;
 211
 212         if (desc->ndesc) {
 213                 unsigned int i = desc->ndesc;
 214
 215                 do {
 216                         hw = &desc->hw[--i];
 217                         dma_pool_free(idma64c->pool, hw->lli, hw->llp);
 218                 } while (i);
 219         }
 220
 221         kfree(desc->hw);
 222         kfree(desc);
 223 }
 224
 225 static void idma64_vdesc_free(struct virt_dma_desc *vdesc)
 226 {
 227         struct idma64_chan *idma64c = to_idma64_chan(vdesc->tx.chan);
 228
 229         idma64_desc_free(idma64c, to_idma64_desc(vdesc));
 230 }
 231
 232 static void idma64_hw_desc_fill(struct idma64_hw_desc *hw,
 233                 struct dma_slave_config *config,
 234                 enum dma_transfer_direction direction, u64 llp)
 235 {
 236         struct idma64_lli *lli = hw->lli;
 237         u64 sar, dar;
 238         u32 ctlhi = IDMA64C_CTLH_BLOCK_TS(hw->len);
 239         u32 ctllo = IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN;
 240         u32 src_width, dst_width;
 241
 242         if (direction == DMA_MEM_TO_DEV) {
 243                 sar = hw->phys;
 244                 dar = config->dst_addr;
 245                 ctllo |= IDMA64C_CTLL_DST_FIX | IDMA64C_CTLL_SRC_INC |
 246                          IDMA64C_CTLL_FC_M2P;
 247                 src_width = __ffs(sar | hw->len | 4);
 248                 dst_width = __ffs(config->dst_addr_width);
 249         } else {        /* DMA_DEV_TO_MEM */
 250                 sar = config->src_addr;
 251                 dar = hw->phys;
 252                 ctllo |= IDMA64C_CTLL_DST_INC | IDMA64C_CTLL_SRC_FIX |
 253                          IDMA64C_CTLL_FC_P2M;
 254                 src_width = __ffs(config->src_addr_width);
 255                 dst_width = __ffs(dar | hw->len | 4);
 256         }
 257
 258         lli->sar = sar;
 259         lli->dar = dar;
 260
 261         lli->ctlhi = ctlhi;
 262         lli->ctllo = ctllo |
 263                      IDMA64C_CTLL_SRC_MSIZE(config->src_maxburst) |
 264                      IDMA64C_CTLL_DST_MSIZE(config->dst_maxburst) |
 265                      IDMA64C_CTLL_DST_WIDTH(dst_width) |
 266                      IDMA64C_CTLL_SRC_WIDTH(src_width);
 267
 268         lli->llp = llp;
 269 }
 270
 271 static void idma64_desc_fill(struct idma64_chan *idma64c,
 272                 struct idma64_desc *desc)
 273 {
 274         struct dma_slave_config *config = &idma64c->config;
 275         unsigned int i = desc->ndesc;
 276         struct idma64_hw_desc *hw = &desc->hw[i - 1];
 277         struct idma64_lli *lli = hw->lli;
 278         u64 llp = 0;
 279
 280         /* Fill the hardware descriptors and link them to a list */
 281         do {
 282                 hw = &desc->hw[--i];
 283                 idma64_hw_desc_fill(hw, config, desc->direction, llp);
 284                 llp = hw->llp;
 285                 desc->length += hw->len;
 286         } while (i);
 287
 288         /* Trigger an interrupt after the last block is transfered */
 289         lli->ctllo |= IDMA64C_CTLL_INT_EN;
 290
 291         /* Disable LLP transfer in the last block */
 292         lli->ctllo &= ~(IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
 293 }
 294
 295 static struct dma_async_tx_descriptor *idma64_prep_slave_sg(
 296                 struct dma_chan *chan, struct scatterlist *sgl,
 297                 unsigned int sg_len, enum dma_transfer_direction direction,
 298                 unsigned long flags, void *context)
 299 {
 300         struct idma64_chan *idma64c = to_idma64_chan(chan);
 301         struct idma64_desc *desc;
 302         struct scatterlist *sg;
 303         unsigned int i;
 304
 305         desc = idma64_alloc_desc(sg_len);
 306         if (!desc)
 307                 return NULL;
 308
 309         for_each_sg(sgl, sg, sg_len, i) {
 310                 struct idma64_hw_desc *hw = &desc->hw[i];
 311
 312                 /* Allocate DMA capable memory for hardware descriptor */
 313                 hw->lli = dma_pool_alloc(idma64c->pool, GFP_NOWAIT, &hw->llp);
 314                 if (!hw->lli) {
 315                         desc->ndesc = i;
 316                         idma64_desc_free(idma64c, desc);
 317                         return NULL;
 318                 }
 319
 320                 hw->phys = sg_dma_address(sg);
 321                 hw->len = sg_dma_len(sg);
 322         }
 323
 324         desc->ndesc = sg_len;
 325         desc->direction = direction;
 326         desc->status = DMA_IN_PROGRESS;
 327
 328         idma64_desc_fill(idma64c, desc);
 329         return vchan_tx_prep(&idma64c->vchan, &desc->vdesc, flags);
 330 }
 331
 332 static void idma64_issue_pending(struct dma_chan *chan)
 333 {
 334         struct idma64_chan *idma64c = to_idma64_chan(chan);
 335         unsigned long flags;
 336
 337         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 338         if (vchan_issue_pending(&idma64c->vchan) && !idma64c->desc)
 339                 idma64_start_transfer(idma64c);
 340         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 341 }
 342
 343 static size_t idma64_active_desc_size(struct idma64_chan *idma64c)
 344 {
 345         struct idma64_desc *desc = idma64c->desc;
 346         struct idma64_hw_desc *hw;
 347         size_t bytes = desc->length;
 348         u64 llp = channel_readq(idma64c, LLP);
 349         u32 ctlhi = channel_readl(idma64c, CTL_HI);
 350         unsigned int i = 0;
 351
 352         do {
 353                 hw = &desc->hw[i];
 354                 if (hw->llp == llp)
 355                         break;
 356                 bytes -= hw->len;
 357         } while (++i < desc->ndesc);
 358
 359         if (!i)
 360                 return bytes;
 361
 362         /* The current chunk is not fully transfered yet */
 363         bytes += desc->hw[--i].len;
 364
 365         return bytes - IDMA64C_CTLH_BLOCK_TS(ctlhi);
 366 }
 367
 368 static enum dma_status idma64_tx_status(struct dma_chan *chan,
 369                 dma_cookie_t cookie, struct dma_tx_state *state)
 370 {
 371         struct idma64_chan *idma64c = to_idma64_chan(chan);
 372         struct virt_dma_desc *vdesc;
 373         enum dma_status status;
 374         size_t bytes;
 375         unsigned long flags;
 376
 377         status = dma_cookie_status(chan, cookie, state);
 378         if (status == DMA_COMPLETE)
 379                 return status;
 380
 381         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 382         vdesc = vchan_find_desc(&idma64c->vchan, cookie);
 383         if (idma64c->desc && cookie == idma64c->desc->vdesc.tx.cookie) {
 384                 bytes = idma64_active_desc_size(idma64c);
 385                 dma_set_residue(state, bytes);
 386                 status = idma64c->desc->status;
 387         } else if (vdesc) {
 388                 bytes = to_idma64_desc(vdesc)->length;
 389                 dma_set_residue(state, bytes);
 390         }
 391         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 392
 393         return status;
 394 }
 395
 396 static void convert_burst(u32 *maxburst)
 397 {
 398         if (*maxburst)
 399                 *maxburst = __fls(*maxburst);
 400         else
 401                 *maxburst = 0;
 402 }
 403
 404 static int idma64_slave_config(struct dma_chan *chan,
 405                 struct dma_slave_config *config)
 406 {
 407         struct idma64_chan *idma64c = to_idma64_chan(chan);
 408
 409         memcpy(&idma64c->config, config, sizeof(idma64c->config));
 410
 411         convert_burst(&idma64c->config.src_maxburst);
 412         convert_burst(&idma64c->config.dst_maxburst);
 413
 414         return 0;
 415 }
 416
 417 static void idma64_chan_deactivate(struct idma64_chan *idma64c, bool drain)
 418 {
 419         unsigned short count = 100;
 420         u32 cfglo;
 421
 422         cfglo = channel_readl(idma64c, CFG_LO);
 423         if (drain)
 424                 cfglo |= IDMA64C_CFGL_CH_DRAIN;
 425         else
 426                 cfglo &= ~IDMA64C_CFGL_CH_DRAIN;
 427
 428         channel_writel(idma64c, CFG_LO, cfglo | IDMA64C_CFGL_CH_SUSP);
 429         do {
 430                 udelay(1);
 431                 cfglo = channel_readl(idma64c, CFG_LO);
 432         } while (!(cfglo & IDMA64C_CFGL_FIFO_EMPTY) && --count);
 433 }
 434
 435 static void idma64_chan_activate(struct idma64_chan *idma64c)
 436 {
 437         u32 cfglo;
 438
 439         cfglo = channel_readl(idma64c, CFG_LO);
 440         channel_writel(idma64c, CFG_LO, cfglo & ~IDMA64C_CFGL_CH_SUSP);
 441 }
 442
 443 static int idma64_pause(struct dma_chan *chan)
 444 {
 445         struct idma64_chan *idma64c = to_idma64_chan(chan);
 446         unsigned long flags;
 447
 448         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 449         if (idma64c->desc && idma64c->desc->status == DMA_IN_PROGRESS) {
 450                 idma64_chan_deactivate(idma64c, false);
 451                 idma64c->desc->status = DMA_PAUSED;
 452         }
 453         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 454
 455         return 0;
 456 }
 457
 458 static int idma64_resume(struct dma_chan *chan)
 459 {
 460         struct idma64_chan *idma64c = to_idma64_chan(chan);
 461         unsigned long flags;
 462
 463         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 464         if (idma64c->desc && idma64c->desc->status == DMA_PAUSED) {
 465                 idma64c->desc->status = DMA_IN_PROGRESS;
 466                 idma64_chan_activate(idma64c);
 467         }
 468         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 469
 470         return 0;
 471 }
 472
 473 static int idma64_terminate_all(struct dma_chan *chan)
 474 {
 475         struct idma64_chan *idma64c = to_idma64_chan(chan);
 476         unsigned long flags;
 477         LIST_HEAD(head);
 478
 479         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 480         idma64_chan_deactivate(idma64c, true);
 481         idma64_stop_transfer(idma64c);
 482         if (idma64c->desc) {
 483                 idma64_vdesc_free(&idma64c->desc->vdesc);
 484                 idma64c->desc = NULL;
 485         }
 486         vchan_get_all_descriptors(&idma64c->vchan, &head);
 487         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 488
 489         vchan_dma_desc_free_list(&idma64c->vchan, &head);
 490         return 0;
 491 }
 492
 493 static void idma64_synchronize(struct dma_chan *chan)
 494 {
 495         struct idma64_chan *idma64c = to_idma64_chan(chan);
 496
 497         vchan_synchronize(&idma64c->vchan);
 498 }
 499
 500 static int idma64_alloc_chan_resources(struct dma_chan *chan)
 501 {
 502         struct idma64_chan *idma64c = to_idma64_chan(chan);
 503
 504         /* Create a pool of consistent memory blocks for hardware descriptors */
 505         idma64c->pool = dma_pool_create(dev_name(chan2dev(chan)),
 506                                         chan->device->dev,
 507                                         sizeof(struct idma64_lli), 8, 0);
 508         if (!idma64c->pool) {
 509                 dev_err(chan2dev(chan), "No memory for descriptors\n");
 510                 return -ENOMEM;
 511         }
 512
 513         return 0;
 514 }
 515
 516 static void idma64_free_chan_resources(struct dma_chan *chan)
 517 {
 518         struct idma64_chan *idma64c = to_idma64_chan(chan);
 519
 520         vchan_free_chan_resources(to_virt_chan(chan));
 521         dma_pool_destroy(idma64c->pool);
 522         idma64c->pool = NULL;
 523 }
 524
 525 /* ---------------------------------------------------------------------- */
 526
 527 #define IDMA64_BUSWIDTHS                                \
 528         BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)          |       \
 529         BIT(DMA_SLAVE_BUSWIDTH_2_BYTES)         |       \
 530         BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
 531
 532 static int idma64_probe(struct idma64_chip *chip)
 533 {
 534         struct idma64 *idma64;
 535         unsigned short nr_chan = IDMA64_NR_CHAN;
 536         unsigned short i;
 537         int ret;
 538
 539         idma64 = devm_kzalloc(chip->dev, sizeof(*idma64), GFP_KERNEL);
 540         if (!idma64)
 541                 return -ENOMEM;
 542
 543         idma64->regs = chip->regs;
 544         chip->idma64 = idma64;
 545
 546         idma64->chan = devm_kcalloc(chip->dev, nr_chan, sizeof(*idma64->chan),
 547                                     GFP_KERNEL);
 548         if (!idma64->chan)
 549                 return -ENOMEM;
 550
 551         idma64->all_chan_mask = (1 << nr_chan) - 1;
 552
 553         /* Turn off iDMA controller */
 554         idma64_off(idma64);
 555
 556         ret = devm_request_irq(chip->dev, chip->irq, idma64_irq, IRQF_SHARED,
 557                                dev_name(chip->dev), idma64);
 558         if (ret)
 559                 return ret;
 560
 561         INIT_LIST_HEAD(&idma64->dma.channels);
 562         for (i = 0; i < nr_chan; i++) {
 563                 struct idma64_chan *idma64c = &idma64->chan[i];
 564
 565                 idma64c->vchan.desc_free = idma64_vdesc_free;
 566                 vchan_init(&idma64c->vchan, &idma64->dma);
 567
 568                 idma64c->regs = idma64->regs + i * IDMA64_CH_LENGTH;
 569                 idma64c->mask = BIT(i);
 570         }
 571
 572         dma_cap_set(DMA_SLAVE, idma64->dma.cap_mask);
 573         dma_cap_set(DMA_PRIVATE, idma64->dma.cap_mask);
 574
 575         idma64->dma.device_alloc_chan_resources = idma64_alloc_chan_resources;
 576         idma64->dma.device_free_chan_resources = idma64_free_chan_resources;
 577
 578         idma64->dma.device_prep_slave_sg = idma64_prep_slave_sg;
 579
 580         idma64->dma.device_issue_pending = idma64_issue_pending;
 581         idma64->dma.device_tx_status = idma64_tx_status;
 582
 583         idma64->dma.device_config = idma64_slave_config;
 584         idma64->dma.device_pause = idma64_pause;
 585         idma64->dma.device_resume = idma64_resume;
 586         idma64->dma.device_terminate_all = idma64_terminate_all;
 587         idma64->dma.device_synchronize = idma64_synchronize;
 588
 589         idma64->dma.src_addr_widths = IDMA64_BUSWIDTHS;
 590         idma64->dma.dst_addr_widths = IDMA64_BUSWIDTHS;
 591         idma64->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 592         idma64->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 593
 594         idma64->dma.dev = chip->sysdev;
 595
 596         dma_set_max_seg_size(idma64->dma.dev, IDMA64C_CTLH_BLOCK_TS_MASK);
 597
 598         ret = dma_async_device_register(&idma64->dma);
 599         if (ret)
 600                 return ret;
 601
 602         dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
 603         return 0;
 604 }
 605
 606 static int idma64_remove(struct idma64_chip *chip)
 607 {
 608         struct idma64 *idma64 = chip->idma64;
 609         unsigned short i;
 610
 611         dma_async_device_unregister(&idma64->dma);
 612
 613         /*
 614          * Explicitly call devm_request_irq() to avoid the side effects with
 615          * the scheduled tasklets.
 616          */
 617         devm_free_irq(chip->dev, chip->irq, idma64);
 618
 619         for (i = 0; i < idma64->dma.chancnt; i++) {
 620                 struct idma64_chan *idma64c = &idma64->chan[i];
 621
 622                 tasklet_kill(&idma64c->vchan.task);
 623         }
 624
 625         return 0;
 626 }
 627
 628 /* ---------------------------------------------------------------------- */
 629
 630 static int idma64_platform_probe(struct platform_device *pdev)
 631 {
 632         struct idma64_chip *chip;
 633         struct device *dev = &pdev->dev;
 634         struct device *sysdev = dev->parent;
 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(sysdev, DMA_BIT_MASK(64));
 652         if (ret)
 653                 return ret;
 654
 655         chip->dev = dev;
 656         chip->sysdev = sysdev;
 657
 658         ret = idma64_probe(chip);
 659         if (ret)
 660                 return ret;
 661
 662         platform_set_drvdata(pdev, chip);
 663         return 0;
 664 }
 665
 666 static int idma64_platform_remove(struct platform_device *pdev)
 667 {
 668         struct idma64_chip *chip = platform_get_drvdata(pdev);
 669
 670         return idma64_remove(chip);
 671 }
 672
 673 #ifdef CONFIG_PM_SLEEP
 674
 675 static int idma64_pm_suspend(struct device *dev)
 676 {
 677         struct idma64_chip *chip = dev_get_drvdata(dev);
 678
 679         idma64_off(chip->idma64);
 680         return 0;
 681 }
 682
 683 static int idma64_pm_resume(struct device *dev)
 684 {
 685         struct idma64_chip *chip = dev_get_drvdata(dev);
 686
 687         idma64_on(chip->idma64);
 688         return 0;
 689 }
 690
 691 #endif /* CONFIG_PM_SLEEP */
 692
 693 static const struct dev_pm_ops idma64_dev_pm_ops = {
 694         SET_SYSTEM_SLEEP_PM_OPS(idma64_pm_suspend, idma64_pm_resume)
 695 };
 696
 697 static struct platform_driver idma64_platform_driver = {
 698         .probe          = idma64_platform_probe,
 699         .remove         = idma64_platform_remove,
 700         .driver = {
 701                 .name   = LPSS_IDMA64_DRIVER_NAME,
 702                 .pm     = &idma64_dev_pm_ops,
 703         },
 704 };
 705
 706 module_platform_driver(idma64_platform_driver);
 707
 708 MODULE_LICENSE("GPL v2");
 709 MODULE_DESCRIPTION("iDMA64 core driver");
 710 MODULE_AUTHOR("Andy Shevchenko <[email protected]>");
 711 MODULE_ALIAS("platform:" LPSS_IDMA64_DRIVER_NAME);