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