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         status_xfer = dma_readl(idma64, RAW(XFER));
 182         status_err = dma_readl(idma64, RAW(ERROR));
 183
 184         for (i = 0; i < idma64->dma.chancnt; i++)
 185                 idma64_chan_irq(idma64, i, status_err, status_xfer);
 186
 187         return IRQ_HANDLED;
 188 }
 189
 190 /* ---------------------------------------------------------------------- */
 191
 192 static struct idma64_desc *idma64_alloc_desc(unsigned int ndesc)
 193 {
 194         struct idma64_desc *desc;
 195
 196         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 197         if (!desc)
 198                 return NULL;
 199
 200         desc->hw = kcalloc(ndesc, sizeof(*desc->hw), GFP_NOWAIT);
 201         if (!desc->hw) {
 202                 kfree(desc);
 203                 return NULL;
 204         }
 205
 206         return desc;
 207 }
 208
 209 static void idma64_desc_free(struct idma64_chan *idma64c,
 210                 struct idma64_desc *desc)
 211 {
 212         struct idma64_hw_desc *hw;
 213
 214         if (desc->ndesc) {
 215                 unsigned int i = desc->ndesc;
 216
 217                 do {
 218                         hw = &desc->hw[--i];
 219                         dma_pool_free(idma64c->pool, hw->lli, hw->llp);
 220                 } while (i);
 221         }
 222
 223         kfree(desc->hw);
 224         kfree(desc);
 225 }
 226
 227 static void idma64_vdesc_free(struct virt_dma_desc *vdesc)
 228 {
 229         struct idma64_chan *idma64c = to_idma64_chan(vdesc->tx.chan);
 230
 231         idma64_desc_free(idma64c, to_idma64_desc(vdesc));
 232 }
 233
 234 static void idma64_hw_desc_fill(struct idma64_hw_desc *hw,
 235                 struct dma_slave_config *config,
 236                 enum dma_transfer_direction direction, u64 llp)
 237 {
 238         struct idma64_lli *lli = hw->lli;
 239         u64 sar, dar;
 240         u32 ctlhi = IDMA64C_CTLH_BLOCK_TS(hw->len);
 241         u32 ctllo = IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN;
 242         u32 src_width, dst_width;
 243
 244         if (direction == DMA_MEM_TO_DEV) {
 245                 sar = hw->phys;
 246                 dar = config->dst_addr;
 247                 ctllo |= IDMA64C_CTLL_DST_FIX | IDMA64C_CTLL_SRC_INC |
 248                          IDMA64C_CTLL_FC_M2P;
 249                 src_width = __ffs(sar | hw->len | 4);
 250                 dst_width = __ffs(config->dst_addr_width);
 251         } else {        /* DMA_DEV_TO_MEM */
 252                 sar = config->src_addr;
 253                 dar = hw->phys;
 254                 ctllo |= IDMA64C_CTLL_DST_INC | IDMA64C_CTLL_SRC_FIX |
 255                          IDMA64C_CTLL_FC_P2M;
 256                 src_width = __ffs(config->src_addr_width);
 257                 dst_width = __ffs(dar | hw->len | 4);
 258         }
 259
 260         lli->sar = sar;
 261         lli->dar = dar;
 262
 263         lli->ctlhi = ctlhi;
 264         lli->ctllo = ctllo |
 265                      IDMA64C_CTLL_SRC_MSIZE(config->src_maxburst) |
 266                      IDMA64C_CTLL_DST_MSIZE(config->dst_maxburst) |
 267                      IDMA64C_CTLL_DST_WIDTH(dst_width) |
 268                      IDMA64C_CTLL_SRC_WIDTH(src_width);
 269
 270         lli->llp = llp;
 271 }
 272
 273 static void idma64_desc_fill(struct idma64_chan *idma64c,
 274                 struct idma64_desc *desc)
 275 {
 276         struct dma_slave_config *config = &idma64c->config;
 277         unsigned int i = desc->ndesc;
 278         struct idma64_hw_desc *hw = &desc->hw[i - 1];
 279         struct idma64_lli *lli = hw->lli;
 280         u64 llp = 0;
 281
 282         /* Fill the hardware descriptors and link them to a list */
 283         do {
 284                 hw = &desc->hw[--i];
 285                 idma64_hw_desc_fill(hw, config, desc->direction, llp);
 286                 llp = hw->llp;
 287                 desc->length += hw->len;
 288         } while (i);
 289
 290         /* Trigger an interrupt after the last block is transfered */
 291         lli->ctllo |= IDMA64C_CTLL_INT_EN;
 292
 293         /* Disable LLP transfer in the last block */
 294         lli->ctllo &= ~(IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
 295 }
 296
 297 static struct dma_async_tx_descriptor *idma64_prep_slave_sg(
 298                 struct dma_chan *chan, struct scatterlist *sgl,
 299                 unsigned int sg_len, enum dma_transfer_direction direction,
 300                 unsigned long flags, void *context)
 301 {
 302         struct idma64_chan *idma64c = to_idma64_chan(chan);
 303         struct idma64_desc *desc;
 304         struct scatterlist *sg;
 305         unsigned int i;
 306
 307         desc = idma64_alloc_desc(sg_len);
 308         if (!desc)
 309                 return NULL;
 310
 311         for_each_sg(sgl, sg, sg_len, i) {
 312                 struct idma64_hw_desc *hw = &desc->hw[i];
 313
 314                 /* Allocate DMA capable memory for hardware descriptor */
 315                 hw->lli = dma_pool_alloc(idma64c->pool, GFP_NOWAIT, &hw->llp);
 316                 if (!hw->lli) {
 317                         desc->ndesc = i;
 318                         idma64_desc_free(idma64c, desc);
 319                         return NULL;
 320                 }
 321
 322                 hw->phys = sg_dma_address(sg);
 323                 hw->len = sg_dma_len(sg);
 324         }
 325
 326         desc->ndesc = sg_len;
 327         desc->direction = direction;
 328         desc->status = DMA_IN_PROGRESS;
 329
 330         idma64_desc_fill(idma64c, desc);
 331         return vchan_tx_prep(&idma64c->vchan, &desc->vdesc, flags);
 332 }
 333
 334 static void idma64_issue_pending(struct dma_chan *chan)
 335 {
 336         struct idma64_chan *idma64c = to_idma64_chan(chan);
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 340         if (vchan_issue_pending(&idma64c->vchan) && !idma64c->desc)
 341                 idma64_start_transfer(idma64c);
 342         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 343 }
 344
 345 static size_t idma64_active_desc_size(struct idma64_chan *idma64c)
 346 {
 347         struct idma64_desc *desc = idma64c->desc;
 348         struct idma64_hw_desc *hw;
 349         size_t bytes = desc->length;
 350         u64 llp = channel_readq(idma64c, LLP);
 351         u32 ctlhi = channel_readl(idma64c, CTL_HI);
 352         unsigned int i = 0;
 353
 354         do {
 355                 hw = &desc->hw[i];
 356                 if (hw->llp == llp)
 357                         break;
 358                 bytes -= hw->len;
 359         } while (++i < desc->ndesc);
 360
 361         if (!i)
 362                 return bytes;
 363
 364         /* The current chunk is not fully transfered yet */
 365         bytes += desc->hw[--i].len;
 366
 367         return bytes - IDMA64C_CTLH_BLOCK_TS(ctlhi);
 368 }
 369
 370 static enum dma_status idma64_tx_status(struct dma_chan *chan,
 371                 dma_cookie_t cookie, struct dma_tx_state *state)
 372 {
 373         struct idma64_chan *idma64c = to_idma64_chan(chan);
 374         struct virt_dma_desc *vdesc;
 375         enum dma_status status;
 376         size_t bytes;
 377         unsigned long flags;
 378
 379         status = dma_cookie_status(chan, cookie, state);
 380         if (status == DMA_COMPLETE)
 381                 return status;
 382
 383         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 384         vdesc = vchan_find_desc(&idma64c->vchan, cookie);
 385         if (idma64c->desc && cookie == idma64c->desc->vdesc.tx.cookie) {
 386                 bytes = idma64_active_desc_size(idma64c);
 387                 dma_set_residue(state, bytes);
 388                 status = idma64c->desc->status;
 389         } else if (vdesc) {
 390                 bytes = to_idma64_desc(vdesc)->length;
 391                 dma_set_residue(state, bytes);
 392         }
 393         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 394
 395         return status;
 396 }
 397
 398 static void convert_burst(u32 *maxburst)
 399 {
 400         if (*maxburst)
 401                 *maxburst = __fls(*maxburst);
 402         else
 403                 *maxburst = 0;
 404 }
 405
 406 static int idma64_slave_config(struct dma_chan *chan,
 407                 struct dma_slave_config *config)
 408 {
 409         struct idma64_chan *idma64c = to_idma64_chan(chan);
 410
 411         /* Check if chan will be configured for slave transfers */
 412         if (!is_slave_direction(config->direction))
 413                 return -EINVAL;
 414
 415         memcpy(&idma64c->config, config, sizeof(idma64c->config));
 416
 417         convert_burst(&idma64c->config.src_maxburst);
 418         convert_burst(&idma64c->config.dst_maxburst);
 419
 420         return 0;
 421 }
 422
 423 static void idma64_chan_deactivate(struct idma64_chan *idma64c, bool drain)
 424 {
 425         unsigned short count = 100;
 426         u32 cfglo;
 427
 428         cfglo = channel_readl(idma64c, CFG_LO);
 429         if (drain)
 430                 cfglo |= IDMA64C_CFGL_CH_DRAIN;
 431         else
 432                 cfglo &= ~IDMA64C_CFGL_CH_DRAIN;
 433
 434         channel_writel(idma64c, CFG_LO, cfglo | IDMA64C_CFGL_CH_SUSP);
 435         do {
 436                 udelay(1);
 437                 cfglo = channel_readl(idma64c, CFG_LO);
 438         } while (!(cfglo & IDMA64C_CFGL_FIFO_EMPTY) && --count);
 439 }
 440
 441 static void idma64_chan_activate(struct idma64_chan *idma64c)
 442 {
 443         u32 cfglo;
 444
 445         cfglo = channel_readl(idma64c, CFG_LO);
 446         channel_writel(idma64c, CFG_LO, cfglo & ~IDMA64C_CFGL_CH_SUSP);
 447 }
 448
 449 static int idma64_pause(struct dma_chan *chan)
 450 {
 451         struct idma64_chan *idma64c = to_idma64_chan(chan);
 452         unsigned long flags;
 453
 454         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 455         if (idma64c->desc && idma64c->desc->status == DMA_IN_PROGRESS) {
 456                 idma64_chan_deactivate(idma64c, false);
 457                 idma64c->desc->status = DMA_PAUSED;
 458         }
 459         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 460
 461         return 0;
 462 }
 463
 464 static int idma64_resume(struct dma_chan *chan)
 465 {
 466         struct idma64_chan *idma64c = to_idma64_chan(chan);
 467         unsigned long flags;
 468
 469         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 470         if (idma64c->desc && idma64c->desc->status == DMA_PAUSED) {
 471                 idma64c->desc->status = DMA_IN_PROGRESS;
 472                 idma64_chan_activate(idma64c);
 473         }
 474         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 475
 476         return 0;
 477 }
 478
 479 static int idma64_terminate_all(struct dma_chan *chan)
 480 {
 481         struct idma64_chan *idma64c = to_idma64_chan(chan);
 482         unsigned long flags;
 483         LIST_HEAD(head);
 484
 485         spin_lock_irqsave(&idma64c->vchan.lock, flags);
 486         idma64_chan_deactivate(idma64c, true);
 487         idma64_stop_transfer(idma64c);
 488         if (idma64c->desc) {
 489                 idma64_vdesc_free(&idma64c->desc->vdesc);
 490                 idma64c->desc = NULL;
 491         }
 492         vchan_get_all_descriptors(&idma64c->vchan, &head);
 493         spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
 494
 495         vchan_dma_desc_free_list(&idma64c->vchan, &head);
 496         return 0;
 497 }
 498
 499 static int idma64_alloc_chan_resources(struct dma_chan *chan)
 500 {
 501         struct idma64_chan *idma64c = to_idma64_chan(chan);
 502
 503         /* Create a pool of consistent memory blocks for hardware descriptors */
 504         idma64c->pool = dma_pool_create(dev_name(chan2dev(chan)),
 505                                         chan->device->dev,
 506                                         sizeof(struct idma64_lli), 8, 0);
 507         if (!idma64c->pool) {
 508                 dev_err(chan2dev(chan), "No memory for descriptors\n");
 509                 return -ENOMEM;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static void idma64_free_chan_resources(struct dma_chan *chan)
 516 {
 517         struct idma64_chan *idma64c = to_idma64_chan(chan);
 518
 519         vchan_free_chan_resources(to_virt_chan(chan));
 520         dma_pool_destroy(idma64c->pool);
 521         idma64c->pool = NULL;
 522 }
 523
 524 /* ---------------------------------------------------------------------- */
 525
 526 #define IDMA64_BUSWIDTHS                                \
 527         BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)          |       \
 528         BIT(DMA_SLAVE_BUSWIDTH_2_BYTES)         |       \
 529         BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)
 530
 531 static int idma64_probe(struct idma64_chip *chip)
 532 {
 533         struct idma64 *idma64;
 534         unsigned short nr_chan = IDMA64_NR_CHAN;
 535         unsigned short i;
 536         int ret;
 537
 538         idma64 = devm_kzalloc(chip->dev, sizeof(*idma64), GFP_KERNEL);
 539         if (!idma64)
 540                 return -ENOMEM;
 541
 542         idma64->regs = chip->regs;
 543         chip->idma64 = idma64;
 544
 545         idma64->chan = devm_kcalloc(chip->dev, nr_chan, sizeof(*idma64->chan),
 546                                     GFP_KERNEL);
 547         if (!idma64->chan)
 548                 return -ENOMEM;
 549
 550         idma64->all_chan_mask = (1 << nr_chan) - 1;
 551
 552         /* Turn off iDMA controller */
 553         idma64_off(idma64);
 554
 555         ret = devm_request_irq(chip->dev, chip->irq, idma64_irq, IRQF_SHARED,
 556                                dev_name(chip->dev), idma64);
 557         if (ret)
 558                 return ret;
 559
 560         INIT_LIST_HEAD(&idma64->dma.channels);
 561         for (i = 0; i < nr_chan; i++) {
 562                 struct idma64_chan *idma64c = &idma64->chan[i];
 563
 564                 idma64c->vchan.desc_free = idma64_vdesc_free;
 565                 vchan_init(&idma64c->vchan, &idma64->dma);
 566
 567                 idma64c->regs = idma64->regs + i * IDMA64_CH_LENGTH;
 568                 idma64c->mask = BIT(i);
 569         }
 570
 571         dma_cap_set(DMA_SLAVE, idma64->dma.cap_mask);
 572         dma_cap_set(DMA_PRIVATE, idma64->dma.cap_mask);
 573
 574         idma64->dma.device_alloc_chan_resources = idma64_alloc_chan_resources;
 575         idma64->dma.device_free_chan_resources = idma64_free_chan_resources;
 576
 577         idma64->dma.device_prep_slave_sg = idma64_prep_slave_sg;
 578
 579         idma64->dma.device_issue_pending = idma64_issue_pending;
 580         idma64->dma.device_tx_status = idma64_tx_status;
 581
 582         idma64->dma.device_config = idma64_slave_config;
 583         idma64->dma.device_pause = idma64_pause;
 584         idma64->dma.device_resume = idma64_resume;
 585         idma64->dma.device_terminate_all = idma64_terminate_all;
 586
 587         idma64->dma.src_addr_widths = IDMA64_BUSWIDTHS;
 588         idma64->dma.dst_addr_widths = IDMA64_BUSWIDTHS;
 589         idma64->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 590         idma64->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 591
 592         idma64->dma.dev = chip->dev;
 593
 594         dma_set_max_seg_size(idma64->dma.dev, IDMA64C_CTLH_BLOCK_TS_MASK);
 595
 596         ret = dma_async_device_register(&idma64->dma);
 597         if (ret)
 598                 return ret;
 599
 600         dev_info(chip->dev, "Found Intel integrated DMA 64-bit\n");
 601         return 0;
 602 }
 603
 604 static int idma64_remove(struct idma64_chip *chip)
 605 {
 606         struct idma64 *idma64 = chip->idma64;
 607         unsigned short i;
 608
 609         dma_async_device_unregister(&idma64->dma);
 610
 611         /*
 612          * Explicitly call devm_request_irq() to avoid the side effects with
 613          * the scheduled tasklets.
 614          */
 615         devm_free_irq(chip->dev, chip->irq, idma64);
 616
 617         for (i = 0; i < idma64->dma.chancnt; i++) {
 618                 struct idma64_chan *idma64c = &idma64->chan[i];
 619
 620                 tasklet_kill(&idma64c->vchan.task);
 621         }
 622
 623         return 0;
 624 }
 625
 626 /* ---------------------------------------------------------------------- */
 627
 628 static int idma64_platform_probe(struct platform_device *pdev)
 629 {
 630         struct idma64_chip *chip;
 631         struct device *dev = &pdev->dev;
 632         struct resource *mem;
 633         int ret;
 634
 635         chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 636         if (!chip)
 637                 return -ENOMEM;
 638
 639         chip->irq = platform_get_irq(pdev, 0);
 640         if (chip->irq < 0)
 641                 return chip->irq;
 642
 643         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 644         chip->regs = devm_ioremap_resource(dev, mem);
 645         if (IS_ERR(chip->regs))
 646                 return PTR_ERR(chip->regs);
 647
 648         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 649         if (ret)
 650                 return ret;
 651
 652         chip->dev = dev;
 653
 654         ret = idma64_probe(chip);
 655         if (ret)
 656                 return ret;
 657
 658         platform_set_drvdata(pdev, chip);
 659         return 0;
 660 }
 661
 662 static int idma64_platform_remove(struct platform_device *pdev)
 663 {
 664         struct idma64_chip *chip = platform_get_drvdata(pdev);
 665
 666         return idma64_remove(chip);
 667 }
 668
 669 #ifdef CONFIG_PM_SLEEP
 670
 671 static int idma64_pm_suspend(struct device *dev)
 672 {
 673         struct platform_device *pdev = to_platform_device(dev);
 674         struct idma64_chip *chip = platform_get_drvdata(pdev);
 675
 676         idma64_off(chip->idma64);
 677         return 0;
 678 }
 679
 680 static int idma64_pm_resume(struct device *dev)
 681 {
 682         struct platform_device *pdev = to_platform_device(dev);
 683         struct idma64_chip *chip = platform_get_drvdata(pdev);
 684
 685         idma64_on(chip->idma64);
 686         return 0;
 687 }
 688
 689 #endif /* CONFIG_PM_SLEEP */
 690
 691 static const struct dev_pm_ops idma64_dev_pm_ops = {
 692         SET_SYSTEM_SLEEP_PM_OPS(idma64_pm_suspend, idma64_pm_resume)
 693 };
 694
 695 static struct platform_driver idma64_platform_driver = {
 696         .probe          = idma64_platform_probe,
 697         .remove         = idma64_platform_remove,
 698         .driver = {
 699                 .name   = DRV_NAME,
 700                 .pm     = &idma64_dev_pm_ops,
 701         },
 702 };
 703
 704 module_platform_driver(idma64_platform_driver);
 705
 706 MODULE_LICENSE("GPL v2");
 707 MODULE_DESCRIPTION("iDMA64 core driver");
 708 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 709 MODULE_ALIAS("platform:" DRV_NAME);