drivers/dma/fsl-edma-main.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/dma/fsl-edma.c
   4  *
   5  * Copyright 2013-2014 Freescale Semiconductor, Inc.
   6  *
   7  * Driver for the Freescale eDMA engine with flexible channel multiplexing
   8  * capability for DMA request sources. The eDMA block can be found on some
   9  * Vybrid and Layerscape SoCs.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/clk.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_dma.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/pm_domain.h>
  23
  24 #include "fsl-edma-common.h"
  25
  26 #define ARGS_RX                         BIT(0)
  27 #define ARGS_REMOTE                     BIT(1)
  28 #define ARGS_MULTI_FIFO                 BIT(2)
  29
  30 static void fsl_edma_synchronize(struct dma_chan *chan)
  31 {
  32         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
  33
  34         vchan_synchronize(&fsl_chan->vchan);
  35 }
  36
  37 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
  38 {
  39         struct fsl_edma_engine *fsl_edma = dev_id;
  40         unsigned int intr, ch;
  41         struct edma_regs *regs = &fsl_edma->regs;
  42
  43         intr = edma_readl(fsl_edma, regs->intl);
  44         if (!intr)
  45                 return IRQ_NONE;
  46
  47         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
  48                 if (intr & (0x1 << ch)) {
  49                         edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
  50                         fsl_edma_tx_chan_handler(&fsl_edma->chans[ch]);
  51                 }
  52         }
  53         return IRQ_HANDLED;
  54 }
  55
  56 static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id)
  57 {
  58         struct fsl_edma_chan *fsl_chan = dev_id;
  59         unsigned int intr;
  60
  61         intr = edma_readl_chreg(fsl_chan, ch_int);
  62         if (!intr)
  63                 return IRQ_HANDLED;
  64
  65         edma_writel_chreg(fsl_chan, 1, ch_int);
  66
  67         fsl_edma_tx_chan_handler(fsl_chan);
  68
  69         return IRQ_HANDLED;
  70 }
  71
  72 static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
  73 {
  74         struct fsl_edma_engine *fsl_edma = dev_id;
  75         unsigned int err, ch;
  76         struct edma_regs *regs = &fsl_edma->regs;
  77
  78         err = edma_readl(fsl_edma, regs->errl);
  79         if (!err)
  80                 return IRQ_NONE;
  81
  82         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
  83                 if (err & (0x1 << ch)) {
  84                         fsl_edma_disable_request(&fsl_edma->chans[ch]);
  85                         edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
  86                         fsl_edma_err_chan_handler(&fsl_edma->chans[ch]);
  87                 }
  88         }
  89         return IRQ_HANDLED;
  90 }
  91
  92 static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
  93 {
  94         if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
  95                 return IRQ_HANDLED;
  96
  97         return fsl_edma_err_handler(irq, dev_id);
  98 }
  99
 100 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 101                 struct of_dma *ofdma)
 102 {
 103         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 104         struct dma_chan *chan, *_chan;
 105         struct fsl_edma_chan *fsl_chan;
 106         u32 dmamux_nr = fsl_edma->drvdata->dmamuxs;
 107         unsigned long chans_per_mux = fsl_edma->n_chans / dmamux_nr;
 108
 109         if (dma_spec->args_count != 2)
 110                 return NULL;
 111
 112         mutex_lock(&fsl_edma->fsl_edma_mutex);
 113         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
 114                 if (chan->client_count)
 115                         continue;
 116                 if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
 117                         chan = dma_get_slave_channel(chan);
 118                         if (chan) {
 119                                 chan->device->privatecnt++;
 120                                 fsl_chan = to_fsl_edma_chan(chan);
 121                                 fsl_chan->slave_id = dma_spec->args[1];
 122                                 fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id,
 123                                                 true);
 124                                 mutex_unlock(&fsl_edma->fsl_edma_mutex);
 125                                 return chan;
 126                         }
 127                 }
 128         }
 129         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 130         return NULL;
 131 }
 132
 133 static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
 134                                         struct of_dma *ofdma)
 135 {
 136         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 137         struct dma_chan *chan, *_chan;
 138         struct fsl_edma_chan *fsl_chan;
 139         bool b_chmux;
 140         int i;
 141
 142         if (dma_spec->args_count != 3)
 143                 return NULL;
 144
 145         b_chmux = !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX);
 146
 147         mutex_lock(&fsl_edma->fsl_edma_mutex);
 148         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels,
 149                                         device_node) {
 150
 151                 if (chan->client_count)
 152                         continue;
 153
 154                 fsl_chan = to_fsl_edma_chan(chan);
 155                 i = fsl_chan - fsl_edma->chans;
 156
 157                 fsl_chan->priority = dma_spec->args[1];
 158                 fsl_chan->is_rxchan = dma_spec->args[2] & ARGS_RX;
 159                 fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE;
 160                 fsl_chan->is_multi_fifo = dma_spec->args[2] & ARGS_MULTI_FIFO;
 161
 162                 if (!b_chmux && i == dma_spec->args[0]) {
 163                         chan = dma_get_slave_channel(chan);
 164                         chan->device->privatecnt++;
 165                         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 166                         return chan;
 167                 } else if (b_chmux && !fsl_chan->srcid) {
 168                         /* if controller support channel mux, choose a free channel */
 169                         chan = dma_get_slave_channel(chan);
 170                         chan->device->privatecnt++;
 171                         fsl_chan->srcid = dma_spec->args[0];
 172                         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 173                         return chan;
 174                 }
 175         }
 176         mutex_unlock(&fsl_edma->fsl_edma_mutex);
 177         return NULL;
 178 }
 179
 180 static int
 181 fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 182 {
 183         int ret;
 184
 185         edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
 186
 187         fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
 188         if (fsl_edma->txirq < 0)
 189                 return fsl_edma->txirq;
 190
 191         fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
 192         if (fsl_edma->errirq < 0)
 193                 return fsl_edma->errirq;
 194
 195         if (fsl_edma->txirq == fsl_edma->errirq) {
 196                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 197                                 fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
 198                 if (ret) {
 199                         dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
 200                         return ret;
 201                 }
 202         } else {
 203                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 204                                 fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
 205                 if (ret) {
 206                         dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
 207                         return ret;
 208                 }
 209
 210                 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
 211                                 fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
 212                 if (ret) {
 213                         dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
 214                         return ret;
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int fsl_edma3_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 222 {
 223         int ret;
 224         int i;
 225
 226         for (i = 0; i < fsl_edma->n_chans; i++) {
 227
 228                 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 229
 230                 if (fsl_edma->chan_masked & BIT(i))
 231                         continue;
 232
 233                 /* request channel irq */
 234                 fsl_chan->txirq = platform_get_irq(pdev, i);
 235                 if (fsl_chan->txirq < 0) {
 236                         dev_err(&pdev->dev, "Can't get chan %d's irq.\n", i);
 237                         return  -EINVAL;
 238                 }
 239
 240                 ret = devm_request_irq(&pdev->dev, fsl_chan->txirq,
 241                         fsl_edma3_tx_handler, IRQF_SHARED,
 242                         fsl_chan->chan_name, fsl_chan);
 243                 if (ret) {
 244                         dev_err(&pdev->dev, "Can't register chan%d's IRQ.\n", i);
 245                         return -EINVAL;
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int
 253 fsl_edma2_irq_init(struct platform_device *pdev,
 254                    struct fsl_edma_engine *fsl_edma)
 255 {
 256         int i, ret, irq;
 257         int count;
 258
 259         edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
 260
 261         count = platform_irq_count(pdev);
 262         dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
 263         if (count <= 2) {
 264                 dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
 265                 return -EINVAL;
 266         }
 267         /*
 268          * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
 269          * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
 270          * For now, just simply request irq without IRQF_SHARED flag, since 16
 271          * channels are enough on i.mx7ulp whose M4 domain own some peripherals.
 272          */
 273         for (i = 0; i < count; i++) {
 274                 irq = platform_get_irq(pdev, i);
 275                 if (irq < 0)
 276                         return -ENXIO;
 277
 278                 /* The last IRQ is for eDMA err */
 279                 if (i == count - 1)
 280                         ret = devm_request_irq(&pdev->dev, irq,
 281                                                 fsl_edma_err_handler,
 282                                                 0, "eDMA2-ERR", fsl_edma);
 283                 else
 284                         ret = devm_request_irq(&pdev->dev, irq,
 285                                                 fsl_edma_tx_handler, 0,
 286                                                 fsl_edma->chans[i].chan_name,
 287                                                 fsl_edma);
 288                 if (ret)
 289                         return ret;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static void fsl_edma_irq_exit(
 296                 struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 297 {
 298         if (fsl_edma->txirq == fsl_edma->errirq) {
 299                 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
 300         } else {
 301                 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
 302                 devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma);
 303         }
 304 }
 305
 306 static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
 307 {
 308         int i;
 309
 310         for (i = 0; i < nr_clocks; i++)
 311                 clk_disable_unprepare(fsl_edma->muxclk[i]);
 312 }
 313
 314 static struct fsl_edma_drvdata vf610_data = {
 315         .dmamuxs = DMAMUX_NR,
 316         .flags = FSL_EDMA_DRV_WRAP_IO,
 317         .chreg_off = EDMA_TCD,
 318         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 319         .setup_irq = fsl_edma_irq_init,
 320 };
 321
 322 static struct fsl_edma_drvdata ls1028a_data = {
 323         .dmamuxs = DMAMUX_NR,
 324         .flags = FSL_EDMA_DRV_MUX_SWAP | FSL_EDMA_DRV_WRAP_IO,
 325         .chreg_off = EDMA_TCD,
 326         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 327         .setup_irq = fsl_edma_irq_init,
 328 };
 329
 330 static struct fsl_edma_drvdata imx7ulp_data = {
 331         .dmamuxs = 1,
 332         .chreg_off = EDMA_TCD,
 333         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 334         .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32,
 335         .setup_irq = fsl_edma2_irq_init,
 336 };
 337
 338 static struct fsl_edma_drvdata imx8qm_data = {
 339         .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3,
 340         .chreg_space_sz = 0x10000,
 341         .chreg_off = 0x10000,
 342         .setup_irq = fsl_edma3_irq_init,
 343 };
 344
 345 static struct fsl_edma_drvdata imx8qm_audio_data = {
 346         .flags = FSL_EDMA_DRV_QUIRK_SWAPPED | FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3,
 347         .chreg_space_sz = 0x10000,
 348         .chreg_off = 0x10000,
 349         .setup_irq = fsl_edma3_irq_init,
 350 };
 351
 352 static struct fsl_edma_drvdata imx93_data3 = {
 353         .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3,
 354         .chreg_space_sz = 0x10000,
 355         .chreg_off = 0x10000,
 356         .setup_irq = fsl_edma3_irq_init,
 357 };
 358
 359 static struct fsl_edma_drvdata imx93_data4 = {
 360         .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4,
 361         .chreg_space_sz = 0x8000,
 362         .chreg_off = 0x10000,
 363         .setup_irq = fsl_edma3_irq_init,
 364 };
 365
 366 static const struct of_device_id fsl_edma_dt_ids[] = {
 367         { .compatible = "fsl,vf610-edma", .data = &vf610_data},
 368         { .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
 369         { .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
 370         { .compatible = "fsl,imx8qm-edma", .data = &imx8qm_data},
 371         { .compatible = "fsl,imx8qm-adma", .data = &imx8qm_audio_data},
 372         { .compatible = "fsl,imx93-edma3", .data = &imx93_data3},
 373         { .compatible = "fsl,imx93-edma4", .data = &imx93_data4},
 374         { /* sentinel */ }
 375 };
 376 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
 377
 378 static int fsl_edma3_attach_pd(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 379 {
 380         struct fsl_edma_chan *fsl_chan;
 381         struct device_link *link;
 382         struct device *pd_chan;
 383         struct device *dev;
 384         int i;
 385
 386         dev = &pdev->dev;
 387
 388         for (i = 0; i < fsl_edma->n_chans; i++) {
 389                 if (fsl_edma->chan_masked & BIT(i))
 390                         continue;
 391
 392                 fsl_chan = &fsl_edma->chans[i];
 393
 394                 pd_chan = dev_pm_domain_attach_by_id(dev, i);
 395                 if (IS_ERR_OR_NULL(pd_chan)) {
 396                         dev_err(dev, "Failed attach pd %d\n", i);
 397                         return -EINVAL;
 398                 }
 399
 400                 link = device_link_add(dev, pd_chan, DL_FLAG_STATELESS |
 401                                              DL_FLAG_PM_RUNTIME |
 402                                              DL_FLAG_RPM_ACTIVE);
 403                 if (!link) {
 404                         dev_err(dev, "Failed to add device_link to %d\n", i);
 405                         return -EINVAL;
 406                 }
 407
 408                 fsl_chan->pd_dev = pd_chan;
 409
 410                 pm_runtime_use_autosuspend(fsl_chan->pd_dev);
 411                 pm_runtime_set_autosuspend_delay(fsl_chan->pd_dev, 200);
 412                 pm_runtime_set_active(fsl_chan->pd_dev);
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int fsl_edma_probe(struct platform_device *pdev)
 419 {
 420         const struct of_device_id *of_id =
 421                         of_match_device(fsl_edma_dt_ids, &pdev->dev);
 422         struct device_node *np = pdev->dev.of_node;
 423         struct fsl_edma_engine *fsl_edma;
 424         const struct fsl_edma_drvdata *drvdata = NULL;
 425         u32 chan_mask[2] = {0, 0};
 426         struct edma_regs *regs;
 427         int chans;
 428         int ret, i;
 429
 430         if (of_id)
 431                 drvdata = of_id->data;
 432         if (!drvdata) {
 433                 dev_err(&pdev->dev, "unable to find driver data\n");
 434                 return -EINVAL;
 435         }
 436
 437         ret = of_property_read_u32(np, "dma-channels", &chans);
 438         if (ret) {
 439                 dev_err(&pdev->dev, "Can't get dma-channels.\n");
 440                 return ret;
 441         }
 442
 443         fsl_edma = devm_kzalloc(&pdev->dev, struct_size(fsl_edma, chans, chans),
 444                                 GFP_KERNEL);
 445         if (!fsl_edma)
 446                 return -ENOMEM;
 447
 448         fsl_edma->drvdata = drvdata;
 449         fsl_edma->n_chans = chans;
 450         mutex_init(&fsl_edma->fsl_edma_mutex);
 451
 452         fsl_edma->membase = devm_platform_ioremap_resource(pdev, 0);
 453         if (IS_ERR(fsl_edma->membase))
 454                 return PTR_ERR(fsl_edma->membase);
 455
 456         if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) {
 457                 fsl_edma_setup_regs(fsl_edma);
 458                 regs = &fsl_edma->regs;
 459         }
 460
 461         if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
 462                 fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
 463                 if (IS_ERR(fsl_edma->dmaclk)) {
 464                         dev_err(&pdev->dev, "Missing DMA block clock.\n");
 465                         return PTR_ERR(fsl_edma->dmaclk);
 466                 }
 467         }
 468
 469         if (drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) {
 470                 fsl_edma->chclk = devm_clk_get_enabled(&pdev->dev, "mp");
 471                 if (IS_ERR(fsl_edma->chclk)) {
 472                         dev_err(&pdev->dev, "Missing MP block clock.\n");
 473                         return PTR_ERR(fsl_edma->chclk);
 474                 }
 475         }
 476
 477         ret = of_property_read_variable_u32_array(np, "dma-channel-mask", chan_mask, 1, 2);
 478
 479         if (ret > 0) {
 480                 fsl_edma->chan_masked = chan_mask[1];
 481                 fsl_edma->chan_masked <<= 32;
 482                 fsl_edma->chan_masked |= chan_mask[0];
 483         }
 484
 485         for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
 486                 char clkname[32];
 487
 488                 /* eDMAv3 mux register move to TCD area if ch_mux exist */
 489                 if (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)
 490                         break;
 491
 492                 fsl_edma->muxbase[i] = devm_platform_ioremap_resource(pdev,
 493                                                                       1 + i);
 494                 if (IS_ERR(fsl_edma->muxbase[i])) {
 495                         /* on error: disable all previously enabled clks */
 496                         fsl_disable_clocks(fsl_edma, i);
 497                         return PTR_ERR(fsl_edma->muxbase[i]);
 498                 }
 499
 500                 sprintf(clkname, "dmamux%d", i);
 501                 fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname);
 502                 if (IS_ERR(fsl_edma->muxclk[i])) {
 503                         dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
 504                         /* on error: disable all previously enabled clks */
 505                         return PTR_ERR(fsl_edma->muxclk[i]);
 506                 }
 507         }
 508
 509         fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
 510
 511         if (drvdata->flags & FSL_EDMA_DRV_HAS_PD) {
 512                 ret = fsl_edma3_attach_pd(pdev, fsl_edma);
 513                 if (ret)
 514                         return ret;
 515         }
 516
 517         INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
 518         for (i = 0; i < fsl_edma->n_chans; i++) {
 519                 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 520                 int len;
 521
 522                 if (fsl_edma->chan_masked & BIT(i))
 523                         continue;
 524
 525                 snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d",
 526                                                            dev_name(&pdev->dev), i);
 527
 528                 fsl_chan->edma = fsl_edma;
 529                 fsl_chan->pm_state = RUNNING;
 530                 fsl_chan->slave_id = 0;
 531                 fsl_chan->idle = true;
 532                 fsl_chan->dma_dir = DMA_NONE;
 533                 fsl_chan->vchan.desc_free = fsl_edma_free_desc;
 534
 535                 len = (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) ?
 536                                 offsetof(struct fsl_edma3_ch_reg, tcd) : 0;
 537                 fsl_chan->tcd = fsl_edma->membase
 538                                 + i * drvdata->chreg_space_sz + drvdata->chreg_off + len;
 539
 540                 fsl_chan->pdev = pdev;
 541                 vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
 542
 543                 edma_write_tcdreg(fsl_chan, 0, csr);
 544                 fsl_edma_chan_mux(fsl_chan, 0, false);
 545         }
 546
 547         ret = fsl_edma->drvdata->setup_irq(pdev, fsl_edma);
 548         if (ret)
 549                 return ret;
 550
 551         dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
 552         dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
 553         dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
 554         dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask);
 555
 556         fsl_edma->dma_dev.dev = &pdev->dev;
 557         fsl_edma->dma_dev.device_alloc_chan_resources
 558                 = fsl_edma_alloc_chan_resources;
 559         fsl_edma->dma_dev.device_free_chan_resources
 560                 = fsl_edma_free_chan_resources;
 561         fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
 562         fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
 563         fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
 564         fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy;
 565         fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
 566         fsl_edma->dma_dev.device_pause = fsl_edma_pause;
 567         fsl_edma->dma_dev.device_resume = fsl_edma_resume;
 568         fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
 569         fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize;
 570         fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 571
 572         fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
 573         fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
 574
 575         if (drvdata->flags & FSL_EDMA_DRV_BUS_8BYTE) {
 576                 fsl_edma->dma_dev.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
 577                 fsl_edma->dma_dev.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
 578         }
 579
 580         fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 581         if (drvdata->flags & FSL_EDMA_DRV_DEV_TO_DEV)
 582                 fsl_edma->dma_dev.directions |= BIT(DMA_DEV_TO_DEV);
 583
 584         fsl_edma->dma_dev.copy_align = drvdata->flags & FSL_EDMA_DRV_ALIGN_64BYTE ?
 585                                         DMAENGINE_ALIGN_64_BYTES :
 586                                         DMAENGINE_ALIGN_32_BYTES;
 587
 588         /* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
 589         dma_set_max_seg_size(fsl_edma->dma_dev.dev, 0x3fff);
 590
 591         fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 592
 593         platform_set_drvdata(pdev, fsl_edma);
 594
 595         ret = dma_async_device_register(&fsl_edma->dma_dev);
 596         if (ret) {
 597                 dev_err(&pdev->dev,
 598                         "Can't register Freescale eDMA engine. (%d)\n", ret);
 599                 return ret;
 600         }
 601
 602         ret = of_dma_controller_register(np,
 603                         drvdata->flags & FSL_EDMA_DRV_SPLIT_REG ? fsl_edma3_xlate : fsl_edma_xlate,
 604                         fsl_edma);
 605         if (ret) {
 606                 dev_err(&pdev->dev,
 607                         "Can't register Freescale eDMA of_dma. (%d)\n", ret);
 608                 dma_async_device_unregister(&fsl_edma->dma_dev);
 609                 return ret;
 610         }
 611
 612         /* enable round robin arbitration */
 613         if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
 614                 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 615
 616         return 0;
 617 }
 618
 619 static int fsl_edma_remove(struct platform_device *pdev)
 620 {
 621         struct device_node *np = pdev->dev.of_node;
 622         struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
 623
 624         fsl_edma_irq_exit(pdev, fsl_edma);
 625         fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
 626         of_dma_controller_free(np);
 627         dma_async_device_unregister(&fsl_edma->dma_dev);
 628         fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
 629
 630         return 0;
 631 }
 632
 633 static int fsl_edma_suspend_late(struct device *dev)
 634 {
 635         struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
 636         struct fsl_edma_chan *fsl_chan;
 637         unsigned long flags;
 638         int i;
 639
 640         for (i = 0; i < fsl_edma->n_chans; i++) {
 641                 fsl_chan = &fsl_edma->chans[i];
 642                 if (fsl_edma->chan_masked & BIT(i))
 643                         continue;
 644                 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 645                 /* Make sure chan is idle or will force disable. */
 646                 if (unlikely(!fsl_chan->idle)) {
 647                         dev_warn(dev, "WARN: There is non-idle channel.");
 648                         fsl_edma_disable_request(fsl_chan);
 649                         fsl_edma_chan_mux(fsl_chan, 0, false);
 650                 }
 651
 652                 fsl_chan->pm_state = SUSPENDED;
 653                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 654         }
 655
 656         return 0;
 657 }
 658
 659 static int fsl_edma_resume_early(struct device *dev)
 660 {
 661         struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
 662         struct fsl_edma_chan *fsl_chan;
 663         struct edma_regs *regs = &fsl_edma->regs;
 664         int i;
 665
 666         for (i = 0; i < fsl_edma->n_chans; i++) {
 667                 fsl_chan = &fsl_edma->chans[i];
 668                 if (fsl_edma->chan_masked & BIT(i))
 669                         continue;
 670                 fsl_chan->pm_state = RUNNING;
 671                 edma_write_tcdreg(fsl_chan, 0, csr);
 672                 if (fsl_chan->slave_id != 0)
 673                         fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
 674         }
 675
 676         if (!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
 677                 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 678
 679         return 0;
 680 }
 681
 682 /*
 683  * eDMA provides the service to others, so it should be suspend late
 684  * and resume early. When eDMA suspend, all of the clients should stop
 685  * the DMA data transmission and let the channel idle.
 686  */
 687 static const struct dev_pm_ops fsl_edma_pm_ops = {
 688         .suspend_late   = fsl_edma_suspend_late,
 689         .resume_early   = fsl_edma_resume_early,
 690 };
 691
 692 static struct platform_driver fsl_edma_driver = {
 693         .driver         = {
 694                 .name   = "fsl-edma",
 695                 .of_match_table = fsl_edma_dt_ids,
 696                 .pm     = &fsl_edma_pm_ops,
 697         },
 698         .probe          = fsl_edma_probe,
 699         .remove         = fsl_edma_remove,
 700 };
 701
 702 static int __init fsl_edma_init(void)
 703 {
 704         return platform_driver_register(&fsl_edma_driver);
 705 }
 706 subsys_initcall(fsl_edma_init);
 707
 708 static void __exit fsl_edma_exit(void)
 709 {
 710         platform_driver_unregister(&fsl_edma_driver);
 711 }
 712 module_exit(fsl_edma_exit);
 713
 714 MODULE_ALIAS("platform:fsl-edma");
 715 MODULE_DESCRIPTION("Freescale eDMA engine driver");
 716 MODULE_LICENSE("GPL v2");