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 <dt-bindings/dma/fsl-edma.h>
  13 #include <linux/bitfield.h>
  14 #include <linux/module.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/clk.h>
  17 #include <linux/of.h>
  18 #include <linux/of_dma.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/pm_domain.h>
  22 #include <linux/property.h>
  23
  24 #include "fsl-edma-common.h"
  25
  26 static void fsl_edma_synchronize(struct dma_chan *chan)
  27 {
  28         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
  29
  30         vchan_synchronize(&fsl_chan->vchan);
  31 }
  32
  33 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
  34 {
  35         struct fsl_edma_engine *fsl_edma = dev_id;
  36         unsigned int intr, ch;
  37         struct edma_regs *regs = &fsl_edma->regs;
  38
  39         intr = edma_readl(fsl_edma, regs->intl);
  40         if (!intr)
  41                 return IRQ_NONE;
  42
  43         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
  44                 if (intr & (0x1 << ch)) {
  45                         edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint);
  46                         fsl_edma_tx_chan_handler(&fsl_edma->chans[ch]);
  47                 }
  48         }
  49         return IRQ_HANDLED;
  50 }
  51
  52 static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id)
  53 {
  54         struct fsl_edma_chan *fsl_chan = dev_id;
  55         unsigned int intr;
  56
  57         intr = edma_readl_chreg(fsl_chan, ch_int);
  58         if (!intr)
  59                 return IRQ_HANDLED;
  60
  61         edma_writel_chreg(fsl_chan, 1, ch_int);
  62
  63         fsl_edma_tx_chan_handler(fsl_chan);
  64
  65         return IRQ_HANDLED;
  66 }
  67
  68 static irqreturn_t fsl_edma2_tx_handler(int irq, void *devi_id)
  69 {
  70         struct fsl_edma_chan *fsl_chan = devi_id;
  71
  72         return fsl_edma_tx_handler(irq, fsl_chan->edma);
  73 }
  74
  75 static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id)
  76 {
  77         struct fsl_edma_engine *fsl_edma = dev_id;
  78         unsigned int err, ch;
  79         struct edma_regs *regs = &fsl_edma->regs;
  80
  81         err = edma_readl(fsl_edma, regs->errl);
  82         if (!err)
  83                 return IRQ_NONE;
  84
  85         for (ch = 0; ch < fsl_edma->n_chans; ch++) {
  86                 if (err & (0x1 << ch)) {
  87                         fsl_edma_disable_request(&fsl_edma->chans[ch]);
  88                         edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr);
  89                         fsl_edma_err_chan_handler(&fsl_edma->chans[ch]);
  90                 }
  91         }
  92         return IRQ_HANDLED;
  93 }
  94
  95 static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
  96 {
  97         if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED)
  98                 return IRQ_HANDLED;
  99
 100         return fsl_edma_err_handler(irq, dev_id);
 101 }
 102
 103 static bool fsl_edma_srcid_in_use(struct fsl_edma_engine *fsl_edma, u32 srcid)
 104 {
 105         struct fsl_edma_chan *fsl_chan;
 106         int i;
 107
 108         for (i = 0; i < fsl_edma->n_chans; i++) {
 109                 fsl_chan = &fsl_edma->chans[i];
 110
 111                 if (fsl_chan->srcid && srcid == fsl_chan->srcid) {
 112                         dev_err(&fsl_chan->pdev->dev, "The srcid is in use, can't use!");
 113                         return true;
 114                 }
 115         }
 116         return false;
 117 }
 118
 119 static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 120                 struct of_dma *ofdma)
 121 {
 122         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 123         struct dma_chan *chan, *_chan;
 124         struct fsl_edma_chan *fsl_chan;
 125         u32 dmamux_nr = fsl_edma->drvdata->dmamuxs;
 126         unsigned long chans_per_mux = fsl_edma->n_chans / dmamux_nr;
 127
 128         if (dma_spec->args_count != 2)
 129                 return NULL;
 130
 131         guard(mutex)(&fsl_edma->fsl_edma_mutex);
 132
 133         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
 134                 if (chan->client_count)
 135                         continue;
 136
 137                 if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[1]))
 138                         return NULL;
 139
 140                 if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
 141                         chan = dma_get_slave_channel(chan);
 142                         if (chan) {
 143                                 chan->device->privatecnt++;
 144                                 fsl_chan = to_fsl_edma_chan(chan);
 145                                 fsl_chan->srcid = dma_spec->args[1];
 146
 147                                 if (!fsl_chan->srcid) {
 148                                         dev_err(&fsl_chan->pdev->dev, "Invalidate srcid %d\n",
 149                                                 fsl_chan->srcid);
 150                                         return NULL;
 151                                 }
 152
 153                                 fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid,
 154                                                 true);
 155                                 return chan;
 156                         }
 157                 }
 158         }
 159         return NULL;
 160 }
 161
 162 static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
 163                                         struct of_dma *ofdma)
 164 {
 165         struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data;
 166         struct dma_chan *chan, *_chan;
 167         struct fsl_edma_chan *fsl_chan;
 168         bool b_chmux;
 169         int i;
 170
 171         if (dma_spec->args_count != 3)
 172                 return NULL;
 173
 174         b_chmux = !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX);
 175
 176         guard(mutex)(&fsl_edma->fsl_edma_mutex);
 177         list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels,
 178                                         device_node) {
 179
 180                 if (chan->client_count)
 181                         continue;
 182
 183                 fsl_chan = to_fsl_edma_chan(chan);
 184                 if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[0]))
 185                         return NULL;
 186                 i = fsl_chan - fsl_edma->chans;
 187
 188                 fsl_chan->priority = dma_spec->args[1];
 189                 fsl_chan->is_rxchan = dma_spec->args[2] & FSL_EDMA_RX;
 190                 fsl_chan->is_remote = dma_spec->args[2] & FSL_EDMA_REMOTE;
 191                 fsl_chan->is_multi_fifo = dma_spec->args[2] & FSL_EDMA_MULTI_FIFO;
 192
 193                 if ((dma_spec->args[2] & FSL_EDMA_EVEN_CH) && (i & 0x1))
 194                         continue;
 195
 196                 if ((dma_spec->args[2] & FSL_EDMA_ODD_CH) && !(i & 0x1))
 197                         continue;
 198
 199                 if (!b_chmux && i == dma_spec->args[0]) {
 200                         chan = dma_get_slave_channel(chan);
 201                         chan->device->privatecnt++;
 202                         return chan;
 203                 } else if (b_chmux && !fsl_chan->srcid) {
 204                         /* if controller support channel mux, choose a free channel */
 205                         chan = dma_get_slave_channel(chan);
 206                         chan->device->privatecnt++;
 207                         fsl_chan->srcid = dma_spec->args[0];
 208                         return chan;
 209                 }
 210         }
 211         return NULL;
 212 }
 213
 214 static int
 215 fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 216 {
 217         int ret;
 218
 219         edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
 220
 221         fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx");
 222         if (fsl_edma->txirq < 0)
 223                 return fsl_edma->txirq;
 224
 225         fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err");
 226         if (fsl_edma->errirq < 0)
 227                 return fsl_edma->errirq;
 228
 229         if (fsl_edma->txirq == fsl_edma->errirq) {
 230                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 231                                 fsl_edma_irq_handler, 0, "eDMA", fsl_edma);
 232                 if (ret) {
 233                         dev_err(&pdev->dev, "Can't register eDMA IRQ.\n");
 234                         return ret;
 235                 }
 236         } else {
 237                 ret = devm_request_irq(&pdev->dev, fsl_edma->txirq,
 238                                 fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma);
 239                 if (ret) {
 240                         dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n");
 241                         return ret;
 242                 }
 243
 244                 ret = devm_request_irq(&pdev->dev, fsl_edma->errirq,
 245                                 fsl_edma_err_handler, 0, "eDMA err", fsl_edma);
 246                 if (ret) {
 247                         dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n");
 248                         return ret;
 249                 }
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int fsl_edma3_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 256 {
 257         int i;
 258
 259         for (i = 0; i < fsl_edma->n_chans; i++) {
 260
 261                 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 262
 263                 if (fsl_edma->chan_masked & BIT(i))
 264                         continue;
 265
 266                 /* request channel irq */
 267                 fsl_chan->txirq = platform_get_irq(pdev, i);
 268                 if (fsl_chan->txirq < 0)
 269                         return  -EINVAL;
 270
 271                 fsl_chan->irq_handler = fsl_edma3_tx_handler;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int
 278 fsl_edma2_irq_init(struct platform_device *pdev,
 279                    struct fsl_edma_engine *fsl_edma)
 280 {
 281         int i, ret, irq;
 282         int count;
 283
 284         edma_writel(fsl_edma, ~0, fsl_edma->regs.intl);
 285
 286         count = platform_irq_count(pdev);
 287         dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
 288         if (count <= 2) {
 289                 dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
 290                 return -EINVAL;
 291         }
 292         /*
 293          * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
 294          * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
 295          * For now, just simply request irq without IRQF_SHARED flag, since 16
 296          * channels are enough on i.mx7ulp whose M4 domain own some peripherals.
 297          */
 298         for (i = 0; i < count; i++) {
 299                 irq = platform_get_irq(pdev, i);
 300                 ret = 0;
 301                 if (irq < 0)
 302                         return -ENXIO;
 303
 304                 /* The last IRQ is for eDMA err */
 305                 if (i == count - 1) {
 306                         ret = devm_request_irq(&pdev->dev, irq,
 307                                                 fsl_edma_err_handler,
 308                                                 0, "eDMA2-ERR", fsl_edma);
 309                 } else {
 310                         fsl_edma->chans[i].txirq = irq;
 311                         fsl_edma->chans[i].irq_handler = fsl_edma2_tx_handler;
 312                 }
 313
 314                 if (ret)
 315                         return ret;
 316         }
 317
 318         return 0;
 319 }
 320
 321 static void fsl_edma_irq_exit(
 322                 struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 323 {
 324         if (fsl_edma->txirq == fsl_edma->errirq) {
 325                 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
 326         } else {
 327                 devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma);
 328                 devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma);
 329         }
 330 }
 331
 332 static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks)
 333 {
 334         int i;
 335
 336         for (i = 0; i < nr_clocks; i++)
 337                 clk_disable_unprepare(fsl_edma->muxclk[i]);
 338 }
 339
 340 static struct fsl_edma_drvdata vf610_data = {
 341         .dmamuxs = DMAMUX_NR,
 342         .flags = FSL_EDMA_DRV_WRAP_IO,
 343         .chreg_off = EDMA_TCD,
 344         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 345         .setup_irq = fsl_edma_irq_init,
 346 };
 347
 348 static struct fsl_edma_drvdata ls1028a_data = {
 349         .dmamuxs = DMAMUX_NR,
 350         .flags = FSL_EDMA_DRV_MUX_SWAP | FSL_EDMA_DRV_WRAP_IO,
 351         .chreg_off = EDMA_TCD,
 352         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 353         .setup_irq = fsl_edma_irq_init,
 354 };
 355
 356 static struct fsl_edma_drvdata imx7ulp_data = {
 357         .dmamuxs = 1,
 358         .chreg_off = EDMA_TCD,
 359         .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd),
 360         .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32,
 361         .setup_irq = fsl_edma2_irq_init,
 362 };
 363
 364 static struct fsl_edma_drvdata imx8qm_data = {
 365         .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3 | FSL_EDMA_DRV_MEM_REMOTE,
 366         .chreg_space_sz = 0x10000,
 367         .chreg_off = 0x10000,
 368         .setup_irq = fsl_edma3_irq_init,
 369 };
 370
 371 static struct fsl_edma_drvdata imx8ulp_data = {
 372         .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_CHCLK | FSL_EDMA_DRV_HAS_DMACLK |
 373                  FSL_EDMA_DRV_EDMA3,
 374         .chreg_space_sz = 0x10000,
 375         .chreg_off = 0x10000,
 376         .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux),
 377         .mux_skip = 0x10000,
 378         .setup_irq = fsl_edma3_irq_init,
 379 };
 380
 381 static struct fsl_edma_drvdata imx93_data3 = {
 382         .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3,
 383         .chreg_space_sz = 0x10000,
 384         .chreg_off = 0x10000,
 385         .setup_irq = fsl_edma3_irq_init,
 386 };
 387
 388 static struct fsl_edma_drvdata imx93_data4 = {
 389         .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4,
 390         .chreg_space_sz = 0x8000,
 391         .chreg_off = 0x10000,
 392         .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux),
 393         .mux_skip = 0x8000,
 394         .setup_irq = fsl_edma3_irq_init,
 395 };
 396
 397 static struct fsl_edma_drvdata imx95_data5 = {
 398         .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4 |
 399                  FSL_EDMA_DRV_TCD64,
 400         .chreg_space_sz = 0x8000,
 401         .chreg_off = 0x10000,
 402         .mux_off = 0x200,
 403         .mux_skip = sizeof(u32),
 404         .setup_irq = fsl_edma3_irq_init,
 405 };
 406
 407 static const struct of_device_id fsl_edma_dt_ids[] = {
 408         { .compatible = "fsl,vf610-edma", .data = &vf610_data},
 409         { .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data},
 410         { .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
 411         { .compatible = "fsl,imx8qm-edma", .data = &imx8qm_data},
 412         { .compatible = "fsl,imx8ulp-edma", .data = &imx8ulp_data},
 413         { .compatible = "fsl,imx93-edma3", .data = &imx93_data3},
 414         { .compatible = "fsl,imx93-edma4", .data = &imx93_data4},
 415         { .compatible = "fsl,imx95-edma5", .data = &imx95_data5},
 416         { /* sentinel */ }
 417 };
 418 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
 419
 420 static int fsl_edma3_attach_pd(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 421 {
 422         struct fsl_edma_chan *fsl_chan;
 423         struct device_link *link;
 424         struct device *pd_chan;
 425         struct device *dev;
 426         int i;
 427
 428         dev = &pdev->dev;
 429
 430         for (i = 0; i < fsl_edma->n_chans; i++) {
 431                 if (fsl_edma->chan_masked & BIT(i))
 432                         continue;
 433
 434                 fsl_chan = &fsl_edma->chans[i];
 435
 436                 pd_chan = dev_pm_domain_attach_by_id(dev, i);
 437                 if (IS_ERR_OR_NULL(pd_chan)) {
 438                         dev_err(dev, "Failed attach pd %d\n", i);
 439                         return -EINVAL;
 440                 }
 441
 442                 link = device_link_add(dev, pd_chan, DL_FLAG_STATELESS |
 443                                              DL_FLAG_PM_RUNTIME |
 444                                              DL_FLAG_RPM_ACTIVE);
 445                 if (!link) {
 446                         dev_err(dev, "Failed to add device_link to %d\n", i);
 447                         return -EINVAL;
 448                 }
 449
 450                 fsl_chan->pd_dev = pd_chan;
 451
 452                 pm_runtime_use_autosuspend(fsl_chan->pd_dev);
 453                 pm_runtime_set_autosuspend_delay(fsl_chan->pd_dev, 200);
 454                 pm_runtime_set_active(fsl_chan->pd_dev);
 455         }
 456
 457         return 0;
 458 }
 459
 460 static int fsl_edma_probe(struct platform_device *pdev)
 461 {
 462         struct device_node *np = pdev->dev.of_node;
 463         struct fsl_edma_engine *fsl_edma;
 464         const struct fsl_edma_drvdata *drvdata = NULL;
 465         u32 chan_mask[2] = {0, 0};
 466         char clk_name[36];
 467         struct edma_regs *regs;
 468         int chans;
 469         int ret, i;
 470
 471         drvdata = device_get_match_data(&pdev->dev);
 472         if (!drvdata) {
 473                 dev_err(&pdev->dev, "unable to find driver data\n");
 474                 return -EINVAL;
 475         }
 476
 477         ret = of_property_read_u32(np, "dma-channels", &chans);
 478         if (ret) {
 479                 dev_err(&pdev->dev, "Can't get dma-channels.\n");
 480                 return ret;
 481         }
 482
 483         fsl_edma = devm_kzalloc(&pdev->dev, struct_size(fsl_edma, chans, chans),
 484                                 GFP_KERNEL);
 485         if (!fsl_edma)
 486                 return -ENOMEM;
 487
 488         fsl_edma->drvdata = drvdata;
 489         fsl_edma->n_chans = chans;
 490         mutex_init(&fsl_edma->fsl_edma_mutex);
 491
 492         fsl_edma->membase = devm_platform_ioremap_resource(pdev, 0);
 493         if (IS_ERR(fsl_edma->membase))
 494                 return PTR_ERR(fsl_edma->membase);
 495
 496         if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) {
 497                 fsl_edma_setup_regs(fsl_edma);
 498                 regs = &fsl_edma->regs;
 499         }
 500
 501         if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) {
 502                 fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma");
 503                 if (IS_ERR(fsl_edma->dmaclk)) {
 504                         dev_err(&pdev->dev, "Missing DMA block clock.\n");
 505                         return PTR_ERR(fsl_edma->dmaclk);
 506                 }
 507         }
 508
 509         ret = of_property_read_variable_u32_array(np, "dma-channel-mask", chan_mask, 1, 2);
 510
 511         if (ret > 0) {
 512                 fsl_edma->chan_masked = chan_mask[1];
 513                 fsl_edma->chan_masked <<= 32;
 514                 fsl_edma->chan_masked |= chan_mask[0];
 515         }
 516
 517         for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
 518                 char clkname[32];
 519
 520                 /* eDMAv3 mux register move to TCD area if ch_mux exist */
 521                 if (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)
 522                         break;
 523
 524                 fsl_edma->muxbase[i] = devm_platform_ioremap_resource(pdev,
 525                                                                       1 + i);
 526                 if (IS_ERR(fsl_edma->muxbase[i])) {
 527                         /* on error: disable all previously enabled clks */
 528                         fsl_disable_clocks(fsl_edma, i);
 529                         return PTR_ERR(fsl_edma->muxbase[i]);
 530                 }
 531
 532                 sprintf(clkname, "dmamux%d", i);
 533                 fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname);
 534                 if (IS_ERR(fsl_edma->muxclk[i])) {
 535                         dev_err(&pdev->dev, "Missing DMAMUX block clock.\n");
 536                         /* on error: disable all previously enabled clks */
 537                         return PTR_ERR(fsl_edma->muxclk[i]);
 538                 }
 539         }
 540
 541         fsl_edma->big_endian = of_property_read_bool(np, "big-endian");
 542
 543         if (drvdata->flags & FSL_EDMA_DRV_HAS_PD) {
 544                 ret = fsl_edma3_attach_pd(pdev, fsl_edma);
 545                 if (ret)
 546                         return ret;
 547         }
 548
 549         if (drvdata->flags & FSL_EDMA_DRV_TCD64)
 550                 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 551
 552         INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
 553         for (i = 0; i < fsl_edma->n_chans; i++) {
 554                 struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 555                 int len;
 556
 557                 if (fsl_edma->chan_masked & BIT(i))
 558                         continue;
 559
 560                 snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d",
 561                                                            dev_name(&pdev->dev), i);
 562
 563                 fsl_chan->edma = fsl_edma;
 564                 fsl_chan->pm_state = RUNNING;
 565                 fsl_chan->srcid = 0;
 566                 fsl_chan->dma_dir = DMA_NONE;
 567                 fsl_chan->vchan.desc_free = fsl_edma_free_desc;
 568
 569                 len = (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) ?
 570                                 offsetof(struct fsl_edma3_ch_reg, tcd) : 0;
 571                 fsl_chan->tcd = fsl_edma->membase
 572                                 + i * drvdata->chreg_space_sz + drvdata->chreg_off + len;
 573                 fsl_chan->mux_addr = fsl_edma->membase + drvdata->mux_off + i * drvdata->mux_skip;
 574
 575                 if (drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) {
 576                         snprintf(clk_name, sizeof(clk_name), "ch%02d", i);
 577                         fsl_chan->clk = devm_clk_get_enabled(&pdev->dev,
 578                                                              (const char *)clk_name);
 579
 580                         if (IS_ERR(fsl_chan->clk))
 581                                 return PTR_ERR(fsl_chan->clk);
 582                 }
 583                 fsl_chan->pdev = pdev;
 584                 vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
 585
 586                 edma_write_tcdreg(fsl_chan, cpu_to_le32(0), csr);
 587                 fsl_edma_chan_mux(fsl_chan, 0, false);
 588                 if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK)
 589                         clk_disable_unprepare(fsl_chan->clk);
 590         }
 591
 592         ret = fsl_edma->drvdata->setup_irq(pdev, fsl_edma);
 593         if (ret)
 594                 return ret;
 595
 596         dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
 597         dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
 598         dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
 599         dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask);
 600
 601         fsl_edma->dma_dev.dev = &pdev->dev;
 602         fsl_edma->dma_dev.device_alloc_chan_resources
 603                 = fsl_edma_alloc_chan_resources;
 604         fsl_edma->dma_dev.device_free_chan_resources
 605                 = fsl_edma_free_chan_resources;
 606         fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
 607         fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
 608         fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
 609         fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy;
 610         fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
 611         fsl_edma->dma_dev.device_pause = fsl_edma_pause;
 612         fsl_edma->dma_dev.device_resume = fsl_edma_resume;
 613         fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
 614         fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize;
 615         fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 616
 617         fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
 618         fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
 619
 620         if (drvdata->flags & FSL_EDMA_DRV_BUS_8BYTE) {
 621                 fsl_edma->dma_dev.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
 622                 fsl_edma->dma_dev.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
 623         }
 624
 625         fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 626         if (drvdata->flags & FSL_EDMA_DRV_DEV_TO_DEV)
 627                 fsl_edma->dma_dev.directions |= BIT(DMA_DEV_TO_DEV);
 628
 629         fsl_edma->dma_dev.copy_align = drvdata->flags & FSL_EDMA_DRV_ALIGN_64BYTE ?
 630                                         DMAENGINE_ALIGN_64_BYTES :
 631                                         DMAENGINE_ALIGN_32_BYTES;
 632
 633         /* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
 634         dma_set_max_seg_size(fsl_edma->dma_dev.dev,
 635                              FIELD_GET(EDMA_TCD_ITER_MASK, EDMA_TCD_ITER_MASK));
 636
 637         fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 638
 639         platform_set_drvdata(pdev, fsl_edma);
 640
 641         ret = dma_async_device_register(&fsl_edma->dma_dev);
 642         if (ret) {
 643                 dev_err(&pdev->dev,
 644                         "Can't register Freescale eDMA engine. (%d)\n", ret);
 645                 return ret;
 646         }
 647
 648         ret = of_dma_controller_register(np,
 649                         drvdata->flags & FSL_EDMA_DRV_SPLIT_REG ? fsl_edma3_xlate : fsl_edma_xlate,
 650                         fsl_edma);
 651         if (ret) {
 652                 dev_err(&pdev->dev,
 653                         "Can't register Freescale eDMA of_dma. (%d)\n", ret);
 654                 dma_async_device_unregister(&fsl_edma->dma_dev);
 655                 return ret;
 656         }
 657
 658         /* enable round robin arbitration */
 659         if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
 660                 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 661
 662         return 0;
 663 }
 664
 665 static void fsl_edma_remove(struct platform_device *pdev)
 666 {
 667         struct device_node *np = pdev->dev.of_node;
 668         struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev);
 669
 670         fsl_edma_irq_exit(pdev, fsl_edma);
 671         fsl_edma_cleanup_vchan(&fsl_edma->dma_dev);
 672         of_dma_controller_free(np);
 673         dma_async_device_unregister(&fsl_edma->dma_dev);
 674         fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs);
 675 }
 676
 677 static int fsl_edma_suspend_late(struct device *dev)
 678 {
 679         struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
 680         struct fsl_edma_chan *fsl_chan;
 681         unsigned long flags;
 682         int i;
 683
 684         for (i = 0; i < fsl_edma->n_chans; i++) {
 685                 fsl_chan = &fsl_edma->chans[i];
 686                 if (fsl_edma->chan_masked & BIT(i))
 687                         continue;
 688                 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 689                 /* Make sure chan is idle or will force disable. */
 690                 if (unlikely(fsl_chan->status == DMA_IN_PROGRESS)) {
 691                         dev_warn(dev, "WARN: There is non-idle channel.");
 692                         fsl_edma_disable_request(fsl_chan);
 693                         fsl_edma_chan_mux(fsl_chan, 0, false);
 694                 }
 695
 696                 fsl_chan->pm_state = SUSPENDED;
 697                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 698         }
 699
 700         return 0;
 701 }
 702
 703 static int fsl_edma_resume_early(struct device *dev)
 704 {
 705         struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
 706         struct fsl_edma_chan *fsl_chan;
 707         struct edma_regs *regs = &fsl_edma->regs;
 708         int i;
 709
 710         for (i = 0; i < fsl_edma->n_chans; i++) {
 711                 fsl_chan = &fsl_edma->chans[i];
 712                 if (fsl_edma->chan_masked & BIT(i))
 713                         continue;
 714                 fsl_chan->pm_state = RUNNING;
 715                 edma_write_tcdreg(fsl_chan, 0, csr);
 716                 if (fsl_chan->srcid != 0)
 717                         fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid, true);
 718         }
 719
 720         if (!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
 721                 edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 722
 723         return 0;
 724 }
 725
 726 /*
 727  * eDMA provides the service to others, so it should be suspend late
 728  * and resume early. When eDMA suspend, all of the clients should stop
 729  * the DMA data transmission and let the channel idle.
 730  */
 731 static const struct dev_pm_ops fsl_edma_pm_ops = {
 732         .suspend_late   = fsl_edma_suspend_late,
 733         .resume_early   = fsl_edma_resume_early,
 734 };
 735
 736 static struct platform_driver fsl_edma_driver = {
 737         .driver         = {
 738                 .name   = "fsl-edma",
 739                 .of_match_table = fsl_edma_dt_ids,
 740                 .pm     = &fsl_edma_pm_ops,
 741         },
 742         .probe          = fsl_edma_probe,
 743         .remove         = fsl_edma_remove,
 744 };
 745
 746 static int __init fsl_edma_init(void)
 747 {
 748         return platform_driver_register(&fsl_edma_driver);
 749 }
 750 subsys_initcall(fsl_edma_init);
 751
 752 static void __exit fsl_edma_exit(void)
 753 {
 754         platform_driver_unregister(&fsl_edma_driver);
 755 }
 756 module_exit(fsl_edma_exit);
 757
 758 MODULE_ALIAS("platform:fsl-edma");
 759 MODULE_DESCRIPTION("Freescale eDMA engine driver");
 760 MODULE_LICENSE("GPL v2");