drivers/dma/imx-dma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // drivers/dma/imx-dma.c
   4 //
   5 // This file contains a driver for the Freescale i.MX DMA engine
   6 // found on i.MX1/21/27
   7 //
   8 // Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
   9 // Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
  10
  11 #include <linux/err.h>
  12 #include <linux/init.h>
  13 #include <linux/types.h>
  14 #include <linux/mm.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/clk.h>
  22 #include <linux/dmaengine.h>
  23 #include <linux/module.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_dma.h>
  26
  27 #include <asm/irq.h>
  28 #include <linux/platform_data/dma-imx.h>
  29
  30 #include "dmaengine.h"
  31 #define IMXDMA_MAX_CHAN_DESCRIPTORS     16
  32 #define IMX_DMA_CHANNELS  16
  33
  34 #define IMX_DMA_2D_SLOTS        2
  35 #define IMX_DMA_2D_SLOT_A       0
  36 #define IMX_DMA_2D_SLOT_B       1
  37
  38 #define IMX_DMA_LENGTH_LOOP     ((unsigned int)-1)
  39 #define IMX_DMA_MEMSIZE_32      (0 << 4)
  40 #define IMX_DMA_MEMSIZE_8       (1 << 4)
  41 #define IMX_DMA_MEMSIZE_16      (2 << 4)
  42 #define IMX_DMA_TYPE_LINEAR     (0 << 10)
  43 #define IMX_DMA_TYPE_2D         (1 << 10)
  44 #define IMX_DMA_TYPE_FIFO       (2 << 10)
  45
  46 #define IMX_DMA_ERR_BURST     (1 << 0)
  47 #define IMX_DMA_ERR_REQUEST   (1 << 1)
  48 #define IMX_DMA_ERR_TRANSFER  (1 << 2)
  49 #define IMX_DMA_ERR_BUFFER    (1 << 3)
  50 #define IMX_DMA_ERR_TIMEOUT   (1 << 4)
  51
  52 #define DMA_DCR     0x00                /* Control Register */
  53 #define DMA_DISR    0x04                /* Interrupt status Register */
  54 #define DMA_DIMR    0x08                /* Interrupt mask Register */
  55 #define DMA_DBTOSR  0x0c                /* Burst timeout status Register */
  56 #define DMA_DRTOSR  0x10                /* Request timeout Register */
  57 #define DMA_DSESR   0x14                /* Transfer Error Status Register */
  58 #define DMA_DBOSR   0x18                /* Buffer overflow status Register */
  59 #define DMA_DBTOCR  0x1c                /* Burst timeout control Register */
  60 #define DMA_WSRA    0x40                /* W-Size Register A */
  61 #define DMA_XSRA    0x44                /* X-Size Register A */
  62 #define DMA_YSRA    0x48                /* Y-Size Register A */
  63 #define DMA_WSRB    0x4c                /* W-Size Register B */
  64 #define DMA_XSRB    0x50                /* X-Size Register B */
  65 #define DMA_YSRB    0x54                /* Y-Size Register B */
  66 #define DMA_SAR(x)  (0x80 + ((x) << 6)) /* Source Address Registers */
  67 #define DMA_DAR(x)  (0x84 + ((x) << 6)) /* Destination Address Registers */
  68 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
  69 #define DMA_CCR(x)  (0x8c + ((x) << 6)) /* Control Registers */
  70 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
  71 #define DMA_BLR(x)  (0x94 + ((x) << 6)) /* Burst length Registers */
  72 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
  73 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
  74 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
  75
  76 #define DCR_DRST           (1<<1)
  77 #define DCR_DEN            (1<<0)
  78 #define DBTOCR_EN          (1<<15)
  79 #define DBTOCR_CNT(x)      ((x) & 0x7fff)
  80 #define CNTR_CNT(x)        ((x) & 0xffffff)
  81 #define CCR_ACRPT          (1<<14)
  82 #define CCR_DMOD_LINEAR    (0x0 << 12)
  83 #define CCR_DMOD_2D        (0x1 << 12)
  84 #define CCR_DMOD_FIFO      (0x2 << 12)
  85 #define CCR_DMOD_EOBFIFO   (0x3 << 12)
  86 #define CCR_SMOD_LINEAR    (0x0 << 10)
  87 #define CCR_SMOD_2D        (0x1 << 10)
  88 #define CCR_SMOD_FIFO      (0x2 << 10)
  89 #define CCR_SMOD_EOBFIFO   (0x3 << 10)
  90 #define CCR_MDIR_DEC       (1<<9)
  91 #define CCR_MSEL_B         (1<<8)
  92 #define CCR_DSIZ_32        (0x0 << 6)
  93 #define CCR_DSIZ_8         (0x1 << 6)
  94 #define CCR_DSIZ_16        (0x2 << 6)
  95 #define CCR_SSIZ_32        (0x0 << 4)
  96 #define CCR_SSIZ_8         (0x1 << 4)
  97 #define CCR_SSIZ_16        (0x2 << 4)
  98 #define CCR_REN            (1<<3)
  99 #define CCR_RPT            (1<<2)
 100 #define CCR_FRC            (1<<1)
 101 #define CCR_CEN            (1<<0)
 102 #define RTOR_EN            (1<<15)
 103 #define RTOR_CLK           (1<<14)
 104 #define RTOR_PSC           (1<<13)
 105
 106 enum  imxdma_prep_type {
 107         IMXDMA_DESC_MEMCPY,
 108         IMXDMA_DESC_INTERLEAVED,
 109         IMXDMA_DESC_SLAVE_SG,
 110         IMXDMA_DESC_CYCLIC,
 111 };
 112
 113 struct imx_dma_2d_config {
 114         u16             xsr;
 115         u16             ysr;
 116         u16             wsr;
 117         int             count;
 118 };
 119
 120 struct imxdma_desc {
 121         struct list_head                node;
 122         struct dma_async_tx_descriptor  desc;
 123         enum dma_status                 status;
 124         dma_addr_t                      src;
 125         dma_addr_t                      dest;
 126         size_t                          len;
 127         enum dma_transfer_direction     direction;
 128         enum imxdma_prep_type           type;
 129         /* For memcpy and interleaved */
 130         unsigned int                    config_port;
 131         unsigned int                    config_mem;
 132         /* For interleaved transfers */
 133         unsigned int                    x;
 134         unsigned int                    y;
 135         unsigned int                    w;
 136         /* For slave sg and cyclic */
 137         struct scatterlist              *sg;
 138         unsigned int                    sgcount;
 139 };
 140
 141 struct imxdma_channel {
 142         int                             hw_chaining;
 143         struct timer_list               watchdog;
 144         struct imxdma_engine            *imxdma;
 145         unsigned int                    channel;
 146
 147         struct tasklet_struct           dma_tasklet;
 148         struct list_head                ld_free;
 149         struct list_head                ld_queue;
 150         struct list_head                ld_active;
 151         int                             descs_allocated;
 152         enum dma_slave_buswidth         word_size;
 153         dma_addr_t                      per_address;
 154         u32                             watermark_level;
 155         struct dma_chan                 chan;
 156         struct dma_async_tx_descriptor  desc;
 157         enum dma_status                 status;
 158         int                             dma_request;
 159         struct scatterlist              *sg_list;
 160         u32                             ccr_from_device;
 161         u32                             ccr_to_device;
 162         bool                            enabled_2d;
 163         int                             slot_2d;
 164         unsigned int                    irq;
 165         struct dma_slave_config         config;
 166 };
 167
 168 enum imx_dma_type {
 169         IMX1_DMA,
 170         IMX21_DMA,
 171         IMX27_DMA,
 172 };
 173
 174 struct imxdma_engine {
 175         struct device                   *dev;
 176         struct device_dma_parameters    dma_parms;
 177         struct dma_device               dma_device;
 178         void __iomem                    *base;
 179         struct clk                      *dma_ahb;
 180         struct clk                      *dma_ipg;
 181         spinlock_t                      lock;
 182         struct imx_dma_2d_config        slots_2d[IMX_DMA_2D_SLOTS];
 183         struct imxdma_channel           channel[IMX_DMA_CHANNELS];
 184         enum imx_dma_type               devtype;
 185         unsigned int                    irq;
 186         unsigned int                    irq_err;
 187
 188 };
 189
 190 struct imxdma_filter_data {
 191         struct imxdma_engine    *imxdma;
 192         int                      request;
 193 };
 194
 195 static const struct platform_device_id imx_dma_devtype[] = {
 196         {
 197                 .name = "imx1-dma",
 198                 .driver_data = IMX1_DMA,
 199         }, {
 200                 .name = "imx21-dma",
 201                 .driver_data = IMX21_DMA,
 202         }, {
 203                 .name = "imx27-dma",
 204                 .driver_data = IMX27_DMA,
 205         }, {
 206                 /* sentinel */
 207         }
 208 };
 209 MODULE_DEVICE_TABLE(platform, imx_dma_devtype);
 210
 211 static const struct of_device_id imx_dma_of_dev_id[] = {
 212         {
 213                 .compatible = "fsl,imx1-dma",
 214                 .data = &imx_dma_devtype[IMX1_DMA],
 215         }, {
 216                 .compatible = "fsl,imx21-dma",
 217                 .data = &imx_dma_devtype[IMX21_DMA],
 218         }, {
 219                 .compatible = "fsl,imx27-dma",
 220                 .data = &imx_dma_devtype[IMX27_DMA],
 221         }, {
 222                 /* sentinel */
 223         }
 224 };
 225 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
 226
 227 static inline int is_imx1_dma(struct imxdma_engine *imxdma)
 228 {
 229         return imxdma->devtype == IMX1_DMA;
 230 }
 231
 232 static inline int is_imx27_dma(struct imxdma_engine *imxdma)
 233 {
 234         return imxdma->devtype == IMX27_DMA;
 235 }
 236
 237 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
 238 {
 239         return container_of(chan, struct imxdma_channel, chan);
 240 }
 241
 242 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
 243 {
 244         struct imxdma_desc *desc;
 245
 246         if (!list_empty(&imxdmac->ld_active)) {
 247                 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
 248                                         node);
 249                 if (desc->type == IMXDMA_DESC_CYCLIC)
 250                         return true;
 251         }
 252         return false;
 253 }
 254
 255
 256
 257 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
 258                              unsigned offset)
 259 {
 260         __raw_writel(val, imxdma->base + offset);
 261 }
 262
 263 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
 264 {
 265         return __raw_readl(imxdma->base + offset);
 266 }
 267
 268 static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
 269 {
 270         struct imxdma_engine *imxdma = imxdmac->imxdma;
 271
 272         if (is_imx27_dma(imxdma))
 273                 return imxdmac->hw_chaining;
 274         else
 275                 return 0;
 276 }
 277
 278 /*
 279  * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
 280  */
 281 static inline void imxdma_sg_next(struct imxdma_desc *d)
 282 {
 283         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 284         struct imxdma_engine *imxdma = imxdmac->imxdma;
 285         struct scatterlist *sg = d->sg;
 286         size_t now;
 287
 288         now = min_t(size_t, d->len, sg_dma_len(sg));
 289         if (d->len != IMX_DMA_LENGTH_LOOP)
 290                 d->len -= now;
 291
 292         if (d->direction == DMA_DEV_TO_MEM)
 293                 imx_dmav1_writel(imxdma, sg->dma_address,
 294                                  DMA_DAR(imxdmac->channel));
 295         else
 296                 imx_dmav1_writel(imxdma, sg->dma_address,
 297                                  DMA_SAR(imxdmac->channel));
 298
 299         imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
 300
 301         dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
 302                 "size 0x%08x\n", __func__, imxdmac->channel,
 303                  imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
 304                  imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
 305                  imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
 306 }
 307
 308 static void imxdma_enable_hw(struct imxdma_desc *d)
 309 {
 310         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 311         struct imxdma_engine *imxdma = imxdmac->imxdma;
 312         int channel = imxdmac->channel;
 313         unsigned long flags;
 314
 315         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 316
 317         local_irq_save(flags);
 318
 319         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 320         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
 321                          ~(1 << channel), DMA_DIMR);
 322         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
 323                          CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
 324
 325         if (!is_imx1_dma(imxdma) &&
 326                         d->sg && imxdma_hw_chain(imxdmac)) {
 327                 d->sg = sg_next(d->sg);
 328                 if (d->sg) {
 329                         u32 tmp;
 330                         imxdma_sg_next(d);
 331                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
 332                         imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
 333                                          DMA_CCR(channel));
 334                 }
 335         }
 336
 337         local_irq_restore(flags);
 338 }
 339
 340 static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
 341 {
 342         struct imxdma_engine *imxdma = imxdmac->imxdma;
 343         int channel = imxdmac->channel;
 344         unsigned long flags;
 345
 346         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 347
 348         if (imxdma_hw_chain(imxdmac))
 349                 del_timer(&imxdmac->watchdog);
 350
 351         local_irq_save(flags);
 352         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
 353                          (1 << channel), DMA_DIMR);
 354         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
 355                          ~CCR_CEN, DMA_CCR(channel));
 356         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 357         local_irq_restore(flags);
 358 }
 359
 360 static void imxdma_watchdog(struct timer_list *t)
 361 {
 362         struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog);
 363         struct imxdma_engine *imxdma = imxdmac->imxdma;
 364         int channel = imxdmac->channel;
 365
 366         imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
 367
 368         /* Tasklet watchdog error handler */
 369         tasklet_schedule(&imxdmac->dma_tasklet);
 370         dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
 371                 imxdmac->channel);
 372 }
 373
 374 static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
 375 {
 376         struct imxdma_engine *imxdma = dev_id;
 377         unsigned int err_mask;
 378         int i, disr;
 379         int errcode;
 380
 381         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 382
 383         err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
 384                    imx_dmav1_readl(imxdma, DMA_DRTOSR) |
 385                    imx_dmav1_readl(imxdma, DMA_DSESR)  |
 386                    imx_dmav1_readl(imxdma, DMA_DBOSR);
 387
 388         if (!err_mask)
 389                 return IRQ_HANDLED;
 390
 391         imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
 392
 393         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 394                 if (!(err_mask & (1 << i)))
 395                         continue;
 396                 errcode = 0;
 397
 398                 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
 399                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
 400                         errcode |= IMX_DMA_ERR_BURST;
 401                 }
 402                 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
 403                         imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
 404                         errcode |= IMX_DMA_ERR_REQUEST;
 405                 }
 406                 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
 407                         imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
 408                         errcode |= IMX_DMA_ERR_TRANSFER;
 409                 }
 410                 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
 411                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
 412                         errcode |= IMX_DMA_ERR_BUFFER;
 413                 }
 414                 /* Tasklet error handler */
 415                 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
 416
 417                 dev_warn(imxdma->dev,
 418                          "DMA timeout on channel %d -%s%s%s%s\n", i,
 419                          errcode & IMX_DMA_ERR_BURST ?    " burst" : "",
 420                          errcode & IMX_DMA_ERR_REQUEST ?  " request" : "",
 421                          errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
 422                          errcode & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
 423         }
 424         return IRQ_HANDLED;
 425 }
 426
 427 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
 428 {
 429         struct imxdma_engine *imxdma = imxdmac->imxdma;
 430         int chno = imxdmac->channel;
 431         struct imxdma_desc *desc;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&imxdma->lock, flags);
 435         if (list_empty(&imxdmac->ld_active)) {
 436                 spin_unlock_irqrestore(&imxdma->lock, flags);
 437                 goto out;
 438         }
 439
 440         desc = list_first_entry(&imxdmac->ld_active,
 441                                 struct imxdma_desc,
 442                                 node);
 443         spin_unlock_irqrestore(&imxdma->lock, flags);
 444
 445         if (desc->sg) {
 446                 u32 tmp;
 447                 desc->sg = sg_next(desc->sg);
 448
 449                 if (desc->sg) {
 450                         imxdma_sg_next(desc);
 451
 452                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
 453
 454                         if (imxdma_hw_chain(imxdmac)) {
 455                                 /* FIXME: The timeout should probably be
 456                                  * configurable
 457                                  */
 458                                 mod_timer(&imxdmac->watchdog,
 459                                         jiffies + msecs_to_jiffies(500));
 460
 461                                 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
 462                                 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 463                         } else {
 464                                 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
 465                                                  DMA_CCR(chno));
 466                                 tmp |= CCR_CEN;
 467                         }
 468
 469                         imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 470
 471                         if (imxdma_chan_is_doing_cyclic(imxdmac))
 472                                 /* Tasklet progression */
 473                                 tasklet_schedule(&imxdmac->dma_tasklet);
 474
 475                         return;
 476                 }
 477
 478                 if (imxdma_hw_chain(imxdmac)) {
 479                         del_timer(&imxdmac->watchdog);
 480                         return;
 481                 }
 482         }
 483
 484 out:
 485         imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
 486         /* Tasklet irq */
 487         tasklet_schedule(&imxdmac->dma_tasklet);
 488 }
 489
 490 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 491 {
 492         struct imxdma_engine *imxdma = dev_id;
 493         int i, disr;
 494
 495         if (!is_imx1_dma(imxdma))
 496                 imxdma_err_handler(irq, dev_id);
 497
 498         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 499
 500         dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
 501
 502         imx_dmav1_writel(imxdma, disr, DMA_DISR);
 503         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 504                 if (disr & (1 << i))
 505                         dma_irq_handle_channel(&imxdma->channel[i]);
 506         }
 507
 508         return IRQ_HANDLED;
 509 }
 510
 511 static int imxdma_xfer_desc(struct imxdma_desc *d)
 512 {
 513         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 514         struct imxdma_engine *imxdma = imxdmac->imxdma;
 515         int slot = -1;
 516         int i;
 517
 518         /* Configure and enable */
 519         switch (d->type) {
 520         case IMXDMA_DESC_INTERLEAVED:
 521                 /* Try to get a free 2D slot */
 522                 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
 523                         if ((imxdma->slots_2d[i].count > 0) &&
 524                         ((imxdma->slots_2d[i].xsr != d->x) ||
 525                         (imxdma->slots_2d[i].ysr != d->y) ||
 526                         (imxdma->slots_2d[i].wsr != d->w)))
 527                                 continue;
 528                         slot = i;
 529                         break;
 530                 }
 531                 if (slot < 0)
 532                         return -EBUSY;
 533
 534                 imxdma->slots_2d[slot].xsr = d->x;
 535                 imxdma->slots_2d[slot].ysr = d->y;
 536                 imxdma->slots_2d[slot].wsr = d->w;
 537                 imxdma->slots_2d[slot].count++;
 538
 539                 imxdmac->slot_2d = slot;
 540                 imxdmac->enabled_2d = true;
 541
 542                 if (slot == IMX_DMA_2D_SLOT_A) {
 543                         d->config_mem &= ~CCR_MSEL_B;
 544                         d->config_port &= ~CCR_MSEL_B;
 545                         imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
 546                         imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
 547                         imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
 548                 } else {
 549                         d->config_mem |= CCR_MSEL_B;
 550                         d->config_port |= CCR_MSEL_B;
 551                         imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
 552                         imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
 553                         imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
 554                 }
 555                 /*
 556                  * We fall-through here intentionally, since a 2D transfer is
 557                  * similar to MEMCPY just adding the 2D slot configuration.
 558                  */
 559         case IMXDMA_DESC_MEMCPY:
 560                 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
 561                 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
 562                 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
 563                          DMA_CCR(imxdmac->channel));
 564
 565                 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
 566
 567                 dev_dbg(imxdma->dev,
 568                         "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
 569                         __func__, imxdmac->channel,
 570                         (unsigned long long)d->dest,
 571                         (unsigned long long)d->src, d->len);
 572
 573                 break;
 574         /* Cyclic transfer is the same as slave_sg with special sg configuration. */
 575         case IMXDMA_DESC_CYCLIC:
 576         case IMXDMA_DESC_SLAVE_SG:
 577                 if (d->direction == DMA_DEV_TO_MEM) {
 578                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 579                                          DMA_SAR(imxdmac->channel));
 580                         imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
 581                                          DMA_CCR(imxdmac->channel));
 582
 583                         dev_dbg(imxdma->dev,
 584                                 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
 585                                 __func__, imxdmac->channel,
 586                                 d->sg, d->sgcount, d->len,
 587                                 (unsigned long long)imxdmac->per_address);
 588                 } else if (d->direction == DMA_MEM_TO_DEV) {
 589                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 590                                          DMA_DAR(imxdmac->channel));
 591                         imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
 592                                          DMA_CCR(imxdmac->channel));
 593
 594                         dev_dbg(imxdma->dev,
 595                                 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
 596                                 __func__, imxdmac->channel,
 597                                 d->sg, d->sgcount, d->len,
 598                                 (unsigned long long)imxdmac->per_address);
 599                 } else {
 600                         dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
 601                                 __func__, imxdmac->channel);
 602                         return -EINVAL;
 603                 }
 604
 605                 imxdma_sg_next(d);
 606
 607                 break;
 608         default:
 609                 return -EINVAL;
 610         }
 611         imxdma_enable_hw(d);
 612         return 0;
 613 }
 614
 615 static void imxdma_tasklet(unsigned long data)
 616 {
 617         struct imxdma_channel *imxdmac = (void *)data;
 618         struct imxdma_engine *imxdma = imxdmac->imxdma;
 619         struct imxdma_desc *desc, *next_desc;
 620         unsigned long flags;
 621
 622         spin_lock_irqsave(&imxdma->lock, flags);
 623
 624         if (list_empty(&imxdmac->ld_active)) {
 625                 /* Someone might have called terminate all */
 626                 spin_unlock_irqrestore(&imxdma->lock, flags);
 627                 return;
 628         }
 629         desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
 630
 631         /* If we are dealing with a cyclic descriptor, keep it on ld_active
 632          * and dont mark the descriptor as complete.
 633          * Only in non-cyclic cases it would be marked as complete
 634          */
 635         if (imxdma_chan_is_doing_cyclic(imxdmac))
 636                 goto out;
 637         else
 638                 dma_cookie_complete(&desc->desc);
 639
 640         /* Free 2D slot if it was an interleaved transfer */
 641         if (imxdmac->enabled_2d) {
 642                 imxdma->slots_2d[imxdmac->slot_2d].count--;
 643                 imxdmac->enabled_2d = false;
 644         }
 645
 646         list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
 647
 648         if (!list_empty(&imxdmac->ld_queue)) {
 649                 next_desc = list_first_entry(&imxdmac->ld_queue,
 650                                              struct imxdma_desc, node);
 651                 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
 652                 if (imxdma_xfer_desc(next_desc) < 0)
 653                         dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
 654                                  __func__, imxdmac->channel);
 655         }
 656 out:
 657         spin_unlock_irqrestore(&imxdma->lock, flags);
 658
 659         dmaengine_desc_get_callback_invoke(&desc->desc, NULL);
 660 }
 661
 662 static int imxdma_terminate_all(struct dma_chan *chan)
 663 {
 664         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 665         struct imxdma_engine *imxdma = imxdmac->imxdma;
 666         unsigned long flags;
 667
 668         imxdma_disable_hw(imxdmac);
 669
 670         spin_lock_irqsave(&imxdma->lock, flags);
 671         list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 672         list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 673         spin_unlock_irqrestore(&imxdma->lock, flags);
 674         return 0;
 675 }
 676
 677 static int imxdma_config_write(struct dma_chan *chan,
 678                                struct dma_slave_config *dmaengine_cfg,
 679                                enum dma_transfer_direction direction)
 680 {
 681         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 682         struct imxdma_engine *imxdma = imxdmac->imxdma;
 683         unsigned int mode = 0;
 684
 685         if (direction == DMA_DEV_TO_MEM) {
 686                 imxdmac->per_address = dmaengine_cfg->src_addr;
 687                 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
 688                 imxdmac->word_size = dmaengine_cfg->src_addr_width;
 689         } else {
 690                 imxdmac->per_address = dmaengine_cfg->dst_addr;
 691                 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
 692                 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
 693         }
 694
 695         switch (imxdmac->word_size) {
 696         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 697                 mode = IMX_DMA_MEMSIZE_8;
 698                 break;
 699         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 700                 mode = IMX_DMA_MEMSIZE_16;
 701                 break;
 702         default:
 703         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 704                 mode = IMX_DMA_MEMSIZE_32;
 705                 break;
 706         }
 707
 708         imxdmac->hw_chaining = 0;
 709
 710         imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
 711                 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
 712                 CCR_REN;
 713         imxdmac->ccr_to_device =
 714                 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
 715                 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
 716         imx_dmav1_writel(imxdma, imxdmac->dma_request,
 717                          DMA_RSSR(imxdmac->channel));
 718
 719         /* Set burst length */
 720         imx_dmav1_writel(imxdma, imxdmac->watermark_level *
 721                          imxdmac->word_size, DMA_BLR(imxdmac->channel));
 722
 723         return 0;
 724 }
 725
 726 static int imxdma_config(struct dma_chan *chan,
 727                          struct dma_slave_config *dmaengine_cfg)
 728 {
 729         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 730
 731         memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
 732
 733         return 0;
 734 }
 735
 736 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
 737                                             dma_cookie_t cookie,
 738                                             struct dma_tx_state *txstate)
 739 {
 740         return dma_cookie_status(chan, cookie, txstate);
 741 }
 742
 743 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
 744 {
 745         struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
 746         struct imxdma_engine *imxdma = imxdmac->imxdma;
 747         dma_cookie_t cookie;
 748         unsigned long flags;
 749
 750         spin_lock_irqsave(&imxdma->lock, flags);
 751         list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
 752         cookie = dma_cookie_assign(tx);
 753         spin_unlock_irqrestore(&imxdma->lock, flags);
 754
 755         return cookie;
 756 }
 757
 758 static int imxdma_alloc_chan_resources(struct dma_chan *chan)
 759 {
 760         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 761         struct imx_dma_data *data = chan->private;
 762
 763         if (data != NULL)
 764                 imxdmac->dma_request = data->dma_request;
 765
 766         while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
 767                 struct imxdma_desc *desc;
 768
 769                 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 770                 if (!desc)
 771                         break;
 772                 memset(&desc->desc, 0, sizeof(struct dma_async_tx_descriptor));
 773                 dma_async_tx_descriptor_init(&desc->desc, chan);
 774                 desc->desc.tx_submit = imxdma_tx_submit;
 775                 /* txd.flags will be overwritten in prep funcs */
 776                 desc->desc.flags = DMA_CTRL_ACK;
 777                 desc->status = DMA_COMPLETE;
 778
 779                 list_add_tail(&desc->node, &imxdmac->ld_free);
 780                 imxdmac->descs_allocated++;
 781         }
 782
 783         if (!imxdmac->descs_allocated)
 784                 return -ENOMEM;
 785
 786         return imxdmac->descs_allocated;
 787 }
 788
 789 static void imxdma_free_chan_resources(struct dma_chan *chan)
 790 {
 791         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 792         struct imxdma_engine *imxdma = imxdmac->imxdma;
 793         struct imxdma_desc *desc, *_desc;
 794         unsigned long flags;
 795
 796         spin_lock_irqsave(&imxdma->lock, flags);
 797
 798         imxdma_disable_hw(imxdmac);
 799         list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 800         list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 801
 802         spin_unlock_irqrestore(&imxdma->lock, flags);
 803
 804         list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
 805                 kfree(desc);
 806                 imxdmac->descs_allocated--;
 807         }
 808         INIT_LIST_HEAD(&imxdmac->ld_free);
 809
 810         kfree(imxdmac->sg_list);
 811         imxdmac->sg_list = NULL;
 812 }
 813
 814 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
 815                 struct dma_chan *chan, struct scatterlist *sgl,
 816                 unsigned int sg_len, enum dma_transfer_direction direction,
 817                 unsigned long flags, void *context)
 818 {
 819         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 820         struct scatterlist *sg;
 821         int i, dma_length = 0;
 822         struct imxdma_desc *desc;
 823
 824         if (list_empty(&imxdmac->ld_free) ||
 825             imxdma_chan_is_doing_cyclic(imxdmac))
 826                 return NULL;
 827
 828         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 829
 830         for_each_sg(sgl, sg, sg_len, i) {
 831                 dma_length += sg_dma_len(sg);
 832         }
 833
 834         switch (imxdmac->word_size) {
 835         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 836                 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
 837                         return NULL;
 838                 break;
 839         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 840                 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
 841                         return NULL;
 842                 break;
 843         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 844                 break;
 845         default:
 846                 return NULL;
 847         }
 848
 849         desc->type = IMXDMA_DESC_SLAVE_SG;
 850         desc->sg = sgl;
 851         desc->sgcount = sg_len;
 852         desc->len = dma_length;
 853         desc->direction = direction;
 854         if (direction == DMA_DEV_TO_MEM) {
 855                 desc->src = imxdmac->per_address;
 856         } else {
 857                 desc->dest = imxdmac->per_address;
 858         }
 859         desc->desc.callback = NULL;
 860         desc->desc.callback_param = NULL;
 861
 862         return &desc->desc;
 863 }
 864
 865 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
 866                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 867                 size_t period_len, enum dma_transfer_direction direction,
 868                 unsigned long flags)
 869 {
 870         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 871         struct imxdma_engine *imxdma = imxdmac->imxdma;
 872         struct imxdma_desc *desc;
 873         int i;
 874         unsigned int periods = buf_len / period_len;
 875
 876         dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
 877                         __func__, imxdmac->channel, buf_len, period_len);
 878
 879         if (list_empty(&imxdmac->ld_free) ||
 880             imxdma_chan_is_doing_cyclic(imxdmac))
 881                 return NULL;
 882
 883         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 884
 885         kfree(imxdmac->sg_list);
 886
 887         imxdmac->sg_list = kcalloc(periods + 1,
 888                         sizeof(struct scatterlist), GFP_ATOMIC);
 889         if (!imxdmac->sg_list)
 890                 return NULL;
 891
 892         sg_init_table(imxdmac->sg_list, periods);
 893
 894         for (i = 0; i < periods; i++) {
 895                 sg_assign_page(&imxdmac->sg_list[i], NULL);
 896                 imxdmac->sg_list[i].offset = 0;
 897                 imxdmac->sg_list[i].dma_address = dma_addr;
 898                 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
 899                 dma_addr += period_len;
 900         }
 901
 902         /* close the loop */
 903         sg_chain(imxdmac->sg_list, periods + 1, imxdmac->sg_list);
 904
 905         desc->type = IMXDMA_DESC_CYCLIC;
 906         desc->sg = imxdmac->sg_list;
 907         desc->sgcount = periods;
 908         desc->len = IMX_DMA_LENGTH_LOOP;
 909         desc->direction = direction;
 910         if (direction == DMA_DEV_TO_MEM) {
 911                 desc->src = imxdmac->per_address;
 912         } else {
 913                 desc->dest = imxdmac->per_address;
 914         }
 915         desc->desc.callback = NULL;
 916         desc->desc.callback_param = NULL;
 917
 918         imxdma_config_write(chan, &imxdmac->config, direction);
 919
 920         return &desc->desc;
 921 }
 922
 923 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
 924         struct dma_chan *chan, dma_addr_t dest,
 925         dma_addr_t src, size_t len, unsigned long flags)
 926 {
 927         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 928         struct imxdma_engine *imxdma = imxdmac->imxdma;
 929         struct imxdma_desc *desc;
 930
 931         dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
 932                 __func__, imxdmac->channel, (unsigned long long)src,
 933                 (unsigned long long)dest, len);
 934
 935         if (list_empty(&imxdmac->ld_free) ||
 936             imxdma_chan_is_doing_cyclic(imxdmac))
 937                 return NULL;
 938
 939         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 940
 941         desc->type = IMXDMA_DESC_MEMCPY;
 942         desc->src = src;
 943         desc->dest = dest;
 944         desc->len = len;
 945         desc->direction = DMA_MEM_TO_MEM;
 946         desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 947         desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 948         desc->desc.callback = NULL;
 949         desc->desc.callback_param = NULL;
 950
 951         return &desc->desc;
 952 }
 953
 954 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
 955         struct dma_chan *chan, struct dma_interleaved_template *xt,
 956         unsigned long flags)
 957 {
 958         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 959         struct imxdma_engine *imxdma = imxdmac->imxdma;
 960         struct imxdma_desc *desc;
 961
 962         dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
 963                 "   src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
 964                 imxdmac->channel, (unsigned long long)xt->src_start,
 965                 (unsigned long long) xt->dst_start,
 966                 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
 967                 xt->numf, xt->frame_size);
 968
 969         if (list_empty(&imxdmac->ld_free) ||
 970             imxdma_chan_is_doing_cyclic(imxdmac))
 971                 return NULL;
 972
 973         if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
 974                 return NULL;
 975
 976         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 977
 978         desc->type = IMXDMA_DESC_INTERLEAVED;
 979         desc->src = xt->src_start;
 980         desc->dest = xt->dst_start;
 981         desc->x = xt->sgl[0].size;
 982         desc->y = xt->numf;
 983         desc->w = xt->sgl[0].icg + desc->x;
 984         desc->len = desc->x * desc->y;
 985         desc->direction = DMA_MEM_TO_MEM;
 986         desc->config_port = IMX_DMA_MEMSIZE_32;
 987         desc->config_mem = IMX_DMA_MEMSIZE_32;
 988         if (xt->src_sgl)
 989                 desc->config_mem |= IMX_DMA_TYPE_2D;
 990         if (xt->dst_sgl)
 991                 desc->config_port |= IMX_DMA_TYPE_2D;
 992         desc->desc.callback = NULL;
 993         desc->desc.callback_param = NULL;
 994
 995         return &desc->desc;
 996 }
 997
 998 static void imxdma_issue_pending(struct dma_chan *chan)
 999 {
1000         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
1001         struct imxdma_engine *imxdma = imxdmac->imxdma;
1002         struct imxdma_desc *desc;
1003         unsigned long flags;
1004
1005         spin_lock_irqsave(&imxdma->lock, flags);
1006         if (list_empty(&imxdmac->ld_active) &&
1007             !list_empty(&imxdmac->ld_queue)) {
1008                 desc = list_first_entry(&imxdmac->ld_queue,
1009                                         struct imxdma_desc, node);
1010
1011                 if (imxdma_xfer_desc(desc) < 0) {
1012                         dev_warn(imxdma->dev,
1013                                  "%s: channel: %d couldn't issue DMA xfer\n",
1014                                  __func__, imxdmac->channel);
1015                 } else {
1016                         list_move_tail(imxdmac->ld_queue.next,
1017                                        &imxdmac->ld_active);
1018                 }
1019         }
1020         spin_unlock_irqrestore(&imxdma->lock, flags);
1021 }
1022
1023 static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
1024 {
1025         struct imxdma_filter_data *fdata = param;
1026         struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
1027
1028         if (chan->device->dev != fdata->imxdma->dev)
1029                 return false;
1030
1031         imxdma_chan->dma_request = fdata->request;
1032         chan->private = NULL;
1033
1034         return true;
1035 }
1036
1037 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
1038                                                 struct of_dma *ofdma)
1039 {
1040         int count = dma_spec->args_count;
1041         struct imxdma_engine *imxdma = ofdma->of_dma_data;
1042         struct imxdma_filter_data fdata = {
1043                 .imxdma = imxdma,
1044         };
1045
1046         if (count != 1)
1047                 return NULL;
1048
1049         fdata.request = dma_spec->args[0];
1050
1051         return dma_request_channel(imxdma->dma_device.cap_mask,
1052                                         imxdma_filter_fn, &fdata);
1053 }
1054
1055 static int __init imxdma_probe(struct platform_device *pdev)
1056 {
1057         struct imxdma_engine *imxdma;
1058         struct resource *res;
1059         const struct of_device_id *of_id;
1060         int ret, i;
1061         int irq, irq_err;
1062
1063         of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev);
1064         if (of_id)
1065                 pdev->id_entry = of_id->data;
1066
1067         imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1068         if (!imxdma)
1069                 return -ENOMEM;
1070
1071         imxdma->dev = &pdev->dev;
1072         imxdma->devtype = pdev->id_entry->driver_data;
1073
1074         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1075         imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1076         if (IS_ERR(imxdma->base))
1077                 return PTR_ERR(imxdma->base);
1078
1079         irq = platform_get_irq(pdev, 0);
1080         if (irq < 0)
1081                 return irq;
1082
1083         imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1084         if (IS_ERR(imxdma->dma_ipg))
1085                 return PTR_ERR(imxdma->dma_ipg);
1086
1087         imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1088         if (IS_ERR(imxdma->dma_ahb))
1089                 return PTR_ERR(imxdma->dma_ahb);
1090
1091         ret = clk_prepare_enable(imxdma->dma_ipg);
1092         if (ret)
1093                 return ret;
1094         ret = clk_prepare_enable(imxdma->dma_ahb);
1095         if (ret)
1096                 goto disable_dma_ipg_clk;
1097
1098         /* reset DMA module */
1099         imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1100
1101         if (is_imx1_dma(imxdma)) {
1102                 ret = devm_request_irq(&pdev->dev, irq,
1103                                        dma_irq_handler, 0, "DMA", imxdma);
1104                 if (ret) {
1105                         dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1106                         goto disable_dma_ahb_clk;
1107                 }
1108                 imxdma->irq = irq;
1109
1110                 irq_err = platform_get_irq(pdev, 1);
1111                 if (irq_err < 0) {
1112                         ret = irq_err;
1113                         goto disable_dma_ahb_clk;
1114                 }
1115
1116                 ret = devm_request_irq(&pdev->dev, irq_err,
1117                                        imxdma_err_handler, 0, "DMA", imxdma);
1118                 if (ret) {
1119                         dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1120                         goto disable_dma_ahb_clk;
1121                 }
1122                 imxdma->irq_err = irq_err;
1123         }
1124
1125         /* enable DMA module */
1126         imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1127
1128         /* clear all interrupts */
1129         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1130
1131         /* disable interrupts */
1132         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1133
1134         INIT_LIST_HEAD(&imxdma->dma_device.channels);
1135
1136         dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1137         dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1138         dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1139         dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1140
1141         /* Initialize 2D global parameters */
1142         for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1143                 imxdma->slots_2d[i].count = 0;
1144
1145         spin_lock_init(&imxdma->lock);
1146
1147         /* Initialize channel parameters */
1148         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1149                 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1150
1151                 if (!is_imx1_dma(imxdma)) {
1152                         ret = devm_request_irq(&pdev->dev, irq + i,
1153                                         dma_irq_handler, 0, "DMA", imxdma);
1154                         if (ret) {
1155                                 dev_warn(imxdma->dev, "Can't register IRQ %d "
1156                                          "for DMA channel %d\n",
1157                                          irq + i, i);
1158                                 goto disable_dma_ahb_clk;
1159                         }
1160
1161                         imxdmac->irq = irq + i;
1162                         timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
1163                 }
1164
1165                 imxdmac->imxdma = imxdma;
1166
1167                 INIT_LIST_HEAD(&imxdmac->ld_queue);
1168                 INIT_LIST_HEAD(&imxdmac->ld_free);
1169                 INIT_LIST_HEAD(&imxdmac->ld_active);
1170
1171                 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1172                              (unsigned long)imxdmac);
1173                 imxdmac->chan.device = &imxdma->dma_device;
1174                 dma_cookie_init(&imxdmac->chan);
1175                 imxdmac->channel = i;
1176
1177                 /* Add the channel to the DMAC list */
1178                 list_add_tail(&imxdmac->chan.device_node,
1179                               &imxdma->dma_device.channels);
1180         }
1181
1182         imxdma->dma_device.dev = &pdev->dev;
1183
1184         imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1185         imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1186         imxdma->dma_device.device_tx_status = imxdma_tx_status;
1187         imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1188         imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1189         imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1190         imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1191         imxdma->dma_device.device_config = imxdma_config;
1192         imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
1193         imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1194
1195         platform_set_drvdata(pdev, imxdma);
1196
1197         imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
1198         imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1199         dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1200
1201         ret = dma_async_device_register(&imxdma->dma_device);
1202         if (ret) {
1203                 dev_err(&pdev->dev, "unable to register\n");
1204                 goto disable_dma_ahb_clk;
1205         }
1206
1207         if (pdev->dev.of_node) {
1208                 ret = of_dma_controller_register(pdev->dev.of_node,
1209                                 imxdma_xlate, imxdma);
1210                 if (ret) {
1211                         dev_err(&pdev->dev, "unable to register of_dma_controller\n");
1212                         goto err_of_dma_controller;
1213                 }
1214         }
1215
1216         return 0;
1217
1218 err_of_dma_controller:
1219         dma_async_device_unregister(&imxdma->dma_device);
1220 disable_dma_ahb_clk:
1221         clk_disable_unprepare(imxdma->dma_ahb);
1222 disable_dma_ipg_clk:
1223         clk_disable_unprepare(imxdma->dma_ipg);
1224         return ret;
1225 }
1226
1227 static void imxdma_free_irq(struct platform_device *pdev, struct imxdma_engine *imxdma)
1228 {
1229         int i;
1230
1231         if (is_imx1_dma(imxdma)) {
1232                 disable_irq(imxdma->irq);
1233                 disable_irq(imxdma->irq_err);
1234         }
1235
1236         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1237                 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1238
1239                 if (!is_imx1_dma(imxdma))
1240                         disable_irq(imxdmac->irq);
1241
1242                 tasklet_kill(&imxdmac->dma_tasklet);
1243         }
1244 }
1245
1246 static int imxdma_remove(struct platform_device *pdev)
1247 {
1248         struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1249
1250         imxdma_free_irq(pdev, imxdma);
1251
1252         dma_async_device_unregister(&imxdma->dma_device);
1253
1254         if (pdev->dev.of_node)
1255                 of_dma_controller_free(pdev->dev.of_node);
1256
1257         clk_disable_unprepare(imxdma->dma_ipg);
1258         clk_disable_unprepare(imxdma->dma_ahb);
1259
1260         return 0;
1261 }
1262
1263 static struct platform_driver imxdma_driver = {
1264         .driver         = {
1265                 .name   = "imx-dma",
1266                 .of_match_table = imx_dma_of_dev_id,
1267         },
1268         .id_table       = imx_dma_devtype,
1269         .remove         = imxdma_remove,
1270 };
1271
1272 static int __init imxdma_module_init(void)
1273 {
1274         return platform_driver_probe(&imxdma_driver, imxdma_probe);
1275 }
1276 subsys_initcall(imxdma_module_init);
1277
1278 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1279 MODULE_DESCRIPTION("i.MX dma driver");
1280 MODULE_LICENSE("GPL");