drivers/dma/imx-dma.c

   1 /*
   2  * drivers/dma/imx-dma.c
   3  *
   4  * This file contains a driver for the Freescale i.MX DMA engine
   5  * found on i.MX1/21/27
   6  *
   7  * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
   8  * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
   9  *
  10  * The code contained herein is licensed under the GNU General Public
  11  * License. You may obtain a copy of the GNU General Public License
  12  * Version 2 or later at the following locations:
  13  *
  14  * http://www.opensource.org/licenses/gpl-license.html
  15  * http://www.gnu.org/copyleft/gpl.html
  16  */
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/types.h>
  20 #include <linux/mm.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/device.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/slab.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/clk.h>
  28 #include <linux/dmaengine.h>
  29 #include <linux/module.h>
  30
  31 #include <asm/irq.h>
  32 #include <linux/platform_data/dma-imx.h>
  33
  34 #include "dmaengine.h"
  35 #define IMXDMA_MAX_CHAN_DESCRIPTORS     16
  36 #define IMX_DMA_CHANNELS  16
  37
  38 #define IMX_DMA_2D_SLOTS        2
  39 #define IMX_DMA_2D_SLOT_A       0
  40 #define IMX_DMA_2D_SLOT_B       1
  41
  42 #define IMX_DMA_LENGTH_LOOP     ((unsigned int)-1)
  43 #define IMX_DMA_MEMSIZE_32      (0 << 4)
  44 #define IMX_DMA_MEMSIZE_8       (1 << 4)
  45 #define IMX_DMA_MEMSIZE_16      (2 << 4)
  46 #define IMX_DMA_TYPE_LINEAR     (0 << 10)
  47 #define IMX_DMA_TYPE_2D         (1 << 10)
  48 #define IMX_DMA_TYPE_FIFO       (2 << 10)
  49
  50 #define IMX_DMA_ERR_BURST     (1 << 0)
  51 #define IMX_DMA_ERR_REQUEST   (1 << 1)
  52 #define IMX_DMA_ERR_TRANSFER  (1 << 2)
  53 #define IMX_DMA_ERR_BUFFER    (1 << 3)
  54 #define IMX_DMA_ERR_TIMEOUT   (1 << 4)
  55
  56 #define DMA_DCR     0x00                /* Control Register */
  57 #define DMA_DISR    0x04                /* Interrupt status Register */
  58 #define DMA_DIMR    0x08                /* Interrupt mask Register */
  59 #define DMA_DBTOSR  0x0c                /* Burst timeout status Register */
  60 #define DMA_DRTOSR  0x10                /* Request timeout Register */
  61 #define DMA_DSESR   0x14                /* Transfer Error Status Register */
  62 #define DMA_DBOSR   0x18                /* Buffer overflow status Register */
  63 #define DMA_DBTOCR  0x1c                /* Burst timeout control Register */
  64 #define DMA_WSRA    0x40                /* W-Size Register A */
  65 #define DMA_XSRA    0x44                /* X-Size Register A */
  66 #define DMA_YSRA    0x48                /* Y-Size Register A */
  67 #define DMA_WSRB    0x4c                /* W-Size Register B */
  68 #define DMA_XSRB    0x50                /* X-Size Register B */
  69 #define DMA_YSRB    0x54                /* Y-Size Register B */
  70 #define DMA_SAR(x)  (0x80 + ((x) << 6)) /* Source Address Registers */
  71 #define DMA_DAR(x)  (0x84 + ((x) << 6)) /* Destination Address Registers */
  72 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
  73 #define DMA_CCR(x)  (0x8c + ((x) << 6)) /* Control Registers */
  74 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
  75 #define DMA_BLR(x)  (0x94 + ((x) << 6)) /* Burst length Registers */
  76 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
  77 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
  78 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
  79
  80 #define DCR_DRST           (1<<1)
  81 #define DCR_DEN            (1<<0)
  82 #define DBTOCR_EN          (1<<15)
  83 #define DBTOCR_CNT(x)      ((x) & 0x7fff)
  84 #define CNTR_CNT(x)        ((x) & 0xffffff)
  85 #define CCR_ACRPT          (1<<14)
  86 #define CCR_DMOD_LINEAR    (0x0 << 12)
  87 #define CCR_DMOD_2D        (0x1 << 12)
  88 #define CCR_DMOD_FIFO      (0x2 << 12)
  89 #define CCR_DMOD_EOBFIFO   (0x3 << 12)
  90 #define CCR_SMOD_LINEAR    (0x0 << 10)
  91 #define CCR_SMOD_2D        (0x1 << 10)
  92 #define CCR_SMOD_FIFO      (0x2 << 10)
  93 #define CCR_SMOD_EOBFIFO   (0x3 << 10)
  94 #define CCR_MDIR_DEC       (1<<9)
  95 #define CCR_MSEL_B         (1<<8)
  96 #define CCR_DSIZ_32        (0x0 << 6)
  97 #define CCR_DSIZ_8         (0x1 << 6)
  98 #define CCR_DSIZ_16        (0x2 << 6)
  99 #define CCR_SSIZ_32        (0x0 << 4)
 100 #define CCR_SSIZ_8         (0x1 << 4)
 101 #define CCR_SSIZ_16        (0x2 << 4)
 102 #define CCR_REN            (1<<3)
 103 #define CCR_RPT            (1<<2)
 104 #define CCR_FRC            (1<<1)
 105 #define CCR_CEN            (1<<0)
 106 #define RTOR_EN            (1<<15)
 107 #define RTOR_CLK           (1<<14)
 108 #define RTOR_PSC           (1<<13)
 109
 110 enum  imxdma_prep_type {
 111         IMXDMA_DESC_MEMCPY,
 112         IMXDMA_DESC_INTERLEAVED,
 113         IMXDMA_DESC_SLAVE_SG,
 114         IMXDMA_DESC_CYCLIC,
 115 };
 116
 117 struct imx_dma_2d_config {
 118         u16             xsr;
 119         u16             ysr;
 120         u16             wsr;
 121         int             count;
 122 };
 123
 124 struct imxdma_desc {
 125         struct list_head                node;
 126         struct dma_async_tx_descriptor  desc;
 127         enum dma_status                 status;
 128         dma_addr_t                      src;
 129         dma_addr_t                      dest;
 130         size_t                          len;
 131         enum dma_transfer_direction     direction;
 132         enum imxdma_prep_type           type;
 133         /* For memcpy and interleaved */
 134         unsigned int                    config_port;
 135         unsigned int                    config_mem;
 136         /* For interleaved transfers */
 137         unsigned int                    x;
 138         unsigned int                    y;
 139         unsigned int                    w;
 140         /* For slave sg and cyclic */
 141         struct scatterlist              *sg;
 142         unsigned int                    sgcount;
 143 };
 144
 145 struct imxdma_channel {
 146         int                             hw_chaining;
 147         struct timer_list               watchdog;
 148         struct imxdma_engine            *imxdma;
 149         unsigned int                    channel;
 150
 151         struct tasklet_struct           dma_tasklet;
 152         struct list_head                ld_free;
 153         struct list_head                ld_queue;
 154         struct list_head                ld_active;
 155         int                             descs_allocated;
 156         enum dma_slave_buswidth         word_size;
 157         dma_addr_t                      per_address;
 158         u32                             watermark_level;
 159         struct dma_chan                 chan;
 160         struct dma_async_tx_descriptor  desc;
 161         enum dma_status                 status;
 162         int                             dma_request;
 163         struct scatterlist              *sg_list;
 164         u32                             ccr_from_device;
 165         u32                             ccr_to_device;
 166         bool                            enabled_2d;
 167         int                             slot_2d;
 168 };
 169
 170 enum imx_dma_type {
 171         IMX1_DMA,
 172         IMX21_DMA,
 173         IMX27_DMA,
 174 };
 175
 176 struct imxdma_engine {
 177         struct device                   *dev;
 178         struct device_dma_parameters    dma_parms;
 179         struct dma_device               dma_device;
 180         void __iomem                    *base;
 181         struct clk                      *dma_ahb;
 182         struct clk                      *dma_ipg;
 183         spinlock_t                      lock;
 184         struct imx_dma_2d_config        slots_2d[IMX_DMA_2D_SLOTS];
 185         struct imxdma_channel           channel[IMX_DMA_CHANNELS];
 186         enum imx_dma_type               devtype;
 187 };
 188
 189 static struct platform_device_id imx_dma_devtype[] = {
 190         {
 191                 .name = "imx1-dma",
 192                 .driver_data = IMX1_DMA,
 193         }, {
 194                 .name = "imx21-dma",
 195                 .driver_data = IMX21_DMA,
 196         }, {
 197                 .name = "imx27-dma",
 198                 .driver_data = IMX27_DMA,
 199         }, {
 200                 /* sentinel */
 201         }
 202 };
 203 MODULE_DEVICE_TABLE(platform, imx_dma_devtype);
 204
 205 static inline int is_imx1_dma(struct imxdma_engine *imxdma)
 206 {
 207         return imxdma->devtype == IMX1_DMA;
 208 }
 209
 210 static inline int is_imx21_dma(struct imxdma_engine *imxdma)
 211 {
 212         return imxdma->devtype == IMX21_DMA;
 213 }
 214
 215 static inline int is_imx27_dma(struct imxdma_engine *imxdma)
 216 {
 217         return imxdma->devtype == IMX27_DMA;
 218 }
 219
 220 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
 221 {
 222         return container_of(chan, struct imxdma_channel, chan);
 223 }
 224
 225 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
 226 {
 227         struct imxdma_desc *desc;
 228
 229         if (!list_empty(&imxdmac->ld_active)) {
 230                 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
 231                                         node);
 232                 if (desc->type == IMXDMA_DESC_CYCLIC)
 233                         return true;
 234         }
 235         return false;
 236 }
 237
 238
 239
 240 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
 241                              unsigned offset)
 242 {
 243         __raw_writel(val, imxdma->base + offset);
 244 }
 245
 246 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
 247 {
 248         return __raw_readl(imxdma->base + offset);
 249 }
 250
 251 static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
 252 {
 253         struct imxdma_engine *imxdma = imxdmac->imxdma;
 254
 255         if (is_imx27_dma(imxdma))
 256                 return imxdmac->hw_chaining;
 257         else
 258                 return 0;
 259 }
 260
 261 /*
 262  * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
 263  */
 264 static inline int imxdma_sg_next(struct imxdma_desc *d)
 265 {
 266         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 267         struct imxdma_engine *imxdma = imxdmac->imxdma;
 268         struct scatterlist *sg = d->sg;
 269         unsigned long now;
 270
 271         now = min(d->len, sg_dma_len(sg));
 272         if (d->len != IMX_DMA_LENGTH_LOOP)
 273                 d->len -= now;
 274
 275         if (d->direction == DMA_DEV_TO_MEM)
 276                 imx_dmav1_writel(imxdma, sg->dma_address,
 277                                  DMA_DAR(imxdmac->channel));
 278         else
 279                 imx_dmav1_writel(imxdma, sg->dma_address,
 280                                  DMA_SAR(imxdmac->channel));
 281
 282         imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
 283
 284         dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
 285                 "size 0x%08x\n", __func__, imxdmac->channel,
 286                  imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
 287                  imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
 288                  imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
 289
 290         return now;
 291 }
 292
 293 static void imxdma_enable_hw(struct imxdma_desc *d)
 294 {
 295         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 296         struct imxdma_engine *imxdma = imxdmac->imxdma;
 297         int channel = imxdmac->channel;
 298         unsigned long flags;
 299
 300         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 301
 302         local_irq_save(flags);
 303
 304         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 305         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
 306                          ~(1 << channel), DMA_DIMR);
 307         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
 308                          CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
 309
 310         if (!is_imx1_dma(imxdma) &&
 311                         d->sg && imxdma_hw_chain(imxdmac)) {
 312                 d->sg = sg_next(d->sg);
 313                 if (d->sg) {
 314                         u32 tmp;
 315                         imxdma_sg_next(d);
 316                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
 317                         imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
 318                                          DMA_CCR(channel));
 319                 }
 320         }
 321
 322         local_irq_restore(flags);
 323 }
 324
 325 static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
 326 {
 327         struct imxdma_engine *imxdma = imxdmac->imxdma;
 328         int channel = imxdmac->channel;
 329         unsigned long flags;
 330
 331         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 332
 333         if (imxdma_hw_chain(imxdmac))
 334                 del_timer(&imxdmac->watchdog);
 335
 336         local_irq_save(flags);
 337         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
 338                          (1 << channel), DMA_DIMR);
 339         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
 340                          ~CCR_CEN, DMA_CCR(channel));
 341         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 342         local_irq_restore(flags);
 343 }
 344
 345 static void imxdma_watchdog(unsigned long data)
 346 {
 347         struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
 348         struct imxdma_engine *imxdma = imxdmac->imxdma;
 349         int channel = imxdmac->channel;
 350
 351         imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
 352
 353         /* Tasklet watchdog error handler */
 354         tasklet_schedule(&imxdmac->dma_tasklet);
 355         dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
 356                 imxdmac->channel);
 357 }
 358
 359 static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
 360 {
 361         struct imxdma_engine *imxdma = dev_id;
 362         unsigned int err_mask;
 363         int i, disr;
 364         int errcode;
 365
 366         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 367
 368         err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
 369                    imx_dmav1_readl(imxdma, DMA_DRTOSR) |
 370                    imx_dmav1_readl(imxdma, DMA_DSESR)  |
 371                    imx_dmav1_readl(imxdma, DMA_DBOSR);
 372
 373         if (!err_mask)
 374                 return IRQ_HANDLED;
 375
 376         imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
 377
 378         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 379                 if (!(err_mask & (1 << i)))
 380                         continue;
 381                 errcode = 0;
 382
 383                 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
 384                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
 385                         errcode |= IMX_DMA_ERR_BURST;
 386                 }
 387                 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
 388                         imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
 389                         errcode |= IMX_DMA_ERR_REQUEST;
 390                 }
 391                 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
 392                         imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
 393                         errcode |= IMX_DMA_ERR_TRANSFER;
 394                 }
 395                 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
 396                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
 397                         errcode |= IMX_DMA_ERR_BUFFER;
 398                 }
 399                 /* Tasklet error handler */
 400                 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
 401
 402                 printk(KERN_WARNING
 403                        "DMA timeout on channel %d -%s%s%s%s\n", i,
 404                        errcode & IMX_DMA_ERR_BURST ?    " burst" : "",
 405                        errcode & IMX_DMA_ERR_REQUEST ?  " request" : "",
 406                        errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
 407                        errcode & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
 408         }
 409         return IRQ_HANDLED;
 410 }
 411
 412 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
 413 {
 414         struct imxdma_engine *imxdma = imxdmac->imxdma;
 415         int chno = imxdmac->channel;
 416         struct imxdma_desc *desc;
 417
 418         spin_lock(&imxdma->lock);
 419         if (list_empty(&imxdmac->ld_active)) {
 420                 spin_unlock(&imxdma->lock);
 421                 goto out;
 422         }
 423
 424         desc = list_first_entry(&imxdmac->ld_active,
 425                                 struct imxdma_desc,
 426                                 node);
 427         spin_unlock(&imxdma->lock);
 428
 429         if (desc->sg) {
 430                 u32 tmp;
 431                 desc->sg = sg_next(desc->sg);
 432
 433                 if (desc->sg) {
 434                         imxdma_sg_next(desc);
 435
 436                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
 437
 438                         if (imxdma_hw_chain(imxdmac)) {
 439                                 /* FIXME: The timeout should probably be
 440                                  * configurable
 441                                  */
 442                                 mod_timer(&imxdmac->watchdog,
 443                                         jiffies + msecs_to_jiffies(500));
 444
 445                                 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
 446                                 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 447                         } else {
 448                                 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
 449                                                  DMA_CCR(chno));
 450                                 tmp |= CCR_CEN;
 451                         }
 452
 453                         imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 454
 455                         if (imxdma_chan_is_doing_cyclic(imxdmac))
 456                                 /* Tasklet progression */
 457                                 tasklet_schedule(&imxdmac->dma_tasklet);
 458
 459                         return;
 460                 }
 461
 462                 if (imxdma_hw_chain(imxdmac)) {
 463                         del_timer(&imxdmac->watchdog);
 464                         return;
 465                 }
 466         }
 467
 468 out:
 469         imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
 470         /* Tasklet irq */
 471         tasklet_schedule(&imxdmac->dma_tasklet);
 472 }
 473
 474 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 475 {
 476         struct imxdma_engine *imxdma = dev_id;
 477         int i, disr;
 478
 479         if (!is_imx1_dma(imxdma))
 480                 imxdma_err_handler(irq, dev_id);
 481
 482         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 483
 484         dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
 485
 486         imx_dmav1_writel(imxdma, disr, DMA_DISR);
 487         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 488                 if (disr & (1 << i))
 489                         dma_irq_handle_channel(&imxdma->channel[i]);
 490         }
 491
 492         return IRQ_HANDLED;
 493 }
 494
 495 static int imxdma_xfer_desc(struct imxdma_desc *d)
 496 {
 497         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 498         struct imxdma_engine *imxdma = imxdmac->imxdma;
 499         unsigned long flags;
 500         int slot = -1;
 501         int i;
 502
 503         /* Configure and enable */
 504         switch (d->type) {
 505         case IMXDMA_DESC_INTERLEAVED:
 506                 /* Try to get a free 2D slot */
 507                 spin_lock_irqsave(&imxdma->lock, flags);
 508                 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
 509                         if ((imxdma->slots_2d[i].count > 0) &&
 510                         ((imxdma->slots_2d[i].xsr != d->x) ||
 511                         (imxdma->slots_2d[i].ysr != d->y) ||
 512                         (imxdma->slots_2d[i].wsr != d->w)))
 513                                 continue;
 514                         slot = i;
 515                         break;
 516                 }
 517                 if (slot < 0) {
 518                         spin_unlock_irqrestore(&imxdma->lock, flags);
 519                         return -EBUSY;
 520                 }
 521
 522                 imxdma->slots_2d[slot].xsr = d->x;
 523                 imxdma->slots_2d[slot].ysr = d->y;
 524                 imxdma->slots_2d[slot].wsr = d->w;
 525                 imxdma->slots_2d[slot].count++;
 526
 527                 imxdmac->slot_2d = slot;
 528                 imxdmac->enabled_2d = true;
 529                 spin_unlock_irqrestore(&imxdma->lock, flags);
 530
 531                 if (slot == IMX_DMA_2D_SLOT_A) {
 532                         d->config_mem &= ~CCR_MSEL_B;
 533                         d->config_port &= ~CCR_MSEL_B;
 534                         imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
 535                         imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
 536                         imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
 537                 } else {
 538                         d->config_mem |= CCR_MSEL_B;
 539                         d->config_port |= CCR_MSEL_B;
 540                         imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
 541                         imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
 542                         imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
 543                 }
 544                 /*
 545                  * We fall-through here intentionally, since a 2D transfer is
 546                  * similar to MEMCPY just adding the 2D slot configuration.
 547                  */
 548         case IMXDMA_DESC_MEMCPY:
 549                 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
 550                 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
 551                 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
 552                          DMA_CCR(imxdmac->channel));
 553
 554                 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
 555
 556                 dev_dbg(imxdma->dev, "%s channel: %d dest=0x%08x src=0x%08x "
 557                         "dma_length=%d\n", __func__, imxdmac->channel,
 558                         d->dest, d->src, d->len);
 559
 560                 break;
 561         /* Cyclic transfer is the same as slave_sg with special sg configuration. */
 562         case IMXDMA_DESC_CYCLIC:
 563         case IMXDMA_DESC_SLAVE_SG:
 564                 if (d->direction == DMA_DEV_TO_MEM) {
 565                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 566                                          DMA_SAR(imxdmac->channel));
 567                         imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
 568                                          DMA_CCR(imxdmac->channel));
 569
 570                         dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d "
 571                                 "total length=%d dev_addr=0x%08x (dev2mem)\n",
 572                                 __func__, imxdmac->channel, d->sg, d->sgcount,
 573                                 d->len, imxdmac->per_address);
 574                 } else if (d->direction == DMA_MEM_TO_DEV) {
 575                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 576                                          DMA_DAR(imxdmac->channel));
 577                         imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
 578                                          DMA_CCR(imxdmac->channel));
 579
 580                         dev_dbg(imxdma->dev, "%s channel: %d sg=%p sgcount=%d "
 581                                 "total length=%d dev_addr=0x%08x (mem2dev)\n",
 582                                 __func__, imxdmac->channel, d->sg, d->sgcount,
 583                                 d->len, imxdmac->per_address);
 584                 } else {
 585                         dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
 586                                 __func__, imxdmac->channel);
 587                         return -EINVAL;
 588                 }
 589
 590                 imxdma_sg_next(d);
 591
 592                 break;
 593         default:
 594                 return -EINVAL;
 595         }
 596         imxdma_enable_hw(d);
 597         return 0;
 598 }
 599
 600 static void imxdma_tasklet(unsigned long data)
 601 {
 602         struct imxdma_channel *imxdmac = (void *)data;
 603         struct imxdma_engine *imxdma = imxdmac->imxdma;
 604         struct imxdma_desc *desc;
 605
 606         spin_lock(&imxdma->lock);
 607
 608         if (list_empty(&imxdmac->ld_active)) {
 609                 /* Someone might have called terminate all */
 610                 goto out;
 611         }
 612         desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
 613
 614         if (desc->desc.callback)
 615                 desc->desc.callback(desc->desc.callback_param);
 616
 617         /* If we are dealing with a cyclic descriptor, keep it on ld_active
 618          * and dont mark the descriptor as complete.
 619          * Only in non-cyclic cases it would be marked as complete
 620          */
 621         if (imxdma_chan_is_doing_cyclic(imxdmac))
 622                 goto out;
 623         else
 624                 dma_cookie_complete(&desc->desc);
 625
 626         /* Free 2D slot if it was an interleaved transfer */
 627         if (imxdmac->enabled_2d) {
 628                 imxdma->slots_2d[imxdmac->slot_2d].count--;
 629                 imxdmac->enabled_2d = false;
 630         }
 631
 632         list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
 633
 634         if (!list_empty(&imxdmac->ld_queue)) {
 635                 desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc,
 636                                         node);
 637                 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
 638                 if (imxdma_xfer_desc(desc) < 0)
 639                         dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
 640                                  __func__, imxdmac->channel);
 641         }
 642 out:
 643         spin_unlock(&imxdma->lock);
 644 }
 645
 646 static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 647                 unsigned long arg)
 648 {
 649         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 650         struct dma_slave_config *dmaengine_cfg = (void *)arg;
 651         struct imxdma_engine *imxdma = imxdmac->imxdma;
 652         unsigned long flags;
 653         unsigned int mode = 0;
 654
 655         switch (cmd) {
 656         case DMA_TERMINATE_ALL:
 657                 imxdma_disable_hw(imxdmac);
 658
 659                 spin_lock_irqsave(&imxdma->lock, flags);
 660                 list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 661                 list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 662                 spin_unlock_irqrestore(&imxdma->lock, flags);
 663                 return 0;
 664         case DMA_SLAVE_CONFIG:
 665                 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
 666                         imxdmac->per_address = dmaengine_cfg->src_addr;
 667                         imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
 668                         imxdmac->word_size = dmaengine_cfg->src_addr_width;
 669                 } else {
 670                         imxdmac->per_address = dmaengine_cfg->dst_addr;
 671                         imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
 672                         imxdmac->word_size = dmaengine_cfg->dst_addr_width;
 673                 }
 674
 675                 switch (imxdmac->word_size) {
 676                 case DMA_SLAVE_BUSWIDTH_1_BYTE:
 677                         mode = IMX_DMA_MEMSIZE_8;
 678                         break;
 679                 case DMA_SLAVE_BUSWIDTH_2_BYTES:
 680                         mode = IMX_DMA_MEMSIZE_16;
 681                         break;
 682                 default:
 683                 case DMA_SLAVE_BUSWIDTH_4_BYTES:
 684                         mode = IMX_DMA_MEMSIZE_32;
 685                         break;
 686                 }
 687
 688                 imxdmac->hw_chaining = 0;
 689
 690                 imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
 691                         ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
 692                         CCR_REN;
 693                 imxdmac->ccr_to_device =
 694                         (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
 695                         ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
 696                 imx_dmav1_writel(imxdma, imxdmac->dma_request,
 697                                  DMA_RSSR(imxdmac->channel));
 698
 699                 /* Set burst length */
 700                 imx_dmav1_writel(imxdma, imxdmac->watermark_level *
 701                                 imxdmac->word_size, DMA_BLR(imxdmac->channel));
 702
 703                 return 0;
 704         default:
 705                 return -ENOSYS;
 706         }
 707
 708         return -EINVAL;
 709 }
 710
 711 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
 712                                             dma_cookie_t cookie,
 713                                             struct dma_tx_state *txstate)
 714 {
 715         return dma_cookie_status(chan, cookie, txstate);
 716 }
 717
 718 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
 719 {
 720         struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
 721         struct imxdma_engine *imxdma = imxdmac->imxdma;
 722         dma_cookie_t cookie;
 723         unsigned long flags;
 724
 725         spin_lock_irqsave(&imxdma->lock, flags);
 726         list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
 727         cookie = dma_cookie_assign(tx);
 728         spin_unlock_irqrestore(&imxdma->lock, flags);
 729
 730         return cookie;
 731 }
 732
 733 static int imxdma_alloc_chan_resources(struct dma_chan *chan)
 734 {
 735         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 736         struct imx_dma_data *data = chan->private;
 737
 738         if (data != NULL)
 739                 imxdmac->dma_request = data->dma_request;
 740
 741         while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
 742                 struct imxdma_desc *desc;
 743
 744                 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 745                 if (!desc)
 746                         break;
 747                 __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor));
 748                 dma_async_tx_descriptor_init(&desc->desc, chan);
 749                 desc->desc.tx_submit = imxdma_tx_submit;
 750                 /* txd.flags will be overwritten in prep funcs */
 751                 desc->desc.flags = DMA_CTRL_ACK;
 752                 desc->status = DMA_SUCCESS;
 753
 754                 list_add_tail(&desc->node, &imxdmac->ld_free);
 755                 imxdmac->descs_allocated++;
 756         }
 757
 758         if (!imxdmac->descs_allocated)
 759                 return -ENOMEM;
 760
 761         return imxdmac->descs_allocated;
 762 }
 763
 764 static void imxdma_free_chan_resources(struct dma_chan *chan)
 765 {
 766         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 767         struct imxdma_engine *imxdma = imxdmac->imxdma;
 768         struct imxdma_desc *desc, *_desc;
 769         unsigned long flags;
 770
 771         spin_lock_irqsave(&imxdma->lock, flags);
 772
 773         imxdma_disable_hw(imxdmac);
 774         list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 775         list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 776
 777         spin_unlock_irqrestore(&imxdma->lock, flags);
 778
 779         list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
 780                 kfree(desc);
 781                 imxdmac->descs_allocated--;
 782         }
 783         INIT_LIST_HEAD(&imxdmac->ld_free);
 784
 785         if (imxdmac->sg_list) {
 786                 kfree(imxdmac->sg_list);
 787                 imxdmac->sg_list = NULL;
 788         }
 789 }
 790
 791 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
 792                 struct dma_chan *chan, struct scatterlist *sgl,
 793                 unsigned int sg_len, enum dma_transfer_direction direction,
 794                 unsigned long flags, void *context)
 795 {
 796         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 797         struct scatterlist *sg;
 798         int i, dma_length = 0;
 799         struct imxdma_desc *desc;
 800
 801         if (list_empty(&imxdmac->ld_free) ||
 802             imxdma_chan_is_doing_cyclic(imxdmac))
 803                 return NULL;
 804
 805         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 806
 807         for_each_sg(sgl, sg, sg_len, i) {
 808                 dma_length += sg_dma_len(sg);
 809         }
 810
 811         switch (imxdmac->word_size) {
 812         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 813                 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
 814                         return NULL;
 815                 break;
 816         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 817                 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
 818                         return NULL;
 819                 break;
 820         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 821                 break;
 822         default:
 823                 return NULL;
 824         }
 825
 826         desc->type = IMXDMA_DESC_SLAVE_SG;
 827         desc->sg = sgl;
 828         desc->sgcount = sg_len;
 829         desc->len = dma_length;
 830         desc->direction = direction;
 831         if (direction == DMA_DEV_TO_MEM) {
 832                 desc->src = imxdmac->per_address;
 833         } else {
 834                 desc->dest = imxdmac->per_address;
 835         }
 836         desc->desc.callback = NULL;
 837         desc->desc.callback_param = NULL;
 838
 839         return &desc->desc;
 840 }
 841
 842 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
 843                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 844                 size_t period_len, enum dma_transfer_direction direction,
 845                 unsigned long flags, void *context)
 846 {
 847         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 848         struct imxdma_engine *imxdma = imxdmac->imxdma;
 849         struct imxdma_desc *desc;
 850         int i;
 851         unsigned int periods = buf_len / period_len;
 852
 853         dev_dbg(imxdma->dev, "%s channel: %d buf_len=%d period_len=%d\n",
 854                         __func__, imxdmac->channel, buf_len, period_len);
 855
 856         if (list_empty(&imxdmac->ld_free) ||
 857             imxdma_chan_is_doing_cyclic(imxdmac))
 858                 return NULL;
 859
 860         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 861
 862         kfree(imxdmac->sg_list);
 863
 864         imxdmac->sg_list = kcalloc(periods + 1,
 865                         sizeof(struct scatterlist), GFP_KERNEL);
 866         if (!imxdmac->sg_list)
 867                 return NULL;
 868
 869         sg_init_table(imxdmac->sg_list, periods);
 870
 871         for (i = 0; i < periods; i++) {
 872                 imxdmac->sg_list[i].page_link = 0;
 873                 imxdmac->sg_list[i].offset = 0;
 874                 imxdmac->sg_list[i].dma_address = dma_addr;
 875                 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
 876                 dma_addr += period_len;
 877         }
 878
 879         /* close the loop */
 880         imxdmac->sg_list[periods].offset = 0;
 881         sg_dma_len(&imxdmac->sg_list[periods]) = 0;
 882         imxdmac->sg_list[periods].page_link =
 883                 ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
 884
 885         desc->type = IMXDMA_DESC_CYCLIC;
 886         desc->sg = imxdmac->sg_list;
 887         desc->sgcount = periods;
 888         desc->len = IMX_DMA_LENGTH_LOOP;
 889         desc->direction = direction;
 890         if (direction == DMA_DEV_TO_MEM) {
 891                 desc->src = imxdmac->per_address;
 892         } else {
 893                 desc->dest = imxdmac->per_address;
 894         }
 895         desc->desc.callback = NULL;
 896         desc->desc.callback_param = NULL;
 897
 898         return &desc->desc;
 899 }
 900
 901 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
 902         struct dma_chan *chan, dma_addr_t dest,
 903         dma_addr_t src, size_t len, unsigned long flags)
 904 {
 905         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 906         struct imxdma_engine *imxdma = imxdmac->imxdma;
 907         struct imxdma_desc *desc;
 908
 909         dev_dbg(imxdma->dev, "%s channel: %d src=0x%x dst=0x%x len=%d\n",
 910                         __func__, imxdmac->channel, src, dest, len);
 911
 912         if (list_empty(&imxdmac->ld_free) ||
 913             imxdma_chan_is_doing_cyclic(imxdmac))
 914                 return NULL;
 915
 916         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 917
 918         desc->type = IMXDMA_DESC_MEMCPY;
 919         desc->src = src;
 920         desc->dest = dest;
 921         desc->len = len;
 922         desc->direction = DMA_MEM_TO_MEM;
 923         desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 924         desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 925         desc->desc.callback = NULL;
 926         desc->desc.callback_param = NULL;
 927
 928         return &desc->desc;
 929 }
 930
 931 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
 932         struct dma_chan *chan, struct dma_interleaved_template *xt,
 933         unsigned long flags)
 934 {
 935         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 936         struct imxdma_engine *imxdma = imxdmac->imxdma;
 937         struct imxdma_desc *desc;
 938
 939         dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%x dst_start=0x%x\n"
 940                 "   src_sgl=%s dst_sgl=%s numf=%d frame_size=%d\n", __func__,
 941                 imxdmac->channel, xt->src_start, xt->dst_start,
 942                 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
 943                 xt->numf, xt->frame_size);
 944
 945         if (list_empty(&imxdmac->ld_free) ||
 946             imxdma_chan_is_doing_cyclic(imxdmac))
 947                 return NULL;
 948
 949         if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
 950                 return NULL;
 951
 952         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 953
 954         desc->type = IMXDMA_DESC_INTERLEAVED;
 955         desc->src = xt->src_start;
 956         desc->dest = xt->dst_start;
 957         desc->x = xt->sgl[0].size;
 958         desc->y = xt->numf;
 959         desc->w = xt->sgl[0].icg + desc->x;
 960         desc->len = desc->x * desc->y;
 961         desc->direction = DMA_MEM_TO_MEM;
 962         desc->config_port = IMX_DMA_MEMSIZE_32;
 963         desc->config_mem = IMX_DMA_MEMSIZE_32;
 964         if (xt->src_sgl)
 965                 desc->config_mem |= IMX_DMA_TYPE_2D;
 966         if (xt->dst_sgl)
 967                 desc->config_port |= IMX_DMA_TYPE_2D;
 968         desc->desc.callback = NULL;
 969         desc->desc.callback_param = NULL;
 970
 971         return &desc->desc;
 972 }
 973
 974 static void imxdma_issue_pending(struct dma_chan *chan)
 975 {
 976         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 977         struct imxdma_engine *imxdma = imxdmac->imxdma;
 978         struct imxdma_desc *desc;
 979         unsigned long flags;
 980
 981         spin_lock_irqsave(&imxdma->lock, flags);
 982         if (list_empty(&imxdmac->ld_active) &&
 983             !list_empty(&imxdmac->ld_queue)) {
 984                 desc = list_first_entry(&imxdmac->ld_queue,
 985                                         struct imxdma_desc, node);
 986
 987                 if (imxdma_xfer_desc(desc) < 0) {
 988                         dev_warn(imxdma->dev,
 989                                  "%s: channel: %d couldn't issue DMA xfer\n",
 990                                  __func__, imxdmac->channel);
 991                 } else {
 992                         list_move_tail(imxdmac->ld_queue.next,
 993                                        &imxdmac->ld_active);
 994                 }
 995         }
 996         spin_unlock_irqrestore(&imxdma->lock, flags);
 997 }
 998
 999 static int __init imxdma_probe(struct platform_device *pdev)
1000         {
1001         struct imxdma_engine *imxdma;
1002         struct resource *res;
1003         int ret, i;
1004         int irq, irq_err;
1005
1006         imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1007         if (!imxdma)
1008                 return -ENOMEM;
1009
1010         imxdma->devtype = pdev->id_entry->driver_data;
1011
1012         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1013         imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1014         if (IS_ERR(imxdma->base))
1015                 return PTR_ERR(imxdma->base);
1016
1017         irq = platform_get_irq(pdev, 0);
1018         if (irq < 0)
1019                 return irq;
1020
1021         imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1022         if (IS_ERR(imxdma->dma_ipg))
1023                 return PTR_ERR(imxdma->dma_ipg);
1024
1025         imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1026         if (IS_ERR(imxdma->dma_ahb))
1027                 return PTR_ERR(imxdma->dma_ahb);
1028
1029         clk_prepare_enable(imxdma->dma_ipg);
1030         clk_prepare_enable(imxdma->dma_ahb);
1031
1032         /* reset DMA module */
1033         imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1034
1035         if (is_imx1_dma(imxdma)) {
1036                 ret = devm_request_irq(&pdev->dev, irq,
1037                                        dma_irq_handler, 0, "DMA", imxdma);
1038                 if (ret) {
1039                         dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1040                         goto err;
1041                 }
1042
1043                 irq_err = platform_get_irq(pdev, 1);
1044                 if (irq_err < 0) {
1045                         ret = irq_err;
1046                         goto err;
1047                 }
1048
1049                 ret = devm_request_irq(&pdev->dev, irq_err,
1050                                        imxdma_err_handler, 0, "DMA", imxdma);
1051                 if (ret) {
1052                         dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1053                         goto err;
1054                 }
1055         }
1056
1057         /* enable DMA module */
1058         imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1059
1060         /* clear all interrupts */
1061         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1062
1063         /* disable interrupts */
1064         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1065
1066         INIT_LIST_HEAD(&imxdma->dma_device.channels);
1067
1068         dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1069         dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1070         dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1071         dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1072
1073         /* Initialize 2D global parameters */
1074         for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1075                 imxdma->slots_2d[i].count = 0;
1076
1077         spin_lock_init(&imxdma->lock);
1078
1079         /* Initialize channel parameters */
1080         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1081                 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1082
1083                 if (!is_imx1_dma(imxdma)) {
1084                         ret = devm_request_irq(&pdev->dev, irq + i,
1085                                         dma_irq_handler, 0, "DMA", imxdma);
1086                         if (ret) {
1087                                 dev_warn(imxdma->dev, "Can't register IRQ %d "
1088                                          "for DMA channel %d\n",
1089                                          irq + i, i);
1090                                 goto err;
1091                         }
1092                         init_timer(&imxdmac->watchdog);
1093                         imxdmac->watchdog.function = &imxdma_watchdog;
1094                         imxdmac->watchdog.data = (unsigned long)imxdmac;
1095                 }
1096
1097                 imxdmac->imxdma = imxdma;
1098
1099                 INIT_LIST_HEAD(&imxdmac->ld_queue);
1100                 INIT_LIST_HEAD(&imxdmac->ld_free);
1101                 INIT_LIST_HEAD(&imxdmac->ld_active);
1102
1103                 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1104                              (unsigned long)imxdmac);
1105                 imxdmac->chan.device = &imxdma->dma_device;
1106                 dma_cookie_init(&imxdmac->chan);
1107                 imxdmac->channel = i;
1108
1109                 /* Add the channel to the DMAC list */
1110                 list_add_tail(&imxdmac->chan.device_node,
1111                               &imxdma->dma_device.channels);
1112         }
1113
1114         imxdma->dev = &pdev->dev;
1115         imxdma->dma_device.dev = &pdev->dev;
1116
1117         imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1118         imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1119         imxdma->dma_device.device_tx_status = imxdma_tx_status;
1120         imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1121         imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1122         imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1123         imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1124         imxdma->dma_device.device_control = imxdma_control;
1125         imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1126
1127         platform_set_drvdata(pdev, imxdma);
1128
1129         imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */
1130         imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1131         dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1132
1133         ret = dma_async_device_register(&imxdma->dma_device);
1134         if (ret) {
1135                 dev_err(&pdev->dev, "unable to register\n");
1136                 goto err;
1137         }
1138
1139         return 0;
1140
1141 err:
1142         clk_disable_unprepare(imxdma->dma_ipg);
1143         clk_disable_unprepare(imxdma->dma_ahb);
1144         return ret;
1145 }
1146
1147 static int imxdma_remove(struct platform_device *pdev)
1148 {
1149         struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1150
1151         dma_async_device_unregister(&imxdma->dma_device);
1152
1153         clk_disable_unprepare(imxdma->dma_ipg);
1154         clk_disable_unprepare(imxdma->dma_ahb);
1155
1156         return 0;
1157 }
1158
1159 static struct platform_driver imxdma_driver = {
1160         .driver         = {
1161                 .name   = "imx-dma",
1162         },
1163         .id_table       = imx_dma_devtype,
1164         .remove         = imxdma_remove,
1165 };
1166
1167 static int __init imxdma_module_init(void)
1168 {
1169         return platform_driver_probe(&imxdma_driver, imxdma_probe);
1170 }
1171 subsys_initcall(imxdma_module_init);
1172
1173 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1174 MODULE_DESCRIPTION("i.MX dma driver");
1175 MODULE_LICENSE("GPL");