kernel/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 #include <linux/of_device.h>
  31 #include <linux/of_dma.h>
  32
  33 #include <asm/irq.h>
  34 #include <linux/platform_data/dma-imx.h>
  35
  36 #include "dmaengine.h"
  37 #define IMXDMA_MAX_CHAN_DESCRIPTORS     16
  38 #define IMX_DMA_CHANNELS  16
  39
  40 #define IMX_DMA_2D_SLOTS        2
  41 #define IMX_DMA_2D_SLOT_A       0
  42 #define IMX_DMA_2D_SLOT_B       1
  43
  44 #define IMX_DMA_LENGTH_LOOP     ((unsigned int)-1)
  45 #define IMX_DMA_MEMSIZE_32      (0 << 4)
  46 #define IMX_DMA_MEMSIZE_8       (1 << 4)
  47 #define IMX_DMA_MEMSIZE_16      (2 << 4)
  48 #define IMX_DMA_TYPE_LINEAR     (0 << 10)
  49 #define IMX_DMA_TYPE_2D         (1 << 10)
  50 #define IMX_DMA_TYPE_FIFO       (2 << 10)
  51
  52 #define IMX_DMA_ERR_BURST     (1 << 0)
  53 #define IMX_DMA_ERR_REQUEST   (1 << 1)
  54 #define IMX_DMA_ERR_TRANSFER  (1 << 2)
  55 #define IMX_DMA_ERR_BUFFER    (1 << 3)
  56 #define IMX_DMA_ERR_TIMEOUT   (1 << 4)
  57
  58 #define DMA_DCR     0x00                /* Control Register */
  59 #define DMA_DISR    0x04                /* Interrupt status Register */
  60 #define DMA_DIMR    0x08                /* Interrupt mask Register */
  61 #define DMA_DBTOSR  0x0c                /* Burst timeout status Register */
  62 #define DMA_DRTOSR  0x10                /* Request timeout Register */
  63 #define DMA_DSESR   0x14                /* Transfer Error Status Register */
  64 #define DMA_DBOSR   0x18                /* Buffer overflow status Register */
  65 #define DMA_DBTOCR  0x1c                /* Burst timeout control Register */
  66 #define DMA_WSRA    0x40                /* W-Size Register A */
  67 #define DMA_XSRA    0x44                /* X-Size Register A */
  68 #define DMA_YSRA    0x48                /* Y-Size Register A */
  69 #define DMA_WSRB    0x4c                /* W-Size Register B */
  70 #define DMA_XSRB    0x50                /* X-Size Register B */
  71 #define DMA_YSRB    0x54                /* Y-Size Register B */
  72 #define DMA_SAR(x)  (0x80 + ((x) << 6)) /* Source Address Registers */
  73 #define DMA_DAR(x)  (0x84 + ((x) << 6)) /* Destination Address Registers */
  74 #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */
  75 #define DMA_CCR(x)  (0x8c + ((x) << 6)) /* Control Registers */
  76 #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */
  77 #define DMA_BLR(x)  (0x94 + ((x) << 6)) /* Burst length Registers */
  78 #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */
  79 #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */
  80 #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */
  81
  82 #define DCR_DRST           (1<<1)
  83 #define DCR_DEN            (1<<0)
  84 #define DBTOCR_EN          (1<<15)
  85 #define DBTOCR_CNT(x)      ((x) & 0x7fff)
  86 #define CNTR_CNT(x)        ((x) & 0xffffff)
  87 #define CCR_ACRPT          (1<<14)
  88 #define CCR_DMOD_LINEAR    (0x0 << 12)
  89 #define CCR_DMOD_2D        (0x1 << 12)
  90 #define CCR_DMOD_FIFO      (0x2 << 12)
  91 #define CCR_DMOD_EOBFIFO   (0x3 << 12)
  92 #define CCR_SMOD_LINEAR    (0x0 << 10)
  93 #define CCR_SMOD_2D        (0x1 << 10)
  94 #define CCR_SMOD_FIFO      (0x2 << 10)
  95 #define CCR_SMOD_EOBFIFO   (0x3 << 10)
  96 #define CCR_MDIR_DEC       (1<<9)
  97 #define CCR_MSEL_B         (1<<8)
  98 #define CCR_DSIZ_32        (0x0 << 6)
  99 #define CCR_DSIZ_8         (0x1 << 6)
 100 #define CCR_DSIZ_16        (0x2 << 6)
 101 #define CCR_SSIZ_32        (0x0 << 4)
 102 #define CCR_SSIZ_8         (0x1 << 4)
 103 #define CCR_SSIZ_16        (0x2 << 4)
 104 #define CCR_REN            (1<<3)
 105 #define CCR_RPT            (1<<2)
 106 #define CCR_FRC            (1<<1)
 107 #define CCR_CEN            (1<<0)
 108 #define RTOR_EN            (1<<15)
 109 #define RTOR_CLK           (1<<14)
 110 #define RTOR_PSC           (1<<13)
 111
 112 enum  imxdma_prep_type {
 113         IMXDMA_DESC_MEMCPY,
 114         IMXDMA_DESC_INTERLEAVED,
 115         IMXDMA_DESC_SLAVE_SG,
 116         IMXDMA_DESC_CYCLIC,
 117 };
 118
 119 struct imx_dma_2d_config {
 120         u16             xsr;
 121         u16             ysr;
 122         u16             wsr;
 123         int             count;
 124 };
 125
 126 struct imxdma_desc {
 127         struct list_head                node;
 128         struct dma_async_tx_descriptor  desc;
 129         enum dma_status                 status;
 130         dma_addr_t                      src;
 131         dma_addr_t                      dest;
 132         size_t                          len;
 133         enum dma_transfer_direction     direction;
 134         enum imxdma_prep_type           type;
 135         /* For memcpy and interleaved */
 136         unsigned int                    config_port;
 137         unsigned int                    config_mem;
 138         /* For interleaved transfers */
 139         unsigned int                    x;
 140         unsigned int                    y;
 141         unsigned int                    w;
 142         /* For slave sg and cyclic */
 143         struct scatterlist              *sg;
 144         unsigned int                    sgcount;
 145 };
 146
 147 struct imxdma_channel {
 148         int                             hw_chaining;
 149         struct timer_list               watchdog;
 150         struct imxdma_engine            *imxdma;
 151         unsigned int                    channel;
 152
 153         struct tasklet_struct           dma_tasklet;
 154         struct list_head                ld_free;
 155         struct list_head                ld_queue;
 156         struct list_head                ld_active;
 157         int                             descs_allocated;
 158         enum dma_slave_buswidth         word_size;
 159         dma_addr_t                      per_address;
 160         u32                             watermark_level;
 161         struct dma_chan                 chan;
 162         struct dma_async_tx_descriptor  desc;
 163         enum dma_status                 status;
 164         int                             dma_request;
 165         struct scatterlist              *sg_list;
 166         u32                             ccr_from_device;
 167         u32                             ccr_to_device;
 168         bool                            enabled_2d;
 169         int                             slot_2d;
 170 };
 171
 172 enum imx_dma_type {
 173         IMX1_DMA,
 174         IMX21_DMA,
 175         IMX27_DMA,
 176 };
 177
 178 struct imxdma_engine {
 179         struct device                   *dev;
 180         struct device_dma_parameters    dma_parms;
 181         struct dma_device               dma_device;
 182         void __iomem                    *base;
 183         struct clk                      *dma_ahb;
 184         struct clk                      *dma_ipg;
 185         spinlock_t                      lock;
 186         struct imx_dma_2d_config        slots_2d[IMX_DMA_2D_SLOTS];
 187         struct imxdma_channel           channel[IMX_DMA_CHANNELS];
 188         enum imx_dma_type               devtype;
 189 };
 190
 191 struct imxdma_filter_data {
 192         struct imxdma_engine    *imxdma;
 193         int                      request;
 194 };
 195
 196 static struct platform_device_id imx_dma_devtype[] = {
 197         {
 198                 .name = "imx1-dma",
 199                 .driver_data = IMX1_DMA,
 200         }, {
 201                 .name = "imx21-dma",
 202                 .driver_data = IMX21_DMA,
 203         }, {
 204                 .name = "imx27-dma",
 205                 .driver_data = IMX27_DMA,
 206         }, {
 207                 /* sentinel */
 208         }
 209 };
 210 MODULE_DEVICE_TABLE(platform, imx_dma_devtype);
 211
 212 static const struct of_device_id imx_dma_of_dev_id[] = {
 213         {
 214                 .compatible = "fsl,imx1-dma",
 215                 .data = &imx_dma_devtype[IMX1_DMA],
 216         }, {
 217                 .compatible = "fsl,imx21-dma",
 218                 .data = &imx_dma_devtype[IMX21_DMA],
 219         }, {
 220                 .compatible = "fsl,imx27-dma",
 221                 .data = &imx_dma_devtype[IMX27_DMA],
 222         }, {
 223                 /* sentinel */
 224         }
 225 };
 226 MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id);
 227
 228 static inline int is_imx1_dma(struct imxdma_engine *imxdma)
 229 {
 230         return imxdma->devtype == IMX1_DMA;
 231 }
 232
 233 static inline int is_imx27_dma(struct imxdma_engine *imxdma)
 234 {
 235         return imxdma->devtype == IMX27_DMA;
 236 }
 237
 238 static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan)
 239 {
 240         return container_of(chan, struct imxdma_channel, chan);
 241 }
 242
 243 static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac)
 244 {
 245         struct imxdma_desc *desc;
 246
 247         if (!list_empty(&imxdmac->ld_active)) {
 248                 desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc,
 249                                         node);
 250                 if (desc->type == IMXDMA_DESC_CYCLIC)
 251                         return true;
 252         }
 253         return false;
 254 }
 255
 256
 257
 258 static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val,
 259                              unsigned offset)
 260 {
 261         __raw_writel(val, imxdma->base + offset);
 262 }
 263
 264 static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset)
 265 {
 266         return __raw_readl(imxdma->base + offset);
 267 }
 268
 269 static int imxdma_hw_chain(struct imxdma_channel *imxdmac)
 270 {
 271         struct imxdma_engine *imxdma = imxdmac->imxdma;
 272
 273         if (is_imx27_dma(imxdma))
 274                 return imxdmac->hw_chaining;
 275         else
 276                 return 0;
 277 }
 278
 279 /*
 280  * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
 281  */
 282 static inline int imxdma_sg_next(struct imxdma_desc *d)
 283 {
 284         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 285         struct imxdma_engine *imxdma = imxdmac->imxdma;
 286         struct scatterlist *sg = d->sg;
 287         unsigned long now;
 288
 289         now = min(d->len, sg_dma_len(sg));
 290         if (d->len != IMX_DMA_LENGTH_LOOP)
 291                 d->len -= now;
 292
 293         if (d->direction == DMA_DEV_TO_MEM)
 294                 imx_dmav1_writel(imxdma, sg->dma_address,
 295                                  DMA_DAR(imxdmac->channel));
 296         else
 297                 imx_dmav1_writel(imxdma, sg->dma_address,
 298                                  DMA_SAR(imxdmac->channel));
 299
 300         imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel));
 301
 302         dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, "
 303                 "size 0x%08x\n", __func__, imxdmac->channel,
 304                  imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
 305                  imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
 306                  imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
 307
 308         return now;
 309 }
 310
 311 static void imxdma_enable_hw(struct imxdma_desc *d)
 312 {
 313         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 314         struct imxdma_engine *imxdma = imxdmac->imxdma;
 315         int channel = imxdmac->channel;
 316         unsigned long flags;
 317
 318         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 319
 320         local_irq_save(flags);
 321
 322         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 323         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) &
 324                          ~(1 << channel), DMA_DIMR);
 325         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) |
 326                          CCR_CEN | CCR_ACRPT, DMA_CCR(channel));
 327
 328         if (!is_imx1_dma(imxdma) &&
 329                         d->sg && imxdma_hw_chain(imxdmac)) {
 330                 d->sg = sg_next(d->sg);
 331                 if (d->sg) {
 332                         u32 tmp;
 333                         imxdma_sg_next(d);
 334                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel));
 335                         imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT,
 336                                          DMA_CCR(channel));
 337                 }
 338         }
 339
 340         local_irq_restore(flags);
 341 }
 342
 343 static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
 344 {
 345         struct imxdma_engine *imxdma = imxdmac->imxdma;
 346         int channel = imxdmac->channel;
 347         unsigned long flags;
 348
 349         dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel);
 350
 351         if (imxdma_hw_chain(imxdmac))
 352                 del_timer(&imxdmac->watchdog);
 353
 354         local_irq_save(flags);
 355         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) |
 356                          (1 << channel), DMA_DIMR);
 357         imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) &
 358                          ~CCR_CEN, DMA_CCR(channel));
 359         imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR);
 360         local_irq_restore(flags);
 361 }
 362
 363 static void imxdma_watchdog(unsigned long data)
 364 {
 365         struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
 366         struct imxdma_engine *imxdma = imxdmac->imxdma;
 367         int channel = imxdmac->channel;
 368
 369         imx_dmav1_writel(imxdma, 0, DMA_CCR(channel));
 370
 371         /* Tasklet watchdog error handler */
 372         tasklet_schedule(&imxdmac->dma_tasklet);
 373         dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n",
 374                 imxdmac->channel);
 375 }
 376
 377 static irqreturn_t imxdma_err_handler(int irq, void *dev_id)
 378 {
 379         struct imxdma_engine *imxdma = dev_id;
 380         unsigned int err_mask;
 381         int i, disr;
 382         int errcode;
 383
 384         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 385
 386         err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) |
 387                    imx_dmav1_readl(imxdma, DMA_DRTOSR) |
 388                    imx_dmav1_readl(imxdma, DMA_DSESR)  |
 389                    imx_dmav1_readl(imxdma, DMA_DBOSR);
 390
 391         if (!err_mask)
 392                 return IRQ_HANDLED;
 393
 394         imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR);
 395
 396         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 397                 if (!(err_mask & (1 << i)))
 398                         continue;
 399                 errcode = 0;
 400
 401                 if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) {
 402                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR);
 403                         errcode |= IMX_DMA_ERR_BURST;
 404                 }
 405                 if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) {
 406                         imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR);
 407                         errcode |= IMX_DMA_ERR_REQUEST;
 408                 }
 409                 if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) {
 410                         imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR);
 411                         errcode |= IMX_DMA_ERR_TRANSFER;
 412                 }
 413                 if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) {
 414                         imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR);
 415                         errcode |= IMX_DMA_ERR_BUFFER;
 416                 }
 417                 /* Tasklet error handler */
 418                 tasklet_schedule(&imxdma->channel[i].dma_tasklet);
 419
 420                 dev_warn(imxdma->dev,
 421                          "DMA timeout on channel %d -%s%s%s%s\n", i,
 422                          errcode & IMX_DMA_ERR_BURST ?    " burst" : "",
 423                          errcode & IMX_DMA_ERR_REQUEST ?  " request" : "",
 424                          errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
 425                          errcode & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
 426         }
 427         return IRQ_HANDLED;
 428 }
 429
 430 static void dma_irq_handle_channel(struct imxdma_channel *imxdmac)
 431 {
 432         struct imxdma_engine *imxdma = imxdmac->imxdma;
 433         int chno = imxdmac->channel;
 434         struct imxdma_desc *desc;
 435         unsigned long flags;
 436
 437         spin_lock_irqsave(&imxdma->lock, flags);
 438         if (list_empty(&imxdmac->ld_active)) {
 439                 spin_unlock_irqrestore(&imxdma->lock, flags);
 440                 goto out;
 441         }
 442
 443         desc = list_first_entry(&imxdmac->ld_active,
 444                                 struct imxdma_desc,
 445                                 node);
 446         spin_unlock_irqrestore(&imxdma->lock, flags);
 447
 448         if (desc->sg) {
 449                 u32 tmp;
 450                 desc->sg = sg_next(desc->sg);
 451
 452                 if (desc->sg) {
 453                         imxdma_sg_next(desc);
 454
 455                         tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno));
 456
 457                         if (imxdma_hw_chain(imxdmac)) {
 458                                 /* FIXME: The timeout should probably be
 459                                  * configurable
 460                                  */
 461                                 mod_timer(&imxdmac->watchdog,
 462                                         jiffies + msecs_to_jiffies(500));
 463
 464                                 tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
 465                                 imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 466                         } else {
 467                                 imx_dmav1_writel(imxdma, tmp & ~CCR_CEN,
 468                                                  DMA_CCR(chno));
 469                                 tmp |= CCR_CEN;
 470                         }
 471
 472                         imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno));
 473
 474                         if (imxdma_chan_is_doing_cyclic(imxdmac))
 475                                 /* Tasklet progression */
 476                                 tasklet_schedule(&imxdmac->dma_tasklet);
 477
 478                         return;
 479                 }
 480
 481                 if (imxdma_hw_chain(imxdmac)) {
 482                         del_timer(&imxdmac->watchdog);
 483                         return;
 484                 }
 485         }
 486
 487 out:
 488         imx_dmav1_writel(imxdma, 0, DMA_CCR(chno));
 489         /* Tasklet irq */
 490         tasklet_schedule(&imxdmac->dma_tasklet);
 491 }
 492
 493 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
 494 {
 495         struct imxdma_engine *imxdma = dev_id;
 496         int i, disr;
 497
 498         if (!is_imx1_dma(imxdma))
 499                 imxdma_err_handler(irq, dev_id);
 500
 501         disr = imx_dmav1_readl(imxdma, DMA_DISR);
 502
 503         dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr);
 504
 505         imx_dmav1_writel(imxdma, disr, DMA_DISR);
 506         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
 507                 if (disr & (1 << i))
 508                         dma_irq_handle_channel(&imxdma->channel[i]);
 509         }
 510
 511         return IRQ_HANDLED;
 512 }
 513
 514 static int imxdma_xfer_desc(struct imxdma_desc *d)
 515 {
 516         struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
 517         struct imxdma_engine *imxdma = imxdmac->imxdma;
 518         int slot = -1;
 519         int i;
 520
 521         /* Configure and enable */
 522         switch (d->type) {
 523         case IMXDMA_DESC_INTERLEAVED:
 524                 /* Try to get a free 2D slot */
 525                 for (i = 0; i < IMX_DMA_2D_SLOTS; i++) {
 526                         if ((imxdma->slots_2d[i].count > 0) &&
 527                         ((imxdma->slots_2d[i].xsr != d->x) ||
 528                         (imxdma->slots_2d[i].ysr != d->y) ||
 529                         (imxdma->slots_2d[i].wsr != d->w)))
 530                                 continue;
 531                         slot = i;
 532                         break;
 533                 }
 534                 if (slot < 0)
 535                         return -EBUSY;
 536
 537                 imxdma->slots_2d[slot].xsr = d->x;
 538                 imxdma->slots_2d[slot].ysr = d->y;
 539                 imxdma->slots_2d[slot].wsr = d->w;
 540                 imxdma->slots_2d[slot].count++;
 541
 542                 imxdmac->slot_2d = slot;
 543                 imxdmac->enabled_2d = true;
 544
 545                 if (slot == IMX_DMA_2D_SLOT_A) {
 546                         d->config_mem &= ~CCR_MSEL_B;
 547                         d->config_port &= ~CCR_MSEL_B;
 548                         imx_dmav1_writel(imxdma, d->x, DMA_XSRA);
 549                         imx_dmav1_writel(imxdma, d->y, DMA_YSRA);
 550                         imx_dmav1_writel(imxdma, d->w, DMA_WSRA);
 551                 } else {
 552                         d->config_mem |= CCR_MSEL_B;
 553                         d->config_port |= CCR_MSEL_B;
 554                         imx_dmav1_writel(imxdma, d->x, DMA_XSRB);
 555                         imx_dmav1_writel(imxdma, d->y, DMA_YSRB);
 556                         imx_dmav1_writel(imxdma, d->w, DMA_WSRB);
 557                 }
 558                 /*
 559                  * We fall-through here intentionally, since a 2D transfer is
 560                  * similar to MEMCPY just adding the 2D slot configuration.
 561                  */
 562         case IMXDMA_DESC_MEMCPY:
 563                 imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
 564                 imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
 565                 imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2),
 566                          DMA_CCR(imxdmac->channel));
 567
 568                 imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel));
 569
 570                 dev_dbg(imxdma->dev,
 571                         "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n",
 572                         __func__, imxdmac->channel,
 573                         (unsigned long long)d->dest,
 574                         (unsigned long long)d->src, d->len);
 575
 576                 break;
 577         /* Cyclic transfer is the same as slave_sg with special sg configuration. */
 578         case IMXDMA_DESC_CYCLIC:
 579         case IMXDMA_DESC_SLAVE_SG:
 580                 if (d->direction == DMA_DEV_TO_MEM) {
 581                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 582                                          DMA_SAR(imxdmac->channel));
 583                         imx_dmav1_writel(imxdma, imxdmac->ccr_from_device,
 584                                          DMA_CCR(imxdmac->channel));
 585
 586                         dev_dbg(imxdma->dev,
 587                                 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n",
 588                                 __func__, imxdmac->channel,
 589                                 d->sg, d->sgcount, d->len,
 590                                 (unsigned long long)imxdmac->per_address);
 591                 } else if (d->direction == DMA_MEM_TO_DEV) {
 592                         imx_dmav1_writel(imxdma, imxdmac->per_address,
 593                                          DMA_DAR(imxdmac->channel));
 594                         imx_dmav1_writel(imxdma, imxdmac->ccr_to_device,
 595                                          DMA_CCR(imxdmac->channel));
 596
 597                         dev_dbg(imxdma->dev,
 598                                 "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n",
 599                                 __func__, imxdmac->channel,
 600                                 d->sg, d->sgcount, d->len,
 601                                 (unsigned long long)imxdmac->per_address);
 602                 } else {
 603                         dev_err(imxdma->dev, "%s channel: %d bad dma mode\n",
 604                                 __func__, imxdmac->channel);
 605                         return -EINVAL;
 606                 }
 607
 608                 imxdma_sg_next(d);
 609
 610                 break;
 611         default:
 612                 return -EINVAL;
 613         }
 614         imxdma_enable_hw(d);
 615         return 0;
 616 }
 617
 618 static void imxdma_tasklet(unsigned long data)
 619 {
 620         struct imxdma_channel *imxdmac = (void *)data;
 621         struct imxdma_engine *imxdma = imxdmac->imxdma;
 622         struct imxdma_desc *desc;
 623         unsigned long flags;
 624
 625         spin_lock_irqsave(&imxdma->lock, flags);
 626
 627         if (list_empty(&imxdmac->ld_active)) {
 628                 /* Someone might have called terminate all */
 629                 spin_unlock_irqrestore(&imxdma->lock, flags);
 630                 return;
 631         }
 632         desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
 633
 634         /* If we are dealing with a cyclic descriptor, keep it on ld_active
 635          * and dont mark the descriptor as complete.
 636          * Only in non-cyclic cases it would be marked as complete
 637          */
 638         if (imxdma_chan_is_doing_cyclic(imxdmac))
 639                 goto out;
 640         else
 641                 dma_cookie_complete(&desc->desc);
 642
 643         /* Free 2D slot if it was an interleaved transfer */
 644         if (imxdmac->enabled_2d) {
 645                 imxdma->slots_2d[imxdmac->slot_2d].count--;
 646                 imxdmac->enabled_2d = false;
 647         }
 648
 649         list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free);
 650
 651         if (!list_empty(&imxdmac->ld_queue)) {
 652                 desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc,
 653                                         node);
 654                 list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active);
 655                 if (imxdma_xfer_desc(desc) < 0)
 656                         dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n",
 657                                  __func__, imxdmac->channel);
 658         }
 659 out:
 660         spin_unlock_irqrestore(&imxdma->lock, flags);
 661
 662         if (desc->desc.callback)
 663                 desc->desc.callback(desc->desc.callback_param);
 664
 665 }
 666
 667 static int imxdma_terminate_all(struct dma_chan *chan)
 668 {
 669         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 670         struct imxdma_engine *imxdma = imxdmac->imxdma;
 671         unsigned long flags;
 672
 673         imxdma_disable_hw(imxdmac);
 674
 675         spin_lock_irqsave(&imxdma->lock, flags);
 676         list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 677         list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 678         spin_unlock_irqrestore(&imxdma->lock, flags);
 679         return 0;
 680 }
 681
 682 static int imxdma_config(struct dma_chan *chan,
 683                          struct dma_slave_config *dmaengine_cfg)
 684 {
 685         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 686         struct imxdma_engine *imxdma = imxdmac->imxdma;
 687         unsigned int mode = 0;
 688
 689         if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
 690                 imxdmac->per_address = dmaengine_cfg->src_addr;
 691                 imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
 692                 imxdmac->word_size = dmaengine_cfg->src_addr_width;
 693         } else {
 694                 imxdmac->per_address = dmaengine_cfg->dst_addr;
 695                 imxdmac->watermark_level = dmaengine_cfg->dst_maxburst;
 696                 imxdmac->word_size = dmaengine_cfg->dst_addr_width;
 697         }
 698
 699         switch (imxdmac->word_size) {
 700         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 701                 mode = IMX_DMA_MEMSIZE_8;
 702                 break;
 703         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 704                 mode = IMX_DMA_MEMSIZE_16;
 705                 break;
 706         default:
 707         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 708                 mode = IMX_DMA_MEMSIZE_32;
 709                 break;
 710         }
 711
 712         imxdmac->hw_chaining = 0;
 713
 714         imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) |
 715                 ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) |
 716                 CCR_REN;
 717         imxdmac->ccr_to_device =
 718                 (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) |
 719                 ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN;
 720         imx_dmav1_writel(imxdma, imxdmac->dma_request,
 721                          DMA_RSSR(imxdmac->channel));
 722
 723         /* Set burst length */
 724         imx_dmav1_writel(imxdma, imxdmac->watermark_level *
 725                          imxdmac->word_size, DMA_BLR(imxdmac->channel));
 726
 727         return 0;
 728 }
 729
 730 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
 731                                             dma_cookie_t cookie,
 732                                             struct dma_tx_state *txstate)
 733 {
 734         return dma_cookie_status(chan, cookie, txstate);
 735 }
 736
 737 static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
 738 {
 739         struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan);
 740         struct imxdma_engine *imxdma = imxdmac->imxdma;
 741         dma_cookie_t cookie;
 742         unsigned long flags;
 743
 744         spin_lock_irqsave(&imxdma->lock, flags);
 745         list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue);
 746         cookie = dma_cookie_assign(tx);
 747         spin_unlock_irqrestore(&imxdma->lock, flags);
 748
 749         return cookie;
 750 }
 751
 752 static int imxdma_alloc_chan_resources(struct dma_chan *chan)
 753 {
 754         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 755         struct imx_dma_data *data = chan->private;
 756
 757         if (data != NULL)
 758                 imxdmac->dma_request = data->dma_request;
 759
 760         while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) {
 761                 struct imxdma_desc *desc;
 762
 763                 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 764                 if (!desc)
 765                         break;
 766                 __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor));
 767                 dma_async_tx_descriptor_init(&desc->desc, chan);
 768                 desc->desc.tx_submit = imxdma_tx_submit;
 769                 /* txd.flags will be overwritten in prep funcs */
 770                 desc->desc.flags = DMA_CTRL_ACK;
 771                 desc->status = DMA_COMPLETE;
 772
 773                 list_add_tail(&desc->node, &imxdmac->ld_free);
 774                 imxdmac->descs_allocated++;
 775         }
 776
 777         if (!imxdmac->descs_allocated)
 778                 return -ENOMEM;
 779
 780         return imxdmac->descs_allocated;
 781 }
 782
 783 static void imxdma_free_chan_resources(struct dma_chan *chan)
 784 {
 785         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 786         struct imxdma_engine *imxdma = imxdmac->imxdma;
 787         struct imxdma_desc *desc, *_desc;
 788         unsigned long flags;
 789
 790         spin_lock_irqsave(&imxdma->lock, flags);
 791
 792         imxdma_disable_hw(imxdmac);
 793         list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free);
 794         list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free);
 795
 796         spin_unlock_irqrestore(&imxdma->lock, flags);
 797
 798         list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) {
 799                 kfree(desc);
 800                 imxdmac->descs_allocated--;
 801         }
 802         INIT_LIST_HEAD(&imxdmac->ld_free);
 803
 804         kfree(imxdmac->sg_list);
 805         imxdmac->sg_list = NULL;
 806 }
 807
 808 static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
 809                 struct dma_chan *chan, struct scatterlist *sgl,
 810                 unsigned int sg_len, enum dma_transfer_direction direction,
 811                 unsigned long flags, void *context)
 812 {
 813         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 814         struct scatterlist *sg;
 815         int i, dma_length = 0;
 816         struct imxdma_desc *desc;
 817
 818         if (list_empty(&imxdmac->ld_free) ||
 819             imxdma_chan_is_doing_cyclic(imxdmac))
 820                 return NULL;
 821
 822         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 823
 824         for_each_sg(sgl, sg, sg_len, i) {
 825                 dma_length += sg_dma_len(sg);
 826         }
 827
 828         switch (imxdmac->word_size) {
 829         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 830                 if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
 831                         return NULL;
 832                 break;
 833         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 834                 if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1)
 835                         return NULL;
 836                 break;
 837         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 838                 break;
 839         default:
 840                 return NULL;
 841         }
 842
 843         desc->type = IMXDMA_DESC_SLAVE_SG;
 844         desc->sg = sgl;
 845         desc->sgcount = sg_len;
 846         desc->len = dma_length;
 847         desc->direction = direction;
 848         if (direction == DMA_DEV_TO_MEM) {
 849                 desc->src = imxdmac->per_address;
 850         } else {
 851                 desc->dest = imxdmac->per_address;
 852         }
 853         desc->desc.callback = NULL;
 854         desc->desc.callback_param = NULL;
 855
 856         return &desc->desc;
 857 }
 858
 859 static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
 860                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 861                 size_t period_len, enum dma_transfer_direction direction,
 862                 unsigned long flags)
 863 {
 864         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 865         struct imxdma_engine *imxdma = imxdmac->imxdma;
 866         struct imxdma_desc *desc;
 867         int i;
 868         unsigned int periods = buf_len / period_len;
 869
 870         dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n",
 871                         __func__, imxdmac->channel, buf_len, period_len);
 872
 873         if (list_empty(&imxdmac->ld_free) ||
 874             imxdma_chan_is_doing_cyclic(imxdmac))
 875                 return NULL;
 876
 877         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 878
 879         kfree(imxdmac->sg_list);
 880
 881         imxdmac->sg_list = kcalloc(periods + 1,
 882                         sizeof(struct scatterlist), GFP_ATOMIC);
 883         if (!imxdmac->sg_list)
 884                 return NULL;
 885
 886         sg_init_table(imxdmac->sg_list, periods);
 887
 888         for (i = 0; i < periods; i++) {
 889                 imxdmac->sg_list[i].page_link = 0;
 890                 imxdmac->sg_list[i].offset = 0;
 891                 imxdmac->sg_list[i].dma_address = dma_addr;
 892                 sg_dma_len(&imxdmac->sg_list[i]) = period_len;
 893                 dma_addr += period_len;
 894         }
 895
 896         /* close the loop */
 897         imxdmac->sg_list[periods].offset = 0;
 898         sg_dma_len(&imxdmac->sg_list[periods]) = 0;
 899         imxdmac->sg_list[periods].page_link =
 900                 ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02;
 901
 902         desc->type = IMXDMA_DESC_CYCLIC;
 903         desc->sg = imxdmac->sg_list;
 904         desc->sgcount = periods;
 905         desc->len = IMX_DMA_LENGTH_LOOP;
 906         desc->direction = direction;
 907         if (direction == DMA_DEV_TO_MEM) {
 908                 desc->src = imxdmac->per_address;
 909         } else {
 910                 desc->dest = imxdmac->per_address;
 911         }
 912         desc->desc.callback = NULL;
 913         desc->desc.callback_param = NULL;
 914
 915         return &desc->desc;
 916 }
 917
 918 static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy(
 919         struct dma_chan *chan, dma_addr_t dest,
 920         dma_addr_t src, size_t len, unsigned long flags)
 921 {
 922         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 923         struct imxdma_engine *imxdma = imxdmac->imxdma;
 924         struct imxdma_desc *desc;
 925
 926         dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n",
 927                 __func__, imxdmac->channel, (unsigned long long)src,
 928                 (unsigned long long)dest, len);
 929
 930         if (list_empty(&imxdmac->ld_free) ||
 931             imxdma_chan_is_doing_cyclic(imxdmac))
 932                 return NULL;
 933
 934         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 935
 936         desc->type = IMXDMA_DESC_MEMCPY;
 937         desc->src = src;
 938         desc->dest = dest;
 939         desc->len = len;
 940         desc->direction = DMA_MEM_TO_MEM;
 941         desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 942         desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR;
 943         desc->desc.callback = NULL;
 944         desc->desc.callback_param = NULL;
 945
 946         return &desc->desc;
 947 }
 948
 949 static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved(
 950         struct dma_chan *chan, struct dma_interleaved_template *xt,
 951         unsigned long flags)
 952 {
 953         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 954         struct imxdma_engine *imxdma = imxdmac->imxdma;
 955         struct imxdma_desc *desc;
 956
 957         dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n"
 958                 "   src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__,
 959                 imxdmac->channel, (unsigned long long)xt->src_start,
 960                 (unsigned long long) xt->dst_start,
 961                 xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false",
 962                 xt->numf, xt->frame_size);
 963
 964         if (list_empty(&imxdmac->ld_free) ||
 965             imxdma_chan_is_doing_cyclic(imxdmac))
 966                 return NULL;
 967
 968         if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM)
 969                 return NULL;
 970
 971         desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node);
 972
 973         desc->type = IMXDMA_DESC_INTERLEAVED;
 974         desc->src = xt->src_start;
 975         desc->dest = xt->dst_start;
 976         desc->x = xt->sgl[0].size;
 977         desc->y = xt->numf;
 978         desc->w = xt->sgl[0].icg + desc->x;
 979         desc->len = desc->x * desc->y;
 980         desc->direction = DMA_MEM_TO_MEM;
 981         desc->config_port = IMX_DMA_MEMSIZE_32;
 982         desc->config_mem = IMX_DMA_MEMSIZE_32;
 983         if (xt->src_sgl)
 984                 desc->config_mem |= IMX_DMA_TYPE_2D;
 985         if (xt->dst_sgl)
 986                 desc->config_port |= IMX_DMA_TYPE_2D;
 987         desc->desc.callback = NULL;
 988         desc->desc.callback_param = NULL;
 989
 990         return &desc->desc;
 991 }
 992
 993 static void imxdma_issue_pending(struct dma_chan *chan)
 994 {
 995         struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 996         struct imxdma_engine *imxdma = imxdmac->imxdma;
 997         struct imxdma_desc *desc;
 998         unsigned long flags;
 999
1000         spin_lock_irqsave(&imxdma->lock, flags);
1001         if (list_empty(&imxdmac->ld_active) &&
1002             !list_empty(&imxdmac->ld_queue)) {
1003                 desc = list_first_entry(&imxdmac->ld_queue,
1004                                         struct imxdma_desc, node);
1005
1006                 if (imxdma_xfer_desc(desc) < 0) {
1007                         dev_warn(imxdma->dev,
1008                                  "%s: channel: %d couldn't issue DMA xfer\n",
1009                                  __func__, imxdmac->channel);
1010                 } else {
1011                         list_move_tail(imxdmac->ld_queue.next,
1012                                        &imxdmac->ld_active);
1013                 }
1014         }
1015         spin_unlock_irqrestore(&imxdma->lock, flags);
1016 }
1017
1018 static bool imxdma_filter_fn(struct dma_chan *chan, void *param)
1019 {
1020         struct imxdma_filter_data *fdata = param;
1021         struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan);
1022
1023         if (chan->device->dev != fdata->imxdma->dev)
1024                 return false;
1025
1026         imxdma_chan->dma_request = fdata->request;
1027         chan->private = NULL;
1028
1029         return true;
1030 }
1031
1032 static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec,
1033                                                 struct of_dma *ofdma)
1034 {
1035         int count = dma_spec->args_count;
1036         struct imxdma_engine *imxdma = ofdma->of_dma_data;
1037         struct imxdma_filter_data fdata = {
1038                 .imxdma = imxdma,
1039         };
1040
1041         if (count != 1)
1042                 return NULL;
1043
1044         fdata.request = dma_spec->args[0];
1045
1046         return dma_request_channel(imxdma->dma_device.cap_mask,
1047                                         imxdma_filter_fn, &fdata);
1048 }
1049
1050 static int __init imxdma_probe(struct platform_device *pdev)
1051         {
1052         struct imxdma_engine *imxdma;
1053         struct resource *res;
1054         const struct of_device_id *of_id;
1055         int ret, i;
1056         int irq, irq_err;
1057
1058         of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev);
1059         if (of_id)
1060                 pdev->id_entry = of_id->data;
1061
1062         imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL);
1063         if (!imxdma)
1064                 return -ENOMEM;
1065
1066         imxdma->dev = &pdev->dev;
1067         imxdma->devtype = pdev->id_entry->driver_data;
1068
1069         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1070         imxdma->base = devm_ioremap_resource(&pdev->dev, res);
1071         if (IS_ERR(imxdma->base))
1072                 return PTR_ERR(imxdma->base);
1073
1074         irq = platform_get_irq(pdev, 0);
1075         if (irq < 0)
1076                 return irq;
1077
1078         imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg");
1079         if (IS_ERR(imxdma->dma_ipg))
1080                 return PTR_ERR(imxdma->dma_ipg);
1081
1082         imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb");
1083         if (IS_ERR(imxdma->dma_ahb))
1084                 return PTR_ERR(imxdma->dma_ahb);
1085
1086         clk_prepare_enable(imxdma->dma_ipg);
1087         clk_prepare_enable(imxdma->dma_ahb);
1088
1089         /* reset DMA module */
1090         imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR);
1091
1092         if (is_imx1_dma(imxdma)) {
1093                 ret = devm_request_irq(&pdev->dev, irq,
1094                                        dma_irq_handler, 0, "DMA", imxdma);
1095                 if (ret) {
1096                         dev_warn(imxdma->dev, "Can't register IRQ for DMA\n");
1097                         goto err;
1098                 }
1099
1100                 irq_err = platform_get_irq(pdev, 1);
1101                 if (irq_err < 0) {
1102                         ret = irq_err;
1103                         goto err;
1104                 }
1105
1106                 ret = devm_request_irq(&pdev->dev, irq_err,
1107                                        imxdma_err_handler, 0, "DMA", imxdma);
1108                 if (ret) {
1109                         dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n");
1110                         goto err;
1111                 }
1112         }
1113
1114         /* enable DMA module */
1115         imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR);
1116
1117         /* clear all interrupts */
1118         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR);
1119
1120         /* disable interrupts */
1121         imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR);
1122
1123         INIT_LIST_HEAD(&imxdma->dma_device.channels);
1124
1125         dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask);
1126         dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask);
1127         dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask);
1128         dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask);
1129
1130         /* Initialize 2D global parameters */
1131         for (i = 0; i < IMX_DMA_2D_SLOTS; i++)
1132                 imxdma->slots_2d[i].count = 0;
1133
1134         spin_lock_init(&imxdma->lock);
1135
1136         /* Initialize channel parameters */
1137         for (i = 0; i < IMX_DMA_CHANNELS; i++) {
1138                 struct imxdma_channel *imxdmac = &imxdma->channel[i];
1139
1140                 if (!is_imx1_dma(imxdma)) {
1141                         ret = devm_request_irq(&pdev->dev, irq + i,
1142                                         dma_irq_handler, 0, "DMA", imxdma);
1143                         if (ret) {
1144                                 dev_warn(imxdma->dev, "Can't register IRQ %d "
1145                                          "for DMA channel %d\n",
1146                                          irq + i, i);
1147                                 goto err;
1148                         }
1149                         init_timer(&imxdmac->watchdog);
1150                         imxdmac->watchdog.function = &imxdma_watchdog;
1151                         imxdmac->watchdog.data = (unsigned long)imxdmac;
1152                 }
1153
1154                 imxdmac->imxdma = imxdma;
1155
1156                 INIT_LIST_HEAD(&imxdmac->ld_queue);
1157                 INIT_LIST_HEAD(&imxdmac->ld_free);
1158                 INIT_LIST_HEAD(&imxdmac->ld_active);
1159
1160                 tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
1161                              (unsigned long)imxdmac);
1162                 imxdmac->chan.device = &imxdma->dma_device;
1163                 dma_cookie_init(&imxdmac->chan);
1164                 imxdmac->channel = i;
1165
1166                 /* Add the channel to the DMAC list */
1167                 list_add_tail(&imxdmac->chan.device_node,
1168                               &imxdma->dma_device.channels);
1169         }
1170
1171         imxdma->dma_device.dev = &pdev->dev;
1172
1173         imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources;
1174         imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources;
1175         imxdma->dma_device.device_tx_status = imxdma_tx_status;
1176         imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg;
1177         imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic;
1178         imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy;
1179         imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved;
1180         imxdma->dma_device.device_config = imxdma_config;
1181         imxdma->dma_device.device_terminate_all = imxdma_terminate_all;
1182         imxdma->dma_device.device_issue_pending = imxdma_issue_pending;
1183
1184         platform_set_drvdata(pdev, imxdma);
1185
1186         imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */
1187         imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
1188         dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
1189
1190         ret = dma_async_device_register(&imxdma->dma_device);
1191         if (ret) {
1192                 dev_err(&pdev->dev, "unable to register\n");
1193                 goto err;
1194         }
1195
1196         if (pdev->dev.of_node) {
1197                 ret = of_dma_controller_register(pdev->dev.of_node,
1198                                 imxdma_xlate, imxdma);
1199                 if (ret) {
1200                         dev_err(&pdev->dev, "unable to register of_dma_controller\n");
1201                         goto err_of_dma_controller;
1202                 }
1203         }
1204
1205         return 0;
1206
1207 err_of_dma_controller:
1208         dma_async_device_unregister(&imxdma->dma_device);
1209 err:
1210         clk_disable_unprepare(imxdma->dma_ipg);
1211         clk_disable_unprepare(imxdma->dma_ahb);
1212         return ret;
1213 }
1214
1215 static int imxdma_remove(struct platform_device *pdev)
1216 {
1217         struct imxdma_engine *imxdma = platform_get_drvdata(pdev);
1218
1219         dma_async_device_unregister(&imxdma->dma_device);
1220
1221         if (pdev->dev.of_node)
1222                 of_dma_controller_free(pdev->dev.of_node);
1223
1224         clk_disable_unprepare(imxdma->dma_ipg);
1225         clk_disable_unprepare(imxdma->dma_ahb);
1226
1227         return 0;
1228 }
1229
1230 static struct platform_driver imxdma_driver = {
1231         .driver         = {
1232                 .name   = "imx-dma",
1233                 .of_match_table = imx_dma_of_dev_id,
1234         },
1235         .id_table       = imx_dma_devtype,
1236         .remove         = imxdma_remove,
1237 };
1238
1239 static int __init imxdma_module_init(void)
1240 {
1241         return platform_driver_probe(&imxdma_driver, imxdma_probe);
1242 }
1243 subsys_initcall(imxdma_module_init);
1244
1245 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1246 MODULE_DESCRIPTION("i.MX dma driver");
1247 MODULE_LICENSE("GPL");