drivers/dma/imx-dma.c

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