linux/drivers/dma/mmp_tdma.c
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   1/*
   2 * Driver For Marvell Two-channel DMA Engine
   3 *
   4 * Copyright: Marvell International Ltd.
   5 *
   6 * The code contained herein is licensed under the GNU General Public
   7 * License. You may obtain a copy of the GNU General Public License
   8 * Version 2 or later at the following locations:
   9 *
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/types.h>
  15#include <linux/interrupt.h>
  16#include <linux/dma-mapping.h>
  17#include <linux/slab.h>
  18#include <linux/dmaengine.h>
  19#include <linux/platform_device.h>
  20#include <linux/device.h>
  21#include <mach/regs-icu.h>
  22#include <linux/platform_data/dma-mmp_tdma.h>
  23#include <linux/of_device.h>
  24
  25#include "dmaengine.h"
  26
  27/*
  28 * Two-Channel DMA registers
  29 */
  30#define TDBCR           0x00    /* Byte Count */
  31#define TDSAR           0x10    /* Src Addr */
  32#define TDDAR           0x20    /* Dst Addr */
  33#define TDNDPR          0x30    /* Next Desc */
  34#define TDCR            0x40    /* Control */
  35#define TDCP            0x60    /* Priority*/
  36#define TDCDPR          0x70    /* Current Desc */
  37#define TDIMR           0x80    /* Int Mask */
  38#define TDISR           0xa0    /* Int Status */
  39
  40/* Two-Channel DMA Control Register */
  41#define TDCR_SSZ_8_BITS         (0x0 << 22)     /* Sample Size */
  42#define TDCR_SSZ_12_BITS        (0x1 << 22)
  43#define TDCR_SSZ_16_BITS        (0x2 << 22)
  44#define TDCR_SSZ_20_BITS        (0x3 << 22)
  45#define TDCR_SSZ_24_BITS        (0x4 << 22)
  46#define TDCR_SSZ_32_BITS        (0x5 << 22)
  47#define TDCR_SSZ_SHIFT          (0x1 << 22)
  48#define TDCR_SSZ_MASK           (0x7 << 22)
  49#define TDCR_SSPMOD             (0x1 << 21)     /* SSP MOD */
  50#define TDCR_ABR                (0x1 << 20)     /* Channel Abort */
  51#define TDCR_CDE                (0x1 << 17)     /* Close Desc Enable */
  52#define TDCR_PACKMOD            (0x1 << 16)     /* Pack Mode (ADMA Only) */
  53#define TDCR_CHANACT            (0x1 << 14)     /* Channel Active */
  54#define TDCR_FETCHND            (0x1 << 13)     /* Fetch Next Desc */
  55#define TDCR_CHANEN             (0x1 << 12)     /* Channel Enable */
  56#define TDCR_INTMODE            (0x1 << 10)     /* Interrupt Mode */
  57#define TDCR_CHAINMOD           (0x1 << 9)      /* Chain Mode */
  58#define TDCR_BURSTSZ_MSK        (0x7 << 6)      /* Burst Size */
  59#define TDCR_BURSTSZ_4B         (0x0 << 6)
  60#define TDCR_BURSTSZ_8B         (0x1 << 6)
  61#define TDCR_BURSTSZ_16B        (0x3 << 6)
  62#define TDCR_BURSTSZ_32B        (0x6 << 6)
  63#define TDCR_BURSTSZ_64B        (0x7 << 6)
  64#define TDCR_BURSTSZ_SQU_32B    (0x7 << 6)
  65#define TDCR_BURSTSZ_128B       (0x5 << 6)
  66#define TDCR_DSTDIR_MSK         (0x3 << 4)      /* Dst Direction */
  67#define TDCR_DSTDIR_ADDR_HOLD   (0x2 << 4)      /* Dst Addr Hold */
  68#define TDCR_DSTDIR_ADDR_INC    (0x0 << 4)      /* Dst Addr Increment */
  69#define TDCR_SRCDIR_MSK         (0x3 << 2)      /* Src Direction */
  70#define TDCR_SRCDIR_ADDR_HOLD   (0x2 << 2)      /* Src Addr Hold */
  71#define TDCR_SRCDIR_ADDR_INC    (0x0 << 2)      /* Src Addr Increment */
  72#define TDCR_DSTDESCCONT        (0x1 << 1)
  73#define TDCR_SRCDESTCONT        (0x1 << 0)
  74
  75/* Two-Channel DMA Int Mask Register */
  76#define TDIMR_COMP              (0x1 << 0)
  77
  78/* Two-Channel DMA Int Status Register */
  79#define TDISR_COMP              (0x1 << 0)
  80
  81/*
  82 * Two-Channel DMA Descriptor Struct
  83 * NOTE: desc's buf must be aligned to 16 bytes.
  84 */
  85struct mmp_tdma_desc {
  86        u32 byte_cnt;
  87        u32 src_addr;
  88        u32 dst_addr;
  89        u32 nxt_desc;
  90};
  91
  92enum mmp_tdma_type {
  93        MMP_AUD_TDMA = 0,
  94        PXA910_SQU,
  95};
  96
  97#define TDMA_ALIGNMENT          3
  98#define TDMA_MAX_XFER_BYTES    SZ_64K
  99
 100struct mmp_tdma_chan {
 101        struct device                   *dev;
 102        struct dma_chan                 chan;
 103        struct dma_async_tx_descriptor  desc;
 104        struct tasklet_struct           tasklet;
 105
 106        struct mmp_tdma_desc            *desc_arr;
 107        phys_addr_t                     desc_arr_phys;
 108        int                             desc_num;
 109        enum dma_transfer_direction     dir;
 110        dma_addr_t                      dev_addr;
 111        u32                             burst_sz;
 112        enum dma_slave_buswidth         buswidth;
 113        enum dma_status                 status;
 114
 115        int                             idx;
 116        enum mmp_tdma_type              type;
 117        int                             irq;
 118        unsigned long                   reg_base;
 119
 120        size_t                          buf_len;
 121        size_t                          period_len;
 122        size_t                          pos;
 123};
 124
 125#define TDMA_CHANNEL_NUM 2
 126struct mmp_tdma_device {
 127        struct device                   *dev;
 128        void __iomem                    *base;
 129        struct dma_device               device;
 130        struct mmp_tdma_chan            *tdmac[TDMA_CHANNEL_NUM];
 131};
 132
 133#define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
 134
 135static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
 136{
 137        writel(phys, tdmac->reg_base + TDNDPR);
 138        writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND,
 139                                        tdmac->reg_base + TDCR);
 140}
 141
 142static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
 143{
 144        /* enable irq */
 145        writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
 146        /* enable dma chan */
 147        writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
 148                                        tdmac->reg_base + TDCR);
 149        tdmac->status = DMA_IN_PROGRESS;
 150}
 151
 152static void mmp_tdma_disable_chan(struct mmp_tdma_chan *tdmac)
 153{
 154        writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
 155                                        tdmac->reg_base + TDCR);
 156        tdmac->status = DMA_SUCCESS;
 157}
 158
 159static void mmp_tdma_resume_chan(struct mmp_tdma_chan *tdmac)
 160{
 161        writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
 162                                        tdmac->reg_base + TDCR);
 163        tdmac->status = DMA_IN_PROGRESS;
 164}
 165
 166static void mmp_tdma_pause_chan(struct mmp_tdma_chan *tdmac)
 167{
 168        writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
 169                                        tdmac->reg_base + TDCR);
 170        tdmac->status = DMA_PAUSED;
 171}
 172
 173static int mmp_tdma_config_chan(struct mmp_tdma_chan *tdmac)
 174{
 175        unsigned int tdcr;
 176
 177        mmp_tdma_disable_chan(tdmac);
 178
 179        if (tdmac->dir == DMA_MEM_TO_DEV)
 180                tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC;
 181        else if (tdmac->dir == DMA_DEV_TO_MEM)
 182                tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC;
 183
 184        if (tdmac->type == MMP_AUD_TDMA) {
 185                tdcr |= TDCR_PACKMOD;
 186
 187                switch (tdmac->burst_sz) {
 188                case 4:
 189                        tdcr |= TDCR_BURSTSZ_4B;
 190                        break;
 191                case 8:
 192                        tdcr |= TDCR_BURSTSZ_8B;
 193                        break;
 194                case 16:
 195                        tdcr |= TDCR_BURSTSZ_16B;
 196                        break;
 197                case 32:
 198                        tdcr |= TDCR_BURSTSZ_32B;
 199                        break;
 200                case 64:
 201                        tdcr |= TDCR_BURSTSZ_64B;
 202                        break;
 203                case 128:
 204                        tdcr |= TDCR_BURSTSZ_128B;
 205                        break;
 206                default:
 207                        dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n");
 208                        return -EINVAL;
 209                }
 210
 211                switch (tdmac->buswidth) {
 212                case DMA_SLAVE_BUSWIDTH_1_BYTE:
 213                        tdcr |= TDCR_SSZ_8_BITS;
 214                        break;
 215                case DMA_SLAVE_BUSWIDTH_2_BYTES:
 216                        tdcr |= TDCR_SSZ_16_BITS;
 217                        break;
 218                case DMA_SLAVE_BUSWIDTH_4_BYTES:
 219                        tdcr |= TDCR_SSZ_32_BITS;
 220                        break;
 221                default:
 222                        dev_err(tdmac->dev, "mmp_tdma: unknown bus size.\n");
 223                        return -EINVAL;
 224                }
 225        } else if (tdmac->type == PXA910_SQU) {
 226                tdcr |= TDCR_BURSTSZ_SQU_32B;
 227                tdcr |= TDCR_SSPMOD;
 228        }
 229
 230        writel(tdcr, tdmac->reg_base + TDCR);
 231        return 0;
 232}
 233
 234static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac)
 235{
 236        u32 reg = readl(tdmac->reg_base + TDISR);
 237
 238        if (reg & TDISR_COMP) {
 239                /* clear irq */
 240                reg &= ~TDISR_COMP;
 241                writel(reg, tdmac->reg_base + TDISR);
 242
 243                return 0;
 244        }
 245        return -EAGAIN;
 246}
 247
 248static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id)
 249{
 250        struct mmp_tdma_chan *tdmac = dev_id;
 251
 252        if (mmp_tdma_clear_chan_irq(tdmac) == 0) {
 253                tdmac->pos = (tdmac->pos + tdmac->period_len) % tdmac->buf_len;
 254                tasklet_schedule(&tdmac->tasklet);
 255                return IRQ_HANDLED;
 256        } else
 257                return IRQ_NONE;
 258}
 259
 260static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id)
 261{
 262        struct mmp_tdma_device *tdev = dev_id;
 263        int i, ret;
 264        int irq_num = 0;
 265
 266        for (i = 0; i < TDMA_CHANNEL_NUM; i++) {
 267                struct mmp_tdma_chan *tdmac = tdev->tdmac[i];
 268
 269                ret = mmp_tdma_chan_handler(irq, tdmac);
 270                if (ret == IRQ_HANDLED)
 271                        irq_num++;
 272        }
 273
 274        if (irq_num)
 275                return IRQ_HANDLED;
 276        else
 277                return IRQ_NONE;
 278}
 279
 280static void dma_do_tasklet(unsigned long data)
 281{
 282        struct mmp_tdma_chan *tdmac = (struct mmp_tdma_chan *)data;
 283
 284        if (tdmac->desc.callback)
 285                tdmac->desc.callback(tdmac->desc.callback_param);
 286
 287}
 288
 289static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
 290{
 291        struct gen_pool *gpool;
 292        int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
 293
 294        gpool = sram_get_gpool("asram");
 295        if (tdmac->desc_arr)
 296                gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
 297                                size);
 298        tdmac->desc_arr = NULL;
 299
 300        return;
 301}
 302
 303static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx)
 304{
 305        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan);
 306
 307        mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys);
 308
 309        return 0;
 310}
 311
 312static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan)
 313{
 314        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 315        int ret;
 316
 317        dma_async_tx_descriptor_init(&tdmac->desc, chan);
 318        tdmac->desc.tx_submit = mmp_tdma_tx_submit;
 319
 320        if (tdmac->irq) {
 321                ret = devm_request_irq(tdmac->dev, tdmac->irq,
 322                        mmp_tdma_chan_handler, IRQF_DISABLED, "tdma", tdmac);
 323                if (ret)
 324                        return ret;
 325        }
 326        return 1;
 327}
 328
 329static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
 330{
 331        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 332
 333        if (tdmac->irq)
 334                devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
 335        mmp_tdma_free_descriptor(tdmac);
 336        return;
 337}
 338
 339struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
 340{
 341        struct gen_pool *gpool;
 342        int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
 343
 344        gpool = sram_get_gpool("asram");
 345        if (!gpool)
 346                return NULL;
 347
 348        tdmac->desc_arr = (void *)gen_pool_alloc(gpool, size);
 349        if (!tdmac->desc_arr)
 350                return NULL;
 351
 352        tdmac->desc_arr_phys = gen_pool_virt_to_phys(gpool,
 353                        (unsigned long)tdmac->desc_arr);
 354
 355        return tdmac->desc_arr;
 356}
 357
 358static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
 359                struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 360                size_t period_len, enum dma_transfer_direction direction,
 361                unsigned long flags, void *context)
 362{
 363        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 364        struct mmp_tdma_desc *desc;
 365        int num_periods = buf_len / period_len;
 366        int i = 0, buf = 0;
 367
 368        if (tdmac->status != DMA_SUCCESS)
 369                return NULL;
 370
 371        if (period_len > TDMA_MAX_XFER_BYTES) {
 372                dev_err(tdmac->dev,
 373                                "maximum period size exceeded: %d > %d\n",
 374                                period_len, TDMA_MAX_XFER_BYTES);
 375                goto err_out;
 376        }
 377
 378        tdmac->status = DMA_IN_PROGRESS;
 379        tdmac->desc_num = num_periods;
 380        desc = mmp_tdma_alloc_descriptor(tdmac);
 381        if (!desc)
 382                goto err_out;
 383
 384        while (buf < buf_len) {
 385                desc = &tdmac->desc_arr[i];
 386
 387                if (i + 1 == num_periods)
 388                        desc->nxt_desc = tdmac->desc_arr_phys;
 389                else
 390                        desc->nxt_desc = tdmac->desc_arr_phys +
 391                                sizeof(*desc) * (i + 1);
 392
 393                if (direction == DMA_MEM_TO_DEV) {
 394                        desc->src_addr = dma_addr;
 395                        desc->dst_addr = tdmac->dev_addr;
 396                } else {
 397                        desc->src_addr = tdmac->dev_addr;
 398                        desc->dst_addr = dma_addr;
 399                }
 400                desc->byte_cnt = period_len;
 401                dma_addr += period_len;
 402                buf += period_len;
 403                i++;
 404        }
 405
 406        tdmac->buf_len = buf_len;
 407        tdmac->period_len = period_len;
 408        tdmac->pos = 0;
 409
 410        return &tdmac->desc;
 411
 412err_out:
 413        tdmac->status = DMA_ERROR;
 414        return NULL;
 415}
 416
 417static int mmp_tdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 418                unsigned long arg)
 419{
 420        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 421        struct dma_slave_config *dmaengine_cfg = (void *)arg;
 422        int ret = 0;
 423
 424        switch (cmd) {
 425        case DMA_TERMINATE_ALL:
 426                mmp_tdma_disable_chan(tdmac);
 427                break;
 428        case DMA_PAUSE:
 429                mmp_tdma_pause_chan(tdmac);
 430                break;
 431        case DMA_RESUME:
 432                mmp_tdma_resume_chan(tdmac);
 433                break;
 434        case DMA_SLAVE_CONFIG:
 435                if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
 436                        tdmac->dev_addr = dmaengine_cfg->src_addr;
 437                        tdmac->burst_sz = dmaengine_cfg->src_maxburst;
 438                        tdmac->buswidth = dmaengine_cfg->src_addr_width;
 439                } else {
 440                        tdmac->dev_addr = dmaengine_cfg->dst_addr;
 441                        tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
 442                        tdmac->buswidth = dmaengine_cfg->dst_addr_width;
 443                }
 444                tdmac->dir = dmaengine_cfg->direction;
 445                return mmp_tdma_config_chan(tdmac);
 446        default:
 447                ret = -ENOSYS;
 448        }
 449
 450        return ret;
 451}
 452
 453static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan,
 454                        dma_cookie_t cookie, struct dma_tx_state *txstate)
 455{
 456        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 457
 458        dma_set_residue(txstate, tdmac->buf_len - tdmac->pos);
 459
 460        return tdmac->status;
 461}
 462
 463static void mmp_tdma_issue_pending(struct dma_chan *chan)
 464{
 465        struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 466
 467        mmp_tdma_enable_chan(tdmac);
 468}
 469
 470static int __devexit mmp_tdma_remove(struct platform_device *pdev)
 471{
 472        struct mmp_tdma_device *tdev = platform_get_drvdata(pdev);
 473
 474        dma_async_device_unregister(&tdev->device);
 475        return 0;
 476}
 477
 478static int __devinit mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
 479                                                int idx, int irq, int type)
 480{
 481        struct mmp_tdma_chan *tdmac;
 482
 483        if (idx >= TDMA_CHANNEL_NUM) {
 484                dev_err(tdev->dev, "too many channels for device!\n");
 485                return -EINVAL;
 486        }
 487
 488        /* alloc channel */
 489        tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL);
 490        if (!tdmac) {
 491                dev_err(tdev->dev, "no free memory for DMA channels!\n");
 492                return -ENOMEM;
 493        }
 494        if (irq)
 495                tdmac->irq = irq;
 496        tdmac->dev         = tdev->dev;
 497        tdmac->chan.device = &tdev->device;
 498        tdmac->idx         = idx;
 499        tdmac->type        = type;
 500        tdmac->reg_base    = (unsigned long)tdev->base + idx * 4;
 501        tdmac->status = DMA_SUCCESS;
 502        tdev->tdmac[tdmac->idx] = tdmac;
 503        tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac);
 504
 505        /* add the channel to tdma_chan list */
 506        list_add_tail(&tdmac->chan.device_node,
 507                        &tdev->device.channels);
 508        return 0;
 509}
 510
 511static struct of_device_id mmp_tdma_dt_ids[] = {
 512        { .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
 513        { .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
 514        {}
 515};
 516MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids);
 517
 518static int __devinit mmp_tdma_probe(struct platform_device *pdev)
 519{
 520        enum mmp_tdma_type type;
 521        const struct of_device_id *of_id;
 522        struct mmp_tdma_device *tdev;
 523        struct resource *iores;
 524        int i, ret;
 525        int irq = 0, irq_num = 0;
 526        int chan_num = TDMA_CHANNEL_NUM;
 527
 528        of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
 529        if (of_id)
 530                type = (enum mmp_tdma_type) of_id->data;
 531        else
 532                type = platform_get_device_id(pdev)->driver_data;
 533
 534        /* always have couple channels */
 535        tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
 536        if (!tdev)
 537                return -ENOMEM;
 538
 539        tdev->dev = &pdev->dev;
 540
 541        for (i = 0; i < chan_num; i++) {
 542                if (platform_get_irq(pdev, i) > 0)
 543                        irq_num++;
 544        }
 545
 546        iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 547        if (!iores)
 548                return -EINVAL;
 549
 550        tdev->base = devm_request_and_ioremap(&pdev->dev, iores);
 551        if (!tdev->base)
 552                return -EADDRNOTAVAIL;
 553
 554        INIT_LIST_HEAD(&tdev->device.channels);
 555
 556        if (irq_num != chan_num) {
 557                irq = platform_get_irq(pdev, 0);
 558                ret = devm_request_irq(&pdev->dev, irq,
 559                        mmp_tdma_int_handler, IRQF_DISABLED, "tdma", tdev);
 560                if (ret)
 561                        return ret;
 562        }
 563
 564        /* initialize channel parameters */
 565        for (i = 0; i < chan_num; i++) {
 566                irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
 567                ret = mmp_tdma_chan_init(tdev, i, irq, type);
 568                if (ret)
 569                        return ret;
 570        }
 571
 572        dma_cap_set(DMA_SLAVE, tdev->device.cap_mask);
 573        dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask);
 574        tdev->device.dev = &pdev->dev;
 575        tdev->device.device_alloc_chan_resources =
 576                                        mmp_tdma_alloc_chan_resources;
 577        tdev->device.device_free_chan_resources =
 578                                        mmp_tdma_free_chan_resources;
 579        tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic;
 580        tdev->device.device_tx_status = mmp_tdma_tx_status;
 581        tdev->device.device_issue_pending = mmp_tdma_issue_pending;
 582        tdev->device.device_control = mmp_tdma_control;
 583        tdev->device.copy_align = TDMA_ALIGNMENT;
 584
 585        dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 586        platform_set_drvdata(pdev, tdev);
 587
 588        ret = dma_async_device_register(&tdev->device);
 589        if (ret) {
 590                dev_err(tdev->device.dev, "unable to register\n");
 591                return ret;
 592        }
 593
 594        dev_info(tdev->device.dev, "initialized\n");
 595        return 0;
 596}
 597
 598static const struct platform_device_id mmp_tdma_id_table[] = {
 599        { "mmp-adma",   MMP_AUD_TDMA },
 600        { "pxa910-squ", PXA910_SQU },
 601        { },
 602};
 603
 604static struct platform_driver mmp_tdma_driver = {
 605        .driver         = {
 606                .name   = "mmp-tdma",
 607                .owner  = THIS_MODULE,
 608                .of_match_table = mmp_tdma_dt_ids,
 609        },
 610        .id_table       = mmp_tdma_id_table,
 611        .probe          = mmp_tdma_probe,
 612        .remove         = __devexit_p(mmp_tdma_remove),
 613};
 614
 615module_platform_driver(mmp_tdma_driver);
 616
 617MODULE_LICENSE("GPL");
 618MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
 619MODULE_ALIAS("platform:mmp-tdma");
 620MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 621MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
 622
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