drivers/dma/dma-jz4780.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ingenic JZ4780 DMA controller
   4  *
   5  * Copyright (c) 2015 Imagination Technologies
   6  * Author: Alex Smith <alex@alex-smith.me.uk>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_dma.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include "dmaengine.h"
  22 #include "virt-dma.h"
  23
  24 /* Global registers. */
  25 #define JZ_DMA_REG_DMAC         0x00
  26 #define JZ_DMA_REG_DIRQP        0x04
  27 #define JZ_DMA_REG_DDR          0x08
  28 #define JZ_DMA_REG_DDRS         0x0c
  29 #define JZ_DMA_REG_DCKE         0x10
  30 #define JZ_DMA_REG_DCKES        0x14
  31 #define JZ_DMA_REG_DCKEC        0x18
  32 #define JZ_DMA_REG_DMACP        0x1c
  33 #define JZ_DMA_REG_DSIRQP       0x20
  34 #define JZ_DMA_REG_DSIRQM       0x24
  35 #define JZ_DMA_REG_DCIRQP       0x28
  36 #define JZ_DMA_REG_DCIRQM       0x2c
  37
  38 /* Per-channel registers. */
  39 #define JZ_DMA_REG_CHAN(n)      (n * 0x20)
  40 #define JZ_DMA_REG_DSA          0x00
  41 #define JZ_DMA_REG_DTA          0x04
  42 #define JZ_DMA_REG_DTC          0x08
  43 #define JZ_DMA_REG_DRT          0x0c
  44 #define JZ_DMA_REG_DCS          0x10
  45 #define JZ_DMA_REG_DCM          0x14
  46 #define JZ_DMA_REG_DDA          0x18
  47 #define JZ_DMA_REG_DSD          0x1c
  48
  49 #define JZ_DMA_DMAC_DMAE        BIT(0)
  50 #define JZ_DMA_DMAC_AR          BIT(2)
  51 #define JZ_DMA_DMAC_HLT         BIT(3)
  52 #define JZ_DMA_DMAC_FAIC        BIT(27)
  53 #define JZ_DMA_DMAC_FMSC        BIT(31)
  54
  55 #define JZ_DMA_DRT_AUTO         0x8
  56
  57 #define JZ_DMA_DCS_CTE          BIT(0)
  58 #define JZ_DMA_DCS_HLT          BIT(2)
  59 #define JZ_DMA_DCS_TT           BIT(3)
  60 #define JZ_DMA_DCS_AR           BIT(4)
  61 #define JZ_DMA_DCS_DES8         BIT(30)
  62
  63 #define JZ_DMA_DCM_LINK         BIT(0)
  64 #define JZ_DMA_DCM_TIE          BIT(1)
  65 #define JZ_DMA_DCM_STDE         BIT(2)
  66 #define JZ_DMA_DCM_TSZ_SHIFT    8
  67 #define JZ_DMA_DCM_TSZ_MASK     (0x7 << JZ_DMA_DCM_TSZ_SHIFT)
  68 #define JZ_DMA_DCM_DP_SHIFT     12
  69 #define JZ_DMA_DCM_SP_SHIFT     14
  70 #define JZ_DMA_DCM_DAI          BIT(22)
  71 #define JZ_DMA_DCM_SAI          BIT(23)
  72
  73 #define JZ_DMA_SIZE_4_BYTE      0x0
  74 #define JZ_DMA_SIZE_1_BYTE      0x1
  75 #define JZ_DMA_SIZE_2_BYTE      0x2
  76 #define JZ_DMA_SIZE_16_BYTE     0x3
  77 #define JZ_DMA_SIZE_32_BYTE     0x4
  78 #define JZ_DMA_SIZE_64_BYTE     0x5
  79 #define JZ_DMA_SIZE_128_BYTE    0x6
  80
  81 #define JZ_DMA_WIDTH_32_BIT     0x0
  82 #define JZ_DMA_WIDTH_8_BIT      0x1
  83 #define JZ_DMA_WIDTH_16_BIT     0x2
  84
  85 #define JZ_DMA_BUSWIDTHS        (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE)  | \
  86                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
  87                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
  88
  89 #define JZ4780_DMA_CTRL_OFFSET  0x1000
  90
  91 /* macros for use with jz4780_dma_soc_data.flags */
  92 #define JZ_SOC_DATA_ALLOW_LEGACY_DT     BIT(0)
  93 #define JZ_SOC_DATA_PROGRAMMABLE_DMA    BIT(1)
  94 #define JZ_SOC_DATA_PER_CHAN_PM         BIT(2)
  95 #define JZ_SOC_DATA_NO_DCKES_DCKEC      BIT(3)
  96 #define JZ_SOC_DATA_BREAK_LINKS         BIT(4)
  97
  98 /**
  99  * struct jz4780_dma_hwdesc - descriptor structure read by the DMA controller.
 100  * @dcm: value for the DCM (channel command) register
 101  * @dsa: source address
 102  * @dta: target address
 103  * @dtc: transfer count (number of blocks of the transfer size specified in DCM
 104  * to transfer) in the low 24 bits, offset of the next descriptor from the
 105  * descriptor base address in the upper 8 bits.
 106  */
 107 struct jz4780_dma_hwdesc {
 108         u32 dcm;
 109         u32 dsa;
 110         u32 dta;
 111         u32 dtc;
 112 };
 113
 114 /* Size of allocations for hardware descriptor blocks. */
 115 #define JZ_DMA_DESC_BLOCK_SIZE  PAGE_SIZE
 116 #define JZ_DMA_MAX_DESC         \
 117         (JZ_DMA_DESC_BLOCK_SIZE / sizeof(struct jz4780_dma_hwdesc))
 118
 119 struct jz4780_dma_desc {
 120         struct virt_dma_desc vdesc;
 121
 122         struct jz4780_dma_hwdesc *desc;
 123         dma_addr_t desc_phys;
 124         unsigned int count;
 125         enum dma_transaction_type type;
 126         u32 transfer_type;
 127         u32 status;
 128 };
 129
 130 struct jz4780_dma_chan {
 131         struct virt_dma_chan vchan;
 132         unsigned int id;
 133         struct dma_pool *desc_pool;
 134
 135         u32 transfer_type_tx, transfer_type_rx;
 136         u32 transfer_shift;
 137         struct dma_slave_config config;
 138
 139         struct jz4780_dma_desc *desc;
 140         unsigned int curr_hwdesc;
 141 };
 142
 143 struct jz4780_dma_soc_data {
 144         unsigned int nb_channels;
 145         unsigned int transfer_ord_max;
 146         unsigned long flags;
 147 };
 148
 149 struct jz4780_dma_dev {
 150         struct dma_device dma_device;
 151         void __iomem *chn_base;
 152         void __iomem *ctrl_base;
 153         struct clk *clk;
 154         unsigned int irq;
 155         const struct jz4780_dma_soc_data *soc_data;
 156
 157         u32 chan_reserved;
 158         struct jz4780_dma_chan chan[];
 159 };
 160
 161 struct jz4780_dma_filter_data {
 162         u32 transfer_type_tx, transfer_type_rx;
 163         int channel;
 164 };
 165
 166 static inline struct jz4780_dma_chan *to_jz4780_dma_chan(struct dma_chan *chan)
 167 {
 168         return container_of(chan, struct jz4780_dma_chan, vchan.chan);
 169 }
 170
 171 static inline struct jz4780_dma_desc *to_jz4780_dma_desc(
 172         struct virt_dma_desc *vdesc)
 173 {
 174         return container_of(vdesc, struct jz4780_dma_desc, vdesc);
 175 }
 176
 177 static inline struct jz4780_dma_dev *jz4780_dma_chan_parent(
 178         struct jz4780_dma_chan *jzchan)
 179 {
 180         return container_of(jzchan->vchan.chan.device, struct jz4780_dma_dev,
 181                             dma_device);
 182 }
 183
 184 static inline u32 jz4780_dma_chn_readl(struct jz4780_dma_dev *jzdma,
 185         unsigned int chn, unsigned int reg)
 186 {
 187         return readl(jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
 188 }
 189
 190 static inline void jz4780_dma_chn_writel(struct jz4780_dma_dev *jzdma,
 191         unsigned int chn, unsigned int reg, u32 val)
 192 {
 193         writel(val, jzdma->chn_base + reg + JZ_DMA_REG_CHAN(chn));
 194 }
 195
 196 static inline u32 jz4780_dma_ctrl_readl(struct jz4780_dma_dev *jzdma,
 197         unsigned int reg)
 198 {
 199         return readl(jzdma->ctrl_base + reg);
 200 }
 201
 202 static inline void jz4780_dma_ctrl_writel(struct jz4780_dma_dev *jzdma,
 203         unsigned int reg, u32 val)
 204 {
 205         writel(val, jzdma->ctrl_base + reg);
 206 }
 207
 208 static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
 209         unsigned int chn)
 210 {
 211         if (jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) {
 212                 unsigned int reg;
 213
 214                 if (jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC)
 215                         reg = JZ_DMA_REG_DCKE;
 216                 else
 217                         reg = JZ_DMA_REG_DCKES;
 218
 219                 jz4780_dma_ctrl_writel(jzdma, reg, BIT(chn));
 220         }
 221 }
 222
 223 static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev *jzdma,
 224         unsigned int chn)
 225 {
 226         if ((jzdma->soc_data->flags & JZ_SOC_DATA_PER_CHAN_PM) &&
 227                         !(jzdma->soc_data->flags & JZ_SOC_DATA_NO_DCKES_DCKEC))
 228                 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
 229 }
 230
 231 static struct jz4780_dma_desc *
 232 jz4780_dma_desc_alloc(struct jz4780_dma_chan *jzchan, unsigned int count,
 233                       enum dma_transaction_type type,
 234                       enum dma_transfer_direction direction)
 235 {
 236         struct jz4780_dma_desc *desc;
 237
 238         if (count > JZ_DMA_MAX_DESC)
 239                 return NULL;
 240
 241         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 242         if (!desc)
 243                 return NULL;
 244
 245         desc->desc = dma_pool_alloc(jzchan->desc_pool, GFP_NOWAIT,
 246                                     &desc->desc_phys);
 247         if (!desc->desc) {
 248                 kfree(desc);
 249                 return NULL;
 250         }
 251
 252         desc->count = count;
 253         desc->type = type;
 254
 255         if (direction == DMA_DEV_TO_MEM)
 256                 desc->transfer_type = jzchan->transfer_type_rx;
 257         else
 258                 desc->transfer_type = jzchan->transfer_type_tx;
 259
 260         return desc;
 261 }
 262
 263 static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc)
 264 {
 265         struct jz4780_dma_desc *desc = to_jz4780_dma_desc(vdesc);
 266         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(vdesc->tx.chan);
 267
 268         dma_pool_free(jzchan->desc_pool, desc->desc, desc->desc_phys);
 269         kfree(desc);
 270 }
 271
 272 static u32 jz4780_dma_transfer_size(struct jz4780_dma_chan *jzchan,
 273         unsigned long val, u32 *shift)
 274 {
 275         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 276         int ord = ffs(val) - 1;
 277
 278         /*
 279          * 8 byte transfer sizes unsupported so fall back on 4. If it's larger
 280          * than the maximum, just limit it. It is perfectly safe to fall back
 281          * in this way since we won't exceed the maximum burst size supported
 282          * by the device, the only effect is reduced efficiency. This is better
 283          * than refusing to perform the request at all.
 284          */
 285         if (ord == 3)
 286                 ord = 2;
 287         else if (ord > jzdma->soc_data->transfer_ord_max)
 288                 ord = jzdma->soc_data->transfer_ord_max;
 289
 290         *shift = ord;
 291
 292         switch (ord) {
 293         case 0:
 294                 return JZ_DMA_SIZE_1_BYTE;
 295         case 1:
 296                 return JZ_DMA_SIZE_2_BYTE;
 297         case 2:
 298                 return JZ_DMA_SIZE_4_BYTE;
 299         case 4:
 300                 return JZ_DMA_SIZE_16_BYTE;
 301         case 5:
 302                 return JZ_DMA_SIZE_32_BYTE;
 303         case 6:
 304                 return JZ_DMA_SIZE_64_BYTE;
 305         default:
 306                 return JZ_DMA_SIZE_128_BYTE;
 307         }
 308 }
 309
 310 static int jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan,
 311         struct jz4780_dma_hwdesc *desc, dma_addr_t addr, size_t len,
 312         enum dma_transfer_direction direction)
 313 {
 314         struct dma_slave_config *config = &jzchan->config;
 315         u32 width, maxburst, tsz;
 316
 317         if (direction == DMA_MEM_TO_DEV) {
 318                 desc->dcm = JZ_DMA_DCM_SAI;
 319                 desc->dsa = addr;
 320                 desc->dta = config->dst_addr;
 321
 322                 width = config->dst_addr_width;
 323                 maxburst = config->dst_maxburst;
 324         } else {
 325                 desc->dcm = JZ_DMA_DCM_DAI;
 326                 desc->dsa = config->src_addr;
 327                 desc->dta = addr;
 328
 329                 width = config->src_addr_width;
 330                 maxburst = config->src_maxburst;
 331         }
 332
 333         /*
 334          * This calculates the maximum transfer size that can be used with the
 335          * given address, length, width and maximum burst size. The address
 336          * must be aligned to the transfer size, the total length must be
 337          * divisible by the transfer size, and we must not use more than the
 338          * maximum burst specified by the user.
 339          */
 340         tsz = jz4780_dma_transfer_size(jzchan, addr | len | (width * maxburst),
 341                                        &jzchan->transfer_shift);
 342
 343         switch (width) {
 344         case DMA_SLAVE_BUSWIDTH_1_BYTE:
 345         case DMA_SLAVE_BUSWIDTH_2_BYTES:
 346                 break;
 347         case DMA_SLAVE_BUSWIDTH_4_BYTES:
 348                 width = JZ_DMA_WIDTH_32_BIT;
 349                 break;
 350         default:
 351                 return -EINVAL;
 352         }
 353
 354         desc->dcm |= tsz << JZ_DMA_DCM_TSZ_SHIFT;
 355         desc->dcm |= width << JZ_DMA_DCM_SP_SHIFT;
 356         desc->dcm |= width << JZ_DMA_DCM_DP_SHIFT;
 357
 358         desc->dtc = len >> jzchan->transfer_shift;
 359         return 0;
 360 }
 361
 362 static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg(
 363         struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
 364         enum dma_transfer_direction direction, unsigned long flags,
 365         void *context)
 366 {
 367         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 368         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 369         struct jz4780_dma_desc *desc;
 370         unsigned int i;
 371         int err;
 372
 373         desc = jz4780_dma_desc_alloc(jzchan, sg_len, DMA_SLAVE, direction);
 374         if (!desc)
 375                 return NULL;
 376
 377         for (i = 0; i < sg_len; i++) {
 378                 err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i],
 379                                               sg_dma_address(&sgl[i]),
 380                                               sg_dma_len(&sgl[i]),
 381                                               direction);
 382                 if (err < 0) {
 383                         jz4780_dma_desc_free(&jzchan->desc->vdesc);
 384                         return NULL;
 385                 }
 386
 387                 desc->desc[i].dcm |= JZ_DMA_DCM_TIE;
 388
 389                 if (i != (sg_len - 1) &&
 390                     !(jzdma->soc_data->flags & JZ_SOC_DATA_BREAK_LINKS)) {
 391                         /* Automatically proceeed to the next descriptor. */
 392                         desc->desc[i].dcm |= JZ_DMA_DCM_LINK;
 393
 394                         /*
 395                          * The upper 8 bits of the DTC field in the descriptor
 396                          * must be set to (offset from descriptor base of next
 397                          * descriptor >> 4).
 398                          */
 399                         desc->desc[i].dtc |=
 400                                 (((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
 401                 }
 402         }
 403
 404         return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
 405 }
 406
 407 static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic(
 408         struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
 409         size_t period_len, enum dma_transfer_direction direction,
 410         unsigned long flags)
 411 {
 412         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 413         struct jz4780_dma_desc *desc;
 414         unsigned int periods, i;
 415         int err;
 416
 417         if (buf_len % period_len)
 418                 return NULL;
 419
 420         periods = buf_len / period_len;
 421
 422         desc = jz4780_dma_desc_alloc(jzchan, periods, DMA_CYCLIC, direction);
 423         if (!desc)
 424                 return NULL;
 425
 426         for (i = 0; i < periods; i++) {
 427                 err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr,
 428                                               period_len, direction);
 429                 if (err < 0) {
 430                         jz4780_dma_desc_free(&jzchan->desc->vdesc);
 431                         return NULL;
 432                 }
 433
 434                 buf_addr += period_len;
 435
 436                 /*
 437                  * Set the link bit to indicate that the controller should
 438                  * automatically proceed to the next descriptor. In
 439                  * jz4780_dma_begin(), this will be cleared if we need to issue
 440                  * an interrupt after each period.
 441                  */
 442                 desc->desc[i].dcm |= JZ_DMA_DCM_TIE | JZ_DMA_DCM_LINK;
 443
 444                 /*
 445                  * The upper 8 bits of the DTC field in the descriptor must be
 446                  * set to (offset from descriptor base of next descriptor >> 4).
 447                  * If this is the last descriptor, link it back to the first,
 448                  * i.e. leave offset set to 0, otherwise point to the next one.
 449                  */
 450                 if (i != (periods - 1)) {
 451                         desc->desc[i].dtc |=
 452                                 (((i + 1) * sizeof(*desc->desc)) >> 4) << 24;
 453                 }
 454         }
 455
 456         return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
 457 }
 458
 459 static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy(
 460         struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 461         size_t len, unsigned long flags)
 462 {
 463         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 464         struct jz4780_dma_desc *desc;
 465         u32 tsz;
 466
 467         desc = jz4780_dma_desc_alloc(jzchan, 1, DMA_MEMCPY, 0);
 468         if (!desc)
 469                 return NULL;
 470
 471         tsz = jz4780_dma_transfer_size(jzchan, dest | src | len,
 472                                        &jzchan->transfer_shift);
 473
 474         desc->transfer_type = JZ_DMA_DRT_AUTO;
 475
 476         desc->desc[0].dsa = src;
 477         desc->desc[0].dta = dest;
 478         desc->desc[0].dcm = JZ_DMA_DCM_TIE | JZ_DMA_DCM_SAI | JZ_DMA_DCM_DAI |
 479                             tsz << JZ_DMA_DCM_TSZ_SHIFT |
 480                             JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_SP_SHIFT |
 481                             JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_DP_SHIFT;
 482         desc->desc[0].dtc = len >> jzchan->transfer_shift;
 483
 484         return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags);
 485 }
 486
 487 static void jz4780_dma_begin(struct jz4780_dma_chan *jzchan)
 488 {
 489         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 490         struct virt_dma_desc *vdesc;
 491         unsigned int i;
 492         dma_addr_t desc_phys;
 493
 494         if (!jzchan->desc) {
 495                 vdesc = vchan_next_desc(&jzchan->vchan);
 496                 if (!vdesc)
 497                         return;
 498
 499                 list_del(&vdesc->node);
 500
 501                 jzchan->desc = to_jz4780_dma_desc(vdesc);
 502                 jzchan->curr_hwdesc = 0;
 503
 504                 if (jzchan->desc->type == DMA_CYCLIC && vdesc->tx.callback) {
 505                         /*
 506                          * The DMA controller doesn't support triggering an
 507                          * interrupt after processing each descriptor, only
 508                          * after processing an entire terminated list of
 509                          * descriptors. For a cyclic DMA setup the list of
 510                          * descriptors is not terminated so we can never get an
 511                          * interrupt.
 512                          *
 513                          * If the user requested a callback for a cyclic DMA
 514                          * setup then we workaround this hardware limitation
 515                          * here by degrading to a set of unlinked descriptors
 516                          * which we will submit in sequence in response to the
 517                          * completion of processing the previous descriptor.
 518                          */
 519                         for (i = 0; i < jzchan->desc->count; i++)
 520                                 jzchan->desc->desc[i].dcm &= ~JZ_DMA_DCM_LINK;
 521                 }
 522         } else {
 523                 /*
 524                  * There is an existing transfer, therefore this must be one
 525                  * for which we unlinked the descriptors above. Advance to the
 526                  * next one in the list.
 527                  */
 528                 jzchan->curr_hwdesc =
 529                         (jzchan->curr_hwdesc + 1) % jzchan->desc->count;
 530         }
 531
 532         /* Enable the channel's clock. */
 533         jz4780_dma_chan_enable(jzdma, jzchan->id);
 534
 535         /* Use 4-word descriptors. */
 536         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
 537
 538         /* Set transfer type. */
 539         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DRT,
 540                               jzchan->desc->transfer_type);
 541
 542         /*
 543          * Set the transfer count. This is redundant for a descriptor-driven
 544          * transfer. However, there can be a delay between the transfer start
 545          * time and when DTCn reg contains the new transfer count. Setting
 546          * it explicitly ensures residue is computed correctly at all times.
 547          */
 548         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DTC,
 549                                 jzchan->desc->desc[jzchan->curr_hwdesc].dtc);
 550
 551         /* Write descriptor address and initiate descriptor fetch. */
 552         desc_phys = jzchan->desc->desc_phys +
 553                     (jzchan->curr_hwdesc * sizeof(*jzchan->desc->desc));
 554         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DDA, desc_phys);
 555         jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DDRS, BIT(jzchan->id));
 556
 557         /* Enable the channel. */
 558         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS,
 559                               JZ_DMA_DCS_CTE);
 560 }
 561
 562 static void jz4780_dma_issue_pending(struct dma_chan *chan)
 563 {
 564         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 565         unsigned long flags;
 566
 567         spin_lock_irqsave(&jzchan->vchan.lock, flags);
 568
 569         if (vchan_issue_pending(&jzchan->vchan) && !jzchan->desc)
 570                 jz4780_dma_begin(jzchan);
 571
 572         spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
 573 }
 574
 575 static int jz4780_dma_terminate_all(struct dma_chan *chan)
 576 {
 577         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 578         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 579         unsigned long flags;
 580         LIST_HEAD(head);
 581
 582         spin_lock_irqsave(&jzchan->vchan.lock, flags);
 583
 584         /* Clear the DMA status and stop the transfer. */
 585         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
 586         if (jzchan->desc) {
 587                 vchan_terminate_vdesc(&jzchan->desc->vdesc);
 588                 jzchan->desc = NULL;
 589         }
 590
 591         jz4780_dma_chan_disable(jzdma, jzchan->id);
 592
 593         vchan_get_all_descriptors(&jzchan->vchan, &head);
 594
 595         spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
 596
 597         vchan_dma_desc_free_list(&jzchan->vchan, &head);
 598         return 0;
 599 }
 600
 601 static void jz4780_dma_synchronize(struct dma_chan *chan)
 602 {
 603         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 604         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 605
 606         vchan_synchronize(&jzchan->vchan);
 607         jz4780_dma_chan_disable(jzdma, jzchan->id);
 608 }
 609
 610 static int jz4780_dma_config(struct dma_chan *chan,
 611         struct dma_slave_config *config)
 612 {
 613         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 614
 615         if ((config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
 616            || (config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES))
 617                 return -EINVAL;
 618
 619         /* Copy the reset of the slave configuration, it is used later. */
 620         memcpy(&jzchan->config, config, sizeof(jzchan->config));
 621
 622         return 0;
 623 }
 624
 625 static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan,
 626         struct jz4780_dma_desc *desc, unsigned int next_sg)
 627 {
 628         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 629         unsigned int count = 0;
 630         unsigned int i;
 631
 632         for (i = next_sg; i < desc->count; i++)
 633                 count += desc->desc[i].dtc & GENMASK(23, 0);
 634
 635         if (next_sg != 0)
 636                 count += jz4780_dma_chn_readl(jzdma, jzchan->id,
 637                                          JZ_DMA_REG_DTC);
 638
 639         return count << jzchan->transfer_shift;
 640 }
 641
 642 static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan,
 643         dma_cookie_t cookie, struct dma_tx_state *txstate)
 644 {
 645         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 646         struct virt_dma_desc *vdesc;
 647         enum dma_status status;
 648         unsigned long flags;
 649         unsigned long residue = 0;
 650
 651         spin_lock_irqsave(&jzchan->vchan.lock, flags);
 652
 653         status = dma_cookie_status(chan, cookie, txstate);
 654         if ((status == DMA_COMPLETE) || (txstate == NULL))
 655                 goto out_unlock_irqrestore;
 656
 657         vdesc = vchan_find_desc(&jzchan->vchan, cookie);
 658         if (vdesc) {
 659                 /* On the issued list, so hasn't been processed yet */
 660                 residue = jz4780_dma_desc_residue(jzchan,
 661                                         to_jz4780_dma_desc(vdesc), 0);
 662         } else if (cookie == jzchan->desc->vdesc.tx.cookie) {
 663                 residue = jz4780_dma_desc_residue(jzchan, jzchan->desc,
 664                                         jzchan->curr_hwdesc + 1);
 665         }
 666         dma_set_residue(txstate, residue);
 667
 668         if (vdesc && jzchan->desc && vdesc == &jzchan->desc->vdesc
 669             && jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT))
 670                 status = DMA_ERROR;
 671
 672 out_unlock_irqrestore:
 673         spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
 674         return status;
 675 }
 676
 677 static bool jz4780_dma_chan_irq(struct jz4780_dma_dev *jzdma,
 678                                 struct jz4780_dma_chan *jzchan)
 679 {
 680         const unsigned int soc_flags = jzdma->soc_data->flags;
 681         struct jz4780_dma_desc *desc = jzchan->desc;
 682         u32 dcs;
 683         bool ack = true;
 684
 685         spin_lock(&jzchan->vchan.lock);
 686
 687         dcs = jz4780_dma_chn_readl(jzdma, jzchan->id, JZ_DMA_REG_DCS);
 688         jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
 689
 690         if (dcs & JZ_DMA_DCS_AR) {
 691                 dev_warn(&jzchan->vchan.chan.dev->device,
 692                          "address error (DCS=0x%x)\n", dcs);
 693         }
 694
 695         if (dcs & JZ_DMA_DCS_HLT) {
 696                 dev_warn(&jzchan->vchan.chan.dev->device,
 697                          "channel halt (DCS=0x%x)\n", dcs);
 698         }
 699
 700         if (jzchan->desc) {
 701                 jzchan->desc->status = dcs;
 702
 703                 if ((dcs & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) == 0) {
 704                         if (jzchan->desc->type == DMA_CYCLIC) {
 705                                 vchan_cyclic_callback(&jzchan->desc->vdesc);
 706
 707                                 jz4780_dma_begin(jzchan);
 708                         } else if (dcs & JZ_DMA_DCS_TT) {
 709                                 if (!(soc_flags & JZ_SOC_DATA_BREAK_LINKS) ||
 710                                     (jzchan->curr_hwdesc + 1 == desc->count)) {
 711                                         vchan_cookie_complete(&desc->vdesc);
 712                                         jzchan->desc = NULL;
 713                                 }
 714
 715                                 jz4780_dma_begin(jzchan);
 716                         } else {
 717                                 /* False positive - continue the transfer */
 718                                 ack = false;
 719                                 jz4780_dma_chn_writel(jzdma, jzchan->id,
 720                                                       JZ_DMA_REG_DCS,
 721                                                       JZ_DMA_DCS_CTE);
 722                         }
 723                 }
 724         } else {
 725                 dev_err(&jzchan->vchan.chan.dev->device,
 726                         "channel IRQ with no active transfer\n");
 727         }
 728
 729         spin_unlock(&jzchan->vchan.lock);
 730
 731         return ack;
 732 }
 733
 734 static irqreturn_t jz4780_dma_irq_handler(int irq, void *data)
 735 {
 736         struct jz4780_dma_dev *jzdma = data;
 737         unsigned int nb_channels = jzdma->soc_data->nb_channels;
 738         unsigned long pending;
 739         u32 dmac;
 740         int i;
 741
 742         pending = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DIRQP);
 743
 744         for_each_set_bit(i, &pending, nb_channels) {
 745                 if (jz4780_dma_chan_irq(jzdma, &jzdma->chan[i]))
 746                         pending &= ~BIT(i);
 747         }
 748
 749         /* Clear halt and address error status of all channels. */
 750         dmac = jz4780_dma_ctrl_readl(jzdma, JZ_DMA_REG_DMAC);
 751         dmac &= ~(JZ_DMA_DMAC_HLT | JZ_DMA_DMAC_AR);
 752         jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, dmac);
 753
 754         /* Clear interrupt pending status. */
 755         jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DIRQP, pending);
 756
 757         return IRQ_HANDLED;
 758 }
 759
 760 static int jz4780_dma_alloc_chan_resources(struct dma_chan *chan)
 761 {
 762         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 763
 764         jzchan->desc_pool = dma_pool_create(dev_name(&chan->dev->device),
 765                                             chan->device->dev,
 766                                             JZ_DMA_DESC_BLOCK_SIZE,
 767                                             PAGE_SIZE, 0);
 768         if (!jzchan->desc_pool) {
 769                 dev_err(&chan->dev->device,
 770                         "failed to allocate descriptor pool\n");
 771                 return -ENOMEM;
 772         }
 773
 774         return 0;
 775 }
 776
 777 static void jz4780_dma_free_chan_resources(struct dma_chan *chan)
 778 {
 779         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 780
 781         vchan_free_chan_resources(&jzchan->vchan);
 782         dma_pool_destroy(jzchan->desc_pool);
 783         jzchan->desc_pool = NULL;
 784 }
 785
 786 static bool jz4780_dma_filter_fn(struct dma_chan *chan, void *param)
 787 {
 788         struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
 789         struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
 790         struct jz4780_dma_filter_data *data = param;
 791
 792
 793         if (data->channel > -1) {
 794                 if (data->channel != jzchan->id)
 795                         return false;
 796         } else if (jzdma->chan_reserved & BIT(jzchan->id)) {
 797                 return false;
 798         }
 799
 800         jzchan->transfer_type_tx = data->transfer_type_tx;
 801         jzchan->transfer_type_rx = data->transfer_type_rx;
 802
 803         return true;
 804 }
 805
 806 static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
 807         struct of_dma *ofdma)
 808 {
 809         struct jz4780_dma_dev *jzdma = ofdma->of_dma_data;
 810         dma_cap_mask_t mask = jzdma->dma_device.cap_mask;
 811         struct jz4780_dma_filter_data data;
 812
 813         if (dma_spec->args_count == 2) {
 814                 data.transfer_type_tx = dma_spec->args[0];
 815                 data.transfer_type_rx = dma_spec->args[0];
 816                 data.channel = dma_spec->args[1];
 817         } else if (dma_spec->args_count == 3) {
 818                 data.transfer_type_tx = dma_spec->args[0];
 819                 data.transfer_type_rx = dma_spec->args[1];
 820                 data.channel = dma_spec->args[2];
 821         } else {
 822                 return NULL;
 823         }
 824
 825         if (data.channel > -1) {
 826                 if (data.channel >= jzdma->soc_data->nb_channels) {
 827                         dev_err(jzdma->dma_device.dev,
 828                                 "device requested non-existent channel %u\n",
 829                                 data.channel);
 830                         return NULL;
 831                 }
 832
 833                 /* Can only select a channel marked as reserved. */
 834                 if (!(jzdma->chan_reserved & BIT(data.channel))) {
 835                         dev_err(jzdma->dma_device.dev,
 836                                 "device requested unreserved channel %u\n",
 837                                 data.channel);
 838                         return NULL;
 839                 }
 840
 841                 jzdma->chan[data.channel].transfer_type_tx = data.transfer_type_tx;
 842                 jzdma->chan[data.channel].transfer_type_rx = data.transfer_type_rx;
 843
 844                 return dma_get_slave_channel(
 845                         &jzdma->chan[data.channel].vchan.chan);
 846         } else {
 847                 return __dma_request_channel(&mask, jz4780_dma_filter_fn, &data,
 848                                              ofdma->of_node);
 849         }
 850 }
 851
 852 static int jz4780_dma_probe(struct platform_device *pdev)
 853 {
 854         struct device *dev = &pdev->dev;
 855         const struct jz4780_dma_soc_data *soc_data;
 856         struct jz4780_dma_dev *jzdma;
 857         struct jz4780_dma_chan *jzchan;
 858         struct dma_device *dd;
 859         struct resource *res;
 860         int i, ret;
 861
 862         if (!dev->of_node) {
 863                 dev_err(dev, "This driver must be probed from devicetree\n");
 864                 return -EINVAL;
 865         }
 866
 867         soc_data = device_get_match_data(dev);
 868         if (!soc_data)
 869                 return -EINVAL;
 870
 871         jzdma = devm_kzalloc(dev, struct_size(jzdma, chan,
 872                              soc_data->nb_channels), GFP_KERNEL);
 873         if (!jzdma)
 874                 return -ENOMEM;
 875
 876         jzdma->soc_data = soc_data;
 877         platform_set_drvdata(pdev, jzdma);
 878
 879         jzdma->chn_base = devm_platform_ioremap_resource(pdev, 0);
 880         if (IS_ERR(jzdma->chn_base))
 881                 return PTR_ERR(jzdma->chn_base);
 882
 883         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 884         if (res) {
 885                 jzdma->ctrl_base = devm_ioremap_resource(dev, res);
 886                 if (IS_ERR(jzdma->ctrl_base))
 887                         return PTR_ERR(jzdma->ctrl_base);
 888         } else if (soc_data->flags & JZ_SOC_DATA_ALLOW_LEGACY_DT) {
 889                 /*
 890                  * On JZ4780, if the second memory resource was not supplied,
 891                  * assume we're using an old devicetree, and calculate the
 892                  * offset to the control registers.
 893                  */
 894                 jzdma->ctrl_base = jzdma->chn_base + JZ4780_DMA_CTRL_OFFSET;
 895         } else {
 896                 dev_err(dev, "failed to get I/O memory\n");
 897                 return -EINVAL;
 898         }
 899
 900         jzdma->clk = devm_clk_get(dev, NULL);
 901         if (IS_ERR(jzdma->clk)) {
 902                 dev_err(dev, "failed to get clock\n");
 903                 ret = PTR_ERR(jzdma->clk);
 904                 return ret;
 905         }
 906
 907         clk_prepare_enable(jzdma->clk);
 908
 909         /* Property is optional, if it doesn't exist the value will remain 0. */
 910         of_property_read_u32_index(dev->of_node, "ingenic,reserved-channels",
 911                                    0, &jzdma->chan_reserved);
 912
 913         dd = &jzdma->dma_device;
 914
 915         /*
 916          * The real segment size limit is dependent on the size unit selected
 917          * for the transfer. Because the size unit is selected automatically
 918          * and may be as small as 1 byte, use a safe limit of 2^24-1 bytes to
 919          * ensure the 24-bit transfer count in the descriptor cannot overflow.
 920          */
 921         dma_set_max_seg_size(dev, 0xffffff);
 922
 923         dma_cap_set(DMA_MEMCPY, dd->cap_mask);
 924         dma_cap_set(DMA_SLAVE, dd->cap_mask);
 925         dma_cap_set(DMA_CYCLIC, dd->cap_mask);
 926
 927         dd->dev = dev;
 928         dd->copy_align = DMAENGINE_ALIGN_4_BYTES;
 929         dd->device_alloc_chan_resources = jz4780_dma_alloc_chan_resources;
 930         dd->device_free_chan_resources = jz4780_dma_free_chan_resources;
 931         dd->device_prep_slave_sg = jz4780_dma_prep_slave_sg;
 932         dd->device_prep_dma_cyclic = jz4780_dma_prep_dma_cyclic;
 933         dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy;
 934         dd->device_config = jz4780_dma_config;
 935         dd->device_terminate_all = jz4780_dma_terminate_all;
 936         dd->device_synchronize = jz4780_dma_synchronize;
 937         dd->device_tx_status = jz4780_dma_tx_status;
 938         dd->device_issue_pending = jz4780_dma_issue_pending;
 939         dd->src_addr_widths = JZ_DMA_BUSWIDTHS;
 940         dd->dst_addr_widths = JZ_DMA_BUSWIDTHS;
 941         dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 942         dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 943         dd->max_sg_burst = JZ_DMA_MAX_DESC;
 944
 945         /*
 946          * Enable DMA controller, mark all channels as not programmable.
 947          * Also set the FMSC bit - it increases MSC performance, so it makes
 948          * little sense not to enable it.
 949          */
 950         jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC, JZ_DMA_DMAC_DMAE |
 951                                JZ_DMA_DMAC_FAIC | JZ_DMA_DMAC_FMSC);
 952
 953         if (soc_data->flags & JZ_SOC_DATA_PROGRAMMABLE_DMA)
 954                 jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMACP, 0);
 955
 956         INIT_LIST_HEAD(&dd->channels);
 957
 958         for (i = 0; i < soc_data->nb_channels; i++) {
 959                 jzchan = &jzdma->chan[i];
 960                 jzchan->id = i;
 961
 962                 vchan_init(&jzchan->vchan, dd);
 963                 jzchan->vchan.desc_free = jz4780_dma_desc_free;
 964         }
 965
 966         /*
 967          * On JZ4760, chan0 won't enable properly the first time.
 968          * Enabling then disabling chan1 will magically make chan0 work
 969          * correctly.
 970          */
 971         jz4780_dma_chan_enable(jzdma, 1);
 972         jz4780_dma_chan_disable(jzdma, 1);
 973
 974         ret = platform_get_irq(pdev, 0);
 975         if (ret < 0)
 976                 goto err_disable_clk;
 977
 978         jzdma->irq = ret;
 979
 980         ret = request_irq(jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev),
 981                           jzdma);
 982         if (ret) {
 983                 dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq);
 984                 goto err_disable_clk;
 985         }
 986
 987         ret = dmaenginem_async_device_register(dd);
 988         if (ret) {
 989                 dev_err(dev, "failed to register device\n");
 990                 goto err_free_irq;
 991         }
 992
 993         /* Register with OF DMA helpers. */
 994         ret = of_dma_controller_register(dev->of_node, jz4780_of_dma_xlate,
 995                                          jzdma);
 996         if (ret) {
 997                 dev_err(dev, "failed to register OF DMA controller\n");
 998                 goto err_free_irq;
 999         }
1000
1001         dev_info(dev, "JZ4780 DMA controller initialised\n");
1002         return 0;
1003
1004 err_free_irq:
1005         free_irq(jzdma->irq, jzdma);
1006
1007 err_disable_clk:
1008         clk_disable_unprepare(jzdma->clk);
1009         return ret;
1010 }
1011
1012 static int jz4780_dma_remove(struct platform_device *pdev)
1013 {
1014         struct jz4780_dma_dev *jzdma = platform_get_drvdata(pdev);
1015         int i;
1016
1017         of_dma_controller_free(pdev->dev.of_node);
1018
1019         clk_disable_unprepare(jzdma->clk);
1020         free_irq(jzdma->irq, jzdma);
1021
1022         for (i = 0; i < jzdma->soc_data->nb_channels; i++)
1023                 tasklet_kill(&jzdma->chan[i].vchan.task);
1024
1025         return 0;
1026 }
1027
1028 static const struct jz4780_dma_soc_data jz4740_dma_soc_data = {
1029         .nb_channels = 6,
1030         .transfer_ord_max = 5,
1031         .flags = JZ_SOC_DATA_BREAK_LINKS,
1032 };
1033
1034 static const struct jz4780_dma_soc_data jz4725b_dma_soc_data = {
1035         .nb_channels = 6,
1036         .transfer_ord_max = 5,
1037         .flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC |
1038                  JZ_SOC_DATA_BREAK_LINKS,
1039 };
1040
1041 static const struct jz4780_dma_soc_data jz4760_dma_soc_data = {
1042         .nb_channels = 5,
1043         .transfer_ord_max = 6,
1044         .flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
1045 };
1046
1047 static const struct jz4780_dma_soc_data jz4760_mdma_soc_data = {
1048         .nb_channels = 2,
1049         .transfer_ord_max = 6,
1050         .flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
1051 };
1052
1053 static const struct jz4780_dma_soc_data jz4760_bdma_soc_data = {
1054         .nb_channels = 3,
1055         .transfer_ord_max = 6,
1056         .flags = JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC,
1057 };
1058
1059 static const struct jz4780_dma_soc_data jz4760b_dma_soc_data = {
1060         .nb_channels = 5,
1061         .transfer_ord_max = 6,
1062         .flags = JZ_SOC_DATA_PER_CHAN_PM,
1063 };
1064
1065 static const struct jz4780_dma_soc_data jz4760b_mdma_soc_data = {
1066         .nb_channels = 2,
1067         .transfer_ord_max = 6,
1068         .flags = JZ_SOC_DATA_PER_CHAN_PM,
1069 };
1070
1071 static const struct jz4780_dma_soc_data jz4760b_bdma_soc_data = {
1072         .nb_channels = 3,
1073         .transfer_ord_max = 6,
1074         .flags = JZ_SOC_DATA_PER_CHAN_PM,
1075 };
1076
1077 static const struct jz4780_dma_soc_data jz4770_dma_soc_data = {
1078         .nb_channels = 6,
1079         .transfer_ord_max = 6,
1080         .flags = JZ_SOC_DATA_PER_CHAN_PM,
1081 };
1082
1083 static const struct jz4780_dma_soc_data jz4780_dma_soc_data = {
1084         .nb_channels = 32,
1085         .transfer_ord_max = 7,
1086         .flags = JZ_SOC_DATA_ALLOW_LEGACY_DT | JZ_SOC_DATA_PROGRAMMABLE_DMA,
1087 };
1088
1089 static const struct jz4780_dma_soc_data x1000_dma_soc_data = {
1090         .nb_channels = 8,
1091         .transfer_ord_max = 7,
1092         .flags = JZ_SOC_DATA_PROGRAMMABLE_DMA,
1093 };
1094
1095 static const struct jz4780_dma_soc_data x1830_dma_soc_data = {
1096         .nb_channels = 32,
1097         .transfer_ord_max = 7,
1098         .flags = JZ_SOC_DATA_PROGRAMMABLE_DMA,
1099 };
1100
1101 static const struct of_device_id jz4780_dma_dt_match[] = {
1102         { .compatible = "ingenic,jz4740-dma", .data = &jz4740_dma_soc_data },
1103         { .compatible = "ingenic,jz4725b-dma", .data = &jz4725b_dma_soc_data },
1104         { .compatible = "ingenic,jz4760-dma", .data = &jz4760_dma_soc_data },
1105         { .compatible = "ingenic,jz4760-mdma", .data = &jz4760_mdma_soc_data },
1106         { .compatible = "ingenic,jz4760-bdma", .data = &jz4760_bdma_soc_data },
1107         { .compatible = "ingenic,jz4760b-dma", .data = &jz4760b_dma_soc_data },
1108         { .compatible = "ingenic,jz4760b-mdma", .data = &jz4760b_mdma_soc_data },
1109         { .compatible = "ingenic,jz4760b-bdma", .data = &jz4760b_bdma_soc_data },
1110         { .compatible = "ingenic,jz4770-dma", .data = &jz4770_dma_soc_data },
1111         { .compatible = "ingenic,jz4780-dma", .data = &jz4780_dma_soc_data },
1112         { .compatible = "ingenic,x1000-dma", .data = &x1000_dma_soc_data },
1113         { .compatible = "ingenic,x1830-dma", .data = &x1830_dma_soc_data },
1114         {},
1115 };
1116 MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match);
1117
1118 static struct platform_driver jz4780_dma_driver = {
1119         .probe          = jz4780_dma_probe,
1120         .remove         = jz4780_dma_remove,
1121         .driver = {
1122                 .name   = "jz4780-dma",
1123                 .of_match_table = jz4780_dma_dt_match,
1124         },
1125 };
1126
1127 static int __init jz4780_dma_init(void)
1128 {
1129         return platform_driver_register(&jz4780_dma_driver);
1130 }
1131 subsys_initcall(jz4780_dma_init);
1132
1133 static void __exit jz4780_dma_exit(void)
1134 {
1135         platform_driver_unregister(&jz4780_dma_driver);
1136 }
1137 module_exit(jz4780_dma_exit);
1138
1139 MODULE_AUTHOR("Alex Smith <alex@alex-smith.me.uk>");
1140 MODULE_DESCRIPTION("Ingenic JZ4780 DMA controller driver");
1141 MODULE_LICENSE("GPL");