drivers/dma/fsl-edma-common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (c) 2013-2014 Freescale Semiconductor, Inc
   4 // Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>
   5
   6 #include <linux/dmapool.h>
   7 #include <linux/module.h>
   8 #include <linux/slab.h>
   9 #include <linux/dma-mapping.h>
  10
  11 #include "fsl-edma-common.h"
  12
  13 #define EDMA_CR                 0x00
  14 #define EDMA_ES                 0x04
  15 #define EDMA_ERQ                0x0C
  16 #define EDMA_EEI                0x14
  17 #define EDMA_SERQ               0x1B
  18 #define EDMA_CERQ               0x1A
  19 #define EDMA_SEEI               0x19
  20 #define EDMA_CEEI               0x18
  21 #define EDMA_CINT               0x1F
  22 #define EDMA_CERR               0x1E
  23 #define EDMA_SSRT               0x1D
  24 #define EDMA_CDNE               0x1C
  25 #define EDMA_INTR               0x24
  26 #define EDMA_ERR                0x2C
  27
  28 #define EDMA64_ERQH             0x08
  29 #define EDMA64_EEIH             0x10
  30 #define EDMA64_SERQ             0x18
  31 #define EDMA64_CERQ             0x19
  32 #define EDMA64_SEEI             0x1a
  33 #define EDMA64_CEEI             0x1b
  34 #define EDMA64_CINT             0x1c
  35 #define EDMA64_CERR             0x1d
  36 #define EDMA64_SSRT             0x1e
  37 #define EDMA64_CDNE             0x1f
  38 #define EDMA64_INTH             0x20
  39 #define EDMA64_INTL             0x24
  40 #define EDMA64_ERRH             0x28
  41 #define EDMA64_ERRL             0x2c
  42
  43 #define EDMA_TCD                0x1000
  44
  45 static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
  46 {
  47         struct edma_regs *regs = &fsl_chan->edma->regs;
  48         u32 ch = fsl_chan->vchan.chan.chan_id;
  49
  50         if (fsl_chan->edma->drvdata->version == v1) {
  51                 edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), regs->seei);
  52                 edma_writeb(fsl_chan->edma, ch, regs->serq);
  53         } else {
  54                 /* ColdFire is big endian, and accesses natively
  55                  * big endian I/O peripherals
  56                  */
  57                 iowrite8(EDMA_SEEI_SEEI(ch), regs->seei);
  58                 iowrite8(ch, regs->serq);
  59         }
  60 }
  61
  62 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
  63 {
  64         struct edma_regs *regs = &fsl_chan->edma->regs;
  65         u32 ch = fsl_chan->vchan.chan.chan_id;
  66
  67         if (fsl_chan->edma->drvdata->version == v1) {
  68                 edma_writeb(fsl_chan->edma, ch, regs->cerq);
  69                 edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), regs->ceei);
  70         } else {
  71                 /* ColdFire is big endian, and accesses natively
  72                  * big endian I/O peripherals
  73                  */
  74                 iowrite8(ch, regs->cerq);
  75                 iowrite8(EDMA_CEEI_CEEI(ch), regs->ceei);
  76         }
  77 }
  78 EXPORT_SYMBOL_GPL(fsl_edma_disable_request);
  79
  80 static void mux_configure8(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
  81                            u32 off, u32 slot, bool enable)
  82 {
  83         u8 val8;
  84
  85         if (enable)
  86                 val8 = EDMAMUX_CHCFG_ENBL | slot;
  87         else
  88                 val8 = EDMAMUX_CHCFG_DIS;
  89
  90         iowrite8(val8, addr + off);
  91 }
  92
  93 static void mux_configure32(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
  94                             u32 off, u32 slot, bool enable)
  95 {
  96         u32 val;
  97
  98         if (enable)
  99                 val = EDMAMUX_CHCFG_ENBL << 24 | slot;
 100         else
 101                 val = EDMAMUX_CHCFG_DIS;
 102
 103         iowrite32(val, addr + off * 4);
 104 }
 105
 106 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 107                        unsigned int slot, bool enable)
 108 {
 109         u32 ch = fsl_chan->vchan.chan.chan_id;
 110         void __iomem *muxaddr;
 111         unsigned int chans_per_mux, ch_off;
 112         u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
 113
 114         chans_per_mux = fsl_chan->edma->n_chans / dmamux_nr;
 115         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
 116         muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 117         slot = EDMAMUX_CHCFG_SOURCE(slot);
 118
 119         if (fsl_chan->edma->drvdata->version == v3)
 120                 mux_configure32(fsl_chan, muxaddr, ch_off, slot, enable);
 121         else
 122                 mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
 123 }
 124 EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);
 125
 126 static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
 127 {
 128         switch (addr_width) {
 129         case 1:
 130                 return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
 131         case 2:
 132                 return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
 133         case 4:
 134                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 135         case 8:
 136                 return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
 137         default:
 138                 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
 139         }
 140 }
 141
 142 void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
 143 {
 144         struct fsl_edma_desc *fsl_desc;
 145         int i;
 146
 147         fsl_desc = to_fsl_edma_desc(vdesc);
 148         for (i = 0; i < fsl_desc->n_tcds; i++)
 149                 dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
 150                               fsl_desc->tcd[i].ptcd);
 151         kfree(fsl_desc);
 152 }
 153 EXPORT_SYMBOL_GPL(fsl_edma_free_desc);
 154
 155 int fsl_edma_terminate_all(struct dma_chan *chan)
 156 {
 157         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 158         unsigned long flags;
 159         LIST_HEAD(head);
 160
 161         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 162         fsl_edma_disable_request(fsl_chan);
 163         fsl_chan->edesc = NULL;
 164         fsl_chan->idle = true;
 165         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 166         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 167         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 168         return 0;
 169 }
 170 EXPORT_SYMBOL_GPL(fsl_edma_terminate_all);
 171
 172 int fsl_edma_pause(struct dma_chan *chan)
 173 {
 174         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 175         unsigned long flags;
 176
 177         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 178         if (fsl_chan->edesc) {
 179                 fsl_edma_disable_request(fsl_chan);
 180                 fsl_chan->status = DMA_PAUSED;
 181                 fsl_chan->idle = true;
 182         }
 183         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 184         return 0;
 185 }
 186 EXPORT_SYMBOL_GPL(fsl_edma_pause);
 187
 188 int fsl_edma_resume(struct dma_chan *chan)
 189 {
 190         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 191         unsigned long flags;
 192
 193         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 194         if (fsl_chan->edesc) {
 195                 fsl_edma_enable_request(fsl_chan);
 196                 fsl_chan->status = DMA_IN_PROGRESS;
 197                 fsl_chan->idle = false;
 198         }
 199         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(fsl_edma_resume);
 203
 204 static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
 205 {
 206         if (fsl_chan->dma_dir != DMA_NONE)
 207                 dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
 208                                    fsl_chan->dma_dev_addr,
 209                                    fsl_chan->dma_dev_size,
 210                                    fsl_chan->dma_dir, 0);
 211         fsl_chan->dma_dir = DMA_NONE;
 212 }
 213
 214 static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
 215                                     enum dma_transfer_direction dir)
 216 {
 217         struct device *dev = fsl_chan->vchan.chan.device->dev;
 218         enum dma_data_direction dma_dir;
 219         phys_addr_t addr = 0;
 220         u32 size = 0;
 221
 222         switch (dir) {
 223         case DMA_MEM_TO_DEV:
 224                 dma_dir = DMA_FROM_DEVICE;
 225                 addr = fsl_chan->cfg.dst_addr;
 226                 size = fsl_chan->cfg.dst_maxburst;
 227                 break;
 228         case DMA_DEV_TO_MEM:
 229                 dma_dir = DMA_TO_DEVICE;
 230                 addr = fsl_chan->cfg.src_addr;
 231                 size = fsl_chan->cfg.src_maxburst;
 232                 break;
 233         default:
 234                 dma_dir = DMA_NONE;
 235                 break;
 236         }
 237
 238         /* Already mapped for this config? */
 239         if (fsl_chan->dma_dir == dma_dir)
 240                 return true;
 241
 242         fsl_edma_unprep_slave_dma(fsl_chan);
 243
 244         fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
 245         if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
 246                 return false;
 247         fsl_chan->dma_dev_size = size;
 248         fsl_chan->dma_dir = dma_dir;
 249
 250         return true;
 251 }
 252
 253 int fsl_edma_slave_config(struct dma_chan *chan,
 254                                  struct dma_slave_config *cfg)
 255 {
 256         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 257
 258         memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
 259         fsl_edma_unprep_slave_dma(fsl_chan);
 260
 261         return 0;
 262 }
 263 EXPORT_SYMBOL_GPL(fsl_edma_slave_config);
 264
 265 static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
 266                 struct virt_dma_desc *vdesc, bool in_progress)
 267 {
 268         struct fsl_edma_desc *edesc = fsl_chan->edesc;
 269         struct edma_regs *regs = &fsl_chan->edma->regs;
 270         u32 ch = fsl_chan->vchan.chan.chan_id;
 271         enum dma_transfer_direction dir = edesc->dirn;
 272         dma_addr_t cur_addr, dma_addr;
 273         size_t len, size;
 274         int i;
 275
 276         /* calculate the total size in this desc */
 277         for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
 278                 len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
 279                         * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 280
 281         if (!in_progress)
 282                 return len;
 283
 284         if (dir == DMA_MEM_TO_DEV)
 285                 cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].saddr);
 286         else
 287                 cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].daddr);
 288
 289         /* figure out the finished and calculate the residue */
 290         for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
 291                 size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
 292                         * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 293                 if (dir == DMA_MEM_TO_DEV)
 294                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
 295                 else
 296                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
 297
 298                 len -= size;
 299                 if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
 300                         len += dma_addr + size - cur_addr;
 301                         break;
 302                 }
 303         }
 304
 305         return len;
 306 }
 307
 308 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 309                 dma_cookie_t cookie, struct dma_tx_state *txstate)
 310 {
 311         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 312         struct virt_dma_desc *vdesc;
 313         enum dma_status status;
 314         unsigned long flags;
 315
 316         status = dma_cookie_status(chan, cookie, txstate);
 317         if (status == DMA_COMPLETE)
 318                 return status;
 319
 320         if (!txstate)
 321                 return fsl_chan->status;
 322
 323         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 324         vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
 325         if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
 326                 txstate->residue =
 327                         fsl_edma_desc_residue(fsl_chan, vdesc, true);
 328         else if (vdesc)
 329                 txstate->residue =
 330                         fsl_edma_desc_residue(fsl_chan, vdesc, false);
 331         else
 332                 txstate->residue = 0;
 333
 334         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 335
 336         return fsl_chan->status;
 337 }
 338 EXPORT_SYMBOL_GPL(fsl_edma_tx_status);
 339
 340 static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
 341                                   struct fsl_edma_hw_tcd *tcd)
 342 {
 343         struct fsl_edma_engine *edma = fsl_chan->edma;
 344         struct edma_regs *regs = &fsl_chan->edma->regs;
 345         u32 ch = fsl_chan->vchan.chan.chan_id;
 346
 347         /*
 348          * TCD parameters are stored in struct fsl_edma_hw_tcd in little
 349          * endian format. However, we need to load the TCD registers in
 350          * big- or little-endian obeying the eDMA engine model endian,
 351          * and this is performed from specific edma_write functions
 352          */
 353         edma_writew(edma, 0,  &regs->tcd[ch].csr);
 354
 355         edma_writel(edma, (s32)tcd->saddr, &regs->tcd[ch].saddr);
 356         edma_writel(edma, (s32)tcd->daddr, &regs->tcd[ch].daddr);
 357
 358         edma_writew(edma, (s16)tcd->attr, &regs->tcd[ch].attr);
 359         edma_writew(edma, tcd->soff, &regs->tcd[ch].soff);
 360
 361         edma_writel(edma, (s32)tcd->nbytes, &regs->tcd[ch].nbytes);
 362         edma_writel(edma, (s32)tcd->slast, &regs->tcd[ch].slast);
 363
 364         edma_writew(edma, (s16)tcd->citer, &regs->tcd[ch].citer);
 365         edma_writew(edma, (s16)tcd->biter, &regs->tcd[ch].biter);
 366         edma_writew(edma, (s16)tcd->doff, &regs->tcd[ch].doff);
 367
 368         edma_writel(edma, (s32)tcd->dlast_sga,
 369                         &regs->tcd[ch].dlast_sga);
 370
 371         edma_writew(edma, (s16)tcd->csr, &regs->tcd[ch].csr);
 372 }
 373
 374 static inline
 375 void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
 376                        u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
 377                        u16 biter, u16 doff, u32 dlast_sga, bool major_int,
 378                        bool disable_req, bool enable_sg)
 379 {
 380         u16 csr = 0;
 381
 382         /*
 383          * eDMA hardware SGs require the TCDs to be stored in little
 384          * endian format irrespective of the register endian model.
 385          * So we put the value in little endian in memory, waiting
 386          * for fsl_edma_set_tcd_regs doing the swap.
 387          */
 388         tcd->saddr = cpu_to_le32(src);
 389         tcd->daddr = cpu_to_le32(dst);
 390
 391         tcd->attr = cpu_to_le16(attr);
 392
 393         tcd->soff = cpu_to_le16(soff);
 394
 395         tcd->nbytes = cpu_to_le32(nbytes);
 396         tcd->slast = cpu_to_le32(slast);
 397
 398         tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
 399         tcd->doff = cpu_to_le16(doff);
 400
 401         tcd->dlast_sga = cpu_to_le32(dlast_sga);
 402
 403         tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
 404         if (major_int)
 405                 csr |= EDMA_TCD_CSR_INT_MAJOR;
 406
 407         if (disable_req)
 408                 csr |= EDMA_TCD_CSR_D_REQ;
 409
 410         if (enable_sg)
 411                 csr |= EDMA_TCD_CSR_E_SG;
 412
 413         tcd->csr = cpu_to_le16(csr);
 414 }
 415
 416 static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
 417                 int sg_len)
 418 {
 419         struct fsl_edma_desc *fsl_desc;
 420         int i;
 421
 422         fsl_desc = kzalloc(struct_size(fsl_desc, tcd, sg_len), GFP_NOWAIT);
 423         if (!fsl_desc)
 424                 return NULL;
 425
 426         fsl_desc->echan = fsl_chan;
 427         fsl_desc->n_tcds = sg_len;
 428         for (i = 0; i < sg_len; i++) {
 429                 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
 430                                         GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
 431                 if (!fsl_desc->tcd[i].vtcd)
 432                         goto err;
 433         }
 434         return fsl_desc;
 435
 436 err:
 437         while (--i >= 0)
 438                 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
 439                                 fsl_desc->tcd[i].ptcd);
 440         kfree(fsl_desc);
 441         return NULL;
 442 }
 443
 444 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 445                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 446                 size_t period_len, enum dma_transfer_direction direction,
 447                 unsigned long flags)
 448 {
 449         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 450         struct fsl_edma_desc *fsl_desc;
 451         dma_addr_t dma_buf_next;
 452         int sg_len, i;
 453         u32 src_addr, dst_addr, last_sg, nbytes;
 454         u16 soff, doff, iter;
 455
 456         if (!is_slave_direction(direction))
 457                 return NULL;
 458
 459         if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
 460                 return NULL;
 461
 462         sg_len = buf_len / period_len;
 463         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 464         if (!fsl_desc)
 465                 return NULL;
 466         fsl_desc->iscyclic = true;
 467         fsl_desc->dirn = direction;
 468
 469         dma_buf_next = dma_addr;
 470         if (direction == DMA_MEM_TO_DEV) {
 471                 fsl_chan->attr =
 472                         fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
 473                 nbytes = fsl_chan->cfg.dst_addr_width *
 474                         fsl_chan->cfg.dst_maxburst;
 475         } else {
 476                 fsl_chan->attr =
 477                         fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
 478                 nbytes = fsl_chan->cfg.src_addr_width *
 479                         fsl_chan->cfg.src_maxburst;
 480         }
 481
 482         iter = period_len / nbytes;
 483
 484         for (i = 0; i < sg_len; i++) {
 485                 if (dma_buf_next >= dma_addr + buf_len)
 486                         dma_buf_next = dma_addr;
 487
 488                 /* get next sg's physical address */
 489                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 490
 491                 if (direction == DMA_MEM_TO_DEV) {
 492                         src_addr = dma_buf_next;
 493                         dst_addr = fsl_chan->dma_dev_addr;
 494                         soff = fsl_chan->cfg.dst_addr_width;
 495                         doff = 0;
 496                 } else {
 497                         src_addr = fsl_chan->dma_dev_addr;
 498                         dst_addr = dma_buf_next;
 499                         soff = 0;
 500                         doff = fsl_chan->cfg.src_addr_width;
 501                 }
 502
 503                 fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
 504                                   fsl_chan->attr, soff, nbytes, 0, iter,
 505                                   iter, doff, last_sg, true, false, true);
 506                 dma_buf_next += period_len;
 507         }
 508
 509         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 510 }
 511 EXPORT_SYMBOL_GPL(fsl_edma_prep_dma_cyclic);
 512
 513 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 514                 struct dma_chan *chan, struct scatterlist *sgl,
 515                 unsigned int sg_len, enum dma_transfer_direction direction,
 516                 unsigned long flags, void *context)
 517 {
 518         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 519         struct fsl_edma_desc *fsl_desc;
 520         struct scatterlist *sg;
 521         u32 src_addr, dst_addr, last_sg, nbytes;
 522         u16 soff, doff, iter;
 523         int i;
 524
 525         if (!is_slave_direction(direction))
 526                 return NULL;
 527
 528         if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
 529                 return NULL;
 530
 531         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 532         if (!fsl_desc)
 533                 return NULL;
 534         fsl_desc->iscyclic = false;
 535         fsl_desc->dirn = direction;
 536
 537         if (direction == DMA_MEM_TO_DEV) {
 538                 fsl_chan->attr =
 539                         fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
 540                 nbytes = fsl_chan->cfg.dst_addr_width *
 541                         fsl_chan->cfg.dst_maxburst;
 542         } else {
 543                 fsl_chan->attr =
 544                         fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
 545                 nbytes = fsl_chan->cfg.src_addr_width *
 546                         fsl_chan->cfg.src_maxburst;
 547         }
 548
 549         for_each_sg(sgl, sg, sg_len, i) {
 550                 /* get next sg's physical address */
 551                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 552
 553                 if (direction == DMA_MEM_TO_DEV) {
 554                         src_addr = sg_dma_address(sg);
 555                         dst_addr = fsl_chan->dma_dev_addr;
 556                         soff = fsl_chan->cfg.dst_addr_width;
 557                         doff = 0;
 558                 } else {
 559                         src_addr = fsl_chan->dma_dev_addr;
 560                         dst_addr = sg_dma_address(sg);
 561                         soff = 0;
 562                         doff = fsl_chan->cfg.src_addr_width;
 563                 }
 564
 565                 iter = sg_dma_len(sg) / nbytes;
 566                 if (i < sg_len - 1) {
 567                         last_sg = fsl_desc->tcd[(i + 1)].ptcd;
 568                         fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
 569                                           dst_addr, fsl_chan->attr, soff,
 570                                           nbytes, 0, iter, iter, doff, last_sg,
 571                                           false, false, true);
 572                 } else {
 573                         last_sg = 0;
 574                         fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
 575                                           dst_addr, fsl_chan->attr, soff,
 576                                           nbytes, 0, iter, iter, doff, last_sg,
 577                                           true, true, false);
 578                 }
 579         }
 580
 581         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 582 }
 583 EXPORT_SYMBOL_GPL(fsl_edma_prep_slave_sg);
 584
 585 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
 586 {
 587         struct virt_dma_desc *vdesc;
 588
 589         vdesc = vchan_next_desc(&fsl_chan->vchan);
 590         if (!vdesc)
 591                 return;
 592         fsl_chan->edesc = to_fsl_edma_desc(vdesc);
 593         fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
 594         fsl_edma_enable_request(fsl_chan);
 595         fsl_chan->status = DMA_IN_PROGRESS;
 596         fsl_chan->idle = false;
 597 }
 598 EXPORT_SYMBOL_GPL(fsl_edma_xfer_desc);
 599
 600 void fsl_edma_issue_pending(struct dma_chan *chan)
 601 {
 602         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 603         unsigned long flags;
 604
 605         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 606
 607         if (unlikely(fsl_chan->pm_state != RUNNING)) {
 608                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 609                 /* cannot submit due to suspend */
 610                 return;
 611         }
 612
 613         if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
 614                 fsl_edma_xfer_desc(fsl_chan);
 615
 616         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 617 }
 618 EXPORT_SYMBOL_GPL(fsl_edma_issue_pending);
 619
 620 int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 621 {
 622         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 623
 624         fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
 625                                 sizeof(struct fsl_edma_hw_tcd),
 626                                 32, 0);
 627         return 0;
 628 }
 629 EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);
 630
 631 void fsl_edma_free_chan_resources(struct dma_chan *chan)
 632 {
 633         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 634         unsigned long flags;
 635         LIST_HEAD(head);
 636
 637         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 638         fsl_edma_disable_request(fsl_chan);
 639         fsl_edma_chan_mux(fsl_chan, 0, false);
 640         fsl_chan->edesc = NULL;
 641         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 642         fsl_edma_unprep_slave_dma(fsl_chan);
 643         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 644
 645         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 646         dma_pool_destroy(fsl_chan->tcd_pool);
 647         fsl_chan->tcd_pool = NULL;
 648 }
 649 EXPORT_SYMBOL_GPL(fsl_edma_free_chan_resources);
 650
 651 void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
 652 {
 653         struct fsl_edma_chan *chan, *_chan;
 654
 655         list_for_each_entry_safe(chan, _chan,
 656                                 &dmadev->channels, vchan.chan.device_node) {
 657                 list_del(&chan->vchan.chan.device_node);
 658                 tasklet_kill(&chan->vchan.task);
 659         }
 660 }
 661 EXPORT_SYMBOL_GPL(fsl_edma_cleanup_vchan);
 662
 663 /*
 664  * On the 32 channels Vybrid/mpc577x edma version (here called "v1"),
 665  * register offsets are different compared to ColdFire mcf5441x 64 channels
 666  * edma (here called "v2").
 667  *
 668  * This function sets up register offsets as per proper declared version
 669  * so must be called in xxx_edma_probe() just after setting the
 670  * edma "version" and "membase" appropriately.
 671  */
 672 void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
 673 {
 674         edma->regs.cr = edma->membase + EDMA_CR;
 675         edma->regs.es = edma->membase + EDMA_ES;
 676         edma->regs.erql = edma->membase + EDMA_ERQ;
 677         edma->regs.eeil = edma->membase + EDMA_EEI;
 678
 679         edma->regs.serq = edma->membase + ((edma->drvdata->version == v2) ?
 680                         EDMA64_SERQ : EDMA_SERQ);
 681         edma->regs.cerq = edma->membase + ((edma->drvdata->version == v2) ?
 682                         EDMA64_CERQ : EDMA_CERQ);
 683         edma->regs.seei = edma->membase + ((edma->drvdata->version == v2) ?
 684                         EDMA64_SEEI : EDMA_SEEI);
 685         edma->regs.ceei = edma->membase + ((edma->drvdata->version == v2) ?
 686                         EDMA64_CEEI : EDMA_CEEI);
 687         edma->regs.cint = edma->membase + ((edma->drvdata->version == v2) ?
 688                         EDMA64_CINT : EDMA_CINT);
 689         edma->regs.cerr = edma->membase + ((edma->drvdata->version == v2) ?
 690                         EDMA64_CERR : EDMA_CERR);
 691         edma->regs.ssrt = edma->membase + ((edma->drvdata->version == v2) ?
 692                         EDMA64_SSRT : EDMA_SSRT);
 693         edma->regs.cdne = edma->membase + ((edma->drvdata->version == v2) ?
 694                         EDMA64_CDNE : EDMA_CDNE);
 695         edma->regs.intl = edma->membase + ((edma->drvdata->version == v2) ?
 696                         EDMA64_INTL : EDMA_INTR);
 697         edma->regs.errl = edma->membase + ((edma->drvdata->version == v2) ?
 698                         EDMA64_ERRL : EDMA_ERR);
 699
 700         if (edma->drvdata->version == v2) {
 701                 edma->regs.erqh = edma->membase + EDMA64_ERQH;
 702                 edma->regs.eeih = edma->membase + EDMA64_EEIH;
 703                 edma->regs.errh = edma->membase + EDMA64_ERRH;
 704                 edma->regs.inth = edma->membase + EDMA64_INTH;
 705         }
 706
 707         edma->regs.tcd = edma->membase + EDMA_TCD;
 708 }
 709 EXPORT_SYMBOL_GPL(fsl_edma_setup_regs);
 710
 711 MODULE_LICENSE("GPL v2");