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 #include <linux/pm_runtime.h>
  11 #include <linux/pm_domain.h>
  12
  13 #include "fsl-edma-common.h"
  14
  15 #define EDMA_CR                 0x00
  16 #define EDMA_ES                 0x04
  17 #define EDMA_ERQ                0x0C
  18 #define EDMA_EEI                0x14
  19 #define EDMA_SERQ               0x1B
  20 #define EDMA_CERQ               0x1A
  21 #define EDMA_SEEI               0x19
  22 #define EDMA_CEEI               0x18
  23 #define EDMA_CINT               0x1F
  24 #define EDMA_CERR               0x1E
  25 #define EDMA_SSRT               0x1D
  26 #define EDMA_CDNE               0x1C
  27 #define EDMA_INTR               0x24
  28 #define EDMA_ERR                0x2C
  29
  30 #define EDMA64_ERQH             0x08
  31 #define EDMA64_EEIH             0x10
  32 #define EDMA64_SERQ             0x18
  33 #define EDMA64_CERQ             0x19
  34 #define EDMA64_SEEI             0x1a
  35 #define EDMA64_CEEI             0x1b
  36 #define EDMA64_CINT             0x1c
  37 #define EDMA64_CERR             0x1d
  38 #define EDMA64_SSRT             0x1e
  39 #define EDMA64_CDNE             0x1f
  40 #define EDMA64_INTH             0x20
  41 #define EDMA64_INTL             0x24
  42 #define EDMA64_ERRH             0x28
  43 #define EDMA64_ERRL             0x2c
  44
  45 void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan)
  46 {
  47         spin_lock(&fsl_chan->vchan.lock);
  48
  49         if (!fsl_chan->edesc) {
  50                 /* terminate_all called before */
  51                 spin_unlock(&fsl_chan->vchan.lock);
  52                 return;
  53         }
  54
  55         if (!fsl_chan->edesc->iscyclic) {
  56                 list_del(&fsl_chan->edesc->vdesc.node);
  57                 vchan_cookie_complete(&fsl_chan->edesc->vdesc);
  58                 fsl_chan->edesc = NULL;
  59                 fsl_chan->status = DMA_COMPLETE;
  60                 fsl_chan->idle = true;
  61         } else {
  62                 vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
  63         }
  64
  65         if (!fsl_chan->edesc)
  66                 fsl_edma_xfer_desc(fsl_chan);
  67
  68         spin_unlock(&fsl_chan->vchan.lock);
  69 }
  70
  71 static void fsl_edma3_enable_request(struct fsl_edma_chan *fsl_chan)
  72 {
  73         u32 val, flags;
  74
  75         flags = fsl_edma_drvflags(fsl_chan);
  76         val = edma_readl_chreg(fsl_chan, ch_sbr);
  77         /* Remote/local swapped wrongly on iMX8 QM Audio edma */
  78         if (flags & FSL_EDMA_DRV_QUIRK_SWAPPED) {
  79                 if (!fsl_chan->is_rxchan)
  80                         val |= EDMA_V3_CH_SBR_RD;
  81                 else
  82                         val |= EDMA_V3_CH_SBR_WR;
  83         } else {
  84                 if (fsl_chan->is_rxchan)
  85                         val |= EDMA_V3_CH_SBR_RD;
  86                 else
  87                         val |= EDMA_V3_CH_SBR_WR;
  88         }
  89
  90         if (fsl_chan->is_remote)
  91                 val &= ~(EDMA_V3_CH_SBR_RD | EDMA_V3_CH_SBR_WR);
  92
  93         edma_writel_chreg(fsl_chan, val, ch_sbr);
  94
  95         if (flags & FSL_EDMA_DRV_HAS_CHMUX) {
  96                 /*
  97                  * ch_mux: With the exception of 0, attempts to write a value
  98                  * already in use will be forced to 0.
  99                  */
 100                 if (!edma_readl_chreg(fsl_chan, ch_mux))
 101                         edma_writel_chreg(fsl_chan, fsl_chan->srcid, ch_mux);
 102         }
 103
 104         val = edma_readl_chreg(fsl_chan, ch_csr);
 105         val |= EDMA_V3_CH_CSR_ERQ;
 106         edma_writel_chreg(fsl_chan, val, ch_csr);
 107 }
 108
 109 static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
 110 {
 111         struct edma_regs *regs = &fsl_chan->edma->regs;
 112         u32 ch = fsl_chan->vchan.chan.chan_id;
 113
 114         if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_SPLIT_REG)
 115                 return fsl_edma3_enable_request(fsl_chan);
 116
 117         if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_WRAP_IO) {
 118                 edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), regs->seei);
 119                 edma_writeb(fsl_chan->edma, ch, regs->serq);
 120         } else {
 121                 /* ColdFire is big endian, and accesses natively
 122                  * big endian I/O peripherals
 123                  */
 124                 iowrite8(EDMA_SEEI_SEEI(ch), regs->seei);
 125                 iowrite8(ch, regs->serq);
 126         }
 127 }
 128
 129 static void fsl_edma3_disable_request(struct fsl_edma_chan *fsl_chan)
 130 {
 131         u32 val = edma_readl_chreg(fsl_chan, ch_csr);
 132         u32 flags;
 133
 134         flags = fsl_edma_drvflags(fsl_chan);
 135
 136         if (flags & FSL_EDMA_DRV_HAS_CHMUX)
 137                 edma_writel_chreg(fsl_chan, 0, ch_mux);
 138
 139         val &= ~EDMA_V3_CH_CSR_ERQ;
 140         edma_writel_chreg(fsl_chan, val, ch_csr);
 141 }
 142
 143 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
 144 {
 145         struct edma_regs *regs = &fsl_chan->edma->regs;
 146         u32 ch = fsl_chan->vchan.chan.chan_id;
 147
 148         if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_SPLIT_REG)
 149                 return fsl_edma3_disable_request(fsl_chan);
 150
 151         if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_WRAP_IO) {
 152                 edma_writeb(fsl_chan->edma, ch, regs->cerq);
 153                 edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), regs->ceei);
 154         } else {
 155                 /* ColdFire is big endian, and accesses natively
 156                  * big endian I/O peripherals
 157                  */
 158                 iowrite8(ch, regs->cerq);
 159                 iowrite8(EDMA_CEEI_CEEI(ch), regs->ceei);
 160         }
 161 }
 162
 163 static void mux_configure8(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
 164                            u32 off, u32 slot, bool enable)
 165 {
 166         u8 val8;
 167
 168         if (enable)
 169                 val8 = EDMAMUX_CHCFG_ENBL | slot;
 170         else
 171                 val8 = EDMAMUX_CHCFG_DIS;
 172
 173         iowrite8(val8, addr + off);
 174 }
 175
 176 static void mux_configure32(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
 177                             u32 off, u32 slot, bool enable)
 178 {
 179         u32 val;
 180
 181         if (enable)
 182                 val = EDMAMUX_CHCFG_ENBL << 24 | slot;
 183         else
 184                 val = EDMAMUX_CHCFG_DIS;
 185
 186         iowrite32(val, addr + off * 4);
 187 }
 188
 189 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 190                        unsigned int slot, bool enable)
 191 {
 192         u32 ch = fsl_chan->vchan.chan.chan_id;
 193         void __iomem *muxaddr;
 194         unsigned int chans_per_mux, ch_off;
 195         int endian_diff[4] = {3, 1, -1, -3};
 196         u32 dmamux_nr = fsl_chan->edma->drvdata->dmamuxs;
 197
 198         if (!dmamux_nr)
 199                 return;
 200
 201         chans_per_mux = fsl_chan->edma->n_chans / dmamux_nr;
 202         ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
 203
 204         if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_MUX_SWAP)
 205                 ch_off += endian_diff[ch_off % 4];
 206
 207         muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 208         slot = EDMAMUX_CHCFG_SOURCE(slot);
 209
 210         if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_CONFIG32)
 211                 mux_configure32(fsl_chan, muxaddr, ch_off, slot, enable);
 212         else
 213                 mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
 214 }
 215
 216 static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
 217 {
 218         u32 val;
 219
 220         if (addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
 221                 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 222
 223         val = ffs(addr_width) - 1;
 224         return val | (val << 8);
 225 }
 226
 227 void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
 228 {
 229         struct fsl_edma_desc *fsl_desc;
 230         int i;
 231
 232         fsl_desc = to_fsl_edma_desc(vdesc);
 233         for (i = 0; i < fsl_desc->n_tcds; i++)
 234                 dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
 235                               fsl_desc->tcd[i].ptcd);
 236         kfree(fsl_desc);
 237 }
 238
 239 int fsl_edma_terminate_all(struct dma_chan *chan)
 240 {
 241         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 242         unsigned long flags;
 243         LIST_HEAD(head);
 244
 245         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 246         fsl_edma_disable_request(fsl_chan);
 247         fsl_chan->edesc = NULL;
 248         fsl_chan->idle = true;
 249         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 250         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 251         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 252
 253         if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_HAS_PD)
 254                 pm_runtime_allow(fsl_chan->pd_dev);
 255
 256         return 0;
 257 }
 258
 259 int fsl_edma_pause(struct dma_chan *chan)
 260 {
 261         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 265         if (fsl_chan->edesc) {
 266                 fsl_edma_disable_request(fsl_chan);
 267                 fsl_chan->status = DMA_PAUSED;
 268                 fsl_chan->idle = true;
 269         }
 270         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 271         return 0;
 272 }
 273
 274 int fsl_edma_resume(struct dma_chan *chan)
 275 {
 276         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 277         unsigned long flags;
 278
 279         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 280         if (fsl_chan->edesc) {
 281                 fsl_edma_enable_request(fsl_chan);
 282                 fsl_chan->status = DMA_IN_PROGRESS;
 283                 fsl_chan->idle = false;
 284         }
 285         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 286         return 0;
 287 }
 288
 289 static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
 290 {
 291         if (fsl_chan->dma_dir != DMA_NONE)
 292                 dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
 293                                    fsl_chan->dma_dev_addr,
 294                                    fsl_chan->dma_dev_size,
 295                                    fsl_chan->dma_dir, 0);
 296         fsl_chan->dma_dir = DMA_NONE;
 297 }
 298
 299 static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
 300                                     enum dma_transfer_direction dir)
 301 {
 302         struct device *dev = fsl_chan->vchan.chan.device->dev;
 303         enum dma_data_direction dma_dir;
 304         phys_addr_t addr = 0;
 305         u32 size = 0;
 306
 307         switch (dir) {
 308         case DMA_MEM_TO_DEV:
 309                 dma_dir = DMA_FROM_DEVICE;
 310                 addr = fsl_chan->cfg.dst_addr;
 311                 size = fsl_chan->cfg.dst_maxburst;
 312                 break;
 313         case DMA_DEV_TO_MEM:
 314                 dma_dir = DMA_TO_DEVICE;
 315                 addr = fsl_chan->cfg.src_addr;
 316                 size = fsl_chan->cfg.src_maxburst;
 317                 break;
 318         default:
 319                 dma_dir = DMA_NONE;
 320                 break;
 321         }
 322
 323         /* Already mapped for this config? */
 324         if (fsl_chan->dma_dir == dma_dir)
 325                 return true;
 326
 327         fsl_edma_unprep_slave_dma(fsl_chan);
 328
 329         fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
 330         if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
 331                 return false;
 332         fsl_chan->dma_dev_size = size;
 333         fsl_chan->dma_dir = dma_dir;
 334
 335         return true;
 336 }
 337
 338 int fsl_edma_slave_config(struct dma_chan *chan,
 339                                  struct dma_slave_config *cfg)
 340 {
 341         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 342
 343         memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
 344         fsl_edma_unprep_slave_dma(fsl_chan);
 345
 346         return 0;
 347 }
 348
 349 static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
 350                 struct virt_dma_desc *vdesc, bool in_progress)
 351 {
 352         struct fsl_edma_desc *edesc = fsl_chan->edesc;
 353         enum dma_transfer_direction dir = edesc->dirn;
 354         dma_addr_t cur_addr, dma_addr;
 355         size_t len, size;
 356         u32 nbytes = 0;
 357         int i;
 358
 359         /* calculate the total size in this desc */
 360         for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) {
 361                 nbytes = le32_to_cpu(edesc->tcd[i].vtcd->nbytes);
 362                 if (nbytes & (EDMA_V3_TCD_NBYTES_DMLOE | EDMA_V3_TCD_NBYTES_SMLOE))
 363                         nbytes = EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(nbytes);
 364                 len += nbytes * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 365         }
 366
 367         if (!in_progress)
 368                 return len;
 369
 370         if (dir == DMA_MEM_TO_DEV)
 371                 cur_addr = edma_read_tcdreg(fsl_chan, saddr);
 372         else
 373                 cur_addr = edma_read_tcdreg(fsl_chan, daddr);
 374
 375         /* figure out the finished and calculate the residue */
 376         for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
 377                 nbytes = le32_to_cpu(edesc->tcd[i].vtcd->nbytes);
 378                 if (nbytes & (EDMA_V3_TCD_NBYTES_DMLOE | EDMA_V3_TCD_NBYTES_SMLOE))
 379                         nbytes = EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(nbytes);
 380
 381                 size = nbytes * le16_to_cpu(edesc->tcd[i].vtcd->biter);
 382
 383                 if (dir == DMA_MEM_TO_DEV)
 384                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
 385                 else
 386                         dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
 387
 388                 len -= size;
 389                 if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
 390                         len += dma_addr + size - cur_addr;
 391                         break;
 392                 }
 393         }
 394
 395         return len;
 396 }
 397
 398 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 399                 dma_cookie_t cookie, struct dma_tx_state *txstate)
 400 {
 401         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 402         struct virt_dma_desc *vdesc;
 403         enum dma_status status;
 404         unsigned long flags;
 405
 406         status = dma_cookie_status(chan, cookie, txstate);
 407         if (status == DMA_COMPLETE)
 408                 return status;
 409
 410         if (!txstate)
 411                 return fsl_chan->status;
 412
 413         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 414         vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
 415         if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
 416                 txstate->residue =
 417                         fsl_edma_desc_residue(fsl_chan, vdesc, true);
 418         else if (vdesc)
 419                 txstate->residue =
 420                         fsl_edma_desc_residue(fsl_chan, vdesc, false);
 421         else
 422                 txstate->residue = 0;
 423
 424         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 425
 426         return fsl_chan->status;
 427 }
 428
 429 static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
 430                                   struct fsl_edma_hw_tcd *tcd)
 431 {
 432         u16 csr = 0;
 433
 434         /*
 435          * TCD parameters are stored in struct fsl_edma_hw_tcd in little
 436          * endian format. However, we need to load the TCD registers in
 437          * big- or little-endian obeying the eDMA engine model endian,
 438          * and this is performed from specific edma_write functions
 439          */
 440         edma_write_tcdreg(fsl_chan, 0, csr);
 441
 442         edma_write_tcdreg(fsl_chan, tcd->saddr, saddr);
 443         edma_write_tcdreg(fsl_chan, tcd->daddr, daddr);
 444
 445         edma_write_tcdreg(fsl_chan, tcd->attr, attr);
 446         edma_write_tcdreg(fsl_chan, tcd->soff, soff);
 447
 448         edma_write_tcdreg(fsl_chan, tcd->nbytes, nbytes);
 449         edma_write_tcdreg(fsl_chan, tcd->slast, slast);
 450
 451         edma_write_tcdreg(fsl_chan, tcd->citer, citer);
 452         edma_write_tcdreg(fsl_chan, tcd->biter, biter);
 453         edma_write_tcdreg(fsl_chan, tcd->doff, doff);
 454
 455         edma_write_tcdreg(fsl_chan, tcd->dlast_sga, dlast_sga);
 456
 457         csr = le16_to_cpu(tcd->csr);
 458
 459         if (fsl_chan->is_sw) {
 460                 csr |= EDMA_TCD_CSR_START;
 461                 tcd->csr = cpu_to_le16(csr);
 462         }
 463
 464         /*
 465          * Must clear CHn_CSR[DONE] bit before enable TCDn_CSR[ESG] at EDMAv3
 466          * eDMAv4 have not such requirement.
 467          * Change MLINK need clear CHn_CSR[DONE] for both eDMAv3 and eDMAv4.
 468          */
 469         if (((fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_CLEAR_DONE_E_SG) &&
 470                 (csr & EDMA_TCD_CSR_E_SG)) ||
 471             ((fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_CLEAR_DONE_E_LINK) &&
 472                 (csr & EDMA_TCD_CSR_E_LINK)))
 473                 edma_writel_chreg(fsl_chan, edma_readl_chreg(fsl_chan, ch_csr), ch_csr);
 474
 475
 476         edma_write_tcdreg(fsl_chan, tcd->csr, csr);
 477 }
 478
 479 static inline
 480 void fsl_edma_fill_tcd(struct fsl_edma_chan *fsl_chan,
 481                        struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
 482                        u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
 483                        u16 biter, u16 doff, u32 dlast_sga, bool major_int,
 484                        bool disable_req, bool enable_sg)
 485 {
 486         struct dma_slave_config *cfg = &fsl_chan->cfg;
 487         u16 csr = 0;
 488         u32 burst;
 489
 490         /*
 491          * eDMA hardware SGs require the TCDs to be stored in little
 492          * endian format irrespective of the register endian model.
 493          * So we put the value in little endian in memory, waiting
 494          * for fsl_edma_set_tcd_regs doing the swap.
 495          */
 496         tcd->saddr = cpu_to_le32(src);
 497         tcd->daddr = cpu_to_le32(dst);
 498
 499         tcd->attr = cpu_to_le16(attr);
 500
 501         tcd->soff = cpu_to_le16(soff);
 502
 503         if (fsl_chan->is_multi_fifo) {
 504                 /* set mloff to support multiple fifo */
 505                 burst = cfg->direction == DMA_DEV_TO_MEM ?
 506                                 cfg->src_addr_width : cfg->dst_addr_width;
 507                 nbytes |= EDMA_V3_TCD_NBYTES_MLOFF(-(burst * 4));
 508                 /* enable DMLOE/SMLOE */
 509                 if (cfg->direction == DMA_MEM_TO_DEV) {
 510                         nbytes |= EDMA_V3_TCD_NBYTES_DMLOE;
 511                         nbytes &= ~EDMA_V3_TCD_NBYTES_SMLOE;
 512                 } else {
 513                         nbytes |= EDMA_V3_TCD_NBYTES_SMLOE;
 514                         nbytes &= ~EDMA_V3_TCD_NBYTES_DMLOE;
 515                 }
 516         }
 517
 518         tcd->nbytes = cpu_to_le32(nbytes);
 519         tcd->slast = cpu_to_le32(slast);
 520
 521         tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
 522         tcd->doff = cpu_to_le16(doff);
 523
 524         tcd->dlast_sga = cpu_to_le32(dlast_sga);
 525
 526         tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
 527         if (major_int)
 528                 csr |= EDMA_TCD_CSR_INT_MAJOR;
 529
 530         if (disable_req)
 531                 csr |= EDMA_TCD_CSR_D_REQ;
 532
 533         if (enable_sg)
 534                 csr |= EDMA_TCD_CSR_E_SG;
 535
 536         if (fsl_chan->is_rxchan)
 537                 csr |= EDMA_TCD_CSR_ACTIVE;
 538
 539         if (fsl_chan->is_sw)
 540                 csr |= EDMA_TCD_CSR_START;
 541
 542         tcd->csr = cpu_to_le16(csr);
 543 }
 544
 545 static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
 546                 int sg_len)
 547 {
 548         struct fsl_edma_desc *fsl_desc;
 549         int i;
 550
 551         fsl_desc = kzalloc(struct_size(fsl_desc, tcd, sg_len), GFP_NOWAIT);
 552         if (!fsl_desc)
 553                 return NULL;
 554
 555         fsl_desc->echan = fsl_chan;
 556         fsl_desc->n_tcds = sg_len;
 557         for (i = 0; i < sg_len; i++) {
 558                 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
 559                                         GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
 560                 if (!fsl_desc->tcd[i].vtcd)
 561                         goto err;
 562         }
 563         return fsl_desc;
 564
 565 err:
 566         while (--i >= 0)
 567                 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
 568                                 fsl_desc->tcd[i].ptcd);
 569         kfree(fsl_desc);
 570         return NULL;
 571 }
 572
 573 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 574                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 575                 size_t period_len, enum dma_transfer_direction direction,
 576                 unsigned long flags)
 577 {
 578         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 579         struct fsl_edma_desc *fsl_desc;
 580         dma_addr_t dma_buf_next;
 581         bool major_int = true;
 582         int sg_len, i;
 583         u32 src_addr, dst_addr, last_sg, nbytes;
 584         u16 soff, doff, iter;
 585
 586         if (!is_slave_direction(direction))
 587                 return NULL;
 588
 589         if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
 590                 return NULL;
 591
 592         sg_len = buf_len / period_len;
 593         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 594         if (!fsl_desc)
 595                 return NULL;
 596         fsl_desc->iscyclic = true;
 597         fsl_desc->dirn = direction;
 598
 599         dma_buf_next = dma_addr;
 600         if (direction == DMA_MEM_TO_DEV) {
 601                 fsl_chan->attr =
 602                         fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
 603                 nbytes = fsl_chan->cfg.dst_addr_width *
 604                         fsl_chan->cfg.dst_maxburst;
 605         } else {
 606                 fsl_chan->attr =
 607                         fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
 608                 nbytes = fsl_chan->cfg.src_addr_width *
 609                         fsl_chan->cfg.src_maxburst;
 610         }
 611
 612         iter = period_len / nbytes;
 613
 614         for (i = 0; i < sg_len; i++) {
 615                 if (dma_buf_next >= dma_addr + buf_len)
 616                         dma_buf_next = dma_addr;
 617
 618                 /* get next sg's physical address */
 619                 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
 620
 621                 if (direction == DMA_MEM_TO_DEV) {
 622                         src_addr = dma_buf_next;
 623                         dst_addr = fsl_chan->dma_dev_addr;
 624                         soff = fsl_chan->cfg.dst_addr_width;
 625                         doff = fsl_chan->is_multi_fifo ? 4 : 0;
 626                 } else if (direction == DMA_DEV_TO_MEM) {
 627                         src_addr = fsl_chan->dma_dev_addr;
 628                         dst_addr = dma_buf_next;
 629                         soff = fsl_chan->is_multi_fifo ? 4 : 0;
 630                         doff = fsl_chan->cfg.src_addr_width;
 631                 } else {
 632                         /* DMA_DEV_TO_DEV */
 633                         src_addr = fsl_chan->cfg.src_addr;
 634                         dst_addr = fsl_chan->cfg.dst_addr;
 635                         soff = doff = 0;
 636                         major_int = false;
 637                 }
 638
 639                 fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
 640                                   fsl_chan->attr, soff, nbytes, 0, iter,
 641                                   iter, doff, last_sg, major_int, false, true);
 642                 dma_buf_next += period_len;
 643         }
 644
 645         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 646 }
 647
 648 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 649                 struct dma_chan *chan, struct scatterlist *sgl,
 650                 unsigned int sg_len, enum dma_transfer_direction direction,
 651                 unsigned long flags, void *context)
 652 {
 653         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 654         struct fsl_edma_desc *fsl_desc;
 655         struct scatterlist *sg;
 656         u32 src_addr, dst_addr, last_sg, nbytes;
 657         u16 soff, doff, iter;
 658         int i;
 659
 660         if (!is_slave_direction(direction))
 661                 return NULL;
 662
 663         if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
 664                 return NULL;
 665
 666         fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 667         if (!fsl_desc)
 668                 return NULL;
 669         fsl_desc->iscyclic = false;
 670         fsl_desc->dirn = direction;
 671
 672         if (direction == DMA_MEM_TO_DEV) {
 673                 fsl_chan->attr =
 674                         fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
 675                 nbytes = fsl_chan->cfg.dst_addr_width *
 676                         fsl_chan->cfg.dst_maxburst;
 677         } else {
 678                 fsl_chan->attr =
 679                         fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
 680                 nbytes = fsl_chan->cfg.src_addr_width *
 681                         fsl_chan->cfg.src_maxburst;
 682         }
 683
 684         for_each_sg(sgl, sg, sg_len, i) {
 685                 if (direction == DMA_MEM_TO_DEV) {
 686                         src_addr = sg_dma_address(sg);
 687                         dst_addr = fsl_chan->dma_dev_addr;
 688                         soff = fsl_chan->cfg.dst_addr_width;
 689                         doff = 0;
 690                 } else if (direction == DMA_DEV_TO_MEM) {
 691                         src_addr = fsl_chan->dma_dev_addr;
 692                         dst_addr = sg_dma_address(sg);
 693                         soff = 0;
 694                         doff = fsl_chan->cfg.src_addr_width;
 695                 } else {
 696                         /* DMA_DEV_TO_DEV */
 697                         src_addr = fsl_chan->cfg.src_addr;
 698                         dst_addr = fsl_chan->cfg.dst_addr;
 699                         soff = 0;
 700                         doff = 0;
 701                 }
 702
 703                 /*
 704                  * Choose the suitable burst length if sg_dma_len is not
 705                  * multiple of burst length so that the whole transfer length is
 706                  * multiple of minor loop(burst length).
 707                  */
 708                 if (sg_dma_len(sg) % nbytes) {
 709                         u32 width = (direction == DMA_DEV_TO_MEM) ? doff : soff;
 710                         u32 burst = (direction == DMA_DEV_TO_MEM) ?
 711                                                 fsl_chan->cfg.src_maxburst :
 712                                                 fsl_chan->cfg.dst_maxburst;
 713                         int j;
 714
 715                         for (j = burst; j > 1; j--) {
 716                                 if (!(sg_dma_len(sg) % (j * width))) {
 717                                         nbytes = j * width;
 718                                         break;
 719                                 }
 720                         }
 721                         /* Set burst size as 1 if there's no suitable one */
 722                         if (j == 1)
 723                                 nbytes = width;
 724                 }
 725                 iter = sg_dma_len(sg) / nbytes;
 726                 if (i < sg_len - 1) {
 727                         last_sg = fsl_desc->tcd[(i + 1)].ptcd;
 728                         fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr,
 729                                           dst_addr, fsl_chan->attr, soff,
 730                                           nbytes, 0, iter, iter, doff, last_sg,
 731                                           false, false, true);
 732                 } else {
 733                         last_sg = 0;
 734                         fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[i].vtcd, src_addr,
 735                                           dst_addr, fsl_chan->attr, soff,
 736                                           nbytes, 0, iter, iter, doff, last_sg,
 737                                           true, true, false);
 738                 }
 739         }
 740
 741         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 742 }
 743
 744 struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
 745                                                      dma_addr_t dma_dst, dma_addr_t dma_src,
 746                                                      size_t len, unsigned long flags)
 747 {
 748         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 749         struct fsl_edma_desc *fsl_desc;
 750
 751         fsl_desc = fsl_edma_alloc_desc(fsl_chan, 1);
 752         if (!fsl_desc)
 753                 return NULL;
 754         fsl_desc->iscyclic = false;
 755
 756         fsl_chan->is_sw = true;
 757
 758         /* To match with copy_align and max_seg_size so 1 tcd is enough */
 759         fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[0].vtcd, dma_src, dma_dst,
 760                         fsl_edma_get_tcd_attr(DMA_SLAVE_BUSWIDTH_32_BYTES),
 761                         32, len, 0, 1, 1, 32, 0, true, true, false);
 762
 763         return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
 764 }
 765
 766 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
 767 {
 768         struct virt_dma_desc *vdesc;
 769
 770         lockdep_assert_held(&fsl_chan->vchan.lock);
 771
 772         vdesc = vchan_next_desc(&fsl_chan->vchan);
 773         if (!vdesc)
 774                 return;
 775         fsl_chan->edesc = to_fsl_edma_desc(vdesc);
 776         fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
 777         fsl_edma_enable_request(fsl_chan);
 778         fsl_chan->status = DMA_IN_PROGRESS;
 779         fsl_chan->idle = false;
 780 }
 781
 782 void fsl_edma_issue_pending(struct dma_chan *chan)
 783 {
 784         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 785         unsigned long flags;
 786
 787         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 788
 789         if (unlikely(fsl_chan->pm_state != RUNNING)) {
 790                 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 791                 /* cannot submit due to suspend */
 792                 return;
 793         }
 794
 795         if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
 796                 fsl_edma_xfer_desc(fsl_chan);
 797
 798         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 799 }
 800
 801 int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 802 {
 803         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 804
 805         fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
 806                                 sizeof(struct fsl_edma_hw_tcd),
 807                                 32, 0);
 808         return 0;
 809 }
 810
 811 void fsl_edma_free_chan_resources(struct dma_chan *chan)
 812 {
 813         struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 814         struct fsl_edma_engine *edma = fsl_chan->edma;
 815         unsigned long flags;
 816         LIST_HEAD(head);
 817
 818         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 819         fsl_edma_disable_request(fsl_chan);
 820         if (edma->drvdata->dmamuxs)
 821                 fsl_edma_chan_mux(fsl_chan, 0, false);
 822         fsl_chan->edesc = NULL;
 823         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
 824         fsl_edma_unprep_slave_dma(fsl_chan);
 825         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 826
 827         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
 828         dma_pool_destroy(fsl_chan->tcd_pool);
 829         fsl_chan->tcd_pool = NULL;
 830         fsl_chan->is_sw = false;
 831         fsl_chan->srcid = 0;
 832 }
 833
 834 void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
 835 {
 836         struct fsl_edma_chan *chan, *_chan;
 837
 838         list_for_each_entry_safe(chan, _chan,
 839                                 &dmadev->channels, vchan.chan.device_node) {
 840                 list_del(&chan->vchan.chan.device_node);
 841                 tasklet_kill(&chan->vchan.task);
 842         }
 843 }
 844
 845 /*
 846  * On the 32 channels Vybrid/mpc577x edma version, register offsets are
 847  * different compared to ColdFire mcf5441x 64 channels edma.
 848  *
 849  * This function sets up register offsets as per proper declared version
 850  * so must be called in xxx_edma_probe() just after setting the
 851  * edma "version" and "membase" appropriately.
 852  */
 853 void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
 854 {
 855         bool is64 = !!(edma->drvdata->flags & FSL_EDMA_DRV_EDMA64);
 856
 857         edma->regs.cr = edma->membase + EDMA_CR;
 858         edma->regs.es = edma->membase + EDMA_ES;
 859         edma->regs.erql = edma->membase + EDMA_ERQ;
 860         edma->regs.eeil = edma->membase + EDMA_EEI;
 861
 862         edma->regs.serq = edma->membase + (is64 ? EDMA64_SERQ : EDMA_SERQ);
 863         edma->regs.cerq = edma->membase + (is64 ? EDMA64_CERQ : EDMA_CERQ);
 864         edma->regs.seei = edma->membase + (is64 ? EDMA64_SEEI : EDMA_SEEI);
 865         edma->regs.ceei = edma->membase + (is64 ? EDMA64_CEEI : EDMA_CEEI);
 866         edma->regs.cint = edma->membase + (is64 ? EDMA64_CINT : EDMA_CINT);
 867         edma->regs.cerr = edma->membase + (is64 ? EDMA64_CERR : EDMA_CERR);
 868         edma->regs.ssrt = edma->membase + (is64 ? EDMA64_SSRT : EDMA_SSRT);
 869         edma->regs.cdne = edma->membase + (is64 ? EDMA64_CDNE : EDMA_CDNE);
 870         edma->regs.intl = edma->membase + (is64 ? EDMA64_INTL : EDMA_INTR);
 871         edma->regs.errl = edma->membase + (is64 ? EDMA64_ERRL : EDMA_ERR);
 872
 873         if (is64) {
 874                 edma->regs.erqh = edma->membase + EDMA64_ERQH;
 875                 edma->regs.eeih = edma->membase + EDMA64_EEIH;
 876                 edma->regs.errh = edma->membase + EDMA64_ERRH;
 877                 edma->regs.inth = edma->membase + EDMA64_INTH;
 878         }
 879 }
 880
 881 MODULE_LICENSE("GPL v2");