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 } 832 833 void fsl_edma_cleanup_vchan(struct dma_device *dmadev) 834 { 835 struct fsl_edma_chan *chan, *_chan; 836 837 list_for_each_entry_safe(chan, _chan, 838 &dmadev->channels, vchan.chan.device_node) { 839 list_del(&chan->vchan.chan.device_node); 840 tasklet_kill(&chan->vchan.task); 841 } 842 } 843 844 /* 845 * On the 32 channels Vybrid/mpc577x edma version, register offsets are 846 * different compared to ColdFire mcf5441x 64 channels edma. 847 * 848 * This function sets up register offsets as per proper declared version 849 * so must be called in xxx_edma_probe() just after setting the 850 * edma "version" and "membase" appropriately. 851 */ 852 void fsl_edma_setup_regs(struct fsl_edma_engine *edma) 853 { 854 bool is64 = !!(edma->drvdata->flags & FSL_EDMA_DRV_EDMA64); 855 856 edma->regs.cr = edma->membase + EDMA_CR; 857 edma->regs.es = edma->membase + EDMA_ES; 858 edma->regs.erql = edma->membase + EDMA_ERQ; 859 edma->regs.eeil = edma->membase + EDMA_EEI; 860 861 edma->regs.serq = edma->membase + (is64 ? EDMA64_SERQ : EDMA_SERQ); 862 edma->regs.cerq = edma->membase + (is64 ? EDMA64_CERQ : EDMA_CERQ); 863 edma->regs.seei = edma->membase + (is64 ? EDMA64_SEEI : EDMA_SEEI); 864 edma->regs.ceei = edma->membase + (is64 ? EDMA64_CEEI : EDMA_CEEI); 865 edma->regs.cint = edma->membase + (is64 ? EDMA64_CINT : EDMA_CINT); 866 edma->regs.cerr = edma->membase + (is64 ? EDMA64_CERR : EDMA_CERR); 867 edma->regs.ssrt = edma->membase + (is64 ? EDMA64_SSRT : EDMA_SSRT); 868 edma->regs.cdne = edma->membase + (is64 ? EDMA64_CDNE : EDMA_CDNE); 869 edma->regs.intl = edma->membase + (is64 ? EDMA64_INTL : EDMA_INTR); 870 edma->regs.errl = edma->membase + (is64 ? EDMA64_ERRL : EDMA_ERR); 871 872 if (is64) { 873 edma->regs.erqh = edma->membase + EDMA64_ERQH; 874 edma->regs.eeih = edma->membase + EDMA64_EEIH; 875 edma->regs.errh = edma->membase + EDMA64_ERRH; 876 edma->regs.inth = edma->membase + EDMA64_INTH; 877 } 878 } 879 880 MODULE_LICENSE("GPL v2"); 881