1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver For Marvell Two-channel DMA Engine 4 * 5 * Copyright: Marvell International Ltd. 6 */ 7 8 #include <linux/err.h> 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/types.h> 12 #include <linux/interrupt.h> 13 #include <linux/dma-mapping.h> 14 #include <linux/slab.h> 15 #include <linux/dmaengine.h> 16 #include <linux/platform_device.h> 17 #include <linux/device.h> 18 #include <linux/genalloc.h> 19 #include <linux/of_device.h> 20 #include <linux/of_dma.h> 21 22 #include "dmaengine.h" 23 24 /* 25 * Two-Channel DMA registers 26 */ 27 #define TDBCR 0x00 /* Byte Count */ 28 #define TDSAR 0x10 /* Src Addr */ 29 #define TDDAR 0x20 /* Dst Addr */ 30 #define TDNDPR 0x30 /* Next Desc */ 31 #define TDCR 0x40 /* Control */ 32 #define TDCP 0x60 /* Priority*/ 33 #define TDCDPR 0x70 /* Current Desc */ 34 #define TDIMR 0x80 /* Int Mask */ 35 #define TDISR 0xa0 /* Int Status */ 36 37 /* Two-Channel DMA Control Register */ 38 #define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */ 39 #define TDCR_SSZ_12_BITS (0x1 << 22) 40 #define TDCR_SSZ_16_BITS (0x2 << 22) 41 #define TDCR_SSZ_20_BITS (0x3 << 22) 42 #define TDCR_SSZ_24_BITS (0x4 << 22) 43 #define TDCR_SSZ_32_BITS (0x5 << 22) 44 #define TDCR_SSZ_SHIFT (0x1 << 22) 45 #define TDCR_SSZ_MASK (0x7 << 22) 46 #define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */ 47 #define TDCR_ABR (0x1 << 20) /* Channel Abort */ 48 #define TDCR_CDE (0x1 << 17) /* Close Desc Enable */ 49 #define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */ 50 #define TDCR_CHANACT (0x1 << 14) /* Channel Active */ 51 #define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */ 52 #define TDCR_CHANEN (0x1 << 12) /* Channel Enable */ 53 #define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */ 54 #define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */ 55 #define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */ 56 #define TDCR_BURSTSZ_4B (0x0 << 6) 57 #define TDCR_BURSTSZ_8B (0x1 << 6) 58 #define TDCR_BURSTSZ_16B (0x3 << 6) 59 #define TDCR_BURSTSZ_32B (0x6 << 6) 60 #define TDCR_BURSTSZ_64B (0x7 << 6) 61 #define TDCR_BURSTSZ_SQU_1B (0x5 << 6) 62 #define TDCR_BURSTSZ_SQU_2B (0x6 << 6) 63 #define TDCR_BURSTSZ_SQU_4B (0x0 << 6) 64 #define TDCR_BURSTSZ_SQU_8B (0x1 << 6) 65 #define TDCR_BURSTSZ_SQU_16B (0x3 << 6) 66 #define TDCR_BURSTSZ_SQU_32B (0x7 << 6) 67 #define TDCR_BURSTSZ_128B (0x5 << 6) 68 #define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */ 69 #define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */ 70 #define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */ 71 #define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */ 72 #define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */ 73 #define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */ 74 #define TDCR_DSTDESCCONT (0x1 << 1) 75 #define TDCR_SRCDESTCONT (0x1 << 0) 76 77 /* Two-Channel DMA Int Mask Register */ 78 #define TDIMR_COMP (0x1 << 0) 79 80 /* Two-Channel DMA Int Status Register */ 81 #define TDISR_COMP (0x1 << 0) 82 83 /* 84 * Two-Channel DMA Descriptor Struct 85 * NOTE: desc's buf must be aligned to 16 bytes. 86 */ 87 struct mmp_tdma_desc { 88 u32 byte_cnt; 89 u32 src_addr; 90 u32 dst_addr; 91 u32 nxt_desc; 92 }; 93 94 enum mmp_tdma_type { 95 MMP_AUD_TDMA = 0, 96 PXA910_SQU, 97 }; 98 99 #define TDMA_MAX_XFER_BYTES SZ_64K 100 101 struct mmp_tdma_chan { 102 struct device *dev; 103 struct dma_chan chan; 104 struct dma_async_tx_descriptor desc; 105 struct tasklet_struct tasklet; 106 107 struct mmp_tdma_desc *desc_arr; 108 dma_addr_t desc_arr_phys; 109 int desc_num; 110 enum dma_transfer_direction dir; 111 dma_addr_t dev_addr; 112 u32 burst_sz; 113 enum dma_slave_buswidth buswidth; 114 enum dma_status status; 115 struct dma_slave_config slave_config; 116 117 int idx; 118 enum mmp_tdma_type type; 119 int irq; 120 void __iomem *reg_base; 121 122 size_t buf_len; 123 size_t period_len; 124 size_t pos; 125 126 struct gen_pool *pool; 127 }; 128 129 #define TDMA_CHANNEL_NUM 2 130 struct mmp_tdma_device { 131 struct device *dev; 132 void __iomem *base; 133 struct dma_device device; 134 struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM]; 135 }; 136 137 #define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan) 138 139 static int mmp_tdma_config_write(struct dma_chan *chan, 140 enum dma_transfer_direction dir, 141 struct dma_slave_config *dmaengine_cfg); 142 143 static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys) 144 { 145 writel(phys, tdmac->reg_base + TDNDPR); 146 writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND, 147 tdmac->reg_base + TDCR); 148 } 149 150 static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable) 151 { 152 if (enable) 153 writel(TDIMR_COMP, tdmac->reg_base + TDIMR); 154 else 155 writel(0, tdmac->reg_base + TDIMR); 156 } 157 158 static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac) 159 { 160 /* enable dma chan */ 161 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN, 162 tdmac->reg_base + TDCR); 163 tdmac->status = DMA_IN_PROGRESS; 164 } 165 166 static int mmp_tdma_disable_chan(struct dma_chan *chan) 167 { 168 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 169 u32 tdcr; 170 171 tdcr = readl(tdmac->reg_base + TDCR); 172 tdcr |= TDCR_ABR; 173 tdcr &= ~TDCR_CHANEN; 174 writel(tdcr, tdmac->reg_base + TDCR); 175 176 tdmac->status = DMA_COMPLETE; 177 178 return 0; 179 } 180 181 static int mmp_tdma_resume_chan(struct dma_chan *chan) 182 { 183 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 184 185 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN, 186 tdmac->reg_base + TDCR); 187 tdmac->status = DMA_IN_PROGRESS; 188 189 return 0; 190 } 191 192 static int mmp_tdma_pause_chan(struct dma_chan *chan) 193 { 194 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 195 196 writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN, 197 tdmac->reg_base + TDCR); 198 tdmac->status = DMA_PAUSED; 199 200 return 0; 201 } 202 203 static int mmp_tdma_config_chan(struct dma_chan *chan) 204 { 205 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 206 unsigned int tdcr = 0; 207 208 mmp_tdma_disable_chan(chan); 209 210 if (tdmac->dir == DMA_MEM_TO_DEV) 211 tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC; 212 else if (tdmac->dir == DMA_DEV_TO_MEM) 213 tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC; 214 215 if (tdmac->type == MMP_AUD_TDMA) { 216 tdcr |= TDCR_PACKMOD; 217 218 switch (tdmac->burst_sz) { 219 case 4: 220 tdcr |= TDCR_BURSTSZ_4B; 221 break; 222 case 8: 223 tdcr |= TDCR_BURSTSZ_8B; 224 break; 225 case 16: 226 tdcr |= TDCR_BURSTSZ_16B; 227 break; 228 case 32: 229 tdcr |= TDCR_BURSTSZ_32B; 230 break; 231 case 64: 232 tdcr |= TDCR_BURSTSZ_64B; 233 break; 234 case 128: 235 tdcr |= TDCR_BURSTSZ_128B; 236 break; 237 default: 238 dev_err(tdmac->dev, "unknown burst size.\n"); 239 return -EINVAL; 240 } 241 242 switch (tdmac->buswidth) { 243 case DMA_SLAVE_BUSWIDTH_1_BYTE: 244 tdcr |= TDCR_SSZ_8_BITS; 245 break; 246 case DMA_SLAVE_BUSWIDTH_2_BYTES: 247 tdcr |= TDCR_SSZ_16_BITS; 248 break; 249 case DMA_SLAVE_BUSWIDTH_4_BYTES: 250 tdcr |= TDCR_SSZ_32_BITS; 251 break; 252 default: 253 dev_err(tdmac->dev, "unknown bus size.\n"); 254 return -EINVAL; 255 } 256 } else if (tdmac->type == PXA910_SQU) { 257 tdcr |= TDCR_SSPMOD; 258 259 switch (tdmac->burst_sz) { 260 case 1: 261 tdcr |= TDCR_BURSTSZ_SQU_1B; 262 break; 263 case 2: 264 tdcr |= TDCR_BURSTSZ_SQU_2B; 265 break; 266 case 4: 267 tdcr |= TDCR_BURSTSZ_SQU_4B; 268 break; 269 case 8: 270 tdcr |= TDCR_BURSTSZ_SQU_8B; 271 break; 272 case 16: 273 tdcr |= TDCR_BURSTSZ_SQU_16B; 274 break; 275 case 32: 276 tdcr |= TDCR_BURSTSZ_SQU_32B; 277 break; 278 default: 279 dev_err(tdmac->dev, "unknown burst size.\n"); 280 return -EINVAL; 281 } 282 } 283 284 writel(tdcr, tdmac->reg_base + TDCR); 285 return 0; 286 } 287 288 static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac) 289 { 290 u32 reg = readl(tdmac->reg_base + TDISR); 291 292 if (reg & TDISR_COMP) { 293 /* clear irq */ 294 reg &= ~TDISR_COMP; 295 writel(reg, tdmac->reg_base + TDISR); 296 297 return 0; 298 } 299 return -EAGAIN; 300 } 301 302 static size_t mmp_tdma_get_pos(struct mmp_tdma_chan *tdmac) 303 { 304 size_t reg; 305 306 if (tdmac->idx == 0) { 307 reg = __raw_readl(tdmac->reg_base + TDSAR); 308 reg -= tdmac->desc_arr[0].src_addr; 309 } else if (tdmac->idx == 1) { 310 reg = __raw_readl(tdmac->reg_base + TDDAR); 311 reg -= tdmac->desc_arr[0].dst_addr; 312 } else 313 return -EINVAL; 314 315 return reg; 316 } 317 318 static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id) 319 { 320 struct mmp_tdma_chan *tdmac = dev_id; 321 322 if (mmp_tdma_clear_chan_irq(tdmac) == 0) { 323 tasklet_schedule(&tdmac->tasklet); 324 return IRQ_HANDLED; 325 } else 326 return IRQ_NONE; 327 } 328 329 static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id) 330 { 331 struct mmp_tdma_device *tdev = dev_id; 332 int i, ret; 333 int irq_num = 0; 334 335 for (i = 0; i < TDMA_CHANNEL_NUM; i++) { 336 struct mmp_tdma_chan *tdmac = tdev->tdmac[i]; 337 338 ret = mmp_tdma_chan_handler(irq, tdmac); 339 if (ret == IRQ_HANDLED) 340 irq_num++; 341 } 342 343 if (irq_num) 344 return IRQ_HANDLED; 345 else 346 return IRQ_NONE; 347 } 348 349 static void dma_do_tasklet(struct tasklet_struct *t) 350 { 351 struct mmp_tdma_chan *tdmac = from_tasklet(tdmac, t, tasklet); 352 353 dmaengine_desc_get_callback_invoke(&tdmac->desc, NULL); 354 } 355 356 static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac) 357 { 358 struct gen_pool *gpool; 359 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc); 360 361 gpool = tdmac->pool; 362 if (gpool && tdmac->desc_arr) 363 gen_pool_free(gpool, (unsigned long)tdmac->desc_arr, 364 size); 365 tdmac->desc_arr = NULL; 366 if (tdmac->status == DMA_ERROR) 367 tdmac->status = DMA_COMPLETE; 368 369 return; 370 } 371 372 static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx) 373 { 374 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan); 375 376 mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys); 377 378 return 0; 379 } 380 381 static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan) 382 { 383 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 384 int ret; 385 386 dma_async_tx_descriptor_init(&tdmac->desc, chan); 387 tdmac->desc.tx_submit = mmp_tdma_tx_submit; 388 389 if (tdmac->irq) { 390 ret = devm_request_irq(tdmac->dev, tdmac->irq, 391 mmp_tdma_chan_handler, 0, "tdma", tdmac); 392 if (ret) 393 return ret; 394 } 395 return 1; 396 } 397 398 static void mmp_tdma_free_chan_resources(struct dma_chan *chan) 399 { 400 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 401 402 if (tdmac->irq) 403 devm_free_irq(tdmac->dev, tdmac->irq, tdmac); 404 mmp_tdma_free_descriptor(tdmac); 405 return; 406 } 407 408 static struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac) 409 { 410 struct gen_pool *gpool; 411 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc); 412 413 gpool = tdmac->pool; 414 if (!gpool) 415 return NULL; 416 417 tdmac->desc_arr = gen_pool_dma_alloc(gpool, size, &tdmac->desc_arr_phys); 418 419 return tdmac->desc_arr; 420 } 421 422 static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic( 423 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 424 size_t period_len, enum dma_transfer_direction direction, 425 unsigned long flags) 426 { 427 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 428 struct mmp_tdma_desc *desc; 429 int num_periods = buf_len / period_len; 430 int i = 0, buf = 0; 431 432 if (!is_slave_direction(direction)) { 433 dev_err(tdmac->dev, "unsupported transfer direction\n"); 434 return NULL; 435 } 436 437 if (tdmac->status != DMA_COMPLETE) { 438 dev_err(tdmac->dev, "controller busy"); 439 return NULL; 440 } 441 442 if (period_len > TDMA_MAX_XFER_BYTES) { 443 dev_err(tdmac->dev, 444 "maximum period size exceeded: %zu > %d\n", 445 period_len, TDMA_MAX_XFER_BYTES); 446 goto err_out; 447 } 448 449 tdmac->status = DMA_IN_PROGRESS; 450 tdmac->desc_num = num_periods; 451 desc = mmp_tdma_alloc_descriptor(tdmac); 452 if (!desc) 453 goto err_out; 454 455 if (mmp_tdma_config_write(chan, direction, &tdmac->slave_config)) 456 goto err_out; 457 458 while (buf < buf_len) { 459 desc = &tdmac->desc_arr[i]; 460 461 if (i + 1 == num_periods) 462 desc->nxt_desc = tdmac->desc_arr_phys; 463 else 464 desc->nxt_desc = tdmac->desc_arr_phys + 465 sizeof(*desc) * (i + 1); 466 467 if (direction == DMA_MEM_TO_DEV) { 468 desc->src_addr = dma_addr; 469 desc->dst_addr = tdmac->dev_addr; 470 } else { 471 desc->src_addr = tdmac->dev_addr; 472 desc->dst_addr = dma_addr; 473 } 474 desc->byte_cnt = period_len; 475 dma_addr += period_len; 476 buf += period_len; 477 i++; 478 } 479 480 /* enable interrupt */ 481 if (flags & DMA_PREP_INTERRUPT) 482 mmp_tdma_enable_irq(tdmac, true); 483 484 tdmac->buf_len = buf_len; 485 tdmac->period_len = period_len; 486 tdmac->pos = 0; 487 488 return &tdmac->desc; 489 490 err_out: 491 tdmac->status = DMA_ERROR; 492 return NULL; 493 } 494 495 static int mmp_tdma_terminate_all(struct dma_chan *chan) 496 { 497 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 498 499 mmp_tdma_disable_chan(chan); 500 /* disable interrupt */ 501 mmp_tdma_enable_irq(tdmac, false); 502 503 return 0; 504 } 505 506 static int mmp_tdma_config(struct dma_chan *chan, 507 struct dma_slave_config *dmaengine_cfg) 508 { 509 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 510 511 memcpy(&tdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg)); 512 513 return 0; 514 } 515 516 static int mmp_tdma_config_write(struct dma_chan *chan, 517 enum dma_transfer_direction dir, 518 struct dma_slave_config *dmaengine_cfg) 519 { 520 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 521 522 if (dir == DMA_DEV_TO_MEM) { 523 tdmac->dev_addr = dmaengine_cfg->src_addr; 524 tdmac->burst_sz = dmaengine_cfg->src_maxburst; 525 tdmac->buswidth = dmaengine_cfg->src_addr_width; 526 } else { 527 tdmac->dev_addr = dmaengine_cfg->dst_addr; 528 tdmac->burst_sz = dmaengine_cfg->dst_maxburst; 529 tdmac->buswidth = dmaengine_cfg->dst_addr_width; 530 } 531 tdmac->dir = dir; 532 533 return mmp_tdma_config_chan(chan); 534 } 535 536 static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan, 537 dma_cookie_t cookie, struct dma_tx_state *txstate) 538 { 539 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 540 541 tdmac->pos = mmp_tdma_get_pos(tdmac); 542 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, 543 tdmac->buf_len - tdmac->pos); 544 545 return tdmac->status; 546 } 547 548 static void mmp_tdma_issue_pending(struct dma_chan *chan) 549 { 550 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); 551 552 mmp_tdma_enable_chan(tdmac); 553 } 554 555 static int mmp_tdma_remove(struct platform_device *pdev) 556 { 557 if (pdev->dev.of_node) 558 of_dma_controller_free(pdev->dev.of_node); 559 560 return 0; 561 } 562 563 static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev, 564 int idx, int irq, 565 int type, struct gen_pool *pool) 566 { 567 struct mmp_tdma_chan *tdmac; 568 569 if (idx >= TDMA_CHANNEL_NUM) { 570 dev_err(tdev->dev, "too many channels for device!\n"); 571 return -EINVAL; 572 } 573 574 /* alloc channel */ 575 tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL); 576 if (!tdmac) 577 return -ENOMEM; 578 579 if (irq) 580 tdmac->irq = irq; 581 tdmac->dev = tdev->dev; 582 tdmac->chan.device = &tdev->device; 583 tdmac->idx = idx; 584 tdmac->type = type; 585 tdmac->reg_base = tdev->base + idx * 4; 586 tdmac->pool = pool; 587 tdmac->status = DMA_COMPLETE; 588 tdev->tdmac[tdmac->idx] = tdmac; 589 tasklet_setup(&tdmac->tasklet, dma_do_tasklet); 590 591 /* add the channel to tdma_chan list */ 592 list_add_tail(&tdmac->chan.device_node, 593 &tdev->device.channels); 594 return 0; 595 } 596 597 struct mmp_tdma_filter_param { 598 unsigned int chan_id; 599 }; 600 601 static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param) 602 { 603 struct mmp_tdma_filter_param *param = fn_param; 604 605 if (chan->chan_id != param->chan_id) 606 return false; 607 608 return true; 609 } 610 611 static struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec, 612 struct of_dma *ofdma) 613 { 614 struct mmp_tdma_device *tdev = ofdma->of_dma_data; 615 dma_cap_mask_t mask = tdev->device.cap_mask; 616 struct mmp_tdma_filter_param param; 617 618 if (dma_spec->args_count != 1) 619 return NULL; 620 621 param.chan_id = dma_spec->args[0]; 622 623 if (param.chan_id >= TDMA_CHANNEL_NUM) 624 return NULL; 625 626 return __dma_request_channel(&mask, mmp_tdma_filter_fn, ¶m, 627 ofdma->of_node); 628 } 629 630 static const struct of_device_id mmp_tdma_dt_ids[] = { 631 { .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA}, 632 { .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU}, 633 {} 634 }; 635 MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids); 636 637 static int mmp_tdma_probe(struct platform_device *pdev) 638 { 639 enum mmp_tdma_type type; 640 const struct of_device_id *of_id; 641 struct mmp_tdma_device *tdev; 642 int i, ret; 643 int irq = 0, irq_num = 0; 644 int chan_num = TDMA_CHANNEL_NUM; 645 struct gen_pool *pool = NULL; 646 647 of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev); 648 if (of_id) 649 type = (enum mmp_tdma_type) of_id->data; 650 else 651 type = platform_get_device_id(pdev)->driver_data; 652 653 /* always have couple channels */ 654 tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL); 655 if (!tdev) 656 return -ENOMEM; 657 658 tdev->dev = &pdev->dev; 659 660 for (i = 0; i < chan_num; i++) { 661 if (platform_get_irq(pdev, i) > 0) 662 irq_num++; 663 } 664 665 tdev->base = devm_platform_ioremap_resource(pdev, 0); 666 if (IS_ERR(tdev->base)) 667 return PTR_ERR(tdev->base); 668 669 INIT_LIST_HEAD(&tdev->device.channels); 670 671 pool = of_gen_pool_get(pdev->dev.of_node, "asram", 0); 672 if (!pool) { 673 dev_err(&pdev->dev, "asram pool not available\n"); 674 return -ENOMEM; 675 } 676 677 if (irq_num != chan_num) { 678 irq = platform_get_irq(pdev, 0); 679 ret = devm_request_irq(&pdev->dev, irq, 680 mmp_tdma_int_handler, IRQF_SHARED, "tdma", tdev); 681 if (ret) 682 return ret; 683 } 684 685 /* initialize channel parameters */ 686 for (i = 0; i < chan_num; i++) { 687 irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i); 688 ret = mmp_tdma_chan_init(tdev, i, irq, type, pool); 689 if (ret) 690 return ret; 691 } 692 693 dma_cap_set(DMA_SLAVE, tdev->device.cap_mask); 694 dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask); 695 tdev->device.dev = &pdev->dev; 696 tdev->device.device_alloc_chan_resources = 697 mmp_tdma_alloc_chan_resources; 698 tdev->device.device_free_chan_resources = 699 mmp_tdma_free_chan_resources; 700 tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic; 701 tdev->device.device_tx_status = mmp_tdma_tx_status; 702 tdev->device.device_issue_pending = mmp_tdma_issue_pending; 703 tdev->device.device_config = mmp_tdma_config; 704 tdev->device.device_pause = mmp_tdma_pause_chan; 705 tdev->device.device_resume = mmp_tdma_resume_chan; 706 tdev->device.device_terminate_all = mmp_tdma_terminate_all; 707 tdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES; 708 709 tdev->device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); 710 if (type == MMP_AUD_TDMA) { 711 tdev->device.max_burst = SZ_128; 712 tdev->device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 713 tdev->device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 714 } else if (type == PXA910_SQU) { 715 tdev->device.max_burst = SZ_32; 716 } 717 tdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; 718 tdev->device.descriptor_reuse = true; 719 720 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); 721 platform_set_drvdata(pdev, tdev); 722 723 ret = dmaenginem_async_device_register(&tdev->device); 724 if (ret) { 725 dev_err(tdev->device.dev, "unable to register\n"); 726 return ret; 727 } 728 729 if (pdev->dev.of_node) { 730 ret = of_dma_controller_register(pdev->dev.of_node, 731 mmp_tdma_xlate, tdev); 732 if (ret) { 733 dev_err(tdev->device.dev, 734 "failed to register controller\n"); 735 return ret; 736 } 737 } 738 739 dev_info(tdev->device.dev, "initialized\n"); 740 return 0; 741 } 742 743 static const struct platform_device_id mmp_tdma_id_table[] = { 744 { "mmp-adma", MMP_AUD_TDMA }, 745 { "pxa910-squ", PXA910_SQU }, 746 { }, 747 }; 748 749 static struct platform_driver mmp_tdma_driver = { 750 .driver = { 751 .name = "mmp-tdma", 752 .of_match_table = mmp_tdma_dt_ids, 753 }, 754 .id_table = mmp_tdma_id_table, 755 .probe = mmp_tdma_probe, 756 .remove = mmp_tdma_remove, 757 }; 758 759 module_platform_driver(mmp_tdma_driver); 760 761 MODULE_LICENSE("GPL"); 762 MODULE_DESCRIPTION("MMP Two-Channel DMA Driver"); 763 MODULE_ALIAS("platform:mmp-tdma"); 764 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>"); 765 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>"); 766