1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ADMA driver for Nvidia's Tegra210 ADMA controller. 4 * 5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/iopoll.h> 10 #include <linux/module.h> 11 #include <linux/of_device.h> 12 #include <linux/of_dma.h> 13 #include <linux/of_irq.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/slab.h> 16 17 #include "virt-dma.h" 18 19 #define ADMA_CH_CMD 0x00 20 #define ADMA_CH_STATUS 0x0c 21 #define ADMA_CH_STATUS_XFER_EN BIT(0) 22 #define ADMA_CH_STATUS_XFER_PAUSED BIT(1) 23 24 #define ADMA_CH_INT_STATUS 0x10 25 #define ADMA_CH_INT_STATUS_XFER_DONE BIT(0) 26 27 #define ADMA_CH_INT_CLEAR 0x1c 28 #define ADMA_CH_CTRL 0x24 29 #define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12) 30 #define ADMA_CH_CTRL_DIR_AHUB2MEM 2 31 #define ADMA_CH_CTRL_DIR_MEM2AHUB 4 32 #define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8) 33 #define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1) 34 #define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0 35 36 #define ADMA_CH_CONFIG 0x28 37 #define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28) 38 #define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24) 39 #define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20 40 #define ADMA_CH_CONFIG_MAX_BURST_SIZE 16 41 #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf) 42 #define ADMA_CH_CONFIG_MAX_BUFS 8 43 #define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4) 44 45 #define ADMA_CH_FIFO_CTRL 0x2c 46 #define TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0xf) << 8) 47 #define TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0xf) 48 #define TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0x1f) << 8) 49 #define TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0x1f) 50 51 #define ADMA_CH_LOWER_SRC_ADDR 0x34 52 #define ADMA_CH_LOWER_TRG_ADDR 0x3c 53 #define ADMA_CH_TC 0x44 54 #define ADMA_CH_TC_COUNT_MASK 0x3ffffffc 55 56 #define ADMA_CH_XFER_STATUS 0x54 57 #define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff 58 59 #define ADMA_GLOBAL_CMD 0x00 60 #define ADMA_GLOBAL_SOFT_RESET 0x04 61 62 #define TEGRA_ADMA_BURST_COMPLETE_TIME 20 63 64 #define TEGRA210_FIFO_CTRL_DEFAULT (TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \ 65 TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(3)) 66 67 #define TEGRA186_FIFO_CTRL_DEFAULT (TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \ 68 TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(3)) 69 70 #define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift) 71 72 struct tegra_adma; 73 74 /* 75 * struct tegra_adma_chip_data - Tegra chip specific data 76 * @global_reg_offset: Register offset of DMA global register. 77 * @global_int_clear: Register offset of DMA global interrupt clear. 78 * @ch_req_tx_shift: Register offset for AHUB transmit channel select. 79 * @ch_req_rx_shift: Register offset for AHUB receive channel select. 80 * @ch_base_offset: Register offset of DMA channel registers. 81 * @has_outstanding_reqs: If DMA channel can have outstanding requests. 82 * @ch_fifo_ctrl: Default value for channel FIFO CTRL register. 83 * @ch_req_mask: Mask for Tx or Rx channel select. 84 * @ch_req_max: Maximum number of Tx or Rx channels available. 85 * @ch_reg_size: Size of DMA channel register space. 86 * @nr_channels: Number of DMA channels available. 87 */ 88 struct tegra_adma_chip_data { 89 unsigned int (*adma_get_burst_config)(unsigned int burst_size); 90 unsigned int global_reg_offset; 91 unsigned int global_int_clear; 92 unsigned int ch_req_tx_shift; 93 unsigned int ch_req_rx_shift; 94 unsigned int ch_base_offset; 95 unsigned int ch_fifo_ctrl; 96 unsigned int ch_req_mask; 97 unsigned int ch_req_max; 98 unsigned int ch_reg_size; 99 unsigned int nr_channels; 100 bool has_outstanding_reqs; 101 }; 102 103 /* 104 * struct tegra_adma_chan_regs - Tegra ADMA channel registers 105 */ 106 struct tegra_adma_chan_regs { 107 unsigned int ctrl; 108 unsigned int config; 109 unsigned int src_addr; 110 unsigned int trg_addr; 111 unsigned int fifo_ctrl; 112 unsigned int cmd; 113 unsigned int tc; 114 }; 115 116 /* 117 * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests. 118 */ 119 struct tegra_adma_desc { 120 struct virt_dma_desc vd; 121 struct tegra_adma_chan_regs ch_regs; 122 size_t buf_len; 123 size_t period_len; 124 size_t num_periods; 125 }; 126 127 /* 128 * struct tegra_adma_chan - Tegra ADMA channel information 129 */ 130 struct tegra_adma_chan { 131 struct virt_dma_chan vc; 132 struct tegra_adma_desc *desc; 133 struct tegra_adma *tdma; 134 int irq; 135 void __iomem *chan_addr; 136 137 /* Slave channel configuration info */ 138 struct dma_slave_config sconfig; 139 enum dma_transfer_direction sreq_dir; 140 unsigned int sreq_index; 141 bool sreq_reserved; 142 struct tegra_adma_chan_regs ch_regs; 143 144 /* Transfer count and position info */ 145 unsigned int tx_buf_count; 146 unsigned int tx_buf_pos; 147 }; 148 149 /* 150 * struct tegra_adma - Tegra ADMA controller information 151 */ 152 struct tegra_adma { 153 struct dma_device dma_dev; 154 struct device *dev; 155 void __iomem *base_addr; 156 struct clk *ahub_clk; 157 unsigned int nr_channels; 158 unsigned long rx_requests_reserved; 159 unsigned long tx_requests_reserved; 160 161 /* Used to store global command register state when suspending */ 162 unsigned int global_cmd; 163 164 const struct tegra_adma_chip_data *cdata; 165 166 /* Last member of the structure */ 167 struct tegra_adma_chan channels[]; 168 }; 169 170 static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val) 171 { 172 writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg); 173 } 174 175 static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg) 176 { 177 return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg); 178 } 179 180 static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val) 181 { 182 writel(val, tdc->chan_addr + reg); 183 } 184 185 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg) 186 { 187 return readl(tdc->chan_addr + reg); 188 } 189 190 static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc) 191 { 192 return container_of(dc, struct tegra_adma_chan, vc.chan); 193 } 194 195 static inline struct tegra_adma_desc *to_tegra_adma_desc( 196 struct dma_async_tx_descriptor *td) 197 { 198 return container_of(td, struct tegra_adma_desc, vd.tx); 199 } 200 201 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc) 202 { 203 return tdc->tdma->dev; 204 } 205 206 static void tegra_adma_desc_free(struct virt_dma_desc *vd) 207 { 208 kfree(container_of(vd, struct tegra_adma_desc, vd)); 209 } 210 211 static int tegra_adma_slave_config(struct dma_chan *dc, 212 struct dma_slave_config *sconfig) 213 { 214 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 215 216 memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig)); 217 218 return 0; 219 } 220 221 static int tegra_adma_init(struct tegra_adma *tdma) 222 { 223 u32 status; 224 int ret; 225 226 /* Clear any interrupts */ 227 tdma_write(tdma, tdma->cdata->global_int_clear, 0x1); 228 229 /* Assert soft reset */ 230 tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1); 231 232 /* Wait for reset to clear */ 233 ret = readx_poll_timeout(readl, 234 tdma->base_addr + 235 tdma->cdata->global_reg_offset + 236 ADMA_GLOBAL_SOFT_RESET, 237 status, status == 0, 20, 10000); 238 if (ret) 239 return ret; 240 241 /* Enable global ADMA registers */ 242 tdma_write(tdma, ADMA_GLOBAL_CMD, 1); 243 244 return 0; 245 } 246 247 static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc, 248 enum dma_transfer_direction direction) 249 { 250 struct tegra_adma *tdma = tdc->tdma; 251 unsigned int sreq_index = tdc->sreq_index; 252 253 if (tdc->sreq_reserved) 254 return tdc->sreq_dir == direction ? 0 : -EINVAL; 255 256 if (sreq_index > tdma->cdata->ch_req_max) { 257 dev_err(tdma->dev, "invalid DMA request\n"); 258 return -EINVAL; 259 } 260 261 switch (direction) { 262 case DMA_MEM_TO_DEV: 263 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) { 264 dev_err(tdma->dev, "DMA request reserved\n"); 265 return -EINVAL; 266 } 267 break; 268 269 case DMA_DEV_TO_MEM: 270 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) { 271 dev_err(tdma->dev, "DMA request reserved\n"); 272 return -EINVAL; 273 } 274 break; 275 276 default: 277 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n", 278 dma_chan_name(&tdc->vc.chan)); 279 return -EINVAL; 280 } 281 282 tdc->sreq_dir = direction; 283 tdc->sreq_reserved = true; 284 285 return 0; 286 } 287 288 static void tegra_adma_request_free(struct tegra_adma_chan *tdc) 289 { 290 struct tegra_adma *tdma = tdc->tdma; 291 292 if (!tdc->sreq_reserved) 293 return; 294 295 switch (tdc->sreq_dir) { 296 case DMA_MEM_TO_DEV: 297 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved); 298 break; 299 300 case DMA_DEV_TO_MEM: 301 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved); 302 break; 303 304 default: 305 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n", 306 dma_chan_name(&tdc->vc.chan)); 307 return; 308 } 309 310 tdc->sreq_reserved = false; 311 } 312 313 static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc) 314 { 315 u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS); 316 317 return status & ADMA_CH_INT_STATUS_XFER_DONE; 318 } 319 320 static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc) 321 { 322 u32 status = tegra_adma_irq_status(tdc); 323 324 if (status) 325 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status); 326 327 return status; 328 } 329 330 static void tegra_adma_stop(struct tegra_adma_chan *tdc) 331 { 332 unsigned int status; 333 334 /* Disable ADMA */ 335 tdma_ch_write(tdc, ADMA_CH_CMD, 0); 336 337 /* Clear interrupt status */ 338 tegra_adma_irq_clear(tdc); 339 340 if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS, 341 status, !(status & ADMA_CH_STATUS_XFER_EN), 342 20, 10000)) { 343 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n"); 344 return; 345 } 346 347 kfree(tdc->desc); 348 tdc->desc = NULL; 349 } 350 351 static void tegra_adma_start(struct tegra_adma_chan *tdc) 352 { 353 struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc); 354 struct tegra_adma_chan_regs *ch_regs; 355 struct tegra_adma_desc *desc; 356 357 if (!vd) 358 return; 359 360 list_del(&vd->node); 361 362 desc = to_tegra_adma_desc(&vd->tx); 363 364 if (!desc) { 365 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n"); 366 return; 367 } 368 369 ch_regs = &desc->ch_regs; 370 371 tdc->tx_buf_pos = 0; 372 tdc->tx_buf_count = 0; 373 tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc); 374 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 375 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr); 376 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr); 377 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl); 378 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config); 379 380 /* Start ADMA */ 381 tdma_ch_write(tdc, ADMA_CH_CMD, 1); 382 383 tdc->desc = desc; 384 } 385 386 static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc) 387 { 388 struct tegra_adma_desc *desc = tdc->desc; 389 unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1; 390 unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS); 391 unsigned int periods_remaining; 392 393 /* 394 * Handle wrap around of buffer count register 395 */ 396 if (pos < tdc->tx_buf_pos) 397 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos); 398 else 399 tdc->tx_buf_count += pos - tdc->tx_buf_pos; 400 401 periods_remaining = tdc->tx_buf_count % desc->num_periods; 402 tdc->tx_buf_pos = pos; 403 404 return desc->buf_len - (periods_remaining * desc->period_len); 405 } 406 407 static irqreturn_t tegra_adma_isr(int irq, void *dev_id) 408 { 409 struct tegra_adma_chan *tdc = dev_id; 410 unsigned long status; 411 unsigned long flags; 412 413 spin_lock_irqsave(&tdc->vc.lock, flags); 414 415 status = tegra_adma_irq_clear(tdc); 416 if (status == 0 || !tdc->desc) { 417 spin_unlock_irqrestore(&tdc->vc.lock, flags); 418 return IRQ_NONE; 419 } 420 421 vchan_cyclic_callback(&tdc->desc->vd); 422 423 spin_unlock_irqrestore(&tdc->vc.lock, flags); 424 425 return IRQ_HANDLED; 426 } 427 428 static void tegra_adma_issue_pending(struct dma_chan *dc) 429 { 430 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 431 unsigned long flags; 432 433 spin_lock_irqsave(&tdc->vc.lock, flags); 434 435 if (vchan_issue_pending(&tdc->vc)) { 436 if (!tdc->desc) 437 tegra_adma_start(tdc); 438 } 439 440 spin_unlock_irqrestore(&tdc->vc.lock, flags); 441 } 442 443 static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc) 444 { 445 u32 csts; 446 447 csts = tdma_ch_read(tdc, ADMA_CH_STATUS); 448 csts &= ADMA_CH_STATUS_XFER_PAUSED; 449 450 return csts ? true : false; 451 } 452 453 static int tegra_adma_pause(struct dma_chan *dc) 454 { 455 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 456 struct tegra_adma_desc *desc = tdc->desc; 457 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 458 int dcnt = 10; 459 460 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 461 ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT); 462 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 463 464 while (dcnt-- && !tegra_adma_is_paused(tdc)) 465 udelay(TEGRA_ADMA_BURST_COMPLETE_TIME); 466 467 if (dcnt < 0) { 468 dev_err(tdc2dev(tdc), "unable to pause DMA channel\n"); 469 return -EBUSY; 470 } 471 472 return 0; 473 } 474 475 static int tegra_adma_resume(struct dma_chan *dc) 476 { 477 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 478 struct tegra_adma_desc *desc = tdc->desc; 479 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 480 481 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 482 ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT); 483 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 484 485 return 0; 486 } 487 488 static int tegra_adma_terminate_all(struct dma_chan *dc) 489 { 490 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 491 unsigned long flags; 492 LIST_HEAD(head); 493 494 spin_lock_irqsave(&tdc->vc.lock, flags); 495 496 if (tdc->desc) 497 tegra_adma_stop(tdc); 498 499 tegra_adma_request_free(tdc); 500 vchan_get_all_descriptors(&tdc->vc, &head); 501 spin_unlock_irqrestore(&tdc->vc.lock, flags); 502 vchan_dma_desc_free_list(&tdc->vc, &head); 503 504 return 0; 505 } 506 507 static enum dma_status tegra_adma_tx_status(struct dma_chan *dc, 508 dma_cookie_t cookie, 509 struct dma_tx_state *txstate) 510 { 511 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 512 struct tegra_adma_desc *desc; 513 struct virt_dma_desc *vd; 514 enum dma_status ret; 515 unsigned long flags; 516 unsigned int residual; 517 518 ret = dma_cookie_status(dc, cookie, txstate); 519 if (ret == DMA_COMPLETE || !txstate) 520 return ret; 521 522 spin_lock_irqsave(&tdc->vc.lock, flags); 523 524 vd = vchan_find_desc(&tdc->vc, cookie); 525 if (vd) { 526 desc = to_tegra_adma_desc(&vd->tx); 527 residual = desc->ch_regs.tc; 528 } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) { 529 residual = tegra_adma_get_residue(tdc); 530 } else { 531 residual = 0; 532 } 533 534 spin_unlock_irqrestore(&tdc->vc.lock, flags); 535 536 dma_set_residue(txstate, residual); 537 538 return ret; 539 } 540 541 static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size) 542 { 543 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE) 544 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE; 545 546 return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT; 547 } 548 549 static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size) 550 { 551 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE) 552 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE; 553 554 return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT; 555 } 556 557 static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc, 558 struct tegra_adma_desc *desc, 559 dma_addr_t buf_addr, 560 enum dma_transfer_direction direction) 561 { 562 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 563 const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata; 564 unsigned int burst_size, adma_dir; 565 566 if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS) 567 return -EINVAL; 568 569 switch (direction) { 570 case DMA_MEM_TO_DEV: 571 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB; 572 burst_size = tdc->sconfig.dst_maxburst; 573 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1); 574 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index, 575 cdata->ch_req_mask, 576 cdata->ch_req_tx_shift); 577 ch_regs->src_addr = buf_addr; 578 break; 579 580 case DMA_DEV_TO_MEM: 581 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM; 582 burst_size = tdc->sconfig.src_maxburst; 583 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1); 584 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index, 585 cdata->ch_req_mask, 586 cdata->ch_req_rx_shift); 587 ch_regs->trg_addr = buf_addr; 588 break; 589 590 default: 591 dev_err(tdc2dev(tdc), "DMA direction is not supported\n"); 592 return -EINVAL; 593 } 594 595 ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) | 596 ADMA_CH_CTRL_MODE_CONTINUOUS | 597 ADMA_CH_CTRL_FLOWCTRL_EN; 598 ch_regs->config |= cdata->adma_get_burst_config(burst_size); 599 ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1); 600 if (cdata->has_outstanding_reqs) 601 ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8); 602 ch_regs->fifo_ctrl = cdata->ch_fifo_ctrl; 603 ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK; 604 605 return tegra_adma_request_alloc(tdc, direction); 606 } 607 608 static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic( 609 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len, 610 size_t period_len, enum dma_transfer_direction direction, 611 unsigned long flags) 612 { 613 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 614 struct tegra_adma_desc *desc = NULL; 615 616 if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) { 617 dev_err(tdc2dev(tdc), "invalid buffer/period len\n"); 618 return NULL; 619 } 620 621 if (buf_len % period_len) { 622 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n"); 623 return NULL; 624 } 625 626 if (!IS_ALIGNED(buf_addr, 4)) { 627 dev_err(tdc2dev(tdc), "invalid buffer alignment\n"); 628 return NULL; 629 } 630 631 desc = kzalloc(sizeof(*desc), GFP_NOWAIT); 632 if (!desc) 633 return NULL; 634 635 desc->buf_len = buf_len; 636 desc->period_len = period_len; 637 desc->num_periods = buf_len / period_len; 638 639 if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) { 640 kfree(desc); 641 return NULL; 642 } 643 644 return vchan_tx_prep(&tdc->vc, &desc->vd, flags); 645 } 646 647 static int tegra_adma_alloc_chan_resources(struct dma_chan *dc) 648 { 649 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 650 int ret; 651 652 ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc); 653 if (ret) { 654 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n", 655 dma_chan_name(dc)); 656 return ret; 657 } 658 659 ret = pm_runtime_get_sync(tdc2dev(tdc)); 660 if (ret < 0) { 661 pm_runtime_put_noidle(tdc2dev(tdc)); 662 free_irq(tdc->irq, tdc); 663 return ret; 664 } 665 666 dma_cookie_init(&tdc->vc.chan); 667 668 return 0; 669 } 670 671 static void tegra_adma_free_chan_resources(struct dma_chan *dc) 672 { 673 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 674 675 tegra_adma_terminate_all(dc); 676 vchan_free_chan_resources(&tdc->vc); 677 tasklet_kill(&tdc->vc.task); 678 free_irq(tdc->irq, tdc); 679 pm_runtime_put(tdc2dev(tdc)); 680 681 tdc->sreq_index = 0; 682 tdc->sreq_dir = DMA_TRANS_NONE; 683 } 684 685 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, 686 struct of_dma *ofdma) 687 { 688 struct tegra_adma *tdma = ofdma->of_dma_data; 689 struct tegra_adma_chan *tdc; 690 struct dma_chan *chan; 691 unsigned int sreq_index; 692 693 if (dma_spec->args_count != 1) 694 return NULL; 695 696 sreq_index = dma_spec->args[0]; 697 698 if (sreq_index == 0) { 699 dev_err(tdma->dev, "DMA request must not be 0\n"); 700 return NULL; 701 } 702 703 chan = dma_get_any_slave_channel(&tdma->dma_dev); 704 if (!chan) 705 return NULL; 706 707 tdc = to_tegra_adma_chan(chan); 708 tdc->sreq_index = sreq_index; 709 710 return chan; 711 } 712 713 static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev) 714 { 715 struct tegra_adma *tdma = dev_get_drvdata(dev); 716 struct tegra_adma_chan_regs *ch_reg; 717 struct tegra_adma_chan *tdc; 718 int i; 719 720 tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD); 721 if (!tdma->global_cmd) 722 goto clk_disable; 723 724 for (i = 0; i < tdma->nr_channels; i++) { 725 tdc = &tdma->channels[i]; 726 ch_reg = &tdc->ch_regs; 727 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD); 728 /* skip if channel is not active */ 729 if (!ch_reg->cmd) 730 continue; 731 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC); 732 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR); 733 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR); 734 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 735 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL); 736 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG); 737 } 738 739 clk_disable: 740 clk_disable_unprepare(tdma->ahub_clk); 741 742 return 0; 743 } 744 745 static int __maybe_unused tegra_adma_runtime_resume(struct device *dev) 746 { 747 struct tegra_adma *tdma = dev_get_drvdata(dev); 748 struct tegra_adma_chan_regs *ch_reg; 749 struct tegra_adma_chan *tdc; 750 int ret, i; 751 752 ret = clk_prepare_enable(tdma->ahub_clk); 753 if (ret) { 754 dev_err(dev, "ahub clk_enable failed: %d\n", ret); 755 return ret; 756 } 757 tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd); 758 759 if (!tdma->global_cmd) 760 return 0; 761 762 for (i = 0; i < tdma->nr_channels; i++) { 763 tdc = &tdma->channels[i]; 764 ch_reg = &tdc->ch_regs; 765 /* skip if channel was not active earlier */ 766 if (!ch_reg->cmd) 767 continue; 768 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc); 769 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr); 770 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr); 771 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl); 772 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl); 773 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config); 774 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd); 775 } 776 777 return 0; 778 } 779 780 static const struct tegra_adma_chip_data tegra210_chip_data = { 781 .adma_get_burst_config = tegra210_adma_get_burst_config, 782 .global_reg_offset = 0xc00, 783 .global_int_clear = 0x20, 784 .ch_req_tx_shift = 28, 785 .ch_req_rx_shift = 24, 786 .ch_base_offset = 0, 787 .has_outstanding_reqs = false, 788 .ch_fifo_ctrl = TEGRA210_FIFO_CTRL_DEFAULT, 789 .ch_req_mask = 0xf, 790 .ch_req_max = 10, 791 .ch_reg_size = 0x80, 792 .nr_channels = 22, 793 }; 794 795 static const struct tegra_adma_chip_data tegra186_chip_data = { 796 .adma_get_burst_config = tegra186_adma_get_burst_config, 797 .global_reg_offset = 0, 798 .global_int_clear = 0x402c, 799 .ch_req_tx_shift = 27, 800 .ch_req_rx_shift = 22, 801 .ch_base_offset = 0x10000, 802 .has_outstanding_reqs = true, 803 .ch_fifo_ctrl = TEGRA186_FIFO_CTRL_DEFAULT, 804 .ch_req_mask = 0x1f, 805 .ch_req_max = 20, 806 .ch_reg_size = 0x100, 807 .nr_channels = 32, 808 }; 809 810 static const struct of_device_id tegra_adma_of_match[] = { 811 { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data }, 812 { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data }, 813 { }, 814 }; 815 MODULE_DEVICE_TABLE(of, tegra_adma_of_match); 816 817 static int tegra_adma_probe(struct platform_device *pdev) 818 { 819 const struct tegra_adma_chip_data *cdata; 820 struct tegra_adma *tdma; 821 struct resource *res; 822 int ret, i; 823 824 cdata = of_device_get_match_data(&pdev->dev); 825 if (!cdata) { 826 dev_err(&pdev->dev, "device match data not found\n"); 827 return -ENODEV; 828 } 829 830 tdma = devm_kzalloc(&pdev->dev, 831 struct_size(tdma, channels, cdata->nr_channels), 832 GFP_KERNEL); 833 if (!tdma) 834 return -ENOMEM; 835 836 tdma->dev = &pdev->dev; 837 tdma->cdata = cdata; 838 tdma->nr_channels = cdata->nr_channels; 839 platform_set_drvdata(pdev, tdma); 840 841 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 842 tdma->base_addr = devm_ioremap_resource(&pdev->dev, res); 843 if (IS_ERR(tdma->base_addr)) 844 return PTR_ERR(tdma->base_addr); 845 846 tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio"); 847 if (IS_ERR(tdma->ahub_clk)) { 848 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n"); 849 return PTR_ERR(tdma->ahub_clk); 850 } 851 852 INIT_LIST_HEAD(&tdma->dma_dev.channels); 853 for (i = 0; i < tdma->nr_channels; i++) { 854 struct tegra_adma_chan *tdc = &tdma->channels[i]; 855 856 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset 857 + (cdata->ch_reg_size * i); 858 859 tdc->irq = of_irq_get(pdev->dev.of_node, i); 860 if (tdc->irq <= 0) { 861 ret = tdc->irq ?: -ENXIO; 862 goto irq_dispose; 863 } 864 865 vchan_init(&tdc->vc, &tdma->dma_dev); 866 tdc->vc.desc_free = tegra_adma_desc_free; 867 tdc->tdma = tdma; 868 } 869 870 pm_runtime_enable(&pdev->dev); 871 872 ret = pm_runtime_get_sync(&pdev->dev); 873 if (ret < 0) { 874 pm_runtime_put_noidle(&pdev->dev); 875 goto rpm_disable; 876 } 877 878 ret = tegra_adma_init(tdma); 879 if (ret) 880 goto rpm_put; 881 882 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask); 883 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask); 884 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask); 885 886 tdma->dma_dev.dev = &pdev->dev; 887 tdma->dma_dev.device_alloc_chan_resources = 888 tegra_adma_alloc_chan_resources; 889 tdma->dma_dev.device_free_chan_resources = 890 tegra_adma_free_chan_resources; 891 tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending; 892 tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic; 893 tdma->dma_dev.device_config = tegra_adma_slave_config; 894 tdma->dma_dev.device_tx_status = tegra_adma_tx_status; 895 tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all; 896 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 897 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 898 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); 899 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; 900 tdma->dma_dev.device_pause = tegra_adma_pause; 901 tdma->dma_dev.device_resume = tegra_adma_resume; 902 903 ret = dma_async_device_register(&tdma->dma_dev); 904 if (ret < 0) { 905 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret); 906 goto rpm_put; 907 } 908 909 ret = of_dma_controller_register(pdev->dev.of_node, 910 tegra_dma_of_xlate, tdma); 911 if (ret < 0) { 912 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret); 913 goto dma_remove; 914 } 915 916 pm_runtime_put(&pdev->dev); 917 918 dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n", 919 tdma->nr_channels); 920 921 return 0; 922 923 dma_remove: 924 dma_async_device_unregister(&tdma->dma_dev); 925 rpm_put: 926 pm_runtime_put_sync(&pdev->dev); 927 rpm_disable: 928 pm_runtime_disable(&pdev->dev); 929 irq_dispose: 930 while (--i >= 0) 931 irq_dispose_mapping(tdma->channels[i].irq); 932 933 return ret; 934 } 935 936 static int tegra_adma_remove(struct platform_device *pdev) 937 { 938 struct tegra_adma *tdma = platform_get_drvdata(pdev); 939 int i; 940 941 of_dma_controller_free(pdev->dev.of_node); 942 dma_async_device_unregister(&tdma->dma_dev); 943 944 for (i = 0; i < tdma->nr_channels; ++i) 945 irq_dispose_mapping(tdma->channels[i].irq); 946 947 pm_runtime_put_sync(&pdev->dev); 948 pm_runtime_disable(&pdev->dev); 949 950 return 0; 951 } 952 953 static const struct dev_pm_ops tegra_adma_dev_pm_ops = { 954 SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend, 955 tegra_adma_runtime_resume, NULL) 956 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 957 pm_runtime_force_resume) 958 }; 959 960 static struct platform_driver tegra_admac_driver = { 961 .driver = { 962 .name = "tegra-adma", 963 .pm = &tegra_adma_dev_pm_ops, 964 .of_match_table = tegra_adma_of_match, 965 }, 966 .probe = tegra_adma_probe, 967 .remove = tegra_adma_remove, 968 }; 969 970 module_platform_driver(tegra_admac_driver); 971 972 MODULE_ALIAS("platform:tegra210-adma"); 973 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver"); 974 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>"); 975 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); 976 MODULE_LICENSE("GPL v2"); 977