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.h> 12 #include <linux/of_dma.h> 13 #include <linux/of_irq.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/slab.h> 17 18 #include "virt-dma.h" 19 20 #define ADMA_CH_CMD 0x00 21 #define ADMA_CH_STATUS 0x0c 22 #define ADMA_CH_STATUS_XFER_EN BIT(0) 23 #define ADMA_CH_STATUS_XFER_PAUSED BIT(1) 24 25 #define ADMA_CH_INT_STATUS 0x10 26 #define ADMA_CH_INT_STATUS_XFER_DONE BIT(0) 27 28 #define ADMA_CH_INT_CLEAR 0x1c 29 #define ADMA_CH_CTRL 0x24 30 #define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12) 31 #define ADMA_CH_CTRL_DIR_AHUB2MEM 2 32 #define ADMA_CH_CTRL_DIR_MEM2AHUB 4 33 #define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8) 34 #define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1) 35 #define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0 36 37 #define ADMA_CH_CONFIG 0x28 38 #define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28) 39 #define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24) 40 #define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20 41 #define ADMA_CH_CONFIG_MAX_BURST_SIZE 16 42 #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf) 43 #define ADMA_CH_CONFIG_MAX_BUFS 8 44 #define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4) 45 46 #define ADMA_CH_FIFO_CTRL 0x2c 47 #define ADMA_CH_TX_FIFO_SIZE_SHIFT 8 48 #define ADMA_CH_RX_FIFO_SIZE_SHIFT 0 49 50 #define ADMA_CH_LOWER_SRC_ADDR 0x34 51 #define ADMA_CH_LOWER_TRG_ADDR 0x3c 52 #define ADMA_CH_TC 0x44 53 #define ADMA_CH_TC_COUNT_MASK 0x3ffffffc 54 55 #define ADMA_CH_XFER_STATUS 0x54 56 #define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff 57 58 #define ADMA_GLOBAL_CMD 0x00 59 #define ADMA_GLOBAL_SOFT_RESET 0x04 60 61 #define TEGRA_ADMA_BURST_COMPLETE_TIME 20 62 63 #define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift) 64 65 struct tegra_adma; 66 67 /* 68 * struct tegra_adma_chip_data - Tegra chip specific data 69 * @adma_get_burst_config: Function callback used to set DMA burst size. 70 * @global_reg_offset: Register offset of DMA global register. 71 * @global_int_clear: Register offset of DMA global interrupt clear. 72 * @ch_req_tx_shift: Register offset for AHUB transmit channel select. 73 * @ch_req_rx_shift: Register offset for AHUB receive channel select. 74 * @ch_base_offset: Register offset of DMA channel registers. 75 * @ch_fifo_ctrl: Default value for channel FIFO CTRL register. 76 * @ch_req_mask: Mask for Tx or Rx channel select. 77 * @ch_req_max: Maximum number of Tx or Rx channels available. 78 * @ch_reg_size: Size of DMA channel register space. 79 * @nr_channels: Number of DMA channels available. 80 * @ch_fifo_size_mask: Mask for FIFO size field. 81 * @sreq_index_offset: Slave channel index offset. 82 * @has_outstanding_reqs: If DMA channel can have outstanding requests. 83 */ 84 struct tegra_adma_chip_data { 85 unsigned int (*adma_get_burst_config)(unsigned int burst_size); 86 unsigned int global_reg_offset; 87 unsigned int global_int_clear; 88 unsigned int ch_req_tx_shift; 89 unsigned int ch_req_rx_shift; 90 unsigned int ch_base_offset; 91 unsigned int ch_fifo_ctrl; 92 unsigned int ch_req_mask; 93 unsigned int ch_req_max; 94 unsigned int ch_reg_size; 95 unsigned int nr_channels; 96 unsigned int ch_fifo_size_mask; 97 unsigned int sreq_index_offset; 98 bool has_outstanding_reqs; 99 }; 100 101 /* 102 * struct tegra_adma_chan_regs - Tegra ADMA channel registers 103 */ 104 struct tegra_adma_chan_regs { 105 unsigned int ctrl; 106 unsigned int config; 107 unsigned int src_addr; 108 unsigned int trg_addr; 109 unsigned int fifo_ctrl; 110 unsigned int cmd; 111 unsigned int tc; 112 }; 113 114 /* 115 * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests. 116 */ 117 struct tegra_adma_desc { 118 struct virt_dma_desc vd; 119 struct tegra_adma_chan_regs ch_regs; 120 size_t buf_len; 121 size_t period_len; 122 size_t num_periods; 123 }; 124 125 /* 126 * struct tegra_adma_chan - Tegra ADMA channel information 127 */ 128 struct tegra_adma_chan { 129 struct virt_dma_chan vc; 130 struct tegra_adma_desc *desc; 131 struct tegra_adma *tdma; 132 int irq; 133 void __iomem *chan_addr; 134 135 /* Slave channel configuration info */ 136 struct dma_slave_config sconfig; 137 enum dma_transfer_direction sreq_dir; 138 unsigned int sreq_index; 139 bool sreq_reserved; 140 struct tegra_adma_chan_regs ch_regs; 141 142 /* Transfer count and position info */ 143 unsigned int tx_buf_count; 144 unsigned int tx_buf_pos; 145 }; 146 147 /* 148 * struct tegra_adma - Tegra ADMA controller information 149 */ 150 struct tegra_adma { 151 struct dma_device dma_dev; 152 struct device *dev; 153 void __iomem *base_addr; 154 struct clk *ahub_clk; 155 unsigned int nr_channels; 156 unsigned long rx_requests_reserved; 157 unsigned long tx_requests_reserved; 158 159 /* Used to store global command register state when suspending */ 160 unsigned int global_cmd; 161 162 const struct tegra_adma_chip_data *cdata; 163 164 /* Last member of the structure */ 165 struct tegra_adma_chan channels[]; 166 }; 167 tdma_write(struct tegra_adma * tdma,u32 reg,u32 val)168 static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val) 169 { 170 writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg); 171 } 172 tdma_read(struct tegra_adma * tdma,u32 reg)173 static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg) 174 { 175 return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg); 176 } 177 tdma_ch_write(struct tegra_adma_chan * tdc,u32 reg,u32 val)178 static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val) 179 { 180 writel(val, tdc->chan_addr + reg); 181 } 182 tdma_ch_read(struct tegra_adma_chan * tdc,u32 reg)183 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg) 184 { 185 return readl(tdc->chan_addr + reg); 186 } 187 to_tegra_adma_chan(struct dma_chan * dc)188 static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc) 189 { 190 return container_of(dc, struct tegra_adma_chan, vc.chan); 191 } 192 to_tegra_adma_desc(struct dma_async_tx_descriptor * td)193 static inline struct tegra_adma_desc *to_tegra_adma_desc( 194 struct dma_async_tx_descriptor *td) 195 { 196 return container_of(td, struct tegra_adma_desc, vd.tx); 197 } 198 tdc2dev(struct tegra_adma_chan * tdc)199 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc) 200 { 201 return tdc->tdma->dev; 202 } 203 tegra_adma_desc_free(struct virt_dma_desc * vd)204 static void tegra_adma_desc_free(struct virt_dma_desc *vd) 205 { 206 kfree(container_of(vd, struct tegra_adma_desc, vd)); 207 } 208 tegra_adma_slave_config(struct dma_chan * dc,struct dma_slave_config * sconfig)209 static int tegra_adma_slave_config(struct dma_chan *dc, 210 struct dma_slave_config *sconfig) 211 { 212 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 213 214 memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig)); 215 216 return 0; 217 } 218 tegra_adma_init(struct tegra_adma * tdma)219 static int tegra_adma_init(struct tegra_adma *tdma) 220 { 221 u32 status; 222 int ret; 223 224 /* Clear any interrupts */ 225 tdma_write(tdma, tdma->cdata->ch_base_offset + tdma->cdata->global_int_clear, 0x1); 226 227 /* Assert soft reset */ 228 tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1); 229 230 /* Wait for reset to clear */ 231 ret = readx_poll_timeout(readl, 232 tdma->base_addr + 233 tdma->cdata->global_reg_offset + 234 ADMA_GLOBAL_SOFT_RESET, 235 status, status == 0, 20, 10000); 236 if (ret) 237 return ret; 238 239 /* Enable global ADMA registers */ 240 tdma_write(tdma, ADMA_GLOBAL_CMD, 1); 241 242 return 0; 243 } 244 tegra_adma_request_alloc(struct tegra_adma_chan * tdc,enum dma_transfer_direction direction)245 static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc, 246 enum dma_transfer_direction direction) 247 { 248 struct tegra_adma *tdma = tdc->tdma; 249 unsigned int sreq_index = tdc->sreq_index; 250 251 if (tdc->sreq_reserved) 252 return tdc->sreq_dir == direction ? 0 : -EINVAL; 253 254 if (sreq_index > tdma->cdata->ch_req_max) { 255 dev_err(tdma->dev, "invalid DMA request\n"); 256 return -EINVAL; 257 } 258 259 switch (direction) { 260 case DMA_MEM_TO_DEV: 261 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) { 262 dev_err(tdma->dev, "DMA request reserved\n"); 263 return -EINVAL; 264 } 265 break; 266 267 case DMA_DEV_TO_MEM: 268 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) { 269 dev_err(tdma->dev, "DMA request reserved\n"); 270 return -EINVAL; 271 } 272 break; 273 274 default: 275 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n", 276 dma_chan_name(&tdc->vc.chan)); 277 return -EINVAL; 278 } 279 280 tdc->sreq_dir = direction; 281 tdc->sreq_reserved = true; 282 283 return 0; 284 } 285 tegra_adma_request_free(struct tegra_adma_chan * tdc)286 static void tegra_adma_request_free(struct tegra_adma_chan *tdc) 287 { 288 struct tegra_adma *tdma = tdc->tdma; 289 290 if (!tdc->sreq_reserved) 291 return; 292 293 switch (tdc->sreq_dir) { 294 case DMA_MEM_TO_DEV: 295 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved); 296 break; 297 298 case DMA_DEV_TO_MEM: 299 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved); 300 break; 301 302 default: 303 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n", 304 dma_chan_name(&tdc->vc.chan)); 305 return; 306 } 307 308 tdc->sreq_reserved = false; 309 } 310 tegra_adma_irq_status(struct tegra_adma_chan * tdc)311 static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc) 312 { 313 u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS); 314 315 return status & ADMA_CH_INT_STATUS_XFER_DONE; 316 } 317 tegra_adma_irq_clear(struct tegra_adma_chan * tdc)318 static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc) 319 { 320 u32 status = tegra_adma_irq_status(tdc); 321 322 if (status) 323 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status); 324 325 return status; 326 } 327 tegra_adma_stop(struct tegra_adma_chan * tdc)328 static void tegra_adma_stop(struct tegra_adma_chan *tdc) 329 { 330 unsigned int status; 331 332 /* Disable ADMA */ 333 tdma_ch_write(tdc, ADMA_CH_CMD, 0); 334 335 /* Clear interrupt status */ 336 tegra_adma_irq_clear(tdc); 337 338 if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS, 339 status, !(status & ADMA_CH_STATUS_XFER_EN), 340 20, 10000)) { 341 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n"); 342 return; 343 } 344 345 kfree(tdc->desc); 346 tdc->desc = NULL; 347 } 348 tegra_adma_start(struct tegra_adma_chan * tdc)349 static void tegra_adma_start(struct tegra_adma_chan *tdc) 350 { 351 struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc); 352 struct tegra_adma_chan_regs *ch_regs; 353 struct tegra_adma_desc *desc; 354 355 if (!vd) 356 return; 357 358 list_del(&vd->node); 359 360 desc = to_tegra_adma_desc(&vd->tx); 361 362 if (!desc) { 363 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n"); 364 return; 365 } 366 367 ch_regs = &desc->ch_regs; 368 369 tdc->tx_buf_pos = 0; 370 tdc->tx_buf_count = 0; 371 tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc); 372 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 373 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr); 374 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr); 375 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl); 376 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config); 377 378 /* Start ADMA */ 379 tdma_ch_write(tdc, ADMA_CH_CMD, 1); 380 381 tdc->desc = desc; 382 } 383 tegra_adma_get_residue(struct tegra_adma_chan * tdc)384 static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc) 385 { 386 struct tegra_adma_desc *desc = tdc->desc; 387 unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1; 388 unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS); 389 unsigned int periods_remaining; 390 391 /* 392 * Handle wrap around of buffer count register 393 */ 394 if (pos < tdc->tx_buf_pos) 395 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos); 396 else 397 tdc->tx_buf_count += pos - tdc->tx_buf_pos; 398 399 periods_remaining = tdc->tx_buf_count % desc->num_periods; 400 tdc->tx_buf_pos = pos; 401 402 return desc->buf_len - (periods_remaining * desc->period_len); 403 } 404 tegra_adma_isr(int irq,void * dev_id)405 static irqreturn_t tegra_adma_isr(int irq, void *dev_id) 406 { 407 struct tegra_adma_chan *tdc = dev_id; 408 unsigned long status; 409 410 spin_lock(&tdc->vc.lock); 411 412 status = tegra_adma_irq_clear(tdc); 413 if (status == 0 || !tdc->desc) { 414 spin_unlock(&tdc->vc.lock); 415 return IRQ_NONE; 416 } 417 418 vchan_cyclic_callback(&tdc->desc->vd); 419 420 spin_unlock(&tdc->vc.lock); 421 422 return IRQ_HANDLED; 423 } 424 tegra_adma_issue_pending(struct dma_chan * dc)425 static void tegra_adma_issue_pending(struct dma_chan *dc) 426 { 427 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 428 unsigned long flags; 429 430 spin_lock_irqsave(&tdc->vc.lock, flags); 431 432 if (vchan_issue_pending(&tdc->vc)) { 433 if (!tdc->desc) 434 tegra_adma_start(tdc); 435 } 436 437 spin_unlock_irqrestore(&tdc->vc.lock, flags); 438 } 439 tegra_adma_is_paused(struct tegra_adma_chan * tdc)440 static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc) 441 { 442 u32 csts; 443 444 csts = tdma_ch_read(tdc, ADMA_CH_STATUS); 445 csts &= ADMA_CH_STATUS_XFER_PAUSED; 446 447 return csts ? true : false; 448 } 449 tegra_adma_pause(struct dma_chan * dc)450 static int tegra_adma_pause(struct dma_chan *dc) 451 { 452 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 453 struct tegra_adma_desc *desc = tdc->desc; 454 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 455 int dcnt = 10; 456 457 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 458 ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT); 459 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 460 461 while (dcnt-- && !tegra_adma_is_paused(tdc)) 462 udelay(TEGRA_ADMA_BURST_COMPLETE_TIME); 463 464 if (dcnt < 0) { 465 dev_err(tdc2dev(tdc), "unable to pause DMA channel\n"); 466 return -EBUSY; 467 } 468 469 return 0; 470 } 471 tegra_adma_resume(struct dma_chan * dc)472 static int tegra_adma_resume(struct dma_chan *dc) 473 { 474 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 475 struct tegra_adma_desc *desc = tdc->desc; 476 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 477 478 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 479 ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT); 480 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl); 481 482 return 0; 483 } 484 tegra_adma_terminate_all(struct dma_chan * dc)485 static int tegra_adma_terminate_all(struct dma_chan *dc) 486 { 487 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 488 unsigned long flags; 489 LIST_HEAD(head); 490 491 spin_lock_irqsave(&tdc->vc.lock, flags); 492 493 if (tdc->desc) 494 tegra_adma_stop(tdc); 495 496 tegra_adma_request_free(tdc); 497 vchan_get_all_descriptors(&tdc->vc, &head); 498 spin_unlock_irqrestore(&tdc->vc.lock, flags); 499 vchan_dma_desc_free_list(&tdc->vc, &head); 500 501 return 0; 502 } 503 tegra_adma_tx_status(struct dma_chan * dc,dma_cookie_t cookie,struct dma_tx_state * txstate)504 static enum dma_status tegra_adma_tx_status(struct dma_chan *dc, 505 dma_cookie_t cookie, 506 struct dma_tx_state *txstate) 507 { 508 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 509 struct tegra_adma_desc *desc; 510 struct virt_dma_desc *vd; 511 enum dma_status ret; 512 unsigned long flags; 513 unsigned int residual; 514 515 ret = dma_cookie_status(dc, cookie, txstate); 516 if (ret == DMA_COMPLETE || !txstate) 517 return ret; 518 519 spin_lock_irqsave(&tdc->vc.lock, flags); 520 521 vd = vchan_find_desc(&tdc->vc, cookie); 522 if (vd) { 523 desc = to_tegra_adma_desc(&vd->tx); 524 residual = desc->ch_regs.tc; 525 } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) { 526 residual = tegra_adma_get_residue(tdc); 527 } else { 528 residual = 0; 529 } 530 531 spin_unlock_irqrestore(&tdc->vc.lock, flags); 532 533 dma_set_residue(txstate, residual); 534 535 return ret; 536 } 537 tegra210_adma_get_burst_config(unsigned int burst_size)538 static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size) 539 { 540 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE) 541 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE; 542 543 return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT; 544 } 545 tegra186_adma_get_burst_config(unsigned int burst_size)546 static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size) 547 { 548 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE) 549 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE; 550 551 return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT; 552 } 553 tegra_adma_set_xfer_params(struct tegra_adma_chan * tdc,struct tegra_adma_desc * desc,dma_addr_t buf_addr,enum dma_transfer_direction direction)554 static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc, 555 struct tegra_adma_desc *desc, 556 dma_addr_t buf_addr, 557 enum dma_transfer_direction direction) 558 { 559 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; 560 const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata; 561 unsigned int burst_size, adma_dir, fifo_size_shift; 562 563 if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS) 564 return -EINVAL; 565 566 switch (direction) { 567 case DMA_MEM_TO_DEV: 568 fifo_size_shift = ADMA_CH_TX_FIFO_SIZE_SHIFT; 569 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB; 570 burst_size = tdc->sconfig.dst_maxburst; 571 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1); 572 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index, 573 cdata->ch_req_mask, 574 cdata->ch_req_tx_shift); 575 ch_regs->src_addr = buf_addr; 576 break; 577 578 case DMA_DEV_TO_MEM: 579 fifo_size_shift = ADMA_CH_RX_FIFO_SIZE_SHIFT; 580 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM; 581 burst_size = tdc->sconfig.src_maxburst; 582 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1); 583 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index, 584 cdata->ch_req_mask, 585 cdata->ch_req_rx_shift); 586 ch_regs->trg_addr = buf_addr; 587 break; 588 589 default: 590 dev_err(tdc2dev(tdc), "DMA direction is not supported\n"); 591 return -EINVAL; 592 } 593 594 ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) | 595 ADMA_CH_CTRL_MODE_CONTINUOUS | 596 ADMA_CH_CTRL_FLOWCTRL_EN; 597 ch_regs->config |= cdata->adma_get_burst_config(burst_size); 598 ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1); 599 if (cdata->has_outstanding_reqs) 600 ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8); 601 602 /* 603 * 'sreq_index' represents the current ADMAIF channel number and as per 604 * HW recommendation its FIFO size should match with the corresponding 605 * ADMA channel. 606 * 607 * ADMA FIFO size is set as per below (based on default ADMAIF channel 608 * FIFO sizes): 609 * fifo_size = 0x2 (sreq_index > sreq_index_offset) 610 * fifo_size = 0x3 (sreq_index <= sreq_index_offset) 611 * 612 */ 613 if (tdc->sreq_index > cdata->sreq_index_offset) 614 ch_regs->fifo_ctrl = 615 ADMA_CH_REG_FIELD_VAL(2, cdata->ch_fifo_size_mask, 616 fifo_size_shift); 617 else 618 ch_regs->fifo_ctrl = 619 ADMA_CH_REG_FIELD_VAL(3, cdata->ch_fifo_size_mask, 620 fifo_size_shift); 621 622 ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK; 623 624 return tegra_adma_request_alloc(tdc, direction); 625 } 626 tegra_adma_prep_dma_cyclic(struct dma_chan * dc,dma_addr_t buf_addr,size_t buf_len,size_t period_len,enum dma_transfer_direction direction,unsigned long flags)627 static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic( 628 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len, 629 size_t period_len, enum dma_transfer_direction direction, 630 unsigned long flags) 631 { 632 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 633 struct tegra_adma_desc *desc = NULL; 634 635 if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) { 636 dev_err(tdc2dev(tdc), "invalid buffer/period len\n"); 637 return NULL; 638 } 639 640 if (buf_len % period_len) { 641 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n"); 642 return NULL; 643 } 644 645 if (!IS_ALIGNED(buf_addr, 4)) { 646 dev_err(tdc2dev(tdc), "invalid buffer alignment\n"); 647 return NULL; 648 } 649 650 desc = kzalloc(sizeof(*desc), GFP_NOWAIT); 651 if (!desc) 652 return NULL; 653 654 desc->buf_len = buf_len; 655 desc->period_len = period_len; 656 desc->num_periods = buf_len / period_len; 657 658 if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) { 659 kfree(desc); 660 return NULL; 661 } 662 663 return vchan_tx_prep(&tdc->vc, &desc->vd, flags); 664 } 665 tegra_adma_alloc_chan_resources(struct dma_chan * dc)666 static int tegra_adma_alloc_chan_resources(struct dma_chan *dc) 667 { 668 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 669 int ret; 670 671 ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc); 672 if (ret) { 673 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n", 674 dma_chan_name(dc)); 675 return ret; 676 } 677 678 ret = pm_runtime_resume_and_get(tdc2dev(tdc)); 679 if (ret < 0) { 680 free_irq(tdc->irq, tdc); 681 return ret; 682 } 683 684 dma_cookie_init(&tdc->vc.chan); 685 686 return 0; 687 } 688 tegra_adma_free_chan_resources(struct dma_chan * dc)689 static void tegra_adma_free_chan_resources(struct dma_chan *dc) 690 { 691 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); 692 693 tegra_adma_terminate_all(dc); 694 vchan_free_chan_resources(&tdc->vc); 695 tasklet_kill(&tdc->vc.task); 696 free_irq(tdc->irq, tdc); 697 pm_runtime_put(tdc2dev(tdc)); 698 699 tdc->sreq_index = 0; 700 tdc->sreq_dir = DMA_TRANS_NONE; 701 } 702 tegra_dma_of_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)703 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, 704 struct of_dma *ofdma) 705 { 706 struct tegra_adma *tdma = ofdma->of_dma_data; 707 struct tegra_adma_chan *tdc; 708 struct dma_chan *chan; 709 unsigned int sreq_index; 710 711 if (dma_spec->args_count != 1) 712 return NULL; 713 714 sreq_index = dma_spec->args[0]; 715 716 if (sreq_index == 0) { 717 dev_err(tdma->dev, "DMA request must not be 0\n"); 718 return NULL; 719 } 720 721 chan = dma_get_any_slave_channel(&tdma->dma_dev); 722 if (!chan) 723 return NULL; 724 725 tdc = to_tegra_adma_chan(chan); 726 tdc->sreq_index = sreq_index; 727 728 return chan; 729 } 730 tegra_adma_runtime_suspend(struct device * dev)731 static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev) 732 { 733 struct tegra_adma *tdma = dev_get_drvdata(dev); 734 struct tegra_adma_chan_regs *ch_reg; 735 struct tegra_adma_chan *tdc; 736 int i; 737 738 tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD); 739 if (!tdma->global_cmd) 740 goto clk_disable; 741 742 for (i = 0; i < tdma->nr_channels; i++) { 743 tdc = &tdma->channels[i]; 744 ch_reg = &tdc->ch_regs; 745 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD); 746 /* skip if channel is not active */ 747 if (!ch_reg->cmd) 748 continue; 749 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC); 750 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR); 751 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR); 752 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL); 753 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL); 754 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG); 755 } 756 757 clk_disable: 758 clk_disable_unprepare(tdma->ahub_clk); 759 760 return 0; 761 } 762 tegra_adma_runtime_resume(struct device * dev)763 static int __maybe_unused tegra_adma_runtime_resume(struct device *dev) 764 { 765 struct tegra_adma *tdma = dev_get_drvdata(dev); 766 struct tegra_adma_chan_regs *ch_reg; 767 struct tegra_adma_chan *tdc; 768 int ret, i; 769 770 ret = clk_prepare_enable(tdma->ahub_clk); 771 if (ret) { 772 dev_err(dev, "ahub clk_enable failed: %d\n", ret); 773 return ret; 774 } 775 tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd); 776 777 if (!tdma->global_cmd) 778 return 0; 779 780 for (i = 0; i < tdma->nr_channels; i++) { 781 tdc = &tdma->channels[i]; 782 ch_reg = &tdc->ch_regs; 783 /* skip if channel was not active earlier */ 784 if (!ch_reg->cmd) 785 continue; 786 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc); 787 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr); 788 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr); 789 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl); 790 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl); 791 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config); 792 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd); 793 } 794 795 return 0; 796 } 797 798 static const struct tegra_adma_chip_data tegra210_chip_data = { 799 .adma_get_burst_config = tegra210_adma_get_burst_config, 800 .global_reg_offset = 0xc00, 801 .global_int_clear = 0x20, 802 .ch_req_tx_shift = 28, 803 .ch_req_rx_shift = 24, 804 .ch_base_offset = 0, 805 .ch_req_mask = 0xf, 806 .ch_req_max = 10, 807 .ch_reg_size = 0x80, 808 .nr_channels = 22, 809 .ch_fifo_size_mask = 0xf, 810 .sreq_index_offset = 2, 811 .has_outstanding_reqs = false, 812 }; 813 814 static const struct tegra_adma_chip_data tegra186_chip_data = { 815 .adma_get_burst_config = tegra186_adma_get_burst_config, 816 .global_reg_offset = 0, 817 .global_int_clear = 0x402c, 818 .ch_req_tx_shift = 27, 819 .ch_req_rx_shift = 22, 820 .ch_base_offset = 0x10000, 821 .ch_req_mask = 0x1f, 822 .ch_req_max = 20, 823 .ch_reg_size = 0x100, 824 .nr_channels = 32, 825 .ch_fifo_size_mask = 0x1f, 826 .sreq_index_offset = 4, 827 .has_outstanding_reqs = true, 828 }; 829 830 static const struct of_device_id tegra_adma_of_match[] = { 831 { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data }, 832 { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data }, 833 { }, 834 }; 835 MODULE_DEVICE_TABLE(of, tegra_adma_of_match); 836 tegra_adma_probe(struct platform_device * pdev)837 static int tegra_adma_probe(struct platform_device *pdev) 838 { 839 const struct tegra_adma_chip_data *cdata; 840 struct tegra_adma *tdma; 841 int ret, i; 842 843 cdata = of_device_get_match_data(&pdev->dev); 844 if (!cdata) { 845 dev_err(&pdev->dev, "device match data not found\n"); 846 return -ENODEV; 847 } 848 849 tdma = devm_kzalloc(&pdev->dev, 850 struct_size(tdma, channels, cdata->nr_channels), 851 GFP_KERNEL); 852 if (!tdma) 853 return -ENOMEM; 854 855 tdma->dev = &pdev->dev; 856 tdma->cdata = cdata; 857 tdma->nr_channels = cdata->nr_channels; 858 platform_set_drvdata(pdev, tdma); 859 860 tdma->base_addr = devm_platform_ioremap_resource(pdev, 0); 861 if (IS_ERR(tdma->base_addr)) 862 return PTR_ERR(tdma->base_addr); 863 864 tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio"); 865 if (IS_ERR(tdma->ahub_clk)) { 866 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n"); 867 return PTR_ERR(tdma->ahub_clk); 868 } 869 870 INIT_LIST_HEAD(&tdma->dma_dev.channels); 871 for (i = 0; i < tdma->nr_channels; i++) { 872 struct tegra_adma_chan *tdc = &tdma->channels[i]; 873 874 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset 875 + (cdata->ch_reg_size * i); 876 877 tdc->irq = of_irq_get(pdev->dev.of_node, i); 878 if (tdc->irq <= 0) { 879 ret = tdc->irq ?: -ENXIO; 880 goto irq_dispose; 881 } 882 883 vchan_init(&tdc->vc, &tdma->dma_dev); 884 tdc->vc.desc_free = tegra_adma_desc_free; 885 tdc->tdma = tdma; 886 } 887 888 pm_runtime_enable(&pdev->dev); 889 890 ret = pm_runtime_resume_and_get(&pdev->dev); 891 if (ret < 0) 892 goto rpm_disable; 893 894 ret = tegra_adma_init(tdma); 895 if (ret) 896 goto rpm_put; 897 898 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask); 899 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask); 900 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask); 901 902 tdma->dma_dev.dev = &pdev->dev; 903 tdma->dma_dev.device_alloc_chan_resources = 904 tegra_adma_alloc_chan_resources; 905 tdma->dma_dev.device_free_chan_resources = 906 tegra_adma_free_chan_resources; 907 tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending; 908 tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic; 909 tdma->dma_dev.device_config = tegra_adma_slave_config; 910 tdma->dma_dev.device_tx_status = tegra_adma_tx_status; 911 tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all; 912 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 913 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); 914 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); 915 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; 916 tdma->dma_dev.device_pause = tegra_adma_pause; 917 tdma->dma_dev.device_resume = tegra_adma_resume; 918 919 ret = dma_async_device_register(&tdma->dma_dev); 920 if (ret < 0) { 921 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret); 922 goto rpm_put; 923 } 924 925 ret = of_dma_controller_register(pdev->dev.of_node, 926 tegra_dma_of_xlate, tdma); 927 if (ret < 0) { 928 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret); 929 goto dma_remove; 930 } 931 932 pm_runtime_put(&pdev->dev); 933 934 dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n", 935 tdma->nr_channels); 936 937 return 0; 938 939 dma_remove: 940 dma_async_device_unregister(&tdma->dma_dev); 941 rpm_put: 942 pm_runtime_put_sync(&pdev->dev); 943 rpm_disable: 944 pm_runtime_disable(&pdev->dev); 945 irq_dispose: 946 while (--i >= 0) 947 irq_dispose_mapping(tdma->channels[i].irq); 948 949 return ret; 950 } 951 tegra_adma_remove(struct platform_device * pdev)952 static int tegra_adma_remove(struct platform_device *pdev) 953 { 954 struct tegra_adma *tdma = platform_get_drvdata(pdev); 955 int i; 956 957 of_dma_controller_free(pdev->dev.of_node); 958 dma_async_device_unregister(&tdma->dma_dev); 959 960 for (i = 0; i < tdma->nr_channels; ++i) 961 irq_dispose_mapping(tdma->channels[i].irq); 962 963 pm_runtime_disable(&pdev->dev); 964 965 return 0; 966 } 967 968 static const struct dev_pm_ops tegra_adma_dev_pm_ops = { 969 SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend, 970 tegra_adma_runtime_resume, NULL) 971 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 972 pm_runtime_force_resume) 973 }; 974 975 static struct platform_driver tegra_admac_driver = { 976 .driver = { 977 .name = "tegra-adma", 978 .pm = &tegra_adma_dev_pm_ops, 979 .of_match_table = tegra_adma_of_match, 980 }, 981 .probe = tegra_adma_probe, 982 .remove = tegra_adma_remove, 983 }; 984 985 module_platform_driver(tegra_admac_driver); 986 987 MODULE_ALIAS("platform:tegra210-adma"); 988 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver"); 989 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>"); 990 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); 991 MODULE_LICENSE("GPL v2"); 992