drivers/dma/tegra210-adma.c

   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                 free_irq(tdc->irq, tdc);
 662                 return ret;
 663         }
 664
 665         dma_cookie_init(&tdc->vc.chan);
 666
 667         return 0;
 668 }
 669
 670 static void tegra_adma_free_chan_resources(struct dma_chan *dc)
 671 {
 672         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 673
 674         tegra_adma_terminate_all(dc);
 675         vchan_free_chan_resources(&tdc->vc);
 676         tasklet_kill(&tdc->vc.task);
 677         free_irq(tdc->irq, tdc);
 678         pm_runtime_put(tdc2dev(tdc));
 679
 680         tdc->sreq_index = 0;
 681         tdc->sreq_dir = DMA_TRANS_NONE;
 682 }
 683
 684 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
 685                                            struct of_dma *ofdma)
 686 {
 687         struct tegra_adma *tdma = ofdma->of_dma_data;
 688         struct tegra_adma_chan *tdc;
 689         struct dma_chan *chan;
 690         unsigned int sreq_index;
 691
 692         if (dma_spec->args_count != 1)
 693                 return NULL;
 694
 695         sreq_index = dma_spec->args[0];
 696
 697         if (sreq_index == 0) {
 698                 dev_err(tdma->dev, "DMA request must not be 0\n");
 699                 return NULL;
 700         }
 701
 702         chan = dma_get_any_slave_channel(&tdma->dma_dev);
 703         if (!chan)
 704                 return NULL;
 705
 706         tdc = to_tegra_adma_chan(chan);
 707         tdc->sreq_index = sreq_index;
 708
 709         return chan;
 710 }
 711
 712 static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
 713 {
 714         struct tegra_adma *tdma = dev_get_drvdata(dev);
 715         struct tegra_adma_chan_regs *ch_reg;
 716         struct tegra_adma_chan *tdc;
 717         int i;
 718
 719         tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
 720         if (!tdma->global_cmd)
 721                 goto clk_disable;
 722
 723         for (i = 0; i < tdma->nr_channels; i++) {
 724                 tdc = &tdma->channels[i];
 725                 ch_reg = &tdc->ch_regs;
 726                 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
 727                 /* skip if channel is not active */
 728                 if (!ch_reg->cmd)
 729                         continue;
 730                 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
 731                 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
 732                 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
 733                 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
 734                 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
 735                 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
 736         }
 737
 738 clk_disable:
 739         clk_disable_unprepare(tdma->ahub_clk);
 740
 741         return 0;
 742 }
 743
 744 static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
 745 {
 746         struct tegra_adma *tdma = dev_get_drvdata(dev);
 747         struct tegra_adma_chan_regs *ch_reg;
 748         struct tegra_adma_chan *tdc;
 749         int ret, i;
 750
 751         ret = clk_prepare_enable(tdma->ahub_clk);
 752         if (ret) {
 753                 dev_err(dev, "ahub clk_enable failed: %d\n", ret);
 754                 return ret;
 755         }
 756         tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
 757
 758         if (!tdma->global_cmd)
 759                 return 0;
 760
 761         for (i = 0; i < tdma->nr_channels; i++) {
 762                 tdc = &tdma->channels[i];
 763                 ch_reg = &tdc->ch_regs;
 764                 /* skip if channel was not active earlier */
 765                 if (!ch_reg->cmd)
 766                         continue;
 767                 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
 768                 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
 769                 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
 770                 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
 771                 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
 772                 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
 773                 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
 774         }
 775
 776         return 0;
 777 }
 778
 779 static const struct tegra_adma_chip_data tegra210_chip_data = {
 780         .adma_get_burst_config  = tegra210_adma_get_burst_config,
 781         .global_reg_offset      = 0xc00,
 782         .global_int_clear       = 0x20,
 783         .ch_req_tx_shift        = 28,
 784         .ch_req_rx_shift        = 24,
 785         .ch_base_offset         = 0,
 786         .has_outstanding_reqs   = false,
 787         .ch_fifo_ctrl           = TEGRA210_FIFO_CTRL_DEFAULT,
 788         .ch_req_mask            = 0xf,
 789         .ch_req_max             = 10,
 790         .ch_reg_size            = 0x80,
 791         .nr_channels            = 22,
 792 };
 793
 794 static const struct tegra_adma_chip_data tegra186_chip_data = {
 795         .adma_get_burst_config  = tegra186_adma_get_burst_config,
 796         .global_reg_offset      = 0,
 797         .global_int_clear       = 0x402c,
 798         .ch_req_tx_shift        = 27,
 799         .ch_req_rx_shift        = 22,
 800         .ch_base_offset         = 0x10000,
 801         .has_outstanding_reqs   = true,
 802         .ch_fifo_ctrl           = TEGRA186_FIFO_CTRL_DEFAULT,
 803         .ch_req_mask            = 0x1f,
 804         .ch_req_max             = 20,
 805         .ch_reg_size            = 0x100,
 806         .nr_channels            = 32,
 807 };
 808
 809 static const struct of_device_id tegra_adma_of_match[] = {
 810         { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
 811         { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
 812         { },
 813 };
 814 MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
 815
 816 static int tegra_adma_probe(struct platform_device *pdev)
 817 {
 818         const struct tegra_adma_chip_data *cdata;
 819         struct tegra_adma *tdma;
 820         struct resource *res;
 821         int ret, i;
 822
 823         cdata = of_device_get_match_data(&pdev->dev);
 824         if (!cdata) {
 825                 dev_err(&pdev->dev, "device match data not found\n");
 826                 return -ENODEV;
 827         }
 828
 829         tdma = devm_kzalloc(&pdev->dev,
 830                             struct_size(tdma, channels, cdata->nr_channels),
 831                             GFP_KERNEL);
 832         if (!tdma)
 833                 return -ENOMEM;
 834
 835         tdma->dev = &pdev->dev;
 836         tdma->cdata = cdata;
 837         tdma->nr_channels = cdata->nr_channels;
 838         platform_set_drvdata(pdev, tdma);
 839
 840         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 841         tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
 842         if (IS_ERR(tdma->base_addr))
 843                 return PTR_ERR(tdma->base_addr);
 844
 845         tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
 846         if (IS_ERR(tdma->ahub_clk)) {
 847                 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
 848                 return PTR_ERR(tdma->ahub_clk);
 849         }
 850
 851         INIT_LIST_HEAD(&tdma->dma_dev.channels);
 852         for (i = 0; i < tdma->nr_channels; i++) {
 853                 struct tegra_adma_chan *tdc = &tdma->channels[i];
 854
 855                 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
 856                                  + (cdata->ch_reg_size * i);
 857
 858                 tdc->irq = of_irq_get(pdev->dev.of_node, i);
 859                 if (tdc->irq <= 0) {
 860                         ret = tdc->irq ?: -ENXIO;
 861                         goto irq_dispose;
 862                 }
 863
 864                 vchan_init(&tdc->vc, &tdma->dma_dev);
 865                 tdc->vc.desc_free = tegra_adma_desc_free;
 866                 tdc->tdma = tdma;
 867         }
 868
 869         pm_runtime_enable(&pdev->dev);
 870
 871         ret = pm_runtime_get_sync(&pdev->dev);
 872         if (ret < 0)
 873                 goto rpm_disable;
 874
 875         ret = tegra_adma_init(tdma);
 876         if (ret)
 877                 goto rpm_put;
 878
 879         dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
 880         dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
 881         dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
 882
 883         tdma->dma_dev.dev = &pdev->dev;
 884         tdma->dma_dev.device_alloc_chan_resources =
 885                                         tegra_adma_alloc_chan_resources;
 886         tdma->dma_dev.device_free_chan_resources =
 887                                         tegra_adma_free_chan_resources;
 888         tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
 889         tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
 890         tdma->dma_dev.device_config = tegra_adma_slave_config;
 891         tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
 892         tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
 893         tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 894         tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 895         tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 896         tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 897         tdma->dma_dev.device_pause = tegra_adma_pause;
 898         tdma->dma_dev.device_resume = tegra_adma_resume;
 899
 900         ret = dma_async_device_register(&tdma->dma_dev);
 901         if (ret < 0) {
 902                 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
 903                 goto rpm_put;
 904         }
 905
 906         ret = of_dma_controller_register(pdev->dev.of_node,
 907                                          tegra_dma_of_xlate, tdma);
 908         if (ret < 0) {
 909                 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
 910                 goto dma_remove;
 911         }
 912
 913         pm_runtime_put(&pdev->dev);
 914
 915         dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
 916                  tdma->nr_channels);
 917
 918         return 0;
 919
 920 dma_remove:
 921         dma_async_device_unregister(&tdma->dma_dev);
 922 rpm_put:
 923         pm_runtime_put_sync(&pdev->dev);
 924 rpm_disable:
 925         pm_runtime_disable(&pdev->dev);
 926 irq_dispose:
 927         while (--i >= 0)
 928                 irq_dispose_mapping(tdma->channels[i].irq);
 929
 930         return ret;
 931 }
 932
 933 static int tegra_adma_remove(struct platform_device *pdev)
 934 {
 935         struct tegra_adma *tdma = platform_get_drvdata(pdev);
 936         int i;
 937
 938         of_dma_controller_free(pdev->dev.of_node);
 939         dma_async_device_unregister(&tdma->dma_dev);
 940
 941         for (i = 0; i < tdma->nr_channels; ++i)
 942                 irq_dispose_mapping(tdma->channels[i].irq);
 943
 944         pm_runtime_put_sync(&pdev->dev);
 945         pm_runtime_disable(&pdev->dev);
 946
 947         return 0;
 948 }
 949
 950 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 951         SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 952                            tegra_adma_runtime_resume, NULL)
 953         SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 954                                      pm_runtime_force_resume)
 955 };
 956
 957 static struct platform_driver tegra_admac_driver = {
 958         .driver = {
 959                 .name   = "tegra-adma",
 960                 .pm     = &tegra_adma_dev_pm_ops,
 961                 .of_match_table = tegra_adma_of_match,
 962         },
 963         .probe          = tegra_adma_probe,
 964         .remove         = tegra_adma_remove,
 965 };
 966
 967 module_platform_driver(tegra_admac_driver);
 968
 969 MODULE_ALIAS("platform:tegra210-adma");
 970 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 971 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 972 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
 973 MODULE_LICENSE("GPL v2");