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
 412         spin_lock(&tdc->vc.lock);
 413
 414         status = tegra_adma_irq_clear(tdc);
 415         if (status == 0 || !tdc->desc) {
 416                 spin_unlock(&tdc->vc.lock);
 417                 return IRQ_NONE;
 418         }
 419
 420         vchan_cyclic_callback(&tdc->desc->vd);
 421
 422         spin_unlock(&tdc->vc.lock);
 423
 424         return IRQ_HANDLED;
 425 }
 426
 427 static void tegra_adma_issue_pending(struct dma_chan *dc)
 428 {
 429         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 430         unsigned long flags;
 431
 432         spin_lock_irqsave(&tdc->vc.lock, flags);
 433
 434         if (vchan_issue_pending(&tdc->vc)) {
 435                 if (!tdc->desc)
 436                         tegra_adma_start(tdc);
 437         }
 438
 439         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 440 }
 441
 442 static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc)
 443 {
 444         u32 csts;
 445
 446         csts = tdma_ch_read(tdc, ADMA_CH_STATUS);
 447         csts &= ADMA_CH_STATUS_XFER_PAUSED;
 448
 449         return csts ? true : false;
 450 }
 451
 452 static int tegra_adma_pause(struct dma_chan *dc)
 453 {
 454         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 455         struct tegra_adma_desc *desc = tdc->desc;
 456         struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
 457         int dcnt = 10;
 458
 459         ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
 460         ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
 461         tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
 462
 463         while (dcnt-- && !tegra_adma_is_paused(tdc))
 464                 udelay(TEGRA_ADMA_BURST_COMPLETE_TIME);
 465
 466         if (dcnt < 0) {
 467                 dev_err(tdc2dev(tdc), "unable to pause DMA channel\n");
 468                 return -EBUSY;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int tegra_adma_resume(struct dma_chan *dc)
 475 {
 476         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 477         struct tegra_adma_desc *desc = tdc->desc;
 478         struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
 479
 480         ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
 481         ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
 482         tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
 483
 484         return 0;
 485 }
 486
 487 static int tegra_adma_terminate_all(struct dma_chan *dc)
 488 {
 489         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 490         unsigned long flags;
 491         LIST_HEAD(head);
 492
 493         spin_lock_irqsave(&tdc->vc.lock, flags);
 494
 495         if (tdc->desc)
 496                 tegra_adma_stop(tdc);
 497
 498         tegra_adma_request_free(tdc);
 499         vchan_get_all_descriptors(&tdc->vc, &head);
 500         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 501         vchan_dma_desc_free_list(&tdc->vc, &head);
 502
 503         return 0;
 504 }
 505
 506 static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
 507                                             dma_cookie_t cookie,
 508                                             struct dma_tx_state *txstate)
 509 {
 510         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 511         struct tegra_adma_desc *desc;
 512         struct virt_dma_desc *vd;
 513         enum dma_status ret;
 514         unsigned long flags;
 515         unsigned int residual;
 516
 517         ret = dma_cookie_status(dc, cookie, txstate);
 518         if (ret == DMA_COMPLETE || !txstate)
 519                 return ret;
 520
 521         spin_lock_irqsave(&tdc->vc.lock, flags);
 522
 523         vd = vchan_find_desc(&tdc->vc, cookie);
 524         if (vd) {
 525                 desc = to_tegra_adma_desc(&vd->tx);
 526                 residual = desc->ch_regs.tc;
 527         } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
 528                 residual = tegra_adma_get_residue(tdc);
 529         } else {
 530                 residual = 0;
 531         }
 532
 533         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 534
 535         dma_set_residue(txstate, residual);
 536
 537         return ret;
 538 }
 539
 540 static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size)
 541 {
 542         if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
 543                 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
 544
 545         return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
 546 }
 547
 548 static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size)
 549 {
 550         if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
 551                 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
 552
 553         return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
 554 }
 555
 556 static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
 557                                       struct tegra_adma_desc *desc,
 558                                       dma_addr_t buf_addr,
 559                                       enum dma_transfer_direction direction)
 560 {
 561         struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
 562         const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
 563         unsigned int burst_size, adma_dir;
 564
 565         if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
 566                 return -EINVAL;
 567
 568         switch (direction) {
 569         case DMA_MEM_TO_DEV:
 570                 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
 571                 burst_size = tdc->sconfig.dst_maxburst;
 572                 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
 573                 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
 574                                                       cdata->ch_req_mask,
 575                                                       cdata->ch_req_tx_shift);
 576                 ch_regs->src_addr = buf_addr;
 577                 break;
 578
 579         case DMA_DEV_TO_MEM:
 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         ch_regs->fifo_ctrl = cdata->ch_fifo_ctrl;
 602         ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
 603
 604         return tegra_adma_request_alloc(tdc, direction);
 605 }
 606
 607 static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
 608         struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
 609         size_t period_len, enum dma_transfer_direction direction,
 610         unsigned long flags)
 611 {
 612         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 613         struct tegra_adma_desc *desc = NULL;
 614
 615         if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
 616                 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
 617                 return NULL;
 618         }
 619
 620         if (buf_len % period_len) {
 621                 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
 622                 return NULL;
 623         }
 624
 625         if (!IS_ALIGNED(buf_addr, 4)) {
 626                 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
 627                 return NULL;
 628         }
 629
 630         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 631         if (!desc)
 632                 return NULL;
 633
 634         desc->buf_len = buf_len;
 635         desc->period_len = period_len;
 636         desc->num_periods = buf_len / period_len;
 637
 638         if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
 639                 kfree(desc);
 640                 return NULL;
 641         }
 642
 643         return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
 644 }
 645
 646 static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
 647 {
 648         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 649         int ret;
 650
 651         ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
 652         if (ret) {
 653                 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
 654                         dma_chan_name(dc));
 655                 return ret;
 656         }
 657
 658         ret = pm_runtime_resume_and_get(tdc2dev(tdc));
 659         if (ret < 0) {
 660                 free_irq(tdc->irq, tdc);
 661                 return ret;
 662         }
 663
 664         dma_cookie_init(&tdc->vc.chan);
 665
 666         return 0;
 667 }
 668
 669 static void tegra_adma_free_chan_resources(struct dma_chan *dc)
 670 {
 671         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 672
 673         tegra_adma_terminate_all(dc);
 674         vchan_free_chan_resources(&tdc->vc);
 675         tasklet_kill(&tdc->vc.task);
 676         free_irq(tdc->irq, tdc);
 677         pm_runtime_put(tdc2dev(tdc));
 678
 679         tdc->sreq_index = 0;
 680         tdc->sreq_dir = DMA_TRANS_NONE;
 681 }
 682
 683 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
 684                                            struct of_dma *ofdma)
 685 {
 686         struct tegra_adma *tdma = ofdma->of_dma_data;
 687         struct tegra_adma_chan *tdc;
 688         struct dma_chan *chan;
 689         unsigned int sreq_index;
 690
 691         if (dma_spec->args_count != 1)
 692                 return NULL;
 693
 694         sreq_index = dma_spec->args[0];
 695
 696         if (sreq_index == 0) {
 697                 dev_err(tdma->dev, "DMA request must not be 0\n");
 698                 return NULL;
 699         }
 700
 701         chan = dma_get_any_slave_channel(&tdma->dma_dev);
 702         if (!chan)
 703                 return NULL;
 704
 705         tdc = to_tegra_adma_chan(chan);
 706         tdc->sreq_index = sreq_index;
 707
 708         return chan;
 709 }
 710
 711 static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
 712 {
 713         struct tegra_adma *tdma = dev_get_drvdata(dev);
 714         struct tegra_adma_chan_regs *ch_reg;
 715         struct tegra_adma_chan *tdc;
 716         int i;
 717
 718         tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
 719         if (!tdma->global_cmd)
 720                 goto clk_disable;
 721
 722         for (i = 0; i < tdma->nr_channels; i++) {
 723                 tdc = &tdma->channels[i];
 724                 ch_reg = &tdc->ch_regs;
 725                 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
 726                 /* skip if channel is not active */
 727                 if (!ch_reg->cmd)
 728                         continue;
 729                 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
 730                 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
 731                 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
 732                 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
 733                 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
 734                 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
 735         }
 736
 737 clk_disable:
 738         clk_disable_unprepare(tdma->ahub_clk);
 739
 740         return 0;
 741 }
 742
 743 static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
 744 {
 745         struct tegra_adma *tdma = dev_get_drvdata(dev);
 746         struct tegra_adma_chan_regs *ch_reg;
 747         struct tegra_adma_chan *tdc;
 748         int ret, i;
 749
 750         ret = clk_prepare_enable(tdma->ahub_clk);
 751         if (ret) {
 752                 dev_err(dev, "ahub clk_enable failed: %d\n", ret);
 753                 return ret;
 754         }
 755         tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
 756
 757         if (!tdma->global_cmd)
 758                 return 0;
 759
 760         for (i = 0; i < tdma->nr_channels; i++) {
 761                 tdc = &tdma->channels[i];
 762                 ch_reg = &tdc->ch_regs;
 763                 /* skip if channel was not active earlier */
 764                 if (!ch_reg->cmd)
 765                         continue;
 766                 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
 767                 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
 768                 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
 769                 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
 770                 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
 771                 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
 772                 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
 773         }
 774
 775         return 0;
 776 }
 777
 778 static const struct tegra_adma_chip_data tegra210_chip_data = {
 779         .adma_get_burst_config  = tegra210_adma_get_burst_config,
 780         .global_reg_offset      = 0xc00,
 781         .global_int_clear       = 0x20,
 782         .ch_req_tx_shift        = 28,
 783         .ch_req_rx_shift        = 24,
 784         .ch_base_offset         = 0,
 785         .has_outstanding_reqs   = false,
 786         .ch_fifo_ctrl           = TEGRA210_FIFO_CTRL_DEFAULT,
 787         .ch_req_mask            = 0xf,
 788         .ch_req_max             = 10,
 789         .ch_reg_size            = 0x80,
 790         .nr_channels            = 22,
 791 };
 792
 793 static const struct tegra_adma_chip_data tegra186_chip_data = {
 794         .adma_get_burst_config  = tegra186_adma_get_burst_config,
 795         .global_reg_offset      = 0,
 796         .global_int_clear       = 0x402c,
 797         .ch_req_tx_shift        = 27,
 798         .ch_req_rx_shift        = 22,
 799         .ch_base_offset         = 0x10000,
 800         .has_outstanding_reqs   = true,
 801         .ch_fifo_ctrl           = TEGRA186_FIFO_CTRL_DEFAULT,
 802         .ch_req_mask            = 0x1f,
 803         .ch_req_max             = 20,
 804         .ch_reg_size            = 0x100,
 805         .nr_channels            = 32,
 806 };
 807
 808 static const struct of_device_id tegra_adma_of_match[] = {
 809         { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
 810         { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
 811         { },
 812 };
 813 MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
 814
 815 static int tegra_adma_probe(struct platform_device *pdev)
 816 {
 817         const struct tegra_adma_chip_data *cdata;
 818         struct tegra_adma *tdma;
 819         struct resource *res;
 820         int ret, i;
 821
 822         cdata = of_device_get_match_data(&pdev->dev);
 823         if (!cdata) {
 824                 dev_err(&pdev->dev, "device match data not found\n");
 825                 return -ENODEV;
 826         }
 827
 828         tdma = devm_kzalloc(&pdev->dev,
 829                             struct_size(tdma, channels, cdata->nr_channels),
 830                             GFP_KERNEL);
 831         if (!tdma)
 832                 return -ENOMEM;
 833
 834         tdma->dev = &pdev->dev;
 835         tdma->cdata = cdata;
 836         tdma->nr_channels = cdata->nr_channels;
 837         platform_set_drvdata(pdev, tdma);
 838
 839         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 840         tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
 841         if (IS_ERR(tdma->base_addr))
 842                 return PTR_ERR(tdma->base_addr);
 843
 844         tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
 845         if (IS_ERR(tdma->ahub_clk)) {
 846                 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
 847                 return PTR_ERR(tdma->ahub_clk);
 848         }
 849
 850         INIT_LIST_HEAD(&tdma->dma_dev.channels);
 851         for (i = 0; i < tdma->nr_channels; i++) {
 852                 struct tegra_adma_chan *tdc = &tdma->channels[i];
 853
 854                 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
 855                                  + (cdata->ch_reg_size * i);
 856
 857                 tdc->irq = of_irq_get(pdev->dev.of_node, i);
 858                 if (tdc->irq <= 0) {
 859                         ret = tdc->irq ?: -ENXIO;
 860                         goto irq_dispose;
 861                 }
 862
 863                 vchan_init(&tdc->vc, &tdma->dma_dev);
 864                 tdc->vc.desc_free = tegra_adma_desc_free;
 865                 tdc->tdma = tdma;
 866         }
 867
 868         pm_runtime_enable(&pdev->dev);
 869
 870         ret = pm_runtime_get_sync(&pdev->dev);
 871         if (ret < 0)
 872                 goto rpm_disable;
 873
 874         ret = tegra_adma_init(tdma);
 875         if (ret)
 876                 goto rpm_put;
 877
 878         dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
 879         dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
 880         dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
 881
 882         tdma->dma_dev.dev = &pdev->dev;
 883         tdma->dma_dev.device_alloc_chan_resources =
 884                                         tegra_adma_alloc_chan_resources;
 885         tdma->dma_dev.device_free_chan_resources =
 886                                         tegra_adma_free_chan_resources;
 887         tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
 888         tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
 889         tdma->dma_dev.device_config = tegra_adma_slave_config;
 890         tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
 891         tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
 892         tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 893         tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 894         tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 895         tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 896         tdma->dma_dev.device_pause = tegra_adma_pause;
 897         tdma->dma_dev.device_resume = tegra_adma_resume;
 898
 899         ret = dma_async_device_register(&tdma->dma_dev);
 900         if (ret < 0) {
 901                 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
 902                 goto rpm_put;
 903         }
 904
 905         ret = of_dma_controller_register(pdev->dev.of_node,
 906                                          tegra_dma_of_xlate, tdma);
 907         if (ret < 0) {
 908                 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
 909                 goto dma_remove;
 910         }
 911
 912         pm_runtime_put(&pdev->dev);
 913
 914         dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
 915                  tdma->nr_channels);
 916
 917         return 0;
 918
 919 dma_remove:
 920         dma_async_device_unregister(&tdma->dma_dev);
 921 rpm_put:
 922         pm_runtime_put_sync(&pdev->dev);
 923 rpm_disable:
 924         pm_runtime_disable(&pdev->dev);
 925 irq_dispose:
 926         while (--i >= 0)
 927                 irq_dispose_mapping(tdma->channels[i].irq);
 928
 929         return ret;
 930 }
 931
 932 static int tegra_adma_remove(struct platform_device *pdev)
 933 {
 934         struct tegra_adma *tdma = platform_get_drvdata(pdev);
 935         int i;
 936
 937         of_dma_controller_free(pdev->dev.of_node);
 938         dma_async_device_unregister(&tdma->dma_dev);
 939
 940         for (i = 0; i < tdma->nr_channels; ++i)
 941                 irq_dispose_mapping(tdma->channels[i].irq);
 942
 943         pm_runtime_put_sync(&pdev->dev);
 944         pm_runtime_disable(&pdev->dev);
 945
 946         return 0;
 947 }
 948
 949 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 950         SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 951                            tegra_adma_runtime_resume, NULL)
 952         SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 953                                      pm_runtime_force_resume)
 954 };
 955
 956 static struct platform_driver tegra_admac_driver = {
 957         .driver = {
 958                 .name   = "tegra-adma",
 959                 .pm     = &tegra_adma_dev_pm_ops,
 960                 .of_match_table = tegra_adma_of_match,
 961         },
 962         .probe          = tegra_adma_probe,
 963         .remove         = tegra_adma_remove,
 964 };
 965
 966 module_platform_driver(tegra_admac_driver);
 967
 968 MODULE_ALIAS("platform:tegra210-adma");
 969 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 970 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 971 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
 972 MODULE_LICENSE("GPL v2");