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.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[] __counted_by(nr_channels);
 166 };
 167
 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
 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
 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
 183 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
 184 {
 185         return readl(tdc->chan_addr + reg);
 186 }
 187
 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
 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
 199 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
 200 {
 201         return tdc->tdma->dev;
 202 }
 203
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 952 static void 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
 966 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 967         SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 968                            tegra_adma_runtime_resume, NULL)
 969         SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 970                                      pm_runtime_force_resume)
 971 };
 972
 973 static struct platform_driver tegra_admac_driver = {
 974         .driver = {
 975                 .name   = "tegra-adma",
 976                 .pm     = &tegra_adma_dev_pm_ops,
 977                 .of_match_table = tegra_adma_of_match,
 978         },
 979         .probe          = tegra_adma_probe,
 980         .remove_new     = tegra_adma_remove,
 981 };
 982
 983 module_platform_driver(tegra_admac_driver);
 984
 985 MODULE_ALIAS("platform:tegra210-adma");
 986 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 987 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 988 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
 989 MODULE_LICENSE("GPL v2");