drivers/dma/tegra210-adma.c

   1 /*
   2  * ADMA driver for Nvidia's Tegra210 ADMA controller.
   3  *
   4  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/iopoll.h>
  21 #include <linux/module.h>
  22 #include <linux/of_device.h>
  23 #include <linux/of_dma.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/pm_clock.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/slab.h>
  28
  29 #include "virt-dma.h"
  30
  31 #define ADMA_CH_CMD                                     0x00
  32 #define ADMA_CH_STATUS                                  0x0c
  33 #define ADMA_CH_STATUS_XFER_EN                          BIT(0)
  34
  35 #define ADMA_CH_INT_STATUS                              0x10
  36 #define ADMA_CH_INT_STATUS_XFER_DONE                    BIT(0)
  37
  38 #define ADMA_CH_INT_CLEAR                               0x1c
  39 #define ADMA_CH_CTRL                                    0x24
  40 #define ADMA_CH_CTRL_TX_REQ(val)                        (((val) & 0xf) << 28)
  41 #define ADMA_CH_CTRL_TX_REQ_MAX                         10
  42 #define ADMA_CH_CTRL_RX_REQ(val)                        (((val) & 0xf) << 24)
  43 #define ADMA_CH_CTRL_RX_REQ_MAX                         10
  44 #define ADMA_CH_CTRL_DIR(val)                           (((val) & 0xf) << 12)
  45 #define ADMA_CH_CTRL_DIR_AHUB2MEM                       2
  46 #define ADMA_CH_CTRL_DIR_MEM2AHUB                       4
  47 #define ADMA_CH_CTRL_MODE_CONTINUOUS                    (2 << 8)
  48 #define ADMA_CH_CTRL_FLOWCTRL_EN                        BIT(1)
  49
  50 #define ADMA_CH_CONFIG                                  0x28
  51 #define ADMA_CH_CONFIG_SRC_BUF(val)                     (((val) & 0x7) << 28)
  52 #define ADMA_CH_CONFIG_TRG_BUF(val)                     (((val) & 0x7) << 24)
  53 #define ADMA_CH_CONFIG_BURST_SIZE(val)                  (((val) & 0x7) << 20)
  54 #define ADMA_CH_CONFIG_BURST_16                         5
  55 #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val)              ((val) & 0xf)
  56 #define ADMA_CH_CONFIG_MAX_BUFS                         8
  57
  58 #define ADMA_CH_FIFO_CTRL                               0x2c
  59 #define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val)              (((val) & 0xf) << 24)
  60 #define ADMA_CH_FIFO_CTRL_STARV_THRES(val)              (((val) & 0xf) << 16)
  61 #define ADMA_CH_FIFO_CTRL_TX_SIZE(val)                  (((val) & 0xf) << 8)
  62 #define ADMA_CH_FIFO_CTRL_RX_SIZE(val)                  ((val) & 0xf)
  63
  64 #define ADMA_CH_LOWER_SRC_ADDR                          0x34
  65 #define ADMA_CH_LOWER_TRG_ADDR                          0x3c
  66 #define ADMA_CH_TC                                      0x44
  67 #define ADMA_CH_TC_COUNT_MASK                           0x3ffffffc
  68
  69 #define ADMA_CH_XFER_STATUS                             0x54
  70 #define ADMA_CH_XFER_STATUS_COUNT_MASK                  0xffff
  71
  72 #define ADMA_GLOBAL_CMD                                 0xc00
  73 #define ADMA_GLOBAL_SOFT_RESET                          0xc04
  74 #define ADMA_GLOBAL_INT_CLEAR                           0xc20
  75 #define ADMA_GLOBAL_CTRL                                0xc24
  76
  77 #define ADMA_CH_REG_OFFSET(a)                           (a * 0x80)
  78
  79 #define ADMA_CH_FIFO_CTRL_DEFAULT       (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \
  80                                          ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \
  81                                          ADMA_CH_FIFO_CTRL_TX_SIZE(3)     | \
  82                                          ADMA_CH_FIFO_CTRL_RX_SIZE(3))
  83 struct tegra_adma;
  84
  85 /*
  86  * struct tegra_adma_chip_data - Tegra chip specific data
  87  * @nr_channels: Number of DMA channels available.
  88  */
  89 struct tegra_adma_chip_data {
  90         int nr_channels;
  91 };
  92
  93 /*
  94  * struct tegra_adma_chan_regs - Tegra ADMA channel registers
  95  */
  96 struct tegra_adma_chan_regs {
  97         unsigned int ctrl;
  98         unsigned int config;
  99         unsigned int src_addr;
 100         unsigned int trg_addr;
 101         unsigned int fifo_ctrl;
 102         unsigned int tc;
 103 };
 104
 105 /*
 106  * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
 107  */
 108 struct tegra_adma_desc {
 109         struct virt_dma_desc            vd;
 110         struct tegra_adma_chan_regs     ch_regs;
 111         size_t                          buf_len;
 112         size_t                          period_len;
 113         size_t                          num_periods;
 114 };
 115
 116 /*
 117  * struct tegra_adma_chan - Tegra ADMA channel information
 118  */
 119 struct tegra_adma_chan {
 120         struct virt_dma_chan            vc;
 121         struct tegra_adma_desc          *desc;
 122         struct tegra_adma               *tdma;
 123         int                             irq;
 124         void __iomem                    *chan_addr;
 125
 126         /* Slave channel configuration info */
 127         struct dma_slave_config         sconfig;
 128         enum dma_transfer_direction     sreq_dir;
 129         unsigned int                    sreq_index;
 130         bool                            sreq_reserved;
 131
 132         /* Transfer count and position info */
 133         unsigned int                    tx_buf_count;
 134         unsigned int                    tx_buf_pos;
 135 };
 136
 137 /*
 138  * struct tegra_adma - Tegra ADMA controller information
 139  */
 140 struct tegra_adma {
 141         struct dma_device               dma_dev;
 142         struct device                   *dev;
 143         void __iomem                    *base_addr;
 144         unsigned int                    nr_channels;
 145         unsigned long                   rx_requests_reserved;
 146         unsigned long                   tx_requests_reserved;
 147
 148         /* Used to store global command register state when suspending */
 149         unsigned int                    global_cmd;
 150
 151         /* Last member of the structure */
 152         struct tegra_adma_chan          channels[0];
 153 };
 154
 155 static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
 156 {
 157         writel(val, tdma->base_addr + reg);
 158 }
 159
 160 static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
 161 {
 162         return readl(tdma->base_addr + reg);
 163 }
 164
 165 static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
 166 {
 167         writel(val, tdc->chan_addr + reg);
 168 }
 169
 170 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
 171 {
 172         return readl(tdc->chan_addr + reg);
 173 }
 174
 175 static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
 176 {
 177         return container_of(dc, struct tegra_adma_chan, vc.chan);
 178 }
 179
 180 static inline struct tegra_adma_desc *to_tegra_adma_desc(
 181                 struct dma_async_tx_descriptor *td)
 182 {
 183         return container_of(td, struct tegra_adma_desc, vd.tx);
 184 }
 185
 186 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
 187 {
 188         return tdc->tdma->dev;
 189 }
 190
 191 static void tegra_adma_desc_free(struct virt_dma_desc *vd)
 192 {
 193         kfree(container_of(vd, struct tegra_adma_desc, vd));
 194 }
 195
 196 static int tegra_adma_slave_config(struct dma_chan *dc,
 197                                    struct dma_slave_config *sconfig)
 198 {
 199         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 200
 201         memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
 202
 203         return 0;
 204 }
 205
 206 static int tegra_adma_init(struct tegra_adma *tdma)
 207 {
 208         u32 status;
 209         int ret;
 210
 211         /* Clear any interrupts */
 212         tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
 213
 214         /* Assert soft reset */
 215         tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
 216
 217         /* Wait for reset to clear */
 218         ret = readx_poll_timeout(readl,
 219                                  tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
 220                                  status, status == 0, 20, 10000);
 221         if (ret)
 222                 return ret;
 223
 224         /* Enable global ADMA registers */
 225         tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
 226
 227         return 0;
 228 }
 229
 230 static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
 231                                     enum dma_transfer_direction direction)
 232 {
 233         struct tegra_adma *tdma = tdc->tdma;
 234         unsigned int sreq_index = tdc->sreq_index;
 235
 236         if (tdc->sreq_reserved)
 237                 return tdc->sreq_dir == direction ? 0 : -EINVAL;
 238
 239         switch (direction) {
 240         case DMA_MEM_TO_DEV:
 241                 if (sreq_index > ADMA_CH_CTRL_TX_REQ_MAX) {
 242                         dev_err(tdma->dev, "invalid DMA request\n");
 243                         return -EINVAL;
 244                 }
 245
 246                 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
 247                         dev_err(tdma->dev, "DMA request reserved\n");
 248                         return -EINVAL;
 249                 }
 250                 break;
 251
 252         case DMA_DEV_TO_MEM:
 253                 if (sreq_index > ADMA_CH_CTRL_RX_REQ_MAX) {
 254                         dev_err(tdma->dev, "invalid DMA request\n");
 255                         return -EINVAL;
 256                 }
 257
 258                 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
 259                         dev_err(tdma->dev, "DMA request reserved\n");
 260                         return -EINVAL;
 261                 }
 262                 break;
 263
 264         default:
 265                 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
 266                          dma_chan_name(&tdc->vc.chan));
 267                 return -EINVAL;
 268         }
 269
 270         tdc->sreq_dir = direction;
 271         tdc->sreq_reserved = true;
 272
 273         return 0;
 274 }
 275
 276 static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
 277 {
 278         struct tegra_adma *tdma = tdc->tdma;
 279
 280         if (!tdc->sreq_reserved)
 281                 return;
 282
 283         switch (tdc->sreq_dir) {
 284         case DMA_MEM_TO_DEV:
 285                 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
 286                 break;
 287
 288         case DMA_DEV_TO_MEM:
 289                 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
 290                 break;
 291
 292         default:
 293                 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
 294                          dma_chan_name(&tdc->vc.chan));
 295                 return;
 296         }
 297
 298         tdc->sreq_reserved = false;
 299 }
 300
 301 static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
 302 {
 303         u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
 304
 305         return status & ADMA_CH_INT_STATUS_XFER_DONE;
 306 }
 307
 308 static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
 309 {
 310         u32 status = tegra_adma_irq_status(tdc);
 311
 312         if (status)
 313                 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
 314
 315         return status;
 316 }
 317
 318 static void tegra_adma_stop(struct tegra_adma_chan *tdc)
 319 {
 320         unsigned int status;
 321
 322         /* Disable ADMA */
 323         tdma_ch_write(tdc, ADMA_CH_CMD, 0);
 324
 325         /* Clear interrupt status */
 326         tegra_adma_irq_clear(tdc);
 327
 328         if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
 329                         status, !(status & ADMA_CH_STATUS_XFER_EN),
 330                         20, 10000)) {
 331                 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
 332                 return;
 333         }
 334
 335         kfree(tdc->desc);
 336         tdc->desc = NULL;
 337 }
 338
 339 static void tegra_adma_start(struct tegra_adma_chan *tdc)
 340 {
 341         struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
 342         struct tegra_adma_chan_regs *ch_regs;
 343         struct tegra_adma_desc *desc;
 344
 345         if (!vd)
 346                 return;
 347
 348         list_del(&vd->node);
 349
 350         desc = to_tegra_adma_desc(&vd->tx);
 351
 352         if (!desc) {
 353                 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
 354                 return;
 355         }
 356
 357         ch_regs = &desc->ch_regs;
 358
 359         tdc->tx_buf_pos = 0;
 360         tdc->tx_buf_count = 0;
 361         tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
 362         tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
 363         tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
 364         tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
 365         tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
 366         tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
 367
 368         /* Start ADMA */
 369         tdma_ch_write(tdc, ADMA_CH_CMD, 1);
 370
 371         tdc->desc = desc;
 372 }
 373
 374 static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
 375 {
 376         struct tegra_adma_desc *desc = tdc->desc;
 377         unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
 378         unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
 379         unsigned int periods_remaining;
 380
 381         /*
 382          * Handle wrap around of buffer count register
 383          */
 384         if (pos < tdc->tx_buf_pos)
 385                 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
 386         else
 387                 tdc->tx_buf_count += pos - tdc->tx_buf_pos;
 388
 389         periods_remaining = tdc->tx_buf_count % desc->num_periods;
 390         tdc->tx_buf_pos = pos;
 391
 392         return desc->buf_len - (periods_remaining * desc->period_len);
 393 }
 394
 395 static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
 396 {
 397         struct tegra_adma_chan *tdc = dev_id;
 398         unsigned long status;
 399         unsigned long flags;
 400
 401         spin_lock_irqsave(&tdc->vc.lock, flags);
 402
 403         status = tegra_adma_irq_clear(tdc);
 404         if (status == 0 || !tdc->desc) {
 405                 spin_unlock_irqrestore(&tdc->vc.lock, flags);
 406                 return IRQ_NONE;
 407         }
 408
 409         vchan_cyclic_callback(&tdc->desc->vd);
 410
 411         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 412
 413         return IRQ_HANDLED;
 414 }
 415
 416 static void tegra_adma_issue_pending(struct dma_chan *dc)
 417 {
 418         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 419         unsigned long flags;
 420
 421         spin_lock_irqsave(&tdc->vc.lock, flags);
 422
 423         if (vchan_issue_pending(&tdc->vc)) {
 424                 if (!tdc->desc)
 425                         tegra_adma_start(tdc);
 426         }
 427
 428         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 429 }
 430
 431 static int tegra_adma_terminate_all(struct dma_chan *dc)
 432 {
 433         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 434         unsigned long flags;
 435         LIST_HEAD(head);
 436
 437         spin_lock_irqsave(&tdc->vc.lock, flags);
 438
 439         if (tdc->desc)
 440                 tegra_adma_stop(tdc);
 441
 442         tegra_adma_request_free(tdc);
 443         vchan_get_all_descriptors(&tdc->vc, &head);
 444         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 445         vchan_dma_desc_free_list(&tdc->vc, &head);
 446
 447         return 0;
 448 }
 449
 450 static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
 451                                             dma_cookie_t cookie,
 452                                             struct dma_tx_state *txstate)
 453 {
 454         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 455         struct tegra_adma_desc *desc;
 456         struct virt_dma_desc *vd;
 457         enum dma_status ret;
 458         unsigned long flags;
 459         unsigned int residual;
 460
 461         ret = dma_cookie_status(dc, cookie, txstate);
 462         if (ret == DMA_COMPLETE || !txstate)
 463                 return ret;
 464
 465         spin_lock_irqsave(&tdc->vc.lock, flags);
 466
 467         vd = vchan_find_desc(&tdc->vc, cookie);
 468         if (vd) {
 469                 desc = to_tegra_adma_desc(&vd->tx);
 470                 residual = desc->ch_regs.tc;
 471         } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
 472                 residual = tegra_adma_get_residue(tdc);
 473         } else {
 474                 residual = 0;
 475         }
 476
 477         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 478
 479         dma_set_residue(txstate, residual);
 480
 481         return ret;
 482 }
 483
 484 static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
 485                                       struct tegra_adma_desc *desc,
 486                                       dma_addr_t buf_addr,
 487                                       enum dma_transfer_direction direction)
 488 {
 489         struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
 490         unsigned int burst_size, adma_dir;
 491
 492         if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
 493                 return -EINVAL;
 494
 495         switch (direction) {
 496         case DMA_MEM_TO_DEV:
 497                 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
 498                 burst_size = fls(tdc->sconfig.dst_maxburst);
 499                 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
 500                 ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->sreq_index);
 501                 ch_regs->src_addr = buf_addr;
 502                 break;
 503
 504         case DMA_DEV_TO_MEM:
 505                 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
 506                 burst_size = fls(tdc->sconfig.src_maxburst);
 507                 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
 508                 ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
 509                 ch_regs->trg_addr = buf_addr;
 510                 break;
 511
 512         default:
 513                 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
 514                 return -EINVAL;
 515         }
 516
 517         if (!burst_size || burst_size > ADMA_CH_CONFIG_BURST_16)
 518                 burst_size = ADMA_CH_CONFIG_BURST_16;
 519
 520         ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
 521                          ADMA_CH_CTRL_MODE_CONTINUOUS |
 522                          ADMA_CH_CTRL_FLOWCTRL_EN;
 523         ch_regs->config |= ADMA_CH_CONFIG_BURST_SIZE(burst_size);
 524         ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
 525         ch_regs->fifo_ctrl = ADMA_CH_FIFO_CTRL_DEFAULT;
 526         ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
 527
 528         return tegra_adma_request_alloc(tdc, direction);
 529 }
 530
 531 static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
 532         struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
 533         size_t period_len, enum dma_transfer_direction direction,
 534         unsigned long flags)
 535 {
 536         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 537         struct tegra_adma_desc *desc = NULL;
 538
 539         if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
 540                 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
 541                 return NULL;
 542         }
 543
 544         if (buf_len % period_len) {
 545                 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
 546                 return NULL;
 547         }
 548
 549         if (!IS_ALIGNED(buf_addr, 4)) {
 550                 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
 551                 return NULL;
 552         }
 553
 554         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 555         if (!desc)
 556                 return NULL;
 557
 558         desc->buf_len = buf_len;
 559         desc->period_len = period_len;
 560         desc->num_periods = buf_len / period_len;
 561
 562         if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
 563                 kfree(desc);
 564                 return NULL;
 565         }
 566
 567         return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
 568 }
 569
 570 static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
 571 {
 572         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 573         int ret;
 574
 575         ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
 576         if (ret) {
 577                 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
 578                         dma_chan_name(dc));
 579                 return ret;
 580         }
 581
 582         ret = pm_runtime_get_sync(tdc2dev(tdc));
 583         if (ret < 0) {
 584                 free_irq(tdc->irq, tdc);
 585                 return ret;
 586         }
 587
 588         dma_cookie_init(&tdc->vc.chan);
 589
 590         return 0;
 591 }
 592
 593 static void tegra_adma_free_chan_resources(struct dma_chan *dc)
 594 {
 595         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 596
 597         tegra_adma_terminate_all(dc);
 598         vchan_free_chan_resources(&tdc->vc);
 599         tasklet_kill(&tdc->vc.task);
 600         free_irq(tdc->irq, tdc);
 601         pm_runtime_put(tdc2dev(tdc));
 602
 603         tdc->sreq_index = 0;
 604         tdc->sreq_dir = DMA_TRANS_NONE;
 605 }
 606
 607 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
 608                                            struct of_dma *ofdma)
 609 {
 610         struct tegra_adma *tdma = ofdma->of_dma_data;
 611         struct tegra_adma_chan *tdc;
 612         struct dma_chan *chan;
 613         unsigned int sreq_index;
 614
 615         if (dma_spec->args_count != 1)
 616                 return NULL;
 617
 618         sreq_index = dma_spec->args[0];
 619
 620         if (sreq_index == 0) {
 621                 dev_err(tdma->dev, "DMA request must not be 0\n");
 622                 return NULL;
 623         }
 624
 625         chan = dma_get_any_slave_channel(&tdma->dma_dev);
 626         if (!chan)
 627                 return NULL;
 628
 629         tdc = to_tegra_adma_chan(chan);
 630         tdc->sreq_index = sreq_index;
 631
 632         return chan;
 633 }
 634
 635 static int tegra_adma_runtime_suspend(struct device *dev)
 636 {
 637         struct tegra_adma *tdma = dev_get_drvdata(dev);
 638
 639         tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
 640
 641         return pm_clk_suspend(dev);
 642 }
 643
 644 static int tegra_adma_runtime_resume(struct device *dev)
 645 {
 646         struct tegra_adma *tdma = dev_get_drvdata(dev);
 647         int ret;
 648
 649         ret = pm_clk_resume(dev);
 650         if (ret)
 651                 return ret;
 652
 653         tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
 654
 655         return 0;
 656 }
 657
 658 static const struct tegra_adma_chip_data tegra210_chip_data = {
 659         .nr_channels = 22,
 660 };
 661
 662 static const struct of_device_id tegra_adma_of_match[] = {
 663         { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
 664         { },
 665 };
 666 MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
 667
 668 static int tegra_adma_probe(struct platform_device *pdev)
 669 {
 670         const struct tegra_adma_chip_data *cdata;
 671         struct tegra_adma *tdma;
 672         struct resource *res;
 673         int ret, i;
 674
 675         cdata = of_device_get_match_data(&pdev->dev);
 676         if (!cdata) {
 677                 dev_err(&pdev->dev, "device match data not found\n");
 678                 return -ENODEV;
 679         }
 680
 681         tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
 682                             sizeof(struct tegra_adma_chan), GFP_KERNEL);
 683         if (!tdma)
 684                 return -ENOMEM;
 685
 686         tdma->dev = &pdev->dev;
 687         tdma->nr_channels = cdata->nr_channels;
 688         platform_set_drvdata(pdev, tdma);
 689
 690         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 691         tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
 692         if (IS_ERR(tdma->base_addr))
 693                 return PTR_ERR(tdma->base_addr);
 694
 695         ret = pm_clk_create(&pdev->dev);
 696         if (ret)
 697                 return ret;
 698
 699         ret = of_pm_clk_add_clk(&pdev->dev, "d_audio");
 700         if (ret)
 701                 goto clk_destroy;
 702
 703         pm_runtime_enable(&pdev->dev);
 704
 705         ret = pm_runtime_get_sync(&pdev->dev);
 706         if (ret < 0)
 707                 goto rpm_disable;
 708
 709         ret = tegra_adma_init(tdma);
 710         if (ret)
 711                 goto rpm_put;
 712
 713         INIT_LIST_HEAD(&tdma->dma_dev.channels);
 714         for (i = 0; i < tdma->nr_channels; i++) {
 715                 struct tegra_adma_chan *tdc = &tdma->channels[i];
 716
 717                 tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
 718
 719                 tdc->irq = of_irq_get(pdev->dev.of_node, i);
 720                 if (tdc->irq < 0) {
 721                         ret = tdc->irq;
 722                         goto irq_dispose;
 723                 }
 724
 725                 vchan_init(&tdc->vc, &tdma->dma_dev);
 726                 tdc->vc.desc_free = tegra_adma_desc_free;
 727                 tdc->tdma = tdma;
 728         }
 729
 730         dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
 731         dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
 732         dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
 733
 734         tdma->dma_dev.dev = &pdev->dev;
 735         tdma->dma_dev.device_alloc_chan_resources =
 736                                         tegra_adma_alloc_chan_resources;
 737         tdma->dma_dev.device_free_chan_resources =
 738                                         tegra_adma_free_chan_resources;
 739         tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
 740         tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
 741         tdma->dma_dev.device_config = tegra_adma_slave_config;
 742         tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
 743         tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
 744         tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 745         tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 746         tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 747         tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 748
 749         ret = dma_async_device_register(&tdma->dma_dev);
 750         if (ret < 0) {
 751                 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
 752                 goto irq_dispose;
 753         }
 754
 755         ret = of_dma_controller_register(pdev->dev.of_node,
 756                                          tegra_dma_of_xlate, tdma);
 757         if (ret < 0) {
 758                 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
 759                 goto dma_remove;
 760         }
 761
 762         pm_runtime_put(&pdev->dev);
 763
 764         dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
 765                  tdma->nr_channels);
 766
 767         return 0;
 768
 769 dma_remove:
 770         dma_async_device_unregister(&tdma->dma_dev);
 771 irq_dispose:
 772         while (--i >= 0)
 773                 irq_dispose_mapping(tdma->channels[i].irq);
 774 rpm_put:
 775         pm_runtime_put_sync(&pdev->dev);
 776 rpm_disable:
 777         pm_runtime_disable(&pdev->dev);
 778 clk_destroy:
 779         pm_clk_destroy(&pdev->dev);
 780
 781         return ret;
 782 }
 783
 784 static int tegra_adma_remove(struct platform_device *pdev)
 785 {
 786         struct tegra_adma *tdma = platform_get_drvdata(pdev);
 787         int i;
 788
 789         dma_async_device_unregister(&tdma->dma_dev);
 790
 791         for (i = 0; i < tdma->nr_channels; ++i)
 792                 irq_dispose_mapping(tdma->channels[i].irq);
 793
 794         pm_runtime_put_sync(&pdev->dev);
 795         pm_runtime_disable(&pdev->dev);
 796         pm_clk_destroy(&pdev->dev);
 797
 798         return 0;
 799 }
 800
 801 #ifdef CONFIG_PM_SLEEP
 802 static int tegra_adma_pm_suspend(struct device *dev)
 803 {
 804         return pm_runtime_suspended(dev) == false;
 805 }
 806 #endif
 807
 808 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 809         SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 810                            tegra_adma_runtime_resume, NULL)
 811         SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
 812 };
 813
 814 static struct platform_driver tegra_admac_driver = {
 815         .driver = {
 816                 .name   = "tegra-adma",
 817                 .pm     = &tegra_adma_dev_pm_ops,
 818                 .of_match_table = tegra_adma_of_match,
 819         },
 820         .probe          = tegra_adma_probe,
 821         .remove         = tegra_adma_remove,
 822 };
 823
 824 module_platform_driver(tegra_admac_driver);
 825
 826 MODULE_ALIAS("platform:tegra210-adma");
 827 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 828 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 829 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
 830 MODULE_LICENSE("GPL v2");