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_runtime.h>
  26 #include <linux/slab.h>
  27
  28 #include "virt-dma.h"
  29
  30 #define ADMA_CH_CMD                                     0x00
  31 #define ADMA_CH_STATUS                                  0x0c
  32 #define ADMA_CH_STATUS_XFER_EN                          BIT(0)
  33
  34 #define ADMA_CH_INT_STATUS                              0x10
  35 #define ADMA_CH_INT_STATUS_XFER_DONE                    BIT(0)
  36
  37 #define ADMA_CH_INT_CLEAR                               0x1c
  38 #define ADMA_CH_CTRL                                    0x24
  39 #define ADMA_CH_CTRL_TX_REQ(val)                        (((val) & 0xf) << 28)
  40 #define ADMA_CH_CTRL_TX_REQ_MAX                         10
  41 #define ADMA_CH_CTRL_RX_REQ(val)                        (((val) & 0xf) << 24)
  42 #define ADMA_CH_CTRL_RX_REQ_MAX                         10
  43 #define ADMA_CH_CTRL_DIR(val)                           (((val) & 0xf) << 12)
  44 #define ADMA_CH_CTRL_DIR_AHUB2MEM                       2
  45 #define ADMA_CH_CTRL_DIR_MEM2AHUB                       4
  46 #define ADMA_CH_CTRL_MODE_CONTINUOUS                    (2 << 8)
  47 #define ADMA_CH_CTRL_FLOWCTRL_EN                        BIT(1)
  48
  49 #define ADMA_CH_CONFIG                                  0x28
  50 #define ADMA_CH_CONFIG_SRC_BUF(val)                     (((val) & 0x7) << 28)
  51 #define ADMA_CH_CONFIG_TRG_BUF(val)                     (((val) & 0x7) << 24)
  52 #define ADMA_CH_CONFIG_BURST_SIZE(val)                  (((val) & 0x7) << 20)
  53 #define ADMA_CH_CONFIG_BURST_16                         5
  54 #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val)              ((val) & 0xf)
  55 #define ADMA_CH_CONFIG_MAX_BUFS                         8
  56
  57 #define ADMA_CH_FIFO_CTRL                               0x2c
  58 #define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val)              (((val) & 0xf) << 24)
  59 #define ADMA_CH_FIFO_CTRL_STARV_THRES(val)              (((val) & 0xf) << 16)
  60 #define ADMA_CH_FIFO_CTRL_TX_SIZE(val)                  (((val) & 0xf) << 8)
  61 #define ADMA_CH_FIFO_CTRL_RX_SIZE(val)                  ((val) & 0xf)
  62
  63 #define ADMA_CH_LOWER_SRC_ADDR                          0x34
  64 #define ADMA_CH_LOWER_TRG_ADDR                          0x3c
  65 #define ADMA_CH_TC                                      0x44
  66 #define ADMA_CH_TC_COUNT_MASK                           0x3ffffffc
  67
  68 #define ADMA_CH_XFER_STATUS                             0x54
  69 #define ADMA_CH_XFER_STATUS_COUNT_MASK                  0xffff
  70
  71 #define ADMA_GLOBAL_CMD                                 0xc00
  72 #define ADMA_GLOBAL_SOFT_RESET                          0xc04
  73 #define ADMA_GLOBAL_INT_CLEAR                           0xc20
  74 #define ADMA_GLOBAL_CTRL                                0xc24
  75
  76 #define ADMA_CH_REG_OFFSET(a)                           (a * 0x80)
  77
  78 #define ADMA_CH_FIFO_CTRL_DEFAULT       (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \
  79                                          ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \
  80                                          ADMA_CH_FIFO_CTRL_TX_SIZE(3)     | \
  81                                          ADMA_CH_FIFO_CTRL_RX_SIZE(3))
  82 struct tegra_adma;
  83
  84 /*
  85  * struct tegra_adma_chip_data - Tegra chip specific data
  86  * @nr_channels: Number of DMA channels available.
  87  */
  88 struct tegra_adma_chip_data {
  89         int nr_channels;
  90 };
  91
  92 /*
  93  * struct tegra_adma_chan_regs - Tegra ADMA channel registers
  94  */
  95 struct tegra_adma_chan_regs {
  96         unsigned int ctrl;
  97         unsigned int config;
  98         unsigned int src_addr;
  99         unsigned int trg_addr;
 100         unsigned int fifo_ctrl;
 101         unsigned int cmd;
 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         struct tegra_adma_chan_regs     ch_regs;
 132
 133         /* Transfer count and position info */
 134         unsigned int                    tx_buf_count;
 135         unsigned int                    tx_buf_pos;
 136 };
 137
 138 /*
 139  * struct tegra_adma - Tegra ADMA controller information
 140  */
 141 struct tegra_adma {
 142         struct dma_device               dma_dev;
 143         struct device                   *dev;
 144         void __iomem                    *base_addr;
 145         struct clk                      *ahub_clk;
 146         unsigned int                    nr_channels;
 147         unsigned long                   rx_requests_reserved;
 148         unsigned long                   tx_requests_reserved;
 149
 150         /* Used to store global command register state when suspending */
 151         unsigned int                    global_cmd;
 152
 153         /* Last member of the structure */
 154         struct tegra_adma_chan          channels[0];
 155 };
 156
 157 static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
 158 {
 159         writel(val, tdma->base_addr + reg);
 160 }
 161
 162 static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
 163 {
 164         return readl(tdma->base_addr + reg);
 165 }
 166
 167 static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
 168 {
 169         writel(val, tdc->chan_addr + reg);
 170 }
 171
 172 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
 173 {
 174         return readl(tdc->chan_addr + reg);
 175 }
 176
 177 static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
 178 {
 179         return container_of(dc, struct tegra_adma_chan, vc.chan);
 180 }
 181
 182 static inline struct tegra_adma_desc *to_tegra_adma_desc(
 183                 struct dma_async_tx_descriptor *td)
 184 {
 185         return container_of(td, struct tegra_adma_desc, vd.tx);
 186 }
 187
 188 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
 189 {
 190         return tdc->tdma->dev;
 191 }
 192
 193 static void tegra_adma_desc_free(struct virt_dma_desc *vd)
 194 {
 195         kfree(container_of(vd, struct tegra_adma_desc, vd));
 196 }
 197
 198 static int tegra_adma_slave_config(struct dma_chan *dc,
 199                                    struct dma_slave_config *sconfig)
 200 {
 201         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 202
 203         memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
 204
 205         return 0;
 206 }
 207
 208 static int tegra_adma_init(struct tegra_adma *tdma)
 209 {
 210         u32 status;
 211         int ret;
 212
 213         /* Clear any interrupts */
 214         tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
 215
 216         /* Assert soft reset */
 217         tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
 218
 219         /* Wait for reset to clear */
 220         ret = readx_poll_timeout(readl,
 221                                  tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
 222                                  status, status == 0, 20, 10000);
 223         if (ret)
 224                 return ret;
 225
 226         /* Enable global ADMA registers */
 227         tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
 228
 229         return 0;
 230 }
 231
 232 static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
 233                                     enum dma_transfer_direction direction)
 234 {
 235         struct tegra_adma *tdma = tdc->tdma;
 236         unsigned int sreq_index = tdc->sreq_index;
 237
 238         if (tdc->sreq_reserved)
 239                 return tdc->sreq_dir == direction ? 0 : -EINVAL;
 240
 241         switch (direction) {
 242         case DMA_MEM_TO_DEV:
 243                 if (sreq_index > ADMA_CH_CTRL_TX_REQ_MAX) {
 244                         dev_err(tdma->dev, "invalid DMA request\n");
 245                         return -EINVAL;
 246                 }
 247
 248                 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
 249                         dev_err(tdma->dev, "DMA request reserved\n");
 250                         return -EINVAL;
 251                 }
 252                 break;
 253
 254         case DMA_DEV_TO_MEM:
 255                 if (sreq_index > ADMA_CH_CTRL_RX_REQ_MAX) {
 256                         dev_err(tdma->dev, "invalid DMA request\n");
 257                         return -EINVAL;
 258                 }
 259
 260                 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
 261                         dev_err(tdma->dev, "DMA request reserved\n");
 262                         return -EINVAL;
 263                 }
 264                 break;
 265
 266         default:
 267                 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
 268                          dma_chan_name(&tdc->vc.chan));
 269                 return -EINVAL;
 270         }
 271
 272         tdc->sreq_dir = direction;
 273         tdc->sreq_reserved = true;
 274
 275         return 0;
 276 }
 277
 278 static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
 279 {
 280         struct tegra_adma *tdma = tdc->tdma;
 281
 282         if (!tdc->sreq_reserved)
 283                 return;
 284
 285         switch (tdc->sreq_dir) {
 286         case DMA_MEM_TO_DEV:
 287                 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
 288                 break;
 289
 290         case DMA_DEV_TO_MEM:
 291                 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
 292                 break;
 293
 294         default:
 295                 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
 296                          dma_chan_name(&tdc->vc.chan));
 297                 return;
 298         }
 299
 300         tdc->sreq_reserved = false;
 301 }
 302
 303 static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
 304 {
 305         u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
 306
 307         return status & ADMA_CH_INT_STATUS_XFER_DONE;
 308 }
 309
 310 static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
 311 {
 312         u32 status = tegra_adma_irq_status(tdc);
 313
 314         if (status)
 315                 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
 316
 317         return status;
 318 }
 319
 320 static void tegra_adma_stop(struct tegra_adma_chan *tdc)
 321 {
 322         unsigned int status;
 323
 324         /* Disable ADMA */
 325         tdma_ch_write(tdc, ADMA_CH_CMD, 0);
 326
 327         /* Clear interrupt status */
 328         tegra_adma_irq_clear(tdc);
 329
 330         if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
 331                         status, !(status & ADMA_CH_STATUS_XFER_EN),
 332                         20, 10000)) {
 333                 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
 334                 return;
 335         }
 336
 337         kfree(tdc->desc);
 338         tdc->desc = NULL;
 339 }
 340
 341 static void tegra_adma_start(struct tegra_adma_chan *tdc)
 342 {
 343         struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
 344         struct tegra_adma_chan_regs *ch_regs;
 345         struct tegra_adma_desc *desc;
 346
 347         if (!vd)
 348                 return;
 349
 350         list_del(&vd->node);
 351
 352         desc = to_tegra_adma_desc(&vd->tx);
 353
 354         if (!desc) {
 355                 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
 356                 return;
 357         }
 358
 359         ch_regs = &desc->ch_regs;
 360
 361         tdc->tx_buf_pos = 0;
 362         tdc->tx_buf_count = 0;
 363         tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
 364         tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
 365         tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
 366         tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
 367         tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
 368         tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
 369
 370         /* Start ADMA */
 371         tdma_ch_write(tdc, ADMA_CH_CMD, 1);
 372
 373         tdc->desc = desc;
 374 }
 375
 376 static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
 377 {
 378         struct tegra_adma_desc *desc = tdc->desc;
 379         unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
 380         unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
 381         unsigned int periods_remaining;
 382
 383         /*
 384          * Handle wrap around of buffer count register
 385          */
 386         if (pos < tdc->tx_buf_pos)
 387                 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
 388         else
 389                 tdc->tx_buf_count += pos - tdc->tx_buf_pos;
 390
 391         periods_remaining = tdc->tx_buf_count % desc->num_periods;
 392         tdc->tx_buf_pos = pos;
 393
 394         return desc->buf_len - (periods_remaining * desc->period_len);
 395 }
 396
 397 static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
 398 {
 399         struct tegra_adma_chan *tdc = dev_id;
 400         unsigned long status;
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&tdc->vc.lock, flags);
 404
 405         status = tegra_adma_irq_clear(tdc);
 406         if (status == 0 || !tdc->desc) {
 407                 spin_unlock_irqrestore(&tdc->vc.lock, flags);
 408                 return IRQ_NONE;
 409         }
 410
 411         vchan_cyclic_callback(&tdc->desc->vd);
 412
 413         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 414
 415         return IRQ_HANDLED;
 416 }
 417
 418 static void tegra_adma_issue_pending(struct dma_chan *dc)
 419 {
 420         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&tdc->vc.lock, flags);
 424
 425         if (vchan_issue_pending(&tdc->vc)) {
 426                 if (!tdc->desc)
 427                         tegra_adma_start(tdc);
 428         }
 429
 430         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 431 }
 432
 433 static int tegra_adma_terminate_all(struct dma_chan *dc)
 434 {
 435         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 436         unsigned long flags;
 437         LIST_HEAD(head);
 438
 439         spin_lock_irqsave(&tdc->vc.lock, flags);
 440
 441         if (tdc->desc)
 442                 tegra_adma_stop(tdc);
 443
 444         tegra_adma_request_free(tdc);
 445         vchan_get_all_descriptors(&tdc->vc, &head);
 446         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 447         vchan_dma_desc_free_list(&tdc->vc, &head);
 448
 449         return 0;
 450 }
 451
 452 static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
 453                                             dma_cookie_t cookie,
 454                                             struct dma_tx_state *txstate)
 455 {
 456         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 457         struct tegra_adma_desc *desc;
 458         struct virt_dma_desc *vd;
 459         enum dma_status ret;
 460         unsigned long flags;
 461         unsigned int residual;
 462
 463         ret = dma_cookie_status(dc, cookie, txstate);
 464         if (ret == DMA_COMPLETE || !txstate)
 465                 return ret;
 466
 467         spin_lock_irqsave(&tdc->vc.lock, flags);
 468
 469         vd = vchan_find_desc(&tdc->vc, cookie);
 470         if (vd) {
 471                 desc = to_tegra_adma_desc(&vd->tx);
 472                 residual = desc->ch_regs.tc;
 473         } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
 474                 residual = tegra_adma_get_residue(tdc);
 475         } else {
 476                 residual = 0;
 477         }
 478
 479         spin_unlock_irqrestore(&tdc->vc.lock, flags);
 480
 481         dma_set_residue(txstate, residual);
 482
 483         return ret;
 484 }
 485
 486 static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
 487                                       struct tegra_adma_desc *desc,
 488                                       dma_addr_t buf_addr,
 489                                       enum dma_transfer_direction direction)
 490 {
 491         struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
 492         unsigned int burst_size, adma_dir;
 493
 494         if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
 495                 return -EINVAL;
 496
 497         switch (direction) {
 498         case DMA_MEM_TO_DEV:
 499                 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
 500                 burst_size = fls(tdc->sconfig.dst_maxburst);
 501                 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
 502                 ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->sreq_index);
 503                 ch_regs->src_addr = buf_addr;
 504                 break;
 505
 506         case DMA_DEV_TO_MEM:
 507                 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
 508                 burst_size = fls(tdc->sconfig.src_maxburst);
 509                 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
 510                 ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
 511                 ch_regs->trg_addr = buf_addr;
 512                 break;
 513
 514         default:
 515                 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
 516                 return -EINVAL;
 517         }
 518
 519         if (!burst_size || burst_size > ADMA_CH_CONFIG_BURST_16)
 520                 burst_size = ADMA_CH_CONFIG_BURST_16;
 521
 522         ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
 523                          ADMA_CH_CTRL_MODE_CONTINUOUS |
 524                          ADMA_CH_CTRL_FLOWCTRL_EN;
 525         ch_regs->config |= ADMA_CH_CONFIG_BURST_SIZE(burst_size);
 526         ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
 527         ch_regs->fifo_ctrl = ADMA_CH_FIFO_CTRL_DEFAULT;
 528         ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
 529
 530         return tegra_adma_request_alloc(tdc, direction);
 531 }
 532
 533 static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
 534         struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
 535         size_t period_len, enum dma_transfer_direction direction,
 536         unsigned long flags)
 537 {
 538         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 539         struct tegra_adma_desc *desc = NULL;
 540
 541         if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
 542                 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
 543                 return NULL;
 544         }
 545
 546         if (buf_len % period_len) {
 547                 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
 548                 return NULL;
 549         }
 550
 551         if (!IS_ALIGNED(buf_addr, 4)) {
 552                 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
 553                 return NULL;
 554         }
 555
 556         desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
 557         if (!desc)
 558                 return NULL;
 559
 560         desc->buf_len = buf_len;
 561         desc->period_len = period_len;
 562         desc->num_periods = buf_len / period_len;
 563
 564         if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
 565                 kfree(desc);
 566                 return NULL;
 567         }
 568
 569         return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
 570 }
 571
 572 static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
 573 {
 574         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 575         int ret;
 576
 577         ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
 578         if (ret) {
 579                 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
 580                         dma_chan_name(dc));
 581                 return ret;
 582         }
 583
 584         ret = pm_runtime_get_sync(tdc2dev(tdc));
 585         if (ret < 0) {
 586                 pm_runtime_put_noidle(tdc2dev(tdc));
 587                 free_irq(tdc->irq, tdc);
 588                 return ret;
 589         }
 590
 591         dma_cookie_init(&tdc->vc.chan);
 592
 593         return 0;
 594 }
 595
 596 static void tegra_adma_free_chan_resources(struct dma_chan *dc)
 597 {
 598         struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
 599
 600         tegra_adma_terminate_all(dc);
 601         vchan_free_chan_resources(&tdc->vc);
 602         tasklet_kill(&tdc->vc.task);
 603         free_irq(tdc->irq, tdc);
 604         pm_runtime_put(tdc2dev(tdc));
 605
 606         tdc->sreq_index = 0;
 607         tdc->sreq_dir = DMA_TRANS_NONE;
 608 }
 609
 610 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
 611                                            struct of_dma *ofdma)
 612 {
 613         struct tegra_adma *tdma = ofdma->of_dma_data;
 614         struct tegra_adma_chan *tdc;
 615         struct dma_chan *chan;
 616         unsigned int sreq_index;
 617
 618         if (dma_spec->args_count != 1)
 619                 return NULL;
 620
 621         sreq_index = dma_spec->args[0];
 622
 623         if (sreq_index == 0) {
 624                 dev_err(tdma->dev, "DMA request must not be 0\n");
 625                 return NULL;
 626         }
 627
 628         chan = dma_get_any_slave_channel(&tdma->dma_dev);
 629         if (!chan)
 630                 return NULL;
 631
 632         tdc = to_tegra_adma_chan(chan);
 633         tdc->sreq_index = sreq_index;
 634
 635         return chan;
 636 }
 637
 638 static int tegra_adma_runtime_suspend(struct device *dev)
 639 {
 640         struct tegra_adma *tdma = dev_get_drvdata(dev);
 641         struct tegra_adma_chan_regs *ch_reg;
 642         struct tegra_adma_chan *tdc;
 643         int i;
 644
 645         tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
 646         if (!tdma->global_cmd)
 647                 goto clk_disable;
 648
 649         for (i = 0; i < tdma->nr_channels; i++) {
 650                 tdc = &tdma->channels[i];
 651                 ch_reg = &tdc->ch_regs;
 652                 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
 653                 /* skip if channel is not active */
 654                 if (!ch_reg->cmd)
 655                         continue;
 656                 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
 657                 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
 658                 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
 659                 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
 660                 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
 661                 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
 662         }
 663
 664 clk_disable:
 665         clk_disable_unprepare(tdma->ahub_clk);
 666
 667         return 0;
 668 }
 669
 670 static int tegra_adma_runtime_resume(struct device *dev)
 671 {
 672         struct tegra_adma *tdma = dev_get_drvdata(dev);
 673         struct tegra_adma_chan_regs *ch_reg;
 674         struct tegra_adma_chan *tdc;
 675         int ret, i;
 676
 677         ret = clk_prepare_enable(tdma->ahub_clk);
 678         if (ret) {
 679                 dev_err(dev, "ahub clk_enable failed: %d\n", ret);
 680                 return ret;
 681         }
 682         tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
 683
 684         if (!tdma->global_cmd)
 685                 return 0;
 686
 687         for (i = 0; i < tdma->nr_channels; i++) {
 688                 tdc = &tdma->channels[i];
 689                 ch_reg = &tdc->ch_regs;
 690                 /* skip if channel was not active earlier */
 691                 if (!ch_reg->cmd)
 692                         continue;
 693                 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
 694                 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
 695                 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
 696                 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
 697                 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
 698                 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
 699                 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
 700         }
 701
 702         return 0;
 703 }
 704
 705 static const struct tegra_adma_chip_data tegra210_chip_data = {
 706         .nr_channels = 22,
 707 };
 708
 709 static const struct of_device_id tegra_adma_of_match[] = {
 710         { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
 711         { },
 712 };
 713 MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
 714
 715 static int tegra_adma_probe(struct platform_device *pdev)
 716 {
 717         const struct tegra_adma_chip_data *cdata;
 718         struct tegra_adma *tdma;
 719         struct resource *res;
 720         int ret, i;
 721
 722         cdata = of_device_get_match_data(&pdev->dev);
 723         if (!cdata) {
 724                 dev_err(&pdev->dev, "device match data not found\n");
 725                 return -ENODEV;
 726         }
 727
 728         tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
 729                             sizeof(struct tegra_adma_chan), GFP_KERNEL);
 730         if (!tdma)
 731                 return -ENOMEM;
 732
 733         tdma->dev = &pdev->dev;
 734         tdma->nr_channels = cdata->nr_channels;
 735         platform_set_drvdata(pdev, tdma);
 736
 737         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 738         tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
 739         if (IS_ERR(tdma->base_addr))
 740                 return PTR_ERR(tdma->base_addr);
 741
 742         tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
 743         if (IS_ERR(tdma->ahub_clk)) {
 744                 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
 745                 return PTR_ERR(tdma->ahub_clk);
 746         }
 747
 748         INIT_LIST_HEAD(&tdma->dma_dev.channels);
 749         for (i = 0; i < tdma->nr_channels; i++) {
 750                 struct tegra_adma_chan *tdc = &tdma->channels[i];
 751
 752                 tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
 753
 754                 tdc->irq = of_irq_get(pdev->dev.of_node, i);
 755                 if (tdc->irq < 0) {
 756                         ret = tdc->irq;
 757                         goto irq_dispose;
 758                 }
 759
 760                 vchan_init(&tdc->vc, &tdma->dma_dev);
 761                 tdc->vc.desc_free = tegra_adma_desc_free;
 762                 tdc->tdma = tdma;
 763         }
 764
 765         pm_runtime_enable(&pdev->dev);
 766
 767         ret = pm_runtime_get_sync(&pdev->dev);
 768         if (ret < 0) {
 769                 pm_runtime_put_noidle(&pdev->dev);
 770                 goto rpm_disable;
 771         }
 772
 773         ret = tegra_adma_init(tdma);
 774         if (ret)
 775                 goto rpm_put;
 776
 777         dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
 778         dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
 779         dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
 780
 781         tdma->dma_dev.dev = &pdev->dev;
 782         tdma->dma_dev.device_alloc_chan_resources =
 783                                         tegra_adma_alloc_chan_resources;
 784         tdma->dma_dev.device_free_chan_resources =
 785                                         tegra_adma_free_chan_resources;
 786         tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
 787         tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
 788         tdma->dma_dev.device_config = tegra_adma_slave_config;
 789         tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
 790         tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
 791         tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 792         tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
 793         tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 794         tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 795
 796         ret = dma_async_device_register(&tdma->dma_dev);
 797         if (ret < 0) {
 798                 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
 799                 goto rpm_put;
 800         }
 801
 802         ret = of_dma_controller_register(pdev->dev.of_node,
 803                                          tegra_dma_of_xlate, tdma);
 804         if (ret < 0) {
 805                 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
 806                 goto dma_remove;
 807         }
 808
 809         pm_runtime_put(&pdev->dev);
 810
 811         dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
 812                  tdma->nr_channels);
 813
 814         return 0;
 815
 816 dma_remove:
 817         dma_async_device_unregister(&tdma->dma_dev);
 818 rpm_put:
 819         pm_runtime_put_sync(&pdev->dev);
 820 rpm_disable:
 821         pm_runtime_disable(&pdev->dev);
 822 irq_dispose:
 823         while (--i >= 0)
 824                 irq_dispose_mapping(tdma->channels[i].irq);
 825
 826         return ret;
 827 }
 828
 829 static int tegra_adma_remove(struct platform_device *pdev)
 830 {
 831         struct tegra_adma *tdma = platform_get_drvdata(pdev);
 832         int i;
 833
 834         of_dma_controller_free(pdev->dev.of_node);
 835         dma_async_device_unregister(&tdma->dma_dev);
 836
 837         for (i = 0; i < tdma->nr_channels; ++i)
 838                 irq_dispose_mapping(tdma->channels[i].irq);
 839
 840         pm_runtime_put_sync(&pdev->dev);
 841         pm_runtime_disable(&pdev->dev);
 842
 843         return 0;
 844 }
 845
 846 #ifdef CONFIG_PM_SLEEP
 847 static int tegra_adma_pm_suspend(struct device *dev)
 848 {
 849         return pm_runtime_suspended(dev) == false;
 850 }
 851 #endif
 852
 853 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 854         SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 855                            tegra_adma_runtime_resume, NULL)
 856         SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
 857 };
 858
 859 static struct platform_driver tegra_admac_driver = {
 860         .driver = {
 861                 .name   = "tegra-adma",
 862                 .pm     = &tegra_adma_dev_pm_ops,
 863                 .of_match_table = tegra_adma_of_match,
 864         },
 865         .probe          = tegra_adma_probe,
 866         .remove         = tegra_adma_remove,
 867 };
 868
 869 module_platform_driver(tegra_admac_driver);
 870
 871 MODULE_ALIAS("platform:tegra210-adma");
 872 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
 873 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
 874 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
 875 MODULE_LICENSE("GPL v2");