drivers/dma/cppi41.c

   1 #include <linux/dmaengine.h>
   2 #include <linux/dma-mapping.h>
   3 #include <linux/platform_device.h>
   4 #include <linux/module.h>
   5 #include <linux/of.h>
   6 #include <linux/slab.h>
   7 #include <linux/of_dma.h>
   8 #include <linux/of_irq.h>
   9 #include <linux/dmapool.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/of_address.h>
  12 #include <linux/pm_runtime.h>
  13 #include "dmaengine.h"
  14
  15 #define DESC_TYPE       27
  16 #define DESC_TYPE_HOST  0x10
  17 #define DESC_TYPE_TEARD 0x13
  18
  19 #define TD_DESC_IS_RX   (1 << 16)
  20 #define TD_DESC_DMA_NUM 10
  21
  22 #define DESC_LENGTH_BITS_NUM    21
  23
  24 #define DESC_TYPE_USB   (5 << 26)
  25 #define DESC_PD_COMPLETE        (1 << 31)
  26
  27 /* DMA engine */
  28 #define DMA_TDFDQ       4
  29 #define DMA_TXGCR(x)    (0x800 + (x) * 0x20)
  30 #define DMA_RXGCR(x)    (0x808 + (x) * 0x20)
  31 #define RXHPCRA0                4
  32
  33 #define GCR_CHAN_ENABLE         (1 << 31)
  34 #define GCR_TEARDOWN            (1 << 30)
  35 #define GCR_STARV_RETRY         (1 << 24)
  36 #define GCR_DESC_TYPE_HOST      (1 << 14)
  37
  38 /* DMA scheduler */
  39 #define DMA_SCHED_CTRL          0
  40 #define DMA_SCHED_CTRL_EN       (1 << 31)
  41 #define DMA_SCHED_WORD(x)       ((x) * 4 + 0x800)
  42
  43 #define SCHED_ENTRY0_CHAN(x)    ((x) << 0)
  44 #define SCHED_ENTRY0_IS_RX      (1 << 7)
  45
  46 #define SCHED_ENTRY1_CHAN(x)    ((x) << 8)
  47 #define SCHED_ENTRY1_IS_RX      (1 << 15)
  48
  49 #define SCHED_ENTRY2_CHAN(x)    ((x) << 16)
  50 #define SCHED_ENTRY2_IS_RX      (1 << 23)
  51
  52 #define SCHED_ENTRY3_CHAN(x)    ((x) << 24)
  53 #define SCHED_ENTRY3_IS_RX      (1 << 31)
  54
  55 /* Queue manager */
  56 /* 4 KiB of memory for descriptors, 2 for each endpoint */
  57 #define ALLOC_DECS_NUM          128
  58 #define DESCS_AREAS             1
  59 #define TOTAL_DESCS_NUM         (ALLOC_DECS_NUM * DESCS_AREAS)
  60 #define QMGR_SCRATCH_SIZE       (TOTAL_DESCS_NUM * 4)
  61
  62 #define QMGR_LRAM0_BASE         0x80
  63 #define QMGR_LRAM_SIZE          0x84
  64 #define QMGR_LRAM1_BASE         0x88
  65 #define QMGR_MEMBASE(x)         (0x1000 + (x) * 0x10)
  66 #define QMGR_MEMCTRL(x)         (0x1004 + (x) * 0x10)
  67 #define QMGR_MEMCTRL_IDX_SH     16
  68 #define QMGR_MEMCTRL_DESC_SH    8
  69
  70 #define QMGR_NUM_PEND   5
  71 #define QMGR_PEND(x)    (0x90 + (x) * 4)
  72
  73 #define QMGR_PENDING_SLOT_Q(x)  (x / 32)
  74 #define QMGR_PENDING_BIT_Q(x)   (x % 32)
  75
  76 #define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10)
  77 #define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10)
  78 #define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10)
  79 #define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10)
  80
  81 /* Glue layer specific */
  82 /* USBSS  / USB AM335x */
  83 #define USBSS_IRQ_STATUS        0x28
  84 #define USBSS_IRQ_ENABLER       0x2c
  85 #define USBSS_IRQ_CLEARR        0x30
  86
  87 #define USBSS_IRQ_PD_COMP       (1 <<  2)
  88
  89 struct cppi41_channel {
  90         struct dma_chan chan;
  91         struct dma_async_tx_descriptor txd;
  92         struct cppi41_dd *cdd;
  93         struct cppi41_desc *desc;
  94         dma_addr_t desc_phys;
  95         void __iomem *gcr_reg;
  96         int is_tx;
  97         u32 residue;
  98
  99         unsigned int q_num;
 100         unsigned int q_comp_num;
 101         unsigned int port_num;
 102
 103         unsigned td_retry;
 104         unsigned td_queued:1;
 105         unsigned td_seen:1;
 106         unsigned td_desc_seen:1;
 107 };
 108
 109 struct cppi41_desc {
 110         u32 pd0;
 111         u32 pd1;
 112         u32 pd2;
 113         u32 pd3;
 114         u32 pd4;
 115         u32 pd5;
 116         u32 pd6;
 117         u32 pd7;
 118 } __aligned(32);
 119
 120 struct chan_queues {
 121         u16 submit;
 122         u16 complete;
 123 };
 124
 125 struct cppi41_dd {
 126         struct dma_device ddev;
 127
 128         void *qmgr_scratch;
 129         dma_addr_t scratch_phys;
 130
 131         struct cppi41_desc *cd;
 132         dma_addr_t descs_phys;
 133         u32 first_td_desc;
 134         struct cppi41_channel *chan_busy[ALLOC_DECS_NUM];
 135
 136         void __iomem *usbss_mem;
 137         void __iomem *ctrl_mem;
 138         void __iomem *sched_mem;
 139         void __iomem *qmgr_mem;
 140         unsigned int irq;
 141         const struct chan_queues *queues_rx;
 142         const struct chan_queues *queues_tx;
 143         struct chan_queues td_queue;
 144
 145         /* context for suspend/resume */
 146         unsigned int dma_tdfdq;
 147 };
 148
 149 #define FIST_COMPLETION_QUEUE   93
 150 static struct chan_queues usb_queues_tx[] = {
 151         /* USB0 ENDP 1 */
 152         [ 0] = { .submit = 32, .complete =  93},
 153         [ 1] = { .submit = 34, .complete =  94},
 154         [ 2] = { .submit = 36, .complete =  95},
 155         [ 3] = { .submit = 38, .complete =  96},
 156         [ 4] = { .submit = 40, .complete =  97},
 157         [ 5] = { .submit = 42, .complete =  98},
 158         [ 6] = { .submit = 44, .complete =  99},
 159         [ 7] = { .submit = 46, .complete = 100},
 160         [ 8] = { .submit = 48, .complete = 101},
 161         [ 9] = { .submit = 50, .complete = 102},
 162         [10] = { .submit = 52, .complete = 103},
 163         [11] = { .submit = 54, .complete = 104},
 164         [12] = { .submit = 56, .complete = 105},
 165         [13] = { .submit = 58, .complete = 106},
 166         [14] = { .submit = 60, .complete = 107},
 167
 168         /* USB1 ENDP1 */
 169         [15] = { .submit = 62, .complete = 125},
 170         [16] = { .submit = 64, .complete = 126},
 171         [17] = { .submit = 66, .complete = 127},
 172         [18] = { .submit = 68, .complete = 128},
 173         [19] = { .submit = 70, .complete = 129},
 174         [20] = { .submit = 72, .complete = 130},
 175         [21] = { .submit = 74, .complete = 131},
 176         [22] = { .submit = 76, .complete = 132},
 177         [23] = { .submit = 78, .complete = 133},
 178         [24] = { .submit = 80, .complete = 134},
 179         [25] = { .submit = 82, .complete = 135},
 180         [26] = { .submit = 84, .complete = 136},
 181         [27] = { .submit = 86, .complete = 137},
 182         [28] = { .submit = 88, .complete = 138},
 183         [29] = { .submit = 90, .complete = 139},
 184 };
 185
 186 static const struct chan_queues usb_queues_rx[] = {
 187         /* USB0 ENDP 1 */
 188         [ 0] = { .submit =  1, .complete = 109},
 189         [ 1] = { .submit =  2, .complete = 110},
 190         [ 2] = { .submit =  3, .complete = 111},
 191         [ 3] = { .submit =  4, .complete = 112},
 192         [ 4] = { .submit =  5, .complete = 113},
 193         [ 5] = { .submit =  6, .complete = 114},
 194         [ 6] = { .submit =  7, .complete = 115},
 195         [ 7] = { .submit =  8, .complete = 116},
 196         [ 8] = { .submit =  9, .complete = 117},
 197         [ 9] = { .submit = 10, .complete = 118},
 198         [10] = { .submit = 11, .complete = 119},
 199         [11] = { .submit = 12, .complete = 120},
 200         [12] = { .submit = 13, .complete = 121},
 201         [13] = { .submit = 14, .complete = 122},
 202         [14] = { .submit = 15, .complete = 123},
 203
 204         /* USB1 ENDP 1 */
 205         [15] = { .submit = 16, .complete = 141},
 206         [16] = { .submit = 17, .complete = 142},
 207         [17] = { .submit = 18, .complete = 143},
 208         [18] = { .submit = 19, .complete = 144},
 209         [19] = { .submit = 20, .complete = 145},
 210         [20] = { .submit = 21, .complete = 146},
 211         [21] = { .submit = 22, .complete = 147},
 212         [22] = { .submit = 23, .complete = 148},
 213         [23] = { .submit = 24, .complete = 149},
 214         [24] = { .submit = 25, .complete = 150},
 215         [25] = { .submit = 26, .complete = 151},
 216         [26] = { .submit = 27, .complete = 152},
 217         [27] = { .submit = 28, .complete = 153},
 218         [28] = { .submit = 29, .complete = 154},
 219         [29] = { .submit = 30, .complete = 155},
 220 };
 221
 222 struct cppi_glue_infos {
 223         irqreturn_t (*isr)(int irq, void *data);
 224         const struct chan_queues *queues_rx;
 225         const struct chan_queues *queues_tx;
 226         struct chan_queues td_queue;
 227 };
 228
 229 static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c)
 230 {
 231         return container_of(c, struct cppi41_channel, chan);
 232 }
 233
 234 static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc)
 235 {
 236         struct cppi41_channel *c;
 237         u32 descs_size;
 238         u32 desc_num;
 239
 240         descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM;
 241
 242         if (!((desc >= cdd->descs_phys) &&
 243                         (desc < (cdd->descs_phys + descs_size)))) {
 244                 return NULL;
 245         }
 246
 247         desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc);
 248         BUG_ON(desc_num >= ALLOC_DECS_NUM);
 249         c = cdd->chan_busy[desc_num];
 250         cdd->chan_busy[desc_num] = NULL;
 251         return c;
 252 }
 253
 254 static void cppi_writel(u32 val, void *__iomem *mem)
 255 {
 256         __raw_writel(val, mem);
 257 }
 258
 259 static u32 cppi_readl(void *__iomem *mem)
 260 {
 261         return __raw_readl(mem);
 262 }
 263
 264 static u32 pd_trans_len(u32 val)
 265 {
 266         return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1);
 267 }
 268
 269 static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num)
 270 {
 271         u32 desc;
 272
 273         desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num));
 274         desc &= ~0x1f;
 275         return desc;
 276 }
 277
 278 static irqreturn_t cppi41_irq(int irq, void *data)
 279 {
 280         struct cppi41_dd *cdd = data;
 281         struct cppi41_channel *c;
 282         u32 status;
 283         int i;
 284
 285         status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
 286         if (!(status & USBSS_IRQ_PD_COMP))
 287                 return IRQ_NONE;
 288         cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
 289
 290         for (i = QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE); i < QMGR_NUM_PEND;
 291                         i++) {
 292                 u32 val;
 293                 u32 q_num;
 294
 295                 val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i));
 296                 if (i == QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE) && val) {
 297                         u32 mask;
 298                         /* set corresponding bit for completetion Q 93 */
 299                         mask = 1 << QMGR_PENDING_BIT_Q(FIST_COMPLETION_QUEUE);
 300                         /* not set all bits for queues less than Q 93 */
 301                         mask--;
 302                         /* now invert and keep only Q 93+ set */
 303                         val &= ~mask;
 304                 }
 305
 306                 if (val)
 307                         __iormb();
 308
 309                 while (val) {
 310                         u32 desc;
 311
 312                         q_num = __fls(val);
 313                         val &= ~(1 << q_num);
 314                         q_num += 32 * i;
 315                         desc = cppi41_pop_desc(cdd, q_num);
 316                         c = desc_to_chan(cdd, desc);
 317                         if (WARN_ON(!c)) {
 318                                 pr_err("%s() q %d desc %08x\n", __func__,
 319                                                 q_num, desc);
 320                                 continue;
 321                         }
 322                         c->residue = pd_trans_len(c->desc->pd6) -
 323                                 pd_trans_len(c->desc->pd0);
 324
 325                         dma_cookie_complete(&c->txd);
 326                         c->txd.callback(c->txd.callback_param);
 327                 }
 328         }
 329         return IRQ_HANDLED;
 330 }
 331
 332 static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
 333 {
 334         dma_cookie_t cookie;
 335
 336         cookie = dma_cookie_assign(tx);
 337
 338         return cookie;
 339 }
 340
 341 static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan)
 342 {
 343         struct cppi41_channel *c = to_cpp41_chan(chan);
 344
 345         dma_cookie_init(chan);
 346         dma_async_tx_descriptor_init(&c->txd, chan);
 347         c->txd.tx_submit = cppi41_tx_submit;
 348
 349         if (!c->is_tx)
 350                 cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
 351
 352         return 0;
 353 }
 354
 355 static void cppi41_dma_free_chan_resources(struct dma_chan *chan)
 356 {
 357 }
 358
 359 static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan,
 360         dma_cookie_t cookie, struct dma_tx_state *txstate)
 361 {
 362         struct cppi41_channel *c = to_cpp41_chan(chan);
 363         enum dma_status ret;
 364
 365         /* lock */
 366         ret = dma_cookie_status(chan, cookie, txstate);
 367         if (txstate && ret == DMA_COMPLETE)
 368                 txstate->residue = c->residue;
 369         /* unlock */
 370
 371         return ret;
 372 }
 373
 374 static void push_desc_queue(struct cppi41_channel *c)
 375 {
 376         struct cppi41_dd *cdd = c->cdd;
 377         u32 desc_num;
 378         u32 desc_phys;
 379         u32 reg;
 380
 381         desc_phys = lower_32_bits(c->desc_phys);
 382         desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
 383         WARN_ON(cdd->chan_busy[desc_num]);
 384         cdd->chan_busy[desc_num] = c;
 385
 386         reg = (sizeof(struct cppi41_desc) - 24) / 4;
 387         reg |= desc_phys;
 388         cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
 389 }
 390
 391 static void cppi41_dma_issue_pending(struct dma_chan *chan)
 392 {
 393         struct cppi41_channel *c = to_cpp41_chan(chan);
 394         u32 reg;
 395
 396         c->residue = 0;
 397
 398         reg = GCR_CHAN_ENABLE;
 399         if (!c->is_tx) {
 400                 reg |= GCR_STARV_RETRY;
 401                 reg |= GCR_DESC_TYPE_HOST;
 402                 reg |= c->q_comp_num;
 403         }
 404
 405         cppi_writel(reg, c->gcr_reg);
 406
 407         /*
 408          * We don't use writel() but __raw_writel() so we have to make sure
 409          * that the DMA descriptor in coherent memory made to the main memory
 410          * before starting the dma engine.
 411          */
 412         __iowmb();
 413         push_desc_queue(c);
 414 }
 415
 416 static u32 get_host_pd0(u32 length)
 417 {
 418         u32 reg;
 419
 420         reg = DESC_TYPE_HOST << DESC_TYPE;
 421         reg |= length;
 422
 423         return reg;
 424 }
 425
 426 static u32 get_host_pd1(struct cppi41_channel *c)
 427 {
 428         u32 reg;
 429
 430         reg = 0;
 431
 432         return reg;
 433 }
 434
 435 static u32 get_host_pd2(struct cppi41_channel *c)
 436 {
 437         u32 reg;
 438
 439         reg = DESC_TYPE_USB;
 440         reg |= c->q_comp_num;
 441
 442         return reg;
 443 }
 444
 445 static u32 get_host_pd3(u32 length)
 446 {
 447         u32 reg;
 448
 449         /* PD3 = packet size */
 450         reg = length;
 451
 452         return reg;
 453 }
 454
 455 static u32 get_host_pd6(u32 length)
 456 {
 457         u32 reg;
 458
 459         /* PD6 buffer size */
 460         reg = DESC_PD_COMPLETE;
 461         reg |= length;
 462
 463         return reg;
 464 }
 465
 466 static u32 get_host_pd4_or_7(u32 addr)
 467 {
 468         u32 reg;
 469
 470         reg = addr;
 471
 472         return reg;
 473 }
 474
 475 static u32 get_host_pd5(void)
 476 {
 477         u32 reg;
 478
 479         reg = 0;
 480
 481         return reg;
 482 }
 483
 484 static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
 485         struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len,
 486         enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
 487 {
 488         struct cppi41_channel *c = to_cpp41_chan(chan);
 489         struct cppi41_desc *d;
 490         struct scatterlist *sg;
 491         unsigned int i;
 492         unsigned int num;
 493
 494         num = 0;
 495         d = c->desc;
 496         for_each_sg(sgl, sg, sg_len, i) {
 497                 u32 addr;
 498                 u32 len;
 499
 500                 /* We need to use more than one desc once musb supports sg */
 501                 BUG_ON(num > 0);
 502                 addr = lower_32_bits(sg_dma_address(sg));
 503                 len = sg_dma_len(sg);
 504
 505                 d->pd0 = get_host_pd0(len);
 506                 d->pd1 = get_host_pd1(c);
 507                 d->pd2 = get_host_pd2(c);
 508                 d->pd3 = get_host_pd3(len);
 509                 d->pd4 = get_host_pd4_or_7(addr);
 510                 d->pd5 = get_host_pd5();
 511                 d->pd6 = get_host_pd6(len);
 512                 d->pd7 = get_host_pd4_or_7(addr);
 513
 514                 d++;
 515         }
 516
 517         return &c->txd;
 518 }
 519
 520 static int cpp41_cfg_chan(struct cppi41_channel *c,
 521                 struct dma_slave_config *cfg)
 522 {
 523         return 0;
 524 }
 525
 526 static void cppi41_compute_td_desc(struct cppi41_desc *d)
 527 {
 528         d->pd0 = DESC_TYPE_TEARD << DESC_TYPE;
 529 }
 530
 531 static int cppi41_tear_down_chan(struct cppi41_channel *c)
 532 {
 533         struct cppi41_dd *cdd = c->cdd;
 534         struct cppi41_desc *td;
 535         u32 reg;
 536         u32 desc_phys;
 537         u32 td_desc_phys;
 538
 539         td = cdd->cd;
 540         td += cdd->first_td_desc;
 541
 542         td_desc_phys = cdd->descs_phys;
 543         td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc);
 544
 545         if (!c->td_queued) {
 546                 cppi41_compute_td_desc(td);
 547                 __iowmb();
 548
 549                 reg = (sizeof(struct cppi41_desc) - 24) / 4;
 550                 reg |= td_desc_phys;
 551                 cppi_writel(reg, cdd->qmgr_mem +
 552                                 QMGR_QUEUE_D(cdd->td_queue.submit));
 553
 554                 reg = GCR_CHAN_ENABLE;
 555                 if (!c->is_tx) {
 556                         reg |= GCR_STARV_RETRY;
 557                         reg |= GCR_DESC_TYPE_HOST;
 558                         reg |= c->q_comp_num;
 559                 }
 560                 reg |= GCR_TEARDOWN;
 561                 cppi_writel(reg, c->gcr_reg);
 562                 c->td_queued = 1;
 563                 c->td_retry = 100;
 564         }
 565
 566         if (!c->td_seen || !c->td_desc_seen) {
 567
 568                 desc_phys = cppi41_pop_desc(cdd, cdd->td_queue.complete);
 569                 if (!desc_phys)
 570                         desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
 571
 572                 if (desc_phys == c->desc_phys) {
 573                         c->td_desc_seen = 1;
 574
 575                 } else if (desc_phys == td_desc_phys) {
 576                         u32 pd0;
 577
 578                         __iormb();
 579                         pd0 = td->pd0;
 580                         WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD);
 581                         WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX));
 582                         WARN_ON((pd0 & 0x1f) != c->port_num);
 583                         c->td_seen = 1;
 584                 } else if (desc_phys) {
 585                         WARN_ON_ONCE(1);
 586                 }
 587         }
 588         c->td_retry--;
 589         /*
 590          * If the TX descriptor / channel is in use, the caller needs to poke
 591          * his TD bit multiple times. After that he hardware releases the
 592          * transfer descriptor followed by TD descriptor. Waiting seems not to
 593          * cause any difference.
 594          * RX seems to be thrown out right away. However once the TearDown
 595          * descriptor gets through we are done. If we have seens the transfer
 596          * descriptor before the TD we fetch it from enqueue, it has to be
 597          * there waiting for us.
 598          */
 599         if (!c->td_seen && c->td_retry)
 600                 return -EAGAIN;
 601
 602         WARN_ON(!c->td_retry);
 603         if (!c->td_desc_seen) {
 604                 desc_phys = cppi41_pop_desc(cdd, c->q_num);
 605                 WARN_ON(!desc_phys);
 606         }
 607
 608         c->td_queued = 0;
 609         c->td_seen = 0;
 610         c->td_desc_seen = 0;
 611         cppi_writel(0, c->gcr_reg);
 612         return 0;
 613 }
 614
 615 static int cppi41_stop_chan(struct dma_chan *chan)
 616 {
 617         struct cppi41_channel *c = to_cpp41_chan(chan);
 618         struct cppi41_dd *cdd = c->cdd;
 619         u32 desc_num;
 620         u32 desc_phys;
 621         int ret;
 622
 623         ret = cppi41_tear_down_chan(c);
 624         if (ret)
 625                 return ret;
 626
 627         desc_phys = lower_32_bits(c->desc_phys);
 628         desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
 629         WARN_ON(!cdd->chan_busy[desc_num]);
 630         cdd->chan_busy[desc_num] = NULL;
 631
 632         return 0;
 633 }
 634
 635 static int cppi41_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 636         unsigned long arg)
 637 {
 638         struct cppi41_channel *c = to_cpp41_chan(chan);
 639         int ret;
 640
 641         switch (cmd) {
 642         case DMA_SLAVE_CONFIG:
 643                 ret = cpp41_cfg_chan(c, (struct dma_slave_config *) arg);
 644                 break;
 645
 646         case DMA_TERMINATE_ALL:
 647                 ret = cppi41_stop_chan(chan);
 648                 break;
 649
 650         default:
 651                 ret = -ENXIO;
 652                 break;
 653         }
 654         return ret;
 655 }
 656
 657 static void cleanup_chans(struct cppi41_dd *cdd)
 658 {
 659         while (!list_empty(&cdd->ddev.channels)) {
 660                 struct cppi41_channel *cchan;
 661
 662                 cchan = list_first_entry(&cdd->ddev.channels,
 663                                 struct cppi41_channel, chan.device_node);
 664                 list_del(&cchan->chan.device_node);
 665                 kfree(cchan);
 666         }
 667 }
 668
 669 static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd)
 670 {
 671         struct cppi41_channel *cchan;
 672         int i;
 673         int ret;
 674         u32 n_chans;
 675
 676         ret = of_property_read_u32(dev->of_node, "#dma-channels",
 677                         &n_chans);
 678         if (ret)
 679                 return ret;
 680         /*
 681          * The channels can only be used as TX or as RX. So we add twice
 682          * that much dma channels because USB can only do RX or TX.
 683          */
 684         n_chans *= 2;
 685
 686         for (i = 0; i < n_chans; i++) {
 687                 cchan = kzalloc(sizeof(*cchan), GFP_KERNEL);
 688                 if (!cchan)
 689                         goto err;
 690
 691                 cchan->cdd = cdd;
 692                 if (i & 1) {
 693                         cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1);
 694                         cchan->is_tx = 1;
 695                 } else {
 696                         cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1);
 697                         cchan->is_tx = 0;
 698                 }
 699                 cchan->port_num = i >> 1;
 700                 cchan->desc = &cdd->cd[i];
 701                 cchan->desc_phys = cdd->descs_phys;
 702                 cchan->desc_phys += i * sizeof(struct cppi41_desc);
 703                 cchan->chan.device = &cdd->ddev;
 704                 list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels);
 705         }
 706         cdd->first_td_desc = n_chans;
 707
 708         return 0;
 709 err:
 710         cleanup_chans(cdd);
 711         return -ENOMEM;
 712 }
 713
 714 static void purge_descs(struct device *dev, struct cppi41_dd *cdd)
 715 {
 716         unsigned int mem_decs;
 717         int i;
 718
 719         mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc);
 720
 721         for (i = 0; i < DESCS_AREAS; i++) {
 722
 723                 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i));
 724                 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i));
 725
 726                 dma_free_coherent(dev, mem_decs, cdd->cd,
 727                                 cdd->descs_phys);
 728         }
 729 }
 730
 731 static void disable_sched(struct cppi41_dd *cdd)
 732 {
 733         cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
 734 }
 735
 736 static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd)
 737 {
 738         disable_sched(cdd);
 739
 740         purge_descs(dev, cdd);
 741
 742         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 743         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 744         dma_free_coherent(dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch,
 745                         cdd->scratch_phys);
 746 }
 747
 748 static int init_descs(struct device *dev, struct cppi41_dd *cdd)
 749 {
 750         unsigned int desc_size;
 751         unsigned int mem_decs;
 752         int i;
 753         u32 reg;
 754         u32 idx;
 755
 756         BUILD_BUG_ON(sizeof(struct cppi41_desc) &
 757                         (sizeof(struct cppi41_desc) - 1));
 758         BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32);
 759         BUILD_BUG_ON(ALLOC_DECS_NUM < 32);
 760
 761         desc_size = sizeof(struct cppi41_desc);
 762         mem_decs = ALLOC_DECS_NUM * desc_size;
 763
 764         idx = 0;
 765         for (i = 0; i < DESCS_AREAS; i++) {
 766
 767                 reg = idx << QMGR_MEMCTRL_IDX_SH;
 768                 reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH;
 769                 reg |= ilog2(ALLOC_DECS_NUM) - 5;
 770
 771                 BUILD_BUG_ON(DESCS_AREAS != 1);
 772                 cdd->cd = dma_alloc_coherent(dev, mem_decs,
 773                                 &cdd->descs_phys, GFP_KERNEL);
 774                 if (!cdd->cd)
 775                         return -ENOMEM;
 776
 777                 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
 778                 cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
 779
 780                 idx += ALLOC_DECS_NUM;
 781         }
 782         return 0;
 783 }
 784
 785 static void init_sched(struct cppi41_dd *cdd)
 786 {
 787         unsigned ch;
 788         unsigned word;
 789         u32 reg;
 790
 791         word = 0;
 792         cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
 793         for (ch = 0; ch < 15 * 2; ch += 2) {
 794
 795                 reg = SCHED_ENTRY0_CHAN(ch);
 796                 reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
 797
 798                 reg |= SCHED_ENTRY2_CHAN(ch + 1);
 799                 reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX;
 800                 cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word));
 801                 word++;
 802         }
 803         reg = 15 * 2 * 2 - 1;
 804         reg |= DMA_SCHED_CTRL_EN;
 805         cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);
 806 }
 807
 808 static int init_cppi41(struct device *dev, struct cppi41_dd *cdd)
 809 {
 810         int ret;
 811
 812         BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1));
 813         cdd->qmgr_scratch = dma_alloc_coherent(dev, QMGR_SCRATCH_SIZE,
 814                         &cdd->scratch_phys, GFP_KERNEL);
 815         if (!cdd->qmgr_scratch)
 816                 return -ENOMEM;
 817
 818         cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 819         cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
 820         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
 821
 822         ret = init_descs(dev, cdd);
 823         if (ret)
 824                 goto err_td;
 825
 826         cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
 827         init_sched(cdd);
 828         return 0;
 829 err_td:
 830         deinit_cppi41(dev, cdd);
 831         return ret;
 832 }
 833
 834 static struct platform_driver cpp41_dma_driver;
 835 /*
 836  * The param format is:
 837  * X Y
 838  * X: Port
 839  * Y: 0 = RX else TX
 840  */
 841 #define INFO_PORT       0
 842 #define INFO_IS_TX      1
 843
 844 static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param)
 845 {
 846         struct cppi41_channel *cchan;
 847         struct cppi41_dd *cdd;
 848         const struct chan_queues *queues;
 849         u32 *num = param;
 850
 851         if (chan->device->dev->driver != &cpp41_dma_driver.driver)
 852                 return false;
 853
 854         cchan = to_cpp41_chan(chan);
 855
 856         if (cchan->port_num != num[INFO_PORT])
 857                 return false;
 858
 859         if (cchan->is_tx && !num[INFO_IS_TX])
 860                 return false;
 861         cdd = cchan->cdd;
 862         if (cchan->is_tx)
 863                 queues = cdd->queues_tx;
 864         else
 865                 queues = cdd->queues_rx;
 866
 867         BUILD_BUG_ON(ARRAY_SIZE(usb_queues_rx) != ARRAY_SIZE(usb_queues_tx));
 868         if (WARN_ON(cchan->port_num > ARRAY_SIZE(usb_queues_rx)))
 869                 return false;
 870
 871         cchan->q_num = queues[cchan->port_num].submit;
 872         cchan->q_comp_num = queues[cchan->port_num].complete;
 873         return true;
 874 }
 875
 876 static struct of_dma_filter_info cpp41_dma_info = {
 877         .filter_fn = cpp41_dma_filter_fn,
 878 };
 879
 880 static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec,
 881                 struct of_dma *ofdma)
 882 {
 883         int count = dma_spec->args_count;
 884         struct of_dma_filter_info *info = ofdma->of_dma_data;
 885
 886         if (!info || !info->filter_fn)
 887                 return NULL;
 888
 889         if (count != 2)
 890                 return NULL;
 891
 892         return dma_request_channel(info->dma_cap, info->filter_fn,
 893                         &dma_spec->args[0]);
 894 }
 895
 896 static const struct cppi_glue_infos usb_infos = {
 897         .isr = cppi41_irq,
 898         .queues_rx = usb_queues_rx,
 899         .queues_tx = usb_queues_tx,
 900         .td_queue = { .submit = 31, .complete = 0 },
 901 };
 902
 903 static const struct of_device_id cppi41_dma_ids[] = {
 904         { .compatible = "ti,am3359-cppi41", .data = &usb_infos},
 905         {},
 906 };
 907 MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
 908
 909 static const struct cppi_glue_infos *get_glue_info(struct device *dev)
 910 {
 911         const struct of_device_id *of_id;
 912
 913         of_id = of_match_node(cppi41_dma_ids, dev->of_node);
 914         if (!of_id)
 915                 return NULL;
 916         return of_id->data;
 917 }
 918
 919 static int cppi41_dma_probe(struct platform_device *pdev)
 920 {
 921         struct cppi41_dd *cdd;
 922         struct device *dev = &pdev->dev;
 923         const struct cppi_glue_infos *glue_info;
 924         int irq;
 925         int ret;
 926
 927         glue_info = get_glue_info(dev);
 928         if (!glue_info)
 929                 return -EINVAL;
 930
 931         cdd = kzalloc(sizeof(*cdd), GFP_KERNEL);
 932         if (!cdd)
 933                 return -ENOMEM;
 934
 935         dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask);
 936         cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources;
 937         cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources;
 938         cdd->ddev.device_tx_status = cppi41_dma_tx_status;
 939         cdd->ddev.device_issue_pending = cppi41_dma_issue_pending;
 940         cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg;
 941         cdd->ddev.device_control = cppi41_dma_control;
 942         cdd->ddev.dev = dev;
 943         INIT_LIST_HEAD(&cdd->ddev.channels);
 944         cpp41_dma_info.dma_cap = cdd->ddev.cap_mask;
 945
 946         cdd->usbss_mem = of_iomap(dev->of_node, 0);
 947         cdd->ctrl_mem = of_iomap(dev->of_node, 1);
 948         cdd->sched_mem = of_iomap(dev->of_node, 2);
 949         cdd->qmgr_mem = of_iomap(dev->of_node, 3);
 950
 951         if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
 952                         !cdd->qmgr_mem) {
 953                 ret = -ENXIO;
 954                 goto err_remap;
 955         }
 956
 957         pm_runtime_enable(dev);
 958         ret = pm_runtime_get_sync(dev);
 959         if (ret < 0)
 960                 goto err_get_sync;
 961
 962         cdd->queues_rx = glue_info->queues_rx;
 963         cdd->queues_tx = glue_info->queues_tx;
 964         cdd->td_queue = glue_info->td_queue;
 965
 966         ret = init_cppi41(dev, cdd);
 967         if (ret)
 968                 goto err_init_cppi;
 969
 970         ret = cppi41_add_chans(dev, cdd);
 971         if (ret)
 972                 goto err_chans;
 973
 974         irq = irq_of_parse_and_map(dev->of_node, 0);
 975         if (!irq)
 976                 goto err_irq;
 977
 978         cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
 979
 980         ret = request_irq(irq, glue_info->isr, IRQF_SHARED,
 981                         dev_name(dev), cdd);
 982         if (ret)
 983                 goto err_irq;
 984         cdd->irq = irq;
 985
 986         ret = dma_async_device_register(&cdd->ddev);
 987         if (ret)
 988                 goto err_dma_reg;
 989
 990         ret = of_dma_controller_register(dev->of_node,
 991                         cppi41_dma_xlate, &cpp41_dma_info);
 992         if (ret)
 993                 goto err_of;
 994
 995         platform_set_drvdata(pdev, cdd);
 996         return 0;
 997 err_of:
 998         dma_async_device_unregister(&cdd->ddev);
 999 err_dma_reg:
1000         free_irq(irq, cdd);
1001 err_irq:
1002         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1003         cleanup_chans(cdd);
1004 err_chans:
1005         deinit_cppi41(dev, cdd);
1006 err_init_cppi:
1007         pm_runtime_put(dev);
1008 err_get_sync:
1009         pm_runtime_disable(dev);
1010         iounmap(cdd->usbss_mem);
1011         iounmap(cdd->ctrl_mem);
1012         iounmap(cdd->sched_mem);
1013         iounmap(cdd->qmgr_mem);
1014 err_remap:
1015         kfree(cdd);
1016         return ret;
1017 }
1018
1019 static int cppi41_dma_remove(struct platform_device *pdev)
1020 {
1021         struct cppi41_dd *cdd = platform_get_drvdata(pdev);
1022
1023         of_dma_controller_free(pdev->dev.of_node);
1024         dma_async_device_unregister(&cdd->ddev);
1025
1026         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1027         free_irq(cdd->irq, cdd);
1028         cleanup_chans(cdd);
1029         deinit_cppi41(&pdev->dev, cdd);
1030         iounmap(cdd->usbss_mem);
1031         iounmap(cdd->ctrl_mem);
1032         iounmap(cdd->sched_mem);
1033         iounmap(cdd->qmgr_mem);
1034         pm_runtime_put(&pdev->dev);
1035         pm_runtime_disable(&pdev->dev);
1036         kfree(cdd);
1037         return 0;
1038 }
1039
1040 #ifdef CONFIG_PM_SLEEP
1041 static int cppi41_suspend(struct device *dev)
1042 {
1043         struct cppi41_dd *cdd = dev_get_drvdata(dev);
1044
1045         cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ);
1046         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1047         disable_sched(cdd);
1048
1049         return 0;
1050 }
1051
1052 static int cppi41_resume(struct device *dev)
1053 {
1054         struct cppi41_dd *cdd = dev_get_drvdata(dev);
1055         struct cppi41_channel *c;
1056         int i;
1057
1058         for (i = 0; i < DESCS_AREAS; i++)
1059                 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
1060
1061         list_for_each_entry(c, &cdd->ddev.channels, chan.device_node)
1062                 if (!c->is_tx)
1063                         cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
1064
1065         init_sched(cdd);
1066
1067         cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ);
1068         cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
1069         cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
1070         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
1071
1072         cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
1073
1074         return 0;
1075 }
1076 #endif
1077
1078 static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);
1079
1080 static struct platform_driver cpp41_dma_driver = {
1081         .probe  = cppi41_dma_probe,
1082         .remove = cppi41_dma_remove,
1083         .driver = {
1084                 .name = "cppi41-dma-engine",
1085                 .owner = THIS_MODULE,
1086                 .pm = &cppi41_pm_ops,
1087                 .of_match_table = of_match_ptr(cppi41_dma_ids),
1088         },
1089 };
1090
1091 module_platform_driver(cpp41_dma_driver);
1092 MODULE_LICENSE("GPL");
1093 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");