drivers/dma/cppi41.c

   1 #include <linux/delay.h>
   2 #include <linux/dmaengine.h>
   3 #include <linux/dma-mapping.h>
   4 #include <linux/platform_device.h>
   5 #include <linux/module.h>
   6 #include <linux/of.h>
   7 #include <linux/slab.h>
   8 #include <linux/of_dma.h>
   9 #include <linux/of_irq.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/of_address.h>
  13 #include <linux/pm_runtime.h>
  14 #include "dmaengine.h"
  15
  16 #define DESC_TYPE       27
  17 #define DESC_TYPE_HOST  0x10
  18 #define DESC_TYPE_TEARD 0x13
  19
  20 #define TD_DESC_IS_RX   (1 << 16)
  21 #define TD_DESC_DMA_NUM 10
  22
  23 #define DESC_LENGTH_BITS_NUM    21
  24
  25 #define DESC_TYPE_USB   (5 << 26)
  26 #define DESC_PD_COMPLETE        (1 << 31)
  27
  28 /* DMA engine */
  29 #define DMA_TDFDQ       4
  30 #define DMA_TXGCR(x)    (0x800 + (x) * 0x20)
  31 #define DMA_RXGCR(x)    (0x808 + (x) * 0x20)
  32 #define RXHPCRA0                4
  33
  34 #define GCR_CHAN_ENABLE         (1 << 31)
  35 #define GCR_TEARDOWN            (1 << 30)
  36 #define GCR_STARV_RETRY         (1 << 24)
  37 #define GCR_DESC_TYPE_HOST      (1 << 14)
  38
  39 /* DMA scheduler */
  40 #define DMA_SCHED_CTRL          0
  41 #define DMA_SCHED_CTRL_EN       (1 << 31)
  42 #define DMA_SCHED_WORD(x)       ((x) * 4 + 0x800)
  43
  44 #define SCHED_ENTRY0_CHAN(x)    ((x) << 0)
  45 #define SCHED_ENTRY0_IS_RX      (1 << 7)
  46
  47 #define SCHED_ENTRY1_CHAN(x)    ((x) << 8)
  48 #define SCHED_ENTRY1_IS_RX      (1 << 15)
  49
  50 #define SCHED_ENTRY2_CHAN(x)    ((x) << 16)
  51 #define SCHED_ENTRY2_IS_RX      (1 << 23)
  52
  53 #define SCHED_ENTRY3_CHAN(x)    ((x) << 24)
  54 #define SCHED_ENTRY3_IS_RX      (1 << 31)
  55
  56 /* Queue manager */
  57 /* 4 KiB of memory for descriptors, 2 for each endpoint */
  58 #define ALLOC_DECS_NUM          128
  59 #define DESCS_AREAS             1
  60 #define TOTAL_DESCS_NUM         (ALLOC_DECS_NUM * DESCS_AREAS)
  61 #define QMGR_SCRATCH_SIZE       (TOTAL_DESCS_NUM * 4)
  62
  63 #define QMGR_LRAM0_BASE         0x80
  64 #define QMGR_LRAM_SIZE          0x84
  65 #define QMGR_LRAM1_BASE         0x88
  66 #define QMGR_MEMBASE(x)         (0x1000 + (x) * 0x10)
  67 #define QMGR_MEMCTRL(x)         (0x1004 + (x) * 0x10)
  68 #define QMGR_MEMCTRL_IDX_SH     16
  69 #define QMGR_MEMCTRL_DESC_SH    8
  70
  71 #define QMGR_NUM_PEND   5
  72 #define QMGR_PEND(x)    (0x90 + (x) * 4)
  73
  74 #define QMGR_PENDING_SLOT_Q(x)  (x / 32)
  75 #define QMGR_PENDING_BIT_Q(x)   (x % 32)
  76
  77 #define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10)
  78 #define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10)
  79 #define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10)
  80 #define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10)
  81
  82 /* Glue layer specific */
  83 /* USBSS  / USB AM335x */
  84 #define USBSS_IRQ_STATUS        0x28
  85 #define USBSS_IRQ_ENABLER       0x2c
  86 #define USBSS_IRQ_CLEARR        0x30
  87
  88 #define USBSS_IRQ_PD_COMP       (1 <<  2)
  89
  90 /* Packet Descriptor */
  91 #define PD2_ZERO_LENGTH         (1 << 19)
  92
  93 struct cppi41_channel {
  94         struct dma_chan chan;
  95         struct dma_async_tx_descriptor txd;
  96         struct cppi41_dd *cdd;
  97         struct cppi41_desc *desc;
  98         dma_addr_t desc_phys;
  99         void __iomem *gcr_reg;
 100         int is_tx;
 101         u32 residue;
 102
 103         unsigned int q_num;
 104         unsigned int q_comp_num;
 105         unsigned int port_num;
 106
 107         unsigned td_retry;
 108         unsigned td_queued:1;
 109         unsigned td_seen:1;
 110         unsigned td_desc_seen:1;
 111 };
 112
 113 struct cppi41_desc {
 114         u32 pd0;
 115         u32 pd1;
 116         u32 pd2;
 117         u32 pd3;
 118         u32 pd4;
 119         u32 pd5;
 120         u32 pd6;
 121         u32 pd7;
 122 } __aligned(32);
 123
 124 struct chan_queues {
 125         u16 submit;
 126         u16 complete;
 127 };
 128
 129 struct cppi41_dd {
 130         struct dma_device ddev;
 131
 132         void *qmgr_scratch;
 133         dma_addr_t scratch_phys;
 134
 135         struct cppi41_desc *cd;
 136         dma_addr_t descs_phys;
 137         u32 first_td_desc;
 138         struct cppi41_channel *chan_busy[ALLOC_DECS_NUM];
 139
 140         void __iomem *usbss_mem;
 141         void __iomem *ctrl_mem;
 142         void __iomem *sched_mem;
 143         void __iomem *qmgr_mem;
 144         unsigned int irq;
 145         const struct chan_queues *queues_rx;
 146         const struct chan_queues *queues_tx;
 147         struct chan_queues td_queue;
 148
 149         /* context for suspend/resume */
 150         unsigned int dma_tdfdq;
 151 };
 152
 153 #define FIST_COMPLETION_QUEUE   93
 154 static struct chan_queues usb_queues_tx[] = {
 155         /* USB0 ENDP 1 */
 156         [ 0] = { .submit = 32, .complete =  93},
 157         [ 1] = { .submit = 34, .complete =  94},
 158         [ 2] = { .submit = 36, .complete =  95},
 159         [ 3] = { .submit = 38, .complete =  96},
 160         [ 4] = { .submit = 40, .complete =  97},
 161         [ 5] = { .submit = 42, .complete =  98},
 162         [ 6] = { .submit = 44, .complete =  99},
 163         [ 7] = { .submit = 46, .complete = 100},
 164         [ 8] = { .submit = 48, .complete = 101},
 165         [ 9] = { .submit = 50, .complete = 102},
 166         [10] = { .submit = 52, .complete = 103},
 167         [11] = { .submit = 54, .complete = 104},
 168         [12] = { .submit = 56, .complete = 105},
 169         [13] = { .submit = 58, .complete = 106},
 170         [14] = { .submit = 60, .complete = 107},
 171
 172         /* USB1 ENDP1 */
 173         [15] = { .submit = 62, .complete = 125},
 174         [16] = { .submit = 64, .complete = 126},
 175         [17] = { .submit = 66, .complete = 127},
 176         [18] = { .submit = 68, .complete = 128},
 177         [19] = { .submit = 70, .complete = 129},
 178         [20] = { .submit = 72, .complete = 130},
 179         [21] = { .submit = 74, .complete = 131},
 180         [22] = { .submit = 76, .complete = 132},
 181         [23] = { .submit = 78, .complete = 133},
 182         [24] = { .submit = 80, .complete = 134},
 183         [25] = { .submit = 82, .complete = 135},
 184         [26] = { .submit = 84, .complete = 136},
 185         [27] = { .submit = 86, .complete = 137},
 186         [28] = { .submit = 88, .complete = 138},
 187         [29] = { .submit = 90, .complete = 139},
 188 };
 189
 190 static const struct chan_queues usb_queues_rx[] = {
 191         /* USB0 ENDP 1 */
 192         [ 0] = { .submit =  1, .complete = 109},
 193         [ 1] = { .submit =  2, .complete = 110},
 194         [ 2] = { .submit =  3, .complete = 111},
 195         [ 3] = { .submit =  4, .complete = 112},
 196         [ 4] = { .submit =  5, .complete = 113},
 197         [ 5] = { .submit =  6, .complete = 114},
 198         [ 6] = { .submit =  7, .complete = 115},
 199         [ 7] = { .submit =  8, .complete = 116},
 200         [ 8] = { .submit =  9, .complete = 117},
 201         [ 9] = { .submit = 10, .complete = 118},
 202         [10] = { .submit = 11, .complete = 119},
 203         [11] = { .submit = 12, .complete = 120},
 204         [12] = { .submit = 13, .complete = 121},
 205         [13] = { .submit = 14, .complete = 122},
 206         [14] = { .submit = 15, .complete = 123},
 207
 208         /* USB1 ENDP 1 */
 209         [15] = { .submit = 16, .complete = 141},
 210         [16] = { .submit = 17, .complete = 142},
 211         [17] = { .submit = 18, .complete = 143},
 212         [18] = { .submit = 19, .complete = 144},
 213         [19] = { .submit = 20, .complete = 145},
 214         [20] = { .submit = 21, .complete = 146},
 215         [21] = { .submit = 22, .complete = 147},
 216         [22] = { .submit = 23, .complete = 148},
 217         [23] = { .submit = 24, .complete = 149},
 218         [24] = { .submit = 25, .complete = 150},
 219         [25] = { .submit = 26, .complete = 151},
 220         [26] = { .submit = 27, .complete = 152},
 221         [27] = { .submit = 28, .complete = 153},
 222         [28] = { .submit = 29, .complete = 154},
 223         [29] = { .submit = 30, .complete = 155},
 224 };
 225
 226 struct cppi_glue_infos {
 227         irqreturn_t (*isr)(int irq, void *data);
 228         const struct chan_queues *queues_rx;
 229         const struct chan_queues *queues_tx;
 230         struct chan_queues td_queue;
 231 };
 232
 233 static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c)
 234 {
 235         return container_of(c, struct cppi41_channel, chan);
 236 }
 237
 238 static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc)
 239 {
 240         struct cppi41_channel *c;
 241         u32 descs_size;
 242         u32 desc_num;
 243
 244         descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM;
 245
 246         if (!((desc >= cdd->descs_phys) &&
 247                         (desc < (cdd->descs_phys + descs_size)))) {
 248                 return NULL;
 249         }
 250
 251         desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc);
 252         BUG_ON(desc_num >= ALLOC_DECS_NUM);
 253         c = cdd->chan_busy[desc_num];
 254         cdd->chan_busy[desc_num] = NULL;
 255         return c;
 256 }
 257
 258 static void cppi_writel(u32 val, void *__iomem *mem)
 259 {
 260         __raw_writel(val, mem);
 261 }
 262
 263 static u32 cppi_readl(void *__iomem *mem)
 264 {
 265         return __raw_readl(mem);
 266 }
 267
 268 static u32 pd_trans_len(u32 val)
 269 {
 270         return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1);
 271 }
 272
 273 static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num)
 274 {
 275         u32 desc;
 276
 277         desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num));
 278         desc &= ~0x1f;
 279         return desc;
 280 }
 281
 282 static irqreturn_t cppi41_irq(int irq, void *data)
 283 {
 284         struct cppi41_dd *cdd = data;
 285         struct cppi41_channel *c;
 286         u32 status;
 287         int i;
 288
 289         status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS);
 290         if (!(status & USBSS_IRQ_PD_COMP))
 291                 return IRQ_NONE;
 292         cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS);
 293
 294         for (i = QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE); i < QMGR_NUM_PEND;
 295                         i++) {
 296                 u32 val;
 297                 u32 q_num;
 298
 299                 val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i));
 300                 if (i == QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE) && val) {
 301                         u32 mask;
 302                         /* set corresponding bit for completetion Q 93 */
 303                         mask = 1 << QMGR_PENDING_BIT_Q(FIST_COMPLETION_QUEUE);
 304                         /* not set all bits for queues less than Q 93 */
 305                         mask--;
 306                         /* now invert and keep only Q 93+ set */
 307                         val &= ~mask;
 308                 }
 309
 310                 if (val)
 311                         __iormb();
 312
 313                 while (val) {
 314                         u32 desc, len;
 315
 316                         q_num = __fls(val);
 317                         val &= ~(1 << q_num);
 318                         q_num += 32 * i;
 319                         desc = cppi41_pop_desc(cdd, q_num);
 320                         c = desc_to_chan(cdd, desc);
 321                         if (WARN_ON(!c)) {
 322                                 pr_err("%s() q %d desc %08x\n", __func__,
 323                                                 q_num, desc);
 324                                 continue;
 325                         }
 326
 327                         if (c->desc->pd2 & PD2_ZERO_LENGTH)
 328                                 len = 0;
 329                         else
 330                                 len = pd_trans_len(c->desc->pd0);
 331
 332                         c->residue = pd_trans_len(c->desc->pd6) - len;
 333                         dma_cookie_complete(&c->txd);
 334                         c->txd.callback(c->txd.callback_param);
 335                 }
 336         }
 337         return IRQ_HANDLED;
 338 }
 339
 340 static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
 341 {
 342         dma_cookie_t cookie;
 343
 344         cookie = dma_cookie_assign(tx);
 345
 346         return cookie;
 347 }
 348
 349 static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan)
 350 {
 351         struct cppi41_channel *c = to_cpp41_chan(chan);
 352
 353         dma_cookie_init(chan);
 354         dma_async_tx_descriptor_init(&c->txd, chan);
 355         c->txd.tx_submit = cppi41_tx_submit;
 356
 357         if (!c->is_tx)
 358                 cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
 359
 360         return 0;
 361 }
 362
 363 static void cppi41_dma_free_chan_resources(struct dma_chan *chan)
 364 {
 365 }
 366
 367 static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan,
 368         dma_cookie_t cookie, struct dma_tx_state *txstate)
 369 {
 370         struct cppi41_channel *c = to_cpp41_chan(chan);
 371         enum dma_status ret;
 372
 373         /* lock */
 374         ret = dma_cookie_status(chan, cookie, txstate);
 375         if (txstate && ret == DMA_COMPLETE)
 376                 txstate->residue = c->residue;
 377         /* unlock */
 378
 379         return ret;
 380 }
 381
 382 static void push_desc_queue(struct cppi41_channel *c)
 383 {
 384         struct cppi41_dd *cdd = c->cdd;
 385         u32 desc_num;
 386         u32 desc_phys;
 387         u32 reg;
 388
 389         desc_phys = lower_32_bits(c->desc_phys);
 390         desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
 391         WARN_ON(cdd->chan_busy[desc_num]);
 392         cdd->chan_busy[desc_num] = c;
 393
 394         reg = (sizeof(struct cppi41_desc) - 24) / 4;
 395         reg |= desc_phys;
 396         cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num));
 397 }
 398
 399 static void cppi41_dma_issue_pending(struct dma_chan *chan)
 400 {
 401         struct cppi41_channel *c = to_cpp41_chan(chan);
 402         u32 reg;
 403
 404         c->residue = 0;
 405
 406         reg = GCR_CHAN_ENABLE;
 407         if (!c->is_tx) {
 408                 reg |= GCR_STARV_RETRY;
 409                 reg |= GCR_DESC_TYPE_HOST;
 410                 reg |= c->q_comp_num;
 411         }
 412
 413         cppi_writel(reg, c->gcr_reg);
 414
 415         /*
 416          * We don't use writel() but __raw_writel() so we have to make sure
 417          * that the DMA descriptor in coherent memory made to the main memory
 418          * before starting the dma engine.
 419          */
 420         __iowmb();
 421         push_desc_queue(c);
 422 }
 423
 424 static u32 get_host_pd0(u32 length)
 425 {
 426         u32 reg;
 427
 428         reg = DESC_TYPE_HOST << DESC_TYPE;
 429         reg |= length;
 430
 431         return reg;
 432 }
 433
 434 static u32 get_host_pd1(struct cppi41_channel *c)
 435 {
 436         u32 reg;
 437
 438         reg = 0;
 439
 440         return reg;
 441 }
 442
 443 static u32 get_host_pd2(struct cppi41_channel *c)
 444 {
 445         u32 reg;
 446
 447         reg = DESC_TYPE_USB;
 448         reg |= c->q_comp_num;
 449
 450         return reg;
 451 }
 452
 453 static u32 get_host_pd3(u32 length)
 454 {
 455         u32 reg;
 456
 457         /* PD3 = packet size */
 458         reg = length;
 459
 460         return reg;
 461 }
 462
 463 static u32 get_host_pd6(u32 length)
 464 {
 465         u32 reg;
 466
 467         /* PD6 buffer size */
 468         reg = DESC_PD_COMPLETE;
 469         reg |= length;
 470
 471         return reg;
 472 }
 473
 474 static u32 get_host_pd4_or_7(u32 addr)
 475 {
 476         u32 reg;
 477
 478         reg = addr;
 479
 480         return reg;
 481 }
 482
 483 static u32 get_host_pd5(void)
 484 {
 485         u32 reg;
 486
 487         reg = 0;
 488
 489         return reg;
 490 }
 491
 492 static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
 493         struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len,
 494         enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
 495 {
 496         struct cppi41_channel *c = to_cpp41_chan(chan);
 497         struct cppi41_desc *d;
 498         struct scatterlist *sg;
 499         unsigned int i;
 500
 501         d = c->desc;
 502         for_each_sg(sgl, sg, sg_len, i) {
 503                 u32 addr;
 504                 u32 len;
 505
 506                 /* We need to use more than one desc once musb supports sg */
 507                 addr = lower_32_bits(sg_dma_address(sg));
 508                 len = sg_dma_len(sg);
 509
 510                 d->pd0 = get_host_pd0(len);
 511                 d->pd1 = get_host_pd1(c);
 512                 d->pd2 = get_host_pd2(c);
 513                 d->pd3 = get_host_pd3(len);
 514                 d->pd4 = get_host_pd4_or_7(addr);
 515                 d->pd5 = get_host_pd5();
 516                 d->pd6 = get_host_pd6(len);
 517                 d->pd7 = get_host_pd4_or_7(addr);
 518
 519                 d++;
 520         }
 521
 522         return &c->txd;
 523 }
 524
 525 static void cppi41_compute_td_desc(struct cppi41_desc *d)
 526 {
 527         d->pd0 = DESC_TYPE_TEARD << DESC_TYPE;
 528 }
 529
 530 static int cppi41_tear_down_chan(struct cppi41_channel *c)
 531 {
 532         struct cppi41_dd *cdd = c->cdd;
 533         struct cppi41_desc *td;
 534         u32 reg;
 535         u32 desc_phys;
 536         u32 td_desc_phys;
 537
 538         td = cdd->cd;
 539         td += cdd->first_td_desc;
 540
 541         td_desc_phys = cdd->descs_phys;
 542         td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc);
 543
 544         if (!c->td_queued) {
 545                 cppi41_compute_td_desc(td);
 546                 __iowmb();
 547
 548                 reg = (sizeof(struct cppi41_desc) - 24) / 4;
 549                 reg |= td_desc_phys;
 550                 cppi_writel(reg, cdd->qmgr_mem +
 551                                 QMGR_QUEUE_D(cdd->td_queue.submit));
 552
 553                 reg = GCR_CHAN_ENABLE;
 554                 if (!c->is_tx) {
 555                         reg |= GCR_STARV_RETRY;
 556                         reg |= GCR_DESC_TYPE_HOST;
 557                         reg |= c->q_comp_num;
 558                 }
 559                 reg |= GCR_TEARDOWN;
 560                 cppi_writel(reg, c->gcr_reg);
 561                 c->td_queued = 1;
 562                 c->td_retry = 500;
 563         }
 564
 565         if (!c->td_seen || !c->td_desc_seen) {
 566
 567                 desc_phys = cppi41_pop_desc(cdd, cdd->td_queue.complete);
 568                 if (!desc_phys)
 569                         desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
 570
 571                 if (desc_phys == c->desc_phys) {
 572                         c->td_desc_seen = 1;
 573
 574                 } else if (desc_phys == td_desc_phys) {
 575                         u32 pd0;
 576
 577                         __iormb();
 578                         pd0 = td->pd0;
 579                         WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD);
 580                         WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX));
 581                         WARN_ON((pd0 & 0x1f) != c->port_num);
 582                         c->td_seen = 1;
 583                 } else if (desc_phys) {
 584                         WARN_ON_ONCE(1);
 585                 }
 586         }
 587         c->td_retry--;
 588         /*
 589          * If the TX descriptor / channel is in use, the caller needs to poke
 590          * his TD bit multiple times. After that he hardware releases the
 591          * transfer descriptor followed by TD descriptor. Waiting seems not to
 592          * cause any difference.
 593          * RX seems to be thrown out right away. However once the TearDown
 594          * descriptor gets through we are done. If we have seens the transfer
 595          * descriptor before the TD we fetch it from enqueue, it has to be
 596          * there waiting for us.
 597          */
 598         if (!c->td_seen && c->td_retry) {
 599                 udelay(1);
 600                 return -EAGAIN;
 601         }
 602         WARN_ON(!c->td_retry);
 603
 604         if (!c->td_desc_seen) {
 605                 desc_phys = cppi41_pop_desc(cdd, c->q_num);
 606                 if (!desc_phys)
 607                         desc_phys = cppi41_pop_desc(cdd, c->q_comp_num);
 608                 WARN_ON(!desc_phys);
 609         }
 610
 611         c->td_queued = 0;
 612         c->td_seen = 0;
 613         c->td_desc_seen = 0;
 614         cppi_writel(0, c->gcr_reg);
 615         return 0;
 616 }
 617
 618 static int cppi41_stop_chan(struct dma_chan *chan)
 619 {
 620         struct cppi41_channel *c = to_cpp41_chan(chan);
 621         struct cppi41_dd *cdd = c->cdd;
 622         u32 desc_num;
 623         u32 desc_phys;
 624         int ret;
 625
 626         desc_phys = lower_32_bits(c->desc_phys);
 627         desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);
 628         if (!cdd->chan_busy[desc_num])
 629                 return 0;
 630
 631         ret = cppi41_tear_down_chan(c);
 632         if (ret)
 633                 return ret;
 634
 635         WARN_ON(!cdd->chan_busy[desc_num]);
 636         cdd->chan_busy[desc_num] = NULL;
 637
 638         return 0;
 639 }
 640
 641 static void cleanup_chans(struct cppi41_dd *cdd)
 642 {
 643         while (!list_empty(&cdd->ddev.channels)) {
 644                 struct cppi41_channel *cchan;
 645
 646                 cchan = list_first_entry(&cdd->ddev.channels,
 647                                 struct cppi41_channel, chan.device_node);
 648                 list_del(&cchan->chan.device_node);
 649                 kfree(cchan);
 650         }
 651 }
 652
 653 static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd)
 654 {
 655         struct cppi41_channel *cchan;
 656         int i;
 657         int ret;
 658         u32 n_chans;
 659
 660         ret = of_property_read_u32(dev->of_node, "#dma-channels",
 661                         &n_chans);
 662         if (ret)
 663                 return ret;
 664         /*
 665          * The channels can only be used as TX or as RX. So we add twice
 666          * that much dma channels because USB can only do RX or TX.
 667          */
 668         n_chans *= 2;
 669
 670         for (i = 0; i < n_chans; i++) {
 671                 cchan = kzalloc(sizeof(*cchan), GFP_KERNEL);
 672                 if (!cchan)
 673                         goto err;
 674
 675                 cchan->cdd = cdd;
 676                 if (i & 1) {
 677                         cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1);
 678                         cchan->is_tx = 1;
 679                 } else {
 680                         cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1);
 681                         cchan->is_tx = 0;
 682                 }
 683                 cchan->port_num = i >> 1;
 684                 cchan->desc = &cdd->cd[i];
 685                 cchan->desc_phys = cdd->descs_phys;
 686                 cchan->desc_phys += i * sizeof(struct cppi41_desc);
 687                 cchan->chan.device = &cdd->ddev;
 688                 list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels);
 689         }
 690         cdd->first_td_desc = n_chans;
 691
 692         return 0;
 693 err:
 694         cleanup_chans(cdd);
 695         return -ENOMEM;
 696 }
 697
 698 static void purge_descs(struct device *dev, struct cppi41_dd *cdd)
 699 {
 700         unsigned int mem_decs;
 701         int i;
 702
 703         mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc);
 704
 705         for (i = 0; i < DESCS_AREAS; i++) {
 706
 707                 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i));
 708                 cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i));
 709
 710                 dma_free_coherent(dev, mem_decs, cdd->cd,
 711                                 cdd->descs_phys);
 712         }
 713 }
 714
 715 static void disable_sched(struct cppi41_dd *cdd)
 716 {
 717         cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
 718 }
 719
 720 static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd)
 721 {
 722         disable_sched(cdd);
 723
 724         purge_descs(dev, cdd);
 725
 726         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 727         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 728         dma_free_coherent(dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch,
 729                         cdd->scratch_phys);
 730 }
 731
 732 static int init_descs(struct device *dev, struct cppi41_dd *cdd)
 733 {
 734         unsigned int desc_size;
 735         unsigned int mem_decs;
 736         int i;
 737         u32 reg;
 738         u32 idx;
 739
 740         BUILD_BUG_ON(sizeof(struct cppi41_desc) &
 741                         (sizeof(struct cppi41_desc) - 1));
 742         BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32);
 743         BUILD_BUG_ON(ALLOC_DECS_NUM < 32);
 744
 745         desc_size = sizeof(struct cppi41_desc);
 746         mem_decs = ALLOC_DECS_NUM * desc_size;
 747
 748         idx = 0;
 749         for (i = 0; i < DESCS_AREAS; i++) {
 750
 751                 reg = idx << QMGR_MEMCTRL_IDX_SH;
 752                 reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH;
 753                 reg |= ilog2(ALLOC_DECS_NUM) - 5;
 754
 755                 BUILD_BUG_ON(DESCS_AREAS != 1);
 756                 cdd->cd = dma_alloc_coherent(dev, mem_decs,
 757                                 &cdd->descs_phys, GFP_KERNEL);
 758                 if (!cdd->cd)
 759                         return -ENOMEM;
 760
 761                 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
 762                 cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i));
 763
 764                 idx += ALLOC_DECS_NUM;
 765         }
 766         return 0;
 767 }
 768
 769 static void init_sched(struct cppi41_dd *cdd)
 770 {
 771         unsigned ch;
 772         unsigned word;
 773         u32 reg;
 774
 775         word = 0;
 776         cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL);
 777         for (ch = 0; ch < 15 * 2; ch += 2) {
 778
 779                 reg = SCHED_ENTRY0_CHAN(ch);
 780                 reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX;
 781
 782                 reg |= SCHED_ENTRY2_CHAN(ch + 1);
 783                 reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX;
 784                 cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word));
 785                 word++;
 786         }
 787         reg = 15 * 2 * 2 - 1;
 788         reg |= DMA_SCHED_CTRL_EN;
 789         cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL);
 790 }
 791
 792 static int init_cppi41(struct device *dev, struct cppi41_dd *cdd)
 793 {
 794         int ret;
 795
 796         BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1));
 797         cdd->qmgr_scratch = dma_alloc_coherent(dev, QMGR_SCRATCH_SIZE,
 798                         &cdd->scratch_phys, GFP_KERNEL);
 799         if (!cdd->qmgr_scratch)
 800                 return -ENOMEM;
 801
 802         cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
 803         cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
 804         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
 805
 806         ret = init_descs(dev, cdd);
 807         if (ret)
 808                 goto err_td;
 809
 810         cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ);
 811         init_sched(cdd);
 812         return 0;
 813 err_td:
 814         deinit_cppi41(dev, cdd);
 815         return ret;
 816 }
 817
 818 static struct platform_driver cpp41_dma_driver;
 819 /*
 820  * The param format is:
 821  * X Y
 822  * X: Port
 823  * Y: 0 = RX else TX
 824  */
 825 #define INFO_PORT       0
 826 #define INFO_IS_TX      1
 827
 828 static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param)
 829 {
 830         struct cppi41_channel *cchan;
 831         struct cppi41_dd *cdd;
 832         const struct chan_queues *queues;
 833         u32 *num = param;
 834
 835         if (chan->device->dev->driver != &cpp41_dma_driver.driver)
 836                 return false;
 837
 838         cchan = to_cpp41_chan(chan);
 839
 840         if (cchan->port_num != num[INFO_PORT])
 841                 return false;
 842
 843         if (cchan->is_tx && !num[INFO_IS_TX])
 844                 return false;
 845         cdd = cchan->cdd;
 846         if (cchan->is_tx)
 847                 queues = cdd->queues_tx;
 848         else
 849                 queues = cdd->queues_rx;
 850
 851         BUILD_BUG_ON(ARRAY_SIZE(usb_queues_rx) != ARRAY_SIZE(usb_queues_tx));
 852         if (WARN_ON(cchan->port_num > ARRAY_SIZE(usb_queues_rx)))
 853                 return false;
 854
 855         cchan->q_num = queues[cchan->port_num].submit;
 856         cchan->q_comp_num = queues[cchan->port_num].complete;
 857         return true;
 858 }
 859
 860 static struct of_dma_filter_info cpp41_dma_info = {
 861         .filter_fn = cpp41_dma_filter_fn,
 862 };
 863
 864 static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec,
 865                 struct of_dma *ofdma)
 866 {
 867         int count = dma_spec->args_count;
 868         struct of_dma_filter_info *info = ofdma->of_dma_data;
 869
 870         if (!info || !info->filter_fn)
 871                 return NULL;
 872
 873         if (count != 2)
 874                 return NULL;
 875
 876         return dma_request_channel(info->dma_cap, info->filter_fn,
 877                         &dma_spec->args[0]);
 878 }
 879
 880 static const struct cppi_glue_infos usb_infos = {
 881         .isr = cppi41_irq,
 882         .queues_rx = usb_queues_rx,
 883         .queues_tx = usb_queues_tx,
 884         .td_queue = { .submit = 31, .complete = 0 },
 885 };
 886
 887 static const struct of_device_id cppi41_dma_ids[] = {
 888         { .compatible = "ti,am3359-cppi41", .data = &usb_infos},
 889         {},
 890 };
 891 MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
 892
 893 static const struct cppi_glue_infos *get_glue_info(struct device *dev)
 894 {
 895         const struct of_device_id *of_id;
 896
 897         of_id = of_match_node(cppi41_dma_ids, dev->of_node);
 898         if (!of_id)
 899                 return NULL;
 900         return of_id->data;
 901 }
 902
 903 #define CPPI41_DMA_BUSWIDTHS    (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
 904                                 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
 905                                 BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
 906                                 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
 907
 908 static int cppi41_dma_probe(struct platform_device *pdev)
 909 {
 910         struct cppi41_dd *cdd;
 911         struct device *dev = &pdev->dev;
 912         const struct cppi_glue_infos *glue_info;
 913         int irq;
 914         int ret;
 915
 916         glue_info = get_glue_info(dev);
 917         if (!glue_info)
 918                 return -EINVAL;
 919
 920         cdd = devm_kzalloc(&pdev->dev, sizeof(*cdd), GFP_KERNEL);
 921         if (!cdd)
 922                 return -ENOMEM;
 923
 924         dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask);
 925         cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources;
 926         cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources;
 927         cdd->ddev.device_tx_status = cppi41_dma_tx_status;
 928         cdd->ddev.device_issue_pending = cppi41_dma_issue_pending;
 929         cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg;
 930         cdd->ddev.device_terminate_all = cppi41_stop_chan;
 931         cdd->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 932         cdd->ddev.src_addr_widths = CPPI41_DMA_BUSWIDTHS;
 933         cdd->ddev.dst_addr_widths = CPPI41_DMA_BUSWIDTHS;
 934         cdd->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 935         cdd->ddev.dev = dev;
 936         INIT_LIST_HEAD(&cdd->ddev.channels);
 937         cpp41_dma_info.dma_cap = cdd->ddev.cap_mask;
 938
 939         cdd->usbss_mem = of_iomap(dev->of_node, 0);
 940         cdd->ctrl_mem = of_iomap(dev->of_node, 1);
 941         cdd->sched_mem = of_iomap(dev->of_node, 2);
 942         cdd->qmgr_mem = of_iomap(dev->of_node, 3);
 943
 944         if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem ||
 945                         !cdd->qmgr_mem)
 946                 return -ENXIO;
 947
 948         pm_runtime_enable(dev);
 949         ret = pm_runtime_get_sync(dev);
 950         if (ret < 0)
 951                 goto err_get_sync;
 952
 953         cdd->queues_rx = glue_info->queues_rx;
 954         cdd->queues_tx = glue_info->queues_tx;
 955         cdd->td_queue = glue_info->td_queue;
 956
 957         ret = init_cppi41(dev, cdd);
 958         if (ret)
 959                 goto err_init_cppi;
 960
 961         ret = cppi41_add_chans(dev, cdd);
 962         if (ret)
 963                 goto err_chans;
 964
 965         irq = irq_of_parse_and_map(dev->of_node, 0);
 966         if (!irq) {
 967                 ret = -EINVAL;
 968                 goto err_irq;
 969         }
 970
 971         cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
 972
 973         ret = devm_request_irq(&pdev->dev, irq, glue_info->isr, IRQF_SHARED,
 974                         dev_name(dev), cdd);
 975         if (ret)
 976                 goto err_irq;
 977         cdd->irq = irq;
 978
 979         ret = dma_async_device_register(&cdd->ddev);
 980         if (ret)
 981                 goto err_dma_reg;
 982
 983         ret = of_dma_controller_register(dev->of_node,
 984                         cppi41_dma_xlate, &cpp41_dma_info);
 985         if (ret)
 986                 goto err_of;
 987
 988         platform_set_drvdata(pdev, cdd);
 989         return 0;
 990 err_of:
 991         dma_async_device_unregister(&cdd->ddev);
 992 err_dma_reg:
 993 err_irq:
 994         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
 995         cleanup_chans(cdd);
 996 err_chans:
 997         deinit_cppi41(dev, cdd);
 998 err_init_cppi:
 999         pm_runtime_put(dev);
1000 err_get_sync:
1001         pm_runtime_disable(dev);
1002         iounmap(cdd->usbss_mem);
1003         iounmap(cdd->ctrl_mem);
1004         iounmap(cdd->sched_mem);
1005         iounmap(cdd->qmgr_mem);
1006         return ret;
1007 }
1008
1009 static int cppi41_dma_remove(struct platform_device *pdev)
1010 {
1011         struct cppi41_dd *cdd = platform_get_drvdata(pdev);
1012
1013         of_dma_controller_free(pdev->dev.of_node);
1014         dma_async_device_unregister(&cdd->ddev);
1015
1016         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1017         devm_free_irq(&pdev->dev, cdd->irq, cdd);
1018         cleanup_chans(cdd);
1019         deinit_cppi41(&pdev->dev, cdd);
1020         iounmap(cdd->usbss_mem);
1021         iounmap(cdd->ctrl_mem);
1022         iounmap(cdd->sched_mem);
1023         iounmap(cdd->qmgr_mem);
1024         pm_runtime_put(&pdev->dev);
1025         pm_runtime_disable(&pdev->dev);
1026         return 0;
1027 }
1028
1029 #ifdef CONFIG_PM_SLEEP
1030 static int cppi41_suspend(struct device *dev)
1031 {
1032         struct cppi41_dd *cdd = dev_get_drvdata(dev);
1033
1034         cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ);
1035         cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
1036         disable_sched(cdd);
1037
1038         return 0;
1039 }
1040
1041 static int cppi41_resume(struct device *dev)
1042 {
1043         struct cppi41_dd *cdd = dev_get_drvdata(dev);
1044         struct cppi41_channel *c;
1045         int i;
1046
1047         for (i = 0; i < DESCS_AREAS; i++)
1048                 cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
1049
1050         list_for_each_entry(c, &cdd->ddev.channels, chan.device_node)
1051                 if (!c->is_tx)
1052                         cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0);
1053
1054         init_sched(cdd);
1055
1056         cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ);
1057         cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE);
1058         cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE);
1059         cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE);
1060
1061         cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
1062
1063         return 0;
1064 }
1065 #endif
1066
1067 static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);
1068
1069 static struct platform_driver cpp41_dma_driver = {
1070         .probe  = cppi41_dma_probe,
1071         .remove = cppi41_dma_remove,
1072         .driver = {
1073                 .name = "cppi41-dma-engine",
1074                 .pm = &cppi41_pm_ops,
1075                 .of_match_table = of_match_ptr(cppi41_dma_ids),
1076         },
1077 };
1078
1079 module_platform_driver(cpp41_dma_driver);
1080 MODULE_LICENSE("GPL");
1081 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");