1 #include <linux/device.h> 2 #include <linux/dma-mapping.h> 3 #include <linux/dmaengine.h> 4 #include <linux/sizes.h> 5 #include <linux/platform_device.h> 6 #include <linux/of.h> 7 8 #include "musb_core.h" 9 10 #define RNDIS_REG(x) (0x80 + ((x - 1) * 4)) 11 12 #define EP_MODE_AUTOREG_NONE 0 13 #define EP_MODE_AUTOREG_ALL_NEOP 1 14 #define EP_MODE_AUTOREG_ALWAYS 3 15 16 #define EP_MODE_DMA_TRANSPARENT 0 17 #define EP_MODE_DMA_RNDIS 1 18 #define EP_MODE_DMA_GEN_RNDIS 3 19 20 #define USB_CTRL_TX_MODE 0x70 21 #define USB_CTRL_RX_MODE 0x74 22 #define USB_CTRL_AUTOREQ 0xd0 23 #define USB_TDOWN 0xd8 24 25 struct cppi41_dma_channel { 26 struct dma_channel channel; 27 struct cppi41_dma_controller *controller; 28 struct musb_hw_ep *hw_ep; 29 struct dma_chan *dc; 30 dma_cookie_t cookie; 31 u8 port_num; 32 u8 is_tx; 33 u8 is_allocated; 34 u8 usb_toggle; 35 36 dma_addr_t buf_addr; 37 u32 total_len; 38 u32 prog_len; 39 u32 transferred; 40 u32 packet_sz; 41 struct list_head tx_check; 42 int tx_zlp; 43 }; 44 45 #define MUSB_DMA_NUM_CHANNELS 15 46 47 struct cppi41_dma_controller { 48 struct dma_controller controller; 49 struct cppi41_dma_channel rx_channel[MUSB_DMA_NUM_CHANNELS]; 50 struct cppi41_dma_channel tx_channel[MUSB_DMA_NUM_CHANNELS]; 51 struct musb *musb; 52 struct hrtimer early_tx; 53 struct list_head early_tx_list; 54 u32 rx_mode; 55 u32 tx_mode; 56 u32 auto_req; 57 }; 58 59 static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel) 60 { 61 u16 csr; 62 u8 toggle; 63 64 if (cppi41_channel->is_tx) 65 return; 66 if (!is_host_active(cppi41_channel->controller->musb)) 67 return; 68 69 csr = musb_readw(cppi41_channel->hw_ep->regs, MUSB_RXCSR); 70 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0; 71 72 cppi41_channel->usb_toggle = toggle; 73 } 74 75 static void update_rx_toggle(struct cppi41_dma_channel *cppi41_channel) 76 { 77 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 78 struct musb *musb = hw_ep->musb; 79 u16 csr; 80 u8 toggle; 81 82 if (cppi41_channel->is_tx) 83 return; 84 if (!is_host_active(musb)) 85 return; 86 87 musb_ep_select(musb->mregs, hw_ep->epnum); 88 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 89 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0; 90 91 /* 92 * AM335x Advisory 1.0.13: Due to internal synchronisation error the 93 * data toggle may reset from DATA1 to DATA0 during receiving data from 94 * more than one endpoint. 95 */ 96 if (!toggle && toggle == cppi41_channel->usb_toggle) { 97 csr |= MUSB_RXCSR_H_DATATOGGLE | MUSB_RXCSR_H_WR_DATATOGGLE; 98 musb_writew(cppi41_channel->hw_ep->regs, MUSB_RXCSR, csr); 99 dev_dbg(cppi41_channel->controller->musb->controller, 100 "Restoring DATA1 toggle.\n"); 101 } 102 103 cppi41_channel->usb_toggle = toggle; 104 } 105 106 static bool musb_is_tx_fifo_empty(struct musb_hw_ep *hw_ep) 107 { 108 u8 epnum = hw_ep->epnum; 109 struct musb *musb = hw_ep->musb; 110 void __iomem *epio = musb->endpoints[epnum].regs; 111 u16 csr; 112 113 musb_ep_select(musb->mregs, hw_ep->epnum); 114 csr = musb_readw(epio, MUSB_TXCSR); 115 if (csr & MUSB_TXCSR_TXPKTRDY) 116 return false; 117 return true; 118 } 119 120 static void cppi41_dma_callback(void *private_data); 121 122 static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel) 123 { 124 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 125 struct musb *musb = hw_ep->musb; 126 void __iomem *epio = hw_ep->regs; 127 u16 csr; 128 129 if (!cppi41_channel->prog_len || 130 (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE)) { 131 132 /* done, complete */ 133 cppi41_channel->channel.actual_len = 134 cppi41_channel->transferred; 135 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE; 136 cppi41_channel->channel.rx_packet_done = true; 137 138 /* 139 * transmit ZLP using PIO mode for transfers which size is 140 * multiple of EP packet size. 141 */ 142 if (cppi41_channel->tx_zlp && (cppi41_channel->transferred % 143 cppi41_channel->packet_sz) == 0) { 144 musb_ep_select(musb->mregs, hw_ep->epnum); 145 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY; 146 musb_writew(epio, MUSB_TXCSR, csr); 147 } 148 musb_dma_completion(musb, hw_ep->epnum, cppi41_channel->is_tx); 149 } else { 150 /* next iteration, reload */ 151 struct dma_chan *dc = cppi41_channel->dc; 152 struct dma_async_tx_descriptor *dma_desc; 153 enum dma_transfer_direction direction; 154 u32 remain_bytes; 155 156 cppi41_channel->buf_addr += cppi41_channel->packet_sz; 157 158 remain_bytes = cppi41_channel->total_len; 159 remain_bytes -= cppi41_channel->transferred; 160 remain_bytes = min(remain_bytes, cppi41_channel->packet_sz); 161 cppi41_channel->prog_len = remain_bytes; 162 163 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV 164 : DMA_DEV_TO_MEM; 165 dma_desc = dmaengine_prep_slave_single(dc, 166 cppi41_channel->buf_addr, 167 remain_bytes, 168 direction, 169 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 170 if (WARN_ON(!dma_desc)) 171 return; 172 173 dma_desc->callback = cppi41_dma_callback; 174 dma_desc->callback_param = &cppi41_channel->channel; 175 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc); 176 dma_async_issue_pending(dc); 177 178 if (!cppi41_channel->is_tx) { 179 musb_ep_select(musb->mregs, hw_ep->epnum); 180 csr = musb_readw(epio, MUSB_RXCSR); 181 csr |= MUSB_RXCSR_H_REQPKT; 182 musb_writew(epio, MUSB_RXCSR, csr); 183 } 184 } 185 } 186 187 static enum hrtimer_restart cppi41_recheck_tx_req(struct hrtimer *timer) 188 { 189 struct cppi41_dma_controller *controller; 190 struct cppi41_dma_channel *cppi41_channel, *n; 191 struct musb *musb; 192 unsigned long flags; 193 enum hrtimer_restart ret = HRTIMER_NORESTART; 194 195 controller = container_of(timer, struct cppi41_dma_controller, 196 early_tx); 197 musb = controller->musb; 198 199 spin_lock_irqsave(&musb->lock, flags); 200 list_for_each_entry_safe(cppi41_channel, n, &controller->early_tx_list, 201 tx_check) { 202 bool empty; 203 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 204 205 empty = musb_is_tx_fifo_empty(hw_ep); 206 if (empty) { 207 list_del_init(&cppi41_channel->tx_check); 208 cppi41_trans_done(cppi41_channel); 209 } 210 } 211 212 if (!list_empty(&controller->early_tx_list) && 213 !hrtimer_is_queued(&controller->early_tx)) { 214 ret = HRTIMER_RESTART; 215 hrtimer_forward_now(&controller->early_tx, 216 ktime_set(0, 20 * NSEC_PER_USEC)); 217 } 218 219 spin_unlock_irqrestore(&musb->lock, flags); 220 return ret; 221 } 222 223 static void cppi41_dma_callback(void *private_data) 224 { 225 struct dma_channel *channel = private_data; 226 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 227 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 228 struct musb *musb = hw_ep->musb; 229 unsigned long flags; 230 struct dma_tx_state txstate; 231 u32 transferred; 232 bool empty; 233 234 spin_lock_irqsave(&musb->lock, flags); 235 236 dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie, 237 &txstate); 238 transferred = cppi41_channel->prog_len - txstate.residue; 239 cppi41_channel->transferred += transferred; 240 241 dev_dbg(musb->controller, "DMA transfer done on hw_ep=%d bytes=%d/%d\n", 242 hw_ep->epnum, cppi41_channel->transferred, 243 cppi41_channel->total_len); 244 245 update_rx_toggle(cppi41_channel); 246 247 if (cppi41_channel->transferred == cppi41_channel->total_len || 248 transferred < cppi41_channel->packet_sz) 249 cppi41_channel->prog_len = 0; 250 251 empty = musb_is_tx_fifo_empty(hw_ep); 252 if (empty) { 253 cppi41_trans_done(cppi41_channel); 254 } else { 255 struct cppi41_dma_controller *controller; 256 /* 257 * On AM335x it has been observed that the TX interrupt fires 258 * too early that means the TXFIFO is not yet empty but the DMA 259 * engine says that it is done with the transfer. We don't 260 * receive a FIFO empty interrupt so the only thing we can do is 261 * to poll for the bit. On HS it usually takes 2us, on FS around 262 * 110us - 150us depending on the transfer size. 263 * We spin on HS (no longer than than 25us and setup a timer on 264 * FS to check for the bit and complete the transfer. 265 */ 266 controller = cppi41_channel->controller; 267 268 if (musb->g.speed == USB_SPEED_HIGH) { 269 unsigned wait = 25; 270 271 do { 272 empty = musb_is_tx_fifo_empty(hw_ep); 273 if (empty) 274 break; 275 wait--; 276 if (!wait) 277 break; 278 udelay(1); 279 } while (1); 280 281 empty = musb_is_tx_fifo_empty(hw_ep); 282 if (empty) { 283 cppi41_trans_done(cppi41_channel); 284 goto out; 285 } 286 } 287 list_add_tail(&cppi41_channel->tx_check, 288 &controller->early_tx_list); 289 if (!hrtimer_is_queued(&controller->early_tx)) { 290 unsigned long usecs = cppi41_channel->total_len / 10; 291 292 hrtimer_start_range_ns(&controller->early_tx, 293 ktime_set(0, usecs * NSEC_PER_USEC), 294 20 * NSEC_PER_USEC, 295 HRTIMER_MODE_REL); 296 } 297 } 298 out: 299 spin_unlock_irqrestore(&musb->lock, flags); 300 } 301 302 static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old) 303 { 304 unsigned shift; 305 306 shift = (ep - 1) * 2; 307 old &= ~(3 << shift); 308 old |= mode << shift; 309 return old; 310 } 311 312 static void cppi41_set_dma_mode(struct cppi41_dma_channel *cppi41_channel, 313 unsigned mode) 314 { 315 struct cppi41_dma_controller *controller = cppi41_channel->controller; 316 u32 port; 317 u32 new_mode; 318 u32 old_mode; 319 320 if (cppi41_channel->is_tx) 321 old_mode = controller->tx_mode; 322 else 323 old_mode = controller->rx_mode; 324 port = cppi41_channel->port_num; 325 new_mode = update_ep_mode(port, mode, old_mode); 326 327 if (new_mode == old_mode) 328 return; 329 if (cppi41_channel->is_tx) { 330 controller->tx_mode = new_mode; 331 musb_writel(controller->musb->ctrl_base, USB_CTRL_TX_MODE, 332 new_mode); 333 } else { 334 controller->rx_mode = new_mode; 335 musb_writel(controller->musb->ctrl_base, USB_CTRL_RX_MODE, 336 new_mode); 337 } 338 } 339 340 static void cppi41_set_autoreq_mode(struct cppi41_dma_channel *cppi41_channel, 341 unsigned mode) 342 { 343 struct cppi41_dma_controller *controller = cppi41_channel->controller; 344 u32 port; 345 u32 new_mode; 346 u32 old_mode; 347 348 old_mode = controller->auto_req; 349 port = cppi41_channel->port_num; 350 new_mode = update_ep_mode(port, mode, old_mode); 351 352 if (new_mode == old_mode) 353 return; 354 controller->auto_req = new_mode; 355 musb_writel(controller->musb->ctrl_base, USB_CTRL_AUTOREQ, new_mode); 356 } 357 358 static bool cppi41_configure_channel(struct dma_channel *channel, 359 u16 packet_sz, u8 mode, 360 dma_addr_t dma_addr, u32 len) 361 { 362 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 363 struct dma_chan *dc = cppi41_channel->dc; 364 struct dma_async_tx_descriptor *dma_desc; 365 enum dma_transfer_direction direction; 366 struct musb *musb = cppi41_channel->controller->musb; 367 unsigned use_gen_rndis = 0; 368 369 dev_dbg(musb->controller, 370 "configure ep%d/%x packet_sz=%d, mode=%d, dma_addr=0x%llx, len=%d is_tx=%d\n", 371 cppi41_channel->port_num, RNDIS_REG(cppi41_channel->port_num), 372 packet_sz, mode, (unsigned long long) dma_addr, 373 len, cppi41_channel->is_tx); 374 375 cppi41_channel->buf_addr = dma_addr; 376 cppi41_channel->total_len = len; 377 cppi41_channel->transferred = 0; 378 cppi41_channel->packet_sz = packet_sz; 379 cppi41_channel->tx_zlp = (cppi41_channel->is_tx && mode) ? 1 : 0; 380 381 /* 382 * Due to AM335x' Advisory 1.0.13 we are not allowed to transfer more 383 * than max packet size at a time. 384 */ 385 if (cppi41_channel->is_tx) 386 use_gen_rndis = 1; 387 388 if (use_gen_rndis) { 389 /* RNDIS mode */ 390 if (len > packet_sz) { 391 musb_writel(musb->ctrl_base, 392 RNDIS_REG(cppi41_channel->port_num), len); 393 /* gen rndis */ 394 cppi41_set_dma_mode(cppi41_channel, 395 EP_MODE_DMA_GEN_RNDIS); 396 397 /* auto req */ 398 cppi41_set_autoreq_mode(cppi41_channel, 399 EP_MODE_AUTOREG_ALL_NEOP); 400 } else { 401 musb_writel(musb->ctrl_base, 402 RNDIS_REG(cppi41_channel->port_num), 0); 403 cppi41_set_dma_mode(cppi41_channel, 404 EP_MODE_DMA_TRANSPARENT); 405 cppi41_set_autoreq_mode(cppi41_channel, 406 EP_MODE_AUTOREG_NONE); 407 } 408 } else { 409 /* fallback mode */ 410 cppi41_set_dma_mode(cppi41_channel, EP_MODE_DMA_TRANSPARENT); 411 cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREG_NONE); 412 len = min_t(u32, packet_sz, len); 413 } 414 cppi41_channel->prog_len = len; 415 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; 416 dma_desc = dmaengine_prep_slave_single(dc, dma_addr, len, direction, 417 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 418 if (!dma_desc) 419 return false; 420 421 dma_desc->callback = cppi41_dma_callback; 422 dma_desc->callback_param = channel; 423 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc); 424 cppi41_channel->channel.rx_packet_done = false; 425 426 save_rx_toggle(cppi41_channel); 427 dma_async_issue_pending(dc); 428 return true; 429 } 430 431 static struct dma_channel *cppi41_dma_channel_allocate(struct dma_controller *c, 432 struct musb_hw_ep *hw_ep, u8 is_tx) 433 { 434 struct cppi41_dma_controller *controller = container_of(c, 435 struct cppi41_dma_controller, controller); 436 struct cppi41_dma_channel *cppi41_channel = NULL; 437 u8 ch_num = hw_ep->epnum - 1; 438 439 if (ch_num >= MUSB_DMA_NUM_CHANNELS) 440 return NULL; 441 442 if (is_tx) 443 cppi41_channel = &controller->tx_channel[ch_num]; 444 else 445 cppi41_channel = &controller->rx_channel[ch_num]; 446 447 if (!cppi41_channel->dc) 448 return NULL; 449 450 if (cppi41_channel->is_allocated) 451 return NULL; 452 453 cppi41_channel->hw_ep = hw_ep; 454 cppi41_channel->is_allocated = 1; 455 456 return &cppi41_channel->channel; 457 } 458 459 static void cppi41_dma_channel_release(struct dma_channel *channel) 460 { 461 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 462 463 if (cppi41_channel->is_allocated) { 464 cppi41_channel->is_allocated = 0; 465 channel->status = MUSB_DMA_STATUS_FREE; 466 channel->actual_len = 0; 467 } 468 } 469 470 static int cppi41_dma_channel_program(struct dma_channel *channel, 471 u16 packet_sz, u8 mode, 472 dma_addr_t dma_addr, u32 len) 473 { 474 int ret; 475 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 476 int hb_mult = 0; 477 478 BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN || 479 channel->status == MUSB_DMA_STATUS_BUSY); 480 481 if (is_host_active(cppi41_channel->controller->musb)) { 482 if (cppi41_channel->is_tx) 483 hb_mult = cppi41_channel->hw_ep->out_qh->hb_mult; 484 else 485 hb_mult = cppi41_channel->hw_ep->in_qh->hb_mult; 486 } 487 488 channel->status = MUSB_DMA_STATUS_BUSY; 489 channel->actual_len = 0; 490 491 if (hb_mult) 492 packet_sz = hb_mult * (packet_sz & 0x7FF); 493 494 ret = cppi41_configure_channel(channel, packet_sz, mode, dma_addr, len); 495 if (!ret) 496 channel->status = MUSB_DMA_STATUS_FREE; 497 498 return ret; 499 } 500 501 static int cppi41_is_compatible(struct dma_channel *channel, u16 maxpacket, 502 void *buf, u32 length) 503 { 504 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 505 struct cppi41_dma_controller *controller = cppi41_channel->controller; 506 struct musb *musb = controller->musb; 507 508 if (is_host_active(musb)) { 509 WARN_ON(1); 510 return 1; 511 } 512 if (cppi41_channel->hw_ep->ep_in.type != USB_ENDPOINT_XFER_BULK) 513 return 0; 514 if (cppi41_channel->is_tx) 515 return 1; 516 /* AM335x Advisory 1.0.13. No workaround for device RX mode */ 517 return 0; 518 } 519 520 static int cppi41_dma_channel_abort(struct dma_channel *channel) 521 { 522 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 523 struct cppi41_dma_controller *controller = cppi41_channel->controller; 524 struct musb *musb = controller->musb; 525 void __iomem *epio = cppi41_channel->hw_ep->regs; 526 int tdbit; 527 int ret; 528 unsigned is_tx; 529 u16 csr; 530 531 is_tx = cppi41_channel->is_tx; 532 dev_dbg(musb->controller, "abort channel=%d, is_tx=%d\n", 533 cppi41_channel->port_num, is_tx); 534 535 if (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE) 536 return 0; 537 538 list_del_init(&cppi41_channel->tx_check); 539 if (is_tx) { 540 csr = musb_readw(epio, MUSB_TXCSR); 541 csr &= ~MUSB_TXCSR_DMAENAB; 542 musb_writew(epio, MUSB_TXCSR, csr); 543 } else { 544 csr = musb_readw(epio, MUSB_RXCSR); 545 csr &= ~(MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_DMAENAB); 546 musb_writew(epio, MUSB_RXCSR, csr); 547 548 csr = musb_readw(epio, MUSB_RXCSR); 549 if (csr & MUSB_RXCSR_RXPKTRDY) { 550 csr |= MUSB_RXCSR_FLUSHFIFO; 551 musb_writew(epio, MUSB_RXCSR, csr); 552 musb_writew(epio, MUSB_RXCSR, csr); 553 } 554 } 555 556 tdbit = 1 << cppi41_channel->port_num; 557 if (is_tx) 558 tdbit <<= 16; 559 560 do { 561 musb_writel(musb->ctrl_base, USB_TDOWN, tdbit); 562 ret = dmaengine_terminate_all(cppi41_channel->dc); 563 } while (ret == -EAGAIN); 564 565 musb_writel(musb->ctrl_base, USB_TDOWN, tdbit); 566 567 if (is_tx) { 568 csr = musb_readw(epio, MUSB_TXCSR); 569 if (csr & MUSB_TXCSR_TXPKTRDY) { 570 csr |= MUSB_TXCSR_FLUSHFIFO; 571 musb_writew(epio, MUSB_TXCSR, csr); 572 } 573 } 574 575 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE; 576 return 0; 577 } 578 579 static void cppi41_release_all_dma_chans(struct cppi41_dma_controller *ctrl) 580 { 581 struct dma_chan *dc; 582 int i; 583 584 for (i = 0; i < MUSB_DMA_NUM_CHANNELS; i++) { 585 dc = ctrl->tx_channel[i].dc; 586 if (dc) 587 dma_release_channel(dc); 588 dc = ctrl->rx_channel[i].dc; 589 if (dc) 590 dma_release_channel(dc); 591 } 592 } 593 594 static void cppi41_dma_controller_stop(struct cppi41_dma_controller *controller) 595 { 596 cppi41_release_all_dma_chans(controller); 597 } 598 599 static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller) 600 { 601 struct musb *musb = controller->musb; 602 struct device *dev = musb->controller; 603 struct device_node *np = dev->of_node; 604 struct cppi41_dma_channel *cppi41_channel; 605 int count; 606 int i; 607 int ret; 608 609 count = of_property_count_strings(np, "dma-names"); 610 if (count < 0) 611 return count; 612 613 for (i = 0; i < count; i++) { 614 struct dma_chan *dc; 615 struct dma_channel *musb_dma; 616 const char *str; 617 unsigned is_tx; 618 unsigned int port; 619 620 ret = of_property_read_string_index(np, "dma-names", i, &str); 621 if (ret) 622 goto err; 623 if (!strncmp(str, "tx", 2)) 624 is_tx = 1; 625 else if (!strncmp(str, "rx", 2)) 626 is_tx = 0; 627 else { 628 dev_err(dev, "Wrong dmatype %s\n", str); 629 goto err; 630 } 631 ret = kstrtouint(str + 2, 0, &port); 632 if (ret) 633 goto err; 634 635 ret = -EINVAL; 636 if (port > MUSB_DMA_NUM_CHANNELS || !port) 637 goto err; 638 if (is_tx) 639 cppi41_channel = &controller->tx_channel[port - 1]; 640 else 641 cppi41_channel = &controller->rx_channel[port - 1]; 642 643 cppi41_channel->controller = controller; 644 cppi41_channel->port_num = port; 645 cppi41_channel->is_tx = is_tx; 646 INIT_LIST_HEAD(&cppi41_channel->tx_check); 647 648 musb_dma = &cppi41_channel->channel; 649 musb_dma->private_data = cppi41_channel; 650 musb_dma->status = MUSB_DMA_STATUS_FREE; 651 musb_dma->max_len = SZ_4M; 652 653 dc = dma_request_slave_channel(dev, str); 654 if (!dc) { 655 dev_err(dev, "Failed to request %s.\n", str); 656 ret = -EPROBE_DEFER; 657 goto err; 658 } 659 cppi41_channel->dc = dc; 660 } 661 return 0; 662 err: 663 cppi41_release_all_dma_chans(controller); 664 return ret; 665 } 666 667 void dma_controller_destroy(struct dma_controller *c) 668 { 669 struct cppi41_dma_controller *controller = container_of(c, 670 struct cppi41_dma_controller, controller); 671 672 hrtimer_cancel(&controller->early_tx); 673 cppi41_dma_controller_stop(controller); 674 kfree(controller); 675 } 676 677 struct dma_controller *dma_controller_create(struct musb *musb, 678 void __iomem *base) 679 { 680 struct cppi41_dma_controller *controller; 681 int ret = 0; 682 683 if (!musb->controller->of_node) { 684 dev_err(musb->controller, "Need DT for the DMA engine.\n"); 685 return NULL; 686 } 687 688 controller = kzalloc(sizeof(*controller), GFP_KERNEL); 689 if (!controller) 690 goto kzalloc_fail; 691 692 hrtimer_init(&controller->early_tx, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 693 controller->early_tx.function = cppi41_recheck_tx_req; 694 INIT_LIST_HEAD(&controller->early_tx_list); 695 controller->musb = musb; 696 697 controller->controller.channel_alloc = cppi41_dma_channel_allocate; 698 controller->controller.channel_release = cppi41_dma_channel_release; 699 controller->controller.channel_program = cppi41_dma_channel_program; 700 controller->controller.channel_abort = cppi41_dma_channel_abort; 701 controller->controller.is_compatible = cppi41_is_compatible; 702 703 ret = cppi41_dma_controller_start(controller); 704 if (ret) 705 goto plat_get_fail; 706 return &controller->controller; 707 708 plat_get_fail: 709 kfree(controller); 710 kzalloc_fail: 711 if (ret == -EPROBE_DEFER) 712 return ERR_PTR(ret); 713 return NULL; 714 } 715