1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/device.h> 3 #include <linux/dma-mapping.h> 4 #include <linux/dmaengine.h> 5 #include <linux/sizes.h> 6 #include <linux/platform_device.h> 7 #include <linux/of.h> 8 9 #include "cppi_dma.h" 10 #include "musb_core.h" 11 #include "musb_trace.h" 12 13 #define RNDIS_REG(x) (0x80 + ((x - 1) * 4)) 14 15 #define EP_MODE_AUTOREQ_NONE 0 16 #define EP_MODE_AUTOREQ_ALL_NEOP 1 17 #define EP_MODE_AUTOREQ_ALWAYS 3 18 19 #define EP_MODE_DMA_TRANSPARENT 0 20 #define EP_MODE_DMA_RNDIS 1 21 #define EP_MODE_DMA_GEN_RNDIS 3 22 23 #define USB_CTRL_TX_MODE 0x70 24 #define USB_CTRL_RX_MODE 0x74 25 #define USB_CTRL_AUTOREQ 0xd0 26 #define USB_TDOWN 0xd8 27 28 #define MUSB_DMA_NUM_CHANNELS 15 29 30 #define DA8XX_USB_MODE 0x10 31 #define DA8XX_USB_AUTOREQ 0x14 32 #define DA8XX_USB_TEARDOWN 0x1c 33 34 #define DA8XX_DMA_NUM_CHANNELS 4 35 36 struct cppi41_dma_controller { 37 struct dma_controller controller; 38 struct cppi41_dma_channel *rx_channel; 39 struct cppi41_dma_channel *tx_channel; 40 struct hrtimer early_tx; 41 struct list_head early_tx_list; 42 u32 rx_mode; 43 u32 tx_mode; 44 u32 auto_req; 45 46 u32 tdown_reg; 47 u32 autoreq_reg; 48 49 void (*set_dma_mode)(struct cppi41_dma_channel *cppi41_channel, 50 unsigned int mode); 51 u8 num_channels; 52 }; 53 54 static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel) 55 { 56 u16 csr; 57 u8 toggle; 58 59 if (cppi41_channel->is_tx) 60 return; 61 if (!is_host_active(cppi41_channel->controller->controller.musb)) 62 return; 63 64 csr = musb_readw(cppi41_channel->hw_ep->regs, MUSB_RXCSR); 65 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0; 66 67 cppi41_channel->usb_toggle = toggle; 68 } 69 70 static void update_rx_toggle(struct cppi41_dma_channel *cppi41_channel) 71 { 72 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 73 struct musb *musb = hw_ep->musb; 74 u16 csr; 75 u8 toggle; 76 77 if (cppi41_channel->is_tx) 78 return; 79 if (!is_host_active(musb)) 80 return; 81 82 musb_ep_select(musb->mregs, hw_ep->epnum); 83 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 84 toggle = csr & MUSB_RXCSR_H_DATATOGGLE ? 1 : 0; 85 86 /* 87 * AM335x Advisory 1.0.13: Due to internal synchronisation error the 88 * data toggle may reset from DATA1 to DATA0 during receiving data from 89 * more than one endpoint. 90 */ 91 if (!toggle && toggle == cppi41_channel->usb_toggle) { 92 csr |= MUSB_RXCSR_H_DATATOGGLE | MUSB_RXCSR_H_WR_DATATOGGLE; 93 musb_writew(cppi41_channel->hw_ep->regs, MUSB_RXCSR, csr); 94 musb_dbg(musb, "Restoring DATA1 toggle."); 95 } 96 97 cppi41_channel->usb_toggle = toggle; 98 } 99 100 static bool musb_is_tx_fifo_empty(struct musb_hw_ep *hw_ep) 101 { 102 u8 epnum = hw_ep->epnum; 103 struct musb *musb = hw_ep->musb; 104 void __iomem *epio = musb->endpoints[epnum].regs; 105 u16 csr; 106 107 musb_ep_select(musb->mregs, hw_ep->epnum); 108 csr = musb_readw(epio, MUSB_TXCSR); 109 if (csr & MUSB_TXCSR_TXPKTRDY) 110 return false; 111 return true; 112 } 113 114 static void cppi41_dma_callback(void *private_data, 115 const struct dmaengine_result *result); 116 117 static void cppi41_trans_done(struct cppi41_dma_channel *cppi41_channel) 118 { 119 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 120 struct musb *musb = hw_ep->musb; 121 void __iomem *epio = hw_ep->regs; 122 u16 csr; 123 124 if (!cppi41_channel->prog_len || 125 (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE)) { 126 127 /* done, complete */ 128 cppi41_channel->channel.actual_len = 129 cppi41_channel->transferred; 130 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE; 131 cppi41_channel->channel.rx_packet_done = true; 132 133 /* 134 * transmit ZLP using PIO mode for transfers which size is 135 * multiple of EP packet size. 136 */ 137 if (cppi41_channel->tx_zlp && (cppi41_channel->transferred % 138 cppi41_channel->packet_sz) == 0) { 139 musb_ep_select(musb->mregs, hw_ep->epnum); 140 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY; 141 musb_writew(epio, MUSB_TXCSR, csr); 142 } 143 144 trace_musb_cppi41_done(cppi41_channel); 145 musb_dma_completion(musb, hw_ep->epnum, cppi41_channel->is_tx); 146 } else { 147 /* next iteration, reload */ 148 struct dma_chan *dc = cppi41_channel->dc; 149 struct dma_async_tx_descriptor *dma_desc; 150 enum dma_transfer_direction direction; 151 u32 remain_bytes; 152 153 cppi41_channel->buf_addr += cppi41_channel->packet_sz; 154 155 remain_bytes = cppi41_channel->total_len; 156 remain_bytes -= cppi41_channel->transferred; 157 remain_bytes = min(remain_bytes, cppi41_channel->packet_sz); 158 cppi41_channel->prog_len = remain_bytes; 159 160 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV 161 : DMA_DEV_TO_MEM; 162 dma_desc = dmaengine_prep_slave_single(dc, 163 cppi41_channel->buf_addr, 164 remain_bytes, 165 direction, 166 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 167 if (WARN_ON(!dma_desc)) 168 return; 169 170 dma_desc->callback_result = cppi41_dma_callback; 171 dma_desc->callback_param = &cppi41_channel->channel; 172 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc); 173 trace_musb_cppi41_cont(cppi41_channel); 174 dma_async_issue_pending(dc); 175 176 if (!cppi41_channel->is_tx) { 177 musb_ep_select(musb->mregs, hw_ep->epnum); 178 csr = musb_readw(epio, MUSB_RXCSR); 179 csr |= MUSB_RXCSR_H_REQPKT; 180 musb_writew(epio, MUSB_RXCSR, csr); 181 } 182 } 183 } 184 185 static enum hrtimer_restart cppi41_recheck_tx_req(struct hrtimer *timer) 186 { 187 struct cppi41_dma_controller *controller; 188 struct cppi41_dma_channel *cppi41_channel, *n; 189 struct musb *musb; 190 unsigned long flags; 191 enum hrtimer_restart ret = HRTIMER_NORESTART; 192 193 controller = container_of(timer, struct cppi41_dma_controller, 194 early_tx); 195 musb = controller->controller.musb; 196 197 spin_lock_irqsave(&musb->lock, flags); 198 list_for_each_entry_safe(cppi41_channel, n, &controller->early_tx_list, 199 tx_check) { 200 bool empty; 201 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 202 203 empty = musb_is_tx_fifo_empty(hw_ep); 204 if (empty) { 205 list_del_init(&cppi41_channel->tx_check); 206 cppi41_trans_done(cppi41_channel); 207 } 208 } 209 210 if (!list_empty(&controller->early_tx_list) && 211 !hrtimer_is_queued(&controller->early_tx)) { 212 ret = HRTIMER_RESTART; 213 hrtimer_forward_now(&controller->early_tx, 20 * NSEC_PER_USEC); 214 } 215 216 spin_unlock_irqrestore(&musb->lock, flags); 217 return ret; 218 } 219 220 static void cppi41_dma_callback(void *private_data, 221 const struct dmaengine_result *result) 222 { 223 struct dma_channel *channel = private_data; 224 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 225 struct musb_hw_ep *hw_ep = cppi41_channel->hw_ep; 226 struct cppi41_dma_controller *controller; 227 struct musb *musb = hw_ep->musb; 228 unsigned long flags; 229 struct dma_tx_state txstate; 230 u32 transferred; 231 int is_hs = 0; 232 bool empty; 233 234 controller = cppi41_channel->controller; 235 if (controller->controller.dma_callback) 236 controller->controller.dma_callback(&controller->controller); 237 238 if (result->result == DMA_TRANS_ABORTED) 239 return; 240 241 spin_lock_irqsave(&musb->lock, flags); 242 243 dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie, 244 &txstate); 245 transferred = cppi41_channel->prog_len - txstate.residue; 246 cppi41_channel->transferred += transferred; 247 248 trace_musb_cppi41_gb(cppi41_channel); 249 update_rx_toggle(cppi41_channel); 250 251 if (cppi41_channel->transferred == cppi41_channel->total_len || 252 transferred < cppi41_channel->packet_sz) 253 cppi41_channel->prog_len = 0; 254 255 if (cppi41_channel->is_tx) { 256 u8 type; 257 258 if (is_host_active(musb)) 259 type = hw_ep->out_qh->type; 260 else 261 type = hw_ep->ep_in.type; 262 263 if (type == USB_ENDPOINT_XFER_ISOC) 264 /* 265 * Don't use the early-TX-interrupt workaround below 266 * for Isoch transfter. Since Isoch are periodic 267 * transfer, by the time the next transfer is 268 * scheduled, the current one should be done already. 269 * 270 * This avoids audio playback underrun issue. 271 */ 272 empty = true; 273 else 274 empty = musb_is_tx_fifo_empty(hw_ep); 275 } 276 277 if (!cppi41_channel->is_tx || empty) { 278 cppi41_trans_done(cppi41_channel); 279 goto out; 280 } 281 282 /* 283 * On AM335x it has been observed that the TX interrupt fires 284 * too early that means the TXFIFO is not yet empty but the DMA 285 * engine says that it is done with the transfer. We don't 286 * receive a FIFO empty interrupt so the only thing we can do is 287 * to poll for the bit. On HS it usually takes 2us, on FS around 288 * 110us - 150us depending on the transfer size. 289 * We spin on HS (no longer than than 25us and setup a timer on 290 * FS to check for the bit and complete the transfer. 291 */ 292 if (is_host_active(musb)) { 293 if (musb->port1_status & USB_PORT_STAT_HIGH_SPEED) 294 is_hs = 1; 295 } else { 296 if (musb->g.speed == USB_SPEED_HIGH) 297 is_hs = 1; 298 } 299 if (is_hs) { 300 unsigned wait = 25; 301 302 do { 303 empty = musb_is_tx_fifo_empty(hw_ep); 304 if (empty) { 305 cppi41_trans_done(cppi41_channel); 306 goto out; 307 } 308 wait--; 309 if (!wait) 310 break; 311 cpu_relax(); 312 } while (1); 313 } 314 list_add_tail(&cppi41_channel->tx_check, 315 &controller->early_tx_list); 316 if (!hrtimer_is_queued(&controller->early_tx)) { 317 unsigned long usecs = cppi41_channel->total_len / 10; 318 319 hrtimer_start_range_ns(&controller->early_tx, 320 usecs * NSEC_PER_USEC, 321 20 * NSEC_PER_USEC, 322 HRTIMER_MODE_REL); 323 } 324 325 out: 326 spin_unlock_irqrestore(&musb->lock, flags); 327 } 328 329 static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old) 330 { 331 unsigned shift; 332 333 shift = (ep - 1) * 2; 334 old &= ~(3 << shift); 335 old |= mode << shift; 336 return old; 337 } 338 339 static void cppi41_set_dma_mode(struct cppi41_dma_channel *cppi41_channel, 340 unsigned mode) 341 { 342 struct cppi41_dma_controller *controller = cppi41_channel->controller; 343 struct musb *musb = controller->controller.musb; 344 u32 port; 345 u32 new_mode; 346 u32 old_mode; 347 348 if (cppi41_channel->is_tx) 349 old_mode = controller->tx_mode; 350 else 351 old_mode = controller->rx_mode; 352 port = cppi41_channel->port_num; 353 new_mode = update_ep_mode(port, mode, old_mode); 354 355 if (new_mode == old_mode) 356 return; 357 if (cppi41_channel->is_tx) { 358 controller->tx_mode = new_mode; 359 musb_writel(musb->ctrl_base, USB_CTRL_TX_MODE, new_mode); 360 } else { 361 controller->rx_mode = new_mode; 362 musb_writel(musb->ctrl_base, USB_CTRL_RX_MODE, new_mode); 363 } 364 } 365 366 static void da8xx_set_dma_mode(struct cppi41_dma_channel *cppi41_channel, 367 unsigned int mode) 368 { 369 struct cppi41_dma_controller *controller = cppi41_channel->controller; 370 struct musb *musb = controller->controller.musb; 371 unsigned int shift; 372 u32 port; 373 u32 new_mode; 374 u32 old_mode; 375 376 old_mode = controller->tx_mode; 377 port = cppi41_channel->port_num; 378 379 shift = (port - 1) * 4; 380 if (!cppi41_channel->is_tx) 381 shift += 16; 382 new_mode = old_mode & ~(3 << shift); 383 new_mode |= mode << shift; 384 385 if (new_mode == old_mode) 386 return; 387 controller->tx_mode = new_mode; 388 musb_writel(musb->ctrl_base, DA8XX_USB_MODE, new_mode); 389 } 390 391 392 static void cppi41_set_autoreq_mode(struct cppi41_dma_channel *cppi41_channel, 393 unsigned mode) 394 { 395 struct cppi41_dma_controller *controller = cppi41_channel->controller; 396 u32 port; 397 u32 new_mode; 398 u32 old_mode; 399 400 old_mode = controller->auto_req; 401 port = cppi41_channel->port_num; 402 new_mode = update_ep_mode(port, mode, old_mode); 403 404 if (new_mode == old_mode) 405 return; 406 controller->auto_req = new_mode; 407 musb_writel(controller->controller.musb->ctrl_base, 408 controller->autoreq_reg, new_mode); 409 } 410 411 static bool cppi41_configure_channel(struct dma_channel *channel, 412 u16 packet_sz, u8 mode, 413 dma_addr_t dma_addr, u32 len) 414 { 415 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 416 struct cppi41_dma_controller *controller = cppi41_channel->controller; 417 struct dma_chan *dc = cppi41_channel->dc; 418 struct dma_async_tx_descriptor *dma_desc; 419 enum dma_transfer_direction direction; 420 struct musb *musb = cppi41_channel->controller->controller.musb; 421 unsigned use_gen_rndis = 0; 422 423 cppi41_channel->buf_addr = dma_addr; 424 cppi41_channel->total_len = len; 425 cppi41_channel->transferred = 0; 426 cppi41_channel->packet_sz = packet_sz; 427 cppi41_channel->tx_zlp = (cppi41_channel->is_tx && mode) ? 1 : 0; 428 429 /* 430 * Due to AM335x' Advisory 1.0.13 we are not allowed to transfer more 431 * than max packet size at a time. 432 */ 433 if (cppi41_channel->is_tx) 434 use_gen_rndis = 1; 435 436 if (use_gen_rndis) { 437 /* RNDIS mode */ 438 if (len > packet_sz) { 439 musb_writel(musb->ctrl_base, 440 RNDIS_REG(cppi41_channel->port_num), len); 441 /* gen rndis */ 442 controller->set_dma_mode(cppi41_channel, 443 EP_MODE_DMA_GEN_RNDIS); 444 445 /* auto req */ 446 cppi41_set_autoreq_mode(cppi41_channel, 447 EP_MODE_AUTOREQ_ALL_NEOP); 448 } else { 449 musb_writel(musb->ctrl_base, 450 RNDIS_REG(cppi41_channel->port_num), 0); 451 controller->set_dma_mode(cppi41_channel, 452 EP_MODE_DMA_TRANSPARENT); 453 cppi41_set_autoreq_mode(cppi41_channel, 454 EP_MODE_AUTOREQ_NONE); 455 } 456 } else { 457 /* fallback mode */ 458 controller->set_dma_mode(cppi41_channel, 459 EP_MODE_DMA_TRANSPARENT); 460 cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREQ_NONE); 461 len = min_t(u32, packet_sz, len); 462 } 463 cppi41_channel->prog_len = len; 464 direction = cppi41_channel->is_tx ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; 465 dma_desc = dmaengine_prep_slave_single(dc, dma_addr, len, direction, 466 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 467 if (!dma_desc) 468 return false; 469 470 dma_desc->callback_result = cppi41_dma_callback; 471 dma_desc->callback_param = channel; 472 cppi41_channel->cookie = dma_desc->tx_submit(dma_desc); 473 cppi41_channel->channel.rx_packet_done = false; 474 475 trace_musb_cppi41_config(cppi41_channel); 476 477 save_rx_toggle(cppi41_channel); 478 dma_async_issue_pending(dc); 479 return true; 480 } 481 482 static struct dma_channel *cppi41_dma_channel_allocate(struct dma_controller *c, 483 struct musb_hw_ep *hw_ep, u8 is_tx) 484 { 485 struct cppi41_dma_controller *controller = container_of(c, 486 struct cppi41_dma_controller, controller); 487 struct cppi41_dma_channel *cppi41_channel = NULL; 488 u8 ch_num = hw_ep->epnum - 1; 489 490 if (ch_num >= controller->num_channels) 491 return NULL; 492 493 if (is_tx) 494 cppi41_channel = &controller->tx_channel[ch_num]; 495 else 496 cppi41_channel = &controller->rx_channel[ch_num]; 497 498 if (!cppi41_channel->dc) 499 return NULL; 500 501 if (cppi41_channel->is_allocated) 502 return NULL; 503 504 cppi41_channel->hw_ep = hw_ep; 505 cppi41_channel->is_allocated = 1; 506 507 trace_musb_cppi41_alloc(cppi41_channel); 508 return &cppi41_channel->channel; 509 } 510 511 static void cppi41_dma_channel_release(struct dma_channel *channel) 512 { 513 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 514 515 trace_musb_cppi41_free(cppi41_channel); 516 if (cppi41_channel->is_allocated) { 517 cppi41_channel->is_allocated = 0; 518 channel->status = MUSB_DMA_STATUS_FREE; 519 channel->actual_len = 0; 520 } 521 } 522 523 static int cppi41_dma_channel_program(struct dma_channel *channel, 524 u16 packet_sz, u8 mode, 525 dma_addr_t dma_addr, u32 len) 526 { 527 int ret; 528 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 529 int hb_mult = 0; 530 531 BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN || 532 channel->status == MUSB_DMA_STATUS_BUSY); 533 534 if (is_host_active(cppi41_channel->controller->controller.musb)) { 535 if (cppi41_channel->is_tx) 536 hb_mult = cppi41_channel->hw_ep->out_qh->hb_mult; 537 else 538 hb_mult = cppi41_channel->hw_ep->in_qh->hb_mult; 539 } 540 541 channel->status = MUSB_DMA_STATUS_BUSY; 542 channel->actual_len = 0; 543 544 if (hb_mult) 545 packet_sz = hb_mult * (packet_sz & 0x7FF); 546 547 ret = cppi41_configure_channel(channel, packet_sz, mode, dma_addr, len); 548 if (!ret) 549 channel->status = MUSB_DMA_STATUS_FREE; 550 551 return ret; 552 } 553 554 static int cppi41_is_compatible(struct dma_channel *channel, u16 maxpacket, 555 void *buf, u32 length) 556 { 557 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 558 struct cppi41_dma_controller *controller = cppi41_channel->controller; 559 struct musb *musb = controller->controller.musb; 560 561 if (is_host_active(musb)) { 562 WARN_ON(1); 563 return 1; 564 } 565 if (cppi41_channel->hw_ep->ep_in.type != USB_ENDPOINT_XFER_BULK) 566 return 0; 567 if (cppi41_channel->is_tx) 568 return 1; 569 /* AM335x Advisory 1.0.13. No workaround for device RX mode */ 570 return 0; 571 } 572 573 static int cppi41_dma_channel_abort(struct dma_channel *channel) 574 { 575 struct cppi41_dma_channel *cppi41_channel = channel->private_data; 576 struct cppi41_dma_controller *controller = cppi41_channel->controller; 577 struct musb *musb = controller->controller.musb; 578 void __iomem *epio = cppi41_channel->hw_ep->regs; 579 int tdbit; 580 int ret; 581 unsigned is_tx; 582 u16 csr; 583 584 is_tx = cppi41_channel->is_tx; 585 trace_musb_cppi41_abort(cppi41_channel); 586 587 if (cppi41_channel->channel.status == MUSB_DMA_STATUS_FREE) 588 return 0; 589 590 list_del_init(&cppi41_channel->tx_check); 591 if (is_tx) { 592 csr = musb_readw(epio, MUSB_TXCSR); 593 csr &= ~MUSB_TXCSR_DMAENAB; 594 musb_writew(epio, MUSB_TXCSR, csr); 595 } else { 596 cppi41_set_autoreq_mode(cppi41_channel, EP_MODE_AUTOREQ_NONE); 597 598 /* delay to drain to cppi dma pipeline for isoch */ 599 udelay(250); 600 601 csr = musb_readw(epio, MUSB_RXCSR); 602 csr &= ~(MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_DMAENAB); 603 musb_writew(epio, MUSB_RXCSR, csr); 604 605 /* wait to drain cppi dma pipe line */ 606 udelay(50); 607 608 csr = musb_readw(epio, MUSB_RXCSR); 609 if (csr & MUSB_RXCSR_RXPKTRDY) { 610 csr |= MUSB_RXCSR_FLUSHFIFO; 611 musb_writew(epio, MUSB_RXCSR, csr); 612 musb_writew(epio, MUSB_RXCSR, csr); 613 } 614 } 615 616 /* DA8xx Advisory 2.3.27: wait 250 ms before to start the teardown */ 617 if (musb->ops->quirks & MUSB_DA8XX) 618 mdelay(250); 619 620 tdbit = 1 << cppi41_channel->port_num; 621 if (is_tx) 622 tdbit <<= 16; 623 624 do { 625 if (is_tx) 626 musb_writel(musb->ctrl_base, controller->tdown_reg, 627 tdbit); 628 ret = dmaengine_terminate_all(cppi41_channel->dc); 629 } while (ret == -EAGAIN); 630 631 if (is_tx) { 632 musb_writel(musb->ctrl_base, controller->tdown_reg, tdbit); 633 634 csr = musb_readw(epio, MUSB_TXCSR); 635 if (csr & MUSB_TXCSR_TXPKTRDY) { 636 csr |= MUSB_TXCSR_FLUSHFIFO; 637 musb_writew(epio, MUSB_TXCSR, csr); 638 } 639 } 640 641 cppi41_channel->channel.status = MUSB_DMA_STATUS_FREE; 642 return 0; 643 } 644 645 static void cppi41_release_all_dma_chans(struct cppi41_dma_controller *ctrl) 646 { 647 struct dma_chan *dc; 648 int i; 649 650 for (i = 0; i < ctrl->num_channels; i++) { 651 dc = ctrl->tx_channel[i].dc; 652 if (dc) 653 dma_release_channel(dc); 654 dc = ctrl->rx_channel[i].dc; 655 if (dc) 656 dma_release_channel(dc); 657 } 658 } 659 660 static void cppi41_dma_controller_stop(struct cppi41_dma_controller *controller) 661 { 662 cppi41_release_all_dma_chans(controller); 663 } 664 665 static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller) 666 { 667 struct musb *musb = controller->controller.musb; 668 struct device *dev = musb->controller; 669 struct device_node *np = dev->parent->of_node; 670 struct cppi41_dma_channel *cppi41_channel; 671 int count; 672 int i; 673 int ret; 674 675 count = of_property_count_strings(np, "dma-names"); 676 if (count < 0) 677 return count; 678 679 for (i = 0; i < count; i++) { 680 struct dma_chan *dc; 681 struct dma_channel *musb_dma; 682 const char *str; 683 unsigned is_tx; 684 unsigned int port; 685 686 ret = of_property_read_string_index(np, "dma-names", i, &str); 687 if (ret) 688 goto err; 689 if (strstarts(str, "tx")) 690 is_tx = 1; 691 else if (strstarts(str, "rx")) 692 is_tx = 0; 693 else { 694 dev_err(dev, "Wrong dmatype %s\n", str); 695 goto err; 696 } 697 ret = kstrtouint(str + 2, 0, &port); 698 if (ret) 699 goto err; 700 701 ret = -EINVAL; 702 if (port > controller->num_channels || !port) 703 goto err; 704 if (is_tx) 705 cppi41_channel = &controller->tx_channel[port - 1]; 706 else 707 cppi41_channel = &controller->rx_channel[port - 1]; 708 709 cppi41_channel->controller = controller; 710 cppi41_channel->port_num = port; 711 cppi41_channel->is_tx = is_tx; 712 INIT_LIST_HEAD(&cppi41_channel->tx_check); 713 714 musb_dma = &cppi41_channel->channel; 715 musb_dma->private_data = cppi41_channel; 716 musb_dma->status = MUSB_DMA_STATUS_FREE; 717 musb_dma->max_len = SZ_4M; 718 719 dc = dma_request_chan(dev->parent, str); 720 if (IS_ERR(dc)) { 721 ret = PTR_ERR(dc); 722 if (ret != -EPROBE_DEFER) 723 dev_err(dev, "Failed to request %s: %d.\n", 724 str, ret); 725 goto err; 726 } 727 728 cppi41_channel->dc = dc; 729 } 730 return 0; 731 err: 732 cppi41_release_all_dma_chans(controller); 733 return ret; 734 } 735 736 void cppi41_dma_controller_destroy(struct dma_controller *c) 737 { 738 struct cppi41_dma_controller *controller = container_of(c, 739 struct cppi41_dma_controller, controller); 740 741 hrtimer_cancel(&controller->early_tx); 742 cppi41_dma_controller_stop(controller); 743 kfree(controller->rx_channel); 744 kfree(controller->tx_channel); 745 kfree(controller); 746 } 747 EXPORT_SYMBOL_GPL(cppi41_dma_controller_destroy); 748 749 struct dma_controller * 750 cppi41_dma_controller_create(struct musb *musb, void __iomem *base) 751 { 752 struct cppi41_dma_controller *controller; 753 int channel_size; 754 int ret = 0; 755 756 if (!musb->controller->parent->of_node) { 757 dev_err(musb->controller, "Need DT for the DMA engine.\n"); 758 return NULL; 759 } 760 761 controller = kzalloc(sizeof(*controller), GFP_KERNEL); 762 if (!controller) 763 goto kzalloc_fail; 764 765 hrtimer_init(&controller->early_tx, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 766 controller->early_tx.function = cppi41_recheck_tx_req; 767 INIT_LIST_HEAD(&controller->early_tx_list); 768 769 controller->controller.channel_alloc = cppi41_dma_channel_allocate; 770 controller->controller.channel_release = cppi41_dma_channel_release; 771 controller->controller.channel_program = cppi41_dma_channel_program; 772 controller->controller.channel_abort = cppi41_dma_channel_abort; 773 controller->controller.is_compatible = cppi41_is_compatible; 774 controller->controller.musb = musb; 775 776 if (musb->ops->quirks & MUSB_DA8XX) { 777 controller->tdown_reg = DA8XX_USB_TEARDOWN; 778 controller->autoreq_reg = DA8XX_USB_AUTOREQ; 779 controller->set_dma_mode = da8xx_set_dma_mode; 780 controller->num_channels = DA8XX_DMA_NUM_CHANNELS; 781 } else { 782 controller->tdown_reg = USB_TDOWN; 783 controller->autoreq_reg = USB_CTRL_AUTOREQ; 784 controller->set_dma_mode = cppi41_set_dma_mode; 785 controller->num_channels = MUSB_DMA_NUM_CHANNELS; 786 } 787 788 channel_size = controller->num_channels * 789 sizeof(struct cppi41_dma_channel); 790 controller->rx_channel = kzalloc(channel_size, GFP_KERNEL); 791 if (!controller->rx_channel) 792 goto rx_channel_alloc_fail; 793 controller->tx_channel = kzalloc(channel_size, GFP_KERNEL); 794 if (!controller->tx_channel) 795 goto tx_channel_alloc_fail; 796 797 ret = cppi41_dma_controller_start(controller); 798 if (ret) 799 goto plat_get_fail; 800 return &controller->controller; 801 802 plat_get_fail: 803 kfree(controller->tx_channel); 804 tx_channel_alloc_fail: 805 kfree(controller->rx_channel); 806 rx_channel_alloc_fail: 807 kfree(controller); 808 kzalloc_fail: 809 if (ret == -EPROBE_DEFER) 810 return ERR_PTR(ret); 811 return NULL; 812 } 813 EXPORT_SYMBOL_GPL(cppi41_dma_controller_create); 814