1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * MUSB OTG driver host support 4 * 5 * Copyright 2005 Mentor Graphics Corporation 6 * Copyright (C) 2005-2006 by Texas Instruments 7 * Copyright (C) 2006-2007 Nokia Corporation 8 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/delay.h> 14 #include <linux/sched.h> 15 #include <linux/slab.h> 16 #include <linux/errno.h> 17 #include <linux/list.h> 18 #include <linux/dma-mapping.h> 19 20 #include "musb_core.h" 21 #include "musb_host.h" 22 #include "musb_trace.h" 23 24 /* MUSB HOST status 22-mar-2006 25 * 26 * - There's still lots of partial code duplication for fault paths, so 27 * they aren't handled as consistently as they need to be. 28 * 29 * - PIO mostly behaved when last tested. 30 * + including ep0, with all usbtest cases 9, 10 31 * + usbtest 14 (ep0out) doesn't seem to run at all 32 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest 33 * configurations, but otherwise double buffering passes basic tests. 34 * + for 2.6.N, for N > ~10, needs API changes for hcd framework. 35 * 36 * - DMA (CPPI) ... partially behaves, not currently recommended 37 * + about 1/15 the speed of typical EHCI implementations (PCI) 38 * + RX, all too often reqpkt seems to misbehave after tx 39 * + TX, no known issues (other than evident silicon issue) 40 * 41 * - DMA (Mentor/OMAP) ...has at least toggle update problems 42 * 43 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet 44 * starvation ... nothing yet for TX, interrupt, or bulk. 45 * 46 * - Not tested with HNP, but some SRP paths seem to behave. 47 * 48 * NOTE 24-August-2006: 49 * 50 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an 51 * extra endpoint for periodic use enabling hub + keybd + mouse. That 52 * mostly works, except that with "usbnet" it's easy to trigger cases 53 * with "ping" where RX loses. (a) ping to davinci, even "ping -f", 54 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses 55 * although ARP RX wins. (That test was done with a full speed link.) 56 */ 57 58 59 /* 60 * NOTE on endpoint usage: 61 * 62 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN 63 * and OUT endpoints ... hardware is dedicated for those "async" queue(s). 64 * (Yes, bulk _could_ use more of the endpoints than that, and would even 65 * benefit from it.) 66 * 67 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. 68 * So far that scheduling is both dumb and optimistic: the endpoint will be 69 * "claimed" until its software queue is no longer refilled. No multiplexing 70 * of transfers between endpoints, or anything clever. 71 */ 72 73 struct musb *hcd_to_musb(struct usb_hcd *hcd) 74 { 75 return *(struct musb **) hcd->hcd_priv; 76 } 77 78 79 static void musb_ep_program(struct musb *musb, u8 epnum, 80 struct urb *urb, int is_out, 81 u8 *buf, u32 offset, u32 len); 82 83 /* 84 * Clear TX fifo. Needed to avoid BABBLE errors. 85 */ 86 static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) 87 { 88 struct musb *musb = ep->musb; 89 void __iomem *epio = ep->regs; 90 u16 csr; 91 int retries = 1000; 92 93 csr = musb_readw(epio, MUSB_TXCSR); 94 while (csr & MUSB_TXCSR_FIFONOTEMPTY) { 95 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_TXPKTRDY; 96 musb_writew(epio, MUSB_TXCSR, csr); 97 csr = musb_readw(epio, MUSB_TXCSR); 98 99 /* 100 * FIXME: sometimes the tx fifo flush failed, it has been 101 * observed during device disconnect on AM335x. 102 * 103 * To reproduce the issue, ensure tx urb(s) are queued when 104 * unplug the usb device which is connected to AM335x usb 105 * host port. 106 * 107 * I found using a usb-ethernet device and running iperf 108 * (client on AM335x) has very high chance to trigger it. 109 * 110 * Better to turn on musb_dbg() in musb_cleanup_urb() with 111 * CPPI enabled to see the issue when aborting the tx channel. 112 */ 113 if (dev_WARN_ONCE(musb->controller, retries-- < 1, 114 "Could not flush host TX%d fifo: csr: %04x\n", 115 ep->epnum, csr)) 116 return; 117 mdelay(1); 118 } 119 } 120 121 static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) 122 { 123 void __iomem *epio = ep->regs; 124 u16 csr; 125 int retries = 5; 126 127 /* scrub any data left in the fifo */ 128 do { 129 csr = musb_readw(epio, MUSB_TXCSR); 130 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) 131 break; 132 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); 133 csr = musb_readw(epio, MUSB_TXCSR); 134 udelay(10); 135 } while (--retries); 136 137 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", 138 ep->epnum, csr); 139 140 /* and reset for the next transfer */ 141 musb_writew(epio, MUSB_TXCSR, 0); 142 } 143 144 /* 145 * Start transmit. Caller is responsible for locking shared resources. 146 * musb must be locked. 147 */ 148 static inline void musb_h_tx_start(struct musb_hw_ep *ep) 149 { 150 u16 txcsr; 151 152 /* NOTE: no locks here; caller should lock and select EP */ 153 if (ep->epnum) { 154 txcsr = musb_readw(ep->regs, MUSB_TXCSR); 155 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; 156 musb_writew(ep->regs, MUSB_TXCSR, txcsr); 157 } else { 158 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; 159 musb_writew(ep->regs, MUSB_CSR0, txcsr); 160 } 161 162 } 163 164 static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) 165 { 166 u16 txcsr; 167 168 /* NOTE: no locks here; caller should lock and select EP */ 169 txcsr = musb_readw(ep->regs, MUSB_TXCSR); 170 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; 171 if (is_cppi_enabled(ep->musb)) 172 txcsr |= MUSB_TXCSR_DMAMODE; 173 musb_writew(ep->regs, MUSB_TXCSR, txcsr); 174 } 175 176 static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) 177 { 178 if (is_in != 0 || ep->is_shared_fifo) 179 ep->in_qh = qh; 180 if (is_in == 0 || ep->is_shared_fifo) 181 ep->out_qh = qh; 182 } 183 184 static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) 185 { 186 return is_in ? ep->in_qh : ep->out_qh; 187 } 188 189 /* 190 * Start the URB at the front of an endpoint's queue 191 * end must be claimed from the caller. 192 * 193 * Context: controller locked, irqs blocked 194 */ 195 static void 196 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) 197 { 198 u32 len; 199 void __iomem *mbase = musb->mregs; 200 struct urb *urb = next_urb(qh); 201 void *buf = urb->transfer_buffer; 202 u32 offset = 0; 203 struct musb_hw_ep *hw_ep = qh->hw_ep; 204 int epnum = hw_ep->epnum; 205 206 /* initialize software qh state */ 207 qh->offset = 0; 208 qh->segsize = 0; 209 210 /* gather right source of data */ 211 switch (qh->type) { 212 case USB_ENDPOINT_XFER_CONTROL: 213 /* control transfers always start with SETUP */ 214 is_in = 0; 215 musb->ep0_stage = MUSB_EP0_START; 216 buf = urb->setup_packet; 217 len = 8; 218 break; 219 case USB_ENDPOINT_XFER_ISOC: 220 qh->iso_idx = 0; 221 qh->frame = 0; 222 offset = urb->iso_frame_desc[0].offset; 223 len = urb->iso_frame_desc[0].length; 224 break; 225 default: /* bulk, interrupt */ 226 /* actual_length may be nonzero on retry paths */ 227 buf = urb->transfer_buffer + urb->actual_length; 228 len = urb->transfer_buffer_length - urb->actual_length; 229 } 230 231 trace_musb_urb_start(musb, urb); 232 233 /* Configure endpoint */ 234 musb_ep_set_qh(hw_ep, is_in, qh); 235 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); 236 237 /* transmit may have more work: start it when it is time */ 238 if (is_in) 239 return; 240 241 /* determine if the time is right for a periodic transfer */ 242 switch (qh->type) { 243 case USB_ENDPOINT_XFER_ISOC: 244 case USB_ENDPOINT_XFER_INT: 245 musb_dbg(musb, "check whether there's still time for periodic Tx"); 246 /* FIXME this doesn't implement that scheduling policy ... 247 * or handle framecounter wrapping 248 */ 249 if (1) { /* Always assume URB_ISO_ASAP */ 250 /* REVISIT the SOF irq handler shouldn't duplicate 251 * this code; and we don't init urb->start_frame... 252 */ 253 qh->frame = 0; 254 goto start; 255 } else { 256 qh->frame = urb->start_frame; 257 /* enable SOF interrupt so we can count down */ 258 musb_dbg(musb, "SOF for %d", epnum); 259 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */ 260 musb_writeb(mbase, MUSB_INTRUSBE, 0xff); 261 #endif 262 } 263 break; 264 default: 265 start: 266 musb_dbg(musb, "Start TX%d %s", epnum, 267 hw_ep->tx_channel ? "dma" : "pio"); 268 269 if (!hw_ep->tx_channel) 270 musb_h_tx_start(hw_ep); 271 else if (is_cppi_enabled(musb) || tusb_dma_omap(musb)) 272 musb_h_tx_dma_start(hw_ep); 273 } 274 } 275 276 /* Context: caller owns controller lock, IRQs are blocked */ 277 static void musb_giveback(struct musb *musb, struct urb *urb, int status) 278 __releases(musb->lock) 279 __acquires(musb->lock) 280 { 281 trace_musb_urb_gb(musb, urb); 282 283 usb_hcd_unlink_urb_from_ep(musb->hcd, urb); 284 spin_unlock(&musb->lock); 285 usb_hcd_giveback_urb(musb->hcd, urb, status); 286 spin_lock(&musb->lock); 287 } 288 289 /* 290 * Advance this hardware endpoint's queue, completing the specified URB and 291 * advancing to either the next URB queued to that qh, or else invalidating 292 * that qh and advancing to the next qh scheduled after the current one. 293 * 294 * Context: caller owns controller lock, IRQs are blocked 295 */ 296 static void musb_advance_schedule(struct musb *musb, struct urb *urb, 297 struct musb_hw_ep *hw_ep, int is_in) 298 { 299 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); 300 struct musb_hw_ep *ep = qh->hw_ep; 301 int ready = qh->is_ready; 302 int status; 303 u16 toggle; 304 305 status = (urb->status == -EINPROGRESS) ? 0 : urb->status; 306 307 /* save toggle eagerly, for paranoia */ 308 switch (qh->type) { 309 case USB_ENDPOINT_XFER_BULK: 310 case USB_ENDPOINT_XFER_INT: 311 toggle = musb->io.get_toggle(qh, !is_in); 312 usb_settoggle(urb->dev, qh->epnum, !is_in, toggle ? 1 : 0); 313 break; 314 case USB_ENDPOINT_XFER_ISOC: 315 if (status == 0 && urb->error_count) 316 status = -EXDEV; 317 break; 318 } 319 320 qh->is_ready = 0; 321 musb_giveback(musb, urb, status); 322 qh->is_ready = ready; 323 324 /* 325 * musb->lock had been unlocked in musb_giveback, so qh may 326 * be freed, need to get it again 327 */ 328 qh = musb_ep_get_qh(hw_ep, is_in); 329 330 /* reclaim resources (and bandwidth) ASAP; deschedule it, and 331 * invalidate qh as soon as list_empty(&hep->urb_list) 332 */ 333 if (qh && list_empty(&qh->hep->urb_list)) { 334 struct list_head *head; 335 struct dma_controller *dma = musb->dma_controller; 336 337 if (is_in) { 338 ep->rx_reinit = 1; 339 if (ep->rx_channel) { 340 dma->channel_release(ep->rx_channel); 341 ep->rx_channel = NULL; 342 } 343 } else { 344 ep->tx_reinit = 1; 345 if (ep->tx_channel) { 346 dma->channel_release(ep->tx_channel); 347 ep->tx_channel = NULL; 348 } 349 } 350 351 /* Clobber old pointers to this qh */ 352 musb_ep_set_qh(ep, is_in, NULL); 353 qh->hep->hcpriv = NULL; 354 355 switch (qh->type) { 356 357 case USB_ENDPOINT_XFER_CONTROL: 358 case USB_ENDPOINT_XFER_BULK: 359 /* fifo policy for these lists, except that NAKing 360 * should rotate a qh to the end (for fairness). 361 */ 362 if (qh->mux == 1) { 363 head = qh->ring.prev; 364 list_del(&qh->ring); 365 kfree(qh); 366 qh = first_qh(head); 367 break; 368 } 369 fallthrough; 370 371 case USB_ENDPOINT_XFER_ISOC: 372 case USB_ENDPOINT_XFER_INT: 373 /* this is where periodic bandwidth should be 374 * de-allocated if it's tracked and allocated; 375 * and where we'd update the schedule tree... 376 */ 377 kfree(qh); 378 qh = NULL; 379 break; 380 } 381 } 382 383 if (qh != NULL && qh->is_ready) { 384 musb_dbg(musb, "... next ep%d %cX urb %p", 385 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); 386 musb_start_urb(musb, is_in, qh); 387 } 388 } 389 390 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) 391 { 392 /* we don't want fifo to fill itself again; 393 * ignore dma (various models), 394 * leave toggle alone (may not have been saved yet) 395 */ 396 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; 397 csr &= ~(MUSB_RXCSR_H_REQPKT 398 | MUSB_RXCSR_H_AUTOREQ 399 | MUSB_RXCSR_AUTOCLEAR); 400 401 /* write 2x to allow double buffering */ 402 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 403 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 404 405 /* flush writebuffer */ 406 return musb_readw(hw_ep->regs, MUSB_RXCSR); 407 } 408 409 /* 410 * PIO RX for a packet (or part of it). 411 */ 412 static bool 413 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) 414 { 415 u16 rx_count; 416 u8 *buf; 417 u16 csr; 418 bool done = false; 419 u32 length; 420 int do_flush = 0; 421 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 422 void __iomem *epio = hw_ep->regs; 423 struct musb_qh *qh = hw_ep->in_qh; 424 int pipe = urb->pipe; 425 void *buffer = urb->transfer_buffer; 426 427 /* musb_ep_select(mbase, epnum); */ 428 rx_count = musb_readw(epio, MUSB_RXCOUNT); 429 musb_dbg(musb, "RX%d count %d, buffer %p len %d/%d", epnum, rx_count, 430 urb->transfer_buffer, qh->offset, 431 urb->transfer_buffer_length); 432 433 /* unload FIFO */ 434 if (usb_pipeisoc(pipe)) { 435 int status = 0; 436 struct usb_iso_packet_descriptor *d; 437 438 if (iso_err) { 439 status = -EILSEQ; 440 urb->error_count++; 441 } 442 443 d = urb->iso_frame_desc + qh->iso_idx; 444 buf = buffer + d->offset; 445 length = d->length; 446 if (rx_count > length) { 447 if (status == 0) { 448 status = -EOVERFLOW; 449 urb->error_count++; 450 } 451 musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length); 452 do_flush = 1; 453 } else 454 length = rx_count; 455 urb->actual_length += length; 456 d->actual_length = length; 457 458 d->status = status; 459 460 /* see if we are done */ 461 done = (++qh->iso_idx >= urb->number_of_packets); 462 } else { 463 /* non-isoch */ 464 buf = buffer + qh->offset; 465 length = urb->transfer_buffer_length - qh->offset; 466 if (rx_count > length) { 467 if (urb->status == -EINPROGRESS) 468 urb->status = -EOVERFLOW; 469 musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length); 470 do_flush = 1; 471 } else 472 length = rx_count; 473 urb->actual_length += length; 474 qh->offset += length; 475 476 /* see if we are done */ 477 done = (urb->actual_length == urb->transfer_buffer_length) 478 || (rx_count < qh->maxpacket) 479 || (urb->status != -EINPROGRESS); 480 if (done 481 && (urb->status == -EINPROGRESS) 482 && (urb->transfer_flags & URB_SHORT_NOT_OK) 483 && (urb->actual_length 484 < urb->transfer_buffer_length)) 485 urb->status = -EREMOTEIO; 486 } 487 488 musb_read_fifo(hw_ep, length, buf); 489 490 csr = musb_readw(epio, MUSB_RXCSR); 491 csr |= MUSB_RXCSR_H_WZC_BITS; 492 if (unlikely(do_flush)) 493 musb_h_flush_rxfifo(hw_ep, csr); 494 else { 495 /* REVISIT this assumes AUTOCLEAR is never set */ 496 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); 497 if (!done) 498 csr |= MUSB_RXCSR_H_REQPKT; 499 musb_writew(epio, MUSB_RXCSR, csr); 500 } 501 502 return done; 503 } 504 505 /* we don't always need to reinit a given side of an endpoint... 506 * when we do, use tx/rx reinit routine and then construct a new CSR 507 * to address data toggle, NYET, and DMA or PIO. 508 * 509 * it's possible that driver bugs (especially for DMA) or aborting a 510 * transfer might have left the endpoint busier than it should be. 511 * the busy/not-empty tests are basically paranoia. 512 */ 513 static void 514 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, u8 epnum) 515 { 516 struct musb_hw_ep *ep = musb->endpoints + epnum; 517 u16 csr; 518 519 /* NOTE: we know the "rx" fifo reinit never triggers for ep0. 520 * That always uses tx_reinit since ep0 repurposes TX register 521 * offsets; the initial SETUP packet is also a kind of OUT. 522 */ 523 524 /* if programmed for Tx, put it in RX mode */ 525 if (ep->is_shared_fifo) { 526 csr = musb_readw(ep->regs, MUSB_TXCSR); 527 if (csr & MUSB_TXCSR_MODE) { 528 musb_h_tx_flush_fifo(ep); 529 csr = musb_readw(ep->regs, MUSB_TXCSR); 530 musb_writew(ep->regs, MUSB_TXCSR, 531 csr | MUSB_TXCSR_FRCDATATOG); 532 } 533 534 /* 535 * Clear the MODE bit (and everything else) to enable Rx. 536 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. 537 */ 538 if (csr & MUSB_TXCSR_DMAMODE) 539 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); 540 musb_writew(ep->regs, MUSB_TXCSR, 0); 541 542 /* scrub all previous state, clearing toggle */ 543 } 544 csr = musb_readw(ep->regs, MUSB_RXCSR); 545 if (csr & MUSB_RXCSR_RXPKTRDY) 546 WARNING("rx%d, packet/%d ready?\n", ep->epnum, 547 musb_readw(ep->regs, MUSB_RXCOUNT)); 548 549 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); 550 551 /* target addr and (for multipoint) hub addr/port */ 552 if (musb->is_multipoint) { 553 musb_write_rxfunaddr(musb, epnum, qh->addr_reg); 554 musb_write_rxhubaddr(musb, epnum, qh->h_addr_reg); 555 musb_write_rxhubport(musb, epnum, qh->h_port_reg); 556 } else 557 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); 558 559 /* protocol/endpoint, interval/NAKlimit, i/o size */ 560 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); 561 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); 562 /* NOTE: bulk combining rewrites high bits of maxpacket */ 563 /* Set RXMAXP with the FIFO size of the endpoint 564 * to disable double buffer mode. 565 */ 566 musb_writew(ep->regs, MUSB_RXMAXP, 567 qh->maxpacket | ((qh->hb_mult - 1) << 11)); 568 569 ep->rx_reinit = 0; 570 } 571 572 static void musb_tx_dma_set_mode_mentor(struct musb_hw_ep *hw_ep, 573 struct musb_qh *qh, 574 u32 *length, u8 *mode) 575 { 576 struct dma_channel *channel = hw_ep->tx_channel; 577 void __iomem *epio = hw_ep->regs; 578 u16 pkt_size = qh->maxpacket; 579 u16 csr; 580 581 if (*length > channel->max_len) 582 *length = channel->max_len; 583 584 csr = musb_readw(epio, MUSB_TXCSR); 585 if (*length > pkt_size) { 586 *mode = 1; 587 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; 588 /* autoset shouldn't be set in high bandwidth */ 589 /* 590 * Enable Autoset according to table 591 * below 592 * bulk_split hb_mult Autoset_Enable 593 * 0 1 Yes(Normal) 594 * 0 >1 No(High BW ISO) 595 * 1 1 Yes(HS bulk) 596 * 1 >1 Yes(FS bulk) 597 */ 598 if (qh->hb_mult == 1 || (qh->hb_mult > 1 && 599 can_bulk_split(hw_ep->musb, qh->type))) 600 csr |= MUSB_TXCSR_AUTOSET; 601 } else { 602 *mode = 0; 603 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); 604 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ 605 } 606 channel->desired_mode = *mode; 607 musb_writew(epio, MUSB_TXCSR, csr); 608 } 609 610 static void musb_tx_dma_set_mode_cppi_tusb(struct musb_hw_ep *hw_ep, 611 struct urb *urb, 612 u8 *mode) 613 { 614 struct dma_channel *channel = hw_ep->tx_channel; 615 616 channel->actual_len = 0; 617 618 /* 619 * TX uses "RNDIS" mode automatically but needs help 620 * to identify the zero-length-final-packet case. 621 */ 622 *mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; 623 } 624 625 static bool musb_tx_dma_program(struct dma_controller *dma, 626 struct musb_hw_ep *hw_ep, struct musb_qh *qh, 627 struct urb *urb, u32 offset, u32 length) 628 { 629 struct dma_channel *channel = hw_ep->tx_channel; 630 u16 pkt_size = qh->maxpacket; 631 u8 mode; 632 633 if (musb_dma_inventra(hw_ep->musb) || musb_dma_ux500(hw_ep->musb)) 634 musb_tx_dma_set_mode_mentor(hw_ep, qh, 635 &length, &mode); 636 else if (is_cppi_enabled(hw_ep->musb) || tusb_dma_omap(hw_ep->musb)) 637 musb_tx_dma_set_mode_cppi_tusb(hw_ep, urb, &mode); 638 else 639 return false; 640 641 qh->segsize = length; 642 643 /* 644 * Ensure the data reaches to main memory before starting 645 * DMA transfer 646 */ 647 wmb(); 648 649 if (!dma->channel_program(channel, pkt_size, mode, 650 urb->transfer_dma + offset, length)) { 651 void __iomem *epio = hw_ep->regs; 652 u16 csr; 653 654 dma->channel_release(channel); 655 hw_ep->tx_channel = NULL; 656 657 csr = musb_readw(epio, MUSB_TXCSR); 658 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); 659 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); 660 return false; 661 } 662 return true; 663 } 664 665 /* 666 * Program an HDRC endpoint as per the given URB 667 * Context: irqs blocked, controller lock held 668 */ 669 static void musb_ep_program(struct musb *musb, u8 epnum, 670 struct urb *urb, int is_out, 671 u8 *buf, u32 offset, u32 len) 672 { 673 struct dma_controller *dma_controller; 674 struct dma_channel *dma_channel; 675 u8 dma_ok; 676 void __iomem *mbase = musb->mregs; 677 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 678 void __iomem *epio = hw_ep->regs; 679 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); 680 u16 packet_sz = qh->maxpacket; 681 u8 use_dma = 1; 682 u16 csr; 683 684 musb_dbg(musb, "%s hw%d urb %p spd%d dev%d ep%d%s " 685 "h_addr%02x h_port%02x bytes %d", 686 is_out ? "-->" : "<--", 687 epnum, urb, urb->dev->speed, 688 qh->addr_reg, qh->epnum, is_out ? "out" : "in", 689 qh->h_addr_reg, qh->h_port_reg, 690 len); 691 692 musb_ep_select(mbase, epnum); 693 694 if (is_out && !len) { 695 use_dma = 0; 696 csr = musb_readw(epio, MUSB_TXCSR); 697 csr &= ~MUSB_TXCSR_DMAENAB; 698 musb_writew(epio, MUSB_TXCSR, csr); 699 hw_ep->tx_channel = NULL; 700 } 701 702 /* candidate for DMA? */ 703 dma_controller = musb->dma_controller; 704 if (use_dma && is_dma_capable() && epnum && dma_controller) { 705 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; 706 if (!dma_channel) { 707 dma_channel = dma_controller->channel_alloc( 708 dma_controller, hw_ep, is_out); 709 if (is_out) 710 hw_ep->tx_channel = dma_channel; 711 else 712 hw_ep->rx_channel = dma_channel; 713 } 714 } else 715 dma_channel = NULL; 716 717 /* make sure we clear DMAEnab, autoSet bits from previous run */ 718 719 /* OUT/transmit/EP0 or IN/receive? */ 720 if (is_out) { 721 u16 csr; 722 u16 int_txe; 723 u16 load_count; 724 725 csr = musb_readw(epio, MUSB_TXCSR); 726 727 /* disable interrupt in case we flush */ 728 int_txe = musb->intrtxe; 729 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); 730 731 /* general endpoint setup */ 732 if (epnum) { 733 /* flush all old state, set default */ 734 /* 735 * We could be flushing valid 736 * packets in double buffering 737 * case 738 */ 739 if (!hw_ep->tx_double_buffered) 740 musb_h_tx_flush_fifo(hw_ep); 741 742 /* 743 * We must not clear the DMAMODE bit before or in 744 * the same cycle with the DMAENAB bit, so we clear 745 * the latter first... 746 */ 747 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT 748 | MUSB_TXCSR_AUTOSET 749 | MUSB_TXCSR_DMAENAB 750 | MUSB_TXCSR_FRCDATATOG 751 | MUSB_TXCSR_H_RXSTALL 752 | MUSB_TXCSR_H_ERROR 753 | MUSB_TXCSR_TXPKTRDY 754 ); 755 csr |= MUSB_TXCSR_MODE; 756 757 if (!hw_ep->tx_double_buffered) 758 csr |= musb->io.set_toggle(qh, is_out, urb); 759 760 musb_writew(epio, MUSB_TXCSR, csr); 761 /* REVISIT may need to clear FLUSHFIFO ... */ 762 csr &= ~MUSB_TXCSR_DMAMODE; 763 musb_writew(epio, MUSB_TXCSR, csr); 764 csr = musb_readw(epio, MUSB_TXCSR); 765 } else { 766 /* endpoint 0: just flush */ 767 musb_h_ep0_flush_fifo(hw_ep); 768 } 769 770 /* target addr and (for multipoint) hub addr/port */ 771 if (musb->is_multipoint) { 772 musb_write_txfunaddr(musb, epnum, qh->addr_reg); 773 musb_write_txhubaddr(musb, epnum, qh->h_addr_reg); 774 musb_write_txhubport(musb, epnum, qh->h_port_reg); 775 /* FIXME if !epnum, do the same for RX ... */ 776 } else 777 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); 778 779 /* protocol/endpoint/interval/NAKlimit */ 780 if (epnum) { 781 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); 782 if (can_bulk_split(musb, qh->type)) { 783 qh->hb_mult = hw_ep->max_packet_sz_tx 784 / packet_sz; 785 musb_writew(epio, MUSB_TXMAXP, packet_sz 786 | ((qh->hb_mult) - 1) << 11); 787 } else { 788 musb_writew(epio, MUSB_TXMAXP, 789 qh->maxpacket | 790 ((qh->hb_mult - 1) << 11)); 791 } 792 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); 793 } else { 794 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); 795 if (musb->is_multipoint) 796 musb_writeb(epio, MUSB_TYPE0, 797 qh->type_reg); 798 } 799 800 if (can_bulk_split(musb, qh->type)) 801 load_count = min((u32) hw_ep->max_packet_sz_tx, 802 len); 803 else 804 load_count = min((u32) packet_sz, len); 805 806 if (dma_channel && musb_tx_dma_program(dma_controller, 807 hw_ep, qh, urb, offset, len)) 808 load_count = 0; 809 810 if (load_count) { 811 /* PIO to load FIFO */ 812 qh->segsize = load_count; 813 if (!buf) { 814 sg_miter_start(&qh->sg_miter, urb->sg, 1, 815 SG_MITER_ATOMIC 816 | SG_MITER_FROM_SG); 817 if (!sg_miter_next(&qh->sg_miter)) { 818 dev_err(musb->controller, 819 "error: sg" 820 "list empty\n"); 821 sg_miter_stop(&qh->sg_miter); 822 goto finish; 823 } 824 buf = qh->sg_miter.addr + urb->sg->offset + 825 urb->actual_length; 826 load_count = min_t(u32, load_count, 827 qh->sg_miter.length); 828 musb_write_fifo(hw_ep, load_count, buf); 829 qh->sg_miter.consumed = load_count; 830 sg_miter_stop(&qh->sg_miter); 831 } else 832 musb_write_fifo(hw_ep, load_count, buf); 833 } 834 finish: 835 /* re-enable interrupt */ 836 musb_writew(mbase, MUSB_INTRTXE, int_txe); 837 838 /* IN/receive */ 839 } else { 840 u16 csr = 0; 841 842 if (hw_ep->rx_reinit) { 843 musb_rx_reinit(musb, qh, epnum); 844 csr |= musb->io.set_toggle(qh, is_out, urb); 845 846 if (qh->type == USB_ENDPOINT_XFER_INT) 847 csr |= MUSB_RXCSR_DISNYET; 848 849 } else { 850 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 851 852 if (csr & (MUSB_RXCSR_RXPKTRDY 853 | MUSB_RXCSR_DMAENAB 854 | MUSB_RXCSR_H_REQPKT)) 855 ERR("broken !rx_reinit, ep%d csr %04x\n", 856 hw_ep->epnum, csr); 857 858 /* scrub any stale state, leaving toggle alone */ 859 csr &= MUSB_RXCSR_DISNYET; 860 } 861 862 /* kick things off */ 863 864 if ((is_cppi_enabled(musb) || tusb_dma_omap(musb)) && dma_channel) { 865 /* Candidate for DMA */ 866 dma_channel->actual_len = 0L; 867 qh->segsize = len; 868 869 /* AUTOREQ is in a DMA register */ 870 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 871 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 872 873 /* 874 * Unless caller treats short RX transfers as 875 * errors, we dare not queue multiple transfers. 876 */ 877 dma_ok = dma_controller->channel_program(dma_channel, 878 packet_sz, !(urb->transfer_flags & 879 URB_SHORT_NOT_OK), 880 urb->transfer_dma + offset, 881 qh->segsize); 882 if (!dma_ok) { 883 dma_controller->channel_release(dma_channel); 884 hw_ep->rx_channel = dma_channel = NULL; 885 } else 886 csr |= MUSB_RXCSR_DMAENAB; 887 } 888 889 csr |= MUSB_RXCSR_H_REQPKT; 890 musb_dbg(musb, "RXCSR%d := %04x", epnum, csr); 891 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 892 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 893 } 894 } 895 896 /* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to 897 * the end; avoids starvation for other endpoints. 898 */ 899 static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep, 900 int is_in) 901 { 902 struct dma_channel *dma; 903 struct urb *urb; 904 void __iomem *mbase = musb->mregs; 905 void __iomem *epio = ep->regs; 906 struct musb_qh *cur_qh, *next_qh; 907 u16 rx_csr, tx_csr; 908 u16 toggle; 909 910 musb_ep_select(mbase, ep->epnum); 911 if (is_in) { 912 dma = is_dma_capable() ? ep->rx_channel : NULL; 913 914 /* 915 * Need to stop the transaction by clearing REQPKT first 916 * then the NAK Timeout bit ref MUSBMHDRC USB 2.0 HIGH-SPEED 917 * DUAL-ROLE CONTROLLER Programmer's Guide, section 9.2.2 918 */ 919 rx_csr = musb_readw(epio, MUSB_RXCSR); 920 rx_csr |= MUSB_RXCSR_H_WZC_BITS; 921 rx_csr &= ~MUSB_RXCSR_H_REQPKT; 922 musb_writew(epio, MUSB_RXCSR, rx_csr); 923 rx_csr &= ~MUSB_RXCSR_DATAERROR; 924 musb_writew(epio, MUSB_RXCSR, rx_csr); 925 926 cur_qh = first_qh(&musb->in_bulk); 927 } else { 928 dma = is_dma_capable() ? ep->tx_channel : NULL; 929 930 /* clear nak timeout bit */ 931 tx_csr = musb_readw(epio, MUSB_TXCSR); 932 tx_csr |= MUSB_TXCSR_H_WZC_BITS; 933 tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT; 934 musb_writew(epio, MUSB_TXCSR, tx_csr); 935 936 cur_qh = first_qh(&musb->out_bulk); 937 } 938 if (cur_qh) { 939 urb = next_urb(cur_qh); 940 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 941 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 942 musb->dma_controller->channel_abort(dma); 943 urb->actual_length += dma->actual_len; 944 dma->actual_len = 0L; 945 } 946 toggle = musb->io.get_toggle(cur_qh, !is_in); 947 usb_settoggle(urb->dev, cur_qh->epnum, !is_in, toggle ? 1 : 0); 948 949 if (is_in) { 950 /* move cur_qh to end of queue */ 951 list_move_tail(&cur_qh->ring, &musb->in_bulk); 952 953 /* get the next qh from musb->in_bulk */ 954 next_qh = first_qh(&musb->in_bulk); 955 956 /* set rx_reinit and schedule the next qh */ 957 ep->rx_reinit = 1; 958 } else { 959 /* move cur_qh to end of queue */ 960 list_move_tail(&cur_qh->ring, &musb->out_bulk); 961 962 /* get the next qh from musb->out_bulk */ 963 next_qh = first_qh(&musb->out_bulk); 964 965 /* set tx_reinit and schedule the next qh */ 966 ep->tx_reinit = 1; 967 } 968 969 if (next_qh) 970 musb_start_urb(musb, is_in, next_qh); 971 } 972 } 973 974 /* 975 * Service the default endpoint (ep0) as host. 976 * Return true until it's time to start the status stage. 977 */ 978 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) 979 { 980 bool more = false; 981 u8 *fifo_dest = NULL; 982 u16 fifo_count = 0; 983 struct musb_hw_ep *hw_ep = musb->control_ep; 984 struct musb_qh *qh = hw_ep->in_qh; 985 struct usb_ctrlrequest *request; 986 987 switch (musb->ep0_stage) { 988 case MUSB_EP0_IN: 989 fifo_dest = urb->transfer_buffer + urb->actual_length; 990 fifo_count = min_t(size_t, len, urb->transfer_buffer_length - 991 urb->actual_length); 992 if (fifo_count < len) 993 urb->status = -EOVERFLOW; 994 995 musb_read_fifo(hw_ep, fifo_count, fifo_dest); 996 997 urb->actual_length += fifo_count; 998 if (len < qh->maxpacket) { 999 /* always terminate on short read; it's 1000 * rarely reported as an error. 1001 */ 1002 } else if (urb->actual_length < 1003 urb->transfer_buffer_length) 1004 more = true; 1005 break; 1006 case MUSB_EP0_START: 1007 request = (struct usb_ctrlrequest *) urb->setup_packet; 1008 1009 if (!request->wLength) { 1010 musb_dbg(musb, "start no-DATA"); 1011 break; 1012 } else if (request->bRequestType & USB_DIR_IN) { 1013 musb_dbg(musb, "start IN-DATA"); 1014 musb->ep0_stage = MUSB_EP0_IN; 1015 more = true; 1016 break; 1017 } else { 1018 musb_dbg(musb, "start OUT-DATA"); 1019 musb->ep0_stage = MUSB_EP0_OUT; 1020 more = true; 1021 } 1022 fallthrough; 1023 case MUSB_EP0_OUT: 1024 fifo_count = min_t(size_t, qh->maxpacket, 1025 urb->transfer_buffer_length - 1026 urb->actual_length); 1027 if (fifo_count) { 1028 fifo_dest = (u8 *) (urb->transfer_buffer 1029 + urb->actual_length); 1030 musb_dbg(musb, "Sending %d byte%s to ep0 fifo %p", 1031 fifo_count, 1032 (fifo_count == 1) ? "" : "s", 1033 fifo_dest); 1034 musb_write_fifo(hw_ep, fifo_count, fifo_dest); 1035 1036 urb->actual_length += fifo_count; 1037 more = true; 1038 } 1039 break; 1040 default: 1041 ERR("bogus ep0 stage %d\n", musb->ep0_stage); 1042 break; 1043 } 1044 1045 return more; 1046 } 1047 1048 /* 1049 * Handle default endpoint interrupt as host. Only called in IRQ time 1050 * from musb_interrupt(). 1051 * 1052 * called with controller irqlocked 1053 */ 1054 irqreturn_t musb_h_ep0_irq(struct musb *musb) 1055 { 1056 struct urb *urb; 1057 u16 csr, len; 1058 int status = 0; 1059 void __iomem *mbase = musb->mregs; 1060 struct musb_hw_ep *hw_ep = musb->control_ep; 1061 void __iomem *epio = hw_ep->regs; 1062 struct musb_qh *qh = hw_ep->in_qh; 1063 bool complete = false; 1064 irqreturn_t retval = IRQ_NONE; 1065 1066 /* ep0 only has one queue, "in" */ 1067 urb = next_urb(qh); 1068 1069 musb_ep_select(mbase, 0); 1070 csr = musb_readw(epio, MUSB_CSR0); 1071 len = (csr & MUSB_CSR0_RXPKTRDY) 1072 ? musb_readb(epio, MUSB_COUNT0) 1073 : 0; 1074 1075 musb_dbg(musb, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d", 1076 csr, qh, len, urb, musb->ep0_stage); 1077 1078 /* if we just did status stage, we are done */ 1079 if (MUSB_EP0_STATUS == musb->ep0_stage) { 1080 retval = IRQ_HANDLED; 1081 complete = true; 1082 } 1083 1084 /* prepare status */ 1085 if (csr & MUSB_CSR0_H_RXSTALL) { 1086 musb_dbg(musb, "STALLING ENDPOINT"); 1087 status = -EPIPE; 1088 1089 } else if (csr & MUSB_CSR0_H_ERROR) { 1090 musb_dbg(musb, "no response, csr0 %04x", csr); 1091 status = -EPROTO; 1092 1093 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { 1094 musb_dbg(musb, "control NAK timeout"); 1095 1096 /* NOTE: this code path would be a good place to PAUSE a 1097 * control transfer, if another one is queued, so that 1098 * ep0 is more likely to stay busy. That's already done 1099 * for bulk RX transfers. 1100 * 1101 * if (qh->ring.next != &musb->control), then 1102 * we have a candidate... NAKing is *NOT* an error 1103 */ 1104 musb_writew(epio, MUSB_CSR0, 0); 1105 retval = IRQ_HANDLED; 1106 } 1107 1108 if (status) { 1109 musb_dbg(musb, "aborting"); 1110 retval = IRQ_HANDLED; 1111 if (urb) 1112 urb->status = status; 1113 complete = true; 1114 1115 /* use the proper sequence to abort the transfer */ 1116 if (csr & MUSB_CSR0_H_REQPKT) { 1117 csr &= ~MUSB_CSR0_H_REQPKT; 1118 musb_writew(epio, MUSB_CSR0, csr); 1119 csr &= ~MUSB_CSR0_H_NAKTIMEOUT; 1120 musb_writew(epio, MUSB_CSR0, csr); 1121 } else { 1122 musb_h_ep0_flush_fifo(hw_ep); 1123 } 1124 1125 musb_writeb(epio, MUSB_NAKLIMIT0, 0); 1126 1127 /* clear it */ 1128 musb_writew(epio, MUSB_CSR0, 0); 1129 } 1130 1131 if (unlikely(!urb)) { 1132 /* stop endpoint since we have no place for its data, this 1133 * SHOULD NEVER HAPPEN! */ 1134 ERR("no URB for end 0\n"); 1135 1136 musb_h_ep0_flush_fifo(hw_ep); 1137 goto done; 1138 } 1139 1140 if (!complete) { 1141 /* call common logic and prepare response */ 1142 if (musb_h_ep0_continue(musb, len, urb)) { 1143 /* more packets required */ 1144 csr = (MUSB_EP0_IN == musb->ep0_stage) 1145 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; 1146 } else { 1147 /* data transfer complete; perform status phase */ 1148 if (usb_pipeout(urb->pipe) 1149 || !urb->transfer_buffer_length) 1150 csr = MUSB_CSR0_H_STATUSPKT 1151 | MUSB_CSR0_H_REQPKT; 1152 else 1153 csr = MUSB_CSR0_H_STATUSPKT 1154 | MUSB_CSR0_TXPKTRDY; 1155 1156 /* disable ping token in status phase */ 1157 csr |= MUSB_CSR0_H_DIS_PING; 1158 1159 /* flag status stage */ 1160 musb->ep0_stage = MUSB_EP0_STATUS; 1161 1162 musb_dbg(musb, "ep0 STATUS, csr %04x", csr); 1163 1164 } 1165 musb_writew(epio, MUSB_CSR0, csr); 1166 retval = IRQ_HANDLED; 1167 } else 1168 musb->ep0_stage = MUSB_EP0_IDLE; 1169 1170 /* call completion handler if done */ 1171 if (complete) 1172 musb_advance_schedule(musb, urb, hw_ep, 1); 1173 done: 1174 return retval; 1175 } 1176 1177 1178 #ifdef CONFIG_USB_INVENTRA_DMA 1179 1180 /* Host side TX (OUT) using Mentor DMA works as follows: 1181 submit_urb -> 1182 - if queue was empty, Program Endpoint 1183 - ... which starts DMA to fifo in mode 1 or 0 1184 1185 DMA Isr (transfer complete) -> TxAvail() 1186 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens 1187 only in musb_cleanup_urb) 1188 - TxPktRdy has to be set in mode 0 or for 1189 short packets in mode 1. 1190 */ 1191 1192 #endif 1193 1194 /* Service a Tx-Available or dma completion irq for the endpoint */ 1195 void musb_host_tx(struct musb *musb, u8 epnum) 1196 { 1197 int pipe; 1198 bool done = false; 1199 u16 tx_csr; 1200 size_t length = 0; 1201 size_t offset = 0; 1202 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 1203 void __iomem *epio = hw_ep->regs; 1204 struct musb_qh *qh = hw_ep->out_qh; 1205 struct urb *urb = next_urb(qh); 1206 u32 status = 0; 1207 void __iomem *mbase = musb->mregs; 1208 struct dma_channel *dma; 1209 bool transfer_pending = false; 1210 1211 musb_ep_select(mbase, epnum); 1212 tx_csr = musb_readw(epio, MUSB_TXCSR); 1213 1214 /* with CPPI, DMA sometimes triggers "extra" irqs */ 1215 if (!urb) { 1216 musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr); 1217 return; 1218 } 1219 1220 pipe = urb->pipe; 1221 dma = is_dma_capable() ? hw_ep->tx_channel : NULL; 1222 trace_musb_urb_tx(musb, urb); 1223 musb_dbg(musb, "OUT/TX%d end, csr %04x%s", epnum, tx_csr, 1224 dma ? ", dma" : ""); 1225 1226 /* check for errors */ 1227 if (tx_csr & MUSB_TXCSR_H_RXSTALL) { 1228 /* dma was disabled, fifo flushed */ 1229 musb_dbg(musb, "TX end %d stall", epnum); 1230 1231 /* stall; record URB status */ 1232 status = -EPIPE; 1233 1234 } else if (tx_csr & MUSB_TXCSR_H_ERROR) { 1235 /* (NON-ISO) dma was disabled, fifo flushed */ 1236 musb_dbg(musb, "TX 3strikes on ep=%d", epnum); 1237 1238 status = -ETIMEDOUT; 1239 1240 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { 1241 if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1 1242 && !list_is_singular(&musb->out_bulk)) { 1243 musb_dbg(musb, "NAK timeout on TX%d ep", epnum); 1244 musb_bulk_nak_timeout(musb, hw_ep, 0); 1245 } else { 1246 musb_dbg(musb, "TX ep%d device not responding", epnum); 1247 /* NOTE: this code path would be a good place to PAUSE a 1248 * transfer, if there's some other (nonperiodic) tx urb 1249 * that could use this fifo. (dma complicates it...) 1250 * That's already done for bulk RX transfers. 1251 * 1252 * if (bulk && qh->ring.next != &musb->out_bulk), then 1253 * we have a candidate... NAKing is *NOT* an error 1254 */ 1255 musb_ep_select(mbase, epnum); 1256 musb_writew(epio, MUSB_TXCSR, 1257 MUSB_TXCSR_H_WZC_BITS 1258 | MUSB_TXCSR_TXPKTRDY); 1259 } 1260 return; 1261 } 1262 1263 done: 1264 if (status) { 1265 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1266 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1267 musb->dma_controller->channel_abort(dma); 1268 } 1269 1270 /* do the proper sequence to abort the transfer in the 1271 * usb core; the dma engine should already be stopped. 1272 */ 1273 musb_h_tx_flush_fifo(hw_ep); 1274 tx_csr &= ~(MUSB_TXCSR_AUTOSET 1275 | MUSB_TXCSR_DMAENAB 1276 | MUSB_TXCSR_H_ERROR 1277 | MUSB_TXCSR_H_RXSTALL 1278 | MUSB_TXCSR_H_NAKTIMEOUT 1279 ); 1280 1281 musb_ep_select(mbase, epnum); 1282 musb_writew(epio, MUSB_TXCSR, tx_csr); 1283 /* REVISIT may need to clear FLUSHFIFO ... */ 1284 musb_writew(epio, MUSB_TXCSR, tx_csr); 1285 musb_writeb(epio, MUSB_TXINTERVAL, 0); 1286 1287 done = true; 1288 } 1289 1290 /* second cppi case */ 1291 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1292 musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr); 1293 return; 1294 } 1295 1296 if (is_dma_capable() && dma && !status) { 1297 /* 1298 * DMA has completed. But if we're using DMA mode 1 (multi 1299 * packet DMA), we need a terminal TXPKTRDY interrupt before 1300 * we can consider this transfer completed, lest we trash 1301 * its last packet when writing the next URB's data. So we 1302 * switch back to mode 0 to get that interrupt; we'll come 1303 * back here once it happens. 1304 */ 1305 if (tx_csr & MUSB_TXCSR_DMAMODE) { 1306 /* 1307 * We shouldn't clear DMAMODE with DMAENAB set; so 1308 * clear them in a safe order. That should be OK 1309 * once TXPKTRDY has been set (and I've never seen 1310 * it being 0 at this moment -- DMA interrupt latency 1311 * is significant) but if it hasn't been then we have 1312 * no choice but to stop being polite and ignore the 1313 * programmer's guide... :-) 1314 * 1315 * Note that we must write TXCSR with TXPKTRDY cleared 1316 * in order not to re-trigger the packet send (this bit 1317 * can't be cleared by CPU), and there's another caveat: 1318 * TXPKTRDY may be set shortly and then cleared in the 1319 * double-buffered FIFO mode, so we do an extra TXCSR 1320 * read for debouncing... 1321 */ 1322 tx_csr &= musb_readw(epio, MUSB_TXCSR); 1323 if (tx_csr & MUSB_TXCSR_TXPKTRDY) { 1324 tx_csr &= ~(MUSB_TXCSR_DMAENAB | 1325 MUSB_TXCSR_TXPKTRDY); 1326 musb_writew(epio, MUSB_TXCSR, 1327 tx_csr | MUSB_TXCSR_H_WZC_BITS); 1328 } 1329 tx_csr &= ~(MUSB_TXCSR_DMAMODE | 1330 MUSB_TXCSR_TXPKTRDY); 1331 musb_writew(epio, MUSB_TXCSR, 1332 tx_csr | MUSB_TXCSR_H_WZC_BITS); 1333 1334 /* 1335 * There is no guarantee that we'll get an interrupt 1336 * after clearing DMAMODE as we might have done this 1337 * too late (after TXPKTRDY was cleared by controller). 1338 * Re-read TXCSR as we have spoiled its previous value. 1339 */ 1340 tx_csr = musb_readw(epio, MUSB_TXCSR); 1341 } 1342 1343 /* 1344 * We may get here from a DMA completion or TXPKTRDY interrupt. 1345 * In any case, we must check the FIFO status here and bail out 1346 * only if the FIFO still has data -- that should prevent the 1347 * "missed" TXPKTRDY interrupts and deal with double-buffered 1348 * FIFO mode too... 1349 */ 1350 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { 1351 musb_dbg(musb, 1352 "DMA complete but FIFO not empty, CSR %04x", 1353 tx_csr); 1354 return; 1355 } 1356 } 1357 1358 if (!status || dma || usb_pipeisoc(pipe)) { 1359 if (dma) 1360 length = dma->actual_len; 1361 else 1362 length = qh->segsize; 1363 qh->offset += length; 1364 1365 if (usb_pipeisoc(pipe)) { 1366 struct usb_iso_packet_descriptor *d; 1367 1368 d = urb->iso_frame_desc + qh->iso_idx; 1369 d->actual_length = length; 1370 d->status = status; 1371 if (++qh->iso_idx >= urb->number_of_packets) { 1372 done = true; 1373 } else { 1374 d++; 1375 offset = d->offset; 1376 length = d->length; 1377 } 1378 } else if (dma && urb->transfer_buffer_length == qh->offset) { 1379 done = true; 1380 } else { 1381 /* see if we need to send more data, or ZLP */ 1382 if (qh->segsize < qh->maxpacket) 1383 done = true; 1384 else if (qh->offset == urb->transfer_buffer_length 1385 && !(urb->transfer_flags 1386 & URB_ZERO_PACKET)) 1387 done = true; 1388 if (!done) { 1389 offset = qh->offset; 1390 length = urb->transfer_buffer_length - offset; 1391 transfer_pending = true; 1392 } 1393 } 1394 } 1395 1396 /* urb->status != -EINPROGRESS means request has been faulted, 1397 * so we must abort this transfer after cleanup 1398 */ 1399 if (urb->status != -EINPROGRESS) { 1400 done = true; 1401 if (status == 0) 1402 status = urb->status; 1403 } 1404 1405 if (done) { 1406 /* set status */ 1407 urb->status = status; 1408 urb->actual_length = qh->offset; 1409 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); 1410 return; 1411 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { 1412 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, 1413 offset, length)) { 1414 if (is_cppi_enabled(musb) || tusb_dma_omap(musb)) 1415 musb_h_tx_dma_start(hw_ep); 1416 return; 1417 } 1418 } else if (tx_csr & MUSB_TXCSR_DMAENAB) { 1419 musb_dbg(musb, "not complete, but DMA enabled?"); 1420 return; 1421 } 1422 1423 /* 1424 * PIO: start next packet in this URB. 1425 * 1426 * REVISIT: some docs say that when hw_ep->tx_double_buffered, 1427 * (and presumably, FIFO is not half-full) we should write *two* 1428 * packets before updating TXCSR; other docs disagree... 1429 */ 1430 if (length > qh->maxpacket) 1431 length = qh->maxpacket; 1432 /* Unmap the buffer so that CPU can use it */ 1433 usb_hcd_unmap_urb_for_dma(musb->hcd, urb); 1434 1435 /* 1436 * We need to map sg if the transfer_buffer is 1437 * NULL. 1438 */ 1439 if (!urb->transfer_buffer) { 1440 /* sg_miter_start is already done in musb_ep_program */ 1441 if (!sg_miter_next(&qh->sg_miter)) { 1442 dev_err(musb->controller, "error: sg list empty\n"); 1443 sg_miter_stop(&qh->sg_miter); 1444 status = -EINVAL; 1445 goto done; 1446 } 1447 length = min_t(u32, length, qh->sg_miter.length); 1448 musb_write_fifo(hw_ep, length, qh->sg_miter.addr); 1449 qh->sg_miter.consumed = length; 1450 sg_miter_stop(&qh->sg_miter); 1451 } else { 1452 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); 1453 } 1454 1455 qh->segsize = length; 1456 1457 musb_ep_select(mbase, epnum); 1458 musb_writew(epio, MUSB_TXCSR, 1459 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); 1460 } 1461 1462 #ifdef CONFIG_USB_TI_CPPI41_DMA 1463 /* Seems to set up ISO for cppi41 and not advance len. See commit c57c41d */ 1464 static int musb_rx_dma_iso_cppi41(struct dma_controller *dma, 1465 struct musb_hw_ep *hw_ep, 1466 struct musb_qh *qh, 1467 struct urb *urb, 1468 size_t len) 1469 { 1470 struct dma_channel *channel = hw_ep->rx_channel; 1471 void __iomem *epio = hw_ep->regs; 1472 dma_addr_t *buf; 1473 u32 length; 1474 u16 val; 1475 1476 buf = (void *)urb->iso_frame_desc[qh->iso_idx].offset + 1477 (u32)urb->transfer_dma; 1478 1479 length = urb->iso_frame_desc[qh->iso_idx].length; 1480 1481 val = musb_readw(epio, MUSB_RXCSR); 1482 val |= MUSB_RXCSR_DMAENAB; 1483 musb_writew(hw_ep->regs, MUSB_RXCSR, val); 1484 1485 return dma->channel_program(channel, qh->maxpacket, 0, 1486 (u32)buf, length); 1487 } 1488 #else 1489 static inline int musb_rx_dma_iso_cppi41(struct dma_controller *dma, 1490 struct musb_hw_ep *hw_ep, 1491 struct musb_qh *qh, 1492 struct urb *urb, 1493 size_t len) 1494 { 1495 return false; 1496 } 1497 #endif 1498 1499 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \ 1500 defined(CONFIG_USB_TI_CPPI41_DMA) 1501 /* Host side RX (IN) using Mentor DMA works as follows: 1502 submit_urb -> 1503 - if queue was empty, ProgramEndpoint 1504 - first IN token is sent out (by setting ReqPkt) 1505 LinuxIsr -> RxReady() 1506 /\ => first packet is received 1507 | - Set in mode 0 (DmaEnab, ~ReqPkt) 1508 | -> DMA Isr (transfer complete) -> RxReady() 1509 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) 1510 | - if urb not complete, send next IN token (ReqPkt) 1511 | | else complete urb. 1512 | | 1513 --------------------------- 1514 * 1515 * Nuances of mode 1: 1516 * For short packets, no ack (+RxPktRdy) is sent automatically 1517 * (even if AutoClear is ON) 1518 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent 1519 * automatically => major problem, as collecting the next packet becomes 1520 * difficult. Hence mode 1 is not used. 1521 * 1522 * REVISIT 1523 * All we care about at this driver level is that 1524 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; 1525 * (b) termination conditions are: short RX, or buffer full; 1526 * (c) fault modes include 1527 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. 1528 * (and that endpoint's dma queue stops immediately) 1529 * - overflow (full, PLUS more bytes in the terminal packet) 1530 * 1531 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would 1532 * thus be a great candidate for using mode 1 ... for all but the 1533 * last packet of one URB's transfer. 1534 */ 1535 static int musb_rx_dma_inventra_cppi41(struct dma_controller *dma, 1536 struct musb_hw_ep *hw_ep, 1537 struct musb_qh *qh, 1538 struct urb *urb, 1539 size_t len) 1540 { 1541 struct dma_channel *channel = hw_ep->rx_channel; 1542 void __iomem *epio = hw_ep->regs; 1543 u16 val; 1544 int pipe; 1545 bool done; 1546 1547 pipe = urb->pipe; 1548 1549 if (usb_pipeisoc(pipe)) { 1550 struct usb_iso_packet_descriptor *d; 1551 1552 d = urb->iso_frame_desc + qh->iso_idx; 1553 d->actual_length = len; 1554 1555 /* even if there was an error, we did the dma 1556 * for iso_frame_desc->length 1557 */ 1558 if (d->status != -EILSEQ && d->status != -EOVERFLOW) 1559 d->status = 0; 1560 1561 if (++qh->iso_idx >= urb->number_of_packets) { 1562 done = true; 1563 } else { 1564 /* REVISIT: Why ignore return value here? */ 1565 if (musb_dma_cppi41(hw_ep->musb)) 1566 done = musb_rx_dma_iso_cppi41(dma, hw_ep, qh, 1567 urb, len); 1568 done = false; 1569 } 1570 1571 } else { 1572 /* done if urb buffer is full or short packet is recd */ 1573 done = (urb->actual_length + len >= 1574 urb->transfer_buffer_length 1575 || channel->actual_len < qh->maxpacket 1576 || channel->rx_packet_done); 1577 } 1578 1579 /* send IN token for next packet, without AUTOREQ */ 1580 if (!done) { 1581 val = musb_readw(epio, MUSB_RXCSR); 1582 val |= MUSB_RXCSR_H_REQPKT; 1583 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val); 1584 } 1585 1586 return done; 1587 } 1588 1589 /* Disadvantage of using mode 1: 1590 * It's basically usable only for mass storage class; essentially all 1591 * other protocols also terminate transfers on short packets. 1592 * 1593 * Details: 1594 * An extra IN token is sent at the end of the transfer (due to AUTOREQ) 1595 * If you try to use mode 1 for (transfer_buffer_length - 512), and try 1596 * to use the extra IN token to grab the last packet using mode 0, then 1597 * the problem is that you cannot be sure when the device will send the 1598 * last packet and RxPktRdy set. Sometimes the packet is recd too soon 1599 * such that it gets lost when RxCSR is re-set at the end of the mode 1 1600 * transfer, while sometimes it is recd just a little late so that if you 1601 * try to configure for mode 0 soon after the mode 1 transfer is 1602 * completed, you will find rxcount 0. Okay, so you might think why not 1603 * wait for an interrupt when the pkt is recd. Well, you won't get any! 1604 */ 1605 static int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma, 1606 struct musb_hw_ep *hw_ep, 1607 struct musb_qh *qh, 1608 struct urb *urb, 1609 size_t len, 1610 u8 iso_err) 1611 { 1612 struct musb *musb = hw_ep->musb; 1613 void __iomem *epio = hw_ep->regs; 1614 struct dma_channel *channel = hw_ep->rx_channel; 1615 u16 rx_count, val; 1616 int length, pipe, done; 1617 dma_addr_t buf; 1618 1619 rx_count = musb_readw(epio, MUSB_RXCOUNT); 1620 pipe = urb->pipe; 1621 1622 if (usb_pipeisoc(pipe)) { 1623 int d_status = 0; 1624 struct usb_iso_packet_descriptor *d; 1625 1626 d = urb->iso_frame_desc + qh->iso_idx; 1627 1628 if (iso_err) { 1629 d_status = -EILSEQ; 1630 urb->error_count++; 1631 } 1632 if (rx_count > d->length) { 1633 if (d_status == 0) { 1634 d_status = -EOVERFLOW; 1635 urb->error_count++; 1636 } 1637 musb_dbg(musb, "** OVERFLOW %d into %d", 1638 rx_count, d->length); 1639 1640 length = d->length; 1641 } else 1642 length = rx_count; 1643 d->status = d_status; 1644 buf = urb->transfer_dma + d->offset; 1645 } else { 1646 length = rx_count; 1647 buf = urb->transfer_dma + urb->actual_length; 1648 } 1649 1650 channel->desired_mode = 0; 1651 #ifdef USE_MODE1 1652 /* because of the issue below, mode 1 will 1653 * only rarely behave with correct semantics. 1654 */ 1655 if ((urb->transfer_flags & URB_SHORT_NOT_OK) 1656 && (urb->transfer_buffer_length - urb->actual_length) 1657 > qh->maxpacket) 1658 channel->desired_mode = 1; 1659 if (rx_count < hw_ep->max_packet_sz_rx) { 1660 length = rx_count; 1661 channel->desired_mode = 0; 1662 } else { 1663 length = urb->transfer_buffer_length; 1664 } 1665 #endif 1666 1667 /* See comments above on disadvantages of using mode 1 */ 1668 val = musb_readw(epio, MUSB_RXCSR); 1669 val &= ~MUSB_RXCSR_H_REQPKT; 1670 1671 if (channel->desired_mode == 0) 1672 val &= ~MUSB_RXCSR_H_AUTOREQ; 1673 else 1674 val |= MUSB_RXCSR_H_AUTOREQ; 1675 val |= MUSB_RXCSR_DMAENAB; 1676 1677 /* autoclear shouldn't be set in high bandwidth */ 1678 if (qh->hb_mult == 1) 1679 val |= MUSB_RXCSR_AUTOCLEAR; 1680 1681 musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val); 1682 1683 /* REVISIT if when actual_length != 0, 1684 * transfer_buffer_length needs to be 1685 * adjusted first... 1686 */ 1687 done = dma->channel_program(channel, qh->maxpacket, 1688 channel->desired_mode, 1689 buf, length); 1690 1691 if (!done) { 1692 dma->channel_release(channel); 1693 hw_ep->rx_channel = NULL; 1694 channel = NULL; 1695 val = musb_readw(epio, MUSB_RXCSR); 1696 val &= ~(MUSB_RXCSR_DMAENAB 1697 | MUSB_RXCSR_H_AUTOREQ 1698 | MUSB_RXCSR_AUTOCLEAR); 1699 musb_writew(epio, MUSB_RXCSR, val); 1700 } 1701 1702 return done; 1703 } 1704 #else 1705 static inline int musb_rx_dma_inventra_cppi41(struct dma_controller *dma, 1706 struct musb_hw_ep *hw_ep, 1707 struct musb_qh *qh, 1708 struct urb *urb, 1709 size_t len) 1710 { 1711 return false; 1712 } 1713 1714 static inline int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma, 1715 struct musb_hw_ep *hw_ep, 1716 struct musb_qh *qh, 1717 struct urb *urb, 1718 size_t len, 1719 u8 iso_err) 1720 { 1721 return false; 1722 } 1723 #endif 1724 1725 /* 1726 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, 1727 * and high-bandwidth IN transfer cases. 1728 */ 1729 void musb_host_rx(struct musb *musb, u8 epnum) 1730 { 1731 struct urb *urb; 1732 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 1733 struct dma_controller *c = musb->dma_controller; 1734 void __iomem *epio = hw_ep->regs; 1735 struct musb_qh *qh = hw_ep->in_qh; 1736 size_t xfer_len; 1737 void __iomem *mbase = musb->mregs; 1738 u16 rx_csr, val; 1739 bool iso_err = false; 1740 bool done = false; 1741 u32 status; 1742 struct dma_channel *dma; 1743 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; 1744 1745 musb_ep_select(mbase, epnum); 1746 1747 urb = next_urb(qh); 1748 dma = is_dma_capable() ? hw_ep->rx_channel : NULL; 1749 status = 0; 1750 xfer_len = 0; 1751 1752 rx_csr = musb_readw(epio, MUSB_RXCSR); 1753 val = rx_csr; 1754 1755 if (unlikely(!urb)) { 1756 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least 1757 * usbtest #11 (unlinks) triggers it regularly, sometimes 1758 * with fifo full. (Only with DMA??) 1759 */ 1760 musb_dbg(musb, "BOGUS RX%d ready, csr %04x, count %d", 1761 epnum, val, musb_readw(epio, MUSB_RXCOUNT)); 1762 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); 1763 return; 1764 } 1765 1766 trace_musb_urb_rx(musb, urb); 1767 1768 /* check for errors, concurrent stall & unlink is not really 1769 * handled yet! */ 1770 if (rx_csr & MUSB_RXCSR_H_RXSTALL) { 1771 musb_dbg(musb, "RX end %d STALL", epnum); 1772 1773 /* stall; record URB status */ 1774 status = -EPIPE; 1775 1776 } else if (rx_csr & MUSB_RXCSR_H_ERROR) { 1777 dev_err(musb->controller, "ep%d RX three-strikes error", epnum); 1778 1779 /* 1780 * The three-strikes error could only happen when the USB 1781 * device is not accessible, for example detached or powered 1782 * off. So return the fatal error -ESHUTDOWN so hopefully the 1783 * USB device drivers won't immediately resubmit the same URB. 1784 */ 1785 status = -ESHUTDOWN; 1786 musb_writeb(epio, MUSB_RXINTERVAL, 0); 1787 1788 rx_csr &= ~MUSB_RXCSR_H_ERROR; 1789 musb_writew(epio, MUSB_RXCSR, rx_csr); 1790 1791 } else if (rx_csr & MUSB_RXCSR_DATAERROR) { 1792 1793 if (USB_ENDPOINT_XFER_ISOC != qh->type) { 1794 musb_dbg(musb, "RX end %d NAK timeout", epnum); 1795 1796 /* NOTE: NAKing is *NOT* an error, so we want to 1797 * continue. Except ... if there's a request for 1798 * another QH, use that instead of starving it. 1799 * 1800 * Devices like Ethernet and serial adapters keep 1801 * reads posted at all times, which will starve 1802 * other devices without this logic. 1803 */ 1804 if (usb_pipebulk(urb->pipe) 1805 && qh->mux == 1 1806 && !list_is_singular(&musb->in_bulk)) { 1807 musb_bulk_nak_timeout(musb, hw_ep, 1); 1808 return; 1809 } 1810 musb_ep_select(mbase, epnum); 1811 rx_csr |= MUSB_RXCSR_H_WZC_BITS; 1812 rx_csr &= ~MUSB_RXCSR_DATAERROR; 1813 musb_writew(epio, MUSB_RXCSR, rx_csr); 1814 1815 goto finish; 1816 } else { 1817 musb_dbg(musb, "RX end %d ISO data error", epnum); 1818 /* packet error reported later */ 1819 iso_err = true; 1820 } 1821 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { 1822 musb_dbg(musb, "end %d high bandwidth incomplete ISO packet RX", 1823 epnum); 1824 status = -EPROTO; 1825 } 1826 1827 /* faults abort the transfer */ 1828 if (status) { 1829 /* clean up dma and collect transfer count */ 1830 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1831 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1832 musb->dma_controller->channel_abort(dma); 1833 xfer_len = dma->actual_len; 1834 } 1835 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); 1836 musb_writeb(epio, MUSB_RXINTERVAL, 0); 1837 done = true; 1838 goto finish; 1839 } 1840 1841 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { 1842 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ 1843 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); 1844 goto finish; 1845 } 1846 1847 /* thorough shutdown for now ... given more precise fault handling 1848 * and better queueing support, we might keep a DMA pipeline going 1849 * while processing this irq for earlier completions. 1850 */ 1851 1852 /* FIXME this is _way_ too much in-line logic for Mentor DMA */ 1853 if (!musb_dma_inventra(musb) && !musb_dma_ux500(musb) && 1854 (rx_csr & MUSB_RXCSR_H_REQPKT)) { 1855 /* REVISIT this happened for a while on some short reads... 1856 * the cleanup still needs investigation... looks bad... 1857 * and also duplicates dma cleanup code above ... plus, 1858 * shouldn't this be the "half full" double buffer case? 1859 */ 1860 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1861 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1862 musb->dma_controller->channel_abort(dma); 1863 xfer_len = dma->actual_len; 1864 done = true; 1865 } 1866 1867 musb_dbg(musb, "RXCSR%d %04x, reqpkt, len %zu%s", epnum, rx_csr, 1868 xfer_len, dma ? ", dma" : ""); 1869 rx_csr &= ~MUSB_RXCSR_H_REQPKT; 1870 1871 musb_ep_select(mbase, epnum); 1872 musb_writew(epio, MUSB_RXCSR, 1873 MUSB_RXCSR_H_WZC_BITS | rx_csr); 1874 } 1875 1876 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { 1877 xfer_len = dma->actual_len; 1878 1879 val &= ~(MUSB_RXCSR_DMAENAB 1880 | MUSB_RXCSR_H_AUTOREQ 1881 | MUSB_RXCSR_AUTOCLEAR 1882 | MUSB_RXCSR_RXPKTRDY); 1883 musb_writew(hw_ep->regs, MUSB_RXCSR, val); 1884 1885 if (musb_dma_inventra(musb) || musb_dma_ux500(musb) || 1886 musb_dma_cppi41(musb)) { 1887 done = musb_rx_dma_inventra_cppi41(c, hw_ep, qh, urb, xfer_len); 1888 musb_dbg(hw_ep->musb, 1889 "ep %d dma %s, rxcsr %04x, rxcount %d", 1890 epnum, done ? "off" : "reset", 1891 musb_readw(epio, MUSB_RXCSR), 1892 musb_readw(epio, MUSB_RXCOUNT)); 1893 } else { 1894 done = true; 1895 } 1896 1897 } else if (urb->status == -EINPROGRESS) { 1898 /* if no errors, be sure a packet is ready for unloading */ 1899 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { 1900 status = -EPROTO; 1901 ERR("Rx interrupt with no errors or packet!\n"); 1902 1903 /* FIXME this is another "SHOULD NEVER HAPPEN" */ 1904 1905 /* SCRUB (RX) */ 1906 /* do the proper sequence to abort the transfer */ 1907 musb_ep_select(mbase, epnum); 1908 val &= ~MUSB_RXCSR_H_REQPKT; 1909 musb_writew(epio, MUSB_RXCSR, val); 1910 goto finish; 1911 } 1912 1913 /* we are expecting IN packets */ 1914 if ((musb_dma_inventra(musb) || musb_dma_ux500(musb) || 1915 musb_dma_cppi41(musb)) && dma) { 1916 musb_dbg(hw_ep->musb, 1917 "RX%d count %d, buffer 0x%llx len %d/%d", 1918 epnum, musb_readw(epio, MUSB_RXCOUNT), 1919 (unsigned long long) urb->transfer_dma 1920 + urb->actual_length, 1921 qh->offset, 1922 urb->transfer_buffer_length); 1923 1924 if (musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh, urb, 1925 xfer_len, iso_err)) 1926 goto finish; 1927 else 1928 dev_err(musb->controller, "error: rx_dma failed\n"); 1929 } 1930 1931 if (!dma) { 1932 unsigned int received_len; 1933 1934 /* Unmap the buffer so that CPU can use it */ 1935 usb_hcd_unmap_urb_for_dma(musb->hcd, urb); 1936 1937 /* 1938 * We need to map sg if the transfer_buffer is 1939 * NULL. 1940 */ 1941 if (!urb->transfer_buffer) { 1942 qh->use_sg = true; 1943 sg_miter_start(&qh->sg_miter, urb->sg, 1, 1944 sg_flags); 1945 } 1946 1947 if (qh->use_sg) { 1948 if (!sg_miter_next(&qh->sg_miter)) { 1949 dev_err(musb->controller, "error: sg list empty\n"); 1950 sg_miter_stop(&qh->sg_miter); 1951 status = -EINVAL; 1952 done = true; 1953 goto finish; 1954 } 1955 urb->transfer_buffer = qh->sg_miter.addr; 1956 received_len = urb->actual_length; 1957 qh->offset = 0x0; 1958 done = musb_host_packet_rx(musb, urb, epnum, 1959 iso_err); 1960 /* Calculate the number of bytes received */ 1961 received_len = urb->actual_length - 1962 received_len; 1963 qh->sg_miter.consumed = received_len; 1964 sg_miter_stop(&qh->sg_miter); 1965 } else { 1966 done = musb_host_packet_rx(musb, urb, 1967 epnum, iso_err); 1968 } 1969 musb_dbg(musb, "read %spacket", done ? "last " : ""); 1970 } 1971 } 1972 1973 finish: 1974 urb->actual_length += xfer_len; 1975 qh->offset += xfer_len; 1976 if (done) { 1977 if (qh->use_sg) { 1978 qh->use_sg = false; 1979 urb->transfer_buffer = NULL; 1980 } 1981 1982 if (urb->status == -EINPROGRESS) 1983 urb->status = status; 1984 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); 1985 } 1986 } 1987 1988 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH. 1989 * the software schedule associates multiple such nodes with a given 1990 * host side hardware endpoint + direction; scheduling may activate 1991 * that hardware endpoint. 1992 */ 1993 static int musb_schedule( 1994 struct musb *musb, 1995 struct musb_qh *qh, 1996 int is_in) 1997 { 1998 int idle = 0; 1999 int best_diff; 2000 int best_end, epnum; 2001 struct musb_hw_ep *hw_ep = NULL; 2002 struct list_head *head = NULL; 2003 u8 toggle; 2004 u8 txtype; 2005 struct urb *urb = next_urb(qh); 2006 2007 /* use fixed hardware for control and bulk */ 2008 if (qh->type == USB_ENDPOINT_XFER_CONTROL) { 2009 head = &musb->control; 2010 hw_ep = musb->control_ep; 2011 goto success; 2012 } 2013 2014 /* else, periodic transfers get muxed to other endpoints */ 2015 2016 /* 2017 * We know this qh hasn't been scheduled, so all we need to do 2018 * is choose which hardware endpoint to put it on ... 2019 * 2020 * REVISIT what we really want here is a regular schedule tree 2021 * like e.g. OHCI uses. 2022 */ 2023 best_diff = 4096; 2024 best_end = -1; 2025 2026 for (epnum = 1, hw_ep = musb->endpoints + 1; 2027 epnum < musb->nr_endpoints; 2028 epnum++, hw_ep++) { 2029 int diff; 2030 2031 if (musb_ep_get_qh(hw_ep, is_in) != NULL) 2032 continue; 2033 2034 if (hw_ep == musb->bulk_ep) 2035 continue; 2036 2037 if (is_in) 2038 diff = hw_ep->max_packet_sz_rx; 2039 else 2040 diff = hw_ep->max_packet_sz_tx; 2041 diff -= (qh->maxpacket * qh->hb_mult); 2042 2043 if (diff >= 0 && best_diff > diff) { 2044 2045 /* 2046 * Mentor controller has a bug in that if we schedule 2047 * a BULK Tx transfer on an endpoint that had earlier 2048 * handled ISOC then the BULK transfer has to start on 2049 * a zero toggle. If the BULK transfer starts on a 1 2050 * toggle then this transfer will fail as the mentor 2051 * controller starts the Bulk transfer on a 0 toggle 2052 * irrespective of the programming of the toggle bits 2053 * in the TXCSR register. Check for this condition 2054 * while allocating the EP for a Tx Bulk transfer. If 2055 * so skip this EP. 2056 */ 2057 hw_ep = musb->endpoints + epnum; 2058 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); 2059 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) 2060 >> 4) & 0x3; 2061 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && 2062 toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) 2063 continue; 2064 2065 best_diff = diff; 2066 best_end = epnum; 2067 } 2068 } 2069 /* use bulk reserved ep1 if no other ep is free */ 2070 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { 2071 hw_ep = musb->bulk_ep; 2072 if (is_in) 2073 head = &musb->in_bulk; 2074 else 2075 head = &musb->out_bulk; 2076 2077 /* Enable bulk RX/TX NAK timeout scheme when bulk requests are 2078 * multiplexed. This scheme does not work in high speed to full 2079 * speed scenario as NAK interrupts are not coming from a 2080 * full speed device connected to a high speed device. 2081 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and 2082 * 4 (8 frame or 8ms) for FS device. 2083 */ 2084 if (qh->dev) 2085 qh->intv_reg = 2086 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; 2087 goto success; 2088 } else if (best_end < 0) { 2089 dev_err(musb->controller, 2090 "%s hwep alloc failed for %dx%d\n", 2091 musb_ep_xfertype_string(qh->type), 2092 qh->hb_mult, qh->maxpacket); 2093 return -ENOSPC; 2094 } 2095 2096 idle = 1; 2097 qh->mux = 0; 2098 hw_ep = musb->endpoints + best_end; 2099 musb_dbg(musb, "qh %p periodic slot %d", qh, best_end); 2100 success: 2101 if (head) { 2102 idle = list_empty(head); 2103 list_add_tail(&qh->ring, head); 2104 qh->mux = 1; 2105 } 2106 qh->hw_ep = hw_ep; 2107 qh->hep->hcpriv = qh; 2108 if (idle) 2109 musb_start_urb(musb, is_in, qh); 2110 return 0; 2111 } 2112 2113 static int musb_urb_enqueue( 2114 struct usb_hcd *hcd, 2115 struct urb *urb, 2116 gfp_t mem_flags) 2117 { 2118 unsigned long flags; 2119 struct musb *musb = hcd_to_musb(hcd); 2120 struct usb_host_endpoint *hep = urb->ep; 2121 struct musb_qh *qh; 2122 struct usb_endpoint_descriptor *epd = &hep->desc; 2123 int ret; 2124 unsigned type_reg; 2125 unsigned interval; 2126 2127 /* host role must be active */ 2128 if (!is_host_active(musb) || !musb->is_active) 2129 return -ENODEV; 2130 2131 trace_musb_urb_enq(musb, urb); 2132 2133 spin_lock_irqsave(&musb->lock, flags); 2134 ret = usb_hcd_link_urb_to_ep(hcd, urb); 2135 qh = ret ? NULL : hep->hcpriv; 2136 if (qh) 2137 urb->hcpriv = qh; 2138 spin_unlock_irqrestore(&musb->lock, flags); 2139 2140 /* DMA mapping was already done, if needed, and this urb is on 2141 * hep->urb_list now ... so we're done, unless hep wasn't yet 2142 * scheduled onto a live qh. 2143 * 2144 * REVISIT best to keep hep->hcpriv valid until the endpoint gets 2145 * disabled, testing for empty qh->ring and avoiding qh setup costs 2146 * except for the first urb queued after a config change. 2147 */ 2148 if (qh || ret) 2149 return ret; 2150 2151 /* Allocate and initialize qh, minimizing the work done each time 2152 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. 2153 * 2154 * REVISIT consider a dedicated qh kmem_cache, so it's harder 2155 * for bugs in other kernel code to break this driver... 2156 */ 2157 qh = kzalloc(sizeof *qh, mem_flags); 2158 if (!qh) { 2159 spin_lock_irqsave(&musb->lock, flags); 2160 usb_hcd_unlink_urb_from_ep(hcd, urb); 2161 spin_unlock_irqrestore(&musb->lock, flags); 2162 return -ENOMEM; 2163 } 2164 2165 qh->hep = hep; 2166 qh->dev = urb->dev; 2167 INIT_LIST_HEAD(&qh->ring); 2168 qh->is_ready = 1; 2169 2170 qh->maxpacket = usb_endpoint_maxp(epd); 2171 qh->type = usb_endpoint_type(epd); 2172 2173 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. 2174 * Some musb cores don't support high bandwidth ISO transfers; and 2175 * we don't (yet!) support high bandwidth interrupt transfers. 2176 */ 2177 qh->hb_mult = usb_endpoint_maxp_mult(epd); 2178 if (qh->hb_mult > 1) { 2179 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); 2180 2181 if (ok) 2182 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) 2183 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); 2184 if (!ok) { 2185 dev_err(musb->controller, 2186 "high bandwidth %s (%dx%d) not supported\n", 2187 musb_ep_xfertype_string(qh->type), 2188 qh->hb_mult, qh->maxpacket & 0x7ff); 2189 ret = -EMSGSIZE; 2190 goto done; 2191 } 2192 qh->maxpacket &= 0x7ff; 2193 } 2194 2195 qh->epnum = usb_endpoint_num(epd); 2196 2197 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ 2198 qh->addr_reg = (u8) usb_pipedevice(urb->pipe); 2199 2200 /* precompute rxtype/txtype/type0 register */ 2201 type_reg = (qh->type << 4) | qh->epnum; 2202 switch (urb->dev->speed) { 2203 case USB_SPEED_LOW: 2204 type_reg |= 0xc0; 2205 break; 2206 case USB_SPEED_FULL: 2207 type_reg |= 0x80; 2208 break; 2209 default: 2210 type_reg |= 0x40; 2211 } 2212 qh->type_reg = type_reg; 2213 2214 /* Precompute RXINTERVAL/TXINTERVAL register */ 2215 switch (qh->type) { 2216 case USB_ENDPOINT_XFER_INT: 2217 /* 2218 * Full/low speeds use the linear encoding, 2219 * high speed uses the logarithmic encoding. 2220 */ 2221 if (urb->dev->speed <= USB_SPEED_FULL) { 2222 interval = max_t(u8, epd->bInterval, 1); 2223 break; 2224 } 2225 fallthrough; 2226 case USB_ENDPOINT_XFER_ISOC: 2227 /* ISO always uses logarithmic encoding */ 2228 interval = min_t(u8, epd->bInterval, 16); 2229 break; 2230 default: 2231 /* REVISIT we actually want to use NAK limits, hinting to the 2232 * transfer scheduling logic to try some other qh, e.g. try 2233 * for 2 msec first: 2234 * 2235 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; 2236 * 2237 * The downside of disabling this is that transfer scheduling 2238 * gets VERY unfair for nonperiodic transfers; a misbehaving 2239 * peripheral could make that hurt. That's perfectly normal 2240 * for reads from network or serial adapters ... so we have 2241 * partial NAKlimit support for bulk RX. 2242 * 2243 * The upside of disabling it is simpler transfer scheduling. 2244 */ 2245 interval = 0; 2246 } 2247 qh->intv_reg = interval; 2248 2249 /* precompute addressing for external hub/tt ports */ 2250 if (musb->is_multipoint) { 2251 struct usb_device *parent = urb->dev->parent; 2252 2253 if (parent != hcd->self.root_hub) { 2254 qh->h_addr_reg = (u8) parent->devnum; 2255 2256 /* set up tt info if needed */ 2257 if (urb->dev->tt) { 2258 qh->h_port_reg = (u8) urb->dev->ttport; 2259 if (urb->dev->tt->hub) 2260 qh->h_addr_reg = 2261 (u8) urb->dev->tt->hub->devnum; 2262 if (urb->dev->tt->multi) 2263 qh->h_addr_reg |= 0x80; 2264 } 2265 } 2266 } 2267 2268 /* invariant: hep->hcpriv is null OR the qh that's already scheduled. 2269 * until we get real dma queues (with an entry for each urb/buffer), 2270 * we only have work to do in the former case. 2271 */ 2272 spin_lock_irqsave(&musb->lock, flags); 2273 if (hep->hcpriv || !next_urb(qh)) { 2274 /* some concurrent activity submitted another urb to hep... 2275 * odd, rare, error prone, but legal. 2276 */ 2277 kfree(qh); 2278 qh = NULL; 2279 ret = 0; 2280 } else 2281 ret = musb_schedule(musb, qh, 2282 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); 2283 2284 if (ret == 0) { 2285 urb->hcpriv = qh; 2286 /* FIXME set urb->start_frame for iso/intr, it's tested in 2287 * musb_start_urb(), but otherwise only konicawc cares ... 2288 */ 2289 } 2290 spin_unlock_irqrestore(&musb->lock, flags); 2291 2292 done: 2293 if (ret != 0) { 2294 spin_lock_irqsave(&musb->lock, flags); 2295 usb_hcd_unlink_urb_from_ep(hcd, urb); 2296 spin_unlock_irqrestore(&musb->lock, flags); 2297 kfree(qh); 2298 } 2299 return ret; 2300 } 2301 2302 2303 /* 2304 * abort a transfer that's at the head of a hardware queue. 2305 * called with controller locked, irqs blocked 2306 * that hardware queue advances to the next transfer, unless prevented 2307 */ 2308 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) 2309 { 2310 struct musb_hw_ep *ep = qh->hw_ep; 2311 struct musb *musb = ep->musb; 2312 void __iomem *epio = ep->regs; 2313 unsigned hw_end = ep->epnum; 2314 void __iomem *regs = ep->musb->mregs; 2315 int is_in = usb_pipein(urb->pipe); 2316 int status = 0; 2317 u16 csr; 2318 struct dma_channel *dma = NULL; 2319 2320 musb_ep_select(regs, hw_end); 2321 2322 if (is_dma_capable()) { 2323 dma = is_in ? ep->rx_channel : ep->tx_channel; 2324 if (dma) { 2325 status = ep->musb->dma_controller->channel_abort(dma); 2326 musb_dbg(musb, "abort %cX%d DMA for urb %p --> %d", 2327 is_in ? 'R' : 'T', ep->epnum, 2328 urb, status); 2329 urb->actual_length += dma->actual_len; 2330 } 2331 } 2332 2333 /* turn off DMA requests, discard state, stop polling ... */ 2334 if (ep->epnum && is_in) { 2335 /* giveback saves bulk toggle */ 2336 csr = musb_h_flush_rxfifo(ep, 0); 2337 2338 /* clear the endpoint's irq status here to avoid bogus irqs */ 2339 if (is_dma_capable() && dma) 2340 musb_platform_clear_ep_rxintr(musb, ep->epnum); 2341 } else if (ep->epnum) { 2342 musb_h_tx_flush_fifo(ep); 2343 csr = musb_readw(epio, MUSB_TXCSR); 2344 csr &= ~(MUSB_TXCSR_AUTOSET 2345 | MUSB_TXCSR_DMAENAB 2346 | MUSB_TXCSR_H_RXSTALL 2347 | MUSB_TXCSR_H_NAKTIMEOUT 2348 | MUSB_TXCSR_H_ERROR 2349 | MUSB_TXCSR_TXPKTRDY); 2350 musb_writew(epio, MUSB_TXCSR, csr); 2351 /* REVISIT may need to clear FLUSHFIFO ... */ 2352 musb_writew(epio, MUSB_TXCSR, csr); 2353 /* flush cpu writebuffer */ 2354 csr = musb_readw(epio, MUSB_TXCSR); 2355 } else { 2356 musb_h_ep0_flush_fifo(ep); 2357 } 2358 if (status == 0) 2359 musb_advance_schedule(ep->musb, urb, ep, is_in); 2360 return status; 2361 } 2362 2363 static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 2364 { 2365 struct musb *musb = hcd_to_musb(hcd); 2366 struct musb_qh *qh; 2367 unsigned long flags; 2368 int is_in = usb_pipein(urb->pipe); 2369 int ret; 2370 2371 trace_musb_urb_deq(musb, urb); 2372 2373 spin_lock_irqsave(&musb->lock, flags); 2374 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 2375 if (ret) 2376 goto done; 2377 2378 qh = urb->hcpriv; 2379 if (!qh) 2380 goto done; 2381 2382 /* 2383 * Any URB not actively programmed into endpoint hardware can be 2384 * immediately given back; that's any URB not at the head of an 2385 * endpoint queue, unless someday we get real DMA queues. And even 2386 * if it's at the head, it might not be known to the hardware... 2387 * 2388 * Otherwise abort current transfer, pending DMA, etc.; urb->status 2389 * has already been updated. This is a synchronous abort; it'd be 2390 * OK to hold off until after some IRQ, though. 2391 * 2392 * NOTE: qh is invalid unless !list_empty(&hep->urb_list) 2393 */ 2394 if (!qh->is_ready 2395 || urb->urb_list.prev != &qh->hep->urb_list 2396 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { 2397 int ready = qh->is_ready; 2398 2399 qh->is_ready = 0; 2400 musb_giveback(musb, urb, 0); 2401 qh->is_ready = ready; 2402 2403 /* If nothing else (usually musb_giveback) is using it 2404 * and its URB list has emptied, recycle this qh. 2405 */ 2406 if (ready && list_empty(&qh->hep->urb_list)) { 2407 musb_ep_set_qh(qh->hw_ep, is_in, NULL); 2408 qh->hep->hcpriv = NULL; 2409 list_del(&qh->ring); 2410 kfree(qh); 2411 } 2412 } else 2413 ret = musb_cleanup_urb(urb, qh); 2414 done: 2415 spin_unlock_irqrestore(&musb->lock, flags); 2416 return ret; 2417 } 2418 2419 /* disable an endpoint */ 2420 static void 2421 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) 2422 { 2423 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; 2424 unsigned long flags; 2425 struct musb *musb = hcd_to_musb(hcd); 2426 struct musb_qh *qh; 2427 struct urb *urb; 2428 2429 spin_lock_irqsave(&musb->lock, flags); 2430 2431 qh = hep->hcpriv; 2432 if (qh == NULL) 2433 goto exit; 2434 2435 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ 2436 2437 /* Kick the first URB off the hardware, if needed */ 2438 qh->is_ready = 0; 2439 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { 2440 urb = next_urb(qh); 2441 2442 /* make software (then hardware) stop ASAP */ 2443 if (!urb->unlinked) 2444 urb->status = -ESHUTDOWN; 2445 2446 /* cleanup */ 2447 musb_cleanup_urb(urb, qh); 2448 2449 /* Then nuke all the others ... and advance the 2450 * queue on hw_ep (e.g. bulk ring) when we're done. 2451 */ 2452 while (!list_empty(&hep->urb_list)) { 2453 urb = next_urb(qh); 2454 urb->status = -ESHUTDOWN; 2455 musb_advance_schedule(musb, urb, qh->hw_ep, is_in); 2456 } 2457 } else { 2458 /* Just empty the queue; the hardware is busy with 2459 * other transfers, and since !qh->is_ready nothing 2460 * will activate any of these as it advances. 2461 */ 2462 while (!list_empty(&hep->urb_list)) 2463 musb_giveback(musb, next_urb(qh), -ESHUTDOWN); 2464 2465 hep->hcpriv = NULL; 2466 list_del(&qh->ring); 2467 kfree(qh); 2468 } 2469 exit: 2470 spin_unlock_irqrestore(&musb->lock, flags); 2471 } 2472 2473 static int musb_h_get_frame_number(struct usb_hcd *hcd) 2474 { 2475 struct musb *musb = hcd_to_musb(hcd); 2476 2477 return musb_readw(musb->mregs, MUSB_FRAME); 2478 } 2479 2480 static int musb_h_start(struct usb_hcd *hcd) 2481 { 2482 struct musb *musb = hcd_to_musb(hcd); 2483 2484 /* NOTE: musb_start() is called when the hub driver turns 2485 * on port power, or when (OTG) peripheral starts. 2486 */ 2487 hcd->state = HC_STATE_RUNNING; 2488 musb->port1_status = 0; 2489 return 0; 2490 } 2491 2492 static void musb_h_stop(struct usb_hcd *hcd) 2493 { 2494 musb_stop(hcd_to_musb(hcd)); 2495 hcd->state = HC_STATE_HALT; 2496 } 2497 2498 static int musb_bus_suspend(struct usb_hcd *hcd) 2499 { 2500 struct musb *musb = hcd_to_musb(hcd); 2501 u8 devctl; 2502 int ret; 2503 2504 ret = musb_port_suspend(musb, true); 2505 if (ret) 2506 return ret; 2507 2508 if (!is_host_active(musb)) 2509 return 0; 2510 2511 switch (musb_get_state(musb)) { 2512 case OTG_STATE_A_SUSPEND: 2513 return 0; 2514 case OTG_STATE_A_WAIT_VRISE: 2515 /* ID could be grounded even if there's no device 2516 * on the other end of the cable. NOTE that the 2517 * A_WAIT_VRISE timers are messy with MUSB... 2518 */ 2519 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2520 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) 2521 musb_set_state(musb, OTG_STATE_A_WAIT_BCON); 2522 break; 2523 default: 2524 break; 2525 } 2526 2527 if (musb->is_active) { 2528 WARNING("trying to suspend as %s while active\n", 2529 musb_otg_state_string(musb)); 2530 return -EBUSY; 2531 } else 2532 return 0; 2533 } 2534 2535 static int musb_bus_resume(struct usb_hcd *hcd) 2536 { 2537 struct musb *musb = hcd_to_musb(hcd); 2538 2539 if (musb->config && 2540 musb->config->host_port_deassert_reset_at_resume) 2541 musb_port_reset(musb, false); 2542 2543 return 0; 2544 } 2545 2546 #ifndef CONFIG_MUSB_PIO_ONLY 2547 2548 #define MUSB_USB_DMA_ALIGN 4 2549 2550 struct musb_temp_buffer { 2551 void *kmalloc_ptr; 2552 void *old_xfer_buffer; 2553 u8 data[]; 2554 }; 2555 2556 static void musb_free_temp_buffer(struct urb *urb) 2557 { 2558 enum dma_data_direction dir; 2559 struct musb_temp_buffer *temp; 2560 size_t length; 2561 2562 if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) 2563 return; 2564 2565 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 2566 2567 temp = container_of(urb->transfer_buffer, struct musb_temp_buffer, 2568 data); 2569 2570 if (dir == DMA_FROM_DEVICE) { 2571 if (usb_pipeisoc(urb->pipe)) 2572 length = urb->transfer_buffer_length; 2573 else 2574 length = urb->actual_length; 2575 2576 memcpy(temp->old_xfer_buffer, temp->data, length); 2577 } 2578 urb->transfer_buffer = temp->old_xfer_buffer; 2579 kfree(temp->kmalloc_ptr); 2580 2581 urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; 2582 } 2583 2584 static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags) 2585 { 2586 enum dma_data_direction dir; 2587 struct musb_temp_buffer *temp; 2588 void *kmalloc_ptr; 2589 size_t kmalloc_size; 2590 2591 if (urb->num_sgs || urb->sg || 2592 urb->transfer_buffer_length == 0 || 2593 !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1))) 2594 return 0; 2595 2596 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 2597 2598 /* Allocate a buffer with enough padding for alignment */ 2599 kmalloc_size = urb->transfer_buffer_length + 2600 sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1; 2601 2602 kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); 2603 if (!kmalloc_ptr) 2604 return -ENOMEM; 2605 2606 /* Position our struct temp_buffer such that data is aligned */ 2607 temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN); 2608 2609 2610 temp->kmalloc_ptr = kmalloc_ptr; 2611 temp->old_xfer_buffer = urb->transfer_buffer; 2612 if (dir == DMA_TO_DEVICE) 2613 memcpy(temp->data, urb->transfer_buffer, 2614 urb->transfer_buffer_length); 2615 urb->transfer_buffer = temp->data; 2616 2617 urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; 2618 2619 return 0; 2620 } 2621 2622 static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, 2623 gfp_t mem_flags) 2624 { 2625 struct musb *musb = hcd_to_musb(hcd); 2626 int ret; 2627 2628 /* 2629 * The DMA engine in RTL1.8 and above cannot handle 2630 * DMA addresses that are not aligned to a 4 byte boundary. 2631 * For such engine implemented (un)map_urb_for_dma hooks. 2632 * Do not use these hooks for RTL<1.8 2633 */ 2634 if (musb->hwvers < MUSB_HWVERS_1800) 2635 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); 2636 2637 ret = musb_alloc_temp_buffer(urb, mem_flags); 2638 if (ret) 2639 return ret; 2640 2641 ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); 2642 if (ret) 2643 musb_free_temp_buffer(urb); 2644 2645 return ret; 2646 } 2647 2648 static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) 2649 { 2650 struct musb *musb = hcd_to_musb(hcd); 2651 2652 usb_hcd_unmap_urb_for_dma(hcd, urb); 2653 2654 /* Do not use this hook for RTL<1.8 (see description above) */ 2655 if (musb->hwvers < MUSB_HWVERS_1800) 2656 return; 2657 2658 musb_free_temp_buffer(urb); 2659 } 2660 #endif /* !CONFIG_MUSB_PIO_ONLY */ 2661 2662 static const struct hc_driver musb_hc_driver = { 2663 .description = "musb-hcd", 2664 .product_desc = "MUSB HDRC host driver", 2665 .hcd_priv_size = sizeof(struct musb *), 2666 .flags = HCD_USB2 | HCD_DMA | HCD_MEMORY, 2667 2668 /* not using irq handler or reset hooks from usbcore, since 2669 * those must be shared with peripheral code for OTG configs 2670 */ 2671 2672 .start = musb_h_start, 2673 .stop = musb_h_stop, 2674 2675 .get_frame_number = musb_h_get_frame_number, 2676 2677 .urb_enqueue = musb_urb_enqueue, 2678 .urb_dequeue = musb_urb_dequeue, 2679 .endpoint_disable = musb_h_disable, 2680 2681 #ifndef CONFIG_MUSB_PIO_ONLY 2682 .map_urb_for_dma = musb_map_urb_for_dma, 2683 .unmap_urb_for_dma = musb_unmap_urb_for_dma, 2684 #endif 2685 2686 .hub_status_data = musb_hub_status_data, 2687 .hub_control = musb_hub_control, 2688 .bus_suspend = musb_bus_suspend, 2689 .bus_resume = musb_bus_resume, 2690 /* .start_port_reset = NULL, */ 2691 /* .hub_irq_enable = NULL, */ 2692 }; 2693 2694 int musb_host_alloc(struct musb *musb) 2695 { 2696 struct device *dev = musb->controller; 2697 2698 /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */ 2699 musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev)); 2700 if (!musb->hcd) 2701 return -EINVAL; 2702 2703 *musb->hcd->hcd_priv = (unsigned long) musb; 2704 musb->hcd->self.uses_pio_for_control = 1; 2705 musb->hcd->uses_new_polling = 1; 2706 musb->hcd->has_tt = 1; 2707 2708 return 0; 2709 } 2710 2711 void musb_host_cleanup(struct musb *musb) 2712 { 2713 if (musb->port_mode == MUSB_PERIPHERAL) 2714 return; 2715 usb_remove_hcd(musb->hcd); 2716 } 2717 2718 void musb_host_free(struct musb *musb) 2719 { 2720 usb_put_hcd(musb->hcd); 2721 } 2722 2723 int musb_host_setup(struct musb *musb, int power_budget) 2724 { 2725 int ret; 2726 struct usb_hcd *hcd = musb->hcd; 2727 2728 if (musb->port_mode == MUSB_HOST) { 2729 MUSB_HST_MODE(musb); 2730 musb_set_state(musb, OTG_STATE_A_IDLE); 2731 } 2732 2733 if (musb->xceiv) { 2734 otg_set_host(musb->xceiv->otg, &hcd->self); 2735 musb->xceiv->otg->host = &hcd->self; 2736 } else { 2737 phy_set_mode(musb->phy, PHY_MODE_USB_HOST); 2738 } 2739 2740 /* don't support otg protocols */ 2741 hcd->self.otg_port = 0; 2742 hcd->power_budget = 2 * (power_budget ? : 250); 2743 hcd->skip_phy_initialization = 1; 2744 2745 ret = usb_add_hcd(hcd, 0, 0); 2746 if (ret < 0) 2747 return ret; 2748 2749 device_wakeup_enable(hcd->self.controller); 2750 return 0; 2751 } 2752 2753 void musb_host_resume_root_hub(struct musb *musb) 2754 { 2755 usb_hcd_resume_root_hub(musb->hcd); 2756 } 2757 2758 void musb_host_poke_root_hub(struct musb *musb) 2759 { 2760 MUSB_HST_MODE(musb); 2761 if (musb->hcd->status_urb) 2762 usb_hcd_poll_rh_status(musb->hcd); 2763 else 2764 usb_hcd_resume_root_hub(musb->hcd); 2765 } 2766