1 /* 2 * MUSB OTG driver host support 3 * 4 * Copyright 2005 Mentor Graphics Corporation 5 * Copyright (C) 2005-2006 by Texas Instruments 6 * Copyright (C) 2006-2007 Nokia Corporation 7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * version 2 as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 21 * 02110-1301 USA 22 * 23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 */ 35 36 #ifndef __UBOOT__ 37 #include <linux/module.h> 38 #include <linux/kernel.h> 39 #include <linux/delay.h> 40 #include <linux/sched.h> 41 #include <linux/slab.h> 42 #include <linux/errno.h> 43 #include <linux/init.h> 44 #include <linux/list.h> 45 #include <linux/dma-mapping.h> 46 #else 47 #include <common.h> 48 #include <usb.h> 49 #include "linux-compat.h" 50 #include "usb-compat.h" 51 #endif 52 53 #include "musb_core.h" 54 #include "musb_host.h" 55 56 57 /* MUSB HOST status 22-mar-2006 58 * 59 * - There's still lots of partial code duplication for fault paths, so 60 * they aren't handled as consistently as they need to be. 61 * 62 * - PIO mostly behaved when last tested. 63 * + including ep0, with all usbtest cases 9, 10 64 * + usbtest 14 (ep0out) doesn't seem to run at all 65 * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest 66 * configurations, but otherwise double buffering passes basic tests. 67 * + for 2.6.N, for N > ~10, needs API changes for hcd framework. 68 * 69 * - DMA (CPPI) ... partially behaves, not currently recommended 70 * + about 1/15 the speed of typical EHCI implementations (PCI) 71 * + RX, all too often reqpkt seems to misbehave after tx 72 * + TX, no known issues (other than evident silicon issue) 73 * 74 * - DMA (Mentor/OMAP) ...has at least toggle update problems 75 * 76 * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet 77 * starvation ... nothing yet for TX, interrupt, or bulk. 78 * 79 * - Not tested with HNP, but some SRP paths seem to behave. 80 * 81 * NOTE 24-August-2006: 82 * 83 * - Bulk traffic finally uses both sides of hardware ep1, freeing up an 84 * extra endpoint for periodic use enabling hub + keybd + mouse. That 85 * mostly works, except that with "usbnet" it's easy to trigger cases 86 * with "ping" where RX loses. (a) ping to davinci, even "ping -f", 87 * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses 88 * although ARP RX wins. (That test was done with a full speed link.) 89 */ 90 91 92 /* 93 * NOTE on endpoint usage: 94 * 95 * CONTROL transfers all go through ep0. BULK ones go through dedicated IN 96 * and OUT endpoints ... hardware is dedicated for those "async" queue(s). 97 * (Yes, bulk _could_ use more of the endpoints than that, and would even 98 * benefit from it.) 99 * 100 * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. 101 * So far that scheduling is both dumb and optimistic: the endpoint will be 102 * "claimed" until its software queue is no longer refilled. No multiplexing 103 * of transfers between endpoints, or anything clever. 104 */ 105 106 107 static void musb_ep_program(struct musb *musb, u8 epnum, 108 struct urb *urb, int is_out, 109 u8 *buf, u32 offset, u32 len); 110 111 /* 112 * Clear TX fifo. Needed to avoid BABBLE errors. 113 */ 114 static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) 115 { 116 struct musb *musb = ep->musb; 117 void __iomem *epio = ep->regs; 118 u16 csr; 119 u16 lastcsr = 0; 120 int retries = 1000; 121 122 csr = musb_readw(epio, MUSB_TXCSR); 123 while (csr & MUSB_TXCSR_FIFONOTEMPTY) { 124 if (csr != lastcsr) 125 dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr); 126 lastcsr = csr; 127 csr |= MUSB_TXCSR_FLUSHFIFO; 128 musb_writew(epio, MUSB_TXCSR, csr); 129 csr = musb_readw(epio, MUSB_TXCSR); 130 if (WARN(retries-- < 1, 131 "Could not flush host TX%d fifo: csr: %04x\n", 132 ep->epnum, csr)) 133 return; 134 mdelay(1); 135 } 136 } 137 138 static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) 139 { 140 void __iomem *epio = ep->regs; 141 u16 csr; 142 int retries = 5; 143 144 /* scrub any data left in the fifo */ 145 do { 146 csr = musb_readw(epio, MUSB_TXCSR); 147 if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) 148 break; 149 musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); 150 csr = musb_readw(epio, MUSB_TXCSR); 151 udelay(10); 152 } while (--retries); 153 154 WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", 155 ep->epnum, csr); 156 157 /* and reset for the next transfer */ 158 musb_writew(epio, MUSB_TXCSR, 0); 159 } 160 161 /* 162 * Start transmit. Caller is responsible for locking shared resources. 163 * musb must be locked. 164 */ 165 static inline void musb_h_tx_start(struct musb_hw_ep *ep) 166 { 167 u16 txcsr; 168 169 /* NOTE: no locks here; caller should lock and select EP */ 170 if (ep->epnum) { 171 txcsr = musb_readw(ep->regs, MUSB_TXCSR); 172 txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; 173 musb_writew(ep->regs, MUSB_TXCSR, txcsr); 174 } else { 175 txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; 176 musb_writew(ep->regs, MUSB_CSR0, txcsr); 177 } 178 179 } 180 181 static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) 182 { 183 u16 txcsr; 184 185 /* NOTE: no locks here; caller should lock and select EP */ 186 txcsr = musb_readw(ep->regs, MUSB_TXCSR); 187 txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; 188 if (is_cppi_enabled()) 189 txcsr |= MUSB_TXCSR_DMAMODE; 190 musb_writew(ep->regs, MUSB_TXCSR, txcsr); 191 } 192 193 static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) 194 { 195 if (is_in != 0 || ep->is_shared_fifo) 196 ep->in_qh = qh; 197 if (is_in == 0 || ep->is_shared_fifo) 198 ep->out_qh = qh; 199 } 200 201 static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) 202 { 203 return is_in ? ep->in_qh : ep->out_qh; 204 } 205 206 /* 207 * Start the URB at the front of an endpoint's queue 208 * end must be claimed from the caller. 209 * 210 * Context: controller locked, irqs blocked 211 */ 212 static void 213 musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) 214 { 215 u16 frame; 216 u32 len; 217 void __iomem *mbase = musb->mregs; 218 struct urb *urb = next_urb(qh); 219 void *buf = urb->transfer_buffer; 220 u32 offset = 0; 221 struct musb_hw_ep *hw_ep = qh->hw_ep; 222 unsigned pipe = urb->pipe; 223 u8 address = usb_pipedevice(pipe); 224 int epnum = hw_ep->epnum; 225 226 /* initialize software qh state */ 227 qh->offset = 0; 228 qh->segsize = 0; 229 230 /* gather right source of data */ 231 switch (qh->type) { 232 case USB_ENDPOINT_XFER_CONTROL: 233 /* control transfers always start with SETUP */ 234 is_in = 0; 235 musb->ep0_stage = MUSB_EP0_START; 236 buf = urb->setup_packet; 237 len = 8; 238 break; 239 #ifndef __UBOOT__ 240 case USB_ENDPOINT_XFER_ISOC: 241 qh->iso_idx = 0; 242 qh->frame = 0; 243 offset = urb->iso_frame_desc[0].offset; 244 len = urb->iso_frame_desc[0].length; 245 break; 246 #endif 247 default: /* bulk, interrupt */ 248 /* actual_length may be nonzero on retry paths */ 249 buf = urb->transfer_buffer + urb->actual_length; 250 len = urb->transfer_buffer_length - urb->actual_length; 251 } 252 253 dev_dbg(musb->controller, "qh %p urb %p dev%d ep%d%s%s, hw_ep %d, %p/%d\n", 254 qh, urb, address, qh->epnum, 255 is_in ? "in" : "out", 256 ({char *s; switch (qh->type) { 257 case USB_ENDPOINT_XFER_CONTROL: s = ""; break; 258 case USB_ENDPOINT_XFER_BULK: s = "-bulk"; break; 259 #ifndef __UBOOT__ 260 case USB_ENDPOINT_XFER_ISOC: s = "-iso"; break; 261 #endif 262 default: s = "-intr"; break; 263 }; s; }), 264 epnum, buf + offset, len); 265 266 /* Configure endpoint */ 267 musb_ep_set_qh(hw_ep, is_in, qh); 268 musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); 269 270 /* transmit may have more work: start it when it is time */ 271 if (is_in) 272 return; 273 274 /* determine if the time is right for a periodic transfer */ 275 switch (qh->type) { 276 #ifndef __UBOOT__ 277 case USB_ENDPOINT_XFER_ISOC: 278 #endif 279 case USB_ENDPOINT_XFER_INT: 280 dev_dbg(musb->controller, "check whether there's still time for periodic Tx\n"); 281 frame = musb_readw(mbase, MUSB_FRAME); 282 /* FIXME this doesn't implement that scheduling policy ... 283 * or handle framecounter wrapping 284 */ 285 #ifndef __UBOOT__ 286 if ((urb->transfer_flags & URB_ISO_ASAP) 287 || (frame >= urb->start_frame)) { 288 /* REVISIT the SOF irq handler shouldn't duplicate 289 * this code; and we don't init urb->start_frame... 290 */ 291 qh->frame = 0; 292 goto start; 293 } else { 294 #endif 295 qh->frame = urb->start_frame; 296 /* enable SOF interrupt so we can count down */ 297 dev_dbg(musb->controller, "SOF for %d\n", epnum); 298 #if 1 /* ifndef CONFIG_ARCH_DAVINCI */ 299 musb_writeb(mbase, MUSB_INTRUSBE, 0xff); 300 #endif 301 #ifndef __UBOOT__ 302 } 303 #endif 304 break; 305 default: 306 start: 307 dev_dbg(musb->controller, "Start TX%d %s\n", epnum, 308 hw_ep->tx_channel ? "dma" : "pio"); 309 310 if (!hw_ep->tx_channel) 311 musb_h_tx_start(hw_ep); 312 else if (is_cppi_enabled() || tusb_dma_omap()) 313 musb_h_tx_dma_start(hw_ep); 314 } 315 } 316 317 /* Context: caller owns controller lock, IRQs are blocked */ 318 static void musb_giveback(struct musb *musb, struct urb *urb, int status) 319 __releases(musb->lock) 320 __acquires(musb->lock) 321 { 322 dev_dbg(musb->controller, 323 "complete %p %pF (%d), dev%d ep%d%s, %d/%d\n", 324 urb, urb->complete, status, 325 usb_pipedevice(urb->pipe), 326 usb_pipeendpoint(urb->pipe), 327 usb_pipein(urb->pipe) ? "in" : "out", 328 urb->actual_length, urb->transfer_buffer_length 329 ); 330 331 usb_hcd_unlink_urb_from_ep(musb_to_hcd(musb), urb); 332 spin_unlock(&musb->lock); 333 usb_hcd_giveback_urb(musb_to_hcd(musb), urb, status); 334 spin_lock(&musb->lock); 335 } 336 337 /* For bulk/interrupt endpoints only */ 338 static inline void musb_save_toggle(struct musb_qh *qh, int is_in, 339 struct urb *urb) 340 { 341 void __iomem *epio = qh->hw_ep->regs; 342 u16 csr; 343 344 /* 345 * FIXME: the current Mentor DMA code seems to have 346 * problems getting toggle correct. 347 */ 348 349 if (is_in) 350 csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; 351 else 352 csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; 353 354 usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0); 355 } 356 357 /* 358 * Advance this hardware endpoint's queue, completing the specified URB and 359 * advancing to either the next URB queued to that qh, or else invalidating 360 * that qh and advancing to the next qh scheduled after the current one. 361 * 362 * Context: caller owns controller lock, IRQs are blocked 363 */ 364 static void musb_advance_schedule(struct musb *musb, struct urb *urb, 365 struct musb_hw_ep *hw_ep, int is_in) 366 { 367 struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); 368 struct musb_hw_ep *ep = qh->hw_ep; 369 int ready = qh->is_ready; 370 int status; 371 372 status = (urb->status == -EINPROGRESS) ? 0 : urb->status; 373 374 /* save toggle eagerly, for paranoia */ 375 switch (qh->type) { 376 case USB_ENDPOINT_XFER_BULK: 377 case USB_ENDPOINT_XFER_INT: 378 musb_save_toggle(qh, is_in, urb); 379 break; 380 #ifndef __UBOOT__ 381 case USB_ENDPOINT_XFER_ISOC: 382 if (status == 0 && urb->error_count) 383 status = -EXDEV; 384 break; 385 #endif 386 } 387 388 qh->is_ready = 0; 389 musb_giveback(musb, urb, status); 390 qh->is_ready = ready; 391 392 /* reclaim resources (and bandwidth) ASAP; deschedule it, and 393 * invalidate qh as soon as list_empty(&hep->urb_list) 394 */ 395 if (list_empty(&qh->hep->urb_list)) { 396 struct list_head *head; 397 struct dma_controller *dma = musb->dma_controller; 398 399 if (is_in) { 400 ep->rx_reinit = 1; 401 if (ep->rx_channel) { 402 dma->channel_release(ep->rx_channel); 403 ep->rx_channel = NULL; 404 } 405 } else { 406 ep->tx_reinit = 1; 407 if (ep->tx_channel) { 408 dma->channel_release(ep->tx_channel); 409 ep->tx_channel = NULL; 410 } 411 } 412 413 /* Clobber old pointers to this qh */ 414 musb_ep_set_qh(ep, is_in, NULL); 415 qh->hep->hcpriv = NULL; 416 417 switch (qh->type) { 418 419 case USB_ENDPOINT_XFER_CONTROL: 420 case USB_ENDPOINT_XFER_BULK: 421 /* fifo policy for these lists, except that NAKing 422 * should rotate a qh to the end (for fairness). 423 */ 424 if (qh->mux == 1) { 425 head = qh->ring.prev; 426 list_del(&qh->ring); 427 kfree(qh); 428 qh = first_qh(head); 429 break; 430 } 431 432 case USB_ENDPOINT_XFER_ISOC: 433 case USB_ENDPOINT_XFER_INT: 434 /* this is where periodic bandwidth should be 435 * de-allocated if it's tracked and allocated; 436 * and where we'd update the schedule tree... 437 */ 438 kfree(qh); 439 qh = NULL; 440 break; 441 } 442 } 443 444 if (qh != NULL && qh->is_ready) { 445 dev_dbg(musb->controller, "... next ep%d %cX urb %p\n", 446 hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); 447 musb_start_urb(musb, is_in, qh); 448 } 449 } 450 451 static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) 452 { 453 /* we don't want fifo to fill itself again; 454 * ignore dma (various models), 455 * leave toggle alone (may not have been saved yet) 456 */ 457 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; 458 csr &= ~(MUSB_RXCSR_H_REQPKT 459 | MUSB_RXCSR_H_AUTOREQ 460 | MUSB_RXCSR_AUTOCLEAR); 461 462 /* write 2x to allow double buffering */ 463 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 464 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 465 466 /* flush writebuffer */ 467 return musb_readw(hw_ep->regs, MUSB_RXCSR); 468 } 469 470 /* 471 * PIO RX for a packet (or part of it). 472 */ 473 static bool 474 musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) 475 { 476 u16 rx_count; 477 u8 *buf; 478 u16 csr; 479 bool done = false; 480 u32 length; 481 int do_flush = 0; 482 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 483 void __iomem *epio = hw_ep->regs; 484 struct musb_qh *qh = hw_ep->in_qh; 485 int pipe = urb->pipe; 486 void *buffer = urb->transfer_buffer; 487 488 /* musb_ep_select(mbase, epnum); */ 489 rx_count = musb_readw(epio, MUSB_RXCOUNT); 490 dev_dbg(musb->controller, "RX%d count %d, buffer %p len %d/%d\n", epnum, rx_count, 491 urb->transfer_buffer, qh->offset, 492 urb->transfer_buffer_length); 493 494 /* unload FIFO */ 495 #ifndef __UBOOT__ 496 if (usb_pipeisoc(pipe)) { 497 int status = 0; 498 struct usb_iso_packet_descriptor *d; 499 500 if (iso_err) { 501 status = -EILSEQ; 502 urb->error_count++; 503 } 504 505 d = urb->iso_frame_desc + qh->iso_idx; 506 buf = buffer + d->offset; 507 length = d->length; 508 if (rx_count > length) { 509 if (status == 0) { 510 status = -EOVERFLOW; 511 urb->error_count++; 512 } 513 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); 514 do_flush = 1; 515 } else 516 length = rx_count; 517 urb->actual_length += length; 518 d->actual_length = length; 519 520 d->status = status; 521 522 /* see if we are done */ 523 done = (++qh->iso_idx >= urb->number_of_packets); 524 } else { 525 #endif 526 /* non-isoch */ 527 buf = buffer + qh->offset; 528 length = urb->transfer_buffer_length - qh->offset; 529 if (rx_count > length) { 530 if (urb->status == -EINPROGRESS) 531 urb->status = -EOVERFLOW; 532 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n", rx_count, length); 533 do_flush = 1; 534 } else 535 length = rx_count; 536 urb->actual_length += length; 537 qh->offset += length; 538 539 /* see if we are done */ 540 done = (urb->actual_length == urb->transfer_buffer_length) 541 || (rx_count < qh->maxpacket) 542 || (urb->status != -EINPROGRESS); 543 if (done 544 && (urb->status == -EINPROGRESS) 545 && (urb->transfer_flags & URB_SHORT_NOT_OK) 546 && (urb->actual_length 547 < urb->transfer_buffer_length)) 548 urb->status = -EREMOTEIO; 549 #ifndef __UBOOT__ 550 } 551 #endif 552 553 musb_read_fifo(hw_ep, length, buf); 554 555 csr = musb_readw(epio, MUSB_RXCSR); 556 csr |= MUSB_RXCSR_H_WZC_BITS; 557 if (unlikely(do_flush)) 558 musb_h_flush_rxfifo(hw_ep, csr); 559 else { 560 /* REVISIT this assumes AUTOCLEAR is never set */ 561 csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); 562 if (!done) 563 csr |= MUSB_RXCSR_H_REQPKT; 564 musb_writew(epio, MUSB_RXCSR, csr); 565 } 566 567 return done; 568 } 569 570 /* we don't always need to reinit a given side of an endpoint... 571 * when we do, use tx/rx reinit routine and then construct a new CSR 572 * to address data toggle, NYET, and DMA or PIO. 573 * 574 * it's possible that driver bugs (especially for DMA) or aborting a 575 * transfer might have left the endpoint busier than it should be. 576 * the busy/not-empty tests are basically paranoia. 577 */ 578 static void 579 musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep) 580 { 581 u16 csr; 582 583 /* NOTE: we know the "rx" fifo reinit never triggers for ep0. 584 * That always uses tx_reinit since ep0 repurposes TX register 585 * offsets; the initial SETUP packet is also a kind of OUT. 586 */ 587 588 /* if programmed for Tx, put it in RX mode */ 589 if (ep->is_shared_fifo) { 590 csr = musb_readw(ep->regs, MUSB_TXCSR); 591 if (csr & MUSB_TXCSR_MODE) { 592 musb_h_tx_flush_fifo(ep); 593 csr = musb_readw(ep->regs, MUSB_TXCSR); 594 musb_writew(ep->regs, MUSB_TXCSR, 595 csr | MUSB_TXCSR_FRCDATATOG); 596 } 597 598 /* 599 * Clear the MODE bit (and everything else) to enable Rx. 600 * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. 601 */ 602 if (csr & MUSB_TXCSR_DMAMODE) 603 musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); 604 musb_writew(ep->regs, MUSB_TXCSR, 0); 605 606 /* scrub all previous state, clearing toggle */ 607 } else { 608 csr = musb_readw(ep->regs, MUSB_RXCSR); 609 if (csr & MUSB_RXCSR_RXPKTRDY) 610 WARNING("rx%d, packet/%d ready?\n", ep->epnum, 611 musb_readw(ep->regs, MUSB_RXCOUNT)); 612 613 musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); 614 } 615 616 /* target addr and (for multipoint) hub addr/port */ 617 if (musb->is_multipoint) { 618 musb_write_rxfunaddr(ep->target_regs, qh->addr_reg); 619 musb_write_rxhubaddr(ep->target_regs, qh->h_addr_reg); 620 musb_write_rxhubport(ep->target_regs, qh->h_port_reg); 621 622 } else 623 musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); 624 625 /* protocol/endpoint, interval/NAKlimit, i/o size */ 626 musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); 627 musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); 628 /* NOTE: bulk combining rewrites high bits of maxpacket */ 629 /* Set RXMAXP with the FIFO size of the endpoint 630 * to disable double buffer mode. 631 */ 632 if (musb->double_buffer_not_ok) 633 musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx); 634 else 635 musb_writew(ep->regs, MUSB_RXMAXP, 636 qh->maxpacket | ((qh->hb_mult - 1) << 11)); 637 638 ep->rx_reinit = 0; 639 } 640 641 static bool musb_tx_dma_program(struct dma_controller *dma, 642 struct musb_hw_ep *hw_ep, struct musb_qh *qh, 643 struct urb *urb, u32 offset, u32 length) 644 { 645 struct dma_channel *channel = hw_ep->tx_channel; 646 void __iomem *epio = hw_ep->regs; 647 u16 pkt_size = qh->maxpacket; 648 u16 csr; 649 u8 mode; 650 651 #ifdef CONFIG_USB_INVENTRA_DMA 652 if (length > channel->max_len) 653 length = channel->max_len; 654 655 csr = musb_readw(epio, MUSB_TXCSR); 656 if (length > pkt_size) { 657 mode = 1; 658 csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; 659 /* autoset shouldn't be set in high bandwidth */ 660 if (qh->hb_mult == 1) 661 csr |= MUSB_TXCSR_AUTOSET; 662 } else { 663 mode = 0; 664 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); 665 csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ 666 } 667 channel->desired_mode = mode; 668 musb_writew(epio, MUSB_TXCSR, csr); 669 #else 670 if (!is_cppi_enabled() && !tusb_dma_omap()) 671 return false; 672 673 channel->actual_len = 0; 674 675 /* 676 * TX uses "RNDIS" mode automatically but needs help 677 * to identify the zero-length-final-packet case. 678 */ 679 mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; 680 #endif 681 682 qh->segsize = length; 683 684 /* 685 * Ensure the data reaches to main memory before starting 686 * DMA transfer 687 */ 688 wmb(); 689 690 if (!dma->channel_program(channel, pkt_size, mode, 691 urb->transfer_dma + offset, length)) { 692 dma->channel_release(channel); 693 hw_ep->tx_channel = NULL; 694 695 csr = musb_readw(epio, MUSB_TXCSR); 696 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); 697 musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); 698 return false; 699 } 700 return true; 701 } 702 703 /* 704 * Program an HDRC endpoint as per the given URB 705 * Context: irqs blocked, controller lock held 706 */ 707 static void musb_ep_program(struct musb *musb, u8 epnum, 708 struct urb *urb, int is_out, 709 u8 *buf, u32 offset, u32 len) 710 { 711 struct dma_controller *dma_controller; 712 struct dma_channel *dma_channel; 713 u8 dma_ok; 714 void __iomem *mbase = musb->mregs; 715 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 716 void __iomem *epio = hw_ep->regs; 717 struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); 718 u16 packet_sz = qh->maxpacket; 719 720 dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s " 721 "h_addr%02x h_port%02x bytes %d\n", 722 is_out ? "-->" : "<--", 723 epnum, urb, urb->dev->speed, 724 qh->addr_reg, qh->epnum, is_out ? "out" : "in", 725 qh->h_addr_reg, qh->h_port_reg, 726 len); 727 728 musb_ep_select(mbase, epnum); 729 730 /* candidate for DMA? */ 731 dma_controller = musb->dma_controller; 732 if (is_dma_capable() && epnum && dma_controller) { 733 dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; 734 if (!dma_channel) { 735 dma_channel = dma_controller->channel_alloc( 736 dma_controller, hw_ep, is_out); 737 if (is_out) 738 hw_ep->tx_channel = dma_channel; 739 else 740 hw_ep->rx_channel = dma_channel; 741 } 742 } else 743 dma_channel = NULL; 744 745 /* make sure we clear DMAEnab, autoSet bits from previous run */ 746 747 /* OUT/transmit/EP0 or IN/receive? */ 748 if (is_out) { 749 u16 csr; 750 u16 int_txe; 751 u16 load_count; 752 753 csr = musb_readw(epio, MUSB_TXCSR); 754 755 /* disable interrupt in case we flush */ 756 int_txe = musb_readw(mbase, MUSB_INTRTXE); 757 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); 758 759 /* general endpoint setup */ 760 if (epnum) { 761 /* flush all old state, set default */ 762 musb_h_tx_flush_fifo(hw_ep); 763 764 /* 765 * We must not clear the DMAMODE bit before or in 766 * the same cycle with the DMAENAB bit, so we clear 767 * the latter first... 768 */ 769 csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT 770 | MUSB_TXCSR_AUTOSET 771 | MUSB_TXCSR_DMAENAB 772 | MUSB_TXCSR_FRCDATATOG 773 | MUSB_TXCSR_H_RXSTALL 774 | MUSB_TXCSR_H_ERROR 775 | MUSB_TXCSR_TXPKTRDY 776 ); 777 csr |= MUSB_TXCSR_MODE; 778 779 if (usb_gettoggle(urb->dev, qh->epnum, 1)) 780 csr |= MUSB_TXCSR_H_WR_DATATOGGLE 781 | MUSB_TXCSR_H_DATATOGGLE; 782 else 783 csr |= MUSB_TXCSR_CLRDATATOG; 784 785 musb_writew(epio, MUSB_TXCSR, csr); 786 /* REVISIT may need to clear FLUSHFIFO ... */ 787 csr &= ~MUSB_TXCSR_DMAMODE; 788 musb_writew(epio, MUSB_TXCSR, csr); 789 csr = musb_readw(epio, MUSB_TXCSR); 790 } else { 791 /* endpoint 0: just flush */ 792 musb_h_ep0_flush_fifo(hw_ep); 793 } 794 795 /* target addr and (for multipoint) hub addr/port */ 796 if (musb->is_multipoint) { 797 musb_write_txfunaddr(mbase, epnum, qh->addr_reg); 798 musb_write_txhubaddr(mbase, epnum, qh->h_addr_reg); 799 musb_write_txhubport(mbase, epnum, qh->h_port_reg); 800 /* FIXME if !epnum, do the same for RX ... */ 801 } else 802 musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); 803 804 /* protocol/endpoint/interval/NAKlimit */ 805 if (epnum) { 806 musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); 807 if (musb->double_buffer_not_ok) 808 musb_writew(epio, MUSB_TXMAXP, 809 hw_ep->max_packet_sz_tx); 810 else if (can_bulk_split(musb, qh->type)) 811 musb_writew(epio, MUSB_TXMAXP, packet_sz 812 | ((hw_ep->max_packet_sz_tx / 813 packet_sz) - 1) << 11); 814 else 815 musb_writew(epio, MUSB_TXMAXP, 816 qh->maxpacket | 817 ((qh->hb_mult - 1) << 11)); 818 musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); 819 } else { 820 musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); 821 if (musb->is_multipoint) 822 musb_writeb(epio, MUSB_TYPE0, 823 qh->type_reg); 824 } 825 826 if (can_bulk_split(musb, qh->type)) 827 load_count = min((u32) hw_ep->max_packet_sz_tx, 828 len); 829 else 830 load_count = min((u32) packet_sz, len); 831 832 if (dma_channel && musb_tx_dma_program(dma_controller, 833 hw_ep, qh, urb, offset, len)) 834 load_count = 0; 835 836 if (load_count) { 837 /* PIO to load FIFO */ 838 qh->segsize = load_count; 839 musb_write_fifo(hw_ep, load_count, buf); 840 } 841 842 /* re-enable interrupt */ 843 musb_writew(mbase, MUSB_INTRTXE, int_txe); 844 845 /* IN/receive */ 846 } else { 847 u16 csr; 848 849 if (hw_ep->rx_reinit) { 850 musb_rx_reinit(musb, qh, hw_ep); 851 852 /* init new state: toggle and NYET, maybe DMA later */ 853 if (usb_gettoggle(urb->dev, qh->epnum, 0)) 854 csr = MUSB_RXCSR_H_WR_DATATOGGLE 855 | MUSB_RXCSR_H_DATATOGGLE; 856 else 857 csr = 0; 858 if (qh->type == USB_ENDPOINT_XFER_INT) 859 csr |= MUSB_RXCSR_DISNYET; 860 861 } else { 862 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 863 864 if (csr & (MUSB_RXCSR_RXPKTRDY 865 | MUSB_RXCSR_DMAENAB 866 | MUSB_RXCSR_H_REQPKT)) 867 ERR("broken !rx_reinit, ep%d csr %04x\n", 868 hw_ep->epnum, csr); 869 870 /* scrub any stale state, leaving toggle alone */ 871 csr &= MUSB_RXCSR_DISNYET; 872 } 873 874 /* kick things off */ 875 876 if ((is_cppi_enabled() || tusb_dma_omap()) && dma_channel) { 877 /* Candidate for DMA */ 878 dma_channel->actual_len = 0L; 879 qh->segsize = len; 880 881 /* AUTOREQ is in a DMA register */ 882 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 883 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 884 885 /* 886 * Unless caller treats short RX transfers as 887 * errors, we dare not queue multiple transfers. 888 */ 889 dma_ok = dma_controller->channel_program(dma_channel, 890 packet_sz, !(urb->transfer_flags & 891 URB_SHORT_NOT_OK), 892 urb->transfer_dma + offset, 893 qh->segsize); 894 if (!dma_ok) { 895 dma_controller->channel_release(dma_channel); 896 hw_ep->rx_channel = dma_channel = NULL; 897 } else 898 csr |= MUSB_RXCSR_DMAENAB; 899 } 900 901 csr |= MUSB_RXCSR_H_REQPKT; 902 dev_dbg(musb->controller, "RXCSR%d := %04x\n", epnum, csr); 903 musb_writew(hw_ep->regs, MUSB_RXCSR, csr); 904 csr = musb_readw(hw_ep->regs, MUSB_RXCSR); 905 } 906 } 907 908 909 /* 910 * Service the default endpoint (ep0) as host. 911 * Return true until it's time to start the status stage. 912 */ 913 static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) 914 { 915 bool more = false; 916 u8 *fifo_dest = NULL; 917 u16 fifo_count = 0; 918 struct musb_hw_ep *hw_ep = musb->control_ep; 919 struct musb_qh *qh = hw_ep->in_qh; 920 struct usb_ctrlrequest *request; 921 922 switch (musb->ep0_stage) { 923 case MUSB_EP0_IN: 924 fifo_dest = urb->transfer_buffer + urb->actual_length; 925 fifo_count = min_t(size_t, len, urb->transfer_buffer_length - 926 urb->actual_length); 927 if (fifo_count < len) 928 urb->status = -EOVERFLOW; 929 930 musb_read_fifo(hw_ep, fifo_count, fifo_dest); 931 932 urb->actual_length += fifo_count; 933 if (len < qh->maxpacket) { 934 /* always terminate on short read; it's 935 * rarely reported as an error. 936 */ 937 } else if (urb->actual_length < 938 urb->transfer_buffer_length) 939 more = true; 940 break; 941 case MUSB_EP0_START: 942 request = (struct usb_ctrlrequest *) urb->setup_packet; 943 944 if (!request->wLength) { 945 dev_dbg(musb->controller, "start no-DATA\n"); 946 break; 947 } else if (request->bRequestType & USB_DIR_IN) { 948 dev_dbg(musb->controller, "start IN-DATA\n"); 949 musb->ep0_stage = MUSB_EP0_IN; 950 more = true; 951 break; 952 } else { 953 dev_dbg(musb->controller, "start OUT-DATA\n"); 954 musb->ep0_stage = MUSB_EP0_OUT; 955 more = true; 956 } 957 /* FALLTHROUGH */ 958 case MUSB_EP0_OUT: 959 fifo_count = min_t(size_t, qh->maxpacket, 960 urb->transfer_buffer_length - 961 urb->actual_length); 962 if (fifo_count) { 963 fifo_dest = (u8 *) (urb->transfer_buffer 964 + urb->actual_length); 965 dev_dbg(musb->controller, "Sending %d byte%s to ep0 fifo %p\n", 966 fifo_count, 967 (fifo_count == 1) ? "" : "s", 968 fifo_dest); 969 musb_write_fifo(hw_ep, fifo_count, fifo_dest); 970 971 urb->actual_length += fifo_count; 972 more = true; 973 } 974 break; 975 default: 976 ERR("bogus ep0 stage %d\n", musb->ep0_stage); 977 break; 978 } 979 980 return more; 981 } 982 983 /* 984 * Handle default endpoint interrupt as host. Only called in IRQ time 985 * from musb_interrupt(). 986 * 987 * called with controller irqlocked 988 */ 989 irqreturn_t musb_h_ep0_irq(struct musb *musb) 990 { 991 struct urb *urb; 992 u16 csr, len; 993 int status = 0; 994 void __iomem *mbase = musb->mregs; 995 struct musb_hw_ep *hw_ep = musb->control_ep; 996 void __iomem *epio = hw_ep->regs; 997 struct musb_qh *qh = hw_ep->in_qh; 998 bool complete = false; 999 irqreturn_t retval = IRQ_NONE; 1000 1001 /* ep0 only has one queue, "in" */ 1002 urb = next_urb(qh); 1003 1004 musb_ep_select(mbase, 0); 1005 csr = musb_readw(epio, MUSB_CSR0); 1006 len = (csr & MUSB_CSR0_RXPKTRDY) 1007 ? musb_readb(epio, MUSB_COUNT0) 1008 : 0; 1009 1010 dev_dbg(musb->controller, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d\n", 1011 csr, qh, len, urb, musb->ep0_stage); 1012 1013 /* if we just did status stage, we are done */ 1014 if (MUSB_EP0_STATUS == musb->ep0_stage) { 1015 retval = IRQ_HANDLED; 1016 complete = true; 1017 } 1018 1019 /* prepare status */ 1020 if (csr & MUSB_CSR0_H_RXSTALL) { 1021 dev_dbg(musb->controller, "STALLING ENDPOINT\n"); 1022 status = -EPIPE; 1023 1024 } else if (csr & MUSB_CSR0_H_ERROR) { 1025 dev_dbg(musb->controller, "no response, csr0 %04x\n", csr); 1026 status = -EPROTO; 1027 1028 } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { 1029 dev_dbg(musb->controller, "control NAK timeout\n"); 1030 1031 /* NOTE: this code path would be a good place to PAUSE a 1032 * control transfer, if another one is queued, so that 1033 * ep0 is more likely to stay busy. That's already done 1034 * for bulk RX transfers. 1035 * 1036 * if (qh->ring.next != &musb->control), then 1037 * we have a candidate... NAKing is *NOT* an error 1038 */ 1039 musb_writew(epio, MUSB_CSR0, 0); 1040 retval = IRQ_HANDLED; 1041 } 1042 1043 if (status) { 1044 dev_dbg(musb->controller, "aborting\n"); 1045 retval = IRQ_HANDLED; 1046 if (urb) 1047 urb->status = status; 1048 complete = true; 1049 1050 /* use the proper sequence to abort the transfer */ 1051 if (csr & MUSB_CSR0_H_REQPKT) { 1052 csr &= ~MUSB_CSR0_H_REQPKT; 1053 musb_writew(epio, MUSB_CSR0, csr); 1054 csr &= ~MUSB_CSR0_H_NAKTIMEOUT; 1055 musb_writew(epio, MUSB_CSR0, csr); 1056 } else { 1057 musb_h_ep0_flush_fifo(hw_ep); 1058 } 1059 1060 musb_writeb(epio, MUSB_NAKLIMIT0, 0); 1061 1062 /* clear it */ 1063 musb_writew(epio, MUSB_CSR0, 0); 1064 } 1065 1066 if (unlikely(!urb)) { 1067 /* stop endpoint since we have no place for its data, this 1068 * SHOULD NEVER HAPPEN! */ 1069 ERR("no URB for end 0\n"); 1070 1071 musb_h_ep0_flush_fifo(hw_ep); 1072 goto done; 1073 } 1074 1075 if (!complete) { 1076 /* call common logic and prepare response */ 1077 if (musb_h_ep0_continue(musb, len, urb)) { 1078 /* more packets required */ 1079 csr = (MUSB_EP0_IN == musb->ep0_stage) 1080 ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; 1081 } else { 1082 /* data transfer complete; perform status phase */ 1083 if (usb_pipeout(urb->pipe) 1084 || !urb->transfer_buffer_length) 1085 csr = MUSB_CSR0_H_STATUSPKT 1086 | MUSB_CSR0_H_REQPKT; 1087 else 1088 csr = MUSB_CSR0_H_STATUSPKT 1089 | MUSB_CSR0_TXPKTRDY; 1090 1091 /* flag status stage */ 1092 musb->ep0_stage = MUSB_EP0_STATUS; 1093 1094 dev_dbg(musb->controller, "ep0 STATUS, csr %04x\n", csr); 1095 1096 } 1097 musb_writew(epio, MUSB_CSR0, csr); 1098 retval = IRQ_HANDLED; 1099 } else 1100 musb->ep0_stage = MUSB_EP0_IDLE; 1101 1102 /* call completion handler if done */ 1103 if (complete) 1104 musb_advance_schedule(musb, urb, hw_ep, 1); 1105 done: 1106 return retval; 1107 } 1108 1109 1110 #ifdef CONFIG_USB_INVENTRA_DMA 1111 1112 /* Host side TX (OUT) using Mentor DMA works as follows: 1113 submit_urb -> 1114 - if queue was empty, Program Endpoint 1115 - ... which starts DMA to fifo in mode 1 or 0 1116 1117 DMA Isr (transfer complete) -> TxAvail() 1118 - Stop DMA (~DmaEnab) (<--- Alert ... currently happens 1119 only in musb_cleanup_urb) 1120 - TxPktRdy has to be set in mode 0 or for 1121 short packets in mode 1. 1122 */ 1123 1124 #endif 1125 1126 /* Service a Tx-Available or dma completion irq for the endpoint */ 1127 void musb_host_tx(struct musb *musb, u8 epnum) 1128 { 1129 int pipe; 1130 bool done = false; 1131 u16 tx_csr; 1132 size_t length = 0; 1133 size_t offset = 0; 1134 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 1135 void __iomem *epio = hw_ep->regs; 1136 struct musb_qh *qh = hw_ep->out_qh; 1137 struct urb *urb = next_urb(qh); 1138 u32 status = 0; 1139 void __iomem *mbase = musb->mregs; 1140 struct dma_channel *dma; 1141 bool transfer_pending = false; 1142 1143 musb_ep_select(mbase, epnum); 1144 tx_csr = musb_readw(epio, MUSB_TXCSR); 1145 1146 /* with CPPI, DMA sometimes triggers "extra" irqs */ 1147 if (!urb) { 1148 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); 1149 return; 1150 } 1151 1152 pipe = urb->pipe; 1153 dma = is_dma_capable() ? hw_ep->tx_channel : NULL; 1154 dev_dbg(musb->controller, "OUT/TX%d end, csr %04x%s\n", epnum, tx_csr, 1155 dma ? ", dma" : ""); 1156 1157 /* check for errors */ 1158 if (tx_csr & MUSB_TXCSR_H_RXSTALL) { 1159 /* dma was disabled, fifo flushed */ 1160 dev_dbg(musb->controller, "TX end %d stall\n", epnum); 1161 1162 /* stall; record URB status */ 1163 status = -EPIPE; 1164 1165 } else if (tx_csr & MUSB_TXCSR_H_ERROR) { 1166 /* (NON-ISO) dma was disabled, fifo flushed */ 1167 dev_dbg(musb->controller, "TX 3strikes on ep=%d\n", epnum); 1168 1169 status = -ETIMEDOUT; 1170 1171 } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { 1172 dev_dbg(musb->controller, "TX end=%d device not responding\n", epnum); 1173 1174 /* NOTE: this code path would be a good place to PAUSE a 1175 * transfer, if there's some other (nonperiodic) tx urb 1176 * that could use this fifo. (dma complicates it...) 1177 * That's already done for bulk RX transfers. 1178 * 1179 * if (bulk && qh->ring.next != &musb->out_bulk), then 1180 * we have a candidate... NAKing is *NOT* an error 1181 */ 1182 musb_ep_select(mbase, epnum); 1183 musb_writew(epio, MUSB_TXCSR, 1184 MUSB_TXCSR_H_WZC_BITS 1185 | MUSB_TXCSR_TXPKTRDY); 1186 return; 1187 } 1188 1189 if (status) { 1190 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1191 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1192 (void) musb->dma_controller->channel_abort(dma); 1193 } 1194 1195 /* do the proper sequence to abort the transfer in the 1196 * usb core; the dma engine should already be stopped. 1197 */ 1198 musb_h_tx_flush_fifo(hw_ep); 1199 tx_csr &= ~(MUSB_TXCSR_AUTOSET 1200 | MUSB_TXCSR_DMAENAB 1201 | MUSB_TXCSR_H_ERROR 1202 | MUSB_TXCSR_H_RXSTALL 1203 | MUSB_TXCSR_H_NAKTIMEOUT 1204 ); 1205 1206 musb_ep_select(mbase, epnum); 1207 musb_writew(epio, MUSB_TXCSR, tx_csr); 1208 /* REVISIT may need to clear FLUSHFIFO ... */ 1209 musb_writew(epio, MUSB_TXCSR, tx_csr); 1210 musb_writeb(epio, MUSB_TXINTERVAL, 0); 1211 1212 done = true; 1213 } 1214 1215 /* second cppi case */ 1216 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1217 dev_dbg(musb->controller, "extra TX%d ready, csr %04x\n", epnum, tx_csr); 1218 return; 1219 } 1220 1221 if (is_dma_capable() && dma && !status) { 1222 /* 1223 * DMA has completed. But if we're using DMA mode 1 (multi 1224 * packet DMA), we need a terminal TXPKTRDY interrupt before 1225 * we can consider this transfer completed, lest we trash 1226 * its last packet when writing the next URB's data. So we 1227 * switch back to mode 0 to get that interrupt; we'll come 1228 * back here once it happens. 1229 */ 1230 if (tx_csr & MUSB_TXCSR_DMAMODE) { 1231 /* 1232 * We shouldn't clear DMAMODE with DMAENAB set; so 1233 * clear them in a safe order. That should be OK 1234 * once TXPKTRDY has been set (and I've never seen 1235 * it being 0 at this moment -- DMA interrupt latency 1236 * is significant) but if it hasn't been then we have 1237 * no choice but to stop being polite and ignore the 1238 * programmer's guide... :-) 1239 * 1240 * Note that we must write TXCSR with TXPKTRDY cleared 1241 * in order not to re-trigger the packet send (this bit 1242 * can't be cleared by CPU), and there's another caveat: 1243 * TXPKTRDY may be set shortly and then cleared in the 1244 * double-buffered FIFO mode, so we do an extra TXCSR 1245 * read for debouncing... 1246 */ 1247 tx_csr &= musb_readw(epio, MUSB_TXCSR); 1248 if (tx_csr & MUSB_TXCSR_TXPKTRDY) { 1249 tx_csr &= ~(MUSB_TXCSR_DMAENAB | 1250 MUSB_TXCSR_TXPKTRDY); 1251 musb_writew(epio, MUSB_TXCSR, 1252 tx_csr | MUSB_TXCSR_H_WZC_BITS); 1253 } 1254 tx_csr &= ~(MUSB_TXCSR_DMAMODE | 1255 MUSB_TXCSR_TXPKTRDY); 1256 musb_writew(epio, MUSB_TXCSR, 1257 tx_csr | MUSB_TXCSR_H_WZC_BITS); 1258 1259 /* 1260 * There is no guarantee that we'll get an interrupt 1261 * after clearing DMAMODE as we might have done this 1262 * too late (after TXPKTRDY was cleared by controller). 1263 * Re-read TXCSR as we have spoiled its previous value. 1264 */ 1265 tx_csr = musb_readw(epio, MUSB_TXCSR); 1266 } 1267 1268 /* 1269 * We may get here from a DMA completion or TXPKTRDY interrupt. 1270 * In any case, we must check the FIFO status here and bail out 1271 * only if the FIFO still has data -- that should prevent the 1272 * "missed" TXPKTRDY interrupts and deal with double-buffered 1273 * FIFO mode too... 1274 */ 1275 if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { 1276 dev_dbg(musb->controller, "DMA complete but packet still in FIFO, " 1277 "CSR %04x\n", tx_csr); 1278 return; 1279 } 1280 } 1281 1282 if (!status || dma || usb_pipeisoc(pipe)) { 1283 if (dma) 1284 length = dma->actual_len; 1285 else 1286 length = qh->segsize; 1287 qh->offset += length; 1288 1289 if (usb_pipeisoc(pipe)) { 1290 #ifndef __UBOOT__ 1291 struct usb_iso_packet_descriptor *d; 1292 1293 d = urb->iso_frame_desc + qh->iso_idx; 1294 d->actual_length = length; 1295 d->status = status; 1296 if (++qh->iso_idx >= urb->number_of_packets) { 1297 done = true; 1298 } else { 1299 d++; 1300 offset = d->offset; 1301 length = d->length; 1302 } 1303 #endif 1304 } else if (dma && urb->transfer_buffer_length == qh->offset) { 1305 done = true; 1306 } else { 1307 /* see if we need to send more data, or ZLP */ 1308 if (qh->segsize < qh->maxpacket) 1309 done = true; 1310 else if (qh->offset == urb->transfer_buffer_length 1311 && !(urb->transfer_flags 1312 & URB_ZERO_PACKET)) 1313 done = true; 1314 if (!done) { 1315 offset = qh->offset; 1316 length = urb->transfer_buffer_length - offset; 1317 transfer_pending = true; 1318 } 1319 } 1320 } 1321 1322 /* urb->status != -EINPROGRESS means request has been faulted, 1323 * so we must abort this transfer after cleanup 1324 */ 1325 if (urb->status != -EINPROGRESS) { 1326 done = true; 1327 if (status == 0) 1328 status = urb->status; 1329 } 1330 1331 if (done) { 1332 /* set status */ 1333 urb->status = status; 1334 urb->actual_length = qh->offset; 1335 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); 1336 return; 1337 } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { 1338 if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, 1339 offset, length)) { 1340 if (is_cppi_enabled() || tusb_dma_omap()) 1341 musb_h_tx_dma_start(hw_ep); 1342 return; 1343 } 1344 } else if (tx_csr & MUSB_TXCSR_DMAENAB) { 1345 dev_dbg(musb->controller, "not complete, but DMA enabled?\n"); 1346 return; 1347 } 1348 1349 /* 1350 * PIO: start next packet in this URB. 1351 * 1352 * REVISIT: some docs say that when hw_ep->tx_double_buffered, 1353 * (and presumably, FIFO is not half-full) we should write *two* 1354 * packets before updating TXCSR; other docs disagree... 1355 */ 1356 if (length > qh->maxpacket) 1357 length = qh->maxpacket; 1358 /* Unmap the buffer so that CPU can use it */ 1359 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); 1360 musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); 1361 qh->segsize = length; 1362 1363 musb_ep_select(mbase, epnum); 1364 musb_writew(epio, MUSB_TXCSR, 1365 MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); 1366 } 1367 1368 1369 #ifdef CONFIG_USB_INVENTRA_DMA 1370 1371 /* Host side RX (IN) using Mentor DMA works as follows: 1372 submit_urb -> 1373 - if queue was empty, ProgramEndpoint 1374 - first IN token is sent out (by setting ReqPkt) 1375 LinuxIsr -> RxReady() 1376 /\ => first packet is received 1377 | - Set in mode 0 (DmaEnab, ~ReqPkt) 1378 | -> DMA Isr (transfer complete) -> RxReady() 1379 | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) 1380 | - if urb not complete, send next IN token (ReqPkt) 1381 | | else complete urb. 1382 | | 1383 --------------------------- 1384 * 1385 * Nuances of mode 1: 1386 * For short packets, no ack (+RxPktRdy) is sent automatically 1387 * (even if AutoClear is ON) 1388 * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent 1389 * automatically => major problem, as collecting the next packet becomes 1390 * difficult. Hence mode 1 is not used. 1391 * 1392 * REVISIT 1393 * All we care about at this driver level is that 1394 * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; 1395 * (b) termination conditions are: short RX, or buffer full; 1396 * (c) fault modes include 1397 * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. 1398 * (and that endpoint's dma queue stops immediately) 1399 * - overflow (full, PLUS more bytes in the terminal packet) 1400 * 1401 * So for example, usb-storage sets URB_SHORT_NOT_OK, and would 1402 * thus be a great candidate for using mode 1 ... for all but the 1403 * last packet of one URB's transfer. 1404 */ 1405 1406 #endif 1407 1408 /* Schedule next QH from musb->in_bulk and move the current qh to 1409 * the end; avoids starvation for other endpoints. 1410 */ 1411 static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep) 1412 { 1413 struct dma_channel *dma; 1414 struct urb *urb; 1415 void __iomem *mbase = musb->mregs; 1416 void __iomem *epio = ep->regs; 1417 struct musb_qh *cur_qh, *next_qh; 1418 u16 rx_csr; 1419 1420 musb_ep_select(mbase, ep->epnum); 1421 dma = is_dma_capable() ? ep->rx_channel : NULL; 1422 1423 /* clear nak timeout bit */ 1424 rx_csr = musb_readw(epio, MUSB_RXCSR); 1425 rx_csr |= MUSB_RXCSR_H_WZC_BITS; 1426 rx_csr &= ~MUSB_RXCSR_DATAERROR; 1427 musb_writew(epio, MUSB_RXCSR, rx_csr); 1428 1429 cur_qh = first_qh(&musb->in_bulk); 1430 if (cur_qh) { 1431 urb = next_urb(cur_qh); 1432 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1433 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1434 musb->dma_controller->channel_abort(dma); 1435 urb->actual_length += dma->actual_len; 1436 dma->actual_len = 0L; 1437 } 1438 musb_save_toggle(cur_qh, 1, urb); 1439 1440 /* move cur_qh to end of queue */ 1441 list_move_tail(&cur_qh->ring, &musb->in_bulk); 1442 1443 /* get the next qh from musb->in_bulk */ 1444 next_qh = first_qh(&musb->in_bulk); 1445 1446 /* set rx_reinit and schedule the next qh */ 1447 ep->rx_reinit = 1; 1448 musb_start_urb(musb, 1, next_qh); 1449 } 1450 } 1451 1452 /* 1453 * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, 1454 * and high-bandwidth IN transfer cases. 1455 */ 1456 void musb_host_rx(struct musb *musb, u8 epnum) 1457 { 1458 struct urb *urb; 1459 struct musb_hw_ep *hw_ep = musb->endpoints + epnum; 1460 void __iomem *epio = hw_ep->regs; 1461 struct musb_qh *qh = hw_ep->in_qh; 1462 size_t xfer_len; 1463 void __iomem *mbase = musb->mregs; 1464 int pipe; 1465 u16 rx_csr, val; 1466 bool iso_err = false; 1467 bool done = false; 1468 u32 status; 1469 struct dma_channel *dma; 1470 1471 musb_ep_select(mbase, epnum); 1472 1473 urb = next_urb(qh); 1474 dma = is_dma_capable() ? hw_ep->rx_channel : NULL; 1475 status = 0; 1476 xfer_len = 0; 1477 1478 rx_csr = musb_readw(epio, MUSB_RXCSR); 1479 val = rx_csr; 1480 1481 if (unlikely(!urb)) { 1482 /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least 1483 * usbtest #11 (unlinks) triggers it regularly, sometimes 1484 * with fifo full. (Only with DMA??) 1485 */ 1486 dev_dbg(musb->controller, "BOGUS RX%d ready, csr %04x, count %d\n", epnum, val, 1487 musb_readw(epio, MUSB_RXCOUNT)); 1488 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); 1489 return; 1490 } 1491 1492 pipe = urb->pipe; 1493 1494 dev_dbg(musb->controller, "<== hw %d rxcsr %04x, urb actual %d (+dma %zu)\n", 1495 epnum, rx_csr, urb->actual_length, 1496 dma ? dma->actual_len : 0); 1497 1498 /* check for errors, concurrent stall & unlink is not really 1499 * handled yet! */ 1500 if (rx_csr & MUSB_RXCSR_H_RXSTALL) { 1501 dev_dbg(musb->controller, "RX end %d STALL\n", epnum); 1502 1503 /* stall; record URB status */ 1504 status = -EPIPE; 1505 1506 } else if (rx_csr & MUSB_RXCSR_H_ERROR) { 1507 dev_dbg(musb->controller, "end %d RX proto error\n", epnum); 1508 1509 status = -EPROTO; 1510 musb_writeb(epio, MUSB_RXINTERVAL, 0); 1511 1512 } else if (rx_csr & MUSB_RXCSR_DATAERROR) { 1513 1514 if (USB_ENDPOINT_XFER_ISOC != qh->type) { 1515 dev_dbg(musb->controller, "RX end %d NAK timeout\n", epnum); 1516 1517 /* NOTE: NAKing is *NOT* an error, so we want to 1518 * continue. Except ... if there's a request for 1519 * another QH, use that instead of starving it. 1520 * 1521 * Devices like Ethernet and serial adapters keep 1522 * reads posted at all times, which will starve 1523 * other devices without this logic. 1524 */ 1525 if (usb_pipebulk(urb->pipe) 1526 && qh->mux == 1 1527 && !list_is_singular(&musb->in_bulk)) { 1528 musb_bulk_rx_nak_timeout(musb, hw_ep); 1529 return; 1530 } 1531 musb_ep_select(mbase, epnum); 1532 rx_csr |= MUSB_RXCSR_H_WZC_BITS; 1533 rx_csr &= ~MUSB_RXCSR_DATAERROR; 1534 musb_writew(epio, MUSB_RXCSR, rx_csr); 1535 1536 goto finish; 1537 } else { 1538 dev_dbg(musb->controller, "RX end %d ISO data error\n", epnum); 1539 /* packet error reported later */ 1540 iso_err = true; 1541 } 1542 } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { 1543 dev_dbg(musb->controller, "end %d high bandwidth incomplete ISO packet RX\n", 1544 epnum); 1545 status = -EPROTO; 1546 } 1547 1548 /* faults abort the transfer */ 1549 if (status) { 1550 /* clean up dma and collect transfer count */ 1551 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1552 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1553 (void) musb->dma_controller->channel_abort(dma); 1554 xfer_len = dma->actual_len; 1555 } 1556 musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); 1557 musb_writeb(epio, MUSB_RXINTERVAL, 0); 1558 done = true; 1559 goto finish; 1560 } 1561 1562 if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { 1563 /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ 1564 ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); 1565 goto finish; 1566 } 1567 1568 /* thorough shutdown for now ... given more precise fault handling 1569 * and better queueing support, we might keep a DMA pipeline going 1570 * while processing this irq for earlier completions. 1571 */ 1572 1573 /* FIXME this is _way_ too much in-line logic for Mentor DMA */ 1574 1575 #ifndef CONFIG_USB_INVENTRA_DMA 1576 if (rx_csr & MUSB_RXCSR_H_REQPKT) { 1577 /* REVISIT this happened for a while on some short reads... 1578 * the cleanup still needs investigation... looks bad... 1579 * and also duplicates dma cleanup code above ... plus, 1580 * shouldn't this be the "half full" double buffer case? 1581 */ 1582 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { 1583 dma->status = MUSB_DMA_STATUS_CORE_ABORT; 1584 (void) musb->dma_controller->channel_abort(dma); 1585 xfer_len = dma->actual_len; 1586 done = true; 1587 } 1588 1589 dev_dbg(musb->controller, "RXCSR%d %04x, reqpkt, len %zu%s\n", epnum, rx_csr, 1590 xfer_len, dma ? ", dma" : ""); 1591 rx_csr &= ~MUSB_RXCSR_H_REQPKT; 1592 1593 musb_ep_select(mbase, epnum); 1594 musb_writew(epio, MUSB_RXCSR, 1595 MUSB_RXCSR_H_WZC_BITS | rx_csr); 1596 } 1597 #endif 1598 if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { 1599 xfer_len = dma->actual_len; 1600 1601 val &= ~(MUSB_RXCSR_DMAENAB 1602 | MUSB_RXCSR_H_AUTOREQ 1603 | MUSB_RXCSR_AUTOCLEAR 1604 | MUSB_RXCSR_RXPKTRDY); 1605 musb_writew(hw_ep->regs, MUSB_RXCSR, val); 1606 1607 #ifdef CONFIG_USB_INVENTRA_DMA 1608 if (usb_pipeisoc(pipe)) { 1609 struct usb_iso_packet_descriptor *d; 1610 1611 d = urb->iso_frame_desc + qh->iso_idx; 1612 d->actual_length = xfer_len; 1613 1614 /* even if there was an error, we did the dma 1615 * for iso_frame_desc->length 1616 */ 1617 if (d->status != -EILSEQ && d->status != -EOVERFLOW) 1618 d->status = 0; 1619 1620 if (++qh->iso_idx >= urb->number_of_packets) 1621 done = true; 1622 else 1623 done = false; 1624 1625 } else { 1626 /* done if urb buffer is full or short packet is recd */ 1627 done = (urb->actual_length + xfer_len >= 1628 urb->transfer_buffer_length 1629 || dma->actual_len < qh->maxpacket); 1630 } 1631 1632 /* send IN token for next packet, without AUTOREQ */ 1633 if (!done) { 1634 val |= MUSB_RXCSR_H_REQPKT; 1635 musb_writew(epio, MUSB_RXCSR, 1636 MUSB_RXCSR_H_WZC_BITS | val); 1637 } 1638 1639 dev_dbg(musb->controller, "ep %d dma %s, rxcsr %04x, rxcount %d\n", epnum, 1640 done ? "off" : "reset", 1641 musb_readw(epio, MUSB_RXCSR), 1642 musb_readw(epio, MUSB_RXCOUNT)); 1643 #else 1644 done = true; 1645 #endif 1646 } else if (urb->status == -EINPROGRESS) { 1647 /* if no errors, be sure a packet is ready for unloading */ 1648 if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { 1649 status = -EPROTO; 1650 ERR("Rx interrupt with no errors or packet!\n"); 1651 1652 /* FIXME this is another "SHOULD NEVER HAPPEN" */ 1653 1654 /* SCRUB (RX) */ 1655 /* do the proper sequence to abort the transfer */ 1656 musb_ep_select(mbase, epnum); 1657 val &= ~MUSB_RXCSR_H_REQPKT; 1658 musb_writew(epio, MUSB_RXCSR, val); 1659 goto finish; 1660 } 1661 1662 /* we are expecting IN packets */ 1663 #ifdef CONFIG_USB_INVENTRA_DMA 1664 if (dma) { 1665 struct dma_controller *c; 1666 u16 rx_count; 1667 int ret, length; 1668 dma_addr_t buf; 1669 1670 rx_count = musb_readw(epio, MUSB_RXCOUNT); 1671 1672 dev_dbg(musb->controller, "RX%d count %d, buffer 0x%x len %d/%d\n", 1673 epnum, rx_count, 1674 urb->transfer_dma 1675 + urb->actual_length, 1676 qh->offset, 1677 urb->transfer_buffer_length); 1678 1679 c = musb->dma_controller; 1680 1681 if (usb_pipeisoc(pipe)) { 1682 int d_status = 0; 1683 struct usb_iso_packet_descriptor *d; 1684 1685 d = urb->iso_frame_desc + qh->iso_idx; 1686 1687 if (iso_err) { 1688 d_status = -EILSEQ; 1689 urb->error_count++; 1690 } 1691 if (rx_count > d->length) { 1692 if (d_status == 0) { 1693 d_status = -EOVERFLOW; 1694 urb->error_count++; 1695 } 1696 dev_dbg(musb->controller, "** OVERFLOW %d into %d\n",\ 1697 rx_count, d->length); 1698 1699 length = d->length; 1700 } else 1701 length = rx_count; 1702 d->status = d_status; 1703 buf = urb->transfer_dma + d->offset; 1704 } else { 1705 length = rx_count; 1706 buf = urb->transfer_dma + 1707 urb->actual_length; 1708 } 1709 1710 dma->desired_mode = 0; 1711 #ifdef USE_MODE1 1712 /* because of the issue below, mode 1 will 1713 * only rarely behave with correct semantics. 1714 */ 1715 if ((urb->transfer_flags & 1716 URB_SHORT_NOT_OK) 1717 && (urb->transfer_buffer_length - 1718 urb->actual_length) 1719 > qh->maxpacket) 1720 dma->desired_mode = 1; 1721 if (rx_count < hw_ep->max_packet_sz_rx) { 1722 length = rx_count; 1723 dma->desired_mode = 0; 1724 } else { 1725 length = urb->transfer_buffer_length; 1726 } 1727 #endif 1728 1729 /* Disadvantage of using mode 1: 1730 * It's basically usable only for mass storage class; essentially all 1731 * other protocols also terminate transfers on short packets. 1732 * 1733 * Details: 1734 * An extra IN token is sent at the end of the transfer (due to AUTOREQ) 1735 * If you try to use mode 1 for (transfer_buffer_length - 512), and try 1736 * to use the extra IN token to grab the last packet using mode 0, then 1737 * the problem is that you cannot be sure when the device will send the 1738 * last packet and RxPktRdy set. Sometimes the packet is recd too soon 1739 * such that it gets lost when RxCSR is re-set at the end of the mode 1 1740 * transfer, while sometimes it is recd just a little late so that if you 1741 * try to configure for mode 0 soon after the mode 1 transfer is 1742 * completed, you will find rxcount 0. Okay, so you might think why not 1743 * wait for an interrupt when the pkt is recd. Well, you won't get any! 1744 */ 1745 1746 val = musb_readw(epio, MUSB_RXCSR); 1747 val &= ~MUSB_RXCSR_H_REQPKT; 1748 1749 if (dma->desired_mode == 0) 1750 val &= ~MUSB_RXCSR_H_AUTOREQ; 1751 else 1752 val |= MUSB_RXCSR_H_AUTOREQ; 1753 val |= MUSB_RXCSR_DMAENAB; 1754 1755 /* autoclear shouldn't be set in high bandwidth */ 1756 if (qh->hb_mult == 1) 1757 val |= MUSB_RXCSR_AUTOCLEAR; 1758 1759 musb_writew(epio, MUSB_RXCSR, 1760 MUSB_RXCSR_H_WZC_BITS | val); 1761 1762 /* REVISIT if when actual_length != 0, 1763 * transfer_buffer_length needs to be 1764 * adjusted first... 1765 */ 1766 ret = c->channel_program( 1767 dma, qh->maxpacket, 1768 dma->desired_mode, buf, length); 1769 1770 if (!ret) { 1771 c->channel_release(dma); 1772 hw_ep->rx_channel = NULL; 1773 dma = NULL; 1774 val = musb_readw(epio, MUSB_RXCSR); 1775 val &= ~(MUSB_RXCSR_DMAENAB 1776 | MUSB_RXCSR_H_AUTOREQ 1777 | MUSB_RXCSR_AUTOCLEAR); 1778 musb_writew(epio, MUSB_RXCSR, val); 1779 } 1780 } 1781 #endif /* Mentor DMA */ 1782 1783 if (!dma) { 1784 /* Unmap the buffer so that CPU can use it */ 1785 usb_hcd_unmap_urb_for_dma(musb_to_hcd(musb), urb); 1786 done = musb_host_packet_rx(musb, urb, 1787 epnum, iso_err); 1788 dev_dbg(musb->controller, "read %spacket\n", done ? "last " : ""); 1789 } 1790 } 1791 1792 finish: 1793 urb->actual_length += xfer_len; 1794 qh->offset += xfer_len; 1795 if (done) { 1796 if (urb->status == -EINPROGRESS) 1797 urb->status = status; 1798 musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); 1799 } 1800 } 1801 1802 /* schedule nodes correspond to peripheral endpoints, like an OHCI QH. 1803 * the software schedule associates multiple such nodes with a given 1804 * host side hardware endpoint + direction; scheduling may activate 1805 * that hardware endpoint. 1806 */ 1807 static int musb_schedule( 1808 struct musb *musb, 1809 struct musb_qh *qh, 1810 int is_in) 1811 { 1812 int idle; 1813 int best_diff; 1814 int best_end, epnum; 1815 struct musb_hw_ep *hw_ep = NULL; 1816 struct list_head *head = NULL; 1817 u8 toggle; 1818 u8 txtype; 1819 struct urb *urb = next_urb(qh); 1820 1821 /* use fixed hardware for control and bulk */ 1822 if (qh->type == USB_ENDPOINT_XFER_CONTROL) { 1823 head = &musb->control; 1824 hw_ep = musb->control_ep; 1825 goto success; 1826 } 1827 1828 /* else, periodic transfers get muxed to other endpoints */ 1829 1830 /* 1831 * We know this qh hasn't been scheduled, so all we need to do 1832 * is choose which hardware endpoint to put it on ... 1833 * 1834 * REVISIT what we really want here is a regular schedule tree 1835 * like e.g. OHCI uses. 1836 */ 1837 best_diff = 4096; 1838 best_end = -1; 1839 1840 for (epnum = 1, hw_ep = musb->endpoints + 1; 1841 epnum < musb->nr_endpoints; 1842 epnum++, hw_ep++) { 1843 int diff; 1844 1845 if (musb_ep_get_qh(hw_ep, is_in) != NULL) 1846 continue; 1847 1848 if (hw_ep == musb->bulk_ep) 1849 continue; 1850 1851 if (is_in) 1852 diff = hw_ep->max_packet_sz_rx; 1853 else 1854 diff = hw_ep->max_packet_sz_tx; 1855 diff -= (qh->maxpacket * qh->hb_mult); 1856 1857 if (diff >= 0 && best_diff > diff) { 1858 1859 /* 1860 * Mentor controller has a bug in that if we schedule 1861 * a BULK Tx transfer on an endpoint that had earlier 1862 * handled ISOC then the BULK transfer has to start on 1863 * a zero toggle. If the BULK transfer starts on a 1 1864 * toggle then this transfer will fail as the mentor 1865 * controller starts the Bulk transfer on a 0 toggle 1866 * irrespective of the programming of the toggle bits 1867 * in the TXCSR register. Check for this condition 1868 * while allocating the EP for a Tx Bulk transfer. If 1869 * so skip this EP. 1870 */ 1871 hw_ep = musb->endpoints + epnum; 1872 toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); 1873 txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) 1874 >> 4) & 0x3; 1875 if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && 1876 toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) 1877 continue; 1878 1879 best_diff = diff; 1880 best_end = epnum; 1881 } 1882 } 1883 /* use bulk reserved ep1 if no other ep is free */ 1884 if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { 1885 hw_ep = musb->bulk_ep; 1886 if (is_in) 1887 head = &musb->in_bulk; 1888 else 1889 head = &musb->out_bulk; 1890 1891 /* Enable bulk RX NAK timeout scheme when bulk requests are 1892 * multiplexed. This scheme doen't work in high speed to full 1893 * speed scenario as NAK interrupts are not coming from a 1894 * full speed device connected to a high speed device. 1895 * NAK timeout interval is 8 (128 uframe or 16ms) for HS and 1896 * 4 (8 frame or 8ms) for FS device. 1897 */ 1898 if (is_in && qh->dev) 1899 qh->intv_reg = 1900 (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; 1901 goto success; 1902 } else if (best_end < 0) { 1903 return -ENOSPC; 1904 } 1905 1906 idle = 1; 1907 qh->mux = 0; 1908 hw_ep = musb->endpoints + best_end; 1909 dev_dbg(musb->controller, "qh %p periodic slot %d\n", qh, best_end); 1910 success: 1911 if (head) { 1912 idle = list_empty(head); 1913 list_add_tail(&qh->ring, head); 1914 qh->mux = 1; 1915 } 1916 qh->hw_ep = hw_ep; 1917 qh->hep->hcpriv = qh; 1918 if (idle) 1919 musb_start_urb(musb, is_in, qh); 1920 return 0; 1921 } 1922 1923 #ifdef __UBOOT__ 1924 /* check if transaction translator is needed for device */ 1925 static int tt_needed(struct musb *musb, struct usb_device *dev) 1926 { 1927 if ((musb_readb(musb->mregs, MUSB_POWER) & MUSB_POWER_HSMODE) && 1928 (dev->speed < USB_SPEED_HIGH)) 1929 return 1; 1930 return 0; 1931 } 1932 #endif 1933 1934 #ifndef __UBOOT__ 1935 static int musb_urb_enqueue( 1936 #else 1937 int musb_urb_enqueue( 1938 #endif 1939 struct usb_hcd *hcd, 1940 struct urb *urb, 1941 gfp_t mem_flags) 1942 { 1943 unsigned long flags; 1944 struct musb *musb = hcd_to_musb(hcd); 1945 struct usb_host_endpoint *hep = urb->ep; 1946 struct musb_qh *qh; 1947 struct usb_endpoint_descriptor *epd = &hep->desc; 1948 int ret; 1949 unsigned type_reg; 1950 unsigned interval; 1951 1952 /* host role must be active */ 1953 if (!is_host_active(musb) || !musb->is_active) 1954 return -ENODEV; 1955 1956 spin_lock_irqsave(&musb->lock, flags); 1957 ret = usb_hcd_link_urb_to_ep(hcd, urb); 1958 qh = ret ? NULL : hep->hcpriv; 1959 if (qh) 1960 urb->hcpriv = qh; 1961 spin_unlock_irqrestore(&musb->lock, flags); 1962 1963 /* DMA mapping was already done, if needed, and this urb is on 1964 * hep->urb_list now ... so we're done, unless hep wasn't yet 1965 * scheduled onto a live qh. 1966 * 1967 * REVISIT best to keep hep->hcpriv valid until the endpoint gets 1968 * disabled, testing for empty qh->ring and avoiding qh setup costs 1969 * except for the first urb queued after a config change. 1970 */ 1971 if (qh || ret) 1972 return ret; 1973 1974 /* Allocate and initialize qh, minimizing the work done each time 1975 * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. 1976 * 1977 * REVISIT consider a dedicated qh kmem_cache, so it's harder 1978 * for bugs in other kernel code to break this driver... 1979 */ 1980 qh = kzalloc(sizeof *qh, mem_flags); 1981 if (!qh) { 1982 spin_lock_irqsave(&musb->lock, flags); 1983 usb_hcd_unlink_urb_from_ep(hcd, urb); 1984 spin_unlock_irqrestore(&musb->lock, flags); 1985 return -ENOMEM; 1986 } 1987 1988 qh->hep = hep; 1989 qh->dev = urb->dev; 1990 INIT_LIST_HEAD(&qh->ring); 1991 qh->is_ready = 1; 1992 1993 qh->maxpacket = usb_endpoint_maxp(epd); 1994 qh->type = usb_endpoint_type(epd); 1995 1996 /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. 1997 * Some musb cores don't support high bandwidth ISO transfers; and 1998 * we don't (yet!) support high bandwidth interrupt transfers. 1999 */ 2000 qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03); 2001 if (qh->hb_mult > 1) { 2002 int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); 2003 2004 if (ok) 2005 ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) 2006 || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); 2007 if (!ok) { 2008 ret = -EMSGSIZE; 2009 goto done; 2010 } 2011 qh->maxpacket &= 0x7ff; 2012 } 2013 2014 qh->epnum = usb_endpoint_num(epd); 2015 2016 /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ 2017 qh->addr_reg = (u8) usb_pipedevice(urb->pipe); 2018 2019 /* precompute rxtype/txtype/type0 register */ 2020 type_reg = (qh->type << 4) | qh->epnum; 2021 switch (urb->dev->speed) { 2022 case USB_SPEED_LOW: 2023 type_reg |= 0xc0; 2024 break; 2025 case USB_SPEED_FULL: 2026 type_reg |= 0x80; 2027 break; 2028 default: 2029 type_reg |= 0x40; 2030 } 2031 qh->type_reg = type_reg; 2032 2033 /* Precompute RXINTERVAL/TXINTERVAL register */ 2034 switch (qh->type) { 2035 case USB_ENDPOINT_XFER_INT: 2036 /* 2037 * Full/low speeds use the linear encoding, 2038 * high speed uses the logarithmic encoding. 2039 */ 2040 if (urb->dev->speed <= USB_SPEED_FULL) { 2041 interval = max_t(u8, epd->bInterval, 1); 2042 break; 2043 } 2044 /* FALLTHROUGH */ 2045 case USB_ENDPOINT_XFER_ISOC: 2046 /* ISO always uses logarithmic encoding */ 2047 interval = min_t(u8, epd->bInterval, 16); 2048 break; 2049 default: 2050 /* REVISIT we actually want to use NAK limits, hinting to the 2051 * transfer scheduling logic to try some other qh, e.g. try 2052 * for 2 msec first: 2053 * 2054 * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; 2055 * 2056 * The downside of disabling this is that transfer scheduling 2057 * gets VERY unfair for nonperiodic transfers; a misbehaving 2058 * peripheral could make that hurt. That's perfectly normal 2059 * for reads from network or serial adapters ... so we have 2060 * partial NAKlimit support for bulk RX. 2061 * 2062 * The upside of disabling it is simpler transfer scheduling. 2063 */ 2064 interval = 0; 2065 } 2066 qh->intv_reg = interval; 2067 2068 /* precompute addressing for external hub/tt ports */ 2069 if (musb->is_multipoint) { 2070 #ifndef __UBOOT__ 2071 struct usb_device *parent = urb->dev->parent; 2072 #else 2073 struct usb_device *parent = usb_dev_get_parent(urb->dev); 2074 #endif 2075 2076 #ifndef __UBOOT__ 2077 if (parent != hcd->self.root_hub) { 2078 #else 2079 if (parent) { 2080 #endif 2081 qh->h_addr_reg = (u8) parent->devnum; 2082 2083 #ifndef __UBOOT__ 2084 /* set up tt info if needed */ 2085 if (urb->dev->tt) { 2086 qh->h_port_reg = (u8) urb->dev->ttport; 2087 if (urb->dev->tt->hub) 2088 qh->h_addr_reg = 2089 (u8) urb->dev->tt->hub->devnum; 2090 if (urb->dev->tt->multi) 2091 qh->h_addr_reg |= 0x80; 2092 } 2093 #else 2094 if (tt_needed(musb, urb->dev)) { 2095 u16 hub_port = find_tt(urb->dev); 2096 qh->h_addr_reg = (u8) (hub_port >> 8); 2097 qh->h_port_reg = (u8) (hub_port & 0xff); 2098 } 2099 #endif 2100 } 2101 } 2102 2103 /* invariant: hep->hcpriv is null OR the qh that's already scheduled. 2104 * until we get real dma queues (with an entry for each urb/buffer), 2105 * we only have work to do in the former case. 2106 */ 2107 spin_lock_irqsave(&musb->lock, flags); 2108 if (hep->hcpriv) { 2109 /* some concurrent activity submitted another urb to hep... 2110 * odd, rare, error prone, but legal. 2111 */ 2112 kfree(qh); 2113 qh = NULL; 2114 ret = 0; 2115 } else 2116 ret = musb_schedule(musb, qh, 2117 epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); 2118 2119 if (ret == 0) { 2120 urb->hcpriv = qh; 2121 /* FIXME set urb->start_frame for iso/intr, it's tested in 2122 * musb_start_urb(), but otherwise only konicawc cares ... 2123 */ 2124 } 2125 spin_unlock_irqrestore(&musb->lock, flags); 2126 2127 done: 2128 if (ret != 0) { 2129 spin_lock_irqsave(&musb->lock, flags); 2130 usb_hcd_unlink_urb_from_ep(hcd, urb); 2131 spin_unlock_irqrestore(&musb->lock, flags); 2132 kfree(qh); 2133 } 2134 return ret; 2135 } 2136 2137 /* 2138 * abort a transfer that's at the head of a hardware queue. 2139 * called with controller locked, irqs blocked 2140 * that hardware queue advances to the next transfer, unless prevented 2141 */ 2142 static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) 2143 { 2144 struct musb_hw_ep *ep = qh->hw_ep; 2145 struct musb *musb = ep->musb; 2146 void __iomem *epio = ep->regs; 2147 unsigned hw_end = ep->epnum; 2148 void __iomem *regs = ep->musb->mregs; 2149 int is_in = usb_pipein(urb->pipe); 2150 int status = 0; 2151 u16 csr; 2152 2153 musb_ep_select(regs, hw_end); 2154 2155 if (is_dma_capable()) { 2156 struct dma_channel *dma; 2157 2158 dma = is_in ? ep->rx_channel : ep->tx_channel; 2159 if (dma) { 2160 status = ep->musb->dma_controller->channel_abort(dma); 2161 dev_dbg(musb->controller, 2162 "abort %cX%d DMA for urb %p --> %d\n", 2163 is_in ? 'R' : 'T', ep->epnum, 2164 urb, status); 2165 urb->actual_length += dma->actual_len; 2166 } 2167 } 2168 2169 /* turn off DMA requests, discard state, stop polling ... */ 2170 if (ep->epnum && is_in) { 2171 /* giveback saves bulk toggle */ 2172 csr = musb_h_flush_rxfifo(ep, 0); 2173 2174 /* REVISIT we still get an irq; should likely clear the 2175 * endpoint's irq status here to avoid bogus irqs. 2176 * clearing that status is platform-specific... 2177 */ 2178 } else if (ep->epnum) { 2179 musb_h_tx_flush_fifo(ep); 2180 csr = musb_readw(epio, MUSB_TXCSR); 2181 csr &= ~(MUSB_TXCSR_AUTOSET 2182 | MUSB_TXCSR_DMAENAB 2183 | MUSB_TXCSR_H_RXSTALL 2184 | MUSB_TXCSR_H_NAKTIMEOUT 2185 | MUSB_TXCSR_H_ERROR 2186 | MUSB_TXCSR_TXPKTRDY); 2187 musb_writew(epio, MUSB_TXCSR, csr); 2188 /* REVISIT may need to clear FLUSHFIFO ... */ 2189 musb_writew(epio, MUSB_TXCSR, csr); 2190 /* flush cpu writebuffer */ 2191 csr = musb_readw(epio, MUSB_TXCSR); 2192 } else { 2193 musb_h_ep0_flush_fifo(ep); 2194 } 2195 if (status == 0) 2196 musb_advance_schedule(ep->musb, urb, ep, is_in); 2197 return status; 2198 } 2199 2200 #ifndef __UBOOT__ 2201 static int musb_urb_dequeue( 2202 #else 2203 int musb_urb_dequeue( 2204 #endif 2205 struct usb_hcd *hcd, 2206 struct urb *urb, 2207 int status) 2208 { 2209 struct musb *musb = hcd_to_musb(hcd); 2210 struct musb_qh *qh; 2211 unsigned long flags; 2212 int is_in = usb_pipein(urb->pipe); 2213 int ret; 2214 2215 dev_dbg(musb->controller, "urb=%p, dev%d ep%d%s\n", urb, 2216 usb_pipedevice(urb->pipe), 2217 usb_pipeendpoint(urb->pipe), 2218 is_in ? "in" : "out"); 2219 2220 spin_lock_irqsave(&musb->lock, flags); 2221 ret = usb_hcd_check_unlink_urb(hcd, urb, status); 2222 if (ret) 2223 goto done; 2224 2225 qh = urb->hcpriv; 2226 if (!qh) 2227 goto done; 2228 2229 /* 2230 * Any URB not actively programmed into endpoint hardware can be 2231 * immediately given back; that's any URB not at the head of an 2232 * endpoint queue, unless someday we get real DMA queues. And even 2233 * if it's at the head, it might not be known to the hardware... 2234 * 2235 * Otherwise abort current transfer, pending DMA, etc.; urb->status 2236 * has already been updated. This is a synchronous abort; it'd be 2237 * OK to hold off until after some IRQ, though. 2238 * 2239 * NOTE: qh is invalid unless !list_empty(&hep->urb_list) 2240 */ 2241 if (!qh->is_ready 2242 || urb->urb_list.prev != &qh->hep->urb_list 2243 || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { 2244 int ready = qh->is_ready; 2245 2246 qh->is_ready = 0; 2247 musb_giveback(musb, urb, 0); 2248 qh->is_ready = ready; 2249 2250 /* If nothing else (usually musb_giveback) is using it 2251 * and its URB list has emptied, recycle this qh. 2252 */ 2253 if (ready && list_empty(&qh->hep->urb_list)) { 2254 qh->hep->hcpriv = NULL; 2255 list_del(&qh->ring); 2256 kfree(qh); 2257 } 2258 } else 2259 ret = musb_cleanup_urb(urb, qh); 2260 done: 2261 spin_unlock_irqrestore(&musb->lock, flags); 2262 return ret; 2263 } 2264 2265 #ifndef __UBOOT__ 2266 /* disable an endpoint */ 2267 static void 2268 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) 2269 { 2270 u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; 2271 unsigned long flags; 2272 struct musb *musb = hcd_to_musb(hcd); 2273 struct musb_qh *qh; 2274 struct urb *urb; 2275 2276 spin_lock_irqsave(&musb->lock, flags); 2277 2278 qh = hep->hcpriv; 2279 if (qh == NULL) 2280 goto exit; 2281 2282 /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ 2283 2284 /* Kick the first URB off the hardware, if needed */ 2285 qh->is_ready = 0; 2286 if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { 2287 urb = next_urb(qh); 2288 2289 /* make software (then hardware) stop ASAP */ 2290 if (!urb->unlinked) 2291 urb->status = -ESHUTDOWN; 2292 2293 /* cleanup */ 2294 musb_cleanup_urb(urb, qh); 2295 2296 /* Then nuke all the others ... and advance the 2297 * queue on hw_ep (e.g. bulk ring) when we're done. 2298 */ 2299 while (!list_empty(&hep->urb_list)) { 2300 urb = next_urb(qh); 2301 urb->status = -ESHUTDOWN; 2302 musb_advance_schedule(musb, urb, qh->hw_ep, is_in); 2303 } 2304 } else { 2305 /* Just empty the queue; the hardware is busy with 2306 * other transfers, and since !qh->is_ready nothing 2307 * will activate any of these as it advances. 2308 */ 2309 while (!list_empty(&hep->urb_list)) 2310 musb_giveback(musb, next_urb(qh), -ESHUTDOWN); 2311 2312 hep->hcpriv = NULL; 2313 list_del(&qh->ring); 2314 kfree(qh); 2315 } 2316 exit: 2317 spin_unlock_irqrestore(&musb->lock, flags); 2318 } 2319 2320 static int musb_h_get_frame_number(struct usb_hcd *hcd) 2321 { 2322 struct musb *musb = hcd_to_musb(hcd); 2323 2324 return musb_readw(musb->mregs, MUSB_FRAME); 2325 } 2326 2327 static int musb_h_start(struct usb_hcd *hcd) 2328 { 2329 struct musb *musb = hcd_to_musb(hcd); 2330 2331 /* NOTE: musb_start() is called when the hub driver turns 2332 * on port power, or when (OTG) peripheral starts. 2333 */ 2334 hcd->state = HC_STATE_RUNNING; 2335 musb->port1_status = 0; 2336 return 0; 2337 } 2338 2339 static void musb_h_stop(struct usb_hcd *hcd) 2340 { 2341 musb_stop(hcd_to_musb(hcd)); 2342 hcd->state = HC_STATE_HALT; 2343 } 2344 2345 static int musb_bus_suspend(struct usb_hcd *hcd) 2346 { 2347 struct musb *musb = hcd_to_musb(hcd); 2348 u8 devctl; 2349 2350 if (!is_host_active(musb)) 2351 return 0; 2352 2353 switch (musb->xceiv->state) { 2354 case OTG_STATE_A_SUSPEND: 2355 return 0; 2356 case OTG_STATE_A_WAIT_VRISE: 2357 /* ID could be grounded even if there's no device 2358 * on the other end of the cable. NOTE that the 2359 * A_WAIT_VRISE timers are messy with MUSB... 2360 */ 2361 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 2362 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) 2363 musb->xceiv->state = OTG_STATE_A_WAIT_BCON; 2364 break; 2365 default: 2366 break; 2367 } 2368 2369 if (musb->is_active) { 2370 WARNING("trying to suspend as %s while active\n", 2371 otg_state_string(musb->xceiv->state)); 2372 return -EBUSY; 2373 } else 2374 return 0; 2375 } 2376 2377 static int musb_bus_resume(struct usb_hcd *hcd) 2378 { 2379 /* resuming child port does the work */ 2380 return 0; 2381 } 2382 2383 const struct hc_driver musb_hc_driver = { 2384 .description = "musb-hcd", 2385 .product_desc = "MUSB HDRC host driver", 2386 .hcd_priv_size = sizeof(struct musb), 2387 .flags = HCD_USB2 | HCD_MEMORY, 2388 2389 /* not using irq handler or reset hooks from usbcore, since 2390 * those must be shared with peripheral code for OTG configs 2391 */ 2392 2393 .start = musb_h_start, 2394 .stop = musb_h_stop, 2395 2396 .get_frame_number = musb_h_get_frame_number, 2397 2398 .urb_enqueue = musb_urb_enqueue, 2399 .urb_dequeue = musb_urb_dequeue, 2400 .endpoint_disable = musb_h_disable, 2401 2402 .hub_status_data = musb_hub_status_data, 2403 .hub_control = musb_hub_control, 2404 .bus_suspend = musb_bus_suspend, 2405 .bus_resume = musb_bus_resume, 2406 /* .start_port_reset = NULL, */ 2407 /* .hub_irq_enable = NULL, */ 2408 }; 2409 #endif 2410