1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget 4 * 5 * epn.c - Generic endpoints management 6 * 7 * Copyright 2017 IBM Corporation 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 #include <linux/delay.h> 14 #include <linux/ioport.h> 15 #include <linux/slab.h> 16 #include <linux/errno.h> 17 #include <linux/list.h> 18 #include <linux/interrupt.h> 19 #include <linux/proc_fs.h> 20 #include <linux/prefetch.h> 21 #include <linux/clk.h> 22 #include <linux/usb/gadget.h> 23 #include <linux/of.h> 24 #include <linux/of_gpio.h> 25 #include <linux/regmap.h> 26 #include <linux/dma-mapping.h> 27 28 #include "vhub.h" 29 30 #define EXTRA_CHECKS 31 32 #ifdef EXTRA_CHECKS 33 #define CHECK(ep, expr, fmt...) \ 34 do { \ 35 if (!(expr)) EPDBG(ep, "CHECK:" fmt); \ 36 } while(0) 37 #else 38 #define CHECK(ep, expr, fmt...) do { } while(0) 39 #endif 40 41 static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req) 42 { 43 unsigned int act = req->req.actual; 44 unsigned int len = req->req.length; 45 unsigned int chunk; 46 47 /* There should be no DMA ongoing */ 48 WARN_ON(req->active); 49 50 /* Calculate next chunk size */ 51 chunk = len - act; 52 if (chunk > ep->ep.maxpacket) 53 chunk = ep->ep.maxpacket; 54 else if ((chunk < ep->ep.maxpacket) || !req->req.zero) 55 req->last_desc = 1; 56 57 EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n", 58 req, act, len, chunk, req->last_desc); 59 60 /* If DMA unavailable, using staging EP buffer */ 61 if (!req->req.dma) { 62 63 /* For IN transfers, copy data over first */ 64 if (ep->epn.is_in) { 65 memcpy(ep->buf, req->req.buf + act, chunk); 66 vhub_dma_workaround(ep->buf); 67 } 68 writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE); 69 } else { 70 if (ep->epn.is_in) 71 vhub_dma_workaround(req->req.buf); 72 writel(req->req.dma + act, ep->epn.regs + AST_VHUB_EP_DESC_BASE); 73 } 74 75 /* Start DMA */ 76 req->active = true; 77 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk), 78 ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 79 writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK, 80 ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 81 } 82 83 static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep) 84 { 85 struct ast_vhub_req *req; 86 unsigned int len; 87 u32 stat; 88 89 /* Read EP status */ 90 stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 91 92 /* Grab current request if any */ 93 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); 94 95 EPVDBG(ep, "ACK status=%08x is_in=%d, req=%p (active=%d)\n", 96 stat, ep->epn.is_in, req, req ? req->active : 0); 97 98 /* In absence of a request, bail out, must have been dequeued */ 99 if (!req) 100 return; 101 102 /* 103 * Request not active, move on to processing queue, active request 104 * was probably dequeued 105 */ 106 if (!req->active) 107 goto next_chunk; 108 109 /* Check if HW has moved on */ 110 if (VHUB_EP_DMA_RPTR(stat) != 0) { 111 EPDBG(ep, "DMA read pointer not 0 !\n"); 112 return; 113 } 114 115 /* No current DMA ongoing */ 116 req->active = false; 117 118 /* Grab length out of HW */ 119 len = VHUB_EP_DMA_TX_SIZE(stat); 120 121 /* If not using DMA, copy data out if needed */ 122 if (!req->req.dma && !ep->epn.is_in && len) 123 memcpy(req->req.buf + req->req.actual, ep->buf, len); 124 125 /* Adjust size */ 126 req->req.actual += len; 127 128 /* Check for short packet */ 129 if (len < ep->ep.maxpacket) 130 req->last_desc = 1; 131 132 /* That's it ? complete the request and pick a new one */ 133 if (req->last_desc >= 0) { 134 ast_vhub_done(ep, req, 0); 135 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, 136 queue); 137 138 /* 139 * Due to lock dropping inside "done" the next request could 140 * already be active, so check for that and bail if needed. 141 */ 142 if (!req || req->active) 143 return; 144 } 145 146 next_chunk: 147 ast_vhub_epn_kick(ep, req); 148 } 149 150 static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep) 151 { 152 /* 153 * d_next == d_last means descriptor list empty to HW, 154 * thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors 155 * in the list 156 */ 157 return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) & 158 (AST_VHUB_DESCS_COUNT - 1); 159 } 160 161 static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep, 162 struct ast_vhub_req *req) 163 { 164 struct ast_vhub_desc *desc = NULL; 165 unsigned int act = req->act_count; 166 unsigned int len = req->req.length; 167 unsigned int chunk; 168 169 /* Mark request active if not already */ 170 req->active = true; 171 172 /* If the request was already completely written, do nothing */ 173 if (req->last_desc >= 0) 174 return; 175 176 EPVDBG(ep, "kick act=%d/%d chunk_max=%d free_descs=%d\n", 177 act, len, ep->epn.chunk_max, ast_vhub_count_free_descs(ep)); 178 179 /* While we can create descriptors */ 180 while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) { 181 unsigned int d_num; 182 183 /* Grab next free descriptor */ 184 d_num = ep->epn.d_next; 185 desc = &ep->epn.descs[d_num]; 186 ep->epn.d_next = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1); 187 188 /* Calculate next chunk size */ 189 chunk = len - act; 190 if (chunk <= ep->epn.chunk_max) { 191 /* 192 * Is this the last packet ? Because of having up to 8 193 * packets in a descriptor we can't just compare "chunk" 194 * with ep.maxpacket. We have to see if it's a multiple 195 * of it to know if we have to send a zero packet. 196 * Sadly that involves a modulo which is a bit expensive 197 * but probably still better than not doing it. 198 */ 199 if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0) 200 req->last_desc = d_num; 201 } else { 202 chunk = ep->epn.chunk_max; 203 } 204 205 EPVDBG(ep, " chunk: act=%d/%d chunk=%d last=%d desc=%d free=%d\n", 206 act, len, chunk, req->last_desc, d_num, 207 ast_vhub_count_free_descs(ep)); 208 209 /* Populate descriptor */ 210 desc->w0 = cpu_to_le32(req->req.dma + act); 211 212 /* Interrupt if end of request or no more descriptors */ 213 214 /* 215 * TODO: Be smarter about it, if we don't have enough 216 * descriptors request an interrupt before queue empty 217 * or so in order to be able to populate more before 218 * the HW runs out. This isn't a problem at the moment 219 * as we use 256 descriptors and only put at most one 220 * request in the ring. 221 */ 222 desc->w1 = cpu_to_le32(VHUB_DSC1_IN_SET_LEN(chunk)); 223 if (req->last_desc >= 0 || !ast_vhub_count_free_descs(ep)) 224 desc->w1 |= cpu_to_le32(VHUB_DSC1_IN_INTERRUPT); 225 226 /* Account packet */ 227 req->act_count = act = act + chunk; 228 } 229 230 if (likely(desc)) 231 vhub_dma_workaround(desc); 232 233 /* Tell HW about new descriptors */ 234 writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next), 235 ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 236 237 EPVDBG(ep, "HW kicked, d_next=%d dstat=%08x\n", 238 ep->epn.d_next, readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS)); 239 } 240 241 static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep) 242 { 243 struct ast_vhub_req *req; 244 unsigned int len, d_last; 245 u32 stat, stat1; 246 247 /* Read EP status, workaround HW race */ 248 do { 249 stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 250 stat1 = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 251 } while(stat != stat1); 252 253 /* Extract RPTR */ 254 d_last = VHUB_EP_DMA_RPTR(stat); 255 256 /* Grab current request if any */ 257 req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); 258 259 EPVDBG(ep, "ACK status=%08x is_in=%d ep->d_last=%d..%d\n", 260 stat, ep->epn.is_in, ep->epn.d_last, d_last); 261 262 /* Check all completed descriptors */ 263 while (ep->epn.d_last != d_last) { 264 struct ast_vhub_desc *desc; 265 unsigned int d_num; 266 bool is_last_desc; 267 268 /* Grab next completed descriptor */ 269 d_num = ep->epn.d_last; 270 desc = &ep->epn.descs[d_num]; 271 ep->epn.d_last = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1); 272 273 /* Grab len out of descriptor */ 274 len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1)); 275 276 EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n", 277 d_num, len, req, req ? req->active : 0); 278 279 /* If no active request pending, move on */ 280 if (!req || !req->active) 281 continue; 282 283 /* Adjust size */ 284 req->req.actual += len; 285 286 /* Is that the last chunk ? */ 287 is_last_desc = req->last_desc == d_num; 288 CHECK(ep, is_last_desc == (len < ep->ep.maxpacket || 289 (req->req.actual >= req->req.length && 290 !req->req.zero)), 291 "Last packet discrepancy: last_desc=%d len=%d r.act=%d " 292 "r.len=%d r.zero=%d mp=%d\n", 293 is_last_desc, len, req->req.actual, req->req.length, 294 req->req.zero, ep->ep.maxpacket); 295 296 if (is_last_desc) { 297 /* 298 * Because we can only have one request at a time 299 * in our descriptor list in this implementation, 300 * d_last and ep->d_last should now be equal 301 */ 302 CHECK(ep, d_last == ep->epn.d_last, 303 "DMA read ptr mismatch %d vs %d\n", 304 d_last, ep->epn.d_last); 305 306 /* Note: done will drop and re-acquire the lock */ 307 ast_vhub_done(ep, req, 0); 308 req = list_first_entry_or_null(&ep->queue, 309 struct ast_vhub_req, 310 queue); 311 break; 312 } 313 } 314 315 /* More work ? */ 316 if (req) 317 ast_vhub_epn_kick_desc(ep, req); 318 } 319 320 void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep) 321 { 322 if (ep->epn.desc_mode) 323 ast_vhub_epn_handle_ack_desc(ep); 324 else 325 ast_vhub_epn_handle_ack(ep); 326 } 327 328 static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req, 329 gfp_t gfp_flags) 330 { 331 struct ast_vhub_req *req = to_ast_req(u_req); 332 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 333 struct ast_vhub *vhub = ep->vhub; 334 unsigned long flags; 335 bool empty; 336 int rc; 337 338 /* Paranoid checks */ 339 if (!u_req || !u_req->complete || !u_req->buf) { 340 dev_warn(&vhub->pdev->dev, "Bogus EPn request ! u_req=%p\n", u_req); 341 if (u_req) { 342 dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n", 343 u_req->complete, req->internal); 344 } 345 return -EINVAL; 346 } 347 348 /* Endpoint enabled ? */ 349 if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx || 350 !ep->dev->enabled) { 351 EPDBG(ep, "Enqueuing request on wrong or disabled EP\n"); 352 return -ESHUTDOWN; 353 } 354 355 /* Map request for DMA if possible. For now, the rule for DMA is 356 * that: 357 * 358 * * For single stage mode (no descriptors): 359 * 360 * - The buffer is aligned to a 8 bytes boundary (HW requirement) 361 * - For a OUT endpoint, the request size is a multiple of the EP 362 * packet size (otherwise the controller will DMA past the end 363 * of the buffer if the host is sending a too long packet). 364 * 365 * * For descriptor mode (tx only for now), always. 366 * 367 * We could relax the latter by making the decision to use the bounce 368 * buffer based on the size of a given *segment* of the request rather 369 * than the whole request. 370 */ 371 if (ep->epn.desc_mode || 372 ((((unsigned long)u_req->buf & 7) == 0) && 373 (ep->epn.is_in || !(u_req->length & (u_ep->maxpacket - 1))))) { 374 rc = usb_gadget_map_request_by_dev(&vhub->pdev->dev, u_req, 375 ep->epn.is_in); 376 if (rc) { 377 dev_warn(&vhub->pdev->dev, 378 "Request mapping failure %d\n", rc); 379 return rc; 380 } 381 } else 382 u_req->dma = 0; 383 384 EPVDBG(ep, "enqueue req @%p\n", req); 385 EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n", 386 u_req->length, (u32)u_req->dma, u_req->zero, 387 u_req->short_not_ok, u_req->no_interrupt, 388 ep->epn.is_in); 389 390 /* Initialize request progress fields */ 391 u_req->status = -EINPROGRESS; 392 u_req->actual = 0; 393 req->act_count = 0; 394 req->active = false; 395 req->last_desc = -1; 396 spin_lock_irqsave(&vhub->lock, flags); 397 empty = list_empty(&ep->queue); 398 399 /* Add request to list and kick processing if empty */ 400 list_add_tail(&req->queue, &ep->queue); 401 if (empty) { 402 if (ep->epn.desc_mode) 403 ast_vhub_epn_kick_desc(ep, req); 404 else 405 ast_vhub_epn_kick(ep, req); 406 } 407 spin_unlock_irqrestore(&vhub->lock, flags); 408 409 return 0; 410 } 411 412 static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep, 413 bool restart_ep) 414 { 415 u32 state, reg, loops; 416 417 /* Stop DMA activity */ 418 if (ep->epn.desc_mode) 419 writel(VHUB_EP_DMA_CTRL_RESET, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 420 else 421 writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 422 423 /* Wait for it to complete */ 424 for (loops = 0; loops < 1000; loops++) { 425 state = readl(ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 426 state = VHUB_EP_DMA_PROC_STATUS(state); 427 if (state == EP_DMA_PROC_RX_IDLE || 428 state == EP_DMA_PROC_TX_IDLE) 429 break; 430 udelay(1); 431 } 432 if (loops >= 1000) 433 dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n"); 434 435 /* If we don't have to restart the endpoint, that's it */ 436 if (!restart_ep) 437 return; 438 439 /* Restart the endpoint */ 440 if (ep->epn.desc_mode) { 441 /* 442 * Take out descriptors by resetting the DMA read 443 * pointer to be equal to the CPU write pointer. 444 * 445 * Note: If we ever support creating descriptors for 446 * requests that aren't the head of the queue, we 447 * may have to do something more complex here, 448 * especially if the request being taken out is 449 * not the current head descriptors. 450 */ 451 reg = VHUB_EP_DMA_SET_RPTR(ep->epn.d_next) | 452 VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next); 453 writel(reg, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 454 455 /* Then turn it back on */ 456 writel(ep->epn.dma_conf, 457 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 458 } else { 459 /* Single mode: just turn it back on */ 460 writel(ep->epn.dma_conf, 461 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 462 } 463 } 464 465 static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req) 466 { 467 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 468 struct ast_vhub *vhub = ep->vhub; 469 struct ast_vhub_req *req = NULL, *iter; 470 unsigned long flags; 471 int rc = -EINVAL; 472 473 spin_lock_irqsave(&vhub->lock, flags); 474 475 /* Make sure it's actually queued on this endpoint */ 476 list_for_each_entry(iter, &ep->queue, queue) { 477 if (&iter->req != u_req) 478 continue; 479 req = iter; 480 break; 481 } 482 483 if (req) { 484 EPVDBG(ep, "dequeue req @%p active=%d\n", 485 req, req->active); 486 if (req->active) 487 ast_vhub_stop_active_req(ep, true); 488 ast_vhub_done(ep, req, -ECONNRESET); 489 rc = 0; 490 } 491 492 spin_unlock_irqrestore(&vhub->lock, flags); 493 return rc; 494 } 495 496 void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep) 497 { 498 u32 reg; 499 500 if (WARN_ON(ep->d_idx == 0)) 501 return; 502 reg = readl(ep->epn.regs + AST_VHUB_EP_CONFIG); 503 if (ep->epn.stalled || ep->epn.wedged) 504 reg |= VHUB_EP_CFG_STALL_CTRL; 505 else 506 reg &= ~VHUB_EP_CFG_STALL_CTRL; 507 writel(reg, ep->epn.regs + AST_VHUB_EP_CONFIG); 508 509 if (!ep->epn.stalled && !ep->epn.wedged) 510 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx), 511 ep->vhub->regs + AST_VHUB_EP_TOGGLE); 512 } 513 514 static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt, 515 bool wedge) 516 { 517 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 518 struct ast_vhub *vhub = ep->vhub; 519 unsigned long flags; 520 521 EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge); 522 523 if (!u_ep || !u_ep->desc) 524 return -EINVAL; 525 if (ep->d_idx == 0) 526 return 0; 527 if (ep->epn.is_iso) 528 return -EOPNOTSUPP; 529 530 spin_lock_irqsave(&vhub->lock, flags); 531 532 /* Fail with still-busy IN endpoints */ 533 if (halt && ep->epn.is_in && !list_empty(&ep->queue)) { 534 spin_unlock_irqrestore(&vhub->lock, flags); 535 return -EAGAIN; 536 } 537 ep->epn.stalled = halt; 538 ep->epn.wedged = wedge; 539 ast_vhub_update_epn_stall(ep); 540 541 spin_unlock_irqrestore(&vhub->lock, flags); 542 543 return 0; 544 } 545 546 static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value) 547 { 548 return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false); 549 } 550 551 static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep) 552 { 553 return ast_vhub_set_halt_and_wedge(u_ep, true, true); 554 } 555 556 static int ast_vhub_epn_disable(struct usb_ep* u_ep) 557 { 558 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 559 struct ast_vhub *vhub = ep->vhub; 560 unsigned long flags; 561 u32 imask, ep_ier; 562 563 EPDBG(ep, "Disabling !\n"); 564 565 spin_lock_irqsave(&vhub->lock, flags); 566 567 ep->epn.enabled = false; 568 569 /* Stop active DMA if any */ 570 ast_vhub_stop_active_req(ep, false); 571 572 /* Disable endpoint */ 573 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG); 574 575 /* Disable ACK interrupt */ 576 imask = VHUB_EP_IRQ(ep->epn.g_idx); 577 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER); 578 ep_ier &= ~imask; 579 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER); 580 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR); 581 582 /* Nuke all pending requests */ 583 ast_vhub_nuke(ep, -ESHUTDOWN); 584 585 /* No more descriptor associated with request */ 586 ep->ep.desc = NULL; 587 588 spin_unlock_irqrestore(&vhub->lock, flags); 589 590 return 0; 591 } 592 593 static int ast_vhub_epn_enable(struct usb_ep* u_ep, 594 const struct usb_endpoint_descriptor *desc) 595 { 596 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 597 struct ast_vhub_dev *dev; 598 struct ast_vhub *vhub; 599 u16 maxpacket, type; 600 unsigned long flags; 601 u32 ep_conf, ep_ier, imask; 602 603 /* Check arguments */ 604 if (!u_ep || !desc) 605 return -EINVAL; 606 607 maxpacket = usb_endpoint_maxp(desc); 608 if (!ep->d_idx || !ep->dev || 609 desc->bDescriptorType != USB_DT_ENDPOINT || 610 maxpacket == 0 || maxpacket > ep->ep.maxpacket) { 611 EPDBG(ep, "Invalid EP enable,d_idx=%d,dev=%p,type=%d,mp=%d/%d\n", 612 ep->d_idx, ep->dev, desc->bDescriptorType, 613 maxpacket, ep->ep.maxpacket); 614 return -EINVAL; 615 } 616 if (ep->d_idx != usb_endpoint_num(desc)) { 617 EPDBG(ep, "EP number mismatch !\n"); 618 return -EINVAL; 619 } 620 621 if (ep->epn.enabled) { 622 EPDBG(ep, "Already enabled\n"); 623 return -EBUSY; 624 } 625 dev = ep->dev; 626 vhub = ep->vhub; 627 628 /* Check device state */ 629 if (!dev->driver) { 630 EPDBG(ep, "Bogus device state: driver=%p speed=%d\n", 631 dev->driver, dev->gadget.speed); 632 return -ESHUTDOWN; 633 } 634 635 /* Grab some info from the descriptor */ 636 ep->epn.is_in = usb_endpoint_dir_in(desc); 637 ep->ep.maxpacket = maxpacket; 638 type = usb_endpoint_type(desc); 639 ep->epn.d_next = ep->epn.d_last = 0; 640 ep->epn.is_iso = false; 641 ep->epn.stalled = false; 642 ep->epn.wedged = false; 643 644 EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n", 645 ep->epn.is_in ? "in" : "out", usb_ep_type_string(type), 646 usb_endpoint_num(desc), maxpacket); 647 648 /* Can we use DMA descriptor mode ? */ 649 ep->epn.desc_mode = ep->epn.descs && ep->epn.is_in; 650 if (ep->epn.desc_mode) 651 memset(ep->epn.descs, 0, 8 * AST_VHUB_DESCS_COUNT); 652 653 /* 654 * Large send function can send up to 8 packets from 655 * one descriptor with a limit of 4095 bytes. 656 */ 657 ep->epn.chunk_max = ep->ep.maxpacket; 658 if (ep->epn.is_in) { 659 ep->epn.chunk_max <<= 3; 660 while (ep->epn.chunk_max > 4095) 661 ep->epn.chunk_max -= ep->ep.maxpacket; 662 } 663 664 switch(type) { 665 case USB_ENDPOINT_XFER_CONTROL: 666 EPDBG(ep, "Only one control endpoint\n"); 667 return -EINVAL; 668 case USB_ENDPOINT_XFER_INT: 669 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT); 670 break; 671 case USB_ENDPOINT_XFER_BULK: 672 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK); 673 break; 674 case USB_ENDPOINT_XFER_ISOC: 675 ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO); 676 ep->epn.is_iso = true; 677 break; 678 default: 679 return -EINVAL; 680 } 681 682 /* Encode the rest of the EP config register */ 683 if (maxpacket < 1024) 684 ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket); 685 if (!ep->epn.is_in) 686 ep_conf |= VHUB_EP_CFG_DIR_OUT; 687 ep_conf |= VHUB_EP_CFG_SET_EP_NUM(usb_endpoint_num(desc)); 688 ep_conf |= VHUB_EP_CFG_ENABLE; 689 ep_conf |= VHUB_EP_CFG_SET_DEV(dev->index + 1); 690 EPVDBG(ep, "config=%08x\n", ep_conf); 691 692 spin_lock_irqsave(&vhub->lock, flags); 693 694 /* Disable HW and reset DMA */ 695 writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG); 696 writel(VHUB_EP_DMA_CTRL_RESET, 697 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 698 699 /* Configure and enable */ 700 writel(ep_conf, ep->epn.regs + AST_VHUB_EP_CONFIG); 701 702 if (ep->epn.desc_mode) { 703 /* Clear DMA status, including the DMA read ptr */ 704 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 705 706 /* Set descriptor base */ 707 writel(ep->epn.descs_dma, 708 ep->epn.regs + AST_VHUB_EP_DESC_BASE); 709 710 /* Set base DMA config value */ 711 ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE; 712 if (ep->epn.is_in) 713 ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE; 714 715 /* First reset and disable all operations */ 716 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET, 717 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 718 719 /* Enable descriptor mode */ 720 writel(ep->epn.dma_conf, 721 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 722 } else { 723 /* Set base DMA config value */ 724 ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE; 725 726 /* Reset and switch to single stage mode */ 727 writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET, 728 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 729 writel(ep->epn.dma_conf, 730 ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); 731 writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); 732 } 733 734 /* Cleanup data toggle just in case */ 735 writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx), 736 vhub->regs + AST_VHUB_EP_TOGGLE); 737 738 /* Cleanup and enable ACK interrupt */ 739 imask = VHUB_EP_IRQ(ep->epn.g_idx); 740 writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR); 741 ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER); 742 ep_ier |= imask; 743 writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER); 744 745 /* Woot, we are online ! */ 746 ep->epn.enabled = true; 747 748 spin_unlock_irqrestore(&vhub->lock, flags); 749 750 return 0; 751 } 752 753 static void ast_vhub_epn_dispose(struct usb_ep *u_ep) 754 { 755 struct ast_vhub_ep *ep = to_ast_ep(u_ep); 756 757 if (WARN_ON(!ep->dev || !ep->d_idx)) 758 return; 759 760 EPDBG(ep, "Releasing endpoint\n"); 761 762 /* Take it out of the EP list */ 763 list_del_init(&ep->ep.ep_list); 764 765 /* Mark the address free in the device */ 766 ep->dev->epns[ep->d_idx - 1] = NULL; 767 768 /* Free name & DMA buffers */ 769 kfree(ep->ep.name); 770 ep->ep.name = NULL; 771 dma_free_coherent(&ep->vhub->pdev->dev, 772 AST_VHUB_EPn_MAX_PACKET + 773 8 * AST_VHUB_DESCS_COUNT, 774 ep->buf, ep->buf_dma); 775 ep->buf = NULL; 776 ep->epn.descs = NULL; 777 778 /* Mark free */ 779 ep->dev = NULL; 780 } 781 782 static const struct usb_ep_ops ast_vhub_epn_ops = { 783 .enable = ast_vhub_epn_enable, 784 .disable = ast_vhub_epn_disable, 785 .dispose = ast_vhub_epn_dispose, 786 .queue = ast_vhub_epn_queue, 787 .dequeue = ast_vhub_epn_dequeue, 788 .set_halt = ast_vhub_epn_set_halt, 789 .set_wedge = ast_vhub_epn_set_wedge, 790 .alloc_request = ast_vhub_alloc_request, 791 .free_request = ast_vhub_free_request, 792 }; 793 794 struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr) 795 { 796 struct ast_vhub *vhub = d->vhub; 797 struct ast_vhub_ep *ep; 798 unsigned long flags; 799 int i; 800 801 /* Find a free one (no device) */ 802 spin_lock_irqsave(&vhub->lock, flags); 803 for (i = 0; i < vhub->max_epns; i++) 804 if (vhub->epns[i].dev == NULL) 805 break; 806 if (i >= vhub->max_epns) { 807 spin_unlock_irqrestore(&vhub->lock, flags); 808 return NULL; 809 } 810 811 /* Set it up */ 812 ep = &vhub->epns[i]; 813 ep->dev = d; 814 spin_unlock_irqrestore(&vhub->lock, flags); 815 816 DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr); 817 INIT_LIST_HEAD(&ep->queue); 818 ep->d_idx = addr; 819 ep->vhub = vhub; 820 ep->ep.ops = &ast_vhub_epn_ops; 821 ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", addr); 822 d->epns[addr-1] = ep; 823 ep->epn.g_idx = i; 824 ep->epn.regs = vhub->regs + 0x200 + (i * 0x10); 825 826 ep->buf = dma_alloc_coherent(&vhub->pdev->dev, 827 AST_VHUB_EPn_MAX_PACKET + 828 8 * AST_VHUB_DESCS_COUNT, 829 &ep->buf_dma, GFP_KERNEL); 830 if (!ep->buf) { 831 kfree(ep->ep.name); 832 ep->ep.name = NULL; 833 return NULL; 834 } 835 ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET; 836 ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET; 837 838 usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EPn_MAX_PACKET); 839 list_add_tail(&ep->ep.ep_list, &d->gadget.ep_list); 840 ep->ep.caps.type_iso = true; 841 ep->ep.caps.type_bulk = true; 842 ep->ep.caps.type_int = true; 843 ep->ep.caps.dir_in = true; 844 ep->ep.caps.dir_out = true; 845 846 return ep; 847 } 848