| 1 | /* |
| 2 | * ADM5120 HCD (Host Controller Driver) for USB |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> |
| 5 | * |
| 6 | * This file was derived from: drivers/usb/host/ohci-q.c |
| 7 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
| 8 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License version 2 as published |
| 12 | * by the Free Software Foundation. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/irq.h> |
| 17 | #include <linux/slab.h> |
| 18 | |
| 19 | /*-------------------------------------------------------------------------*/ |
| 20 | |
| 21 | /* |
| 22 | * URB goes back to driver, and isn't reissued. |
| 23 | * It's completely gone from HC data structures. |
| 24 | * PRECONDITION: ahcd lock held, irqs blocked. |
| 25 | */ |
| 26 | static void |
| 27 | finish_urb(struct admhcd *ahcd, struct urb *urb, int status) |
| 28 | __releases(ahcd->lock) |
| 29 | __acquires(ahcd->lock) |
| 30 | { |
| 31 | urb_priv_free(ahcd, urb->hcpriv); |
| 32 | |
| 33 | if (likely(status == -EINPROGRESS)) |
| 34 | status = 0; |
| 35 | |
| 36 | switch (usb_pipetype(urb->pipe)) { |
| 37 | case PIPE_ISOCHRONOUS: |
| 38 | admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs--; |
| 39 | break; |
| 40 | case PIPE_INTERRUPT: |
| 41 | admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs--; |
| 42 | break; |
| 43 | } |
| 44 | |
| 45 | #ifdef ADMHC_VERBOSE_DEBUG |
| 46 | urb_print(ahcd, urb, "RET", usb_pipeout(urb->pipe), status); |
| 47 | #endif |
| 48 | |
| 49 | /* urb->complete() can reenter this HCD */ |
| 50 | usb_hcd_unlink_urb_from_ep(admhcd_to_hcd(ahcd), urb); |
| 51 | spin_unlock(&ahcd->lock); |
| 52 | usb_hcd_giveback_urb(admhcd_to_hcd(ahcd), urb, status); |
| 53 | spin_lock(&ahcd->lock); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | /*-------------------------------------------------------------------------* |
| 58 | * ED handling functions |
| 59 | *-------------------------------------------------------------------------*/ |
| 60 | |
| 61 | #if 0 /* FIXME */ |
| 62 | /* search for the right schedule branch to use for a periodic ed. |
| 63 | * does some load balancing; returns the branch, or negative errno. |
| 64 | */ |
| 65 | static int balance(struct admhcd *ahcd, int interval, int load) |
| 66 | { |
| 67 | int i, branch = -ENOSPC; |
| 68 | |
| 69 | /* iso periods can be huge; iso tds specify frame numbers */ |
| 70 | if (interval > NUM_INTS) |
| 71 | interval = NUM_INTS; |
| 72 | |
| 73 | /* search for the least loaded schedule branch of that period |
| 74 | * that has enough bandwidth left unreserved. |
| 75 | */ |
| 76 | for (i = 0; i < interval ; i++) { |
| 77 | if (branch < 0 || ahcd->load[branch] > ahcd->load[i]) { |
| 78 | int j; |
| 79 | |
| 80 | /* usb 1.1 says 90% of one frame */ |
| 81 | for (j = i; j < NUM_INTS; j += interval) { |
| 82 | if ((ahcd->load[j] + load) > 900) |
| 83 | break; |
| 84 | } |
| 85 | if (j < NUM_INTS) |
| 86 | continue; |
| 87 | branch = i; |
| 88 | } |
| 89 | } |
| 90 | return branch; |
| 91 | } |
| 92 | #endif |
| 93 | |
| 94 | /*-------------------------------------------------------------------------*/ |
| 95 | |
| 96 | #if 0 /* FIXME */ |
| 97 | /* both iso and interrupt requests have periods; this routine puts them |
| 98 | * into the schedule tree in the apppropriate place. most iso devices use |
| 99 | * 1msec periods, but that's not required. |
| 100 | */ |
| 101 | static void periodic_link(struct admhcd *ahcd, struct ed *ed) |
| 102 | { |
| 103 | unsigned i; |
| 104 | |
| 105 | admhc_vdbg(ahcd, "link %sed %p branch %d [%dus.], interval %d\n", |
| 106 | (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "", |
| 107 | ed, ed->branch, ed->load, ed->interval); |
| 108 | |
| 109 | for (i = ed->branch; i < NUM_INTS; i += ed->interval) { |
| 110 | struct ed **prev = &ahcd->periodic[i]; |
| 111 | __hc32 *prev_p = &ahcd->hcca->int_table[i]; |
| 112 | struct ed *here = *prev; |
| 113 | |
| 114 | /* sorting each branch by period (slow before fast) |
| 115 | * lets us share the faster parts of the tree. |
| 116 | * (plus maybe: put interrupt eds before iso) |
| 117 | */ |
| 118 | while (here && ed != here) { |
| 119 | if (ed->interval > here->interval) |
| 120 | break; |
| 121 | prev = &here->ed_next; |
| 122 | prev_p = &here->hwNextED; |
| 123 | here = *prev; |
| 124 | } |
| 125 | if (ed != here) { |
| 126 | ed->ed_next = here; |
| 127 | if (here) |
| 128 | ed->hwNextED = *prev_p; |
| 129 | wmb(); |
| 130 | *prev = ed; |
| 131 | *prev_p = cpu_to_hc32(ahcd, ed->dma); |
| 132 | wmb(); |
| 133 | } |
| 134 | ahcd->load[i] += ed->load; |
| 135 | } |
| 136 | admhcd_to_hcd(ahcd)->self.bandwidth_allocated += ed->load / ed->interval; |
| 137 | } |
| 138 | #endif |
| 139 | |
| 140 | /* link an ed into the HC chain */ |
| 141 | |
| 142 | static int ed_schedule(struct admhcd *ahcd, struct ed *ed) |
| 143 | { |
| 144 | struct ed *old_tail; |
| 145 | |
| 146 | if (admhcd_to_hcd(ahcd)->state == HC_STATE_QUIESCING) |
| 147 | return -EAGAIN; |
| 148 | |
| 149 | ed->state = ED_OPER; |
| 150 | |
| 151 | old_tail = ahcd->ed_tails[ed->type]; |
| 152 | |
| 153 | ed->ed_next = old_tail->ed_next; |
| 154 | if (ed->ed_next) { |
| 155 | ed->ed_next->ed_prev = ed; |
| 156 | ed->hwNextED = cpu_to_hc32(ahcd, ed->ed_next->dma); |
| 157 | } |
| 158 | ed->ed_prev = old_tail; |
| 159 | |
| 160 | old_tail->ed_next = ed; |
| 161 | old_tail->hwNextED = cpu_to_hc32(ahcd, ed->dma); |
| 162 | |
| 163 | ahcd->ed_tails[ed->type] = ed; |
| 164 | |
| 165 | admhc_dma_enable(ahcd); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /*-------------------------------------------------------------------------*/ |
| 171 | |
| 172 | #if 0 /* FIXME */ |
| 173 | /* scan the periodic table to find and unlink this ED */ |
| 174 | static void periodic_unlink(struct admhcd *ahcd, struct ed *ed) |
| 175 | { |
| 176 | int i; |
| 177 | |
| 178 | for (i = ed->branch; i < NUM_INTS; i += ed->interval) { |
| 179 | struct ed *temp; |
| 180 | struct ed **prev = &ahcd->periodic[i]; |
| 181 | __hc32 *prev_p = &ahcd->hcca->int_table[i]; |
| 182 | |
| 183 | while (*prev && (temp = *prev) != ed) { |
| 184 | prev_p = &temp->hwNextED; |
| 185 | prev = &temp->ed_next; |
| 186 | } |
| 187 | if (*prev) { |
| 188 | *prev_p = ed->hwNextED; |
| 189 | *prev = ed->ed_next; |
| 190 | } |
| 191 | ahcd->load[i] -= ed->load; |
| 192 | } |
| 193 | |
| 194 | admhcd_to_hcd(ahcd)->self.bandwidth_allocated -= ed->load / ed->interval; |
| 195 | admhc_vdbg(ahcd, "unlink %sed %p branch %d [%dus.], interval %d\n", |
| 196 | (ed->hwINFO & cpu_to_hc32(ahcd, ED_ISO)) ? "iso " : "", |
| 197 | ed, ed->branch, ed->load, ed->interval); |
| 198 | } |
| 199 | #endif |
| 200 | |
| 201 | /* unlink an ed from the HC chain. |
| 202 | * just the link to the ed is unlinked. |
| 203 | * the link from the ed still points to another operational ed or 0 |
| 204 | * so the HC can eventually finish the processing of the unlinked ed |
| 205 | * (assuming it already started that, which needn't be true). |
| 206 | * |
| 207 | * ED_UNLINK is a transient state: the HC may still see this ED, but soon |
| 208 | * it won't. ED_SKIP means the HC will finish its current transaction, |
| 209 | * but won't start anything new. The TD queue may still grow; device |
| 210 | * drivers don't know about this HCD-internal state. |
| 211 | * |
| 212 | * When the HC can't see the ED, something changes ED_UNLINK to one of: |
| 213 | * |
| 214 | * - ED_OPER: when there's any request queued, the ED gets rescheduled |
| 215 | * immediately. HC should be working on them. |
| 216 | * |
| 217 | * - ED_IDLE: when there's no TD queue. there's no reason for the HC |
| 218 | * to care about this ED; safe to disable the endpoint. |
| 219 | * |
| 220 | * When finish_unlinks() runs later, after SOF interrupt, it will often |
| 221 | * complete one or more URB unlinks before making that state change. |
| 222 | */ |
| 223 | static void ed_deschedule(struct admhcd *ahcd, struct ed *ed) |
| 224 | { |
| 225 | |
| 226 | #ifdef ADMHC_VERBOSE_DEBUG |
| 227 | admhc_dump_ed(ahcd, "ED-DESCHED", ed, 1); |
| 228 | #endif |
| 229 | |
| 230 | ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP); |
| 231 | wmb(); |
| 232 | ed->state = ED_UNLINK; |
| 233 | |
| 234 | /* remove this ED from the HC list */ |
| 235 | ed->ed_prev->hwNextED = ed->hwNextED; |
| 236 | |
| 237 | /* and remove it from our list also */ |
| 238 | ed->ed_prev->ed_next = ed->ed_next; |
| 239 | |
| 240 | if (ed->ed_next) |
| 241 | ed->ed_next->ed_prev = ed->ed_prev; |
| 242 | |
| 243 | if (ahcd->ed_tails[ed->type] == ed) |
| 244 | ahcd->ed_tails[ed->type] = ed->ed_prev; |
| 245 | } |
| 246 | |
| 247 | /*-------------------------------------------------------------------------*/ |
| 248 | |
| 249 | static struct ed *ed_create(struct admhcd *ahcd, unsigned int type, u32 info) |
| 250 | { |
| 251 | struct ed *ed; |
| 252 | struct td *td; |
| 253 | |
| 254 | ed = ed_alloc(ahcd, GFP_ATOMIC); |
| 255 | if (!ed) |
| 256 | goto err; |
| 257 | |
| 258 | /* dummy td; end of td list for this ed */ |
| 259 | td = td_alloc(ahcd, GFP_ATOMIC); |
| 260 | if (!td) |
| 261 | goto err_free_ed; |
| 262 | |
| 263 | switch (type) { |
| 264 | case PIPE_INTERRUPT: |
| 265 | info |= ED_INT; |
| 266 | break; |
| 267 | case PIPE_ISOCHRONOUS: |
| 268 | info |= ED_ISO; |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | ed->dummy = td; |
| 273 | ed->state = ED_IDLE; |
| 274 | ed->type = type; |
| 275 | |
| 276 | ed->hwINFO = cpu_to_hc32(ahcd, info); |
| 277 | ed->hwTailP = cpu_to_hc32(ahcd, td->td_dma); |
| 278 | ed->hwHeadP = ed->hwTailP; /* ED_C, ED_H zeroed */ |
| 279 | |
| 280 | return ed; |
| 281 | |
| 282 | err_free_ed: |
| 283 | ed_free(ahcd, ed); |
| 284 | err: |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | /* get and maybe (re)init an endpoint. init _should_ be done only as part |
| 289 | * of enumeration, usb_set_configuration() or usb_set_interface(). |
| 290 | */ |
| 291 | static struct ed *ed_get(struct admhcd *ahcd, struct usb_host_endpoint *ep, |
| 292 | struct usb_device *udev, unsigned int pipe, int interval) |
| 293 | { |
| 294 | struct ed *ed; |
| 295 | unsigned long flags; |
| 296 | |
| 297 | spin_lock_irqsave(&ahcd->lock, flags); |
| 298 | |
| 299 | ed = ep->hcpriv; |
| 300 | if (!ed) { |
| 301 | u32 info; |
| 302 | |
| 303 | /* FIXME: usbcore changes dev->devnum before SET_ADDRESS |
| 304 | * succeeds ... otherwise we wouldn't need "pipe". |
| 305 | */ |
| 306 | info = usb_pipedevice(pipe); |
| 307 | info |= (ep->desc.bEndpointAddress & ~USB_DIR_IN) << ED_EN_SHIFT; |
| 308 | info |= le16_to_cpu(ep->desc.wMaxPacketSize) << ED_MPS_SHIFT; |
| 309 | if (udev->speed == USB_SPEED_FULL) |
| 310 | info |= ED_SPEED_FULL; |
| 311 | |
| 312 | ed = ed_create(ahcd, usb_pipetype(pipe), info); |
| 313 | if (ed) |
| 314 | ep->hcpriv = ed; |
| 315 | } |
| 316 | |
| 317 | spin_unlock_irqrestore(&ahcd->lock, flags); |
| 318 | |
| 319 | return ed; |
| 320 | } |
| 321 | |
| 322 | /*-------------------------------------------------------------------------*/ |
| 323 | |
| 324 | /* request unlinking of an endpoint from an operational HC. |
| 325 | * put the ep on the rm_list |
| 326 | * real work is done at the next start frame (SOFI) hardware interrupt |
| 327 | * caller guarantees HCD is running, so hardware access is safe, |
| 328 | * and that ed->state is ED_OPER |
| 329 | */ |
| 330 | static void start_ed_unlink(struct admhcd *ahcd, struct ed *ed) |
| 331 | { |
| 332 | |
| 333 | #ifdef ADMHC_VERBOSE_DEBUG |
| 334 | admhc_dump_ed(ahcd, "ED-UNLINK", ed, 1); |
| 335 | #endif |
| 336 | |
| 337 | ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE); |
| 338 | ed_deschedule(ahcd, ed); |
| 339 | |
| 340 | /* add this ED into the remove list */ |
| 341 | ed->ed_rm_next = ahcd->ed_rm_list; |
| 342 | ahcd->ed_rm_list = ed; |
| 343 | |
| 344 | /* enable SOF interrupt */ |
| 345 | admhc_intr_ack(ahcd, ADMHC_INTR_SOFI); |
| 346 | admhc_intr_enable(ahcd, ADMHC_INTR_SOFI); |
| 347 | /* flush those writes */ |
| 348 | admhc_writel_flush(ahcd); |
| 349 | |
| 350 | /* SOF interrupt might get delayed; record the frame counter value that |
| 351 | * indicates when the HC isn't looking at it, so concurrent unlinks |
| 352 | * behave. frame_no wraps every 2^16 msec, and changes right before |
| 353 | * SOF is triggered. |
| 354 | */ |
| 355 | ed->tick = admhc_frame_no(ahcd) + 1; |
| 356 | } |
| 357 | |
| 358 | /*-------------------------------------------------------------------------* |
| 359 | * TD handling functions |
| 360 | *-------------------------------------------------------------------------*/ |
| 361 | |
| 362 | /* enqueue next TD for this URB (OHCI spec 5.2.8.2) */ |
| 363 | |
| 364 | static void |
| 365 | td_fill(struct admhcd *ahcd, u32 info, dma_addr_t data, int len, |
| 366 | struct urb *urb, int index) |
| 367 | { |
| 368 | struct td *td, *td_pt; |
| 369 | struct urb_priv *urb_priv = urb->hcpriv; |
| 370 | int hash; |
| 371 | u32 cbl = 0; |
| 372 | |
| 373 | #if 1 |
| 374 | if (index == (urb_priv->td_cnt - 1) && |
| 375 | ((urb->transfer_flags & URB_NO_INTERRUPT) == 0)) |
| 376 | cbl |= TD_IE; |
| 377 | #else |
| 378 | if (index == (urb_priv->td_cnt - 1)) |
| 379 | cbl |= TD_IE; |
| 380 | #endif |
| 381 | |
| 382 | /* use this td as the next dummy */ |
| 383 | td_pt = urb_priv->td[index]; |
| 384 | |
| 385 | /* fill the old dummy TD */ |
| 386 | td = urb_priv->td[index] = urb_priv->ed->dummy; |
| 387 | urb_priv->ed->dummy = td_pt; |
| 388 | |
| 389 | td->ed = urb_priv->ed; |
| 390 | td->next_dl_td = NULL; |
| 391 | td->index = index; |
| 392 | td->urb = urb; |
| 393 | td->data_dma = data; |
| 394 | if (!len) |
| 395 | data = 0; |
| 396 | |
| 397 | if (data) |
| 398 | cbl |= (len & TD_BL_MASK); |
| 399 | |
| 400 | info |= TD_OWN; |
| 401 | |
| 402 | /* setup hardware specific fields */ |
| 403 | td->hwINFO = cpu_to_hc32(ahcd, info); |
| 404 | td->hwDBP = cpu_to_hc32(ahcd, data); |
| 405 | td->hwCBL = cpu_to_hc32(ahcd, cbl); |
| 406 | td->hwNextTD = cpu_to_hc32(ahcd, td_pt->td_dma); |
| 407 | |
| 408 | /* append to queue */ |
| 409 | list_add_tail(&td->td_list, &td->ed->td_list); |
| 410 | |
| 411 | /* hash it for later reverse mapping */ |
| 412 | hash = TD_HASH_FUNC(td->td_dma); |
| 413 | td->td_hash = ahcd->td_hash[hash]; |
| 414 | ahcd->td_hash[hash] = td; |
| 415 | |
| 416 | /* HC might read the TD (or cachelines) right away ... */ |
| 417 | wmb(); |
| 418 | td->ed->hwTailP = td->hwNextTD; |
| 419 | } |
| 420 | |
| 421 | /*-------------------------------------------------------------------------*/ |
| 422 | |
| 423 | /* Prepare all TDs of a transfer, and queue them onto the ED. |
| 424 | * Caller guarantees HC is active. |
| 425 | * Usually the ED is already on the schedule, so TDs might be |
| 426 | * processed as soon as they're queued. |
| 427 | */ |
| 428 | static void td_submit_urb(struct admhcd *ahcd, struct urb *urb) |
| 429 | { |
| 430 | struct urb_priv *urb_priv = urb->hcpriv; |
| 431 | dma_addr_t data; |
| 432 | int data_len = urb->transfer_buffer_length; |
| 433 | int cnt = 0; |
| 434 | u32 info = 0; |
| 435 | int is_out = usb_pipeout(urb->pipe); |
| 436 | u32 toggle = 0; |
| 437 | |
| 438 | /* OHCI handles the bulk/interrupt data toggles itself. We just |
| 439 | * use the device toggle bits for resetting, and rely on the fact |
| 440 | * that resetting toggle is meaningless if the endpoint is active. |
| 441 | */ |
| 442 | |
| 443 | if (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), is_out)) { |
| 444 | toggle = TD_T_CARRY; |
| 445 | } else { |
| 446 | toggle = TD_T_DATA0; |
| 447 | usb_settoggle(urb->dev, usb_pipeendpoint (urb->pipe), |
| 448 | is_out, 1); |
| 449 | } |
| 450 | |
| 451 | urb_priv->td_idx = 0; |
| 452 | list_add(&urb_priv->pending, &ahcd->pending); |
| 453 | |
| 454 | if (data_len) |
| 455 | data = urb->transfer_dma; |
| 456 | else |
| 457 | data = 0; |
| 458 | |
| 459 | /* NOTE: TD_CC is set so we can tell which TDs the HC processed by |
| 460 | * using TD_CC_GET, as well as by seeing them on the done list. |
| 461 | * (CC = NotAccessed ... 0x0F, or 0x0E in PSWs for ISO.) |
| 462 | */ |
| 463 | switch (urb_priv->ed->type) { |
| 464 | case PIPE_INTERRUPT: |
| 465 | info = is_out |
| 466 | ? TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_OUT |
| 467 | : TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_IN; |
| 468 | |
| 469 | /* setup service interval and starting frame number */ |
| 470 | info |= (urb->start_frame & TD_FN_MASK); |
| 471 | info |= (urb->interval & TD_ISI_MASK) << TD_ISI_SHIFT; |
| 472 | |
| 473 | td_fill(ahcd, info, data, data_len, urb, cnt); |
| 474 | cnt++; |
| 475 | |
| 476 | admhcd_to_hcd(ahcd)->self.bandwidth_int_reqs++; |
| 477 | break; |
| 478 | |
| 479 | case PIPE_BULK: |
| 480 | info = is_out |
| 481 | ? TD_SCC_NOTACCESSED | TD_DP_OUT |
| 482 | : TD_SCC_NOTACCESSED | TD_DP_IN; |
| 483 | |
| 484 | /* TDs _could_ transfer up to 8K each */ |
| 485 | while (data_len > TD_DATALEN_MAX) { |
| 486 | td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), |
| 487 | data, TD_DATALEN_MAX, urb, cnt); |
| 488 | data += TD_DATALEN_MAX; |
| 489 | data_len -= TD_DATALEN_MAX; |
| 490 | cnt++; |
| 491 | } |
| 492 | |
| 493 | td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), data, |
| 494 | data_len, urb, cnt); |
| 495 | cnt++; |
| 496 | |
| 497 | if ((urb->transfer_flags & URB_ZERO_PACKET) |
| 498 | && (cnt < urb_priv->td_cnt)) { |
| 499 | td_fill(ahcd, info | ((cnt) ? TD_T_CARRY : toggle), |
| 500 | 0, 0, urb, cnt); |
| 501 | cnt++; |
| 502 | } |
| 503 | break; |
| 504 | |
| 505 | /* control manages DATA0/DATA1 toggle per-request; SETUP resets it, |
| 506 | * any DATA phase works normally, and the STATUS ack is special. |
| 507 | */ |
| 508 | case PIPE_CONTROL: |
| 509 | /* fill a TD for the setup */ |
| 510 | info = TD_SCC_NOTACCESSED | TD_DP_SETUP | TD_T_DATA0; |
| 511 | td_fill(ahcd, info, urb->setup_dma, 8, urb, cnt++); |
| 512 | |
| 513 | if (data_len > 0) { |
| 514 | /* fill a TD for the data */ |
| 515 | info = TD_SCC_NOTACCESSED | TD_T_DATA1; |
| 516 | info |= is_out ? TD_DP_OUT : TD_DP_IN; |
| 517 | /* NOTE: mishandles transfers >8K, some >4K */ |
| 518 | td_fill(ahcd, info, data, data_len, urb, cnt++); |
| 519 | } |
| 520 | |
| 521 | /* fill a TD for the ACK */ |
| 522 | info = (is_out || data_len == 0) |
| 523 | ? TD_SCC_NOTACCESSED | TD_DP_IN | TD_T_DATA1 |
| 524 | : TD_SCC_NOTACCESSED | TD_DP_OUT | TD_T_DATA1; |
| 525 | td_fill(ahcd, info, data, 0, urb, cnt++); |
| 526 | |
| 527 | break; |
| 528 | |
| 529 | /* ISO has no retransmit, so no toggle; |
| 530 | * Each TD could handle multiple consecutive frames (interval 1); |
| 531 | * we could often reduce the number of TDs here. |
| 532 | */ |
| 533 | case PIPE_ISOCHRONOUS: |
| 534 | info = is_out |
| 535 | ? TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_OUT |
| 536 | : TD_T_CARRY | TD_SCC_NOTACCESSED | TD_DP_IN; |
| 537 | |
| 538 | for (cnt = 0; cnt < urb->number_of_packets; cnt++) { |
| 539 | int frame = urb->start_frame; |
| 540 | |
| 541 | frame += cnt * urb->interval; |
| 542 | frame &= TD_FN_MASK; |
| 543 | td_fill(ahcd, info | frame, |
| 544 | data + urb->iso_frame_desc[cnt].offset, |
| 545 | urb->iso_frame_desc[cnt].length, urb, cnt); |
| 546 | } |
| 547 | admhcd_to_hcd(ahcd)->self.bandwidth_isoc_reqs++; |
| 548 | break; |
| 549 | } |
| 550 | |
| 551 | if (urb_priv->td_cnt != cnt) |
| 552 | admhc_err(ahcd, "bad number of tds created for urb %p\n", urb); |
| 553 | } |
| 554 | |
| 555 | /*-------------------------------------------------------------------------* |
| 556 | * Done List handling functions |
| 557 | *-------------------------------------------------------------------------*/ |
| 558 | |
| 559 | /* calculate transfer length/status and update the urb */ |
| 560 | static int td_done(struct admhcd *ahcd, struct urb *urb, struct td *td) |
| 561 | { |
| 562 | struct urb_priv *urb_priv = urb->hcpriv; |
| 563 | u32 info; |
| 564 | u32 bl; |
| 565 | u32 tdDBP; |
| 566 | int type = usb_pipetype(urb->pipe); |
| 567 | int cc; |
| 568 | int status = -EINPROGRESS; |
| 569 | |
| 570 | info = hc32_to_cpup(ahcd, &td->hwINFO); |
| 571 | tdDBP = hc32_to_cpup(ahcd, &td->hwDBP); |
| 572 | bl = TD_BL_GET(hc32_to_cpup(ahcd, &td->hwCBL)); |
| 573 | cc = TD_CC_GET(info); |
| 574 | |
| 575 | /* ISO ... drivers see per-TD length/status */ |
| 576 | if (type == PIPE_ISOCHRONOUS) { |
| 577 | /* TODO */ |
| 578 | int dlen = 0; |
| 579 | |
| 580 | /* NOTE: assumes FC in tdINFO == 0, and that |
| 581 | * only the first of 0..MAXPSW psws is used. |
| 582 | */ |
| 583 | if (info & TD_CC) /* hc didn't touch? */ |
| 584 | return status; |
| 585 | |
| 586 | if (usb_pipeout(urb->pipe)) |
| 587 | dlen = urb->iso_frame_desc[td->index].length; |
| 588 | else { |
| 589 | /* short reads are always OK for ISO */ |
| 590 | if (cc == TD_CC_DATAUNDERRUN) |
| 591 | cc = TD_CC_NOERROR; |
| 592 | dlen = tdDBP - td->data_dma + bl; |
| 593 | } |
| 594 | |
| 595 | urb->actual_length += dlen; |
| 596 | urb->iso_frame_desc[td->index].actual_length = dlen; |
| 597 | urb->iso_frame_desc[td->index].status = cc_to_error[cc]; |
| 598 | |
| 599 | if (cc != TD_CC_NOERROR) |
| 600 | admhc_vdbg(ahcd, |
| 601 | "urb %p iso td %p (%d) len %d cc %d\n", |
| 602 | urb, td, 1 + td->index, dlen, cc); |
| 603 | |
| 604 | /* BULK, INT, CONTROL ... drivers see aggregate length/status, |
| 605 | * except that "setup" bytes aren't counted and "short" transfers |
| 606 | * might not be reported as errors. |
| 607 | */ |
| 608 | } else { |
| 609 | /* update packet status if needed (short is normally ok) */ |
| 610 | if (cc == TD_CC_DATAUNDERRUN |
| 611 | && !(urb->transfer_flags & URB_SHORT_NOT_OK)) |
| 612 | cc = TD_CC_NOERROR; |
| 613 | |
| 614 | if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) |
| 615 | status = cc_to_error[cc]; |
| 616 | |
| 617 | |
| 618 | /* count all non-empty packets except control SETUP packet */ |
| 619 | if ((type != PIPE_CONTROL || td->index != 0) && tdDBP != 0) |
| 620 | urb->actual_length += tdDBP - td->data_dma + bl; |
| 621 | |
| 622 | if (cc != TD_CC_NOERROR && cc < TD_CC_HCD0) |
| 623 | admhc_vdbg(ahcd, |
| 624 | "urb %p td %p (%d) cc %d, len=%d/%d\n", |
| 625 | urb, td, td->index, cc, |
| 626 | urb->actual_length, |
| 627 | urb->transfer_buffer_length); |
| 628 | } |
| 629 | |
| 630 | list_del(&td->td_list); |
| 631 | urb_priv->td_idx++; |
| 632 | |
| 633 | return status; |
| 634 | } |
| 635 | |
| 636 | /*-------------------------------------------------------------------------*/ |
| 637 | |
| 638 | static void ed_halted(struct admhcd *ahcd, struct td *td, int cc) |
| 639 | { |
| 640 | struct urb *urb = td->urb; |
| 641 | struct urb_priv *urb_priv = urb->hcpriv; |
| 642 | struct ed *ed = td->ed; |
| 643 | struct list_head *tmp = td->td_list.next; |
| 644 | __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C); |
| 645 | |
| 646 | admhc_dump_ed(ahcd, "ed halted", td->ed, 1); |
| 647 | /* clear ed halt; this is the td that caused it, but keep it inactive |
| 648 | * until its urb->complete() has a chance to clean up. |
| 649 | */ |
| 650 | ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP); |
| 651 | wmb(); |
| 652 | ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H); |
| 653 | |
| 654 | /* Get rid of all later tds from this urb. We don't have |
| 655 | * to be careful: no errors and nothing was transferred. |
| 656 | * Also patch the ed so it looks as if those tds completed normally. |
| 657 | */ |
| 658 | while (tmp != &ed->td_list) { |
| 659 | struct td *next; |
| 660 | |
| 661 | next = list_entry(tmp, struct td, td_list); |
| 662 | tmp = next->td_list.next; |
| 663 | |
| 664 | if (next->urb != urb) |
| 665 | break; |
| 666 | |
| 667 | /* NOTE: if multi-td control DATA segments get supported, |
| 668 | * this urb had one of them, this td wasn't the last td |
| 669 | * in that segment (TD_R clear), this ed halted because |
| 670 | * of a short read, _and_ URB_SHORT_NOT_OK is clear ... |
| 671 | * then we need to leave the control STATUS packet queued |
| 672 | * and clear ED_SKIP. |
| 673 | */ |
| 674 | list_del(&next->td_list); |
| 675 | urb_priv->td_cnt++; |
| 676 | ed->hwHeadP = next->hwNextTD | toggle; |
| 677 | } |
| 678 | |
| 679 | /* help for troubleshooting: report anything that |
| 680 | * looks odd ... that doesn't include protocol stalls |
| 681 | * (or maybe some other things) |
| 682 | */ |
| 683 | switch (cc) { |
| 684 | case TD_CC_DATAUNDERRUN: |
| 685 | if ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0) |
| 686 | break; |
| 687 | /* fallthrough */ |
| 688 | case TD_CC_STALL: |
| 689 | if (usb_pipecontrol(urb->pipe)) |
| 690 | break; |
| 691 | /* fallthrough */ |
| 692 | default: |
| 693 | admhc_dbg(ahcd, |
| 694 | "urb %p path %s ep%d%s %08x cc %d --> status %d\n", |
| 695 | urb, urb->dev->devpath, |
| 696 | usb_pipeendpoint (urb->pipe), |
| 697 | usb_pipein(urb->pipe) ? "in" : "out", |
| 698 | hc32_to_cpu(ahcd, td->hwINFO), |
| 699 | cc, cc_to_error[cc]); |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | /*-------------------------------------------------------------------------*/ |
| 704 | |
| 705 | /* there are some urbs/eds to unlink; called in_irq(), with HCD locked */ |
| 706 | static void |
| 707 | finish_unlinks(struct admhcd *ahcd, u16 tick) |
| 708 | { |
| 709 | struct ed *ed, **last; |
| 710 | |
| 711 | rescan_all: |
| 712 | for (last = &ahcd->ed_rm_list, ed = *last; ed != NULL; ed = *last) { |
| 713 | struct list_head *entry, *tmp; |
| 714 | int completed, modified; |
| 715 | __hc32 *prev; |
| 716 | |
| 717 | /* only take off EDs that the HC isn't using, accounting for |
| 718 | * frame counter wraps and EDs with partially retired TDs |
| 719 | */ |
| 720 | if (likely(HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state))) { |
| 721 | if (tick_before(tick, ed->tick)) { |
| 722 | skip_ed: |
| 723 | last = &ed->ed_rm_next; |
| 724 | continue; |
| 725 | } |
| 726 | #if 0 |
| 727 | if (!list_empty(&ed->td_list)) { |
| 728 | struct td *td; |
| 729 | u32 head; |
| 730 | |
| 731 | td = list_entry(ed->td_list.next, struct td, |
| 732 | td_list); |
| 733 | head = hc32_to_cpu(ahcd, ed->hwHeadP) & |
| 734 | TD_MASK; |
| 735 | |
| 736 | /* INTR_WDH may need to clean up first */ |
| 737 | if (td->td_dma != head) |
| 738 | goto skip_ed; |
| 739 | } |
| 740 | #endif |
| 741 | } |
| 742 | |
| 743 | /* reentrancy: if we drop the schedule lock, someone might |
| 744 | * have modified this list. normally it's just prepending |
| 745 | * entries (which we'd ignore), but paranoia won't hurt. |
| 746 | */ |
| 747 | *last = ed->ed_rm_next; |
| 748 | ed->ed_rm_next = NULL; |
| 749 | modified = 0; |
| 750 | |
| 751 | /* unlink urbs as requested, but rescan the list after |
| 752 | * we call a completion since it might have unlinked |
| 753 | * another (earlier) urb |
| 754 | * |
| 755 | * When we get here, the HC doesn't see this ed. But it |
| 756 | * must not be rescheduled until all completed URBs have |
| 757 | * been given back to the driver. |
| 758 | */ |
| 759 | rescan_this: |
| 760 | completed = 0; |
| 761 | prev = &ed->hwHeadP; |
| 762 | list_for_each_safe(entry, tmp, &ed->td_list) { |
| 763 | struct td *td; |
| 764 | struct urb *urb; |
| 765 | struct urb_priv *urb_priv; |
| 766 | __hc32 savebits; |
| 767 | u32 tdINFO; |
| 768 | int status; |
| 769 | |
| 770 | td = list_entry(entry, struct td, td_list); |
| 771 | urb = td->urb; |
| 772 | urb_priv = td->urb->hcpriv; |
| 773 | |
| 774 | if (!urb->unlinked) { |
| 775 | prev = &td->hwNextTD; |
| 776 | continue; |
| 777 | } |
| 778 | |
| 779 | if ((urb_priv) == NULL) |
| 780 | continue; |
| 781 | |
| 782 | /* patch pointer hc uses */ |
| 783 | savebits = *prev & ~cpu_to_hc32(ahcd, TD_MASK); |
| 784 | *prev = td->hwNextTD | savebits; |
| 785 | /* If this was unlinked, the TD may not have been |
| 786 | * retired ... so manually save dhe data toggle. |
| 787 | * The controller ignores the value we save for |
| 788 | * control and ISO endpoints. |
| 789 | */ |
| 790 | tdINFO = hc32_to_cpup(ahcd, &td->hwINFO); |
| 791 | if ((tdINFO & TD_T) == TD_T_DATA0) |
| 792 | ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_C); |
| 793 | else if ((tdINFO & TD_T) == TD_T_DATA1) |
| 794 | ed->hwHeadP |= cpu_to_hc32(ahcd, ED_C); |
| 795 | |
| 796 | /* HC may have partly processed this TD */ |
| 797 | #ifdef ADMHC_VERBOSE_DEBUG |
| 798 | urb_print(ahcd, urb, "PARTIAL", 0); |
| 799 | #endif |
| 800 | status = td_done(ahcd, urb, td); |
| 801 | |
| 802 | /* if URB is done, clean up */ |
| 803 | if (urb_priv->td_idx == urb_priv->td_cnt) { |
| 804 | modified = completed = 1; |
| 805 | finish_urb(ahcd, urb, status); |
| 806 | } |
| 807 | } |
| 808 | if (completed && !list_empty(&ed->td_list)) |
| 809 | goto rescan_this; |
| 810 | |
| 811 | /* ED's now officially unlinked, hc doesn't see */ |
| 812 | ed->state = ED_IDLE; |
| 813 | ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H); |
| 814 | ed->hwNextED = 0; |
| 815 | wmb(); |
| 816 | ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP | ED_DEQUEUE); |
| 817 | |
| 818 | /* but if there's work queued, reschedule */ |
| 819 | if (!list_empty(&ed->td_list)) { |
| 820 | if (HC_IS_RUNNING(admhcd_to_hcd(ahcd)->state)) |
| 821 | ed_schedule(ahcd, ed); |
| 822 | } |
| 823 | |
| 824 | if (modified) |
| 825 | goto rescan_all; |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | /*-------------------------------------------------------------------------*/ |
| 830 | /* |
| 831 | * Process normal completions (error or success) and clean the schedules. |
| 832 | * |
| 833 | * This is the main path for handing urbs back to drivers. The only other |
| 834 | * normal path is finish_unlinks(), which unlinks URBs using ed_rm_list, |
| 835 | * instead of scanning the (re-reversed) donelist as this does. |
| 836 | */ |
| 837 | |
| 838 | static void ed_unhalt(struct admhcd *ahcd, struct ed *ed, struct urb *urb) |
| 839 | { |
| 840 | struct list_head *entry, *tmp; |
| 841 | __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C); |
| 842 | |
| 843 | #ifdef ADMHC_VERBOSE_DEBUG |
| 844 | admhc_dump_ed(ahcd, "UNHALT", ed, 0); |
| 845 | #endif |
| 846 | /* clear ed halt; this is the td that caused it, but keep it inactive |
| 847 | * until its urb->complete() has a chance to clean up. |
| 848 | */ |
| 849 | ed->hwINFO |= cpu_to_hc32(ahcd, ED_SKIP); |
| 850 | wmb(); |
| 851 | ed->hwHeadP &= ~cpu_to_hc32(ahcd, ED_H); |
| 852 | |
| 853 | list_for_each_safe(entry, tmp, &ed->td_list) { |
| 854 | struct td *td = list_entry(entry, struct td, td_list); |
| 855 | __hc32 info; |
| 856 | |
| 857 | if (td->urb != urb) |
| 858 | break; |
| 859 | |
| 860 | info = td->hwINFO; |
| 861 | info &= ~cpu_to_hc32(ahcd, TD_CC | TD_OWN); |
| 862 | td->hwINFO = info; |
| 863 | |
| 864 | ed->hwHeadP = td->hwNextTD | toggle; |
| 865 | wmb(); |
| 866 | } |
| 867 | |
| 868 | } |
| 869 | |
| 870 | static void ed_intr_refill(struct admhcd *ahcd, struct ed *ed) |
| 871 | { |
| 872 | __hc32 toggle = ed->hwHeadP & cpu_to_hc32(ahcd, ED_C); |
| 873 | |
| 874 | ed->hwHeadP = ed->hwTailP | toggle; |
| 875 | } |
| 876 | |
| 877 | |
| 878 | static inline int is_ed_halted(struct admhcd *ahcd, struct ed *ed) |
| 879 | { |
| 880 | return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & ED_H) == ED_H); |
| 881 | } |
| 882 | |
| 883 | static inline int is_td_halted(struct admhcd *ahcd, struct ed *ed, |
| 884 | struct td *td) |
| 885 | { |
| 886 | return ((hc32_to_cpup(ahcd, &ed->hwHeadP) & TD_MASK) == |
| 887 | (hc32_to_cpup(ahcd, &td->hwNextTD) & TD_MASK)); |
| 888 | } |
| 889 | |
| 890 | static void ed_update(struct admhcd *ahcd, struct ed *ed) |
| 891 | { |
| 892 | struct list_head *entry, *tmp; |
| 893 | |
| 894 | #ifdef ADMHC_VERBOSE_DEBUG |
| 895 | admhc_dump_ed(ahcd, "UPDATE", ed, 1); |
| 896 | #endif |
| 897 | |
| 898 | list_for_each_safe(entry, tmp, &ed->td_list) { |
| 899 | struct td *td = list_entry(entry, struct td, td_list); |
| 900 | struct urb *urb = td->urb; |
| 901 | struct urb_priv *urb_priv = urb->hcpriv; |
| 902 | int status; |
| 903 | |
| 904 | if (hc32_to_cpup(ahcd, &td->hwINFO) & TD_OWN) |
| 905 | break; |
| 906 | |
| 907 | /* update URB's length and status from TD */ |
| 908 | status = td_done(ahcd, urb, td); |
| 909 | if (is_ed_halted(ahcd, ed) && is_td_halted(ahcd, ed, td)) |
| 910 | ed_unhalt(ahcd, ed, urb); |
| 911 | |
| 912 | if (ed->type == PIPE_INTERRUPT) |
| 913 | ed_intr_refill(ahcd, ed); |
| 914 | |
| 915 | /* If all this urb's TDs are done, call complete() */ |
| 916 | if (urb_priv->td_idx == urb_priv->td_cnt) |
| 917 | finish_urb(ahcd, urb, status); |
| 918 | |
| 919 | /* clean schedule: unlink EDs that are no longer busy */ |
| 920 | if (list_empty(&ed->td_list)) { |
| 921 | if (ed->state == ED_OPER) |
| 922 | start_ed_unlink(ahcd, ed); |
| 923 | |
| 924 | /* ... reenabling halted EDs only after fault cleanup */ |
| 925 | } else if ((ed->hwINFO & cpu_to_hc32(ahcd, |
| 926 | ED_SKIP | ED_DEQUEUE)) |
| 927 | == cpu_to_hc32(ahcd, ED_SKIP)) { |
| 928 | td = list_entry(ed->td_list.next, struct td, td_list); |
| 929 | #if 0 |
| 930 | if (!(td->hwINFO & cpu_to_hc32(ahcd, TD_DONE))) { |
| 931 | ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP); |
| 932 | /* ... hc may need waking-up */ |
| 933 | switch (ed->type) { |
| 934 | case PIPE_CONTROL: |
| 935 | admhc_writel(ahcd, OHCI_CLF, |
| 936 | &ahcd->regs->cmdstatus); |
| 937 | break; |
| 938 | case PIPE_BULK: |
| 939 | admhc_writel(ahcd, OHCI_BLF, |
| 940 | &ahcd->regs->cmdstatus); |
| 941 | break; |
| 942 | } |
| 943 | } |
| 944 | #else |
| 945 | if ((td->hwINFO & cpu_to_hc32(ahcd, TD_OWN))) |
| 946 | ed->hwINFO &= ~cpu_to_hc32(ahcd, ED_SKIP); |
| 947 | #endif |
| 948 | } |
| 949 | |
| 950 | } |
| 951 | } |
| 952 | |
| 953 | /* there are some tds completed; called in_irq(), with HCD locked */ |
| 954 | static void admhc_td_complete(struct admhcd *ahcd) |
| 955 | { |
| 956 | struct ed *ed; |
| 957 | |
| 958 | for (ed = ahcd->ed_head; ed; ed = ed->ed_next) { |
| 959 | if (ed->state != ED_OPER) |
| 960 | continue; |
| 961 | |
| 962 | ed_update(ahcd, ed); |
| 963 | } |
| 964 | } |
| 965 | |
