Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * OHCI HCD (Host Controller Driver) for USB. |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
| 5 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * This file is licenced under the GPL. |
| 8 | */ |
| 9 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 10 | #include <linux/irq.h> |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | static void urb_free_priv (struct ohci_hcd *hc, urb_priv_t *urb_priv) |
| 13 | { |
| 14 | int last = urb_priv->length - 1; |
| 15 | |
| 16 | if (last >= 0) { |
| 17 | int i; |
| 18 | struct td *td; |
| 19 | |
| 20 | for (i = 0; i <= last; i++) { |
| 21 | td = urb_priv->td [i]; |
| 22 | if (td) |
| 23 | td_free (hc, td); |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | list_del (&urb_priv->pending); |
| 28 | kfree (urb_priv); |
| 29 | } |
| 30 | |
| 31 | /*-------------------------------------------------------------------------*/ |
| 32 | |
| 33 | /* |
| 34 | * URB goes back to driver, and isn't reissued. |
| 35 | * It's completely gone from HC data structures. |
| 36 | * PRECONDITION: ohci lock held, irqs blocked. |
| 37 | */ |
| 38 | static void |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 39 | finish_urb(struct ohci_hcd *ohci, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | __releases(ohci->lock) |
| 41 | __acquires(ohci->lock) |
| 42 | { |
| 43 | // ASSERT (urb->hcpriv != 0); |
| 44 | |
| 45 | urb_free_priv (ohci, urb->hcpriv); |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 46 | if (likely(status == -EINPROGRESS)) |
| 47 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | switch (usb_pipetype (urb->pipe)) { |
| 50 | case PIPE_ISOCHRONOUS: |
| 51 | ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs--; |
| 52 | break; |
| 53 | case PIPE_INTERRUPT: |
| 54 | ohci_to_hcd(ohci)->self.bandwidth_int_reqs--; |
| 55 | break; |
| 56 | } |
| 57 | |
| 58 | #ifdef OHCI_VERBOSE_DEBUG |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 59 | urb_print(urb, "RET", usb_pipeout (urb->pipe), status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #endif |
| 61 | |
| 62 | /* urb->complete() can reenter this HCD */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 63 | usb_hcd_unlink_urb_from_ep(ohci_to_hcd(ohci), urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | spin_unlock (&ohci->lock); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 65 | usb_hcd_giveback_urb(ohci_to_hcd(ohci), urb, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | spin_lock (&ohci->lock); |
| 67 | |
| 68 | /* stop periodic dma if it's not needed */ |
| 69 | if (ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0 |
| 70 | && ohci_to_hcd(ohci)->self.bandwidth_int_reqs == 0) { |
| 71 | ohci->hc_control &= ~(OHCI_CTRL_PLE|OHCI_CTRL_IE); |
| 72 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | |
| 77 | /*-------------------------------------------------------------------------* |
| 78 | * ED handling functions |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 79 | *-------------------------------------------------------------------------*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /* search for the right schedule branch to use for a periodic ed. |
| 82 | * does some load balancing; returns the branch, or negative errno. |
| 83 | */ |
| 84 | static int balance (struct ohci_hcd *ohci, int interval, int load) |
| 85 | { |
| 86 | int i, branch = -ENOSPC; |
| 87 | |
| 88 | /* iso periods can be huge; iso tds specify frame numbers */ |
| 89 | if (interval > NUM_INTS) |
| 90 | interval = NUM_INTS; |
| 91 | |
| 92 | /* search for the least loaded schedule branch of that period |
| 93 | * that has enough bandwidth left unreserved. |
| 94 | */ |
| 95 | for (i = 0; i < interval ; i++) { |
| 96 | if (branch < 0 || ohci->load [branch] > ohci->load [i]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | int j; |
| 98 | |
| 99 | /* usb 1.1 says 90% of one frame */ |
| 100 | for (j = i; j < NUM_INTS; j += interval) { |
| 101 | if ((ohci->load [j] + load) > 900) |
| 102 | break; |
| 103 | } |
| 104 | if (j < NUM_INTS) |
| 105 | continue; |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 106 | branch = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | } |
| 109 | return branch; |
| 110 | } |
| 111 | |
| 112 | /*-------------------------------------------------------------------------*/ |
| 113 | |
| 114 | /* both iso and interrupt requests have periods; this routine puts them |
| 115 | * into the schedule tree in the apppropriate place. most iso devices use |
| 116 | * 1msec periods, but that's not required. |
| 117 | */ |
| 118 | static void periodic_link (struct ohci_hcd *ohci, struct ed *ed) |
| 119 | { |
| 120 | unsigned i; |
| 121 | |
| 122 | ohci_vdbg (ohci, "link %sed %p branch %d [%dus.], interval %d\n", |
| 123 | (ed->hwINFO & cpu_to_hc32 (ohci, ED_ISO)) ? "iso " : "", |
| 124 | ed, ed->branch, ed->load, ed->interval); |
| 125 | |
| 126 | for (i = ed->branch; i < NUM_INTS; i += ed->interval) { |
| 127 | struct ed **prev = &ohci->periodic [i]; |
| 128 | __hc32 *prev_p = &ohci->hcca->int_table [i]; |
| 129 | struct ed *here = *prev; |
| 130 | |
| 131 | /* sorting each branch by period (slow before fast) |
| 132 | * lets us share the faster parts of the tree. |
| 133 | * (plus maybe: put interrupt eds before iso) |
| 134 | */ |
| 135 | while (here && ed != here) { |
| 136 | if (ed->interval > here->interval) |
| 137 | break; |
| 138 | prev = &here->ed_next; |
| 139 | prev_p = &here->hwNextED; |
| 140 | here = *prev; |
| 141 | } |
| 142 | if (ed != here) { |
| 143 | ed->ed_next = here; |
| 144 | if (here) |
| 145 | ed->hwNextED = *prev_p; |
| 146 | wmb (); |
| 147 | *prev = ed; |
| 148 | *prev_p = cpu_to_hc32(ohci, ed->dma); |
| 149 | wmb(); |
| 150 | } |
| 151 | ohci->load [i] += ed->load; |
| 152 | } |
| 153 | ohci_to_hcd(ohci)->self.bandwidth_allocated += ed->load / ed->interval; |
| 154 | } |
| 155 | |
| 156 | /* link an ed into one of the HC chains */ |
| 157 | |
| 158 | static int ed_schedule (struct ohci_hcd *ohci, struct ed *ed) |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 159 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | int branch; |
| 161 | |
| 162 | if (ohci_to_hcd(ohci)->state == HC_STATE_QUIESCING) |
| 163 | return -EAGAIN; |
| 164 | |
| 165 | ed->state = ED_OPER; |
| 166 | ed->ed_prev = NULL; |
| 167 | ed->ed_next = NULL; |
| 168 | ed->hwNextED = 0; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 169 | if (quirk_zfmicro(ohci) |
| 170 | && (ed->type == PIPE_INTERRUPT) |
| 171 | && !(ohci->eds_scheduled++)) |
Richard Kennedy | 9cebcdc | 2008-03-28 14:50:30 -0700 | [diff] [blame] | 172 | mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | wmb (); |
| 174 | |
| 175 | /* we care about rm_list when setting CLE/BLE in case the HC was at |
| 176 | * work on some TD when CLE/BLE was turned off, and isn't quiesced |
| 177 | * yet. finish_unlinks() restarts as needed, some upcoming INTR_SF. |
| 178 | * |
| 179 | * control and bulk EDs are doubly linked (ed_next, ed_prev), but |
| 180 | * periodic ones are singly linked (ed_next). that's because the |
| 181 | * periodic schedule encodes a tree like figure 3-5 in the ohci |
| 182 | * spec: each qh can have several "previous" nodes, and the tree |
| 183 | * doesn't have unused/idle descriptors. |
| 184 | */ |
| 185 | switch (ed->type) { |
| 186 | case PIPE_CONTROL: |
| 187 | if (ohci->ed_controltail == NULL) { |
| 188 | WARN_ON (ohci->hc_control & OHCI_CTRL_CLE); |
| 189 | ohci_writel (ohci, ed->dma, |
| 190 | &ohci->regs->ed_controlhead); |
| 191 | } else { |
| 192 | ohci->ed_controltail->ed_next = ed; |
| 193 | ohci->ed_controltail->hwNextED = cpu_to_hc32 (ohci, |
| 194 | ed->dma); |
| 195 | } |
| 196 | ed->ed_prev = ohci->ed_controltail; |
| 197 | if (!ohci->ed_controltail && !ohci->ed_rm_list) { |
| 198 | wmb(); |
| 199 | ohci->hc_control |= OHCI_CTRL_CLE; |
| 200 | ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); |
| 201 | ohci_writel (ohci, ohci->hc_control, |
| 202 | &ohci->regs->control); |
| 203 | } |
| 204 | ohci->ed_controltail = ed; |
| 205 | break; |
| 206 | |
| 207 | case PIPE_BULK: |
| 208 | if (ohci->ed_bulktail == NULL) { |
| 209 | WARN_ON (ohci->hc_control & OHCI_CTRL_BLE); |
| 210 | ohci_writel (ohci, ed->dma, &ohci->regs->ed_bulkhead); |
| 211 | } else { |
| 212 | ohci->ed_bulktail->ed_next = ed; |
| 213 | ohci->ed_bulktail->hwNextED = cpu_to_hc32 (ohci, |
| 214 | ed->dma); |
| 215 | } |
| 216 | ed->ed_prev = ohci->ed_bulktail; |
| 217 | if (!ohci->ed_bulktail && !ohci->ed_rm_list) { |
| 218 | wmb(); |
| 219 | ohci->hc_control |= OHCI_CTRL_BLE; |
| 220 | ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); |
| 221 | ohci_writel (ohci, ohci->hc_control, |
| 222 | &ohci->regs->control); |
| 223 | } |
| 224 | ohci->ed_bulktail = ed; |
| 225 | break; |
| 226 | |
| 227 | // case PIPE_INTERRUPT: |
| 228 | // case PIPE_ISOCHRONOUS: |
| 229 | default: |
| 230 | branch = balance (ohci, ed->interval, ed->load); |
| 231 | if (branch < 0) { |
| 232 | ohci_dbg (ohci, |
| 233 | "ERR %d, interval %d msecs, load %d\n", |
| 234 | branch, ed->interval, ed->load); |
| 235 | // FIXME if there are TDs queued, fail them! |
| 236 | return branch; |
| 237 | } |
| 238 | ed->branch = branch; |
| 239 | periodic_link (ohci, ed); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 240 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
| 242 | /* the HC may not see the schedule updates yet, but if it does |
| 243 | * then they'll be properly ordered. |
| 244 | */ |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | /*-------------------------------------------------------------------------*/ |
| 249 | |
| 250 | /* scan the periodic table to find and unlink this ED */ |
| 251 | static void periodic_unlink (struct ohci_hcd *ohci, struct ed *ed) |
| 252 | { |
| 253 | int i; |
| 254 | |
| 255 | for (i = ed->branch; i < NUM_INTS; i += ed->interval) { |
| 256 | struct ed *temp; |
| 257 | struct ed **prev = &ohci->periodic [i]; |
| 258 | __hc32 *prev_p = &ohci->hcca->int_table [i]; |
| 259 | |
| 260 | while (*prev && (temp = *prev) != ed) { |
| 261 | prev_p = &temp->hwNextED; |
| 262 | prev = &temp->ed_next; |
| 263 | } |
| 264 | if (*prev) { |
| 265 | *prev_p = ed->hwNextED; |
| 266 | *prev = ed->ed_next; |
| 267 | } |
| 268 | ohci->load [i] -= ed->load; |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | ohci_to_hcd(ohci)->self.bandwidth_allocated -= ed->load / ed->interval; |
| 271 | |
| 272 | ohci_vdbg (ohci, "unlink %sed %p branch %d [%dus.], interval %d\n", |
| 273 | (ed->hwINFO & cpu_to_hc32 (ohci, ED_ISO)) ? "iso " : "", |
| 274 | ed, ed->branch, ed->load, ed->interval); |
| 275 | } |
| 276 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 277 | /* unlink an ed from one of the HC chains. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | * just the link to the ed is unlinked. |
| 279 | * the link from the ed still points to another operational ed or 0 |
| 280 | * so the HC can eventually finish the processing of the unlinked ed |
| 281 | * (assuming it already started that, which needn't be true). |
| 282 | * |
| 283 | * ED_UNLINK is a transient state: the HC may still see this ED, but soon |
| 284 | * it won't. ED_SKIP means the HC will finish its current transaction, |
| 285 | * but won't start anything new. The TD queue may still grow; device |
| 286 | * drivers don't know about this HCD-internal state. |
| 287 | * |
| 288 | * When the HC can't see the ED, something changes ED_UNLINK to one of: |
| 289 | * |
| 290 | * - ED_OPER: when there's any request queued, the ED gets rescheduled |
| 291 | * immediately. HC should be working on them. |
| 292 | * |
| 293 | * - ED_IDLE: when there's no TD queue. there's no reason for the HC |
| 294 | * to care about this ED; safe to disable the endpoint. |
| 295 | * |
| 296 | * When finish_unlinks() runs later, after SOF interrupt, it will often |
| 297 | * complete one or more URB unlinks before making that state change. |
| 298 | */ |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 299 | static void ed_deschedule (struct ohci_hcd *ohci, struct ed *ed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | { |
| 301 | ed->hwINFO |= cpu_to_hc32 (ohci, ED_SKIP); |
| 302 | wmb (); |
| 303 | ed->state = ED_UNLINK; |
| 304 | |
| 305 | /* To deschedule something from the control or bulk list, just |
| 306 | * clear CLE/BLE and wait. There's no safe way to scrub out list |
| 307 | * head/current registers until later, and "later" isn't very |
| 308 | * tightly specified. Figure 6-5 and Section 6.4.2.2 show how |
| 309 | * the HC is reading the ED queues (while we modify them). |
| 310 | * |
| 311 | * For now, ed_schedule() is "later". It might be good paranoia |
| 312 | * to scrub those registers in finish_unlinks(), in case of bugs |
| 313 | * that make the HC try to use them. |
| 314 | */ |
| 315 | switch (ed->type) { |
| 316 | case PIPE_CONTROL: |
| 317 | /* remove ED from the HC's list: */ |
| 318 | if (ed->ed_prev == NULL) { |
| 319 | if (!ed->hwNextED) { |
| 320 | ohci->hc_control &= ~OHCI_CTRL_CLE; |
| 321 | ohci_writel (ohci, ohci->hc_control, |
| 322 | &ohci->regs->control); |
| 323 | // a ohci_readl() later syncs CLE with the HC |
| 324 | } else |
| 325 | ohci_writel (ohci, |
| 326 | hc32_to_cpup (ohci, &ed->hwNextED), |
| 327 | &ohci->regs->ed_controlhead); |
| 328 | } else { |
| 329 | ed->ed_prev->ed_next = ed->ed_next; |
| 330 | ed->ed_prev->hwNextED = ed->hwNextED; |
| 331 | } |
| 332 | /* remove ED from the HCD's list: */ |
| 333 | if (ohci->ed_controltail == ed) { |
| 334 | ohci->ed_controltail = ed->ed_prev; |
| 335 | if (ohci->ed_controltail) |
| 336 | ohci->ed_controltail->ed_next = NULL; |
| 337 | } else if (ed->ed_next) { |
| 338 | ed->ed_next->ed_prev = ed->ed_prev; |
| 339 | } |
| 340 | break; |
| 341 | |
| 342 | case PIPE_BULK: |
| 343 | /* remove ED from the HC's list: */ |
| 344 | if (ed->ed_prev == NULL) { |
| 345 | if (!ed->hwNextED) { |
| 346 | ohci->hc_control &= ~OHCI_CTRL_BLE; |
| 347 | ohci_writel (ohci, ohci->hc_control, |
| 348 | &ohci->regs->control); |
| 349 | // a ohci_readl() later syncs BLE with the HC |
| 350 | } else |
| 351 | ohci_writel (ohci, |
| 352 | hc32_to_cpup (ohci, &ed->hwNextED), |
| 353 | &ohci->regs->ed_bulkhead); |
| 354 | } else { |
| 355 | ed->ed_prev->ed_next = ed->ed_next; |
| 356 | ed->ed_prev->hwNextED = ed->hwNextED; |
| 357 | } |
| 358 | /* remove ED from the HCD's list: */ |
| 359 | if (ohci->ed_bulktail == ed) { |
| 360 | ohci->ed_bulktail = ed->ed_prev; |
| 361 | if (ohci->ed_bulktail) |
| 362 | ohci->ed_bulktail->ed_next = NULL; |
| 363 | } else if (ed->ed_next) { |
| 364 | ed->ed_next->ed_prev = ed->ed_prev; |
| 365 | } |
| 366 | break; |
| 367 | |
| 368 | // case PIPE_INTERRUPT: |
| 369 | // case PIPE_ISOCHRONOUS: |
| 370 | default: |
| 371 | periodic_unlink (ohci, ed); |
| 372 | break; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | |
| 377 | /*-------------------------------------------------------------------------*/ |
| 378 | |
| 379 | /* get and maybe (re)init an endpoint. init _should_ be done only as part |
| 380 | * of enumeration, usb_set_configuration() or usb_set_interface(). |
| 381 | */ |
| 382 | static struct ed *ed_get ( |
| 383 | struct ohci_hcd *ohci, |
| 384 | struct usb_host_endpoint *ep, |
| 385 | struct usb_device *udev, |
| 386 | unsigned int pipe, |
| 387 | int interval |
| 388 | ) { |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 389 | struct ed *ed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | unsigned long flags; |
| 391 | |
| 392 | spin_lock_irqsave (&ohci->lock, flags); |
| 393 | |
| 394 | if (!(ed = ep->hcpriv)) { |
| 395 | struct td *td; |
| 396 | int is_out; |
| 397 | u32 info; |
| 398 | |
| 399 | ed = ed_alloc (ohci, GFP_ATOMIC); |
| 400 | if (!ed) { |
| 401 | /* out of memory */ |
| 402 | goto done; |
| 403 | } |
| 404 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 405 | /* dummy td; end of td list for ed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | td = td_alloc (ohci, GFP_ATOMIC); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 407 | if (!td) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | /* out of memory */ |
| 409 | ed_free (ohci, ed); |
| 410 | ed = NULL; |
| 411 | goto done; |
| 412 | } |
| 413 | ed->dummy = td; |
| 414 | ed->hwTailP = cpu_to_hc32 (ohci, td->td_dma); |
| 415 | ed->hwHeadP = ed->hwTailP; /* ED_C, ED_H zeroed */ |
| 416 | ed->state = ED_IDLE; |
| 417 | |
| 418 | is_out = !(ep->desc.bEndpointAddress & USB_DIR_IN); |
| 419 | |
| 420 | /* FIXME usbcore changes dev->devnum before SET_ADDRESS |
| 421 | * suceeds ... otherwise we wouldn't need "pipe". |
| 422 | */ |
| 423 | info = usb_pipedevice (pipe); |
| 424 | ed->type = usb_pipetype(pipe); |
| 425 | |
| 426 | info |= (ep->desc.bEndpointAddress & ~USB_DIR_IN) << 7; |
| 427 | info |= le16_to_cpu(ep->desc.wMaxPacketSize) << 16; |
| 428 | if (udev->speed == USB_SPEED_LOW) |
| 429 | info |= ED_LOWSPEED; |
| 430 | /* only control transfers store pids in tds */ |
| 431 | if (ed->type != PIPE_CONTROL) { |
| 432 | info |= is_out ? ED_OUT : ED_IN; |
| 433 | if (ed->type != PIPE_BULK) { |
| 434 | /* periodic transfers... */ |
| 435 | if (ed->type == PIPE_ISOCHRONOUS) |
| 436 | info |= ED_ISO; |
| 437 | else if (interval > 32) /* iso can be bigger */ |
| 438 | interval = 32; |
| 439 | ed->interval = interval; |
| 440 | ed->load = usb_calc_bus_time ( |
| 441 | udev->speed, !is_out, |
| 442 | ed->type == PIPE_ISOCHRONOUS, |
| 443 | le16_to_cpu(ep->desc.wMaxPacketSize)) |
| 444 | / 1000; |
| 445 | } |
| 446 | } |
| 447 | ed->hwINFO = cpu_to_hc32(ohci, info); |
| 448 | |
| 449 | ep->hcpriv = ed; |
| 450 | } |
| 451 | |
| 452 | done: |
| 453 | spin_unlock_irqrestore (&ohci->lock, flags); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 454 | return ed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | /*-------------------------------------------------------------------------*/ |
| 458 | |
| 459 | /* request unlinking of an endpoint from an operational HC. |
| 460 | * put the ep on the rm_list |
| 461 | * real work is done at the next start frame (SF) hardware interrupt |
| 462 | * caller guarantees HCD is running, so hardware access is safe, |
| 463 | * and that ed->state is ED_OPER |
| 464 | */ |
| 465 | static void start_ed_unlink (struct ohci_hcd *ohci, struct ed *ed) |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 466 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | ed->hwINFO |= cpu_to_hc32 (ohci, ED_DEQUEUE); |
| 468 | ed_deschedule (ohci, ed); |
| 469 | |
| 470 | /* rm_list is just singly linked, for simplicity */ |
| 471 | ed->ed_next = ohci->ed_rm_list; |
| 472 | ed->ed_prev = NULL; |
| 473 | ohci->ed_rm_list = ed; |
| 474 | |
| 475 | /* enable SOF interrupt */ |
| 476 | ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); |
| 477 | ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); |
| 478 | // flush those writes, and get latest HCCA contents |
| 479 | (void) ohci_readl (ohci, &ohci->regs->control); |
| 480 | |
| 481 | /* SF interrupt might get delayed; record the frame counter value that |
| 482 | * indicates when the HC isn't looking at it, so concurrent unlinks |
| 483 | * behave. frame_no wraps every 2^16 msec, and changes right before |
| 484 | * SF is triggered. |
| 485 | */ |
| 486 | ed->tick = ohci_frame_no(ohci) + 1; |
| 487 | |
| 488 | } |
| 489 | |
| 490 | /*-------------------------------------------------------------------------* |
| 491 | * TD handling functions |
| 492 | *-------------------------------------------------------------------------*/ |
| 493 | |
| 494 | /* enqueue next TD for this URB (OHCI spec 5.2.8.2) */ |
| 495 | |
| 496 | static void |
| 497 | td_fill (struct ohci_hcd *ohci, u32 info, |
| 498 | dma_addr_t data, int len, |
| 499 | struct urb *urb, int index) |
| 500 | { |
| 501 | struct td *td, *td_pt; |
| 502 | struct urb_priv *urb_priv = urb->hcpriv; |
| 503 | int is_iso = info & TD_ISO; |
| 504 | int hash; |
| 505 | |
| 506 | // ASSERT (index < urb_priv->length); |
| 507 | |
| 508 | /* aim for only one interrupt per urb. mostly applies to control |
| 509 | * and iso; other urbs rarely need more than one TD per urb. |
| 510 | * this way, only final tds (or ones with an error) cause IRQs. |
| 511 | * at least immediately; use DI=6 in case any control request is |
| 512 | * tempted to die part way through. (and to force the hc to flush |
| 513 | * its donelist soonish, even on unlink paths.) |
| 514 | * |
| 515 | * NOTE: could delay interrupts even for the last TD, and get fewer |
| 516 | * interrupts ... increasing per-urb latency by sharing interrupts. |
| 517 | * Drivers that queue bulk urbs may request that behavior. |
| 518 | */ |
| 519 | if (index != (urb_priv->length - 1) |
| 520 | || (urb->transfer_flags & URB_NO_INTERRUPT)) |
| 521 | info |= TD_DI_SET (6); |
| 522 | |
| 523 | /* use this td as the next dummy */ |
| 524 | td_pt = urb_priv->td [index]; |
| 525 | |
| 526 | /* fill the old dummy TD */ |
| 527 | td = urb_priv->td [index] = urb_priv->ed->dummy; |
| 528 | urb_priv->ed->dummy = td_pt; |
| 529 | |
| 530 | td->ed = urb_priv->ed; |
| 531 | td->next_dl_td = NULL; |
| 532 | td->index = index; |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 533 | td->urb = urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | td->data_dma = data; |
| 535 | if (!len) |
| 536 | data = 0; |
| 537 | |
| 538 | td->hwINFO = cpu_to_hc32 (ohci, info); |
| 539 | if (is_iso) { |
| 540 | td->hwCBP = cpu_to_hc32 (ohci, data & 0xFFFFF000); |
| 541 | *ohci_hwPSWp(ohci, td, 0) = cpu_to_hc16 (ohci, |
| 542 | (data & 0x0FFF) | 0xE000); |
| 543 | td->ed->last_iso = info & 0xffff; |
| 544 | } else { |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 545 | td->hwCBP = cpu_to_hc32 (ohci, data); |
| 546 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | if (data) |
| 548 | td->hwBE = cpu_to_hc32 (ohci, data + len - 1); |
| 549 | else |
| 550 | td->hwBE = 0; |
| 551 | td->hwNextTD = cpu_to_hc32 (ohci, td_pt->td_dma); |
| 552 | |
| 553 | /* append to queue */ |
| 554 | list_add_tail (&td->td_list, &td->ed->td_list); |
| 555 | |
| 556 | /* hash it for later reverse mapping */ |
| 557 | hash = TD_HASH_FUNC (td->td_dma); |
| 558 | td->td_hash = ohci->td_hash [hash]; |
| 559 | ohci->td_hash [hash] = td; |
| 560 | |
| 561 | /* HC might read the TD (or cachelines) right away ... */ |
| 562 | wmb (); |
| 563 | td->ed->hwTailP = td->hwNextTD; |
| 564 | } |
| 565 | |
| 566 | /*-------------------------------------------------------------------------*/ |
| 567 | |
| 568 | /* Prepare all TDs of a transfer, and queue them onto the ED. |
| 569 | * Caller guarantees HC is active. |
| 570 | * Usually the ED is already on the schedule, so TDs might be |
| 571 | * processed as soon as they're queued. |
| 572 | */ |
| 573 | static void td_submit_urb ( |
| 574 | struct ohci_hcd *ohci, |
| 575 | struct urb *urb |
| 576 | ) { |
| 577 | struct urb_priv *urb_priv = urb->hcpriv; |
| 578 | dma_addr_t data; |
| 579 | int data_len = urb->transfer_buffer_length; |
| 580 | int cnt = 0; |
| 581 | u32 info = 0; |
| 582 | int is_out = usb_pipeout (urb->pipe); |
| 583 | int periodic = 0; |
| 584 | |
| 585 | /* OHCI handles the bulk/interrupt data toggles itself. We just |
| 586 | * use the device toggle bits for resetting, and rely on the fact |
| 587 | * that resetting toggle is meaningless if the endpoint is active. |
| 588 | */ |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 589 | if (!usb_gettoggle (urb->dev, usb_pipeendpoint (urb->pipe), is_out)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), |
| 591 | is_out, 1); |
| 592 | urb_priv->ed->hwHeadP &= ~cpu_to_hc32 (ohci, ED_C); |
| 593 | } |
| 594 | |
| 595 | urb_priv->td_cnt = 0; |
| 596 | list_add (&urb_priv->pending, &ohci->pending); |
| 597 | |
| 598 | if (data_len) |
| 599 | data = urb->transfer_dma; |
| 600 | else |
| 601 | data = 0; |
| 602 | |
| 603 | /* NOTE: TD_CC is set so we can tell which TDs the HC processed by |
| 604 | * using TD_CC_GET, as well as by seeing them on the done list. |
| 605 | * (CC = NotAccessed ... 0x0F, or 0x0E in PSWs for ISO.) |
| 606 | */ |
| 607 | switch (urb_priv->ed->type) { |
| 608 | |
| 609 | /* Bulk and interrupt are identical except for where in the schedule |
| 610 | * their EDs live. |
| 611 | */ |
| 612 | case PIPE_INTERRUPT: |
| 613 | /* ... and periodic urbs have extra accounting */ |
| 614 | periodic = ohci_to_hcd(ohci)->self.bandwidth_int_reqs++ == 0 |
| 615 | && ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs == 0; |
| 616 | /* FALLTHROUGH */ |
| 617 | case PIPE_BULK: |
| 618 | info = is_out |
| 619 | ? TD_T_TOGGLE | TD_CC | TD_DP_OUT |
| 620 | : TD_T_TOGGLE | TD_CC | TD_DP_IN; |
| 621 | /* TDs _could_ transfer up to 8K each */ |
| 622 | while (data_len > 4096) { |
| 623 | td_fill (ohci, info, data, 4096, urb, cnt); |
| 624 | data += 4096; |
| 625 | data_len -= 4096; |
| 626 | cnt++; |
| 627 | } |
| 628 | /* maybe avoid ED halt on final TD short read */ |
| 629 | if (!(urb->transfer_flags & URB_SHORT_NOT_OK)) |
| 630 | info |= TD_R; |
| 631 | td_fill (ohci, info, data, data_len, urb, cnt); |
| 632 | cnt++; |
| 633 | if ((urb->transfer_flags & URB_ZERO_PACKET) |
| 634 | && cnt < urb_priv->length) { |
| 635 | td_fill (ohci, info, 0, 0, urb, cnt); |
| 636 | cnt++; |
| 637 | } |
| 638 | /* maybe kickstart bulk list */ |
| 639 | if (urb_priv->ed->type == PIPE_BULK) { |
| 640 | wmb (); |
| 641 | ohci_writel (ohci, OHCI_BLF, &ohci->regs->cmdstatus); |
| 642 | } |
| 643 | break; |
| 644 | |
| 645 | /* control manages DATA0/DATA1 toggle per-request; SETUP resets it, |
| 646 | * any DATA phase works normally, and the STATUS ack is special. |
| 647 | */ |
| 648 | case PIPE_CONTROL: |
| 649 | info = TD_CC | TD_DP_SETUP | TD_T_DATA0; |
| 650 | td_fill (ohci, info, urb->setup_dma, 8, urb, cnt++); |
| 651 | if (data_len > 0) { |
| 652 | info = TD_CC | TD_R | TD_T_DATA1; |
| 653 | info |= is_out ? TD_DP_OUT : TD_DP_IN; |
| 654 | /* NOTE: mishandles transfers >8K, some >4K */ |
| 655 | td_fill (ohci, info, data, data_len, urb, cnt++); |
| 656 | } |
| 657 | info = (is_out || data_len == 0) |
| 658 | ? TD_CC | TD_DP_IN | TD_T_DATA1 |
| 659 | : TD_CC | TD_DP_OUT | TD_T_DATA1; |
| 660 | td_fill (ohci, info, data, 0, urb, cnt++); |
| 661 | /* maybe kickstart control list */ |
| 662 | wmb (); |
| 663 | ohci_writel (ohci, OHCI_CLF, &ohci->regs->cmdstatus); |
| 664 | break; |
| 665 | |
| 666 | /* ISO has no retransmit, so no toggle; and it uses special TDs. |
| 667 | * Each TD could handle multiple consecutive frames (interval 1); |
| 668 | * we could often reduce the number of TDs here. |
| 669 | */ |
| 670 | case PIPE_ISOCHRONOUS: |
| 671 | for (cnt = 0; cnt < urb->number_of_packets; cnt++) { |
| 672 | int frame = urb->start_frame; |
| 673 | |
| 674 | // FIXME scheduling should handle frame counter |
| 675 | // roll-around ... exotic case (and OHCI has |
| 676 | // a 2^16 iso range, vs other HCs max of 2^10) |
| 677 | frame += cnt * urb->interval; |
| 678 | frame &= 0xffff; |
| 679 | td_fill (ohci, TD_CC | TD_ISO | frame, |
| 680 | data + urb->iso_frame_desc [cnt].offset, |
| 681 | urb->iso_frame_desc [cnt].length, urb, cnt); |
| 682 | } |
| 683 | periodic = ohci_to_hcd(ohci)->self.bandwidth_isoc_reqs++ == 0 |
| 684 | && ohci_to_hcd(ohci)->self.bandwidth_int_reqs == 0; |
| 685 | break; |
| 686 | } |
| 687 | |
| 688 | /* start periodic dma if needed */ |
| 689 | if (periodic) { |
| 690 | wmb (); |
| 691 | ohci->hc_control |= OHCI_CTRL_PLE|OHCI_CTRL_IE; |
| 692 | ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
| 693 | } |
| 694 | |
| 695 | // ASSERT (urb_priv->length == cnt); |
| 696 | } |
| 697 | |
| 698 | /*-------------------------------------------------------------------------* |
| 699 | * Done List handling functions |
| 700 | *-------------------------------------------------------------------------*/ |
| 701 | |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 702 | /* calculate transfer length/status and update the urb */ |
| 703 | static int td_done(struct ohci_hcd *ohci, struct urb *urb, struct td *td) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | u32 tdINFO = hc32_to_cpup (ohci, &td->hwINFO); |
| 706 | int cc = 0; |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 707 | int status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | list_del (&td->td_list); |
| 710 | |
| 711 | /* ISO ... drivers see per-TD length/status */ |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 712 | if (tdINFO & TD_ISO) { |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 713 | u16 tdPSW = ohci_hwPSW(ohci, td, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | int dlen = 0; |
| 715 | |
| 716 | /* NOTE: assumes FC in tdINFO == 0, and that |
| 717 | * only the first of 0..MAXPSW psws is used. |
| 718 | */ |
| 719 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 720 | cc = (tdPSW >> 12) & 0xF; |
| 721 | if (tdINFO & TD_CC) /* hc didn't touch? */ |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 722 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | if (usb_pipeout (urb->pipe)) |
| 725 | dlen = urb->iso_frame_desc [td->index].length; |
| 726 | else { |
| 727 | /* short reads are always OK for ISO */ |
| 728 | if (cc == TD_DATAUNDERRUN) |
| 729 | cc = TD_CC_NOERROR; |
| 730 | dlen = tdPSW & 0x3ff; |
| 731 | } |
| 732 | urb->actual_length += dlen; |
| 733 | urb->iso_frame_desc [td->index].actual_length = dlen; |
| 734 | urb->iso_frame_desc [td->index].status = cc_to_error [cc]; |
| 735 | |
| 736 | if (cc != TD_CC_NOERROR) |
| 737 | ohci_vdbg (ohci, |
| 738 | "urb %p iso td %p (%d) len %d cc %d\n", |
| 739 | urb, td, 1 + td->index, dlen, cc); |
| 740 | |
| 741 | /* BULK, INT, CONTROL ... drivers see aggregate length/status, |
| 742 | * except that "setup" bytes aren't counted and "short" transfers |
| 743 | * might not be reported as errors. |
| 744 | */ |
| 745 | } else { |
| 746 | int type = usb_pipetype (urb->pipe); |
| 747 | u32 tdBE = hc32_to_cpup (ohci, &td->hwBE); |
| 748 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 749 | cc = TD_CC_GET (tdINFO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
| 751 | /* update packet status if needed (short is normally ok) */ |
| 752 | if (cc == TD_DATAUNDERRUN |
| 753 | && !(urb->transfer_flags & URB_SHORT_NOT_OK)) |
| 754 | cc = TD_CC_NOERROR; |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 755 | if (cc != TD_CC_NOERROR && cc < 0x0E) |
| 756 | status = cc_to_error[cc]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | /* count all non-empty packets except control SETUP packet */ |
| 759 | if ((type != PIPE_CONTROL || td->index != 0) && tdBE != 0) { |
| 760 | if (td->hwCBP == 0) |
| 761 | urb->actual_length += tdBE - td->data_dma + 1; |
| 762 | else |
| 763 | urb->actual_length += |
| 764 | hc32_to_cpup (ohci, &td->hwCBP) |
| 765 | - td->data_dma; |
| 766 | } |
| 767 | |
| 768 | if (cc != TD_CC_NOERROR && cc < 0x0E) |
| 769 | ohci_vdbg (ohci, |
| 770 | "urb %p td %p (%d) cc %d, len=%d/%d\n", |
| 771 | urb, td, 1 + td->index, cc, |
| 772 | urb->actual_length, |
| 773 | urb->transfer_buffer_length); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 774 | } |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 775 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | /*-------------------------------------------------------------------------*/ |
| 779 | |
Alan Stern | 6e8fe43 | 2007-08-22 13:08:40 -0400 | [diff] [blame] | 780 | static void ed_halted(struct ohci_hcd *ohci, struct td *td, int cc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | { |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 782 | struct urb *urb = td->urb; |
Alan Stern | 6e8fe43 | 2007-08-22 13:08:40 -0400 | [diff] [blame] | 783 | urb_priv_t *urb_priv = urb->hcpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | struct ed *ed = td->ed; |
| 785 | struct list_head *tmp = td->td_list.next; |
| 786 | __hc32 toggle = ed->hwHeadP & cpu_to_hc32 (ohci, ED_C); |
| 787 | |
| 788 | /* clear ed halt; this is the td that caused it, but keep it inactive |
| 789 | * until its urb->complete() has a chance to clean up. |
| 790 | */ |
| 791 | ed->hwINFO |= cpu_to_hc32 (ohci, ED_SKIP); |
| 792 | wmb (); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 793 | ed->hwHeadP &= ~cpu_to_hc32 (ohci, ED_H); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Alan Stern | 6e8fe43 | 2007-08-22 13:08:40 -0400 | [diff] [blame] | 795 | /* Get rid of all later tds from this urb. We don't have |
| 796 | * to be careful: no errors and nothing was transferred. |
| 797 | * Also patch the ed so it looks as if those tds completed normally. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | */ |
| 799 | while (tmp != &ed->td_list) { |
| 800 | struct td *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | next = list_entry (tmp, struct td, td_list); |
| 803 | tmp = next->td_list.next; |
| 804 | |
| 805 | if (next->urb != urb) |
| 806 | break; |
| 807 | |
| 808 | /* NOTE: if multi-td control DATA segments get supported, |
| 809 | * this urb had one of them, this td wasn't the last td |
| 810 | * in that segment (TD_R clear), this ed halted because |
| 811 | * of a short read, _and_ URB_SHORT_NOT_OK is clear ... |
| 812 | * then we need to leave the control STATUS packet queued |
| 813 | * and clear ED_SKIP. |
| 814 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Alan Stern | 6e8fe43 | 2007-08-22 13:08:40 -0400 | [diff] [blame] | 816 | list_del(&next->td_list); |
| 817 | urb_priv->td_cnt++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | ed->hwHeadP = next->hwNextTD | toggle; |
| 819 | } |
| 820 | |
| 821 | /* help for troubleshooting: report anything that |
| 822 | * looks odd ... that doesn't include protocol stalls |
| 823 | * (or maybe some other things) |
| 824 | */ |
| 825 | switch (cc) { |
| 826 | case TD_DATAUNDERRUN: |
| 827 | if ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0) |
| 828 | break; |
| 829 | /* fallthrough */ |
| 830 | case TD_CC_STALL: |
| 831 | if (usb_pipecontrol (urb->pipe)) |
| 832 | break; |
| 833 | /* fallthrough */ |
| 834 | default: |
| 835 | ohci_dbg (ohci, |
| 836 | "urb %p path %s ep%d%s %08x cc %d --> status %d\n", |
| 837 | urb, urb->dev->devpath, |
| 838 | usb_pipeendpoint (urb->pipe), |
| 839 | usb_pipein (urb->pipe) ? "in" : "out", |
| 840 | hc32_to_cpu (ohci, td->hwINFO), |
| 841 | cc, cc_to_error [cc]); |
| 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | } |
| 844 | |
| 845 | /* replies to the request have to be on a FIFO basis so |
| 846 | * we unreverse the hc-reversed done-list |
| 847 | */ |
| 848 | static struct td *dl_reverse_done_list (struct ohci_hcd *ohci) |
| 849 | { |
| 850 | u32 td_dma; |
| 851 | struct td *td_rev = NULL; |
| 852 | struct td *td = NULL; |
| 853 | |
| 854 | td_dma = hc32_to_cpup (ohci, &ohci->hcca->done_head); |
| 855 | ohci->hcca->done_head = 0; |
| 856 | wmb(); |
| 857 | |
| 858 | /* get TD from hc's singly linked list, and |
| 859 | * prepend to ours. ed->td_list changes later. |
| 860 | */ |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 861 | while (td_dma) { |
| 862 | int cc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | td = dma_to_td (ohci, td_dma); |
| 865 | if (!td) { |
| 866 | ohci_err (ohci, "bad entry %8x\n", td_dma); |
| 867 | break; |
| 868 | } |
| 869 | |
| 870 | td->hwINFO |= cpu_to_hc32 (ohci, TD_DONE); |
| 871 | cc = TD_CC_GET (hc32_to_cpup (ohci, &td->hwINFO)); |
| 872 | |
| 873 | /* Non-iso endpoints can halt on error; un-halt, |
| 874 | * and dequeue any other TDs from this urb. |
| 875 | * No other TD could have caused the halt. |
| 876 | */ |
| 877 | if (cc != TD_CC_NOERROR |
| 878 | && (td->ed->hwHeadP & cpu_to_hc32 (ohci, ED_H))) |
Alan Stern | 6e8fe43 | 2007-08-22 13:08:40 -0400 | [diff] [blame] | 879 | ed_halted(ohci, td, cc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 881 | td->next_dl_td = td_rev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | td_rev = td; |
| 883 | td_dma = hc32_to_cpup (ohci, &td->hwNextTD); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | return td_rev; |
| 886 | } |
| 887 | |
| 888 | /*-------------------------------------------------------------------------*/ |
| 889 | |
| 890 | /* there are some urbs/eds to unlink; called in_irq(), with HCD locked */ |
| 891 | static void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 892 | finish_unlinks (struct ohci_hcd *ohci, u16 tick) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | { |
| 894 | struct ed *ed, **last; |
| 895 | |
| 896 | rescan_all: |
| 897 | for (last = &ohci->ed_rm_list, ed = *last; ed != NULL; ed = *last) { |
| 898 | struct list_head *entry, *tmp; |
| 899 | int completed, modified; |
| 900 | __hc32 *prev; |
| 901 | |
| 902 | /* only take off EDs that the HC isn't using, accounting for |
| 903 | * frame counter wraps and EDs with partially retired TDs |
| 904 | */ |
David Brownell | da66b71 | 2006-10-06 00:43:51 -0700 | [diff] [blame] | 905 | if (likely (HC_IS_RUNNING(ohci_to_hcd(ohci)->state))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | if (tick_before (tick, ed->tick)) { |
| 907 | skip_ed: |
| 908 | last = &ed->ed_next; |
| 909 | continue; |
| 910 | } |
| 911 | |
| 912 | if (!list_empty (&ed->td_list)) { |
| 913 | struct td *td; |
| 914 | u32 head; |
| 915 | |
| 916 | td = list_entry (ed->td_list.next, struct td, |
| 917 | td_list); |
| 918 | head = hc32_to_cpu (ohci, ed->hwHeadP) & |
| 919 | TD_MASK; |
| 920 | |
| 921 | /* INTR_WDH may need to clean up first */ |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 922 | if (td->td_dma != head) { |
| 923 | if (ed == ohci->ed_to_check) |
| 924 | ohci->ed_to_check = NULL; |
| 925 | else |
| 926 | goto skip_ed; |
| 927 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | } |
| 930 | |
| 931 | /* reentrancy: if we drop the schedule lock, someone might |
| 932 | * have modified this list. normally it's just prepending |
| 933 | * entries (which we'd ignore), but paranoia won't hurt. |
| 934 | */ |
| 935 | *last = ed->ed_next; |
| 936 | ed->ed_next = NULL; |
| 937 | modified = 0; |
| 938 | |
| 939 | /* unlink urbs as requested, but rescan the list after |
| 940 | * we call a completion since it might have unlinked |
| 941 | * another (earlier) urb |
| 942 | * |
| 943 | * When we get here, the HC doesn't see this ed. But it |
| 944 | * must not be rescheduled until all completed URBs have |
| 945 | * been given back to the driver. |
| 946 | */ |
| 947 | rescan_this: |
| 948 | completed = 0; |
| 949 | prev = &ed->hwHeadP; |
| 950 | list_for_each_safe (entry, tmp, &ed->td_list) { |
| 951 | struct td *td; |
| 952 | struct urb *urb; |
| 953 | urb_priv_t *urb_priv; |
| 954 | __hc32 savebits; |
| 955 | |
| 956 | td = list_entry (entry, struct td, td_list); |
| 957 | urb = td->urb; |
| 958 | urb_priv = td->urb->hcpriv; |
| 959 | |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 960 | if (!urb->unlinked) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | prev = &td->hwNextTD; |
| 962 | continue; |
| 963 | } |
| 964 | |
| 965 | /* patch pointer hc uses */ |
| 966 | savebits = *prev & ~cpu_to_hc32 (ohci, TD_MASK); |
| 967 | *prev = td->hwNextTD | savebits; |
| 968 | |
| 969 | /* HC may have partly processed this TD */ |
| 970 | td_done (ohci, urb, td); |
| 971 | urb_priv->td_cnt++; |
| 972 | |
| 973 | /* if URB is done, clean up */ |
| 974 | if (urb_priv->td_cnt == urb_priv->length) { |
| 975 | modified = completed = 1; |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 976 | finish_urb(ohci, urb, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | } |
| 978 | } |
| 979 | if (completed && !list_empty (&ed->td_list)) |
| 980 | goto rescan_this; |
| 981 | |
| 982 | /* ED's now officially unlinked, hc doesn't see */ |
| 983 | ed->state = ED_IDLE; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 984 | if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT) |
| 985 | ohci->eds_scheduled--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | ed->hwHeadP &= ~cpu_to_hc32(ohci, ED_H); |
| 987 | ed->hwNextED = 0; |
| 988 | wmb (); |
| 989 | ed->hwINFO &= ~cpu_to_hc32 (ohci, ED_SKIP | ED_DEQUEUE); |
| 990 | |
| 991 | /* but if there's work queued, reschedule */ |
| 992 | if (!list_empty (&ed->td_list)) { |
| 993 | if (HC_IS_RUNNING(ohci_to_hcd(ohci)->state)) |
| 994 | ed_schedule (ohci, ed); |
| 995 | } |
| 996 | |
| 997 | if (modified) |
| 998 | goto rescan_all; |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1001 | /* maybe reenable control and bulk lists */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | if (HC_IS_RUNNING(ohci_to_hcd(ohci)->state) |
| 1003 | && ohci_to_hcd(ohci)->state != HC_STATE_QUIESCING |
| 1004 | && !ohci->ed_rm_list) { |
| 1005 | u32 command = 0, control = 0; |
| 1006 | |
| 1007 | if (ohci->ed_controltail) { |
| 1008 | command |= OHCI_CLF; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1009 | if (quirk_zfmicro(ohci)) |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1010 | mdelay(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | if (!(ohci->hc_control & OHCI_CTRL_CLE)) { |
| 1012 | control |= OHCI_CTRL_CLE; |
| 1013 | ohci_writel (ohci, 0, |
| 1014 | &ohci->regs->ed_controlcurrent); |
| 1015 | } |
| 1016 | } |
| 1017 | if (ohci->ed_bulktail) { |
| 1018 | command |= OHCI_BLF; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1019 | if (quirk_zfmicro(ohci)) |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1020 | mdelay(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | if (!(ohci->hc_control & OHCI_CTRL_BLE)) { |
| 1022 | control |= OHCI_CTRL_BLE; |
| 1023 | ohci_writel (ohci, 0, |
| 1024 | &ohci->regs->ed_bulkcurrent); |
| 1025 | } |
| 1026 | } |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | /* CLE/BLE to enable, CLF/BLF to (maybe) kickstart */ |
| 1029 | if (control) { |
| 1030 | ohci->hc_control |= control; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1031 | if (quirk_zfmicro(ohci)) |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1032 | mdelay(1); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1033 | ohci_writel (ohci, ohci->hc_control, |
| 1034 | &ohci->regs->control); |
| 1035 | } |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1036 | if (command) { |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1037 | if (quirk_zfmicro(ohci)) |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1038 | mdelay(1); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1039 | ohci_writel (ohci, command, &ohci->regs->cmdstatus); |
| 1040 | } |
David Brownell | 0e498763 | 2005-04-18 17:39:30 -0700 | [diff] [blame] | 1041 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | |
| 1045 | |
| 1046 | /*-------------------------------------------------------------------------*/ |
| 1047 | |
| 1048 | /* |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1049 | * Used to take back a TD from the host controller. This would normally be |
| 1050 | * called from within dl_done_list, however it may be called directly if the |
| 1051 | * HC no longer sees the TD and it has not appeared on the donelist (after |
| 1052 | * two frames). This bug has been observed on ZF Micro systems. |
| 1053 | */ |
| 1054 | static void takeback_td(struct ohci_hcd *ohci, struct td *td) |
| 1055 | { |
| 1056 | struct urb *urb = td->urb; |
| 1057 | urb_priv_t *urb_priv = urb->hcpriv; |
| 1058 | struct ed *ed = td->ed; |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 1059 | int status; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1060 | |
| 1061 | /* update URB's length and status from TD */ |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 1062 | status = td_done(ohci, urb, td); |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1063 | urb_priv->td_cnt++; |
| 1064 | |
| 1065 | /* If all this urb's TDs are done, call complete() */ |
| 1066 | if (urb_priv->td_cnt == urb_priv->length) |
Alan Stern | 55d8496 | 2007-08-24 15:40:34 -0400 | [diff] [blame] | 1067 | finish_urb(ohci, urb, status); |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1068 | |
| 1069 | /* clean schedule: unlink EDs that are no longer busy */ |
| 1070 | if (list_empty(&ed->td_list)) { |
| 1071 | if (ed->state == ED_OPER) |
| 1072 | start_ed_unlink(ohci, ed); |
| 1073 | |
| 1074 | /* ... reenabling halted EDs only after fault cleanup */ |
| 1075 | } else if ((ed->hwINFO & cpu_to_hc32(ohci, ED_SKIP | ED_DEQUEUE)) |
| 1076 | == cpu_to_hc32(ohci, ED_SKIP)) { |
| 1077 | td = list_entry(ed->td_list.next, struct td, td_list); |
| 1078 | if (!(td->hwINFO & cpu_to_hc32(ohci, TD_DONE))) { |
| 1079 | ed->hwINFO &= ~cpu_to_hc32(ohci, ED_SKIP); |
| 1080 | /* ... hc may need waking-up */ |
| 1081 | switch (ed->type) { |
| 1082 | case PIPE_CONTROL: |
| 1083 | ohci_writel(ohci, OHCI_CLF, |
| 1084 | &ohci->regs->cmdstatus); |
| 1085 | break; |
| 1086 | case PIPE_BULK: |
| 1087 | ohci_writel(ohci, OHCI_BLF, |
| 1088 | &ohci->regs->cmdstatus); |
| 1089 | break; |
| 1090 | } |
| 1091 | } |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | * Process normal completions (error or success) and clean the schedules. |
| 1097 | * |
| 1098 | * This is the main path for handing urbs back to drivers. The only other |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1099 | * normal path is finish_unlinks(), which unlinks URBs using ed_rm_list, |
| 1100 | * instead of scanning the (re-reversed) donelist as this does. There's |
| 1101 | * an abnormal path too, handling a quirk in some Compaq silicon: URBs |
| 1102 | * with TDs that appear to be orphaned are directly reclaimed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | */ |
| 1104 | static void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1105 | dl_done_list (struct ohci_hcd *ohci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | { |
| 1107 | struct td *td = dl_reverse_done_list (ohci); |
| 1108 | |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1109 | while (td) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | struct td *td_next = td->next_dl_td; |
Mike Nuss | 89a0fd1 | 2007-08-01 13:24:30 -0700 | [diff] [blame] | 1111 | takeback_td(ohci, td); |
David Brownell | dd9048a | 2006-12-05 03:18:31 -0800 | [diff] [blame] | 1112 | td = td_next; |
| 1113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |